1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
|
/*
* volume_id - reads filesystem label and uuid
*
* Copyright (C) 2006 Red Hat, Inc. <redhat.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef _GNU_SOURCE
#define _GNU_SOURCE 1
#endif
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <ctype.h>
#include "libvolume_id.h"
#include "libvolume_id-private.h"
/* Common gfs/gfs2 constants: */
#define GFS_MAGIC 0x01161970
#define GFS_DEFAULT_BSIZE 4096
#define GFS_SUPERBLOCK_OFFSET (0x10 * GFS_DEFAULT_BSIZE)
#define GFS_METATYPE_SB 1
#define GFS_FORMAT_SB 100
#define GFS_LOCKNAME_LEN 64
/* gfs1 constants: */
#define GFS_FORMAT_FS 1309
#define GFS_FORMAT_MULTI 1401
/* gfs2 constants: */
#define GFS2_FORMAT_FS 1801
#define GFS2_FORMAT_MULTI 1900
struct gfs2_meta_header {
uint32_t mh_magic;
uint32_t mh_type;
uint64_t __pad0; /* Was generation number in gfs1 */
uint32_t mh_format;
uint32_t __pad1; /* Was incarnation number in gfs1 */
};
struct gfs2_inum {
uint64_t no_formal_ino;
uint64_t no_addr;
};
struct gfs2_sb {
struct gfs2_meta_header sb_header;
uint32_t sb_fs_format;
uint32_t sb_multihost_format;
uint32_t __pad0; /* Was superblock flags in gfs1 */
uint32_t sb_bsize;
uint32_t sb_bsize_shift;
uint32_t __pad1; /* Was journal segment size in gfs1 */
struct gfs2_inum sb_master_dir; /* Was jindex dinode in gfs1 */
struct gfs2_inum __pad2; /* Was rindex dinode in gfs1 */
struct gfs2_inum sb_root_dir;
char sb_lockproto[GFS_LOCKNAME_LEN];
char sb_locktable[GFS_LOCKNAME_LEN];
/* In gfs1, quota and license dinodes followed */
} PACKED;
static int volume_id_probe_gfs_generic(struct volume_id *id, uint64_t off, int vers)
{
struct gfs2_sb *sbd;
info("probing at offset 0x%" PRIx64 "\n", off);
sbd = (struct gfs2_sb *)
volume_id_get_buffer(id, off + GFS_SUPERBLOCK_OFFSET, sizeof(struct gfs2_sb));
if (sbd == NULL)
return -1;
if (be32_to_cpu(sbd->sb_header.mh_magic) == GFS_MAGIC &&
be32_to_cpu(sbd->sb_header.mh_type) == GFS_METATYPE_SB) {
if (vers == 1) {
if (be32_to_cpu(sbd->sb_fs_format) != GFS_FORMAT_FS ||
be32_to_cpu(sbd->sb_multihost_format) != GFS_FORMAT_MULTI)
return -1; /* not gfs1 */
id->type = "gfs";
}
else if (vers == 2) {
if (be32_to_cpu(sbd->sb_fs_format) != GFS2_FORMAT_FS ||
be32_to_cpu(sbd->sb_multihost_format) != GFS2_FORMAT_MULTI)
return -1; /* not gfs2 */
id->type = "gfs2";
}
else
return -1;
if (strlen(sbd->sb_locktable)) {
uint8_t *label = (uint8_t *) sbd->sb_locktable;
volume_id_set_label_raw(id, label, GFS_LOCKNAME_LEN);
volume_id_set_label_string(id, label, GFS_LOCKNAME_LEN);
}
strcpy(id->type_version, "1");
volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
return 0;
}
return -1;
}
int volume_id_probe_gfs(struct volume_id *id, uint64_t off, uint64_t size)
{
return volume_id_probe_gfs_generic(id, off, 1);
}
int volume_id_probe_gfs2(struct volume_id *id, uint64_t off, uint64_t size)
{
return volume_id_probe_gfs_generic(id, off, 2);
}
|
