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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21 | #include "volume_id_internal.h"
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22 |
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23 | struct swap_header_v1_2 {
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24 | uint8_t bootbits[1024];
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25 | uint32_t version;
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26 | uint32_t last_page;
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27 | uint32_t nr_badpages;
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28 | uint8_t uuid[16];
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29 | uint8_t volume_name[16];
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30 | } PACKED;
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31 |
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32 | #define LARGEST_PAGESIZE 0x4000
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33 |
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34 | int FAST_FUNC volume_id_probe_linux_swap(struct volume_id *id /*,uint64_t off*/)
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35 | {
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36 | #define off ((uint64_t)0)
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37 | struct swap_header_v1_2 *sw;
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38 | const uint8_t *buf;
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39 | unsigned page;
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40 |
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41 | dbg("probing at offset 0x%llx", (unsigned long long) off);
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42 |
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43 | /* the swap signature is at the end of the PAGE_SIZE */
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44 | for (page = 0x1000; page <= LARGEST_PAGESIZE; page <<= 1) {
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45 | buf = volume_id_get_buffer(id, off + page-10, 10);
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46 | if (buf == NULL)
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47 | return -1;
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48 |
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49 | if (memcmp(buf, "SWAP-SPACE", 10) == 0) {
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50 | // id->type_version[0] = '1';
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51 | // id->type_version[1] = '\0';
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52 | goto found;
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53 | }
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54 |
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55 | if (memcmp(buf, "SWAPSPACE2", 10) == 0
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56 | || memcmp(buf, "S1SUSPEND", 9) == 0
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57 | || memcmp(buf, "S2SUSPEND", 9) == 0
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58 | || memcmp(buf, "ULSUSPEND", 9) == 0
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59 | ) {
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60 | sw = volume_id_get_buffer(id, off, sizeof(struct swap_header_v1_2));
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61 | if (sw == NULL)
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62 | return -1;
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63 | // id->type_version[0] = '2';
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64 | // id->type_version[1] = '\0';
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65 | // volume_id_set_label_raw(id, sw->volume_name, 16);
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66 | volume_id_set_label_string(id, sw->volume_name, 16);
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67 | volume_id_set_uuid(id, sw->uuid, UUID_DCE);
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68 | goto found;
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69 | }
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70 | }
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71 | return -1;
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72 |
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73 | found:
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74 | // volume_id_set_usage(id, VOLUME_ID_OTHER);
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75 | IF_FEATURE_BLKID_TYPE(id->type = "swap";)
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76 |
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77 | return 0;
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78 | }
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