From: Theodore Ts'o <tytso@mit.edu>
Date: Mon, 23 Nov 2009 12:24:57 +0000 (-0500)
Subject: ext4: avoid issuing unnecessary barriers
X-Git-Tag: firefly_0821_release~11625^2~653
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=43e932d3116f3a74f1b5ff0a38cca5e0bac1099a;p=firefly-linux-kernel-4.4.55.git

ext4: avoid issuing unnecessary barriers

(cherry picked from commit 6b17d902fdd241adfa4ce780df20547b28bf5801)

We don't to issue an I/O barrier on an error or if we force commit
because we are doing data journaling.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Cc: Jan Kara <jack@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

diff --git a/fs/ext4/fsync.c b/fs/ext4/fsync.c
index 2b1531266ee2..a3c25076aef1 100644
--- a/fs/ext4/fsync.c
+++ b/fs/ext4/fsync.c
@@ -60,7 +60,7 @@ int ext4_sync_file(struct file *file, struct dentry *dentry, int datasync)
 
 	ret = flush_aio_dio_completed_IO(inode);
 	if (ret < 0)
-		goto out;
+		return ret;
 	/*
 	 * data=writeback:
 	 *  The caller's filemap_fdatawrite()/wait will sync the data.
@@ -79,10 +79,8 @@ int ext4_sync_file(struct file *file, struct dentry *dentry, int datasync)
 	 *  (they were dirtied by commit).  But that's OK - the blocks are
 	 *  safe in-journal, which is all fsync() needs to ensure.
 	 */
-	if (ext4_should_journal_data(inode)) {
-		ret = ext4_force_commit(inode->i_sb);
-		goto out;
-	}
+	if (ext4_should_journal_data(inode))
+		return ext4_force_commit(inode->i_sb);
 
 	if (!journal)
 		ret = sync_mapping_buffers(inode->i_mapping);