xfs_buf_item.h 4.2 KB

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  1. /*
  2. * Copyright (c) 2000-2001,2005 Silicon Graphics, Inc.
  3. * All Rights Reserved.
  4. *
  5. * This program is free software; you can redistribute it and/or
  6. * modify it under the terms of the GNU General Public License as
  7. * published by the Free Software Foundation.
  8. *
  9. * This program is distributed in the hope that it would be useful,
  10. * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  12. * GNU General Public License for more details.
  13. *
  14. * You should have received a copy of the GNU General Public License
  15. * along with this program; if not, write the Free Software Foundation,
  16. * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  17. */
  18. #ifndef __XFS_BUF_ITEM_H__
  19. #define __XFS_BUF_ITEM_H__
  20. /*
  21. * This is the structure used to lay out a buf log item in the
  22. * log. The data map describes which 128 byte chunks of the buffer
  23. * have been logged.
  24. * For 6.2 and beyond, this is XFS_LI_BUF. We use this to log everything.
  25. */
  26. typedef struct xfs_buf_log_format_t {
  27. unsigned short blf_type; /* buf log item type indicator */
  28. unsigned short blf_size; /* size of this item */
  29. ushort blf_flags; /* misc state */
  30. ushort blf_len; /* number of blocks in this buf */
  31. __int64_t blf_blkno; /* starting blkno of this buf */
  32. unsigned int blf_map_size; /* size of data bitmap in words */
  33. unsigned int blf_data_map[1];/* variable size bitmap of */
  34. /* regions of buffer in this item */
  35. } xfs_buf_log_format_t;
  36. /*
  37. * This flag indicates that the buffer contains on disk inodes
  38. * and requires special recovery handling.
  39. */
  40. #define XFS_BLI_INODE_BUF 0x1
  41. /*
  42. * This flag indicates that the buffer should not be replayed
  43. * during recovery because its blocks are being freed.
  44. */
  45. #define XFS_BLI_CANCEL 0x2
  46. /*
  47. * This flag indicates that the buffer contains on disk
  48. * user or group dquots and may require special recovery handling.
  49. */
  50. #define XFS_BLI_UDQUOT_BUF 0x4
  51. #define XFS_BLI_PDQUOT_BUF 0x8
  52. #define XFS_BLI_GDQUOT_BUF 0x10
  53. #define XFS_BLI_CHUNK 128
  54. #define XFS_BLI_SHIFT 7
  55. #define BIT_TO_WORD_SHIFT 5
  56. #define NBWORD (NBBY * sizeof(unsigned int))
  57. /*
  58. * buf log item flags
  59. */
  60. #define XFS_BLI_HOLD 0x01
  61. #define XFS_BLI_DIRTY 0x02
  62. #define XFS_BLI_STALE 0x04
  63. #define XFS_BLI_LOGGED 0x08
  64. #define XFS_BLI_INODE_ALLOC_BUF 0x10
  65. #define XFS_BLI_STALE_INODE 0x20
  66. #ifdef __KERNEL__
  67. struct xfs_buf;
  68. struct ktrace;
  69. struct xfs_mount;
  70. struct xfs_buf_log_item;
  71. #if defined(XFS_BLI_TRACE)
  72. #define XFS_BLI_TRACE_SIZE 32
  73. void xfs_buf_item_trace(char *, struct xfs_buf_log_item *);
  74. #else
  75. #define xfs_buf_item_trace(id, bip)
  76. #endif
  77. /*
  78. * This is the in core log item structure used to track information
  79. * needed to log buffers. It tracks how many times the lock has been
  80. * locked, and which 128 byte chunks of the buffer are dirty.
  81. */
  82. typedef struct xfs_buf_log_item {
  83. xfs_log_item_t bli_item; /* common item structure */
  84. struct xfs_buf *bli_buf; /* real buffer pointer */
  85. unsigned int bli_flags; /* misc flags */
  86. unsigned int bli_recur; /* lock recursion count */
  87. atomic_t bli_refcount; /* cnt of tp refs */
  88. #ifdef XFS_BLI_TRACE
  89. struct ktrace *bli_trace; /* event trace buf */
  90. #endif
  91. #ifdef XFS_TRANS_DEBUG
  92. char *bli_orig; /* original buffer copy */
  93. char *bli_logged; /* bytes logged (bitmap) */
  94. #endif
  95. xfs_buf_log_format_t bli_format; /* in-log header */
  96. } xfs_buf_log_item_t;
  97. /*
  98. * This structure is used during recovery to record the buf log
  99. * items which have been canceled and should not be replayed.
  100. */
  101. typedef struct xfs_buf_cancel {
  102. xfs_daddr_t bc_blkno;
  103. uint bc_len;
  104. int bc_refcount;
  105. struct xfs_buf_cancel *bc_next;
  106. } xfs_buf_cancel_t;
  107. void xfs_buf_item_init(struct xfs_buf *, struct xfs_mount *);
  108. void xfs_buf_item_relse(struct xfs_buf *);
  109. void xfs_buf_item_log(xfs_buf_log_item_t *, uint, uint);
  110. uint xfs_buf_item_dirty(xfs_buf_log_item_t *);
  111. void xfs_buf_attach_iodone(struct xfs_buf *,
  112. void(*)(struct xfs_buf *, xfs_log_item_t *),
  113. xfs_log_item_t *);
  114. void xfs_buf_iodone_callbacks(struct xfs_buf *);
  115. void xfs_buf_iodone(struct xfs_buf *, xfs_buf_log_item_t *);
  116. #ifdef XFS_TRANS_DEBUG
  117. void
  118. xfs_buf_item_flush_log_debug(
  119. struct xfs_buf *bp,
  120. uint first,
  121. uint last);
  122. #else
  123. #define xfs_buf_item_flush_log_debug(bp, first, last)
  124. #endif
  125. #endif /* __KERNEL__ */
  126. #endif /* __XFS_BUF_ITEM_H__ */