def _get_nvme_devices(self):
nvme_devices = []
# match nvme devices like /dev/nvme10n10
pattern = r'/dev/nvme[0-9]+n[0-9]+'
cmd = ['nvme', 'list']
for retry in range(1, self.device_scan_attempts + 1):
try:
(out, err) = self._execute(*cmd,
root_helper=self._root_helper,
run_as_root=True)
for line in out.split('\n'):
result = re.match(pattern, line)
if result:
nvme_devices.append(result.group(0))
LOG.debug("_get_nvme_devices returned %(nvme_devices)s",
{'nvme_devices': nvme_devices})
return nvme_devices
except putils.ProcessExecutionError:
LOG.warning(
"Failed to list available NVMe connected controllers, "
"retrying.")
time.sleep(retry**2)
else:
msg = _("Failed to retrieve available connected NVMe controllers "
"when running nvme list.")
raise exception.CommandExecutionFailed(message=msg)
def rescan(executor, target_nqn, vol_uuid):
ctr_device = (
NVMeOFConnector.get_search_path() +
NVMeOFConnector._get_nvme_controller(executor, target_nqn))
nvme_command = ('ns-rescan', ctr_device)
try:
NVMeOFConnector.run_nvme_cli(executor, nvme_command)
except Exception as e:
raise exception.CommandExecutionFailed(e, cmd=nvme_command)
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_str = out.strip()
lines = lines_str.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