pagevec.h 2.0 KB

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  1. /*
  2. * include/linux/pagevec.h
  3. *
  4. * In many places it is efficient to batch an operation up against multiple
  5. * pages. A pagevec is a multipage container which is used for that.
  6. */
  7. #ifndef _LINUX_PAGEVEC_H
  8. #define _LINUX_PAGEVEC_H
  9. /* 14 pointers + two long's align the pagevec structure to a power of two */
  10. #define PAGEVEC_SIZE 14
  11. struct page;
  12. struct address_space;
  13. struct pagevec {
  14. unsigned long nr;
  15. unsigned long cold;
  16. struct page *pages[PAGEVEC_SIZE];
  17. };
  18. void __pagevec_release(struct pagevec *pvec);
  19. void __pagevec_release_nonlru(struct pagevec *pvec);
  20. void __pagevec_free(struct pagevec *pvec);
  21. void __pagevec_lru_add(struct pagevec *pvec);
  22. void __pagevec_lru_add_active(struct pagevec *pvec);
  23. void pagevec_strip(struct pagevec *pvec);
  24. unsigned pagevec_lookup(struct pagevec *pvec, struct address_space *mapping,
  25. pgoff_t start, unsigned nr_pages);
  26. unsigned pagevec_lookup_tag(struct pagevec *pvec,
  27. struct address_space *mapping, pgoff_t *index, int tag,
  28. unsigned nr_pages);
  29. static inline void pagevec_init(struct pagevec *pvec, int cold)
  30. {
  31. pvec->nr = 0;
  32. pvec->cold = cold;
  33. }
  34. static inline void pagevec_reinit(struct pagevec *pvec)
  35. {
  36. pvec->nr = 0;
  37. }
  38. static inline unsigned pagevec_count(struct pagevec *pvec)
  39. {
  40. return pvec->nr;
  41. }
  42. static inline unsigned pagevec_space(struct pagevec *pvec)
  43. {
  44. return PAGEVEC_SIZE - pvec->nr;
  45. }
  46. /*
  47. * Add a page to a pagevec. Returns the number of slots still available.
  48. */
  49. static inline unsigned pagevec_add(struct pagevec *pvec, struct page *page)
  50. {
  51. pvec->pages[pvec->nr++] = page;
  52. return pagevec_space(pvec);
  53. }
  54. static inline void pagevec_release(struct pagevec *pvec)
  55. {
  56. if (pagevec_count(pvec))
  57. __pagevec_release(pvec);
  58. }
  59. static inline void pagevec_release_nonlru(struct pagevec *pvec)
  60. {
  61. if (pagevec_count(pvec))
  62. __pagevec_release_nonlru(pvec);
  63. }
  64. static inline void pagevec_free(struct pagevec *pvec)
  65. {
  66. if (pagevec_count(pvec))
  67. __pagevec_free(pvec);
  68. }
  69. static inline void pagevec_lru_add(struct pagevec *pvec)
  70. {
  71. if (pagevec_count(pvec))
  72. __pagevec_lru_add(pvec);
  73. }
  74. #endif /* _LINUX_PAGEVEC_H */