1 /*$NetBSD: dm_target_mirror.c,v 1.9 2010/05/18 15:10:38 haad Exp $*/ 2 3 /* 4 * Copyright (c) 2009 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 mirror target. 34 */ 35 #include <sys/types.h> 36 #include <sys/param.h> 37 38 #include <sys/buf.h> 39 40 #include "dm.h" 41 42 /* dm_target_mirror.c */ 43 int dm_target_mirror_init(dm_dev_t *, void**, char *); 44 char * dm_target_mirror_status(void *); 45 int dm_target_mirror_strategy(dm_table_entry_t *, struct buf *); 46 int dm_target_mirror_sync(dm_table_entry_t *); 47 int dm_target_mirror_deps(dm_table_entry_t *, prop_array_t); 48 int dm_target_mirror_destroy(dm_table_entry_t *); 49 int dm_target_mirror_upcall(dm_table_entry_t *, struct buf *); 50 51 #ifdef DM_TARGET_MODULE 52 /* 53 * Every target can be compiled directly to dm driver or as a 54 * separate module this part of target is used for loading targets 55 * to dm driver. 56 * Target can be unloaded from kernel only if there are no users of 57 * it e.g. there are no devices which uses that target. 58 */ 59 #include <sys/kernel.h> 60 #include <sys/module.h> 61 62 MODULE(MODULE_CLASS_MISC, dm_target_mirror, "dm"); 63 64 static int 65 dm_target_mirror_modcmd(modcmd_t cmd, void *arg) 66 { 67 dm_target_t *dmt; 68 int r; 69 dmt = NULL; 70 71 switch (cmd) { 72 case MODULE_CMD_INIT: 73 if ((dmt = dm_target_lookup("mirror")) != NULL) { 74 dm_target_unbusy(dmt); 75 return EEXIST; 76 } 77 dmt = dm_target_alloc("mirror"); 78 79 dmt->version[0] = 1; 80 dmt->version[1] = 0; 81 dmt->version[2] = 0; 82 strlcpy(dmt->name, "mirror", DM_MAX_TYPE_NAME); 83 dmt->init = &dm_target_mirror_init; 84 dmt->status = &dm_target_mirror_status; 85 dmt->strategy = &dm_target_mirror_strategy; 86 dmt->sync = &dm_target_mirror_sync; 87 dmt->deps = &dm_target_mirror_deps; 88 dmt->destroy = &dm_target_mirror_destroy; 89 dmt->upcall = &dm_target_mirror_upcall; 90 91 r = dm_target_insert(dmt); 92 93 break; 94 95 case MODULE_CMD_FINI: 96 r = dm_target_rem("mirror"); 97 break; 98 99 case MODULE_CMD_STAT: 100 return ENOTTY; 101 102 default: 103 return ENOTTY; 104 } 105 106 return r; 107 } 108 #endif 109 110 /* 111 * Init function called from dm_table_load_ioctl. 112 * start length mirror log_type #logargs logarg1 ... logargN #devs device1 offset1 ... deviceN offsetN 113 * 0 52428800 mirror clustered_disk 4 253:2 1024 UUID block_on_error 3 253:3 0 253:4 0 253:5 0 114 */ 115 int 116 dm_target_mirror_init(dm_dev_t * dmv, void **target_config, char *argv) 117 { 118 119 printf("Mirror target init function called!!\n"); 120 121 *target_config = NULL; 122 123 dmv->dev_type = DM_MIRROR_DEV; 124 125 return ENOSYS; 126 } 127 /* Status routine called to get params string. */ 128 char * 129 dm_target_mirror_status(void *target_config) 130 { 131 return NULL; 132 } 133 /* Strategy routine called from dm_strategy. */ 134 int 135 dm_target_mirror_strategy(dm_table_entry_t * table_en, struct buf * bp) 136 { 137 138 printf("Mirror target read function called!!\n"); 139 140 bp->b_error = EIO; 141 bp->b_resid = 0; 142 143 biodone(bp); 144 145 return 0; 146 } 147 /* Sync underlying disk caches. */ 148 int 149 dm_target_mirror_sync(dm_table_entry_t * table_en) 150 { 151 152 return 0; 153 } 154 /* Doesn't do anything here. */ 155 int 156 dm_target_mirror_destroy(dm_table_entry_t * table_en) 157 { 158 table_en->target_config = NULL; 159 160 /* Unbusy target so we can unload it */ 161 dm_target_unbusy(table_en->target); 162 163 return 0; 164 } 165 /* Doesn't not need to do anything here. */ 166 int 167 dm_target_mirror_deps(dm_table_entry_t * table_en, prop_array_t prop_array) 168 { 169 return 0; 170 } 171 /* Unsupported for this target. */ 172 int 173 dm_target_mirror_upcall(dm_table_entry_t * table_en, struct buf * bp) 174 { 175 return 0; 176 } 177