projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
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 | ||
| 78854014 DH |
8 | #ifndef _LINUX_PAGEVEC_H |
| 9 | #define _LINUX_PAGEVEC_H | |
| 10 | ||
| 1da177e4 LT |
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_release_nonlru(struct pagevec *pvec); | |
| 25 | void __pagevec_free(struct pagevec *pvec); | |
| 26 | void __pagevec_lru_add(struct pagevec *pvec); | |
| 27 | void __pagevec_lru_add_active(struct pagevec *pvec); | |
| 28 | void pagevec_strip(struct pagevec *pvec); | |
| 29 | unsigned pagevec_lookup(struct pagevec *pvec, struct address_space *mapping, | |
| 30 | pgoff_t start, unsigned nr_pages); | |
| 31 | unsigned pagevec_lookup_tag(struct pagevec *pvec, | |
| 32 | struct address_space *mapping, pgoff_t *index, int tag, | |
| 33 | unsigned nr_pages); | |
| 34 | ||
| 35 | static inline void pagevec_init(struct pagevec *pvec, int cold) | |
| 36 | { | |
| 37 | pvec->nr = 0; | |
| 38 | pvec->cold = cold; | |
| 39 | } | |
| 40 | ||
| 41 | static inline void pagevec_reinit(struct pagevec *pvec) | |
| 42 | { | |
| 43 | pvec->nr = 0; | |
| 44 | } | |
| 45 | ||
| 46 | static inline unsigned pagevec_count(struct pagevec *pvec) | |
| 47 | { | |
| 48 | return pvec->nr; | |
| 49 | } | |
| 50 | ||
| 51 | static inline unsigned pagevec_space(struct pagevec *pvec) | |
| 52 | { | |
| 53 | return PAGEVEC_SIZE - pvec->nr; | |
| 54 | } | |
| 55 | ||
| 56 | /* | |
| 57 | * Add a page to a pagevec. Returns the number of slots still available. | |
| 58 | */ | |
| 59 | static inline unsigned pagevec_add(struct pagevec *pvec, struct page *page) | |
| 60 | { | |
| 61 | pvec->pages[pvec->nr++] = page; | |
| 62 | return pagevec_space(pvec); | |
| 63 | } | |
| 64 | ||
| 65 | ||
| 66 | static inline void pagevec_release(struct pagevec *pvec) | |
| 67 | { | |
| 68 | if (pagevec_count(pvec)) | |
| 69 | __pagevec_release(pvec); | |
| 70 | } | |
| 71 | ||
| 72 | static inline void pagevec_release_nonlru(struct pagevec *pvec) | |
| 73 | { | |
| 74 | if (pagevec_count(pvec)) | |
| 75 | __pagevec_release_nonlru(pvec); | |
| 76 | } | |
| 77 | ||
| 78 | static inline void pagevec_free(struct pagevec *pvec) | |
| 79 | { | |
| 80 | if (pagevec_count(pvec)) | |
| 81 | __pagevec_free(pvec); | |
| 82 | } | |
| 83 | ||
| 84 | static inline void pagevec_lru_add(struct pagevec *pvec) | |
| 85 | { | |
| 86 | if (pagevec_count(pvec)) | |
| 87 | __pagevec_lru_add(pvec); | |
| 88 | } | |
| 78854014 DH |
89 | |
| 90 | #endif /* _LINUX_PAGEVEC_H */ |