1 /* 2 * Copyright (c) 2008, 2013, 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 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 62 UnixFileStore(UnixPath file) throws IOException { 63 this.file = file; 64 this.dev = devFor(file); 65 this.entry = findMountEntry(); 66 } 67 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 */ 77 abstract UnixMountEntry findMountEntry() throws IOException; 78 79 UnixPath file() { 80 return file; 81 } 82 83 long dev() { 84 return dev; 85 } 86 87 UnixMountEntry entry() { 88 return entry; 89 } 90 91 @Override 92 public String name() { 93 return entry.name(); 94 } 95 96 @Override 97 public String type() { 98 return entry.fstype(); 99 } 100 101 @Override 102 public boolean isReadOnly() { 103 return entry.isReadOnly(); 104 } 105 106 // uses statvfs to read the file system information 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 117 public long getTotalSpace() throws IOException { 118 UnixFileStoreAttributes attrs = readAttributes(); 119 return attrs.blockSize() * attrs.totalBlocks(); 120 } 121 122 @Override 123 public long getUsableSpace() throws IOException { 124 UnixFileStoreAttributes attrs = readAttributes(); 125 return attrs.blockSize() * attrs.availableBlocks(); 126 } 127 128 @Override 129 public long getUnallocatedSpace() throws IOException { 130 UnixFileStoreAttributes attrs = readAttributes(); 131 return attrs.blockSize() * attrs.freeBlocks(); 132 } 133 134 @Override 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 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 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 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 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 } 191 192 @Override 193 public int hashCode() { 194 return (int)(dev ^ (dev >>> 32)) ^ Arrays.hashCode(entry.dir()); 195 } 196 197 @Override 198 public String toString() { 199 StringBuilder sb = new StringBuilder(Util.toString(entry.dir())); 200 sb.append(" ("); 201 sb.append(entry.name()); 202 sb.append(")"); 203 return sb.toString(); 204 } 205 206 // -- fstypes.properties -- 207 208 private static final Object loadLock = new Object(); 209 private static volatile Properties props; 210 211 enum FeatureStatus { 212 PRESENT, 213 NOT_PRESENT, 214 UNKNOWN; 215 } 216 217 /** 218 * Returns status to indicate if file system supports a given feature 219 */ 220 FeatureStatus checkIfFeaturePresent(String feature) { 221 if (props == null) { 222 synchronized (loadLock) { 223 if (props == null) { 224 props = AccessController.doPrivileged( 225 new PrivilegedAction<Properties>() { 226 @Override 227 public Properties run() { 228 return loadProperties(); 229 }}); 230 } 231 } 232 } 233 234 String value = props.getProperty(type()); 235 if (value != null) { 236 String[] values = value.split("\\s"); 237 for (String s: values) { 238 s = s.trim().toLowerCase(); 239 if (s.equals(feature)) { 240 return FeatureStatus.PRESENT; 241 } 242 if (s.startsWith("no")) { 243 s = s.substring(2); 244 if (s.equals(feature)) { 245 return FeatureStatus.NOT_PRESENT; 246 } 247 } 248 } 249 } 250 return FeatureStatus.UNKNOWN; 251 } 252 253 private static Properties loadProperties() { 254 Properties result = new Properties(); 255 String fstypes = System.getProperty("java.home") + "/lib/fstypes.properties"; 256 Path file = Paths.get(fstypes); 257 try { 258 try (ReadableByteChannel rbc = Files.newByteChannel(file)) { 259 result.load(Channels.newReader(rbc, "UTF-8")); 260 } 261 } catch (IOException x) { 262 } 263 return result; 264 } 265 } 266
