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_release_nonlru(struct pagevec *pvec);
25 void __pagevec_free(struct pagevec *pvec);
26 void __pagevec_lru_add(struct pagevec *pvec);
27 void __pagevec_lru_add_active(struct pagevec *pvec);
28 void pagevec_strip(struct pagevec *pvec);
29 unsigned pagevec_lookup(struct pagevec *pvec, struct address_space *mapping,
30 pgoff_t start, unsigned nr_pages);
31 unsigned pagevec_lookup_tag(struct pagevec *pvec,
32 struct address_space *mapping, pgoff_t *index, int tag,
33 unsigned nr_pages);
34
35 static inline void pagevec_init(struct pagevec *pvec, int cold)
36 {
37 pvec->nr = 0;
38 pvec->cold = cold;
39 }
40
41 static inline void pagevec_reinit(struct pagevec *pvec)
42 {
43 pvec->nr = 0;
44 }
45
46 static inline unsigned pagevec_count(struct pagevec *pvec)
47 {
48 return pvec->nr;
49 }
50
51 static 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 */
59 static 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
66 static inline void pagevec_release(struct pagevec *pvec)
67 {
68 if (pagevec_count(pvec))
69 __pagevec_release(pvec);
70 }
71
72 static inline void pagevec_release_nonlru(struct pagevec *pvec)
73 {
74 if (pagevec_count(pvec))
75 __pagevec_release_nonlru(pvec);
76 }
77
78 static inline void pagevec_free(struct pagevec *pvec)
79 {
80 if (pagevec_count(pvec))
81 __pagevec_free(pvec);
82 }
83
84 static 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
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