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      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.io.IOException;
     30 import java.util.*;
     31 import static sun.nio.fs.LinuxNativeDispatcher.*;
     32 
     33 /**
     34  * Linux implementation of FileSystem
     35  */
     36 
     37 class LinuxFileSystem extends UnixFileSystem {
     38     LinuxFileSystem(UnixFileSystemProvider provider, String dir) {
     39         super(provider, dir);
     40     }
     41 
     42     @Override
     43     public WatchService newWatchService()
     44         throws IOException
     45     {
     46         // assume 2.6.13 or newer
     47         return new LinuxWatchService(this);
     48     }
     49 
     50 
     51     // lazy initialization of the list of supported attribute views
     52     private static class SupportedFileFileAttributeViewsHolder {
     53         static final Set<String> supportedFileAttributeViews =
     54             supportedFileAttributeViews();
     55         private static Set<String> supportedFileAttributeViews() {
     56             Set<String> result = new HashSet<>();
     57             result.addAll(standardFileAttributeViews());
     58             // additional Linux-specific views
     59             result.add("dos");
     60             result.add("user");
     61             return Collections.unmodifiableSet(result);
     62         }
     63     }
     64 
     65     @Override
     66     public Set<String> supportedFileAttributeViews() {
     67         return SupportedFileFileAttributeViewsHolder.supportedFileAttributeViews;
     68     }
     69 
     70     @Override
     71     void copyNonPosixAttributes(int ofd, int nfd) {
     72         LinuxUserDefinedFileAttributeView.copyExtendedAttributes(ofd, nfd);
     73     }
     74 
     75     /**
     76      * Returns object to iterate over the mount entries in the given fstab file.
     77      */
     78     Iterable<UnixMountEntry> getMountEntries(String fstab) {
     79         ArrayList<UnixMountEntry> entries = new ArrayList<>();
     80         try {
     81             long fp = setmntent(Util.toBytes(fstab), Util.toBytes("r"));
     82             try {
     83                 for (;;) {
     84                     UnixMountEntry entry = new UnixMountEntry();
     85                     int res = getmntent(fp, entry);
     86                     if (res < 0)
     87                         break;
     88                     entries.add(entry);
     89                 }
     90             } finally {
     91                 endmntent(fp);
     92             }
     93 
     94         } catch (UnixException x) {
     95             // nothing we can do
     96         }
     97         return entries;
     98     }
     99 
    100     /**
    101      * Returns object to iterate over the mount entries in /etc/mtab
    102      */
    103     @Override
    104     Iterable<UnixMountEntry> getMountEntries() {
    105         // Android-changed: As /etc/mtab is not available in Android, therefore, using /proc/mounts
    106         // instead.
    107         return getMountEntries("/proc/mounts");
    108     }
    109 
    110 
    111 
    112     @Override
    113     FileStore getFileStore(UnixMountEntry entry) throws IOException {
    114         return new LinuxFileStore(this, entry);
    115     }
    116 }
    117