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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(struct pagevec *pvec, struct address_space *mapping,
26 pgoff_t start, unsigned nr_pages);
27unsigned pagevec_lookup_tag(struct pagevec *pvec,
28 struct address_space *mapping, pgoff_t *index, int tag,
29 unsigned nr_pages);
30
31static inline void pagevec_init(struct pagevec *pvec, int cold)
32{
33 pvec->nr = 0;
34 pvec->cold = cold;
35}
36
37static inline void pagevec_reinit(struct pagevec *pvec)
38{
39 pvec->nr = 0;
40}
41
42static inline unsigned pagevec_count(struct pagevec *pvec)
43{
44 return pvec->nr;
45}
46
47static inline unsigned pagevec_space(struct pagevec *pvec)
48{
49 return PAGEVEC_SIZE - pvec->nr;
50}
51
52/*
53 * Add a page to a pagevec. Returns the number of slots still available.
54 */
55static inline unsigned pagevec_add(struct pagevec *pvec, struct page *page)
56{
57 pvec->pages[pvec->nr++] = page;
58 return pagevec_space(pvec);
59}
60
61static inline void pagevec_release(struct pagevec *pvec)
62{
63 if (pagevec_count(pvec))
64 __pagevec_release(pvec);
65}
66
67#endif /* _LINUX_PAGEVEC_H */