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 14struct page; 15struct address_space; 16 17struct pagevec { 18 unsigned long nr; 19 unsigned long cold; 20 struct page *pages[PAGEVEC_SIZE]; 21}; 22 23void __pagevec_release(struct pagevec *pvec); 24void __pagevec_lru_add(struct pagevec *pvec); 25unsigned pagevec_lookup_entries(struct pagevec *pvec, 26 struct address_space *mapping, 27 pgoff_t start, unsigned nr_entries, 28 pgoff_t *indices); 29void pagevec_remove_exceptionals(struct pagevec *pvec); 30unsigned pagevec_lookup(struct pagevec *pvec, struct address_space *mapping, 31 pgoff_t start, unsigned nr_pages); 32unsigned pagevec_lookup_tag(struct pagevec *pvec, 33 struct address_space *mapping, pgoff_t *index, int tag, 34 unsigned nr_pages); 35 36static inline void pagevec_init(struct pagevec *pvec, int cold) 37{ 38 pvec->nr = 0; 39 pvec->cold = cold; 40} 41 42static inline void pagevec_reinit(struct pagevec *pvec) 43{ 44 pvec->nr = 0; 45} 46 47static inline unsigned pagevec_count(struct pagevec *pvec) 48{ 49 return pvec->nr; 50} 51 52static inline unsigned pagevec_space(struct pagevec *pvec) 53{ 54 return PAGEVEC_SIZE - pvec->nr; 55} 56 57/* 58 * Add a page to a pagevec. Returns the number of slots still available. 59 */ 60static inline unsigned pagevec_add(struct pagevec *pvec, struct page *page) 61{ 62 pvec->pages[pvec->nr++] = page; 63 return pagevec_space(pvec); 64} 65 66static inline void pagevec_release(struct pagevec *pvec) 67{ 68 if (pagevec_count(pvec)) 69 __pagevec_release(pvec); 70} 71 72#endif /* _LINUX_PAGEVEC_H */ 73