2 * volume_id - reads filesystem label and uuid
4 * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation version 2 of the License.
26 #include "volume_id.h"
29 #include "linux_swap.h"
31 struct swap_header_v1_2 {
32 uint8_t bootbits[1024];
37 uint8_t volume_name[16];
38 } __attribute__((__packed__)) *sw;
40 #define LARGEST_PAGESIZE 0x4000
42 int volume_id_probe_linux_swap(struct volume_id *id, uint64_t off)
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 strcpy(id->type_version, "1");
60 if (memcmp(buf, "SWAPSPACE2", 10) == 0) {
61 sw = (struct swap_header_v1_2 *) volume_id_get_buffer(id, off, sizeof(struct swap_header_v1_2));
64 strcpy(id->type_version, "2");
65 volume_id_set_label_raw(id, sw->volume_name, 16);
66 volume_id_set_label_string(id, sw->volume_name, 16);
67 volume_id_set_uuid(id, sw->uuid, UUID_DCE);
74 volume_id_set_usage(id, VOLUME_ID_OTHER);