diff --git a/[refs] b/[refs]
index 3116d469d571..b10fa62a62ac 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: d096ad0f79a782935d2e06ae8fb235e8c5397775
+refs/heads/master: 721e3eba21e43532e438652dd8f1fcdfce3187e7
diff --git a/trunk/fs/ext4/super.c b/trunk/fs/ext4/super.c
index 183ae3447f64..3d4fb81bacd5 100644
--- a/trunk/fs/ext4/super.c
+++ b/trunk/fs/ext4/super.c
@@ -2220,7 +2220,9 @@ static void ext4_orphan_cleanup(struct super_block *sb,
 				__func__, inode->i_ino, inode->i_size);
 			jbd_debug(2, "truncating inode %lu to %lld bytes\n",
 				  inode->i_ino, inode->i_size);
+			mutex_lock(&inode->i_mutex);
 			ext4_truncate(inode);
+			mutex_unlock(&inode->i_mutex);
 			nr_truncates++;
 		} else {
 			ext4_msg(sb, KERN_DEBUG,