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OpenStack Study: linuxfc.py**** CubicPower OpenStack Study ****
# (c) Copyright 2013 Hewlett-Packard Development Company, L.P. # # 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. """Generic linux Fibre Channel utilities.""" import errno from cinder.brick.initiator import linuxscsi from cinder.openstack.common.gettextutils import _ from cinder.openstack.common import log as logging from cinder.openstack.common import processutils as putils LOG = logging.getLogger(__name__)
**** CubicPower OpenStack Study **** class LinuxFibreChannel(linuxscsi.LinuxSCSI):
**** CubicPower OpenStack Study **** def __init__(self, root_helper, execute=putils.execute, *args, **kwargs): super(LinuxFibreChannel, self).__init__(root_helper, execute, *args, **kwargs)
**** CubicPower OpenStack Study **** def rescan_hosts(self, hbas): for hba in hbas: self.echo_scsi_command("/sys/class/scsi_host/%s/scan" % hba['host_device'], "- - -")
**** CubicPower OpenStack Study **** def get_fc_hbas(self): """Get the Fibre Channel HBA information.""" out = None try: out, err = self._execute('systool', '-c', 'fc_host', '-v', run_as_root=True, root_helper=self._root_helper) except putils.ProcessExecutionError as exc: # This handles the case where rootwrap is used # and systool is not installed # 96 = nova.cmd.rootwrap.RC_NOEXECFOUND: if exc.exit_code == 96: LOG.warn(_("systool is not installed")) return [] except OSError as exc: # This handles the case where rootwrap is NOT used # and systool is not installed if exc.errno == errno.ENOENT: LOG.warn(_("systool is not installed")) return [] # No FC HBAs were found if out is None: return [] lines = out.split('\n') # ignore the first 2 lines lines = lines[2:] hbas = [] hba = {} lastline = None for line in lines: line = line.strip() # 2 newlines denotes a new hba port if line == '' and lastline == '': if len(hba) > 0: hbas.append(hba) hba = {} else: val = line.split('=') if len(val) == 2: key = val[0].strip().replace(" ", "") value = val[1].strip() hba[key] = value.replace('"', '') lastline = line return hbas
**** CubicPower OpenStack Study **** def get_fc_hbas_info(self): """Get Fibre Channel WWNs and device paths from the system, if any.""" # Note(walter-boring) modern Linux kernels contain the FC HBA's in /sys # and are obtainable via the systool app hbas = self.get_fc_hbas() if not hbas: return [] hbas_info = [] for hba in hbas: wwpn = hba['port_name'].replace('0x', '') wwnn = hba['node_name'].replace('0x', '') device_path = hba['ClassDevicepath'] device = hba['ClassDevice'] hbas_info.append({'port_name': wwpn, 'node_name': wwnn, 'host_device': device, 'device_path': device_path}) return hbas_info
**** CubicPower OpenStack Study **** def get_fc_wwpns(self): """Get Fibre Channel WWPNs from the system, if any.""" # Note(walter-boring) modern Linux kernels contain the FC HBA's in /sys # and are obtainable via the systool app hbas = self.get_fc_hbas() wwpns = [] if hbas: for hba in hbas: if hba['port_state'] == 'Online': wwpn = hba['port_name'].replace('0x', '') wwpns.append(wwpn) return wwpns
**** CubicPower OpenStack Study **** def get_fc_wwnns(self): """Get Fibre Channel WWNNs from the system, if any.""" # Note(walter-boring) modern Linux kernels contain the FC HBA's in /sys # and are obtainable via the systool app hbas = self.get_fc_hbas() if not hbas: return [] wwnns = [] if hbas: for hba in hbas: if hba['port_state'] == 'Online': wwnn = hba['node_name'].replace('0x', '') wwnns.append(wwnn) return wwnns
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