dm_ioctl.c revision 1.1.2.21
1 /* $NetBSD: dm_ioctl.c,v 1.1.2.21 2008/11/02 00:02:32 haad Exp $ */ 2 3 /* 4 * Copyright (c) 1996, 1997, 1998, 1999, 2002 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 depedns 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/disklabel.h> 85 #include <sys/kmem.h> 86 #include <sys/vnode.h> 87 88 #include <machine/int_fmtio.h> 89 90 #include "netbsd-dm.h" 91 #include "dm.h" 92 93 static uint32_t sc_minor_num; 94 95 #define DM_REMOVE_FLAG(flag, name) do { \ 96 prop_dictionary_get_uint32(dm_dict,DM_IOCTL_FLAGS,&flag); \ 97 flag &= ~name; \ 98 prop_dictionary_set_uint32(dm_dict,DM_IOCTL_FLAGS,flag); \ 99 } while (/*CONSTCOND*/0) 100 101 #define DM_ADD_FLAG(flag, name) do { \ 102 prop_dictionary_get_uint32(dm_dict,DM_IOCTL_FLAGS,&flag); \ 103 flag |= name; \ 104 prop_dictionary_set_uint32(dm_dict,DM_IOCTL_FLAGS,flag); \ 105 } while (/*CONSTCOND*/0) 106 107 static int dm_dbg_print_flags(int); 108 109 /* 110 * Print flags sent to the kernel from libevmapper. 111 */ 112 static int 113 dm_dbg_print_flags(int flags) 114 { 115 aprint_normal("dbg_print --- %d\n",flags); 116 117 if (flags & DM_READONLY_FLAG) 118 aprint_normal("dbg_flags: DM_READONLY_FLAG set In/Out\n"); 119 120 if (flags & DM_SUSPEND_FLAG) 121 aprint_normal("dbg_flags: DM_SUSPEND_FLAG set In/Out \n"); 122 123 if (flags & DM_PERSISTENT_DEV_FLAG) 124 aprint_normal("db_flags: DM_PERSISTENT_DEV_FLAG set In\n"); 125 126 if (flags & DM_STATUS_TABLE_FLAG) 127 aprint_normal("dbg_flags: DM_STATUS_TABLE_FLAG set In\n"); 128 129 if (flags & DM_ACTIVE_PRESENT_FLAG) 130 aprint_normal("dbg_flags: DM_ACTIVE_PRESENT_FLAG set Out\n"); 131 132 if (flags & DM_INACTIVE_PRESENT_FLAG) 133 aprint_normal("dbg_flags: DM_INACTIVE_PRESENT_FLAG set Out\n"); 134 135 if (flags & DM_BUFFER_FULL_FLAG) 136 aprint_normal("dbg_flags: DM_BUFFER_FULL_FLAG set Out\n"); 137 138 if (flags & DM_SKIP_BDGET_FLAG) 139 aprint_normal("dbg_flags: DM_SKIP_BDGET_FLAG set In\n"); 140 141 if (flags & DM_SKIP_LOCKFS_FLAG) 142 aprint_normal("dbg_flags: DM_SKIP_LOCKFS_FLAG set In\n"); 143 144 if (flags & DM_NOFLUSH_FLAG) 145 aprint_normal("dbg_flags: DM_NOFLUSH_FLAG set In\n"); 146 147 return 0; 148 } 149 150 /* 151 * Get version ioctl call I do it as default therefore this 152 * function is unused now. 153 */ 154 int 155 dm_get_version_ioctl(prop_dictionary_t dm_dict) 156 { 157 return 0; 158 } 159 160 /* 161 * Get list of all available targets from global 162 * target list and sent them back to libdevmapper. 163 */ 164 int 165 dm_list_versions_ioctl(prop_dictionary_t dm_dict) 166 { 167 prop_array_t target_list; 168 uint32_t flags; 169 170 flags = 0; 171 172 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags); 173 174 dm_dbg_print_flags(flags); 175 176 target_list = dm_target_prop_list(); 177 178 prop_dictionary_set(dm_dict, DM_IOCTL_CMD_DATA, target_list); 179 180 return 0; 181 } 182 183 /* 184 * Create in-kernel entry for device. Device attributes such as name, uuid are 185 * taken from proplib dictionary. 186 * 187 */ 188 int 189 dm_dev_create_ioctl(prop_dictionary_t dm_dict) 190 { 191 dm_dev_t *dmv; 192 const char *name, *uuid; 193 uint32_t minor; 194 int r, flags; 195 196 r = 0; 197 flags = 0; 198 name = NULL; 199 uuid = NULL; 200 201 /* Get needed values from dictionary. */ 202 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_NAME, &name); 203 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_UUID, &uuid); 204 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags); 205 206 dm_dbg_print_flags(flags); 207 208 /* Lookup name and uuid if device already exist quit. */ 209 if ((dmv = dm_dev_lookup(name, uuid, -1)) != NULL) { 210 DM_ADD_FLAG(flags, DM_EXISTS_FLAG); /* Device already exists */ 211 dm_dev_unbusy(dmv); 212 return EEXIST; 213 } 214 215 if ((dmv = dm_dev_alloc()) == NULL) 216 return ENOMEM; 217 218 if (uuid) 219 strncpy(dmv->uuid, uuid, DM_UUID_LEN); 220 else 221 dmv->uuid[0] = '\0'; 222 223 if (name) 224 strlcpy(dmv->name, name, DM_NAME_LEN); 225 /* 226 * If DM_PERSISTENT_DEV_FLAG is set I have to use out of order minor 227 * number sent from userspace. With this libdevmapper doesn't 228 * need to recreate all device nodes after reboot. 229 */ 230 if (flags & DM_PERSISTENT_DEV_FLAG) 231 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_MINOR, 232 &dmv->minor); 233 else { 234 for(;;) { 235 /* find next available minor number and use it */ 236 minor = atomic_inc_32_nv(&sc_minor_num); 237 if (dm_dev_test_minor(minor) == 0) { 238 dmv->minor = minor; 239 break; 240 } 241 } 242 } 243 244 dmv->flags = 0; /* device flags are set when needed */ 245 dmv->ref_cnt = 0; 246 dmv->event_nr = 0; 247 dmv->dev_type = 0; 248 249 mutex_init(&dmv->dev_mtx, MUTEX_DEFAULT, IPL_NONE); 250 cv_init(&dmv->dev_cv, "dm_dev"); 251 252 dm_table_head_init(&dmv->table_head); 253 254 if (flags & DM_READONLY_FLAG) 255 dmv->flags |= DM_READONLY_FLAG; 256 257 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_MINOR, dmv->minor); 258 259 if ((r = dm_dev_insert(dmv)) != 0){ 260 dm_dev_free(dmv); 261 } 262 263 DM_ADD_FLAG(flags, DM_EXISTS_FLAG); 264 DM_REMOVE_FLAG(flags, DM_INACTIVE_PRESENT_FLAG); 265 266 return r; 267 } 268 269 /* 270 * Get list of created device-mapper devices fromglobal list and 271 * send it to kernel. 272 * 273 * Output dictionary: 274 * 275 * <key>cmd_data</key> 276 * <array> 277 * <dict> 278 * <key>name<key> 279 * <string>...</string> 280 * 281 * <key>dev</key> 282 * <integer>...</integer> 283 * </dict> 284 * </array> 285 * 286 */ 287 int 288 dm_dev_list_ioctl(prop_dictionary_t dm_dict) 289 { 290 prop_array_t dev_list; 291 292 uint32_t flags; 293 294 flags = 0; 295 296 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags); 297 298 dm_dbg_print_flags(flags); 299 300 dev_list = dm_dev_prop_list(); 301 302 prop_dictionary_set(dm_dict, DM_IOCTL_CMD_DATA, dev_list); 303 304 return 0; 305 } 306 307 /* 308 * Rename selected devices old name is in struct dm_ioctl. 309 * newname is taken from dictionary 310 * 311 * <key>cmd_data</key> 312 * <array> 313 * <string>...</string> 314 * </array> 315 */ 316 int 317 dm_dev_rename_ioctl(prop_dictionary_t dm_dict) 318 { 319 prop_array_t cmd_array; 320 dm_dev_t *dmv; 321 322 const char *name, *uuid, *n_name; 323 uint32_t flags, minor; 324 325 name = NULL; 326 uuid = NULL; 327 minor = 0; 328 329 /* Get needed values from dictionary. */ 330 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_NAME, &name); 331 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_UUID, &uuid); 332 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags); 333 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_MINOR, &minor); 334 335 dm_dbg_print_flags(flags); 336 337 cmd_array = prop_dictionary_get(dm_dict, DM_IOCTL_CMD_DATA); 338 339 prop_array_get_cstring_nocopy(cmd_array, 0, &n_name); 340 341 if (strlen(n_name) + 1 > DM_NAME_LEN) 342 return EINVAL; 343 344 if ((dmv = dm_dev_rem(name, uuid, minor)) == NULL) { 345 DM_REMOVE_FLAG(flags, DM_EXISTS_FLAG); 346 return ENOENT; 347 } 348 349 /* change device name */ 350 /* XXX How to deal with this change, name only used in 351 * dm_dev_routines, should I add dm_dev_change_name which will run under the 352 * dm_dev_list mutex ? 353 */ 354 strlcpy(dmv->name, n_name, DM_NAME_LEN); 355 356 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_OPEN, dmv->table_head.io_cnt); 357 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_MINOR, dmv->minor); 358 prop_dictionary_set_cstring(dm_dict, DM_IOCTL_UUID, dmv->uuid); 359 360 dm_dev_insert(dmv); 361 362 return 0; 363 } 364 365 /* 366 * Remove device from global list I have to remove active 367 * and inactive tables first. 368 */ 369 int 370 dm_dev_remove_ioctl(prop_dictionary_t dm_dict) 371 { 372 dm_dev_t *dmv; 373 const char *name, *uuid; 374 uint32_t flags, minor; 375 376 flags = 0; 377 name = NULL; 378 uuid = NULL; 379 380 /* Get needed values from dictionary. */ 381 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_NAME, &name); 382 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_UUID, &uuid); 383 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags); 384 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_MINOR, &minor); 385 386 dm_dbg_print_flags(flags); 387 388 /* Remove device from global device list */ 389 if ((dmv = dm_dev_rem(name, uuid, minor)) == NULL){ 390 DM_REMOVE_FLAG(flags, DM_EXISTS_FLAG); 391 return ENOENT; 392 } 393 394 /* Destroy active table first. */ 395 dm_table_destroy(&dmv->table_head, DM_TABLE_ACTIVE); 396 397 /* Destroy inactive table if exits, too. */ 398 dm_table_destroy(&dmv->table_head, DM_TABLE_INACTIVE); 399 400 dm_table_head_destroy(&dmv->table_head); 401 402 mutex_destroy(&dmv->dev_mtx); 403 cv_destroy(&dmv->dev_cv); 404 405 /* Destroy device */ 406 (void)dm_dev_free(dmv); 407 408 return 0; 409 } 410 411 /* 412 * Return actual state of device to libdevmapper. 413 */ 414 int 415 dm_dev_status_ioctl(prop_dictionary_t dm_dict) 416 { 417 dm_dev_t *dmv; 418 const char *name, *uuid; 419 uint32_t flags, j, minor; 420 421 name = NULL; 422 uuid = NULL; 423 flags = 0; 424 j = 0; 425 426 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_NAME, &name); 427 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_UUID, &uuid); 428 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags); 429 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_MINOR, &minor); 430 431 if ((dmv = dm_dev_lookup(name, uuid, minor)) == NULL) { 432 DM_REMOVE_FLAG(flags, DM_EXISTS_FLAG); 433 return ENOENT; 434 } 435 436 dm_dbg_print_flags(dmv->flags); 437 438 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_OPEN, dmv->table_head.io_cnt); 439 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_MINOR, dmv->minor); 440 prop_dictionary_set_cstring(dm_dict, DM_IOCTL_UUID, dmv->uuid); 441 442 if (dmv->flags & DM_SUSPEND_FLAG) 443 DM_ADD_FLAG(flags, DM_SUSPEND_FLAG); 444 445 /* Add status flags for tables I have to check both 446 active and inactive tables. */ 447 if ((j = dm_table_get_target_count(&dmv->table_head, DM_TABLE_ACTIVE))) { 448 DM_ADD_FLAG(flags, DM_ACTIVE_PRESENT_FLAG); 449 } else 450 DM_REMOVE_FLAG(flags, DM_ACTIVE_PRESENT_FLAG); 451 452 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_TARGET_COUNT, j); 453 454 if (dm_table_get_target_count(&dmv->table_head, DM_TABLE_INACTIVE)) 455 DM_ADD_FLAG(flags, DM_INACTIVE_PRESENT_FLAG); 456 else 457 DM_REMOVE_FLAG(flags, DM_INACTIVE_PRESENT_FLAG); 458 459 dm_dev_unbusy(dmv); 460 461 return 0; 462 } 463 464 /* 465 * Set only flag to suggest that device is suspended. This call is 466 * not supported in NetBSD. 467 * 468 */ 469 int 470 dm_dev_suspend_ioctl(prop_dictionary_t dm_dict) 471 { 472 dm_dev_t *dmv; 473 const char *name, *uuid; 474 uint32_t flags, minor; 475 476 name = NULL; 477 uuid = NULL; 478 flags = 0; 479 480 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_NAME, &name); 481 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_UUID, &uuid); 482 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags); 483 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_MINOR, &minor); 484 485 if ((dmv = dm_dev_lookup(name, uuid, minor)) == NULL){ 486 DM_REMOVE_FLAG(flags, DM_EXISTS_FLAG); 487 return ENOENT; 488 } 489 490 atomic_or_32(&dmv->flags, DM_SUSPEND_FLAG); 491 492 dm_dbg_print_flags(dmv->flags); 493 494 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_OPEN, dmv->table_head.io_cnt); 495 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_FLAGS, dmv->flags); 496 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_MINOR, dmv->minor); 497 498 dm_dev_unbusy(dmv); 499 500 /* Add flags to dictionary flag after dmv -> dict copy */ 501 DM_ADD_FLAG(flags, DM_EXISTS_FLAG); 502 503 return 0; 504 } 505 506 /* 507 * Simulate Linux behaviour better and switch tables here and not in 508 * dm_table_load_ioctl. 509 */ 510 int 511 dm_dev_resume_ioctl(prop_dictionary_t dm_dict) 512 { 513 dm_dev_t *dmv; 514 const char *name, *uuid; 515 uint32_t flags, minor; 516 517 name = NULL; 518 uuid = NULL; 519 flags = 0; 520 521 /* char *xml; 522 xml = prop_dictionary_externalize(dm_dict); 523 printf("%s\n",xml);*/ 524 525 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_NAME, &name); 526 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_UUID, &uuid); 527 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags); 528 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_MINOR, &minor); 529 530 /* Remove device from global device list */ 531 if ((dmv = dm_dev_lookup(name, uuid, minor)) == NULL){ 532 DM_REMOVE_FLAG(flags, DM_EXISTS_FLAG); 533 return ENOENT; 534 } 535 536 atomic_and_32(&dmv->flags, ~(DM_SUSPEND_FLAG | DM_INACTIVE_PRESENT_FLAG)); 537 atomic_or_32(&dmv->flags, DM_ACTIVE_PRESENT_FLAG); 538 539 dm_table_switch_tables(&dmv->table_head); 540 541 DM_ADD_FLAG(flags, DM_EXISTS_FLAG); 542 543 dmgetdisklabel(dmv->dk_label, &dmv->table_head); 544 545 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_OPEN, dmv->table_head.io_cnt); 546 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_FLAGS, dmv->flags); 547 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_MINOR, dmv->minor); 548 549 dm_dev_unbusy(dmv); 550 551 /* Destroy inactive table after resume. */ 552 dm_table_destroy(&dmv->table_head, DM_TABLE_INACTIVE); 553 554 return 0; 555 } 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_verbose("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 } 593 594 /* Select unused table */ 595 dm_table_destroy(&dmv->table_head, DM_TABLE_INACTIVE); 596 597 atomic_and_32(&dmv->flags, ~DM_INACTIVE_PRESENT_FLAG); 598 599 dm_dev_unbusy(dmv); 600 601 return 0; 602 } 603 604 /* 605 * Get list of physical devices for active table. 606 * Get dev_t from pdev vnode and insert it into cmd_array. 607 * 608 * XXX. This function is called from lvm2tools to get information 609 * about physical devices, too e.g. during vgcreate. 610 */ 611 int 612 dm_table_deps_ioctl(prop_dictionary_t dm_dict) 613 { 614 dm_dev_t *dmv; 615 dm_table_t *tbl; 616 dm_table_entry_t *table_en; 617 618 prop_array_t cmd_array; 619 const char *name, *uuid; 620 uint32_t flags, minor; 621 622 size_t i; 623 624 name = NULL; 625 uuid = NULL; 626 dmv = NULL; 627 flags = 0; 628 629 i = 0; 630 631 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_NAME, &name); 632 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_UUID, &uuid); 633 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags); 634 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_MINOR, &minor); 635 636 /* create array for dev_t's */ 637 cmd_array = prop_array_create(); 638 639 if ((dmv = dm_dev_lookup(name, uuid, minor)) == NULL){ 640 DM_REMOVE_FLAG(flags, DM_EXISTS_FLAG); 641 return ENOENT; 642 } 643 644 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_MINOR, dmv->minor); 645 prop_dictionary_set_cstring(dm_dict, DM_IOCTL_NAME, dmv->name); 646 prop_dictionary_set_cstring(dm_dict, DM_IOCTL_UUID, dmv->uuid); 647 648 aprint_verbose("Getting table deps for device: %s\n", dmv->name); 649 650 tbl = dm_table_get_entry(&dmv->table_head, DM_TABLE_ACTIVE); 651 652 SLIST_FOREACH(table_en, tbl, next) 653 table_en->target->deps(table_en, cmd_array); 654 655 dm_table_release(&dmv->table_head, DM_TABLE_ACTIVE); 656 dm_dev_unbusy(dmv); 657 658 prop_dictionary_set(dm_dict, DM_IOCTL_CMD_DATA, cmd_array); 659 660 return 0; 661 } 662 663 /* 664 * Load new table/tables to device. 665 * Call apropriate target init routine open all physical pdev's and 666 * link them to device. For other targets mirror, strip, snapshot 667 * etc. also add dependency devices to upcalls list. 668 * 669 * Load table to inactive slot table are switched in dm_device_resume_ioctl. 670 * This simulates Linux behaviour better there should not be any difference. 671 * 672 */ 673 int 674 dm_table_load_ioctl(prop_dictionary_t dm_dict) 675 { 676 dm_dev_t *dmv; 677 dm_table_entry_t *table_en, *last_table; 678 dm_table_t *tbl; 679 dm_target_t *target; 680 681 prop_object_iterator_t iter; 682 prop_array_t cmd_array; 683 prop_dictionary_t target_dict; 684 685 const char *name, *uuid, *type; 686 687 uint32_t flags, ret, minor; 688 689 char *str; 690 691 ret = 0; 692 flags = 0; 693 name = NULL; 694 uuid = NULL; 695 dmv = NULL; 696 last_table = NULL; 697 str = NULL; 698 699 /* char *xml; 700 xml = prop_dictionary_externalize(dm_dict); 701 printf("%s\n",xml);*/ 702 703 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_NAME, &name); 704 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_UUID, &uuid); 705 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags); 706 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_MINOR, &minor); 707 708 cmd_array = prop_dictionary_get(dm_dict, DM_IOCTL_CMD_DATA); 709 iter = prop_array_iterator(cmd_array); 710 dm_dbg_print_flags(flags); 711 712 if ((dmv = dm_dev_lookup(name, uuid, minor)) == NULL){ 713 DM_REMOVE_FLAG(flags, DM_EXISTS_FLAG); 714 return ENOENT; 715 } 716 717 aprint_normal("Loading table to device: %s--%d\n",name,dmv->table_head.cur_active_table); 718 719 /* 720 * I have to check if this table slot is not used by another table list. 721 * if it is used I should free them. 722 */ 723 if (dmv->flags & DM_INACTIVE_PRESENT_FLAG) 724 dm_table_destroy(&dmv->table_head, DM_TABLE_INACTIVE); 725 726 dm_dbg_print_flags(dmv->flags); 727 tbl = dm_table_get_entry(&dmv->table_head, DM_TABLE_INACTIVE); 728 729 printf("dmv->name = %s\n", dmv->name); 730 731 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_MINOR, dmv->minor); 732 733 while((target_dict = prop_object_iterator_next(iter)) != NULL){ 734 735 prop_dictionary_get_cstring_nocopy(target_dict, 736 DM_TABLE_TYPE, &type); 737 738 /* 739 * If we want to deny table with 2 or more different 740 * target we should do it here 741 */ 742 if ((target = dm_target_lookup_name(type)) == NULL) 743 return ENOENT; 744 745 if ((table_en=kmem_alloc(sizeof(dm_table_entry_t), 746 KM_NOSLEEP)) == NULL) 747 return ENOMEM; 748 749 prop_dictionary_get_uint64(target_dict, DM_TABLE_START, 750 &table_en->start); 751 prop_dictionary_get_uint64(target_dict, DM_TABLE_LENGTH, 752 &table_en->length); 753 754 table_en->target = target; 755 table_en->dm_dev = dmv; 756 table_en->target_config = NULL; 757 758 /* 759 * There is a parameter string after dm_target_spec 760 * structure which points to /dev/wd0a 284 part of 761 * table. String str points to this text. This can be 762 * null and therefore it should be checked before we try to 763 * use it. 764 */ 765 prop_dictionary_get_cstring(target_dict, 766 DM_TABLE_PARAMS, (char**)&str); 767 768 if (SLIST_EMPTY(tbl)) 769 /* insert this table to head */ 770 SLIST_INSERT_HEAD(tbl, table_en, next); 771 else 772 SLIST_INSERT_AFTER(last_table, table_en, next); 773 774 /* 775 * Params string is different for every target, 776 * therfore I have to pass it to target init 777 * routine and parse parameters there. 778 */ 779 780 if ((ret = target->init(dmv, &table_en->target_config, 781 str)) != 0) { 782 783 dm_table_destroy(&dmv->table_head, DM_TABLE_INACTIVE); 784 return ret; 785 } 786 787 last_table = table_en; 788 789 if (str != NULL) 790 prop_object_release(str); 791 } 792 793 prop_object_release(cmd_array); 794 795 DM_ADD_FLAG(flags, DM_INACTIVE_PRESENT_FLAG); 796 atomic_or_32(&dmv->flags, DM_INACTIVE_PRESENT_FLAG); 797 798 dm_table_release(&dmv->table_head, DM_TABLE_INACTIVE); 799 dm_dev_unbusy(dmv); 800 return 0; 801 } 802 803 /* 804 * Get description of all tables loaded to device from kernel 805 * and send it to libdevmapper. 806 * 807 * Output dictionary for every table: 808 * 809 * <key>cmd_data</key> 810 * <array> 811 * <dict> 812 * <key>type<key> 813 * <string>...</string> 814 * 815 * <key>start</key> 816 * <integer>...</integer> 817 * 818 * <key>length</key> 819 * <integer>...</integer> 820 * 821 * <key>params</key> 822 * <string>...</string> 823 * </dict> 824 * </array> 825 * 826 */ 827 int 828 dm_table_status_ioctl(prop_dictionary_t dm_dict) 829 { 830 dm_dev_t *dmv; 831 dm_table_t *tbl; 832 dm_table_entry_t *table_en; 833 834 prop_array_t cmd_array; 835 prop_dictionary_t target_dict; 836 837 uint32_t rec_size, minor; 838 839 const char *name, *uuid; 840 char *params; 841 int flags; 842 843 dmv = NULL; 844 uuid = NULL; 845 name = NULL; 846 params = NULL; 847 flags = 0; 848 rec_size = 0; 849 850 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_NAME, &name); 851 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_UUID, &uuid); 852 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags); 853 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_MINOR, &minor); 854 855 if ((cmd_array = prop_dictionary_get(dm_dict, DM_IOCTL_CMD_DATA)) == NULL) 856 cmd_array = prop_array_create(); 857 858 if ((dmv = dm_dev_lookup(name, uuid, minor)) == NULL){ 859 DM_REMOVE_FLAG(flags, DM_EXISTS_FLAG); 860 return ENOENT; 861 } 862 863 if (dm_table_get_target_count(&dmv->table_head, DM_TABLE_ACTIVE)) 864 DM_ADD_FLAG(flags, DM_ACTIVE_PRESENT_FLAG); 865 else { 866 DM_REMOVE_FLAG(flags, DM_ACTIVE_PRESENT_FLAG); 867 868 if (dm_table_get_target_count(&dmv->table_head, DM_TABLE_INACTIVE)) 869 DM_ADD_FLAG(flags, DM_INACTIVE_PRESENT_FLAG); 870 else { 871 DM_REMOVE_FLAG(flags, DM_INACTIVE_PRESENT_FLAG); 872 } 873 } 874 875 if (dmv->flags & DM_SUSPEND_FLAG) 876 DM_ADD_FLAG(flags, DM_SUSPEND_FLAG); 877 878 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_MINOR, dmv->minor); 879 880 /* I should use mutex here and not rwlock there can be IO operation 881 during this ioctl on device. */ 882 883 aprint_normal("Status of device tables: %s--%d\n", 884 name, dmv->table_head.cur_active_table); 885 886 tbl = dm_table_get_entry(&dmv->table_head, DM_TABLE_ACTIVE); 887 888 SLIST_FOREACH(table_en, tbl, next) 889 { 890 target_dict = prop_dictionary_create(); 891 aprint_verbose("%016" PRIu64 ", length %016" PRIu64 892 ", target %s\n", table_en->start, table_en->length, 893 table_en->target->name); 894 895 prop_dictionary_set_uint64(target_dict, DM_TABLE_START, 896 table_en->start); 897 prop_dictionary_set_uint64(target_dict, DM_TABLE_LENGTH, 898 table_en->length); 899 900 prop_dictionary_set_cstring(target_dict, DM_TABLE_TYPE, 901 table_en->target->name); 902 903 /* dm_table_get_cur_actv.table ?? */ 904 prop_dictionary_set_int32(target_dict, DM_TABLE_STAT, 905 dmv->table_head.cur_active_table); 906 907 if (flags |= DM_STATUS_TABLE_FLAG) { 908 params = table_en->target->status 909 (table_en->target_config); 910 911 if(params != NULL){ 912 prop_dictionary_set_cstring(target_dict, 913 DM_TABLE_PARAMS, params); 914 915 kmem_free(params, strlen(params) + 1); 916 } 917 } 918 prop_array_add(cmd_array, target_dict); 919 prop_object_release(target_dict); 920 } 921 922 dm_table_release(&dmv->table_head, DM_TABLE_ACTIVE); 923 dm_dev_unbusy(dmv); 924 925 prop_dictionary_set(dm_dict, DM_IOCTL_CMD_DATA, cmd_array); 926 return 0; 927 } 928 929 930 /* 931 * For every call I have to set kernel driver version. 932 * Because I can have commands supported only in other 933 * newer/later version. This routine is called for every 934 * ioctl command. 935 */ 936 int 937 dm_check_version(prop_dictionary_t dm_dict) 938 { 939 size_t i; 940 int dm_version[3]; 941 prop_array_t ver; 942 943 ver = prop_dictionary_get(dm_dict, DM_IOCTL_VERSION); 944 945 for(i=0; i < 3; i++) 946 prop_array_get_uint32(ver, i, &dm_version[i]); 947 948 949 if (DM_VERSION_MAJOR != dm_version[0] || DM_VERSION_MINOR < dm_version[1]){ 950 aprint_verbose("libdevmapper/kernel version mismatch " 951 "kernel: %d.%d.%d libdevmapper: %d.%d.%d\n", 952 DM_VERSION_MAJOR, DM_VERSION_MINOR, DM_VERSION_PATCHLEVEL, 953 dm_version[0], dm_version[1], dm_version[2]); 954 955 return EIO; 956 } 957 958 prop_array_set_uint32(ver, 0, DM_VERSION_MAJOR); 959 prop_array_set_uint32(ver, 1, DM_VERSION_MINOR); 960 prop_array_set_uint32(ver, 2, DM_VERSION_PATCHLEVEL); 961 962 return 0; 963 } 964
Indexes created Tue Sep 30 20:09:53 GMT 2025