/**
* 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_RRR;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.ArrayList;
import java.util.EnumSet;
import java.util.List;
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.AbstractFileSystem;
import org.apache.hadoop.fs.BlockLocation;
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.FsConstants;
import org.apache.hadoop.fs.FsServerDefaults;
import org.apache.hadoop.fs.FsStatus;
import org.apache.hadoop.fs.Options.ChecksumOpt;
import org.apache.hadoop.fs.ParentNotDirectoryException;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.RemoteIterator;
import org.apache.hadoop.fs.UnresolvedLinkException;
import org.apache.hadoop.fs.UnsupportedFileSystemException;
import org.apache.hadoop.fs.local.LocalConfigKeys;
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.security.token.Token;
import org.apache.hadoop.util.Progressable;
import org.apache.hadoop.util.Time;
/**
* ViewFs (extends the AbstractFileSystem interface) implements a client-side
* mount table. The viewFs file system is implemented completely in memory on
* the client side. The client-side mount table allows a client to provide a
* customized view of a file system namespace that is composed from
* one or more individual file systems (a localFs or Hdfs, S3fs, etc).
* For example one could have a mount table that provides links such as
* <ul>
* <li> /user -> hdfs://nnContainingUserDir/user
* <li> /project/foo -> hdfs://nnProject1/projects/foo
* <li> /project/bar -> hdfs://nnProject2/projects/bar
* <li> /tmp -> hdfs://nnTmp/privateTmpForUserXXX
* </ul>
*
* ViewFs is specified with the following URI: <b>viewfs:///</b>
* <p>
* To use viewfs one would typically set the default file system in the
* config (i.e. fs.default.name< = viewfs:///) along with the
* mount table config variables as described below.
*
* <p>
* <b> ** Config variables to specify the mount table entries ** </b>
* <p>
*
* The file system is initialized from the standard Hadoop config through
* config variables.
* See {@link FsConstants} for URI and Scheme constants;
* See {@link Constants} for config var constants;
* see {@link ConfigUtil} for convenient lib.
*
* <p>
* All the mount table config entries for view fs are prefixed by
* <b>fs.viewfs.mounttable.</b>
* For example the above example can be specified with the following
* config variables:
* <ul>
* <li> fs.viewfs.mounttable.default.link./user=
* hdfs://nnContainingUserDir/user
* <li> fs.viewfs.mounttable.default.link./project/foo=
* hdfs://nnProject1/projects/foo
* <li> fs.viewfs.mounttable.default.link./project/bar=
* hdfs://nnProject2/projects/bar
* <li> fs.viewfs.mounttable.default.link./tmp=
* hdfs://nnTmp/privateTmpForUserXXX
* </ul>
*
* The default mount table (when no authority is specified) is
* from config variables prefixed by <b>fs.viewFs.mounttable.default </b>
* The authority component of a URI can be used to specify a different mount
* table. For example,
* <ul>
* <li> viewfs://sanjayMountable/
* </ul>
* is initialized from fs.viewFs.mounttable.sanjayMountable.* config variables.
*
* <p>
* <b> **** Merge Mounts **** </b>(NOTE: merge mounts are not implemented yet.)
* <p>
*
* One can also use "MergeMounts" to merge several directories (this is
* sometimes called union-mounts or junction-mounts in the literature.
* For example of the home directories are stored on say two file systems
* (because they do not fit on one) then one could specify a mount
* entry such as following merges two dirs:
* <ul>
* <li> /user -> hdfs://nnUser1/user,hdfs://nnUser2/user
* </ul>
* Such a mergeLink can be specified with the following config var where ","
* is used as the separator for each of links to be merged:
* <ul>
* <li> fs.viewfs.mounttable.default.linkMerge./user=
* hdfs://nnUser1/user,hdfs://nnUser1/user
* </ul>
* A special case of the merge mount is where mount table's root is merged
* with the root (slash) of another file system:
* <ul>
* <li> fs.viewfs.mounttable.default.linkMergeSlash=hdfs://nn99/
* </ul>
* In this cases the root of the mount table is merged with the root of
* <b>hdfs://nn99/ </b>
*/
@InterfaceAudience.Public
@InterfaceStability.Evolving /*Evolving for a release,to be changed to Stable */
public class ViewFs extends AbstractFileSystem {
final long creationTime; // of the the mount table
final UserGroupInformation ugi; // the user/group of user who created mtable
final Configuration config;
InodeTree<AbstractFileSystem> fsState; // the fs state; ie the mount table
Path homeDir = null;
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());
}
static public class MountPoint {
private Path src; // the src of the mount
private URI[] targets; // target of the mount; Multiple targets imply mergeMount
MountPoint(Path srcPath, URI[] targetURIs) {
src = srcPath;
targets = targetURIs;
}
Path getSrc() {
return src;
}
URI[] getTargets() {
return targets;
}
}
public ViewFs(final Configuration conf) throws IOException,
URISyntaxException {
this(FsConstants.VIEWFS_URI, conf);
}
/**
* This constructor has the signature needed by
* {@link AbstractFileSystem#createFileSystem(URI, Configuration)}.
*
* @param theUri which must be that of ViewFs
* @param conf
* @throws IOException
* @throws URISyntaxException
*/
ViewFs(final URI theUri, final Configuration conf) throws IOException,
URISyntaxException {
super(theUri, FsConstants.VIEWFS_SCHEME, false, -1);
creationTime = Time.now();
ugi = UserGroupInformation.getCurrentUser();
config = conf;
// Now build client side view (i.e. client side mount table) from config.
String authority = theUri.getAuthority();
fsState = new InodeTree<AbstractFileSystem>(conf, authority) {
@Override
protected
AbstractFileSystem getTargetFileSystem(final URI uri)
throws URISyntaxException, UnsupportedFileSystemException {
String pathString = uri.getPath();
if (pathString.isEmpty()) {
pathString = "/";
}
return new ChRootedFs(
AbstractFileSystem.createFileSystem(uri, config),
new Path(pathString));
}
@Override
protected
AbstractFileSystem getTargetFileSystem(
final INodeDir<AbstractFileSystem> dir) throws URISyntaxException {
return new InternalDirOfViewFs(dir, creationTime, ugi, getUri());
}
@Override
protected
AbstractFileSystem getTargetFileSystem(URI[] mergeFsURIList)
throws URISyntaxException, UnsupportedFileSystemException {
throw new UnsupportedFileSystemException("mergefs not implemented yet");
// return MergeFs.createMergeFs(mergeFsURIList, config);
}
};
}
@Override
public FsServerDefaults getServerDefaults() throws IOException {
return LocalConfigKeys.getServerDefaults();
}
@Override
public int getUriDefaultPort() {
return -1;
}
@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 resolvePath(final Path f) throws FileNotFoundException,
AccessControlException, UnresolvedLinkException, IOException {
final InodeTree.ResolveResult<AbstractFileSystem> res;
res = fsState.resolve(getUriPath(f), true);
if (res.isInternalDir()) {
return f;
}
return res.targetFileSystem.resolvePath(res.remainingPath);
}
@Override
public FSDataOutputStream createInternal(final Path f,
final EnumSet<CreateFlag> flag, final FsPermission absolutePermission,
final int bufferSize, final short replication, final long blockSize,
final Progressable progress, final ChecksumOpt checksumOpt,
final boolean createParent) throws AccessControlException,
FileAlreadyExistsException, FileNotFoundException,
ParentNotDirectoryException, UnsupportedFileSystemException,
UnresolvedLinkException, IOException {
InodeTree.ResolveResult<AbstractFileSystem> res;
try {
res = fsState.resolve(getUriPath(f), false);
} catch (FileNotFoundException e) {
if (createParent) {
throw readOnlyMountTable("create", f);
} else {
throw e;
}
}
assert(res.remainingPath != null);
return res.targetFileSystem.createInternal(res.remainingPath, flag,
absolutePermission, bufferSize, replication,
blockSize, progress, checksumOpt,
createParent);
}
@Override
public boolean delete(final Path f, final boolean recursive)
throws AccessControlException, FileNotFoundException,
UnresolvedLinkException, IOException {
InodeTree.ResolveResult<AbstractFileSystem> 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 new AccessControlException(
"Cannot delete internal mount table directory: " + f);
}
return res.targetFileSystem.delete(res.remainingPath, recursive);
}
@Override
public BlockLocation[] getFileBlockLocations(final Path f, final long start,
final long len) throws AccessControlException, FileNotFoundException,
UnresolvedLinkException, IOException {
InodeTree.ResolveResult<AbstractFileSystem> res =
fsState.resolve(getUriPath(f), true);
return
res.targetFileSystem.getFileBlockLocations(res.remainingPath, start, len);
}
@Override
public FileChecksum getFileChecksum(final Path f)
throws AccessControlException, FileNotFoundException,
UnresolvedLinkException, IOException {
InodeTree.ResolveResult<AbstractFileSystem> res =
fsState.resolve(getUriPath(f), true);
return res.targetFileSystem.getFileChecksum(res.remainingPath);
}
@Override
public FileStatus getFileStatus(final Path f) throws AccessControlException,
FileNotFoundException, UnresolvedLinkException, IOException {
InodeTree.ResolveResult<AbstractFileSystem> res =
fsState.resolve(getUriPath(f), true);
// 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#getOwener 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 ViewFsFileStatus that works around.
FileStatus status = res.targetFileSystem.getFileStatus(res.remainingPath);
return new ViewFsFileStatus(status, this.makeQualified(f));
}
@Override
public FileStatus getFileLinkStatus(final Path f)
throws AccessControlException, FileNotFoundException,
UnsupportedFileSystemException, IOException {
InodeTree.ResolveResult<AbstractFileSystem> res =
fsState.resolve(getUriPath(f), false); // do not follow mount link
return res.targetFileSystem.getFileLinkStatus(res.remainingPath);
}
@Override
public FsStatus getFsStatus() throws AccessControlException,
FileNotFoundException, IOException {
return new FsStatus(0, 0, 0);
}
@Override
public RemoteIterator<FileStatus> listStatusIterator(final Path f)
throws AccessControlException, FileNotFoundException,
UnresolvedLinkException, IOException {
final InodeTree.ResolveResult<AbstractFileSystem> res =
fsState.resolve(getUriPath(f), true);
final RemoteIterator<FileStatus> fsIter =
res.targetFileSystem.listStatusIterator(res.remainingPath);
if (res.isInternalDir()) {
return fsIter;
}
return new RemoteIterator<FileStatus>() {
final RemoteIterator<FileStatus> myIter;
final ChRootedFs targetFs;
{ // Init
myIter = fsIter;
targetFs = (ChRootedFs) res.targetFileSystem;
}
@Override
public boolean hasNext() throws IOException {
return myIter.hasNext();
}
@Override
public FileStatus next() throws IOException {
FileStatus status = myIter.next();
String suffix = targetFs.stripOutRoot(status.getPath());
return new ViewFsFileStatus(status, makeQualified(
suffix.length() == 0 ? f : new Path(res.resolvedPath, suffix)));
}
};
}
@Override
public FileStatus[] listStatus(final Path f) throws AccessControlException,
FileNotFoundException, UnresolvedLinkException, IOException {
InodeTree.ResolveResult<AbstractFileSystem> 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 }
ChRootedFs targetFs;
targetFs = (ChRootedFs) res.targetFileSystem;
int i = 0;
for (FileStatus status : statusLst) {
String suffix = targetFs.stripOutRoot(status.getPath());
statusLst[i++] = new ViewFsFileStatus(status, this.makeQualified(
suffix.length() == 0 ? f : new Path(res.resolvedPath, suffix)));
}
}
return statusLst;
}
@Override
public void mkdir(final Path dir, final FsPermission permission,
final boolean createParent) throws AccessControlException,
FileAlreadyExistsException,
FileNotFoundException, UnresolvedLinkException, IOException {
InodeTree.ResolveResult<AbstractFileSystem> res =
fsState.resolve(getUriPath(dir), false);
res.targetFileSystem.mkdir(res.remainingPath, permission, createParent);
}
@Override
public FSDataInputStream open(final Path f, final int bufferSize)
throws AccessControlException, FileNotFoundException,
UnresolvedLinkException, IOException {
InodeTree.ResolveResult<AbstractFileSystem> res =
fsState.resolve(getUriPath(f), true);
return res.targetFileSystem.open(res.remainingPath, bufferSize);
}
@Override
public void renameInternal(final Path src, final Path dst,
final boolean overwrite) throws IOException, UnresolvedLinkException {
// passing resolveLastComponet as false to catch renaming a mount point
// itself we need to catch this as an internal operation and fail.
InodeTree.ResolveResult<AbstractFileSystem> resSrc =
fsState.resolve(getUriPath(src), false);
if (resSrc.isInternalDir()) {
throw new AccessControlException(
"Cannot Rename within internal dirs of mount table: it is readOnly");
}
InodeTree.ResolveResult<AbstractFileSystem> resDst =
fsState.resolve(getUriPath(dst), false);
if (resDst.isInternalDir()) {
throw new AccessControlException(
"Cannot Rename within internal dirs of mount table: it is readOnly");
}
/**
// Alternate 1: renames within same file system - valid but we disallow
// Alternate 2: (as described in next para - valid but we have disallowed it
//
// 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 (!resSrc.targetFileSystem.getUri().equals(
resDst.targetFileSystem.getUri())) {
throw new IOException("Renames across Mount points not supported");
}
*/
//
// Alternate 3 : renames ONLY within the the same mount links.
//
if (resSrc.targetFileSystem !=resDst.targetFileSystem) {
throw new IOException("Renames across Mount points not supported");
}
resSrc.targetFileSystem.renameInternal(resSrc.remainingPath,
resDst.remainingPath, overwrite);
}
@Override
public void renameInternal(final Path src, final Path dst)
throws AccessControlException, FileAlreadyExistsException,
FileNotFoundException, ParentNotDirectoryException,
UnresolvedLinkException, IOException {
renameInternal(src, dst, false);
}
@Override
public boolean supportsSymlinks() {
return true;
}
@Override
public void createSymlink(final Path target, final Path link,
final boolean createParent) throws IOException, UnresolvedLinkException {
InodeTree.ResolveResult<AbstractFileSystem> res;
try {
res = fsState.resolve(getUriPath(link), false);
} catch (FileNotFoundException e) {
if (createParent) {
throw readOnlyMountTable("createSymlink", link);
} else {
throw e;
}
}
assert(res.remainingPath != null);
res.targetFileSystem.createSymlink(target, res.remainingPath,
createParent);
}
@Override
public Path getLinkTarget(final Path f) throws IOException {
InodeTree.ResolveResult<AbstractFileSystem> res =
fsState.resolve(getUriPath(f), false); // do not follow mount link
return res.targetFileSystem.getLinkTarget(res.remainingPath);
}
@Override
public void setOwner(final Path f, final String username,
final String groupname) throws AccessControlException,
FileNotFoundException, UnresolvedLinkException, IOException {
InodeTree.ResolveResult<AbstractFileSystem> 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,
UnresolvedLinkException, IOException {
InodeTree.ResolveResult<AbstractFileSystem> 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,
UnresolvedLinkException, IOException {
InodeTree.ResolveResult<AbstractFileSystem> 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,
UnresolvedLinkException, IOException {
InodeTree.ResolveResult<AbstractFileSystem> res =
fsState.resolve(getUriPath(f), true);
res.targetFileSystem.setTimes(res.remainingPath, mtime, atime);
}
@Override
public void setVerifyChecksum(final boolean verifyChecksum)
throws AccessControlException, IOException {
// This is a file system level operations, however ViewFs
// points to many file systems. Noop for ViewFs.
}
public MountPoint[] getMountPoints() {
List<InodeTree.MountPoint<AbstractFileSystem>> 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 List<Token<?>> getDelegationTokens(String renewer) throws IOException {
List<InodeTree.MountPoint<AbstractFileSystem>> mountPoints =
fsState.getMountPoints();
int initialListSize = 0;
for (InodeTree.MountPoint<AbstractFileSystem> im : mountPoints) {
initialListSize += im.target.targetDirLinkList.length;
}
List<Token<?>> result = new ArrayList<Token<?>>(initialListSize);
for ( int i = 0; i < mountPoints.size(); ++i ) {
List<Token<?>> tokens =
mountPoints.get(i).target.targetFileSystem.getDelegationTokens(renewer);
if (tokens != null) {
result.addAll(tokens);
}
}
return result;
}
@Override
public boolean isValidName(String src) {
// Prefix validated at mount time and rest of path validated by mount target.
return true;
}
/*
* An instance of this class represents an internal dir of the viewFs
* ie internal dir of the mount table.
* It is a ready only mount tbale 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 AbstractFileSystem {
final InodeTree.INodeDir<AbstractFileSystem> theInternalDir;
final long creationTime; // of the the mount table
final UserGroupInformation ugi; // the user/group of user who created mtable
final URI myUri; // the URI of the outer ViewFs
public InternalDirOfViewFs(final InodeTree.INodeDir<AbstractFileSystem> dir,
final long cTime, final UserGroupInformation ugi, final URI uri)
throws URISyntaxException {
super(FsConstants.VIEWFS_URI, FsConstants.VIEWFS_SCHEME, false, -1);
theInternalDir = dir;
creationTime = cTime;
this.ugi = ugi;
myUri = uri;
}
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 FSDataOutputStream createInternal(final Path f,
final EnumSet<CreateFlag> flag, final FsPermission absolutePermission,
final int bufferSize, final short replication, final long blockSize,
final Progressable progress, final ChecksumOpt checksumOpt,
final boolean createParent) throws AccessControlException,
FileAlreadyExistsException, FileNotFoundException,
ParentNotDirectoryException, UnsupportedFileSystemException,
UnresolvedLinkException, IOException {
throw readOnlyMountTable("create", f);
}
@Override
public boolean delete(final Path f, final boolean recursive)
throws AccessControlException, IOException {
checkPathIsSlash(f);
throw readOnlyMountTable("delete", f);
}
@Override
public BlockLocation[] getFileBlockLocations(final Path f, final long start,
final long len) throws FileNotFoundException, IOException {
checkPathIsSlash(f);
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(final Path f) throws IOException {
checkPathIsSlash(f);
return new FileStatus(0, true, 0, 0, creationTime, creationTime,
PERMISSION_RRR, ugi.getUserName(), ugi.getGroupNames()[0],
new Path(theInternalDir.fullPath).makeQualified(
myUri, null));
}
@Override
public FileStatus getFileLinkStatus(final Path f)
throws FileNotFoundException {
// look up i internalDirs children - ignore first Slash
INode<AbstractFileSystem> inode =
theInternalDir.children.get(f.toUri().toString().substring(1));
if (inode == null) {
throw new FileNotFoundException(
"viewFs internal mount table - missing entry:" + f);
}
FileStatus result;
if (inode instanceof INodeLink) {
INodeLink<AbstractFileSystem> inodelink =
(INodeLink<AbstractFileSystem>) inode;
result = new FileStatus(0, false, 0, 0, creationTime, creationTime,
PERMISSION_RRR, ugi.getUserName(), ugi.getGroupNames()[0],
inodelink.getTargetLink(),
new Path(inode.fullPath).makeQualified(
myUri, null));
} else {
result = new FileStatus(0, true, 0, 0, creationTime, creationTime,
PERMISSION_RRR, ugi.getUserName(), ugi.getGroupNames()[0],
new Path(inode.fullPath).makeQualified(
myUri, null));
}
return result;
}
@Override
public FsStatus getFsStatus() {
return new FsStatus(0, 0, 0);
}
@Override
public FsServerDefaults getServerDefaults() throws IOException {
throw new IOException("FsServerDefaults not implemented yet");
}
@Override
public int getUriDefaultPort() {
return -1;
}
@Override
public FileStatus[] listStatus(final Path f) throws AccessControlException,
IOException {
checkPathIsSlash(f);
FileStatus[] result = new FileStatus[theInternalDir.children.size()];
int i = 0;
for (Entry<String, INode<AbstractFileSystem>> iEntry :
theInternalDir.children.entrySet()) {
INode<AbstractFileSystem> inode = iEntry.getValue();
if (inode instanceof INodeLink ) {
INodeLink<AbstractFileSystem> link =
(INodeLink<AbstractFileSystem>) inode;
result[i++] = new FileStatus(0, false, 0, 0,
creationTime, creationTime,
PERMISSION_RRR, ugi.getUserName(), ugi.getGroupNames()[0],
link.getTargetLink(),
new Path(inode.fullPath).makeQualified(
myUri, null));
} else {
result[i++] = new FileStatus(0, true, 0, 0,
creationTime, creationTime,
PERMISSION_RRR, ugi.getUserName(), ugi.getGroupNames()[0],
new Path(inode.fullPath).makeQualified(
myUri, null));
}
}
return result;
}
@Override
public void mkdir(final Path dir, final FsPermission permission,
final boolean createParent) throws AccessControlException,
FileAlreadyExistsException {
if (theInternalDir.isRoot && dir == null) {
throw new FileAlreadyExistsException("/ already exits");
}
throw readOnlyMountTable("mkdir", dir);
}
@Override
public FSDataInputStream open(final Path f, final int bufferSize)
throws FileNotFoundException, IOException {
checkPathIsSlash(f);
throw new FileNotFoundException("Path points to dir not a file");
}
@Override
public void renameInternal(final Path src, final Path dst)
throws AccessControlException, IOException {
checkPathIsSlash(src);
checkPathIsSlash(dst);
throw readOnlyMountTable("rename", src);
}
@Override
public boolean supportsSymlinks() {
return true;
}
@Override
public void createSymlink(final Path target, final Path link,
final boolean createParent) throws AccessControlException {
throw readOnlyMountTable("createSymlink", link);
}
@Override
public Path getLinkTarget(final Path f) throws FileNotFoundException,
IOException {
return getFileLinkStatus(f).getSymlink();
}
@Override
public void setOwner(final Path f, final String username,
final String groupname) throws AccessControlException, IOException {
checkPathIsSlash(f);
throw readOnlyMountTable("setOwner", f);
}
@Override
public void setPermission(final Path f, final FsPermission permission)
throws AccessControlException, IOException {
checkPathIsSlash(f);
throw readOnlyMountTable("setPermission", f);
}
@Override
public boolean setReplication(final Path f, final short replication)
throws AccessControlException, IOException {
checkPathIsSlash(f);
throw readOnlyMountTable("setReplication", f);
}
@Override
public void setTimes(final Path f, final long mtime, final long atime)
throws AccessControlException, IOException {
checkPathIsSlash(f);
throw readOnlyMountTable("setTimes", f);
}
@Override
public void setVerifyChecksum(final boolean verifyChecksum)
throws AccessControlException {
throw readOnlyMountTable("setVerifyChecksum", "");
}
}
}