1 /*
2 * Copyright (c) 2015-2018 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_SWAP_H_
28 #define _LINUX_SWAP_H_
29
30 #include <linux/spinlock.h>
31 #include <linux/mmzone.h>
32 #include <linux/list.h>
33 #include <linux/sched.h>
34 #include <linux/fs.h>
35 #include <linux/atomic.h>
36 #include <asm/page.h>
37
38 #include <vm/vm_page2.h>
39
mark_page_accessed(struct page * m)40 static inline void mark_page_accessed(struct page *m)
41 {
42 vm_page_flag_set((struct vm_page *)m, PG_REFERENCED);
43 }
44
45 /* from vm/swap_pager.h */
46 #include <sys/conf.h>
47 extern int nswdev;
48 extern struct swdevt *swdevt;
49
50 static inline long
get_nr_swap_pages(void)51 get_nr_swap_pages(void)
52 {
53 int n;
54 struct swdevt *sp;
55 long total_pages = 0;
56 long used_pages = 0;
57
58 for (n = 0; n < nswdev; n++) {
59 sp = &swdevt[n];
60
61 total_pages += sp->sw_nblks;
62 used_pages += sp->sw_nused;
63 }
64
65 return (total_pages - used_pages);
66 }
67
68 #endif /* _LINUX_SWAP_H_ */
69