block/nbd-client.h

   1 #ifndef NBD_CLIENT_H
   2 #define NBD_CLIENT_H
   3
   4 #include "qemu-common.h"
   5 #include "block/nbd.h"
   6 #include "block/block_int.h"
   7 #include "io/channel-socket.h"
   8
   9 /* #define DEBUG_NBD */
  10
  11 #if defined(DEBUG_NBD)
  12 #define logout(fmt, ...) \
  13     fprintf(stderr, "nbd\t%-24s" fmt, __func__, ##__VA_ARGS__)
  14 #else
  15 #define logout(fmt, ...) ((void)0)
  16 #endif
  17
  18 #define MAX_NBD_REQUESTS    16
  19
  20 typedef struct {
  21     Coroutine *coroutine;
  22     uint64_t offset;        /* original offset of the request */
  23     bool receiving;         /* waiting for connection_co? */
  24 } NBDClientRequest;
  25
  26 typedef struct NBDClientSession {
  27     QIOChannelSocket *sioc; /* The master data channel */
  28     QIOChannel *ioc; /* The current I/O channel which may differ (eg TLS) */
  29     NBDExportInfo info;
  30
  31     CoMutex send_mutex;
  32     CoQueue free_sema;
  33     Coroutine *connection_co;
  34     int in_flight;
  35
  36     NBDClientRequest requests[MAX_NBD_REQUESTS];
  37     NBDReply reply;
  38     BlockDriverState *bs;
  39     bool quit;
  40 } NBDClientSession;
  41
  42 NBDClientSession *nbd_get_client_session(BlockDriverState *bs);
  43
  44 int nbd_client_init(BlockDriverState *bs,
  45                     SocketAddress *saddr,
  46                     const char *export_name,
  47                     QCryptoTLSCreds *tlscreds,
  48                     const char *hostname,
  49                     const char *x_dirty_bitmap,
  50                     Error **errp);
  51 void nbd_client_close(BlockDriverState *bs);
  52
  53 int nbd_client_co_pdiscard(BlockDriverState *bs, int64_t offset, int bytes);
  54 int nbd_client_co_flush(BlockDriverState *bs);
  55 int nbd_client_co_pwritev(BlockDriverState *bs, uint64_t offset,
  56                           uint64_t bytes, QEMUIOVector *qiov, int flags);
  57 int nbd_client_co_pwrite_zeroes(BlockDriverState *bs, int64_t offset,
  58                                 int bytes, BdrvRequestFlags flags);
  59 int nbd_client_co_preadv(BlockDriverState *bs, uint64_t offset,
  60                          uint64_t bytes, QEMUIOVector *qiov, int flags);
  61
  62 void nbd_client_detach_aio_context(BlockDriverState *bs);
  63 void nbd_client_attach_aio_context(BlockDriverState *bs,
  64                                    AioContext *new_context);
  65
  66 int coroutine_fn nbd_client_co_block_status(BlockDriverState *bs,
  67                                             bool want_zero,
  68                                             int64_t offset, int64_t bytes,
  69                                             int64_t *pnum, int64_t *map,
  70                                             BlockDriverState **file);
  71
  72 #endif /* NBD_CLIENT_H */