From 0bdeb167c843f33fffa3bd046b9e9e9eb8ff01ea Mon Sep 17 00:00:00 2001 From: Junling Zheng Date: Wed, 7 Mar 2018 12:07:49 +0800 Subject: 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 Reviewed-by: Chao Yu Signed-off-by: Jaegeuk Kim --- Documentation/filesystems/f2fs.txt | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'Documentation/filesystems') diff --git a/Documentation/filesystems/f2fs.txt b/Documentation/filesystems/f2fs.txt index 579c1119131d..fb92e6f25adf 100644 --- a/Documentation/filesystems/f2fs.txt +++ b/Documentation/filesystems/f2fs.txt @@ -180,6 +180,13 @@ 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 -- cgit v1.2.3