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
pagevec_init(struct pagevec * pvec)41 pagevec_init(struct pagevec *pvec)
42 {
43 pvec->nr = 0;
44 }
45
46 static inline unsigned int
pagevec_count(struct pagevec * pvec)47 pagevec_count(struct pagevec *pvec)
48 {
49 return pvec->nr;
50 }
51
52 static inline unsigned int
pagevec_add(struct pagevec * pvec,struct page * page)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
__pagevec_release(struct pagevec * pvec)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
pagevec_space(struct pagevec * pvec)71 pagevec_space(struct pagevec *pvec)
72 {
73 return PAGEVEC_SIZE - pvec->nr;
74 }
75
76 #endif /* _LINUX_PAGEVEC_H_ */
77