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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 #include <linux/xarray.h>
 13 
 14 /* 15 pointers + header align the pagevec structure to a power of two */
 15 #define PAGEVEC_SIZE    15
 16 
 17 struct page;
 18 struct address_space;
 19 
 20 struct pagevec {
 21         unsigned char nr;
 22         bool percpu_pvec_drained;
 23         struct page *pages[PAGEVEC_SIZE];
 24 };
 25 
 26 void __pagevec_release(struct pagevec *pvec);
 27 void __pagevec_lru_add(struct pagevec *pvec);
 28 unsigned pagevec_lookup_entries(struct pagevec *pvec,
 29                                 struct address_space *mapping,
 30                                 pgoff_t start, unsigned nr_entries,
 31                                 pgoff_t *indices);
 32 void pagevec_remove_exceptionals(struct pagevec *pvec);
 33 unsigned pagevec_lookup_range(struct pagevec *pvec,
 34                               struct address_space *mapping,
 35                               pgoff_t *start, pgoff_t end);
 36 static inline unsigned pagevec_lookup(struct pagevec *pvec,
 37                                       struct address_space *mapping,
 38                                       pgoff_t *start)
 39 {
 40         return pagevec_lookup_range(pvec, mapping, start, (pgoff_t)-1);
 41 }
 42 
 43 unsigned pagevec_lookup_range_tag(struct pagevec *pvec,
 44                 struct address_space *mapping, pgoff_t *index, pgoff_t end,
 45                 xa_mark_t tag);
 46 unsigned pagevec_lookup_range_nr_tag(struct pagevec *pvec,
 47                 struct address_space *mapping, pgoff_t *index, pgoff_t end,
 48                 xa_mark_t tag, unsigned max_pages);
 49 static inline unsigned pagevec_lookup_tag(struct pagevec *pvec,
 50                 struct address_space *mapping, pgoff_t *index, xa_mark_t tag)
 51 {
 52         return pagevec_lookup_range_tag(pvec, mapping, index, (pgoff_t)-1, tag);
 53 }
 54 
 55 static inline void pagevec_init(struct pagevec *pvec)
 56 {
 57         pvec->nr = 0;
 58         pvec->percpu_pvec_drained = false;
 59 }
 60 
 61 static inline void pagevec_reinit(struct pagevec *pvec)
 62 {
 63         pvec->nr = 0;
 64 }
 65 
 66 static inline unsigned pagevec_count(struct pagevec *pvec)
 67 {
 68         return pvec->nr;
 69 }
 70 
 71 static inline unsigned pagevec_space(struct pagevec *pvec)
 72 {
 73         return PAGEVEC_SIZE - pvec->nr;
 74 }
 75 
 76 /*
 77  * Add a page to a pagevec.  Returns the number of slots still available.
 78  */
 79 static inline unsigned pagevec_add(struct pagevec *pvec, struct page *page)
 80 {
 81         pvec->pages[pvec->nr++] = page;
 82         return pagevec_space(pvec);
 83 }
 84 
 85 static inline void pagevec_release(struct pagevec *pvec)
 86 {
 87         if (pagevec_count(pvec))
 88                 __pagevec_release(pvec);
 89 }
 90 
 91 #endif /* _LINUX_PAGEVEC_H */
 92 

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