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

     /*
      * Copyright (c) 2003 Alan L. Cox <alc@cs.rice.edu>.  All rights reserved.
      * Copyright (c) 1998 David Greenman.  All rights reserved.
      *
      * 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.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
     *
     * $DragonFly: src/sys/sys/sfbuf.h,v 1.9 2006/05/20 02:42:13 dillon Exp $
     */
    
    #ifndef _SFBUF_H_
    #define _SFBUF_H_
    
    #ifndef _SYS_TYPES_H_
    #include <sys/types.h>
    #endif
    #ifndef _SYS_QUEUE_H_
    #include <sys/queue.h>
    #endif
    #ifndef _CPU_LWBUF_H_
    #include <cpu/lwbuf.h>
    #endif
    #ifndef _SYS_REFCOUNT_H
    #include <sys/refcount.h>
    #endif
    
    #if !defined(_KERNEL) && !defined(_KERNEL_STRUCTURES)
    #error "This file should not be included by userland programs."
    #endif
    
    struct sf_buf {
            struct lwbuf    *lwbuf; /* lightweight buffer */
            u_int           ref;    /* ref count */
            struct lwbuf    lwbuf_cache;
    };
    
    #define sf_buf_kva(sf)  (lwbuf_kva((sf)->lwbuf))
    #define sf_buf_page(sf) (lwbuf_page((sf)->lwbuf))
    
    
    #if defined(_KERNEL)
    
    struct sf_buf  *sf_buf_alloc(struct vm_page *);
    void            sf_buf_ref(void *);
    int             sf_buf_free(void *);
    
    #endif
    
    #endif

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