/*-
 * Copyright (c) 2003-2004 Alan L. Cox <alc@cs.rice.edu>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * $FreeBSD: src/sys/sys/sf_buf.h,v 1.5 2004/11/08 00:43:46 alc Exp $
 */

#ifndef _SYS_SF_BUF_H_
#define _SYS_SF_BUF_H_

#include <machine/sf_buf.h>

/*
 * Options to sf_buf_alloc() are specified through its flags argument.  This
 * argument's value should be the result of a bitwise or'ing of one or more
 * of the following values.
 */
#define	SFB_CATCH	1		/* Check signals if the allocation
					   sleeps. */
#define	SFB_CPUPRIVATE	2		/* Create a CPU private mapping. */
#define	SFB_DEFAULT	0
#define	SFB_NOWAIT	4		/* Return NULL if all bufs are used. */

struct vm_page;

extern  int nsfbufs;                    /* Number of sendfile(2) bufs alloced */
extern  int nsfbufspeak;                /* Peak of nsfbufsused */
extern  int nsfbufsused;                /* Number of sendfile(2) bufs in use */

struct sf_buf *
	sf_buf_alloc(struct vm_page *m, int flags);
void	sf_buf_free(struct sf_buf *sf);
void	sf_buf_mext(void *addr, void *args);

#endif /* !_SYS_SF_BUF_H_ */
