kernel - Introduce lightweight buffers
[dragonfly.git] / sys / sys / sfbuf.h
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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 *
1bd40720 26 * $DragonFly: src/sys/sys/sfbuf.h,v 1.9 2006/05/20 02:42:13 dillon Exp $
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27 */
28
29#ifndef _SFBUF_H_
30#define _SFBUF_H_
31
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32#ifndef _SYS_TYPES_H_
33#include <sys/types.h>
34#endif
35#ifndef _SYS_QUEUE_H_
36#include <sys/queue.h>
37#endif
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38#ifndef _CPU_LWBUF_H_
39#include <cpu/lwbuf.h>
40#endif
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41
42
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43#if !defined(_KERNEL) && !defined(_KERNEL_STRUCTURES)
44#error "This file should not be included by userland programs."
45#endif
46
4860553a 47struct sf_buf {
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48 struct lwbuf *lwbuf; /* lightweight buffer */
49 int refs;
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50};
51
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52#define sf_buf_kva(sf) (lwbuf_kva((sf)->lwbuf))
53#define sf_buf_page(sf) (lwbuf_page((sf)->lwbuf))
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54
55
56#if defined(_KERNEL)
57
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58struct sf_buf *sf_buf_alloc(struct vm_page *);
59void sf_buf_ref(void *);
60int sf_buf_free(void *);
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61
62#endif
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63
64#endif