sf_buf.h revision 137372 
1/*-
2 * Copyright (c) 2003-2004 Alan L. Cox <alc@cs.rice.edu>
3 * 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 * $FreeBSD: head/sys/sys/sf_buf.h 137372 2004-11-08 00:43:46Z alc $
27 */
28
29#ifndef _SYS_SF_BUF_H_
30#define _SYS_SF_BUF_H_
31
32#include <machine/sf_buf.h>
33
34/*
35 * Options to sf_buf_alloc() are specified through its flags argument.  This
36 * argument's value should be the result of a bitwise or'ing of one or more
37 * of the following values.
38 */
39#define	SFB_CATCH	1		/* Check signals if the allocation
40					   sleeps. */
41#define	SFB_CPUPRIVATE	2		/* Create a CPU private mapping. */
42#define	SFB_DEFAULT	0
43#define	SFB_NOWAIT	4		/* Return NULL if all bufs are used. */
44
45struct vm_page;
46
47extern  int nsfbufs;                    /* Number of sendfile(2) bufs alloced */
48extern  int nsfbufspeak;                /* Peak of nsfbufsused */
49extern  int nsfbufsused;                /* Number of sendfile(2) bufs in use */
50
51struct sf_buf *
52	sf_buf_alloc(struct vm_page *m, int flags);
53void	sf_buf_free(struct sf_buf *sf);
54void	sf_buf_mext(void *addr, void *args);
55
56#endif /* !_SYS_SF_BUF_H_ */
57