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 void pagevec_remove_exceptionals(struct pagevec *pvec); 29 unsigned pagevec_lookup_range(struct pagevec *pvec, 30 struct address_space *mapping, 31 pgoff_t *start, pgoff_t end); 32 static inline unsigned pagevec_lookup(struct pagevec *pvec, 33 struct address_space *mapping, 34 pgoff_t *start) 35 { 36 return pagevec_lookup_range(pvec, mapping, start, (pgoff_t)-1); 37 } 38 39 unsigned pagevec_lookup_range_tag(struct pagevec *pvec, 40 struct address_space *mapping, pgoff_t *index, pgoff_t end, 41 xa_mark_t tag); 42 static inline unsigned pagevec_lookup_tag(struct pagevec *pvec, 43 struct address_space *mapping, pgoff_t *index, xa_mark_t tag) 44 { 45 return pagevec_lookup_range_tag(pvec, mapping, index, (pgoff_t)-1, tag); 46 } 47 48 static inline void pagevec_init(struct pagevec *pvec) 49 { 50 pvec->nr = 0; 51 pvec->percpu_pvec_drained = false; 52 } 53 54 static inline void pagevec_reinit(struct pagevec *pvec) 55 { 56 pvec->nr = 0; 57 } 58 59 static inline unsigned pagevec_count(struct pagevec *pvec) 60 { 61 return pvec->nr; 62 } 63 64 static inline unsigned pagevec_space(struct pagevec *pvec) 65 { 66 return PAGEVEC_SIZE - pvec->nr; 67 } 68 69 /* 70 * Add a page to a pagevec. Returns the number of slots still available. 71 */ 72 static inline unsigned pagevec_add(struct pagevec *pvec, struct page *page) 73 { 74 pvec->pages[pvec->nr++] = page; 75 return pagevec_space(pvec); 76 } 77 78 static inline void pagevec_release(struct pagevec *pvec) 79 { 80 if (pagevec_count(pvec)) 81 __pagevec_release(pvec); 82 } 83 84 #endif /* _LINUX_PAGEVEC_H */ 85