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FreeBSD/Linux Kernel Cross Reference
sys/vm/swap_pager.h

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    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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