2882 implement libzfs_core
2883 changing "canmount" property to "on" should not always remount dataset
2900 "zfs snapshot" should be able to create multiple, arbitrary snapshots at once
Reviewed by: George Wilson <george.wilson@delphix.com>
Reviewed by: Chris Siden <christopher.siden@delphix.com>
Reviewed by: Garrett D'Amore <garrett@damore.org>
Reviewed by: Bill Pijewski <wdp@joyent.com>
Reviewed by: Dan Kruchinin <dan.kruchinin@gmail.com>

*** 277,286 ****
--- 277,289 ----
  {
          spa_t *spa = arg1;
          zfeature_info_t *feature = arg2;
  
          spa_feature_enable(spa, feature, tx);
+         spa_history_log_internal(spa, "zhack enable feature", tx,
+             "name=%s can_readonly=%u",
+             feature->fi_guid, feature->fi_can_readonly);
  }
  
  static void
  zhack_do_feature_enable(int argc, char **argv)
  {
*** 354,372 ****
--- 357,379 ----
  {
          spa_t *spa = arg1;
          zfeature_info_t *feature = arg2;
  
          spa_feature_incr(spa, feature, tx);
+         spa_history_log_internal(spa, "zhack feature incr", tx,
+             "name=%s", feature->fi_guid);
  }
  
  static void
  feature_decr_sync(void *arg1, void *arg2, dmu_tx_t *tx)
  {
          spa_t *spa = arg1;
          zfeature_info_t *feature = arg2;
  
          spa_feature_decr(spa, feature, tx);
+         spa_history_log_internal(spa, "zhack feature decr", tx,
+             "name=%s", feature->fi_guid);
  }
  
  static void
  zhack_do_feature_ref(int argc, char **argv)
  {