1 /*
2 * volume_id - reads filesystem label and uuid
3 *
4 * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation version 2 of the License.
9 */
10
11 #ifndef _GNU_SOURCE
12 #define _GNU_SOURCE 1
13 #endif
14
15 #ifdef HAVE_CONFIG_H
16 # include <config.h>
17 #endif
18
19 #include <stdio.h>
20 #include <stdlib.h>
21 #include <unistd.h>
22 #include <string.h>
23 #include <errno.h>
24 #include <ctype.h>
25
26 #include "libvolume_id.h"
27 #include "util.h"
28
29 struct jfs_super_block {
30 uint8_t magic[4];
31 uint32_t version;
32 uint64_t size;
33 uint32_t bsize;
34 uint32_t dummy1;
35 uint32_t pbsize;
36 uint32_t dummy2[27];
37 uint8_t uuid[16];
38 uint8_t label[16];
39 uint8_t loguuid[16];
40 } PACKED;
41
42 #define JFS_SUPERBLOCK_OFFSET 0x8000
43
volume_id_probe_jfs(struct volume_id * id,uint64_t off,uint64_t size)44 int volume_id_probe_jfs(struct volume_id *id, uint64_t off, uint64_t size)
45 {
46 struct jfs_super_block *js;
47
48 info("probing at offset 0x%llx", (unsigned long long) off);
49
50 js = (struct jfs_super_block *) volume_id_get_buffer(id, off + JFS_SUPERBLOCK_OFFSET, 0x200);
51 if (js == NULL)
52 return -1;
53
54 if (memcmp(js->magic, "JFS1", 4) != 0)
55 return -1;
56
57 volume_id_set_label_raw(id, js->label, 16);
58 volume_id_set_label_string(id, js->label, 16);
59 volume_id_set_uuid(id, js->uuid, 0, UUID_DCE);
60
61 volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
62 id->type = "jfs";
63
64 return 0;
65 }
66