libzfs_import.c revision 332094
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 (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 24 * Copyright (c) 2012, 2015 by Delphix. All rights reserved. 25 * Copyright 2015 RackTop Systems. 26 * Copyright 2016 Nexenta Systems, Inc. 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 <thread_pool.h> 57#include <libgeom.h> 58 59#include <sys/vdev_impl.h> 60 61#include "libzfs.h" 62#include "libzfs_impl.h" 63 64/* 65 * Intermediate structures used to gather configuration information. 66 */ 67typedef struct config_entry { 68 uint64_t ce_txg; 69 nvlist_t *ce_config; 70 struct config_entry *ce_next; 71} config_entry_t; 72 73typedef struct vdev_entry { 74 uint64_t ve_guid; 75 config_entry_t *ve_configs; 76 struct vdev_entry *ve_next; 77} vdev_entry_t; 78 79typedef struct pool_entry { 80 uint64_t pe_guid; 81 vdev_entry_t *pe_vdevs; 82 struct pool_entry *pe_next; 83} pool_entry_t; 84 85typedef struct name_entry { 86 char *ne_name; 87 uint64_t ne_guid; 88 struct name_entry *ne_next; 89} name_entry_t; 90 91typedef struct pool_list { 92 pool_entry_t *pools; 93 name_entry_t *names; 94} pool_list_t; 95 96static char * 97get_devid(const char *path) 98{ 99#ifdef have_devid 100 int fd; 101 ddi_devid_t devid; 102 char *minor, *ret; 103 104 if ((fd = open(path, O_RDONLY)) < 0) 105 return (NULL); 106 107 minor = NULL; 108 ret = NULL; 109 if (devid_get(fd, &devid) == 0) { 110 if (devid_get_minor_name(fd, &minor) == 0) 111 ret = devid_str_encode(devid, minor); 112 if (minor != NULL) 113 devid_str_free(minor); 114 devid_free(devid); 115 } 116 (void) close(fd); 117 118 return (ret); 119#else 120 return (NULL); 121#endif 122} 123 124 125/* 126 * Go through and fix up any path and/or devid information for the given vdev 127 * configuration. 128 */ 129static int 130fix_paths(nvlist_t *nv, name_entry_t *names) 131{ 132 nvlist_t **child; 133 uint_t c, children; 134 uint64_t guid; 135 name_entry_t *ne, *best; 136 char *path, *devid; 137 int matched; 138 139 if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_CHILDREN, 140 &child, &children) == 0) { 141 for (c = 0; c < children; c++) 142 if (fix_paths(child[c], names) != 0) 143 return (-1); 144 return (0); 145 } 146 147 /* 148 * This is a leaf (file or disk) vdev. In either case, go through 149 * the name list and see if we find a matching guid. If so, replace 150 * the path and see if we can calculate a new devid. 151 * 152 * There may be multiple names associated with a particular guid, in 153 * which case we have overlapping slices or multiple paths to the same 154 * disk. If this is the case, then we want to pick the path that is 155 * the most similar to the original, where "most similar" is the number 156 * of matching characters starting from the end of the path. This will 157 * preserve slice numbers even if the disks have been reorganized, and 158 * will also catch preferred disk names if multiple paths exist. 159 */ 160 verify(nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID, &guid) == 0); 161 if (nvlist_lookup_string(nv, ZPOOL_CONFIG_PATH, &path) != 0) 162 path = NULL; 163 164 matched = 0; 165 best = NULL; 166 for (ne = names; ne != NULL; ne = ne->ne_next) { 167 if (ne->ne_guid == guid) { 168 const char *src, *dst; 169 int count; 170 171 if (path == NULL) { 172 best = ne; 173 break; 174 } 175 176 src = ne->ne_name + strlen(ne->ne_name) - 1; 177 dst = path + strlen(path) - 1; 178 for (count = 0; src >= ne->ne_name && dst >= path; 179 src--, dst--, count++) 180 if (*src != *dst) 181 break; 182 183 /* 184 * At this point, 'count' is the number of characters 185 * matched from the end. 186 */ 187 if (count > matched || best == NULL) { 188 best = ne; 189 matched = count; 190 } 191 } 192 } 193 194 if (best == NULL) 195 return (0); 196 197 if (nvlist_add_string(nv, ZPOOL_CONFIG_PATH, best->ne_name) != 0) 198 return (-1); 199 200 if ((devid = get_devid(best->ne_name)) == NULL) { 201 (void) nvlist_remove_all(nv, ZPOOL_CONFIG_DEVID); 202 } else { 203 if (nvlist_add_string(nv, ZPOOL_CONFIG_DEVID, devid) != 0) { 204 devid_str_free(devid); 205 return (-1); 206 } 207 devid_str_free(devid); 208 } 209 210 return (0); 211} 212 213/* 214 * Add the given configuration to the list of known devices. 215 */ 216static int 217add_config(libzfs_handle_t *hdl, pool_list_t *pl, const char *path, 218 nvlist_t *config) 219{ 220 uint64_t pool_guid, vdev_guid, top_guid, txg, state; 221 pool_entry_t *pe; 222 vdev_entry_t *ve; 223 config_entry_t *ce; 224 name_entry_t *ne; 225 226 /* 227 * If this is a hot spare not currently in use or level 2 cache 228 * device, add it to the list of names to translate, but don't do 229 * anything else. 230 */ 231 if (nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_STATE, 232 &state) == 0 && 233 (state == POOL_STATE_SPARE || state == POOL_STATE_L2CACHE) && 234 nvlist_lookup_uint64(config, ZPOOL_CONFIG_GUID, &vdev_guid) == 0) { 235 if ((ne = zfs_alloc(hdl, sizeof (name_entry_t))) == NULL) 236 return (-1); 237 238 if ((ne->ne_name = zfs_strdup(hdl, path)) == NULL) { 239 free(ne); 240 return (-1); 241 } 242 ne->ne_guid = vdev_guid; 243 ne->ne_next = pl->names; 244 pl->names = ne; 245 return (0); 246 } 247 248 /* 249 * If we have a valid config but cannot read any of these fields, then 250 * it means we have a half-initialized label. In vdev_label_init() 251 * we write a label with txg == 0 so that we can identify the device 252 * in case the user refers to the same disk later on. If we fail to 253 * create the pool, we'll be left with a label in this state 254 * which should not be considered part of a valid pool. 255 */ 256 if (nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_GUID, 257 &pool_guid) != 0 || 258 nvlist_lookup_uint64(config, ZPOOL_CONFIG_GUID, 259 &vdev_guid) != 0 || 260 nvlist_lookup_uint64(config, ZPOOL_CONFIG_TOP_GUID, 261 &top_guid) != 0 || 262 nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_TXG, 263 &txg) != 0 || txg == 0) { 264 nvlist_free(config); 265 return (0); 266 } 267 268 /* 269 * First, see if we know about this pool. If not, then add it to the 270 * list of known pools. 271 */ 272 for (pe = pl->pools; pe != NULL; pe = pe->pe_next) { 273 if (pe->pe_guid == pool_guid) 274 break; 275 } 276 277 if (pe == NULL) { 278 if ((pe = zfs_alloc(hdl, sizeof (pool_entry_t))) == NULL) { 279 nvlist_free(config); 280 return (-1); 281 } 282 pe->pe_guid = pool_guid; 283 pe->pe_next = pl->pools; 284 pl->pools = pe; 285 } 286 287 /* 288 * Second, see if we know about this toplevel vdev. Add it if its 289 * missing. 290 */ 291 for (ve = pe->pe_vdevs; ve != NULL; ve = ve->ve_next) { 292 if (ve->ve_guid == top_guid) 293 break; 294 } 295 296 if (ve == NULL) { 297 if ((ve = zfs_alloc(hdl, sizeof (vdev_entry_t))) == NULL) { 298 nvlist_free(config); 299 return (-1); 300 } 301 ve->ve_guid = top_guid; 302 ve->ve_next = pe->pe_vdevs; 303 pe->pe_vdevs = ve; 304 } 305 306 /* 307 * Third, see if we have a config with a matching transaction group. If 308 * so, then we do nothing. Otherwise, add it to the list of known 309 * configs. 310 */ 311 for (ce = ve->ve_configs; ce != NULL; ce = ce->ce_next) { 312 if (ce->ce_txg == txg) 313 break; 314 } 315 316 if (ce == NULL) { 317 if ((ce = zfs_alloc(hdl, sizeof (config_entry_t))) == NULL) { 318 nvlist_free(config); 319 return (-1); 320 } 321 ce->ce_txg = txg; 322 ce->ce_config = config; 323 ce->ce_next = ve->ve_configs; 324 ve->ve_configs = ce; 325 } else { 326 nvlist_free(config); 327 } 328 329 /* 330 * At this point we've successfully added our config to the list of 331 * known configs. The last thing to do is add the vdev guid -> path 332 * mappings so that we can fix up the configuration as necessary before 333 * doing the import. 334 */ 335 if ((ne = zfs_alloc(hdl, sizeof (name_entry_t))) == NULL) 336 return (-1); 337 338 if ((ne->ne_name = zfs_strdup(hdl, path)) == NULL) { 339 free(ne); 340 return (-1); 341 } 342 343 ne->ne_guid = vdev_guid; 344 ne->ne_next = pl->names; 345 pl->names = ne; 346 347 return (0); 348} 349 350/* 351 * Returns true if the named pool matches the given GUID. 352 */ 353static int 354pool_active(libzfs_handle_t *hdl, const char *name, uint64_t guid, 355 boolean_t *isactive) 356{ 357 zpool_handle_t *zhp; 358 uint64_t theguid; 359 360 if (zpool_open_silent(hdl, name, &zhp) != 0) 361 return (-1); 362 363 if (zhp == NULL) { 364 *isactive = B_FALSE; 365 return (0); 366 } 367 368 verify(nvlist_lookup_uint64(zhp->zpool_config, ZPOOL_CONFIG_POOL_GUID, 369 &theguid) == 0); 370 371 zpool_close(zhp); 372 373 *isactive = (theguid == guid); 374 return (0); 375} 376 377static nvlist_t * 378refresh_config(libzfs_handle_t *hdl, nvlist_t *config) 379{ 380 nvlist_t *nvl; 381 zfs_cmd_t zc = { 0 }; 382 int err; 383 384 if (zcmd_write_conf_nvlist(hdl, &zc, config) != 0) 385 return (NULL); 386 387 if (zcmd_alloc_dst_nvlist(hdl, &zc, 388 zc.zc_nvlist_conf_size * 2) != 0) { 389 zcmd_free_nvlists(&zc); 390 return (NULL); 391 } 392 393 while ((err = ioctl(hdl->libzfs_fd, ZFS_IOC_POOL_TRYIMPORT, 394 &zc)) != 0 && errno == ENOMEM) { 395 if (zcmd_expand_dst_nvlist(hdl, &zc) != 0) { 396 zcmd_free_nvlists(&zc); 397 return (NULL); 398 } 399 } 400 401 if (err) { 402 zcmd_free_nvlists(&zc); 403 return (NULL); 404 } 405 406 if (zcmd_read_dst_nvlist(hdl, &zc, &nvl) != 0) { 407 zcmd_free_nvlists(&zc); 408 return (NULL); 409 } 410 411 zcmd_free_nvlists(&zc); 412 return (nvl); 413} 414 415/* 416 * Determine if the vdev id is a hole in the namespace. 417 */ 418boolean_t 419vdev_is_hole(uint64_t *hole_array, uint_t holes, uint_t id) 420{ 421 for (int c = 0; c < holes; c++) { 422 423 /* Top-level is a hole */ 424 if (hole_array[c] == id) 425 return (B_TRUE); 426 } 427 return (B_FALSE); 428} 429 430/* 431 * Convert our list of pools into the definitive set of configurations. We 432 * start by picking the best config for each toplevel vdev. Once that's done, 433 * we assemble the toplevel vdevs into a full config for the pool. We make a 434 * pass to fix up any incorrect paths, and then add it to the main list to 435 * return to the user. 436 */ 437static nvlist_t * 438get_configs(libzfs_handle_t *hdl, pool_list_t *pl, boolean_t active_ok) 439{ 440 pool_entry_t *pe; 441 vdev_entry_t *ve; 442 config_entry_t *ce; 443 nvlist_t *ret = NULL, *config = NULL, *tmp = NULL, *nvtop, *nvroot; 444 nvlist_t **spares, **l2cache; 445 uint_t i, nspares, nl2cache; 446 boolean_t config_seen; 447 uint64_t best_txg; 448 char *name, *hostname = NULL; 449 uint64_t guid; 450 uint_t children = 0; 451 nvlist_t **child = NULL; 452 uint_t holes; 453 uint64_t *hole_array, max_id; 454 uint_t c; 455 boolean_t isactive; 456 uint64_t hostid; 457 nvlist_t *nvl; 458 boolean_t found_one = B_FALSE; 459 boolean_t valid_top_config = B_FALSE; 460 461 if (nvlist_alloc(&ret, 0, 0) != 0) 462 goto nomem; 463 464 for (pe = pl->pools; pe != NULL; pe = pe->pe_next) { 465 uint64_t id, max_txg = 0; 466 467 if (nvlist_alloc(&config, NV_UNIQUE_NAME, 0) != 0) 468 goto nomem; 469 config_seen = B_FALSE; 470 471 /* 472 * Iterate over all toplevel vdevs. Grab the pool configuration 473 * from the first one we find, and then go through the rest and 474 * add them as necessary to the 'vdevs' member of the config. 475 */ 476 for (ve = pe->pe_vdevs; ve != NULL; ve = ve->ve_next) { 477 478 /* 479 * Determine the best configuration for this vdev by 480 * selecting the config with the latest transaction 481 * group. 482 */ 483 best_txg = 0; 484 for (ce = ve->ve_configs; ce != NULL; 485 ce = ce->ce_next) { 486 487 if (ce->ce_txg > best_txg) { 488 tmp = ce->ce_config; 489 best_txg = ce->ce_txg; 490 } 491 } 492 493 /* 494 * We rely on the fact that the max txg for the 495 * pool will contain the most up-to-date information 496 * about the valid top-levels in the vdev namespace. 497 */ 498 if (best_txg > max_txg) { 499 (void) nvlist_remove(config, 500 ZPOOL_CONFIG_VDEV_CHILDREN, 501 DATA_TYPE_UINT64); 502 (void) nvlist_remove(config, 503 ZPOOL_CONFIG_HOLE_ARRAY, 504 DATA_TYPE_UINT64_ARRAY); 505 506 max_txg = best_txg; 507 hole_array = NULL; 508 holes = 0; 509 max_id = 0; 510 valid_top_config = B_FALSE; 511 512 if (nvlist_lookup_uint64(tmp, 513 ZPOOL_CONFIG_VDEV_CHILDREN, &max_id) == 0) { 514 verify(nvlist_add_uint64(config, 515 ZPOOL_CONFIG_VDEV_CHILDREN, 516 max_id) == 0); 517 valid_top_config = B_TRUE; 518 } 519 520 if (nvlist_lookup_uint64_array(tmp, 521 ZPOOL_CONFIG_HOLE_ARRAY, &hole_array, 522 &holes) == 0) { 523 verify(nvlist_add_uint64_array(config, 524 ZPOOL_CONFIG_HOLE_ARRAY, 525 hole_array, holes) == 0); 526 } 527 } 528 529 if (!config_seen) { 530 /* 531 * Copy the relevant pieces of data to the pool 532 * configuration: 533 * 534 * version 535 * pool guid 536 * name 537 * comment (if available) 538 * pool state 539 * hostid (if available) 540 * hostname (if available) 541 */ 542 uint64_t state, version; 543 char *comment = NULL; 544 545 version = fnvlist_lookup_uint64(tmp, 546 ZPOOL_CONFIG_VERSION); 547 fnvlist_add_uint64(config, 548 ZPOOL_CONFIG_VERSION, version); 549 guid = fnvlist_lookup_uint64(tmp, 550 ZPOOL_CONFIG_POOL_GUID); 551 fnvlist_add_uint64(config, 552 ZPOOL_CONFIG_POOL_GUID, guid); 553 name = fnvlist_lookup_string(tmp, 554 ZPOOL_CONFIG_POOL_NAME); 555 fnvlist_add_string(config, 556 ZPOOL_CONFIG_POOL_NAME, name); 557 558 if (nvlist_lookup_string(tmp, 559 ZPOOL_CONFIG_COMMENT, &comment) == 0) 560 fnvlist_add_string(config, 561 ZPOOL_CONFIG_COMMENT, comment); 562 563 state = fnvlist_lookup_uint64(tmp, 564 ZPOOL_CONFIG_POOL_STATE); 565 fnvlist_add_uint64(config, 566 ZPOOL_CONFIG_POOL_STATE, state); 567 568 hostid = 0; 569 if (nvlist_lookup_uint64(tmp, 570 ZPOOL_CONFIG_HOSTID, &hostid) == 0) { 571 fnvlist_add_uint64(config, 572 ZPOOL_CONFIG_HOSTID, hostid); 573 hostname = fnvlist_lookup_string(tmp, 574 ZPOOL_CONFIG_HOSTNAME); 575 fnvlist_add_string(config, 576 ZPOOL_CONFIG_HOSTNAME, hostname); 577 } 578 579 config_seen = B_TRUE; 580 } 581 582 /* 583 * Add this top-level vdev to the child array. 584 */ 585 verify(nvlist_lookup_nvlist(tmp, 586 ZPOOL_CONFIG_VDEV_TREE, &nvtop) == 0); 587 verify(nvlist_lookup_uint64(nvtop, ZPOOL_CONFIG_ID, 588 &id) == 0); 589 590 if (id >= children) { 591 nvlist_t **newchild; 592 593 newchild = zfs_alloc(hdl, (id + 1) * 594 sizeof (nvlist_t *)); 595 if (newchild == NULL) 596 goto nomem; 597 598 for (c = 0; c < children; c++) 599 newchild[c] = child[c]; 600 601 free(child); 602 child = newchild; 603 children = id + 1; 604 } 605 if (nvlist_dup(nvtop, &child[id], 0) != 0) 606 goto nomem; 607 608 } 609 610 /* 611 * If we have information about all the top-levels then 612 * clean up the nvlist which we've constructed. This 613 * means removing any extraneous devices that are 614 * beyond the valid range or adding devices to the end 615 * of our array which appear to be missing. 616 */ 617 if (valid_top_config) { 618 if (max_id < children) { 619 for (c = max_id; c < children; c++) 620 nvlist_free(child[c]); 621 children = max_id; 622 } else if (max_id > children) { 623 nvlist_t **newchild; 624 625 newchild = zfs_alloc(hdl, (max_id) * 626 sizeof (nvlist_t *)); 627 if (newchild == NULL) 628 goto nomem; 629 630 for (c = 0; c < children; c++) 631 newchild[c] = child[c]; 632 633 free(child); 634 child = newchild; 635 children = max_id; 636 } 637 } 638 639 verify(nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_GUID, 640 &guid) == 0); 641 642 /* 643 * The vdev namespace may contain holes as a result of 644 * device removal. We must add them back into the vdev 645 * tree before we process any missing devices. 646 */ 647 if (holes > 0) { 648 ASSERT(valid_top_config); 649 650 for (c = 0; c < children; c++) { 651 nvlist_t *holey; 652 653 if (child[c] != NULL || 654 !vdev_is_hole(hole_array, holes, c)) 655 continue; 656 657 if (nvlist_alloc(&holey, NV_UNIQUE_NAME, 658 0) != 0) 659 goto nomem; 660 661 /* 662 * Holes in the namespace are treated as 663 * "hole" top-level vdevs and have a 664 * special flag set on them. 665 */ 666 if (nvlist_add_string(holey, 667 ZPOOL_CONFIG_TYPE, 668 VDEV_TYPE_HOLE) != 0 || 669 nvlist_add_uint64(holey, 670 ZPOOL_CONFIG_ID, c) != 0 || 671 nvlist_add_uint64(holey, 672 ZPOOL_CONFIG_GUID, 0ULL) != 0) { 673 nvlist_free(holey); 674 goto nomem; 675 } 676 child[c] = holey; 677 } 678 } 679 680 /* 681 * Look for any missing top-level vdevs. If this is the case, 682 * create a faked up 'missing' vdev as a placeholder. We cannot 683 * simply compress the child array, because the kernel performs 684 * certain checks to make sure the vdev IDs match their location 685 * in the configuration. 686 */ 687 for (c = 0; c < children; c++) { 688 if (child[c] == NULL) { 689 nvlist_t *missing; 690 if (nvlist_alloc(&missing, NV_UNIQUE_NAME, 691 0) != 0) 692 goto nomem; 693 if (nvlist_add_string(missing, 694 ZPOOL_CONFIG_TYPE, 695 VDEV_TYPE_MISSING) != 0 || 696 nvlist_add_uint64(missing, 697 ZPOOL_CONFIG_ID, c) != 0 || 698 nvlist_add_uint64(missing, 699 ZPOOL_CONFIG_GUID, 0ULL) != 0) { 700 nvlist_free(missing); 701 goto nomem; 702 } 703 child[c] = missing; 704 } 705 } 706 707 /* 708 * Put all of this pool's top-level vdevs into a root vdev. 709 */ 710 if (nvlist_alloc(&nvroot, NV_UNIQUE_NAME, 0) != 0) 711 goto nomem; 712 if (nvlist_add_string(nvroot, ZPOOL_CONFIG_TYPE, 713 VDEV_TYPE_ROOT) != 0 || 714 nvlist_add_uint64(nvroot, ZPOOL_CONFIG_ID, 0ULL) != 0 || 715 nvlist_add_uint64(nvroot, ZPOOL_CONFIG_GUID, guid) != 0 || 716 nvlist_add_nvlist_array(nvroot, ZPOOL_CONFIG_CHILDREN, 717 child, children) != 0) { 718 nvlist_free(nvroot); 719 goto nomem; 720 } 721 722 for (c = 0; c < children; c++) 723 nvlist_free(child[c]); 724 free(child); 725 children = 0; 726 child = NULL; 727 728 /* 729 * Go through and fix up any paths and/or devids based on our 730 * known list of vdev GUID -> path mappings. 731 */ 732 if (fix_paths(nvroot, pl->names) != 0) { 733 nvlist_free(nvroot); 734 goto nomem; 735 } 736 737 /* 738 * Add the root vdev to this pool's configuration. 739 */ 740 if (nvlist_add_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, 741 nvroot) != 0) { 742 nvlist_free(nvroot); 743 goto nomem; 744 } 745 nvlist_free(nvroot); 746 747 /* 748 * zdb uses this path to report on active pools that were 749 * imported or created using -R. 750 */ 751 if (active_ok) 752 goto add_pool; 753 754 /* 755 * Determine if this pool is currently active, in which case we 756 * can't actually import it. 757 */ 758 verify(nvlist_lookup_string(config, ZPOOL_CONFIG_POOL_NAME, 759 &name) == 0); 760 verify(nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_GUID, 761 &guid) == 0); 762 763 if (pool_active(hdl, name, guid, &isactive) != 0) 764 goto error; 765 766 if (isactive) { 767 nvlist_free(config); 768 config = NULL; 769 continue; 770 } 771 772 if ((nvl = refresh_config(hdl, config)) == NULL) { 773 nvlist_free(config); 774 config = NULL; 775 continue; 776 } 777 778 nvlist_free(config); 779 config = nvl; 780 781 /* 782 * Go through and update the paths for spares, now that we have 783 * them. 784 */ 785 verify(nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, 786 &nvroot) == 0); 787 if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_SPARES, 788 &spares, &nspares) == 0) { 789 for (i = 0; i < nspares; i++) { 790 if (fix_paths(spares[i], pl->names) != 0) 791 goto nomem; 792 } 793 } 794 795 /* 796 * Update the paths for l2cache devices. 797 */ 798 if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_L2CACHE, 799 &l2cache, &nl2cache) == 0) { 800 for (i = 0; i < nl2cache; i++) { 801 if (fix_paths(l2cache[i], pl->names) != 0) 802 goto nomem; 803 } 804 } 805 806 /* 807 * Restore the original information read from the actual label. 808 */ 809 (void) nvlist_remove(config, ZPOOL_CONFIG_HOSTID, 810 DATA_TYPE_UINT64); 811 (void) nvlist_remove(config, ZPOOL_CONFIG_HOSTNAME, 812 DATA_TYPE_STRING); 813 if (hostid != 0) { 814 verify(nvlist_add_uint64(config, ZPOOL_CONFIG_HOSTID, 815 hostid) == 0); 816 verify(nvlist_add_string(config, ZPOOL_CONFIG_HOSTNAME, 817 hostname) == 0); 818 } 819 820add_pool: 821 /* 822 * Add this pool to the list of configs. 823 */ 824 verify(nvlist_lookup_string(config, ZPOOL_CONFIG_POOL_NAME, 825 &name) == 0); 826 if (nvlist_add_nvlist(ret, name, config) != 0) 827 goto nomem; 828 829 found_one = B_TRUE; 830 nvlist_free(config); 831 config = NULL; 832 } 833 834 if (!found_one) { 835 nvlist_free(ret); 836 ret = NULL; 837 } 838 839 return (ret); 840 841nomem: 842 (void) no_memory(hdl); 843error: 844 nvlist_free(config); 845 nvlist_free(ret); 846 for (c = 0; c < children; c++) 847 nvlist_free(child[c]); 848 free(child); 849 850 return (NULL); 851} 852 853/* 854 * Return the offset of the given label. 855 */ 856static uint64_t 857label_offset(uint64_t size, int l) 858{ 859 ASSERT(P2PHASE_TYPED(size, sizeof (vdev_label_t), uint64_t) == 0); 860 return (l * sizeof (vdev_label_t) + (l < VDEV_LABELS / 2 ? 861 0 : size - VDEV_LABELS * sizeof (vdev_label_t))); 862} 863 864/* 865 * Given a file descriptor, read the label information and return an nvlist 866 * describing the configuration, if there is one. 867 * Return 0 on success, or -1 on failure 868 */ 869int 870zpool_read_label(int fd, nvlist_t **config) 871{ 872 struct stat64 statbuf; 873 int l; 874 vdev_label_t *label; 875 uint64_t state, txg, size; 876 877 *config = NULL; 878 879 if (fstat64(fd, &statbuf) == -1) 880 return (-1); 881 size = P2ALIGN_TYPED(statbuf.st_size, sizeof (vdev_label_t), uint64_t); 882 883 if ((label = malloc(sizeof (vdev_label_t))) == NULL) 884 return (-1); 885 886 for (l = 0; l < VDEV_LABELS; l++) { 887 if (pread64(fd, label, sizeof (vdev_label_t), 888 label_offset(size, l)) != sizeof (vdev_label_t)) 889 continue; 890 891 if (nvlist_unpack(label->vl_vdev_phys.vp_nvlist, 892 sizeof (label->vl_vdev_phys.vp_nvlist), config, 0) != 0) 893 continue; 894 895 if (nvlist_lookup_uint64(*config, ZPOOL_CONFIG_POOL_STATE, 896 &state) != 0 || state > POOL_STATE_L2CACHE) { 897 nvlist_free(*config); 898 continue; 899 } 900 901 if (state != POOL_STATE_SPARE && state != POOL_STATE_L2CACHE && 902 (nvlist_lookup_uint64(*config, ZPOOL_CONFIG_POOL_TXG, 903 &txg) != 0 || txg == 0)) { 904 nvlist_free(*config); 905 continue; 906 } 907 908 free(label); 909 return (0); 910 } 911 912 free(label); 913 *config = NULL; 914 errno = ENOENT; 915 return (-1); 916} 917 918typedef struct rdsk_node { 919 char *rn_name; 920 int rn_dfd; 921 libzfs_handle_t *rn_hdl; 922 nvlist_t *rn_config; 923 avl_tree_t *rn_avl; 924 avl_node_t rn_node; 925 boolean_t rn_nozpool; 926} rdsk_node_t; 927 928static int 929slice_cache_compare(const void *arg1, const void *arg2) 930{ 931 const char *nm1 = ((rdsk_node_t *)arg1)->rn_name; 932 const char *nm2 = ((rdsk_node_t *)arg2)->rn_name; 933 char *nm1slice, *nm2slice; 934 int rv; 935 936 /* 937 * slices zero and two are the most likely to provide results, 938 * so put those first 939 */ 940 nm1slice = strstr(nm1, "s0"); 941 nm2slice = strstr(nm2, "s0"); 942 if (nm1slice && !nm2slice) { 943 return (-1); 944 } 945 if (!nm1slice && nm2slice) { 946 return (1); 947 } 948 nm1slice = strstr(nm1, "s2"); 949 nm2slice = strstr(nm2, "s2"); 950 if (nm1slice && !nm2slice) { 951 return (-1); 952 } 953 if (!nm1slice && nm2slice) { 954 return (1); 955 } 956 957 rv = strcmp(nm1, nm2); 958 if (rv == 0) 959 return (0); 960 return (rv > 0 ? 1 : -1); 961} 962 963#ifdef illumos 964static void 965check_one_slice(avl_tree_t *r, char *diskname, uint_t partno, 966 diskaddr_t size, uint_t blksz) 967{ 968 rdsk_node_t tmpnode; 969 rdsk_node_t *node; 970 char sname[MAXNAMELEN]; 971 972 tmpnode.rn_name = &sname[0]; 973 (void) snprintf(tmpnode.rn_name, MAXNAMELEN, "%s%u", 974 diskname, partno); 975 /* 976 * protect against division by zero for disk labels that 977 * contain a bogus sector size 978 */ 979 if (blksz == 0) 980 blksz = DEV_BSIZE; 981 /* too small to contain a zpool? */ 982 if ((size < (SPA_MINDEVSIZE / blksz)) && 983 (node = avl_find(r, &tmpnode, NULL))) 984 node->rn_nozpool = B_TRUE; 985} 986#endif /* illumos */ 987 988static void 989nozpool_all_slices(avl_tree_t *r, const char *sname) 990{ 991#ifdef illumos 992 char diskname[MAXNAMELEN]; 993 char *ptr; 994 int i; 995 996 (void) strncpy(diskname, sname, MAXNAMELEN); 997 if (((ptr = strrchr(diskname, 's')) == NULL) && 998 ((ptr = strrchr(diskname, 'p')) == NULL)) 999 return; 1000 ptr[0] = 's'; 1001 ptr[1] = '\0'; 1002 for (i = 0; i < NDKMAP; i++) 1003 check_one_slice(r, diskname, i, 0, 1); 1004 ptr[0] = 'p'; 1005 for (i = 0; i <= FD_NUMPART; i++) 1006 check_one_slice(r, diskname, i, 0, 1); 1007#endif /* illumos */ 1008} 1009 1010#ifdef illumos 1011static void 1012check_slices(avl_tree_t *r, int fd, const char *sname) 1013{ 1014 struct extvtoc vtoc; 1015 struct dk_gpt *gpt; 1016 char diskname[MAXNAMELEN]; 1017 char *ptr; 1018 int i; 1019 1020 (void) strncpy(diskname, sname, MAXNAMELEN); 1021 if ((ptr = strrchr(diskname, 's')) == NULL || !isdigit(ptr[1])) 1022 return; 1023 ptr[1] = '\0'; 1024 1025 if (read_extvtoc(fd, &vtoc) >= 0) { 1026 for (i = 0; i < NDKMAP; i++) 1027 check_one_slice(r, diskname, i, 1028 vtoc.v_part[i].p_size, vtoc.v_sectorsz); 1029 } else if (efi_alloc_and_read(fd, &gpt) >= 0) { 1030 /* 1031 * on x86 we'll still have leftover links that point 1032 * to slices s[9-15], so use NDKMAP instead 1033 */ 1034 for (i = 0; i < NDKMAP; i++) 1035 check_one_slice(r, diskname, i, 1036 gpt->efi_parts[i].p_size, gpt->efi_lbasize); 1037 /* nodes p[1-4] are never used with EFI labels */ 1038 ptr[0] = 'p'; 1039 for (i = 1; i <= FD_NUMPART; i++) 1040 check_one_slice(r, diskname, i, 0, 1); 1041 efi_free(gpt); 1042 } 1043} 1044#endif /* illumos */ 1045 1046static void 1047zpool_open_func(void *arg) 1048{ 1049 rdsk_node_t *rn = arg; 1050 struct stat64 statbuf; 1051 nvlist_t *config; 1052 int fd; 1053 1054 if (rn->rn_nozpool) 1055 return; 1056 if ((fd = openat64(rn->rn_dfd, rn->rn_name, O_RDONLY)) < 0) { 1057 /* symlink to a device that's no longer there */ 1058 if (errno == ENOENT) 1059 nozpool_all_slices(rn->rn_avl, rn->rn_name); 1060 return; 1061 } 1062 /* 1063 * Ignore failed stats. We only want regular 1064 * files, character devs and block devs. 1065 */ 1066 if (fstat64(fd, &statbuf) != 0 || 1067 (!S_ISREG(statbuf.st_mode) && 1068 !S_ISCHR(statbuf.st_mode) && 1069 !S_ISBLK(statbuf.st_mode))) { 1070 (void) close(fd); 1071 return; 1072 } 1073 /* this file is too small to hold a zpool */ 1074#ifdef illumos 1075 if (S_ISREG(statbuf.st_mode) && 1076 statbuf.st_size < SPA_MINDEVSIZE) { 1077 (void) close(fd); 1078 return; 1079 } else if (!S_ISREG(statbuf.st_mode)) { 1080 /* 1081 * Try to read the disk label first so we don't have to 1082 * open a bunch of minor nodes that can't have a zpool. 1083 */ 1084 check_slices(rn->rn_avl, fd, rn->rn_name); 1085 } 1086#else /* !illumos */ 1087 if (statbuf.st_size < SPA_MINDEVSIZE) { 1088 (void) close(fd); 1089 return; 1090 } 1091#endif /* illumos */ 1092 1093 if ((zpool_read_label(fd, &config)) != 0 && errno == ENOMEM) { 1094 (void) close(fd); 1095 (void) no_memory(rn->rn_hdl); 1096 return; 1097 } 1098 (void) close(fd); 1099 1100 rn->rn_config = config; 1101} 1102 1103/* 1104 * Given a file descriptor, clear (zero) the label information. 1105 */ 1106int 1107zpool_clear_label(int fd) 1108{ 1109 struct stat64 statbuf; 1110 int l; 1111 vdev_label_t *label; 1112 uint64_t size; 1113 1114 if (fstat64(fd, &statbuf) == -1) 1115 return (0); 1116 size = P2ALIGN_TYPED(statbuf.st_size, sizeof (vdev_label_t), uint64_t); 1117 1118 if ((label = calloc(sizeof (vdev_label_t), 1)) == NULL) 1119 return (-1); 1120 1121 for (l = 0; l < VDEV_LABELS; l++) { 1122 if (pwrite64(fd, label, sizeof (vdev_label_t), 1123 label_offset(size, l)) != sizeof (vdev_label_t)) { 1124 free(label); 1125 return (-1); 1126 } 1127 } 1128 1129 free(label); 1130 return (0); 1131} 1132 1133/* 1134 * Given a list of directories to search, find all pools stored on disk. This 1135 * includes partial pools which are not available to import. If no args are 1136 * given (argc is 0), then the default directory (/dev/dsk) is searched. 1137 * poolname or guid (but not both) are provided by the caller when trying 1138 * to import a specific pool. 1139 */ 1140static nvlist_t * 1141zpool_find_import_impl(libzfs_handle_t *hdl, importargs_t *iarg) 1142{ 1143 int i, dirs = iarg->paths; 1144 struct dirent64 *dp; 1145 char path[MAXPATHLEN]; 1146 char *end, **dir = iarg->path; 1147 size_t pathleft; 1148 nvlist_t *ret = NULL; 1149 static char *default_dir = "/dev"; 1150 pool_list_t pools = { 0 }; 1151 pool_entry_t *pe, *penext; 1152 vdev_entry_t *ve, *venext; 1153 config_entry_t *ce, *cenext; 1154 name_entry_t *ne, *nenext; 1155 avl_tree_t slice_cache; 1156 rdsk_node_t *slice; 1157 void *cookie; 1158 1159 if (dirs == 0) { 1160 dirs = 1; 1161 dir = &default_dir; 1162 } 1163 1164 /* 1165 * Go through and read the label configuration information from every 1166 * possible device, organizing the information according to pool GUID 1167 * and toplevel GUID. 1168 */ 1169 for (i = 0; i < dirs; i++) { 1170 tpool_t *t; 1171 char rdsk[MAXPATHLEN]; 1172 int dfd; 1173 boolean_t config_failed = B_FALSE; 1174 DIR *dirp; 1175 1176 /* use realpath to normalize the path */ 1177 if (realpath(dir[i], path) == 0) { 1178 (void) zfs_error_fmt(hdl, EZFS_BADPATH, 1179 dgettext(TEXT_DOMAIN, "cannot open '%s'"), dir[i]); 1180 goto error; 1181 } 1182 end = &path[strlen(path)]; 1183 *end++ = '/'; 1184 *end = 0; 1185 pathleft = &path[sizeof (path)] - end; 1186 1187#ifdef illumos 1188 /* 1189 * Using raw devices instead of block devices when we're 1190 * reading the labels skips a bunch of slow operations during 1191 * close(2) processing, so we replace /dev/dsk with /dev/rdsk. 1192 */ 1193 if (strcmp(path, ZFS_DISK_ROOTD) == 0) 1194 (void) strlcpy(rdsk, ZFS_RDISK_ROOTD, sizeof (rdsk)); 1195 else 1196#endif 1197 (void) strlcpy(rdsk, path, sizeof (rdsk)); 1198 1199 if ((dfd = open64(rdsk, O_RDONLY)) < 0 || 1200 (dirp = fdopendir(dfd)) == NULL) { 1201 if (dfd >= 0) 1202 (void) close(dfd); 1203 zfs_error_aux(hdl, strerror(errno)); 1204 (void) zfs_error_fmt(hdl, EZFS_BADPATH, 1205 dgettext(TEXT_DOMAIN, "cannot open '%s'"), 1206 rdsk); 1207 goto error; 1208 } 1209 1210 avl_create(&slice_cache, slice_cache_compare, 1211 sizeof (rdsk_node_t), offsetof(rdsk_node_t, rn_node)); 1212 1213 if (strcmp(rdsk, "/dev/") == 0) { 1214 struct gmesh mesh; 1215 struct gclass *mp; 1216 struct ggeom *gp; 1217 struct gprovider *pp; 1218 1219 errno = geom_gettree(&mesh); 1220 if (errno != 0) { 1221 zfs_error_aux(hdl, strerror(errno)); 1222 (void) zfs_error_fmt(hdl, EZFS_BADPATH, 1223 dgettext(TEXT_DOMAIN, "cannot get GEOM tree")); 1224 goto error; 1225 } 1226 1227 LIST_FOREACH(mp, &mesh.lg_class, lg_class) { 1228 LIST_FOREACH(gp, &mp->lg_geom, lg_geom) { 1229 LIST_FOREACH(pp, &gp->lg_provider, lg_provider) { 1230 slice = zfs_alloc(hdl, sizeof (rdsk_node_t)); 1231 slice->rn_name = zfs_strdup(hdl, pp->lg_name); 1232 slice->rn_avl = &slice_cache; 1233 slice->rn_dfd = dfd; 1234 slice->rn_hdl = hdl; 1235 slice->rn_nozpool = B_FALSE; 1236 avl_add(&slice_cache, slice); 1237 } 1238 } 1239 } 1240 1241 geom_deletetree(&mesh); 1242 goto skipdir; 1243 } 1244 1245 /* 1246 * This is not MT-safe, but we have no MT consumers of libzfs 1247 */ 1248 while ((dp = readdir64(dirp)) != NULL) { 1249 const char *name = dp->d_name; 1250 if (name[0] == '.' && 1251 (name[1] == 0 || (name[1] == '.' && name[2] == 0))) 1252 continue; 1253 1254 slice = zfs_alloc(hdl, sizeof (rdsk_node_t)); 1255 slice->rn_name = zfs_strdup(hdl, name); 1256 slice->rn_avl = &slice_cache; 1257 slice->rn_dfd = dfd; 1258 slice->rn_hdl = hdl; 1259 slice->rn_nozpool = B_FALSE; 1260 avl_add(&slice_cache, slice); 1261 } 1262skipdir: 1263 /* 1264 * create a thread pool to do all of this in parallel; 1265 * rn_nozpool is not protected, so this is racy in that 1266 * multiple tasks could decide that the same slice can 1267 * not hold a zpool, which is benign. Also choose 1268 * double the number of processors; we hold a lot of 1269 * locks in the kernel, so going beyond this doesn't 1270 * buy us much. 1271 */ 1272 t = tpool_create(1, 2 * sysconf(_SC_NPROCESSORS_ONLN), 1273 0, NULL); 1274 for (slice = avl_first(&slice_cache); slice; 1275 (slice = avl_walk(&slice_cache, slice, 1276 AVL_AFTER))) 1277 (void) tpool_dispatch(t, zpool_open_func, slice); 1278 tpool_wait(t); 1279 tpool_destroy(t); 1280 1281 cookie = NULL; 1282 while ((slice = avl_destroy_nodes(&slice_cache, 1283 &cookie)) != NULL) { 1284 if (slice->rn_config != NULL && !config_failed) { 1285 nvlist_t *config = slice->rn_config; 1286 boolean_t matched = B_TRUE; 1287 1288 if (iarg->poolname != NULL) { 1289 char *pname; 1290 1291 matched = nvlist_lookup_string(config, 1292 ZPOOL_CONFIG_POOL_NAME, 1293 &pname) == 0 && 1294 strcmp(iarg->poolname, pname) == 0; 1295 } else if (iarg->guid != 0) { 1296 uint64_t this_guid; 1297 1298 matched = nvlist_lookup_uint64(config, 1299 ZPOOL_CONFIG_POOL_GUID, 1300 &this_guid) == 0 && 1301 iarg->guid == this_guid; 1302 } 1303 if (!matched) { 1304 nvlist_free(config); 1305 } else { 1306 /* 1307 * use the non-raw path for the config 1308 */ 1309 (void) strlcpy(end, slice->rn_name, 1310 pathleft); 1311 if (add_config(hdl, &pools, path, 1312 config) != 0) 1313 config_failed = B_TRUE; 1314 } 1315 } 1316 free(slice->rn_name); 1317 free(slice); 1318 } 1319 avl_destroy(&slice_cache); 1320 1321 (void) closedir(dirp); 1322 1323 if (config_failed) 1324 goto error; 1325 } 1326 1327 ret = get_configs(hdl, &pools, iarg->can_be_active); 1328 1329error: 1330 for (pe = pools.pools; pe != NULL; pe = penext) { 1331 penext = pe->pe_next; 1332 for (ve = pe->pe_vdevs; ve != NULL; ve = venext) { 1333 venext = ve->ve_next; 1334 for (ce = ve->ve_configs; ce != NULL; ce = cenext) { 1335 cenext = ce->ce_next; 1336 nvlist_free(ce->ce_config); 1337 free(ce); 1338 } 1339 free(ve); 1340 } 1341 free(pe); 1342 } 1343 1344 for (ne = pools.names; ne != NULL; ne = nenext) { 1345 nenext = ne->ne_next; 1346 free(ne->ne_name); 1347 free(ne); 1348 } 1349 1350 return (ret); 1351} 1352 1353nvlist_t * 1354zpool_find_import(libzfs_handle_t *hdl, int argc, char **argv) 1355{ 1356 importargs_t iarg = { 0 }; 1357 1358 iarg.paths = argc; 1359 iarg.path = argv; 1360 1361 return (zpool_find_import_impl(hdl, &iarg)); 1362} 1363 1364/* 1365 * Given a cache file, return the contents as a list of importable pools. 1366 * poolname or guid (but not both) are provided by the caller when trying 1367 * to import a specific pool. 1368 */ 1369nvlist_t * 1370zpool_find_import_cached(libzfs_handle_t *hdl, const char *cachefile, 1371 char *poolname, uint64_t guid) 1372{ 1373 char *buf; 1374 int fd; 1375 struct stat64 statbuf; 1376 nvlist_t *raw, *src, *dst; 1377 nvlist_t *pools; 1378 nvpair_t *elem; 1379 char *name; 1380 uint64_t this_guid; 1381 boolean_t active; 1382 1383 verify(poolname == NULL || guid == 0); 1384 1385 if ((fd = open(cachefile, O_RDONLY)) < 0) { 1386 zfs_error_aux(hdl, "%s", strerror(errno)); 1387 (void) zfs_error(hdl, EZFS_BADCACHE, 1388 dgettext(TEXT_DOMAIN, "failed to open cache file")); 1389 return (NULL); 1390 } 1391 1392 if (fstat64(fd, &statbuf) != 0) { 1393 zfs_error_aux(hdl, "%s", strerror(errno)); 1394 (void) close(fd); 1395 (void) zfs_error(hdl, EZFS_BADCACHE, 1396 dgettext(TEXT_DOMAIN, "failed to get size of cache file")); 1397 return (NULL); 1398 } 1399 1400 if ((buf = zfs_alloc(hdl, statbuf.st_size)) == NULL) { 1401 (void) close(fd); 1402 return (NULL); 1403 } 1404 1405 if (read(fd, buf, statbuf.st_size) != statbuf.st_size) { 1406 (void) close(fd); 1407 free(buf); 1408 (void) zfs_error(hdl, EZFS_BADCACHE, 1409 dgettext(TEXT_DOMAIN, 1410 "failed to read cache file contents")); 1411 return (NULL); 1412 } 1413 1414 (void) close(fd); 1415 1416 if (nvlist_unpack(buf, statbuf.st_size, &raw, 0) != 0) { 1417 free(buf); 1418 (void) zfs_error(hdl, EZFS_BADCACHE, 1419 dgettext(TEXT_DOMAIN, 1420 "invalid or corrupt cache file contents")); 1421 return (NULL); 1422 } 1423 1424 free(buf); 1425 1426 /* 1427 * Go through and get the current state of the pools and refresh their 1428 * state. 1429 */ 1430 if (nvlist_alloc(&pools, 0, 0) != 0) { 1431 (void) no_memory(hdl); 1432 nvlist_free(raw); 1433 return (NULL); 1434 } 1435 1436 elem = NULL; 1437 while ((elem = nvlist_next_nvpair(raw, elem)) != NULL) { 1438 src = fnvpair_value_nvlist(elem); 1439 1440 name = fnvlist_lookup_string(src, ZPOOL_CONFIG_POOL_NAME); 1441 if (poolname != NULL && strcmp(poolname, name) != 0) 1442 continue; 1443 1444 this_guid = fnvlist_lookup_uint64(src, ZPOOL_CONFIG_POOL_GUID); 1445 if (guid != 0 && guid != this_guid) 1446 continue; 1447 1448 if (pool_active(hdl, name, this_guid, &active) != 0) { 1449 nvlist_free(raw); 1450 nvlist_free(pools); 1451 return (NULL); 1452 } 1453 1454 if (active) 1455 continue; 1456 1457 if ((dst = refresh_config(hdl, src)) == NULL) { 1458 nvlist_free(raw); 1459 nvlist_free(pools); 1460 return (NULL); 1461 } 1462 1463 if (nvlist_add_nvlist(pools, nvpair_name(elem), dst) != 0) { 1464 (void) no_memory(hdl); 1465 nvlist_free(dst); 1466 nvlist_free(raw); 1467 nvlist_free(pools); 1468 return (NULL); 1469 } 1470 nvlist_free(dst); 1471 } 1472 1473 nvlist_free(raw); 1474 return (pools); 1475} 1476 1477static int 1478name_or_guid_exists(zpool_handle_t *zhp, void *data) 1479{ 1480 importargs_t *import = data; 1481 int found = 0; 1482 1483 if (import->poolname != NULL) { 1484 char *pool_name; 1485 1486 verify(nvlist_lookup_string(zhp->zpool_config, 1487 ZPOOL_CONFIG_POOL_NAME, &pool_name) == 0); 1488 if (strcmp(pool_name, import->poolname) == 0) 1489 found = 1; 1490 } else { 1491 uint64_t pool_guid; 1492 1493 verify(nvlist_lookup_uint64(zhp->zpool_config, 1494 ZPOOL_CONFIG_POOL_GUID, &pool_guid) == 0); 1495 if (pool_guid == import->guid) 1496 found = 1; 1497 } 1498 1499 zpool_close(zhp); 1500 return (found); 1501} 1502 1503nvlist_t * 1504zpool_search_import(libzfs_handle_t *hdl, importargs_t *import) 1505{ 1506 verify(import->poolname == NULL || import->guid == 0); 1507 1508 if (import->unique) 1509 import->exists = zpool_iter(hdl, name_or_guid_exists, import); 1510 1511 if (import->cachefile != NULL) 1512 return (zpool_find_import_cached(hdl, import->cachefile, 1513 import->poolname, import->guid)); 1514 1515 return (zpool_find_import_impl(hdl, import)); 1516} 1517 1518boolean_t 1519find_guid(nvlist_t *nv, uint64_t guid) 1520{ 1521 uint64_t tmp; 1522 nvlist_t **child; 1523 uint_t c, children; 1524 1525 verify(nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID, &tmp) == 0); 1526 if (tmp == guid) 1527 return (B_TRUE); 1528 1529 if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_CHILDREN, 1530 &child, &children) == 0) { 1531 for (c = 0; c < children; c++) 1532 if (find_guid(child[c], guid)) 1533 return (B_TRUE); 1534 } 1535 1536 return (B_FALSE); 1537} 1538 1539typedef struct aux_cbdata { 1540 const char *cb_type; 1541 uint64_t cb_guid; 1542 zpool_handle_t *cb_zhp; 1543} aux_cbdata_t; 1544 1545static int 1546find_aux(zpool_handle_t *zhp, void *data) 1547{ 1548 aux_cbdata_t *cbp = data; 1549 nvlist_t **list; 1550 uint_t i, count; 1551 uint64_t guid; 1552 nvlist_t *nvroot; 1553 1554 verify(nvlist_lookup_nvlist(zhp->zpool_config, ZPOOL_CONFIG_VDEV_TREE, 1555 &nvroot) == 0); 1556 1557 if (nvlist_lookup_nvlist_array(nvroot, cbp->cb_type, 1558 &list, &count) == 0) { 1559 for (i = 0; i < count; i++) { 1560 verify(nvlist_lookup_uint64(list[i], 1561 ZPOOL_CONFIG_GUID, &guid) == 0); 1562 if (guid == cbp->cb_guid) { 1563 cbp->cb_zhp = zhp; 1564 return (1); 1565 } 1566 } 1567 } 1568 1569 zpool_close(zhp); 1570 return (0); 1571} 1572 1573/* 1574 * Determines if the pool is in use. If so, it returns true and the state of 1575 * the pool as well as the name of the pool. Both strings are allocated and 1576 * must be freed by the caller. 1577 */ 1578int 1579zpool_in_use(libzfs_handle_t *hdl, int fd, pool_state_t *state, char **namestr, 1580 boolean_t *inuse) 1581{ 1582 nvlist_t *config; 1583 char *name; 1584 boolean_t ret; 1585 uint64_t guid, vdev_guid; 1586 zpool_handle_t *zhp; 1587 nvlist_t *pool_config; 1588 uint64_t stateval, isspare; 1589 aux_cbdata_t cb = { 0 }; 1590 boolean_t isactive; 1591 1592 *inuse = B_FALSE; 1593 1594 if (zpool_read_label(fd, &config) != 0 && errno == ENOMEM) { 1595 (void) no_memory(hdl); 1596 return (-1); 1597 } 1598 1599 if (config == NULL) 1600 return (0); 1601 1602 verify(nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_STATE, 1603 &stateval) == 0); 1604 verify(nvlist_lookup_uint64(config, ZPOOL_CONFIG_GUID, 1605 &vdev_guid) == 0); 1606 1607 if (stateval != POOL_STATE_SPARE && stateval != POOL_STATE_L2CACHE) { 1608 verify(nvlist_lookup_string(config, ZPOOL_CONFIG_POOL_NAME, 1609 &name) == 0); 1610 verify(nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_GUID, 1611 &guid) == 0); 1612 } 1613 1614 switch (stateval) { 1615 case POOL_STATE_EXPORTED: 1616 /* 1617 * A pool with an exported state may in fact be imported 1618 * read-only, so check the in-core state to see if it's 1619 * active and imported read-only. If it is, set 1620 * its state to active. 1621 */ 1622 if (pool_active(hdl, name, guid, &isactive) == 0 && isactive && 1623 (zhp = zpool_open_canfail(hdl, name)) != NULL) { 1624 if (zpool_get_prop_int(zhp, ZPOOL_PROP_READONLY, NULL)) 1625 stateval = POOL_STATE_ACTIVE; 1626 1627 /* 1628 * All we needed the zpool handle for is the 1629 * readonly prop check. 1630 */ 1631 zpool_close(zhp); 1632 } 1633 1634 ret = B_TRUE; 1635 break; 1636 1637 case POOL_STATE_ACTIVE: 1638 /* 1639 * For an active pool, we have to determine if it's really part 1640 * of a currently active pool (in which case the pool will exist 1641 * and the guid will be the same), or whether it's part of an 1642 * active pool that was disconnected without being explicitly 1643 * exported. 1644 */ 1645 if (pool_active(hdl, name, guid, &isactive) != 0) { 1646 nvlist_free(config); 1647 return (-1); 1648 } 1649 1650 if (isactive) { 1651 /* 1652 * Because the device may have been removed while 1653 * offlined, we only report it as active if the vdev is 1654 * still present in the config. Otherwise, pretend like 1655 * it's not in use. 1656 */ 1657 if ((zhp = zpool_open_canfail(hdl, name)) != NULL && 1658 (pool_config = zpool_get_config(zhp, NULL)) 1659 != NULL) { 1660 nvlist_t *nvroot; 1661 1662 verify(nvlist_lookup_nvlist(pool_config, 1663 ZPOOL_CONFIG_VDEV_TREE, &nvroot) == 0); 1664 ret = find_guid(nvroot, vdev_guid); 1665 } else { 1666 ret = B_FALSE; 1667 } 1668 1669 /* 1670 * If this is an active spare within another pool, we 1671 * treat it like an unused hot spare. This allows the 1672 * user to create a pool with a hot spare that currently 1673 * in use within another pool. Since we return B_TRUE, 1674 * libdiskmgt will continue to prevent generic consumers 1675 * from using the device. 1676 */ 1677 if (ret && nvlist_lookup_uint64(config, 1678 ZPOOL_CONFIG_IS_SPARE, &isspare) == 0 && isspare) 1679 stateval = POOL_STATE_SPARE; 1680 1681 if (zhp != NULL) 1682 zpool_close(zhp); 1683 } else { 1684 stateval = POOL_STATE_POTENTIALLY_ACTIVE; 1685 ret = B_TRUE; 1686 } 1687 break; 1688 1689 case POOL_STATE_SPARE: 1690 /* 1691 * For a hot spare, it can be either definitively in use, or 1692 * potentially active. To determine if it's in use, we iterate 1693 * over all pools in the system and search for one with a spare 1694 * with a matching guid. 1695 * 1696 * Due to the shared nature of spares, we don't actually report 1697 * the potentially active case as in use. This means the user 1698 * can freely create pools on the hot spares of exported pools, 1699 * but to do otherwise makes the resulting code complicated, and 1700 * we end up having to deal with this case anyway. 1701 */ 1702 cb.cb_zhp = NULL; 1703 cb.cb_guid = vdev_guid; 1704 cb.cb_type = ZPOOL_CONFIG_SPARES; 1705 if (zpool_iter(hdl, find_aux, &cb) == 1) { 1706 name = (char *)zpool_get_name(cb.cb_zhp); 1707 ret = B_TRUE; 1708 } else { 1709 ret = B_FALSE; 1710 } 1711 break; 1712 1713 case POOL_STATE_L2CACHE: 1714 1715 /* 1716 * Check if any pool is currently using this l2cache device. 1717 */ 1718 cb.cb_zhp = NULL; 1719 cb.cb_guid = vdev_guid; 1720 cb.cb_type = ZPOOL_CONFIG_L2CACHE; 1721 if (zpool_iter(hdl, find_aux, &cb) == 1) { 1722 name = (char *)zpool_get_name(cb.cb_zhp); 1723 ret = B_TRUE; 1724 } else { 1725 ret = B_FALSE; 1726 } 1727 break; 1728 1729 default: 1730 ret = B_FALSE; 1731 } 1732 1733 1734 if (ret) { 1735 if ((*namestr = zfs_strdup(hdl, name)) == NULL) { 1736 if (cb.cb_zhp) 1737 zpool_close(cb.cb_zhp); 1738 nvlist_free(config); 1739 return (-1); 1740 } 1741 *state = (pool_state_t)stateval; 1742 } 1743 1744 if (cb.cb_zhp) 1745 zpool_close(cb.cb_zhp); 1746 1747 nvlist_free(config); 1748 *inuse = ret; 1749 return (0); 1750} 1751