hadoop FSDirRenameOp 源码
haddop FSDirRenameOp 代码
文件路径：/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSDirRenameOp.java
/**
* 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.hadoop.hdfs.server.namenode;
import org.apache.hadoop.util.Preconditions;
import org.apache.hadoop.fs.FileAlreadyExistsException;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.InvalidPathException;
import org.apache.hadoop.fs.Options;
import org.apache.hadoop.fs.ParentNotDirectoryException;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.permission.FsAction;
import org.apache.hadoop.hdfs.DFSUtil;
import org.apache.hadoop.hdfs.DistributedFileSystem;
import org.apache.hadoop.hdfs.protocol.QuotaExceededException;
import org.apache.hadoop.hdfs.protocol.SnapshotException;
import org.apache.hadoop.hdfs.server.blockmanagement.BlockStoragePolicySuite;
import org.apache.hadoop.hdfs.server.namenode.FSDirectory.DirOp;
import org.apache.hadoop.hdfs.server.namenode.INode.BlocksMapUpdateInfo;
import org.apache.hadoop.hdfs.server.namenode.snapshot.Snapshot;
import org.apache.hadoop.hdfs.server.namenode.snapshot.SnapshotManager;
import org.apache.hadoop.hdfs.util.ReadOnlyList;
import org.apache.hadoop.util.ChunkedArrayList;
import org.apache.hadoop.util.Time;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import static org.apache.hadoop.hdfs.protocol.FSLimitException.MaxDirectoryItemsExceededException;
import static org.apache.hadoop.hdfs.protocol.FSLimitException.PathComponentTooLongException;
class FSDirRenameOp {
@Deprecated
static RenameResult renameToInt(
FSDirectory fsd, FSPermissionChecker pc, final String src,
final String dst, boolean logRetryCache) throws IOException {
if (NameNode.stateChangeLog.isDebugEnabled()) {
NameNode.stateChangeLog.debug("DIR* NameSystem.renameTo: " + src +
" to " + dst);
}
// Rename does not operate on link targets
// Do not resolveLink when checking permissions of src and dst
INodesInPath srcIIP = fsd.resolvePath(pc, src, DirOp.WRITE_LINK);
INodesInPath dstIIP = fsd.resolvePath(pc, dst, DirOp.CREATE_LINK);
dstIIP = dstForRenameTo(srcIIP, dstIIP);
return renameTo(fsd, pc, srcIIP, dstIIP, logRetryCache);
}
/**
* Verify quota for rename operation where srcInodes[srcInodes.length-1] moves
* dstInodes[dstInodes.length-1]
*/
private static void verifyQuotaForRename(FSDirectory fsd, INodesInPath src,
INodesInPath dst) throws QuotaExceededException {
if (!fsd.getFSNamesystem().isImageLoaded() || fsd.shouldSkipQuotaChecks()) {
// Do not check quota if edits log is still being processed
return;
}
int i = 0;
while(src.getINode(i) == dst.getINode(i)) { i++; }
// src[i - 1] is the last common ancestor.
BlockStoragePolicySuite bsps = fsd.getBlockStoragePolicySuite();
// Assume dstParent existence check done by callers.
INode dstParent = dst.getINode(-2);
// Use the destination parent's storage policy for quota delta verify.
final boolean isSrcSetSp = src.getLastINode().isSetStoragePolicy();
final byte storagePolicyID = isSrcSetSp ?
src.getLastINode().getLocalStoragePolicyID() :
dstParent.getStoragePolicyID();
final QuotaCounts delta = src.getLastINode()
.computeQuotaUsage(bsps, storagePolicyID, false,
Snapshot.CURRENT_STATE_ID);
// Reduce the required quota by dst that is being removed
final INode dstINode = dst.getLastINode();
if (dstINode != null) {
delta.subtract(dstINode.computeQuotaUsage(bsps));
}
FSDirectory.verifyQuota(dst, dst.length() - 1, delta, src.getINode(i - 1));
}
/**
* Checks file system limits (max component length and max directory items)
* during a rename operation.
*/
static void verifyFsLimitsForRename(FSDirectory fsd, INodesInPath srcIIP,
INodesInPath dstIIP)
throws PathComponentTooLongException, MaxDirectoryItemsExceededException {
byte[] dstChildName = dstIIP.getLastLocalName();
final String parentPath = dstIIP.getParentPath();
fsd.verifyMaxComponentLength(dstChildName, parentPath);
// Do not enforce max directory items if renaming within same directory.
if (srcIIP.getINode(-2) != dstIIP.getINode(-2)) {
fsd.verifyMaxDirItems(dstIIP.getINode(-2).asDirectory(), parentPath);
}
}
/**
* <br>
* Note: This is to be used by {@link FSEditLogLoader} only.
* <br>
*/
@Deprecated
static INodesInPath renameForEditLog(FSDirectory fsd, String src, String dst,
long timestamp) throws IOException {
final INodesInPath srcIIP = fsd.getINodesInPath(src, DirOp.WRITE_LINK);
INodesInPath dstIIP = fsd.getINodesInPath(dst, DirOp.WRITE_LINK);
// this is wrong but accidentally works. the edit contains the full path
// so the following will do nothing, but shouldn't change due to backward
// compatibility when maybe full path wasn't logged.
dstIIP = dstForRenameTo(srcIIP, dstIIP);
return unprotectedRenameTo(fsd, srcIIP, dstIIP, timestamp);
}
// if destination is a directory, append source child's name, else return
// iip as-is.
private static INodesInPath dstForRenameTo(
INodesInPath srcIIP, INodesInPath dstIIP) throws IOException {
INode dstINode = dstIIP.getLastINode();
if (dstINode != null && dstINode.isDirectory()) {
byte[] childName = srcIIP.getLastLocalName();
// new dest might exist so look it up.
INode childINode = dstINode.asDirectory().getChild(
childName, dstIIP.getPathSnapshotId());
dstIIP = INodesInPath.append(dstIIP, childINode, childName);
}
return dstIIP;
}
/**
* Change a path name
*
* @param fsd FSDirectory
* @param srcIIP source path
* @param dstIIP destination path
* @return true INodesInPath if rename succeeds; null otherwise
* @deprecated See {@link #renameToInt(FSDirectory, String, String,
* boolean, Options.Rename...)}
*/
@Deprecated
static INodesInPath unprotectedRenameTo(FSDirectory fsd,
final INodesInPath srcIIP, final INodesInPath dstIIP, long timestamp)
throws IOException {
assert fsd.hasWriteLock();
final INode srcInode = srcIIP.getLastINode();
List<INodeDirectory> snapshottableDirs = new ArrayList<>();
try {
validateRenameSource(fsd, srcIIP, snapshottableDirs);
} catch (SnapshotException e) {
throw e;
} catch (IOException ignored) {
return null;
}
String src = srcIIP.getPath();
String dst = dstIIP.getPath();
// validate the destination
if (dst.equals(src)) {
return dstIIP;
}
try {
validateDestination(src, dst, srcInode);
} catch (IOException ignored) {
return null;
}
if (dstIIP.getLastINode() != null) {
NameNode.stateChangeLog.warn("DIR* FSDirectory.unprotectedRenameTo: " +
"failed to rename " + src + " to " + dst + " because destination " +
"exists");
return null;
}
INode dstParent = dstIIP.getINode(-2);
if (dstParent == null) {
NameNode.stateChangeLog.warn("DIR* FSDirectory.unprotectedRenameTo: " +
"failed to rename " + src + " to " + dst + " because destination's " +
"parent does not exist");
return null;
}
validateNestSnapshot(fsd, src, dstParent.asDirectory(), snapshottableDirs);
checkUnderSameSnapshottableRoot(fsd, srcIIP, dstIIP);
fsd.ezManager.checkMoveValidity(srcIIP, dstIIP);
// Ensure dst has quota to accommodate rename
verifyFsLimitsForRename(fsd, srcIIP, dstIIP);
verifyQuotaForRename(fsd, srcIIP, dstIIP);
RenameOperation tx = new RenameOperation(fsd, srcIIP, dstIIP);
boolean added = false;
INodesInPath renamedIIP = null;
try {
// remove src
if (!tx.removeSrc4OldRename()) {
return null;
}
renamedIIP = tx.addSourceToDestination();
added = (renamedIIP != null);
if (added) {
if (NameNode.stateChangeLog.isDebugEnabled()) {
NameNode.stateChangeLog.debug("DIR* FSDirectory" +
".unprotectedRenameTo: " + src + " is renamed to " + dst);
}
tx.updateMtimeAndLease(timestamp);
tx.updateQuotasInSourceTree(fsd.getBlockStoragePolicySuite());
return renamedIIP;
}
} finally {
if (!added) {
tx.restoreSource();
}
}
NameNode.stateChangeLog.warn("DIR* FSDirectory.unprotectedRenameTo: " +
"failed to rename " + src + " to " + dst);
return null;
}
/**
* The new rename which has the POSIX semantic.
*/
static RenameResult renameToInt(
FSDirectory fsd, FSPermissionChecker pc, final String srcArg,
final String dstArg, boolean logRetryCache, Options.Rename... options)
throws IOException {
String src = srcArg;
String dst = dstArg;
if (NameNode.stateChangeLog.isDebugEnabled()) {
NameNode.stateChangeLog.debug("DIR* NameSystem.renameTo: with options -" +
" " + src + " to " + dst);
}
BlocksMapUpdateInfo collectedBlocks = new BlocksMapUpdateInfo();
// returns resolved path
return renameTo(fsd, pc, src, dst, collectedBlocks, logRetryCache, options);
}
/**
* @see {@link #unprotectedRenameTo(FSDirectory, String, String, INodesInPath,
* INodesInPath, long, BlocksMapUpdateInfo, Options.Rename...)}
*/
static RenameResult renameTo(FSDirectory fsd, FSPermissionChecker pc,
String src, String dst, BlocksMapUpdateInfo collectedBlocks,
boolean logRetryCache,Options.Rename... options)
throws IOException {
final INodesInPath srcIIP = fsd.resolvePath(pc, src, DirOp.WRITE_LINK);
final INodesInPath dstIIP = fsd.resolvePath(pc, dst, DirOp.CREATE_LINK);
if(fsd.isNonEmptyDirectory(srcIIP)) {
DFSUtil.checkProtectedDescendants(fsd, srcIIP);
}
if (fsd.isPermissionEnabled()) {
boolean renameToTrash = false;
if (null != options &&
Arrays.asList(options).
contains(Options.Rename.TO_TRASH)) {
renameToTrash = true;
}
if(renameToTrash) {
// if destination is the trash directory,
// besides the permission check on "rename"
// we need to enforce the check for "delete"
// otherwise, it would expose a
// security hole that stuff moved to trash
// will be deleted by superuser
fsd.checkPermission(pc, srcIIP, false, null, FsAction.WRITE, null,
FsAction.ALL, true);
} else {
// Rename does not operate on link targets
// Do not resolveLink when checking permissions of src and dst
// Check write access to parent of src
fsd.checkPermission(pc, srcIIP, false, null, FsAction.WRITE, null,
null, false);
}
// Check write access to ancestor of dst
fsd.checkPermission(pc, dstIIP, false, FsAction.WRITE, null, null, null,
false);
}
if (NameNode.stateChangeLog.isDebugEnabled()) {
NameNode.stateChangeLog.debug("DIR* FSDirectory.renameTo: " + src + " to "
+ dst);
}
final long mtime = Time.now();
fsd.writeLock();
final RenameResult result;
try {
result = unprotectedRenameTo(fsd, srcIIP, dstIIP, mtime,
collectedBlocks, options);
if (result.filesDeleted) {
FSDirDeleteOp.incrDeletedFileCount(1);
}
} finally {
fsd.writeUnlock();
}
fsd.getEditLog().logRename(
srcIIP.getPath(), dstIIP.getPath(), mtime, logRetryCache, options);
return result;
}
/**
* Rename src to dst.
* <br>
* Note: This is to be used by {@link org.apache.hadoop.hdfs.server
* .namenode.FSEditLogLoader} only.
* <br>
*
* @param fsd FSDirectory
* @param src source path
* @param dst destination path
* @param timestamp modification time
* @param options Rename options
*/
static void renameForEditLog(
FSDirectory fsd, String src, String dst, long timestamp,
Options.Rename... options)
throws IOException {
BlocksMapUpdateInfo collectedBlocks = new BlocksMapUpdateInfo();
final INodesInPath srcIIP = fsd.getINodesInPath(src, DirOp.WRITE_LINK);
final INodesInPath dstIIP = fsd.getINodesInPath(dst, DirOp.WRITE_LINK);
unprotectedRenameTo(fsd, srcIIP, dstIIP, timestamp,
collectedBlocks, options);
if (!collectedBlocks.getToDeleteList().isEmpty()) {
fsd.getFSNamesystem().getBlockManager()
.removeBlocksAndUpdateSafemodeTotal(collectedBlocks);
}
}
/**
* Rename src to dst.
* See {@link DistributedFileSystem#rename(Path, Path, Options.Rename...)}
* for details related to rename semantics and exceptions.
*
* @param fsd FSDirectory
* @param srcIIP source path
* @param dstIIP destination path
* @param timestamp modification time
* @param collectedBlocks blocks to be removed
* @param options Rename options
* @return whether a file/directory gets overwritten in the dst path
*/
static RenameResult unprotectedRenameTo(FSDirectory fsd,
final INodesInPath srcIIP, final INodesInPath dstIIP, long timestamp,
BlocksMapUpdateInfo collectedBlocks, Options.Rename... options)
throws IOException {
assert fsd.hasWriteLock();
boolean overwrite = options != null
&& Arrays.asList(options).contains(Options.Rename.OVERWRITE);
final String src = srcIIP.getPath();
final String dst = dstIIP.getPath();
final String error;
final INode srcInode = srcIIP.getLastINode();
List<INodeDirectory> srcSnapshottableDirs = new ArrayList<>();
validateRenameSource(fsd, srcIIP, srcSnapshottableDirs);
// validate the destination
if (dst.equals(src)) {
throw new FileAlreadyExistsException("The source " + src +
" and destination " + dst + " are the same");
}
validateDestination(src, dst, srcInode);
if (dstIIP.length() == 1) {
error = "rename destination cannot be the root";
NameNode.stateChangeLog.warn("DIR* FSDirectory.unprotectedRenameTo: " +
error);
throw new IOException(error);
}
BlockStoragePolicySuite bsps = fsd.getBlockStoragePolicySuite();
fsd.ezManager.checkMoveValidity(srcIIP, dstIIP);
final INode dstInode = dstIIP.getLastINode();
List<INodeDirectory> dstSnapshottableDirs = new ArrayList<>();
if (dstInode != null) { // Destination exists
validateOverwrite(src, dst, overwrite, srcInode, dstInode);
FSDirSnapshotOp.checkSnapshot(fsd, dstIIP, dstSnapshottableDirs);
}
INode dstParent = dstIIP.getINode(-2);
if (dstParent == null) {
error = "rename destination parent " + dst + " not found.";
NameNode.stateChangeLog.warn("DIR* FSDirectory.unprotectedRenameTo: " +
error);
throw new FileNotFoundException(error);
}
if (!dstParent.isDirectory()) {
error = "rename destination parent " + dst + " is a file.";
NameNode.stateChangeLog.warn("DIR* FSDirectory.unprotectedRenameTo: " +
error);
throw new ParentNotDirectoryException(error);
}
validateNestSnapshot(fsd, src,
dstParent.asDirectory(), srcSnapshottableDirs);
checkUnderSameSnapshottableRoot(fsd, srcIIP, dstIIP);
// Ensure dst has quota to accommodate rename
verifyFsLimitsForRename(fsd, srcIIP, dstIIP);
verifyQuotaForRename(fsd, srcIIP, dstIIP);
RenameOperation tx = new RenameOperation(fsd, srcIIP, dstIIP);
boolean undoRemoveSrc = true;
tx.removeSrc();
boolean undoRemoveDst = false;
long removedNum = 0;
try {
if (dstInode != null) { // dst exists, remove it
removedNum = tx.removeDst();
if (removedNum != -1) {
undoRemoveDst = true;
}
}
// add src as dst to complete rename
INodesInPath renamedIIP = tx.addSourceToDestination();
if (renamedIIP != null) {
undoRemoveSrc = false;
if (NameNode.stateChangeLog.isDebugEnabled()) {
NameNode.stateChangeLog.debug("DIR* FSDirectory.unprotectedRenameTo: "
+ src + " is renamed to " + dst);
}
tx.updateMtimeAndLease(timestamp);
// Collect the blocks and remove the lease for previous dst
boolean filesDeleted = false;
if (undoRemoveDst) {
undoRemoveDst = false;
if (removedNum > 0) {
filesDeleted = tx.cleanDst(bsps, collectedBlocks);
}
}
if (dstSnapshottableDirs.size() > 0) {
// There are snapshottable directories (without snapshots) to be
// deleted. Need to update the SnapshotManager.
fsd.getFSNamesystem().removeSnapshottableDirs(dstSnapshottableDirs);
}
tx.updateQuotasInSourceTree(bsps);
return createRenameResult(
fsd, renamedIIP, filesDeleted, collectedBlocks);
}
} finally {
if (undoRemoveSrc) {
tx.restoreSource();
}
if (undoRemoveDst) { // Rename failed - restore dst
tx.restoreDst(bsps);
}
}
NameNode.stateChangeLog.warn("DIR* FSDirectory.unprotectedRenameTo: " +
"failed to rename " + src + " to " + dst);
throw new IOException("rename from " + src + " to " + dst + " failed.");
}
/**
* @deprecated Use {@link #renameToInt(FSDirectory, String, String,
* boolean, Options.Rename...)}
*/
@Deprecated
private static RenameResult renameTo(FSDirectory fsd, FSPermissionChecker pc,
INodesInPath srcIIP, INodesInPath dstIIP, boolean logRetryCache)
throws IOException {
if(fsd.isNonEmptyDirectory(srcIIP)) {
DFSUtil.checkProtectedDescendants(fsd, srcIIP);
}
if (fsd.isPermissionEnabled()) {
// Check write access to parent of src
fsd.checkPermission(pc, srcIIP, false, null, FsAction.WRITE, null, null,
false);
// Check write access to ancestor of dst
fsd.checkPermission(pc, dstIIP, false, FsAction.WRITE, null, null,
null, false);
}
if (NameNode.stateChangeLog.isDebugEnabled()) {
NameNode.stateChangeLog.debug("DIR* FSDirectory.renameTo: " +
srcIIP.getPath() + " to " + dstIIP.getPath());
}
final long mtime = Time.now();
INodesInPath renameIIP;
fsd.writeLock();
try {
renameIIP = unprotectedRenameTo(fsd, srcIIP, dstIIP, mtime);
} finally {
fsd.writeUnlock();
}
if (renameIIP != null) {
fsd.getEditLog().logRename(
srcIIP.getPath(), dstIIP.getPath(), mtime, logRetryCache);
}
// this rename never overwrites the dest so files deleted and collected
// are irrelevant.
return createRenameResult(fsd, renameIIP, false, null);
}
private static void validateDestination(
String src, String dst, INode srcInode)
throws IOException {
String error;
if (srcInode.isSymlink() &&
dst.equals(srcInode.asSymlink().getSymlinkString())) {
throw new FileAlreadyExistsException("Cannot rename symlink " + src
+ " to its target " + dst);
}
// dst cannot be a directory or a file under src
if (dst.startsWith(src)
&& dst.charAt(src.length()) == Path.SEPARATOR_CHAR) {
error = "Rename destination " + dst
+ " is a directory or file under source " + src;
NameNode.stateChangeLog.warn("DIR* FSDirectory.unprotectedRenameTo: "
+ error);
throw new IOException(error);
}
if (FSDirectory.isExactReservedName(src)
|| FSDirectory.isExactReservedName(dst)) {
error = "Cannot rename to or from /.reserved";
throw new InvalidPathException(error);
}
}
private static void validateOverwrite(
String src, String dst, boolean overwrite, INode srcInode, INode dstInode)
throws IOException {
String error;// It's OK to rename a file to a symlink and vice versa
if (dstInode.isDirectory() != srcInode.isDirectory()) {
error = "Source " + src + " and destination " + dst
+ " must both be directories";
NameNode.stateChangeLog.warn("DIR* FSDirectory.unprotectedRenameTo: "
+ error);
throw new IOException(error);
}
if (!overwrite) { // If destination exists, overwrite flag must be true
error = "rename destination " + dst + " already exists";
NameNode.stateChangeLog.warn("DIR* FSDirectory.unprotectedRenameTo: "
+ error);
throw new FileAlreadyExistsException(error);
}
if (dstInode.isDirectory()) {
final ReadOnlyList<INode> children = dstInode.asDirectory()
.getChildrenList(Snapshot.CURRENT_STATE_ID);
if (!children.isEmpty()) {
error = "rename destination directory is not empty: " + dst;
NameNode.stateChangeLog.warn("DIR* FSDirectory.unprotectedRenameTo: "
+ error);
throw new IOException(error);
}
}
}
private static void validateRenameSource(FSDirectory fsd,
INodesInPath srcIIP, List<INodeDirectory> snapshottableDirs)
throws IOException {
String error;
final INode srcInode = srcIIP.getLastINode();
// validate source
if (srcInode == null) {
error = "rename source " + srcIIP.getPath() + " is not found.";
NameNode.stateChangeLog.warn("DIR* FSDirectory.unprotectedRenameTo: "
+ error);
throw new FileNotFoundException(error);
}
if (srcIIP.length() == 1) {
error = "rename source cannot be the root";
NameNode.stateChangeLog.warn("DIR* FSDirectory.unprotectedRenameTo: "
+ error);
throw new IOException(error);
}
// srcInode and its subtree cannot contain snapshottable directories with
// snapshots
FSDirSnapshotOp.checkSnapshot(fsd, srcIIP, snapshottableDirs);
}
private static void validateNestSnapshot(FSDirectory fsd, String srcPath,
INodeDirectory dstParent, List<INodeDirectory> snapshottableDirs)
throws SnapshotException {
if (fsd.getFSNamesystem().getSnapshotManager().isAllowNestedSnapshots()) {
return;
}
/*
* snapshottableDirs is a list of snapshottable directory (child of rename
* src) which do not have snapshots yet. If this list is not empty, that
* means rename src has snapshottable descendant directories.
*/
if (snapshottableDirs != null && snapshottableDirs.size() > 0) {
if (fsd.getFSNamesystem().getSnapshotManager()
.isDescendantOfSnapshotRoot(dstParent)) {
String dstPath = dstParent.getFullPathName();
throw new SnapshotException("Unable to rename because " + srcPath
+ " has snapshottable descendant directories and " + dstPath
+ " is a descent of a snapshottable directory, and HDFS does"
+ " not support nested snapshottable directory.");
}
}
}
private static class RenameOperation {
private final FSDirectory fsd;
private INodesInPath srcIIP;
private final INodesInPath srcParentIIP;
private INodesInPath dstIIP;
private final INodesInPath dstParentIIP;
private final INodeReference.WithCount withCount;
private final int srcRefDstSnapshot;
private final INodeDirectory srcParent;
private final byte[] srcChildName;
private final boolean isSrcInSnapshot;
private final boolean srcChildIsReference;
private final QuotaCounts oldSrcCounts;
private INode srcChild;
private INode oldDstChild;
RenameOperation(FSDirectory fsd, INodesInPath srcIIP, INodesInPath dstIIP) {
this.fsd = fsd;
this.srcIIP = srcIIP;
this.dstIIP = dstIIP;
this.srcParentIIP = srcIIP.getParentINodesInPath();
this.dstParentIIP = dstIIP.getParentINodesInPath();
BlockStoragePolicySuite bsps = fsd.getBlockStoragePolicySuite();
srcChild = this.srcIIP.getLastINode();
srcChildName = srcChild.getLocalNameBytes();
final int srcLatestSnapshotId = srcIIP.getLatestSnapshotId();
isSrcInSnapshot = srcChild.isInLatestSnapshot(srcLatestSnapshotId);
srcChildIsReference = srcChild.isReference();
srcParent = this.srcIIP.getINode(-2).asDirectory();
// Record the snapshot on srcChild. After the rename, before any new
// snapshot is taken on the dst tree, changes will be recorded in the
// latest snapshot of the src tree.
if (isSrcInSnapshot) {
if (srcChild.isFile()) {
INodeFile file = srcChild.asFile();
file.recordModification(srcLatestSnapshotId, true);
} else {
srcChild.recordModification(srcLatestSnapshotId);
}
}
// check srcChild for reference
srcRefDstSnapshot = srcChildIsReference ?
srcChild.asReference().getDstSnapshotId() : Snapshot.CURRENT_STATE_ID;
oldSrcCounts = new QuotaCounts.Builder().build();
if (isSrcInSnapshot) {
final INodeReference.WithName withName = srcParent
.replaceChild4ReferenceWithName(srcChild, srcLatestSnapshotId);
withCount = (INodeReference.WithCount) withName.getReferredINode();
srcChild = withName;
this.srcIIP = INodesInPath.replace(srcIIP, srcIIP.length() - 1,
srcChild);
// get the counts before rename
oldSrcCounts.add(withCount.getReferredINode().computeQuotaUsage(bsps));
} else if (srcChildIsReference) {
// srcChild is reference but srcChild is not in latest snapshot
withCount = (INodeReference.WithCount) srcChild.asReference()
.getReferredINode();
} else {
withCount = null;
}
}
long removeSrc() throws IOException {
long removedNum = fsd.removeLastINode(srcIIP);
if (removedNum == -1) {
String error = "Failed to rename " + srcIIP.getPath() + " to " +
dstIIP.getPath() + " because the source can not be removed";
NameNode.stateChangeLog.warn("DIR* FSDirRenameOp.unprotectedRenameTo:" +
error);
throw new IOException(error);
} else {
// update the quota count if necessary
fsd.updateCountForDelete(srcChild, srcIIP);
srcIIP = INodesInPath.replace(srcIIP, srcIIP.length() - 1, null);
return removedNum;
}
}
boolean removeSrc4OldRename() {
final long removedSrc = fsd.removeLastINode(srcIIP);
if (removedSrc == -1) {
NameNode.stateChangeLog.warn("DIR* FSDirRenameOp.unprotectedRenameTo: "
+ "failed to rename " + srcIIP.getPath() + " to "
+ dstIIP.getPath() + " because the source can not be removed");
return false;
} else {
// update the quota count if necessary
fsd.updateCountForDelete(srcChild, srcIIP);
srcIIP = INodesInPath.replace(srcIIP, srcIIP.length() - 1, null);
return true;
}
}
long removeDst() {
long removedNum = fsd.removeLastINode(dstIIP);
if (removedNum != -1) {
oldDstChild = dstIIP.getLastINode();
// update the quota count if necessary
fsd.updateCountForDelete(oldDstChild, dstIIP);
dstIIP = INodesInPath.replace(dstIIP, dstIIP.length() - 1, null);
}
return removedNum;
}
INodesInPath addSourceToDestination() {
final INode dstParent = dstParentIIP.getLastINode();
final byte[] dstChildName = dstIIP.getLastLocalName();
final INode toDst;
if (withCount == null) {
srcChild.setLocalName(dstChildName);
toDst = srcChild;
} else {
withCount.getReferredINode().setLocalName(dstChildName);
toDst = new INodeReference.DstReference(dstParent.asDirectory(),
withCount, dstIIP.getLatestSnapshotId());
}
return fsd.addLastINodeNoQuotaCheck(dstParentIIP, toDst);
}
void updateMtimeAndLease(long timestamp) {
srcParent.updateModificationTime(timestamp, srcIIP.getLatestSnapshotId());
final INode dstParent = dstParentIIP.getLastINode();
dstParent.updateModificationTime(timestamp, dstIIP.getLatestSnapshotId());
}
void restoreSource() {
// Rename failed - restore src
final INode oldSrcChild = srcChild;
// put it back
if (withCount == null) {
srcChild.setLocalName(srcChildName);
} else if (!srcChildIsReference) { // src must be in snapshot
// the withCount node will no longer be used thus no need to update
// its reference number here
srcChild = withCount.getReferredINode();
srcChild.setLocalName(srcChildName);
} else {
withCount.removeReference(oldSrcChild.asReference());
srcChild = new INodeReference.DstReference(srcParent, withCount,
srcRefDstSnapshot);
withCount.getReferredINode().setLocalName(srcChildName);
}
if (isSrcInSnapshot) {
srcParent.undoRename4ScrParent(oldSrcChild.asReference(), srcChild);
} else {
// srcParent is not an INodeDirectoryWithSnapshot, we only need to add
// the srcChild back
fsd.addLastINodeNoQuotaCheck(srcParentIIP, srcChild);
}
}
void restoreDst(BlockStoragePolicySuite bsps) {
Preconditions.checkState(oldDstChild != null);
final INodeDirectory dstParent = dstParentIIP.getLastINode().asDirectory();
if (dstParent.isWithSnapshot()) {
dstParent.undoRename4DstParent(bsps, oldDstChild, dstIIP.getLatestSnapshotId());
} else {
fsd.addLastINodeNoQuotaCheck(dstParentIIP, oldDstChild);
}
if (oldDstChild != null && oldDstChild.isReference()) {
final INodeReference removedDstRef = oldDstChild.asReference();
final INodeReference.WithCount wc = (INodeReference.WithCount)
removedDstRef.getReferredINode().asReference();
wc.addReference(removedDstRef);
}
}
boolean cleanDst(
BlockStoragePolicySuite bsps, BlocksMapUpdateInfo collectedBlocks) {
Preconditions.checkState(oldDstChild != null);
List<INode> removedINodes = new ChunkedArrayList<>();
List<Long> removedUCFiles = new ChunkedArrayList<>();
INode.ReclaimContext context = new INode.ReclaimContext(
bsps, collectedBlocks, removedINodes, removedUCFiles);
final boolean filesDeleted;
if (!oldDstChild.isInLatestSnapshot(dstIIP.getLatestSnapshotId())) {
oldDstChild.destroyAndCollectBlocks(context);
filesDeleted = true;
} else {
oldDstChild.cleanSubtree(context, Snapshot.CURRENT_STATE_ID,
dstIIP.getLatestSnapshotId());
filesDeleted = context.quotaDelta().getNsDelta() >= 0;
}
fsd.updateReplicationFactor(context.collectedBlocks()
.toUpdateReplicationInfo());
fsd.getFSNamesystem().removeLeasesAndINodes(
removedUCFiles, removedINodes, false);
return filesDeleted;
}
void updateQuotasInSourceTree(BlockStoragePolicySuite bsps) {
// update the quota usage in src tree
if (isSrcInSnapshot) {
// get the counts after rename
QuotaCounts newSrcCounts = srcChild.computeQuotaUsage(bsps, false);
newSrcCounts.subtract(oldSrcCounts);
srcParent.addSpaceConsumed(newSrcCounts);
}
}
}
private static void checkUnderSameSnapshottableRoot(
FSDirectory fsd, INodesInPath srcIIP, INodesInPath dstIIP)
throws IOException {
// Ensure rename out of a snapshottable root is not permitted if ordered
// snapshot deletion feature is enabled
SnapshotManager snapshotManager = fsd.getFSNamesystem().
getSnapshotManager();
if (snapshotManager.isSnapshotDeletionOrdered() && fsd.getFSNamesystem()
.isSnapshotTrashRootEnabled()) {
INodeDirectory srcRoot = snapshotManager.
getSnapshottableAncestorDir(srcIIP);
INodeDirectory dstRoot = snapshotManager.
getSnapshottableAncestorDir(dstIIP);
// Ensure snapshoottable root for both src and dest are same.
if (srcRoot != dstRoot) {
String errMsg = "Source " + srcIIP.getPath() +
" and dest " + dstIIP.getPath() + " are not under " +
"the same snapshot root.";
throw new SnapshotException(errMsg);
}
}
}
private static RenameResult createRenameResult(FSDirectory fsd,
INodesInPath dst, boolean filesDeleted,
BlocksMapUpdateInfo collectedBlocks) throws IOException {
boolean success = (dst != null);
FileStatus auditStat = success ? fsd.getAuditFileInfo(dst) : null;
return new RenameResult(
success, auditStat, filesDeleted, collectedBlocks);
}
static class RenameResult {
final boolean success;
final FileStatus auditStat;
final boolean filesDeleted;
final BlocksMapUpdateInfo collectedBlocks;
RenameResult(boolean success, FileStatus auditStat,
boolean filesDeleted, BlocksMapUpdateInfo collectedBlocks) {
this.success = success;
this.auditStat = auditStat;
this.filesDeleted = filesDeleted;
this.collectedBlocks = collectedBlocks;
}
}
}
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