1 /*
   2  * Copyright (c) 2008, 2012, 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.attribute.*;
  29 import java.util.*;
  30 import java.io.IOException;
  31 
  32 /**
  33  * Bsd implementation of FileStore
  34  */
  35 
  36 class BsdFileStore
  37     extends UnixFileStore
  38 {
  39     BsdFileStore(UnixPath file) throws IOException {
  40         super(file);
  41     }
  42 
  43     BsdFileStore(UnixFileSystem fs, UnixMountEntry entry) throws IOException {
  44         super(fs, entry);
  45     }
  46 
  47     /**
  48      * Finds, and returns, the mount entry for the file system where the file
  49      * resides.
  50      */
  51     @Override
  52     UnixMountEntry findMountEntry() throws IOException {
  53         UnixFileSystem fs = file().getFileSystem();
  54 
  55         // step 1: get realpath
  56         UnixPath path = null;
  57         try {
  58             byte[] rp = UnixNativeDispatcher.realpath(file());
  59             path = new UnixPath(fs, rp);
  60         } catch (UnixException x) {
  61             x.rethrowAsIOException(file());
  62         }
  63 
  64         // step 2: find mount point
  65         UnixPath parent = path.getParent();
  66         while (parent != null) {
  67             UnixFileAttributes attrs = null;
  68             try {
  69                 attrs = UnixFileAttributes.get(parent, true);
  70             } catch (UnixException x) {
  71                 x.rethrowAsIOException(parent);
  72             }
  73             if (attrs.dev() != dev())
  74                 break;
  75             path = parent;
  76             parent = parent.getParent();
  77         }
  78 
  79         // step 3: lookup mounted file systems
  80         byte[] dir = path.asByteArray();
  81         for (UnixMountEntry entry: fs.getMountEntries()) {
  82             if (Arrays.equals(dir, entry.dir()))
  83                 return entry;
  84         }
  85 
  86         throw new IOException("Mount point not found in fstab");
  87     }
  88 }