FreeBSD/Linux Kernel Cross Reference
sys/vm/swap_pager.h
1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1990 University of Utah.
5 * Copyright (c) 1991 The Regents of the University of California.
6 * All rights reserved.
7 *
8 * This code is derived from software contributed to Berkeley by
9 * the Systems Programming Group of the University of Utah Computer
10 * Science Department.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 * from: @(#)swap_pager.h 7.1 (Berkeley) 12/5/90
37 * $FreeBSD: releng/12.0/sys/vm/swap_pager.h 326023 2017-11-20 19:43:44Z pfg $
38 */
39
40 #ifndef _VM_SWAP_PAGER_H_
41 #define _VM_SWAP_PAGER_H_ 1
42
43 typedef int32_t swblk_t; /*
44 * swap offset. This is the type used to
45 * address the "virtual swap device" and
46 * therefore the maximum swap space is
47 * 2^32 pages.
48 */
49
50 struct buf;
51 struct swdevt;
52 typedef void sw_strategy_t(struct buf *, struct swdevt *);
53 typedef void sw_close_t(struct thread *, struct swdevt *);
54
55 /*
56 * Swap device table
57 */
58 struct swdevt {
59 int sw_flags;
60 int sw_nblks;
61 int sw_used;
62 dev_t sw_dev;
63 struct vnode *sw_vp;
64 void *sw_id;
65 swblk_t sw_first;
66 swblk_t sw_end;
67 struct blist *sw_blist;
68 TAILQ_ENTRY(swdevt) sw_list;
69 sw_strategy_t *sw_strategy;
70 sw_close_t *sw_close;
71 };
72
73 #define SW_UNMAPPED 0x01
74 #define SW_CLOSING 0x04
75
76 #ifdef _KERNEL
77
78 extern int swap_pager_avail;
79
80 struct xswdev;
81 int swap_dev_info(int name, struct xswdev *xs, char *devname, size_t len);
82 void swap_pager_copy(vm_object_t, vm_object_t, vm_pindex_t, int);
83 vm_pindex_t swap_pager_find_least(vm_object_t object, vm_pindex_t pindex);
84 void swap_pager_freespace(vm_object_t, vm_pindex_t, vm_size_t);
85 void swap_pager_swap_init(void);
86 int swap_pager_nswapdev(void);
87 int swap_pager_reserve(vm_object_t, vm_pindex_t, vm_size_t);
88 void swap_pager_status(int *total, int *used);
89 void swapoff_all(void);
90
91 #endif /* _KERNEL */
92 #endif /* _VM_SWAP_PAGER_H_ */
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