9cf135c686
Previously linuxscsi.extend_volume would always attempt to wait for multipath devices to appear regardless of multipath actually being used by the connector. This change corrects this by passing down the existing use_multipath attribute from the iSCSI and FC connectors into linuxscsi.extend_volume. The same attribute is introduced to the NVMe connector to also allow it to skip this search for multipath devices. Change-Id: I29d65ae036957f3a63cba93dd330b14e3361a1b9 Closes-bug: #1832247
684 lines
28 KiB
Python
684 lines
28 KiB
Python
# (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 scsi subsystem and Multipath utilities.
|
|
|
|
Note, this is not iSCSI.
|
|
"""
|
|
import glob
|
|
import os
|
|
import re
|
|
import time
|
|
|
|
from oslo_concurrency import processutils as putils
|
|
from oslo_log import log as logging
|
|
import six
|
|
|
|
from os_brick import exception
|
|
from os_brick import executor
|
|
from os_brick.privileged import rootwrap as priv_rootwrap
|
|
from os_brick import utils
|
|
|
|
LOG = logging.getLogger(__name__)
|
|
|
|
MULTIPATH_ERROR_REGEX = re.compile(r"\w{3} \d+ \d\d:\d\d:\d\d \|.*$")
|
|
MULTIPATH_WWID_REGEX = re.compile(r"\((?P<wwid>.+)\)")
|
|
MULTIPATH_DEVICE_ACTIONS = ['unchanged:', 'reject:', 'reload:',
|
|
'switchpg:', 'rename:', 'create:',
|
|
'resize:']
|
|
|
|
|
|
class LinuxSCSI(executor.Executor):
|
|
# As found in drivers/scsi/scsi_lib.c
|
|
WWN_TYPES = {'t10.': '1', 'eui.': '2', 'naa.': '3'}
|
|
|
|
def echo_scsi_command(self, path, content):
|
|
"""Used to echo strings to scsi subsystem."""
|
|
|
|
args = ["-a", path]
|
|
kwargs = dict(process_input=content,
|
|
run_as_root=True,
|
|
root_helper=self._root_helper)
|
|
self._execute('tee', *args, **kwargs)
|
|
|
|
def get_name_from_path(self, path):
|
|
"""Translates /dev/disk/by-path/ entry to /dev/sdX."""
|
|
|
|
name = os.path.realpath(path)
|
|
if name.startswith("/dev/"):
|
|
return name
|
|
else:
|
|
return None
|
|
|
|
def remove_scsi_device(self, device, force=False, exc=None,
|
|
flush=True):
|
|
"""Removes a scsi device based upon /dev/sdX name."""
|
|
path = "/sys/block/%s/device/delete" % device.replace("/dev/", "")
|
|
if os.path.exists(path):
|
|
exc = exception.ExceptionChainer() if exc is None else exc
|
|
if flush:
|
|
# flush any outstanding IO first
|
|
with exc.context(force, 'Flushing %s failed', device):
|
|
self.flush_device_io(device)
|
|
|
|
LOG.debug("Remove SCSI device %(device)s with %(path)s",
|
|
{'device': device, 'path': path})
|
|
with exc.context(force, 'Removing %s failed', device):
|
|
self.echo_scsi_command(path, "1")
|
|
|
|
def wait_for_volumes_removal(self, volumes_names):
|
|
"""Wait for device paths to be removed from the system."""
|
|
str_names = ', '.join(volumes_names)
|
|
LOG.debug('Checking to see if SCSI volumes %s have been removed.',
|
|
str_names)
|
|
exist = ['/dev/' + volume_name for volume_name in volumes_names]
|
|
|
|
# It can take up to 30 seconds to remove a SCSI device if the path
|
|
# failed right before we start detaching, which is unlikely, but we
|
|
# still shouldn't fail in that case.
|
|
for i in range(61):
|
|
exist = [path for path in exist if os.path.exists(path)]
|
|
if not exist:
|
|
LOG.debug("SCSI volumes %s have been removed.", str_names)
|
|
return
|
|
# Don't sleep on the last try since we are quitting
|
|
if i < 60:
|
|
time.sleep(0.5)
|
|
# Log every 5 seconds
|
|
if i % 10 == 0:
|
|
LOG.debug('%s still exist.', ', '.join(exist))
|
|
raise exception.VolumePathNotRemoved(volume_path=exist)
|
|
|
|
def get_device_info(self, device):
|
|
(out, _err) = self._execute('sg_scan', device, run_as_root=True,
|
|
root_helper=self._root_helper)
|
|
dev_info = {'device': device, 'host': None,
|
|
'channel': None, 'id': None, 'lun': None}
|
|
if out:
|
|
line = out.strip()
|
|
line = line.replace(device + ": ", "")
|
|
info = line.split(" ")
|
|
|
|
for item in info:
|
|
if '=' in item:
|
|
pair = item.split('=')
|
|
dev_info[pair[0]] = pair[1]
|
|
elif 'scsi' in item:
|
|
dev_info['host'] = item.replace('scsi', '')
|
|
|
|
return dev_info
|
|
|
|
def get_sysfs_wwn(self, device_names):
|
|
"""Return the wwid from sysfs in any of devices in udev format."""
|
|
wwid = self.get_sysfs_wwid(device_names)
|
|
glob_str = '/dev/disk/by-id/scsi-'
|
|
wwn_paths = glob.glob(glob_str + '*')
|
|
# If we don't have multiple designators on page 0x83
|
|
if wwid and glob_str + wwid in wwn_paths:
|
|
return wwid
|
|
|
|
# If we have multiple designators follow the symlinks
|
|
for wwn_path in wwn_paths:
|
|
try:
|
|
if os.path.islink(wwn_path) and os.stat(wwn_path):
|
|
path = os.path.realpath(wwn_path)
|
|
if path.startswith('/dev/') and path[5:] in device_names:
|
|
return wwn_path[len(glob_str):]
|
|
except OSError:
|
|
continue
|
|
return ''
|
|
|
|
def get_sysfs_wwid(self, device_names):
|
|
"""Return the wwid from sysfs in any of devices in udev format."""
|
|
for device_name in device_names:
|
|
try:
|
|
with open('/sys/block/%s/device/wwid' % device_name) as f:
|
|
wwid = f.read().strip()
|
|
except IOError:
|
|
continue
|
|
# The sysfs wwid has the wwn type in string format as a prefix,
|
|
# but udev uses its numerical representation as returned by
|
|
# scsi_id's page 0x83, so we need to map it
|
|
udev_wwid = self.WWN_TYPES.get(wwid[:4], '8') + wwid[4:]
|
|
return udev_wwid
|
|
return ''
|
|
|
|
def get_scsi_wwn(self, path):
|
|
"""Read the WWN from page 0x83 value for a SCSI device."""
|
|
|
|
(out, _err) = self._execute('/lib/udev/scsi_id', '--page', '0x83',
|
|
'--whitelisted', path,
|
|
run_as_root=True,
|
|
root_helper=self._root_helper)
|
|
return out.strip()
|
|
|
|
@staticmethod
|
|
def is_multipath_running(enforce_multipath, root_helper, execute=None):
|
|
try:
|
|
if execute is None:
|
|
execute = priv_rootwrap.execute
|
|
cmd = ('multipathd', 'show', 'status')
|
|
out, _err = execute(*cmd, run_as_root=True,
|
|
root_helper=root_helper)
|
|
# There was a bug in multipathd where it didn't return an error
|
|
# code and just printed the error message in stdout.
|
|
if out and out.startswith('error receiving packet'):
|
|
raise putils.ProcessExecutionError('', out, 1, cmd, None)
|
|
except putils.ProcessExecutionError as err:
|
|
LOG.error('multipathd is not running: exit code %(err)s',
|
|
{'err': err.exit_code})
|
|
if enforce_multipath:
|
|
raise
|
|
return False
|
|
|
|
return True
|
|
|
|
def get_dm_name(self, dm):
|
|
"""Get the Device map name given the device name of the dm on sysfs.
|
|
|
|
:param dm: Device map name as seen in sysfs. ie: 'dm-0'
|
|
:returns: String with the name, or empty string if not available.
|
|
ie: '36e843b658476b7ed5bc1d4d10d9b1fde'
|
|
"""
|
|
try:
|
|
with open('/sys/block/' + dm + '/dm/name') as f:
|
|
return f.read().strip()
|
|
except IOError:
|
|
return ''
|
|
|
|
def find_sysfs_multipath_dm(self, device_names):
|
|
"""Find the dm device name given a list of device names
|
|
|
|
:param device_names: Iterable with device names, not paths. ie: ['sda']
|
|
:returns: String with the dm name or None if not found. ie: 'dm-0'
|
|
"""
|
|
glob_str = '/sys/block/%s/holders/dm-*'
|
|
for dev_name in device_names:
|
|
dms = glob.glob(glob_str % dev_name)
|
|
if dms:
|
|
__, device_name, __, dm = dms[0].rsplit('/', 3)
|
|
return dm
|
|
return None
|
|
|
|
@staticmethod
|
|
def get_dev_path(connection_properties, device_info):
|
|
"""Determine what path was used by Nova/Cinder to access volume."""
|
|
if device_info and device_info.get('path'):
|
|
return device_info.get('path')
|
|
|
|
return connection_properties.get('device_path') or ''
|
|
|
|
@staticmethod
|
|
def requires_flush(path, path_used, was_multipath):
|
|
"""Check if a device needs to be flushed when detaching.
|
|
|
|
A device representing a single path connection to a volume must only be
|
|
flushed if it has been used directly by Nova or Cinder to write data.
|
|
|
|
If the path has been used via a multipath DM or if the device was part
|
|
of a multipath but a different single path was used for I/O (instead of
|
|
the multipath) then we don't need to flush.
|
|
"""
|
|
# No used path happens on failed attachs, when we don't care about
|
|
# individual flushes.
|
|
# When Nova used a multipath we don't need to do individual flushes.
|
|
if not path_used or was_multipath:
|
|
return False
|
|
|
|
# We need to flush the single path that was used.
|
|
# For encrypted volumes the symlink has been replaced, so realpath
|
|
# won't return device under /dev but under /dev/disk/...
|
|
path = os.path.realpath(path)
|
|
path_used = os.path.realpath(path_used)
|
|
return path_used == path or '/dev' != os.path.split(path_used)[0]
|
|
|
|
def remove_connection(self, devices_names, is_multipath, force=False,
|
|
exc=None, path_used=None, was_multipath=False):
|
|
"""Remove LUNs and multipath associated with devices names.
|
|
|
|
:param devices_names: Iterable with real device names ('sda', 'sdb')
|
|
:param is_multipath: Whether this is a multipath connection or not
|
|
:param force: Whether to forcefully disconnect even if flush fails.
|
|
:param exc: ExceptionChainer where to add exceptions if forcing
|
|
:param path_used: What path was used by Nova/Cinder for I/O
|
|
:param was_multipath: If the path used for I/O was a multipath
|
|
:returns: Multipath device map name if found and not flushed
|
|
"""
|
|
if not devices_names:
|
|
return
|
|
multipath_name = None
|
|
exc = exception.ExceptionChainer() if exc is None else exc
|
|
LOG.debug('Removing %(type)s devices %(devices)s',
|
|
{'type': 'multipathed' if is_multipath else 'single pathed',
|
|
'devices': ', '.join(devices_names)})
|
|
|
|
if is_multipath:
|
|
multipath_dm = self.find_sysfs_multipath_dm(devices_names)
|
|
multipath_name = multipath_dm and self.get_dm_name(multipath_dm)
|
|
if multipath_name:
|
|
with exc.context(force, 'Flushing %s failed', multipath_name):
|
|
self.flush_multipath_device(multipath_name)
|
|
multipath_name = None
|
|
|
|
for device_name in devices_names:
|
|
dev_path = '/dev/' + device_name
|
|
flush = self.requires_flush(dev_path, path_used, was_multipath)
|
|
self.remove_scsi_device(dev_path, force, exc, flush)
|
|
|
|
# Wait until the symlinks are removed
|
|
with exc.context(force, 'Some devices remain from %s', devices_names):
|
|
try:
|
|
self.wait_for_volumes_removal(devices_names)
|
|
finally:
|
|
# Since we use /dev/disk/by-id/scsi- links to get the wwn we
|
|
# must ensure they are always removed.
|
|
self._remove_scsi_symlinks(devices_names)
|
|
return multipath_name
|
|
|
|
def _remove_scsi_symlinks(self, devices_names):
|
|
devices = ['/dev/' + dev for dev in devices_names]
|
|
links = glob.glob('/dev/disk/by-id/scsi-*')
|
|
unlink = []
|
|
for link in links:
|
|
try:
|
|
if os.path.realpath(link) in devices:
|
|
unlink.append(link)
|
|
except OSError:
|
|
# A race condition in Python's posixpath:realpath just occurred
|
|
# so we can ignore it because the file was just removed between
|
|
# a check if file exists and a call to os.readlink
|
|
continue
|
|
|
|
if unlink:
|
|
priv_rootwrap.unlink_root(no_errors=True, *unlink)
|
|
|
|
def flush_device_io(self, device):
|
|
"""This is used to flush any remaining IO in the buffers."""
|
|
if os.path.exists(device):
|
|
try:
|
|
# NOTE(geguileo): With 30% connection error rates flush can get
|
|
# stuck, set timeout to prevent it from hanging here forever.
|
|
# Retry twice after 20 and 40 seconds.
|
|
LOG.debug("Flushing IO for device %s", device)
|
|
self._execute('blockdev', '--flushbufs', device,
|
|
run_as_root=True, attempts=3, timeout=300,
|
|
interval=10, root_helper=self._root_helper)
|
|
except putils.ProcessExecutionError as exc:
|
|
LOG.warning("Failed to flush IO buffers prior to removing "
|
|
"device: %(code)s", {'code': exc.exit_code})
|
|
raise
|
|
|
|
def flush_multipath_device(self, device_map_name):
|
|
LOG.debug("Flush multipath device %s", device_map_name)
|
|
# NOTE(geguileo): With 30% connection error rates flush can get stuck,
|
|
# set timeout to prevent it from hanging here forever. Retry twice
|
|
# after 20 and 40 seconds.
|
|
self._execute('multipath', '-f', device_map_name, run_as_root=True,
|
|
attempts=3, timeout=300, interval=10,
|
|
root_helper=self._root_helper)
|
|
|
|
@utils.retry(exceptions=exception.VolumeDeviceNotFound)
|
|
def wait_for_path(self, volume_path):
|
|
"""Wait for a path to show up."""
|
|
LOG.debug("Checking to see if %s exists yet.",
|
|
volume_path)
|
|
if not os.path.exists(volume_path):
|
|
LOG.debug("%(path)s doesn't exists yet.", {'path': volume_path})
|
|
raise exception.VolumeDeviceNotFound(
|
|
device=volume_path)
|
|
else:
|
|
LOG.debug("%s has shown up.", volume_path)
|
|
|
|
@utils.retry(exceptions=exception.BlockDeviceReadOnly, retries=5)
|
|
def wait_for_rw(self, wwn, device_path):
|
|
"""Wait for block device to be Read-Write."""
|
|
LOG.debug("Checking to see if %s is read-only.",
|
|
device_path)
|
|
out, info = self._execute('lsblk', '-o', 'NAME,RO', '-l', '-n')
|
|
LOG.debug("lsblk output: %s", out)
|
|
blkdevs = out.splitlines()
|
|
for blkdev in blkdevs:
|
|
# Entries might look like:
|
|
#
|
|
# "3624a93709a738ed78583fd120013902b (dm-1) 1"
|
|
#
|
|
# or
|
|
#
|
|
# "sdd 0"
|
|
#
|
|
# We are looking for the first and last part of them. For FC
|
|
# multipath devices the name is in the format of '<WWN> (dm-<ID>)'
|
|
blkdev_parts = blkdev.split(' ')
|
|
ro = blkdev_parts[-1]
|
|
name = blkdev_parts[0]
|
|
|
|
# We must validate that all pieces of the dm-# device are rw,
|
|
# if some are still ro it can cause problems.
|
|
if wwn in name and int(ro) == 1:
|
|
LOG.debug("Block device %s is read-only", device_path)
|
|
self._execute('multipath', '-r', check_exit_code=[0, 1, 21],
|
|
run_as_root=True, root_helper=self._root_helper)
|
|
raise exception.BlockDeviceReadOnly(
|
|
device=device_path)
|
|
else:
|
|
LOG.debug("Block device %s is not read-only.", device_path)
|
|
|
|
def find_multipath_device_path(self, wwn):
|
|
"""Look for the multipath device file for a volume WWN.
|
|
|
|
Multipath devices can show up in several places on
|
|
a linux system.
|
|
|
|
1) When multipath friendly names are ON:
|
|
a device file will show up in
|
|
/dev/disk/by-id/dm-uuid-mpath-<WWN>
|
|
/dev/disk/by-id/dm-name-mpath<N>
|
|
/dev/disk/by-id/scsi-mpath<N>
|
|
/dev/mapper/mpath<N>
|
|
|
|
2) When multipath friendly names are OFF:
|
|
/dev/disk/by-id/dm-uuid-mpath-<WWN>
|
|
/dev/disk/by-id/scsi-<WWN>
|
|
/dev/mapper/<WWN>
|
|
|
|
"""
|
|
LOG.info("Find Multipath device file for volume WWN %(wwn)s",
|
|
{'wwn': wwn})
|
|
# First look for the common path
|
|
wwn_dict = {'wwn': wwn}
|
|
path = "/dev/disk/by-id/dm-uuid-mpath-%(wwn)s" % wwn_dict
|
|
try:
|
|
self.wait_for_path(path)
|
|
return path
|
|
except exception.VolumeDeviceNotFound:
|
|
pass
|
|
|
|
# for some reason the common path wasn't found
|
|
# lets try the dev mapper path
|
|
path = "/dev/mapper/%(wwn)s" % wwn_dict
|
|
try:
|
|
self.wait_for_path(path)
|
|
return path
|
|
except exception.VolumeDeviceNotFound:
|
|
pass
|
|
|
|
# couldn't find a path
|
|
LOG.warning("couldn't find a valid multipath device path for "
|
|
"%(wwn)s", wwn_dict)
|
|
return None
|
|
|
|
def find_multipath_device(self, device):
|
|
"""Discover multipath devices for a mpath device.
|
|
|
|
This uses the slow multipath -l command to find a
|
|
multipath device description, then screen scrapes
|
|
the output to discover the multipath device name
|
|
and it's devices.
|
|
|
|
"""
|
|
|
|
mdev = None
|
|
devices = []
|
|
out = None
|
|
try:
|
|
(out, _err) = self._execute('multipath', '-l', device,
|
|
run_as_root=True,
|
|
root_helper=self._root_helper)
|
|
except putils.ProcessExecutionError as exc:
|
|
LOG.warning("multipath call failed exit %(code)s",
|
|
{'code': exc.exit_code})
|
|
raise exception.CommandExecutionFailed(
|
|
cmd='multipath -l %s' % device)
|
|
|
|
if out:
|
|
lines = out.strip()
|
|
lines = lines.split("\n")
|
|
lines = [line for line in lines
|
|
if not re.match(MULTIPATH_ERROR_REGEX, line) and
|
|
len(line)]
|
|
if lines:
|
|
|
|
mdev_name = lines[0].split(" ")[0]
|
|
|
|
if mdev_name in MULTIPATH_DEVICE_ACTIONS:
|
|
mdev_name = lines[0].split(" ")[1]
|
|
|
|
mdev = '/dev/mapper/%s' % mdev_name
|
|
|
|
# Confirm that the device is present.
|
|
try:
|
|
os.stat(mdev)
|
|
except OSError:
|
|
LOG.warning("Couldn't find multipath device %s",
|
|
mdev)
|
|
return None
|
|
|
|
wwid_search = MULTIPATH_WWID_REGEX.search(lines[0])
|
|
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, use_multipath=False):
|
|
"""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])
|
|
if use_multipath:
|
|
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'
|