ST_PRESERVE_RESERVE
if ((un->un_rsvd_status & ST_RESERVE | ST_PRESERVE_RESERVE) &&
(ST_RESERVE | ST_PRESERVE_RESERVE)) == ST_RESERVE) {
(ST_RESERVE | ST_PRESERVE_RESERVE)) ==
(ST_RESERVE | ST_PRESERVE_RESERVE |
un->un_rsvd_status |= ST_PRESERVE_RESERVE;
un->un_rsvd_status &= ~ST_PRESERVE_RESERVE;
(ST_RESERVE | ST_LOST_RESERVE | ST_PRESERVE_RESERVE)