--- linux-stage/fs/ext4/mballoc.c	2016-11-25 15:31:40.353249364 +0530
+++ linux-stage.orig/fs/ext4/mballoc.c	2016-11-25 15:35:07.816249363 +0530
@@ -3369,6 +3369,11 @@
 	unsigned short max = EXT4_BLOCKS_PER_GROUP(sb);
 	unsigned short i, first, free = 0;
 
+#ifdef HAVE_CLEAR_RDONLY_ON_PUT
+	/* be quiet if readonly device */
+	if (dev_check_rdonly(sb->s_bdev))
+		return 0;
+#endif
 	i = mb_find_next_zero_bit(bitmap, max, 0);
 
 	while (i < max) {
@@ -3750,6 +3755,13 @@
 		bit = next + 1;
 	}
 
+#ifdef HAVE_CLEAR_RDONLY_ON_PUT
+	/* be quiet if readonly device */
+	if (dev_check_rdonly(sb->s_bdev)) {
+		atomic_add(free, &sbi->s_mb_discarded);
+		return err;
+	}
+#endif
 	/* "free < pa->pa_free" means we maybe double alloc the same blocks,
 	 * otherwise maybe leave some free blocks unavailable, no need to BUG.*/
 	if ((free > pa->pa_free && !pa->pa_error) || (free < pa->pa_free)) {