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 #include <linux/xarray.h> 13 14 /* 15 pointers + header align the pagevec structure to a power of two */ 15 #define PAGEVEC_SIZE 15 16 17 struct page; 18 struct address_space; 19 20 struct pagevec { 21 unsigned char nr; 22 bool percpu_pvec_drained; 23 struct page *pages[PAGEVEC_SIZE]; 24 }; 25 26 void __pagevec_release(struct pagevec *pvec); 27 void __pagevec_lru_add(struct pagevec *pvec); 28 unsigned pagevec_lookup_entries(struct pagevec *pvec, 29 struct address_space *mapping, 30 pgoff_t start, unsigned nr_entries, 31 pgoff_t *indices); 32 void pagevec_remove_exceptionals(struct pagevec *pvec); 33 unsigned pagevec_lookup_range(struct pagevec *pvec, 34 struct address_space *mapping, 35 pgoff_t *start, pgoff_t end); 36 static inline unsigned pagevec_lookup(struct pagevec *pvec, 37 struct address_space *mapping, 38 pgoff_t *start) 39 { 40 return pagevec_lookup_range(pvec, mapping, start, (pgoff_t)-1); 41 } 42 43 unsigned pagevec_lookup_range_tag(struct pagevec *pvec, 44 struct address_space *mapping, pgoff_t *index, pgoff_t end, 45 xa_mark_t tag); 46 unsigned pagevec_lookup_range_nr_tag(struct pagevec *pvec, 47 struct address_space *mapping, pgoff_t *index, pgoff_t end, 48 xa_mark_t tag, unsigned max_pages); 49 static inline unsigned pagevec_lookup_tag(struct pagevec *pvec, 50 struct address_space *mapping, pgoff_t *index, xa_mark_t tag) 51 { 52 return pagevec_lookup_range_tag(pvec, mapping, index, (pgoff_t)-1, tag); 53 } 54 55 static inline void pagevec_init(struct pagevec *pvec) 56 { 57 pvec->nr = 0; 58 pvec->percpu_pvec_drained = false; 59 } 60 61 static inline void pagevec_reinit(struct pagevec *pvec) 62 { 63 pvec->nr = 0; 64 } 65 66 static inline unsigned pagevec_count(struct pagevec *pvec) 67 { 68 return pvec->nr; 69 } 70 71 static inline unsigned pagevec_space(struct pagevec *pvec) 72 { 73 return PAGEVEC_SIZE - pvec->nr; 74 } 75 76 /* 77 * Add a page to a pagevec. Returns the number of slots still available. 78 */ 79 static inline unsigned pagevec_add(struct pagevec *pvec, struct page *page) 80 { 81 pvec->pages[pvec->nr++] = page; 82 return pagevec_space(pvec); 83 } 84 85 static inline void pagevec_release(struct pagevec *pvec) 86 { 87 if (pagevec_count(pvec)) 88 __pagevec_release(pvec); 89 } 90 91 #endif /* _LINUX_PAGEVEC_H */ 92