dm_target_mirror.c revision 1.5.2.2
1 1.5.2.2 yamt /*$NetBSD: dm_target_mirror.c,v 1.5.2.2 2009/05/04 08:12:36 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 1.5.2.2 yamt #ifdef DM_TARGET_MODULE 43 1.5.2.2 yamt /* 44 1.5.2.2 yamt * Every target can be compiled directly to dm driver or as a 45 1.5.2.2 yamt * separate module this part of target is used for loading targets 46 1.5.2.2 yamt * to dm driver. 47 1.5.2.2 yamt * Target can be unloaded from kernel only if there are no users of 48 1.5.2.2 yamt * it e.g. there are no devices which uses that target. 49 1.5.2.2 yamt */ 50 1.5.2.2 yamt #include <sys/kernel.h> 51 1.5.2.2 yamt #include <sys/module.h> 52 1.5.2.2 yamt 53 1.5.2.2 yamt MODULE(MODULE_CLASS_MISC, dm_target_mirror, "dm"); 54 1.5.2.2 yamt 55 1.5.2.2 yamt static int 56 1.5.2.2 yamt dm_target_mirror_modcmd(modcmd_t cmd, void *arg) 57 1.5.2.2 yamt { 58 1.5.2.2 yamt dm_target_t *dmt; 59 1.5.2.2 yamt int r; 60 1.5.2.2 yamt dmt = NULL; 61 1.5.2.2 yamt 62 1.5.2.2 yamt switch (cmd) { 63 1.5.2.2 yamt case MODULE_CMD_INIT: 64 1.5.2.2 yamt if ((dmt = dm_target_lookup("mirror")) != NULL){ 65 1.5.2.2 yamt dm_target_unbusy(dmt); 66 1.5.2.2 yamt return EEXIST; 67 1.5.2.2 yamt } 68 1.5.2.2 yamt dmt = dm_target_alloc("mirror"); 69 1.5.2.2 yamt 70 1.5.2.2 yamt dmt->version[0] = 1; 71 1.5.2.2 yamt dmt->version[1] = 0; 72 1.5.2.2 yamt dmt->version[2] = 0; 73 1.5.2.2 yamt strlcpy(dmt->name, "mirror", DM_MAX_TYPE_NAME); 74 1.5.2.2 yamt dmt->init = &dm_target_mirror_init; 75 1.5.2.2 yamt dmt->status = &dm_target_mirror_status; 76 1.5.2.2 yamt dmt->strategy = &dm_target_mirror_strategy; 77 1.5.2.2 yamt dmt->deps = &dm_target_mirror_deps; 78 1.5.2.2 yamt dmt->destroy = &dm_target_mirror_destroy; 79 1.5.2.2 yamt dmt->upcall = &dm_target_mirror_upcall; 80 1.5.2.2 yamt 81 1.5.2.2 yamt r = dm_target_insert(dmt); 82 1.5.2.2 yamt 83 1.5.2.2 yamt break; 84 1.5.2.2 yamt 85 1.5.2.2 yamt case MODULE_CMD_FINI: 86 1.5.2.2 yamt r = dm_target_rem("mirror"); 87 1.5.2.2 yamt break; 88 1.5.2.2 yamt 89 1.5.2.2 yamt case MODULE_CMD_STAT: 90 1.5.2.2 yamt return ENOTTY; 91 1.5.2.2 yamt 92 1.5.2.2 yamt default: 93 1.5.2.2 yamt return ENOTTY; 94 1.5.2.2 yamt } 95 1.5.2.2 yamt 96 1.5.2.2 yamt return r; 97 1.5.2.2 yamt } 98 1.5.2.2 yamt 99 1.5.2.2 yamt #endif 100 1.5.2.2 yamt 101 1.5.2.2 yamt /* 102 1.5.2.2 yamt * Init function called from dm_table_load_ioctl. 103 1.5.2.2 yamt * start length mirror log_type #logargs logarg1 ... logargN #devs device1 offset1 ... deviceN offsetN 104 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 0 105 1.5.2.2 yamt */ 106 1.5.2.2 yamt int 107 1.5.2.2 yamt dm_target_mirror_init(dm_dev_t *dmv, void **target_config, char *argv) 108 1.5.2.2 yamt { 109 1.5.2.2 yamt 110 1.5.2.2 yamt printf("Mirror target init function called!!\n"); 111 1.5.2.2 yamt 112 1.5.2.2 yamt *target_config = NULL; 113 1.5.2.2 yamt 114 1.5.2.2 yamt dmv->dev_type = DM_MIRROR_DEV; 115 1.5.2.2 yamt 116 1.5.2.2 yamt return ENOSYS; 117 1.5.2.2 yamt } 118 1.5.2.2 yamt 119 1.5.2.2 yamt /* Status routine called to get params string. */ 120 1.5.2.2 yamt char * 121 1.5.2.2 yamt dm_target_mirror_status(void *target_config) 122 1.5.2.2 yamt { 123 1.5.2.2 yamt return NULL; 124 1.5.2.2 yamt } 125 1.5.2.2 yamt 126 1.5.2.2 yamt /* Strategy routine called from dm_strategy. */ 127 1.5.2.2 yamt int 128 1.5.2.2 yamt dm_target_mirror_strategy(dm_table_entry_t *table_en, struct buf *bp) 129 1.5.2.2 yamt { 130 1.5.2.2 yamt 131 1.5.2.2 yamt printf("Mirror target read function called!!\n"); 132 1.5.2.2 yamt 133 1.5.2.2 yamt bp->b_error = EIO; 134 1.5.2.2 yamt bp->b_resid = 0; 135 1.5.2.2 yamt 136 1.5.2.2 yamt biodone(bp); 137 1.5.2.2 yamt 138 1.5.2.2 yamt return 0; 139 1.5.2.2 yamt } 140 1.5.2.2 yamt 141 1.5.2.2 yamt /* Doesn't do anything here. */ 142 1.5.2.2 yamt int 143 1.5.2.2 yamt dm_target_mirror_destroy(dm_table_entry_t *table_en) 144 1.5.2.2 yamt { 145 1.5.2.2 yamt table_en->target_config = NULL; 146 1.5.2.2 yamt 147 1.5.2.2 yamt /* Unbusy target so we can unload it */ 148 1.5.2.2 yamt dm_target_unbusy(table_en->target); 149 1.5.2.2 yamt 150 1.5.2.2 yamt return 0; 151 1.5.2.2 yamt } 152 1.5.2.2 yamt 153 1.5.2.2 yamt /* Doesn't not need to do anything here. */ 154 1.5.2.2 yamt int 155 1.5.2.2 yamt dm_target_mirror_deps(dm_table_entry_t *table_en, prop_array_t prop_array) 156 1.5.2.2 yamt { 157 1.5.2.2 yamt return 0; 158 1.5.2.2 yamt } 159 1.5.2.2 yamt 160 1.5.2.2 yamt /* Unsupported for this target. */ 161 1.5.2.2 yamt int 162 1.5.2.2 yamt dm_target_mirror_upcall(dm_table_entry_t *table_en, struct buf *bp) 163 1.5.2.2 yamt { 164 1.5.2.2 yamt return 0; 165 1.5.2.2 yamt } 166
Indexes created Thu Oct 02 01:09:59 GMT 2025