diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 486a641..463b52b 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -2419,6 +2419,22 @@
 				err = -EROFS;
 				goto restore_opts;
 			}
+
+			/*
+			 * If we have an unprocessed orphan list hanging
+			 * around from a previously readonly bdev mount,
+			 * require a full umount/remount for now.
+			 */
+			if (es->s_last_orphan) {
+				printk(KERN_WARNING "EXT4-fs: %s: couldn't "
+				       "remount RDWR because of unprocessed "
+				       "orphan inode list.  Please "
+				       "umount/remount instead.\n",
+				       sb->s_id);
+				err = -EINVAL;
+				goto restore_opts;
+			}
+
 			/*
 			 * Mounting a RDONLY partition read-write, so reread
 			 * and store the current valid flag.  (It may have