1 /* 2 * Copyright (c) 2008, 2015, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package sun.nio.fs; 27 28 import java.nio.file.*; 29 import java.nio.file.attribute.*; 30 import java.nio.channels.*; 31 import java.util.*; 32 import java.io.IOException; 33 import java.security.AccessController; 34 import java.security.PrivilegedAction; 35 36 /** 37 * Base implementation of FileStore for Unix/like implementations. 38 */ 39 40 abstract class UnixFileStore 41 extends FileStore 42 { 43 // original path of file that identified file system 44 private final UnixPath file; 45 46 // device ID 47 private final long dev; 48 49 // entry in the mount tab 50 private final UnixMountEntry entry; 51 52 // return the device ID where the given file resides devFor(UnixPath file)53 private static long devFor(UnixPath file) throws IOException { 54 try { 55 return UnixFileAttributes.get(file, true).dev(); 56 } catch (UnixException x) { 57 x.rethrowAsIOException(file); 58 return 0L; // keep compiler happy 59 } 60 } 61 UnixFileStore(UnixPath file)62 UnixFileStore(UnixPath file) throws IOException { 63 this.file = file; 64 this.dev = devFor(file); 65 this.entry = findMountEntry(); 66 } 67 UnixFileStore(UnixFileSystem fs, UnixMountEntry entry)68 UnixFileStore(UnixFileSystem fs, UnixMountEntry entry) throws IOException { 69 this.file = new UnixPath(fs, entry.dir()); 70 this.dev = (entry.dev() == 0L) ? devFor(this.file) : entry.dev(); 71 this.entry = entry; 72 } 73 74 /** 75 * Find the mount entry for the file store 76 */ findMountEntry()77 abstract UnixMountEntry findMountEntry() throws IOException; 78 file()79 UnixPath file() { 80 return file; 81 } 82 dev()83 long dev() { 84 return dev; 85 } 86 entry()87 UnixMountEntry entry() { 88 return entry; 89 } 90 91 @Override name()92 public String name() { 93 return entry.name(); 94 } 95 96 @Override type()97 public String type() { 98 return entry.fstype(); 99 } 100 101 @Override isReadOnly()102 public boolean isReadOnly() { 103 return entry.isReadOnly(); 104 } 105 106 // uses statvfs to read the file system information readAttributes()107 private UnixFileStoreAttributes readAttributes() throws IOException { 108 try { 109 return UnixFileStoreAttributes.get(file); 110 } catch (UnixException x) { 111 x.rethrowAsIOException(file); 112 return null; // keep compile happy 113 } 114 } 115 116 @Override getTotalSpace()117 public long getTotalSpace() throws IOException { 118 UnixFileStoreAttributes attrs = readAttributes(); 119 return attrs.blockSize() * attrs.totalBlocks(); 120 } 121 122 @Override getUsableSpace()123 public long getUsableSpace() throws IOException { 124 UnixFileStoreAttributes attrs = readAttributes(); 125 return attrs.blockSize() * attrs.availableBlocks(); 126 } 127 128 @Override getUnallocatedSpace()129 public long getUnallocatedSpace() throws IOException { 130 UnixFileStoreAttributes attrs = readAttributes(); 131 return attrs.blockSize() * attrs.freeBlocks(); 132 } 133 134 @Override getFileStoreAttributeView(Class<V> view)135 public <V extends FileStoreAttributeView> V getFileStoreAttributeView(Class<V> view) 136 { 137 if (view == null) 138 throw new NullPointerException(); 139 return (V) null; 140 } 141 142 @Override getAttribute(String attribute)143 public Object getAttribute(String attribute) throws IOException { 144 if (attribute.equals("totalSpace")) 145 return getTotalSpace(); 146 if (attribute.equals("usableSpace")) 147 return getUsableSpace(); 148 if (attribute.equals("unallocatedSpace")) 149 return getUnallocatedSpace(); 150 throw new UnsupportedOperationException("'" + attribute + "' not recognized"); 151 } 152 153 @Override supportsFileAttributeView(Class<? extends FileAttributeView> type)154 public boolean supportsFileAttributeView(Class<? extends FileAttributeView> type) { 155 if (type == null) 156 throw new NullPointerException(); 157 if (type == BasicFileAttributeView.class) 158 return true; 159 if (type == PosixFileAttributeView.class || 160 type == FileOwnerAttributeView.class) 161 { 162 // lookup fstypes.properties 163 FeatureStatus status = checkIfFeaturePresent("posix"); 164 // assume supported if UNKNOWN 165 return (status != FeatureStatus.NOT_PRESENT); 166 } 167 return false; 168 } 169 170 @Override supportsFileAttributeView(String name)171 public boolean supportsFileAttributeView(String name) { 172 if (name.equals("basic") || name.equals("unix")) 173 return true; 174 if (name.equals("posix")) 175 return supportsFileAttributeView(PosixFileAttributeView.class); 176 if (name.equals("owner")) 177 return supportsFileAttributeView(FileOwnerAttributeView.class); 178 return false; 179 } 180 181 @Override equals(Object ob)182 public boolean equals(Object ob) { 183 if (ob == this) 184 return true; 185 if (!(ob instanceof UnixFileStore)) 186 return false; 187 UnixFileStore other = (UnixFileStore)ob; 188 return (this.dev == other.dev) && 189 Arrays.equals(this.entry.dir(), other.entry.dir()) && 190 this.entry.name().equals(other.entry.name()); 191 } 192 193 @Override hashCode()194 public int hashCode() { 195 return (int)(dev ^ (dev >>> 32)) ^ Arrays.hashCode(entry.dir()); 196 } 197 198 @Override toString()199 public String toString() { 200 StringBuilder sb = new StringBuilder(Util.toString(entry.dir())); 201 sb.append(" ("); 202 sb.append(entry.name()); 203 sb.append(")"); 204 return sb.toString(); 205 } 206 207 // -- fstypes.properties -- 208 209 private static final Object loadLock = new Object(); 210 private static volatile Properties props; 211 212 enum FeatureStatus { 213 PRESENT, 214 NOT_PRESENT, 215 UNKNOWN; 216 } 217 218 /** 219 * Returns status to indicate if file system supports a given feature 220 */ checkIfFeaturePresent(String feature)221 FeatureStatus checkIfFeaturePresent(String feature) { 222 if (props == null) { 223 synchronized (loadLock) { 224 if (props == null) { 225 props = AccessController.doPrivileged( 226 new PrivilegedAction<Properties>() { 227 @Override 228 public Properties run() { 229 return loadProperties(); 230 }}); 231 } 232 } 233 } 234 235 String value = props.getProperty(type()); 236 if (value != null) { 237 String[] values = value.split("\\s"); 238 for (String s: values) { 239 s = s.trim().toLowerCase(); 240 if (s.equals(feature)) { 241 return FeatureStatus.PRESENT; 242 } 243 if (s.startsWith("no")) { 244 s = s.substring(2); 245 if (s.equals(feature)) { 246 return FeatureStatus.NOT_PRESENT; 247 } 248 } 249 } 250 } 251 return FeatureStatus.UNKNOWN; 252 } 253 loadProperties()254 private static Properties loadProperties() { 255 Properties result = new Properties(); 256 String fstypes = System.getProperty("java.home") + "/lib/fstypes.properties"; 257 Path file = Paths.get(fstypes); 258 try { 259 try (ReadableByteChannel rbc = Files.newByteChannel(file)) { 260 result.load(Channels.newReader(rbc, "UTF-8")); 261 } 262 } catch (IOException x) { 263 } 264 return result; 265 } 266 } 267