7938 disable LBA weighting on files and SSDs
Reviewed by: Yuri Pankov <yuripv@gmx.com>
Reviewed by: Matthew Ahrens <mahrens@delphix.com>

*** 1107,1116 ****
--- 1107,1117 ----
          vdev_t *vd = arg;
  
          vd->vdev_open_thread = curthread;
          vd->vdev_open_error = vdev_open(vd);
          vd->vdev_open_thread = NULL;
+         vd->vdev_parent->vdev_nonrot &= vd->vdev_nonrot;
  }
  
  boolean_t
  vdev_uses_zvols(vdev_t *vd)
  {
*** 1127,1145 ****
  vdev_open_children(vdev_t *vd)
  {
          taskq_t *tq;
          int children = vd->vdev_children;
  
          /*
           * in order to handle pools on top of zvols, do the opens
           * in a single thread so that the same thread holds the
           * spa_namespace_lock
           */
          if (vdev_uses_zvols(vd)) {
!                 for (int c = 0; c < children; c++)
                          vd->vdev_child[c]->vdev_open_error =
                              vdev_open(vd->vdev_child[c]);
                  return;
          }
          tq = taskq_create("vdev_open", children, minclsyspri,
              children, children, TASKQ_PREPOPULATE);
  
--- 1128,1150 ----
  vdev_open_children(vdev_t *vd)
  {
          taskq_t *tq;
          int children = vd->vdev_children;
  
+         vd->vdev_nonrot = B_TRUE;
+ 
          /*
           * in order to handle pools on top of zvols, do the opens
           * in a single thread so that the same thread holds the
           * spa_namespace_lock
           */
          if (vdev_uses_zvols(vd)) {
!                 for (int c = 0; c < children; c++) {
                          vd->vdev_child[c]->vdev_open_error =
                              vdev_open(vd->vdev_child[c]);
+                         vd->vdev_nonrot &= vd->vdev_child[c]->vdev_nonrot;
+                 }
                  return;
          }
          tq = taskq_create("vdev_open", children, minclsyspri,
              children, children, TASKQ_PREPOPULATE);
  
*** 1146,1155 ****
--- 1151,1163 ----
          for (int c = 0; c < children; c++)
                  VERIFY(taskq_dispatch(tq, vdev_open_child, vd->vdev_child[c],
                      TQ_SLEEP) != NULL);
  
          taskq_destroy(tq);
+ 
+         for (int c = 0; c < children; c++)
+                 vd->vdev_nonrot &= vd->vdev_child[c]->vdev_nonrot;
  }
  
  /*
   * Prepare a virtual device for access.
   */