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
35 #include <asm/types.h>
37 #include "volume_id.h"
40 #include "linux_swap.h"
42 struct swap_header_v1_2 {
49 } __attribute__((__packed__)) *sw;
51 #define LARGEST_PAGESIZE 0x4000
53 int volume_id_probe_linux_swap(struct volume_id *id, __u64 off)
58 dbg("probing at offset %llu", off);
60 /* the swap signature is at the end of the PAGE_SIZE */
61 for (page = 0x1000; page <= LARGEST_PAGESIZE; page <<= 1) {
62 buf = volume_id_get_buffer(id, off + page-10, 10);
66 if (memcmp(buf, "SWAP-SPACE", 10) == 0) {
67 strcpy(id->type_version, "1");
71 if (memcmp(buf, "SWAPSPACE2", 10) == 0) {
72 sw = (struct swap_header_v1_2 *) volume_id_get_buffer(id, off, sizeof(struct swap_header_v1_2));
75 strcpy(id->type_version, "2");
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);
85 volume_id_set_usage(id, VOLUME_ID_OTHER);