Volume discovery and local storage management lib
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# 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.
from oslo_log import log as logging
from os_brick import initiator
from os_brick.initiator.connectors import fibre_channel
from os_brick.initiator import linuxfc
LOG = logging.getLogger(__name__)
class FibreChannelConnectorS390X(fibre_channel.FibreChannelConnector):
"""Connector class to attach/detach Fibre Channel volumes on S390X arch."""
platform = initiator.PLATFORM_S390
def __init__(self, root_helper, driver=None,
execute=None, use_multipath=False,
device_scan_attempts=initiator.DEVICE_SCAN_ATTEMPTS_DEFAULT,
*args, **kwargs):
super(FibreChannelConnectorS390X, self).__init__(
root_helper,
driver=driver,
execute=execute,
device_scan_attempts=device_scan_attempts,
*args, **kwargs)
LOG.debug("Initializing Fibre Channel connector for S390")
self._linuxfc = linuxfc.LinuxFibreChannelS390X(root_helper, execute)
self.use_multipath = use_multipath
def set_execute(self, execute):
super(FibreChannelConnectorS390X, self).set_execute(execute)
self._linuxscsi.set_execute(execute)
self._linuxfc.set_execute(execute)
def _get_host_devices(self, possible_devs, lun):
host_devices = []
for pci_num, target_wwn in possible_devs:
host_device = self._get_device_file_path(
pci_num,
target_wwn,
lun)
# NOTE(arne_r)
# LUN driver path is the same on all distros, so no need to have
# multiple calls here
self._linuxfc.configure_scsi_device(pci_num, target_wwn,
self._get_lun_string(lun))
host_devices.extend(host_device)
return host_devices
def _get_lun_string(self, lun):
target_lun = 0
if lun <= 0xffff:
target_lun = "0x%04x000000000000" % lun
elif lun <= 0xffffffff:
target_lun = "0x%08x00000000" % lun
return target_lun
def _get_device_file_path(self, pci_num, target_wwn, lun):
# NOTE(arne_r)
# Need to add multiple possible ways to resolve device paths,
# depending on OS. Since it gets passed to '_get_possible_volume_paths'
# having a mismatch is not a problem
host_device = [
# RHEL based
"/dev/disk/by-path/ccw-%s-zfcp-%s:%s" % (
pci_num, target_wwn, self._get_lun_string(lun)),
# Debian based (e.g. for storwize)
"/dev/disk/by-path/ccw-%s-fc-%s-lun-%s" % (
pci_num, target_wwn, lun),
# Debian based (e.g. for ds8k)
"/dev/disk/by-path/ccw-%s-fc-%s-lun-%s" % (
pci_num, target_wwn, self._get_lun_string(lun)),
]
return host_device
def _remove_devices(self, connection_properties, devices, device_info):
hbas = self._linuxfc.get_fc_hbas_info()
ports = connection_properties['target_wwn']
possible_devs = self._get_possible_devices(hbas, ports)
lun = connection_properties.get('target_lun', 0)
target_lun = self._get_lun_string(lun)
for pci_num, target_wwn in possible_devs:
self._linuxfc.deconfigure_scsi_device(pci_num,
target_wwn,
target_lun)