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TOMOYO Linux Cross Reference
Linux/include/linux/pagevec.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 /*
  3  * include/linux/pagevec.h
  4  *
  5  * In many places it is efficient to batch an operation up against multiple
  6  * pages.  A pagevec is a multipage container which is used for that.
  7  */
  8 
  9 #ifndef _LINUX_PAGEVEC_H
 10 #define _LINUX_PAGEVEC_H
 11 
 12 /* 15 pointers + header align the pagevec structure to a power of two */
 13 #define PAGEVEC_SIZE    15
 14 
 15 struct page;
 16 struct address_space;
 17 
 18 struct pagevec {
 19         unsigned char nr;
 20         bool percpu_pvec_drained;
 21         struct page *pages[PAGEVEC_SIZE];
 22 };
 23 
 24 void __pagevec_release(struct pagevec *pvec);
 25 void __pagevec_lru_add(struct pagevec *pvec);
 26 unsigned pagevec_lookup_entries(struct pagevec *pvec,
 27                                 struct address_space *mapping,
 28                                 pgoff_t start, unsigned nr_entries,
 29                                 pgoff_t *indices);
 30 void pagevec_remove_exceptionals(struct pagevec *pvec);
 31 unsigned pagevec_lookup_range(struct pagevec *pvec,
 32                               struct address_space *mapping,
 33                               pgoff_t *start, pgoff_t end);
 34 static inline unsigned pagevec_lookup(struct pagevec *pvec,
 35                                       struct address_space *mapping,
 36                                       pgoff_t *start)
 37 {
 38         return pagevec_lookup_range(pvec, mapping, start, (pgoff_t)-1);
 39 }
 40 
 41 unsigned pagevec_lookup_range_tag(struct pagevec *pvec,
 42                 struct address_space *mapping, pgoff_t *index, pgoff_t end,
 43                 int tag);
 44 unsigned pagevec_lookup_range_nr_tag(struct pagevec *pvec,
 45                 struct address_space *mapping, pgoff_t *index, pgoff_t end,
 46                 int tag, unsigned max_pages);
 47 static inline unsigned pagevec_lookup_tag(struct pagevec *pvec,
 48                 struct address_space *mapping, pgoff_t *index, int tag)
 49 {
 50         return pagevec_lookup_range_tag(pvec, mapping, index, (pgoff_t)-1, tag);
 51 }
 52 
 53 static inline void pagevec_init(struct pagevec *pvec)
 54 {
 55         pvec->nr = 0;
 56         pvec->percpu_pvec_drained = false;
 57 }
 58 
 59 static inline void pagevec_reinit(struct pagevec *pvec)
 60 {
 61         pvec->nr = 0;
 62 }
 63 
 64 static inline unsigned pagevec_count(struct pagevec *pvec)
 65 {
 66         return pvec->nr;
 67 }
 68 
 69 static inline unsigned pagevec_space(struct pagevec *pvec)
 70 {
 71         return PAGEVEC_SIZE - pvec->nr;
 72 }
 73 
 74 /*
 75  * Add a page to a pagevec.  Returns the number of slots still available.
 76  */
 77 static inline unsigned pagevec_add(struct pagevec *pvec, struct page *page)
 78 {
 79         pvec->pages[pvec->nr++] = page;
 80         return pagevec_space(pvec);
 81 }
 82 
 83 static inline void pagevec_release(struct pagevec *pvec)
 84 {
 85         if (pagevec_count(pvec))
 86                 __pagevec_release(pvec);
 87 }
 88 
 89 #endif /* _LINUX_PAGEVEC_H */
 90 

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