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 /* Unbusy target so we can unload it */ 85 dm_target_unbusy(table_en->target); 86 87 return 0; 88 } 89 90 /* Doesn't not need to do anything here. */ 91 static int 92 dm_target_error_deps(dm_table_entry_t * table_en, prop_array_t prop_array) 93 { 94 return 0; 95 } 96 97 /* Unsupported for this target. */ 98 static int 99 dm_target_error_upcall(dm_table_entry_t * table_en, struct buf * bp) 100 { 101 return 0; 102 } 103 104 static int 105 dmte_mod_handler(module_t mod, int type, void *unused) 106 { 107 dm_target_t *dmt = NULL; 108 int err = 0; 109 110 switch(type) { 111 case MOD_LOAD: 112 if ((dmt = dm_target_lookup("error")) != NULL) { 113 dm_target_unbusy(dmt); 114 return EEXIST; 115 } 116 dmt = dm_target_alloc("error"); 117 dmt->version[0] = 1; 118 dmt->version[1] = 0; 119 dmt->version[2] = 0; 120 strlcpy(dmt->name, "error", DM_MAX_TYPE_NAME); 121 dmt->init = &dm_target_error_init; 122 dmt->status = &dm_target_error_status; 123 dmt->strategy = &dm_target_error_strategy; 124 dmt->deps = &dm_target_error_deps; 125 dmt->destroy = &dm_target_error_destroy; 126 dmt->upcall = &dm_target_error_upcall; 127 dmt->dump = NULL; 128 129 err = dm_target_insert(dmt); 130 if (err == 0) 131 kprintf("dm_target_error: Successfully initialized\n"); 132 break; 133 134 case MOD_UNLOAD: 135 err = dm_target_rem("error"); 136 if (err == 0) 137 kprintf("dm_target_error: unloaded\n"); 138 break; 139 140 default: 141 break; 142 } 143 144 return err; 145 } 146 147 DM_TARGET_BUILTIN(dm_target_error, dmte_mod_handler); 148