package/zfs: fix uClibc support

This update addresses the issue of uClibc support by skipping ZFS tests
that require SEEK_DATA support.

This is a work-in-progress patch while we wait for an upstream fix.
Current upstream efforts can be followed here:
https://github.com/openzfs/zfs/pull/16169

Context:
- OpenZFS includes a test for a bug that occurs when copying a large
  number of PUNCHED files.
- OpenZFS has backported this test to v2.2.x.
- uClibc does not support SEEK_DATA and SEEK_HOLE.
- The ZFS test `cp_stress` can not be compiled using uClibc.

This commit fix:
- https://gitlab.com/buildroot.org/buildroot/-/jobs/7391793226

Signed-off-by: José Luis Salvador Rufo <salvador.joseluis@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/zfs/0001-tests-cp_files-ignore-if-SEEK_DATA-is-not-defined.patch

@@ -0,0 +1,162 @@
+From 93e7f8889072047276da11fe6a525d3f0ea16205 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Jos=C3=A9=20Luis=20Salvador=20Rufo?=
+ <salvador.joseluis@gmail.com>
+Date: Sat, 11 May 2024 22:40:12 +0200
+Subject: [PATCH] tests/cp_files: ignore if SEEK_DATA is not defined
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Not all C libraries support SEEK_DATA (e.g., uClibc). Skip the test case
+cp_files if SEEK_DATA is not defined.
+
+Signed-off-by: José Luis Salvador Rufo <salvador.joseluis@gmail.com>
+Upstream: https://github.com/openzfs/zfs/pull/16169
+---
+ config/user-unistd.m4                  | 24 ++++++++++++++++++++++++
+ config/user.m4                         |  1 +
+ config/zfs-build.m4                    |  1 +
+ tests/test-runner/bin/zts-report.py.in |  1 +
+ tests/zfs-tests/Makefile.am            |  2 ++
+ tests/zfs-tests/cmd/Makefile.am        |  6 +++++-
+ tests/zfs-tests/tests/Makefile.am      | 14 +++++++++-----
+ 7 files changed, 43 insertions(+), 6 deletions(-)
+ create mode 100644 config/user-unistd.m4
+
+diff --git a/config/user-unistd.m4 b/config/user-unistd.m4
+new file mode 100644
+index 000000000..302bc0bde
+--- /dev/null
++++ b/config/user-unistd.m4
+@@ -0,0 +1,24 @@
++dnl #
++dnl # Check for SEEK_DATA - only used for cp_files/seekflood test case.
++dnl #
++AC_DEFUN([ZFS_AC_CONFIG_USER_UNISTD_SEEK_DATA], [
++	AC_MSG_CHECKING(whether host toolchain supports SEEK_DATA)
++
++	AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
++		#ifndef _GNU_SOURCE
++		#define _GNU_SOURCE
++		#endif
++		#include <unistd.h>
++		#if defined(SEEK_DATA)
++			int ok;
++		#else
++			error fail
++		#endif
++	]])], [
++		user_unistd_seek_data=yes
++		AC_MSG_RESULT([yes])
++	], [
++		user_unistd_seek_data=no
++		AC_MSG_RESULT([no])
++	])
++])
+diff --git a/config/user.m4 b/config/user.m4
+index 6ec27a5b2..2326a44be 100644
+--- a/config/user.m4
++++ b/config/user.m4
+@@ -23,6 +23,7 @@ AC_DEFUN([ZFS_AC_CONFIG_USER], [
+ 	ZFS_AC_CONFIG_USER_LIBAIO
+ 	ZFS_AC_CONFIG_USER_LIBATOMIC
+ 	ZFS_AC_CONFIG_USER_LIBFETCH
++	ZFS_AC_CONFIG_USER_UNISTD_SEEK_DATA
+ 	ZFS_AC_CONFIG_USER_AIO_H
+ 	ZFS_AC_CONFIG_USER_CLOCK_GETTIME
+ 	ZFS_AC_CONFIG_USER_PAM
+diff --git a/config/zfs-build.m4 b/config/zfs-build.m4
+index bb5a85d81..578692676 100644
+--- a/config/zfs-build.m4
++++ b/config/zfs-build.m4
+@@ -294,6 +294,7 @@ AC_DEFUN([ZFS_AC_CONFIG], [
+ 	    [test "x$qatsrc" != x ])
+ 	AM_CONDITIONAL([WANT_DEVNAME2DEVID], [test "x$user_libudev" = xyes ])
+ 	AM_CONDITIONAL([WANT_MMAP_LIBAIO], [test "x$user_libaio" = xyes ])
++	AM_CONDITIONAL([WANT_UNISTD_SEEK_DATA], [test "x$user_unistd_seek_data" = xyes ])
+ 	AM_CONDITIONAL([PAM_ZFS_ENABLED], [test "x$enable_pam" = xyes])
+ ])
+ 
+diff --git a/tests/test-runner/bin/zts-report.py.in b/tests/test-runner/bin/zts-report.py.in
+index ecc50f487..3a00345ed 100755
+--- a/tests/test-runner/bin/zts-report.py.in
++++ b/tests/test-runner/bin/zts-report.py.in
+@@ -162,6 +162,7 @@ known = {
+         ['FAIL', rewind_reason],
+     'cli_user/misc/zfs_share_001_neg': ['SKIP', na_reason],
+     'cli_user/misc/zfs_unshare_001_neg': ['SKIP', na_reason],
++    'cp_files/cp_stress': ['SKIP', 16169],
+     'pool_checkpoint/checkpoint_discard_busy': ['SKIP', 12053],
+     'privilege/setup': ['SKIP', na_reason],
+     'refreserv/refreserv_004_pos': ['FAIL', known_reason],
+diff --git a/tests/zfs-tests/Makefile.am b/tests/zfs-tests/Makefile.am
+index 3dd1a6452..8ae790057 100644
+--- a/tests/zfs-tests/Makefile.am
++++ b/tests/zfs-tests/Makefile.am
+@@ -13,8 +13,10 @@ scripts_zfs_tests_functional_hkdf_PROGRAMS = %D%/tests/functional/hkdf/hkdf_test
+ %C%_tests_functional_hkdf_hkdf_test_LDADD = \
+ 	libzpool.la
+ 
++if WANT_UNISTD_SEEK_DATA
+ scripts_zfs_tests_functional_cp_filesdir = $(datadir)/$(PACKAGE)/zfs-tests/tests/functional/cp_files
+ scripts_zfs_tests_functional_cp_files_PROGRAMS = %D%/tests/functional/cp_files/seekflood
++endif
+ 
+ if BUILD_LINUX
+ scripts_zfs_tests_functional_tmpfiledir = $(datadir)/$(PACKAGE)/zfs-tests/tests/functional/tmpfile
+diff --git a/tests/zfs-tests/cmd/Makefile.am b/tests/zfs-tests/cmd/Makefile.am
+index 23848a82f..69bba3039 100644
+--- a/tests/zfs-tests/cmd/Makefile.am
++++ b/tests/zfs-tests/cmd/Makefile.am
+@@ -5,7 +5,6 @@ scripts_zfs_tests_bin_PROGRAMS  = %D%/chg_usr_exec
+ scripts_zfs_tests_bin_PROGRAMS += %D%/clonefile
+ scripts_zfs_tests_bin_PROGRAMS += %D%/clone_mmap_cached
+ scripts_zfs_tests_bin_PROGRAMS += %D%/clone_mmap_write
+-scripts_zfs_tests_bin_PROGRAMS += %D%/cp_files
+ scripts_zfs_tests_bin_PROGRAMS += %D%/ctime
+ scripts_zfs_tests_bin_PROGRAMS += %D%/dir_rd_update
+ scripts_zfs_tests_bin_PROGRAMS += %D%/dosmode_readonly_write
+@@ -16,6 +15,11 @@ scripts_zfs_tests_bin_PROGRAMS += %D%/truncate_test
+ scripts_zfs_tests_bin_PROGRAMS += %D%/zfs_diff-socket
+ 
+ 
++if WANT_UNISTD_SEEK_DATA
++scripts_zfs_tests_bin_PROGRAMS += %D%/cp_files
++endif
++
++
+ scripts_zfs_tests_bin_PROGRAMS += %D%/badsend
+ %C%_badsend_LDADD = \
+ 	libzfs_core.la \
+diff --git a/tests/zfs-tests/tests/Makefile.am b/tests/zfs-tests/tests/Makefile.am
+index cc66d762f..1e9f06a7e 100644
+--- a/tests/zfs-tests/tests/Makefile.am
++++ b/tests/zfs-tests/tests/Makefile.am
+@@ -1394,11 +1394,6 @@ nobase_dist_datadir_zfs_tests_tests_SCRIPTS += \
+ 	functional/compression/l2arc_encrypted.ksh \
+ 	functional/compression/l2arc_encrypted_no_compressed_arc.ksh \
+ 	functional/compression/setup.ksh \
+-	functional/cp_files/cleanup.ksh \
+-	functional/cp_files/cp_files_001_pos.ksh \
+-	functional/cp_files/cp_files_002_pos.ksh \
+-	functional/cp_files/cp_stress.ksh \
+-	functional/cp_files/setup.ksh \
+ 	functional/crtime/cleanup.ksh \
+ 	functional/crtime/crtime_001_pos.ksh \
+ 	functional/crtime/setup.ksh \
+@@ -2108,3 +2103,12 @@ nobase_dist_datadir_zfs_tests_tests_SCRIPTS += \
+ 	functional/idmap_mount/idmap_mount_003.ksh \
+ 	functional/idmap_mount/idmap_mount_004.ksh \
+ 	functional/idmap_mount/idmap_mount_005.ksh
++
++if WANT_UNISTD_SEEK_DATA
++nobase_dist_datadir_zfs_tests_tests_SCRIPTS += \
++	functional/cp_files/cleanup.ksh \
++	functional/cp_files/cp_files_001_pos.ksh \
++	functional/cp_files/cp_files_002_pos.ksh \
++	functional/cp_files/cp_stress.ksh \
++	functional/cp_files/setup.ksh
++endif
+-- 
+2.45.2
+

package/zfs/zfs.mk

@@ -12,7 +12,7 @@ ZFS_LICENSE_FILES = LICENSE COPYRIGHT
 ZFS_CPE_ID_VENDOR = openzfs
 ZFS_CPE_ID_PRODUCT = openzfs
 
-# 0001-config-user-check-for-aio.h.patch
+# 0001-tests-cp_files-ignore-if-SEEK_DATA-is-not-defined.patch
 ZFS_AUTORECONF = YES
 
 ZFS_DEPENDENCIES = libaio openssl udev util-linux zlib libcurl linux