raopen
SADEV("ra",rastrategy, raopen, raclose, noioctl),
SADEV("mt",rastrategy, raopen, nullsys, noioctl),
int raopen(struct open_file *, int, int, int, int),
dev_type_open(raopen);
.d_open = raopen,
.d_open = raopen,
dev_type_open(raopen);
.d_open = raopen,
.d_open = raopen,