Volume discovery and local storage management lib
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
 
 
os-brick/os_brick/initiator/connectors/rbd.py

214 lines
8.1 KiB

# All Rights Reserved.
#
# 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.
import os
import tempfile
from oslo_concurrency import processutils as putils
from oslo_log import log as logging
from oslo_utils import fileutils
from oslo_utils import netutils
from os_brick.i18n import _, _LE
from os_brick import exception
from os_brick import initiator
from os_brick.initiator.connectors import base
from os_brick.initiator import linuxrbd
from os_brick import utils
LOG = logging.getLogger(__name__)
class RBDConnector(base.BaseLinuxConnector):
""""Connector class to attach/detach RBD volumes."""
def __init__(self, root_helper, driver=None, use_multipath=False,
device_scan_attempts=initiator.DEVICE_SCAN_ATTEMPTS_DEFAULT,
*args, **kwargs):
super(RBDConnector, self).__init__(root_helper, driver=driver,
device_scan_attempts=
device_scan_attempts,
*args, **kwargs)
self.do_local_attach = kwargs.get('do_local_attach', False)
@staticmethod
def get_connector_properties(root_helper, *args, **kwargs):
"""The RBD connector properties."""
return {'do_local_attach': kwargs.get('do_local_attach', False)}
def get_volume_paths(self, connection_properties):
# TODO(e0ne): Implement this for local volume.
return []
def get_search_path(self):
# TODO(walter-boring): don't know where the connector
# looks for RBD volumes.
return None
def get_all_available_volumes(self, connection_properties=None):
# TODO(e0ne): Implement this for local volume.
return []
def _sanitize_mon_hosts(self, hosts):
def _sanitize_host(host):
if netutils.is_valid_ipv6(host):
host = '[%s]' % host
return host
return list(map(_sanitize_host, hosts))
def _create_ceph_conf(self, monitor_ips, monitor_ports,
cluster_name, user, keyring_path):
monitors = ["%s:%s" % (ip, port) for ip, port in
zip(self._sanitize_mon_hosts(monitor_ips), monitor_ports)]
mon_hosts = "mon_host = %s" % (','.join(monitors))
client_section = "[client.%s]" % user
if keyring_path is None:
keyring = ("keyring = /etc/ceph/%s.client.%s.keyring" %
(cluster_name, user))
else:
keyring = "keyring = %s" % keyring_path
try:
fd, ceph_conf_path = tempfile.mkstemp(prefix="brickrbd_")
with os.fdopen(fd, 'w') as conf_file:
conf_file.writelines([mon_hosts, "\n",
client_section, "\n", keyring])
return ceph_conf_path
except IOError:
msg = (_("Failed to write data to %s.") % (ceph_conf_path))
raise exception.BrickException(msg=msg)
def _get_rbd_handle(self, connection_properties):
try:
user = connection_properties['auth_username']
pool, volume = connection_properties['name'].split('/')
cluster_name = connection_properties.get('cluster_name')
monitor_ips = connection_properties.get('hosts')
monitor_ports = connection_properties.get('ports')
keyring_path = connection_properties.get('keyring')
except IndexError:
msg = _("Connect volume failed, malformed connection properties")
raise exception.BrickException(msg=msg)
conf = self._create_ceph_conf(monitor_ips, monitor_ports,
str(cluster_name), user,
keyring_path)
try:
rbd_client = linuxrbd.RBDClient(user, pool, conffile=conf,
rbd_cluster_name=str(cluster_name))
rbd_volume = linuxrbd.RBDVolume(rbd_client, volume)
rbd_handle = linuxrbd.RBDVolumeIOWrapper(
linuxrbd.RBDImageMetadata(rbd_volume, pool, user, conf))
finally:
fileutils.delete_if_exists(conf)
return rbd_handle
@staticmethod
def get_rbd_device_name(pool, volume):
"""Return device name which will be generated by RBD kernel module.
:param pool: RBD pool name.
:type pool: string
:param volume: RBD image name.
:type volume: string
"""
return '/dev/rbd/{pool}/{volume}'.format(pool=pool, volume=volume)
@utils.trace
def connect_volume(self, connection_properties):
"""Connect to a volume.
:param connection_properties: The dictionary that describes all
of the target volume attributes.
:type connection_properties: dict
:returns: dict
"""
do_local_attach = connection_properties.get('do_local_attach',
self.do_local_attach)
if do_local_attach:
# NOTE(e0ne): sanity check if ceph-common is installed.
cmd = ['which', 'rbd']
try:
self._execute(*cmd)
except putils.ProcessExecutionError:
msg = _("ceph-common package is not installed.")
LOG.error(msg)
raise exception.BrickException(message=msg)
# NOTE(e0ne): map volume to a block device
# via the rbd kernel module.
pool, volume = connection_properties['name'].split('/')
cmd = ['rbd', 'map', volume, '--pool', pool]
self._execute(*cmd, root_helper=self._root_helper,
run_as_root=True)
return {'path': RBDConnector.get_rbd_device_name(pool, volume),
'type': 'block'}
rbd_handle = self._get_rbd_handle(connection_properties)
return {'path': rbd_handle}
@utils.trace
def disconnect_volume(self, connection_properties, device_info):
"""Disconnect a volume.
:param connection_properties: The dictionary that describes all
of the target volume attributes.
:type connection_properties: dict
:param device_info: historical difference, but same as connection_props
:type device_info: dict
"""
do_local_attach = connection_properties.get('do_local_attach',
self.do_local_attach)
if do_local_attach:
pool, volume = connection_properties['name'].split('/')
dev_name = RBDConnector.get_rbd_device_name(pool, volume)
cmd = ['rbd', 'unmap', dev_name]
self._execute(*cmd, root_helper=self._root_helper,
run_as_root=True)
else:
if device_info:
rbd_handle = device_info.get('path', None)
if rbd_handle is not None:
rbd_handle.close()
def check_valid_device(self, path, run_as_root=True):
"""Verify an existing RBD handle is connected and valid."""
rbd_handle = path
if rbd_handle is None:
return False
original_offset = rbd_handle.tell()
try:
rbd_handle.read(4096)
except Exception as e:
LOG.error(_LE("Failed to access RBD device handle: %(error)s"),
{"error": e})
return False
finally:
rbd_handle.seek(original_offset, 0)
return True
def extend_volume(self, connection_properties):
# TODO(walter-boring): is this possible?
raise NotImplementedError