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

     /*-
      * SPDX-License-Identifier: BSD-3-Clause
      *
      * 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. 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
     * $FreeBSD$
     */
    
    #ifndef _VM_SWAP_PAGER_H_
    #define _VM_SWAP_PAGER_H_
    
    #include <sys/_types.h>
    
    struct buf;
    struct swdevt;
    struct thread;
    typedef void sw_strategy_t(struct buf *, struct swdevt *);
    typedef void sw_close_t(struct thread *, struct swdevt *);
    
    /*
     * Swap device table
     */
    struct swdevt {
            int     sw_flags;
            int     sw_nblks;
            int     sw_used;
            dev_t   sw_dev;
            struct vnode *sw_vp;
            void    *sw_id;
            __daddr_t sw_first;
            __daddr_t sw_end;
            struct blist *sw_blist;
            TAILQ_ENTRY(swdevt)     sw_list;
            sw_strategy_t           *sw_strategy;
            sw_close_t              *sw_close;
    };
    
    #define SW_UNMAPPED     0x01
    #define SW_CLOSING      0x04
    
    #ifdef _KERNEL
    
    extern int swap_pager_avail;
    extern int nsw_cluster_max;
    
    struct xswdev;
    int swap_dev_info(int name, struct xswdev *xs, char *devname, size_t len);
    void swap_pager_copy(vm_object_t, vm_object_t, vm_pindex_t, int);
    vm_pindex_t swap_pager_find_least(vm_object_t object, vm_pindex_t pindex);
    void swap_pager_freespace(vm_object_t object, vm_pindex_t start,
        vm_size_t size, vm_size_t *freed);
    void swap_pager_swap_init(void);
    int swap_pager_nswapdev(void);
    int swap_pager_reserve(vm_object_t, vm_pindex_t, vm_pindex_t);
    void swap_pager_status(int *total, int *used);
    u_long swap_pager_swapped_pages(vm_object_t object);
    void swapoff_all(void);
    bool swap_pager_init_object(vm_object_t object, void *handle,
        struct ucred *cred, vm_ooffset_t size, vm_ooffset_t offset);
    #endif                          /* _KERNEL */
    #endif                          /* _VM_SWAP_PAGER_H_ */

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