dev->ops.write = __block_write;
dev->ops.write_page = __block_write_page;
dev->ops.read = __block_read;
dev->ops.read_page = __block_read_page;
bdev->dev = dev;
dev->ops.write = __block_write;
dev->ops.write_page = __block_write_page;
dev->ops.read = __block_read;
dev->ops.read_page = __block_read_page;
bdev->dev = dev;