jfs_metapage.h 3.5 KB

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  1. /* SPDX-License-Identifier: GPL-2.0-or-later */
  2. /*
  3. * Copyright (C) International Business Machines Corp., 2000-2002
  4. * Portions Copyright (C) Christoph Hellwig, 2001-2002
  5. */
  6. #ifndef _H_JFS_METAPAGE
  7. #define _H_JFS_METAPAGE
  8. #include <linux/pagemap.h>
  9. struct metapage {
  10. /* Common logsyncblk prefix (see jfs_logmgr.h) */
  11. u16 xflag;
  12. u16 unused;
  13. lid_t lid;
  14. int lsn;
  15. struct list_head synclist;
  16. /* End of logsyncblk prefix */
  17. unsigned long flag; /* See Below */
  18. unsigned long count; /* Reference count */
  19. void *data; /* Data pointer */
  20. sector_t index; /* block address of page */
  21. wait_queue_head_t wait;
  22. /* implementation */
  23. struct page *page;
  24. struct super_block *sb;
  25. unsigned int logical_size;
  26. /* Journal management */
  27. int clsn;
  28. int nohomeok;
  29. struct jfs_log *log;
  30. };
  31. /* metapage flag */
  32. #define META_locked 0
  33. #define META_dirty 2
  34. #define META_sync 3
  35. #define META_discard 4
  36. #define META_forcewrite 5
  37. #define META_io 6
  38. #define mark_metapage_dirty(mp) set_bit(META_dirty, &(mp)->flag)
  39. /* function prototypes */
  40. extern int metapage_init(void);
  41. extern void metapage_exit(void);
  42. extern struct metapage *__get_metapage(struct inode *inode,
  43. unsigned long lblock, unsigned int size,
  44. int absolute, unsigned long new);
  45. #define read_metapage(inode, lblock, size, absolute)\
  46. __get_metapage(inode, lblock, size, absolute, false)
  47. #define get_metapage(inode, lblock, size, absolute)\
  48. __get_metapage(inode, lblock, size, absolute, true)
  49. extern void release_metapage(struct metapage *);
  50. extern void grab_metapage(struct metapage *);
  51. extern void force_metapage(struct metapage *);
  52. /*
  53. * hold_metapage and put_metapage are used in conjunction. The page lock
  54. * is not dropped between the two, so no other threads can get or release
  55. * the metapage
  56. */
  57. extern void hold_metapage(struct metapage *);
  58. extern void put_metapage(struct metapage *);
  59. static inline void write_metapage(struct metapage *mp)
  60. {
  61. set_bit(META_dirty, &mp->flag);
  62. release_metapage(mp);
  63. }
  64. static inline void flush_metapage(struct metapage *mp)
  65. {
  66. set_bit(META_sync, &mp->flag);
  67. write_metapage(mp);
  68. }
  69. static inline void discard_metapage(struct metapage *mp)
  70. {
  71. clear_bit(META_dirty, &mp->flag);
  72. set_bit(META_discard, &mp->flag);
  73. release_metapage(mp);
  74. }
  75. static inline void metapage_nohomeok(struct metapage *mp)
  76. {
  77. struct page *page = mp->page;
  78. lock_page(page);
  79. if (!mp->nohomeok++) {
  80. mark_metapage_dirty(mp);
  81. get_page(page);
  82. wait_on_page_writeback(page);
  83. }
  84. unlock_page(page);
  85. }
  86. /*
  87. * This serializes access to mp->lsn when metapages are added to logsynclist
  88. * without setting nohomeok. i.e. updating imap & dmap
  89. */
  90. static inline void metapage_wait_for_io(struct metapage *mp)
  91. {
  92. if (test_bit(META_io, &mp->flag))
  93. wait_on_page_writeback(mp->page);
  94. }
  95. /*
  96. * This is called when already holding the metapage
  97. */
  98. static inline void _metapage_homeok(struct metapage *mp)
  99. {
  100. if (!--mp->nohomeok)
  101. put_page(mp->page);
  102. }
  103. static inline void metapage_homeok(struct metapage *mp)
  104. {
  105. hold_metapage(mp);
  106. _metapage_homeok(mp);
  107. put_metapage(mp);
  108. }
  109. extern const struct address_space_operations jfs_metapage_aops;
  110. /*
  111. * This routines invalidate all pages for an extent.
  112. */
  113. extern void __invalidate_metapages(struct inode *, s64, int);
  114. #define invalidate_pxd_metapages(ip, pxd) \
  115. __invalidate_metapages((ip), addressPXD(&(pxd)), lengthPXD(&(pxd)))
  116. #define invalidate_dxd_metapages(ip, dxd) \
  117. __invalidate_metapages((ip), addressDXD(&(dxd)), lengthDXD(&(dxd)))
  118. #define invalidate_xad_metapages(ip, xad) \
  119. __invalidate_metapages((ip), addressXAD(&(xad)), lengthXAD(&(xad)))
  120. #endif /* _H_JFS_METAPAGE */