FreeBSD/Linux Kernel Cross Reference
sys/sys/swap.h
1 /* $NetBSD: swap.h,v 1.7 2008/05/29 14:51:27 mrg Exp $ */
2
3 /*
4 * Copyright (c) 1995, 1996, 1998 Matthew R. Green
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28 #ifndef _SYS_SWAP_H_
29 #define _SYS_SWAP_H_
30
31 #include <sys/syslimits.h>
32
33 /* These structures are used to return swap information for userland */
34
35 /*
36 * NetBSD 1.3 swapctl(SWAP_STATS, ...) swapent structure; now used as an
37 * overlay for both the new swapent structure, and the hidden swapdev
38 * structure (see sys/uvm/uvm_swap.c).
39 */
40 struct oswapent {
41 dev_t ose_dev; /* device id */
42 int ose_flags; /* flags */
43 int ose_nblks; /* total blocks */
44 int ose_inuse; /* blocks in use */
45 int ose_priority; /* priority of this device */
46 };
47
48 struct swapent {
49 struct oswapent se_ose;
50 #define se_dev se_ose.ose_dev
51 #define se_flags se_ose.ose_flags
52 #define se_nblks se_ose.ose_nblks
53 #define se_inuse se_ose.ose_inuse
54 #define se_priority se_ose.ose_priority
55 char se_path[PATH_MAX+1]; /* path name */
56 };
57
58 #define SWAP_ON 1 /* begin swapping on device */
59 #define SWAP_OFF 2 /* stop swapping on device */
60 #define SWAP_NSWAP 3 /* how many swap devices ? */
61 #define SWAP_OSTATS 4 /* old SWAP_STATS, no se_path */
62 #define SWAP_CTL 5 /* change priority on device */
63 #define SWAP_STATS 6 /* get device info */
64 #define SWAP_DUMPDEV 7 /* use this device as dump device */
65 #define SWAP_GETDUMPDEV 8 /* use this device as dump device */
66 #define SWAP_DUMPOFF 9 /* stop using the dump device */
67
68 #define SWF_INUSE 0x00000001 /* in use: we have swapped here */
69 #define SWF_ENABLE 0x00000002 /* enabled: we can swap here */
70 #define SWF_BUSY 0x00000004 /* busy: I/O happening here */
71 #define SWF_FAKE 0x00000008 /* fake: still being built */
72
73 #endif /* _SYS_SWAP_H_ */
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