Linux kernel mirror (for testing)
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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/* 15 pointers + header align the pagevec structure to a power of two */
13#define PAGEVEC_SIZE 15
14
15struct page;
16struct address_space;
17
18struct pagevec {
19 unsigned char nr;
20 bool percpu_pvec_drained;
21 struct page *pages[PAGEVEC_SIZE];
22};
23
24void __pagevec_release(struct pagevec *pvec);
25void __pagevec_lru_add(struct pagevec *pvec);
26unsigned pagevec_lookup_entries(struct pagevec *pvec,
27 struct address_space *mapping,
28 pgoff_t start, unsigned nr_entries,
29 pgoff_t *indices);
30void pagevec_remove_exceptionals(struct pagevec *pvec);
31unsigned pagevec_lookup_range(struct pagevec *pvec,
32 struct address_space *mapping,
33 pgoff_t *start, pgoff_t end);
34static 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
41unsigned pagevec_lookup_range_tag(struct pagevec *pvec,
42 struct address_space *mapping, pgoff_t *index, pgoff_t end,
43 int tag);
44unsigned 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);
47static 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
53static inline void pagevec_init(struct pagevec *pvec)
54{
55 pvec->nr = 0;
56 pvec->percpu_pvec_drained = false;
57}
58
59static inline void pagevec_reinit(struct pagevec *pvec)
60{
61 pvec->nr = 0;
62}
63
64static inline unsigned pagevec_count(struct pagevec *pvec)
65{
66 return pvec->nr;
67}
68
69static 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 */
77static inline unsigned pagevec_add(struct pagevec *pvec, struct page *page)
78{
79 pvec->pages[pvec->nr++] = page;
80 return pagevec_space(pvec);
81}
82
83static inline void pagevec_release(struct pagevec *pvec)
84{
85 if (pagevec_count(pvec))
86 __pagevec_release(pvec);
87}
88
89#endif /* _LINUX_PAGEVEC_H */