Eric Lee / smarc-fsl-linux-kernel

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include/linux/pagevec.h 2.22 KB
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1da177e4c   Linus Torvalds   Linux-2.6.12-rc2 
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  /*
   * include/linux/pagevec.h
   *
   * In many places it is efficient to batch an operation up against multiple
   * pages.  A pagevec is a multipage container which is used for that.
   */
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  #ifndef _LINUX_PAGEVEC_H
  #define _LINUX_PAGEVEC_H
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  /* 14 pointers + two long's align the pagevec structure to a power of two */
  #define PAGEVEC_SIZE	14
  
  struct page;
  struct address_space;
  
  struct pagevec {
  	unsigned long nr;
  	unsigned long cold;
  	struct page *pages[PAGEVEC_SIZE];
  };
  
  void __pagevec_release(struct pagevec *pvec);
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  void __pagevec_lru_add(struct pagevec *pvec, enum lru_list lru);
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  unsigned pagevec_lookup(struct pagevec *pvec, struct address_space *mapping,
  		pgoff_t start, unsigned nr_pages);
  unsigned pagevec_lookup_tag(struct pagevec *pvec,
  		struct address_space *mapping, pgoff_t *index, int tag,
  		unsigned nr_pages);
  
  static inline void pagevec_init(struct pagevec *pvec, int cold)
  {
  	pvec->nr = 0;
  	pvec->cold = cold;
  }
  
  static inline void pagevec_reinit(struct pagevec *pvec)
  {
  	pvec->nr = 0;
  }
  
  static inline unsigned pagevec_count(struct pagevec *pvec)
  {
  	return pvec->nr;
  }
  
  static inline unsigned pagevec_space(struct pagevec *pvec)
  {
  	return PAGEVEC_SIZE - pvec->nr;
  }
  
  /*
   * Add a page to a pagevec.  Returns the number of slots still available.
   */
  static inline unsigned pagevec_add(struct pagevec *pvec, struct page *page)
  {
  	pvec->pages[pvec->nr++] = page;
  	return pagevec_space(pvec);
  }
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  static inline void pagevec_release(struct pagevec *pvec)
  {
  	if (pagevec_count(pvec))
  		__pagevec_release(pvec);
  }
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  static inline void __pagevec_lru_add_anon(struct pagevec *pvec)
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  {
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  	__pagevec_lru_add(pvec, LRU_INACTIVE_ANON);
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  }
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  static inline void __pagevec_lru_add_active_anon(struct pagevec *pvec)
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  {
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  	__pagevec_lru_add(pvec, LRU_ACTIVE_ANON);
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  }
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  static inline void __pagevec_lru_add_file(struct pagevec *pvec)
  {
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  	__pagevec_lru_add(pvec, LRU_INACTIVE_FILE);
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  }
  
  static inline void __pagevec_lru_add_active_file(struct pagevec *pvec)
  {
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  	__pagevec_lru_add(pvec, LRU_ACTIVE_FILE);
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  }
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  static inline void pagevec_lru_add_file(struct pagevec *pvec)
  {
  	if (pagevec_count(pvec))
  		__pagevec_lru_add_file(pvec);
  }
  
  static inline void pagevec_lru_add_anon(struct pagevec *pvec)
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  {
  	if (pagevec_count(pvec))
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  		__pagevec_lru_add_anon(pvec);
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  }
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  #endif /* _LINUX_PAGEVEC_H */