vdev_dtl_required
required = vdev_dtl_required(vd);
if (vdev_dtl_required(vd))
if (vdev_dtl_required(vml[c])) {
!vdev_dtl_required(oldvd))
!vdev_dtl_required(oldvd))
!vdev_dtl_required(newvd))
ASSERT(vd->vdev_resilver_txg == 0 || !vdev_dtl_required(vd));
extern boolean_t vdev_dtl_required(vdev_t *vd);
if (!tvd->vdev_islog && vd->vdev_aux == NULL && vdev_dtl_required(vd)) {
vdev_dtl_required(vd))