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
14 struct page;
15 struct address_space;
16
17 struct pagevec {
18 unsigned long nr;
19 unsigned long cold;
20 struct page *pages[PAGEVEC_SIZE];
21 };
22
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,
28 pgoff_t *indices);
29 void pagevec_remove_exceptionals(struct pagevec *pvec);
30 unsigned pagevec_lookup(struct pagevec *pvec, struct address_space *mapping,
31 pgoff_t start, unsigned nr_pages);
32 unsigned pagevec_lookup_tag(struct pagevec *pvec,
33 struct address_space *mapping, pgoff_t *index, int tag,
34 unsigned nr_pages);
35
36 static inline void pagevec_init(struct pagevec *pvec, int cold)
37 {
38 pvec->nr = 0;
39 pvec->cold = cold;
40 }
41
42 static inline void pagevec_reinit(struct pagevec *pvec)
43 {
44 pvec->nr = 0;
45 }
46
47 static inline unsigned pagevec_count(struct pagevec *pvec)
48 {
49 return pvec->nr;
50 }
51
52 static 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 */
60 static inline unsigned pagevec_add(struct pagevec *pvec, struct page *page)
61 {
62 pvec->pages[pvec->nr++] = page;
63 return pagevec_space(pvec);
64 }
65
66 static 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
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