def disk_qos(self, info, extra_specs):
        tune_items = ['disk_read_bytes_sec', 'disk_read_iops_sec',
            'disk_write_bytes_sec', 'disk_write_iops_sec',
            'disk_total_bytes_sec', 'disk_total_iops_sec']
        for key, value in six.iteritems(extra_specs):
            scope = key.split(':')
            if len(scope) > 1 and scope[0] == 'quota':
                if scope[1] in tune_items:
                    setattr(info, scope[1], value)