LXR qemu/nbd.h

   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
  27struct nbd_request {
  28    uint32_t type;
  29    uint64_t handle;
  30    uint64_t from;
  31    uint32_t len;
  32};
  33
  34struct nbd_reply {
  35    uint32_t error;
  36    uint64_t handle;
  37};
  38
  39enum {
  40    NBD_CMD_READ = 0,
  41    NBD_CMD_WRITE = 1,
  42    NBD_CMD_DISC = 2
  43};
  44
  45size_t nbd_wr_sync(int fd, void *buffer, size_t size, bool do_read);
  46int tcp_socket_outgoing(const char *address, uint16_t port);
  47int tcp_socket_incoming(const char *address, uint16_t port);
  48int unix_socket_outgoing(const char *path);
  49int unix_socket_incoming(const char *path);
  50
  51int nbd_negotiate(int csock, off_t size);
  52int nbd_receive_negotiate(int csock, off_t *size, size_t *blocksize);
  53int nbd_init(int fd, int csock, off_t size, size_t blocksize);
  54int nbd_send_request(int csock, struct nbd_request *request);
  55int nbd_receive_reply(int csock, struct nbd_reply *reply);
  56int nbd_trip(BlockDriverState *bs, int csock, off_t size, uint64_t dev_offset,
  57             off_t *offset, bool readonly, uint8_t *data, int data_size);
  58int nbd_client(int fd, int csock);
  59int nbd_disconnect(int fd);
  60
  61#endif
  62