buildroot/toolchain/kernel-headers/lzma/linux-2.6.21.5-001-lzma-vmlinuz.00.patch

diff --git a/.miniconfig b/.miniconfig
new file mode 100644
index 0000000..5686e53
--- /dev/null
+++ b/.miniconfig
@@ -0,0 +1,89 @@
+#make allnoconfig KCONFIG_ALLCONFIG=miniconfig 
+CONFIG_X86_32=y
+CONFIG_CLOCKSOURCE_WATCHDOG=y
+CONFIG_LOCKDEP_SUPPORT=y
+CONFIG_SEMAPHORE_SLEEPERS=y
+CONFIG_MMU=y
+CONFIG_GENERIC_ISA_DMA=y
+CONFIG_GENERIC_HWEIGHT=y
+CONFIG_DMI=y
+CONFIG_INIT_ENV_ARG_LIMIT=32
+CONFIG_IKCONFIG=y
+CONFIG_IKCONFIG_PROC=y
+CONFIG_SYSFS_DEPRECATED=y
+CONFIG_BLK_DEV_INITRD=y
+CONFIG_SYSCTL=y
+CONFIG_EMBEDDED=y
+CONFIG_PRINTK=y
+CONFIG_BASE_SMALL=1
+CONFIG_BLOCK=y
+CONFIG_IOSCHED_NOOP=y
+CONFIG_DEFAULT_IOSCHED="noop"
+CONFIG_X86_GENERIC=y
+CONFIG_X86_L1_CACHE_SHIFT=7
+CONFIG_GENERIC_CALIBRATE_DELAY=y
+CONFIG_X86_WP_WORKS_OK=y
+CONFIG_X86_BSWAP=y
+CONFIG_X86_CMPXCHG64=y
+CONFIG_X86_INTEL_USERCOPY=y
+CONFIG_X86_TSC=y
+CONFIG_PREEMPT_NONE=y
+CONFIG_VM86=y
+CONFIG_HIGHMEM=y
+CONFIG_FLATMEM=y
+CONFIG_MTRR=y
+CONFIG_HZ_250=y
+CONFIG_PHYSICAL_ALIGN=0x100000
+CONFIG_ARCH_ENABLE_MEMORY_HOTPLUG=y
+CONFIG_PM=y
+CONFIG_ACPI=y
+CONFIG_ACPI_SLEEP=y
+CONFIG_ACPI_BLACKLIST_YEAR=0
+CONFIG_ACPI_EC=y
+CONFIG_ACPI_SYSTEM=y
+CONFIG_PCI=y
+CONFIG_PCI_GOANY=y
+CONFIG_PCI_DIRECT=y
+CONFIG_BINFMT_ELF=y
+CONFIG_STANDALONE=y
+CONFIG_BLK_DEV_LOOP=y
+CONFIG_IDE=y
+CONFIG_IDE_MAX_HWIFS=2
+CONFIG_BLK_DEV_IDE=y
+CONFIG_BLK_DEV_IDEDISK=y
+CONFIG_IDEDISK_MULTI_MODE=y
+CONFIG_BLK_DEV_IDECD=y
+CONFIG_IDE_GENERIC=y
+CONFIG_INPUT_MOUSEDEV=y
+CONFIG_INPUT_MOUSEDEV_SCREEN_X=1024
+CONFIG_INPUT_KEYBOARD=y
+CONFIG_KEYBOARD_ATKBD=y
+CONFIG_SERIO=y
+CONFIG_VT=y
+CONFIG_VT_CONSOLE=y
+CONFIG_UNIX98_PTYS=y
+CONFIG_VGA_CONSOLE=y
+CONFIG_USB_ARCH_HAS_HCD=y
+CONFIG_USB_ARCH_HAS_EHCI=y
+CONFIG_EXT2_FS=y
+CONFIG_DNOTIFY=y
+CONFIG_ISO9660_FS=y
+CONFIG_FAT_FS=y
+CONFIG_VFAT_FS=y
+CONFIG_FAT_DEFAULT_IOCHARSET="iso8859-1"
+CONFIG_PROC_FS=y
+CONFIG_PROC_SYSCTL=y
+CONFIG_SYSFS=y
+CONFIG_RAMFS=y
+CONFIG_SQUASHFS=y
+CONFIG_SQUASHFS_FRAGMENT_CACHE_SIZE=3
+CONFIG_MSDOS_PARTITION=y
+CONFIG_NLS_DEFAULT="iso8859-1"
+CONFIG_AUFS=y
+CONFIG_AUFS_FAKE_DM=y
+CONFIG_EARLY_PRINTK=y
+CONFIG_DOUBLEFAULT=y
+CONFIG_ZLIB_INFLATE=y
+CONFIG_HAS_IOPORT=y
+CONFIG_GENERIC_IRQ_PROBE=y
+CONFIG_KTIME_SCALAR=y
diff --git a/Makefile b/Makefile
index d970cb1..a369204 100644
--- a/Makefile
+++ b/Makefile
@@ -188,7 +188,7 @@ CROSS_COMPILE	?=
 # Architecture as present in compile.h
 UTS_MACHINE := $(ARCH)
 
-KCONFIG_CONFIG	?= .config
+KCONFIG_CONFIG	?= .miniconfig
 
 # SHELL used by kbuild
 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
diff --git a/arch/i386/boot/compressed/LzmaDecode.c b/arch/i386/boot/compressed/LzmaDecode.c
new file mode 100644
index 0000000..21bf40b
--- /dev/null
+++ b/arch/i386/boot/compressed/LzmaDecode.c
@@ -0,0 +1,588 @@
+/*
+  LzmaDecode.c
+  LZMA Decoder (optimized for Speed version)
+  
+  LZMA SDK 4.22 Copyright (c) 1999-2005 Igor Pavlov (2005-06-10)
+  http://www.7-zip.org/
+
+  LZMA SDK is licensed under two licenses:
+  1) GNU Lesser General Public License (GNU LGPL)
+  2) Common Public License (CPL)
+  It means that you can select one of these two licenses and 
+  follow rules of that license.
+
+  SPECIAL EXCEPTION:
+  Igor Pavlov, as the author of this Code, expressly permits you to 
+  statically or dynamically link your Code (or bind by name) to the 
+  interfaces of this file without subjecting your linked Code to the 
+  terms of the CPL or GNU LGPL. Any modifications or additions 
+  to this file, however, are subject to the LGPL or CPL terms.
+*/
+
+#include "LzmaDecode.h"
+
+#ifndef Byte
+#define Byte unsigned char
+#endif
+
+#define kNumTopBits 24
+#define kTopValue ((UInt32)1 << kNumTopBits)
+
+#define kNumBitModelTotalBits 11
+#define kBitModelTotal (1 << kNumBitModelTotalBits)
+#define kNumMoveBits 5
+
+#define RC_READ_BYTE (*Buffer++)
+
+#define RC_INIT2 Code = 0; Range = 0xFFFFFFFF; \
+  { int i; for(i = 0; i < 5; i++) { RC_TEST; Code = (Code << 8) | RC_READ_BYTE; }}
+
+#ifdef _LZMA_IN_CB
+
+#define RC_TEST { if (Buffer == BufferLim) \
+  { SizeT size; int result = InCallback->Read(InCallback, &Buffer, &size); if (result != LZMA_RESULT_OK) return result; \
+  BufferLim = Buffer + size; if (size == 0) return LZMA_RESULT_DATA_ERROR; }}
+
+#define RC_INIT Buffer = BufferLim = 0; RC_INIT2
+
+#else
+
+#define RC_TEST { if (Buffer == BufferLim) return LZMA_RESULT_DATA_ERROR; }
+
+#define RC_INIT(buffer, bufferSize) Buffer = buffer; BufferLim = buffer + bufferSize; RC_INIT2
+ 
+#endif
+
+#define RC_NORMALIZE if (Range < kTopValue) { RC_TEST; Range <<= 8; Code = (Code << 8) | RC_READ_BYTE; }
+
+#define IfBit0(p) RC_NORMALIZE; bound = (Range >> kNumBitModelTotalBits) * *(p); if (Code < bound)
+#define UpdateBit0(p) Range = bound; *(p) += (kBitModelTotal - *(p)) >> kNumMoveBits;
+#define UpdateBit1(p) Range -= bound; Code -= bound; *(p) -= (*(p)) >> kNumMoveBits;
+
+#define RC_GET_BIT2(p, mi, A0, A1) IfBit0(p) \
+  { UpdateBit0(p); mi <<= 1; A0; } else \
+  { UpdateBit1(p); mi = (mi + mi) + 1; A1; } 
+  
+#define RC_GET_BIT(p, mi) RC_GET_BIT2(p, mi, ; , ;)               
+
+#define RangeDecoderBitTreeDecode(probs, numLevels, res) \
+  { int i = numLevels; res = 1; \
+  do { CProb *p = probs + res; RC_GET_BIT(p, res) } while(--i != 0); \
+  res -= (1 << numLevels); }
+
+
+#define kNumPosBitsMax 4
+#define kNumPosStatesMax (1 << kNumPosBitsMax)
+
+#define kLenNumLowBits 3
+#define kLenNumLowSymbols (1 << kLenNumLowBits)
+#define kLenNumMidBits 3
+#define kLenNumMidSymbols (1 << kLenNumMidBits)
+#define kLenNumHighBits 8
+#define kLenNumHighSymbols (1 << kLenNumHighBits)
+
+#define LenChoice 0
+#define LenChoice2 (LenChoice + 1)
+#define LenLow (LenChoice2 + 1)
+#define LenMid (LenLow + (kNumPosStatesMax << kLenNumLowBits))
+#define LenHigh (LenMid + (kNumPosStatesMax << kLenNumMidBits))
+#define kNumLenProbs (LenHigh + kLenNumHighSymbols) 
+
+
+#define kNumStates 12
+#define kNumLitStates 7
+
+#define kStartPosModelIndex 4
+#define kEndPosModelIndex 14
+#define kNumFullDistances (1 << (kEndPosModelIndex >> 1))
+
+#define kNumPosSlotBits 6
+#define kNumLenToPosStates 4
+
+#define kNumAlignBits 4
+#define kAlignTableSize (1 << kNumAlignBits)
+
+#define kMatchMinLen 2
+
+#define IsMatch 0
+#define IsRep (IsMatch + (kNumStates << kNumPosBitsMax))
+#define IsRepG0 (IsRep + kNumStates)
+#define IsRepG1 (IsRepG0 + kNumStates)
+#define IsRepG2 (IsRepG1 + kNumStates)
+#define IsRep0Long (IsRepG2 + kNumStates)
+#define PosSlot (IsRep0Long + (kNumStates << kNumPosBitsMax))
+#define SpecPos (PosSlot + (kNumLenToPosStates << kNumPosSlotBits))
+#define Align (SpecPos + kNumFullDistances - kEndPosModelIndex)
+#define LenCoder (Align + kAlignTableSize)
+#define RepLenCoder (LenCoder + kNumLenProbs)
+#define Literal (RepLenCoder + kNumLenProbs)
+
+#if Literal != LZMA_BASE_SIZE
+StopCompilingDueBUG
+#endif
+
+int LzmaDecodeProperties(CLzmaProperties *propsRes, const unsigned char *propsData, int size)
+{
+  unsigned char prop0;
+  if (size < LZMA_PROPERTIES_SIZE)
+    return LZMA_RESULT_DATA_ERROR;
+  prop0 = propsData[0];
+  if (prop0 >= (9 * 5 * 5))
+    return LZMA_RESULT_DATA_ERROR;
+  {
+    for (propsRes->pb = 0; prop0 >= (9 * 5); propsRes->pb++, prop0 -= (9 * 5));
+    for (propsRes->lp = 0; prop0 >= 9; propsRes->lp++, prop0 -= 9);
+    propsRes->lc = prop0;
+    /*
+    unsigned char remainder = (unsigned char)(prop0 / 9);
+    propsRes->lc = prop0 % 9;
+    propsRes->pb = remainder / 5;
+    propsRes->lp = remainder % 5;
+    */
+  }
+
+  #ifdef _LZMA_OUT_READ
+  {
+    int i;
+    propsRes->DictionarySize = 0;
+    for (i = 0; i < 4; i++)
+      propsRes->DictionarySize += (UInt32)(propsData[1 + i]) << (i * 8);
+    if (propsRes->DictionarySize == 0)
+      propsRes->DictionarySize = 1;
+  }
+  #endif
+  return LZMA_RESULT_OK;
+}
+
+#define kLzmaStreamWasFinishedId (-1)
+
+int LzmaDecode(CLzmaDecoderState *vs,
+    #ifdef _LZMA_IN_CB
+    ILzmaInCallback *InCallback,
+    #else
+    const unsigned char *inStream, SizeT inSize, SizeT *inSizeProcessed,
+    #endif
+    unsigned char *outStream, SizeT outSize, SizeT *outSizeProcessed)
+{
+  CProb *p = vs->Probs;
+  SizeT nowPos = 0;
+  Byte previousByte = 0;
+  UInt32 posStateMask = (1 << (vs->Properties.pb)) - 1;
+  UInt32 literalPosMask = (1 << (vs->Properties.lp)) - 1;
+  int lc = vs->Properties.lc;
+
+  #ifdef _LZMA_OUT_READ
+  
+  UInt32 Range = vs->Range;
+  UInt32 Code = vs->Code;
+  #ifdef _LZMA_IN_CB
+  const Byte *Buffer = vs->Buffer;
+  const Byte *BufferLim = vs->BufferLim;
+  #else
+  const Byte *Buffer = inStream;
+  const Byte *BufferLim = inStream + inSize;
+  #endif
+  int state = vs->State;
+  UInt32 rep0 = vs->Reps[0], rep1 = vs->Reps[1], rep2 = vs->Reps[2], rep3 = vs->Reps[3];
+  int len = vs->RemainLen;
+  UInt32 globalPos = vs->GlobalPos;
+  UInt32 distanceLimit = vs->DistanceLimit;
+
+  Byte *dictionary = vs->Dictionary;
+  UInt32 dictionarySize = vs->Properties.DictionarySize;
+  UInt32 dictionaryPos = vs->DictionaryPos;
+
+  Byte tempDictionary[4];
+
+  #ifndef _LZMA_IN_CB
+  *inSizeProcessed = 0;
+  #endif
+  *outSizeProcessed = 0;
+  if (len == kLzmaStreamWasFinishedId)
+    return LZMA_RESULT_OK;
+
+  if (dictionarySize == 0)
+  {
+    dictionary = tempDictionary;
+    dictionarySize = 1;
+    tempDictionary[0] = vs->TempDictionary[0];
+  }
+
+  if (len == kLzmaNeedInitId)
+  {
+    {
+      UInt32 numProbs = Literal + ((UInt32)LZMA_LIT_SIZE << (lc + vs->Properties.lp));
+      UInt32 i;
+      for (i = 0; i < numProbs; i++)
+        p[i] = kBitModelTotal >> 1; 
+      rep0 = rep1 = rep2 = rep3 = 1;
+      state = 0;
+      globalPos = 0;
+      distanceLimit = 0;
+      dictionaryPos = 0;
+      dictionary[dictionarySize - 1] = 0;
+      #ifdef _LZMA_IN_CB
+      RC_INIT;
+      #else
+      RC_INIT(inStream, inSize);
+      #endif
+    }
+    len = 0;
+  }
+  while(len != 0 && nowPos < outSize)
+  {
+    UInt32 pos = dictionaryPos - rep0;
+    if (pos >= dictionarySize)
+      pos += dictionarySize;
+    outStream[nowPos++] = dictionary[dictionaryPos] = dictionary[pos];
+    if (++dictionaryPos == dictionarySize)
+      dictionaryPos = 0;
+    len--;
+  }
+  if (dictionaryPos == 0)
+    previousByte = dictionary[dictionarySize - 1];
+  else
+    previousByte = dictionary[dictionaryPos - 1];
+
+  #else /* if !_LZMA_OUT_READ */
+
+  int state = 0;
+  UInt32 rep0 = 1, rep1 = 1, rep2 = 1, rep3 = 1;
+  int len = 0;
+  const Byte *Buffer;
+  const Byte *BufferLim;
+  UInt32 Range;
+  UInt32 Code;
+
+  #ifndef _LZMA_IN_CB
+  *inSizeProcessed = 0;
+  #endif
+  *outSizeProcessed = 0;
+
+  {
+    UInt32 i;
+    UInt32 numProbs = Literal + ((UInt32)LZMA_LIT_SIZE << (lc + vs->Properties.lp));
+    for (i = 0; i < numProbs; i++)
+      p[i] = kBitModelTotal >> 1;
+  }
+  
+  #ifdef _LZMA_IN_CB
+  RC_INIT;
+  #else
+  RC_INIT(inStream, inSize);
+  #endif
+
+  #endif /* _LZMA_OUT_READ */
+
+  while(nowPos < outSize)
+  {
+    CProb *prob;
+    UInt32 bound;
+    int posState = (int)(
+        (nowPos 
+        #ifdef _LZMA_OUT_READ
+        + globalPos
+        #endif
+        )
+        & posStateMask);
+
+    prob = p + IsMatch + (state << kNumPosBitsMax) + posState;
+    IfBit0(prob)
+    {
+      int symbol = 1;
+      UpdateBit0(prob)
+      prob = p + Literal + (LZMA_LIT_SIZE * 
+        (((
+        (nowPos 
+        #ifdef _LZMA_OUT_READ
+        + globalPos
+        #endif
+        )
+        & literalPosMask) << lc) + (previousByte >> (8 - lc))));
+
+      if (state >= kNumLitStates)
+      {
+        int matchByte;
+        #ifdef _LZMA_OUT_READ
+        UInt32 pos = dictionaryPos - rep0;
+        if (pos >= dictionarySize)
+          pos += dictionarySize;
+        matchByte = dictionary[pos];
+        #else
+        matchByte = outStream[nowPos - rep0];
+        #endif
+        do
+        {
+          int bit;
+          CProb *probLit;
+          matchByte <<= 1;
+          bit = (matchByte & 0x100);
+          probLit = prob + 0x100 + bit + symbol;
+          RC_GET_BIT2(probLit, symbol, if (bit != 0) break, if (bit == 0) break)
+        }
+        while (symbol < 0x100);
+      }
+      while (symbol < 0x100)
+      {
+        CProb *probLit = prob + symbol;
+        RC_GET_BIT(probLit, symbol)
+      }
+      previousByte = (Byte)symbol;
+
+      outStream[nowPos++] = previousByte;
+      #ifdef _LZMA_OUT_READ
+      if (distanceLimit < dictionarySize)
+        distanceLimit++;
+
+      dictionary[dictionaryPos] = previousByte;
+      if (++dictionaryPos == dictionarySize)
+        dictionaryPos = 0;
+      #endif
+      if (state < 4) state = 0;
+      else if (state < 10) state -= 3;
+      else state -= 6;
+    }
+    else             
+    {
+      UpdateBit1(prob);
+      prob = p + IsRep + state;
+      IfBit0(prob)
+      {
+        UpdateBit0(prob);
+        rep3 = rep2;
+        rep2 = rep1;
+        rep1 = rep0;
+        state = state < kNumLitStates ? 0 : 3;
+        prob = p + LenCoder;
+      }
+      else
+      {
+        UpdateBit1(prob);
+        prob = p + IsRepG0 + state;
+        IfBit0(prob)
+        {
+          UpdateBit0(prob);
+          prob = p + IsRep0Long + (state << kNumPosBitsMax) + posState;
+          IfBit0(prob)
+          {
+            #ifdef _LZMA_OUT_READ
+            UInt32 pos;
+            #endif
+            UpdateBit0(prob);
+            
+            #ifdef _LZMA_OUT_READ
+            if (distanceLimit == 0)
+            #else
+            if (nowPos == 0)
+            #endif
+              return LZMA_RESULT_DATA_ERROR;
+            
+            state = state < kNumLitStates ? 9 : 11;
+            #ifdef _LZMA_OUT_READ
+            pos = dictionaryPos - rep0;
+            if (pos >= dictionarySize)
+              pos += dictionarySize;
+            previousByte = dictionary[pos];
+            dictionary[dictionaryPos] = previousByte;
+            if (++dictionaryPos == dictionarySize)
+              dictionaryPos = 0;
+            #else
+            previousByte = outStream[nowPos - rep0];
+            #endif
+            outStream[nowPos++] = previousByte;
+            #ifdef _LZMA_OUT_READ
+            if (distanceLimit < dictionarySize)
+              distanceLimit++;
+            #endif
+
+            continue;
+          }
+          else
+          {
+            UpdateBit1(prob);
+          }
+        }
+        else
+        {
+          UInt32 distance;
+          UpdateBit1(prob);
+          prob = p + IsRepG1 + state;
+          IfBit0(prob)
+          {
+            UpdateBit0(prob);
+            distance = rep1;
+          }
+          else 
+          {
+            UpdateBit1(prob);
+            prob = p + IsRepG2 + state;
+            IfBit0(prob)
+            {
+              UpdateBit0(prob);
+              distance = rep2;
+            }
+            else
+            {
+              UpdateBit1(prob);
+              distance = rep3;
+              rep3 = rep2;
+            }
+            rep2 = rep1;
+          }
+          rep1 = rep0;
+          rep0 = distance;
+        }
+        state = state < kNumLitStates ? 8 : 11;
+        prob = p + RepLenCoder;
+      }
+      {
+        int numBits, offset;
+        CProb *probLen = prob + LenChoice;
+        IfBit0(probLen)
+        {
+          UpdateBit0(probLen);
+          probLen = prob + LenLow + (posState << kLenNumLowBits);
+          offset = 0;
+          numBits = kLenNumLowBits;
+        }
+        else
+        {
+          UpdateBit1(probLen);
+          probLen = prob + LenChoice2;
+          IfBit0(probLen)
+          {
+            UpdateBit0(probLen);
+            probLen = prob + LenMid + (posState << kLenNumMidBits);
+            offset = kLenNumLowSymbols;
+            numBits = kLenNumMidBits;
+          }
+          else
+          {
+            UpdateBit1(probLen);
+            probLen = prob + LenHigh;
+            offset = kLenNumLowSymbols + kLenNumMidSymbols;
+            numBits = kLenNumHighBits;
+          }
+        }
+        RangeDecoderBitTreeDecode(probLen, numBits, len);
+        len += offset;
+      }
+
+      if (state < 4)
+      {
+        int posSlot;
+        state += kNumLitStates;
+        prob = p + PosSlot +
+            ((len < kNumLenToPosStates ? len : kNumLenToPosStates - 1) << 
+            kNumPosSlotBits);
+        RangeDecoderBitTreeDecode(prob, kNumPosSlotBits, posSlot);
+        if (posSlot >= kStartPosModelIndex)
+        {
+          int numDirectBits = ((posSlot >> 1) - 1);
+          rep0 = (2 | ((UInt32)posSlot & 1));
+          if (posSlot < kEndPosModelIndex)
+          {
+            rep0 <<= numDirectBits;
+            prob = p + SpecPos + rep0 - posSlot - 1;
+          }
+          else
+          {
+            numDirectBits -= kNumAlignBits;
+            do
+            {
+              RC_NORMALIZE
+              Range >>= 1;
+              rep0 <<= 1;
+              if (Code >= Range)
+              {
+                Code -= Range;
+                rep0 |= 1;
+              }
+            }
+            while (--numDirectBits != 0);
+            prob = p + Align;
+            rep0 <<= kNumAlignBits;
+            numDirectBits = kNumAlignBits;
+          }
+          {
+            int i = 1;
+            int mi = 1;
+            do
+            {
+              CProb *prob3 = prob + mi;
+              RC_GET_BIT2(prob3, mi, ; , rep0 |= i);
+              i <<= 1;
+            }
+            while(--numDirectBits != 0);
+          }
+        }
+        else
+          rep0 = posSlot;
+        if (++rep0 == (UInt32)(0))
+        {
+          /* it's for stream version */
+          len = kLzmaStreamWasFinishedId;
+          break;
+        }
+      }
+
+      len += kMatchMinLen;
+      #ifdef _LZMA_OUT_READ
+      if (rep0 > distanceLimit) 
+      #else
+      if (rep0 > nowPos)
+      #endif
+        return LZMA_RESULT_DATA_ERROR;
+
+      #ifdef _LZMA_OUT_READ
+      if (dictionarySize - distanceLimit > (UInt32)len)
+        distanceLimit += len;
+      else
+        distanceLimit = dictionarySize;
+      #endif
+
+      do
+      {
+        #ifdef _LZMA_OUT_READ
+        UInt32 pos = dictionaryPos - rep0;
+        if (pos >= dictionarySize)
+          pos += dictionarySize;
+        previousByte = dictionary[pos];
+        dictionary[dictionaryPos] = previousByte;
+        if (++dictionaryPos == dictionarySize)
+          dictionaryPos = 0;
+        #else
+        previousByte = outStream[nowPos - rep0];
+        #endif
+        len--;
+        outStream[nowPos++] = previousByte;
+      }
+      while(len != 0 && nowPos < outSize);
+    }
+  }
+  RC_NORMALIZE;
+
+  #ifdef _LZMA_OUT_READ
+  vs->Range = Range;
+  vs->Code = Code;
+  vs->DictionaryPos = dictionaryPos;
+  vs->GlobalPos = globalPos + (UInt32)nowPos;
+  vs->DistanceLimit = distanceLimit;
+  vs->Reps[0] = rep0;
+  vs->Reps[1] = rep1;
+  vs->Reps[2] = rep2;
+  vs->Reps[3] = rep3;
+  vs->State = state;
+  vs->RemainLen = len;
+  vs->TempDictionary[0] = tempDictionary[0];
+  #endif
+
+  #ifdef _LZMA_IN_CB
+  vs->Buffer = Buffer;
+  vs->BufferLim = BufferLim;
+  #else
+  *inSizeProcessed = (SizeT)(Buffer - inStream);
+  #endif
+  *outSizeProcessed = nowPos;
+  return LZMA_RESULT_OK;
+}
diff --git a/arch/i386/boot/compressed/LzmaDecode.h b/arch/i386/boot/compressed/LzmaDecode.h
new file mode 100644
index 0000000..213062a
--- /dev/null
+++ b/arch/i386/boot/compressed/LzmaDecode.h
@@ -0,0 +1,131 @@
+/* 
+  LzmaDecode.h
+  LZMA Decoder interface
+
+  LZMA SDK 4.21 Copyright (c) 1999-2005 Igor Pavlov (2005-06-08)
+  http://www.7-zip.org/
+
+  LZMA SDK is licensed under two licenses:
+  1) GNU Lesser General Public License (GNU LGPL)
+  2) Common Public License (CPL)
+  It means that you can select one of these two licenses and 
+  follow rules of that license.
+
+  SPECIAL EXCEPTION:
+  Igor Pavlov, as the author of this code, expressly permits you to 
+  statically or dynamically link your code (or bind by name) to the 
+  interfaces of this file without subjecting your linked code to the 
+  terms of the CPL or GNU LGPL. Any modifications or additions 
+  to this file, however, are subject to the LGPL or CPL terms.
+*/
+
+#ifndef __LZMADECODE_H
+#define __LZMADECODE_H
+
+/* #define _LZMA_IN_CB */
+/* Use callback for input data */
+
+/* #define _LZMA_OUT_READ */
+/* Use read function for output data */
+
+/* #define _LZMA_PROB32 */
+/* It can increase speed on some 32-bit CPUs, 
+   but memory usage will be doubled in that case */
+
+/* #define _LZMA_LOC_OPT */
+/* Enable local speed optimizations inside code */
+
+/* #define _LZMA_SYSTEM_SIZE_T */
+/* Use system's size_t. You can use it to enable 64-bit sizes supporting*/
+
+#ifndef UInt32
+#ifdef _LZMA_UINT32_IS_ULONG
+#define UInt32 unsigned long
+#else
+#define UInt32 unsigned int
+#endif
+#endif
+
+#ifndef SizeT
+#ifdef _LZMA_SYSTEM_SIZE_T
+#include <stddef.h>
+#define SizeT size_t
+#else
+#define SizeT UInt32
+#endif
+#endif
+
+#ifdef _LZMA_PROB32
+#define CProb UInt32
+#else
+#define CProb unsigned short
+#endif
+
+#define LZMA_RESULT_OK 0
+#define LZMA_RESULT_DATA_ERROR 1
+
+#ifdef _LZMA_IN_CB
+typedef struct _ILzmaInCallback
+{
+  int (*Read)(void *object, const unsigned char **buffer, SizeT *bufferSize);
+} ILzmaInCallback;
+#endif
+
+#define LZMA_BASE_SIZE 1846
+#define LZMA_LIT_SIZE 768
+
+#define LZMA_PROPERTIES_SIZE 5
+
+typedef struct _CLzmaProperties
+{
+  int lc;
+  int lp;
+  int pb;
+  #ifdef _LZMA_OUT_READ
+  UInt32 DictionarySize;
+  #endif
+}CLzmaProperties;
+
+int LzmaDecodeProperties(CLzmaProperties *propsRes, const unsigned char *propsData, int size);
+
+#define LzmaGetNumProbs(Properties) (LZMA_BASE_SIZE + (LZMA_LIT_SIZE << ((Properties)->lc + (Properties)->lp)))
+
+#define kLzmaNeedInitId (-2)
+
+typedef struct _CLzmaDecoderState
+{
+  CLzmaProperties Properties;
+  CProb *Probs;
+
+  #ifdef _LZMA_IN_CB
+  const unsigned char *Buffer;
+  const unsigned char *BufferLim;
+  #endif
+
+  #ifdef _LZMA_OUT_READ
+  unsigned char *Dictionary;
+  UInt32 Range;
+  UInt32 Code;
+  UInt32 DictionaryPos;
+  UInt32 GlobalPos;
+  UInt32 DistanceLimit;
+  UInt32 Reps[4];
+  int State;
+  int RemainLen;
+  unsigned char TempDictionary[4];
+  #endif
+} CLzmaDecoderState;
+
+#ifdef _LZMA_OUT_READ
+#define LzmaDecoderInit(vs) { (vs)->RemainLen = kLzmaNeedInitId; }
+#endif
+
+int LzmaDecode(CLzmaDecoderState *vs,
+    #ifdef _LZMA_IN_CB
+    ILzmaInCallback *inCallback,
+    #else
+    const unsigned char *inStream, SizeT inSize, SizeT *inSizeProcessed,
+    #endif
+    unsigned char *outStream, SizeT outSize, SizeT *outSizeProcessed);
+
+#endif
diff --git a/arch/i386/boot/compressed/Makefile b/arch/i386/boot/compressed/Makefile
index a661217..fb40869 100644
--- a/arch/i386/boot/compressed/Makefile
+++ b/arch/i386/boot/compressed/Makefile
@@ -4,15 +4,16 @@
 # create a compressed vmlinux image from the original vmlinux
 #
 
-targets		:= vmlinux vmlinux.bin vmlinux.bin.gz head.o misc.o piggy.o \
-			vmlinux.bin.all vmlinux.relocs
+tragets		:= head.o lzma_misc.o piggy.o \
+			vmlinux.bin.all vmlinux.relocs \
+			vmlinux vmlinux.bin vmlinux.bin.gz
 EXTRA_AFLAGS	:= -traditional
 
 LDFLAGS_vmlinux := -T
-CFLAGS_misc.o += -fPIC
+CFLAGS_lzma_misc.o += -fPIC
 hostprogs-y	:= relocs
 
-$(obj)/vmlinux: $(src)/vmlinux.lds $(obj)/head.o $(obj)/misc.o $(obj)/piggy.o FORCE
+$(obj)/vmlinux: $(src)/vmlinux.lds $(obj)/head.o $(obj)/lzma_misc.o $(obj)/piggy.o FORCE
 	$(call if_changed,ld)
 	@:
 
@@ -33,10 +34,10 @@ $(obj)/vmlinux.bin.all: $(vmlinux.bin.all-y) FORCE
 
 ifdef CONFIG_RELOCATABLE
 $(obj)/vmlinux.bin.gz: $(obj)/vmlinux.bin.all FORCE
-	$(call if_changed,gzip)
+	$(call if_changed,lzma)
 else
 $(obj)/vmlinux.bin.gz: $(obj)/vmlinux.bin FORCE
-	$(call if_changed,gzip)
+	$(call if_changed,lzma)
 endif
 
 LDFLAGS_piggy.o := -r --format binary --oformat elf32-i386 -T
diff --git a/arch/i386/boot/compressed/lzma_misc.c b/arch/i386/boot/compressed/lzma_misc.c
new file mode 100644
index 0000000..4f5f7f9
--- /dev/null
+++ b/arch/i386/boot/compressed/lzma_misc.c
@@ -0,0 +1,290 @@
+/*
+ * lzma_misc.c
+ * 
+ * Decompress LZMA compressed vmlinuz
+ * Version 0.9 Copyright (c) Ming-Ching Tiew mctiew@yahoo.com
+ * Program adapted from misc.c for 2.6.20.1 kernel
+ * Please refer to misc.c for authorship and copyright.
+ * Date: 25 March 2007
+ * Source released under GPL
+ */
+
+#undef CONFIG_PARAVIRT
+#include <linux/linkage.h>
+#include <linux/vmalloc.h>
+#include <linux/screen_info.h>
+#include <asm/io.h>
+#include <asm/page.h>
+#include <asm/boot.h>
+
+/* WARNING!!
+ * This code is compiled with -fPIC and it is relocated dynamically
+ * at run time, but no relocation processing is performed.
+ * This means that it is not safe to place pointers in static structures.
+ */
+
+#define OF(args)  args
+#define STATIC static
+
+#undef memset
+#undef memcpy
+
+typedef unsigned char  uch;
+typedef unsigned short ush;
+typedef unsigned long  ulg;
+
+#define WSIZE 0x80000000	/* Window size must be at least 32k,
+				 * and a power of two
+				 * We don't actually have a window just
+				 * a huge output buffer so I report
+				 * a 2G windows size, as that should
+				 * always be larger than our output buffer.
+				 */
+
+static uch *inbuf;	/* input buffer */
+static uch *window;	/* Sliding window buffer, (and final output buffer) */
+
+static unsigned insize;  /* valid bytes in inbuf */
+static unsigned inptr;   /* index of next byte to be processed in inbuf */
+
+/* gzip flag byte */
+#define ASCII_FLAG   0x01 /* bit 0 set: file probably ASCII text */
+#define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */
+#define EXTRA_FIELD  0x04 /* bit 2 set: extra field present */
+#define ORIG_NAME    0x08 /* bit 3 set: original file name present */
+#define COMMENT      0x10 /* bit 4 set: file comment present */
+#define ENCRYPTED    0x20 /* bit 5 set: file is encrypted */
+#define RESERVED     0xC0 /* bit 6,7:   reserved */
+
+#define get_byte()  (inptr < insize ? inbuf[inptr++] : fill_inbuf())
+		
+/* Diagnostic functions */
+#ifdef DEBUG
+#  define Assert(cond,msg) {if(!(cond)) error(msg);}
+#  define Trace(x) fprintf x
+#  define Tracev(x) {if (verbose) fprintf x ;}
+#  define Tracevv(x) {if (verbose>1) fprintf x ;}
+#  define Tracec(c,x) {if (verbose && (c)) fprintf x ;}
+#  define Tracecv(c,x) {if (verbose>1 && (c)) fprintf x ;}
+#else
+#  define Assert(cond,msg)
+#  define Trace(x)
+#  define Tracev(x)
+#  define Tracevv(x)
+#  define Tracec(c,x)
+#  define Tracecv(c,x)
+#endif
+
+static int  fill_inbuf(void);
+static void error(char *m);
+  
+/*
+ * This is set up by the setup-routine at boot-time
+ */
+static unsigned char *real_mode; /* Pointer to real-mode data */
+
+#define RM_EXT_MEM_K   (*(unsigned short *)(real_mode + 0x2))
+#ifndef STANDARD_MEMORY_BIOS_CALL
+#define RM_ALT_MEM_K   (*(unsigned long *)(real_mode + 0x1e0))
+#endif
+#define RM_SCREEN_INFO (*(struct screen_info *)(real_mode+0))
+
+extern unsigned char input_data[];
+extern int input_len;
+
+static long bytes_out = 0;
+
+static void *memcpy(void *dest, const void *src, unsigned n);
+
+static void putstr(const char *);
+
+static unsigned long free_mem_ptr;
+static unsigned long free_mem_end_ptr;
+
+#define HEAP_SIZE             0x3000
+
+static char *vidmem = (char *)0xb8000;
+static int vidport;
+static int lines, cols;
+
+#ifdef CONFIG_X86_NUMAQ
+void *xquad_portio;
+#endif
+
+static void scroll(void)
+{
+	int i;
+
+	memcpy ( vidmem, vidmem + cols * 2, ( lines - 1 ) * cols * 2 );
+	for ( i = ( lines - 1 ) * cols * 2; i < lines * cols * 2; i += 2 )
+		vidmem[i] = ' ';
+}
+
+static void putstr(const char *s)
+{
+	int x,y,pos;
+	char c;
+
+	x = RM_SCREEN_INFO.orig_x;
+	y = RM_SCREEN_INFO.orig_y;
+
+	while ( ( c = *s++ ) != '\0' ) {
+		if ( c == '\n' ) {
+			x = 0;
+			if ( ++y >= lines ) {
+				scroll();
+				y--;
+			}
+		} else {
+			vidmem [ ( x + cols * y ) * 2 ] = c;
+			if ( ++x >= cols ) {
+				x = 0;
+				if ( ++y >= lines ) {
+					scroll();
+					y--;
+				}
+			}
+		}
+	}
+
+	RM_SCREEN_INFO.orig_x = x;
+	RM_SCREEN_INFO.orig_y = y;
+
+	pos = (x + cols * y) * 2;	/* Update cursor position */
+	outb_p(14, vidport);
+	outb_p(0xff & (pos >> 9), vidport+1);
+	outb_p(15, vidport);
+	outb_p(0xff & (pos >> 1), vidport+1);
+}
+
+static void* memcpy(void* dest, const void* src, unsigned n)
+{
+	int i;
+	char *d = (char *)dest, *s = (char *)src;
+
+	for (i=0;i<n;i++) d[i] = s[i];
+	return dest;
+}
+
+/* ===========================================================================
+ * Fill the input buffer. This is called only when the buffer is empty
+ * and at least one byte is really needed.
+ */
+static int fill_inbuf(void)
+{
+	error("ran out of input data");
+	return 0;
+}
+
+/* ===========================================================================
+ */
+static void error(char *x)
+{
+	putstr("\n\n");
+	putstr(x);
+	putstr("\n\n -- System halted");
+
+	while(1);	/* Halt */
+}
+
+#define _LZMA_IN_CB
+#include "LzmaDecode.h"
+#include "LzmaDecode.c"
+
+static int read_byte(void *object, const unsigned char **buffer, SizeT *bufferSize);
+
+/*
+ * Do the lzma decompression
+ */
+static int lzma_unzip(uch* output)
+{
+
+	unsigned int i;
+        CLzmaDecoderState state;
+	unsigned int uncompressedSize = 0;
+	unsigned char* p;
+        
+        ILzmaInCallback callback;
+        callback.Read = read_byte;
+
+	// lzma args
+	i = get_byte();
+	state.Properties.lc = i % 9, i = i / 9;
+        state.Properties.lp = i % 5, state.Properties.pb = i / 5;
+        
+        // skip dictionary size
+        for (i = 0; i < 4; i++) 
+        	get_byte();
+        // get uncompressed size
+        p= (char*)&uncompressedSize;	
+        for (i = 0; i < 4; i++) 
+            *p++ = get_byte();
+            
+        // skip high order bytes
+        for (i = 0; i < 4; i++) 
+        	get_byte();
+
+	// Just point it beyond
+        state.Probs = (CProb*) ( free_mem_ptr );
+	// decompress kernel
+	if (LzmaDecode( &state, &callback,
+	   (unsigned char*)output, uncompressedSize, &i) == LZMA_RESULT_OK)
+	{
+		if ( i != uncompressedSize )
+		   error( "kernel corrupted!\n");
+		bytes_out = i;
+		return 0;
+	}
+	return 1;
+}
+
+
+static int read_byte(void *object, const unsigned char **buffer, SizeT *bufferSize)
+{
+	static unsigned int i = 0;
+	static unsigned char val;
+	*bufferSize = 1;
+	val = get_byte();
+	*buffer = &val;
+	return LZMA_RESULT_OK;
+}	
+
+asmlinkage void decompress_kernel(void *rmode, unsigned long end,
+			uch *input_data, unsigned long input_len, uch *output)
+{
+	real_mode = rmode;
+
+	if (RM_SCREEN_INFO.orig_video_mode == 7) {
+		vidmem = (char *) 0xb0000;
+		vidport = 0x3b4;
+	} else {
+		vidmem = (char *) 0xb8000;
+		vidport = 0x3d4;
+	}
+
+	lines = RM_SCREEN_INFO.orig_video_lines;
+	cols = RM_SCREEN_INFO.orig_video_cols;
+
+	window = output;  	/* Output buffer (Normally at 1M) */
+	free_mem_ptr     = end;	/* Heap  */
+	free_mem_end_ptr = end + HEAP_SIZE;
+	inbuf  = input_data;	/* Input buffer */
+	insize = input_len;
+	inptr  = 0;
+
+	if ((u32)output & (CONFIG_PHYSICAL_ALIGN -1))
+		error("Destination address not CONFIG_PHYSICAL_ALIGN aligned");
+	if (end > ((-__PAGE_OFFSET-(512 <<20)-1) & 0x7fffffff))
+		error("Destination address too large");
+#ifndef CONFIG_RELOCATABLE
+	if ((u32)output != LOAD_PHYSICAL_ADDR)
+		error("Wrong destination address");
+#endif
+        if( lzma_unzip(output) != 0 )
+        {
+           error("inflate error\n");
+        }
+        putstr("Ok, booting the kernel.\n");
+
+	return;
+}
diff --git a/arch/i386/boot/compressed/vmlinux.scr b/arch/i386/boot/compressed/vmlinux.scr
index 707a88f..9d67263 100644
--- a/arch/i386/boot/compressed/vmlinux.scr
+++ b/arch/i386/boot/compressed/vmlinux.scr
@@ -3,8 +3,8 @@ SECTIONS
   .data.compressed : {
 	input_len = .;
 	LONG(input_data_end - input_data) input_data = .; 
+	output_len = . + 5;
 	*(.data) 
-	output_len = . - 4;
 	input_data_end = .; 
 	}
 }
diff --git a/drivers/block/Kconfig b/drivers/block/Kconfig
index 17ee97f..64b7bda 100644
--- a/drivers/block/Kconfig
+++ b/drivers/block/Kconfig
@@ -406,6 +406,47 @@ config BLK_DEV_RAM_BLOCKSIZE
 	  setups function - apparently needed by the rd_load_image routine
 	  that supposes the filesystem in the image uses a 1024 blocksize.
 
+config LZMA_INITRD
+	boolean "Allow LZMA compression on initrd"
+	depends on BLK_DEV_INITRD=y
+	default "y"
+	help
+	  Use lzma compression on initrd, example 'lzma e initrd initrd.7z -d16'.
+	  If you have sufficient memory, you could compress using bigger dictionary size,
+	  'lzma e initrd initrd.7z'.
+
+config LZMA_INITRD_KMALLOC_ONLY
+	boolean "Use only kmalloc, do not use vmalloc on lzma initrd"
+	depends on LZMA_INITRD=y
+	default "n"
+	help
+	  Set to y if you do not want to use vmalloc, ie use only kmalloc.
+
+config LZMA_INITRAM_FS	  
+	boolean "Allow LZMA compression on initramfs"
+	depends on BLK_DEV_RAM=y
+	default "y"
+	help
+	  Use lzma compression on initramfs, example 'lzma e initramfs.cpio initramfs.cpio.lzma'.
+
+config LZMA_INITRAM_FS_SMALLMEM
+	boolean "Use lzma compression with small dictonary size."
+	depends on LZMA_INITRAM_FS=y
+	default "y"
+	help
+	  Use lzma compression on initramfs with small dictionary size, example 
+	  'lzma e initramfs.cpio initramfs.cpio.lzma -d16'.
+	  Affects only the initramfs.cpio in the ~usr directory, which is compiled into 
+	  the kernel. If you prepared initramfs.cpio for use with bootloader, you would
+	  need to specify the commandline options (-d16) yourself.
+
+config LZMA_INITRAM_FS_KMALLOC_ONLY
+	boolean "Use only kmalloc, do not use vmalloc on lzma initramfs"
+	depends on LZMA_INITRAM_FS=y
+	default "n"
+	help
+	  Set to y if you do not want to use vmalloc, ie use only kmalloc.
+
 config CDROM_PKTCDVD
 	tristate "Packet writing on CD/DVD media"
 	depends on !UML
diff --git a/fs/Kconfig b/fs/Kconfig
index 3c4886b..bdcc6fb 100644
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -1371,6 +1371,71 @@ config CRAMFS
 
 	  If unsure, say N.
 
+config SQUASHFS
+	tristate "SquashFS 3.2 - Squashed file system support"
+	select ZLIB_INFLATE
+	help
+	  Saying Y here includes support for SquashFS 3.2 (a Compressed Read-Only File
+	  System).  Squashfs is a highly compressed read-only filesystem for Linux.
+	  It uses zlib compression to compress both files, inodes and directories.
+	  Inodes in the system are very small and all blocks are packed to minimise
+	  data overhead. Block sizes greater than 4K are supported up to a maximum of 64K.
+	  SquashFS 3.1 supports 64 bit filesystems and files (larger than 4GB), full
+	  uid/gid information, hard links and timestamps.
+
+	  Squashfs is intended for general read-only filesystem use, for archival
+	  use (i.e. in cases where a .tar.gz file may be used), and in embedded
+	  systems where low overhead is needed.  Further information and filesystem tools
+	  are available from http://squashfs.sourceforge.net.
+
+	  If you want to compile this as a module ( = code which can be
+	  inserted in and removed from the running kernel whenever you want),
+	  say M here and read <file:Documentation/modules.txt>.  The module
+	  will be called squashfs.  Note that the root file system (the one
+	  containing the directory /) cannot be compiled as a module.
+
+	  If unsure, say N.
+
+config SQUASHFS_EMBEDDED
+
+	bool "Additional options for memory-constrained systems" 
+	depends on SQUASHFS
+	default n
+	help
+	  Saying Y here allows you to specify cache sizes and how Squashfs
+	  allocates memory.  This is only intended for memory constrained
+	  systems.
+
+	  If unsure, say N.
+
+config SQUASHFS_FRAGMENT_CACHE_SIZE
+	int "Number of fragments cached" if SQUASHFS_EMBEDDED
+	depends on SQUASHFS
+	default "3"
+	help
+	  By default SquashFS caches the last 3 fragments read from
+	  the filesystem.  Increasing this amount may mean SquashFS
+	  has to re-read fragments less often from disk, at the expense
+	  of extra system memory.  Decreasing this amount will mean
+	  SquashFS uses less memory at the expense of extra reads from disk.
+
+	  Note there must be at least one cached fragment.  Anything
+	  much more than three will probably not make much difference.
+
+config SQUASHFS_VMALLOC
+	bool "Use Vmalloc rather than Kmalloc" if SQUASHFS_EMBEDDED
+	depends on SQUASHFS
+	default n
+	help
+	  By default SquashFS uses kmalloc to obtain fragment cache memory.
+	  Kmalloc memory is the standard kernel allocator, but it can fail
+	  on memory constrained systems.  Because of the way Vmalloc works,
+	  Vmalloc can succeed when kmalloc fails.  Specifying this option
+	  will make SquashFS always use Vmalloc to allocate the
+	  fragment cache memory.
+
+	  If unsure, say N.
+
 config VXFS_FS
 	tristate "FreeVxFS file system support (VERITAS VxFS(TM) compatible)"
 	depends on BLOCK
@@ -2057,3 +2122,4 @@ source "fs/dlm/Kconfig"
 
 endmenu
 
+source "fs/aufs/Kconfig"
diff --git a/fs/Makefile b/fs/Makefile
index 9edf411..557766f 100644
--- a/fs/Makefile
+++ b/fs/Makefile
@@ -68,6 +68,7 @@ obj-$(CONFIG_JBD)		+= jbd/
 obj-$(CONFIG_JBD2)		+= jbd2/
 obj-$(CONFIG_EXT2_FS)		+= ext2/
 obj-$(CONFIG_CRAMFS)		+= cramfs/
+obj-$(CONFIG_SQUASHFS)		+= squashfs/
 obj-$(CONFIG_RAMFS)		+= ramfs/
 obj-$(CONFIG_HUGETLBFS)		+= hugetlbfs/
 obj-$(CONFIG_CODA_FS)		+= coda/
@@ -114,3 +115,4 @@ obj-$(CONFIG_HPPFS)		+= hppfs/
 obj-$(CONFIG_DEBUG_FS)		+= debugfs/
 obj-$(CONFIG_OCFS2_FS)		+= ocfs2/
 obj-$(CONFIG_GFS2_FS)           += gfs2/
+obj-$(CONFIG_AUFS)              += aufs/
diff --git a/fs/aufs/Kconfig b/fs/aufs/Kconfig
new file mode 100644
index 0000000..3a2121c
--- /dev/null
+++ b/fs/aufs/Kconfig
@@ -0,0 +1,73 @@
+config AUFS
+        tristate "Another unionfs"
+        help
+        Aufs is a stackable unification filesystem such as Unionfs,
+        which unifies several directories and provides a merged single
+        directory.
+        In the early days, aufs was entirely re-designed and
+        re-implemented Unionfs Version 1.x series. After many original
+        ideas, approaches and improvements, it becomes totally
+        different from Unionfs while keeping the basic features.
+        See Unionfs for the basic features.
+
+if AUFS
+comment "These options are generated automatically for "#UTS_RELEASE
+
+config AUFS_FAKE_DM
+        bool "Use simplified (fake) nameidata"
+        depends on AUFS
+        default y
+        help
+        Faking nameidata (VFS internal data), you can get better performance
+        in some cases.
+
+choice
+        prompt "Maximum number of branches"
+        depends on AUFS
+        default AUFS_BRANCH_MAX_127
+        help
+        Specifies the maximum number of branches (or member directories) in a single aufs. The larger value consumes more system resources and has an impact to performance.
+config AUFS_BRANCH_MAX_127
+        bool "127"
+        help
+        Specifies the maximum number of branches (or member directories) in a single aufs. The larger value consumes more system resources and has an impact to performance.
+config AUFS_BRANCH_MAX_511
+        bool "511"
+        help
+        Specifies the maximum number of branches (or member directories) in a single aufs. The larger value consumes more system resources and has an impact to performance.
+config AUFS_BRANCH_MAX_1023
+        bool "1023"
+        help
+        Specifies the maximum number of branches (or member directories) in a single aufs. The larger value consumes more system resources and has an impact to performance.
+
+config AUFS_BRANCH_MAX_32767
+        bool "32767"
+        help
+        Specifies the maximum number of branches (or member directories) in a single aufs. The larger value consumes more system resources and has an impact to performance.
+endchoice
+config AUFS_DEBUG
+        bool "Debug aufs"
+        depends on AUFS
+        default y
+        help
+        Enable this to compile aufs internal debug code.
+        The performance will be damaged.
+
+config AUFS_COMPAT
+        bool "Compatibility with Unionfs (obsolete)"
+        depends on AUFS
+        default n
+        help
+        This makes aufs compatible with unionfs-style mount options and some
+        behaviours.
+        The dirs= mount option and =nfsro branch permission flag are always
+        interpreted as br: mount option and =ro flag respectively. The
+        'debug', 'delete' and 'imap' mount options are ignored.
+        If you disable this option, you will get,
+        - aufs issues a warning about the ignored mount options
+        - the default branch permission flag is set. RW for the first branch,
+          and RO for the rests.
+        - the name of a internal file which represents the directory is
+          'opaque', becomes '.wh..wh..opq'
+        - the 'diropq=w' mount option is set by default
+endif
diff --git a/fs/aufs/Makefile b/fs/aufs/Makefile
new file mode 100755
index 0000000..0ee3cd0
--- /dev/null
+++ b/fs/aufs/Makefile
@@ -0,0 +1,18 @@
+# AUFS Makefile for the Linux 2.6.16 and later
+# $Id: Makefile,v 1.29 2007/04/23 00:59:50 sfjro Exp $
+
+obj-$(CONFIG_AUFS) += aufs.o
+aufs-y := module.o super.o sbinfo.o xino.o \
+	branch.o cpup.o whout.o plink.o wkq.o dcsub.o vfsub.o \
+	opts.o \
+	dentry.o dinfo.o \
+	file.o f_op.o finfo.o \
+	dir.o vdir.o \
+	inode.o i_op.o i_op_add.o i_op_del.o i_op_ren.o iinfo.o \
+	misc.o
+#xattr.o
+aufs-$(CONFIG_AUFS_SYSAUFS) += sysaufs.o
+aufs-$(CONFIG_AUFS_HINOTIFY) += hinotify.o
+aufs-$(CONFIG_AUFS_EXPORT) += export.o
+#aufs-$(CONFIG_DEBUGFS) += dbgfs.o
+aufs-$(CONFIG_AUFS_DEBUG) += debug.o
diff --git a/fs/aufs/aufs.h b/fs/aufs/aufs.h
new file mode 100755
index 0000000..79b3b87
--- /dev/null
+++ b/fs/aufs/aufs.h
@@ -0,0 +1,64 @@
+/*
+ * Copyright (C) 2005, 2006, 2007 Junjiro Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+/* $Id: aufs.h,v 1.24 2007/05/14 03:41:51 sfjro Exp $ */
+
+#ifndef __AUFS_H__
+#define __AUFS_H__
+
+#ifdef __KERNEL__
+
+#include <linux/version.h>
+
+/* limited support before 2.6.16, curretly 2.6.15 only. */
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,16)
+#define atomic_long_t		atomic_t
+#define atomic_long_set		atomic_set
+#define timespec_to_ns(ts)	({(long long)(ts)->tv_sec;})
+#define D_CHILD			d_child
+#else
+#define D_CHILD			d_u.d_child
+#endif
+
+/* ---------------------------------------------------------------------- */
+
+#include "debug.h"
+
+#include "branch.h"
+#include "cpup.h"
+#include "dcsub.h"
+#include "dentry.h"
+#include "dir.h"
+#include "file.h"
+#include "inode.h"
+#include "misc.h"
+#include "module.h"
+#include "opts.h"
+#include "super.h"
+#include "sysaufs.h"
+#include "vfsub.h"
+#include "whout.h"
+#include "wkq.h"
+//#include "xattr.h"
+
+#if defined(CONFIG_AUFS_MODULE) && !defined(CONFIG_AUFS_KSIZE_PATCH)
+#define ksize(p)	(-1U)
+#endif
+
+#endif /* __KERNEL__ */
+#endif /* __AUFS_H__ */
diff --git a/fs/aufs/branch.c b/fs/aufs/branch.c
new file mode 100755
index 0000000..f1ce008
--- /dev/null
+++ b/fs/aufs/branch.c
@@ -0,0 +1,818 @@
+/*
+ * Copyright (C) 2005, 2006, 2007 Junjiro Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+/* $Id: branch.c,v 1.49 2007/05/14 03:38:23 sfjro Exp $ */
+
+//#include <linux/fs.h>
+//#include <linux/namei.h>
+#include "aufs.h"
+
+static void free_branch(struct aufs_branch *br)
+{
+	TraceEnter();
+
+	if (br->br_xino)
+		fput(br->br_xino);
+	dput(br->br_wh);
+	dput(br->br_plink);
+	mntput(br->br_mnt);
+	DEBUG_ON(br_count(br) || atomic_read(&br->br_wh_running));
+	kfree(br);
+}
+
+/*
+ * frees all branches
+ */
+void free_branches(struct aufs_sbinfo *sbinfo)
+{
+	aufs_bindex_t bmax;
+	struct aufs_branch **br;
+
+	TraceEnter();
+	bmax = sbinfo->si_bend + 1;
+	br = sbinfo->si_branch;
+	while (bmax--)
+		free_branch(*br++);
+}
+
+/*
+ * find the index of a branch which is specified by @br_id.
+ */
+int find_brindex(struct super_block *sb, aufs_bindex_t br_id)
+{
+	aufs_bindex_t bindex, bend;
+
+	TraceEnter();
+
+	bend = sbend(sb);
+	for (bindex = 0; bindex <= bend; bindex++)
+		if (sbr_id(sb, bindex) == br_id)
+			return bindex;
+	return -1;
+}
+
+/*
+ * test if the @br is readonly or not.
+ */
+int br_rdonly(struct aufs_branch *br)
+{
+	return ((br->br_mnt->mnt_sb->s_flags & MS_RDONLY)
+		|| !br_writable(br->br_perm))
+		? -EROFS : 0;
+}
+
+/*
+ * returns writable branch index, otherwise an error.
+ * todo: customizable writable-branch-policy
+ */
+static int find_rw_parent(struct dentry *dentry, aufs_bindex_t bend)
+{
+	int err;
+	aufs_bindex_t bindex, candidate;
+	struct super_block *sb;
+	struct dentry *parent, *hidden_parent;
+
+	err = bend;
+	sb = dentry->d_sb;
+	parent = dget_parent(dentry);
+#if 1 // branch policy
+	hidden_parent = au_h_dptr_i(parent, bend);
+	if (hidden_parent && !br_rdonly(stobr(sb, bend)))
+		goto out; /* success */
+#endif
+
+	candidate = -1;
+	for (bindex = dbstart(parent); bindex <= bend; bindex++) {
+		hidden_parent = au_h_dptr_i(parent, bindex);
+		if (hidden_parent && !br_rdonly(stobr(sb, bindex))) {
+#if 0 // branch policy
+			if (candidate == -1)
+				candidate = bindex;
+			if (!au_test_perm(hidden_parent->d_inode, MAY_WRITE))
+				return bindex;
+#endif
+			err = bindex;
+			goto out; /* success */
+		}
+	}
+#if 0 // branch policy
+	err = candidate;
+	if (candidate != -1)
+		goto out; /* success */
+#endif
+	err = -EROFS;
+
+ out:
+	dput(parent);
+	return err;
+}
+
+int find_rw_br(struct super_block *sb, aufs_bindex_t bend)
+{
+	aufs_bindex_t bindex;
+
+	for (bindex = bend; bindex >= 0; bindex--)
+		if (!br_rdonly(stobr(sb, bindex)))
+			return bindex;
+	return -EROFS;
+}
+
+int find_rw_parent_br(struct dentry *dentry, aufs_bindex_t bend)
+{
+	int err;
+
+	err = find_rw_parent(dentry, bend);
+	if (err >= 0)
+		return err;
+	return find_rw_br(dentry->d_sb, bend);
+}
+
+/* ---------------------------------------------------------------------- */
+
+/*
+ * test if two hidden_dentries have overlapping branches.
+ */
+//todo: try is_subdir()
+static int do_is_overlap(struct super_block *sb, struct dentry *hidden_d1,
+			 struct dentry *hidden_d2)
+{
+	struct dentry *d;
+
+	d = hidden_d1;
+	do {
+		if (unlikely(d == hidden_d2))
+			return 1;
+		d = d->d_parent; // dget_parent()
+	} while (!IS_ROOT(d));
+
+	return (d == hidden_d2);
+}
+
+#if defined(CONFIG_BLK_DEV_LOOP) || defined(CONFIG_BLK_DEV_LOOP_MODULE)
+#include <linux/loop.h>
+static int is_overlap_loopback(struct super_block *sb, struct dentry *hidden_d1,
+			       struct dentry *hidden_d2)
+{
+	struct inode *hidden_inode;
+	struct loop_device *l;
+
+	hidden_inode = hidden_d1->d_inode;
+	if (MAJOR(hidden_inode->i_sb->s_dev) != LOOP_MAJOR)
+		return 0;
+
+	l = hidden_inode->i_sb->s_bdev->bd_disk->private_data;
+	hidden_d1 = l->lo_backing_file->f_dentry;
+	if (unlikely(hidden_d1->d_sb == sb))
+		return 1;
+	return do_is_overlap(sb, hidden_d1, hidden_d2);
+}
+#else
+#define is_overlap_loopback(sb, hidden_d1, hidden_d2) 0
+#endif
+
+static int is_overlap(struct super_block *sb, struct dentry *hidden_d1,
+		      struct dentry *hidden_d2)
+{
+	LKTRTrace("d1 %.*s, d2 %.*s\n", DLNPair(hidden_d1), DLNPair(hidden_d2));
+	if (unlikely(hidden_d1 == hidden_d2))
+		return 1;
+	return do_is_overlap(sb, hidden_d1, hidden_d2)
+		|| do_is_overlap(sb, hidden_d2, hidden_d1)
+		|| is_overlap_loopback(sb, hidden_d1, hidden_d2)
+		|| is_overlap_loopback(sb, hidden_d2, hidden_d1);
+}
+
+/* ---------------------------------------------------------------------- */
+
+static int init_br_wh(struct super_block *sb, aufs_bindex_t bindex,
+		      struct aufs_branch *br, int new_perm,
+		      struct dentry *h_root, struct vfsmount *h_mnt)
+{
+	int err, old_perm;
+	struct inode *dir = sb->s_root->d_inode,
+		*h_dir = h_root->d_inode;
+	const int new = (bindex < 0);
+
+	LKTRTrace("b%d, new_perm %d\n", bindex, new_perm);
+
+	if (new)
+		hi_lock_parent(h_dir);
+	else
+		hdir_lock(h_dir, dir, bindex);
+
+	br_wh_write_lock(br);
+	old_perm = br->br_perm;
+	br->br_perm = new_perm;
+	err = init_wh(h_root, br, au_do_nfsmnt(h_mnt), sb);
+	br->br_perm = old_perm;
+	br_wh_write_unlock(br);
+
+	if (new)
+		i_unlock(h_dir);
+	else
+		hdir_unlock(h_dir, dir, bindex);
+
+	TraceErr(err);
+	return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+/*
+ * returns a newly allocated branch. @new_nbranch is a number of branches
+ * after adding a branch.
+ */
+static struct aufs_branch *alloc_addbr(struct super_block *sb, int new_nbranch)
+{
+	struct aufs_branch **branchp, *add_branch;
+	int sz;
+	void *p;
+	struct dentry *root;
+	struct inode *inode;
+	struct aufs_hinode *hinodep;
+	struct aufs_hdentry *hdentryp;
+
+	LKTRTrace("new_nbranch %d\n", new_nbranch);
+	SiMustWriteLock(sb);
+	root = sb->s_root;
+	DiMustWriteLock(root);
+	inode = root->d_inode;
+	IiMustWriteLock(inode);
+
+	add_branch = kmalloc(sizeof(*add_branch), GFP_KERNEL);
+	//if (LktrCond) {kfree(add_branch); add_branch = NULL;}
+	if (unlikely(!add_branch))
+		goto out;
+
+	sz = sizeof(*branchp) * (new_nbranch - 1);
+	if (unlikely(!sz))
+		sz = sizeof(*branchp);
+	p = stosi(sb)->si_branch;
+	branchp = au_kzrealloc(p, sz, sizeof(*branchp) * new_nbranch,
+			       GFP_KERNEL);
+	//if (LktrCond) branchp = NULL;
+	if (unlikely(!branchp))
+		goto out;
+	stosi(sb)->si_branch = branchp;
+
+	sz = sizeof(*hdentryp) * (new_nbranch - 1);
+	if (unlikely(!sz))
+		sz = sizeof(*hdentryp);
+	p = dtodi(root)->di_hdentry;
+	hdentryp = au_kzrealloc(p, sz, sizeof(*hdentryp) * new_nbranch,
+				GFP_KERNEL);
+	//if (LktrCond) hdentryp = NULL;
+	if (unlikely(!hdentryp))
+		goto out;
+	dtodi(root)->di_hdentry = hdentryp;
+
+	sz = sizeof(*hinodep) * (new_nbranch - 1);
+	if (unlikely(!sz))
+		sz = sizeof(*hinodep);
+	p = itoii(inode)->ii_hinode;
+	hinodep = au_kzrealloc(p, sz, sizeof(*hinodep) * new_nbranch,
+			       GFP_KERNEL);
+	//if (LktrCond) hinodep = NULL; // unavailable test
+	if (unlikely(!hinodep))
+		goto out;
+	itoii(inode)->ii_hinode = hinodep;
+	return add_branch; /* success */
+
+ out:
+	kfree(add_branch);
+	TraceErr(-ENOMEM);
+	return ERR_PTR(-ENOMEM);
+}
+
+/*
+ * test if the branch permission is legal or not.
+ */
+static int test_br(struct super_block *sb, struct inode *inode, int brperm,
+		   char *path)
+{
+	int err;
+
+	err = 0;
+	if (unlikely(br_writable(brperm) && IS_RDONLY(inode))) {
+		Err("write permission for readonly fs or inode, %s\n", path);
+		err = -EINVAL;
+	}
+
+	TraceErr(err);
+	return err;
+}
+
+/*
+ * retunrs,,,
+ * 0: success, the caller will add it
+ * plus: success, it is already unified, the caller should ignore it
+ * minus: error
+ */
+static int test_add(struct super_block *sb, struct opt_add *add, int remount)
+{
+	int err;
+	struct dentry *root;
+	struct inode *inode, *hidden_inode;
+	aufs_bindex_t bend, bindex;
+
+	LKTRTrace("%s, remo%d\n", add->path, remount);
+
+	root = sb->s_root;
+	if (unlikely(au_find_dbindex(root, add->nd.dentry) != -1)) {
+		err = 1;
+		if (!remount) {
+			err = -EINVAL;
+			Err("%s duplicated\n", add->path);
+		}
+		goto out;
+	}
+
+	err = -ENOSPC; //-E2BIG;
+	bend = sbend(sb);
+	//if (LktrCond) bend = AUFS_BRANCH_MAX;
+	if (unlikely(AUFS_BRANCH_MAX <= add->bindex
+		     || AUFS_BRANCH_MAX - 1 <= bend)) {
+		Err("number of branches exceeded %s\n", add->path);
+		goto out;
+	}
+
+	err = -EDOM;
+	if (unlikely(add->bindex < 0 || bend + 1 < add->bindex)) {
+		Err("bad index %d\n", add->bindex);
+		goto out;
+	}
+
+	inode = add->nd.dentry->d_inode;
+	DEBUG_ON(!inode || !S_ISDIR(inode->i_mode));
+	err = -ENOENT;
+	if (unlikely(!inode->i_nlink)) {
+		Err("no existence %s\n", add->path);
+		goto out;
+	}
+
+	err = -EINVAL;
+	if (unlikely(inode->i_sb == sb)) {
+		Err("%s must be outside\n", add->path);
+		goto out;
+	}
+
+#if 1 //ndef CONFIG_AUFS_ROBR
+	if (unlikely(au_is_aufs(inode->i_sb)
+		     || !strcmp(au_sbtype(inode->i_sb), "unionfs"))) {
+		Err("nested " AUFS_NAME " %s\n", add->path);
+		goto out;
+	}
+#endif
+
+#ifdef AuNoNfsBranch
+	if (unlikely(au_is_nfs(inode->i_sb))) {
+		Err(AuNoNfsBranchMsg ". %s\n", add->path);
+		goto out;
+	}
+#endif
+
+	err = test_br(sb, add->nd.dentry->d_inode, add->perm, add->path);
+	if (unlikely(err))
+		goto out;
+
+	if (unlikely(bend == -1))
+		return 0; /* success */
+
+	hidden_inode = au_h_dptr(root)->d_inode;
+	if (unlikely(au_flag_test(sb, AuFlag_WARN_PERM)
+		     && ((hidden_inode->i_mode & S_IALLUGO)
+			 != (inode->i_mode & S_IALLUGO)
+			 || hidden_inode->i_uid != inode->i_uid
+			 || hidden_inode->i_gid != inode->i_gid)))
+		Warn("uid/gid/perm %s %u/%u/0%o, %u/%u/0%o\n",
+		     add->path,
+		     inode->i_uid, inode->i_gid, (inode->i_mode & S_IALLUGO),
+		     hidden_inode->i_uid, hidden_inode->i_gid,
+		     (hidden_inode->i_mode & S_IALLUGO));
+
+	err = -EINVAL;
+	for (bindex = 0; bindex <= bend; bindex++)
+		if (unlikely(is_overlap(sb, add->nd.dentry,
+					au_h_dptr_i(root, bindex)))) {
+			Err("%s is overlapped\n", add->path);
+			goto out;
+		}
+	err = 0;
+
+ out:
+	TraceErr(err);
+	return err;
+}
+
+int br_add(struct super_block *sb, struct opt_add *add, int remount)
+{
+	int err, sz;
+	aufs_bindex_t bend, add_bindex;
+	struct dentry *root;
+	struct aufs_iinfo *iinfo;
+	struct aufs_sbinfo *sbinfo;
+	struct aufs_dinfo *dinfo;
+	struct inode *root_inode;
+	unsigned long long maxb;
+	struct aufs_branch **branchp, *add_branch;
+	struct aufs_hdentry *hdentryp;
+	struct aufs_hinode *hinodep;
+
+	LKTRTrace("b%d, %s, 0x%x, %.*s\n", add->bindex, add->path,
+		  add->perm, DLNPair(add->nd.dentry));
+	SiMustWriteLock(sb);
+	root = sb->s_root;
+	DiMustWriteLock(root);
+	root_inode = root->d_inode;
+	IMustLock(root_inode);
+	IiMustWriteLock(root_inode);
+
+	err = test_add(sb, add, remount);
+	if (unlikely(err < 0))
+		goto out;
+	if (unlikely(err))
+		return 0; /* success */
+
+	bend = sbend(sb);
+	add_branch = alloc_addbr(sb, bend + 2);
+	err = PTR_ERR(add_branch);
+	if (IS_ERR(add_branch))
+		goto out;
+
+	err = 0;
+	rw_init_nolock(&add_branch->br_wh_rwsem);
+	add_branch->br_wh = add_branch->br_plink = NULL;
+	if (unlikely(br_writable(add->perm))) {
+		err = init_br_wh(sb, /*bindex*/-1, add_branch, add->perm,
+				 add->nd.dentry, add->nd.mnt);
+		if (unlikely(err)) {
+			kfree(add_branch);
+			goto out;
+		}
+	}
+	add_branch->br_xino = NULL;
+	add_branch->br_mnt = mntget(add->nd.mnt);
+	atomic_set(&add_branch->br_wh_running, 0);
+	add_branch->br_id = new_br_id(sb);
+	add_branch->br_perm = add->perm;
+	atomic_set(&add_branch->br_count, 0);
+
+	sbinfo = stosi(sb);
+	dinfo = dtodi(root);
+	iinfo = itoii(root_inode);
+
+	add_bindex = add->bindex;
+	sz = sizeof(*(sbinfo->si_branch)) * (bend + 1 - add_bindex);
+	branchp = sbinfo->si_branch + add_bindex;
+	memmove(branchp + 1, branchp, sz);
+	*branchp = add_branch;
+	sz = sizeof(*hdentryp) * (bend + 1 - add_bindex);
+	hdentryp = dinfo->di_hdentry + add_bindex;
+	memmove(hdentryp + 1, hdentryp, sz);
+	hdentryp->hd_dentry = NULL;
+	sz = sizeof(*hinodep) * (bend + 1 - add_bindex);
+	hinodep = iinfo->ii_hinode + add_bindex;
+	memmove(hinodep + 1, hinodep, sz);
+	hinodep->hi_inode = NULL;
+	hinodep->hi_notify = NULL;
+
+	sbinfo->si_bend++;
+	dinfo->di_bend++;
+	iinfo->ii_bend++;
+	if (unlikely(bend == -1)) {
+		dinfo->di_bstart = 0;
+		iinfo->ii_bstart = 0;
+	}
+	set_h_dptr(root, add_bindex, dget(add->nd.dentry));
+	set_h_iptr(root_inode, add_bindex, igrab(add->nd.dentry->d_inode), 0);
+	if (!add_bindex)
+		au_cpup_attr_all(root_inode);
+	else
+		au_add_nlink(root_inode, add->nd.dentry->d_inode);
+	maxb = add->nd.dentry->d_sb->s_maxbytes;
+	if (sb->s_maxbytes < maxb)
+		sb->s_maxbytes = maxb;
+
+	if (au_flag_test(sb, AuFlag_XINO)) {
+		struct file *base_file = stobr(sb, 0)->br_xino;
+		if (!add_bindex)
+			base_file = stobr(sb, 1)->br_xino;
+		err = xino_init(sb, add_bindex, base_file, /*do_test*/1);
+		if (unlikely(err)) {
+			DEBUG_ON(add_branch->br_xino);
+			Err("ignored xino err %d, force noxino\n", err);
+			err = 0;
+			au_flag_clr(sb, AuFlag_XINO);
+		}
+	}
+
+ out:
+	TraceErr(err);
+	return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+/*
+ * test if the branch is deletable or not.
+ */
+static int test_children_busy(struct dentry *root, aufs_bindex_t bindex)
+{
+	int err, i, j, sigen;
+	struct au_dcsub_pages dpages;
+
+	LKTRTrace("b%d\n", bindex);
+	SiMustWriteLock(root->d_sb);
+	DiMustWriteLock(root);
+
+	err = au_dpages_init(&dpages, GFP_KERNEL);
+	if (unlikely(err))
+		goto out;
+	err = au_dcsub_pages(&dpages, root, NULL, NULL);
+	if (unlikely(err))
+		goto out_dpages;
+
+	sigen = au_sigen(root->d_sb);
+	DiMustNoWaiters(root);
+	IiMustNoWaiters(root->d_inode);
+	di_write_unlock(root);
+	for (i = 0; !err && i < dpages.ndpage; i++) {
+		struct au_dpage *dpage;
+		dpage = dpages.dpages + i;
+		for (j = 0; !err && j < dpage->ndentry; j++) {
+			struct dentry *d;
+
+			d = dpage->dentries[j];
+			if (au_digen(d) == sigen)
+				di_read_lock_child(d, AUFS_I_RLOCK);
+			else {
+				di_write_lock_child(d);
+				err = au_reval_dpath(d, sigen);
+				if (!err)
+					di_downgrade_lock(d, AUFS_I_RLOCK);
+				else {
+					di_write_unlock(d);
+					break;
+				}
+			}
+
+			if (au_h_dptr_i(d, bindex)
+			    && (!S_ISDIR(d->d_inode->i_mode)
+				|| dbstart(d) == dbend(d)))
+				err = -EBUSY;
+			di_read_unlock(d, AUFS_I_RLOCK);
+			if (err)
+				LKTRTrace("%.*s\n", DLNPair(d));
+		}
+	}
+	di_write_lock_child(root); /* aufs_write_lock() calls ..._child() */
+
+ out_dpages:
+	au_dpages_free(&dpages);
+ out:
+	TraceErr(err);
+	return err;
+}
+
+int br_del(struct super_block *sb, struct opt_del *del, int remount)
+{
+	int err, do_wh, rerr;
+	struct dentry *root;
+	struct inode *inode, *hidden_dir;
+	aufs_bindex_t bindex, bend, br_id;
+	struct aufs_sbinfo *sbinfo;
+	struct aufs_dinfo *dinfo;
+	struct aufs_iinfo *iinfo;
+	struct aufs_branch *br;
+
+	LKTRTrace("%s, %.*s\n", del->path, DLNPair(del->h_root));
+	SiMustWriteLock(sb);
+	root = sb->s_root;
+	DiMustWriteLock(root);
+	inode = root->d_inode;
+	IiMustWriteLock(inode);
+
+	bindex = au_find_dbindex(root, del->h_root);
+	if (unlikely(bindex < 0)) {
+		if (remount)
+			return 0; /* success */
+		err = -ENOENT;
+		Err("%s no such branch\n", del->path);
+		goto out;
+	}
+	LKTRTrace("bindex b%d\n", bindex);
+
+	err = -EBUSY;
+	bend = sbend(sb);
+	br = stobr(sb, bindex);
+	if (unlikely(!bend || br_count(br))) {
+		LKTRTrace("bend %d, br_count %d\n", bend, br_count(br));
+		goto out;
+	}
+
+	do_wh = 0;
+	hidden_dir = del->h_root->d_inode;
+	if (unlikely(br->br_wh || br->br_plink)) {
+#if 0
+		/* remove whiteout base */
+		err = init_br_wh(sb, bindex, br, AuBr_RO, del->h_root,
+				 br->br_mnt);
+		if (unlikely(err))
+			goto out;
+#else
+		dput(br->br_wh);
+		dput(br->br_plink);
+		br->br_wh = br->br_plink = NULL;
+#endif
+		do_wh = 1;
+	}
+
+	err = test_children_busy(root, bindex);
+	if (unlikely(err)) {
+		if (unlikely(do_wh))
+			goto out_wh;
+		goto out;
+	}
+
+	err = 0;
+	sbinfo = stosi(sb);
+	dinfo = dtodi(root);
+	iinfo = itoii(inode);
+
+	dput(au_h_dptr_i(root, bindex));
+	aufs_hiput(iinfo->ii_hinode + bindex);
+	br_id = br->br_id;
+	free_branch(br);
+
+	//todo: realloc and shrink memeory
+	if (bindex < bend) {
+		const aufs_bindex_t n = bend - bindex;
+		struct aufs_branch **brp;
+		struct aufs_hdentry *hdp;
+		struct aufs_hinode *hip;
+
+		brp = sbinfo->si_branch + bindex;
+		memmove(brp, brp + 1, sizeof(*brp) * n);
+		hdp = dinfo->di_hdentry + bindex;
+		memmove(hdp, hdp + 1, sizeof(*hdp) * n);
+		hip = iinfo->ii_hinode + bindex;
+		memmove(hip, hip + 1, sizeof(*hip) * n);
+	}
+	sbinfo->si_branch[0 + bend] = NULL;
+	dinfo->di_hdentry[0 + bend].hd_dentry = NULL;
+	iinfo->ii_hinode[0 + bend].hi_inode = NULL;
+	iinfo->ii_hinode[0 + bend].hi_notify = NULL;
+
+	sbinfo->si_bend--;
+	dinfo->di_bend--;
+	iinfo->ii_bend--;
+	if (!bindex)
+		au_cpup_attr_all(inode);
+	else
+		au_sub_nlink(inode, del->h_root->d_inode);
+	if (au_flag_test(sb, AuFlag_PLINK))
+		half_refresh_plink(sb, br_id);
+
+	if (sb->s_maxbytes == del->h_root->d_sb->s_maxbytes) {
+		bend--;
+		sb->s_maxbytes = 0;
+		for (bindex = 0; bindex <= bend; bindex++) {
+			unsigned long long maxb;
+			maxb = sbr_sb(sb, bindex)->s_maxbytes;
+			if (sb->s_maxbytes < maxb)
+				sb->s_maxbytes = maxb;
+		}
+	}
+	goto out; /* success */
+
+ out_wh:
+	/* revert */
+	rerr = init_br_wh(sb, bindex, br, br->br_perm, del->h_root, br->br_mnt);
+	if (rerr)
+		Warn("failed re-creating base whiteout, %s. (%d)\n",
+		     del->path, rerr);
+ out:
+	TraceErr(err);
+	return err;
+}
+
+static int do_need_sigen_inc(int a, int b)
+{
+	return (br_whable(a) && !br_whable(b));
+}
+
+static int need_sigen_inc(int old, int new)
+{
+	return (do_need_sigen_inc(old, new)
+		|| do_need_sigen_inc(new, old));
+}
+
+int br_mod(struct super_block *sb, struct opt_mod *mod, int remount,
+	   int *do_update)
+{
+	int err;
+	struct dentry *root;
+	aufs_bindex_t bindex;
+	struct aufs_branch *br;
+	struct inode *hidden_dir;
+
+	LKTRTrace("%s, %.*s, 0x%x\n",
+		  mod->path, DLNPair(mod->h_root), mod->perm);
+	SiMustWriteLock(sb);
+	root = sb->s_root;
+	DiMustWriteLock(root);
+	IiMustWriteLock(root->d_inode);
+
+	bindex = au_find_dbindex(root, mod->h_root);
+	if (unlikely(bindex < 0)) {
+		if (remount)
+			return 0; /* success */
+		err = -ENOENT;
+		Err("%s no such branch\n", mod->path);
+		goto out;
+	}
+	LKTRTrace("bindex b%d\n", bindex);
+
+	hidden_dir = mod->h_root->d_inode;
+	err = test_br(sb, hidden_dir, mod->perm, mod->path);
+	if (unlikely(err))
+		goto out;
+
+	br = stobr(sb, bindex);
+	if (unlikely(br->br_perm == mod->perm))
+		return 0; /* success */
+
+	if (br_writable(br->br_perm)) {
+#if 1
+		/* remove whiteout base */
+		//todo: mod->perm?
+		err = init_br_wh(sb, bindex, br, AuBr_RO, mod->h_root,
+				 br->br_mnt);
+		if (unlikely(err))
+			goto out;
+#else
+		dput(br->br_wh);
+		dput(br->br_plink);
+		br->br_wh = br->br_plink = NULL;
+#endif
+
+		if (!br_writable(mod->perm)) {
+			/* rw --> ro, file might be mmapped */
+			struct file *file, *hf;
+
+#if 1 // test here
+			DiMustNoWaiters(root);
+			IiMustNoWaiters(root->d_inode);
+			di_write_unlock(root);
+
+			// no need file_list_lock() since sbinfo is locked
+			//file_list_lock();
+			list_for_each_entry(file, &sb->s_files, f_u.fu_list) {
+				LKTRTrace("%.*s\n", DLNPair(file->f_dentry));
+				fi_read_lock(file);
+				if (!S_ISREG(file->f_dentry->d_inode->i_mode)
+				    || !(file->f_mode & FMODE_WRITE)
+				    || fbstart(file) != bindex) {
+					FiMustNoWaiters(file);
+					fi_read_unlock(file);
+					continue;
+				}
+
+				// todo: already flushed?
+				hf = au_h_fptr(file);
+				hf->f_flags = au_file_roflags(hf->f_flags);
+				hf->f_mode &= ~FMODE_WRITE;
+				FiMustNoWaiters(file);
+				fi_read_unlock(file);
+			}
+			//file_list_unlock();
+
+			/* aufs_write_lock() calls ..._child() */
+			di_write_lock_child(root);
+#endif
+		}
+	}
+
+	*do_update |= need_sigen_inc(br->br_perm, mod->perm);
+	br->br_perm = mod->perm;
+	return err; /* success */
+
+ out:
+	TraceErr(err);
+	return err;
+}
diff --git a/fs/aufs/branch.h b/fs/aufs/branch.h
new file mode 100755
index 0000000..2557836
--- /dev/null
+++ b/fs/aufs/branch.h
@@ -0,0 +1,235 @@
+/*
+ * Copyright (C) 2005, 2006, 2007 Junjiro Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+/* $Id: branch.h,v 1.30 2007/05/14 03:41:51 sfjro Exp $ */
+
+#ifndef __AUFS_BRANCH_H__
+#define __AUFS_BRANCH_H__
+
+#ifdef __KERNEL__
+
+#include <linux/fs.h>
+#include <linux/mount.h>
+#include <linux/version.h>
+#include <linux/aufs_type.h>
+#include "misc.h"
+#include "super.h"
+
+/* protected by superblock rwsem */
+struct aufs_branch {
+	struct file		*br_xino;
+	readf_t			br_xino_read;
+	writef_t		br_xino_write;
+
+	aufs_bindex_t		br_id;
+
+	int			br_perm;
+	struct vfsmount		*br_mnt;
+	atomic_t		br_count;
+
+	/* whiteout base */
+	struct aufs_rwsem	br_wh_rwsem;
+	struct dentry		*br_wh;
+	atomic_t 		br_wh_running;
+
+	/* pseudo-link dir */
+	struct dentry		*br_plink;
+};
+
+/* ---------------------------------------------------------------------- */
+
+/* branch permission and attribute */
+enum {
+	AuBr_RW,		/* writable, linkable wh */
+	AuBr_RO,		/* readonly, no wh */
+	AuBr_RR,		/* natively readonly, no wh */
+
+	AuBr_RWNoLinkWH,	/* un-linkable whiteouts */
+
+	AuBr_ROWH,
+	AuBr_RRWH,		/* whiteout-able */
+
+	AuBr_Last
+};
+
+static inline int br_writable(int brperm)
+{
+	return (brperm == AuBr_RW
+		|| brperm == AuBr_RWNoLinkWH);
+}
+
+static inline int br_whable(int brperm)
+{
+	return (brperm == AuBr_RW
+		|| brperm == AuBr_ROWH
+		|| brperm == AuBr_RRWH);
+}
+
+static inline int br_linkable_wh(int brperm)
+{
+	return (brperm == AuBr_RW);
+}
+
+/* ---------------------------------------------------------------------- */
+
+#define _AuNoNfsBranchMsg "NFS branch is not supported"
+#if LINUX_VERSION_CODE == KERNEL_VERSION(2,6,15)
+#define AuNoNfsBranch
+#define AuNoNfsBranchMsg _AuNoNfsBranchMsg
+#elif LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,19) \
+	&& !defined(CONFIG_AUFS_LHASH_PATCH)
+#define AuNoNfsBranch
+#define AuNoNfsBranchMsg _AuNoNfsBranchMsg \
+	", try lhash.patch and CONFIG_AUFS_LHASH_PATCH"
+#endif
+
+/* ---------------------------------------------------------------------- */
+
+struct aufs_sbinfo;
+void free_branches(struct aufs_sbinfo *sinfo);
+int br_rdonly(struct aufs_branch *br);
+int find_brindex(struct super_block *sb, aufs_bindex_t br_id);
+int find_rw_br(struct super_block *sb, aufs_bindex_t bend);
+int find_rw_parent_br(struct dentry *dentry, aufs_bindex_t bend);
+struct opt_add;
+int br_add(struct super_block *sb, struct opt_add *add, int remount);
+struct opt_del;
+int br_del(struct super_block *sb, struct opt_del *del, int remount);
+struct opt_mod;
+int br_mod(struct super_block *sb, struct opt_mod *mod, int remount,
+	   int *do_update);
+
+/* ---------------------------------------------------------------------- */
+
+static inline int br_count(struct aufs_branch *br)
+{
+	return atomic_read(&br->br_count);
+}
+
+static inline void br_get(struct aufs_branch *br)
+{
+	atomic_inc(&br->br_count);
+}
+
+static inline void br_put(struct aufs_branch *br)
+{
+	atomic_dec(&br->br_count);
+}
+
+/* ---------------------------------------------------------------------- */
+
+/* Superblock to branch */
+static inline aufs_bindex_t sbr_id(struct super_block *sb, aufs_bindex_t bindex)
+{
+	return stobr(sb, bindex)->br_id;
+}
+
+static inline
+struct vfsmount *sbr_mnt(struct super_block *sb, aufs_bindex_t bindex)
+{
+	return stobr(sb, bindex)->br_mnt;
+}
+
+static inline
+struct super_block *sbr_sb(struct super_block *sb, aufs_bindex_t bindex)
+{
+	return sbr_mnt(sb, bindex)->mnt_sb;
+}
+
+#if 0
+static inline int sbr_count(struct super_block *sb, aufs_bindex_t bindex)
+{
+	return br_count(stobr(sb, bindex));
+}
+
+static inline void sbr_get(struct super_block *sb, aufs_bindex_t bindex)
+{
+	br_get(stobr(sb, bindex));
+}
+#endif
+
+static inline void sbr_put(struct super_block *sb, aufs_bindex_t bindex)
+{
+	br_put(stobr(sb, bindex));
+}
+
+static inline int sbr_perm(struct super_block *sb, aufs_bindex_t bindex)
+{
+	return stobr(sb, bindex)->br_perm;
+}
+
+static inline int sbr_is_whable(struct super_block *sb, aufs_bindex_t bindex)
+{
+	return br_whable(sbr_perm(sb, bindex));
+}
+
+/* ---------------------------------------------------------------------- */
+
+#ifdef CONFIG_AUFS_LHASH_PATCH
+static inline struct vfsmount *au_do_nfsmnt(struct vfsmount *h_mnt)
+{
+	if (!au_is_nfs(h_mnt->mnt_sb))
+		return NULL;
+	return h_mnt;
+}
+
+/* it doesn't mntget() */
+static inline
+struct vfsmount *au_nfsmnt(struct super_block *sb, aufs_bindex_t bindex)
+{
+	return au_do_nfsmnt(sbr_mnt(sb, bindex));
+}
+#else
+static inline struct vfsmount *au_do_nfsmnt(struct vfsmount *h_mnt)
+{
+	return NULL;
+}
+
+static inline
+struct vfsmount *au_nfsmnt(struct super_block *sb, aufs_bindex_t bindex)
+{
+	return NULL;
+}
+#endif /* CONFIG_AUFS_LHASH_PATCH */
+
+/* ---------------------------------------------------------------------- */
+
+/*
+ * br_wh_read_lock, br_wh_write_lock
+ * br_wh_read_unlock, br_wh_write_unlock, br_wh_downgrade_lock
+ */
+SimpleRwsemFuncs(br_wh, struct aufs_branch *br, br->br_wh_rwsem);
+
+/* to debug easier, do not make them inlined functions */
+#define BrWhMustReadLock(br) do { \
+	/* SiMustAnyLock(sb); */ \
+	RwMustReadLock(&(br)->br_wh_rwsem); \
+} while (0)
+
+#define BrWhMustWriteLock(br) do { \
+	/* SiMustAnyLock(sb); */ \
+	RwMustWriteLock(&(br)->br_wh_rwsem); \
+} while (0)
+
+#define BrWhMustAnyLock(br) do { \
+	/* SiMustAnyLock(sb); */ \
+	RwMustAnyLock(&(br)->br_wh_rwsem); \
+} while (0)
+
+#endif /* __KERNEL__ */
+#endif /* __AUFS_BRANCH_H__ */
diff --git a/fs/aufs/cpup.c b/fs/aufs/cpup.c
new file mode 100755
index 0000000..6636f40
--- /dev/null
+++ b/fs/aufs/cpup.c
@@ -0,0 +1,773 @@
+/*
+ * Copyright (C) 2005, 2006, 2007 Junjiro Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+/* $Id: cpup.c,v 1.37 2007/05/14 03:41:52 sfjro Exp $ */
+
+#include <asm/uaccess.h>
+#include "aufs.h"
+
+/* violent cpup_attr_*() functions don't care inode lock */
+void au_cpup_attr_timesizes(struct inode *inode)
+{
+	struct inode *hidden_inode;
+
+	LKTRTrace("i%lu\n", inode->i_ino);
+	//IMustLock(inode);
+	hidden_inode = au_h_iptr(inode);
+	DEBUG_ON(!hidden_inode);
+	//IMustLock(!hidden_inode);
+
+	inode->i_atime = hidden_inode->i_atime;
+	inode->i_mtime = hidden_inode->i_mtime;
+	inode->i_ctime = hidden_inode->i_ctime;
+	spin_lock(&inode->i_lock);
+	i_size_write(inode, i_size_read(hidden_inode));
+	inode->i_blocks = hidden_inode->i_blocks;
+	spin_unlock(&inode->i_lock);
+}
+
+void au_cpup_attr_nlink(struct inode *inode)
+{
+	struct inode *h_inode;
+
+	LKTRTrace("i%lu\n", inode->i_ino);
+	//IMustLock(inode);
+	DEBUG_ON(!inode->i_mode);
+
+	h_inode = au_h_iptr(inode);
+	inode->i_nlink = h_inode->i_nlink;
+
+	/*
+	 * fewer nlink makes find(1) noisy, but larger nlink doesn't.
+	 * it may includes whplink directory.
+	 */
+	if (unlikely(S_ISDIR(h_inode->i_mode))) {
+		aufs_bindex_t bindex, bend;
+		bend = ibend(inode);
+		for (bindex = ibstart(inode) + 1; bindex <= bend; bindex++) {
+			h_inode = au_h_iptr_i(inode, bindex);
+			if (h_inode)
+				au_add_nlink(inode, h_inode);
+		}
+	}
+}
+
+void au_cpup_attr_changable(struct inode *inode)
+{
+	struct inode *hidden_inode;
+
+	LKTRTrace("i%lu\n", inode->i_ino);
+	//IMustLock(inode);
+	hidden_inode = au_h_iptr(inode);
+	DEBUG_ON(!hidden_inode);
+
+	inode->i_mode = hidden_inode->i_mode;
+	inode->i_uid = hidden_inode->i_uid;
+	inode->i_gid = hidden_inode->i_gid;
+	au_cpup_attr_timesizes(inode);
+
+	//??
+	inode->i_flags = hidden_inode->i_flags;
+}
+
+void au_cpup_igen(struct inode *inode, struct inode *h_inode)
+{
+	inode->i_generation = h_inode->i_generation;
+	itoii(inode)->ii_hsb1 = h_inode->i_sb;
+}
+
+void au_cpup_attr_all(struct inode *inode)
+{
+	struct inode *hidden_inode;
+
+	LKTRTrace("i%lu\n", inode->i_ino);
+	//IMustLock(inode);
+	hidden_inode = au_h_iptr(inode);
+	DEBUG_ON(!hidden_inode);
+
+	au_cpup_attr_changable(inode);
+	if (inode->i_nlink > 0)
+		au_cpup_attr_nlink(inode);
+
+	switch (inode->i_mode & S_IFMT) {
+	case S_IFBLK:
+	case S_IFCHR:
+		inode->i_rdev = hidden_inode->i_rdev;
+	}
+	inode->i_blkbits = hidden_inode->i_blkbits;
+	au_cpup_attr_blksize(inode, hidden_inode);
+	au_cpup_igen(inode, hidden_inode);
+}
+
+/* ---------------------------------------------------------------------- */
+
+/* Note: dt_dentry and dt_hidden_dentry are not dget/dput-ed */
+
+/* keep the timestamps of the parent dir when cpup */
+void dtime_store(struct dtime *dt, struct dentry *dentry,
+		 struct dentry *hidden_dentry)
+{
+	struct inode *inode;
+
+	TraceEnter();
+	DEBUG_ON(!dentry || !hidden_dentry || !hidden_dentry->d_inode);
+
+	dt->dt_dentry = dentry;
+	dt->dt_h_dentry = hidden_dentry;
+	inode = hidden_dentry->d_inode;
+	dt->dt_atime = inode->i_atime;
+	dt->dt_mtime = inode->i_mtime;
+	//smp_mb();
+}
+
+// todo: remove extra parameter
+void dtime_revert(struct dtime *dt, int h_parent_is_locked)
+{
+	struct iattr attr;
+	int err;
+	struct dentry *dentry;
+
+	LKTRTrace("h_parent locked %d\n", h_parent_is_locked);
+
+	attr.ia_atime = dt->dt_atime;
+	attr.ia_mtime = dt->dt_mtime;
+	attr.ia_valid = ATTR_FORCE | ATTR_MTIME | ATTR_MTIME_SET
+		| ATTR_ATIME | ATTR_ATIME_SET;
+	//smp_mb();
+	dentry = NULL;
+	if (!h_parent_is_locked /* && !IS_ROOT(dt->dt_dentry) */)
+		dentry = dt->dt_dentry;
+	err = vfsub_notify_change(dt->dt_h_dentry, &attr,
+				  need_dlgt(dt->dt_dentry->d_sb));
+	if (unlikely(err))
+		Warn("restoring timestamps failed(%d). ignored\n", err);
+}
+
+/* ---------------------------------------------------------------------- */
+
+static int cpup_iattr(struct dentry *hidden_dst, struct dentry *hidden_src,
+		      int dlgt)
+{
+	int err;
+	struct iattr ia;
+	struct inode *hidden_isrc, *hidden_idst;
+
+	LKTRTrace("%.*s\n", DLNPair(hidden_dst));
+	hidden_idst = hidden_dst->d_inode;
+	//IMustLock(hidden_idst);
+	hidden_isrc = hidden_src->d_inode;
+	//IMustLock(hidden_isrc);
+
+	ia.ia_valid = ATTR_FORCE | ATTR_MODE | ATTR_UID | ATTR_GID
+		| ATTR_ATIME | ATTR_MTIME
+		| ATTR_ATIME_SET | ATTR_MTIME_SET;
+	ia.ia_mode = hidden_isrc->i_mode;
+	ia.ia_uid = hidden_isrc->i_uid;
+	ia.ia_gid = hidden_isrc->i_gid;
+	ia.ia_atime = hidden_isrc->i_atime;
+	ia.ia_mtime = hidden_isrc->i_mtime;
+	err = vfsub_notify_change(hidden_dst, &ia, dlgt);
+	//if (LktrCond) err = -1;
+	if (!err)
+		hidden_idst->i_flags = hidden_isrc->i_flags; //??
+
+	TraceErr(err);
+	return err;
+}
+
+/*
+ * to support a sparse file which is opened with O_APPEND,
+ * we need to close the file.
+ */
+static int cpup_regular(struct dentry *dentry, aufs_bindex_t bdst,
+			aufs_bindex_t bsrc, loff_t len)
+{
+	int err, i, sparse;
+	struct super_block *sb;
+	struct inode *hidden_inode;
+	enum {SRC, DST};
+	struct {
+		aufs_bindex_t bindex;
+		unsigned int flags;
+		struct dentry *dentry;
+		struct file *file;
+		void *label, *label_file;
+	} *h, hidden[] = {
+		{
+			.bindex = bsrc,
+			.flags = O_RDONLY | O_NOATIME | O_LARGEFILE,
+			.file = NULL,
+			.label = &&out,
+			.label_file = &&out_src_file
+		},
+		{
+			.bindex = bdst,
+			.flags = O_WRONLY | O_NOATIME | O_LARGEFILE,
+			.file = NULL,
+			.label = &&out_src_file,
+			.label_file = &&out_dst_file
+		}
+	};
+
+	LKTRTrace("dentry %.*s, bdst %d, bsrc %d, len %lld\n",
+		  DLNPair(dentry), bdst, bsrc, len);
+	DEBUG_ON(bsrc <= bdst);
+	DEBUG_ON(!len);
+	sb = dentry->d_sb;
+	DEBUG_ON(test_ro(sb, bdst, dentry->d_inode));
+	// bsrc branch can be ro/rw.
+
+	h = hidden;
+	for (i = 0; i < 2; i++, h++) {
+		h->dentry = au_h_dptr_i(dentry, h->bindex);
+		DEBUG_ON(!h->dentry);
+		hidden_inode = h->dentry->d_inode;
+		DEBUG_ON(!hidden_inode || !S_ISREG(hidden_inode->i_mode));
+		h->file = hidden_open(dentry, h->bindex, h->flags);
+		//if (LktrCond)
+		//{fput(h->file); sbr_put(sb, h->bindex); h->file = ERR_PTR(-1);}
+		err = PTR_ERR(h->file);
+		if (IS_ERR(h->file))
+			goto *h->label;
+		err = -EINVAL;
+		if (unlikely(!h->file->f_op))
+			goto *h->label_file;
+	}
+
+	/* stop updating while we copyup */
+	IMustLock(hidden[SRC].dentry->d_inode);
+	sparse = 0;
+	err = au_copy_file(hidden[DST].file, hidden[SRC].file, len, sb,
+			   &sparse);
+
+	/* sparse file: update i_blocks next time */
+	if (unlikely(!err && sparse))
+		d_drop(dentry);
+
+ out_dst_file:
+	fput(hidden[DST].file);
+	sbr_put(sb, hidden[DST].bindex);
+ out_src_file:
+	fput(hidden[SRC].file);
+	sbr_put(sb, hidden[SRC].bindex);
+ out:
+	TraceErr(err);
+	return err;
+}
+
+// unnecessary?
+unsigned int au_flags_cpup(unsigned int init, struct dentry *parent)
+{
+	if (unlikely(parent && IS_ROOT(parent)))
+		init |= CPUP_LOCKED_GHDIR;
+	return init;
+}
+
+/* return with hidden dst inode is locked */
+static int cpup_entry(struct dentry *dentry, aufs_bindex_t bdst,
+		      aufs_bindex_t bsrc, loff_t len, unsigned int flags,
+		      int dlgt)
+{
+	int err, isdir, symlen;
+	struct dentry *hidden_src, *hidden_dst, *hidden_parent, *parent;
+	struct inode *hidden_inode, *hidden_dir, *dir;
+	struct dtime dt;
+	umode_t mode;
+	char *sym;
+	mm_segment_t old_fs;
+	const int do_dt = flags & CPUP_DTIME;
+	struct super_block *sb;
+
+	LKTRTrace("%.*s, i%lu, bdst %d, bsrc %d, len %Ld, flags 0x%x\n",
+		  DLNPair(dentry), dentry->d_inode->i_ino, bdst, bsrc, len,
+		  flags);
+	sb = dentry->d_sb;
+	DEBUG_ON(bdst >= bsrc || test_ro(sb, bdst, NULL));
+	// bsrc branch can be ro/rw.
+
+	hidden_src = au_h_dptr_i(dentry, bsrc);
+	DEBUG_ON(!hidden_src);
+	hidden_inode = hidden_src->d_inode;
+	DEBUG_ON(!hidden_inode);
+
+	/* stop refrencing while we are creating */
+	//parent = dget_parent(dentry);
+	parent = dentry->d_parent;
+	dir = parent->d_inode;
+	hidden_dst = au_h_dptr_i(dentry, bdst);
+	DEBUG_ON(hidden_dst && hidden_dst->d_inode);
+	//hidden_parent = dget_parent(hidden_dst);
+	hidden_parent = hidden_dst->d_parent;
+	hidden_dir = hidden_parent->d_inode;
+	IMustLock(hidden_dir);
+
+	if (do_dt)
+		dtime_store(&dt, parent, hidden_parent);
+
+	isdir = 0;
+	mode = hidden_inode->i_mode;
+	switch (mode & S_IFMT) {
+	case S_IFREG:
+		/* stop updating while we are referencing */
+		IMustLock(hidden_inode);
+		err = vfsub_create(hidden_dir, hidden_dst, mode | S_IWUSR, NULL,
+				   dlgt);
+		//if (LktrCond) {vfs_unlink(hidden_dir, hidden_dst); err = -1;}
+		if (!err) {
+			loff_t l = i_size_read(hidden_inode);
+			if (len == -1 || l < len)
+				len = l;
+			if (len) {
+				err = cpup_regular(dentry, bdst, bsrc, len);
+				//if (LktrCond) err = -1;
+			}
+			if (unlikely(err)) {
+				int rerr;
+				rerr = vfsub_unlink(hidden_dir, hidden_dst,
+						    dlgt);
+				if (rerr) {
+					IOErr("failed unlinking cpup-ed %.*s"
+					      "(%d, %d)\n",
+					      DLNPair(hidden_dst), err, rerr);
+					err = -EIO;
+				}
+			}
+		}
+		break;
+	case S_IFDIR:
+		isdir = 1;
+		err = vfsub_mkdir(hidden_dir, hidden_dst, mode, dlgt);
+		//if (LktrCond) {vfs_rmdir(hidden_dir, hidden_dst); err = -1;}
+		if (!err) {
+			/* setattr case: dir is not locked */
+			if (0 && ibstart(dir) == bdst)
+				au_cpup_attr_nlink(dir);
+			au_cpup_attr_nlink(dentry->d_inode);
+		}
+		break;
+	case S_IFLNK:
+		err = -ENOMEM;
+		sym = __getname();
+		//if (LktrCond) {__putname(sym); sym = NULL;}
+		if (unlikely(!sym))
+			break;
+		old_fs = get_fs();
+		set_fs(KERNEL_DS);
+		err = symlen = hidden_inode->i_op->readlink
+			(hidden_src, (char __user*)sym, PATH_MAX);
+		//if (LktrCond) err = symlen = -1;
+		set_fs(old_fs);
+		if (symlen > 0) {
+			sym[symlen] = 0;
+			err = vfsub_symlink(hidden_dir, hidden_dst, sym, mode,
+					    dlgt);
+			//if (LktrCond)
+			//{vfs_unlink(hidden_dir, hidden_dst); err = -1;}
+		}
+		__putname(sym);
+		break;
+	case S_IFCHR:
+	case S_IFBLK:
+		DEBUG_ON(!capable(CAP_MKNOD));
+		/*FALLTHROUGH*/
+	case S_IFIFO:
+	case S_IFSOCK:
+		err = vfsub_mknod(hidden_dir, hidden_dst, mode,
+				  hidden_inode->i_rdev, dlgt);
+		//if (LktrCond) {vfs_unlink(hidden_dir, hidden_dst); err = -1;}
+		break;
+	default:
+		IOErr("Unknown inode type 0%o\n", mode);
+		err = -EIO;
+	}
+
+	if (do_dt)
+		dtime_revert(&dt, flags & CPUP_LOCKED_GHDIR);
+	//dput(parent);
+	//dput(hidden_parent);
+	TraceErr(err);
+	return err;
+}
+
+/*
+ * copyup the @dentry from @bsrc to @bdst.
+ * the caller must set the both of hidden dentries.
+ * @len is for trucating when it is -1 copyup the entire file.
+ */
+int cpup_single(struct dentry *dentry, aufs_bindex_t bdst, aufs_bindex_t bsrc,
+		loff_t len, unsigned int flags)
+{
+	int err, rerr, isdir, dlgt;
+	struct dentry *hidden_src, *hidden_dst, *parent;//, *h_parent;
+	struct inode *dst_inode, *hidden_dir, *inode, *src_inode;
+	struct super_block *sb;
+	aufs_bindex_t old_ibstart;
+	struct dtime dt;
+
+	LKTRTrace("%.*s, i%lu, bdst %d, bsrc %d, len %Ld, flags 0x%x\n",
+		  DLNPair(dentry), dentry->d_inode->i_ino, bdst, bsrc, len,
+		  flags);
+	sb = dentry->d_sb;
+	DEBUG_ON(bsrc <= bdst);
+	hidden_dst = au_h_dptr_i(dentry, bdst);
+	DEBUG_ON(!hidden_dst || hidden_dst->d_inode);
+	//h_parent = dget_parent(hidden_dst);
+	//hidden_dir = h_parent->d_inode;
+	hidden_dir = hidden_dst->d_parent->d_inode;
+	IMustLock(hidden_dir);
+	hidden_src = au_h_dptr_i(dentry, bsrc);
+	DEBUG_ON(!hidden_src || !hidden_src->d_inode);
+	inode = dentry->d_inode;
+	IiMustWriteLock(inode);
+
+	dlgt = need_dlgt(sb);
+	dst_inode = au_h_iptr_i(inode, bdst);
+	if (unlikely(dst_inode)) {
+		if (unlikely(!au_flag_test(sb, AuFlag_PLINK))) {
+			err = -EIO;
+			IOErr("i%lu exists on a upper branch "
+			      "but plink is disabled\n", inode->i_ino);
+			goto out;
+		}
+
+		if (dst_inode->i_nlink) {
+			hidden_src = lkup_plink(sb, bdst, inode);
+			err = PTR_ERR(hidden_src);
+			if (IS_ERR(hidden_src))
+				goto out;
+			DEBUG_ON(!hidden_src->d_inode);
+			// vfs_link() does lock the inode
+			err = vfsub_link(hidden_src, hidden_dir, hidden_dst, dlgt);
+			dput(hidden_src);
+			goto out;
+		} else
+			/* udba work */
+			au_update_brange(inode, 1);
+	}
+
+	old_ibstart = ibstart(inode);
+	err = cpup_entry(dentry, bdst, bsrc, len, flags, dlgt);
+	if (unlikely(err))
+		goto out;
+	dst_inode = hidden_dst->d_inode;
+	hi_lock_child2(dst_inode);
+
+	//todo: test dlgt
+	err = cpup_iattr(hidden_dst, hidden_src, dlgt);
+	//if (LktrCond) err = -1;
+#if 0 // xattr
+	if (0 && !err)
+		err = cpup_xattrs(hidden_src, hidden_dst);
+#endif
+	isdir = S_ISDIR(dst_inode->i_mode);
+	if (!err) {
+		if (bdst < old_ibstart)
+			set_ibstart(inode, bdst);
+		set_h_iptr(inode, bdst, igrab(dst_inode),
+			   au_hi_flags(inode, isdir));
+		i_unlock(dst_inode);
+		src_inode = hidden_src->d_inode;
+		if (!isdir) {
+			if (src_inode->i_nlink > 1
+			    && au_flag_test(sb, AuFlag_PLINK))
+				append_plink(sb, inode, hidden_dst, bdst);
+			else {
+				/* braces are added to stop a warning */
+				;//xino_write0(sb, bsrc, src_inode->i_ino);
+				/* ignore this error */
+			}
+		}
+		//goto out; /* success */
+		return 0; /* success */
+	}
+
+	/* revert */
+	i_unlock(dst_inode);
+	parent = dget_parent(dentry);
+	//dtime_store(&dt, parent, h_parent);
+	dtime_store(&dt, parent, hidden_dst->d_parent);
+	dput(parent);
+	if (!isdir)
+		rerr = vfsub_unlink(hidden_dir, hidden_dst, dlgt);
+	else
+		rerr = vfsub_rmdir(hidden_dir, hidden_dst, dlgt);
+	//rerr = -1;
+	dtime_revert(&dt, flags & CPUP_LOCKED_GHDIR);
+	if (rerr) {
+		IOErr("failed removing broken entry(%d, %d)\n", err, rerr);
+		err = -EIO;
+	}
+
+ out:
+	//dput(h_parent);
+	TraceErr(err);
+	return err;
+}
+
+struct cpup_single_args {
+	int *errp;
+	struct dentry *dentry;
+	aufs_bindex_t bdst, bsrc;
+	loff_t len;
+	unsigned int flags;
+};
+
+static void call_cpup_single(void *args)
+{
+	struct cpup_single_args *a = args;
+	*a->errp = cpup_single(a->dentry, a->bdst, a->bsrc, a->len, a->flags);
+}
+
+int sio_cpup_single(struct dentry *dentry, aufs_bindex_t bdst,
+		    aufs_bindex_t bsrc, loff_t len, unsigned int flags)
+{
+	int err;
+	struct dentry *hidden_dentry;
+	umode_t mode;
+
+	LKTRTrace("%.*s, i%lu, bdst %d, bsrc %d, len %Ld, flags 0x%x\n",
+		  DLNPair(dentry), dentry->d_inode->i_ino, bdst, bsrc, len,
+		  flags);
+
+	hidden_dentry = au_h_dptr_i(dentry, bsrc);
+	mode = hidden_dentry->d_inode->i_mode & S_IFMT;
+	if ((mode != S_IFCHR && mode != S_IFBLK)
+	    || capable(CAP_MKNOD))
+		err = cpup_single(dentry, bdst, bsrc, len, flags);
+	else {
+		struct cpup_single_args args = {
+			.errp	= &err,
+			.dentry	= dentry,
+			.bdst	= bdst,
+			.bsrc	= bsrc,
+			.len	= len,
+			.flags	= flags
+		};
+		au_wkq_wait(call_cpup_single, &args, /*dlgt*/0);
+	}
+
+	TraceErr(err);
+	return err;
+}
+
+/*
+ * copyup the @dentry from the first active hidden branch to @bdst,
+ * using cpup_single().
+ */
+int cpup_simple(struct dentry *dentry, aufs_bindex_t bdst, loff_t len,
+		unsigned int flags)
+{
+	int err;
+	struct inode *inode;
+	aufs_bindex_t bsrc, bend;
+
+	LKTRTrace("%.*s, bdst %d, len %Ld, flags 0x%x\n",
+		  DLNPair(dentry), bdst, len, flags);
+	inode = dentry->d_inode;
+	DEBUG_ON(!S_ISDIR(inode->i_mode) && dbstart(dentry) < bdst);
+
+	bend = dbend(dentry);
+	for (bsrc = bdst + 1; bsrc <= bend; bsrc++)
+		if (au_h_dptr_i(dentry, bsrc))
+			break;
+	DEBUG_ON(!au_h_dptr_i(dentry, bsrc));
+
+	err = lkup_neg(dentry, bdst);
+	//err = -1;
+	if (!err) {
+		err = cpup_single(dentry, bdst, bsrc, len, flags);
+		if (!err)
+			return 0; /* success */
+
+		/* revert */
+		set_h_dptr(dentry, bdst, NULL);
+		set_dbstart(dentry, bsrc);
+	}
+
+	TraceErr(err);
+	return err;
+}
+
+struct cpup_simple_args {
+	int *errp;
+	struct dentry *dentry;
+	aufs_bindex_t bdst;
+	loff_t len;
+	unsigned int flags;
+};
+
+static void call_cpup_simple(void *args)
+{
+	struct cpup_simple_args *a = args;
+	*a->errp = cpup_simple(a->dentry, a->bdst, a->len, a->flags);
+}
+
+int sio_cpup_simple(struct dentry *dentry, aufs_bindex_t bdst, loff_t len,
+		    unsigned int flags)
+{
+	int err, do_sio, dlgt;
+	//struct dentry *parent;
+	struct inode *hidden_dir, *dir;
+
+	LKTRTrace("%.*s, b%d, len %Ld, flags 0x%x\n",
+		  DLNPair(dentry), bdst, len, flags);
+
+	//parent = dget_parent(dentry);
+	//dir = parent->d_inode;
+	dir = dentry->d_parent->d_inode;
+	hidden_dir = au_h_iptr_i(dir, bdst);
+	dlgt = need_dlgt(dir->i_sb);
+	do_sio = au_test_perm(hidden_dir, MAY_EXEC | MAY_WRITE, dlgt);
+	if (!do_sio) {
+		umode_t mode = dentry->d_inode->i_mode & S_IFMT;
+		do_sio = ((mode == S_IFCHR || mode == S_IFBLK)
+			  && !capable(CAP_MKNOD));
+	}
+	if (!do_sio)
+		err = cpup_simple(dentry, bdst, len, flags);
+	else {
+		struct cpup_simple_args args = {
+			.errp	= &err,
+			.dentry	= dentry,
+			.bdst	= bdst,
+			.len	= len,
+			.flags	= flags
+		};
+		au_wkq_wait(call_cpup_simple, &args, /*dlgt*/0);
+	}
+
+	//dput(parent);
+	TraceErr(err);
+	return err;
+}
+
+//todo: dcsub
+/* cf. revalidate function in file.c */
+int cpup_dirs(struct dentry *dentry, aufs_bindex_t bdst, struct dentry *locked)
+{
+	int err;
+	struct super_block *sb;
+	struct dentry *d, *parent, *hidden_parent;
+	unsigned int udba;
+
+	LKTRTrace("%.*s, b%d, parent i%lu, locked %p\n",
+		  DLNPair(dentry), bdst, parent_ino(dentry), locked);
+	sb = dentry->d_sb;
+	DEBUG_ON(test_ro(sb, bdst, NULL));
+	parent = dentry->d_parent;
+	IiMustWriteLock(parent->d_inode);
+	if (unlikely(IS_ROOT(parent)))
+		return 0;
+	if (locked) {
+		DiMustAnyLock(locked);
+		IiMustAnyLock(locked->d_inode);
+	}
+
+	/* slow loop, keep it simple and stupid */
+	err = 0;
+	udba = au_flag_test(sb, AuFlag_UDBA_INOTIFY);
+	while (1) {
+		parent = dentry->d_parent; // dget_parent()
+		hidden_parent = au_h_dptr_i(parent, bdst);
+		if (hidden_parent)
+			return 0; /* success */
+
+		/* find top dir which is needed to cpup */
+		do {
+			d = parent;
+			parent = d->d_parent; // dget_parent()
+			if (parent != locked)
+				di_read_lock_parent3(parent, !AUFS_I_RLOCK);
+			hidden_parent = au_h_dptr_i(parent, bdst);
+			if (parent != locked)
+				di_read_unlock(parent, !AUFS_I_RLOCK);
+		} while (!hidden_parent);
+
+		if (d != dentry->d_parent)
+			di_write_lock_child3(d);
+
+		/* somebody else might create while we were sleeping */
+		if (!au_h_dptr_i(d, bdst) || !au_h_dptr_i(d, bdst)->d_inode) {
+			struct inode *h_dir = hidden_parent->d_inode,
+				*dir = parent->d_inode,
+				*h_gdir, *gdir;
+
+			if (au_h_dptr_i(d, bdst))
+				au_update_dbstart(d);
+			//DEBUG_ON(dbstart(d) <= bdst);
+			if (parent != locked)
+				di_read_lock_parent3(parent, AUFS_I_RLOCK);
+			h_gdir = gdir = NULL;
+			if (unlikely(udba && !IS_ROOT(parent))) {
+				gdir = parent->d_parent->d_inode;
+				h_gdir = hidden_parent->d_parent->d_inode;
+				hgdir_lock(h_gdir, gdir, bdst);
+			}
+			hdir_lock(h_dir, dir, bdst);
+			err = sio_cpup_simple(d, bdst, -1,
+					      au_flags_cpup(CPUP_DTIME,
+							    parent));
+			//if (LktrCond) err = -1;
+			hdir_unlock(h_dir, dir, bdst);
+			if (unlikely(gdir))
+				hdir_unlock(h_gdir, gdir, bdst);
+			if (parent != locked)
+				di_read_unlock(parent, AUFS_I_RLOCK);
+		}
+
+		if (d != dentry->d_parent)
+			di_write_unlock(d);
+		if (unlikely(err))
+			break;
+	}
+
+// out:
+	TraceErr(err);
+	return err;
+}
+
+int test_and_cpup_dirs(struct dentry *dentry, aufs_bindex_t bdst,
+		       struct dentry *locked)
+{
+	int err;
+	struct dentry *parent;
+	struct inode *dir;
+
+	parent = dentry->d_parent;
+	dir = parent->d_inode;
+	LKTRTrace("%.*s, b%d, parent i%lu, locked %p\n",
+		  DLNPair(dentry), bdst, dir->i_ino, locked);
+	DiMustReadLock(parent);
+	IiMustReadLock(dir);
+
+	if (au_h_iptr_i(dir, bdst))
+		return 0;
+
+	err = 0;
+	di_read_unlock(parent, AUFS_I_RLOCK);
+	di_write_lock_parent(parent);
+	if (au_h_iptr_i(dir, bdst))
+		goto out;
+
+	err = cpup_dirs(dentry, bdst, locked);
+
+ out:
+	di_downgrade_lock(parent, AUFS_I_RLOCK);
+	TraceErr(err);
+	return err;
+}
diff --git a/fs/aufs/cpup.h b/fs/aufs/cpup.h
new file mode 100755
index 0000000..86557aa
--- /dev/null
+++ b/fs/aufs/cpup.h
@@ -0,0 +1,72 @@
+/*
+ * Copyright (C) 2005, 2006, 2007 Junjiro Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+/* $Id: cpup.h,v 1.15 2007/05/14 03:41:52 sfjro Exp $ */
+
+#ifndef __AUFS_CPUP_H__
+#define __AUFS_CPUP_H__
+
+#ifdef __KERNEL__
+
+#include <linux/fs.h>
+#include <linux/version.h>
+#include <linux/aufs_type.h>
+
+static inline
+void au_cpup_attr_blksize(struct inode *inode, struct inode *h_inode)
+{
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,19)
+	inode->i_blksize = h_inode->i_blksize;
+#endif
+}
+
+void au_cpup_attr_timesizes(struct inode *inode);
+void au_cpup_attr_nlink(struct inode *inode);
+void au_cpup_attr_changable(struct inode *inode);
+void au_cpup_igen(struct inode *inode, struct inode *h_inode);
+void au_cpup_attr_all(struct inode *inode);
+
+#define CPUP_DTIME		1	// do dtime_store/revert
+// todo: remove this
+#define CPUP_LOCKED_GHDIR	2	// grand parent hidden dir is locked
+unsigned int au_flags_cpup(unsigned int init, struct dentry *parent);
+
+int cpup_single(struct dentry *dentry, aufs_bindex_t bdst, aufs_bindex_t bsrc,
+		loff_t len, unsigned int flags);
+int sio_cpup_single(struct dentry *dentry, aufs_bindex_t bdst,
+		    aufs_bindex_t bsrc, loff_t len, unsigned int flags);
+int cpup_simple(struct dentry *dentry, aufs_bindex_t bdst, loff_t len,
+		unsigned int flags);
+int sio_cpup_simple(struct dentry *dentry, aufs_bindex_t bdst, loff_t len,
+		    unsigned int flags);
+
+int cpup_dirs(struct dentry *dentry, aufs_bindex_t bdst, struct dentry *locked);
+int test_and_cpup_dirs(struct dentry *dentry, aufs_bindex_t bdst,
+		       struct dentry *locked);
+
+/* keep timestamps when copyup */
+struct dtime {
+	struct dentry *dt_dentry, *dt_h_dentry;
+	struct timespec dt_atime, dt_mtime;
+};
+void dtime_store(struct dtime *dt, struct dentry *dentry,
+		 struct dentry *h_dentry);
+void dtime_revert(struct dtime *dt, int h_parent_is_locked);
+
+#endif /* __KERNEL__ */
+#endif /* __AUFS_CPUP_H__ */
diff --git a/fs/aufs/dcsub.c b/fs/aufs/dcsub.c
new file mode 100755
index 0000000..6ec29d3
--- /dev/null
+++ b/fs/aufs/dcsub.c
@@ -0,0 +1,175 @@
+/*
+ * Copyright (C) 2007 Junjiro Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+/* $Id: dcsub.c,v 1.3 2007/05/14 03:41:52 sfjro Exp $ */
+
+#include "aufs.h"
+
+static void au_dpage_free(struct au_dpage *dpage)
+{
+	int i;
+
+	TraceEnter();
+	DEBUG_ON(!dpage);
+
+	for (i = 0; i < dpage->ndentry; i++)
+		dput(dpage->dentries[i]);
+	free_page((unsigned long)dpage->dentries);
+}
+
+int au_dpages_init(struct au_dcsub_pages *dpages, gfp_t gfp)
+{
+	int err;
+	void *p;
+
+	TraceEnter();
+
+	err = -ENOMEM;
+	dpages->dpages = kmalloc(sizeof(*dpages->dpages), gfp);
+	if (unlikely(!dpages->dpages))
+		goto out;
+	p = (void*)__get_free_page(gfp);
+	if (unlikely(!p))
+		goto out_dpages;
+	dpages->dpages[0].ndentry = 0;
+	dpages->dpages[0].dentries = p;
+	dpages->ndpage = 1;
+	return 0; /* success */
+
+ out_dpages:
+	kfree(dpages->dpages);
+ out:
+	TraceErr(err);
+	return err;
+}
+
+void au_dpages_free(struct au_dcsub_pages *dpages)
+{
+	int i;
+
+	TraceEnter();
+
+	for (i = 0; i < dpages->ndpage; i++)
+		au_dpage_free(dpages->dpages + i);
+	kfree(dpages->dpages);
+}
+
+static int au_dpages_append(struct au_dcsub_pages *dpages,
+			    struct dentry *dentry, gfp_t gfp)
+{
+	int err, sz;
+	struct au_dpage *dpage;
+	void *p;
+
+	//TraceEnter();
+
+	dpage = dpages->dpages + dpages->ndpage - 1;
+	DEBUG_ON(!dpage);
+	sz = PAGE_SIZE/sizeof(dentry);
+	if (unlikely(dpage->ndentry >= sz)) {
+		LKTRLabel(new dpage);
+		err = -ENOMEM;
+		sz = dpages->ndpage * sizeof(*dpages->dpages);
+		p = au_kzrealloc(dpages->dpages, sz,
+				 sz + sizeof(*dpages->dpages), gfp);
+		if (unlikely(!p))
+			goto out;
+		dpage = dpages->dpages + dpages->ndpage;
+		p = (void*)__get_free_page(gfp);
+		if (unlikely(!p))
+			goto out;
+		dpage->ndentry = 0;
+		dpage->dentries = p;
+		dpages->ndpage++;
+	}
+
+	dpage->dentries[dpage->ndentry++] = dget(dentry);
+	return 0; /* success */
+
+ out:
+	//TraceErr(err);
+	return err;
+}
+
+int au_dcsub_pages(struct au_dcsub_pages *dpages, struct dentry *root,
+		   au_dpages_test test, void *arg)
+{
+	int err;
+	struct dentry *this_parent = root;
+	struct list_head *next;
+	struct super_block *sb = root->d_sb;
+
+	TraceEnter();
+
+	err = 0;
+	spin_lock(&dcache_lock);
+ repeat:
+	next = this_parent->d_subdirs.next;
+ resume:
+	if (this_parent->d_sb == sb
+	    && !IS_ROOT(this_parent)
+	    && atomic_read(&this_parent->d_count)
+	    && this_parent->d_inode
+	    && (!test || test(this_parent, arg))) {
+		err = au_dpages_append(dpages, this_parent, GFP_ATOMIC);
+		if (unlikely(err))
+			goto out;
+	}
+
+	while (next != &this_parent->d_subdirs) {
+		struct list_head *tmp = next;
+		struct dentry *dentry = list_entry(tmp, struct dentry, D_CHILD);
+		next = tmp->next;
+		if (unlikely(/*d_unhashed(dentry) || */!dentry->d_inode))
+			continue;
+		if (!list_empty(&dentry->d_subdirs)) {
+			this_parent = dentry;
+			goto repeat;
+		}
+		if (dentry->d_sb == sb
+		    && atomic_read(&dentry->d_count)
+		    && (!test || test(dentry, arg))) {
+			err = au_dpages_append(dpages, dentry, GFP_ATOMIC);
+			if (unlikely(err))
+				goto out;
+		}
+	}
+
+	if (this_parent != root) {
+		next = this_parent->D_CHILD.next;
+		this_parent = this_parent->d_parent;
+		goto resume;
+	}
+ out:
+	spin_unlock(&dcache_lock);
+#if 0
+	if (!err) {
+		int i, j;
+		j = 0;
+		for (i = 0; i < dpages->ndpage; i++) {
+			if ((dpages->dpages + i)->ndentry)
+				Dbg("%d: %d\n", i, (dpages->dpages + i)->ndentry);
+			j += (dpages->dpages + i)->ndentry;
+		}
+		if (j)
+			Dbg("ndpage %d, %d\n", dpages->ndpage, j);
+	}
+#endif
+	TraceErr(err);
+	return err;
+}
diff --git a/fs/aufs/dcsub.h b/fs/aufs/dcsub.h
new file mode 100755
index 0000000..0ba034b
--- /dev/null
+++ b/fs/aufs/dcsub.h
@@ -0,0 +1,47 @@
+/*
+ * Copyright (C) 2007 Junjiro Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+/* $Id: dcsub.h,v 1.2 2007/05/14 03:41:52 sfjro Exp $ */
+
+#ifndef __AUFS_DCSUB_H__
+#define __AUFS_DCSUB_H__
+
+#ifdef __KERNEL__
+
+#include <linux/dcache.h>
+
+struct au_dpage {
+	int ndentry;
+	struct dentry **dentries;
+};
+
+struct au_dcsub_pages {
+	int ndpage;
+	struct au_dpage *dpages;
+};
+
+/* ---------------------------------------------------------------------- */
+
+int au_dpages_init(struct au_dcsub_pages *dpages, gfp_t gfp);
+void au_dpages_free(struct au_dcsub_pages *dpages);
+typedef int (*au_dpages_test)(struct dentry *dentry, void *arg);
+int au_dcsub_pages(struct au_dcsub_pages *dpages, struct dentry *root,
+		   au_dpages_test test, void *arg);
+
+#endif /* __KERNEL__ */
+#endif /* __AUFS_DCSUB_H__ */
diff --git a/fs/aufs/debug.c b/fs/aufs/debug.c
new file mode 100755
index 0000000..99d158b
--- /dev/null
+++ b/fs/aufs/debug.c
@@ -0,0 +1,262 @@
+/*
+ * Copyright (C) 2005, 2006, 2007 Junjiro Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+/* $Id: debug.c,v 1.27 2007/04/30 05:48:23 sfjro Exp $ */
+
+#include "aufs.h"
+
+atomic_t aufs_cond = ATOMIC_INIT(0);
+
+#if defined(CONFIG_LKTR) || defined(CONFIG_LKTR_MODULE)
+#define dpri(fmt, arg...) \
+	do {if (LktrCond) printk(KERN_DEBUG fmt, ##arg);} while (0)
+#else
+#define dpri(fmt, arg...)	printk(KERN_DEBUG fmt, ##arg)
+#endif
+
+/* ---------------------------------------------------------------------- */
+
+void au_dpri_whlist(struct aufs_nhash *whlist)
+{
+	int i;
+	struct hlist_head *head;
+	struct aufs_wh *tpos;
+	struct hlist_node *pos;
+
+	for (i = 0; i < AUFS_NHASH_SIZE; i++) {
+		head = whlist->heads + i;
+		hlist_for_each_entry(tpos, pos, head, wh_hash)
+			dpri("b%d, %.*s, %d\n",
+			     tpos->wh_bindex,
+			     tpos->wh_str.len, tpos->wh_str.name,
+			     tpos->wh_str.len);
+	}
+}
+
+void au_dpri_vdir(struct aufs_vdir *vdir)
+{
+	int i;
+	union aufs_deblk_p p;
+	unsigned char *o;
+
+	if (!vdir || IS_ERR(vdir)) {
+		dpri("err %ld\n", PTR_ERR(vdir));
+		return;
+	}
+
+	dpri("nblk %d, deblk %p %d, last{%d, %p}, ver %lu\n",
+	     vdir->vd_nblk, vdir->vd_deblk, ksize(vdir->vd_deblk),
+	     vdir->vd_last.i, vdir->vd_last.p.p, vdir->vd_version);
+	for (i = 0; i < vdir->vd_nblk; i++) {
+		p.deblk = vdir->vd_deblk[i];
+		o = p.p;
+		dpri("[%d]: %p %d\n", i, o, ksize(o));
+#if 0 // verbose
+		int j;
+		for (j = 0; j < 8; j++) {
+			dpri("%p(+%d) {%02x %02x %02x %02x %02x %02x %02x %02x "
+			     "%02x %02x %02x %02x %02x %02x %02x %02x}\n",
+			     p.p, p.p - o,
+			     p.p[0], p.p[1], p.p[2], p.p[3],
+			     p.p[4], p.p[5], p.p[6], p.p[7],
+			     p.p[8], p.p[9], p.p[10], p.p[11],
+			     p.p[12], p.p[13], p.p[14], p.p[15]);
+			p.p += 16;
+		}
+#endif
+	}
+}
+
+static int do_pri_inode(aufs_bindex_t bindex, struct inode *inode)
+{
+	if (!inode || IS_ERR(inode)) {
+		dpri("i%d: err %ld\n", bindex, PTR_ERR(inode));
+		return -1;
+	}
+
+	/* the type of i_blocks depends upon CONFIG_LSF */
+	BUILD_BUG_ON(sizeof(inode->i_blocks) != sizeof(unsigned long)
+		     && sizeof(inode->i_blocks) != sizeof(u64));
+	dpri("i%d: i%lu, %s, cnt %d, nl %u, 0%o, sz %Lu, blk %Lu,"
+	     " ct %Ld, np %lu, st 0x%lx, g %x\n",
+	     bindex,
+	     inode->i_ino, inode->i_sb ? au_sbtype(inode->i_sb) : "??",
+	     atomic_read(&inode->i_count), inode->i_nlink, inode->i_mode,
+	     i_size_read(inode), (u64)inode->i_blocks,
+	     timespec_to_ns(&inode->i_ctime) & 0x0ffff,
+	     inode->i_mapping ? inode->i_mapping->nrpages : 0,
+	     inode->i_state, inode->i_generation);
+	return 0;
+}
+
+void au_dpri_inode(struct inode *inode)
+{
+	struct aufs_iinfo *iinfo;
+	aufs_bindex_t bindex;
+	int err;
+
+	err = do_pri_inode(-1, inode);
+	if (err || !au_is_aufs(inode->i_sb))
+		return;
+
+	iinfo = itoii(inode);
+	if (!iinfo)
+		return;
+	dpri("i-1: bstart %d, bend %d, gen %d\n",
+	     iinfo->ii_bstart, iinfo->ii_bend, au_iigen(inode));
+	if (iinfo->ii_bstart < 0)
+		return;
+	for (bindex = iinfo->ii_bstart; bindex <= iinfo->ii_bend; bindex++)
+		do_pri_inode(bindex, iinfo->ii_hinode[0 + bindex].hi_inode);
+}
+
+static int do_pri_dentry(aufs_bindex_t bindex, struct dentry *dentry)
+{
+	if (!dentry || IS_ERR(dentry)) {
+		dpri("d%d: err %ld\n", bindex, PTR_ERR(dentry));
+		return -1;
+	}
+	dpri("d%d: %.*s/%.*s, %s, cnt %d, flags 0x%x\n",
+	     bindex,
+	     DLNPair(dentry->d_parent), DLNPair(dentry),
+	     dentry->d_sb ? au_sbtype(dentry->d_sb) : "??",
+	     atomic_read(&dentry->d_count), dentry->d_flags);
+	do_pri_inode(bindex, dentry->d_inode);
+	return 0;
+}
+
+void au_dpri_dentry(struct dentry *dentry)
+{
+	struct aufs_dinfo *dinfo;
+	aufs_bindex_t bindex;
+	int err;
+
+	err = do_pri_dentry(-1, dentry);
+	if (err || !au_is_aufs(dentry->d_sb))
+		return;
+
+	dinfo = dtodi(dentry);
+	if (!dinfo)
+		return;
+	dpri("d-1: bstart %d, bend %d, bwh %d, bdiropq %d, gen %d\n",
+	     dinfo->di_bstart, dinfo->di_bend,
+	     dinfo->di_bwh, dinfo->di_bdiropq, au_digen(dentry));
+	if (dinfo->di_bstart < 0)
+		return;
+	for (bindex = dinfo->di_bstart; bindex <= dinfo->di_bend; bindex++)
+		do_pri_dentry(bindex, dinfo->di_hdentry[0 + bindex].hd_dentry);
+}
+
+static int do_pri_file(aufs_bindex_t bindex, struct file *file)
+{
+	char a[32];
+
+	if (!file || IS_ERR(file)) {
+		dpri("f%d: err %ld\n", bindex, PTR_ERR(file));
+		return -1;
+	}
+	a[0] = 0;
+	if (bindex == -1 && ftofi(file))
+		snprintf(a, sizeof(a), ", mmapped %d", au_is_mmapped(file));
+	dpri("f%d: mode 0x%x, flags 0%o, cnt %d, pos %Lu%s\n",
+	     bindex, file->f_mode, file->f_flags, file_count(file),
+	     file->f_pos, a);
+	do_pri_dentry(bindex, file->f_dentry);
+	return 0;
+}
+
+void au_dpri_file(struct file *file)
+{
+	struct aufs_finfo *finfo;
+	aufs_bindex_t bindex;
+	int err;
+
+	err = do_pri_file(-1, file);
+	if (err || !file->f_dentry || !au_is_aufs(file->f_dentry->d_sb))
+		return;
+
+	finfo = ftofi(file);
+	if (!finfo)
+		return;
+	if (finfo->fi_bstart < 0)
+		return;
+	for (bindex = finfo->fi_bstart; bindex <= finfo->fi_bend; bindex++) {
+		struct aufs_hfile *hf;
+		//dpri("bindex %d\n", bindex);
+		hf = finfo->fi_hfile + bindex;
+		do_pri_file(bindex, hf ? hf->hf_file : NULL);
+	}
+}
+
+static int do_pri_br(aufs_bindex_t bindex, struct aufs_branch *br)
+{
+	struct vfsmount *mnt;
+	struct super_block *sb;
+
+	if (!br || IS_ERR(br)
+	    || !(mnt = br->br_mnt) || IS_ERR(mnt)
+	    || !(sb = mnt->mnt_sb) || IS_ERR(sb)) {
+		dpri("s%d: err %ld\n", bindex, PTR_ERR(br));
+		return -1;
+	}
+
+	dpri("s%d: {perm 0x%x, cnt %d}, "
+	     "%s, flags 0x%lx, cnt(BIAS) %d, active %d, xino %p %p\n",
+	     bindex, br->br_perm, br_count(br),
+	     au_sbtype(sb), sb->s_flags, sb->s_count - S_BIAS,
+	     atomic_read(&sb->s_active), br->br_xino,
+	     br->br_xino ? br->br_xino->f_dentry : NULL);
+	return 0;
+}
+
+void au_dpri_sb(struct super_block *sb)
+{
+	struct aufs_sbinfo *sbinfo;
+	aufs_bindex_t bindex;
+	int err;
+	struct vfsmount mnt = {.mnt_sb = sb};
+	struct aufs_branch fake = {
+		.br_perm = 0,
+		.br_mnt = &mnt,
+		.br_count = ATOMIC_INIT(0),
+		.br_xino = NULL
+	};
+
+	atomic_set(&fake.br_count, 0);
+	err = do_pri_br(-1, &fake);
+	dpri("dev 0x%x\n", sb->s_dev);
+	if (err || !au_is_aufs(sb))
+		return;
+
+	sbinfo = stosi(sb);
+	if (!sbinfo)
+		return;
+	for (bindex = 0; bindex <= sbinfo->si_bend; bindex++) {
+		//dpri("bindex %d\n", bindex);
+		do_pri_br(bindex, sbinfo->si_branch[0 + bindex]);
+	}
+}
+
+/* ---------------------------------------------------------------------- */
+
+void DbgSleep(int sec)
+{
+	static DECLARE_WAIT_QUEUE_HEAD(wq);
+	Dbg("sleep %d sec\n", sec);
+	wait_event_timeout(wq, 0, sec * HZ);
+}
diff --git a/fs/aufs/debug.h b/fs/aufs/debug.h
new file mode 100755
index 0000000..53f5f6a
--- /dev/null
+++ b/fs/aufs/debug.h
@@ -0,0 +1,129 @@
+/*
+ * Copyright (C) 2005, 2006, 2007 Junjiro Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+/* $Id: debug.h,v 1.31 2007/05/14 03:41:52 sfjro Exp $ */
+
+#ifndef __AUFS_DEBUG_H__
+#define __AUFS_DEBUG_H__
+
+#ifdef __KERNEL__
+
+#include <linux/fs.h>
+
+#ifdef CONFIG_AUFS_DEBUG
+#define DEBUG_ON(a)		BUG_ON(a)
+extern atomic_t aufs_cond;
+#define au_debug_on()		atomic_inc(&aufs_cond)
+#define au_debug_off()		atomic_dec(&aufs_cond)
+#define au_is_debug()		atomic_read(&aufs_cond)
+#else
+#define DEBUG_ON(a)		/* */
+#define au_debug_on()		/* */
+#define au_debug_off()		/* */
+#define au_is_debug()		0
+#endif
+
+#define MtxMustLock(mtx)	DEBUG_ON(!mutex_is_locked(mtx))
+
+/* ---------------------------------------------------------------------- */
+
+/* debug print */
+#if defined(CONFIG_LKTR) || defined(CONFIG_LKTR_MODULE)
+#include <linux/lktr.h>
+#ifdef CONFIG_AUFS_DEBUG
+#undef LktrCond
+#define LktrCond	unlikely((lktr_cond && lktr_cond()) || au_is_debug())
+#endif
+#else
+#define LktrCond			au_is_debug()
+#define LKTRDumpVma(pre, vma, suf)	/* */
+#define LKTRDumpStack()			/* */
+#define LKTRTrace(fmt, args...) do { \
+	if (LktrCond) \
+		Dbg(fmt, ##args); \
+} while (0)
+#define LKTRLabel(label)		LKTRTrace("%s\n", #label)
+#endif /* CONFIG_LKTR */
+
+#define TraceErr(e) do { \
+	if (unlikely((e) < 0)) \
+		LKTRTrace("err %d\n", (int)(e)); \
+} while (0)
+#define TraceErrPtr(p) do { \
+	if (IS_ERR(p)) \
+		LKTRTrace("err %ld\n", PTR_ERR(p)); \
+} while (0)
+#define TraceEnter()	LKTRLabel(enter)
+
+/* dirty macros for debug print, use with "%.*s" and caution */
+#define LNPair(qstr)		(qstr)->len,(qstr)->name
+#define DLNPair(d)		LNPair(&(d)->d_name)
+
+/* ---------------------------------------------------------------------- */
+
+#define Dpri(lvl, fmt, arg...) \
+	printk(lvl AUFS_NAME " %s:%d:%s[%d]: " fmt, \
+	       __func__, __LINE__, current->comm, current->pid, ##arg)
+#define Dbg(fmt, arg...)	Dpri(KERN_DEBUG, fmt, ##arg)
+#define Warn(fmt, arg...)	Dpri(KERN_WARNING, fmt, ##arg)
+#define Warn1(fmt, arg...) do { \
+	static unsigned char c; \
+	if (!c++) Warn(fmt, ##arg); \
+	} while (0)
+#define Err(fmt, arg...)	Dpri(KERN_ERR, fmt, ##arg)
+#define Err1(fmt, arg...) do { \
+	static unsigned char c; \
+	if (!c++) Err(fmt, ##arg); \
+	} while (0)
+#define IOErr(fmt, arg...)	Err("I/O Error, " fmt, ##arg)
+#define IOErr1(fmt, arg...) do { \
+	static unsigned char c; \
+	if (!c++) IOErr(fmt, ##arg); \
+	} while (0)
+#define IOErrWhck(fmt, arg...)	Err("I/O Error, try whck. " fmt, ##arg)
+
+/* ---------------------------------------------------------------------- */
+
+#ifdef CONFIG_AUFS_DEBUG
+struct aufs_nhash;
+void au_dpri_whlist(struct aufs_nhash *whlist);
+struct aufs_vdir;
+void au_dpri_vdir(struct aufs_vdir *vdir);
+void au_dpri_inode(struct inode *inode);
+void au_dpri_dentry(struct dentry *dentry);
+void au_dpri_file(struct file *filp);
+void au_dpri_sb(struct super_block *sb);
+#define DbgWhlist(w)		do{LKTRTrace(#w "\n"); au_dpri_whlist(w);}while(0)
+#define DbgVdir(v)		do{LKTRTrace(#v "\n"); au_dpri_vdir(v);}while(0)
+#define DbgInode(i)		do{LKTRTrace(#i "\n"); au_dpri_inode(i);}while(0)
+#define DbgDentry(d)		do{LKTRTrace(#d "\n"); au_dpri_dentry(d);}while(0)
+#define DbgFile(f)		do{LKTRTrace(#f "\n"); au_dpri_file(f);}while(0)
+#define DbgSb(sb)		do{LKTRTrace(#sb "\n"); au_dpri_sb(sb);}while(0)
+void DbgSleep(int sec);
+#else
+#define DbgWhlist(w)		/* */
+#define DbgVdir(v)		/* */
+#define DbgInode(i)		/* */
+#define DbgDentry(d)		/* */
+#define DbgFile(f)		/* */
+#define DbgSb(sb)		/* */
+#define DbgSleep(sec)		/* */
+#endif
+
+#endif /* __KERNEL__ */
+#endif /* __AUFS_DEBUG_H__ */
diff --git a/fs/aufs/dentry.c b/fs/aufs/dentry.c
new file mode 100755
index 0000000..2acb89b
--- /dev/null
+++ b/fs/aufs/dentry.c
@@ -0,0 +1,946 @@
+/*
+ * Copyright (C) 2005, 2006, 2007 Junjiro Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+/* $Id: dentry.c,v 1.41 2007/05/14 03:38:38 sfjro Exp $ */
+
+//#include <linux/fs.h>
+//#include <linux/namei.h>
+#include "aufs.h"
+
+#ifdef CONFIG_AUFS_LHASH_PATCH
+
+#ifdef CONFIG_AUFS_DLGT
+struct lookup_hash_args {
+	struct dentry **errp;
+	struct qstr *name;
+	struct dentry *base;
+	struct nameidata *nd;
+};
+
+static void call_lookup_hash(void *args)
+{
+	struct lookup_hash_args *a = args;
+	*a->errp = __lookup_hash(a->name, a->base, a->nd);
+}
+#endif /* CONFIG_AUFS_DLGT */
+
+static struct dentry *lkup_hash(const char *name, struct dentry *parent,
+				int len, struct lkup_args *lkup)
+{
+	struct dentry *dentry;
+	char *p;
+	unsigned long hash;
+	struct qstr this;
+	unsigned int c;
+	struct nameidata tmp_nd;
+
+	dentry = ERR_PTR(-EACCES);
+	this.name = name;
+	this.len = len;
+	if (unlikely(!len))
+		goto out;
+
+	p = (void*)name;
+	hash = init_name_hash();
+	while (len--) {
+		c = *p++;
+		if (unlikely(c == '/' || c == '\0'))
+			goto out;
+		hash = partial_name_hash(c, hash);
+	}
+	this.hash = end_name_hash(hash);
+
+	memset(&tmp_nd, 0, sizeof(tmp_nd));
+	tmp_nd.dentry = dget(parent);
+	tmp_nd.mnt = mntget(lkup->nfsmnt);
+#ifndef CONFIG_AUFS_DLGT
+	dentry = __lookup_hash(&this, parent, &tmp_nd);
+#else
+	if (!lkup->dlgt)
+		dentry = __lookup_hash(&this, parent, &tmp_nd);
+	else {
+		struct lookup_hash_args args = {
+			.errp	= &dentry,
+			.name	= &this,
+			.base	= parent,
+			.nd	= &tmp_nd
+		};
+		au_wkq_wait(call_lookup_hash, &args, /*dlgt*/1);
+	}
+#endif
+	path_release(&tmp_nd);
+
+ out:
+	TraceErrPtr(dentry);
+	return dentry;
+}
+#elif defined(CONFIG_AUFS_DLGT)
+static struct dentry *lkup_hash(const char *name, struct dentry *parent,
+				int len, struct lkup_args *lkup)
+{
+	return ERR_PTR(-ENOSYS);
+}
+#endif
+
+#ifdef CONFIG_AUFS_DLGT
+struct lookup_one_len_args {
+	struct dentry **errp;
+	const char *name;
+	struct dentry *parent;
+	int len;
+};
+
+static void call_lookup_one_len(void *args)
+{
+	struct lookup_one_len_args *a = args;
+	*a->errp = lookup_one_len(a->name, a->parent, a->len);
+}
+#endif /* CONFIG_AUFS_DLGT */
+
+#if defined(CONFIG_AUFS_LHASH_PATCH) || defined(CONFIG_AUFS_DLGT)
+/* cf. lookup_one_len() in linux/fs/namei.c */
+struct dentry *lkup_one(const char *name, struct dentry *parent, int len,
+			struct lkup_args *lkup)
+{
+	struct dentry *dentry;
+
+	LKTRTrace("%.*s/%.*s, lkup{%p, %d}\n",
+		  DLNPair(parent), len, name, lkup->nfsmnt, lkup->dlgt);
+
+	if (!lkup->nfsmnt) {
+#ifndef CONFIG_AUFS_DLGT
+		dentry = lookup_one_len(name, parent, len);
+#else
+		if (!lkup->dlgt)
+			dentry = lookup_one_len(name, parent, len);
+		else {
+			struct lookup_one_len_args args = {
+				.errp	= &dentry,
+				.name	= name,
+				.parent	= parent,
+				.len	= len
+			};
+			au_wkq_wait(call_lookup_one_len, &args, /*dlgt*/1);
+		}
+#endif
+	} else
+		dentry = lkup_hash(name, parent, len, lkup);
+
+	TraceErrPtr(dentry);
+	return dentry;
+}
+#endif
+
+struct lkup_one_args {
+	struct dentry **errp;
+	const char *name;
+	struct dentry *parent;
+	int len;
+	struct lkup_args *lkup;
+};
+
+static void call_lkup_one(void *args)
+{
+	struct lkup_one_args *a = args;
+	*a->errp = lkup_one(a->name, a->parent, a->len, a->lkup);
+}
+
+/*
+ * returns positive/negative dentry, NULL or an error.
+ * NULL means whiteout-ed or not-found.
+ */
+static struct dentry *do_lookup(struct dentry *hidden_parent,
+				struct dentry *dentry, aufs_bindex_t bindex,
+				struct qstr *wh_name, int allow_neg,
+				mode_t type, int dlgt)
+{
+	struct dentry *hidden_dentry;
+	int wh_found, wh_able, opq;
+	struct inode *hidden_dir, *hidden_inode;
+	struct qstr *name;
+	struct super_block *sb;
+	struct lkup_args lkup = {.dlgt = dlgt};
+
+	LKTRTrace("%.*s/%.*s, b%d, allow_neg %d, type 0%o, dlgt %d\n",
+		  DLNPair(hidden_parent), DLNPair(dentry), bindex, allow_neg,
+		  type, dlgt);
+	DEBUG_ON(IS_ROOT(dentry));
+	hidden_dir = hidden_parent->d_inode;
+	IMustLock(hidden_dir);
+
+	wh_found = 0;
+	sb = dentry->d_sb;
+	wh_able = sbr_is_whable(sb, bindex);
+	lkup.nfsmnt = au_nfsmnt(sb, bindex);
+	name = &dentry->d_name;
+	if (unlikely(wh_able)) {
+#if 0 //def CONFIG_AUFS_ROBR
+		if (strncmp(name->name, AUFS_WH_PFX, AUFS_WH_PFX_LEN))
+			wh_found = is_wh(hidden_parent, wh_name, /*try_sio*/0,
+					 &lkup);
+		else
+			wh_found = -EPERM;
+#else
+		wh_found = is_wh(hidden_parent, wh_name, /*try_sio*/0, &lkup);
+#endif
+	}
+	//if (LktrCond) wh_found = -1;
+	hidden_dentry = ERR_PTR(wh_found);
+	if (!wh_found)
+		goto real_lookup;
+	if (unlikely(wh_found < 0))
+		goto out;
+
+	/* We found a whiteout */
+	//set_dbend(dentry, bindex);
+	set_dbwh(dentry, bindex);
+	if (!allow_neg)
+		return NULL; /* success */
+
+ real_lookup:
+	// do not superio.
+	hidden_dentry = lkup_one(name->name, hidden_parent, name->len, &lkup);
+	//if (LktrCond) {dput(hidden_dentry); hidden_dentry = ERR_PTR(-1);}
+	if (IS_ERR(hidden_dentry))
+		goto out;
+	DEBUG_ON(d_unhashed(hidden_dentry));
+	hidden_inode = hidden_dentry->d_inode;
+	if (!hidden_inode) {
+		if (!allow_neg)
+			goto out_neg;
+	} else if (wh_found
+		   || (type && type != (hidden_inode->i_mode & S_IFMT)))
+		goto out_neg;
+
+	if (dbend(dentry) <= bindex)
+		set_dbend(dentry, bindex);
+	if (dbstart(dentry) == -1 || bindex < dbstart(dentry))
+		set_dbstart(dentry, bindex);
+	set_h_dptr(dentry, bindex, hidden_dentry);
+
+	if (!hidden_inode || !S_ISDIR(hidden_inode->i_mode) || !wh_able)
+		return hidden_dentry; /* success */
+
+	hi_lock_child(hidden_inode);
+	opq = is_diropq(hidden_dentry, &lkup);
+	//if (LktrCond) opq = -1;
+	i_unlock(hidden_inode);
+	if (opq > 0)
+		set_dbdiropq(dentry, bindex);
+	else if (unlikely(opq < 0)) {
+		set_h_dptr(dentry, bindex, NULL);
+		hidden_dentry = ERR_PTR(opq);
+	}
+	goto out;
+
+ out_neg:
+	dput(hidden_dentry);
+	hidden_dentry = NULL;
+ out:
+	TraceErrPtr(hidden_dentry);
+	return hidden_dentry;
+}
+
+/*
+ * returns the number of hidden positive dentries,
+ * otherwise an error.
+ */
+int lkup_dentry(struct dentry *dentry, aufs_bindex_t bstart, mode_t type)
+{
+	int npositive, err, allow_neg, dlgt;
+	struct dentry *parent;
+	aufs_bindex_t bindex, btail;
+	const struct qstr *name = &dentry->d_name;
+	struct qstr whname;
+	struct super_block *sb;
+
+	LKTRTrace("%.*s, b%d, type 0%o\n", LNPair(name), bstart, type);
+	DEBUG_ON(bstart < 0 || IS_ROOT(dentry));
+	parent = dget_parent(dentry);
+
+#if 1 //ndef CONFIG_AUFS_ROBR
+	err = -EPERM;
+	if (unlikely(!strncmp(name->name, AUFS_WH_PFX, AUFS_WH_PFX_LEN)))
+		goto out;
+#endif
+
+	err = au_alloc_whname(name->name, name->len, &whname);
+	//if (LktrCond) {au_free_whname(&whname); err = -1;}
+	if (unlikely(err))
+		goto out;
+
+	sb = dentry->d_sb;
+	dlgt = need_dlgt(sb);
+	allow_neg = !type;
+	npositive = 0;
+	btail = dbtaildir(parent);
+	for (bindex = bstart; bindex <= btail; bindex++) {
+		struct dentry *hidden_parent, *hidden_dentry;
+		struct inode *hidden_inode;
+		struct inode *hidden_dir;
+
+		hidden_dentry = au_h_dptr_i(dentry, bindex);
+		if (hidden_dentry) {
+			if (hidden_dentry->d_inode)
+				npositive++;
+			if (type != S_IFDIR)
+				break;
+			continue;
+		}
+		hidden_parent = au_h_dptr_i(parent, bindex);
+		if (!hidden_parent)
+			continue;
+		hidden_dir = hidden_parent->d_inode;
+		if (!hidden_dir || !S_ISDIR(hidden_dir->i_mode))
+			continue;
+
+		hi_lock_parent(hidden_dir);
+		hidden_dentry = do_lookup(hidden_parent, dentry, bindex,
+					  &whname, allow_neg, type, dlgt);
+		// do not dput for testing
+		//if (LktrCond) {hidden_dentry = ERR_PTR(-1);}
+		i_unlock(hidden_dir);
+		err = PTR_ERR(hidden_dentry);
+		if (IS_ERR(hidden_dentry))
+			goto out_wh;
+		allow_neg = 0;
+
+		if (dbwh(dentry) != -1)
+			break;
+		if (!hidden_dentry)
+			continue;
+		hidden_inode = hidden_dentry->d_inode;
+		if (!hidden_inode)
+			continue;
+		npositive++;
+		if (!type)
+			type = hidden_inode->i_mode & S_IFMT;
+		if (type != S_IFDIR)
+			break;
+		else if (dbdiropq(dentry) != -1)
+			break;
+	}
+
+	if (npositive) {
+		LKTRLabel(positive);
+		au_update_dbstart(dentry);
+	}
+	err = npositive;
+
+ out_wh:
+	au_free_whname(&whname);
+ out:
+	dput(parent);
+	TraceErr(err);
+	return err;
+}
+
+struct dentry *sio_lkup_one(const char *name, struct dentry *parent, int len,
+			    struct lkup_args *lkup)
+{
+	struct dentry *dentry;
+
+	LKTRTrace("%.*s/%.*s\n", DLNPair(parent), len, name);
+	IMustLock(parent->d_inode);
+
+	if (!au_test_perm(parent->d_inode, MAY_EXEC, lkup->dlgt))
+		dentry = lkup_one(name, parent, len, lkup);
+	else {
+		// ugly
+		int dlgt = lkup->dlgt;
+		struct lkup_one_args args = {
+			.errp	= &dentry,
+			.name	= name,
+			.parent	= parent,
+			.len	= len,
+			.lkup	= lkup
+		};
+
+		lkup->dlgt = 0;
+		au_wkq_wait(call_lkup_one, &args, /*dlgt*/0);
+		lkup->dlgt = dlgt;
+	}
+
+	TraceErrPtr(dentry);
+	return dentry;
+}
+
+/*
+ * lookup @dentry on @bindex which should be negative.
+ */
+int lkup_neg(struct dentry *dentry, aufs_bindex_t bindex)
+{
+	int err;
+	struct dentry *parent, *hidden_parent, *hidden_dentry;
+	struct inode *hidden_dir;
+	struct lkup_args lkup;
+
+	LKTRTrace("%.*s, b%d\n", DLNPair(dentry), bindex);
+	parent = dget_parent(dentry);
+	DEBUG_ON(!parent || !parent->d_inode
+		 || !S_ISDIR(parent->d_inode->i_mode));
+	hidden_parent = au_h_dptr_i(parent, bindex);
+	DEBUG_ON(!hidden_parent);
+	hidden_dir = hidden_parent->d_inode;
+	DEBUG_ON(!hidden_dir || !S_ISDIR(hidden_dir->i_mode));
+	IMustLock(hidden_dir);
+
+	lkup.nfsmnt = au_nfsmnt(dentry->d_sb, bindex);
+	lkup.dlgt = need_dlgt(dentry->d_sb);
+	hidden_dentry = sio_lkup_one(dentry->d_name.name, hidden_parent,
+				     dentry->d_name.len, &lkup);
+	//if (LktrCond) {dput(hidden_dentry); hidden_dentry = ERR_PTR(-1);}
+	err = PTR_ERR(hidden_dentry);
+	if (IS_ERR(hidden_dentry))
+		goto out;
+	if (unlikely(hidden_dentry->d_inode)) {
+		err = -EIO;
+		IOErr("b%d %.*s should be negative.%s\n",
+		      bindex, DLNPair(hidden_dentry),
+		      au_flag_test(dentry->d_sb, AuFlag_UDBA_INOTIFY) ? "" :
+			" Try udba=inotify.");
+		dput(hidden_dentry);
+		goto out;
+	}
+
+	if (bindex < dbstart(dentry))
+		set_dbstart(dentry, bindex);
+	if (dbend(dentry) < bindex)
+		set_dbend(dentry, bindex);
+	set_h_dptr(dentry, bindex, hidden_dentry);
+	err = 0;
+
+ out:
+	dput(parent);
+	TraceErr(err);
+	return err;
+}
+
+/*
+ * returns the number of found hidden positive dentries,
+ * otherwise an error.
+ */
+int au_refresh_hdentry(struct dentry *dentry, mode_t type)
+{
+	int npositive, pgen, new_sz, sgen, dgen;
+	struct aufs_dinfo *dinfo;
+	struct super_block *sb;
+	struct dentry *parent;
+	aufs_bindex_t bindex, parent_bend, parent_bstart, bwh, bdiropq, bend;
+	struct aufs_hdentry *p;
+	//struct nameidata nd;
+
+	LKTRTrace("%.*s, type 0%o\n", DLNPair(dentry), type);
+	DiMustWriteLock(dentry);
+	sb = dentry->d_sb;
+	DEBUG_ON(IS_ROOT(dentry));
+	parent = dget_parent(dentry);
+	pgen = au_digen(parent);
+	sgen = au_sigen(sb);
+	dgen = au_digen(dentry);
+	DEBUG_ON(pgen != sgen);
+
+	npositive = -ENOMEM;
+	new_sz = sizeof(*dinfo->di_hdentry) * (sbend(sb) + 1);
+	dinfo = dtodi(dentry);
+	p = au_kzrealloc(dinfo->di_hdentry, sizeof(*p) * (dinfo->di_bend + 1),
+			 new_sz, GFP_KERNEL);
+	//p = NULL;
+	if (unlikely(!p))
+		goto out;
+	dinfo->di_hdentry = p;
+
+	bend = dinfo->di_bend;
+	bwh = dinfo->di_bwh;
+	bdiropq = dinfo->di_bdiropq;
+	p += dinfo->di_bstart;
+	for (bindex = dinfo->di_bstart; bindex <= bend; bindex++, p++) {
+		struct dentry *hd, *hdp;
+		struct aufs_hdentry tmp, *q;
+		aufs_bindex_t new_bindex;
+
+		hd = p->hd_dentry;
+		if (!hd)
+			continue;
+		hdp = dget_parent(hd);
+		if (hdp == au_h_dptr_i(parent, bindex)) {
+			dput(hdp);
+			continue;
+		}
+
+		new_bindex = au_find_dbindex(parent, hdp);
+		dput(hdp);
+		DEBUG_ON(new_bindex == bindex);
+		if (dinfo->di_bwh == bindex)
+			bwh = new_bindex;
+		if (dinfo->di_bdiropq == bindex)
+			bdiropq = new_bindex;
+		if (new_bindex < 0) { // test here
+			hdput(p);
+			p->hd_dentry = NULL;
+			continue;
+		}
+		/* swap two hidden dentries, and loop again */
+		q = dinfo->di_hdentry + new_bindex;
+		tmp = *q;
+		*q = *p;
+		*p = tmp;
+		if (tmp.hd_dentry) {
+			bindex--;
+			p--;
+		}
+	}
+
+	// test here
+	dinfo->di_bwh = -1;
+	if (unlikely(bwh != -1 && bwh <= sbend(sb) && sbr_is_whable(sb, bwh)))
+		dinfo->di_bwh = bwh;
+	dinfo->di_bdiropq = -1;
+	if (unlikely(bdiropq != -1 && bdiropq <= sbend(sb)
+		     && sbr_is_whable(sb, bdiropq)))
+		dinfo->di_bdiropq = bdiropq;
+	parent_bend = dbend(parent);
+	p = dinfo->di_hdentry;
+	for (bindex = 0; bindex <= parent_bend; bindex++, p++)
+		if (p->hd_dentry) {
+			dinfo->di_bstart = bindex;
+			break;
+		}
+	p = dinfo->di_hdentry + parent_bend;
+	//for (bindex = parent_bend; bindex > dinfo->di_bstart; bindex--, p--)
+	for (bindex = parent_bend; bindex >= 0; bindex--, p--)
+		if (p->hd_dentry) {
+			dinfo->di_bend = bindex;
+			break;
+		}
+
+	npositive = 0;
+	parent_bstart = dbstart(parent);
+	if (type != S_IFDIR && dinfo->di_bstart == parent_bstart)
+		goto out_dgen; /* success */
+
+#if 0
+	nd.last_type = LAST_ROOT;
+	nd.flags = LOOKUP_FOLLOW;
+	nd.depth = 0;
+	nd.mnt = mntget(??);
+	nd.dentry = dget(parent);
+#endif
+	npositive = lkup_dentry(dentry, parent_bstart, type);
+	//if (LktrCond) npositive = -1;
+	if (npositive < 0)
+		goto out;
+
+ out_dgen:
+	au_update_digen(dentry);
+ out:
+	dput(parent);
+	TraceErr(npositive);
+	return npositive;
+}
+
+static int h_d_revalidate(struct dentry *dentry, struct nameidata *nd,
+			  int do_udba)
+{
+	int err, plus, locked, unhashed, is_root, h_plus, is_nfs;
+	struct nameidata fake_nd, *p;
+	aufs_bindex_t bindex, btail, bstart, ibs, ibe;
+	struct super_block *sb;
+	struct inode *inode, *first, *h_inode, *h_cached_inode;
+	umode_t mode, h_mode;
+	struct dentry *h_dentry;
+	int (*reval)(struct dentry *, struct nameidata *);
+	struct qstr *name;
+
+	LKTRTrace("%.*s\n", DLNPair(dentry));
+	inode = dentry->d_inode;
+	DEBUG_ON(inode && au_digen(dentry) != au_iigen(inode));
+	//DbgDentry(dentry);
+	//DbgInode(inode);
+
+	err = 0;
+	sb = dentry->d_sb;
+	plus = 0;
+	mode = 0;
+	first = NULL;
+	ibs = ibe = -1;
+	unhashed = d_unhashed(dentry);
+	is_root = IS_ROOT(dentry);
+	name = &dentry->d_name;
+
+	/*
+	 * Theoretically, REVAL test should be unnecessary in case of INOTIFY.
+	 * But inotify doesn't fire some necessary events,
+	 *	IN_ATTRIB for atime/nlink/pageio
+	 *	IN_DELETE for NFS dentry
+	 * Let's do REVAL test too.
+	 */
+	if (do_udba && inode) {
+		mode = (inode->i_mode & S_IFMT);
+		plus = (inode->i_nlink > 0);
+		first = au_h_iptr(inode);
+		ibs = ibstart(inode);
+		ibe = ibend(inode);
+	}
+
+	btail = bstart = dbstart(dentry);
+	if (inode && S_ISDIR(inode->i_mode))
+		btail = dbtaildir(dentry);
+	locked = 0;
+	if (nd) {
+		fake_nd = *nd;
+#ifndef CONFIG_AUFS_FAKE_DM
+		if (dentry != nd->dentry) {
+			di_read_lock_parent(nd->dentry, 0);
+			locked = 1;
+		}
+#endif
+	}
+	for (bindex = bstart; bindex <= btail; bindex++) {
+		h_dentry = au_h_dptr_i(dentry, bindex);
+		if (unlikely(!h_dentry))
+			continue;
+		if (unlikely(do_udba
+			     && !is_root
+			     && (unhashed != d_unhashed(h_dentry)
+#if 1
+				 || name->len != h_dentry->d_name.len
+				 || memcmp(name->name, h_dentry->d_name.name,
+					   name->len)
+#endif
+				     ))) {
+			LKTRTrace("unhash 0x%x 0x%x, %.*s %.*s\n",
+				  unhashed, d_unhashed(h_dentry),
+				  DLNPair(dentry), DLNPair(h_dentry));
+			goto err;
+		}
+
+		reval = NULL;
+		if (h_dentry->d_op)
+			reval = h_dentry->d_op->d_revalidate;
+		if (unlikely(reval)) {
+			//LKTRLabel(hidden reval);
+			p = fake_dm(&fake_nd, nd, sb, bindex);
+			DEBUG_ON(IS_ERR(p));
+			err = !reval(h_dentry, p);
+			fake_dm_release(p);
+			if (unlikely(err)) {
+				//Dbg("here\n");
+				goto err;
+			}
+		}
+
+		if (unlikely(!do_udba))
+			continue;
+
+		/* UDBA tests */
+		h_inode = h_dentry->d_inode;
+		if (unlikely(!!inode != !!h_inode)) {
+			//Dbg("here\n");
+			goto err;
+		}
+
+		h_plus = plus;
+		h_mode = mode;
+		h_cached_inode = h_inode;
+		is_nfs = 0;
+		if (h_inode) {
+			h_mode = (h_inode->i_mode & S_IFMT);
+			h_plus = (h_inode->i_nlink > 0);
+		}
+		if (inode && ibs <= bindex && bindex <= ibe) {
+			h_cached_inode = au_h_iptr_i(inode, bindex);
+			//is_nfs = au_is_nfs(h_cached_inode->i_sb);
+		}
+
+		LKTRTrace("{%d, 0%o, %p}, h{%d, 0%o, %p}\n",
+			  plus, mode, h_cached_inode,
+			  h_plus, h_mode, h_inode);
+		if (unlikely(plus != h_plus || mode != h_mode
+			     || (h_cached_inode != h_inode /* && !is_nfs */))) {
+			//Dbg("here\n");
+			goto err;
+		}
+		continue;
+
+	err:
+		err = -EINVAL;
+		break;
+	}
+#ifndef CONFIG_AUFS_FAKE_DM
+	if (unlikely(locked))
+		di_read_unlock(nd->dentry, 0);
+#endif
+
+#if 0
+	// some filesystem uses CURRENT_TIME_SEC instead of CURRENT_TIME.
+	// NFS may stop IN_DELETE because of DCACHE_NFSFS_RENAMED.
+#if 0
+		     && (!timespec_equal(&inode->i_ctime, &first->i_ctime)
+			 || !timespec_equal(&inode->i_atime, &first->i_atime))
+#endif
+	if (unlikely(!err && udba && first))
+		au_cpup_attr_all(inode);
+#endif
+
+	TraceErr(err);
+	return err;
+}
+
+static int simple_reval_dpath(struct dentry *dentry, int sgen)
+{
+	int err;
+	mode_t type;
+	struct dentry *parent;
+	struct inode *inode;
+
+	LKTRTrace("%.*s, sgen %d\n", DLNPair(dentry), sgen);
+	SiMustAnyLock(dentry->d_sb);
+	DiMustWriteLock(dentry);
+	inode = dentry->d_inode;
+	DEBUG_ON(!inode);
+
+	if (au_digen(dentry) == sgen)
+		return 0;
+
+	parent = dget_parent(dentry);
+	di_read_lock_parent(parent, AUFS_I_RLOCK);
+	DEBUG_ON(au_digen(parent) != sgen);
+#ifdef CONFIG_AUFS_DEBUG
+	{
+		struct dentry *d = parent;
+		while (!IS_ROOT(d)) {
+			DEBUG_ON(au_digen(d) != sgen);
+			d = d->d_parent;
+		}
+	}
+#endif
+	type = (inode->i_mode & S_IFMT);
+	/* returns a number of positive dentries */
+	err = au_refresh_hdentry(dentry, type);
+	if (err >= 0)
+		err = au_refresh_hinode(inode, dentry);
+	di_read_unlock(parent, AUFS_I_RLOCK);
+	dput(parent);
+	TraceErr(err);
+	return err;
+}
+
+int au_reval_dpath(struct dentry *dentry, int sgen)
+{
+	int err;
+	struct dentry *d, *parent;
+	struct inode *inode;
+
+	LKTRTrace("%.*s, sgen %d\n", DLNPair(dentry), sgen);
+	DEBUG_ON(!dentry->d_inode);
+	DiMustWriteLock(dentry);
+
+	if (!stosi(dentry->d_sb)->si_failed_refresh_dirs)
+		return simple_reval_dpath(dentry, sgen);
+
+	/* slow loop, keep it simple and stupid */
+	/* cf: cpup_dirs() */
+	err = 0;
+	while (au_digen(dentry) != sgen) {
+		d = dentry;
+		while (1) {
+			parent = d->d_parent; // dget_parent()
+			if (au_digen(parent) == sgen)
+				break;
+			d = parent;
+		}
+
+		inode = d->d_inode;
+		if (d != dentry) {
+			//i_lock(inode);
+			di_write_lock_child(d);
+		}
+
+		/* someone might update our dentry while we were sleeping */
+		if (au_digen(d) != sgen) {
+			di_read_lock_parent(parent, AUFS_I_RLOCK);
+			/* returns a number of positive dentries */
+			err = au_refresh_hdentry(d, inode->i_mode & S_IFMT);
+			//err = -1;
+			if (err >= 0)
+				err = au_refresh_hinode(inode, d);
+			//err = -1;
+			di_read_unlock(parent, AUFS_I_RLOCK);
+		}
+
+		if (d != dentry) {
+			di_write_unlock(d);
+			//i_unlock(inode);
+		}
+		if (unlikely(err))
+			break;
+	}
+
+	TraceErr(err);
+	return err;
+}
+
+/*
+ * THIS IS A BOOLEAN FUNCTION: returns 1 if valid, 0 otherwise.
+ * nfsd passes NULL as nameidata.
+ */
+static int aufs_d_revalidate(struct dentry *dentry, struct nameidata *nd)
+{
+	int valid, sgen, err, do_udba;
+	struct super_block *sb;
+	struct inode *inode;
+
+	LKTRTrace("dentry %.*s\n", DLNPair(dentry));
+	if (nd && nd->dentry)
+		LKTRTrace("nd %.*s\n", DLNPair(nd->dentry));
+	//dir case: DEBUG_ON(dentry->d_parent != nd->dentry);
+	//remove failure case: DEBUG_ON(!IS_ROOT(dentry) && d_unhashed(dentry));
+	DEBUG_ON(!dentry->d_fsdata);
+	//DbgDentry(dentry);
+
+	err = -EINVAL;
+	inode = dentry->d_inode;
+	//DbgInode(inode);
+	sb = dentry->d_sb;
+	si_read_lock(sb);
+	sgen = au_sigen(sb);
+	if (au_digen(dentry) == sgen)
+		di_read_lock_child(dentry, !AUFS_I_RLOCK);
+	else {
+		DEBUG_ON(IS_ROOT(dentry));
+#ifdef ForceInotify
+		Dbg("UDBA or digen, %.*s\n", DLNPair(dentry));
+#endif
+		//i_lock(inode);
+		di_write_lock_child(dentry);
+		if (inode)
+			err = au_reval_dpath(dentry, sgen);
+		//err = -1;
+		di_downgrade_lock(dentry, AUFS_I_RLOCK);
+		//i_unlock(inode);
+		if (unlikely(err))
+			goto out;
+		ii_read_unlock(inode);
+		DEBUG_ON(au_iigen(inode) != sgen);
+	}
+
+	if (inode) {
+		if (au_iigen(inode) == sgen)
+			ii_read_lock_child(inode);
+		else {
+			DEBUG_ON(IS_ROOT(dentry));
+#ifdef ForceInotify
+			Dbg("UDBA or survived, %.*s\n", DLNPair(dentry));
+#endif
+			ii_write_lock_child(inode);
+			err = au_refresh_hinode(inode, dentry);
+			ii_downgrade_lock(inode);
+			if (unlikely(err))
+				goto out;
+			DEBUG_ON(au_iigen(inode) != sgen);
+		}
+	}
+
+#if 0 // fix it
+	/* parent dir i_nlink is not updated in the case of setattr */
+	if (S_ISDIR(inode->i_mode)) {
+		i_lock(inode);
+		ii_write_lock(inode);
+		au_cpup_attr_nlink(inode);
+		ii_write_unlock(inode);
+		i_unlock(inode);
+	}
+#endif
+
+	err = -EINVAL;
+	do_udba = !au_flag_test(sb, AuFlag_UDBA_NONE);
+	if (do_udba && inode && ibstart(inode) >= 0
+	    && au_test_higen(inode, au_h_iptr(inode)))
+		goto out;
+	err = h_d_revalidate(dentry, nd, do_udba);
+	//err = -1;
+
+ out:
+	aufs_read_unlock(dentry, AUFS_I_RLOCK);
+	TraceErr(err);
+	valid = !err;
+	//au_debug_on();
+	if (!valid)
+		LKTRTrace("%.*s invalid\n", DLNPair(dentry));
+	//au_debug_off();
+	return valid;
+}
+
+static void aufs_d_release(struct dentry *dentry)
+{
+	struct aufs_dinfo *dinfo;
+	aufs_bindex_t bend, bindex;
+
+	LKTRTrace("%.*s\n", DLNPair(dentry));
+	DEBUG_ON(!d_unhashed(dentry));
+
+	dinfo = dentry->d_fsdata;
+	if (unlikely(!dinfo))
+		return;
+
+	/* dentry may not be revalidated */
+	bindex = dinfo->di_bstart;
+	if (bindex >= 0) {
+		struct aufs_hdentry *p;
+		bend = dinfo->di_bend;
+		DEBUG_ON(bend < bindex);
+		p = dinfo->di_hdentry + bindex;
+		while (bindex++ <= bend) {
+			if (p->hd_dentry)
+				hdput(p);
+			p++;
+		}
+	}
+	kfree(dinfo->di_hdentry);
+	cache_free_dinfo(dinfo);
+}
+
+#if 0
+/* it may be called at remount time, too */
+static void aufs_d_iput(struct dentry *dentry, struct inode *inode)
+{
+	struct super_block *sb;
+
+	LKTRTrace("%.*s, i%lu\n", DLNPair(dentry), inode->i_ino);
+
+	sb = dentry->d_sb;
+#if 0
+	si_read_lock(sb);
+	if (unlikely(au_flag_test(sb, AuFlag_PLINK)
+		     && au_is_plinked(sb, inode))) {
+		ii_write_lock(inode);
+		au_update_brange(inode, 1);
+		ii_write_unlock(inode);
+	}
+	si_read_unlock(sb);
+#endif
+	iput(inode);
+}
+#endif
+
+struct dentry_operations aufs_dop = {
+	.d_revalidate	= aufs_d_revalidate,
+	.d_release	= aufs_d_release
+	//.d_iput		= aufs_d_iput
+};
diff --git a/fs/aufs/dentry.h b/fs/aufs/dentry.h
new file mode 100755
index 0000000..78049e3
--- /dev/null
+++ b/fs/aufs/dentry.h
@@ -0,0 +1,183 @@
+/*
+ * Copyright (C) 2005, 2006, 2007 Junjiro Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+/* $Id: dentry.h,v 1.25 2007/05/14 03:41:52 sfjro Exp $ */
+
+#ifndef __AUFS_DENTRY_H__
+#define __AUFS_DENTRY_H__
+
+#ifdef __KERNEL__
+
+#include <linux/fs.h>
+#include <linux/aufs_type.h>
+#include "misc.h"
+
+struct aufs_hdentry {
+	struct dentry	*hd_dentry;
+};
+
+struct aufs_dinfo {
+	atomic_t		di_generation;
+
+	struct aufs_rwsem	di_rwsem;
+	aufs_bindex_t		di_bstart, di_bend, di_bwh, di_bdiropq;
+	struct aufs_hdentry	*di_hdentry;
+};
+
+struct lkup_args {
+	struct vfsmount *nfsmnt;
+	int dlgt;
+	//struct super_block *sb;
+};
+
+/* ---------------------------------------------------------------------- */
+
+/* dentry.c */
+#if defined(CONFIG_AUFS_LHASH_PATCH) || defined(CONFIG_AUFS_DLGT)
+struct dentry *lkup_one(const char *name, struct dentry *parent, int len,
+			struct lkup_args *lkup);
+#else
+static inline
+struct dentry *lkup_one(const char *name, struct dentry *parent, int len,
+			struct lkup_args *lkup)
+{
+	return lookup_one_len(name, parent, len);
+}
+#endif
+
+extern struct dentry_operations aufs_dop;
+struct dentry *sio_lkup_one(const char *name, struct dentry *parent, int len,
+			    struct lkup_args *lkup);
+int lkup_dentry(struct dentry *dentry, aufs_bindex_t bstart, mode_t type);
+int lkup_neg(struct dentry *dentry, aufs_bindex_t bindex);
+int au_refresh_hdentry(struct dentry *dentry, mode_t type);
+int au_reval_dpath(struct dentry *dentry, int sgen);
+
+/* dinfo.c */
+int au_alloc_dinfo(struct dentry *dentry);
+struct aufs_dinfo *dtodi(struct dentry *dentry);
+
+void di_read_lock(struct dentry *d, int flags, unsigned int lsc);
+void di_read_unlock(struct dentry *d, int flags);
+void di_downgrade_lock(struct dentry *d, int flags);
+void di_write_lock(struct dentry *d, unsigned int lsc);
+void di_write_unlock(struct dentry *d);
+void di_write_lock2_child(struct dentry *d1, struct dentry *d2, int isdir);
+void di_write_lock2_parent(struct dentry *d1, struct dentry *d2, int isdir);
+void di_write_unlock2(struct dentry *d1, struct dentry *d2);
+
+aufs_bindex_t dbstart(struct dentry *dentry);
+aufs_bindex_t dbend(struct dentry *dentry);
+aufs_bindex_t dbwh(struct dentry *dentry);
+aufs_bindex_t dbdiropq(struct dentry *dentry);
+struct dentry *au_h_dptr_i(struct dentry *dentry, aufs_bindex_t bindex);
+struct dentry *au_h_dptr(struct dentry *dentry);
+
+aufs_bindex_t dbtail(struct dentry *dentry);
+aufs_bindex_t dbtaildir(struct dentry *dentry);
+aufs_bindex_t dbtail_generic(struct dentry *dentry);
+
+void set_dbstart(struct dentry *dentry, aufs_bindex_t bindex);
+void set_dbend(struct dentry *dentry, aufs_bindex_t bindex);
+void set_dbwh(struct dentry *dentry, aufs_bindex_t bindex);
+void set_dbdiropq(struct dentry *dentry, aufs_bindex_t bindex);
+void hdput(struct aufs_hdentry *hdentry);
+void set_h_dptr(struct dentry *dentry, aufs_bindex_t bindex,
+		struct dentry *h_dentry);
+
+void au_update_digen(struct dentry *dentry);
+void au_update_dbstart(struct dentry *dentry);
+int au_find_dbindex(struct dentry *dentry, struct dentry *h_dentry);
+
+/* ---------------------------------------------------------------------- */
+
+static inline int au_digen(struct dentry *d)
+{
+	return atomic_read(&dtodi(d)->di_generation);
+}
+
+#ifdef CONFIG_AUFS_HINOTIFY
+static inline void au_digen_dec(struct dentry *d)
+{
+	atomic_dec(&dtodi(d)->di_generation);
+}
+#endif /* CONFIG_AUFS_HINOTIFY */
+
+/* ---------------------------------------------------------------------- */
+
+/* lock subclass for dinfo */
+enum {
+	AuLsc_DI_CHILD,		/* child first */
+	AuLsc_DI_CHILD2,	/* rename(2), link(2), and cpup at hinotify */
+	AuLsc_DI_CHILD3,	/* copyup dirs */
+	AuLsc_DI_PARENT,
+	AuLsc_DI_PARENT2,
+	AuLsc_DI_PARENT3
+};
+
+/*
+ * di_read_lock_child, di_write_lock_child,
+ * di_read_lock_child2, di_write_lock_child2,
+ * di_read_lock_child3, di_write_lock_child3,
+ * di_read_lock_parent, di_write_lock_parent,
+ * di_read_lock_parent2, di_write_lock_parent2,
+ * di_read_lock_parent3, di_write_lock_parent3,
+ */
+#define ReadLockFunc(name, lsc) \
+static inline void di_read_lock_##name(struct dentry *d, int flags) \
+{di_read_lock(d, flags, AuLsc_DI_##lsc);}
+
+#define WriteLockFunc(name, lsc) \
+static inline void di_write_lock_##name(struct dentry *d) \
+{di_write_lock(d, AuLsc_DI_##lsc);}
+
+#define RWLockFuncs(name, lsc) \
+	ReadLockFunc(name, lsc); \
+	WriteLockFunc(name, lsc)
+
+RWLockFuncs(child, CHILD);
+RWLockFuncs(child2, CHILD2);
+RWLockFuncs(child3, CHILD3);
+RWLockFuncs(parent, PARENT);
+RWLockFuncs(parent2, PARENT2);
+RWLockFuncs(parent3, PARENT3);
+
+#undef ReadLockFunc
+#undef WriteLockFunc
+#undef RWLockFunc
+
+/* to debug easier, do not make them inlined functions */
+#define DiMustReadLock(d) do { \
+	SiMustAnyLock((d)->d_sb); \
+	RwMustReadLock(&dtodi(d)->di_rwsem); \
+} while (0)
+
+#define DiMustWriteLock(d) do { \
+	SiMustAnyLock((d)->d_sb); \
+	RwMustWriteLock(&dtodi(d)->di_rwsem); \
+} while (0)
+
+#define DiMustAnyLock(d) do { \
+	SiMustAnyLock((d)->d_sb); \
+	RwMustAnyLock(&dtodi(d)->di_rwsem); \
+} while (0)
+
+#define DiMustNoWaiters(d)	RwMustNoWaiters(&dtodi(d)->di_rwsem)
+
+#endif /* __KERNEL__ */
+#endif /* __AUFS_DENTRY_H__ */
diff --git a/fs/aufs/dinfo.c b/fs/aufs/dinfo.c
new file mode 100755
index 0000000..6082149
--- /dev/null
+++ b/fs/aufs/dinfo.c
@@ -0,0 +1,419 @@
+/*
+ * Copyright (C) 2005, 2006, 2007 Junjiro Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+/* $Id: dinfo.c,v 1.23 2007/05/07 03:43:36 sfjro Exp $ */
+
+#include "aufs.h"
+
+int au_alloc_dinfo(struct dentry *dentry)
+{
+	struct aufs_dinfo *dinfo;
+	struct super_block *sb;
+	int nbr;
+
+	LKTRTrace("%.*s\n", DLNPair(dentry));
+	DEBUG_ON(dentry->d_fsdata);
+
+	dinfo = cache_alloc_dinfo();
+	//if (LktrCond) {cache_free_dinfo(dinfo); dinfo = NULL;}
+	if (dinfo) {
+		sb = dentry->d_sb;
+		nbr = sbend(sb) + 1;
+		if (unlikely(!nbr))
+			nbr++;
+		dinfo->di_hdentry = kcalloc(nbr, sizeof(*dinfo->di_hdentry),
+					    GFP_KERNEL);
+		//if (LktrCond)
+		//{kfree(dinfo->di_hdentry); dinfo->di_hdentry = NULL;}
+		if (dinfo->di_hdentry) {
+			rw_init_wlock_nested(&dinfo->di_rwsem, AuLsc_DI_PARENT);
+			dinfo->di_bstart = dinfo->di_bend = -1;
+			dinfo->di_bwh = dinfo->di_bdiropq = -1;
+			atomic_set(&dinfo->di_generation, au_sigen(sb));
+
+			dentry->d_fsdata = dinfo;
+			dentry->d_op = &aufs_dop;
+			return 0; /* success */
+		}
+		cache_free_dinfo(dinfo);
+	}
+	TraceErr(-ENOMEM);
+	return -ENOMEM;
+}
+
+struct aufs_dinfo *dtodi(struct dentry *dentry)
+{
+	struct aufs_dinfo *dinfo = dentry->d_fsdata;
+	DEBUG_ON(!dinfo
+		 || !dinfo->di_hdentry
+		 /* || stosi(dentry->d_sb)->si_bend < dinfo->di_bend */
+		 || dinfo->di_bend < dinfo->di_bstart
+		 /* dbwh can be outside of this range */
+		 || (0 <= dinfo->di_bdiropq
+		     && (dinfo->di_bdiropq < dinfo->di_bstart
+			 /* || dinfo->di_bend < dinfo->di_bdiropq */))
+		);
+	return dinfo;
+}
+
+/* ---------------------------------------------------------------------- */
+
+static void do_ii_write_lock(struct inode *inode, unsigned int lsc)
+{
+	switch (lsc) {
+	case AuLsc_DI_CHILD:
+		ii_write_lock_child(inode);
+		break;
+	case AuLsc_DI_CHILD2:
+		ii_write_lock_child2(inode);
+		break;
+	case AuLsc_DI_CHILD3:
+		ii_write_lock_child3(inode);
+		break;
+	case AuLsc_DI_PARENT:
+		ii_write_lock_parent(inode);
+		break;
+	case AuLsc_DI_PARENT2:
+		ii_write_lock_parent2(inode);
+		break;
+	case AuLsc_DI_PARENT3:
+		ii_write_lock_parent3(inode);
+		break;
+	default:
+		BUG();
+	}
+}
+
+static void do_ii_read_lock(struct inode *inode, unsigned int lsc)
+{
+	switch (lsc) {
+	case AuLsc_DI_CHILD:
+		ii_read_lock_child(inode);
+		break;
+	case AuLsc_DI_CHILD2:
+		ii_read_lock_child2(inode);
+		break;
+	case AuLsc_DI_CHILD3:
+		ii_read_lock_child3(inode);
+		break;
+	case AuLsc_DI_PARENT:
+		ii_read_lock_parent(inode);
+		break;
+	case AuLsc_DI_PARENT2:
+		ii_read_lock_parent2(inode);
+		break;
+	case AuLsc_DI_PARENT3:
+		ii_read_lock_parent3(inode);
+		break;
+	default:
+		BUG();
+	}
+}
+
+void di_read_lock(struct dentry *d, int flags, unsigned int lsc)
+{
+	SiMustAnyLock(d->d_sb);
+	// todo: always nested?
+	rw_read_lock_nested(&dtodi(d)->di_rwsem, lsc);
+	if (d->d_inode) {
+		if (flags & AUFS_I_WLOCK)
+			do_ii_write_lock(d->d_inode, lsc);
+		else if (flags & AUFS_I_RLOCK)
+			do_ii_read_lock(d->d_inode, lsc);
+	}
+}
+
+void di_read_unlock(struct dentry *d, int flags)
+{
+	SiMustAnyLock(d->d_sb);
+	if (d->d_inode) {
+		if (flags & AUFS_I_WLOCK)
+			ii_write_unlock(d->d_inode);
+		else if (flags & AUFS_I_RLOCK)
+			ii_read_unlock(d->d_inode);
+	}
+	rw_read_unlock(&dtodi(d)->di_rwsem);
+}
+
+void di_downgrade_lock(struct dentry *d, int flags)
+{
+	SiMustAnyLock(d->d_sb);
+	rw_dgrade_lock(&dtodi(d)->di_rwsem);
+	if (d->d_inode && (flags & AUFS_I_RLOCK))
+		ii_downgrade_lock(d->d_inode);
+}
+
+void di_write_lock(struct dentry *d, unsigned int lsc)
+{
+	SiMustAnyLock(d->d_sb);
+	// todo: always nested?
+	rw_write_lock_nested(&dtodi(d)->di_rwsem, lsc);
+	if (d->d_inode)
+		do_ii_write_lock(d->d_inode, lsc);
+}
+
+void di_write_unlock(struct dentry *d)
+{
+	SiMustAnyLock(d->d_sb);
+	if (d->d_inode)
+		ii_write_unlock(d->d_inode);
+	rw_write_unlock(&dtodi(d)->di_rwsem);
+}
+
+void di_write_lock2_child(struct dentry *d1, struct dentry *d2, int isdir)
+{
+	struct dentry *d;
+
+	TraceEnter();
+	DEBUG_ON(d1 == d2
+		 || d1->d_inode == d2->d_inode
+		 || d1->d_sb != d2->d_sb);
+
+	if (isdir)
+		for (d = d1; d->d_parent != d; d = d->d_parent) // dget_parent()
+			if (d->d_parent == d2) {
+				di_write_lock_child(d1);
+				di_write_lock_child2(d2);
+				return;
+			}
+
+	di_write_lock_child(d2);
+	di_write_lock_child2(d1);
+}
+
+void di_write_lock2_parent(struct dentry *d1, struct dentry *d2, int isdir)
+{
+	struct dentry *d;
+
+	TraceEnter();
+	DEBUG_ON(d1 == d2
+		 || d1->d_inode == d2->d_inode
+		 || d1->d_sb != d2->d_sb);
+
+	if (isdir)
+		for (d = d1; d->d_parent != d; d = d->d_parent) // dget_parent()
+			if (d->d_parent == d2) {
+				di_write_lock_parent(d1);
+				di_write_lock_parent2(d2);
+				return;
+			}
+
+	di_write_lock_parent(d2);
+	di_write_lock_parent2(d1);
+}
+
+void di_write_unlock2(struct dentry *d1, struct dentry *d2)
+{
+	di_write_unlock(d1);
+	if (d1->d_inode == d2->d_inode)
+		rw_write_unlock(&dtodi(d2)->di_rwsem);
+	else
+		di_write_unlock(d2);
+}
+
+/* ---------------------------------------------------------------------- */
+
+aufs_bindex_t dbstart(struct dentry *dentry)
+{
+	DiMustAnyLock(dentry);
+	return dtodi(dentry)->di_bstart;
+}
+
+aufs_bindex_t dbend(struct dentry *dentry)
+{
+	DiMustAnyLock(dentry);
+	return dtodi(dentry)->di_bend;
+}
+
+aufs_bindex_t dbwh(struct dentry *dentry)
+{
+	DiMustAnyLock(dentry);
+	return dtodi(dentry)->di_bwh;
+}
+
+aufs_bindex_t dbdiropq(struct dentry *dentry)
+{
+	DiMustAnyLock(dentry);
+	DEBUG_ON(dentry->d_inode
+		 && dentry->d_inode->i_mode
+		 && !S_ISDIR(dentry->d_inode->i_mode));
+	return dtodi(dentry)->di_bdiropq;
+}
+
+struct dentry *au_h_dptr_i(struct dentry *dentry, aufs_bindex_t bindex)
+{
+	struct dentry *d;
+
+	DiMustAnyLock(dentry);
+	if (dbstart(dentry) < 0 || bindex < dbstart(dentry))
+		return NULL;
+	DEBUG_ON(bindex < 0
+		 /* || bindex > sbend(dentry->d_sb) */);
+	d = dtodi(dentry)->di_hdentry[0 + bindex].hd_dentry;
+	DEBUG_ON(d && (atomic_read(&d->d_count) <= 0));
+	return d;
+}
+
+struct dentry *au_h_dptr(struct dentry *dentry)
+{
+	return au_h_dptr_i(dentry, dbstart(dentry));
+}
+
+aufs_bindex_t dbtail(struct dentry *dentry)
+{
+	aufs_bindex_t bend, bwh;
+
+	bend = dbend(dentry);
+	if (0 <= bend) {
+		bwh = dbwh(dentry);
+		//DEBUG_ON(bend < bwh);
+		if (!bwh)
+			return bwh;
+		if (0 < bwh && bwh < bend)
+			return bwh - 1;
+	}
+	return bend;
+}
+
+aufs_bindex_t dbtaildir(struct dentry *dentry)
+{
+	aufs_bindex_t bend, bopq;
+
+	DEBUG_ON(dentry->d_inode
+		 && dentry->d_inode->i_mode
+		 && !S_ISDIR(dentry->d_inode->i_mode));
+
+	bend = dbtail(dentry);
+	if (0 <= bend) {
+		bopq = dbdiropq(dentry);
+		DEBUG_ON(bend < bopq);
+		if (0 <= bopq && bopq < bend)
+			bend = bopq;
+	}
+	return bend;
+}
+
+aufs_bindex_t dbtail_generic(struct dentry *dentry)
+{
+	struct inode *inode;
+
+	inode = dentry->d_inode;
+	if (inode && S_ISDIR(inode->i_mode))
+		return dbtaildir(dentry);
+	else
+		return dbtail(dentry);
+}
+
+/* ---------------------------------------------------------------------- */
+
+// hard/soft set
+void set_dbstart(struct dentry *dentry, aufs_bindex_t bindex)
+{
+	DiMustWriteLock(dentry);
+	DEBUG_ON(sbend(dentry->d_sb) < bindex);
+	/* */
+	dtodi(dentry)->di_bstart = bindex;
+}
+
+void set_dbend(struct dentry *dentry, aufs_bindex_t bindex)
+{
+	DiMustWriteLock(dentry);
+	DEBUG_ON(sbend(dentry->d_sb) < bindex
+		 || bindex < dbstart(dentry));
+	dtodi(dentry)->di_bend = bindex;
+}
+
+void set_dbwh(struct dentry *dentry, aufs_bindex_t bindex)
+{
+	DiMustWriteLock(dentry);
+	DEBUG_ON(sbend(dentry->d_sb) < bindex);
+	/* dbwh can be outside of bstart - bend range */
+	dtodi(dentry)->di_bwh = bindex;
+}
+
+void set_dbdiropq(struct dentry *dentry, aufs_bindex_t bindex)
+{
+	DiMustWriteLock(dentry);
+	DEBUG_ON(sbend(dentry->d_sb) < bindex);
+	DEBUG_ON((bindex != -1
+		  && (bindex < dbstart(dentry) || dbend(dentry) < bindex))
+		 || (dentry->d_inode
+		     && dentry->d_inode->i_mode
+		     && !S_ISDIR(dentry->d_inode->i_mode)));
+	dtodi(dentry)->di_bdiropq = bindex;
+}
+
+void hdput(struct aufs_hdentry *hd)
+{
+	dput(hd->hd_dentry);
+}
+
+void set_h_dptr(struct dentry *dentry, aufs_bindex_t bindex,
+		struct dentry *h_dentry)
+{
+	struct aufs_hdentry *hd = dtodi(dentry)->di_hdentry + bindex;
+	DiMustWriteLock(dentry);
+	DEBUG_ON(bindex < dtodi(dentry)->di_bstart
+		 || bindex > dtodi(dentry)->di_bend
+		 || (h_dentry && atomic_read(&h_dentry->d_count) <= 0)
+		 || (h_dentry && hd->hd_dentry)
+		);
+	if (hd->hd_dentry)
+		hdput(hd);
+	hd->hd_dentry = h_dentry;
+}
+
+/* ---------------------------------------------------------------------- */
+
+void au_update_digen(struct dentry *dentry)
+{
+	//DiMustWriteLock(dentry);
+	DEBUG_ON(!dentry->d_sb);
+	atomic_set(&dtodi(dentry)->di_generation, au_sigen(dentry->d_sb));
+}
+
+void au_update_dbstart(struct dentry *dentry)
+{
+	aufs_bindex_t bindex, bstart = dbstart(dentry), bend = dbend(dentry);
+	struct dentry *hidden_dentry;
+
+	DiMustWriteLock(dentry);
+	for (bindex = bstart; bindex <= bend; bindex++) {
+		hidden_dentry = au_h_dptr_i(dentry, bindex);
+		if (!hidden_dentry)
+			continue;
+		if (hidden_dentry->d_inode) {
+			set_dbstart(dentry, bindex);
+			return;
+		}
+		set_h_dptr(dentry, bindex, NULL);
+	}
+	//set_dbstart(dentry, -1);
+	//set_dbend(dentry, -1);
+}
+
+int au_find_dbindex(struct dentry *dentry, struct dentry *hidden_dentry)
+{
+	aufs_bindex_t bindex, bend;
+
+	bend = dbend(dentry);
+	for (bindex = dbstart(dentry); bindex <= bend; bindex++)
+		if (au_h_dptr_i(dentry, bindex) == hidden_dentry)
+			return bindex;
+	return -1;
+}
diff --git a/fs/aufs/dir.c b/fs/aufs/dir.c
new file mode 100755
index 0000000..9afb1a9
--- /dev/null
+++ b/fs/aufs/dir.c
@@ -0,0 +1,564 @@
+/*
+ * Copyright (C) 2005, 2006, 2007 Junjiro Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+/* $Id: dir.c,v 1.36 2007/05/14 03:38:52 sfjro Exp $ */
+
+#include "aufs.h"
+
+static int reopen_dir(struct file *file)
+{
+	int err;
+	struct dentry *dentry, *hidden_dentry;
+	aufs_bindex_t bindex, btail, bstart;
+	struct file *hidden_file;
+
+	dentry = file->f_dentry;
+	LKTRTrace("%.*s\n", DLNPair(dentry));
+	DEBUG_ON(!S_ISDIR(dentry->d_inode->i_mode));
+
+	/* open all hidden dirs */
+	bstart = dbstart(dentry);
+#if 1
+	for (bindex = fbstart(file); bindex < bstart; bindex++)
+		set_h_fptr(file, bindex, NULL);
+#endif
+	set_fbstart(file, bstart);
+	btail = dbtaildir(dentry);
+#if 1
+	for (bindex = fbend(file); btail < bindex; bindex--)
+		set_h_fptr(file, bindex, NULL);
+#endif
+	set_fbend(file, btail);
+	for (bindex = bstart; bindex <= btail; bindex++) {
+		hidden_dentry = au_h_dptr_i(dentry, bindex);
+		if (!hidden_dentry)
+			continue;
+		hidden_file = au_h_fptr_i(file, bindex);
+		if (hidden_file) {
+			DEBUG_ON(hidden_file->f_dentry != hidden_dentry);
+			continue;
+		}
+
+		hidden_file = hidden_open(dentry, bindex, file->f_flags);
+		// unavailable
+		//if (LktrCond) {fput(hidden_file);
+		//br_put(stobr(dentry->d_sb, bindex));hidden_file=ERR_PTR(-1);}
+		err = PTR_ERR(hidden_file);
+		if (IS_ERR(hidden_file))
+			goto out; // close all?
+		//cpup_file_flags(hidden_file, file);
+		set_h_fptr(file, bindex, hidden_file);
+	}
+	err = 0;
+
+ out:
+	TraceErr(err);
+	return err;
+}
+
+static int do_open_dir(struct file *file, int flags)
+{
+	int err;
+	aufs_bindex_t bindex, btail;
+	struct dentry *dentry, *hidden_dentry;
+	struct file *hidden_file;
+
+	dentry = file->f_dentry;
+	LKTRTrace("%.*s, 0x%x\n", DLNPair(dentry), flags);
+	DEBUG_ON(!dentry->d_inode || !S_ISDIR(dentry->d_inode->i_mode));
+
+	err = 0;
+	set_fvdir_cache(file, NULL);
+	file->f_version = dentry->d_inode->i_version;
+	bindex = dbstart(dentry);
+	set_fbstart(file, bindex);
+	btail = dbtaildir(dentry);
+	set_fbend(file, btail);
+	for (; !err && bindex <= btail; bindex++) {
+		hidden_dentry = au_h_dptr_i(dentry, bindex);
+		if (!hidden_dentry)
+			continue;
+
+		hidden_file = hidden_open(dentry, bindex, flags);
+		//if (LktrCond) {fput(hidden_file);
+		//br_put(stobr(dentry->d_sb, bindex));hidden_file=ERR_PTR(-1);}
+		if (!IS_ERR(hidden_file)) {
+			set_h_fptr(file, bindex, hidden_file);
+			continue;
+		}
+		err = PTR_ERR(hidden_file);
+	}
+	if (!err)
+		return 0; /* success */
+
+	/* close all */
+	for (bindex = fbstart(file); !err && bindex <= btail; bindex++)
+		set_h_fptr(file, bindex, NULL);
+	set_fbstart(file, -1);
+	set_fbend(file, -1);
+	return err;
+}
+
+static int aufs_open_dir(struct inode *inode, struct file *file)
+{
+	return au_do_open(inode, file, do_open_dir);
+}
+
+static int aufs_release_dir(struct inode *inode, struct file *file)
+{
+	struct aufs_vdir *vdir_cache;
+	struct super_block *sb;
+
+	LKTRTrace("i%lu, %.*s\n", inode->i_ino, DLNPair(file->f_dentry));
+
+	sb = file->f_dentry->d_sb;
+	si_read_lock(sb);
+	fi_write_lock(file);
+	vdir_cache = fvdir_cache(file);
+	if (vdir_cache)
+		free_vdir(vdir_cache);
+	fi_write_unlock(file);
+	au_fin_finfo(file);
+	si_read_unlock(sb);
+	return 0;
+}
+
+static int fsync_dir(struct dentry *dentry, int datasync)
+{
+	int err;
+	struct inode *inode;
+	struct super_block *sb;
+	aufs_bindex_t bend, bindex;
+
+	LKTRTrace("%.*s, %d\n", DLNPair(dentry), datasync);
+	DiMustAnyLock(dentry);
+	sb = dentry->d_sb;
+	SiMustAnyLock(sb);
+	inode = dentry->d_inode;
+	IMustLock(inode);
+	IiMustAnyLock(inode);
+
+	err = 0;
+	bend = dbend(dentry);
+	for (bindex = dbstart(dentry); !err && bindex <= bend; bindex++) {
+		struct dentry *h_dentry;
+		struct inode *h_inode;
+		struct file_operations *fop;
+
+		if (test_ro(sb, bindex, inode))
+			continue;
+		h_dentry = au_h_dptr_i(dentry, bindex);
+		if (!h_dentry)
+			continue;
+		h_inode = h_dentry->d_inode;
+		if (!h_inode)
+			continue;
+
+		/* cf. fs/nsfd/vfs.c and fs/nfsd/nfs4recover.c */
+		//hdir_lock(h_inode, inode, bindex);
+		i_lock(h_inode);
+		fop = (void*)h_inode->i_fop;
+		err = filemap_fdatawrite(h_inode->i_mapping);
+		if (!err && fop && fop->fsync)
+			err = fop->fsync(NULL, h_dentry, datasync);
+		if (!err)
+			err = filemap_fdatawrite(h_inode->i_mapping);
+		//hdir_unlock(h_inode, inode, bindex);
+		i_unlock(h_inode);
+	}
+
+	TraceErr(err);
+	return err;
+}
+
+/*
+ * @file may be NULL
+ */
+static int aufs_fsync_dir(struct file *file, struct dentry *dentry,
+			  int datasync)
+{
+	int err;
+	struct inode *inode;
+	struct file *hidden_file;
+	struct super_block *sb;
+	aufs_bindex_t bend, bindex;
+
+	LKTRTrace("%.*s, %d\n", DLNPair(dentry), datasync);
+	inode = dentry->d_inode;
+	IMustLock(inode);
+
+	err = 0;
+	sb = dentry->d_sb;
+	si_read_lock(sb);
+	if (file) {
+		err = au_reval_and_lock_finfo(file, reopen_dir, /*wlock*/1,
+					      /*locked*/1);
+		//err = -1;
+		if (unlikely(err))
+			goto out;
+	} else
+		di_read_lock_child(dentry, !AUFS_I_WLOCK);
+
+	ii_write_lock_child(inode);
+	if (file) {
+		bend = fbend(file);
+		for (bindex = fbstart(file); !err && bindex <= bend; bindex++) {
+			hidden_file = au_h_fptr_i(file, bindex);
+			if (!hidden_file || test_ro(sb, bindex, inode))
+				continue;
+
+			err = -EINVAL;
+			if (hidden_file->f_op && hidden_file->f_op->fsync) {
+				// todo: try do_fsync() in fs/sync.c
+#if 0
+				DEBUG_ON(hidden_file->f_dentry->d_inode
+					 != au_h_iptr_i(inode, bindex));
+				hdir_lock(hidden_file->f_dentry->d_inode, inode,
+					  bindex);
+#else
+				i_lock(hidden_file->f_dentry->d_inode);
+#endif
+				err = hidden_file->f_op->fsync
+					(hidden_file, hidden_file->f_dentry,
+					 datasync);
+				//err = -1;
+#if 0
+				hdir_unlock(hidden_file->f_dentry->d_inode,
+					    inode, bindex);
+#else
+				i_unlock(hidden_file->f_dentry->d_inode);
+#endif
+			}
+		}
+	} else
+		err = fsync_dir(dentry, datasync);
+	au_cpup_attr_timesizes(inode);
+	ii_write_unlock(inode);
+	if (file)
+		fi_write_unlock(file);
+	else
+		di_read_unlock(dentry, !AUFS_I_WLOCK);
+
+ out:
+	si_read_unlock(sb);
+	TraceErr(err);
+	return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+static int aufs_readdir(struct file *file, void *dirent, filldir_t filldir)
+{
+	int err;
+	struct dentry *dentry;
+	struct inode *inode;
+	struct super_block *sb;
+
+	dentry = file->f_dentry;
+	LKTRTrace("%.*s, pos %Ld\n", DLNPair(dentry), file->f_pos);
+	inode = dentry->d_inode;
+	IMustLock(inode);
+
+	au_nfsd_lockdep_off();
+	sb = dentry->d_sb;
+	si_read_lock(sb);
+	err = au_reval_and_lock_finfo(file, reopen_dir, /*wlock*/1,
+				      /*locked*/1);
+	if (unlikely(err))
+		goto out;
+
+	ii_write_lock_child(inode);
+	err = au_init_vdir(file);
+	if (unlikely(err)) {
+		ii_write_unlock(inode);
+		goto out_unlock;
+	}
+	//DbgVdir(fvdir_cache(file));// goto out_unlock;
+
+	/* nfsd filldir calls lookup_one_len(). */
+	ii_downgrade_lock(inode);
+	err = au_fill_de(file, dirent, filldir);
+	//DbgVdir(fvdir_cache(file));// goto out_unlock;
+
+	inode->i_atime = au_h_iptr(inode)->i_atime;
+	ii_read_unlock(inode);
+
+ out_unlock:
+	fi_write_unlock(file);
+ out:
+	si_read_unlock(sb);
+	au_nfsd_lockdep_on();
+#if 0 // debug
+	if (LktrCond)
+		igrab(inode);
+#endif
+	TraceErr(err);
+	return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+struct test_empty_arg {
+	struct aufs_nhash *whlist;
+	int whonly;
+	aufs_bindex_t bindex;
+	int err, called;
+};
+
+static int test_empty_cb(void *__arg, const char *__name, int namelen,
+			 loff_t offset, filldir_ino_t ino, unsigned int d_type)
+{
+	struct test_empty_arg *arg = __arg;
+	char *name = (void*)__name;
+
+	LKTRTrace("%.*s\n", namelen, name);
+
+	arg->err = 0;
+	arg->called++;
+	//smp_mb();
+	if (name[0] == '.'
+	    && (namelen == 1 || (name[1] == '.' && namelen == 2)))
+		return 0; /* success */
+
+	if (namelen <= AUFS_WH_PFX_LEN
+	    || memcmp(name, AUFS_WH_PFX, AUFS_WH_PFX_LEN)) {
+		if (arg->whonly && !test_known_wh(arg->whlist, name, namelen))
+			arg->err = -ENOTEMPTY;
+		goto out;
+	}
+
+	name += AUFS_WH_PFX_LEN;
+	namelen -= AUFS_WH_PFX_LEN;
+	if (!test_known_wh(arg->whlist, name, namelen))
+		arg->err = append_wh(arg->whlist, name, namelen, arg->bindex);
+
+ out:
+	//smp_mb();
+	TraceErr(arg->err);
+	return arg->err;
+}
+
+static int do_test_empty(struct dentry *dentry, struct test_empty_arg *arg)
+{
+	int err, dlgt;
+	struct file *hidden_file;
+
+	LKTRTrace("%.*s, {%p, %d, %d}\n",
+		  DLNPair(dentry), arg->whlist, arg->whonly, arg->bindex);
+
+	hidden_file = hidden_open(dentry, arg->bindex,
+				  O_RDONLY | O_NONBLOCK | O_DIRECTORY
+				  | O_LARGEFILE);
+	err = PTR_ERR(hidden_file);
+	if (IS_ERR(hidden_file))
+		goto out;
+
+	dlgt = need_dlgt(dentry->d_sb);
+	//hidden_file->f_pos = 0;
+	do {
+		arg->err = 0;
+		arg->called = 0;
+		//smp_mb();
+		err = vfsub_readdir(hidden_file, test_empty_cb, arg, dlgt);
+		if (err >= 0)
+			err = arg->err;
+	} while (!err && arg->called);
+	fput(hidden_file);
+	sbr_put(dentry->d_sb, arg->bindex);
+
+ out:
+	TraceErr(err);
+	return err;
+}
+
+struct do_test_empty_args {
+	int *errp;
+	struct dentry *dentry;
+	struct test_empty_arg *arg;
+};
+
+static void call_do_test_empty(void *args)
+{
+	struct do_test_empty_args *a = args;
+	*a->errp = do_test_empty(a->dentry, a->arg);
+}
+
+static int sio_test_empty(struct dentry *dentry, struct test_empty_arg *arg)
+{
+	int err;
+	struct dentry *hidden_dentry;
+	struct inode *hidden_inode;
+
+	LKTRTrace("%.*s\n", DLNPair(dentry));
+	hidden_dentry = au_h_dptr_i(dentry, arg->bindex);
+	DEBUG_ON(!hidden_dentry);
+	hidden_inode = hidden_dentry->d_inode;
+	DEBUG_ON(!hidden_inode || !S_ISDIR(hidden_inode->i_mode));
+
+	hi_lock_child(hidden_inode);
+	err = au_test_perm(hidden_inode, MAY_EXEC | MAY_READ,
+			   need_dlgt(dentry->d_sb));
+	i_unlock(hidden_inode);
+	if (!err)
+		err = do_test_empty(dentry, arg);
+	else {
+		struct do_test_empty_args args = {
+			.errp	= &err,
+			.dentry	= dentry,
+			.arg	= arg
+		};
+		au_wkq_wait(call_do_test_empty, &args, /*dlgt*/0);
+	}
+
+	TraceErr(err);
+	return err;
+}
+
+int au_test_empty_lower(struct dentry *dentry)
+{
+	int err;
+	struct inode *inode;
+	struct test_empty_arg arg;
+	struct aufs_nhash *whlist;
+	aufs_bindex_t bindex, bstart, btail;
+
+	LKTRTrace("%.*s\n", DLNPair(dentry));
+	inode = dentry->d_inode;
+	DEBUG_ON(!inode || !S_ISDIR(inode->i_mode));
+
+	whlist = nhash_new(GFP_KERNEL);
+	err = PTR_ERR(whlist);
+	if (IS_ERR(whlist))
+		goto out;
+
+	bstart = dbstart(dentry);
+	arg.whlist = whlist;
+	arg.whonly = 0;
+	arg.bindex = bstart;
+	err = do_test_empty(dentry, &arg);
+	if (unlikely(err))
+		goto out_whlist;
+
+	arg.whonly = 1;
+	btail = dbtaildir(dentry);
+	for (bindex = bstart + 1; !err && bindex <= btail; bindex++) {
+		struct dentry *hidden_dentry;
+		hidden_dentry = au_h_dptr_i(dentry, bindex);
+		if (hidden_dentry && hidden_dentry->d_inode) {
+			DEBUG_ON(!S_ISDIR(hidden_dentry->d_inode->i_mode));
+			arg.bindex = bindex;
+			err = do_test_empty(dentry, &arg);
+		}
+	}
+
+ out_whlist:
+	nhash_del(whlist);
+ out:
+	TraceErr(err);
+	return err;
+}
+
+int test_empty(struct dentry *dentry, struct aufs_nhash *whlist)
+{
+	int err;
+	struct inode *inode;
+	struct test_empty_arg arg;
+	aufs_bindex_t bindex, btail;
+
+	LKTRTrace("%.*s\n", DLNPair(dentry));
+	inode = dentry->d_inode;
+	DEBUG_ON(!inode || !S_ISDIR(inode->i_mode));
+
+	err = 0;
+	arg.whlist = whlist;
+	arg.whonly = 1;
+	btail = dbtaildir(dentry);
+	for (bindex = dbstart(dentry); !err && bindex <= btail; bindex++) {
+		struct dentry *hidden_dentry;
+		hidden_dentry = au_h_dptr_i(dentry, bindex);
+		if (hidden_dentry && hidden_dentry->d_inode) {
+			DEBUG_ON(!S_ISDIR(hidden_dentry->d_inode->i_mode));
+			arg.bindex = bindex;
+			err = sio_test_empty(dentry, &arg);
+		}
+	}
+
+	TraceErr(err);
+	return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+void au_add_nlink(struct inode *dir, struct inode *h_dir)
+{
+	DEBUG_ON(!S_ISDIR(dir->i_mode) || !S_ISDIR(h_dir->i_mode));
+	dir->i_nlink += h_dir->i_nlink - 2;
+	if (unlikely(h_dir->i_nlink < 2))
+		dir->i_nlink += 2;
+}
+
+void au_sub_nlink(struct inode *dir, struct inode *h_dir)
+{
+	DEBUG_ON(!S_ISDIR(dir->i_mode) || !S_ISDIR(h_dir->i_mode));
+	dir->i_nlink -= h_dir->i_nlink - 2;
+	if (unlikely(h_dir->i_nlink < 2))
+		dir->i_nlink -= 2;
+}
+
+/* ---------------------------------------------------------------------- */
+
+#if 0 // comment
+struct file_operations {
+	struct module *owner;
+	loff_t (*llseek) (struct file *, loff_t, int);
+	ssize_t (*read) (struct file *, char __user *, size_t, loff_t *);
+	ssize_t (*aio_read) (struct kiocb *, char __user *, size_t, loff_t);
+	ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *);
+	ssize_t (*aio_write) (struct kiocb *, const char __user *, size_t, loff_t);
+	int (*readdir) (struct file *, void *, filldir_t);
+	unsigned int (*poll) (struct file *, struct poll_table_struct *);
+	int (*ioctl) (struct inode *, struct file *, unsigned int, unsigned long);
+	long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long);
+	long (*compat_ioctl) (struct file *, unsigned int, unsigned long);
+	int (*mmap) (struct file *, struct vm_area_struct *);
+	int (*open) (struct inode *, struct file *);
+	int (*flush) (struct file *);
+	int (*release) (struct inode *, struct file *);
+	int (*fsync) (struct file *, struct dentry *, int datasync);
+	int (*aio_fsync) (struct kiocb *, int datasync);
+	int (*fasync) (int, struct file *, int);
+	int (*lock) (struct file *, int, struct file_lock *);
+	ssize_t (*readv) (struct file *, const struct iovec *, unsigned long, loff_t *);
+	ssize_t (*writev) (struct file *, const struct iovec *, unsigned long, loff_t *);
+	ssize_t (*sendfile) (struct file *, loff_t *, size_t, read_actor_t, void *);
+	ssize_t (*sendpage) (struct file *, struct page *, int, size_t, loff_t *, int);
+	unsigned long (*get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long);
+	int (*check_flags)(int);
+	int (*dir_notify)(struct file *file, unsigned long arg);
+	int (*flock) (struct file *, int, struct file_lock *);
+};
+#endif
+
+struct file_operations aufs_dir_fop = {
+	.read		= generic_read_dir,
+	.readdir	= aufs_readdir,
+	.open		= aufs_open_dir,
+	.release	= aufs_release_dir,
+	.flush		= aufs_flush,
+	.fsync		= aufs_fsync_dir,
+};
diff --git a/fs/aufs/dir.h b/fs/aufs/dir.h
new file mode 100755
index 0000000..3ddf309
--- /dev/null
+++ b/fs/aufs/dir.h
@@ -0,0 +1,125 @@
+/*
+ * Copyright (C) 2005, 2006, 2007 Junjiro Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+/* $Id: dir.h,v 1.18 2007/05/14 03:41:52 sfjro Exp $ */
+
+#ifndef __AUFS_DIR_H__
+#define __AUFS_DIR_H__
+
+#ifdef __KERNEL__
+
+#include <linux/fs.h>
+#include <linux/version.h>
+#include <linux/aufs_type.h>
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,19)
+#define filldir_ino_t	u64
+#else
+#define filldir_ino_t	ino_t
+#endif
+
+/* ---------------------------------------------------------------------- */
+
+/* need to be faster and smaller */
+
+#define AUFS_DEBLK_SIZE 512 // todo: changable
+#define AUFS_NHASH_SIZE	32 // todo: changable
+#if AUFS_DEBLK_SIZE < NAME_MAX || PAGE_SIZE < AUFS_DEBLK_SIZE
+#error invalid size AUFS_DEBLK_SIZE
+#endif
+
+typedef char aufs_deblk_t[AUFS_DEBLK_SIZE];
+
+struct aufs_nhash {
+	struct hlist_head heads[AUFS_NHASH_SIZE];
+};
+
+struct aufs_destr {
+	unsigned char	len;
+	char		name[0];
+} __attribute__ ((packed));
+
+struct aufs_dehstr {
+	struct hlist_node hash;
+	struct aufs_destr *str;
+};
+
+struct aufs_de {
+	ino_t			de_ino;
+	unsigned char		de_type;
+	//caution: packed
+	struct aufs_destr	de_str;
+} __attribute__ ((packed));
+
+struct aufs_wh {
+	struct hlist_node	wh_hash;
+	aufs_bindex_t		wh_bindex;
+	struct aufs_destr	wh_str;
+} __attribute__ ((packed));
+
+union aufs_deblk_p {
+	unsigned char	*p;
+	aufs_deblk_t	*deblk;
+	struct aufs_de	*de;
+};
+
+struct aufs_vdir {
+	aufs_deblk_t	**vd_deblk;
+	int		vd_nblk;
+	struct {
+		int			i;
+		union aufs_deblk_p	p;
+	} vd_last;
+
+	unsigned long	vd_version;
+	unsigned long	vd_jiffy;
+};
+
+/* ---------------------------------------------------------------------- */
+
+/* dir.c */
+extern struct file_operations aufs_dir_fop;
+int au_test_empty_lower(struct dentry *dentry);
+int test_empty(struct dentry *dentry, struct aufs_nhash *whlist);
+void au_add_nlink(struct inode *dir, struct inode *h_dir);
+void au_sub_nlink(struct inode *dir, struct inode *h_dir);
+
+/* vdir.c */
+struct aufs_nhash *nhash_new(gfp_t gfp);
+void nhash_del(struct aufs_nhash *nhash);
+void nhash_init(struct aufs_nhash *nhash);
+void nhash_move(struct aufs_nhash *dst, struct aufs_nhash *src);
+void nhash_fin(struct aufs_nhash *nhash);
+int is_longer_wh(struct aufs_nhash *whlist, aufs_bindex_t btgt, int limit);
+int test_known_wh(struct aufs_nhash *whlist, char *name, int namelen);
+int append_wh(struct aufs_nhash *whlist, char *name, int namelen,
+	      aufs_bindex_t bindex);
+void free_vdir(struct aufs_vdir *vdir);
+int au_init_vdir(struct file *file);
+int au_fill_de(struct file *file, void *dirent, filldir_t filldir);
+
+/* ---------------------------------------------------------------------- */
+
+static inline
+unsigned int au_name_hash(const unsigned char *name, unsigned int len)
+{
+	return (full_name_hash(name, len) % AUFS_NHASH_SIZE);
+}
+
+#endif /* __KERNEL__ */
+#endif /* __AUFS_DIR_H__ */
diff --git a/fs/aufs/export.c b/fs/aufs/export.c
new file mode 100755
index 0000000..7b1c6ac
--- /dev/null
+++ b/fs/aufs/export.c
@@ -0,0 +1,585 @@
+/*
+ * Copyright (C) 2007 Junjiro Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+/* $Id: export.c,v 1.7 2007/05/14 03:38:24 sfjro Exp $ */
+
+#include "aufs.h"
+
+extern struct export_operations export_op_default;
+#define CALL(ops, func)	(((ops)->func) ? ((ops)->func) : export_op_default.func)
+#define is_anon(d)	((d)->d_flags & DCACHE_DISCONNECTED)
+
+union conv {
+#if BITS_PER_LONG == 32
+	__u32 a[1];
+#else
+	__u32 a[2];
+#endif
+	ino_t ino;
+};
+
+static ino_t decode_ino(__u32 *a)
+{
+	union conv u;
+	u.a[0] = a[0];
+#if BITS_PER_LONG == 64
+	u.a[1] = a[1];
+#endif
+	return u.ino;
+}
+
+static void encode_ino(__u32 *a, ino_t ino)
+{
+	union conv u;
+	u.ino = ino;
+	a[0] = u.a[0];
+#if BITS_PER_LONG == 64
+	a[1] = u.a[1];
+#endif
+}
+
+static void decode_br_id_sigen(__u32 a, aufs_bindex_t *br_id,
+			       aufs_bindex_t *sigen)
+{
+	BUILD_BUG_ON((sizeof(*br_id) + sizeof(*sigen)) > sizeof(a));
+	*br_id = a >> 16;
+	DEBUG_ON(*br_id < 0);
+	*sigen = a;
+	DEBUG_ON(*sigen < 0);
+}
+
+static __u32 encode_br_id_sigen(aufs_bindex_t br_id, aufs_bindex_t sigen)
+{
+	DEBUG_ON(br_id < 0 || sigen < 0);
+	return (br_id << 16) | sigen;
+}
+
+/* NFS file handle */
+enum {
+	/* support 64bit inode number */
+	/* but untested */
+	Fh_br_id_sigen,
+	Fh_ino1,
+#if BITS_PER_LONG == 64
+	Fh_ino2,
+#endif
+	Fh_dir_ino1,
+#if BITS_PER_LONG == 64
+	Fh_dir_ino2,
+#endif
+	Fh_h_ino1,
+#if BITS_PER_LONG == 64
+	Fh_h_ino2,
+#endif
+	Fh_h_igen,
+	Fh_h_type,
+	Fh_tail,
+
+	Fh_ino = Fh_ino1,
+	Fh_dir_ino = Fh_dir_ino1,
+	Fh_h_ino = Fh_h_ino1,
+};
+
+/* ---------------------------------------------------------------------- */
+
+static struct dentry *decode_by_ino(struct super_block *sb, ino_t ino,
+				    ino_t dir_ino)
+{
+	struct dentry *dentry;
+	struct inode *inode;
+
+	LKTRTrace("i%lu, diri%lu\n", ino, dir_ino);
+
+	dentry = NULL;
+	inode = ilookup(sb, ino);
+	if (unlikely(!inode))
+		goto out;
+
+	dentry = ERR_PTR(-ESTALE);
+	if (unlikely(is_bad_inode(inode)))
+		goto out_iput;
+
+	dentry = NULL;
+	if (!S_ISDIR(inode->i_mode)) {
+		struct dentry *d;
+		spin_lock(&dcache_lock);
+		list_for_each_entry(d, &inode->i_dentry, d_alias)
+			if (!is_anon(d)
+			    && d->d_parent->d_inode->i_ino == dir_ino) {
+				dentry = dget_locked(d);
+				break;
+			}
+		spin_unlock(&dcache_lock);
+	} else {
+		dentry = d_find_alias(inode);
+		if (dentry
+		    && !is_anon(dentry)
+		    && dentry->d_parent->d_inode->i_ino == dir_ino)
+			goto out_iput; /* success */
+
+		dput(dentry);
+		dentry = NULL;
+	}
+
+ out_iput:
+	iput(inode);
+ out:
+	TraceErrPtr(dentry);
+	return dentry;
+}
+
+/* ---------------------------------------------------------------------- */
+
+struct find_name_by_ino {
+	int called, found;
+	ino_t ino;
+	char *name;
+	int namelen;
+};
+
+static int
+find_name_by_ino(void *arg, const char *name, int namelen, loff_t offset,
+		 filldir_ino_t ino, unsigned int d_type)
+{
+	struct find_name_by_ino *a = arg;
+
+	a->called++;
+	if (a->ino != ino)
+		return 0;
+
+	memcpy(a->name, name, namelen);
+	a->namelen = namelen;
+	a->found = 1;
+	return 1;
+}
+
+static struct dentry *decode_by_dir_ino(struct super_block *sb, ino_t ino,
+					ino_t dir_ino)
+{
+	struct dentry *dentry, *parent;
+	struct inode *dir;
+	struct find_name_by_ino arg;
+	struct file *file;
+	int err;
+
+	LKTRTrace("i%lu, diri%lu\n", ino, dir_ino);
+
+	dentry = NULL;
+	dir = ilookup(sb, dir_ino);
+	if (unlikely(!dir))
+		goto out;
+
+	dentry = ERR_PTR(-ESTALE);
+	if (unlikely(is_bad_inode(dir)))
+		goto out_iput;
+
+	dentry = NULL;
+	parent = d_find_alias(dir);
+	if (parent) {
+		if (unlikely(is_anon(parent))) {
+			dput(parent);
+			goto out_iput;
+		}
+	} else
+		goto out_iput;
+
+	file = dentry_open(parent, NULL, au_dir_roflags);
+	dentry = (void*)file;
+	if (IS_ERR(file))
+		goto out_iput;
+
+	dentry = ERR_PTR(-ENOMEM);
+	arg.name = __getname();
+	if (unlikely(!arg.name))
+		goto out_fput;
+	arg.ino = ino;
+	arg.found = 0;
+
+	do {
+		arg.called = 0;
+		//smp_mb();
+		err = vfsub_readdir(file, find_name_by_ino, &arg, /*dlgt*/0);
+	} while (!err && !arg.found && arg.called);
+	dentry = ERR_PTR(err);
+	if (arg.found) {
+		/* do not call lkup_one(), nor dlgt */
+		i_lock(dir);
+		dentry = lookup_one_len(arg.name, parent, arg.namelen);
+		i_unlock(dir);
+		TraceErrPtr(dentry);
+	}
+
+	//out_putname:
+	__putname(arg.name);
+ out_fput:
+	fput(file);
+ out_iput:
+	iput(dir);
+ out:
+	TraceErrPtr(dentry);
+	return dentry;
+}
+
+/* ---------------------------------------------------------------------- */
+
+struct append_name {
+	int found, called, len;
+	char *h_path;
+	ino_t h_ino;
+};
+
+static int append_name(void *arg, const char *name, int len, loff_t pos,
+		       filldir_ino_t ino, unsigned int d_type)
+{
+	struct append_name *a = arg;
+	char *p;
+
+	a->called++;
+	if (ino != a->h_ino)
+		return 0;
+
+	DEBUG_ON(len == 1 && *name == '.');
+	DEBUG_ON(len == 2 && name[0] == '.' && name[1] == '.');
+	a->len = strlen(a->h_path);
+	memmove(a->h_path - a->len - 1, a->h_path, a->len);
+	a->h_path -= a->len + 1;
+	p = a->h_path + a->len;
+	*p++ = '/';
+	memcpy(p, name, a->len);
+	a->len += 1 + len;
+	a->found++;
+	return 1;
+}
+
+static int h_acceptable(void *expv, struct dentry *dentry)
+{
+	return 1;
+}
+
+static struct dentry*
+decode_by_path(struct super_block *sb, aufs_bindex_t bindex, __u32 *fh,
+	       int fh_len, void *context)
+{
+	struct dentry *dentry, *h_parent, *root, *h_root;
+	struct super_block *h_sb;
+	char *path, *p;
+	struct vfsmount *h_mnt;
+	struct append_name arg;
+	int len, err;
+	struct file *h_file;
+	struct nameidata nd;
+	struct aufs_branch *br;
+
+	LKTRTrace("b%d\n", bindex);
+	SiMustAnyLock(sb);
+
+	br = stobr(sb, bindex);
+	//br_get(br);
+	h_mnt = br->br_mnt;
+	h_sb = h_mnt->mnt_sb;
+	LKTRTrace("%s, h_decode_fh\n", au_sbtype(h_sb));
+	h_parent = CALL(h_sb->s_export_op, decode_fh)
+		(h_sb, fh + Fh_tail, fh_len - Fh_tail, fh[Fh_h_type],
+		 h_acceptable, /*context*/NULL);
+	dentry = h_parent;
+	if (unlikely(!h_parent || IS_ERR(h_parent))) {
+		Warn1("%s decode_fh failed\n", au_sbtype(h_sb));
+		goto out;
+	}
+	dentry = NULL;
+	if (unlikely(is_anon(h_parent))) {
+		Warn1("%s decode_fh returned a disconnected dentry\n",
+		      au_sbtype(h_sb));
+		dput(h_parent);
+		goto out;
+	}
+
+	dentry = ERR_PTR(-ENOMEM);
+	path = __getname();
+	if (unlikely(!path)) {
+		dput(h_parent);
+		goto out;
+	}
+
+	root = sb->s_root;
+	di_read_lock_parent(root, !AUFS_I_RLOCK);
+	h_root = au_h_dptr_i(root, bindex);
+	di_read_unlock(root, !AUFS_I_RLOCK);
+	arg.h_path = d_path(h_root, h_mnt, path, PATH_MAX);
+	dentry = (void*)arg.h_path;
+	if (unlikely(!arg.h_path || IS_ERR(arg.h_path)))
+		goto out_putname;
+	len = strlen(arg.h_path);
+	arg.h_path = d_path(h_parent, h_mnt, path, PATH_MAX);
+	dentry = (void*)arg.h_path;
+	if (unlikely(!arg.h_path || IS_ERR(arg.h_path)))
+		goto out_putname;
+	LKTRTrace("%s\n", arg.h_path);
+	if (len != 1)
+		arg.h_path += len;
+	LKTRTrace("%s\n", arg.h_path);
+
+	/* cf. fs/exportfs/expfs.c */
+	h_file = dentry_open(h_parent, NULL, au_dir_roflags);
+	dentry = (void*)h_file;
+	if (IS_ERR(h_file))
+		goto out_putname;
+
+	arg.found = 0;
+	arg.h_ino = decode_ino(fh + Fh_h_ino);
+	do {
+		arg.called = 0;
+		err = vfsub_readdir(h_file, append_name, &arg, /*dlgt*/0);
+	} while (!err && !arg.found && arg.called);
+	LKTRTrace("%s, %d\n", arg.h_path, arg.len);
+
+	p = d_path(root, stosi(sb)->si_mnt, path, PATH_MAX - arg.len - 2);
+	dentry = (void*)p;
+	if (unlikely(!p || IS_ERR(p)))
+		goto out_fput;
+	p[strlen(p)] = '/';
+	LKTRTrace("%s\n", p);
+
+	err = path_lookup(p, LOOKUP_FOLLOW, &nd);
+	dentry = ERR_PTR(err);
+	if (!err) {
+		dentry = dget(nd.dentry);
+		if (unlikely(is_anon(dentry))) {
+			dput(dentry);
+			dentry = ERR_PTR(-ESTALE);
+		}
+		path_release(&nd);
+	}
+
+ out_fput:
+	fput(h_file);
+ out_putname:
+	__putname(path);
+ out:
+	//br_put(br);
+	TraceErrPtr(dentry);
+	return dentry;
+}
+
+/* ---------------------------------------------------------------------- */
+
+static struct dentry*
+aufs_decode_fh(struct super_block *sb, __u32 *fh, int fh_len, int fh_type,
+	       int (*acceptable)(void *context, struct dentry *de),
+	       void *context)
+{
+	struct dentry *dentry;
+	ino_t ino, dir_ino;
+	aufs_bindex_t bindex, br_id, sigen_v;
+	struct inode *inode, *h_inode;
+
+	//au_debug_on();
+	LKTRTrace("%d, fh{i%u, br_id_sigen 0x%x, hi%u}\n",
+		  fh_type, fh[Fh_ino], fh[Fh_br_id_sigen], fh[Fh_h_ino]);
+	DEBUG_ON(fh_len < Fh_tail);
+
+	si_read_lock(sb);
+	lockdep_off();
+
+	/* branch id may be wrapped around */
+	dentry = ERR_PTR(-ESTALE);
+	decode_br_id_sigen(fh[Fh_br_id_sigen], &br_id, &sigen_v);
+	bindex = find_brindex(sb, br_id);
+	if (unlikely(bindex < 0 || au_sigen(sb) < sigen_v))
+		goto out;
+
+	/* is this inode still cached? */
+	ino = decode_ino(fh + Fh_ino);
+	dir_ino = decode_ino(fh + Fh_dir_ino);
+	dentry = decode_by_ino(sb, ino, dir_ino);
+	if (IS_ERR(dentry))
+		goto out;
+	if (dentry)
+		goto accept;
+
+	/* is the parent dir cached? */
+	dentry = decode_by_dir_ino(sb, ino, dir_ino);
+	if (IS_ERR(dentry))
+		goto out;
+	if (dentry)
+		goto accept;
+
+	/* lookup path */
+	dentry = decode_by_path(sb, bindex, fh, fh_len, context);
+	if (IS_ERR(dentry))
+		goto out;
+	if (unlikely(!dentry))
+		goto out_stale;
+	if (unlikely(dentry->d_inode->i_ino != ino))
+		goto out_dput;
+
+ accept:
+	inode = dentry->d_inode;
+	h_inode = NULL;
+	ii_read_lock_child(inode);
+	if (ibstart(inode) <= bindex && bindex <= ibend(inode))
+		h_inode = au_h_iptr_i(inode, bindex);
+	ii_read_unlock(inode);
+	if (h_inode
+	    && h_inode->i_generation == fh[Fh_h_igen]
+	    && acceptable(context, dentry))
+		goto out; /* success */
+ out_dput:
+	dput(dentry);
+ out_stale:
+	dentry = ERR_PTR(-ESTALE);
+ out:
+	lockdep_on();
+	si_read_unlock(sb);
+	TraceErrPtr(dentry);
+	//au_debug_off();
+	return dentry;
+}
+
+/* ---------------------------------------------------------------------- */
+
+static int aufs_encode_fh(struct dentry *dentry, __u32 *fh, int *max_len,
+			  int connectable)
+{
+	int err;
+	struct super_block *sb, *h_sb;
+	struct inode *inode, *h_inode, *dir;
+	aufs_bindex_t bindex;
+	union conv u;
+	struct dentry *parent, *h_parent;
+
+	//au_debug_on();
+	BUILD_BUG_ON(sizeof(u.ino) != sizeof(u.a));
+	LKTRTrace("%.*s, max %d, conn %d\n",
+		  DLNPair(dentry), *max_len, connectable);
+	DEBUG_ON(is_anon(dentry));
+	inode = dentry->d_inode;
+	DEBUG_ON(!inode);
+	parent = dentry->d_parent;
+	DEBUG_ON(is_anon(parent));
+
+	err = -ENOSPC;
+	if (unlikely(*max_len <= Fh_tail)) {
+		Warn1("NFSv2 client (max_len %d)?\n", *max_len);
+		goto out;
+	}
+
+	sb = dentry->d_sb;
+	si_read_lock(sb);
+	di_read_lock_child(dentry, AUFS_I_RLOCK);
+	di_read_lock_parent(parent, AUFS_I_RLOCK);
+#ifdef CONFIG_AUFS_DEBUG
+	if (unlikely(!au_flag_test(sb, AuFlag_XINO)))
+		Warn1("NFS-exporting requires xino\n");
+#if 0
+	if (unlikely(au_flag_test(sb, AuFlag_UDBA_INOTIFY)))
+		Warn1("udba=inotify is not recommended when exporting\n");
+#endif
+#endif
+
+	err = -EPERM;
+	bindex = ibstart(inode);
+	h_sb = sbr_sb(sb, bindex);
+	if (unlikely(!h_sb->s_export_op)) {
+		Err1("%s branch is not exportable\n", au_sbtype(h_sb));
+		goto out_unlock;
+	}
+
+#if 0 //def CONFIG_AUFS_ROBR
+	if (unlikely(SB_AUFS(h_sb))) {
+		Err1("aufs branch is not supported\n");
+		goto out_unlock;
+	}
+#endif
+
+	/* doesn't support pseudo-link */
+	if (unlikely(bindex < dbstart(dentry)
+		     || dbend(dentry) < bindex
+		     || !au_h_dptr_i(dentry, bindex))) {
+		Err("%.*s/%.*s, b%d, pseudo-link?\n",
+		    DLNPair(dentry->d_parent), DLNPair(dentry), bindex);
+		goto out_unlock;
+	}
+
+	fh[Fh_br_id_sigen] = encode_br_id_sigen(sbr_id(sb, bindex),
+						au_sigen(sb));
+	encode_ino(fh + Fh_ino, inode->i_ino);
+	dir = parent->d_inode;
+	encode_ino(fh + Fh_dir_ino, dir->i_ino);
+	h_inode = au_h_iptr(inode);
+	encode_ino(fh + Fh_h_ino, h_inode->i_ino);
+	fh[Fh_h_igen] = h_inode->i_generation;
+
+	/* it should be set at exporting time */
+	if (unlikely(!h_sb->s_export_op->find_exported_dentry)) {
+		Warn("set default find_exported_dentry for %s\n",
+		     au_sbtype(h_sb));
+		h_sb->s_export_op->find_exported_dentry = find_exported_dentry;
+	}
+
+	*max_len -= Fh_tail;
+	//LKTRTrace("Fh_tail %d, max_len %d\n", Fh_tail, *max_len);
+	h_parent = au_h_dptr_i(parent, bindex);
+	DEBUG_ON(is_anon(h_parent));
+	err = fh[Fh_h_type] = CALL(h_sb->s_export_op, encode_fh)
+		(h_parent, fh + Fh_tail, max_len, connectable);
+	*max_len += Fh_tail;
+	if (err != 255)
+		err = 2; //??
+	else
+		Warn1("%s encode_fh failed\n", au_sbtype(h_sb));
+
+ out_unlock:
+	di_read_unlock(parent, AUFS_I_RLOCK);
+	aufs_read_unlock(dentry, AUFS_I_RLOCK);
+ out:
+	TraceErr(err);
+	//au_debug_off();
+	if (unlikely(err < 0))
+		err = 255;
+	return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+#if 0
+struct export_operations {
+	struct dentry *(*decode_fh)(struct super_block *sb, __u32 *fh, int fh_len, int fh_type,
+			 int (*acceptable)(void *context, struct dentry *de),
+			 void *context);
+	int (*encode_fh)(struct dentry *de, __u32 *fh, int *max_len,
+			 int connectable);
+
+	/* the following are only called from the filesystem itself */
+	int (*get_name)(struct dentry *parent, char *name,
+			struct dentry *child);
+	struct dentry * (*get_parent)(struct dentry *child);
+	struct dentry * (*get_dentry)(struct super_block *sb, void *inump);
+
+	/* This is set by the exporting module to a standard helper */
+	struct dentry * (*find_exported_dentry)(
+		struct super_block *sb, void *obj, void *parent,
+		int (*acceptable)(void *context, struct dentry *de),
+		void *context);
+};
+#endif
+
+struct export_operations aufs_export_op = {
+	.decode_fh = aufs_decode_fh,
+	.encode_fh = aufs_encode_fh
+};
diff --git a/fs/aufs/f_op.c b/fs/aufs/f_op.c
new file mode 100755
index 0000000..3cd1081
--- /dev/null
+++ b/fs/aufs/f_op.c
@@ -0,0 +1,684 @@
+/*
+ * Copyright (C) 2005, 2006, 2007 Junjiro Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+/* $Id: f_op.c,v 1.27 2007/05/14 03:38:24 sfjro Exp $ */
+
+#include <linux/fsnotify.h>
+#include <linux/pagemap.h>
+#include <linux/poll.h>
+#include <linux/security.h>
+#include <linux/version.h>
+#include "aufs.h"
+
+/* common function to regular file and dir */
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,18)
+#define FlushArgs	hidden_file, id
+int aufs_flush(struct file *file, fl_owner_t id)
+#else
+#define FlushArgs	hidden_file
+int aufs_flush(struct file *file)
+#endif
+{
+	int err;
+	struct dentry *dentry;
+	aufs_bindex_t bindex, bend;
+
+	dentry = file->f_dentry;
+	LKTRTrace("%.*s\n", DLNPair(dentry));
+
+	// aufs_read_lock_file()
+	si_read_lock(dentry->d_sb);
+	fi_read_lock(file);
+	di_read_lock_child(dentry, !AUFS_I_RLOCK);
+
+	err = 0;
+	bend = fbend(file);
+	for (bindex = fbstart(file); !err && bindex <= bend; bindex++) {
+		struct file *hidden_file;
+		hidden_file = au_h_fptr_i(file, bindex);
+		if (hidden_file && hidden_file->f_op
+		    && hidden_file->f_op->flush)
+			err = hidden_file->f_op->flush(FlushArgs);
+	}
+
+	di_read_unlock(dentry, !AUFS_I_RLOCK);
+	fi_read_unlock(file);
+	si_read_unlock(dentry->d_sb);
+	TraceErr(err);
+	return err;
+}
+#undef FlushArgs
+
+/* ---------------------------------------------------------------------- */
+
+static int do_open_nondir(struct file *file, int flags)
+{
+	int err;
+	aufs_bindex_t bindex;
+	struct super_block *sb;
+	struct file *hidden_file;
+	struct dentry *dentry;
+	struct inode *inode;
+	struct aufs_finfo *finfo;
+
+	dentry = file->f_dentry;
+	LKTRTrace("%.*s, flags 0%o\n", DLNPair(dentry), flags);
+	FiMustWriteLock(file);
+	inode = dentry->d_inode;
+	DEBUG_ON(!inode || S_ISDIR(inode->i_mode));
+
+	err = 0;
+	finfo = ftofi(file);
+	finfo->fi_h_vm_ops = NULL;
+	sb = dentry->d_sb;
+	bindex = dbstart(dentry);
+	DEBUG_ON(!au_h_dptr(dentry)->d_inode);
+	/* O_TRUNC is processed already */
+	BUG_ON(test_ro(sb, bindex, inode) && (flags & O_TRUNC));
+
+	hidden_file = hidden_open(dentry, bindex, flags);
+	//if (LktrCond) {fput(hidden_file); br_put(stobr(dentry->d_sb, bindex));
+	//hidden_file = ERR_PTR(-1);}
+	if (!IS_ERR(hidden_file)) {
+		set_fbstart(file, bindex);
+		set_fbend(file, bindex);
+		set_h_fptr(file, bindex, hidden_file);
+		return 0; /* success */
+	}
+	err = PTR_ERR(hidden_file);
+	TraceErr(err);
+	return err;
+}
+
+static int aufs_open_nondir(struct inode *inode, struct file *file)
+{
+	return au_do_open(inode, file, do_open_nondir);
+}
+
+static int aufs_release_nondir(struct inode *inode, struct file *file)
+{
+	struct super_block *sb = file->f_dentry->d_sb;
+
+	LKTRTrace("i%lu, %.*s\n", inode->i_ino, DLNPair(file->f_dentry));
+
+	si_read_lock(sb);
+	au_fin_finfo(file);
+	si_read_unlock(sb);
+	return 0;
+}
+
+/* ---------------------------------------------------------------------- */
+
+static ssize_t aufs_read(struct file *file, char __user *buf, size_t count,
+			 loff_t *ppos)
+{
+	ssize_t err;
+	struct dentry *dentry;
+	struct file *hidden_file;
+	struct super_block *sb;
+	struct inode *h_inode;
+	int dlgt;
+
+	dentry = file->f_dentry;
+	LKTRTrace("%.*s, cnt %lu, pos %Ld\n",
+		  DLNPair(dentry), (unsigned long)count, *ppos);
+
+	sb = dentry->d_sb;
+	si_read_lock(sb);
+	err = au_reval_and_lock_finfo(file, au_reopen_nondir, /*wlock*/0,
+				      /*locked*/0);
+	//if (LktrCond) {fi_read_unlock(file); err = -1;}
+	if (unlikely(err))
+		goto out;
+
+	/* support LSM and notify */
+	dlgt = need_dlgt(sb);
+	hidden_file = au_h_fptr(file);
+	h_inode = hidden_file->f_dentry->d_inode;
+	if (!au_flag_test(sb, AuFlag_UDBA_INOTIFY))
+		err = vfsub_read_u(hidden_file, buf, count, ppos, dlgt);
+	else {
+		struct inode *dir = dentry->d_parent->d_inode,
+			*h_dir = hidden_file->f_dentry->d_parent->d_inode;
+		aufs_bindex_t bstart = fbstart(file);
+		hdir_lock(h_dir, dir, bstart);
+		err = vfsub_read_u(hidden_file, buf, count, ppos, dlgt);
+		hdir_unlock(h_dir, dir, bstart);
+	}
+	memcpy(&file->f_ra, &hidden_file->f_ra, sizeof(file->f_ra)); //??
+	dentry->d_inode->i_atime = hidden_file->f_dentry->d_inode->i_atime;
+
+	fi_read_unlock(file);
+ out:
+	si_read_unlock(sb);
+	TraceErr(err);
+	return err;
+}
+
+static ssize_t aufs_write(struct file *file, const char __user *__buf,
+			  size_t count, loff_t *ppos)
+{
+	ssize_t err;
+	struct dentry *dentry;
+	struct inode *inode;
+	struct super_block *sb;
+	struct file *hidden_file;
+	char __user *buf = (char __user*)__buf;
+	struct inode *h_inode;
+	int dlgt;
+
+	dentry = file->f_dentry;
+	LKTRTrace("%.*s, cnt %lu, pos %Ld\n",
+		  DLNPair(dentry), (unsigned long)count, *ppos);
+
+	inode = dentry->d_inode;
+	i_lock(inode);
+	sb = dentry->d_sb;
+	si_read_lock(sb);
+	err = au_reval_and_lock_finfo(file, au_reopen_nondir, /*wlock*/1,
+				      /*locked*/1);
+	//if (LktrCond) {fi_write_unlock(file); err = -1;}
+	if (unlikely(err))
+		goto out;
+	err = au_ready_to_write(file, -1);
+	//if (LktrCond) err = -1;
+	if (unlikely(err))
+		goto out_unlock;
+
+	/* support LSM and notify */
+	dlgt = need_dlgt(sb);
+	hidden_file = au_h_fptr(file);
+	h_inode = hidden_file->f_dentry->d_inode;
+	if (!au_flag_test(sb, AuFlag_UDBA_INOTIFY))
+		err = vfsub_write_u(hidden_file, buf, count, ppos, dlgt);
+	else {
+		struct inode *dir = dentry->d_parent->d_inode,
+			*h_dir = hidden_file->f_dentry->d_parent->d_inode;
+		aufs_bindex_t bstart = fbstart(file);
+		hdir_lock(h_dir, dir, bstart);
+		err = vfsub_write_u(hidden_file, buf, count, ppos, dlgt);
+		hdir_unlock(h_dir, dir, bstart);
+	}
+	ii_write_lock_child(inode);
+	au_cpup_attr_timesizes(inode);
+	ii_write_unlock(inode);
+
+ out_unlock:
+	fi_write_unlock(file);
+ out:
+	si_read_unlock(sb);
+	i_unlock(inode);
+	TraceErr(err);
+	return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+#if 0 //def CONFIG_AUFS_ROBR
+struct lvma {
+	struct list_head list;
+	struct vm_area_struct *vma;
+};
+
+static struct file *safe_file(struct vm_area_struct *vma)
+{
+	struct file *file = vma->vm_file;
+	struct super_block *sb = file->f_dentry->d_sb;
+	struct lvma *lvma, *entry;
+	struct aufs_sbinfo *sbinfo;
+	int found, warn;
+
+	TraceEnter();
+	DEBUG_ON(!SB_AUFS(sb));
+
+	warn = 0;
+	found = 0;
+	sbinfo = stosi(sb);
+	spin_lock(&sbinfo->si_lvma_lock);
+	list_for_each_entry(entry, &sbinfo->si_lvma, list) {
+		found = (entry->vma == vma);
+		if (unlikely(found))
+			break;
+	}
+	if (!found) {
+		lvma = kmalloc(sizeof(*lvma), GFP_ATOMIC);
+		if (lvma) {
+			lvma->vma = vma;
+			list_add(&lvma->list, &sbinfo->si_lvma);
+		} else {
+			warn = 1;
+			file = NULL;
+		}
+	} else
+		file = NULL;
+	spin_unlock(&sbinfo->si_lvma_lock);
+
+	if (unlikely(warn))
+		Warn1("no memory for lvma\n");
+	return file;
+}
+
+static void reset_file(struct vm_area_struct *vma, struct file *file)
+{
+	struct super_block *sb = file->f_dentry->d_sb;
+	struct lvma *entry, *found;
+	struct aufs_sbinfo *sbinfo;
+
+	TraceEnter();
+	DEBUG_ON(!SB_AUFS(sb));
+
+	vma->vm_file = file;
+
+	found = NULL;
+	sbinfo = stosi(sb);
+	spin_lock(&sbinfo->si_lvma_lock);
+	list_for_each_entry(entry, &sbinfo->si_lvma, list)
+		if (entry->vma == vma){
+			found = entry;
+			break;
+		}
+	DEBUG_ON(!found);
+	list_del(&found->list);
+	spin_unlock(&sbinfo->si_lvma_lock);
+	kfree(found);
+}
+
+#else
+
+static struct file *safe_file(struct vm_area_struct *vma)
+{
+	struct file *file;
+
+	file = vma->vm_file;
+	if (file->private_data && au_is_aufs(file->f_dentry->d_sb))
+		return file;
+	return NULL;
+}
+
+static void reset_file(struct vm_area_struct *vma, struct file *file)
+{
+	vma->vm_file = file;
+	smp_mb();
+}
+#endif /* CONFIG_AUFS_ROBR */
+
+static struct page *aufs_nopage(struct vm_area_struct *vma, unsigned long addr,
+				int *type)
+{
+	struct page *page;
+	struct dentry *dentry;
+	struct file *file, *hidden_file;
+	struct inode *inode;
+	static DECLARE_WAIT_QUEUE_HEAD(wq);
+	struct aufs_finfo *finfo;
+
+	TraceEnter();
+	DEBUG_ON(!vma || !vma->vm_file);
+	wait_event(wq, (file = safe_file(vma)));
+	DEBUG_ON(!au_is_aufs(file->f_dentry->d_sb));
+	dentry = file->f_dentry;
+	LKTRTrace("%.*s, addr %lx\n", DLNPair(dentry), addr);
+	inode = dentry->d_inode;
+	DEBUG_ON(!S_ISREG(inode->i_mode));
+
+	// do not revalidate, nor lock
+	finfo = ftofi(file);
+	hidden_file = finfo->fi_hfile[0 + finfo->fi_bstart].hf_file;
+	DEBUG_ON(!hidden_file || !au_is_mmapped(file));
+	vma->vm_file = hidden_file;
+	//smp_mb();
+	page = finfo->fi_h_vm_ops->nopage(vma, addr, type);
+	reset_file(vma, file);
+#if 0 //def CONFIG_SMP
+	//wake_up_nr(&wq, online_cpu - 1);
+	wake_up_all(&wq);
+#else
+	wake_up(&wq);
+#endif
+	if (!IS_ERR(page)) {
+		//page->mapping = file->f_mapping;
+		//get_page(page);
+		//file->f_mapping = hidden_file->f_mapping;
+		//touch_atime(NULL, dentry);
+		//inode->i_atime = hidden_file->f_dentry->d_inode->i_atime;
+	}
+	TraceErrPtr(page);
+	return page;
+}
+
+static int aufs_populate(struct vm_area_struct *vma, unsigned long addr,
+			 unsigned long len, pgprot_t prot, unsigned long pgoff,
+			 int nonblock)
+{
+	Err("please report me this application\n");
+	BUG();
+	return ftofi(vma->vm_file)->fi_h_vm_ops->populate
+		(vma, addr, len, prot, pgoff, nonblock);
+}
+
+static struct vm_operations_struct aufs_vm_ops = {
+	//.open		= aufs_vmaopen,
+	//.close		= aufs_vmaclose,
+	.nopage		= aufs_nopage,
+	.populate	= aufs_populate,
+	//page_mkwrite(struct vm_area_struct *vma, struct page *page)
+};
+
+/* ---------------------------------------------------------------------- */
+
+static int aufs_mmap(struct file *file, struct vm_area_struct *vma)
+{
+	int err, wlock, mmapped;
+	struct dentry *dentry;
+	struct super_block *sb;
+	struct file *h_file;
+	struct vm_operations_struct *vm_ops;
+	unsigned long flags;
+
+	dentry = file->f_dentry;
+	LKTRTrace("%.*s, %lx, len %lu\n",
+		  DLNPair(dentry), vma->vm_start, vma->vm_end - vma->vm_start);
+	DEBUG_ON(!S_ISREG(dentry->d_inode->i_mode));
+	DEBUG_ON(down_write_trylock(&vma->vm_mm->mmap_sem));
+
+	mmapped = au_is_mmapped(file);
+	wlock = 0;
+	if (file->f_mode & FMODE_WRITE) {
+		flags = VM_SHARED | VM_WRITE;
+		wlock = ((flags & vma->vm_flags) == flags);
+	}
+
+	sb = dentry->d_sb;
+	si_read_lock(sb);
+	err = au_reval_and_lock_finfo(file, au_reopen_nondir,
+				      wlock | !mmapped, /*locked*/0);
+	//err = -1;
+	if (unlikely(err))
+		goto out;
+
+	if (wlock) {
+		err = au_ready_to_write(file, -1);
+		//err = -1;
+		if (unlikely(err))
+			goto out_unlock;
+	}
+
+	h_file = au_h_fptr(file);
+	vm_ops = ftofi(file)->fi_h_vm_ops;
+	if (unlikely(!mmapped)) {
+		// nfs uses some locks
+		lockdep_off();
+		err = h_file->f_op->mmap(h_file, vma);
+		lockdep_on();
+		if (unlikely(err))
+			goto out_unlock;
+		vm_ops = vma->vm_ops;
+		DEBUG_ON(!vm_ops);
+		err = do_munmap(current->mm, vma->vm_start,
+				vma->vm_end - vma->vm_start);
+		if (unlikely(err)) {
+			IOErr("failed internal unmapping %.*s, %d\n",
+			      DLNPair(h_file->f_dentry), err);
+			err = -EIO;
+			goto out_unlock;
+		}
+	}
+	DEBUG_ON(!vm_ops);
+
+	err = generic_file_mmap(file, vma);
+	if (!err) {
+		file_accessed(h_file);
+		dentry->d_inode->i_atime = h_file->f_dentry->d_inode->i_atime;
+		vma->vm_ops = &aufs_vm_ops;
+		if (unlikely(!mmapped))
+			ftofi(file)->fi_h_vm_ops = vm_ops;
+	}
+
+ out_unlock:
+	if (!wlock && mmapped)
+		fi_read_unlock(file);
+	else
+		fi_write_unlock(file);
+ out:
+	si_read_unlock(sb);
+	TraceErr(err);
+	return err;
+}
+
+// todo: try do_sendfile() in fs/read_write.c
+static ssize_t aufs_sendfile(struct file *file, loff_t *ppos,
+			     size_t count, read_actor_t actor, void *target)
+{
+	ssize_t err;
+	struct file *h_file;
+	const char c = current->comm[4];
+	/* true if a kernel thread named 'loop[0-9].*' accesses a file */
+	const int loopback = (current->mm == NULL
+			      && '0' <= c && c <= '9'
+			      && strncmp(current->comm, "loop", 4) == 0);
+	struct dentry *dentry;
+	struct super_block *sb;
+
+	dentry = file->f_dentry;
+	LKTRTrace("%.*s, pos %Ld, cnt %lu, loopback %d\n",
+		  DLNPair(dentry), *ppos, (unsigned long)count, loopback);
+
+	sb = dentry->d_sb;
+	si_read_lock(sb);
+	err = au_reval_and_lock_finfo(file, au_reopen_nondir, /*wlock*/0,
+				      /*locked*/0);
+	if (unlikely(err))
+		goto out;
+
+	err = -EINVAL;
+	h_file = au_h_fptr(file);
+	if (h_file->f_op && h_file->f_op->sendfile) {
+		if (/* unlikely */(loopback)) {
+			file->f_mapping = h_file->f_mapping;
+			smp_mb(); //??
+		}
+		// nfs uses some locks
+		lockdep_off();
+		err = h_file->f_op->sendfile
+			(h_file, ppos, count, actor, target);
+		lockdep_on();
+		dentry->d_inode->i_atime = h_file->f_dentry->d_inode->i_atime;
+	}
+	fi_read_unlock(file);
+
+ out:
+	si_read_unlock(sb);
+	TraceErr(err);
+	return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+/* copied from linux/fs/select.h, must match */
+#define DEFAULT_POLLMASK (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM)
+
+static unsigned int aufs_poll(struct file *file, poll_table *wait)
+{
+	unsigned int mask;
+	struct file *hidden_file;
+	int err;
+	struct dentry *dentry;
+	struct super_block *sb;
+
+	dentry = file->f_dentry;
+	LKTRTrace("%.*s, wait %p\n", DLNPair(dentry), wait);
+	DEBUG_ON(S_ISDIR(dentry->d_inode->i_mode));
+
+	/* We should pretend an error happend. */
+	mask = POLLERR /* | POLLIN | POLLOUT */;
+	sb = dentry->d_sb;
+	si_read_lock(sb);
+	err = au_reval_and_lock_finfo(file, au_reopen_nondir, /*wlock*/0,
+				      /*locked*/0);
+	//err = -1;
+	if (unlikely(err))
+		goto out;
+
+	/* it is not an error of hidden_file has no operation */
+	mask = DEFAULT_POLLMASK;
+	hidden_file = au_h_fptr(file);
+	if (hidden_file->f_op && hidden_file->f_op->poll)
+		mask = hidden_file->f_op->poll(hidden_file, wait);
+	fi_read_unlock(file);
+
+ out:
+	si_read_unlock(sb);
+	TraceErr((int)mask);
+	return mask;
+}
+
+static int aufs_fsync_nondir(struct file *file, struct dentry *dentry,
+			     int datasync)
+{
+	int err, my_lock;
+	struct inode *inode;
+	struct file *hidden_file;
+	struct super_block *sb;
+
+	LKTRTrace("%.*s, %d\n", DLNPair(dentry), datasync);
+	inode = dentry->d_inode;
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,17)
+	IMustLock(inode);
+	my_lock = 0;
+#else
+	/* before 2.6.17,
+	 * msync(2) calls me without locking i_sem/i_mutex, but fsync(2).
+	 */
+	my_lock = !i_trylock(inode);
+#endif
+
+	sb = dentry->d_sb;
+	si_read_lock(sb);
+	err = 0; //-EBADF; // posix?
+	if (unlikely(!(file->f_mode & FMODE_WRITE)))
+		goto out;
+	err = au_reval_and_lock_finfo(file, au_reopen_nondir, /*wlock*/1,
+				      /*locked*/1);
+	//err = -1;
+	if (unlikely(err))
+		goto out;
+	err = au_ready_to_write(file, -1);
+	//err = -1;
+	if (unlikely(err))
+		goto out_unlock;
+
+	err = -EINVAL;
+	hidden_file = au_h_fptr(file);
+	if (hidden_file->f_op && hidden_file->f_op->fsync) {
+		// todo: apparmor thread?
+		//file->f_mapping->host->i_mutex
+		ii_write_lock_child(inode);
+		hi_lock_child(hidden_file->f_dentry->d_inode);
+		err = hidden_file->f_op->fsync
+			(hidden_file, hidden_file->f_dentry, datasync);
+		//err = -1;
+		au_cpup_attr_timesizes(inode);
+		i_unlock(hidden_file->f_dentry->d_inode);
+		ii_write_unlock(inode);
+	}
+
+ out_unlock:
+	fi_write_unlock(file);
+ out:
+	if (unlikely(my_lock))
+		i_unlock(inode);
+	si_read_unlock(sb);
+	TraceErr(err);
+	return err;
+}
+
+static int aufs_fasync(int fd, struct file *file, int flag)
+{
+	int err;
+	struct file *hidden_file;
+	struct dentry *dentry;
+	struct super_block *sb;
+
+	dentry = file->f_dentry;
+	LKTRTrace("%.*s, %d\n", DLNPair(dentry), flag);
+
+	sb = dentry->d_sb;
+	si_read_lock(sb);
+	err = au_reval_and_lock_finfo(file, au_reopen_nondir, /*wlock*/0,
+				      /*locked*/0);
+	//err = -1;
+	if (unlikely(err))
+		goto out;
+
+	hidden_file = au_h_fptr(file);
+	if (hidden_file->f_op && hidden_file->f_op->fasync)
+		err = hidden_file->f_op->fasync(fd, hidden_file, flag);
+	fi_read_unlock(file);
+
+ out:
+	si_read_unlock(sb);
+	TraceErr(err);
+	return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+#if 0 // comment
+struct file_operations {
+	struct module *owner;
+	loff_t (*llseek) (struct file *, loff_t, int);
+	ssize_t (*read) (struct file *, char __user *, size_t, loff_t *);
+	ssize_t (*aio_read) (struct kiocb *, char __user *, size_t, loff_t);
+	ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *);
+	ssize_t (*aio_write) (struct kiocb *, const char __user *, size_t, loff_t);
+	int (*readdir) (struct file *, void *, filldir_t);
+	unsigned int (*poll) (struct file *, struct poll_table_struct *);
+	int (*ioctl) (struct inode *, struct file *, unsigned int, unsigned long);
+	long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long);
+	long (*compat_ioctl) (struct file *, unsigned int, unsigned long);
+	int (*mmap) (struct file *, struct vm_area_struct *);
+	int (*open) (struct inode *, struct file *);
+	int (*flush) (struct file *);
+	int (*release) (struct inode *, struct file *);
+	int (*fsync) (struct file *, struct dentry *, int datasync);
+	int (*aio_fsync) (struct kiocb *, int datasync);
+	int (*fasync) (int, struct file *, int);
+	int (*lock) (struct file *, int, struct file_lock *);
+	ssize_t (*readv) (struct file *, const struct iovec *, unsigned long, loff_t *);
+	ssize_t (*writev) (struct file *, const struct iovec *, unsigned long, loff_t *);
+	ssize_t (*sendfile) (struct file *, loff_t *, size_t, read_actor_t, void *);
+	ssize_t (*sendpage) (struct file *, struct page *, int, size_t, loff_t *, int);
+	unsigned long (*get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long);
+	int (*check_flags)(int);
+	int (*dir_notify)(struct file *file, unsigned long arg);
+	int (*flock) (struct file *, int, struct file_lock *);
+};
+#endif
+
+struct file_operations aufs_file_fop = {
+	.read		= aufs_read,
+	.write		= aufs_write,
+	.poll		= aufs_poll,
+	.mmap		= aufs_mmap,
+	.open		= aufs_open_nondir,
+	.flush		= aufs_flush,
+	.release	= aufs_release_nondir,
+	.fsync		= aufs_fsync_nondir,
+	.fasync		= aufs_fasync,
+	.sendfile	= aufs_sendfile,
+};
diff --git a/fs/aufs/file.c b/fs/aufs/file.c
new file mode 100755
index 0000000..857a4e8
--- /dev/null
+++ b/fs/aufs/file.c
@@ -0,0 +1,832 @@
+/*
+ * Copyright (C) 2005, 2006, 2007 Junjiro Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+/* $Id: file.c,v 1.42 2007/05/14 03:39:09 sfjro Exp $ */
+
+//#include <linux/fsnotify.h>
+#include <linux/pagemap.h>
+//#include <linux/poll.h>
+//#include <linux/security.h>
+#include "aufs.h"
+
+/* drop flags for writing */
+unsigned int au_file_roflags(unsigned int flags)
+{
+	flags &= ~(O_WRONLY | O_RDWR | O_APPEND | O_CREAT | O_TRUNC);
+	flags |= O_RDONLY | O_NOATIME;
+	return flags;
+}
+
+/* common functions to regular file and dir */
+struct file *hidden_open(struct dentry *dentry, aufs_bindex_t bindex, int flags)
+{
+	struct dentry *hidden_dentry;
+	struct inode *hidden_inode;
+	struct super_block *sb;
+	struct vfsmount *hidden_mnt;
+	struct file *hidden_file;
+	struct aufs_branch *br;
+	loff_t old_size;
+	int udba;
+
+	LKTRTrace("%.*s, b%d, flags 0%o\n", DLNPair(dentry), bindex, flags);
+	DEBUG_ON(!dentry);
+	hidden_dentry = au_h_dptr_i(dentry, bindex);
+	DEBUG_ON(!hidden_dentry);
+	hidden_inode = hidden_dentry->d_inode;
+	DEBUG_ON(!hidden_inode);
+
+	sb = dentry->d_sb;
+	udba = au_flag_test(sb, AuFlag_UDBA_INOTIFY);
+	if (unlikely(udba)) {
+		// test here?
+	}
+
+	br = stobr(sb, bindex);
+	br_get(br);
+	/* drop flags for writing */
+	if (test_ro(sb, bindex, dentry->d_inode))
+		flags = au_file_roflags(flags);
+	flags &= ~O_CREAT;
+	spin_lock(&hidden_inode->i_lock);
+	old_size = i_size_read(hidden_inode);
+	spin_unlock(&hidden_inode->i_lock);
+
+	//DbgSleep(3);
+
+	dget(hidden_dentry);
+	hidden_mnt = mntget(br->br_mnt);
+	hidden_file = dentry_open(hidden_dentry, hidden_mnt, flags);
+	//if (LktrCond) {fput(hidden_file); hidden_file = ERR_PTR(-1);}
+
+	if (!IS_ERR(hidden_file)) {
+#if 0 // remove this
+		if (/* old_size && */ (flags & O_TRUNC)) {
+			au_direval_dec(dentry);
+			if (!IS_ROOT(dentry))
+				au_direval_dec(dentry->d_parent);
+		}
+#endif
+		return hidden_file;
+	}
+
+	br_put(br);
+	TraceErrPtr(hidden_file);
+	return hidden_file;
+}
+
+static int do_coo(struct dentry *dentry, aufs_bindex_t bstart)
+{
+	int err;
+	struct dentry *parent, *h_parent, *h_dentry;
+	aufs_bindex_t bcpup;
+	struct inode *h_dir, *h_inode, *dir;
+
+	LKTRTrace("%.*s\n", DLNPair(dentry));
+	DEBUG_ON(IS_ROOT(dentry));
+	DiMustWriteLock(dentry);
+
+	parent = dentry->d_parent; // dget_parent()
+	di_write_lock_parent(parent);
+	bcpup = err = find_rw_parent_br(dentry, bstart);
+	//bcpup = err = find_rw_br(sb, bstart);
+	if (unlikely(err < 0)) {
+		err = 0; // stop copyup, it is not an error
+		goto out;
+	}
+	err = 0;
+
+	h_parent = au_h_dptr_i(parent, bcpup);
+	if (!h_parent) {
+		err = cpup_dirs(dentry, bcpup, NULL);
+		if (unlikely(err))
+			goto out;
+		h_parent = au_h_dptr_i(parent, bcpup);
+	}
+
+	h_dir = h_parent->d_inode;
+	h_dentry = au_h_dptr_i(dentry, bstart);
+	h_inode = h_dentry->d_inode;
+	dir = parent->d_inode;
+	hdir_lock(h_dir, dir, bcpup);
+	hi_lock_child(h_inode);
+	DEBUG_ON(au_h_dptr_i(dentry, bcpup));
+	err = sio_cpup_simple(dentry, bcpup, -1,
+			      au_flags_cpup(CPUP_DTIME, parent));
+	TraceErr(err);
+	i_unlock(h_inode);
+	hdir_unlock(h_dir, dir, bcpup);
+
+ out:
+	di_write_unlock(parent);
+	TraceErr(err);
+	return err;
+}
+
+int au_do_open(struct inode *inode, struct file *file,
+	       int (*open)(struct file *file, int flags))
+{
+	int err, coo;
+	struct dentry *dentry;
+	struct super_block *sb;
+	aufs_bindex_t bstart;
+	struct inode *h_dir, *dir;
+
+	dentry = file->f_dentry;
+	LKTRTrace("i%lu, %.*s\n", inode->i_ino, DLNPair(dentry));
+
+	sb = dentry->d_sb;
+	si_read_lock(sb);
+	coo = 0;
+#if 0
+	switch (au_flag_test_coo(sb)) {
+	case AuFlag_COO_LEAF:
+		coo = !S_ISDIR(inode->i_mode);
+		break;
+	case AuFlag_COO_ALL:
+		coo = 1;
+		break;
+	}
+#endif
+	err = au_init_finfo(file);
+	//if (LktrCond) {fi_write_unlock(file); fin_finfo(file); err = -1;}
+	if (unlikely(err))
+		goto out;
+
+	if (!coo) {
+		di_read_lock_child(dentry, AUFS_I_RLOCK);
+		bstart = dbstart(dentry);
+	} else {
+		di_write_lock_child(dentry);
+		bstart = dbstart(dentry);
+		if (test_ro(sb, bstart, dentry->d_inode)) {
+			err = do_coo(dentry, bstart);
+			if (err) {
+				di_write_unlock(dentry);
+				goto out_finfo;
+			}
+			bstart = dbstart(dentry);
+		}
+		di_downgrade_lock(dentry, AUFS_I_RLOCK);
+	}
+
+	// todo: remove this extra locks
+	dir = dentry->d_parent->d_inode;
+	if (!IS_ROOT(dentry))
+		ii_read_lock_parent(dir);
+	h_dir = au_h_iptr_i(dir, bstart);
+	hdir_lock(h_dir, dir, bstart);
+	err = open(file, file->f_flags);
+	//if (LktrCond) err = -1;
+	hdir_unlock(h_dir, dir, bstart);
+	if (!IS_ROOT(dentry))
+		ii_read_unlock(dir);
+	di_read_unlock(dentry, AUFS_I_RLOCK);
+
+ out_finfo:
+	fi_write_unlock(file);
+	if (unlikely(err))
+		au_fin_finfo(file);
+	//DbgFile(file);
+ out:
+	si_read_unlock(sb);
+	TraceErr(err);
+	return err;
+}
+
+int au_reopen_nondir(struct file *file)
+{
+	int err;
+	struct dentry *dentry;
+	aufs_bindex_t bstart, bindex, bend;
+	struct file *hidden_file, *h_file_tmp;
+
+	dentry = file->f_dentry;
+	LKTRTrace("%.*s\n", DLNPair(dentry));
+	DEBUG_ON(S_ISDIR(dentry->d_inode->i_mode)
+		 || !au_h_dptr(dentry)->d_inode);
+	bstart = dbstart(dentry);
+
+	h_file_tmp = NULL;
+	if (fbstart(file) == bstart) {
+		hidden_file = au_h_fptr(file);
+		if (file->f_mode == hidden_file->f_mode)
+			return 0; /* success */
+		h_file_tmp = hidden_file;
+		get_file(h_file_tmp);
+		set_h_fptr(file, bstart, NULL);
+	}
+	DEBUG_ON(fbstart(file) < bstart
+		 || ftofi(file)->fi_hfile[0 + bstart].hf_file);
+
+	hidden_file = hidden_open(dentry, bstart, file->f_flags & ~O_TRUNC);
+	//if (LktrCond) {fput(hidden_file); br_put(stobr(dentry->d_sb, bstart));
+	//hidden_file = ERR_PTR(-1);}
+	err = PTR_ERR(hidden_file);
+	if (IS_ERR(hidden_file))
+		goto out; // close all?
+	err = 0;
+	//cpup_file_flags(hidden_file, file);
+	set_fbstart(file, bstart);
+	set_h_fptr(file, bstart, hidden_file);
+	memcpy(&hidden_file->f_ra, &file->f_ra, sizeof(file->f_ra)); //??
+
+	/* close lower files */
+	bend = fbend(file);
+	for (bindex = bstart + 1; bindex <= bend; bindex++)
+		set_h_fptr(file, bindex, NULL);
+	set_fbend(file, bstart);
+
+ out:
+	if (h_file_tmp)
+		fput(h_file_tmp);
+	TraceErr(err);
+	return err;
+}
+
+/*
+ * copyup the deleted file for writing.
+ */
+static int cpup_wh_file(struct file *file, aufs_bindex_t bdst, loff_t len)
+{
+	int err;
+	struct dentry *dentry, *parent, *hidden_parent, *tmp_dentry;
+	struct dentry *hidden_dentry_bstart, *hidden_dentry_bdst;
+	struct inode *hidden_dir;
+	aufs_bindex_t bstart;
+	struct aufs_dinfo *dinfo;
+	struct dtime dt;
+	struct lkup_args lkup;
+	struct super_block *sb;
+
+	dentry = file->f_dentry;
+	LKTRTrace("%.*s, bdst %d, len %Lu\n", DLNPair(dentry), bdst, len);
+	DEBUG_ON(S_ISDIR(dentry->d_inode->i_mode)
+		 || !(file->f_mode & FMODE_WRITE));
+	DiMustWriteLock(dentry);
+	parent = dentry->d_parent;
+	IiMustAnyLock(parent->d_inode);
+	hidden_parent = au_h_dptr_i(parent, bdst);
+	DEBUG_ON(!hidden_parent);
+	hidden_dir = hidden_parent->d_inode;
+	DEBUG_ON(!hidden_dir);
+	IMustLock(hidden_dir);
+
+	sb = parent->d_sb;
+	lkup.nfsmnt = au_nfsmnt(sb, bdst);
+	lkup.dlgt = need_dlgt(sb);
+	tmp_dentry = lkup_whtmp(hidden_parent, &dentry->d_name, &lkup);
+	//if (LktrCond) {dput(tmp_dentry); tmp_dentry = ERR_PTR(-1);}
+	err = PTR_ERR(tmp_dentry);
+	if (IS_ERR(tmp_dentry))
+		goto out;
+
+	dtime_store(&dt, parent, hidden_parent);
+	dinfo = dtodi(dentry);
+	bstart = dinfo->di_bstart;
+	hidden_dentry_bdst = dinfo->di_hdentry[0 + bdst].hd_dentry;
+	hidden_dentry_bstart = dinfo->di_hdentry[0 + bstart].hd_dentry;
+	dinfo->di_bstart = bdst;
+	dinfo->di_hdentry[0 + bdst].hd_dentry = tmp_dentry;
+	dinfo->di_hdentry[0 + bstart].hd_dentry = au_h_fptr(file)->f_dentry;
+	err = cpup_single(dentry, bdst, bstart, len,
+			  au_flags_cpup(!CPUP_DTIME, parent));
+	//if (LktrCond) err = -1;
+	if (!err)
+		err = au_reopen_nondir(file);
+		//err = -1;
+	dinfo->di_hdentry[0 + bstart].hd_dentry = hidden_dentry_bstart;
+	dinfo->di_hdentry[0 + bdst].hd_dentry = hidden_dentry_bdst;
+	dinfo->di_bstart = bstart;
+	if (unlikely(err))
+		goto out_tmp;
+
+	DEBUG_ON(!d_unhashed(dentry));
+	err = vfsub_unlink(hidden_dir, tmp_dentry, lkup.dlgt);
+	//if (LktrCond) err = -1;
+	if (unlikely(err)) {
+		IOErr("failed remove copied-up tmp file %.*s(%d)\n",
+		      DLNPair(tmp_dentry), err);
+		err = -EIO;
+	}
+	dtime_revert(&dt, !CPUP_LOCKED_GHDIR);
+
+ out_tmp:
+	dput(tmp_dentry);
+ out:
+	TraceErr(err);
+	return err;
+}
+
+struct cpup_wh_file_args {
+	int *errp;
+	struct file *file;
+	aufs_bindex_t bdst;
+	loff_t len;
+};
+
+static void call_cpup_wh_file(void *args)
+{
+	struct cpup_wh_file_args *a = args;
+	*a->errp = cpup_wh_file(a->file, a->bdst, a->len);
+}
+
+/*
+ * prepare the @file for writing.
+ */
+int au_ready_to_write(struct file *file, loff_t len)
+{
+	int err;
+	struct dentry *dentry, *parent, *hidden_dentry, *hidden_parent;
+	struct inode *hidden_inode, *hidden_dir, *inode, *dir;
+	struct super_block *sb;
+	aufs_bindex_t bstart, bcpup;
+
+	dentry = file->f_dentry;
+	LKTRTrace("%.*s, len %Ld\n", DLNPair(dentry), len);
+	FiMustWriteLock(file);
+
+	sb = dentry->d_sb;
+	bstart = fbstart(file);
+	DEBUG_ON(ftobr(file, bstart) != stobr(sb, bstart));
+
+	inode = dentry->d_inode;
+	ii_read_lock_child(inode);
+	LKTRTrace("rdonly %d, bstart %d\n", test_ro(sb, bstart, inode), bstart);
+	err = test_ro(sb, bstart, inode);
+	ii_read_unlock(inode);
+	if (!err && (au_h_fptr(file)->f_mode & FMODE_WRITE))
+		return 0;
+
+	/* need to cpup */
+	parent = dentry->d_parent; // dget_parent()
+	di_write_lock_child(dentry);
+	di_write_lock_parent(parent);
+	bcpup = err = find_rw_parent_br(dentry, bstart);
+	//bcpup = err = find_rw_br(sb, bstart);
+	if (unlikely(err < 0))
+		goto out_unlock;
+	err = 0;
+
+	hidden_parent = au_h_dptr_i(parent, bcpup);
+	if (!hidden_parent) {
+		err = cpup_dirs(dentry, bcpup, NULL);
+		//if (LktrCond) err = -1;
+		if (unlikely(err))
+			goto out_unlock;
+		hidden_parent = au_h_dptr_i(parent, bcpup);
+	}
+
+	hidden_dir = hidden_parent->d_inode;
+	hidden_dentry = au_h_fptr(file)->f_dentry;
+	hidden_inode = hidden_dentry->d_inode;
+	dir = parent->d_inode;
+	hdir_lock(hidden_dir, dir, bcpup);
+	hi_lock_child(hidden_inode);
+	if (d_unhashed(dentry) || d_unhashed(hidden_dentry)
+	    /* || !hidden_inode->i_nlink */) {
+		if (!au_test_perm(hidden_dir, MAY_EXEC | MAY_WRITE,
+				  need_dlgt(sb)))
+			err = cpup_wh_file(file, bcpup, len);
+		else {
+			struct cpup_wh_file_args args = {
+				.errp	= &err,
+				.file	= file,
+				.bdst	= bcpup,
+				.len	= len
+			};
+			au_wkq_wait(call_cpup_wh_file, &args, /*dlgt*/0);
+		}
+		//if (LktrCond) err = -1;
+		TraceErr(err);
+	} else {
+		if (!au_h_dptr_i(dentry, bcpup))
+			err = sio_cpup_simple(dentry, bcpup, len,
+					      au_flags_cpup(CPUP_DTIME,
+							    parent));
+		//if (LktrCond) err = -1;
+		TraceErr(err);
+		if (!err)
+			err = au_reopen_nondir(file);
+		//if (LktrCond) err = -1;
+		TraceErr(err);
+	}
+	i_unlock(hidden_inode);
+	hdir_unlock(hidden_dir, dir, bcpup);
+
+ out_unlock:
+	di_write_unlock(parent);
+	di_write_unlock(dentry);
+// out:
+	TraceErr(err);
+	return err;
+
+}
+
+/* ---------------------------------------------------------------------- */
+
+/*
+ * after branch manipulating, refresh the file.
+ */
+static int refresh_file(struct file *file, int (*reopen)(struct file *file))
+{
+	int err, new_sz;
+	struct dentry *dentry;
+	aufs_bindex_t bend, bindex, bstart, brid;
+	struct aufs_hfile *p;
+	struct aufs_finfo *finfo;
+	struct super_block *sb;
+	struct inode *inode;
+	struct file *hidden_file;
+
+	dentry = file->f_dentry;
+	LKTRTrace("%.*s\n", DLNPair(dentry));
+	FiMustWriteLock(file);
+	DiMustReadLock(dentry);
+	inode = dentry->d_inode;
+	IiMustReadLock(inode);
+	//au_debug_on();
+	//DbgDentry(dentry);
+	//DbgFile(file);
+	//au_debug_off();
+
+	err = -ENOMEM;
+	sb = dentry->d_sb;
+	finfo = ftofi(file);
+	bstart = finfo->fi_bstart;
+	bend = finfo->fi_bstart;
+	new_sz = sizeof(*finfo->fi_hfile) * (sbend(sb) + 1);
+	p = au_kzrealloc(finfo->fi_hfile, sizeof(*p) * (finfo->fi_bend + 1),
+			 new_sz, GFP_KERNEL);
+	//p = NULL;
+	if (unlikely(!p))
+		goto out;
+	finfo->fi_hfile = p;
+	hidden_file = p[0 + bstart].hf_file;
+
+	p = finfo->fi_hfile + finfo->fi_bstart;
+	brid = p->hf_br->br_id;
+	bend = finfo->fi_bend;
+	for (bindex = finfo->fi_bstart; bindex <= bend; bindex++, p++) {
+		struct aufs_hfile tmp, *q;
+		aufs_bindex_t new_bindex;
+
+		if (!p->hf_file)
+			continue;
+		new_bindex = find_bindex(sb, p->hf_br);
+		if (new_bindex == bindex)
+			continue;
+		if (new_bindex < 0) { // test here
+			set_h_fptr(file, bindex, NULL);
+			continue;
+		}
+
+		/* swap two hidden inode, and loop again */
+		q = finfo->fi_hfile + new_bindex;
+		tmp = *q;
+		*q = *p;
+		*p = tmp;
+		if (tmp.hf_file) {
+			bindex--;
+			p--;
+		}
+	}
+	{
+		aufs_bindex_t s = finfo->fi_bstart, e = finfo->fi_bend;
+		finfo->fi_bstart = 0;
+		finfo->fi_bend = sbend(sb);
+		//au_debug_on();
+		//DbgFile(file);
+		//au_debug_off();
+		finfo->fi_bstart = s;
+		finfo->fi_bend = e;
+	}
+
+	p = finfo->fi_hfile;
+	if (!au_is_mmapped(file) && !d_unhashed(dentry)) {
+		bend = sbend(sb);
+		for (finfo->fi_bstart = 0; finfo->fi_bstart <= bend;
+		     finfo->fi_bstart++, p++)
+			if (p->hf_file) {
+				if (p->hf_file->f_dentry
+				    && p->hf_file->f_dentry->d_inode)
+					break;
+				else
+					au_hfput(p);
+			}
+	} else {
+		bend = find_brindex(sb, brid);
+		//LKTRTrace("%d\n", bend);
+		for (finfo->fi_bstart = 0; finfo->fi_bstart < bend;
+		     finfo->fi_bstart++, p++)
+			if (p->hf_file)
+				au_hfput(p);
+		//LKTRTrace("%d\n", finfo->fi_bstart);
+		bend = sbend(sb);
+	}
+
+	p = finfo->fi_hfile + bend;
+	for (finfo->fi_bend = bend; finfo->fi_bend >= finfo->fi_bstart;
+	     finfo->fi_bend--, p--)
+		if (p->hf_file) {
+			if (p->hf_file->f_dentry
+			    && p->hf_file->f_dentry->d_inode)
+				break;
+			else
+				au_hfput(p);
+		}
+	//Dbg("%d, %d\n", finfo->fi_bstart, finfo->fi_bend);
+	DEBUG_ON(finfo->fi_bend < finfo->fi_bstart);
+	//DbgFile(file);
+	//DbgDentry(file->f_dentry);
+
+	err = 0;
+#if 0 // todo:
+	if (!au_h_dptr(dentry)->d_inode) {
+		au_update_figen(file);
+		goto out; /* success */
+	}
+#endif
+
+	if (unlikely(au_is_mmapped(file) || d_unhashed(dentry)))
+		goto out_update; /* success */
+
+ again:
+	bstart = ibstart(inode);
+	if (bstart < finfo->fi_bstart
+	    && au_flag_test(sb, AuFlag_PLINK)
+	    && au_is_plinked(sb, inode)) {
+		struct dentry *parent = dentry->d_parent; // dget_parent()
+		struct inode *dir = parent->d_inode, *h_dir;
+
+		if (test_ro(sb, bstart, inode)) {
+			di_read_lock_parent(parent, !AUFS_I_RLOCK);
+			bstart = err = find_rw_parent_br(dentry, bstart);
+			//bstart = err = find_rw_br(sb, bstart);
+			di_read_unlock(parent, !AUFS_I_RLOCK);
+			//todo: err = -1;
+			if (unlikely(err < 0))
+				goto out;
+		}
+		di_read_unlock(dentry, AUFS_I_RLOCK);
+		di_write_lock_child(dentry);
+		if (bstart != ibstart(inode)) { // todo
+			/* someone changed our inode while we were sleeping */
+			di_downgrade_lock(dentry, AUFS_I_RLOCK);
+			goto again;
+		}
+
+		di_read_lock_parent(parent, AUFS_I_RLOCK);
+		err = test_and_cpup_dirs(dentry, bstart, NULL);
+
+		// always superio.
+#if 1
+		h_dir = au_h_dptr_i(parent, bstart)->d_inode;
+		hdir_lock(h_dir, dir, bstart);
+		err = sio_cpup_simple(dentry, bstart, -1,
+				      au_flags_cpup(CPUP_DTIME, parent));
+		hdir_unlock(h_dir, dir, bstart);
+		di_read_unlock(parent, AUFS_I_RLOCK);
+#else
+		if (!is_au_wkq(current)) {
+			struct cpup_pseudo_link_args args = {
+				.errp		= &err,
+				.dentry		= dentry,
+				.bdst		= bstart,
+				.do_lock	= 1
+			};
+			au_wkq_wait(call_cpup_pseudo_link, &args);
+		} else
+			err = cpup_pseudo_link(dentry, bstart, /*do_lock*/1);
+#endif
+		di_downgrade_lock(dentry, AUFS_I_RLOCK);
+		if (unlikely(err))
+			goto out;
+	}
+
+	err = reopen(file);
+	//err = -1;
+ out_update:
+	if (!err) {
+		au_update_figen(file);
+		//DbgFile(file);
+		return 0; /* success */
+	}
+
+	/* error, close all hidden files */
+	bend = fbend(file);
+	for (bindex = fbstart(file); bindex <= bend; bindex++)
+		set_h_fptr(file, bindex, NULL);
+
+ out:
+	TraceErr(err);
+	return err;
+}
+
+/* common function to regular file and dir */
+int au_reval_and_lock_finfo(struct file *file, int (*reopen)(struct file *file),
+			    int wlock, int locked)
+{
+	int err, sgen, fgen, pseudo_link;
+	struct dentry *dentry;
+	struct super_block *sb;
+	aufs_bindex_t bstart;
+
+	dentry = file->f_dentry;
+	LKTRTrace("%.*s, w %d, l %d\n", DLNPair(dentry), wlock, locked);
+	sb = dentry->d_sb;
+	SiMustAnyLock(sb);
+
+	err = 0;
+	sgen = au_sigen(sb);
+	fi_write_lock(file);
+	fgen = au_figen(file);
+	di_read_lock_child(dentry, AUFS_I_RLOCK);
+	bstart = dbstart(dentry);
+	pseudo_link = (bstart != ibstart(dentry->d_inode));
+	di_read_unlock(dentry, AUFS_I_RLOCK);
+	if (sgen == fgen && !pseudo_link && fbstart(file) == bstart) {
+		if (!wlock)
+			fi_downgrade_lock(file);
+		return 0; /* success */
+	}
+
+	LKTRTrace("sgen %d, fgen %d\n", sgen, fgen);
+	if (sgen != au_digen(dentry)) {
+		/*
+		 * d_path() and path_lookup() is a simple and good approach
+		 * to revalidate. but si_rwsem in DEBUG_RWSEM will cause a
+		 * deadlock. removed the code.
+		 */
+		di_write_lock_child(dentry);
+		err = au_reval_dpath(dentry, sgen);
+		//if (LktrCond) err = -1;
+		di_write_unlock(dentry);
+		if (unlikely(err < 0))
+			goto out;
+		DEBUG_ON(au_digen(dentry) != sgen);
+	}
+
+	di_read_lock_child(dentry, AUFS_I_RLOCK);
+	err = refresh_file(file, reopen);
+	//if (LktrCond) err = -1;
+	di_read_unlock(dentry, AUFS_I_RLOCK);
+	if (!err) {
+		if (!wlock)
+			fi_downgrade_lock(file);
+	} else
+		fi_write_unlock(file);
+
+ out:
+	TraceErr(err);
+	return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+// cf. aufs_nopage()
+// for madvise(2)
+static int aufs_readpage(struct file *file, struct page *page)
+{
+	TraceEnter();
+	unlock_page(page);
+	return 0;
+}
+
+// they will never be called.
+#ifdef CONFIG_AUFS_DEBUG
+static int aufs_prepare_write(struct file *file, struct page *page,
+			      unsigned from, unsigned to)
+{BUG();return 0;}
+static int aufs_commit_write(struct file *file, struct page *page,
+			     unsigned from, unsigned to)
+{BUG();return 0;}
+static int aufs_writepage(struct page *page, struct writeback_control *wbc)
+{BUG();return 0;}
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,17)
+static void aufs_sync_page(struct page *page)
+{BUG();}
+#else
+static int aufs_sync_page(struct page *page)
+{BUG(); return 0;}
+#endif
+
+#if 0 // comment
+static int aufs_writepages(struct address_space *mapping,
+			   struct writeback_control *wbc)
+{BUG();return 0;}
+static int aufs_readpages(struct file *filp, struct address_space *mapping,
+			  struct list_head *pages, unsigned nr_pages)
+{BUG();return 0;}
+static sector_t aufs_bmap(struct address_space *mapping, sector_t block)
+{BUG();return 0;}
+#endif
+
+static int aufs_set_page_dirty(struct page *page)
+{BUG();return 0;}
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,17)
+static void aufs_invalidatepage (struct page *page, unsigned long offset)
+{BUG();}
+#else
+static int aufs_invalidatepage (struct page *page, unsigned long offset)
+{BUG(); return 0;}
+#endif
+static int aufs_releasepage (struct page *page, gfp_t gfp)
+{BUG();return 0;}
+static ssize_t aufs_direct_IO(int rw, struct kiocb *iocb,
+			      const struct iovec *iov, loff_t offset,
+			      unsigned long nr_segs)
+{BUG();return 0;}
+static struct page* aufs_get_xip_page(struct address_space *mapping,
+				      sector_t offset, int create)
+{BUG();return NULL;}
+//static int aufs_migratepage (struct page *newpage, struct page *page)
+//{BUG();return 0;}
+#endif
+
+#if 0 // comment
+struct address_space {
+	struct inode		*host;		/* owner: inode, block_device */
+	struct radix_tree_root	page_tree;	/* radix tree of all pages */
+	rwlock_t		tree_lock;	/* and rwlock protecting it */
+	unsigned int		i_mmap_writable;/* count VM_SHARED mappings */
+	struct prio_tree_root	i_mmap;		/* tree of private and shared mappings */
+	struct list_head	i_mmap_nonlinear;/*list VM_NONLINEAR mappings */
+	spinlock_t		i_mmap_lock;	/* protect tree, count, list */
+	unsigned int		truncate_count;	/* Cover race condition with truncate */
+	unsigned long		nrpages;	/* number of total pages */
+	pgoff_t			writeback_index;/* writeback starts here */
+	struct address_space_operations *a_ops;	/* methods */
+	unsigned long		flags;		/* error bits/gfp mask */
+	struct backing_dev_info *backing_dev_info; /* device readahead, etc */
+	spinlock_t		private_lock;	/* for use by the address_space */
+	struct list_head	private_list;	/* ditto */
+	struct address_space	*assoc_mapping;	/* ditto */
+} __attribute__((aligned(sizeof(long))));
+
+struct address_space_operations {
+	int (*writepage)(struct page *page, struct writeback_control *wbc);
+	int (*readpage)(struct file *, struct page *);
+	void (*sync_page)(struct page *);
+
+	/* Write back some dirty pages from this mapping. */
+	int (*writepages)(struct address_space *, struct writeback_control *);
+
+	/* Set a page dirty.  Return true if this dirtied it */
+	int (*set_page_dirty)(struct page *page);
+
+	int (*readpages)(struct file *filp, struct address_space *mapping,
+			struct list_head *pages, unsigned nr_pages);
+
+	/*
+	 * ext3 requires that a successful prepare_write() call be followed
+	 * by a commit_write() call - they must be balanced
+	 */
+	int (*prepare_write)(struct file *, struct page *, unsigned, unsigned);
+	int (*commit_write)(struct file *, struct page *, unsigned, unsigned);
+	/* Unfortunately this kludge is needed for FIBMAP. Don't use it */
+	sector_t (*bmap)(struct address_space *, sector_t);
+	void (*invalidatepage) (struct page *, unsigned long);
+	int (*releasepage) (struct page *, gfp_t);
+	ssize_t (*direct_IO)(int, struct kiocb *, const struct iovec *iov,
+			loff_t offset, unsigned long nr_segs);
+	struct page* (*get_xip_page)(struct address_space *, sector_t,
+			int);
+	/* migrate the contents of a page to the specified target */
+	int (*migratepage) (struct page *, struct page *);
+};
+#endif
+
+struct address_space_operations aufs_aop = {
+	.readpage	= aufs_readpage,
+#ifdef CONFIG_AUFS_DEBUG
+	.writepage	= aufs_writepage,
+	.sync_page	= aufs_sync_page,
+	//.writepages	= aufs_writepages,
+	.set_page_dirty	= aufs_set_page_dirty,
+	//.readpages	= aufs_readpages,
+	.prepare_write	= aufs_prepare_write,
+	.commit_write	= aufs_commit_write,
+	//.bmap		= aufs_bmap,
+	.invalidatepage	= aufs_invalidatepage,
+	.releasepage	= aufs_releasepage,
+	.direct_IO	= aufs_direct_IO,
+	.get_xip_page	= aufs_get_xip_page,
+	//.migratepage	= aufs_migratepage
+#endif
+};
diff --git a/fs/aufs/file.h b/fs/aufs/file.h
new file mode 100755
index 0000000..f0fa448
--- /dev/null
+++ b/fs/aufs/file.h
@@ -0,0 +1,140 @@
+/*
+ * Copyright (C) 2005, 2006, 2007 Junjiro Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+/* $Id: file.h,v 1.25 2007/05/14 03:41:52 sfjro Exp $ */
+
+#ifndef __AUFS_FILE_H__
+#define __AUFS_FILE_H__
+
+#ifdef __KERNEL__
+
+#include <linux/file.h>
+#include <linux/fs.h>
+#include <linux/version.h>
+#include <linux/aufs_type.h>
+#include "misc.h"
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,18)
+// SEEK_xxx are defined in linux/fs.h
+#else
+enum {SEEK_SET, SEEK_CUR, SEEK_END};
+#endif
+
+/* ---------------------------------------------------------------------- */
+
+struct aufs_branch;
+struct aufs_hfile {
+	struct file		*hf_file;
+	struct aufs_branch	*hf_br;
+};
+
+struct aufs_vdir;
+struct aufs_finfo {
+	atomic_t			fi_generation;
+
+	struct aufs_rwsem		fi_rwsem;
+	struct aufs_hfile		*fi_hfile;
+	aufs_bindex_t			fi_bstart, fi_bend;
+
+	union {
+		struct vm_operations_struct	*fi_h_vm_ops;
+		struct aufs_vdir		*fi_vdir_cache;
+	};
+};
+
+/* ---------------------------------------------------------------------- */
+
+/* file.c */
+extern struct address_space_operations aufs_aop;
+unsigned int au_file_roflags(unsigned int flags);
+struct file *hidden_open(struct dentry *dentry, aufs_bindex_t bindex,
+			 int flags);
+int au_do_open(struct inode *inode, struct file *file,
+	       int (*open)(struct file *file, int flags));
+int au_reopen_nondir(struct file *file);
+int au_ready_to_write(struct file *file, loff_t len);
+int au_reval_and_lock_finfo(struct file *file, int (*reopen)(struct file *file),
+			    int wlock, int locked);
+
+/* f_op.c */
+extern struct file_operations aufs_file_fop;
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,18)
+int aufs_flush(struct file *file, fl_owner_t id);
+#else
+int aufs_flush(struct file *file);
+#endif
+
+/* finfo.c */
+struct aufs_finfo *ftofi(struct file *file);
+aufs_bindex_t fbstart(struct file *file);
+aufs_bindex_t fbend(struct file *file);
+struct aufs_vdir *fvdir_cache(struct file *file);
+struct aufs_branch *ftobr(struct file *file, aufs_bindex_t bindex);
+struct file *au_h_fptr_i(struct file *file, aufs_bindex_t bindex);
+struct file *au_h_fptr(struct file *file);
+
+void set_fbstart(struct file *file, aufs_bindex_t bindex);
+void set_fbend(struct file *file, aufs_bindex_t bindex);
+void set_fvdir_cache(struct file *file, struct aufs_vdir *vdir_cache);
+void au_hfput(struct aufs_hfile *hf);
+void set_h_fptr(struct file *file, aufs_bindex_t bindex, struct file *h_file);
+void au_update_figen(struct file *file);
+
+void au_fin_finfo(struct file *file);
+int au_init_finfo(struct file *file);
+
+/* ---------------------------------------------------------------------- */
+
+static inline int au_figen(struct file *f)
+{
+	return atomic_read(&ftofi(f)->fi_generation);
+}
+
+static inline int au_is_mmapped(struct file *f)
+{
+	return !!(ftofi(f)->fi_h_vm_ops);
+}
+
+/* ---------------------------------------------------------------------- */
+
+/*
+ * fi_read_lock, fi_write_lock,
+ * fi_read_unlock, fi_write_unlock, fi_downgrade_lock
+ */
+SimpleRwsemFuncs(fi, struct file *f, ftofi(f)->fi_rwsem);
+
+/* to debug easier, do not make them inlined functions */
+#define FiMustReadLock(f) do {\
+	SiMustAnyLock((f)->f_dentry->d_sb); \
+	RwMustReadLock(&ftofi(f)->fi_rwsem); \
+} while (0)
+
+#define FiMustWriteLock(f) do { \
+	SiMustAnyLock((f)->f_dentry->d_sb); \
+	RwMustWriteLock(&ftofi(f)->fi_rwsem); \
+} while (0)
+
+#define FiMustAnyLock(f) do { \
+	SiMustAnyLock((f)->f_dentry->d_sb); \
+	RwMustAnyLock(&ftofi(f)->fi_rwsem); \
+} while (0)
+
+#define FiMustNoWaiters(f)	RwMustNoWaiters(&ftofi(f)->fi_rwsem)
+
+#endif /* __KERNEL__ */
+#endif /* __AUFS_FILE_H__ */
diff --git a/fs/aufs/finfo.c b/fs/aufs/finfo.c
new file mode 100755
index 0000000..1e09da8
--- /dev/null
+++ b/fs/aufs/finfo.c
@@ -0,0 +1,211 @@
+/*
+ * Copyright (C) 2005, 2006, 2007 Junjiro Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+/* $Id: finfo.c,v 1.23 2007/04/30 05:45:21 sfjro Exp $ */
+
+#include "aufs.h"
+
+struct aufs_finfo *ftofi(struct file *file)
+{
+	struct aufs_finfo *finfo = file->private_data;
+	DEBUG_ON(!finfo
+		 || !finfo->fi_hfile
+		 || (0 < finfo->fi_bend
+		     && (/* stosi(file->f_dentry->d_sb)->si_bend
+			    < finfo->fi_bend
+			    || */ finfo->fi_bend < finfo->fi_bstart)));
+	return finfo;
+}
+
+// hard/soft set
+aufs_bindex_t fbstart(struct file *file)
+{
+	FiMustAnyLock(file);
+	return ftofi(file)->fi_bstart;
+}
+
+aufs_bindex_t fbend(struct file *file)
+{
+	FiMustAnyLock(file);
+	return ftofi(file)->fi_bend;
+}
+
+struct aufs_vdir *fvdir_cache(struct file *file)
+{
+	FiMustAnyLock(file);
+	return ftofi(file)->fi_vdir_cache;
+}
+
+struct aufs_branch *ftobr(struct file *file, aufs_bindex_t bindex)
+{
+	struct aufs_finfo *finfo = ftofi(file);
+	struct aufs_hfile *hf;
+
+	FiMustAnyLock(file);
+	DEBUG_ON(!finfo
+		 || finfo->fi_bstart < 0
+		 || bindex < finfo->fi_bstart
+		 || finfo->fi_bend < bindex);
+	hf = finfo->fi_hfile + bindex;
+	DEBUG_ON(hf->hf_br && br_count(hf->hf_br) <= 0);
+	return hf->hf_br;
+}
+
+struct file *au_h_fptr_i(struct file *file, aufs_bindex_t bindex)
+{
+	struct aufs_finfo *finfo = ftofi(file);
+	struct aufs_hfile *hf;
+
+	FiMustAnyLock(file);
+	DEBUG_ON(!finfo
+		 || finfo->fi_bstart < 0
+		 || bindex < finfo->fi_bstart
+		 || finfo->fi_bend < bindex);
+	hf = finfo->fi_hfile + bindex;
+	DEBUG_ON(hf->hf_file
+		 && file_count(hf->hf_file) <= 0
+		 && br_count(hf->hf_br) <= 0);
+	return hf->hf_file;
+}
+
+struct file *au_h_fptr(struct file *file)
+{
+	return au_h_fptr_i(file, fbstart(file));
+}
+
+void set_fbstart(struct file *file, aufs_bindex_t bindex)
+{
+	FiMustWriteLock(file);
+	DEBUG_ON(sbend(file->f_dentry->d_sb) < bindex);
+	ftofi(file)->fi_bstart = bindex;
+}
+
+void set_fbend(struct file *file, aufs_bindex_t bindex)
+{
+	FiMustWriteLock(file);
+	DEBUG_ON(sbend(file->f_dentry->d_sb) < bindex
+		 || bindex < fbstart(file));
+	ftofi(file)->fi_bend = bindex;
+}
+
+void set_fvdir_cache(struct file *file, struct aufs_vdir *vdir_cache)
+{
+	FiMustWriteLock(file);
+	DEBUG_ON(!S_ISDIR(file->f_dentry->d_inode->i_mode)
+		 || (ftofi(file)->fi_vdir_cache && vdir_cache));
+	ftofi(file)->fi_vdir_cache = vdir_cache;
+}
+
+void au_hfput(struct aufs_hfile *hf)
+{
+	fput(hf->hf_file);
+	hf->hf_file = NULL;
+	DEBUG_ON(!hf->hf_br);
+	br_put(hf->hf_br);
+	hf->hf_br = NULL;
+}
+
+void set_h_fptr(struct file *file, aufs_bindex_t bindex, struct file *val)
+{
+	struct aufs_finfo *finfo = ftofi(file);
+	struct aufs_hfile *hf;
+
+	FiMustWriteLock(file);
+	DEBUG_ON(!finfo
+		 || finfo->fi_bstart < 0
+		 || bindex < finfo->fi_bstart
+		 || finfo->fi_bend < bindex);
+	DEBUG_ON(val && file_count(val) <= 0);
+	hf = finfo->fi_hfile + bindex;
+	DEBUG_ON(val && hf->hf_file);
+	if (hf->hf_file)
+		au_hfput(hf);
+	if (val) {
+		hf->hf_file = val;
+		hf->hf_br = stobr(file->f_dentry->d_sb, bindex);
+	}
+}
+
+void au_update_figen(struct file *file)
+{
+	atomic_set(&ftofi(file)->fi_generation, au_digen(file->f_dentry));
+}
+
+void au_fin_finfo(struct file *file)
+{
+	struct aufs_finfo *finfo;
+	struct dentry *dentry;
+	aufs_bindex_t bindex, bend;
+
+	dentry = file->f_dentry;
+	LKTRTrace("%.*s\n", DLNPair(dentry));
+	SiMustAnyLock(dentry->d_sb);
+
+	fi_write_lock(file);
+	bend = fbend(file);
+	bindex = fbstart(file);
+	if (bindex >= 0)
+		for (; bindex <= bend; bindex++)
+			set_h_fptr(file, bindex, NULL);
+
+	finfo = ftofi(file);
+#ifdef CONFIG_AUFS_DEBUG
+	if (finfo->fi_bstart >= 0) {
+		bend = fbend(file);
+		for (bindex = finfo->fi_bstart; bindex <= bend; bindex++) {
+			struct aufs_hfile *hf;
+			hf = finfo->fi_hfile + bindex;
+			DEBUG_ON(hf->hf_file || hf->hf_br);
+		}
+	}
+#endif
+
+	kfree(finfo->fi_hfile);
+	fi_write_unlock(file);
+	cache_free_finfo(finfo);
+	//file->private_data = NULL;
+}
+
+int au_init_finfo(struct file *file)
+{
+	struct aufs_finfo *finfo;
+	struct dentry *dentry;
+
+	dentry = file->f_dentry;
+	LKTRTrace("%.*s\n", DLNPair(dentry));
+	DEBUG_ON(!dentry->d_inode);
+
+	finfo = cache_alloc_finfo();
+	if (finfo) {
+		finfo->fi_hfile = kcalloc(sbend(dentry->d_sb) + 1,
+					  sizeof(*finfo->fi_hfile), GFP_KERNEL);
+		if (finfo->fi_hfile) {
+			rw_init_wlock(&finfo->fi_rwsem);
+			finfo->fi_bstart = -1;
+			finfo->fi_bend = -1;
+			atomic_set(&finfo->fi_generation, au_digen(dentry));
+
+			file->private_data = finfo;
+			return 0; /* success */
+		}
+		cache_free_finfo(finfo);
+	}
+
+	TraceErr(-ENOMEM);
+	return -ENOMEM;
+}
diff --git a/fs/aufs/hinotify.c b/fs/aufs/hinotify.c
new file mode 100755
index 0000000..3bad3f7
--- /dev/null
+++ b/fs/aufs/hinotify.c
@@ -0,0 +1,536 @@
+/*
+ * Copyright (C) 2005, 2006, 2007 Junjiro Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+/* $Id: hinotify.c,v 1.19 2007/05/14 03:39:21 sfjro Exp $ */
+
+#include "aufs.h"
+
+static struct inotify_handle *in_handle;
+static const __u32 in_mask = (IN_MOVE | IN_DELETE | IN_CREATE /* | IN_ACCESS */
+			      | IN_MODIFY | IN_ATTRIB
+			      | IN_DELETE_SELF | IN_MOVE_SELF);
+
+int alloc_hinotify(struct aufs_hinode *hinode, struct inode *inode,
+		   struct inode *hidden_inode)
+{
+	int err;
+	struct aufs_hinotify *hin;
+	s32 wd;
+
+	LKTRTrace("i%lu, hi%lu\n", inode->i_ino, hidden_inode->i_ino);
+
+	err = -ENOMEM;
+	hin = cache_alloc_hinotify();
+	if (hin) {
+		DEBUG_ON(hinode->hi_notify);
+		hinode->hi_notify = hin;
+		hin->hin_aufs_inode = inode;
+		inotify_init_watch(&hin->hin_watch);
+		wd = inotify_add_watch(in_handle, &hin->hin_watch, hidden_inode,
+				       in_mask);
+		if (wd >= 0)
+			return 0; /* success */
+
+		err = wd;
+		put_inotify_watch(&hin->hin_watch);
+		cache_free_hinotify(hin);
+		hinode->hi_notify = NULL;
+	}
+
+	TraceErr(err);
+	return err;
+}
+
+void do_free_hinotify(struct aufs_hinode *hinode)
+{
+	int err;
+	struct aufs_hinotify *hin;
+
+	TraceEnter();
+
+	hin = hinode->hi_notify;
+	if (hin) {
+		err = 0;
+		if (atomic_read(&hin->hin_watch.count))
+			err = inotify_rm_watch(in_handle, &hin->hin_watch);
+
+		if (!err) {
+			cache_free_hinotify(hin);
+			hinode->hi_notify = NULL;
+		} else
+			IOErr1("failed inotify_rm_watch() %d\n", err);
+	}
+}
+
+/* ---------------------------------------------------------------------- */
+
+static void ctl_hinotify(struct aufs_hinode *hinode, const __u32 mask)
+{
+	struct inode *hi;
+	struct inotify_watch *watch;
+
+	hi = hinode->hi_inode;
+	LKTRTrace("hi%lu, sb %p, 0x%x\n", hi->i_ino, hi->i_sb, mask);
+	if (0 && !strcmp(current->comm, "link"))
+		dump_stack();
+	IMustLock(hi);
+	if (!hinode->hi_notify)
+		return;
+
+	watch = &hinode->hi_notify->hin_watch;
+#if 0
+	{
+		u32 wd;
+		wd = inotify_find_update_watch(in_handle, hi, mask);
+		TraceErr(wd);
+		// ignore an err;
+	}
+#else
+	watch->mask = mask;
+	smp_mb();
+#endif
+	LKTRTrace("watch %p, mask %u\n", watch, watch->mask);
+}
+
+#define suspend_hinotify(hi)	ctl_hinotify(hi, 0)
+#define resume_hinotify(hi)	ctl_hinotify(hi, in_mask)
+
+void do_hdir_lock(struct inode *h_dir, struct inode *dir, aufs_bindex_t bindex,
+		  unsigned int lsc)
+{
+	struct aufs_hinode *hinode;
+
+	LKTRTrace("i%lu, b%d, lsc %d\n", dir->i_ino, bindex, lsc);
+	DEBUG_ON(!S_ISDIR(dir->i_mode));
+	hinode = itoii(dir)->ii_hinode + bindex;
+	DEBUG_ON(h_dir != hinode->hi_inode);
+
+	hi_lock(h_dir, lsc);
+	if (1 /* unlikely(au_flag_test(dir->i_sb, AuFlag_UDBA_HINOTIFY) */)
+		suspend_hinotify(hinode);
+}
+
+void hdir_unlock(struct inode *h_dir, struct inode *dir, aufs_bindex_t bindex)
+{
+	struct aufs_hinode *hinode;
+
+	LKTRTrace("i%lu, b%d\n", dir->i_ino, bindex);
+	DEBUG_ON(!S_ISDIR(dir->i_mode));
+	hinode = itoii(dir)->ii_hinode + bindex;
+	DEBUG_ON(h_dir != hinode->hi_inode);
+
+	if (1 /* unlikely(au_flag_test(dir->i_sb, AuFlag_UDBA_HINOTIFY) */)
+	    resume_hinotify(hinode);
+	i_unlock(h_dir);
+}
+
+void hdir_lock_rename(struct dentry **h_parents, struct inode **dirs,
+		      aufs_bindex_t bindex, int issamedir)
+{
+	struct aufs_hinode *hinode;
+
+	LKTRTrace("%.*s, %.*s\n", DLNPair(h_parents[0]), DLNPair(h_parents[1]));
+
+	vfsub_lock_rename(h_parents[0], h_parents[1]);
+	hinode = itoii(dirs[0])->ii_hinode + bindex;
+	DEBUG_ON(h_parents[0]->d_inode != hinode->hi_inode);
+	suspend_hinotify(hinode);
+	if (issamedir)
+		return;
+	hinode = itoii(dirs[1])->ii_hinode + bindex;
+	DEBUG_ON(h_parents[1]->d_inode != hinode->hi_inode);
+	suspend_hinotify(hinode);
+}
+
+void hdir_unlock_rename(struct dentry **h_parents, struct inode **dirs,
+			aufs_bindex_t bindex, int issamedir)
+{
+	struct aufs_hinode *hinode;
+
+	LKTRTrace("%.*s, %.*s\n", DLNPair(h_parents[0]), DLNPair(h_parents[1]));
+
+	hinode = itoii(dirs[0])->ii_hinode + bindex;
+	DEBUG_ON(h_parents[0]->d_inode != hinode->hi_inode);
+	resume_hinotify(hinode);
+	if (!issamedir) {
+		hinode = itoii(dirs[1])->ii_hinode + bindex;
+		DEBUG_ON(h_parents[1]->d_inode != hinode->hi_inode);
+		resume_hinotify(hinode);
+	}
+	vfsub_unlock_rename(h_parents[0], h_parents[1]);
+}
+
+void au_reset_hinotify(struct inode *inode, unsigned int flags)
+{
+	aufs_bindex_t bindex, bend;
+	struct inode *hi;
+
+	LKTRTrace("i%lu, 0x%x\n", inode->i_ino, flags);
+
+	bend = ibend(inode);
+	for (bindex = ibstart(inode); bindex <= bend; bindex++) {
+		hi = au_h_iptr_i(inode, bindex);
+		if (hi) {
+			//hi_lock(hi, AUFS_LSC_H_CHILD);
+			igrab(hi);
+			set_h_iptr(inode, bindex, NULL, 0);
+			set_h_iptr(inode, bindex, igrab(hi), flags);
+			iput(hi);
+			//i_unlock(hi);
+		}
+	}
+}
+
+/* ---------------------------------------------------------------------- */
+
+#ifdef CONFIG_AUFS_DEBUG
+static char *in_name(u32 mask)
+{
+#define test_ret(flag)	if (mask & flag) return #flag;
+	test_ret(IN_ACCESS);
+	test_ret(IN_MODIFY);
+	test_ret(IN_ATTRIB);
+	test_ret(IN_CLOSE_WRITE);
+	test_ret(IN_CLOSE_NOWRITE);
+	test_ret(IN_OPEN);
+	test_ret(IN_MOVED_FROM);
+	test_ret(IN_MOVED_TO);
+	test_ret(IN_CREATE);
+	test_ret(IN_DELETE);
+	test_ret(IN_DELETE_SELF);
+	test_ret(IN_MOVE_SELF);
+	test_ret(IN_UNMOUNT);
+	test_ret(IN_Q_OVERFLOW);
+	test_ret(IN_IGNORED);
+	return "";
+#undef test_ret
+}
+#else
+#define in_name(m) "??"
+#endif
+
+static int dec_gen_by_name(struct inode *dir, const char *_name, u32 mask)
+{
+	int err;
+	struct dentry *parent, *child;
+	struct inode *inode;
+	struct qstr *dname;
+	char *name = (void*)_name;
+	unsigned int len;
+
+	LKTRTrace("i%lu, %s, 0x%x %s\n",
+		  dir->i_ino, name, mask, in_name(mask));
+
+	err = -1;
+	parent = d_find_alias(dir);
+	if (unlikely(!parent))
+		goto out;
+
+#if 0
+	if (unlikely(!memcmp(name, AUFS_WH_PFX, AUFS_WH_PFX_LEN)))
+		name += AUFS_WH_PFX_LEN;
+#endif
+	len = strlen(name);
+	spin_lock(&dcache_lock);
+	list_for_each_entry(child, &parent->d_subdirs, d_u.d_child) {
+		dname = &child->d_name;
+		if (len == dname->len && !memcmp(dname->name, name, len)) {
+			au_digen_dec(child);
+#if 1
+			//todo: why both are needed
+			if (mask & IN_MOVE) {
+				spin_lock(&child->d_lock);
+				__d_drop(child);
+				spin_unlock(&child->d_lock);
+			}
+#endif
+
+			inode = child->d_inode;
+			if (inode)
+				au_iigen_dec(inode);
+			err = !!inode;
+
+			// todo: the i_nlink of newly created name by link(2)
+			// should be updated
+			// todo: some nfs dentry doesn't notified at deleteing
+			break;
+		}
+	}
+	spin_unlock(&dcache_lock);
+	dput(parent);
+
+ out:
+	TraceErr(err);
+	return err;
+}
+
+struct postproc_args {
+	struct inode *h_dir, *dir, *h_child_inode;
+	char *h_child_name;
+	u32 mask;
+};
+
+static void dec_gen_by_ino(struct postproc_args *a)
+{
+	struct super_block *sb;
+	aufs_bindex_t bindex, bend, bfound;
+	struct xino xino;
+	struct inode *cinode;
+
+	TraceEnter();
+
+	sb = a->dir->i_sb;
+	DEBUG_ON(!au_flag_test(sb, AuFlag_XINO));
+
+	bfound = -1;
+	bend = ibend(a->dir);
+	for (bindex = ibstart(a->dir); bfound == -1 && bindex <= bend; bindex++)
+		if (au_h_iptr_i(a->dir, bindex) == a->h_dir)
+			bfound = bindex;
+	if (bfound < 0)
+		return;
+
+	bindex = find_brindex(sb, itoii(a->dir)->ii_hinode[bfound + 0].hi_id);
+	if (bindex < 0)
+		return;
+	if (unlikely(xino_read(sb, bindex, a->h_child_inode->i_ino, &xino)))
+		return;
+	cinode = NULL;
+	if (xino.ino)
+		cinode = ilookup(sb, xino.ino);
+	if (cinode) {
+#if 1
+		if (1 || a->mask & IN_MOVE) {
+			struct dentry *child;
+			spin_lock(&dcache_lock);
+			list_for_each_entry(child, &cinode->i_dentry, d_alias)
+				au_digen_dec(child);
+			spin_unlock(&dcache_lock);
+		}
+#endif
+		au_iigen_dec(cinode);
+		iput(cinode);
+	}
+}
+
+static void reset_ino(struct postproc_args *a)
+{
+	aufs_bindex_t bindex, bend;
+	struct super_block *sb;
+	struct inode *h_dir;
+
+	sb = a->dir->i_sb;
+	bend = ibend(a->dir);
+	for (bindex = ibstart(a->dir); bindex <= bend; bindex++) {
+		h_dir = au_h_iptr_i(a->dir, bindex);
+		if (h_dir && h_dir != a->h_dir)
+			xino_write0(sb, bindex, h_dir->i_ino);
+		/* ignore this error */
+	}
+}
+
+static void postproc(void *args)
+{
+	struct postproc_args *a = args;
+	struct super_block *sb;
+	struct aufs_vdir *vdir;
+
+	//au_debug_on();
+	LKTRTrace("mask 0x%x %s, i%lu, hi%lu, hci%lu\n",
+		  a->mask, in_name(a->mask), a->dir->i_ino, a->h_dir->i_ino,
+		  a->h_child_inode ? a->h_child_inode->i_ino : 0);
+	DEBUG_ON(!a->dir);
+#if 0//def ForceInotify
+	Dbg("mask 0x%x %s, i%lu, hi%lu, hci%lu\n",
+		  a->mask, in_name(a->mask), a->dir->i_ino, a->h_dir->i_ino,
+		  a->h_child_inode ? a->h_child_inode->i_ino : 0);
+#endif
+
+	i_lock(a->dir);
+	sb = a->dir->i_sb;
+	si_read_lock(sb); // consider write_lock
+	ii_write_lock_parent(a->dir);
+
+	/* make dir entries obsolete */
+	vdir = ivdir(a->dir);
+	if (vdir)
+		vdir->vd_jiffy = 0;
+	a->dir->i_version++;
+
+	/*
+	 * special handling root directory,
+	 * sine d_revalidate may not be called later.
+	 * main purpose is maintaining i_nlink.
+	 */
+	if (unlikely(a->dir->i_ino == AUFS_ROOT_INO))
+		au_cpup_attr_all(a->dir);
+
+	if (a->h_child_inode && au_flag_test(sb, AuFlag_XINO))
+		dec_gen_by_ino(a);
+	else if (a->mask & (IN_MOVE_SELF | IN_DELETE_SELF))
+		reset_ino(a);
+
+	ii_write_unlock(a->dir);
+	si_read_unlock(sb);
+	i_unlock(a->dir);
+
+	au_mntput(a->dir->i_sb);
+	iput(a->h_child_inode);
+	iput(a->h_dir);
+	iput(a->dir);
+#if 0
+	if (atomic_dec_and_test(&stosi(sb)->si_hinotify))
+		wake_up_all(&stosi(sb)->si_hinotify_wq);
+#endif
+	kfree(a);
+	//au_debug_off();
+}
+
+static void aufs_inotify(struct inotify_watch *watch, u32 wd, u32 mask,
+			 u32 cookie, const char *h_child_name,
+			 struct inode *h_child_inode)
+{
+	struct aufs_hinotify *hinotify;
+	struct postproc_args *args;
+	int len;
+	char *p;
+	struct inode *dir;
+	//static DECLARE_WAIT_QUEUE_HEAD(wq);
+
+	//au_debug_on();
+	LKTRTrace("i%lu, wd %d, mask 0x%x %s, cookie 0x%x, hcname %s, hi%lu\n",
+		  watch->inode->i_ino, wd, mask, in_name(mask), cookie,
+		  h_child_name ? h_child_name : "",
+		  h_child_inode ? h_child_inode->i_ino : 0);
+	//au_debug_off();
+	//IMustLock(h_dir);
+#if 0 //defined(ForceInotify) || defined(DbgInotify)
+	Dbg("i%lu, wd %d, mask 0x%x %s, cookie 0x%x, hcname %s, hi%lu\n",
+		  watch->inode->i_ino, wd, mask, in_name(mask), cookie,
+		  h_child_name ? h_child_name : "",
+		  h_child_inode ? h_child_inode->i_ino : 0);
+#endif
+	/* if IN_UNMOUNT happens, there must be another bug */
+	if (mask & (IN_IGNORED | IN_UNMOUNT)) {
+		put_inotify_watch(watch);
+		return;
+	}
+
+	switch (mask & IN_ALL_EVENTS) {
+	case IN_MODIFY:
+	case IN_ATTRIB:
+		if (h_child_name)
+			return;
+		break;
+
+	case IN_MOVED_FROM:
+	case IN_MOVED_TO:
+	case IN_CREATE:
+		DEBUG_ON(!h_child_name || !h_child_inode);
+		break;
+	case IN_DELETE:
+		/*
+		 * aufs never be able to get this child inode.
+		 * revalidation should be in d_revalide()
+		 * by checking i_nlink, i_generation or d_unhashed().
+		 */
+		DEBUG_ON(!h_child_name);
+		break;
+
+	case IN_DELETE_SELF:
+	case IN_MOVE_SELF:
+		DEBUG_ON(h_child_name || h_child_inode);
+		break;
+
+	case IN_ACCESS:
+	default:
+		DEBUG_ON(1);
+	}
+
+#ifdef DbgInotify
+	WARN_ON(1);
+#endif
+
+	/* iput() will be called in postproc() */
+	hinotify = container_of(watch, struct aufs_hinotify, hin_watch);
+	DEBUG_ON(!hinotify || !hinotify->hin_aufs_inode);
+	dir = hinotify->hin_aufs_inode;
+
+	/* force re-lookup in next d_revalidate() */
+	if (dir->i_ino != AUFS_ROOT_INO)
+		au_iigen_dec(dir);
+	len = 0;
+	if (h_child_name && dec_gen_by_name(dir, h_child_name, mask))
+		len = strlen(h_child_name);
+
+	//wait_event(wq, (args = kmalloc(sizeof(*args), GFP_KERNEL)));
+	args = kmalloc(sizeof(*args) + len + 1, GFP_KERNEL);
+	if (unlikely(!args)) {
+		Err("no memory\n");
+		return;
+	}
+	args->mask = mask;
+	args->dir = igrab(dir);
+	args->h_dir = igrab(watch->inode);
+	args->h_child_inode = NULL;
+	if (len) {
+		if (h_child_inode)
+			args->h_child_inode = igrab(h_child_inode);
+		p = (void*)args;
+		args->h_child_name = p + sizeof(*args);
+		memcpy(args->h_child_name, h_child_name, len + 1);
+	}
+	//atomic_inc(&stosi(args->dir->i_sb)->si_hinotify);
+	/* prohibit umount */
+	au_mntget(args->dir->i_sb);
+	au_wkq_nowait(postproc, args, /*dlgt*/0);
+}
+
+#if 0
+void hinotify_flush(struct super_block *sb)
+{
+	atomic_t *p = &stosi(sb)->si_hinotify;
+	wait_event(stosi(sb)->si_hinotify_wq, !atomic_read(p));
+}
+#endif
+
+static void aufs_inotify_destroy(struct inotify_watch *watch)
+{
+	return;
+}
+
+static struct inotify_operations aufs_inotify_ops = {
+	.handle_event	= aufs_inotify,
+	.destroy_watch	= aufs_inotify_destroy
+};
+
+/* ---------------------------------------------------------------------- */
+
+int __init au_inotify_init(void)
+{
+	in_handle = inotify_init(&aufs_inotify_ops);
+	if (!IS_ERR(in_handle))
+		return 0;
+	TraceErrPtr(in_handle);
+	return PTR_ERR(in_handle);
+}
+
+void au_inotify_fin(void)
+{
+	inotify_destroy(in_handle);
+}
diff --git a/fs/aufs/i_op.c b/fs/aufs/i_op.c
new file mode 100755
index 0000000..1cd0453
--- /dev/null
+++ b/fs/aufs/i_op.c
@@ -0,0 +1,641 @@
+/*
+ * Copyright (C) 2005, 2006, 2007 Junjiro Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+/* $Id: i_op.c,v 1.30 2007/04/23 00:55:05 sfjro Exp $ */
+
+//#include <linux/fs.h>
+//#include <linux/namei.h>
+#include <linux/security.h>
+#include <asm/uaccess.h>
+#include "aufs.h"
+
+#ifdef CONFIG_AUFS_DLGT
+struct security_inode_permission_args {
+	int *errp;
+	struct inode *h_inode;
+	int mask;
+	struct nameidata *fake_nd;
+};
+
+static void call_security_inode_permission(void *args)
+{
+	struct security_inode_permission_args *a = args;
+	LKTRTrace("fsuid %d\n", current->fsuid);
+	*a->errp = security_inode_permission(a->h_inode, a->mask, a->fake_nd);
+}
+#endif
+
+static int hidden_permission(struct inode *hidden_inode, int mask,
+			     struct nameidata *fake_nd, int brperm, int dlgt)
+{
+	int err, submask;
+	const int write_mask = (mask & (MAY_WRITE | MAY_APPEND));
+
+	LKTRTrace("ino %lu, mask 0x%x, brperm 0x%x\n",
+		  hidden_inode->i_ino, mask, brperm);
+
+	err = -EACCES;
+	if (unlikely(write_mask && IS_IMMUTABLE(hidden_inode)))
+		goto out;
+
+	/* skip hidden fs test in the case of write to ro branch */
+	submask = mask & ~MAY_APPEND;
+	if (unlikely((write_mask && !br_writable(brperm))
+		     || !hidden_inode->i_op
+		     || !hidden_inode->i_op->permission)) {
+		//LKTRLabel(generic_permission);
+		err = generic_permission(hidden_inode, submask, NULL);
+	} else {
+		//LKTRLabel(h_inode->permission);
+		err = hidden_inode->i_op->permission(hidden_inode, submask,
+						     fake_nd);
+		TraceErr(err);
+	}
+
+#if 1
+	if (!err) {
+#ifndef CONFIG_AUFS_DLGT
+		err = security_inode_permission(hidden_inode, mask, fake_nd);
+#else
+		if (!dlgt)
+			err = security_inode_permission(hidden_inode, mask,
+							fake_nd);
+		else {
+			struct security_inode_permission_args args = {
+				.errp		= &err,
+				.h_inode	= hidden_inode,
+				.mask		= mask,
+				.fake_nd	= fake_nd
+			};
+			au_wkq_wait(call_security_inode_permission, &args,
+				    /*dlgt*/1);
+		}
+#endif
+	}
+#endif
+
+ out:
+	TraceErr(err);
+	return err;
+}
+
+static int silly_lock(struct inode *inode, struct nameidata *nd)
+{
+	int locked = 0;
+	struct super_block *sb = inode->i_sb;
+
+	LKTRTrace("i%lu, nd %p\n", inode->i_ino, nd);
+
+#ifdef CONFIG_AUFS_FAKE_DM
+	si_read_lock(sb);
+	ii_read_lock_child(inode);
+#else
+	if (!nd || !nd->dentry) {
+		si_read_lock(sb);
+		ii_read_lock_child(inode);
+	} else if (nd->dentry->d_inode != inode) {
+		locked = 1;
+		/* lock child first, then parent */
+		si_read_lock(sb);
+		ii_read_lock_child(inode);
+		di_read_lock_parent(nd->dentry, 0);
+	} else {
+		locked = 2;
+		aufs_read_lock(nd->dentry, AUFS_I_RLOCK);
+	}
+#endif
+	return locked;
+}
+
+static void silly_unlock(int locked, struct inode *inode, struct nameidata *nd)
+{
+	struct super_block *sb = inode->i_sb;
+
+	LKTRTrace("locked %d, i%lu, nd %p\n", locked, inode->i_ino, nd);
+
+#ifdef CONFIG_AUFS_FAKE_DM
+	ii_read_unlock(inode);
+	si_read_unlock(sb);
+#else
+	switch (locked) {
+	case 0:
+		ii_read_unlock(inode);
+		si_read_unlock(sb);
+		break;
+	case 1:
+		di_read_unlock(nd->dentry, 0);
+		ii_read_unlock(inode);
+		si_read_unlock(sb);
+		break;
+	case 2:
+		aufs_read_unlock(nd->dentry, AUFS_I_RLOCK);
+		break;
+	default:
+		BUG();
+	}
+#endif
+}
+
+static int aufs_permission(struct inode *inode, int mask, struct nameidata *nd)
+{
+	int err, locked, dlgt;
+	aufs_bindex_t bindex, bend;
+	struct inode *hidden_inode;
+	struct super_block *sb;
+	struct nameidata fake_nd, *p;
+	const int write_mask = (mask & (MAY_WRITE | MAY_APPEND));
+	const int nondir = !S_ISDIR(inode->i_mode);
+
+	LKTRTrace("ino %lu, mask 0x%x, nondir %d, write_mask %d, "
+		  "nd %p{%p, %p}\n",
+		  inode->i_ino, mask, nondir, write_mask,
+		  nd, nd ? nd->dentry : NULL, nd ? nd->mnt : NULL);
+
+	sb = inode->i_sb;
+	locked = silly_lock(inode, nd);
+	dlgt = need_dlgt(sb);
+
+	if (nd)
+		fake_nd = *nd;
+	if (/* unlikely */(nondir || write_mask)) {
+		hidden_inode = au_h_iptr(inode);
+		DEBUG_ON(!hidden_inode
+			 || ((hidden_inode->i_mode & S_IFMT)
+			     != (inode->i_mode & S_IFMT)));
+		err = 0;
+		bindex = ibstart(inode);
+		p = fake_dm(&fake_nd, nd, sb, bindex);
+		/* actual test will be delegated to LSM */
+		if (IS_ERR(p))
+			DEBUG_ON(PTR_ERR(p) != -ENOENT);
+		else {
+			err = hidden_permission(hidden_inode, mask, p,
+						sbr_perm(sb, bindex), dlgt);
+			fake_dm_release(p);
+		}
+		if (write_mask && !err) {
+			err = find_rw_br(sb, bindex);
+			if (err >= 0)
+				err = 0;
+		}
+		goto out;
+	}
+
+	/* non-write to dir */
+	err = 0;
+	bend = ibend(inode);
+	for (bindex = ibstart(inode); !err && bindex <= bend; bindex++) {
+		hidden_inode = au_h_iptr_i(inode, bindex);
+		if (!hidden_inode)
+			continue;
+		DEBUG_ON(!S_ISDIR(hidden_inode->i_mode));
+
+		p = fake_dm(&fake_nd, nd, sb, bindex);
+		/* actual test will be delegated to LSM */
+		if (IS_ERR(p))
+			DEBUG_ON(PTR_ERR(p) != -ENOENT);
+		else {
+			err = hidden_permission(hidden_inode, mask, p,
+						sbr_perm(sb, bindex), dlgt);
+			fake_dm_release(p);
+		}
+	}
+
+ out:
+	silly_unlock(locked, inode, nd);
+	TraceErr(err);
+	return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+static struct dentry *aufs_lookup(struct inode *dir, struct dentry *dentry,
+				  struct nameidata *nd)
+{
+	struct dentry *ret, *parent;
+	int err, npositive;
+	struct inode *inode;
+
+	LKTRTrace("dir %lu, %.*s\n", dir->i_ino, DLNPair(dentry));
+	DEBUG_ON(IS_ROOT(dentry));
+	IMustLock(dir);
+
+	parent = dentry->d_parent; // dget_parent()
+	aufs_read_lock(parent, !AUFS_I_RLOCK);
+	err = au_alloc_dinfo(dentry);
+	//if (LktrCond) err = -1;
+	ret = ERR_PTR(err);
+	if (unlikely(err))
+		goto out;
+
+	err = npositive = lkup_dentry(dentry, dbstart(parent), /*type*/0);
+	//err = -1;
+	ret = ERR_PTR(err);
+	if (unlikely(err < 0))
+		goto out_unlock;
+	inode = NULL;
+	if (npositive) {
+		inode = au_new_inode(dentry);
+		ret = (void*)inode;
+	}
+	if (!IS_ERR(inode)) {
+#if 1
+		/* d_splice_alias() also supports d_add() */
+		ret = d_splice_alias(inode, dentry);
+		if (unlikely(IS_ERR(ret) && inode))
+			ii_write_unlock(inode);
+#else
+		d_add(dentry, inode);
+#endif
+	}
+
+ out_unlock:
+	di_write_unlock(dentry);
+ out:
+	aufs_read_unlock(parent, !AUFS_I_RLOCK);
+	TraceErrPtr(ret);
+	return ret;
+}
+
+/* ---------------------------------------------------------------------- */
+
+/*
+ * decide the branch and the parent dir where we will create a new entry.
+ * returns new bindex or an error.
+ * copyup the parent dir if needed.
+ */
+int wr_dir(struct dentry *dentry, int add_entry, struct dentry *src_dentry,
+	   aufs_bindex_t force_btgt, int do_lock_srcdir)
+{
+	int err;
+	aufs_bindex_t bcpup, bstart, src_bstart;
+	struct dentry *hidden_parent;
+	struct super_block *sb;
+	struct dentry *parent, *src_parent = NULL;
+	struct inode *dir, *src_dir = NULL;
+
+	LKTRTrace("%.*s, add %d, src %p, force %d, lock_srcdir %d\n",
+		  DLNPair(dentry), add_entry, src_dentry, force_btgt,
+		  do_lock_srcdir);
+
+	sb = dentry->d_sb;
+	parent = dentry->d_parent; // dget_parent()
+	bcpup = bstart = dbstart(dentry);
+	if (force_btgt < 0) {
+		if (src_dentry) {
+			src_bstart = dbstart(src_dentry);
+			if (src_bstart < bstart)
+				bcpup = src_bstart;
+		}
+		if (test_ro(sb, bcpup, dentry->d_inode)) {
+			if (!add_entry)
+				di_read_lock_parent(parent, !AUFS_I_RLOCK);
+			bcpup = err = find_rw_parent_br(dentry, bcpup);
+			//bcpup = err = find_rw_br(sb, bcpup);
+			if (!add_entry)
+				di_read_unlock(parent, !AUFS_I_RLOCK);
+			//err = -1;
+			if (unlikely(err < 0))
+				goto out;
+		}
+	} else {
+		DEBUG_ON(bstart <= force_btgt
+			 || test_ro(sb, force_btgt, dentry->d_inode));
+		bcpup = force_btgt;
+	}
+	LKTRTrace("bstart %d, bcpup %d\n", bstart, bcpup);
+
+	err = bcpup;
+	if (bcpup == bstart)
+		goto out; /* success */
+
+	/* copyup the new parent into the branch we process */
+	hidden_parent = au_h_dptr(dentry)->d_parent; // dget_parent()
+	if (src_dentry) {
+		src_parent = src_dentry->d_parent; // dget_parent()
+		src_dir = src_parent->d_inode;
+		if (do_lock_srcdir)
+			di_write_lock_parent2(src_parent);
+	}
+
+	dir = parent->d_inode;
+	if (add_entry) {
+		au_update_dbstart(dentry);
+		IMustLock(dir);
+		DiMustWriteLock(parent);
+		IiMustWriteLock(dir);
+	} else
+		di_write_lock_parent(parent);
+
+	err = 0;
+	if (!au_h_dptr_i(parent, bcpup))
+		err = cpup_dirs(dentry, bcpup, src_parent);
+	//err = -1;
+	if (!err && add_entry) {
+		hidden_parent = au_h_dptr_i(parent, bcpup);
+		DEBUG_ON(!hidden_parent || !hidden_parent->d_inode);
+		hi_lock_parent(hidden_parent->d_inode);
+		err = lkup_neg(dentry, bcpup);
+		//err = -1;
+		i_unlock(hidden_parent->d_inode);
+	}
+
+	if (!add_entry)
+		di_write_unlock(parent);
+	if (do_lock_srcdir)
+		di_write_unlock(src_parent);
+	if (!err)
+		err = bcpup; /* success */
+	//err = -EPERM;
+ out:
+	TraceErr(err);
+	return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+static int aufs_setattr(struct dentry *dentry, struct iattr *ia)
+{
+	int err, isdir;
+	aufs_bindex_t bstart, bcpup;
+	struct inode *hidden_inode, *inode, *dir, *h_dir, *gh_dir, *gdir;
+	struct dentry *hidden_dentry, *parent;
+	unsigned int udba;
+
+	LKTRTrace("%.*s, ia_valid 0x%x\n", DLNPair(dentry), ia->ia_valid);
+	inode = dentry->d_inode;
+	IMustLock(inode);
+
+	aufs_read_lock(dentry, AUFS_D_WLOCK);
+	bstart = dbstart(dentry);
+	bcpup = err = wr_dir(dentry, /*add*/0, /*src_dentry*/NULL,
+			     /*force_btgt*/-1, /*do_lock_srcdir*/0);
+	//err = -1;
+	if (unlikely(err < 0))
+		goto out;
+
+	/* crazy udba locks */
+	udba = au_flag_test(dentry->d_sb, AuFlag_UDBA_INOTIFY);
+	parent = NULL;
+	gdir = gh_dir = dir = h_dir = NULL;
+	if ((udba || bstart != bcpup) && !IS_ROOT(dentry)) {
+		parent = dentry->d_parent; // dget_parent()
+		dir = parent->d_inode;
+		di_read_lock_parent(parent, AUFS_I_RLOCK);
+		h_dir = au_h_iptr_i(dir, bcpup);
+	}
+	if (parent) {
+		if (unlikely(udba && !IS_ROOT(parent))) {
+			gdir = parent->d_parent->d_inode;  // dget_parent()
+			ii_read_lock_parent2(gdir);
+			gh_dir = au_h_iptr_i(gdir, bcpup);
+			hgdir_lock(gh_dir, gdir, bcpup);
+		}
+		hdir_lock(h_dir, dir, bcpup);
+	}
+
+	isdir = S_ISDIR(inode->i_mode);
+	hidden_dentry = au_h_dptr(dentry);
+	hidden_inode = hidden_dentry->d_inode;
+	DEBUG_ON(!hidden_inode);
+
+#define HiLock(bindex) do {\
+	if (!isdir) \
+		hi_lock_child(hidden_inode); \
+	else \
+		hdir2_lock(hidden_inode, inode, bindex); \
+	} while (0)
+#define HiUnlock(bindex) do {\
+	if (!isdir) \
+		i_unlock(hidden_inode); \
+	else \
+		hdir_unlock(hidden_inode, inode, bindex); \
+	} while (0)
+
+	if (bstart != bcpup) {
+		loff_t size = -1;
+
+		if ((ia->ia_valid & ATTR_SIZE)
+		    && ia->ia_size < i_size_read(inode)) {
+			size = ia->ia_size;
+			ia->ia_valid &= ~ATTR_SIZE;
+		}
+		HiLock(bstart);
+		err = sio_cpup_simple(dentry, bcpup, size,
+				      au_flags_cpup(CPUP_DTIME, parent));
+		//err = -1;
+		HiUnlock(bstart);
+		if (unlikely(err || !ia->ia_valid))
+			goto out_unlock;
+
+		hidden_dentry = au_h_dptr(dentry);
+		hidden_inode = hidden_dentry->d_inode;
+		DEBUG_ON(!hidden_inode);
+	}
+
+	HiLock(bcpup);
+	err = vfsub_notify_change(hidden_dentry, ia, need_dlgt(dentry->d_sb));
+	//err = -1;
+	if (!err)
+		au_cpup_attr_changable(inode);
+	HiUnlock(bcpup);
+#undef HiLock
+#undef HiUnlock
+
+ out_unlock:
+	if (parent) {
+		hdir_unlock(h_dir, dir, bcpup);
+		di_read_unlock(parent, AUFS_I_RLOCK);
+	}
+	if (unlikely(gdir)) {
+		hdir_unlock(gh_dir, gdir, bcpup);
+		ii_read_unlock(gdir);
+	}
+ out:
+	aufs_read_unlock(dentry, AUFS_D_WLOCK);
+	TraceErr(err);
+	return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+static int hidden_readlink(struct dentry *dentry, int bindex,
+			   char __user * buf, int bufsiz)
+{
+	struct super_block *sb;
+	struct dentry *hidden_dentry;
+
+	hidden_dentry = au_h_dptr_i(dentry, bindex);
+	if (unlikely(!hidden_dentry->d_inode->i_op
+		     || !hidden_dentry->d_inode->i_op->readlink))
+		return -EINVAL;
+
+	sb = dentry->d_sb;
+	if (!test_ro(sb, bindex, dentry->d_inode)) {
+		touch_atime(sbr_mnt(sb, bindex), hidden_dentry);
+		dentry->d_inode->i_atime = hidden_dentry->d_inode->i_atime;
+	}
+	return hidden_dentry->d_inode->i_op->readlink
+		(hidden_dentry, buf, bufsiz);
+}
+
+static int aufs_readlink(struct dentry *dentry, char __user * buf, int bufsiz)
+{
+	int err;
+
+	LKTRTrace("%.*s, %d\n", DLNPair(dentry), bufsiz);
+
+	aufs_read_lock(dentry, AUFS_I_RLOCK);
+	err = hidden_readlink(dentry, dbstart(dentry), buf, bufsiz);
+	//err = -1;
+	aufs_read_unlock(dentry, AUFS_I_RLOCK);
+	TraceErr(err);
+	return err;
+}
+
+static void *aufs_follow_link(struct dentry *dentry, struct nameidata *nd)
+{
+	int err;
+	char *buf;
+	mm_segment_t old_fs;
+
+	LKTRTrace("%.*s, nd %.*s\n", DLNPair(dentry), DLNPair(nd->dentry));
+
+	err = -ENOMEM;
+	buf = __getname();
+	//buf = NULL;
+	if (unlikely(!buf))
+		goto out;
+
+	aufs_read_lock(dentry, AUFS_I_RLOCK);
+	old_fs = get_fs();
+	set_fs(KERNEL_DS);
+	err = hidden_readlink(dentry, dbstart(dentry), (char __user *)buf,
+			      PATH_MAX);
+	//err = -1;
+	set_fs(old_fs);
+	aufs_read_unlock(dentry, AUFS_I_RLOCK);
+
+	if (err >= 0) {
+		buf[err] = 0;
+		/* will be freed by put_link */
+		nd_set_link(nd, buf);
+		return NULL; /* success */
+	}
+	__putname(buf);
+
+ out:
+	path_release(nd);
+	TraceErr(err);
+	return ERR_PTR(err);
+}
+
+static void aufs_put_link(struct dentry *dentry, struct nameidata *nd,
+			  void *cookie)
+{
+	LKTRTrace("%.*s\n", DLNPair(dentry));
+	__putname(nd_get_link(nd));
+}
+
+/* ---------------------------------------------------------------------- */
+#if 0 // comment
+struct inode_operations {
+	int (*create) (struct inode *,struct dentry *,int, struct nameidata *);
+	struct dentry * (*lookup) (struct inode *,struct dentry *, struct nameidata *);
+	int (*link) (struct dentry *,struct inode *,struct dentry *);
+	int (*unlink) (struct inode *,struct dentry *);
+	int (*symlink) (struct inode *,struct dentry *,const char *);
+	int (*mkdir) (struct inode *,struct dentry *,int);
+	int (*rmdir) (struct inode *,struct dentry *);
+	int (*mknod) (struct inode *,struct dentry *,int,dev_t);
+	int (*rename) (struct inode *, struct dentry *,
+			struct inode *, struct dentry *);
+	int (*readlink) (struct dentry *, char __user *,int);
+	void * (*follow_link) (struct dentry *, struct nameidata *);
+	void (*put_link) (struct dentry *, struct nameidata *, void *);
+	void (*truncate) (struct inode *);
+	int (*permission) (struct inode *, int, struct nameidata *);
+	int (*setattr) (struct dentry *, struct iattr *);
+	int (*getattr) (struct vfsmount *mnt, struct dentry *, struct kstat *);
+	int (*setxattr) (struct dentry *, const char *,const void *,size_t,int);
+	ssize_t (*getxattr) (struct dentry *, const char *, void *, size_t);
+	ssize_t (*listxattr) (struct dentry *, char *, size_t);
+	int (*removexattr) (struct dentry *, const char *);
+	void (*truncate_range)(struct inode *, loff_t, loff_t);
+};
+#endif
+
+struct inode_operations aufs_symlink_iop = {
+	.permission	= aufs_permission,
+	.setattr	= aufs_setattr,
+
+	.readlink	= aufs_readlink,
+	.follow_link	= aufs_follow_link,
+	.put_link	= aufs_put_link
+};
+
+//i_op_add.c
+int aufs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev);
+int aufs_symlink(struct inode *dir, struct dentry *dentry, const char *symname);
+int aufs_create(struct inode *dir, struct dentry *dentry, int mode,
+		struct nameidata *nd);
+int aufs_link(struct dentry *src_dentry, struct inode *dir,
+	      struct dentry *dentry);
+int aufs_mkdir(struct inode *dir, struct dentry *dentry, int mode);
+
+//i_op_del.c
+int aufs_unlink(struct inode *dir, struct dentry *dentry);
+int aufs_rmdir(struct inode *dir, struct dentry *dentry);
+
+// i_op_ren.c
+int aufs_rename(struct inode *src_dir, struct dentry *src_dentry,
+		struct inode *dir, struct dentry *dentry);
+
+struct inode_operations aufs_dir_iop = {
+	.create		= aufs_create,
+	.lookup		= aufs_lookup,
+	.link		= aufs_link,
+	.unlink		= aufs_unlink,
+	.symlink	= aufs_symlink,
+	.mkdir		= aufs_mkdir,
+	.rmdir		= aufs_rmdir,
+	.mknod		= aufs_mknod,
+	.rename		= aufs_rename,
+
+	.permission	= aufs_permission,
+	.setattr	= aufs_setattr,
+
+#if 0 // xattr
+	.setxattr	= aufs_setxattr,
+	.getxattr	= aufs_getxattr,
+	.listxattr	= aufs_listxattr,
+	.removexattr	= aufs_removexattr
+#endif
+};
+
+struct inode_operations aufs_iop = {
+	.permission	= aufs_permission,
+	.setattr	= aufs_setattr,
+
+#if 0 // xattr
+	.setxattr	= aufs_setxattr,
+	.getxattr	= aufs_getxattr,
+	.listxattr	= aufs_listxattr,
+	.removexattr	= aufs_removexattr
+#endif
+};
diff --git a/fs/aufs/i_op_add.c b/fs/aufs/i_op_add.c
new file mode 100755
index 0000000..977d773
--- /dev/null
+++ b/fs/aufs/i_op_add.c
@@ -0,0 +1,621 @@
+/*
+ * Copyright (C) 2005, 2006, 2007 Junjiro Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+/* $Id: i_op_add.c,v 1.37 2007/05/07 03:46:08 sfjro Exp $ */
+
+//#include <linux/fs.h>
+//#include <linux/namei.h>
+#include "aufs.h"
+
+/*
+ * final procedure of adding a new entry, except link(2).
+ * remove whiteout, instantiate, copyup the parent dir's times and size
+ * and update version.
+ * if it failed, re-create the removed whiteout.
+ */
+static int epilog(struct dentry *wh_dentry, struct dentry *dentry)
+{
+	int err, rerr;
+	aufs_bindex_t bwh;
+	struct inode *inode, *dir;
+	struct dentry *wh;
+	struct lkup_args lkup;
+
+	LKTRTrace("wh %p, %.*s\n", wh_dentry, DLNPair(dentry));
+
+	lkup.dlgt = need_dlgt(dentry->d_sb);
+	bwh = -1;
+	if (wh_dentry) {
+		bwh = dbwh(dentry);
+		err = au_unlink_wh_dentry(wh_dentry->d_parent->d_inode,
+					  wh_dentry, dentry, lkup.dlgt);
+		//err = -1;
+		if (unlikely(err))
+			goto out;
+	}
+
+	inode = au_new_inode(dentry);
+	//inode = ERR_PTR(-1);
+	if (!IS_ERR(inode)) {
+		d_instantiate(dentry, inode);
+		dir = dentry->d_parent->d_inode;
+		/* or always cpup dir mtime? */
+		if (ibstart(dir) == dbstart(dentry))
+			au_cpup_attr_timesizes(dir);
+		dir->i_version++;
+		return 0; /* success */
+	}
+
+	err = PTR_ERR(inode);
+	if (!wh_dentry)
+		goto out;
+
+	/* revert */
+	lkup.nfsmnt = au_nfsmnt(dentry->d_sb, bwh);
+	wh = simple_create_wh(dentry, bwh, wh_dentry->d_parent, &lkup);
+	//wh = ERR_PTR(-1);
+	rerr = PTR_ERR(wh);
+	if (!IS_ERR(wh)) {
+		dput(wh);
+		goto out;
+	}
+	IOErr("%.*s reverting whiteout failed(%d, %d)\n",
+	      DLNPair(dentry), err, rerr);
+	err = -EIO;
+
+ out:
+	TraceErr(err);
+	return err;
+}
+
+/*
+ * initial procedure of adding a new entry.
+ * prepare writable branch and the parent dir, lock it,
+ * lookup whiteout for the new entry.
+ */
+static struct dentry *
+lock_hdir_lkup_wh(struct dentry *dentry, struct dtime *dt,
+		  struct dentry *src_dentry, int do_lock_srcdir)
+{
+	struct dentry *wh_dentry, *parent, *hidden_parent;
+	int err;
+	aufs_bindex_t bstart, bcpup;
+	struct inode *dir, *h_dir;
+	struct lkup_args lkup;
+
+	LKTRTrace("%.*s, src %p\n", DLNPair(dentry), src_dentry);
+
+	parent = dentry->d_parent;
+	bstart = dbstart(dentry);
+	bcpup = err = wr_dir(dentry, 1, src_dentry, -1, do_lock_srcdir);
+	//err = -1;
+	wh_dentry = ERR_PTR(err);
+	if (unlikely(err < 0))
+		goto out;
+
+	dir = parent->d_inode;
+	hidden_parent = au_h_dptr_i(parent, bcpup);
+	h_dir = hidden_parent->d_inode;
+	hdir_lock(h_dir, dir, bcpup);
+	if (dt)
+		dtime_store(dt, parent, hidden_parent);
+	if (/* bcpup != bstart || */ bcpup != dbwh(dentry))
+		return NULL; /* success */
+
+	lkup.nfsmnt = au_nfsmnt(parent->d_sb, bcpup);
+	lkup.dlgt = need_dlgt(parent->d_sb);
+	wh_dentry = lkup_wh(hidden_parent, &dentry->d_name, &lkup);
+	//wh_dentry = ERR_PTR(-1);
+	if (IS_ERR(wh_dentry))
+		hdir_unlock(h_dir, dir, bcpup);
+
+ out:
+	TraceErrPtr(wh_dentry);
+	return wh_dentry;
+}
+
+/* ---------------------------------------------------------------------- */
+
+enum {Mknod, Symlink, Creat};
+struct simple_arg {
+	int type;
+	union {
+		struct {
+			int mode;
+			struct nameidata *nd;
+		} c;
+		struct {
+			const char *symname;
+		} s;
+		struct {
+			int mode;
+			dev_t dev;
+		} m;
+	} u;
+};
+
+static int add_simple(struct inode *dir, struct dentry *dentry,
+		      struct simple_arg *arg)
+{
+	int err, dlgt;
+	struct dentry *hidden_dentry, *hidden_parent, *wh_dentry, *parent;
+	struct inode *hidden_dir;
+	struct dtime dt;
+
+	LKTRTrace("type %d, %.*s\n", arg->type, DLNPair(dentry));
+	IMustLock(dir);
+
+	aufs_read_lock(dentry, AUFS_D_WLOCK);
+	parent = dentry->d_parent;
+	di_write_lock_parent(parent);
+	wh_dentry = lock_hdir_lkup_wh(dentry, &dt, /*src_dentry*/NULL,
+				      /*do_lock_srcdir*/0);
+	//wh_dentry = ERR_PTR(-1);
+	err = PTR_ERR(wh_dentry);
+	if (IS_ERR(wh_dentry))
+		goto out;
+
+	hidden_dentry = au_h_dptr(dentry);
+	hidden_parent = hidden_dentry->d_parent;
+	hidden_dir = hidden_parent->d_inode;
+	IMustLock(hidden_dir);
+	dlgt = need_dlgt(dir->i_sb);
+
+#if 1 // partial testing
+	switch (arg->type) {
+	case Creat:
+#if 0
+		if (arg->u.c.nd) {
+			struct nameidata fake_nd;
+			fake_nd = *arg->u.c.nd;
+			fake_nd.dentry = dget(hidden_parent);
+			fake_nd.mnt = sbr_mnt(dentry->d_sb, dbstart(dentry));
+			mntget(fake_nd.mnt);
+			err = vfsub_create(hidden_dir, hidden_dentry,
+					   arg->u.c.mode, &fake_nd, dlgt);
+			path_release(&fake_nd);
+		} else
+#endif
+			err = vfsub_create(hidden_dir, hidden_dentry,
+					   arg->u.c.mode, NULL, dlgt);
+		break;
+	case Symlink:
+		err = vfsub_symlink(hidden_dir, hidden_dentry,
+				    arg->u.s.symname, S_IALLUGO, dlgt);
+		break;
+	case Mknod:
+		err = vfsub_mknod(hidden_dir, hidden_dentry,
+				  arg->u.m.mode, arg->u.m.dev, dlgt);
+		break;
+	default:
+		BUG();
+	}
+#else
+	err = -1;
+#endif
+	if (!err)
+		err = epilog(wh_dentry, dentry);
+	//err = -1;
+
+	/* revert */
+	if (unlikely(err && hidden_dentry->d_inode)) {
+		int rerr;
+		rerr = vfsub_unlink(hidden_dir, hidden_dentry, dlgt);
+		//rerr = -1;
+		if (rerr) {
+			IOErr("%.*s revert failure(%d, %d)\n",
+			      DLNPair(dentry), err, rerr);
+			err = -EIO;
+		}
+		dtime_revert(&dt, !CPUP_LOCKED_GHDIR);
+		d_drop(dentry);
+	}
+
+	hdir_unlock(hidden_dir, dir, dbstart(dentry));
+	dput(wh_dentry);
+
+ out:
+	if (unlikely(err)) {
+		au_update_dbstart(dentry);
+		d_drop(dentry);
+	}
+	di_write_unlock(parent);
+	aufs_read_unlock(dentry, AUFS_D_WLOCK);
+	TraceErr(err);
+	return err;
+}
+
+int aufs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev)
+{
+	struct simple_arg arg = {
+		.type = Mknod,
+		.u.m = {.mode = mode, .dev = dev}
+	};
+	return add_simple(dir, dentry, &arg);
+}
+
+int aufs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
+{
+	struct simple_arg arg = {
+		.type = Symlink,
+		.u.s.symname = symname
+	};
+	return add_simple(dir, dentry, &arg);
+}
+
+int aufs_create(struct inode *dir, struct dentry *dentry, int mode,
+		struct nameidata *nd)
+{
+	struct simple_arg arg = {
+		.type = Creat,
+		.u.c = {.mode = mode, .nd = nd}
+	};
+	return add_simple(dir, dentry, &arg);
+}
+
+/* ---------------------------------------------------------------------- */
+
+struct link_arg {
+	aufs_bindex_t bdst, bsrc;
+	int issamedir, dlgt;
+	struct dentry *src_parent, *parent, *hidden_dentry;
+	struct inode *hidden_dir, *inode;
+};
+
+static int cpup_before_link(struct dentry *src_dentry, struct inode *dir,
+			    struct link_arg *a)
+{
+	int err;
+	unsigned int flags;
+	struct inode *hi, *hdir = NULL, *src_dir;
+
+	TraceEnter();
+
+	err = 0;
+	flags = au_flags_cpup(CPUP_DTIME, a->parent);
+	src_dir = a->src_parent->d_inode;
+	if (!a->issamedir) {
+		// todo: dead lock?
+		di_read_lock_parent2(a->src_parent, AUFS_I_RLOCK);
+		// this temporary unlock/lock is safe
+		hdir_unlock(a->hidden_dir, dir, a->bdst);
+		err = test_and_cpup_dirs(src_dentry, a->bdst, a->parent);
+		//err = -1;
+		if (!err) {
+			hdir = au_h_iptr_i(src_dir, a->bdst);
+			hdir_lock(hdir, src_dir, a->bdst);
+			flags = au_flags_cpup(CPUP_DTIME, a->src_parent);
+		}
+	}
+
+	if (!err) {
+		hi = au_h_dptr(src_dentry)->d_inode;
+		hi_lock_child(hi);
+		err = sio_cpup_simple(src_dentry, a->bdst, -1, flags);
+		//err = -1;
+		i_unlock(hi);
+	}
+
+	if (!a->issamedir) {
+		if (hdir)
+			hdir_unlock(hdir, src_dir, a->bdst);
+		hdir_lock(a->hidden_dir, dir, a->bdst);
+		di_read_unlock(a->src_parent, AUFS_I_RLOCK);
+	}
+
+	TraceErr(err);
+	return err;
+}
+
+static int cpup_or_link(struct dentry *src_dentry, struct link_arg *a)
+{
+	int err;
+	struct inode *inode, *h_inode, *h_dst_inode;
+	struct dentry *h_dentry;
+	aufs_bindex_t bstart;
+	struct super_block *sb;
+
+	TraceEnter();
+
+	sb = src_dentry->d_sb;
+	inode = src_dentry->d_inode;
+	h_dentry = au_h_dptr(src_dentry);
+	h_inode = h_dentry->d_inode;
+	bstart = ibstart(inode);
+	h_dst_inode = NULL;
+	if (bstart <= a->bdst)
+		h_dst_inode = au_h_iptr_i(inode, a->bdst);
+
+	if (!h_dst_inode) {
+		/* copyup src_dentry as the name of dentry. */
+		set_dbstart(src_dentry, a->bdst);
+		set_h_dptr(src_dentry, a->bdst, dget(a->hidden_dentry));
+		hi_lock_child(h_inode);
+		err = sio_cpup_single(src_dentry, a->bdst, a->bsrc, -1,
+				      au_flags_cpup(!CPUP_DTIME, a->parent));
+		//err = -1;
+		i_unlock(h_inode);
+		set_h_dptr(src_dentry, a->bdst, NULL);
+		set_dbstart(src_dentry, a->bsrc);
+	} else {
+		/* the inode of src_dentry already exists on a.bdst branch */
+		h_dentry = d_find_alias(h_dst_inode);
+		if (h_dentry) {
+			err = vfsub_link(h_dentry, a->hidden_dir,
+					 a->hidden_dentry, a->dlgt);
+			dput(h_dentry);
+		} else {
+			IOErr("no dentry found for i%lu on b%d\n",
+			      h_dst_inode->i_ino, a->bdst);
+			err = -EIO;
+		}
+	}
+
+	if (!err)
+		append_plink(sb, a->inode, a->hidden_dentry, a->bdst);
+
+	TraceErr(err);
+	return err;
+}
+
+int aufs_link(struct dentry *src_dentry, struct inode *dir,
+	      struct dentry *dentry)
+{
+	int err, rerr;
+	struct dentry *hidden_parent, *wh_dentry, *hidden_src_dentry;
+	struct dtime dt;
+	struct link_arg a;
+	struct super_block *sb;
+
+	LKTRTrace("src %.*s, i%lu, dst %.*s\n",
+		  DLNPair(src_dentry), dir->i_ino, DLNPair(dentry));
+	IMustLock(dir);
+	IMustLock(src_dentry->d_inode);
+
+	aufs_read_and_write_lock2(dentry, src_dentry, /*isdir*/0);
+	a.src_parent = src_dentry->d_parent;
+	a.parent = dentry->d_parent;
+	a.issamedir = (a.src_parent == a.parent);
+	di_write_lock_parent(a.parent);
+	wh_dentry = lock_hdir_lkup_wh(dentry, &dt, src_dentry, !a.issamedir);
+	//wh_dentry = ERR_PTR(-1);
+	err = PTR_ERR(wh_dentry);
+	if (IS_ERR(wh_dentry))
+		goto out;
+
+	a.inode = src_dentry->d_inode;
+	a.hidden_dentry = au_h_dptr(dentry);
+	hidden_parent = a.hidden_dentry->d_parent;
+	a.hidden_dir = hidden_parent->d_inode;
+	IMustLock(a.hidden_dir);
+
+	err = 0;
+	sb = dentry->d_sb;
+	a.dlgt = need_dlgt(sb);
+
+	//todo: minor optimize, their sb may be same while their bindex differs.
+	a.bsrc = dbstart(src_dentry);
+	a.bdst = dbstart(dentry);
+	hidden_src_dentry = au_h_dptr(src_dentry);
+	if (unlikely(!au_flag_test(sb, AuFlag_PLINK))) {
+		/*
+		 * copyup src_dentry to the branch we process,
+		 * and then link(2) to it.
+		 * gave up 'pseudo link by cpup' approach,
+		 * since nlink may be one and some applications will not work.
+		 */
+		if (a.bdst < a.bsrc
+		    /* && hidden_src_dentry->d_sb != a.hidden_dentry->d_sb */)
+			err = cpup_before_link(src_dentry, dir, &a);
+		if (!err) {
+			hidden_src_dentry = au_h_dptr(src_dentry);
+			err = vfsub_link(hidden_src_dentry, a.hidden_dir,
+					 a.hidden_dentry, a.dlgt);
+			//err = -1;
+		}
+	} else {
+		if (a.bdst < a.bsrc
+		    /* && hidden_src_dentry->d_sb != a.hidden_dentry->d_sb */)
+			err = cpup_or_link(src_dentry, &a);
+		else {
+			hidden_src_dentry = au_h_dptr(src_dentry);
+			err = vfsub_link(hidden_src_dentry, a.hidden_dir,
+					 a.hidden_dentry, a.dlgt);
+			//err = -1;
+		}
+	}
+	if (unlikely(err))
+		goto out_unlock;
+	if (wh_dentry) {
+		err = au_unlink_wh_dentry(a.hidden_dir, wh_dentry, dentry,
+					  a.dlgt);
+		//err = -1;
+		if (unlikely(err))
+			goto out_revert;
+	}
+
+	dir->i_version++;
+	if (ibstart(dir) == dbstart(dentry))
+		au_cpup_attr_timesizes(dir);
+	if (!d_unhashed(a.hidden_dentry)
+	    /* || hidden_old_inode->i_nlink <= nlink */
+	    /* || SB_NFS(hidden_src_dentry->d_sb) */) {
+		dentry->d_inode = igrab(a.inode);
+		d_instantiate(dentry, a.inode);
+		a.inode->i_nlink++;
+		a.inode->i_ctime = dir->i_ctime;
+	} else
+		/* nfs case (< 2.6.15) */
+		d_drop(dentry);
+#if 0
+	au_debug_on();
+	DbgInode(a.inode);
+	au_debug_off();
+	{
+		aufs_bindex_t i;
+		for (i = ibstart(a.inode); i <= ibend(a.inode); i++) {
+			struct xino xino;
+			struct inode *hi;
+			hi = au_h_iptr_i(a.inode, i);
+			if (hi) {
+				xino_read(sb, i, hi->i_ino, &xino);
+				Dbg("hi%lu, i%lu\n", hi->i_ino, xino.ino);
+			}
+		}
+	}
+#endif
+	goto out_unlock; /* success */
+
+ out_revert:
+#if 0 // remove
+	if (d_unhashed(a.hidden_dentry)) {
+		/* hardlink on nfs (< 2.6.15) */
+		struct dentry *d;
+		const struct qstr *name = &a.hidden_dentry->d_name;
+		DEBUG_ON(a.hidden_dentry->d_parent->d_inode != a.hidden_dir);
+		// do not superio.
+		d = lkup_one(name->name, a.hidden_dentry->d_parent, name->len,
+			     au_nfsmnt(sb, a.bdst)??, need_dlgt(sb));
+		rerr = PTR_ERR(d);
+		if (IS_ERR(d))
+			goto out_rerr;
+		dput(a.hidden_dentry);
+		a.hidden_dentry = d;
+		DEBUG_ON(!d->d_inode);
+	}
+#endif
+	rerr = vfsub_unlink(a.hidden_dir, a.hidden_dentry, a.dlgt);
+	//rerr = -1;
+	if (!rerr)
+		goto out_dt;
+// out_rerr:
+	IOErr("%.*s reverting failed(%d, %d)\n", DLNPair(dentry), err, rerr);
+	err = -EIO;
+ out_dt:
+	d_drop(dentry);
+	dtime_revert(&dt, !CPUP_LOCKED_GHDIR);
+ out_unlock:
+	hdir_unlock(a.hidden_dir, dir, a.bdst);
+	dput(wh_dentry);
+ out:
+	if (unlikely(err)) {
+		au_update_dbstart(dentry);
+		d_drop(dentry);
+	}
+	di_write_unlock(a.parent);
+	aufs_read_and_write_unlock2(dentry, src_dentry);
+	TraceErr(err);
+	return err;
+}
+
+int aufs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
+{
+	int err, rerr, diropq, dlgt;
+	struct dentry *hidden_dentry, *hidden_parent, *wh_dentry, *parent,
+		*opq_dentry;
+	struct inode *hidden_dir, *hidden_inode;
+	struct dtime dt;
+	aufs_bindex_t bindex;
+	struct super_block *sb;
+
+	LKTRTrace("i%lu, %.*s, mode 0%o\n", dir->i_ino, DLNPair(dentry), mode);
+	IMustLock(dir);
+
+	aufs_read_lock(dentry, AUFS_D_WLOCK);
+	parent = dentry->d_parent;
+	di_write_lock_parent(parent);
+	wh_dentry = lock_hdir_lkup_wh(dentry, &dt, /*src_dentry*/NULL,
+				      /*do_lock_srcdir*/0);
+	//wh_dentry = ERR_PTR(-1);
+	err = PTR_ERR(wh_dentry);
+	if (IS_ERR(wh_dentry))
+		goto out;
+
+	sb = dentry->d_sb;
+	bindex = dbstart(dentry);
+	hidden_dentry = au_h_dptr(dentry);
+	hidden_parent = hidden_dentry->d_parent;
+	hidden_dir = hidden_parent->d_inode;
+	IMustLock(hidden_dir);
+	dlgt = need_dlgt(sb);
+
+	err = vfsub_mkdir(hidden_dir, hidden_dentry, mode, dlgt);
+	//err = -1;
+	if (unlikely(err))
+		goto out_unlock;
+	hidden_inode = hidden_dentry->d_inode;
+
+	/* make the dir opaque */
+	diropq = 0;
+	if (unlikely(wh_dentry || au_flag_test(sb, AuFlag_ALWAYS_DIROPQ))) {
+		hi_lock_child(hidden_inode);
+		opq_dentry = create_diropq(dentry, bindex, dlgt);
+		//opq_dentry = ERR_PTR(-1);
+		i_unlock(hidden_inode);
+		err = PTR_ERR(opq_dentry);
+		if (IS_ERR(opq_dentry))
+			goto out_dir;
+		dput(opq_dentry);
+		diropq = 1;
+	}
+
+	err = epilog(wh_dentry, dentry);
+	//err = -1;
+	if (!err) {
+		dir->i_nlink++;
+		goto out_unlock; /* success */
+	}
+
+	/* revert */
+	if (unlikely(diropq)) {
+		LKTRLabel(revert opq);
+		hi_lock_child(hidden_inode);
+		rerr = remove_diropq(dentry, bindex, dlgt);
+		//rerr = -1;
+		i_unlock(hidden_inode);
+		if (rerr) {
+			IOErr("%.*s reverting diropq failed(%d, %d)\n",
+			      DLNPair(dentry), err, rerr);
+			err = -EIO;
+		}
+	}
+
+ out_dir:
+	LKTRLabel(revert dir);
+	rerr = vfsub_rmdir(hidden_dir, hidden_dentry, dlgt);
+	//rerr = -1;
+	if (rerr) {
+		IOErr("%.*s reverting dir failed(%d, %d)\n",
+		      DLNPair(dentry), err, rerr);
+		err = -EIO;
+	}
+	d_drop(dentry);
+	dtime_revert(&dt, /*fake flag*/CPUP_LOCKED_GHDIR);
+ out_unlock:
+	hdir_unlock(hidden_dir, dir, bindex);
+	dput(wh_dentry);
+ out:
+	if (unlikely(err)) {
+		au_update_dbstart(dentry);
+		d_drop(dentry);
+	}
+	di_write_unlock(parent);
+	aufs_read_unlock(dentry, AUFS_D_WLOCK);
+	TraceErr(err);
+	return err;
+}
diff --git a/fs/aufs/i_op_del.c b/fs/aufs/i_op_del.c
new file mode 100755
index 0000000..f29b204
--- /dev/null
+++ b/fs/aufs/i_op_del.c
@@ -0,0 +1,414 @@
+/*
+ * Copyright (C) 2005, 2006, 2007 Junjiro Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+/* $Id: i_op_del.c,v 1.35 2007/05/14 03:41:52 sfjro Exp $ */
+
+#include "aufs.h"
+
+/* returns,
+ * 0: wh is unnecessary
+ * plus: wh is necessary
+ * minus: error
+ */
+int wr_dir_need_wh(struct dentry *dentry, int isdir, aufs_bindex_t *bcpup,
+		   struct dentry *locked)
+{
+	int need_wh, err;
+	aufs_bindex_t bstart;
+	struct dentry *hidden_dentry;
+	struct super_block *sb;
+
+	LKTRTrace("%.*s, isdir %d, *bcpup %d, locked %p\n",
+		  DLNPair(dentry), isdir, *bcpup, locked);
+	sb = dentry->d_sb;
+
+	bstart = dbstart(dentry);
+	LKTRTrace("bcpup %d, bstart %d\n", *bcpup, bstart);
+	hidden_dentry = au_h_dptr(dentry);
+	if (*bcpup < 0) {
+		*bcpup = bstart;
+		if (test_ro(sb, bstart, dentry->d_inode)) {
+			*bcpup = err = find_rw_parent_br(dentry, bstart);
+			//*bcpup = err = find_rw_br(sb, bstart);
+			//err = -1;
+			if (unlikely(err < 0))
+				goto out;
+		}
+	} else {
+		/* braces are added to stop a warning */
+		DEBUG_ON(bstart < *bcpup
+			 || test_ro(sb, *bcpup, dentry->d_inode));
+	}
+	LKTRTrace("bcpup %d, bstart %d\n", *bcpup, bstart);
+
+	if (*bcpup != bstart) {
+		err = cpup_dirs(dentry, *bcpup, locked);
+		//err = -1;
+		if (unlikely(err))
+			goto out;
+		need_wh = 1;
+	} else {
+		//struct nameidata nd;
+		aufs_bindex_t old_bend, new_bend, bdiropq = -1;
+		old_bend = dbend(dentry);
+		if (isdir) {
+			bdiropq = dbdiropq(dentry);
+			set_dbdiropq(dentry, -1);
+		}
+		err = need_wh = lkup_dentry(dentry, bstart + 1, /*type*/0);
+		//err = -1;
+		if (isdir)
+			set_dbdiropq(dentry, bdiropq);
+		if (unlikely(err < 0))
+			goto out;
+		new_bend = dbend(dentry);
+		if (!need_wh && old_bend != new_bend) {
+			set_h_dptr(dentry, new_bend, NULL);
+			set_dbend(dentry, old_bend);
+#if 0
+		} else if (!au_h_dptr_i(dentry, new_bend)->d_inode) {
+			LKTRTrace("negative\n");
+			set_h_dptr(dentry, new_bend, NULL);
+			set_dbend(dentry, old_bend);
+			need_wh = 0;
+#endif
+		}
+	}
+	LKTRTrace("need_wh %d\n", need_wh);
+	err = need_wh;
+
+ out:
+	TraceErr(err);
+	return err;
+}
+
+static struct dentry *
+lock_hdir_create_wh(struct dentry *dentry, int isdir, aufs_bindex_t *bcpup,
+		    struct dtime *dt)
+{
+	struct dentry *wh_dentry;
+	int err, need_wh;
+	struct dentry *hidden_parent, *parent;
+	struct inode *dir, *h_dir;
+	struct lkup_args lkup;
+
+	LKTRTrace("%.*s, isdir %d\n", DLNPair(dentry), isdir);
+
+	err = need_wh = wr_dir_need_wh(dentry, isdir, bcpup, NULL);
+	//err = -1;
+	wh_dentry = ERR_PTR(err);
+	if (unlikely(err < 0))
+		goto out;
+
+	parent = dentry->d_parent;
+	dir = parent->d_inode;
+	hidden_parent = au_h_dptr_i(parent, *bcpup);
+	h_dir = hidden_parent->d_inode;
+	hdir_lock(h_dir, dir, *bcpup);
+	dtime_store(dt, parent, hidden_parent);
+	if (!need_wh)
+		return NULL; /* success, no need to create whiteout */
+
+	lkup.nfsmnt = au_nfsmnt(dentry->d_sb, *bcpup);
+	lkup.dlgt = need_dlgt(dentry->d_sb);
+	wh_dentry = simple_create_wh(dentry, *bcpup, hidden_parent, &lkup);
+	//wh_dentry = ERR_PTR(-1);
+	if (!IS_ERR(wh_dentry))
+		goto out; /* success */
+	/* returns with the parent is locked and wh_dentry is DGETed */
+
+	hdir_unlock(h_dir, dir, *bcpup);
+
+ out:
+	TraceErrPtr(wh_dentry);
+	return wh_dentry;
+}
+
+static int renwh_and_rmdir(struct dentry *dentry, aufs_bindex_t bindex,
+			   struct aufs_nhash *whlist, struct inode *dir)
+{
+	int rmdir_later, err;
+	struct dentry *hidden_dentry;
+
+	LKTRTrace("%.*s, b%d\n", DLNPair(dentry), bindex);
+
+	err = rename_whtmp(dentry, bindex);
+	//err = -1;
+#if 0
+	//todo: bug
+	if (unlikely(err)) {
+		au_direval_inc(dentry->d_parent);
+		return err;
+	}
+#endif
+
+	hidden_dentry = au_h_dptr_i(dentry, bindex);
+	if (!au_is_nfs(hidden_dentry->d_sb)) {
+		const int dirwh = stosi(dentry->d_sb)->si_dirwh;
+		rmdir_later = (dirwh <= 1);
+		if (!rmdir_later)
+			rmdir_later = is_longer_wh(whlist, bindex, dirwh);
+		if (rmdir_later)
+			return rmdir_later;
+	}
+
+	err = rmdir_whtmp(hidden_dentry, whlist, bindex, dir, dentry->d_inode);
+	//err = -1;
+	if (unlikely(err)) {
+		IOErr("rmdir %.*s, b%d failed, %d. ignored\n",
+		      DLNPair(hidden_dentry), bindex, err);
+		err = 0;
+	}
+	TraceErr(err);
+	return err;
+}
+
+static void epilog(struct inode *dir, struct dentry *dentry,
+		   aufs_bindex_t bindex)
+{
+	d_drop(dentry);
+	dentry->d_inode->i_ctime = dir->i_ctime;
+	if (atomic_read(&dentry->d_count) == 1) {
+		set_h_dptr(dentry, dbstart(dentry), NULL);
+		au_update_dbstart(dentry);
+	}
+	if (ibstart(dir) == bindex)
+		au_cpup_attr_timesizes(dir);
+	dir->i_version++;
+}
+
+static int do_revert(int err, struct dentry *wh_dentry, struct dentry *dentry,
+		     aufs_bindex_t bwh, struct dtime *dt, int dlgt)
+{
+	int rerr;
+
+	rerr = au_unlink_wh_dentry(wh_dentry->d_parent->d_inode, wh_dentry,
+				   dentry, dlgt);
+	//rerr = -1;
+	if (!rerr) {
+		set_dbwh(dentry, bwh);
+		dtime_revert(dt, !CPUP_LOCKED_GHDIR);
+		return 0;
+	}
+
+	IOErr("%.*s reverting whiteout failed(%d, %d)\n",
+	      DLNPair(dentry), err, rerr);
+	return -EIO;
+}
+
+/* ---------------------------------------------------------------------- */
+
+int aufs_unlink(struct inode *dir, struct dentry *dentry)
+{
+	int err, dlgt;
+	struct inode *inode, *hidden_dir;
+	struct dentry *parent, *wh_dentry, *hidden_dentry, *hidden_parent;
+	struct dtime dt;
+	aufs_bindex_t bwh, bindex, bstart;
+	struct super_block *sb;
+
+	LKTRTrace("i%lu, %.*s\n", dir->i_ino, DLNPair(dentry));
+	IMustLock(dir);
+	inode = dentry->d_inode;
+	if (unlikely(!inode))
+		return -ENOENT; // possible?
+	IMustLock(inode);
+
+	aufs_read_lock(dentry, AUFS_D_WLOCK);
+	parent = dentry->d_parent;
+	di_write_lock_parent(parent);
+
+	bstart = dbstart(dentry);
+	bwh = dbwh(dentry);
+	bindex = -1;
+	wh_dentry = lock_hdir_create_wh(dentry, /*isdir*/0, &bindex, &dt);
+	//wh_dentry = ERR_PTR(-1);
+	err = PTR_ERR(wh_dentry);
+	if (IS_ERR(wh_dentry))
+		goto out;
+
+	sb = dir->i_sb;
+	dlgt = need_dlgt(sb);
+	hidden_dentry = au_h_dptr(dentry);
+	dget(hidden_dentry);
+	hidden_parent = hidden_dentry->d_parent;
+	hidden_dir = hidden_parent->d_inode;
+
+	if (bindex == bstart) {
+		err = vfsub_unlink(hidden_dir, hidden_dentry, dlgt);
+		//err = -1;
+	} else {
+		DEBUG_ON(!wh_dentry);
+		hidden_parent = wh_dentry->d_parent;
+		DEBUG_ON(hidden_parent != au_h_dptr_i(parent, bindex));
+		hidden_dir = hidden_parent->d_inode;
+		IMustLock(hidden_dir);
+		err = 0;
+	}
+
+	if (!err) {
+		inode->i_nlink--;
+		epilog(dir, dentry, bindex);
+#if 0
+		xino_write0(sb, bstart, hidden_dentry->d_inode->i_ino);
+		/* ignore this error */
+#endif
+		goto out_unlock; /* success */
+	}
+
+	/* revert */
+	if (wh_dentry) {
+		int rerr;
+		rerr = do_revert(err, wh_dentry, dentry, bwh, &dt, dlgt);
+		if (rerr)
+			err = rerr;
+	}
+
+ out_unlock:
+	hdir_unlock(hidden_dir, dir, bindex);
+	dput(wh_dentry);
+	dput(hidden_dentry);
+ out:
+	di_write_unlock(parent);
+	aufs_read_unlock(dentry, AUFS_D_WLOCK);
+	TraceErr(err);
+	return err;
+}
+
+int aufs_rmdir(struct inode *dir, struct dentry *dentry)
+{
+	int err, rmdir_later;
+	struct inode *inode, *hidden_dir;
+	struct dentry *parent, *wh_dentry, *hidden_dentry, *hidden_parent;
+	struct dtime dt;
+	aufs_bindex_t bwh, bindex, bstart;
+	struct rmdir_whtmp_arg *arg;
+	struct aufs_nhash *whlist;
+	struct super_block *sb;
+
+	LKTRTrace("i%lu, %.*s\n", dir->i_ino, DLNPair(dentry));
+	IMustLock(dir);
+	inode = dentry->d_inode;
+	if (unlikely(!inode))
+		return -ENOENT; // possible?
+	IMustLock(inode);
+
+	whlist = nhash_new(GFP_KERNEL);
+	err = PTR_ERR(whlist);
+	if (IS_ERR(whlist))
+		goto out;
+
+	err = -ENOMEM;
+	arg = kmalloc(sizeof(*arg), GFP_KERNEL);
+	//arg = NULL;
+	if (unlikely(!arg))
+		goto out_whlist;
+
+	aufs_read_lock(dentry, AUFS_D_WLOCK);
+	parent = dentry->d_parent;
+	di_write_lock_parent(parent);
+	err = test_empty(dentry, whlist);
+	//err = -1;
+	if (unlikely(err))
+		goto out_arg;
+
+	bstart = dbstart(dentry);
+	bwh = dbwh(dentry);
+	bindex = -1;
+	wh_dentry = lock_hdir_create_wh(dentry, /*isdir*/ 1, &bindex, &dt);
+	//wh_dentry = ERR_PTR(-1);
+	err = PTR_ERR(wh_dentry);
+	if (IS_ERR(wh_dentry))
+		goto out_arg;
+
+	hidden_dentry = au_h_dptr(dentry);
+	dget(hidden_dentry);
+	hidden_parent = hidden_dentry->d_parent;
+	hidden_dir = hidden_parent->d_inode;
+
+	rmdir_later = 0;
+	if (bindex == bstart) {
+		IMustLock(hidden_dir);
+		err = renwh_and_rmdir(dentry, bstart, whlist, dir);
+		//err = -1;
+		if (err > 0) {
+			rmdir_later = err;
+			err = 0;
+		}
+	} else {
+		DEBUG_ON(!wh_dentry);
+		hidden_parent = wh_dentry->d_parent;
+		DEBUG_ON(hidden_parent != au_h_dptr_i(parent, bindex));
+		hidden_dir = hidden_parent->d_inode;
+		IMustLock(hidden_dir);
+		err = 0;
+	}
+
+	sb = dentry->d_sb;
+	if (!err) {
+		//aufs_bindex_t bi, bend;
+
+		au_reset_hinotify(inode, /*flags*/0);
+		inode->i_nlink = 0;
+		set_dbdiropq(dentry, -1);
+		epilog(dir, dentry, bindex);
+
+		if (rmdir_later) {
+			kick_rmdir_whtmp(hidden_dentry, whlist, bstart, dir,
+					 inode, arg);
+			arg = NULL;
+		}
+
+#if 0
+		bend = dbend(dentry);
+		for (bi = bstart; bi <= bend; bi++) {
+			struct dentry *hd;
+			hd = au_h_dptr_i(dentry, bi);
+			if (hd && hd->d_inode)
+				xino_write0(sb, bi, hd->d_inode->i_ino);
+			/* ignore this error */
+		}
+#endif
+
+		goto out_unlock; /* success */
+	}
+
+	/* revert */
+	LKTRLabel(revert);
+	if (wh_dentry) {
+		int rerr;
+		rerr = do_revert(err, wh_dentry, dentry, bwh, &dt,
+				 need_dlgt(sb));
+		if (rerr)
+			err = rerr;
+	}
+
+ out_unlock:
+	hdir_unlock(hidden_dir, dir, bindex);
+	dput(wh_dentry);
+	dput(hidden_dentry);
+ out_arg:
+	di_write_unlock(parent);
+	aufs_read_unlock(dentry, AUFS_D_WLOCK);
+	kfree(arg);
+ out_whlist:
+	nhash_del(whlist);
+ out:
+	TraceErr(err);
+	return err;
+}
diff --git a/fs/aufs/i_op_ren.c b/fs/aufs/i_op_ren.c
new file mode 100755
index 0000000..08137f9
--- /dev/null
+++ b/fs/aufs/i_op_ren.c
@@ -0,0 +1,637 @@
+/*
+ * Copyright (C) 2005, 2006, 2007 Junjiro Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+/* $Id: i_op_ren.c,v 1.39 2007/05/14 03:41:52 sfjro Exp $ */
+
+//#include <linux/fs.h>
+//#include <linux/namei.h>
+#include "aufs.h"
+
+enum {SRC, DST};
+struct rename_args {
+	struct dentry *hidden_dentry[2], *parent[2], *hidden_parent[2];
+	struct aufs_nhash whlist;
+	aufs_bindex_t btgt, bstart[2];
+	struct super_block *sb;
+
+	unsigned int isdir:1;
+	unsigned int issamedir:1;
+	unsigned int whsrc:1;
+	unsigned int whdst:1;
+	unsigned int dlgt:1;
+} __attribute__((aligned(sizeof(long))));
+
+static int do_rename(struct inode *src_dir, struct dentry *src_dentry,
+		     struct inode *dir, struct dentry *dentry,
+		     struct rename_args *a)
+{
+	int err, need_diropq, bycpup, rerr;
+	struct rmdir_whtmp_arg *tharg;
+	struct dentry *wh_dentry[2], *hidden_dst, *hg_parent;
+	struct inode *hidden_dir[2];
+	aufs_bindex_t bindex, bend;
+	unsigned int flags;
+	struct lkup_args lkup = {.dlgt = a->dlgt};
+
+	LKTRTrace("%.*s/%.*s, %.*s/%.*s, "
+		  "hd{%p, %p}, hp{%p, %p}, wh %p, btgt %d, bstart{%d, %d}, "
+		  "flags{%d, %d, %d, %d}\n",
+		  DLNPair(a->parent[SRC]), DLNPair(src_dentry),
+		  DLNPair(a->parent[DST]), DLNPair(dentry),
+		  a->hidden_dentry[SRC], a->hidden_dentry[DST],
+		  a->hidden_parent[SRC], a->hidden_parent[DST],
+		  &a->whlist, a->btgt,
+		  a->bstart[SRC], a->bstart[DST],
+		  a->isdir, a->issamedir, a->whsrc, a->whdst);
+	hidden_dir[SRC] = a->hidden_parent[SRC]->d_inode;
+	hidden_dir[DST] = a->hidden_parent[DST]->d_inode;
+	IMustLock(hidden_dir[SRC]);
+	IMustLock(hidden_dir[DST]);
+
+	/* prepare workqueue arg */
+	hidden_dst = NULL;
+	tharg = NULL;
+	if (a->isdir && a->hidden_dentry[DST]->d_inode) {
+		err = -ENOMEM;
+		tharg = kmalloc(sizeof(*tharg), GFP_KERNEL);
+		//tharg = NULL;
+		if (unlikely(!tharg))
+			goto out;
+		hidden_dst = dget(a->hidden_dentry[DST]);
+	}
+
+	wh_dentry[SRC] = wh_dentry[DST] = NULL;
+	lkup.nfsmnt = au_nfsmnt(a->sb, a->btgt);
+	/* create whiteout for src_dentry */
+	if (a->whsrc) {
+		wh_dentry[SRC] = simple_create_wh(src_dentry, a->btgt,
+						  a->hidden_parent[SRC], &lkup);
+		//wh_dentry[SRC] = ERR_PTR(-1);
+		err = PTR_ERR(wh_dentry[SRC]);
+		if (IS_ERR(wh_dentry[SRC]))
+			goto out_tharg;
+	}
+
+	/* lookup whiteout for dentry */
+	if (a->whdst) {
+		struct dentry *d;
+		d = lkup_wh(a->hidden_parent[DST], &dentry->d_name, &lkup);
+		//d = ERR_PTR(-1);
+		err = PTR_ERR(d);
+		if (IS_ERR(d))
+			goto out_whsrc;
+		if (!d->d_inode)
+			dput(d);
+		else
+			wh_dentry[DST] = d;
+	}
+
+	/* rename dentry to tmpwh */
+	if (tharg) {
+		err = rename_whtmp(dentry, a->btgt);
+		//err = -1;
+		if (unlikely(err))
+			goto out_whdst;
+		set_h_dptr(dentry, a->btgt, NULL);
+		err = lkup_neg(dentry, a->btgt);
+		//err = -1;
+		if (unlikely(err))
+			goto out_whtmp;
+		a->hidden_dentry[DST] = au_h_dptr_i(dentry, a->btgt);
+	}
+
+	/* cpup src */
+	if (a->hidden_dentry[DST]->d_inode && a->bstart[SRC] != a->btgt) {
+		flags = au_flags_cpup(!CPUP_DTIME, a->parent[SRC]);
+		hg_parent = a->hidden_parent[SRC]->d_parent;
+		if (!(flags & CPUP_LOCKED_GHDIR)
+		    && hg_parent == a->hidden_parent[DST])
+			flags |= CPUP_LOCKED_GHDIR;
+
+		hi_lock_child(a->hidden_dentry[SRC]->d_inode);
+		err = sio_cpup_simple(src_dentry, a->btgt, -1, flags);
+		//err = -1; // untested dir
+		i_unlock(a->hidden_dentry[SRC]->d_inode);
+		if (unlikely(err))
+			goto out_whtmp;
+	}
+
+#if 0
+	/* clear the target ino in xino */
+	LKTRTrace("dir %d, dst inode %p\n", a->isdir, a->hidden_dentry[DST]->d_inode);
+	if (a->isdir && a->hidden_dentry[DST]->d_inode) {
+		Dbg("here\n");
+		err = xino_write(a->sb, a->btgt,
+				 a->hidden_dentry[DST]->d_inode->i_ino, 0);
+		if (unlikely(err))
+			goto out_whtmp;
+	}
+#endif
+
+	/* rename by vfs_rename or cpup */
+	need_diropq = a->isdir
+		&& (wh_dentry[DST]
+		    || dbdiropq(dentry) == a->btgt
+		    || au_flag_test(a->sb, AuFlag_ALWAYS_DIROPQ));
+	bycpup = 0;
+	if (dbstart(src_dentry) == a->btgt) {
+		if (need_diropq && dbdiropq(src_dentry) == a->btgt)
+			need_diropq = 0;
+		err = vfsub_rename(hidden_dir[SRC], au_h_dptr(src_dentry),
+				   hidden_dir[DST], a->hidden_dentry[DST],
+				   a->dlgt);
+		//err = -1;
+	} else {
+		bycpup = 1;
+		flags = au_flags_cpup(!CPUP_DTIME, a->parent[DST]);
+		hg_parent = a->hidden_parent[DST]->d_parent;
+		if (!(flags & CPUP_LOCKED_GHDIR)
+		    && hg_parent == a->hidden_parent[SRC])
+			flags |= CPUP_LOCKED_GHDIR;
+
+		hi_lock_child(a->hidden_dentry[SRC]->d_inode);
+		set_dbstart(src_dentry, a->btgt);
+		set_h_dptr(src_dentry, a->btgt, dget(a->hidden_dentry[DST]));
+		//DbgDentry(src_dentry);
+		//DbgInode(src_dentry->d_inode);
+		err = sio_cpup_single(src_dentry, a->btgt, a->bstart[SRC], -1,
+				      flags);
+		//err = -1; // untested dir
+		if (unlikely(err)) {
+			set_h_dptr(src_dentry, a->btgt, NULL);
+			set_dbstart(src_dentry, a->bstart[SRC]);
+		}
+		i_unlock(a->hidden_dentry[SRC]->d_inode);
+	}
+	if (unlikely(err))
+		goto out_whtmp;
+
+	/* make dir opaque */
+	if (need_diropq) {
+		struct dentry *diropq;
+		struct inode *h_inode;
+
+		h_inode = au_h_dptr_i(src_dentry, a->btgt)->d_inode;
+		hdir_lock(h_inode, src_dentry->d_inode, a->btgt);
+		diropq = create_diropq(src_dentry, a->btgt, a->dlgt);
+		//diropq = ERR_PTR(-1);
+		hdir_unlock(h_inode, src_dentry->d_inode, a->btgt);
+		err = PTR_ERR(diropq);
+		if (IS_ERR(diropq))
+			goto out_rename;
+		dput(diropq);
+	}
+
+	/* remove whiteout for dentry */
+	if (wh_dentry[DST]) {
+		err = au_unlink_wh_dentry(hidden_dir[DST], wh_dentry[DST],
+					  dentry, a->dlgt);
+		//err = -1;
+		if (unlikely(err))
+			goto out_diropq;
+	}
+
+	/* remove whtmp */
+	if (tharg) {
+		if (au_is_nfs(hidden_dst->d_sb)
+		    || !is_longer_wh(&a->whlist, a->btgt,
+				     stosi(a->sb)->si_dirwh)) {
+			err = rmdir_whtmp(hidden_dst, &a->whlist, a->btgt, dir,
+					  dentry->d_inode);
+			if (unlikely(err))
+				Warn("failed removing whtmp dir %.*s (%d), "
+				     "ignored.\n", DLNPair(hidden_dst), err);
+		} else {
+			kick_rmdir_whtmp(hidden_dst, &a->whlist, a->btgt, dir,
+					 dentry->d_inode, tharg);
+			dput(hidden_dst);
+			tharg = NULL;
+		}
+	}
+	err = 0;
+	goto out_success;
+
+#define RevertFailure(fmt, args...) do { \
+		IOErrWhck("revert failure: " fmt " (%d, %d)\n", \
+			##args, err, rerr); \
+		err = -EIO; \
+	} while(0)
+
+ out_diropq:
+	if (need_diropq) {
+		struct inode *h_inode;
+
+		h_inode = au_h_dptr_i(src_dentry, a->btgt)->d_inode;
+		// i_lock simplly since inotify is not set to h_inode.
+		hi_lock_parent(h_inode);
+		//hdir_lock(h_inode, src_dentry->d_inode, a->btgt);
+		rerr = remove_diropq(src_dentry, a->btgt, a->dlgt);
+		//rerr = -1;
+		//hdir_unlock(h_inode, src_dentry->d_inode, a->btgt);
+		i_unlock(h_inode);
+		if (rerr)
+			RevertFailure("remove diropq %.*s",
+				      DLNPair(src_dentry));
+	}
+ out_rename:
+	if (!bycpup) {
+		struct dentry *d;
+		struct qstr *name = &src_dentry->d_name;
+		d = lkup_one(name->name, a->hidden_parent[SRC], name->len,
+			     &lkup);
+		//d = ERR_PTR(-1);
+		rerr = PTR_ERR(d);
+		if (IS_ERR(d)) {
+			RevertFailure("lkup_one %.*s", DLNPair(src_dentry));
+			goto out_whtmp;
+		}
+		DEBUG_ON(d->d_inode);
+		rerr = vfsub_rename
+			(hidden_dir[DST], au_h_dptr_i(src_dentry, a->btgt),
+			 hidden_dir[SRC], d, a->dlgt);
+		//rerr = -1;
+		d_drop(d);
+		dput(d);
+		//set_h_dptr(src_dentry, a->btgt, NULL);
+		if (rerr)
+			RevertFailure("rename %.*s", DLNPair(src_dentry));
+	} else {
+		rerr = vfsub_unlink(hidden_dir[DST], a->hidden_dentry[DST],
+				    a->dlgt);
+		//rerr = -1;
+		set_h_dptr(src_dentry, a->btgt, NULL);
+		set_dbstart(src_dentry, a->bstart[SRC]);
+		if (rerr)
+			RevertFailure("unlink %.*s",
+				      DLNPair(a->hidden_dentry[DST]));
+	}
+ out_whtmp:
+	if (tharg) {
+		struct dentry *d;
+		struct qstr *name = &dentry->d_name;
+		LKTRLabel(here);
+		d = lkup_one(name->name, a->hidden_parent[DST], name->len,
+			     &lkup);
+		//d = ERR_PTR(-1);
+		rerr = PTR_ERR(d);
+		if (IS_ERR(d)) {
+			RevertFailure("lookup %.*s", LNPair(name));
+			goto out_whdst;
+		}
+		if (d->d_inode) {
+			d_drop(d);
+			dput(d);
+			goto out_whdst;
+		}
+		DEBUG_ON(d->d_inode);
+		rerr = vfsub_rename(hidden_dir[DST], hidden_dst,
+				    hidden_dir[DST], d, a->dlgt);
+		//rerr = -1;
+		d_drop(d);
+		dput(d);
+		if (rerr) {
+			RevertFailure("rename %.*s", DLNPair(hidden_dst));
+			goto out_whdst;
+		}
+		set_h_dptr(dentry, a->btgt, NULL);
+		set_h_dptr(dentry, a->btgt, dget(hidden_dst));
+	}
+ out_whdst:
+	dput(wh_dentry[DST]);
+	wh_dentry[DST] = NULL;
+ out_whsrc:
+	if (wh_dentry[SRC]) {
+		LKTRLabel(here);
+		rerr = au_unlink_wh_dentry(hidden_dir[SRC], wh_dentry[SRC],
+					   src_dentry, a->dlgt);
+		//rerr = -1;
+		if (rerr)
+			RevertFailure("unlink %.*s", DLNPair(wh_dentry[SRC]));
+	}
+#undef RevertFailure
+	d_drop(src_dentry);
+	bend = dbend(src_dentry);
+	for (bindex = dbstart(src_dentry); bindex <= bend; bindex++) {
+		struct dentry *hd;
+		hd = au_h_dptr_i(src_dentry, bindex);
+		if (hd)
+			d_drop(hd);
+	}
+	d_drop(dentry);
+	bend = dbend(dentry);
+	for (bindex = dbstart(dentry); bindex <= bend; bindex++) {
+		struct dentry *hd;
+		hd = au_h_dptr_i(dentry, bindex);
+		if (hd)
+			d_drop(hd);
+	}
+	au_update_dbstart(dentry);
+	if (tharg)
+		d_drop(hidden_dst);
+ out_success:
+	dput(wh_dentry[SRC]);
+	dput(wh_dentry[DST]);
+ out_tharg:
+	if (tharg) {
+		dput(hidden_dst);
+		kfree(tharg);
+	}
+ out:
+	TraceErr(err);
+	return err;
+}
+
+/*
+ * test if @dentry dir can be rename destination or not.
+ * success means, it is a logically empty dir.
+ */
+static int may_rename_dstdir(struct dentry *dentry, aufs_bindex_t btgt,
+			     struct aufs_nhash *whlist)
+{
+	LKTRTrace("%.*s\n", DLNPair(dentry));
+
+	return test_empty(dentry, whlist);
+}
+
+/*
+ * test if @dentry dir can be rename source or not.
+ * if it can, return 0 and @children is filled.
+ * success means,
+ * - or, it is a logically empty dir.
+ * - or, it exists on writable branch and has no children including whiteouts
+ *       on the lower branch.
+ */
+static int may_rename_srcdir(struct dentry *dentry, aufs_bindex_t btgt)
+{
+	int err;
+	aufs_bindex_t bstart;
+
+	LKTRTrace("%.*s\n", DLNPair(dentry));
+
+	bstart = dbstart(dentry);
+	if (bstart != btgt) {
+		struct aufs_nhash *whlist;
+
+		whlist = nhash_new(GFP_KERNEL);
+		err = PTR_ERR(whlist);
+		if (IS_ERR(whlist))
+			goto out;
+		err = test_empty(dentry, whlist);
+		nhash_del(whlist);
+		goto out;
+	}
+
+	if (bstart == dbtaildir(dentry))
+		return 0; /* success */
+
+	err = au_test_empty_lower(dentry);
+
+ out:
+	if (/* unlikely */(err == -ENOTEMPTY))
+		err = -EXDEV;
+	TraceErr(err);
+	return err;
+}
+
+int aufs_rename(struct inode *src_dir, struct dentry *src_dentry,
+		struct inode *dir, struct dentry *dentry)
+{
+	int err, do_dt_dstdir;
+	aufs_bindex_t bend, bindex;
+	struct inode *inode, *dirs[2];
+	enum {PARENT, CHILD};
+	/* reduce stack space */
+	struct {
+		struct rename_args a;
+		struct dtime dt[2][2];
+	} *p;
+
+	LKTRTrace("i%lu, %.*s, i%lu, %.*s\n",
+		  src_dir->i_ino, DLNPair(src_dentry),
+		  dir->i_ino, DLNPair(dentry));
+	IMustLock(src_dir);
+	IMustLock(dir);
+	/* braces are added to stop a warning */
+	if (dentry->d_inode) {
+		IMustLock(dentry->d_inode);
+	}
+
+	err = -ENOMEM;
+	BUILD_BUG_ON(sizeof(*p) > PAGE_SIZE);
+	p = kmalloc(sizeof(*p), GFP_KERNEL);
+	if (unlikely(!p))
+		goto out;
+
+	err = -ENOTDIR;
+	p->a.sb = src_dentry->d_sb;
+	inode = src_dentry->d_inode;
+	p->a.isdir = !!S_ISDIR(inode->i_mode);
+	if (unlikely(p->a.isdir && dentry->d_inode
+		     && !S_ISDIR(dentry->d_inode->i_mode)))
+		goto out_free;
+
+	aufs_read_and_write_lock2(dentry, src_dentry, p->a.isdir);
+	p->a.dlgt = !!need_dlgt(p->a.sb);
+	p->a.parent[SRC] = p->a.parent[DST] = dentry->d_parent;
+	p->a.issamedir = (src_dir == dir);
+	if (p->a.issamedir)
+		di_write_lock_parent(p->a.parent[DST]);
+	else {
+		p->a.parent[SRC] = src_dentry->d_parent;
+		di_write_lock2_parent(p->a.parent[SRC], p->a.parent[DST],
+				      /*isdir*/1);
+	}
+
+	/* which branch we process */
+	p->a.bstart[DST] = dbstart(dentry);
+	p->a.btgt = err = wr_dir(dentry, 1, src_dentry, /*force_btgt*/-1,
+			      /*do_lock_srcdir*/0);
+	if (unlikely(err < 0))
+		goto out_unlock;
+
+	/* are they available to be renamed */
+	err = 0;
+	nhash_init(&p->a.whlist);
+	if (p->a.isdir && dentry->d_inode) {
+		set_dbstart(dentry, p->a.bstart[DST]);
+		err = may_rename_dstdir(dentry, p->a.btgt, &p->a.whlist);
+		set_dbstart(dentry, p->a.btgt);
+	}
+	p->a.hidden_dentry[DST] = au_h_dptr(dentry);
+	if (unlikely(err))
+		goto out_unlock;
+	//todo: minor optimize, their sb may be same while their bindex differs.
+	p->a.bstart[SRC] = dbstart(src_dentry);
+	p->a.hidden_dentry[SRC] = au_h_dptr(src_dentry);
+	if (p->a.isdir) {
+		err = may_rename_srcdir(src_dentry, p->a.btgt);
+		if (unlikely(err))
+			goto out_children;
+	}
+
+	/* prepare the writable parent dir on the same branch */
+	err = wr_dir_need_wh(src_dentry, p->a.isdir, &p->a.btgt,
+			     p->a.issamedir ? NULL : p->a.parent[DST]);
+	if (unlikely(err < 0))
+		goto out_children;
+	p->a.whsrc = !!err;
+	p->a.whdst = (p->a.bstart[DST] == p->a.btgt);
+	if (!p->a.whdst) {
+		err = cpup_dirs(dentry, p->a.btgt,
+				p->a.issamedir ? NULL : p->a.parent[SRC]);
+		if (unlikely(err))
+			goto out_children;
+	}
+
+	p->a.hidden_parent[SRC] = au_h_dptr_i(p->a.parent[SRC], p->a.btgt);
+	p->a.hidden_parent[DST] = au_h_dptr_i(p->a.parent[DST], p->a.btgt);
+	dirs[0] = src_dir;
+	dirs[1] = dir;
+	hdir_lock_rename(p->a.hidden_parent, dirs, p->a.btgt, p->a.issamedir);
+
+	/* store timestamps to be revertible */
+	dtime_store(p->dt[PARENT] + SRC, p->a.parent[SRC],
+		    p->a.hidden_parent[SRC]);
+	if (!p->a.issamedir)
+		dtime_store(p->dt[PARENT] + DST, p->a.parent[DST],
+			    p->a.hidden_parent[DST]);
+	do_dt_dstdir = 0;
+	if (p->a.isdir) {
+		dtime_store(p->dt[CHILD] + SRC, src_dentry,
+			    p->a.hidden_dentry[SRC]);
+		if (p->a.hidden_dentry[DST]->d_inode) {
+			do_dt_dstdir = 1;
+			dtime_store(p->dt[CHILD] + DST, dentry,
+				    p->a.hidden_dentry[DST]);
+		}
+	}
+
+	err = do_rename(src_dir, src_dentry, dir, dentry, &p->a);
+	if (unlikely(err))
+		goto out_dt;
+	hdir_unlock_rename(p->a.hidden_parent, dirs, p->a.btgt, p->a.issamedir);
+
+	/* update dir attributes */
+	dir->i_version++;
+	if (p->a.isdir)
+		au_cpup_attr_nlink(dir);
+	if (ibstart(dir) == p->a.btgt)
+		au_cpup_attr_timesizes(dir);
+
+	if (!p->a.issamedir) {
+		src_dir->i_version++;
+		if (p->a.isdir)
+			au_cpup_attr_nlink(src_dir);
+		if (ibstart(src_dir) == p->a.btgt)
+			au_cpup_attr_timesizes(src_dir);
+	}
+
+	// is this updating defined in POSIX?
+	if (unlikely(p->a.isdir)) {
+		//i_lock(inode);
+		au_cpup_attr_timesizes(inode);
+		//i_unlock(inode);
+	}
+
+#if 0
+	d_drop(src_dentry);
+#else
+	/* dput/iput all lower dentries */
+	set_dbwh(src_dentry, -1);
+	bend = dbend(src_dentry);
+	for (bindex = p->a.btgt + 1; bindex <= bend; bindex++) {
+		struct dentry *hd;
+		hd = au_h_dptr_i(src_dentry, bindex);
+		if (hd)
+			set_h_dptr(src_dentry, bindex, NULL);
+	}
+	set_dbend(src_dentry, p->a.btgt);
+
+	bend = ibend(inode);
+	for (bindex = p->a.btgt + 1; bindex <= bend; bindex++) {
+		struct inode *hi;
+		hi = au_h_iptr_i(inode, bindex);
+		if (hi)
+			set_h_iptr(inode, bindex, NULL, 0);
+	}
+	set_ibend(inode, p->a.btgt);
+#endif
+
+#if 0
+	//au_debug_on();
+	//DbgDentry(dentry);
+	//DbgInode(dentry->d_inode);
+	//au_debug_off();
+	inode = dentry->d_inode;
+	if (inode) {
+		aufs_bindex_t bindex, bend;
+		struct dentry *hd;
+		bend = dbend(dentry);
+		for (bindex = dbstart(dentry); bindex <= bend; bindex++) {
+			hd = au_h_dptr_i(dentry, bindex);
+			if (hd && hd->d_inode)
+				xino_write0(p->a.sb, bindex, hd->d_inode->i_ino);
+			/* ignore this error */
+		}
+	}
+#endif
+
+	goto out_children; /* success */
+
+ out_dt:
+	dtime_revert(p->dt[PARENT] + SRC,
+		     p->a.hidden_parent[SRC]->d_parent
+		     == p->a.hidden_parent[DST]);
+	if (!p->a.issamedir)
+		dtime_revert(p->dt[PARENT] + DST,
+			     p->a.hidden_parent[DST]->d_parent
+			     == p->a.hidden_parent[SRC]);
+	if (p->a.isdir && err != -EIO) {
+		struct dentry *hd;
+
+		hd = p->dt[CHILD][SRC].dt_h_dentry;
+		hi_lock_child(hd->d_inode);
+		dtime_revert(p->dt[CHILD] + SRC, 1);
+		i_unlock(hd->d_inode);
+		if (do_dt_dstdir) {
+			hd = p->dt[CHILD][DST].dt_h_dentry;
+			hi_lock_child(hd->d_inode);
+			dtime_revert(p->dt[CHILD] + DST, 1);
+			i_unlock(hd->d_inode);
+		}
+	}
+	hdir_unlock_rename(p->a.hidden_parent, dirs, p->a.btgt, p->a.issamedir);
+ out_children:
+	nhash_fin(&p->a.whlist);
+ out_unlock:
+	//if (unlikely(err /* && p->a.isdir */)) {
+	if (unlikely(err && p->a.isdir)) {
+		au_update_dbstart(dentry);
+		d_drop(dentry);
+	}
+	if (p->a.issamedir)
+		di_write_unlock(p->a.parent[DST]);
+	else
+		di_write_unlock2(p->a.parent[SRC], p->a.parent[DST]);
+	aufs_read_and_write_unlock2(dentry, src_dentry);
+ out_free:
+	kfree(p);
+ out:
+	TraceErr(err);
+	return err;
+}
diff --git a/fs/aufs/iinfo.c b/fs/aufs/iinfo.c
new file mode 100755
index 0000000..9efbd38
--- /dev/null
+++ b/fs/aufs/iinfo.c
@@ -0,0 +1,286 @@
+/*
+ * Copyright (C) 2005, 2006, 2007 Junjiro Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+/* $Id: iinfo.c,v 1.31 2007/05/14 03:41:52 sfjro Exp $ */
+
+//#include <linux/mm.h>
+#include "aufs.h"
+
+struct aufs_iinfo *itoii(struct inode *inode)
+{
+	struct aufs_iinfo *iinfo;
+
+	iinfo = &(container_of(inode, struct aufs_icntnr, vfs_inode)->iinfo);
+	/* bad_inode case */
+	if (unlikely(!iinfo->ii_hinode))
+		return NULL;
+	DEBUG_ON(!iinfo->ii_hinode
+		 /* || stosi(inode->i_sb)->si_bend < iinfo->ii_bend */
+		 || iinfo->ii_bend < iinfo->ii_bstart);
+	return iinfo;
+}
+
+aufs_bindex_t ibstart(struct inode *inode)
+{
+	IiMustAnyLock(inode);
+	return itoii(inode)->ii_bstart;
+}
+
+aufs_bindex_t ibend(struct inode *inode)
+{
+	IiMustAnyLock(inode);
+	return itoii(inode)->ii_bend;
+}
+
+struct aufs_vdir *ivdir(struct inode *inode)
+{
+	IiMustAnyLock(inode);
+	DEBUG_ON(!S_ISDIR(inode->i_mode));
+	return itoii(inode)->ii_vdir;
+}
+
+struct inode *au_h_iptr_i(struct inode *inode, aufs_bindex_t bindex)
+{
+	struct inode *hidden_inode;
+
+	IiMustAnyLock(inode);
+	DEBUG_ON(bindex < 0 || ibend(inode) < bindex);
+	hidden_inode = itoii(inode)->ii_hinode[0 + bindex].hi_inode;
+	DEBUG_ON(hidden_inode && atomic_read(&hidden_inode->i_count) <= 0);
+	return hidden_inode;
+}
+
+struct inode *au_h_iptr(struct inode *inode)
+{
+	return au_h_iptr_i(inode, ibstart(inode));
+}
+
+aufs_bindex_t itoid_index(struct inode *inode, aufs_bindex_t bindex)
+{
+	IiMustAnyLock(inode);
+	DEBUG_ON(bindex < 0
+		 || ibend(inode) < bindex
+		 || !itoii(inode)->ii_hinode[0 + bindex].hi_inode);
+	return itoii(inode)->ii_hinode[0 + bindex].hi_id;
+}
+
+// hard/soft set
+void set_ibstart(struct inode *inode, aufs_bindex_t bindex)
+{
+	struct aufs_iinfo *iinfo = itoii(inode);
+	struct inode *h_inode;
+
+	IiMustWriteLock(inode);
+	DEBUG_ON(sbend(inode->i_sb) < bindex);
+	iinfo->ii_bstart = bindex;
+	h_inode = iinfo->ii_hinode[bindex + 0].hi_inode;
+	if (h_inode)
+		au_cpup_igen(inode, h_inode);
+}
+
+void set_ibend(struct inode *inode, aufs_bindex_t bindex)
+{
+	IiMustWriteLock(inode);
+	DEBUG_ON(sbend(inode->i_sb) < bindex
+		 || bindex < ibstart(inode));
+	itoii(inode)->ii_bend = bindex;
+}
+
+void set_ivdir(struct inode *inode, struct aufs_vdir *vdir)
+{
+	IiMustWriteLock(inode);
+	DEBUG_ON(!S_ISDIR(inode->i_mode)
+		 || (itoii(inode)->ii_vdir && vdir));
+	itoii(inode)->ii_vdir = vdir;
+}
+
+void aufs_hiput(struct aufs_hinode *hinode)
+{
+	if (unlikely(hinode->hi_notify))
+		do_free_hinotify(hinode);
+	if (hinode->hi_inode)
+		iput(hinode->hi_inode);
+}
+
+unsigned int au_hi_flags(struct inode *inode, int isdir)
+{
+	unsigned int flags;
+	struct super_block *sb = inode->i_sb;
+
+	flags = 0;
+	if (au_flag_test(sb, AuFlag_XINO))
+		flags = AUFS_HI_XINO;
+	if (unlikely(isdir && au_flag_test(sb, AuFlag_UDBA_INOTIFY)))
+		flags |= AUFS_HI_NOTIFY;
+	return flags;
+}
+
+void set_h_iptr(struct inode *inode, aufs_bindex_t bindex,
+		struct inode *h_inode, unsigned int flags)
+{
+	struct aufs_hinode *hinode;
+	struct inode *hi;
+	struct aufs_iinfo *iinfo = itoii(inode);
+
+	LKTRTrace("i%lu, b%d, hi%lu, flags 0x%x\n",
+		  inode->i_ino, bindex, h_inode ? h_inode->i_ino : 0, flags);
+	IiMustWriteLock(inode);
+	hinode = iinfo->ii_hinode + bindex;
+	hi = hinode->hi_inode;
+	DEBUG_ON(bindex < ibstart(inode) || ibend(inode) < bindex
+		 || (h_inode && atomic_read(&h_inode->i_count) <= 0)
+		 || (h_inode && hi));
+
+	if (hi)
+		aufs_hiput(hinode);
+	hinode->hi_inode = h_inode;
+	if (h_inode) {
+		int err;
+		struct super_block *sb = inode->i_sb;
+
+		if (bindex == iinfo->ii_bstart)
+			au_cpup_igen(inode, h_inode);
+		hinode->hi_id = sbr_id(sb, bindex);
+		if (flags & AUFS_HI_XINO) {
+			struct xino xino = {
+				.ino	= inode->i_ino,
+				//.h_gen	= h_inode->i_generation
+			};
+			//WARN_ON(xino.h_gen == AuXino_INVALID_HGEN);
+			err = xino_write(sb, bindex, h_inode->i_ino, &xino);
+			if (unlikely(err)) {
+				IOErr1("failed xino_write() %d, force noxino\n",
+				       err);
+				au_flag_clr(sb, AuFlag_XINO);
+			}
+		}
+		if (flags & AUFS_HI_NOTIFY) {
+			err = alloc_hinotify(hinode, inode, h_inode);
+			if (unlikely(err))
+				IOErr1("alloc_hinotify() %d\n", err);
+			else {
+				/* braces are added to stop a warning */
+				DEBUG_ON(!hinode->hi_notify);
+			}
+		}
+	}
+}
+
+void au_update_iigen(struct inode *inode)
+{
+	//IiMustWriteLock(inode);
+	DEBUG_ON(!inode->i_sb);
+	atomic_set(&itoii(inode)->ii_generation, au_sigen(inode->i_sb));
+}
+
+/* it may be called at remount time, too */
+void au_update_brange(struct inode *inode, int do_put_zero)
+{
+	struct aufs_iinfo *iinfo;
+
+	LKTRTrace("i%lu, %d\n", inode->i_ino, do_put_zero);
+	IiMustWriteLock(inode);
+
+	iinfo = itoii(inode);
+	if (unlikely(!iinfo) || iinfo->ii_bstart < 0)
+		return;
+
+	if (do_put_zero) {
+		aufs_bindex_t bindex;
+		for (bindex = iinfo->ii_bstart; bindex <= iinfo->ii_bend;
+		     bindex++) {
+			struct inode *h_i;
+			h_i = iinfo->ii_hinode[0 + bindex].hi_inode;
+			if (h_i && !h_i->i_nlink)
+				set_h_iptr(inode, bindex, NULL, 0);
+		}
+	}
+
+	iinfo->ii_bstart = -1;
+	while (++iinfo->ii_bstart <= iinfo->ii_bend)
+		if (iinfo->ii_hinode[0 + iinfo->ii_bstart].hi_inode)
+			break;
+	if (iinfo->ii_bstart > iinfo->ii_bend) {
+		iinfo->ii_bend = iinfo->ii_bstart = -1;
+		return;
+	}
+
+	iinfo->ii_bend++;
+	while (0 <= --iinfo->ii_bend)
+		if (iinfo->ii_hinode[0 + iinfo->ii_bend].hi_inode)
+			break;
+}
+
+/* ---------------------------------------------------------------------- */
+
+int au_iinfo_init(struct inode *inode)
+{
+	struct aufs_iinfo *iinfo;
+	struct super_block *sb;
+	int nbr, i;
+
+	sb = inode->i_sb;
+	DEBUG_ON(!sb);
+	iinfo = &(container_of(inode, struct aufs_icntnr, vfs_inode)->iinfo);
+	DEBUG_ON(iinfo->ii_hinode);
+	nbr = sbend(sb) + 1;
+	if (unlikely(!nbr))
+		nbr++;
+	iinfo->ii_hinode = kcalloc(nbr, sizeof(*iinfo->ii_hinode), GFP_KERNEL);
+	//iinfo->ii_hinode = NULL;
+	if (iinfo->ii_hinode) {
+		for (i = 0; i < nbr; i++)
+			iinfo->ii_hinode[i].hi_id = -1;
+		atomic_set(&iinfo->ii_generation, au_sigen(sb));
+		rw_init_nolock(&iinfo->ii_rwsem);
+		iinfo->ii_bstart = -1;
+		iinfo->ii_bend = -1;
+		iinfo->ii_vdir = NULL;
+		return 0;
+	}
+	return -ENOMEM;
+}
+
+void au_iinfo_fin(struct inode *inode)
+{
+	struct aufs_iinfo *iinfo;
+
+	iinfo = itoii(inode);
+	/* bad_inode case */
+	if (unlikely(!iinfo))
+		return;
+
+	if (unlikely(iinfo->ii_vdir))
+		free_vdir(iinfo->ii_vdir);
+
+	if (iinfo->ii_bstart >= 0) {
+		aufs_bindex_t bend;
+		struct aufs_hinode *hi;
+		hi = iinfo->ii_hinode + iinfo->ii_bstart;
+		bend = iinfo->ii_bend;
+		while (iinfo->ii_bstart++ <= bend) {
+			if (hi->hi_inode)
+				aufs_hiput(hi);
+			hi++;
+		}
+		//iinfo->ii_bstart = iinfo->ii_bend = -1;
+	}
+
+	kfree(iinfo->ii_hinode);
+	//iinfo->ii_hinode = NULL;
+}
diff --git a/fs/aufs/inode.c b/fs/aufs/inode.c
new file mode 100755
index 0000000..f18b5d8
--- /dev/null
+++ b/fs/aufs/inode.c
@@ -0,0 +1,339 @@
+/*
+ * Copyright (C) 2005, 2006, 2007 Junjiro Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+/* $Id: inode.c,v 1.22 2007/05/07 03:44:35 sfjro Exp $ */
+
+#include "aufs.h"
+
+int au_refresh_hinode(struct inode *inode, struct dentry *dentry)
+{
+	int err, new_sz, update, isdir;
+	struct inode *first;
+	struct aufs_hinode *p, *q, tmp;
+	struct super_block *sb;
+	struct aufs_iinfo *iinfo;
+	aufs_bindex_t bindex, bend, new_bindex;
+	unsigned int flags;
+
+	LKTRTrace("%.*s\n", DLNPair(dentry));
+	IiMustWriteLock(inode);
+
+	err = -ENOMEM;
+	sb = dentry->d_sb;
+	bend = sbend(sb);
+	new_sz = sizeof(*iinfo->ii_hinode) * (bend + 1);
+	iinfo = itoii(inode);
+	p = au_kzrealloc(iinfo->ii_hinode, sizeof(*p) * (iinfo->ii_bend + 1),
+			 new_sz, GFP_KERNEL);
+	//p = NULL;
+	if (unlikely(!p))
+		goto out;
+
+	iinfo->ii_hinode = p;
+	err = 0;
+	update = 0;
+	p = iinfo->ii_hinode + iinfo->ii_bstart;
+	first = p->hi_inode;
+	for (bindex = iinfo->ii_bstart; bindex <= iinfo->ii_bend;
+	     bindex++, p++) {
+		if (unlikely(!p->hi_inode))
+			continue;
+
+		new_bindex = find_brindex(sb, p->hi_id);
+		if (new_bindex == bindex)
+			continue;
+		if (new_bindex < 0) {
+			update++;
+			aufs_hiput(p);
+			p->hi_inode = NULL;
+			continue;
+		}
+
+		if (new_bindex < iinfo->ii_bstart)
+			iinfo->ii_bstart = new_bindex;
+		if (iinfo->ii_bend < new_bindex)
+			iinfo->ii_bend = new_bindex;
+		/* swap two hidden inode, and loop again */
+		q = iinfo->ii_hinode + new_bindex;
+		tmp = *q;
+		*q = *p;
+		*p = tmp;
+		if (tmp.hi_inode) {
+			bindex--;
+			p--;
+		}
+	}
+
+	isdir = S_ISDIR(inode->i_mode);
+	flags = au_hi_flags(inode, isdir);
+	bend = dbend(dentry);
+	for (bindex = dbstart(dentry); bindex <= bend; bindex++) {
+		struct inode *hi;
+		struct dentry *hd;
+
+		hd = au_h_dptr_i(dentry, bindex);
+		if (!hd || !hd->d_inode)
+			continue;
+
+		if (iinfo->ii_bstart <= bindex && bindex <= iinfo->ii_bend) {
+			hi = au_h_iptr_i(inode, bindex);
+			if (hi) {
+				if (hi == hd->d_inode)
+					continue;
+				//Dbg("here\n");
+				err = -ESTALE;
+				break;
+			}
+		}
+		if (bindex < iinfo->ii_bstart)
+			iinfo->ii_bstart = bindex;
+		if (iinfo->ii_bend < bindex)
+			iinfo->ii_bend = bindex;
+		set_h_iptr(inode, bindex, igrab(hd->d_inode), flags);
+		update++;
+	}
+
+	bend = iinfo->ii_bend;
+	p = iinfo->ii_hinode;
+	for (bindex = 0; bindex <= bend; bindex++, p++)
+		if (p->hi_inode) {
+			iinfo->ii_bstart = bindex;
+			break;
+		}
+	p = iinfo->ii_hinode + bend;
+	for (bindex = bend; bindex > iinfo->ii_bstart; bindex--, p--)
+		if (p->hi_inode) {
+			iinfo->ii_bend = bindex;
+			break;
+		}
+	DEBUG_ON(iinfo->ii_bstart > bend || iinfo->ii_bend < 0);
+
+	if (unlikely(err))
+		goto out;
+
+	if (1 || first != au_h_iptr(inode))
+		au_cpup_attr_all(inode);
+	if (update && isdir)
+		inode->i_version++;
+	au_update_iigen(inode);
+
+ out:
+	//au_debug_on();
+	TraceErr(err);
+	//au_debug_off();
+	return err;
+}
+
+static int set_inode(struct inode *inode, struct dentry *dentry)
+{
+	int err, isdir;
+	struct dentry *hidden_dentry;
+	struct inode *hidden_inode;
+	umode_t mode;
+	aufs_bindex_t bindex, bstart, btail;
+	struct aufs_iinfo *iinfo;
+	unsigned int flags;
+
+	LKTRTrace("i%lu, %.*s\n", inode->i_ino, DLNPair(dentry));
+	DEBUG_ON(!(inode->i_state & I_NEW));
+	IiMustWriteLock(inode);
+	hidden_dentry = au_h_dptr(dentry);
+	DEBUG_ON(!hidden_dentry);
+	hidden_inode = hidden_dentry->d_inode;
+	DEBUG_ON(!hidden_inode);
+
+	err = 0;
+	isdir = 0;
+	bstart = dbstart(dentry);
+	mode = hidden_inode->i_mode;
+	switch (mode & S_IFMT) {
+	case S_IFREG:
+		btail = dbtail(dentry);
+		break;
+	case S_IFDIR:
+		isdir = 1;
+		btail = dbtaildir(dentry);
+		inode->i_op = &aufs_dir_iop;
+		inode->i_fop = &aufs_dir_fop;
+		break;
+	case S_IFLNK:
+		btail = dbtail(dentry);
+		inode->i_op = &aufs_symlink_iop;
+		break;
+	case S_IFBLK:
+	case S_IFCHR:
+	case S_IFIFO:
+	case S_IFSOCK:
+		btail = dbtail(dentry);
+		init_special_inode(inode, mode, hidden_inode->i_rdev);
+		break;
+	default:
+		IOErr("Unknown file type 0%o\n", mode);
+		err = -EIO;
+		goto out;
+	}
+
+	flags = au_hi_flags(inode, isdir);
+	iinfo = itoii(inode);
+	iinfo->ii_bstart = bstart;
+	iinfo->ii_bend = btail;
+	for (bindex = bstart; bindex <= btail; bindex++) {
+		hidden_dentry = au_h_dptr_i(dentry, bindex);
+		if (!hidden_dentry)
+			continue;
+		DEBUG_ON(!hidden_dentry->d_inode);
+		set_h_iptr(inode, bindex, igrab(hidden_dentry->d_inode), flags);
+	}
+	au_cpup_attr_all(inode);
+
+ out:
+	TraceErr(err);
+	return err;
+}
+
+/* successful returns with iinfo write_locked */
+//todo: return with unlocked?
+static int reval_inode(struct inode *inode, struct dentry *dentry, int *matched)
+{
+	int err;
+	struct inode *h_inode, *h_dinode;
+	aufs_bindex_t bindex, bend;
+	//const int udba = !au_flag_test(inode->i_sb, AuFlag_UDBA_NONE);
+
+	LKTRTrace("i%lu, %.*s\n", inode->i_ino, DLNPair(dentry));
+
+	*matched = 0;
+
+	/*
+	 * before this function, if aufs got any iinfo lock, it must be only
+	 * one, the parent dir.
+	 * it can happen by UDBA and the obsoleted inode number.
+	 */
+	err = -EIO;
+	if (unlikely(inode->i_ino == parent_ino(dentry)))
+		goto out;
+
+	h_dinode = au_h_dptr(dentry)->d_inode;
+	hi_lock_child(inode);	// bad name, this is not a hidden inode.
+	ii_write_lock_new(inode);
+	bend = ibend(inode);
+	for (bindex = ibstart(inode); bindex <= bend; bindex++) {
+		h_inode = au_h_iptr_i(inode, bindex);
+		if (h_inode && h_inode == h_dinode) {
+			//&& (ibs != bstart || !au_test_higen(inode, h_inode)));
+			*matched = 1;
+			err = 0;
+			if (unlikely(au_iigen(inode) != au_digen(dentry)))
+				err = au_refresh_hinode(inode, dentry);
+			break;
+		}
+	}
+	i_unlock(inode);
+	if (unlikely(err))
+		ii_write_unlock(inode);
+
+ out:
+	TraceErr(err);
+	return err;
+}
+
+/* successful returns with iinfo write_locked */
+//todo: return with unlocked?
+struct inode *au_new_inode(struct dentry *dentry)
+{
+	struct inode *inode, *h_inode;
+	struct dentry *h_dentry;
+	ino_t h_ino;
+	struct super_block *sb;
+	int err, match;
+	aufs_bindex_t bstart;
+	struct xino xino;
+
+	LKTRTrace("%.*s\n", DLNPair(dentry));
+	sb = dentry->d_sb;
+	h_dentry = au_h_dptr(dentry);
+	DEBUG_ON(!h_dentry);
+	h_inode = h_dentry->d_inode;
+	DEBUG_ON(!h_inode);
+
+	bstart = dbstart(dentry);
+	h_ino = h_inode->i_ino;
+	err = xino_read(sb, bstart, h_ino, &xino);
+	//err = -1;
+	inode = ERR_PTR(err);
+	if (unlikely(err))
+		goto out;
+ new_ino:
+	if (!xino.ino) {
+		xino.ino = xino_new_ino(sb);
+		if (!xino.ino) {
+			inode = ERR_PTR(-EIO);
+			goto out;
+		}
+	}
+
+	LKTRTrace("i%lu\n", xino.ino);
+	err = -ENOMEM;
+	inode = iget_locked(sb, xino.ino);
+	if (unlikely(!inode))
+		goto out;
+	err = PTR_ERR(inode);
+	if (IS_ERR(inode))
+		goto out;
+	err = -ENOMEM;
+	if (unlikely(is_bad_inode(inode)))
+		goto out_iput;
+
+	LKTRTrace("%lx, new %d\n", inode->i_state, !!(inode->i_state & I_NEW));
+	if (inode->i_state & I_NEW) {
+		sb->s_op->read_inode(inode);
+		if (!is_bad_inode(inode)) {
+			ii_write_lock_new(inode);
+			err = set_inode(inode, dentry);
+			//err = -1;
+		}
+		unlock_new_inode(inode);
+		if (!err)
+			goto out; /* success */
+		ii_write_unlock(inode);
+		goto out_iput;
+	} else {
+		err = reval_inode(inode, dentry, &match);
+		if (!err)
+			goto out; /* success */
+		else if (match)
+			goto out_iput;
+	}
+
+	Warn1("broken ino, b%d, %.*s/%.*s, hi%lu, i%lu. Try udba=inotify.\n",
+	      bstart, DLNPair(dentry->d_parent), DLNPair(dentry), h_ino,
+	      xino.ino);
+	xino.ino = 0;
+	err = xino_write0(sb, bstart, h_ino);
+	if (!err) {
+		iput(inode);
+		goto new_ino;
+	}
+
+ out_iput:
+	iput(inode);
+	inode = ERR_PTR(err);
+ out:
+	TraceErrPtr(inode);
+	return inode;
+}
diff --git a/fs/aufs/inode.h b/fs/aufs/inode.h
new file mode 100755
index 0000000..b001ac3
--- /dev/null
+++ b/fs/aufs/inode.h
@@ -0,0 +1,377 @@
+/*
+ * Copyright (C) 2005, 2006, 2007 Junjiro Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+/* $Id: inode.h,v 1.32 2007/05/14 03:41:52 sfjro Exp $ */
+
+#ifndef __AUFS_INODE_H__
+#define __AUFS_INODE_H__
+
+#ifdef __KERNEL__
+
+#include <linux/fs.h>
+#include <linux/inotify.h>
+#include <linux/version.h>
+#include <linux/aufs_type.h>
+#include "misc.h"
+#include "vfsub.h"
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,18)
+#else
+struct inotify_watch {};
+#endif
+
+/* ---------------------------------------------------------------------- */
+
+struct aufs_hinotify {
+	struct inotify_watch	hin_watch;
+	struct inode		*hin_aufs_inode;	/* no get/put */
+};
+
+struct aufs_hinode {
+	struct inode		*hi_inode;
+	aufs_bindex_t		hi_id;
+	struct aufs_hinotify	*hi_notify;
+};
+
+struct aufs_vdir;
+struct aufs_iinfo {
+	atomic_t		ii_generation;
+	struct super_block	*ii_hsb1;	/* no get/put */
+
+	struct aufs_rwsem	ii_rwsem;
+	aufs_bindex_t		ii_bstart, ii_bend;
+	struct aufs_hinode	*ii_hinode;
+	struct aufs_vdir	*ii_vdir;
+};
+
+struct aufs_icntnr {
+	struct aufs_iinfo iinfo;
+	struct inode vfs_inode;
+};
+
+/* ---------------------------------------------------------------------- */
+
+/* inode.c */
+int au_refresh_hinode(struct inode *inode, struct dentry *dentry);
+struct inode *au_new_inode(struct dentry *dentry);
+
+/* i_op.c */
+extern struct inode_operations aufs_iop, aufs_symlink_iop, aufs_dir_iop;
+int wr_dir(struct dentry *dentry, int negative, struct dentry *src_dentry,
+	   aufs_bindex_t force_btgt, int do_lock_srcdir);
+
+/* i_op_del.c */
+int wr_dir_need_wh(struct dentry *dentry, int isdir, aufs_bindex_t *bcpup,
+		   struct dentry *locked);
+
+/* iinfo.c */
+struct aufs_iinfo *itoii(struct inode *inode);
+aufs_bindex_t ibstart(struct inode *inode);
+aufs_bindex_t ibend(struct inode *inode);
+struct aufs_vdir *ivdir(struct inode *inode);
+struct inode *au_h_iptr_i(struct inode *inode, aufs_bindex_t bindex);
+struct inode *au_h_iptr(struct inode *inode);
+aufs_bindex_t itoid_index(struct inode *inode, aufs_bindex_t bindex);
+
+void set_ibstart(struct inode *inode, aufs_bindex_t bindex);
+void set_ibend(struct inode *inode, aufs_bindex_t bindex);
+void set_ivdir(struct inode *inode, struct aufs_vdir *vdir);
+void aufs_hiput(struct aufs_hinode *hinode);
+#define AUFS_HI_XINO	1
+#define AUFS_HI_NOTIFY	2
+unsigned int au_hi_flags(struct inode *inode, int isdir);
+void set_h_iptr(struct inode *inode, aufs_bindex_t bindex,
+		struct inode *h_inode, unsigned int flags);
+void au_update_iigen(struct inode *inode);
+void au_update_brange(struct inode *inode, int do_put_zero);
+
+int au_iinfo_init(struct inode *inode);
+void au_iinfo_fin(struct inode *inode);
+
+/* plink.c */
+#ifdef CONFIG_AUFS_DEBUG
+void au_list_plink(struct super_block *sb);
+#else
+static inline void au_list_plink(struct super_block *sb)
+{
+	/* nothing */
+}
+#endif
+int au_is_plinked(struct super_block *sb, struct inode *inode);
+struct dentry *lkup_plink(struct super_block *sb, aufs_bindex_t bindex,
+			  struct inode *inode);
+void append_plink(struct super_block *sb, struct inode *inode,
+		  struct dentry *h_dentry, aufs_bindex_t bindex);
+void au_put_plink(struct super_block *sb);
+void half_refresh_plink(struct super_block *sb, aufs_bindex_t br_id);
+
+/* ---------------------------------------------------------------------- */
+
+/* lock subclass for hidden inode */
+/* default MAX_LOCKDEP_SUBCLASSES(8) is not enough */
+// todo: reduce it by dcsub.
+enum {
+	AuLsc_Begin = I_MUTEX_QUOTA,
+	AuLsc_HI_GPARENT,	/* setattr with inotify */
+	AuLsc_HI_PARENT,	/* hidden inode, parent first */
+	AuLsc_HI_CHILD,
+	AuLsc_HI_PARENT2,	/* copyup dirs */
+	AuLsc_HI_CHILD2,
+	AuLsc_End
+};
+
+/* simple abstraction */
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,16)
+static inline void i_lock(struct inode *i)
+{
+	down(&i->i_sem);
+}
+
+static inline void i_unlock(struct inode *i)
+{
+	up(&i->i_sem);
+}
+
+static inline int i_trylock(struct inode *i)
+{
+	return down_trylock(&i->i_sem);
+}
+
+static inline void hi_lock(struct inode *i, unsigned int lsc)
+{
+	i_lock(i);
+}
+
+#define IMustLock(i)	DEBUG_ON(!down_trylock(&(i)->i_sem))
+#else
+static inline void i_lock(struct inode *i)
+{
+	mutex_lock(&i->i_mutex);
+}
+
+static inline void i_unlock(struct inode *i)
+{
+	mutex_unlock(&i->i_mutex);
+}
+
+static inline int i_trylock(struct inode *i)
+{
+	return mutex_trylock(&i->i_mutex);
+}
+
+static inline void hi_lock(struct inode *i, unsigned int lsc)
+{
+	mutex_lock_nested(&i->i_mutex, lsc);
+}
+
+#define IMustLock(i)	MtxMustLock(&(i)->i_mutex)
+#endif
+
+/*
+ * hi_lock_gparent, hi_lock_parent, hi_lock_parent2, hi_lock_child,
+ * hi_lock_child2, hi_lock_whplink
+ */
+#define LockFunc(name, lsc) \
+static inline void hi_lock_##name(struct inode *h_i) \
+{hi_lock(h_i, AuLsc_HI_##lsc);}
+
+LockFunc(gparent, GPARENT);
+LockFunc(parent, PARENT);
+LockFunc(parent2, PARENT2);
+LockFunc(child, CHILD);
+LockFunc(child2, CHILD2);
+LockFunc(whplink, CHILD2);	/* sharing lock-subclass */
+
+#undef LockFunc
+
+/* ---------------------------------------------------------------------- */
+
+/* tiny test for inode number */
+/* tmpfs generation is too rough */
+static inline int au_test_higen(struct inode *inode, struct inode *h_inode)
+{
+	//IiMustAnyLock(inode);
+	return !(itoii(inode)->ii_hsb1 == h_inode->i_sb
+		 && inode->i_generation == h_inode->i_generation);
+}
+
+static inline int au_iigen(struct inode *inode)
+{
+	return atomic_read(&itoii(inode)->ii_generation);
+}
+
+#ifdef CONFIG_AUFS_HINOTIFY
+static inline void au_iigen_dec(struct inode *inode)
+{
+	//Dbg("i%lu\n", inode->i_ino);
+	atomic_dec(&itoii(inode)->ii_generation);
+}
+
+/* hinotify.c */
+int alloc_hinotify(struct aufs_hinode *hinode, struct inode *inode,
+		   struct inode *h_inode);
+void do_free_hinotify(struct aufs_hinode *hinode);
+void do_hdir_lock(struct inode *h_dir, struct inode *dir, aufs_bindex_t bindex,
+		  unsigned int lsc);
+void hdir_unlock(struct inode *h_dir, struct inode *dir, aufs_bindex_t bindex);
+void hdir_lock_rename(struct dentry **h_parents, struct inode **dirs,
+		      aufs_bindex_t bindex, int issamedir);
+void hdir_unlock_rename(struct dentry **h_parents, struct inode **dirs,
+			aufs_bindex_t bindex, int issamedir);
+void au_reset_hinotify(struct inode *inode, unsigned int flags);
+int __init au_inotify_init(void);
+void au_inotify_fin(void);
+#else
+static inline
+int alloc_hinotify(struct aufs_hinode *hinode, struct inode *inode,
+		   struct inode *h_inode)
+{
+	return -EOPNOTSUPP;
+}
+
+static inline void do_free_hinotify(struct aufs_hinode *hinode)
+{
+	/* nothing */
+}
+
+static inline
+void do_hdir_lock(struct inode *h_dir, struct inode *dir, aufs_bindex_t bindex,
+		  unsigned int lsc)
+{
+	hi_lock(h_dir, lsc);
+}
+
+static inline
+void hdir_unlock(struct inode *h_dir, struct inode *dir, aufs_bindex_t bindex)
+{
+	i_unlock(h_dir);
+}
+
+static inline
+void hdir_lock_rename(struct dentry **h_parents, struct inode **dirs,
+		      aufs_bindex_t bindex, int issamedir)
+{
+	vfsub_lock_rename(h_parents[0], h_parents[1]);
+}
+
+static inline
+void hdir_unlock_rename(struct dentry **h_parents, struct inode **dirs,
+			aufs_bindex_t bindex, int issamedir)
+{
+	vfsub_unlock_rename(h_parents[0], h_parents[1]);
+}
+
+static inline void au_reset_hinotify(struct inode *inode, unsigned int flags)
+{
+	/* nothing */
+}
+
+#define au_inotify_init()	0
+#define au_inotify_fin()	/* */
+#endif /* CONFIG_AUFS_HINOTIFY */
+
+static inline void free_hinotify(struct inode *inode, aufs_bindex_t bindex)
+{
+	do_free_hinotify(itoii(inode)->ii_hinode + bindex);
+}
+
+/*
+ * hgdir_lock, hdir_lock, hdir2_lock
+ */
+#define LockFunc(name, lsc) \
+static inline \
+void name##_lock(struct inode *h_dir, struct inode *dir, aufs_bindex_t bindex) \
+{do_hdir_lock(h_dir, dir, bindex, AuLsc_HI_##lsc);}
+
+LockFunc(hgdir, GPARENT);
+LockFunc(hdir, PARENT);
+LockFunc(hdir2, PARENT2);
+
+#undef LockFunc
+
+/* ---------------------------------------------------------------------- */
+
+/* lock subclass for iinfo */
+enum {
+	AuLsc_II_CHILD,		/* child first */
+	AuLsc_II_CHILD2,	/* rename(2), link(2), and cpup at hinotify */
+	AuLsc_II_CHILD3,	/* copyup dirs */
+	AuLsc_II_PARENT,
+	AuLsc_II_PARENT2,
+	AuLsc_II_PARENT3,
+	AuLsc_II_NEW		/* new inode */
+};
+
+/*
+ * ii_read_lock_child, ii_write_lock_child,
+ * ii_read_lock_child2, ii_write_lock_child2,
+ * ii_read_lock_child3, ii_write_lock_child3,
+ * ii_read_lock_parent, ii_write_lock_parent,
+ * ii_read_lock_parent2, ii_write_lock_parent2,
+ * ii_read_lock_parent3, ii_write_lock_parent3,
+ * ii_read_lock_new, ii_write_lock_new
+ */
+#define ReadLockFunc(name, lsc) \
+static inline void ii_read_lock_##name(struct inode *i) \
+{rw_read_lock_nested(&itoii(i)->ii_rwsem, AuLsc_II_##lsc);}
+
+#define WriteLockFunc(name, lsc) \
+static inline void ii_write_lock_##name(struct inode *i) \
+{rw_write_lock_nested(&itoii(i)->ii_rwsem, AuLsc_II_##lsc);}
+
+#define RWLockFuncs(name, lsc) \
+	ReadLockFunc(name, lsc); \
+	WriteLockFunc(name, lsc)
+
+RWLockFuncs(child, CHILD);
+RWLockFuncs(child2, CHILD2);
+RWLockFuncs(child3, CHILD3);
+RWLockFuncs(parent, PARENT);
+RWLockFuncs(parent2, PARENT2);
+RWLockFuncs(parent3, PARENT3);
+RWLockFuncs(new, NEW);
+
+#undef ReadLockFunc
+#undef WriteLockFunc
+#undef RWLockFunc
+
+/*
+ * ii_read_unlock, ii_write_unlock, ii_downgrade_lock
+ */
+SimpleUnlockRwsemFuncs(ii, struct inode *i, itoii(i)->ii_rwsem);
+
+/* to debug easier, do not make them inlined functions */
+#define IiMustReadLock(i) do { \
+	SiMustAnyLock((i)->i_sb); \
+	RwMustReadLock(&itoii(i)->ii_rwsem); \
+} while (0)
+
+#define IiMustWriteLock(i) do { \
+	SiMustAnyLock((i)->i_sb); \
+	RwMustWriteLock(&itoii(i)->ii_rwsem); \
+} while (0)
+
+#define IiMustAnyLock(i) do { \
+	SiMustAnyLock((i)->i_sb); \
+	RwMustAnyLock(&itoii(i)->ii_rwsem); \
+} while (0)
+
+#define IiMustNoWaiters(i)	RwMustNoWaiters(&itoii(i)->ii_rwsem)
+
+#endif /* __KERNEL__ */
+#endif /* __AUFS_INODE_H__ */
diff --git a/fs/aufs/misc.c b/fs/aufs/misc.c
new file mode 100755
index 0000000..32e0549
--- /dev/null
+++ b/fs/aufs/misc.c
@@ -0,0 +1,228 @@
+/*
+ * Copyright (C) 2005, 2006, 2007 Junjiro Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+/* $Id: misc.c,v 1.31 2007/05/14 03:41:52 sfjro Exp $ */
+
+//#include <linux/fs.h>
+//#include <linux/namei.h>
+//#include <linux/mm.h>
+//#include <asm/uaccess.h>
+#include "aufs.h"
+
+void *au_kzrealloc(void *p, unsigned int nused, unsigned int new_sz, gfp_t gfp)
+{
+	void *q;
+
+	LKTRTrace("p %p, nused %d, sz %d, ksize %d\n",
+		  p, nused, new_sz, ksize(p));
+	DEBUG_ON(new_sz <= 0);
+	if (new_sz <= nused)
+		return p;
+	if (new_sz <= ksize(p)) {
+		memset(p + nused, 0, new_sz - nused);
+		return p;
+	}
+
+	q = kmalloc(new_sz, gfp);
+	//q = NULL;
+	if (unlikely(!q))
+		return NULL;
+	memcpy(q, p, nused);
+	memset(q + nused, 0, new_sz - nused);
+	//smp_mb();
+	kfree(p);
+	return q;
+}
+
+/* ---------------------------------------------------------------------- */
+
+// todo: make it inline
+struct nameidata *fake_dm(struct nameidata *fake_nd, struct nameidata *nd,
+			  struct super_block *sb, aufs_bindex_t bindex)
+{
+	LKTRTrace("nd %p, b%d\n", nd, bindex);
+
+	if (!nd)
+		return NULL;
+
+	fake_nd->dentry = NULL;
+	fake_nd->mnt = NULL;
+
+#ifndef CONFIG_AUFS_FAKE_DM
+	DiMustAnyLock(nd->dentry);
+
+	if (bindex <= dbend(nd->dentry))
+		fake_nd->dentry = au_h_dptr_i(nd->dentry, bindex);
+	if (fake_nd->dentry) {
+		dget(fake_nd->dentry);
+		fake_nd->mnt = sbr_mnt(sb, bindex);
+		DEBUG_ON(!fake_nd->mnt);
+		mntget(fake_nd->mnt);
+	} else
+		fake_nd = ERR_PTR(-ENOENT);
+#endif
+
+	TraceErrPtr(fake_nd);
+	return fake_nd;
+}
+
+void fake_dm_release(struct nameidata *fake_nd)
+{
+#ifndef CONFIG_AUFS_FAKE_DM
+	if (fake_nd) {
+		mntput(fake_nd->mnt);
+		dput(fake_nd->dentry);
+	}
+#endif
+}
+
+/* ---------------------------------------------------------------------- */
+
+int au_copy_file(struct file *dst, struct file *src, loff_t len,
+		 struct super_block *sb, int *sparse)
+{
+	int err, all_zero, dlgt;
+	unsigned long blksize;
+	char *buf;
+	/* reduce stack space */
+	struct iattr *ia;
+
+	LKTRTrace("%.*s, %.*s\n",
+		  DLNPair(dst->f_dentry), DLNPair(src->f_dentry));
+	DEBUG_ON(!(dst->f_mode & FMODE_WRITE));
+	IMustLock(dst->f_dentry->d_parent->d_inode);
+
+	err = -ENOMEM;
+	blksize = dst->f_dentry->d_sb->s_blocksize;
+	if (!blksize || PAGE_SIZE < blksize)
+		blksize = PAGE_SIZE;
+	LKTRTrace("blksize %lu\n", blksize);
+	buf = kmalloc(blksize, GFP_KERNEL);
+	//buf = NULL;
+	if (unlikely(!buf))
+		goto out;
+	ia = kmalloc(sizeof(*ia), GFP_KERNEL);
+	if (unlikely(!ia))
+		goto out_buf;
+
+	dlgt = need_dlgt(sb);
+	err = all_zero = 0;
+	dst->f_pos = src->f_pos = 0;
+	while (len) {
+		size_t sz, rbytes, wbytes, i;
+		char *p;
+
+		LKTRTrace("len %lld\n", len);
+		sz = blksize;
+		if (len < blksize)
+			sz = len;
+
+		/* support LSM and notify */
+		rbytes = 0;
+		while (!rbytes || err == -EAGAIN || err == -EINTR)
+			err = rbytes = vfsub_read_k(src, buf, sz, &src->f_pos,
+						    dlgt);
+		if (unlikely(err < 0))
+			break;
+
+		all_zero = 0;
+		if (len >= rbytes && rbytes == blksize) {
+			all_zero = 1;
+			p = buf;
+			for (i = 0; all_zero && i < rbytes; i++)
+				all_zero = !*p++;
+		}
+		if (!all_zero) {
+			wbytes = rbytes;
+			p = buf;
+			while (wbytes) {
+				size_t b;
+				/* support LSM and notify */
+				err = b = vfsub_write_k(dst, p, wbytes,
+							&dst->f_pos, dlgt);
+				if (unlikely(err == -EAGAIN || err == -EINTR))
+					continue;
+				if (unlikely(err < 0))
+					break;
+				wbytes -= b;
+				p += b;
+			}
+		} else {
+			loff_t res;
+			LKTRLabel(hole);
+			*sparse = 1;
+			err = res = vfsub_llseek(dst, rbytes, SEEK_CUR);
+			if (unlikely(res < 0))
+				break;
+		}
+		len -= rbytes;
+		err = 0;
+	}
+
+	/* the last block may be a hole */
+	if (unlikely(!err && all_zero)) {
+		struct dentry *h_d = dst->f_dentry;
+		struct inode *h_i = h_d->d_inode;
+
+		LKTRLabel(last hole);
+		do {
+			err = vfsub_write_k(dst, "\0", 1, &dst->f_pos, dlgt);
+		} while (err == -EAGAIN || err == -EINTR);
+		if (err == 1) {
+			ia->ia_size = dst->f_pos;
+			ia->ia_valid = ATTR_SIZE | ATTR_FILE;
+			ia->ia_file = dst;
+			hi_lock_child2(h_i);
+			err = vfsub_notify_change(h_d, ia, dlgt);
+			i_unlock(h_i);
+		}
+	}
+
+	kfree(ia);
+ out_buf:
+	kfree(buf);
+ out:
+	TraceErr(err);
+	return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+int test_ro(struct super_block *sb, aufs_bindex_t bindex, struct inode *inode)
+{
+	int err;
+
+	err = br_rdonly(stobr(sb, bindex));
+	if (!err && inode) {
+		struct inode *hi = au_h_iptr_i(inode, bindex);
+		if (hi)
+			err = IS_IMMUTABLE(hi) ? -EROFS : 0;
+	}
+	return err;
+}
+
+int au_test_perm(struct inode *hidden_inode, int mask, int dlgt)
+{
+	if (!current->fsuid)
+		return 0;
+	if (unlikely(au_is_nfs(hidden_inode->i_sb)
+		     && (mask & MAY_WRITE)
+		     && S_ISDIR(hidden_inode->i_mode)))
+		mask |= MAY_READ; /* force permission check */
+	return vfsub_permission(hidden_inode, mask, NULL, dlgt);
+}
diff --git a/fs/aufs/misc.h b/fs/aufs/misc.h
new file mode 100755
index 0000000..fea4a2c
--- /dev/null
+++ b/fs/aufs/misc.h
@@ -0,0 +1,187 @@
+/*
+ * Copyright (C) 2005, 2006, 2007 Junjiro Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+/* $Id: misc.h,v 1.25 2007/05/14 03:41:52 sfjro Exp $ */
+
+#ifndef __AUFS_MISC_H__
+#define __AUFS_MISC_H__
+
+#ifdef __KERNEL__
+
+#include <linux/fs.h>
+#include <linux/namei.h>
+#include <linux/sched.h>
+#include <linux/version.h>
+#include <linux/aufs_type.h>
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,18)
+#define I_MUTEX_QUOTA			0
+#define lockdep_off()			/* */
+#define lockdep_on()			/* */
+#define mutex_lock_nested(mtx, lsc)	mutex_lock(mtx)
+#define down_write_nested(rw, lsc)	down_write(rw)
+#define down_read_nested(rw, lsc)	down_read(rw)
+#endif
+
+/* ---------------------------------------------------------------------- */
+
+struct aufs_rwsem {
+	struct rw_semaphore	rwsem;
+#ifdef CONFIG_AUFS_DEBUG
+	atomic_t		rcnt;
+#endif
+};
+
+#ifdef CONFIG_AUFS_DEBUG
+#define DbgRcntInit(rw)		atomic_set(&(rw)->rcnt, 0)
+#define DbgRcntInc(rw)		atomic_inc(&(rw)->rcnt)
+#define DbgRcntDec(rw)		WARN_ON(atomic_dec_return(&(rw)->rcnt) < 0)
+#else
+#define DbgRcntInit(rw)		/* */
+#define DbgRcntInc(rw)		/* */
+#define DbgRcntDec(rw)		/* */
+#endif
+
+static inline void rw_init_nolock(struct aufs_rwsem *rw)
+{
+	DbgRcntInit(rw);
+	init_rwsem(&rw->rwsem);
+}
+
+static inline void rw_init_wlock(struct aufs_rwsem *rw)
+{
+	rw_init_nolock(rw);
+	down_write(&rw->rwsem);
+}
+
+static inline void rw_init_wlock_nested(struct aufs_rwsem *rw, unsigned int lsc)
+{
+	rw_init_nolock(rw);
+	down_write_nested(&rw->rwsem, lsc);
+}
+
+static inline void rw_read_lock(struct aufs_rwsem *rw)
+{
+	down_read(&rw->rwsem);
+	DbgRcntInc(rw);
+}
+
+static inline void rw_read_lock_nested(struct aufs_rwsem *rw, unsigned int lsc)
+{
+	down_read_nested(&rw->rwsem, lsc);
+	DbgRcntInc(rw);
+}
+
+static inline void rw_read_unlock(struct aufs_rwsem *rw)
+{
+	DbgRcntDec(rw);
+	up_read(&rw->rwsem);
+}
+
+static inline void rw_dgrade_lock(struct aufs_rwsem *rw)
+{
+	DbgRcntInc(rw);
+	downgrade_write(&rw->rwsem);
+}
+
+static inline void rw_write_lock(struct aufs_rwsem *rw)
+{
+	down_write(&rw->rwsem);
+}
+
+static inline void rw_write_lock_nested(struct aufs_rwsem *rw, unsigned int lsc)
+{
+	down_write_nested(&rw->rwsem, lsc);
+}
+
+static inline void rw_write_unlock(struct aufs_rwsem *rw)
+{
+	up_write(&rw->rwsem);
+}
+
+#if 0 // why is not _nested version defined
+static inline int rw_read_trylock(struct aufs_rwsem *rw)
+{
+	int ret = down_read_trylock(&rw->rwsem);
+	if (ret)
+		DbgRcntInc(rw);
+	return ret;
+}
+
+static inline int rw_write_trylock(struct aufs_rwsem *rw)
+{
+	return down_write_trylock(&rw->rwsem);
+}
+#endif
+
+#undef DbgRcntInit
+#undef DbgRcntInc
+#undef DbgRcntDec
+
+/* to debug easier, do not make them inlined functions */
+#define RwMustNoWaiters(rw)	DEBUG_ON(!list_empty(&(rw)->rwsem.wait_list))
+#define RwMustAnyLock(rw)	DEBUG_ON(down_write_trylock(&(rw)->rwsem))
+#ifdef CONFIG_AUFS_DEBUG
+#define RwMustReadLock(rw) do { \
+	RwMustAnyLock(rw); \
+	DEBUG_ON(!atomic_read(&(rw)->rcnt)); \
+} while (0)
+#define RwMustWriteLock(rw) do { \
+	RwMustAnyLock(rw); \
+	DEBUG_ON(atomic_read(&(rw)->rcnt)); \
+} while (0)
+#else
+#define RwMustReadLock(rw)	RwMustAnyLock(rw)
+#define RwMustWriteLock(rw)	RwMustAnyLock(rw)
+#endif
+
+#define SimpleLockRwsemFuncs(prefix, param, rwsem) \
+static inline void prefix##_read_lock(param) {rw_read_lock(&(rwsem));} \
+static inline void prefix##_write_lock(param) {rw_write_lock(&(rwsem));}
+//static inline void prefix##_read_trylock(param) {rw_read_trylock(&(rwsem));}
+//static inline void prefix##_write_trylock(param) {rw_write_trylock(&(rwsem));}
+//static inline void prefix##_read_trylock_nested(param, lsc)
+//{rw_read_trylock_nested(&(rwsem, lsc));}
+//static inline void prefix##_write_trylock_nestd(param, lsc)
+//{rw_write_trylock_nested(&(rwsem), nested);}
+
+#define SimpleUnlockRwsemFuncs(prefix, param, rwsem) \
+static inline void prefix##_read_unlock(param) {rw_read_unlock(&(rwsem));} \
+static inline void prefix##_write_unlock(param) {rw_write_unlock(&(rwsem));} \
+static inline void prefix##_downgrade_lock(param) {rw_dgrade_lock(&(rwsem));}
+
+#define SimpleRwsemFuncs(prefix, param, rwsem) \
+	SimpleLockRwsemFuncs(prefix, param, rwsem); \
+	SimpleUnlockRwsemFuncs(prefix, param, rwsem)
+
+/* ---------------------------------------------------------------------- */
+
+typedef ssize_t (*readf_t)(struct file*, char __user*, size_t, loff_t*);
+typedef ssize_t (*writef_t)(struct file*, const char __user*, size_t, loff_t*);
+
+void *au_kzrealloc(void *p, unsigned int nused, unsigned int new_sz, gfp_t gfp);
+struct nameidata *fake_dm(struct nameidata *fake_nd, struct nameidata *nd,
+			  struct super_block *sb, aufs_bindex_t bindex);
+void fake_dm_release(struct nameidata *fake_nd);
+int au_copy_file(struct file *dst, struct file *src, loff_t len,
+		 struct super_block *sb, int *sparse);
+int test_ro(struct super_block *sb, aufs_bindex_t bindex, struct inode *inode);
+int au_test_perm(struct inode *h_inode, int mask, int dlgt);
+
+#endif /* __KERNEL__ */
+#endif /* __AUFS_MISC_H__ */
diff --git a/fs/aufs/module.c b/fs/aufs/module.c
new file mode 100755
index 0000000..06c563e
--- /dev/null
+++ b/fs/aufs/module.c
@@ -0,0 +1,334 @@
+/*
+ * Copyright (C) 2007 Junjiro Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+/* $Id: module.c,v 1.9 2007/04/30 05:46:32 sfjro Exp $ */
+
+//#include <linux/init.h>
+//#include <linux/kobject.h>
+#include <linux/module.h>
+//#include <linux/seq_file.h>
+//#include <linux/sysfs.h>
+#include "aufs.h"
+
+/* ---------------------------------------------------------------------- */
+
+/*
+ * aufs caches
+ */
+struct kmem_cache *aufs_cachep[AuCache_Last];
+static int __init create_cache(void)
+{
+#define Cache(type) kmem_cache_create(#type, sizeof(struct type), 0, \
+				      SLAB_RECLAIM_ACCOUNT, NULL, NULL)
+
+	if ((aufs_cachep[AuCache_DINFO] = Cache(aufs_dinfo))
+	    && (aufs_cachep[AuCache_ICNTNR] = Cache(aufs_icntnr))
+	    && (aufs_cachep[AuCache_FINFO] = Cache(aufs_finfo))
+	    //&& (aufs_cachep[AuCache_FINFO] = NULL)
+	    && (aufs_cachep[AuCache_VDIR] = Cache(aufs_vdir))
+	    && (aufs_cachep[AuCache_DEHSTR] = Cache(aufs_dehstr))
+	    && (aufs_cachep[AuCache_HINOTIFY] = Cache(aufs_hinotify)))
+		return 0;
+	return -ENOMEM;
+
+#undef Cache
+}
+
+static void destroy_cache(void)
+{
+	int i;
+	for (i = 0; i < AuCache_Last; i++)
+		if (aufs_cachep[i])
+			kmem_cache_destroy(aufs_cachep[i]);
+}
+
+/* ---------------------------------------------------------------------- */
+
+char au_esc_chars[0x20 + 3]; /* 0x01-0x20, backslash, del, and NULL */
+int au_dir_roflags;
+extern struct file_system_type aufs_fs_type;
+
+#ifdef DbgDlgt
+#include <linux/security.h>
+#include "dbg_dlgt.c"
+#else
+#define dbg_dlgt_init()	0
+#define dbg_dlgt_fin()	/* */
+#endif
+
+/*
+ * functions for module interface.
+ */
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Junjiro Okajima");
+MODULE_DESCRIPTION(AUFS_NAME " -- Another unionfs");
+MODULE_VERSION(AUFS_VERSION);
+
+/* it should be 'byte', but param_set_byte() prints by "%c" */
+short aufs_nwkq = AUFS_NWKQ_DEF;
+MODULE_PARM_DESC(nwkq, "the number of workqueue thread, " AUFS_WKQ_NAME);
+module_param_named(nwkq, aufs_nwkq, short, 0444);
+
+int sysaufs_brs = 0;
+MODULE_PARM_DESC(brs, "use <sysfs>/fs/aufs/brs");
+module_param_named(brs, sysaufs_brs, int, 0444);
+
+static int __init aufs_init(void)
+{
+	int err, i;
+	char *p;
+
+	//sbinfo->si_xino is atomic_long_t
+	BUILD_BUG_ON(sizeof(ino_t) != sizeof(long));
+
+#ifdef CONFIG_AUFS_DEBUG
+	{
+		struct aufs_destr destr;
+		destr.len = -1;
+		DEBUG_ON(destr.len < NAME_MAX);
+	}
+
+#ifdef CONFIG_4KSTACKS
+	printk("CONFIG_4KSTACKS is defined.\n");
+#endif
+#if 0 // verbose debug
+	{
+		union {
+			struct aufs_branch *br;
+			struct aufs_dinfo *di;
+			struct aufs_finfo *fi;
+			struct aufs_iinfo *ii;
+			struct aufs_hinode *hi;
+			struct aufs_sbinfo *si;
+			struct aufs_destr *destr;
+			struct aufs_de *de;
+			struct aufs_wh *wh;
+			struct aufs_vdir *vd;
+		} u;
+
+		printk("br{"
+		       "xino %d, readf %d, writef %d, "
+		       "id %d, perm %d, mnt %d, count %d, "
+		       "wh_sem %d, wh %d, run %d} %d\n",
+		       offsetof(typeof(*u.br), br_xino),
+		       offsetof(typeof(*u.br), br_xino_read),
+		       offsetof(typeof(*u.br), br_xino_write),
+		       offsetof(typeof(*u.br), br_id),
+		       offsetof(typeof(*u.br), br_perm),
+		       offsetof(typeof(*u.br), br_mnt),
+		       offsetof(typeof(*u.br), br_count),
+		       offsetof(typeof(*u.br), br_wh_rwsem),
+		       offsetof(typeof(*u.br), br_wh),
+		       offsetof(typeof(*u.br), br_wh_running),
+		       sizeof(*u.br));
+		printk("di{gen %d, rwsem %d, bstart %d, bend %d, bwh %d, "
+		       "bdiropq %d, hdentry %d, reval %d} %d\n",
+		       offsetof(typeof(*u.di), di_generation),
+		       offsetof(typeof(*u.di), di_rwsem),
+		       offsetof(typeof(*u.di), di_bstart),
+		       offsetof(typeof(*u.di), di_bend),
+		       offsetof(typeof(*u.di), di_bwh),
+		       offsetof(typeof(*u.di), di_bdiropq),
+		       offsetof(typeof(*u.di), di_hdentry),
+		       offsetof(typeof(*u.di), di_reval),
+		       sizeof(*u.di));
+		printk("fi{gen %d, rwsem %d, hfile %d, bstart %d, bend %d, "
+		       "h_vm_ops %d, vdir_cach %d} %d\n",
+		       offsetof(typeof(*u.fi), fi_generation),
+		       offsetof(typeof(*u.fi), fi_rwsem),
+		       offsetof(typeof(*u.fi), fi_hfile),
+		       offsetof(typeof(*u.fi), fi_bstart),
+		       offsetof(typeof(*u.fi), fi_bend),
+		       offsetof(typeof(*u.fi), fi_h_vm_ops),
+		       offsetof(typeof(*u.fi), fi_vdir_cache),
+		       sizeof(*u.fi));
+		printk("ii{rwsem %d, bstart %d, bend %d, hinode %d, vdir %d} "
+		       "%d\n",
+		       offsetof(typeof(*u.ii), ii_rwsem),
+		       offsetof(typeof(*u.ii), ii_bstart),
+		       offsetof(typeof(*u.ii), ii_bend),
+		       offsetof(typeof(*u.ii), ii_hinode),
+		       offsetof(typeof(*u.ii), ii_vdir),
+		       sizeof(*u.ii));
+		printk("hi{inode %d, id %d, notify %d} %d\n",
+		       offsetof(typeof(*u.hi), hi_inode),
+		       offsetof(typeof(*u.hi), hi_id),
+		       offsetof(typeof(*u.hi), hi_notify),
+		       sizeof(*u.hi));
+		printk("si{rwsem %d, gen %d, "
+		       "failed_refresh %d, "
+		       "bend %d, last id %d, br %d, "
+		       "flags %d, "
+		       "xino %d, "
+		       "rdcache %d, "
+		       "dirwh %d, "
+		       "pl_lock %d, pl %d, "
+		       "kobj %d} %d\n",
+		       offsetof(typeof(*u.si), si_rwsem),
+		       offsetof(typeof(*u.si), si_generation),
+		       -1,//offsetof(typeof(*u.si), si_failed_refresh_dirs),
+		       offsetof(typeof(*u.si), si_bend),
+		       offsetof(typeof(*u.si), si_last_br_id),
+		       offsetof(typeof(*u.si), si_branch),
+		       offsetof(typeof(*u.si), si_flags),
+		       offsetof(typeof(*u.si), si_xino),
+		       offsetof(typeof(*u.si), si_rdcache),
+		       offsetof(typeof(*u.si), si_dirwh),
+		       offsetof(typeof(*u.si), si_plink_lock),
+		       offsetof(typeof(*u.si), si_plink),
+		       offsetof(typeof(*u.si), si_kobj),
+		       sizeof(*u.si));
+		printk("destr{len %d, name %d} %d\n",
+		       offsetof(typeof(*u.destr), len),
+		       offsetof(typeof(*u.destr), name),
+		       sizeof(*u.destr));
+		printk("de{ino %d, type %d, str %d} %d\n",
+		       offsetof(typeof(*u.de), de_ino),
+		       offsetof(typeof(*u.de), de_type),
+		       offsetof(typeof(*u.de), de_str),
+		       sizeof(*u.de));
+		printk("wh{hash %d, bindex %d, str %d} %d\n",
+		       offsetof(typeof(*u.wh), wh_hash),
+		       offsetof(typeof(*u.wh), wh_bindex),
+		       offsetof(typeof(*u.wh), wh_str),
+		       sizeof(*u.wh));
+		printk("vd{deblk %d, nblk %d, last %d, ver %d, jiffy %d} %d\n",
+		       offsetof(typeof(*u.vd), vd_deblk),
+		       offsetof(typeof(*u.vd), vd_nblk),
+		       offsetof(typeof(*u.vd), vd_last),
+		       offsetof(typeof(*u.vd), vd_version),
+		       offsetof(typeof(*u.vd), vd_jiffy),
+		       sizeof(*u.vd));
+	}
+#endif
+#endif
+
+	p = au_esc_chars;
+	for (i = 1; i <= ' '; i++)
+		*p++ = i;
+	*p++ = '\\';
+	*p++ = '\x7f';
+	*p = 0;
+
+	au_dir_roflags = au_file_roflags(O_DIRECTORY | O_LARGEFILE);
+#ifndef CONFIG_AUFS_SYSAUFS
+	sysaufs_brs = 0;
+#endif
+
+	err = -EINVAL;
+	if (unlikely(aufs_nwkq <= 0))
+		goto out;
+	err = create_cache();
+	if (unlikely(err))
+		goto out;
+	err = sysaufs_init();
+	if (unlikely(err))
+		goto out_cache;
+	err = au_wkq_init();
+	if (unlikely(err))
+		goto out_kobj;
+	err = au_inotify_init();
+	if (unlikely(err))
+		goto out_wkq;
+	err = dbg_dlgt_init();
+	if (unlikely(err))
+		goto out_inotify;
+	err = register_filesystem(&aufs_fs_type);
+	if (unlikely(err))
+		goto out_dlgt;
+	printk(AUFS_NAME " " AUFS_VERSION "\n");
+	return 0; /* success */
+
+ out_dlgt:
+	dbg_dlgt_fin();
+ out_inotify:
+	au_inotify_fin();
+ out_wkq:
+	au_wkq_fin();
+ out_kobj:
+	sysaufs_fin();
+ out_cache:
+	destroy_cache();
+ out:
+	TraceErr(err);
+	return err;
+}
+
+static void __exit aufs_exit(void)
+{
+	unregister_filesystem(&aufs_fs_type);
+	dbg_dlgt_fin();
+	au_inotify_fin();
+	au_wkq_fin();
+	sysaufs_fin();
+	destroy_cache();
+}
+
+module_init(aufs_init);
+module_exit(aufs_exit);
+
+/* ---------------------------------------------------------------------- */
+
+// fake Kconfig
+#if 1
+#ifdef CONFIG_AUFS_HINOTIFY
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,18)
+#error CONFIG_AUFS_HINOTIFY is supported in linux-2.6.18 and later.
+#endif
+#ifndef CONFIG_INOTIFY
+#error enable CONFIG_INOTIFY to use CONFIG_AUFS_HINOTIFY.
+#endif
+#endif
+
+#if AUFS_BRANCH_MAX > 511 && BITS_PER_LONG == 64 && PAGE_SIZE == 4096
+#warning For 4k pagesize and 64bit environment, \
+	CONFIG_AUFS_BRANCH_MAX_511 or smaller is recommended.
+#endif
+
+#ifdef CONFIG_AUFS_SYSAUFS
+#ifndef CONFIG_SYSFS
+#error CONFIG_AUFS_SYSAUFS requires CONFIG_SYSFS.
+#endif
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,18)
+#error CONFIG_AUFS_SYSAUFS requires linux-2.6.18 and later.
+#endif
+#endif
+
+#ifdef CONFIG_AUFS_EXPORT
+#if !defined(CONFIG_EXPORTFS) && !defined(CONFIG_EXPORTFS_MODULE)
+#error CONFIG_AUFS_EXPORT requires CONFIG_EXPORTFS
+#endif
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,18)
+#error CONFIG_AUFS_EXPORT requires linux-2.6.18 and later.
+#endif
+#if defined(CONFIG_EXPORTFS_MODULE) && defined(CONFIG_AUFS)
+#error need CONFIG_EXPORTFS=y to link aufs statically with CONFIG_AUFS_EXPORT
+#endif
+#endif
+
+#ifdef CONFIG_DEBUG_PROVE_LOCKING
+#if MAX_LOCKDEP_SUBCLASSES < AuLsc_End
+#warning lockdep will not work since aufs uses deeper locks.
+#endif
+#endif
+
+#ifdef CONFIG_AUFS_COMPAT
+#warning CONFIG_AUFS_COMPAT will be removed in the near future.
+#endif
+
+#endif
diff --git a/fs/aufs/module.h b/fs/aufs/module.h
new file mode 100755
index 0000000..3769861
--- /dev/null
+++ b/fs/aufs/module.h
@@ -0,0 +1,60 @@
+/*
+ * Copyright (C) 2007 Junjiro Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+/* $Id: module.h,v 1.8 2007/05/14 03:41:52 sfjro Exp $ */
+
+#ifndef __AUFS_MODULE_H__
+#define __AUFS_MODULE_H__
+
+#ifdef __KERNEL__
+
+#include <linux/slab.h>
+
+/* ---------------------------------------------------------------------- */
+
+/* module parameters */
+extern short aufs_nwkq;
+extern int sysaufs_brs;
+
+/* ---------------------------------------------------------------------- */
+
+extern char au_esc_chars[];
+extern int au_dir_roflags;
+
+/* kmem cache */
+enum {AuCache_DINFO, AuCache_ICNTNR, AuCache_FINFO, AuCache_VDIR,
+      AuCache_DEHSTR, AuCache_HINOTIFY, AuCache_Last};
+extern struct kmem_cache *aufs_cachep[];
+
+#define CacheFuncs(name, index) \
+static inline void *cache_alloc_##name(void) \
+{return kmem_cache_alloc(aufs_cachep[index], GFP_KERNEL);} \
+static inline void cache_free_##name(void *p) \
+{kmem_cache_free(aufs_cachep[index], p);}
+
+CacheFuncs(dinfo, AuCache_DINFO);
+CacheFuncs(icntnr, AuCache_ICNTNR);
+CacheFuncs(finfo, AuCache_FINFO);
+CacheFuncs(vdir, AuCache_VDIR);
+CacheFuncs(dehstr, AuCache_DEHSTR);
+CacheFuncs(hinotify, AuCache_HINOTIFY);
+
+#undef CacheFuncs
+
+#endif /* __KERNEL__ */
+#endif /* __AUFS_MODULE_H__ */
diff --git a/fs/aufs/opts.c b/fs/aufs/opts.c
new file mode 100755
index 0000000..c1a9445
--- /dev/null
+++ b/fs/aufs/opts.c
@@ -0,0 +1,1043 @@
+/*
+ * Copyright (C) 2005, 2006, 2007 Junjiro Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+/* $Id: opts.c,v 1.34 2007/05/14 03:40:27 sfjro Exp $ */
+
+#include <asm/types.h> // a distribution requires
+#include <linux/parser.h>
+#include "aufs.h"
+
+enum {
+	Opt_br,
+	Opt_add, Opt_del, Opt_mod, Opt_append, Opt_prepend,
+	Opt_idel, Opt_imod,
+	Opt_dirwh, Opt_rdcache, Opt_deblk, Opt_nhash,
+	Opt_xino, Opt_zxino, Opt_noxino,
+	Opt_plink, Opt_noplink, Opt_list_plink, Opt_clean_plink,
+	Opt_udba,
+	Opt_diropq_a, Opt_diropq_w,
+	Opt_warn_perm, Opt_nowarn_perm,
+	Opt_findrw_dir, Opt_findrw_br,
+	Opt_coo,
+	Opt_dlgt, Opt_nodlgt,
+	Opt_tail, Opt_ignore, Opt_err
+};
+
+static match_table_t options = {
+	{Opt_br, "br=%s"},
+	{Opt_br, "br:%s"},
+
+	{Opt_add, "add=%d:%s"},
+	{Opt_add, "add:%d:%s"},
+	{Opt_add, "ins=%d:%s"},
+	{Opt_add, "ins:%d:%s"},
+	{Opt_append, "append=%s"},
+	{Opt_append, "append:%s"},
+	{Opt_prepend, "prepend=%s"},
+	{Opt_prepend, "prepend:%s"},
+
+	{Opt_del, "del=%s"},
+	{Opt_del, "del:%s"},
+	//{Opt_idel, "idel:%d"},
+	{Opt_mod, "mod=%s"},
+	{Opt_mod, "mod:%s"},
+	//{Opt_imod, "imod:%d:%s"},
+
+	{Opt_dirwh, "dirwh=%d"},
+	{Opt_dirwh, "dirwh:%d"},
+
+	{Opt_xino, "xino=%s"},
+	{Opt_xino, "xino:%s"},
+	{Opt_noxino, "noxino"},
+	//{Opt_zxino, "zxino=%s"},
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
+	{Opt_plink, "plink"},
+	{Opt_noplink, "noplink"},
+#ifdef CONFIG_AUFS_DEBUG
+	{Opt_list_plink, "list_plink"},
+#endif
+	{Opt_clean_plink, "clean_plink"},
+#endif
+
+	{Opt_udba, "udba=%s"},
+
+	{Opt_diropq_a, "diropq=always"},
+	{Opt_diropq_a, "diropq=a"},
+	{Opt_diropq_w, "diropq=whiteouted"},
+	{Opt_diropq_w, "diropq=w"},
+
+	{Opt_warn_perm, "warn_perm"},
+	{Opt_nowarn_perm, "nowarn_perm"},
+
+#ifdef CONFIG_AUFS_DLGT
+	{Opt_dlgt, "dlgt"},
+	{Opt_nodlgt, "nodlgt"},
+#endif
+
+	{Opt_rdcache, "rdcache=%d"},
+	{Opt_rdcache, "rdcache:%d"},
+#if 0
+	{Opt_findrw_dir, "findrw=dir"},
+	{Opt_findrw_br, "findrw=br"},
+
+	{Opt_coo, "coo=%s"},
+
+	{Opt_deblk, "deblk=%d"},
+	{Opt_deblk, "deblk:%d"},
+	{Opt_nhash, "nhash=%d"},
+	{Opt_nhash, "nhash:%d"},
+#endif
+
+	{Opt_br, "dirs=%s"},
+	{Opt_ignore, "debug=%d"},
+	{Opt_ignore, "delete=whiteout"},
+	{Opt_ignore, "delete=all"},
+	{Opt_ignore, "imap=%s"},
+
+	{Opt_err, NULL}
+};
+
+/* ---------------------------------------------------------------------- */
+
+#define RW		"rw"
+#define RO		"ro"
+#define WH		"wh"
+#define RR		"rr"
+#define NoLinkWH	"nolwh"
+
+static match_table_t brperms = {
+	{AuBr_RR, RR},
+	{AuBr_RO, RO},
+	{AuBr_RW, RW},
+
+	{AuBr_RRWH, RR "+" WH},
+	{AuBr_ROWH, RO "+" WH},
+	{AuBr_RWNoLinkWH, RW "+" NoLinkWH},
+
+	{AuBr_ROWH, "nfsro"},
+	{AuBr_RO, NULL}
+};
+
+static int br_perm_val(char *perm)
+{
+	int val;
+	substring_t args[MAX_OPT_ARGS];
+
+	DEBUG_ON(!perm || !*perm);
+	LKTRTrace("perm %s\n", perm);
+	val = match_token(perm, brperms, args);
+	TraceErr(val);
+	return val;
+}
+
+int br_perm_str(char *p, unsigned int len, int brperm)
+{
+	struct match_token *bp = brperms;
+
+	LKTRTrace("len %d, 0x%x\n", len, brperm);
+
+	while (bp->pattern) {
+		if (bp->token == brperm) {
+			if (strlen(bp->pattern) < len) {
+				strcpy(p, bp->pattern);
+				return 0;
+			} else
+				return -E2BIG;
+		}
+		bp++;
+	}
+
+	return -EIO;
+}
+
+/* ---------------------------------------------------------------------- */
+
+static match_table_t udbalevel = {
+	{AuFlag_UDBA_REVAL, "reval"},
+#ifdef CONFIG_AUFS_HINOTIFY
+	{AuFlag_UDBA_INOTIFY, "inotify"},
+#endif
+	{AuFlag_UDBA_NONE, "none"},
+	{-1, NULL}
+};
+
+static int udba_val(char *str)
+{
+	substring_t args[MAX_OPT_ARGS];
+	return match_token(str, udbalevel, args);
+}
+
+au_parser_pattern_t udba_str(int udba)
+{
+	struct match_token *p = udbalevel;
+	while (p->pattern) {
+		if (p->token == udba)
+			return p->pattern;
+		p++;
+	}
+	BUG();
+	return "??";
+}
+
+void udba_set(struct super_block *sb, unsigned int flg)
+{
+	au_flag_clr(sb, AuMask_UDBA);
+	au_flag_set(sb, flg);
+}
+
+/* ---------------------------------------------------------------------- */
+
+static match_table_t coolevel = {
+	{AuFlag_COO_LEAF, "leaf"},
+	{AuFlag_COO_ALL, "all"},
+	{AuFlag_COO_NONE, "none"},
+	{-1, NULL}
+};
+
+#if 0
+static int coo_val(char *str)
+{
+	substring_t args[MAX_OPT_ARGS];
+	return match_token(str, coolevel, args);
+}
+#endif
+
+au_parser_pattern_t coo_str(int coo)
+{
+	struct match_token *p = coolevel;
+	while (p->pattern) {
+		if (p->token == coo)
+			return p->pattern;
+		p++;
+	}
+	BUG();
+	return "??";
+}
+static void coo_set(struct super_block *sb, unsigned int flg)
+{
+	au_flag_clr(sb, AuMask_COO);
+	au_flag_set(sb, flg);
+}
+
+/* ---------------------------------------------------------------------- */
+
+static const int lkup_dirflags = LOOKUP_FOLLOW | LOOKUP_DIRECTORY;
+
+#ifdef CONFIG_AUFS_DEBUG
+static void dump_opts(struct opts *opts)
+{
+	/* reduce stack space */
+	union {
+		struct opt_add *add;
+		struct opt_del *del;
+		struct opt_mod *mod;
+		struct opt_xino *xino;
+	} u;
+	struct opt *opt;
+
+	TraceEnter();
+
+	opt = opts->opt;
+	while (/* opt < opts_tail && */ opt->type != Opt_tail) {
+		switch (opt->type) {
+		case Opt_add:
+			u.add = &opt->add;
+			LKTRTrace("add {b%d, %s, 0x%x, %p}\n",
+				  u.add->bindex, u.add->path, u.add->perm,
+				  u.add->nd.dentry);
+			break;
+		case Opt_del:
+		case Opt_idel:
+			u.del = &opt->del;
+			LKTRTrace("del {%s, %p}\n", u.del->path, u.del->h_root);
+			break;
+		case Opt_mod:
+		case Opt_imod:
+			u.mod = &opt->mod;
+			LKTRTrace("mod {%s, 0x%x, %p}\n",
+				  u.mod->path, u.mod->perm, u.mod->h_root);
+			break;
+		case Opt_append:
+			u.add = &opt->add;
+			LKTRTrace("append {b%d, %s, 0x%x, %p}\n",
+				  u.add->bindex, u.add->path, u.add->perm,
+				  u.add->nd.dentry);
+			break;
+		case Opt_prepend:
+			u.add = &opt->add;
+			LKTRTrace("prepend {b%d, %s, 0x%x, %p}\n",
+				  u.add->bindex, u.add->path, u.add->perm,
+				  u.add->nd.dentry);
+			break;
+		case Opt_dirwh:
+			LKTRTrace("dirwh %d\n", opt->dirwh);
+			break;
+		case Opt_rdcache:
+			LKTRTrace("rdcache %d\n", opt->rdcache);
+			break;
+		case Opt_xino:
+			u.xino = &opt->xino;
+			LKTRTrace("xino {%s %.*s}\n",
+				  u.xino->path, DLNPair(u.xino->file->f_dentry));
+			break;
+		case Opt_noxino:
+			LKTRLabel(noxino);
+			break;
+		case Opt_plink:
+			LKTRLabel(plink);
+			break;
+		case Opt_noplink:
+			LKTRLabel(noplink);
+			break;
+		case Opt_list_plink:
+			LKTRLabel(list_plink);
+			break;
+		case Opt_clean_plink:
+			LKTRLabel(clean_plink);
+			break;
+		case Opt_udba:
+			LKTRTrace("udba %d, %s\n",
+				  opt->udba, udba_str(opt->udba));
+			break;
+		case Opt_diropq_a:
+			LKTRLabel(diropq_a);
+			break;
+		case Opt_diropq_w:
+			LKTRLabel(diropq_w);
+			break;
+		case Opt_warn_perm:
+			LKTRLabel(warn_perm);
+			break;
+		case Opt_nowarn_perm:
+			LKTRLabel(nowarn_perm);
+			break;
+		case Opt_dlgt:
+			LKTRLabel(dlgt);
+			break;
+		case Opt_nodlgt:
+			LKTRLabel(nodlgt);
+			break;
+		case Opt_coo:
+			LKTRTrace("coo %d, %s\n", opt->coo, coo_str(opt->coo));
+			break;
+		default:
+			BUG();
+		}
+		opt++;
+	}
+}
+#else
+#define dump_opts(opts) /* */
+#endif
+
+void au_free_opts(struct opts *opts)
+{
+	struct opt *opt;
+
+	TraceEnter();
+
+	opt = opts->opt;
+	while (opt->type != Opt_tail) {
+		switch (opt->type) {
+		case Opt_add:
+		case Opt_append:
+		case Opt_prepend:
+			path_release(&opt->add.nd);
+			break;
+		case Opt_del:
+		case Opt_idel:
+			dput(opt->del.h_root);
+			break;
+		case Opt_mod:
+		case Opt_imod:
+			dput(opt->mod.h_root);
+			break;
+		case Opt_xino:
+			fput(opt->xino.file);
+			break;
+		}
+		opt++;
+	}
+}
+
+static int opt_add(struct opt *opt, char *opt_str, struct super_block *sb,
+		   aufs_bindex_t bindex)
+{
+	int err;
+	struct opt_add *add = &opt->add;
+	char *p;
+
+	LKTRTrace("%s, b%d\n", opt_str, bindex);
+
+	add->bindex = bindex;
+	add->perm = AuBr_RO;
+	if (!bindex && !(sb->s_flags & MS_RDONLY))
+		add->perm = AuBr_RW;
+#ifdef CONFIG_AUFS_COMPAT
+	add->perm = AuBr_RW;
+#endif
+	add->path = opt_str;
+	p = strchr(opt_str, '=');
+	if (unlikely(p)) {
+		*p++ = 0;
+		if (*p)
+			add->perm = br_perm_val(p);
+	}
+
+	// LSM may detect it
+	// do not superio.
+	err = path_lookup(add->path, lkup_dirflags, &add->nd);
+	//err = -1;
+	if (!err) {
+		opt->type = Opt_add;
+		goto out;
+	}
+	Err("lookup failed %s (%d)\n", add->path, err);
+	err = -EINVAL;
+
+ out:
+	TraceErr(err);
+	return err;
+}
+
+/* called without aufs lock */
+int au_parse_opts(struct super_block *sb, char *str, struct opts *opts)
+{
+	int err, n;
+	struct dentry *root;
+	struct opt *opt, *opt_tail;
+	char *opt_str;
+	substring_t args[MAX_OPT_ARGS];
+	aufs_bindex_t bindex;
+	struct nameidata nd;
+	/* reduce stack space */
+	union {
+		struct opt_del *del;
+		struct opt_mod *mod;
+		struct opt_xino *xino;
+	} u;
+	struct file *file;
+
+	LKTRTrace("%s, nopts %d\n", str, opts->max_opt);
+
+	root = sb->s_root;
+	err = 0;
+	bindex = 0;
+	opt = opts->opt;
+	opt_tail = opt + opts->max_opt - 1;
+	opt->type = Opt_tail;
+	while (!err && (opt_str = strsep(&str, ",")) && *opt_str) {
+		int token, skipped;
+		char *p;
+		err = -EINVAL;
+		token = match_token(opt_str, options, args);
+		LKTRTrace("%s, token %d, args[0]{%p, %p}\n",
+			  opt_str, token, args[0].from, args[0].to);
+
+		skipped = 0;
+		switch (token) {
+		case Opt_br:
+			err = 0;
+			while (!err && (opt_str = strsep(&args[0].from, ":"))
+			       && *opt_str) {
+				err = opt_add(opt, opt_str, sb, bindex++);
+				//if (LktrCond) err = -1;
+				if (unlikely(!err && ++opt > opt_tail)) {
+					err = -E2BIG;
+					break;
+				}
+				opt->type = Opt_tail;
+				skipped = 1;
+			}
+			break;
+		case Opt_add:
+			if (unlikely(match_int(&args[0], &n))) {
+				Err("bad integer in %s\n", opt_str);
+				break;
+			}
+			bindex = n;
+			err = opt_add(opt, args[1].from, sb, bindex);
+			break;
+		case Opt_append:
+		case Opt_prepend:
+			err = opt_add(opt, args[0].from, sb, /*dummy bindex*/1);
+			if (!err)
+				opt->type = token;
+			break;
+		case Opt_del:
+			u.del = &opt->del;
+			u.del->path = args[0].from;
+			LKTRTrace("del path %s\n", u.del->path);
+			// LSM may detect it
+			// do not superio.
+			err = path_lookup(u.del->path, lkup_dirflags, &nd);
+			if (unlikely(err)) {
+				Err("lookup failed %s (%d)\n", u.del->path, err);
+				break;
+			}
+			u.del->h_root = dget(nd.dentry);
+			path_release(&nd);
+			opt->type = token;
+			break;
+#if 0
+		case Opt_idel:
+			u.del = &opt->del;
+			u.del->path = "(indexed)";
+			if (unlikely(match_int(&args[0], &n))) {
+				Err("bad integer in %s\n", opt_str);
+				break;
+			}
+			bindex = n;
+			aufs_read_lock(root, !AUFS_I_RLOCK);
+			if (bindex < 0 || sbend(sb) < bindex) {
+				Err("out of bounds, %d\n", bindex);
+				aufs_read_unlock(root, !AUFS_I_RLOCK);
+				break;
+			}
+			err = 0;
+			u.del->h_root = dget(au_h_dptr_i(root, bindex));
+			opt->type = token;
+			aufs_read_unlock(root, !AUFS_I_RLOCK);
+			break;
+#endif
+
+		case Opt_mod:
+			u.mod = &opt->mod;
+			u.mod->path = args[0].from;
+			p = strchr(u.mod->path, '=');
+			if (unlikely(!p)) {
+				Err("no permssion %s\n", opt_str);
+				break;
+			}
+			*p++ = 0;
+			u.mod->perm = br_perm_val(p);
+			LKTRTrace("mod path %s, perm 0x%x, %s\n",
+				  u.mod->path, u.mod->perm, p);
+			// LSM may detect it
+			// do not superio.
+			err = path_lookup(u.mod->path, lkup_dirflags, &nd);
+			if (unlikely(err)) {
+				Err("lookup failed %s (%d)\n", u.mod->path, err);
+				break;
+			}
+			u.mod->h_root = dget(nd.dentry);
+			path_release(&nd);
+			opt->type = token;
+			break;
+#if 0
+		case Opt_imod:
+			u.mod = &opt->mod;
+			u.mod->path = "(indexed)";
+			if (unlikely(match_int(&args[0], &n))) {
+				Err("bad integer in %s\n", opt_str);
+				break;
+			}
+			bindex = n;
+			aufs_read_lock(root, !AUFS_I_RLOCK);
+			if (bindex < 0 || sbend(sb) < bindex) {
+				Err("out of bounds, %d\n", bindex);
+				aufs_read_unlock(root, !AUFS_I_RLOCK);
+				break;
+			}
+			u.mod->perm = br_perm_val(args[1].from);
+			LKTRTrace("mod path %s, perm 0x%x, %s\n",
+				  u.mod->path, u.mod->perm, args[1].from);
+			err = 0;
+			u.mod->h_root = dget(au_h_dptr_i(root, bindex));
+			opt->type = token;
+			aufs_read_unlock(root, !AUFS_I_RLOCK);
+			break;
+#endif
+		case Opt_xino:
+			u.xino = &opt->xino;
+			file = xino_create(sb, args[0].from, /*silent*/0,
+					   /*parent*/NULL);
+			err = PTR_ERR(file);
+			if (IS_ERR(file))
+				break;
+			err = -EINVAL;
+			if (unlikely(file->f_dentry->d_sb == sb)) {
+				fput(file);
+				Err("%s must be outside\n", args[0].from);
+				break;
+			}
+			err = 0;
+			u.xino->file = file;
+			u.xino->path = args[0].from;
+			opt->type = token;
+			break;
+
+		case Opt_dirwh:
+			if (unlikely(match_int(&args[0], &opt->dirwh)))
+				break;
+			err = 0;
+			opt->type = token;
+			break;
+
+		case Opt_rdcache:
+			if (unlikely(match_int(&args[0], &opt->rdcache)))
+				break;
+			err = 0;
+			opt->type = token;
+			break;
+
+		case Opt_noxino:
+		case Opt_plink:
+		case Opt_noplink:
+		case Opt_list_plink:
+		case Opt_clean_plink:
+		case Opt_diropq_a:
+		case Opt_diropq_w:
+		case Opt_warn_perm:
+		case Opt_nowarn_perm:
+		case Opt_dlgt:
+		case Opt_nodlgt:
+			err = 0;
+			opt->type = token;
+			break;
+
+		case Opt_udba:
+			opt->udba = udba_val(args[0].from);
+			if (opt->udba >= 0) {
+				err = 0;
+				opt->type = token;
+			}
+			break;
+
+#if 0
+		case Opt_coo:
+			opt->coo = coo_val(args[0].from);
+			if (opt->coo >= 0) {
+				err = 0;
+				opt->type = token;
+			}
+			break;
+#endif
+
+		case Opt_ignore:
+#ifndef CONFIG_AUFS_COMPAT
+			Warn("ignored %s\n", opt_str);
+#endif
+			skipped = 1;
+			err = 0;
+			break;
+		case Opt_err:
+			Err("unknown option %s\n", opt_str);
+			break;
+		}
+
+		if (!err && !skipped) {
+			if (unlikely(++opt > opt_tail)) {
+				err = -E2BIG;
+				opt--;
+				opt->type = Opt_tail;
+				break;
+			}
+			opt->type = Opt_tail;
+		}
+	}
+
+	dump_opts(opts);
+	if (unlikely(err))
+		au_free_opts(opts);
+	TraceErr(err);
+	return err;
+}
+
+/*
+ * returns,
+ * plus: processed without an error
+ * zero: unprocessed
+ */
+static int au_do_opt_simple(struct super_block *sb, struct opt *opt,
+			    int remount, unsigned int *given)
+{
+	int err;
+	struct aufs_sbinfo *sbinfo = stosi(sb);
+
+	TraceEnter();
+
+	err = 1; /* handled */
+	switch (opt->type) {
+	case Opt_udba:
+		udba_set(sb, opt->udba);
+		*given |= opt->udba;
+		break;
+
+	case Opt_plink:
+		au_flag_set(sb, AuFlag_PLINK);
+		*given |= AuFlag_PLINK;
+		break;
+	case Opt_noplink:
+		if (au_flag_test(sb, AuFlag_PLINK))
+			au_put_plink(sb);
+		au_flag_clr(sb, AuFlag_PLINK);
+		*given |= AuFlag_PLINK;
+		break;
+	case Opt_list_plink:
+		if (au_flag_test(sb, AuFlag_PLINK))
+			au_list_plink(sb);
+		break;
+	case Opt_clean_plink:
+		if (au_flag_test(sb, AuFlag_PLINK))
+			au_put_plink(sb);
+		break;
+
+	case Opt_diropq_a:
+		au_flag_set(sb, AuFlag_ALWAYS_DIROPQ);
+		*given |= AuFlag_ALWAYS_DIROPQ;
+		break;
+	case Opt_diropq_w:
+		au_flag_clr(sb, AuFlag_ALWAYS_DIROPQ);
+		*given |= AuFlag_ALWAYS_DIROPQ;
+		break;
+
+	case Opt_dlgt:
+		au_flag_set(sb, AuFlag_DLGT);
+		*given |= AuFlag_DLGT;
+		break;
+	case Opt_nodlgt:
+		au_flag_clr(sb, AuFlag_DLGT);
+		*given |= AuFlag_DLGT;
+		break;
+
+	case Opt_warn_perm:
+		au_flag_set(sb, AuFlag_WARN_PERM);
+		*given |= AuFlag_WARN_PERM;
+		break;
+	case Opt_nowarn_perm:
+		au_flag_clr(sb, AuFlag_WARN_PERM);
+		*given |= AuFlag_WARN_PERM;
+		break;
+
+	case Opt_coo:
+		coo_set(sb, opt->coo);
+		*given |= opt->coo;
+		break;
+
+	case Opt_dirwh:
+		sbinfo->si_dirwh = opt->dirwh;
+		break;
+
+	case Opt_rdcache:
+		sbinfo->si_rdcache = opt->rdcache * HZ;
+		break;
+
+	default:
+		err = 0;
+		break;
+	}
+
+	TraceErr(err);
+	return err;
+}
+
+/*
+ * returns tri-state.
+ * plus: processed without an error
+ * zero: unprocessed
+ * minus: error
+ */
+static int au_do_opt_br(struct super_block *sb, struct opt *opt, int remount,
+			int *do_refresh)
+{
+	int err;
+
+	TraceEnter();
+
+	err = 0;
+	switch (opt->type) {
+	case Opt_append:
+		opt->add.bindex = sbend(sb) + 1;
+		goto add;
+	case Opt_prepend:
+		opt->add.bindex = 0;
+	add:
+	case Opt_add:
+		err = br_add(sb, &opt->add, remount);
+		if (!err)
+			*do_refresh = err = 1;
+		break;
+
+	case Opt_del:
+	case Opt_idel:
+		err = br_del(sb, &opt->del, remount);
+		if (!err)
+			*do_refresh = err = 1;
+		break;
+
+	case Opt_mod:
+	case Opt_imod:
+		err = br_mod(sb, &opt->mod, remount, do_refresh);
+		if (!err)
+			err = 1;
+		break;
+	}
+
+	TraceErr(err);
+	return err;
+}
+
+static int au_do_opt_xino(struct super_block *sb, struct opt *opt, int remount,
+			  struct opt_xino **opt_xino)
+{
+	int err;
+
+	TraceEnter();
+
+	err = 0;
+	switch (opt->type) {
+	case Opt_xino:
+		err = xino_set(sb, &opt->xino, remount);
+		if (!err)
+			*opt_xino = &opt->xino;
+		break;
+	case Opt_noxino:
+		err = xino_clr(sb);
+		break;
+	}
+
+	TraceErr(err);
+	return err;
+}
+
+static int verify_opts(struct super_block *sb, int remount)
+{
+	int err;
+	aufs_bindex_t bindex, bend;
+	struct aufs_branch *br;
+	struct dentry *root;
+	struct inode *dir;
+	unsigned int do_plink;
+
+	TraceEnter();
+
+	if (unlikely(!(sb->s_flags & MS_RDONLY)
+		     && !br_writable(sbr_perm(sb, 0))))
+		Warn("first branch should be rw\n");
+
+	err = 0;
+	root = sb->s_root;
+	dir = sb->s_root->d_inode;
+	do_plink = au_flag_test(sb, AuFlag_PLINK);
+	bend = sbend(sb);
+	for (bindex = 0; !err && bindex <= bend; bindex++) {
+		struct inode *h_dir;
+		int skip;
+
+		skip = 0;
+		h_dir = au_h_iptr_i(dir, bindex);
+		br = stobr(sb, bindex);
+		br_wh_read_lock(br);
+		switch (br->br_perm) {
+		case AuBr_RR:
+		case AuBr_RO:
+		case AuBr_RRWH:
+		case AuBr_ROWH:
+			skip = (!br->br_wh && !br->br_plink);
+			break;
+
+		case AuBr_RWNoLinkWH:
+			skip = !br->br_wh;
+			if (skip) {
+				if (do_plink)
+					skip = !!br->br_plink;
+				else
+					skip = !br->br_plink;
+			}
+			break;
+
+		case AuBr_RW:
+			skip = !!br->br_wh;
+			if (skip) {
+				if (do_plink)
+					skip = !!br->br_plink;
+				else
+					skip = !br->br_plink;
+			}
+			break;
+
+		default:
+			BUG();
+		}
+		br_wh_read_unlock(br);
+
+		if (skip)
+			continue;
+
+		hdir_lock(h_dir, dir, bindex);
+		br_wh_write_lock(br);
+		err = init_wh(au_h_dptr_i(root, bindex), br,
+			      au_nfsmnt(sb, bindex), sb);
+		br_wh_write_unlock(br);
+		hdir_unlock(h_dir, dir, bindex);
+	}
+
+	TraceErr(err);
+	return err;
+}
+
+int au_do_opts_mount(struct super_block *sb, struct opts *opts)
+{
+	int err, do_refresh;
+	struct inode *dir;
+	struct opt *opt;
+	unsigned int flags, given;
+	struct opt_xino *opt_xino;
+	aufs_bindex_t bend, bindex;
+
+	TraceEnter();
+	SiMustWriteLock(sb);
+	DiMustWriteLock(sb->s_root);
+	dir = sb->s_root->d_inode;
+	IiMustWriteLock(dir);
+
+	err = 0;
+	given = 0;
+	opt_xino = NULL;
+	opt = opts->opt;
+	while (err >= 0 && opt->type != Opt_tail)
+		err = au_do_opt_simple(sb, opt++, /*remount*/0, &given);
+	if (err > 0)
+		err = 0;
+	else if (unlikely(err < 0))
+		goto out;
+
+	/* disable them temporary */
+	flags = au_flag_test(sb, AuFlag_XINO | AuMask_UDBA | AuFlag_DLGT);
+	au_flag_clr(sb, AuFlag_XINO | AuFlag_DLGT);
+	udba_set(sb, AuFlag_UDBA_REVAL);
+
+	do_refresh = 0;
+	opt = opts->opt;
+	while (err >= 0 && opt->type != Opt_tail)
+		err = au_do_opt_br(sb, opt++, /*remount*/0, &do_refresh);
+	if (err > 0)
+		err = 0;
+	else if (unlikely(err < 0))
+		goto out;
+
+	bend = sbend(sb);
+	if (unlikely(bend < 0)) {
+		err = -EINVAL;
+		Err("no branches\n");
+		goto out;
+	}
+
+	if (flags & AuFlag_XINO)
+		au_flag_set(sb, AuFlag_XINO);
+	opt = opts->opt;
+	while (!err && opt->type != Opt_tail)
+		err = au_do_opt_xino(sb, opt++, /*remount*/0, &opt_xino);
+	if (unlikely(err))
+		goto out;
+
+	//todo: test this error case.
+	err = verify_opts(sb, /*remount*/0);
+	DEBUG_ON(err);
+	if (unlikely(err))
+		goto out;
+
+	/* enable xino */
+	if (au_flag_test(sb, AuFlag_XINO) && !opt_xino) {
+		struct file *xino_file = xino_def(sb);
+		err = PTR_ERR(xino_file);
+		if (IS_ERR(xino_file))
+			goto out;
+
+		err = 0;
+		for (bindex = 0; !err && bindex <= bend; bindex++)
+			err = xino_init(sb, bindex, xino_file,
+					/*do_test*/bindex);
+		fput(xino_file);
+		if (unlikely(err))
+			goto out;
+	}
+
+	/* restore hinotify */
+	udba_set(sb, flags & AuMask_UDBA);
+	if (flags & AuFlag_UDBA_INOTIFY)
+		au_reset_hinotify(dir, au_hi_flags(dir, 1) & ~AUFS_HI_XINO);
+
+	/* restore dlgt */
+	if (flags & AuFlag_DLGT)
+		au_flag_set(sb, AuFlag_DLGT);
+
+ out:
+	TraceErr(err);
+	return err;
+}
+
+int au_do_opts_remount(struct super_block *sb, struct opts *opts,
+		       int *do_refresh, unsigned int *given)
+{
+	int err, rerr;
+	struct inode *dir;
+	struct opt_xino *opt_xino;
+	struct opt *opt;
+	unsigned int dlgt;
+
+	TraceEnter();
+	SiMustWriteLock(sb);
+	DiMustWriteLock(sb->s_root);
+	dir = sb->s_root->d_inode;
+	IiMustWriteLock(dir);
+	//DEBUG_ON(au_flag_test(sb, AuFlag_UDBA_INOTIFY));
+
+	err = 0;
+	*do_refresh = 0;
+	*given = 0;
+	dlgt = au_flag_test(sb, AuFlag_DLGT);
+	opt_xino = NULL;
+	opt = opts->opt;
+	while (err >= 0 && opt->type != Opt_tail) {
+		err = au_do_opt_simple(sb, opt, /*remount*/1, given);
+
+		/* disable it temporary */
+		dlgt = au_flag_test(sb, AuFlag_DLGT);
+		au_flag_clr(sb, AuFlag_DLGT);
+
+		if (!err)
+			err = au_do_opt_br(sb, opt, /*remount*/1, do_refresh);
+		if (!err)
+			err = au_do_opt_xino(sb, opt, /*remount*/1, &opt_xino);
+
+		/* restore it */
+		au_flag_set(sb, dlgt);
+		opt++;
+	}
+	if (err > 0)
+		err = 0;
+	TraceErr(err);
+
+	/* go on if err */
+
+	//todo: test this error case.
+	au_flag_clr(sb, AuFlag_DLGT);
+	rerr = verify_opts(sb, /*remount*/1);
+	au_flag_set(sb, dlgt);
+
+	/* they are handled by the caller */
+	if (!*do_refresh)
+		*do_refresh = !!((*given & AuMask_UDBA)
+				 || au_flag_test(sb, AuFlag_XINO));
+
+	TraceErr(err);
+	return err;
+}
diff --git a/fs/aufs/opts.h b/fs/aufs/opts.h
new file mode 100755
index 0000000..16c1a6a
--- /dev/null
+++ b/fs/aufs/opts.h
@@ -0,0 +1,96 @@
+/*
+ * Copyright (C) 2005, 2006, 2007 Junjiro Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+/* $Id: opts.h,v 1.13 2007/05/14 06:27:18 sfjro Exp $ */
+
+#ifndef __AUFS_OPTS_H__
+#define __AUFS_OPTS_H__
+
+#ifdef __KERNEL__
+
+#include <linux/fs.h>
+#include <linux/namei.h>
+#include <linux/version.h>
+#include <linux/aufs_type.h>
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,22)
+typedef const char* au_parser_pattern_t;
+#else
+typedef char* au_parser_pattern_t;
+#endif
+
+/* ---------------------------------------------------------------------- */
+
+struct opt_add {
+	aufs_bindex_t		bindex;
+	char			*path;
+	int			perm;
+	struct nameidata	nd;
+};
+
+struct opt_del {
+	char		*path;
+	struct dentry	*h_root;
+};
+
+struct opt_mod {
+	char		*path;
+	int		perm;
+	struct dentry	*h_root;
+};
+
+struct opt_xino {
+	char		*path;
+	struct file	*file;
+};
+
+struct opt {
+	int type;
+	union {
+		struct opt_xino	xino;
+		struct opt_add	add;
+		struct opt_del	del;
+		struct opt_mod	mod;
+		int		dirwh;
+		int		rdcache;
+		int		deblk;
+		int		nhash;
+		int		udba;
+		int		coo;
+	};
+};
+
+struct opts {
+	struct opt	*opt;
+	int		max_opt;
+};
+
+/* ---------------------------------------------------------------------- */
+
+int br_perm_str(char *p, unsigned int len, int brperm);
+au_parser_pattern_t udba_str(int udba);
+void udba_set(struct super_block *sb, unsigned int flg);
+//au_parser_pattern_t coo_str(int coo);
+void au_free_opts(struct opts *opts);
+int au_parse_opts(struct super_block *sb, char *str, struct opts *opts);
+int au_do_opts_mount(struct super_block *sb, struct opts *opts);
+int au_do_opts_remount(struct super_block *sb, struct opts *opts,
+		       int *do_refresh, unsigned int *given);
+
+#endif /* __KERNEL__ */
+#endif /* __AUFS_OPTS_H__ */
diff --git a/fs/aufs/plink.c b/fs/aufs/plink.c
new file mode 100755
index 0000000..0e520af
--- /dev/null
+++ b/fs/aufs/plink.c
@@ -0,0 +1,331 @@
+/*
+ * Copyright (C) 2007 Junjiro Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+/* $Id: plink.c,v 1.4 2007/05/14 03:39:10 sfjro Exp $ */
+
+#include "aufs.h"
+
+struct pseudo_link {
+	struct list_head list;
+	struct inode *inode;
+};
+
+#ifdef CONFIG_AUFS_DEBUG
+void au_list_plink(struct super_block *sb)
+{
+	struct aufs_sbinfo *sbinfo;
+	struct list_head *plink_list;
+	struct pseudo_link *plink;
+
+	TraceEnter();
+	SiMustAnyLock(sb);
+	DEBUG_ON(!au_flag_test(sb, AuFlag_PLINK));
+
+	sbinfo = stosi(sb);
+	plink_list = &sbinfo->si_plink;
+	spin_lock(&sbinfo->si_plink_lock);
+	list_for_each_entry(plink, plink_list, list)
+		Dbg("%lu\n", plink->inode->i_ino);
+	spin_unlock(&sbinfo->si_plink_lock);
+}
+#endif
+
+int au_is_plinked(struct super_block *sb, struct inode *inode)
+{
+	int found;
+	struct aufs_sbinfo *sbinfo;
+	struct list_head *plink_list;
+	struct pseudo_link *plink;
+
+	LKTRTrace("i%lu\n", inode->i_ino);
+	SiMustAnyLock(sb);
+	DEBUG_ON(!au_flag_test(sb, AuFlag_PLINK));
+
+	found = 0;
+	sbinfo = stosi(sb);
+	plink_list = &sbinfo->si_plink;
+	spin_lock(&sbinfo->si_plink_lock);
+	list_for_each_entry(plink, plink_list, list)
+		if (plink->inode == inode) {
+			found = 1;
+			break;
+		}
+	spin_unlock(&sbinfo->si_plink_lock);
+	return found;
+}
+
+// 20 is max digits length of ulong 64
+#define PLINK_NAME_LEN	((20 + 1) * 2)
+
+static int plink_name(char *name, int len, struct inode *inode,
+		      aufs_bindex_t bindex)
+{
+	int rlen;
+	struct inode *h_inode;
+
+	LKTRTrace("i%lu, b%d\n", inode->i_ino, bindex);
+	DEBUG_ON(len != PLINK_NAME_LEN);
+	h_inode = au_h_iptr_i(inode, bindex);
+	DEBUG_ON(!h_inode);
+	rlen = snprintf(name, len, "%lu.%lu", inode->i_ino, h_inode->i_ino);
+	DEBUG_ON(rlen >= len);
+	return rlen;
+}
+
+struct dentry *lkup_plink(struct super_block *sb, aufs_bindex_t bindex,
+			  struct inode *inode)
+{
+	struct dentry *h_dentry, *h_parent;
+	struct aufs_branch *br;
+	struct inode *h_dir;
+	char tgtname[PLINK_NAME_LEN];
+	int len;
+	struct lkup_args lkup;
+
+	LKTRTrace("b%d, i%lu\n", bindex, inode->i_ino);
+	br = stobr(sb, bindex);
+	h_parent = br->br_plink;
+	DEBUG_ON(!h_parent);
+	h_dir = h_parent->d_inode;
+	DEBUG_ON(!h_dir);
+
+	len = plink_name(tgtname, sizeof(tgtname), inode, bindex);
+
+	// always superio.
+	lkup.nfsmnt = au_do_nfsmnt(br->br_mnt);
+	lkup.dlgt = need_dlgt(sb);
+	hi_lock_whplink(h_dir);
+	h_dentry = sio_lkup_one(tgtname, h_parent, len, &lkup);
+	i_unlock(h_dir);
+	return h_dentry;
+}
+
+static int do_whplink(char *tgt, int len, struct dentry *h_parent,
+		      struct dentry *h_dentry, struct vfsmount *nfsmnt,
+		      struct super_block *sb)
+{
+	int err;
+	struct dentry *h_tgt;
+	struct inode *h_dir;
+	struct lkup_args lkup = {
+		.nfsmnt = nfsmnt,
+		.dlgt	= need_dlgt(sb)
+	};
+
+	h_tgt = lkup_one(tgt, h_parent, len, &lkup);
+	err = PTR_ERR(h_tgt);
+	if (IS_ERR(h_tgt))
+		goto out;
+
+	err = 0;
+	h_dir = h_parent->d_inode;
+	if (unlikely(h_tgt->d_inode && h_tgt->d_inode != h_dentry->d_inode))
+		err = vfsub_unlink(h_dir, h_tgt, lkup.dlgt);
+	if (!err && !h_tgt->d_inode) {
+		err = vfsub_link(h_dentry, h_dir, h_tgt, lkup.dlgt);
+		//inode->i_nlink++;
+	}
+	dput(h_tgt);
+
+ out:
+	TraceErr(err);
+	return err;
+}
+
+struct do_whplink_args {
+	int *errp;
+	char *tgt;
+	int len;
+	struct dentry *h_parent;
+	struct dentry *h_dentry;
+	struct vfsmount *nfsmnt;
+	struct super_block *sb;
+};
+
+static void call_do_whplink(void *args)
+{
+	struct do_whplink_args *a = args;
+	*a->errp = do_whplink(a->tgt, a->len, a->h_parent, a->h_dentry,
+			      a->nfsmnt, a->sb);
+}
+
+static int whplink(struct dentry *h_dentry, struct inode *inode,
+		   aufs_bindex_t bindex, struct super_block *sb)
+{
+	int err, len;
+	struct aufs_branch *br;
+	struct dentry *h_parent;
+	struct inode *h_dir;
+	char tgtname[PLINK_NAME_LEN];
+
+	LKTRTrace("%.*s\n", DLNPair(h_dentry));
+	br = stobr(inode->i_sb, bindex);
+	h_parent = br->br_plink;
+	DEBUG_ON(!h_parent);
+	h_dir = h_parent->d_inode;
+	DEBUG_ON(!h_dir);
+
+	len = plink_name(tgtname, sizeof(tgtname), inode, bindex);
+
+	// always superio.
+	hi_lock_whplink(h_dir);
+	if (!is_au_wkq(current)) {
+		struct do_whplink_args args = {
+			.errp		= &err,
+			.tgt		= tgtname,
+			.len		= len,
+			.h_parent	= h_parent,
+			.h_dentry	= h_dentry,
+			.nfsmnt		= au_do_nfsmnt(br->br_mnt),
+			.sb		= sb
+		};
+		au_wkq_wait(call_do_whplink, &args, /*dlgt*/0);
+	} else
+		err = do_whplink(tgtname, len, h_parent, h_dentry,
+				 au_do_nfsmnt(br->br_mnt), sb);
+	i_unlock(h_dir);
+
+	TraceErr(err);
+	return err;
+}
+
+void append_plink(struct super_block *sb, struct inode *inode,
+		  struct dentry *h_dentry, aufs_bindex_t bindex)
+{
+	struct aufs_sbinfo *sbinfo;
+	struct list_head *plink_list;
+	struct pseudo_link *plink;
+	int found, err, cnt;
+
+	LKTRTrace("i%lu\n", inode->i_ino);
+	SiMustAnyLock(sb);
+	DEBUG_ON(!au_flag_test(sb, AuFlag_PLINK));
+
+	cnt = 0;
+	found = 0;
+	sbinfo = stosi(sb);
+	plink_list = &sbinfo->si_plink;
+	spin_lock(&sbinfo->si_plink_lock);
+	list_for_each_entry(plink, plink_list, list) {
+		cnt++;
+		if (plink->inode == inode) {
+			found = 1;
+			break;
+		}
+	}
+
+	err = 0;
+	if (!found) {
+		struct pseudo_link *plink;
+
+		plink = kmalloc(sizeof(*plink), GFP_ATOMIC);
+		if (plink) {
+			plink->inode = igrab(inode);
+			list_add(&plink->list, plink_list);
+			cnt++;
+		} else
+			err = -ENOMEM;
+	}
+	spin_unlock(&sbinfo->si_plink_lock);
+
+	if (!err)
+		err = whplink(h_dentry, inode, bindex, sb);
+
+	if (unlikely(cnt > 100))
+		Warn1("unexpectedly many pseudo links, %d\n", cnt);
+	if (unlikely(err))
+		Warn("err %d, damaged pseudo link. ignored.\n", err);
+}
+
+static void do_put_plink(struct pseudo_link *plink, int do_del)
+{
+	TraceEnter();
+
+	iput(plink->inode);
+	if (do_del)
+		list_del(&plink->list);
+	kfree(plink);
+}
+
+void au_put_plink(struct super_block *sb)
+{
+	struct aufs_sbinfo *sbinfo;
+	struct list_head *plink_list;
+	struct pseudo_link *plink, *tmp;
+
+	TraceEnter();
+	SiMustWriteLock(sb);
+	DEBUG_ON(!au_flag_test(sb, AuFlag_PLINK));
+
+	sbinfo = stosi(sb);
+	plink_list = &sbinfo->si_plink;
+	//spin_lock(&sbinfo->si_plink_lock);
+	list_for_each_entry_safe(plink, tmp, plink_list, list)
+		do_put_plink(plink, 0);
+	INIT_LIST_HEAD(plink_list);
+	//spin_unlock(&sbinfo->si_plink_lock);
+}
+
+void half_refresh_plink(struct super_block *sb, aufs_bindex_t br_id)
+{
+	struct aufs_sbinfo *sbinfo;
+	struct list_head *plink_list;
+	struct pseudo_link *plink, *tmp;
+	struct inode *inode;
+	aufs_bindex_t bstart, bend, bindex;
+	int do_put;
+
+	TraceEnter();
+	SiMustWriteLock(sb);
+	DEBUG_ON(!au_flag_test(sb, AuFlag_PLINK));
+
+	sbinfo = stosi(sb);
+	plink_list = &sbinfo->si_plink;
+	//spin_lock(&sbinfo->si_plink_lock);
+	list_for_each_entry_safe(plink, tmp, plink_list, list) {
+		do_put = 0;
+		inode = igrab(plink->inode);
+		ii_write_lock_child(inode);
+		bstart = ibstart(inode);
+		bend = ibend(inode);
+		if (bstart >= 0) {
+			for (bindex = bstart; bindex <= bend; bindex++) {
+				if (!au_h_iptr_i(inode, bindex)
+				    || itoid_index(inode, bindex) != br_id)
+					continue;
+				set_h_iptr(inode, bindex, NULL, 0);
+				do_put = 1;
+				break;
+			}
+		} else
+			do_put_plink(plink, 1);
+
+		if (do_put) {
+			for (bindex = bstart; bindex <= bend; bindex++)
+				if (au_h_iptr_i(inode, bindex)) {
+					do_put = 0;
+					break;
+				}
+			if (do_put)
+				do_put_plink(plink, 1);
+		}
+		ii_write_unlock(inode);
+		iput(inode);
+	}
+	//spin_unlock(&sbinfo->si_plink_lock);
+}
diff --git a/fs/aufs/sbinfo.c b/fs/aufs/sbinfo.c
new file mode 100755
index 0000000..55cb64c
--- /dev/null
+++ b/fs/aufs/sbinfo.c
@@ -0,0 +1,173 @@
+/*
+ * Copyright (C) 2005, 2006, 2007 Junjiro Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+/* $Id: sbinfo.c,v 1.30 2007/05/14 03:39:31 sfjro Exp $ */
+
+#include "aufs.h"
+
+struct aufs_sbinfo *stosi(struct super_block *sb)
+{
+	struct aufs_sbinfo *sbinfo;
+	sbinfo = sb->s_fs_info;
+	//DEBUG_ON(sbinfo->si_bend < 0);
+	return sbinfo;
+}
+
+aufs_bindex_t sbend(struct super_block *sb)
+{
+	SiMustAnyLock(sb);
+	return stosi(sb)->si_bend;
+}
+
+struct aufs_branch *stobr(struct super_block *sb, aufs_bindex_t bindex)
+{
+	SiMustAnyLock(sb);
+	DEBUG_ON(bindex < 0 || sbend(sb) < bindex
+		 || !stosi(sb)->si_branch[0 + bindex]);
+	return stosi(sb)->si_branch[0 + bindex];
+}
+
+int au_sigen(struct super_block *sb)
+{
+	SiMustAnyLock(sb);
+	return stosi(sb)->si_generation;
+}
+
+int au_sigen_inc(struct super_block *sb)
+{
+	int gen;
+
+	SiMustWriteLock(sb);
+	gen = ++stosi(sb)->si_generation;
+	au_update_digen(sb->s_root);
+	au_update_iigen(sb->s_root->d_inode);
+	sb->s_root->d_inode->i_version++;
+	return gen;
+}
+
+int find_bindex(struct super_block *sb, struct aufs_branch *br)
+{
+	aufs_bindex_t bindex, bend;
+
+	bend = sbend(sb);
+	for (bindex = 0; bindex <= bend; bindex++)
+		if (stobr(sb, bindex) == br)
+			return bindex;
+	return -1;
+}
+
+/* ---------------------------------------------------------------------- */
+
+/* dentry and super_block lock. call at entry point */
+void aufs_read_lock(struct dentry *dentry, int flags)
+{
+	si_read_lock(dentry->d_sb);
+	if (flags & AUFS_D_WLOCK)
+		di_write_lock_child(dentry);
+	else
+		di_read_lock_child(dentry, flags);
+}
+
+void aufs_read_unlock(struct dentry *dentry, int flags)
+{
+	if (flags & AUFS_D_WLOCK)
+		di_write_unlock(dentry);
+	else
+		di_read_unlock(dentry, flags);
+	si_read_unlock(dentry->d_sb);
+}
+
+void aufs_write_lock(struct dentry *dentry)
+{
+	//au_wkq_wait_nwtask();
+	si_write_lock(dentry->d_sb);
+	di_write_lock_child(dentry);
+}
+
+void aufs_write_unlock(struct dentry *dentry)
+{
+	di_write_unlock(dentry);
+	si_write_unlock(dentry->d_sb);
+	//au_wkq_wait_nwtask();
+}
+
+void aufs_read_and_write_lock2(struct dentry *d1, struct dentry *d2, int isdir)
+{
+	DEBUG_ON(d1 == d2 || d1->d_sb != d2->d_sb);
+	si_read_lock(d1->d_sb);
+	di_write_lock2_child(d1, d2, isdir);
+}
+
+void aufs_read_and_write_unlock2(struct dentry *d1, struct dentry *d2)
+{
+	DEBUG_ON(d1 == d2 || d1->d_sb != d2->d_sb);
+	di_write_unlock2(d1, d2);
+	si_read_unlock(d1->d_sb);
+}
+
+/* ---------------------------------------------------------------------- */
+
+aufs_bindex_t new_br_id(struct super_block *sb)
+{
+	aufs_bindex_t br_id;
+
+	TraceEnter();
+	SiMustWriteLock(sb);
+
+	while (1) {
+		br_id = ++stosi(sb)->si_last_br_id;
+		if (br_id && find_brindex(sb, br_id) < 0)
+			return br_id;
+	}
+}
+
+/* ---------------------------------------------------------------------- */
+
+#ifdef CONFIG_AUFS_SYSAUFS
+static int make_xino(struct seq_file *seq, struct sysaufs_args *args,
+		    int *do_size)
+{
+	int err;
+	struct super_block *sb = args->sb;
+	aufs_bindex_t bindex, bend;
+	struct file *xf;
+	struct inode *xi;
+
+	TraceEnter();
+	DEBUG_ON(args->index != SysaufsSb_XINO);
+	SiMustReadLock(sb);
+
+	*do_size = 0;
+	err = seq_printf(seq, "%d %lu\n", sizeof(struct xino),
+			 atomic_long_read(&stosi(sb)->si_xino));
+	bend = sbend(sb);
+	for (bindex = 0; !err && bindex <= bend; bindex++) {
+		xf = stobr(sb, bindex)->br_xino;
+		xi = xf->f_dentry->d_inode;
+		err = seq_printf(seq, "%d: %d, %Lux%d %Ld\n",
+				 bindex, file_count(xf),
+				 (u64)xi->i_blocks, 1 << xi->i_blkbits,
+				 i_size_read(xi));
+	}
+	return err;
+}
+
+sysaufs_op au_si_ops[] = {
+	[SysaufsSb_XINO] = make_xino
+};
+#endif
diff --git a/fs/aufs/super.c b/fs/aufs/super.c
new file mode 100755
index 0000000..c1123f8
--- /dev/null
+++ b/fs/aufs/super.c
@@ -0,0 +1,716 @@
+/*
+ * Copyright (C) 2005, 2006, 2007 Junjiro Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+/* $Id: super.c,v 1.50 2007/05/14 03:39:42 sfjro Exp $ */
+
+#include <linux/module.h>
+#include <linux/seq_file.h>
+#include <linux/statfs.h>
+#include "aufs.h"
+
+/*
+ * super_operations
+ */
+static struct inode *aufs_alloc_inode(struct super_block *sb)
+{
+	struct aufs_icntnr *c;
+
+	TraceEnter();
+
+	c = cache_alloc_icntnr();
+	//if (LktrCond) {cache_free_icntnr(c); c = NULL;}
+	if (c) {
+		inode_init_once(&c->vfs_inode);
+		c->vfs_inode.i_version = 1; //sigen(sb);
+		c->iinfo.ii_hinode = NULL;
+		return &c->vfs_inode;
+	}
+	return NULL;
+}
+
+static void aufs_destroy_inode(struct inode *inode)
+{
+	LKTRTrace("i%lu\n", inode->i_ino);
+	au_iinfo_fin(inode);
+	cache_free_icntnr(container_of(inode, struct aufs_icntnr, vfs_inode));
+}
+
+//todo: how about merge with alloc_inode()?
+static void aufs_read_inode(struct inode *inode)
+{
+	int err;
+
+	LKTRTrace("i%lu\n", inode->i_ino);
+
+	err = au_iinfo_init(inode);
+	//if (LktrCond) err = -1;
+	if (!err) {
+		inode->i_version++;
+		inode->i_op = &aufs_iop;
+		inode->i_fop = &aufs_file_fop;
+		inode->i_mapping->a_ops = &aufs_aop;
+		return; /* success */
+	}
+
+	LKTRTrace("intializing inode info failed(%d)\n", err);
+	make_bad_inode(inode);
+}
+
+int au_show_brs(struct seq_file *seq, struct super_block *sb)
+{
+	int err;
+	aufs_bindex_t bindex, bend;
+	char a[16];
+	struct dentry *root;
+
+	TraceEnter();
+	SiMustAnyLock(sb);
+	root = sb->s_root;
+	DiMustAnyLock(root);
+
+	err = 0;
+	bend = sbend(sb);
+	for (bindex = 0; !err && bindex <= bend; bindex++) {
+		err = br_perm_str(a, sizeof(a), sbr_perm(sb, bindex));
+		if (!err)
+			err = seq_path(seq, sbr_mnt(sb, bindex),
+				       au_h_dptr_i(root, bindex), au_esc_chars);
+		if (err > 0)
+			err = seq_printf(seq, "=%s", a);
+		if (!err && bindex != bend)
+			err = seq_putc(seq, ':');
+	}
+
+	TraceErr(err);
+	return err;
+}
+
+static int aufs_show_options(struct seq_file *m, struct vfsmount *mnt)
+{
+	int err, n;
+	struct super_block *sb;
+	struct aufs_sbinfo *sbinfo;
+	struct dentry *root;
+	struct file *xino;
+
+	TraceEnter();
+
+	sb = mnt->mnt_sb;
+	root = sb->s_root;
+	aufs_read_lock(root, !AUFS_I_RLOCK);
+	if (au_flag_test(sb, AuFlag_XINO)) {
+		err = seq_puts(m, ",xino=");
+		if (unlikely(err))
+			goto out;
+		xino = stobr(sb, 0)->br_xino;
+		err = seq_path(m, xino->f_vfsmnt, xino->f_dentry, au_esc_chars);
+		if (unlikely(err <= 0))
+			goto out;
+		err = 0;
+
+#define Deleted "\\040(deleted)"
+		m->count -= sizeof(Deleted) - 1;
+		DEBUG_ON(memcmp(m->buf + m->count, Deleted,
+				sizeof(Deleted) - 1));
+#undef Deleted
+	} else
+		err = seq_puts(m, ",noxino");
+
+	n = au_flag_test(sb, AuFlag_PLINK);
+	if (unlikely(!err && (AuDefFlags & AuFlag_PLINK) != n))
+		err = seq_printf(m, ",%splink", n ? "" : "no");
+	n = au_flag_test_udba(sb);
+	if (unlikely(!err && (AuDefFlags & AuMask_UDBA) != n))
+		err = seq_printf(m, ",udba=%s", udba_str(n));
+	n = au_flag_test(sb, AuFlag_ALWAYS_DIROPQ);
+	if (unlikely(!err && (AuDefFlags & AuFlag_ALWAYS_DIROPQ) != n))
+		err = seq_printf(m, ",diropq=%c", n ? 'a' : 'w');
+	n = au_flag_test(sb, AuFlag_DLGT);
+	if (unlikely(!err && (AuDefFlags & AuFlag_DLGT) != n))
+		err = seq_printf(m, ",%sdlgt", n ? "" : "no");
+	n = au_flag_test(sb, AuFlag_WARN_PERM);
+	if (unlikely(!err && (AuDefFlags & AuFlag_WARN_PERM) != n))
+		err = seq_printf(m, ",%swarn_perm", n ? "" : "no");
+
+	sbinfo = stosi(sb);
+	n = sbinfo->si_dirwh;
+	if (unlikely(!err && n != AUFS_DIRWH_DEF))
+		err = seq_printf(m, ",dirwh=%d", n);
+	n = sbinfo->si_rdcache / HZ;
+	if (unlikely(!err && n != AUFS_RDCACHE_DEF))
+		err = seq_printf(m, ",rdcache=%d", n);
+#if 0
+	n = au_flag_test_coo(sb);
+	if (unlikely(!err && (AuDefFlags & AuMask_COO) != n))
+		err = seq_printf(m, ",coo=%s", coo_str(n));
+#endif
+
+	if (!err && !sysaufs_brs) {
+#ifdef CONFIG_AUFS_COMPAT
+		err = seq_puts(m, ",dirs=");
+#else
+		err = seq_puts(m, ",br:");
+#endif
+		if (!err)
+			err = au_show_brs(m, sb);
+	}
+
+ out:
+	aufs_read_unlock(root, !AUFS_I_RLOCK);
+	TraceErr(err);
+	if (err)
+		err = -E2BIG;
+	TraceErr(err);
+	return err;
+}
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,18)
+#define StatfsLock(d)	aufs_read_lock((d)->d_sb->s_root, 0)
+#define StatfsUnlock(d)	aufs_read_unlock((d)->d_sb->s_root, 0)
+#define StatfsArg(d)	au_h_dptr((d)->d_sb->s_root)
+#define StatfsHInode(d)	(StatfsArg(d)->d_inode)
+#define StatfsSb(d)	((d)->d_sb)
+static int aufs_statfs(struct dentry *arg, struct kstatfs *buf)
+#else
+#define StatfsLock(s)	si_read_lock(s)
+#define StatfsUnlock(s)	si_read_unlock(s)
+#define StatfsArg(s)	sbr_sb(s, 0)
+#define StatfsHInode(s)	(StatfsArg(s)->s_root->d_inode)
+#define StatfsSb(s)	(s)
+static int aufs_statfs(struct super_block *arg, struct kstatfs *buf)
+#endif
+{
+	int err;
+
+	TraceEnter();
+
+	StatfsLock(arg);
+	err = vfsub_statfs(StatfsArg(arg), buf, need_dlgt(StatfsSb(arg)));
+	//if (LktrCond) err = -1;
+	StatfsUnlock(arg);
+	if (!err) {
+		//buf->f_type = AUFS_SUPER_MAGIC;
+		buf->f_type = 0;
+		buf->f_namelen -= AUFS_WH_PFX_LEN;
+		memset(&buf->f_fsid, 0, sizeof(buf->f_fsid));
+	}
+	//buf->f_bsize = buf->f_blocks = buf->f_bfree = buf->f_bavail = -1;
+
+	TraceErr(err);
+	return err;
+}
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,18) || defined(UbuntuEdgy17Umount18)
+#define UmountBeginSb(mnt)	(mnt)->mnt_sb
+static void aufs_umount_begin(struct vfsmount *arg, int flags)
+#else
+#define UmountBeginSb(sb)	sb
+static void aufs_umount_begin(struct super_block *arg)
+#endif
+{
+	struct super_block *sb = UmountBeginSb(arg);
+
+	if (unlikely(!stosi(sb)))
+		return;
+
+	//au_wkq_wait_nwtask();
+	si_write_lock(sb);
+	if (au_flag_test(sb, AuFlag_PLINK)) {
+		au_put_plink(sb);
+		//kobj_umount(stosi(sb));
+	}
+#if 0
+	if (unlikely(au_flag_test(sb, AuFlag_UDBA_INOTIFY)))
+		shrink_dcache_sb(sb);
+#endif
+	si_write_unlock(sb);
+}
+
+static void free_sbinfo(struct aufs_sbinfo *sbinfo)
+{
+	TraceEnter();
+	DEBUG_ON(!sbinfo
+		 || !list_empty(&sbinfo->si_plink));
+
+	free_branches(sbinfo);
+	kfree(sbinfo->si_branch);
+	kfree(sbinfo);
+}
+
+/* final actions when unmounting a file system */
+static void aufs_put_super(struct super_block *sb)
+{
+	struct aufs_sbinfo *sbinfo;
+
+	TraceEnter();
+
+	sbinfo = stosi(sb);
+	if (unlikely(!sbinfo))
+		return;
+
+	sysaufs_del(sbinfo);
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,18) && !defined(UbuntuEdgy17Umount18)
+	// umount_begin() may not be called.
+	aufs_umount_begin(sb);
+#endif
+	free_sbinfo(sbinfo);
+}
+
+/* ---------------------------------------------------------------------- */
+
+/*
+ * refresh directories at remount time.
+ */
+static int do_refresh_dir(struct dentry *dentry, unsigned int flags)
+{
+	int err;
+	struct dentry *parent;
+	struct inode *inode;
+
+	LKTRTrace("%.*s\n", DLNPair(dentry));
+	inode = dentry->d_inode;
+	DEBUG_ON(!inode || !S_ISDIR(inode->i_mode));
+
+	di_write_lock_child(dentry);
+	parent = dget_parent(dentry);
+	di_read_lock_parent(parent, AUFS_I_RLOCK);
+	err = au_refresh_hdentry(dentry, S_IFDIR);
+	if (err >= 0) {
+		err = au_refresh_hinode(inode, dentry);
+		if (!err)
+			au_reset_hinotify(inode, flags);
+	}
+	if (unlikely(err))
+		Err("unrecoverable error %d\n", err);
+	di_read_unlock(parent, AUFS_I_RLOCK);
+	dput(parent);
+	di_write_unlock(dentry);
+
+	TraceErr(err);
+	return err;
+}
+
+static int test_dir(struct dentry *dentry, void *arg)
+{
+	return S_ISDIR(dentry->d_inode->i_mode);
+}
+
+static int refresh_dir(struct dentry *root, int sgen)
+{
+	int err, i, j, ndentry;
+	const unsigned int flags = au_hi_flags(root->d_inode, /*isdir*/1);
+	struct au_dcsub_pages dpages;
+	struct au_dpage *dpage;
+	struct dentry **dentries;
+
+	LKTRTrace("sgen %d\n", sgen);
+	SiMustWriteLock(root->d_sb);
+	DEBUG_ON(au_digen(root) != sgen);
+	DiMustWriteLock(root);
+
+	err = au_dpages_init(&dpages, GFP_KERNEL);
+	if (unlikely(err))
+		goto out;
+	err = au_dcsub_pages(&dpages, root, test_dir, NULL);
+	if (unlikely(err))
+		goto out_dpages;
+
+	DiMustNoWaiters(root);
+	IiMustNoWaiters(root->d_inode);
+	di_write_unlock(root);
+	for (i = 0; !err && i < dpages.ndpage; i++) {
+		dpage = dpages.dpages + i;
+		dentries = dpage->dentries;
+		ndentry = dpage->ndentry;
+		for (j = 0; !err && j < ndentry; j++) {
+			struct dentry *d;
+			d = dentries[j];
+			DEBUG_ON(!S_ISDIR(d->d_inode->i_mode)
+				 || IS_ROOT(d)
+				 || au_digen(d->d_parent) != sgen);
+			if (au_digen(d) != sgen)
+				err = do_refresh_dir(d, flags);
+		}
+	}
+	di_write_lock_child(root); /* aufs_write_lock() calls ..._child() */
+
+ out_dpages:
+	au_dpages_free(&dpages);
+ out:
+	TraceErr(err);
+	return err;
+}
+
+/* stop extra interpretation of errno in mount(8), and strange error messages */
+static int cvt_err(int err)
+{
+	TraceErr(err);
+
+	switch (err) {
+	case -ENOENT:
+	case -ENOTDIR:
+	case -EEXIST:
+	case -EIO:
+		err = -EINVAL;
+	}
+	return err;
+}
+
+/* protected by s_umount */
+static int aufs_remount_fs(struct super_block *sb, int *flags, char *data)
+{
+	int err, do_refresh;
+	struct dentry *root;
+	struct inode *inode;
+	struct opts opts;
+	unsigned int given, dlgt;
+
+	//au_debug_on();
+	LKTRTrace("flags 0x%x, data %s, len %d\n",
+		  *flags, data ? data : "NULL", data ? strlen(data) : 0);
+
+	err = 0;
+	if (unlikely(!data || !*data))
+		goto out; /* success */
+
+	err = -ENOMEM;
+	memset(&opts, 0, sizeof(opts));
+	opts.opt = (void*)__get_free_page(GFP_KERNEL);
+	//if (LktrCond) {free_page((unsigned long)opts.opt); opts.opt = NULL;}
+	if (unlikely(!opts.opt))
+		goto out;
+	opts.max_opt = PAGE_SIZE / sizeof(*opts.opt);
+
+	/* parse it before aufs lock */
+	err = au_parse_opts(sb, data, &opts);
+	//if (LktrCond) {au_free_opts(&opts); err = -1;}
+	if (unlikely(err))
+		goto out_opts;
+
+	root = sb->s_root;
+	inode = root->d_inode;
+	i_lock(inode);
+	aufs_write_lock(root);
+
+	//DbgSleep(3);
+
+	/* au_do_opts() may return an error */
+	do_refresh = 0;
+	given = 0;
+	err = au_do_opts_remount(sb, &opts, &do_refresh, &given);
+	//if (LktrCond) err = -1;
+	au_free_opts(&opts);
+
+	if (do_refresh) {
+		int rerr;
+		struct aufs_sbinfo *sbinfo;
+
+		dlgt = au_flag_test(sb, AuFlag_DLGT);
+		au_flag_clr(sb, AuFlag_DLGT);
+		au_sigen_inc(sb);
+		au_reset_hinotify(inode, au_hi_flags(inode, /*isdir*/1));
+		sbinfo = stosi(sb);
+		sbinfo->si_failed_refresh_dirs = 0;
+		rerr = refresh_dir(root, au_sigen(sb));
+		if (unlikely(rerr)) {
+			sbinfo->si_failed_refresh_dirs = 1;
+			Warn("Refreshing directories failed, ignores (%d)\n",
+			     rerr);
+		}
+		au_cpup_attr_all(inode);
+		au_flag_set(sb, dlgt);
+	}
+
+	aufs_write_unlock(root);
+	i_unlock(inode);
+	/* braces are added to stop a warning */
+	if (do_refresh) {
+		sysaufs_notify_remount();
+	}
+
+ out_opts:
+	free_page((unsigned long)opts.opt);
+ out:
+	err = cvt_err(err);
+	TraceErr(err);
+	//au_debug_off();
+	return err;
+}
+
+static struct super_operations aufs_sop = {
+	.alloc_inode	= aufs_alloc_inode,
+	.destroy_inode	= aufs_destroy_inode,
+	.read_inode	= aufs_read_inode,
+	//.dirty_inode	= aufs_dirty_inode,
+	//.write_inode	= aufs_write_inode,
+	//void (*put_inode) (struct inode *);
+	.drop_inode	= generic_delete_inode,
+	//.delete_inode	= aufs_delete_inode,
+	//.clear_inode	= aufs_clear_inode,
+
+	.show_options	= aufs_show_options,
+	.statfs		= aufs_statfs,
+
+	.put_super	= aufs_put_super,
+	//void (*write_super) (struct super_block *);
+	//int (*sync_fs)(struct super_block *sb, int wait);
+	//void (*write_super_lockfs) (struct super_block *);
+	//void (*unlockfs) (struct super_block *);
+	.remount_fs	= aufs_remount_fs,
+	// depends upon umount flags. also use put_super() (< 2.6.18)
+	.umount_begin	= aufs_umount_begin
+};
+
+/* ---------------------------------------------------------------------- */
+
+/*
+ * at first mount time.
+ */
+
+static int alloc_sbinfo(struct super_block *sb)
+{
+	struct aufs_sbinfo *sbinfo;
+
+	TraceEnter();
+
+	sbinfo = kmalloc(sizeof(*sbinfo), GFP_KERNEL);
+	//if (LktrCond) {kfree(sbinfo); sbinfo = NULL;}
+	if (unlikely(!sbinfo))
+		goto out;
+	sbinfo->si_branch = kzalloc(sizeof(*sbinfo->si_branch), GFP_KERNEL);
+	//if (LktrCond) {kfree(sbinfo->si_branch); sbinfo->si_branch = NULL;}
+	if (unlikely(!sbinfo->si_branch)) {
+		kfree(sbinfo);
+		goto out;
+	}
+	rw_init_wlock(&sbinfo->si_rwsem);
+	sbinfo->si_bend = -1;
+	atomic_long_set(&sbinfo->si_xino, AUFS_FIRST_INO);
+	spin_lock_init(&sbinfo->si_plink_lock);
+	INIT_LIST_HEAD(&sbinfo->si_plink);
+	init_lvma(sbinfo);
+	sbinfo->si_generation = 0;
+	sbinfo->si_last_br_id = 0;
+	sbinfo->si_failed_refresh_dirs = 0;
+	sbinfo->si_flags = 0;
+	sbinfo->si_dirwh = AUFS_DIRWH_DEF;
+	sbinfo->si_rdcache = AUFS_RDCACHE_DEF * HZ;
+	//atomic_set(&sbinfo->si_hinotify, 0);
+	//init_waitqueue_head(&sbinfo->si_hinotify_wq);
+
+	sb->s_fs_info = sbinfo;
+	au_flag_set(sb, AuDefFlags);
+#ifdef ForceInotify
+	udba_set(sb, AuFlag_UDBA_INOTIFY);
+#endif
+#ifdef ForceDlgt
+	au_flag_set(sb, AuFlag_DLGT);
+#endif
+#ifdef ForceNoPlink
+	au_flag_clr(sb, AuFlag_PLINK);
+#endif
+	return 0; /* success */
+
+ out:
+	TraceErr(-ENOMEM);
+	return -ENOMEM;
+}
+
+static int alloc_root(struct super_block *sb)
+{
+	int err;
+	struct inode *inode;
+	struct dentry *root;
+
+	TraceEnter();
+
+	err = -ENOMEM;
+	inode = iget(sb, AUFS_ROOT_INO);
+	//if (LktrCond) {iput(inode); inode = NULL;}
+	if (unlikely(!inode))
+		goto out;
+	err = PTR_ERR(inode);
+	if (IS_ERR(inode))
+		goto out;
+	err = -ENOMEM;
+	if (unlikely(is_bad_inode(inode)))
+		goto out_iput;
+
+	root = d_alloc_root(inode);
+	//if (LktrCond) {igrab(inode); dput(root); root = NULL;}
+	if (unlikely(!root))
+		goto out_iput;
+	err = PTR_ERR(root);
+	if (IS_ERR(root))
+		goto out_iput;
+
+	err = au_alloc_dinfo(root);
+	//if (LktrCond){rw_write_unlock(&dtodi(root)->di_rwsem);err=-1;}
+	if (!err) {
+		sb->s_root = root;
+		return 0; /* success */
+	}
+	dput(root);
+	goto out; /* do not iput */
+
+ out_iput:
+	iput(inode);
+ out:
+	TraceErr(err);
+	return err;
+
+}
+
+static int aufs_fill_super(struct super_block *sb, void *raw_data, int silent)
+{
+	int err;
+	struct dentry *root;
+	struct inode *inode;
+	struct opts opts;
+	char *arg = raw_data;
+
+	//au_debug_on();
+	if (unlikely(!arg || !*arg)) {
+		err = -EINVAL;
+		Err("no arg\n");
+		goto out;
+	}
+	LKTRTrace("%s, silent %d\n", arg, silent);
+
+	err = -ENOMEM;
+	memset(&opts, 0, sizeof(opts));
+	opts.opt = (void*)__get_free_page(GFP_KERNEL);
+	//if (LktrCond) {free_page((unsigned long)opts.opt); opts.opt = NULL;}
+	if (unlikely(!opts.opt))
+		goto out;
+	opts.max_opt = PAGE_SIZE / sizeof(*opts.opt);
+
+	err = alloc_sbinfo(sb);
+	//if (LktrCond) {si_write_unlock(sb);free_sbinfo(stosi(sb));err=-1;}
+	if (unlikely(err))
+		goto out_opts;
+	SiMustWriteLock(sb);
+	/* all timestamps always follow the ones on the branch */
+	sb->s_flags |= MS_NOATIME | MS_NODIRATIME;
+	sb->s_op = &aufs_sop;
+	au_init_export_op(sb);
+	//err = kobj_mount(stosi(sb));
+	//if (err)
+	//goto out_info;
+
+	err = alloc_root(sb);
+	//if (LktrCond) {rw_write_unlock(&dtodi(sb->s_root)->di_rwsem);
+	//dput(sb->s_root);sb->s_root=NULL;err=-1;}
+	if (unlikely(err)) {
+		DEBUG_ON(sb->s_root);
+		si_write_unlock(sb);
+		goto out_info;
+	}
+	root = sb->s_root;
+	DiMustWriteLock(root);
+	inode = root->d_inode;
+	inode->i_nlink = 2;
+
+	/*
+	 * actually we can parse options regardless aufs lock here.
+	 * but at remount time, parsing must be done before aufs lock.
+	 * so we follow the same rule.
+	 */
+	ii_write_lock_parent(inode);
+	aufs_write_unlock(root);
+	err = au_parse_opts(sb, arg, &opts);
+	//if (LktrCond) {au_free_opts(&opts); err = -1;}
+	if (unlikely(err))
+		goto out_root;
+
+	/* lock vfs_inode first, then aufs. */
+	i_lock(inode);
+	inode->i_op = &aufs_dir_iop;
+	inode->i_fop = &aufs_dir_fop;
+	aufs_write_lock(root);
+
+	sb->s_maxbytes = 0;
+	err = au_do_opts_mount(sb, &opts);
+	//if (LktrCond) err = -1;
+	au_free_opts(&opts);
+	if (unlikely(err))
+		goto out_unlock;
+	DEBUG_ON(!sb->s_maxbytes);
+
+	//DbgDentry(root);
+	aufs_write_unlock(root);
+	i_unlock(inode);
+	//DbgSb(sb);
+	goto out_opts; /* success */
+
+ out_unlock:
+	aufs_write_unlock(root);
+	i_unlock(inode);
+ out_root:
+	dput(root);
+	sb->s_root = NULL;
+ out_info:
+	free_sbinfo(stosi(sb));
+	sb->s_fs_info = NULL;
+ out_opts:
+	free_page((unsigned long)opts.opt);
+ out:
+	TraceErr(err);
+	err = cvt_err(err);
+	TraceErr(err);
+	//au_debug_off();
+	return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,18)
+static int aufs_get_sb(struct file_system_type *fs_type, int flags,
+		       const char *dev_name, void *raw_data,
+		       struct vfsmount *mnt)
+{
+	int err;
+
+	/* all timestamps always follow the ones on the branch */
+	//mnt->mnt_flags |= MNT_NOATIME | MNT_NODIRATIME;
+	err = get_sb_nodev(fs_type, flags, raw_data, aufs_fill_super, mnt);
+	if (!err) {
+		struct aufs_sbinfo *sbinfo = stosi(mnt->mnt_sb);
+		sbinfo->si_mnt = mnt;
+		sysaufs_add(sbinfo);
+	}
+	return err;
+}
+#else
+static struct super_block *aufs_get_sb(struct file_system_type *fs_type,
+				       int flags, const char *dev_name,
+				       void *raw_data)
+{
+	return get_sb_nodev(fs_type, flags, raw_data, aufs_fill_super);
+}
+#endif
+
+struct file_system_type aufs_fs_type = {
+	.name		= AUFS_FSTYPE,
+	.fs_flags	= FS_REVAL_DOT, // for UDBA and NFS branch
+	.get_sb		= aufs_get_sb,
+	.kill_sb	= generic_shutdown_super,
+	//no need to __module_get() and module_put().
+	.owner		= THIS_MODULE,
+};
diff --git a/fs/aufs/super.h b/fs/aufs/super.h
new file mode 100755
index 0000000..56ddee1
--- /dev/null
+++ b/fs/aufs/super.h
@@ -0,0 +1,339 @@
+/*
+ * Copyright (C) 2005, 2006, 2007 Junjiro Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+/* $Id: super.h,v 1.44 2007/05/14 03:39:54 sfjro Exp $ */
+
+#ifndef __AUFS_SUPER_H__
+#define __AUFS_SUPER_H__
+
+#ifdef __KERNEL__
+
+#include <linux/fs.h>
+#include <linux/version.h>
+#include <linux/aufs_type.h>
+#include "misc.h"
+#include "sysaufs.h"
+
+#ifdef CONFIG_AUFS_SYSAUFS
+/* entries under sysfs per mount-point */
+enum {SysaufsSb_XINO, /* SysaufsSb_PLINK, */ SysaufsSb_Last};
+struct sysaufs_sbinfo {
+	au_subsys_t		subsys;
+	struct sysaufs_entry	array[SysaufsSb_Last];
+};
+extern sysaufs_op au_si_ops[];
+#else
+struct sysaufs_sbinfo {};
+#endif
+
+struct aufs_sbinfo {
+	struct aufs_rwsem	si_rwsem;
+
+	/* branch management */
+	/* wrap around attack by superuser? No. */
+	int			si_generation;
+
+	/*
+	 * set true when refresh_dirs() at remount time failed.
+	 * then try refreshing dirs at access time again.
+	 * if it is false, refreshing dirs at access time is unnecesary
+	 */
+	unsigned int		si_failed_refresh_dirs:1;
+
+	aufs_bindex_t		si_bend;
+	aufs_bindex_t		si_last_br_id;
+	struct aufs_branch	**si_branch;
+
+	/* mount flags */
+	unsigned int		si_flags;
+
+	/* external inode number table */
+	atomic_long_t		si_xino;	// time bomb
+	//struct file		*si_xino_bmap;
+
+	/* readdir cache time, max, in HZ */
+	unsigned long		si_rdcache;
+
+	/*
+	 * If the number of whiteouts are larger than si_dirwh, leave all of
+	 * them after rename_whtmp to reduce the cost of rmdir(2).
+	 * future fsck.aufs or kernel thread will remove them later.
+	 * Otherwise, remove all whiteouts and the dir in rmdir(2).
+	 */
+	unsigned int		si_dirwh;
+
+	/* pseudo_link list */ // dirty
+	spinlock_t		si_plink_lock;
+	struct list_head	si_plink;
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,18)
+	/* super_blocks list is not exported */
+	struct list_head	si_list;
+	struct vfsmount		*si_mnt;	/* no get/put */
+#endif
+
+	/* sysfs */
+	struct sysaufs_sbinfo	si_sysaufs;
+
+#ifdef CONFIG_AUFS_HINOTIFY
+	/* hinotify */
+	//atomic_t		si_hinotify;
+	//wait_queue_head_t	si_hinotify_wq;
+#endif
+
+#ifdef CONFIG_AUFS_ROBR
+	/* locked vma list for mmap() */ // very dirty
+	spinlock_t		si_lvma_lock;
+	struct list_head	si_lvma;
+#endif
+};
+
+/* an entry in a xino file */
+struct xino {
+	ino_t ino;
+	//__u32 h_gen;
+} __attribute__ ((packed));
+
+//#define AuXino_INVALID_HGEN	(-1)
+
+/* ---------------------------------------------------------------------- */
+
+/* Mount flags */
+#define AuFlag_XINO		1
+#define AuFlag_ZXINO		(1 << 1)
+#define AuFlag_PLINK		(1 << 2)
+#define AuFlag_UDBA_NONE	(1 << 3)
+#define AuFlag_UDBA_REVAL	(1 << 4)
+#define AuFlag_UDBA_INOTIFY	(1 << 5)
+#define AuFlag_WARN_PERM	(1 << 6)
+#define AuFlag_COO_NONE		(1 << 7)
+#define AuFlag_COO_LEAF		(1 << 8)
+#define AuFlag_COO_ALL		(1 << 9)
+#define AuFlag_ALWAYS_DIROPQ	(1 << 10)
+#define AuFlag_DLGT		(1 << 11)
+
+#define AuMask_UDBA		(AuFlag_UDBA_NONE | AuFlag_UDBA_REVAL \
+				 | AuFlag_UDBA_INOTIFY)
+#define AuMask_COO		(AuFlag_COO_NONE | AuFlag_COO_LEAF \
+				 | AuFlag_COO_ALL)
+
+#ifdef CONFIG_AUFS_COMPAT
+#define AuDefFlag_DIROPQ	AuFlag_ALWAYS_DIROPQ
+#else
+#define AuDefFlag_DIROPQ	0
+#endif
+
+#define AuDefFlags_COMM		(AuFlag_XINO | AuFlag_UDBA_REVAL | AuFlag_WARN_PERM \
+				 | AuFlag_COO_NONE | AuDefFlag_DIROPQ)
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
+#define AuDefFlags		(AuDefFlags_COMM | AuFlag_PLINK)
+#else
+#define AuDefFlags		AuDefFlags_COMM
+#endif
+
+/* ---------------------------------------------------------------------- */
+
+/* flags for aufs_read_lock()/di_read_lock() */
+#define AUFS_D_WLOCK		1
+#define AUFS_I_RLOCK		2
+#define AUFS_I_WLOCK		4
+
+/* ---------------------------------------------------------------------- */
+
+/* super.c */
+int au_show_brs(struct seq_file *seq, struct super_block *sb);
+
+/* xino.c */
+struct file *xino_create(struct super_block *sb, char *fname, int silent,
+			 struct dentry *parent);
+ino_t xino_new_ino(struct super_block *sb);
+int xino_write0(struct super_block *sb, aufs_bindex_t bindex, ino_t h_ino);
+int xino_write(struct super_block *sb, aufs_bindex_t bindex, ino_t h_ino,
+	       struct xino *xino);
+int xino_read(struct super_block *sb, aufs_bindex_t bindex, ino_t h_ino,
+	      struct xino *xino);
+int xino_init(struct super_block *sb, aufs_bindex_t bindex,
+	      struct file *base_file, int do_test);
+struct opt_xino;
+int xino_set(struct super_block *sb, struct opt_xino *xino, int remount);
+int xino_clr(struct super_block *sb);
+struct file *xino_def(struct super_block *sb);
+
+/* sbinfo.c */
+struct aufs_sbinfo *stosi(struct super_block *sb);
+aufs_bindex_t sbend(struct super_block *sb);
+struct aufs_branch *stobr(struct super_block *sb, aufs_bindex_t bindex);
+int au_sigen(struct super_block *sb);
+int au_sigen_inc(struct super_block *sb);
+int find_bindex(struct super_block *sb, struct aufs_branch *br);
+
+void aufs_read_lock(struct dentry *dentry, int flags);
+void aufs_read_unlock(struct dentry *dentry, int flags);
+void aufs_write_lock(struct dentry *dentry);
+void aufs_write_unlock(struct dentry *dentry);
+void aufs_read_and_write_lock2(struct dentry *d1, struct dentry *d2, int isdir);
+void aufs_read_and_write_unlock2(struct dentry *d1, struct dentry *d2);
+
+aufs_bindex_t new_br_id(struct super_block *sb);
+
+/* ---------------------------------------------------------------------- */
+
+static inline const char *au_sbtype(struct super_block *sb)
+{
+	return sb->s_type->name;
+}
+
+static inline int au_is_aufs(struct super_block *sb)
+{
+	return !strcmp(au_sbtype(sb), AUFS_FSTYPE);
+}
+
+static inline int au_is_nfs(struct super_block *sb)
+{
+#if defined(CONFIG_NFS_FS) || defined(CONFIG_NFS_FS_MODULE)
+	return !strcmp(au_sbtype(sb), "nfs");
+#else
+	return 0;
+#endif
+}
+
+static inline int au_is_remote(struct super_block *sb)
+{
+	return au_is_nfs(sb);
+}
+
+#ifdef CONFIG_AUFS_EXPORT
+static inline void au_init_export_op(struct super_block *sb)
+{
+	extern struct export_operations aufs_export_op;
+	sb->s_export_op = &aufs_export_op;
+}
+
+static inline int au_is_nfsd(struct task_struct *tsk)
+{
+	return (!tsk->mm && !strcmp(tsk->comm, "nfsd"));
+}
+
+static inline void au_nfsd_lockdep_off(void)
+{
+	/* braces are added to stop a warning */
+	if (au_is_nfsd(current)) {
+		lockdep_off();
+	}
+}
+
+static inline void au_nfsd_lockdep_on(void)
+{
+	/* braces are added to stop a warning */
+	if (au_is_nfsd(current)) {
+		lockdep_on();
+	}
+}
+#else
+static inline int au_is_nfsd(struct task_struct *tsk)
+{
+	return 0;
+}
+static inline void au_init_export_op(struct super_block *sb)
+{
+	/* nothing */
+}
+#define au_nfsd_lockdep_off()	/* */
+#define au_nfsd_lockdep_on()	/* */
+#endif /* CONFIG_AUFS_EXPORT */
+
+static inline void init_lvma(struct aufs_sbinfo *sbinfo)
+{
+#ifdef CONFIG_AUFS_ROBR
+	spin_lock_init(&sbinfo->si_lvma_lock);
+	INIT_LIST_HEAD(&sbinfo->si_lvma);
+#else
+	/* nothing */
+#endif
+}
+
+/* limited support before 2.6.18 */
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,18)
+static inline void au_mntget(struct super_block *sb)
+{
+	mntget(stosi(sb)->si_mnt);
+}
+
+static inline void au_mntput(struct super_block *sb)
+{
+	mntput(stosi(sb)->si_mnt);
+}
+#else
+static inline void au_mntget(struct super_block *sb)
+{
+	/* empty */
+}
+
+static inline void au_mntput(struct super_block *sb)
+{
+	/* empty */
+}
+#endif
+
+/* ---------------------------------------------------------------------- */
+
+static inline void au_flag_set(struct super_block *sb, unsigned int flag)
+{
+	//SiMustWriteLock(sb);
+	stosi(sb)->si_flags |= flag;
+}
+
+static inline void au_flag_clr(struct super_block *sb, unsigned int flag)
+{
+	//SiMustWriteLock(sb);
+	stosi(sb)->si_flags &= ~flag;
+}
+
+static inline
+unsigned int au_flag_test(struct super_block *sb, unsigned int flag)
+{
+	//SiMustAnyLock(sb);
+	return stosi(sb)->si_flags & flag;
+}
+
+static inline unsigned int au_flag_test_udba(struct super_block *sb)
+{
+	return au_flag_test(sb, AuMask_UDBA);
+}
+
+static inline unsigned int au_flag_test_coo(struct super_block *sb)
+{
+	return au_flag_test(sb, AuMask_COO);
+}
+
+/* ---------------------------------------------------------------------- */
+
+/* lock superblock. mainly for entry point functions */
+/*
+ * si_read_lock, si_write_lock,
+ * si_read_unlock, si_write_unlock, si_downgrade_lock
+ */
+SimpleRwsemFuncs(si, struct super_block *sb, stosi(sb)->si_rwsem);
+
+/* to debug easier, do not make them inlined functions */
+#define SiMustReadLock(sb)	RwMustReadLock(&stosi(sb)->si_rwsem)
+#define SiMustWriteLock(sb)	RwMustWriteLock(&stosi(sb)->si_rwsem)
+#define SiMustAnyLock(sb)	RwMustAnyLock(&stosi(sb)->si_rwsem)
+
+#endif /* __KERNEL__ */
+#endif /* __AUFS_SUPER_H__ */
diff --git a/fs/aufs/sysaufs.c b/fs/aufs/sysaufs.c
new file mode 100755
index 0000000..d686862
--- /dev/null
+++ b/fs/aufs/sysaufs.c
@@ -0,0 +1,620 @@
+/*
+ * Copyright (C) 2007 Junjiro Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+/* $Id: sysaufs.c,v 1.6 2007/05/14 03:40:10 sfjro Exp $ */
+
+#include <linux/module.h>
+#include <linux/seq_file.h>
+#include <linux/sysfs.h>
+#include "aufs.h"
+
+/* ---------------------------------------------------------------------- */
+
+/* super_blocks list is not exported */
+static DEFINE_MUTEX(aufs_sbilist_mtx);
+static LIST_HEAD(aufs_sbilist);
+
+/* ---------------------------------------------------------------------- */
+
+typedef ssize_t (*rwfunc_t)(struct kobject *kobj, char *buf, loff_t offset,
+			    size_t sz, struct sysaufs_args *args);
+static ssize_t sysaufs_read(struct kobject *kobj, char *buf, loff_t offset,
+			    size_t sz, struct sysaufs_args *args);
+static ssize_t sysaufs_free_write(struct kobject *kobj, char *buf, loff_t
+			    offset, size_t sz, struct sysaufs_args *args);
+
+#define GFunc(name, _index, func) \
+static ssize_t name(struct kobject *kobj, char *buf, loff_t offset, size_t sz) \
+{ \
+	struct sysaufs_args args = { \
+		.index	= (_index), \
+		.mtx	= &aufs_sbilist_mtx, \
+		.sb	= NULL \
+	}; \
+	return func(kobj, buf, offset, sz, &args); \
+}
+
+#define GFuncs(name, _index) \
+	GFunc(read_##name, _index, sysaufs_read); \
+	GFunc(write_##name, _index, sysaufs_free_write);
+
+static struct super_block *find_sb_locked(struct kobject *kobj)
+{
+	struct super_block *sb;
+	struct aufs_sbinfo *sbinfo;
+
+	TraceEnter();
+	MtxMustLock(&aufs_sbilist_mtx);
+
+	sb = NULL;
+	list_for_each_entry(sbinfo, &aufs_sbilist, si_list) {
+		if (&au_subsys_to_kset(sbinfo->si_sysaufs.subsys).kobj != kobj)
+			continue;
+		sb = sbinfo->si_mnt->mnt_sb;
+		si_read_lock(sb);
+		break;
+	}
+	return sb;
+}
+
+static ssize_t sb_func(struct kobject *kobj, char *buf, loff_t offset,
+		       size_t sz, struct sysaufs_args *args, rwfunc_t func)
+{
+	ssize_t err;
+
+	err = -ENOENT;
+	mutex_lock(&aufs_sbilist_mtx);
+	args->sb = find_sb_locked(kobj);
+	if (args->sb) {
+		err = func(kobj, buf, offset, sz, args);
+		si_read_unlock(args->sb);
+	}
+	mutex_unlock(&aufs_sbilist_mtx);
+	return err;
+}
+
+#define SbFunc(name, _index, func) \
+static ssize_t name(struct kobject *kobj, char *buf, loff_t offset, size_t sz) \
+{ \
+	struct sysaufs_args args = { \
+		.index	= (_index), \
+		.mtx	= NULL \
+	}; \
+	return sb_func(kobj, buf, offset, sz, &args, func); \
+}
+
+#define SbFuncs(name, index) \
+	SbFunc(read_##name, index, sysaufs_read); \
+	SbFunc(write_##name, index, sysaufs_free_write)
+
+static decl_subsys(aufs, NULL, NULL);
+enum {Brs, Stat, Config, _Last};
+static struct sysaufs_entry g_array[_Last];
+GFuncs(brs, Brs);
+GFuncs(stat, Stat);
+GFuncs(config, Config);
+
+SbFuncs(xino, SysaufsSb_XINO);
+
+#define SetEntry(e, _name, init_size, _ops) \
+	do { \
+		(e)->attr.attr.name = #_name; \
+		(e)->attr.attr.owner = THIS_MODULE; \
+		(e)->attr.attr.mode = S_IRUGO | S_IWUSR; \
+		(e)->attr.read = read_##_name; \
+		(e)->attr.write = write_##_name; \
+		(e)->allocated = init_size; \
+		(e)->err = -1; \
+		(e)->ops = _ops; \
+	} while (0)
+
+#define Priv(e)		(e)->attr.private
+#define Allocated(e)	(e)->allocated
+#define Len(e)		(e)->attr.size
+#define Name(e)		attr_name((e)->attr)
+
+/* ---------------------------------------------------------------------- */
+
+static void free_entry(struct sysaufs_entry *e)
+{
+	MtxMustLock(&aufs_sbilist_mtx);
+	DEBUG_ON(!Priv(e));
+
+	if (Allocated(e) > 0)
+		kfree(Priv(e));
+	else
+		free_pages((unsigned long)Priv(e), -Allocated(e));
+	Priv(e) = NULL;
+	Len(e) = 0;
+}
+
+static void free_entries(void)
+{
+	static int a[] = {Brs, -1};
+	int *p = a;
+
+	MtxMustLock(&aufs_sbilist_mtx);
+
+	while (*p >= 0) {
+		if (Priv(g_array + *p))
+			free_entry(g_array + *p);
+		p++;
+	}
+}
+
+static int alloc_entry(struct sysaufs_entry *e)
+{
+	MtxMustLock(&aufs_sbilist_mtx);
+	DEBUG_ON(Priv(e));
+	//Dbg("%d\n", Allocated(e));
+
+	if (Allocated(e) > 0)
+		Priv(e) = kmalloc(Allocated(e), GFP_KERNEL);
+	else
+		Priv(e) = (void*)__get_free_pages(GFP_KERNEL, -Allocated(e));
+	if (Priv(e))
+		return 0;
+	return -ENOMEM;
+}
+
+/* ---------------------------------------------------------------------- */
+
+static void unreg(au_subsys_t *subsys, struct sysaufs_entry *a, int n,
+		  au_subsys_t *parent)
+{
+	int i;
+
+	TraceEnter();
+
+	for (i = 0; i < n; i++, a++)
+		if (!a->err) {
+			sysfs_remove_bin_file
+				(&au_subsys_to_kset(*subsys).kobj, &a->attr);
+			if (Priv(a))
+				free_entry(a);
+		}
+
+	subsystem_unregister(subsys);
+	subsys_put(parent);
+}
+
+static int reg(au_subsys_t *subsys, struct sysaufs_entry *a, int n,
+	       au_subsys_t *parent)
+{
+	int err, i;
+
+	TraceEnter();
+
+	subsys_get(parent);
+	kobj_set_kset_s(&au_subsys_to_kset(*subsys), *parent);
+	err = subsystem_register(subsys);
+	if (unlikely(err))
+		goto out;
+
+	for (i = 0; !err && i < n; i++)
+		err = a[i].err = sysfs_create_bin_file
+			(&au_subsys_to_kset(*subsys).kobj, &a[i].attr);
+	if (unlikely(err))
+		unreg(subsys, a, n, parent);
+
+ out:
+	TraceErr(err);
+	return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+#define SbSetEntry(index, name, init_size) \
+	SetEntry(sa->array + index, name, init_size, au_si_ops);
+
+void sysaufs_add(struct aufs_sbinfo *sbinfo)
+{
+	int err;
+	struct sysaufs_sbinfo *sa = &sbinfo->si_sysaufs;
+
+	TraceEnter();
+
+	mutex_lock(&aufs_sbilist_mtx);
+	list_add_tail(&sbinfo->si_list, &aufs_sbilist);
+	free_entries();
+
+	memset(sa, 0, sizeof(*sa));
+	SbSetEntry(SysaufsSb_XINO, xino, 128);
+	err = kobject_set_name(&au_subsys_to_kset(sa->subsys).kobj, "%p",
+			       sbinfo->si_mnt->mnt_sb);
+	if (!err)
+		err = reg(&sa->subsys, sa->array, ARRAY_SIZE(sa->array),
+			  &aufs_subsys);
+	if (unlikely(err))
+		Warn("failed adding sysfs (%d)\n", err);
+
+	mutex_unlock(&aufs_sbilist_mtx);
+}
+
+void sysaufs_del(struct aufs_sbinfo *sbinfo)
+{
+	struct sysaufs_sbinfo *sa = &sbinfo->si_sysaufs;
+
+	TraceEnter();
+
+	mutex_lock(&aufs_sbilist_mtx);
+	unreg(&sa->subsys, sa->array, ARRAY_SIZE(sa->array), &aufs_subsys);
+	list_del(&sbinfo->si_list);
+	free_entries();
+	mutex_unlock(&aufs_sbilist_mtx);
+}
+
+void sysaufs_notify_remount(void)
+{
+	mutex_lock(&aufs_sbilist_mtx);
+	free_entries();
+	mutex_unlock(&aufs_sbilist_mtx);
+}
+
+/* ---------------------------------------------------------------------- */
+
+static int make_brs(struct seq_file *seq, struct sysaufs_args *args,
+		    int *do_size)
+{
+	int err;
+	struct aufs_sbinfo *sbinfo;
+
+	TraceEnter();
+	MtxMustLock(&aufs_sbilist_mtx);
+	DEBUG_ON(args->index != Brs);
+
+	err = 0;
+	list_for_each_entry(sbinfo, &aufs_sbilist, si_list) {
+		struct super_block *sb;
+		struct dentry *root;
+		struct vfsmount *mnt;
+
+		sb = sbinfo->si_mnt->mnt_sb;
+		root = sb->s_root;
+		aufs_read_lock(root, !AUFS_I_RLOCK);
+		mnt = sbinfo->si_mnt;
+		err = seq_escape
+			(seq, mnt->mnt_devname ? mnt->mnt_devname : "none",
+			 au_esc_chars);
+		if (!err)
+			err = seq_putc(seq, ' ');
+		if (!err)
+			err = seq_path(seq, mnt, root, au_esc_chars);
+		if (err > 0)
+			err = seq_printf(seq, " %p br:", sb);
+		if (!err)
+			err = au_show_brs(seq, sb);
+		aufs_read_unlock(root, !AUFS_I_RLOCK);
+		if (!err)
+			err = seq_putc(seq, '\n');
+		else
+			break;
+	}
+
+	TraceErr(err);
+	return err;
+}
+
+static int make_config(struct seq_file *seq, struct sysaufs_args *args,
+		       int *do_size)
+{
+	int err;
+
+	TraceEnter();
+	DEBUG_ON(args->index != Config);
+
+#ifdef CONFIG_AUFS
+	err = seq_puts(seq, "CONFIG_AUFS=y\n");
+#else
+	err = seq_puts(seq, "CONFIG_AUFS=m\n");
+#endif
+
+#define puts(m, v) \
+	if (!err) err = seq_puts(seq, "CONFIG_AUFS_" #m "=" #v "\n")
+#define puts_bool(m)	puts(m, y)
+#define puts_mod(m)	puts(m, m)
+
+#ifdef CONFIG_AUFS_FAKE_DM
+	puts_bool(FAKE_DM);
+#endif
+#ifdef CONFIG_AUFS_BRANCH_MAX_127
+	puts_bool(BRANCH_MAX_127);
+#elif defined(CONFIG_AUFS_BRANCH_MAX_511)
+	puts_bool(BRANCH_MAX_511);
+#elif defined(CONFIG_AUFS_BRANCH_MAX_1023)
+	puts_bool(BRANCH_MAX_1023);
+#elif defined(CONFIG_AUFS_BRANCH_MAX_32767)
+	puts_bool(BRANCH_MAX_32767);
+#endif
+	puts_bool(SYSAUFS);
+#ifdef CONFIG_AUFS_HINOTIFY
+	puts_bool(HINOTIFY);
+#endif
+#ifdef CONFIG_AUFS_EXPORT
+	puts_bool(EXPORT);
+#endif
+#ifdef CONFIG_AUFS_ROBR
+	puts_bool(ROBR);
+#endif
+#ifdef CONFIG_AUFS_DLGT
+	puts_bool(DLGT);
+#endif
+#ifdef CONFIG_AUFS_LHASH_PATCH
+	puts_bool(LHASH_PATCH);
+#endif
+#ifdef CONFIG_AUFS_KSIZE_PATCH
+	puts_bool(KSIZE_PATCH);
+#endif
+#ifdef CONFIG_AUFS_DEBUG
+	puts_bool(DEBUG);
+#endif
+#ifdef CONFIG_AUFS_COMPAT
+	puts_bool(COMPAT);
+#endif
+
+#undef puts_bool
+#undef puts
+
+	TraceErr(err);
+	return err;
+}
+
+static int make_stat(struct seq_file *seq, struct sysaufs_args *args,
+		     int *do_size)
+{
+	int err, i;
+
+	TraceEnter();
+	DEBUG_ON(args->index != Stat);
+
+	*do_size = 0;
+	err = seq_puts(seq, "wkq max_busy:");
+	for (i = 0; !err && i < aufs_nwkq; i++)
+		err = seq_printf(seq, " %u", au_wkq[i].max_busy);
+	if (!err)
+		err = seq_printf(seq, ", %u(generic)\n",
+				 au_wkq[aufs_nwkq].max_busy);
+	TraceErr(err);
+	return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+static int make(struct sysaufs_entry *e, struct sysaufs_args *args,
+		int *do_size)
+
+{
+	int err;
+	struct seq_file *seq;
+
+	TraceEnter();
+	DEBUG_ON(Priv(e));
+	MtxMustLock(&aufs_sbilist_mtx);
+
+	err = -ENOMEM;
+	seq = kzalloc(sizeof(*seq), GFP_KERNEL);
+	if (unlikely(!seq))
+		goto out;
+
+	Len(e) = 0;
+	while (1) {
+		err = alloc_entry(e);
+		if (unlikely(err))
+			break;
+
+		//mutex_init(&seq.lock);
+		seq->buf = Priv(e);
+		seq->count = 0;
+		seq->size = Allocated(e);
+		if (unlikely(Allocated(e) <= 0))
+			seq->size = PAGE_SIZE << -Allocated(e);
+
+		err = e->ops[args->index](seq, args, do_size);
+		if (!err) {
+			Len(e) = seq->count;
+			break; /* success */
+		}
+
+		free_entry(e);
+		if (Allocated(e) > 0) {
+			Allocated(e) <<= 1;
+			if (unlikely(Allocated(e) >= (int)PAGE_SIZE))
+				Allocated(e) = 0;
+		} else
+			Allocated(e)--;
+		//Dbg("%d\n", Allocated(e));
+	}
+	kfree(seq);
+
+ out:
+	TraceErr(err);
+	return err;
+}
+
+/* why does sysfs pass my parent kobject? */
+static struct dentry *find_me(struct dentry *parent, struct sysaufs_entry *e)
+{
+#if 1
+	struct dentry *dentry;
+	const char *name = Name(e);
+	const unsigned int len = strlen(name);
+
+	//Dbg("%.*s\n", DLNPair(parent));
+	spin_lock(&dcache_lock);
+	list_for_each_entry(dentry, &parent->d_subdirs, D_CHILD) {
+		//Dbg("%.*s\n", DLNPair(dentry));
+		if (len == dentry->d_name.len
+		    && !strcmp(dentry->d_name.name, name)) {
+			spin_unlock(&dcache_lock);
+			return dentry;
+		}
+	}
+	spin_unlock(&dcache_lock);
+#endif
+	return NULL;
+}
+
+static ssize_t sysaufs_read(struct kobject *kobj, char *buf, loff_t offset,
+			    size_t sz, struct sysaufs_args *args)
+{
+	ssize_t err;
+	loff_t len;
+	struct dentry *d;
+	struct sysaufs_entry *e;
+	int do_size;
+
+	LKTRTrace("{%d, %p}, offset %Ld, sz %lu\n",
+		  args->index, args->sb, offset, (unsigned long)sz);
+
+	if (unlikely(!sz))
+		return 0;
+
+	err = 0;
+	d = NULL;
+	e = g_array + args->index;
+	if (args->sb)
+		e = stosi(args->sb)->si_sysaufs.array + args->index;
+
+	do_size = 1;
+	if (args->mtx)
+		mutex_lock(args->mtx);
+	if (unlikely(!Priv(e))) {
+		err = make(e, args, &do_size);
+		DEBUG_ON(Len(e) > INT_MAX);
+		if (do_size) {
+			d = find_me(kobj->dentry, e);
+			if (d)
+				i_size_write(d->d_inode, Len(e));
+		}
+	}
+
+	if (!err) {
+		err = len = Len(e) - offset;
+		LKTRTrace("%Ld\n", len);
+		if (len > 0) {
+			if (len > sz)
+				err = sz;
+			memcpy(buf, Priv(e) + offset, err);
+		}
+
+		if (!do_size)
+			free_entry(e);
+	}
+	if (args->mtx)
+		mutex_unlock(args->mtx);
+
+	TraceErr(err);
+	return err;
+}
+
+static ssize_t sysaufs_free_write(struct kobject *kobj, char *buf,
+				  loff_t offset, size_t sz,
+				  struct sysaufs_args *args)
+{
+	struct dentry *d;
+	int allocated, len;
+	struct sysaufs_entry *e;
+
+	LKTRTrace("{%d, %p}\n", args->index, args->sb);
+
+	e = g_array + args->index;
+	if (args->sb)
+		e = stosi(args->sb)->si_sysaufs.array + args->index;
+
+	if (args->mtx)
+		mutex_lock(args->mtx);
+	if (Priv(e)) {
+		allocated = Allocated(e);
+		if (unlikely(allocated <= 0))
+			allocated = PAGE_SIZE << -allocated;
+		allocated >>= 1;
+		len = Len(e);
+
+		free_entry(e);
+		if (unlikely(len <= allocated)) {
+			if (Allocated(e) >= 0)
+				Allocated(e) = allocated;
+			else
+				Allocated(e)++;
+		}
+
+		d = find_me(kobj->dentry, e);
+		if (d && i_size_read(d->d_inode))
+			i_size_write(d->d_inode, 0);
+	}
+	if (args->mtx)
+		mutex_unlock(args->mtx);
+
+	return sz;
+}
+
+static sysaufs_op g_ops[] = {
+	[Brs]		= make_brs,
+	[Stat]		= make_stat,
+	[Config]	= make_config
+};
+
+/* ---------------------------------------------------------------------- */
+
+#define GSetEntry(index, name, init_size) \
+	SetEntry(g_array + index, name, init_size, g_ops)
+
+int __init sysaufs_init(void)
+{
+	int err;
+
+	GSetEntry(Brs, brs, 128);
+	GSetEntry(Stat, stat, 32);
+	GSetEntry(Config, config, 256);
+	err = reg(&aufs_subsys, g_array, ARRAY_SIZE(g_array), &fs_subsys);
+	TraceErr(err);
+	return err;
+}
+
+void __exit sysaufs_fin(void)
+{
+	mutex_lock(&aufs_sbilist_mtx);
+	unreg(&aufs_subsys, g_array, ARRAY_SIZE(g_array), &fs_subsys);
+	mutex_unlock(&aufs_sbilist_mtx);
+}
+
+/* ---------------------------------------------------------------------- */
+
+#ifdef DbgDlgt
+int is_branch(struct super_block *h_sb)
+{
+	int found = 0;
+	struct aufs_sbinfo *sbinfo;
+
+	//Dbg("here\n");
+	mutex_lock(&aufs_sbilist_mtx);
+	list_for_each_entry(sbinfo, &aufs_sbilist, si_list) {
+		aufs_bindex_t bindex, bend;
+		struct super_block *sb;
+
+		sb = sbinfo->si_mnt->mnt_sb;
+		si_read_lock(sb);
+		bend = sbend(sb);
+		for (bindex = 0; !found && bindex <= bend; bindex++)
+			found = (h_sb == sbr_sb(sb, bindex));
+		si_read_unlock(sb);
+	}
+	mutex_unlock(&aufs_sbilist_mtx);
+	return found;
+}
+#endif
diff --git a/fs/aufs/sysaufs.h b/fs/aufs/sysaufs.h
new file mode 100755
index 0000000..cf0247f
--- /dev/null
+++ b/fs/aufs/sysaufs.h
@@ -0,0 +1,83 @@
+/*
+ * Copyright (C) 2007 Junjiro Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+/* $Id: sysaufs.h,v 1.3 2007/05/14 06:27:18 sfjro Exp $ */
+
+#ifndef __SYSAUFS_H__
+#define __SYSAUFS_H__
+
+#ifdef __KERNEL__
+
+#include <linux/seq_file.h>
+#include <linux/sysfs.h>
+#include <linux/version.h>
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,22)
+typedef struct kset au_subsys_t;
+#define au_subsys_to_kset(subsys) (subsys)
+#else
+typedef struct subsystem au_subsys_t;
+#define au_subsys_to_kset(subsys) ((subsys).kset)
+#endif
+
+/* ---------------------------------------------------------------------- */
+
+/* arguments for an entry under sysfs */
+struct sysaufs_args {
+	int index;
+	struct mutex *mtx;
+	struct super_block *sb;
+};
+
+typedef int (*sysaufs_op)(struct seq_file *seq, struct sysaufs_args *args,
+			  int *do_size);
+
+/* an entry under sysfs */
+struct sysaufs_entry {
+	struct bin_attribute attr;
+	int allocated;	/* zero minus means pages */
+	int err;
+	sysaufs_op *ops;
+};
+
+/* ---------------------------------------------------------------------- */
+
+struct aufs_sbinfo;
+#ifdef CONFIG_AUFS_SYSAUFS
+void sysaufs_add(struct aufs_sbinfo *sbinfo);
+void sysaufs_del(struct aufs_sbinfo *sbinfo);
+int __init sysaufs_init(void);
+void sysaufs_fin(void);
+void sysaufs_notify_remount(void);
+#else
+static inline void sysaufs_add(struct aufs_sbinfo *sbinfo)
+{
+	/* nothing */
+}
+
+static inline void sysaufs_del(struct aufs_sbinfo *sbinfo)
+{
+	/* nothing */
+}
+#define sysaufs_init()			0
+#define sysaufs_fin()			/* */
+#define sysaufs_notify_remount()	/* */
+#endif /* CONFIG_AUFS_SYSAUFS */
+
+#endif /* __KERNEL__ */
+#endif /* __SYSAUFS_H__ */
diff --git a/fs/aufs/vdir.c b/fs/aufs/vdir.c
new file mode 100755
index 0000000..8e99b7d
--- /dev/null
+++ b/fs/aufs/vdir.c
@@ -0,0 +1,802 @@
+/*
+ * Copyright (C) 2005, 2006, 2007 Junjiro Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+/* $Id: vdir.c,v 1.22 2007/05/14 03:38:52 sfjro Exp $ */
+
+#include "aufs.h"
+
+static int calc_size(int namelen)
+{
+	int sz;
+
+	sz = sizeof(struct aufs_de) + namelen;
+	if (sizeof(ino_t) == sizeof(long)) {
+		const int mask = sizeof(ino_t) - 1;
+		if (sz & mask) {
+			sz += sizeof(ino_t);
+			sz &= ~mask;
+		}
+	} else {
+#if 0 // remove
+		BUG();
+		// this block will be discarded by optimizer.
+		int m;
+		m = sz % sizeof(ino_t);
+		if (m)
+			sz += sizeof(ino_t) - m;
+#endif
+	}
+
+	DEBUG_ON(sz % sizeof(ino_t));
+	return sz;
+}
+
+static int set_deblk_end(union aufs_deblk_p *p, union aufs_deblk_p *deblk_end)
+{
+	if (calc_size(0) <= deblk_end->p - p->p) {
+		p->de->de_str.len = 0;
+		//smp_mb();
+		return 0;
+	}
+	return -1; // error
+}
+
+/* returns true or false */
+static int is_deblk_end(union aufs_deblk_p *p, union aufs_deblk_p *deblk_end)
+{
+	if (calc_size(0) <= deblk_end->p - p->p)
+		return !p->de->de_str.len;
+	return 1;
+}
+
+static aufs_deblk_t *last_deblk(struct aufs_vdir *vdir)
+{
+	return vdir->vd_deblk[vdir->vd_nblk - 1];
+}
+
+void nhash_init(struct aufs_nhash *nhash)
+{
+	int i;
+	for (i = 0; i < AUFS_NHASH_SIZE; i++)
+		INIT_HLIST_HEAD(nhash->heads + i);
+}
+
+struct aufs_nhash *nhash_new(gfp_t gfp)
+{
+	struct aufs_nhash *nhash;
+
+	nhash = kmalloc(sizeof(*nhash), gfp);
+	if (nhash) {
+		nhash_init(nhash);
+		return nhash;
+	}
+	return ERR_PTR(-ENOMEM);
+}
+
+void nhash_del(struct aufs_nhash *nhash)
+{
+	nhash_fin(nhash);
+	kfree(nhash);
+}
+
+void nhash_move(struct aufs_nhash *dst, struct aufs_nhash *src)
+{
+	int i;
+
+	TraceEnter();
+
+	//DbgWhlist(src);
+	*dst = *src;
+	for (i = 0; i < AUFS_NHASH_SIZE; i++) {
+		struct hlist_head *h;
+		h = dst->heads + i;
+		if (h->first)
+			h->first->pprev = &h->first;
+		INIT_HLIST_HEAD(src->heads + i);
+	}
+	//DbgWhlist(src);
+	//DbgWhlist(dst);
+	//smp_mb();
+}
+
+/* ---------------------------------------------------------------------- */
+
+void nhash_fin(struct aufs_nhash *whlist)
+{
+	int i;
+	struct hlist_head *head;
+	struct aufs_wh *tpos;
+	struct hlist_node *pos, *n;
+
+	TraceEnter();
+
+	for (i = 0; i < AUFS_NHASH_SIZE; i++) {
+		head = whlist->heads + i;
+		hlist_for_each_entry_safe(tpos, pos, n, head, wh_hash) {
+			//hlist_del(pos);
+			kfree(tpos);
+		}
+	}
+}
+
+int is_longer_wh(struct aufs_nhash *whlist, aufs_bindex_t btgt, int limit)
+{
+	int n, i;
+	struct hlist_head *head;
+	struct aufs_wh *tpos;
+	struct hlist_node *pos;
+
+	LKTRTrace("limit %d\n", limit);
+	//return 1;
+
+	n = 0;
+	for (i = 0; i < AUFS_NHASH_SIZE; i++) {
+		head = whlist->heads + i;
+		hlist_for_each_entry(tpos, pos, head, wh_hash)
+			if (tpos->wh_bindex == btgt && ++n > limit)
+				return 1;
+	}
+	return 0;
+}
+
+/* returns found(true) or not */
+int test_known_wh(struct aufs_nhash *whlist, char *name, int namelen)
+{
+	struct hlist_head *head;
+	struct aufs_wh *tpos;
+	struct hlist_node *pos;
+	struct aufs_destr *str;
+
+	LKTRTrace("%.*s\n", namelen, name);
+
+	head = whlist->heads + au_name_hash(name, namelen);
+	hlist_for_each_entry(tpos, pos, head, wh_hash) {
+		str = &tpos->wh_str;
+		LKTRTrace("%.*s\n", str->len, str->name);
+		if (str->len == namelen && !memcmp(str->name, name, namelen))
+			return 1;
+	}
+	return 0;
+}
+
+int append_wh(struct aufs_nhash *whlist, char *name, int namelen,
+	      aufs_bindex_t bindex)
+{
+	int err;
+	struct aufs_destr *str;
+	struct aufs_wh *wh;
+
+	LKTRTrace("%.*s\n", namelen, name);
+
+	err = -ENOMEM;
+	wh = kmalloc(sizeof(*wh) + namelen, GFP_KERNEL);
+	if (unlikely(!wh))
+		goto out;
+	err = 0;
+	wh->wh_bindex = bindex;
+	str = &wh->wh_str;
+	str->len = namelen;
+	memcpy(str->name, name, namelen);
+	hlist_add_head(&wh->wh_hash,
+		       whlist->heads + au_name_hash(name, namelen));
+	//smp_mb();
+
+ out:
+	TraceErr(err);
+	return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+void free_vdir(struct aufs_vdir *vdir)
+{
+	aufs_deblk_t **deblk;
+
+	TraceEnter();
+
+	deblk = vdir->vd_deblk;
+	while (vdir->vd_nblk--) {
+		kfree(*deblk);
+		deblk++;
+	}
+	kfree(vdir->vd_deblk);
+	cache_free_vdir(vdir);
+}
+
+static int append_deblk(struct aufs_vdir *vdir)
+{
+	int err, sz, i;
+	aufs_deblk_t **o;
+	union aufs_deblk_p p, deblk_end;
+
+	TraceEnter();
+
+	err = -ENOMEM;
+	sz = sizeof(*o) * vdir->vd_nblk;
+	o = au_kzrealloc(vdir->vd_deblk, sz, sz + sizeof(*o), GFP_KERNEL);
+	if (unlikely(!o))
+		goto out;
+	vdir->vd_deblk = o;
+	p.deblk = kmalloc(sizeof(*p.deblk), GFP_KERNEL);
+	if (p.deblk) {
+		i = vdir->vd_nblk++;
+		vdir->vd_deblk[i] = p.deblk;
+		vdir->vd_last.i = i;
+		vdir->vd_last.p.p = p.p;
+		deblk_end.deblk = p.deblk + 1;
+		err = set_deblk_end(&p, &deblk_end);
+		DEBUG_ON(err);
+	}
+
+ out:
+	TraceErr(err);
+	return err;
+}
+
+static struct aufs_vdir *alloc_vdir(void)
+{
+	struct aufs_vdir *vdir;
+	int err;
+
+	TraceEnter();
+
+	err = -ENOMEM;
+	vdir = cache_alloc_vdir();
+	if (unlikely(!vdir))
+		goto out;
+	vdir->vd_deblk = kzalloc(sizeof(*vdir->vd_deblk), GFP_KERNEL);
+	if (unlikely(!vdir->vd_deblk))
+		goto out_free;
+
+	vdir->vd_nblk = 0;
+	vdir->vd_version = 0;
+	vdir->vd_jiffy = 0;
+	err = append_deblk(vdir);
+	if (!err)
+		return vdir; /* success */
+
+	kfree(vdir->vd_deblk);
+
+ out_free:
+	cache_free_vdir(vdir);
+ out:
+	vdir = ERR_PTR(err);
+	TraceErrPtr(vdir);
+	return vdir;
+}
+
+static int reinit_vdir(struct aufs_vdir *vdir)
+{
+	int err;
+	union aufs_deblk_p p, deblk_end;
+
+	TraceEnter();
+
+	while (vdir->vd_nblk > 1) {
+		kfree(vdir->vd_deblk[vdir->vd_nblk - 1]);
+		vdir->vd_deblk[vdir->vd_nblk - 1] = NULL;
+		vdir->vd_nblk--;
+	}
+	p.deblk = vdir->vd_deblk[0];
+	deblk_end.deblk = p.deblk + 1;
+	err = set_deblk_end(&p, &deblk_end);
+	DEBUG_ON(err);
+	vdir->vd_version = 0;
+	vdir->vd_jiffy = 0;
+	vdir->vd_last.i = 0;
+	vdir->vd_last.p.deblk = vdir->vd_deblk[0];
+	//smp_mb();
+	//DbgVdir(vdir);
+	return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+static void free_dehlist(struct aufs_nhash *dehlist)
+{
+	int i;
+	struct hlist_head *head;
+	struct aufs_dehstr *tpos;
+	struct hlist_node *pos, *n;
+
+	TraceEnter();
+
+	for (i = 0; i < AUFS_NHASH_SIZE; i++) {
+		head = dehlist->heads + i;
+		hlist_for_each_entry_safe(tpos, pos, n, head, hash) {
+			//hlist_del(pos);
+			cache_free_dehstr(tpos);
+		}
+	}
+}
+
+/* returns found(true) or not */
+static int test_known(struct aufs_nhash *delist, char *name, int namelen)
+{
+	struct hlist_head *head;
+	struct aufs_dehstr *tpos;
+	struct hlist_node *pos;
+	struct aufs_destr *str;
+
+	LKTRTrace("%.*s\n", namelen, name);
+
+	head = delist->heads + au_name_hash(name, namelen);
+	hlist_for_each_entry(tpos, pos, head, hash) {
+		str = tpos->str;
+		LKTRTrace("%.*s\n", str->len, str->name);
+		if (str->len == namelen && !memcmp(str->name, name, namelen))
+			return 1;
+	}
+	return 0;
+
+}
+
+static int append_de(struct aufs_vdir *vdir, char *name, int namelen, ino_t ino,
+		     unsigned int d_type, struct aufs_nhash *delist)
+{
+	int err, sz;
+	union aufs_deblk_p p, *room, deblk_end;
+	struct aufs_dehstr *dehstr;
+
+	LKTRTrace("%.*s %d, i%lu, dt%u\n", namelen, name, namelen, ino, d_type);
+
+	p.deblk = last_deblk(vdir);
+	deblk_end.deblk = p.deblk + 1;
+	room = &vdir->vd_last.p;
+	DEBUG_ON(room->p < p.p || deblk_end.p <= room->p
+		 || !is_deblk_end(room, &deblk_end));
+
+	sz = calc_size(namelen);
+	if (unlikely(sz > deblk_end.p - room->p)) {
+		err = append_deblk(vdir);
+		if (unlikely(err))
+			goto out;
+		p.deblk = last_deblk(vdir);
+		deblk_end.deblk = p.deblk + 1;
+		//smp_mb();
+		DEBUG_ON(room->p != p.p);
+	}
+
+	err = -ENOMEM;
+	dehstr = cache_alloc_dehstr();
+	if (unlikely(!dehstr))
+		goto out;
+	dehstr->str = &room->de->de_str;
+	hlist_add_head(&dehstr->hash,
+		       delist->heads + au_name_hash(name, namelen));
+
+	room->de->de_ino = ino;
+	room->de->de_type = d_type;
+	room->de->de_str.len = namelen;
+	memcpy(room->de->de_str.name, name, namelen);
+
+	err = 0;
+	room->p += sz;
+	if (unlikely(set_deblk_end(room, &deblk_end)))
+		err = append_deblk(vdir);
+	//smp_mb();
+
+ out:
+	TraceErr(err);
+	return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+struct fillvdir_arg {
+	struct file		*file;
+	struct aufs_vdir 	*vdir;
+	struct aufs_nhash	*delist;
+	struct aufs_nhash	*whlist;
+	aufs_bindex_t		bindex;
+	int			err;
+	int			called;
+};
+
+static int fillvdir(void *__arg, const char *__name, int namelen, loff_t offset,
+		    filldir_ino_t h_ino, unsigned int d_type)
+{
+	struct fillvdir_arg *arg = __arg;
+	char *name = (void*)__name;
+	aufs_bindex_t bindex, bend;
+	struct xino xino;
+	struct super_block *sb;
+
+	LKTRTrace("%.*s, namelen %d, i%Lu, dt%u\n",
+		  namelen, name, namelen, (u64)h_ino, d_type);
+
+	sb = arg->file->f_dentry->d_sb;
+	bend = arg->bindex;
+	arg->err = 0;
+	arg->called++;
+	//smp_mb();
+	if (namelen <= AUFS_WH_PFX_LEN
+	    || memcmp(name, AUFS_WH_PFX, AUFS_WH_PFX_LEN)) {
+		for (bindex = 0; bindex < bend; bindex++)
+			if (test_known(arg->delist + bindex, name, namelen)
+			    || test_known_wh(arg->whlist + bindex, name,
+					     namelen))
+				goto out; /* already exists or whiteouted */
+
+		arg->err = xino_read(sb, bend, h_ino, &xino);
+		if (!arg->err && !xino.ino) {
+			//struct inode *h_inode;
+			xino.ino = xino_new_ino(sb);
+			if (unlikely(!xino.ino))
+				arg->err = -EIO;
+#if 0
+			//xino.h_gen = AuXino_INVALID_HGEN;
+			h_inode = ilookup(sbr_sb(sb, bend), h_ino);
+			if (h_inode) {
+				if (!is_bad_inode(h_inode)) {
+					xino.h_gen = h_inode->i_generation;
+					WARN_ON(xino.h_gen == AuXino_INVALID_HGEN);
+				}
+				iput(h_inode);
+			}
+#endif
+			arg->err = xino_write(sb, bend, h_ino, &xino);
+		}
+		if (!arg->err)
+			arg->err = append_de(arg->vdir, name, namelen, xino.ino,
+					     d_type, arg->delist + bend);
+	} else {
+		name += AUFS_WH_PFX_LEN;
+		namelen -= AUFS_WH_PFX_LEN;
+		for (bindex = 0; bindex < bend; bindex++)
+			if (test_known_wh(arg->whlist + bend, name, namelen))
+				goto out; /* already whiteouted */
+		arg->err = append_wh(arg->whlist + bend, name, namelen, bend);
+	}
+
+ out:
+	if (!arg->err)
+		arg->vdir->vd_jiffy = jiffies;
+	//smp_mb();
+	TraceErr(arg->err);
+	return arg->err;
+}
+
+static int read_vdir(struct file *file, int may_read)
+{
+	int err, do_read, dlgt;
+	struct dentry *dentry;
+	struct inode *inode;
+	struct aufs_vdir *vdir, *allocated;
+	unsigned long expire;
+	struct fillvdir_arg arg;
+	aufs_bindex_t bindex, bend, bstart;
+	struct super_block *sb;
+
+	dentry = file->f_dentry;
+	LKTRTrace("%.*s,  may %d\n", DLNPair(dentry), may_read);
+	FiMustWriteLock(file);
+	inode = dentry->d_inode;
+	IMustLock(inode);
+	IiMustWriteLock(inode);
+	DEBUG_ON(!S_ISDIR(inode->i_mode));
+
+	err = 0;
+	allocated = NULL;
+	do_read = 0;
+	sb = inode->i_sb;
+	expire = stosi(sb)->si_rdcache;
+	vdir = ivdir(inode);
+	if (!vdir) {
+		DEBUG_ON(fvdir_cache(file));
+		do_read = 1;
+		vdir = alloc_vdir();
+		err = PTR_ERR(vdir);
+		if (IS_ERR(vdir))
+			goto out;
+		err = 0;
+		allocated = vdir;
+	} else if (may_read
+		   && (inode->i_version != vdir->vd_version
+		       || time_after(jiffies, vdir->vd_jiffy + expire))) {
+		LKTRTrace("iver %lu, vdver %lu, exp %lu\n",
+			  inode->i_version, vdir->vd_version,
+			  vdir->vd_jiffy + expire);
+		do_read = 1;
+		err = reinit_vdir(vdir);
+		if (unlikely(err))
+			goto out;
+	}
+	//DbgVdir(vdir); goto out;
+
+	if (!do_read)
+		return 0; /* success */
+
+	err = -ENOMEM;
+	bend = fbend(file);
+	arg.delist = kmalloc(sizeof(*arg.delist) * (bend + 1), GFP_KERNEL);
+	if (unlikely(!arg.delist))
+		goto out_vdir;
+	arg.whlist = kmalloc(sizeof(*arg.whlist) * (bend + 1), GFP_KERNEL);
+	if (unlikely(!arg.whlist))
+		goto out_delist;
+	err = 0;
+	for (bindex = 0; bindex <= bend; bindex++) {
+		nhash_init(arg.delist + bindex);
+		nhash_init(arg.whlist + bindex);
+	}
+
+	dlgt = need_dlgt(sb);
+	arg.file = file;
+	arg.vdir = vdir;
+	bstart = fbstart(file);
+	for (bindex = bstart; !err && bindex <= bend; bindex++) {
+		struct file *hf;
+		struct inode *h_inode;
+
+		hf = au_h_fptr_i(file, bindex);
+		if (!hf)
+			continue;
+
+		h_inode = hf->f_dentry->d_inode;
+		//hf->f_pos = 0;
+		arg.bindex = bindex;
+		do {
+			arg.err = 0;
+			arg.called = 0;
+			//smp_mb();
+			err = vfsub_readdir(hf, fillvdir, &arg, dlgt);
+			if (err >= 0)
+				err = arg.err;
+		} while (!err && arg.called);
+	}
+
+	for (bindex = bstart; bindex <= bend; bindex++) {
+		free_dehlist(arg.delist + bindex);
+		nhash_fin(arg.whlist + bindex);
+	}
+	kfree(arg.whlist);
+
+ out_delist:
+	kfree(arg.delist);
+ out_vdir:
+	if (!err) {
+		//file->f_pos = 0;
+		vdir->vd_version = inode->i_version;
+		vdir->vd_last.i = 0;
+		vdir->vd_last.p.deblk = vdir->vd_deblk[0];
+		if (allocated)
+			set_ivdir(inode, allocated);
+	} else if (allocated)
+		free_vdir(allocated);
+	//DbgVdir(vdir); goto out;
+
+ out:
+	TraceErr(err);
+	return err;
+}
+
+static int copy_vdir(struct aufs_vdir *tgt, struct aufs_vdir *src)
+{
+	int err, i, rerr, n;
+
+	TraceEnter();
+	DEBUG_ON(tgt->vd_nblk != 1);
+	//DbgVdir(tgt);
+
+	err = -ENOMEM;
+	if (tgt->vd_nblk < src->vd_nblk) {
+		aufs_deblk_t **p;
+		p = au_kzrealloc(tgt->vd_deblk, sizeof(*p) * tgt->vd_nblk,
+				 sizeof(*p) * src->vd_nblk, GFP_KERNEL);
+		if (unlikely(!p))
+			goto out;
+		tgt->vd_deblk = p;
+	}
+
+	n = tgt->vd_nblk = src->vd_nblk;
+	memcpy(tgt->vd_deblk[0], src->vd_deblk[0], AUFS_DEBLK_SIZE);
+	//tgt->vd_last.i = 0;
+	//tgt->vd_last.p.deblk = tgt->vd_deblk[0];
+	tgt->vd_version = src->vd_version;
+	tgt->vd_jiffy = src->vd_jiffy;
+
+	for (i = 1; i < n; i++) {
+		tgt->vd_deblk[i] = kmalloc(AUFS_DEBLK_SIZE, GFP_KERNEL);
+		if (tgt->vd_deblk[i])
+			memcpy(tgt->vd_deblk[i], src->vd_deblk[i],
+			       AUFS_DEBLK_SIZE);
+		else
+			goto out;
+	}
+	//smp_mb();
+	//DbgVdir(tgt);
+	return 0; /* success */
+
+ out:
+	rerr = reinit_vdir(tgt);
+	BUG_ON(rerr);
+	TraceErr(err);
+	return err;
+}
+
+int au_init_vdir(struct file *file)
+{
+	int err;
+	struct dentry *dentry;
+	struct inode *inode;
+	struct aufs_vdir *vdir_cache, *allocated;
+
+	dentry = file->f_dentry;
+	LKTRTrace("%.*s, pos %Ld\n", DLNPair(dentry), file->f_pos);
+	FiMustWriteLock(file);
+	inode = dentry->d_inode;
+	IiMustWriteLock(inode);
+	DEBUG_ON(!S_ISDIR(inode->i_mode));
+
+	err = read_vdir(file, !file->f_pos);
+	if (unlikely(err))
+		goto out;
+	//DbgVdir(ivdir(inode)); goto out;
+
+	allocated = NULL;
+	vdir_cache = fvdir_cache(file);
+	if (!vdir_cache) {
+		vdir_cache = alloc_vdir();
+		err = PTR_ERR(vdir_cache);
+		if (IS_ERR(vdir_cache))
+			goto out;
+		allocated = vdir_cache;
+	} else if (!file->f_pos && vdir_cache->vd_version != file->f_version) {
+		err = reinit_vdir(vdir_cache);
+		if (unlikely(err))
+			goto out;
+	} else
+		return 0; /* success */
+	//err = 0; DbgVdir(vdir_cache); goto out;
+
+	err = copy_vdir(vdir_cache, ivdir(inode));
+	if (!err) {
+		file->f_version = inode->i_version;
+		if (allocated)
+			set_fvdir_cache(file, allocated);
+	} else if (allocated)
+		free_vdir(allocated);
+
+ out:
+	TraceErr(err);
+	return err;
+}
+
+static loff_t calc_offset(struct aufs_vdir *vdir)
+{
+	loff_t offset;
+	union aufs_deblk_p p;
+
+	p.deblk = vdir->vd_deblk[vdir->vd_last.i];
+	offset = vdir->vd_last.p.p - p.p;
+	offset += sizeof(*p.deblk) * vdir->vd_last.i;
+	return offset;
+}
+
+/* returns true or false */
+static int seek_vdir(struct file *file)
+{
+	int valid, i, n;
+	struct dentry *dentry;
+	struct aufs_vdir *vdir_cache;
+	loff_t offset;
+	union aufs_deblk_p p, deblk_end;
+
+	dentry = file->f_dentry;
+	LKTRTrace("%.*s, pos %Ld\n", DLNPair(dentry), file->f_pos);
+	vdir_cache = fvdir_cache(file);
+	DEBUG_ON(!vdir_cache);
+	//DbgVdir(vdir_cache);
+
+	valid = 1;
+	offset = calc_offset(vdir_cache);
+	LKTRTrace("offset %Ld\n", offset);
+	if (file->f_pos == offset)
+		goto out;
+
+	vdir_cache->vd_last.i = 0;
+	vdir_cache->vd_last.p.deblk = vdir_cache->vd_deblk[0];
+	if (!file->f_pos)
+		goto out;
+
+	valid = 0;
+	i = file->f_pos / AUFS_DEBLK_SIZE;
+	LKTRTrace("i %d\n", i);
+	if (i >= vdir_cache->vd_nblk)
+		goto out;
+
+	n = vdir_cache->vd_nblk;
+	//DbgVdir(vdir_cache);
+	for (; i < n; i++) {
+		p.deblk = vdir_cache->vd_deblk[i];
+		deblk_end.deblk = p.deblk + 1;
+		offset = i * AUFS_DEBLK_SIZE;
+		while (!is_deblk_end(&p, &deblk_end) && offset < file->f_pos) {
+			int l;
+			l = calc_size(p.de->de_str.len);
+			offset += l;
+			p.p += l;
+		}
+		if (!is_deblk_end(&p, &deblk_end)) {
+			valid = 1;
+			vdir_cache->vd_last.i = i;
+			vdir_cache->vd_last.p = p;
+			break;
+		}
+	}
+
+ out:
+	//smp_mb();
+	//DbgVdir(vdir_cache);
+	TraceErr(!valid);
+	return valid;
+}
+
+int au_fill_de(struct file *file, void *dirent, filldir_t filldir)
+{
+	int err, l;
+	struct dentry *dentry;
+	struct aufs_vdir *vdir_cache;
+	struct aufs_de *de;
+	union aufs_deblk_p deblk_end;
+
+	dentry = file->f_dentry;
+	LKTRTrace("%.*s, pos %Ld\n", DLNPair(dentry), file->f_pos);
+	vdir_cache = fvdir_cache(file);
+	DEBUG_ON(!vdir_cache);
+	//DbgVdir(vdir_cache);
+
+	if (!seek_vdir(file))
+		return 0;
+
+	while (1) {
+		deblk_end.deblk
+			= vdir_cache->vd_deblk[vdir_cache->vd_last.i] + 1;
+		while (!is_deblk_end(&vdir_cache->vd_last.p, &deblk_end)) {
+			de = vdir_cache->vd_last.p.de;
+			LKTRTrace("%.*s, off%Ld, i%lu, dt%d\n",
+				  de->de_str.len, de->de_str.name,
+				  file->f_pos, de->de_ino, de->de_type);
+			err = filldir(dirent, de->de_str.name, de->de_str.len,
+				      file->f_pos, de->de_ino, de->de_type);
+			if (unlikely(err)) {
+				TraceErr(err);
+				//return err;
+				//todo: ignore the error caused by udba.
+				return 0;
+			}
+
+			l = calc_size(de->de_str.len);
+			vdir_cache->vd_last.p.p += l;
+			file->f_pos += l;
+		}
+		if (vdir_cache->vd_last.i < vdir_cache->vd_nblk - 1) {
+			vdir_cache->vd_last.i++;
+			vdir_cache->vd_last.p.deblk
+				= vdir_cache->vd_deblk[vdir_cache->vd_last.i];
+			file->f_pos = sizeof(*vdir_cache->vd_last.p.deblk)
+				* vdir_cache->vd_last.i;
+			continue;
+		}
+		break;
+	}
+
+	//smp_mb();
+	return 0;
+}
diff --git a/fs/aufs/vfsub.c b/fs/aufs/vfsub.c
new file mode 100755
index 0000000..8571d21
--- /dev/null
+++ b/fs/aufs/vfsub.c
@@ -0,0 +1,665 @@
+/*
+ * Copyright (C) 2007 Junjiro Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+/* $Id: vfsub.c,v 1.5 2007/04/23 00:55:06 sfjro Exp $ */
+// I'm going to slightly mad
+
+#include "aufs.h"
+
+/* ---------------------------------------------------------------------- */
+
+#ifdef CONFIG_AUFS_DLGT
+struct permission_args {
+	int *errp;
+	struct inode *inode;
+	int mask;
+	struct nameidata *nd;
+};
+
+static void call_permission(void *args)
+{
+	struct permission_args *a = args;
+	*a->errp = do_vfsub_permission(a->inode, a->mask, a->nd);
+}
+
+int vfsub_permission(struct inode *inode, int mask, struct nameidata *nd,
+		     int dlgt)
+{
+	if (!dlgt)
+		return do_vfsub_permission(inode, mask, nd);
+	else {
+		int err;
+		struct permission_args args = {
+			.errp	= &err,
+			.inode	= inode,
+			.mask	= mask,
+			.nd	= nd
+		};
+		au_wkq_wait(call_permission, &args, /*dlgt*/1);
+		return err;
+	}
+}
+
+/* ---------------------------------------------------------------------- */
+
+struct create_args {
+	int *errp;
+	struct inode *dir;
+	struct dentry *dentry;
+	int mode;
+	struct nameidata *nd;
+};
+
+static void call_create(void *args)
+{
+	struct create_args *a = args;
+	*a->errp = do_vfsub_create(a->dir, a->dentry, a->mode, a->nd);
+}
+
+int vfsub_create(struct inode *dir, struct dentry *dentry, int mode,
+		 struct nameidata *nd, int dlgt)
+{
+	if (!dlgt)
+		return do_vfsub_create(dir, dentry, mode, nd);
+	else {
+		int err;
+		struct create_args args = {
+			.errp	= &err,
+			.dir	= dir,
+			.dentry	= dentry,
+			.mode	= mode,
+			.nd	= nd
+		};
+		au_wkq_wait(call_create, &args, /*dlgt*/1);
+		return err;
+	}
+}
+
+struct symlink_args {
+	int *errp;
+	struct inode *dir;
+	struct dentry *dentry;
+	const char *symname;
+	int mode;
+};
+
+static void call_symlink(void *args)
+{
+	struct symlink_args *a = args;
+	*a->errp = do_vfsub_symlink(a->dir, a->dentry, a->symname, a->mode);
+}
+
+int vfsub_symlink(struct inode *dir, struct dentry *dentry, const char *symname,
+		  int mode, int dlgt)
+{
+	if (!dlgt)
+		return do_vfsub_symlink(dir, dentry, symname, mode);
+	else {
+		int err;
+		struct symlink_args args = {
+			.errp		= &err,
+			.dir		= dir,
+			.dentry		= dentry,
+			.symname	= symname,
+			.mode		= mode
+		};
+		au_wkq_wait(call_symlink, &args, /*dlgt*/1);
+		return err;
+	}
+}
+
+struct mknod_args {
+	int *errp;
+	struct inode *dir;
+	struct dentry *dentry;
+	int mode;
+	dev_t dev;
+};
+
+static void call_mknod(void *args)
+{
+	struct mknod_args *a = args;
+	*a->errp = do_vfsub_mknod(a->dir, a->dentry, a->mode, a->dev);
+}
+
+int vfsub_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev,
+		int dlgt)
+{
+	if (!dlgt)
+		return do_vfsub_mknod(dir, dentry, mode, dev);
+	else {
+		int err;
+		struct mknod_args args = {
+			.errp	= &err,
+			.dir	= dir,
+			.dentry	= dentry,
+			.mode	= mode,
+			.dev	= dev
+		};
+		au_wkq_wait(call_mknod, &args, /*dlgt*/1);
+		return err;
+	}
+}
+
+struct mkdir_args {
+	int *errp;
+	struct inode *dir;
+	struct dentry *dentry;
+	int mode;
+};
+
+static void call_mkdir(void *args)
+{
+	struct mkdir_args *a = args;
+	*a->errp = do_vfsub_mkdir(a->dir, a->dentry, a->mode);
+}
+
+int vfsub_mkdir(struct inode *dir, struct dentry *dentry, int mode, int dlgt)
+{
+	if (!dlgt)
+		return do_vfsub_mkdir(dir, dentry, mode);
+	else {
+		int err;
+		struct mkdir_args args = {
+			.errp	= &err,
+			.dir	= dir,
+			.dentry	= dentry,
+			.mode	= mode
+		};
+		au_wkq_wait(call_mkdir, &args, /*dlgt*/1);
+		return err;
+	}
+}
+
+/* ---------------------------------------------------------------------- */
+
+struct link_args {
+	int *errp;
+	struct inode *dir;
+	struct dentry *src_dentry, *dentry;
+};
+
+static void call_link(void *args)
+{
+	struct link_args *a = args;
+	*a->errp = do_vfsub_link(a->src_dentry, a->dir, a->dentry);
+}
+
+int vfsub_link(struct dentry *src_dentry, struct inode *dir,
+	       struct dentry *dentry, int dlgt)
+{
+	if (!dlgt)
+		return do_vfsub_link(src_dentry, dir, dentry);
+	else {
+		int err;
+		struct link_args args = {
+			.errp		= &err,
+			.src_dentry	= src_dentry,
+			.dir		= dir,
+			.dentry		= dentry
+		};
+		au_wkq_wait(call_link, &args, /*dlgt*/1);
+		return err;
+	}
+}
+
+struct rename_args {
+	int *errp;
+	struct inode *src_dir, *dir;
+	struct dentry *src_dentry, *dentry;
+};
+
+static void call_rename(void *args)
+{
+	struct rename_args *a = args;
+	*a->errp = do_vfsub_rename(a->src_dir, a->src_dentry, a->dir,
+				   a->dentry);
+}
+
+int vfsub_rename(struct inode *src_dir, struct dentry *src_dentry,
+		 struct inode *dir, struct dentry *dentry, int dlgt)
+{
+	if (!dlgt)
+		return do_vfsub_rename(src_dir, src_dentry, dir, dentry);
+	else {
+		int err;
+		struct rename_args args = {
+			.errp		= &err,
+			.src_dir	= src_dir,
+			.src_dentry	= src_dentry,
+			.dir		= dir,
+			.dentry		= dentry
+		};
+		au_wkq_wait(call_rename, &args, /*dlgt*/1);
+		return err;
+	}
+}
+
+struct rmdir_args {
+	int *errp;
+	struct inode *dir;
+	struct dentry *dentry;
+};
+
+static void call_rmdir(void *args)
+{
+	struct rmdir_args *a = args;
+	*a->errp = do_vfsub_rmdir(a->dir, a->dentry);
+}
+
+int vfsub_rmdir(struct inode *dir, struct dentry *dentry, int dlgt)
+{
+	if (!dlgt)
+		return do_vfsub_rmdir(dir, dentry);
+	else {
+		int err;
+		struct rmdir_args args = {
+			.errp	= &err,
+			.dir	= dir,
+			.dentry	= dentry
+		};
+		au_wkq_wait(call_rmdir, &args, /*dlgt*/1);
+		return err;
+	}
+}
+
+/* ---------------------------------------------------------------------- */
+
+struct read_args {
+	ssize_t *errp;
+	struct file *file;
+	union {
+		void *kbuf;
+		char __user *ubuf;
+	};
+	size_t count;
+	loff_t *ppos;
+};
+
+static void call_read_k(void *args)
+{
+	struct read_args *a = args;
+	LKTRTrace("%.*s, cnt %lu, pos %Ld\n",
+		  DLNPair(a->file->f_dentry), (unsigned long)a->count,
+		  *a->ppos);
+	*a->errp = do_vfsub_read_k(a->file, a->kbuf, a->count, a->ppos);
+}
+
+ssize_t vfsub_read_u(struct file *file, char __user *ubuf, size_t count,
+		     loff_t *ppos, int dlgt)
+{
+	if (!dlgt)
+		return do_vfsub_read_u(file, ubuf, count, ppos);
+	else {
+		ssize_t err, read;
+		struct read_args args = {
+			.errp	= &err,
+			.file	= file,
+			.count	= count,
+			.ppos	= ppos
+		};
+
+		if (unlikely(!count))
+			return 0;
+
+		/*
+		 * workaround an application bug.
+		 * generally, read(2) or write(2) may return the value shorter
+		 * than requested. But many applications don't support it,
+		 * for example bash.
+		 */
+		err = -ENOMEM;
+		if (args.count > PAGE_SIZE)
+			args.count = PAGE_SIZE;
+		args.kbuf = kmalloc(args.count, GFP_KERNEL);
+		if (unlikely(!args.kbuf))
+			goto out;
+
+		read = 0;
+		do {
+			au_wkq_wait(call_read_k, &args, /*dlgt*/1);
+			if (unlikely(err > 0
+				     && copy_to_user(ubuf, args.kbuf, err))) {
+				err = -EFAULT;
+				goto out_free;
+			} else if (!err)
+				break;
+			else if (unlikely(err < 0))
+				goto out_free;
+			count -= err;
+			/* do not read too much because of file i/o pointer */
+			if (unlikely(count < args.count))
+				args.count = count;
+			ubuf += err;
+			read += err;
+		} while (count);
+		smp_mb();
+		err = read;
+
+	out_free:
+		kfree(args.kbuf);
+	out:
+		return err;
+	}
+}
+
+ssize_t vfsub_read_k(struct file *file, void *kbuf, size_t count, loff_t *ppos,
+		     int dlgt)
+{
+	if (!dlgt)
+		return do_vfsub_read_k(file, kbuf, count, ppos);
+	else {
+		ssize_t err;
+		struct read_args args = {
+			.errp	= &err,
+			.file	= file,
+			.count	= count,
+			.ppos	= ppos
+		};
+		args.kbuf = kbuf;
+		au_wkq_wait(call_read_k, &args, /*dlgt*/1);
+		return err;
+	}
+}
+
+struct write_args {
+	ssize_t *errp;
+	struct file *file;
+	union {
+		void *kbuf;
+		const char __user *ubuf;
+	};
+	void *buf;
+	size_t count;
+	loff_t *ppos;
+};
+
+static void call_write_k(void *args)
+{
+	struct write_args *a = args;
+	LKTRTrace("%.*s, cnt %lu, pos %Ld\n",
+		  DLNPair(a->file->f_dentry), (unsigned long)a->count,
+		  *a->ppos);
+	*a->errp = do_vfsub_write_k(a->file, a->kbuf, a->count, a->ppos);
+}
+
+ssize_t vfsub_write_u(struct file *file, const char __user *ubuf, size_t count,
+		      loff_t *ppos, int dlgt)
+{
+	if (!dlgt)
+		return do_vfsub_write_u(file, ubuf, count, ppos);
+	else {
+		ssize_t err, written;
+		struct write_args args = {
+			.errp	= &err,
+			.file	= file,
+			.count	= count,
+			.ppos	= ppos
+		};
+
+		if (unlikely(!count))
+			return 0;
+
+		/*
+		 * workaround an application bug.
+		 * generally, read(2) or write(2) may return the value shorter
+		 * than requested. But many applications don't support it,
+		 * for example bash.
+		 */
+		err = -ENOMEM;
+		if (args.count > PAGE_SIZE)
+			args.count = PAGE_SIZE;
+		args.kbuf = kmalloc(args.count, GFP_KERNEL);
+		if (unlikely(!args.kbuf))
+			goto out;
+
+		written = 0;
+		do {
+			if (unlikely(copy_from_user(args.kbuf, ubuf, args.count))) {
+				err = -EFAULT;
+				goto out_free;
+			}
+
+			au_wkq_wait(call_write_k, &args, /*dlgt*/1);
+			if (err > 0) {
+				count -= err;
+				if (count < args.count)
+					args.count = count;
+				ubuf += err;
+				written += err;
+			} else if (!err)
+				break;
+			else if (unlikely(err < 0))
+				goto out_free;
+		} while (count);
+		err = written;
+
+	out_free:
+		kfree(args.kbuf);
+	out:
+		return err;
+	}
+}
+
+ssize_t vfsub_write_k(struct file *file, void *kbuf, size_t count, loff_t *ppos,
+		      int dlgt)
+{
+	if (!dlgt)
+		return do_vfsub_write_k(file, kbuf, count, ppos);
+	else {
+		ssize_t err;
+		struct write_args args = {
+			.errp	= &err,
+			.file	= file,
+			.count	= count,
+			.ppos	= ppos
+		};
+		args.kbuf = kbuf;
+		au_wkq_wait(call_write_k, &args, /*dlgt*/1);
+		return err;
+	}
+}
+
+struct readdir_args {
+	int *errp;
+	struct file *file;
+	filldir_t filldir;
+	void *arg;
+};
+
+static void call_readdir(void *args)
+{
+	struct readdir_args *a = args;
+	*a->errp = do_vfsub_readdir(a->file, a->filldir, a->arg);
+}
+
+int vfsub_readdir(struct file *file, filldir_t filldir, void *arg, int dlgt)
+{
+	if (!dlgt)
+		return do_vfsub_readdir(file, filldir, arg);
+	else {
+		int err;
+		struct readdir_args args = {
+			.errp		= &err,
+			.file		= file,
+			.filldir	= filldir,
+			.arg		= arg
+		};
+		au_wkq_wait(call_readdir, &args, /*dlgt*/1);
+		return err;
+	}
+}
+#endif /* CONFIG_AUFS_DLGT */
+
+/* ---------------------------------------------------------------------- */
+
+struct notify_change_args {
+	int *errp;
+	struct dentry *h_dentry;
+	struct iattr *ia;
+};
+
+static void call_notify_change(void *args)
+{
+	struct notify_change_args *a = args;
+	struct inode *h_inode;
+
+	LKTRTrace("%.*s, ia_valid 0x%x\n",
+		  DLNPair(a->h_dentry), a->ia->ia_valid);
+	h_inode = a->h_dentry->d_inode;
+	IMustLock(h_inode);
+
+	*a->errp = -EPERM;
+	if (!IS_IMMUTABLE(h_inode) && !IS_APPEND(h_inode)) {
+		lockdep_off();
+		*a->errp = notify_change(a->h_dentry, a->ia);
+		lockdep_on();
+	}
+	TraceErr(*a->errp);
+}
+
+int vfsub_notify_change(struct dentry *dentry, struct iattr *ia, int dlgt)
+{
+	int err;
+	struct notify_change_args args = {
+		.errp		= &err,
+		.h_dentry	= dentry,
+		.ia		= ia
+	};
+
+#ifndef CONFIG_AUFS_DLGT
+	call_notify_change(&args);
+#else
+	if (!dlgt)
+		call_notify_change(&args);
+	else
+		au_wkq_wait(call_notify_change, &args, /*dlgt*/1);
+#endif
+
+	TraceErr(err);
+	return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+struct unlink_args {
+	int *errp;
+	struct inode *dir;
+	struct dentry *dentry;
+};
+
+static void call_unlink(void *args)
+{
+	struct unlink_args *a = args;
+	struct inode *h_inode;
+	const int stop_sillyrename = (au_is_nfs(a->dentry->d_sb)
+				      && atomic_read(&a->dentry->d_count) == 1);
+
+	LKTRTrace("%.*s, stop_silly %d, cnt %d\n",
+		  DLNPair(a->dentry), stop_sillyrename,
+		  atomic_read(&a->dentry->d_count));
+	IMustLock(a->dir);
+
+	if (!stop_sillyrename)
+		dget(a->dentry);
+	h_inode = a->dentry->d_inode;
+	if (h_inode)
+		atomic_inc(&h_inode->i_count);
+#if 0 // partial testing
+	{
+		struct qstr *name = &a->dentry->d_name;
+		if (name->len == sizeof(AUFS_XINO_FNAME) - 1
+		    && !strncmp(name->name, AUFS_XINO_FNAME, name->len)) {
+			lockdep_off();
+			*a->errp = vfs_unlink(a->dir, a->dentry);
+			lockdep_on();
+		} else
+			err = -1;
+	}
+#else
+	// vfs_unlink() locks inode
+	lockdep_off();
+	*a->errp = vfs_unlink(a->dir, a->dentry);
+	lockdep_on();
+#endif
+
+	if (!stop_sillyrename)
+		dput(a->dentry);
+	if (h_inode)
+		iput(h_inode);
+
+	TraceErr(*a->errp);
+}
+
+/*
+ * @dir: must be locked.
+ * @dentry: target dentry.
+ */
+int vfsub_unlink(struct inode *dir, struct dentry *dentry, int dlgt)
+{
+	int err;
+	struct unlink_args args = {
+		.errp	= &err,
+		.dir	= dir,
+		.dentry	= dentry
+	};
+
+#ifndef CONFIG_AUFS_DLGT
+	call_unlink(&args);
+#else
+	if (!dlgt)
+		call_unlink(&args);
+	else
+		au_wkq_wait(call_unlink, &args, /*dlgt*/1);
+#endif
+	return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+struct statfs_args {
+	int *errp;
+	void *arg;
+	struct kstatfs *buf;
+};
+
+static void call_statfs(void *args)
+{
+	struct statfs_args *a = args;
+	*a->errp = vfs_statfs(a->arg, a->buf);
+}
+
+int vfsub_statfs(void *arg, struct kstatfs *buf, int dlgt)
+{
+	int err;
+	struct statfs_args args = {
+		.errp	= &err,
+		.arg	= arg,
+		.buf	= buf
+	};
+
+#ifndef CONFIG_AUFS_DLGT
+	call_statfs(&args);
+#else
+	if (!dlgt)
+		call_statfs(&args);
+	else
+		au_wkq_wait(call_statfs, &args, /*dlgt*/1);
+#endif
+	return err;
+}
diff --git a/fs/aufs/vfsub.h b/fs/aufs/vfsub.h
new file mode 100755
index 0000000..52f15cc
--- /dev/null
+++ b/fs/aufs/vfsub.h
@@ -0,0 +1,427 @@
+/*
+ * Copyright (C) 2007 Junjiro Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+/* $Id: vfsub.h,v 1.8 2007/05/14 03:39:10 sfjro Exp $ */
+
+#ifndef __AUFS_VFSUB_H__
+#define __AUFS_VFSUB_H__
+
+#ifdef __KERNEL__
+
+#include <linux/fs.h>
+#include <asm/uaccess.h>
+#include "wkq.h"
+
+/* ---------------------------------------------------------------------- */
+
+/* simple abstractions, for future use */
+static inline
+int do_vfsub_permission(struct inode *inode, int mask, struct nameidata *nd)
+{
+	LKTRTrace("i%lu, mask 0x%x, nd %p\n", inode->i_ino, mask, nd);
+#if 0
+#else
+	return permission(inode, mask, nd);
+#endif
+}
+
+static inline
+struct file *vfsub_filp_open(const char *path, int oflags, int mode)
+{
+	struct file *err;
+
+	LKTRTrace("%s\n", path);
+
+	lockdep_off();
+	err = filp_open(path, oflags, mode);
+	lockdep_on();
+	return err;
+}
+
+static inline
+int vfsub_path_lookup(const char *name, unsigned int flags,
+		      struct nameidata *nd)
+{
+	int err;
+
+	LKTRTrace("%s\n", name);
+
+	//lockdep_off();
+	err = path_lookup(name, flags, nd);
+	//lockdep_on();
+	return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+static inline
+int do_vfsub_create(struct inode *dir, struct dentry *dentry, int mode,
+		    struct nameidata *nd)
+{
+	LKTRTrace("i%lu, %.*s, 0x%x\n", dir->i_ino, DLNPair(dentry), mode);
+#if 0
+#else
+	return vfs_create(dir, dentry, mode, nd);
+#endif
+}
+
+static inline
+int do_vfsub_symlink(struct inode *dir, struct dentry *dentry,
+		     const char *symname, int mode)
+{
+	LKTRTrace("i%lu, %.*s, %s, 0x%x\n",
+		  dir->i_ino, DLNPair(dentry), symname, mode);
+#if 0
+#else
+	return vfs_symlink(dir, dentry, symname, mode);
+#endif
+}
+
+static inline
+int do_vfsub_mknod(struct inode *dir, struct dentry *dentry, int mode,
+		   dev_t dev)
+{
+	LKTRTrace("i%lu, %.*s, 0x%x\n", dir->i_ino, DLNPair(dentry), mode);
+#if 0
+#else
+	return vfs_mknod(dir, dentry, mode, dev);
+#endif
+}
+
+static inline
+int do_vfsub_link(struct dentry *src_dentry, struct inode *dir,
+		  struct dentry *dentry)
+{
+	int err;
+
+	LKTRTrace("%.*s, i%lu, %.*s\n",
+		  DLNPair(src_dentry), dir->i_ino, DLNPair(dentry));
+
+	lockdep_off();
+#if 0
+#else
+	err = vfs_link(src_dentry, dir, dentry);
+#endif
+	lockdep_on();
+	return err;
+}
+
+static inline
+int do_vfsub_rename(struct inode *src_dir, struct dentry *src_dentry,
+		    struct inode *dir, struct dentry *dentry)
+{
+	int err;
+
+	LKTRTrace("i%lu, %.*s, i%lu, %.*s\n",
+		  src_dir->i_ino, DLNPair(src_dentry),
+		  dir->i_ino, DLNPair(dentry));
+
+	lockdep_off();
+#if 0
+#else
+	err = vfs_rename(src_dir, src_dentry, dir, dentry);
+#endif
+	lockdep_on();
+	return err;
+}
+
+static inline
+int do_vfsub_mkdir(struct inode *dir, struct dentry *dentry, int mode)
+{
+	LKTRTrace("i%lu, %.*s, 0x%x\n", dir->i_ino, DLNPair(dentry), mode);
+#if 0
+#else
+	return vfs_mkdir(dir, dentry, mode);
+#endif
+}
+
+static inline int do_vfsub_rmdir(struct inode *dir, struct dentry *dentry)
+{
+	int err;
+
+	LKTRTrace("i%lu, %.*s\n", dir->i_ino, DLNPair(dentry));
+
+	lockdep_off();
+#if 0
+#else
+	err = vfs_rmdir(dir, dentry);
+#endif
+	lockdep_on();
+	return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+static inline
+ssize_t do_vfsub_read_u(struct file *file, char __user *ubuf, size_t count,
+			loff_t *ppos)
+{
+	ssize_t err;
+
+	LKTRTrace("%.*s, cnt %lu, pos %Ld\n",
+		  DLNPair(file->f_dentry), (unsigned long)count, *ppos);
+
+	/* nfs uses some locks */
+	lockdep_off();
+#if 0
+#else
+	err = vfs_read(file, ubuf, count, ppos);
+#endif
+	lockdep_on();
+	return err;
+}
+
+// kernel_read() ??
+static inline
+ssize_t do_vfsub_read_k(struct file *file, void *kbuf, size_t count,
+			loff_t *ppos)
+{
+	ssize_t err;
+	mm_segment_t oldfs;
+
+	oldfs = get_fs();
+	set_fs(KERNEL_DS);
+	err = do_vfsub_read_u(file, (char __user*)kbuf, count, ppos);
+	set_fs(oldfs);
+	return err;
+}
+
+static inline
+ssize_t do_vfsub_write_u(struct file *file, const char __user *ubuf,
+			 size_t count, loff_t *ppos)
+{
+	ssize_t err;
+
+	LKTRTrace("%.*s, cnt %lu, pos %Ld\n",
+		  DLNPair(file->f_dentry), (unsigned long)count, *ppos);
+
+	lockdep_off();
+#if 0
+#else
+	err = vfs_write(file, ubuf, count, ppos);
+#endif
+	lockdep_on();
+	return err;
+}
+
+static inline
+ssize_t do_vfsub_write_k(struct file *file, void *kbuf, size_t count,
+			 loff_t *ppos)
+{
+	ssize_t err;
+	mm_segment_t oldfs;
+
+	oldfs = get_fs();
+	set_fs(KERNEL_DS);
+	err = do_vfsub_write_u(file, (const char __user*)kbuf, count, ppos);
+	set_fs(oldfs);
+	return err;
+}
+
+static inline
+int do_vfsub_readdir(struct file *file, filldir_t filldir, void *arg)
+{
+	int err;
+
+	LKTRTrace("%.*s\n", DLNPair(file->f_dentry));
+
+	lockdep_off();
+#if 0
+#else
+	err = vfs_readdir(file, filldir, arg);
+#endif
+	lockdep_on();
+	return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+static inline loff_t vfsub_llseek(struct file *file, loff_t offset, int origin)
+{
+	loff_t err;
+
+	LKTRTrace("%.*s\n", DLNPair(file->f_dentry));
+
+	lockdep_off();
+#if 0
+#else
+	err = vfs_llseek(file, offset, origin);
+#endif
+	lockdep_on();
+	return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+#ifdef CONFIG_AUFS_DLGT
+static inline int need_dlgt(struct super_block *sb)
+{
+	return (au_flag_test(sb, AuFlag_DLGT) && !is_au_wkq(current));
+}
+
+int vfsub_permission(struct inode *inode, int mask, struct nameidata *nd,
+		     int dlgt);
+
+int vfsub_create(struct inode *dir, struct dentry *dentry, int mode,
+		 struct nameidata *nd, int dlgt);
+int vfsub_symlink(struct inode *dir, struct dentry *dentry, const char *symname,
+		  int mode, int dlgt);
+int vfsub_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev,
+		int dlgt);
+int vfsub_link(struct dentry *src_dentry, struct inode *dir,
+	       struct dentry *dentry, int dlgt);
+int vfsub_rename(struct inode *src_dir, struct dentry *src_dentry,
+		 struct inode *dir, struct dentry *dentry, int dlgt);
+int vfsub_mkdir(struct inode *dir, struct dentry *dentry, int mode, int dlgt);
+int vfsub_rmdir(struct inode *dir, struct dentry *dentry, int dlgt);
+
+ssize_t vfsub_read_u(struct file *file, char __user *ubuf, size_t count,
+		     loff_t *ppos, int dlgt);
+ssize_t vfsub_read_k(struct file *file, void *kbuf, size_t count, loff_t *ppos,
+		     int dlgt);
+ssize_t vfsub_write_u(struct file *file, const char __user *ubuf, size_t count,
+		      loff_t *ppos, int dlgt);
+ssize_t vfsub_write_k(struct file *file, void *kbuf, size_t count, loff_t *ppos,
+		      int dlgt);
+int vfsub_readdir(struct file *file, filldir_t filldir, void *arg, int dlgt);
+
+#else
+
+static inline int need_dlgt(struct super_block *sb)
+{
+	return 0;
+}
+
+static inline
+int vfsub_permission(struct inode *inode, int mask, struct nameidata *nd,
+		     int dlgt)
+{
+	return do_vfsub_permission(inode, mask, nd);
+}
+
+static inline
+int vfsub_create(struct inode *dir, struct dentry *dentry, int mode,
+		 struct nameidata *nd, int dlgt)
+{
+	return do_vfsub_create(dir, dentry, mode, nd);
+}
+
+static inline
+int vfsub_symlink(struct inode *dir, struct dentry *dentry, const char *symname,
+		  int mode, int dlgt)
+{
+	return do_vfsub_symlink(dir, dentry, symname, mode);
+}
+
+static inline
+int vfsub_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev,
+		int dlgt)
+{
+	return do_vfsub_mknod(dir, dentry, mode, dev);
+}
+
+static inline
+int vfsub_link(struct dentry *src_dentry, struct inode *dir,
+	       struct dentry *dentry, int dlgt)
+{
+	return do_vfsub_link(src_dentry, dir, dentry);
+}
+
+static inline
+int vfsub_rename(struct inode *src_dir, struct dentry *src_dentry,
+		 struct inode *dir, struct dentry *dentry, int dlgt)
+{
+	return do_vfsub_rename(src_dir, src_dentry, dir, dentry);
+}
+
+static inline
+int vfsub_mkdir(struct inode *dir, struct dentry *dentry, int mode,
+		int dlgt)
+{
+	return do_vfsub_mkdir(dir, dentry, mode);
+}
+
+static inline
+int vfsub_rmdir(struct inode *dir, struct dentry *dentry, int dlgt)
+{
+	return do_vfsub_rmdir(dir, dentry);
+}
+
+static inline
+ssize_t vfsub_read_u(struct file *file, char __user *ubuf, size_t count,
+		     loff_t *ppos, int dlgt)
+{
+	return do_vfsub_read_u(file, ubuf, count, ppos);
+}
+
+static inline
+ssize_t vfsub_read_k(struct file *file, void *kbuf, size_t count, loff_t *ppos,
+		     int dlgt)
+{
+	return do_vfsub_read_k(file, kbuf, count, ppos);
+}
+
+static inline
+ssize_t vfsub_write_u(struct file *file, const char __user *ubuf, size_t count,
+		      loff_t *ppos, int dlgt)
+{
+	return do_vfsub_write_u(file, ubuf, count, ppos);
+}
+
+static inline
+ssize_t vfsub_write_k(struct file *file, void *kbuf, size_t count, loff_t *ppos,
+		      int dlgt)
+{
+	return do_vfsub_write_k(file, kbuf, count, ppos);
+}
+
+static inline
+int vfsub_readdir(struct file *file, filldir_t filldir, void *arg, int dlgt)
+{
+	return do_vfsub_readdir(file, filldir, arg);
+}
+#endif /* CONFIG_AUFS_DLGT */
+
+/* ---------------------------------------------------------------------- */
+
+static inline
+struct dentry *vfsub_lock_rename(struct dentry *d1, struct dentry *d2)
+{
+	struct dentry *d;
+
+	lockdep_off();
+	d = lock_rename(d1, d2);
+	lockdep_on();
+	return d;
+}
+
+static inline void vfsub_unlock_rename(struct dentry *d1, struct dentry *d2)
+{
+	lockdep_off();
+	unlock_rename(d1, d2);
+	lockdep_on();
+}
+
+/* ---------------------------------------------------------------------- */
+
+int vfsub_notify_change(struct dentry *dentry, struct iattr *ia, int dlgt);
+int vfsub_unlink(struct inode *dir, struct dentry *dentry, int dlgt);
+int vfsub_statfs(void *arg, struct kstatfs *buf, int dlgt);
+
+#endif /* __KERNEL__ */
+#endif /* __AUFS_VFSUB_H__ */
diff --git a/fs/aufs/whout.c b/fs/aufs/whout.c
new file mode 100755
index 0000000..b7f874c
--- /dev/null
+++ b/fs/aufs/whout.c
@@ -0,0 +1,933 @@
+/*
+ * Copyright (C) 2005, 2006, 2007 Junjiro Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+/* $Id: whout.c,v 1.14 2007/05/14 03:40:40 sfjro Exp $ */
+
+#include <linux/fs.h>
+#include <linux/namei.h>
+#include <linux/random.h>
+#include <linux/security.h>
+#include "aufs.h"
+
+#define WH_MASK			S_IRUGO
+
+/* If a directory contains this file, then it is opaque.  We start with the
+ * .wh. flag so that it is blocked by lookup.
+ */
+static struct qstr diropq_name = {
+	.name = AUFS_WH_DIROPQ,
+	.len = sizeof(AUFS_WH_DIROPQ) - 1
+};
+
+/*
+ * generate whiteout name, which is NOT terminated by NULL.
+ * @name: original d_name.name
+ * @len: original d_name.len
+ * @wh: whiteout qstr
+ * returns zero when succeeds, otherwise error.
+ * succeeded value as wh->name should be freed by au_free_whname().
+ */
+int au_alloc_whname(const char *name, int len, struct qstr *wh)
+{
+	char *p;
+
+	DEBUG_ON(!name || !len || !wh);
+
+	if (unlikely(len > PATH_MAX - AUFS_WH_PFX_LEN))
+		return -ENAMETOOLONG;
+
+	wh->len = len + AUFS_WH_PFX_LEN;
+	wh->name = p = kmalloc(wh->len, GFP_KERNEL);
+	//if (LktrCond) {kfree(p); wh->name = p = NULL;}
+	if (p) {
+		memcpy(p, AUFS_WH_PFX, AUFS_WH_PFX_LEN);
+		memcpy(p + AUFS_WH_PFX_LEN, name, len);
+		//smp_mb();
+		return 0;
+	}
+	return -ENOMEM;
+}
+
+void au_free_whname(struct qstr *wh)
+{
+	DEBUG_ON(!wh || !wh->name);
+	kfree(wh->name);
+#ifdef CONFIG_AUFS_DEBUG
+	wh->name = NULL;
+#endif
+}
+
+/* ---------------------------------------------------------------------- */
+
+/*
+ * test if the @wh_name exists under @hidden_parent.
+ * @try_sio specifies the necessary of super-io.
+ */
+int is_wh(struct dentry *hidden_parent, struct qstr *wh_name, int try_sio,
+	  struct lkup_args *lkup)
+{
+	int err;
+	struct dentry *wh_dentry;
+	struct inode *hidden_dir;
+
+	LKTRTrace("%.*s/%.*s, lkup{%p, %d}\n", DLNPair(hidden_parent),
+		  wh_name->len, wh_name->name, lkup->nfsmnt, lkup->dlgt);
+	hidden_dir = hidden_parent->d_inode;
+	DEBUG_ON(!S_ISDIR(hidden_dir->i_mode));
+	IMustLock(hidden_dir);
+
+	if (!try_sio)
+		wh_dentry = lkup_one(wh_name->name, hidden_parent,
+				     wh_name->len, lkup);
+	else
+		wh_dentry = sio_lkup_one(wh_name->name, hidden_parent,
+					 wh_name->len, lkup);
+	//if (LktrCond) {dput(wh_dentry); wh_dentry = ERR_PTR(-1);}
+	err = PTR_ERR(wh_dentry);
+	if (IS_ERR(wh_dentry))
+		goto out;
+
+	err = 0;
+	if (!wh_dentry->d_inode)
+		goto out_wh; /* success */
+
+	err = 1;
+	if (S_ISREG(wh_dentry->d_inode->i_mode))
+		goto out_wh; /* success */
+
+	err = -EIO;
+	IOErr("%.*s Invalid whiteout entry type 0%o.\n",
+	      DLNPair(wh_dentry), wh_dentry->d_inode->i_mode);
+
+ out_wh:
+	dput(wh_dentry);
+ out:
+	TraceErr(err);
+	return err;
+}
+
+/*
+ * test if the @hidden_dentry sets opaque or not.
+ */
+int is_diropq(struct dentry *hidden_dentry, struct lkup_args *lkup)
+{
+	int err;
+	struct inode *hidden_dir;
+
+	LKTRTrace("dentry %.*s\n", DLNPair(hidden_dentry));
+	hidden_dir = hidden_dentry->d_inode;
+	DEBUG_ON(!S_ISDIR(hidden_dir->i_mode));
+	IMustLock(hidden_dir);
+
+	err = is_wh(hidden_dentry, &diropq_name, /*try_sio*/1, lkup);
+	TraceErr(err);
+	return err;
+}
+
+/*
+ * returns a negative dentry whose name is unique and temporary.
+ */
+struct dentry *lkup_whtmp(struct dentry *hidden_parent, struct qstr *prefix,
+			  struct lkup_args *lkup)
+{
+#define HEX_LEN 4
+	struct dentry *dentry;
+	int len, i;
+	char defname[AUFS_WH_PFX_LEN * 2 + DNAME_INLINE_LEN_MIN + 1
+		     + HEX_LEN + 1], *name, *p;
+	static unsigned char cnt;
+
+	LKTRTrace("hp %.*s, prefix %.*s\n",
+		  DLNPair(hidden_parent), prefix->len, prefix->name);
+	DEBUG_ON(!hidden_parent->d_inode);
+	IMustLock(hidden_parent->d_inode);
+
+	name = defname;
+	len = sizeof(defname) - DNAME_INLINE_LEN_MIN + prefix->len - 1;
+	if (unlikely(prefix->len > DNAME_INLINE_LEN_MIN)) {
+		dentry = ERR_PTR(-ENAMETOOLONG);
+		if (unlikely(len >= PATH_MAX))
+			goto out;
+		dentry = ERR_PTR(-ENOMEM);
+		name = kmalloc(len + 1, GFP_KERNEL);
+		//if (LktrCond) {kfree(name); name = NULL;}
+		if (unlikely(!name))
+			goto out;
+	}
+
+	// doubly whiteout-ed
+	memcpy(name, AUFS_WH_PFX AUFS_WH_PFX, AUFS_WH_PFX_LEN * 2);
+	p = name + AUFS_WH_PFX_LEN * 2;
+	memcpy(p, prefix->name, prefix->len);
+	p += prefix->len;
+	*p++ = '.';
+	DEBUG_ON(name + len + 1 - p <= HEX_LEN);
+
+	for (i = 0; i < 3; i++) {
+		sprintf(p, "%.*d", HEX_LEN, cnt++);
+		dentry = sio_lkup_one(name, hidden_parent, len, lkup);
+		//if (LktrCond) {dput(dentry); dentry = ERR_PTR(-1);}
+		if (unlikely(IS_ERR(dentry) || !dentry->d_inode))
+			goto out_name;
+		dput(dentry);
+	}
+	//Warn("could not get random name\n");
+	dentry = ERR_PTR(-EEXIST);
+	Dbg("%.*s\n", len, name);
+	BUG();
+
+ out_name:
+	if (unlikely(name != defname))
+		kfree(name);
+ out:
+	TraceErrPtr(dentry);
+	return dentry;
+#undef HEX_LEN
+}
+
+/*
+ * rename the @dentry of @bindex to the whiteouted temporary name.
+ */
+int rename_whtmp(struct dentry *dentry, aufs_bindex_t bindex)
+{
+	int err;
+	struct inode *hidden_dir;
+	struct dentry *hidden_dentry, *hidden_parent, *tmp_dentry;
+	struct super_block *sb;
+	struct lkup_args lkup;
+
+	LKTRTrace("%.*s, b%d\n", DLNPair(dentry), bindex);
+	hidden_dentry = au_h_dptr_i(dentry, bindex);
+	DEBUG_ON(!hidden_dentry || !hidden_dentry->d_inode);
+	hidden_parent = hidden_dentry->d_parent;
+	hidden_dir = hidden_parent->d_inode;
+	IMustLock(hidden_dir);
+
+	sb = dentry->d_sb;
+	lkup.nfsmnt = au_nfsmnt(sb, bindex);
+	lkup.dlgt = need_dlgt(sb);
+	tmp_dentry = lkup_whtmp(hidden_parent, &hidden_dentry->d_name, &lkup);
+	//if (LktrCond) {dput(tmp_dentry); tmp_dentry = ERR_PTR(-1);}
+	err = PTR_ERR(tmp_dentry);
+	if (!IS_ERR(tmp_dentry)) {
+		/* under the same dir, no need to lock_rename() */
+		err = vfsub_rename(hidden_dir, hidden_dentry,
+				   hidden_dir, tmp_dentry, lkup.dlgt);
+		//if (LktrCond) err = -1; //unavailable
+		TraceErr(err);
+		dput(tmp_dentry);
+	}
+
+	TraceErr(err);
+	return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+int au_unlink_wh_dentry(struct inode *hidden_dir, struct dentry *wh_dentry,
+			struct dentry *dentry, int dlgt)
+{
+	int err;
+
+	LKTRTrace("hi%lu, wh %.*s, d %p\n", hidden_dir->i_ino,
+		  DLNPair(wh_dentry), dentry);
+	DEBUG_ON((dentry && dbwh(dentry) == -1)
+		 || !wh_dentry->d_inode
+		 || !S_ISREG(wh_dentry->d_inode->i_mode));
+	IMustLock(hidden_dir);
+
+	err = vfsub_unlink(hidden_dir, wh_dentry, dlgt);
+	//if (LktrCond) err = -1; // unavailable
+	if (!err && dentry)
+		set_dbwh(dentry, -1);
+
+	TraceErr(err);
+	return err;
+}
+
+static int unlink_wh_name(struct dentry *hidden_parent, struct qstr *wh,
+			  struct lkup_args *lkup)
+{
+	int err;
+	struct inode *hidden_dir;
+	struct dentry *hidden_dentry;
+
+	LKTRTrace("%.*s/%.*s\n", DLNPair(hidden_parent), LNPair(wh));
+	hidden_dir = hidden_parent->d_inode;
+	IMustLock(hidden_dir);
+
+	// au_test_perm() is already done
+	hidden_dentry = lkup_one(wh->name, hidden_parent, wh->len, lkup);
+	//if (LktrCond) {dput(hidden_dentry); hidden_dentry = ERR_PTR(-1);}
+	if (!IS_ERR(hidden_dentry)) {
+		err = 0;
+		if (hidden_dentry->d_inode)
+			err = vfsub_unlink(hidden_dir, hidden_dentry,
+					   lkup->dlgt);
+		dput(hidden_dentry);
+	} else
+		err = PTR_ERR(hidden_dentry);
+
+	TraceErr(err);
+	return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+static void clean_wh(struct inode *h_dir, struct dentry *wh)
+{
+	TraceEnter();
+	if (wh->d_inode) {
+		int err = vfsub_unlink(h_dir, wh, /*dlgt*/0);
+		if (unlikely(err))
+			Warn("failed unlink %.*s (%d), ignored.\n",
+			     DLNPair(wh), err);
+	}
+}
+
+static void clean_plink(struct inode *h_dir, struct dentry *plink)
+{
+	TraceEnter();
+	if (plink->d_inode) {
+		int err = vfsub_rmdir(h_dir, plink, /*dlgt*/0);
+		if (unlikely(err))
+			Warn("failed rmdir %.*s (%d), ignored.\n",
+			     DLNPair(plink), err);
+	}
+}
+
+static int test_linkable(struct inode *h_dir)
+{
+	if (h_dir->i_op && h_dir->i_op->link)
+		return 0;
+	return -ENOSYS;
+}
+
+static int plink_dir(struct inode *h_dir, struct dentry *plink)
+{
+	int err;
+
+	err = -EEXIST;
+	if (!plink->d_inode) {
+		int mode = S_IRWXU;
+		if (unlikely(au_is_nfs(plink->d_sb)))
+			mode |= S_IXUGO;
+		err = vfsub_mkdir(h_dir, plink, mode, /*dlgt*/0);
+	} else if (S_ISDIR(plink->d_inode->i_mode))
+		err = 0;
+	else
+		Err("unknown %.*s exists\n", DLNPair(plink));
+
+	return err;
+}
+
+/*
+ * initialize the whiteout base file/dir for @br.
+ */
+int init_wh(struct dentry *h_root, struct aufs_branch *br,
+	    struct vfsmount *nfsmnt, struct super_block *sb)
+{
+	int err;
+	struct dentry *wh, *plink;
+	struct inode *h_dir;
+	static struct qstr base_name[] = {
+		{.name = AUFS_WH_BASENAME, .len = sizeof(AUFS_WH_BASENAME) - 1},
+		{.name = AUFS_WH_PLINKDIR, .len = sizeof(AUFS_WH_PLINKDIR) - 1}
+	};
+	struct lkup_args lkup = {
+		.nfsmnt	= nfsmnt,
+		.dlgt	= 0 // always no dlgt
+	};
+	const int do_plink = au_flag_test(sb, AuFlag_PLINK);
+
+	LKTRTrace("nfsmnt %p\n", nfsmnt);
+	BrWhMustWriteLock(br);
+	SiMustWriteLock(sb);
+	h_dir = h_root->d_inode;
+	IMustLock(h_dir);
+
+	// doubly whiteouted
+	wh = lkup_wh(h_root, base_name + 0, &lkup);
+	//if (LktrCond) {dput(wh); wh = ERR_PTR(-1);}
+	err = PTR_ERR(wh);
+	if (IS_ERR(wh))
+		goto out;
+	DEBUG_ON(br->br_wh && br->br_wh != wh);
+
+	plink = lkup_wh(h_root, base_name + 1, &lkup);
+	err = PTR_ERR(plink);
+	if (IS_ERR(plink))
+		goto out_dput_wh;
+	DEBUG_ON(br->br_plink && br->br_plink != plink);
+
+	dput(br->br_wh);
+	dput(br->br_plink);
+	br->br_wh = br->br_plink = NULL;
+
+	err = 0;
+	switch (br->br_perm) {
+	case AuBr_RR:
+	case AuBr_RO:
+	case AuBr_RRWH:
+	case AuBr_ROWH:
+		clean_wh(h_dir, wh);
+		clean_plink(h_dir, plink);
+		break;
+
+	case AuBr_RWNoLinkWH:
+		clean_wh(h_dir, wh);
+		if (do_plink) {
+			err = test_linkable(h_dir);
+			if (unlikely(err))
+				goto out_nolink;
+
+			err = plink_dir(h_dir, plink);
+			if (unlikely(err))
+				goto out_err;
+			br->br_plink = dget(plink);
+		} else
+			clean_plink(h_dir, plink);
+		break;
+
+	case AuBr_RW:
+		/*
+		 * for the moment, aufs supports the branch filesystem
+		 * which does not support link(2).
+		 * testing on FAT which does not support i_op->setattr() fully either,
+		 * copyup failed.
+		 * finally, such filesystem will not be used as the writable branch.
+		 */
+		err = test_linkable(h_dir);
+		if (unlikely(err))
+			goto out_nolink;
+
+		err = -EEXIST;
+		if (!wh->d_inode)
+			err = vfsub_create(h_dir, wh, WH_MASK, NULL, /*dlgt*/0);
+		else if (S_ISREG(wh->d_inode->i_mode))
+			err = 0;
+		else
+			Err("unknown %.*s/%.*s exists\n",
+			    DLNPair(h_root), DLNPair(wh));
+		if (unlikely(err))
+			goto out_err;
+
+		if (do_plink) {
+			err = plink_dir(h_dir, plink);
+			if (unlikely(err))
+				goto out_err;
+			br->br_plink = dget(plink);
+		} else
+			clean_plink(h_dir, plink);
+		br->br_wh = dget(wh);
+		break;
+
+	default:
+		BUG();
+	}
+
+ out_dput:
+	dput(plink);
+ out_dput_wh:
+	dput(wh);
+ out:
+	TraceErr(err);
+	return err;
+ out_nolink:
+	Err("%.*s doesn't support link(2), use noplink and rw+nolwh\n",
+	    DLNPair(h_root));
+	goto out_dput;
+ out_err:
+	Err("an error(%d) on the writable branch %.*s(%s)\n",
+	    err, DLNPair(h_root), au_sbtype(h_root->d_sb));
+	goto out_dput;
+}
+
+struct reinit_br_wh {
+	struct super_block *sb;
+	struct aufs_branch *br;
+};
+
+static void reinit_br_wh(void *arg)
+{
+	int err;
+	struct reinit_br_wh *a = arg;
+	struct inode *hidden_dir, *dir;
+	struct dentry *hidden_root;
+	aufs_bindex_t bindex;
+
+	TraceEnter();
+	DEBUG_ON(!a->br->br_wh || !a->br->br_wh->d_inode || current->fsuid);
+
+	err = 0;
+	/* big lock */
+	si_write_lock(a->sb);
+	if (unlikely(!br_writable(a->br->br_perm)))
+		goto out;
+	bindex = find_brindex(a->sb, a->br->br_id);
+	if (unlikely(bindex < 0))
+		goto out;
+
+	dir = a->sb->s_root->d_inode;
+	hidden_root = a->br->br_wh->d_parent;
+	hidden_dir = hidden_root->d_inode;
+	DEBUG_ON(!hidden_dir->i_op || !hidden_dir->i_op->link);
+	hdir_lock(hidden_dir, dir, bindex);
+	br_wh_write_lock(a->br);
+	err = vfsub_unlink(hidden_dir, a->br->br_wh, /*dlgt*/0);
+	//if (LktrCond) err = -1;
+	dput(a->br->br_wh);
+	a->br->br_wh = NULL;
+	if (!err)
+		err = init_wh(hidden_root, a->br, au_do_nfsmnt(a->br->br_mnt),
+			      a->sb);
+	br_wh_write_unlock(a->br);
+	hdir_unlock(hidden_dir, dir, bindex);
+
+ out:
+	atomic_dec(&a->br->br_wh_running);
+	br_put(a->br);
+	si_write_unlock(a->sb);
+	au_mntput(a->sb);
+	kfree(arg);
+	if (unlikely(err))
+		IOErr("err %d\n", err);
+}
+
+static void kick_reinit_br_wh(struct super_block *sb, struct aufs_branch *br)
+{
+	int do_dec;
+	struct reinit_br_wh *arg;
+
+	do_dec = 1;
+	if (atomic_inc_return(&br->br_wh_running) != 1)
+		goto out;
+
+	// ignore ENOMEM
+	arg = kmalloc(sizeof(*arg), GFP_KERNEL);
+	if (arg) {
+		// dec(wh_running), kfree(arg) and br_put() in reinit function
+		arg->sb = sb;
+		arg->br = br;
+		br_get(br);
+		/* prohibit umount */
+		au_mntget(sb);
+		au_wkq_nowait(reinit_br_wh, arg, /*dlgt*/0);
+		do_dec = 0;
+	}
+
+ out:
+	if (do_dec)
+		atomic_dec(&br->br_wh_running);
+}
+
+/*
+ * create the whiteoute @wh.
+ */
+static int link_or_create_wh(struct dentry *wh, struct super_block *sb,
+			     aufs_bindex_t bindex)
+{
+	int err, dlgt;
+	struct aufs_branch *br;
+	struct dentry *hidden_parent;
+	struct inode *hidden_dir;
+
+	LKTRTrace("%.*s\n", DLNPair(wh));
+	SiMustReadLock(sb);
+	hidden_parent = wh->d_parent;
+	hidden_dir = hidden_parent->d_inode;
+	IMustLock(hidden_dir);
+
+	dlgt = need_dlgt(sb);
+	br = stobr(sb, bindex);
+	br_wh_read_lock(br);
+	if (br->br_wh) {
+		err = vfsub_link(br->br_wh, hidden_dir, wh, dlgt);
+		if (!err || err != -EMLINK)
+			goto out;
+
+		// link count full. re-initialize br_wh.
+		kick_reinit_br_wh(sb, br);
+	}
+
+	// return this error in this context
+	err = vfsub_create(hidden_dir, wh, WH_MASK, NULL, dlgt);
+
+ out:
+	br_wh_read_unlock(br);
+	TraceErr(err);
+	return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+/*
+ * create or remove the diropq.
+ */
+static struct dentry *do_diropq(struct dentry *dentry, aufs_bindex_t bindex,
+				int do_create, int dlgt)
+{
+	struct dentry *opq_dentry, *hidden_dentry;
+	struct inode *hidden_dir;
+	int err;
+	struct super_block *sb;
+	struct lkup_args lkup;
+
+	LKTRTrace("%.*s, bindex %d, do_create %d\n", DLNPair(dentry),
+		  bindex, do_create);
+	hidden_dentry = au_h_dptr_i(dentry, bindex);
+	DEBUG_ON(!hidden_dentry);
+	hidden_dir = hidden_dentry->d_inode;
+	DEBUG_ON(!hidden_dir || !S_ISDIR(hidden_dir->i_mode));
+	IMustLock(hidden_dir);
+
+	// already checked by au_test_perm().
+	sb = dentry->d_sb;
+	lkup.nfsmnt = au_nfsmnt(sb, bindex);
+	lkup.dlgt = dlgt;
+	opq_dentry = lkup_one(diropq_name.name, hidden_dentry, diropq_name.len,
+			      &lkup);
+	//if (LktrCond) {dput(opq_dentry); opq_dentry = ERR_PTR(-1);}
+	if (IS_ERR(opq_dentry))
+		goto out;
+
+	if (do_create) {
+		DEBUG_ON(opq_dentry->d_inode);
+		err = link_or_create_wh(opq_dentry, sb, bindex);
+		//if (LktrCond) {vfs_unlink(hidden_dir, opq_dentry); err = -1;}
+		if (!err) {
+			set_dbdiropq(dentry, bindex);
+			goto out; /* success */
+		}
+	} else {
+		DEBUG_ON(/* !S_ISDIR(dentry->d_inode->i_mode)
+			  * ||  */!opq_dentry->d_inode);
+		err = vfsub_unlink(hidden_dir, opq_dentry, lkup.dlgt);
+		//if (LktrCond) err = -1;
+		if (!err)
+			set_dbdiropq(dentry, -1);
+	}
+	dput(opq_dentry);
+	opq_dentry = ERR_PTR(err);
+
+ out:
+	TraceErrPtr(opq_dentry);
+	return opq_dentry;
+}
+
+struct do_diropq_args {
+	struct dentry **errp;
+	struct dentry *dentry;
+	aufs_bindex_t bindex;
+	int do_create, dlgt;
+};
+
+static void call_do_diropq(void *args)
+{
+	struct do_diropq_args *a = args;
+	*a->errp = do_diropq(a->dentry, a->bindex, a->do_create, a->dlgt);
+}
+
+struct dentry *sio_diropq(struct dentry *dentry, aufs_bindex_t bindex,
+			  int do_create, int dlgt)
+{
+	struct dentry *diropq, *hidden_dentry;
+
+	LKTRTrace("%.*s, bindex %d, do_create %d\n",
+		  DLNPair(dentry), bindex, do_create);
+
+	hidden_dentry = au_h_dptr_i(dentry, bindex);
+	if (!au_test_perm(hidden_dentry->d_inode, MAY_EXEC | MAY_WRITE, dlgt))
+		diropq = do_diropq(dentry, bindex, do_create, dlgt);
+	else {
+		struct do_diropq_args args = {
+			.errp		= &diropq,
+			.dentry		= dentry,
+			.bindex		= bindex,
+			.do_create	= do_create,
+			.dlgt		= dlgt
+		};
+		au_wkq_wait(call_do_diropq, &args, /*dlgt*/0);
+	}
+
+	TraceErrPtr(diropq);
+	return diropq;
+}
+
+/* ---------------------------------------------------------------------- */
+
+/*
+ * lookup whiteout dentry.
+ * @hidden_parent: hidden parent dentry which must exist and be locked
+ * @base_name: name of dentry which will be whiteouted
+ * returns dentry for whiteout.
+ */
+struct dentry *lkup_wh(struct dentry *hidden_parent, struct qstr *base_name,
+		       struct lkup_args *lkup)
+{
+	int err;
+	struct qstr wh_name;
+	struct dentry *wh_dentry;
+
+	LKTRTrace("%.*s/%.*s\n", DLNPair(hidden_parent), LNPair(base_name));
+	IMustLock(hidden_parent->d_inode);
+
+	err = au_alloc_whname(base_name->name, base_name->len, &wh_name);
+	//if (LktrCond) {au_free_whname(&wh_name); err = -1;}
+	wh_dentry = ERR_PTR(err);
+	if (!err) {
+		// do not superio.
+		wh_dentry = lkup_one(wh_name.name, hidden_parent, wh_name.len,
+				     lkup);
+		au_free_whname(&wh_name);
+	}
+	TraceErrPtr(wh_dentry);
+	return wh_dentry;
+}
+
+/*
+ * link/create a whiteout for @dentry on @bindex.
+ */
+struct dentry *simple_create_wh(struct dentry *dentry, aufs_bindex_t bindex,
+				struct dentry *hidden_parent,
+				struct lkup_args *lkup)
+{
+	struct dentry *wh_dentry;
+	int err;
+	struct super_block *sb;
+
+	LKTRTrace("%.*s/%.*s on b%d\n", DLNPair(hidden_parent),
+		  DLNPair(dentry), bindex);
+
+	sb = dentry->d_sb;
+	wh_dentry = lkup_wh(hidden_parent, &dentry->d_name, lkup);
+	//au_nfsmnt(sb, bindex), need_dlgt(sb));
+	//if (LktrCond) {dput(wh_dentry); wh_dentry = ERR_PTR(-1);}
+	if (!IS_ERR(wh_dentry) && !wh_dentry->d_inode) {
+		IMustLock(hidden_parent->d_inode);
+		err = link_or_create_wh(wh_dentry, sb, bindex);
+		if (!err)
+			set_dbwh(dentry, bindex);
+		else {
+			dput(wh_dentry);
+			wh_dentry = ERR_PTR(err);
+		}
+	}
+
+	TraceErrPtr(wh_dentry);
+	return wh_dentry;
+}
+
+/* ---------------------------------------------------------------------- */
+
+/* Delete all whiteouts in this directory in branch bindex. */
+static int del_wh_children(struct aufs_nhash *whlist,
+			   struct dentry *hidden_parent, aufs_bindex_t bindex,
+			   struct lkup_args *lkup)
+{
+	int err, i;
+	struct qstr wh_name;
+	char *p;
+	struct inode *hidden_dir;
+	struct hlist_head *head;
+	struct aufs_wh *tpos;
+	struct hlist_node *pos;
+	struct aufs_destr *str;
+
+	LKTRTrace("%.*s\n", DLNPair(hidden_parent));
+	hidden_dir = hidden_parent->d_inode;
+	IMustLock(hidden_dir);
+	DEBUG_ON(IS_RDONLY(hidden_dir));
+	//SiMustReadLock(??);
+
+	err = -ENOMEM;
+	wh_name.name = p = __getname();
+	//if (LktrCond) {__putname(p); wh_name.name = p = NULL;}
+	if (unlikely(!wh_name.name))
+		goto out;
+	memcpy(p, AUFS_WH_PFX, AUFS_WH_PFX_LEN);
+	p += AUFS_WH_PFX_LEN;
+
+	// already checked by au_test_perm().
+	err = 0;
+	for (i = 0; !err && i < AUFS_NHASH_SIZE; i++) {
+		head = whlist->heads + i;
+		hlist_for_each_entry(tpos, pos, head, wh_hash) {
+			if (tpos->wh_bindex != bindex)
+				continue;
+			str = &tpos->wh_str;
+			if (str->len + AUFS_WH_PFX_LEN <= PATH_MAX) {
+				memcpy(p, str->name, str->len);
+				wh_name.len = AUFS_WH_PFX_LEN + str->len;
+				err = unlink_wh_name(hidden_parent, &wh_name,
+						     lkup);
+				//if (LktrCond) err = -1;
+				if (!err)
+					continue;
+				break;
+			}
+			IOErr("whiteout name too long %.*s\n",
+			      str->len, str->name);
+			err = -EIO;
+			break;
+		}
+	}
+	__putname(wh_name.name);
+
+ out:
+	TraceErr(err);
+	return err;
+}
+
+struct del_wh_children_args {
+	int *errp;
+	struct aufs_nhash *whlist;
+	struct dentry *hidden_parent;
+	aufs_bindex_t bindex;
+	struct lkup_args *lkup;
+};
+
+static void call_del_wh_children(void *args)
+{
+	struct del_wh_children_args *a = args;
+	*a->errp = del_wh_children(a->whlist, a->hidden_parent, a->bindex,
+				   a->lkup);
+}
+
+/* ---------------------------------------------------------------------- */
+
+/*
+ * rmdir the whiteouted temporary named dir @hidden_dentry.
+ * @whlist: whiteouted children.
+ */
+int rmdir_whtmp(struct dentry *hidden_dentry, struct aufs_nhash *whlist,
+		aufs_bindex_t bindex, struct inode *dir, struct inode *inode)
+{
+	int err;
+	struct inode *hidden_inode, *hidden_dir;
+	struct lkup_args lkup;
+	struct super_block *sb;
+
+	LKTRTrace("hd %.*s, b%d, i%lu\n",
+		  DLNPair(hidden_dentry), bindex, dir->i_ino);
+	IMustLock(dir);
+	IiMustAnyLock(dir);
+	hidden_dir = hidden_dentry->d_parent->d_inode;
+	IMustLock(hidden_dir);
+
+	sb = inode->i_sb;
+	lkup.nfsmnt = au_nfsmnt(sb, bindex);
+	lkup.dlgt = need_dlgt(sb);
+	hidden_inode = hidden_dentry->d_inode;
+	DEBUG_ON(hidden_inode != au_h_iptr_i(inode, bindex));
+	hdir2_lock(hidden_inode, inode, bindex);
+	if (!au_test_perm(hidden_inode, MAY_EXEC | MAY_WRITE, lkup.dlgt))
+		err = del_wh_children(whlist, hidden_dentry, bindex, &lkup);
+	else {
+		// ugly
+		int dlgt = lkup.dlgt;
+		struct del_wh_children_args args = {
+			.errp		= &err,
+			.whlist		= whlist,
+			.hidden_parent	= hidden_dentry,
+			.bindex		= bindex,
+			.lkup		= &lkup
+		};
+
+		lkup.dlgt = 0;
+		au_wkq_wait(call_del_wh_children, &args, /*dlgt*/0);
+		lkup.dlgt = dlgt;
+	}
+	hdir_unlock(hidden_inode, inode, bindex);
+
+	if (!err) {
+		err = vfsub_rmdir(hidden_dir, hidden_dentry, lkup.dlgt);
+		//d_drop(hidden_dentry);
+		//if (LktrCond) err = -1;
+	}
+
+	if (!err) {
+		if (ibstart(dir) == bindex) {
+			au_cpup_attr_timesizes(dir);
+			//au_cpup_attr_nlink(dir);
+			dir->i_nlink--;
+		}
+		return 0; /* success */
+	}
+
+	Warn("failed removing %.*s(%d), ignored\n",
+	     DLNPair(hidden_dentry), err);
+	return err;
+}
+
+static void do_rmdir_whtmp(void *arg)
+{
+	int err;
+	struct rmdir_whtmp_arg *a = arg;
+	struct super_block *sb;
+
+	LKTRTrace("%.*s, b%d, dir i%lu\n",
+		  DLNPair(a->h_dentry), a->bindex, a->dir->i_ino);
+
+	i_lock(a->dir);
+	sb = a->dir->i_sb;
+	si_read_lock(sb);
+	err = test_ro(sb, a->bindex, NULL);
+	if (!err) {
+		struct inode *hidden_dir = a->h_dentry->d_parent->d_inode;
+
+		ii_write_lock_child(a->inode);
+		ii_write_lock_parent(a->dir);
+		hdir_lock(hidden_dir, a->dir, a->bindex);
+		err = rmdir_whtmp(a->h_dentry, &a->whlist, a->bindex,
+				  a->dir, a->inode);
+		hdir_unlock(hidden_dir, a->dir, a->bindex);
+		ii_write_unlock(a->dir);
+		ii_write_unlock(a->inode);
+	}
+	dput(a->h_dentry);
+	nhash_fin(&a->whlist);
+	iput(a->inode);
+	si_read_unlock(sb);
+	au_mntput(sb);
+	i_unlock(a->dir);
+	iput(a->dir);
+	kfree(arg);
+	if (unlikely(err))
+		IOErr("err %d\n", err);
+}
+
+void kick_rmdir_whtmp(struct dentry *hidden_dentry, struct aufs_nhash *whlist,
+		      aufs_bindex_t bindex, struct inode *dir,
+		      struct inode *inode, struct rmdir_whtmp_arg *arg)
+{
+	LKTRTrace("%.*s\n", DLNPair(hidden_dentry));
+	IMustLock(dir);
+
+	// all post-process will be done in do_rmdir_whtmp().
+	arg->h_dentry = dget(hidden_dentry);
+	nhash_init(&arg->whlist);
+	nhash_move(&arg->whlist, whlist);
+	arg->bindex = bindex;
+	arg->dir = igrab(dir);
+	arg->inode = igrab(inode);
+	/* prohibit umount */
+	au_mntget(dir->i_sb);
+
+	au_wkq_nowait(do_rmdir_whtmp, arg, /*dlgt*/0);
+}
diff --git a/fs/aufs/whout.h b/fs/aufs/whout.h
new file mode 100755
index 0000000..d44c3cd
--- /dev/null
+++ b/fs/aufs/whout.h
@@ -0,0 +1,87 @@
+/*
+ * Copyright (C) 2005, 2006, 2007 Junjiro Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+/* $Id: whout.h,v 1.8 2007/05/14 03:41:52 sfjro Exp $ */
+
+#ifndef __AUFS_WHOUT_H__
+#define __AUFS_WHOUT_H__
+
+#ifdef __KERNEL__
+
+#include <linux/fs.h>
+#include <linux/aufs_type.h>
+
+int au_alloc_whname(const char *name, int len, struct qstr *wh);
+void au_free_whname(struct qstr *wh);
+
+struct lkup_args;
+int is_wh(struct dentry *h_parent, struct qstr *wh_name, int try_sio,
+	  struct lkup_args *lkup);
+int is_diropq(struct dentry *h_dentry, struct lkup_args *lkup);
+
+struct dentry *lkup_whtmp(struct dentry *h_parent, struct qstr *prefix,
+			  struct lkup_args *lkup);
+int rename_whtmp(struct dentry *dentry, aufs_bindex_t bindex);
+int au_unlink_wh_dentry(struct inode *h_dir, struct dentry *wh_dentry,
+			struct dentry *dentry, int dlgt);
+
+struct aufs_branch;
+int init_wh(struct dentry *h_parent, struct aufs_branch *br,
+	    struct vfsmount *nfsmnt, struct super_block *sb);
+
+struct dentry *sio_diropq(struct dentry *dentry, aufs_bindex_t bindex,
+			  int do_create, int dlgt);
+
+struct dentry *lkup_wh(struct dentry *h_parent, struct qstr *base_name,
+		       struct lkup_args *lkup);
+struct dentry *simple_create_wh(struct dentry *dentry, aufs_bindex_t bindex,
+				struct dentry *h_parent,
+				struct lkup_args *lkup);
+
+/* real rmdir the whiteout-ed dir */
+struct rmdir_whtmp_arg {
+	struct dentry *h_dentry;
+	struct aufs_nhash whlist;
+	aufs_bindex_t bindex;
+	struct inode *dir, *inode;
+};
+
+struct aufs_nhash;
+int rmdir_whtmp(struct dentry *h_dentry, struct aufs_nhash *whlist,
+		aufs_bindex_t bindex, struct inode *dir, struct inode *inode);
+void kick_rmdir_whtmp(struct dentry *h_dentry, struct aufs_nhash *whlist,
+		      aufs_bindex_t bindex, struct inode *dir,
+		      struct inode *inode, struct rmdir_whtmp_arg *arg);
+
+/* ---------------------------------------------------------------------- */
+
+static inline
+struct dentry *create_diropq(struct dentry *dentry, aufs_bindex_t bindex,
+			     int dlgt)
+{
+	return sio_diropq(dentry, bindex, 1, dlgt);
+}
+
+static inline
+int remove_diropq(struct dentry *dentry, aufs_bindex_t bindex, int dlgt)
+{
+	return PTR_ERR(sio_diropq(dentry, bindex, 0, dlgt));
+}
+
+#endif /* __KERNEL__ */
+#endif /* __AUFS_WHOUT_H__ */
diff --git a/fs/aufs/wkq.c b/fs/aufs/wkq.c
new file mode 100755
index 0000000..b5ab023
--- /dev/null
+++ b/fs/aufs/wkq.c
@@ -0,0 +1,283 @@
+/*
+ * Copyright (C) 2005, 2006, 2007 Junjiro Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+/* $Id: wkq.c,v 1.14 2007/05/14 03:39:10 sfjro Exp $ */
+
+#include <linux/module.h>
+#include "aufs.h"
+
+struct au_wkq *au_wkq;
+
+struct au_cred {
+#ifdef CONFIG_AUFS_DLGT
+	uid_t fsuid;
+	gid_t fsgid;
+	kernel_cap_t cap_effective, cap_inheritable, cap_permitted;
+	//unsigned keep_capabilities:1;
+	//struct user_struct *user;
+	//struct fs_struct *fs;
+	//struct nsproxy *nsproxy;
+#endif
+};
+
+struct au_wkinfo {
+	struct work_struct wk;
+
+	unsigned int wait:1;
+	unsigned int dlgt:1;
+	struct au_cred cred;
+
+	au_wkq_func_t func;
+	void *args;
+
+	atomic_t *busyp;
+	struct completion *comp;
+};
+
+/* ---------------------------------------------------------------------- */
+
+#ifdef CONFIG_AUFS_DLGT
+static void cred_store(struct au_cred *cred)
+{
+	cred->fsuid = current->fsuid;
+	cred->fsgid = current->fsgid;
+	cred->cap_effective = current->cap_effective;
+	cred->cap_inheritable = current->cap_inheritable;
+	cred->cap_permitted = current->cap_permitted;
+}
+
+static void cred_revert(struct au_cred *cred)
+{
+	DEBUG_ON(!is_au_wkq(current));
+	current->fsuid = cred->fsuid;
+	current->fsgid = cred->fsgid;
+	current->cap_effective = cred->cap_effective;
+	current->cap_inheritable = cred->cap_inheritable;
+	current->cap_permitted = cred->cap_permitted;
+}
+
+static void cred_switch(struct au_cred *old, struct au_cred *new)
+{
+	cred_store(old);
+	cred_revert(new);
+}
+#endif
+
+/* ---------------------------------------------------------------------- */
+
+static void update_busy(struct au_wkq *wkq, struct au_wkinfo *wkinfo)
+{
+#ifdef CONFIG_AUFS_SYSAUFS
+	unsigned int new, old;
+
+	do {
+		new = atomic_read(wkinfo->busyp);
+		old = wkq->max_busy;
+		if (new <= old)
+			break;
+	} while (cmpxchg(&wkq->max_busy, old, new) == old);
+#endif
+}
+
+static int enqueue(struct au_wkq *wkq, struct au_wkinfo *wkinfo)
+{
+	wkinfo->busyp = &wkq->busy;
+	update_busy(wkq, wkinfo);
+	if (wkinfo->wait)
+		return !queue_work(wkq->q, &wkinfo->wk);
+	else
+		return !schedule_work(&wkinfo->wk);
+}
+
+static void do_wkq(struct au_wkinfo *wkinfo)
+{
+	unsigned int idle, n;
+	int i, idle_idx;
+
+	TraceEnter();
+
+	while (1) {
+		if (wkinfo->wait) {
+			idle_idx = 0;
+			idle = UINT_MAX;
+			for (i = 0; i < aufs_nwkq; i++) {
+				n = atomic_inc_return(&au_wkq[i].busy);
+				if (n == 1 && !enqueue(au_wkq + i, wkinfo))
+					return; /* success */
+
+				if (n < idle) {
+					idle_idx = i;
+					idle = n;
+				}
+				atomic_dec(&au_wkq[i].busy);
+			}
+		} else
+			idle_idx = aufs_nwkq;
+
+		atomic_inc(&au_wkq[idle_idx].busy);
+		if (!enqueue(au_wkq + idle_idx, wkinfo))
+			return; /* success */
+
+		/* impossible? */
+		Warn1("failed to queue_work()\n");
+		yield();
+	}
+}
+
+static AuWkqFunc(wkq_func, wk)
+{
+	struct au_wkinfo *wkinfo = container_of(wk, struct au_wkinfo, wk);
+
+	LKTRTrace("wkinfo{%u, %u, %p, %p, %p}\n",
+		  wkinfo->wait, wkinfo->dlgt, wkinfo->func, wkinfo->busyp,
+		  wkinfo->comp);
+#ifdef CONFIG_AUFS_DLGT
+	if (!wkinfo->dlgt)
+		wkinfo->func(wkinfo->args);
+	else {
+		struct au_cred cred;
+		cred_switch(&cred, &wkinfo->cred);
+		wkinfo->func(wkinfo->args);
+		cred_revert(&cred);
+	}
+#else
+	wkinfo->func(wkinfo->args);
+#endif
+	atomic_dec(wkinfo->busyp);
+	if (wkinfo->wait)
+		complete(wkinfo->comp);
+	else {
+		kfree(wkinfo);
+		module_put(THIS_MODULE);
+	}
+}
+
+void au_wkq_run(au_wkq_func_t func, void *args, int dlgt, int do_wait)
+{
+	DECLARE_COMPLETION_ONSTACK(comp);
+	struct au_wkinfo _wkinfo = {
+		.wait	= 1,
+		.dlgt	= !!dlgt,
+		.func	= func,
+		.args	= args,
+		.comp	= &comp
+	}, *wkinfo = &_wkinfo;
+
+	LKTRTrace("dlgt %d, do_wait %d\n", dlgt, do_wait);
+	DEBUG_ON(is_au_wkq(current));
+
+	if (unlikely(!do_wait)) {
+		static DECLARE_WAIT_QUEUE_HEAD(wq);
+		/*
+		 * never fail.
+		 * wkq_func() must free this wkinfo.
+		 * it highly depends upon the implementation of workqueue.
+		 */
+		wait_event(wq, (wkinfo = kmalloc(sizeof(*wkinfo), GFP_KERNEL)));
+		wkinfo->wait = 0;
+		wkinfo->dlgt = !!dlgt;
+		wkinfo->func = func;
+		wkinfo->args = args;
+		wkinfo->comp = NULL;
+		__module_get(THIS_MODULE);
+	}
+
+	AuInitWkq(&wkinfo->wk, wkq_func);
+#ifdef CONFIG_AUFS_DLGT
+	if (dlgt)
+		cred_store(&wkinfo->cred);
+#endif
+	do_wkq(wkinfo);
+	if (do_wait)
+		wait_for_completion(wkinfo->comp);
+}
+
+#if 0
+void au_wkq_wait_nwtask(void)
+{
+	static DECLARE_WAIT_QUEUE_HEAD(wq);
+	wait_event(wq, !atomic_read(&au_wkq[aufs_nwkq].busy));
+}
+#endif
+
+void au_wkq_fin(void)
+{
+	int i;
+
+	TraceEnter();
+
+	for (i = 0; i < aufs_nwkq; i++)
+		if (au_wkq[i].q && !IS_ERR(au_wkq[i].q))
+			destroy_workqueue(au_wkq[i].q);
+	kfree(au_wkq);
+}
+
+int __init au_wkq_init(void)
+{
+	int err, i;
+	struct au_wkq *nowaitq;
+
+	LKTRTrace("%d\n", aufs_nwkq);
+
+	/* '+1' is for accounting  of nowait queue */
+	err = -ENOMEM;
+	au_wkq = kcalloc(aufs_nwkq + 1, sizeof(*au_wkq), GFP_KERNEL);
+	if (unlikely(!au_wkq))
+		goto out;
+
+	err = 0;
+	for (i = 0; i < aufs_nwkq; i++) {
+		au_wkq[i].q = create_singlethread_workqueue(AUFS_WKQ_NAME);
+		if (au_wkq[i].q && !IS_ERR(au_wkq[i].q)) {
+			atomic_set(&au_wkq[i].busy, 0);
+			au_wkq[i].max_busy = 0;
+			continue;
+		}
+
+		err = PTR_ERR(au_wkq[i].q);
+		au_wkq_fin();
+		break;
+	}
+
+	/* nowait accounting */
+	nowaitq = au_wkq + aufs_nwkq;
+	atomic_set(&nowaitq->busy, 0);
+	nowaitq->max_busy = 0;
+	nowaitq->q = NULL;
+
+#if 0 // test accouting
+	if (!err) {
+		static void f(void *args) {
+			DbgSleep(1);
+		}
+		int i;
+		//au_debug_on();
+		LKTRTrace("f %p\n", f);
+		for (i = 0; i < 10; i++)
+			au_wkq_nowait(f, NULL, 0);
+		for (i = 0; i < aufs_nwkq; i++)
+			au_wkq_wait(f, NULL, 0);
+		DbgSleep(11);
+		//au_debug_off();
+	}
+#endif
+
+ out:
+	TraceErr(err);
+	return err;
+}
diff --git a/fs/aufs/wkq.h b/fs/aufs/wkq.h
new file mode 100755
index 0000000..cc1bb25
--- /dev/null
+++ b/fs/aufs/wkq.h
@@ -0,0 +1,81 @@
+/*
+ * Copyright (C) 2005, 2006, 2007 Junjiro Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+/* $Id: wkq.h,v 1.9 2007/05/14 03:39:10 sfjro Exp $ */
+
+#ifndef __AUFS_WKQ_H__
+#define __AUFS_WKQ_H__
+
+#ifdef __KERNEL__
+
+#include <linux/sched.h>
+#include <linux/version.h>
+#include <linux/workqueue.h>
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,18)
+#define DECLARE_COMPLETION_ONSTACK(work) DECLARE_COMPLETION(work)
+#endif
+
+/* ---------------------------------------------------------------------- */
+
+/* internal workqueue named AUFS_WKQ_NAME */
+struct au_wkq {
+	struct workqueue_struct *q;
+
+	/* accounting */
+	atomic_t busy;
+	unsigned int max_busy;
+} ;//__attribute__ ((aligned));
+
+typedef void (*au_wkq_func_t)(void *args);
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,20)
+#define AuInitWkq(wk, func)	INIT_WORK(wk, func)
+#define AuWkqFunc(name, arg)	void name(struct work_struct *arg)
+#else
+typedef void (*work_func_t)(void *arg);
+#define AuInitWkq(wk, func)	INIT_WORK(wk, func, wk)
+#define AuWkqFunc(name, arg)	void name(void *arg)
+#endif
+
+extern struct au_wkq *au_wkq;
+
+void au_wkq_run(au_wkq_func_t func, void *args, int dlgt, int do_wait);
+//void au_wkq_wait_nwtask(void);
+int __init au_wkq_init(void);
+void au_wkq_fin(void);
+
+/* ---------------------------------------------------------------------- */
+
+static inline int is_au_wkq(struct task_struct *tsk)
+{
+	return (!tsk->mm && !strcmp(current->comm, AUFS_WKQ_NAME));
+}
+
+static inline void au_wkq_wait(au_wkq_func_t func, void *args, int dlgt)
+{
+	au_wkq_run(func, args, dlgt, /*do_wait*/1);
+}
+
+static inline void au_wkq_nowait(au_wkq_func_t func, void *args, int dlgt)
+{
+	au_wkq_run(func, args, dlgt, /*do_wait*/0);
+}
+
+#endif /* __KERNEL__ */
+#endif /* __AUFS_WKQ_H__ */
diff --git a/fs/aufs/xino.c b/fs/aufs/xino.c
new file mode 100755
index 0000000..145491e
--- /dev/null
+++ b/fs/aufs/xino.c
@@ -0,0 +1,644 @@
+/*
+ * Copyright (C) 2005, 2006, 2007 Junjiro Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+/* $Id: xino.c,v 1.27 2007/05/14 03:39:10 sfjro Exp $ */
+
+//#include <linux/fs.h>
+#include <linux/fsnotify.h>
+#include <asm/uaccess.h>
+#include "aufs.h"
+
+static readf_t find_readf(struct file *h_file)
+{
+	const struct file_operations *fop = h_file->f_op;
+
+	if (fop) {
+		if (fop->read)
+			return fop->read;
+		if (fop->aio_read)
+			return do_sync_read;
+	}
+	return ERR_PTR(-ENOSYS);
+}
+
+static writef_t find_writef(struct file *h_file)
+{
+	const struct file_operations *fop = h_file->f_op;
+
+	if (fop) {
+		if (fop->write)
+			return fop->write;
+		if (fop->aio_write)
+			return do_sync_write;
+	}
+	return ERR_PTR(-ENOSYS);
+}
+
+/* ---------------------------------------------------------------------- */
+
+static ssize_t xino_fread(readf_t func, struct file *file, void *buf,
+			  size_t size, loff_t *pos)
+{
+	ssize_t err;
+	mm_segment_t oldfs;
+
+	LKTRTrace("%.*s, sz %lu, *pos %Ld\n",
+		  DLNPair(file->f_dentry), (unsigned long)size, *pos);
+
+	oldfs = get_fs();
+	set_fs(KERNEL_DS);
+	do {
+		err = func(file, (char __user*)buf, size, pos);
+	} while (err == -EAGAIN || err == -EINTR);
+	set_fs(oldfs);
+
+#if 0
+	if (err > 0)
+		fsnotify_access(file->f_dentry);
+#endif
+
+	TraceErr(err);
+	return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+static ssize_t do_xino_fwrite(writef_t func, struct file *file, void *buf,
+			      size_t size, loff_t *pos)
+{
+	ssize_t err;
+	mm_segment_t oldfs;
+
+	lockdep_off();
+	oldfs = get_fs();
+	set_fs(KERNEL_DS);
+	do {
+		err = func(file, (const char __user*)buf, size, pos);
+	} while (err == -EAGAIN || err == -EINTR);
+	set_fs(oldfs);
+	lockdep_on();
+
+#if 0
+	if (err > 0)
+		fsnotify_modify(file->f_dentry);
+#endif
+
+	TraceErr(err);
+	return err;
+}
+
+struct do_xino_fwrite_args {
+	ssize_t *errp;
+	writef_t func;
+	struct file *file;
+	void *buf;
+	size_t size;
+	loff_t *pos;
+};
+
+static void call_do_xino_fwrite(void *args)
+{
+	struct do_xino_fwrite_args *a = args;
+	*a->errp = do_xino_fwrite(a->func, a->file, a->buf, a->size, a->pos);
+}
+
+static ssize_t xino_fwrite(writef_t func, struct file *file, void *buf,
+			   size_t size, loff_t *pos)
+{
+	ssize_t err;
+
+	LKTRTrace("%.*s, sz %lu, *pos %Ld\n",
+		  DLNPair(file->f_dentry), (unsigned long)size, *pos);
+
+	// signal block and no wkq?
+	/*
+	 * it breaks RLIMIT_FSIZE and normal user's limit,
+	 * users should care about quota and real 'filesystem full.'
+	 */
+	if (!is_au_wkq(current)) {
+		struct do_xino_fwrite_args args = {
+			.errp	= &err,
+			.func	= func,
+			.file	= file,
+			.buf	= buf,
+			.size	= size,
+			.pos	= pos
+		};
+		au_wkq_wait(call_do_xino_fwrite, &args, /*dlgt*/0);
+	} else
+		err = do_xino_fwrite(func, file, buf, size, pos);
+
+	TraceErr(err);
+	return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+/*
+ * write @ino to the xinofile for the specified branch{@sb, @bindex}
+ * at the position of @_ino.
+ * when @ino is zero, it is written to the xinofile and means no entry.
+ */
+int xino_write(struct super_block *sb, aufs_bindex_t bindex, ino_t h_ino,
+	       struct xino *xino)
+{
+	struct aufs_branch *br;
+	loff_t pos;
+	ssize_t sz;
+
+	LKTRTrace("b%d, hi%lu, i%lu\n", bindex, h_ino, xino->ino);
+	//DEBUG_ON(!xino->ino /* || !xino->h_gen */);
+	//WARN_ON(bindex == 0 && h_ino == 31);
+
+	if (unlikely(!au_flag_test(sb, AuFlag_XINO)))
+		return 0;
+
+	br = stobr(sb, bindex);
+	DEBUG_ON(!br || !br->br_xino);
+	pos = h_ino * sizeof(*xino);
+	sz = xino_fwrite(br->br_xino_write, br->br_xino, xino, sizeof(*xino),
+			 &pos);
+	//if (LktrCond) sz = 1;
+	if (sz == sizeof(*xino))
+		return 0; /* success */
+
+	IOErr("write failed (%ld)\n", (long)sz);
+	return -EIO;
+}
+
+int xino_write0(struct super_block *sb, aufs_bindex_t bindex, ino_t h_ino)
+{
+	struct xino xino = {
+		.ino	= 0
+	};
+	return xino_write(sb, bindex, h_ino, &xino);
+}
+
+// why is not atomic_long_inc_return defined?
+static DEFINE_SPINLOCK(alir_lock);
+static long atomic_long_inc_return(atomic_long_t *a)
+{
+	long l;
+
+	spin_lock(&alir_lock);
+	atomic_long_inc(a);
+	l = atomic_long_read(a);
+	spin_unlock(&alir_lock);
+	return l;
+}
+
+ino_t xino_new_ino(struct super_block *sb)
+{
+	ino_t ino;
+
+	TraceEnter();
+	ino = atomic_long_inc_return(&stosi(sb)->si_xino);
+	BUILD_BUG_ON(AUFS_FIRST_INO < AUFS_ROOT_INO);
+	if (ino >= AUFS_ROOT_INO)
+		return ino;
+	else {
+		atomic_long_dec(&stosi(sb)->si_xino);
+		IOErr1("inode number overflow\n");
+		return 0;
+	}
+}
+
+/*
+ * read @ino from xinofile for the specified branch{@sb, @bindex}
+ * at the position of @h_ino.
+ * if @ino does not exist and @do_new is true, get new one.
+ */
+int xino_read(struct super_block *sb, aufs_bindex_t bindex, ino_t h_ino,
+	      struct xino *xino)
+{
+	int err;
+	struct aufs_branch *br;
+	struct file *file;
+	loff_t pos;
+	ssize_t sz;
+
+	LKTRTrace("b%d, hi%lu\n", bindex, h_ino);
+
+	err = 0;
+	xino->ino = 0;
+	if (unlikely(!au_flag_test(sb, AuFlag_XINO)))
+		return 0; /* no ino */
+
+	br = stobr(sb, bindex);
+	file = br->br_xino;
+	DEBUG_ON(!file);
+	pos = h_ino * sizeof(*xino);
+	if (i_size_read(file->f_dentry->d_inode) < pos + sizeof(*xino))
+		return 0; /* no ino */
+
+	sz = xino_fread(br->br_xino_read, file, xino, sizeof(*xino), &pos);
+	if (sz == sizeof(*xino))
+		return 0; /* success */
+
+	err = sz;
+	if (unlikely(sz >= 0)) {
+		err = -EIO;
+		IOErr("xino read error (%ld)\n", (long)sz);
+	}
+
+	TraceErr(err);
+	return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+struct file *xino_create(struct super_block *sb, char *fname, int silent,
+			 struct dentry *parent)
+{
+	struct file *file;
+	int err;
+	struct dentry *hidden_parent;
+	struct inode *hidden_dir;
+	//const int udba = au_flag_test(sb, AuFlag_UDBA_INOTIFY);
+
+	LKTRTrace("%s\n", fname);
+	//DEBUG_ON(!au_flag_test(sb, AuFlag_XINO));
+
+	// LSM may detect it
+	// use sio?
+	file = vfsub_filp_open(fname, O_RDWR | O_CREAT | O_EXCL | O_LARGEFILE,
+			       S_IRUGO | S_IWUGO);
+	//file = ERR_PTR(-1);
+	if (IS_ERR(file)) {
+		if (!silent)
+			Err("open %s(%ld)\n", fname, PTR_ERR(file));
+		return file;
+	}
+#if 0
+	if (unlikely(udba && parent))
+		au_direval_dec(parent);
+#endif
+
+	/* keep file count */
+	hidden_parent = dget_parent(file->f_dentry);
+	hidden_dir = hidden_parent->d_inode;
+	hi_lock_parent(hidden_dir);
+	err = vfsub_unlink(hidden_dir, file->f_dentry, /*dlgt*/0);
+#if 0
+	if (unlikely(!err && udba && parent))
+		au_direval_dec(parent);
+#endif
+	i_unlock(hidden_dir);
+	dput(hidden_parent);
+	if (unlikely(err)) {
+		if (!silent)
+			Err("unlink %s(%d)\n", fname, err);
+		goto out;
+	}
+	if (sb != file->f_dentry->d_sb)
+		return file; /* success */
+
+	if (!silent)
+		Err("%s must be outside\n", fname);
+	err = -EINVAL;
+
+ out:
+	fput(file);
+	file = ERR_PTR(err);
+	return file;
+}
+
+/*
+ * find another branch who is on the same filesystem of the specified
+ * branch{@btgt}. search until @bend.
+ */
+static int is_sb_shared(struct super_block *sb, aufs_bindex_t btgt,
+			aufs_bindex_t bend)
+{
+	aufs_bindex_t bindex;
+	struct super_block *tgt_sb = sbr_sb(sb, btgt);
+
+	for (bindex = 0; bindex <= bend; bindex++)
+		if (unlikely(btgt != bindex && tgt_sb == sbr_sb(sb, bindex)))
+			return bindex;
+	return -1;
+}
+
+/*
+ * create a new xinofile at the same place/path as @base_file.
+ */
+static struct file *xino_create2(struct file *base_file)
+{
+	struct file *file;
+	int err;
+	struct dentry *base, *dentry, *parent;
+	struct inode *dir;
+	struct qstr *name;
+	struct lkup_args lkup = {
+		.nfsmnt	= NULL,
+		.dlgt	= 0
+	};
+
+	base = base_file->f_dentry;
+	LKTRTrace("%.*s\n", DLNPair(base));
+	parent = dget_parent(base);
+	dir = parent->d_inode;
+	IMustLock(dir);
+
+	file = ERR_PTR(-EINVAL);
+	if (unlikely(au_is_nfs(parent->d_sb)))
+		goto out;
+
+	// do not superio, nor NFS.
+	name = &base->d_name;
+	dentry = lkup_one(name->name, parent, name->len, &lkup);
+	//if (LktrCond) {dput(dentry); dentry = ERR_PTR(-1);}
+	if (IS_ERR(dentry)) {
+		file = (void*)dentry;
+		Err("%.*s lookup err %ld\n", LNPair(name), PTR_ERR(dentry));
+		goto out;
+	}
+	err = vfsub_create(dir, dentry, S_IRUGO | S_IWUGO, NULL, /*dlgt*/0);
+	//if (LktrCond) {vfs_unlink(dir, dentry); err = -1;}
+	if (unlikely(err)) {
+		file = ERR_PTR(err);
+		Err("%.*s create err %d\n", LNPair(name), err);
+		goto out_dput;
+	}
+	file = dentry_open(dget(dentry), mntget(base_file->f_vfsmnt),
+			   O_RDWR | O_CREAT | O_EXCL | O_LARGEFILE);
+	//if (LktrCond) {fput(file); file = ERR_PTR(-1);}
+	if (IS_ERR(file)) {
+		Err("%.*s open err %ld\n", LNPair(name), PTR_ERR(file));
+		goto out_dput;
+	}
+	err = vfsub_unlink(dir, dentry, /*dlgt*/0);
+	//if (LktrCond) err = -1;
+	if (!err)
+		goto out_dput; /* success */
+
+	Err("%.*s unlink err %d\n", LNPair(name), err);
+	fput(file);
+	file = ERR_PTR(err);
+
+ out_dput:
+	dput(dentry);
+ out:
+	dput(parent);
+	TraceErrPtr(file);
+	return file;
+}
+
+/*
+ * initialize the xinofile for the specified branch{@sb, @bindex}
+ * at the place/path where @base_file indicates.
+ * test whether another branch is on the same filesystem or not,
+ * if @do_test is true.
+ */
+int xino_init(struct super_block *sb, aufs_bindex_t bindex,
+	      struct file *base_file, int do_test)
+{
+	int err;
+	struct aufs_branch *br;
+	aufs_bindex_t bshared, bend;
+	struct file *file;
+	struct inode *inode, *hidden_inode;
+	struct xino xino;
+
+	LKTRTrace("b%d, base_file %p, do_test %d\n",
+		  bindex, base_file, do_test);
+	SiMustWriteLock(sb);
+	DEBUG_ON(!au_flag_test(sb, AuFlag_XINO));
+	br = stobr(sb, bindex);
+	DEBUG_ON(br->br_xino);
+
+	file = NULL;
+	bshared = -1;
+	bend = sbend(sb);
+	if (do_test)
+		bshared = is_sb_shared(sb, bindex, bend);
+	if (unlikely(bshared >= 0)) {
+		struct aufs_branch *shared_br = stobr(sb, bshared);
+		if (shared_br->br_xino) {
+			file = shared_br->br_xino;
+			get_file(file);
+		}
+	}
+
+	if (!file) {
+		struct dentry *parent = dget_parent(base_file->f_dentry);
+		struct inode *dir = parent->d_inode;
+
+		hi_lock_parent(dir);
+		file = xino_create2(base_file);
+		//if (LktrCond) {fput(file); file = ERR_PTR(-1);}
+		i_unlock(dir);
+		dput(parent);
+		err = PTR_ERR(file);
+		if (IS_ERR(file))
+			goto out;
+	}
+	br->br_xino_read = find_readf(file);
+	err = PTR_ERR(br->br_xino_read);
+	if (IS_ERR(br->br_xino_read))
+		goto out_put;
+	br->br_xino_write = find_writef(file);
+	err = PTR_ERR(br->br_xino_write);
+	if (IS_ERR(br->br_xino_write))
+		goto out_put;
+	br->br_xino = file;
+
+	inode = sb->s_root->d_inode;
+	hidden_inode = au_h_iptr_i(inode, bindex);
+	xino.ino = inode->i_ino;
+	//xino.h_gen = hidden_inode->i_generation;
+	//WARN_ON(xino.h_gen == AuXino_INVALID_HGEN);
+	err = xino_write(sb, bindex, hidden_inode->i_ino, &xino);
+	//if (LktrCond) err = -1;
+	if (!err)
+		return 0; /* success */
+
+	br->br_xino = NULL;
+
+ out_put:
+	fput(file);
+ out:
+	TraceErr(err);
+	return err;
+}
+
+/*
+ * set xino mount option.
+ */
+int xino_set(struct super_block *sb, struct opt_xino *xino, int remount)
+{
+	int err, sparse;
+	aufs_bindex_t bindex, bend;
+	struct aufs_branch *br;
+	struct dentry *parent;
+	struct qstr *name;
+	struct file *cur_xino;
+	struct inode *dir;
+
+	LKTRTrace("%s\n", xino->path);
+
+	err = 0;
+	name = &xino->file->f_dentry->d_name;
+	parent = dget_parent(xino->file->f_dentry);
+	dir = parent->d_inode;
+	cur_xino = stobr(sb, 0)->br_xino;
+	if (remount
+	    && cur_xino
+	    && cur_xino->f_dentry->d_parent == parent
+	    && name->len == cur_xino->f_dentry->d_name.len
+	    && !memcmp(name->name, cur_xino->f_dentry->d_name.name, name->len))
+		goto out;
+
+	au_flag_set(sb, AuFlag_XINO);
+	bend = sbend(sb);
+	for (bindex = bend; bindex >= 0; bindex--) {
+		br = stobr(sb, bindex);
+		if (unlikely(br->br_xino && file_count(br->br_xino) > 1)) {
+			fput(br->br_xino);
+			br->br_xino = NULL;
+		}
+	}
+
+	for (bindex = 0; bindex <= bend; bindex++) {
+		struct file *file;
+		struct inode *inode;
+
+		br = stobr(sb, bindex);
+		if (unlikely(!br->br_xino))
+			continue;
+
+		DEBUG_ON(file_count(br->br_xino) != 1);
+		hi_lock_parent(dir);
+		file = xino_create2(xino->file);
+		//if (LktrCond) {fput(file); file = ERR_PTR(-1);}
+		err = PTR_ERR(file);
+		if (IS_ERR(file)) {
+			i_unlock(dir);
+			break;
+		}
+		inode = br->br_xino->f_dentry->d_inode;
+		err = au_copy_file(file, br->br_xino, i_size_read(inode), sb,
+				   &sparse);
+		//if (LktrCond) err = -1;
+		i_unlock(dir);
+		if (unlikely(err)) {
+			fput(file);
+			break;
+		}
+		fput(br->br_xino);
+		br->br_xino = file;
+		br->br_xino_read = find_readf(file);
+		DEBUG_ON(IS_ERR(br->br_xino_read));
+		br->br_xino_write = find_writef(file);
+		DEBUG_ON(IS_ERR(br->br_xino_write));
+	}
+
+	for (bindex = 0; bindex <= bend; bindex++)
+		if (unlikely(!stobr(sb, bindex)->br_xino)) {
+			err = xino_init(sb, bindex, xino->file, /*do_test*/1);
+			//if (LktrCond) {fput(stobr(sb, bindex)->br_xino);
+			//stobr(sb, bindex)->br_xino = NULL; err = -1;}
+			if (!err)
+				continue;
+			IOErr("creating xino for branch %d(%d), "
+			      "forcing noxino\n", bindex, err);
+			err = -EIO;
+			break;
+		}
+ out:
+	dput(parent);
+	if (!err)
+		au_flag_set(sb, AuFlag_XINO);
+	else
+		au_flag_clr(sb, AuFlag_XINO);
+	TraceErr(err);
+	return err;
+}
+
+/*
+ * clear xino mount option
+ */
+int xino_clr(struct super_block *sb)
+{
+	aufs_bindex_t bindex, bend;
+
+	TraceEnter();
+	SiMustWriteLock(sb);
+
+	bend = sbend(sb);
+	for (bindex = 0; bindex <= bend; bindex++) {
+		struct aufs_branch *br;
+		br = stobr(sb, bindex);
+		if (br->br_xino) {
+			fput(br->br_xino);
+			br->br_xino = NULL;
+		}
+	}
+
+	//todo: need to make iunique() to return the larger inode number
+
+	au_flag_clr(sb, AuFlag_XINO);
+	return 0;
+}
+
+/*
+ * create a xinofile at the default place/path.
+ */
+struct file *xino_def(struct super_block *sb)
+{
+	struct file *file;
+	aufs_bindex_t bend, bindex, bwr;
+	char *page, *p;
+
+	bend = sbend(sb);
+	bwr = -1;
+	for (bindex = 0; bindex <= bend; bindex++)
+		if (br_writable(sbr_perm(sb, bindex))
+		    && !au_is_nfs(au_h_dptr_i(sb->s_root, bindex)->d_sb)) {
+			bwr = bindex;
+			break;
+		}
+
+	if (bwr != -1) {
+		// todo: rewrite with lkup_one()
+		file = ERR_PTR(-ENOMEM);
+		page = __getname();
+		//if (LktrCond) {__putname(page); page = NULL;}
+		if (unlikely(!page))
+			goto out;
+		p = d_path(au_h_dptr_i(sb->s_root, bwr), sbr_mnt(sb, bwr), page,
+			   PATH_MAX - sizeof(AUFS_XINO_FNAME));
+		//if (LktrCond) p = ERR_PTR(-1);
+		file = (void*)p;
+		if (p && !IS_ERR(p)) {
+			strcat(p, "/" AUFS_XINO_FNAME);
+			LKTRTrace("%s\n", p);
+			file = xino_create(sb, p, /*silent*/0, sb->s_root);
+			//if (LktrCond) {fput(file); file = ERR_PTR(-1);}
+		}
+		__putname(page);
+	} else {
+		file = xino_create(sb, AUFS_XINO_DEFPATH, /*silent*/0,
+				   /*parent*/NULL);
+		//if (LktrCond) {fput(file); file = ERR_PTR(-1);}
+	}
+
+ out:
+	TraceErrPtr(file);
+	return file;
+}
diff --git a/fs/squashfs/Makefile b/fs/squashfs/Makefile
new file mode 100644
index 0000000..1bc7b06
--- /dev/null
+++ b/fs/squashfs/Makefile
@@ -0,0 +1,7 @@
+#
+# Makefile for the linux squashfs routines.
+#
+
+obj-$(CONFIG_SQUASHFS) += squashfs.o
+squashfs-y += inode.o
+squashfs-y += squashfs2_0.o
diff --git a/fs/squashfs/inode.c b/fs/squashfs/inode.c
new file mode 100644
index 0000000..895b699
--- /dev/null
+++ b/fs/squashfs/inode.c
@@ -0,0 +1,2329 @@
+/*
+ * Squashfs - a compressed read only filesystem for Linux
+ *
+ * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007
+ * Phillip Lougher <phillip@lougher.org.uk>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2,
+ * or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ * inode.c
+ */
+
+#include <linux/squashfs_fs.h>
+#include <linux/module.h>
+#include <linux/zlib.h>
+#include <linux/fs.h>
+#include <linux/squashfs_fs_sb.h>
+#include <linux/squashfs_fs_i.h>
+#include <linux/buffer_head.h>
+#include <linux/vfs.h>
+#include <linux/vmalloc.h>
+#include <linux/smp_lock.h>
+
+#include "squashfs.h"
+
+static void vfs_read_inode(struct inode *i);
+static struct dentry *squashfs_get_parent(struct dentry *child);
+static int squashfs_read_inode(struct inode *i, squashfs_inode_t inode);
+static int squashfs_statfs(struct dentry *, struct kstatfs *);
+static int squashfs_symlink_readpage(struct file *file, struct page *page);
+static long long read_blocklist(struct inode *inode, int index,
+				int readahead_blks, char *block_list,
+				unsigned short **block_p, unsigned int *bsize);
+static int squashfs_readpage(struct file *file, struct page *page);
+static int squashfs_readpage4K(struct file *file, struct page *page);
+static int squashfs_readdir(struct file *, void *, filldir_t);
+static struct dentry *squashfs_lookup(struct inode *, struct dentry *,
+				struct nameidata *);
+static int squashfs_remount(struct super_block *s, int *flags, char *data);
+static void squashfs_put_super(struct super_block *);
+static int squashfs_get_sb(struct file_system_type *,int, const char *, void *,
+				struct vfsmount *);
+static struct inode *squashfs_alloc_inode(struct super_block *sb);
+static void squashfs_destroy_inode(struct inode *inode);
+static int init_inodecache(void);
+static void destroy_inodecache(void);
+
+static struct file_system_type squashfs_fs_type = {
+	.owner = THIS_MODULE,
+	.name = "squashfs",
+	.get_sb = squashfs_get_sb,
+	.kill_sb = kill_block_super,
+	.fs_flags = FS_REQUIRES_DEV
+};
+
+static const unsigned char squashfs_filetype_table[] = {
+	DT_UNKNOWN, DT_DIR, DT_REG, DT_LNK, DT_BLK, DT_CHR, DT_FIFO, DT_SOCK
+};
+
+static struct super_operations squashfs_super_ops = {
+	.alloc_inode = squashfs_alloc_inode,
+	.destroy_inode = squashfs_destroy_inode,
+	.statfs = squashfs_statfs,
+	.put_super = squashfs_put_super,
+	.remount_fs = squashfs_remount
+};
+
+static struct super_operations squashfs_export_super_ops = {
+	.alloc_inode = squashfs_alloc_inode,
+	.destroy_inode = squashfs_destroy_inode,
+	.statfs = squashfs_statfs,
+	.put_super = squashfs_put_super,
+	.read_inode = vfs_read_inode
+};
+
+static struct export_operations squashfs_export_ops = {
+	.get_parent = squashfs_get_parent
+};
+
+SQSH_EXTERN const struct address_space_operations squashfs_symlink_aops = {
+	.readpage = squashfs_symlink_readpage
+};
+
+SQSH_EXTERN const struct address_space_operations squashfs_aops = {
+	.readpage = squashfs_readpage
+};
+
+SQSH_EXTERN const struct address_space_operations squashfs_aops_4K = {
+	.readpage = squashfs_readpage4K
+};
+
+static const struct file_operations squashfs_dir_ops = {
+	.read = generic_read_dir,
+	.readdir = squashfs_readdir
+};
+
+SQSH_EXTERN struct inode_operations squashfs_dir_inode_ops = {
+	.lookup = squashfs_lookup
+};
+
+
+static struct buffer_head *get_block_length(struct super_block *s,
+				int *cur_index, int *offset, int *c_byte)
+{
+	struct squashfs_sb_info *msblk = s->s_fs_info;
+	unsigned short temp;
+	struct buffer_head *bh;
+
+	if (!(bh = sb_bread(s, *cur_index)))
+		goto out;
+
+	if (msblk->devblksize - *offset == 1) {
+		if (msblk->swap)
+			((unsigned char *) &temp)[1] = *((unsigned char *)
+				(bh->b_data + *offset));
+		else
+			((unsigned char *) &temp)[0] = *((unsigned char *)
+				(bh->b_data + *offset));
+		brelse(bh);
+		if (!(bh = sb_bread(s, ++(*cur_index))))
+			goto out;
+		if (msblk->swap)
+			((unsigned char *) &temp)[0] = *((unsigned char *)
+				bh->b_data); 
+		else
+			((unsigned char *) &temp)[1] = *((unsigned char *)
+				bh->b_data); 
+		*c_byte = temp;
+		*offset = 1;
+	} else {
+		if (msblk->swap) {
+			((unsigned char *) &temp)[1] = *((unsigned char *)
+				(bh->b_data + *offset));
+			((unsigned char *) &temp)[0] = *((unsigned char *)
+				(bh->b_data + *offset + 1)); 
+		} else {
+			((unsigned char *) &temp)[0] = *((unsigned char *)
+				(bh->b_data + *offset));
+			((unsigned char *) &temp)[1] = *((unsigned char *)
+				(bh->b_data + *offset + 1)); 
+		}
+		*c_byte = temp;
+		*offset += 2;
+	}
+
+	if (SQUASHFS_CHECK_DATA(msblk->sblk.flags)) {
+		if (*offset == msblk->devblksize) {
+			brelse(bh);
+			if (!(bh = sb_bread(s, ++(*cur_index))))
+				goto out;
+			*offset = 0;
+		}
+		if (*((unsigned char *) (bh->b_data + *offset)) !=
+						SQUASHFS_MARKER_BYTE) {
+			ERROR("Metadata block marker corrupt @ %x\n",
+						*cur_index);
+			brelse(bh);
+			goto out;
+		}
+		(*offset)++;
+	}
+	return bh;
+
+out:
+	return NULL;
+}
+
+
+SQSH_EXTERN unsigned int squashfs_read_data(struct super_block *s, char *buffer,
+			long long index, unsigned int length,
+			long long *next_index, int srclength)
+{
+	struct squashfs_sb_info *msblk = s->s_fs_info;
+	struct squashfs_super_block *sblk = &msblk->sblk;
+	struct buffer_head *bh[((SQUASHFS_FILE_MAX_SIZE - 1) >>
+			msblk->devblksize_log2) + 2];
+	unsigned int offset = index & ((1 << msblk->devblksize_log2) - 1);
+	unsigned int cur_index = index >> msblk->devblksize_log2;
+	int bytes, avail_bytes, b = 0, k = 0;
+	unsigned int compressed;
+	unsigned int c_byte = length;
+
+	if (c_byte) {
+		bytes = msblk->devblksize - offset;
+		compressed = SQUASHFS_COMPRESSED_BLOCK(c_byte);
+		c_byte = SQUASHFS_COMPRESSED_SIZE_BLOCK(c_byte);
+
+		TRACE("Block @ 0x%llx, %scompressed size %d, src size %d\n", index, compressed
+					? "" : "un", (unsigned int) c_byte, srclength);
+
+		if (c_byte > srclength || index < 0 || (index + c_byte) > sblk->bytes_used)
+			goto read_failure;
+
+		if (!(bh[0] = sb_getblk(s, cur_index)))
+			goto block_release;
+
+		for (b = 1; bytes < c_byte; b++) {
+			if (!(bh[b] = sb_getblk(s, ++cur_index)))
+				goto block_release;
+			bytes += msblk->devblksize;
+		}
+		ll_rw_block(READ, b, bh);
+	} else {
+		if (index < 0 || (index + 2) > sblk->bytes_used)
+			goto read_failure;
+
+		if (!(bh[0] = get_block_length(s, &cur_index, &offset,
+								&c_byte)))
+			goto read_failure;
+
+		bytes = msblk->devblksize - offset;
+		compressed = SQUASHFS_COMPRESSED(c_byte);
+		c_byte = SQUASHFS_COMPRESSED_SIZE(c_byte);
+
+		TRACE("Block @ 0x%llx, %scompressed size %d\n", index, compressed
+					? "" : "un", (unsigned int) c_byte);
+
+		if (c_byte > srclength || (index + c_byte) > sblk->bytes_used)
+			goto read_failure;
+
+		for (b = 1; bytes < c_byte; b++) {
+			if (!(bh[b] = sb_getblk(s, ++cur_index)))
+				goto block_release;
+			bytes += msblk->devblksize;
+		}
+		ll_rw_block(READ, b - 1, bh + 1);
+	}
+
+	if (compressed) {
+		int zlib_err = 0;
+
+		/*
+	 	* uncompress block
+	 	*/
+
+		mutex_lock(&msblk->read_data_mutex);
+
+		msblk->stream.next_out = buffer;
+		msblk->stream.avail_out = srclength;
+
+		for (bytes = 0; k < b; k++) {
+			avail_bytes = (c_byte - bytes) > (msblk->devblksize - offset) ?
+					msblk->devblksize - offset :
+					c_byte - bytes;
+			wait_on_buffer(bh[k]);
+			if (!buffer_uptodate(bh[k]))
+				goto release_mutex;
+
+			msblk->stream.next_in = bh[k]->b_data + offset;
+			msblk->stream.avail_in = avail_bytes;
+
+			if (k == 0) {
+				zlib_err = zlib_inflateInit(&msblk->stream);
+				if (zlib_err != Z_OK) {
+					ERROR("zlib_inflateInit returned unexpected result 0x%x, srclength %d\n",
+						zlib_err, srclength);
+					goto release_mutex;
+				}
+
+				if (avail_bytes == 0) {
+					offset = 0;
+					brelse(bh[k]);
+					continue;
+				}
+			}
+
+			zlib_err = zlib_inflate(&msblk->stream, Z_NO_FLUSH);
+			if (zlib_err != Z_OK && zlib_err != Z_STREAM_END) {
+				ERROR("zlib_inflate returned unexpected result 0x%x, srclength %d, avail_in %d, avail_out %d\n",
+					zlib_err, srclength, msblk->stream.avail_in, msblk->stream.avail_out);
+				goto release_mutex;
+			}
+
+			bytes += avail_bytes;
+			offset = 0;
+			brelse(bh[k]);
+		}
+
+		if (zlib_err != Z_STREAM_END)
+			goto release_mutex;
+
+		zlib_err = zlib_inflateEnd(&msblk->stream);
+		if (zlib_err != Z_OK) {
+			ERROR("zlib_inflateEnd returned unexpected result 0x%x, srclength %d\n",
+				zlib_err, srclength);
+			goto release_mutex;
+		}
+		bytes = msblk->stream.total_out;
+		mutex_unlock(&msblk->read_data_mutex);
+	} else {
+		int i;
+
+		for(i = 0; i < b; i++) {
+			wait_on_buffer(bh[i]);
+			if(!buffer_uptodate(bh[i]))
+				goto block_release;
+		}
+
+		for (bytes = 0; k < b; k++) {
+			avail_bytes = (c_byte - bytes) > (msblk->devblksize - offset) ?
+					msblk->devblksize - offset :
+					c_byte - bytes;
+			memcpy(buffer + bytes, bh[k]->b_data + offset, avail_bytes);
+			bytes += avail_bytes;
+			offset = 0;
+			brelse(bh[k]);
+		}
+	}
+
+	if (next_index)
+		*next_index = index + c_byte + (length ? 0 :
+				(SQUASHFS_CHECK_DATA(msblk->sblk.flags)
+				 ? 3 : 2));
+	return bytes;
+
+release_mutex:
+	mutex_unlock(&msblk->read_data_mutex);
+
+block_release:
+	for (; k < b; k++)
+		brelse(bh[k]);
+
+read_failure:
+	ERROR("sb_bread failed reading block 0x%x\n", cur_index);
+	return 0;
+}
+
+
+SQSH_EXTERN int squashfs_get_cached_block(struct super_block *s, char *buffer,
+				long long block, unsigned int offset,
+				int length, long long *next_block,
+				unsigned int *next_offset)
+{
+	struct squashfs_sb_info *msblk = s->s_fs_info;
+	int n, i, bytes, return_length = length;
+	long long next_index;
+
+	TRACE("Entered squashfs_get_cached_block [%llx:%x]\n", block, offset);
+
+	while ( 1 ) {
+		for (i = 0; i < SQUASHFS_CACHED_BLKS; i++) 
+			if (msblk->block_cache[i].block == block)
+				break; 
+		
+		mutex_lock(&msblk->block_cache_mutex);
+
+		if (i == SQUASHFS_CACHED_BLKS) {
+			/* read inode header block */
+			for (i = msblk->next_cache, n = SQUASHFS_CACHED_BLKS;
+					n ; n --, i = (i + 1) %
+					SQUASHFS_CACHED_BLKS)
+				if (msblk->block_cache[i].block !=
+							SQUASHFS_USED_BLK)
+					break;
+
+			if (n == 0) {
+				wait_queue_t wait;
+
+				init_waitqueue_entry(&wait, current);
+				add_wait_queue(&msblk->waitq, &wait);
+				set_current_state(TASK_UNINTERRUPTIBLE);
+ 				mutex_unlock(&msblk->block_cache_mutex);
+				schedule();
+				set_current_state(TASK_RUNNING);
+				remove_wait_queue(&msblk->waitq, &wait);
+				continue;
+			}
+			msblk->next_cache = (i + 1) % SQUASHFS_CACHED_BLKS;
+
+			if (msblk->block_cache[i].block ==
+							SQUASHFS_INVALID_BLK) {
+				if (!(msblk->block_cache[i].data =
+						kmalloc(SQUASHFS_METADATA_SIZE,
+						GFP_KERNEL))) {
+					ERROR("Failed to allocate cache"
+							"block\n");
+					mutex_unlock(&msblk->block_cache_mutex);
+					goto out;
+				}
+			}
+	
+			msblk->block_cache[i].block = SQUASHFS_USED_BLK;
+			mutex_unlock(&msblk->block_cache_mutex);
+
+			msblk->block_cache[i].length = squashfs_read_data(s,
+				msblk->block_cache[i].data, block, 0, &next_index, SQUASHFS_METADATA_SIZE);
+			if (msblk->block_cache[i].length == 0) {
+				ERROR("Unable to read cache block [%llx:%x]\n",
+						block, offset);
+				mutex_lock(&msblk->block_cache_mutex);
+				msblk->block_cache[i].block = SQUASHFS_INVALID_BLK;
+				kfree(msblk->block_cache[i].data);
+				wake_up(&msblk->waitq);
+				mutex_unlock(&msblk->block_cache_mutex);
+				goto out;
+			}
+
+			mutex_lock(&msblk->block_cache_mutex);
+			wake_up(&msblk->waitq);
+			msblk->block_cache[i].block = block;
+			msblk->block_cache[i].next_index = next_index;
+			TRACE("Read cache block [%llx:%x]\n", block, offset);
+		}
+
+		if (msblk->block_cache[i].block != block) {
+			mutex_unlock(&msblk->block_cache_mutex);
+			continue;
+		}
+
+		bytes = msblk->block_cache[i].length - offset;
+
+		if (bytes < 1) {
+			mutex_unlock(&msblk->block_cache_mutex);
+			goto out;
+		} else if (bytes >= length) {
+			if (buffer)
+				memcpy(buffer, msblk->block_cache[i].data +
+						offset, length);
+			if (msblk->block_cache[i].length - offset == length) {
+				*next_block = msblk->block_cache[i].next_index;
+				*next_offset = 0;
+			} else {
+				*next_block = block;
+				*next_offset = offset + length;
+			}
+			mutex_unlock(&msblk->block_cache_mutex);
+			goto finish;
+		} else {
+			if (buffer) {
+				memcpy(buffer, msblk->block_cache[i].data +
+						offset, bytes);
+				buffer += bytes;
+			}
+			block = msblk->block_cache[i].next_index;
+			mutex_unlock(&msblk->block_cache_mutex);
+			length -= bytes;
+			offset = 0;
+		}
+	}
+
+finish:
+	return return_length;
+out:
+	return 0;
+}
+
+
+static int get_fragment_location(struct super_block *s, unsigned int fragment,
+				long long *fragment_start_block,
+				unsigned int *fragment_size)
+{
+	struct squashfs_sb_info *msblk = s->s_fs_info;
+	long long start_block =
+		msblk->fragment_index[SQUASHFS_FRAGMENT_INDEX(fragment)];
+	int offset = SQUASHFS_FRAGMENT_INDEX_OFFSET(fragment);
+	struct squashfs_fragment_entry fragment_entry;
+
+	if (msblk->swap) {
+		struct squashfs_fragment_entry sfragment_entry;
+
+		if (!squashfs_get_cached_block(s, (char *) &sfragment_entry,
+					start_block, offset,
+					sizeof(sfragment_entry), &start_block,
+					&offset))
+			goto out;
+		SQUASHFS_SWAP_FRAGMENT_ENTRY(&fragment_entry, &sfragment_entry);
+	} else
+		if (!squashfs_get_cached_block(s, (char *) &fragment_entry,
+					start_block, offset,
+					sizeof(fragment_entry), &start_block,
+					&offset))
+			goto out;
+
+	*fragment_start_block = fragment_entry.start_block;
+	*fragment_size = fragment_entry.size;
+
+	return 1;
+
+out:
+	return 0;
+}
+
+
+SQSH_EXTERN void release_cached_fragment(struct squashfs_sb_info *msblk, struct
+					squashfs_fragment_cache *fragment)
+{
+	mutex_lock(&msblk->fragment_mutex);
+	fragment->locked --;
+	wake_up(&msblk->fragment_wait_queue);
+	mutex_unlock(&msblk->fragment_mutex);
+}
+
+
+SQSH_EXTERN struct squashfs_fragment_cache *get_cached_fragment(struct super_block
+					*s, long long start_block,
+					int length)
+{
+	int i, n;
+	struct squashfs_sb_info *msblk = s->s_fs_info;
+	struct squashfs_super_block *sblk = &msblk->sblk;
+
+	while ( 1 ) {
+		mutex_lock(&msblk->fragment_mutex);
+
+		for (i = 0; i < SQUASHFS_CACHED_FRAGMENTS &&
+				msblk->fragment[i].block != start_block; i++);
+
+		if (i == SQUASHFS_CACHED_FRAGMENTS) {
+			for (i = msblk->next_fragment, n =
+				SQUASHFS_CACHED_FRAGMENTS; n &&
+				msblk->fragment[i].locked; n--, i = (i + 1) %
+				SQUASHFS_CACHED_FRAGMENTS);
+
+			if (n == 0) {
+				wait_queue_t wait;
+
+				init_waitqueue_entry(&wait, current);
+				add_wait_queue(&msblk->fragment_wait_queue,
+									&wait);
+				set_current_state(TASK_UNINTERRUPTIBLE);
+				mutex_unlock(&msblk->fragment_mutex);
+				schedule();
+				set_current_state(TASK_RUNNING);
+				remove_wait_queue(&msblk->fragment_wait_queue,
+									&wait);
+				continue;
+			}
+			msblk->next_fragment = (msblk->next_fragment + 1) %
+				SQUASHFS_CACHED_FRAGMENTS;
+			
+			if (msblk->fragment[i].data == NULL)
+				if (!(msblk->fragment[i].data = SQUASHFS_ALLOC
+						(SQUASHFS_FILE_MAX_SIZE))) {
+					ERROR("Failed to allocate fragment "
+							"cache block\n");
+					mutex_unlock(&msblk->fragment_mutex);
+					goto out;
+				}
+
+			msblk->fragment[i].block = SQUASHFS_INVALID_BLK;
+			msblk->fragment[i].locked = 1;
+			mutex_unlock(&msblk->fragment_mutex);
+
+			if (!(msblk->fragment[i].length = squashfs_read_data(s,
+						msblk->fragment[i].data,
+						start_block, length, NULL, sblk->block_size))) {
+				ERROR("Unable to read fragment cache block "
+							"[%llx]\n", start_block);
+				msblk->fragment[i].locked = 0;
+				smp_mb();
+				goto out;
+			}
+
+			mutex_lock(&msblk->fragment_mutex);
+			msblk->fragment[i].block = start_block;
+			TRACE("New fragment %d, start block %lld, locked %d\n",
+						i, msblk->fragment[i].block,
+						msblk->fragment[i].locked);
+			mutex_unlock(&msblk->fragment_mutex);
+			break;
+		}
+
+		msblk->fragment[i].locked++;
+		mutex_unlock(&msblk->fragment_mutex);
+		TRACE("Got fragment %d, start block %lld, locked %d\n", i,
+						msblk->fragment[i].block,
+						msblk->fragment[i].locked);
+		break;
+	}
+
+	return &msblk->fragment[i];
+
+out:
+	return NULL;
+}
+
+
+static void squashfs_new_inode(struct squashfs_sb_info *msblk, struct inode *i,
+		struct squashfs_base_inode_header *inodeb)
+{
+	i->i_ino = inodeb->inode_number;
+	i->i_mtime.tv_sec = inodeb->mtime;
+	i->i_atime.tv_sec = inodeb->mtime;
+	i->i_ctime.tv_sec = inodeb->mtime;
+	i->i_uid = msblk->uid[inodeb->uid];
+	i->i_mode = inodeb->mode;
+	i->i_size = 0;
+	if (inodeb->guid == SQUASHFS_GUIDS)
+		i->i_gid = i->i_uid;
+	else
+		i->i_gid = msblk->guid[inodeb->guid];
+}
+
+
+static squashfs_inode_t squashfs_inode_lookup(struct super_block *s, int ino)
+{
+	struct squashfs_sb_info *msblk = s->s_fs_info;
+	long long start = msblk->inode_lookup_table[SQUASHFS_LOOKUP_BLOCK(ino - 1)];
+	int offset = SQUASHFS_LOOKUP_BLOCK_OFFSET(ino - 1);
+	squashfs_inode_t inode;
+
+	TRACE("Entered squashfs_inode_lookup, inode_number = %d\n", ino);
+
+	if (msblk->swap) {
+		squashfs_inode_t sinode;
+
+		if (!squashfs_get_cached_block(s, (char *) &sinode, start, offset,
+					sizeof(sinode), &start, &offset))
+			goto out;
+		SQUASHFS_SWAP_INODE_T((&inode), &sinode);
+	} else if (!squashfs_get_cached_block(s, (char *) &inode, start, offset,
+					sizeof(inode), &start, &offset))
+			goto out;
+
+	TRACE("squashfs_inode_lookup, inode = 0x%llx\n", inode);
+
+	return inode;
+
+out:
+	return SQUASHFS_INVALID_BLK;
+}
+	
+
+static void vfs_read_inode(struct inode *i)
+{
+	struct squashfs_sb_info *msblk = i->i_sb->s_fs_info;
+	squashfs_inode_t inode = squashfs_inode_lookup(i->i_sb, i->i_ino);
+
+	TRACE("Entered vfs_read_inode\n");
+
+	if(inode != SQUASHFS_INVALID_BLK)
+		(msblk->read_inode)(i, inode);
+}
+
+
+static struct dentry *squashfs_get_parent(struct dentry *child)
+{
+	struct inode *i = child->d_inode;
+	struct inode *parent = iget(i->i_sb, SQUASHFS_I(i)->u.s2.parent_inode);
+	struct dentry *rv;
+
+	TRACE("Entered squashfs_get_parent\n");
+
+	if(parent == NULL) {
+		rv = ERR_PTR(-EACCES);
+		goto out;
+	}
+
+	rv = d_alloc_anon(parent);
+	if(rv == NULL)
+		rv = ERR_PTR(-ENOMEM);
+
+out:
+	return rv;
+}
+
+	
+SQSH_EXTERN struct inode *squashfs_iget(struct super_block *s, squashfs_inode_t inode, unsigned int inode_number)
+{
+	struct squashfs_sb_info *msblk = s->s_fs_info;
+	struct inode *i = iget_locked(s, inode_number);
+
+	TRACE("Entered squashfs_iget\n");
+
+	if(i && (i->i_state & I_NEW)) {
+		(msblk->read_inode)(i, inode);
+		unlock_new_inode(i);
+	}
+
+	return i;
+}
+
+
+static int squashfs_read_inode(struct inode *i, squashfs_inode_t inode)
+{
+	struct super_block *s = i->i_sb;
+	struct squashfs_sb_info *msblk = s->s_fs_info;
+	struct squashfs_super_block *sblk = &msblk->sblk;
+	long long block = SQUASHFS_INODE_BLK(inode) +
+		sblk->inode_table_start;
+	unsigned int offset = SQUASHFS_INODE_OFFSET(inode);
+	long long next_block;
+	unsigned int next_offset;
+	union squashfs_inode_header id, sid;
+	struct squashfs_base_inode_header *inodeb = &id.base,
+					  *sinodeb = &sid.base;
+
+	TRACE("Entered squashfs_read_inode\n");
+
+	if (msblk->swap) {
+		if (!squashfs_get_cached_block(s, (char *) sinodeb, block,
+					offset, sizeof(*sinodeb), &next_block,
+					&next_offset))
+			goto failed_read;
+		SQUASHFS_SWAP_BASE_INODE_HEADER(inodeb, sinodeb,
+					sizeof(*sinodeb));
+	} else
+		if (!squashfs_get_cached_block(s, (char *) inodeb, block,
+					offset, sizeof(*inodeb), &next_block,
+					&next_offset))
+			goto failed_read;
+
+	squashfs_new_inode(msblk, i, inodeb);
+
+	switch(inodeb->inode_type) {
+		case SQUASHFS_FILE_TYPE: {
+			unsigned int frag_size;
+			long long frag_blk;
+			struct squashfs_reg_inode_header *inodep = &id.reg;
+			struct squashfs_reg_inode_header *sinodep = &sid.reg;
+				
+			if (msblk->swap) {
+				if (!squashfs_get_cached_block(s, (char *)
+						sinodep, block, offset,
+						sizeof(*sinodep), &next_block,
+						&next_offset))
+					goto failed_read;
+				SQUASHFS_SWAP_REG_INODE_HEADER(inodep, sinodep);
+			} else
+				if (!squashfs_get_cached_block(s, (char *)
+						inodep, block, offset,
+						sizeof(*inodep), &next_block,
+						&next_offset))
+					goto failed_read;
+
+			frag_blk = SQUASHFS_INVALID_BLK;
+			if (inodep->fragment != SQUASHFS_INVALID_FRAG &&
+					!get_fragment_location(s,
+					inodep->fragment, &frag_blk, &frag_size))
+				goto failed_read;
+				
+			i->i_nlink = 1;
+			i->i_size = inodep->file_size;
+			i->i_fop = &generic_ro_fops;
+			i->i_mode |= S_IFREG;
+			i->i_blocks = ((i->i_size - 1) >> 9) + 1;
+			SQUASHFS_I(i)->u.s1.fragment_start_block = frag_blk;
+			SQUASHFS_I(i)->u.s1.fragment_size = frag_size;
+			SQUASHFS_I(i)->u.s1.fragment_offset = inodep->offset;
+			SQUASHFS_I(i)->start_block = inodep->start_block;
+			SQUASHFS_I(i)->u.s1.block_list_start = next_block;
+			SQUASHFS_I(i)->offset = next_offset;
+			if (sblk->block_size > 4096)
+				i->i_data.a_ops = &squashfs_aops;
+			else
+				i->i_data.a_ops = &squashfs_aops_4K;
+
+			TRACE("File inode %x:%x, start_block %llx, "
+					"block_list_start %llx, offset %x\n",
+					SQUASHFS_INODE_BLK(inode), offset,
+					inodep->start_block, next_block,
+					next_offset);
+			break;
+		}
+		case SQUASHFS_LREG_TYPE: {
+			unsigned int frag_size;
+			long long frag_blk;
+			struct squashfs_lreg_inode_header *inodep = &id.lreg;
+			struct squashfs_lreg_inode_header *sinodep = &sid.lreg;
+				
+			if (msblk->swap) {
+				if (!squashfs_get_cached_block(s, (char *)
+						sinodep, block, offset,
+						sizeof(*sinodep), &next_block,
+						&next_offset))
+					goto failed_read;
+				SQUASHFS_SWAP_LREG_INODE_HEADER(inodep, sinodep);
+			} else
+				if (!squashfs_get_cached_block(s, (char *)
+						inodep, block, offset,
+						sizeof(*inodep), &next_block,
+						&next_offset))
+					goto failed_read;
+
+			frag_blk = SQUASHFS_INVALID_BLK;
+			if (inodep->fragment != SQUASHFS_INVALID_FRAG &&
+					!get_fragment_location(s,
+					inodep->fragment, &frag_blk, &frag_size))
+				goto failed_read;
+				
+			i->i_nlink = inodep->nlink;
+			i->i_size = inodep->file_size;
+			i->i_fop = &generic_ro_fops;
+			i->i_mode |= S_IFREG;
+			i->i_blocks = ((i->i_size - 1) >> 9) + 1;
+			SQUASHFS_I(i)->u.s1.fragment_start_block = frag_blk;
+			SQUASHFS_I(i)->u.s1.fragment_size = frag_size;
+			SQUASHFS_I(i)->u.s1.fragment_offset = inodep->offset;
+			SQUASHFS_I(i)->start_block = inodep->start_block;
+			SQUASHFS_I(i)->u.s1.block_list_start = next_block;
+			SQUASHFS_I(i)->offset = next_offset;
+			if (sblk->block_size > 4096)
+				i->i_data.a_ops = &squashfs_aops;
+			else
+				i->i_data.a_ops = &squashfs_aops_4K;
+
+			TRACE("File inode %x:%x, start_block %llx, "
+					"block_list_start %llx, offset %x\n",
+					SQUASHFS_INODE_BLK(inode), offset,
+					inodep->start_block, next_block,
+					next_offset);
+			break;
+		}
+		case SQUASHFS_DIR_TYPE: {
+			struct squashfs_dir_inode_header *inodep = &id.dir;
+			struct squashfs_dir_inode_header *sinodep = &sid.dir;
+
+			if (msblk->swap) {
+				if (!squashfs_get_cached_block(s, (char *)
+						sinodep, block, offset,
+						sizeof(*sinodep), &next_block,
+						&next_offset))
+					goto failed_read;
+				SQUASHFS_SWAP_DIR_INODE_HEADER(inodep, sinodep);
+			} else
+				if (!squashfs_get_cached_block(s, (char *)
+						inodep, block, offset,
+						sizeof(*inodep), &next_block,
+						&next_offset))
+					goto failed_read;
+
+			i->i_nlink = inodep->nlink;
+			i->i_size = inodep->file_size;
+			i->i_op = &squashfs_dir_inode_ops;
+			i->i_fop = &squashfs_dir_ops;
+			i->i_mode |= S_IFDIR;
+			SQUASHFS_I(i)->start_block = inodep->start_block;
+			SQUASHFS_I(i)->offset = inodep->offset;
+			SQUASHFS_I(i)->u.s2.directory_index_count = 0;
+			SQUASHFS_I(i)->u.s2.parent_inode = inodep->parent_inode;
+
+			TRACE("Directory inode %x:%x, start_block %x, offset "
+					"%x\n", SQUASHFS_INODE_BLK(inode),
+					offset, inodep->start_block,
+					inodep->offset);
+			break;
+		}
+		case SQUASHFS_LDIR_TYPE: {
+			struct squashfs_ldir_inode_header *inodep = &id.ldir;
+			struct squashfs_ldir_inode_header *sinodep = &sid.ldir;
+
+			if (msblk->swap) {
+				if (!squashfs_get_cached_block(s, (char *)
+						sinodep, block, offset,
+						sizeof(*sinodep), &next_block,
+						&next_offset))
+					goto failed_read;
+				SQUASHFS_SWAP_LDIR_INODE_HEADER(inodep,
+						sinodep);
+			} else
+				if (!squashfs_get_cached_block(s, (char *)
+						inodep, block, offset,
+						sizeof(*inodep), &next_block,
+						&next_offset))
+					goto failed_read;
+
+			i->i_nlink = inodep->nlink;
+			i->i_size = inodep->file_size;
+			i->i_op = &squashfs_dir_inode_ops;
+			i->i_fop = &squashfs_dir_ops;
+			i->i_mode |= S_IFDIR;
+			SQUASHFS_I(i)->start_block = inodep->start_block;
+			SQUASHFS_I(i)->offset = inodep->offset;
+			SQUASHFS_I(i)->u.s2.directory_index_start = next_block;
+			SQUASHFS_I(i)->u.s2.directory_index_offset =
+								next_offset;
+			SQUASHFS_I(i)->u.s2.directory_index_count =
+								inodep->i_count;
+			SQUASHFS_I(i)->u.s2.parent_inode = inodep->parent_inode;
+
+			TRACE("Long directory inode %x:%x, start_block %x, "
+					"offset %x\n",
+					SQUASHFS_INODE_BLK(inode), offset,
+					inodep->start_block, inodep->offset);
+			break;
+		}
+		case SQUASHFS_SYMLINK_TYPE: {
+			struct squashfs_symlink_inode_header *inodep =
+								&id.symlink;
+			struct squashfs_symlink_inode_header *sinodep =
+								&sid.symlink;
+	
+			if (msblk->swap) {
+				if (!squashfs_get_cached_block(s, (char *)
+						sinodep, block, offset,
+						sizeof(*sinodep), &next_block,
+						&next_offset))
+					goto failed_read;
+				SQUASHFS_SWAP_SYMLINK_INODE_HEADER(inodep,
+								sinodep);
+			} else
+				if (!squashfs_get_cached_block(s, (char *)
+						inodep, block, offset,
+						sizeof(*inodep), &next_block,
+						&next_offset))
+					goto failed_read;
+
+			i->i_nlink = inodep->nlink;
+			i->i_size = inodep->symlink_size;
+			i->i_op = &page_symlink_inode_operations;
+			i->i_data.a_ops = &squashfs_symlink_aops;
+			i->i_mode |= S_IFLNK;
+			SQUASHFS_I(i)->start_block = next_block;
+			SQUASHFS_I(i)->offset = next_offset;
+
+			TRACE("Symbolic link inode %x:%x, start_block %llx, "
+					"offset %x\n",
+					SQUASHFS_INODE_BLK(inode), offset,
+					next_block, next_offset);
+			break;
+		 }
+		 case SQUASHFS_BLKDEV_TYPE:
+		 case SQUASHFS_CHRDEV_TYPE: {
+			struct squashfs_dev_inode_header *inodep = &id.dev;
+			struct squashfs_dev_inode_header *sinodep = &sid.dev;
+
+			if (msblk->swap) {
+				if (!squashfs_get_cached_block(s, (char *)
+						sinodep, block, offset,
+						sizeof(*sinodep), &next_block,
+						&next_offset))
+					goto failed_read;
+				SQUASHFS_SWAP_DEV_INODE_HEADER(inodep, sinodep);
+			} else	
+				if (!squashfs_get_cached_block(s, (char *)
+						inodep, block, offset,
+						sizeof(*inodep), &next_block,
+						&next_offset))
+					goto failed_read;
+
+			i->i_nlink = inodep->nlink;
+			i->i_mode |= (inodeb->inode_type ==
+					SQUASHFS_CHRDEV_TYPE) ?  S_IFCHR :
+					S_IFBLK;
+			init_special_inode(i, i->i_mode,
+					old_decode_dev(inodep->rdev));
+
+			TRACE("Device inode %x:%x, rdev %x\n",
+					SQUASHFS_INODE_BLK(inode), offset,
+					inodep->rdev);
+			break;
+		 }
+		 case SQUASHFS_FIFO_TYPE:
+		 case SQUASHFS_SOCKET_TYPE: {
+			struct squashfs_ipc_inode_header *inodep = &id.ipc;
+			struct squashfs_ipc_inode_header *sinodep = &sid.ipc;
+
+			if (msblk->swap) {
+				if (!squashfs_get_cached_block(s, (char *)
+						sinodep, block, offset,
+						sizeof(*sinodep), &next_block,
+						&next_offset))
+					goto failed_read;
+				SQUASHFS_SWAP_IPC_INODE_HEADER(inodep, sinodep);
+			} else	
+				if (!squashfs_get_cached_block(s, (char *)
+						inodep, block, offset,
+						sizeof(*inodep), &next_block,
+						&next_offset))
+					goto failed_read;
+
+			i->i_nlink = inodep->nlink;
+			i->i_mode |= (inodeb->inode_type == SQUASHFS_FIFO_TYPE)
+							? S_IFIFO : S_IFSOCK;
+			init_special_inode(i, i->i_mode, 0);
+			break;
+		 }
+		 default:
+			ERROR("Unknown inode type %d in squashfs_iget!\n",
+					inodeb->inode_type);
+			goto failed_read1;
+	}
+	
+	return 1;
+
+failed_read:
+	ERROR("Unable to read inode [%llx:%x]\n", block, offset);
+
+failed_read1:
+	make_bad_inode(i);
+	return 0;
+}
+
+
+static int read_inode_lookup_table(struct super_block *s)
+{
+	struct squashfs_sb_info *msblk = s->s_fs_info;
+	struct squashfs_super_block *sblk = &msblk->sblk;
+	unsigned int length = SQUASHFS_LOOKUP_BLOCK_BYTES(sblk->inodes);
+
+	TRACE("In read_inode_lookup_table, length %d\n", length);
+
+	/* Allocate inode lookup table */
+	if (!(msblk->inode_lookup_table = kmalloc(length, GFP_KERNEL))) {
+		ERROR("Failed to allocate inode lookup table\n");
+		return 0;
+	}
+   
+	if (!squashfs_read_data(s, (char *) msblk->inode_lookup_table,
+			sblk->lookup_table_start, length |
+			SQUASHFS_COMPRESSED_BIT_BLOCK, NULL, length)) {
+		ERROR("unable to read inode lookup table\n");
+		return 0;
+	}
+
+	if (msblk->swap) {
+		int i;
+		long long block;
+
+		for (i = 0; i < SQUASHFS_LOOKUP_BLOCKS(sblk->inodes); i++) {
+			SQUASHFS_SWAP_LOOKUP_BLOCKS((&block),
+						&msblk->inode_lookup_table[i], 1);
+			msblk->inode_lookup_table[i] = block;
+		}
+	}
+
+	return 1;
+}
+
+
+static int read_fragment_index_table(struct super_block *s)
+{
+	struct squashfs_sb_info *msblk = s->s_fs_info;
+	struct squashfs_super_block *sblk = &msblk->sblk;
+	unsigned int length = SQUASHFS_FRAGMENT_INDEX_BYTES(sblk->fragments);
+
+	if(length == 0)
+		return 1;
+
+	/* Allocate fragment index table */
+	if (!(msblk->fragment_index = kmalloc(length, GFP_KERNEL))) {
+		ERROR("Failed to allocate fragment index table\n");
+		return 0;
+	}
+   
+	if (!squashfs_read_data(s, (char *) msblk->fragment_index,
+			sblk->fragment_table_start, length |
+			SQUASHFS_COMPRESSED_BIT_BLOCK, NULL, length)) {
+		ERROR("unable to read fragment index table\n");
+		return 0;
+	}
+
+	if (msblk->swap) {
+		int i;
+		long long fragment;
+
+		for (i = 0; i < SQUASHFS_FRAGMENT_INDEXES(sblk->fragments); i++) {
+			SQUASHFS_SWAP_FRAGMENT_INDEXES((&fragment),
+						&msblk->fragment_index[i], 1);
+			msblk->fragment_index[i] = fragment;
+		}
+	}
+
+	return 1;
+}
+
+
+static int supported_squashfs_filesystem(struct squashfs_sb_info *msblk, int silent)
+{
+	struct squashfs_super_block *sblk = &msblk->sblk;
+
+	msblk->read_inode = squashfs_read_inode;
+	msblk->read_blocklist = read_blocklist;
+	msblk->read_fragment_index_table = read_fragment_index_table;
+
+	if (sblk->s_major == 1) {
+		if (!squashfs_1_0_supported(msblk)) {
+			SERROR("Major/Minor mismatch, Squashfs 1.0 filesystems "
+				"are unsupported\n");
+			SERROR("Please recompile with "
+				"Squashfs 1.0 support enabled\n");
+			return 0;
+		}
+	} else if (sblk->s_major == 2) {
+		if (!squashfs_2_0_supported(msblk)) {
+			SERROR("Major/Minor mismatch, Squashfs 2.0 filesystems "
+				"are unsupported\n");
+			SERROR("Please recompile with "
+				"Squashfs 2.0 support enabled\n");
+			return 0;
+		}
+	} else if(sblk->s_major != SQUASHFS_MAJOR || sblk->s_minor >
+			SQUASHFS_MINOR) {
+		SERROR("Major/Minor mismatch, trying to mount newer %d.%d "
+				"filesystem\n", sblk->s_major, sblk->s_minor);
+		SERROR("Please update your kernel\n");
+		return 0;
+	}
+
+	return 1;
+}
+
+
+static int squashfs_fill_super(struct super_block *s, void *data, int silent)
+{
+	struct squashfs_sb_info *msblk;
+	struct squashfs_super_block *sblk;
+	int i;
+	char b[BDEVNAME_SIZE];
+	struct inode *root;
+
+	TRACE("Entered squashfs_read_superblock\n");
+
+	if (!(s->s_fs_info = kmalloc(sizeof(struct squashfs_sb_info),
+						GFP_KERNEL))) {
+		ERROR("Failed to allocate superblock\n");
+		goto failure;
+	}
+	memset(s->s_fs_info, 0, sizeof(struct squashfs_sb_info));
+	msblk = s->s_fs_info;
+	if (!(msblk->stream.workspace = vmalloc(zlib_inflate_workspacesize()))) {
+		ERROR("Failed to allocate zlib workspace\n");
+		goto failure;
+	}
+	sblk = &msblk->sblk;
+	
+	msblk->devblksize = sb_min_blocksize(s, BLOCK_SIZE);
+	msblk->devblksize_log2 = ffz(~msblk->devblksize);
+
+	mutex_init(&msblk->read_data_mutex);
+	mutex_init(&msblk->read_page_mutex);
+	mutex_init(&msblk->block_cache_mutex);
+	mutex_init(&msblk->fragment_mutex);
+	mutex_init(&msblk->meta_index_mutex);
+	
+	init_waitqueue_head(&msblk->waitq);
+	init_waitqueue_head(&msblk->fragment_wait_queue);
+
+	sblk->bytes_used = sizeof(struct squashfs_super_block);
+	if (!squashfs_read_data(s, (char *) sblk, SQUASHFS_START,
+					sizeof(struct squashfs_super_block) |
+					SQUASHFS_COMPRESSED_BIT_BLOCK, NULL, sizeof(struct squashfs_super_block))) {
+		SERROR("unable to read superblock\n");
+		goto failed_mount;
+	}
+
+	/* Check it is a SQUASHFS superblock */
+	msblk->swap = 0;
+	if ((s->s_magic = sblk->s_magic) != SQUASHFS_MAGIC) {
+		if (sblk->s_magic == SQUASHFS_MAGIC_SWAP) {
+			struct squashfs_super_block ssblk;
+
+			WARNING("Mounting a different endian SQUASHFS "
+				"filesystem on %s\n", bdevname(s->s_bdev, b));
+
+			SQUASHFS_SWAP_SUPER_BLOCK(&ssblk, sblk);
+			memcpy(sblk, &ssblk, sizeof(struct squashfs_super_block));
+			msblk->swap = 1;
+		} else  {
+			SERROR("Can't find a SQUASHFS superblock on %s\n",
+							bdevname(s->s_bdev, b));
+			goto failed_mount;
+		}
+	}
+
+	/* Check the MAJOR & MINOR versions */
+	if(!supported_squashfs_filesystem(msblk, silent))
+		goto failed_mount;
+
+	/* Check the filesystem does not extend beyond the end of the
+	   block device */
+	if(sblk->bytes_used < 0 || sblk->bytes_used > i_size_read(s->s_bdev->bd_inode))
+		goto failed_mount;
+
+	/* Check the root inode for sanity */
+	if (SQUASHFS_INODE_OFFSET(sblk->root_inode) > SQUASHFS_METADATA_SIZE)
+		goto failed_mount;
+
+	TRACE("Found valid superblock on %s\n", bdevname(s->s_bdev, b));
+	TRACE("Inodes are %scompressed\n",
+					SQUASHFS_UNCOMPRESSED_INODES
+					(sblk->flags) ? "un" : "");
+	TRACE("Data is %scompressed\n",
+					SQUASHFS_UNCOMPRESSED_DATA(sblk->flags)
+					? "un" : "");
+	TRACE("Check data is %s present in the filesystem\n",
+					SQUASHFS_CHECK_DATA(sblk->flags) ?
+					"" : "not");
+	TRACE("Filesystem size %lld bytes\n", sblk->bytes_used);
+	TRACE("Block size %d\n", sblk->block_size);
+	TRACE("Number of inodes %d\n", sblk->inodes);
+	if (sblk->s_major > 1)
+		TRACE("Number of fragments %d\n", sblk->fragments);
+	TRACE("Number of uids %d\n", sblk->no_uids);
+	TRACE("Number of gids %d\n", sblk->no_guids);
+	TRACE("sblk->inode_table_start %llx\n", sblk->inode_table_start);
+	TRACE("sblk->directory_table_start %llx\n", sblk->directory_table_start);
+	if (sblk->s_major > 1)
+		TRACE("sblk->fragment_table_start %llx\n",
+					sblk->fragment_table_start);
+	TRACE("sblk->uid_start %llx\n", sblk->uid_start);
+
+	s->s_flags |= MS_RDONLY;
+	s->s_op = &squashfs_super_ops;
+
+	/* Init inode_table block pointer array */
+	if (!(msblk->block_cache = kmalloc(sizeof(struct squashfs_cache) *
+					SQUASHFS_CACHED_BLKS, GFP_KERNEL))) {
+		ERROR("Failed to allocate block cache\n");
+		goto failed_mount;
+	}
+
+	for (i = 0; i < SQUASHFS_CACHED_BLKS; i++)
+		msblk->block_cache[i].block = SQUASHFS_INVALID_BLK;
+
+	msblk->next_cache = 0;
+
+	/* Allocate read_page block */
+	if (!(msblk->read_page = kmalloc(sblk->block_size, GFP_KERNEL))) {
+		ERROR("Failed to allocate read_page block\n");
+		goto failed_mount;
+	}
+
+	/* Allocate uid and gid tables */
+	if (!(msblk->uid = kmalloc((sblk->no_uids + sblk->no_guids) *
+					sizeof(unsigned int), GFP_KERNEL))) {
+		ERROR("Failed to allocate uid/gid table\n");
+		goto failed_mount;
+	}
+	msblk->guid = msblk->uid + sblk->no_uids;
+   
+	if (msblk->swap) {
+		unsigned int suid[sblk->no_uids + sblk->no_guids];
+
+		if (!squashfs_read_data(s, (char *) &suid, sblk->uid_start,
+					((sblk->no_uids + sblk->no_guids) *
+					 sizeof(unsigned int)) |
+					SQUASHFS_COMPRESSED_BIT_BLOCK, NULL, (sblk->no_uids + sblk->no_guids) * sizeof(unsigned int))) {
+			ERROR("unable to read uid/gid table\n");
+			goto failed_mount;
+		}
+
+		SQUASHFS_SWAP_DATA(msblk->uid, suid, (sblk->no_uids +
+			sblk->no_guids), (sizeof(unsigned int) * 8));
+	} else
+		if (!squashfs_read_data(s, (char *) msblk->uid, sblk->uid_start,
+					((sblk->no_uids + sblk->no_guids) *
+					 sizeof(unsigned int)) |
+					SQUASHFS_COMPRESSED_BIT_BLOCK, NULL, (sblk->no_uids + sblk->no_guids) * sizeof(unsigned int))) {
+			ERROR("unable to read uid/gid table\n");
+			goto failed_mount;
+		}
+
+
+	if (sblk->s_major == 1 && squashfs_1_0_supported(msblk))
+		goto allocate_root;
+
+	if (!(msblk->fragment = kmalloc(sizeof(struct squashfs_fragment_cache) *
+				SQUASHFS_CACHED_FRAGMENTS, GFP_KERNEL))) {
+		ERROR("Failed to allocate fragment block cache\n");
+		goto failed_mount;
+	}
+
+	for (i = 0; i < SQUASHFS_CACHED_FRAGMENTS; i++) {
+		msblk->fragment[i].locked = 0;
+		msblk->fragment[i].block = SQUASHFS_INVALID_BLK;
+		msblk->fragment[i].data = NULL;
+	}
+
+	msblk->next_fragment = 0;
+
+	/* Allocate and read fragment index table */
+	if (msblk->read_fragment_index_table(s) == 0)
+		goto failed_mount;
+
+	if(sblk->s_major < 3 || sblk->lookup_table_start == SQUASHFS_INVALID_BLK)
+		goto allocate_root;
+
+	/* Allocate and read inode lookup table */
+	if (read_inode_lookup_table(s) == 0)
+		goto failed_mount;
+
+	s->s_op = &squashfs_export_super_ops;
+	s->s_export_op = &squashfs_export_ops;
+
+allocate_root:
+	root = new_inode(s);
+	if ((msblk->read_inode)(root, sblk->root_inode) == 0)
+		goto failed_mount;
+	insert_inode_hash(root);
+
+	if ((s->s_root = d_alloc_root(root)) == NULL) {
+		ERROR("Root inode create failed\n");
+		iput(root);
+		goto failed_mount;
+	}
+
+	TRACE("Leaving squashfs_read_super\n");
+	return 0;
+
+failed_mount:
+	kfree(msblk->inode_lookup_table);
+	kfree(msblk->fragment_index);
+	kfree(msblk->fragment);
+	kfree(msblk->uid);
+	kfree(msblk->read_page);
+	kfree(msblk->block_cache);
+	kfree(msblk->fragment_index_2);
+	vfree(msblk->stream.workspace);
+	kfree(s->s_fs_info);
+	s->s_fs_info = NULL;
+	return -EINVAL;
+
+failure:
+	return -ENOMEM;
+}
+
+
+static int squashfs_statfs(struct dentry *dentry, struct kstatfs *buf)
+{
+	struct squashfs_sb_info *msblk = dentry->d_sb->s_fs_info;
+	struct squashfs_super_block *sblk = &msblk->sblk;
+
+	TRACE("Entered squashfs_statfs\n");
+
+	buf->f_type = SQUASHFS_MAGIC;
+	buf->f_bsize = sblk->block_size;
+	buf->f_blocks = ((sblk->bytes_used - 1) >> sblk->block_log) + 1;
+	buf->f_bfree = buf->f_bavail = 0;
+	buf->f_files = sblk->inodes;
+	buf->f_ffree = 0;
+	buf->f_namelen = SQUASHFS_NAME_LEN;
+
+	return 0;
+}
+
+
+static int squashfs_symlink_readpage(struct file *file, struct page *page)
+{
+	struct inode *inode = page->mapping->host;
+	int index = page->index << PAGE_CACHE_SHIFT, length, bytes;
+	long long block = SQUASHFS_I(inode)->start_block;
+	int offset = SQUASHFS_I(inode)->offset;
+	void *pageaddr = kmap(page);
+
+	TRACE("Entered squashfs_symlink_readpage, page index %ld, start block "
+				"%llx, offset %x\n", page->index,
+				SQUASHFS_I(inode)->start_block,
+				SQUASHFS_I(inode)->offset);
+
+	for (length = 0; length < index; length += bytes) {
+		if (!(bytes = squashfs_get_cached_block(inode->i_sb, NULL,
+				block, offset, PAGE_CACHE_SIZE, &block,
+				&offset))) {
+			ERROR("Unable to read symbolic link [%llx:%x]\n", block,
+					offset);
+			goto skip_read;
+		}
+	}
+
+	if (length != index) {
+		ERROR("(squashfs_symlink_readpage) length != index\n");
+		bytes = 0;
+		goto skip_read;
+	}
+
+	bytes = (i_size_read(inode) - length) > PAGE_CACHE_SIZE ? PAGE_CACHE_SIZE :
+					i_size_read(inode) - length;
+
+	if (!(bytes = squashfs_get_cached_block(inode->i_sb, pageaddr, block,
+					offset, bytes, &block, &offset)))
+		ERROR("Unable to read symbolic link [%llx:%x]\n", block, offset);
+
+skip_read:
+	memset(pageaddr + bytes, 0, PAGE_CACHE_SIZE - bytes);
+	kunmap(page);
+	flush_dcache_page(page);
+	SetPageUptodate(page);
+	unlock_page(page);
+
+	return 0;
+}
+
+
+struct meta_index *locate_meta_index(struct inode *inode, int index, int offset)
+{
+	struct meta_index *meta = NULL;
+	struct squashfs_sb_info *msblk = inode->i_sb->s_fs_info;
+	int i;
+
+	mutex_lock(&msblk->meta_index_mutex);
+
+	TRACE("locate_meta_index: index %d, offset %d\n", index, offset);
+
+	if(msblk->meta_index == NULL)
+		goto not_allocated;
+
+	for (i = 0; i < SQUASHFS_META_NUMBER; i ++)
+		if (msblk->meta_index[i].inode_number == inode->i_ino &&
+				msblk->meta_index[i].offset >= offset &&
+				msblk->meta_index[i].offset <= index &&
+				msblk->meta_index[i].locked == 0) {
+			TRACE("locate_meta_index: entry %d, offset %d\n", i,
+					msblk->meta_index[i].offset);
+			meta = &msblk->meta_index[i];
+			offset = meta->offset;
+		}
+
+	if (meta)
+		meta->locked = 1;
+
+not_allocated:
+	mutex_unlock(&msblk->meta_index_mutex);
+
+	return meta;
+}
+
+
+struct meta_index *empty_meta_index(struct inode *inode, int offset, int skip)
+{
+	struct squashfs_sb_info *msblk = inode->i_sb->s_fs_info;
+	struct meta_index *meta = NULL;
+	int i;
+
+	mutex_lock(&msblk->meta_index_mutex);
+
+	TRACE("empty_meta_index: offset %d, skip %d\n", offset, skip);
+
+	if(msblk->meta_index == NULL) {
+		if (!(msblk->meta_index = kmalloc(sizeof(struct meta_index) *
+					SQUASHFS_META_NUMBER, GFP_KERNEL))) {
+			ERROR("Failed to allocate meta_index\n");
+			goto failed;
+		}
+		for(i = 0; i < SQUASHFS_META_NUMBER; i++) {
+			msblk->meta_index[i].inode_number = 0;
+			msblk->meta_index[i].locked = 0;
+		}
+		msblk->next_meta_index = 0;
+	}
+
+	for(i = SQUASHFS_META_NUMBER; i &&
+			msblk->meta_index[msblk->next_meta_index].locked; i --)
+		msblk->next_meta_index = (msblk->next_meta_index + 1) %
+			SQUASHFS_META_NUMBER;
+
+	if(i == 0) {
+		TRACE("empty_meta_index: failed!\n");
+		goto failed;
+	}
+
+	TRACE("empty_meta_index: returned meta entry %d, %p\n",
+			msblk->next_meta_index,
+			&msblk->meta_index[msblk->next_meta_index]);
+
+	meta = &msblk->meta_index[msblk->next_meta_index];
+	msblk->next_meta_index = (msblk->next_meta_index + 1) %
+			SQUASHFS_META_NUMBER;
+
+	meta->inode_number = inode->i_ino;
+	meta->offset = offset;
+	meta->skip = skip;
+	meta->entries = 0;
+	meta->locked = 1;
+
+failed:
+	mutex_unlock(&msblk->meta_index_mutex);
+	return meta;
+}
+
+
+void release_meta_index(struct inode *inode, struct meta_index *meta)
+{
+	meta->locked = 0;
+	smp_mb();
+}
+
+
+static int read_block_index(struct super_block *s, int blocks, char *block_list,
+		long long *start_block, int *offset)
+{
+	struct squashfs_sb_info *msblk = s->s_fs_info;
+	unsigned int *block_listp;
+	int block = 0;
+	
+	if (msblk->swap) {
+		char sblock_list[blocks << 2];
+
+		if (!squashfs_get_cached_block(s, sblock_list, *start_block,
+				*offset, blocks << 2, start_block, offset)) {
+			ERROR("Unable to read block list [%llx:%x]\n",
+				*start_block, *offset);
+			goto failure;
+		}
+		SQUASHFS_SWAP_INTS(((unsigned int *)block_list),
+				((unsigned int *)sblock_list), blocks);
+	} else
+		if (!squashfs_get_cached_block(s, block_list, *start_block,
+				*offset, blocks << 2, start_block, offset)) {
+			ERROR("Unable to read block list [%llx:%x]\n",
+				*start_block, *offset);
+			goto failure;
+		}
+
+	for (block_listp = (unsigned int *) block_list; blocks;
+				block_listp++, blocks --)
+		block += SQUASHFS_COMPRESSED_SIZE_BLOCK(*block_listp);
+
+	return block;
+
+failure:
+	return -1;
+}
+
+
+#define SIZE 256
+
+static inline int calculate_skip(int blocks) {
+	int skip = (blocks - 1) / ((SQUASHFS_SLOTS * SQUASHFS_META_ENTRIES + 1) * SQUASHFS_META_INDEXES);
+	return skip >= 7 ? 7 : skip + 1;
+}
+
+
+static int get_meta_index(struct inode *inode, int index,
+		long long *index_block, int *index_offset,
+		long long *data_block, char *block_list)
+{
+	struct squashfs_sb_info *msblk = inode->i_sb->s_fs_info;
+	struct squashfs_super_block *sblk = &msblk->sblk;
+	int skip = calculate_skip(i_size_read(inode) >> sblk->block_log);
+	int offset = 0;
+	struct meta_index *meta;
+	struct meta_entry *meta_entry;
+	long long cur_index_block = SQUASHFS_I(inode)->u.s1.block_list_start;
+	int cur_offset = SQUASHFS_I(inode)->offset;
+	long long cur_data_block = SQUASHFS_I(inode)->start_block;
+	int i;
+ 
+	index /= SQUASHFS_META_INDEXES * skip;
+
+	while ( offset < index ) {
+		meta = locate_meta_index(inode, index, offset + 1);
+
+		if (meta == NULL) {
+			if ((meta = empty_meta_index(inode, offset + 1,
+							skip)) == NULL)
+				goto all_done;
+		} else {
+			if(meta->entries == 0)
+				goto failed;
+			offset = index < meta->offset + meta->entries ? index :
+				meta->offset + meta->entries - 1;
+			meta_entry = &meta->meta_entry[offset - meta->offset];
+			cur_index_block = meta_entry->index_block + sblk->inode_table_start;
+			cur_offset = meta_entry->offset;
+			cur_data_block = meta_entry->data_block;
+			TRACE("get_meta_index: offset %d, meta->offset %d, "
+				"meta->entries %d\n", offset, meta->offset,
+				meta->entries);
+			TRACE("get_meta_index: index_block 0x%llx, offset 0x%x"
+				" data_block 0x%llx\n", cur_index_block,
+				cur_offset, cur_data_block);
+		}
+
+		for (i = meta->offset + meta->entries; i <= index &&
+				i < meta->offset + SQUASHFS_META_ENTRIES; i++) {
+			int blocks = skip * SQUASHFS_META_INDEXES;
+
+			while (blocks) {
+				int block = blocks > (SIZE >> 2) ? (SIZE >> 2) :
+					blocks;
+				int res = read_block_index(inode->i_sb, block,
+					block_list, &cur_index_block,
+					&cur_offset);
+
+				if (res == -1)
+					goto failed;
+
+				cur_data_block += res;
+				blocks -= block;
+			}
+
+			meta_entry = &meta->meta_entry[i - meta->offset];
+			meta_entry->index_block = cur_index_block - sblk->inode_table_start;
+			meta_entry->offset = cur_offset;
+			meta_entry->data_block = cur_data_block;
+			meta->entries ++;
+			offset ++;
+		}
+
+		TRACE("get_meta_index: meta->offset %d, meta->entries %d\n",
+				meta->offset, meta->entries);
+
+		release_meta_index(inode, meta);
+	}
+
+all_done:
+	*index_block = cur_index_block;
+	*index_offset = cur_offset;
+	*data_block = cur_data_block;
+
+	return offset * SQUASHFS_META_INDEXES * skip;
+
+failed:
+	release_meta_index(inode, meta);
+	return -1;
+}
+
+
+static long long read_blocklist(struct inode *inode, int index,
+				int readahead_blks, char *block_list,
+				unsigned short **block_p, unsigned int *bsize)
+{
+	long long block_ptr;
+	int offset;
+	long long block;
+	int res = get_meta_index(inode, index, &block_ptr, &offset, &block,
+		block_list);
+
+	TRACE("read_blocklist: res %d, index %d, block_ptr 0x%llx, offset"
+		       " 0x%x, block 0x%llx\n", res, index, block_ptr, offset,
+		       block);
+
+	if(res == -1)
+		goto failure;
+
+	index -= res;
+
+	while ( index ) {
+		int blocks = index > (SIZE >> 2) ? (SIZE >> 2) : index;
+		int res = read_block_index(inode->i_sb, blocks, block_list,
+			&block_ptr, &offset);
+		if (res == -1)
+			goto failure;
+		block += res;
+		index -= blocks;
+	}
+
+	if (read_block_index(inode->i_sb, 1, block_list,
+			&block_ptr, &offset) == -1)
+		goto failure;
+	*bsize = *((unsigned int *) block_list);
+
+	return block;
+
+failure:
+	return 0;
+}
+
+
+static int squashfs_readpage(struct file *file, struct page *page)
+{
+	struct inode *inode = page->mapping->host;
+	struct squashfs_sb_info *msblk = inode->i_sb->s_fs_info;
+	struct squashfs_super_block *sblk = &msblk->sblk;
+	unsigned char *block_list;
+	long long block;
+	unsigned int bsize, i = 0, bytes = 0, byte_offset = 0;
+	int index = page->index >> (sblk->block_log - PAGE_CACHE_SHIFT);
+ 	void *pageaddr;
+	struct squashfs_fragment_cache *fragment = NULL;
+	char *data_ptr = msblk->read_page;
+	
+	int mask = (1 << (sblk->block_log - PAGE_CACHE_SHIFT)) - 1;
+	int start_index = page->index & ~mask;
+	int end_index = start_index | mask;
+
+	TRACE("Entered squashfs_readpage, page index %lx, start block %llx\n",
+					page->index,
+					SQUASHFS_I(inode)->start_block);
+
+	if (!(block_list = kmalloc(SIZE, GFP_KERNEL))) {
+		ERROR("Failed to allocate block_list\n");
+		goto skip_read;
+	}
+
+	if (page->index >= ((i_size_read(inode) + PAGE_CACHE_SIZE - 1) >>
+					PAGE_CACHE_SHIFT))
+		goto skip_read;
+
+	if (SQUASHFS_I(inode)->u.s1.fragment_start_block == SQUASHFS_INVALID_BLK
+					|| index < (i_size_read(inode) >>
+					sblk->block_log)) {
+		if ((block = (msblk->read_blocklist)(inode, index, 1,
+					block_list, NULL, &bsize)) == 0)
+			goto skip_read;
+
+		mutex_lock(&msblk->read_page_mutex);
+		
+		if (!(bytes = squashfs_read_data(inode->i_sb, msblk->read_page,
+					block, bsize, NULL, sblk->block_size))) {
+			ERROR("Unable to read page, block %llx, size %x\n", block,
+					bsize);
+			mutex_unlock(&msblk->read_page_mutex);
+			goto skip_read;
+		}
+	} else {
+		if ((fragment = get_cached_fragment(inode->i_sb,
+					SQUASHFS_I(inode)->
+					u.s1.fragment_start_block,
+					SQUASHFS_I(inode)->u.s1.fragment_size))
+					== NULL) {
+			ERROR("Unable to read page, block %llx, size %x\n",
+					SQUASHFS_I(inode)->
+					u.s1.fragment_start_block,
+					(int) SQUASHFS_I(inode)->
+					u.s1.fragment_size);
+			goto skip_read;
+		}
+		bytes = SQUASHFS_I(inode)->u.s1.fragment_offset +
+					(i_size_read(inode) & (sblk->block_size
+					- 1));
+		byte_offset = SQUASHFS_I(inode)->u.s1.fragment_offset;
+		data_ptr = fragment->data;
+	}
+
+	for (i = start_index; i <= end_index && byte_offset < bytes;
+					i++, byte_offset += PAGE_CACHE_SIZE) {
+		struct page *push_page;
+		int avail = (bytes - byte_offset) > PAGE_CACHE_SIZE ?
+					PAGE_CACHE_SIZE : bytes - byte_offset;
+
+		TRACE("bytes %d, i %d, byte_offset %d, available_bytes %d\n",
+					bytes, i, byte_offset, avail);
+
+		push_page = (i == page->index) ? page :
+			grab_cache_page_nowait(page->mapping, i);
+
+		if (!push_page)
+			continue;
+
+		if (PageUptodate(push_page))
+			goto skip_page;
+
+ 		pageaddr = kmap_atomic(push_page, KM_USER0);
+		memcpy(pageaddr, data_ptr + byte_offset, avail);
+		memset(pageaddr + avail, 0, PAGE_CACHE_SIZE - avail);
+		kunmap_atomic(pageaddr, KM_USER0);
+		flush_dcache_page(push_page);
+		SetPageUptodate(push_page);
+skip_page:
+		unlock_page(push_page);
+		if(i != page->index)
+			page_cache_release(push_page);
+	}
+
+	if (SQUASHFS_I(inode)->u.s1.fragment_start_block == SQUASHFS_INVALID_BLK
+					|| index < (i_size_read(inode) >>
+					sblk->block_log))
+		mutex_unlock(&msblk->read_page_mutex);
+	else
+		release_cached_fragment(msblk, fragment);
+
+	kfree(block_list);
+	return 0;
+
+skip_read:
+	pageaddr = kmap_atomic(page, KM_USER0);
+	memset(pageaddr + bytes, 0, PAGE_CACHE_SIZE - bytes);
+	kunmap_atomic(pageaddr, KM_USER0);
+	flush_dcache_page(page);
+	SetPageUptodate(page);
+	unlock_page(page);
+
+	kfree(block_list);
+	return 0;
+}
+
+
+static int squashfs_readpage4K(struct file *file, struct page *page)
+{
+	struct inode *inode = page->mapping->host;
+	struct squashfs_sb_info *msblk = inode->i_sb->s_fs_info;
+	struct squashfs_super_block *sblk = &msblk->sblk;
+	unsigned char *block_list;
+	long long block;
+	unsigned int bsize, bytes = 0;
+ 	void *pageaddr;
+	
+	TRACE("Entered squashfs_readpage4K, page index %lx, start block %llx\n",
+					page->index,
+					SQUASHFS_I(inode)->start_block);
+
+	if (page->index >= ((i_size_read(inode) + PAGE_CACHE_SIZE - 1) >>
+					PAGE_CACHE_SHIFT)) {
+		block_list = NULL;
+		goto skip_read;
+	}
+
+	if (!(block_list = kmalloc(SIZE, GFP_KERNEL))) {
+		ERROR("Failed to allocate block_list\n");
+		goto skip_read;
+	}
+
+	if (SQUASHFS_I(inode)->u.s1.fragment_start_block == SQUASHFS_INVALID_BLK
+					|| page->index < (i_size_read(inode) >>
+					sblk->block_log)) {
+		block = (msblk->read_blocklist)(inode, page->index, 1,
+					block_list, NULL, &bsize);
+		if(block == 0)
+			goto skip_read;
+
+		mutex_lock(&msblk->read_page_mutex);
+		bytes = squashfs_read_data(inode->i_sb, msblk->read_page, block,
+					bsize, NULL, sblk->block_size);
+		if (bytes) {
+			pageaddr = kmap_atomic(page, KM_USER0);
+			memcpy(pageaddr, msblk->read_page, bytes);
+			kunmap_atomic(pageaddr, KM_USER0);
+		} else
+			ERROR("Unable to read page, block %llx, size %x\n",
+					block, bsize);
+		mutex_unlock(&msblk->read_page_mutex);
+	} else {
+		struct squashfs_fragment_cache *fragment =
+			get_cached_fragment(inode->i_sb,
+					SQUASHFS_I(inode)->
+					u.s1.fragment_start_block,
+					SQUASHFS_I(inode)-> u.s1.fragment_size);
+		if (fragment) {
+			bytes = i_size_read(inode) & (sblk->block_size - 1);
+			pageaddr = kmap_atomic(page, KM_USER0);
+			memcpy(pageaddr, fragment->data + SQUASHFS_I(inode)->
+					u.s1.fragment_offset, bytes);
+			kunmap_atomic(pageaddr, KM_USER0);
+			release_cached_fragment(msblk, fragment);
+		} else
+			ERROR("Unable to read page, block %llx, size %x\n",
+					SQUASHFS_I(inode)->
+					u.s1.fragment_start_block, (int)
+					SQUASHFS_I(inode)-> u.s1.fragment_size);
+	}
+
+skip_read:
+	pageaddr = kmap_atomic(page, KM_USER0);
+	memset(pageaddr + bytes, 0, PAGE_CACHE_SIZE - bytes);
+	kunmap_atomic(pageaddr, KM_USER0);
+	flush_dcache_page(page);
+	SetPageUptodate(page);
+	unlock_page(page);
+
+	kfree(block_list);
+	return 0;
+}
+
+
+static int get_dir_index_using_offset(struct super_block *s, long long 
+				*next_block, unsigned int *next_offset,
+				long long index_start,
+				unsigned int index_offset, int i_count,
+				long long f_pos)
+{
+	struct squashfs_sb_info *msblk = s->s_fs_info;
+	struct squashfs_super_block *sblk = &msblk->sblk;
+	int i, length = 0;
+	struct squashfs_dir_index index;
+
+	TRACE("Entered get_dir_index_using_offset, i_count %d, f_pos %d\n",
+					i_count, (unsigned int) f_pos);
+
+	f_pos =- 3;
+	if (f_pos == 0)
+		goto finish;
+
+	for (i = 0; i < i_count; i++) {
+		if (msblk->swap) {
+			struct squashfs_dir_index sindex;
+			squashfs_get_cached_block(s, (char *) &sindex,
+					index_start, index_offset,
+					sizeof(sindex), &index_start,
+					&index_offset);
+			SQUASHFS_SWAP_DIR_INDEX(&index, &sindex);
+		} else
+			squashfs_get_cached_block(s, (char *) &index,
+					index_start, index_offset,
+					sizeof(index), &index_start,
+					&index_offset);
+
+		if (index.index > f_pos)
+			break;
+
+		squashfs_get_cached_block(s, NULL, index_start, index_offset,
+					index.size + 1, &index_start,
+					&index_offset);
+
+		length = index.index;
+		*next_block = index.start_block + sblk->directory_table_start;
+	}
+
+	*next_offset = (length + *next_offset) % SQUASHFS_METADATA_SIZE;
+
+finish:
+	return length + 3;
+}
+
+
+static int get_dir_index_using_name(struct super_block *s, long long
+				*next_block, unsigned int *next_offset,
+				long long index_start,
+				unsigned int index_offset, int i_count,
+				const char *name, int size)
+{
+	struct squashfs_sb_info *msblk = s->s_fs_info;
+	struct squashfs_super_block *sblk = &msblk->sblk;
+	int i, length = 0;
+	struct squashfs_dir_index *index;
+	char *str;
+
+	TRACE("Entered get_dir_index_using_name, i_count %d\n", i_count);
+
+	if (!(str = kmalloc(sizeof(struct squashfs_dir_index) +
+		(SQUASHFS_NAME_LEN + 1) * 2, GFP_KERNEL))) {
+		ERROR("Failed to allocate squashfs_dir_index\n");
+		goto failure;
+	}
+
+	index = (struct squashfs_dir_index *) (str + SQUASHFS_NAME_LEN + 1);
+	strncpy(str, name, size);
+	str[size] = '\0';
+
+	for (i = 0; i < i_count; i++) {
+		if (msblk->swap) {
+			struct squashfs_dir_index sindex;
+			squashfs_get_cached_block(s, (char *) &sindex,
+					index_start, index_offset,
+					sizeof(sindex), &index_start,
+					&index_offset);
+			SQUASHFS_SWAP_DIR_INDEX(index, &sindex);
+		} else
+			squashfs_get_cached_block(s, (char *) index,
+					index_start, index_offset,
+					sizeof(struct squashfs_dir_index),
+					&index_start, &index_offset);
+
+		squashfs_get_cached_block(s, index->name, index_start,
+					index_offset, index->size + 1,
+					&index_start, &index_offset);
+
+		index->name[index->size + 1] = '\0';
+
+		if (strcmp(index->name, str) > 0)
+			break;
+
+		length = index->index;
+		*next_block = index->start_block + sblk->directory_table_start;
+	}
+
+	*next_offset = (length + *next_offset) % SQUASHFS_METADATA_SIZE;
+	kfree(str);
+failure:
+	return length + 3;
+}
+
+		
+static int squashfs_readdir(struct file *file, void *dirent, filldir_t filldir)
+{
+	struct inode *i = file->f_dentry->d_inode;
+	struct squashfs_sb_info *msblk = i->i_sb->s_fs_info;
+	struct squashfs_super_block *sblk = &msblk->sblk;
+	long long next_block = SQUASHFS_I(i)->start_block +
+		sblk->directory_table_start;
+	int next_offset = SQUASHFS_I(i)->offset, length = 0,
+		dir_count;
+	struct squashfs_dir_header dirh;
+	struct squashfs_dir_entry *dire;
+
+	TRACE("Entered squashfs_readdir [%llx:%x]\n", next_block, next_offset);
+
+	if (!(dire = kmalloc(sizeof(struct squashfs_dir_entry) +
+		SQUASHFS_NAME_LEN + 1, GFP_KERNEL))) {
+		ERROR("Failed to allocate squashfs_dir_entry\n");
+		goto finish;
+	}
+
+	while(file->f_pos < 3) {
+		char *name;
+		int size, i_ino;
+
+		if(file->f_pos == 0) {
+			name = ".";
+			size = 1;
+			i_ino = i->i_ino;
+		} else {
+			name = "..";
+			size = 2;
+			i_ino = SQUASHFS_I(i)->u.s2.parent_inode;
+		}
+		TRACE("Calling filldir(%x, %s, %d, %d, %d, %d)\n",
+				(unsigned int) dirent, name, size, (int)
+				file->f_pos, i_ino,
+				squashfs_filetype_table[1]);
+
+		if (filldir(dirent, name, size,
+				file->f_pos, i_ino,
+				squashfs_filetype_table[1]) < 0) {
+				TRACE("Filldir returned less than 0\n");
+				goto finish;
+		}
+		file->f_pos += size;
+	}
+
+	length = get_dir_index_using_offset(i->i_sb, &next_block, &next_offset,
+				SQUASHFS_I(i)->u.s2.directory_index_start,
+				SQUASHFS_I(i)->u.s2.directory_index_offset,
+				SQUASHFS_I(i)->u.s2.directory_index_count,
+				file->f_pos);
+
+	while (length < i_size_read(i)) {
+		/* read directory header */
+		if (msblk->swap) {
+			struct squashfs_dir_header sdirh;
+			
+			if (!squashfs_get_cached_block(i->i_sb, (char *) &sdirh,
+					next_block, next_offset, sizeof(sdirh),
+					&next_block, &next_offset))
+				goto failed_read;
+
+			length += sizeof(sdirh);
+			SQUASHFS_SWAP_DIR_HEADER(&dirh, &sdirh);
+		} else {
+			if (!squashfs_get_cached_block(i->i_sb, (char *) &dirh,
+					next_block, next_offset, sizeof(dirh),
+					&next_block, &next_offset))
+				goto failed_read;
+
+			length += sizeof(dirh);
+		}
+
+		dir_count = dirh.count + 1;
+		while (dir_count--) {
+			if (msblk->swap) {
+				struct squashfs_dir_entry sdire;
+				if (!squashfs_get_cached_block(i->i_sb, (char *)
+						&sdire, next_block, next_offset,
+						sizeof(sdire), &next_block,
+						&next_offset))
+					goto failed_read;
+				
+				length += sizeof(sdire);
+				SQUASHFS_SWAP_DIR_ENTRY(dire, &sdire);
+			} else {
+				if (!squashfs_get_cached_block(i->i_sb, (char *)
+						dire, next_block, next_offset,
+						sizeof(*dire), &next_block,
+						&next_offset))
+					goto failed_read;
+
+				length += sizeof(*dire);
+			}
+
+			if (!squashfs_get_cached_block(i->i_sb, dire->name,
+						next_block, next_offset,
+						dire->size + 1, &next_block,
+						&next_offset))
+				goto failed_read;
+
+			length += dire->size + 1;
+
+			if (file->f_pos >= length)
+				continue;
+
+			dire->name[dire->size + 1] = '\0';
+
+			TRACE("Calling filldir(%x, %s, %d, %d, %x:%x, %d, %d)\n",
+					(unsigned int) dirent, dire->name,
+					dire->size + 1, (int) file->f_pos,
+					dirh.start_block, dire->offset,
+					dirh.inode_number + dire->inode_number,
+					squashfs_filetype_table[dire->type]);
+
+			if (filldir(dirent, dire->name, dire->size + 1,
+					file->f_pos,
+					dirh.inode_number + dire->inode_number,
+					squashfs_filetype_table[dire->type])
+					< 0) {
+				TRACE("Filldir returned less than 0\n");
+				goto finish;
+			}
+			file->f_pos = length;
+		}
+	}
+
+finish:
+	kfree(dire);
+	return 0;
+
+failed_read:
+	ERROR("Unable to read directory block [%llx:%x]\n", next_block,
+		next_offset);
+	kfree(dire);
+	return 0;
+}
+
+
+static struct dentry *squashfs_lookup(struct inode *i, struct dentry *dentry,
+				struct nameidata *nd)
+{
+	const unsigned char *name = dentry->d_name.name;
+	int len = dentry->d_name.len;
+	struct inode *inode = NULL;
+	struct squashfs_sb_info *msblk = i->i_sb->s_fs_info;
+	struct squashfs_super_block *sblk = &msblk->sblk;
+	long long next_block = SQUASHFS_I(i)->start_block +
+				sblk->directory_table_start;
+	int next_offset = SQUASHFS_I(i)->offset, length = 0,
+				dir_count;
+	struct squashfs_dir_header dirh;
+	struct squashfs_dir_entry *dire;
+
+	TRACE("Entered squashfs_lookup [%llx:%x]\n", next_block, next_offset);
+
+	if (!(dire = kmalloc(sizeof(struct squashfs_dir_entry) +
+		SQUASHFS_NAME_LEN + 1, GFP_KERNEL))) {
+		ERROR("Failed to allocate squashfs_dir_entry\n");
+		goto exit_lookup;
+	}
+
+	if (len > SQUASHFS_NAME_LEN)
+		goto exit_lookup;
+
+	length = get_dir_index_using_name(i->i_sb, &next_block, &next_offset,
+				SQUASHFS_I(i)->u.s2.directory_index_start,
+				SQUASHFS_I(i)->u.s2.directory_index_offset,
+				SQUASHFS_I(i)->u.s2.directory_index_count, name,
+				len);
+
+	while (length < i_size_read(i)) {
+		/* read directory header */
+		if (msblk->swap) {
+			struct squashfs_dir_header sdirh;
+			if (!squashfs_get_cached_block(i->i_sb, (char *) &sdirh,
+					next_block, next_offset, sizeof(sdirh),
+					&next_block, &next_offset))
+				goto failed_read;
+
+			length += sizeof(sdirh);
+			SQUASHFS_SWAP_DIR_HEADER(&dirh, &sdirh);
+		} else {
+			if (!squashfs_get_cached_block(i->i_sb, (char *) &dirh,
+					next_block, next_offset, sizeof(dirh),
+					&next_block, &next_offset))
+				goto failed_read;
+
+			length += sizeof(dirh);
+		}
+
+		dir_count = dirh.count + 1;
+		while (dir_count--) {
+			if (msblk->swap) {
+				struct squashfs_dir_entry sdire;
+				if (!squashfs_get_cached_block(i->i_sb, (char *)
+						&sdire, next_block,next_offset,
+						sizeof(sdire), &next_block,
+						&next_offset))
+					goto failed_read;
+				
+				length += sizeof(sdire);
+				SQUASHFS_SWAP_DIR_ENTRY(dire, &sdire);
+			} else {
+				if (!squashfs_get_cached_block(i->i_sb, (char *)
+						dire, next_block,next_offset,
+						sizeof(*dire), &next_block,
+						&next_offset))
+					goto failed_read;
+
+				length += sizeof(*dire);
+			}
+
+			if (!squashfs_get_cached_block(i->i_sb, dire->name,
+					next_block, next_offset, dire->size + 1,
+					&next_block, &next_offset))
+				goto failed_read;
+
+			length += dire->size + 1;
+
+			if (name[0] < dire->name[0])
+				goto exit_lookup;
+
+			if ((len == dire->size + 1) && !strncmp(name, dire->name, len)) {
+				squashfs_inode_t ino = SQUASHFS_MKINODE(dirh.start_block,
+								dire->offset);
+
+				TRACE("calling squashfs_iget for directory "
+					"entry %s, inode %x:%x, %d\n", name,
+					dirh.start_block, dire->offset,
+					dirh.inode_number + dire->inode_number);
+
+				inode = squashfs_iget(i->i_sb, ino, dirh.inode_number + dire->inode_number);
+
+				goto exit_lookup;
+			}
+		}
+	}
+
+exit_lookup:
+	kfree(dire);
+	if (inode)
+		return d_splice_alias(inode, dentry);
+	d_add(dentry, inode);
+	return ERR_PTR(0);
+
+failed_read:
+	ERROR("Unable to read directory block [%llx:%x]\n", next_block,
+		next_offset);
+	goto exit_lookup;
+}
+
+
+static int squashfs_remount(struct super_block *s, int *flags, char *data)
+{
+	*flags |= MS_RDONLY;
+	return 0;
+}
+
+
+static void squashfs_put_super(struct super_block *s)
+{
+	int i;
+
+	if (s->s_fs_info) {
+		struct squashfs_sb_info *sbi = s->s_fs_info;
+		if (sbi->block_cache)
+			for (i = 0; i < SQUASHFS_CACHED_BLKS; i++)
+				if (sbi->block_cache[i].block !=
+							SQUASHFS_INVALID_BLK)
+					kfree(sbi->block_cache[i].data);
+		if (sbi->fragment)
+			for (i = 0; i < SQUASHFS_CACHED_FRAGMENTS; i++) 
+				SQUASHFS_FREE(sbi->fragment[i].data);
+		kfree(sbi->fragment);
+		kfree(sbi->block_cache);
+		kfree(sbi->read_page);
+		kfree(sbi->uid);
+		kfree(sbi->fragment_index);
+		kfree(sbi->fragment_index_2);
+		kfree(sbi->meta_index);
+		vfree(sbi->stream.workspace);
+		kfree(s->s_fs_info);
+		s->s_fs_info = NULL;
+	}
+}
+
+
+static int squashfs_get_sb(struct file_system_type *fs_type, int flags,
+				const char *dev_name, void *data,
+				struct vfsmount *mnt)
+{
+	return get_sb_bdev(fs_type, flags, dev_name, data, squashfs_fill_super,
+				mnt);
+}
+
+
+static int __init init_squashfs_fs(void)
+{
+	int err = init_inodecache();
+	if (err)
+		goto out;
+
+	printk(KERN_INFO "squashfs: version 3.2-r2 (2007/01/15) "
+		"Phillip Lougher\n");
+
+	if ((err = register_filesystem(&squashfs_fs_type)))
+		destroy_inodecache();
+
+out:
+	return err;
+}
+
+
+static void __exit exit_squashfs_fs(void)
+{
+	unregister_filesystem(&squashfs_fs_type);
+	destroy_inodecache();
+}
+
+
+static struct kmem_cache * squashfs_inode_cachep;
+
+
+static struct inode *squashfs_alloc_inode(struct super_block *sb)
+{
+	struct squashfs_inode_info *ei;
+	ei = kmem_cache_alloc(squashfs_inode_cachep, GFP_KERNEL);
+	if (!ei)
+		return NULL;
+	return &ei->vfs_inode;
+}
+
+
+static void squashfs_destroy_inode(struct inode *inode)
+{
+	kmem_cache_free(squashfs_inode_cachep, SQUASHFS_I(inode));
+}
+
+
+static void init_once(void * foo, struct kmem_cache * cachep, unsigned long flags)
+{
+	struct squashfs_inode_info *ei = foo;
+
+	if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
+							SLAB_CTOR_CONSTRUCTOR)
+		inode_init_once(&ei->vfs_inode);
+}
+ 
+
+static int __init init_inodecache(void)
+{
+	squashfs_inode_cachep = kmem_cache_create("squashfs_inode_cache",
+	     sizeof(struct squashfs_inode_info),
+	     0, SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT,
+	     init_once, NULL);
+	if (squashfs_inode_cachep == NULL)
+		return -ENOMEM;
+	return 0;
+}
+
+
+static void destroy_inodecache(void)
+{
+	kmem_cache_destroy(squashfs_inode_cachep);
+}
+
+
+module_init(init_squashfs_fs);
+module_exit(exit_squashfs_fs);
+MODULE_DESCRIPTION("squashfs 3.2-r2, a compressed read-only filesystem");
+MODULE_AUTHOR("Phillip Lougher <phillip@lougher.org.uk>");
+MODULE_LICENSE("GPL");
diff --git a/fs/squashfs/squashfs.h b/fs/squashfs/squashfs.h
new file mode 100644
index 0000000..6f863f0
--- /dev/null
+++ b/fs/squashfs/squashfs.h
@@ -0,0 +1,87 @@
+/*
+ * Squashfs - a compressed read only filesystem for Linux
+ *
+ * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007
+ * Phillip Lougher <phillip@lougher.org.uk>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2,
+ * or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ * squashfs.h
+ */
+
+#ifdef CONFIG_SQUASHFS_1_0_COMPATIBILITY
+#undef CONFIG_SQUASHFS_1_0_COMPATIBILITY
+#endif
+
+#ifdef SQUASHFS_TRACE
+#define TRACE(s, args...)	printk(KERN_NOTICE "SQUASHFS: "s, ## args)
+#else
+#define TRACE(s, args...)	{}
+#endif
+
+#define ERROR(s, args...)	printk(KERN_ERR "SQUASHFS error: "s, ## args)
+
+#define SERROR(s, args...)	do { \
+				if (!silent) \
+				printk(KERN_ERR "SQUASHFS error: "s, ## args);\
+				} while(0)
+
+#define WARNING(s, args...)	printk(KERN_WARNING "SQUASHFS: "s, ## args)
+
+static inline struct squashfs_inode_info *SQUASHFS_I(struct inode *inode)
+{
+	return list_entry(inode, struct squashfs_inode_info, vfs_inode);
+}
+
+#if defined(CONFIG_SQUASHFS_1_0_COMPATIBILITY ) || defined(CONFIG_SQUASHFS_2_0_COMPATIBILITY)
+#define SQSH_EXTERN
+extern unsigned int squashfs_read_data(struct super_block *s, char *buffer,
+				long long index, unsigned int length,
+				long long *next_index, int srclength);
+extern int squashfs_get_cached_block(struct super_block *s, char *buffer,
+				long long block, unsigned int offset,
+				int length, long long *next_block,
+				unsigned int *next_offset);
+extern void release_cached_fragment(struct squashfs_sb_info *msblk, struct
+					squashfs_fragment_cache *fragment);
+extern struct squashfs_fragment_cache *get_cached_fragment(struct super_block
+					*s, long long start_block,
+					int length);
+extern struct inode *squashfs_iget(struct super_block *s, squashfs_inode_t inode, unsigned int inode_number);
+extern const struct address_space_operations squashfs_symlink_aops;
+extern const struct address_space_operations squashfs_aops;
+extern const struct address_space_operations squashfs_aops_4K;
+extern struct inode_operations squashfs_dir_inode_ops;
+#else
+#define SQSH_EXTERN static
+#endif
+
+#ifdef CONFIG_SQUASHFS_1_0_COMPATIBILITY
+extern int squashfs_1_0_supported(struct squashfs_sb_info *msblk);
+#else
+static inline int squashfs_1_0_supported(struct squashfs_sb_info *msblk)
+{
+	return 0;
+}
+#endif
+
+#ifdef CONFIG_SQUASHFS_2_0_COMPATIBILITY
+extern int squashfs_2_0_supported(struct squashfs_sb_info *msblk);
+#else
+static inline int squashfs_2_0_supported(struct squashfs_sb_info *msblk)
+{
+	return 0;
+}
+#endif
diff --git a/fs/squashfs/squashfs2_0.c b/fs/squashfs/squashfs2_0.c
new file mode 100644
index 0000000..d8d9d55
--- /dev/null
+++ b/fs/squashfs/squashfs2_0.c
@@ -0,0 +1,742 @@
+/*
+ * Squashfs - a compressed read only filesystem for Linux
+ *
+ * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007
+ * Phillip Lougher <phillip@lougher.org.uk>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2,
+ * or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ * squashfs2_0.c
+ */
+
+#include <linux/squashfs_fs.h>
+#include <linux/module.h>
+#include <linux/zlib.h>
+#include <linux/fs.h>
+#include <linux/squashfs_fs_sb.h>
+#include <linux/squashfs_fs_i.h>
+
+#include "squashfs.h"
+static int squashfs_readdir_2(struct file *file, void *dirent, filldir_t filldir);
+static struct dentry *squashfs_lookup_2(struct inode *, struct dentry *,
+				struct nameidata *);
+
+static struct file_operations squashfs_dir_ops_2 = {
+	.read = generic_read_dir,
+	.readdir = squashfs_readdir_2
+};
+
+static struct inode_operations squashfs_dir_inode_ops_2 = {
+	.lookup = squashfs_lookup_2
+};
+
+static unsigned char squashfs_filetype_table[] = {
+	DT_UNKNOWN, DT_DIR, DT_REG, DT_LNK, DT_BLK, DT_CHR, DT_FIFO, DT_SOCK
+};
+
+static int read_fragment_index_table_2(struct super_block *s)
+{
+	struct squashfs_sb_info *msblk = s->s_fs_info;
+	struct squashfs_super_block *sblk = &msblk->sblk;
+
+	if (!(msblk->fragment_index_2 = kmalloc(SQUASHFS_FRAGMENT_INDEX_BYTES_2
+					(sblk->fragments), GFP_KERNEL))) {
+		ERROR("Failed to allocate uid/gid table\n");
+		return 0;
+	}
+   
+	if (SQUASHFS_FRAGMENT_INDEX_BYTES_2(sblk->fragments) &&
+					!squashfs_read_data(s, (char *)
+					msblk->fragment_index_2,
+					sblk->fragment_table_start,
+					SQUASHFS_FRAGMENT_INDEX_BYTES_2
+					(sblk->fragments) |
+					SQUASHFS_COMPRESSED_BIT_BLOCK, NULL, SQUASHFS_FRAGMENT_INDEX_BYTES_2(sblk->fragments))) {
+		ERROR("unable to read fragment index table\n");
+		return 0;
+	}
+
+	if (msblk->swap) {
+		int i;
+		unsigned int fragment;
+
+		for (i = 0; i < SQUASHFS_FRAGMENT_INDEXES_2(sblk->fragments);
+									i++) {
+			SQUASHFS_SWAP_FRAGMENT_INDEXES_2((&fragment),
+						&msblk->fragment_index_2[i], 1);
+			msblk->fragment_index_2[i] = fragment;
+		}
+	}
+
+	return 1;
+}
+
+
+static int get_fragment_location_2(struct super_block *s, unsigned int fragment,
+				long long *fragment_start_block,
+				unsigned int *fragment_size)
+{
+	struct squashfs_sb_info *msblk = s->s_fs_info;
+	long long start_block =
+		msblk->fragment_index_2[SQUASHFS_FRAGMENT_INDEX_2(fragment)];
+	int offset = SQUASHFS_FRAGMENT_INDEX_OFFSET_2(fragment);
+	struct squashfs_fragment_entry_2 fragment_entry;
+
+	if (msblk->swap) {
+		struct squashfs_fragment_entry_2 sfragment_entry;
+
+		if (!squashfs_get_cached_block(s, (char *) &sfragment_entry,
+					start_block, offset,
+					sizeof(sfragment_entry), &start_block,
+					&offset))
+			goto out;
+		SQUASHFS_SWAP_FRAGMENT_ENTRY_2(&fragment_entry, &sfragment_entry);
+	} else
+		if (!squashfs_get_cached_block(s, (char *) &fragment_entry,
+					start_block, offset,
+					sizeof(fragment_entry), &start_block,
+					&offset))
+			goto out;
+
+	*fragment_start_block = fragment_entry.start_block;
+	*fragment_size = fragment_entry.size;
+
+	return 1;
+
+out:
+	return 0;
+}
+
+
+static void squashfs_new_inode(struct squashfs_sb_info *msblk, struct inode *i,
+		struct squashfs_base_inode_header_2 *inodeb, unsigned int ino)
+{
+	struct squashfs_super_block *sblk = &msblk->sblk;
+
+	i->i_ino = ino;
+	i->i_mtime.tv_sec = sblk->mkfs_time;
+	i->i_atime.tv_sec = sblk->mkfs_time;
+	i->i_ctime.tv_sec = sblk->mkfs_time;
+	i->i_uid = msblk->uid[inodeb->uid];
+	i->i_mode = inodeb->mode;
+	i->i_nlink = 1;
+	i->i_size = 0;
+	if (inodeb->guid == SQUASHFS_GUIDS)
+		i->i_gid = i->i_uid;
+	else
+		i->i_gid = msblk->guid[inodeb->guid];
+}
+
+
+static int squashfs_read_inode_2(struct inode *i, squashfs_inode_t inode)
+{
+	struct super_block *s = i->i_sb;
+	struct squashfs_sb_info *msblk = s->s_fs_info;
+	struct squashfs_super_block *sblk = &msblk->sblk;
+	unsigned int block = SQUASHFS_INODE_BLK(inode) +
+		sblk->inode_table_start;
+	unsigned int offset = SQUASHFS_INODE_OFFSET(inode);
+	unsigned int ino = i->i_ino;
+	long long next_block;
+	unsigned int next_offset;
+	union squashfs_inode_header_2 id, sid;
+	struct squashfs_base_inode_header_2 *inodeb = &id.base,
+					  *sinodeb = &sid.base;
+
+	TRACE("Entered squashfs_iget\n");
+
+	if (msblk->swap) {
+		if (!squashfs_get_cached_block(s, (char *) sinodeb, block,
+					offset, sizeof(*sinodeb), &next_block,
+					&next_offset))
+			goto failed_read;
+		SQUASHFS_SWAP_BASE_INODE_HEADER_2(inodeb, sinodeb,
+					sizeof(*sinodeb));
+	} else
+		if (!squashfs_get_cached_block(s, (char *) inodeb, block,
+					offset, sizeof(*inodeb), &next_block,
+					&next_offset))
+			goto failed_read;
+
+	squashfs_new_inode(msblk, i, inodeb, ino);
+
+	switch(inodeb->inode_type) {
+		case SQUASHFS_FILE_TYPE: {
+			struct squashfs_reg_inode_header_2 *inodep = &id.reg;
+			struct squashfs_reg_inode_header_2 *sinodep = &sid.reg;
+			long long frag_blk;
+			unsigned int frag_size = 0;
+				
+			if (msblk->swap) {
+				if (!squashfs_get_cached_block(s, (char *)
+						sinodep, block, offset,
+						sizeof(*sinodep), &next_block,
+						&next_offset))
+					goto failed_read;
+				SQUASHFS_SWAP_REG_INODE_HEADER_2(inodep, sinodep);
+			} else
+				if (!squashfs_get_cached_block(s, (char *)
+						inodep, block, offset,
+						sizeof(*inodep), &next_block,
+						&next_offset))
+					goto failed_read;
+
+			frag_blk = SQUASHFS_INVALID_BLK;
+			if (inodep->fragment != SQUASHFS_INVALID_FRAG &&
+					!get_fragment_location_2(s,
+					inodep->fragment, &frag_blk, &frag_size))
+				goto failed_read;
+				
+			i->i_size = inodep->file_size;
+			i->i_fop = &generic_ro_fops;
+			i->i_mode |= S_IFREG;
+			i->i_mtime.tv_sec = inodep->mtime;
+			i->i_atime.tv_sec = inodep->mtime;
+			i->i_ctime.tv_sec = inodep->mtime;
+			i->i_blocks = ((i->i_size - 1) >> 9) + 1;
+			SQUASHFS_I(i)->u.s1.fragment_start_block = frag_blk;
+			SQUASHFS_I(i)->u.s1.fragment_size = frag_size;
+			SQUASHFS_I(i)->u.s1.fragment_offset = inodep->offset;
+			SQUASHFS_I(i)->start_block = inodep->start_block;
+			SQUASHFS_I(i)->u.s1.block_list_start = next_block;
+			SQUASHFS_I(i)->offset = next_offset;
+			if (sblk->block_size > 4096)
+				i->i_data.a_ops = &squashfs_aops;
+			else
+				i->i_data.a_ops = &squashfs_aops_4K;
+
+			TRACE("File inode %x:%x, start_block %x, "
+					"block_list_start %llx, offset %x\n",
+					SQUASHFS_INODE_BLK(inode), offset,
+					inodep->start_block, next_block,
+					next_offset);
+			break;
+		}
+		case SQUASHFS_DIR_TYPE: {
+			struct squashfs_dir_inode_header_2 *inodep = &id.dir;
+			struct squashfs_dir_inode_header_2 *sinodep = &sid.dir;
+
+			if (msblk->swap) {
+				if (!squashfs_get_cached_block(s, (char *)
+						sinodep, block, offset,
+						sizeof(*sinodep), &next_block,
+						&next_offset))
+					goto failed_read;
+				SQUASHFS_SWAP_DIR_INODE_HEADER_2(inodep, sinodep);
+			} else
+				if (!squashfs_get_cached_block(s, (char *)
+						inodep, block, offset,
+						sizeof(*inodep), &next_block,
+						&next_offset))
+					goto failed_read;
+
+			i->i_size = inodep->file_size;
+			i->i_op = &squashfs_dir_inode_ops_2;
+			i->i_fop = &squashfs_dir_ops_2;
+			i->i_mode |= S_IFDIR;
+			i->i_mtime.tv_sec = inodep->mtime;
+			i->i_atime.tv_sec = inodep->mtime;
+			i->i_ctime.tv_sec = inodep->mtime;
+			SQUASHFS_I(i)->start_block = inodep->start_block;
+			SQUASHFS_I(i)->offset = inodep->offset;
+			SQUASHFS_I(i)->u.s2.directory_index_count = 0;
+			SQUASHFS_I(i)->u.s2.parent_inode = 0;
+
+			TRACE("Directory inode %x:%x, start_block %x, offset "
+					"%x\n", SQUASHFS_INODE_BLK(inode),
+					offset, inodep->start_block,
+					inodep->offset);
+			break;
+		}
+		case SQUASHFS_LDIR_TYPE: {
+			struct squashfs_ldir_inode_header_2 *inodep = &id.ldir;
+			struct squashfs_ldir_inode_header_2 *sinodep = &sid.ldir;
+
+			if (msblk->swap) {
+				if (!squashfs_get_cached_block(s, (char *)
+						sinodep, block, offset,
+						sizeof(*sinodep), &next_block,
+						&next_offset))
+					goto failed_read;
+				SQUASHFS_SWAP_LDIR_INODE_HEADER_2(inodep,
+						sinodep);
+			} else
+				if (!squashfs_get_cached_block(s, (char *)
+						inodep, block, offset,
+						sizeof(*inodep), &next_block,
+						&next_offset))
+					goto failed_read;
+
+			i->i_size = inodep->file_size;
+			i->i_op = &squashfs_dir_inode_ops_2;
+			i->i_fop = &squashfs_dir_ops_2;
+			i->i_mode |= S_IFDIR;
+			i->i_mtime.tv_sec = inodep->mtime;
+			i->i_atime.tv_sec = inodep->mtime;
+			i->i_ctime.tv_sec = inodep->mtime;
+			SQUASHFS_I(i)->start_block = inodep->start_block;
+			SQUASHFS_I(i)->offset = inodep->offset;
+			SQUASHFS_I(i)->u.s2.directory_index_start = next_block;
+			SQUASHFS_I(i)->u.s2.directory_index_offset =
+								next_offset;
+			SQUASHFS_I(i)->u.s2.directory_index_count =
+								inodep->i_count;
+			SQUASHFS_I(i)->u.s2.parent_inode = 0;
+
+			TRACE("Long directory inode %x:%x, start_block %x, "
+					"offset %x\n",
+					SQUASHFS_INODE_BLK(inode), offset,
+					inodep->start_block, inodep->offset);
+			break;
+		}
+		case SQUASHFS_SYMLINK_TYPE: {
+			struct squashfs_symlink_inode_header_2 *inodep =
+								&id.symlink;
+			struct squashfs_symlink_inode_header_2 *sinodep =
+								&sid.symlink;
+	
+			if (msblk->swap) {
+				if (!squashfs_get_cached_block(s, (char *)
+						sinodep, block, offset,
+						sizeof(*sinodep), &next_block,
+						&next_offset))
+					goto failed_read;
+				SQUASHFS_SWAP_SYMLINK_INODE_HEADER_2(inodep,
+								sinodep);
+			} else
+				if (!squashfs_get_cached_block(s, (char *)
+						inodep, block, offset,
+						sizeof(*inodep), &next_block,
+						&next_offset))
+					goto failed_read;
+
+			i->i_size = inodep->symlink_size;
+			i->i_op = &page_symlink_inode_operations;
+			i->i_data.a_ops = &squashfs_symlink_aops;
+			i->i_mode |= S_IFLNK;
+			SQUASHFS_I(i)->start_block = next_block;
+			SQUASHFS_I(i)->offset = next_offset;
+
+			TRACE("Symbolic link inode %x:%x, start_block %llx, "
+					"offset %x\n",
+					SQUASHFS_INODE_BLK(inode), offset,
+					next_block, next_offset);
+			break;
+		 }
+		 case SQUASHFS_BLKDEV_TYPE:
+		 case SQUASHFS_CHRDEV_TYPE: {
+			struct squashfs_dev_inode_header_2 *inodep = &id.dev;
+			struct squashfs_dev_inode_header_2 *sinodep = &sid.dev;
+
+			if (msblk->swap) {
+				if (!squashfs_get_cached_block(s, (char *)
+						sinodep, block, offset,
+						sizeof(*sinodep), &next_block,
+						&next_offset))
+					goto failed_read;
+				SQUASHFS_SWAP_DEV_INODE_HEADER_2(inodep, sinodep);
+			} else	
+				if (!squashfs_get_cached_block(s, (char *)
+						inodep, block, offset,
+						sizeof(*inodep), &next_block,
+						&next_offset))
+					goto failed_read;
+
+			i->i_mode |= (inodeb->inode_type ==
+					SQUASHFS_CHRDEV_TYPE) ?  S_IFCHR :
+					S_IFBLK;
+			init_special_inode(i, i->i_mode,
+					old_decode_dev(inodep->rdev));
+
+			TRACE("Device inode %x:%x, rdev %x\n",
+					SQUASHFS_INODE_BLK(inode), offset,
+					inodep->rdev);
+			break;
+		 }
+		 case SQUASHFS_FIFO_TYPE:
+		 case SQUASHFS_SOCKET_TYPE: {
+
+			i->i_mode |= (inodeb->inode_type == SQUASHFS_FIFO_TYPE)
+							? S_IFIFO : S_IFSOCK;
+			init_special_inode(i, i->i_mode, 0);
+			break;
+		 }
+		 default:
+			ERROR("Unknown inode type %d in squashfs_iget!\n",
+					inodeb->inode_type);
+			goto failed_read1;
+	}
+	
+	return 1;
+
+failed_read:
+	ERROR("Unable to read inode [%x:%x]\n", block, offset);
+
+failed_read1:
+	return 0;
+}
+
+
+static int get_dir_index_using_offset(struct super_block *s, long long 
+				*next_block, unsigned int *next_offset,
+				long long index_start,
+				unsigned int index_offset, int i_count,
+				long long f_pos)
+{
+	struct squashfs_sb_info *msblk = s->s_fs_info;
+	struct squashfs_super_block *sblk = &msblk->sblk;
+	int i, length = 0;
+	struct squashfs_dir_index_2 index;
+
+	TRACE("Entered get_dir_index_using_offset, i_count %d, f_pos %d\n",
+					i_count, (unsigned int) f_pos);
+
+	if (f_pos == 0)
+		goto finish;
+
+	for (i = 0; i < i_count; i++) {
+		if (msblk->swap) {
+			struct squashfs_dir_index_2 sindex;
+			squashfs_get_cached_block(s, (char *) &sindex,
+					index_start, index_offset,
+					sizeof(sindex), &index_start,
+					&index_offset);
+			SQUASHFS_SWAP_DIR_INDEX_2(&index, &sindex);
+		} else
+			squashfs_get_cached_block(s, (char *) &index,
+					index_start, index_offset,
+					sizeof(index), &index_start,
+					&index_offset);
+
+		if (index.index > f_pos)
+			break;
+
+		squashfs_get_cached_block(s, NULL, index_start, index_offset,
+					index.size + 1, &index_start,
+					&index_offset);
+
+		length = index.index;
+		*next_block = index.start_block + sblk->directory_table_start;
+	}
+
+	*next_offset = (length + *next_offset) % SQUASHFS_METADATA_SIZE;
+
+finish:
+	return length;
+}
+
+
+static int get_dir_index_using_name(struct super_block *s, long long
+				*next_block, unsigned int *next_offset,
+				long long index_start,
+				unsigned int index_offset, int i_count,
+				const char *name, int size)
+{
+	struct squashfs_sb_info *msblk = s->s_fs_info;
+	struct squashfs_super_block *sblk = &msblk->sblk;
+	int i, length = 0;
+	struct squashfs_dir_index_2 *index;
+	char *str;
+
+	TRACE("Entered get_dir_index_using_name, i_count %d\n", i_count);
+
+	if (!(str = kmalloc(sizeof(struct squashfs_dir_index) +
+		(SQUASHFS_NAME_LEN + 1) * 2, GFP_KERNEL))) {
+		ERROR("Failed to allocate squashfs_dir_index\n");
+		goto failure;
+	}
+
+	index = (struct squashfs_dir_index_2 *) (str + SQUASHFS_NAME_LEN + 1);
+	strncpy(str, name, size);
+	str[size] = '\0';
+
+	for (i = 0; i < i_count; i++) {
+		if (msblk->swap) {
+			struct squashfs_dir_index_2 sindex;
+			squashfs_get_cached_block(s, (char *) &sindex,
+					index_start, index_offset,
+					sizeof(sindex), &index_start,
+					&index_offset);
+			SQUASHFS_SWAP_DIR_INDEX_2(index, &sindex);
+		} else
+			squashfs_get_cached_block(s, (char *) index,
+					index_start, index_offset,
+					sizeof(struct squashfs_dir_index_2),
+					&index_start, &index_offset);
+
+		squashfs_get_cached_block(s, index->name, index_start,
+					index_offset, index->size + 1,
+					&index_start, &index_offset);
+
+		index->name[index->size + 1] = '\0';
+
+		if (strcmp(index->name, str) > 0)
+			break;
+
+		length = index->index;
+		*next_block = index->start_block + sblk->directory_table_start;
+	}
+
+	*next_offset = (length + *next_offset) % SQUASHFS_METADATA_SIZE;
+	kfree(str);
+failure:
+	return length;
+}
+
+		
+static int squashfs_readdir_2(struct file *file, void *dirent, filldir_t filldir)
+{
+	struct inode *i = file->f_dentry->d_inode;
+	struct squashfs_sb_info *msblk = i->i_sb->s_fs_info;
+	struct squashfs_super_block *sblk = &msblk->sblk;
+	long long next_block = SQUASHFS_I(i)->start_block +
+		sblk->directory_table_start;
+	int next_offset = SQUASHFS_I(i)->offset, length = 0,
+		dir_count;
+	struct squashfs_dir_header_2 dirh;
+	struct squashfs_dir_entry_2 *dire;
+
+	TRACE("Entered squashfs_readdir_2 [%llx:%x]\n", next_block, next_offset);
+
+	if (!(dire = kmalloc(sizeof(struct squashfs_dir_entry) +
+		SQUASHFS_NAME_LEN + 1, GFP_KERNEL))) {
+		ERROR("Failed to allocate squashfs_dir_entry\n");
+		goto finish;
+	}
+
+	length = get_dir_index_using_offset(i->i_sb, &next_block, &next_offset,
+				SQUASHFS_I(i)->u.s2.directory_index_start,
+				SQUASHFS_I(i)->u.s2.directory_index_offset,
+				SQUASHFS_I(i)->u.s2.directory_index_count,
+				file->f_pos);
+
+	while (length < i_size_read(i)) {
+		/* read directory header */
+		if (msblk->swap) {
+			struct squashfs_dir_header_2 sdirh;
+			
+			if (!squashfs_get_cached_block(i->i_sb, (char *) &sdirh,
+					next_block, next_offset, sizeof(sdirh),
+					&next_block, &next_offset))
+				goto failed_read;
+
+			length += sizeof(sdirh);
+			SQUASHFS_SWAP_DIR_HEADER_2(&dirh, &sdirh);
+		} else {
+			if (!squashfs_get_cached_block(i->i_sb, (char *) &dirh,
+					next_block, next_offset, sizeof(dirh),
+					&next_block, &next_offset))
+				goto failed_read;
+
+			length += sizeof(dirh);
+		}
+
+		dir_count = dirh.count + 1;
+		while (dir_count--) {
+			if (msblk->swap) {
+				struct squashfs_dir_entry_2 sdire;
+				if (!squashfs_get_cached_block(i->i_sb, (char *)
+						&sdire, next_block, next_offset,
+						sizeof(sdire), &next_block,
+						&next_offset))
+					goto failed_read;
+				
+				length += sizeof(sdire);
+				SQUASHFS_SWAP_DIR_ENTRY_2(dire, &sdire);
+			} else {
+				if (!squashfs_get_cached_block(i->i_sb, (char *)
+						dire, next_block, next_offset,
+						sizeof(*dire), &next_block,
+						&next_offset))
+					goto failed_read;
+
+				length += sizeof(*dire);
+			}
+
+			if (!squashfs_get_cached_block(i->i_sb, dire->name,
+						next_block, next_offset,
+						dire->size + 1, &next_block,
+						&next_offset))
+				goto failed_read;
+
+			length += dire->size + 1;
+
+			if (file->f_pos >= length)
+				continue;
+
+			dire->name[dire->size + 1] = '\0';
+
+			TRACE("Calling filldir(%x, %s, %d, %d, %x:%x, %d)\n",
+					(unsigned int) dirent, dire->name,
+					dire->size + 1, (int) file->f_pos,
+					dirh.start_block, dire->offset,
+					squashfs_filetype_table[dire->type]);
+
+			if (filldir(dirent, dire->name, dire->size + 1,
+					file->f_pos, SQUASHFS_MK_VFS_INODE(
+					dirh.start_block, dire->offset),
+					squashfs_filetype_table[dire->type])
+					< 0) {
+				TRACE("Filldir returned less than 0\n");
+				goto finish;
+			}
+			file->f_pos = length;
+		}
+	}
+
+finish:
+	kfree(dire);
+	return 0;
+
+failed_read:
+	ERROR("Unable to read directory block [%llx:%x]\n", next_block,
+		next_offset);
+	kfree(dire);
+	return 0;
+}
+
+
+static struct dentry *squashfs_lookup_2(struct inode *i, struct dentry *dentry,
+				struct nameidata *nd)
+{
+	const unsigned char *name = dentry->d_name.name;
+	int len = dentry->d_name.len;
+	struct inode *inode = NULL;
+	struct squashfs_sb_info *msblk = i->i_sb->s_fs_info;
+	struct squashfs_super_block *sblk = &msblk->sblk;
+	long long next_block = SQUASHFS_I(i)->start_block +
+				sblk->directory_table_start;
+	int next_offset = SQUASHFS_I(i)->offset, length = 0,
+				dir_count;
+	struct squashfs_dir_header_2 dirh;
+	struct squashfs_dir_entry_2 *dire;
+	int sorted = sblk->s_major == 2 && sblk->s_minor >= 1;
+
+	TRACE("Entered squashfs_lookup_2 [%llx:%x]\n", next_block, next_offset);
+
+	if (!(dire = kmalloc(sizeof(struct squashfs_dir_entry) +
+		SQUASHFS_NAME_LEN + 1, GFP_KERNEL))) {
+		ERROR("Failed to allocate squashfs_dir_entry\n");
+		goto exit_loop;
+	}
+
+	if (len > SQUASHFS_NAME_LEN)
+		goto exit_loop;
+
+	length = get_dir_index_using_name(i->i_sb, &next_block, &next_offset,
+				SQUASHFS_I(i)->u.s2.directory_index_start,
+				SQUASHFS_I(i)->u.s2.directory_index_offset,
+				SQUASHFS_I(i)->u.s2.directory_index_count, name,
+				len);
+
+	while (length < i_size_read(i)) {
+		/* read directory header */
+		if (msblk->swap) {
+			struct squashfs_dir_header_2 sdirh;
+			if (!squashfs_get_cached_block(i->i_sb, (char *) &sdirh,
+					next_block, next_offset, sizeof(sdirh),
+					&next_block, &next_offset))
+				goto failed_read;
+
+			length += sizeof(sdirh);
+			SQUASHFS_SWAP_DIR_HEADER_2(&dirh, &sdirh);
+		} else {
+			if (!squashfs_get_cached_block(i->i_sb, (char *) &dirh,
+					next_block, next_offset, sizeof(dirh),
+					&next_block, &next_offset))
+				goto failed_read;
+
+			length += sizeof(dirh);
+		}
+
+		dir_count = dirh.count + 1;
+		while (dir_count--) {
+			if (msblk->swap) {
+				struct squashfs_dir_entry_2 sdire;
+				if (!squashfs_get_cached_block(i->i_sb, (char *)
+						&sdire, next_block,next_offset,
+						sizeof(sdire), &next_block,
+						&next_offset))
+					goto failed_read;
+				
+				length += sizeof(sdire);
+				SQUASHFS_SWAP_DIR_ENTRY_2(dire, &sdire);
+			} else {
+				if (!squashfs_get_cached_block(i->i_sb, (char *)
+						dire, next_block,next_offset,
+						sizeof(*dire), &next_block,
+						&next_offset))
+					goto failed_read;
+
+				length += sizeof(*dire);
+			}
+
+			if (!squashfs_get_cached_block(i->i_sb, dire->name,
+					next_block, next_offset, dire->size + 1,
+					&next_block, &next_offset))
+				goto failed_read;
+
+			length += dire->size + 1;
+
+			if (sorted && name[0] < dire->name[0])
+				goto exit_loop;
+
+			if ((len == dire->size + 1) && !strncmp(name,
+						dire->name, len)) {
+				squashfs_inode_t ino =
+					SQUASHFS_MKINODE(dirh.start_block,
+					dire->offset);
+				unsigned int inode_number = SQUASHFS_MK_VFS_INODE(dirh.start_block,
+					dire->offset);
+
+				TRACE("calling squashfs_iget for directory "
+					"entry %s, inode %x:%x, %lld\n", name,
+					dirh.start_block, dire->offset, ino);
+
+				inode = squashfs_iget(i->i_sb, ino, inode_number);
+
+				goto exit_loop;
+			}
+		}
+	}
+
+exit_loop:
+	kfree(dire);
+	d_add(dentry, inode);
+	return ERR_PTR(0);
+
+failed_read:
+	ERROR("Unable to read directory block [%llx:%x]\n", next_block,
+		next_offset);
+	goto exit_loop;
+}
+
+
+int squashfs_2_0_supported(struct squashfs_sb_info *msblk)
+{
+	struct squashfs_super_block *sblk = &msblk->sblk;
+
+	msblk->read_inode = squashfs_read_inode_2;
+	msblk->read_fragment_index_table = read_fragment_index_table_2;
+
+	sblk->bytes_used = sblk->bytes_used_2;
+	sblk->uid_start = sblk->uid_start_2;
+	sblk->guid_start = sblk->guid_start_2;
+	sblk->inode_table_start = sblk->inode_table_start_2;
+	sblk->directory_table_start = sblk->directory_table_start_2;
+	sblk->fragment_table_start = sblk->fragment_table_start_2;
+
+	return 1;
+}
diff --git a/include/linux/aufs_type.h b/include/linux/aufs_type.h
new file mode 100755
index 0000000..8b4629e
--- /dev/null
+++ b/include/linux/aufs_type.h
@@ -0,0 +1,97 @@
+/*
+ * Copyright (C) 2005, 2006, 2007 Junjiro Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+/* $Id: aufs_type.h,v 1.55 2007/05/14 03:40:57 sfjro Exp $ */
+
+#include <linux/ioctl.h>
+
+#ifndef __AUFS_TYPE_H__
+#define __AUFS_TYPE_H__
+
+#define AUFS_VERSION	"20070514"
+
+/* ---------------------------------------------------------------------- */
+
+#ifdef CONFIG_AUFS_BRANCH_MAX_127
+typedef char aufs_bindex_t;
+#define AUFS_BRANCH_MAX 127
+#else
+typedef short aufs_bindex_t;
+#ifdef CONFIG_AUFS_BRANCH_MAX_511
+#define AUFS_BRANCH_MAX 511
+#elif defined(CONFIG_AUFS_BRANCH_MAX_1023)
+#define AUFS_BRANCH_MAX 1023
+#elif defined(CONFIG_AUFS_BRANCH_MAX_32767)
+#define AUFS_BRANCH_MAX 32767
+#else
+#error unknown CONFIG_AUFS_BRANCH_MAX value
+#endif
+#endif
+
+#define AUFS_NAME		"aufs"
+#define AUFS_FSTYPE		AUFS_NAME
+
+#define AUFS_ROOT_INO		2
+#define AUFS_FIRST_INO		11
+
+#define AUFS_WH_PFX		".wh."
+#define AUFS_WH_PFX_LEN		((int)sizeof(AUFS_WH_PFX) - 1)
+#define AUFS_XINO_FNAME		"." AUFS_NAME ".xino"
+#define AUFS_XINO_DEFPATH	"/tmp/" AUFS_XINO_FNAME
+#define AUFS_DIRWH_DEF		3
+#define AUFS_RDCACHE_DEF	10 /* seconds */
+#define AUFS_WKQ_NAME		AUFS_NAME "d"
+#define AUFS_NWKQ_DEF		4
+
+#ifdef CONFIG_AUFS_COMPAT
+#define AUFS_DIROPQ_NAME	"__dir_opaque"
+#else
+#define AUFS_DIROPQ_NAME	AUFS_WH_PFX ".opq" /* whiteouted doubly */
+#endif
+#define AUFS_WH_DIROPQ		AUFS_WH_PFX AUFS_DIROPQ_NAME
+
+/* will be whiteouted doubly */
+#define AUFS_WH_BASENAME	AUFS_WH_PFX AUFS_NAME
+#define AUFS_WH_PLINKDIR	AUFS_WH_PFX "plink"
+
+/* ---------------------------------------------------------------------- */
+
+/* ioctl */
+enum {AuCtlErr, AuCtlErr_Last};
+enum {
+	AuCtl_REFRESH, //AuCtl_REFRESHV,
+	//AuCtl_FLUSH_PLINK,
+	//AuCtl_CPUP,
+	AuCtl_CPDOWN, AuCtl_MVDOWN
+};
+
+struct aufs_ctl_cp {
+	int bsrc, bdst;
+	int err;
+};
+
+#define Type			'A'
+#define AUFS_CTL_REFRESH	_IO(Type, AuCtl_REFRESH)
+//#define AUFS_CTL_REFRESHV	_IO(Type, AuCtl_REFRESHV)
+//#define AUFS_CTL_FLUSH_PLINK	_IOR(Type, AuCtl_FLUSH_PLINK)
+//#define AUFS_CTL_CPUP		_IOWR(Type, AuCtl_CPUP, struct aufs_ctl_cp)
+#define AUFS_CTL_CPDOWN		_IOWR(Type, AuCtl_CPDOWN, struct aufs_ctl_cp)
+#define AUFS_CTL_MVDOWN		_IOWR(Type, AuCtl_MVDOWN, struct aufs_ctl_cp)
+#undef Type
+
+#endif /* __AUFS_TYPE_H__ */
diff --git a/include/linux/squashfs_fs.h b/include/linux/squashfs_fs.h
new file mode 100644
index 0000000..a9380ad
--- /dev/null
+++ b/include/linux/squashfs_fs.h
@@ -0,0 +1,934 @@
+#ifndef SQUASHFS_FS
+#define SQUASHFS_FS
+
+/*
+ * Squashfs
+ *
+ * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007
+ * Phillip Lougher <phillip@lougher.org.uk>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2,
+ * or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ * squashfs_fs.h
+ */
+
+#ifndef CONFIG_SQUASHFS_2_0_COMPATIBILITY
+#define CONFIG_SQUASHFS_2_0_COMPATIBILITY
+#endif
+
+#ifdef	CONFIG_SQUASHFS_VMALLOC
+#define SQUASHFS_ALLOC(a)		vmalloc(a)
+#define SQUASHFS_FREE(a)		vfree(a)
+#else
+#define SQUASHFS_ALLOC(a)		kmalloc(a, GFP_KERNEL)
+#define SQUASHFS_FREE(a)		kfree(a)
+#endif
+#define SQUASHFS_CACHED_FRAGMENTS	CONFIG_SQUASHFS_FRAGMENT_CACHE_SIZE	
+#define SQUASHFS_MAJOR			3
+#define SQUASHFS_MINOR			0
+#define SQUASHFS_MAGIC			0x73717368
+#define SQUASHFS_MAGIC_SWAP		0x68737173
+#define SQUASHFS_START			0
+
+/* size of metadata (inode and directory) blocks */
+#define SQUASHFS_METADATA_SIZE		8192
+#define SQUASHFS_METADATA_LOG		13
+
+/* default size of data blocks */
+#define SQUASHFS_FILE_SIZE		65536
+#define SQUASHFS_FILE_LOG		16
+
+#define SQUASHFS_FILE_MAX_SIZE		65536
+
+/* Max number of uids and gids */
+#define SQUASHFS_UIDS			256
+#define SQUASHFS_GUIDS			255
+
+/* Max length of filename (not 255) */
+#define SQUASHFS_NAME_LEN		256
+
+#define SQUASHFS_INVALID		((long long) 0xffffffffffff)
+#define SQUASHFS_INVALID_FRAG		((unsigned int) 0xffffffff)
+#define SQUASHFS_INVALID_BLK		((long long) -1)
+#define SQUASHFS_USED_BLK		((long long) -2)
+
+/* Filesystem flags */
+#define SQUASHFS_NOI			0
+#define SQUASHFS_NOD			1
+#define SQUASHFS_CHECK			2
+#define SQUASHFS_NOF			3
+#define SQUASHFS_NO_FRAG		4
+#define SQUASHFS_ALWAYS_FRAG		5
+#define SQUASHFS_DUPLICATE		6
+#define SQUASHFS_EXPORT			7
+
+#define SQUASHFS_BIT(flag, bit)		((flag >> bit) & 1)
+
+#define SQUASHFS_UNCOMPRESSED_INODES(flags)	SQUASHFS_BIT(flags, \
+						SQUASHFS_NOI)
+
+#define SQUASHFS_UNCOMPRESSED_DATA(flags)	SQUASHFS_BIT(flags, \
+						SQUASHFS_NOD)
+
+#define SQUASHFS_UNCOMPRESSED_FRAGMENTS(flags)	SQUASHFS_BIT(flags, \
+						SQUASHFS_NOF)
+
+#define SQUASHFS_NO_FRAGMENTS(flags)		SQUASHFS_BIT(flags, \
+						SQUASHFS_NO_FRAG)
+
+#define SQUASHFS_ALWAYS_FRAGMENTS(flags)	SQUASHFS_BIT(flags, \
+						SQUASHFS_ALWAYS_FRAG)
+
+#define SQUASHFS_DUPLICATES(flags)		SQUASHFS_BIT(flags, \
+						SQUASHFS_DUPLICATE)
+
+#define SQUASHFS_EXPORTABLE(flags)		SQUASHFS_BIT(flags, \
+						SQUASHFS_EXPORT)
+
+#define SQUASHFS_CHECK_DATA(flags)		SQUASHFS_BIT(flags, \
+						SQUASHFS_CHECK)
+
+#define SQUASHFS_MKFLAGS(noi, nod, check_data, nof, no_frag, always_frag, \
+		duplicate_checking, exortable)	(noi | (nod << 1) | (check_data << 2) \
+		| (nof << 3) | (no_frag << 4) | (always_frag << 5) | \
+		(duplicate_checking << 6) | (exportable << 7))
+
+/* Max number of types and file types */
+#define SQUASHFS_DIR_TYPE		1
+#define SQUASHFS_FILE_TYPE		2
+#define SQUASHFS_SYMLINK_TYPE		3
+#define SQUASHFS_BLKDEV_TYPE		4
+#define SQUASHFS_CHRDEV_TYPE		5
+#define SQUASHFS_FIFO_TYPE		6
+#define SQUASHFS_SOCKET_TYPE		7
+#define SQUASHFS_LDIR_TYPE		8
+#define SQUASHFS_LREG_TYPE		9
+
+/* 1.0 filesystem type definitions */
+#define SQUASHFS_TYPES			5
+#define SQUASHFS_IPC_TYPE		0
+
+/* Flag whether block is compressed or uncompressed, bit is set if block is
+ * uncompressed */
+#define SQUASHFS_COMPRESSED_BIT		(1 << 15)
+
+#define SQUASHFS_COMPRESSED_SIZE(B)	(((B) & ~SQUASHFS_COMPRESSED_BIT) ? \
+		(B) & ~SQUASHFS_COMPRESSED_BIT :  SQUASHFS_COMPRESSED_BIT)
+
+#define SQUASHFS_COMPRESSED(B)		(!((B) & SQUASHFS_COMPRESSED_BIT))
+
+#define SQUASHFS_COMPRESSED_BIT_BLOCK		(1 << 24)
+
+#define SQUASHFS_COMPRESSED_SIZE_BLOCK(B)	(((B) & \
+	~SQUASHFS_COMPRESSED_BIT_BLOCK) ? (B) & \
+	~SQUASHFS_COMPRESSED_BIT_BLOCK : SQUASHFS_COMPRESSED_BIT_BLOCK)
+
+#define SQUASHFS_COMPRESSED_BLOCK(B)	(!((B) & SQUASHFS_COMPRESSED_BIT_BLOCK))
+
+/*
+ * Inode number ops.  Inodes consist of a compressed block number, and an
+ * uncompressed  offset within that block
+ */
+#define SQUASHFS_INODE_BLK(a)		((unsigned int) ((a) >> 16))
+
+#define SQUASHFS_INODE_OFFSET(a)	((unsigned int) ((a) & 0xffff))
+
+#define SQUASHFS_MKINODE(A, B)		((squashfs_inode_t)(((squashfs_inode_t) (A)\
+					<< 16) + (B)))
+
+/* Compute 32 bit VFS inode number from squashfs inode number */
+#define SQUASHFS_MK_VFS_INODE(a, b)	((unsigned int) (((a) << 8) + \
+					((b) >> 2) + 1))
+/* XXX */
+
+/* Translate between VFS mode and squashfs mode */
+#define SQUASHFS_MODE(a)		((a) & 0xfff)
+
+/* fragment and fragment table defines */
+#define SQUASHFS_FRAGMENT_BYTES(A)	((A) * sizeof(struct squashfs_fragment_entry))
+
+#define SQUASHFS_FRAGMENT_INDEX(A)	(SQUASHFS_FRAGMENT_BYTES(A) / \
+					SQUASHFS_METADATA_SIZE)
+
+#define SQUASHFS_FRAGMENT_INDEX_OFFSET(A)	(SQUASHFS_FRAGMENT_BYTES(A) % \
+						SQUASHFS_METADATA_SIZE)
+
+#define SQUASHFS_FRAGMENT_INDEXES(A)	((SQUASHFS_FRAGMENT_BYTES(A) + \
+					SQUASHFS_METADATA_SIZE - 1) / \
+					SQUASHFS_METADATA_SIZE)
+
+#define SQUASHFS_FRAGMENT_INDEX_BYTES(A)	(SQUASHFS_FRAGMENT_INDEXES(A) *\
+						sizeof(long long))
+
+/* inode lookup table defines */
+#define SQUASHFS_LOOKUP_BYTES(A)	((A) * sizeof(squashfs_inode_t))
+
+#define SQUASHFS_LOOKUP_BLOCK(A)		(SQUASHFS_LOOKUP_BYTES(A) / \
+						SQUASHFS_METADATA_SIZE)
+
+#define SQUASHFS_LOOKUP_BLOCK_OFFSET(A)		(SQUASHFS_LOOKUP_BYTES(A) % \
+						SQUASHFS_METADATA_SIZE)
+
+#define SQUASHFS_LOOKUP_BLOCKS(A)	((SQUASHFS_LOOKUP_BYTES(A) + \
+					SQUASHFS_METADATA_SIZE - 1) / \
+					SQUASHFS_METADATA_SIZE)
+
+#define SQUASHFS_LOOKUP_BLOCK_BYTES(A)	(SQUASHFS_LOOKUP_BLOCKS(A) *\
+					sizeof(long long))
+
+/* cached data constants for filesystem */
+#define SQUASHFS_CACHED_BLKS		8
+
+#define SQUASHFS_MAX_FILE_SIZE_LOG	64
+
+#define SQUASHFS_MAX_FILE_SIZE		((long long) 1 << \
+					(SQUASHFS_MAX_FILE_SIZE_LOG - 2))
+
+#define SQUASHFS_MARKER_BYTE		0xff
+
+/* meta index cache */
+#define SQUASHFS_META_INDEXES	(SQUASHFS_METADATA_SIZE / sizeof(unsigned int))
+#define SQUASHFS_META_ENTRIES	31
+#define SQUASHFS_META_NUMBER	8
+#define SQUASHFS_SLOTS		4
+
+struct meta_entry {
+	long long		data_block;
+	unsigned int		index_block;
+	unsigned short		offset;
+	unsigned short		pad;
+};
+
+struct meta_index {
+	unsigned int		inode_number;
+	unsigned int		offset;
+	unsigned short		entries;
+	unsigned short		skip;
+	unsigned short		locked;
+	unsigned short		pad;
+	struct meta_entry	meta_entry[SQUASHFS_META_ENTRIES];
+};
+
+
+/*
+ * definitions for structures on disk
+ */
+
+typedef long long		squashfs_block_t;
+typedef long long		squashfs_inode_t;
+
+struct squashfs_super_block {
+	unsigned int		s_magic;
+	unsigned int		inodes;
+	unsigned int		bytes_used_2;
+	unsigned int		uid_start_2;
+	unsigned int		guid_start_2;
+	unsigned int		inode_table_start_2;
+	unsigned int		directory_table_start_2;
+	unsigned int		s_major:16;
+	unsigned int		s_minor:16;
+	unsigned int		block_size_1:16;
+	unsigned int		block_log:16;
+	unsigned int		flags:8;
+	unsigned int		no_uids:8;
+	unsigned int		no_guids:8;
+	unsigned int		mkfs_time /* time of filesystem creation */;
+	squashfs_inode_t	root_inode;
+	unsigned int		block_size;
+	unsigned int		fragments;
+	unsigned int		fragment_table_start_2;
+	long long		bytes_used;
+	long long		uid_start;
+	long long		guid_start;
+	long long		inode_table_start;
+	long long		directory_table_start;
+	long long		fragment_table_start;
+	long long		lookup_table_start;
+} __attribute__ ((packed));
+
+struct squashfs_dir_index {
+	unsigned int		index;
+	unsigned int		start_block;
+	unsigned char		size;
+	unsigned char		name[0];
+} __attribute__ ((packed));
+
+#define SQUASHFS_BASE_INODE_HEADER		\
+	unsigned int		inode_type:4;	\
+	unsigned int		mode:12;	\
+	unsigned int		uid:8;		\
+	unsigned int		guid:8;		\
+	unsigned int		mtime;		\
+	unsigned int 		inode_number;
+
+struct squashfs_base_inode_header {
+	SQUASHFS_BASE_INODE_HEADER;
+} __attribute__ ((packed));
+
+struct squashfs_ipc_inode_header {
+	SQUASHFS_BASE_INODE_HEADER;
+	unsigned int		nlink;
+} __attribute__ ((packed));
+
+struct squashfs_dev_inode_header {
+	SQUASHFS_BASE_INODE_HEADER;
+	unsigned int		nlink;
+	unsigned short		rdev;
+} __attribute__ ((packed));
+	
+struct squashfs_symlink_inode_header {
+	SQUASHFS_BASE_INODE_HEADER;
+	unsigned int		nlink;
+	unsigned short		symlink_size;
+	char			symlink[0];
+} __attribute__ ((packed));
+
+struct squashfs_reg_inode_header {
+	SQUASHFS_BASE_INODE_HEADER;
+	squashfs_block_t	start_block;
+	unsigned int		fragment;
+	unsigned int		offset;
+	unsigned int		file_size;
+	unsigned short		block_list[0];
+} __attribute__ ((packed));
+
+struct squashfs_lreg_inode_header {
+	SQUASHFS_BASE_INODE_HEADER;
+	unsigned int		nlink;
+	squashfs_block_t	start_block;
+	unsigned int		fragment;
+	unsigned int		offset;
+	long long		file_size;
+	unsigned short		block_list[0];
+} __attribute__ ((packed));
+
+struct squashfs_dir_inode_header {
+	SQUASHFS_BASE_INODE_HEADER;
+	unsigned int		nlink;
+	unsigned int		file_size:19;
+	unsigned int		offset:13;
+	unsigned int		start_block;
+	unsigned int		parent_inode;
+} __attribute__  ((packed));
+
+struct squashfs_ldir_inode_header {
+	SQUASHFS_BASE_INODE_HEADER;
+	unsigned int		nlink;
+	unsigned int		file_size:27;
+	unsigned int		offset:13;
+	unsigned int		start_block;
+	unsigned int		i_count:16;
+	unsigned int		parent_inode;
+	struct squashfs_dir_index	index[0];
+} __attribute__  ((packed));
+
+union squashfs_inode_header {
+	struct squashfs_base_inode_header	base;
+	struct squashfs_dev_inode_header	dev;
+	struct squashfs_symlink_inode_header	symlink;
+	struct squashfs_reg_inode_header	reg;
+	struct squashfs_lreg_inode_header	lreg;
+	struct squashfs_dir_inode_header	dir;
+	struct squashfs_ldir_inode_header	ldir;
+	struct squashfs_ipc_inode_header	ipc;
+};
+	
+struct squashfs_dir_entry {
+	unsigned int		offset:13;
+	unsigned int		type:3;
+	unsigned int		size:8;
+	int			inode_number:16;
+	char			name[0];
+} __attribute__ ((packed));
+
+struct squashfs_dir_header {
+	unsigned int		count:8;
+	unsigned int		start_block;
+	unsigned int		inode_number;
+} __attribute__ ((packed));
+
+struct squashfs_fragment_entry {
+	long long		start_block;
+	unsigned int		size;
+	unsigned int		pending;
+} __attribute__ ((packed));
+
+extern int squashfs_uncompress_block(void *d, int dstlen, void *s, int srclen);
+extern int squashfs_uncompress_init(void);
+extern int squashfs_uncompress_exit(void);
+
+/*
+ * macros to convert each packed bitfield structure from little endian to big
+ * endian and vice versa.  These are needed when creating or using a filesystem
+ * on a machine with different byte ordering to the target architecture.
+ *
+ */
+
+#define SQUASHFS_SWAP_START \
+	int bits;\
+	int b_pos;\
+	unsigned long long val;\
+	unsigned char *s;\
+	unsigned char *d;
+
+#define SQUASHFS_SWAP_SUPER_BLOCK(s, d) {\
+	SQUASHFS_SWAP_START\
+	SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_super_block));\
+	SQUASHFS_SWAP((s)->s_magic, d, 0, 32);\
+	SQUASHFS_SWAP((s)->inodes, d, 32, 32);\
+	SQUASHFS_SWAP((s)->bytes_used_2, d, 64, 32);\
+	SQUASHFS_SWAP((s)->uid_start_2, d, 96, 32);\
+	SQUASHFS_SWAP((s)->guid_start_2, d, 128, 32);\
+	SQUASHFS_SWAP((s)->inode_table_start_2, d, 160, 32);\
+	SQUASHFS_SWAP((s)->directory_table_start_2, d, 192, 32);\
+	SQUASHFS_SWAP((s)->s_major, d, 224, 16);\
+	SQUASHFS_SWAP((s)->s_minor, d, 240, 16);\
+	SQUASHFS_SWAP((s)->block_size_1, d, 256, 16);\
+	SQUASHFS_SWAP((s)->block_log, d, 272, 16);\
+	SQUASHFS_SWAP((s)->flags, d, 288, 8);\
+	SQUASHFS_SWAP((s)->no_uids, d, 296, 8);\
+	SQUASHFS_SWAP((s)->no_guids, d, 304, 8);\
+	SQUASHFS_SWAP((s)->mkfs_time, d, 312, 32);\
+	SQUASHFS_SWAP((s)->root_inode, d, 344, 64);\
+	SQUASHFS_SWAP((s)->block_size, d, 408, 32);\
+	SQUASHFS_SWAP((s)->fragments, d, 440, 32);\
+	SQUASHFS_SWAP((s)->fragment_table_start_2, d, 472, 32);\
+	SQUASHFS_SWAP((s)->bytes_used, d, 504, 64);\
+	SQUASHFS_SWAP((s)->uid_start, d, 568, 64);\
+	SQUASHFS_SWAP((s)->guid_start, d, 632, 64);\
+	SQUASHFS_SWAP((s)->inode_table_start, d, 696, 64);\
+	SQUASHFS_SWAP((s)->directory_table_start, d, 760, 64);\
+	SQUASHFS_SWAP((s)->fragment_table_start, d, 824, 64);\
+	SQUASHFS_SWAP((s)->lookup_table_start, d, 888, 64);\
+}
+
+#define SQUASHFS_SWAP_BASE_INODE_CORE(s, d, n)\
+	SQUASHFS_MEMSET(s, d, n);\
+	SQUASHFS_SWAP((s)->inode_type, d, 0, 4);\
+	SQUASHFS_SWAP((s)->mode, d, 4, 12);\
+	SQUASHFS_SWAP((s)->uid, d, 16, 8);\
+	SQUASHFS_SWAP((s)->guid, d, 24, 8);\
+	SQUASHFS_SWAP((s)->mtime, d, 32, 32);\
+	SQUASHFS_SWAP((s)->inode_number, d, 64, 32);
+
+#define SQUASHFS_SWAP_BASE_INODE_HEADER(s, d, n) {\
+	SQUASHFS_SWAP_START\
+	SQUASHFS_SWAP_BASE_INODE_CORE(s, d, n)\
+}
+
+#define SQUASHFS_SWAP_IPC_INODE_HEADER(s, d) {\
+	SQUASHFS_SWAP_START\
+	SQUASHFS_SWAP_BASE_INODE_CORE(s, d, \
+			sizeof(struct squashfs_ipc_inode_header))\
+	SQUASHFS_SWAP((s)->nlink, d, 96, 32);\
+}
+
+#define SQUASHFS_SWAP_DEV_INODE_HEADER(s, d) {\
+	SQUASHFS_SWAP_START\
+	SQUASHFS_SWAP_BASE_INODE_CORE(s, d, \
+			sizeof(struct squashfs_dev_inode_header)); \
+	SQUASHFS_SWAP((s)->nlink, d, 96, 32);\
+	SQUASHFS_SWAP((s)->rdev, d, 128, 16);\
+}
+
+#define SQUASHFS_SWAP_SYMLINK_INODE_HEADER(s, d) {\
+	SQUASHFS_SWAP_START\
+	SQUASHFS_SWAP_BASE_INODE_CORE(s, d, \
+			sizeof(struct squashfs_symlink_inode_header));\
+	SQUASHFS_SWAP((s)->nlink, d, 96, 32);\
+	SQUASHFS_SWAP((s)->symlink_size, d, 128, 16);\
+}
+
+#define SQUASHFS_SWAP_REG_INODE_HEADER(s, d) {\
+	SQUASHFS_SWAP_START\
+	SQUASHFS_SWAP_BASE_INODE_CORE(s, d, \
+			sizeof(struct squashfs_reg_inode_header));\
+	SQUASHFS_SWAP((s)->start_block, d, 96, 64);\
+	SQUASHFS_SWAP((s)->fragment, d, 160, 32);\
+	SQUASHFS_SWAP((s)->offset, d, 192, 32);\
+	SQUASHFS_SWAP((s)->file_size, d, 224, 32);\
+}
+
+#define SQUASHFS_SWAP_LREG_INODE_HEADER(s, d) {\
+	SQUASHFS_SWAP_START\
+	SQUASHFS_SWAP_BASE_INODE_CORE(s, d, \
+			sizeof(struct squashfs_lreg_inode_header));\
+	SQUASHFS_SWAP((s)->nlink, d, 96, 32);\
+	SQUASHFS_SWAP((s)->start_block, d, 128, 64);\
+	SQUASHFS_SWAP((s)->fragment, d, 192, 32);\
+	SQUASHFS_SWAP((s)->offset, d, 224, 32);\
+	SQUASHFS_SWAP((s)->file_size, d, 256, 64);\
+}
+
+#define SQUASHFS_SWAP_DIR_INODE_HEADER(s, d) {\
+	SQUASHFS_SWAP_START\
+	SQUASHFS_SWAP_BASE_INODE_CORE(s, d, \
+			sizeof(struct squashfs_dir_inode_header));\
+	SQUASHFS_SWAP((s)->nlink, d, 96, 32);\
+	SQUASHFS_SWAP((s)->file_size, d, 128, 19);\
+	SQUASHFS_SWAP((s)->offset, d, 147, 13);\
+	SQUASHFS_SWAP((s)->start_block, d, 160, 32);\
+	SQUASHFS_SWAP((s)->parent_inode, d, 192, 32);\
+}
+
+#define SQUASHFS_SWAP_LDIR_INODE_HEADER(s, d) {\
+	SQUASHFS_SWAP_START\
+	SQUASHFS_SWAP_BASE_INODE_CORE(s, d, \
+			sizeof(struct squashfs_ldir_inode_header));\
+	SQUASHFS_SWAP((s)->nlink, d, 96, 32);\
+	SQUASHFS_SWAP((s)->file_size, d, 128, 27);\
+	SQUASHFS_SWAP((s)->offset, d, 155, 13);\
+	SQUASHFS_SWAP((s)->start_block, d, 168, 32);\
+	SQUASHFS_SWAP((s)->i_count, d, 200, 16);\
+	SQUASHFS_SWAP((s)->parent_inode, d, 216, 32);\
+}
+
+#define SQUASHFS_SWAP_DIR_INDEX(s, d) {\
+	SQUASHFS_SWAP_START\
+	SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_dir_index));\
+	SQUASHFS_SWAP((s)->index, d, 0, 32);\
+	SQUASHFS_SWAP((s)->start_block, d, 32, 32);\
+	SQUASHFS_SWAP((s)->size, d, 64, 8);\
+}
+
+#define SQUASHFS_SWAP_DIR_HEADER(s, d) {\
+	SQUASHFS_SWAP_START\
+	SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_dir_header));\
+	SQUASHFS_SWAP((s)->count, d, 0, 8);\
+	SQUASHFS_SWAP((s)->start_block, d, 8, 32);\
+	SQUASHFS_SWAP((s)->inode_number, d, 40, 32);\
+}
+
+#define SQUASHFS_SWAP_DIR_ENTRY(s, d) {\
+	SQUASHFS_SWAP_START\
+	SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_dir_entry));\
+	SQUASHFS_SWAP((s)->offset, d, 0, 13);\
+	SQUASHFS_SWAP((s)->type, d, 13, 3);\
+	SQUASHFS_SWAP((s)->size, d, 16, 8);\
+	SQUASHFS_SWAP((s)->inode_number, d, 24, 16);\
+}
+
+#define SQUASHFS_SWAP_FRAGMENT_ENTRY(s, d) {\
+	SQUASHFS_SWAP_START\
+	SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_fragment_entry));\
+	SQUASHFS_SWAP((s)->start_block, d, 0, 64);\
+	SQUASHFS_SWAP((s)->size, d, 64, 32);\
+}
+
+#define SQUASHFS_SWAP_INODE_T(s, d) SQUASHFS_SWAP_LONG_LONGS(s, d, 1)
+
+#define SQUASHFS_SWAP_SHORTS(s, d, n) {\
+	int entry;\
+	int bit_position;\
+	SQUASHFS_SWAP_START\
+	SQUASHFS_MEMSET(s, d, n * 2);\
+	for(entry = 0, bit_position = 0; entry < n; entry++, bit_position += \
+			16)\
+		SQUASHFS_SWAP(s[entry], d, bit_position, 16);\
+}
+
+#define SQUASHFS_SWAP_INTS(s, d, n) {\
+	int entry;\
+	int bit_position;\
+	SQUASHFS_SWAP_START\
+	SQUASHFS_MEMSET(s, d, n * 4);\
+	for(entry = 0, bit_position = 0; entry < n; entry++, bit_position += \
+			32)\
+		SQUASHFS_SWAP(s[entry], d, bit_position, 32);\
+}
+
+#define SQUASHFS_SWAP_LONG_LONGS(s, d, n) {\
+	int entry;\
+	int bit_position;\
+	SQUASHFS_SWAP_START\
+	SQUASHFS_MEMSET(s, d, n * 8);\
+	for(entry = 0, bit_position = 0; entry < n; entry++, bit_position += \
+			64)\
+		SQUASHFS_SWAP(s[entry], d, bit_position, 64);\
+}
+
+#define SQUASHFS_SWAP_DATA(s, d, n, bits) {\
+	int entry;\
+	int bit_position;\
+	SQUASHFS_SWAP_START\
+	SQUASHFS_MEMSET(s, d, n * bits / 8);\
+	for(entry = 0, bit_position = 0; entry < n; entry++, bit_position += \
+			bits)\
+		SQUASHFS_SWAP(s[entry], d, bit_position, bits);\
+}
+
+#define SQUASHFS_SWAP_FRAGMENT_INDEXES(s, d, n) SQUASHFS_SWAP_LONG_LONGS(s, d, n)
+#define SQUASHFS_SWAP_LOOKUP_BLOCKS(s, d, n) SQUASHFS_SWAP_LONG_LONGS(s, d, n)
+
+#ifdef CONFIG_SQUASHFS_1_0_COMPATIBILITY
+
+struct squashfs_base_inode_header_1 {
+	unsigned int		inode_type:4;
+	unsigned int		mode:12; /* protection */
+	unsigned int		uid:4; /* index into uid table */
+	unsigned int		guid:4; /* index into guid table */
+} __attribute__ ((packed));
+
+struct squashfs_ipc_inode_header_1 {
+	unsigned int		inode_type:4;
+	unsigned int		mode:12; /* protection */
+	unsigned int		uid:4; /* index into uid table */
+	unsigned int		guid:4; /* index into guid table */
+	unsigned int		type:4;
+	unsigned int		offset:4;
+} __attribute__ ((packed));
+
+struct squashfs_dev_inode_header_1 {
+	unsigned int		inode_type:4;
+	unsigned int		mode:12; /* protection */
+	unsigned int		uid:4; /* index into uid table */
+	unsigned int		guid:4; /* index into guid table */
+	unsigned short		rdev;
+} __attribute__ ((packed));
+	
+struct squashfs_symlink_inode_header_1 {
+	unsigned int		inode_type:4;
+	unsigned int		mode:12; /* protection */
+	unsigned int		uid:4; /* index into uid table */
+	unsigned int		guid:4; /* index into guid table */
+	unsigned short		symlink_size;
+	char			symlink[0];
+} __attribute__ ((packed));
+
+struct squashfs_reg_inode_header_1 {
+	unsigned int		inode_type:4;
+	unsigned int		mode:12; /* protection */
+	unsigned int		uid:4; /* index into uid table */
+	unsigned int		guid:4; /* index into guid table */
+	unsigned int		mtime;
+	unsigned int		start_block;
+	unsigned int		file_size:32;
+	unsigned short		block_list[0];
+} __attribute__ ((packed));
+
+struct squashfs_dir_inode_header_1 {
+	unsigned int		inode_type:4;
+	unsigned int		mode:12; /* protection */
+	unsigned int		uid:4; /* index into uid table */
+	unsigned int		guid:4; /* index into guid table */
+	unsigned int		file_size:19;
+	unsigned int		offset:13;
+	unsigned int		mtime;
+	unsigned int		start_block:24;
+} __attribute__  ((packed));
+
+#define SQUASHFS_SWAP_BASE_INODE_CORE_1(s, d, n) \
+	SQUASHFS_MEMSET(s, d, n);\
+	SQUASHFS_SWAP((s)->inode_type, d, 0, 4);\
+	SQUASHFS_SWAP((s)->mode, d, 4, 12);\
+	SQUASHFS_SWAP((s)->uid, d, 16, 4);\
+	SQUASHFS_SWAP((s)->guid, d, 20, 4);
+
+#define SQUASHFS_SWAP_BASE_INODE_HEADER_1(s, d, n) {\
+	SQUASHFS_SWAP_START\
+	SQUASHFS_SWAP_BASE_INODE_CORE_1(s, d, n)\
+}
+
+#define SQUASHFS_SWAP_IPC_INODE_HEADER_1(s, d) {\
+	SQUASHFS_SWAP_START\
+	SQUASHFS_SWAP_BASE_INODE_CORE_1(s, d, \
+			sizeof(struct squashfs_ipc_inode_header_1));\
+	SQUASHFS_SWAP((s)->type, d, 24, 4);\
+	SQUASHFS_SWAP((s)->offset, d, 28, 4);\
+}
+
+#define SQUASHFS_SWAP_DEV_INODE_HEADER_1(s, d) {\
+	SQUASHFS_SWAP_START\
+	SQUASHFS_SWAP_BASE_INODE_CORE_1(s, d, \
+			sizeof(struct squashfs_dev_inode_header_1));\
+	SQUASHFS_SWAP((s)->rdev, d, 24, 16);\
+}
+
+#define SQUASHFS_SWAP_SYMLINK_INODE_HEADER_1(s, d) {\
+	SQUASHFS_SWAP_START\
+	SQUASHFS_SWAP_BASE_INODE_CORE_1(s, d, \
+			sizeof(struct squashfs_symlink_inode_header_1));\
+	SQUASHFS_SWAP((s)->symlink_size, d, 24, 16);\
+}
+
+#define SQUASHFS_SWAP_REG_INODE_HEADER_1(s, d) {\
+	SQUASHFS_SWAP_START\
+	SQUASHFS_SWAP_BASE_INODE_CORE_1(s, d, \
+			sizeof(struct squashfs_reg_inode_header_1));\
+	SQUASHFS_SWAP((s)->mtime, d, 24, 32);\
+	SQUASHFS_SWAP((s)->start_block, d, 56, 32);\
+	SQUASHFS_SWAP((s)->file_size, d, 88, 32);\
+}
+
+#define SQUASHFS_SWAP_DIR_INODE_HEADER_1(s, d) {\
+	SQUASHFS_SWAP_START\
+	SQUASHFS_SWAP_BASE_INODE_CORE_1(s, d, \
+			sizeof(struct squashfs_dir_inode_header_1));\
+	SQUASHFS_SWAP((s)->file_size, d, 24, 19);\
+	SQUASHFS_SWAP((s)->offset, d, 43, 13);\
+	SQUASHFS_SWAP((s)->mtime, d, 56, 32);\
+	SQUASHFS_SWAP((s)->start_block, d, 88, 24);\
+}
+
+#endif
+
+#ifdef CONFIG_SQUASHFS_2_0_COMPATIBILITY
+
+struct squashfs_dir_index_2 {
+	unsigned int		index:27;
+	unsigned int		start_block:29;
+	unsigned char		size;
+	unsigned char		name[0];
+} __attribute__ ((packed));
+
+struct squashfs_base_inode_header_2 {
+	unsigned int		inode_type:4;
+	unsigned int		mode:12; /* protection */
+	unsigned int		uid:8; /* index into uid table */
+	unsigned int		guid:8; /* index into guid table */
+} __attribute__ ((packed));
+
+struct squashfs_ipc_inode_header_2 {
+	unsigned int		inode_type:4;
+	unsigned int		mode:12; /* protection */
+	unsigned int		uid:8; /* index into uid table */
+	unsigned int		guid:8; /* index into guid table */
+} __attribute__ ((packed));
+
+struct squashfs_dev_inode_header_2 {
+	unsigned int		inode_type:4;
+	unsigned int		mode:12; /* protection */
+	unsigned int		uid:8; /* index into uid table */
+	unsigned int		guid:8; /* index into guid table */
+	unsigned short		rdev;
+} __attribute__ ((packed));
+	
+struct squashfs_symlink_inode_header_2 {
+	unsigned int		inode_type:4;
+	unsigned int		mode:12; /* protection */
+	unsigned int		uid:8; /* index into uid table */
+	unsigned int		guid:8; /* index into guid table */
+	unsigned short		symlink_size;
+	char			symlink[0];
+} __attribute__ ((packed));
+
+struct squashfs_reg_inode_header_2 {
+	unsigned int		inode_type:4;
+	unsigned int		mode:12; /* protection */
+	unsigned int		uid:8; /* index into uid table */
+	unsigned int		guid:8; /* index into guid table */
+	unsigned int		mtime;
+	unsigned int		start_block;
+	unsigned int		fragment;
+	unsigned int		offset;
+	unsigned int		file_size:32;
+	unsigned short		block_list[0];
+} __attribute__ ((packed));
+
+struct squashfs_dir_inode_header_2 {
+	unsigned int		inode_type:4;
+	unsigned int		mode:12; /* protection */
+	unsigned int		uid:8; /* index into uid table */
+	unsigned int		guid:8; /* index into guid table */
+	unsigned int		file_size:19;
+	unsigned int		offset:13;
+	unsigned int		mtime;
+	unsigned int		start_block:24;
+} __attribute__  ((packed));
+
+struct squashfs_ldir_inode_header_2 {
+	unsigned int		inode_type:4;
+	unsigned int		mode:12; /* protection */
+	unsigned int		uid:8; /* index into uid table */
+	unsigned int		guid:8; /* index into guid table */
+	unsigned int		file_size:27;
+	unsigned int		offset:13;
+	unsigned int		mtime;
+	unsigned int		start_block:24;
+	unsigned int		i_count:16;
+	struct squashfs_dir_index_2	index[0];
+} __attribute__  ((packed));
+
+union squashfs_inode_header_2 {
+	struct squashfs_base_inode_header_2	base;
+	struct squashfs_dev_inode_header_2	dev;
+	struct squashfs_symlink_inode_header_2	symlink;
+	struct squashfs_reg_inode_header_2	reg;
+	struct squashfs_dir_inode_header_2	dir;
+	struct squashfs_ldir_inode_header_2	ldir;
+	struct squashfs_ipc_inode_header_2	ipc;
+};
+	
+struct squashfs_dir_header_2 {
+	unsigned int		count:8;
+	unsigned int		start_block:24;
+} __attribute__ ((packed));
+
+struct squashfs_dir_entry_2 {
+	unsigned int		offset:13;
+	unsigned int		type:3;
+	unsigned int		size:8;
+	char			name[0];
+} __attribute__ ((packed));
+
+struct squashfs_fragment_entry_2 {
+	unsigned int		start_block;
+	unsigned int		size;
+} __attribute__ ((packed));
+
+#define SQUASHFS_SWAP_BASE_INODE_CORE_2(s, d, n)\
+	SQUASHFS_MEMSET(s, d, n);\
+	SQUASHFS_SWAP((s)->inode_type, d, 0, 4);\
+	SQUASHFS_SWAP((s)->mode, d, 4, 12);\
+	SQUASHFS_SWAP((s)->uid, d, 16, 8);\
+	SQUASHFS_SWAP((s)->guid, d, 24, 8);\
+
+#define SQUASHFS_SWAP_BASE_INODE_HEADER_2(s, d, n) {\
+	SQUASHFS_SWAP_START\
+	SQUASHFS_SWAP_BASE_INODE_CORE_2(s, d, n)\
+}
+
+#define SQUASHFS_SWAP_IPC_INODE_HEADER_2(s, d) \
+	SQUASHFS_SWAP_BASE_INODE_HEADER_2(s, d, sizeof(struct squashfs_ipc_inode_header_2))
+
+#define SQUASHFS_SWAP_DEV_INODE_HEADER_2(s, d) {\
+	SQUASHFS_SWAP_START\
+	SQUASHFS_SWAP_BASE_INODE_CORE_2(s, d, \
+			sizeof(struct squashfs_dev_inode_header_2)); \
+	SQUASHFS_SWAP((s)->rdev, d, 32, 16);\
+}
+
+#define SQUASHFS_SWAP_SYMLINK_INODE_HEADER_2(s, d) {\
+	SQUASHFS_SWAP_START\
+	SQUASHFS_SWAP_BASE_INODE_CORE_2(s, d, \
+			sizeof(struct squashfs_symlink_inode_header_2));\
+	SQUASHFS_SWAP((s)->symlink_size, d, 32, 16);\
+}
+
+#define SQUASHFS_SWAP_REG_INODE_HEADER_2(s, d) {\
+	SQUASHFS_SWAP_START\
+	SQUASHFS_SWAP_BASE_INODE_CORE_2(s, d, \
+			sizeof(struct squashfs_reg_inode_header_2));\
+	SQUASHFS_SWAP((s)->mtime, d, 32, 32);\
+	SQUASHFS_SWAP((s)->start_block, d, 64, 32);\
+	SQUASHFS_SWAP((s)->fragment, d, 96, 32);\
+	SQUASHFS_SWAP((s)->offset, d, 128, 32);\
+	SQUASHFS_SWAP((s)->file_size, d, 160, 32);\
+}
+
+#define SQUASHFS_SWAP_DIR_INODE_HEADER_2(s, d) {\
+	SQUASHFS_SWAP_START\
+	SQUASHFS_SWAP_BASE_INODE_CORE_2(s, d, \
+			sizeof(struct squashfs_dir_inode_header_2));\
+	SQUASHFS_SWAP((s)->file_size, d, 32, 19);\
+	SQUASHFS_SWAP((s)->offset, d, 51, 13);\
+	SQUASHFS_SWAP((s)->mtime, d, 64, 32);\
+	SQUASHFS_SWAP((s)->start_block, d, 96, 24);\
+}
+
+#define SQUASHFS_SWAP_LDIR_INODE_HEADER_2(s, d) {\
+	SQUASHFS_SWAP_START\
+	SQUASHFS_SWAP_BASE_INODE_CORE_2(s, d, \
+			sizeof(struct squashfs_ldir_inode_header_2));\
+	SQUASHFS_SWAP((s)->file_size, d, 32, 27);\
+	SQUASHFS_SWAP((s)->offset, d, 59, 13);\
+	SQUASHFS_SWAP((s)->mtime, d, 72, 32);\
+	SQUASHFS_SWAP((s)->start_block, d, 104, 24);\
+	SQUASHFS_SWAP((s)->i_count, d, 128, 16);\
+}
+
+#define SQUASHFS_SWAP_DIR_INDEX_2(s, d) {\
+	SQUASHFS_SWAP_START\
+	SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_dir_index_2));\
+	SQUASHFS_SWAP((s)->index, d, 0, 27);\
+	SQUASHFS_SWAP((s)->start_block, d, 27, 29);\
+	SQUASHFS_SWAP((s)->size, d, 56, 8);\
+}
+#define SQUASHFS_SWAP_DIR_HEADER_2(s, d) {\
+	SQUASHFS_SWAP_START\
+	SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_dir_header_2));\
+	SQUASHFS_SWAP((s)->count, d, 0, 8);\
+	SQUASHFS_SWAP((s)->start_block, d, 8, 24);\
+}
+
+#define SQUASHFS_SWAP_DIR_ENTRY_2(s, d) {\
+	SQUASHFS_SWAP_START\
+	SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_dir_entry_2));\
+	SQUASHFS_SWAP((s)->offset, d, 0, 13);\
+	SQUASHFS_SWAP((s)->type, d, 13, 3);\
+	SQUASHFS_SWAP((s)->size, d, 16, 8);\
+}
+
+#define SQUASHFS_SWAP_FRAGMENT_ENTRY_2(s, d) {\
+	SQUASHFS_SWAP_START\
+	SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_fragment_entry_2));\
+	SQUASHFS_SWAP((s)->start_block, d, 0, 32);\
+	SQUASHFS_SWAP((s)->size, d, 32, 32);\
+}
+
+#define SQUASHFS_SWAP_FRAGMENT_INDEXES_2(s, d, n) SQUASHFS_SWAP_INTS(s, d, n)
+
+/* fragment and fragment table defines */
+#define SQUASHFS_FRAGMENT_BYTES_2(A)	(A * sizeof(struct squashfs_fragment_entry_2))
+
+#define SQUASHFS_FRAGMENT_INDEX_2(A)	(SQUASHFS_FRAGMENT_BYTES_2(A) / \
+					SQUASHFS_METADATA_SIZE)
+
+#define SQUASHFS_FRAGMENT_INDEX_OFFSET_2(A)	(SQUASHFS_FRAGMENT_BYTES_2(A) % \
+						SQUASHFS_METADATA_SIZE)
+
+#define SQUASHFS_FRAGMENT_INDEXES_2(A)	((SQUASHFS_FRAGMENT_BYTES_2(A) + \
+					SQUASHFS_METADATA_SIZE - 1) / \
+					SQUASHFS_METADATA_SIZE)
+
+#define SQUASHFS_FRAGMENT_INDEX_BYTES_2(A)	(SQUASHFS_FRAGMENT_INDEXES_2(A) *\
+						sizeof(int))
+
+#endif
+
+#ifdef __KERNEL__
+
+/*
+ * macros used to swap each structure entry, taking into account
+ * bitfields and different bitfield placing conventions on differing
+ * architectures
+ */
+
+#include <asm/byteorder.h>
+
+#ifdef __BIG_ENDIAN
+	/* convert from little endian to big endian */
+#define SQUASHFS_SWAP(value, p, pos, tbits) _SQUASHFS_SWAP(value, p, pos, \
+		tbits, b_pos)
+#else
+	/* convert from big endian to little endian */ 
+#define SQUASHFS_SWAP(value, p, pos, tbits) _SQUASHFS_SWAP(value, p, pos, \
+		tbits, 64 - tbits - b_pos)
+#endif
+
+#define _SQUASHFS_SWAP(value, p, pos, tbits, SHIFT) {\
+	b_pos = pos % 8;\
+	val = 0;\
+	s = (unsigned char *)p + (pos / 8);\
+	d = ((unsigned char *) &val) + 7;\
+	for(bits = 0; bits < (tbits + b_pos); bits += 8) \
+		*d-- = *s++;\
+	value = (val >> (SHIFT))/* & ((1 << tbits) - 1)*/;\
+}
+
+#define SQUASHFS_MEMSET(s, d, n)	memset(s, 0, n);
+
+#endif
+#endif
diff --git a/include/linux/squashfs_fs_i.h b/include/linux/squashfs_fs_i.h
new file mode 100644
index 0000000..798891a
--- /dev/null
+++ b/include/linux/squashfs_fs_i.h
@@ -0,0 +1,45 @@
+#ifndef SQUASHFS_FS_I
+#define SQUASHFS_FS_I
+/*
+ * Squashfs
+ *
+ * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007
+ * Phillip Lougher <phillip@lougher.org.uk>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2,
+ * or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ * squashfs_fs_i.h
+ */
+
+struct squashfs_inode_info {
+	long long	start_block;
+	unsigned int	offset;
+	union {
+		struct {
+			long long	fragment_start_block;
+			unsigned int	fragment_size;
+			unsigned int	fragment_offset;
+			long long	block_list_start;
+		} s1;
+		struct {
+			long long	directory_index_start;
+			unsigned int	directory_index_offset;
+			unsigned int	directory_index_count;
+			unsigned int	parent_inode;
+		} s2;
+	} u;
+	struct inode	vfs_inode;
+};
+#endif
diff --git a/include/linux/squashfs_fs_sb.h b/include/linux/squashfs_fs_sb.h
new file mode 100644
index 0000000..8f3bf99
--- /dev/null
+++ b/include/linux/squashfs_fs_sb.h
@@ -0,0 +1,74 @@
+#ifndef SQUASHFS_FS_SB
+#define SQUASHFS_FS_SB
+/*
+ * Squashfs
+ *
+ * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007
+ * Phillip Lougher <phillip@lougher.org.uk>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2,
+ * or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ * squashfs_fs_sb.h
+ */
+
+#include <linux/squashfs_fs.h>
+
+struct squashfs_cache {
+	long long	block;
+	int		length;
+	long long	next_index;
+	char		*data;
+};
+
+struct squashfs_fragment_cache {
+	long long	block;
+	int		length;
+	unsigned int	locked;
+	char		*data;
+};
+
+struct squashfs_sb_info {
+	struct squashfs_super_block	sblk;
+	int			devblksize;
+	int			devblksize_log2;
+	int			swap;
+	struct squashfs_cache	*block_cache;
+	struct squashfs_fragment_cache	*fragment;
+	int			next_cache;
+	int			next_fragment;
+	int			next_meta_index;
+	unsigned int		*uid;
+	unsigned int		*guid;
+	long long		*fragment_index;
+	unsigned int		*fragment_index_2;
+	char			*read_page;
+	struct mutex		read_data_mutex;
+	struct mutex		read_page_mutex;
+	struct mutex		block_cache_mutex;
+	struct mutex		fragment_mutex;
+	struct mutex		meta_index_mutex;
+	wait_queue_head_t	waitq;
+	wait_queue_head_t	fragment_wait_queue;
+	struct meta_index	*meta_index;
+	z_stream		stream;
+	long long		*inode_lookup_table;
+	int			(*read_inode)(struct inode *i,  squashfs_inode_t \
+				inode);
+	long long		(*read_blocklist)(struct inode *inode, int \
+				index, int readahead_blks, char *block_list, \
+				unsigned short **block_p, unsigned int *bsize);
+	int			(*read_fragment_index_table)(struct super_block *s);
+};
+#endif
diff --git a/init/Kconfig b/init/Kconfig
index b170aa1..bcfc3b4 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -244,23 +244,21 @@ config AUDITSYSCALL
 	  ensure that INOTIFY is configured.
 
 config IKCONFIG
-	tristate "Kernel .config support"
+	tristate "Kernel .miniconfig support"
 	---help---
-	  This option enables the complete Linux kernel ".config" file
+	  This option enables the mini Linux kernel ".miniconfig" file
 	  contents to be saved in the kernel. It provides documentation
 	  of which kernel options are used in a running kernel or in an
-	  on-disk kernel.  This information can be extracted from the kernel
-	  image file with the script scripts/extract-ikconfig and used as
-	  input to rebuild the current kernel or to build another kernel.
-	  It can also be extracted from a running kernel by reading
-	  /proc/config.gz if enabled (below).
+	  on-disk kernel. 
+	  It can be extracted from a running kernel by reading
+	  /proc/miniconfig.gz if enabled (below).
 
 config IKCONFIG_PROC
-	bool "Enable access to .config through /proc/config.gz"
+	bool "Enable access to .miniconfig through /proc/miniconfig.gz"
 	depends on IKCONFIG && PROC_FS
 	---help---
 	  This option enables access to the kernel configuration file
-	  through /proc/config.gz.
+	  through /proc/miniconfig.gz.
 
 config CPUSETS
 	bool "Cpuset support"
diff --git a/init/LzmaDecode.c b/init/LzmaDecode.c
new file mode 100644
index 0000000..21bf40b
--- /dev/null
+++ b/init/LzmaDecode.c
@@ -0,0 +1,588 @@
+/*
+  LzmaDecode.c
+  LZMA Decoder (optimized for Speed version)
+  
+  LZMA SDK 4.22 Copyright (c) 1999-2005 Igor Pavlov (2005-06-10)
+  http://www.7-zip.org/
+
+  LZMA SDK is licensed under two licenses:
+  1) GNU Lesser General Public License (GNU LGPL)
+  2) Common Public License (CPL)
+  It means that you can select one of these two licenses and 
+  follow rules of that license.
+
+  SPECIAL EXCEPTION:
+  Igor Pavlov, as the author of this Code, expressly permits you to 
+  statically or dynamically link your Code (or bind by name) to the 
+  interfaces of this file without subjecting your linked Code to the 
+  terms of the CPL or GNU LGPL. Any modifications or additions 
+  to this file, however, are subject to the LGPL or CPL terms.
+*/
+
+#include "LzmaDecode.h"
+
+#ifndef Byte
+#define Byte unsigned char
+#endif
+
+#define kNumTopBits 24
+#define kTopValue ((UInt32)1 << kNumTopBits)
+
+#define kNumBitModelTotalBits 11
+#define kBitModelTotal (1 << kNumBitModelTotalBits)
+#define kNumMoveBits 5
+
+#define RC_READ_BYTE (*Buffer++)
+
+#define RC_INIT2 Code = 0; Range = 0xFFFFFFFF; \
+  { int i; for(i = 0; i < 5; i++) { RC_TEST; Code = (Code << 8) | RC_READ_BYTE; }}
+
+#ifdef _LZMA_IN_CB
+
+#define RC_TEST { if (Buffer == BufferLim) \
+  { SizeT size; int result = InCallback->Read(InCallback, &Buffer, &size); if (result != LZMA_RESULT_OK) return result; \
+  BufferLim = Buffer + size; if (size == 0) return LZMA_RESULT_DATA_ERROR; }}
+
+#define RC_INIT Buffer = BufferLim = 0; RC_INIT2
+
+#else
+
+#define RC_TEST { if (Buffer == BufferLim) return LZMA_RESULT_DATA_ERROR; }
+
+#define RC_INIT(buffer, bufferSize) Buffer = buffer; BufferLim = buffer + bufferSize; RC_INIT2
+ 
+#endif
+
+#define RC_NORMALIZE if (Range < kTopValue) { RC_TEST; Range <<= 8; Code = (Code << 8) | RC_READ_BYTE; }
+
+#define IfBit0(p) RC_NORMALIZE; bound = (Range >> kNumBitModelTotalBits) * *(p); if (Code < bound)
+#define UpdateBit0(p) Range = bound; *(p) += (kBitModelTotal - *(p)) >> kNumMoveBits;
+#define UpdateBit1(p) Range -= bound; Code -= bound; *(p) -= (*(p)) >> kNumMoveBits;
+
+#define RC_GET_BIT2(p, mi, A0, A1) IfBit0(p) \
+  { UpdateBit0(p); mi <<= 1; A0; } else \
+  { UpdateBit1(p); mi = (mi + mi) + 1; A1; } 
+  
+#define RC_GET_BIT(p, mi) RC_GET_BIT2(p, mi, ; , ;)               
+
+#define RangeDecoderBitTreeDecode(probs, numLevels, res) \
+  { int i = numLevels; res = 1; \
+  do { CProb *p = probs + res; RC_GET_BIT(p, res) } while(--i != 0); \
+  res -= (1 << numLevels); }
+
+
+#define kNumPosBitsMax 4
+#define kNumPosStatesMax (1 << kNumPosBitsMax)
+
+#define kLenNumLowBits 3
+#define kLenNumLowSymbols (1 << kLenNumLowBits)
+#define kLenNumMidBits 3
+#define kLenNumMidSymbols (1 << kLenNumMidBits)
+#define kLenNumHighBits 8
+#define kLenNumHighSymbols (1 << kLenNumHighBits)
+
+#define LenChoice 0
+#define LenChoice2 (LenChoice + 1)
+#define LenLow (LenChoice2 + 1)
+#define LenMid (LenLow + (kNumPosStatesMax << kLenNumLowBits))
+#define LenHigh (LenMid + (kNumPosStatesMax << kLenNumMidBits))
+#define kNumLenProbs (LenHigh + kLenNumHighSymbols) 
+
+
+#define kNumStates 12
+#define kNumLitStates 7
+
+#define kStartPosModelIndex 4
+#define kEndPosModelIndex 14
+#define kNumFullDistances (1 << (kEndPosModelIndex >> 1))
+
+#define kNumPosSlotBits 6
+#define kNumLenToPosStates 4
+
+#define kNumAlignBits 4
+#define kAlignTableSize (1 << kNumAlignBits)
+
+#define kMatchMinLen 2
+
+#define IsMatch 0
+#define IsRep (IsMatch + (kNumStates << kNumPosBitsMax))
+#define IsRepG0 (IsRep + kNumStates)
+#define IsRepG1 (IsRepG0 + kNumStates)
+#define IsRepG2 (IsRepG1 + kNumStates)
+#define IsRep0Long (IsRepG2 + kNumStates)
+#define PosSlot (IsRep0Long + (kNumStates << kNumPosBitsMax))
+#define SpecPos (PosSlot + (kNumLenToPosStates << kNumPosSlotBits))
+#define Align (SpecPos + kNumFullDistances - kEndPosModelIndex)
+#define LenCoder (Align + kAlignTableSize)
+#define RepLenCoder (LenCoder + kNumLenProbs)
+#define Literal (RepLenCoder + kNumLenProbs)
+
+#if Literal != LZMA_BASE_SIZE
+StopCompilingDueBUG
+#endif
+
+int LzmaDecodeProperties(CLzmaProperties *propsRes, const unsigned char *propsData, int size)
+{
+  unsigned char prop0;
+  if (size < LZMA_PROPERTIES_SIZE)
+    return LZMA_RESULT_DATA_ERROR;
+  prop0 = propsData[0];
+  if (prop0 >= (9 * 5 * 5))
+    return LZMA_RESULT_DATA_ERROR;
+  {
+    for (propsRes->pb = 0; prop0 >= (9 * 5); propsRes->pb++, prop0 -= (9 * 5));
+    for (propsRes->lp = 0; prop0 >= 9; propsRes->lp++, prop0 -= 9);
+    propsRes->lc = prop0;
+    /*
+    unsigned char remainder = (unsigned char)(prop0 / 9);
+    propsRes->lc = prop0 % 9;
+    propsRes->pb = remainder / 5;
+    propsRes->lp = remainder % 5;
+    */
+  }
+
+  #ifdef _LZMA_OUT_READ
+  {
+    int i;
+    propsRes->DictionarySize = 0;
+    for (i = 0; i < 4; i++)
+      propsRes->DictionarySize += (UInt32)(propsData[1 + i]) << (i * 8);
+    if (propsRes->DictionarySize == 0)
+      propsRes->DictionarySize = 1;
+  }
+  #endif
+  return LZMA_RESULT_OK;
+}
+
+#define kLzmaStreamWasFinishedId (-1)
+
+int LzmaDecode(CLzmaDecoderState *vs,
+    #ifdef _LZMA_IN_CB
+    ILzmaInCallback *InCallback,
+    #else
+    const unsigned char *inStream, SizeT inSize, SizeT *inSizeProcessed,
+    #endif
+    unsigned char *outStream, SizeT outSize, SizeT *outSizeProcessed)
+{
+  CProb *p = vs->Probs;
+  SizeT nowPos = 0;
+  Byte previousByte = 0;
+  UInt32 posStateMask = (1 << (vs->Properties.pb)) - 1;
+  UInt32 literalPosMask = (1 << (vs->Properties.lp)) - 1;
+  int lc = vs->Properties.lc;
+
+  #ifdef _LZMA_OUT_READ
+  
+  UInt32 Range = vs->Range;
+  UInt32 Code = vs->Code;
+  #ifdef _LZMA_IN_CB
+  const Byte *Buffer = vs->Buffer;
+  const Byte *BufferLim = vs->BufferLim;
+  #else
+  const Byte *Buffer = inStream;
+  const Byte *BufferLim = inStream + inSize;
+  #endif
+  int state = vs->State;
+  UInt32 rep0 = vs->Reps[0], rep1 = vs->Reps[1], rep2 = vs->Reps[2], rep3 = vs->Reps[3];
+  int len = vs->RemainLen;
+  UInt32 globalPos = vs->GlobalPos;
+  UInt32 distanceLimit = vs->DistanceLimit;
+
+  Byte *dictionary = vs->Dictionary;
+  UInt32 dictionarySize = vs->Properties.DictionarySize;
+  UInt32 dictionaryPos = vs->DictionaryPos;
+
+  Byte tempDictionary[4];
+
+  #ifndef _LZMA_IN_CB
+  *inSizeProcessed = 0;
+  #endif
+  *outSizeProcessed = 0;
+  if (len == kLzmaStreamWasFinishedId)
+    return LZMA_RESULT_OK;
+
+  if (dictionarySize == 0)
+  {
+    dictionary = tempDictionary;
+    dictionarySize = 1;
+    tempDictionary[0] = vs->TempDictionary[0];
+  }
+
+  if (len == kLzmaNeedInitId)
+  {
+    {
+      UInt32 numProbs = Literal + ((UInt32)LZMA_LIT_SIZE << (lc + vs->Properties.lp));
+      UInt32 i;
+      for (i = 0; i < numProbs; i++)
+        p[i] = kBitModelTotal >> 1; 
+      rep0 = rep1 = rep2 = rep3 = 1;
+      state = 0;
+      globalPos = 0;
+      distanceLimit = 0;
+      dictionaryPos = 0;
+      dictionary[dictionarySize - 1] = 0;
+      #ifdef _LZMA_IN_CB
+      RC_INIT;
+      #else
+      RC_INIT(inStream, inSize);
+      #endif
+    }
+    len = 0;
+  }
+  while(len != 0 && nowPos < outSize)
+  {
+    UInt32 pos = dictionaryPos - rep0;
+    if (pos >= dictionarySize)
+      pos += dictionarySize;
+    outStream[nowPos++] = dictionary[dictionaryPos] = dictionary[pos];
+    if (++dictionaryPos == dictionarySize)
+      dictionaryPos = 0;
+    len--;
+  }
+  if (dictionaryPos == 0)
+    previousByte = dictionary[dictionarySize - 1];
+  else
+    previousByte = dictionary[dictionaryPos - 1];
+
+  #else /* if !_LZMA_OUT_READ */
+
+  int state = 0;
+  UInt32 rep0 = 1, rep1 = 1, rep2 = 1, rep3 = 1;
+  int len = 0;
+  const Byte *Buffer;
+  const Byte *BufferLim;
+  UInt32 Range;
+  UInt32 Code;
+
+  #ifndef _LZMA_IN_CB
+  *inSizeProcessed = 0;
+  #endif
+  *outSizeProcessed = 0;
+
+  {
+    UInt32 i;
+    UInt32 numProbs = Literal + ((UInt32)LZMA_LIT_SIZE << (lc + vs->Properties.lp));
+    for (i = 0; i < numProbs; i++)
+      p[i] = kBitModelTotal >> 1;
+  }
+  
+  #ifdef _LZMA_IN_CB
+  RC_INIT;
+  #else
+  RC_INIT(inStream, inSize);
+  #endif
+
+  #endif /* _LZMA_OUT_READ */
+
+  while(nowPos < outSize)
+  {
+    CProb *prob;
+    UInt32 bound;
+    int posState = (int)(
+        (nowPos 
+        #ifdef _LZMA_OUT_READ
+        + globalPos
+        #endif
+        )
+        & posStateMask);
+
+    prob = p + IsMatch + (state << kNumPosBitsMax) + posState;
+    IfBit0(prob)
+    {
+      int symbol = 1;
+      UpdateBit0(prob)
+      prob = p + Literal + (LZMA_LIT_SIZE * 
+        (((
+        (nowPos 
+        #ifdef _LZMA_OUT_READ
+        + globalPos
+        #endif
+        )
+        & literalPosMask) << lc) + (previousByte >> (8 - lc))));
+
+      if (state >= kNumLitStates)
+      {
+        int matchByte;
+        #ifdef _LZMA_OUT_READ
+        UInt32 pos = dictionaryPos - rep0;
+        if (pos >= dictionarySize)
+          pos += dictionarySize;
+        matchByte = dictionary[pos];
+        #else
+        matchByte = outStream[nowPos - rep0];
+        #endif
+        do
+        {
+          int bit;
+          CProb *probLit;
+          matchByte <<= 1;
+          bit = (matchByte & 0x100);
+          probLit = prob + 0x100 + bit + symbol;
+          RC_GET_BIT2(probLit, symbol, if (bit != 0) break, if (bit == 0) break)
+        }
+        while (symbol < 0x100);
+      }
+      while (symbol < 0x100)
+      {
+        CProb *probLit = prob + symbol;
+        RC_GET_BIT(probLit, symbol)
+      }
+      previousByte = (Byte)symbol;
+
+      outStream[nowPos++] = previousByte;
+      #ifdef _LZMA_OUT_READ
+      if (distanceLimit < dictionarySize)
+        distanceLimit++;
+
+      dictionary[dictionaryPos] = previousByte;
+      if (++dictionaryPos == dictionarySize)
+        dictionaryPos = 0;
+      #endif
+      if (state < 4) state = 0;
+      else if (state < 10) state -= 3;
+      else state -= 6;
+    }
+    else             
+    {
+      UpdateBit1(prob);
+      prob = p + IsRep + state;
+      IfBit0(prob)
+      {
+        UpdateBit0(prob);
+        rep3 = rep2;
+        rep2 = rep1;
+        rep1 = rep0;
+        state = state < kNumLitStates ? 0 : 3;
+        prob = p + LenCoder;
+      }
+      else
+      {
+        UpdateBit1(prob);
+        prob = p + IsRepG0 + state;
+        IfBit0(prob)
+        {
+          UpdateBit0(prob);
+          prob = p + IsRep0Long + (state << kNumPosBitsMax) + posState;
+          IfBit0(prob)
+          {
+            #ifdef _LZMA_OUT_READ
+            UInt32 pos;
+            #endif
+            UpdateBit0(prob);
+            
+            #ifdef _LZMA_OUT_READ
+            if (distanceLimit == 0)
+            #else
+            if (nowPos == 0)
+            #endif
+              return LZMA_RESULT_DATA_ERROR;
+            
+            state = state < kNumLitStates ? 9 : 11;
+            #ifdef _LZMA_OUT_READ
+            pos = dictionaryPos - rep0;
+            if (pos >= dictionarySize)
+              pos += dictionarySize;
+            previousByte = dictionary[pos];
+            dictionary[dictionaryPos] = previousByte;
+            if (++dictionaryPos == dictionarySize)
+              dictionaryPos = 0;
+            #else
+            previousByte = outStream[nowPos - rep0];
+            #endif
+            outStream[nowPos++] = previousByte;
+            #ifdef _LZMA_OUT_READ
+            if (distanceLimit < dictionarySize)
+              distanceLimit++;
+            #endif
+
+            continue;
+          }
+          else
+          {
+            UpdateBit1(prob);
+          }
+        }
+        else
+        {
+          UInt32 distance;
+          UpdateBit1(prob);
+          prob = p + IsRepG1 + state;
+          IfBit0(prob)
+          {
+            UpdateBit0(prob);
+            distance = rep1;
+          }
+          else 
+          {
+            UpdateBit1(prob);
+            prob = p + IsRepG2 + state;
+            IfBit0(prob)
+            {
+              UpdateBit0(prob);
+              distance = rep2;
+            }
+            else
+            {
+              UpdateBit1(prob);
+              distance = rep3;
+              rep3 = rep2;
+            }
+            rep2 = rep1;
+          }
+          rep1 = rep0;
+          rep0 = distance;
+        }
+        state = state < kNumLitStates ? 8 : 11;
+        prob = p + RepLenCoder;
+      }
+      {
+        int numBits, offset;
+        CProb *probLen = prob + LenChoice;
+        IfBit0(probLen)
+        {
+          UpdateBit0(probLen);
+          probLen = prob + LenLow + (posState << kLenNumLowBits);
+          offset = 0;
+          numBits = kLenNumLowBits;
+        }
+        else
+        {
+          UpdateBit1(probLen);
+          probLen = prob + LenChoice2;
+          IfBit0(probLen)
+          {
+            UpdateBit0(probLen);
+            probLen = prob + LenMid + (posState << kLenNumMidBits);
+            offset = kLenNumLowSymbols;
+            numBits = kLenNumMidBits;
+          }
+          else
+          {
+            UpdateBit1(probLen);
+            probLen = prob + LenHigh;
+            offset = kLenNumLowSymbols + kLenNumMidSymbols;
+            numBits = kLenNumHighBits;
+          }
+        }
+        RangeDecoderBitTreeDecode(probLen, numBits, len);
+        len += offset;
+      }
+
+      if (state < 4)
+      {
+        int posSlot;
+        state += kNumLitStates;
+        prob = p + PosSlot +
+            ((len < kNumLenToPosStates ? len : kNumLenToPosStates - 1) << 
+            kNumPosSlotBits);
+        RangeDecoderBitTreeDecode(prob, kNumPosSlotBits, posSlot);
+        if (posSlot >= kStartPosModelIndex)
+        {
+          int numDirectBits = ((posSlot >> 1) - 1);
+          rep0 = (2 | ((UInt32)posSlot & 1));
+          if (posSlot < kEndPosModelIndex)
+          {
+            rep0 <<= numDirectBits;
+            prob = p + SpecPos + rep0 - posSlot - 1;
+          }
+          else
+          {
+            numDirectBits -= kNumAlignBits;
+            do
+            {
+              RC_NORMALIZE
+              Range >>= 1;
+              rep0 <<= 1;
+              if (Code >= Range)
+              {
+                Code -= Range;
+                rep0 |= 1;
+              }
+            }
+            while (--numDirectBits != 0);
+            prob = p + Align;
+            rep0 <<= kNumAlignBits;
+            numDirectBits = kNumAlignBits;
+          }
+          {
+            int i = 1;
+            int mi = 1;
+            do
+            {
+              CProb *prob3 = prob + mi;
+              RC_GET_BIT2(prob3, mi, ; , rep0 |= i);
+              i <<= 1;
+            }
+            while(--numDirectBits != 0);
+          }
+        }
+        else
+          rep0 = posSlot;
+        if (++rep0 == (UInt32)(0))
+        {
+          /* it's for stream version */
+          len = kLzmaStreamWasFinishedId;
+          break;
+        }
+      }
+
+      len += kMatchMinLen;
+      #ifdef _LZMA_OUT_READ
+      if (rep0 > distanceLimit) 
+      #else
+      if (rep0 > nowPos)
+      #endif
+        return LZMA_RESULT_DATA_ERROR;
+
+      #ifdef _LZMA_OUT_READ
+      if (dictionarySize - distanceLimit > (UInt32)len)
+        distanceLimit += len;
+      else
+        distanceLimit = dictionarySize;
+      #endif
+
+      do
+      {
+        #ifdef _LZMA_OUT_READ
+        UInt32 pos = dictionaryPos - rep0;
+        if (pos >= dictionarySize)
+          pos += dictionarySize;
+        previousByte = dictionary[pos];
+        dictionary[dictionaryPos] = previousByte;
+        if (++dictionaryPos == dictionarySize)
+          dictionaryPos = 0;
+        #else
+        previousByte = outStream[nowPos - rep0];
+        #endif
+        len--;
+        outStream[nowPos++] = previousByte;
+      }
+      while(len != 0 && nowPos < outSize);
+    }
+  }
+  RC_NORMALIZE;
+
+  #ifdef _LZMA_OUT_READ
+  vs->Range = Range;
+  vs->Code = Code;
+  vs->DictionaryPos = dictionaryPos;
+  vs->GlobalPos = globalPos + (UInt32)nowPos;
+  vs->DistanceLimit = distanceLimit;
+  vs->Reps[0] = rep0;
+  vs->Reps[1] = rep1;
+  vs->Reps[2] = rep2;
+  vs->Reps[3] = rep3;
+  vs->State = state;
+  vs->RemainLen = len;
+  vs->TempDictionary[0] = tempDictionary[0];
+  #endif
+
+  #ifdef _LZMA_IN_CB
+  vs->Buffer = Buffer;
+  vs->BufferLim = BufferLim;
+  #else
+  *inSizeProcessed = (SizeT)(Buffer - inStream);
+  #endif
+  *outSizeProcessed = nowPos;
+  return LZMA_RESULT_OK;
+}
diff --git a/init/LzmaDecode.h b/init/LzmaDecode.h
new file mode 100644
index 0000000..213062a
--- /dev/null
+++ b/init/LzmaDecode.h
@@ -0,0 +1,131 @@
+/* 
+  LzmaDecode.h
+  LZMA Decoder interface
+
+  LZMA SDK 4.21 Copyright (c) 1999-2005 Igor Pavlov (2005-06-08)
+  http://www.7-zip.org/
+
+  LZMA SDK is licensed under two licenses:
+  1) GNU Lesser General Public License (GNU LGPL)
+  2) Common Public License (CPL)
+  It means that you can select one of these two licenses and 
+  follow rules of that license.
+
+  SPECIAL EXCEPTION:
+  Igor Pavlov, as the author of this code, expressly permits you to 
+  statically or dynamically link your code (or bind by name) to the 
+  interfaces of this file without subjecting your linked code to the 
+  terms of the CPL or GNU LGPL. Any modifications or additions 
+  to this file, however, are subject to the LGPL or CPL terms.
+*/
+
+#ifndef __LZMADECODE_H
+#define __LZMADECODE_H
+
+/* #define _LZMA_IN_CB */
+/* Use callback for input data */
+
+/* #define _LZMA_OUT_READ */
+/* Use read function for output data */
+
+/* #define _LZMA_PROB32 */
+/* It can increase speed on some 32-bit CPUs, 
+   but memory usage will be doubled in that case */
+
+/* #define _LZMA_LOC_OPT */
+/* Enable local speed optimizations inside code */
+
+/* #define _LZMA_SYSTEM_SIZE_T */
+/* Use system's size_t. You can use it to enable 64-bit sizes supporting*/
+
+#ifndef UInt32
+#ifdef _LZMA_UINT32_IS_ULONG
+#define UInt32 unsigned long
+#else
+#define UInt32 unsigned int
+#endif
+#endif
+
+#ifndef SizeT
+#ifdef _LZMA_SYSTEM_SIZE_T
+#include <stddef.h>
+#define SizeT size_t
+#else
+#define SizeT UInt32
+#endif
+#endif
+
+#ifdef _LZMA_PROB32
+#define CProb UInt32
+#else
+#define CProb unsigned short
+#endif
+
+#define LZMA_RESULT_OK 0
+#define LZMA_RESULT_DATA_ERROR 1
+
+#ifdef _LZMA_IN_CB
+typedef struct _ILzmaInCallback
+{
+  int (*Read)(void *object, const unsigned char **buffer, SizeT *bufferSize);
+} ILzmaInCallback;
+#endif
+
+#define LZMA_BASE_SIZE 1846
+#define LZMA_LIT_SIZE 768
+
+#define LZMA_PROPERTIES_SIZE 5
+
+typedef struct _CLzmaProperties
+{
+  int lc;
+  int lp;
+  int pb;
+  #ifdef _LZMA_OUT_READ
+  UInt32 DictionarySize;
+  #endif
+}CLzmaProperties;
+
+int LzmaDecodeProperties(CLzmaProperties *propsRes, const unsigned char *propsData, int size);
+
+#define LzmaGetNumProbs(Properties) (LZMA_BASE_SIZE + (LZMA_LIT_SIZE << ((Properties)->lc + (Properties)->lp)))
+
+#define kLzmaNeedInitId (-2)
+
+typedef struct _CLzmaDecoderState
+{
+  CLzmaProperties Properties;
+  CProb *Probs;
+
+  #ifdef _LZMA_IN_CB
+  const unsigned char *Buffer;
+  const unsigned char *BufferLim;
+  #endif
+
+  #ifdef _LZMA_OUT_READ
+  unsigned char *Dictionary;
+  UInt32 Range;
+  UInt32 Code;
+  UInt32 DictionaryPos;
+  UInt32 GlobalPos;
+  UInt32 DistanceLimit;
+  UInt32 Reps[4];
+  int State;
+  int RemainLen;
+  unsigned char TempDictionary[4];
+  #endif
+} CLzmaDecoderState;
+
+#ifdef _LZMA_OUT_READ
+#define LzmaDecoderInit(vs) { (vs)->RemainLen = kLzmaNeedInitId; }
+#endif
+
+int LzmaDecode(CLzmaDecoderState *vs,
+    #ifdef _LZMA_IN_CB
+    ILzmaInCallback *inCallback,
+    #else
+    const unsigned char *inStream, SizeT inSize, SizeT *inSizeProcessed,
+    #endif
+    unsigned char *outStream, SizeT outSize, SizeT *outSizeProcessed);
+
+#endif
diff --git a/init/do_mounts_rd.c b/init/do_mounts_rd.c
index ed652f4..5fd1ec5 100644
--- a/init/do_mounts_rd.c
+++ b/init/do_mounts_rd.c
@@ -5,7 +5,9 @@
 #include <linux/ext2_fs.h>
 #include <linux/romfs_fs.h>
 #include <linux/cramfs_fs.h>
+#include <linux/squashfs_fs.h>
 #include <linux/initrd.h>
+#include <linux/vmalloc.h>
 #include <linux/string.h>
 
 #include "do_mounts.h"
@@ -31,6 +33,9 @@ static int __init ramdisk_start_setup(char *str)
 __setup("ramdisk_start=", ramdisk_start_setup);
 
 static int __init crd_load(int in_fd, int out_fd);
+#ifdef CONFIG_LZMA_INITRD
+static int __init lzma_rd_load(int in_fd, int out_fd);
+#endif
 
 /*
  * This routine tries to find a RAM disk image to load, and returns the
@@ -39,6 +44,7 @@ static int __init crd_load(int in_fd, int out_fd);
  * numbers could not be found.
  *
  * We currently check for the following magic numbers:
+ *      squashfs
  * 	minix
  * 	ext2
  *	romfs
@@ -53,6 +59,7 @@ identify_ramdisk_image(int fd, int start_block)
 	struct ext2_super_block *ext2sb;
 	struct romfs_super_block *romfsb;
 	struct cramfs_super *cramfsb;
+	struct squashfs_super_block *squashfsb;
 	int nblocks = -1;
 	unsigned char *buf;
 
@@ -64,6 +71,7 @@ identify_ramdisk_image(int fd, int start_block)
 	ext2sb = (struct ext2_super_block *) buf;
 	romfsb = (struct romfs_super_block *) buf;
 	cramfsb = (struct cramfs_super *) buf;
+	squashfsb = (struct squashfs_super_block *) buf;
 	memset(buf, 0xe5, size);
 
 	/*
@@ -82,6 +90,17 @@ identify_ramdisk_image(int fd, int start_block)
 		nblocks = 0;
 		goto done;
 	}
+	/* 
+	 * handle lzma compressed initrd, returns nblocks=1 as indication
+	 */
+	if( buf[0] < 9 * 5 * 5 && buf[9] == 0 && buf[10] == 0 && buf[11] == 0 
+	   && buf[12] == 0 )
+        {
+               printk( KERN_NOTICE "RAMDISK: LZMA image found at block %d\n",
+                    start_block);
+                nblocks = 1; // just a convenient return flag
+                goto done;
+        } 	   
 
 	/* romfs is at block zero too */
 	if (romfsb->word0 == ROMSB_WORD0 &&
@@ -101,6 +120,18 @@ identify_ramdisk_image(int fd, int start_block)
 		goto done;
 	}
 
+	/* squashfs is at block zero too */
+	if (squashfsb->s_magic == SQUASHFS_MAGIC) {
+		printk(KERN_NOTICE
+		       "RAMDISK: squashfs filesystem found at block %d\n",
+		       start_block);
+		if (squashfsb->s_major < 3)
+			nblocks = (squashfsb->bytes_used_2+BLOCK_SIZE-1)>>BLOCK_SIZE_BITS;
+		else
+			nblocks = (squashfsb->bytes_used+BLOCK_SIZE-1)>>BLOCK_SIZE_BITS;
+		goto done;
+	}
+
 	/*
 	 * Read block 1 to test for minix and ext2 superblock
 	 */
@@ -172,7 +203,22 @@ int __init rd_load_image(char *from)
 #endif
 		goto done;
 	}
-
+#ifdef CONFIG_LZMA_INITRD
+	/*
+	 * handle lzma compressed image
+	 */
+	if ( nblocks == 1 )
+	{
+	    nblocks = 0;
+	    if ( lzma_rd_load(in_fd, out_fd) == 0 )
+	    {
+	    	printk("\nLZMA initrd loaded successfully\n");
+	    	goto successful_load;
+	    }
+	    printk(KERN_NOTICE "LZMA initrd is not in the correct format\n");
+	    goto done;
+	}    	
+#endif
 	/*
 	 * NOTE NOTE: nblocks is not actually blocks but
 	 * the number of kibibytes of data to load into a ramdisk.
@@ -393,6 +439,134 @@ static void __init error(char *x)
 	unzip_error = 1;
 }
 
+#ifdef CONFIG_LZMA_INITRD
+#define _LZMA_IN_CB
+#define _LZMA_OUT_READ
+#include "LzmaDecode.h"
+#include "LzmaDecode.c"
+
+static int read_byte(void *object, const unsigned char **buffer, SizeT *bufferSize);
+
+/*
+ * Do the lzma decompression
+ */
+static int __init lzma_rd_load(int in_fd, int out_fd)
+{
+	unsigned int i;
+	CLzmaDecoderState state;
+	unsigned char* outputbuffer;
+	unsigned int uncompressedSize = 0;
+	unsigned char* p;
+	unsigned int kBlockSize =  0x10000;
+	unsigned int nowPos = 0;
+	unsigned int outsizeProcessed = 0;
+	int res;
+        ILzmaInCallback callback;
+        
+	insize = 0;		/* valid bytes in inbuf */
+	inptr = 0;		/* index of next byte to be processed in inbuf */
+	exit_code = 0;
+	crd_infd = in_fd;
+	inbuf = kmalloc(INBUFSIZ, GFP_KERNEL);
+	if (inbuf == 0) 
+	{
+		printk(KERN_ERR "RAMDISK: Couldn't allocate lzma input buffer\n");
+		return -1;
+        }
+	
+        callback.Read = read_byte;
+
+	/* lzma args */
+	i = get_byte();
+	state.Properties.lc = i % 9, i = i / 9;
+        state.Properties.lp = i % 5, state.Properties.pb = i / 5;
+        
+        /* read dictionary size */
+        p = (char*)&state.Properties.DictionarySize;
+        for (i = 0; i < 4; i++) 
+          *p++ = get_byte();
+          
+        /* get uncompressedSize */ 	
+        p= (char*)&uncompressedSize;	
+        for (i = 0; i < 4; i++) 
+            *p++ = get_byte();
+            
+        /* skip big file */ 
+        for (i = 0; i < 4; i++) 
+        	get_byte();
+        	
+        printk( KERN_NOTICE "RAMDISK: LZMA lc=%d,lp=%d,pb=%d,dictSize=%d,origSize=%d\n",
+           state.Properties.lc, state.Properties.lp, state.Properties.pb, state.Properties.DictionarySize, uncompressedSize);
+	outputbuffer = kmalloc(kBlockSize, GFP_KERNEL);
+	if (outputbuffer == 0) {
+		printk(KERN_ERR "RAMDISK: Couldn't allocate lzma output buffer\n");
+		return -1;
+	}
+	
+        state.Probs =  (CProb*)kmalloc( LzmaGetNumProbs(&state.Properties)*sizeof(CProb), GFP_KERNEL);
+	if ( state.Probs == 0) {
+		printk(KERN_ERR "RAMDISK: Couldn't allocate lzma workspace\n");
+		return -1;
+	}
+	
+#ifdef CONFIG_LZMA_INITRD_KMALLOC_ONLY	
+	state.Dictionary = kmalloc( state.Properties.DictionarySize, GFP_KERNEL);
+#else	
+	state.Dictionary = vmalloc( state.Properties.DictionarySize);
+#endif	
+	if ( state.Dictionary == 0) {
+		printk(KERN_ERR "RAMDISK: Couldn't allocate lzma dictionary\n");
+		return -1;
+	}
+	
+	printk( KERN_NOTICE "LZMA initrd by Ming-Ching Tiew <mctiew@yahoo.com> " );
+	
+	LzmaDecoderInit( &state );
+	  
+	for( nowPos =0; nowPos < uncompressedSize ; )
+	{
+	  UInt32 blockSize = uncompressedSize - nowPos;
+	  if( blockSize > kBlockSize)
+	    blockSize = kBlockSize;
+	  res = LzmaDecode( &state, &callback, outputbuffer, blockSize, &outsizeProcessed);
+	  if( res != 0 ) {
+	     printk( KERN_ERR "RAMDISK: Lzma decode failure\n");
+	     return -1;
+	  }
+	  if( outsizeProcessed == 0 )
+	  {
+	     uncompressedSize = nowPos;
+	     printk( KERN_NOTICE "RAMDISK nowPos=%d, uncompressedSize=%d\n",
+	        nowPos, uncompressedSize ); 
+	     break;
+	  }
+	  sys_write(out_fd, outputbuffer, outsizeProcessed );
+	  nowPos += outsizeProcessed;
+	  printk( ".");
+	}
+	
+#ifdef CONFIG_LZMA_INITRD_KMALLOC_ONLY	
+	kfree(state.Dictionary);
+#else
+	vfree(state.Dictionary);
+#endif
+	kfree(inbuf);
+	kfree(outputbuffer);
+	kfree(state.Probs);
+	return 0;
+}
+
+static int read_byte(void *object, const unsigned char **buffer, SizeT *bufferSize)
+{
+	static unsigned char val;
+	*bufferSize = 1;
+	val = get_byte();
+	*buffer = &val;
+	return LZMA_RESULT_OK;
+}	
+
+#endif /*CONFIG_LZMA_INITRD*/
+
 static int __init crd_load(int in_fd, int out_fd)
 {
 	int result;
diff --git a/init/initramfs.c b/init/initramfs.c
index 00eff7a..30d32a2 100644
--- a/init/initramfs.c
+++ b/init/initramfs.c
@@ -6,6 +6,7 @@
 #include <linux/delay.h>
 #include <linux/string.h>
 #include <linux/syscalls.h>
+#include <linux/vmalloc.h>
 
 static __initdata char *message;
 static void __init error(char *x)
@@ -441,6 +442,118 @@ static void __init flush_window(void)
 	outcnt = 0;
 }
 
+#ifdef CONFIG_LZMA_INITRAM_FS
+#define _LZMA_IN_CB
+#define _LZMA_OUT_READ
+#include "LzmaDecode.h"
+#ifndef CONFIG_LZMA_INITRD
+ #include "LzmaDecode.c"
+#endif
+static int read_byte(void *object, const unsigned char **buffer, SizeT *bufferSize)
+{
+	static unsigned char val;
+        *bufferSize = 1;
+        val = get_byte();
+        *buffer = &val;
+        return LZMA_RESULT_OK;
+}
+                                        
+static int __init lzma_unzip(void)
+{
+	unsigned int i;
+	CLzmaDecoderState state;
+	unsigned char* outputbuffer;
+	unsigned int uncompressedSize = 0;
+	unsigned char* p;
+	unsigned int kBlockSize =  0x10000;
+	unsigned int nowPos = 0;
+	unsigned int outsizeProcessed = 0;
+	int res;
+        ILzmaInCallback callback;
+        
+        callback.Read = read_byte;
+
+	// lzma args
+	i = get_byte();
+	state.Properties.lc = i % 9, i = i / 9;
+        state.Properties.lp = i % 5, state.Properties.pb = i / 5;
+        
+        // read dictionary size
+        p = (char*)&state.Properties.DictionarySize;
+        for (i = 0; i < 4; i++) 
+          *p++ = get_byte();
+          
+        // get uncompressedSize
+        p= (char*)&uncompressedSize;	
+        for (i = 0; i < 4; i++) 
+            *p++ = get_byte();
+            
+        // skip big file
+        for (i = 0; i < 4; i++) 
+        	get_byte();
+        	
+        printk( KERN_NOTICE "initramfs: LZMA lc=%d,lp=%d,pb=%d,dictSize=%d,origSize=%d\n",
+           state.Properties.lc,state.Properties.lp,state.Properties.pb,state.Properties.DictionarySize, uncompressedSize);
+	outputbuffer = kmalloc(kBlockSize, GFP_KERNEL); 	
+	if (outputbuffer == 0) {
+	   printk(KERN_ERR "initramfs: Couldn't allocate lzma output buffer\n");
+	   return -1;
+	}
+	
+        state.Probs =  (CProb*) kmalloc( LzmaGetNumProbs(&state.Properties)*sizeof(CProb), GFP_KERNEL);
+	if ( state.Probs == 0) {
+		printk(KERN_ERR "initramfs: Couldn't allocate lzma workspace\n");
+		return -1;
+	}
+	
+#ifdef CONFIG_LZMA_INITRAM_FS_KMALLOC_ONLY
+	state.Dictionary = kmalloc( state.Properties.DictionarySize, GFP_KERNEL);
+#else
+	state.Dictionary = vmalloc( state.Properties.DictionarySize);
+#endif
+	if ( state.Dictionary == 0) {
+		printk(KERN_ERR "initramfs: Couldn't allocate lzma dictionary\n");
+		return -1;
+	}
+	
+	printk( KERN_NOTICE "LZMA initramfs by Ming-Ching Tiew <mctiew@yahoo.com> " );
+	
+	LzmaDecoderInit( &state );
+	  
+	for( nowPos =0; nowPos < uncompressedSize ; )
+	{
+	  UInt32 blockSize = uncompressedSize - nowPos;
+	  if( blockSize > kBlockSize)
+	    blockSize = kBlockSize;
+	  res = LzmaDecode( &state, &callback, outputbuffer, blockSize, &outsizeProcessed);
+	  if( res != 0 ) {
+	     panic( KERN_ERR "initramfs: Lzma decode failure\n");
+	     return -1;
+	  }
+	  if( outsizeProcessed == 0 )
+	  {
+	     uncompressedSize = nowPos;
+	     printk( KERN_NOTICE "initramfs: nowPos=%d, uncompressedSize=%d\n",
+	        nowPos, uncompressedSize ); 
+	     break;
+	  }
+	  flush_buffer(outputbuffer, outsizeProcessed);
+	  nowPos += outsizeProcessed;
+	  printk( ".");
+	}
+	
+#ifdef CONFIG_LZMA_INITRAM_FS_KMALLOC_ONLY
+	kfree(state.Dictionary);
+#else
+	vfree(state.Dictionary);
+#endif
+	kfree(outputbuffer);
+	kfree(state.Probs);
+	return 0;
+}
+
+#endif /*CONFIG LZMA_INITRAM_FS*/
+
 static char * __init unpack_to_rootfs(char *buf, unsigned len, int check_only)
 {
 	int written;
@@ -475,12 +588,31 @@ static char * __init unpack_to_rootfs(char *buf, unsigned len, int check_only)
 		inptr = 0;
 		outcnt = 0;		/* bytes in output buffer */
 		bytes_out = 0;
-		crc = (ulg)0xffffffffL; /* shift register contents */
-		makecrc();
-		gunzip();
-		if (state != Reset)
+		if( inbuf[0] == 037 && ((inbuf[1] == 0213) || (inbuf[1] == 0236)))
+		{  
+		   printk( KERN_NOTICE "detected gzip initramfs\n");
+		   crc = (ulg)0xffffffffL; /* shift register contents */
+		   makecrc();
+		   gunzip();
+		   if (state != Reset)
 			error("junk in gzipped archive");
-		this_header = saved_offset + inptr;
+		}
+#ifdef CONFIG_LZMA_INITRAM_FS
+		else if( inbuf[0] < 9 * 5 * 5 && buf[9] == 0 && buf[10] == 0 
+		  && buf[11] == 0 && buf[12] == 0 )
+		{
+		   printk( KERN_NOTICE "detected lzma initramfs\n");
+		   lzma_unzip();
+		}
+#endif	
+		else
+		{  
+		   // skip forward ?
+		   crc = (ulg)0xffffffffL; /* shift register contents */
+		   makecrc();
+		   gunzip();
+		}
+	        this_header = saved_offset + inptr;
 		buf += inptr;
 		len -= inptr;
 	}
diff --git a/kernel/Makefile b/kernel/Makefile
index ac6b27a..bd498a2 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -66,7 +66,7 @@ $(obj)/configs.o: $(obj)/config_data.h
 # config_data.h contains the same information as ikconfig.h but gzipped.
 # Info from config_data can be extracted from /proc/config*
 targets += config_data.gz
-$(obj)/config_data.gz: .config FORCE
+$(obj)/config_data.gz: .miniconfig FORCE
 	$(call if_changed,gzip)
 
 quiet_cmd_ikconfiggz = IKCFG   $@
diff --git a/kernel/configs.c b/kernel/configs.c
index 8fa1fb2..c8407eb 100644
--- a/kernel/configs.c
+++ b/kernel/configs.c
@@ -88,7 +88,7 @@ static int __init ikconfig_init(void)
 	struct proc_dir_entry *entry;
 
 	/* create the current config file */
-	entry = create_proc_entry("config.gz", S_IFREG | S_IRUGO,
+	entry = create_proc_entry("miniconfig.gz", S_IFREG | S_IRUGO,
 				  &proc_root);
 	if (!entry)
 		return -ENOMEM;
@@ -104,7 +104,7 @@ static int __init ikconfig_init(void)
 
 static void __exit ikconfig_cleanup(void)
 {
-	remove_proc_entry("config.gz", &proc_root);
+	remove_proc_entry("miniconfig.gz", &proc_root);
 }
 
 module_init(ikconfig_init);
diff --git a/kernel/time/clocksource.c b/kernel/time/clocksource.c
index fe5c7db..a5150e6 100644
--- a/kernel/time/clocksource.c
+++ b/kernel/time/clocksource.c
@@ -85,8 +85,8 @@ static void clocksource_ratewd(struct clocksource *cs, int64_t delta)
 	if (delta > -WATCHDOG_TRESHOLD && delta < WATCHDOG_TRESHOLD)
 		return;
 
-	printk(KERN_WARNING "Clocksource %s unstable (delta = %Ld ns)\n",
-	       cs->name, delta);
+/*	printk(KERN_WARNING "Clocksource %s unstable (delta = %Ld ns)\n",
+	       cs->name, delta); */
 	cs->flags &= ~(CLOCK_SOURCE_VALID_FOR_HRES | CLOCK_SOURCE_WATCHDOG);
 	clocksource_change_rating(cs, 0);
 	cs->flags &= ~CLOCK_SOURCE_WATCHDOG;
diff --git a/kernel/timer.c b/kernel/timer.c
index dd6c2c1..3a8f485 100644
--- a/kernel/timer.c
+++ b/kernel/timer.c
@@ -916,8 +916,8 @@ static void change_clocksource(void)
 
 	tick_clock_notify();
 
-	printk(KERN_INFO "Time: %s clocksource has been installed.\n",
-	       clock->name);
+/*	printk(KERN_INFO "Time: %s clocksource has been installed.\n",
+	       clock->name); */
 }
 #else
 static inline void change_clocksource(void) { }
diff --git a/miniconfig.sh b/miniconfig.sh
new file mode 100755
index 0000000..28e7433
--- /dev/null
+++ b/miniconfig.sh
@@ -0,0 +1,2 @@
+#!/bin/sh -f
+make allnoconfig KCONFIG_ALLCONFIG=.miniconfig 
diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
index fc498fe..e98172c 100644
--- a/scripts/Makefile.lib
+++ b/scripts/Makefile.lib
@@ -162,4 +162,9 @@ cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@
 quiet_cmd_gzip = GZIP    $@
 cmd_gzip = gzip -f -9 < $< > $@
 
+# LZMA
+#
+quiet_cmd_lzma = LZMA    $@
+cmd_lzma = lzma e $< $@ -lc7 -lp0 -pb0 2>/dev/null
+
 
diff --git a/scripts/gen_lzma_initramfs_list.sh b/scripts/gen_lzma_initramfs_list.sh
new file mode 100644
index 0000000..be3ed6a
--- /dev/null
+++ b/scripts/gen_lzma_initramfs_list.sh
@@ -0,0 +1,292 @@
+#!/bin/bash
+# Copyright (C) Martin Schlemmer <azarah@nosferatu.za.org>
+# Copyright (c) 2006           Sam Ravnborg <sam@ravnborg.org>
+#
+# Released under the terms of the GNU GPL
+#
+# Generate a cpio packed initramfs. It uses gen_init_cpio to generate
+# the cpio archive, and gzip to pack it.
+# The script may also be used to generate the inputfile used for gen_init_cpio
+# This script assumes that gen_init_cpio is located in usr/ directory
+
+# error out on errors
+set -e
+
+usage() {
+cat << EOF
+Usage:
+$0 [-o <file>] [-u <uid>] [-g <gid>] { -s | -d | <cpio_source>} ...
+	-o <file>      Create lzma initramfs file named <file> using
+	               gen_init_cpio and lzma
+	-u <uid>       User ID to map to user ID 0 (root).
+	               <uid> is only meaningful if <cpio_source>
+	               is a directory.
+	-g <gid>       Group ID to map to group ID 0 (root).
+	               <gid> is only meaningful if <cpio_source>
+	               is a directory.
+	<cpio_source>  File list or directory for cpio archive.
+	               If <cpio_source> is a .cpio file it will be used
+		       as direct input to initramfs.
+	-s	       Create lzma file with small dictionary size
+	-d             Output the default cpio list.
+
+All options except -o and -l may be repeated and are interpreted
+sequentially and immediately.  -u and -g states are preserved across
+<cpio_source> options so an explicit "-u 0 -g 0" is required
+to reset the root/group mapping.
+EOF
+}
+
+list_default_initramfs() {
+	# echo usr/kinit/kinit
+	:
+}
+
+default_initramfs() {
+	cat <<-EOF >> ${output}
+		# This is a very simple, default initramfs
+
+		dir /dev 0755 0 0
+		nod /dev/console 0600 0 0 c 5 1
+		dir /root 0700 0 0
+		# file /kinit usr/kinit/kinit 0755 0 0
+		# slink /init kinit 0755 0 0
+	EOF
+}
+
+filetype() {
+	local argv1="$1"
+
+	# symlink test must come before file test
+	if [ -L "${argv1}" ]; then
+		echo "slink"
+	elif [ -f "${argv1}" ]; then
+		echo "file"
+	elif [ -d "${argv1}" ]; then
+		echo "dir"
+	elif [ -b "${argv1}" -o -c "${argv1}" ]; then
+		echo "nod"
+	elif [ -p "${argv1}" ]; then
+		echo "pipe"
+	elif [ -S "${argv1}" ]; then
+		echo "sock"
+	else
+		echo "invalid"
+	fi
+	return 0
+}
+
+list_print_mtime() {
+	:
+}
+
+print_mtime() {
+	local my_mtime="0"
+
+	if [ -e "$1" ]; then
+		my_mtime=$(find "$1" -printf "%T@\n" | sort -r | head -n 1)
+	fi
+
+	echo "# Last modified: ${my_mtime}" >> ${output}
+	echo "" >> ${output}
+}
+
+list_parse() {
+	echo "$1 \\"
+}
+
+# for each file print a line in following format
+# <filetype> <name> <path to file> <octal mode> <uid> <gid>
+# for links, devices etc the format differs. See gen_init_cpio for details
+parse() {
+	local location="$1"
+	local name="${location/${srcdir}//}"
+	# change '//' into '/'
+	name="${name//\/\///}"
+	local mode="$2"
+	local uid="$3"
+	local gid="$4"
+	local ftype=$(filetype "${location}")
+	# remap uid/gid to 0 if necessary
+	[ "$uid" -eq "$root_uid" ] && uid=0
+	[ "$gid" -eq "$root_gid" ] && gid=0
+	local str="${mode} ${uid} ${gid}"
+
+	[ "${ftype}" == "invalid" ] && return 0
+	[ "${location}" == "${srcdir}" ] && return 0
+
+	case "${ftype}" in
+		"file")
+			str="${ftype} ${name} ${location} ${str}"
+			;;
+		"nod")
+			local dev_type=
+			local maj=$(LC_ALL=C ls -l "${location}" | \
+					gawk '{sub(/,/, "", $5); print $5}')
+			local min=$(LC_ALL=C ls -l "${location}" | \
+					gawk '{print $6}')
+
+			if [ -b "${location}" ]; then
+				dev_type="b"
+			else
+				dev_type="c"
+			fi
+			str="${ftype} ${name} ${str} ${dev_type} ${maj} ${min}"
+			;;
+		"slink")
+			local target=$(LC_ALL=C ls -l "${location}" | \
+					gawk '{print $11}')
+			str="${ftype} ${name} ${target} ${str}"
+			;;
+		*)
+			str="${ftype} ${name} ${str}"
+			;;
+	esac
+
+	echo "${str}" >> ${output}
+
+	return 0
+}
+
+unknown_option() {
+	printf "ERROR: unknown option \"$arg\"\n" >&2
+	printf "If the filename validly begins with '-', " >&2
+	printf "then it must be prefixed\n" >&2
+	printf "by './' so that it won't be interpreted as an option." >&2
+	printf "\n" >&2
+	usage >&2
+	exit 1
+}
+
+list_header() {
+	:
+}
+
+header() {
+	printf "\n#####################\n# $1\n" >> ${output}
+}
+
+# process one directory (incl sub-directories)
+dir_filelist() {
+	${dep_list}header "$1"
+
+	srcdir=$(echo "$1" | sed -e 's://*:/:g')
+	dirlist=$(find "${srcdir}" -printf "%p %m %U %G\n" 2>/dev/null)
+
+	# If $dirlist is only one line, then the directory is empty
+	if [  "$(echo "${dirlist}" | wc -l)" -gt 1 ]; then
+		${dep_list}print_mtime "$1"
+
+		echo "${dirlist}" | \
+		while read x; do
+			${dep_list}parse ${x}
+		done
+	fi
+}
+
+# if only one file is specified and it is .cpio file then use it direct as fs
+# if a directory is specified then add all files in given direcotry to fs
+# if a regular file is specified assume it is in gen_initramfs format
+input_file() {
+	source="$1"
+	if [ -f "$1" ]; then
+		${dep_list}header "$1"
+		is_cpio="$(echo "$1" | sed 's/^.*\.cpio/cpio/')"
+		if [ $2 -eq 0 -a ${is_cpio} == "cpio" ]; then
+			cpio_file=$1
+			[ ! -z ${dep_list} ] && echo "$1"
+			return 0
+		fi
+		if [ -z ${dep_list} ]; then
+			print_mtime "$1" >> ${output}
+			cat "$1"         >> ${output}
+		else
+			cat "$1" | while read type dir file perm ; do
+				if [ "$type" == "file" ]; then
+					echo "$file \\";
+				fi
+			done
+		fi
+	elif [ -d "$1" ]; then
+		dir_filelist "$1"
+	else
+		echo "  ${prog}: Cannot open '$1'" >&2
+		exit 1
+	fi
+}
+
+prog=$0
+root_uid=0
+root_gid=0
+dep_list=
+cpio_file=
+cpio_list=
+output="/dev/stdout"
+output_file=""
+opt=""
+
+arg="$1"
+case "$arg" in
+	"-l")	# files included in initramfs - used by kbuild
+		dep_list="list_"
+		echo "deps_initramfs := \\"
+		shift
+		;;
+	"-o")	# generate lzma-ed cpio image named $1
+		shift
+		output_file="$1"
+		cpio_list="$(mktemp ${TMPDIR:-/tmp}/cpiolist.XXXXXX)"
+		output=${cpio_list}
+		shift
+		;;
+esac
+while [ $# -gt 0 ]; do
+	arg="$1"
+	shift
+	case "$arg" in
+		"-u")	# map $1 to uid=0 (root)
+			root_uid="$1"
+			shift
+			;;
+		"-g")	# map $1 to gid=0 (root)
+			root_gid="$1"
+			shift
+			;;
+		"-s")
+			opt="-d16"
+			;;
+		"-d")	# display default initramfs list
+			default_list="$arg"
+			${dep_list}default_initramfs
+			;;
+		"-h")
+			usage
+			exit 0
+			;;
+		*)
+			case "$arg" in
+				"-"*)
+					unknown_option
+					;;
+				*)	# input file/dir - process it
+					input_file "$arg" "$#"
+					;;
+			esac
+			;;
+	esac
+done
+
+# If output_file is set we will generate cpio archive and lzma it
+# we are carefull to delete tmp files
+if [ ! -z ${output_file} ]; then
+	if [ -z ${cpio_file} ]; then
+		cpio_tfile="$(mktemp ${TMPDIR:-/tmp}/cpiofile.XXXXXX)"
+		usr/gen_init_cpio ${cpio_list} > ${cpio_tfile}
+	else
+		cpio_tfile=${cpio_file}
+	fi
+	rm ${cpio_list}
+	lzma e ${cpio_tfile} ${output_file} ${opt}
+	[ -z ${cpio_file} ] && rm ${cpio_tfile}
+fi
+exit 0
diff --git a/shrinkconfig.sh b/shrinkconfig.sh
new file mode 100755
index 0000000..e7a3df7
--- /dev/null
+++ b/shrinkconfig.sh
@@ -0,0 +1,79 @@
+#! /bin/bash
+
+# shrinkconfig copyright 2006 by Rob Landley <rob@landley.net>
+# Licensed under the GNU General Public License version 2.
+
+if [ $# -ne 1 ]
+then
+  echo "Turns current .config into a miniconfig file."
+  echo "Usage: shrinkconfig mini.config"
+  exit 1
+fi
+
+if [ ! -f .config ]
+then
+  echo "Need a .config file to shrink."
+  exit 1
+fi
+LENGTH=$(wc -l < .config)
+
+OUTPUT="$1"
+cp .config "$OUTPUT"
+if [ $? -ne 0 ]
+then
+  echo "Couldn't create $OUTPUT"
+  exit 1
+fi
+
+# If we get interrupted, clean up the mess
+
+KERNELOUTPUT=""
+
+function cleanup
+{
+  echo
+  echo "Interrupted."
+  [ ! -z "$KERNELOUTPUT" ] && rm -rf "$KERNELOUTPUT"
+  rm "$OUTPUT"
+  exit 1
+}
+
+trap cleanup HUP INT QUIT TERM
+
+# Since the "O=" argument to make doesn't work recursively, we need to jump
+# through a few hoops to avoid overwriting the .config that we're shrinking.
+
+# If we're building out of tree, we'll have absolute paths to source and build
+# directories in the Makefile.
+
+KERNELSRC=$(sed -n -e 's/KERNELSRC[^/]*:=[^/]*//p' Makefile)
+[ -z "$KERNELSRC" ] && KERNELSRC=$(pwd)
+KERNELOUTPUT=`pwd`/.config.minitemp
+
+mkdir -p "$KERNELOUTPUT" || exit 1
+
+echo "Shrinking .config to $OUTPUT..."
+
+for I in $(seq 1 $LENGTH)
+do
+  echo -n -e "\r"$I/$LENGTH lines $(wc -c < "$OUTPUT") bytes
+
+  sed -n "${I}!p" "$OUTPUT" > "$KERNELOUTPUT"/.config.test
+  # Do a config with this file
+  make -C "$KERNELSRC" O="$KERNELOUTPUT" allnoconfig KCONFIG_ALLCONFIG="$KERNELOUTPUT"/.config.test > /dev/null
+
+  # Compare.  The date changes, so expect a small difference each time.
+  D=$(diff "$KERNELOUTPUT"/.config .config | wc -l)
+  if [ $D -eq 4 ]
+  then
+    mv "$KERNELOUTPUT"/.config.test "$OUTPUT"
+    LENGTH=$[$LENGTH-1]
+  else
+    I=$[$I + 1]
+  fi
+done
+
+rm -rf "$KERNELOUTPUT"
+
+# One extra echo to preserve status line.
+echo
diff --git a/usr/Makefile b/usr/Makefile
index 201f27f..8e1f6ea 100644
--- a/usr/Makefile
+++ b/usr/Makefile
@@ -19,6 +19,7 @@ $(obj)/initramfs_data.o: $(obj)/initramfs_data.cpio.gz FORCE
 
 hostprogs-y := gen_init_cpio
 initramfs   := $(CONFIG_SHELL) $(srctree)/scripts/gen_initramfs_list.sh
+lzma_initramfs := $(CONFIG_SHELL) $(srctree)/scripts/gen_lzma_initramfs_list.sh
 ramfs-input := $(if $(filter-out "",$(CONFIG_INITRAMFS_SOURCE)), \
 			$(shell echo $(CONFIG_INITRAMFS_SOURCE)),-d)
 ramfs-args  := \
@@ -36,6 +37,14 @@ endif
 quiet_cmd_initfs = GEN     $@
       cmd_initfs = $(initramfs) -o $@ $(ramfs-args) $(ramfs-input)
 
+ifdef CONFIG_LZMA_INITRAM_FS_SMALLMEM
+quiet_cmd_lzma_initfs = LZRAMFS $@
+      cmd_lzma_initfs = $(lzma_initramfs) -o $@ $(ramfs-args) -s $(ramfs-input)
+else
+quiet_cmd_lzma_initfs = LZRAMFS $@
+      cmd_lzma_initfs = $(lzma_initramfs) -o $@ $(ramfs-args) $(ramfs-input)
+endif
+
 targets := initramfs_data.cpio.gz
 # do not try to update files included in initramfs
 $(deps_initramfs): ;
@@ -48,5 +57,9 @@ $(deps_initramfs): klibcdirs
 # 4) arguments to gen_initramfs.sh changes
 $(obj)/initramfs_data.cpio.gz: $(obj)/gen_init_cpio $(deps_initramfs) klibcdirs
 	$(Q)$(initramfs) -l $(ramfs-input) > $(obj)/.initramfs_data.cpio.gz.d
+ifdef CONFIG_LZMA_INITRAM_FS
+	$(call if_changed,lzma_initfs)
+else
 	$(call if_changed,initfs)
+endif