102 lines
2.6 KiB
C
102 lines
2.6 KiB
C
/*
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* volume_id - reads filesystem label and uuid
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*
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* Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef _GNU_SOURCE
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#define _GNU_SOURCE 1
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <errno.h>
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#include <ctype.h>
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#include "libvolume_id.h"
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#include "libvolume_id-private.h"
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struct swap_header_v1_2 {
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uint8_t bootbits[1024];
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uint32_t version;
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uint32_t last_page;
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uint32_t nr_badpages;
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uint8_t uuid[16];
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uint8_t volume_name[16];
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} PACKED;
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#define LARGEST_PAGESIZE 0x4000
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int volume_id_probe_linux_swap(struct volume_id *id, uint64_t off, uint64_t size)
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{
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const uint8_t *buf;
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unsigned int page;
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struct swap_header_v1_2 *sw;
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info("probing at offset 0x%llx\n", (unsigned long long) off);
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/* eek, the swap signature is at the end of the PAGE_SIZE */
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for (page = 0x1000; page <= LARGEST_PAGESIZE; page <<= 1) {
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buf = volume_id_get_buffer(id, off + page-10, 10);
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if (buf == NULL)
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return -1;
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if (memcmp(buf, "SWAP-SPACE", 10) == 0) {
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strcpy(id->type_version, "1");
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goto found;
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}
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if (memcmp(buf, "SWAPSPACE2", 10) == 0) {
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id->type = "swap";
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strcpy(id->type_version, "2");
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goto found_label;
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}
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if (memcmp(buf, "S1SUSPEND", 9) == 0) {
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id->type = "suspend";
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strcpy(id->type_version, "s1suspend");
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goto found_label;
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}
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if (memcmp(buf, "ULSUSPEND", 9) == 0) {
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id->type = "suspend";
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strcpy(id->type_version, "ulsuspend");
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goto found_label;
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}
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if (memcmp(buf, "\xed\xc3\x02\xe9\x98\x56\xe5\x0c", 8) == 0) {
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id->type = "suspend";
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strcpy(id->type_version, "tuxonice");
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goto found_label;
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}
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}
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return -1;
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found_label:
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sw = (struct swap_header_v1_2 *) volume_id_get_buffer(id, off, sizeof(struct swap_header_v1_2));
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if (sw != NULL) {
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volume_id_set_label_raw(id, sw->volume_name, 16);
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volume_id_set_label_string(id, sw->volume_name, 16);
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volume_id_set_uuid(id, sw->uuid, 0, UUID_DCE);
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}
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found:
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volume_id_set_usage(id, VOLUME_ID_OTHER);
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return 0;
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}
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