Fix an unused variable warning (non-operational).
[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 *
b4caac98 26 * $DragonFly: src/sys/sys/sfbuf.h,v 1.3 2004/03/29 15:46:21 dillon Exp $
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27 */
28
29#ifndef _SFBUF_H_
30#define _SFBUF_H_
31
32struct sf_buf {
33 LIST_ENTRY(sf_buf) list_entry; /* hash chain of active buffers */
34 TAILQ_ENTRY(sf_buf) free_entry; /* list of free buffers */
35 struct vm_page *m; /* currently mapped page */
36 vm_offset_t kva; /* va of mapping */
37 int refcnt; /* usage of this mapping */
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38 int aux1; /* auxillary counter TEMPORARY HACK */
39 int aux2; /* auxillary counter TEMPORARY HACK */
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40};
41
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42static __inline vm_offset_t
43sf_buf_kva(struct sf_buf *sf)
44{
45 return(sf->kva);
46}
47
48static __inline struct vm_page *
49sf_buf_page(struct sf_buf *sf)
50{
51 return(sf->m);
52}
53
54
55#if defined(_KERNEL)
56
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57extern int nsfbufs;
58
59struct sf_buf *sf_buf_alloc(struct vm_page *);
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60void sf_buf_free(struct sf_buf *);
61void sf_buf_ref(struct sf_buf *);
62struct sf_buf *sf_buf_tosf(caddr_t addr);
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63
64#endif
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65
66#endif