blob: 7ac119bedaf18e7bc7112726a4b5975ac20083e6 [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
21/* linux-2.6/include/linux/swap.h */
22struct swap_header_v1_2 {
23 /* char bootbits[1024]; */ /* Space for disklabel etc. */
24 uint32_t version;
25 uint32_t lastpage;
26 uint32_t nr_badpages;
27 unsigned char uuid[16];
28 unsigned char volume[16];
29 uint32_t padding[117];
30 uint32_t badpages[1];
31} __attribute__((packed));
32
33#define PAGESIZE_MIN 0xff6 /* 4086 (arm, i386, ...) */
34#define PAGESIZE_MAX 0xfff6 /* 65526 (ia64) */
35
36#define TOI_MAGIC_STRING "\xed\xc3\x02\xe9\x98\x56\xe5\x0c"
37#define TOI_MAGIC_STRLEN (sizeof(TOI_MAGIC_STRING) - 1)
38
39static int swap_set_info(blkid_probe pr, const char *version)
40{
41 struct swap_header_v1_2 *hdr;
42
43 /* Swap header always located at offset of 1024 bytes */
44 hdr = (struct swap_header_v1_2 *) blkid_probe_get_buffer(pr, 1024,
45 sizeof(struct swap_header_v1_2));
46 if (!hdr)
47 return -1;
48
49 /* SWAPSPACE2 - check for wrong version or zeroed pagecount */
50 if (strcmp(version, "2") == 0 &&
51 (hdr->version != 1 || hdr->lastpage == 0))
52 return -1;
53
54 /* arbitrary sanity check.. is there any garbage down there? */
55 if (hdr->padding[32] == 0 && hdr->padding[33] == 0) {
56 if (hdr->volume[0] && blkid_probe_set_label(pr, hdr->volume,
57 sizeof(hdr->volume)) < 0)
58 return -1;
59 if (blkid_probe_set_uuid(pr, hdr->uuid) < 0)
60 return -1;
61 }
62
63 blkid_probe_set_version(pr, version);
64 return 0;
65}
66
67static int probe_swap(blkid_probe pr, const struct blkid_idmag *mag)
68{
69 unsigned char *buf;
70
71 if (!mag)
72 return -1;
73
74 /* TuxOnIce keeps valid swap header at the end of the 1st page */
75 buf = blkid_probe_get_buffer(pr, 0, TOI_MAGIC_STRLEN);
76 if (!buf)
77 return -1;
78
79 if (memcmp(buf, TOI_MAGIC_STRING, TOI_MAGIC_STRLEN) == 0)
80 return 1; /* Ignore swap signature, it's TuxOnIce */
81
82 if (!memcmp(mag->magic, "SWAP-SPACE", mag->len)) {
83 /* swap v0 doesn't support LABEL or UUID */
84 blkid_probe_set_version(pr, "1");
85 return 0;
86
87 } else if (!memcmp(mag->magic, "SWAPSPACE2", mag->len))
88 return swap_set_info(pr, "2");
89
90 return -1;
91}
92
93static int probe_swsuspend(blkid_probe pr, const struct blkid_idmag *mag)
94{
95 if (!mag)
96 return -1;
97 if (!memcmp(mag->magic, "S1SUSPEND", mag->len))
98 return swap_set_info(pr, "s1suspend");
99 if (!memcmp(mag->magic, "S2SUSPEND", mag->len))
100 return swap_set_info(pr, "s2suspend");
101 if (!memcmp(mag->magic, "ULSUSPEND", mag->len))
102 return swap_set_info(pr, "ulsuspend");
103 if (!memcmp(mag->magic, TOI_MAGIC_STRING, mag->len))
104 return swap_set_info(pr, "tuxonice");
105 if (!memcmp(mag->magic, "LINHIB0001", mag->len))
106 return swap_set_info(pr, "linhib0001");
107
108 return -1; /* no signature detected */
109}
110
111const struct blkid_idinfo swap_idinfo =
112{
113 .name = "swap",
114 .usage = BLKID_USAGE_OTHER,
115 .probefunc = probe_swap,
116 .minsz = 10 * 4096, /* 10 pages */
117 .magics =
118 {
119 { "SWAP-SPACE", 10, 0, 0xff6 },
120 { "SWAPSPACE2", 10, 0, 0xff6 },
121 { "SWAP-SPACE", 10, 0, 0x1ff6 },
122 { "SWAPSPACE2", 10, 0, 0x1ff6 },
123 { "SWAP-SPACE", 10, 0, 0x3ff6 },
124 { "SWAPSPACE2", 10, 0, 0x3ff6 },
125 { "SWAP-SPACE", 10, 0, 0x7ff6 },
126 { "SWAPSPACE2", 10, 0, 0x7ff6 },
127 { "SWAP-SPACE", 10, 0, 0xfff6 },
128 { "SWAPSPACE2", 10, 0, 0xfff6 },
129 { NULL }
130 }
131};
132
133
134const struct blkid_idinfo swsuspend_idinfo =
135{
136 .name = "swsuspend",
137 .usage = BLKID_USAGE_OTHER,
138 .probefunc = probe_swsuspend,
139 .minsz = 10 * 4096, /* 10 pages */
140 .magics =
141 {
142 { TOI_MAGIC_STRING, TOI_MAGIC_STRLEN, 0, 0 },
143 { "S1SUSPEND", 9, 0, 0xff6 },
144 { "S2SUSPEND", 9, 0, 0xff6 },
145 { "ULSUSPEND", 9, 0, 0xff6 },
146 { "LINHIB0001",10,0, 0xff6 },
147
148 { "S1SUSPEND", 9, 0, 0x1ff6 },
149 { "S2SUSPEND", 9, 0, 0x1ff6 },
150 { "ULSUSPEND", 9, 0, 0x1ff6 },
151 { "LINHIB0001",10,0, 0x1ff6 },
152
153 { "S1SUSPEND", 9, 0, 0x3ff6 },
154 { "S2SUSPEND", 9, 0, 0x3ff6 },
155 { "ULSUSPEND", 9, 0, 0x3ff6 },
156 { "LINHIB0001",10,0, 0x3ff6 },
157
158 { "S1SUSPEND", 9, 0, 0x7ff6 },
159 { "S2SUSPEND", 9, 0, 0x7ff6 },
160 { "ULSUSPEND", 9, 0, 0x7ff6 },
161 { "LINHIB0001",10,0, 0x7ff6 },
162
163 { "S1SUSPEND", 9, 0, 0xfff6 },
164 { "S2SUSPEND", 9, 0, 0xfff6 },
165 { "ULSUSPEND", 9, 0, 0xfff6 },
166 { "LINHIB0001",10,0, 0xfff6 },
167
168 { NULL }
169 }
170};
171