NBD_CMD_WRITE
bool w = (type == NBD_CMD_WRITE);
if (type != NBD_CMD_READ && type != NBD_CMD_WRITE && type != NBD_CMD_DISC)
if (req->type == NBD_CMD_WRITE)
err = nbd_alloc_request(dev, &req, NBD_CMD_WRITE, position, *numbytes, data);