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, write to the Free Software

    17  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

    18  */

    19 

    20 #ifndef NBD_H

    21 #define NBD_H

    22 

    23 #include <sys/types.h>

    24 #include <stdbool.h>

    25 

    26 #include <qemu-common.h>

    27 #include "block_int.h"

    28 

    29 struct nbd_request {

    30     uint32_t type;

    31     uint64_t handle;

    32     uint64_t from;

    33     uint32_t len;

    34 };

    35 

    36 struct nbd_reply {

    37     uint32_t error;

    38     uint64_t handle;

    39 };

    40 

    41 enum {

    42     NBD_CMD_READ = 0,

    43     NBD_CMD_WRITE = 1,

    44     NBD_CMD_DISC = 2

    45 };

    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, off_t *size, size_t *blocksize);

    55 int nbd_init(int fd, int csock, off_t size, size_t blocksize);

    56 int nbd_send_request(int csock, struct nbd_request *request);

    57 int nbd_receive_reply(int csock, struct nbd_reply *reply);

    58 int nbd_trip(BlockDriverState *bs, int csock, off_t size, uint64_t dev_offset,

    59              off_t *offset, bool readonly, uint8_t *data, int data_size);

    60 int nbd_client(int fd, int csock);

    61 int nbd_disconnect(int fd);

    62 

    63 #endif