224 lines
9.1 KiB
Python
224 lines
9.1 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright 2012 Pedro Navarro Perez
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# Copyright 2013 Cloudbase Solutions Srl
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# All Rights Reserved.
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#
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# 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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"""
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Management class for Storage-related functions (attach, detach, etc).
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"""
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import time
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from oslo.config import cfg
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from nova import exception
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from nova.openstack.common import log as logging
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from nova.virt import driver
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from nova.virt.hyperv import hostutils
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from nova.virt.hyperv import vmutils
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from nova.virt.hyperv import volumeutils
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from nova.virt.hyperv import volumeutilsv2
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LOG = logging.getLogger(__name__)
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hyper_volumeops_opts = [
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cfg.IntOpt('volume_attach_retry_count',
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default=10,
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help='The number of times to retry to attach a volume'),
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cfg.IntOpt('volume_attach_retry_interval',
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default=5,
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help='Interval between volume attachment attempts, in seconds'),
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cfg.BoolOpt('force_volumeutils_v1',
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default=False,
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help='Force volumeutils v1'),
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]
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CONF = cfg.CONF
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CONF.register_opts(hyper_volumeops_opts, 'hyperv')
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CONF.import_opt('my_ip', 'nova.netconf')
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class VolumeOps(object):
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"""
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Management class for Volume-related tasks
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"""
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def __init__(self):
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self._hostutils = hostutils.HostUtils()
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self._vmutils = vmutils.VMUtils()
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self._volutils = self._get_volume_utils()
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self._initiator = None
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self._default_root_device = 'vda'
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def _get_volume_utils(self):
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if(not CONF.hyperv.force_volumeutils_v1 and
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self._hostutils.get_windows_version() >= 6.2):
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return volumeutilsv2.VolumeUtilsV2()
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else:
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return volumeutils.VolumeUtils()
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def ebs_root_in_block_devices(self, block_device_info):
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return self._volutils.volume_in_mapping(self._default_root_device,
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block_device_info)
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def attach_volumes(self, block_device_info, instance_name, ebs_root):
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mapping = driver.block_device_info_get_mapping(block_device_info)
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if ebs_root:
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self.attach_volume(mapping[0]['connection_info'],
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instance_name, True)
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mapping = mapping[1:]
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for vol in mapping:
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self.attach_volume(vol['connection_info'], instance_name)
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def login_storage_targets(self, block_device_info):
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mapping = driver.block_device_info_get_mapping(block_device_info)
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for vol in mapping:
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self._login_storage_target(vol['connection_info'])
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def _login_storage_target(self, connection_info):
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data = connection_info['data']
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target_lun = data['target_lun']
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target_iqn = data['target_iqn']
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target_portal = data['target_portal']
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# Check if we already logged in
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if self._volutils.get_device_number_for_target(target_iqn, target_lun):
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LOG.debug(_("Already logged in on storage target. No need to "
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"login. Portal: %(target_portal)s, "
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"IQN: %(target_iqn)s, LUN: %(target_lun)s") % locals())
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else:
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LOG.debug(_("Logging in on storage target. Portal: "
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"%(target_portal)s, IQN: %(target_iqn)s, "
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"LUN: %(target_lun)s") % locals())
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self._volutils.login_storage_target(target_lun, target_iqn,
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target_portal)
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# Wait for the target to be mounted
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self._get_mounted_disk_from_lun(target_iqn, target_lun, True)
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def attach_volume(self, connection_info, instance_name, ebs_root=False):
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"""
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Attach a volume to the SCSI controller or to the IDE controller if
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ebs_root is True
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"""
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LOG.debug(_("Attach_volume: %(connection_info)s to %(instance_name)s")
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% locals())
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try:
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self._login_storage_target(connection_info)
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data = connection_info['data']
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target_lun = data['target_lun']
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target_iqn = data['target_iqn']
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#Getting the mounted disk
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mounted_disk_path = self._get_mounted_disk_from_lun(target_iqn,
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target_lun)
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if ebs_root:
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#Find the IDE controller for the vm.
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ctrller_path = self._vmutils.get_vm_ide_controller(
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instance_name, 0)
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#Attaching to the first slot
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slot = 0
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else:
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#Find the SCSI controller for the vm
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ctrller_path = self._vmutils.get_vm_scsi_controller(
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instance_name)
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slot = self._get_free_controller_slot(ctrller_path)
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self._vmutils.attach_volume_to_controller(instance_name,
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ctrller_path,
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slot,
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mounted_disk_path)
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except Exception as exn:
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LOG.exception(_('Attach volume failed: %s'), exn)
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self._volutils.logout_storage_target(target_iqn)
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raise vmutils.HyperVException(_('Unable to attach volume '
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'to instance %s') % instance_name)
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def _get_free_controller_slot(self, scsi_controller_path):
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#Slots starts from 0, so the lenght of the disks gives us the free slot
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return self._vmutils.get_attached_disks_count(scsi_controller_path)
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def detach_volumes(self, block_device_info, instance_name):
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mapping = driver.block_device_info_get_mapping(block_device_info)
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for vol in mapping:
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self.detach_volume(vol['connection_info'], instance_name)
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def logout_storage_target(self, target_iqn):
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LOG.debug(_("Logging off storage target %(target_iqn)s") % locals())
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self._volutils.logout_storage_target(target_iqn)
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def detach_volume(self, connection_info, instance_name):
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"""Dettach a volume to the SCSI controller."""
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LOG.debug(_("Detach_volume: %(connection_info)s "
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"from %(instance_name)s") % locals())
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data = connection_info['data']
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target_lun = data['target_lun']
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target_iqn = data['target_iqn']
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#Getting the mounted disk
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mounted_disk_path = self._get_mounted_disk_from_lun(target_iqn,
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target_lun)
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LOG.debug(_("Detaching physical disk from instance: %s"),
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mounted_disk_path)
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self._vmutils.detach_vm_disk(instance_name, mounted_disk_path)
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self.logout_storage_target(target_iqn)
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def get_volume_connector(self, instance):
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if not self._initiator:
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self._initiator = self._volutils.get_iscsi_initiator()
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if not self._initiator:
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LOG.warn(_('Could not determine iscsi initiator name'),
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instance=instance)
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return {
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'ip': CONF.my_ip,
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'initiator': self._initiator,
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}
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def _get_mounted_disk_from_lun(self, target_iqn, target_lun,
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wait_for_device=False):
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device_number = self._volutils.get_device_number_for_target(target_iqn,
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target_lun)
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if device_number is None:
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raise exception.NotFound(_('Unable to find a mounted disk for '
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'target_iqn: %s') % target_iqn)
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LOG.debug(_('Device number: %(device_number)s, '
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'target lun: %(target_lun)s') % locals())
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#Finding Mounted disk drive
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for i in range(0, CONF.hyperv.volume_attach_retry_count):
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mounted_disk_path = self._vmutils.get_mounted_disk_by_drive_number(
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device_number)
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if mounted_disk_path or not wait_for_device:
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break
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time.sleep(CONF.hyperv.volume_attach_retry_interval)
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if not mounted_disk_path:
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raise exception.NotFound(_('Unable to find a mounted disk '
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'for target_iqn: %s') % target_iqn)
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return mounted_disk_path
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def disconnect_volume(self, physical_drive_path):
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#Get the session_id of the ISCSI connection
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session_id = self._volutils.get_session_id_from_mounted_disk(
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physical_drive_path)
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#Logging out the target
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self._volutils.execute_log_out(session_id)
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def get_target_from_disk_path(self, physical_drive_path):
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return self._volutils.get_target_from_disk_path(physical_drive_path)
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