135 lines
5.4 KiB
Python
135 lines
5.4 KiB
Python
# 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 collections
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import re
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from os_brick import initiator
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from os_brick.initiator import connector
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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 nova import exception
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from nova.i18n import _
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from nova import utils
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from nova.virt.libvirt.volume import fs
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LOG = logging.getLogger(__name__)
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CONF = cfg.CONF
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VzShare = collections.namedtuple('VzShare',
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['cluster_name', 'mds_list', 'password'])
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class LibvirtVZStorageVolumeDriver(fs.LibvirtBaseFileSystemVolumeDriver):
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"""Class implements libvirt part of volume driver for VzStorage."""
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SHARE_FORMAT_REGEX = r'(?:(\S+):/)?([a-zA-Z0-9_-]+)(?::(\S+))?$'
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SHARE_LOCK_NAME = "vz_share-%s"
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def __init__(self, connection):
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super(LibvirtVZStorageVolumeDriver, self).__init__(connection)
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# Check for duplicate options:
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# -c - cluster name
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# -l - log file, includes %(cluster_name)s, so it's handled as a
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# separate config parameter
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# -C - SSD cache file, the same thing with %(cluster_name)s
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# -u, -g, -m - there are default values for these options, so
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# they're separate config parameters
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cfg_opts_set = set(CONF.libvirt.vzstorage_mount_opts)
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invalid_opts_set = set(('-c', '-l', '-C', '-u', '-g', '-m',))
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invalid_cfg_opts = cfg_opts_set.intersection(invalid_opts_set)
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if invalid_cfg_opts:
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msg = (_("You can't use %s options in vzstorage_mount_opts "
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"configuration parameter.") %
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', '.join(invalid_cfg_opts))
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raise exception.InternalError(msg)
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# Call the factory here so we can support
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# more than x86 architectures.
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self.connector = connector.InitiatorConnector.factory(
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initiator.VZSTORAGE, utils.get_root_helper(),
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vzstorage_mount_point_base=CONF.libvirt.vzstorage_mount_point_base)
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def _get_mount_point_base(self):
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return CONF.libvirt.vzstorage_mount_point_base
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def get_config(self, connection_info, disk_info):
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"""Returns xml for libvirt."""
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conf = super(LibvirtVZStorageVolumeDriver,
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self).get_config(connection_info, disk_info)
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conf.source_type = 'file'
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conf.driver_cache = 'writeback'
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conf.source_path = connection_info['data']['device_path']
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conf.driver_format = connection_info['data'].get('format', 'raw')
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return conf
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def _parse_vz_share(self, vz_share):
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m = re.match(self.SHARE_FORMAT_REGEX, vz_share)
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if not m:
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msg = _("Valid share format is "
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"[mds[,mds1[...]]:/]clustername[:password]")
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raise exception.InvalidVolume(msg)
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if m.group(1):
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mds_list = m.group(1).split(',')
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else:
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mds_list = None
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return VzShare(cluster_name=m.group(2),
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mds_list=mds_list,
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password=m.group(3))
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def _get_mount_opts(self, vz_share):
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cluster_name = self._parse_vz_share(vz_share).cluster_name
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# pstorage-mount man page:
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# https://static.openvz.org/vz-man/man1/pstorage-mount.1.gz.html
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mount_opts = ['-u', CONF.libvirt.vzstorage_mount_user,
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'-g', CONF.libvirt.vzstorage_mount_group,
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'-m', CONF.libvirt.vzstorage_mount_perms,
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'-l', (CONF.libvirt.vzstorage_log_path %
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{'cluster_name': cluster_name})]
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if CONF.libvirt.vzstorage_cache_path:
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mount_opts.extend(['-C', (CONF.libvirt.vzstorage_cache_path %
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{'cluster_name': cluster_name})])
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mount_opts.extend(CONF.libvirt.vzstorage_mount_opts)
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return ' '.join(mount_opts)
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def connect_volume(self, connection_info, instance):
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"""Attach the volume to instance_name."""
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vz_share = connection_info['data']['export']
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share_lock = self.SHARE_LOCK_NAME % vz_share
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@utils.synchronized(share_lock)
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def _connect_volume(connection_info, instance):
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LOG.debug("Calling os-brick to mount vzstorage")
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connection_info['data']['options'] = self._get_mount_opts(vz_share)
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device_info = self.connector.connect_volume(
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connection_info['data'])
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LOG.debug("Attached vzstorage volume %s", device_info)
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connection_info['data']['device_path'] = device_info['path']
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return _connect_volume(connection_info, instance)
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def disconnect_volume(self, connection_info, instance):
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"""Detach the volume from instance_name."""
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LOG.debug("calling os-brick to detach Vzstorage Volume",
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instance=instance)
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self.connector.disconnect_volume(connection_info['data'], None)
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LOG.debug("Disconnected Vzstorage Volume", instance=instance)
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