140 lines
5.4 KiB
C
140 lines
5.4 KiB
C
/* $NetBSD: bufq_impl.h,v 1.5 2006/02/16 20:17:20 perry Exp $ */
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/* NetBSD: bufq.h,v 1.3 2005/03/31 11:28:53 yamt Exp */
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/* NetBSD: buf.h,v 1.75 2004/09/18 16:40:11 yamt Exp */
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/*-
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* Copyright (c) 1999, 2000 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
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* NASA Ames Research Center.
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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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Copyright (c) 1982, 1986, 1989, 1993
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* The Regents of the University of California. All rights reserved.
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* (c) UNIX System Laboratories, Inc.
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* All or some portions of this file are derived from material licensed
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* to the University of California by American Telephone and Telegraph
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* Co. or Unix System Laboratories, Inc. and are reproduced herein with
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* the permission of UNIX System Laboratories, Inc.
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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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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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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* @(#)buf.h 8.9 (Berkeley) 3/30/95
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*/
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#if !defined(_KERNEL)
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#error not supposed to be exposed to userland.
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#endif
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struct bufq_strat;
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/*
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* Device driver buffer queue.
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*/
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struct bufq_state {
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void (*bq_put)(struct bufq_state *, struct buf *);
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struct buf *(*bq_get)(struct bufq_state *, int);
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void *bq_private;
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int bq_flags; /* Flags from bufq_alloc() */
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const struct bufq_strat *bq_strat;
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};
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static __inline void *bufq_private(const struct bufq_state *) __unused;
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static __inline int buf_inorder(const struct buf *, const struct buf *, int)
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__unused;
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#include <sys/null.h> /* for NULL */
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static __inline void *
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bufq_private(const struct bufq_state *bufq)
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{
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return bufq->bq_private;
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}
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/*
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* Check if two buf's are in ascending order.
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*/
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static __inline int
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buf_inorder(const struct buf *bp, const struct buf *bq, int sortby)
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{
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if (bp == NULL || bq == NULL)
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return (bq == NULL);
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if (sortby == BUFQ_SORT_CYLINDER) {
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if (bp->b_cylinder != bq->b_cylinder)
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return bp->b_cylinder < bq->b_cylinder;
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else
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return bp->b_rawblkno < bq->b_rawblkno;
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} else
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return bp->b_rawblkno < bq->b_rawblkno;
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}
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struct bufq_strat {
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const char *bs_name;
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void (*bs_initfn)(struct bufq_state *);
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int bs_prio;
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};
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#define BUFQ_DEFINE(name, prio, initfn) \
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static const struct bufq_strat bufq_strat_##name = { \
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.bs_name = #name, \
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.bs_prio = prio, \
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.bs_initfn = initfn \
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}; \
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__link_set_add_rodata(bufq_strats, bufq_strat_##name)
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