LinuxFileSystem.java revision a5aad954b0f024ddd76dede5df2aead2e11a5384 
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
26package sun.nio.fs;
27
28import java.nio.file.*;
29import java.io.IOException;
30import java.util.*;
31import static sun.nio.fs.LinuxNativeDispatcher.*;
32
33/**
34 * Linux implementation of FileSystem
35 */
36
37class 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