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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).
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17  * You should have received a copy of the GNU General Public License version
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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 {
LinuxFileSystem(UnixFileSystemProvider provider, String dir)38     LinuxFileSystem(UnixFileSystemProvider provider, String dir) {
39         super(provider, dir);
40     }
41 
42     @Override
newWatchService()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();
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
supportedFileAttributeViews()66     public Set<String> supportedFileAttributeViews() {
67         return SupportedFileFileAttributeViewsHolder.supportedFileAttributeViews;
68     }
69 
70     @Override
copyNonPosixAttributes(int ofd, int nfd)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      */
getMountEntries(String fstab)78     List<UnixMountEntry> getMountEntries(String fstab) {
79         ArrayList<UnixMountEntry> entries = new ArrayList<>();
80         try {
81             long fp = setmntent(Util.toBytes(fstab), Util.toBytes("r"));
82             int maxLineSize = 1024;
83             try {
84                 for (;;) {
85                     int lineSize = getlinelen(fp);
86                     if (lineSize == -1)
87                         break;
88                     if (lineSize > maxLineSize)
89                         maxLineSize = lineSize;
90                 }
91             } catch (UnixException x) {
92                 // nothing we need to do
93             } finally {
94                 rewind(fp);
95             }
96 
97             try {
98                 for (;;) {
99                     UnixMountEntry entry = new UnixMountEntry();
100                     // count in NUL character at the end
101                     int res = getmntent(fp, entry, maxLineSize + 1);
102                     if (res < 0)
103                         break;
104                     entries.add(entry);
105                 }
106             } finally {
107                 endmntent(fp);
108             }
109 
110         } catch (UnixException x) {
111             // nothing we can do
112         }
113         return entries;
114     }
115 
116     /**
117      * Returns object to iterate over the mount entries in /etc/mtab
118      */
119     @Override
getMountEntries()120     List<UnixMountEntry> getMountEntries() {
121         return getMountEntries("/etc/mtab");
122     }
123 
124 
125 
126     @Override
getFileStore(UnixMountEntry entry)127     FileStore getFileStore(UnixMountEntry entry) throws IOException {
128         return new LinuxFileStore(this, entry);
129     }
130 }
131