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 * $FreeBSD$
27 */
28
29#ifndef _SYS_SF_BUF_H_
30#define _SYS_SF_BUF_H_
31
32/*
33 * Options to sf_buf_alloc() are specified through its flags argument.  This
34 * argument's value should be the result of a bitwise or'ing of one or more
35 * of the following values.
36 */
37#define	SFB_CATCH	1		/* Check signals if the allocation
38					   sleeps. */
39#define	SFB_CPUPRIVATE	2		/* Create a CPU private mapping. */
40#define	SFB_DEFAULT	0
41#define	SFB_NOWAIT	4		/* Return NULL if all bufs are used. */
42
43struct vm_page;
44
45struct sfstat {				/* sendfile statistics */
46	uint64_t	sf_iocnt;	/* times sendfile had to do disk I/O */
47	uint64_t	sf_allocfail;	/* times sfbuf allocation failed */
48	uint64_t	sf_allocwait;	/* times sfbuf allocation had to wait */
49};
50
51#ifdef _KERNEL
52#include <machine/sf_buf.h>
53#include <sys/systm.h>
54#include <sys/counter.h>
55struct mbuf;	/* for sf_buf_mext() */
56
57extern counter_u64_t sfstat[sizeof(struct sfstat) / sizeof(uint64_t)];
58#define	SFSTAT_ADD(name, val)	\
59    counter_u64_add(sfstat[offsetof(struct sfstat, name) / sizeof(uint64_t)],\
60	(val))
61#define	SFSTAT_INC(name)	SFSTAT_ADD(name, 1)
62#endif /* _KERNEL */
63
64int	sf_buf_mext(struct mbuf *mb, void *addr, void *args);
65
66#endif /* !_SYS_SF_BUF_H_ */
67