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); 25 unsigned pagevec_lookup_entries(struct pagevec *pvec, 26 struct address_space *mapping, 27 pgoff_t start, unsigned nr_entries, 28 pgoff_t *indices); 29 void pagevec_remove_exceptionals(struct pagevec *pvec); 30 unsigned pagevec_lookup_range(struct pagevec *pvec, 31 struct address_space *mapping, 32 pgoff_t *start, pgoff_t end); 33 static inline unsigned pagevec_lookup(struct pagevec *pvec, 34 struct address_space *mapping, 35 pgoff_t *start) 36 { 37 return pagevec_lookup_range(pvec, mapping, start, (pgoff_t)-1); 38 } 39 40 unsigned pagevec_lookup_tag(struct pagevec *pvec, 41 struct address_space *mapping, pgoff_t *index, int tag, 42 unsigned nr_pages); 43 44 static inline void pagevec_init(struct pagevec *pvec, int cold) 45 { 46 pvec->nr = 0; 47 pvec->cold = cold; 48 } 49 50 static inline void pagevec_reinit(struct pagevec *pvec) 51 { 52 pvec->nr = 0; 53 } 54 55 static inline unsigned pagevec_count(struct pagevec *pvec) 56 { 57 return pvec->nr; 58 } 59 60 static inline unsigned pagevec_space(struct pagevec *pvec) 61 { 62 return PAGEVEC_SIZE - pvec->nr; 63 } 64 65 /* 66 * Add a page to a pagevec. Returns the number of slots still available. 67 */ 68 static inline unsigned pagevec_add(struct pagevec *pvec, struct page *page) 69 { 70 pvec->pages[pvec->nr++] = page; 71 return pagevec_space(pvec); 72 } 73 74 static inline void pagevec_release(struct pagevec *pvec) 75 { 76 if (pagevec_count(pvec)) 77 __pagevec_release(pvec); 78 } 79 80 #endif /* _LINUX_PAGEVEC_H */ 81