OpenStack Block Storage (Cinder)
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# Copyright (C) 2012 Hewlett-Packard Development Company, L.P.
# Copyright (c) 2014 TrilioData, Inc
# Copyright (c) 2015 EMC Corporation
# All Rights Reserved.
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
Handles all requests relating to the volume backups service.
from datetime import datetime
from eventlet import greenthread
from oslo_config import cfg
from oslo_log import log as logging
from oslo_utils import excutils
from oslo_utils import strutils
from pytz import timezone
import random
from cinder.backup import rpcapi as backup_rpcapi
from cinder.common import constants
from cinder import context
from cinder.db import base
from cinder import exception
from cinder.i18n import _
from cinder import objects
from cinder.objects import fields
from cinder.policies import backup_actions as backup_action_policy
from cinder.policies import backups as policy
import cinder.policy
from cinder import quota
from cinder import quota_utils
import cinder.volume
from cinder.volume import volume_utils
backup_opts = [
help='Backup services use same backend.')
LOG = logging.getLogger(__name__)
IMPORT_VOLUME_ID = '00000000-0000-0000-0000-000000000000'
class API(base.Base):
"""API for interacting with the volume backup manager."""
def __init__(self, db=None):
self.backup_rpcapi = backup_rpcapi.BackupAPI()
self.volume_api = cinder.volume.API()
super(API, self).__init__(db)
def get(self, context, backup_id):
backup = objects.Backup.get_by_id(context, backup_id)
context.authorize(policy.GET_POLICY, target_obj=backup)
return backup
def _check_support_to_force_delete(self, context, backup_host):
result = self.backup_rpcapi.check_support_to_force_delete(context,
return result
def delete(self, context, backup, force=False):
"""Make the RPC call to delete a volume backup.
Call backup manager to execute backup delete or force delete operation.
:param context: running context
:param backup: the dict of backup that is got from DB.
:param force: indicate force delete or not
:raises InvalidBackup:
:raises BackupDriverException:
:raises ServiceNotFound:
context.authorize(policy.DELETE_POLICY, target_obj=backup)
if not force and backup.status not in [fields.BackupStatus.AVAILABLE,
msg = _('Backup status must be available or error')
raise exception.InvalidBackup(reason=msg)
if force and not self._check_support_to_force_delete(context,
msg = _('force delete')
raise exception.NotSupportedOperation(operation=msg)
# Don't allow backup to be deleted if there are incremental
# backups dependent on it.
deltas = self.get_all(context, search_opts={'parent_id':})
if deltas and len(deltas):
msg = _('Incremental backups exist for this backup.')
raise exception.InvalidBackup(reason=msg)
backup.status = fields.BackupStatus.DELETING = self._get_available_backup_service_host(, backup.availability_zone)
self.backup_rpcapi.delete_backup(context, backup)
def get_all(self, context, search_opts=None, marker=None, limit=None,
offset=None, sort_keys=None, sort_dirs=None):
search_opts = search_opts or {}
all_tenants = search_opts.pop('all_tenants', '0')
if not strutils.is_valid_boolstr(all_tenants):
msg = _("all_tenants must be a boolean, got '%s'.") % all_tenants
raise exception.InvalidParameterValue(err=msg)
if context.is_admin and strutils.bool_from_string(all_tenants):
backups = objects.BackupList.get_all(context, search_opts,
marker, limit, offset,
sort_keys, sort_dirs)
backups = objects.BackupList.get_all_by_project(
context, context.project_id, search_opts,
marker, limit, offset, sort_keys, sort_dirs
return backups
def _az_matched(self, service, availability_zone):
return ((not availability_zone) or
service.availability_zone == availability_zone)
def _is_backup_service_enabled(self, availability_zone, host):
"""Check if there is a backup service available."""
topic = constants.BACKUP_TOPIC
ctxt = context.get_admin_context()
services = objects.ServiceList.get_all_by_topic(
ctxt, topic, disabled=False)
for srv in services:
if (self._az_matched(srv, availability_zone) and == host and srv.is_up):
return True
return False
def _get_any_available_backup_service(self, availability_zone):
"""Get an available backup service host.
Get an available backup service host in the specified
availability zone.
services = [srv for srv in self._list_backup_services()]
# Get the next running service with matching availability zone.
idx = 0
while idx < len(services):
srv = services[idx]
if(self._az_matched(srv, availability_zone) and
idx = idx + 1
return None
def get_available_backup_service_host(self, host, az):
return self._get_available_backup_service_host(host, az)
def _get_available_backup_service_host(self, host, az):
"""Return an appropriate backup service host."""
backup_host = None
if not host or not CONF.backup_use_same_host:
backup_host = self._get_any_available_backup_service(az)
elif self._is_backup_service_enabled(az, host):
backup_host = host
if not backup_host:
raise exception.ServiceNotFound(service_id='cinder-backup')
return backup_host
def _list_backup_services(self):
"""List all enabled backup services.
:returns: list -- hosts for services that are enabled for backup.
topic = constants.BACKUP_TOPIC
ctxt = context.get_admin_context()
services = objects.ServiceList.get_all_by_topic(
ctxt, topic, disabled=False)
return services
def _list_backup_hosts(self):
services = self._list_backup_services()
return [ for srv in services
if not srv.disabled and srv.is_up]
def create(self, context, name, description, volume_id,
container, incremental=False, availability_zone=None,
force=False, snapshot_id=None, metadata=None):
"""Make the RPC call to create a volume backup."""
volume = self.volume_api.get(context, volume_id)
context.authorize(policy.CREATE_POLICY, target_obj=volume)
snapshot = None
if snapshot_id:
snapshot = self.volume_api.get_snapshot(context, snapshot_id)
if volume_id != snapshot.volume_id:
msg = (_('Volume %(vol1)s does not match with '
'snapshot.volume_id %(vol2)s.')
% {'vol1': volume_id,
'vol2': snapshot.volume_id})
raise exception.InvalidVolume(reason=msg)
if snapshot['status'] not in ["available"]:
msg = (_('Snapshot to be backed up must be available, '
'but the current status is "%s".')
% snapshot['status'])
raise exception.InvalidSnapshot(reason=msg)
elif volume['status'] not in ["available", "in-use"]:
msg = (_('Volume to be backed up must be available '
'or in-use, but the current status is "%s".')
% volume['status'])
raise exception.InvalidVolume(reason=msg)
elif volume['status'] in ["in-use"] and not force:
msg = _('Backing up an in-use volume must use '
'the force flag.')
raise exception.InvalidVolume(reason=msg)
previous_status = volume['status']
volume_host = volume_utils.extract_host(, 'host')
availability_zone = availability_zone or volume.availability_zone
host = self._get_available_backup_service_host(volume_host,
# Reserve a quota before setting volume status and backup status
reserve_opts = {'backups': 1,
'backup_gigabytes': volume['size']}
reservations = QUOTAS.reserve(context, **reserve_opts)
except exception.OverQuota as e:
context, e,
# Find the latest backup and use it as the parent backup to do an
# incremental backup.
latest_backup = None
if incremental:
backups = objects.BackupList.get_all_by_volume(
context, volume_id, volume['project_id'],
filters={'project_id': context.project_id})
if backups.objects:
# NOTE(xyang): The 'data_timestamp' field records the time
# when the data on the volume was first saved. If it is
# a backup from volume, 'data_timestamp' will be the same
# as 'created_at' for a backup. If it is a backup from a
# snapshot, 'data_timestamp' will be the same as
# 'created_at' for a snapshot.
# If not backing up from snapshot, the backup with the latest
# 'data_timestamp' will be the parent; If backing up from
# snapshot, the backup with the latest 'data_timestamp' will
# be chosen only if 'data_timestamp' is earlier than the
# 'created_at' timestamp of the snapshot; Otherwise, the
# backup will not be chosen as the parent.
# For example, a volume has a backup taken at 8:00, then
# a snapshot taken at 8:10, and then a backup at 8:20.
# When taking an incremental backup of the snapshot, the
# parent should be the backup at 8:00, not 8:20, and the
# 'data_timestamp' of this new backup will be 8:10.
latest_backup = max(
key=lambda x: x['data_timestamp']
if (not snapshot or (snapshot and x['data_timestamp']
< snapshot['created_at']))
else datetime(1, 1, 1, 1, 1, 1, tzinfo=timezone('UTC')))
QUOTAS.rollback(context, reservations)
msg = _('No backups available to do an incremental backup.')
raise exception.InvalidBackup(reason=msg)
parent_id = None
parent = None
if latest_backup:
parent = latest_backup
parent_id =
if latest_backup['status'] != fields.BackupStatus.AVAILABLE:
QUOTAS.rollback(context, reservations)
msg = _('The parent backup must be available for '
'incremental backup.')
raise exception.InvalidBackup(reason=msg)
data_timestamp = None
if snapshot_id:
snapshot = objects.Snapshot.get_by_id(context, snapshot_id)
data_timestamp = snapshot.created_at
context, snapshot_id,
{'status': fields.SnapshotStatus.BACKING_UP})
self.db.volume_update(context, volume_id,
{'status': 'backing-up',
'previous_status': previous_status})
backup = None
kwargs = {
'user_id': context.user_id,
'project_id': context.project_id,
'display_name': name,
'display_description': description,
'volume_id': volume_id,
'status': fields.BackupStatus.CREATING,
'container': container,
'parent_id': parent_id,
'size': volume['size'],
'host': host,
'availability_zone': availability_zone,
'snapshot_id': snapshot_id,
'data_timestamp': data_timestamp,
'parent': parent,
'metadata': metadata or {}
backup = objects.Backup(context=context, **kwargs)
if not snapshot_id:
backup.data_timestamp = backup.created_at
QUOTAS.commit(context, reservations)
except Exception:
with excutils.save_and_reraise_exception():
if backup and 'id' in backup:
QUOTAS.rollback(context, reservations)
# TODO(DuncanT): In future, when we have a generic local attach,
# this can go via the scheduler, which enables
# better load balancing and isolation of services
self.backup_rpcapi.create_backup(context, backup)
return backup
def restore(self, context, backup_id, volume_id=None, name=None):
"""Make the RPC call to restore a volume backup."""
backup = self.get(context, backup_id)
context.authorize(policy.RESTORE_POLICY, target_obj=backup)
if backup['status'] != fields.BackupStatus.AVAILABLE:
msg = _('Backup status must be available')
raise exception.InvalidBackup(reason=msg)
size = backup['size']
if size is None:
msg = _('Backup to be restored has invalid size')
raise exception.InvalidBackup(reason=msg)
# Create a volume if none specified. If a volume is specified check
# it is large enough for the backup
if volume_id is None:
if name is None:
name = 'restore_backup_%s' % backup_id
description = 'auto-created_from_restore_from_backup'"Creating volume of %(size)s GB for restore of "
"backup %(backup_id)s.",
{'size': size, 'backup_id': backup_id})
volume = self.volume_api.create(context, size, name, description)
volume_id = volume['id']
while True:
volume = self.volume_api.get(context, volume_id)
if volume['status'] != 'creating':
if volume['status'] == "error":
msg = (_('Error while creating volume %(volume_id)s '
'for restoring backup %(backup_id)s.') %
{'volume_id': volume_id, 'backup_id': backup_id})
raise exception.InvalidVolume(reason=msg)
volume = self.volume_api.get(context, volume_id)
if volume['status'] != "available":
msg = _('Volume to be restored to must be available')
raise exception.InvalidVolume(reason=msg)
LOG.debug('Checking backup size %(bs)s against volume size %(vs)s',
{'bs': size, 'vs': volume['size']})
if size > volume['size']:
msg = (_('volume size %(volume_size)d is too small to restore '
'backup of size %(size)d.') %
{'volume_size': volume['size'], 'size': size})
raise exception.InvalidVolume(reason=msg)"Overwriting volume %(volume_id)s with restore of "
"backup %(backup_id)s",
{'volume_id': volume_id, 'backup_id': backup_id})
# Setting the status here rather than setting at start and unrolling
# for each error condition, it should be a very small window = self._get_available_backup_service_host(, backup.availability_zone)
backup.status = fields.BackupStatus.RESTORING
backup.restore_volume_id =
self.db.volume_update(context, volume_id, {'status':
self.backup_rpcapi.restore_backup(context,, backup,
d = {'backup_id': backup_id,
'volume_id': volume_id,
'volume_name': volume['display_name'], }
return d
def reset_status(self, context, backup_id, status):
"""Make the RPC call to reset a volume backup's status.
Call backup manager to execute backup status reset operation.
:param context: running context
:param backup_id: which backup's status to be reset
:param status: backup's status to be reset
:raises InvalidBackup:
# get backup info
backup = self.get(context, backup_id)
backup_action_policy.BASE_POLICY_NAME % "reset_status",
target_obj=backup) = self._get_available_backup_service_host(, backup.availability_zone)
# send to manager to do reset operation
self.backup_rpcapi.reset_status(ctxt=context, backup=backup,
def export_record(self, context, backup_id):
"""Make the RPC call to export a volume backup.
Call backup manager to execute backup export.
:param context: running context
:param backup_id: backup id to export
:returns: dictionary -- a description of how to import the backup
:returns: contains 'backup_url' and 'backup_service'
:raises InvalidBackup:
backup = self.get(context, backup_id)
context.authorize(policy.EXPORT_POLICY, target_obj=backup)
if backup['status'] != fields.BackupStatus.AVAILABLE:
msg = (_('Backup status must be available and not %s.') %
raise exception.InvalidBackup(reason=msg)
LOG.debug("Calling RPCAPI with context: "
"%(ctx)s, host: %(host)s, backup: %(id)s.",
{'ctx': context,
'host': backup['host'],
'id': backup['id']}) = self._get_available_backup_service_host(, backup.availability_zone)
export_data = self.backup_rpcapi.export_record(context, backup)
return export_data
def _get_import_backup(self, context, backup_url):
"""Prepare database backup record for import.
This method decodes provided backup_url and expects to find the id of
the backup in there.
Then checks the DB for the presence of this backup record and if it
finds it and is not deleted it will raise an exception because the
record cannot be created or used.
If the record is in deleted status then we must be trying to recover
this record, so we'll reuse it.
If the record doesn't already exist we create it with provided id.
:param context: running context
:param backup_url: backup description to be used by the backup driver
:return: BackupImport object
:raises InvalidBackup:
:raises InvalidInput:
reservations = None
backup = None
# Deserialize string backup record into a dictionary
backup_record = objects.Backup.decode_record(backup_url)
# ID is a required field since it's what links incremental backups
if 'id' not in backup_record:
msg = _('Provided backup record is missing an id')
raise exception.InvalidInput(reason=msg)
# Since we use size to reserve&commit quota, size is another required
# field.
if 'size' not in backup_record:
msg = _('Provided backup record is missing size attribute')
raise exception.InvalidInput(reason=msg)
reserve_opts = {'backups': 1,
'backup_gigabytes': backup_record['size']}
reservations = QUOTAS.reserve(context, **reserve_opts)
except exception.OverQuota as e:
context, e,
kwargs = {
'user_id': context.user_id,
'project_id': context.project_id,
'volume_id': IMPORT_VOLUME_ID,
'status': fields.BackupStatus.CREATING,
'deleted_at': None,
'deleted': False,
'metadata': {}
# Try to get the backup with that ID in all projects even among
# deleted entries.
backup = objects.BackupImport.get_by_id(
# If record exists and it's not deleted we cannot proceed
# with the import
if backup.status != fields.BackupStatus.DELETED:
msg = _('Backup already exists in database.')
raise exception.InvalidBackup(reason=msg)
# Otherwise we'll "revive" delete backup record
QUOTAS.commit(context, reservations)
except exception.BackupNotFound:
# If record doesn't exist create it with the specific ID
backup = objects.BackupImport(context=context,
id=backup_record['id'], **kwargs)
QUOTAS.commit(context, reservations)
except Exception:
with excutils.save_and_reraise_exception():
if backup and 'id' in backup:
QUOTAS.rollback(context, reservations)
return backup
def import_record(self, context, backup_service, backup_url):
"""Make the RPC call to import a volume backup.
:param context: running context
:param backup_service: backup service name
:param backup_url: backup description to be used by the backup driver
:raises InvalidBackup:
:raises ServiceNotFound:
:raises InvalidInput:
# NOTE(ronenkat): since we don't have a backup-scheduler
# we need to find a host that support the backup service
# that was used to create the backup.
# We send it to the first backup service host, and the backup manager
# on that host will forward it to other hosts on the hosts list if it
# cannot support correct service itself.
hosts = self._list_backup_hosts()
if len(hosts) == 0:
raise exception.ServiceNotFound(service_id=backup_service)
# Get Backup object that will be used to import this backup record
backup = self._get_import_backup(context, backup_url)
first_host = hosts.pop()
return backup
def update(self, context, backup_id, fields):
backup = self.get(context, backup_id)
context.authorize(policy.UPDATE_POLICY, target_obj=backup)
return backup