456 lines
17 KiB
Python
456 lines
17 KiB
Python
# Copyright (c) 2014, 2015 StorPool
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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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"""StorPool block device driver"""
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from __future__ import absolute_import
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from oslo_config import cfg
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from oslo_log import log as logging
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from oslo_utils import importutils
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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
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from cinder.volume import driver
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from cinder.volume import volume_types
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LOG = logging.getLogger(__name__)
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storpool = importutils.try_import('storpool')
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if storpool:
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from storpool import spapi
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from storpool import spconfig
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from storpool import spopenstack
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from storpool import sptypes
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storpool_opts = [
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cfg.StrOpt('storpool_template',
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default=None,
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help='The StorPool template for volumes with no type.'),
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cfg.IntOpt('storpool_replication',
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default=3,
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help='The default StorPool chain replication value. '
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'Used when creating a volume with no specified type if '
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'storpool_template is not set. Also used for calculating '
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'the apparent free space reported in the stats.'),
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]
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CONF = cfg.CONF
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CONF.register_opts(storpool_opts)
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class StorPoolDriver(driver.TransferVD, driver.ExtendVD, driver.CloneableVD,
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driver.SnapshotVD, driver.RetypeVD, driver.BaseVD):
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"""The StorPool block device driver.
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Version history:
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0.1.0 - Initial driver
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0.2.0 - Bring the driver up to date with Kilo and Liberty:
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- implement volume retyping and migrations
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- use the driver.*VD ABC metaclasses
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- bugfix: fall back to the configured StorPool template
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1.0.0 - Imported into OpenStack Liberty with minor fixes
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"""
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VERSION = '1.0.0'
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def __init__(self, *args, **kwargs):
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super(StorPoolDriver, self).__init__(*args, **kwargs)
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self.configuration.append_config_values(storpool_opts)
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self._sp_config = None
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self._ourId = None
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self._ourIdInt = None
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self._attach = None
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def _backendException(self, e):
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return exception.VolumeBackendAPIException(data=six.text_type(e))
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def _template_from_volume_type(self, vtype):
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specs = volume_types.get_volume_type_extra_specs(vtype['id'])
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if specs is None:
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return None
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return specs.get('storpool_template', None)
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def create_volume(self, volume):
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size = int(volume['size']) * units.Gi
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name = self._attach.volumeName(volume['id'])
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template = None
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if volume['volume_type'] is not None:
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template = self._template_from_volume_type(volume['volume_type'])
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if template is None:
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template = self.configuration.storpool_template
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try:
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if template is None:
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self._attach.api().volumeCreate({
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'name': name,
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'size': size,
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'replication': self.configuration.storpool_replication
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})
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else:
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self._attach.api().volumeCreate({
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'name': name,
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'size': size,
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'template': template
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})
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except spapi.ApiError as e:
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raise self._backendException(e)
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def _storpool_client_id(self, connector):
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hostname = connector['host']
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try:
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cfg = spconfig.SPConfig(section=hostname)
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return int(cfg['SP_OURID'])
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except KeyError:
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raise exception.StorPoolConfigurationMissing(
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section=hostname, param='SP_OURID')
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except Exception as e:
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raise exception.StorPoolConfigurationInvalid(
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section=hostname, param='SP_OURID', error=e)
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def validate_connector(self, connector):
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return self._storpool_client_id(connector) >= 0
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def initialize_connection(self, volume, connector):
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return {'driver_volume_type': 'storpool',
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'data': {
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'client_id': self._storpool_client_id(connector),
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'volume': volume['id'],
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}}
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def terminate_connection(self, volume, connector, **kwargs):
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pass
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def create_snapshot(self, snapshot):
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volname = self._attach.volumeName(snapshot['volume_id'])
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name = self._attach.snapshotName('snap', snapshot['id'])
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try:
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self._attach.api().snapshotCreate(volname, {'name': name})
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except spapi.ApiError as e:
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raise self._backendException(e)
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def create_volume_from_snapshot(self, volume, snapshot):
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size = int(volume['size']) * units.Gi
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volname = self._attach.volumeName(volume['id'])
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name = self._attach.snapshotName('snap', snapshot['id'])
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try:
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self._attach.api().volumeCreate({
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'name': volname,
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'size': size,
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'parent': name
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})
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except spapi.ApiError as e:
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raise self._backendException(e)
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def create_cloned_volume(self, volume, src_vref):
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refname = self._attach.volumeName(src_vref['id'])
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snapname = self._attach.snapshotName('clone', volume['id'])
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try:
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self._attach.api().snapshotCreate(refname, {'name': snapname})
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except spapi.ApiError as e:
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raise self._backendException(e)
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size = int(volume['size']) * units.Gi
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volname = self._attach.volumeName(volume['id'])
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try:
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self._attach.api().volumeCreate({
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'name': volname,
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'size': size,
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'parent': snapname
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})
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except spapi.ApiError as e:
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raise self._backendException(e)
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finally:
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try:
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self._attach.api().snapshotDelete(snapname)
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except spapi.ApiError as e:
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# ARGH!
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LOG.error(_LE("Could not delete the temp snapshot {n}: {msg}").
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format(n=snapname, msg=six.text_type(e)))
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def create_export(self, context, volume):
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pass
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def remove_export(self, context, volume):
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pass
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def delete_volume(self, volume):
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name = self._attach.volumeName(volume['id'])
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try:
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self._attach.api().volumesReassign(
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json=[{"volume": name, "detach": "all"}])
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self._attach.api().volumeDelete(name)
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except spapi.ApiError as e:
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if e.name == 'objectDoesNotExist':
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pass
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else:
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raise self._backendException(e)
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def delete_snapshot(self, snapshot):
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name = self._attach.snapshotName('snap', snapshot['id'])
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try:
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self._attach.api().volumesReassign(
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json=[{"snapshot": name, "detach": "all"}])
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self._attach.api().snapshotDelete(name)
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except spapi.ApiError as e:
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if e.name == 'objectDoesNotExist':
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pass
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else:
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raise self._backendException(e)
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def check_for_setup_error(self):
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if storpool is None:
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msg = _('storpool libraries not found')
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raise exception.VolumeBackendAPIException(data=msg)
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self._attach = spopenstack.AttachDB(log=LOG)
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try:
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self._attach.api()
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except Exception as e:
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LOG.error(_LE("StorPoolDriver API initialization failed: {e}").
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format(e=e))
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raise
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def get_volume_stats(self, refresh=False):
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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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try:
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dl = self._attach.api().disksList()
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templates = self._attach.api().volumeTemplatesList()
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except spapi.ApiError as e:
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raise self._backendException(e)
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total = 0
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used = 0
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free = 0
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agSize = 512 * units.Mi
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for (id, desc) in dl.items():
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if desc.generationLeft != -1:
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continue
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total += desc.agCount * agSize
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used += desc.agAllocated * agSize
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free += desc.agFree * agSize * 4096 / (4096 + 128)
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# Report the free space as if all new volumes will be created
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# with StorPool replication 3; anything else is rare.
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free /= self.configuration.storpool_replication
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space = {
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'total_capacity_gb': total / units.Gi,
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'free_capacity_gb': free / units.Gi,
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'reserved_percentage': 0,
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'QoS_support': False,
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}
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pools = [dict(space, pool_name='default')]
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pools += [dict(space,
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pool_name='template_' + t.name,
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storpool_template=t.name
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) for t in templates]
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self._stats = {
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'volume_backend_name': self.configuration.safe_get(
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'volume_backend_name') or 'storpool',
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'vendor_name': 'StorPool',
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'driver_version': self.VERSION,
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'storage_protocol': 'storpool',
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'pools': pools
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}
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def _attach_volume(self, context, volume, properties, remote=False):
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if remote:
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return super(StorPoolDriver, self)._attach_volume(
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context, volume, properties, remote=remote)
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req_id = context.request_id
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req = self._attach.get().get(req_id, None)
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if req is None:
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req = {
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'volume': self._attach.volumeName(volume['id']),
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'type': 'cinder-attach',
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'id': context.request_id,
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'rights': 2,
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'volsnap': False,
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'remove_on_detach': True
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}
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self._attach.add(req_id, req)
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name = req['volume']
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self._attach.sync(req_id, None)
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return {'device': {'path': '/dev/storpool/{v}'.format(v=name),
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'storpool_attach_req': req_id}}, volume
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def _detach_volume(self, context, attach_info, volume, properties,
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force=False, remote=False):
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if remote:
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return super(StorPoolDriver, self)._detach_volume(
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context, attach_info, volume, properties,
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force=force, remote=remote)
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req_id = attach_info.get('device', {}).get(
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'storpool_attach_req', context.request_id)
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req = self._attach.get()[req_id]
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name = req['volume']
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self._attach.sync(req_id, name)
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if req.get('remove_on_detach', False):
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self._attach.remove(req_id)
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def backup_volume(self, context, backup, backup_service):
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volume = self.db.volume_get(context, backup['volume_id'])
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req_id = context.request_id
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volname = self._attach.volumeName(volume['id'])
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name = self._attach.volsnapName(volume['id'], req_id)
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try:
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self._attach.api().snapshotCreate(volname, {'name': name})
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except spapi.ApiError as e:
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raise self._backendException(e)
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self._attach.add(req_id, {
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'volume': name,
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'type': 'backup',
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'id': req_id,
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'rights': 1,
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'volsnap': True
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})
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try:
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return super(StorPoolDriver, self).backup_volume(
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context, backup, backup_service)
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finally:
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self._attach.remove(req_id)
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try:
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self._attach.api().snapshotDelete(name)
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except spapi.ApiError as e:
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LOG.error(
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_LE('Could not remove the temp snapshot {n} for {v}: {e}').
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format(n=name, v=volname, e=six.text_type(e)))
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def copy_volume_to_image(self, context, volume, image_service, image_meta):
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req_id = context.request_id
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volname = self._attach.volumeName(volume['id'])
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name = self._attach.volsnapName(volume['id'], req_id)
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try:
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self._attach.api().snapshotCreate(volname, {'name': name})
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except spapi.ApiError as e:
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raise self._backendException(e)
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self._attach.add(req_id, {
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'volume': name,
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'type': 'copy-from',
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'id': req_id,
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'rights': 1,
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'volsnap': True
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})
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try:
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return super(StorPoolDriver, self).copy_volume_to_image(
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context, volume, image_service, image_meta)
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finally:
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self._attach.remove(req_id)
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try:
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self._attach.api().snapshotDelete(name)
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except spapi.ApiError as e:
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LOG.error(
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_LE('Could not remove the temp snapshot {n} for {v}: {e}').
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format(n=name, v=volname, e=six.text_type(e)))
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def copy_image_to_volume(self, context, volume, image_service, image_id):
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req_id = context.request_id
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name = self._attach.volumeName(volume['id'])
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self._attach.add(req_id, {
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'volume': name,
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'type': 'copy-to',
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'id': req_id,
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'rights': 2
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})
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try:
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return super(StorPoolDriver, self).copy_image_to_volume(
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context, volume, image_service, image_id)
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finally:
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self._attach.remove(req_id)
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def extend_volume(self, volume, new_size):
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size = int(new_size) * units.Gi
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name = self._attach.volumeName(volume['id'])
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try:
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upd = sptypes.VolumeUpdateDesc(size=size)
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self._attach.api().volumeUpdate(name, upd)
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except spapi.ApiError as e:
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raise self._backendException(e)
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def ensure_export(self, context, volume):
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# Already handled by Nova's AttachDB, we hope.
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# Maybe it should move here, but oh well.
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pass
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def retype(self, context, volume, new_type, diff, host):
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update = {}
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if diff['encryption']:
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LOG.error(_LE('Retype of encryption type not supported.'))
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return False
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templ = self.configuration.storpool_template
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repl = self.configuration.storpool_replication
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if diff['extra_specs']:
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for (k, v) in diff['extra_specs'].items():
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if k == 'volume_backend_name':
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if v[0] != v[1]:
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# Retype of a volume backend not supported yet,
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# the volume needs to be migrated.
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return False
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elif k == 'storpool_template':
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if v[0] != v[1]:
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if v[1] is not None:
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update['template'] = v[1]
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elif templ is not None:
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update['template'] = templ
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else:
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update['replication'] = repl
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elif v[0] != v[1]:
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LOG.error(_LE('Retype of extra_specs "%s" not '
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'supported yet.'), k)
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return False
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if update:
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name = self._attach.volumeName(volume['id'])
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try:
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upd = sptypes.VolumeUpdateDesc(**update)
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self._attach.api().volumeUpdate(name, upd)
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except spapi.ApiError as e:
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raise self._backendException(e)
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return True
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def update_migrated_volume(self, context, volume, new_volume):
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orig_id = volume['id']
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orig_name = self._attach.volumeName(orig_id)
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temp_id = new_volume['id']
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temp_name = self._attach.volumeName(temp_id)
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vols = {v.name: True for v in self._attach.api().volumesList()}
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if temp_name not in vols:
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LOG.error(_LE('StorPool update_migrated_volume(): it seems '
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'that the StorPool volume "%(tid)" was not '
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'created as part of the migration from '
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'"%(oid)"'), {'tid': temp_id, 'oid': orig_id})
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elif orig_name in vols:
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LOG.error(_LE('StorPool update_migrated_volume(): both '
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'the original volume "%(oid)" and the migrated '
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'StorPool volume "%(tid)" seem to exist on '
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'the StorPool cluster'),
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{'oid': orig_id, 'tid': temp_id})
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else:
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self._attach.api().volumeUpdate(temp_name, {'rename': orig_name})
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