@classmethod
    def _ip_int_from_prefix(cls, prefixlen):
        return cls._ALL_ONES ^ (cls._ALL_ONES >> prefixlen)
Return usable bus number when create new SCSI controller.
dataset/ETHPy150Open anzev/hedwig/build/pip/pip/_vendor/ipaddress.py/_IPAddressBase._ip_int_from_prefix--crossover with--dataset/ETHPy150Open openstack/nova/nova/virt/vmwareapi/vm_util.py/_get_bus_number_for_scsi_controller