dm - undo my pointless moving of dm.h
[dragonfly.git] / sys / dev / disk / dm / dm_target_error.c
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1/* $NetBSD: dm_target_error.c,v 1.10 2010/01/04 00:12:22 haad Exp $ */
2
3/*
4 * Copyright (c) 2008 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Adam Hamsik.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32/*
33 * This file implements initial version of device-mapper error target.
34 */
35#include <sys/types.h>
36#include <sys/param.h>
37
38#include <sys/buf.h>
39
a84e173e 40#include <dev/disk/dm/dm.h>
ff56536e 41
ff56536e 42/* Init function called from dm_table_load_ioctl. */
5c411e8e 43static int
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44dm_target_error_init(dm_dev_t * dmv, void **target_config, char *argv)
45{
46
5b279a20 47 kprintf("Error target init function called!!\n");
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48
49 *target_config = NULL;
50
51 dmv->dev_type = DM_ERROR_DEV;
52
53 return 0;
54}
5c411e8e 55
ff56536e 56/* Status routine called to get params string. */
5c411e8e 57static char *
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58dm_target_error_status(void *target_config)
59{
60 return NULL;
61}
5c411e8e 62
ff56536e 63/* Strategy routine called from dm_strategy. */
5c411e8e 64static int
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65dm_target_error_strategy(dm_table_entry_t * table_en, struct buf * bp)
66{
67
5b279a20 68 kprintf("Error target read function called!!\n");
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69
70 bp->b_error = EIO;
71 bp->b_resid = 0;
72
5b279a20 73 biodone(&bp->b_bio1);
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74
75 return 0;
76}
5c411e8e 77
ff56536e 78/* Doesn't do anything here. */
5c411e8e 79static int
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80dm_target_error_destroy(dm_table_entry_t * table_en)
81{
82 table_en->target_config = NULL;
83
84 /* Unbusy target so we can unload it */
85 dm_target_unbusy(table_en->target);
86
87 return 0;
88}
5c411e8e 89
ff56536e 90/* Doesn't not need to do anything here. */
5c411e8e 91static int
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92dm_target_error_deps(dm_table_entry_t * table_en, prop_array_t prop_array)
93{
94 return 0;
95}
5c411e8e 96
ff56536e 97/* Unsupported for this target. */
5c411e8e 98static int
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99dm_target_error_upcall(dm_table_entry_t * table_en, struct buf * bp)
100{
101 return 0;
102}
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103
104static int
105dmte_mod_handler(module_t mod, int type, void *unused)
106{
107 dm_target_t *dmt = NULL;
108 int err = 0;
109
110 switch(type) {
111 case MOD_LOAD:
112 if ((dmt = dm_target_lookup("error")) != NULL) {
113 dm_target_unbusy(dmt);
114 return EEXIST;
115 }
116 dmt = dm_target_alloc("error");
117 dmt->version[0] = 1;
118 dmt->version[1] = 0;
119 dmt->version[2] = 0;
120 strlcpy(dmt->name, "error", DM_MAX_TYPE_NAME);
121 dmt->init = &dm_target_error_init;
122 dmt->status = &dm_target_error_status;
123 dmt->strategy = &dm_target_error_strategy;
124 dmt->deps = &dm_target_error_deps;
125 dmt->destroy = &dm_target_error_destroy;
126 dmt->upcall = &dm_target_error_upcall;
127 dmt->dump = NULL;
128
129 err = dm_target_insert(dmt);
130 if (err == 0)
131 kprintf("dm_target_error: Successfully initialized\n");
132 break;
133
134 case MOD_UNLOAD:
135 err = dm_target_rem("error");
136 if (err == 0)
137 kprintf("dm_target_error: unloaded\n");
138 break;
139
140 default:
141 break;
142 }
143
144 return err;
145}
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146
147DM_TARGET_BUILTIN(dm_target_error, dmte_mod_handler);