1 /* $NetBSD: dm_target_error.c,v 1.4 2008/12/21 00:59:39 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 "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_error, NULL); 54 55 static int 56 dm_target_error_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 ((dmt = dm_target_lookup("error")) != NULL) 65 return EEXIST; 66 67 dmt = dm_target_alloc("error"); 68 69 dmt->version[0] = 1; 70 dmt->version[1] = 0; 71 dmt->version[2] = 0; 72 strlcpy(dmt->name, "error", DM_MAX_TYPE_NAME); 73 dmt->init = &dm_target_error_init; 74 dmt->status = &dm_target_error_status; 75 dmt->strategy = &dm_target_error_strategy; 76 dmt->deps = &dm_target_error_deps; 77 dmt->destroy = &dm_target_error_destroy; 78 dmt->upcall = &dm_target_error_upcall; 79 80 r = dm_target_insert(dmt); 81 82 break; 83 84 case MODULE_CMD_FINI: 85 r = dm_target_rem("error"); 86 break; 87 88 case MODULE_CMD_STAT: 89 return ENOTTY; 90 91 default: 92 return ENOTTY; 93 } 94 95 return r; 96 } 97 98 #endif 99 100 /* Init function called from dm_table_load_ioctl. */ 101 int 102 dm_target_error_init(dm_dev_t *dmv, void **target_config, char *argv) 103 { 104 105 printf("Error target init function called!!\n"); 106 107 *target_config = NULL; 108 109 dmv->dev_type = DM_ERROR_DEV; 110 111 return 0; 112 } 113 114 /* Status routine called to get params string. */ 115 char * 116 dm_target_error_status(void *target_config) 117 { 118 return NULL; 119 } 120 121 /* Strategy routine called from dm_strategy. */ 122 int 123 dm_target_error_strategy(dm_table_entry_t *table_en, struct buf *bp) 124 { 125 126 printf("Error target read function called!!\n"); 127 128 bp->b_error = EIO; 129 bp->b_resid = 0; 130 131 biodone(bp); 132 133 return 0; 134 } 135 136 /* Doesn't do anything here. */ 137 int 138 dm_target_error_destroy(dm_table_entry_t *table_en) 139 { 140 table_en->target_config = NULL; 141 142 /* Unbusy target so we can unload it */ 143 dm_target_unbusy(table_en->target); 144 145 return 0; 146 } 147 148 /* Doesn't not need to do anything here. */ 149 int 150 dm_target_error_deps(dm_table_entry_t *table_en, prop_array_t prop_array) 151 { 152 return 0; 153 } 154 155 /* Unsupported for this target. */ 156 int 157 dm_target_error_upcall(dm_table_entry_t *table_en, struct buf *bp) 158 { 159 return 0; 160 } 161