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: src/sys/sys/sf_buf.h,v 1.4.2.1 2005/03/09 18:59:20 alc Exp $
   27  */
   28 
   29 #ifndef _SYS_SF_BUF_H_
   30 #define _SYS_SF_BUF_H_
   31 
   32 #include <machine/sf_buf.h>
   33 
   34 /*
   35  * Options to sf_buf_alloc() are specified through its flags argument.  This
   36  * argument's value should be the result of a bitwise or'ing of one or more
   37  * of the following values.
   38  */
   39 #define SFB_CATCH       1               /* Check signals if the allocation
   40                                            sleeps. */
   41 #define SFB_CPUPRIVATE  2               /* Create a CPU private mapping. */
   42 #define SFB_DEFAULT     0
   43 #define SFB_NOWAIT      4               /* Return NULL if all bufs are used. */
   44 
   45 struct vm_page;
   46 
   47 extern  int nsfbufs;                    /* Number of sendfile(2) bufs alloced */
   48 extern  int nsfbufspeak;                /* Peak of nsfbufsused */
   49 extern  int nsfbufsused;                /* Number of sendfile(2) bufs in use */
   50 
   51 struct sf_buf *
   52         sf_buf_alloc(struct vm_page *m, int flags);
   53 void    sf_buf_free(struct sf_buf *sf);
   54 void    sf_buf_mext(void *addr, void *args);
   55 
   56 #endif /* !_SYS_SF_BUF_H_ */

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