dm_target_zero.c revision 1.7.2.2
1 1.7.2.2 yamt /* $NetBSD: dm_target_zero.c,v 1.7.2.2 2009/05/04 08:12:37 yamt Exp $ */ 2 1.7.2.2 yamt 3 1.7.2.2 yamt /* 4 1.7.2.2 yamt * Copyright (c) 2008 The NetBSD Foundation, Inc. 5 1.7.2.2 yamt * All rights reserved. 6 1.7.2.2 yamt * 7 1.7.2.2 yamt * This code is derived from software contributed to The NetBSD Foundation 8 1.7.2.2 yamt * by Adam Hamsik. 9 1.7.2.2 yamt * 10 1.7.2.2 yamt * Redistribution and use in source and binary forms, with or without 11 1.7.2.2 yamt * modification, are permitted provided that the following conditions 12 1.7.2.2 yamt * are met: 13 1.7.2.2 yamt * 1. Redistributions of source code must retain the above copyright 14 1.7.2.2 yamt * notice, this list of conditions and the following disclaimer. 15 1.7.2.2 yamt * 2. Redistributions in binary form must reproduce the above copyright 16 1.7.2.2 yamt * notice, this list of conditions and the following disclaimer in the 17 1.7.2.2 yamt * documentation and/or other materials provided with the distribution. 18 1.7.2.2 yamt * 19 1.7.2.2 yamt * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 1.7.2.2 yamt * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 1.7.2.2 yamt * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 1.7.2.2 yamt * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 1.7.2.2 yamt * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 1.7.2.2 yamt * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 1.7.2.2 yamt * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 1.7.2.2 yamt * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 1.7.2.2 yamt * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 1.7.2.2 yamt * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 1.7.2.2 yamt * POSSIBILITY OF SUCH DAMAGE. 30 1.7.2.2 yamt */ 31 1.7.2.2 yamt 32 1.7.2.2 yamt 33 1.7.2.2 yamt /* 34 1.7.2.2 yamt * This file implements initial version of device-mapper zero target. 35 1.7.2.2 yamt */ 36 1.7.2.2 yamt #include <sys/types.h> 37 1.7.2.2 yamt #include <sys/param.h> 38 1.7.2.2 yamt 39 1.7.2.2 yamt #include <sys/buf.h> 40 1.7.2.2 yamt 41 1.7.2.2 yamt #include "dm.h" 42 1.7.2.2 yamt 43 1.7.2.2 yamt #ifdef DM_TARGET_MODULE 44 1.7.2.2 yamt /* 45 1.7.2.2 yamt * Every target can be compiled directly to dm driver or as a 46 1.7.2.2 yamt * separate module this part of target is used for loading targets 47 1.7.2.2 yamt * to dm driver. 48 1.7.2.2 yamt * Target can be unloaded from kernel only if there are no users of 49 1.7.2.2 yamt * it e.g. there are no devices which uses that target. 50 1.7.2.2 yamt */ 51 1.7.2.2 yamt #include <sys/kernel.h> 52 1.7.2.2 yamt #include <sys/module.h> 53 1.7.2.2 yamt 54 1.7.2.2 yamt MODULE(MODULE_CLASS_MISC, dm_target_zero, "dm"); 55 1.7.2.2 yamt 56 1.7.2.2 yamt static int 57 1.7.2.2 yamt dm_target_zero_modcmd(modcmd_t cmd, void *arg) 58 1.7.2.2 yamt { 59 1.7.2.2 yamt dm_target_t *dmt; 60 1.7.2.2 yamt int r; 61 1.7.2.2 yamt dmt = NULL; 62 1.7.2.2 yamt 63 1.7.2.2 yamt switch (cmd) { 64 1.7.2.2 yamt case MODULE_CMD_INIT: 65 1.7.2.2 yamt if ((dmt = dm_target_lookup("zero")) != NULL){ 66 1.7.2.2 yamt dm_target_unbusy(dmt); 67 1.7.2.2 yamt return EEXIST; 68 1.7.2.2 yamt } 69 1.7.2.2 yamt dmt = dm_target_alloc("zero"); 70 1.7.2.2 yamt 71 1.7.2.2 yamt dmt->version[0] = 1; 72 1.7.2.2 yamt dmt->version[1] = 0; 73 1.7.2.2 yamt dmt->version[2] = 0; 74 1.7.2.2 yamt strlcpy(dmt->name, "zero", DM_MAX_TYPE_NAME); 75 1.7.2.2 yamt dmt->init = &dm_target_zero_init; 76 1.7.2.2 yamt dmt->status = &dm_target_zero_status; 77 1.7.2.2 yamt dmt->strategy = &dm_target_zero_strategy; 78 1.7.2.2 yamt dmt->deps = &dm_target_zero_deps; 79 1.7.2.2 yamt dmt->destroy = &dm_target_zero_destroy; 80 1.7.2.2 yamt dmt->upcall = &dm_target_zero_upcall; 81 1.7.2.2 yamt 82 1.7.2.2 yamt r = dm_target_insert(dmt); 83 1.7.2.2 yamt break; 84 1.7.2.2 yamt 85 1.7.2.2 yamt case MODULE_CMD_FINI: 86 1.7.2.2 yamt r = dm_target_rem("zero"); 87 1.7.2.2 yamt 88 1.7.2.2 yamt break; 89 1.7.2.2 yamt 90 1.7.2.2 yamt case MODULE_CMD_STAT: 91 1.7.2.2 yamt return ENOTTY; 92 1.7.2.2 yamt 93 1.7.2.2 yamt default: 94 1.7.2.2 yamt return ENOTTY; 95 1.7.2.2 yamt } 96 1.7.2.2 yamt 97 1.7.2.2 yamt return r; 98 1.7.2.2 yamt } 99 1.7.2.2 yamt 100 1.7.2.2 yamt #endif 101 1.7.2.2 yamt 102 1.7.2.2 yamt /* 103 1.7.2.2 yamt * Zero target init function. This target doesn't need 104 1.7.2.2 yamt * target specific config area. 105 1.7.2.2 yamt */ 106 1.7.2.2 yamt int 107 1.7.2.2 yamt dm_target_zero_init(dm_dev_t *dmv, void **target_config, char *argv) 108 1.7.2.2 yamt { 109 1.7.2.2 yamt 110 1.7.2.2 yamt printf("Zero target init function called!!\n"); 111 1.7.2.2 yamt 112 1.7.2.2 yamt dmv->dev_type = DM_ZERO_DEV; 113 1.7.2.2 yamt 114 1.7.2.2 yamt *target_config = NULL; 115 1.7.2.2 yamt 116 1.7.2.2 yamt return 0; 117 1.7.2.2 yamt } 118 1.7.2.2 yamt 119 1.7.2.2 yamt /* Status routine called to get params string. */ 120 1.7.2.2 yamt char * 121 1.7.2.2 yamt dm_target_zero_status(void *target_config) 122 1.7.2.2 yamt { 123 1.7.2.2 yamt return NULL; 124 1.7.2.2 yamt } 125 1.7.2.2 yamt 126 1.7.2.2 yamt 127 1.7.2.2 yamt /* 128 1.7.2.2 yamt * This routine does IO operations. 129 1.7.2.2 yamt */ 130 1.7.2.2 yamt int 131 1.7.2.2 yamt dm_target_zero_strategy(dm_table_entry_t *table_en, struct buf *bp) 132 1.7.2.2 yamt { 133 1.7.2.2 yamt 134 1.7.2.2 yamt /* printf("Zero target read function called %d!!\n", bp->b_bcount); */ 135 1.7.2.2 yamt 136 1.7.2.2 yamt memset(bp->b_data, 0, bp->b_bcount); 137 1.7.2.2 yamt bp->b_resid = 0; /* nestiobuf_done wants b_resid = 0 to be sure 138 1.7.2.2 yamt that there is no other io to done */ 139 1.7.2.2 yamt 140 1.7.2.2 yamt biodone(bp); 141 1.7.2.2 yamt 142 1.7.2.2 yamt return 0; 143 1.7.2.2 yamt } 144 1.7.2.2 yamt 145 1.7.2.2 yamt /* Doesn't not need to do anything here. */ 146 1.7.2.2 yamt int 147 1.7.2.2 yamt dm_target_zero_destroy(dm_table_entry_t *table_en) 148 1.7.2.2 yamt { 149 1.7.2.2 yamt table_en->target_config = NULL; 150 1.7.2.2 yamt 151 1.7.2.2 yamt /* Unbusy target so we can unload it */ 152 1.7.2.2 yamt dm_target_unbusy(table_en->target); 153 1.7.2.2 yamt 154 1.7.2.2 yamt return 0; 155 1.7.2.2 yamt } 156 1.7.2.2 yamt 157 1.7.2.2 yamt /* Doesn't not need to do anything here. */ 158 1.7.2.2 yamt int 159 1.7.2.2 yamt dm_target_zero_deps(dm_table_entry_t *table_en, prop_array_t prop_array) 160 1.7.2.2 yamt { 161 1.7.2.2 yamt return 0; 162 1.7.2.2 yamt } 163 1.7.2.2 yamt 164 1.7.2.2 yamt /* Unsuported for this target. */ 165 1.7.2.2 yamt int 166 1.7.2.2 yamt dm_target_zero_upcall(dm_table_entry_t *table_en, struct buf *bp) 167 1.7.2.2 yamt { 168 1.7.2.2 yamt return 0; 169 1.7.2.2 yamt } 170 1.7.2.2 yamt 171
Indexes created Mon Sep 29 21:09:56 GMT 2025