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 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 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