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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_lru_add(struct pagevec *pvec);
 25 unsigned pagevec_lookup_entries(struct pagevec *pvec,
 26                                 struct address_space *mapping,
 27                                 pgoff_t start, unsigned nr_entries,
 28                                 pgoff_t *indices);
 29 void pagevec_remove_exceptionals(struct pagevec *pvec);
 30 unsigned pagevec_lookup(struct pagevec *pvec, struct address_space *mapping,
 31                 pgoff_t start, unsigned nr_pages);
 32 unsigned pagevec_lookup_tag(struct pagevec *pvec,
 33                 struct address_space *mapping, pgoff_t *index, int tag,
 34                 unsigned nr_pages);
 35 
 36 static inline void pagevec_init(struct pagevec *pvec, int cold)
 37 {
 38         pvec->nr = 0;
 39         pvec->cold = cold;
 40 }
 41 
 42 static inline void pagevec_reinit(struct pagevec *pvec)
 43 {
 44         pvec->nr = 0;
 45 }
 46 
 47 static inline unsigned pagevec_count(struct pagevec *pvec)
 48 {
 49         return pvec->nr;
 50 }
 51 
 52 static inline unsigned pagevec_space(struct pagevec *pvec)
 53 {
 54         return PAGEVEC_SIZE - pvec->nr;
 55 }
 56 
 57 /*
 58  * Add a page to a pagevec.  Returns the number of slots still available.
 59  */
 60 static inline unsigned pagevec_add(struct pagevec *pvec, struct page *page)
 61 {
 62         pvec->pages[pvec->nr++] = page;
 63         return pagevec_space(pvec);
 64 }
 65 
 66 static inline void pagevec_release(struct pagevec *pvec)
 67 {
 68         if (pagevec_count(pvec))
 69                 __pagevec_release(pvec);
 70 }
 71 
 72 #endif /* _LINUX_PAGEVEC_H */
 73 

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