572 lines
22 KiB
Python
572 lines
22 KiB
Python
# Copyright (c) 2012 NetApp, Inc. All rights reserved.
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# Copyright (c) 2014 Ben Swartzlander. All rights reserved.
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# Copyright (c) 2014 Navneet Singh. All rights reserved.
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# Copyright (c) 2014 Clinton Knight. All rights reserved.
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# Copyright (c) 2014 Alex Meade. All rights reserved.
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# Copyright (c) 2014 Andrew Kerr. All rights reserved.
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# Copyright (c) 2014 Jeff Applewhite. 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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Volume driver library for NetApp 7/C-mode block storage systems.
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"""
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import sys
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import uuid
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from oslo.utils import excutils
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from oslo.utils import units
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import six
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from cinder import exception
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from cinder.i18n import _, _LE, _LI, _LW
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from cinder.openstack.common import log as logging
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from cinder.volume.drivers.netapp.dataontap.client.api import NaApiError
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from cinder.volume.drivers.netapp import options as na_opts
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from cinder.volume.drivers.netapp import utils as na_utils
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from cinder.volume import utils as volume_utils
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LOG = logging.getLogger(__name__)
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class NetAppLun(object):
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"""Represents a LUN on NetApp storage."""
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def __init__(self, handle, name, size, metadata_dict):
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self.handle = handle
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self.name = name
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self.size = size
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self.metadata = metadata_dict or {}
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def get_metadata_property(self, prop):
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"""Get the metadata property of a LUN."""
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if prop in self.metadata:
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return self.metadata[prop]
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name = self.name
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msg = _("No metadata property %(prop)s defined for the LUN %(name)s")
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msg_fmt = {'prop': prop, 'name': name}
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LOG.debug(msg % msg_fmt)
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def __str__(self, *args, **kwargs):
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return 'NetApp Lun[handle:%s, name:%s, size:%s, metadata:%s]'\
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% (self.handle, self.name, self.size, self.metadata)
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class NetAppBlockStorageLibrary(object):
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"""NetApp block storage library for Data ONTAP."""
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# do not increment this as it may be used in volume type definitions
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VERSION = "1.0.0"
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IGROUP_PREFIX = 'openstack-'
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REQUIRED_FLAGS = ['netapp_login', 'netapp_password',
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'netapp_server_hostname']
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def __init__(self, driver_name, driver_protocol, **kwargs):
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na_utils.validate_instantiation(**kwargs)
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self.driver_name = driver_name
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self.driver_protocol = driver_protocol
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self.zapi_client = None
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self._stats = {}
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self.lun_table = {}
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self.app_version = kwargs.get("app_version", "unknown")
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self.configuration = kwargs['configuration']
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self.configuration.append_config_values(na_opts.netapp_connection_opts)
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self.configuration.append_config_values(na_opts.netapp_basicauth_opts)
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self.configuration.append_config_values(na_opts.netapp_transport_opts)
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self.configuration.append_config_values(
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na_opts.netapp_provisioning_opts)
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def do_setup(self, context):
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na_utils.check_flags(self.REQUIRED_FLAGS, self.configuration)
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def check_for_setup_error(self):
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"""Check that the driver is working and can communicate.
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Discovers the LUNs on the NetApp server.
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"""
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lun_list = self.zapi_client.get_lun_list()
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self._extract_and_populate_luns(lun_list)
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LOG.debug("Success getting list of LUNs from server.")
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def get_pool(self, volume):
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"""Return pool name where volume resides.
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:param volume: The volume hosted by the driver.
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:return: Name of the pool where given volume is hosted.
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"""
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name = volume['name']
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metadata = self._get_lun_attr(name, 'metadata') or dict()
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return metadata.get('Volume', None)
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def create_volume(self, volume):
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"""Driver entry point for creating a new volume (Data ONTAP LUN)."""
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LOG.debug('create_volume on %s' % volume['host'])
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# get Data ONTAP volume name as pool name
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ontap_volume_name = volume_utils.extract_host(volume['host'],
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level='pool')
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if ontap_volume_name is None:
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msg = _("Pool is not available in the volume host field.")
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raise exception.InvalidHost(reason=msg)
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lun_name = volume['name']
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# start with default size, get requested size
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default_size = units.Mi * 100 # 100 MB
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size = default_size if not int(volume['size'])\
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else int(volume['size']) * units.Gi
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metadata = {'OsType': 'linux', 'SpaceReserved': 'true'}
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extra_specs = na_utils.get_volume_extra_specs(volume)
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qos_policy_group = extra_specs.pop('netapp:qos_policy_group', None) \
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if extra_specs else None
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# warn on obsolete extra specs
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na_utils.log_extra_spec_warnings(extra_specs)
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self._create_lun(ontap_volume_name, lun_name, size,
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metadata, qos_policy_group)
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LOG.debug('Created LUN with name %s' % lun_name)
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metadata['Path'] = '/vol/%s/%s' % (ontap_volume_name, lun_name)
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metadata['Volume'] = ontap_volume_name
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metadata['Qtree'] = None
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handle = self._create_lun_handle(metadata)
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self._add_lun_to_table(NetAppLun(handle, lun_name, size, metadata))
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def delete_volume(self, volume):
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"""Driver entry point for destroying existing volumes."""
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name = volume['name']
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metadata = self._get_lun_attr(name, 'metadata')
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if not metadata:
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msg = _LW("No entry in LUN table for volume/snapshot %(name)s.")
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msg_fmt = {'name': name}
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LOG.warning(msg % msg_fmt)
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return
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self.zapi_client.destroy_lun(metadata['Path'])
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self.lun_table.pop(name)
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def ensure_export(self, context, volume):
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"""Driver entry point to get the export info for an existing volume."""
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handle = self._get_lun_attr(volume['name'], 'handle')
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return {'provider_location': handle}
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def create_export(self, context, volume):
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"""Driver entry point to get the export info for a new volume."""
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handle = self._get_lun_attr(volume['name'], 'handle')
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return {'provider_location': handle}
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def remove_export(self, context, volume):
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"""Driver entry point to remove an export for a volume.
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Since exporting is idempotent in this driver, we have nothing
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to do for unexporting.
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"""
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pass
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def create_snapshot(self, snapshot):
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"""Driver entry point for creating a snapshot.
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This driver implements snapshots by using efficient single-file
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(LUN) cloning.
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"""
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vol_name = snapshot['volume_name']
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snapshot_name = snapshot['name']
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lun = self._get_lun_from_table(vol_name)
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self._clone_lun(lun.name, snapshot_name, 'false')
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def delete_snapshot(self, snapshot):
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"""Driver entry point for deleting a snapshot."""
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self.delete_volume(snapshot)
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LOG.debug("Snapshot %s deletion successful" % snapshot['name'])
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def create_volume_from_snapshot(self, volume, snapshot):
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"""Driver entry point for creating a new volume from a snapshot.
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Many would call this "cloning" and in fact we use cloning to implement
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this feature.
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"""
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vol_size = volume['size']
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snap_size = snapshot['volume_size']
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snapshot_name = snapshot['name']
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new_name = volume['name']
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self._clone_lun(snapshot_name, new_name, 'true')
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if vol_size != snap_size:
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try:
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self.extend_volume(volume, volume['size'])
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except Exception:
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with excutils.save_and_reraise_exception():
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LOG.error(
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_LE("Resizing %s failed. Cleaning volume."), new_name)
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self.delete_volume(volume)
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def _create_lun(self, volume_name, lun_name, size,
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metadata, qos_policy_group=None):
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"""Creates a LUN, handling Data ONTAP differences as needed."""
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raise NotImplementedError()
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def _create_lun_handle(self, metadata):
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"""Returns LUN handle based on filer type."""
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raise NotImplementedError()
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def _extract_and_populate_luns(self, api_luns):
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"""Extracts the LUNs from API.
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Populates in the LUN table.
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"""
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for lun in api_luns:
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meta_dict = self._create_lun_meta(lun)
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path = lun.get_child_content('path')
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(_rest, _splitter, name) = path.rpartition('/')
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handle = self._create_lun_handle(meta_dict)
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size = lun.get_child_content('size')
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discovered_lun = NetAppLun(handle, name, size, meta_dict)
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self._add_lun_to_table(discovered_lun)
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def _map_lun(self, name, initiator, initiator_type='iscsi', lun_id=None):
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"""Maps LUN to the initiator and returns LUN id assigned."""
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metadata = self._get_lun_attr(name, 'metadata')
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os = metadata['OsType']
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path = metadata['Path']
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if self._check_allowed_os(os):
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os = os
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else:
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os = 'default'
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igroup_name = self._get_or_create_igroup(initiator,
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initiator_type, os)
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try:
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return self.zapi_client.map_lun(path, igroup_name, lun_id=lun_id)
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except NaApiError:
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exc_info = sys.exc_info()
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(_igroup, lun_id) = self._find_mapped_lun_igroup(path, initiator)
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if lun_id is not None:
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return lun_id
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else:
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raise exc_info[0], exc_info[1], exc_info[2]
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def _unmap_lun(self, path, initiator):
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"""Unmaps a LUN from given initiator."""
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(igroup_name, _lun_id) = self._find_mapped_lun_igroup(path, initiator)
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self.zapi_client.unmap_lun(path, igroup_name)
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def _find_mapped_lun_igroup(self, path, initiator, os=None):
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"""Find the igroup for mapped LUN with initiator."""
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raise NotImplementedError()
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def _get_or_create_igroup(self, initiator, initiator_type='iscsi',
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os='default'):
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"""Checks for an igroup for an initiator.
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Creates igroup if not found.
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"""
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igroups = self.zapi_client.get_igroup_by_initiator(initiator=initiator)
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igroup_name = None
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for igroup in igroups:
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if igroup['initiator-group-os-type'] == os:
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if igroup['initiator-group-type'] == initiator_type or \
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igroup['initiator-group-type'] == 'mixed':
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if igroup['initiator-group-name'].startswith(
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self.IGROUP_PREFIX):
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igroup_name = igroup['initiator-group-name']
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break
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if not igroup_name:
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igroup_name = self.IGROUP_PREFIX + six.text_type(uuid.uuid4())
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self.zapi_client.create_igroup(igroup_name, initiator_type, os)
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self.zapi_client.add_igroup_initiator(igroup_name, initiator)
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return igroup_name
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def _check_allowed_os(self, os):
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"""Checks if the os type supplied is NetApp supported."""
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if os in ['linux', 'aix', 'hpux', 'windows', 'solaris',
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'netware', 'vmware', 'openvms', 'xen', 'hyper_v']:
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return True
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else:
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return False
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def _add_lun_to_table(self, lun):
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"""Adds LUN to cache table."""
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if not isinstance(lun, NetAppLun):
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msg = _("Object is not a NetApp LUN.")
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raise exception.VolumeBackendAPIException(data=msg)
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self.lun_table[lun.name] = lun
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def _get_lun_from_table(self, name):
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"""Gets LUN from cache table.
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Refreshes cache if LUN not found in cache.
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"""
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lun = self.lun_table.get(name)
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if lun is None:
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lun_list = self.zapi_client.get_lun_list()
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self._extract_and_populate_luns(lun_list)
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lun = self.lun_table.get(name)
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if lun is None:
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raise exception.VolumeNotFound(volume_id=name)
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return lun
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def _clone_lun(self, name, new_name, space_reserved='true',
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src_block=0, dest_block=0, block_count=0):
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"""Clone LUN with the given name to the new name."""
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raise NotImplementedError()
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def _get_lun_attr(self, name, attr):
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"""Get the LUN attribute if found else None."""
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try:
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attr = getattr(self._get_lun_from_table(name), attr)
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return attr
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except exception.VolumeNotFound as e:
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LOG.error(_LE("Message: %s"), e.msg)
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except Exception as e:
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LOG.error(_LE("Error getting LUN attribute. Exception: %s"),
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e.__str__())
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return None
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def _create_lun_meta(self, lun):
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raise NotImplementedError()
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def create_cloned_volume(self, volume, src_vref):
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"""Creates a clone of the specified volume."""
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vol_size = volume['size']
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src_vol = self._get_lun_from_table(src_vref['name'])
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src_vol_size = src_vref['size']
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new_name = volume['name']
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self._clone_lun(src_vol.name, new_name, 'true')
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if vol_size != src_vol_size:
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try:
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self.extend_volume(volume, volume['size'])
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except Exception:
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with excutils.save_and_reraise_exception():
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LOG.error(
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_LE("Resizing %s failed. Cleaning volume."), new_name)
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self.delete_volume(volume)
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def get_volume_stats(self, refresh=False):
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"""Get volume stats.
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If 'refresh' is True, run update the stats first.
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"""
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if refresh:
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self._update_volume_stats()
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return self._stats
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def _update_volume_stats(self):
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raise NotImplementedError()
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def extend_volume(self, volume, new_size):
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"""Extend an existing volume to the new size."""
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name = volume['name']
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lun = self._get_lun_from_table(name)
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path = lun.metadata['Path']
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curr_size_bytes = six.text_type(lun.size)
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new_size_bytes = six.text_type(int(new_size) * units.Gi)
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# Reused by clone scenarios.
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# Hence comparing the stored size.
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if curr_size_bytes != new_size_bytes:
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lun_geometry = self.zapi_client.get_lun_geometry(path)
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if (lun_geometry and lun_geometry.get("max_resize")
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and int(lun_geometry.get("max_resize")) >=
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int(new_size_bytes)):
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self.zapi_client.do_direct_resize(path, new_size_bytes)
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else:
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self._do_sub_clone_resize(path, new_size_bytes)
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self.lun_table[name].size = new_size_bytes
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else:
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LOG.info(_LI("No need to extend volume %s"
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" as it is already the requested new size."), name)
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def _get_vol_option(self, volume_name, option_name):
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"""Get the value for the volume option."""
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value = None
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options = self.zapi_client.get_volume_options(volume_name)
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for opt in options:
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if opt.get_child_content('name') == option_name:
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value = opt.get_child_content('value')
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break
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return value
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def _do_sub_clone_resize(self, path, new_size_bytes):
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"""Does sub LUN clone after verification.
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Clones the block ranges and swaps
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the LUNs also deletes older LUN
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after a successful clone.
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"""
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seg = path.split("/")
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LOG.info(_LI("Resizing LUN %s to new size using clone operation."),
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seg[-1])
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name = seg[-1]
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vol_name = seg[2]
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lun = self._get_lun_from_table(name)
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metadata = lun.metadata
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compression = self._get_vol_option(vol_name, 'compression')
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if compression == "on":
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msg = _('%s cannot be resized using clone operation'
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' as it is hosted on compressed volume')
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raise exception.VolumeBackendAPIException(data=msg % name)
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else:
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block_count = self._get_lun_block_count(path)
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if block_count == 0:
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msg = _('%s cannot be resized using clone operation'
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' as it contains no blocks.')
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raise exception.VolumeBackendAPIException(data=msg % name)
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new_lun = 'new-%s' % name
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self.zapi_client.create_lun(vol_name, new_lun, new_size_bytes,
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metadata)
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try:
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self._clone_lun(name, new_lun, block_count=block_count)
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self._post_sub_clone_resize(path)
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except Exception:
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with excutils.save_and_reraise_exception():
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new_path = '/vol/%s/%s' % (vol_name, new_lun)
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self.zapi_client.destroy_lun(new_path)
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def _post_sub_clone_resize(self, path):
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"""Try post sub clone resize in a transactional manner."""
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st_tm_mv, st_nw_mv, st_del_old = None, None, None
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seg = path.split("/")
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LOG.info(_LI("Post clone resize LUN %s"), seg[-1])
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new_lun = 'new-%s' % (seg[-1])
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tmp_lun = 'tmp-%s' % (seg[-1])
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tmp_path = "/vol/%s/%s" % (seg[2], tmp_lun)
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new_path = "/vol/%s/%s" % (seg[2], new_lun)
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try:
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st_tm_mv = self.zapi_client.move_lun(path, tmp_path)
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st_nw_mv = self.zapi_client.move_lun(new_path, path)
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st_del_old = self.zapi_client.destroy_lun(tmp_path)
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except Exception as e:
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if st_tm_mv is None:
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msg = _("Failure staging LUN %s to tmp.")
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raise exception.VolumeBackendAPIException(data=msg % (seg[-1]))
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else:
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if st_nw_mv is None:
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self.zapi_client.move_lun(tmp_path, path)
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msg = _("Failure moving new cloned LUN to %s.")
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raise exception.VolumeBackendAPIException(
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data=msg % (seg[-1]))
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|
elif st_del_old is None:
|
|
LOG.error(_LE("Failure deleting staged tmp LUN %s."),
|
|
tmp_lun)
|
|
else:
|
|
LOG.error(_LE("Unknown exception in"
|
|
" post clone resize LUN %s."), seg[-1])
|
|
LOG.error(_LE("Exception details: %s") % (e.__str__()))
|
|
|
|
def _get_lun_block_count(self, path):
|
|
"""Gets block counts for the LUN."""
|
|
LOG.debug("Getting LUN block count.")
|
|
lun_infos = self.zapi_client.get_lun_by_args(path=path)
|
|
if not lun_infos:
|
|
seg = path.split('/')
|
|
msg = _('Failure getting LUN info for %s.')
|
|
raise exception.VolumeBackendAPIException(data=msg % seg[-1])
|
|
lun_info = lun_infos[-1]
|
|
bs = int(lun_info.get_child_content('block-size'))
|
|
ls = int(lun_info.get_child_content('size'))
|
|
block_count = ls / bs
|
|
return block_count
|
|
|
|
def initialize_connection_iscsi(self, volume, connector):
|
|
"""Driver entry point to attach a volume to an instance.
|
|
|
|
Do the LUN masking on the storage system so the initiator can access
|
|
the LUN on the target. Also return the iSCSI properties so the
|
|
initiator can find the LUN. This implementation does not call
|
|
_get_iscsi_properties() to get the properties because cannot store the
|
|
LUN number in the database. We only find out what the LUN number will
|
|
be during this method call so we construct the properties dictionary
|
|
ourselves.
|
|
"""
|
|
|
|
initiator_name = connector['initiator']
|
|
name = volume['name']
|
|
lun_id = self._map_lun(name, initiator_name, 'iscsi', None)
|
|
msg = _("Mapped LUN %(name)s to the initiator %(initiator_name)s")
|
|
msg_fmt = {'name': name, 'initiator_name': initiator_name}
|
|
LOG.debug(msg % msg_fmt)
|
|
iqn = self.zapi_client.get_iscsi_service_details()
|
|
target_details_list = self.zapi_client.get_target_details()
|
|
msg = _("Successfully fetched target details for LUN %(name)s and "
|
|
"initiator %(initiator_name)s")
|
|
msg_fmt = {'name': name, 'initiator_name': initiator_name}
|
|
LOG.debug(msg % msg_fmt)
|
|
|
|
if not target_details_list:
|
|
msg = _('Failed to get LUN target details for the LUN %s')
|
|
raise exception.VolumeBackendAPIException(data=msg % name)
|
|
target_details = None
|
|
for tgt_detail in target_details_list:
|
|
if tgt_detail.get('interface-enabled', 'true') == 'true':
|
|
target_details = tgt_detail
|
|
break
|
|
if not target_details:
|
|
target_details = target_details_list[0]
|
|
|
|
if not target_details['address'] and target_details['port']:
|
|
msg = _('Failed to get target portal for the LUN %s')
|
|
raise exception.VolumeBackendAPIException(data=msg % name)
|
|
if not iqn:
|
|
msg = _('Failed to get target IQN for the LUN %s')
|
|
raise exception.VolumeBackendAPIException(data=msg % name)
|
|
|
|
properties = {}
|
|
properties['target_discovered'] = False
|
|
(address, port) = (target_details['address'], target_details['port'])
|
|
properties['target_portal'] = '%s:%s' % (address, port)
|
|
properties['target_iqn'] = iqn
|
|
properties['target_lun'] = lun_id
|
|
properties['volume_id'] = volume['id']
|
|
|
|
auth = volume['provider_auth']
|
|
if auth:
|
|
(auth_method, auth_username, auth_secret) = auth.split()
|
|
properties['auth_method'] = auth_method
|
|
properties['auth_username'] = auth_username
|
|
properties['auth_password'] = auth_secret
|
|
|
|
return {
|
|
'driver_volume_type': 'iscsi',
|
|
'data': properties,
|
|
}
|
|
|
|
def terminate_connection_iscsi(self, volume, connector, **kwargs):
|
|
"""Driver entry point to unattach a volume from an instance.
|
|
|
|
Unmask the LUN on the storage system so the given initiator can no
|
|
longer access it.
|
|
"""
|
|
|
|
initiator_name = connector['initiator']
|
|
name = volume['name']
|
|
metadata = self._get_lun_attr(name, 'metadata')
|
|
path = metadata['Path']
|
|
self._unmap_lun(path, initiator_name)
|
|
msg = _("Unmapped LUN %(name)s from the initiator %(initiator_name)s")
|
|
msg_fmt = {'name': name, 'initiator_name': initiator_name}
|
|
LOG.debug(msg % msg_fmt)
|