| 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 |
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| 8 | #ifndef _LINUX_PAGEVEC_H
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| 9 | #define _LINUX_PAGEVEC_H
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| 10 |
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| 11 |
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| 12 | #define PAGEVEC_SIZE 14
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| 13 |
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| 14 | struct page;
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| 15 | struct address_space;
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| 16 |
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| 17 | struct pagevec {
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| 18 | unsigned long nr;
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| 19 | unsigned long cold;
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| 20 | struct page *pages[PAGEVEC_SIZE];
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| 21 | };
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| 22 |
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| 23 | void __pagevec_release(struct pagevec *pvec);
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| 24 | void __pagevec_lru_add(struct pagevec *pvec);
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| 25 | unsigned pagevec_lookup_entries(struct pagevec *pvec,
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| 26 | struct address_space *mapping,
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| 27 | pgoff_t start, unsigned nr_entries,
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| 28 | pgoff_t *indices);
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| 29 | void pagevec_remove_exceptionals(struct pagevec *pvec);
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| 30 | unsigned pagevec_lookup(struct pagevec *pvec, struct address_space *mapping,
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| 31 | pgoff_t start, unsigned nr_pages);
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| 32 | unsigned pagevec_lookup_tag(struct pagevec *pvec,
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| 33 | struct address_space *mapping, pgoff_t *index, int tag,
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| 34 | unsigned nr_pages);
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| 35 |
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| 36 | static inline void pagevec_init(struct pagevec *pvec, int cold)
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| 37 | {
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| 38 | pvec->nr = 0;
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| 39 | pvec->cold = cold;
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| 40 | }
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| 41 |
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| 42 | static inline void pagevec_reinit(struct pagevec *pvec)
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| 43 | {
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| 44 | pvec->nr = 0;
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| 45 | }
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| 46 |
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| 47 | static inline unsigned pagevec_count(struct pagevec *pvec)
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| 48 | {
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| 49 | return pvec->nr;
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| 50 | }
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| 51 |
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| 52 | static inline unsigned pagevec_space(struct pagevec *pvec)
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| 53 | {
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| 54 | return PAGEVEC_SIZE - pvec->nr;
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| 55 | }
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| 56 |
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| 57 | |
| 58 | * Add a page to a pagevec. Returns the number of slots still available.
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| 59 |
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| 60 | static inline unsigned pagevec_add(struct pagevec *pvec, struct page *page)
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| 61 | {
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| 62 | pvec->pages[pvec->nr++] = page;
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| 63 | return pagevec_space(pvec);
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| 64 | }
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| 65 |
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| 66 | static inline void pagevec_release(struct pagevec *pvec)
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| 67 | {
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| 68 | if (pagevec_count(pvec))
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| 69 | __pagevec_release(pvec);
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| 70 | }
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| 71 |
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| 72 | #endif
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