1 /*$NetBSD: dm_target_mirror.c,v 1.11 2019/12/01 06:53:31 tkusumi Exp $*/ 2 3 /* 4 * Copyright (c) 2009 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Adam Hamsik. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 #include <sys/cdefs.h> 32 __KERNEL_RCSID(0, "$NetBSD: dm_target_mirror.c,v 1.11 2019/12/01 06:53:31 tkusumi Exp $"); 33 34 /* 35 * This file implements initial version of device-mapper mirror target. 36 */ 37 #include <sys/types.h> 38 #include <sys/param.h> 39 40 #include <sys/buf.h> 41 42 #include "dm.h" 43 44 /* dm_target_mirror.c */ 45 int dm_target_mirror_init(dm_dev_t *, void**, char *); 46 char * dm_target_mirror_status(void *); 47 int dm_target_mirror_strategy(dm_table_entry_t *, struct buf *); 48 int dm_target_mirror_sync(dm_table_entry_t *); 49 int dm_target_mirror_deps(dm_table_entry_t *, prop_array_t); 50 int dm_target_mirror_destroy(dm_table_entry_t *); 51 int dm_target_mirror_upcall(dm_table_entry_t *, struct buf *); 52 53 #ifdef DM_TARGET_MODULE 54 /* 55 * Every target can be compiled directly to dm driver or as a 56 * separate module this part of target is used for loading targets 57 * to dm driver. 58 * Target can be unloaded from kernel only if there are no users of 59 * it e.g. there are no devices which uses that target. 60 */ 61 #include <sys/kernel.h> 62 #include <sys/module.h> 63 64 MODULE(MODULE_CLASS_MISC, dm_target_mirror, "dm"); 65 66 static int 67 dm_target_mirror_modcmd(modcmd_t cmd, void *arg) 68 { 69 dm_target_t *dmt; 70 int r; 71 dmt = NULL; 72 73 switch (cmd) { 74 case MODULE_CMD_INIT: 75 if ((dmt = dm_target_lookup("mirror")) != NULL) { 76 dm_target_unbusy(dmt); 77 return EEXIST; 78 } 79 dmt = dm_target_alloc("mirror"); 80 81 dmt->version[0] = 1; 82 dmt->version[1] = 0; 83 dmt->version[2] = 0; 84 strlcpy(dmt->name, "mirror", DM_MAX_TYPE_NAME); 85 dmt->init = &dm_target_mirror_init; 86 dmt->status = &dm_target_mirror_status; 87 dmt->strategy = &dm_target_mirror_strategy; 88 dmt->sync = &dm_target_mirror_sync; 89 dmt->deps = &dm_target_mirror_deps; 90 dmt->destroy = &dm_target_mirror_destroy; 91 dmt->upcall = &dm_target_mirror_upcall; 92 93 r = dm_target_insert(dmt); 94 95 break; 96 97 case MODULE_CMD_FINI: 98 r = dm_target_rem("mirror"); 99 break; 100 101 case MODULE_CMD_STAT: 102 return ENOTTY; 103 104 default: 105 return ENOTTY; 106 } 107 108 return r; 109 } 110 #endif 111 112 /* 113 * Init function called from dm_table_load_ioctl. 114 * start length mirror log_type #logargs logarg1 ... logargN #devs device1 offset1 ... deviceN offsetN 115 * 0 52428800 mirror clustered_disk 4 253:2 1024 UUID block_on_error 3 253:3 0 253:4 0 253:5 0 116 */ 117 int 118 dm_target_mirror_init(dm_dev_t * dmv, void **target_config, char *argv) 119 { 120 121 printf("Mirror target init function called!!\n"); 122 123 *target_config = NULL; 124 125 return ENOSYS; 126 } 127 128 /* Status routine called to get params string. */ 129 char * 130 dm_target_mirror_status(void *target_config) 131 { 132 return NULL; 133 } 134 135 /* Strategy routine called from dm_strategy. */ 136 int 137 dm_target_mirror_strategy(dm_table_entry_t * table_en, struct buf * bp) 138 { 139 140 printf("Mirror target read function called!!\n"); 141 142 bp->b_error = EIO; 143 bp->b_resid = 0; 144 145 biodone(bp); 146 147 return 0; 148 } 149 150 /* Sync underlying disk caches. */ 151 int 152 dm_target_mirror_sync(dm_table_entry_t * table_en) 153 { 154 155 return 0; 156 } 157 158 /* Doesn't do anything here. */ 159 int 160 dm_target_mirror_destroy(dm_table_entry_t * table_en) 161 { 162 table_en->target_config = NULL; 163 164 /* Unbusy target so we can unload it */ 165 dm_target_unbusy(table_en->target); 166 167 return 0; 168 } 169 170 /* Doesn't not need to do anything here. */ 171 int 172 dm_target_mirror_deps(dm_table_entry_t * table_en, prop_array_t prop_array) 173 { 174 return 0; 175 } 176 177 /* Unsupported for this target. */ 178 int 179 dm_target_mirror_upcall(dm_table_entry_t * table_en, struct buf * bp) 180 { 181 return 0; 182 } 183