dm_ioctl.c revision 1.35
1 /* $NetBSD: dm_ioctl.c,v 1.35 2019/12/01 06:53:31 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 1.35 2019/12/01 06:53:31 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 #include <sys/vnode.h> 92 93 #include <machine/int_fmtio.h> 94 95 #include "netbsd-dm.h" 96 #include "dm.h" 97 98 static uint32_t sc_minor_num; 99 extern const struct dkdriver dmdkdriver; 100 uint32_t dm_dev_counter; 101 102 /* Generic cf_data for device-mapper driver */ 103 static struct cfdata dm_cfdata = { 104 .cf_name = "dm", 105 .cf_atname = "dm", 106 .cf_fstate = FSTATE_STAR, 107 .cf_unit = 0 108 }; 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 /* 165 * Get version ioctl call I do it as default therefore this 166 * function is unused now. 167 */ 168 int 169 dm_get_version_ioctl(prop_dictionary_t dm_dict) 170 { 171 172 return 0; 173 } 174 175 /* 176 * Get list of all available targets from global 177 * target list and sent them back to libdevmapper. 178 */ 179 int 180 dm_list_versions_ioctl(prop_dictionary_t dm_dict) 181 { 182 prop_array_t target_list; 183 uint32_t flags; 184 185 flags = 0; 186 187 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags); 188 189 dm_dbg_print_flags(flags); 190 target_list = dm_target_prop_list(); 191 192 prop_dictionary_set(dm_dict, DM_IOCTL_CMD_DATA, target_list); 193 prop_object_release(target_list); 194 195 return 0; 196 } 197 198 /* 199 * Create in-kernel entry for device. Device attributes such as name, uuid are 200 * taken from proplib dictionary. 201 * 202 */ 203 int 204 dm_dev_create_ioctl(prop_dictionary_t dm_dict) 205 { 206 dm_dev_t *dmv; 207 const char *name, *uuid; 208 int r; 209 uint32_t flags; 210 device_t devt; 211 212 r = 0; 213 flags = 0; 214 name = NULL; 215 uuid = NULL; 216 217 /* Get needed values from dictionary. */ 218 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_NAME, &name); 219 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_UUID, &uuid); 220 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags); 221 222 dm_dbg_print_flags(flags); 223 224 /* Lookup name and uuid if device already exist quit. */ 225 if ((dmv = dm_dev_lookup(name, uuid, -1)) != NULL) { 226 DM_ADD_FLAG(flags, DM_EXISTS_FLAG); /* Device already exists */ 227 dm_dev_unbusy(dmv); 228 return EEXIST; 229 } 230 if ((devt = config_attach_pseudo(&dm_cfdata)) == NULL) { 231 aprint_error("Unable to attach pseudo device dm/%s\n", name); 232 return (ENOMEM); 233 } 234 if ((dmv = dm_dev_alloc()) == NULL) 235 return ENOMEM; 236 237 if (uuid) 238 strncpy(dmv->uuid, uuid, DM_UUID_LEN); 239 else 240 dmv->uuid[0] = '\0'; 241 242 if (name) 243 strlcpy(dmv->name, name, DM_NAME_LEN); 244 245 dmv->minor = (uint64_t)atomic_inc_32_nv(&sc_minor_num); 246 dmv->flags = 0; /* device flags are set when needed */ 247 dmv->ref_cnt = 0; 248 dmv->event_nr = 0; 249 dmv->devt = devt; 250 251 dm_table_head_init(&dmv->table_head); 252 253 mutex_init(&dmv->dev_mtx, MUTEX_DEFAULT, IPL_NONE); 254 mutex_init(&dmv->diskp_mtx, MUTEX_DEFAULT, IPL_NONE); 255 cv_init(&dmv->dev_cv, "dm_dev"); 256 257 if (flags & DM_READONLY_FLAG) 258 dmv->flags |= DM_READONLY_FLAG; 259 260 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_MINOR, dmv->minor); 261 262 disk_init(dmv->diskp, dmv->name, &dmdkdriver); 263 disk_attach(dmv->diskp); 264 265 dmv->diskp->dk_info = NULL; 266 267 if ((r = dm_dev_insert(dmv)) != 0) 268 dm_dev_free(dmv); 269 270 DM_ADD_FLAG(flags, DM_EXISTS_FLAG); 271 DM_REMOVE_FLAG(flags, DM_INACTIVE_PRESENT_FLAG); 272 273 /* Increment device counter After creating device */ 274 atomic_inc_32(&dm_dev_counter); 275 276 return r; 277 } 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 /* 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 /* 377 * Remove device from global list I have to remove active 378 * and inactive tables first. 379 */ 380 int 381 dm_dev_remove_ioctl(prop_dictionary_t dm_dict) 382 { 383 dm_dev_t *dmv; 384 const char *name, *uuid; 385 uint32_t flags, minor; 386 device_t devt; 387 388 flags = 0; 389 name = NULL; 390 uuid = NULL; 391 392 /* Get needed values from dictionary. */ 393 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_NAME, &name); 394 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_UUID, &uuid); 395 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags); 396 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_MINOR, &minor); 397 398 dm_dbg_print_flags(flags); 399 400 /* 401 * This seems as hack to me, probably use routine dm_dev_get_devt to 402 * atomicaly get devt from device. 403 */ 404 if ((dmv = dm_dev_lookup(name, uuid, minor)) == NULL) { 405 DM_REMOVE_FLAG(flags, DM_EXISTS_FLAG); 406 return ENOENT; 407 } 408 devt = dmv->devt; 409 410 dm_dev_unbusy(dmv); 411 412 /* 413 * This will call dm_detach routine which will actually removes 414 * device. 415 */ 416 return config_detach(devt, DETACH_QUIET); 417 } 418 419 /* 420 * Return actual state of device to libdevmapper. 421 */ 422 int 423 dm_dev_status_ioctl(prop_dictionary_t dm_dict) 424 { 425 dm_dev_t *dmv; 426 const char *name, *uuid; 427 uint32_t flags, j, minor; 428 429 name = NULL; 430 uuid = NULL; 431 flags = 0; 432 j = 0; 433 434 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_NAME, &name); 435 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_UUID, &uuid); 436 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags); 437 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_MINOR, &minor); 438 439 if ((dmv = dm_dev_lookup(name, uuid, minor)) == NULL) { 440 DM_REMOVE_FLAG(flags, DM_EXISTS_FLAG); 441 return ENOENT; 442 } 443 dm_dbg_print_flags(dmv->flags); 444 445 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_OPEN, dmv->table_head.io_cnt); 446 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_MINOR, dmv->minor); 447 prop_dictionary_set_cstring(dm_dict, DM_IOCTL_UUID, dmv->uuid); 448 449 if (dmv->flags & DM_SUSPEND_FLAG) 450 DM_ADD_FLAG(flags, DM_SUSPEND_FLAG); 451 452 /* 453 * Add status flags for tables I have to check both active and 454 * inactive tables. 455 */ 456 if ((j = dm_table_get_target_count(&dmv->table_head, DM_TABLE_ACTIVE))) { 457 DM_ADD_FLAG(flags, DM_ACTIVE_PRESENT_FLAG); 458 } else 459 DM_REMOVE_FLAG(flags, DM_ACTIVE_PRESENT_FLAG); 460 461 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_TARGET_COUNT, j); 462 463 if (dm_table_get_target_count(&dmv->table_head, DM_TABLE_INACTIVE)) 464 DM_ADD_FLAG(flags, DM_INACTIVE_PRESENT_FLAG); 465 else 466 DM_REMOVE_FLAG(flags, DM_INACTIVE_PRESENT_FLAG); 467 468 dm_dev_unbusy(dmv); 469 470 return 0; 471 } 472 473 /* 474 * Set only flag to suggest that device is suspended. This call is 475 * not supported in NetBSD. 476 * 477 */ 478 int 479 dm_dev_suspend_ioctl(prop_dictionary_t dm_dict) 480 { 481 dm_dev_t *dmv; 482 const char *name, *uuid; 483 uint32_t flags, minor; 484 485 name = NULL; 486 uuid = NULL; 487 flags = 0; 488 489 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_NAME, &name); 490 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_UUID, &uuid); 491 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags); 492 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_MINOR, &minor); 493 494 if ((dmv = dm_dev_lookup(name, uuid, minor)) == NULL) { 495 DM_REMOVE_FLAG(flags, DM_EXISTS_FLAG); 496 return ENOENT; 497 } 498 atomic_or_32(&dmv->flags, DM_SUSPEND_FLAG); 499 500 dm_dbg_print_flags(dmv->flags); 501 502 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_OPEN, dmv->table_head.io_cnt); 503 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_FLAGS, dmv->flags); 504 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_MINOR, dmv->minor); 505 506 dm_dev_unbusy(dmv); 507 508 /* Add flags to dictionary flag after dmv -> dict copy */ 509 DM_ADD_FLAG(flags, DM_EXISTS_FLAG); 510 511 return 0; 512 } 513 514 /* 515 * Simulate Linux behaviour better and switch tables here and not in 516 * dm_table_load_ioctl. 517 */ 518 int 519 dm_dev_resume_ioctl(prop_dictionary_t dm_dict) 520 { 521 dm_dev_t *dmv; 522 const char *name, *uuid; 523 uint32_t flags, minor; 524 525 name = NULL; 526 uuid = NULL; 527 flags = 0; 528 529 /* 530 * char *xml; xml = prop_dictionary_externalize(dm_dict); 531 * printf("%s\n",xml); 532 */ 533 534 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_NAME, &name); 535 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_UUID, &uuid); 536 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags); 537 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_MINOR, &minor); 538 539 /* Remove device from global device list */ 540 if ((dmv = dm_dev_lookup(name, uuid, minor)) == NULL) { 541 DM_REMOVE_FLAG(flags, DM_EXISTS_FLAG); 542 return ENOENT; 543 } 544 545 /* Make inactive table active, if it exists */ 546 if (dmv->flags & DM_INACTIVE_PRESENT_FLAG) 547 dm_table_switch_tables(&dmv->table_head); 548 549 atomic_and_32(&dmv->flags, ~(DM_SUSPEND_FLAG | DM_INACTIVE_PRESENT_FLAG)); 550 atomic_or_32(&dmv->flags, DM_ACTIVE_PRESENT_FLAG); 551 552 DM_ADD_FLAG(flags, DM_EXISTS_FLAG); 553 554 dmgetproperties(dmv->diskp, &dmv->table_head); 555 556 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_OPEN, dmv->table_head.io_cnt); 557 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_FLAGS, flags); 558 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_MINOR, dmv->minor); 559 560 dm_dev_unbusy(dmv); 561 562 /* Destroy inactive table after resume. */ 563 dm_table_destroy(&dmv->table_head, DM_TABLE_INACTIVE); 564 565 return 0; 566 } 567 568 /* 569 * Table management routines 570 * lvm2tools doens't send name/uuid to kernel with table 571 * for lookup I have to use minor number. 572 */ 573 574 /* 575 * Remove inactive table from device. Routines which work's with inactive tables 576 * doesn't need to synchronise with dmstrategy. They can synchronise themselves with mutex?. 577 * 578 */ 579 int 580 dm_table_clear_ioctl(prop_dictionary_t dm_dict) 581 { 582 dm_dev_t *dmv; 583 const char *name, *uuid; 584 uint32_t flags, minor; 585 586 dmv = NULL; 587 name = NULL; 588 uuid = NULL; 589 flags = 0; 590 minor = 0; 591 592 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_NAME, &name); 593 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_UUID, &uuid); 594 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags); 595 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_MINOR, &minor); 596 597 aprint_debug("Clearing inactive table from device: %s--%s\n", 598 name, uuid); 599 600 if ((dmv = dm_dev_lookup(name, uuid, minor)) == NULL) { 601 DM_REMOVE_FLAG(flags, DM_EXISTS_FLAG); 602 return ENOENT; 603 } 604 /* Select unused table */ 605 dm_table_destroy(&dmv->table_head, DM_TABLE_INACTIVE); 606 607 atomic_and_32(&dmv->flags, ~DM_INACTIVE_PRESENT_FLAG); 608 609 dm_dev_unbusy(dmv); 610 611 return 0; 612 } 613 614 /* 615 * Get list of physical devices for active table. 616 * Get dev_t from pdev vnode and insert it into cmd_array. 617 * 618 * XXX. This function is called from lvm2tools to get information 619 * about physical devices, too e.g. during vgcreate. 620 */ 621 int 622 dm_table_deps_ioctl(prop_dictionary_t dm_dict) 623 { 624 dm_dev_t *dmv; 625 dm_table_t *tbl; 626 dm_table_entry_t *table_en; 627 628 prop_array_t cmd_array; 629 const char *name, *uuid; 630 uint32_t flags, minor; 631 632 int table_type; 633 634 name = NULL; 635 uuid = NULL; 636 dmv = NULL; 637 flags = 0; 638 639 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_NAME, &name); 640 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_UUID, &uuid); 641 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags); 642 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_MINOR, &minor); 643 644 /* create array for dev_t's */ 645 cmd_array = prop_array_create(); 646 647 if ((dmv = dm_dev_lookup(name, uuid, minor)) == NULL) { 648 DM_REMOVE_FLAG(flags, DM_EXISTS_FLAG); 649 return ENOENT; 650 } 651 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_MINOR, dmv->minor); 652 prop_dictionary_set_cstring(dm_dict, DM_IOCTL_NAME, dmv->name); 653 prop_dictionary_set_cstring(dm_dict, DM_IOCTL_UUID, dmv->uuid); 654 655 aprint_debug("Getting table deps for device: %s\n", dmv->name); 656 657 /* 658 * if DM_QUERY_INACTIVE_TABLE_FLAG is passed we need to query 659 * INACTIVE TABLE 660 */ 661 if (flags & DM_QUERY_INACTIVE_TABLE_FLAG) 662 table_type = DM_TABLE_INACTIVE; 663 else 664 table_type = DM_TABLE_ACTIVE; 665 666 tbl = dm_table_get_entry(&dmv->table_head, table_type); 667 668 SLIST_FOREACH(table_en, tbl, next) 669 table_en->target->deps(table_en, cmd_array); 670 671 dm_table_release(&dmv->table_head, table_type); 672 dm_dev_unbusy(dmv); 673 674 prop_dictionary_set(dm_dict, DM_IOCTL_CMD_DATA, cmd_array); 675 prop_object_release(cmd_array); 676 677 return 0; 678 } 679 680 /* 681 * Load new table/tables to device. 682 * Call apropriate target init routine open all physical pdev's and 683 * link them to device. For other targets mirror, strip, snapshot 684 * etc. also add dependency devices to upcalls list. 685 * 686 * Load table to inactive slot table are switched in dm_device_resume_ioctl. 687 * This simulates Linux behaviour better there should not be any difference. 688 * 689 */ 690 int 691 dm_table_load_ioctl(prop_dictionary_t dm_dict) 692 { 693 dm_dev_t *dmv; 694 dm_table_entry_t *table_en, *last_table; 695 dm_table_t *tbl; 696 dm_target_t *target; 697 698 prop_object_iterator_t iter; 699 prop_array_t cmd_array; 700 prop_dictionary_t target_dict; 701 702 const char *name, *uuid, *type; 703 704 uint32_t flags, ret, minor; 705 706 char *str; 707 708 ret = 0; 709 flags = 0; 710 name = NULL; 711 uuid = NULL; 712 dmv = NULL; 713 last_table = NULL; 714 str = NULL; 715 716 /* 717 * char *xml; xml = prop_dictionary_externalize(dm_dict); 718 * printf("%s\n",xml); 719 */ 720 721 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_NAME, &name); 722 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_UUID, &uuid); 723 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags); 724 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_MINOR, &minor); 725 726 cmd_array = prop_dictionary_get(dm_dict, DM_IOCTL_CMD_DATA); 727 iter = prop_array_iterator(cmd_array); 728 dm_dbg_print_flags(flags); 729 730 if ((dmv = dm_dev_lookup(name, uuid, minor)) == NULL) { 731 DM_REMOVE_FLAG(flags, DM_EXISTS_FLAG); 732 prop_object_iterator_release(iter); 733 return ENOENT; 734 } 735 aprint_debug("Loading table to device: %s--%d\n", name, 736 dmv->table_head.cur_active_table); 737 738 /* 739 * I have to check if this table slot is not used by another table list. 740 * if it is used I should free them. 741 */ 742 if (dmv->flags & DM_INACTIVE_PRESENT_FLAG) 743 dm_table_destroy(&dmv->table_head, DM_TABLE_INACTIVE); 744 745 dm_dbg_print_flags(dmv->flags); 746 tbl = dm_table_get_entry(&dmv->table_head, DM_TABLE_INACTIVE); 747 748 aprint_debug("dmv->name = %s\n", dmv->name); 749 750 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_MINOR, dmv->minor); 751 752 while ((target_dict = prop_object_iterator_next(iter)) != NULL) { 753 754 prop_dictionary_get_cstring_nocopy(target_dict, 755 DM_TABLE_TYPE, &type); 756 /* 757 * If we want to deny table with 2 or more different 758 * target we should do it here 759 */ 760 if (((target = dm_target_lookup(type)) == NULL) && 761 ((target = dm_target_autoload(type)) == NULL)) { 762 dm_table_release(&dmv->table_head, DM_TABLE_INACTIVE); 763 dm_dev_unbusy(dmv); 764 prop_object_iterator_release(iter); 765 return ENOENT; 766 } 767 table_en = kmem_alloc(sizeof(dm_table_entry_t), KM_SLEEP); 768 prop_dictionary_get_uint64(target_dict, DM_TABLE_START, 769 &table_en->start); 770 prop_dictionary_get_uint64(target_dict, DM_TABLE_LENGTH, 771 &table_en->length); 772 773 table_en->target = target; 774 table_en->dm_dev = dmv; 775 table_en->target_config = NULL; 776 777 /* 778 * There is a parameter string after dm_target_spec 779 * structure which points to /dev/wd0a 284 part of 780 * table. String str points to this text. This can be 781 * null and therefore it should be checked before we try to 782 * use it. 783 */ 784 prop_dictionary_get_cstring(target_dict, 785 DM_TABLE_PARAMS, (char **) &str); 786 787 if (SLIST_EMPTY(tbl) || last_table == NULL) 788 /* insert this table to head */ 789 SLIST_INSERT_HEAD(tbl, table_en, next); 790 else 791 SLIST_INSERT_AFTER(last_table, table_en, next); 792 793 /* 794 * Params string is different for every target, 795 * therfore I have to pass it to target init 796 * routine and parse parameters there. 797 */ 798 799 if ((ret = target->init(dmv, &table_en->target_config, 800 str)) != 0) { 801 802 dm_table_release(&dmv->table_head, DM_TABLE_INACTIVE); 803 dm_table_destroy(&dmv->table_head, DM_TABLE_INACTIVE); 804 free(str, M_TEMP); 805 806 dm_dev_unbusy(dmv); 807 prop_object_iterator_release(iter); 808 return ret; 809 } 810 last_table = table_en; 811 free(str, M_TEMP); 812 } 813 prop_object_iterator_release(iter); 814 815 DM_ADD_FLAG(flags, DM_INACTIVE_PRESENT_FLAG); 816 atomic_or_32(&dmv->flags, DM_INACTIVE_PRESENT_FLAG); 817 818 dm_table_release(&dmv->table_head, DM_TABLE_INACTIVE); 819 dm_dev_unbusy(dmv); 820 return 0; 821 } 822 823 /* 824 * Get description of all tables loaded to device from kernel 825 * and send it to libdevmapper. 826 * 827 * Output dictionary for every table: 828 * 829 * <key>cmd_data</key> 830 * <array> 831 * <dict> 832 * <key>type<key> 833 * <string>...</string> 834 * 835 * <key>start</key> 836 * <integer>...</integer> 837 * 838 * <key>length</key> 839 * <integer>...</integer> 840 * 841 * <key>params</key> 842 * <string>...</string> 843 * </dict> 844 * </array> 845 * 846 */ 847 int 848 dm_table_status_ioctl(prop_dictionary_t dm_dict) 849 { 850 dm_dev_t *dmv; 851 dm_table_t *tbl; 852 dm_table_entry_t *table_en; 853 854 prop_array_t cmd_array; 855 prop_dictionary_t target_dict; 856 857 uint32_t minor, flags; 858 859 const char *name, *uuid; 860 char *params; 861 int table_type; 862 863 dmv = NULL; 864 uuid = NULL; 865 name = NULL; 866 params = NULL; 867 flags = 0; 868 869 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_NAME, &name); 870 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_UUID, &uuid); 871 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags); 872 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_MINOR, &minor); 873 874 cmd_array = prop_array_create(); 875 876 if ((dmv = dm_dev_lookup(name, uuid, minor)) == NULL) { 877 DM_REMOVE_FLAG(flags, DM_EXISTS_FLAG); 878 return ENOENT; 879 } 880 /* 881 * if DM_QUERY_INACTIVE_TABLE_FLAG is passed we need to query 882 * INACTIVE TABLE 883 */ 884 if (flags & DM_QUERY_INACTIVE_TABLE_FLAG) 885 table_type = DM_TABLE_INACTIVE; 886 else 887 table_type = DM_TABLE_ACTIVE; 888 889 if (dm_table_get_target_count(&dmv->table_head, DM_TABLE_ACTIVE)) 890 DM_ADD_FLAG(flags, DM_ACTIVE_PRESENT_FLAG); 891 else { 892 DM_REMOVE_FLAG(flags, DM_ACTIVE_PRESENT_FLAG); 893 894 if (dm_table_get_target_count(&dmv->table_head, DM_TABLE_INACTIVE)) 895 DM_ADD_FLAG(flags, DM_INACTIVE_PRESENT_FLAG); 896 else { 897 DM_REMOVE_FLAG(flags, DM_INACTIVE_PRESENT_FLAG); 898 } 899 } 900 901 if (dmv->flags & DM_SUSPEND_FLAG) 902 DM_ADD_FLAG(flags, DM_SUSPEND_FLAG); 903 904 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_MINOR, dmv->minor); 905 906 aprint_debug("Status of device tables: %s--%d\n", 907 name, dmv->table_head.cur_active_table); 908 909 tbl = dm_table_get_entry(&dmv->table_head, table_type); 910 911 SLIST_FOREACH(table_en, tbl, next) { 912 target_dict = prop_dictionary_create(); 913 aprint_debug("%016" PRIu64 ", length %016" PRIu64 914 ", target %s\n", table_en->start, table_en->length, 915 table_en->target->name); 916 917 prop_dictionary_set_uint64(target_dict, DM_TABLE_START, 918 table_en->start); 919 prop_dictionary_set_uint64(target_dict, DM_TABLE_LENGTH, 920 table_en->length); 921 922 prop_dictionary_set_cstring(target_dict, DM_TABLE_TYPE, 923 table_en->target->name); 924 925 /* dm_table_get_cur_actv.table ?? */ 926 prop_dictionary_set_int32(target_dict, DM_TABLE_STAT, 927 dmv->table_head.cur_active_table); 928 929 /* 930 * Explicitly clear DM_TABLE_PARAMS to prevent dmsetup(8) from 931 * printing junk when DM_TABLE_PARAMS was never initialized. 932 */ 933 prop_dictionary_set_cstring(target_dict, DM_TABLE_PARAMS, ""); 934 935 if (flags & DM_STATUS_TABLE_FLAG) { 936 params = table_en->target->status 937 (table_en->target_config); 938 939 if (params != NULL) { 940 prop_dictionary_set_cstring(target_dict, 941 DM_TABLE_PARAMS, params); 942 943 kmem_free(params, DM_MAX_PARAMS_SIZE); 944 } 945 } 946 prop_array_add(cmd_array, target_dict); 947 prop_object_release(target_dict); 948 } 949 950 dm_table_release(&dmv->table_head, table_type); 951 dm_dev_unbusy(dmv); 952 953 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_FLAGS, flags); 954 prop_dictionary_set(dm_dict, DM_IOCTL_CMD_DATA, cmd_array); 955 prop_object_release(cmd_array); 956 957 return 0; 958 } 959 960 /* 961 * For every call I have to set kernel driver version. 962 * Because I can have commands supported only in other 963 * newer/later version. This routine is called for every 964 * ioctl command. 965 */ 966 int 967 dm_check_version(prop_dictionary_t dm_dict) 968 { 969 size_t i; 970 uint32_t dm_version[3]; 971 prop_array_t ver; 972 973 ver = prop_dictionary_get(dm_dict, DM_IOCTL_VERSION); 974 975 for (i = 0; i < 3; i++) 976 prop_array_get_uint32(ver, i, &dm_version[i]); 977 978 if (DM_VERSION_MAJOR != dm_version[0] || DM_VERSION_MINOR < dm_version[1]) { 979 aprint_debug("libdevmapper/kernel version mismatch " 980 "kernel: %d.%d.%d libdevmapper: %d.%d.%d\n", 981 DM_VERSION_MAJOR, DM_VERSION_MINOR, DM_VERSION_PATCHLEVEL, 982 dm_version[0], dm_version[1], dm_version[2]); 983 984 return EIO; 985 } 986 prop_array_set_uint32(ver, 0, DM_VERSION_MAJOR); 987 prop_array_set_uint32(ver, 1, DM_VERSION_MINOR); 988 prop_array_set_uint32(ver, 2, DM_VERSION_PATCHLEVEL); 989 990 prop_dictionary_set(dm_dict, DM_IOCTL_VERSION, ver); 991 992 return 0; 993 } 994
Indexes created Tue Sep 30 20:09:53 GMT 2025