f2fs: add sysfs node to control ra_pages for fadvise seq file

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fadvise() allows the user to expand the readahead window to double with
POSIX_FADV_SEQUENTIAL, now. But, in some use cases, it is not that
sufficient and we need to meet the need in a restricted way. We can
control the multiplier value of bdi device readahead between 2 (default)
and 256 for POSIX_FADV_SEQUENTIAL advise option.

Signed-off-by: Daeho Jeong <daehojeong@google.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

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Daeho Jeong 2021-08-02 21:22:45 -07:00 • committed by Jaegeuk Kim

parent 4f993264fe

commit 0f6b56ec95

5 changed files with 52 additions and 0 deletions

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6

Documentation/ABI/testing/sysfs-fs-f2fs

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5

fs/f2fs/f2fs.h

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30

fs/f2fs/file.c

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1

fs/f2fs/super.c

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10

fs/f2fs/sysfs.c

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