Linux kernel mirror (for testing)
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linux
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_lru_add(struct pagevec *pvec);
25unsigned pagevec_lookup_entries(struct pagevec *pvec,
26 struct address_space *mapping,
27 pgoff_t start, unsigned nr_entries,
28 pgoff_t *indices);
29void pagevec_remove_exceptionals(struct pagevec *pvec);
30unsigned pagevec_lookup_range(struct pagevec *pvec,
31 struct address_space *mapping,
32 pgoff_t *start, pgoff_t end);
33static inline unsigned pagevec_lookup(struct pagevec *pvec,
34 struct address_space *mapping,
35 pgoff_t *start)
36{
37 return pagevec_lookup_range(pvec, mapping, start, (pgoff_t)-1);
38}
39
40unsigned pagevec_lookup_tag(struct pagevec *pvec,
41 struct address_space *mapping, pgoff_t *index, int tag,
42 unsigned nr_pages);
43
44static inline void pagevec_init(struct pagevec *pvec, int cold)
45{
46 pvec->nr = 0;
47 pvec->cold = cold;
48}
49
50static inline void pagevec_reinit(struct pagevec *pvec)
51{
52 pvec->nr = 0;
53}
54
55static inline unsigned pagevec_count(struct pagevec *pvec)
56{
57 return pvec->nr;
58}
59
60static inline unsigned pagevec_space(struct pagevec *pvec)
61{
62 return PAGEVEC_SIZE - pvec->nr;
63}
64
65/*
66 * Add a page to a pagevec. Returns the number of slots still available.
67 */
68static inline unsigned pagevec_add(struct pagevec *pvec, struct page *page)
69{
70 pvec->pages[pvec->nr++] = page;
71 return pagevec_space(pvec);
72}
73
74static inline void pagevec_release(struct pagevec *pvec)
75{
76 if (pagevec_count(pvec))
77 __pagevec_release(pvec);
78}
79
80#endif /* _LINUX_PAGEVEC_H */