fs/f2fs: add option to define discard policy

Signed-off-by: Grzegorz Blach <grzegorz@blach.pl>
[Thomas: split from the initial patch from Grzegorz]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

fs/f2fs/Config.in

@@ -36,4 +36,10 @@ config BR2_TARGET_ROOTFS_F2FS_OVERPROVISION
 	  Leave at 0 to use the default overprovision ratio of
 	  mkfs.f2fs.
 
+config BR2_TARGET_ROOTFS_F2FS_DISCARD
+	bool "discard policy"
+	default y
+	help
+	  Enable or disable discard policy.
+
 endif # BR2_TARGET_ROOTFS_F2FS

fs/f2fs/f2fs.mk

@@ -19,9 +19,16 @@ ifneq ($(BR2_TARGET_ROOTFS_F2FS_OVERPROVISION),0)
 F2FS_OVERPROVISION = $(BR2_TARGET_ROOTFS_F2FS_OVERPROVISION)
 endif
 
+ifeq ($(BR2_TARGET_ROOTFS_F2FS_DISCARD),y)
+F2FS_DISCARD = 1
+else
+F2FS_DISCARD = 0
+endif
+
 F2FS_OPTS = \
 	-f \
 	-l "$(F2FS_LABEL)" \
+	-t $(F2FS_DISCARD) \
 	$(if $(F2FS_COLD_FILES),-e "$(F2FS_COLD_FILES)") \
 	$(if $(F2FS_OVERPROVISION),-o $(F2FS_OVERPROVISION))