/**
* 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.nfs.nfs3;
import java.io.IOException;
import org.apache.hadoop.hdfs.DFSClient;
import org.apache.hadoop.hdfs.protocol.HdfsFileStatus;
import org.apache.hadoop.nfs.NfsFileType;
import org.apache.hadoop.nfs.NfsTime;
import org.apache.hadoop.nfs.nfs3.FileHandle;
import org.apache.hadoop.nfs.nfs3.IdUserGroup;
import org.apache.hadoop.nfs.nfs3.Nfs3Constant;
import org.apache.hadoop.nfs.nfs3.Nfs3FileAttributes;
import org.apache.hadoop.nfs.nfs3.response.WccAttr;
import org.apache.hadoop.nfs.nfs3.response.WccData;
import org.apache.hadoop.oncrpc.XDR;
import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.channel.Channel;
/**
* Utility/helper methods related to NFS
*/
public class Nfs3Utils {
public final static String INODEID_PATH_PREFIX = "/.reserved/.inodes/";
public static String getFileIdPath(FileHandle handle) {
return getFileIdPath(handle.getFileId());
}
public static String getFileIdPath(long fileId) {
return INODEID_PATH_PREFIX + fileId;
}
public static HdfsFileStatus getFileStatus(DFSClient client, String fileIdPath)
throws IOException {
return client.getFileLinkInfo(fileIdPath);
}
public static Nfs3FileAttributes getNfs3FileAttrFromFileStatus(
HdfsFileStatus fs, IdUserGroup iug) {
/**
* Some 32bit Linux client has problem with 64bit fileId: it seems the 32bit
* client takes only the lower 32bit of the fileId and treats it as signed
* int. When the 32th bit is 1, the client considers it invalid.
*/
NfsFileType fileType = fs.isDir() ? NfsFileType.NFSDIR : NfsFileType.NFSREG;
fileType = fs.isSymlink() ? NfsFileType.NFSLNK : fileType;
return new Nfs3FileAttributes(fileType, fs.getChildrenNum(), fs
.getPermission().toShort(), iug.getUidAllowingUnknown(fs.getOwner()),
iug.getGidAllowingUnknown(fs.getGroup()), fs.getLen(), 0 /* fsid */,
fs.getFileId(), fs.getModificationTime(), fs.getAccessTime());
}
public static Nfs3FileAttributes getFileAttr(DFSClient client,
String fileIdPath, IdUserGroup iug) throws IOException {
HdfsFileStatus fs = getFileStatus(client, fileIdPath);
return fs == null ? null : getNfs3FileAttrFromFileStatus(fs, iug);
}
public static WccAttr getWccAttr(DFSClient client, String fileIdPath)
throws IOException {
HdfsFileStatus fstat = getFileStatus(client, fileIdPath);
if (fstat == null) {
return null;
}
long size = fstat.isDir() ? Nfs3FileAttributes.getDirSize(fstat
.getChildrenNum()) : fstat.getLen();
return new WccAttr(size, new NfsTime(fstat.getModificationTime()),
new NfsTime(fstat.getModificationTime()));
}
public static WccAttr getWccAttr(Nfs3FileAttributes attr) {
return new WccAttr(attr.getSize(), attr.getMtime(), attr.getCtime());
}
// TODO: maybe not efficient
public static WccData createWccData(final WccAttr preOpAttr,
DFSClient dfsClient, final String fileIdPath, final IdUserGroup iug)
throws IOException {
Nfs3FileAttributes postOpDirAttr = getFileAttr(dfsClient, fileIdPath, iug);
return new WccData(preOpAttr, postOpDirAttr);
}
/**
* Send a write response to the netty network socket channel
*/
public static void writeChannel(Channel channel, XDR out) {
ChannelBuffer outBuf = XDR.writeMessageTcp(out, true);
channel.write(outBuf);
}
private static boolean isSet(int access, int bits) {
return (access & bits) == bits;
}
public static int getAccessRights(int mode, int type) {
int rtn = 0;
if (isSet(mode, Nfs3Constant.ACCESS_MODE_READ)) {
rtn |= Nfs3Constant.ACCESS3_READ;
// LOOKUP is only meaningful for dir
if (type == NfsFileType.NFSDIR.toValue()) {
rtn |= Nfs3Constant.ACCESS3_LOOKUP;
}
}
if (isSet(mode, Nfs3Constant.ACCESS_MODE_WRITE)) {
rtn |= Nfs3Constant.ACCESS3_MODIFY;
rtn |= Nfs3Constant.ACCESS3_EXTEND;
// Set delete bit, UNIX may ignore it for regular file since it's up to
// parent dir op permission
rtn |= Nfs3Constant.ACCESS3_DELETE;
}
if (isSet(mode, Nfs3Constant.ACCESS_MODE_EXECUTE)) {
if (type == NfsFileType.NFSREG.toValue()) {
rtn |= Nfs3Constant.ACCESS3_EXECUTE;
}
}
return rtn;
}
public static int getAccessRightsForUserGroup(int uid, int gid,
Nfs3FileAttributes attr) {
int mode = attr.getMode();
if (uid == attr.getUid()) {
return getAccessRights(mode >> 6, attr.getType());
}
if (gid == attr.getGid()) {
return getAccessRights(mode >> 3, attr.getType());
}
return getAccessRights(mode, attr.getType());
}
public static long bytesToLong(byte[] data) {
long n = 0xffL & data[0];
for (int i = 1; i < 8; i++) {
n = (n << 8) | (0xffL & data[i]);
}
return n;
}
public static byte[] longToByte(long v) {
byte[] data = new byte[8];
data[0] = (byte) (v >>> 56);
data[1] = (byte) (v >>> 48);
data[2] = (byte) (v >>> 40);
data[3] = (byte) (v >>> 32);
data[4] = (byte) (v >>> 24);
data[5] = (byte) (v >>> 16);
data[6] = (byte) (v >>> 8);
data[7] = (byte) (v >>> 0);
return data;
}
}