summary.h 4.1 KB

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  1. /*
  2. * JFFS2 -- Journalling Flash File System, Version 2.
  3. *
  4. * Copyright © 2004 Ferenc Havasi <havasi@inf.u-szeged.hu>,
  5. * Zoltan Sogor <weth@inf.u-szeged.hu>,
  6. * Patrik Kluba <pajko@halom.u-szeged.hu>,
  7. * University of Szeged, Hungary
  8. *
  9. * For licensing information, see the file 'LICENCE' in this directory.
  10. *
  11. */
  12. #ifndef JFFS2_SUMMARY_H
  13. #define JFFS2_SUMMARY_H
  14. #define BLK_STATE_ALLFF 0
  15. #define BLK_STATE_CLEAN 1
  16. #define BLK_STATE_PARTDIRTY 2
  17. #define BLK_STATE_CLEANMARKER 3
  18. #define BLK_STATE_ALLDIRTY 4
  19. #define BLK_STATE_BADBLOCK 5
  20. #define JFFS2_SUMMARY_NOSUM_SIZE 0xffffffff
  21. #define JFFS2_SUMMARY_INODE_SIZE (sizeof(struct jffs2_sum_inode_flash))
  22. #define JFFS2_SUMMARY_DIRENT_SIZE(x) (sizeof(struct jffs2_sum_dirent_flash) + (x))
  23. #define JFFS2_SUMMARY_XATTR_SIZE (sizeof(struct jffs2_sum_xattr_flash))
  24. #define JFFS2_SUMMARY_XREF_SIZE (sizeof(struct jffs2_sum_xref_flash))
  25. /* Summary structures used on flash */
  26. struct jffs2_sum_unknown_flash
  27. {
  28. __u16 nodetype; /* node type */
  29. };
  30. struct jffs2_sum_inode_flash
  31. {
  32. __u16 nodetype; /* node type */
  33. __u32 inode; /* inode number */
  34. __u32 version; /* inode version */
  35. __u32 offset; /* offset on jeb */
  36. __u32 totlen; /* record length */
  37. } __attribute__((packed));
  38. struct jffs2_sum_dirent_flash
  39. {
  40. __u16 nodetype; /* == JFFS_NODETYPE_DIRENT */
  41. __u32 totlen; /* record length */
  42. __u32 offset; /* offset on jeb */
  43. __u32 pino; /* parent inode */
  44. __u32 version; /* dirent version */
  45. __u32 ino; /* == zero for unlink */
  46. uint8_t nsize; /* dirent name size */
  47. uint8_t type; /* dirent type */
  48. uint8_t name[0]; /* dirent name */
  49. } __attribute__((packed));
  50. struct jffs2_sum_xattr_flash
  51. {
  52. __u16 nodetype; /* == JFFS2_NODETYPE_XATR */
  53. __u32 xid; /* xattr identifier */
  54. __u32 version; /* version number */
  55. __u32 offset; /* offset on jeb */
  56. __u32 totlen; /* node length */
  57. } __attribute__((packed));
  58. struct jffs2_sum_xref_flash
  59. {
  60. __u16 nodetype; /* == JFFS2_NODETYPE_XREF */
  61. __u32 offset; /* offset on jeb */
  62. } __attribute__((packed));
  63. union jffs2_sum_flash
  64. {
  65. struct jffs2_sum_unknown_flash u;
  66. struct jffs2_sum_inode_flash i;
  67. struct jffs2_sum_dirent_flash d;
  68. struct jffs2_sum_xattr_flash x;
  69. struct jffs2_sum_xref_flash r;
  70. };
  71. /* Summary structures used in the memory */
  72. struct jffs2_sum_unknown_mem
  73. {
  74. union jffs2_sum_mem *next;
  75. __u16 nodetype; /* node type */
  76. };
  77. struct jffs2_sum_inode_mem
  78. {
  79. union jffs2_sum_mem *next;
  80. __u16 nodetype; /* node type */
  81. __u32 inode; /* inode number */
  82. __u32 version; /* inode version */
  83. __u32 offset; /* offset on jeb */
  84. __u32 totlen; /* record length */
  85. } __attribute__((packed));
  86. struct jffs2_sum_dirent_mem
  87. {
  88. union jffs2_sum_mem *next;
  89. __u16 nodetype; /* == JFFS_NODETYPE_DIRENT */
  90. __u32 totlen; /* record length */
  91. __u32 offset; /* ofset on jeb */
  92. __u32 pino; /* parent inode */
  93. __u32 version; /* dirent version */
  94. __u32 ino; /* == zero for unlink */
  95. uint8_t nsize; /* dirent name size */
  96. uint8_t type; /* dirent type */
  97. uint8_t name[0]; /* dirent name */
  98. } __attribute__((packed));
  99. struct jffs2_sum_xattr_mem
  100. {
  101. union jffs2_sum_mem *next;
  102. __u16 nodetype;
  103. __u32 xid;
  104. __u32 version;
  105. __u32 offset;
  106. __u32 totlen;
  107. } __attribute__((packed));
  108. struct jffs2_sum_xref_mem
  109. {
  110. union jffs2_sum_mem *next;
  111. __u16 nodetype;
  112. __u32 offset;
  113. } __attribute__((packed));
  114. union jffs2_sum_mem
  115. {
  116. struct jffs2_sum_unknown_mem u;
  117. struct jffs2_sum_inode_mem i;
  118. struct jffs2_sum_dirent_mem d;
  119. struct jffs2_sum_xattr_mem x;
  120. struct jffs2_sum_xref_mem r;
  121. };
  122. /* Summary related information stored in superblock */
  123. struct jffs2_summary
  124. {
  125. uint32_t sum_size; /* collected summary information for nextblock */
  126. uint32_t sum_num;
  127. uint32_t sum_padded;
  128. union jffs2_sum_mem *sum_list_head;
  129. union jffs2_sum_mem *sum_list_tail;
  130. __u32 *sum_buf; /* buffer for writing out summary */
  131. };
  132. /* Summary marker is stored at the end of every sumarized erase block */
  133. struct jffs2_sum_marker
  134. {
  135. __u32 offset; /* offset of the summary node in the jeb */
  136. __u32 magic; /* == JFFS2_SUM_MAGIC */
  137. };
  138. #define JFFS2_SUMMARY_FRAME_SIZE (sizeof(struct jffs2_raw_summary) + sizeof(struct jffs2_sum_marker))
  139. #endif /* JFFS2_SUMMARY_H */