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 37 #include <sys/buf.h> 38 39 #include <dev/disk/dm/dm.h> 40 41 /* Init function called from dm_table_load_ioctl. */ 42 static int 43 dm_target_error_init(dm_dev_t *dmv, void **target_config, char *argv) 44 { 45 46 kprintf("Error target init function called!!\n"); 47 48 *target_config = NULL; 49 50 dmv->dev_type = DM_ERROR_DEV; 51 52 return 0; 53 } 54 55 /* Table routine called to get params string. */ 56 static char * 57 dm_target_error_table(void *target_config) 58 { 59 return NULL; 60 } 61 62 /* Strategy routine called from dm_strategy. */ 63 static int 64 dm_target_error_strategy(dm_table_entry_t *table_en, struct buf *bp) 65 { 66 67 /* kprintf("Error target read function called!!\n"); */ 68 69 bp->b_error = EIO; 70 bp->b_resid = 0; 71 72 biodone(&bp->b_bio1); 73 74 return 0; 75 } 76 77 /* Doesn't do anything here. */ 78 static int 79 dm_target_error_destroy(dm_table_entry_t *table_en) 80 { 81 table_en->target_config = NULL; 82 83 return 0; 84 } 85 86 /* Doesn't not need to do anything here. */ 87 static int 88 dm_target_error_deps(dm_table_entry_t *table_en, prop_array_t prop_array) 89 { 90 return 0; 91 } 92 93 /* Unsupported for this target. */ 94 static int 95 dm_target_error_upcall(dm_table_entry_t *table_en, struct buf *bp) 96 { 97 return 0; 98 } 99 100 static int 101 dmte_mod_handler(module_t mod, int type, void *unused) 102 { 103 dm_target_t *dmt = NULL; 104 int err = 0; 105 106 switch(type) { 107 case MOD_LOAD: 108 if ((dmt = dm_target_lookup("error")) != NULL) { 109 dm_target_unbusy(dmt); 110 return EEXIST; 111 } 112 dmt = dm_target_alloc("error"); 113 dmt->version[0] = 1; 114 dmt->version[1] = 0; 115 dmt->version[2] = 0; 116 strlcpy(dmt->name, "error", DM_MAX_TYPE_NAME); 117 dmt->init = &dm_target_error_init; 118 dmt->table = &dm_target_error_table; 119 dmt->strategy = &dm_target_error_strategy; 120 dmt->deps = &dm_target_error_deps; 121 dmt->destroy = &dm_target_error_destroy; 122 dmt->upcall = &dm_target_error_upcall; 123 dmt->dump = NULL; 124 125 err = dm_target_insert(dmt); 126 if (err == 0) 127 kprintf("dm_target_error: Successfully initialized\n"); 128 break; 129 130 case MOD_UNLOAD: 131 err = dm_target_rem("error"); 132 if (err == 0) 133 kprintf("dm_target_error: unloaded\n"); 134 break; 135 136 default: 137 break; 138 } 139 140 return err; 141 } 142 143 DM_TARGET_BUILTIN(dm_target_error, dmte_mod_handler); 144