root / nbd.h @ 463ce4ae
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/*
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* Copyright (C) 2005 Anthony Liguori <anthony@codemonkey.ws>
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*
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* Network Block Device
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; under version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef NBD_H
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#define NBD_H
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#include <sys/types.h> |
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#include "qemu-common.h" |
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struct nbd_request {
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uint32_t magic; |
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uint32_t type; |
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uint64_t handle; |
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uint64_t from; |
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uint32_t len; |
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} QEMU_PACKED; |
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struct nbd_reply {
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uint32_t magic; |
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uint32_t error; |
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uint64_t handle; |
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} QEMU_PACKED; |
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#define NBD_FLAG_HAS_FLAGS (1 << 0) /* Flags are there */ |
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#define NBD_FLAG_READ_ONLY (1 << 1) /* Device is read-only */ |
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#define NBD_FLAG_SEND_FLUSH (1 << 2) /* Send FLUSH */ |
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#define NBD_FLAG_SEND_FUA (1 << 3) /* Send FUA (Force Unit Access) */ |
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#define NBD_FLAG_ROTATIONAL (1 << 4) /* Use elevator algorithm - rotational media */ |
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#define NBD_FLAG_SEND_TRIM (1 << 5) /* Send TRIM (discard) */ |
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#define NBD_CMD_MASK_COMMAND 0x0000ffff |
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#define NBD_CMD_FLAG_FUA (1 << 16) |
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enum {
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NBD_CMD_READ = 0,
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NBD_CMD_WRITE = 1,
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NBD_CMD_DISC = 2,
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NBD_CMD_FLUSH = 3,
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NBD_CMD_TRIM = 4
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}; |
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#define NBD_DEFAULT_PORT 10809 |
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size_t nbd_wr_sync(int fd, void *buffer, size_t size, bool do_read); |
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int tcp_socket_outgoing(const char *address, uint16_t port); |
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int tcp_socket_incoming(const char *address, uint16_t port); |
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int tcp_socket_outgoing_spec(const char *address_and_port); |
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int tcp_socket_incoming_spec(const char *address_and_port); |
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int unix_socket_outgoing(const char *path); |
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int unix_socket_incoming(const char *path); |
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int nbd_negotiate(int csock, off_t size, uint32_t flags); |
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int nbd_receive_negotiate(int csock, const char *name, uint32_t *flags, |
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off_t *size, size_t *blocksize); |
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int nbd_init(int fd, int csock, uint32_t flags, off_t size, size_t blocksize); |
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int nbd_send_request(int csock, struct nbd_request *request); |
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int nbd_receive_reply(int csock, struct nbd_reply *reply); |
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int nbd_trip(BlockDriverState *bs, int csock, off_t size, uint64_t dev_offset, |
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off_t *offset, uint32_t nbdflags, uint8_t *data, int data_size);
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int nbd_client(int fd); |
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int nbd_disconnect(int fd); |
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#endif
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