xref: /dragonfly/sys/dev/disk/dm/dm_target_error.c (revision 279dd846)
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 
40 #include <dev/disk/dm/dm.h>
41 
42 /* Init function called from dm_table_load_ioctl. */
43 static int
44 dm_target_error_init(dm_dev_t * dmv, void **target_config, char *argv)
45 {
46 
47 	kprintf("Error target init function called!!\n");
48 
49 	*target_config = NULL;
50 
51 	dmv->dev_type = DM_ERROR_DEV;
52 
53 	return 0;
54 }
55 
56 /* Status routine called to get params string. */
57 static char *
58 dm_target_error_status(void *target_config)
59 {
60 	return NULL;
61 }
62 
63 /* Strategy routine called from dm_strategy. */
64 static int
65 dm_target_error_strategy(dm_table_entry_t * table_en, struct buf * bp)
66 {
67 
68 	kprintf("Error target read function called!!\n");
69 
70 	bp->b_error = EIO;
71 	bp->b_resid = 0;
72 
73 	biodone(&bp->b_bio1);
74 
75 	return 0;
76 }
77 
78 /* Doesn't do anything here. */
79 static int
80 dm_target_error_destroy(dm_table_entry_t * table_en)
81 {
82 	table_en->target_config = NULL;
83 
84 	return 0;
85 }
86 
87 /* Doesn't not need to do anything here. */
88 static int
89 dm_target_error_deps(dm_table_entry_t * table_en, prop_array_t prop_array)
90 {
91 	return 0;
92 }
93 
94 /* Unsupported for this target. */
95 static int
96 dm_target_error_upcall(dm_table_entry_t * table_en, struct buf * bp)
97 {
98 	return 0;
99 }
100 
101 static int
102 dmte_mod_handler(module_t mod, int type, void *unused)
103 {
104 	dm_target_t *dmt = NULL;
105 	int err = 0;
106 
107 	switch(type) {
108 	case MOD_LOAD:
109 		if ((dmt = dm_target_lookup("error")) != NULL) {
110 			dm_target_unbusy(dmt);
111 			return EEXIST;
112 		}
113 		dmt = dm_target_alloc("error");
114 		dmt->version[0] = 1;
115 		dmt->version[1] = 0;
116 		dmt->version[2] = 0;
117 		strlcpy(dmt->name, "error", DM_MAX_TYPE_NAME);
118 		dmt->init = &dm_target_error_init;
119 		dmt->status = &dm_target_error_status;
120 		dmt->strategy = &dm_target_error_strategy;
121 		dmt->deps = &dm_target_error_deps;
122 		dmt->destroy = &dm_target_error_destroy;
123 		dmt->upcall = &dm_target_error_upcall;
124 		dmt->dump = NULL;
125 
126 		err = dm_target_insert(dmt);
127 		if (err == 0)
128 			kprintf("dm_target_error: Successfully initialized\n");
129 		break;
130 
131 	case MOD_UNLOAD:
132 		err = dm_target_rem("error");
133 		if (err == 0)
134 			kprintf("dm_target_error: unloaded\n");
135 		break;
136 
137 	default:
138 		break;
139 	}
140 
141 	return err;
142 }
143 
144 DM_TARGET_BUILTIN(dm_target_error, dmte_mod_handler);
145