653 lines
26 KiB
Python
653 lines
26 KiB
Python
# Copyright 2010 United States Government as represented by the
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# Administrator of the National Aeronautics and Space Administration.
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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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"""
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Driver for Linux servers running LVM.
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"""
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import math
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import os
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import socket
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from oslo.config import cfg
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from cinder.brick import exception as brick_exception
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from cinder.brick.local_dev import lvm as lvm
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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 fileutils
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from cinder.openstack.common import log as logging
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from cinder.openstack.common import processutils
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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 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.StrOpt('volume_group',
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default='cinder-volumes',
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help='Name for the VG that will contain exported volumes'),
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cfg.IntOpt('lvm_mirrors',
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default=0,
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help='If >0, create LVs with multiple mirrors. Note that '
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'this requires lvm_mirrors + 2 PVs with available space'),
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cfg.StrOpt('lvm_type',
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default='default',
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help='Type of LVM volumes to deploy; (default or thin)'),
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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 LVMVolumeDriver(driver.VolumeDriver):
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"""Executes commands relating to Volumes."""
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VERSION = '2.0.0'
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def __init__(self, vg_obj=None, *args, **kwargs):
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super(LVMVolumeDriver, self).__init__(*args, **kwargs)
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self.configuration.append_config_values(volume_opts)
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self.hostname = socket.gethostname()
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self.vg = vg_obj
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self.backend_name =\
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self.configuration.safe_get('volume_backend_name') or 'LVM'
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self.protocol = 'local'
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def set_execute(self, execute):
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self._execute = execute
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def check_for_setup_error(self):
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"""Verify that requirements are in place to use LVM driver."""
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if self.vg is None:
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root_helper = utils.get_root_helper()
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try:
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self.vg = lvm.LVM(self.configuration.volume_group,
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root_helper,
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lvm_type=self.configuration.lvm_type,
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executor=self._execute)
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except brick_exception.VolumeGroupNotFound:
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message = ("Volume Group %s does not exist" %
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self.configuration.volume_group)
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raise exception.VolumeBackendAPIException(data=message)
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vg_list = volutils.get_all_volume_groups(
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self.configuration.volume_group)
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vg_dict = \
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(vg for vg in vg_list if vg['name'] == self.vg.vg_name).next()
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if vg_dict is None:
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message = ("Volume Group %s does not exist" %
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self.configuration.volume_group)
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raise exception.VolumeBackendAPIException(data=message)
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if self.configuration.lvm_type == 'thin':
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# Specific checks for using Thin provisioned LV's
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if not volutils.supports_thin_provisioning():
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message = ("Thin provisioning not supported "
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"on this version of LVM.")
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raise exception.VolumeBackendAPIException(data=message)
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pool_name = "%s-pool" % self.configuration.volume_group
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if self.vg.get_volume(pool_name) is None:
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try:
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self.vg.create_thin_pool(pool_name)
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except processutils.ProcessExecutionError as exc:
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exception_message = ("Failed to create thin pool, "
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"error message was: %s"
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% exc.stderr)
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raise exception.VolumeBackendAPIException(
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data=exception_message)
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def _sizestr(self, size_in_g):
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if int(size_in_g) == 0:
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return '100m'
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return '%sg' % size_in_g
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def _volume_not_present(self, volume_name):
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return self.vg.get_volume(volume_name) is None
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def _delete_volume(self, volume, is_snapshot=False):
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"""Deletes a logical volume."""
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if self.configuration.volume_clear != 'none' and \
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self.configuration.lvm_type != 'thin':
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self._clear_volume(volume, is_snapshot)
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name = volume['name']
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if is_snapshot:
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name = self._escape_snapshot(volume['name'])
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self.vg.delete(name)
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def _clear_volume(self, volume, is_snapshot=False):
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# zero out old volumes to prevent data leaking between users
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# TODO(ja): reclaiming space should be done lazy and low priority
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if is_snapshot:
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# if the volume to be cleared is a snapshot of another volume
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# we need to clear out the volume using the -cow instead of the
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# directly volume path. We need to skip this if we are using
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# thin provisioned LVs.
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# bug# lp1191812
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dev_path = self.local_path(volume) + "-cow"
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else:
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dev_path = self.local_path(volume)
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# TODO(jdg): Maybe we could optimize this for snaps by looking at
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# the cow table and only overwriting what's necessary?
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# for now we're still skipping on snaps due to hang issue
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if not os.path.exists(dev_path):
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msg = (_('Volume device file path %s does not exist.')
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% dev_path)
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LOG.error(msg)
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raise exception.VolumeBackendAPIException(data=msg)
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size_in_g = volume.get('size', volume.get('volume_size', None))
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if size_in_g is None:
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msg = (_("Size for volume: %s not found, "
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"cannot secure delete.") % volume['id'])
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LOG.error(msg)
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raise exception.InvalidParameterValue(msg)
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# clear_volume expects sizes in MiB, we store integer GiB
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# be sure to convert before passing in
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vol_sz_in_meg = size_in_g * units.Ki
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volutils.clear_volume(
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vol_sz_in_meg, 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 _escape_snapshot(self, snapshot_name):
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# Linux LVM reserves name that starts with snapshot, so that
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# such volume name can't be created. Mangle it.
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if not snapshot_name.startswith('snapshot'):
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return snapshot_name
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return '_' + snapshot_name
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def _create_volume(self, name, size, lvm_type, mirror_count, vg=None):
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vg_ref = self.vg
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if vg is not None:
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vg_ref = vg
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vg_ref.create_volume(name, size, lvm_type, mirror_count)
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def create_volume(self, volume):
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"""Creates a logical volume."""
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mirror_count = 0
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if self.configuration.lvm_mirrors:
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mirror_count = self.configuration.lvm_mirrors
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self._create_volume(volume['name'],
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self._sizestr(volume['size']),
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self.configuration.lvm_type,
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mirror_count)
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def create_volume_from_snapshot(self, volume, snapshot):
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"""Creates a volume from a snapshot."""
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self._create_volume(volume['name'],
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self._sizestr(volume['size']),
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self.configuration.lvm_type,
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self.configuration.lvm_mirrors)
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# Some configurations of LVM do not automatically activate
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# ThinLVM snapshot LVs.
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self.vg.activate_lv(snapshot['name'], is_snapshot=True)
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# copy_volume expects sizes in MiB, we store integer GiB
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# be sure to convert before passing in
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volutils.copy_volume(self.local_path(snapshot),
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self.local_path(volume),
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snapshot['volume_size'] * units.Ki,
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self.configuration.volume_dd_blocksize,
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execute=self._execute)
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def delete_volume(self, volume):
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"""Deletes a logical volume."""
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# NOTE(jdg): We don't need to explicitly call
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# remove export here because we already did it
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# in the manager before we got here.
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if self._volume_not_present(volume['name']):
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# If the volume isn't present, then don't attempt to delete
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return True
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if self.vg.lv_has_snapshot(volume['name']):
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LOG.error(_('Unabled to delete due to existing snapshot '
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'for volume: %s') % volume['name'])
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raise exception.VolumeIsBusy(volume_name=volume['name'])
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self._delete_volume(volume)
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def create_snapshot(self, snapshot):
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"""Creates a snapshot."""
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self.vg.create_lv_snapshot(self._escape_snapshot(snapshot['name']),
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snapshot['volume_name'],
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self.configuration.lvm_type)
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def delete_snapshot(self, snapshot):
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"""Deletes a snapshot."""
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if self._volume_not_present(self._escape_snapshot(snapshot['name'])):
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# If the snapshot isn't present, then don't attempt to delete
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LOG.warning(_("snapshot: %s not found, "
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"skipping delete operations") % snapshot['name'])
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return True
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# TODO(yamahata): zeroing out the whole snapshot triggers COW.
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# it's quite slow.
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self._delete_volume(snapshot, is_snapshot=True)
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def local_path(self, volume, vg=None):
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if vg is None:
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vg = self.configuration.volume_group
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# NOTE(vish): stops deprecation warning
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escaped_group = vg.replace('-', '--')
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escaped_name = self._escape_snapshot(volume['name']).replace('-', '--')
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return "/dev/mapper/%s-%s" % (escaped_group, escaped_name)
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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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"""Creates a clone of the specified volume."""
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mirror_count = 0
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if self.configuration.lvm_mirrors:
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mirror_count = self.configuration.lvm_mirrors
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LOG.info(_('Creating clone of volume: %s') % src_vref['id'])
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volume_name = src_vref['name']
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temp_id = 'tmp-snap-%s' % volume['id']
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temp_snapshot = {'volume_name': volume_name,
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'size': src_vref['size'],
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'volume_size': src_vref['size'],
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'name': 'clone-snap-%s' % volume['id'],
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'id': temp_id}
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self.create_snapshot(temp_snapshot)
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# copy_volume expects sizes in MiB, we store integer GiB
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# be sure to convert before passing in
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try:
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self._create_volume(volume['name'],
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self._sizestr(volume['size']),
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self.configuration.lvm_type,
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mirror_count)
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self.vg.activate_lv(temp_snapshot['name'], is_snapshot=True)
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volutils.copy_volume(
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self.local_path(temp_snapshot),
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self.local_path(volume),
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src_vref['size'] * units.Ki,
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self.configuration.volume_dd_blocksize,
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execute=self._execute)
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finally:
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self.delete_snapshot(temp_snapshot)
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def clone_image(self, volume, image_location, image_id, image_meta):
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return None, False
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def backup_volume(self, context, backup, backup_service):
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"""Create a new backup from an existing volume."""
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volume = self.db.volume_get(context, backup['volume_id'])
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volume_path = self.local_path(volume)
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with utils.temporary_chown(volume_path):
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with fileutils.file_open(volume_path) as volume_file:
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backup_service.backup(backup, volume_file)
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def restore_backup(self, context, backup, volume, backup_service):
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"""Restore an existing backup to a new or existing volume."""
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volume_path = self.local_path(volume)
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with utils.temporary_chown(volume_path):
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with fileutils.file_open(volume_path, 'wb') as volume_file:
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backup_service.restore(backup, volume['id'], volume_file)
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def get_volume_stats(self, refresh=False):
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"""Get volume status.
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If 'refresh' is True, run update the stats first.
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"""
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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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LOG.debug("Updating volume stats")
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if self.vg is None:
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LOG.warning(_('Unable to update stats on non-initialized '
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'Volume Group: %s'), self.configuration.volume_group)
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return
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self.vg.update_volume_group_info()
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data = {}
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# Note(zhiteng): These information are driver/backend specific,
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# each driver may define these values in its own config options
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# or fetch from driver specific configuration file.
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data["volume_backend_name"] = self.backend_name
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data["vendor_name"] = 'Open Source'
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data["driver_version"] = self.VERSION
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data["storage_protocol"] = self.protocol
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data["pools"] = []
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total_capacity = 0
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free_capacity = 0
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if self.configuration.lvm_mirrors > 0:
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total_capacity = \
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self.vg.vg_mirror_size(self.configuration.lvm_mirrors)
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free_capacity = \
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self.vg.vg_mirror_free_space(self.configuration.lvm_mirrors)
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elif self.configuration.lvm_type == 'thin':
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total_capacity = self.vg.vg_thin_pool_size
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free_capacity = self.vg.vg_thin_pool_free_space
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else:
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total_capacity = self.vg.vg_size
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free_capacity = self.vg.vg_free_space
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location_info = \
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('LVMVolumeDriver:%(hostname)s:%(vg)s'
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':%(lvm_type)s:%(lvm_mirrors)s' %
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{'hostname': self.hostname,
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'vg': self.configuration.volume_group,
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'lvm_type': self.configuration.lvm_type,
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'lvm_mirrors': self.configuration.lvm_mirrors})
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# Skip enabled_pools setting, treat the whole backend as one pool
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# XXX FIXME if multipool support is added to LVM driver.
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single_pool = {}
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single_pool.update(dict(
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pool_name=data["volume_backend_name"],
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total_capacity_gb=total_capacity,
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free_capacity_gb=free_capacity,
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reserved_percentage=self.configuration.reserved_percentage,
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location_info=location_info,
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QoS_support=False,
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))
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data["pools"].append(single_pool)
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self._stats = data
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def extend_volume(self, volume, new_size):
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"""Extend an existing volume's size."""
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self.vg.extend_volume(volume['name'],
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self._sizestr(new_size))
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def manage_existing(self, volume, existing_ref):
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"""Manages an existing LV.
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Renames the LV to match the expected name for the volume.
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Error checking done by manage_existing_get_size is not repeated.
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"""
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lv_name = existing_ref['source-name']
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self.vg.get_volume(lv_name)
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# Attempt to rename the LV to match the OpenStack internal name.
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try:
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self.vg.rename_volume(lv_name, volume['name'])
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except processutils.ProcessExecutionError as exc:
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exception_message = (_("Failed to rename logical volume %(name)s, "
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"error message was: %(err_msg)s")
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% {'name': lv_name,
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'err_msg': exc.stderr})
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raise exception.VolumeBackendAPIException(
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data=exception_message)
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def manage_existing_get_size(self, volume, existing_ref):
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"""Return size of an existing LV for manage_existing.
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existing_ref is a dictionary of the form:
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{'source-name': <name of LV>}
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"""
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# Check that the reference is valid
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if 'source-name' not in existing_ref:
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reason = _('Reference must contain source-name element.')
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raise exception.ManageExistingInvalidReference(
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existing_ref=existing_ref, reason=reason)
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lv_name = existing_ref['source-name']
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lv = self.vg.get_volume(lv_name)
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# Raise an exception if we didn't find a suitable LV.
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if not lv:
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kwargs = {'existing_ref': lv_name,
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'reason': 'Specified logical volume does not exist.'}
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raise exception.ManageExistingInvalidReference(**kwargs)
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# LV size is returned in gigabytes. Attempt to parse size as a float
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# and round up to the next integer.
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try:
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lv_size = int(math.ceil(float(lv['size'])))
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except ValueError:
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exception_message = (_("Failed to manage existing volume "
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"%(name)s, because reported size %(size)s "
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"was not a floating-point number.")
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% {'name': lv_name,
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'size': lv['size']})
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raise exception.VolumeBackendAPIException(
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data=exception_message)
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return lv_size
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def get_pool(self, volume):
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return self.backend_name
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class LVMISCSIDriver(LVMVolumeDriver, driver.ISCSIDriver):
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"""Executes commands relating to ISCSI volumes.
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We make use of model provider properties as follows:
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``provider_location``
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if present, contains the iSCSI target information in the same
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format as an ietadm discovery
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i.e. '<ip>:<port>,<portal> <target IQN>'
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``provider_auth``
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if present, contains a space-separated triple:
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'<auth method> <auth username> <auth password>'.
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`CHAP` is the only auth_method in use at the moment.
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"""
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def __init__(self, *args, **kwargs):
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self.db = kwargs.get('db')
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self.target_helper = self.get_target_helper(self.db)
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super(LVMISCSIDriver, self).__init__(*args, **kwargs)
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self.backend_name =\
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self.configuration.safe_get('volume_backend_name') or 'LVM_iSCSI'
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self.protocol = 'iSCSI'
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def set_execute(self, execute):
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super(LVMISCSIDriver, self).set_execute(execute)
|
|
if self.target_helper is not None:
|
|
self.target_helper.set_execute(execute)
|
|
|
|
def _create_target(self, iscsi_name, iscsi_target,
|
|
volume_path, chap_auth, lun=0,
|
|
check_exit_code=False, old_name=None):
|
|
# NOTE(jdg): tgt driver has an issue where with a lot of activity
|
|
# (or sometimes just randomly) it will get *confused* and attempt
|
|
# to reuse a target ID, resulting in a target already exists error
|
|
# Typically a simple retry will address this
|
|
|
|
# For now we have this while loop, might be useful in the
|
|
# future to throw a retry decorator in common or utils
|
|
attempts = 2
|
|
while attempts > 0:
|
|
attempts -= 1
|
|
try:
|
|
# NOTE(jdg): For TgtAdm case iscsi_name is all we need
|
|
# should clean this all up at some point in the future
|
|
|
|
tid = self.target_helper.create_iscsi_target(
|
|
iscsi_name,
|
|
iscsi_target,
|
|
0,
|
|
volume_path,
|
|
chap_auth,
|
|
check_exit_code=check_exit_code,
|
|
old_name=old_name)
|
|
break
|
|
|
|
except brick_exception.ISCSITargetCreateFailed:
|
|
if attempts == 0:
|
|
raise
|
|
else:
|
|
LOG.warning(_('Error creating iSCSI target, retrying '
|
|
'creation for target: %s') % iscsi_name)
|
|
return tid
|
|
|
|
def ensure_export(self, context, volume):
|
|
volume_name = volume['name']
|
|
iscsi_name = "%s%s" % (self.configuration.iscsi_target_prefix,
|
|
volume_name)
|
|
volume_path = "/dev/%s/%s" % (self.configuration.volume_group,
|
|
volume_name)
|
|
# NOTE(jdg): For TgtAdm case iscsi_name is the ONLY param we need
|
|
# should clean this all up at some point in the future
|
|
model_update = self.target_helper.ensure_export(
|
|
context, volume,
|
|
iscsi_name,
|
|
volume_path,
|
|
self.configuration.volume_group,
|
|
self.configuration)
|
|
if model_update:
|
|
self.db.volume_update(context, volume['id'], model_update)
|
|
|
|
def create_export(self, context, volume):
|
|
return self._create_export(context, volume)
|
|
|
|
def _create_export(self, context, volume, vg=None):
|
|
"""Creates an export for a logical volume."""
|
|
if vg is None:
|
|
vg = self.configuration.volume_group
|
|
|
|
volume_path = "/dev/%s/%s" % (vg, volume['name'])
|
|
|
|
data = self.target_helper.create_export(context,
|
|
volume,
|
|
volume_path,
|
|
self.configuration)
|
|
return {
|
|
'provider_location': data['location'],
|
|
'provider_auth': data['auth'],
|
|
}
|
|
|
|
def remove_export(self, context, volume):
|
|
self.target_helper.remove_export(context, volume)
|
|
|
|
def migrate_volume(self, ctxt, volume, host, thin=False, mirror_count=0):
|
|
"""Optimize the migration if the destination is on the same server.
|
|
|
|
If the specified host is another back-end on the same server, and
|
|
the volume is not attached, we can do the migration locally without
|
|
going through iSCSI.
|
|
"""
|
|
|
|
false_ret = (False, None)
|
|
if volume['status'] != 'available':
|
|
return false_ret
|
|
if 'location_info' not in host['capabilities']:
|
|
return false_ret
|
|
info = host['capabilities']['location_info']
|
|
try:
|
|
(dest_type, dest_hostname, dest_vg, lvm_type, lvm_mirrors) =\
|
|
info.split(':')
|
|
lvm_mirrors = int(lvm_mirrors)
|
|
except ValueError:
|
|
return false_ret
|
|
if (dest_type != 'LVMVolumeDriver' or dest_hostname != self.hostname):
|
|
return false_ret
|
|
|
|
if dest_vg != self.vg.vg_name:
|
|
vg_list = volutils.get_all_volume_groups()
|
|
try:
|
|
(vg for vg in vg_list if vg['name'] == dest_vg).next()
|
|
except StopIteration:
|
|
message = (_("Destination Volume Group %s does not exist") %
|
|
dest_vg)
|
|
LOG.error(message)
|
|
return false_ret
|
|
|
|
helper = utils.get_root_helper()
|
|
dest_vg_ref = lvm.LVM(dest_vg, helper,
|
|
lvm_type=lvm_type,
|
|
executor=self._execute)
|
|
self.remove_export(ctxt, volume)
|
|
self._create_volume(volume['name'],
|
|
self._sizestr(volume['size']),
|
|
lvm_type,
|
|
lvm_mirrors,
|
|
dest_vg_ref)
|
|
|
|
volutils.copy_volume(self.local_path(volume),
|
|
self.local_path(volume, vg=dest_vg),
|
|
volume['size'],
|
|
self.configuration.volume_dd_blocksize,
|
|
execute=self._execute)
|
|
self._delete_volume(volume)
|
|
model_update = self._create_export(ctxt, volume, vg=dest_vg)
|
|
|
|
return (True, model_update)
|
|
|
|
def _iscsi_location(self, ip, target, iqn, lun=None):
|
|
return "%s:%s,%s %s %s" % (ip, self.configuration.iscsi_port,
|
|
target, iqn, lun)
|
|
|
|
def _iscsi_authentication(self, chap, name, password):
|
|
return "%s %s %s" % (chap, name, password)
|
|
|
|
|
|
class LVMISERDriver(LVMISCSIDriver, driver.ISERDriver):
|
|
"""Executes commands relating to ISER volumes.
|
|
|
|
We make use of model provider properties as follows:
|
|
|
|
``provider_location``
|
|
if present, contains the iSER target information in the same
|
|
format as an ietadm discovery
|
|
i.e. '<ip>:<port>,<portal> <target IQN>'
|
|
|
|
``provider_auth``
|
|
if present, contains a space-separated triple:
|
|
'<auth method> <auth username> <auth password>'.
|
|
`CHAP` is the only auth_method in use at the moment.
|
|
"""
|
|
|
|
def __init__(self, *args, **kwargs):
|
|
self.target_helper = self.get_target_helper(kwargs.get('db'))
|
|
LVMVolumeDriver.__init__(self, *args, **kwargs)
|
|
self.backend_name =\
|
|
self.configuration.safe_get('volume_backend_name') or 'LVM_iSER'
|
|
self.protocol = 'iSER'
|