[PATCH V4 2/2] fs/ext4/fsync.c: generic_file_fsync call based on barrier flag

From: Fabian Frederick
Date: Sat May 10 2014 - 13:06:27 EST


generic_file_fsync has been updated to issue a flush for
older filesystems.

This patch tests for barrier flag in ext4 mount flags
and calls the right function.

Suggested-by: Jan Kara <jack@xxxxxxx>
Suggested-by: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Cc: Jan Kara <jack@xxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Cc: Alexander Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: "Theodore Ts'o" <tytso@xxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Fabian Frederick <fabf@xxxxxxxxx>
---
fs/ext4/fsync.c | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/fs/ext4/fsync.c b/fs/ext4/fsync.c
index a8bc47f..fa82c0a 100644
--- a/fs/ext4/fsync.c
+++ b/fs/ext4/fsync.c
@@ -108,6 +108,10 @@ int ext4_sync_file(struct file *file, loff_t start, loff_t end, int datasync)

if (!journal) {
ret = generic_file_fsync(file, start, end, datasync);
+ if (test_opt(inode->i_sb, BARRIER))
+ ret = generic_file_fsync(file, start, end, datasync);
+ else
+ ret = __generic_file_fsync(file, start, end, datasync);
if (!ret && !hlist_empty(&inode->i_dentry))
ret = ext4_sync_parent(inode);
goto out;
--
1.8.4.5

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