224 lines
8.3 KiB
Python
224 lines
8.3 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 cinder import context
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from cinder.db.sqlalchemy import api
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from cinder import exception
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from cinder.i18n import _
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from cinder.image import image_utils
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from cinder.openstack.common import log as logging
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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.ISCSIDriver):
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VERSION = '1.0.0'
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def __init__(self, *args, **kwargs):
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self.target_helper = self.get_target_helper(kwargs.get('db'))
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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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def set_execute(self, execute):
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super(BlockDeviceDriver, self).set_execute(execute)
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if self.target_helper is not None:
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self.target_helper.set_execute(execute)
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def check_for_setup_error(self):
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pass
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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("Create %s on %s" % (volume['name'], device))
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return {
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'provider_location': device,
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}
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def initialize_connection(self, volume, connector):
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if connector['host'] != volume['host']:
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return super(BlockDeviceDriver, self). \
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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 terminate_connection(self, volume, connector, **kwargs):
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pass
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def create_export(self, context, volume):
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"""Creates an export for a logical volume."""
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volume_path = self.local_path(volume)
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data = self.target_helper.create_export(context,
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volume,
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volume_path,
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self.configuration)
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return {
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'provider_location': data['location'] + ' ' + volume_path,
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'provider_auth': data['auth'],
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}
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def remove_export(self, context, volume):
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self.target_helper.remove_export(context, volume)
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def ensure_export(self, context, volume):
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volume_name = volume['name']
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iscsi_name = "%s%s" % (self.configuration.iscsi_target_prefix,
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volume_name)
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volume_path = self.local_path(volume)
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# NOTE(jdg): For TgtAdm case iscsi_name is the ONLY param we need
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# should clean this all up at some point in the future
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self.target_helper.ensure_export(context, volume, iscsi_name,
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volume_path)
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def delete_volume(self, volume):
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"""Deletes a logical volume."""
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dev_path = self.local_path(volume)
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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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volutils.clear_volume(
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self._get_device_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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def local_path(self, volume):
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if volume['provider_location']:
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path = volume['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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def create_cloned_volume(self, volume, src_vref):
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LOG.info(_('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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volutils.copy_volume(
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self.local_path(src_vref), device,
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self._get_device_size(device) * 2048,
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self.configuration.volume_dd_blocksize,
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execute=self._execute)
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return {
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'provider_location': device,
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}
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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.iteritems():
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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 / 1024,
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'free_capacity_gb': free_size / 1024,
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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_devices(self):
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lst = api.volume_get_all_by_host(context.get_admin_context(),
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self.host)
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used_devices = set()
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for volume in lst:
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local_path = self.local_path(volume)
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if local_path:
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used_devices.add(local_path)
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return used_devices
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def _get_device_size(self, dev_path):
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out, err = self._execute('blockdev', '--getsz', dev_path,
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run_as_root=True)
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size_in_m = int(out)
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return size_in_m / 2048
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def _devices_sizes(self):
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available_devices = self.configuration.available_devices
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dict_of_devices_sizes = {}
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for device in available_devices:
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dict_of_devices_sizes[device] = self._get_device_size(device)
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return dict_of_devices_sizes
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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 * 1024 <= dev_size and (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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