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Linux/include/linux/pagevec.h

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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 
  8 #ifndef _LINUX_PAGEVEC_H
  9 #define _LINUX_PAGEVEC_H
 10 
 11 /* 14 pointers + two long's align the pagevec structure to a power of two */
 12 #define PAGEVEC_SIZE    14
 13 
 14 struct page;
 15 struct address_space;
 16 
 17 struct pagevec {
 18         unsigned long nr;
 19         unsigned long cold;
 20         struct page *pages[PAGEVEC_SIZE];
 21 };
 22 
 23 void __pagevec_release(struct pagevec *pvec);
 24 void __pagevec_free(struct pagevec *pvec);
 25 void ____pagevec_lru_add(struct pagevec *pvec, enum lru_list lru);
 26 void pagevec_strip(struct pagevec *pvec);
 27 unsigned pagevec_lookup(struct pagevec *pvec, struct address_space *mapping,
 28                 pgoff_t start, unsigned nr_pages);
 29 unsigned pagevec_lookup_tag(struct pagevec *pvec,
 30                 struct address_space *mapping, pgoff_t *index, int tag,
 31                 unsigned nr_pages);
 32 
 33 static inline void pagevec_init(struct pagevec *pvec, int cold)
 34 {
 35         pvec->nr = 0;
 36         pvec->cold = cold;
 37 }
 38 
 39 static inline void pagevec_reinit(struct pagevec *pvec)
 40 {
 41         pvec->nr = 0;
 42 }
 43 
 44 static inline unsigned pagevec_count(struct pagevec *pvec)
 45 {
 46         return pvec->nr;
 47 }
 48 
 49 static inline unsigned pagevec_space(struct pagevec *pvec)
 50 {
 51         return PAGEVEC_SIZE - pvec->nr;
 52 }
 53 
 54 /*
 55  * Add a page to a pagevec.  Returns the number of slots still available.
 56  */
 57 static inline unsigned pagevec_add(struct pagevec *pvec, struct page *page)
 58 {
 59         pvec->pages[pvec->nr++] = page;
 60         return pagevec_space(pvec);
 61 }
 62 
 63 
 64 static inline void pagevec_release(struct pagevec *pvec)
 65 {
 66         if (pagevec_count(pvec))
 67                 __pagevec_release(pvec);
 68 }
 69 
 70 static inline void pagevec_free(struct pagevec *pvec)
 71 {
 72         if (pagevec_count(pvec))
 73                 __pagevec_free(pvec);
 74 }
 75 
 76 static inline void __pagevec_lru_add_anon(struct pagevec *pvec)
 77 {
 78         ____pagevec_lru_add(pvec, LRU_INACTIVE_ANON);
 79 }
 80 
 81 static inline void __pagevec_lru_add_active_anon(struct pagevec *pvec)
 82 {
 83         ____pagevec_lru_add(pvec, LRU_ACTIVE_ANON);
 84 }
 85 
 86 static inline void __pagevec_lru_add_file(struct pagevec *pvec)
 87 {
 88         ____pagevec_lru_add(pvec, LRU_INACTIVE_FILE);
 89 }
 90 
 91 static inline void __pagevec_lru_add_active_file(struct pagevec *pvec)
 92 {
 93         ____pagevec_lru_add(pvec, LRU_ACTIVE_FILE);
 94 }
 95 
 96 static inline void pagevec_lru_add_file(struct pagevec *pvec)
 97 {
 98         if (pagevec_count(pvec))
 99                 __pagevec_lru_add_file(pvec);
100 }
101 
102 static inline void pagevec_lru_add_anon(struct pagevec *pvec)
103 {
104         if (pagevec_count(pvec))
105                 __pagevec_lru_add_anon(pvec);
106 }
107 
108 #endif /* _LINUX_PAGEVEC_H */
109 

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