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1 | /* SPDX-License-Identifier: GPL-2.0 */ | |
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 | ||
9 | #ifndef _LINUX_PAGEVEC_H | |
10 | #define _LINUX_PAGEVEC_H | |
11 | ||
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; | |
20 | bool percpu_pvec_drained; | |
21 | struct page *pages[PAGEVEC_SIZE]; | |
22 | }; | |
23 | ||
24 | void __pagevec_release(struct pagevec *pvec); | |
25 | void __pagevec_lru_add(struct pagevec *pvec); | |
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); | |
31 | unsigned pagevec_lookup_range(struct pagevec *pvec, | |
32 | struct address_space *mapping, | |
33 | pgoff_t *start, pgoff_t end); | |
34 | static inline unsigned pagevec_lookup(struct pagevec *pvec, | |
35 | struct address_space *mapping, | |
36 | pgoff_t *start) | |
37 | { | |
38 | return pagevec_lookup_range(pvec, mapping, start, (pgoff_t)-1); | |
39 | } | |
40 | ||
41 | unsigned pagevec_lookup_range_tag(struct pagevec *pvec, | |
42 | struct address_space *mapping, pgoff_t *index, pgoff_t end, | |
43 | int tag); | |
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); | |
47 | static inline unsigned pagevec_lookup_tag(struct pagevec *pvec, | |
48 | struct address_space *mapping, pgoff_t *index, int tag) | |
49 | { | |
50 | return pagevec_lookup_range_tag(pvec, mapping, index, (pgoff_t)-1, tag); | |
51 | } | |
52 | ||
53 | static inline void pagevec_init(struct pagevec *pvec) | |
54 | { | |
55 | pvec->nr = 0; | |
56 | pvec->percpu_pvec_drained = false; | |
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 | ||
83 | static inline void pagevec_release(struct pagevec *pvec) | |
84 | { | |
85 | if (pagevec_count(pvec)) | |
86 | __pagevec_release(pvec); | |
87 | } | |
88 | ||
89 | #endif /* _LINUX_PAGEVEC_H */ |