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 mdp_super_block {
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24 | uint32_t md_magic;
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25 | uint32_t major_version;
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26 | uint32_t minor_version;
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27 | uint32_t patch_version;
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28 | uint32_t gvalid_words;
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29 | uint32_t set_uuid0;
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30 | uint32_t ctime;
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31 | uint32_t level;
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32 | uint32_t size;
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33 | uint32_t nr_disks;
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34 | uint32_t raid_disks;
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35 | uint32_t md_minor;
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36 | uint32_t not_persistent;
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37 | uint32_t set_uuid1;
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38 | uint32_t set_uuid2;
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39 | uint32_t set_uuid3;
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40 | } PACKED;
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41 |
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42 | #define MD_RESERVED_BYTES 0x10000
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43 | #define MD_MAGIC 0xa92b4efc
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44 |
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45 | int FAST_FUNC volume_id_probe_linux_raid(struct volume_id *id /*,uint64_t off*/, uint64_t size)
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46 | {
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47 | typedef uint32_t aliased_uint32_t FIX_ALIASING;
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48 | #define off ((uint64_t)0)
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49 | uint64_t sboff;
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50 | uint8_t uuid[16];
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51 | struct mdp_super_block *mdp;
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52 |
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53 | dbg("probing at offset 0x%llx, size 0x%llx",
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54 | (unsigned long long) off, (unsigned long long) size);
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55 |
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56 | if (size < 0x10000)
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57 | return -1;
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58 |
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59 | sboff = (size & ~(MD_RESERVED_BYTES - 1)) - MD_RESERVED_BYTES;
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60 | mdp = volume_id_get_buffer(id, off + sboff, 0x800);
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61 | if (mdp == NULL)
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62 | return -1;
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63 |
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64 | if (mdp->md_magic != cpu_to_le32(MD_MAGIC))
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65 | return -1;
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66 |
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67 | *(aliased_uint32_t*)uuid = mdp->set_uuid0;
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68 | memcpy(&uuid[4], &mdp->set_uuid1, 12);
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69 | volume_id_set_uuid(id, uuid, UUID_DCE);
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70 |
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71 | // snprintf(id->type_version, sizeof(id->type_version)-1, "%u.%u.%u",
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72 | // le32_to_cpu(mdp->major_version),
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73 | // le32_to_cpu(mdp->minor_version),
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74 | // le32_to_cpu(mdp->patch_version));
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75 |
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76 | dbg("found raid signature");
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77 | // volume_id_set_usage(id, VOLUME_ID_RAID);
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78 | // id->type = "linux_raid_member";
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79 |
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80 | return 0;
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81 | }
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