1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright 2015 Nexenta Systems, Inc. All rights reserved. 24 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 25 * Copyright (c) 2013 by Delphix. All rights reserved. 26 * Copyright 2015 RackTop Systems. 27 */ 28 29 /* 30 * Pool import support functions. 31 * 32 * To import a pool, we rely on reading the configuration information from the 33 * ZFS label of each device. If we successfully read the label, then we 34 * organize the configuration information in the following hierarchy: 35 * 36 * pool guid -> toplevel vdev guid -> label txg 37 * 38 * Duplicate entries matching this same tuple will be discarded. Once we have 39 * examined every device, we pick the best label txg config for each toplevel 40 * vdev. We then arrange these toplevel vdevs into a complete pool config, and 41 * update any paths that have changed. Finally, we attempt to import the pool 42 * using our derived config, and record the results. 43 */ 44 45 #include <ctype.h> 46 #include <devid.h> 47 #include <dirent.h> 48 #include <errno.h> 49 #include <libintl.h> 50 #include <stddef.h> 51 #include <stdlib.h> 52 #include <string.h> 53 #include <sys/stat.h> 54 #include <unistd.h> 55 #include <fcntl.h> 56 #include <sys/vtoc.h> 57 #include <sys/dktp/fdisk.h> 58 #include <sys/efi_partition.h> 59 #include <thread_pool.h> 60 61 #include <sys/vdev_impl.h> 62 63 #include "libzfs.h" 64 #include "libzfs_impl.h" 65 66 /* 67 * Intermediate structures used to gather configuration information. 68 */ 69 typedef struct config_entry { 70 uint64_t ce_txg; 71 nvlist_t *ce_config; 72 struct config_entry *ce_next; 73 } config_entry_t; 74 75 typedef struct vdev_entry { 76 uint64_t ve_guid; 77 config_entry_t *ve_configs; 78 struct vdev_entry *ve_next; 79 } vdev_entry_t; 80 81 typedef struct pool_entry { 82 uint64_t pe_guid; 83 vdev_entry_t *pe_vdevs; 84 struct pool_entry *pe_next; 85 } pool_entry_t; 86 87 typedef struct name_entry { 88 char *ne_name; 89 uint64_t ne_guid; 90 struct name_entry *ne_next; 91 } name_entry_t; 92 93 typedef struct pool_list { 94 pool_entry_t *pools; 95 name_entry_t *names; 96 } pool_list_t; 97 98 static char * 99 get_devid(const char *path) 100 { 101 int fd; 102 ddi_devid_t devid; 103 char *minor, *ret; 104 105 if ((fd = open(path, O_RDONLY)) < 0) 106 return (NULL); 107 108 minor = NULL; 109 ret = NULL; 110 if (devid_get(fd, &devid) == 0) { 111 if (devid_get_minor_name(fd, &minor) == 0) 112 ret = devid_str_encode(devid, minor); 113 if (minor != NULL) 114 devid_str_free(minor); 115 devid_free(devid); 116 } 117 (void) close(fd); 118 119 return (ret); 120 } 121 122 123 /* 124 * Go through and fix up any path and/or devid information for the given vdev 125 * configuration. 126 */ 127 static int 128 fix_paths(nvlist_t *nv, name_entry_t *names) 129 { 130 nvlist_t **child; 131 uint_t c, children; 132 uint64_t guid; 133 name_entry_t *ne, *best; 134 char *path, *devid; 135 int matched; 136 137 if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_CHILDREN, 138 &child, &children) == 0) { 139 for (c = 0; c < children; c++) 140 if (fix_paths(child[c], names) != 0) 141 return (-1); 142 return (0); 143 } 144 145 /* 146 * This is a leaf (file or disk) vdev. In either case, go through 147 * the name list and see if we find a matching guid. If so, replace 148 * the path and see if we can calculate a new devid. 149 * 150 * There may be multiple names associated with a particular guid, in 151 * which case we have overlapping slices or multiple paths to the same 152 * disk. If this is the case, then we want to pick the path that is 153 * the most similar to the original, where "most similar" is the number 154 * of matching characters starting from the end of the path. This will 155 * preserve slice numbers even if the disks have been reorganized, and 156 * will also catch preferred disk names if multiple paths exist. 157 */ 158 verify(nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID, &guid) == 0); 159 if (nvlist_lookup_string(nv, ZPOOL_CONFIG_PATH, &path) != 0) 160 path = NULL; 161 162 matched = 0; 163 best = NULL; 164 for (ne = names; ne != NULL; ne = ne->ne_next) { 165 if (ne->ne_guid == guid) { 166 const char *src, *dst; 167 int count; 168 169 if (path == NULL) { 170 best = ne; 171 break; 172 } 173 174 src = ne->ne_name + strlen(ne->ne_name) - 1; 175 dst = path + strlen(path) - 1; 176 for (count = 0; src >= ne->ne_name && dst >= path; 177 src--, dst--, count++) 178 if (*src != *dst) 179 break; 180 181 /* 182 * At this point, 'count' is the number of characters 183 * matched from the end. 184 */ 185 if (count > matched || best == NULL) { 186 best = ne; 187 matched = count; 188 } 189 } 190 } 191 192 if (best == NULL) 193 return (0); 194 195 if (nvlist_add_string(nv, ZPOOL_CONFIG_PATH, best->ne_name) != 0) 196 return (-1); 197 198 if ((devid = get_devid(best->ne_name)) == NULL) { 199 (void) nvlist_remove_all(nv, ZPOOL_CONFIG_DEVID); 200 } else { 201 if (nvlist_add_string(nv, ZPOOL_CONFIG_DEVID, devid) != 0) { 202 devid_str_free(devid); 203 return (-1); 204 } 205 devid_str_free(devid); 206 } 207 208 return (0); 209 } 210 211 /* 212 * Add the given configuration to the list of known devices. 213 */ 214 static int 215 add_config(libzfs_handle_t *hdl, pool_list_t *pl, const char *path, 216 nvlist_t *config) 217 { 218 uint64_t pool_guid, vdev_guid, top_guid, txg, state; 219 pool_entry_t *pe; 220 vdev_entry_t *ve; 221 config_entry_t *ce; 222 name_entry_t *ne; 223 224 /* 225 * If this is a hot spare not currently in use or level 2 cache 226 * device, add it to the list of names to translate, but don't do 227 * anything else. 228 */ 229 if (nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_STATE, 230 &state) == 0 && 231 (state == POOL_STATE_SPARE || state == POOL_STATE_L2CACHE) && 232 nvlist_lookup_uint64(config, ZPOOL_CONFIG_GUID, &vdev_guid) == 0) { 233 if ((ne = zfs_alloc(hdl, sizeof (name_entry_t))) == NULL) 234 return (-1); 235 236 if ((ne->ne_name = zfs_strdup(hdl, path)) == NULL) { 237 free(ne); 238 return (-1); 239 } 240 ne->ne_guid = vdev_guid; 241 ne->ne_next = pl->names; 242 pl->names = ne; 243 nvlist_free(config); 244 return (0); 245 } 246 247 /* 248 * If we have a valid config but cannot read any of these fields, then 249 * it means we have a half-initialized label. In vdev_label_init() 250 * we write a label with txg == 0 so that we can identify the device 251 * in case the user refers to the same disk later on. If we fail to 252 * create the pool, we'll be left with a label in this state 253 * which should not be considered part of a valid pool. 254 */ 255 if (nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_GUID, 256 &pool_guid) != 0 || 257 nvlist_lookup_uint64(config, ZPOOL_CONFIG_GUID, 258 &vdev_guid) != 0 || 259 nvlist_lookup_uint64(config, ZPOOL_CONFIG_TOP_GUID, 260 &top_guid) != 0 || 261 nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_TXG, 262 &txg) != 0 || txg == 0) { 263 nvlist_free(config); 264 return (0); 265 } 266 267 /* 268 * First, see if we know about this pool. If not, then add it to the 269 * list of known pools. 270 */ 271 for (pe = pl->pools; pe != NULL; pe = pe->pe_next) { 272 if (pe->pe_guid == pool_guid) 273 break; 274 } 275 276 if (pe == NULL) { 277 if ((pe = zfs_alloc(hdl, sizeof (pool_entry_t))) == NULL) 278 return (-1); 279 pe->pe_guid = pool_guid; 280 pe->pe_next = pl->pools; 281 pl->pools = pe; 282 } 283 284 /* 285 * Second, see if we know about this toplevel vdev. Add it if its 286 * missing. 287 */ 288 for (ve = pe->pe_vdevs; ve != NULL; ve = ve->ve_next) { 289 if (ve->ve_guid == top_guid) 290 break; 291 } 292 293 if (ve == NULL) { 294 if ((ve = zfs_alloc(hdl, sizeof (vdev_entry_t))) == NULL) 295 return (-1); 296 ve->ve_guid = top_guid; 297 ve->ve_next = pe->pe_vdevs; 298 pe->pe_vdevs = ve; 299 } 300 301 /* 302 * Third, add the vdev guid -> path mappings so that we can fix up 303 * the configuration as necessary before doing the import. 304 */ 305 if ((ne = zfs_alloc(hdl, sizeof (name_entry_t))) == NULL) 306 return (-1); 307 308 if ((ne->ne_name = zfs_strdup(hdl, path)) == NULL) { 309 free(ne); 310 return (-1); 311 } 312 313 ne->ne_guid = vdev_guid; 314 ne->ne_next = pl->names; 315 pl->names = ne; 316 317 /* 318 * Finally, see if we have a config with a matching transaction 319 * group. If so, then we do nothing. Otherwise, add it to the list 320 * of known configs. 321 */ 322 for (ce = ve->ve_configs; ce != NULL; ce = ce->ce_next) { 323 if (ce->ce_txg == txg) 324 break; 325 } 326 327 if (ce == NULL) { 328 if ((ce = zfs_alloc(hdl, sizeof (config_entry_t))) == NULL) 329 return (-1); 330 ce->ce_txg = txg; 331 ce->ce_config = config; 332 ce->ce_next = ve->ve_configs; 333 ve->ve_configs = ce; 334 } else { 335 nvlist_free(config); 336 } 337 338 return (0); 339 } 340 341 /* 342 * Returns true if the named pool matches the given GUID. 343 */ 344 static int 345 pool_active(libzfs_handle_t *hdl, const char *name, uint64_t guid, 346 boolean_t *isactive) 347 { 348 zpool_handle_t *zhp; 349 uint64_t theguid; 350 351 if (zpool_open_silent(hdl, name, &zhp) != 0) 352 return (-1); 353 354 if (zhp == NULL) { 355 *isactive = B_FALSE; 356 return (0); 357 } 358 359 verify(nvlist_lookup_uint64(zhp->zpool_config, ZPOOL_CONFIG_POOL_GUID, 360 &theguid) == 0); 361 362 zpool_close(zhp); 363 364 *isactive = (theguid == guid); 365 return (0); 366 } 367 368 static nvlist_t * 369 refresh_config(libzfs_handle_t *hdl, nvlist_t *config) 370 { 371 nvlist_t *nvl; 372 zfs_cmd_t zc = { 0 }; 373 int err; 374 375 if (zcmd_write_conf_nvlist(hdl, &zc, config) != 0) 376 return (NULL); 377 378 if (zcmd_alloc_dst_nvlist(hdl, &zc, 379 zc.zc_nvlist_conf_size * 2) != 0) { 380 zcmd_free_nvlists(&zc); 381 return (NULL); 382 } 383 384 while ((err = ioctl(hdl->libzfs_fd, ZFS_IOC_POOL_TRYIMPORT, 385 &zc)) != 0 && errno == ENOMEM) { 386 if (zcmd_expand_dst_nvlist(hdl, &zc) != 0) { 387 zcmd_free_nvlists(&zc); 388 return (NULL); 389 } 390 } 391 392 if (err) { 393 zcmd_free_nvlists(&zc); 394 return (NULL); 395 } 396 397 if (zcmd_read_dst_nvlist(hdl, &zc, &nvl) != 0) { 398 zcmd_free_nvlists(&zc); 399 return (NULL); 400 } 401 402 zcmd_free_nvlists(&zc); 403 return (nvl); 404 } 405 406 /* 407 * Determine if the vdev id is a hole in the namespace. 408 */ 409 boolean_t 410 vdev_is_hole(uint64_t *hole_array, uint_t holes, uint_t id) 411 { 412 for (int c = 0; c < holes; c++) { 413 414 /* Top-level is a hole */ 415 if (hole_array[c] == id) 416 return (B_TRUE); 417 } 418 return (B_FALSE); 419 } 420 421 /* 422 * Convert our list of pools into the definitive set of configurations. We 423 * start by picking the best config for each toplevel vdev. Once that's done, 424 * we assemble the toplevel vdevs into a full config for the pool. We make a 425 * pass to fix up any incorrect paths, and then add it to the main list to 426 * return to the user. 427 */ 428 static nvlist_t * 429 get_configs(libzfs_handle_t *hdl, pool_list_t *pl, boolean_t active_ok) 430 { 431 pool_entry_t *pe; 432 vdev_entry_t *ve; 433 config_entry_t *ce; 434 nvlist_t *ret = NULL, *config = NULL, *tmp, *nvtop, *nvroot; 435 nvlist_t **spares, **l2cache; 436 uint_t i, nspares, nl2cache; 437 boolean_t config_seen; 438 uint64_t best_txg; 439 char *name, *hostname; 440 uint64_t guid; 441 uint_t children = 0; 442 nvlist_t **child = NULL; 443 uint_t holes; 444 uint64_t *hole_array, max_id; 445 uint_t c; 446 boolean_t isactive; 447 uint64_t hostid; 448 nvlist_t *nvl; 449 boolean_t found_one = B_FALSE; 450 boolean_t valid_top_config = B_FALSE; 451 452 if (nvlist_alloc(&ret, 0, 0) != 0) 453 goto nomem; 454 455 for (pe = pl->pools; pe != NULL; pe = pe->pe_next) { 456 uint64_t id, max_txg = 0; 457 458 if (nvlist_alloc(&config, NV_UNIQUE_NAME, 0) != 0) 459 goto nomem; 460 config_seen = B_FALSE; 461 462 /* 463 * Iterate over all toplevel vdevs. Grab the pool configuration 464 * from the first one we find, and then go through the rest and 465 * add them as necessary to the 'vdevs' member of the config. 466 */ 467 for (ve = pe->pe_vdevs; ve != NULL; ve = ve->ve_next) { 468 469 /* 470 * Determine the best configuration for this vdev by 471 * selecting the config with the latest transaction 472 * group. 473 */ 474 best_txg = 0; 475 for (ce = ve->ve_configs; ce != NULL; 476 ce = ce->ce_next) { 477 478 if (ce->ce_txg > best_txg) { 479 tmp = ce->ce_config; 480 best_txg = ce->ce_txg; 481 } 482 } 483 484 /* 485 * We rely on the fact that the max txg for the 486 * pool will contain the most up-to-date information 487 * about the valid top-levels in the vdev namespace. 488 */ 489 if (best_txg > max_txg) { 490 (void) nvlist_remove(config, 491 ZPOOL_CONFIG_VDEV_CHILDREN, 492 DATA_TYPE_UINT64); 493 (void) nvlist_remove(config, 494 ZPOOL_CONFIG_HOLE_ARRAY, 495 DATA_TYPE_UINT64_ARRAY); 496 497 max_txg = best_txg; 498 hole_array = NULL; 499 holes = 0; 500 max_id = 0; 501 valid_top_config = B_FALSE; 502 503 if (nvlist_lookup_uint64(tmp, 504 ZPOOL_CONFIG_VDEV_CHILDREN, &max_id) == 0) { 505 verify(nvlist_add_uint64(config, 506 ZPOOL_CONFIG_VDEV_CHILDREN, 507 max_id) == 0); 508 valid_top_config = B_TRUE; 509 } 510 511 if (nvlist_lookup_uint64_array(tmp, 512 ZPOOL_CONFIG_HOLE_ARRAY, &hole_array, 513 &holes) == 0) { 514 verify(nvlist_add_uint64_array(config, 515 ZPOOL_CONFIG_HOLE_ARRAY, 516 hole_array, holes) == 0); 517 } 518 } 519 520 if (!config_seen) { 521 /* 522 * Copy the relevant pieces of data to the pool 523 * configuration: 524 * 525 * version 526 * pool guid 527 * name 528 * comment (if available) 529 * pool state 530 * hostid (if available) 531 * hostname (if available) 532 */ 533 uint64_t state, version; 534 char *comment = NULL; 535 536 version = fnvlist_lookup_uint64(tmp, 537 ZPOOL_CONFIG_VERSION); 538 fnvlist_add_uint64(config, 539 ZPOOL_CONFIG_VERSION, version); 540 guid = fnvlist_lookup_uint64(tmp, 541 ZPOOL_CONFIG_POOL_GUID); 542 fnvlist_add_uint64(config, 543 ZPOOL_CONFIG_POOL_GUID, guid); 544 name = fnvlist_lookup_string(tmp, 545 ZPOOL_CONFIG_POOL_NAME); 546 fnvlist_add_string(config, 547 ZPOOL_CONFIG_POOL_NAME, name); 548 549 if (nvlist_lookup_string(tmp, 550 ZPOOL_CONFIG_COMMENT, &comment) == 0) 551 fnvlist_add_string(config, 552 ZPOOL_CONFIG_COMMENT, comment); 553 554 state = fnvlist_lookup_uint64(tmp, 555 ZPOOL_CONFIG_POOL_STATE); 556 fnvlist_add_uint64(config, 557 ZPOOL_CONFIG_POOL_STATE, state); 558 559 hostid = 0; 560 if (nvlist_lookup_uint64(tmp, 561 ZPOOL_CONFIG_HOSTID, &hostid) == 0) { 562 fnvlist_add_uint64(config, 563 ZPOOL_CONFIG_HOSTID, hostid); 564 hostname = fnvlist_lookup_string(tmp, 565 ZPOOL_CONFIG_HOSTNAME); 566 fnvlist_add_string(config, 567 ZPOOL_CONFIG_HOSTNAME, hostname); 568 } 569 570 config_seen = B_TRUE; 571 } 572 573 /* 574 * Add this top-level vdev to the child array. 575 */ 576 verify(nvlist_lookup_nvlist(tmp, 577 ZPOOL_CONFIG_VDEV_TREE, &nvtop) == 0); 578 verify(nvlist_lookup_uint64(nvtop, ZPOOL_CONFIG_ID, 579 &id) == 0); 580 581 if (id >= children) { 582 nvlist_t **newchild; 583 584 newchild = zfs_alloc(hdl, (id + 1) * 585 sizeof (nvlist_t *)); 586 if (newchild == NULL) 587 goto nomem; 588 589 for (c = 0; c < children; c++) 590 newchild[c] = child[c]; 591 592 free(child); 593 child = newchild; 594 children = id + 1; 595 } 596 if (nvlist_dup(nvtop, &child[id], 0) != 0) 597 goto nomem; 598 599 } 600 601 /* 602 * If we have information about all the top-levels then 603 * clean up the nvlist which we've constructed. This 604 * means removing any extraneous devices that are 605 * beyond the valid range or adding devices to the end 606 * of our array which appear to be missing. 607 */ 608 if (valid_top_config) { 609 if (max_id < children) { 610 for (c = max_id; c < children; c++) 611 nvlist_free(child[c]); 612 children = max_id; 613 } else if (max_id > children) { 614 nvlist_t **newchild; 615 616 newchild = zfs_alloc(hdl, (max_id) * 617 sizeof (nvlist_t *)); 618 if (newchild == NULL) 619 goto nomem; 620 621 for (c = 0; c < children; c++) 622 newchild[c] = child[c]; 623 624 free(child); 625 child = newchild; 626 children = max_id; 627 } 628 } 629 630 verify(nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_GUID, 631 &guid) == 0); 632 633 /* 634 * The vdev namespace may contain holes as a result of 635 * device removal. We must add them back into the vdev 636 * tree before we process any missing devices. 637 */ 638 if (holes > 0) { 639 ASSERT(valid_top_config); 640 641 for (c = 0; c < children; c++) { 642 nvlist_t *holey; 643 644 if (child[c] != NULL || 645 !vdev_is_hole(hole_array, holes, c)) 646 continue; 647 648 if (nvlist_alloc(&holey, NV_UNIQUE_NAME, 649 0) != 0) 650 goto nomem; 651 652 /* 653 * Holes in the namespace are treated as 654 * "hole" top-level vdevs and have a 655 * special flag set on them. 656 */ 657 if (nvlist_add_string(holey, 658 ZPOOL_CONFIG_TYPE, 659 VDEV_TYPE_HOLE) != 0 || 660 nvlist_add_uint64(holey, 661 ZPOOL_CONFIG_ID, c) != 0 || 662 nvlist_add_uint64(holey, 663 ZPOOL_CONFIG_GUID, 0ULL) != 0) { 664 nvlist_free(holey); 665 goto nomem; 666 } 667 child[c] = holey; 668 } 669 } 670 671 /* 672 * Look for any missing top-level vdevs. If this is the case, 673 * create a faked up 'missing' vdev as a placeholder. We cannot 674 * simply compress the child array, because the kernel performs 675 * certain checks to make sure the vdev IDs match their location 676 * in the configuration. 677 */ 678 for (c = 0; c < children; c++) { 679 if (child[c] == NULL) { 680 nvlist_t *missing; 681 if (nvlist_alloc(&missing, NV_UNIQUE_NAME, 682 0) != 0) 683 goto nomem; 684 if (nvlist_add_string(missing, 685 ZPOOL_CONFIG_TYPE, 686 VDEV_TYPE_MISSING) != 0 || 687 nvlist_add_uint64(missing, 688 ZPOOL_CONFIG_ID, c) != 0 || 689 nvlist_add_uint64(missing, 690 ZPOOL_CONFIG_GUID, 0ULL) != 0) { 691 nvlist_free(missing); 692 goto nomem; 693 } 694 child[c] = missing; 695 } 696 } 697 698 /* 699 * Put all of this pool's top-level vdevs into a root vdev. 700 */ 701 if (nvlist_alloc(&nvroot, NV_UNIQUE_NAME, 0) != 0) 702 goto nomem; 703 if (nvlist_add_string(nvroot, ZPOOL_CONFIG_TYPE, 704 VDEV_TYPE_ROOT) != 0 || 705 nvlist_add_uint64(nvroot, ZPOOL_CONFIG_ID, 0ULL) != 0 || 706 nvlist_add_uint64(nvroot, ZPOOL_CONFIG_GUID, guid) != 0 || 707 nvlist_add_nvlist_array(nvroot, ZPOOL_CONFIG_CHILDREN, 708 child, children) != 0) { 709 nvlist_free(nvroot); 710 goto nomem; 711 } 712 713 for (c = 0; c < children; c++) 714 nvlist_free(child[c]); 715 free(child); 716 children = 0; 717 child = NULL; 718 719 /* 720 * Go through and fix up any paths and/or devids based on our 721 * known list of vdev GUID -> path mappings. 722 */ 723 if (fix_paths(nvroot, pl->names) != 0) { 724 nvlist_free(nvroot); 725 goto nomem; 726 } 727 728 /* 729 * Add the root vdev to this pool's configuration. 730 */ 731 if (nvlist_add_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, 732 nvroot) != 0) { 733 nvlist_free(nvroot); 734 goto nomem; 735 } 736 nvlist_free(nvroot); 737 738 /* 739 * zdb uses this path to report on active pools that were 740 * imported or created using -R. 741 */ 742 if (active_ok) 743 goto add_pool; 744 745 /* 746 * Determine if this pool is currently active, in which case we 747 * can't actually import it. 748 */ 749 verify(nvlist_lookup_string(config, ZPOOL_CONFIG_POOL_NAME, 750 &name) == 0); 751 verify(nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_GUID, 752 &guid) == 0); 753 754 if (pool_active(hdl, name, guid, &isactive) != 0) 755 goto error; 756 757 if (isactive) { 758 nvlist_free(config); 759 config = NULL; 760 continue; 761 } 762 763 if ((nvl = refresh_config(hdl, config)) == NULL) { 764 nvlist_free(config); 765 config = NULL; 766 continue; 767 } 768 769 nvlist_free(config); 770 config = nvl; 771 772 /* 773 * Go through and update the paths for spares, now that we have 774 * them. 775 */ 776 verify(nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, 777 &nvroot) == 0); 778 if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_SPARES, 779 &spares, &nspares) == 0) { 780 for (i = 0; i < nspares; i++) { 781 if (fix_paths(spares[i], pl->names) != 0) 782 goto nomem; 783 } 784 } 785 786 /* 787 * Update the paths for l2cache devices. 788 */ 789 if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_L2CACHE, 790 &l2cache, &nl2cache) == 0) { 791 for (i = 0; i < nl2cache; i++) { 792 if (fix_paths(l2cache[i], pl->names) != 0) 793 goto nomem; 794 } 795 } 796 797 /* 798 * Restore the original information read from the actual label. 799 */ 800 (void) nvlist_remove(config, ZPOOL_CONFIG_HOSTID, 801 DATA_TYPE_UINT64); 802 (void) nvlist_remove(config, ZPOOL_CONFIG_HOSTNAME, 803 DATA_TYPE_STRING); 804 if (hostid != 0) { 805 verify(nvlist_add_uint64(config, ZPOOL_CONFIG_HOSTID, 806 hostid) == 0); 807 verify(nvlist_add_string(config, ZPOOL_CONFIG_HOSTNAME, 808 hostname) == 0); 809 } 810 811 add_pool: 812 /* 813 * Add this pool to the list of configs. 814 */ 815 verify(nvlist_lookup_string(config, ZPOOL_CONFIG_POOL_NAME, 816 &name) == 0); 817 if (nvlist_add_nvlist(ret, name, config) != 0) 818 goto nomem; 819 820 found_one = B_TRUE; 821 nvlist_free(config); 822 config = NULL; 823 } 824 825 if (!found_one) { 826 nvlist_free(ret); 827 ret = NULL; 828 } 829 830 return (ret); 831 832 nomem: 833 (void) no_memory(hdl); 834 error: 835 nvlist_free(config); 836 nvlist_free(ret); 837 for (c = 0; c < children; c++) 838 nvlist_free(child[c]); 839 free(child); 840 841 return (NULL); 842 } 843 844 /* 845 * Return the offset of the given label. 846 */ 847 static uint64_t 848 label_offset(uint64_t size, int l) 849 { 850 ASSERT(P2PHASE_TYPED(size, sizeof (vdev_label_t), uint64_t) == 0); 851 return (l * sizeof (vdev_label_t) + (l < VDEV_LABELS / 2 ? 852 0 : size - VDEV_LABELS * sizeof (vdev_label_t))); 853 } 854 855 /* 856 * Given a file descriptor, read the label information and return an nvlist 857 * describing the configuration, if there is one. 858 */ 859 int 860 zpool_read_label(int fd, nvlist_t **config) 861 { 862 struct stat64 statbuf; 863 int l; 864 vdev_label_t *label; 865 uint64_t state, txg, size; 866 867 *config = NULL; 868 869 if (fstat64(fd, &statbuf) == -1) 870 return (0); 871 size = P2ALIGN_TYPED(statbuf.st_size, sizeof (vdev_label_t), uint64_t); 872 873 if ((label = malloc(sizeof (vdev_label_t))) == NULL) 874 return (-1); 875 876 for (l = 0; l < VDEV_LABELS; l++) { 877 if (pread64(fd, label, sizeof (vdev_label_t), 878 label_offset(size, l)) != sizeof (vdev_label_t)) 879 continue; 880 881 if (nvlist_unpack(label->vl_vdev_phys.vp_nvlist, 882 sizeof (label->vl_vdev_phys.vp_nvlist), config, 0) != 0) 883 continue; 884 885 if (nvlist_lookup_uint64(*config, ZPOOL_CONFIG_POOL_STATE, 886 &state) != 0 || state > POOL_STATE_L2CACHE) { 887 nvlist_free(*config); 888 continue; 889 } 890 891 if (state != POOL_STATE_SPARE && state != POOL_STATE_L2CACHE && 892 (nvlist_lookup_uint64(*config, ZPOOL_CONFIG_POOL_TXG, 893 &txg) != 0 || txg == 0)) { 894 nvlist_free(*config); 895 continue; 896 } 897 898 free(label); 899 return (0); 900 } 901 902 free(label); 903 *config = NULL; 904 return (0); 905 } 906 907 typedef struct rdsk_node { 908 char *rn_name; 909 int rn_dfd; 910 libzfs_handle_t *rn_hdl; 911 nvlist_t *rn_config; 912 avl_tree_t *rn_avl; 913 avl_node_t rn_node; 914 boolean_t rn_nozpool; 915 } rdsk_node_t; 916 917 static int 918 slice_cache_compare(const void *arg1, const void *arg2) 919 { 920 const char *nm1 = ((rdsk_node_t *)arg1)->rn_name; 921 const char *nm2 = ((rdsk_node_t *)arg2)->rn_name; 922 char *nm1slice, *nm2slice; 923 int rv; 924 925 /* 926 * slices zero and two are the most likely to provide results, 927 * so put those first 928 */ 929 nm1slice = strstr(nm1, "s0"); 930 nm2slice = strstr(nm2, "s0"); 931 if (nm1slice && !nm2slice) { 932 return (-1); 933 } 934 if (!nm1slice && nm2slice) { 935 return (1); 936 } 937 nm1slice = strstr(nm1, "s2"); 938 nm2slice = strstr(nm2, "s2"); 939 if (nm1slice && !nm2slice) { 940 return (-1); 941 } 942 if (!nm1slice && nm2slice) { 943 return (1); 944 } 945 946 rv = strcmp(nm1, nm2); 947 if (rv == 0) 948 return (0); 949 return (rv > 0 ? 1 : -1); 950 } 951 952 static void 953 check_one_slice(avl_tree_t *r, char *diskname, uint_t partno, 954 diskaddr_t size, uint_t blksz) 955 { 956 rdsk_node_t tmpnode; 957 rdsk_node_t *node; 958 char sname[MAXNAMELEN]; 959 960 tmpnode.rn_name = &sname[0]; 961 (void) snprintf(tmpnode.rn_name, MAXNAMELEN, "%s%u", 962 diskname, partno); 963 /* 964 * protect against division by zero for disk labels that 965 * contain a bogus sector size 966 */ 967 if (blksz == 0) 968 blksz = DEV_BSIZE; 969 /* too small to contain a zpool? */ 970 if ((size < (SPA_MINDEVSIZE / blksz)) && 971 (node = avl_find(r, &tmpnode, NULL))) 972 node->rn_nozpool = B_TRUE; 973 } 974 975 static void 976 nozpool_all_slices(avl_tree_t *r, const char *sname) 977 { 978 char diskname[MAXNAMELEN]; 979 char *ptr; 980 int i; 981 982 (void) strncpy(diskname, sname, MAXNAMELEN); 983 if (((ptr = strrchr(diskname, 's')) == NULL) && 984 ((ptr = strrchr(diskname, 'p')) == NULL)) 985 return; 986 ptr[0] = 's'; 987 ptr[1] = '\0'; 988 for (i = 0; i < NDKMAP; i++) 989 check_one_slice(r, diskname, i, 0, 1); 990 ptr[0] = 'p'; 991 for (i = 0; i <= FD_NUMPART; i++) 992 check_one_slice(r, diskname, i, 0, 1); 993 } 994 995 static void 996 check_slices(avl_tree_t *r, int fd, const char *sname) 997 { 998 struct extvtoc vtoc; 999 struct dk_gpt *gpt; 1000 char diskname[MAXNAMELEN]; 1001 char *ptr; 1002 int i; 1003 1004 (void) strncpy(diskname, sname, MAXNAMELEN); 1005 if ((ptr = strrchr(diskname, 's')) == NULL || !isdigit(ptr[1])) 1006 return; 1007 ptr[1] = '\0'; 1008 1009 if (read_extvtoc(fd, &vtoc) >= 0) { 1010 for (i = 0; i < NDKMAP; i++) 1011 check_one_slice(r, diskname, i, 1012 vtoc.v_part[i].p_size, vtoc.v_sectorsz); 1013 } else if (efi_alloc_and_read(fd, &gpt) >= 0) { 1014 /* 1015 * on x86 we'll still have leftover links that point 1016 * to slices s[9-15], so use NDKMAP instead 1017 */ 1018 for (i = 0; i < NDKMAP; i++) 1019 check_one_slice(r, diskname, i, 1020 gpt->efi_parts[i].p_size, gpt->efi_lbasize); 1021 /* nodes p[1-4] are never used with EFI labels */ 1022 ptr[0] = 'p'; 1023 for (i = 1; i <= FD_NUMPART; i++) 1024 check_one_slice(r, diskname, i, 0, 1); 1025 efi_free(gpt); 1026 } 1027 } 1028 1029 static void 1030 zpool_open_func(void *arg) 1031 { 1032 rdsk_node_t *rn = arg; 1033 struct stat64 statbuf; 1034 nvlist_t *config; 1035 int fd; 1036 1037 if (rn->rn_nozpool) 1038 return; 1039 if ((fd = openat64(rn->rn_dfd, rn->rn_name, O_RDONLY)) < 0) { 1040 /* symlink to a device that's no longer there */ 1041 if (errno == ENOENT) 1042 nozpool_all_slices(rn->rn_avl, rn->rn_name); 1043 return; 1044 } 1045 /* 1046 * Ignore failed stats. We only want regular 1047 * files, character devs and block devs. 1048 */ 1049 if (fstat64(fd, &statbuf) != 0 || 1050 (!S_ISREG(statbuf.st_mode) && 1051 !S_ISCHR(statbuf.st_mode) && 1052 !S_ISBLK(statbuf.st_mode))) { 1053 (void) close(fd); 1054 return; 1055 } 1056 /* this file is too small to hold a zpool */ 1057 if (S_ISREG(statbuf.st_mode) && 1058 statbuf.st_size < SPA_MINDEVSIZE) { 1059 (void) close(fd); 1060 return; 1061 } else if (!S_ISREG(statbuf.st_mode)) { 1062 /* 1063 * Try to read the disk label first so we don't have to 1064 * open a bunch of minor nodes that can't have a zpool. 1065 */ 1066 check_slices(rn->rn_avl, fd, rn->rn_name); 1067 } 1068 1069 if ((zpool_read_label(fd, &config)) != 0) { 1070 (void) close(fd); 1071 (void) no_memory(rn->rn_hdl); 1072 return; 1073 } 1074 (void) close(fd); 1075 1076 rn->rn_config = config; 1077 } 1078 1079 /* 1080 * Given a file descriptor, clear (zero) the label information. This function 1081 * is currently only used in the appliance stack as part of the ZFS sysevent 1082 * module. 1083 */ 1084 int 1085 zpool_clear_label(int fd) 1086 { 1087 struct stat64 statbuf; 1088 int l; 1089 vdev_label_t *label; 1090 uint64_t size; 1091 1092 if (fstat64(fd, &statbuf) == -1) 1093 return (0); 1094 size = P2ALIGN_TYPED(statbuf.st_size, sizeof (vdev_label_t), uint64_t); 1095 1096 if ((label = calloc(sizeof (vdev_label_t), 1)) == NULL) 1097 return (-1); 1098 1099 for (l = 0; l < VDEV_LABELS; l++) { 1100 if (pwrite64(fd, label, sizeof (vdev_label_t), 1101 label_offset(size, l)) != sizeof (vdev_label_t)) { 1102 free(label); 1103 return (-1); 1104 } 1105 } 1106 1107 free(label); 1108 return (0); 1109 } 1110 1111 /* 1112 * Given a list of directories to search, find all pools stored on disk. This 1113 * includes partial pools which are not available to import. If no args are 1114 * given (argc is 0), then the default directory (/dev/dsk) is searched. 1115 * poolname or guid (but not both) are provided by the caller when trying 1116 * to import a specific pool. 1117 */ 1118 static nvlist_t * 1119 zpool_find_import_impl(libzfs_handle_t *hdl, importargs_t *iarg) 1120 { 1121 int i, dirs = iarg->paths; 1122 struct dirent64 *dp; 1123 char path[MAXPATHLEN]; 1124 char *end, **dir = iarg->path; 1125 size_t pathleft; 1126 nvlist_t *ret = NULL; 1127 static char *default_dir = "/dev/dsk"; 1128 pool_list_t pools = { 0 }; 1129 pool_entry_t *pe, *penext; 1130 vdev_entry_t *ve, *venext; 1131 config_entry_t *ce, *cenext; 1132 name_entry_t *ne, *nenext; 1133 avl_tree_t slice_cache; 1134 rdsk_node_t *slice; 1135 void *cookie; 1136 1137 if (dirs == 0) { 1138 dirs = 1; 1139 dir = &default_dir; 1140 } 1141 1142 /* 1143 * Go through and read the label configuration information from every 1144 * possible device, organizing the information according to pool GUID 1145 * and toplevel GUID. 1146 */ 1147 for (i = 0; i < dirs; i++) { 1148 tpool_t *t; 1149 char *rdsk; 1150 int dfd; 1151 boolean_t config_failed = B_FALSE; 1152 DIR *dirp; 1153 1154 /* use realpath to normalize the path */ 1155 if (realpath(dir[i], path) == 0) { 1156 (void) zfs_error_fmt(hdl, EZFS_BADPATH, 1157 dgettext(TEXT_DOMAIN, "cannot open '%s'"), dir[i]); 1158 goto error; 1159 } 1160 end = &path[strlen(path)]; 1161 *end++ = '/'; 1162 *end = 0; 1163 pathleft = &path[sizeof (path)] - end; 1164 1165 /* 1166 * Using raw devices instead of block devices when we're 1167 * reading the labels skips a bunch of slow operations during 1168 * close(2) processing, so we replace /dev/dsk with /dev/rdsk. 1169 */ 1170 if (strcmp(path, "/dev/dsk/") == 0) 1171 rdsk = "/dev/rdsk/"; 1172 else 1173 rdsk = path; 1174 1175 if ((dfd = open64(rdsk, O_RDONLY)) < 0 || 1176 (dirp = fdopendir(dfd)) == NULL) { 1177 if (dfd >= 0) 1178 (void) close(dfd); 1179 zfs_error_aux(hdl, strerror(errno)); 1180 (void) zfs_error_fmt(hdl, EZFS_BADPATH, 1181 dgettext(TEXT_DOMAIN, "cannot open '%s'"), 1182 rdsk); 1183 goto error; 1184 } 1185 1186 avl_create(&slice_cache, slice_cache_compare, 1187 sizeof (rdsk_node_t), offsetof(rdsk_node_t, rn_node)); 1188 /* 1189 * This is not MT-safe, but we have no MT consumers of libzfs 1190 */ 1191 while ((dp = readdir64(dirp)) != NULL) { 1192 const char *name = dp->d_name; 1193 if (name[0] == '.' && 1194 (name[1] == 0 || (name[1] == '.' && name[2] == 0))) 1195 continue; 1196 1197 slice = zfs_alloc(hdl, sizeof (rdsk_node_t)); 1198 slice->rn_name = zfs_strdup(hdl, name); 1199 slice->rn_avl = &slice_cache; 1200 slice->rn_dfd = dfd; 1201 slice->rn_hdl = hdl; 1202 slice->rn_nozpool = B_FALSE; 1203 avl_add(&slice_cache, slice); 1204 } 1205 /* 1206 * create a thread pool to do all of this in parallel; 1207 * rn_nozpool is not protected, so this is racy in that 1208 * multiple tasks could decide that the same slice can 1209 * not hold a zpool, which is benign. Also choose 1210 * double the number of processors; we hold a lot of 1211 * locks in the kernel, so going beyond this doesn't 1212 * buy us much. 1213 */ 1214 t = tpool_create(1, 2 * sysconf(_SC_NPROCESSORS_ONLN), 1215 0, NULL); 1216 for (slice = avl_first(&slice_cache); slice; 1217 (slice = avl_walk(&slice_cache, slice, 1218 AVL_AFTER))) 1219 (void) tpool_dispatch(t, zpool_open_func, slice); 1220 tpool_wait(t); 1221 tpool_destroy(t); 1222 1223 cookie = NULL; 1224 while ((slice = avl_destroy_nodes(&slice_cache, 1225 &cookie)) != NULL) { 1226 if (slice->rn_config != NULL && !config_failed) { 1227 nvlist_t *config = slice->rn_config; 1228 boolean_t matched = B_TRUE; 1229 1230 if (iarg->poolname != NULL) { 1231 char *pname; 1232 1233 matched = nvlist_lookup_string(config, 1234 ZPOOL_CONFIG_POOL_NAME, 1235 &pname) == 0 && 1236 strcmp(iarg->poolname, pname) == 0; 1237 } else if (iarg->guid != 0) { 1238 uint64_t this_guid; 1239 1240 matched = nvlist_lookup_uint64(config, 1241 ZPOOL_CONFIG_POOL_GUID, 1242 &this_guid) == 0 && 1243 iarg->guid == this_guid; 1244 } 1245 if (!matched) { 1246 nvlist_free(config); 1247 } else { 1248 /* 1249 * use the non-raw path for the config 1250 */ 1251 (void) strlcpy(end, slice->rn_name, 1252 pathleft); 1253 if (add_config(hdl, &pools, path, 1254 config) != 0) { 1255 nvlist_free(config); 1256 config_failed = B_TRUE; 1257 } 1258 } 1259 } 1260 free(slice->rn_name); 1261 free(slice); 1262 } 1263 avl_destroy(&slice_cache); 1264 1265 (void) closedir(dirp); 1266 1267 if (config_failed) 1268 goto error; 1269 } 1270 1271 ret = get_configs(hdl, &pools, iarg->can_be_active); 1272 1273 error: 1274 for (pe = pools.pools; pe != NULL; pe = penext) { 1275 penext = pe->pe_next; 1276 for (ve = pe->pe_vdevs; ve != NULL; ve = venext) { 1277 venext = ve->ve_next; 1278 for (ce = ve->ve_configs; ce != NULL; ce = cenext) { 1279 cenext = ce->ce_next; 1280 if (ce->ce_config) 1281 nvlist_free(ce->ce_config); 1282 free(ce); 1283 } 1284 free(ve); 1285 } 1286 free(pe); 1287 } 1288 1289 for (ne = pools.names; ne != NULL; ne = nenext) { 1290 nenext = ne->ne_next; 1291 free(ne->ne_name); 1292 free(ne); 1293 } 1294 1295 return (ret); 1296 } 1297 1298 nvlist_t * 1299 zpool_find_import(libzfs_handle_t *hdl, int argc, char **argv) 1300 { 1301 importargs_t iarg = { 0 }; 1302 1303 iarg.paths = argc; 1304 iarg.path = argv; 1305 1306 return (zpool_find_import_impl(hdl, &iarg)); 1307 } 1308 1309 /* 1310 * Given a cache file, return the contents as a list of importable pools. 1311 * poolname or guid (but not both) are provided by the caller when trying 1312 * to import a specific pool. 1313 */ 1314 nvlist_t * 1315 zpool_find_import_cached(libzfs_handle_t *hdl, const char *cachefile, 1316 char *poolname, uint64_t guid) 1317 { 1318 char *buf; 1319 int fd; 1320 struct stat64 statbuf; 1321 nvlist_t *raw, *src, *dst; 1322 nvlist_t *pools; 1323 nvpair_t *elem; 1324 char *name; 1325 uint64_t this_guid; 1326 boolean_t active; 1327 1328 verify(poolname == NULL || guid == 0); 1329 1330 if ((fd = open(cachefile, O_RDONLY)) < 0) { 1331 zfs_error_aux(hdl, "%s", strerror(errno)); 1332 (void) zfs_error(hdl, EZFS_BADCACHE, 1333 dgettext(TEXT_DOMAIN, "failed to open cache file")); 1334 return (NULL); 1335 } 1336 1337 if (fstat64(fd, &statbuf) != 0) { 1338 zfs_error_aux(hdl, "%s", strerror(errno)); 1339 (void) close(fd); 1340 (void) zfs_error(hdl, EZFS_BADCACHE, 1341 dgettext(TEXT_DOMAIN, "failed to get size of cache file")); 1342 return (NULL); 1343 } 1344 1345 if ((buf = zfs_alloc(hdl, statbuf.st_size)) == NULL) { 1346 (void) close(fd); 1347 return (NULL); 1348 } 1349 1350 if (read(fd, buf, statbuf.st_size) != statbuf.st_size) { 1351 (void) close(fd); 1352 free(buf); 1353 (void) zfs_error(hdl, EZFS_BADCACHE, 1354 dgettext(TEXT_DOMAIN, 1355 "failed to read cache file contents")); 1356 return (NULL); 1357 } 1358 1359 (void) close(fd); 1360 1361 if (nvlist_unpack(buf, statbuf.st_size, &raw, 0) != 0) { 1362 free(buf); 1363 (void) zfs_error(hdl, EZFS_BADCACHE, 1364 dgettext(TEXT_DOMAIN, 1365 "invalid or corrupt cache file contents")); 1366 return (NULL); 1367 } 1368 1369 free(buf); 1370 1371 /* 1372 * Go through and get the current state of the pools and refresh their 1373 * state. 1374 */ 1375 if (nvlist_alloc(&pools, 0, 0) != 0) { 1376 (void) no_memory(hdl); 1377 nvlist_free(raw); 1378 return (NULL); 1379 } 1380 1381 elem = NULL; 1382 while ((elem = nvlist_next_nvpair(raw, elem)) != NULL) { 1383 src = fnvpair_value_nvlist(elem); 1384 1385 name = fnvlist_lookup_string(src, ZPOOL_CONFIG_POOL_NAME); 1386 if (poolname != NULL && strcmp(poolname, name) != 0) 1387 continue; 1388 1389 this_guid = fnvlist_lookup_uint64(src, ZPOOL_CONFIG_POOL_GUID); 1390 if (guid != 0 && guid != this_guid) 1391 continue; 1392 1393 if (pool_active(hdl, name, this_guid, &active) != 0) { 1394 nvlist_free(raw); 1395 nvlist_free(pools); 1396 return (NULL); 1397 } 1398 1399 if (active) 1400 continue; 1401 1402 if ((dst = refresh_config(hdl, src)) == NULL) { 1403 nvlist_free(raw); 1404 nvlist_free(pools); 1405 return (NULL); 1406 } 1407 1408 if (nvlist_add_nvlist(pools, nvpair_name(elem), dst) != 0) { 1409 (void) no_memory(hdl); 1410 nvlist_free(dst); 1411 nvlist_free(raw); 1412 nvlist_free(pools); 1413 return (NULL); 1414 } 1415 nvlist_free(dst); 1416 } 1417 1418 nvlist_free(raw); 1419 return (pools); 1420 } 1421 1422 static int 1423 name_or_guid_exists(zpool_handle_t *zhp, void *data) 1424 { 1425 importargs_t *import = data; 1426 int found = 0; 1427 1428 if (import->poolname != NULL) { 1429 char *pool_name; 1430 1431 verify(nvlist_lookup_string(zhp->zpool_config, 1432 ZPOOL_CONFIG_POOL_NAME, &pool_name) == 0); 1433 if (strcmp(pool_name, import->poolname) == 0) 1434 found = 1; 1435 } else { 1436 uint64_t pool_guid; 1437 1438 verify(nvlist_lookup_uint64(zhp->zpool_config, 1439 ZPOOL_CONFIG_POOL_GUID, &pool_guid) == 0); 1440 if (pool_guid == import->guid) 1441 found = 1; 1442 } 1443 1444 zpool_close(zhp); 1445 return (found); 1446 } 1447 1448 nvlist_t * 1449 zpool_search_import(libzfs_handle_t *hdl, importargs_t *import) 1450 { 1451 verify(import->poolname == NULL || import->guid == 0); 1452 1453 if (import->unique) 1454 import->exists = zpool_iter(hdl, name_or_guid_exists, import); 1455 1456 if (import->cachefile != NULL) 1457 return (zpool_find_import_cached(hdl, import->cachefile, 1458 import->poolname, import->guid)); 1459 1460 return (zpool_find_import_impl(hdl, import)); 1461 } 1462 1463 boolean_t 1464 find_guid(nvlist_t *nv, uint64_t guid) 1465 { 1466 uint64_t tmp; 1467 nvlist_t **child; 1468 uint_t c, children; 1469 1470 verify(nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID, &tmp) == 0); 1471 if (tmp == guid) 1472 return (B_TRUE); 1473 1474 if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_CHILDREN, 1475 &child, &children) == 0) { 1476 for (c = 0; c < children; c++) 1477 if (find_guid(child[c], guid)) 1478 return (B_TRUE); 1479 } 1480 1481 return (B_FALSE); 1482 } 1483 1484 typedef struct aux_cbdata { 1485 const char *cb_type; 1486 uint64_t cb_guid; 1487 zpool_handle_t *cb_zhp; 1488 } aux_cbdata_t; 1489 1490 static int 1491 find_aux(zpool_handle_t *zhp, void *data) 1492 { 1493 aux_cbdata_t *cbp = data; 1494 nvlist_t **list; 1495 uint_t i, count; 1496 uint64_t guid; 1497 nvlist_t *nvroot; 1498 1499 verify(nvlist_lookup_nvlist(zhp->zpool_config, ZPOOL_CONFIG_VDEV_TREE, 1500 &nvroot) == 0); 1501 1502 if (nvlist_lookup_nvlist_array(nvroot, cbp->cb_type, 1503 &list, &count) == 0) { 1504 for (i = 0; i < count; i++) { 1505 verify(nvlist_lookup_uint64(list[i], 1506 ZPOOL_CONFIG_GUID, &guid) == 0); 1507 if (guid == cbp->cb_guid) { 1508 cbp->cb_zhp = zhp; 1509 return (1); 1510 } 1511 } 1512 } 1513 1514 zpool_close(zhp); 1515 return (0); 1516 } 1517 1518 /* 1519 * Determines if the pool is in use. If so, it returns true and the state of 1520 * the pool as well as the name of the pool. Both strings are allocated and 1521 * must be freed by the caller. 1522 */ 1523 int 1524 zpool_in_use(libzfs_handle_t *hdl, int fd, pool_state_t *state, char **namestr, 1525 boolean_t *inuse) 1526 { 1527 nvlist_t *config; 1528 char *name; 1529 boolean_t ret; 1530 uint64_t guid, vdev_guid; 1531 zpool_handle_t *zhp; 1532 nvlist_t *pool_config; 1533 uint64_t stateval, isspare; 1534 aux_cbdata_t cb = { 0 }; 1535 boolean_t isactive; 1536 1537 *inuse = B_FALSE; 1538 1539 if (zpool_read_label(fd, &config) != 0) { 1540 (void) no_memory(hdl); 1541 return (-1); 1542 } 1543 1544 if (config == NULL) 1545 return (0); 1546 1547 verify(nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_STATE, 1548 &stateval) == 0); 1549 verify(nvlist_lookup_uint64(config, ZPOOL_CONFIG_GUID, 1550 &vdev_guid) == 0); 1551 1552 if (stateval != POOL_STATE_SPARE && stateval != POOL_STATE_L2CACHE) { 1553 verify(nvlist_lookup_string(config, ZPOOL_CONFIG_POOL_NAME, 1554 &name) == 0); 1555 verify(nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_GUID, 1556 &guid) == 0); 1557 } 1558 1559 switch (stateval) { 1560 case POOL_STATE_EXPORTED: 1561 /* 1562 * A pool with an exported state may in fact be imported 1563 * read-only, so check the in-core state to see if it's 1564 * active and imported read-only. If it is, set 1565 * its state to active. 1566 */ 1567 if (pool_active(hdl, name, guid, &isactive) == 0 && isactive && 1568 (zhp = zpool_open_canfail(hdl, name)) != NULL) { 1569 if (zpool_get_prop_int(zhp, ZPOOL_PROP_READONLY, NULL)) 1570 stateval = POOL_STATE_ACTIVE; 1571 1572 /* 1573 * All we needed the zpool handle for is the 1574 * readonly prop check. 1575 */ 1576 zpool_close(zhp); 1577 } 1578 1579 ret = B_TRUE; 1580 break; 1581 1582 case POOL_STATE_ACTIVE: 1583 /* 1584 * For an active pool, we have to determine if it's really part 1585 * of a currently active pool (in which case the pool will exist 1586 * and the guid will be the same), or whether it's part of an 1587 * active pool that was disconnected without being explicitly 1588 * exported. 1589 */ 1590 if (pool_active(hdl, name, guid, &isactive) != 0) { 1591 nvlist_free(config); 1592 return (-1); 1593 } 1594 1595 if (isactive) { 1596 /* 1597 * Because the device may have been removed while 1598 * offlined, we only report it as active if the vdev is 1599 * still present in the config. Otherwise, pretend like 1600 * it's not in use. 1601 */ 1602 if ((zhp = zpool_open_canfail(hdl, name)) != NULL && 1603 (pool_config = zpool_get_config(zhp, NULL)) 1604 != NULL) { 1605 nvlist_t *nvroot; 1606 1607 verify(nvlist_lookup_nvlist(pool_config, 1608 ZPOOL_CONFIG_VDEV_TREE, &nvroot) == 0); 1609 ret = find_guid(nvroot, vdev_guid); 1610 } else { 1611 ret = B_FALSE; 1612 } 1613 1614 /* 1615 * If this is an active spare within another pool, we 1616 * treat it like an unused hot spare. This allows the 1617 * user to create a pool with a hot spare that currently 1618 * in use within another pool. Since we return B_TRUE, 1619 * libdiskmgt will continue to prevent generic consumers 1620 * from using the device. 1621 */ 1622 if (ret && nvlist_lookup_uint64(config, 1623 ZPOOL_CONFIG_IS_SPARE, &isspare) == 0 && isspare) 1624 stateval = POOL_STATE_SPARE; 1625 1626 if (zhp != NULL) 1627 zpool_close(zhp); 1628 } else { 1629 stateval = POOL_STATE_POTENTIALLY_ACTIVE; 1630 ret = B_TRUE; 1631 } 1632 break; 1633 1634 case POOL_STATE_SPARE: 1635 /* 1636 * For a hot spare, it can be either definitively in use, or 1637 * potentially active. To determine if it's in use, we iterate 1638 * over all pools in the system and search for one with a spare 1639 * with a matching guid. 1640 * 1641 * Due to the shared nature of spares, we don't actually report 1642 * the potentially active case as in use. This means the user 1643 * can freely create pools on the hot spares of exported pools, 1644 * but to do otherwise makes the resulting code complicated, and 1645 * we end up having to deal with this case anyway. 1646 */ 1647 cb.cb_zhp = NULL; 1648 cb.cb_guid = vdev_guid; 1649 cb.cb_type = ZPOOL_CONFIG_SPARES; 1650 if (zpool_iter(hdl, find_aux, &cb) == 1) { 1651 name = (char *)zpool_get_name(cb.cb_zhp); 1652 ret = B_TRUE; 1653 } else { 1654 ret = B_FALSE; 1655 } 1656 break; 1657 1658 case POOL_STATE_L2CACHE: 1659 1660 /* 1661 * Check if any pool is currently using this l2cache device. 1662 */ 1663 cb.cb_zhp = NULL; 1664 cb.cb_guid = vdev_guid; 1665 cb.cb_type = ZPOOL_CONFIG_L2CACHE; 1666 if (zpool_iter(hdl, find_aux, &cb) == 1) { 1667 name = (char *)zpool_get_name(cb.cb_zhp); 1668 ret = B_TRUE; 1669 } else { 1670 ret = B_FALSE; 1671 } 1672 break; 1673 1674 default: 1675 ret = B_FALSE; 1676 } 1677 1678 1679 if (ret) { 1680 if ((*namestr = zfs_strdup(hdl, name)) == NULL) { 1681 if (cb.cb_zhp) 1682 zpool_close(cb.cb_zhp); 1683 nvlist_free(config); 1684 return (-1); 1685 } 1686 *state = (pool_state_t)stateval; 1687 } 1688 1689 if (cb.cb_zhp) 1690 zpool_close(cb.cb_zhp); 1691 1692 nvlist_free(config); 1693 *inuse = ret; 1694 return (0); 1695 }