282 lines
11 KiB
Python
282 lines
11 KiB
Python
# Copyright (c) 2013 Mirantis, Inc.
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# All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import os
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import re
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from cinder.brick.iscsi import iscsi
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from cinder import exception
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from cinder.i18n 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.volume import utils
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LOG = logging.getLogger(__name__)
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class _ExportMixin(object):
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def __init__(self, *args, **kwargs):
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self.db = kwargs.pop('db', None)
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super(_ExportMixin, self).__init__(*args, **kwargs)
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def create_export(self, context, volume, volume_path, conf):
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"""Creates an export for a logical volume."""
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iscsi_name = "%s%s" % (conf.iscsi_target_prefix,
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volume['name'])
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max_targets = conf.safe_get('iscsi_num_targets')
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(iscsi_target, lun) = self._get_target_and_lun(context,
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volume,
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max_targets)
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chap_username = utils.generate_username()
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chap_password = utils.generate_password()
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chap_auth = self._iscsi_authentication('IncomingUser',
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chap_username,
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chap_password)
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# NOTE(jdg): For TgtAdm case iscsi_name is the ONLY param we need
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# should clean this all up at some point in the future
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tid = self.create_iscsi_target(iscsi_name,
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iscsi_target,
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0,
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volume_path,
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chap_auth,
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write_cache=
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conf.iscsi_write_cache)
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data = {}
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data['location'] = self._iscsi_location(
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conf.iscsi_ip_address, tid, iscsi_name, conf.iscsi_port, lun)
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data['auth'] = self._iscsi_authentication(
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'CHAP', chap_username, chap_password)
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return data
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def remove_export(self, context, volume):
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try:
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iscsi_target = self._get_iscsi_target(context, volume['id'])
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except exception.NotFound:
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LOG.info(_("Skipping remove_export. No iscsi_target "
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"provisioned for volume: %s"), volume['id'])
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return
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try:
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# NOTE: provider_location may be unset if the volume hasn't
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# been exported
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location = volume['provider_location'].split(' ')
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iqn = location[1]
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# ietadm show will exit with an error
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# this export has already been removed
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self.show_target(iscsi_target, iqn=iqn)
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except Exception:
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LOG.info(_("Skipping remove_export. No iscsi_target "
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"is presently exported for volume: %s"), volume['id'])
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return
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self.remove_iscsi_target(iscsi_target, 0, volume['id'], volume['name'])
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def ensure_export(self, context, volume, iscsi_name, volume_path,
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vg_name, conf, old_name=None):
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iscsi_target = self._get_target_for_ensure_export(context,
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volume['id'])
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if iscsi_target is None:
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LOG.info(_("Skipping remove_export. No iscsi_target "
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"provisioned for volume: %s"), volume['id'])
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return
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chap_auth = None
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# Check for https://bugs.launchpad.net/cinder/+bug/1065702
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old_name = None
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if (volume['provider_location'] is not None and
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volume['name'] not in volume['provider_location']):
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msg = _('Detected inconsistency in provider_location id')
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LOG.debug('%s', msg)
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old_name = self._fix_id_migration(context, volume)
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if 'in-use' in volume['status']:
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old_name = None
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self.create_iscsi_target(iscsi_name, iscsi_target, 0, volume_path,
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chap_auth, check_exit_code=False,
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old_name=old_name,
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write_cache=conf.iscsi_write_cache)
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def _ensure_iscsi_targets(self, context, host, max_targets):
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"""Ensure that target ids have been created in datastore."""
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# NOTE(jdg): tgtadm doesn't use the iscsi_targets table
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# TODO(jdg): In the future move all of the dependent stuff into the
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# cooresponding target admin class
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host_iscsi_targets = self.db.iscsi_target_count_by_host(context,
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host)
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if host_iscsi_targets >= max_targets:
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return
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# NOTE(vish): Target ids start at 1, not 0.
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target_end = max_targets + 1
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for target_num in xrange(1, target_end):
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target = {'host': host, 'target_num': target_num}
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self.db.iscsi_target_create_safe(context, target)
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def _get_target_for_ensure_export(self, context, volume_id):
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try:
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iscsi_target = self.db.volume_get_iscsi_target_num(context,
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volume_id)
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return iscsi_target
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except exception.NotFound:
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return None
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def _get_target_and_lun(self, context, volume, max_targets):
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lun = 0
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self._ensure_iscsi_targets(context, volume['host'], max_targets)
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iscsi_target = self.db.volume_allocate_iscsi_target(context,
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volume['id'],
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volume['host'])
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return iscsi_target, lun
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def _get_iscsi_target(self, context, vol_id):
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return self.db.volume_get_iscsi_target_num(context, vol_id)
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def _iscsi_authentication(self, chap, name, password):
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return "%s %s %s" % (chap, name, password)
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def _iscsi_location(self, ip, target, iqn, port, lun=None):
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return "%s:%s,%s %s %s" % (ip, port,
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target, iqn, lun)
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def _fix_id_migration(self, context, volume, vg_name):
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"""Fix provider_location and dev files to address bug 1065702.
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For volumes that the provider_location has NOT been updated
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and are not currently in-use we'll create a new iscsi target
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and remove the persist file.
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If the volume is in-use, we'll just stick with the old name
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and when detach is called we'll feed back into ensure_export
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again if necessary and fix things up then.
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Details at: https://bugs.launchpad.net/cinder/+bug/1065702
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"""
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model_update = {}
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pattern = re.compile(r":|\s")
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fields = pattern.split(volume['provider_location'])
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old_name = fields[3]
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volume['provider_location'] = \
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volume['provider_location'].replace(old_name, volume['name'])
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model_update['provider_location'] = volume['provider_location']
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self.db.volume_update(context, volume['id'], model_update)
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start = os.getcwd()
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os.chdir('/dev/%s' % vg_name)
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try:
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(out, err) = self._execute('readlink', old_name)
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except putils.ProcessExecutionError:
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link_path = '/dev/%s/%s' % (vg_name,
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old_name)
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LOG.debug('Symbolic link %s not found' % link_path)
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os.chdir(start)
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return
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rel_path = out.rstrip()
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self._execute('ln',
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'-s',
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rel_path, volume['name'],
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run_as_root=True)
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os.chdir(start)
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return old_name
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class TgtAdm(_ExportMixin, iscsi.TgtAdm):
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def _get_target_and_lun(self, context, volume, max_targets):
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lun = 1 # For tgtadm the controller is lun 0, dev starts at lun 1
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iscsi_target = 0 # NOTE(jdg): Not used by tgtadm
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return iscsi_target, lun
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def _get_iscsi_target(self, context, vol_id):
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return 0
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def _get_target_for_ensure_export(self, context, volume_id):
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return 1
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class FakeIscsiHelper(_ExportMixin, iscsi.FakeIscsiHelper):
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def create_export(self, context, volume, volume_path, conf):
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return {
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'location': "fake_location",
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'auth': "fake_auth"
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}
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def remove_export(self, context, volume):
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pass
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def ensure_export(self, context, volume, iscsi_name, volume_path,
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vg_name, conf, old_name=None):
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pass
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class LioAdm(_ExportMixin, iscsi.LioAdm):
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def remove_export(self, context, volume):
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try:
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iscsi_target = self.db.volume_get_iscsi_target_num(context,
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volume['id'])
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except exception.NotFound:
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LOG.info(_("Skipping remove_export. No iscsi_target "
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"provisioned for volume: %s"), volume['id'])
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return
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self.remove_iscsi_target(iscsi_target, 0, volume['id'], volume['name'])
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def ensure_export(self, context, volume, iscsi_name, volume_path,
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vg_name, conf, old_name=None):
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try:
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volume_info = self.db.volume_get(context, volume['id'])
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(auth_method,
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auth_user,
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auth_pass) = volume_info['provider_auth'].split(' ', 3)
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chap_auth = self._iscsi_authentication(auth_method,
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auth_user,
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auth_pass)
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except exception.NotFound:
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LOG.debug("volume_info:%s", volume_info)
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LOG.info(_("Skipping ensure_export. No iscsi_target "
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"provision for volume: %s"), volume['id'])
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iscsi_target = 1
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self.create_iscsi_target(iscsi_name, iscsi_target, 0, volume_path,
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chap_auth, check_exit_code=False)
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class IetAdm(_ExportMixin, iscsi.IetAdm):
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pass
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class ISERTgtAdm(_ExportMixin, iscsi.ISERTgtAdm):
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def _get_target_and_lun(self, context, volume, max_targets):
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lun = 1 # For tgtadm the controller is lun 0, dev starts at lun 1
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iscsi_target = 0 # NOTE(jdg): Not used by tgtadm
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return iscsi_target, lun
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def _get_iscsi_target(self, context, vol_id):
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return 0
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def _get_target_for_ensure_export(self, context, volume_id):
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return 1
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