1 /* 2 * Copyright (c) 2020 François Tigeot <ftigeot@wolfpond.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice unmodified, this list of conditions, and the following 10 * disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27 #ifndef _LINUX_PAGEVEC_H_ 28 #define _LINUX_PAGEVEC_H_ 29 30 #define PAGEVEC_SIZE 15 31 32 struct page; 33 34 struct pagevec { 35 unsigned char nr; 36 bool pv_unused0; 37 struct page *pages[PAGEVEC_SIZE]; 38 }; 39 40 static inline void 41 pagevec_init(struct pagevec *pvec) 42 { 43 pvec->nr = 0; 44 } 45 46 static inline unsigned int 47 pagevec_count(struct pagevec *pvec) 48 { 49 return pvec->nr; 50 } 51 52 static inline unsigned int 53 pagevec_add(struct pagevec *pvec, struct page *page) 54 { 55 pvec->pages[pvec->nr] = page; 56 pvec->nr++; 57 58 return (PAGEVEC_SIZE - pvec->nr); 59 } 60 61 static inline void 62 __pagevec_release(struct pagevec *pvec) 63 { 64 for (int i = 0; i < pvec->nr; i++) 65 put_page(pvec->pages[i]); 66 67 pvec->nr = 0; 68 } 69 70 static inline unsigned int 71 pagevec_space(struct pagevec *pvec) 72 { 73 return PAGEVEC_SIZE - pvec->nr; 74 } 75 76 #endif /* _LINUX_PAGEVEC_H_ */ 77