| 1 | /* |
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| 2 | * include/linux/pagevec.h |
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| 3 | * |
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| 4 | * In many places it is efficient to batch an operation up against multiple |
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| 5 | * pages. A pagevec is a multipage container which is used for that. |
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| 6 | */ |
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| 7 | |
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| 8 | /* 14 pointers + two long's align the pagevec structure to a power of two */ |
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| 9 | #define PAGEVEC_SIZE 14 |
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| 10 | |
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| 11 | struct page; |
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| 12 | struct address_space; |
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| 13 | |
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| 14 | struct pagevec { |
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| 15 | unsigned long nr; |
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| 16 | unsigned long cold; |
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| 17 | struct page *pages[PAGEVEC_SIZE]; |
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| 18 | }; |
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| 19 | |
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| 20 | void __pagevec_release(struct pagevec *pvec); |
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| 21 | void __pagevec_release_nonlru(struct pagevec *pvec); |
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| 22 | void __pagevec_free(struct pagevec *pvec); |
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| 23 | void __pagevec_lru_add(struct pagevec *pvec); |
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| 24 | void __pagevec_lru_add_active(struct pagevec *pvec); |
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| 25 | void pagevec_strip(struct pagevec *pvec); |
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| 26 | unsigned pagevec_lookup(struct pagevec *pvec, struct address_space *mapping, |
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| 27 | pgoff_t start, unsigned nr_pages); |
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| 28 | unsigned pagevec_lookup_tag(struct pagevec *pvec, |
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| 29 | struct address_space *mapping, pgoff_t *index, int tag, |
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| 30 | unsigned nr_pages); |
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| 31 | |
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| 32 | static inline void pagevec_init(struct pagevec *pvec, int cold) |
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| 33 | { |
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| 34 | pvec->nr = 0; |
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| 35 | pvec->cold = cold; |
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| 36 | } |
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| 37 | |
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| 38 | static inline void pagevec_reinit(struct pagevec *pvec) |
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| 39 | { |
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| 40 | pvec->nr = 0; |
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| 41 | } |
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| 42 | |
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| 43 | static inline unsigned pagevec_count(struct pagevec *pvec) |
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| 44 | { |
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| 45 | return pvec->nr; |
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| 46 | } |
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| 47 | |
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| 48 | static inline unsigned pagevec_space(struct pagevec *pvec) |
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| 49 | { |
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| 50 | return PAGEVEC_SIZE - pvec->nr; |
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| 51 | } |
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| 52 | |
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| 53 | /* |
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| 54 | * Add a page to a pagevec. Returns the number of slots still available. |
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| 55 | */ |
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| 56 | static inline unsigned pagevec_add(struct pagevec *pvec, struct page *page) |
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| 57 | { |
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| 58 | pvec->pages[pvec->nr++] = page; |
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| 59 | return pagevec_space(pvec); |
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| 60 | } |
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| 61 | |
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| 62 | |
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| 63 | static inline void pagevec_release(struct pagevec *pvec) |
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| 64 | { |
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| 65 | if (pagevec_count(pvec)) |
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| 66 | __pagevec_release(pvec); |
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| 67 | } |
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| 68 | |
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| 69 | static inline void pagevec_release_nonlru(struct pagevec *pvec) |
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| 70 | { |
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| 71 | if (pagevec_count(pvec)) |
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| 72 | __pagevec_release_nonlru(pvec); |
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| 73 | } |
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| 74 | |
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| 75 | static inline void pagevec_free(struct pagevec *pvec) |
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| 76 | { |
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| 77 | if (pagevec_count(pvec)) |
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| 78 | __pagevec_free(pvec); |
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| 79 | } |
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| 80 | |
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| 81 | static inline void pagevec_lru_add(struct pagevec *pvec) |
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| 82 | { |
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| 83 | if (pagevec_count(pvec)) |
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| 84 | __pagevec_lru_add(pvec); |
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| 85 | } |
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