1/*
 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
 8#ifndef _LINUX_PAGEVEC_H
 9#define _LINUX_PAGEVEC_H
10
11/* 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_lru_add(struct pagevec *pvec, enum lru_list lru);
25unsigned pagevec_lookup(struct pagevec *pvec, struct address_space *mapping,
26		pgoff_t start, unsigned nr_pages);
27unsigned pagevec_lookup_tag(struct pagevec *pvec,
28		struct address_space *mapping, pgoff_t *index, int tag,
29		unsigned nr_pages);
30
31static inline void pagevec_init(struct pagevec *pvec, int cold)
32{
33	pvec->nr = 0;
34	pvec->cold = cold;
35}
36
37static inline void pagevec_reinit(struct pagevec *pvec)
38{
39	pvec->nr = 0;
40}
41
42static inline unsigned pagevec_count(struct pagevec *pvec)
43{
44	return pvec->nr;
45}
46
47static inline unsigned pagevec_space(struct pagevec *pvec)
48{
49	return PAGEVEC_SIZE - pvec->nr;
50}
51
52/*
53 * Add a page to a pagevec.  Returns the number of slots still available.
54 */
55static inline unsigned pagevec_add(struct pagevec *pvec, struct page *page)
56{
57	pvec->pages[pvec->nr++] = page;
58	return pagevec_space(pvec);
59}
60
61static inline void pagevec_release(struct pagevec *pvec)
62{
63	if (pagevec_count(pvec))
64		__pagevec_release(pvec);
65}
66
67static inline void __pagevec_lru_add_anon(struct pagevec *pvec)
68{
69	__pagevec_lru_add(pvec, LRU_INACTIVE_ANON);
70}
71
72static inline void __pagevec_lru_add_active_anon(struct pagevec *pvec)
73{
74	__pagevec_lru_add(pvec, LRU_ACTIVE_ANON);
75}
76
77static inline void __pagevec_lru_add_file(struct pagevec *pvec)
78{
79	__pagevec_lru_add(pvec, LRU_INACTIVE_FILE);
80}
81
82static inline void __pagevec_lru_add_active_file(struct pagevec *pvec)
83{
84	__pagevec_lru_add(pvec, LRU_ACTIVE_FILE);
85}
86
87static inline void pagevec_lru_add_file(struct pagevec *pvec)
88{
89	if (pagevec_count(pvec))
90		__pagevec_lru_add_file(pvec);
91}
92
93static inline void pagevec_lru_add_anon(struct pagevec *pvec)
94{
95	if (pagevec_count(pvec))
96		__pagevec_lru_add_anon(pvec);
97}
98
99#endif /* _LINUX_PAGEVEC_H */