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
   8 /* #define DEBUG_NBD */
   9
  10 #if defined(DEBUG_NBD)
  11 #define logout(fmt, ...) \
  12     fprintf(stderr, "nbd\t%-24s" fmt, __func__, ##__VA_ARGS__)
  13 #else
  14 #define logout(fmt, ...) ((void)0)
  15 #endif
  16
  17 #define MAX_NBD_REQUESTS    16
  18
  19 typedef struct NbdClientSession {
  20     int sock;
  21     uint32_t nbdflags;
  22     off_t size;
  23     size_t blocksize;
  24
  25     CoMutex send_mutex;
  26     CoMutex free_sema;
  27     Coroutine *send_coroutine;
  28     int in_flight;
  29
  30     Coroutine *recv_coroutine[MAX_NBD_REQUESTS];
  31     struct nbd_reply reply;
  32
  33     bool is_unix;
  34 } NbdClientSession;
  35
  36 NbdClientSession *nbd_get_client_session(BlockDriverState *bs);
  37
  38 int nbd_client_init(BlockDriverState *bs, int sock, const char *export_name,
  39                     Error **errp);
  40 void nbd_client_close(BlockDriverState *bs);
  41
  42 int nbd_client_co_discard(BlockDriverState *bs, int64_t sector_num,
  43                           int nb_sectors);
  44 int nbd_client_co_flush(BlockDriverState *bs);
  45 int nbd_client_co_writev(BlockDriverState *bs, int64_t sector_num,
  46                          int nb_sectors, QEMUIOVector *qiov);
  47 int nbd_client_co_readv(BlockDriverState *bs, int64_t sector_num,
  48                         int nb_sectors, QEMUIOVector *qiov);
  49
  50 void nbd_client_detach_aio_context(BlockDriverState *bs);
  51 void nbd_client_attach_aio_context(BlockDriverState *bs,
  52                                    AioContext *new_context);
  53
  54 #endif /* NBD_CLIENT_H */