mirror of https://gitee.com/openkylin/qemu.git
101 lines
3.3 KiB
C
101 lines
3.3 KiB
C
/*
|
|
* 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"
|
|
|
|
struct nbd_request {
|
|
uint32_t magic;
|
|
uint32_t type;
|
|
uint64_t handle;
|
|
uint64_t from;
|
|
uint32_t len;
|
|
} QEMU_PACKED;
|
|
|
|
struct nbd_reply {
|
|
uint32_t magic;
|
|
uint32_t error;
|
|
uint64_t handle;
|
|
} QEMU_PACKED;
|
|
|
|
#define NBD_FLAG_HAS_FLAGS (1 << 0) /* Flags are there */
|
|
#define NBD_FLAG_READ_ONLY (1 << 1) /* Device is read-only */
|
|
#define NBD_FLAG_SEND_FLUSH (1 << 2) /* Send FLUSH */
|
|
#define NBD_FLAG_SEND_FUA (1 << 3) /* Send FUA (Force Unit Access) */
|
|
#define NBD_FLAG_ROTATIONAL (1 << 4) /* Use elevator algorithm - rotational media */
|
|
#define NBD_FLAG_SEND_TRIM (1 << 5) /* Send TRIM (discard) */
|
|
|
|
#define NBD_CMD_MASK_COMMAND 0x0000ffff
|
|
#define NBD_CMD_FLAG_FUA (1 << 16)
|
|
|
|
enum {
|
|
NBD_CMD_READ = 0,
|
|
NBD_CMD_WRITE = 1,
|
|
NBD_CMD_DISC = 2,
|
|
NBD_CMD_FLUSH = 3,
|
|
NBD_CMD_TRIM = 4
|
|
};
|
|
|
|
#define NBD_DEFAULT_PORT 10809
|
|
|
|
#define NBD_BUFFER_SIZE (1024*1024)
|
|
|
|
ssize_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_receive_negotiate(int csock, const char *name, uint32_t *flags,
|
|
off_t *size, size_t *blocksize);
|
|
int nbd_init(int fd, int csock, uint32_t flags, off_t size, size_t blocksize);
|
|
ssize_t nbd_send_request(int csock, struct nbd_request *request);
|
|
ssize_t nbd_receive_reply(int csock, struct nbd_reply *reply);
|
|
int nbd_client(int fd);
|
|
int nbd_disconnect(int fd);
|
|
|
|
typedef struct NBDExport NBDExport;
|
|
typedef struct NBDClient NBDClient;
|
|
|
|
NBDExport *nbd_export_new(BlockDriverState *bs, off_t dev_offset,
|
|
off_t size, uint32_t nbdflags,
|
|
void (*close)(NBDExport *));
|
|
void nbd_export_close(NBDExport *exp);
|
|
void nbd_export_get(NBDExport *exp);
|
|
void nbd_export_put(NBDExport *exp);
|
|
|
|
BlockDriverState *nbd_export_get_blockdev(NBDExport *exp);
|
|
|
|
NBDExport *nbd_export_find(const char *name);
|
|
void nbd_export_set_name(NBDExport *exp, const char *name);
|
|
void nbd_export_close_all(void);
|
|
|
|
NBDClient *nbd_client_new(NBDExport *exp, int csock,
|
|
void (*close)(NBDClient *));
|
|
void nbd_client_close(NBDClient *client);
|
|
void nbd_client_get(NBDClient *client);
|
|
void nbd_client_put(NBDClient *client);
|
|
|
|
#endif
|