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