Device layer rollup commit.
[dragonfly.git] / sys / kern / subr_xxx.c
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1/*
2 * Copyright (c) 1982, 1986, 1991, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * @(#)subr_xxx.c 8.1 (Berkeley) 6/10/93
34 * $FreeBSD: src/sys/kern/subr_xxx.c,v 1.15.2.1 2001/02/26 04:23:16 jlemon Exp $
e4c9c0c8 35 * $DragonFly: src/sys/kern/Attic/subr_xxx.c,v 1.4 2004/05/19 22:52:58 dillon Exp $
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36 */
37
38/*
39 * Miscellaneous trivial functions.
40 */
41#include <sys/param.h>
42#include <sys/systm.h>
e4c9c0c8 43#include <sys/buf.h>
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44
45/*
46 * Return error for operation not supported
47 * on a specific object or file type.
48 */
49int
e4c9c0c8 50eopnotsupp(void)
984263bc 51{
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52 return (EOPNOTSUPP);
53}
54
55/*
56 * Return error for an inval operation
57 * on a specific object or file type.
58 */
59int
e4c9c0c8 60einval(void)
984263bc 61{
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62 return (EINVAL);
63}
64
65/*
66 * Generic null operation, always returns success.
67 */
68int
e4c9c0c8 69nullop(void)
984263bc 70{
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71 return (0);
72}
73
74#include <sys/conf.h>
75
76/*
77 * Unsupported devswitch functions (e.g. for writing to read-only device).
78 * XXX may belong elsewhere.
79 */
80
81int
e4c9c0c8 82noclone(dev_t dev)
984263bc 83{
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84 /* take no action */
85 return (0); /* allow the clone */
86}
984263bc 87
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88int
89noopen(dev_t dev, int flags, int fmt, struct thread *td)
90{
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91 return (ENODEV);
92}
93
94int
e4c9c0c8 95noclose(dev_t dev, int flags, int fmt, struct thread *td)
984263bc 96{
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97 return (ENODEV);
98}
99
100int
e4c9c0c8 101noread(dev_t dev, struct uio *uio, int ioflag)
984263bc 102{
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103 return (ENODEV);
104}
105
106int
e4c9c0c8 107nowrite(dev_t dev, struct uio *uio, int ioflag)
984263bc 108{
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109 return (ENODEV);
110}
111
112int
e4c9c0c8 113noioctl(dev_t dev, u_long cmd, caddr_t data, int flags, struct thread *td)
984263bc 114{
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115 return (ENODEV);
116}
117
118int
e4c9c0c8 119nokqfilter(dev_t dev, struct knote *kn)
984263bc 120{
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121 return (ENODEV);
122}
123
124int
e4c9c0c8 125nommap(dev_t dev, vm_offset_t offset, int nprot)
984263bc 126{
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127 /* Don't return ENODEV. That would allow mapping address ENODEV! */
128 return (-1);
129}
130
131int
e4c9c0c8 132nopoll(dev_t dev, int events, d_thread_t *td)
984263bc 133{
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134 return(0);
135}
984263bc 136
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137void
138nostrategy(struct buf *bp)
139{
140 bp->b_flags |= B_ERROR;
141 bp->b_error = EOPNOTSUPP;
142 biodone(bp);
143}
144
145int
146nopsize(dev_t dev)
147{
148 return(0);
149}
150
151int
152nodump(dev_t dev, u_int count, u_int blkno, u_int secsize)
153{
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154 return (ENODEV);
155}
156
157/*
158 * Null devswitch functions (for when the operation always succeeds).
159 * XXX may belong elsewhere.
160 * XXX not all are here (e.g., seltrue() isn't).
161 */
162
163/*
164 * XXX this is probably bogus. Any device that uses it isn't checking the
165 * minor number.
166 */
167int
e4c9c0c8 168nullopen(dev_t dev, int flags, int fmt, struct thread *td)
984263bc 169{
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170 return (0);
171}
172
173int
e4c9c0c8 174nullclose(dev_t dev, int flags, int fmt, struct thread *td)
984263bc 175{
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176 return (0);
177}
e4c9c0c8 178