VDCPART
nblocks = vdc->slice[VDCPART(dev)].nblocks;
slice = VDCPART(*dev);
slice = VDCPART(dev);
rv = vdc_do_op(vdc, VD_OP_BWRITE, addr, nbytes, VDCPART(dev),
slice = VDCPART(buf->b_edev);
VDCPART(dk_arg->dev), 0, VIO_both_dir, B_TRUE);
cinfo.dki_partition = VDCPART(dev);
VDCPART(dev), 0, VIO_both_dir, B_TRUE);