| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 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 | /* 14 pointers + two long's align the pagevec structure to a power of two */ |
| 9 | #define PAGEVEC_SIZE 14 |
| 10 | |
| 11 | struct page; |
| 12 | struct address_space; |
| 13 | |
| 14 | struct pagevec { |
| 15 | unsigned long nr; |
| 16 | unsigned long cold; |
| 17 | struct page *pages[PAGEVEC_SIZE]; |
| 18 | }; |
| 19 | |
| 20 | void __pagevec_release(struct pagevec *pvec); |
| 21 | void __pagevec_release_nonlru(struct pagevec *pvec); |
| 22 | void __pagevec_free(struct pagevec *pvec); |
| 23 | void __pagevec_lru_add(struct pagevec *pvec); |
| 24 | void __pagevec_lru_add_active(struct pagevec *pvec); |
| 25 | void pagevec_strip(struct pagevec *pvec); |
| 26 | unsigned pagevec_lookup(struct pagevec *pvec, struct address_space *mapping, |
| 27 | pgoff_t start, unsigned nr_pages); |
| 28 | unsigned pagevec_lookup_tag(struct pagevec *pvec, |
| 29 | struct address_space *mapping, pgoff_t *index, int tag, |
| 30 | unsigned nr_pages); |
| 31 | |
| 32 | static inline void pagevec_init(struct pagevec *pvec, int cold) |
| 33 | { |
| 34 | pvec->nr = 0; |
| 35 | pvec->cold = cold; |
| 36 | } |
| 37 | |
| 38 | static inline void pagevec_reinit(struct pagevec *pvec) |
| 39 | { |
| 40 | pvec->nr = 0; |
| 41 | } |
| 42 | |
| 43 | static inline unsigned pagevec_count(struct pagevec *pvec) |
| 44 | { |
| 45 | return pvec->nr; |
| 46 | } |
| 47 | |
| 48 | static inline unsigned pagevec_space(struct pagevec *pvec) |
| 49 | { |
| 50 | return PAGEVEC_SIZE - pvec->nr; |
| 51 | } |
| 52 | |
| 53 | /* |
| 54 | * Add a page to a pagevec. Returns the number of slots still available. |
| 55 | */ |
| 56 | static inline unsigned pagevec_add(struct pagevec *pvec, struct page *page) |
| 57 | { |
| 58 | pvec->pages[pvec->nr++] = page; |
| 59 | return pagevec_space(pvec); |
| 60 | } |
| 61 | |
| 62 | |
| 63 | static inline void pagevec_release(struct pagevec *pvec) |
| 64 | { |
| 65 | if (pagevec_count(pvec)) |
| 66 | __pagevec_release(pvec); |
| 67 | } |
| 68 | |
| 69 | static inline void pagevec_release_nonlru(struct pagevec *pvec) |
| 70 | { |
| 71 | if (pagevec_count(pvec)) |
| 72 | __pagevec_release_nonlru(pvec); |
| 73 | } |
| 74 | |
| 75 | static inline void pagevec_free(struct pagevec *pvec) |
| 76 | { |
| 77 | if (pagevec_count(pvec)) |
| 78 | __pagevec_free(pvec); |
| 79 | } |
| 80 | |
| 81 | static inline void pagevec_lru_add(struct pagevec *pvec) |
| 82 | { |
| 83 | if (pagevec_count(pvec)) |
| 84 | __pagevec_lru_add(pvec); |
| 85 | } |