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

Description:	Controls the in-place-update policy.

		updates in f2fs. User can set:

		updates in f2fs. User can set:





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

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

		0x01  F2FS_IPU_FORCE

		value policy          description

		0x02  F2FS_IPU_SSR

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

		0x04  F2FS_IPU_UTIL

		0x01  FORCE           all the time

		0x08  F2FS_IPU_SSR_UTIL

		0x02  SSR             if SSR mode is activated

		0x10  F2FS_IPU_FSYNC

		0x04  UTIL            if FS utilization is over threashold

		0x20  F2FS_IPU_ASYNC

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

		0x40  F2FS_IPU_NOCACHE

		                      threashold

		0x80  F2FS_IPU_HONOR_OPU_WRITE

		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.

		Refer segment.h for details.