dm_ioctl.c revision 1.32.2.1
1 /* $NetBSD: dm_ioctl.c,v 1.32.2.1 2018/11/26 01:52:30 pgoyette Exp $ */ 2 3 /* 4 * Copyright (c) 2008 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Adam Hamsik. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 #include <sys/cdefs.h> 32 __KERNEL_RCSID(0, "$NetBSD: dm_ioctl.c,v 1.32.2.1 2018/11/26 01:52:30 pgoyette 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->dev_type = 0; 250 dmv->devt = devt; 251 252 dm_table_head_init(&dmv->table_head); 253 254 mutex_init(&dmv->dev_mtx, MUTEX_DEFAULT, IPL_NONE); 255 mutex_init(&dmv->diskp_mtx, MUTEX_DEFAULT, IPL_NONE); 256 cv_init(&dmv->dev_cv, "dm_dev"); 257 258 if (flags & DM_READONLY_FLAG) 259 dmv->flags |= DM_READONLY_FLAG; 260 261 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_MINOR, dmv->minor); 262 263 disk_init(dmv->diskp, dmv->name, &dmdkdriver); 264 disk_attach(dmv->diskp); 265 266 dmv->diskp->dk_info = NULL; 267 268 if ((r = dm_dev_insert(dmv)) != 0) 269 dm_dev_free(dmv); 270 271 DM_ADD_FLAG(flags, DM_EXISTS_FLAG); 272 DM_REMOVE_FLAG(flags, DM_INACTIVE_PRESENT_FLAG); 273 274 /* Increment device counter After creating device */ 275 atomic_inc_32(&dm_dev_counter); 276 277 return r; 278 } 279 280 /* 281 * Get list of created device-mapper devices fromglobal list and 282 * send it to kernel. 283 * 284 * Output dictionary: 285 * 286 * <key>cmd_data</key> 287 * <array> 288 * <dict> 289 * <key>name<key> 290 * <string>...</string> 291 * 292 * <key>dev</key> 293 * <integer>...</integer> 294 * </dict> 295 * </array> 296 * 297 */ 298 int 299 dm_dev_list_ioctl(prop_dictionary_t dm_dict) 300 { 301 prop_array_t dev_list; 302 303 uint32_t flags; 304 305 flags = 0; 306 307 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags); 308 309 dm_dbg_print_flags(flags); 310 311 dev_list = dm_dev_prop_list(); 312 313 prop_dictionary_set(dm_dict, DM_IOCTL_CMD_DATA, dev_list); 314 prop_object_release(dev_list); 315 316 return 0; 317 } 318 319 /* 320 * Rename selected devices old name is in struct dm_ioctl. 321 * newname is taken from dictionary 322 * 323 * <key>cmd_data</key> 324 * <array> 325 * <string>...</string> 326 * </array> 327 */ 328 int 329 dm_dev_rename_ioctl(prop_dictionary_t dm_dict) 330 { 331 prop_array_t cmd_array; 332 dm_dev_t *dmv; 333 334 const char *name, *uuid, *n_name; 335 uint32_t flags, minor; 336 337 name = NULL; 338 uuid = NULL; 339 minor = 0; 340 341 /* Get needed values from dictionary. */ 342 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_NAME, &name); 343 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_UUID, &uuid); 344 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags); 345 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_MINOR, &minor); 346 347 dm_dbg_print_flags(flags); 348 349 cmd_array = prop_dictionary_get(dm_dict, DM_IOCTL_CMD_DATA); 350 351 prop_array_get_cstring_nocopy(cmd_array, 0, &n_name); 352 353 if (strlen(n_name) + 1 > DM_NAME_LEN) 354 return EINVAL; 355 356 if ((dmv = dm_dev_rem(name, uuid, minor)) == NULL) { 357 DM_REMOVE_FLAG(flags, DM_EXISTS_FLAG); 358 return ENOENT; 359 } 360 /* change device name */ 361 /* 362 * XXX How to deal with this change, name only used in 363 * dm_dev_routines, should I add dm_dev_change_name which will run 364 * under the dm_dev_list mutex ? 365 */ 366 strlcpy(dmv->name, n_name, DM_NAME_LEN); 367 368 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_OPEN, dmv->table_head.io_cnt); 369 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_MINOR, dmv->minor); 370 prop_dictionary_set_cstring(dm_dict, DM_IOCTL_UUID, dmv->uuid); 371 372 dm_dev_insert(dmv); 373 374 return 0; 375 } 376 377 /* 378 * Remove device from global list I have to remove active 379 * and inactive tables first. 380 */ 381 int 382 dm_dev_remove_ioctl(prop_dictionary_t dm_dict) 383 { 384 dm_dev_t *dmv; 385 const char *name, *uuid; 386 uint32_t flags, minor; 387 device_t devt; 388 389 flags = 0; 390 name = NULL; 391 uuid = NULL; 392 393 /* Get needed values from dictionary. */ 394 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_NAME, &name); 395 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_UUID, &uuid); 396 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags); 397 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_MINOR, &minor); 398 399 dm_dbg_print_flags(flags); 400 401 /* 402 * This seems as hack to me, probably use routine dm_dev_get_devt to 403 * atomicaly get devt from device. 404 */ 405 if ((dmv = dm_dev_lookup(name, uuid, minor)) == NULL) { 406 DM_REMOVE_FLAG(flags, DM_EXISTS_FLAG); 407 return ENOENT; 408 } 409 devt = dmv->devt; 410 411 dm_dev_unbusy(dmv); 412 413 /* 414 * This will call dm_detach routine which will actually removes 415 * device. 416 */ 417 return config_detach(devt, DETACH_QUIET); 418 } 419 420 /* 421 * Return actual state of device to libdevmapper. 422 */ 423 int 424 dm_dev_status_ioctl(prop_dictionary_t dm_dict) 425 { 426 dm_dev_t *dmv; 427 const char *name, *uuid; 428 uint32_t flags, j, minor; 429 430 name = NULL; 431 uuid = NULL; 432 flags = 0; 433 j = 0; 434 435 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_NAME, &name); 436 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_UUID, &uuid); 437 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags); 438 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_MINOR, &minor); 439 440 if ((dmv = dm_dev_lookup(name, uuid, minor)) == NULL) { 441 DM_REMOVE_FLAG(flags, DM_EXISTS_FLAG); 442 return ENOENT; 443 } 444 dm_dbg_print_flags(dmv->flags); 445 446 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_OPEN, dmv->table_head.io_cnt); 447 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_MINOR, dmv->minor); 448 prop_dictionary_set_cstring(dm_dict, DM_IOCTL_UUID, dmv->uuid); 449 450 if (dmv->flags & DM_SUSPEND_FLAG) 451 DM_ADD_FLAG(flags, DM_SUSPEND_FLAG); 452 453 /* 454 * Add status flags for tables I have to check both active and 455 * inactive tables. 456 */ 457 if ((j = dm_table_get_target_count(&dmv->table_head, DM_TABLE_ACTIVE))) { 458 DM_ADD_FLAG(flags, DM_ACTIVE_PRESENT_FLAG); 459 } else 460 DM_REMOVE_FLAG(flags, DM_ACTIVE_PRESENT_FLAG); 461 462 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_TARGET_COUNT, j); 463 464 if (dm_table_get_target_count(&dmv->table_head, DM_TABLE_INACTIVE)) 465 DM_ADD_FLAG(flags, DM_INACTIVE_PRESENT_FLAG); 466 else 467 DM_REMOVE_FLAG(flags, DM_INACTIVE_PRESENT_FLAG); 468 469 dm_dev_unbusy(dmv); 470 471 return 0; 472 } 473 474 /* 475 * Set only flag to suggest that device is suspended. This call is 476 * not supported in NetBSD. 477 * 478 */ 479 int 480 dm_dev_suspend_ioctl(prop_dictionary_t dm_dict) 481 { 482 dm_dev_t *dmv; 483 const char *name, *uuid; 484 uint32_t flags, minor; 485 486 name = NULL; 487 uuid = NULL; 488 flags = 0; 489 490 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_NAME, &name); 491 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_UUID, &uuid); 492 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags); 493 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_MINOR, &minor); 494 495 if ((dmv = dm_dev_lookup(name, uuid, minor)) == NULL) { 496 DM_REMOVE_FLAG(flags, DM_EXISTS_FLAG); 497 return ENOENT; 498 } 499 atomic_or_32(&dmv->flags, DM_SUSPEND_FLAG); 500 501 dm_dbg_print_flags(dmv->flags); 502 503 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_OPEN, dmv->table_head.io_cnt); 504 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_FLAGS, dmv->flags); 505 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_MINOR, dmv->minor); 506 507 dm_dev_unbusy(dmv); 508 509 /* Add flags to dictionary flag after dmv -> dict copy */ 510 DM_ADD_FLAG(flags, DM_EXISTS_FLAG); 511 512 return 0; 513 } 514 515 /* 516 * Simulate Linux behaviour better and switch tables here and not in 517 * dm_table_load_ioctl. 518 */ 519 int 520 dm_dev_resume_ioctl(prop_dictionary_t dm_dict) 521 { 522 dm_dev_t *dmv; 523 const char *name, *uuid; 524 uint32_t flags, minor; 525 526 name = NULL; 527 uuid = NULL; 528 flags = 0; 529 530 /* 531 * char *xml; xml = prop_dictionary_externalize(dm_dict); 532 * printf("%s\n",xml); 533 */ 534 535 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_NAME, &name); 536 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_UUID, &uuid); 537 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags); 538 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_MINOR, &minor); 539 540 /* Remove device from global device list */ 541 if ((dmv = dm_dev_lookup(name, uuid, minor)) == NULL) { 542 DM_REMOVE_FLAG(flags, DM_EXISTS_FLAG); 543 return ENOENT; 544 } 545 546 /* Make inactive table active, if it exists */ 547 if (dmv->flags & DM_INACTIVE_PRESENT_FLAG) 548 dm_table_switch_tables(&dmv->table_head); 549 550 atomic_and_32(&dmv->flags, ~(DM_SUSPEND_FLAG | DM_INACTIVE_PRESENT_FLAG)); 551 atomic_or_32(&dmv->flags, DM_ACTIVE_PRESENT_FLAG); 552 553 DM_ADD_FLAG(flags, DM_EXISTS_FLAG); 554 555 dmgetproperties(dmv->diskp, &dmv->table_head); 556 557 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_OPEN, dmv->table_head.io_cnt); 558 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_FLAGS, flags); 559 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_MINOR, dmv->minor); 560 561 dm_dev_unbusy(dmv); 562 563 /* Destroy inactive table after resume. */ 564 dm_table_destroy(&dmv->table_head, DM_TABLE_INACTIVE); 565 566 return 0; 567 } 568 569 /* 570 * Table management routines 571 * lvm2tools doens't send name/uuid to kernel with table 572 * for lookup I have to use minor number. 573 */ 574 575 /* 576 * Remove inactive table from device. Routines which work's with inactive tables 577 * doesn't need to synchronise with dmstrategy. They can synchronise themselves with mutex?. 578 * 579 */ 580 int 581 dm_table_clear_ioctl(prop_dictionary_t dm_dict) 582 { 583 dm_dev_t *dmv; 584 const char *name, *uuid; 585 uint32_t flags, minor; 586 587 dmv = NULL; 588 name = NULL; 589 uuid = NULL; 590 flags = 0; 591 minor = 0; 592 593 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_NAME, &name); 594 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_UUID, &uuid); 595 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags); 596 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_MINOR, &minor); 597 598 aprint_debug("Clearing inactive table from device: %s--%s\n", 599 name, uuid); 600 601 if ((dmv = dm_dev_lookup(name, uuid, minor)) == NULL) { 602 DM_REMOVE_FLAG(flags, DM_EXISTS_FLAG); 603 return ENOENT; 604 } 605 /* Select unused table */ 606 dm_table_destroy(&dmv->table_head, DM_TABLE_INACTIVE); 607 608 atomic_and_32(&dmv->flags, ~DM_INACTIVE_PRESENT_FLAG); 609 610 dm_dev_unbusy(dmv); 611 612 return 0; 613 } 614 615 /* 616 * Get list of physical devices for active table. 617 * Get dev_t from pdev vnode and insert it into cmd_array. 618 * 619 * XXX. This function is called from lvm2tools to get information 620 * about physical devices, too e.g. during vgcreate. 621 */ 622 int 623 dm_table_deps_ioctl(prop_dictionary_t dm_dict) 624 { 625 dm_dev_t *dmv; 626 dm_table_t *tbl; 627 dm_table_entry_t *table_en; 628 629 prop_array_t cmd_array; 630 const char *name, *uuid; 631 uint32_t flags, minor; 632 633 int table_type; 634 635 name = NULL; 636 uuid = NULL; 637 dmv = NULL; 638 flags = 0; 639 640 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_NAME, &name); 641 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_UUID, &uuid); 642 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags); 643 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_MINOR, &minor); 644 645 /* create array for dev_t's */ 646 cmd_array = prop_array_create(); 647 648 if ((dmv = dm_dev_lookup(name, uuid, minor)) == NULL) { 649 DM_REMOVE_FLAG(flags, DM_EXISTS_FLAG); 650 return ENOENT; 651 } 652 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_MINOR, dmv->minor); 653 prop_dictionary_set_cstring(dm_dict, DM_IOCTL_NAME, dmv->name); 654 prop_dictionary_set_cstring(dm_dict, DM_IOCTL_UUID, dmv->uuid); 655 656 aprint_debug("Getting table deps for device: %s\n", dmv->name); 657 658 /* 659 * if DM_QUERY_INACTIVE_TABLE_FLAG is passed we need to query 660 * INACTIVE TABLE 661 */ 662 if (flags & DM_QUERY_INACTIVE_TABLE_FLAG) 663 table_type = DM_TABLE_INACTIVE; 664 else 665 table_type = DM_TABLE_ACTIVE; 666 667 tbl = dm_table_get_entry(&dmv->table_head, table_type); 668 669 SLIST_FOREACH(table_en, tbl, next) 670 table_en->target->deps(table_en, cmd_array); 671 672 dm_table_release(&dmv->table_head, table_type); 673 dm_dev_unbusy(dmv); 674 675 prop_dictionary_set(dm_dict, DM_IOCTL_CMD_DATA, cmd_array); 676 prop_object_release(cmd_array); 677 678 return 0; 679 } 680 681 /* 682 * Load new table/tables to device. 683 * Call apropriate target init routine open all physical pdev's and 684 * link them to device. For other targets mirror, strip, snapshot 685 * etc. also add dependency devices to upcalls list. 686 * 687 * Load table to inactive slot table are switched in dm_device_resume_ioctl. 688 * This simulates Linux behaviour better there should not be any difference. 689 * 690 */ 691 int 692 dm_table_load_ioctl(prop_dictionary_t dm_dict) 693 { 694 dm_dev_t *dmv; 695 dm_table_entry_t *table_en, *last_table; 696 dm_table_t *tbl; 697 dm_target_t *target; 698 699 prop_object_iterator_t iter; 700 prop_array_t cmd_array; 701 prop_dictionary_t target_dict; 702 703 const char *name, *uuid, *type; 704 705 uint32_t flags, ret, minor; 706 707 char *str; 708 709 ret = 0; 710 flags = 0; 711 name = NULL; 712 uuid = NULL; 713 dmv = NULL; 714 last_table = NULL; 715 str = NULL; 716 717 /* 718 * char *xml; xml = prop_dictionary_externalize(dm_dict); 719 * printf("%s\n",xml); 720 */ 721 722 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_NAME, &name); 723 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_UUID, &uuid); 724 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags); 725 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_MINOR, &minor); 726 727 cmd_array = prop_dictionary_get(dm_dict, DM_IOCTL_CMD_DATA); 728 iter = prop_array_iterator(cmd_array); 729 dm_dbg_print_flags(flags); 730 731 if ((dmv = dm_dev_lookup(name, uuid, minor)) == NULL) { 732 DM_REMOVE_FLAG(flags, DM_EXISTS_FLAG); 733 prop_object_iterator_release(iter); 734 return ENOENT; 735 } 736 aprint_debug("Loading table to device: %s--%d\n", name, 737 dmv->table_head.cur_active_table); 738 739 /* 740 * I have to check if this table slot is not used by another table list. 741 * if it is used I should free them. 742 */ 743 if (dmv->flags & DM_INACTIVE_PRESENT_FLAG) 744 dm_table_destroy(&dmv->table_head, DM_TABLE_INACTIVE); 745 746 dm_dbg_print_flags(dmv->flags); 747 tbl = dm_table_get_entry(&dmv->table_head, DM_TABLE_INACTIVE); 748 749 aprint_debug("dmv->name = %s\n", dmv->name); 750 751 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_MINOR, dmv->minor); 752 753 while ((target_dict = prop_object_iterator_next(iter)) != NULL) { 754 755 prop_dictionary_get_cstring_nocopy(target_dict, 756 DM_TABLE_TYPE, &type); 757 /* 758 * If we want to deny table with 2 or more different 759 * target we should do it here 760 */ 761 if (((target = dm_target_lookup(type)) == NULL) && 762 ((target = dm_target_autoload(type)) == NULL)) { 763 dm_table_release(&dmv->table_head, DM_TABLE_INACTIVE); 764 dm_dev_unbusy(dmv); 765 prop_object_iterator_release(iter); 766 return ENOENT; 767 } 768 table_en = kmem_alloc(sizeof(dm_table_entry_t), KM_SLEEP); 769 prop_dictionary_get_uint64(target_dict, DM_TABLE_START, 770 &table_en->start); 771 prop_dictionary_get_uint64(target_dict, DM_TABLE_LENGTH, 772 &table_en->length); 773 774 table_en->target = target; 775 table_en->dm_dev = dmv; 776 table_en->target_config = NULL; 777 778 /* 779 * There is a parameter string after dm_target_spec 780 * structure which points to /dev/wd0a 284 part of 781 * table. String str points to this text. This can be 782 * null and therefore it should be checked before we try to 783 * use it. 784 */ 785 prop_dictionary_get_cstring(target_dict, 786 DM_TABLE_PARAMS, (char **) &str); 787 788 if (SLIST_EMPTY(tbl) || last_table == NULL) 789 /* insert this table to head */ 790 SLIST_INSERT_HEAD(tbl, table_en, next); 791 else 792 SLIST_INSERT_AFTER(last_table, table_en, next); 793 794 /* 795 * Params string is different for every target, 796 * therfore I have to pass it to target init 797 * routine and parse parameters there. 798 */ 799 800 if ((ret = target->init(dmv, &table_en->target_config, 801 str)) != 0) { 802 803 dm_table_release(&dmv->table_head, DM_TABLE_INACTIVE); 804 dm_table_destroy(&dmv->table_head, DM_TABLE_INACTIVE); 805 free(str, M_TEMP); 806 807 dm_dev_unbusy(dmv); 808 prop_object_iterator_release(iter); 809 return ret; 810 } 811 last_table = table_en; 812 free(str, M_TEMP); 813 } 814 prop_object_iterator_release(iter); 815 816 DM_ADD_FLAG(flags, DM_INACTIVE_PRESENT_FLAG); 817 atomic_or_32(&dmv->flags, DM_INACTIVE_PRESENT_FLAG); 818 819 dm_table_release(&dmv->table_head, DM_TABLE_INACTIVE); 820 dm_dev_unbusy(dmv); 821 return 0; 822 } 823 824 /* 825 * Get description of all tables loaded to device from kernel 826 * and send it to libdevmapper. 827 * 828 * Output dictionary for every table: 829 * 830 * <key>cmd_data</key> 831 * <array> 832 * <dict> 833 * <key>type<key> 834 * <string>...</string> 835 * 836 * <key>start</key> 837 * <integer>...</integer> 838 * 839 * <key>length</key> 840 * <integer>...</integer> 841 * 842 * <key>params</key> 843 * <string>...</string> 844 * </dict> 845 * </array> 846 * 847 */ 848 int 849 dm_table_status_ioctl(prop_dictionary_t dm_dict) 850 { 851 dm_dev_t *dmv; 852 dm_table_t *tbl; 853 dm_table_entry_t *table_en; 854 855 prop_array_t cmd_array; 856 prop_dictionary_t target_dict; 857 858 uint32_t minor, flags; 859 860 const char *name, *uuid; 861 char *params; 862 int table_type; 863 864 dmv = NULL; 865 uuid = NULL; 866 name = NULL; 867 params = NULL; 868 flags = 0; 869 870 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_NAME, &name); 871 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_UUID, &uuid); 872 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags); 873 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_MINOR, &minor); 874 875 cmd_array = prop_array_create(); 876 877 if ((dmv = dm_dev_lookup(name, uuid, minor)) == NULL) { 878 DM_REMOVE_FLAG(flags, DM_EXISTS_FLAG); 879 return ENOENT; 880 } 881 /* 882 * if DM_QUERY_INACTIVE_TABLE_FLAG is passed we need to query 883 * INACTIVE TABLE 884 */ 885 if (flags & DM_QUERY_INACTIVE_TABLE_FLAG) 886 table_type = DM_TABLE_INACTIVE; 887 else 888 table_type = DM_TABLE_ACTIVE; 889 890 if (dm_table_get_target_count(&dmv->table_head, DM_TABLE_ACTIVE)) 891 DM_ADD_FLAG(flags, DM_ACTIVE_PRESENT_FLAG); 892 else { 893 DM_REMOVE_FLAG(flags, DM_ACTIVE_PRESENT_FLAG); 894 895 if (dm_table_get_target_count(&dmv->table_head, DM_TABLE_INACTIVE)) 896 DM_ADD_FLAG(flags, DM_INACTIVE_PRESENT_FLAG); 897 else { 898 DM_REMOVE_FLAG(flags, DM_INACTIVE_PRESENT_FLAG); 899 } 900 } 901 902 if (dmv->flags & DM_SUSPEND_FLAG) 903 DM_ADD_FLAG(flags, DM_SUSPEND_FLAG); 904 905 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_MINOR, dmv->minor); 906 907 aprint_debug("Status of device tables: %s--%d\n", 908 name, dmv->table_head.cur_active_table); 909 910 tbl = dm_table_get_entry(&dmv->table_head, table_type); 911 912 SLIST_FOREACH(table_en, tbl, next) { 913 target_dict = prop_dictionary_create(); 914 aprint_debug("%016" PRIu64 ", length %016" PRIu64 915 ", target %s\n", table_en->start, table_en->length, 916 table_en->target->name); 917 918 prop_dictionary_set_uint64(target_dict, DM_TABLE_START, 919 table_en->start); 920 prop_dictionary_set_uint64(target_dict, DM_TABLE_LENGTH, 921 table_en->length); 922 923 prop_dictionary_set_cstring(target_dict, DM_TABLE_TYPE, 924 table_en->target->name); 925 926 /* dm_table_get_cur_actv.table ?? */ 927 prop_dictionary_set_int32(target_dict, DM_TABLE_STAT, 928 dmv->table_head.cur_active_table); 929 930 if (flags & DM_STATUS_TABLE_FLAG) { 931 params = table_en->target->status 932 (table_en->target_config); 933 934 if (params != NULL) { 935 prop_dictionary_set_cstring(target_dict, 936 DM_TABLE_PARAMS, params); 937 938 kmem_free(params, DM_MAX_PARAMS_SIZE); 939 } 940 } 941 prop_array_add(cmd_array, target_dict); 942 prop_object_release(target_dict); 943 } 944 945 dm_table_release(&dmv->table_head, table_type); 946 dm_dev_unbusy(dmv); 947 948 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_FLAGS, flags); 949 prop_dictionary_set(dm_dict, DM_IOCTL_CMD_DATA, cmd_array); 950 prop_object_release(cmd_array); 951 952 return 0; 953 } 954 955 /* 956 * For every call I have to set kernel driver version. 957 * Because I can have commands supported only in other 958 * newer/later version. This routine is called for every 959 * ioctl command. 960 */ 961 int 962 dm_check_version(prop_dictionary_t dm_dict) 963 { 964 size_t i; 965 uint32_t dm_version[3]; 966 prop_array_t ver; 967 968 ver = prop_dictionary_get(dm_dict, DM_IOCTL_VERSION); 969 970 for (i = 0; i < 3; i++) 971 prop_array_get_uint32(ver, i, &dm_version[i]); 972 973 if (DM_VERSION_MAJOR != dm_version[0] || DM_VERSION_MINOR < dm_version[1]) { 974 aprint_debug("libdevmapper/kernel version mismatch " 975 "kernel: %d.%d.%d libdevmapper: %d.%d.%d\n", 976 DM_VERSION_MAJOR, DM_VERSION_MINOR, DM_VERSION_PATCHLEVEL, 977 dm_version[0], dm_version[1], dm_version[2]); 978 979 return EIO; 980 } 981 prop_array_set_uint32(ver, 0, DM_VERSION_MAJOR); 982 prop_array_set_uint32(ver, 1, DM_VERSION_MINOR); 983 prop_array_set_uint32(ver, 2, DM_VERSION_PATCHLEVEL); 984 985 prop_dictionary_set(dm_dict, DM_IOCTL_VERSION, ver); 986 987 return 0; 988 } 989
Indexes created Tue Sep 30 20:09:53 GMT 2025