[2725] | 1 | /*
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| 2 | * volume_id - reads filesystem label and uuid
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| 3 | *
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| 4 | * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
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| 5 | *
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| 6 | * This library is free software; you can redistribute it and/or
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| 7 | * modify it under the terms of the GNU Lesser General Public
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| 8 | * License as published by the Free Software Foundation; either
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| 9 | * version 2.1 of the License, or (at your option) any later version.
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| 10 | *
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| 11 | * This library is distributed in the hope that it will be useful,
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| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 14 | * Lesser General Public License for more details.
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| 15 | *
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| 16 | * You should have received a copy of the GNU Lesser General Public
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| 17 | * License along with this library; if not, write to the Free Software
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| 18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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| 19 | */
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| 20 |
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[3621] | 21 | //kbuild:lib-$(CONFIG_FEATURE_VOLUMEID_LINUXSWAP) += linux_swap.o
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| 22 |
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| 23 | //config:
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| 24 | //config:config FEATURE_VOLUMEID_LINUXSWAP
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| 25 | //config: bool "linux swap filesystem"
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| 26 | //config: default y
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| 27 | //config: depends on VOLUMEID
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| 28 | //config: help
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| 29 | //config: TODO
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| 30 | //config:
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| 31 |
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[2725] | 32 | #include "volume_id_internal.h"
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| 33 |
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| 34 | struct swap_header_v1_2 {
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| 35 | uint8_t bootbits[1024];
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| 36 | uint32_t version;
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| 37 | uint32_t last_page;
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| 38 | uint32_t nr_badpages;
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| 39 | uint8_t uuid[16];
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| 40 | uint8_t volume_name[16];
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| 41 | } PACKED;
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| 42 |
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| 43 | #define LARGEST_PAGESIZE 0x4000
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| 44 |
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| 45 | int FAST_FUNC volume_id_probe_linux_swap(struct volume_id *id /*,uint64_t off*/)
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| 46 | {
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| 47 | #define off ((uint64_t)0)
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| 48 | struct swap_header_v1_2 *sw;
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| 49 | const uint8_t *buf;
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| 50 | unsigned page;
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| 51 |
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| 52 | dbg("probing at offset 0x%llx", (unsigned long long) off);
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| 53 |
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| 54 | /* the swap signature is at the end of the PAGE_SIZE */
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| 55 | for (page = 0x1000; page <= LARGEST_PAGESIZE; page <<= 1) {
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| 56 | buf = volume_id_get_buffer(id, off + page-10, 10);
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| 57 | if (buf == NULL)
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| 58 | return -1;
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| 59 |
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| 60 | if (memcmp(buf, "SWAP-SPACE", 10) == 0) {
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| 61 | // id->type_version[0] = '1';
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| 62 | // id->type_version[1] = '\0';
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| 63 | goto found;
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| 64 | }
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| 65 |
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| 66 | if (memcmp(buf, "SWAPSPACE2", 10) == 0
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| 67 | || memcmp(buf, "S1SUSPEND", 9) == 0
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| 68 | || memcmp(buf, "S2SUSPEND", 9) == 0
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| 69 | || memcmp(buf, "ULSUSPEND", 9) == 0
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| 70 | ) {
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| 71 | sw = volume_id_get_buffer(id, off, sizeof(struct swap_header_v1_2));
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| 72 | if (sw == NULL)
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| 73 | return -1;
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| 74 | // id->type_version[0] = '2';
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| 75 | // id->type_version[1] = '\0';
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| 76 | // volume_id_set_label_raw(id, sw->volume_name, 16);
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| 77 | volume_id_set_label_string(id, sw->volume_name, 16);
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| 78 | volume_id_set_uuid(id, sw->uuid, UUID_DCE);
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| 79 | goto found;
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| 80 | }
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| 81 | }
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| 82 | return -1;
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| 83 |
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| 84 | found:
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| 85 | // volume_id_set_usage(id, VOLUME_ID_OTHER);
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[3232] | 86 | IF_FEATURE_BLKID_TYPE(id->type = "swap";)
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[2725] | 87 |
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| 88 | return 0;
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| 89 | }
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