1 /* $NetBSD: dm_ioctl.c,v 1.21 2010/02/25 20:48:58 jakllsch 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 depends 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/device.h> 85 #include <sys/devicestat.h> 86 #include <sys/devfs.h> 87 #include <sys/disk.h> 88 #include <sys/disklabel.h> 89 #include <sys/malloc.h> 90 #include <sys/udev.h> 91 #include <sys/vnode.h> 92 93 #include "netbsd-dm.h" 94 #include "dm.h" 95 96 static uint64_t sc_minor_num; 97 extern struct dev_ops dm_ops; 98 extern struct devfs_bitmap dm_minor_bitmap; 99 uint64_t dm_dev_counter; 100 101 #if 0 102 /* 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 #endif 110 111 #define DM_REMOVE_FLAG(flag, name) do { \ 112 prop_dictionary_get_uint32(dm_dict,DM_IOCTL_FLAGS,&flag); \ 113 flag &= ~name; \ 114 prop_dictionary_set_uint32(dm_dict,DM_IOCTL_FLAGS,flag); \ 115 } while (/*CONSTCOND*/0) 116 117 #define DM_ADD_FLAG(flag, name) do { \ 118 prop_dictionary_get_uint32(dm_dict,DM_IOCTL_FLAGS,&flag); \ 119 flag |= name; \ 120 prop_dictionary_set_uint32(dm_dict,DM_IOCTL_FLAGS,flag); \ 121 } while (/*CONSTCOND*/0) 122 123 static int dm_dbg_print_flags(int); 124 125 /* 126 * Print flags sent to the kernel from libevmapper. 127 */ 128 static int 129 dm_dbg_print_flags(int flags) 130 { 131 aprint_debug("dbg_print --- %d\n", flags); 132 133 if (flags & DM_READONLY_FLAG) 134 aprint_debug("dbg_flags: DM_READONLY_FLAG set In/Out\n"); 135 136 if (flags & DM_SUSPEND_FLAG) 137 aprint_debug("dbg_flags: DM_SUSPEND_FLAG set In/Out \n"); 138 139 if (flags & DM_PERSISTENT_DEV_FLAG) 140 aprint_debug("db_flags: DM_PERSISTENT_DEV_FLAG set In\n"); 141 142 if (flags & DM_STATUS_TABLE_FLAG) 143 aprint_debug("dbg_flags: DM_STATUS_TABLE_FLAG set In\n"); 144 145 if (flags & DM_ACTIVE_PRESENT_FLAG) 146 aprint_debug("dbg_flags: DM_ACTIVE_PRESENT_FLAG set Out\n"); 147 148 if (flags & DM_INACTIVE_PRESENT_FLAG) 149 aprint_debug("dbg_flags: DM_INACTIVE_PRESENT_FLAG set Out\n"); 150 151 if (flags & DM_BUFFER_FULL_FLAG) 152 aprint_debug("dbg_flags: DM_BUFFER_FULL_FLAG set Out\n"); 153 154 if (flags & DM_SKIP_BDGET_FLAG) 155 aprint_debug("dbg_flags: DM_SKIP_BDGET_FLAG set In\n"); 156 157 if (flags & DM_SKIP_LOCKFS_FLAG) 158 aprint_debug("dbg_flags: DM_SKIP_LOCKFS_FLAG set In\n"); 159 160 if (flags & DM_NOFLUSH_FLAG) 161 aprint_debug("dbg_flags: DM_NOFLUSH_FLAG set In\n"); 162 163 return 0; 164 } 165 /* 166 * Get version ioctl call I do it as default therefore this 167 * function is unused now. 168 */ 169 int 170 dm_get_version_ioctl(prop_dictionary_t dm_dict) 171 { 172 173 return 0; 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 * Create in-kernel entry for device. Device attributes such as name, uuid are 199 * taken from proplib dictionary. 200 * 201 */ 202 int 203 dm_dev_create_ioctl(prop_dictionary_t dm_dict) 204 { 205 dm_dev_t *dmv; 206 const char *name, *uuid; 207 char name_buf[MAXPATHLEN]; 208 int r, flags, dm_minor; 209 210 r = 0; 211 flags = 0; 212 name = NULL; 213 uuid = NULL; 214 215 /* Get needed values from dictionary. */ 216 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_NAME, &name); 217 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_UUID, &uuid); 218 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags); 219 220 dm_dbg_print_flags(flags); 221 222 /* Lookup name and uuid if device already exist quit. */ 223 if ((dmv = dm_dev_lookup(name, uuid, -1)) != NULL) { 224 DM_ADD_FLAG(flags, DM_EXISTS_FLAG); /* Device already exists */ 225 dm_dev_unbusy(dmv); 226 return EEXIST; 227 } 228 #if 0 229 if ((devt = config_attach_pseudo(&dm_cfdata)) == NULL) { 230 aprint_error("Unable to attach pseudo device dm/%s\n", name); 231 return (ENOMEM); 232 } 233 #endif 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 dm_minor = devfs_clone_bitmap_get(&dm_minor_bitmap, 0); 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; 250 251 dm_table_head_init(&dmv->table_head); 252 253 lockinit(&dmv->dev_mtx, "dmdev", 0, LK_CANRECURSE); 254 lockinit(&dmv->diskp_mtx, "dmdisk", 0, LK_CANRECURSE); 255 cv_init(&dmv->dev_cv, "dm_dev"); 256 257 if (flags & DM_READONLY_FLAG) 258 dmv->flags |= DM_READONLY_FLAG; 259 260 aprint_debug("Creating device dm/%s\n", name); 261 ksnprintf(name_buf, sizeof(name_buf), "mapper/%s", dmv->name); 262 263 devstat_add_entry(&dmv->stats, name, 0, DEV_BSIZE, 264 DEVSTAT_NO_ORDERED_TAGS, 265 DEVSTAT_TYPE_DIRECT | DEVSTAT_TYPE_IF_OTHER, 266 DEVSTAT_PRIORITY_DISK); 267 268 dmv->devt = disk_create_named(name_buf, dm_minor, dmv->diskp, &dm_ops); 269 dmv->minor = minor(dmv->devt); 270 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_MINOR, dmv->minor); 271 udev_dict_set_cstr(dmv->devt, "subsystem", "disk"); 272 273 if ((r = dm_dev_insert(dmv)) != 0) 274 dm_dev_free(dmv); 275 276 DM_ADD_FLAG(flags, DM_EXISTS_FLAG); 277 DM_REMOVE_FLAG(flags, DM_INACTIVE_PRESENT_FLAG); 278 279 /* Increment device counter After creating device */ 280 ++dm_dev_counter; /* XXX: was atomic 64 */ 281 282 return r; 283 } 284 /* 285 * Get list of created device-mapper devices fromglobal list and 286 * send it to kernel. 287 * 288 * Output dictionary: 289 * 290 * <key>cmd_data</key> 291 * <array> 292 * <dict> 293 * <key>name<key> 294 * <string>...</string> 295 * 296 * <key>dev</key> 297 * <integer>...</integer> 298 * </dict> 299 * </array> 300 * 301 */ 302 int 303 dm_dev_list_ioctl(prop_dictionary_t dm_dict) 304 { 305 prop_array_t dev_list; 306 307 uint32_t flags; 308 309 flags = 0; 310 311 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags); 312 313 dm_dbg_print_flags(flags); 314 315 dev_list = dm_dev_prop_list(); 316 317 prop_dictionary_set(dm_dict, DM_IOCTL_CMD_DATA, dev_list); 318 prop_object_release(dev_list); 319 320 return 0; 321 } 322 /* 323 * Rename selected devices old name is in struct dm_ioctl. 324 * newname is taken from dictionary 325 * 326 * <key>cmd_data</key> 327 * <array> 328 * <string>...</string> 329 * </array> 330 */ 331 int 332 dm_dev_rename_ioctl(prop_dictionary_t dm_dict) 333 { 334 prop_array_t cmd_array; 335 dm_dev_t *dmv; 336 337 const char *name, *uuid, *n_name; 338 uint32_t flags, minor; 339 340 name = NULL; 341 uuid = NULL; 342 minor = 0; 343 344 /* Get needed values from dictionary. */ 345 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_NAME, &name); 346 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_UUID, &uuid); 347 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags); 348 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_MINOR, &minor); 349 350 dm_dbg_print_flags(flags); 351 352 cmd_array = prop_dictionary_get(dm_dict, DM_IOCTL_CMD_DATA); 353 354 prop_array_get_cstring_nocopy(cmd_array, 0, &n_name); 355 356 if (strlen(n_name) + 1 > DM_NAME_LEN) 357 return EINVAL; 358 359 if ((dmv = dm_dev_rem(name, uuid, minor)) == NULL) { 360 DM_REMOVE_FLAG(flags, DM_EXISTS_FLAG); 361 return ENOENT; 362 } 363 /* change device name */ 364 /* 365 * XXX How to deal with this change, name only used in 366 * dm_dev_routines, should I add dm_dev_change_name which will run 367 * under the dm_dev_list mutex ? 368 */ 369 strlcpy(dmv->name, n_name, DM_NAME_LEN); 370 371 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_OPEN, dmv->table_head.io_cnt); 372 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_MINOR, dmv->minor); 373 prop_dictionary_set_cstring(dm_dict, DM_IOCTL_UUID, dmv->uuid); 374 375 dm_dev_insert(dmv); 376 377 return 0; 378 } 379 /* 380 * Remove device from global list I have to remove active 381 * and inactive tables first. 382 */ 383 int 384 dm_dev_remove_ioctl(prop_dictionary_t dm_dict) 385 { 386 dm_dev_t *dmv; 387 const char *name, *uuid; 388 uint32_t flags, minor; 389 390 flags = 0; 391 name = NULL; 392 uuid = NULL; 393 394 /* Get needed values from dictionary. */ 395 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_NAME, &name); 396 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_UUID, &uuid); 397 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags); 398 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_MINOR, &minor); 399 400 dm_dbg_print_flags(flags); 401 402 /* 403 * This seems as hack to me, probably use routine dm_dev_get_devt to 404 * atomicaly get devt from device. 405 */ 406 if ((dmv = dm_dev_lookup(name, uuid, minor)) == NULL) { 407 DM_REMOVE_FLAG(flags, DM_EXISTS_FLAG); 408 return ENOENT; 409 } 410 411 dm_dev_unbusy(dmv); 412 413 /* 414 * This will call dm_detach routine which will actually removes 415 * device. 416 */ 417 return dm_detach(dmv); 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 * Set only flag to suggest that device is suspended. This call is 474 * not supported in NetBSD. 475 * 476 */ 477 int 478 dm_dev_suspend_ioctl(prop_dictionary_t dm_dict) 479 { 480 dm_dev_t *dmv; 481 const char *name, *uuid; 482 uint32_t flags, minor; 483 484 name = NULL; 485 uuid = NULL; 486 flags = 0; 487 488 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_NAME, &name); 489 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_UUID, &uuid); 490 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags); 491 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_MINOR, &minor); 492 493 if ((dmv = dm_dev_lookup(name, uuid, minor)) == NULL) { 494 DM_REMOVE_FLAG(flags, DM_EXISTS_FLAG); 495 return ENOENT; 496 } 497 atomic_set_int(&dmv->flags, DM_SUSPEND_FLAG); 498 499 dm_dbg_print_flags(dmv->flags); 500 501 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_OPEN, dmv->table_head.io_cnt); 502 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_FLAGS, dmv->flags); 503 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_MINOR, dmv->minor); 504 505 dm_dev_unbusy(dmv); 506 507 /* Add flags to dictionary flag after dmv -> dict copy */ 508 DM_ADD_FLAG(flags, DM_EXISTS_FLAG); 509 510 return 0; 511 } 512 /* 513 * Simulate Linux behaviour better and switch tables here and not in 514 * dm_table_load_ioctl. 515 */ 516 int 517 dm_dev_resume_ioctl(prop_dictionary_t dm_dict) 518 { 519 dm_dev_t *dmv; 520 const char *name, *uuid; 521 uint32_t flags, minor; 522 523 name = NULL; 524 uuid = NULL; 525 flags = 0; 526 527 /* 528 * char *xml; xml = prop_dictionary_externalize(dm_dict); 529 * printf("%s\n",xml); 530 */ 531 532 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_NAME, &name); 533 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_UUID, &uuid); 534 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags); 535 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_MINOR, &minor); 536 537 /* Remove device from global device list */ 538 if ((dmv = dm_dev_lookup(name, uuid, minor)) == NULL) { 539 DM_REMOVE_FLAG(flags, DM_EXISTS_FLAG); 540 return ENOENT; 541 } 542 atomic_clear_int(&dmv->flags, (DM_SUSPEND_FLAG | DM_INACTIVE_PRESENT_FLAG)); 543 atomic_set_int(&dmv->flags, DM_ACTIVE_PRESENT_FLAG); 544 545 dm_table_switch_tables(&dmv->table_head); 546 547 DM_ADD_FLAG(flags, DM_EXISTS_FLAG); 548 549 dmsetdiskinfo(dmv->diskp, &dmv->table_head); 550 551 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_OPEN, dmv->table_head.io_cnt); 552 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_FLAGS, flags); 553 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_MINOR, dmv->minor); 554 555 dm_dev_unbusy(dmv); 556 557 /* Destroy inactive table after resume. */ 558 dm_table_destroy(&dmv->table_head, DM_TABLE_INACTIVE); 559 560 return 0; 561 } 562 /* 563 * Table management routines 564 * lvm2tools doens't send name/uuid to kernel with table 565 * for lookup I have to use minor number. 566 */ 567 568 /* 569 * Remove inactive table from device. Routines which work's with inactive tables 570 * doesn't need to synchronise with dmstrategy. They can synchronise themselves with mutex?. 571 * 572 */ 573 int 574 dm_table_clear_ioctl(prop_dictionary_t dm_dict) 575 { 576 dm_dev_t *dmv; 577 const char *name, *uuid; 578 uint32_t flags, minor; 579 580 dmv = NULL; 581 name = NULL; 582 uuid = NULL; 583 flags = 0; 584 minor = 0; 585 586 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_NAME, &name); 587 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_UUID, &uuid); 588 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags); 589 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_MINOR, &minor); 590 591 aprint_debug("Clearing inactive table from device: %s--%s\n", 592 name, uuid); 593 594 if ((dmv = dm_dev_lookup(name, uuid, minor)) == NULL) { 595 DM_REMOVE_FLAG(flags, DM_EXISTS_FLAG); 596 return ENOENT; 597 } 598 /* Select unused table */ 599 dm_table_destroy(&dmv->table_head, DM_TABLE_INACTIVE); 600 601 atomic_clear_int(&dmv->flags, DM_INACTIVE_PRESENT_FLAG); 602 603 dm_dev_unbusy(dmv); 604 605 return 0; 606 } 607 /* 608 * Get list of physical devices for active table. 609 * Get dev_t from pdev vnode and insert it into cmd_array. 610 * 611 * XXX. This function is called from lvm2tools to get information 612 * about physical devices, too e.g. during vgcreate. 613 */ 614 int 615 dm_table_deps_ioctl(prop_dictionary_t dm_dict) 616 { 617 dm_dev_t *dmv; 618 dm_table_t *tbl; 619 dm_table_entry_t *table_en; 620 621 prop_array_t cmd_array; 622 const char *name, *uuid; 623 uint32_t flags, minor; 624 625 int table_type; 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 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_MINOR, dmv->minor); 648 prop_dictionary_set_cstring(dm_dict, DM_IOCTL_NAME, dmv->name); 649 prop_dictionary_set_cstring(dm_dict, DM_IOCTL_UUID, dmv->uuid); 650 651 aprint_debug("Getting table deps for device: %s\n", dmv->name); 652 653 /* 654 * if DM_QUERY_INACTIVE_TABLE_FLAG is passed we need to query 655 * INACTIVE TABLE 656 */ 657 if (flags & DM_QUERY_INACTIVE_TABLE_FLAG) 658 table_type = DM_TABLE_INACTIVE; 659 else 660 table_type = DM_TABLE_ACTIVE; 661 662 tbl = dm_table_get_entry(&dmv->table_head, table_type); 663 664 SLIST_FOREACH(table_en, tbl, next) 665 table_en->target->deps(table_en, cmd_array); 666 667 dm_table_release(&dmv->table_head, table_type); 668 dm_dev_unbusy(dmv); 669 670 prop_dictionary_set(dm_dict, DM_IOCTL_CMD_DATA, cmd_array); 671 prop_object_release(cmd_array); 672 673 return 0; 674 } 675 /* 676 * Load new table/tables to device. 677 * Call apropriate target init routine open all physical pdev's and 678 * link them to device. For other targets mirror, strip, snapshot 679 * etc. also add dependency devices to upcalls list. 680 * 681 * Load table to inactive slot table are switched in dm_device_resume_ioctl. 682 * This simulates Linux behaviour better there should not be any difference. 683 * 684 */ 685 int 686 dm_table_load_ioctl(prop_dictionary_t dm_dict) 687 { 688 dm_dev_t *dmv; 689 dm_table_entry_t *table_en, *last_table; 690 dm_table_t *tbl; 691 dm_target_t *target; 692 693 prop_object_iterator_t iter; 694 prop_array_t cmd_array; 695 prop_dictionary_t target_dict; 696 697 const char *name, *uuid, *type; 698 699 uint32_t flags, ret, minor; 700 701 char *str; 702 703 ret = 0; 704 flags = 0; 705 name = NULL; 706 uuid = NULL; 707 dmv = NULL; 708 last_table = NULL; 709 str = NULL; 710 711 /* 712 * char *xml; xml = prop_dictionary_externalize(dm_dict); 713 * printf("%s\n",xml); 714 */ 715 716 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_NAME, &name); 717 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_UUID, &uuid); 718 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags); 719 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_MINOR, &minor); 720 721 cmd_array = prop_dictionary_get(dm_dict, DM_IOCTL_CMD_DATA); 722 iter = prop_array_iterator(cmd_array); 723 dm_dbg_print_flags(flags); 724 725 if ((dmv = dm_dev_lookup(name, uuid, minor)) == NULL) { 726 DM_REMOVE_FLAG(flags, DM_EXISTS_FLAG); 727 return ENOENT; 728 } 729 aprint_debug("Loading table to device: %s--%d\n", name, 730 dmv->table_head.cur_active_table); 731 732 /* 733 * I have to check if this table slot is not used by another table list. 734 * if it is used I should free them. 735 */ 736 if (dmv->flags & DM_INACTIVE_PRESENT_FLAG) 737 dm_table_destroy(&dmv->table_head, DM_TABLE_INACTIVE); 738 739 dm_dbg_print_flags(dmv->flags); 740 tbl = dm_table_get_entry(&dmv->table_head, DM_TABLE_INACTIVE); 741 742 aprint_debug("dmv->name = %s\n", dmv->name); 743 744 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_MINOR, dmv->minor); 745 746 while ((target_dict = prop_object_iterator_next(iter)) != NULL) { 747 prop_dictionary_get_cstring_nocopy(target_dict, 748 DM_TABLE_TYPE, &type); 749 /* 750 * If we want to deny table with 2 or more different 751 * target we should do it here 752 */ 753 if (((target = dm_target_lookup(type)) == NULL) && 754 ((target = dm_target_autoload(type)) == NULL)) { 755 dm_table_release(&dmv->table_head, DM_TABLE_INACTIVE); 756 dm_dev_unbusy(dmv); 757 return ENOENT; 758 } 759 if ((table_en = kmalloc(sizeof(dm_table_entry_t), 760 M_DM, M_WAITOK)) == NULL) { 761 dm_table_release(&dmv->table_head, DM_TABLE_INACTIVE); 762 dm_dev_unbusy(dmv); 763 return ENOMEM; 764 } 765 prop_dictionary_get_uint64(target_dict, DM_TABLE_START, 766 &table_en->start); 767 prop_dictionary_get_uint64(target_dict, DM_TABLE_LENGTH, 768 &table_en->length); 769 770 aprint_debug("dm_ioctl.c... table_en->start = %ju, " 771 "table_en->length = %ju\n", 772 (uintmax_t)table_en->start, 773 (uintmax_t)table_en->length); 774 775 table_en->target = target; 776 table_en->dm_dev = dmv; 777 table_en->target_config = NULL; 778 779 /* 780 * There is a parameter string after dm_target_spec 781 * structure which points to /dev/wd0a 284 part of 782 * table. String str points to this text. This can be 783 * null and therefore it should be checked before we try to 784 * use it. 785 */ 786 prop_dictionary_get_cstring(target_dict, 787 DM_TABLE_PARAMS, (char **) &str); 788 789 if (SLIST_EMPTY(tbl)) 790 /* insert this table to head */ 791 SLIST_INSERT_HEAD(tbl, table_en, next); 792 else 793 SLIST_INSERT_AFTER(last_table, table_en, next); 794 795 /* 796 * Params string is different for every target, 797 * therfore I have to pass it to target init 798 * routine and parse parameters there. 799 */ 800 aprint_debug("DM: str passed in is: %s", str); 801 if ((ret = target->init(dmv, &table_en->target_config, 802 str)) != 0) { 803 804 dm_table_release(&dmv->table_head, DM_TABLE_INACTIVE); 805 dm_table_destroy(&dmv->table_head, DM_TABLE_INACTIVE); 806 kfree(str, M_TEMP); 807 808 dm_dev_unbusy(dmv); 809 return ret; 810 } 811 last_table = table_en; 812 kfree(str, M_TEMP); 813 } 814 prop_object_iterator_release(iter); 815 816 DM_ADD_FLAG(flags, DM_INACTIVE_PRESENT_FLAG); 817 atomic_set_int(&dmv->flags, DM_INACTIVE_PRESENT_FLAG); 818 819 dm_table_release(&dmv->table_head, DM_TABLE_INACTIVE); 820 821 dm_dev_unbusy(dmv); 822 #if 0 823 dmsetdiskinfo(dmv->diskp, &dmv->table_head); 824 #endif 825 return 0; 826 } 827 /* 828 * Get description of all tables loaded to device from kernel 829 * and send it to libdevmapper. 830 * 831 * Output dictionary for every table: 832 * 833 * <key>cmd_data</key> 834 * <array> 835 * <dict> 836 * <key>type<key> 837 * <string>...</string> 838 * 839 * <key>start</key> 840 * <integer>...</integer> 841 * 842 * <key>length</key> 843 * <integer>...</integer> 844 * 845 * <key>params</key> 846 * <string>...</string> 847 * </dict> 848 * </array> 849 * 850 */ 851 int 852 dm_table_status_ioctl(prop_dictionary_t dm_dict) 853 { 854 dm_dev_t *dmv; 855 dm_table_t *tbl; 856 dm_table_entry_t *table_en; 857 858 prop_array_t cmd_array; 859 prop_dictionary_t target_dict; 860 861 uint32_t rec_size, minor; 862 863 const char *name, *uuid; 864 char *params; 865 int flags; 866 int table_type; 867 868 dmv = NULL; 869 uuid = NULL; 870 name = NULL; 871 params = NULL; 872 flags = 0; 873 rec_size = 0; 874 875 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_NAME, &name); 876 prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_UUID, &uuid); 877 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags); 878 prop_dictionary_get_uint32(dm_dict, DM_IOCTL_MINOR, &minor); 879 880 cmd_array = prop_array_create(); 881 882 if ((dmv = dm_dev_lookup(name, uuid, minor)) == NULL) { 883 DM_REMOVE_FLAG(flags, DM_EXISTS_FLAG); 884 return ENOENT; 885 } 886 /* 887 * if DM_QUERY_INACTIVE_TABLE_FLAG is passed we need to query 888 * INACTIVE TABLE 889 */ 890 if (flags & DM_QUERY_INACTIVE_TABLE_FLAG) 891 table_type = DM_TABLE_INACTIVE; 892 else 893 table_type = DM_TABLE_ACTIVE; 894 895 if (dm_table_get_target_count(&dmv->table_head, DM_TABLE_ACTIVE)) 896 DM_ADD_FLAG(flags, DM_ACTIVE_PRESENT_FLAG); 897 else { 898 DM_REMOVE_FLAG(flags, DM_ACTIVE_PRESENT_FLAG); 899 900 if (dm_table_get_target_count(&dmv->table_head, DM_TABLE_INACTIVE)) 901 DM_ADD_FLAG(flags, DM_INACTIVE_PRESENT_FLAG); 902 else { 903 DM_REMOVE_FLAG(flags, DM_INACTIVE_PRESENT_FLAG); 904 } 905 } 906 907 if (dmv->flags & DM_SUSPEND_FLAG) 908 DM_ADD_FLAG(flags, DM_SUSPEND_FLAG); 909 910 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_MINOR, dmv->minor); 911 912 aprint_debug("Status of device tables: %s--%d\n", 913 name, dmv->table_head.cur_active_table); 914 915 tbl = dm_table_get_entry(&dmv->table_head, table_type); 916 917 SLIST_FOREACH(table_en, tbl, next) { 918 target_dict = prop_dictionary_create(); 919 aprint_debug("%016" PRIu64 ", length %016" PRIu64 920 ", target %s\n", table_en->start, table_en->length, 921 table_en->target->name); 922 923 prop_dictionary_set_uint64(target_dict, DM_TABLE_START, 924 table_en->start); 925 prop_dictionary_set_uint64(target_dict, DM_TABLE_LENGTH, 926 table_en->length); 927 928 prop_dictionary_set_cstring(target_dict, DM_TABLE_TYPE, 929 table_en->target->name); 930 931 /* dm_table_get_cur_actv.table ?? */ 932 prop_dictionary_set_int32(target_dict, DM_TABLE_STAT, 933 dmv->table_head.cur_active_table); 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 kfree(params, M_DM); 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 /* 962 * For every call I have to set kernel driver version. 963 * Because I can have commands supported only in other 964 * newer/later version. This routine is called for every 965 * ioctl command. 966 */ 967 int 968 dm_check_version(prop_dictionary_t dm_dict) 969 { 970 size_t i; 971 int dm_version[3]; 972 prop_array_t ver; 973 974 ver = prop_dictionary_get(dm_dict, DM_IOCTL_VERSION); 975 976 for (i = 0; i < 3; i++) 977 prop_array_get_uint32(ver, i, &dm_version[i]); 978 979 if (DM_VERSION_MAJOR != dm_version[0] || DM_VERSION_MINOR < dm_version[1]) { 980 aprint_debug("libdevmapper/kernel version mismatch " 981 "kernel: %d.%d.%d libdevmapper: %d.%d.%d\n", 982 DM_VERSION_MAJOR, DM_VERSION_MINOR, DM_VERSION_PATCHLEVEL, 983 dm_version[0], dm_version[1], dm_version[2]); 984 985 return EIO; 986 } 987 prop_array_set_uint32(ver, 0, DM_VERSION_MAJOR); 988 prop_array_set_uint32(ver, 1, DM_VERSION_MINOR); 989 prop_array_set_uint32(ver, 2, DM_VERSION_PATCHLEVEL); 990 991 prop_dictionary_set(dm_dict, DM_IOCTL_VERSION, ver); 992 993 return 0; 994 } 995