old_contents: #    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.
  
  from nova.virt.libvirt.volume import volume as libvirt_volume
  
  
  class LibvirtGPFSVolumeDriver(libvirt_volume.LibvirtBaseVolumeDriver):
      """Class for volumes backed by gpfs volume."""
      def __init__(self, connection):
          super(LibvirtGPFSVolumeDriver,
                self).__init__(connection, is_block_dev=False)
  
      def get_config(self, connection_info, disk_info):
          """Returns xml for libvirt."""
          conf = super(LibvirtGPFSVolumeDriver,
                       self).get_config(connection_info, disk_info)
          conf.source_type = "file"
          conf.source_path = connection_info['data']['device_path']
          return conf
  
new_contents: #    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.
  
  from nova.virt.libvirt.volume import fs
  
  
  class LibvirtGPFSVolumeDriver(fs.LibvirtBaseFileSystemVolumeDriver):
      """Class for volumes backed by gpfs volume."""
  
      def _get_mount_point_base(self):
          return ''
  
      def get_config(self, connection_info, disk_info):
          """Returns xml for libvirt."""
          conf = super(LibvirtGPFSVolumeDriver,
                       self).get_config(connection_info, disk_info)
          conf.source_type = "file"
          conf.source_path = connection_info['data']['device_path']
          return conf
  
subject: convert GPFS volume driver to LibvirtBaseFileSystemVolumeDriver