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1da177e4 LT |
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 | ||
78854014 DH |
8 | #ifndef _LINUX_PAGEVEC_H |
9 | #define _LINUX_PAGEVEC_H | |
10 | ||
1da177e4 LT |
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 | } | |
78854014 DH |
89 | |
90 | #endif /* _LINUX_PAGEVEC_H */ |