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