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
  26 #include "block_int.h"
  27
  28 struct nbd_request {
  29     uint32_t magic;
  30     uint32_t type;
  31     uint64_t handle;
  32     uint64_t from;
  33     uint32_t len;
  34 } __attribute__ ((__packed__));
  35
  36 struct nbd_reply {
  37     uint32_t magic;
  38     uint32_t error;
  39     uint64_t handle;
  40 } __attribute__ ((__packed__));
  41
  42 enum {
  43     NBD_CMD_READ = 0,
  44     NBD_CMD_WRITE = 1,
  45     NBD_CMD_DISC = 2
  46 };
  47
  48 #define NBD_DEFAULT_PORT        10809
  49
  50 size_t nbd_wr_sync(int fd, void *buffer, size_t size, bool do_read);
  51 int tcp_socket_outgoing(const char *address, uint16_t port);
  52 int tcp_socket_incoming(const char *address, uint16_t port);
  53 int tcp_socket_outgoing_spec(const char *address_and_port);
  54 int tcp_socket_incoming_spec(const char *address_and_port);
  55 int unix_socket_outgoing(const char *path);
  56 int unix_socket_incoming(const char *path);
  57
  58 int nbd_negotiate(int csock, off_t size);
  59 int nbd_receive_negotiate(int csock, const char *name, uint32_t *flags,
  60                           off_t *size, size_t *blocksize);
  61 int nbd_init(int fd, int csock, off_t size, size_t blocksize);
  62 int nbd_send_request(int csock, struct nbd_request *request);
  63 int nbd_receive_reply(int csock, struct nbd_reply *reply);
  64 int nbd_trip(BlockDriverState *bs, int csock, off_t size, uint64_t dev_offset,
  65              off_t *offset, bool readonly, uint8_t *data, int data_size);
  66 int nbd_client(int fd);
  67 int nbd_disconnect(int fd);
  68
  69 #endif