3740 Poor ZFS send / receive performance due to snapshot hold / release processing
Submitted by: Steven Hartland <steven.hartland@multiplay.co.uk>

*** 185,196 ****
  int dsl_dataset_own_obj(struct dsl_pool *dp, uint64_t dsobj,
      void *tag, dsl_dataset_t **dsp);
  void dsl_dataset_disown(dsl_dataset_t *ds, void *tag);
  void dsl_dataset_name(dsl_dataset_t *ds, char *name);
  boolean_t dsl_dataset_tryown(dsl_dataset_t *ds, void *tag);
- void dsl_register_onexit_hold_cleanup(dsl_dataset_t *ds, const char *htag,
-     minor_t minor);
  uint64_t dsl_dataset_create_sync(dsl_dir_t *pds, const char *lastname,
      dsl_dataset_t *origin, uint64_t flags, cred_t *, dmu_tx_t *);
  uint64_t dsl_dataset_create_sync_dd(dsl_dir_t *dd, dsl_dataset_t *origin,
      uint64_t flags, dmu_tx_t *tx);
  int dsl_dataset_snapshot(nvlist_t *snaps, nvlist_t *props, nvlist_t *errors);
--- 185,194 ----