kernel: Move GPL'd kernel files to sys/gnu to have them all in one place.
[dragonfly.git] / lib / libfsid / ext2.c
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c5b3c681
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1/*
2 * Copyright (c) 2010 The DragonFly Project. All rights reserved.
3 *
4 * This code is derived from software contributed to The DragonFly Project
1e642749 5 * by Ákos Kovács <akoskovacs@gmx.com>
c5b3c681
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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 */
24cad3d2 34
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35#include <gnu/vfs/ext2fs/ext2_fs.h>
36#include <gnu/vfs/ext2fs/fs.h>
c5b3c681 37
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38#include "libfsid.h"
39
1e642749 40static char buffer[sizeof(struct ext2_super_block)*2];
c5b3c681 41
24cad3d2 42fsid_t
1e642749 43ext2_probe(const char *dev)
c5b3c681 44{
1e642749 45 static struct ext2_super_block *fs;
c5b3c681 46
1e642749 47 if (fsid_dev_read(dev, SBOFF, sizeof(buffer), buffer) != 0)
24cad3d2 48 return FSID_UNKNOWN;
c5b3c681 49
1e642749 50 fs = (struct ext2_super_block *)&buffer;
c5b3c681 51
1e642749 52 if (fs->s_magic == EXT2_SUPER_MAGIC)
24cad3d2 53 return FSID_EXT2;
c5b3c681 54
24cad3d2 55 return FSID_UNKNOWN;
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56}
57
58char *
1e642749 59ext2_volname(const char *dev)
c5b3c681 60{
1e642749 61 static struct ext2_super_block *fs;
c5b3c681 62
1e642749 63 if (fsid_dev_read(dev, SBOFF, sizeof(buffer), buffer) != 0)
c5b3c681 64 return NULL;
c5b3c681 65
1e642749 66 fs = (struct ext2_super_block *)&buffer;
c5b3c681 67
24cad3d2 68 if (fs->s_magic != EXT2_SUPER_MAGIC || fs->s_volume_name[0] == '\0')
c5b3c681 69 return NULL;
c5b3c681 70
24cad3d2 71 fs->s_volume_name[sizeof(fs->s_volume_name) - 1] = '\0';
c5b3c681 72
24cad3d2 73 return fs->s_volume_name;
c5b3c681 74}