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/*
* Copyright 2016-2024 The OSHI Project Contributors
* SPDX-License-Identifier: MIT
*/
package oshi.software.os.linux;
import java.io.File;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.PathMatcher;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.sun.jna.Native;
import com.sun.jna.platform.linux.LibC;
import oshi.annotation.concurrent.ThreadSafe;
import oshi.software.common.AbstractFileSystem;
import oshi.software.os.OSFileStore;
import oshi.util.ExecutingCommand;
import oshi.util.FileSystemUtil;
import oshi.util.FileUtil;
import oshi.util.ParseUtil;
import oshi.util.platform.linux.DevPath;
import oshi.util.platform.linux.ProcPath;
/**
* The Linux File System contains {@link oshi.software.os.OSFileStore}s which are a storage pool, device, partition,
* volume, concrete file system or other implementation specific means of file storage. In Linux, these are found in the
* /proc/mount filesystem, excluding temporary and kernel mounts.
*/
@ThreadSafe
public class LinuxFileSystem extends AbstractFileSystem {
private static final Logger LOG = LoggerFactory.getLogger(LinuxFileSystem.class);
public static final String OSHI_LINUX_FS_PATH_EXCLUDES = "oshi.os.linux.filesystem.path.excludes";
public static final String OSHI_LINUX_FS_PATH_INCLUDES = "oshi.os.linux.filesystem.path.includes";
public static final String OSHI_LINUX_FS_VOLUME_EXCLUDES = "oshi.os.linux.filesystem.volume.excludes";
public static final String OSHI_LINUX_FS_VOLUME_INCLUDES = "oshi.os.linux.filesystem.volume.includes";
private static final List FS_PATH_EXCLUDES = FileSystemUtil
.loadAndParseFileSystemConfig(OSHI_LINUX_FS_PATH_EXCLUDES);
private static final List FS_PATH_INCLUDES = FileSystemUtil
.loadAndParseFileSystemConfig(OSHI_LINUX_FS_PATH_INCLUDES);
private static final List FS_VOLUME_EXCLUDES = FileSystemUtil
.loadAndParseFileSystemConfig(OSHI_LINUX_FS_VOLUME_EXCLUDES);
private static final List FS_VOLUME_INCLUDES = FileSystemUtil
.loadAndParseFileSystemConfig(OSHI_LINUX_FS_VOLUME_INCLUDES);
private static final String UNICODE_SPACE = "\\040";
@Override
public List getFileStores(boolean localOnly) {
// Map of volume with device path as key
Map volumeDeviceMap = new HashMap<>();
File devMapper = new File(DevPath.MAPPER);
File[] volumes = devMapper.listFiles();
if (volumes != null) {
for (File volume : volumes) {
try {
volumeDeviceMap.put(volume.getCanonicalPath(), volume.getAbsolutePath());
} catch (IOException e) {
LOG.error("Couldn't get canonical path for {}. {}", volume.getName(), e.getMessage());
}
}
}
// Map uuids with device path as key
Map uuidMap = new HashMap<>();
File uuidDir = new File(DevPath.DISK_BY_UUID);
File[] uuids = uuidDir.listFiles();
if (uuids != null) {
for (File uuid : uuids) {
try {
// Store UUID as value with path (e.g., /dev/sda1) and volumes as key
String canonicalPath = uuid.getCanonicalPath();
uuidMap.put(canonicalPath, uuid.getName().toLowerCase(Locale.ROOT));
if (volumeDeviceMap.containsKey(canonicalPath)) {
uuidMap.put(volumeDeviceMap.get(canonicalPath), uuid.getName().toLowerCase(Locale.ROOT));
}
} catch (IOException e) {
LOG.error("Couldn't get canonical path for {}. {}", uuid.getName(), e.getMessage());
}
}
}
// List file systems
return getFileStoreMatching(null, uuidMap, localOnly);
}
// called from LinuxOSFileStore
static List getFileStoreMatching(String nameToMatch, Map uuidMap) {
return getFileStoreMatching(nameToMatch, uuidMap, false);
}
private static List getFileStoreMatching(String nameToMatch, Map uuidMap,
boolean localOnly) {
List fsList = new ArrayList<>();
Map labelMap = queryLabelMap();
// Parse /proc/mounts to get fs types
List mounts = FileUtil.readFile(ProcPath.MOUNTS);
for (String mount : mounts) {
String[] split = mount.split(" ");
// As reported in fstab(5) manpage, struct is:
// 1st field is volume name
// 2nd field is path with spaces escaped as \040
// 3rd field is fs type
// 4th field is mount options
// 5th field is used by dump(8) (ignored)
// 6th field is fsck order (ignored)
if (split.length < 6) {
continue;
}
// Exclude pseudo file systems
String volume = split[0].replace(UNICODE_SPACE, " ");
String name = volume;
String path = split[1].replace(UNICODE_SPACE, " ");
if (path.equals("/")) {
name = "/";
}
String type = split[2];
// Skip non-local drives if requested, and exclude pseudo file systems
if ((localOnly && NETWORK_FS_TYPES.contains(type))
|| !path.equals("/") && (PSEUDO_FS_TYPES.contains(type) || FileSystemUtil.isFileStoreExcluded(path,
volume, FS_PATH_INCLUDES, FS_PATH_EXCLUDES, FS_VOLUME_INCLUDES, FS_VOLUME_EXCLUDES))) {
continue;
}
String options = split[3];
// If only updating for one name, skip others
if (nameToMatch != null && !nameToMatch.equals(name)) {
continue;
}
String uuid = uuidMap != null ? uuidMap.getOrDefault(split[0], "") : "";
String description;
if (volume.startsWith(DevPath.DEV)) {
description = "Local Disk";
} else if (volume.equals("tmpfs")) {
description = "Ram Disk";
} else if (NETWORK_FS_TYPES.contains(type)) {
description = "Network Disk";
} else {
description = "Mount Point";
}
// Add in logical volume found at /dev/mapper, useful when linking
// file system with drive.
String logicalVolume = "";
Path link = Paths.get(volume);
if (link.toFile().exists() && Files.isSymbolicLink(link)) {
try {
Path slink = Files.readSymbolicLink(link);
Path full = Paths.get(DevPath.MAPPER + slink.toString());
if (full.toFile().exists()) {
logicalVolume = full.normalize().toString();
}
} catch (IOException e) {
LOG.warn("Couldn't access symbolic path {}. {}", link, e.getMessage());
}
}
long totalInodes = 0L;
long freeInodes = 0L;
long totalSpace = 0L;
long usableSpace = 0L;
long freeSpace = 0L;
try {
LibC.Statvfs vfsStat = new LibC.Statvfs();
if (0 == LibC.INSTANCE.statvfs(path, vfsStat)) {
totalInodes = vfsStat.f_files.longValue();
freeInodes = vfsStat.f_ffree.longValue();
// Per stavfs, these units are in fragments
totalSpace = vfsStat.f_blocks.longValue() * vfsStat.f_frsize.longValue();
usableSpace = vfsStat.f_bavail.longValue() * vfsStat.f_frsize.longValue();
freeSpace = vfsStat.f_bfree.longValue() * vfsStat.f_frsize.longValue();
} else {
LOG.warn("Failed to get information to use statvfs. path: {}, Error code: {}", path,
Native.getLastError());
}
} catch (UnsatisfiedLinkError | NoClassDefFoundError e) {
LOG.error("Failed to get file counts from statvfs. {}", e.getMessage());
}
// If native methods failed use JVM methods
if (totalSpace == 0L) {
File tmpFile = new File(path);
totalSpace = tmpFile.getTotalSpace();
usableSpace = tmpFile.getUsableSpace();
freeSpace = tmpFile.getFreeSpace();
}
fsList.add(new LinuxOSFileStore(name, volume, labelMap.getOrDefault(path, name), path, options, uuid,
logicalVolume, description, type, freeSpace, usableSpace, totalSpace, freeInodes, totalInodes));
}
return fsList;
}
private static Map queryLabelMap() {
Map labelMap = new HashMap<>();
for (String line : ExecutingCommand.runNative("lsblk -o mountpoint,label")) {
String[] split = ParseUtil.whitespaces.split(line, 2);
if (split.length == 2) {
labelMap.put(split[0], split[1]);
}
}
return labelMap;
}
@Override
public long getOpenFileDescriptors() {
return getFileDescriptors(0);
}
@Override
public long getMaxFileDescriptors() {
return getFileDescriptors(2);
}
@Override
public long getMaxFileDescriptorsPerProcess() {
return getFileDescriptorsPerProcess();
}
/**
* Returns a value from the Linux system file /proc/sys/fs/file-nr.
*
* @param index The index of the value to retrieve. 0 returns the total allocated file descriptors. 1 returns the
* number of used file descriptors for kernel 2.4, or the number of unused file descriptors for kernel
* 2.6. 2 returns the maximum number of file descriptors that can be allocated.
* @return Corresponding file descriptor value from the Linux system file.
*/
private static long getFileDescriptors(int index) {
String filename = ProcPath.SYS_FS_FILE_NR;
if (index < 0 || index > 2) {
throw new IllegalArgumentException("Index must be between 0 and 2.");
}
List osDescriptors = FileUtil.readFile(filename);
if (!osDescriptors.isEmpty()) {
String[] splittedLine = osDescriptors.get(0).split("\\D+");
return ParseUtil.parseLongOrDefault(splittedLine[index], 0L);
}
return 0L;
}
private static long getFileDescriptorsPerProcess() {
return FileUtil.getLongFromFile(ProcPath.SYS_FS_FILE_MAX);
}
}
