143 lines
4.5 KiB
Python
143 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.openstack.common import log as logging
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from nova.openstack.common import loopingcall
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from nova.openstack.common import processutils
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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 processutils.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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