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