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/* 14 pointers + two long's align the pagevec structure to a power of two */
13#define PAGEVEC_SIZE 14
14
15struct page;
16struct address_space;
17
18struct pagevec {
19 unsigned long nr;
20 unsigned long cold;
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_tag(struct pagevec *pvec,
42 struct address_space *mapping, pgoff_t *index, int tag,
43 unsigned nr_pages);
44
45static inline void pagevec_init(struct pagevec *pvec, int cold)
46{
47 pvec->nr = 0;
48 pvec->cold = cold;
49}
50
51static inline void pagevec_reinit(struct pagevec *pvec)
52{
53 pvec->nr = 0;
54}
55
56static inline unsigned pagevec_count(struct pagevec *pvec)
57{
58 return pvec->nr;
59}
60
61static inline unsigned pagevec_space(struct pagevec *pvec)
62{
63 return PAGEVEC_SIZE - pvec->nr;
64}
65
66/*
67 * Add a page to a pagevec. Returns the number of slots still available.
68 */
69static inline unsigned pagevec_add(struct pagevec *pvec, struct page *page)
70{
71 pvec->pages[pvec->nr++] = page;
72 return pagevec_space(pvec);
73}
74
75static inline void pagevec_release(struct pagevec *pvec)
76{
77 if (pagevec_count(pvec))
78 __pagevec_release(pvec);
79}
80
81#endif /* _LINUX_PAGEVEC_H */