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| author | Junling Zheng <zhengjunling@huawei.com> | 2018-03-07 05:07:49 +0100 |
|---|---|---|
| committer | Jaegeuk Kim <jaegeuk@kernel.org> | 2018-03-17 05:57:28 +0100 |
| commit | 93cf93f17c8ef7c03d828914eaef88d8e585490d (patch) | |
| tree | c6b82ef66fd921f65c8b15dade3dec74395d09db /Documentation/filesystems | |
| parent | f2fs: fix to restore old mount option in ->remount_fs (diff) | |
| download | linux-93cf93f17c8ef7c03d828914eaef88d8e585490d.tar.xz linux-93cf93f17c8ef7c03d828914eaef88d8e585490d.zip | |
f2fs: introduce mount option for fsync mode
Commit "0a007b97aad6"(f2fs: recover directory operations by fsync)
fixed xfstest generic/342 case, but it also increased the written
data and caused the performance degradation. In most cases, there's
no need to do so heavy fsync actually.
So we introduce new mount option "fsync_mode={posix,strict}" to
control the policy of fsync. "fsync_mode=posix" is set by default,
and means that f2fs uses a light fsync, which follows POSIX semantics.
And "fsync_mode=strict" means that it's a heavy fsync, which behaves
in line with xfs, ext4 and btrfs, where generic/342 will pass, but
the performance will regress.
Signed-off-by: Junling Zheng <zhengjunling@huawei.com>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Diffstat (limited to 'Documentation/filesystems')
| -rw-r--r-- | Documentation/filesystems/f2fs.txt | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/Documentation/filesystems/f2fs.txt b/Documentation/filesystems/f2fs.txt index 0409c47584ea..514e44983a8e 100644 --- a/Documentation/filesystems/f2fs.txt +++ b/Documentation/filesystems/f2fs.txt @@ -182,6 +182,13 @@ whint_mode=%s Control which write hints are passed down to block passes down hints with its policy. alloc_mode=%s Adjust block allocation policy, which supports "reuse" and "default". +fsync_mode=%s Control the policy of fsync. Currently supports "posix" + and "strict". In "posix" mode, which is default, fsync + will follow POSIX semantics and does a light operation + to improve the filesystem performance. In "strict" mode, + fsync will be heavy and behaves in line with xfs, ext4 + and btrfs, where xfstest generic/342 will pass, but the + performance will regress. ================================================================================ DEBUGFS ENTRIES |