141 lines
4.8 KiB
Python
141 lines
4.8 KiB
Python
# (c) Copyright 2013 Hewlett-Packard Development Company, L.P.
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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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"""Generic linux Fibre Channel utilities."""
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import errno
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from oslo_concurrency import processutils as putils
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from brick.i18n import _LW
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from brick.initiator import linuxscsi
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from brick.openstack.common import log as logging
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LOG = logging.getLogger(__name__)
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class LinuxFibreChannel(linuxscsi.LinuxSCSI):
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def __init__(self, root_helper, execute=putils.execute,
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*args, **kwargs):
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super(LinuxFibreChannel, self).__init__(root_helper, execute,
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*args, **kwargs)
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def rescan_hosts(self, hbas):
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for hba in hbas:
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self.echo_scsi_command("/sys/class/scsi_host/%s/scan"
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% hba['host_device'], "- - -")
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def get_fc_hbas(self):
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"""Get the Fibre Channel HBA information."""
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out = None
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try:
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out, _err = self._execute('systool', '-c', 'fc_host', '-v',
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run_as_root=True,
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root_helper=self._root_helper)
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except putils.ProcessExecutionError as exc:
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# This handles the case where rootwrap is used
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# and systool is not installed
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# 96 = nova.cmd.rootwrap.RC_NOEXECFOUND:
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if exc.exit_code == 96:
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LOG.warn(_LW("systool is not installed"))
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return []
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except OSError as exc:
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# This handles the case where rootwrap is NOT used
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# and systool is not installed
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if exc.errno == errno.ENOENT:
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LOG.warn(_LW("systool is not installed"))
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return []
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# No FC HBAs were found
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if out is None:
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return []
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lines = out.split('\n')
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# ignore the first 2 lines
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lines = lines[2:]
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hbas = []
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hba = {}
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lastline = None
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for line in lines:
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line = line.strip()
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# 2 newlines denotes a new hba port
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if line == '' and lastline == '':
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if len(hba) > 0:
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hbas.append(hba)
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hba = {}
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else:
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val = line.split('=')
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if len(val) == 2:
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key = val[0].strip().replace(" ", "")
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value = val[1].strip()
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hba[key] = value.replace('"', '')
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lastline = line
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return hbas
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def get_fc_hbas_info(self):
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"""Get Fibre Channel WWNs and device paths from the system, if any."""
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# Note(walter-boring) modern Linux kernels contain the FC HBA's in /sys
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# and are obtainable via the systool app
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hbas = self.get_fc_hbas()
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if not hbas:
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return []
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hbas_info = []
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for hba in hbas:
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wwpn = hba['port_name'].replace('0x', '')
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wwnn = hba['node_name'].replace('0x', '')
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device_path = hba['ClassDevicepath']
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device = hba['ClassDevice']
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hbas_info.append({'port_name': wwpn,
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'node_name': wwnn,
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'host_device': device,
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'device_path': device_path})
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return hbas_info
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def get_fc_wwpns(self):
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"""Get Fibre Channel WWPNs from the system, if any."""
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# Note(walter-boring) modern Linux kernels contain the FC HBA's in /sys
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# and are obtainable via the systool app
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hbas = self.get_fc_hbas()
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wwpns = []
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if hbas:
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for hba in hbas:
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if hba['port_state'] == 'Online':
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wwpn = hba['port_name'].replace('0x', '')
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wwpns.append(wwpn)
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return wwpns
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def get_fc_wwnns(self):
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"""Get Fibre Channel WWNNs from the system, if any."""
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# Note(walter-boring) modern Linux kernels contain the FC HBA's in /sys
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# and are obtainable via the systool app
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hbas = self.get_fc_hbas()
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if not hbas:
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return []
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wwnns = []
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if hbas:
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for hba in hbas:
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if hba['port_state'] == 'Online':
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wwnn = hba['node_name'].replace('0x', '')
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wwnns.append(wwnn)
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return wwnns
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