3
0

linux_raid.c 2.5 KB

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687
  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. //config:config FEATURE_VOLUMEID_LINUXRAID
  21. //config: bool "linuxraid"
  22. //config: default y
  23. //config: depends on VOLUMEID
  24. //kbuild:lib-$(CONFIG_FEATURE_VOLUMEID_LINUXRAID) += linux_raid.o
  25. #include "volume_id_internal.h"
  26. struct mdp_super_block {
  27. uint32_t md_magic;
  28. uint32_t major_version;
  29. uint32_t minor_version;
  30. uint32_t patch_version;
  31. uint32_t gvalid_words;
  32. uint32_t set_uuid0;
  33. uint32_t ctime;
  34. uint32_t level;
  35. uint32_t size;
  36. uint32_t nr_disks;
  37. uint32_t raid_disks;
  38. uint32_t md_minor;
  39. uint32_t not_persistent;
  40. uint32_t set_uuid1;
  41. uint32_t set_uuid2;
  42. uint32_t set_uuid3;
  43. } PACKED;
  44. #define MD_RESERVED_BYTES 0x10000
  45. #define MD_MAGIC 0xa92b4efc
  46. int FAST_FUNC volume_id_probe_linux_raid(struct volume_id *id /*,uint64_t off*/, uint64_t size)
  47. {
  48. typedef uint32_t aliased_uint32_t FIX_ALIASING;
  49. #define off ((uint64_t)0)
  50. uint64_t sboff;
  51. uint8_t uuid[16];
  52. struct mdp_super_block *mdp;
  53. dbg("probing at offset 0x%llx, size 0x%llx",
  54. (unsigned long long) off, (unsigned long long) size);
  55. if (size < 0x10000)
  56. return -1;
  57. sboff = (size & ~(MD_RESERVED_BYTES - 1)) - MD_RESERVED_BYTES;
  58. mdp = volume_id_get_buffer(id, off + sboff, 0x800);
  59. if (mdp == NULL)
  60. return -1;
  61. if (mdp->md_magic != cpu_to_le32(MD_MAGIC))
  62. return -1;
  63. *(aliased_uint32_t*)uuid = mdp->set_uuid0;
  64. memcpy(&uuid[4], &mdp->set_uuid1, 12);
  65. volume_id_set_uuid(id, uuid, UUID_DCE);
  66. // snprintf(id->type_version, sizeof(id->type_version)-1, "%u.%u.%u",
  67. // le32_to_cpu(mdp->major_version),
  68. // le32_to_cpu(mdp->minor_version),
  69. // le32_to_cpu(mdp->patch_version));
  70. dbg("found raid signature");
  71. // volume_id_set_usage(id, VOLUME_ID_RAID);
  72. IF_FEATURE_BLKID_TYPE(id->type = "linux_raid_member";)
  73. return 0;
  74. }