f2fs: add nobarrier mount option
This patch adds a mount option, nobarrier, in f2fs.
The assumption in here is that file system keeps the IO ordering, but
doesn't care about cache flushes inside the storages.
Reviewed-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Conflicts:
Documentation/filesystems/f2fs.txt
Change-Id: I2947cb10128efcf5647eff432d5fd959b2d2f5bc
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 3461bc1..c5eeb44 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -266,6 +266,9 @@
struct flush_cmd_control *fcc = SM_I(sbi)->cmd_control_info;
struct flush_cmd cmd;
+ if (test_opt(sbi, NOBARRIER))
+ return 0;
+
if (!test_opt(sbi, FLUSH_MERGE))
return blkdev_issue_flush(sbi->sb->s_bdev, GFP_KERNEL, NULL);