DTL_PARTIAL
if (!vdev_dtl_contains(vd, DTL_PARTIAL, phys_birth, 1))
range_tree_vacate(vd->vdev_dtl[DTL_PARTIAL], NULL, NULL);
range_tree_add, vd->vdev_dtl[DTL_PARTIAL]);
if (t == DTL_PARTIAL)
vdev_dtl_dirty(pvd, DTL_PARTIAL, txg, 1);
!vdev_dtl_contains(mc->mc_vd, DTL_PARTIAL,
if (!vdev_dtl_empty(cvd, DTL_PARTIAL))
!vdev_dtl_contains(vd, DTL_PARTIAL, zio->io_txg, 1)) {