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/bufq_impl.h

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    1 /*      $NetBSD: bufq_impl.h,v 1.10 2016/11/16 00:46:46 pgoyette Exp $  */
    2 /*      NetBSD: bufq.h,v 1.3 2005/03/31 11:28:53 yamt Exp       */
    3 /*      NetBSD: buf.h,v 1.75 2004/09/18 16:40:11 yamt Exp       */
    4 
    5 /*-
    6  * Copyright (c) 1999, 2000 The NetBSD Foundation, Inc.
    7  * All rights reserved.
    8  *
    9  * This code is derived from software contributed to The NetBSD Foundation
   10  * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
   11  * NASA Ames Research Center.
   12  *
   13  * Redistribution and use in source and binary forms, with or without
   14  * modification, are permitted provided that the following conditions
   15  * are met:
   16  * 1. Redistributions of source code must retain the above copyright
   17  *    notice, this list of conditions and the following disclaimer.
   18  * 2. Redistributions in binary form must reproduce the above copyright
   19  *    notice, this list of conditions and the following disclaimer in the
   20  *    documentation and/or other materials provided with the distribution.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
   23  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   24  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   25  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
   26  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   27  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   28  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   29  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   30  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   31  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   32  * POSSIBILITY OF SUCH DAMAGE.
   33  */
   34 
   35 /*
   36  * Copyright (c) 1982, 1986, 1989, 1993
   37  *      The Regents of the University of California.  All rights reserved.
   38  * (c) UNIX System Laboratories, Inc.
   39  * All or some portions of this file are derived from material licensed
   40  * to the University of California by American Telephone and Telegraph
   41  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
   42  * the permission of UNIX System Laboratories, Inc.
   43  *
   44  * Redistribution and use in source and binary forms, with or without
   45  * modification, are permitted provided that the following conditions
   46  * are met:
   47  * 1. Redistributions of source code must retain the above copyright
   48  *    notice, this list of conditions and the following disclaimer.
   49  * 2. Redistributions in binary form must reproduce the above copyright
   50  *    notice, this list of conditions and the following disclaimer in the
   51  *    documentation and/or other materials provided with the distribution.
   52  * 3. Neither the name of the University nor the names of its contributors
   53  *    may be used to endorse or promote products derived from this software
   54  *    without specific prior written permission.
   55  *
   56  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   57  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   58  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   59  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   60  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   61  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   62  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   63  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   64  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   65  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   66  * SUCH DAMAGE.
   67  *
   68  *      @(#)buf.h       8.9 (Berkeley) 3/30/95
   69  */
   70 
   71 #if !defined(_KERNEL)
   72 #error not supposed to be exposed to userland.
   73 #endif
   74 
   75 struct bufq_strat;
   76 
   77 /*
   78  * Device driver buffer queue.
   79  */
   80 struct bufq_state {
   81         void (*bq_put)(struct bufq_state *, struct buf *);
   82         struct buf *(*bq_get)(struct bufq_state *, int);
   83         struct buf *(*bq_cancel)(struct bufq_state *, struct buf *);
   84         void (*bq_fini)(struct bufq_state *);
   85         void *bq_private;
   86         int bq_flags;                   /* Flags from bufq_alloc() */
   87         struct bufq_strat *bq_strat;
   88 };
   89 
   90 static __inline void *bufq_private(const struct bufq_state *) __unused;
   91 static __inline bool buf_inorder(const struct buf *, const struct buf *, int)
   92     __unused;
   93 
   94 #include <sys/null.h> /* for NULL */
   95 
   96 static __inline void *
   97 bufq_private(const struct bufq_state *bufq)
   98 {
   99 
  100         return bufq->bq_private;
  101 }
  102 
  103 /*
  104  * Check if two buf's are in ascending order.
  105  *
  106  * this function consider a NULL buf is after any non-NULL buf.
  107  *
  108  * this function returns false if two are "same".
  109  */
  110 static __inline bool
  111 buf_inorder(const struct buf *bp, const struct buf *bq, int sortby)
  112 {
  113 
  114         KASSERT(bp != NULL || bq != NULL);
  115         if (bp == NULL || bq == NULL)
  116                 return (bq == NULL);
  117 
  118         if (sortby == BUFQ_SORT_CYLINDER) {
  119                 if (bp->b_cylinder != bq->b_cylinder)
  120                         return bp->b_cylinder < bq->b_cylinder;
  121                 else
  122                         return bp->b_rawblkno < bq->b_rawblkno;
  123         } else
  124                 return bp->b_rawblkno < bq->b_rawblkno;
  125 }
  126 
  127 struct bufq_strat {
  128         const char *bs_name;
  129         void (*bs_initfn)(struct bufq_state *);
  130         int bs_prio;
  131         int bs_refcnt;
  132         SLIST_ENTRY(bufq_strat) bs_next;
  133 };
  134 
  135 #define BUFQ_DEFINE(name, prio, initfn)                 \
  136 static struct bufq_strat bufq_strat_##name = {          \
  137         .bs_name = #name,                               \
  138         .bs_prio = prio,                                \
  139         .bs_initfn = initfn,                            \
  140         .bs_refcnt = 0                                  \
  141 };
  142 
  143 int bufq_register(struct bufq_strat *);
  144 int bufq_unregister(struct bufq_strat *);

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