The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/sys/swap.h

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    1 /*      $NetBSD: swap.h,v 1.5 2000/11/17 11:32:55 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  * 3. The name of the author may not be used to endorse or promote products
   16  *    derived from this software without specific prior written permission
   17  *
   18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   21  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   22  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   23  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   28  */
   29 
   30 #ifndef _SYS_SWAP_H_
   31 #define _SYS_SWAP_H_
   32 
   33 #include <sys/syslimits.h>
   34 
   35 /* These structures are used to return swap information for userland */
   36 
   37 /*
   38  * NetBSD 1.3 swapctl(SWAP_STATS, ...) swapent structure; now used as an
   39  * overlay for both the new swapent structure, and the hidden swapdev
   40  * structure (see sys/uvm/uvm_swap.c).
   41  */
   42 struct oswapent {
   43         dev_t   ose_dev;                /* device id */
   44         int     ose_flags;              /* flags */
   45         int     ose_nblks;              /* total blocks */
   46         int     ose_inuse;              /* blocks in use */
   47         int     ose_priority;           /* priority of this device */
   48 };
   49 
   50 struct swapent {
   51         struct oswapent se_ose;
   52 #define se_dev          se_ose.ose_dev
   53 #define se_flags        se_ose.ose_flags
   54 #define se_nblks        se_ose.ose_nblks
   55 #define se_inuse        se_ose.ose_inuse
   56 #define se_priority     se_ose.ose_priority
   57         char    se_path[PATH_MAX+1];    /* path name */
   58 };
   59 
   60 #define SWAP_ON         1               /* begin swapping on device */
   61 #define SWAP_OFF        2               /* stop swapping on device */
   62 #define SWAP_NSWAP      3               /* how many swap devices ? */
   63 #define SWAP_OSTATS     4               /* old SWAP_STATS, no se_path */
   64 #define SWAP_CTL        5               /* change priority on device */
   65 #define SWAP_STATS      6               /* get device info */
   66 #define SWAP_DUMPDEV    7               /* use this device as dump device */
   67 #define SWAP_GETDUMPDEV 8               /* use this device as dump device */
   68 
   69 #define SWF_INUSE       0x00000001      /* in use: we have swapped here */
   70 #define SWF_ENABLE      0x00000002      /* enabled: we can swap here */
   71 #define SWF_BUSY        0x00000004      /* busy: I/O happening here */
   72 #define SWF_FAKE        0x00000008      /* fake: still being built */
   73 
   74 #endif /* _SYS_SWAP_H_ */

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