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(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 31 static inline void pagevec_init(struct pagevec *pvec, int cold) 32 { 33 pvec->nr = 0; 34 pvec->cold = cold; 35 } 36 37 static inline void pagevec_reinit(struct pagevec *pvec) 38 { 39 pvec->nr = 0; 40 } 41 42 static inline unsigned pagevec_count(struct pagevec *pvec) 43 { 44 return pvec->nr; 45 } 46 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 */ 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 61 static inline void pagevec_release(struct pagevec *pvec) 62 { 63 if (pagevec_count(pvec)) 64 __pagevec_release(pvec); 65 } 66 67 #endif /* _LINUX_PAGEVEC_H */ 68