98 lines
3.9 KiB
Python
98 lines
3.9 KiB
Python
# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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"""Libvirt volume driver for iSCSI"""
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from os_brick.initiator import connector
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from oslo_config import cfg
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from oslo_log import log as logging
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from nova import utils
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from nova.virt.libvirt.volume import volume as libvirt_volume
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LOG = logging.getLogger(__name__)
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volume_opts = [
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cfg.IntOpt('num_iscsi_scan_tries',
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default=5,
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help='Number of times to rescan iSCSI target to find volume'),
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cfg.BoolOpt('iscsi_use_multipath',
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default=False,
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help='Use multipath connection of the iSCSI volume'),
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cfg.StrOpt('iscsi_iface',
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deprecated_name='iscsi_transport',
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help='The iSCSI transport iface to use to connect to target in '
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'case offload support is desired. Default format is of '
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'the form <transport_name>.<hwaddress> where '
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'<transport_name> is one of (be2iscsi, bnx2i, cxgb3i, '
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'cxgb4i, qla4xxx, ocs) and <hwaddress> is the MAC address '
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'of the interface and can be generated via the '
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'iscsiadm -m iface command. Do not confuse the '
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'iscsi_iface parameter to be provided here with the '
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'actual transport name.'),
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# iser is also supported, but use LibvirtISERVolumeDriver
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# instead
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]
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CONF = cfg.CONF
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CONF.register_opts(volume_opts, 'libvirt')
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class LibvirtISCSIVolumeDriver(libvirt_volume.LibvirtBaseVolumeDriver):
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"""Driver to attach Network volumes to libvirt."""
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def __init__(self, connection):
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super(LibvirtISCSIVolumeDriver, self).__init__(connection,
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is_block_dev=True)
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# Call the factory here so we can support
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# more than x86 architectures.
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self.connector = connector.InitiatorConnector.factory(
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'ISCSI', utils.get_root_helper(),
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use_multipath=CONF.libvirt.iscsi_use_multipath,
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device_scan_attempts=CONF.libvirt.num_iscsi_scan_tries,
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transport=self._get_transport())
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def _get_transport(self):
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if CONF.libvirt.iscsi_iface:
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transport = CONF.libvirt.iscsi_iface
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else:
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transport = 'default'
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return transport
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def get_config(self, connection_info, disk_info):
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"""Returns xml for libvirt."""
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conf = super(LibvirtISCSIVolumeDriver,
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self).get_config(connection_info, disk_info)
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conf.source_type = "block"
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conf.source_path = connection_info['data']['device_path']
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return conf
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def connect_volume(self, connection_info, disk_info):
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"""Attach the volume to instance_name."""
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LOG.debug("Calling os-brick to attach iSCSI Volume")
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device_info = self.connector.connect_volume(connection_info['data'])
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LOG.debug("Attached iSCSI volume %s", device_info)
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connection_info['data']['device_path'] = device_info['path']
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def disconnect_volume(self, connection_info, disk_dev):
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"""Detach the volume from instance_name."""
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LOG.debug("calling os-brick to detach iSCSI Volume")
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self.connector.disconnect_volume(connection_info['data'], None)
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LOG.debug("Disconnected iSCSI Volume %s", disk_dev)
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super(LibvirtISCSIVolumeDriver,
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self).disconnect_volume(connection_info, disk_dev)
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