The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/sys/sf_buf.h

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    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: releng/10.0/sys/sys/sf_buf.h 255786 2013-09-22 13:36:52Z glebius $
   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 
   43 struct vm_page;
   44 
   45 struct 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>
   55 struct mbuf;    /* for sf_buf_mext() */
   56 
   57 extern 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 
   64 int     sf_buf_mext(struct mbuf *mb, void *addr, void *args);
   65 
   66 #endif /* !_SYS_SF_BUF_H_ */

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