144 lines
5.8 KiB
Python
144 lines
5.8 KiB
Python
# Copyright (c) 2016 Mirantis, Inc.
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# All Rights Reserved.
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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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import os
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import re
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from oslo_config import cfg
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from oslo_log import log
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from manila import exception
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from manila.i18n import _
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from manila.share import driver
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CONF = cfg.CONF
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lv_opts = [
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cfg.StrOpt("container_volume_group",
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default="manila_docker_volumes",
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help="LVM volume group to use for volumes. This volume group "
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"must be created by the cloud administrator independently "
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"from manila operations."),
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]
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CONF.register_opts(lv_opts)
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LOG = log.getLogger(__name__)
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class LVMHelper(driver.ExecuteMixin):
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def __init__(self, *args, **kwargs):
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self.configuration = kwargs.pop("configuration", None)
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if self.configuration is None:
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raise exception.ManilaException(_("LVMHelper called without "
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"supplying configuration."))
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self.configuration.append_config_values(lv_opts)
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super(LVMHelper, self).__init__(*args, **kwargs)
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self.init_execute_mixin()
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def get_share_server_pools(self, share_server=None):
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out, err = self._execute('vgs',
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self.configuration.container_volume_group,
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'--options', 'vg_size,vg_free',
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'--noheadings',
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'--units', 'g',
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run_as_root=True)
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if err:
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msg = _("Unable to gather size of the volume group %(vg)s to be "
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"used by the driver. Error: %(err)s")
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raise exception.ShareBackendException(
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msg % {'vg': self.configuration.container_volume_group,
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'err': err})
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(free_size, total_size) = sorted(re.findall("\d+\.\d+|\d+", out),
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reverse=False)
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return [{
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'pool_name': self.configuration.container_volume_group,
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'total_capacity_gb': float(total_size),
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'free_capacity_gb': float(free_size),
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'reserved_percentage': 0,
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}, ]
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def _get_lv_device(self, share_name):
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return os.path.join("/dev", self.configuration.container_volume_group,
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share_name)
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def _get_lv_folder(self, share_name):
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# Provides folder name in hosts /tmp to which logical volume is
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# mounted prior to providing access to it from a container.
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return os.path.join("/tmp/shares", share_name)
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def provide_storage(self, share_name, size):
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self._execute("lvcreate", "-p", "rw", "-L",
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str(size) + "G", "-n", share_name,
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self.configuration.container_volume_group,
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run_as_root=True)
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self._execute("mkfs.ext4", self._get_lv_device(share_name),
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run_as_root=True)
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def _try_to_unmount_device(self, device):
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# NOTE(ganso): We invoke this method to be sure volume was unmounted,
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# and we swallow the exception in case it fails to.
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try:
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self._execute("umount", device, run_as_root=True)
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except exception.ProcessExecutionError as e:
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LOG.warning("Failed to umount helper directory %(device)s due to "
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"%(reason)s.", {'device': device, 'reason': e})
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def remove_storage(self, share_name):
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device = self._get_lv_device(share_name)
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self._try_to_unmount_device(device)
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# (aovchinnikov): bug 1621784 manifests itself in jamming logical
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# volumes, so try removing once and issue warning until it is fixed.
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try:
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self._execute("lvremove", "-f", "--autobackup", "n",
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device, run_as_root=True)
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except exception.ProcessExecutionError as e:
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LOG.warning("Failed to remove logical volume %(device)s due to "
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"%(reason)s.", {'device': device, 'reason': e})
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def rename_storage(self, share_name, new_share_name):
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old_device = self._get_lv_device(share_name)
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new_device = self._get_lv_device(new_share_name)
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self._try_to_unmount_device(old_device)
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try:
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self._execute("lvrename", "--autobackup", "n",
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old_device, new_device, run_as_root=True)
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except exception.ProcessExecutionError as e:
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msg = ("Failed to rename logical volume %(device)s due to "
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"%(reason)s." % {'device': old_device, 'reason': e})
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LOG.exception(msg)
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raise
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def extend_share(self, share_name, new_size, share_server=None):
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lv_device = self._get_lv_device(share_name)
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cmd = ('lvextend', '-L', '%sG' % new_size, '-n', lv_device)
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self._execute(*cmd, run_as_root=True)
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self._execute("e2fsck", "-f", "-y", lv_device, run_as_root=True)
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self._execute('resize2fs', lv_device, run_as_root=True)
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def get_size(self, share_name):
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device = self._get_lv_device(share_name)
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size = self._execute(
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"lvs", "-o", "lv_size", "--noheadings", "--nosuffix",
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"--units", "g", device, run_as_root=True)
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LOG.debug("Found size %(size)s for LVM device "
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"%(lvm)s.", {'size': size[0], 'lvm': share_name})
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return size[0]
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