aceopen
dev_type_open(aceopen);
.d_open = aceopen,
.d_open = aceopen,
if (omask == 0 && aceopen(dev, 0, S_IFBLK, NULL) != 0)
extern int aceopen (struct open_file*, ...);
{ "ace", acestrategy, aceopen, aceclose, aceioctl },
er = aceopen(f,ctlr,unit,part);