dm_target_zero.c revision 1.6.2.2
1 1.6.2.2 mjf /* $NetBSD: dm_target_zero.c,v 1.6.2.2 2009/01/17 13:28:53 mjf Exp $ */ 2 1.6.2.2 mjf 3 1.6.2.2 mjf /* 4 1.6.2.2 mjf * Copyright (c) 2008 The NetBSD Foundation, Inc. 5 1.6.2.2 mjf * All rights reserved. 6 1.6.2.2 mjf * 7 1.6.2.2 mjf * This code is derived from software contributed to The NetBSD Foundation 8 1.6.2.2 mjf * by Adam Hamsik. 9 1.6.2.2 mjf * 10 1.6.2.2 mjf * Redistribution and use in source and binary forms, with or without 11 1.6.2.2 mjf * modification, are permitted provided that the following conditions 12 1.6.2.2 mjf * are met: 13 1.6.2.2 mjf * 1. Redistributions of source code must retain the above copyright 14 1.6.2.2 mjf * notice, this list of conditions and the following disclaimer. 15 1.6.2.2 mjf * 2. Redistributions in binary form must reproduce the above copyright 16 1.6.2.2 mjf * notice, this list of conditions and the following disclaimer in the 17 1.6.2.2 mjf * documentation and/or other materials provided with the distribution. 18 1.6.2.2 mjf * 19 1.6.2.2 mjf * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 1.6.2.2 mjf * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 1.6.2.2 mjf * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 1.6.2.2 mjf * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 1.6.2.2 mjf * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 1.6.2.2 mjf * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 1.6.2.2 mjf * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 1.6.2.2 mjf * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 1.6.2.2 mjf * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 1.6.2.2 mjf * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 1.6.2.2 mjf * POSSIBILITY OF SUCH DAMAGE. 30 1.6.2.2 mjf */ 31 1.6.2.2 mjf 32 1.6.2.2 mjf 33 1.6.2.2 mjf /* 34 1.6.2.2 mjf * This file implements initial version of device-mapper zero target. 35 1.6.2.2 mjf */ 36 1.6.2.2 mjf #include <sys/types.h> 37 1.6.2.2 mjf #include <sys/param.h> 38 1.6.2.2 mjf 39 1.6.2.2 mjf #include <sys/buf.h> 40 1.6.2.2 mjf 41 1.6.2.2 mjf #include "dm.h" 42 1.6.2.2 mjf 43 1.6.2.2 mjf #ifdef DM_TARGET_MODULE 44 1.6.2.2 mjf /* 45 1.6.2.2 mjf * Every target can be compiled directly to dm driver or as a 46 1.6.2.2 mjf * separate module this part of target is used for loading targets 47 1.6.2.2 mjf * to dm driver. 48 1.6.2.2 mjf * Target can be unloaded from kernel only if there are no users of 49 1.6.2.2 mjf * it e.g. there are no devices which uses that target. 50 1.6.2.2 mjf */ 51 1.6.2.2 mjf #include <sys/kernel.h> 52 1.6.2.2 mjf #include <sys/module.h> 53 1.6.2.2 mjf 54 1.6.2.2 mjf MODULE(MODULE_CLASS_MISC, dm_target_zero, "dm"); 55 1.6.2.2 mjf 56 1.6.2.2 mjf static int 57 1.6.2.2 mjf dm_target_zero_modcmd(modcmd_t cmd, void *arg) 58 1.6.2.2 mjf { 59 1.6.2.2 mjf dm_target_t *dmt; 60 1.6.2.2 mjf int r; 61 1.6.2.2 mjf dmt = NULL; 62 1.6.2.2 mjf 63 1.6.2.2 mjf switch (cmd) { 64 1.6.2.2 mjf case MODULE_CMD_INIT: 65 1.6.2.2 mjf if ((dmt = dm_target_lookup("zero")) != NULL) 66 1.6.2.2 mjf return EEXIST; 67 1.6.2.2 mjf 68 1.6.2.2 mjf dmt = dm_target_alloc("zero"); 69 1.6.2.2 mjf 70 1.6.2.2 mjf dmt->version[0] = 1; 71 1.6.2.2 mjf dmt->version[1] = 0; 72 1.6.2.2 mjf dmt->version[2] = 0; 73 1.6.2.2 mjf strlcpy(dmt->name, "zero", DM_MAX_TYPE_NAME); 74 1.6.2.2 mjf dmt->init = &dm_target_zero_init; 75 1.6.2.2 mjf dmt->status = &dm_target_zero_status; 76 1.6.2.2 mjf dmt->strategy = &dm_target_zero_strategy; 77 1.6.2.2 mjf dmt->deps = &dm_target_zero_deps; 78 1.6.2.2 mjf dmt->destroy = &dm_target_zero_destroy; 79 1.6.2.2 mjf dmt->upcall = &dm_target_zero_upcall; 80 1.6.2.2 mjf 81 1.6.2.2 mjf r = dm_target_insert(dmt); 82 1.6.2.2 mjf break; 83 1.6.2.2 mjf 84 1.6.2.2 mjf case MODULE_CMD_FINI: 85 1.6.2.2 mjf r = dm_target_rem("zero"); 86 1.6.2.2 mjf 87 1.6.2.2 mjf break; 88 1.6.2.2 mjf 89 1.6.2.2 mjf case MODULE_CMD_STAT: 90 1.6.2.2 mjf return ENOTTY; 91 1.6.2.2 mjf 92 1.6.2.2 mjf default: 93 1.6.2.2 mjf return ENOTTY; 94 1.6.2.2 mjf } 95 1.6.2.2 mjf 96 1.6.2.2 mjf return r; 97 1.6.2.2 mjf } 98 1.6.2.2 mjf 99 1.6.2.2 mjf #endif 100 1.6.2.2 mjf 101 1.6.2.2 mjf /* 102 1.6.2.2 mjf * Zero target init function. This target doesn't need 103 1.6.2.2 mjf * target specific config area. 104 1.6.2.2 mjf */ 105 1.6.2.2 mjf int 106 1.6.2.2 mjf dm_target_zero_init(dm_dev_t *dmv, void **target_config, char *argv) 107 1.6.2.2 mjf { 108 1.6.2.2 mjf 109 1.6.2.2 mjf printf("Zero target init function called!!\n"); 110 1.6.2.2 mjf 111 1.6.2.2 mjf dmv->dev_type = DM_ZERO_DEV; 112 1.6.2.2 mjf 113 1.6.2.2 mjf *target_config = NULL; 114 1.6.2.2 mjf 115 1.6.2.2 mjf return 0; 116 1.6.2.2 mjf } 117 1.6.2.2 mjf 118 1.6.2.2 mjf /* Status routine called to get params string. */ 119 1.6.2.2 mjf char * 120 1.6.2.2 mjf dm_target_zero_status(void *target_config) 121 1.6.2.2 mjf { 122 1.6.2.2 mjf return NULL; 123 1.6.2.2 mjf } 124 1.6.2.2 mjf 125 1.6.2.2 mjf 126 1.6.2.2 mjf /* 127 1.6.2.2 mjf * This routine does IO operations. 128 1.6.2.2 mjf */ 129 1.6.2.2 mjf int 130 1.6.2.2 mjf dm_target_zero_strategy(dm_table_entry_t *table_en, struct buf *bp) 131 1.6.2.2 mjf { 132 1.6.2.2 mjf 133 1.6.2.2 mjf /* printf("Zero target read function called %d!!\n", bp->b_bcount); */ 134 1.6.2.2 mjf 135 1.6.2.2 mjf memset(bp->b_data, 0, bp->b_bcount); 136 1.6.2.2 mjf bp->b_resid = 0; /* nestiobuf_done wants b_resid = 0 to be sure 137 1.6.2.2 mjf that there is no other io to done */ 138 1.6.2.2 mjf 139 1.6.2.2 mjf biodone(bp); 140 1.6.2.2 mjf 141 1.6.2.2 mjf return 0; 142 1.6.2.2 mjf } 143 1.6.2.2 mjf 144 1.6.2.2 mjf /* Doesn't not need to do anything here. */ 145 1.6.2.2 mjf int 146 1.6.2.2 mjf dm_target_zero_destroy(dm_table_entry_t *table_en) 147 1.6.2.2 mjf { 148 1.6.2.2 mjf table_en->target_config = NULL; 149 1.6.2.2 mjf 150 1.6.2.2 mjf /* Unbusy target so we can unload it */ 151 1.6.2.2 mjf dm_target_unbusy(table_en->target); 152 1.6.2.2 mjf 153 1.6.2.2 mjf return 0; 154 1.6.2.2 mjf } 155 1.6.2.2 mjf 156 1.6.2.2 mjf /* Doesn't not need to do anything here. */ 157 1.6.2.2 mjf int 158 1.6.2.2 mjf dm_target_zero_deps(dm_table_entry_t *table_en, prop_array_t prop_array) 159 1.6.2.2 mjf { 160 1.6.2.2 mjf return 0; 161 1.6.2.2 mjf } 162 1.6.2.2 mjf 163 1.6.2.2 mjf /* Unsuported for this target. */ 164 1.6.2.2 mjf int 165 1.6.2.2 mjf dm_target_zero_upcall(dm_table_entry_t *table_en, struct buf *bp) 166 1.6.2.2 mjf { 167 1.6.2.2 mjf return 0; 168 1.6.2.2 mjf } 169 1.6.2.2 mjf 170
Indexes created Mon Sep 29 21:09:56 GMT 2025