FD_OPEN           558 dev/isa/fd.c   	if ((fd->sc_flags & FD_OPEN) != 0 &&
FD_OPEN           564 dev/isa/fd.c   	fd->sc_flags |= FD_OPEN;
FD_OPEN           578 dev/isa/fd.c   	fd->sc_flags &= ~FD_OPEN;