LXR linux/include/linux/pagevec.h

   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_free(struct pagevec *pvec);
  25void ____pagevec_lru_add(struct pagevec *pvec, enum lru_list lru);
  26void pagevec_strip(struct pagevec *pvec);
  27unsigned pagevec_lookup(struct pagevec *pvec, struct address_space *mapping,
  28                pgoff_t start, unsigned nr_pages);
  29unsigned pagevec_lookup_tag(struct pagevec *pvec,
  30                struct address_space *mapping, pgoff_t *index, int tag,
  31                unsigned nr_pages);
  32
  33static inline void pagevec_init(struct pagevec *pvec, int cold)
  34{
  35        pvec->nr = 0;
  36        pvec->cold = cold;
  37}
  38
  39static inline void pagevec_reinit(struct pagevec *pvec)
  40{
  41        pvec->nr = 0;
  42}
  43
  44static inline unsigned pagevec_count(struct pagevec *pvec)
  45{
  46        return pvec->nr;
  47}
  48
  49static 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 */
  57static 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
  64static inline void pagevec_release(struct pagevec *pvec)
  65{
  66        if (pagevec_count(pvec))
  67                __pagevec_release(pvec);
  68}
  69
  70static inline void pagevec_free(struct pagevec *pvec)
  71{
  72        if (pagevec_count(pvec))
  73                __pagevec_free(pvec);
  74}
  75
  76static inline void __pagevec_lru_add_anon(struct pagevec *pvec)
  77{
  78        ____pagevec_lru_add(pvec, LRU_INACTIVE_ANON);
  79}
  80
  81static inline void __pagevec_lru_add_active_anon(struct pagevec *pvec)
  82{
  83        ____pagevec_lru_add(pvec, LRU_ACTIVE_ANON);
  84}
  85
  86static inline void __pagevec_lru_add_file(struct pagevec *pvec)
  87{
  88        ____pagevec_lru_add(pvec, LRU_INACTIVE_FILE);
  89}
  90
  91static inline void __pagevec_lru_add_active_file(struct pagevec *pvec)
  92{
  93        ____pagevec_lru_add(pvec, LRU_ACTIVE_FILE);
  94}
  95
  96static inline void pagevec_lru_add_file(struct pagevec *pvec)
  97{
  98        if (pagevec_count(pvec))
  99                __pagevec_lru_add_file(pvec);
 100}
 101
 102static 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