dm_ioctl.c revision 1.6.4.3
1 /* $NetBSD: dm_ioctl.c,v 1.6.4.3 2009/03/03 18:30:44 skrll 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 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/disk.h> 85 #include <sys/disklabel.h> 86 #include <sys/kmem.h> 87 #include <sys/malloc.h> 88 #include <sys/vnode.h> 89 90 #include <machine/int_fmtio.h> 91 92 #include "netbsd-dm.h" 93 #include "dm.h" 94 95 static uint64_t sc_minor_num; 96 uint64_t dev_counter; 97 98 #define DM_REMOVE_FLAG(flag, name) do { \ 99 prop_dictionary_get_uint32(dm_dict,DM_IOCTL_FLAGS,&flag); \ 100 flag &= ~name; \ 101 prop_dictionary_set_uint32(dm_dict,DM_IOCTL_FLAGS,flag); \ 102 } while (/*CONSTCOND*/0) 103 104 #define DM_ADD_FLAG(flag, name) do { \ 105 prop_dictionary_get_uint32(dm_dict,DM_IOCTL_FLAGS,&flag); \ 106 flag |= name; \ 107 prop_dictionary_set_uint32(dm_dict,DM_IOCTL_FLAGS,flag); \ 108 } while (/*CONSTCOND*/0) 109 110 static int dm_dbg_print_flags(int); 111 112 /* 113 * Print flags sent to the kernel from libevmapper. 114 */ 115 static int 116 dm_dbg_print_flags(int flags) 117 { 118 aprint_debug("dbg_print --- %d\n",flags); 119 120 if (flags & DM_READONLY_FLAG) 121 aprint_debug("dbg_flags: DM_READONLY_FLAG set In/Out\n"); 122 123 if (flags & DM_SUSPEND_FLAG) 124 aprint_debug("dbg_flags: DM_SUSPEND_FLAG set In/Out \n"); 125 126 if (flags & DM_PERSISTENT_DEV_FLAG) 127 aprint_debug("db_flags: DM_PERSISTENT_DEV_FLAG set In\n"); 128 129 if (flags & DM_STATUS_TABLE_FLAG) 130 aprint_debug("dbg_flags: DM_STATUS_TABLE_FLAG set In\n"); 131 132 if (flags & DM_ACTIVE_PRESENT_FLAG) 133 aprint_debug("dbg_flags: DM_ACTIVE_PRESENT_FLAG set Out\n"); 134 135 if (flags & DM_INACTIVE_PRESENT_FLAG) 136 aprint_debug("dbg_flags: DM_INACTIVE_PRESENT_FLAG set Out\n"); 137 138 if (flags & DM_BUFFER_FULL_FLAG) 139 aprint_debug("dbg_flags: DM_BUFFER_FULL_FLAG set Out\n"); 140 141 if (flags & DM_SKIP_BDGET_FLAG) 142 aprint_debug("dbg_flags: DM_SKIP_BDGET_FLAG set In\n"); 143 144 if (flags & DM_SKIP_LOCKFS_FLAG) 145 aprint_debug("dbg_flags: DM_SKIP_LOCKFS_FLAG set In\n"); 146 147 if (flags & DM_NOFLUSH_FLAG) 148 aprint_debug("dbg_flags: DM_NOFLUSH_FLAG set In\n"); 149 150 return 0; 151 } 152 153 /* 154 * Get version ioctl call I do it as default therefore this 155 * function is unused now. 156 */ 157 int 158 dm_get_version_ioctl(prop_dictionary_t dm_dict) 159 { 160 return 0; 161 } 162 163 /* 164 * Get list of all available targets from global 165 * target list and sent them back to libdevmapper. 166 */ 167 int 168 dm_list_versions_ioctl(prop_dictionary_t dm_dict) 169 { 170 prop_array_t target_list; 171 uint32_t flags; 172 173 flags = 0; 174 175 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags); 176 177 dm_dbg_print_flags(flags); 178 179 target_list = dm_target_prop_list(); 180 181 prop_dictionary_set(dm_dict, DM_IOCTL_CMD_DATA, target_list); 182 183 prop_object_release(target_list); 184 185 return 0; 186 } 187 188 /* 189 * Create in-kernel entry for device. Device attributes such as name, uuid are 190 * taken from proplib dictionary. 191 * 192 */ 193 int 194 dm_dev_create_ioctl(prop_dictionary_t dm_dict) 195 { 196 dm_dev_t *dmv; 197 const char *name, *uuid; 198 int r, flags; 199 200 r = 0; 201 flags = 0; 202 name = NULL; 203 uuid = NULL; 204 205 /* Get needed values from dictionary. */ 206 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_NAME, &name); 207 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_UUID, &uuid); 208 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags); 209 210 dm_dbg_print_flags(flags); 211 212 /* Lookup name and uuid if device already exist quit. */ 213 if ((dmv = dm_dev_lookup(name, uuid, -1)) != NULL) { 214 DM_ADD_FLAG(flags, DM_EXISTS_FLAG); /* Device already exists */ 215 dm_dev_unbusy(dmv); 216 return EEXIST; 217 } 218 219 if ((dmv = dm_dev_alloc()) == NULL) 220 return ENOMEM; 221 222 if ((dmv->diskp = kmem_alloc(sizeof(struct disk), KM_NOSLEEP)) == NULL) 223 return ENOMEM; 224 225 if (uuid) 226 strncpy(dmv->uuid, uuid, DM_UUID_LEN); 227 else 228 dmv->uuid[0] = '\0'; 229 230 if (name) 231 strlcpy(dmv->name, name, DM_NAME_LEN); 232 233 dmv->minor = atomic_inc_64_nv(&sc_minor_num); 234 235 dmv->flags = 0; /* device flags are set when needed */ 236 dmv->ref_cnt = 0; 237 dmv->event_nr = 0; 238 dmv->dev_type = 0; 239 240 mutex_init(&dmv->dev_mtx, MUTEX_DEFAULT, IPL_NONE); 241 cv_init(&dmv->dev_cv, "dm_dev"); 242 243 dm_table_head_init(&dmv->table_head); 244 245 if (flags & DM_READONLY_FLAG) 246 dmv->flags |= DM_READONLY_FLAG; 247 248 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_MINOR, dmv->minor); 249 250 disk_init(dmv->diskp, dmv->name, NULL); 251 252 if ((r = dm_dev_insert(dmv)) != 0){ 253 dm_dev_free(dmv); 254 } 255 256 DM_ADD_FLAG(flags, DM_EXISTS_FLAG); 257 DM_REMOVE_FLAG(flags, DM_INACTIVE_PRESENT_FLAG); 258 259 /* Increment device counter After creating device */ 260 atomic_inc_64(&dev_counter); 261 262 return r; 263 } 264 265 /* 266 * Get list of created device-mapper devices fromglobal list and 267 * send it to kernel. 268 * 269 * Output dictionary: 270 * 271 * <key>cmd_data</key> 272 * <array> 273 * <dict> 274 * <key>name<key> 275 * <string>...</string> 276 * 277 * <key>dev</key> 278 * <integer>...</integer> 279 * </dict> 280 * </array> 281 * 282 */ 283 int 284 dm_dev_list_ioctl(prop_dictionary_t dm_dict) 285 { 286 prop_array_t dev_list; 287 288 uint32_t flags; 289 290 flags = 0; 291 292 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags); 293 294 dm_dbg_print_flags(flags); 295 296 dev_list = dm_dev_prop_list(); 297 298 prop_dictionary_set(dm_dict, DM_IOCTL_CMD_DATA, dev_list); 299 prop_object_release(dev_list); 300 301 return 0; 302 } 303 304 /* 305 * Rename selected devices old name is in struct dm_ioctl. 306 * newname is taken from dictionary 307 * 308 * <key>cmd_data</key> 309 * <array> 310 * <string>...</string> 311 * </array> 312 */ 313 int 314 dm_dev_rename_ioctl(prop_dictionary_t dm_dict) 315 { 316 prop_array_t cmd_array; 317 dm_dev_t *dmv; 318 319 const char *name, *uuid, *n_name; 320 uint32_t flags, minor; 321 322 name = NULL; 323 uuid = NULL; 324 minor = 0; 325 326 /* Get needed values from dictionary. */ 327 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_NAME, &name); 328 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_UUID, &uuid); 329 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags); 330 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_MINOR, &minor); 331 332 dm_dbg_print_flags(flags); 333 334 cmd_array = prop_dictionary_get(dm_dict, DM_IOCTL_CMD_DATA); 335 336 prop_array_get_cstring_nocopy(cmd_array, 0, &n_name); 337 338 if (strlen(n_name) + 1 > DM_NAME_LEN) 339 return EINVAL; 340 341 if ((dmv = dm_dev_rem(name, uuid, minor)) == NULL) { 342 DM_REMOVE_FLAG(flags, DM_EXISTS_FLAG); 343 return ENOENT; 344 } 345 346 /* change device name */ 347 /* XXX How to deal with this change, name only used in 348 * dm_dev_routines, should I add dm_dev_change_name which will run under the 349 * dm_dev_list mutex ? 350 */ 351 strlcpy(dmv->name, n_name, DM_NAME_LEN); 352 353 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_OPEN, dmv->table_head.io_cnt); 354 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_MINOR, dmv->minor); 355 prop_dictionary_set_cstring(dm_dict, DM_IOCTL_UUID, dmv->uuid); 356 357 dm_dev_insert(dmv); 358 359 return 0; 360 } 361 362 /* 363 * Remove device from global list I have to remove active 364 * and inactive tables first. 365 */ 366 int 367 dm_dev_remove_ioctl(prop_dictionary_t dm_dict) 368 { 369 dm_dev_t *dmv; 370 const char *name, *uuid; 371 uint32_t flags, minor; 372 373 flags = 0; 374 name = NULL; 375 uuid = NULL; 376 377 /* Get needed values from dictionary. */ 378 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_NAME, &name); 379 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_UUID, &uuid); 380 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags); 381 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_MINOR, &minor); 382 383 dm_dbg_print_flags(flags); 384 385 /* Remove device from global device list */ 386 if ((dmv = dm_dev_rem(name, uuid, minor)) == NULL){ 387 DM_REMOVE_FLAG(flags, DM_EXISTS_FLAG); 388 return ENOENT; 389 } 390 391 /* Destroy active table first. */ 392 dm_table_destroy(&dmv->table_head, DM_TABLE_ACTIVE); 393 394 /* Destroy inactive table if exits, too. */ 395 dm_table_destroy(&dmv->table_head, DM_TABLE_INACTIVE); 396 397 dm_table_head_destroy(&dmv->table_head); 398 399 mutex_destroy(&dmv->dev_mtx); 400 cv_destroy(&dmv->dev_cv); 401 402 /* Destroy device */ 403 (void)dm_dev_free(dmv); 404 405 /* Decrement device counter After removing device */ 406 atomic_dec_64(&dev_counter); 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); 538 539 540 dm_table_switch_tables(&dmv->table_head); 541 542 DM_ADD_FLAG(flags, DM_EXISTS_FLAG); 543 544 dmgetdisklabel(dmv->dk_label, &dmv->table_head); 545 546 disk_attach(dmv->diskp); 547 dmgetdisklabel(dmv->diskp->dk_label, &dmv->table_head); 548 549 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_OPEN, dmv->table_head.io_cnt); 550 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_FLAGS, dmv->flags); 551 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_MINOR, dmv->minor); 552 553 dm_dev_unbusy(dmv); 554 555 /* Destroy inactive table after resume. */ 556 dm_table_destroy(&dmv->table_head, DM_TABLE_INACTIVE); 557 558 return 0; 559 } 560 561 /* 562 * Table management routines 563 * lvm2tools doens't send name/uuid to kernel with table 564 * for lookup I have to use minor number. 565 */ 566 567 /* 568 * Remove inactive table from device. Routines which work's with inactive tables 569 * doesn't need to synchronise with dmstrategy. They can synchronise themselves with mutex?. 570 * 571 */ 572 int 573 dm_table_clear_ioctl(prop_dictionary_t dm_dict) 574 { 575 dm_dev_t *dmv; 576 const char *name, *uuid; 577 uint32_t flags, minor; 578 579 dmv = NULL; 580 name = NULL; 581 uuid = NULL; 582 flags = 0; 583 minor = 0; 584 585 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_NAME, &name); 586 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_UUID, &uuid); 587 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags); 588 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_MINOR, &minor); 589 590 aprint_debug("Clearing inactive table from device: %s--%s\n", 591 name, uuid); 592 593 if ((dmv = dm_dev_lookup(name, uuid, minor)) == NULL){ 594 DM_REMOVE_FLAG(flags, DM_EXISTS_FLAG); 595 return ENOENT; 596 } 597 598 /* Select unused table */ 599 dm_table_destroy(&dmv->table_head, DM_TABLE_INACTIVE); 600 601 atomic_and_32(&dmv->flags, ~DM_INACTIVE_PRESENT_FLAG); 602 603 dm_dev_unbusy(dmv); 604 605 return 0; 606 } 607 608 /* 609 * Get list of physical devices for active table. 610 * Get dev_t from pdev vnode and insert it into cmd_array. 611 * 612 * XXX. This function is called from lvm2tools to get information 613 * about physical devices, too e.g. during vgcreate. 614 */ 615 int 616 dm_table_deps_ioctl(prop_dictionary_t dm_dict) 617 { 618 dm_dev_t *dmv; 619 dm_table_t *tbl; 620 dm_table_entry_t *table_en; 621 622 prop_array_t cmd_array; 623 const char *name, *uuid; 624 uint32_t flags, minor; 625 626 size_t i; 627 628 name = NULL; 629 uuid = NULL; 630 dmv = NULL; 631 flags = 0; 632 633 i = 0; 634 635 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_NAME, &name); 636 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_UUID, &uuid); 637 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags); 638 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_MINOR, &minor); 639 640 /* create array for dev_t's */ 641 cmd_array = prop_array_create(); 642 643 if ((dmv = dm_dev_lookup(name, uuid, minor)) == NULL){ 644 DM_REMOVE_FLAG(flags, DM_EXISTS_FLAG); 645 return ENOENT; 646 } 647 648 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_MINOR, dmv->minor); 649 prop_dictionary_set_cstring(dm_dict, DM_IOCTL_NAME, dmv->name); 650 prop_dictionary_set_cstring(dm_dict, DM_IOCTL_UUID, dmv->uuid); 651 652 aprint_debug("Getting table deps for device: %s\n", dmv->name); 653 654 tbl = dm_table_get_entry(&dmv->table_head, DM_TABLE_ACTIVE); 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, DM_TABLE_ACTIVE); 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 /* 669 * Load new table/tables to device. 670 * Call apropriate target init routine open all physical pdev's and 671 * link them to device. For other targets mirror, strip, snapshot 672 * etc. also add dependency devices to upcalls list. 673 * 674 * Load table to inactive slot table are switched in dm_device_resume_ioctl. 675 * This simulates Linux behaviour better there should not be any difference. 676 * 677 */ 678 int 679 dm_table_load_ioctl(prop_dictionary_t dm_dict) 680 { 681 dm_dev_t *dmv; 682 dm_table_entry_t *table_en, *last_table; 683 dm_table_t *tbl; 684 dm_target_t *target; 685 686 prop_object_iterator_t iter; 687 prop_array_t cmd_array; 688 prop_dictionary_t target_dict; 689 690 const char *name, *uuid, *type; 691 692 uint32_t flags, ret, minor; 693 694 char *str; 695 696 ret = 0; 697 flags = 0; 698 name = NULL; 699 uuid = NULL; 700 dmv = NULL; 701 last_table = NULL; 702 str = NULL; 703 704 /* char *xml; 705 xml = prop_dictionary_externalize(dm_dict); 706 printf("%s\n",xml);*/ 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 return ENOENT; 720 } 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 return ENOENT; 752 } 753 754 if ((table_en = kmem_alloc(sizeof(dm_table_entry_t), 755 KM_NOSLEEP)) == NULL) { 756 dm_table_release(&dmv->table_head, DM_TABLE_INACTIVE); 757 dm_dev_unbusy(dmv); 758 return ENOMEM; 759 } 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)) 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 return ret; 801 } 802 last_table = table_en; 803 free(str, M_TEMP); 804 } 805 prop_object_iterator_release(iter); 806 807 DM_ADD_FLAG(flags, DM_INACTIVE_PRESENT_FLAG); 808 atomic_or_32(&dmv->flags, DM_INACTIVE_PRESENT_FLAG); 809 810 dm_table_release(&dmv->table_head, DM_TABLE_INACTIVE); 811 dm_dev_unbusy(dmv); 812 return 0; 813 } 814 815 /* 816 * Get description of all tables loaded to device from kernel 817 * and send it to libdevmapper. 818 * 819 * Output dictionary for every table: 820 * 821 * <key>cmd_data</key> 822 * <array> 823 * <dict> 824 * <key>type<key> 825 * <string>...</string> 826 * 827 * <key>start</key> 828 * <integer>...</integer> 829 * 830 * <key>length</key> 831 * <integer>...</integer> 832 * 833 * <key>params</key> 834 * <string>...</string> 835 * </dict> 836 * </array> 837 * 838 */ 839 int 840 dm_table_status_ioctl(prop_dictionary_t dm_dict) 841 { 842 dm_dev_t *dmv; 843 dm_table_t *tbl; 844 dm_table_entry_t *table_en; 845 846 prop_array_t cmd_array; 847 prop_dictionary_t target_dict; 848 849 uint32_t rec_size, minor; 850 851 const char *name, *uuid; 852 char *params; 853 int flags; 854 855 dmv = NULL; 856 uuid = NULL; 857 name = NULL; 858 params = NULL; 859 flags = 0; 860 rec_size = 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_table_get_target_count(&dmv->table_head, DM_TABLE_ACTIVE)) 875 DM_ADD_FLAG(flags, DM_ACTIVE_PRESENT_FLAG); 876 else { 877 DM_REMOVE_FLAG(flags, DM_ACTIVE_PRESENT_FLAG); 878 879 if (dm_table_get_target_count(&dmv->table_head, DM_TABLE_INACTIVE)) 880 DM_ADD_FLAG(flags, DM_INACTIVE_PRESENT_FLAG); 881 else { 882 DM_REMOVE_FLAG(flags, DM_INACTIVE_PRESENT_FLAG); 883 } 884 } 885 886 if (dmv->flags & DM_SUSPEND_FLAG) 887 DM_ADD_FLAG(flags, DM_SUSPEND_FLAG); 888 889 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_MINOR, dmv->minor); 890 891 /* I should use mutex here and not rwlock there can be IO operation 892 during this ioctl on device. */ 893 894 aprint_debug("Status of device tables: %s--%d\n", 895 name, dmv->table_head.cur_active_table); 896 897 tbl = dm_table_get_entry(&dmv->table_head, DM_TABLE_ACTIVE); 898 899 SLIST_FOREACH(table_en, tbl, next) 900 { 901 target_dict = prop_dictionary_create(); 902 aprint_debug("%016" PRIu64 ", length %016" PRIu64 903 ", target %s\n", table_en->start, table_en->length, 904 table_en->target->name); 905 906 prop_dictionary_set_uint64(target_dict, DM_TABLE_START, 907 table_en->start); 908 prop_dictionary_set_uint64(target_dict, DM_TABLE_LENGTH, 909 table_en->length); 910 911 prop_dictionary_set_cstring(target_dict, DM_TABLE_TYPE, 912 table_en->target->name); 913 914 /* dm_table_get_cur_actv.table ?? */ 915 prop_dictionary_set_int32(target_dict, DM_TABLE_STAT, 916 dmv->table_head.cur_active_table); 917 918 if (flags |= DM_STATUS_TABLE_FLAG) { 919 params = table_en->target->status 920 (table_en->target_config); 921 922 if(params != NULL){ 923 prop_dictionary_set_cstring(target_dict, 924 DM_TABLE_PARAMS, params); 925 926 kmem_free(params, strlen(params) + 1); 927 } 928 } 929 930 prop_array_add(cmd_array, target_dict); 931 prop_object_release(target_dict); 932 } 933 934 dm_table_release(&dmv->table_head, DM_TABLE_ACTIVE); 935 dm_dev_unbusy(dmv); 936 937 prop_dictionary_set(dm_dict, DM_IOCTL_CMD_DATA, cmd_array); 938 prop_object_release(cmd_array); 939 940 return 0; 941 } 942 943 944 /* 945 * For every call I have to set kernel driver version. 946 * Because I can have commands supported only in other 947 * newer/later version. This routine is called for every 948 * ioctl command. 949 */ 950 int 951 dm_check_version(prop_dictionary_t dm_dict) 952 { 953 size_t i; 954 int dm_version[3]; 955 prop_array_t ver; 956 957 ver = prop_dictionary_get(dm_dict, DM_IOCTL_VERSION); 958 959 for(i=0; i < 3; i++) 960 prop_array_get_uint32(ver, i, &dm_version[i]); 961 962 if (DM_VERSION_MAJOR != dm_version[0] || DM_VERSION_MINOR < dm_version[1]){ 963 aprint_debug("libdevmapper/kernel version mismatch " 964 "kernel: %d.%d.%d libdevmapper: %d.%d.%d\n", 965 DM_VERSION_MAJOR, DM_VERSION_MINOR, DM_VERSION_PATCHLEVEL, 966 dm_version[0], dm_version[1], dm_version[2]); 967 968 return EIO; 969 } 970 971 prop_array_set_uint32(ver, 0, DM_VERSION_MAJOR); 972 prop_array_set_uint32(ver, 1, DM_VERSION_MINOR); 973 prop_array_set_uint32(ver, 2, DM_VERSION_PATCHLEVEL); 974 975 return 0; 976 } 977
Indexes created Tue Sep 30 20:09:53 GMT 2025