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 "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, "dm"); 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 dm_target_unbusy(dmt); 66 return EEXIST; 67 } 68 dmt = dm_target_alloc("error"); 69 70 dmt->version[0] = 1; 71 dmt->version[1] = 0; 72 dmt->version[2] = 0; 73 strlcpy(dmt->name, "error", DM_MAX_TYPE_NAME); 74 dmt->init = &dm_target_error_init; 75 dmt->status = &dm_target_error_status; 76 dmt->strategy = &dm_target_error_strategy; 77 dmt->deps = &dm_target_error_deps; 78 dmt->destroy = &dm_target_error_destroy; 79 dmt->upcall = &dm_target_error_upcall; 80 81 r = dm_target_insert(dmt); 82 83 break; 84 85 case MODULE_CMD_FINI: 86 r = dm_target_rem("error"); 87 break; 88 89 case MODULE_CMD_STAT: 90 return ENOTTY; 91 92 default: 93 return ENOTTY; 94 } 95 96 return r; 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 /* Status routine called to get params string. */ 114 char * 115 dm_target_error_status(void *target_config) 116 { 117 return NULL; 118 } 119 /* Strategy routine called from dm_strategy. */ 120 int 121 dm_target_error_strategy(dm_table_entry_t * table_en, struct buf * bp) 122 { 123 124 printf("Error target read function called!!\n"); 125 126 bp->b_error = EIO; 127 bp->b_resid = 0; 128 129 biodone(bp); 130 131 return 0; 132 } 133 /* Doesn't do anything here. */ 134 int 135 dm_target_error_destroy(dm_table_entry_t * table_en) 136 { 137 table_en->target_config = NULL; 138 139 /* Unbusy target so we can unload it */ 140 dm_target_unbusy(table_en->target); 141 142 return 0; 143 } 144 /* Doesn't not need to do anything here. */ 145 int 146 dm_target_error_deps(dm_table_entry_t * table_en, prop_array_t prop_array) 147 { 148 return 0; 149 } 150 /* Unsupported for this target. */ 151 int 152 dm_target_error_upcall(dm_table_entry_t * table_en, struct buf * bp) 153 { 154 return 0; 155 } 156