ext3_fs_i.h 4.4 KB

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147
  1. /*
  2. * linux/include/linux/ext3_fs_i.h
  3. *
  4. * Copyright (C) 1992, 1993, 1994, 1995
  5. * Remy Card (card@masi.ibp.fr)
  6. * Laboratoire MASI - Institut Blaise Pascal
  7. * Universite Pierre et Marie Curie (Paris VI)
  8. *
  9. * from
  10. *
  11. * linux/include/linux/minix_fs_i.h
  12. *
  13. * Copyright (C) 1991, 1992 Linus Torvalds
  14. */
  15. #ifndef _LINUX_EXT3_FS_I
  16. #define _LINUX_EXT3_FS_I
  17. #include <linux/rwsem.h>
  18. #include <linux/rbtree.h>
  19. #include <linux/seqlock.h>
  20. #include <linux/mutex.h>
  21. /* data type for block offset of block group */
  22. typedef int ext3_grpblk_t;
  23. /* data type for filesystem-wide blocks number */
  24. typedef unsigned long ext3_fsblk_t;
  25. #define E3FSBLK "%lu"
  26. struct ext3_reserve_window {
  27. ext3_fsblk_t _rsv_start; /* First byte reserved */
  28. ext3_fsblk_t _rsv_end; /* Last byte reserved or 0 */
  29. };
  30. struct ext3_reserve_window_node {
  31. struct rb_node rsv_node;
  32. __u32 rsv_goal_size;
  33. __u32 rsv_alloc_hit;
  34. struct ext3_reserve_window rsv_window;
  35. };
  36. struct ext3_block_alloc_info {
  37. /* information about reservation window */
  38. struct ext3_reserve_window_node rsv_window_node;
  39. /*
  40. * was i_next_alloc_block in ext3_inode_info
  41. * is the logical (file-relative) number of the
  42. * most-recently-allocated block in this file.
  43. * We use this for detecting linearly ascending allocation requests.
  44. */
  45. __u32 last_alloc_logical_block;
  46. /*
  47. * Was i_next_alloc_goal in ext3_inode_info
  48. * is the *physical* companion to i_next_alloc_block.
  49. * it the the physical block number of the block which was most-recentl
  50. * allocated to this file. This give us the goal (target) for the next
  51. * allocation when we detect linearly ascending requests.
  52. */
  53. ext3_fsblk_t last_alloc_physical_block;
  54. };
  55. #define rsv_start rsv_window._rsv_start
  56. #define rsv_end rsv_window._rsv_end
  57. /*
  58. * third extended file system inode data in memory
  59. */
  60. struct ext3_inode_info {
  61. __le32 i_data[15]; /* unconverted */
  62. __u32 i_flags;
  63. #ifdef EXT3_FRAGMENTS
  64. __u32 i_faddr;
  65. __u8 i_frag_no;
  66. __u8 i_frag_size;
  67. #endif
  68. ext3_fsblk_t i_file_acl;
  69. __u32 i_dir_acl;
  70. __u32 i_dtime;
  71. /*
  72. * i_block_group is the number of the block group which contains
  73. * this file's inode. Constant across the lifetime of the inode,
  74. * it is ued for making block allocation decisions - we try to
  75. * place a file's data blocks near its inode block, and new inodes
  76. * near to their parent directory's inode.
  77. */
  78. __u32 i_block_group;
  79. __u32 i_state; /* Dynamic state flags for ext3 */
  80. /* block reservation info */
  81. struct ext3_block_alloc_info *i_block_alloc_info;
  82. __u32 i_dir_start_lookup;
  83. #ifdef CONFIG_EXT3_FS_XATTR
  84. /*
  85. * Extended attributes can be read independently of the main file
  86. * data. Taking i_mutex even when reading would cause contention
  87. * between readers of EAs and writers of regular file data, so
  88. * instead we synchronize on xattr_sem when reading or changing
  89. * EAs.
  90. */
  91. struct rw_semaphore xattr_sem;
  92. #endif
  93. #ifdef CONFIG_EXT3_FS_POSIX_ACL
  94. struct posix_acl *i_acl;
  95. struct posix_acl *i_default_acl;
  96. #endif
  97. struct list_head i_orphan; /* unlinked but open inodes */
  98. /*
  99. * i_disksize keeps track of what the inode size is ON DISK, not
  100. * in memory. During truncate, i_size is set to the new size by
  101. * the VFS prior to calling ext3_truncate(), but the filesystem won't
  102. * set i_disksize to 0 until the truncate is actually under way.
  103. *
  104. * The intent is that i_disksize always represents the blocks which
  105. * are used by this file. This allows recovery to restart truncate
  106. * on orphans if we crash during truncate. We actually write i_disksize
  107. * into the on-disk inode when writing inodes out, instead of i_size.
  108. *
  109. * The only time when i_disksize and i_size may be different is when
  110. * a truncate is in progress. The only things which change i_disksize
  111. * are ext3_get_block (growth) and ext3_truncate (shrinkth).
  112. */
  113. loff_t i_disksize;
  114. /* on-disk additional length */
  115. __u16 i_extra_isize;
  116. /*
  117. * truncate_mutex is for serialising ext3_truncate() against
  118. * ext3_getblock(). In the 2.4 ext2 design, great chunks of inode's
  119. * data tree are chopped off during truncate. We can't do that in
  120. * ext3 because whenever we perform intermediate commits during
  121. * truncate, the inode and all the metadata blocks *must* be in a
  122. * consistent state which allows truncation of the orphans to restart
  123. * during recovery. Hence we must fix the get_block-vs-truncate race
  124. * by other means, so we have truncate_mutex.
  125. */
  126. struct mutex truncate_mutex;
  127. struct inode vfs_inode;
  128. };
  129. #endif /* _LINUX_EXT3_FS_I */