DASD_FLAG_IS_RESERVED
if (test_bit(DASD_FLAG_IS_RESERVED, &device->flags))
test_bit(DASD_FLAG_IS_RESERVED, &device->flags)) {
clear_bit(DASD_FLAG_IS_RESERVED, &device->flags);
clear_bit(DASD_FLAG_IS_RESERVED, &device->flags);
set_bit(DASD_FLAG_IS_RESERVED, &device->flags);
set_bit(DASD_FLAG_IS_RESERVED, &device->flags);