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_release_nonlru(struct pagevec *pvec);
25void __pagevec_free(struct pagevec *pvec);
26void __pagevec_lru_add(struct pagevec *pvec);
27void __pagevec_lru_add_active(struct pagevec *pvec);
28void pagevec_strip(struct pagevec *pvec);
29unsigned pagevec_lookup(struct pagevec *pvec, struct address_space *mapping,
30		pgoff_t start, unsigned nr_pages);
31unsigned pagevec_lookup_tag(struct pagevec *pvec,
32		struct address_space *mapping, pgoff_t *index, int tag,
33		unsigned nr_pages);
34
35static inline void pagevec_init(struct pagevec *pvec, int cold)
36{
37	pvec->nr = 0;
38	pvec->cold = cold;
39}
40
41static inline void pagevec_reinit(struct pagevec *pvec)
42{
43	pvec->nr = 0;
44}
45
46static inline unsigned pagevec_count(struct pagevec *pvec)
47{
48	return pvec->nr;
49}
50
51static inline unsigned pagevec_space(struct pagevec *pvec)
52{
53	return PAGEVEC_SIZE - pvec->nr;
54}
55
56/*
57 * Add a page to a pagevec.  Returns the number of slots still available.
58 */
59static inline unsigned pagevec_add(struct pagevec *pvec, struct page *page)
60{
61	pvec->pages[pvec->nr++] = page;
62	return pagevec_space(pvec);
63}
64
65
66static inline void pagevec_release(struct pagevec *pvec)
67{
68	if (pagevec_count(pvec))
69		__pagevec_release(pvec);
70}
71
72static inline void pagevec_release_nonlru(struct pagevec *pvec)
73{
74	if (pagevec_count(pvec))
75		__pagevec_release_nonlru(pvec);
76}
77
78static inline void pagevec_free(struct pagevec *pvec)
79{
80	if (pagevec_count(pvec))
81		__pagevec_free(pvec);
82}
83
84static inline void pagevec_lru_add(struct pagevec *pvec)
85{
86	if (pagevec_count(pvec))
87		__pagevec_lru_add(pvec);
88}
89
90#endif /* _LINUX_PAGEVEC_H */
91