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(struct pagevec *pvec, struct address_space *mapping,
31		pgoff_t start, unsigned nr_pages);
32unsigned pagevec_lookup_tag(struct pagevec *pvec,
33		struct address_space *mapping, pgoff_t *index, int tag,
34		unsigned nr_pages);
35
36static inline void pagevec_init(struct pagevec *pvec, int cold)
37{
38	pvec->nr = 0;
39	pvec->cold = cold;
40}
41
42static inline void pagevec_reinit(struct pagevec *pvec)
43{
44	pvec->nr = 0;
45}
46
47static inline unsigned pagevec_count(struct pagevec *pvec)
48{
49	return pvec->nr;
50}
51
52static inline unsigned pagevec_space(struct pagevec *pvec)
53{
54	return PAGEVEC_SIZE - pvec->nr;
55}
56
57/*
58 * Add a page to a pagevec.  Returns the number of slots still available.
59 */
60static inline unsigned pagevec_add(struct pagevec *pvec, struct page *page)
61{
62	pvec->pages[pvec->nr++] = page;
63	return pagevec_space(pvec);
64}
65
66static inline void pagevec_release(struct pagevec *pvec)
67{
68	if (pagevec_count(pvec))
69		__pagevec_release(pvec);
70}
71
72#endif /* _LINUX_PAGEVEC_H */
73