dm_ioctl.c revision 1.37
1 /* $NetBSD: dm_ioctl.c,v 1.37 2019/12/04 15:31:12 tkusumi 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 #include <sys/cdefs.h> 32 __KERNEL_RCSID(0, "$NetBSD: dm_ioctl.c,v 1.37 2019/12/04 15:31:12 tkusumi Exp $"); 33 34 /* 35 * Locking is used to synchronise between ioctl calls and between dm_table's 36 * users. 37 * 38 * ioctl locking: 39 * Simple reference counting, to count users of device will be used routines 40 * dm_dev_busy/dm_dev_unbusy are used for that. 41 * dm_dev_lookup/dm_dev_rem call dm_dev_busy before return(caller is therefore 42 * holder of reference_counter last). 43 * 44 * ioctl routines which change/remove dm_dev parameters must wait on 45 * dm_dev::dev_cv and when last user will call dm_dev_unbusy they will wake 46 * up them. 47 * 48 * table_head locking: 49 * To access table entries dm_table_* routines must be used. 50 * 51 * dm_table_get_entry will increment table users reference 52 * counter. It will return active or inactive table depends 53 * on uint8_t argument. 54 * 55 * dm_table_release must be called for every table_entry from 56 * dm_table_get_entry. Between these to calls tables can'tbe switched 57 * or destroyed. 58 * 59 * dm_table_head_init initialize talbe_entries SLISTS and io_cv. 60 * 61 * dm_table_head_destroy destroy cv. 62 * 63 * There are two types of users for dm_table_head first type will 64 * only read list and try to do anything with it e.g. dmstrategy, 65 * dm_table_size etc. There is another user for table_head which wants 66 * to change table lists e.g. dm_dev_resume_ioctl, dm_dev_remove_ioctl, 67 * dm_table_clear_ioctl. 68 * 69 * NOTE: It is not allowed to call dm_table_destroy, dm_table_switch_tables 70 * with hold table reference counter. Table reference counter is hold 71 * after calling dm_table_get_entry routine. After calling this 72 * function user must call dm_table_release before any writer table 73 * operation. 74 * 75 * Example: dm_table_get_entry 76 * dm_table_destroy/dm_table_switch_tables 77 * This exaple will lead to deadlock situation because after dm_table_get_entry 78 * table reference counter is != 0 and dm_table_destroy have to wait on cv until 79 * reference counter is 0. 80 * 81 */ 82 83 #include <sys/types.h> 84 #include <sys/param.h> 85 86 #include <sys/device.h> 87 #include <sys/disk.h> 88 #include <sys/disklabel.h> 89 #include <sys/kmem.h> 90 #include <sys/malloc.h> 91 92 #include <machine/int_fmtio.h> 93 94 #include "netbsd-dm.h" 95 #include "dm.h" 96 97 static uint32_t sc_minor_num; 98 extern const struct dkdriver dmdkdriver; 99 uint32_t dm_dev_counter; 100 101 /* Generic cf_data for device-mapper driver */ 102 static struct cfdata dm_cfdata = { 103 .cf_name = "dm", 104 .cf_atname = "dm", 105 .cf_fstate = FSTATE_STAR, 106 .cf_unit = 0 107 }; 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 /* 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 /* 175 * Get list of all available targets from global 176 * target list and sent them back to libdevmapper. 177 */ 178 int 179 dm_list_versions_ioctl(prop_dictionary_t dm_dict) 180 { 181 prop_array_t target_list; 182 uint32_t flags; 183 184 flags = 0; 185 186 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags); 187 188 dm_dbg_print_flags(flags); 189 target_list = dm_target_prop_list(); 190 191 prop_dictionary_set(dm_dict, DM_IOCTL_CMD_DATA, target_list); 192 prop_object_release(target_list); 193 194 return 0; 195 } 196 197 /* 198 * Create in-kernel entry for device. Device attributes such as name, uuid are 199 * taken from proplib dictionary. 200 * 201 */ 202 int 203 dm_dev_create_ioctl(prop_dictionary_t dm_dict) 204 { 205 dm_dev_t *dmv; 206 const char *name, *uuid; 207 int r; 208 uint32_t flags; 209 device_t devt; 210 211 r = 0; 212 flags = 0; 213 name = NULL; 214 uuid = NULL; 215 216 /* Get needed values from dictionary. */ 217 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_NAME, &name); 218 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_UUID, &uuid); 219 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags); 220 221 dm_dbg_print_flags(flags); 222 223 /* Lookup name and uuid if device already exist quit. */ 224 if ((dmv = dm_dev_lookup(name, uuid, -1)) != NULL) { 225 DM_ADD_FLAG(flags, DM_EXISTS_FLAG); /* Device already exists */ 226 dm_dev_unbusy(dmv); 227 return EEXIST; 228 } 229 if ((devt = config_attach_pseudo(&dm_cfdata)) == NULL) { 230 aprint_error("Unable to attach pseudo device dm/%s\n", name); 231 return (ENOMEM); 232 } 233 if ((dmv = dm_dev_alloc()) == NULL) 234 return ENOMEM; 235 236 if (uuid) 237 strncpy(dmv->uuid, uuid, DM_UUID_LEN); 238 else 239 dmv->uuid[0] = '\0'; 240 241 if (name) 242 strlcpy(dmv->name, name, DM_NAME_LEN); 243 244 dmv->minor = (uint64_t)atomic_inc_32_nv(&sc_minor_num); 245 dmv->flags = 0; /* device flags are set when needed */ 246 dmv->ref_cnt = 0; 247 dmv->event_nr = 0; 248 dmv->devt = devt; 249 250 dm_table_head_init(&dmv->table_head); 251 252 mutex_init(&dmv->dev_mtx, MUTEX_DEFAULT, IPL_NONE); 253 mutex_init(&dmv->diskp_mtx, MUTEX_DEFAULT, IPL_NONE); 254 cv_init(&dmv->dev_cv, "dm_dev"); 255 256 if (flags & DM_READONLY_FLAG) 257 dmv->flags |= DM_READONLY_FLAG; 258 259 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_MINOR, dmv->minor); 260 261 disk_init(dmv->diskp, dmv->name, &dmdkdriver); 262 disk_attach(dmv->diskp); 263 264 dmv->diskp->dk_info = NULL; 265 266 if ((r = dm_dev_insert(dmv)) != 0) 267 dm_dev_free(dmv); 268 269 DM_ADD_FLAG(flags, DM_EXISTS_FLAG); 270 DM_REMOVE_FLAG(flags, DM_INACTIVE_PRESENT_FLAG); 271 272 /* Increment device counter After creating device */ 273 atomic_inc_32(&dm_dev_counter); 274 275 return r; 276 } 277 278 /* 279 * Get list of created device-mapper devices fromglobal list and 280 * send it to kernel. 281 * 282 * Output dictionary: 283 * 284 * <key>cmd_data</key> 285 * <array> 286 * <dict> 287 * <key>name<key> 288 * <string>...</string> 289 * 290 * <key>dev</key> 291 * <integer>...</integer> 292 * </dict> 293 * </array> 294 * 295 */ 296 int 297 dm_dev_list_ioctl(prop_dictionary_t dm_dict) 298 { 299 prop_array_t dev_list; 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 /* 317 * Rename selected devices old name is in struct dm_ioctl. 318 * newname is taken from dictionary 319 * 320 * <key>cmd_data</key> 321 * <array> 322 * <string>...</string> 323 * </array> 324 */ 325 int 326 dm_dev_rename_ioctl(prop_dictionary_t dm_dict) 327 { 328 prop_array_t cmd_array; 329 dm_dev_t *dmv; 330 331 const char *name, *uuid, *n_name; 332 uint32_t flags, minor; 333 334 name = NULL; 335 uuid = NULL; 336 minor = 0; 337 338 /* Get needed values from dictionary. */ 339 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_NAME, &name); 340 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_UUID, &uuid); 341 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags); 342 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_MINOR, &minor); 343 344 dm_dbg_print_flags(flags); 345 346 cmd_array = prop_dictionary_get(dm_dict, DM_IOCTL_CMD_DATA); 347 348 prop_array_get_cstring_nocopy(cmd_array, 0, &n_name); 349 350 if (strlen(n_name) + 1 > DM_NAME_LEN) 351 return EINVAL; 352 353 if ((dmv = dm_dev_rem(name, uuid, minor)) == NULL) { 354 DM_REMOVE_FLAG(flags, DM_EXISTS_FLAG); 355 return ENOENT; 356 } 357 /* change device name */ 358 /* 359 * XXX How to deal with this change, name only used in 360 * dm_dev_routines, should I add dm_dev_change_name which will run 361 * under the dm_dev_list mutex ? 362 */ 363 strlcpy(dmv->name, n_name, DM_NAME_LEN); 364 365 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_OPEN, dmv->table_head.io_cnt); 366 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_MINOR, dmv->minor); 367 prop_dictionary_set_cstring(dm_dict, DM_IOCTL_UUID, dmv->uuid); 368 369 dm_dev_insert(dmv); 370 371 return 0; 372 } 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 device_t devt; 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 devt = dmv->devt; 407 408 dm_dev_unbusy(dmv); 409 410 /* 411 * This will call dm_detach routine which will actually removes 412 * device. 413 */ 414 return config_detach(devt, DETACH_QUIET); 415 } 416 417 /* 418 * Return actual state of device to libdevmapper. 419 */ 420 int 421 dm_dev_status_ioctl(prop_dictionary_t dm_dict) 422 { 423 dm_dev_t *dmv; 424 const char *name, *uuid; 425 uint32_t flags, j, minor; 426 427 name = NULL; 428 uuid = NULL; 429 flags = 0; 430 j = 0; 431 432 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_NAME, &name); 433 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_UUID, &uuid); 434 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags); 435 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_MINOR, &minor); 436 437 if ((dmv = dm_dev_lookup(name, uuid, minor)) == NULL) { 438 DM_REMOVE_FLAG(flags, DM_EXISTS_FLAG); 439 return ENOENT; 440 } 441 dm_dbg_print_flags(dmv->flags); 442 443 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_OPEN, dmv->table_head.io_cnt); 444 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_MINOR, dmv->minor); 445 prop_dictionary_set_cstring(dm_dict, DM_IOCTL_UUID, dmv->uuid); 446 447 if (dmv->flags & DM_SUSPEND_FLAG) 448 DM_ADD_FLAG(flags, DM_SUSPEND_FLAG); 449 450 /* 451 * Add status flags for tables I have to check both active and 452 * inactive tables. 453 */ 454 if ((j = dm_table_get_target_count(&dmv->table_head, DM_TABLE_ACTIVE))) 455 DM_ADD_FLAG(flags, DM_ACTIVE_PRESENT_FLAG); 456 else 457 DM_REMOVE_FLAG(flags, DM_ACTIVE_PRESENT_FLAG); 458 459 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_TARGET_COUNT, j); 460 461 if (dm_table_get_target_count(&dmv->table_head, DM_TABLE_INACTIVE)) 462 DM_ADD_FLAG(flags, DM_INACTIVE_PRESENT_FLAG); 463 else 464 DM_REMOVE_FLAG(flags, DM_INACTIVE_PRESENT_FLAG); 465 466 dm_dev_unbusy(dmv); 467 468 return 0; 469 } 470 471 /* 472 * Set only flag to suggest that device is suspended. This call is 473 * not supported in NetBSD. 474 * 475 */ 476 int 477 dm_dev_suspend_ioctl(prop_dictionary_t dm_dict) 478 { 479 dm_dev_t *dmv; 480 const char *name, *uuid; 481 uint32_t flags, minor; 482 483 name = NULL; 484 uuid = NULL; 485 flags = 0; 486 487 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_NAME, &name); 488 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_UUID, &uuid); 489 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags); 490 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_MINOR, &minor); 491 492 if ((dmv = dm_dev_lookup(name, uuid, minor)) == NULL) { 493 DM_REMOVE_FLAG(flags, DM_EXISTS_FLAG); 494 return ENOENT; 495 } 496 atomic_or_32(&dmv->flags, DM_SUSPEND_FLAG); 497 498 dm_dbg_print_flags(dmv->flags); 499 500 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_OPEN, dmv->table_head.io_cnt); 501 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_FLAGS, dmv->flags); 502 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_MINOR, dmv->minor); 503 504 dm_dev_unbusy(dmv); 505 506 /* Add flags to dictionary flag after dmv -> dict copy */ 507 DM_ADD_FLAG(flags, DM_EXISTS_FLAG); 508 509 return 0; 510 } 511 512 /* 513 * Simulate Linux behaviour better and switch tables here and not in 514 * dm_table_load_ioctl. 515 */ 516 int 517 dm_dev_resume_ioctl(prop_dictionary_t dm_dict) 518 { 519 dm_dev_t *dmv; 520 const char *name, *uuid; 521 uint32_t flags, minor; 522 523 name = NULL; 524 uuid = NULL; 525 flags = 0; 526 527 /* 528 * char *xml; xml = prop_dictionary_externalize(dm_dict); 529 * printf("%s\n",xml); 530 */ 531 532 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_NAME, &name); 533 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_UUID, &uuid); 534 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags); 535 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_MINOR, &minor); 536 537 /* Remove device from global device list */ 538 if ((dmv = dm_dev_lookup(name, uuid, minor)) == NULL) { 539 DM_REMOVE_FLAG(flags, DM_EXISTS_FLAG); 540 return ENOENT; 541 } 542 543 /* Make inactive table active, if it exists */ 544 if (dmv->flags & DM_INACTIVE_PRESENT_FLAG) 545 dm_table_switch_tables(&dmv->table_head); 546 547 atomic_and_32(&dmv->flags, ~(DM_SUSPEND_FLAG | DM_INACTIVE_PRESENT_FLAG)); 548 atomic_or_32(&dmv->flags, DM_ACTIVE_PRESENT_FLAG); 549 550 DM_ADD_FLAG(flags, DM_EXISTS_FLAG); 551 552 dmgetproperties(dmv->diskp, &dmv->table_head); 553 554 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_OPEN, dmv->table_head.io_cnt); 555 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_FLAGS, flags); 556 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_MINOR, dmv->minor); 557 558 dm_dev_unbusy(dmv); 559 560 /* Destroy inactive table after resume. */ 561 dm_table_destroy(&dmv->table_head, DM_TABLE_INACTIVE); 562 563 return 0; 564 } 565 566 /* 567 * Table management routines 568 * lvm2tools doens't send name/uuid to kernel with table 569 * for lookup I have to use minor number. 570 */ 571 572 /* 573 * Remove inactive table from device. Routines which work's with inactive tables 574 * doesn't need to synchronise with dmstrategy. They can synchronise themselves with mutex?. 575 * 576 */ 577 int 578 dm_table_clear_ioctl(prop_dictionary_t dm_dict) 579 { 580 dm_dev_t *dmv; 581 const char *name, *uuid; 582 uint32_t flags, minor; 583 584 dmv = NULL; 585 name = NULL; 586 uuid = NULL; 587 flags = 0; 588 minor = 0; 589 590 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_NAME, &name); 591 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_UUID, &uuid); 592 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags); 593 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_MINOR, &minor); 594 595 aprint_debug("Clearing inactive table from device: %s--%s\n", 596 name, uuid); 597 598 if ((dmv = dm_dev_lookup(name, uuid, minor)) == NULL) { 599 DM_REMOVE_FLAG(flags, DM_EXISTS_FLAG); 600 return ENOENT; 601 } 602 /* Select unused table */ 603 dm_table_destroy(&dmv->table_head, DM_TABLE_INACTIVE); 604 605 atomic_and_32(&dmv->flags, ~DM_INACTIVE_PRESENT_FLAG); 606 607 dm_dev_unbusy(dmv); 608 609 return 0; 610 } 611 612 /* 613 * Get list of physical devices for active table. 614 * Get dev_t from pdev vnode and insert it into cmd_array. 615 * 616 * XXX. This function is called from lvm2tools to get information 617 * about physical devices, too e.g. during vgcreate. 618 */ 619 int 620 dm_table_deps_ioctl(prop_dictionary_t dm_dict) 621 { 622 dm_dev_t *dmv; 623 dm_table_t *tbl; 624 dm_table_entry_t *table_en; 625 626 prop_array_t cmd_array; 627 const char *name, *uuid; 628 uint32_t flags, minor; 629 630 int table_type; 631 632 name = NULL; 633 uuid = NULL; 634 dmv = NULL; 635 flags = 0; 636 637 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_NAME, &name); 638 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_UUID, &uuid); 639 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags); 640 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_MINOR, &minor); 641 642 /* create array for dev_t's */ 643 cmd_array = prop_array_create(); 644 645 if ((dmv = dm_dev_lookup(name, uuid, minor)) == NULL) { 646 DM_REMOVE_FLAG(flags, DM_EXISTS_FLAG); 647 return ENOENT; 648 } 649 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_MINOR, dmv->minor); 650 prop_dictionary_set_cstring(dm_dict, DM_IOCTL_NAME, dmv->name); 651 prop_dictionary_set_cstring(dm_dict, DM_IOCTL_UUID, dmv->uuid); 652 653 aprint_debug("Getting table deps for device: %s\n", dmv->name); 654 655 /* 656 * if DM_QUERY_INACTIVE_TABLE_FLAG is passed we need to query 657 * INACTIVE TABLE 658 */ 659 if (flags & DM_QUERY_INACTIVE_TABLE_FLAG) 660 table_type = DM_TABLE_INACTIVE; 661 else 662 table_type = DM_TABLE_ACTIVE; 663 664 tbl = dm_table_get_entry(&dmv->table_head, table_type); 665 666 SLIST_FOREACH(table_en, tbl, next) 667 table_en->target->deps(table_en, cmd_array); 668 669 dm_table_release(&dmv->table_head, table_type); 670 dm_dev_unbusy(dmv); 671 672 prop_dictionary_set(dm_dict, DM_IOCTL_CMD_DATA, cmd_array); 673 prop_object_release(cmd_array); 674 675 return 0; 676 } 677 678 /* 679 * Load new table/tables to device. 680 * Call apropriate target init routine open all physical pdev's and 681 * link them to device. For other targets mirror, strip, snapshot 682 * etc. also add dependency devices to upcalls list. 683 * 684 * Load table to inactive slot table are switched in dm_device_resume_ioctl. 685 * This simulates Linux behaviour better there should not be any difference. 686 * 687 */ 688 int 689 dm_table_load_ioctl(prop_dictionary_t dm_dict) 690 { 691 dm_dev_t *dmv; 692 dm_table_entry_t *table_en, *last_table; 693 dm_table_t *tbl; 694 dm_target_t *target; 695 696 prop_object_iterator_t iter; 697 prop_array_t cmd_array; 698 prop_dictionary_t target_dict; 699 700 const char *name, *uuid, *type; 701 uint32_t flags, ret, minor; 702 char *str; 703 704 ret = 0; 705 flags = 0; 706 name = NULL; 707 uuid = NULL; 708 dmv = NULL; 709 last_table = NULL; 710 str = NULL; 711 712 /* 713 * char *xml; xml = prop_dictionary_externalize(dm_dict); 714 * printf("%s\n",xml); 715 */ 716 717 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_NAME, &name); 718 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_UUID, &uuid); 719 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags); 720 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_MINOR, &minor); 721 722 cmd_array = prop_dictionary_get(dm_dict, DM_IOCTL_CMD_DATA); 723 iter = prop_array_iterator(cmd_array); 724 dm_dbg_print_flags(flags); 725 726 if ((dmv = dm_dev_lookup(name, uuid, minor)) == NULL) { 727 DM_REMOVE_FLAG(flags, DM_EXISTS_FLAG); 728 prop_object_iterator_release(iter); 729 return ENOENT; 730 } 731 aprint_debug("Loading table to device: %s--%d\n", name, 732 dmv->table_head.cur_active_table); 733 734 /* 735 * I have to check if this table slot is not used by another table list. 736 * if it is used I should free them. 737 */ 738 if (dmv->flags & DM_INACTIVE_PRESENT_FLAG) 739 dm_table_destroy(&dmv->table_head, DM_TABLE_INACTIVE); 740 741 dm_dbg_print_flags(dmv->flags); 742 tbl = dm_table_get_entry(&dmv->table_head, DM_TABLE_INACTIVE); 743 744 aprint_debug("dmv->name = %s\n", dmv->name); 745 746 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_MINOR, dmv->minor); 747 748 while ((target_dict = prop_object_iterator_next(iter)) != NULL) { 749 prop_dictionary_get_cstring_nocopy(target_dict, 750 DM_TABLE_TYPE, &type); 751 /* 752 * If we want to deny table with 2 or more different 753 * target we should do it here 754 */ 755 if (((target = dm_target_lookup(type)) == NULL) && 756 ((target = dm_target_autoload(type)) == NULL)) { 757 dm_table_release(&dmv->table_head, DM_TABLE_INACTIVE); 758 dm_dev_unbusy(dmv); 759 prop_object_iterator_release(iter); 760 return ENOENT; 761 } 762 table_en = kmem_alloc(sizeof(dm_table_entry_t), KM_SLEEP); 763 prop_dictionary_get_uint64(target_dict, DM_TABLE_START, 764 &table_en->start); 765 prop_dictionary_get_uint64(target_dict, DM_TABLE_LENGTH, 766 &table_en->length); 767 768 table_en->target = target; 769 table_en->dm_dev = dmv; 770 table_en->target_config = NULL; 771 772 /* 773 * There is a parameter string after dm_target_spec 774 * structure which points to /dev/wd0a 284 part of 775 * table. String str points to this text. This can be 776 * null and therefore it should be checked before we try to 777 * use it. 778 */ 779 prop_dictionary_get_cstring(target_dict, 780 DM_TABLE_PARAMS, (char **) &str); 781 782 if (SLIST_EMPTY(tbl) || last_table == NULL) 783 /* insert this table to head */ 784 SLIST_INSERT_HEAD(tbl, table_en, next); 785 else 786 SLIST_INSERT_AFTER(last_table, table_en, next); 787 788 /* 789 * Params string is different for every target, 790 * therfore I have to pass it to target init 791 * routine and parse parameters there. 792 */ 793 794 if ((ret = target->init(dmv, &table_en->target_config, 795 str)) != 0) { 796 dm_table_release(&dmv->table_head, DM_TABLE_INACTIVE); 797 dm_table_destroy(&dmv->table_head, DM_TABLE_INACTIVE); 798 free(str, M_TEMP); 799 800 dm_dev_unbusy(dmv); 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 /* 818 * Get description of all tables loaded to device from kernel 819 * and send it to libdevmapper. 820 * 821 * Output dictionary for every table: 822 * 823 * <key>cmd_data</key> 824 * <array> 825 * <dict> 826 * <key>type<key> 827 * <string>...</string> 828 * 829 * <key>start</key> 830 * <integer>...</integer> 831 * 832 * <key>length</key> 833 * <integer>...</integer> 834 * 835 * <key>params</key> 836 * <string>...</string> 837 * </dict> 838 * </array> 839 * 840 */ 841 int 842 dm_table_status_ioctl(prop_dictionary_t dm_dict) 843 { 844 dm_dev_t *dmv; 845 dm_table_t *tbl; 846 dm_table_entry_t *table_en; 847 848 prop_array_t cmd_array; 849 prop_dictionary_t target_dict; 850 851 uint32_t minor, flags; 852 853 const char *name, *uuid; 854 char *params; 855 int table_type; 856 857 dmv = NULL; 858 uuid = NULL; 859 name = NULL; 860 params = NULL; 861 flags = 0; 862 863 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_NAME, &name); 864 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_UUID, &uuid); 865 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags); 866 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_MINOR, &minor); 867 868 cmd_array = prop_array_create(); 869 870 if ((dmv = dm_dev_lookup(name, uuid, minor)) == NULL) { 871 DM_REMOVE_FLAG(flags, DM_EXISTS_FLAG); 872 return ENOENT; 873 } 874 /* 875 * if DM_QUERY_INACTIVE_TABLE_FLAG is passed we need to query 876 * INACTIVE TABLE 877 */ 878 if (flags & DM_QUERY_INACTIVE_TABLE_FLAG) 879 table_type = DM_TABLE_INACTIVE; 880 else 881 table_type = DM_TABLE_ACTIVE; 882 883 if (dm_table_get_target_count(&dmv->table_head, DM_TABLE_ACTIVE)) { 884 DM_ADD_FLAG(flags, DM_ACTIVE_PRESENT_FLAG); 885 } else { 886 DM_REMOVE_FLAG(flags, DM_ACTIVE_PRESENT_FLAG); 887 888 if (dm_table_get_target_count(&dmv->table_head, DM_TABLE_INACTIVE)) 889 DM_ADD_FLAG(flags, DM_INACTIVE_PRESENT_FLAG); 890 else 891 DM_REMOVE_FLAG(flags, DM_INACTIVE_PRESENT_FLAG); 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 /* 923 * Explicitly clear DM_TABLE_PARAMS to prevent dmsetup(8) from 924 * printing junk when DM_TABLE_PARAMS was never initialized. 925 */ 926 prop_dictionary_set_cstring(target_dict, DM_TABLE_PARAMS, ""); 927 928 if (flags & DM_STATUS_TABLE_FLAG) { 929 params = table_en->target->status 930 (table_en->target_config); 931 932 if (params != NULL) { 933 prop_dictionary_set_cstring(target_dict, 934 DM_TABLE_PARAMS, params); 935 936 kmem_free(params, DM_MAX_PARAMS_SIZE); 937 } 938 } 939 prop_array_add(cmd_array, target_dict); 940 prop_object_release(target_dict); 941 } 942 943 dm_table_release(&dmv->table_head, table_type); 944 dm_dev_unbusy(dmv); 945 946 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_FLAGS, flags); 947 prop_dictionary_set(dm_dict, DM_IOCTL_CMD_DATA, cmd_array); 948 prop_object_release(cmd_array); 949 950 return 0; 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 uint32_t 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
Indexes created Tue Sep 30 20:09:53 GMT 2025