--- a/drivers/mtd/devices/block2mtd.c
+++ b/drivers/mtd/devices/block2mtd.c
@@ -247,6 +247,53 @@ static void block2mtd_sync(struct mtd_in
 	return;
 }
 
+static int _open_bdev(struct block2mtd_dev *dev)
+{
+	const fmode_t mode = FMODE_READ | FMODE_WRITE | FMODE_EXCL;
+	struct block_device *bdev;
+
+	/* Get a handle on the device */
+	bdev = blkdev_get_by_path(dev->devname, mode, dev);
+#ifndef MODULE
+	if (IS_ERR(bdev)) {
+		dev_t devt;
+
+		/* We might not have rootfs mounted at this point. Try
+		   to resolve the device name by other means. */
+
+		wait_for_device_probe();
+		devt = name_to_dev_t(dev->devname);
+		if (devt)
+			bdev = blkdev_get_by_dev(devt, mode, dev);
+	}
+#endif
+
+	if (IS_ERR(bdev)) {
+		ERROR("error: cannot open device %s", dev->devname);
+		return 1;
+	}
+	dev->blkdev = bdev;
+
+	if (MAJOR(bdev->bd_dev) == MTD_BLOCK_MAJOR) {
+		ERROR("attempting to use an MTD device as a block device");
+		return 1;
+	}
+
+	return 0;
+}
+
+static void _close_bdev(struct block2mtd_dev *dev)
+{
+	struct block_device *bdev;
+
+	if (!dev->blkdev)
+		return;
+
+	bdev = dev->blkdev;
+	invalidate_mapping_pages(dev->blkdev->bd_inode->i_mapping, 0, -1);
+	blkdev_put(dev->blkdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
+	dev->blkdev = NULL;
+}
 
 static void block2mtd_free_device(struct block2mtd_dev *dev)
 {