bre
status = bre(rq, /* build a request list */
status = bre(rq, Plexno(dev),
enum requeststatus bre(struct request *rq,
status = bre(rq, vol->plex[plexindex], &diskaddr, diskend); /* build up a request */
bre(rq, vol->plex[plexno], &diskaddr, diskend); /* try a request */
bre(rq, vol->plex[plexno], &diskstart, diskend));