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/*-
* 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.
*
* $FreeBSD$
*/
#ifndef _SYS_SF_BUF_H_
#define _SYS_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 sfstat { /* sendfile statistics */
uint64_t sf_iocnt; /* times sendfile had to do disk I/O */
uint64_t sf_allocfail; /* times sfbuf allocation failed */
uint64_t sf_allocwait; /* times sfbuf allocation had to wait */
};
#ifdef _KERNEL
#include <machine/sf_buf.h>
#include <sys/counter.h>
extern counter_u64_t sfstat[sizeof(struct sfstat) / sizeof(uint64_t)];
#define SFSTAT_ADD(name, val) \
counter_u64_add(sfstat[offsetof(struct sfstat, name) / sizeof(uint64_t)],\
(val))
#define SFSTAT_INC(name) SFSTAT_ADD(name, 1)
#endif /* _KERNEL */
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_ */
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