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/**
* 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.fs.viewfs;
import static org.apache.hadoop.fs.viewfs.Constants.PERMISSION_555;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.EnumSet;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.Map.Entry;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.BlockLocation;
import org.apache.hadoop.fs.BlockStoragePolicySpi;
import org.apache.hadoop.fs.ContentSummary;
import org.apache.hadoop.fs.CreateFlag;
import org.apache.hadoop.fs.FSDataInputStream;
import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.FileAlreadyExistsException;
import org.apache.hadoop.fs.FileChecksum;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.FsConstants;
import org.apache.hadoop.fs.FsServerDefaults;
import org.apache.hadoop.fs.FsStatus;
import org.apache.hadoop.fs.LocatedFileStatus;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.PathFilter;
import org.apache.hadoop.fs.QuotaUsage;
import org.apache.hadoop.fs.RemoteIterator;
import org.apache.hadoop.fs.XAttrSetFlag;
import org.apache.hadoop.fs.permission.AclEntry;
import org.apache.hadoop.fs.permission.AclStatus;
import org.apache.hadoop.fs.permission.AclUtil;
import org.apache.hadoop.fs.permission.FsAction;
import org.apache.hadoop.fs.permission.FsPermission;
import org.apache.hadoop.fs.viewfs.InodeTree.INode;
import org.apache.hadoop.fs.viewfs.InodeTree.INodeLink;
import org.apache.hadoop.security.AccessControlException;
import org.apache.hadoop.security.UserGroupInformation;
import org.apache.hadoop.util.Progressable;
import org.apache.hadoop.util.Time;
/**
* ViewFileSystem (extends the FileSystem interface) implements a client-side
* mount table. Its spec and implementation is identical to {@link ViewFs}.
*/
@InterfaceAudience.Public
@InterfaceStability.Evolving /*Evolving for a release,to be changed to Stable */
public class ViewFileSystem extends FileSystem {
private static final Path ROOT_PATH = new Path(Path.SEPARATOR);
static AccessControlException readOnlyMountTable(final String operation,
final String p) {
return new AccessControlException(
"InternalDir of ViewFileSystem is readonly; operation=" + operation +
"Path=" + p);
}
static AccessControlException readOnlyMountTable(final String operation,
final Path p) {
return readOnlyMountTable(operation, p.toString());
}
/**
* MountPoint representation built from the configuration.
*/
public static class MountPoint {
/**
* The mounted on path location.
*/
private final Path mountedOnPath;
/**
* Array of target FileSystem URIs.
*/
private final URI[] targetFileSystemURIs;
MountPoint(Path srcPath, URI[] targetFs) {
mountedOnPath = srcPath;
targetFileSystemURIs = targetFs;
}
public Path getMountedOnPath() {
return mountedOnPath;
}
public URI[] getTargetFileSystemURIs() {
return targetFileSystemURIs;
}
}
final long creationTime; // of the the mount table
final UserGroupInformation ugi; // the user/group of user who created mtable
URI myUri;
private Path workingDir;
Configuration config;
InodeTree fsState; // the fs state; ie the mount table
Path homeDir = null;
// Default to rename within same mountpoint
private RenameStrategy renameStrategy = RenameStrategy.SAME_MOUNTPOINT;
/**
* Make the path Absolute and get the path-part of a pathname.
* Checks that URI matches this file system
* and that the path-part is a valid name.
*
* @param p path
* @return path-part of the Path p
*/
String getUriPath(final Path p) {
checkPath(p);
return makeAbsolute(p).toUri().getPath();
}
private Path makeAbsolute(final Path f) {
return f.isAbsolute() ? f : new Path(workingDir, f);
}
/**
* This is the constructor with the signature needed by
* {@link FileSystem#createFileSystem(URI, Configuration)}
*
* After this constructor is called initialize() is called.
* @throws IOException
*/
public ViewFileSystem() throws IOException {
ugi = UserGroupInformation.getCurrentUser();
creationTime = Time.now();
}
/**
* Return the protocol scheme for the FileSystem.
*
* @return viewfs
*/
@Override
public String getScheme() {
return FsConstants.VIEWFS_SCHEME;
}
/**
* Called after a new FileSystem instance is constructed.
* @param theUri a uri whose authority section names the host, port, etc. for
* this FileSystem
* @param conf the configuration
*/
@Override
public void initialize(final URI theUri, final Configuration conf)
throws IOException {
super.initialize(theUri, conf);
setConf(conf);
config = conf;
// Now build client side view (i.e. client side mount table) from config.
final String authority = theUri.getAuthority();
try {
myUri = new URI(FsConstants.VIEWFS_SCHEME, authority, "/", null, null);
fsState = new InodeTree(conf, authority) {
@Override
protected FileSystem getTargetFileSystem(final URI uri)
throws URISyntaxException, IOException {
return new ChRootedFileSystem(uri, config);
}
@Override
protected FileSystem getTargetFileSystem(final INodeDir dir)
throws URISyntaxException {
return new InternalDirOfViewFs(dir, creationTime, ugi, myUri, config);
}
@Override
protected FileSystem getTargetFileSystem(final String settings,
final URI[] uris) throws URISyntaxException, IOException {
return NflyFSystem.createFileSystem(uris, config, settings);
}
};
workingDir = this.getHomeDirectory();
renameStrategy = RenameStrategy.valueOf(
conf.get(Constants.CONFIG_VIEWFS_RENAME_STRATEGY,
RenameStrategy.SAME_MOUNTPOINT.toString()));
} catch (URISyntaxException e) {
throw new IOException("URISyntax exception: " + theUri);
}
}
/**
* Convenience Constructor for apps to call directly
* @param theUri which must be that of ViewFileSystem
* @param conf
* @throws IOException
*/
ViewFileSystem(final URI theUri, final Configuration conf)
throws IOException {
this();
initialize(theUri, conf);
}
/**
* Convenience Constructor for apps to call directly
* @param conf
* @throws IOException
*/
public ViewFileSystem(final Configuration conf) throws IOException {
this(FsConstants.VIEWFS_URI, conf);
}
@Override
public URI getUri() {
return myUri;
}
@Override
public Path resolvePath(final Path f) throws IOException {
final InodeTree.ResolveResult res;
res = fsState.resolve(getUriPath(f), true);
if (res.isInternalDir()) {
return f;
}
return res.targetFileSystem.resolvePath(res.remainingPath);
}
@Override
public Path getHomeDirectory() {
if (homeDir == null) {
String base = fsState.getHomeDirPrefixValue();
if (base == null) {
base = "/user";
}
homeDir = (base.equals("/") ?
this.makeQualified(new Path(base + ugi.getShortUserName())):
this.makeQualified(new Path(base + "/" + ugi.getShortUserName())));
}
return homeDir;
}
@Override
public Path getWorkingDirectory() {
return workingDir;
}
@Override
public void setWorkingDirectory(final Path new_dir) {
getUriPath(new_dir); // this validates the path
workingDir = makeAbsolute(new_dir);
}
@Override
public FSDataOutputStream append(final Path f, final int bufferSize,
final Progressable progress) throws IOException {
InodeTree.ResolveResult res =
fsState.resolve(getUriPath(f), true);
return res.targetFileSystem.append(res.remainingPath, bufferSize, progress);
}
@Override
public FSDataOutputStream createNonRecursive(Path f, FsPermission permission,
EnumSet flags, int bufferSize, short replication,
long blockSize, Progressable progress) throws IOException {
InodeTree.ResolveResult res;
try {
res = fsState.resolve(getUriPath(f), false);
} catch (FileNotFoundException e) {
throw readOnlyMountTable("create", f);
}
assert(res.remainingPath != null);
return res.targetFileSystem.createNonRecursive(res.remainingPath,
permission, flags, bufferSize, replication, blockSize, progress);
}
@Override
public FSDataOutputStream create(final Path f, final FsPermission permission,
final boolean overwrite, final int bufferSize, final short replication,
final long blockSize, final Progressable progress) throws IOException {
InodeTree.ResolveResult res;
try {
res = fsState.resolve(getUriPath(f), false);
} catch (FileNotFoundException e) {
throw readOnlyMountTable("create", f);
}
assert(res.remainingPath != null);
return res.targetFileSystem.create(res.remainingPath, permission,
overwrite, bufferSize, replication, blockSize, progress);
}
@Override
public boolean delete(final Path f, final boolean recursive)
throws AccessControlException, FileNotFoundException, IOException {
InodeTree.ResolveResult res =
fsState.resolve(getUriPath(f), true);
// If internal dir or target is a mount link (ie remainingPath is Slash)
if (res.isInternalDir() || res.remainingPath == InodeTree.SlashPath) {
throw readOnlyMountTable("delete", f);
}
return res.targetFileSystem.delete(res.remainingPath, recursive);
}
@Override
@SuppressWarnings("deprecation")
public boolean delete(final Path f)
throws AccessControlException, FileNotFoundException, IOException {
return delete(f, true);
}
@Override
public BlockLocation[] getFileBlockLocations(FileStatus fs,
long start, long len) throws IOException {
final InodeTree.ResolveResult res =
fsState.resolve(getUriPath(fs.getPath()), true);
return res.targetFileSystem.getFileBlockLocations(
new ViewFsFileStatus(fs, res.remainingPath), start, len);
}
@Override
public FileChecksum getFileChecksum(final Path f)
throws AccessControlException, FileNotFoundException,
IOException {
InodeTree.ResolveResult res =
fsState.resolve(getUriPath(f), true);
return res.targetFileSystem.getFileChecksum(res.remainingPath);
}
@Override
public FileChecksum getFileChecksum(final Path f, final long length)
throws AccessControlException, FileNotFoundException,
IOException {
InodeTree.ResolveResult res =
fsState.resolve(getUriPath(f), true);
return res.targetFileSystem.getFileChecksum(res.remainingPath, length);
}
private static FileStatus fixFileStatus(FileStatus orig,
Path qualified) throws IOException {
// FileStatus#getPath is a fully qualified path relative to the root of
// target file system.
// We need to change it to viewfs URI - relative to root of mount table.
// The implementors of RawLocalFileSystem were trying to be very smart.
// They implement FileStatus#getOwner lazily -- the object
// returned is really a RawLocalFileSystem that expect the
// FileStatus#getPath to be unchanged so that it can get owner when needed.
// Hence we need to interpose a new ViewFileSystemFileStatus that
// works around.
if ("file".equals(orig.getPath().toUri().getScheme())) {
orig = wrapLocalFileStatus(orig, qualified);
}
orig.setPath(qualified);
return orig;
}
private static FileStatus wrapLocalFileStatus(FileStatus orig,
Path qualified) {
return orig instanceof LocatedFileStatus
? new ViewFsLocatedFileStatus((LocatedFileStatus)orig, qualified)
: new ViewFsFileStatus(orig, qualified);
}
@Override
public FileStatus getFileStatus(final Path f) throws AccessControlException,
FileNotFoundException, IOException {
InodeTree.ResolveResult res =
fsState.resolve(getUriPath(f), true);
FileStatus status = res.targetFileSystem.getFileStatus(res.remainingPath);
return fixFileStatus(status, this.makeQualified(f));
}
@Override
public void access(Path path, FsAction mode) throws AccessControlException,
FileNotFoundException, IOException {
InodeTree.ResolveResult res =
fsState.resolve(getUriPath(path), true);
res.targetFileSystem.access(res.remainingPath, mode);
}
@Override
public FileStatus[] listStatus(final Path f) throws AccessControlException,
FileNotFoundException, IOException {
InodeTree.ResolveResult res =
fsState.resolve(getUriPath(f), true);
FileStatus[] statusLst = res.targetFileSystem.listStatus(res.remainingPath);
if (!res.isInternalDir()) {
// We need to change the name in the FileStatus as described in
// {@link #getFileStatus }
int i = 0;
for (FileStatus status : statusLst) {
statusLst[i++] = fixFileStatus(status,
getChrootedPath(res, status, f));
}
}
return statusLst;
}
@Override
public RemoteIteratorlistLocatedStatus(final Path f,
final PathFilter filter) throws FileNotFoundException, IOException {
final InodeTree.ResolveResult res =
fsState.resolve(getUriPath(f), true);
final RemoteIterator statusIter =
res.targetFileSystem.listLocatedStatus(res.remainingPath);
if (res.isInternalDir()) {
return statusIter;
}
return new RemoteIterator() {
@Override
public boolean hasNext() throws IOException {
return statusIter.hasNext();
}
@Override
public LocatedFileStatus next() throws IOException {
final LocatedFileStatus status = statusIter.next();
return (LocatedFileStatus)fixFileStatus(status,
getChrootedPath(res, status, f));
}
};
}
private Path getChrootedPath(InodeTree.ResolveResult res,
FileStatus status, Path f) throws IOException {
final String suffix;
if (res.targetFileSystem instanceof ChRootedFileSystem) {
suffix = ((ChRootedFileSystem)res.targetFileSystem)
.stripOutRoot(status.getPath());
} else { // nfly
suffix = ((NflyFSystem.NflyStatus)status).stripRoot();
}
return this.makeQualified(
suffix.length() == 0 ? f : new Path(res.resolvedPath, suffix));
}
@Override
public boolean mkdirs(final Path dir, final FsPermission permission)
throws IOException {
InodeTree.ResolveResult res =
fsState.resolve(getUriPath(dir), false);
return res.targetFileSystem.mkdirs(res.remainingPath, permission);
}
@Override
public FSDataInputStream open(final Path f, final int bufferSize)
throws AccessControlException, FileNotFoundException, IOException {
InodeTree.ResolveResult res =
fsState.resolve(getUriPath(f), true);
return res.targetFileSystem.open(res.remainingPath, bufferSize);
}
@Override
public boolean rename(final Path src, final Path dst) throws IOException {
// passing resolveLastComponet as false to catch renaming a mount point to
// itself. We need to catch this as an internal operation and fail.
InodeTree.ResolveResult resSrc =
fsState.resolve(getUriPath(src), false);
if (resSrc.isInternalDir()) {
throw readOnlyMountTable("rename", src);
}
InodeTree.ResolveResult resDst =
fsState.resolve(getUriPath(dst), false);
if (resDst.isInternalDir()) {
throw readOnlyMountTable("rename", dst);
}
URI srcUri = resSrc.targetFileSystem.getUri();
URI dstUri = resDst.targetFileSystem.getUri();
verifyRenameStrategy(srcUri, dstUri,
resSrc.targetFileSystem == resDst.targetFileSystem, renameStrategy);
if (resSrc.targetFileSystem instanceof ChRootedFileSystem &&
resDst.targetFileSystem instanceof ChRootedFileSystem) {
ChRootedFileSystem srcFS = (ChRootedFileSystem) resSrc.targetFileSystem;
ChRootedFileSystem dstFS = (ChRootedFileSystem) resDst.targetFileSystem;
return srcFS.getMyFs().rename(srcFS.fullPath(resSrc.remainingPath),
dstFS.fullPath(resDst.remainingPath));
} else {
return resSrc.targetFileSystem.rename(resSrc.remainingPath, resDst.remainingPath);
}
}
static void verifyRenameStrategy(URI srcUri, URI dstUri,
boolean isSrcDestSame, ViewFileSystem.RenameStrategy renameStrategy)
throws IOException {
switch (renameStrategy) {
case SAME_FILESYSTEM_ACROSS_MOUNTPOINT:
if (srcUri.getAuthority() != null) {
if (!(srcUri.getScheme().equals(dstUri.getScheme()) && srcUri
.getAuthority().equals(dstUri.getAuthority()))) {
throw new IOException("Renames across Mount points not supported");
}
}
break;
case SAME_TARGET_URI_ACROSS_MOUNTPOINT:
// Alternate 2: Rename across mountpoints with same target.
// i.e. Rename across alias mountpoints.
//
// Note we compare the URIs. the URIs include the link targets.
// hence we allow renames across mount links as long as the mount links
// point to the same target.
if (!srcUri.equals(dstUri)) {
throw new IOException("Renames across Mount points not supported");
}
break;
case SAME_MOUNTPOINT:
//
// Alternate 3 : renames ONLY within the the same mount links.
//
if (!isSrcDestSame) {
throw new IOException("Renames across Mount points not supported");
}
break;
default:
throw new IllegalArgumentException ("Unexpected rename strategy");
}
}
@Override
public boolean truncate(final Path f, final long newLength)
throws IOException {
InodeTree.ResolveResult res =
fsState.resolve(getUriPath(f), true);
return res.targetFileSystem.truncate(res.remainingPath, newLength);
}
@Override
public void setOwner(final Path f, final String username,
final String groupname) throws AccessControlException,
FileNotFoundException, IOException {
InodeTree.ResolveResult res =
fsState.resolve(getUriPath(f), true);
res.targetFileSystem.setOwner(res.remainingPath, username, groupname);
}
@Override
public void setPermission(final Path f, final FsPermission permission)
throws AccessControlException, FileNotFoundException, IOException {
InodeTree.ResolveResult res =
fsState.resolve(getUriPath(f), true);
res.targetFileSystem.setPermission(res.remainingPath, permission);
}
@Override
public boolean setReplication(final Path f, final short replication)
throws AccessControlException, FileNotFoundException, IOException {
InodeTree.ResolveResult res =
fsState.resolve(getUriPath(f), true);
return res.targetFileSystem.setReplication(res.remainingPath, replication);
}
@Override
public void setTimes(final Path f, final long mtime, final long atime)
throws AccessControlException, FileNotFoundException, IOException {
InodeTree.ResolveResult res =
fsState.resolve(getUriPath(f), true);
res.targetFileSystem.setTimes(res.remainingPath, mtime, atime);
}
@Override
public void modifyAclEntries(Path path, List aclSpec)
throws IOException {
InodeTree.ResolveResult res = fsState.resolve(getUriPath(path),
true);
res.targetFileSystem.modifyAclEntries(res.remainingPath, aclSpec);
}
@Override
public void removeAclEntries(Path path, List aclSpec)
throws IOException {
InodeTree.ResolveResult res = fsState.resolve(getUriPath(path),
true);
res.targetFileSystem.removeAclEntries(res.remainingPath, aclSpec);
}
@Override
public void removeDefaultAcl(Path path)
throws IOException {
InodeTree.ResolveResult res =
fsState.resolve(getUriPath(path), true);
res.targetFileSystem.removeDefaultAcl(res.remainingPath);
}
@Override
public void removeAcl(Path path)
throws IOException {
InodeTree.ResolveResult res =
fsState.resolve(getUriPath(path), true);
res.targetFileSystem.removeAcl(res.remainingPath);
}
@Override
public void setAcl(Path path, List aclSpec) throws IOException {
InodeTree.ResolveResult res =
fsState.resolve(getUriPath(path), true);
res.targetFileSystem.setAcl(res.remainingPath, aclSpec);
}
@Override
public AclStatus getAclStatus(Path path) throws IOException {
InodeTree.ResolveResult res =
fsState.resolve(getUriPath(path), true);
return res.targetFileSystem.getAclStatus(res.remainingPath);
}
@Override
public void setXAttr(Path path, String name, byte[] value,
EnumSet flag) throws IOException {
InodeTree.ResolveResult res =
fsState.resolve(getUriPath(path), true);
res.targetFileSystem.setXAttr(res.remainingPath, name, value, flag);
}
@Override
public byte[] getXAttr(Path path, String name) throws IOException {
InodeTree.ResolveResult res =
fsState.resolve(getUriPath(path), true);
return res.targetFileSystem.getXAttr(res.remainingPath, name);
}
@Override
public Map getXAttrs(Path path) throws IOException {
InodeTree.ResolveResult res =
fsState.resolve(getUriPath(path), true);
return res.targetFileSystem.getXAttrs(res.remainingPath);
}
@Override
public Map getXAttrs(Path path, List names)
throws IOException {
InodeTree.ResolveResult res =
fsState.resolve(getUriPath(path), true);
return res.targetFileSystem.getXAttrs(res.remainingPath, names);
}
@Override
public List listXAttrs(Path path) throws IOException {
InodeTree.ResolveResult res =
fsState.resolve(getUriPath(path), true);
return res.targetFileSystem.listXAttrs(res.remainingPath);
}
@Override
public void removeXAttr(Path path, String name) throws IOException {
InodeTree.ResolveResult res = fsState.resolve(getUriPath(path),
true);
res.targetFileSystem.removeXAttr(res.remainingPath, name);
}
@Override
public void setVerifyChecksum(final boolean verifyChecksum) {
List> mountPoints =
fsState.getMountPoints();
for (InodeTree.MountPoint mount : mountPoints) {
mount.target.targetFileSystem.setVerifyChecksum(verifyChecksum);
}
}
@Override
public long getDefaultBlockSize() {
throw new NotInMountpointException("getDefaultBlockSize");
}
@Override
public short getDefaultReplication() {
throw new NotInMountpointException("getDefaultReplication");
}
@Override
public FsServerDefaults getServerDefaults() throws IOException {
throw new NotInMountpointException("getServerDefaults");
}
@Override
public long getDefaultBlockSize(Path f) {
try {
InodeTree.ResolveResult res =
fsState.resolve(getUriPath(f), true);
return res.targetFileSystem.getDefaultBlockSize(res.remainingPath);
} catch (FileNotFoundException e) {
throw new NotInMountpointException(f, "getDefaultBlockSize");
}
}
@Override
public short getDefaultReplication(Path f) {
try {
InodeTree.ResolveResult res =
fsState.resolve(getUriPath(f), true);
return res.targetFileSystem.getDefaultReplication(res.remainingPath);
} catch (FileNotFoundException e) {
throw new NotInMountpointException(f, "getDefaultReplication");
}
}
@Override
public FsServerDefaults getServerDefaults(Path f) throws IOException {
try {
InodeTree.ResolveResult res =
fsState.resolve(getUriPath(f), true);
return res.targetFileSystem.getServerDefaults(res.remainingPath);
} catch (FileNotFoundException e) {
throw new NotInMountpointException(f, "getServerDefaults");
}
}
@Override
public ContentSummary getContentSummary(Path f) throws IOException {
InodeTree.ResolveResult res =
fsState.resolve(getUriPath(f), true);
return res.targetFileSystem.getContentSummary(res.remainingPath);
}
@Override
public QuotaUsage getQuotaUsage(Path f) throws IOException {
InodeTree.ResolveResult res =
fsState.resolve(getUriPath(f), true);
return res.targetFileSystem.getQuotaUsage(res.remainingPath);
}
@Override
public void setWriteChecksum(final boolean writeChecksum) {
List> mountPoints =
fsState.getMountPoints();
for (InodeTree.MountPoint mount : mountPoints) {
mount.target.targetFileSystem.setWriteChecksum(writeChecksum);
}
}
@Override
public FileSystem[] getChildFileSystems() {
List> mountPoints =
fsState.getMountPoints();
Set children = new HashSet();
for (InodeTree.MountPoint mountPoint : mountPoints) {
FileSystem targetFs = mountPoint.target.targetFileSystem;
children.addAll(Arrays.asList(targetFs.getChildFileSystems()));
}
return children.toArray(new FileSystem[]{});
}
public MountPoint[] getMountPoints() {
List> mountPoints =
fsState.getMountPoints();
MountPoint[] result = new MountPoint[mountPoints.size()];
for ( int i = 0; i < mountPoints.size(); ++i ) {
result[i] = new MountPoint(new Path(mountPoints.get(i).src),
mountPoints.get(i).target.targetDirLinkList);
}
return result;
}
@Override
public Path createSnapshot(Path path, String snapshotName)
throws IOException {
InodeTree.ResolveResult res = fsState.resolve(getUriPath(path),
true);
return res.targetFileSystem.createSnapshot(res.remainingPath, snapshotName);
}
@Override
public void renameSnapshot(Path path, String snapshotOldName,
String snapshotNewName) throws IOException {
InodeTree.ResolveResult res = fsState.resolve(getUriPath(path),
true);
res.targetFileSystem.renameSnapshot(res.remainingPath, snapshotOldName,
snapshotNewName);
}
@Override
public void deleteSnapshot(Path path, String snapshotName)
throws IOException {
InodeTree.ResolveResult res = fsState.resolve(getUriPath(path),
true);
res.targetFileSystem.deleteSnapshot(res.remainingPath, snapshotName);
}
@Override
public void setStoragePolicy(Path src, String policyName) throws IOException {
InodeTree.ResolveResult res = fsState.resolve(getUriPath(src),
true);
res.targetFileSystem.setStoragePolicy(res.remainingPath, policyName);
}
@Override
public void unsetStoragePolicy(Path src) throws IOException {
InodeTree.ResolveResult res = fsState.resolve(getUriPath(src),
true);
res.targetFileSystem.unsetStoragePolicy(res.remainingPath);
}
@Override
public BlockStoragePolicySpi getStoragePolicy(Path src) throws IOException {
InodeTree.ResolveResult res = fsState.resolve(getUriPath(src),
true);
return res.targetFileSystem.getStoragePolicy(res.remainingPath);
}
@Override
public Collection getAllStoragePolicies()
throws IOException {
Collection allPolicies = new HashSet<>();
for (FileSystem fs : getChildFileSystems()) {
try {
Collection policies =
fs.getAllStoragePolicies();
allPolicies.addAll(policies);
} catch (UnsupportedOperationException e) {
// ignored
}
}
return allPolicies;
}
/**
* Get the trash root directory for current user when the path
* specified is deleted.
*
* @param path the trash root of the path to be determined.
* @return the trash root path.
*/
@Override
public Path getTrashRoot(Path path) {
try {
InodeTree.ResolveResult res =
fsState.resolve(getUriPath(path), true);
return res.targetFileSystem.getTrashRoot(res.remainingPath);
} catch (Exception e) {
throw new NotInMountpointException(path, "getTrashRoot");
}
}
/**
* Get all the trash roots for current user or all users.
*
* @param allUsers return trash roots for all users if true.
* @return all Trash root directories.
*/
@Override
public Collection getTrashRoots(boolean allUsers) {
List trashRoots = new ArrayList<>();
for (FileSystem fs : getChildFileSystems()) {
trashRoots.addAll(fs.getTrashRoots(allUsers));
}
return trashRoots;
}
@Override
public FsStatus getStatus() throws IOException {
return getStatus(null);
}
@Override
public FsStatus getStatus(Path p) throws IOException {
if (p == null) {
p = InodeTree.SlashPath;
}
InodeTree.ResolveResult res = fsState.resolve(
getUriPath(p), true);
return res.targetFileSystem.getStatus(p);
}
/**
* Return the total size of all files under "/", if {@link
* Constants#CONFIG_VIEWFS_LINK_MERGE_SLASH} is supported and is a valid
* mount point. Else, throw NotInMountpointException.
*
* @throws IOException
*/
@Override
public long getUsed() throws IOException {
InodeTree.ResolveResult res = fsState.resolve(
getUriPath(InodeTree.SlashPath), true);
if (res.isInternalDir()) {
throw new NotInMountpointException(InodeTree.SlashPath, "getUsed");
} else {
return res.targetFileSystem.getUsed();
}
}
@Override
public Path getLinkTarget(Path path) throws IOException {
InodeTree.ResolveResult res;
try {
res = fsState.resolve(getUriPath(path), true);
} catch (FileNotFoundException e) {
throw new NotInMountpointException(path, "getLinkTarget");
}
return res.targetFileSystem.getLinkTarget(res.remainingPath);
}
/**
* An instance of this class represents an internal dir of the viewFs
* that is internal dir of the mount table.
* It is a read only mount tables and create, mkdir or delete operations
* are not allowed.
* If called on create or mkdir then this target is the parent of the
* directory in which one is trying to create or mkdir; hence
* in this case the path name passed in is the last component.
* Otherwise this target is the end point of the path and hence
* the path name passed in is null.
*/
static class InternalDirOfViewFs extends FileSystem {
final InodeTree.INodeDir theInternalDir;
final long creationTime; // of the the mount table
final UserGroupInformation ugi; // the user/group of user who created mtable
final URI myUri;
public InternalDirOfViewFs(final InodeTree.INodeDir dir,
final long cTime, final UserGroupInformation ugi, URI uri,
Configuration config) throws URISyntaxException {
myUri = uri;
try {
initialize(myUri, config);
} catch (IOException e) {
throw new RuntimeException("Cannot occur");
}
theInternalDir = dir;
creationTime = cTime;
this.ugi = ugi;
}
static private void checkPathIsSlash(final Path f) throws IOException {
if (f != InodeTree.SlashPath) {
throw new IOException(
"Internal implementation error: expected file name to be /");
}
}
@Override
public URI getUri() {
return myUri;
}
@Override
public Path getWorkingDirectory() {
throw new RuntimeException(
"Internal impl error: getWorkingDir should not have been called");
}
@Override
public void setWorkingDirectory(final Path new_dir) {
throw new RuntimeException(
"Internal impl error: getWorkingDir should not have been called");
}
@Override
public FSDataOutputStream append(final Path f, final int bufferSize,
final Progressable progress) throws IOException {
throw readOnlyMountTable("append", f);
}
@Override
public FSDataOutputStream create(final Path f,
final FsPermission permission, final boolean overwrite,
final int bufferSize, final short replication, final long blockSize,
final Progressable progress) throws AccessControlException {
throw readOnlyMountTable("create", f);
}
@Override
public boolean delete(final Path f, final boolean recursive)
throws AccessControlException, IOException {
checkPathIsSlash(f);
throw readOnlyMountTable("delete", f);
}
@Override
@SuppressWarnings("deprecation")
public boolean delete(final Path f)
throws AccessControlException, IOException {
return delete(f, true);
}
@Override
public BlockLocation[] getFileBlockLocations(final FileStatus fs,
final long start, final long len) throws
FileNotFoundException, IOException {
checkPathIsSlash(fs.getPath());
throw new FileNotFoundException("Path points to dir not a file");
}
@Override
public FileChecksum getFileChecksum(final Path f)
throws FileNotFoundException, IOException {
checkPathIsSlash(f);
throw new FileNotFoundException("Path points to dir not a file");
}
@Override
public FileStatus getFileStatus(Path f) throws IOException {
checkPathIsSlash(f);
return new FileStatus(0, true, 0, 0, creationTime, creationTime,
PERMISSION_555, ugi.getShortUserName(), ugi.getPrimaryGroupName(),
new Path(theInternalDir.fullPath).makeQualified(
myUri, ROOT_PATH));
}
@Override
public FileStatus[] listStatus(Path f) throws AccessControlException,
FileNotFoundException, IOException {
checkPathIsSlash(f);
FileStatus[] result = new FileStatus[theInternalDir.getChildren().size()];
int i = 0;
for (Entry> iEntry :
theInternalDir.getChildren().entrySet()) {
INode inode = iEntry.getValue();
if (inode.isLink()) {
INodeLink link = (INodeLink) inode;
result[i++] = new FileStatus(0, false, 0, 0,
creationTime, creationTime, PERMISSION_555,
ugi.getShortUserName(), ugi.getPrimaryGroupName(),
link.getTargetLink(),
new Path(inode.fullPath).makeQualified(
myUri, null));
} else {
result[i++] = new FileStatus(0, true, 0, 0,
creationTime, creationTime, PERMISSION_555,
ugi.getShortUserName(), ugi.getGroupNames()[0],
new Path(inode.fullPath).makeQualified(
myUri, null));
}
}
return result;
}
@Override
public boolean mkdirs(Path dir, FsPermission permission)
throws AccessControlException, FileAlreadyExistsException {
if (theInternalDir.isRoot() && dir == null) {
throw new FileAlreadyExistsException("/ already exits");
}
// Note dir starts with /
if (theInternalDir.getChildren().containsKey(
dir.toString().substring(1))) {
return true; // this is the stupid semantics of FileSystem
}
throw readOnlyMountTable("mkdirs", dir);
}
@Override
public FSDataInputStream open(Path f, int bufferSize)
throws AccessControlException, FileNotFoundException, IOException {
checkPathIsSlash(f);
throw new FileNotFoundException("Path points to dir not a file");
}
@Override
public boolean rename(Path src, Path dst) throws AccessControlException,
IOException {
checkPathIsSlash(src);
checkPathIsSlash(dst);
throw readOnlyMountTable("rename", src);
}
@Override
public boolean truncate(Path f, long newLength) throws IOException {
throw readOnlyMountTable("truncate", f);
}
@Override
public void setOwner(Path f, String username, String groupname)
throws AccessControlException, IOException {
checkPathIsSlash(f);
throw readOnlyMountTable("setOwner", f);
}
@Override
public void setPermission(Path f, FsPermission permission)
throws AccessControlException, IOException {
checkPathIsSlash(f);
throw readOnlyMountTable("setPermission", f);
}
@Override
public boolean setReplication(Path f, short replication)
throws AccessControlException, IOException {
checkPathIsSlash(f);
throw readOnlyMountTable("setReplication", f);
}
@Override
public void setTimes(Path f, long mtime, long atime)
throws AccessControlException, IOException {
checkPathIsSlash(f);
throw readOnlyMountTable("setTimes", f);
}
@Override
public void setVerifyChecksum(boolean verifyChecksum) {
// Noop for viewfs
}
@Override
public FsServerDefaults getServerDefaults(Path f) throws IOException {
throw new NotInMountpointException(f, "getServerDefaults");
}
@Override
public long getDefaultBlockSize(Path f) {
throw new NotInMountpointException(f, "getDefaultBlockSize");
}
@Override
public short getDefaultReplication(Path f) {
throw new NotInMountpointException(f, "getDefaultReplication");
}
@Override
public void modifyAclEntries(Path path, List aclSpec)
throws IOException {
checkPathIsSlash(path);
throw readOnlyMountTable("modifyAclEntries", path);
}
@Override
public void removeAclEntries(Path path, List aclSpec)
throws IOException {
checkPathIsSlash(path);
throw readOnlyMountTable("removeAclEntries", path);
}
@Override
public void removeDefaultAcl(Path path) throws IOException {
checkPathIsSlash(path);
throw readOnlyMountTable("removeDefaultAcl", path);
}
@Override
public void removeAcl(Path path) throws IOException {
checkPathIsSlash(path);
throw readOnlyMountTable("removeAcl", path);
}
@Override
public void setAcl(Path path, List aclSpec) throws IOException {
checkPathIsSlash(path);
throw readOnlyMountTable("setAcl", path);
}
@Override
public AclStatus getAclStatus(Path path) throws IOException {
checkPathIsSlash(path);
return new AclStatus.Builder().owner(ugi.getShortUserName())
.group(ugi.getPrimaryGroupName())
.addEntries(AclUtil.getMinimalAcl(PERMISSION_555))
.stickyBit(false).build();
}
@Override
public void setXAttr(Path path, String name, byte[] value,
EnumSet flag) throws IOException {
checkPathIsSlash(path);
throw readOnlyMountTable("setXAttr", path);
}
@Override
public byte[] getXAttr(Path path, String name) throws IOException {
throw new NotInMountpointException(path, "getXAttr");
}
@Override
public Map getXAttrs(Path path) throws IOException {
throw new NotInMountpointException(path, "getXAttrs");
}
@Override
public Map getXAttrs(Path path, List names)
throws IOException {
throw new NotInMountpointException(path, "getXAttrs");
}
@Override
public List listXAttrs(Path path) throws IOException {
throw new NotInMountpointException(path, "listXAttrs");
}
@Override
public void removeXAttr(Path path, String name) throws IOException {
checkPathIsSlash(path);
throw readOnlyMountTable("removeXAttr", path);
}
@Override
public Path createSnapshot(Path path, String snapshotName)
throws IOException {
checkPathIsSlash(path);
throw readOnlyMountTable("createSnapshot", path);
}
@Override
public void renameSnapshot(Path path, String snapshotOldName,
String snapshotNewName) throws IOException {
checkPathIsSlash(path);
throw readOnlyMountTable("renameSnapshot", path);
}
@Override
public void deleteSnapshot(Path path, String snapshotName)
throws IOException {
checkPathIsSlash(path);
throw readOnlyMountTable("deleteSnapshot", path);
}
@Override
public QuotaUsage getQuotaUsage(Path f) throws IOException {
throw new NotInMountpointException(f, "getQuotaUsage");
}
@Override
public void setStoragePolicy(Path src, String policyName)
throws IOException {
checkPathIsSlash(src);
throw readOnlyMountTable("setStoragePolicy", src);
}
@Override
public void unsetStoragePolicy(Path src) throws IOException {
checkPathIsSlash(src);
throw readOnlyMountTable("unsetStoragePolicy", src);
}
@Override
public BlockStoragePolicySpi getStoragePolicy(Path src) throws IOException {
throw new NotInMountpointException(src, "getStoragePolicy");
}
@Override
public Collection getAllStoragePolicies()
throws IOException {
Collection allPolicies = new HashSet<>();
for (FileSystem fs : getChildFileSystems()) {
try {
Collection policies =
fs.getAllStoragePolicies();
allPolicies.addAll(policies);
} catch (UnsupportedOperationException e) {
// ignored
}
}
return allPolicies;
}
}
enum RenameStrategy {
SAME_MOUNTPOINT, SAME_TARGET_URI_ACROSS_MOUNTPOINT,
SAME_FILESYSTEM_ACROSS_MOUNTPOINT
}
}
