1 /*-
2 * Copyright (c) 2005 Stanislav Sedov
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
29
30 #include <sys/param.h>
31 #include <sys/systm.h>
32 #include <sys/kernel.h>
33 #include <sys/malloc.h>
34
35 #include <geom/geom.h>
36 #include <geom/label/g_label.h>
37
38 #define EXT2FS_SB_OFFSET 1024
39 #define EXT2_SUPER_MAGIC 0xef53
40 #define EXT2_DYNAMIC_REV 1
41
42 typedef struct e2sb {
43 uint8_t fake1[56];
44 uint16_t s_magic;
45 uint8_t fake2[18];
46 uint32_t s_rev_level;
47 uint8_t fake3[40];
48 char s_volume_name[16];
49 } e2sb_t;
50
51 static void
52 g_label_ext2fs_taste(struct g_consumer *cp, char *label, size_t size)
53 {
54 struct g_provider *pp;
55 e2sb_t *fs;
56
57 g_topology_assert_not();
58 pp = cp->provider;
59 label[0] = '\0';
60
61 if ((EXT2FS_SB_OFFSET % pp->sectorsize) != 0)
62 return;
63
64 fs = (e2sb_t *)g_read_data(cp, EXT2FS_SB_OFFSET, pp->sectorsize, NULL);
65 if (fs == NULL)
66 return;
67
68 /* Check for magic and versio n*/
69 if (fs->s_magic == EXT2_SUPER_MAGIC &&
70 fs->s_rev_level == EXT2_DYNAMIC_REV) {
71 G_LABEL_DEBUG(1, "ext2fs file system detected on %s.",
72 pp->name);
73 } else {
74 goto exit_free;
75 }
76
77 /* Check for volume label */
78 if (fs->s_volume_name[0] == '\0')
79 goto exit_free;
80
81 /* Terminate label */
82 fs->s_volume_name[sizeof(fs->s_volume_name) - 1] = '\0';
83 strlcpy(label, fs->s_volume_name, size);
84
85 exit_free:
86 g_free(fs);
87 }
88
89 const struct g_label_desc g_label_ext2fs = {
90 .ld_taste = g_label_ext2fs_taste,
91 .ld_dir = "ext2fs"
92 };
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