1 /*$NetBSD: dm_target_mirror.c,v 1.2 2009/01/02 22:33:51 haad Exp $*/ 2 3 /* 4 * Copyright (c) 2009 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 mirror target. 34 */ 35 #include <sys/types.h> 36 #include <sys/param.h> 37 38 #include <sys/buf.h> 39 40 #include "dm.h" 41 42 #ifdef DM_TARGET_MODULE 43 /* 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 46 * to dm driver. 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. 49 */ 50 #include <sys/kernel.h> 51 #include <sys/module.h> 52 53 MODULE(MODULE_CLASS_MISC, dm_target_mirror, NULL); 54 55 static int 56 dm_target_mirror_modcmd(modcmd_t cmd, void *arg) 57 { 58 dm_target_t *dmt; 59 int r; 60 dmt = NULL; 61 62 switch (cmd) { 63 case MODULE_CMD_INIT: 64 if ((r = module_hold("dm")) != 0) 65 return r; 66 67 if ((dmt = dm_target_lookup("mirror")) != NULL) 68 return EEXIST; 69 70 dmt = dm_target_alloc("mirror"); 71 72 dmt->version[0] = 1; 73 dmt->version[1] = 0; 74 dmt->version[2] = 0; 75 strlcpy(dmt->name, "mirror", DM_MAX_TYPE_NAME); 76 dmt->init = &dm_target_mirror_init; 77 dmt->status = &dm_target_mirror_status; 78 dmt->strategy = &dm_target_mirror_strategy; 79 dmt->deps = &dm_target_mirror_deps; 80 dmt->destroy = &dm_target_mirror_destroy; 81 dmt->upcall = &dm_target_mirror_upcall; 82 83 r = dm_target_insert(dmt); 84 85 break; 86 87 case MODULE_CMD_FINI: 88 r = dm_target_rem("mirror"); 89 module_rele("dm"); /* release usage counter on dm module */ 90 break; 91 92 case MODULE_CMD_STAT: 93 return ENOTTY; 94 95 default: 96 return ENOTTY; 97 } 98 99 return r; 100 } 101 102 #endif 103 104 /* Init function called from dm_table_load_ioctl. */ 105 int 106 dm_target_mirror_init(dm_dev_t *dmv, void **target_config, char *argv) 107 { 108 109 printf("Mirror target init function called!!\n"); 110 111 *target_config = NULL; 112 113 dmv->dev_type = DM_MIRROR_DEV; 114 115 return ENOSYS; 116 } 117 118 /* Status routine called to get params string. */ 119 char * 120 dm_target_mirror_status(void *target_config) 121 { 122 return NULL; 123 } 124 125 /* Strategy routine called from dm_strategy. */ 126 int 127 dm_target_mirror_strategy(dm_table_entry_t *table_en, struct buf *bp) 128 { 129 130 printf("Mirror target read function called!!\n"); 131 132 bp->b_error = EIO; 133 bp->b_resid = 0; 134 135 biodone(bp); 136 137 return 0; 138 } 139 140 /* Doesn't do anything here. */ 141 int 142 dm_target_mirror_destroy(dm_table_entry_t *table_en) 143 { 144 table_en->target_config = NULL; 145 146 /* Unbusy target so we can unload it */ 147 dm_target_unbusy(table_en->target); 148 149 return 0; 150 } 151 152 /* Doesn't not need to do anything here. */ 153 int 154 dm_target_mirror_deps(dm_table_entry_t *table_en, prop_array_t prop_array) 155 { 156 return 0; 157 } 158 159 /* Unsupported for this target. */ 160 int 161 dm_target_mirror_upcall(dm_table_entry_t *table_en, struct buf *bp) 162 { 163 return 0; 164 } 165