8c53d87ad9
Import the oslo looping call implementation (which is a copy of nova's), delete nova's local copy, convert all users to the new location. It should be noted that the oslo implementation of FixedIntervalLoopingCall measures time from the start of the periodic task, not the end, so periodic tasks will run with a constant frequency instead of the frequency changing depending on how long the periodic task takes to run. Change-Id: Ia62ce1988f5373c09146efa6b3b1d1dc094d50c4
142 lines
4.5 KiB
Python
142 lines
4.5 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# (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 utilities."""
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from nova import exception
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from nova.openstack.common import log as logging
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from nova.openstack.common import loopingcall
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from nova import utils
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LOG = logging.getLogger(__name__)
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def echo_scsi_command(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, run_as_root=True)
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utils.execute('tee', *args, **kwargs)
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def rescan_hosts(hbas):
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for hba in hbas:
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echo_scsi_command("/sys/class/scsi_host/%s/scan"
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% hba['host_device'], "- - -")
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def get_device_list():
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(out, err) = utils.execute('sginfo', '-r', run_as_root=True)
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devices = []
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if out:
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line = out.strip()
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devices = line.split(" ")
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return devices
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def get_device_info(device):
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(out, err) = utils.execute('sg_scan', device, run_as_root=True)
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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 _wait_for_remove(device, tries):
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tries = tries + 1
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LOG.debug(_("Trying (%(tries)s) to remove device %(device)s")
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% {'tries': tries, 'device': device["device"]})
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path = "/sys/bus/scsi/drivers/sd/%s:%s:%s:%s/delete"
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echo_scsi_command(path % (device["host"], device["channel"],
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device["id"], device["lun"]),
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"1")
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devices = get_device_list()
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if device["device"] not in devices:
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raise loopingcall.LoopingCallDone()
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def remove_device(device):
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tries = 0
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timer = loopingcall.FixedIntervalLoopingCall(_wait_for_remove, device,
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tries)
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timer.start(interval=2).wait()
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timer.stop()
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def find_multipath_device(device):
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"""Try and discover the multipath device for a volume."""
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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) = utils.execute('multipath', '-l', device,
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run_as_root=True)
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except exception.ProcessExecutionError as exc:
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LOG.warn(_("Multipath call failed exit (%(code)s)")
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% {'code': exc.exit_code})
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return None
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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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if lines:
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line = lines[0]
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info = line.split(" ")
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# device line output is different depending
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# on /etc/multipath.conf settings.
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if info[1][:2] == "dm":
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mdev = "/dev/%s" % info[1]
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elif info[2][:2] == "dm":
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mdev = "/dev/%s" % info[2]
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if mdev is None:
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LOG.warn(_("Couldn't find multipath device %(line)s")
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% locals())
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return None
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LOG.debug(_("Found multipath device = %(mdev)s") % locals())
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device_lines = lines[3:]
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for dev_line in device_lines:
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dev_line = dev_line.strip()
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dev_line = dev_line[3:]
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dev_info = dev_line.split(" ")
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if dev_line.find("policy") != -1:
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address = dev_info[0].split(":")
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dev = {'device': '/dev/%s' % dev_info[1],
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'host': address[0], 'channel': address[1],
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'id': address[2], 'lun': address[3]
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}
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devices.append(dev)
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if mdev is not None:
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info = {"device": mdev,
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"devices": devices}
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return info
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return None
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