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_free(struct pagevec *pvec);
25 void ____pagevec_lru_add(struct pagevec *pvec, enum lru_list lru);
26 void pagevec_strip(struct pagevec *pvec);
27 unsigned pagevec_lookup(struct pagevec *pvec, struct address_space *mapping,
28 pgoff_t start, unsigned nr_pages);
29 unsigned pagevec_lookup_tag(struct pagevec *pvec,
30 struct address_space *mapping, pgoff_t *index, int tag,
31 unsigned nr_pages);
32
33 static inline void pagevec_init(struct pagevec *pvec, int cold)
34 {
35 pvec->nr = 0;
36 pvec->cold = cold;
37 }
38
39 static inline void pagevec_reinit(struct pagevec *pvec)
40 {
41 pvec->nr = 0;
42 }
43
44 static inline unsigned pagevec_count(struct pagevec *pvec)
45 {
46 return pvec->nr;
47 }
48
49 static 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 */
57 static 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
64 static inline void pagevec_release(struct pagevec *pvec)
65 {
66 if (pagevec_count(pvec))
67 __pagevec_release(pvec);
68 }
69
70 static inline void pagevec_free(struct pagevec *pvec)
71 {
72 if (pagevec_count(pvec))
73 __pagevec_free(pvec);
74 }
75
76 static inline void __pagevec_lru_add_anon(struct pagevec *pvec)
77 {
78 ____pagevec_lru_add(pvec, LRU_INACTIVE_ANON);
79 }
80
81 static inline void __pagevec_lru_add_active_anon(struct pagevec *pvec)
82 {
83 ____pagevec_lru_add(pvec, LRU_ACTIVE_ANON);
84 }
85
86 static inline void __pagevec_lru_add_file(struct pagevec *pvec)
87 {
88 ____pagevec_lru_add(pvec, LRU_INACTIVE_FILE);
89 }
90
91 static inline void __pagevec_lru_add_active_file(struct pagevec *pvec)
92 {
93 ____pagevec_lru_add(pvec, LRU_ACTIVE_FILE);
94 }
95
96 static inline void pagevec_lru_add_file(struct pagevec *pvec)
97 {
98 if (pagevec_count(pvec))
99 __pagevec_lru_add_file(pvec);
100 }
101
102 static 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 */
109
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