335 lines
14 KiB
Python
335 lines
14 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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import os
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from oslo_concurrency import processutils as putils
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from oslo_log import log as logging
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from os_brick.initiator import linuxscsi
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LOG = logging.getLogger(__name__)
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class LinuxFibreChannel(linuxscsi.LinuxSCSI):
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def has_fc_support(self):
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FC_HOST_SYSFS_PATH = '/sys/class/fc_host'
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if os.path.isdir(FC_HOST_SYSFS_PATH):
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return True
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else:
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return False
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def _get_hba_channel_scsi_target_lun(self, hba, conn_props):
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"""Get HBA channels, SCSI targets, LUNs to FC targets for given HBA.
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Given an HBA and the connection properties we look for the HBA channels
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and SCSI targets for each of the FC targets that this HBA has been
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granted permission to connect.
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For drivers that don't return an initiator to target map we try to find
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the info for all the target ports.
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For drivers that return an initiator_target_map we use the
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initiator_target_lun_map entry that was generated by the FC connector
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based on the contents of the connection information data to know which
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target ports to look for.
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:returns: 2-Tuple with the first entry being a list of [c, t, l]
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entries where the target port was found, and the second entry of the
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tuple being a set of luns for ports that were not found.
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"""
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# We want the targets' WWPNs, so we use the initiator_target_map if
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# present for this hba or default to targets if not present.
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targets = conn_props['targets']
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if conn_props.get('initiator_target_map') is not None:
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# This map we try to use was generated by the FC connector
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targets = conn_props['initiator_target_lun_map'].get(
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hba['port_name'], targets)
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# Leave only the number from the host_device field (ie: host6)
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host_device = hba['host_device']
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if host_device and len(host_device) > 4:
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host_device = host_device[4:]
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path = '/sys/class/fc_transport/target%s:' % host_device
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ctls = []
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luns_not_found = set()
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for wwpn, lun in targets:
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cmd = 'grep -Gil "%(wwpns)s" %(path)s*/port_name' % {'wwpns': wwpn,
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'path': path}
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try:
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# We need to run command in shell to expand the * glob
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out, _err = self._execute(cmd, shell=True)
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ctls += [line.split('/')[4].split(':')[1:] + [lun]
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for line in out.split('\n') if line.startswith(path)]
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except Exception as exc:
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LOG.debug('Could not get HBA channel and SCSI target ID, path:'
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' %(path)s*, reason: %(reason)s', {'path': path,
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'reason': exc})
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# If we didn't find any paths add it to the not found list
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luns_not_found.add(lun)
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return ctls, luns_not_found
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def rescan_hosts(self, hbas, connection_properties):
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LOG.debug('Rescaning HBAs %(hbas)s with connection properties '
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'%(conn_props)s', {'hbas': hbas,
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'conn_props': connection_properties})
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# Use initiator_target_lun_map (generated from initiator_target_map by
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# the FC connector) as HBA exclusion map
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ports = connection_properties.get('initiator_target_lun_map')
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if ports:
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hbas = [hba for hba in hbas if hba['port_name'] in ports]
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LOG.debug('Using initiator target map to exclude HBAs: %s',
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hbas)
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# Most storage arrays get their target ports automatically detected
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# by the Linux FC initiator and sysfs gets populated with that
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# information, but there are some that don't. We'll do a narrow scan
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# using the channel, target, and LUN for the former and a wider scan
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# for the latter. If all paths to a former type of array were down on
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# the system boot the array could look like it's of the latter type
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# and make us bring us unwanted volumes into the system by doing a
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# broad scan. To prevent this from happening Cinder drivers can use
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# the "enable_wildcard_scan" key in the connection_info to let us know
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# they don't want us to do broad scans even in those cases.
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broad_scan = connection_properties.get('enable_wildcard_scan', True)
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if not broad_scan:
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LOG.debug('Connection info disallows broad SCSI scanning')
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process = []
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skipped = []
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get_ctls = self._get_hba_channel_scsi_target_lun
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for hba in hbas:
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ctls, luns_wildcards = get_ctls(hba, connection_properties)
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# If we found the target ports, ignore HBAs that din't find them
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if ctls:
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process.append((hba, ctls))
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# If target ports not found and should have, then the HBA is not
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# connected to our storage
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elif not broad_scan:
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LOG.debug('Skipping HBA %s, nothing to scan, target port '
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'not connected to initiator', hba['node_name'])
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# If we haven't found any target ports we may need to do broad
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# SCSI scans
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elif not process:
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skipped.append((hba,
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[('-', '-', lun) for lun in luns_wildcards]))
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# If we didn't find any target ports use wildcards if they are enabled
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process = process or skipped
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for hba, ctls in process:
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for hba_channel, target_id, target_lun in ctls:
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LOG.debug('Scanning %(host)s (wwnn: %(wwnn)s, c: '
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'%(channel)s, t: %(target)s, l: %(lun)s)',
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{'host': hba['host_device'],
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'wwnn': hba['node_name'], 'channel': hba_channel,
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'target': target_id, 'lun': target_lun})
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self.echo_scsi_command(
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"/sys/class/scsi_host/%s/scan" % hba['host_device'],
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"%(c)s %(t)s %(l)s" % {'c': hba_channel,
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't': target_id,
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'l': target_lun})
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def get_fc_hbas(self):
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"""Get the Fibre Channel HBA information."""
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if not self.has_fc_support():
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# there is no FC support in the kernel loaded
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# so there is no need to even try to run systool
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LOG.debug("No Fibre Channel support detected on system.")
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return []
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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.warning("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.warning("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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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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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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wwnns = []
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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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class LinuxFibreChannelS390X(LinuxFibreChannel):
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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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hbas = self.get_fc_hbas()
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hbas_info = []
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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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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 configure_scsi_device(self, device_number, target_wwn, lun):
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"""Write the LUN to the port's unit_add attribute.
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If auto-discovery of Fibre-Channel target ports is
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disabled on s390 platforms, ports need to be added to
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the configuration.
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If auto-discovery of LUNs is disabled on s390 platforms
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luns need to be added to the configuration through the
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unit_add interface
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"""
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LOG.debug("Configure lun for s390: device_number=%(device_num)s "
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"target_wwn=%(target_wwn)s target_lun=%(target_lun)s",
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{'device_num': device_number,
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'target_wwn': target_wwn,
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'target_lun': lun})
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filepath = ("/sys/bus/ccw/drivers/zfcp/%s/%s" %
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(device_number, target_wwn))
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if not (os.path.exists(filepath)):
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zfcp_device_command = ("/sys/bus/ccw/drivers/zfcp/%s/port_rescan" %
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(device_number))
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LOG.debug("port_rescan call for s390: %s", zfcp_device_command)
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try:
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self.echo_scsi_command(zfcp_device_command, "1")
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except putils.ProcessExecutionError as exc:
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LOG.warning("port_rescan call for s390 failed exit"
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" %(code)s, stderr %(stderr)s",
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{'code': exc.exit_code, 'stderr': exc.stderr})
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zfcp_device_command = ("/sys/bus/ccw/drivers/zfcp/%s/%s/unit_add" %
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(device_number, target_wwn))
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LOG.debug("unit_add call for s390 execute: %s", zfcp_device_command)
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try:
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self.echo_scsi_command(zfcp_device_command, lun)
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except putils.ProcessExecutionError as exc:
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LOG.warning("unit_add call for s390 failed exit %(code)s, "
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"stderr %(stderr)s",
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{'code': exc.exit_code, 'stderr': exc.stderr})
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def deconfigure_scsi_device(self, device_number, target_wwn, lun):
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"""Write the LUN to the port's unit_remove attribute.
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If auto-discovery of LUNs is disabled on s390 platforms
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luns need to be removed from the configuration through the
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unit_remove interface
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"""
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LOG.debug("Deconfigure lun for s390: "
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"device_number=%(device_num)s "
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"target_wwn=%(target_wwn)s target_lun=%(target_lun)s",
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{'device_num': device_number,
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'target_wwn': target_wwn,
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'target_lun': lun})
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zfcp_device_command = ("/sys/bus/ccw/drivers/zfcp/%s/%s/unit_remove" %
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(device_number, target_wwn))
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LOG.debug("unit_remove call for s390 execute: %s", zfcp_device_command)
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try:
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self.echo_scsi_command(zfcp_device_command, lun)
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except putils.ProcessExecutionError as exc:
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LOG.warning("unit_remove call for s390 failed exit %(code)s, "
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"stderr %(stderr)s",
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{'code': exc.exit_code, 'stderr': exc.stderr})
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