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 | |