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# vim: tabstop=4 shiftwidth=4 softtabstop=4
# Copyright (c) 2010 Citrix Systems, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
"""
Management class for Storage-related functions (attach, detach, etc).
"""
from nova import exception
from nova import log as logging
from nova.virt.xenapi.vm_utils import VMHelper
from nova.virt.xenapi.volume_utils import VolumeHelper
from nova.virt.xenapi.volume_utils import StorageError
LOG = logging.getLogger("nova.virt.xenapi.volumeops")
class VolumeOps(object):
"""
Management class for Volume-related tasks
"""
def __init__(self, session):
self.XenAPI = session.get_imported_xenapi()
self._session = session
# Load XenAPI module in the helper classes respectively
VolumeHelper.XenAPI = self.XenAPI
VMHelper.XenAPI = self.XenAPI
def attach_volume(self, instance_name, device_path, mountpoint):
"""Attach volume storage to VM instance"""
# Before we start, check that the VM exists
vm_ref = VMHelper.lookup(self._session, instance_name)
if vm_ref is None:
raise exception.NotFound(_('Instance %s not found')
% instance_name)
# NOTE: No Resource Pool concept so far
LOG.debug(_("Attach_volume: %(instance_name)s, %(device_path)s,"
" %(mountpoint)s") % locals())
# Create the iSCSI SR, and the PDB through which hosts access SRs.
# But first, retrieve target info, like Host, IQN, LUN and SCSIID
vol_rec = VolumeHelper.parse_volume_info(device_path, mountpoint)
label = 'SR-%s' % vol_rec['volumeId']
description = 'Disk-for:%s' % instance_name
# Create SR
sr_ref = VolumeHelper.create_iscsi_storage(self._session,
vol_rec,
label,
description)
# Introduce VDI and attach VBD to VM
try:
vdi_ref = VolumeHelper.introduce_vdi(self._session, sr_ref)
except StorageError, exc:
LOG.exception(exc)
VolumeHelper.destroy_iscsi_storage(self._session, sr_ref)
raise Exception(_('Unable to create VDI on SR %(sr_ref)s for'
' instance %(instance_name)s') % locals())
else:
try:
vbd_ref = VMHelper.create_vbd(self._session,
vm_ref, vdi_ref,
vol_rec['deviceNumber'],
False)
except self.XenAPI.Failure, exc:
LOG.exception(exc)
VolumeHelper.destroy_iscsi_storage(self._session, sr_ref)
raise Exception(_('Unable to use SR %(sr_ref)s for'
' instance %(instance_name)s') % locals())
else:
try:
task = self._session.call_xenapi('Async.VBD.plug',
vbd_ref)
self._session.wait_for_task(task, vol_rec['deviceNumber'])
except self.XenAPI.Failure, exc:
LOG.exception(exc)
VolumeHelper.destroy_iscsi_storage(self._session,
sr_ref)
raise Exception(_('Unable to attach volume to instance %s')
% instance_name)
LOG.info(_('Mountpoint %(mountpoint)s attached to'
' instance %(instance_name)s') % locals())
def detach_volume(self, instance_name, mountpoint):
"""Detach volume storage to VM instance"""
# Before we start, check that the VM exists
vm_ref = VMHelper.lookup(self._session, instance_name)
if vm_ref is None:
raise exception.NotFound(_('Instance %s not found')
% instance_name)
# Detach VBD from VM
LOG.debug(_("Detach_volume: %(instance_name)s, %(mountpoint)s")
% locals())
device_number = VolumeHelper.mountpoint_to_number(mountpoint)
try:
vbd_ref = VMHelper.find_vbd_by_number(self._session,
vm_ref, device_number)
except StorageError, exc:
LOG.exception(exc)
raise Exception(_('Unable to locate volume %s') % mountpoint)
else:
try:
sr_ref = VolumeHelper.find_sr_from_vbd(self._session,
vbd_ref)
VMHelper.unplug_vbd(self._session, vbd_ref)
except StorageError, exc:
LOG.exception(exc)
raise Exception(_('Unable to detach volume %s') % mountpoint)
try:
VMHelper.destroy_vbd(self._session, vbd_ref)
except StorageError, exc:
LOG.exception(exc)
# Forget SR
VolumeHelper.destroy_iscsi_storage(self._session, sr_ref)
LOG.info(_('Mountpoint %(mountpoint)s detached from'
' instance %(instance_name)s') % locals())
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