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Commit | Line | Data |
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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 */ |