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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 422 | giacomo | 1 | /* |
| 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 | |||
| 8 | #define PAGEVEC_SIZE 16 |
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| 9 | |||
| 10 | struct page; |
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| 11 | struct address_space; |
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| 12 | |||
| 13 | struct pagevec { |
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| 14 | unsigned nr; |
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| 15 | int cold; |
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| 16 | struct page *pages[PAGEVEC_SIZE]; |
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| 17 | }; |
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| 18 | |||
| 19 | void __pagevec_release(struct pagevec *pvec); |
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| 20 | void __pagevec_release_nonlru(struct pagevec *pvec); |
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| 21 | void __pagevec_free(struct pagevec *pvec); |
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| 22 | void __pagevec_lru_add(struct pagevec *pvec); |
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| 23 | void __pagevec_lru_add_active(struct pagevec *pvec); |
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| 24 | void pagevec_strip(struct pagevec *pvec); |
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| 25 | unsigned int pagevec_lookup(struct pagevec *pvec, struct address_space *mapping, |
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| 26 | pgoff_t start, unsigned int nr_pages); |
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| 27 | |||
| 28 | static inline void pagevec_init(struct pagevec *pvec, int cold) |
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| 29 | { |
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| 30 | pvec->nr = 0; |
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| 31 | pvec->cold = cold; |
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| 32 | } |
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| 33 | |||
| 34 | static inline void pagevec_reinit(struct pagevec *pvec) |
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| 35 | { |
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| 36 | pvec->nr = 0; |
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| 37 | } |
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| 38 | |||
| 39 | static inline unsigned pagevec_count(struct pagevec *pvec) |
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| 40 | { |
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| 41 | return pvec->nr; |
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| 42 | } |
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| 43 | |||
| 44 | static inline unsigned pagevec_space(struct pagevec *pvec) |
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| 45 | { |
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| 46 | return PAGEVEC_SIZE - pvec->nr; |
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| 47 | } |
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| 48 | |||
| 49 | /* |
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| 50 | * Add a page to a pagevec. Returns the number of slots still available. |
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| 51 | */ |
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| 52 | static inline unsigned pagevec_add(struct pagevec *pvec, struct page *page) |
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| 53 | { |
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| 54 | pvec->pages[pvec->nr++] = page; |
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| 55 | return pagevec_space(pvec); |
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| 56 | } |
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| 57 | |||
| 58 | |||
| 59 | static inline void pagevec_release(struct pagevec *pvec) |
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| 60 | { |
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| 61 | if (pagevec_count(pvec)) |
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| 62 | __pagevec_release(pvec); |
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| 63 | } |
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| 64 | |||
| 65 | static inline void pagevec_release_nonlru(struct pagevec *pvec) |
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| 66 | { |
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| 67 | if (pagevec_count(pvec)) |
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| 68 | __pagevec_release_nonlru(pvec); |
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| 69 | } |
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| 70 | |||
| 71 | static inline void pagevec_free(struct pagevec *pvec) |
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| 72 | { |
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| 73 | if (pagevec_count(pvec)) |
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| 74 | __pagevec_free(pvec); |
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| 75 | } |
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| 76 | |||
| 77 | static inline void pagevec_lru_add(struct pagevec *pvec) |
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| 78 | { |
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| 79 | if (pagevec_count(pvec)) |
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| 80 | __pagevec_lru_add(pvec); |
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| 81 | } |