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#include <linux/xarray.h>
13
14/* 15 pointers + header align the pagevec structure to a power of two */
15#define PAGEVEC_SIZE 15
16
17struct page;
18struct address_space;
19
20struct pagevec {
21 unsigned char nr;
22 bool percpu_pvec_drained;
23 struct page *pages[PAGEVEC_SIZE];
24};
25
26void __pagevec_release(struct pagevec *pvec);
27void __pagevec_lru_add(struct pagevec *pvec);
28void pagevec_remove_exceptionals(struct pagevec *pvec);
29unsigned pagevec_lookup_range(struct pagevec *pvec,
30 struct address_space *mapping,
31 pgoff_t *start, pgoff_t end);
32static inline unsigned pagevec_lookup(struct pagevec *pvec,
33 struct address_space *mapping,
34 pgoff_t *start)
35{
36 return pagevec_lookup_range(pvec, mapping, start, (pgoff_t)-1);
37}
38
39unsigned pagevec_lookup_range_tag(struct pagevec *pvec,
40 struct address_space *mapping, pgoff_t *index, pgoff_t end,
41 xa_mark_t tag);
42static inline unsigned pagevec_lookup_tag(struct pagevec *pvec,
43 struct address_space *mapping, pgoff_t *index, xa_mark_t tag)
44{
45 return pagevec_lookup_range_tag(pvec, mapping, index, (pgoff_t)-1, tag);
46}
47
48static inline void pagevec_init(struct pagevec *pvec)
49{
50 pvec->nr = 0;
51 pvec->percpu_pvec_drained = false;
52}
53
54static inline void pagevec_reinit(struct pagevec *pvec)
55{
56 pvec->nr = 0;
57}
58
59static inline unsigned pagevec_count(struct pagevec *pvec)
60{
61 return pvec->nr;
62}
63
64static inline unsigned pagevec_space(struct pagevec *pvec)
65{
66 return PAGEVEC_SIZE - pvec->nr;
67}
68
69/*
70 * Add a page to a pagevec. Returns the number of slots still available.
71 */
72static inline unsigned pagevec_add(struct pagevec *pvec, struct page *page)
73{
74 pvec->pages[pvec->nr++] = page;
75 return pagevec_space(pvec);
76}
77
78static inline void pagevec_release(struct pagevec *pvec)
79{
80 if (pagevec_count(pvec))
81 __pagevec_release(pvec);
82}
83
84#endif /* _LINUX_PAGEVEC_H */