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# vim: tabstop=4 shiftwidth=4 softtabstop=4
# Copyright 2012 Pedro Navarro Perez
# Copyright 2013 Cloudbase Solutions Srl
# All Rights Reserved.
#
# 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).
"""
import time
from oslo.config import cfg
from nova import exception
from nova.openstack.common.gettextutils import _
from nova.openstack.common import log as logging
from nova.virt import driver
from nova.virt.hyperv import utilsfactory
from nova.virt.hyperv import vmutils
LOG = logging.getLogger(__name__)
hyper_volumeops_opts = [
cfg.IntOpt('volume_attach_retry_count',
default=10,
help='The number of times to retry to attach a volume'),
cfg.IntOpt('volume_attach_retry_interval',
default=5,
help='Interval between volume attachment attempts, in seconds'),
cfg.IntOpt('mounted_disk_query_retry_count',
default=10,
help='The number of times to retry checking for a disk mounted '
'via iSCSI.'),
cfg.IntOpt('mounted_disk_query_retry_interval',
default=5,
help='Interval between checks for a mounted iSCSI '
'disk, in seconds.'),
]
CONF = cfg.CONF
CONF.register_opts(hyper_volumeops_opts, 'hyperv')
CONF.import_opt('host', 'nova.netconf')
CONF.import_opt('my_ip', 'nova.netconf')
class VolumeOps(object):
"""
Management class for Volume-related tasks
"""
def __init__(self):
self._hostutils = utilsfactory.get_hostutils()
self._vmutils = utilsfactory.get_vmutils()
self._volutils = utilsfactory.get_volumeutils()
self._initiator = None
self._default_root_device = 'vda'
def ebs_root_in_block_devices(self, block_device_info):
return self._volutils.volume_in_mapping(self._default_root_device,
block_device_info)
def attach_volumes(self, block_device_info, instance_name, ebs_root):
mapping = driver.block_device_info_get_mapping(block_device_info)
if ebs_root:
self.attach_volume(mapping[0]['connection_info'],
instance_name, True)
mapping = mapping[1:]
for vol in mapping:
self.attach_volume(vol['connection_info'], instance_name)
def login_storage_targets(self, block_device_info):
mapping = driver.block_device_info_get_mapping(block_device_info)
for vol in mapping:
self._login_storage_target(vol['connection_info'])
def _login_storage_target(self, connection_info):
data = connection_info['data']
target_lun = data['target_lun']
target_iqn = data['target_iqn']
target_portal = data['target_portal']
# Check if we already logged in
if self._volutils.get_device_number_for_target(target_iqn, target_lun):
LOG.debug(_("Already logged in on storage target. No need to "
"login. Portal: %(target_portal)s, "
"IQN: %(target_iqn)s, LUN: %(target_lun)s"),
{'target_portal': target_portal,
'target_iqn': target_iqn, 'target_lun': target_lun})
else:
LOG.debug(_("Logging in on storage target. Portal: "
"%(target_portal)s, IQN: %(target_iqn)s, "
"LUN: %(target_lun)s"),
{'target_portal': target_portal,
'target_iqn': target_iqn, 'target_lun': target_lun})
self._volutils.login_storage_target(target_lun, target_iqn,
target_portal)
# Wait for the target to be mounted
self._get_mounted_disk_from_lun(target_iqn, target_lun, True)
def attach_volume(self, connection_info, instance_name, ebs_root=False):
"""
Attach a volume to the SCSI controller or to the IDE controller if
ebs_root is True
"""
target_iqn = None
LOG.debug(_("Attach_volume: %(connection_info)s to %(instance_name)s"),
{'connection_info': connection_info,
'instance_name': instance_name})
try:
self._login_storage_target(connection_info)
data = connection_info['data']
target_lun = data['target_lun']
target_iqn = data['target_iqn']
#Getting the mounted disk
mounted_disk_path = self._get_mounted_disk_from_lun(target_iqn,
target_lun)
if ebs_root:
#Find the IDE controller for the vm.
ctrller_path = self._vmutils.get_vm_ide_controller(
instance_name, 0)
#Attaching to the first slot
slot = 0
else:
#Find the SCSI controller for the vm
ctrller_path = self._vmutils.get_vm_scsi_controller(
instance_name)
slot = self._get_free_controller_slot(ctrller_path)
self._vmutils.attach_volume_to_controller(instance_name,
ctrller_path,
slot,
mounted_disk_path)
except Exception as exn:
LOG.exception(_('Attach volume failed: %s'), exn)
if target_iqn:
self._volutils.logout_storage_target(target_iqn)
raise vmutils.HyperVException(_('Unable to attach volume '
'to instance %s') % instance_name)
def _get_free_controller_slot(self, scsi_controller_path):
#Slots starts from 0, so the length of the disks gives us the free slot
return self._vmutils.get_attached_disks_count(scsi_controller_path)
def detach_volumes(self, block_device_info, instance_name):
mapping = driver.block_device_info_get_mapping(block_device_info)
for vol in mapping:
self.detach_volume(vol['connection_info'], instance_name)
def logout_storage_target(self, target_iqn):
LOG.debug(_("Logging off storage target %s"), target_iqn)
self._volutils.logout_storage_target(target_iqn)
def detach_volume(self, connection_info, instance_name):
"""Detach a volume to the SCSI controller."""
LOG.debug(_("Detach_volume: %(connection_info)s "
"from %(instance_name)s"),
{'connection_info': connection_info,
'instance_name': instance_name})
data = connection_info['data']
target_lun = data['target_lun']
target_iqn = data['target_iqn']
#Getting the mounted disk
mounted_disk_path = self._get_mounted_disk_from_lun(target_iqn,
target_lun)
LOG.debug(_("Detaching physical disk from instance: %s"),
mounted_disk_path)
self._vmutils.detach_vm_disk(instance_name, mounted_disk_path)
self.logout_storage_target(target_iqn)
def get_volume_connector(self, instance):
if not self._initiator:
self._initiator = self._volutils.get_iscsi_initiator()
if not self._initiator:
LOG.warn(_('Could not determine iscsi initiator name'),
instance=instance)
return {
'ip': CONF.my_ip,
'host': CONF.host,
'initiator': self._initiator,
}
def _get_mounted_disk_from_lun(self, target_iqn, target_lun,
wait_for_device=False):
# The WMI query in get_device_number_for_target can incorrectly
# return no data when the system is under load. This issue can
# be avoided by adding a retry.
for i in xrange(CONF.hyperv.mounted_disk_query_retry_count):
device_number = self._volutils.get_device_number_for_target(
target_iqn, target_lun)
if device_number is None:
attempt = i + 1
LOG.debug(_('Attempt %d to get device_number '
'from get_device_number_for_target failed. '
'Retrying...') % attempt)
time.sleep(CONF.hyperv.mounted_disk_query_retry_interval)
else:
break
if device_number is None:
raise exception.NotFound(_('Unable to find a mounted disk for '
'target_iqn: %s') % target_iqn)
LOG.debug(_('Device number: %(device_number)s, '
'target lun: %(target_lun)s'),
{'device_number': device_number, 'target_lun': target_lun})
#Finding Mounted disk drive
for i in range(0, CONF.hyperv.volume_attach_retry_count):
mounted_disk_path = self._vmutils.get_mounted_disk_by_drive_number(
device_number)
if mounted_disk_path or not wait_for_device:
break
time.sleep(CONF.hyperv.volume_attach_retry_interval)
if not mounted_disk_path:
raise exception.NotFound(_('Unable to find a mounted disk '
'for target_iqn: %s') % target_iqn)
return mounted_disk_path
def disconnect_volume(self, physical_drive_path):
#Get the session_id of the ISCSI connection
session_id = self._volutils.get_session_id_from_mounted_disk(
physical_drive_path)
#Logging out the target
self._volutils.execute_log_out(session_id)
def get_target_from_disk_path(self, physical_drive_path):
return self._volutils.get_target_from_disk_path(physical_drive_path)
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