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

*** 19,28 ****
--- 19,29 ----
   * CDDL HEADER END
   */
  /*
   * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
   * Copyright (c) 2013 by Delphix. All rights reserved.
+  * Copyright (c) 2013 Steven Hartland. All rights reserved.
   */
  
  #include <sys/zfs_context.h>
  #include <sys/dsl_userhold.h>
  #include <sys/dsl_dataset.h>
*** 125,134 ****
--- 126,139 ----
          }
  
          pair = nvlist_next_nvpair(dsda->dsda_errlist, NULL);
          if (pair != NULL)
                  return (fnvpair_value_int32(pair));
+ 
+         if (nvlist_empty(dsda->dsda_successful_snaps))
+                 return (SET_ERROR(ENOENT));
+ 
          return (0);
  }
  
  struct process_old_arg {
          dsl_dataset_t *ds;