old_contents: # Copyright (c) 2015 EMC Corporation
  # All Rights Reserved.
  #
  #    Licensed under the Apache License, Version 2.0 (the "License"); you may
  #    not use this file except in compliance with the License. You may obtain
  #    a copy of the License at
  #
  #         http://www.apache.org/licenses/LICENSE-2.0
  #
  #    Unless required by applicable law or agreed to in writing, software
  #    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
  #    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
  #    License for the specific language governing permissions and limitations
  #    under the License.
  
  """Libvirt volume driver for ScaleIO."""
  
  from os_brick import initiator
  from os_brick.initiator import connector
  from oslo_log import log as logging
  
  import nova.conf
  from nova import utils
  from nova.virt.libvirt.volume import volume as libvirt_volume
  
  LOG = logging.getLogger(__name__)
  
  CONF = nova.conf.CONF
  
  
  class LibvirtScaleIOVolumeDriver(libvirt_volume.LibvirtBaseVolumeDriver):
      """Class ScaleIO Libvirt volume Driver
  
      Implements Libvirt part of volume driver for ScaleIO cinder driver.
      Uses the ScaleIO connector from the os-brick projects
      """
      def __init__(self, host):
          super(LibvirtScaleIOVolumeDriver, self).__init__(host,
                                                           is_block_dev=False)
          self.connector = connector.InitiatorConnector.factory(
              initiator.SCALEIO, utils.get_root_helper(),
              device_scan_attempts=CONF.libvirt.num_volume_scan_tries)
  
      def get_config(self, connection_info, disk_info):
          conf = super(LibvirtScaleIOVolumeDriver, self).get_config(
              connection_info, disk_info)
  
          conf.source_type = 'block'
          conf.source_path = connection_info['data']['device_path']
          return conf
  
      def connect_volume(self, connection_info, instance):
          device_info = self.connector.connect_volume(connection_info['data'])
          LOG.debug("Attached ScaleIO volume %s.", device_info)
          connection_info['data']['device_path'] = device_info['path']
  
      def disconnect_volume(self, connection_info, instance):
          self.connector.disconnect_volume(connection_info['data'], None)
          LOG.debug("Disconnected volume", instance=instance)
  
          super(LibvirtScaleIOVolumeDriver, self).disconnect_volume(
              connection_info, instance)
  
new_contents: # Copyright (c) 2015 EMC Corporation
  # All Rights Reserved.
  #
  #    Licensed under the Apache License, Version 2.0 (the "License"); you may
  #    not use this file except in compliance with the License. You may obtain
  #    a copy of the License at
  #
  #         http://www.apache.org/licenses/LICENSE-2.0
  #
  #    Unless required by applicable law or agreed to in writing, software
  #    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
  #    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
  #    License for the specific language governing permissions and limitations
  #    under the License.
  
  """Libvirt volume driver for ScaleIO."""
  
  from os_brick import initiator
  from os_brick.initiator import connector
  from oslo_log import log as logging
  
  import nova.conf
  from nova import utils
  from nova.virt.libvirt.volume import volume as libvirt_volume
  
  LOG = logging.getLogger(__name__)
  
  CONF = nova.conf.CONF
  
  
  class LibvirtScaleIOVolumeDriver(libvirt_volume.LibvirtBaseVolumeDriver):
      """Class ScaleIO Libvirt volume Driver
  
      Implements Libvirt part of volume driver for ScaleIO cinder driver.
      Uses the ScaleIO connector from the os-brick projects
      """
      def __init__(self, host):
          super(LibvirtScaleIOVolumeDriver, self).__init__(host,
                                                           is_block_dev=False)
          self.connector = connector.InitiatorConnector.factory(
              initiator.SCALEIO, utils.get_root_helper(),
              device_scan_attempts=CONF.libvirt.num_volume_scan_tries)
  
      def get_config(self, connection_info, disk_info):
          conf = super(LibvirtScaleIOVolumeDriver, self).get_config(
              connection_info, disk_info)
  
          conf.source_type = 'block'
          conf.source_path = connection_info['data']['device_path']
          conf.driver_io = "native"
          return conf
  
      def connect_volume(self, connection_info, instance):
          device_info = self.connector.connect_volume(connection_info['data'])
          LOG.debug("Attached ScaleIO volume %s.", device_info)
          connection_info['data']['device_path'] = device_info['path']
  
      def disconnect_volume(self, connection_info, instance):
          self.connector.disconnect_volume(connection_info['data'], None)
          LOG.debug("Disconnected volume", instance=instance)
  
          super(LibvirtScaleIOVolumeDriver, self).disconnect_volume(
              connection_info, instance)
  
subject: Enable native mode for ScaleIO volumes