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68396ea @rmustacc Initial commit of d32e8d0b8d9e0ef7cf7ab2e74548982972789dfc from qemu-kvm
rmustacc authored
1 /*
2 * Copyright (C) 2005 Anthony Liguori <anthony@codemonkey.ws>
3 *
4 * Network Block Device
5 *
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.
9 *
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.
14 *
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/>.
17 */
18
19 #ifndef NBD_H
20 #define NBD_H
21
22 #include <sys/types.h>
23
24 #include <qemu-common.h>
25 #include "block_int.h"
26
27 struct nbd_request {
28 uint32_t type;
29 uint64_t handle;
30 uint64_t from;
31 uint32_t len;
32 };
33
34 struct nbd_reply {
35 uint32_t error;
36 uint64_t handle;
37 };
38
39 enum {
40 NBD_CMD_READ = 0,
41 NBD_CMD_WRITE = 1,
42 NBD_CMD_DISC = 2
43 };
44
45 #define NBD_DEFAULT_PORT 10809
46
47 size_t nbd_wr_sync(int fd, void *buffer, size_t size, bool do_read);
48 int tcp_socket_outgoing(const char *address, uint16_t port);
49 int tcp_socket_incoming(const char *address, uint16_t port);
50 int unix_socket_outgoing(const char *path);
51 int unix_socket_incoming(const char *path);
52
53 int nbd_negotiate(int csock, off_t size);
54 int nbd_receive_negotiate(int csock, const char *name, uint32_t *flags,
55 off_t *size, size_t *blocksize);
56 int nbd_init(int fd, int csock, off_t size, size_t blocksize);
57 int nbd_send_request(int csock, struct nbd_request *request);
58 int nbd_receive_reply(int csock, struct nbd_reply *reply);
59 int nbd_trip(BlockDriverState *bs, int csock, off_t size, uint64_t dev_offset,
60 off_t *offset, bool readonly, uint8_t *data, int data_size);
61 int nbd_client(int fd);
62 int nbd_disconnect(int fd);
63
64 #endif
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