linux_raid.c 2.3 KB

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  1. /*
  2. * volume_id - reads filesystem label and uuid
  3. *
  4. * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
  5. *
  6. * This library is free software; you can redistribute it and/or
  7. * modify it under the terms of the GNU Lesser General Public
  8. * License as published by the Free Software Foundation; either
  9. * version 2.1 of the License, or (at your option) any later version.
  10. *
  11. * This library is distributed in the hope that it will be useful,
  12. * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14. * Lesser General Public License for more details.
  15. *
  16. * You should have received a copy of the GNU Lesser General Public
  17. * License along with this library; if not, write to the Free Software
  18. * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  19. */
  20. #include "volume_id_internal.h"
  21. struct mdp_super_block {
  22. uint32_t md_magic;
  23. uint32_t major_version;
  24. uint32_t minor_version;
  25. uint32_t patch_version;
  26. uint32_t gvalid_words;
  27. uint32_t set_uuid0;
  28. uint32_t ctime;
  29. uint32_t level;
  30. uint32_t size;
  31. uint32_t nr_disks;
  32. uint32_t raid_disks;
  33. uint32_t md_minor;
  34. uint32_t not_persistent;
  35. uint32_t set_uuid1;
  36. uint32_t set_uuid2;
  37. uint32_t set_uuid3;
  38. } PACKED;
  39. #define MD_RESERVED_BYTES 0x10000
  40. #define MD_MAGIC 0xa92b4efc
  41. int FAST_FUNC volume_id_probe_linux_raid(struct volume_id *id /*,uint64_t off*/, uint64_t size)
  42. {
  43. typedef uint32_t aliased_uint32_t FIX_ALIASING;
  44. #define off ((uint64_t)0)
  45. uint64_t sboff;
  46. uint8_t uuid[16];
  47. struct mdp_super_block *mdp;
  48. dbg("probing at offset 0x%llx, size 0x%llx",
  49. (unsigned long long) off, (unsigned long long) size);
  50. if (size < 0x10000)
  51. return -1;
  52. sboff = (size & ~(MD_RESERVED_BYTES - 1)) - MD_RESERVED_BYTES;
  53. mdp = volume_id_get_buffer(id, off + sboff, 0x800);
  54. if (mdp == NULL)
  55. return -1;
  56. if (mdp->md_magic != cpu_to_le32(MD_MAGIC))
  57. return -1;
  58. *(aliased_uint32_t*)uuid = mdp->set_uuid0;
  59. memcpy(&uuid[4], &mdp->set_uuid1, 12);
  60. volume_id_set_uuid(id, uuid, UUID_DCE);
  61. // snprintf(id->type_version, sizeof(id->type_version)-1, "%u.%u.%u",
  62. // le32_to_cpu(mdp->major_version),
  63. // le32_to_cpu(mdp->minor_version),
  64. // le32_to_cpu(mdp->patch_version));
  65. dbg("found raid signature");
  66. // volume_id_set_usage(id, VOLUME_ID_RAID);
  67. // id->type = "linux_raid_member";
  68. return 0;
  69. }