From: Jan Kara <jack@suse.cz>

When write in ext3_quota_write() fails, we have to properly release
i_mutex.  One error path has been missing the unlock...

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 fs/ext3/super.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff -puN fs/ext3/super.c~ext3-add-missing-unlock-to-error-path-in-ext3_quota_write fs/ext3/super.c
--- a/fs/ext3/super.c~ext3-add-missing-unlock-to-error-path-in-ext3_quota_write
+++ a/fs/ext3/super.c
@@ -2875,8 +2875,10 @@ static ssize_t ext3_quota_write(struct s
 		blk++;
 	}
 out:
-	if (len == towrite)
+	if (len == towrite) {
+		mutex_unlock(&inode->i_mutex);
 		return err;
+	}
 	if (inode->i_size < off+len-towrite) {
 		i_size_write(inode, off+len-towrite);
 		EXT3_I(inode)->i_disksize = inode->i_size;
_