author | bpb |
Fri, 01 Nov 2019 13:16:50 -0700 | |
changeset 58897 | 76638c631869 |
parent 50817 | fa1e04811ff6 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2008, 2019, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package sun.nio.fs; |
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import jdk.internal.util.StaticProperty; |
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import java.nio.file.*; |
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import java.nio.file.attribute.*; |
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import java.nio.channels.*; |
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import java.util.*; |
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import java.io.IOException; |
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import java.security.AccessController; |
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import java.security.PrivilegedAction; |
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/** |
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* Base implementation of FileStore for Unix/like implementations. |
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*/ |
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abstract class UnixFileStore |
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extends FileStore |
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{ |
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// original path of file that identified file system |
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private final UnixPath file; |
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// device ID |
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private final long dev; |
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// entry in the mount tab |
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private final UnixMountEntry entry; |
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// return the device ID where the given file resides |
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private static long devFor(UnixPath file) throws IOException { |
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try { |
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return UnixFileAttributes.get(file, true).dev(); |
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} catch (UnixException x) { |
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x.rethrowAsIOException(file); |
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return 0L; // keep compiler happy |
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} |
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} |
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UnixFileStore(UnixPath file) throws IOException { |
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this.file = file; |
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this.dev = devFor(file); |
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this.entry = findMountEntry(); |
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} |
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UnixFileStore(UnixFileSystem fs, UnixMountEntry entry) throws IOException { |
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this.file = new UnixPath(fs, entry.dir()); |
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this.dev = (entry.dev() == 0L) ? devFor(this.file) : entry.dev(); |
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this.entry = entry; |
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} |
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/** |
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* Find the mount entry for the file store |
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*/ |
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abstract UnixMountEntry findMountEntry() throws IOException; |
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UnixPath file() { |
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return file; |
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} |
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long dev() { |
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return dev; |
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} |
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UnixMountEntry entry() { |
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return entry; |
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} |
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@Override |
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public String name() { |
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return entry.name(); |
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} |
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@Override |
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public String type() { |
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return entry.fstype(); |
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} |
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@Override |
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public boolean isReadOnly() { |
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return entry.isReadOnly(); |
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} |
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// uses statvfs to read the file system information |
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private UnixFileStoreAttributes readAttributes() throws IOException { |
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try { |
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return UnixFileStoreAttributes.get(file); |
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} catch (UnixException x) { |
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x.rethrowAsIOException(file); |
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return null; // keep compile happy |
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} |
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} |
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@Override |
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public long getTotalSpace() throws IOException { |
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UnixFileStoreAttributes attrs = readAttributes(); |
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try { |
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return Math.multiplyExact(attrs.blockSize(), attrs.totalBlocks()); |
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} catch (ArithmeticException ignore) { |
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return Long.MAX_VALUE; |
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} |
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} |
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@Override |
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public long getUsableSpace() throws IOException { |
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UnixFileStoreAttributes attrs = readAttributes(); |
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try { |
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return Math.multiplyExact(attrs.blockSize(), attrs.availableBlocks()); |
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} catch (ArithmeticException ignore) { |
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return Long.MAX_VALUE; |
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} |
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} |
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|
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@Override |
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public long getUnallocatedSpace() throws IOException { |
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UnixFileStoreAttributes attrs = readAttributes(); |
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try { |
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return Math.multiplyExact(attrs.blockSize(), attrs.freeBlocks()); |
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} catch (ArithmeticException ignore) { |
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return Long.MAX_VALUE; |
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} |
8158 | 146 |
} |
147 |
||
148 |
@Override |
|
47428 | 149 |
public long getBlockSize() throws IOException { |
150 |
UnixFileStoreAttributes attrs = readAttributes(); |
|
151 |
return attrs.blockSize(); |
|
152 |
} |
|
153 |
||
154 |
@Override |
|
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public <V extends FileStoreAttributeView> V getFileStoreAttributeView(Class<V> view) |
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{ |
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if (view == null) |
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throw new NullPointerException(); |
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return (V) null; |
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} |
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161 |
|
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162 |
@Override |
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public Object getAttribute(String attribute) throws IOException { |
8158 | 164 |
if (attribute.equals("totalSpace")) |
165 |
return getTotalSpace(); |
|
166 |
if (attribute.equals("usableSpace")) |
|
167 |
return getUsableSpace(); |
|
168 |
if (attribute.equals("unallocatedSpace")) |
|
169 |
return getUnallocatedSpace(); |
|
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throw new UnsupportedOperationException("'" + attribute + "' not recognized"); |
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} |
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172 |
|
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173 |
@Override |
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public boolean supportsFileAttributeView(Class<? extends FileAttributeView> type) { |
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if (type == null) |
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throw new NullPointerException(); |
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if (type == BasicFileAttributeView.class) |
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return true; |
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if (type == PosixFileAttributeView.class || |
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type == FileOwnerAttributeView.class) |
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{ |
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// lookup fstypes.properties |
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FeatureStatus status = checkIfFeaturePresent("posix"); |
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// assume supported if UNKNOWN |
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return (status != FeatureStatus.NOT_PRESENT); |
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} |
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return false; |
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188 |
} |
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|
189 |
|
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190 |
@Override |
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191 |
public boolean supportsFileAttributeView(String name) { |
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192 |
if (name.equals("basic") || name.equals("unix")) |
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193 |
return true; |
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194 |
if (name.equals("posix")) |
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195 |
return supportsFileAttributeView(PosixFileAttributeView.class); |
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|
196 |
if (name.equals("owner")) |
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|
197 |
return supportsFileAttributeView(FileOwnerAttributeView.class); |
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|
198 |
return false; |
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|
199 |
} |
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|
200 |
|
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|
201 |
@Override |
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202 |
public boolean equals(Object ob) { |
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|
203 |
if (ob == this) |
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|
204 |
return true; |
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|
205 |
if (!(ob instanceof UnixFileStore)) |
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|
206 |
return false; |
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|
207 |
UnixFileStore other = (UnixFileStore)ob; |
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|
208 |
return (this.dev == other.dev) && |
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|
209 |
Arrays.equals(this.entry.dir(), other.entry.dir()) && |
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|
210 |
this.entry.name().equals(other.entry.name()); |
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211 |
} |
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|
212 |
|
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|
213 |
@Override |
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|
214 |
public int hashCode() { |
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215 |
return (int)(dev ^ (dev >>> 32)) ^ Arrays.hashCode(entry.dir()); |
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|
216 |
} |
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217 |
|
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|
218 |
@Override |
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219 |
public String toString() { |
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|
220 |
StringBuilder sb = new StringBuilder(Util.toString(entry.dir())); |
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|
221 |
sb.append(" ("); |
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|
222 |
sb.append(entry.name()); |
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|
223 |
sb.append(")"); |
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|
224 |
return sb.toString(); |
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|
225 |
} |
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226 |
|
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|
227 |
// -- fstypes.properties -- |
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228 |
|
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|
229 |
private static final Object loadLock = new Object(); |
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|
230 |
private static volatile Properties props; |
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|
231 |
|
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|
232 |
enum FeatureStatus { |
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|
233 |
PRESENT, |
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|
234 |
NOT_PRESENT, |
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|
235 |
UNKNOWN; |
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|
236 |
} |
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|
237 |
|
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|
238 |
/** |
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|
239 |
* Returns status to indicate if file system supports a given feature |
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|
240 |
*/ |
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|
241 |
FeatureStatus checkIfFeaturePresent(String feature) { |
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|
242 |
if (props == null) { |
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243 |
synchronized (loadLock) { |
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|
244 |
if (props == null) { |
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|
245 |
props = AccessController.doPrivileged( |
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|
246 |
new PrivilegedAction<>() { |
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247 |
@Override |
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248 |
public Properties run() { |
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249 |
return loadProperties(); |
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|
250 |
}}); |
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|
251 |
} |
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|
252 |
} |
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253 |
} |
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254 |
|
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|
255 |
String value = props.getProperty(type()); |
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|
256 |
if (value != null) { |
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|
257 |
String[] values = value.split("\\s"); |
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258 |
for (String s: values) { |
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|
259 |
s = s.trim().toLowerCase(); |
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|
260 |
if (s.equals(feature)) { |
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|
261 |
return FeatureStatus.PRESENT; |
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|
262 |
} |
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if (s.startsWith("no")) { |
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s = s.substring(2); |
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if (s.equals(feature)) { |
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return FeatureStatus.NOT_PRESENT; |
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} |
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268 |
} |
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269 |
} |
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} |
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return FeatureStatus.UNKNOWN; |
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} |
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273 |
|
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274 |
private static Properties loadProperties() { |
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Properties result = new Properties(); |
50817
fa1e04811ff6
8066709: Make some JDK system properties read only
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String fstypes = StaticProperty.javaHome() + "/lib/fstypes.properties"; |
49285
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8194746: (fs) Add equivalents of Paths.get to Path interface
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Path file = Path.of(fstypes); |
2057
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try { |
8158 | 279 |
try (ReadableByteChannel rbc = Files.newByteChannel(file)) { |
2057
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result.load(Channels.newReader(rbc, "UTF-8")); |
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} |
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} catch (IOException x) { |
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} |
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return result; |
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285 |
} |
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} |