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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * include/linux/pagevec.h
3 *
4 * In many places it is efficient to batch an operation up against multiple
5 * pages. A pagevec is a multipage container which is used for that.
6 */
7
David Howells78854012006-01-08 01:02:37 -08008#ifndef _LINUX_PAGEVEC_H
9#define _LINUX_PAGEVEC_H
10
Linus Torvalds1da177e2005-04-16 15:20:36 -070011/* 14 pointers + two long's align the pagevec structure to a power of two */
12#define PAGEVEC_SIZE 14
13
14struct page;
15struct address_space;
16
17struct pagevec {
18 unsigned long nr;
19 unsigned long cold;
20 struct page *pages[PAGEVEC_SIZE];
21};
22
23void __pagevec_release(struct pagevec *pvec);
24void __pagevec_release_nonlru(struct pagevec *pvec);
25void __pagevec_free(struct pagevec *pvec);
KOSAKI Motohirof04e9eb2008-10-18 20:26:19 -070026void ____pagevec_lru_add(struct pagevec *pvec, enum lru_list lru);
Linus Torvalds1da177e2005-04-16 15:20:36 -070027void pagevec_strip(struct pagevec *pvec);
Rik van Riel68a223942008-10-18 20:26:23 -070028void pagevec_swap_free(struct pagevec *pvec);
Linus Torvalds1da177e2005-04-16 15:20:36 -070029unsigned pagevec_lookup(struct pagevec *pvec, struct address_space *mapping,
30 pgoff_t start, unsigned nr_pages);
31unsigned pagevec_lookup_tag(struct pagevec *pvec,
32 struct address_space *mapping, pgoff_t *index, int tag,
33 unsigned nr_pages);
34
35static inline void pagevec_init(struct pagevec *pvec, int cold)
36{
37 pvec->nr = 0;
38 pvec->cold = cold;
39}
40
41static inline void pagevec_reinit(struct pagevec *pvec)
42{
43 pvec->nr = 0;
44}
45
46static inline unsigned pagevec_count(struct pagevec *pvec)
47{
48 return pvec->nr;
49}
50
51static inline unsigned pagevec_space(struct pagevec *pvec)
52{
53 return PAGEVEC_SIZE - pvec->nr;
54}
55
56/*
57 * Add a page to a pagevec. Returns the number of slots still available.
58 */
59static inline unsigned pagevec_add(struct pagevec *pvec, struct page *page)
60{
61 pvec->pages[pvec->nr++] = page;
62 return pagevec_space(pvec);
63}
64
65
66static inline void pagevec_release(struct pagevec *pvec)
67{
68 if (pagevec_count(pvec))
69 __pagevec_release(pvec);
70}
71
72static inline void pagevec_release_nonlru(struct pagevec *pvec)
73{
74 if (pagevec_count(pvec))
75 __pagevec_release_nonlru(pvec);
76}
77
78static inline void pagevec_free(struct pagevec *pvec)
79{
80 if (pagevec_count(pvec))
81 __pagevec_free(pvec);
82}
83
Rik van Riel4f98a2f2008-10-18 20:26:32 -070084static inline void __pagevec_lru_add_anon(struct pagevec *pvec)
KOSAKI Motohirof04e9eb2008-10-18 20:26:19 -070085{
Rik van Riel4f98a2f2008-10-18 20:26:32 -070086 ____pagevec_lru_add(pvec, LRU_INACTIVE_ANON);
KOSAKI Motohirof04e9eb2008-10-18 20:26:19 -070087}
88
Rik van Riel4f98a2f2008-10-18 20:26:32 -070089static inline void __pagevec_lru_add_active_anon(struct pagevec *pvec)
KOSAKI Motohirof04e9eb2008-10-18 20:26:19 -070090{
Rik van Riel4f98a2f2008-10-18 20:26:32 -070091 ____pagevec_lru_add(pvec, LRU_ACTIVE_ANON);
KOSAKI Motohirof04e9eb2008-10-18 20:26:19 -070092}
93
Rik van Riel4f98a2f2008-10-18 20:26:32 -070094static inline void __pagevec_lru_add_file(struct pagevec *pvec)
95{
96 ____pagevec_lru_add(pvec, LRU_INACTIVE_FILE);
97}
98
99static inline void __pagevec_lru_add_active_file(struct pagevec *pvec)
100{
101 ____pagevec_lru_add(pvec, LRU_ACTIVE_FILE);
102}
103
Rik van Riel4f98a2f2008-10-18 20:26:32 -0700104static inline void pagevec_lru_add_file(struct pagevec *pvec)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105{
106 if (pagevec_count(pvec))
Rik van Riel4f98a2f2008-10-18 20:26:32 -0700107 __pagevec_lru_add_file(pvec);
108}
109
110static inline void pagevec_lru_add_anon(struct pagevec *pvec)
111{
112 if (pagevec_count(pvec))
113 __pagevec_lru_add_anon(pvec);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114}
David Howells78854012006-01-08 01:02:37 -0800115
116#endif /* _LINUX_PAGEVEC_H */