content: //
  // Licensed to the Apache Software Foundation (ASF) under one
  // or more contributor license agreements.  See the NOTICE file
  // distributed with this work for additional information
  // regarding copyright ownership.  The ASF licenses this file
  // to you 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.
  //
  
  package com.cloud.hypervisor.kvm.resource.wrapper;
  
  
  import com.cloud.agent.api.storage.ResizeVolumeAnswer;
  import com.cloud.agent.api.storage.StorPoolResizeVolumeCommand;
  import com.cloud.agent.api.to.StorageFilerTO;
  import com.cloud.hypervisor.kvm.resource.LibvirtComputingResource;
  import com.cloud.hypervisor.kvm.storage.KVMPhysicalDisk;
  import com.cloud.hypervisor.kvm.storage.KVMStoragePool;
  import com.cloud.hypervisor.kvm.storage.KVMStoragePoolManager;
  import com.cloud.hypervisor.kvm.storage.StorPoolStorageAdaptor;
  import com.cloud.resource.CommandWrapper;
  import com.cloud.resource.ResourceWrapper;
  import com.cloud.utils.script.Script;
  
  
  @ResourceWrapper(handles = StorPoolResizeVolumeCommand.class)
  public final class StorPoolResizeVolumeCommandWrapper extends CommandWrapper<StorPoolResizeVolumeCommand, ResizeVolumeAnswer, LibvirtComputingResource> {
  
  
      @Override
      public ResizeVolumeAnswer execute(final StorPoolResizeVolumeCommand command, final LibvirtComputingResource libvirtComputingResource) {
          final String volid = command.getPath();
          final long newSize = command.getNewSize();
          final long currentSize = command.getCurrentSize();
          final String vmInstanceName = command.getInstanceName();
          final boolean shrinkOk = command.getShrinkOk();
          final StorageFilerTO spool = command.getPool();
          String volPath = null;
  
          if (currentSize == newSize) {
              // nothing to do
              logger.info("No need to resize volume: current size " + currentSize + " is same as new size " + newSize);
              return new ResizeVolumeAnswer(command, true, "success", currentSize);
          }
  
          try {
              final KVMStoragePoolManager storagePoolMgr = libvirtComputingResource.getStoragePoolMgr();
              KVMStoragePool pool = storagePoolMgr.getStoragePool(spool.getType(), spool.getUuid());
  
              final KVMPhysicalDisk vol = pool.getPhysicalDisk(volid);
              final String path = vol.getPath();
              volPath = path;
              if (!command.isAttached()) {
                  StorPoolStorageAdaptor.attachOrDetachVolume("attach", "volume", path);
              }
              final Script resizecmd = new Script(libvirtComputingResource.getResizeVolumePath(), libvirtComputingResource.getCmdsTimeout(), logger);
              resizecmd.add("-s", String.valueOf(newSize));
              resizecmd.add("-c", String.valueOf(currentSize));
              resizecmd.add("-p", path);
              resizecmd.add("-t", "NOTIFYONLY");
              resizecmd.add("-r", String.valueOf(shrinkOk));
              resizecmd.add("-v", vmInstanceName);
              final String result = resizecmd.execute();
  
              if (result != null) {
                  return new ResizeVolumeAnswer(command, true, "Resize succeeded, but need reboot to notify guest");
              }
  
              /* fetch new size as seen from libvirt, don't want to assume anything */
              pool = storagePoolMgr.getStoragePool(spool.getType(), spool.getUuid());
              pool.refresh();
  
              final long finalSize = pool.getPhysicalDisk(volid).getVirtualSize();
              logger.debug("after resize, size reports as " + finalSize + ", requested " + newSize);
              return new ResizeVolumeAnswer(command, true, "success", finalSize);
          } catch (final Exception e) {
              final String error = "Failed to resize volume: " + e.getMessage();
              logger.debug(error);
              return new ResizeVolumeAnswer(command, false, error);
          } finally {
              if (!command.isAttached() && volPath != null) {
                  StorPoolStorageAdaptor.attachOrDetachVolume("detach", "volume", volPath);
              }
          }
      }
  }
  