2619 asynchronous destruction of ZFS file systems
2747 SPA versioning with zfs feature flags
Reviewed by: Matt Ahrens <mahrens@delphix.com>
Reviewed by: George Wilson <gwilson@delphix.com>
Reviewed by: Richard Lowe <richlowe@richlowe.net>
Reviewed by: Dan Kruchinin <dan.kruchinin@gmail.com>
Approved by: Dan McDonald <danmcd@nexenta.com>

*** 18,28 ****
   *
   * CDDL HEADER END
   */
  /*
   * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
!  * Copyright (c) 2011 by Delphix. All rights reserved.
   * Copyright (c) 2012, Joyent, Inc. All rights reserved.
   */
  
  #ifndef _SYS_DSL_DATASET_H
  #define _SYS_DSL_DATASET_H
--- 18,28 ----
   *
   * CDDL HEADER END
   */
  /*
   * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
!  * Copyright (c) 2012 by Delphix. All rights reserved.
   * Copyright (c) 2012, Joyent, Inc. All rights reserved.
   */
  
  #ifndef _SYS_DSL_DATASET_H
  #define _SYS_DSL_DATASET_H
*** 84,94 ****
          uint64_t ds_snapnames_zapobj;   /* DMU_OT_DSL_DS_SNAP_MAP 0 for snaps */
          uint64_t ds_num_children;       /* clone/snap children; ==0 for head */
          uint64_t ds_creation_time;      /* seconds since 1970 */
          uint64_t ds_creation_txg;
          uint64_t ds_deadlist_obj;       /* DMU_OT_DEADLIST */
!         uint64_t ds_used_bytes;
          uint64_t ds_compressed_bytes;
          uint64_t ds_uncompressed_bytes;
          uint64_t ds_unique_bytes;       /* only relevant to snapshots */
          /*
           * The ds_fsid_guid is a 56-bit ID that can change to avoid
--- 84,99 ----
          uint64_t ds_snapnames_zapobj;   /* DMU_OT_DSL_DS_SNAP_MAP 0 for snaps */
          uint64_t ds_num_children;       /* clone/snap children; ==0 for head */
          uint64_t ds_creation_time;      /* seconds since 1970 */
          uint64_t ds_creation_txg;
          uint64_t ds_deadlist_obj;       /* DMU_OT_DEADLIST */
!         /*
!          * ds_referenced_bytes, ds_compressed_bytes, and ds_uncompressed_bytes
!          * include all blocks referenced by this dataset, including those
!          * shared with any other datasets.
!          */
!         uint64_t ds_referenced_bytes;
          uint64_t ds_compressed_bytes;
          uint64_t ds_uncompressed_bytes;
          uint64_t ds_unique_bytes;       /* only relevant to snapshots */
          /*
           * The ds_fsid_guid is a 56-bit ID that can change to avoid