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 <dev/disk/dm/dm.h> 36 37 /* Init function called from dm_table_load_ioctl. */ 38 static int 39 dm_target_error_init(dm_table_entry_t *table_en, int argc, char **argv) 40 { 41 42 kprintf("Error target init function called!!\n"); 43 44 dm_table_init_target(table_en, DM_ERROR_DEV, NULL); 45 46 return 0; 47 } 48 49 /* Strategy routine called from dm_strategy. */ 50 static int 51 dm_target_error_strategy(dm_table_entry_t *table_en, struct buf *bp) 52 { 53 54 /* kprintf("Error target read function called!!\n"); */ 55 56 bp->b_error = EIO; 57 bp->b_resid = 0; 58 59 biodone(&bp->b_bio1); 60 61 return 0; 62 } 63 64 /* Doesn't do anything here. */ 65 static int 66 dm_target_error_destroy(dm_table_entry_t *table_en) 67 { 68 return 0; 69 } 70 71 static int 72 dmte_mod_handler(module_t mod, int type, void *unused) 73 { 74 dm_target_t *dmt = NULL; 75 int err = 0; 76 77 switch(type) { 78 case MOD_LOAD: 79 if ((dmt = dm_target_lookup("error")) != NULL) { 80 dm_target_unbusy(dmt); 81 return EEXIST; 82 } 83 dmt = dm_target_alloc("error"); 84 dmt->version[0] = 1; 85 dmt->version[1] = 0; 86 dmt->version[2] = 0; 87 dmt->init = &dm_target_error_init; 88 dmt->destroy = &dm_target_error_destroy; 89 dmt->strategy = &dm_target_error_strategy; 90 91 err = dm_target_insert(dmt); 92 if (err == 0) 93 kprintf("dm_target_error: Successfully initialized\n"); 94 break; 95 96 case MOD_UNLOAD: 97 err = dm_target_remove("error"); 98 if (err == 0) 99 kprintf("dm_target_error: unloaded\n"); 100 break; 101 102 default: 103 break; 104 } 105 106 return err; 107 } 108 109 DM_TARGET_BUILTIN(dm_target_error, dmte_mod_handler); 110