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
17 struct page;
18 struct address_space;
19
20 struct pagevec {
21 unsigned char nr;
22 bool percpu_pvec_drained;
23 struct page *pages[PAGEVEC_SIZE];
24 };
25
26 void __pagevec_release(struct pagevec *pvec);
27 void __pagevec_lru_add(struct pagevec *pvec);
28 void pagevec_remove_exceptionals(struct pagevec *pvec);
29 unsigned pagevec_lookup_range(struct pagevec *pvec,
30 struct address_space *mapping,
31 pgoff_t *start, pgoff_t end);
pagevec_lookup(struct pagevec * pvec,struct address_space * mapping,pgoff_t * start)32 static 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
39 unsigned pagevec_lookup_range_tag(struct pagevec *pvec,
40 struct address_space *mapping, pgoff_t *index, pgoff_t end,
41 xa_mark_t tag);
pagevec_lookup_tag(struct pagevec * pvec,struct address_space * mapping,pgoff_t * index,xa_mark_t tag)42 static 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
pagevec_init(struct pagevec * pvec)48 static inline void pagevec_init(struct pagevec *pvec)
49 {
50 pvec->nr = 0;
51 pvec->percpu_pvec_drained = false;
52 }
53
pagevec_reinit(struct pagevec * pvec)54 static inline void pagevec_reinit(struct pagevec *pvec)
55 {
56 pvec->nr = 0;
57 }
58
pagevec_count(struct pagevec * pvec)59 static inline unsigned pagevec_count(struct pagevec *pvec)
60 {
61 return pvec->nr;
62 }
63
pagevec_space(struct pagevec * pvec)64 static 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 */
pagevec_add(struct pagevec * pvec,struct page * page)72 static inline unsigned pagevec_add(struct pagevec *pvec, struct page *page)
73 {
74 pvec->pages[pvec->nr++] = page;
75 return pagevec_space(pvec);
76 }
77
pagevec_release(struct pagevec * pvec)78 static inline void pagevec_release(struct pagevec *pvec)
79 {
80 if (pagevec_count(pvec))
81 __pagevec_release(pvec);
82 }
83
84 #endif /* _LINUX_PAGEVEC_H */
85