150 lines
5.4 KiB
Python
150 lines
5.4 KiB
Python
#
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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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Helper methods for operations related to the management of volumes,
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and storage repositories
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"""
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import abc
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import re
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import sys
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if sys.platform == 'win32':
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from six.moves import winreg
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import wmi
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from nova import block_device
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from nova.virt import driver
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from oslo_log import log as logging
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from hyperv.i18n import _LI
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LOG = logging.getLogger(__name__)
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class BaseVolumeUtils(object):
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_FILE_DEVICE_DISK = 7
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def __init__(self, host='.'):
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if sys.platform == 'win32':
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self._conn_wmi = wmi.WMI(moniker='//%s/root/wmi' % host)
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self._conn_cimv2 = wmi.WMI(moniker='//%s/root/cimv2' % host)
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self._drive_number_regex = re.compile(r'DeviceID=\"[^,]*\\(\d+)\"')
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@abc.abstractmethod
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def login_storage_target(self, target_lun, target_iqn, target_portal):
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pass
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@abc.abstractmethod
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def logout_storage_target(self, target_iqn):
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pass
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@abc.abstractmethod
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def execute_log_out(self, session_id):
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pass
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def get_iscsi_initiator(self):
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"""Get iscsi initiator name for this machine."""
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computer_system = self._conn_cimv2.Win32_ComputerSystem()[0]
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hostname = computer_system.name
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keypath = ("SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\"
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"iSCSI\\Discovery")
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try:
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key = winreg.OpenKey(winreg.HKEY_LOCAL_MACHINE, keypath, 0,
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winreg.KEY_ALL_ACCESS)
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temp = winreg.QueryValueEx(key, 'DefaultInitiatorName')
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initiator_name = str(temp[0])
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winreg.CloseKey(key)
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except Exception:
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LOG.info(_LI("The ISCSI initiator name can't be found. "
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"Choosing the default one"))
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initiator_name = "iqn.1991-05.com.microsoft:" + hostname.lower()
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if computer_system.PartofDomain:
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initiator_name += '.' + computer_system.Domain.lower()
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return initiator_name
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def volume_in_mapping(self, mount_device, block_device_info):
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block_device_list = [block_device.strip_dev(vol['mount_device'])
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for vol in
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driver.block_device_info_get_mapping(
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block_device_info)]
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swap = driver.block_device_info_get_swap(block_device_info)
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if driver.swap_is_usable(swap):
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block_device_list.append(
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block_device.strip_dev(swap['device_name']))
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block_device_list += [block_device.strip_dev(
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ephemeral['device_name'])
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for ephemeral in
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driver.block_device_info_get_ephemerals(block_device_info)]
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LOG.debug("block_device_list %s", block_device_list)
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return block_device.strip_dev(mount_device) in block_device_list
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def _get_drive_number_from_disk_path(self, disk_path):
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drive_number = self._drive_number_regex.findall(disk_path)
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if drive_number:
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return int(drive_number[0])
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def get_session_id_from_mounted_disk(self, physical_drive_path):
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drive_number = self._get_drive_number_from_disk_path(
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physical_drive_path)
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if not drive_number:
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return None
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initiator_sessions = self._conn_wmi.MSiSCSIInitiator_SessionClass()
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for initiator_session in initiator_sessions:
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devices = initiator_session.Devices
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for device in devices:
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device_number = device.DeviceNumber
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if device_number == drive_number:
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return initiator_session.SessionId
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def _get_devices_for_target(self, target_iqn):
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initiator_sessions = self._conn_wmi.MSiSCSIInitiator_SessionClass(
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TargetName=target_iqn)
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if not initiator_sessions:
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return []
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return initiator_sessions[0].Devices
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def get_device_number_for_target(self, target_iqn, target_lun):
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devices = self._get_devices_for_target(target_iqn)
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for device in devices:
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if device.ScsiLun == target_lun:
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return device.DeviceNumber
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def get_target_lun_count(self, target_iqn):
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devices = self._get_devices_for_target(target_iqn)
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disk_devices = [device for device in devices
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if device.DeviceType == self._FILE_DEVICE_DISK]
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return len(disk_devices)
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def get_target_from_disk_path(self, disk_path):
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initiator_sessions = self._conn_wmi.MSiSCSIInitiator_SessionClass()
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drive_number = self._get_drive_number_from_disk_path(disk_path)
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if not drive_number:
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return None
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for initiator_session in initiator_sessions:
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devices = initiator_session.Devices
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for device in devices:
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if device.DeviceNumber == drive_number:
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return (device.TargetName, device.ScsiLun)
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