926 lines
35 KiB
Python
926 lines
35 KiB
Python
# Copyright 2010 United States Government as represented by the
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# Administrator of the National Aeronautics and Space Administration.
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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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Drivers for volumes.
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"""
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import time
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from oslo.config import cfg
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from cinder.brick.iscsi import iscsi
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from cinder import exception
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from cinder.image import image_utils
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from cinder.openstack.common import excutils
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from cinder.openstack.common import fileutils
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from cinder.openstack.common import log as logging
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from cinder.openstack.common import processutils
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from cinder import utils
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from cinder.volume import rpcapi as volume_rpcapi
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from cinder.volume import utils as volume_utils
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LOG = logging.getLogger(__name__)
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volume_opts = [
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cfg.IntOpt('num_shell_tries',
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default=3,
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help='number of times to attempt to run flakey shell commands'),
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cfg.IntOpt('reserved_percentage',
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default=0,
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help='The percentage of backend capacity is reserved'),
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cfg.IntOpt('iscsi_num_targets',
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default=100,
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help='The maximum number of iscsi target ids per host'),
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cfg.StrOpt('iscsi_target_prefix',
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default='iqn.2010-10.org.openstack:',
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help='prefix for iscsi volumes'),
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cfg.StrOpt('iscsi_ip_address',
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default='$my_ip',
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help='The IP address that the iSCSI daemon is listening on'),
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cfg.IntOpt('iscsi_port',
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default=3260,
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help='The port that the iSCSI daemon is listening on'),
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cfg.IntOpt('num_volume_device_scan_tries',
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deprecated_name='num_iscsi_scan_tries',
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default=3,
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help='The maximum number of times to rescan targets'
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' to find volume'),
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cfg.StrOpt('volume_backend_name',
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default=None,
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help='The backend name for a given driver implementation'),
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cfg.BoolOpt('use_multipath_for_image_xfer',
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default=False,
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help='Do we attach/detach volumes in cinder using multipath '
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'for volume to image and image to volume transfers?'),
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cfg.StrOpt('volume_clear',
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default='zero',
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help='Method used to wipe old voumes (valid options are: '
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'none, zero, shred)'),
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cfg.IntOpt('volume_clear_size',
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default=0,
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help='Size in MiB to wipe at start of old volumes. 0 => all'),
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cfg.StrOpt('iscsi_helper',
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default='tgtadm',
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help='iscsi target user-land tool to use'),
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cfg.StrOpt('volumes_dir',
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default='$state_path/volumes',
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help='Volume configuration file storage '
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'directory'),
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cfg.StrOpt('iet_conf',
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default='/etc/iet/ietd.conf',
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help='IET configuration file'),
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cfg.StrOpt('lio_initiator_iqns',
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default='',
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help=('Comma-separated list of initiator IQNs '
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'allowed to connect to the '
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'iSCSI target. (From Nova compute nodes.)')),
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cfg.StrOpt('iscsi_iotype',
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default='fileio',
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help=('Sets the behavior of the iSCSI target '
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'to either perform blockio or fileio '
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'optionally, auto can be set and Cinder '
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'will autodetect type of backing device')),
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cfg.StrOpt('volume_dd_blocksize',
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default='1M',
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help='The default block size used when copying/clearing '
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'volumes'),
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]
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# for backward compatibility
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iser_opts = [
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cfg.IntOpt('num_iser_scan_tries',
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default=3,
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help='The maximum number of times to rescan iSER target'
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'to find volume'),
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cfg.IntOpt('iser_num_targets',
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default=100,
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help='The maximum number of iser target ids per host'),
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cfg.StrOpt('iser_target_prefix',
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default='iqn.2010-10.org.iser.openstack:',
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help='prefix for iser volumes'),
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cfg.StrOpt('iser_ip_address',
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default='$my_ip',
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help='The IP address that the iSER daemon is listening on'),
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cfg.IntOpt('iser_port',
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default=3260,
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help='The port that the iSER daemon is listening on'),
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cfg.StrOpt('iser_helper',
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default='tgtadm',
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help='iser target user-land tool to use'),
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]
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CONF = cfg.CONF
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CONF.register_opts(volume_opts)
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CONF.register_opts(iser_opts)
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class VolumeDriver(object):
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"""Executes commands relating to Volumes."""
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VERSION = "N/A"
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def __init__(self, execute=utils.execute, *args, **kwargs):
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# NOTE(vish): db is set by Manager
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self.db = kwargs.get('db')
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self.configuration = kwargs.get('configuration', None)
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if self.configuration:
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self.configuration.append_config_values(volume_opts)
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self.set_execute(execute)
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self._stats = {}
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# set True by manager after successful check_for_setup
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self._initialized = False
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def set_execute(self, execute):
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self._execute = execute
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def set_initialized(self):
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self._initialized = True
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@property
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def initialized(self):
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return self._initialized
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def get_version(self):
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"""Get the current version of this driver."""
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return self.VERSION
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def _is_non_recoverable(self, err, non_recoverable_list):
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for item in non_recoverable_list:
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if item in err:
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return True
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return False
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def _try_execute(self, *command, **kwargs):
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# NOTE(vish): Volume commands can partially fail due to timing, but
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# running them a second time on failure will usually
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# recover nicely.
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non_recoverable = kwargs.pop('no_retry_list', [])
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tries = 0
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while True:
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try:
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self._execute(*command, **kwargs)
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return True
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except processutils.ProcessExecutionError as ex:
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tries = tries + 1
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if tries >= self.configuration.num_shell_tries or\
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self._is_non_recoverable(ex.stderr, non_recoverable):
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raise
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LOG.exception(_("Recovering from a failed execute. "
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"Try number %s"), tries)
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time.sleep(tries ** 2)
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def check_for_setup_error(self):
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raise NotImplementedError()
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def create_volume(self, volume):
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"""Creates a volume. Can optionally return a Dictionary of
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changes to the volume object to be persisted.
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"""
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raise NotImplementedError()
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def create_volume_from_snapshot(self, volume, snapshot):
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"""Creates a volume from a snapshot."""
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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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raise NotImplementedError()
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def delete_volume(self, volume):
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"""Deletes a volume."""
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raise NotImplementedError()
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def create_snapshot(self, snapshot):
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"""Creates a snapshot."""
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raise NotImplementedError()
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def delete_snapshot(self, snapshot):
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"""Deletes a snapshot."""
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raise NotImplementedError()
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def local_path(self, volume):
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raise NotImplementedError()
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def ensure_export(self, context, volume):
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"""Synchronously recreates an export for a volume."""
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raise NotImplementedError()
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def create_export(self, context, volume):
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"""Exports the volume. Can optionally return a Dictionary of changes
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to the volume object to be persisted.
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"""
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raise NotImplementedError()
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def remove_export(self, context, volume):
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"""Removes an export for a volume."""
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raise NotImplementedError()
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def initialize_connection(self, volume, connector):
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"""Allow connection to connector and return connection info."""
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raise NotImplementedError()
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def terminate_connection(self, volume, connector, **kwargs):
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"""Disallow connection from connector"""
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raise NotImplementedError()
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def attach_volume(self, context, volume, instance_uuid, host_name,
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mountpoint):
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"""Callback for volume attached to instance or host."""
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pass
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def detach_volume(self, context, volume):
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"""Callback for volume detached."""
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pass
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def get_volume_stats(self, refresh=False):
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"""Return the current state of the volume service. If 'refresh' is
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True, run the update first.
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"""
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return None
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def do_setup(self, context):
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"""Any initialization the volume driver does while starting."""
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pass
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def validate_connector(self, connector):
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"""Fail if connector doesn't contain all the data needed by driver."""
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pass
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def _copy_volume_data_cleanup(self, context, volume, properties,
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attach_info, remote, force=False):
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self._detach_volume(attach_info)
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if remote:
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rpcapi = volume_rpcapi.VolumeAPI()
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rpcapi.terminate_connection(context, volume, properties,
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force=force)
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else:
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self.terminate_connection(volume, properties, force=False)
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def copy_volume_data(self, context, src_vol, dest_vol, remote=None):
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"""Copy data from src_vol to dest_vol."""
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LOG.debug(_('copy_data_between_volumes %(src)s -> %(dest)s.')
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% {'src': src_vol['name'], 'dest': dest_vol['name']})
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properties = utils.brick_get_connector_properties()
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dest_remote = True if remote in ['dest', 'both'] else False
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dest_orig_status = dest_vol['status']
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try:
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dest_attach_info = self._attach_volume(context,
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dest_vol,
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properties,
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remote=dest_remote)
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except Exception:
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with excutils.save_and_reraise_exception():
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msg = _("Failed to attach volume %(vol)s")
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LOG.error(msg % {'vol': dest_vol['id']})
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self.db.volume_update(context, dest_vol['id'],
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{'status': dest_orig_status})
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src_remote = True if remote in ['src', 'both'] else False
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src_orig_status = src_vol['status']
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try:
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src_attach_info = self._attach_volume(context,
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src_vol,
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properties,
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remote=src_remote)
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except Exception:
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with excutils.save_and_reraise_exception():
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msg = _("Failed to attach volume %(vol)s")
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LOG.error(msg % {'vol': src_vol['id']})
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self.db.volume_update(context, src_vol['id'],
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{'status': src_orig_status})
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self._copy_volume_data_cleanup(context, dest_vol, properties,
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dest_attach_info, dest_remote,
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force=True)
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try:
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size_in_mb = int(src_vol['size']) * 1024 # vol size is in GB
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volume_utils.copy_volume(
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src_attach_info['device']['path'],
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dest_attach_info['device']['path'],
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size_in_mb,
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self.configuration.volume_dd_blocksize)
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copy_error = False
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except Exception:
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with excutils.save_and_reraise_exception():
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msg = _("Failed to copy volume %(src)s to %(dest)d")
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LOG.error(msg % {'src': src_vol['id'], 'dest': dest_vol['id']})
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copy_error = True
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finally:
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self._copy_volume_data_cleanup(context, dest_vol, properties,
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dest_attach_info, dest_remote,
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force=copy_error)
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self._copy_volume_data_cleanup(context, src_vol, properties,
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src_attach_info, src_remote,
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force=copy_error)
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def copy_image_to_volume(self, context, volume, image_service, image_id):
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"""Fetch the image from image_service and write it to the volume."""
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LOG.debug(_('copy_image_to_volume %s.') % volume['name'])
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properties = utils.brick_get_connector_properties()
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attach_info = self._attach_volume(context, volume, properties)
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try:
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image_utils.fetch_to_raw(context,
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image_service,
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image_id,
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attach_info['device']['path'],
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self.configuration.volume_dd_blocksize,
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size=volume['size'])
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finally:
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self._detach_volume(attach_info)
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self.terminate_connection(volume, properties)
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def copy_volume_to_image(self, context, volume, image_service, image_meta):
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"""Copy the volume to the specified image."""
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LOG.debug(_('copy_volume_to_image %s.') % volume['name'])
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properties = utils.brick_get_connector_properties()
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attach_info = self._attach_volume(context, volume, properties)
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try:
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image_utils.upload_volume(context,
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image_service,
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image_meta,
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attach_info['device']['path'])
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finally:
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self._detach_volume(attach_info)
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self.terminate_connection(volume, properties)
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def _attach_volume(self, context, volume, properties, remote=False):
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"""Attach the volume."""
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if remote:
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rpcapi = volume_rpcapi.VolumeAPI()
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conn = rpcapi.initialize_connection(context, volume, properties)
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else:
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conn = self.initialize_connection(volume, properties)
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# Use Brick's code to do attach/detach
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use_multipath = self.configuration.use_multipath_for_image_xfer
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device_scan_attempts = self.configuration.num_volume_device_scan_tries
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protocol = conn['driver_volume_type']
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connector = utils.brick_get_connector(protocol,
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use_multipath=use_multipath,
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device_scan_attempts=
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device_scan_attempts,
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conn=conn)
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device = connector.connect_volume(conn['data'])
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host_device = device['path']
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if not connector.check_valid_device(host_device):
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raise exception.DeviceUnavailable(path=host_device,
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reason=(_("Unable to access "
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"the backend storage "
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"via the path "
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"%(path)s.") %
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{'path': host_device}))
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return {'conn': conn, 'device': device, 'connector': connector}
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def _detach_volume(self, attach_info):
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"""Disconnect the volume from the host."""
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# Use Brick's code to do attach/detach
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connector = attach_info['connector']
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connector.disconnect_volume(attach_info['conn']['data'],
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attach_info['device'])
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def clone_image(self, volume, image_location, image_id, image_meta):
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"""Create a volume efficiently from an existing image.
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image_location is a string whose format depends on the
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image service backend in use. The driver should use it
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to determine whether cloning is possible.
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image_id is a string which represents id of the image.
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It can be used by the driver to introspect internal
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stores or registry to do an efficient image clone.
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image_meta is a dictionary that includes 'disk_format' (e.g.
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raw, qcow2) and other image attributes that allow drivers to
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decide whether they can clone the image without first requiring
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conversion.
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Returns a dict of volume properties eg. provider_location,
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boolean indicating whether cloning occurred
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"""
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return None, False
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def backup_volume(self, context, backup, backup_service):
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"""Create a new backup from an existing volume."""
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volume = self.db.volume_get(context, backup['volume_id'])
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LOG.debug(_('Creating a new backup for volume %s.') %
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volume['name'])
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properties = utils.brick_get_connector_properties()
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attach_info = self._attach_volume(context, volume, properties)
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try:
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volume_path = attach_info['device']['path']
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with utils.temporary_chown(volume_path):
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with fileutils.file_open(volume_path) as volume_file:
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backup_service.backup(backup, volume_file)
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finally:
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self._detach_volume(attach_info)
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self.terminate_connection(volume, properties)
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def restore_backup(self, context, backup, volume, backup_service):
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"""Restore an existing backup to a new or existing volume."""
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LOG.debug(_('Restoring backup %(backup)s to '
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'volume %(volume)s.') %
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{'backup': backup['id'],
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'volume': volume['name']})
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properties = utils.brick_get_connector_properties()
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attach_info = self._attach_volume(context, volume, properties)
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try:
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volume_path = attach_info['device']['path']
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with utils.temporary_chown(volume_path):
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with fileutils.file_open(volume_path, 'wb') as volume_file:
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backup_service.restore(backup, volume['id'], volume_file)
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finally:
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self._detach_volume(attach_info)
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self.terminate_connection(volume, properties)
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def clear_download(self, context, volume):
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"""Clean up after an interrupted image copy."""
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pass
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def extend_volume(self, volume, new_size):
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msg = _("Extend volume not implemented")
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raise NotImplementedError(msg)
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def migrate_volume(self, context, volume, host):
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"""Migrate the volume to the specified host.
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Returns a boolean indicating whether the migration occurred, as well as
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model_update.
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:param ctxt: Context
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:param volume: A dictionary describing the volume to migrate
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:param host: A dictionary describing the host to migrate to, where
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host['host'] is its name, and host['capabilities'] is a
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dictionary of its reported capabilities.
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"""
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return (False, None)
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def retype(self, context, volume, new_type, diff, host):
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"""Convert the volume to be of the new type.
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Returns a boolean indicating whether the retype occurred.
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:param ctxt: Context
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:param volume: A dictionary describing the volume to migrate
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:param new_type: A dictionary describing the volume type to convert to
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:param diff: A dictionary with the difference between the two types
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:param host: A dictionary describing the host to migrate to, where
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host['host'] is its name, and host['capabilities'] is a
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dictionary of its reported capabilities.
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"""
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return False
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def accept_transfer(self, context, volume, new_user, new_project):
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"""Accept the transfer of a volume for a new user/project."""
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pass
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class ISCSIDriver(VolumeDriver):
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"""Executes commands relating to ISCSI volumes.
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We make use of model provider properties as follows:
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``provider_location``
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|
if present, contains the iSCSI target information in the same
|
|
format as an ietadm discovery
|
|
i.e. '<ip>:<port>,<portal> <target IQN>'
|
|
|
|
``provider_auth``
|
|
if present, contains a space-separated triple:
|
|
'<auth method> <auth username> <auth password>'.
|
|
`CHAP` is the only auth_method in use at the moment.
|
|
"""
|
|
|
|
def __init__(self, *args, **kwargs):
|
|
super(ISCSIDriver, self).__init__(*args, **kwargs)
|
|
|
|
def _do_iscsi_discovery(self, volume):
|
|
#TODO(justinsb): Deprecate discovery and use stored info
|
|
#NOTE(justinsb): Discovery won't work with CHAP-secured targets (?)
|
|
LOG.warn(_("ISCSI provider_location not stored, using discovery"))
|
|
|
|
volume_name = volume['name']
|
|
|
|
try:
|
|
# NOTE(griff) We're doing the split straight away which should be
|
|
# safe since using '@' in hostname is considered invalid
|
|
|
|
(out, _err) = self._execute('iscsiadm', '-m', 'discovery',
|
|
'-t', 'sendtargets', '-p',
|
|
volume['host'].split('@')[0],
|
|
run_as_root=True)
|
|
except processutils.ProcessExecutionError as ex:
|
|
LOG.error(_("ISCSI discovery attempt failed for:%s") %
|
|
volume['host'].split('@')[0])
|
|
LOG.debug(_("Error from iscsiadm -m discovery: %s") % ex.stderr)
|
|
return None
|
|
|
|
for target in out.splitlines():
|
|
if (self.configuration.iscsi_ip_address in target
|
|
and volume_name in target):
|
|
return target
|
|
return None
|
|
|
|
def _get_iscsi_properties(self, volume):
|
|
"""Gets iscsi configuration
|
|
|
|
We ideally get saved information in the volume entity, but fall back
|
|
to discovery if need be. Discovery may be completely removed in future
|
|
The properties are:
|
|
|
|
:target_discovered: boolean indicating whether discovery was used
|
|
|
|
:target_iqn: the IQN of the iSCSI target
|
|
|
|
:target_portal: the portal of the iSCSI target
|
|
|
|
:target_lun: the lun of the iSCSI target
|
|
|
|
:volume_id: the id of the volume (currently used by xen)
|
|
|
|
:auth_method:, :auth_username:, :auth_password:
|
|
|
|
the authentication details. Right now, either auth_method is not
|
|
present meaning no authentication, or auth_method == `CHAP`
|
|
meaning use CHAP with the specified credentials.
|
|
|
|
:access_mode: the volume access mode allow client used
|
|
('rw' or 'ro' currently supported)
|
|
"""
|
|
|
|
properties = {}
|
|
|
|
location = volume['provider_location']
|
|
|
|
if location:
|
|
# provider_location is the same format as iSCSI discovery output
|
|
properties['target_discovered'] = False
|
|
else:
|
|
location = self._do_iscsi_discovery(volume)
|
|
|
|
if not location:
|
|
msg = (_("Could not find iSCSI export for volume %s") %
|
|
(volume['name']))
|
|
raise exception.InvalidVolume(reason=msg)
|
|
|
|
LOG.debug(_("ISCSI Discovery: Found %s") % (location))
|
|
properties['target_discovered'] = True
|
|
|
|
results = location.split(" ")
|
|
properties['target_portal'] = results[0].split(",")[0]
|
|
properties['target_iqn'] = results[1]
|
|
try:
|
|
properties['target_lun'] = int(results[2])
|
|
except (IndexError, ValueError):
|
|
if (self.configuration.volume_driver in
|
|
['cinder.volume.drivers.lvm.LVMISCSIDriver',
|
|
'cinder.volume.drivers.lvm.ThinLVMVolumeDriver'] and
|
|
self.configuration.iscsi_helper == 'tgtadm'):
|
|
properties['target_lun'] = 1
|
|
else:
|
|
properties['target_lun'] = 0
|
|
|
|
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
|
|
|
|
geometry = volume.get('provider_geometry', None)
|
|
if geometry:
|
|
(physical_block_size, logical_block_size) = geometry.split()
|
|
properties['physical_block_size'] = physical_block_size
|
|
properties['logical_block_size'] = logical_block_size
|
|
|
|
encryption_key_id = volume.get('encryption_key_id', None)
|
|
properties['encrypted'] = encryption_key_id is not None
|
|
|
|
return properties
|
|
|
|
def _run_iscsiadm(self, iscsi_properties, iscsi_command, **kwargs):
|
|
check_exit_code = kwargs.pop('check_exit_code', 0)
|
|
(out, err) = self._execute('iscsiadm', '-m', 'node', '-T',
|
|
iscsi_properties['target_iqn'],
|
|
'-p', iscsi_properties['target_portal'],
|
|
*iscsi_command, run_as_root=True,
|
|
check_exit_code=check_exit_code)
|
|
LOG.debug("iscsiadm %s: stdout=%s stderr=%s" %
|
|
(iscsi_command, out, err))
|
|
return (out, err)
|
|
|
|
def _run_iscsiadm_bare(self, iscsi_command, **kwargs):
|
|
check_exit_code = kwargs.pop('check_exit_code', 0)
|
|
(out, err) = self._execute('iscsiadm',
|
|
*iscsi_command,
|
|
run_as_root=True,
|
|
check_exit_code=check_exit_code)
|
|
LOG.debug("iscsiadm %s: stdout=%s stderr=%s" %
|
|
(iscsi_command, out, err))
|
|
return (out, err)
|
|
|
|
def _iscsiadm_update(self, iscsi_properties, property_key, property_value,
|
|
**kwargs):
|
|
iscsi_command = ('--op', 'update', '-n', property_key,
|
|
'-v', property_value)
|
|
return self._run_iscsiadm(iscsi_properties, iscsi_command, **kwargs)
|
|
|
|
def initialize_connection(self, volume, connector):
|
|
"""Initializes the connection and returns connection info.
|
|
|
|
The iscsi driver returns a driver_volume_type of 'iscsi'.
|
|
The format of the driver data is defined in _get_iscsi_properties.
|
|
Example return value::
|
|
|
|
{
|
|
'driver_volume_type': 'iscsi'
|
|
'data': {
|
|
'target_discovered': True,
|
|
'target_iqn': 'iqn.2010-10.org.openstack:volume-00000001',
|
|
'target_portal': '127.0.0.0.1:3260',
|
|
'volume_id': 1,
|
|
'access_mode': 'rw'
|
|
}
|
|
}
|
|
|
|
"""
|
|
|
|
if CONF.iscsi_helper == 'lioadm':
|
|
self.tgtadm.initialize_connection(volume, connector)
|
|
|
|
iscsi_properties = self._get_iscsi_properties(volume)
|
|
return {
|
|
'driver_volume_type': 'iscsi',
|
|
'data': iscsi_properties
|
|
}
|
|
|
|
def validate_connector(self, connector):
|
|
# iSCSI drivers require the initiator information
|
|
if 'initiator' not in connector:
|
|
err_msg = (_('The volume driver requires the iSCSI initiator '
|
|
'name in the connector.'))
|
|
LOG.error(err_msg)
|
|
raise exception.VolumeBackendAPIException(data=err_msg)
|
|
|
|
def terminate_connection(self, volume, connector, **kwargs):
|
|
pass
|
|
|
|
def _get_iscsi_initiator(self):
|
|
"""Get iscsi initiator name for this machine."""
|
|
# NOTE openiscsi stores initiator name in a file that
|
|
# needs root permission to read.
|
|
contents = utils.read_file_as_root('/etc/iscsi/initiatorname.iscsi')
|
|
for l in contents.split('\n'):
|
|
if l.startswith('InitiatorName='):
|
|
return l[l.index('=') + 1:].strip()
|
|
|
|
def get_volume_stats(self, refresh=False):
|
|
"""Get volume stats.
|
|
|
|
If 'refresh' is True, run update the stats first.
|
|
"""
|
|
if refresh:
|
|
self._update_volume_stats()
|
|
|
|
return self._stats
|
|
|
|
def _update_volume_stats(self):
|
|
"""Retrieve stats info from volume group."""
|
|
|
|
LOG.debug(_("Updating volume stats"))
|
|
data = {}
|
|
backend_name = self.configuration.safe_get('volume_backend_name')
|
|
data["volume_backend_name"] = backend_name or 'Generic_iSCSI'
|
|
data["vendor_name"] = 'Open Source'
|
|
data["driver_version"] = '1.0'
|
|
data["storage_protocol"] = 'iSCSI'
|
|
|
|
data['total_capacity_gb'] = 'infinite'
|
|
data['free_capacity_gb'] = 'infinite'
|
|
data['reserved_percentage'] = 100
|
|
data['QoS_support'] = False
|
|
self._stats = data
|
|
|
|
def get_target_admin(self):
|
|
root_helper = utils.get_root_helper()
|
|
if CONF.iscsi_helper == 'iseradm':
|
|
return iscsi.ISERTgtAdm(root_helper, CONF.volumes_dir,
|
|
CONF.iscsi_target_prefix)
|
|
elif CONF.iscsi_helper == 'tgtadm':
|
|
return iscsi.TgtAdm(root_helper,
|
|
CONF.volumes_dir,
|
|
CONF.iscsi_target_prefix)
|
|
elif CONF.iscsi_helper == 'fake':
|
|
return iscsi.FakeIscsiHelper()
|
|
elif CONF.iscsi_helper == 'lioadm':
|
|
return iscsi.LioAdm(root_helper,
|
|
CONF.lio_initiator_iqns,
|
|
CONF.iscsi_target_prefix)
|
|
else:
|
|
return iscsi.IetAdm(root_helper, CONF.iet_conf, CONF.iscsi_iotype)
|
|
|
|
|
|
class FakeISCSIDriver(ISCSIDriver):
|
|
"""Logs calls instead of executing."""
|
|
def __init__(self, *args, **kwargs):
|
|
super(FakeISCSIDriver, self).__init__(execute=self.fake_execute,
|
|
*args, **kwargs)
|
|
|
|
def create_volume(self, volume):
|
|
pass
|
|
|
|
def check_for_setup_error(self):
|
|
"""No setup necessary in fake mode."""
|
|
pass
|
|
|
|
def initialize_connection(self, volume, connector):
|
|
return {
|
|
'driver_volume_type': 'iscsi',
|
|
'data': {'access_mode': 'rw'}
|
|
}
|
|
|
|
def terminate_connection(self, volume, connector, **kwargs):
|
|
pass
|
|
|
|
@staticmethod
|
|
def fake_execute(cmd, *_args, **_kwargs):
|
|
"""Execute that simply logs the command."""
|
|
LOG.debug(_("FAKE ISCSI: %s"), cmd)
|
|
return (None, None)
|
|
|
|
|
|
class ISERDriver(ISCSIDriver):
|
|
"""Executes commands relating to ISER volumes.
|
|
|
|
We make use of model provider properties as follows:
|
|
|
|
``provider_location``
|
|
if present, contains the iSER target information in the same
|
|
format as an ietadm discovery
|
|
i.e. '<ip>:<port>,<portal> <target IQN>'
|
|
|
|
``provider_auth``
|
|
if present, contains a space-separated triple:
|
|
'<auth method> <auth username> <auth password>'.
|
|
`CHAP` is the only auth_method in use at the moment.
|
|
"""
|
|
def __init__(self, *args, **kwargs):
|
|
super(ISERDriver, self).__init__(*args, **kwargs)
|
|
# for backward compatibility
|
|
self.configuration.num_iscsi_scan_tries = \
|
|
self.configuration.num_iser_scan_tries
|
|
self.configuration.iscsi_num_targets = \
|
|
self.configuration.iser_num_targets
|
|
self.configuration.iscsi_target_prefix = \
|
|
self.configuration.iser_target_prefix
|
|
self.configuration.iscsi_ip_address = \
|
|
self.configuration.iser_ip_address
|
|
self.configuration.iser_port = self.configuration.iser_port
|
|
|
|
def initialize_connection(self, volume, connector):
|
|
"""Initializes the connection and returns connection info.
|
|
|
|
The iser driver returns a driver_volume_type of 'iser'.
|
|
The format of the driver data is defined in _get_iser_properties.
|
|
Example return value::
|
|
|
|
{
|
|
'driver_volume_type': 'iser'
|
|
'data': {
|
|
'target_discovered': True,
|
|
'target_iqn':
|
|
'iqn.2010-10.org.iser.openstack:volume-00000001',
|
|
'target_portal': '127.0.0.0.1:3260',
|
|
'volume_id': 1,
|
|
}
|
|
}
|
|
|
|
"""
|
|
|
|
iser_properties = self._get_iscsi_properties(volume)
|
|
return {
|
|
'driver_volume_type': 'iser',
|
|
'data': iser_properties
|
|
}
|
|
|
|
def _update_volume_stats(self):
|
|
"""Retrieve stats info from volume group."""
|
|
|
|
LOG.debug(_("Updating volume stats"))
|
|
data = {}
|
|
backend_name = self.configuration.safe_get('volume_backend_name')
|
|
data["volume_backend_name"] = backend_name or 'Generic_iSER'
|
|
data["vendor_name"] = 'Open Source'
|
|
data["driver_version"] = '1.0'
|
|
data["storage_protocol"] = 'iSER'
|
|
|
|
data['total_capacity_gb'] = 'infinite'
|
|
data['free_capacity_gb'] = 'infinite'
|
|
data['reserved_percentage'] = 100
|
|
data['QoS_support'] = False
|
|
self._stats = data
|
|
|
|
def get_target_admin(self):
|
|
root_helper = utils.get_root_helper()
|
|
|
|
if CONF.iser_helper == 'fake':
|
|
return iscsi.FakeIscsiHelper()
|
|
else:
|
|
return iscsi.ISERTgtAdm(root_helper,
|
|
CONF.volumes_dir)
|
|
|
|
|
|
class FakeISERDriver(FakeISCSIDriver):
|
|
"""Logs calls instead of executing."""
|
|
def __init__(self, *args, **kwargs):
|
|
super(FakeISERDriver, self).__init__(execute=self.fake_execute,
|
|
*args, **kwargs)
|
|
|
|
def initialize_connection(self, volume, connector):
|
|
return {
|
|
'driver_volume_type': 'iser',
|
|
'data': {}
|
|
}
|
|
|
|
@staticmethod
|
|
def fake_execute(cmd, *_args, **_kwargs):
|
|
"""Execute that simply logs the command."""
|
|
LOG.debug(_("FAKE ISER: %s"), cmd)
|
|
return (None, None)
|
|
|
|
|
|
class FibreChannelDriver(VolumeDriver):
|
|
"""Executes commands relating to Fibre Channel volumes."""
|
|
def __init__(self, *args, **kwargs):
|
|
super(FibreChannelDriver, self).__init__(*args, **kwargs)
|
|
|
|
def initialize_connection(self, volume, connector):
|
|
"""Initializes the connection and returns connection info.
|
|
|
|
The driver returns a driver_volume_type of 'fibre_channel'.
|
|
The target_wwn can be a single entry or a list of wwns that
|
|
correspond to the list of remote wwn(s) that will export the volume.
|
|
Example return values:
|
|
|
|
{
|
|
'driver_volume_type': 'fibre_channel'
|
|
'data': {
|
|
'target_discovered': True,
|
|
'target_lun': 1,
|
|
'target_wwn': '1234567890123',
|
|
'access_mode': 'rw'
|
|
}
|
|
}
|
|
|
|
or
|
|
|
|
{
|
|
'driver_volume_type': 'fibre_channel'
|
|
'data': {
|
|
'target_discovered': True,
|
|
'target_lun': 1,
|
|
'target_wwn': ['1234567890123', '0987654321321'],
|
|
'access_mode': 'rw'
|
|
}
|
|
}
|
|
|
|
"""
|
|
msg = _("Driver must implement initialize_connection")
|
|
raise NotImplementedError(msg)
|