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#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_free(struct pagevec *pvec);
25void ____pagevec_lru_add(struct pagevec *pvec, enum lru_list lru);
26void pagevec_strip(struct pagevec *pvec);
27unsigned pagevec_lookup(struct pagevec *pvec, struct address_space *mapping,
28 pgoff_t start, unsigned nr_pages);
29unsigned pagevec_lookup_tag(struct pagevec *pvec,
30 struct address_space *mapping, pgoff_t *index, int tag,
31 unsigned nr_pages);
32
33static inline void pagevec_init(struct pagevec *pvec, int cold)
34{
35 pvec->nr = 0;
36 pvec->cold = cold;
37}
38
39static inline void pagevec_reinit(struct pagevec *pvec)
40{
41 pvec->nr = 0;
42}
43
44static inline unsigned pagevec_count(struct pagevec *pvec)
45{
46 return pvec->nr;
47}
48
49static inline unsigned pagevec_space(struct pagevec *pvec)
50{
51 return PAGEVEC_SIZE - pvec->nr;
52}
53
54/*
55 * Add a page to a pagevec. Returns the number of slots still available.
56 */
57static inline unsigned pagevec_add(struct pagevec *pvec, struct page *page)
58{
59 pvec->pages[pvec->nr++] = page;
60 return pagevec_space(pvec);
61}
62
63
64static inline void pagevec_release(struct pagevec *pvec)
65{
66 if (pagevec_count(pvec))
67 __pagevec_release(pvec);
68}
69
70static inline void pagevec_free(struct pagevec *pvec)
71{
72 if (pagevec_count(pvec))
73 __pagevec_free(pvec);
74}
75
76static inline void __pagevec_lru_add_anon(struct pagevec *pvec)
77{
78 ____pagevec_lru_add(pvec, LRU_INACTIVE_ANON);
79}
80
81static inline void __pagevec_lru_add_active_anon(struct pagevec *pvec)
82{
83 ____pagevec_lru_add(pvec, LRU_ACTIVE_ANON);
84}
85
86static inline void __pagevec_lru_add_file(struct pagevec *pvec)
87{
88 ____pagevec_lru_add(pvec, LRU_INACTIVE_FILE);
89}
90
91static inline void __pagevec_lru_add_active_file(struct pagevec *pvec)
92{
93 ____pagevec_lru_add(pvec, LRU_ACTIVE_FILE);
94}
95
96static inline void pagevec_lru_add_file(struct pagevec *pvec)
97{
98 if (pagevec_count(pvec))
99 __pagevec_lru_add_file(pvec);
100}
101
102static inline void pagevec_lru_add_anon(struct pagevec *pvec)
103{
104 if (pagevec_count(pvec))
105 __pagevec_lru_add_anon(pvec);
106}
107
108#endif /* _LINUX_PAGEVEC_H */