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
26package sun.nio.fs;
27
28import java.nio.file.attribute.*;
29import java.util.*;
30import java.io.IOException;
31
32/**
33 * Bsd implementation of FileStore
34 */
35
36class 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}
89