Commit 9e615dbb authored by Yangtao Li's avatar Yangtao Li Committed by Jaegeuk Kim
Browse files

f2fs: add missing description for ipu_policy node 



IPU policy can be disabled, let's add description for it and other policy.

Signed-off-by: default avatarYangtao Li <frank.li@vivo.com>
Reviewed-by: default avatarChao Yu <chao@kernel.org>
Signed-off-by: default avatarJaegeuk Kim <jaegeuk@kernel.org>
parent c5bf8348

Documentation/ABI/testing/sysfs-fs-f2fs

+17 −10
Original line number Diff line number Diff line
@@ -49,16 +49,23 @@ Contact: "Jaegeuk Kim" <jaegeuk.kim@samsung.com> 
Description:	Controls the in-place-update policy.

		updates in f2fs. User can set:



		====  =================

		0x01  F2FS_IPU_FORCE

		0x02  F2FS_IPU_SSR

		0x04  F2FS_IPU_UTIL

		0x08  F2FS_IPU_SSR_UTIL

		0x10  F2FS_IPU_FSYNC

		0x20  F2FS_IPU_ASYNC

		0x40  F2FS_IPU_NOCACHE

		0x80  F2FS_IPU_HONOR_OPU_WRITE

		====  =================

		===== =============== ===================================================

		value policy          description

		0x00  DISABLE         disable IPU(=default option in LFS mode)

		0x01  FORCE           all the time

		0x02  SSR             if SSR mode is activated

		0x04  UTIL            if FS utilization is over threashold

		0x08  SSR_UTIL        if SSR mode is activated and FS utilization is over

		                      threashold

		0x10  FSYNC           activated in fsync path only for high performance

		                      flash storages. IPU will be triggered only if the

		                      # of dirty pages over min_fsync_blocks.

		                      (=default option)

		0x20  ASYNC           do IPU given by asynchronous write requests

		0x40  NOCACHE         disable IPU bio cache

		0x80  HONOR_OPU_WRITE use OPU write prior to IPU write if inode has

		                      FI_OPU_WRITE flag

		===== =============== ===================================================



		Refer segment.h for details.