1 /*
2 * volume_id - reads filesystem label and uuid
3 *
4 * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 */
20
21 //kbuild:lib-$(CONFIG_FEATURE_VOLUMEID_LINUXSWAP) += linux_swap.o
22
23 //config:
24 //config:config FEATURE_VOLUMEID_LINUXSWAP
25 //config: bool "linux swap filesystem"
26 //config: default y
27 //config: depends on VOLUMEID
28 //config: help
29 //config: TODO
30 //config:
31
32 #include "volume_id_internal.h"
33
34 struct swap_header_v1_2 {
35 uint8_t bootbits[1024];
36 uint32_t version;
37 uint32_t last_page;
38 uint32_t nr_badpages;
39 uint8_t uuid[16];
40 uint8_t volume_name[16];
41 } PACKED;
42
43 #define LARGEST_PAGESIZE 0x4000
44
volume_id_probe_linux_swap(struct volume_id * id)45 int FAST_FUNC volume_id_probe_linux_swap(struct volume_id *id /*,uint64_t off*/)
46 {
47 #define off ((uint64_t)0)
48 struct swap_header_v1_2 *sw;
49 const uint8_t *buf;
50 unsigned page;
51
52 dbg("probing at offset 0x%llx", (unsigned long long) off);
53
54 /* the swap signature is at the end of the PAGE_SIZE */
55 for (page = 0x1000; page <= LARGEST_PAGESIZE; page <<= 1) {
56 buf = volume_id_get_buffer(id, off + page-10, 10);
57 if (buf == NULL)
58 return -1;
59
60 if (memcmp(buf, "SWAP-SPACE", 10) == 0) {
61 // id->type_version[0] = '1';
62 // id->type_version[1] = '\0';
63 goto found;
64 }
65
66 if (memcmp(buf, "SWAPSPACE2", 10) == 0
67 || memcmp(buf, "S1SUSPEND", 9) == 0
68 || memcmp(buf, "S2SUSPEND", 9) == 0
69 || memcmp(buf, "ULSUSPEND", 9) == 0
70 ) {
71 sw = volume_id_get_buffer(id, off, sizeof(struct swap_header_v1_2));
72 if (sw == NULL)
73 return -1;
74 // id->type_version[0] = '2';
75 // id->type_version[1] = '\0';
76 // volume_id_set_label_raw(id, sw->volume_name, 16);
77 volume_id_set_label_string(id, sw->volume_name, 16);
78 volume_id_set_uuid(id, sw->uuid, UUID_DCE);
79 goto found;
80 }
81 }
82 return -1;
83
84 found:
85 // volume_id_set_usage(id, VOLUME_ID_OTHER);
86 IF_FEATURE_BLKID_TYPE(id->type = "swap";)
87
88 return 0;
89 }
90