10592 misc. metaslab and vdev related ZoL bug fixes
Portions contributed by: Jerry Jelinek <jerry.jelinek@joyent.com>
Reviewed by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed by: Giuseppe Di Natale <guss80@gmail.com>
Reviewed by: George Melikov <mail@gmelikov.ru>
Reviewed by: Paul Dagnelie <pcd@delphix.com>
Reviewed by: Matt Ahrens <mahrens@delphix.com>
Reviewed by: Pavel Zakharov <pavel.zakharov@delphix.com>
Reviewed by: Tony Hutter <hutter2@llnl.gov>
Reviewed by: Kody Kantor <kody.kantor@joyent.com>
Approved by: Dan McDonald <danmcd@joyent.com>

*** 678,688 ****
                  ASSERT(list_is_empty(&sci->sci_new_mapping_entries[i]));
          }
  
          VERIFY0(space_map_open(&prev_obsolete_sm, spa->spa_meta_objset,
              scip->scip_prev_obsolete_sm_object, 0, vd->vdev_asize, 0));
-         space_map_update(prev_obsolete_sm);
          counts = vdev_indirect_mapping_load_obsolete_counts(old_mapping);
          if (prev_obsolete_sm != NULL) {
                  vdev_indirect_mapping_load_obsolete_spacemap(old_mapping,
                      counts, prev_obsolete_sm);
          }
--- 678,687 ----
*** 831,850 ****
  
                  spa_feature_incr(spa, SPA_FEATURE_OBSOLETE_COUNTS, tx);
                  VERIFY0(space_map_open(&vd->vdev_obsolete_sm,
                      spa->spa_meta_objset, obsolete_sm_object,
                      0, vd->vdev_asize, 0));
-                 space_map_update(vd->vdev_obsolete_sm);
          }
  
          ASSERT(vd->vdev_obsolete_sm != NULL);
          ASSERT3U(vdev_obsolete_sm_object(vd), ==,
              space_map_object(vd->vdev_obsolete_sm));
  
          space_map_write(vd->vdev_obsolete_sm,
              vd->vdev_obsolete_segments, SM_ALLOC, SM_NO_VDEVID, tx);
-         space_map_update(vd->vdev_obsolete_sm);
          range_tree_vacate(vd->vdev_obsolete_segments, NULL, NULL);
  }
  
  int
  spa_condense_init(spa_t *spa)
--- 830,847 ----