Pull the sf_buf routines and structures out into its own files in
[dragonfly.git] / sys / sys / sfbuf.h
CommitLineData
4860553a
JH
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 1.1 2003/12/10 23:48:07 hsu Exp $
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 */
38};
39
40extern int nsfbufs;
41
42struct sf_buf *sf_buf_alloc(struct vm_page *);
43void sf_buf_free(caddr_t addr, u_int size);
44void sf_buf_ref(caddr_t addr, u_int size);
45
46#endif