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
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
|
/*
* Copyright (C) 1999 by Andries Brouwer
* Copyright (C) 1999, 2000, 2003 by Theodore Ts'o
* Copyright (C) 2001 by Andreas Dilger
* Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
* Copyright (C) 2008 Karel Zak <kzak@redhat.com>
*
* This file may be redistributed under the terms of the
* GNU Lesser General Public License.
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <ctype.h>
#include <stdint.h>
#include "superblocks.h"
/* linux-2.6/include/linux/swap.h */
struct swap_header_v1_2 {
/* char bootbits[1024]; */ /* Space for disklabel etc. */
uint32_t version;
uint32_t lastpage;
uint32_t nr_badpages;
unsigned char uuid[16];
unsigned char volume[16];
uint32_t padding[117];
uint32_t badpages[1];
} __attribute__((packed));
#define PAGESIZE_MIN 0xff6 /* 4086 (arm, i386, ...) */
#define PAGESIZE_MAX 0xfff6 /* 65526 (ia64) */
#define TOI_MAGIC_STRING "\xed\xc3\x02\xe9\x98\x56\xe5\x0c"
#define TOI_MAGIC_STRLEN (sizeof(TOI_MAGIC_STRING) - 1)
static int swap_set_info(blkid_probe pr, const char *version)
{
struct swap_header_v1_2 *hdr;
/* Swap header always located at offset of 1024 bytes */
hdr = (struct swap_header_v1_2 *) blkid_probe_get_buffer(pr, 1024,
sizeof(struct swap_header_v1_2));
if (!hdr)
return -1;
/* SWAPSPACE2 - check for wrong version or zeroed pagecount */
if (strcmp(version, "2") == 0 &&
(hdr->version != 1 || hdr->lastpage == 0))
return -1;
/* arbitrary sanity check.. is there any garbage down there? */
if (hdr->padding[32] == 0 && hdr->padding[33] == 0) {
if (hdr->volume[0] && blkid_probe_set_label(pr, hdr->volume,
sizeof(hdr->volume)) < 0)
return -1;
if (blkid_probe_set_uuid(pr, hdr->uuid) < 0)
return -1;
}
blkid_probe_set_version(pr, version);
return 0;
}
static int probe_swap(blkid_probe pr, const struct blkid_idmag *mag)
{
unsigned char *buf;
if (!mag)
return -1;
/* TuxOnIce keeps valid swap header at the end of the 1st page */
buf = blkid_probe_get_buffer(pr, 0, TOI_MAGIC_STRLEN);
if (!buf)
return -1;
if (memcmp(buf, TOI_MAGIC_STRING, TOI_MAGIC_STRLEN) == 0)
return 1; /* Ignore swap signature, it's TuxOnIce */
if (!memcmp(mag->magic, "SWAP-SPACE", mag->len)) {
/* swap v0 doesn't support LABEL or UUID */
blkid_probe_set_version(pr, "1");
return 0;
} else if (!memcmp(mag->magic, "SWAPSPACE2", mag->len))
return swap_set_info(pr, "2");
return -1;
}
static int probe_swsuspend(blkid_probe pr, const struct blkid_idmag *mag)
{
if (!mag)
return -1;
if (!memcmp(mag->magic, "S1SUSPEND", mag->len))
return swap_set_info(pr, "s1suspend");
if (!memcmp(mag->magic, "S2SUSPEND", mag->len))
return swap_set_info(pr, "s2suspend");
if (!memcmp(mag->magic, "ULSUSPEND", mag->len))
return swap_set_info(pr, "ulsuspend");
if (!memcmp(mag->magic, TOI_MAGIC_STRING, mag->len))
return swap_set_info(pr, "tuxonice");
if (!memcmp(mag->magic, "LINHIB0001", mag->len))
return swap_set_info(pr, "linhib0001");
return -1; /* no signature detected */
}
const struct blkid_idinfo swap_idinfo =
{
.name = "swap",
.usage = BLKID_USAGE_OTHER,
.probefunc = probe_swap,
.minsz = 10 * 4096, /* 10 pages */
.magics =
{
{ "SWAP-SPACE", 10, 0, 0xff6 },
{ "SWAPSPACE2", 10, 0, 0xff6 },
{ "SWAP-SPACE", 10, 0, 0x1ff6 },
{ "SWAPSPACE2", 10, 0, 0x1ff6 },
{ "SWAP-SPACE", 10, 0, 0x3ff6 },
{ "SWAPSPACE2", 10, 0, 0x3ff6 },
{ "SWAP-SPACE", 10, 0, 0x7ff6 },
{ "SWAPSPACE2", 10, 0, 0x7ff6 },
{ "SWAP-SPACE", 10, 0, 0xfff6 },
{ "SWAPSPACE2", 10, 0, 0xfff6 },
{ NULL }
}
};
const struct blkid_idinfo swsuspend_idinfo =
{
.name = "swsuspend",
.usage = BLKID_USAGE_OTHER,
.probefunc = probe_swsuspend,
.minsz = 10 * 4096, /* 10 pages */
.magics =
{
{ TOI_MAGIC_STRING, TOI_MAGIC_STRLEN, 0, 0 },
{ "S1SUSPEND", 9, 0, 0xff6 },
{ "S2SUSPEND", 9, 0, 0xff6 },
{ "ULSUSPEND", 9, 0, 0xff6 },
{ "LINHIB0001",10,0, 0xff6 },
{ "S1SUSPEND", 9, 0, 0x1ff6 },
{ "S2SUSPEND", 9, 0, 0x1ff6 },
{ "ULSUSPEND", 9, 0, 0x1ff6 },
{ "LINHIB0001",10,0, 0x1ff6 },
{ "S1SUSPEND", 9, 0, 0x3ff6 },
{ "S2SUSPEND", 9, 0, 0x3ff6 },
{ "ULSUSPEND", 9, 0, 0x3ff6 },
{ "LINHIB0001",10,0, 0x3ff6 },
{ "S1SUSPEND", 9, 0, 0x7ff6 },
{ "S2SUSPEND", 9, 0, 0x7ff6 },
{ "ULSUSPEND", 9, 0, 0x7ff6 },
{ "LINHIB0001",10,0, 0x7ff6 },
{ "S1SUSPEND", 9, 0, 0xfff6 },
{ "S2SUSPEND", 9, 0, 0xfff6 },
{ "ULSUSPEND", 9, 0, 0xfff6 },
{ "LINHIB0001",10,0, 0xfff6 },
{ NULL }
}
};
|
