1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * include/linux/pagevec.h 4 * 5 * In many places it is efficient to batch an operation up against multiple 6 * pages. A pagevec is a multipage container which is used for that. 7 */ 8 9 #ifndef _LINUX_PAGEVEC_H 10 #define _LINUX_PAGEVEC_H 11 12 /* 14 pointers + two long's align the pagevec structure to a power of two */ 13 #define PAGEVEC_SIZE 14 14 15 struct page; 16 struct address_space; 17 18 struct pagevec { 19 unsigned long nr; 20 unsigned long cold; 21 struct page *pages[PAGEVEC_SIZE]; 22 }; 23 24 void __pagevec_release(struct pagevec *pvec); 25 void __pagevec_lru_add(struct pagevec *pvec); 26 unsigned pagevec_lookup_entries(struct pagevec *pvec, 27 struct address_space *mapping, 28 pgoff_t start, unsigned nr_entries, 29 pgoff_t *indices); 30 void pagevec_remove_exceptionals(struct pagevec *pvec); 31 unsigned pagevec_lookup_range(struct pagevec *pvec, 32 struct address_space *mapping, 33 pgoff_t *start, pgoff_t end); 34 static inline unsigned pagevec_lookup(struct pagevec *pvec, 35 struct address_space *mapping, 36 pgoff_t *start) 37 { 38 return pagevec_lookup_range(pvec, mapping, start, (pgoff_t)-1); 39 } 40 41 unsigned pagevec_lookup_range_tag(struct pagevec *pvec, 42 struct address_space *mapping, pgoff_t *index, pgoff_t end, 43 int tag, unsigned nr_pages); 44 static inline unsigned pagevec_lookup_tag(struct pagevec *pvec, 45 struct address_space *mapping, pgoff_t *index, int tag, 46 unsigned nr_pages) 47 { 48 return pagevec_lookup_range_tag(pvec, mapping, index, (pgoff_t)-1, tag, 49 nr_pages); 50 } 51 52 static inline void pagevec_init(struct pagevec *pvec, int cold) 53 { 54 pvec->nr = 0; 55 pvec->cold = cold; 56 } 57 58 static inline void pagevec_reinit(struct pagevec *pvec) 59 { 60 pvec->nr = 0; 61 } 62 63 static inline unsigned pagevec_count(struct pagevec *pvec) 64 { 65 return pvec->nr; 66 } 67 68 static inline unsigned pagevec_space(struct pagevec *pvec) 69 { 70 return PAGEVEC_SIZE - pvec->nr; 71 } 72 73 /* 74 * Add a page to a pagevec. Returns the number of slots still available. 75 */ 76 static inline unsigned pagevec_add(struct pagevec *pvec, struct page *page) 77 { 78 pvec->pages[pvec->nr++] = page; 79 return pagevec_space(pvec); 80 } 81 82 static inline void pagevec_release(struct pagevec *pvec) 83 { 84 if (pagevec_count(pvec)) 85 __pagevec_release(pvec); 86 } 87 88 #endif /* _LINUX_PAGEVEC_H */ 89