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
14 struct page;
15 struct address_space;
16
17 struct pagevec {
18 unsigned long nr;
19 unsigned long cold;
20 struct page *pages[PAGEVEC_SIZE];
21 };
22
23 void __pagevec_release(struct pagevec *pvec);
24 void __pagevec_lru_add(struct pagevec *pvec, enum lru_list lru);
25 unsigned pagevec_lookup(struct pagevec *pvec, struct address_space *mapping,
26 pgoff_t start, unsigned nr_pages);
27 unsigned pagevec_lookup_tag(struct pagevec *pvec,
28 struct address_space *mapping, pgoff_t *index, int tag,
29 unsigned nr_pages);
30
pagevec_init(struct pagevec * pvec,int cold)31 static inline void pagevec_init(struct pagevec *pvec, int cold)
32 {
33 pvec->nr = 0;
34 pvec->cold = cold;
35 }
36
pagevec_reinit(struct pagevec * pvec)37 static inline void pagevec_reinit(struct pagevec *pvec)
38 {
39 pvec->nr = 0;
40 }
41
pagevec_count(struct pagevec * pvec)42 static inline unsigned pagevec_count(struct pagevec *pvec)
43 {
44 return pvec->nr;
45 }
46
pagevec_space(struct pagevec * pvec)47 static 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 */
pagevec_add(struct pagevec * pvec,struct page * page)55 static inline unsigned pagevec_add(struct pagevec *pvec, struct page *page)
56 {
57 pvec->pages[pvec->nr++] = page;
58 return pagevec_space(pvec);
59 }
60
pagevec_release(struct pagevec * pvec)61 static inline void pagevec_release(struct pagevec *pvec)
62 {
63 if (pagevec_count(pvec))
64 __pagevec_release(pvec);
65 }
66
__pagevec_lru_add_anon(struct pagevec * pvec)67 static inline void __pagevec_lru_add_anon(struct pagevec *pvec)
68 {
69 __pagevec_lru_add(pvec, LRU_INACTIVE_ANON);
70 }
71
__pagevec_lru_add_active_anon(struct pagevec * pvec)72 static inline void __pagevec_lru_add_active_anon(struct pagevec *pvec)
73 {
74 __pagevec_lru_add(pvec, LRU_ACTIVE_ANON);
75 }
76
__pagevec_lru_add_file(struct pagevec * pvec)77 static inline void __pagevec_lru_add_file(struct pagevec *pvec)
78 {
79 __pagevec_lru_add(pvec, LRU_INACTIVE_FILE);
80 }
81
__pagevec_lru_add_active_file(struct pagevec * pvec)82 static inline void __pagevec_lru_add_active_file(struct pagevec *pvec)
83 {
84 __pagevec_lru_add(pvec, LRU_ACTIVE_FILE);
85 }
86
pagevec_lru_add_file(struct pagevec * pvec)87 static inline void pagevec_lru_add_file(struct pagevec *pvec)
88 {
89 if (pagevec_count(pvec))
90 __pagevec_lru_add_file(pvec);
91 }
92
pagevec_lru_add_anon(struct pagevec * pvec)93 static 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 */
100