/kern_oII/include/linux/pagevec.h

http://omnia2droid.googlecode.com/ · C++ Header · 108 lines · 78 code · 20 blank · 10 comment · 4 complexity · 182b0dff90121eb375b5102ec2a9ad20 MD5 · raw file 

    

  1. /*
    2. 

  2.  * include/linux/pagevec.h
    3. 

  3.  *
    4. 

  4.  * In many places it is efficient to batch an operation up against multiple
    5. 

  5.  * pages.  A pagevec is a multipage container which is used for that.
    6. 

  6.  */
    7. 

  7. 

  8. #ifndef _LINUX_PAGEVEC_H
    9. 

  9. #define _LINUX_PAGEVEC_H
    10. 

  10. 

  11. /* 14 pointers + two long's align the pagevec structure to a power of two */
    12. 

  12. #define PAGEVEC_SIZE	14
    13. 

  13. 

  14. struct page;
    15. 

  15. struct address_space;
    16. 

  16. 

  17. struct pagevec {
    18. 

  18. 	unsigned long nr;
    19. 

  19. 	unsigned long cold;
    20. 

  20. 	struct page *pages[PAGEVEC_SIZE];
    21. 

  21. };
    22. 

  22. 

  23. void __pagevec_release(struct pagevec *pvec);
    24. 

  24. void __pagevec_free(struct pagevec *pvec);
    25. 

  25. void ____pagevec_lru_add(struct pagevec *pvec, enum lru_list lru);
    26. 

  26. void pagevec_strip(struct pagevec *pvec);
    27. 

  27. unsigned pagevec_lookup(struct pagevec *pvec, struct address_space *mapping,
    28. 

  28. 		pgoff_t start, unsigned nr_pages);
    29. 

  29. unsigned pagevec_lookup_tag(struct pagevec *pvec,
    30. 

  30. 		struct address_space *mapping, pgoff_t *index, int tag,
    31. 

  31. 		unsigned nr_pages);
    32. 

  32. 

  33. static inline void pagevec_init(struct pagevec *pvec, int cold)
    34. 

  34. {
    35. 

  35. 	pvec->nr = 0;
    36. 

  36. 	pvec->cold = cold;
    37. 

  37. }
    38. 

  38. 

  39. static inline void pagevec_reinit(struct pagevec *pvec)
    40. 

  40. {
    41. 

  41. 	pvec->nr = 0;
    42. 

  42. }
    43. 

  43. 

  44. static inline unsigned pagevec_count(struct pagevec *pvec)
    45. 

  45. {
    46. 

  46. 	return pvec->nr;
    47. 

  47. }
    48. 

  48. 

  49. static inline unsigned pagevec_space(struct pagevec *pvec)
    50. 

  50. {
    51. 

  51. 	return PAGEVEC_SIZE - pvec->nr;
    52. 

  52. }
    53. 

  53. 

  54. /*
    55. 

  55.  * Add a page to a pagevec.  Returns the number of slots still available.
    56. 

  56.  */
    57. 

  57. static inline unsigned pagevec_add(struct pagevec *pvec, struct page *page)
    58. 

  58. {
    59. 

  59. 	pvec->pages[pvec->nr++] = page;
    60. 

  60. 	return pagevec_space(pvec);
    61. 

  61. }
    62. 

  62. 

  63. 

  64. static inline void pagevec_release(struct pagevec *pvec)
    65. 

  65. {
    66. 

  66. 	if (pagevec_count(pvec))
    67. 

  67. 		__pagevec_release(pvec);
    68. 

  68. }
    69. 

  69. 

  70. static inline void pagevec_free(struct pagevec *pvec)
    71. 

  71. {
    72. 

  72. 	if (pagevec_count(pvec))
    73. 

  73. 		__pagevec_free(pvec);
    74. 

  74. }
    75. 

  75. 

  76. static inline void __pagevec_lru_add_anon(struct pagevec *pvec)
    77. 

  77. {
    78. 

  78. 	____pagevec_lru_add(pvec, LRU_INACTIVE_ANON);
    79. 

  79. }
    80. 

  80. 

  81. static inline void __pagevec_lru_add_active_anon(struct pagevec *pvec)
    82. 

  82. {
    83. 

  83. 	____pagevec_lru_add(pvec, LRU_ACTIVE_ANON);
    84. 

  84. }
    85. 

  85. 

  86. static inline void __pagevec_lru_add_file(struct pagevec *pvec)
    87. 

  87. {
    88. 

  88. 	____pagevec_lru_add(pvec, LRU_INACTIVE_FILE);
    89. 

  89. }
    90. 

  90. 

  91. static inline void __pagevec_lru_add_active_file(struct pagevec *pvec)
    92. 

  92. {
    93. 

  93. 	____pagevec_lru_add(pvec, LRU_ACTIVE_FILE);
    94. 

  94. }
    95. 

  95. 

  96. static inline void pagevec_lru_add_file(struct pagevec *pvec)
    97. 

  97. {
    98. 

  98. 	if (pagevec_count(pvec))
    99. 

  99. 		__pagevec_lru_add_file(pvec);
    100. 

  100. }
    101. 

  101. 

  102. static inline void pagevec_lru_add_anon(struct pagevec *pvec)
    103. 

  103. {
    104. 

  104. 	if (pagevec_count(pvec))
    105. 

  105. 		__pagevec_lru_add_anon(pvec);
    106. 

  106. }
    107. 

  107. 

  108. #endif /* _LINUX_PAGEVEC_H */
    109.