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 | //kbuild:### lib-$(CONFIG_FEATURE_VOLUMEID_LVM) += lvm.o
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22 |
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23 | //config:
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24 | //config:### config FEATURE_VOLUMEID_LVM
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25 | //config:### bool "lvm"
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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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32 | #include "volume_id_internal.h"
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33 |
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34 | struct lvm1_super_block {
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35 | uint8_t id[2];
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36 | } PACKED;
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37 |
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38 | struct lvm2_super_block {
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39 | uint8_t id[8];
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40 | uint64_t sector_xl;
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41 | uint32_t crc_xl;
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42 | uint32_t offset_xl;
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43 | uint8_t type[8];
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44 | } PACKED;
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45 |
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46 | #define LVM1_SB_OFF 0x400
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47 |
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48 | int FAST_FUNC volume_id_probe_lvm1(struct volume_id *id, uint64_t off)
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49 | {
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50 | struct lvm1_super_block *lvm;
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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 | lvm = volume_id_get_buffer(id, off + LVM1_SB_OFF, 0x800);
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55 | if (lvm == NULL)
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56 | return -1;
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57 |
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58 | if (lvm->id[0] != 'H' || lvm->id[1] != 'M')
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59 | return -1;
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60 |
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61 | // volume_id_set_usage(id, VOLUME_ID_RAID);
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62 | // id->type = "LVM1_member";
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63 |
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64 | return 0;
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65 | }
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66 |
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67 | #define LVM2_LABEL_ID "LABELONE"
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68 | #define LVM2LABEL_SCAN_SECTORS 4
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69 |
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70 | int FAST_FUNC volume_id_probe_lvm2(struct volume_id *id, uint64_t off)
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71 | {
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72 | const uint8_t *buf;
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73 | unsigned soff;
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74 | struct lvm2_super_block *lvm;
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75 |
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76 | dbg("probing at offset 0x%llx", (unsigned long long) off);
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77 |
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78 | buf = volume_id_get_buffer(id, off, LVM2LABEL_SCAN_SECTORS * 0x200);
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79 | if (buf == NULL)
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80 | return -1;
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81 |
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82 |
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83 | for (soff = 0; soff < LVM2LABEL_SCAN_SECTORS * 0x200; soff += 0x200) {
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84 | lvm = (struct lvm2_super_block *) &buf[soff];
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85 |
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86 | if (memcmp(lvm->id, LVM2_LABEL_ID, 8) == 0)
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87 | goto found;
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88 | }
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89 |
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90 | return -1;
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91 |
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92 | found:
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93 | // memcpy(id->type_version, lvm->type, 8);
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94 | // volume_id_set_usage(id, VOLUME_ID_RAID);
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95 | // id->type = "LVM2_member";
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96 |
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97 | return 0;
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98 | }
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