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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.hdfs.server.namenode;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.fs.permission.FsPermission;
import org.apache.hadoop.fs.permission.PermissionStatus;
import org.apache.hadoop.hdfs.server.namenode.snapshot.Snapshot;
import org.apache.hadoop.hdfs.util.LongBitFormat;
import org.apache.hadoop.util.LightWeightGSet.LinkedElement;
import com.google.common.base.Preconditions;
/**
* {@link INode} with additional fields including id, name, permission,
* access time and modification time.
*/
@InterfaceAudience.Private
public abstract class INodeWithAdditionalFields extends INode
implements LinkedElement {
// Note: this format is used both in-memory and on-disk. Changes will be
// incompatible.
enum PermissionStatusFormat implements LongBitFormat.Enum {
MODE(null, 16),
GROUP(MODE.BITS, 24),
USER(GROUP.BITS, 24);
final LongBitFormat BITS;
private PermissionStatusFormat(LongBitFormat previous, int length) {
BITS = new LongBitFormat(name(), previous, length, 0);
}
static String getUser(long permission) {
final int n = (int)USER.BITS.retrieve(permission);
String s = SerialNumberManager.USER.getString(n);
assert s != null;
return s;
}
static String getGroup(long permission) {
final int n = (int)GROUP.BITS.retrieve(permission);
return SerialNumberManager.GROUP.getString(n);
}
static short getMode(long permission) {
return (short)MODE.BITS.retrieve(permission);
}
/** Encode the {@link PermissionStatus} to a long. */
static long toLong(PermissionStatus ps) {
long permission = 0L;
final int user = SerialNumberManager.USER.getSerialNumber(
ps.getUserName());
assert user != 0;
permission = USER.BITS.combine(user, permission);
// ideally should assert on group but inodes are created with null
// group and then updated only when added to a directory.
final int group = SerialNumberManager.GROUP.getSerialNumber(
ps.getGroupName());
permission = GROUP.BITS.combine(group, permission);
final int mode = ps.getPermission().toShort();
permission = MODE.BITS.combine(mode, permission);
return permission;
}
static PermissionStatus toPermissionStatus(long id,
SerialNumberManager.StringTable stringTable) {
int uid = (int)USER.BITS.retrieve(id);
int gid = (int)GROUP.BITS.retrieve(id);
return new PermissionStatus(
SerialNumberManager.USER.getString(uid, stringTable),
SerialNumberManager.GROUP.getString(gid, stringTable),
new FsPermission(getMode(id)));
}
@Override
public int getLength() {
return BITS.getLength();
}
}
/** The inode id. */
final private long id;
/**
* The inode name is in java UTF8 encoding;
* The name in HdfsFileStatus should keep the same encoding as this.
* if this encoding is changed, implicitly getFileInfo and listStatus in
* clientProtocol are changed; The decoding at the client
* side should change accordingly.
*/
private byte[] name = null;
/**
* Permission encoded using {@link PermissionStatusFormat}.
* Codes other than {@link #clonePermissionStatus(INodeWithAdditionalFields)}
* and {@link #updatePermissionStatus(PermissionStatusFormat, long)}
* should not modify it.
*/
private long permission = 0L;
/** The last modification time*/
private long modificationTime = 0L;
/** The last access time*/
private long accessTime = 0L;
/** For implementing {@link LinkedElement}. */
private LinkedElement next = null;
/** An array {@link Feature}s. */
private static final Feature[] EMPTY_FEATURE = new Feature[0];
protected Feature[] features = EMPTY_FEATURE;
private INodeWithAdditionalFields(INode parent, long id, byte[] name,
long permission, long modificationTime, long accessTime) {
super(parent);
this.id = id;
this.name = name;
this.permission = permission;
this.modificationTime = modificationTime;
this.accessTime = accessTime;
}
INodeWithAdditionalFields(long id, byte[] name, PermissionStatus permissions,
long modificationTime, long accessTime) {
this(null, id, name, PermissionStatusFormat.toLong(permissions),
modificationTime, accessTime);
}
/** @param other Other node to be copied */
INodeWithAdditionalFields(INodeWithAdditionalFields other) {
this(other.getParentReference() != null ? other.getParentReference()
: other.getParent(), other.getId(), other.getLocalNameBytes(),
other.permission, other.modificationTime, other.accessTime);
}
@Override
public void setNext(LinkedElement next) {
this.next = next;
}
@Override
public LinkedElement getNext() {
return next;
}
/** Get inode id */
@Override
public final long getId() {
return this.id;
}
@Override
public final byte[] getLocalNameBytes() {
return name;
}
@Override
public final void setLocalName(byte[] name) {
this.name = name;
}
/** Clone the {@link PermissionStatus}. */
final void clonePermissionStatus(INodeWithAdditionalFields that) {
this.permission = that.permission;
}
@Override
final PermissionStatus getPermissionStatus(int snapshotId) {
return new PermissionStatus(getUserName(snapshotId), getGroupName(snapshotId),
getFsPermission(snapshotId));
}
private final void updatePermissionStatus(PermissionStatusFormat f, long n) {
this.permission = f.BITS.combine(n, permission);
}
@Override
final String getUserName(int snapshotId) {
if (snapshotId != Snapshot.CURRENT_STATE_ID) {
return getSnapshotINode(snapshotId).getUserName();
}
return PermissionStatusFormat.getUser(permission);
}
@Override
final void setUser(String user) {
int n = SerialNumberManager.USER.getSerialNumber(user);
updatePermissionStatus(PermissionStatusFormat.USER, n);
}
@Override
final String getGroupName(int snapshotId) {
if (snapshotId != Snapshot.CURRENT_STATE_ID) {
return getSnapshotINode(snapshotId).getGroupName();
}
return PermissionStatusFormat.getGroup(permission);
}
@Override
final void setGroup(String group) {
int n = SerialNumberManager.GROUP.getSerialNumber(group);
updatePermissionStatus(PermissionStatusFormat.GROUP, n);
}
@Override
final FsPermission getFsPermission(int snapshotId) {
if (snapshotId != Snapshot.CURRENT_STATE_ID) {
return getSnapshotINode(snapshotId).getFsPermission();
}
return new FsPermission(getFsPermissionShort());
}
@Override
public final short getFsPermissionShort() {
return PermissionStatusFormat.getMode(permission);
}
@Override
void setPermission(FsPermission permission) {
final short mode = permission.toShort();
updatePermissionStatus(PermissionStatusFormat.MODE, mode);
}
@Override
public long getPermissionLong() {
return permission;
}
@Override
public final AclFeature getAclFeature(int snapshotId) {
if (snapshotId != Snapshot.CURRENT_STATE_ID) {
return getSnapshotINode(snapshotId).getAclFeature();
}
return getFeature(AclFeature.class);
}
@Override
final long getModificationTime(int snapshotId) {
if (snapshotId != Snapshot.CURRENT_STATE_ID) {
return getSnapshotINode(snapshotId).getModificationTime();
}
return this.modificationTime;
}
/** Update modification time if it is larger than the current value. */
@Override
public final INode updateModificationTime(long mtime, int latestSnapshotId) {
Preconditions.checkState(isDirectory());
if (mtime <= modificationTime) {
return this;
}
return setModificationTime(mtime, latestSnapshotId);
}
final void cloneModificationTime(INodeWithAdditionalFields that) {
this.modificationTime = that.modificationTime;
}
@Override
public final void setModificationTime(long modificationTime) {
this.modificationTime = modificationTime;
}
@Override
final long getAccessTime(int snapshotId) {
if (snapshotId != Snapshot.CURRENT_STATE_ID) {
return getSnapshotINode(snapshotId).getAccessTime();
}
return accessTime;
}
/**
* Set last access time of inode.
*/
@Override
public final void setAccessTime(long accessTime) {
this.accessTime = accessTime;
}
protected void addFeature(Feature f) {
int size = features.length;
Feature[] arr = new Feature[size + 1];
if (size != 0) {
System.arraycopy(features, 0, arr, 0, size);
}
arr[size] = f;
features = arr;
}
protected void removeFeature(Feature f) {
int size = features.length;
if (size == 0) {
throwFeatureNotFoundException(f);
}
if (size == 1) {
if (features[0] != f) {
throwFeatureNotFoundException(f);
}
features = EMPTY_FEATURE;
return;
}
Feature[] arr = new Feature[size - 1];
int j = 0;
boolean overflow = false;
for (Feature f1 : features) {
if (f1 != f) {
if (j == size - 1) {
overflow = true;
break;
} else {
arr[j++] = f1;
}
}
}
if (overflow || j != size - 1) {
throwFeatureNotFoundException(f);
}
features = arr;
}
private void throwFeatureNotFoundException(Feature f) {
throw new IllegalStateException(
"Feature " + f.getClass().getSimpleName() + " not found.");
}
protected T getFeature(Class clazz) {
Preconditions.checkArgument(clazz != null);
final int size = features.length;
for (int i=0; i < size; i++) {
Feature f = features[i];
if (clazz.isAssignableFrom(f.getClass())) {
@SuppressWarnings("unchecked")
T ret = (T) f;
return ret;
}
}
return null;
}
public void removeAclFeature() {
AclFeature f = getAclFeature();
Preconditions.checkNotNull(f);
removeFeature(f);
AclStorage.removeAclFeature(f);
}
public void addAclFeature(AclFeature f) {
AclFeature f1 = getAclFeature();
if (f1 != null)
throw new IllegalStateException("Duplicated ACLFeature");
addFeature(AclStorage.addAclFeature(f));
}
@Override
XAttrFeature getXAttrFeature(int snapshotId) {
if (snapshotId != Snapshot.CURRENT_STATE_ID) {
return getSnapshotINode(snapshotId).getXAttrFeature();
}
return getFeature(XAttrFeature.class);
}
@Override
public void removeXAttrFeature() {
XAttrFeature f = getXAttrFeature();
Preconditions.checkNotNull(f);
removeFeature(f);
}
@Override
public void addXAttrFeature(XAttrFeature f) {
XAttrFeature f1 = getXAttrFeature();
Preconditions.checkState(f1 == null, "Duplicated XAttrFeature");
addFeature(f);
}
public final Feature[] getFeatures() {
return features;
}
}
