05e60a9d07
There is a case where `multipathd show status` should fail, yet it
doesn't exit with an error code. Instead it returns 0. Error is printed
to stdout as "error receiving packet".
This means that enforce will not work as expected.
The multipathd error got fixed here:
https://www.redhat.com/archives/dm-devel/2015-March/msg00136.html
But that patch is missing in some packages, so this patch adds a
workaround to detect the error base on the stdout of the multipathd show
status command.
Closes-Bug: #1789699
Change-Id: I1cb29782541e3fe53b0b1744ab36f56464cd2135
(cherry picked from commit 028af871de)
671 lines
27 KiB
Python
671 lines
27 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 scsi subsystem and Multipath utilities.
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Note, this is not iSCSI.
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"""
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import glob
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import os
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import re
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import six
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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 import exception
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from os_brick import executor
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from os_brick.privileged import rootwrap as priv_rootwrap
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from os_brick import utils
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LOG = logging.getLogger(__name__)
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MULTIPATH_ERROR_REGEX = re.compile("\w{3} \d+ \d\d:\d\d:\d\d \|.*$")
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MULTIPATH_WWID_REGEX = re.compile("\((?P<wwid>.+)\)")
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MULTIPATH_DEVICE_ACTIONS = ['unchanged:', 'reject:', 'reload:',
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'switchpg:', 'rename:', 'create:',
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'resize:']
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class LinuxSCSI(executor.Executor):
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# As found in drivers/scsi/scsi_lib.c
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WWN_TYPES = {'t10.': '1', 'eui.': '2', 'naa.': '3'}
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def echo_scsi_command(self, path, content):
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"""Used to echo strings to scsi subsystem."""
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args = ["-a", path]
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kwargs = dict(process_input=content,
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run_as_root=True,
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root_helper=self._root_helper)
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self._execute('tee', *args, **kwargs)
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def get_name_from_path(self, path):
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"""Translates /dev/disk/by-path/ entry to /dev/sdX."""
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name = os.path.realpath(path)
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if name.startswith("/dev/"):
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return name
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else:
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return None
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def remove_scsi_device(self, device, force=False, exc=None,
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flush=True):
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"""Removes a scsi device based upon /dev/sdX name."""
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path = "/sys/block/%s/device/delete" % device.replace("/dev/", "")
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if os.path.exists(path):
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exc = exception.ExceptionChainer() if exc is None else exc
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if flush:
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# flush any outstanding IO first
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with exc.context(force, 'Flushing %s failed', device):
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self.flush_device_io(device)
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LOG.debug("Remove SCSI device %(device)s with %(path)s",
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{'device': device, 'path': path})
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with exc.context(force, 'Removing %s failed', device):
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self.echo_scsi_command(path, "1")
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@utils.retry(exceptions=exception.VolumePathNotRemoved)
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def wait_for_volumes_removal(self, volumes_names):
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"""Wait for device paths to be removed from the system."""
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str_names = ', '.join(volumes_names)
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LOG.debug('Checking to see if SCSI volumes %s have been removed.',
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str_names)
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exist = [volume_name for volume_name in volumes_names
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if os.path.exists('/dev/' + volume_name)]
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if exist:
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LOG.debug('%s still exist.', ', '.join(exist))
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raise exception.VolumePathNotRemoved(volume_path=exist)
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LOG.debug("SCSI volumes %s have been removed.", str_names)
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def get_device_info(self, device):
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(out, _err) = self._execute('sg_scan', device, run_as_root=True,
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root_helper=self._root_helper)
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dev_info = {'device': device, 'host': None,
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'channel': None, 'id': None, 'lun': None}
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if out:
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line = out.strip()
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line = line.replace(device + ": ", "")
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info = line.split(" ")
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for item in info:
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if '=' in item:
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pair = item.split('=')
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dev_info[pair[0]] = pair[1]
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elif 'scsi' in item:
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dev_info['host'] = item.replace('scsi', '')
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return dev_info
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def get_sysfs_wwn(self, device_names):
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"""Return the wwid from sysfs in any of devices in udev format."""
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wwid = self.get_sysfs_wwid(device_names)
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glob_str = '/dev/disk/by-id/scsi-'
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wwn_paths = glob.glob(glob_str + '*')
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# If we don't have multiple designators on page 0x83
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if wwid and glob_str + wwid in wwn_paths:
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return wwid
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# If we have multiple designators follow the symlinks
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for wwn_path in wwn_paths:
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try:
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if os.path.islink(wwn_path) and os.stat(wwn_path):
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path = os.path.realpath(wwn_path)
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if path.startswith('/dev/') and path[5:] in device_names:
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return wwn_path[len(glob_str):]
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except OSError:
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continue
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return ''
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def get_sysfs_wwid(self, device_names):
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"""Return the wwid from sysfs in any of devices in udev format."""
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for device_name in device_names:
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try:
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with open('/sys/block/%s/device/wwid' % device_name) as f:
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wwid = f.read().strip()
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except IOError:
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continue
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# The sysfs wwid has the wwn type in string format as a prefix,
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# but udev uses its numerical representation as returned by
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# scsi_id's page 0x83, so we need to map it
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udev_wwid = self.WWN_TYPES.get(wwid[:4], '8') + wwid[4:]
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return udev_wwid
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return ''
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def get_scsi_wwn(self, path):
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"""Read the WWN from page 0x83 value for a SCSI device."""
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(out, _err) = self._execute('/lib/udev/scsi_id', '--page', '0x83',
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'--whitelisted', path,
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run_as_root=True,
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root_helper=self._root_helper)
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return out.strip()
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@staticmethod
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def is_multipath_running(enforce_multipath, root_helper, execute=None):
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try:
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if execute is None:
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execute = priv_rootwrap.execute
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cmd = ('multipathd', 'show', 'status')
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out, _err = execute(*cmd, run_as_root=True,
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root_helper=root_helper)
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# There was a bug in multipathd where it didn't return an error
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# code and just printed the error message in stdout.
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if out and out.startswith('error receiving packet'):
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raise putils.ProcessExecutionError('', out, 1, cmd, None)
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except putils.ProcessExecutionError as err:
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LOG.error('multipathd is not running: exit code %(err)s',
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{'err': err.exit_code})
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if enforce_multipath:
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raise
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return False
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return True
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def get_dm_name(self, dm):
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"""Get the Device map name given the device name of the dm on sysfs.
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:param dm: Device map name as seen in sysfs. ie: 'dm-0'
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:returns: String with the name, or empty string if not available.
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ie: '36e843b658476b7ed5bc1d4d10d9b1fde'
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"""
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try:
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with open('/sys/block/' + dm + '/dm/name') as f:
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return f.read().strip()
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except IOError:
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return ''
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def find_sysfs_multipath_dm(self, device_names):
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"""Find the dm device name given a list of device names
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:param device_names: Iterable with device names, not paths. ie: ['sda']
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:returns: String with the dm name or None if not found. ie: 'dm-0'
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"""
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glob_str = '/sys/block/%s/holders/dm-*'
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for dev_name in device_names:
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dms = glob.glob(glob_str % dev_name)
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if dms:
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__, device_name, __, dm = dms[0].rsplit('/', 3)
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return dm
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return None
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@staticmethod
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def get_dev_path(connection_properties, device_info):
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"""Determine what path was used by Nova/Cinder to access volume."""
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if device_info and device_info.get('path'):
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return device_info.get('path')
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return connection_properties.get('device_path') or ''
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@staticmethod
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def requires_flush(path, path_used, was_multipath):
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"""Check if a device needs to be flushed when detaching.
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A device representing a single path connection to a volume must only be
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flushed if it has been used directly by Nova or Cinder to write data.
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If the path has been used via a multipath DM or if the device was part
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of a multipath but a different single path was used for I/O (instead of
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the multipath) then we don't need to flush.
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"""
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# No used path happens on failed attachs, when we don't care about
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# individual flushes.
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# When Nova used a multipath we don't need to do individual flushes.
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if not path_used or was_multipath:
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return False
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# We need to flush the single path that was used.
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# For encrypted volumes the symlink has been replaced, so realpath
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# won't return device under /dev but under /dev/disk/...
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path = os.path.realpath(path)
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path_used = os.path.realpath(path_used)
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return path_used == path or '/dev' != os.path.split(path_used)[0]
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def remove_connection(self, devices_names, is_multipath, force=False,
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exc=None, path_used=None, was_multipath=False):
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"""Remove LUNs and multipath associated with devices names.
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:param devices_names: Iterable with real device names ('sda', 'sdb')
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:param is_multipath: Whether this is a multipath connection or not
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:param force: Whether to forcefully disconnect even if flush fails.
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:param exc: ExceptionChainer where to add exceptions if forcing
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:param path_used: What path was used by Nova/Cinder for I/O
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:param was_multipath: If the path used for I/O was a multipath
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:returns: Multipath device map name if found and not flushed
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"""
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if not devices_names:
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return
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multipath_name = None
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exc = exception.ExceptionChainer() if exc is None else exc
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LOG.debug('Removing %(type)s devices %(devices)s',
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{'type': 'multipathed' if is_multipath else 'single pathed',
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'devices': ', '.join(devices_names)})
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if is_multipath:
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multipath_dm = self.find_sysfs_multipath_dm(devices_names)
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multipath_name = multipath_dm and self.get_dm_name(multipath_dm)
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if multipath_name:
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with exc.context(force, 'Flushing %s failed', multipath_name):
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self.flush_multipath_device(multipath_name)
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multipath_name = None
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for device_name in devices_names:
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dev_path = '/dev/' + device_name
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flush = self.requires_flush(dev_path, path_used, was_multipath)
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self.remove_scsi_device(dev_path, force, exc, flush)
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# Wait until the symlinks are removed
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with exc.context(force, 'Some devices remain from %s', devices_names):
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try:
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self.wait_for_volumes_removal(devices_names)
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finally:
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# Since we use /dev/disk/by-id/scsi- links to get the wwn we
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# must ensure they are always removed.
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self._remove_scsi_symlinks(devices_names)
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return multipath_name
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def _remove_scsi_symlinks(self, devices_names):
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devices = ['/dev/' + dev for dev in devices_names]
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links = glob.glob('/dev/disk/by-id/scsi-*')
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unlink = []
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for link in links:
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try:
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if os.path.realpath(link) in devices:
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unlink.append(link)
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except OSError:
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# A race condition in Python's posixpath:realpath just occurred
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# so we can ignore it because the file was just removed between
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# a check if file exists and a call to os.readlink
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continue
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if unlink:
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priv_rootwrap.unlink_root(no_errors=True, *unlink)
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def flush_device_io(self, device):
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"""This is used to flush any remaining IO in the buffers."""
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if os.path.exists(device):
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try:
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# NOTE(geguileo): With 30% connection error rates flush can get
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# stuck, set timeout to prevent it from hanging here forever.
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# Retry twice after 20 and 40 seconds.
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LOG.debug("Flushing IO for device %s", device)
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self._execute('blockdev', '--flushbufs', device,
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run_as_root=True, attempts=3, timeout=300,
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interval=10, root_helper=self._root_helper)
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except putils.ProcessExecutionError as exc:
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LOG.warning("Failed to flush IO buffers prior to removing "
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"device: %(code)s", {'code': exc.exit_code})
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raise
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def flush_multipath_device(self, device_map_name):
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LOG.debug("Flush multipath device %s", device_map_name)
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# NOTE(geguileo): With 30% connection error rates flush can get stuck,
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# set timeout to prevent it from hanging here forever. Retry twice
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# after 20 and 40 seconds.
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self._execute('multipath', '-f', device_map_name, run_as_root=True,
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attempts=3, timeout=300, interval=10,
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root_helper=self._root_helper)
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@utils.retry(exceptions=exception.VolumeDeviceNotFound)
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def wait_for_path(self, volume_path):
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"""Wait for a path to show up."""
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LOG.debug("Checking to see if %s exists yet.",
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volume_path)
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if not os.path.exists(volume_path):
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LOG.debug("%(path)s doesn't exists yet.", {'path': volume_path})
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raise exception.VolumeDeviceNotFound(
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device=volume_path)
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else:
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LOG.debug("%s has shown up.", volume_path)
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@utils.retry(exceptions=exception.BlockDeviceReadOnly, retries=5)
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def wait_for_rw(self, wwn, device_path):
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"""Wait for block device to be Read-Write."""
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LOG.debug("Checking to see if %s is read-only.",
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device_path)
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out, info = self._execute('lsblk', '-o', 'NAME,RO', '-l', '-n')
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LOG.debug("lsblk output: %s", out)
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blkdevs = out.splitlines()
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for blkdev in blkdevs:
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# Entries might look like:
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#
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# "3624a93709a738ed78583fd120013902b (dm-1) 1"
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#
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# or
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#
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# "sdd 0"
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#
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# We are looking for the first and last part of them. For FC
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# multipath devices the name is in the format of '<WWN> (dm-<ID>)'
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blkdev_parts = blkdev.split(' ')
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ro = blkdev_parts[-1]
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name = blkdev_parts[0]
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# We must validate that all pieces of the dm-# device are rw,
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# if some are still ro it can cause problems.
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if wwn in name and int(ro) == 1:
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LOG.debug("Block device %s is read-only", device_path)
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self._execute('multipath', '-r', check_exit_code=[0, 1, 21],
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run_as_root=True, root_helper=self._root_helper)
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raise exception.BlockDeviceReadOnly(
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device=device_path)
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else:
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LOG.debug("Block device %s is not read-only.", device_path)
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def find_multipath_device_path(self, wwn):
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"""Look for the multipath device file for a volume WWN.
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Multipath devices can show up in several places on
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a linux system.
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1) When multipath friendly names are ON:
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a device file will show up in
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/dev/disk/by-id/dm-uuid-mpath-<WWN>
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/dev/disk/by-id/dm-name-mpath<N>
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/dev/disk/by-id/scsi-mpath<N>
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/dev/mapper/mpath<N>
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2) When multipath friendly names are OFF:
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/dev/disk/by-id/dm-uuid-mpath-<WWN>
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/dev/disk/by-id/scsi-<WWN>
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/dev/mapper/<WWN>
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"""
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LOG.info("Find Multipath device file for volume WWN %(wwn)s",
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{'wwn': wwn})
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# First look for the common path
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wwn_dict = {'wwn': wwn}
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path = "/dev/disk/by-id/dm-uuid-mpath-%(wwn)s" % wwn_dict
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try:
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self.wait_for_path(path)
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return path
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except exception.VolumeDeviceNotFound:
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pass
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# for some reason the common path wasn't found
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# lets try the dev mapper path
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path = "/dev/mapper/%(wwn)s" % wwn_dict
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try:
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self.wait_for_path(path)
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return path
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except exception.VolumeDeviceNotFound:
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pass
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# couldn't find a path
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LOG.warning("couldn't find a valid multipath device path for "
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"%(wwn)s", wwn_dict)
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return None
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def find_multipath_device(self, device):
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"""Discover multipath devices for a mpath device.
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This uses the slow multipath -l command to find a
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multipath device description, then screen scrapes
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the output to discover the multipath device name
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and it's devices.
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"""
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mdev = None
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devices = []
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out = None
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try:
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(out, _err) = self._execute('multipath', '-l', device,
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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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LOG.warning("multipath call failed exit %(code)s",
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{'code': exc.exit_code})
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raise exception.CommandExecutionFailed(
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cmd='multipath -l %s' % device)
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if out:
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lines = out.strip()
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lines = lines.split("\n")
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lines = [line for line in lines
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if not re.match(MULTIPATH_ERROR_REGEX, line)
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and len(line)]
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if lines:
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mdev_name = lines[0].split(" ")[0]
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if mdev_name in MULTIPATH_DEVICE_ACTIONS:
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mdev_name = lines[0].split(" ")[1]
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mdev = '/dev/mapper/%s' % mdev_name
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# Confirm that the device is present.
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try:
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os.stat(mdev)
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except OSError:
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LOG.warning("Couldn't find multipath device %s",
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mdev)
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return None
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wwid_search = MULTIPATH_WWID_REGEX.search(lines[0])
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|
if wwid_search is not None:
|
|
mdev_id = wwid_search.group('wwid')
|
|
else:
|
|
mdev_id = mdev_name
|
|
|
|
LOG.debug("Found multipath device = %(mdev)s",
|
|
{'mdev': mdev})
|
|
device_lines = lines[3:]
|
|
for dev_line in device_lines:
|
|
if dev_line.find("policy") != -1:
|
|
continue
|
|
|
|
dev_line = dev_line.lstrip(' |-`')
|
|
dev_info = dev_line.split()
|
|
address = dev_info[0].split(":")
|
|
|
|
dev = {'device': '/dev/%s' % dev_info[1],
|
|
'host': address[0], 'channel': address[1],
|
|
'id': address[2], 'lun': address[3]
|
|
}
|
|
|
|
devices.append(dev)
|
|
|
|
if mdev is not None:
|
|
info = {"device": mdev,
|
|
"id": mdev_id,
|
|
"name": mdev_name,
|
|
"devices": devices}
|
|
return info
|
|
return None
|
|
|
|
def get_device_size(self, device):
|
|
"""Get the size in bytes of a volume."""
|
|
(out, _err) = self._execute('blockdev', '--getsize64',
|
|
device, run_as_root=True,
|
|
root_helper=self._root_helper)
|
|
var = six.text_type(out.strip())
|
|
if var.isnumeric():
|
|
return int(var)
|
|
else:
|
|
return None
|
|
|
|
def multipath_reconfigure(self):
|
|
"""Issue a multipathd reconfigure.
|
|
|
|
When attachments come and go, the multipathd seems
|
|
to get lost and not see the maps. This causes
|
|
resize map to fail 100%. To overcome this we have
|
|
to issue a reconfigure prior to resize map.
|
|
"""
|
|
(out, _err) = self._execute('multipathd', 'reconfigure',
|
|
run_as_root=True,
|
|
root_helper=self._root_helper)
|
|
return out
|
|
|
|
def multipath_resize_map(self, mpath_id):
|
|
"""Issue a multipath resize map on device.
|
|
|
|
This forces the multipath daemon to update it's
|
|
size information a particular multipath device.
|
|
"""
|
|
(out, _err) = self._execute('multipathd', 'resize', 'map', mpath_id,
|
|
run_as_root=True,
|
|
root_helper=self._root_helper)
|
|
return out
|
|
|
|
def extend_volume(self, volume_paths):
|
|
"""Signal the SCSI subsystem to test for volume resize.
|
|
|
|
This function tries to signal the local system's kernel
|
|
that an already attached volume might have been resized.
|
|
"""
|
|
LOG.debug("extend volume %s", volume_paths)
|
|
|
|
for volume_path in volume_paths:
|
|
device = self.get_device_info(volume_path)
|
|
LOG.debug("Volume device info = %s", device)
|
|
device_id = ("%(host)s:%(channel)s:%(id)s:%(lun)s" %
|
|
{'host': device['host'],
|
|
'channel': device['channel'],
|
|
'id': device['id'],
|
|
'lun': device['lun']})
|
|
|
|
scsi_path = ("/sys/bus/scsi/drivers/sd/%(device_id)s" %
|
|
{'device_id': device_id})
|
|
|
|
size = self.get_device_size(volume_path)
|
|
LOG.debug("Starting size: %s", size)
|
|
|
|
# now issue the device rescan
|
|
rescan_path = "%(scsi_path)s/rescan" % {'scsi_path': scsi_path}
|
|
self.echo_scsi_command(rescan_path, "1")
|
|
new_size = self.get_device_size(volume_path)
|
|
LOG.debug("volume size after scsi device rescan %s", new_size)
|
|
|
|
scsi_wwn = self.get_scsi_wwn(volume_paths[0])
|
|
mpath_device = self.find_multipath_device_path(scsi_wwn)
|
|
if mpath_device:
|
|
# Force a reconfigure so that resize works
|
|
self.multipath_reconfigure()
|
|
|
|
size = self.get_device_size(mpath_device)
|
|
LOG.info("mpath(%(device)s) current size %(size)s",
|
|
{'device': mpath_device, 'size': size})
|
|
result = self.multipath_resize_map(scsi_wwn)
|
|
if 'fail' in result:
|
|
LOG.error("Multipathd failed to update the size mapping of "
|
|
"multipath device %(scsi_wwn)s volume %(volume)s",
|
|
{'scsi_wwn': scsi_wwn, 'volume': volume_paths})
|
|
return None
|
|
|
|
new_size = self.get_device_size(mpath_device)
|
|
LOG.info("mpath(%(device)s) new size %(size)s",
|
|
{'device': mpath_device, 'size': new_size})
|
|
|
|
return new_size
|
|
|
|
def process_lun_id(self, lun_ids):
|
|
if isinstance(lun_ids, list):
|
|
processed = []
|
|
for x in lun_ids:
|
|
x = self._format_lun_id(x)
|
|
processed.append(x)
|
|
else:
|
|
processed = self._format_lun_id(lun_ids)
|
|
return processed
|
|
|
|
def _format_lun_id(self, lun_id):
|
|
# make sure lun_id is an int
|
|
lun_id = int(lun_id)
|
|
if lun_id < 256:
|
|
return lun_id
|
|
else:
|
|
return ("0x%04x%04x00000000" %
|
|
(lun_id & 0xffff, lun_id >> 16 & 0xffff))
|
|
|
|
def get_hctl(self, session, lun):
|
|
"""Given an iSCSI session return the host, channel, target, and lun."""
|
|
glob_str = '/sys/class/iscsi_host/host*/device/session' + session
|
|
paths = glob.glob(glob_str + '/target*')
|
|
if paths:
|
|
__, channel, target = os.path.split(paths[0])[1].split(':')
|
|
# Check if we can get the host
|
|
else:
|
|
target = channel = '-'
|
|
paths = glob.glob(glob_str)
|
|
|
|
if not paths:
|
|
LOG.debug('No hctl found on session %s with lun %s', session, lun)
|
|
return None
|
|
|
|
# Extract the host number from the path
|
|
host = paths[0][26:paths[0].index('/', 26)]
|
|
res = (host, channel, target, lun)
|
|
LOG.debug('HCTL %s found on session %s with lun %s', res, session, lun)
|
|
return res
|
|
|
|
def device_name_by_hctl(self, session, hctl):
|
|
"""Find the device name given a session and the hctl.
|
|
|
|
:param session: A string with the session number
|
|
"param hctl: An iterable with the host, channel, target, and lun as
|
|
passed to scan. ie: ('5', '-', '-', '0')
|
|
"""
|
|
if '-' in hctl:
|
|
hctl = ['*' if x == '-' else x for x in hctl]
|
|
path = ('/sys/class/scsi_host/host%(h)s/device/session%(s)s/target'
|
|
'%(h)s:%(c)s:%(t)s/%(h)s:%(c)s:%(t)s:%(l)s/block/*' %
|
|
{'h': hctl[0], 'c': hctl[1], 't': hctl[2], 'l': hctl[3],
|
|
's': session})
|
|
# Sort devices and return the first so we don't return a partition
|
|
devices = sorted(glob.glob(path))
|
|
device = os.path.split(devices[0])[1] if devices else None
|
|
LOG.debug('Searching for a device in session %s and hctl %s yield: %s',
|
|
session, hctl, device)
|
|
return device
|
|
|
|
def scan_iscsi(self, host, channel='-', target='-', lun='-'):
|
|
"""Send an iSCSI scan request given the host and optionally the ctl."""
|
|
LOG.debug('Scanning host %(host)s c: %(channel)s, '
|
|
't: %(target)s, l: %(lun)s)',
|
|
{'host': host, 'channel': channel,
|
|
'target': target, 'lun': lun})
|
|
self.echo_scsi_command('/sys/class/scsi_host/host%s/scan' % host,
|
|
'%(c)s %(t)s %(l)s' % {'c': channel,
|
|
't': target,
|
|
'l': lun})
|
|
|
|
def multipath_add_wwid(self, wwid):
|
|
"""Add a wwid to the list of know multipath wwids.
|
|
|
|
This has the effect of multipathd being willing to create a dm for a
|
|
multipath even when there's only 1 device.
|
|
"""
|
|
out, err = self._execute('multipath', '-a', wwid,
|
|
run_as_root=True,
|
|
check_exit_code=False,
|
|
root_helper=self._root_helper)
|
|
return out.strip() == "wwid '" + wwid + "' added"
|
|
|
|
def multipath_add_path(self, realpath):
|
|
"""Add a path to multipathd for monitoring.
|
|
|
|
This has the effect of multipathd checking an already checked device
|
|
for multipath.
|
|
|
|
Together with `multipath_add_wwid` we can create a multipath when
|
|
there's only 1 path.
|
|
"""
|
|
stdout, stderr = self._execute('multipathd', 'add', 'path', realpath,
|
|
run_as_root=True, timeout=5,
|
|
check_exit_code=False,
|
|
root_helper=self._root_helper)
|
|
return stdout.strip() == 'ok'
|