| /* |
| * Copyright (c) 2008, 2015, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package sun.nio.fs; |
| |
| import java.nio.file.*; |
| import java.nio.file.attribute.*; |
| import java.nio.channels.*; |
| import java.util.*; |
| import java.io.IOException; |
| import java.security.AccessController; |
| import java.security.PrivilegedAction; |
| |
| /** |
| * Base implementation of FileStore for Unix/like implementations. |
| */ |
| |
| abstract class UnixFileStore |
| extends FileStore |
| { |
| // original path of file that identified file system |
| private final UnixPath file; |
| |
| // device ID |
| private final long dev; |
| |
| // entry in the mount tab |
| private final UnixMountEntry entry; |
| |
| // return the device ID where the given file resides |
| private static long devFor(UnixPath file) throws IOException { |
| try { |
| return UnixFileAttributes.get(file, true).dev(); |
| } catch (UnixException x) { |
| x.rethrowAsIOException(file); |
| return 0L; // keep compiler happy |
| } |
| } |
| |
| UnixFileStore(UnixPath file) throws IOException { |
| this.file = file; |
| this.dev = devFor(file); |
| this.entry = findMountEntry(); |
| } |
| |
| UnixFileStore(UnixFileSystem fs, UnixMountEntry entry) throws IOException { |
| this.file = new UnixPath(fs, entry.dir()); |
| this.dev = (entry.dev() == 0L) ? devFor(this.file) : entry.dev(); |
| this.entry = entry; |
| } |
| |
| /** |
| * Find the mount entry for the file store |
| */ |
| abstract UnixMountEntry findMountEntry() throws IOException; |
| |
| UnixPath file() { |
| return file; |
| } |
| |
| long dev() { |
| return dev; |
| } |
| |
| UnixMountEntry entry() { |
| return entry; |
| } |
| |
| @Override |
| public String name() { |
| return entry.name(); |
| } |
| |
| @Override |
| public String type() { |
| return entry.fstype(); |
| } |
| |
| @Override |
| public boolean isReadOnly() { |
| return entry.isReadOnly(); |
| } |
| |
| // uses statvfs to read the file system information |
| private UnixFileStoreAttributes readAttributes() throws IOException { |
| try { |
| return UnixFileStoreAttributes.get(file); |
| } catch (UnixException x) { |
| x.rethrowAsIOException(file); |
| return null; // keep compile happy |
| } |
| } |
| |
| @Override |
| public long getTotalSpace() throws IOException { |
| UnixFileStoreAttributes attrs = readAttributes(); |
| return attrs.blockSize() * attrs.totalBlocks(); |
| } |
| |
| @Override |
| public long getUsableSpace() throws IOException { |
| UnixFileStoreAttributes attrs = readAttributes(); |
| return attrs.blockSize() * attrs.availableBlocks(); |
| } |
| |
| @Override |
| public long getUnallocatedSpace() throws IOException { |
| UnixFileStoreAttributes attrs = readAttributes(); |
| return attrs.blockSize() * attrs.freeBlocks(); |
| } |
| |
| @Override |
| public <V extends FileStoreAttributeView> V getFileStoreAttributeView(Class<V> view) |
| { |
| if (view == null) |
| throw new NullPointerException(); |
| return (V) null; |
| } |
| |
| @Override |
| public Object getAttribute(String attribute) throws IOException { |
| if (attribute.equals("totalSpace")) |
| return getTotalSpace(); |
| if (attribute.equals("usableSpace")) |
| return getUsableSpace(); |
| if (attribute.equals("unallocatedSpace")) |
| return getUnallocatedSpace(); |
| throw new UnsupportedOperationException("'" + attribute + "' not recognized"); |
| } |
| |
| @Override |
| public boolean supportsFileAttributeView(Class<? extends FileAttributeView> type) { |
| if (type == null) |
| throw new NullPointerException(); |
| if (type == BasicFileAttributeView.class) |
| return true; |
| if (type == PosixFileAttributeView.class || |
| type == FileOwnerAttributeView.class) |
| { |
| // lookup fstypes.properties |
| FeatureStatus status = checkIfFeaturePresent("posix"); |
| // assume supported if UNKNOWN |
| return (status != FeatureStatus.NOT_PRESENT); |
| } |
| return false; |
| } |
| |
| @Override |
| public boolean supportsFileAttributeView(String name) { |
| if (name.equals("basic") || name.equals("unix")) |
| return true; |
| if (name.equals("posix")) |
| return supportsFileAttributeView(PosixFileAttributeView.class); |
| if (name.equals("owner")) |
| return supportsFileAttributeView(FileOwnerAttributeView.class); |
| return false; |
| } |
| |
| @Override |
| public boolean equals(Object ob) { |
| if (ob == this) |
| return true; |
| if (!(ob instanceof UnixFileStore)) |
| return false; |
| UnixFileStore other = (UnixFileStore)ob; |
| return (this.dev == other.dev) && |
| Arrays.equals(this.entry.dir(), other.entry.dir()) && |
| this.entry.name().equals(other.entry.name()); |
| } |
| |
| @Override |
| public int hashCode() { |
| return (int)(dev ^ (dev >>> 32)) ^ Arrays.hashCode(entry.dir()); |
| } |
| |
| @Override |
| public String toString() { |
| StringBuilder sb = new StringBuilder(Util.toString(entry.dir())); |
| sb.append(" ("); |
| sb.append(entry.name()); |
| sb.append(")"); |
| return sb.toString(); |
| } |
| |
| // -- fstypes.properties -- |
| |
| private static final Object loadLock = new Object(); |
| private static volatile Properties props; |
| |
| enum FeatureStatus { |
| PRESENT, |
| NOT_PRESENT, |
| UNKNOWN; |
| } |
| |
| /** |
| * Returns status to indicate if file system supports a given feature |
| */ |
| FeatureStatus checkIfFeaturePresent(String feature) { |
| if (props == null) { |
| synchronized (loadLock) { |
| if (props == null) { |
| props = AccessController.doPrivileged( |
| new PrivilegedAction<>() { |
| @Override |
| public Properties run() { |
| return loadProperties(); |
| }}); |
| } |
| } |
| } |
| |
| String value = props.getProperty(type()); |
| if (value != null) { |
| String[] values = value.split("\\s"); |
| for (String s: values) { |
| s = s.trim().toLowerCase(); |
| if (s.equals(feature)) { |
| return FeatureStatus.PRESENT; |
| } |
| if (s.startsWith("no")) { |
| s = s.substring(2); |
| if (s.equals(feature)) { |
| return FeatureStatus.NOT_PRESENT; |
| } |
| } |
| } |
| } |
| return FeatureStatus.UNKNOWN; |
| } |
| |
| private static Properties loadProperties() { |
| Properties result = new Properties(); |
| String fstypes = System.getProperty("java.home") + "/lib/fstypes.properties"; |
| Path file = Paths.get(fstypes); |
| try { |
| try (ReadableByteChannel rbc = Files.newByteChannel(file)) { |
| result.load(Channels.newReader(rbc, "UTF-8")); |
| } |
| } catch (IOException x) { |
| } |
| return result; |
| } |
| } |