1 /* $NetBSD: dm_dev.c,v 1.8 2010/01/04 00:19:08 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 #include <sys/types.h> 33 #include <sys/param.h> 34 35 #include <sys/disk.h> 36 #include <sys/disklabel.h> 37 #include <sys/ioccom.h> 38 #include <sys/malloc.h> 39 40 #include "netbsd-dm.h" 41 #include "dm.h" 42 43 static dm_dev_t *dm_dev_lookup_name(const char *); 44 static dm_dev_t *dm_dev_lookup_uuid(const char *); 45 static dm_dev_t *dm_dev_lookup_minor(int); 46 47 MALLOC_DECLARE(M_DM); 48 49 static struct dm_dev_head dm_dev_list = 50 TAILQ_HEAD_INITIALIZER(dm_dev_list); 51 52 struct lock dm_dev_mutex; 53 54 /* dm_dev_mutex must be holdby caller before using disable_dev. */ 55 void 56 disable_dev(dm_dev_t * dmv) 57 { 58 TAILQ_REMOVE(&dm_dev_list, dmv, next_devlist); 59 lockmgr(&dmv->dev_mtx, LK_EXCLUSIVE); 60 lockmgr(&dm_dev_mutex, LK_RELEASE); 61 while (dmv->ref_cnt != 0) 62 cv_wait(&dmv->dev_cv, &dmv->dev_mtx); 63 lockmgr(&dmv->dev_mtx, LK_RELEASE); 64 } 65 /* 66 * Generic function used to lookup dm_dev_t. Calling with dm_dev_name 67 * and dm_dev_uuid NULL is allowed. 68 */ 69 dm_dev_t * 70 dm_dev_lookup(const char *dm_dev_name, const char *dm_dev_uuid, 71 int dm_dev_minor) 72 { 73 dm_dev_t *dmv; 74 75 dmv = NULL; 76 lockmgr(&dm_dev_mutex, LK_EXCLUSIVE); 77 78 /* KKASSERT(dm_dev_name != NULL && dm_dev_uuid != NULL && dm_dev_minor 79 * > 0); */ 80 if (dm_dev_minor > 0) 81 if ((dmv = dm_dev_lookup_minor(dm_dev_minor)) != NULL) { 82 dm_dev_busy(dmv); 83 lockmgr(&dm_dev_mutex, LK_RELEASE); 84 return dmv; 85 } 86 if (dm_dev_name != NULL) 87 if ((dmv = dm_dev_lookup_name(dm_dev_name)) != NULL) { 88 dm_dev_busy(dmv); 89 lockmgr(&dm_dev_mutex, LK_RELEASE); 90 return dmv; 91 } 92 if (dm_dev_uuid != NULL) 93 if ((dmv = dm_dev_lookup_uuid(dm_dev_uuid)) != NULL) { 94 dm_dev_busy(dmv); 95 lockmgr(&dm_dev_mutex, LK_RELEASE); 96 return dmv; 97 } 98 lockmgr(&dm_dev_mutex, LK_RELEASE); 99 return NULL; 100 } 101 102 103 /* 104 * Lookup device with its minor number. 105 */ 106 static dm_dev_t * 107 dm_dev_lookup_minor(int dm_dev_minor) 108 { 109 dm_dev_t *dmv; 110 111 TAILQ_FOREACH(dmv, &dm_dev_list, next_devlist) { 112 if (dm_dev_minor == dmv->minor) 113 return dmv; 114 } 115 116 return NULL; 117 } 118 /* 119 * Lookup device with it's device name. 120 */ 121 static dm_dev_t * 122 dm_dev_lookup_name(const char *dm_dev_name) 123 { 124 dm_dev_t *dmv; 125 int dlen; 126 int slen; 127 128 slen = strlen(dm_dev_name); 129 130 if (slen == 0) 131 return NULL; 132 133 TAILQ_FOREACH(dmv, &dm_dev_list, next_devlist) { 134 135 dlen = strlen(dmv->name); 136 137 if (slen != dlen) 138 continue; 139 140 if (strncmp(dm_dev_name, dmv->name, slen) == 0) 141 return dmv; 142 } 143 144 return NULL; 145 } 146 /* 147 * Lookup device with it's device uuid. Used mostly by LVM2tools. 148 */ 149 static dm_dev_t * 150 dm_dev_lookup_uuid(const char *dm_dev_uuid) 151 { 152 dm_dev_t *dmv; 153 size_t len; 154 155 len = 0; 156 len = strlen(dm_dev_uuid); 157 158 if (len == 0) 159 return NULL; 160 161 TAILQ_FOREACH(dmv, &dm_dev_list, next_devlist) { 162 163 if (strlen(dmv->uuid) != len) 164 continue; 165 166 if (strncmp(dm_dev_uuid, dmv->uuid, strlen(dmv->uuid)) == 0) 167 return dmv; 168 } 169 170 return NULL; 171 } 172 /* 173 * Insert new device to the global list of devices. 174 */ 175 int 176 dm_dev_insert(dm_dev_t * dev) 177 { 178 dm_dev_t *dmv; 179 int r; 180 181 dmv = NULL; 182 r = 0; 183 184 KKASSERT(dev != NULL); 185 lockmgr(&dm_dev_mutex, LK_EXCLUSIVE); 186 if (((dmv = dm_dev_lookup_uuid(dev->uuid)) == NULL) && 187 ((dmv = dm_dev_lookup_name(dev->name)) == NULL) && 188 ((dmv = dm_dev_lookup_minor(dev->minor)) == NULL)) { 189 190 TAILQ_INSERT_TAIL(&dm_dev_list, dev, next_devlist); 191 192 } else 193 r = EEXIST; 194 195 lockmgr(&dm_dev_mutex, LK_RELEASE); 196 return r; 197 } 198 #ifdef notyet 199 /* 200 * Lookup device with its minor number. 201 */ 202 int 203 dm_dev_test_minor(int dm_dev_minor) 204 { 205 dm_dev_t *dmv; 206 207 lockmgr(&dm_dev_mutex, LK_EXCLUSIVE); 208 TAILQ_FOREACH(dmv, &dm_dev_list, next_devlist) { 209 if (dm_dev_minor == dmv->minor) { 210 lockmgr(&dm_dev_mutex, LK_RELEASE); 211 return 1; 212 } 213 } 214 lockmgr(&dm_dev_mutex, LK_RELEASE); 215 216 return 0; 217 } 218 #endif 219 220 #if 0 221 /* 222 * dm_dev_lookup_devt look for selected device_t. We keep this routine 223 * outside of dm_dev_lookup because it is a temporally solution. 224 * 225 * TODO: This is a hack autoconf should be more flexible. 226 */ 227 dm_dev_t * 228 dm_dev_detach(device_t devt) 229 { 230 dm_dev_t *dmv; 231 232 lockmgr(&dm_dev_mutex, LK_EXCLUSIVE); 233 TAILQ_FOREACH(dmv, &dm_dev_list, next_devlist) { 234 if (devt == dmv->devt) { 235 disable_dev(dmv); 236 lockmgr(&dm_dev_mutex, LK_RELEASE); 237 return dmv; 238 } 239 } 240 lockmgr(&dm_dev_mutex, LK_RELEASE); 241 242 return NULL; 243 } 244 #endif 245 246 /* 247 * Remove device selected with dm_dev from global list of devices. 248 */ 249 dm_dev_t * 250 dm_dev_rem(const char *dm_dev_name, const char *dm_dev_uuid, 251 int dm_dev_minor) 252 { 253 dm_dev_t *dmv; 254 dmv = NULL; 255 256 lockmgr(&dm_dev_mutex, LK_EXCLUSIVE); 257 258 if (dm_dev_minor > 0) 259 if ((dmv = dm_dev_lookup_minor(dm_dev_minor)) != NULL) { 260 disable_dev(dmv); 261 return dmv; 262 } 263 if (dm_dev_name != NULL) 264 if ((dmv = dm_dev_lookup_name(dm_dev_name)) != NULL) { 265 disable_dev(dmv); 266 return dmv; 267 } 268 if (dm_dev_uuid != NULL) 269 if ((dmv = dm_dev_lookup_name(dm_dev_uuid)) != NULL) { 270 disable_dev(dmv); 271 return dmv; 272 } 273 lockmgr(&dm_dev_mutex, LK_RELEASE); 274 275 return NULL; 276 } 277 /* 278 * Destroy all devices created in device-mapper. Remove all tables 279 * free all allocated memmory. 280 */ 281 int 282 dm_dev_destroy(void) 283 { 284 dm_dev_t *dmv; 285 lockmgr(&dm_dev_mutex, LK_EXCLUSIVE); 286 287 while (TAILQ_FIRST(&dm_dev_list) != NULL) { 288 289 dmv = TAILQ_FIRST(&dm_dev_list); 290 291 TAILQ_REMOVE(&dm_dev_list, TAILQ_FIRST(&dm_dev_list), 292 next_devlist); 293 294 lockmgr(&dmv->dev_mtx, LK_EXCLUSIVE); 295 296 while (dmv->ref_cnt != 0) 297 cv_wait(&dmv->dev_cv, &dmv->dev_mtx); 298 299 /* Destroy active table first. */ 300 dm_table_destroy(&dmv->table_head, DM_TABLE_ACTIVE); 301 302 /* Destroy inactive table if exits, too. */ 303 dm_table_destroy(&dmv->table_head, DM_TABLE_INACTIVE); 304 305 dm_table_head_destroy(&dmv->table_head); 306 307 lockmgr(&dmv->dev_mtx, LK_RELEASE); 308 lockuninit(&dmv->dev_mtx); 309 cv_destroy(&dmv->dev_cv); 310 311 (void) kfree(dmv, M_DM); 312 } 313 lockmgr(&dm_dev_mutex, LK_RELEASE); 314 315 lockuninit(&dm_dev_mutex); 316 return 0; 317 } 318 /* 319 * Allocate new device entry. 320 */ 321 dm_dev_t * 322 dm_dev_alloc(void) 323 { 324 dm_dev_t *dmv; 325 326 dmv = kmalloc(sizeof(dm_dev_t), M_DM, M_WAITOK | M_ZERO); 327 328 if (dmv != NULL) 329 dmv->diskp = kmalloc(sizeof(struct disk), M_DM, M_WAITOK | M_ZERO); 330 331 return dmv; 332 } 333 /* 334 * Freed device entry. 335 */ 336 int 337 dm_dev_free(dm_dev_t * dmv) 338 { 339 KKASSERT(dmv != NULL); 340 341 lockuninit(&dmv->dev_mtx); 342 lockuninit(&dmv->diskp_mtx); 343 cv_destroy(&dmv->dev_cv); 344 345 if (dmv->diskp != NULL) 346 (void) kfree(dmv->diskp, M_DM); 347 348 (void) kfree(dmv, M_DM); 349 350 return 0; 351 } 352 353 void 354 dm_dev_busy(dm_dev_t * dmv) 355 { 356 lockmgr(&dmv->dev_mtx, LK_EXCLUSIVE); 357 dmv->ref_cnt++; 358 lockmgr(&dmv->dev_mtx, LK_RELEASE); 359 } 360 361 void 362 dm_dev_unbusy(dm_dev_t * dmv) 363 { 364 KKASSERT(dmv->ref_cnt != 0); 365 366 lockmgr(&dmv->dev_mtx, LK_EXCLUSIVE); 367 if (--dmv->ref_cnt == 0) 368 cv_broadcast(&dmv->dev_cv); 369 lockmgr(&dmv->dev_mtx, LK_RELEASE); 370 } 371 /* 372 * Return prop_array of dm_targer_list dictionaries. 373 */ 374 prop_array_t 375 dm_dev_prop_list(void) 376 { 377 dm_dev_t *dmv; 378 prop_array_t dev_array; 379 prop_dictionary_t dev_dict; 380 381 dev_array = prop_array_create(); 382 383 lockmgr(&dm_dev_mutex, LK_EXCLUSIVE); 384 385 TAILQ_FOREACH(dmv, &dm_dev_list, next_devlist) { 386 dev_dict = prop_dictionary_create(); 387 388 prop_dictionary_set_cstring(dev_dict, DM_DEV_NAME, dmv->name); 389 prop_dictionary_set_uint32(dev_dict, DM_DEV_DEV, dmv->minor); 390 391 prop_array_add(dev_array, dev_dict); 392 prop_object_release(dev_dict); 393 } 394 395 lockmgr(&dm_dev_mutex, LK_RELEASE); 396 return dev_array; 397 } 398 /* 399 * Initialize global device mutex. 400 */ 401 int 402 dm_dev_init(void) 403 { 404 TAILQ_INIT(&dm_dev_list); /* initialize global dev list */ 405 lockinit(&dm_dev_mutex, "dmdevlist", 0, LK_CANRECURSE); 406 return 0; 407 } 408