--- linux/fs/ext/blkdev.c	2018/04/24 18:12:21	1.1.1.2
+++ linux/fs/ext/blkdev.c	2018/04/24 18:14:20	1.1.1.3
@@ -62,6 +62,6 @@ struct inode_operations ext_blkdev_inode
 	NULL,			/* rename */
 	NULL,			/* readlink */
 	NULL,			/* follow_link */
-	ext_bmap,		/* bmap */
-	ext_truncate		/* truncate */
+	NULL,			/* bmap */
+	NULL			/* truncate */
 };