| /** |
| * 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.util.SequentialNumber; |
| |
| /** |
| * An id which uniquely identifies an inode. Id 1 to 16384 are reserved for |
| * potential future usage. The id won't be recycled and is not expected to wrap |
| * around in a very long time. Root inode id is always 16385. Id 0 is used for |
| * backward compatibility support. |
| */ |
| @InterfaceAudience.Private |
| public class INodeId extends SequentialNumber { |
| /** |
| * The last reserved inode id. InodeIDs are allocated from LAST_RESERVED_ID + |
| * 1. |
| */ |
| public static final long LAST_RESERVED_ID = 1 << 14; // 16384 |
| public static final long ROOT_INODE_ID = LAST_RESERVED_ID + 1; // 16385 |
| public static final long INVALID_INODE_ID = -1; |
| |
| INodeId() { |
| super(ROOT_INODE_ID); |
| } |
| } |