blob: ac684d8cd75cee51518cd702c523d91be808ccc0 [file] [log] [blame]
bigbiff bigbiffe60683a2013-02-22 20:55:50 -05001/*
2 * Copyright (C) 1999 by Andries Brouwer
3 * Copyright (C) 1999, 2000, 2003 by Theodore Ts'o
4 * Copyright (C) 2001 by Andreas Dilger
5 * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
6 * Copyright (C) 2008 Karel Zak <kzak@redhat.com>
7 *
8 * This file may be redistributed under the terms of the
9 * GNU Lesser General Public License.
10 */
11#include <stdio.h>
12#include <stdlib.h>
13#include <unistd.h>
14#include <string.h>
15#include <errno.h>
16#include <ctype.h>
17#include <stdint.h>
18
19#include "superblocks.h"
20
21struct jfs_super_block {
22 unsigned char js_magic[4];
23 uint32_t js_version;
24 uint64_t js_size;
25 uint32_t js_bsize; /* 4: aggregate block size in bytes */
26 uint16_t js_l2bsize; /* 2: log2 of s_bsize */
27 uint16_t js_l2bfactor; /* 2: log2(s_bsize/hardware block size) */
28 uint32_t js_pbsize; /* 4: hardware/LVM block size in bytes */
29 uint16_t js_l2pbsize; /* 2: log2 of s_pbsize */
30 uint16_t js_pad; /* 2: padding necessary for alignment */
31 uint32_t js_dummy2[26];
32 unsigned char js_uuid[16];
33 unsigned char js_label[16];
34 unsigned char js_loguuid[16];
35};
36
37static int probe_jfs(blkid_probe pr, const struct blkid_idmag *mag)
38{
39 struct jfs_super_block *js;
40
41 js = blkid_probe_get_sb(pr, mag, struct jfs_super_block);
42 if (!js)
bigbiff7b4c7a62015-01-01 19:44:14 -050043 return errno ? -errno : 1;
bigbiff bigbiffe60683a2013-02-22 20:55:50 -050044 if (le32_to_cpu(js->js_bsize) != (1U << le16_to_cpu(js->js_l2bsize)))
45 return 1;
46 if (le32_to_cpu(js->js_pbsize) != (1U << le16_to_cpu(js->js_l2pbsize)))
47 return 1;
48 if ((le16_to_cpu(js->js_l2bsize) - le16_to_cpu(js->js_l2pbsize)) !=
49 le16_to_cpu(js->js_l2bfactor))
50 return 1;
51
52 if (strlen((char *) js->js_label))
53 blkid_probe_set_label(pr, js->js_label, sizeof(js->js_label));
54 blkid_probe_set_uuid(pr, js->js_uuid);
55 return 0;
56}
57
58
59const struct blkid_idinfo jfs_idinfo =
60{
61 .name = "jfs",
62 .usage = BLKID_USAGE_FILESYSTEM,
63 .probefunc = probe_jfs,
64 .minsz = 16 * 1024 * 1024,
65 .magics =
66 {
67 { .magic = "JFS1", .len = 4, .kboff = 32 },
68 { NULL }
69 }
70};
71