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 /* Strategy routine called from dm_strategy. */ 38 static int 39 dm_target_error_strategy(dm_table_entry_t *table_en, struct buf *bp) 40 { 41 bp->b_error = EIO; 42 bp->b_resid = 0; 43 44 biodone(&bp->b_bio1); 45 46 return 0; 47 } 48 49 static int 50 dmte_mod_handler(module_t mod, int type, void *unused) 51 { 52 dm_target_t *dmt = NULL; 53 int err = 0; 54 55 switch(type) { 56 case MOD_LOAD: 57 if ((dmt = dm_target_lookup("error")) != NULL) { 58 dm_target_unbusy(dmt); 59 return EEXIST; 60 } 61 dmt = dm_target_alloc("error"); 62 dmt->version[0] = 1; 63 dmt->version[1] = 0; 64 dmt->version[2] = 0; 65 dmt->strategy = &dm_target_error_strategy; 66 67 err = dm_target_insert(dmt); 68 if (err == 0) 69 kprintf("dm_target_error: Successfully initialized\n"); 70 break; 71 72 case MOD_UNLOAD: 73 err = dm_target_remove("error"); 74 if (err == 0) 75 kprintf("dm_target_error: unloaded\n"); 76 break; 77 } 78 79 return err; 80 } 81 82 DM_TARGET_BUILTIN(dm_target_error, dmte_mod_handler); 83