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sysv.c 3.4 KB

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  1. /*
  2. * volume_id - reads filesystem label and uuid
  3. *
  4. * Copyright (C) 2005 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_SYSV
  21. //config: bool "sysv filesystem"
  22. //config: default y
  23. //config: depends on VOLUMEID
  24. //kbuild:lib-$(CONFIG_FEATURE_VOLUMEID_SYSV) += sysv.o
  25. #include "volume_id_internal.h"
  26. #define SYSV_NICINOD 100
  27. #define SYSV_NICFREE 50
  28. struct sysv_super {
  29. uint16_t s_isize;
  30. uint16_t s_pad0;
  31. uint32_t s_fsize;
  32. uint16_t s_nfree;
  33. uint16_t s_pad1;
  34. uint32_t s_free[SYSV_NICFREE];
  35. uint16_t s_ninode;
  36. uint16_t s_pad2;
  37. uint16_t s_inode[SYSV_NICINOD];
  38. uint8_t s_flock;
  39. uint8_t s_ilock;
  40. uint8_t s_fmod;
  41. uint8_t s_ronly;
  42. uint32_t s_time;
  43. uint16_t s_dinfo[4];
  44. uint32_t s_tfree;
  45. uint16_t s_tinode;
  46. uint16_t s_pad3;
  47. uint8_t s_fname[6];
  48. uint8_t s_fpack[6];
  49. uint32_t s_fill[12];
  50. uint32_t s_state;
  51. uint32_t s_magic;
  52. uint32_t s_type;
  53. } PACKED;
  54. #define XENIX_NICINOD 100
  55. #define XENIX_NICFREE 100
  56. struct xenix_super {
  57. uint16_t s_isize;
  58. uint32_t s_fsize;
  59. uint16_t s_nfree;
  60. uint32_t s_free[XENIX_NICFREE];
  61. uint16_t s_ninode;
  62. uint16_t s_inode[XENIX_NICINOD];
  63. uint8_t s_flock;
  64. uint8_t s_ilock;
  65. uint8_t s_fmod;
  66. uint8_t s_ronly;
  67. uint32_t s_time;
  68. uint32_t s_tfree;
  69. uint16_t s_tinode;
  70. uint16_t s_dinfo[4];
  71. uint8_t s_fname[6];
  72. uint8_t s_fpack[6];
  73. uint8_t s_clean;
  74. uint8_t s_fill[371];
  75. uint32_t s_magic;
  76. uint32_t s_type;
  77. } PACKED;
  78. #define SYSV_SUPERBLOCK_BLOCK 0x01
  79. #define SYSV_MAGIC 0xfd187e20
  80. #define XENIX_SUPERBLOCK_BLOCK 0x18
  81. #define XENIX_MAGIC 0x2b5544
  82. #define SYSV_MAX_BLOCKSIZE 0x800
  83. int FAST_FUNC volume_id_probe_sysv(struct volume_id *id /*,uint64_t off*/)
  84. {
  85. #define off ((uint64_t)0)
  86. struct sysv_super *vs;
  87. struct xenix_super *xs;
  88. unsigned boff;
  89. dbg("probing at offset 0x%llx", (unsigned long long) off);
  90. for (boff = 0x200; boff <= SYSV_MAX_BLOCKSIZE; boff <<= 1) {
  91. vs = volume_id_get_buffer(id, off + (boff * SYSV_SUPERBLOCK_BLOCK), 0x200);
  92. if (vs == NULL)
  93. return -1;
  94. if (vs->s_magic == cpu_to_le32(SYSV_MAGIC) || vs->s_magic == cpu_to_be32(SYSV_MAGIC)) {
  95. // volume_id_set_label_raw(id, vs->s_fname, 6);
  96. volume_id_set_label_string(id, vs->s_fname, 6);
  97. IF_FEATURE_BLKID_TYPE(id->type = "sysv");
  98. goto found;
  99. }
  100. }
  101. for (boff = 0x200; boff <= SYSV_MAX_BLOCKSIZE; boff <<= 1) {
  102. xs = volume_id_get_buffer(id, off + (boff + XENIX_SUPERBLOCK_BLOCK), 0x200);
  103. if (xs == NULL)
  104. return -1;
  105. if (xs->s_magic == cpu_to_le32(XENIX_MAGIC) || xs->s_magic == cpu_to_be32(XENIX_MAGIC)) {
  106. // volume_id_set_label_raw(id, xs->s_fname, 6);
  107. volume_id_set_label_string(id, xs->s_fname, 6);
  108. IF_FEATURE_BLKID_TYPE(id->type = "xenix";)
  109. goto found;
  110. }
  111. }
  112. return -1;
  113. found:
  114. // volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
  115. return 0;
  116. }