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Diffstat (limited to 'qemu/include/block/nbd.h')
| -rw-r--r-- | qemu/include/block/nbd.h | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/qemu/include/block/nbd.h b/qemu/include/block/nbd.h new file mode 100644 index 000000000..65f409d80 --- /dev/null +++ b/qemu/include/block/nbd.h @@ -0,0 +1,106 @@ +/* + * 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 "qemu/option.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) */ + +/* New-style global flags. */ +#define NBD_FLAG_FIXED_NEWSTYLE (1 << 0) /* Fixed newstyle protocol. */ + +/* New-style client flags. */ +#define NBD_FLAG_C_FIXED_NEWSTYLE (1 << 0) /* Fixed newstyle protocol. */ + +/* Reply types. */ +#define NBD_REP_ACK (1) /* Data sending finished. */ +#define NBD_REP_SERVER (2) /* Export description. */ +#define NBD_REP_ERR_UNSUP ((UINT32_C(1) << 31) | 1) /* Unknown option. */ +#define NBD_REP_ERR_INVALID ((UINT32_C(1) << 31) | 3) /* Invalid length. */ + +#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 + +/* Maximum size of a single READ/WRITE data buffer */ +#define NBD_MAX_BUFFER_SIZE (32 * 1024 * 1024) + +ssize_t nbd_wr_sync(int fd, void *buffer, size_t size, bool do_read); +int nbd_receive_negotiate(int csock, const char *name, uint32_t *flags, + off_t *size, Error **errp); +int nbd_init(int fd, int csock, uint32_t flags, off_t size); +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(BlockBackend *blk, off_t dev_offset, off_t size, + uint32_t nbdflags, void (*close)(NBDExport *), + Error **errp); +void nbd_export_close(NBDExport *exp); +void nbd_export_get(NBDExport *exp); +void nbd_export_put(NBDExport *exp); + +BlockBackend *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_get(NBDClient *client); +void nbd_client_put(NBDClient *client); + +#endif |