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Elasticsearch subproject :server
/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch 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.elasticsearch.env;
import org.apache.lucene.util.Constants;
import org.elasticsearch.common.SuppressForbidden;
import org.elasticsearch.common.io.PathUtils;
import java.io.IOException;
import java.nio.file.FileStore;
import java.nio.file.FileSystemException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.attribute.FileAttributeView;
import java.nio.file.attribute.FileStoreAttributeView;
import java.util.Arrays;
import java.util.List;
/**
* Implementation of FileStore that supports
* additional features, such as SSD detection and better
* filesystem information for the root filesystem.
* @see Environment#getFileStore(Path)
*/
class ESFileStore extends FileStore {
/** Underlying filestore */
final FileStore in;
private int majorDeviceNumber;
private int minorDeviceNumber;
@SuppressForbidden(reason = "tries to determine if disk is spinning")
// TODO: move PathUtils to be package-private here instead of
// public+forbidden api!
ESFileStore(final FileStore in) {
this.in = in;
if (Constants.LINUX) {
try {
final List lines = Files.readAllLines(PathUtils.get("/proc/self/mountinfo"));
for (final String line : lines) {
final String[] fields = line.trim().split("\\s+");
final String mountPoint = fields[4];
if (mountPoint.equals(getMountPointLinux(in))) {
final String[] deviceNumbers = fields[2].split(":");
majorDeviceNumber = Integer.parseInt(deviceNumbers[0]);
minorDeviceNumber = Integer.parseInt(deviceNumbers[1]);
break;
}
}
} catch (final Exception e) {
majorDeviceNumber = -1;
minorDeviceNumber = -1;
}
} else {
majorDeviceNumber = -1;
minorDeviceNumber = -1;
}
}
// these are hacks that are not guaranteed
private static String getMountPointLinux(final FileStore store) {
String desc = store.toString();
int index = desc.lastIndexOf(" (");
if (index != -1) {
return desc.substring(0, index);
} else {
return desc;
}
}
@Override
public String name() {
return in.name();
}
@Override
public String type() {
return in.type();
}
@Override
public boolean isReadOnly() {
return in.isReadOnly();
}
@Override
public long getTotalSpace() throws IOException {
long result = in.getTotalSpace();
if (result < 0) {
// see https://bugs.openjdk.java.net/browse/JDK-8162520:
result = Long.MAX_VALUE;
}
return result;
}
@Override
public long getUsableSpace() throws IOException {
long result = in.getUsableSpace();
if (result < 0) {
// see https://bugs.openjdk.java.net/browse/JDK-8162520:
result = Long.MAX_VALUE;
}
return result;
}
@Override
public long getUnallocatedSpace() throws IOException {
long result = in.getUnallocatedSpace();
if (result < 0) {
// see https://bugs.openjdk.java.net/browse/JDK-8162520:
result = Long.MAX_VALUE;
}
return result;
}
@Override
public boolean supportsFileAttributeView(Class type) {
return in.supportsFileAttributeView(type);
}
@Override
public boolean supportsFileAttributeView(String name) {
if ("lucene".equals(name)) {
return true;
} else {
return in.supportsFileAttributeView(name);
}
}
@Override
public V getFileStoreAttributeView(Class type) {
return in.getFileStoreAttributeView(type);
}
@Override
public Object getAttribute(String attribute) throws IOException {
switch(attribute) {
// for the partition
case "lucene:major_device_number": return majorDeviceNumber;
case "lucene:minor_device_number": return minorDeviceNumber;
default: return in.getAttribute(attribute);
}
}
@Override
public String toString() {
return in.toString();
}
}