mirror of
https://gitlab.com/qemu-project/qemu
synced 2024-11-05 20:35:44 +00:00
78a33ab587
Minimal realization: only one extent in server answer is supported. Flag NBD_CMD_FLAG_REQ_ONE is used to force this behavior. Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Message-Id: <20180312152126.286890-6-vsementsov@virtuozzo.com> Reviewed-by: Eric Blake <eblake@redhat.com> [eblake: grammar tweaks, fix min_block check and 32-bit cap, use -1 instead of errno on failure in nbd_negotiate_simple_meta_context, ensure that block status makes progress on success] Signed-off-by: Eric Blake <eblake@redhat.com>
70 lines
2.4 KiB
C
70 lines
2.4 KiB
C
#ifndef NBD_CLIENT_H
|
|
#define NBD_CLIENT_H
|
|
|
|
#include "qemu-common.h"
|
|
#include "block/nbd.h"
|
|
#include "block/block_int.h"
|
|
#include "io/channel-socket.h"
|
|
|
|
/* #define DEBUG_NBD */
|
|
|
|
#if defined(DEBUG_NBD)
|
|
#define logout(fmt, ...) \
|
|
fprintf(stderr, "nbd\t%-24s" fmt, __func__, ##__VA_ARGS__)
|
|
#else
|
|
#define logout(fmt, ...) ((void)0)
|
|
#endif
|
|
|
|
#define MAX_NBD_REQUESTS 16
|
|
|
|
typedef struct {
|
|
Coroutine *coroutine;
|
|
uint64_t offset; /* original offset of the request */
|
|
bool receiving; /* waiting for read_reply_co? */
|
|
} NBDClientRequest;
|
|
|
|
typedef struct NBDClientSession {
|
|
QIOChannelSocket *sioc; /* The master data channel */
|
|
QIOChannel *ioc; /* The current I/O channel which may differ (eg TLS) */
|
|
NBDExportInfo info;
|
|
|
|
CoMutex send_mutex;
|
|
CoQueue free_sema;
|
|
Coroutine *read_reply_co;
|
|
int in_flight;
|
|
|
|
NBDClientRequest requests[MAX_NBD_REQUESTS];
|
|
NBDReply reply;
|
|
bool quit;
|
|
} NBDClientSession;
|
|
|
|
NBDClientSession *nbd_get_client_session(BlockDriverState *bs);
|
|
|
|
int nbd_client_init(BlockDriverState *bs,
|
|
QIOChannelSocket *sock,
|
|
const char *export_name,
|
|
QCryptoTLSCreds *tlscreds,
|
|
const char *hostname,
|
|
Error **errp);
|
|
void nbd_client_close(BlockDriverState *bs);
|
|
|
|
int nbd_client_co_pdiscard(BlockDriverState *bs, int64_t offset, int bytes);
|
|
int nbd_client_co_flush(BlockDriverState *bs);
|
|
int nbd_client_co_pwritev(BlockDriverState *bs, uint64_t offset,
|
|
uint64_t bytes, QEMUIOVector *qiov, int flags);
|
|
int nbd_client_co_pwrite_zeroes(BlockDriverState *bs, int64_t offset,
|
|
int bytes, BdrvRequestFlags flags);
|
|
int nbd_client_co_preadv(BlockDriverState *bs, uint64_t offset,
|
|
uint64_t bytes, QEMUIOVector *qiov, int flags);
|
|
|
|
void nbd_client_detach_aio_context(BlockDriverState *bs);
|
|
void nbd_client_attach_aio_context(BlockDriverState *bs,
|
|
AioContext *new_context);
|
|
|
|
int coroutine_fn nbd_client_co_block_status(BlockDriverState *bs,
|
|
bool want_zero,
|
|
int64_t offset, int64_t bytes,
|
|
int64_t *pnum, int64_t *map,
|
|
BlockDriverState **file);
|
|
|
|
#endif /* NBD_CLIENT_H */
|