OpenStack Compute (Nova)
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# 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 iSCSI"""
from os_brick import exception as os_brick_exception
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 LibvirtISCSIVolumeDriver(libvirt_volume.LibvirtBaseVolumeDriver):
"""Driver to attach Network volumes to libvirt."""
def __init__(self, host):
super(LibvirtISCSIVolumeDriver, self).__init__(host,
is_block_dev=True)
# Call the factory here so we can support
# more than x86 architectures.
self.connector = connector.InitiatorConnector.factory(
initiator.ISCSI, utils.get_root_helper(),
use_multipath=CONF.libvirt.volume_use_multipath,
device_scan_attempts=CONF.libvirt.num_volume_scan_tries,
transport=self._get_transport())
def _get_transport(self):
if CONF.libvirt.iscsi_iface:
transport = CONF.libvirt.iscsi_iface
else:
transport = 'default'
return transport
def get_config(self, connection_info, disk_info):
"""Returns xml for libvirt."""
conf = super(LibvirtISCSIVolumeDriver,
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):
"""Attach the volume to instance_name."""
LOG.debug("Calling os-brick to attach iSCSI Volume", instance=instance)
device_info = self.connector.connect_volume(connection_info['data'])
LOG.debug("Attached iSCSI volume %s", device_info, instance=instance)
connection_info['data']['device_path'] = device_info['path']
def disconnect_volume(self, connection_info, instance):
"""Detach the volume from instance_name."""
LOG.debug("calling os-brick to detach iSCSI Volume", instance=instance)
try:
self.connector.disconnect_volume(connection_info['data'], None)
except os_brick_exception.VolumeDeviceNotFound as exc:
LOG.warning('Ignoring VolumeDeviceNotFound: %s', exc)
return
LOG.debug("Disconnected iSCSI Volume", instance=instance)
super(LibvirtISCSIVolumeDriver,
self).disconnect_volume(connection_info, instance)
def extend_volume(self, connection_info, instance, requested_size):
"""Extend the volume."""
LOG.debug("calling os-brick to extend iSCSI Volume", instance=instance)
new_size = self.connector.extend_volume(connection_info['data'])
LOG.debug("Extend iSCSI Volume: new_size=%s",
new_size, instance=instance)
return new_size