1 /* $NetBSD: dm_target_linear.c,v 1.5 2009/06/05 19:56:40 haad Exp $ */ 2 3 /* 4 * Copyright (c) 2008 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 32 33 /* 34 * This file implements initial version of device-mapper dklinear target. 35 */ 36 37 #include <sys/types.h> 38 #include <sys/param.h> 39 40 #include <sys/buf.h> 41 #include <sys/kmem.h> 42 #include <sys/vnode.h> 43 44 #include <machine/int_fmtio.h> 45 46 #include "netbsd-dm.h" 47 #include "dm.h" 48 49 /* 50 * Allocate target specific config data, and link them to table. 51 * This function is called only when, flags is not READONLY and 52 * therefore we can add things to pdev list. This should not a 53 * problem because this routine is called onyl from dm_table_load_ioctl. 54 * @argv[0] is name, 55 * @argv[1] is physical data offset. 56 */ 57 int 58 dm_target_linear_init(dm_dev_t *dmv, void **target_config, prop_dictionary_t dict) 59 { 60 dm_target_linear_config_t *tlc; 61 dm_pdev_t *dmp; 62 63 const char *device; 64 uint64_t offset; 65 66 if (prop_dictionary_get_cstring_nocopy(dict, DM_TARGET_LINEAR_DEVICE, 67 &device) == false) 68 return EINVAL; 69 70 if (prop_dictionary_get_uint64(dict, DM_TARGET_LINEAR_OFFSET, 71 &offset) == false) 72 return EINVAL; 73 74 /* Insert dmp to global pdev list */ 75 if ((dmp = dm_pdev_insert(device)) == NULL) 76 return ENOENT; 77 78 aprint_debug("Linear target init function called %s--%"PRIu64"!!\n", 79 device, offset); 80 81 if ((tlc = kmem_alloc(sizeof(dm_target_linear_config_t), KM_NOSLEEP)) 82 == NULL) 83 return 1; 84 85 tlc->pdev = dmp; 86 tlc->offset = 0; /* default settings */ 87 88 /* Check user input if it is not leave offset as 0. */ 89 tlc->offset = offset; 90 91 *target_config = tlc; 92 93 dmv->dev_type = DM_LINEAR_DEV; 94 95 return 0; 96 } 97 98 /* 99 * Status routine is called to get params string, which is target 100 * specific. When dm_table_status_ioctl is called with flag 101 * DM_STATUS_TABLE_FLAG I have to sent params string back. 102 */ 103 char * 104 dm_target_linear_status(void *target_config) 105 { 106 dm_target_linear_config_t *tlc; 107 char *params; 108 tlc = target_config; 109 110 aprint_debug("Linear target status function called\n"); 111 112 if ((params = kmem_alloc(DM_MAX_PARAMS_SIZE, KM_NOSLEEP)) == NULL) 113 return NULL; 114 115 aprint_normal("%s %"PRIu64, tlc->pdev->name, tlc->offset); 116 snprintf(params, DM_MAX_PARAMS_SIZE,"%s %"PRIu64, 117 tlc->pdev->name, tlc->offset); 118 119 return params; 120 } 121 122 /* 123 * Do IO operation, called from dmstrategy routine. 124 */ 125 int 126 dm_target_linear_strategy(dm_table_entry_t *table_en, struct buf *bp) 127 { 128 dm_target_linear_config_t *tlc; 129 130 tlc = table_en->target_config; 131 132 /* printf("Linear target read function called %" PRIu64 "!!\n", 133 tlc->offset);*/ 134 135 bp->b_blkno += tlc->offset; 136 137 VOP_STRATEGY(tlc->pdev->pdev_vnode, bp); 138 139 return 0; 140 141 } 142 143 /* 144 * Destroy target specific data. Decrement table pdevs. 145 */ 146 int 147 dm_target_linear_destroy(dm_table_entry_t *table_en) 148 { 149 dm_target_linear_config_t *tlc; 150 151 /* 152 * Destroy function is called for every target even if it 153 * doesn't have target_config. 154 */ 155 156 if (table_en->target_config == NULL) 157 return 0; 158 159 tlc = table_en->target_config; 160 161 /* Decrement pdev ref counter if 0 remove it */ 162 dm_pdev_decr(tlc->pdev); 163 164 /* Unbusy target so we can unload it */ 165 dm_target_unbusy(table_en->target); 166 167 kmem_free(table_en->target_config, sizeof(dm_target_linear_config_t)); 168 169 table_en->target_config = NULL; 170 171 return 0; 172 } 173 174 /* Add this target pdev dependiences to prop_array_t */ 175 int 176 dm_target_linear_deps(dm_table_entry_t *table_en, prop_array_t prop_array) 177 { 178 dm_target_linear_config_t *tlc; 179 struct vattr va; 180 181 int error; 182 183 if (table_en->target_config == NULL) 184 return ENOENT; 185 186 tlc = table_en->target_config; 187 188 if ((error = VOP_GETATTR(tlc->pdev->pdev_vnode, &va, curlwp->l_cred)) != 0) 189 return error; 190 191 prop_array_add_uint64(prop_array, (uint64_t)va.va_rdev); 192 193 return 0; 194 } 195 196 /* 197 * Register upcall device. 198 * Linear target doesn't need any upcall devices but other targets like 199 * mirror, snapshot, multipath, stripe will use this functionality. 200 */ 201 int 202 dm_target_linear_upcall(dm_table_entry_t *table_en, struct buf *bp) 203 { 204 return 0; 205 } 206 207 /* 208 * Transform char s to uint64_t offset number. 209 */ 210 uint64_t 211 atoi(const char *s) 212 { 213 uint64_t n; 214 n = 0; 215 216 while (*s != '\0') { 217 if (!isdigit(*s)) 218 break; 219 220 n = (10 * n) + (*s - '0'); 221 s++; 222 } 223 224 return n; 225 } 226