17bef5e591
Adds storage-assisted migration support for Unity driver. Change-Id: Ibaf2e6a09f93b167b6b1477d5653922d807fccce Implements: blueprint unity-storage-assisted-volume-migration-support
335 lines
11 KiB
Python
335 lines
11 KiB
Python
# Copyright (c) 2016 Dell Inc. or its subsidiaries.
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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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from __future__ import division
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import contextlib
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from distutils import version
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import functools
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from oslo_log import log as logging
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from oslo_utils import fnmatch
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from oslo_utils import units
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import six
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from cinder import coordination
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from cinder import exception
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from cinder.i18n import _
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from cinder.objects import fields
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from cinder.volume import utils as vol_utils
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from cinder.volume import volume_types
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from cinder.zonemanager import utils as zm_utils
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LOG = logging.getLogger(__name__)
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BACKEND_QOS_CONSUMERS = frozenset(['back-end', 'both'])
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QOS_MAX_IOPS = 'maxIOPS'
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QOS_MAX_BWS = 'maxBWS'
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def dump_provider_location(location_dict):
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sorted_keys = sorted(location_dict.keys())
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return '|'.join('%(k)s^%(v)s' % {'k': k, 'v': location_dict[k]}
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for k in sorted_keys)
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def build_provider_location(system, lun_type, lun_id, version):
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"""Builds provider_location for volume or snapshot.
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:param system: Unity serial number
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:param lun_id: LUN ID in Unity
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:param lun_type: 'lun'
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:param version: driver version
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"""
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location_dict = {'system': system,
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'type': lun_type,
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'id': six.text_type(lun_id),
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'version': version}
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return dump_provider_location(location_dict)
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def extract_provider_location(provider_location, key):
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"""Extracts value of the specified field from provider_location string.
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:param provider_location: provider_location string
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:param key: field name of the value that to be extracted
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:return: value of the specified field if it exists, otherwise,
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None is returned
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"""
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if provider_location:
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for kvp in provider_location.split('|'):
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fields = kvp.split('^')
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if len(fields) == 2 and fields[0] == key:
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return fields[1]
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else:
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LOG.warning('"%(key)s" is not found in provider '
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'location "%(location)s."',
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{'key': key, 'location': provider_location})
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else:
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LOG.warning('Empty provider location received.')
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def byte_to_gib(byte):
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return byte / units.Gi
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def byte_to_mib(byte):
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return byte / units.Mi
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def gib_to_mib(gib):
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return gib * units.Ki
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def validate_pool_names(conf_pools, array_pools):
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if not conf_pools:
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LOG.debug('No storage pools are specified. This host will manage '
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'all the pools on the Unity system.')
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return array_pools
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conf_pools = set(map(lambda i: i.strip(), conf_pools))
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array_pools = set(map(lambda i: i.strip(), array_pools))
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existed = conf_pools & array_pools
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if not existed:
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msg = (_('No storage pools to be managed exist. Please check '
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'your configuration. The available storage pools on the '
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'system are %s.') % array_pools)
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raise exception.VolumeBackendAPIException(data=msg)
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return existed
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def extract_iscsi_uids(connector):
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if 'initiator' not in connector:
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msg = _("Host %s doesn't have iSCSI initiator.") % connector['host']
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raise exception.VolumeBackendAPIException(data=msg)
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return [connector['initiator']]
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def extract_fc_uids(connector):
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if 'wwnns' not in connector or 'wwpns' not in connector:
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msg = _("Host %s doesn't have FC initiators.") % connector['host']
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LOG.error(msg)
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raise exception.VolumeBackendAPIException(data=msg)
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wwnns = connector['wwnns']
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wwpns = connector['wwpns']
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wwns = [(node + port).upper() for node, port in zip(wwnns, wwpns)]
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def _to_wwn(wwn):
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# Format the wwn to include the colon
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# For example, convert 1122200000051E55E100 to
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# 11:22:20:00:00:05:1E:55:A1:00
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return ':'.join(wwn[i:i + 2] for i in range(0, len(wwn), 2))
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return list(map(_to_wwn, wwns))
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def convert_ip_to_portal(ip):
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is_ipv6_without_brackets = ':' in ip and ip[-1] != ']'
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if is_ipv6_without_brackets:
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return '[%s]:3260' % ip
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return '%s:3260' % ip
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def convert_to_itor_tgt_map(zone_mapping):
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"""Function to process data from lookup service.
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:param zone_mapping: mapping is the data from the zone lookup service
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with below format
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{
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<San name>: {
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'initiator_port_wwn_list':
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('200000051e55a100', '200000051e55a121'..)
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'target_port_wwn_list':
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('100000051e55a100', '100000051e55a121'..)
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}
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}
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"""
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target_wwns = []
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itor_tgt_map = {}
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for san_name in zone_mapping:
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one_map = zone_mapping[san_name]
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for target in one_map['target_port_wwn_list']:
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if target not in target_wwns:
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target_wwns.append(target)
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for initiator in one_map['initiator_port_wwn_list']:
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itor_tgt_map[initiator] = one_map['target_port_wwn_list']
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LOG.debug("target_wwns: %(tgt_wwns)s\n init_targ_map: %(itor_tgt_map)s",
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{'tgt_wwns': target_wwns,
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'itor_tgt_map': itor_tgt_map})
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return target_wwns, itor_tgt_map
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def get_pool_name(volume):
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return vol_utils.extract_host(volume.host, 'pool')
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def get_pool_name_from_host(host):
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return vol_utils.extract_host(host['host'], 'pool')
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def get_backend_name_from_volume(volume):
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return vol_utils.extract_host(volume.host, 'backend')
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def get_backend_name_from_host(host):
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return vol_utils.extract_host(host['host'], 'backend')
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def get_extra_spec(volume, spec_key):
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spec_value = None
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type_id = volume.volume_type_id
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if type_id is not None:
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extra_specs = volume_types.get_volume_type_extra_specs(type_id)
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if spec_key in extra_specs:
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spec_value = extra_specs[spec_key]
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return spec_value
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def ignore_exception(func, *args, **kwargs):
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try:
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func(*args, **kwargs)
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except Exception as ex:
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LOG.warning('Error occurred but ignored. Function: %(func_name)s, '
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'args: %(args)s, kwargs: %(kwargs)s, '
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'exception: %(ex)s.',
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{'func_name': func, 'args': args,
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'kwargs': kwargs, 'ex': ex})
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@contextlib.contextmanager
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def assure_cleanup(enter_func, exit_func, use_enter_return):
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"""Assures the resource is cleaned up. Used as a context.
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:param enter_func: the function to execute when entering the context.
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:param exit_func: the function to execute when leaving the context.
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:param use_enter_return: the flag indicates whether to pass the return
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value of enter_func in to the exit_func.
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"""
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enter_return = None
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try:
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if isinstance(enter_func, functools.partial):
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enter_func_name = enter_func.func.__name__
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else:
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enter_func_name = enter_func.__name__
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LOG.debug(('Entering context. Function: %(func_name)s, '
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'use_enter_return: %(use)s.'),
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{'func_name': enter_func_name,
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'use': use_enter_return})
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enter_return = enter_func()
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yield enter_return
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finally:
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if isinstance(exit_func, functools.partial):
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exit_func_name = exit_func.func.__name__
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else:
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exit_func_name = exit_func.__name__
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LOG.debug(('Exiting context. Function: %(func_name)s, '
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'use_enter_return: %(use)s.'),
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{'func_name': exit_func_name,
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'use': use_enter_return})
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if enter_return is not None:
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if use_enter_return:
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ignore_exception(exit_func, enter_return)
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else:
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ignore_exception(exit_func)
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def create_lookup_service():
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return zm_utils.create_lookup_service()
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def get_backend_qos_specs(volume):
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type_id = volume.volume_type_id
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if type_id is None:
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return None
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qos_specs = volume_types.get_volume_type_qos_specs(type_id)
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if qos_specs is None:
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return None
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qos_specs = qos_specs['qos_specs']
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if qos_specs is None:
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return None
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consumer = qos_specs['consumer']
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# Front end QoS specs are handled by nova. We ignore them here.
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if consumer not in BACKEND_QOS_CONSUMERS:
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return None
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max_iops = qos_specs['specs'].get(QOS_MAX_IOPS)
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max_bws = qos_specs['specs'].get(QOS_MAX_BWS)
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if max_iops is None and max_bws is None:
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return None
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return {
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'id': qos_specs['id'],
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QOS_MAX_IOPS: max_iops,
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QOS_MAX_BWS: max_bws,
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}
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def remove_empty(option, value_list):
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if value_list:
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value_list = list(filter(None, map(str.strip, value_list)))
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if not value_list:
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raise exception.InvalidConfigurationValue(option=option,
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value=value_list)
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return value_list
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return None
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def match_any(full, patterns):
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matched = list(
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filter(lambda x: any(fnmatch.fnmatchcase(x, p) for p in patterns),
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full))
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unmatched = list(
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filter(lambda x: not any(fnmatch.fnmatchcase(x, p) for p in patterns),
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full))
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unmatched_patterns = list(
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filter(lambda p: not any(fnmatch.fnmatchcase(x, p) for x in full),
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patterns))
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return matched, unmatched, unmatched_patterns
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def is_before_4_1(ver):
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return version.LooseVersion(ver) < version.LooseVersion('4.1')
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def lock_if(condition, lock_name):
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if condition:
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return coordination.synchronized(lock_name)
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else:
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return functools.partial
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def is_multiattach_to_host(volume_attachment, host_name):
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# When multiattach is enabled, a volume could be attached to two or more
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# instances which are hosted on one nova host.
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# Because unity cannot recognize the volume is attached to two or more
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# instances, we should keep the volume attached to the nova host until
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# the volume is detached from the last instance.
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if not volume_attachment:
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return False
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attachment = [a for a in volume_attachment
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if a.attach_status == fields.VolumeAttachStatus.ATTACHED and
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a.attached_host == host_name]
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return len(attachment) > 1
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