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f2fs: add missing description for ipu_policy node

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

Signed-off-by: Yangtao Li <frank.li@vivo.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Yangtao Li 2023-02-06 22:43:09 +08:00 committed by Jaegeuk Kim
parent c5bf834833
commit 9e615dbba4
1 changed files with 17 additions and 10 deletions
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27
Documentation/ABI/testing/sysfs-fs-f2fs
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@ -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.