diff --git a/block/bdev.c b/block/bdev.c
index ed022f8c48c7..e0bace1a6c27 100644
--- a/block/bdev.c
+++ b/block/bdev.c
@@ -860,11 +860,6 @@ void blkdev_put_no_open(struct block_device *bdev)
 	put_device(&bdev->bd_device);
 }
 
-static bool bdev_writes_blocked(struct block_device *bdev)
-{
-	return bdev->bd_writers < 0;
-}
-
 static void bdev_block_writes(struct block_device *bdev)
 {
 	bdev->bd_writers--;
diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index 0000913f7efc..34bbbf3bcb36 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -1239,6 +1239,22 @@ loop_set_status(struct loop_device *lo, const struct loop_info64 *info)
 		goto out_unlock;
 	}
 
+#ifndef CONFIG_BLK_DEV_WRITE_MOUNTED
+	/*
+	 * Changing lo_offset or shrinking lo_sizelimit on a mounted
+	 * device is equivalent to modifying the block device contents.
+	 * Block this if writes to the device are blocked.
+	 */
+	if ((lo->lo_offset != info->lo_offset ||
+	     (info->lo_sizelimit &&
+	      (lo->lo_sizelimit == 0 ||
+	       info->lo_sizelimit < lo->lo_sizelimit))) &&
+	    bdev_writes_blocked(lo->lo_device)) {
+		err = -EBUSY;
+		goto out_unlock;
+	}
+#endif
+
 	if (lo->lo_offset != info->lo_offset ||
 	    lo->lo_sizelimit != info->lo_sizelimit) {
 		size_changed = true;
diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h
index 8808ee76e73c..82ece8737b85 100644
--- a/include/linux/blk_types.h
+++ b/include/linux/blk_types.h
@@ -84,6 +84,11 @@ struct block_device {
 #define bdev_whole(_bdev) \
 	((_bdev)->bd_disk->part0)
 
+static inline bool bdev_writes_blocked(struct block_device *bdev)
+{
+	return bdev->bd_writers < 0;
+}
+
 #define dev_to_bdev(device) \
 	container_of((device), struct block_device, bd_device)