| 1 | /* $NetBSD: bufq.h,v 1.11 2016/11/16 00:46:46 pgoyette 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 | void bufq_init(void); |
| 94 | int bufq_alloc(struct bufq_state **, const char *, int); |
| 95 | void bufq_drain(struct bufq_state *); |
| 96 | void bufq_free(struct bufq_state *); |
| 97 | /* Put buffer in queue */ |
| 98 | void bufq_put(struct bufq_state *, struct buf *); |
| 99 | /* Get and remove buffer from queue */ |
| 100 | struct buf *bufq_get(struct bufq_state *); |
| 101 | /* Get buffer from queue */ |
| 102 | struct buf *bufq_peek(struct bufq_state *); |
| 103 | /* Remove specified buffer from queue */ |
| 104 | struct buf *bufq_cancel(struct bufq_state *, struct buf *); |
| 105 | const char *bufq_getstrategyname(struct bufq_state *); |
| 106 | void bufq_move(struct bufq_state *, struct bufq_state *); |
| 107 | |