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f2fs: add fsync_mode=nobarrier for non-atomic files 

For non-atomic files, this patch adds an option to give nobarrier which
doesn't issue flush commands to the device.

Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Jaegeuk Kim 2018-05-25 18:02:58 -07:00
parent 9a997188ff
commit d6290814b0
4 changed files with 15 additions and 8 deletions
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16
Documentation/filesystems/f2fs.txt
View File

@ -182,13 +182,15 @@ 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.
fsync_mode=%s Control the policy of fsync. Currently supports "posix",
"strict", and "nobarrier". 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. "nobarrier" is
based on "posix", but doesn't issue flush command for
non-atomic files likewise "nobarrier" mount option.
test_dummy_encryption Enable dummy encryption, which provides a fake fscrypt
context. The fake fscrypt context is used by xfstests.

1
fs/f2fs/f2fs.h
View File

@ -1082,6 +1082,7 @@ enum {
enum fsync_mode {
FSYNC_MODE_POSIX, /* fsync follows posix semantics */
FSYNC_MODE_STRICT, /* fsync behaves in line with ext4 */
FSYNC_MODE_NOBARRIER, /* fsync behaves nobarrier based on posix */
};
#ifdef CONFIG_F2FS_FS_ENCRYPTION

2
fs/f2fs/file.c
View File

@ -306,7 +306,7 @@ sync_nodes:
remove_ino_entry(sbi, ino, APPEND_INO);
clear_inode_flag(inode, FI_APPEND_WRITE);
flush_out:
if (!atomic)
if (!atomic && F2FS_OPTION(sbi).fsync_mode != FSYNC_MODE_NOBARRIER)
ret = f2fs_issue_flush(sbi, inode->i_ino);
if (!ret) {
remove_ino_entry(sbi, ino, UPDATE_INO);

4
fs/f2fs/super.c
View File

@ -740,6 +740,10 @@ static int parse_options(struct super_block *sb, char *options)
} else if (strlen(name) == 6 &&
!strncmp(name, "strict", 6)) {
F2FS_OPTION(sbi).fsync_mode = FSYNC_MODE_STRICT;
} else if (strlen(name) == 9 &&
!strncmp(name, "nobarrier", 9)) {
F2FS_OPTION(sbi).fsync_mode =
FSYNC_MODE_NOBARRIER;
} else {
kfree(name);
return -EINVAL;