1 /* $NetBSD: dm_ioctl.c,v 1.21 2010/02/25 20:48:58 jakllsch 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 * Locking is used to synchronise between ioctl calls and between dm_table's 34 * users. 35 * 36 * ioctl locking: 37 * Simple reference counting, to count users of device will be used routines 38 * dm_dev_busy/dm_dev_unbusy are used for that. 39 * dm_dev_lookup/dm_dev_rem call dm_dev_busy before return(caller is therefore 40 * holder of reference_counter last). 41 * 42 * ioctl routines which change/remove dm_dev parameters must wait on 43 * dm_dev::dev_cv and when last user will call dm_dev_unbusy they will wake 44 * up them. 45 * 46 * table_head locking: 47 * To access table entries dm_table_* routines must be used. 48 * 49 * dm_table_get_entry will increment table users reference 50 * counter. It will return active or inactive table depends 51 * on uint8_t argument. 52 * 53 * dm_table_release must be called for every table_entry from 54 * dm_table_get_entry. Between these to calls tables can'tbe switched 55 * or destroyed. 56 * 57 * dm_table_head_init initialize talbe_entries SLISTS and io_cv. 58 * 59 * dm_table_head_destroy destroy cv. 60 * 61 * There are two types of users for dm_table_head first type will 62 * only read list and try to do anything with it e.g. dmstrategy, 63 * dm_table_size etc. There is another user for table_head which wants 64 * to change table lists e.g. dm_dev_resume_ioctl, dm_dev_remove_ioctl, 65 * dm_table_clear_ioctl. 66 * 67 * NOTE: It is not allowed to call dm_table_destroy, dm_table_switch_tables 68 * with hold table reference counter. Table reference counter is hold 69 * after calling dm_table_get_entry routine. After calling this 70 * function user must call dm_table_release before any writer table 71 * operation. 72 * 73 * Example: dm_table_get_entry 74 * dm_table_destroy/dm_table_switch_tables 75 * This exaple will lead to deadlock situation because after dm_table_get_entry 76 * table reference counter is != 0 and dm_table_destroy have to wait on cv until 77 * reference counter is 0. 78 * 79 */ 80 81 #include <sys/types.h> 82 #include <sys/param.h> 83 84 #include <sys/device.h> 85 #include <sys/disk.h> 86 #include <sys/disklabel.h> 87 #include <sys/malloc.h> 88 #include <sys/udev.h> 89 #include <sys/vnode.h> 90 91 #include "netbsd-dm.h" 92 #include "dm.h" 93 94 MALLOC_DECLARE(M_DM); 95 static uint64_t sc_minor_num; 96 extern struct dev_ops dm_ops; 97 uint64_t dm_dev_counter; 98 99 #if 0 100 /* Generic cf_data for device-mapper driver */ 101 static struct cfdata dm_cfdata = { 102 .cf_name = "dm", 103 .cf_atname = "dm", 104 .cf_fstate = FSTATE_STAR, 105 .cf_unit = 0 106 }; 107 #endif 108 109 #define DM_REMOVE_FLAG(flag, name) do { \ 110 prop_dictionary_get_uint32(dm_dict,DM_IOCTL_FLAGS,&flag); \ 111 flag &= ~name; \ 112 prop_dictionary_set_uint32(dm_dict,DM_IOCTL_FLAGS,flag); \ 113 } while (/*CONSTCOND*/0) 114 115 #define DM_ADD_FLAG(flag, name) do { \ 116 prop_dictionary_get_uint32(dm_dict,DM_IOCTL_FLAGS,&flag); \ 117 flag |= name; \ 118 prop_dictionary_set_uint32(dm_dict,DM_IOCTL_FLAGS,flag); \ 119 } while (/*CONSTCOND*/0) 120 121 static int dm_dbg_print_flags(int); 122 123 /* 124 * Print flags sent to the kernel from libevmapper. 125 */ 126 static int 127 dm_dbg_print_flags(int flags) 128 { 129 aprint_debug("dbg_print --- %d\n", flags); 130 131 if (flags & DM_READONLY_FLAG) 132 aprint_debug("dbg_flags: DM_READONLY_FLAG set In/Out\n"); 133 134 if (flags & DM_SUSPEND_FLAG) 135 aprint_debug("dbg_flags: DM_SUSPEND_FLAG set In/Out \n"); 136 137 if (flags & DM_PERSISTENT_DEV_FLAG) 138 aprint_debug("db_flags: DM_PERSISTENT_DEV_FLAG set In\n"); 139 140 if (flags & DM_STATUS_TABLE_FLAG) 141 aprint_debug("dbg_flags: DM_STATUS_TABLE_FLAG set In\n"); 142 143 if (flags & DM_ACTIVE_PRESENT_FLAG) 144 aprint_debug("dbg_flags: DM_ACTIVE_PRESENT_FLAG set Out\n"); 145 146 if (flags & DM_INACTIVE_PRESENT_FLAG) 147 aprint_debug("dbg_flags: DM_INACTIVE_PRESENT_FLAG set Out\n"); 148 149 if (flags & DM_BUFFER_FULL_FLAG) 150 aprint_debug("dbg_flags: DM_BUFFER_FULL_FLAG set Out\n"); 151 152 if (flags & DM_SKIP_BDGET_FLAG) 153 aprint_debug("dbg_flags: DM_SKIP_BDGET_FLAG set In\n"); 154 155 if (flags & DM_SKIP_LOCKFS_FLAG) 156 aprint_debug("dbg_flags: DM_SKIP_LOCKFS_FLAG set In\n"); 157 158 if (flags & DM_NOFLUSH_FLAG) 159 aprint_debug("dbg_flags: DM_NOFLUSH_FLAG set In\n"); 160 161 return 0; 162 } 163 /* 164 * Get version ioctl call I do it as default therefore this 165 * function is unused now. 166 */ 167 int 168 dm_get_version_ioctl(prop_dictionary_t dm_dict) 169 { 170 171 return 0; 172 } 173 /* 174 * Get list of all available targets from global 175 * target list and sent them back to libdevmapper. 176 */ 177 int 178 dm_list_versions_ioctl(prop_dictionary_t dm_dict) 179 { 180 prop_array_t target_list; 181 uint32_t flags; 182 183 flags = 0; 184 185 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags); 186 187 dm_dbg_print_flags(flags); 188 target_list = dm_target_prop_list(); 189 190 prop_dictionary_set(dm_dict, DM_IOCTL_CMD_DATA, target_list); 191 prop_object_release(target_list); 192 193 return 0; 194 } 195 /* 196 * Create in-kernel entry for device. Device attributes such as name, uuid are 197 * taken from proplib dictionary. 198 * 199 */ 200 int 201 dm_dev_create_ioctl(prop_dictionary_t dm_dict) 202 { 203 dm_dev_t *dmv; 204 const char *name, *uuid; 205 int r, flags; 206 207 r = 0; 208 flags = 0; 209 name = NULL; 210 uuid = NULL; 211 212 /* Get needed values from dictionary. */ 213 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_NAME, &name); 214 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_UUID, &uuid); 215 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags); 216 217 dm_dbg_print_flags(flags); 218 219 /* Lookup name and uuid if device already exist quit. */ 220 if ((dmv = dm_dev_lookup(name, uuid, -1)) != NULL) { 221 DM_ADD_FLAG(flags, DM_EXISTS_FLAG); /* Device already exists */ 222 dm_dev_unbusy(dmv); 223 return EEXIST; 224 } 225 #if 0 226 if ((devt = config_attach_pseudo(&dm_cfdata)) == NULL) { 227 aprint_error("Unable to attach pseudo device dm/%s\n", name); 228 return (ENOMEM); 229 } 230 #endif 231 if ((dmv = dm_dev_alloc()) == NULL) 232 return ENOMEM; 233 234 if (uuid) 235 strncpy(dmv->uuid, uuid, DM_UUID_LEN); 236 else 237 dmv->uuid[0] = '\0'; 238 239 if (name) 240 strlcpy(dmv->name, name, DM_NAME_LEN); 241 242 dmv->minor = ++sc_minor_num; /* XXX: was atomic 64 */ 243 dmv->flags = 0; /* device flags are set when needed */ 244 dmv->ref_cnt = 0; 245 dmv->event_nr = 0; 246 dmv->dev_type = 0; 247 248 dm_table_head_init(&dmv->table_head); 249 250 lockinit(&dmv->dev_mtx, "dmdev", 0, LK_CANRECURSE); 251 lockinit(&dmv->diskp_mtx, "dmdisk", 0, LK_CANRECURSE); 252 cv_init(&dmv->dev_cv, "dm_dev"); 253 254 if (flags & DM_READONLY_FLAG) 255 dmv->flags |= DM_READONLY_FLAG; 256 257 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_MINOR, dmv->minor); 258 259 aprint_debug("Creating device dm/%s\n", name); 260 dmv->devt = make_dev(&dm_ops, dmv->minor, UID_ROOT, GID_OPERATOR, 0640, "mapper/%s", dmv->name); 261 udev_dict_set_cstr(dmv->devt, "subsystem", "disk"); 262 #if 0 263 disk_init(dmv->diskp, dmv->name, &dmdkdriver); 264 disk_attach(dmv->diskp); 265 266 dmv->diskp->dk_info = NULL; 267 #endif 268 269 if ((r = dm_dev_insert(dmv)) != 0) 270 dm_dev_free(dmv); 271 272 DM_ADD_FLAG(flags, DM_EXISTS_FLAG); 273 DM_REMOVE_FLAG(flags, DM_INACTIVE_PRESENT_FLAG); 274 275 /* Increment device counter After creating device */ 276 ++dm_dev_counter; /* XXX: was atomic 64 */ 277 278 return r; 279 } 280 /* 281 * Get list of created device-mapper devices fromglobal list and 282 * send it to kernel. 283 * 284 * Output dictionary: 285 * 286 * <key>cmd_data</key> 287 * <array> 288 * <dict> 289 * <key>name<key> 290 * <string>...</string> 291 * 292 * <key>dev</key> 293 * <integer>...</integer> 294 * </dict> 295 * </array> 296 * 297 */ 298 int 299 dm_dev_list_ioctl(prop_dictionary_t dm_dict) 300 { 301 prop_array_t dev_list; 302 303 uint32_t flags; 304 305 flags = 0; 306 307 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags); 308 309 dm_dbg_print_flags(flags); 310 311 dev_list = dm_dev_prop_list(); 312 313 prop_dictionary_set(dm_dict, DM_IOCTL_CMD_DATA, dev_list); 314 prop_object_release(dev_list); 315 316 return 0; 317 } 318 /* 319 * Rename selected devices old name is in struct dm_ioctl. 320 * newname is taken from dictionary 321 * 322 * <key>cmd_data</key> 323 * <array> 324 * <string>...</string> 325 * </array> 326 */ 327 int 328 dm_dev_rename_ioctl(prop_dictionary_t dm_dict) 329 { 330 prop_array_t cmd_array; 331 dm_dev_t *dmv; 332 333 const char *name, *uuid, *n_name; 334 uint32_t flags, minor; 335 336 name = NULL; 337 uuid = NULL; 338 minor = 0; 339 340 /* Get needed values from dictionary. */ 341 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_NAME, &name); 342 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_UUID, &uuid); 343 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags); 344 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_MINOR, &minor); 345 346 dm_dbg_print_flags(flags); 347 348 cmd_array = prop_dictionary_get(dm_dict, DM_IOCTL_CMD_DATA); 349 350 prop_array_get_cstring_nocopy(cmd_array, 0, &n_name); 351 352 if (strlen(n_name) + 1 > DM_NAME_LEN) 353 return EINVAL; 354 355 if ((dmv = dm_dev_rem(name, uuid, minor)) == NULL) { 356 DM_REMOVE_FLAG(flags, DM_EXISTS_FLAG); 357 return ENOENT; 358 } 359 /* change device name */ 360 /* 361 * XXX How to deal with this change, name only used in 362 * dm_dev_routines, should I add dm_dev_change_name which will run 363 * under the dm_dev_list mutex ? 364 */ 365 strlcpy(dmv->name, n_name, DM_NAME_LEN); 366 367 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_OPEN, dmv->table_head.io_cnt); 368 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_MINOR, dmv->minor); 369 prop_dictionary_set_cstring(dm_dict, DM_IOCTL_UUID, dmv->uuid); 370 371 dm_dev_insert(dmv); 372 373 return 0; 374 } 375 /* 376 * Remove device from global list I have to remove active 377 * and inactive tables first. 378 */ 379 int 380 dm_dev_remove_ioctl(prop_dictionary_t dm_dict) 381 { 382 dm_dev_t *dmv; 383 const char *name, *uuid; 384 uint32_t flags, minor; 385 386 flags = 0; 387 name = NULL; 388 uuid = NULL; 389 390 /* Get needed values from dictionary. */ 391 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_NAME, &name); 392 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_UUID, &uuid); 393 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags); 394 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_MINOR, &minor); 395 396 dm_dbg_print_flags(flags); 397 398 /* 399 * This seems as hack to me, probably use routine dm_dev_get_devt to 400 * atomicaly get devt from device. 401 */ 402 if ((dmv = dm_dev_lookup(name, uuid, minor)) == NULL) { 403 DM_REMOVE_FLAG(flags, DM_EXISTS_FLAG); 404 return ENOENT; 405 } 406 407 dm_dev_unbusy(dmv); 408 409 /* 410 * This will call dm_detach routine which will actually removes 411 * device. 412 */ 413 return dm_detach(dmv); 414 } 415 /* 416 * Return actual state of device to libdevmapper. 417 */ 418 int 419 dm_dev_status_ioctl(prop_dictionary_t dm_dict) 420 { 421 dm_dev_t *dmv; 422 const char *name, *uuid; 423 uint32_t flags, j, minor; 424 425 name = NULL; 426 uuid = NULL; 427 flags = 0; 428 j = 0; 429 430 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_NAME, &name); 431 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_UUID, &uuid); 432 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags); 433 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_MINOR, &minor); 434 435 if ((dmv = dm_dev_lookup(name, uuid, minor)) == NULL) { 436 DM_REMOVE_FLAG(flags, DM_EXISTS_FLAG); 437 return ENOENT; 438 } 439 dm_dbg_print_flags(dmv->flags); 440 441 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_OPEN, dmv->table_head.io_cnt); 442 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_MINOR, dmv->minor); 443 prop_dictionary_set_cstring(dm_dict, DM_IOCTL_UUID, dmv->uuid); 444 445 if (dmv->flags & DM_SUSPEND_FLAG) 446 DM_ADD_FLAG(flags, DM_SUSPEND_FLAG); 447 448 /* 449 * Add status flags for tables I have to check both active and 450 * inactive tables. 451 */ 452 if ((j = dm_table_get_target_count(&dmv->table_head, DM_TABLE_ACTIVE))) { 453 DM_ADD_FLAG(flags, DM_ACTIVE_PRESENT_FLAG); 454 } else 455 DM_REMOVE_FLAG(flags, DM_ACTIVE_PRESENT_FLAG); 456 457 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_TARGET_COUNT, j); 458 459 if (dm_table_get_target_count(&dmv->table_head, DM_TABLE_INACTIVE)) 460 DM_ADD_FLAG(flags, DM_INACTIVE_PRESENT_FLAG); 461 else 462 DM_REMOVE_FLAG(flags, DM_INACTIVE_PRESENT_FLAG); 463 464 dm_dev_unbusy(dmv); 465 466 return 0; 467 } 468 /* 469 * Set only flag to suggest that device is suspended. This call is 470 * not supported in NetBSD. 471 * 472 */ 473 int 474 dm_dev_suspend_ioctl(prop_dictionary_t dm_dict) 475 { 476 dm_dev_t *dmv; 477 const char *name, *uuid; 478 uint32_t flags, minor; 479 480 name = NULL; 481 uuid = NULL; 482 flags = 0; 483 484 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_NAME, &name); 485 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_UUID, &uuid); 486 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags); 487 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_MINOR, &minor); 488 489 if ((dmv = dm_dev_lookup(name, uuid, minor)) == NULL) { 490 DM_REMOVE_FLAG(flags, DM_EXISTS_FLAG); 491 return ENOENT; 492 } 493 atomic_set_int(&dmv->flags, DM_SUSPEND_FLAG); 494 495 dm_dbg_print_flags(dmv->flags); 496 497 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_OPEN, dmv->table_head.io_cnt); 498 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_FLAGS, dmv->flags); 499 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_MINOR, dmv->minor); 500 501 dm_dev_unbusy(dmv); 502 503 /* Add flags to dictionary flag after dmv -> dict copy */ 504 DM_ADD_FLAG(flags, DM_EXISTS_FLAG); 505 506 return 0; 507 } 508 /* 509 * Simulate Linux behaviour better and switch tables here and not in 510 * dm_table_load_ioctl. 511 */ 512 int 513 dm_dev_resume_ioctl(prop_dictionary_t dm_dict) 514 { 515 dm_dev_t *dmv; 516 const char *name, *uuid; 517 uint32_t flags, minor; 518 519 name = NULL; 520 uuid = NULL; 521 flags = 0; 522 523 /* 524 * char *xml; xml = prop_dictionary_externalize(dm_dict); 525 * printf("%s\n",xml); 526 */ 527 528 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_NAME, &name); 529 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_UUID, &uuid); 530 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags); 531 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_MINOR, &minor); 532 533 /* Remove device from global device list */ 534 if ((dmv = dm_dev_lookup(name, uuid, minor)) == NULL) { 535 DM_REMOVE_FLAG(flags, DM_EXISTS_FLAG); 536 return ENOENT; 537 } 538 atomic_clear_int(&dmv->flags, (DM_SUSPEND_FLAG | DM_INACTIVE_PRESENT_FLAG)); 539 atomic_set_int(&dmv->flags, DM_ACTIVE_PRESENT_FLAG); 540 541 dm_table_switch_tables(&dmv->table_head); 542 543 DM_ADD_FLAG(flags, DM_EXISTS_FLAG); 544 545 dmsetdiskinfo(dmv->diskp, &dmv->table_head); 546 547 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_OPEN, dmv->table_head.io_cnt); 548 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_FLAGS, flags); 549 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_MINOR, dmv->minor); 550 551 dm_dev_unbusy(dmv); 552 553 /* Destroy inactive table after resume. */ 554 dm_table_destroy(&dmv->table_head, DM_TABLE_INACTIVE); 555 556 return 0; 557 } 558 /* 559 * Table management routines 560 * lvm2tools doens't send name/uuid to kernel with table 561 * for lookup I have to use minor number. 562 */ 563 564 /* 565 * Remove inactive table from device. Routines which work's with inactive tables 566 * doesn't need to synchronise with dmstrategy. They can synchronise themselves with mutex?. 567 * 568 */ 569 int 570 dm_table_clear_ioctl(prop_dictionary_t dm_dict) 571 { 572 dm_dev_t *dmv; 573 const char *name, *uuid; 574 uint32_t flags, minor; 575 576 dmv = NULL; 577 name = NULL; 578 uuid = NULL; 579 flags = 0; 580 minor = 0; 581 582 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_NAME, &name); 583 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_UUID, &uuid); 584 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags); 585 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_MINOR, &minor); 586 587 aprint_debug("Clearing inactive table from device: %s--%s\n", 588 name, uuid); 589 590 if ((dmv = dm_dev_lookup(name, uuid, minor)) == NULL) { 591 DM_REMOVE_FLAG(flags, DM_EXISTS_FLAG); 592 return ENOENT; 593 } 594 /* Select unused table */ 595 dm_table_destroy(&dmv->table_head, DM_TABLE_INACTIVE); 596 597 atomic_clear_int(&dmv->flags, DM_INACTIVE_PRESENT_FLAG); 598 599 dm_dev_unbusy(dmv); 600 601 return 0; 602 } 603 /* 604 * Get list of physical devices for active table. 605 * Get dev_t from pdev vnode and insert it into cmd_array. 606 * 607 * XXX. This function is called from lvm2tools to get information 608 * about physical devices, too e.g. during vgcreate. 609 */ 610 int 611 dm_table_deps_ioctl(prop_dictionary_t dm_dict) 612 { 613 dm_dev_t *dmv; 614 dm_table_t *tbl; 615 dm_table_entry_t *table_en; 616 617 prop_array_t cmd_array; 618 const char *name, *uuid; 619 uint32_t flags, minor; 620 621 int table_type; 622 size_t i; 623 624 name = NULL; 625 uuid = NULL; 626 dmv = NULL; 627 flags = 0; 628 629 i = 0; 630 631 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_NAME, &name); 632 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_UUID, &uuid); 633 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags); 634 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_MINOR, &minor); 635 636 /* create array for dev_t's */ 637 cmd_array = prop_array_create(); 638 639 if ((dmv = dm_dev_lookup(name, uuid, minor)) == NULL) { 640 DM_REMOVE_FLAG(flags, DM_EXISTS_FLAG); 641 return ENOENT; 642 } 643 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_MINOR, dmv->minor); 644 prop_dictionary_set_cstring(dm_dict, DM_IOCTL_NAME, dmv->name); 645 prop_dictionary_set_cstring(dm_dict, DM_IOCTL_UUID, dmv->uuid); 646 647 aprint_debug("Getting table deps for device: %s\n", dmv->name); 648 649 /* 650 * if DM_QUERY_INACTIVE_TABLE_FLAG is passed we need to query 651 * INACTIVE TABLE 652 */ 653 if (flags & DM_QUERY_INACTIVE_TABLE_FLAG) 654 table_type = DM_TABLE_INACTIVE; 655 else 656 table_type = DM_TABLE_ACTIVE; 657 658 tbl = dm_table_get_entry(&dmv->table_head, table_type); 659 660 SLIST_FOREACH(table_en, tbl, next) 661 table_en->target->deps(table_en, cmd_array); 662 663 dm_table_release(&dmv->table_head, table_type); 664 dm_dev_unbusy(dmv); 665 666 prop_dictionary_set(dm_dict, DM_IOCTL_CMD_DATA, cmd_array); 667 prop_object_release(cmd_array); 668 669 return 0; 670 } 671 /* 672 * Load new table/tables to device. 673 * Call apropriate target init routine open all physical pdev's and 674 * link them to device. For other targets mirror, strip, snapshot 675 * etc. also add dependency devices to upcalls list. 676 * 677 * Load table to inactive slot table are switched in dm_device_resume_ioctl. 678 * This simulates Linux behaviour better there should not be any difference. 679 * 680 */ 681 int 682 dm_table_load_ioctl(prop_dictionary_t dm_dict) 683 { 684 dm_dev_t *dmv; 685 dm_table_entry_t *table_en, *last_table; 686 dm_table_t *tbl; 687 dm_target_t *target; 688 689 prop_object_iterator_t iter; 690 prop_array_t cmd_array; 691 prop_dictionary_t target_dict; 692 693 const char *name, *uuid, *type; 694 695 uint32_t flags, ret, minor; 696 697 char *str; 698 699 ret = 0; 700 flags = 0; 701 name = NULL; 702 uuid = NULL; 703 dmv = NULL; 704 last_table = NULL; 705 str = NULL; 706 707 /* 708 * char *xml; xml = prop_dictionary_externalize(dm_dict); 709 * printf("%s\n",xml); 710 */ 711 712 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_NAME, &name); 713 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_UUID, &uuid); 714 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags); 715 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_MINOR, &minor); 716 717 cmd_array = prop_dictionary_get(dm_dict, DM_IOCTL_CMD_DATA); 718 iter = prop_array_iterator(cmd_array); 719 dm_dbg_print_flags(flags); 720 721 if ((dmv = dm_dev_lookup(name, uuid, minor)) == NULL) { 722 DM_REMOVE_FLAG(flags, DM_EXISTS_FLAG); 723 return ENOENT; 724 } 725 aprint_debug("Loading table to device: %s--%d\n", name, 726 dmv->table_head.cur_active_table); 727 728 /* 729 * I have to check if this table slot is not used by another table list. 730 * if it is used I should free them. 731 */ 732 if (dmv->flags & DM_INACTIVE_PRESENT_FLAG) 733 dm_table_destroy(&dmv->table_head, DM_TABLE_INACTIVE); 734 735 dm_dbg_print_flags(dmv->flags); 736 tbl = dm_table_get_entry(&dmv->table_head, DM_TABLE_INACTIVE); 737 738 aprint_debug("dmv->name = %s\n", dmv->name); 739 740 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_MINOR, dmv->minor); 741 742 while ((target_dict = prop_object_iterator_next(iter)) != NULL) { 743 prop_dictionary_get_cstring_nocopy(target_dict, 744 DM_TABLE_TYPE, &type); 745 /* 746 * If we want to deny table with 2 or more different 747 * target we should do it here 748 */ 749 if (((target = dm_target_lookup(type)) == NULL) && 750 ((target = dm_target_autoload(type)) == NULL)) { 751 dm_table_release(&dmv->table_head, DM_TABLE_INACTIVE); 752 dm_dev_unbusy(dmv); 753 return ENOENT; 754 } 755 if ((table_en = kmalloc(sizeof(dm_table_entry_t), 756 M_DM, M_WAITOK)) == NULL) { 757 dm_table_release(&dmv->table_head, DM_TABLE_INACTIVE); 758 dm_dev_unbusy(dmv); 759 return ENOMEM; 760 } 761 prop_dictionary_get_uint64(target_dict, DM_TABLE_START, 762 &table_en->start); 763 prop_dictionary_get_uint64(target_dict, DM_TABLE_LENGTH, 764 &table_en->length); 765 766 aprint_debug("dm_ioctl.c... table_en->start = %ju, " 767 "table_en->length = %ju\n", 768 (uintmax_t)table_en->start, 769 (uintmax_t)table_en->length); 770 771 table_en->target = target; 772 table_en->dm_dev = dmv; 773 table_en->target_config = NULL; 774 775 /* 776 * There is a parameter string after dm_target_spec 777 * structure which points to /dev/wd0a 284 part of 778 * table. String str points to this text. This can be 779 * null and therefore it should be checked before we try to 780 * use it. 781 */ 782 prop_dictionary_get_cstring(target_dict, 783 DM_TABLE_PARAMS, (char **) &str); 784 785 if (SLIST_EMPTY(tbl)) 786 /* insert this table to head */ 787 SLIST_INSERT_HEAD(tbl, table_en, next); 788 else 789 SLIST_INSERT_AFTER(last_table, table_en, next); 790 791 /* 792 * Params string is different for every target, 793 * therfore I have to pass it to target init 794 * routine and parse parameters there. 795 */ 796 aprint_debug("DM: str passed in is: %s", str); 797 if ((ret = target->init(dmv, &table_en->target_config, 798 str)) != 0) { 799 800 dm_table_release(&dmv->table_head, DM_TABLE_INACTIVE); 801 dm_table_destroy(&dmv->table_head, DM_TABLE_INACTIVE); 802 kfree(str, M_TEMP); 803 804 dm_dev_unbusy(dmv); 805 return ret; 806 } 807 last_table = table_en; 808 kfree(str, M_TEMP); 809 } 810 prop_object_iterator_release(iter); 811 812 DM_ADD_FLAG(flags, DM_INACTIVE_PRESENT_FLAG); 813 atomic_set_int(&dmv->flags, DM_INACTIVE_PRESENT_FLAG); 814 815 dm_table_release(&dmv->table_head, DM_TABLE_INACTIVE); 816 dm_dev_unbusy(dmv); 817 return 0; 818 } 819 /* 820 * Get description of all tables loaded to device from kernel 821 * and send it to libdevmapper. 822 * 823 * Output dictionary for every table: 824 * 825 * <key>cmd_data</key> 826 * <array> 827 * <dict> 828 * <key>type<key> 829 * <string>...</string> 830 * 831 * <key>start</key> 832 * <integer>...</integer> 833 * 834 * <key>length</key> 835 * <integer>...</integer> 836 * 837 * <key>params</key> 838 * <string>...</string> 839 * </dict> 840 * </array> 841 * 842 */ 843 int 844 dm_table_status_ioctl(prop_dictionary_t dm_dict) 845 { 846 dm_dev_t *dmv; 847 dm_table_t *tbl; 848 dm_table_entry_t *table_en; 849 850 prop_array_t cmd_array; 851 prop_dictionary_t target_dict; 852 853 uint32_t rec_size, minor; 854 855 const char *name, *uuid; 856 char *params; 857 int flags; 858 int table_type; 859 860 dmv = NULL; 861 uuid = NULL; 862 name = NULL; 863 params = NULL; 864 flags = 0; 865 rec_size = 0; 866 867 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_NAME, &name); 868 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_UUID, &uuid); 869 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags); 870 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_MINOR, &minor); 871 872 cmd_array = prop_array_create(); 873 874 if ((dmv = dm_dev_lookup(name, uuid, minor)) == NULL) { 875 DM_REMOVE_FLAG(flags, DM_EXISTS_FLAG); 876 return ENOENT; 877 } 878 /* 879 * if DM_QUERY_INACTIVE_TABLE_FLAG is passed we need to query 880 * INACTIVE TABLE 881 */ 882 if (flags & DM_QUERY_INACTIVE_TABLE_FLAG) 883 table_type = DM_TABLE_INACTIVE; 884 else 885 table_type = DM_TABLE_ACTIVE; 886 887 if (dm_table_get_target_count(&dmv->table_head, DM_TABLE_ACTIVE)) 888 DM_ADD_FLAG(flags, DM_ACTIVE_PRESENT_FLAG); 889 else { 890 DM_REMOVE_FLAG(flags, DM_ACTIVE_PRESENT_FLAG); 891 892 if (dm_table_get_target_count(&dmv->table_head, DM_TABLE_INACTIVE)) 893 DM_ADD_FLAG(flags, DM_INACTIVE_PRESENT_FLAG); 894 else { 895 DM_REMOVE_FLAG(flags, DM_INACTIVE_PRESENT_FLAG); 896 } 897 } 898 899 if (dmv->flags & DM_SUSPEND_FLAG) 900 DM_ADD_FLAG(flags, DM_SUSPEND_FLAG); 901 902 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_MINOR, dmv->minor); 903 904 aprint_debug("Status of device tables: %s--%d\n", 905 name, dmv->table_head.cur_active_table); 906 907 tbl = dm_table_get_entry(&dmv->table_head, table_type); 908 909 SLIST_FOREACH(table_en, tbl, next) { 910 target_dict = prop_dictionary_create(); 911 aprint_debug("%016" PRIu64 ", length %016" PRIu64 912 ", target %s\n", table_en->start, table_en->length, 913 table_en->target->name); 914 915 prop_dictionary_set_uint64(target_dict, DM_TABLE_START, 916 table_en->start); 917 prop_dictionary_set_uint64(target_dict, DM_TABLE_LENGTH, 918 table_en->length); 919 920 prop_dictionary_set_cstring(target_dict, DM_TABLE_TYPE, 921 table_en->target->name); 922 923 /* dm_table_get_cur_actv.table ?? */ 924 prop_dictionary_set_int32(target_dict, DM_TABLE_STAT, 925 dmv->table_head.cur_active_table); 926 927 if (flags |= DM_STATUS_TABLE_FLAG) { 928 params = table_en->target->status 929 (table_en->target_config); 930 931 if (params != NULL) { 932 prop_dictionary_set_cstring(target_dict, 933 DM_TABLE_PARAMS, params); 934 935 kfree(params, M_DM); 936 } 937 } 938 prop_array_add(cmd_array, target_dict); 939 prop_object_release(target_dict); 940 } 941 942 dm_table_release(&dmv->table_head, table_type); 943 dm_dev_unbusy(dmv); 944 945 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_FLAGS, flags); 946 prop_dictionary_set(dm_dict, DM_IOCTL_CMD_DATA, cmd_array); 947 prop_object_release(cmd_array); 948 949 return 0; 950 } 951 952 953 /* 954 * For every call I have to set kernel driver version. 955 * Because I can have commands supported only in other 956 * newer/later version. This routine is called for every 957 * ioctl command. 958 */ 959 int 960 dm_check_version(prop_dictionary_t dm_dict) 961 { 962 size_t i; 963 int dm_version[3]; 964 prop_array_t ver; 965 966 ver = prop_dictionary_get(dm_dict, DM_IOCTL_VERSION); 967 968 for (i = 0; i < 3; i++) 969 prop_array_get_uint32(ver, i, &dm_version[i]); 970 971 if (DM_VERSION_MAJOR != dm_version[0] || DM_VERSION_MINOR < dm_version[1]) { 972 aprint_debug("libdevmapper/kernel version mismatch " 973 "kernel: %d.%d.%d libdevmapper: %d.%d.%d\n", 974 DM_VERSION_MAJOR, DM_VERSION_MINOR, DM_VERSION_PATCHLEVEL, 975 dm_version[0], dm_version[1], dm_version[2]); 976 977 return EIO; 978 } 979 prop_array_set_uint32(ver, 0, DM_VERSION_MAJOR); 980 prop_array_set_uint32(ver, 1, DM_VERSION_MINOR); 981 prop_array_set_uint32(ver, 2, DM_VERSION_PATCHLEVEL); 982 983 prop_dictionary_set(dm_dict, DM_IOCTL_VERSION, ver); 984 985 return 0; 986 } 987