FDPARTITION
un->un_label.dkl_map[FDPARTITION(dev)].dkl_nblk;
part = FDPARTITION(dev);
part = FDPARTITION(dev);
dkm = &un->un_label.dkl_map[FDPARTITION(bp->b_edev)];
cpy.dki.dki_partition = FDPARTITION(dev);
part = FDPARTITION(bp->b_edev);