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/* 14 pointers + two long's align the pagevec structure to a power of two */
9#define PAGEVEC_SIZE 14
10
11struct page;
12struct address_space;
13
14struct pagevec {
15 unsigned long nr;
16 unsigned long cold;
17 struct page *pages[PAGEVEC_SIZE];
18};
19
20void __pagevec_release(struct pagevec *pvec);
21void __pagevec_release_nonlru(struct pagevec *pvec);
22void __pagevec_free(struct pagevec *pvec);
23void __pagevec_lru_add(struct pagevec *pvec);
24void __pagevec_lru_add_active(struct pagevec *pvec);
25void pagevec_strip(struct pagevec *pvec);
26unsigned pagevec_lookup(struct pagevec *pvec, struct address_space *mapping,
27 pgoff_t start, unsigned nr_pages);
28unsigned pagevec_lookup_tag(struct pagevec *pvec,
29 struct address_space *mapping, pgoff_t *index, int tag,
30 unsigned nr_pages);
31
32static inline void pagevec_init(struct pagevec *pvec, int cold)
33{
34 pvec->nr = 0;
35 pvec->cold = cold;
36}
37
38static inline void pagevec_reinit(struct pagevec *pvec)
39{
40 pvec->nr = 0;
41}
42
43static inline unsigned pagevec_count(struct pagevec *pvec)
44{
45 return pvec->nr;
46}
47
48static inline unsigned pagevec_space(struct pagevec *pvec)
49{
50 return PAGEVEC_SIZE - pvec->nr;
51}
52
53/*
54 * Add a page to a pagevec. Returns the number of slots still available.
55 */
56static inline unsigned pagevec_add(struct pagevec *pvec, struct page *page)
57{
58 pvec->pages[pvec->nr++] = page;
59 return pagevec_space(pvec);
60}
61
62
63static inline void pagevec_release(struct pagevec *pvec)
64{
65 if (pagevec_count(pvec))
66 __pagevec_release(pvec);
67}
68
69static inline void pagevec_release_nonlru(struct pagevec *pvec)
70{
71 if (pagevec_count(pvec))
72 __pagevec_release_nonlru(pvec);
73}
74
75static inline void pagevec_free(struct pagevec *pvec)
76{
77 if (pagevec_count(pvec))
78 __pagevec_free(pvec);
79}
80
81static inline void pagevec_lru_add(struct pagevec *pvec)
82{
83 if (pagevec_count(pvec))
84 __pagevec_lru_add(pvec);
85}