Disable preadv/pwritev support
[qemu-kvm/fedora.git] / nbd.h
blob5deac2915268b03bc6548c0cba955e62c9e1e69e
1 /*
2 * Copyright (C) 2005 Anthony Liguori <anthony@codemonkey.ws>
4 * Network Block Device
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; under version 2 of the License.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, see <http://www.gnu.org/licenses/>.
19 #ifndef NBD_H
20 #define NBD_H
22 #include <sys/types.h>
23 #include <stdbool.h>
25 #include <qemu-common.h>
26 #include "block_int.h"
28 struct nbd_request {
29 uint32_t type;
30 uint64_t handle;
31 uint64_t from;
32 uint32_t len;
35 struct nbd_reply {
36 uint32_t error;
37 uint64_t handle;
40 enum {
41 NBD_CMD_READ = 0,
42 NBD_CMD_WRITE = 1,
43 NBD_CMD_DISC = 2
46 size_t nbd_wr_sync(int fd, void *buffer, size_t size, bool do_read);
47 int tcp_socket_outgoing(const char *address, uint16_t port);
48 int tcp_socket_incoming(const char *address, uint16_t port);
49 int unix_socket_outgoing(const char *path);
50 int unix_socket_incoming(const char *path);
52 int nbd_negotiate(int csock, off_t size);
53 int nbd_receive_negotiate(int csock, off_t *size, size_t *blocksize);
54 int nbd_init(int fd, int csock, off_t size, size_t blocksize);
55 int nbd_send_request(int csock, struct nbd_request *request);
56 int nbd_receive_reply(int csock, struct nbd_reply *reply);
57 int nbd_trip(BlockDriverState *bs, int csock, off_t size, uint64_t dev_offset,
58 off_t *offset, bool readonly, uint8_t *data, int data_size);
59 int nbd_client(int fd, int csock);
60 int nbd_disconnect(int fd);
62 #endif