74 lines
2.1 KiB
C
74 lines
2.1 KiB
C
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/*
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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 library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "volume_id_internal.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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} __attribute__((__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)
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{
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struct swap_header_v1_2 *sw;
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const uint8_t *buf;
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unsigned page;
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dbg("probing at offset 0x%llx", (unsigned long long) off);
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/* 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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id->type_version[0] = '1';
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id->type_version[1] = '\0';
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goto found;
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}
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if (memcmp(buf, "SWAPSPACE2", 10) == 0) {
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sw = volume_id_get_buffer(id, off, sizeof(struct swap_header_v1_2));
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if (sw == NULL)
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return -1;
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id->type_version[0] = '2';
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id->type_version[1] = '\0';
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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, UUID_DCE);
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goto found;
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}
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}
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return -1;
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found:
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volume_id_set_usage(id, VOLUME_ID_OTHER);
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id->type = "swap";
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return 0;
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}
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