2 * volume_id - reads filesystem label and uuid
4 * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
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.
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.
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
20 //config:config FEATURE_VOLUMEID_LINUXSWAP
21 //config: bool "linux swap filesystem"
23 //config: depends on VOLUMEID
25 //kbuild:lib-$(CONFIG_FEATURE_VOLUMEID_LINUXSWAP) += linux_swap.o
27 #include "volume_id_internal.h"
29 struct swap_header_v1_2 {
30 uint8_t bootbits[1024];
35 uint8_t volume_name[16];
38 #define LARGEST_PAGESIZE 0x4000
40 int FAST_FUNC volume_id_probe_linux_swap(struct volume_id *id /*,uint64_t off*/)
42 #define off ((uint64_t)0)
43 struct swap_header_v1_2 *sw;
47 dbg("probing at offset 0x%llx", (unsigned long long) off);
49 /* the swap signature is at the end of the PAGE_SIZE */
50 for (page = 0x1000; page <= LARGEST_PAGESIZE; page <<= 1) {
51 buf = volume_id_get_buffer(id, off + page-10, 10);
55 if (memcmp(buf, "SWAP-SPACE", 10) == 0) {
56 // id->type_version[0] = '1';
57 // id->type_version[1] = '\0';
61 if (memcmp(buf, "SWAPSPACE2", 10) == 0
62 || memcmp(buf, "S1SUSPEND", 9) == 0
63 || memcmp(buf, "S2SUSPEND", 9) == 0
64 || memcmp(buf, "ULSUSPEND", 9) == 0
66 sw = volume_id_get_buffer(id, off, sizeof(struct swap_header_v1_2));
69 // id->type_version[0] = '2';
70 // id->type_version[1] = '\0';
71 // volume_id_set_label_raw(id, sw->volume_name, 16);
72 volume_id_set_label_string(id, sw->volume_name, 16);
73 volume_id_set_uuid(id, sw->uuid, UUID_DCE);
80 // volume_id_set_usage(id, VOLUME_ID_OTHER);
81 IF_FEATURE_BLKID_TYPE(id->type = "swap";)