winterhazel commented on code in PR #10632: URL: https://github.com/apache/cloudstack/pull/10632#discussion_r2192918409
########## engine/storage/snapshot/src/main/java/org/apache/cloudstack/storage/vmsnapshot/KvmFileBasedStorageVmSnapshotStrategy.java: ########## @@ -0,0 +1,689 @@ +/* + * 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 org.apache.cloudstack.storage.vmsnapshot; + +import com.cloud.agent.api.Answer; +import com.cloud.agent.api.VMSnapshotTO; +import com.cloud.agent.api.storage.CreateDiskOnlyVmSnapshotAnswer; +import com.cloud.agent.api.storage.CreateDiskOnlyVmSnapshotCommand; +import com.cloud.agent.api.storage.DeleteDiskOnlyVmSnapshotCommand; +import com.cloud.agent.api.storage.MergeDiskOnlyVmSnapshotCommand; +import com.cloud.agent.api.storage.RevertDiskOnlyVmSnapshotAnswer; +import com.cloud.agent.api.storage.RevertDiskOnlyVmSnapshotCommand; +import com.cloud.agent.api.storage.SnapshotMergeTreeTO; +import com.cloud.agent.api.to.DataTO; +import com.cloud.configuration.Resource; +import com.cloud.event.EventTypes; +import com.cloud.event.UsageEventUtils; +import com.cloud.hypervisor.Hypervisor; +import com.cloud.storage.DataStoreRole; +import com.cloud.storage.Snapshot; +import com.cloud.storage.SnapshotVO; +import com.cloud.storage.Storage; +import com.cloud.storage.Volume; +import com.cloud.storage.VolumeVO; +import com.cloud.user.ResourceLimitService; +import com.cloud.uservm.UserVm; +import com.cloud.utils.DateUtil; +import com.cloud.utils.Pair; +import com.cloud.utils.exception.CloudRuntimeException; +import com.cloud.utils.fsm.NoTransitionException; +import com.cloud.vm.UserVmVO; +import com.cloud.vm.VirtualMachine; +import com.cloud.vm.snapshot.VMSnapshot; +import com.cloud.vm.snapshot.VMSnapshotDetailsVO; +import com.cloud.vm.snapshot.VMSnapshotVO; +import org.apache.cloudstack.backup.BackupOfferingVO; +import org.apache.cloudstack.backup.dao.BackupOfferingDao; +import org.apache.cloudstack.engine.subsystem.api.storage.ObjectInDataStoreStateMachine; +import org.apache.cloudstack.engine.subsystem.api.storage.SnapshotInfo; +import org.apache.cloudstack.engine.subsystem.api.storage.StrategyPriority; +import org.apache.cloudstack.engine.subsystem.api.storage.VMSnapshotOptions; +import org.apache.cloudstack.engine.subsystem.api.storage.VolumeInfo; +import org.apache.cloudstack.storage.datastore.db.SnapshotDataStoreDao; +import org.apache.cloudstack.storage.datastore.db.SnapshotDataStoreVO; +import org.apache.cloudstack.storage.datastore.db.StoragePoolVO; +import org.apache.cloudstack.storage.snapshot.SnapshotObject; +import org.apache.cloudstack.storage.to.SnapshotObjectTO; +import org.apache.cloudstack.storage.to.VolumeObjectTO; +import org.apache.commons.collections.CollectionUtils; + +import javax.inject.Inject; +import java.util.ArrayList; +import java.util.HashMap; +import java.util.List; +import java.util.Map; +import java.util.NoSuchElementException; +import java.util.Objects; +import java.util.stream.Collectors; + +public class KvmFileBasedStorageVmSnapshotStrategy extends StorageVMSnapshotStrategy { + + private static final List<Storage.StoragePoolType> supportedStoragePoolTypes = List.of(Storage.StoragePoolType.Filesystem, Storage.StoragePoolType.NetworkFilesystem, Storage.StoragePoolType.SharedMountPoint); + + @Inject + protected SnapshotDataStoreDao snapshotDataStoreDao; + + @Inject + protected ResourceLimitService resourceLimitManager; + + @Inject + protected BackupOfferingDao backupOfferingDao; + + @Override + public VMSnapshot takeVMSnapshot(VMSnapshot vmSnapshot) { + Map<VolumeInfo, SnapshotObject> volumeInfoToSnapshotObjectMap = new HashMap<>(); + try { + return takeVmSnapshotInternal(vmSnapshot, volumeInfoToSnapshotObjectMap); + } catch (CloudRuntimeException | NullPointerException | NoTransitionException ex) { + for (VolumeInfo volumeInfo : volumeInfoToSnapshotObjectMap.keySet()) { + volumeInfo.stateTransit(Volume.Event.OperationFailed); + SnapshotObject snapshot = volumeInfoToSnapshotObjectMap.get(volumeInfo); + try { + snapshot.processEvent(Snapshot.Event.OperationFailed); + } catch (NoTransitionException e) { + logger.error("Failed to change snapshot [{}] state due to [{}].", snapshot.getUuid(), e.getMessage(), e); + } + snapshot.processEvent(ObjectInDataStoreStateMachine.Event.OperationFailed); + } + try { + vmSnapshotHelper.vmSnapshotStateTransitTo(vmSnapshot, VMSnapshot.Event.OperationFailed); + } catch (NoTransitionException e) { + throw new CloudRuntimeException(e); + } + throw new CloudRuntimeException(ex); + } + } + + @Override + public boolean deleteVMSnapshot(VMSnapshot vmSnapshot) { + logger.info("Starting VM snapshot delete process for snapshot [{}].", vmSnapshot.getUuid()); + UserVmVO userVm = userVmDao.findById(vmSnapshot.getVmId()); + VMSnapshotVO vmSnapshotBeingDeleted = (VMSnapshotVO) vmSnapshot; + Long hostId = vmSnapshotHelper.pickRunningHost(vmSnapshotBeingDeleted.getVmId()); + long virtualSize = 0; + boolean isCurrent = vmSnapshotBeingDeleted.getCurrent(); + + transitStateWithoutThrow(vmSnapshotBeingDeleted, VMSnapshot.Event.ExpungeRequested); + + List<VolumeObjectTO> volumeTOs = vmSnapshotHelper.getVolumeTOList(vmSnapshotBeingDeleted.getVmId()); + List<VMSnapshotVO> snapshotChildren = vmSnapshotDao.listByParentAndStateIn(vmSnapshotBeingDeleted.getId(), VMSnapshot.State.Ready, VMSnapshot.State.Hidden); + + long realSize = getVMSnapshotRealSize(vmSnapshotBeingDeleted); + int numberOfChildren = snapshotChildren.size(); + + List<SnapshotVO> volumeSnapshotVos = new ArrayList<>(); + if (isCurrent && numberOfChildren == 0) { + volumeSnapshotVos = mergeCurrentDeltaOnSnapshot(vmSnapshotBeingDeleted, userVm, hostId, volumeTOs); + } else if (numberOfChildren == 0) { + logger.debug("Deleting VM snapshot [{}] as no snapshots/volumes depend on it.", vmSnapshot.getUuid()); + volumeSnapshotVos = deleteSnapshot(vmSnapshotBeingDeleted, hostId); + mergeOldSiblingWithOldParentIfOldParentIsDead(vmSnapshotDao.findByIdIncludingRemoved(vmSnapshotBeingDeleted.getParent()), userVm, hostId, volumeTOs); + } else if (!isCurrent && numberOfChildren == 1) { + VMSnapshotVO childSnapshot = snapshotChildren.get(0); + volumeSnapshotVos = mergeSnapshots(vmSnapshotBeingDeleted, childSnapshot, userVm, volumeTOs, hostId); + } + + for (SnapshotVO snapshotVO : volumeSnapshotVos) { + snapshotVO.setState(Snapshot.State.Destroyed); + snapshotDao.update(snapshotVO.getId(), snapshotVO); + } + + for (VolumeObjectTO volumeTo : volumeTOs) { + publishUsageEvent(EventTypes.EVENT_VM_SNAPSHOT_DELETE, vmSnapshotBeingDeleted, userVm, volumeTo); + virtualSize += volumeTo.getSize(); + } + + publishUsageEvent(EventTypes.EVENT_VM_SNAPSHOT_OFF_PRIMARY, vmSnapshotBeingDeleted, userVm, realSize, virtualSize); + + if (numberOfChildren > 1 || (isCurrent && numberOfChildren == 1)) { + transitStateWithoutThrow(vmSnapshotBeingDeleted, VMSnapshot.Event.Hide); + return true; + } + + transitStateWithoutThrow(vmSnapshotBeingDeleted, VMSnapshot.Event.OperationSucceeded); + + vmSnapshotDetailsDao.removeDetails(vmSnapshotBeingDeleted.getId()); + + vmSnapshotBeingDeleted.setRemoved(DateUtil.now()); + vmSnapshotDao.update(vmSnapshotBeingDeleted.getId(), vmSnapshotBeingDeleted); + + return true; + } + + @Override + public boolean revertVMSnapshot(VMSnapshot vmSnapshot) { + UserVmVO userVm = userVmDao.findById(vmSnapshot.getVmId()); + if (!userVm.getState().equals(VirtualMachine.State.Stopped)) { + throw new CloudRuntimeException("VM must be stopped to revert disk-only VM snapshot."); + } + + VMSnapshotVO vmSnapshotBeingReverted = (VMSnapshotVO) vmSnapshot; + Long hostId = vmSnapshotHelper.pickRunningHost(vmSnapshotBeingReverted.getVmId()); + + transitStateWithoutThrow(vmSnapshotBeingReverted, VMSnapshot.Event.RevertRequested); + + List<SnapshotDataStoreVO> volumeSnapshots = getVolumeSnapshotsAssociatedWithVmSnapshot(vmSnapshotBeingReverted); + List<SnapshotObjectTO> volumeSnapshotTos = volumeSnapshots.stream() + .map(snapshot -> (SnapshotObjectTO) snapshotDataFactory.getSnapshot(snapshot.getSnapshotId(), snapshot.getDataStoreId(), DataStoreRole.Primary).getTO()) + .collect(Collectors.toList()); + + RevertDiskOnlyVmSnapshotCommand revertDiskOnlyVMSnapshotCommand = new RevertDiskOnlyVmSnapshotCommand(volumeSnapshotTos, userVm.getName()); + Answer answer = agentMgr.easySend(hostId, revertDiskOnlyVMSnapshotCommand); + + if (answer == null || !answer.getResult()) { + transitStateWithoutThrow(vmSnapshotBeingReverted, VMSnapshot.Event.OperationFailed); + logger.error(answer != null ? answer.getDetails() : String.format("Communication failure with host [%s].", hostId)); + throw new CloudRuntimeException(String.format("Error reverting VM snapshot [%s].", vmSnapshot.getUuid())); + } + + RevertDiskOnlyVmSnapshotAnswer revertDiskOnlyVMSnapshotAnswer = (RevertDiskOnlyVmSnapshotAnswer) answer; + + for (VolumeObjectTO volumeObjectTo : revertDiskOnlyVMSnapshotAnswer.getVolumeObjectTos()) { + VolumeVO volumeVO = volumeDao.findById(volumeObjectTo.getVolumeId()); + volumeVO.setPath(volumeObjectTo.getPath()); + updateSizeIfNeeded(volumeSnapshots, volumeVO, volumeObjectTo); + + volumeDao.update(volumeVO.getId(), volumeVO); + publishUsageEvent(EventTypes.EVENT_VM_SNAPSHOT_REVERT, vmSnapshotBeingReverted, userVm, volumeObjectTo); + } + + transitStateWithoutThrow(vmSnapshotBeingReverted, VMSnapshot.Event.OperationSucceeded); + + VMSnapshotVO currentVmSnapshot = vmSnapshotDao.findCurrentSnapshotByVmId(userVm.getId()); + currentVmSnapshot.setCurrent(false); + vmSnapshotBeingReverted.setCurrent(true); + + vmSnapshotDao.update(currentVmSnapshot.getId(), currentVmSnapshot); + vmSnapshotDao.update(vmSnapshotBeingReverted.getId(), vmSnapshotBeingReverted); + + mergeOldSiblingWithOldParentIfOldParentIsDead(currentVmSnapshot, userVm, hostId, vmSnapshotHelper.getVolumeTOList(userVm.getId())); + return true; + } + + /** + * Updates the volume size if it changed due to the snapshot reversion. + * */ + private void updateSizeIfNeeded(List<SnapshotDataStoreVO> volumeSnapshots, VolumeVO volumeVO, VolumeObjectTO volumeObjectTO) { + SnapshotDataStoreVO snapshotRef = volumeSnapshots.stream().filter(snapshotDataStoreVO -> snapshotDataStoreVO.getVolumeId() == volumeVO.getId()). + findFirst(). + orElseThrow(() -> new CloudRuntimeException(String.format("Unable to map any snapshot to volume [%s].", volumeVO))); + + if (volumeVO.getSize() == snapshotRef.getSize()) { + logger.debug("No need to update the volume size and launch a resize event as the snapshot [{}] and volume [{}] size are equal.", snapshotRef.getSnapshotId(), volumeVO.getUuid()); + return; + } + + long delta = volumeVO.getSize() - snapshotRef.getSize(); + if (delta < 0){ Review Comment: ```suggestion if (delta < 0) { ``` -- This is an automated message from the Apache Git Service. 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