sys/sys/sfbuf.h

   1 /*
   2  * Copyright (c) 2003 Alan L. Cox <alc@cs.rice.edu>.  All rights reserved.
   3  * Copyright (c) 1998 David Greenman.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  *
  26  * $DragonFly: src/sys/sys/sfbuf.h,v 1.9 2006/05/20 02:42:13 dillon Exp $
  27  */
  28
  29 #ifndef _SFBUF_H_
  30 #define _SFBUF_H_
  31
  32 #ifndef _SYS_TYPES_H_
  33 #include <sys/types.h>
  34 #endif
  35 #ifndef _SYS_QUEUE_H_
  36 #include <sys/queue.h>
  37 #endif
  38 #ifndef _CPU_LWBUF_H_
  39 #include <cpu/lwbuf.h>
  40 #endif
  41 #ifndef _SYS_REFCOUNT_H
  42 #include <sys/refcount.h>
  43 #endif
  44
  45 #if !defined(_KERNEL) && !defined(_KERNEL_STRUCTURES)
  46 #error "This file should not be included by userland programs."
  47 #endif
  48
  49 struct sf_buf {
  50         struct lwbuf    *lwbuf; /* lightweight buffer */
  51         u_int           ref;    /* ref count */
  52         struct lwbuf    lwbuf_cache;
  53 };
  54
  55 #define sf_buf_kva(sf)  (lwbuf_kva((sf)->lwbuf))
  56 #define sf_buf_page(sf) (lwbuf_page((sf)->lwbuf))
  57
  58
  59 #if defined(_KERNEL)
  60
  61 struct sf_buf  *sf_buf_alloc(struct vm_page *);
  62 void            sf_buf_ref(void *);
  63 int             sf_buf_free(void *);
  64
  65 #endif
  66
  67 #endif