1 /*$NetBSD: dm_target_mirror.c,v 1.8 2010/01/04 00:12:22 haad Exp $*/
4 * Copyright (c) 2009 The NetBSD Foundation, Inc.
7 * This code is derived from software contributed to The NetBSD Foundation
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
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.
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.
33 * This file implements initial version of device-mapper mirror target.
35 #include <sys/types.h>
36 #include <sys/param.h>
42 #ifdef DM_TARGET_MODULE
44 * Every target can be compiled directly to dm driver or as a
45 * separate module this part of target is used for loading targets
47 * Target can be unloaded from kernel only if there are no users of
48 * it e.g. there are no devices which uses that target.
50 #include <sys/kernel.h>
51 #include <sys/module.h>
53 MODULE(MODULE_CLASS_MISC, dm_target_mirror, "dm");
56 dm_target_mirror_modcmd(modcmd_t cmd, void *arg)
64 if ((dmt = dm_target_lookup("mirror")) != NULL) {
65 dm_target_unbusy(dmt);
68 dmt = dm_target_alloc("mirror");
73 strlcpy(dmt->name, "mirror", DM_MAX_TYPE_NAME);
74 dmt->init = &dm_target_mirror_init;
75 dmt->status = &dm_target_mirror_status;
76 dmt->strategy = &dm_target_mirror_strategy;
77 dmt->deps = &dm_target_mirror_deps;
78 dmt->destroy = &dm_target_mirror_destroy;
79 dmt->upcall = &dm_target_mirror_upcall;
81 r = dm_target_insert(dmt);
86 r = dm_target_rem("mirror");
101 * Init function called from dm_table_load_ioctl.
102 * start length mirror log_type #logargs logarg1 ... logargN #devs device1 offset1 ... deviceN offsetN
103 * 0 52428800 mirror clustered_disk 4 253:2 1024 UUID block_on_error 3 253:3 0 253:4 0 253:5 0
106 dm_target_mirror_init(dm_dev_t * dmv, void **target_config, char *argv)
109 printf("Mirror target init function called!!\n");
111 *target_config = NULL;
113 dmv->dev_type = DM_MIRROR_DEV;
117 /* Status routine called to get params string. */
119 dm_target_mirror_status(void *target_config)
123 /* Strategy routine called from dm_strategy. */
125 dm_target_mirror_strategy(dm_table_entry_t * table_en, struct buf * bp)
128 printf("Mirror target read function called!!\n");
137 /* Doesn't do anything here. */
139 dm_target_mirror_destroy(dm_table_entry_t * table_en)
141 table_en->target_config = NULL;
143 /* Unbusy target so we can unload it */
144 dm_target_unbusy(table_en->target);
148 /* Doesn't not need to do anything here. */
150 dm_target_mirror_deps(dm_table_entry_t * table_en, prop_array_t prop_array)
154 /* Unsupported for this target. */
156 dm_target_mirror_upcall(dm_table_entry_t * table_en, struct buf * bp)