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

     /*
      * Copyright (c) 1990 University of Utah.
      * Copyright (c) 1991 The Regents of the University of California.
      * All rights reserved.
      *
      * This code is derived from software contributed to Berkeley by
      * the Systems Programming Group of the University of Utah Computer
      * Science Department.
      *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by the University of
     *      California, Berkeley and its contributors.
     * 4. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      from: @(#)swap_pager.h  7.1 (Berkeley) 12/5/90
     * $FreeBSD$
     */
    
    /*
     * Modifications to the block allocation data structure by John S. Dyson
     * 18 Dec 93.
     */
    
    #ifndef _SWAP_PAGER_
    #define _SWAP_PAGER_    1
    
    /*
     * SWB_NPAGES can be set to any value from 1 to 16 pages per allocation,
     * however, due to the allocation spilling into non-swap pager backed memory,
     * suggest keeping SWB_NPAGES small (1-4).  If high performance is mandatory
     * perhaps up to 8 pages might be in order????
     * Above problem has been fixed, now we support 16 pages per block.  Unused
     * space is recovered by the swap pager now...
     */
    #if !defined(SWB_NPAGES)
    #define SWB_NPAGES 8
    #endif
    
    struct swblock {
            unsigned short swb_valid;       /* bitmask for valid pages */
            unsigned short swb_locked;      /* block locked */
            daddr_t swb_block[SWB_NPAGES];
    };
    typedef struct swblock *sw_blk_t;
    
    #ifdef KERNEL
    extern struct pagerlst swap_pager_un_object_list;
    extern int swap_pager_full;
    extern struct rlisthdr swaplist;
    
    int swap_pager_putpages __P((vm_object_t, vm_page_t *, int, boolean_t, int *));    
    int swap_pager_swp_alloc __P((vm_object_t, int));
    void swap_pager_copy __P((vm_object_t, vm_pindex_t, vm_object_t,
            vm_pindex_t, vm_pindex_t, int));
    void swap_pager_freespace __P((vm_object_t, vm_pindex_t, vm_size_t));
    void swap_pager_dmzspace __P((vm_object_t, vm_pindex_t, vm_size_t));
    void swap_pager_swap_init __P((void));
    void swap_pager_sync __P((void));
    #endif
    
    #endif                          /* _SWAP_PAGER_ */

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