2 * include/linux/pagevec.h
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.
8 #ifndef _LINUX_PAGEVEC_H
9 #define _LINUX_PAGEVEC_H
11 /* 14 pointers + two long's align the pagevec structure to a power of two */
12 #define PAGEVEC_SIZE 14
20 struct page *pages[PAGEVEC_SIZE];
23 void __pagevec_release(struct pagevec *pvec);
24 void __pagevec_lru_add(struct pagevec *pvec);
25 unsigned pagevec_lookup_entries(struct pagevec *pvec,
26 struct address_space *mapping,
27 pgoff_t start, unsigned nr_entries,
29 void pagevec_remove_exceptionals(struct pagevec *pvec);
30 unsigned pagevec_lookup_range(struct pagevec *pvec,
31 struct address_space *mapping,
32 pgoff_t *start, pgoff_t end);
33 static inline unsigned pagevec_lookup(struct pagevec *pvec,
34 struct address_space *mapping,
37 return pagevec_lookup_range(pvec, mapping, start, (pgoff_t)-1);
40 unsigned pagevec_lookup_tag(struct pagevec *pvec,
41 struct address_space *mapping, pgoff_t *index, int tag,
44 static inline void pagevec_init(struct pagevec *pvec, int cold)
50 static inline void pagevec_reinit(struct pagevec *pvec)
55 static inline unsigned pagevec_count(struct pagevec *pvec)
60 static inline unsigned pagevec_space(struct pagevec *pvec)
62 return PAGEVEC_SIZE - pvec->nr;
66 * Add a page to a pagevec. Returns the number of slots still available.
68 static inline unsigned pagevec_add(struct pagevec *pvec, struct page *page)
70 pvec->pages[pvec->nr++] = page;
71 return pagevec_space(pvec);
74 static inline void pagevec_release(struct pagevec *pvec)
76 if (pagevec_count(pvec))
77 __pagevec_release(pvec);
80 #endif /* _LINUX_PAGEVEC_H */