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f2fs: add a way to turn off ipu bio cache

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Setting 0x40 in /sys/fs/f2fs/dev/ipu_policy gives a way to turn off
bio cache, which is useufl to check whether block layer using hardware
encryption engine merges IOs correctly.

Reviewed-by: Chao Yu <[email protected]>
Signed-off-by: Jaegeuk Kim <[email protected]>
This commit is contained in:
Jaegeuk Kim 2020-01-06 16:43:09 -08:00 • committed by Jaegeuk Kim
commit e07cead0da
3 changed files with 6 additions and 3 deletions
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5
Documentation/filesystems/f2fs.txt
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@ -331,10 +331,11 @@ Files in /sys/fs/f2fs/<devname>
conducts. 32 sections is set by default.
ipu_policy This parameter controls the policy of in-place
updates in f2fs. There are five policies:
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.
0x10: F2FS_IPU_FSYNC, 0x40: F2FS_IPU_NOCACHE.
Refer segment.h for details.
min_ipu_util This parameter controls the threshold to trigger
in-place-updates. The number indicates percentage