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/*

 *  Copyright (C) 2005  Anthony Liguori <anthony@codemonkey.ws>

 *

 *  Network Block Device

 *

 *  This program is free software; you can redistribute it and/or modify

 *  it under the terms of the GNU General Public License as published by

 *  the Free Software Foundation; under version 2 of the License.

 *

 *  This program is distributed in the hope that it will be useful,

 *  but WITHOUT ANY WARRANTY; without even the implied warranty of

 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 *  GNU General Public License for more details.

 *

 *  You should have received a copy of the GNU General Public License

 *  along with this program; if not, see <http://www.gnu.org/licenses/>.

 */

#ifndef NBD_H

#define NBD_H

#include <sys/types.h>

#include <qemu-common.h>

#include "block_int.h"

struct nbd_request {

    uint32_t magic;

    uint32_t type;

    uint64_t handle;

    uint64_t from;

    uint32_t len;

} __attribute__ ((__packed__));

struct nbd_reply {

    uint32_t magic;

    uint32_t error;

    uint64_t handle;

} __attribute__ ((__packed__));

enum {

    NBD_CMD_READ = 0,

    NBD_CMD_WRITE = 1,

    NBD_CMD_DISC = 2

};

#define NBD_DEFAULT_PORT        10809

size_t nbd_wr_sync(int fd, void *buffer, size_t size, bool do_read);

int tcp_socket_outgoing(const char *address, uint16_t port);

int tcp_socket_incoming(const char *address, uint16_t port);

int tcp_socket_outgoing_spec(const char *address_and_port);

int tcp_socket_incoming_spec(const char *address_and_port);

int unix_socket_outgoing(const char *path);

int unix_socket_incoming(const char *path);

int nbd_negotiate(int csock, off_t size);

int nbd_receive_negotiate(int csock, const char *name, uint32_t *flags,

                          off_t *size, size_t *blocksize);

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

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

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

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

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

int nbd_client(int fd);

int nbd_disconnect(int fd);

#endif