475 lines
17 KiB
Python
475 lines
17 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# 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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Helper code for the iSCSI volume driver.
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"""
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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 import exception
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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 import utils
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from cinder.volume import utils as volume_utils
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LOG = logging.getLogger(__name__)
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iscsi_helper_opt = [cfg.StrOpt('iscsi_helper',
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default='tgtadm',
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help='iscsi target user-land tool to use'),
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cfg.StrOpt('volumes_dir',
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default='$state_path/volumes',
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help='Volume configuration file storage '
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'directory'),
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cfg.StrOpt('iet_conf',
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default='/etc/iet/ietd.conf',
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help='IET configuration file'),
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cfg.StrOpt('lio_initiator_iqns',
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default='',
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help=('Comma-separatd list of initiator IQNs '
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'allowed to connect to the '
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'iSCSI target. (From Nova compute nodes.)'
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)
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),
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cfg.StrOpt('iscsi_iotype',
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default='fileio',
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help=('Sets the behavior of the iSCSI target '
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'to either perform blockio or fileio '
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'optionally, auto can be set and Cinder '
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'will autodetect type of backing device')
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)
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]
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CONF = cfg.CONF
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CONF.register_opts(iscsi_helper_opt)
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CONF.import_opt('volume_name_template', 'cinder.db')
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class TargetAdmin(object):
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"""iSCSI target administration.
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Base class for iSCSI target admin helpers.
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"""
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def __init__(self, cmd, execute):
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self._cmd = cmd
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self.set_execute(execute)
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def set_execute(self, execute):
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"""Set the function to be used to execute commands."""
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self._execute = execute
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def _run(self, *args, **kwargs):
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self._execute(self._cmd, *args, run_as_root=True, **kwargs)
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def create_iscsi_target(self, name, tid, lun, path,
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chap_auth=None, **kwargs):
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"""Create a iSCSI target and logical unit"""
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raise NotImplementedError()
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def remove_iscsi_target(self, tid, lun, vol_id, **kwargs):
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"""Remove a iSCSI target and logical unit"""
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raise NotImplementedError()
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def _new_target(self, name, tid, **kwargs):
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"""Create a new iSCSI target."""
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raise NotImplementedError()
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def _delete_target(self, tid, **kwargs):
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"""Delete a target."""
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raise NotImplementedError()
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def show_target(self, tid, iqn=None, **kwargs):
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"""Query the given target ID."""
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raise NotImplementedError()
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def _new_logicalunit(self, tid, lun, path, **kwargs):
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"""Create a new LUN on a target using the supplied path."""
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raise NotImplementedError()
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def _delete_logicalunit(self, tid, lun, **kwargs):
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"""Delete a logical unit from a target."""
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raise NotImplementedError()
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class TgtAdm(TargetAdmin):
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"""iSCSI target administration using tgtadm."""
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def __init__(self, execute=utils.execute):
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super(TgtAdm, self).__init__('tgtadm', execute)
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def _get_target(self, iqn):
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(out, err) = self._execute('tgt-admin', '--show', run_as_root=True)
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lines = out.split('\n')
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for line in lines:
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if iqn in line:
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parsed = line.split()
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tid = parsed[1]
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return tid[:-1]
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return None
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def create_iscsi_target(self, name, tid, lun, path,
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chap_auth=None, **kwargs):
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# Note(jdg) tid and lun aren't used by TgtAdm but remain for
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# compatibility
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fileutils.ensure_tree(CONF.volumes_dir)
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vol_id = name.split(':')[1]
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if chap_auth is None:
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volume_conf = """
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<target %s>
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backing-store %s
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</target>
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""" % (name, path)
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else:
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volume_conf = """
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<target %s>
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backing-store %s
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%s
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</target>
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""" % (name, path, chap_auth)
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LOG.info(_('Creating iscsi_target for: %s') % vol_id)
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volumes_dir = CONF.volumes_dir
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volume_path = os.path.join(volumes_dir, vol_id)
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f = open(volume_path, 'w+')
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f.write(volume_conf)
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f.close()
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old_persist_file = None
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old_name = kwargs.get('old_name', None)
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if old_name is not None:
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old_persist_file = os.path.join(volumes_dir, old_name)
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try:
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(out, err) = self._execute('tgt-admin',
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'--update',
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name,
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run_as_root=True)
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except exception.ProcessExecutionError as e:
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LOG.error(_("Failed to create iscsi target for volume "
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"id:%(vol_id)s: %(e)s")
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% {'vol_id': vol_id, 'e': str(e)})
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#Don't forget to remove the persistent file we created
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os.unlink(volume_path)
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raise exception.ISCSITargetCreateFailed(volume_id=vol_id)
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iqn = '%s%s' % (CONF.iscsi_target_prefix, vol_id)
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tid = self._get_target(iqn)
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if tid is None:
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LOG.error(_("Failed to create iscsi target for volume "
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"id:%(vol_id)s. Please ensure your tgtd config file "
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"contains 'include %(volumes_dir)s/*'") % locals())
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raise exception.NotFound()
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if old_persist_file is not None and os.path.exists(old_persist_file):
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os.unlink(old_persist_file)
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return tid
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def remove_iscsi_target(self, tid, lun, vol_id, **kwargs):
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LOG.info(_('Removing iscsi_target for: %s') % vol_id)
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vol_uuid_file = CONF.volume_name_template % vol_id
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volume_path = os.path.join(CONF.volumes_dir, vol_uuid_file)
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if os.path.isfile(volume_path):
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iqn = '%s%s' % (CONF.iscsi_target_prefix,
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vol_uuid_file)
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else:
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raise exception.ISCSITargetRemoveFailed(volume_id=vol_id)
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try:
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# NOTE(vish): --force is a workaround for bug:
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# https://bugs.launchpad.net/cinder/+bug/1159948
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self._execute('tgt-admin',
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'--force',
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'--delete',
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iqn,
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run_as_root=True)
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except exception.ProcessExecutionError as e:
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LOG.error(_("Failed to remove iscsi target for volume "
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"id:%(vol_id)s: %(e)s")
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% {'vol_id': vol_id, 'e': str(e)})
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raise exception.ISCSITargetRemoveFailed(volume_id=vol_id)
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os.unlink(volume_path)
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def show_target(self, tid, iqn=None, **kwargs):
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if iqn is None:
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raise exception.InvalidParameterValue(
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err=_('valid iqn needed for show_target'))
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tid = self._get_target(iqn)
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if tid is None:
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raise exception.NotFound()
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class IetAdm(TargetAdmin):
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"""iSCSI target administration using ietadm."""
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def __init__(self, execute=utils.execute):
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super(IetAdm, self).__init__('ietadm', execute)
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def _iotype(self, path):
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if CONF.iscsi_iotype == 'auto':
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return 'blockio' if volume_utils.is_block(path) else 'fileio'
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else:
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return CONF.iscsi_iotype
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def create_iscsi_target(self, name, tid, lun, path,
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chap_auth=None, **kwargs):
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# NOTE (jdg): Address bug: 1175207
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kwargs.pop('old_name', None)
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self._new_target(name, tid, **kwargs)
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self._new_logicalunit(tid, lun, path, **kwargs)
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if chap_auth is not None:
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(type, username, password) = chap_auth.split()
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self._new_auth(tid, type, username, password, **kwargs)
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conf_file = CONF.iet_conf
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if os.path.exists(conf_file):
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try:
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volume_conf = """
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Target %s
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%s
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Lun 0 Path=%s,Type=%s
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""" % (name, chap_auth, path, self._iotype(path))
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with utils.temporary_chown(conf_file):
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f = open(conf_file, 'a+')
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f.write(volume_conf)
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f.close()
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except exception.ProcessExecutionError as e:
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vol_id = name.split(':')[1]
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LOG.error(_("Failed to create iscsi target for volume "
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"id:%(vol_id)s: %(e)s")
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% {'vol_id': vol_id, 'e': str(e)})
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raise exception.ISCSITargetCreateFailed(volume_id=vol_id)
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return tid
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def remove_iscsi_target(self, tid, lun, vol_id, **kwargs):
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LOG.info(_('Removing iscsi_target for volume: %s') % vol_id)
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self._delete_logicalunit(tid, lun, **kwargs)
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self._delete_target(tid, **kwargs)
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vol_uuid_file = CONF.volume_name_template % vol_id
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conf_file = CONF.iet_conf
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if os.path.exists(conf_file):
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with utils.temporary_chown(conf_file):
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try:
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iet_conf_text = open(conf_file, 'r+')
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full_txt = iet_conf_text.readlines()
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new_iet_conf_txt = []
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count = 0
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for line in full_txt:
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if count > 0:
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count -= 1
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continue
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elif re.search(vol_uuid_file, line):
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count = 2
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continue
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else:
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new_iet_conf_txt.append(line)
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iet_conf_text.seek(0)
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iet_conf_text.truncate(0)
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iet_conf_text.writelines(new_iet_conf_txt)
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finally:
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iet_conf_text.close()
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def _new_target(self, name, tid, **kwargs):
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self._run('--op', 'new',
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'--tid=%s' % tid,
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'--params', 'Name=%s' % name,
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**kwargs)
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def _delete_target(self, tid, **kwargs):
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self._run('--op', 'delete',
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'--tid=%s' % tid,
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**kwargs)
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def show_target(self, tid, iqn=None, **kwargs):
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self._run('--op', 'show',
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'--tid=%s' % tid,
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**kwargs)
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def _new_logicalunit(self, tid, lun, path, **kwargs):
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self._run('--op', 'new',
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'--tid=%s' % tid,
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'--lun=%d' % lun,
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'--params', 'Path=%s,Type=%s' % (path, self._iotype(path)),
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**kwargs)
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def _delete_logicalunit(self, tid, lun, **kwargs):
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self._run('--op', 'delete',
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'--tid=%s' % tid,
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'--lun=%d' % lun,
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**kwargs)
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def _new_auth(self, tid, type, username, password, **kwargs):
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self._run('--op', 'new',
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'--tid=%s' % tid,
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'--user',
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'--params=%s=%s,Password=%s' % (type, username, password),
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**kwargs)
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class FakeIscsiHelper(object):
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def __init__(self):
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self.tid = 1
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def set_execute(self, execute):
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self._execute = execute
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def create_iscsi_target(self, *args, **kwargs):
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self.tid += 1
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return self.tid
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class LioAdm(TargetAdmin):
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"""iSCSI target administration for LIO using python-rtslib."""
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def __init__(self, execute=utils.execute):
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super(LioAdm, self).__init__('rtstool', execute)
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try:
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self._execute('rtstool', 'verify')
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except (OSError, exception.ProcessExecutionError):
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LOG.error(_('rtstool is not installed correctly'))
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raise
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def _get_target(self, iqn):
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(out, err) = self._execute('rtstool',
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'get-targets',
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run_as_root=True)
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lines = out.split('\n')
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for line in lines:
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if iqn in line:
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return line
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return None
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def create_iscsi_target(self, name, tid, lun, path,
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chap_auth=None, **kwargs):
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# tid and lun are not used
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vol_id = name.split(':')[1]
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LOG.info(_('Creating iscsi_target for volume: %s') % vol_id)
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# rtstool requires chap_auth, but unit tests don't provide it
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chap_auth_userid = 'test_id'
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chap_auth_password = 'test_pass'
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if chap_auth != None:
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(chap_auth_userid, chap_auth_password) = chap_auth.split(' ')[1:]
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extra_args = []
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if CONF.lio_initiator_iqns:
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extra_args.append(CONF.lio_initiator_iqns)
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try:
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command_args = ['rtstool',
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'create',
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path,
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name,
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chap_auth_userid,
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chap_auth_password]
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if extra_args != []:
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command_args += extra_args
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self._execute(*command_args, run_as_root=True)
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except exception.ProcessExecutionError as e:
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LOG.error(_("Failed to create iscsi target for volume "
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"id:%(vol_id)s.") % locals())
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LOG.error("%s" % str(e))
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raise exception.ISCSITargetCreateFailed(volume_id=vol_id)
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iqn = '%s%s' % (CONF.iscsi_target_prefix, vol_id)
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tid = self._get_target(iqn)
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if tid is None:
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LOG.error(_("Failed to create iscsi target for volume "
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"id:%(vol_id)s.") % locals())
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raise exception.NotFound()
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return tid
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def remove_iscsi_target(self, tid, lun, vol_id, **kwargs):
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LOG.info(_('Removing iscsi_target: %s') % vol_id)
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vol_uuid_name = 'volume-%s' % vol_id
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iqn = '%s%s' % (CONF.iscsi_target_prefix, vol_uuid_name)
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try:
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self._execute('rtstool',
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'delete',
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iqn,
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run_as_root=True)
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except exception.ProcessExecutionError as e:
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LOG.error(_("Failed to remove iscsi target for volume "
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"id:%(vol_id)s.") % locals())
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LOG.error("%s" % str(e))
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raise exception.ISCSITargetRemoveFailed(volume_id=vol_id)
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def show_target(self, tid, iqn=None, **kwargs):
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if iqn is None:
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raise exception.InvalidParameterValue(
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err=_('valid iqn needed for show_target'))
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tid = self._get_target(iqn)
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if tid is None:
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raise exception.NotFound()
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def initialize_connection(self, volume, connector):
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volume_iqn = volume['provider_location'].split(' ')[1]
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(auth_method, auth_user, auth_pass) = \
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volume['provider_auth'].split(' ', 3)
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# Add initiator iqns to target ACL
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try:
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self._execute('rtstool', 'add-initiator',
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volume_iqn,
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auth_user,
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auth_pass,
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connector['initiator'],
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run_as_root=True)
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except exception.ProcessExecutionError as e:
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LOG.error(_("Failed to add initiator iqn %s to target") %
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connector['initiator'])
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raise exception.ISCSITargetAttachFailed(volume_id=volume['id'])
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def get_target_admin():
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if CONF.iscsi_helper == 'tgtadm':
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return TgtAdm()
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elif CONF.iscsi_helper == 'fake':
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return FakeIscsiHelper()
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elif CONF.iscsi_helper == 'lioadm':
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return LioAdm()
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else:
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return IetAdm()
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