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