dm_ioctl.c revision 1.30.8.1
1 /* $NetBSD: dm_ioctl.c,v 1.30.8.1 2017/05/17 01:44:17 pgoyette 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/kmem.h> 88 #include <sys/malloc.h> 89 #include <sys/vnode.h> 90 91 #include <machine/int_fmtio.h> 92 93 #include "netbsd-dm.h" 94 #include "dm.h" 95 96 static uint32_t sc_minor_num; 97 extern const struct dkdriver dmdkdriver; 98 uint32_t dm_dev_counter; 99 100 /* 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 #define DM_REMOVE_FLAG(flag, name) do { \ 108 prop_dictionary_get_uint32(dm_dict,DM_IOCTL_FLAGS,&flag); \ 109 flag &= ~name; \ 110 prop_dictionary_set_uint32(dm_dict,DM_IOCTL_FLAGS,flag); \ 111 } while (/*CONSTCOND*/0) 112 113 #define DM_ADD_FLAG(flag, name) do { \ 114 prop_dictionary_get_uint32(dm_dict,DM_IOCTL_FLAGS,&flag); \ 115 flag |= name; \ 116 prop_dictionary_set_uint32(dm_dict,DM_IOCTL_FLAGS,flag); \ 117 } while (/*CONSTCOND*/0) 118 119 static int dm_dbg_print_flags(int); 120 121 /* 122 * Print flags sent to the kernel from libevmapper. 123 */ 124 static int 125 dm_dbg_print_flags(int flags) 126 { 127 aprint_debug("dbg_print --- %d\n", flags); 128 129 if (flags & DM_READONLY_FLAG) 130 aprint_debug("dbg_flags: DM_READONLY_FLAG set In/Out\n"); 131 132 if (flags & DM_SUSPEND_FLAG) 133 aprint_debug("dbg_flags: DM_SUSPEND_FLAG set In/Out \n"); 134 135 if (flags & DM_PERSISTENT_DEV_FLAG) 136 aprint_debug("db_flags: DM_PERSISTENT_DEV_FLAG set In\n"); 137 138 if (flags & DM_STATUS_TABLE_FLAG) 139 aprint_debug("dbg_flags: DM_STATUS_TABLE_FLAG set In\n"); 140 141 if (flags & DM_ACTIVE_PRESENT_FLAG) 142 aprint_debug("dbg_flags: DM_ACTIVE_PRESENT_FLAG set Out\n"); 143 144 if (flags & DM_INACTIVE_PRESENT_FLAG) 145 aprint_debug("dbg_flags: DM_INACTIVE_PRESENT_FLAG set Out\n"); 146 147 if (flags & DM_BUFFER_FULL_FLAG) 148 aprint_debug("dbg_flags: DM_BUFFER_FULL_FLAG set Out\n"); 149 150 if (flags & DM_SKIP_BDGET_FLAG) 151 aprint_debug("dbg_flags: DM_SKIP_BDGET_FLAG set In\n"); 152 153 if (flags & DM_SKIP_LOCKFS_FLAG) 154 aprint_debug("dbg_flags: DM_SKIP_LOCKFS_FLAG set In\n"); 155 156 if (flags & DM_NOFLUSH_FLAG) 157 aprint_debug("dbg_flags: DM_NOFLUSH_FLAG set In\n"); 158 159 return 0; 160 } 161 /* 162 * Get version ioctl call I do it as default therefore this 163 * function is unused now. 164 */ 165 int 166 dm_get_version_ioctl(prop_dictionary_t dm_dict) 167 { 168 169 return 0; 170 } 171 /* 172 * Get list of all available targets from global 173 * target list and sent them back to libdevmapper. 174 */ 175 int 176 dm_list_versions_ioctl(prop_dictionary_t dm_dict) 177 { 178 prop_array_t target_list; 179 uint32_t flags; 180 181 flags = 0; 182 183 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags); 184 185 dm_dbg_print_flags(flags); 186 target_list = dm_target_prop_list(); 187 188 prop_dictionary_set(dm_dict, DM_IOCTL_CMD_DATA, target_list); 189 prop_object_release(target_list); 190 191 return 0; 192 } 193 /* 194 * Create in-kernel entry for device. Device attributes such as name, uuid are 195 * taken from proplib dictionary. 196 * 197 */ 198 int 199 dm_dev_create_ioctl(prop_dictionary_t dm_dict) 200 { 201 dm_dev_t *dmv; 202 const char *name, *uuid; 203 int r; 204 uint32_t flags; 205 device_t devt; 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 ((devt = config_attach_pseudo(&dm_cfdata)) == NULL) { 226 aprint_error("Unable to attach pseudo device dm/%s\n", name); 227 return (ENOMEM); 228 } 229 if ((dmv = dm_dev_alloc()) == NULL) { 230 device_release(devt); 231 return ENOMEM; 232 } 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 = (uint64_t)atomic_inc_32_nv(&sc_minor_num); 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 dmv->devt = devt; 248 249 dm_table_head_init(&dmv->table_head); 250 251 mutex_init(&dmv->dev_mtx, MUTEX_DEFAULT, IPL_NONE); 252 mutex_init(&dmv->diskp_mtx, MUTEX_DEFAULT, IPL_NONE); 253 cv_init(&dmv->dev_cv, "dm_dev"); 254 255 if (flags & DM_READONLY_FLAG) 256 dmv->flags |= DM_READONLY_FLAG; 257 258 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_MINOR, dmv->minor); 259 260 disk_init(dmv->diskp, dmv->name, &dmdkdriver); 261 disk_attach(dmv->diskp); 262 263 dmv->diskp->dk_info = NULL; 264 265 if ((r = dm_dev_insert(dmv)) != 0) 266 dm_dev_free(dmv); 267 268 DM_ADD_FLAG(flags, DM_EXISTS_FLAG); 269 DM_REMOVE_FLAG(flags, DM_INACTIVE_PRESENT_FLAG); 270 271 /* Increment device counter After creating device */ 272 atomic_inc_32(&dm_dev_counter); 273 274 device_release(devt); 275 return r; 276 } 277 /* 278 * Get list of created device-mapper devices fromglobal list and 279 * send it to kernel. 280 * 281 * Output dictionary: 282 * 283 * <key>cmd_data</key> 284 * <array> 285 * <dict> 286 * <key>name<key> 287 * <string>...</string> 288 * 289 * <key>dev</key> 290 * <integer>...</integer> 291 * </dict> 292 * </array> 293 * 294 */ 295 int 296 dm_dev_list_ioctl(prop_dictionary_t dm_dict) 297 { 298 prop_array_t dev_list; 299 300 uint32_t flags; 301 302 flags = 0; 303 304 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags); 305 306 dm_dbg_print_flags(flags); 307 308 dev_list = dm_dev_prop_list(); 309 310 prop_dictionary_set(dm_dict, DM_IOCTL_CMD_DATA, dev_list); 311 prop_object_release(dev_list); 312 313 return 0; 314 } 315 /* 316 * Rename selected devices old name is in struct dm_ioctl. 317 * newname is taken from dictionary 318 * 319 * <key>cmd_data</key> 320 * <array> 321 * <string>...</string> 322 * </array> 323 */ 324 int 325 dm_dev_rename_ioctl(prop_dictionary_t dm_dict) 326 { 327 prop_array_t cmd_array; 328 dm_dev_t *dmv; 329 330 const char *name, *uuid, *n_name; 331 uint32_t flags, minor; 332 333 name = NULL; 334 uuid = NULL; 335 minor = 0; 336 337 /* Get needed values from dictionary. */ 338 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_NAME, &name); 339 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_UUID, &uuid); 340 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags); 341 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_MINOR, &minor); 342 343 dm_dbg_print_flags(flags); 344 345 cmd_array = prop_dictionary_get(dm_dict, DM_IOCTL_CMD_DATA); 346 347 prop_array_get_cstring_nocopy(cmd_array, 0, &n_name); 348 349 if (strlen(n_name) + 1 > DM_NAME_LEN) 350 return EINVAL; 351 352 if ((dmv = dm_dev_rem(name, uuid, minor)) == NULL) { 353 DM_REMOVE_FLAG(flags, DM_EXISTS_FLAG); 354 return ENOENT; 355 } 356 /* change device name */ 357 /* 358 * XXX How to deal with this change, name only used in 359 * dm_dev_routines, should I add dm_dev_change_name which will run 360 * under the dm_dev_list mutex ? 361 */ 362 strlcpy(dmv->name, n_name, DM_NAME_LEN); 363 364 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_OPEN, dmv->table_head.io_cnt); 365 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_MINOR, dmv->minor); 366 prop_dictionary_set_cstring(dm_dict, DM_IOCTL_UUID, dmv->uuid); 367 368 dm_dev_insert(dmv); 369 370 return 0; 371 } 372 /* 373 * Remove device from global list I have to remove active 374 * and inactive tables first. 375 */ 376 int 377 dm_dev_remove_ioctl(prop_dictionary_t dm_dict) 378 { 379 dm_dev_t *dmv; 380 const char *name, *uuid; 381 uint32_t flags, minor; 382 device_t devt; 383 384 flags = 0; 385 name = NULL; 386 uuid = NULL; 387 388 /* Get needed values from dictionary. */ 389 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_NAME, &name); 390 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_UUID, &uuid); 391 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags); 392 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_MINOR, &minor); 393 394 dm_dbg_print_flags(flags); 395 396 /* 397 * This seems as hack to me, probably use routine dm_dev_get_devt to 398 * atomicaly get devt from device. 399 */ 400 if ((dmv = dm_dev_lookup(name, uuid, minor)) == NULL) { 401 DM_REMOVE_FLAG(flags, DM_EXISTS_FLAG); 402 return ENOENT; 403 } 404 devt = dmv->devt; 405 406 dm_dev_unbusy(dmv); 407 408 /* 409 * This will call dm_detach routine which will actually removes 410 * device. 411 */ 412 return config_detach(devt, DETACH_QUIET); 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_or_32(&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_and_32(&dmv->flags, ~(DM_SUSPEND_FLAG | DM_INACTIVE_PRESENT_FLAG)); 538 atomic_or_32(&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 dmgetproperties(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_and_32(&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; 621 622 name = NULL; 623 uuid = NULL; 624 dmv = NULL; 625 flags = 0; 626 627 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_NAME, &name); 628 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_UUID, &uuid); 629 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags); 630 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_MINOR, &minor); 631 632 /* create array for dev_t's */ 633 cmd_array = prop_array_create(); 634 635 if ((dmv = dm_dev_lookup(name, uuid, minor)) == NULL) { 636 DM_REMOVE_FLAG(flags, DM_EXISTS_FLAG); 637 return ENOENT; 638 } 639 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_MINOR, dmv->minor); 640 prop_dictionary_set_cstring(dm_dict, DM_IOCTL_NAME, dmv->name); 641 prop_dictionary_set_cstring(dm_dict, DM_IOCTL_UUID, dmv->uuid); 642 643 aprint_debug("Getting table deps for device: %s\n", dmv->name); 644 645 /* 646 * if DM_QUERY_INACTIVE_TABLE_FLAG is passed we need to query 647 * INACTIVE TABLE 648 */ 649 if (flags & DM_QUERY_INACTIVE_TABLE_FLAG) 650 table_type = DM_TABLE_INACTIVE; 651 else 652 table_type = DM_TABLE_ACTIVE; 653 654 tbl = dm_table_get_entry(&dmv->table_head, table_type); 655 656 SLIST_FOREACH(table_en, tbl, next) 657 table_en->target->deps(table_en, cmd_array); 658 659 dm_table_release(&dmv->table_head, table_type); 660 dm_dev_unbusy(dmv); 661 662 prop_dictionary_set(dm_dict, DM_IOCTL_CMD_DATA, cmd_array); 663 prop_object_release(cmd_array); 664 665 return 0; 666 } 667 /* 668 * Load new table/tables to device. 669 * Call apropriate target init routine open all physical pdev's and 670 * link them to device. For other targets mirror, strip, snapshot 671 * etc. also add dependency devices to upcalls list. 672 * 673 * Load table to inactive slot table are switched in dm_device_resume_ioctl. 674 * This simulates Linux behaviour better there should not be any difference. 675 * 676 */ 677 int 678 dm_table_load_ioctl(prop_dictionary_t dm_dict) 679 { 680 dm_dev_t *dmv; 681 dm_table_entry_t *table_en, *last_table; 682 dm_table_t *tbl; 683 dm_target_t *target; 684 685 prop_object_iterator_t iter; 686 prop_array_t cmd_array; 687 prop_dictionary_t target_dict; 688 689 const char *name, *uuid, *type; 690 691 uint32_t flags, ret, minor; 692 693 char *str; 694 695 ret = 0; 696 flags = 0; 697 name = NULL; 698 uuid = NULL; 699 dmv = NULL; 700 last_table = NULL; 701 str = NULL; 702 703 /* 704 * char *xml; xml = prop_dictionary_externalize(dm_dict); 705 * printf("%s\n",xml); 706 */ 707 708 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_NAME, &name); 709 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_UUID, &uuid); 710 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags); 711 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_MINOR, &minor); 712 713 cmd_array = prop_dictionary_get(dm_dict, DM_IOCTL_CMD_DATA); 714 iter = prop_array_iterator(cmd_array); 715 dm_dbg_print_flags(flags); 716 717 if ((dmv = dm_dev_lookup(name, uuid, minor)) == NULL) { 718 DM_REMOVE_FLAG(flags, DM_EXISTS_FLAG); 719 prop_object_iterator_release(iter); 720 return ENOENT; 721 } 722 aprint_debug("Loading table to device: %s--%d\n", name, 723 dmv->table_head.cur_active_table); 724 725 /* 726 * I have to check if this table slot is not used by another table list. 727 * if it is used I should free them. 728 */ 729 if (dmv->flags & DM_INACTIVE_PRESENT_FLAG) 730 dm_table_destroy(&dmv->table_head, DM_TABLE_INACTIVE); 731 732 dm_dbg_print_flags(dmv->flags); 733 tbl = dm_table_get_entry(&dmv->table_head, DM_TABLE_INACTIVE); 734 735 aprint_debug("dmv->name = %s\n", dmv->name); 736 737 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_MINOR, dmv->minor); 738 739 while ((target_dict = prop_object_iterator_next(iter)) != NULL) { 740 741 prop_dictionary_get_cstring_nocopy(target_dict, 742 DM_TABLE_TYPE, &type); 743 /* 744 * If we want to deny table with 2 or more different 745 * target we should do it here 746 */ 747 if (((target = dm_target_lookup(type)) == NULL) && 748 ((target = dm_target_autoload(type)) == NULL)) { 749 dm_table_release(&dmv->table_head, DM_TABLE_INACTIVE); 750 dm_dev_unbusy(dmv); 751 prop_object_iterator_release(iter); 752 return ENOENT; 753 } 754 if ((table_en = kmem_alloc(sizeof(dm_table_entry_t), 755 KM_SLEEP)) == NULL) { 756 dm_table_release(&dmv->table_head, DM_TABLE_INACTIVE); 757 dm_dev_unbusy(dmv); 758 prop_object_iterator_release(iter); 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 table_en->target = target; 767 table_en->dm_dev = dmv; 768 table_en->target_config = NULL; 769 770 /* 771 * There is a parameter string after dm_target_spec 772 * structure which points to /dev/wd0a 284 part of 773 * table. String str points to this text. This can be 774 * null and therefore it should be checked before we try to 775 * use it. 776 */ 777 prop_dictionary_get_cstring(target_dict, 778 DM_TABLE_PARAMS, (char **) &str); 779 780 if (SLIST_EMPTY(tbl) || last_table == NULL) 781 /* insert this table to head */ 782 SLIST_INSERT_HEAD(tbl, table_en, next); 783 else 784 SLIST_INSERT_AFTER(last_table, table_en, next); 785 786 /* 787 * Params string is different for every target, 788 * therfore I have to pass it to target init 789 * routine and parse parameters there. 790 */ 791 792 if ((ret = target->init(dmv, &table_en->target_config, 793 str)) != 0) { 794 795 dm_table_release(&dmv->table_head, DM_TABLE_INACTIVE); 796 dm_table_destroy(&dmv->table_head, DM_TABLE_INACTIVE); 797 free(str, M_TEMP); 798 799 dm_dev_unbusy(dmv); 800 dm_target_unbusy(target); 801 prop_object_iterator_release(iter); 802 return ret; 803 } 804 last_table = table_en; 805 free(str, M_TEMP); 806 } 807 prop_object_iterator_release(iter); 808 809 DM_ADD_FLAG(flags, DM_INACTIVE_PRESENT_FLAG); 810 atomic_or_32(&dmv->flags, DM_INACTIVE_PRESENT_FLAG); 811 812 dm_table_release(&dmv->table_head, DM_TABLE_INACTIVE); 813 dm_dev_unbusy(dmv); 814 return 0; 815 } 816 /* 817 * Get description of all tables loaded to device from kernel 818 * and send it to libdevmapper. 819 * 820 * Output dictionary for every table: 821 * 822 * <key>cmd_data</key> 823 * <array> 824 * <dict> 825 * <key>type<key> 826 * <string>...</string> 827 * 828 * <key>start</key> 829 * <integer>...</integer> 830 * 831 * <key>length</key> 832 * <integer>...</integer> 833 * 834 * <key>params</key> 835 * <string>...</string> 836 * </dict> 837 * </array> 838 * 839 */ 840 int 841 dm_table_status_ioctl(prop_dictionary_t dm_dict) 842 { 843 dm_dev_t *dmv; 844 dm_table_t *tbl; 845 dm_table_entry_t *table_en; 846 847 prop_array_t cmd_array; 848 prop_dictionary_t target_dict; 849 850 uint32_t minor, flags; 851 852 const char *name, *uuid; 853 char *params; 854 int table_type; 855 856 dmv = NULL; 857 uuid = NULL; 858 name = NULL; 859 params = NULL; 860 flags = 0; 861 862 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_NAME, &name); 863 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_UUID, &uuid); 864 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags); 865 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_MINOR, &minor); 866 867 cmd_array = prop_array_create(); 868 869 if ((dmv = dm_dev_lookup(name, uuid, minor)) == NULL) { 870 DM_REMOVE_FLAG(flags, DM_EXISTS_FLAG); 871 return ENOENT; 872 } 873 /* 874 * if DM_QUERY_INACTIVE_TABLE_FLAG is passed we need to query 875 * INACTIVE TABLE 876 */ 877 if (flags & DM_QUERY_INACTIVE_TABLE_FLAG) 878 table_type = DM_TABLE_INACTIVE; 879 else 880 table_type = DM_TABLE_ACTIVE; 881 882 if (dm_table_get_target_count(&dmv->table_head, DM_TABLE_ACTIVE)) 883 DM_ADD_FLAG(flags, DM_ACTIVE_PRESENT_FLAG); 884 else { 885 DM_REMOVE_FLAG(flags, DM_ACTIVE_PRESENT_FLAG); 886 887 if (dm_table_get_target_count(&dmv->table_head, DM_TABLE_INACTIVE)) 888 DM_ADD_FLAG(flags, DM_INACTIVE_PRESENT_FLAG); 889 else { 890 DM_REMOVE_FLAG(flags, DM_INACTIVE_PRESENT_FLAG); 891 } 892 } 893 894 if (dmv->flags & DM_SUSPEND_FLAG) 895 DM_ADD_FLAG(flags, DM_SUSPEND_FLAG); 896 897 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_MINOR, dmv->minor); 898 899 aprint_debug("Status of device tables: %s--%d\n", 900 name, dmv->table_head.cur_active_table); 901 902 tbl = dm_table_get_entry(&dmv->table_head, table_type); 903 904 SLIST_FOREACH(table_en, tbl, next) { 905 target_dict = prop_dictionary_create(); 906 aprint_debug("%016" PRIu64 ", length %016" PRIu64 907 ", target %s\n", table_en->start, table_en->length, 908 table_en->target->name); 909 910 prop_dictionary_set_uint64(target_dict, DM_TABLE_START, 911 table_en->start); 912 prop_dictionary_set_uint64(target_dict, DM_TABLE_LENGTH, 913 table_en->length); 914 915 prop_dictionary_set_cstring(target_dict, DM_TABLE_TYPE, 916 table_en->target->name); 917 918 /* dm_table_get_cur_actv.table ?? */ 919 prop_dictionary_set_int32(target_dict, DM_TABLE_STAT, 920 dmv->table_head.cur_active_table); 921 922 if (flags & DM_STATUS_TABLE_FLAG) { 923 params = table_en->target->status 924 (table_en->target_config); 925 926 if (params != NULL) { 927 prop_dictionary_set_cstring(target_dict, 928 DM_TABLE_PARAMS, params); 929 930 kmem_free(params, DM_MAX_PARAMS_SIZE); 931 } 932 } 933 prop_array_add(cmd_array, target_dict); 934 prop_object_release(target_dict); 935 } 936 937 dm_table_release(&dmv->table_head, table_type); 938 dm_dev_unbusy(dmv); 939 940 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_FLAGS, flags); 941 prop_dictionary_set(dm_dict, DM_IOCTL_CMD_DATA, cmd_array); 942 prop_object_release(cmd_array); 943 944 return 0; 945 } 946 947 948 /* 949 * For every call I have to set kernel driver version. 950 * Because I can have commands supported only in other 951 * newer/later version. This routine is called for every 952 * ioctl command. 953 */ 954 int 955 dm_check_version(prop_dictionary_t dm_dict) 956 { 957 size_t i; 958 uint32_t dm_version[3]; 959 prop_array_t ver; 960 961 ver = prop_dictionary_get(dm_dict, DM_IOCTL_VERSION); 962 963 for (i = 0; i < 3; i++) 964 prop_array_get_uint32(ver, i, &dm_version[i]); 965 966 if (DM_VERSION_MAJOR != dm_version[0] || DM_VERSION_MINOR < dm_version[1]) { 967 aprint_debug("libdevmapper/kernel version mismatch " 968 "kernel: %d.%d.%d libdevmapper: %d.%d.%d\n", 969 DM_VERSION_MAJOR, DM_VERSION_MINOR, DM_VERSION_PATCHLEVEL, 970 dm_version[0], dm_version[1], dm_version[2]); 971 972 return EIO; 973 } 974 prop_array_set_uint32(ver, 0, DM_VERSION_MAJOR); 975 prop_array_set_uint32(ver, 1, DM_VERSION_MINOR); 976 prop_array_set_uint32(ver, 2, DM_VERSION_PATCHLEVEL); 977 978 prop_dictionary_set(dm_dict, DM_IOCTL_VERSION, ver); 979 980 return 0; 981 } 982
Indexes created Tue Sep 30 17:09:57 GMT 2025