projects / mirror_ubuntu-bionic-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 1da177e4 LT |
2 | /* |
| 3 | * include/linux/pagevec.h | |
| 4 | * | |
| 5 | * In many places it is efficient to batch an operation up against multiple | |
| 6 | * pages. A pagevec is a multipage container which is used for that. | |
| 7 | */ | |
| 8 | ||
| 78854014 DH |
9 | #ifndef _LINUX_PAGEVEC_H |
| 10 | #define _LINUX_PAGEVEC_H | |
| 11 | ||
| 1da177e4 LT |
12 | /* 14 pointers + two long's align the pagevec structure to a power of two */ |
| 13 | #define PAGEVEC_SIZE 14 | |
| 14 | ||
| 15 | struct page; | |
| 16 | struct address_space; | |
| 17 | ||
| 18 | struct pagevec { | |
| 19 | unsigned long nr; | |
| 7f0b5fb9 | 20 | bool percpu_pvec_drained; |
| 1da177e4 LT |
21 | struct page *pages[PAGEVEC_SIZE]; |
| 22 | }; | |
| 23 | ||
| 24 | void __pagevec_release(struct pagevec *pvec); | |
| a0b8cab3 | 25 | void __pagevec_lru_add(struct pagevec *pvec); |
| 0cd6144a JW |
26 | unsigned pagevec_lookup_entries(struct pagevec *pvec, |
| 27 | struct address_space *mapping, | |
| 28 | pgoff_t start, unsigned nr_entries, | |
| 29 | pgoff_t *indices); | |
| 30 | void pagevec_remove_exceptionals(struct pagevec *pvec); | |
| b947cee4 JK |
31 | unsigned pagevec_lookup_range(struct pagevec *pvec, |
| 32 | struct address_space *mapping, | |
| 397162ff | 33 | pgoff_t *start, pgoff_t end); |
| b947cee4 JK |
34 | static inline unsigned pagevec_lookup(struct pagevec *pvec, |
| 35 | struct address_space *mapping, | |
| 397162ff | 36 | pgoff_t *start) |
| b947cee4 | 37 | { |
| 397162ff | 38 | return pagevec_lookup_range(pvec, mapping, start, (pgoff_t)-1); |
| b947cee4 JK |
39 | } |
| 40 | ||
| 72b045ae JK |
41 | unsigned pagevec_lookup_range_tag(struct pagevec *pvec, |
| 42 | struct address_space *mapping, pgoff_t *index, pgoff_t end, | |
| 67fd707f | 43 | int tag); |
| 93d3b714 JK |
44 | unsigned pagevec_lookup_range_nr_tag(struct pagevec *pvec, |
| 45 | struct address_space *mapping, pgoff_t *index, pgoff_t end, | |
| 46 | int tag, unsigned max_pages); | |
| 72b045ae | 47 | static inline unsigned pagevec_lookup_tag(struct pagevec *pvec, |
| 67fd707f | 48 | struct address_space *mapping, pgoff_t *index, int tag) |
| 72b045ae | 49 | { |
| 67fd707f | 50 | return pagevec_lookup_range_tag(pvec, mapping, index, (pgoff_t)-1, tag); |
| 72b045ae | 51 | } |
| 1da177e4 | 52 | |
| 86679820 | 53 | static inline void pagevec_init(struct pagevec *pvec) |
| 1da177e4 LT |
54 | { |
| 55 | pvec->nr = 0; | |
| 7f0b5fb9 | 56 | pvec->percpu_pvec_drained = false; |
| 1da177e4 LT |
57 | } |
| 58 | ||
| 59 | static inline void pagevec_reinit(struct pagevec *pvec) | |
| 60 | { | |
| 61 | pvec->nr = 0; | |
| 62 | } | |
| 63 | ||
| 64 | static inline unsigned pagevec_count(struct pagevec *pvec) | |
| 65 | { | |
| 66 | return pvec->nr; | |
| 67 | } | |
| 68 | ||
| 69 | static inline unsigned pagevec_space(struct pagevec *pvec) | |
| 70 | { | |
| 71 | return PAGEVEC_SIZE - pvec->nr; | |
| 72 | } | |
| 73 | ||
| 74 | /* | |
| 75 | * Add a page to a pagevec. Returns the number of slots still available. | |
| 76 | */ | |
| 77 | static inline unsigned pagevec_add(struct pagevec *pvec, struct page *page) | |
| 78 | { | |
| 79 | pvec->pages[pvec->nr++] = page; | |
| 80 | return pagevec_space(pvec); | |
| 81 | } | |
| 82 | ||
| 1da177e4 LT |
83 | static inline void pagevec_release(struct pagevec *pvec) |
| 84 | { | |
| 85 | if (pagevec_count(pvec)) | |
| 86 | __pagevec_release(pvec); | |
| 87 | } | |
| 88 | ||
| 78854014 | 89 | #endif /* _LINUX_PAGEVEC_H */ |