ssize_t nbd_send_request(QIOChannel *ioc, struct nbd_request *request) { uint8_t buf[NBD_REQUEST_SIZE]; ssize_t ret; TRACE("Sending request to server: " "{ .from = %" PRIu64", .len = %" PRIu32 ", .handle = %" PRIu64 ", .type=%" PRIu32 " }", request->from, request->len, request->handle, request->type); stl_be_p(buf, NBD_REQUEST_MAGIC); stl_be_p(buf + 4, request->type); stq_be_p(buf + 8, request->handle); stq_be_p(buf + 16, request->from); stl_be_p(buf + 24, request->len); ret = write_sync(ioc, buf, sizeof(buf)); if (ret < 0) { return ret; } if (ret != sizeof(buf)) { LOG("writing to socket failed"); return -EINVAL; } return 0; }