4101 metaslab_debug should allow for fine-grained control
4102 space_maps should store more information about themselves
4103 space map object blocksize should be increased
4104 ::spa_space no longer works
4105 removing a mirrored log device results in a leaked object
4106 asynchronously load metaslab
Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Reviewed by: Adam Leventhal <ahl@delphix.com>
Reviewed by: Sebastien Roy <seb@delphix.com>

@@ -142,11 +142,10 @@
         vnode_t         *vdev_devid_vp; /* vnode for devid              */
         vdev_t          *vdev_top;      /* top-level vdev               */
         vdev_t          *vdev_parent;   /* parent vdev                  */
         vdev_t          **vdev_child;   /* array of children            */
         uint64_t        vdev_children;  /* number of children           */
-        space_map_t     vdev_dtl[DTL_TYPES]; /* in-core dirty time logs */
         vdev_stat_t     vdev_stat;      /* virtual device statistics    */
         boolean_t       vdev_expanding; /* expand the vdev?             */
         boolean_t       vdev_reopening; /* reopen in progress?          */
         int             vdev_open_error; /* error on last open          */
         kthread_t       *vdev_open_thread; /* thread opening children   */

@@ -163,23 +162,25 @@
         txg_list_t      vdev_ms_list;   /* per-txg dirty metaslab lists */
         txg_list_t      vdev_dtl_list;  /* per-txg dirty DTL lists      */
         txg_node_t      vdev_txg_node;  /* per-txg dirty vdev linkage   */
         boolean_t       vdev_remove_wanted; /* async remove wanted?     */
         boolean_t       vdev_probe_wanted; /* async probe wanted?       */
-        uint64_t        vdev_removing;  /* device is being removed?     */
         list_node_t     vdev_config_dirty_node; /* config dirty list    */
         list_node_t     vdev_state_dirty_node; /* state dirty list      */
         uint64_t        vdev_deflate_ratio; /* deflation ratio (x512)   */
         uint64_t        vdev_islog;     /* is an intent log device      */
-        uint64_t        vdev_ishole;    /* is a hole in the namespace   */
+        uint64_t        vdev_removing;  /* device is being removed?     */
+        boolean_t       vdev_ishole;    /* is a hole in the namespace   */
 
         /*
          * Leaf vdev state.
          */
-        uint64_t        vdev_psize;     /* physical device capacity     */
-        space_map_obj_t vdev_dtl_smo;   /* dirty time log space map obj */
+        range_tree_t    *vdev_dtl[DTL_TYPES]; /* dirty time logs        */
+        space_map_t     *vdev_dtl_sm;   /* dirty time log space map     */
         txg_node_t      vdev_dtl_node;  /* per-txg dirty DTL linkage    */
+        uint64_t        vdev_dtl_object; /* DTL object                  */
+        uint64_t        vdev_psize;     /* physical device capacity     */
         uint64_t        vdev_wholedisk; /* true if this is a whole disk */
         uint64_t        vdev_offline;   /* persistent offline state     */
         uint64_t        vdev_faulted;   /* persistent faulted state     */
         uint64_t        vdev_degraded;  /* persistent degraded state    */
         uint64_t        vdev_removed;   /* persistent removed state     */

@@ -189,22 +190,21 @@
         char            *vdev_devid;    /* vdev devid (if any)          */
         char            *vdev_physpath; /* vdev device path (if any)    */
         char            *vdev_fru;      /* physical FRU location        */
         uint64_t        vdev_not_present; /* not present during import  */
         uint64_t        vdev_unspare;   /* unspare when resilvering done */
-        hrtime_t        vdev_last_try;  /* last reopen time             */
         boolean_t       vdev_nowritecache; /* true if flushwritecache failed */
         boolean_t       vdev_checkremove; /* temporary online test      */
         boolean_t       vdev_forcefault; /* force online fault          */
         boolean_t       vdev_splitting; /* split or repair in progress  */
         boolean_t       vdev_delayed_close; /* delayed device close?    */
-        uint8_t         vdev_tmpoffline; /* device taken offline temporarily? */
-        uint8_t         vdev_detached;  /* device detached?             */
-        uint8_t         vdev_cant_read; /* vdev is failing all reads    */
-        uint8_t         vdev_cant_write; /* vdev is failing all writes  */
-        uint64_t        vdev_isspare;   /* was a hot spare              */
-        uint64_t        vdev_isl2cache; /* was a l2cache device         */
+        boolean_t       vdev_tmpoffline; /* device taken offline temporarily? */
+        boolean_t       vdev_detached;  /* device detached?             */
+        boolean_t       vdev_cant_read; /* vdev is failing all reads    */
+        boolean_t       vdev_cant_write; /* vdev is failing all writes  */
+        boolean_t       vdev_isspare;   /* was a hot spare              */
+        boolean_t       vdev_isl2cache; /* was a l2cache device         */
         vdev_queue_t    vdev_queue;     /* I/O deadline schedule queue  */
         vdev_cache_t    vdev_cache;     /* physical block cache         */
         spa_aux_vdev_t  *vdev_aux;      /* for l2cache vdevs            */
         zio_t           *vdev_probe_zio; /* root of current probe       */
         vdev_aux_t      vdev_label_aux; /* on-disk aux state            */

@@ -301,13 +301,15 @@
  * vdev sync load and sync
  */
 extern void vdev_load_log_state(vdev_t *nvd, vdev_t *ovd);
 extern boolean_t vdev_log_state_valid(vdev_t *vd);
 extern void vdev_load(vdev_t *vd);
+extern int vdev_dtl_load(vdev_t *vd);
 extern void vdev_sync(vdev_t *vd, uint64_t txg);
 extern void vdev_sync_done(vdev_t *vd, uint64_t txg);
 extern void vdev_dirty(vdev_t *vd, int flags, void *arg, uint64_t txg);
+extern void vdev_dirty_leaves(vdev_t *vd, int flags, uint64_t txg);
 
 /*
  * Available vdev types.
  */
 extern vdev_ops_t vdev_root_ops;