i_ordev
ip->i_ordev = dev32; /* can't use old format */
ip->i_ordev = cmpdev(d);
uint_t top16 = ip->i_ordev & 0xffff0000u;
dv = expdev(ip->i_ordev);
dv = expldev(ip->i_ordev);
ip->i_ordev = dev32; /* can't use old fmt. */
ip->i_ordev = cmpdev(d);
ip->i_ordev = 0;