DTL_OUTAGE
vdev_dtl_empty(newvd, DTL_OUTAGE) &&
vdev_dtl_empty(newvd, DTL_OUTAGE) &&
vdev_dtl_empty(last, DTL_OUTAGE) &&
range_tree_vacate(vd->vdev_dtl[DTL_OUTAGE], NULL, NULL);
range_tree_add(vd->vdev_dtl[DTL_OUTAGE], 0, -1ULL);
range_tree_add, vd->vdev_dtl[DTL_OUTAGE]);
range_tree_is_empty(vd->vdev_dtl[DTL_OUTAGE]))
int s = (t == DTL_MISSING) ? DTL_OUTAGE: t;
required = !vdev_dtl_empty(tvd, DTL_OUTAGE);
!vdev_dtl_empty(vd, DTL_OUTAGE))