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_free(struct pagevec *pvec);
25 void ____pagevec_lru_add(struct pagevec *pvec, enum lru_list lru);
26 void pagevec_strip(struct pagevec *pvec);
27 void pagevec_swap_free(struct pagevec *pvec);
28 unsigned pagevec_lookup(struct pagevec *pvec, struct address_space *mapping,
29 pgoff_t start, unsigned nr_pages);
30 unsigned pagevec_lookup_tag(struct pagevec *pvec,
31 struct address_space *mapping, pgoff_t *index, int tag,
32 unsigned nr_pages);
33
pagevec_init(struct pagevec * pvec,int cold)34 static inline void pagevec_init(struct pagevec *pvec, int cold)
35 {
36 pvec->nr = 0;
37 pvec->cold = cold;
38 }
39
pagevec_reinit(struct pagevec * pvec)40 static inline void pagevec_reinit(struct pagevec *pvec)
41 {
42 pvec->nr = 0;
43 }
44
pagevec_count(struct pagevec * pvec)45 static inline unsigned pagevec_count(struct pagevec *pvec)
46 {
47 return pvec->nr;
48 }
49
pagevec_space(struct pagevec * pvec)50 static inline unsigned pagevec_space(struct pagevec *pvec)
51 {
52 return PAGEVEC_SIZE - pvec->nr;
53 }
54
55 /*
56 * Add a page to a pagevec. Returns the number of slots still available.
57 */
pagevec_add(struct pagevec * pvec,struct page * page)58 static inline unsigned pagevec_add(struct pagevec *pvec, struct page *page)
59 {
60 pvec->pages[pvec->nr++] = page;
61 return pagevec_space(pvec);
62 }
63
64
pagevec_release(struct pagevec * pvec)65 static inline void pagevec_release(struct pagevec *pvec)
66 {
67 if (pagevec_count(pvec))
68 __pagevec_release(pvec);
69 }
70
pagevec_free(struct pagevec * pvec)71 static inline void pagevec_free(struct pagevec *pvec)
72 {
73 if (pagevec_count(pvec))
74 __pagevec_free(pvec);
75 }
76
__pagevec_lru_add_anon(struct pagevec * pvec)77 static inline void __pagevec_lru_add_anon(struct pagevec *pvec)
78 {
79 ____pagevec_lru_add(pvec, LRU_INACTIVE_ANON);
80 }
81
__pagevec_lru_add_active_anon(struct pagevec * pvec)82 static inline void __pagevec_lru_add_active_anon(struct pagevec *pvec)
83 {
84 ____pagevec_lru_add(pvec, LRU_ACTIVE_ANON);
85 }
86
__pagevec_lru_add_file(struct pagevec * pvec)87 static inline void __pagevec_lru_add_file(struct pagevec *pvec)
88 {
89 ____pagevec_lru_add(pvec, LRU_INACTIVE_FILE);
90 }
91
__pagevec_lru_add_active_file(struct pagevec * pvec)92 static inline void __pagevec_lru_add_active_file(struct pagevec *pvec)
93 {
94 ____pagevec_lru_add(pvec, LRU_ACTIVE_FILE);
95 }
96
pagevec_lru_add_file(struct pagevec * pvec)97 static inline void pagevec_lru_add_file(struct pagevec *pvec)
98 {
99 if (pagevec_count(pvec))
100 __pagevec_lru_add_file(pvec);
101 }
102
pagevec_lru_add_anon(struct pagevec * pvec)103 static inline void pagevec_lru_add_anon(struct pagevec *pvec)
104 {
105 if (pagevec_count(pvec))
106 __pagevec_lru_add_anon(pvec);
107 }
108
109 #endif /* _LINUX_PAGEVEC_H */
110