OpenStack Compute (Nova)
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# 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,
instance=instance)
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)
def extend_volume(self, connection_info, instance, requested_size):
LOG.debug("calling os-brick to extend ScaleIO Volume",
instance=instance)
new_size = self.connector.extend_volume(connection_info['data'])
LOG.debug("Extend ScaleIO Volume %s; new_size=%s",
connection_info['data']['device_path'],
new_size, instance=instance)
return new_size