5cbec4cd77
This patch adds the create_snapshot, create_volume_from_snapshot and delete_snapshot methods to Block Device driver. Related blueprint: block-device-driver-minimum-features-set Change-Id: If86dca417234ea2c58fbce4e30a1626b288de3f6
303 lines
12 KiB
Python
303 lines
12 KiB
Python
# Copyright (c) 2013 Mirantis, Inc.
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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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import os
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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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from cinder import context
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from cinder import exception
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from cinder.i18n import _, _LI, _LW
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from cinder.image import image_utils
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from cinder import objects
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from cinder import utils
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from cinder.volume import driver
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from cinder.volume import utils as volutils
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LOG = logging.getLogger(__name__)
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volume_opts = [
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cfg.ListOpt('available_devices',
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default=[],
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help='List of all available devices'),
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]
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CONF = cfg.CONF
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CONF.register_opts(volume_opts)
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class BlockDeviceDriver(driver.BaseVD, driver.LocalVD,
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driver.CloneableImageVD, driver.TransferVD):
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VERSION = '2.2.0'
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def __init__(self, *args, **kwargs):
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super(BlockDeviceDriver, self).__init__(*args, **kwargs)
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self.configuration.append_config_values(volume_opts)
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self.backend_name = \
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self.configuration.safe_get('volume_backend_name') or "BlockDev"
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target_driver =\
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self.target_mapping[self.configuration.safe_get('iscsi_helper')]
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self.target_driver = importutils.import_object(
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target_driver,
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configuration=self.configuration,
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db=self.db,
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executor=self._execute)
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def check_for_setup_error(self):
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pass
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def _update_provider_location(self, object, device):
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# We update provider_location and host to mark device as used to
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# avoid race with other threads.
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# TODO(ynesenenko): need to remove DB access from driver
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object.update({'provider_location': device, 'host': self.host})
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object.save()
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@utils.synchronized('block_device', external=True)
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def create_volume(self, volume):
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device = self.find_appropriate_size_device(volume.size)
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LOG.info(_LI("Creating %(volume)s on %(device)s"),
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{"volume": volume.name, "device": device})
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self._update_provider_location(volume, device)
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def delete_volume(self, volume):
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"""Deletes a logical volume."""
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self._clear_block_device(volume)
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def _clear_block_device(self, device):
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"""Deletes a block device."""
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dev_path = self.local_path(device)
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if not dev_path or dev_path not in \
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self.configuration.available_devices:
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return
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if os.path.exists(dev_path) and \
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self.configuration.volume_clear != 'none':
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dev_size = self._get_devices_sizes([dev_path])
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volutils.clear_volume(
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dev_size[dev_path], dev_path,
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volume_clear=self.configuration.volume_clear,
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volume_clear_size=self.configuration.volume_clear_size)
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else:
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LOG.warning(_LW("The device %s won't be cleared."), device)
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if device.status == "error_deleting":
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msg = _("Failed to delete device.")
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LOG.error(msg, resource=device)
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raise exception.VolumeDriverException(msg)
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def local_path(self, device):
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if device.provider_location:
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path = device.provider_location.rsplit(" ", 1)
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return path[-1]
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else:
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return None
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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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image_utils.fetch_to_raw(context,
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image_service,
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image_id,
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self.local_path(volume),
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self.configuration.volume_dd_blocksize,
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size=volume.size)
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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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image_utils.upload_volume(context,
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image_service,
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image_meta,
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self.local_path(volume))
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@utils.synchronized('block_device', external=True)
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def create_cloned_volume(self, volume, src_vref):
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LOG.info(_LI('Creating clone of volume: %s.'), src_vref.id)
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device = self.find_appropriate_size_device(src_vref.size)
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dev_size = self._get_devices_sizes([device])
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volutils.copy_volume(
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self.local_path(src_vref), device,
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dev_size[device],
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self.configuration.volume_dd_blocksize,
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execute=self._execute)
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self._update_provider_location(volume, device)
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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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"""Retrieve stats info from volume group."""
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dict_of_devices_sizes = self._devices_sizes()
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used_devices = self._get_used_devices()
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total_size = 0
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free_size = 0
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for device, size in dict_of_devices_sizes.items():
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if device not in used_devices:
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free_size += size
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total_size += size
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LOG.debug("Updating volume stats.")
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backend_name = self.configuration.safe_get('volume_backend_name')
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data = {'total_capacity_gb': total_size / units.Ki,
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'free_capacity_gb': free_size / units.Ki,
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'reserved_percentage': self.configuration.reserved_percentage,
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'QoS_support': False,
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'volume_backend_name': backend_name or self.__class__.__name__,
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'vendor_name': "Open Source",
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'driver_version': self.VERSION,
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'storage_protocol': 'unknown'}
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self._stats = data
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def _get_used_paths(self, lst):
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used_dev = set()
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for item in lst:
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local_path = self.local_path(item)
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if local_path:
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used_dev.add(local_path)
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return used_dev
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def _get_used_devices(self):
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lst = objects.VolumeList.get_all_by_host(context.get_admin_context(),
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self.host)
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used_devices = self._get_used_paths(lst)
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snp_lst = objects.SnapshotList.get_by_host(context.get_admin_context(),
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self.host)
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return used_devices.union(self._get_used_paths(snp_lst))
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def _get_devices_sizes(self, dev_paths):
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"""Return devices' sizes in Mb"""
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out, _err = self._execute('blockdev', '--getsize64', *dev_paths,
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run_as_root=True)
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dev_sizes = {}
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out = out.split('\n')
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# blockdev returns devices' sizes in order that
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# they have been passed to it.
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for n, size in enumerate(out[:-1]):
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dev_sizes[dev_paths[n]] = int(size) / units.Mi
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return dev_sizes
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def _devices_sizes(self):
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available_devices = self.configuration.available_devices
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return self._get_devices_sizes(available_devices)
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def find_appropriate_size_device(self, size):
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dict_of_devices_sizes = self._devices_sizes()
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free_devices = (set(self.configuration.available_devices) -
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self._get_used_devices())
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if not free_devices:
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raise exception.CinderException(_("No free disk"))
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possible_device = None
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possible_device_size = None
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for device in free_devices:
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dev_size = dict_of_devices_sizes[device]
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if (size * units.Ki <= dev_size and
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(possible_device is None or
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dev_size < possible_device_size)):
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possible_device = device
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possible_device_size = dev_size
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if possible_device:
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return possible_device
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else:
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raise exception.CinderException(_("No big enough free disk"))
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def extend_volume(self, volume, new_size):
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dev_path = self.local_path(volume)
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total_size = self._get_devices_sizes([dev_path])
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# Convert from Megabytes to Gigabytes
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size = total_size[dev_path] / units.Ki
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if size < new_size:
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msg = _("Insufficient free space available to extend volume.")
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LOG.error(msg, resource=volume)
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raise exception.CinderException(msg)
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@utils.synchronized('block_device', external=True)
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def create_snapshot(self, snapshot):
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volume = snapshot.volume
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if volume.status != 'available':
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msg = _("Volume is not available.")
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LOG.error(msg, resource=volume)
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raise exception.CinderException(msg)
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LOG.info(_LI('Creating volume snapshot: %s.'), snapshot.id)
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device = self.find_appropriate_size_device(snapshot.volume_size)
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dev_size = self._get_devices_sizes([device])
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volutils.copy_volume(
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self.local_path(volume), device,
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dev_size[device],
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self.configuration.volume_dd_blocksize,
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execute=self._execute)
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self._update_provider_location(snapshot, device)
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def delete_snapshot(self, snapshot):
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self._clear_block_device(snapshot)
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@utils.synchronized('block_device', external=True)
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def create_volume_from_snapshot(self, volume, snapshot):
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LOG.info(_LI('Creating volume %s from snapshot.'), volume.id)
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device = self.find_appropriate_size_device(snapshot.volume_size)
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dev_size = self._get_devices_sizes([device])
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volutils.copy_volume(
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self.local_path(snapshot), device,
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dev_size[device],
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self.configuration.volume_dd_blocksize,
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execute=self._execute)
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self._update_provider_location(volume, device)
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# ####### Interface methods for DataPath (Target Driver) ########
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def ensure_export(self, context, volume):
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volume_path = self.local_path(volume)
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model_update = \
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self.target_driver.ensure_export(
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context,
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volume,
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volume_path)
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return model_update
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def create_export(self, context, volume, connector):
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volume_path = self.local_path(volume)
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export_info = self.target_driver.create_export(context,
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volume,
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volume_path)
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return {
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'provider_location': export_info['location'] + ' ' + volume_path,
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'provider_auth': export_info['auth'],
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}
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def remove_export(self, context, volume):
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self.target_driver.remove_export(context, volume)
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def initialize_connection(self, volume, connector):
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if connector['host'] != volutils.extract_host(volume.host, 'host'):
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return self.target_driver.initialize_connection(volume, connector)
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else:
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return {
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'driver_volume_type': 'local',
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'data': {'device_path': self.local_path(volume)},
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}
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def validate_connector(self, connector):
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return self.target_driver.validate_connector(connector)
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def terminate_connection(self, volume, connector, **kwargs):
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pass
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