1 /*
2 * Copyright (c) 2010 The DragonFly Project. All rights reserved.
3 *
4 * This code is derived from software contributed to The DragonFly Project
5 * by Ákos Kovács <akoskovacs@gmx.com>
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
16 * distribution.
17 * 3. Neither the name of The DragonFly Project nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific, prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35 #include "libfsid.h"
36
37 #include <vfs/ext2fs/ext2fs.h>
38 #include <vfs/ext2fs/fs.h>
39
40 /*
41 * struct ext2fs is actually ext4 compatible,
42 * whereas it used to be using the real ext2 superblock struct.
43 */
44 static char buffer[sizeof(struct ext2fs)*2];
45
46 fsid_t
ext2_probe(const char * dev)47 ext2_probe(const char *dev)
48 {
49 static struct ext2fs *fs;
50
51 if (fsid_dev_read(dev, SBOFF, sizeof(buffer), buffer) != 0)
52 return FSID_UNKNOWN;
53
54 fs = (struct ext2fs *)&buffer;
55
56 if (fs->e2fs_magic == E2FS_MAGIC)
57 return FSID_EXT2;
58
59 return FSID_UNKNOWN;
60 }
61
62 char *
ext2_volname(const char * dev)63 ext2_volname(const char *dev)
64 {
65 static struct ext2fs *fs;
66
67 if (fsid_dev_read(dev, SBOFF, sizeof(buffer), buffer) != 0)
68 return NULL;
69
70 fs = (struct ext2fs *)&buffer;
71
72 if (fs->e2fs_magic != E2FS_MAGIC || fs->e2fs_vname[0] == '\0')
73 return NULL;
74
75 fs->e2fs_vname[sizeof(fs->e2fs_vname) - 1] = '\0';
76
77 return fs->e2fs_vname;
78 }
79