598 lines
24 KiB
Python
598 lines
24 KiB
Python
# Copyright (c) 2014 Cloudbase Solutions SRL
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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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import re
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from oslo.config import cfg
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from cinder.brick.remotefs import remotefs
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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.gettextutils import _
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from cinder.openstack.common import log as logging
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from cinder.openstack.common import processutils as putils
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from cinder.openstack.common import units
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from cinder import utils
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from cinder.volume.drivers import remotefs as remotefs_drv
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VERSION = '1.0.0'
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LOG = logging.getLogger(__name__)
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volume_opts = [
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cfg.StrOpt('smbfs_shares_config',
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default='/etc/cinder/smbfs_shares',
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help='File with the list of available smbfs shares.'),
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cfg.StrOpt('smbfs_default_volume_format',
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default='qcow2',
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help=('Default format that will be used when creating volumes '
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'if no volume format is specified. Can be set to: '
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'raw, qcow2, vhd or vhdx.')),
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cfg.BoolOpt('smbfs_sparsed_volumes',
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default=True,
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help=('Create volumes as sparsed files which take no space '
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'rather than regular files when using raw format, '
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'in which case volume creation takes lot of time.')),
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cfg.FloatOpt('smbfs_used_ratio',
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default=0.95,
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help=('Percent of ACTUAL usage of the underlying volume '
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'before no new volumes can be allocated to the volume '
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'destination.')),
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cfg.FloatOpt('smbfs_oversub_ratio',
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default=1.0,
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help=('This will compare the allocated to available space on '
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'the volume destination. If the ratio exceeds this '
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'number, the destination will no longer be valid.')),
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cfg.StrOpt('smbfs_mount_point_base',
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default='$state_path/mnt',
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help=('Base dir containing mount points for smbfs shares.')),
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cfg.StrOpt('smbfs_mount_options',
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default='noperm,file_mode=0775,dir_mode=0775',
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help=('Mount options passed to the smbfs client. See '
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'mount.cifs man page for details.')),
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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 SmbfsDriver(remotefs_drv.RemoteFSSnapDriver):
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"""SMBFS based cinder volume driver.
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"""
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driver_volume_type = 'smbfs'
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driver_prefix = 'smbfs'
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volume_backend_name = 'Generic_SMBFS'
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SHARE_FORMAT_REGEX = r'//.+/.+'
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VERSION = VERSION
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_DISK_FORMAT_VHD = 'vhd'
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_DISK_FORMAT_VHD_LEGACY = 'vpc'
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_DISK_FORMAT_VHDX = 'vhdx'
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_DISK_FORMAT_RAW = 'raw'
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_DISK_FORMAT_QCOW2 = 'qcow2'
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def __init__(self, execute=putils.execute, *args, **kwargs):
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self._remotefsclient = None
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super(SmbfsDriver, self).__init__(*args, **kwargs)
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self.configuration.append_config_values(volume_opts)
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root_helper = utils.get_root_helper()
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self.base = getattr(self.configuration,
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'smbfs_mount_point_base')
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opts = getattr(self.configuration,
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'smbfs_mount_options')
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self._remotefsclient = remotefs.RemoteFsClient(
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'cifs', root_helper, execute=execute,
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smbfs_mount_point_base=self.base,
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smbfs_mount_options=opts)
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self.img_suffix = None
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def _qemu_img_info(self, path, volume_name):
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return super(SmbfsDriver, self)._qemu_img_info_base(
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path, volume_name, self.configuration.smbfs_mount_point_base)
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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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:param volume: volume reference
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:param connector: connector reference
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"""
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# Find active image
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active_file = self.get_active_image_from_info(volume)
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active_file_path = os.path.join(self._local_volume_dir(volume),
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active_file)
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info = self._qemu_img_info(active_file_path, volume['name'])
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fmt = info.file_format
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data = {'export': volume['provider_location'],
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'format': fmt,
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'name': active_file}
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if volume['provider_location'] in self.shares:
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data['options'] = self.shares[volume['provider_location']]
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return {
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'driver_volume_type': self.driver_volume_type,
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'data': data,
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'mount_point_base': self._get_mount_point_base()
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}
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def do_setup(self, context):
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config = self.configuration.smbfs_shares_config
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if not config:
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msg = (_("SMBFS config file not set (smbfs_shares_config)."))
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LOG.error(msg)
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raise exception.SmbfsException(msg)
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if not os.path.exists(config):
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msg = (_("SMBFS config file at %(config)s doesn't exist.") %
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{'config': config})
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LOG.error(msg)
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raise exception.SmbfsException(msg)
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if not os.path.isabs(self.base):
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msg = _("Invalid mount point base: %s") % self.base
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LOG.error(msg)
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raise exception.SmbfsException(msg)
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if not self.configuration.smbfs_oversub_ratio > 0:
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msg = _(
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"SMBFS config 'smbfs_oversub_ratio' invalid. Must be > 0: "
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"%s") % self.configuration.smbfs_oversub_ratio
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LOG.error(msg)
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raise exception.SmbfsException(msg)
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if ((not self.configuration.smbfs_used_ratio > 0) and
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(self.configuration.smbfs_used_ratio <= 1)):
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msg = _("SMBFS config 'smbfs_used_ratio' invalid. Must be > 0 "
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"and <= 1.0: %s") % self.configuration.smbfs_used_ratio
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LOG.error(msg)
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raise exception.SmbfsException(msg)
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self.shares = {} # address : options
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self._ensure_shares_mounted()
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def local_path(self, volume):
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"""Get volume path (mounted locally fs path) for given volume.
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:param volume: volume reference
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"""
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fmt = self.get_volume_format(volume)
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local_dir = self._local_volume_dir(volume)
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local_path = os.path.join(local_dir, volume['name'])
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if fmt in (self._DISK_FORMAT_VHD, self._DISK_FORMAT_VHDX):
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local_path += '.' + fmt
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return local_path
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def _local_path_volume_info(self, volume):
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return '%s%s' % (self.local_path(volume), '.info')
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def _get_new_snap_path(self, snapshot):
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vol_path = self.local_path(snapshot['volume'])
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snap_path, ext = os.path.splitext(vol_path)
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snap_path += '.' + snapshot['id'] + ext
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return snap_path
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def get_volume_format(self, volume, qemu_format=False):
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volume_dir = self._local_volume_dir(volume)
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volume_path = os.path.join(volume_dir, volume['name'])
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if os.path.exists(volume_path):
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info = self._qemu_img_info(volume_path, volume['name'])
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volume_format = info.file_format
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else:
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volume_format = (
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self._get_volume_format_spec(volume) or
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self.configuration.smbfs_default_volume_format)
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if qemu_format and volume_format == self._DISK_FORMAT_VHD:
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volume_format = self._DISK_FORMAT_VHD_LEGACY
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elif volume_format == self._DISK_FORMAT_VHD_LEGACY:
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volume_format = self._DISK_FORMAT_VHD
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return volume_format
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@utils.synchronized('smbfs', external=False)
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def delete_volume(self, volume):
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"""Deletes a logical volume."""
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if not volume['provider_location']:
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LOG.warn(_('Volume %s does not have provider_location specified, '
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'skipping.'), volume['name'])
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return
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self._ensure_share_mounted(volume['provider_location'])
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volume_dir = self._local_volume_dir(volume)
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mounted_path = os.path.join(volume_dir,
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self.get_active_image_from_info(volume))
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if os.path.exists(mounted_path):
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self._delete(mounted_path)
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else:
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LOG.debug("Skipping deletion of volume %s as it does not exist." %
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mounted_path)
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info_path = self._local_path_volume_info(volume)
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self._delete(info_path)
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def get_qemu_version(self):
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info, _ = self._execute('qemu-img', check_exit_code=False)
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pattern = r"qemu-img version ([0-9\.]*)"
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version = re.match(pattern, info)
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if not version:
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LOG.warn(_("qemu-img is not installed."))
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return None
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return [int(x) for x in version.groups()[0].split('.')]
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def _create_windows_image(self, volume_path, volume_size, volume_format):
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"""Creates a VHD or VHDX file of a given size."""
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# vhd is regarded as vpc by qemu
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if volume_format == self._DISK_FORMAT_VHD:
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volume_format = self._DISK_FORMAT_VHD_LEGACY
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else:
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qemu_version = self.get_qemu_version()
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if qemu_version < [1, 7]:
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err_msg = _("This version of qemu-img does not support vhdx "
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"images. Please upgrade to 1.7 or greater.")
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raise exception.SmbfsException(err_msg)
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self._execute('qemu-img', 'create', '-f', volume_format,
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volume_path, str(volume_size * units.Gi),
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run_as_root=True)
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def _do_create_volume(self, volume):
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"""Create a volume on given smbfs_share.
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:param volume: volume reference
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"""
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volume_format = self.get_volume_format(volume)
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volume_path = self.local_path(volume)
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volume_size = volume['size']
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LOG.debug("Creating new volume at %s." % volume_path)
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if os.path.exists(volume_path):
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msg = _('File already exists at %s.') % volume_path
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LOG.error(msg)
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raise exception.InvalidVolume(reason=msg)
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if volume_format in (self._DISK_FORMAT_VHD, self._DISK_FORMAT_VHDX):
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self._create_windows_image(volume_path, volume_size,
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volume_format)
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else:
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self.img_suffix = None
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if volume_format == self._DISK_FORMAT_QCOW2:
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self._create_qcow2_file(volume_path, volume_size)
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elif self.configuration.smbfs_sparsed_volumes:
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self._create_sparsed_file(volume_path, volume_size)
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else:
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self._create_regular_file(volume_path, volume_size)
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self._set_rw_permissions_for_all(volume_path)
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def _get_capacity_info(self, smbfs_share):
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"""Calculate available space on the SMBFS share.
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:param smbfs_share: example //172.18.194.100/share
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"""
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mount_point = self._get_mount_point_for_share(smbfs_share)
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df, _ = self._execute('stat', '-f', '-c', '%S %b %a', mount_point,
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run_as_root=True)
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block_size, blocks_total, blocks_avail = map(float, df.split())
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total_available = block_size * blocks_avail
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total_size = block_size * blocks_total
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du, _ = self._execute('du', '-sb', '--apparent-size', '--exclude',
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'*snapshot*', mount_point, run_as_root=True)
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total_allocated = float(du.split()[0])
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return total_size, total_available, total_allocated
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def _find_share(self, volume_size_in_gib):
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"""Choose SMBFS share among available ones for given volume size.
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For instances with more than one share that meets the criteria, the
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share with the least "allocated" space will be selected.
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:param volume_size_in_gib: int size in GB
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"""
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if not self._mounted_shares:
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raise exception.SmbfsNoSharesMounted()
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target_share = None
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target_share_reserved = 0
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for smbfs_share in self._mounted_shares:
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if not self._is_share_eligible(smbfs_share, volume_size_in_gib):
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continue
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total_allocated = self._get_capacity_info(smbfs_share)[2]
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if target_share is not None:
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if target_share_reserved > total_allocated:
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target_share = smbfs_share
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target_share_reserved = total_allocated
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else:
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target_share = smbfs_share
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target_share_reserved = total_allocated
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if target_share is None:
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raise exception.SmbfsNoSuitableShareFound(
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volume_size=volume_size_in_gib)
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LOG.debug('Selected %s as target smbfs share.' % target_share)
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return target_share
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def _is_share_eligible(self, smbfs_share, volume_size_in_gib):
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"""Verifies SMBFS share is eligible to host volume with given size.
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First validation step: ratio of actual space (used_space / total_space)
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is less than 'smbfs_used_ratio'. Second validation step: apparent space
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allocated (differs from actual space used when using sparse files)
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and compares the apparent available
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space (total_available * smbfs_oversub_ratio) to ensure enough space is
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available for the new volume.
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:param smbfs_share: smbfs share
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:param volume_size_in_gib: int size in GB
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"""
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used_ratio = self.configuration.smbfs_used_ratio
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oversub_ratio = self.configuration.smbfs_oversub_ratio
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requested_volume_size = volume_size_in_gib * units.Gi
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total_size, total_available, total_allocated = \
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self._get_capacity_info(smbfs_share)
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apparent_size = max(0, total_size * oversub_ratio)
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apparent_available = max(0, apparent_size - total_allocated)
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used = (total_size - total_available) / total_size
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if used > used_ratio:
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LOG.debug('%s is above smbfs_used_ratio.' % smbfs_share)
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return False
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if apparent_available <= requested_volume_size:
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LOG.debug('%s is above smbfs_oversub_ratio.' % smbfs_share)
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return False
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if total_allocated / total_size >= oversub_ratio:
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LOG.debug('%s reserved space is above smbfs_oversub_ratio.' %
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smbfs_share)
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return False
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return True
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@utils.synchronized('smbfs', external=False)
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def create_snapshot(self, snapshot):
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"""Apply locking to the create snapshot operation."""
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return self._create_snapshot(snapshot)
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def _create_snapshot_online(self, snapshot, backing_filename,
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new_snap_path):
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msg = _("This driver does not support snapshotting in-use volumes.")
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raise exception.SmbfsException(msg)
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def _delete_snapshot_online(self, context, snapshot, info):
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msg = _("This driver does not support deleting in-use snapshots.")
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raise exception.SmbfsException(msg)
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def _do_create_snapshot(self, snapshot, backing_filename, new_snap_path):
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self._check_snapshot_support(snapshot)
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super(SmbfsDriver, self)._do_create_snapshot(
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snapshot, backing_filename, new_snap_path)
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def _check_snapshot_support(self, snapshot):
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volume_format = self.get_volume_format(snapshot['volume'])
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# qemu-img does not yet support differencing vhd/vhdx
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if volume_format in (self._DISK_FORMAT_VHD, self._DISK_FORMAT_VHDX):
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err_msg = _("Snapshots are not supported for this volume "
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"format: %s") % volume_format
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raise exception.InvalidVolume(err_msg)
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@utils.synchronized('smbfs', external=False)
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def delete_snapshot(self, snapshot):
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"""Apply locking to the delete snapshot operation."""
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return self._delete_snapshot(snapshot)
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@utils.synchronized('smbfs', external=False)
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def extend_volume(self, volume, size_gb):
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LOG.info(_('Extending volume %s.'), volume['id'])
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self._extend_volume(volume, size_gb)
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def _extend_volume(self, volume, size_gb):
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volume_path = self.local_path(volume)
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self._check_extend_volume_support(volume, size_gb)
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LOG.info(_('Resizing file to %sG...') % size_gb)
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self._do_extend_volume(volume_path, size_gb, volume['name'])
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def _do_extend_volume(self, volume_path, size_gb, volume_name):
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info = self._qemu_img_info(volume_path, volume_name)
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fmt = info.file_format
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# Note(lpetrut): as for version 2.0, qemu-img cannot resize
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# vhd/x images. For the moment, we'll just use an intermediary
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# conversion in order to be able to do the resize.
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if fmt in (self._DISK_FORMAT_VHDX, self._DISK_FORMAT_VHD_LEGACY):
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temp_image = volume_path + '.tmp'
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image_utils.convert_image(volume_path, temp_image,
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self._DISK_FORMAT_RAW)
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image_utils.resize_image(temp_image, size_gb)
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image_utils.convert_image(temp_image, volume_path, fmt)
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self._delete(temp_image)
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else:
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image_utils.resize_image(volume_path, size_gb)
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if not self._is_file_size_equal(volume_path, size_gb):
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raise exception.ExtendVolumeError(
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reason='Resizing image file failed.')
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def _check_extend_volume_support(self, volume, size_gb):
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volume_path = self.local_path(volume)
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active_file = self.get_active_image_from_info(volume)
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active_file_path = os.path.join(self._local_volume_dir(volume),
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active_file)
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if active_file_path != volume_path:
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msg = _('Extend volume is only supported for this '
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'driver when no snapshots exist.')
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raise exception.InvalidVolume(msg)
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extend_by = int(size_gb) - volume['size']
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if not self._is_share_eligible(volume['provider_location'],
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extend_by):
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raise exception.ExtendVolumeError(reason='Insufficient space to '
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'extend volume %s to %sG.'
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% (volume['id'], size_gb))
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@utils.synchronized('smbfs', external=False)
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def copy_volume_to_image(self, context, volume, image_service, image_meta):
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self._copy_volume_to_image(context, volume, image_service, image_meta)
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@utils.synchronized('smbfs', external=False)
|
|
def create_volume_from_snapshot(self, volume, snapshot):
|
|
self._create_volume_from_snapshot(volume, snapshot)
|
|
|
|
def _copy_volume_from_snapshot(self, snapshot, volume, volume_size):
|
|
"""Copy data from snapshot to destination volume.
|
|
|
|
This is done with a qemu-img convert to raw/qcow2 from the snapshot
|
|
qcow2.
|
|
"""
|
|
|
|
LOG.debug("Snapshot: %(snap)s, volume: %(vol)s, "
|
|
"volume_size: %(size)s" %
|
|
{'snap': snapshot['id'],
|
|
'vol': volume['id'],
|
|
'size': volume_size})
|
|
|
|
info_path = self._local_path_volume_info(snapshot['volume'])
|
|
snap_info = self._read_info_file(info_path)
|
|
vol_dir = self._local_volume_dir(snapshot['volume'])
|
|
out_format = self.get_volume_format(volume, qemu_format=True)
|
|
|
|
forward_file = snap_info[snapshot['id']]
|
|
forward_path = os.path.join(vol_dir, forward_file)
|
|
|
|
# Find the file which backs this file, which represents the point
|
|
# when this snapshot was created.
|
|
img_info = self._qemu_img_info(forward_path,
|
|
snapshot['volume']['name'])
|
|
path_to_snap_img = os.path.join(vol_dir, img_info.backing_file)
|
|
|
|
LOG.debug("Will copy from snapshot at %s" % path_to_snap_img)
|
|
|
|
image_utils.convert_image(path_to_snap_img,
|
|
self.local_path(volume),
|
|
out_format)
|
|
self._extend_volume(volume, volume_size)
|
|
|
|
self._set_rw_permissions_for_all(self.local_path(volume))
|
|
|
|
def copy_image_to_volume(self, context, volume, image_service, image_id):
|
|
"""Fetch the image from image_service and write it to the volume."""
|
|
volume_format = self.get_volume_format(volume, qemu_format=True)
|
|
image_meta = image_service.show(context, image_id)
|
|
qemu_version = self.get_qemu_version()
|
|
|
|
if (qemu_version < [1, 7] and (
|
|
volume_format == self._DISK_FORMAT_VHDX and
|
|
image_meta['disk_format'] != volume_format)):
|
|
err_msg = _("Unsupported volume format: vhdx. qemu-img 1.7 or "
|
|
"higher is required in order to properly support this "
|
|
"format.")
|
|
raise exception.InvalidVolume(err_msg)
|
|
|
|
image_utils.fetch_to_volume_format(
|
|
context, image_service, image_id,
|
|
self.local_path(volume), volume_format,
|
|
self.configuration.volume_dd_blocksize)
|
|
|
|
self._do_extend_volume(self.local_path(volume),
|
|
volume['size'],
|
|
volume['name'])
|
|
|
|
data = image_utils.qemu_img_info(self.local_path(volume))
|
|
virt_size = data.virtual_size / units.Gi
|
|
if virt_size != volume['size']:
|
|
raise exception.ImageUnacceptable(
|
|
image_id=image_id,
|
|
reason=(_("Expected volume size was %d") % volume['size'])
|
|
+ (_(" but size is now %d.") % virt_size))
|
|
|
|
@utils.synchronized('smbfs', external=False)
|
|
def create_cloned_volume(self, volume, src_vref):
|
|
"""Creates a clone of the specified volume."""
|
|
self._create_cloned_volume(volume, src_vref)
|
|
|
|
def _ensure_share_mounted(self, smbfs_share):
|
|
mnt_flags = []
|
|
if self.shares.get(smbfs_share) is not None:
|
|
mnt_flags = self.shares[smbfs_share]
|
|
# The domain name must be removed from the
|
|
# user name when using Samba.
|
|
mnt_flags = self.parse_credentials(mnt_flags).split()
|
|
self._remotefsclient.mount(smbfs_share, mnt_flags)
|
|
|
|
def parse_options(self, option_str):
|
|
opts_dict = {}
|
|
opts_list = []
|
|
if option_str:
|
|
for i in option_str.split():
|
|
if i == '-o':
|
|
continue
|
|
for j in i.split(','):
|
|
tmp_opt = j.split('=')
|
|
if len(tmp_opt) > 1:
|
|
opts_dict[tmp_opt[0]] = tmp_opt[1]
|
|
else:
|
|
opts_list.append(tmp_opt[0])
|
|
return opts_list, opts_dict
|
|
|
|
def parse_credentials(self, mnt_flags):
|
|
options_list, options_dict = self.parse_options(mnt_flags)
|
|
username = (options_dict.pop('user', None) or
|
|
options_dict.pop('username', None))
|
|
if username:
|
|
# Remove the Domain from the user name
|
|
options_dict['username'] = username.split('\\')[-1]
|
|
else:
|
|
options_dict['username'] = 'guest'
|
|
named_options = ','.join("%s=%s" % (key, val) for (key, val)
|
|
in options_dict.iteritems())
|
|
options_list = ','.join(options_list)
|
|
flags = '-o ' + ','.join([named_options, options_list])
|
|
|
|
return flags.strip(',')
|
|
|
|
def _get_volume_format_spec(self, volume):
|
|
extra_specs = []
|
|
|
|
metadata_specs = volume.get('volume_metadata') or []
|
|
extra_specs += metadata_specs
|
|
|
|
vol_type = volume.get('volume_type')
|
|
if vol_type:
|
|
volume_type_specs = vol_type.get('extra_specs') or []
|
|
extra_specs += volume_type_specs
|
|
|
|
for spec in extra_specs:
|
|
if 'volume_format' in spec.key:
|
|
return spec.value
|
|
return None
|
|
|
|
def _is_file_size_equal(self, path, size):
|
|
"""Checks if file size at path is equal to size."""
|
|
data = image_utils.qemu_img_info(path)
|
|
virt_size = data.virtual_size / units.Gi
|
|
return virt_size == size
|