xref: /linux-6.15/include/linux/pagevec.h (revision 4bedea94) 
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 /* 14 pointers + two long's align the pagevec structure to a power of two */
9 #define PAGEVEC_SIZE	14
10 
11 struct page;
12 struct address_space;
13 
14 struct pagevec {
15 	unsigned long nr;
16 	unsigned long cold;
17 	struct page *pages[PAGEVEC_SIZE];
18 };
19 
20 void __pagevec_release(struct pagevec *pvec);
21 void __pagevec_release_nonlru(struct pagevec *pvec);
22 void __pagevec_free(struct pagevec *pvec);
23 void __pagevec_lru_add(struct pagevec *pvec);
24 void __pagevec_lru_add_active(struct pagevec *pvec);
25 void pagevec_strip(struct pagevec *pvec);
26 unsigned pagevec_lookup(struct pagevec *pvec, struct address_space *mapping,
27 		pgoff_t start, unsigned nr_pages);
28 unsigned pagevec_lookup_tag(struct pagevec *pvec,
29 		struct address_space *mapping, pgoff_t *index, int tag,
30 		unsigned nr_pages);
31 
32 static inline void pagevec_init(struct pagevec *pvec, int cold)
33 {
34 	pvec->nr = 0;
35 	pvec->cold = cold;
36 }
37 
38 static inline void pagevec_reinit(struct pagevec *pvec)
39 {
40 	pvec->nr = 0;
41 }
42 
43 static inline unsigned pagevec_count(struct pagevec *pvec)
44 {
45 	return pvec->nr;
46 }
47 
48 static inline unsigned pagevec_space(struct pagevec *pvec)
49 {
50 	return PAGEVEC_SIZE - pvec->nr;
51 }
52 
53 /*
54  * Add a page to a pagevec.  Returns the number of slots still available.
55  */
56 static inline unsigned pagevec_add(struct pagevec *pvec, struct page *page)
57 {
58 	pvec->pages[pvec->nr++] = page;
59 	return pagevec_space(pvec);
60 }
61 
62 
63 static inline void pagevec_release(struct pagevec *pvec)
64 {
65 	if (pagevec_count(pvec))
66 		__pagevec_release(pvec);
67 }
68 
69 static inline void pagevec_release_nonlru(struct pagevec *pvec)
70 {
71 	if (pagevec_count(pvec))
72 		__pagevec_release_nonlru(pvec);
73 }
74 
75 static inline void pagevec_free(struct pagevec *pvec)
76 {
77 	if (pagevec_count(pvec))
78 		__pagevec_free(pvec);
79 }
80 
81 static inline void pagevec_lru_add(struct pagevec *pvec)
82 {
83 	if (pagevec_count(pvec))
84 		__pagevec_lru_add(pvec);
85 }
86