255c1caae3
there as "kern.ipc.sendfile.readahead". - Push all nsfbuf related tunables into MD code. Don't move them to new namespace in favor of POLA. Reviewed by: scottl Approved by: re (gjb)
67 lines
2.5 KiB
C
67 lines
2.5 KiB
C
/*-
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* Copyright (c) 2003-2004 Alan L. Cox <alc@cs.rice.edu>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _SYS_SF_BUF_H_
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#define _SYS_SF_BUF_H_
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/*
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* Options to sf_buf_alloc() are specified through its flags argument. This
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* argument's value should be the result of a bitwise or'ing of one or more
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* of the following values.
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*/
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#define SFB_CATCH 1 /* Check signals if the allocation
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sleeps. */
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#define SFB_CPUPRIVATE 2 /* Create a CPU private mapping. */
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#define SFB_DEFAULT 0
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#define SFB_NOWAIT 4 /* Return NULL if all bufs are used. */
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struct vm_page;
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struct sfstat { /* sendfile statistics */
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uint64_t sf_iocnt; /* times sendfile had to do disk I/O */
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uint64_t sf_allocfail; /* times sfbuf allocation failed */
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uint64_t sf_allocwait; /* times sfbuf allocation had to wait */
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};
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#ifdef _KERNEL
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#include <machine/sf_buf.h>
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#include <sys/systm.h>
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#include <sys/counter.h>
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struct mbuf; /* for sf_buf_mext() */
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extern counter_u64_t sfstat[sizeof(struct sfstat) / sizeof(uint64_t)];
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#define SFSTAT_ADD(name, val) \
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counter_u64_add(sfstat[offsetof(struct sfstat, name) / sizeof(uint64_t)],\
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(val))
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#define SFSTAT_INC(name) SFSTAT_ADD(name, 1)
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#endif /* _KERNEL */
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int sf_buf_mext(struct mbuf *mb, void *addr, void *args);
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#endif /* !_SYS_SF_BUF_H_ */
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