dm_target_mirror.c revision 1.5.2.5
1 1.5.2.5 yamt /*$NetBSD: dm_target_mirror.c,v 1.5.2.5 2010/08/11 22:53:21 yamt Exp $*/ 2 1.5.2.2 yamt 3 1.5.2.2 yamt /* 4 1.5.2.2 yamt * Copyright (c) 2009 The NetBSD Foundation, Inc. 5 1.5.2.2 yamt * All rights reserved. 6 1.5.2.2 yamt * 7 1.5.2.2 yamt * This code is derived from software contributed to The NetBSD Foundation 8 1.5.2.2 yamt * by Adam Hamsik. 9 1.5.2.2 yamt * 10 1.5.2.2 yamt * Redistribution and use in source and binary forms, with or without 11 1.5.2.2 yamt * modification, are permitted provided that the following conditions 12 1.5.2.2 yamt * are met: 13 1.5.2.2 yamt * 1. Redistributions of source code must retain the above copyright 14 1.5.2.2 yamt * notice, this list of conditions and the following disclaimer. 15 1.5.2.2 yamt * 2. Redistributions in binary form must reproduce the above copyright 16 1.5.2.2 yamt * notice, this list of conditions and the following disclaimer in the 17 1.5.2.2 yamt * documentation and/or other materials provided with the distribution. 18 1.5.2.2 yamt * 19 1.5.2.2 yamt * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 1.5.2.2 yamt * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 1.5.2.2 yamt * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 1.5.2.2 yamt * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 1.5.2.2 yamt * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 1.5.2.2 yamt * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 1.5.2.2 yamt * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 1.5.2.2 yamt * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 1.5.2.2 yamt * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 1.5.2.2 yamt * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 1.5.2.2 yamt * POSSIBILITY OF SUCH DAMAGE. 30 1.5.2.2 yamt */ 31 1.5.2.2 yamt 32 1.5.2.2 yamt /* 33 1.5.2.2 yamt * This file implements initial version of device-mapper mirror target. 34 1.5.2.2 yamt */ 35 1.5.2.2 yamt #include <sys/types.h> 36 1.5.2.2 yamt #include <sys/param.h> 37 1.5.2.2 yamt 38 1.5.2.2 yamt #include <sys/buf.h> 39 1.5.2.2 yamt 40 1.5.2.2 yamt #include "dm.h" 41 1.5.2.2 yamt 42 1.5.2.5 yamt /* dm_target_mirror.c */ 43 1.5.2.5 yamt int dm_target_mirror_init(dm_dev_t *, void**, char *); 44 1.5.2.5 yamt char * dm_target_mirror_status(void *); 45 1.5.2.5 yamt int dm_target_mirror_strategy(dm_table_entry_t *, struct buf *); 46 1.5.2.5 yamt int dm_target_mirror_sync(dm_table_entry_t *); 47 1.5.2.5 yamt int dm_target_mirror_deps(dm_table_entry_t *, prop_array_t); 48 1.5.2.5 yamt int dm_target_mirror_destroy(dm_table_entry_t *); 49 1.5.2.5 yamt int dm_target_mirror_upcall(dm_table_entry_t *, struct buf *); 50 1.5.2.5 yamt 51 1.5.2.2 yamt #ifdef DM_TARGET_MODULE 52 1.5.2.2 yamt /* 53 1.5.2.2 yamt * Every target can be compiled directly to dm driver or as a 54 1.5.2.2 yamt * separate module this part of target is used for loading targets 55 1.5.2.2 yamt * to dm driver. 56 1.5.2.2 yamt * Target can be unloaded from kernel only if there are no users of 57 1.5.2.2 yamt * it e.g. there are no devices which uses that target. 58 1.5.2.2 yamt */ 59 1.5.2.2 yamt #include <sys/kernel.h> 60 1.5.2.2 yamt #include <sys/module.h> 61 1.5.2.2 yamt 62 1.5.2.2 yamt MODULE(MODULE_CLASS_MISC, dm_target_mirror, "dm"); 63 1.5.2.2 yamt 64 1.5.2.2 yamt static int 65 1.5.2.2 yamt dm_target_mirror_modcmd(modcmd_t cmd, void *arg) 66 1.5.2.2 yamt { 67 1.5.2.2 yamt dm_target_t *dmt; 68 1.5.2.2 yamt int r; 69 1.5.2.2 yamt dmt = NULL; 70 1.5.2.4 yamt 71 1.5.2.2 yamt switch (cmd) { 72 1.5.2.2 yamt case MODULE_CMD_INIT: 73 1.5.2.4 yamt if ((dmt = dm_target_lookup("mirror")) != NULL) { 74 1.5.2.2 yamt dm_target_unbusy(dmt); 75 1.5.2.2 yamt return EEXIST; 76 1.5.2.2 yamt } 77 1.5.2.2 yamt dmt = dm_target_alloc("mirror"); 78 1.5.2.4 yamt 79 1.5.2.2 yamt dmt->version[0] = 1; 80 1.5.2.2 yamt dmt->version[1] = 0; 81 1.5.2.2 yamt dmt->version[2] = 0; 82 1.5.2.2 yamt strlcpy(dmt->name, "mirror", DM_MAX_TYPE_NAME); 83 1.5.2.2 yamt dmt->init = &dm_target_mirror_init; 84 1.5.2.2 yamt dmt->status = &dm_target_mirror_status; 85 1.5.2.2 yamt dmt->strategy = &dm_target_mirror_strategy; 86 1.5.2.5 yamt dmt->sync = &dm_target_mirror_sync; 87 1.5.2.2 yamt dmt->deps = &dm_target_mirror_deps; 88 1.5.2.2 yamt dmt->destroy = &dm_target_mirror_destroy; 89 1.5.2.2 yamt dmt->upcall = &dm_target_mirror_upcall; 90 1.5.2.2 yamt 91 1.5.2.2 yamt r = dm_target_insert(dmt); 92 1.5.2.4 yamt 93 1.5.2.2 yamt break; 94 1.5.2.2 yamt 95 1.5.2.2 yamt case MODULE_CMD_FINI: 96 1.5.2.2 yamt r = dm_target_rem("mirror"); 97 1.5.2.2 yamt break; 98 1.5.2.2 yamt 99 1.5.2.2 yamt case MODULE_CMD_STAT: 100 1.5.2.2 yamt return ENOTTY; 101 1.5.2.2 yamt 102 1.5.2.2 yamt default: 103 1.5.2.2 yamt return ENOTTY; 104 1.5.2.2 yamt } 105 1.5.2.2 yamt 106 1.5.2.2 yamt return r; 107 1.5.2.2 yamt } 108 1.5.2.2 yamt #endif 109 1.5.2.2 yamt 110 1.5.2.2 yamt /* 111 1.5.2.2 yamt * Init function called from dm_table_load_ioctl. 112 1.5.2.2 yamt * start length mirror log_type #logargs logarg1 ... logargN #devs device1 offset1 ... deviceN offsetN 113 1.5.2.2 yamt * 0 52428800 mirror clustered_disk 4 253:2 1024 UUID block_on_error 3 253:3 0 253:4 0 253:5 0 114 1.5.2.2 yamt */ 115 1.5.2.2 yamt int 116 1.5.2.4 yamt dm_target_mirror_init(dm_dev_t * dmv, void **target_config, char *argv) 117 1.5.2.2 yamt { 118 1.5.2.2 yamt 119 1.5.2.2 yamt printf("Mirror target init function called!!\n"); 120 1.5.2.2 yamt 121 1.5.2.2 yamt *target_config = NULL; 122 1.5.2.2 yamt 123 1.5.2.2 yamt dmv->dev_type = DM_MIRROR_DEV; 124 1.5.2.4 yamt 125 1.5.2.2 yamt return ENOSYS; 126 1.5.2.2 yamt } 127 1.5.2.2 yamt /* Status routine called to get params string. */ 128 1.5.2.2 yamt char * 129 1.5.2.2 yamt dm_target_mirror_status(void *target_config) 130 1.5.2.2 yamt { 131 1.5.2.2 yamt return NULL; 132 1.5.2.4 yamt } 133 1.5.2.2 yamt /* Strategy routine called from dm_strategy. */ 134 1.5.2.2 yamt int 135 1.5.2.4 yamt dm_target_mirror_strategy(dm_table_entry_t * table_en, struct buf * bp) 136 1.5.2.2 yamt { 137 1.5.2.2 yamt 138 1.5.2.2 yamt printf("Mirror target read function called!!\n"); 139 1.5.2.2 yamt 140 1.5.2.2 yamt bp->b_error = EIO; 141 1.5.2.2 yamt bp->b_resid = 0; 142 1.5.2.2 yamt 143 1.5.2.2 yamt biodone(bp); 144 1.5.2.4 yamt 145 1.5.2.2 yamt return 0; 146 1.5.2.2 yamt } 147 1.5.2.5 yamt /* Sync underlying disk caches. */ 148 1.5.2.5 yamt int 149 1.5.2.5 yamt dm_target_mirror_sync(dm_table_entry_t * table_en) 150 1.5.2.5 yamt { 151 1.5.2.5 yamt 152 1.5.2.5 yamt return 0; 153 1.5.2.5 yamt } 154 1.5.2.2 yamt /* Doesn't do anything here. */ 155 1.5.2.2 yamt int 156 1.5.2.4 yamt dm_target_mirror_destroy(dm_table_entry_t * table_en) 157 1.5.2.2 yamt { 158 1.5.2.2 yamt table_en->target_config = NULL; 159 1.5.2.2 yamt 160 1.5.2.2 yamt /* Unbusy target so we can unload it */ 161 1.5.2.2 yamt dm_target_unbusy(table_en->target); 162 1.5.2.4 yamt 163 1.5.2.2 yamt return 0; 164 1.5.2.2 yamt } 165 1.5.2.2 yamt /* Doesn't not need to do anything here. */ 166 1.5.2.2 yamt int 167 1.5.2.4 yamt dm_target_mirror_deps(dm_table_entry_t * table_en, prop_array_t prop_array) 168 1.5.2.4 yamt { 169 1.5.2.2 yamt return 0; 170 1.5.2.2 yamt } 171 1.5.2.2 yamt /* Unsupported for this target. */ 172 1.5.2.2 yamt int 173 1.5.2.4 yamt dm_target_mirror_upcall(dm_table_entry_t * table_en, struct buf * bp) 174 1.5.2.2 yamt { 175 1.5.2.2 yamt return 0; 176 1.5.2.2 yamt } 177
Indexes created Thu Oct 02 07:10:07 GMT 2025