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_release_nonlru(struct pagevec *pvec); 25void __pagevec_free(struct pagevec *pvec); 26void __pagevec_lru_add(struct pagevec *pvec); 27void __pagevec_lru_add_active(struct pagevec *pvec); 28void pagevec_strip(struct pagevec *pvec); 29unsigned pagevec_lookup(struct pagevec *pvec, struct address_space *mapping, 30 pgoff_t start, unsigned nr_pages); 31unsigned pagevec_lookup_tag(struct pagevec *pvec, 32 struct address_space *mapping, pgoff_t *index, int tag, 33 unsigned nr_pages); 34 35static inline void pagevec_init(struct pagevec *pvec, int cold) 36{ 37 pvec->nr = 0; 38 pvec->cold = cold; 39} 40 41static inline void pagevec_reinit(struct pagevec *pvec) 42{ 43 pvec->nr = 0; 44} 45 46static inline unsigned pagevec_count(struct pagevec *pvec) 47{ 48 return pvec->nr; 49} 50 51static inline unsigned pagevec_space(struct pagevec *pvec) 52{ 53 return PAGEVEC_SIZE - pvec->nr; 54} 55 56/* 57 * Add a page to a pagevec. Returns the number of slots still available. 58 */ 59static inline unsigned pagevec_add(struct pagevec *pvec, struct page *page) 60{ 61 pvec->pages[pvec->nr++] = page; 62 return pagevec_space(pvec); 63} 64 65 66static inline void pagevec_release(struct pagevec *pvec) 67{ 68 if (pagevec_count(pvec)) 69 __pagevec_release(pvec); 70} 71 72static inline void pagevec_release_nonlru(struct pagevec *pvec) 73{ 74 if (pagevec_count(pvec)) 75 __pagevec_release_nonlru(pvec); 76} 77 78static inline void pagevec_free(struct pagevec *pvec) 79{ 80 if (pagevec_count(pvec)) 81 __pagevec_free(pvec); 82} 83 84static inline void pagevec_lru_add(struct pagevec *pvec) 85{ 86 if (pagevec_count(pvec)) 87 __pagevec_lru_add(pvec); 88} 89 90#endif /* _LINUX_PAGEVEC_H */ 91