1 /* $NetBSD: bufq.h,v 1.10 2009/01/13 13:35:54 yamt Exp $ */ 2 /* NetBSD: buf.h,v 1.75 2004/09/18 16:40:11 yamt Exp */ 3 4 /*- 5 * Copyright (c) 1999, 2000 The NetBSD Foundation, Inc. 6 * All rights reserved. 7 * 8 * This code is derived from software contributed to The NetBSD Foundation 9 * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility, 10 * NASA Ames Research Center. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 23 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 24 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 25 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 26 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 27 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 30 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 31 * POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 /* 35 * Copyright (c) 1982, 1986, 1989, 1993 36 * The Regents of the University of California. All rights reserved. 37 * (c) UNIX System Laboratories, Inc. 38 * All or some portions of this file are derived from material licensed 39 * to the University of California by American Telephone and Telegraph 40 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 41 * the permission of UNIX System Laboratories, Inc. 42 * 43 * Redistribution and use in source and binary forms, with or without 44 * modification, are permitted provided that the following conditions 45 * are met: 46 * 1. Redistributions of source code must retain the above copyright 47 * notice, this list of conditions and the following disclaimer. 48 * 2. Redistributions in binary form must reproduce the above copyright 49 * notice, this list of conditions and the following disclaimer in the 50 * documentation and/or other materials provided with the distribution. 51 * 3. Neither the name of the University nor the names of its contributors 52 * may be used to endorse or promote products derived from this software 53 * without specific prior written permission. 54 * 55 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 56 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 57 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 58 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 59 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 60 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 61 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 62 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 63 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 64 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 65 * SUCH DAMAGE. 66 * 67 * @(#)buf.h 8.9 (Berkeley) 3/30/95 68 */ 69 70 #if !defined(_KERNEL) 71 #error not supposed to be exposed to userland. 72 #endif 73 74 struct buf; 75 struct bufq_state; 76 77 /* 78 * Special strategies for bufq_alloc. 79 */ 80 #define BUFQ_STRAT_ANY NULL /* let bufq_alloc select one. */ 81 #define BUFQ_DISK_DEFAULT_STRAT BUFQ_STRAT_ANY /* default for disks. */ 82 83 /* 84 * Flags for bufq_alloc. 85 */ 86 #define BUFQ_SORT_RAWBLOCK 0x0001 /* Sort by b_rawblkno */ 87 #define BUFQ_SORT_CYLINDER 0x0002 /* Sort by b_cylinder, b_rawblkno */ 88 89 #define BUFQ_SORT_MASK 0x000f 90 91 #define BUFQ_EXACT 0x0010 /* Don't fall back to other strategy */ 92 93 int bufq_alloc(struct bufq_state **, const char *, int); 94 void bufq_drain(struct bufq_state *); 95 void bufq_free(struct bufq_state *); 96 /* Put buffer in queue */ 97 void bufq_put(struct bufq_state *, struct buf *); 98 /* Get and remove buffer from queue */ 99 struct buf *bufq_get(struct bufq_state *); 100 /* Get buffer from queue */ 101 struct buf *bufq_peek(struct bufq_state *); 102 /* Remove specified buffer from queue */ 103 struct buf *bufq_cancel(struct bufq_state *, struct buf *); 104 const char *bufq_getstrategyname(struct bufq_state *); 105 void bufq_move(struct bufq_state *, struct bufq_state *); 106