xfs_log.h 5.2 KB

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  1. /*
  2. * Copyright (c) 2000-2003,2005 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_LOG_H__
  19. #define __XFS_LOG_H__
  20. /* get lsn fields */
  21. #define CYCLE_LSN(lsn) ((uint)((lsn)>>32))
  22. #define BLOCK_LSN(lsn) ((uint)(lsn))
  23. /* this is used in a spot where we might otherwise double-endian-flip */
  24. #define CYCLE_LSN_DISK(lsn) (((uint *)&(lsn))[0])
  25. #ifdef __KERNEL__
  26. /*
  27. * By comparing each component, we don't have to worry about extra
  28. * endian issues in treating two 32 bit numbers as one 64 bit number
  29. */
  30. static inline xfs_lsn_t _lsn_cmp(xfs_lsn_t lsn1, xfs_lsn_t lsn2)
  31. {
  32. if (CYCLE_LSN(lsn1) != CYCLE_LSN(lsn2))
  33. return (CYCLE_LSN(lsn1)<CYCLE_LSN(lsn2))? -999 : 999;
  34. if (BLOCK_LSN(lsn1) != BLOCK_LSN(lsn2))
  35. return (BLOCK_LSN(lsn1)<BLOCK_LSN(lsn2))? -999 : 999;
  36. return 0;
  37. }
  38. #define XFS_LSN_CMP(x,y) _lsn_cmp(x,y)
  39. /*
  40. * Macros, structures, prototypes for interface to the log manager.
  41. */
  42. /*
  43. * Flags to xfs_log_done()
  44. */
  45. #define XFS_LOG_REL_PERM_RESERV 0x1
  46. /*
  47. * Flags to xfs_log_reserve()
  48. *
  49. * XFS_LOG_SLEEP: If space is not available, sleep (default)
  50. * XFS_LOG_NOSLEEP: If space is not available, return error
  51. * XFS_LOG_PERM_RESERV: Permanent reservation. When writes are
  52. * performed against this type of reservation, the reservation
  53. * is not decreased. Long running transactions should use this.
  54. */
  55. #define XFS_LOG_SLEEP 0x0
  56. #define XFS_LOG_NOSLEEP 0x1
  57. #define XFS_LOG_PERM_RESERV 0x2
  58. /*
  59. * Flags to xfs_log_force()
  60. *
  61. * XFS_LOG_SYNC: Synchronous force in-core log to disk
  62. * XFS_LOG_FORCE: Start in-core log write now.
  63. * XFS_LOG_URGE: Start write within some window of time.
  64. *
  65. * Note: Either XFS_LOG_FORCE or XFS_LOG_URGE must be set.
  66. */
  67. #define XFS_LOG_SYNC 0x1
  68. #define XFS_LOG_FORCE 0x2
  69. #define XFS_LOG_URGE 0x4
  70. #endif /* __KERNEL__ */
  71. /* Log Clients */
  72. #define XFS_TRANSACTION 0x69
  73. #define XFS_VOLUME 0x2
  74. #define XFS_LOG 0xaa
  75. /* Region types for iovec's i_type */
  76. #define XLOG_REG_TYPE_BFORMAT 1
  77. #define XLOG_REG_TYPE_BCHUNK 2
  78. #define XLOG_REG_TYPE_EFI_FORMAT 3
  79. #define XLOG_REG_TYPE_EFD_FORMAT 4
  80. #define XLOG_REG_TYPE_IFORMAT 5
  81. #define XLOG_REG_TYPE_ICORE 6
  82. #define XLOG_REG_TYPE_IEXT 7
  83. #define XLOG_REG_TYPE_IBROOT 8
  84. #define XLOG_REG_TYPE_ILOCAL 9
  85. #define XLOG_REG_TYPE_IATTR_EXT 10
  86. #define XLOG_REG_TYPE_IATTR_BROOT 11
  87. #define XLOG_REG_TYPE_IATTR_LOCAL 12
  88. #define XLOG_REG_TYPE_QFORMAT 13
  89. #define XLOG_REG_TYPE_DQUOT 14
  90. #define XLOG_REG_TYPE_QUOTAOFF 15
  91. #define XLOG_REG_TYPE_LRHEADER 16
  92. #define XLOG_REG_TYPE_UNMOUNT 17
  93. #define XLOG_REG_TYPE_COMMIT 18
  94. #define XLOG_REG_TYPE_TRANSHDR 19
  95. #define XLOG_REG_TYPE_MAX 19
  96. #define XLOG_VEC_SET_TYPE(vecp, t) ((vecp)->i_type = (t))
  97. typedef struct xfs_log_iovec {
  98. xfs_caddr_t i_addr; /* beginning address of region */
  99. int i_len; /* length in bytes of region */
  100. uint i_type; /* type of region */
  101. } xfs_log_iovec_t;
  102. typedef void* xfs_log_ticket_t;
  103. /*
  104. * Structure used to pass callback function and the function's argument
  105. * to the log manager.
  106. */
  107. typedef struct xfs_log_callback {
  108. struct xfs_log_callback *cb_next;
  109. void (*cb_func)(void *, int);
  110. void *cb_arg;
  111. } xfs_log_callback_t;
  112. #ifdef __KERNEL__
  113. /* Log manager interfaces */
  114. struct xfs_mount;
  115. xfs_lsn_t xfs_log_done(struct xfs_mount *mp,
  116. xfs_log_ticket_t ticket,
  117. void **iclog,
  118. uint flags);
  119. int _xfs_log_force(struct xfs_mount *mp,
  120. xfs_lsn_t lsn,
  121. uint flags,
  122. int *log_forced);
  123. #define xfs_log_force(mp, lsn, flags) \
  124. _xfs_log_force(mp, lsn, flags, NULL);
  125. int xfs_log_mount(struct xfs_mount *mp,
  126. struct xfs_buftarg *log_target,
  127. xfs_daddr_t start_block,
  128. int num_bblocks);
  129. int xfs_log_mount_finish(struct xfs_mount *mp, int);
  130. void xfs_log_move_tail(struct xfs_mount *mp,
  131. xfs_lsn_t tail_lsn);
  132. int xfs_log_notify(struct xfs_mount *mp,
  133. void *iclog,
  134. xfs_log_callback_t *callback_entry);
  135. int xfs_log_release_iclog(struct xfs_mount *mp,
  136. void *iclog_hndl);
  137. int xfs_log_reserve(struct xfs_mount *mp,
  138. int length,
  139. int count,
  140. xfs_log_ticket_t *ticket,
  141. __uint8_t clientid,
  142. uint flags,
  143. uint t_type);
  144. int xfs_log_write(struct xfs_mount *mp,
  145. xfs_log_iovec_t region[],
  146. int nentries,
  147. xfs_log_ticket_t ticket,
  148. xfs_lsn_t *start_lsn);
  149. int xfs_log_unmount(struct xfs_mount *mp);
  150. int xfs_log_unmount_write(struct xfs_mount *mp);
  151. void xfs_log_unmount_dealloc(struct xfs_mount *mp);
  152. int xfs_log_force_umount(struct xfs_mount *mp, int logerror);
  153. int xfs_log_need_covered(struct xfs_mount *mp);
  154. void xlog_iodone(struct xfs_buf *);
  155. #endif
  156. extern int xlog_debug; /* set to 1 to enable real log */
  157. #endif /* __XFS_LOG_H__ */