libzfs_import.c revision 235479
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 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 23 * Copyright 2011 Nexenta Systems, Inc. All rights reserved. 24 * Copyright (c) 2011 by Delphix. All rights reserved. 25 */ 26 27/* 28 * Pool import support functions. 29 * 30 * To import a pool, we rely on reading the configuration information from the 31 * ZFS label of each device. If we successfully read the label, then we 32 * organize the configuration information in the following hierarchy: 33 * 34 * pool guid -> toplevel vdev guid -> label txg 35 * 36 * Duplicate entries matching this same tuple will be discarded. Once we have 37 * examined every device, we pick the best label txg config for each toplevel 38 * vdev. We then arrange these toplevel vdevs into a complete pool config, and 39 * update any paths that have changed. Finally, we attempt to import the pool 40 * using our derived config, and record the results. 41 */ 42 43#include <ctype.h> 44#include <devid.h> 45#include <dirent.h> 46#include <errno.h> 47#include <libintl.h> 48#include <stddef.h> 49#include <stdlib.h> 50#include <string.h> 51#include <sys/stat.h> 52#include <unistd.h> 53#include <fcntl.h> 54#include <thread_pool.h> 55#include <libgeom.h> 56 57#include <sys/vdev_impl.h> 58 59#include "libzfs.h" 60#include "libzfs_impl.h" 61 62/* 63 * Intermediate structures used to gather configuration information. 64 */ 65typedef struct config_entry { 66 uint64_t ce_txg; 67 nvlist_t *ce_config; 68 struct config_entry *ce_next; 69} config_entry_t; 70 71typedef struct vdev_entry { 72 uint64_t ve_guid; 73 config_entry_t *ve_configs; 74 struct vdev_entry *ve_next; 75} vdev_entry_t; 76 77typedef struct pool_entry { 78 uint64_t pe_guid; 79 vdev_entry_t *pe_vdevs; 80 struct pool_entry *pe_next; 81} pool_entry_t; 82 83typedef struct name_entry { 84 char *ne_name; 85 uint64_t ne_guid; 86 struct name_entry *ne_next; 87} name_entry_t; 88 89typedef struct pool_list { 90 pool_entry_t *pools; 91 name_entry_t *names; 92} pool_list_t; 93 94static char * 95get_devid(const char *path) 96{ 97 int fd; 98 ddi_devid_t devid; 99 char *minor, *ret; 100 101 if ((fd = open(path, O_RDONLY)) < 0) 102 return (NULL); 103 104 minor = NULL; 105 ret = NULL; 106 if (devid_get(fd, &devid) == 0) { 107 if (devid_get_minor_name(fd, &minor) == 0) 108 ret = devid_str_encode(devid, minor); 109 if (minor != NULL) 110 devid_str_free(minor); 111 devid_free(devid); 112 } 113 (void) close(fd); 114 115 return (ret); 116} 117 118 119/* 120 * Go through and fix up any path and/or devid information for the given vdev 121 * configuration. 122 */ 123static int 124fix_paths(nvlist_t *nv, name_entry_t *names) 125{ 126 nvlist_t **child; 127 uint_t c, children; 128 uint64_t guid; 129 name_entry_t *ne, *best; 130 char *path, *devid; 131 int matched; 132 133 if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_CHILDREN, 134 &child, &children) == 0) { 135 for (c = 0; c < children; c++) 136 if (fix_paths(child[c], names) != 0) 137 return (-1); 138 return (0); 139 } 140 141 /* 142 * This is a leaf (file or disk) vdev. In either case, go through 143 * the name list and see if we find a matching guid. If so, replace 144 * the path and see if we can calculate a new devid. 145 * 146 * There may be multiple names associated with a particular guid, in 147 * which case we have overlapping slices or multiple paths to the same 148 * disk. If this is the case, then we want to pick the path that is 149 * the most similar to the original, where "most similar" is the number 150 * of matching characters starting from the end of the path. This will 151 * preserve slice numbers even if the disks have been reorganized, and 152 * will also catch preferred disk names if multiple paths exist. 153 */ 154 verify(nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID, &guid) == 0); 155 if (nvlist_lookup_string(nv, ZPOOL_CONFIG_PATH, &path) != 0) 156 path = NULL; 157 158 matched = 0; 159 best = NULL; 160 for (ne = names; ne != NULL; ne = ne->ne_next) { 161 if (ne->ne_guid == guid) { 162 const char *src, *dst; 163 int count; 164 165 if (path == NULL) { 166 best = ne; 167 break; 168 } 169 170 src = ne->ne_name + strlen(ne->ne_name) - 1; 171 dst = path + strlen(path) - 1; 172 for (count = 0; src >= ne->ne_name && dst >= path; 173 src--, dst--, count++) 174 if (*src != *dst) 175 break; 176 177 /* 178 * At this point, 'count' is the number of characters 179 * matched from the end. 180 */ 181 if (count > matched || best == NULL) { 182 best = ne; 183 matched = count; 184 } 185 } 186 } 187 188 if (best == NULL) 189 return (0); 190 191 if (nvlist_add_string(nv, ZPOOL_CONFIG_PATH, best->ne_name) != 0) 192 return (-1); 193 194 if ((devid = get_devid(best->ne_name)) == NULL) { 195 (void) nvlist_remove_all(nv, ZPOOL_CONFIG_DEVID); 196 } else { 197 if (nvlist_add_string(nv, ZPOOL_CONFIG_DEVID, devid) != 0) 198 return (-1); 199 devid_str_free(devid); 200 } 201 202 return (0); 203} 204 205/* 206 * Add the given configuration to the list of known devices. 207 */ 208static int 209add_config(libzfs_handle_t *hdl, pool_list_t *pl, const char *path, 210 nvlist_t *config) 211{ 212 uint64_t pool_guid, vdev_guid, top_guid, txg, state; 213 pool_entry_t *pe; 214 vdev_entry_t *ve; 215 config_entry_t *ce; 216 name_entry_t *ne; 217 218 /* 219 * If this is a hot spare not currently in use or level 2 cache 220 * device, add it to the list of names to translate, but don't do 221 * anything else. 222 */ 223 if (nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_STATE, 224 &state) == 0 && 225 (state == POOL_STATE_SPARE || state == POOL_STATE_L2CACHE) && 226 nvlist_lookup_uint64(config, ZPOOL_CONFIG_GUID, &vdev_guid) == 0) { 227 if ((ne = zfs_alloc(hdl, sizeof (name_entry_t))) == NULL) 228 return (-1); 229 230 if ((ne->ne_name = zfs_strdup(hdl, path)) == NULL) { 231 free(ne); 232 return (-1); 233 } 234 ne->ne_guid = vdev_guid; 235 ne->ne_next = pl->names; 236 pl->names = ne; 237 return (0); 238 } 239 240 /* 241 * If we have a valid config but cannot read any of these fields, then 242 * it means we have a half-initialized label. In vdev_label_init() 243 * we write a label with txg == 0 so that we can identify the device 244 * in case the user refers to the same disk later on. If we fail to 245 * create the pool, we'll be left with a label in this state 246 * which should not be considered part of a valid pool. 247 */ 248 if (nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_GUID, 249 &pool_guid) != 0 || 250 nvlist_lookup_uint64(config, ZPOOL_CONFIG_GUID, 251 &vdev_guid) != 0 || 252 nvlist_lookup_uint64(config, ZPOOL_CONFIG_TOP_GUID, 253 &top_guid) != 0 || 254 nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_TXG, 255 &txg) != 0 || txg == 0) { 256 nvlist_free(config); 257 return (0); 258 } 259 260 /* 261 * First, see if we know about this pool. If not, then add it to the 262 * list of known pools. 263 */ 264 for (pe = pl->pools; pe != NULL; pe = pe->pe_next) { 265 if (pe->pe_guid == pool_guid) 266 break; 267 } 268 269 if (pe == NULL) { 270 if ((pe = zfs_alloc(hdl, sizeof (pool_entry_t))) == NULL) { 271 nvlist_free(config); 272 return (-1); 273 } 274 pe->pe_guid = pool_guid; 275 pe->pe_next = pl->pools; 276 pl->pools = pe; 277 } 278 279 /* 280 * Second, see if we know about this toplevel vdev. Add it if its 281 * missing. 282 */ 283 for (ve = pe->pe_vdevs; ve != NULL; ve = ve->ve_next) { 284 if (ve->ve_guid == top_guid) 285 break; 286 } 287 288 if (ve == NULL) { 289 if ((ve = zfs_alloc(hdl, sizeof (vdev_entry_t))) == NULL) { 290 nvlist_free(config); 291 return (-1); 292 } 293 ve->ve_guid = top_guid; 294 ve->ve_next = pe->pe_vdevs; 295 pe->pe_vdevs = ve; 296 } 297 298 /* 299 * Third, see if we have a config with a matching transaction group. If 300 * so, then we do nothing. Otherwise, add it to the list of known 301 * configs. 302 */ 303 for (ce = ve->ve_configs; ce != NULL; ce = ce->ce_next) { 304 if (ce->ce_txg == txg) 305 break; 306 } 307 308 if (ce == NULL) { 309 if ((ce = zfs_alloc(hdl, sizeof (config_entry_t))) == NULL) { 310 nvlist_free(config); 311 return (-1); 312 } 313 ce->ce_txg = txg; 314 ce->ce_config = config; 315 ce->ce_next = ve->ve_configs; 316 ve->ve_configs = ce; 317 } else { 318 nvlist_free(config); 319 } 320 321 /* 322 * At this point we've successfully added our config to the list of 323 * known configs. The last thing to do is add the vdev guid -> path 324 * mappings so that we can fix up the configuration as necessary before 325 * doing the import. 326 */ 327 if ((ne = zfs_alloc(hdl, sizeof (name_entry_t))) == NULL) 328 return (-1); 329 330 if ((ne->ne_name = zfs_strdup(hdl, path)) == NULL) { 331 free(ne); 332 return (-1); 333 } 334 335 ne->ne_guid = vdev_guid; 336 ne->ne_next = pl->names; 337 pl->names = ne; 338 339 return (0); 340} 341 342/* 343 * Returns true if the named pool matches the given GUID. 344 */ 345static int 346pool_active(libzfs_handle_t *hdl, const char *name, uint64_t guid, 347 boolean_t *isactive) 348{ 349 zpool_handle_t *zhp; 350 uint64_t theguid; 351 352 if (zpool_open_silent(hdl, name, &zhp) != 0) 353 return (-1); 354 355 if (zhp == NULL) { 356 *isactive = B_FALSE; 357 return (0); 358 } 359 360 verify(nvlist_lookup_uint64(zhp->zpool_config, ZPOOL_CONFIG_POOL_GUID, 361 &theguid) == 0); 362 363 zpool_close(zhp); 364 365 *isactive = (theguid == guid); 366 return (0); 367} 368 369static nvlist_t * 370refresh_config(libzfs_handle_t *hdl, nvlist_t *config) 371{ 372 nvlist_t *nvl; 373 zfs_cmd_t zc = { 0 }; 374 int err; 375 376 if (zcmd_write_conf_nvlist(hdl, &zc, config) != 0) 377 return (NULL); 378 379 if (zcmd_alloc_dst_nvlist(hdl, &zc, 380 zc.zc_nvlist_conf_size * 2) != 0) { 381 zcmd_free_nvlists(&zc); 382 return (NULL); 383 } 384 385 while ((err = ioctl(hdl->libzfs_fd, ZFS_IOC_POOL_TRYIMPORT, 386 &zc)) != 0 && errno == ENOMEM) { 387 if (zcmd_expand_dst_nvlist(hdl, &zc) != 0) { 388 zcmd_free_nvlists(&zc); 389 return (NULL); 390 } 391 } 392 393 if (err) { 394 zcmd_free_nvlists(&zc); 395 return (NULL); 396 } 397 398 if (zcmd_read_dst_nvlist(hdl, &zc, &nvl) != 0) { 399 zcmd_free_nvlists(&zc); 400 return (NULL); 401 } 402 403 zcmd_free_nvlists(&zc); 404 return (nvl); 405} 406 407/* 408 * Determine if the vdev id is a hole in the namespace. 409 */ 410boolean_t 411vdev_is_hole(uint64_t *hole_array, uint_t holes, uint_t id) 412{ 413 for (int c = 0; c < holes; c++) { 414 415 /* Top-level is a hole */ 416 if (hole_array[c] == id) 417 return (B_TRUE); 418 } 419 return (B_FALSE); 420} 421 422/* 423 * Convert our list of pools into the definitive set of configurations. We 424 * start by picking the best config for each toplevel vdev. Once that's done, 425 * we assemble the toplevel vdevs into a full config for the pool. We make a 426 * pass to fix up any incorrect paths, and then add it to the main list to 427 * return to the user. 428 */ 429static nvlist_t * 430get_configs(libzfs_handle_t *hdl, pool_list_t *pl, boolean_t active_ok) 431{ 432 pool_entry_t *pe; 433 vdev_entry_t *ve; 434 config_entry_t *ce; 435 nvlist_t *ret = NULL, *config = NULL, *tmp, *nvtop, *nvroot; 436 nvlist_t **spares, **l2cache; 437 uint_t i, nspares, nl2cache; 438 boolean_t config_seen; 439 uint64_t best_txg; 440 char *name, *hostname, *comment; 441 uint64_t version, guid; 442 uint_t children = 0; 443 nvlist_t **child = NULL; 444 uint_t holes; 445 uint64_t *hole_array, max_id; 446 uint_t c; 447 boolean_t isactive; 448 uint64_t hostid; 449 nvlist_t *nvl; 450 boolean_t found_one = B_FALSE; 451 boolean_t valid_top_config = B_FALSE; 452 453 if (nvlist_alloc(&ret, 0, 0) != 0) 454 goto nomem; 455 456 for (pe = pl->pools; pe != NULL; pe = pe->pe_next) { 457 uint64_t id, max_txg = 0; 458 459 if (nvlist_alloc(&config, NV_UNIQUE_NAME, 0) != 0) 460 goto nomem; 461 config_seen = B_FALSE; 462 463 /* 464 * Iterate over all toplevel vdevs. Grab the pool configuration 465 * from the first one we find, and then go through the rest and 466 * add them as necessary to the 'vdevs' member of the config. 467 */ 468 for (ve = pe->pe_vdevs; ve != NULL; ve = ve->ve_next) { 469 470 /* 471 * Determine the best configuration for this vdev by 472 * selecting the config with the latest transaction 473 * group. 474 */ 475 best_txg = 0; 476 for (ce = ve->ve_configs; ce != NULL; 477 ce = ce->ce_next) { 478 479 if (ce->ce_txg > best_txg) { 480 tmp = ce->ce_config; 481 best_txg = ce->ce_txg; 482 } 483 } 484 485 /* 486 * We rely on the fact that the max txg for the 487 * pool will contain the most up-to-date information 488 * about the valid top-levels in the vdev namespace. 489 */ 490 if (best_txg > max_txg) { 491 (void) nvlist_remove(config, 492 ZPOOL_CONFIG_VDEV_CHILDREN, 493 DATA_TYPE_UINT64); 494 (void) nvlist_remove(config, 495 ZPOOL_CONFIG_HOLE_ARRAY, 496 DATA_TYPE_UINT64_ARRAY); 497 498 max_txg = best_txg; 499 hole_array = NULL; 500 holes = 0; 501 max_id = 0; 502 valid_top_config = B_FALSE; 503 504 if (nvlist_lookup_uint64(tmp, 505 ZPOOL_CONFIG_VDEV_CHILDREN, &max_id) == 0) { 506 verify(nvlist_add_uint64(config, 507 ZPOOL_CONFIG_VDEV_CHILDREN, 508 max_id) == 0); 509 valid_top_config = B_TRUE; 510 } 511 512 if (nvlist_lookup_uint64_array(tmp, 513 ZPOOL_CONFIG_HOLE_ARRAY, &hole_array, 514 &holes) == 0) { 515 verify(nvlist_add_uint64_array(config, 516 ZPOOL_CONFIG_HOLE_ARRAY, 517 hole_array, holes) == 0); 518 } 519 } 520 521 if (!config_seen) { 522 /* 523 * Copy the relevant pieces of data to the pool 524 * configuration: 525 * 526 * version 527 * pool guid 528 * name 529 * comment (if available) 530 * pool state 531 * hostid (if available) 532 * hostname (if available) 533 */ 534 uint64_t state; 535 536 verify(nvlist_lookup_uint64(tmp, 537 ZPOOL_CONFIG_VERSION, &version) == 0); 538 if (nvlist_add_uint64(config, 539 ZPOOL_CONFIG_VERSION, version) != 0) 540 goto nomem; 541 verify(nvlist_lookup_uint64(tmp, 542 ZPOOL_CONFIG_POOL_GUID, &guid) == 0); 543 if (nvlist_add_uint64(config, 544 ZPOOL_CONFIG_POOL_GUID, guid) != 0) 545 goto nomem; 546 verify(nvlist_lookup_string(tmp, 547 ZPOOL_CONFIG_POOL_NAME, &name) == 0); 548 if (nvlist_add_string(config, 549 ZPOOL_CONFIG_POOL_NAME, name) != 0) 550 goto nomem; 551 552 /* 553 * COMMENT is optional, don't bail if it's not 554 * there, instead, set it to NULL. 555 */ 556 if (nvlist_lookup_string(tmp, 557 ZPOOL_CONFIG_COMMENT, &comment) != 0) 558 comment = NULL; 559 else if (nvlist_add_string(config, 560 ZPOOL_CONFIG_COMMENT, comment) != 0) 561 goto nomem; 562 563 verify(nvlist_lookup_uint64(tmp, 564 ZPOOL_CONFIG_POOL_STATE, &state) == 0); 565 if (nvlist_add_uint64(config, 566 ZPOOL_CONFIG_POOL_STATE, state) != 0) 567 goto nomem; 568 569 hostid = 0; 570 if (nvlist_lookup_uint64(tmp, 571 ZPOOL_CONFIG_HOSTID, &hostid) == 0) { 572 if (nvlist_add_uint64(config, 573 ZPOOL_CONFIG_HOSTID, hostid) != 0) 574 goto nomem; 575 verify(nvlist_lookup_string(tmp, 576 ZPOOL_CONFIG_HOSTNAME, 577 &hostname) == 0); 578 if (nvlist_add_string(config, 579 ZPOOL_CONFIG_HOSTNAME, 580 hostname) != 0) 581 goto nomem; 582 } 583 584 config_seen = B_TRUE; 585 } 586 587 /* 588 * Add this top-level vdev to the child array. 589 */ 590 verify(nvlist_lookup_nvlist(tmp, 591 ZPOOL_CONFIG_VDEV_TREE, &nvtop) == 0); 592 verify(nvlist_lookup_uint64(nvtop, ZPOOL_CONFIG_ID, 593 &id) == 0); 594 595 if (id >= children) { 596 nvlist_t **newchild; 597 598 newchild = zfs_alloc(hdl, (id + 1) * 599 sizeof (nvlist_t *)); 600 if (newchild == NULL) 601 goto nomem; 602 603 for (c = 0; c < children; c++) 604 newchild[c] = child[c]; 605 606 free(child); 607 child = newchild; 608 children = id + 1; 609 } 610 if (nvlist_dup(nvtop, &child[id], 0) != 0) 611 goto nomem; 612 613 } 614 615 /* 616 * If we have information about all the top-levels then 617 * clean up the nvlist which we've constructed. This 618 * means removing any extraneous devices that are 619 * beyond the valid range or adding devices to the end 620 * of our array which appear to be missing. 621 */ 622 if (valid_top_config) { 623 if (max_id < children) { 624 for (c = max_id; c < children; c++) 625 nvlist_free(child[c]); 626 children = max_id; 627 } else if (max_id > children) { 628 nvlist_t **newchild; 629 630 newchild = zfs_alloc(hdl, (max_id) * 631 sizeof (nvlist_t *)); 632 if (newchild == NULL) 633 goto nomem; 634 635 for (c = 0; c < children; c++) 636 newchild[c] = child[c]; 637 638 free(child); 639 child = newchild; 640 children = max_id; 641 } 642 } 643 644 verify(nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_GUID, 645 &guid) == 0); 646 647 /* 648 * The vdev namespace may contain holes as a result of 649 * device removal. We must add them back into the vdev 650 * tree before we process any missing devices. 651 */ 652 if (holes > 0) { 653 ASSERT(valid_top_config); 654 655 for (c = 0; c < children; c++) { 656 nvlist_t *holey; 657 658 if (child[c] != NULL || 659 !vdev_is_hole(hole_array, holes, c)) 660 continue; 661 662 if (nvlist_alloc(&holey, NV_UNIQUE_NAME, 663 0) != 0) 664 goto nomem; 665 666 /* 667 * Holes in the namespace are treated as 668 * "hole" top-level vdevs and have a 669 * special flag set on them. 670 */ 671 if (nvlist_add_string(holey, 672 ZPOOL_CONFIG_TYPE, 673 VDEV_TYPE_HOLE) != 0 || 674 nvlist_add_uint64(holey, 675 ZPOOL_CONFIG_ID, c) != 0 || 676 nvlist_add_uint64(holey, 677 ZPOOL_CONFIG_GUID, 0ULL) != 0) 678 goto nomem; 679 child[c] = holey; 680 } 681 } 682 683 /* 684 * Look for any missing top-level vdevs. If this is the case, 685 * create a faked up 'missing' vdev as a placeholder. We cannot 686 * simply compress the child array, because the kernel performs 687 * certain checks to make sure the vdev IDs match their location 688 * in the configuration. 689 */ 690 for (c = 0; c < children; c++) { 691 if (child[c] == NULL) { 692 nvlist_t *missing; 693 if (nvlist_alloc(&missing, NV_UNIQUE_NAME, 694 0) != 0) 695 goto nomem; 696 if (nvlist_add_string(missing, 697 ZPOOL_CONFIG_TYPE, 698 VDEV_TYPE_MISSING) != 0 || 699 nvlist_add_uint64(missing, 700 ZPOOL_CONFIG_ID, c) != 0 || 701 nvlist_add_uint64(missing, 702 ZPOOL_CONFIG_GUID, 0ULL) != 0) { 703 nvlist_free(missing); 704 goto nomem; 705 } 706 child[c] = missing; 707 } 708 } 709 710 /* 711 * Put all of this pool's top-level vdevs into a root vdev. 712 */ 713 if (nvlist_alloc(&nvroot, NV_UNIQUE_NAME, 0) != 0) 714 goto nomem; 715 if (nvlist_add_string(nvroot, ZPOOL_CONFIG_TYPE, 716 VDEV_TYPE_ROOT) != 0 || 717 nvlist_add_uint64(nvroot, ZPOOL_CONFIG_ID, 0ULL) != 0 || 718 nvlist_add_uint64(nvroot, ZPOOL_CONFIG_GUID, guid) != 0 || 719 nvlist_add_nvlist_array(nvroot, ZPOOL_CONFIG_CHILDREN, 720 child, children) != 0) { 721 nvlist_free(nvroot); 722 goto nomem; 723 } 724 725 for (c = 0; c < children; c++) 726 nvlist_free(child[c]); 727 free(child); 728 children = 0; 729 child = NULL; 730 731 /* 732 * Go through and fix up any paths and/or devids based on our 733 * known list of vdev GUID -> path mappings. 734 */ 735 if (fix_paths(nvroot, pl->names) != 0) { 736 nvlist_free(nvroot); 737 goto nomem; 738 } 739 740 /* 741 * Add the root vdev to this pool's configuration. 742 */ 743 if (nvlist_add_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, 744 nvroot) != 0) { 745 nvlist_free(nvroot); 746 goto nomem; 747 } 748 nvlist_free(nvroot); 749 750 /* 751 * zdb uses this path to report on active pools that were 752 * imported or created using -R. 753 */ 754 if (active_ok) 755 goto add_pool; 756 757 /* 758 * Determine if this pool is currently active, in which case we 759 * can't actually import it. 760 */ 761 verify(nvlist_lookup_string(config, ZPOOL_CONFIG_POOL_NAME, 762 &name) == 0); 763 verify(nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_GUID, 764 &guid) == 0); 765 766 if (pool_active(hdl, name, guid, &isactive) != 0) 767 goto error; 768 769 if (isactive) { 770 nvlist_free(config); 771 config = NULL; 772 continue; 773 } 774 775 if ((nvl = refresh_config(hdl, config)) == NULL) { 776 nvlist_free(config); 777 config = NULL; 778 continue; 779 } 780 781 nvlist_free(config); 782 config = nvl; 783 784 /* 785 * Go through and update the paths for spares, now that we have 786 * them. 787 */ 788 verify(nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, 789 &nvroot) == 0); 790 if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_SPARES, 791 &spares, &nspares) == 0) { 792 for (i = 0; i < nspares; i++) { 793 if (fix_paths(spares[i], pl->names) != 0) 794 goto nomem; 795 } 796 } 797 798 /* 799 * Update the paths for l2cache devices. 800 */ 801 if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_L2CACHE, 802 &l2cache, &nl2cache) == 0) { 803 for (i = 0; i < nl2cache; i++) { 804 if (fix_paths(l2cache[i], pl->names) != 0) 805 goto nomem; 806 } 807 } 808 809 /* 810 * Restore the original information read from the actual label. 811 */ 812 (void) nvlist_remove(config, ZPOOL_CONFIG_HOSTID, 813 DATA_TYPE_UINT64); 814 (void) nvlist_remove(config, ZPOOL_CONFIG_HOSTNAME, 815 DATA_TYPE_STRING); 816 if (hostid != 0) { 817 verify(nvlist_add_uint64(config, ZPOOL_CONFIG_HOSTID, 818 hostid) == 0); 819 verify(nvlist_add_string(config, ZPOOL_CONFIG_HOSTNAME, 820 hostname) == 0); 821 } 822 823add_pool: 824 /* 825 * Add this pool to the list of configs. 826 */ 827 verify(nvlist_lookup_string(config, ZPOOL_CONFIG_POOL_NAME, 828 &name) == 0); 829 if (nvlist_add_nvlist(ret, name, config) != 0) 830 goto nomem; 831 832 found_one = B_TRUE; 833 nvlist_free(config); 834 config = NULL; 835 } 836 837 if (!found_one) { 838 nvlist_free(ret); 839 ret = NULL; 840 } 841 842 return (ret); 843 844nomem: 845 (void) no_memory(hdl); 846error: 847 nvlist_free(config); 848 nvlist_free(ret); 849 for (c = 0; c < children; c++) 850 nvlist_free(child[c]); 851 free(child); 852 853 return (NULL); 854} 855 856/* 857 * Return the offset of the given label. 858 */ 859static uint64_t 860label_offset(uint64_t size, int l) 861{ 862 ASSERT(P2PHASE_TYPED(size, sizeof (vdev_label_t), uint64_t) == 0); 863 return (l * sizeof (vdev_label_t) + (l < VDEV_LABELS / 2 ? 864 0 : size - VDEV_LABELS * sizeof (vdev_label_t))); 865} 866 867/* 868 * Given a file descriptor, read the label information and return an nvlist 869 * describing the configuration, if there is one. 870 */ 871int 872zpool_read_label(int fd, nvlist_t **config) 873{ 874 struct stat64 statbuf; 875 int l; 876 vdev_label_t *label; 877 uint64_t state, txg, size; 878 879 *config = NULL; 880 881 if (fstat64(fd, &statbuf) == -1) 882 return (0); 883 size = P2ALIGN_TYPED(statbuf.st_size, sizeof (vdev_label_t), uint64_t); 884 885 if ((label = malloc(sizeof (vdev_label_t))) == NULL) 886 return (-1); 887 888 for (l = 0; l < VDEV_LABELS; l++) { 889 if (pread64(fd, label, sizeof (vdev_label_t), 890 label_offset(size, l)) != sizeof (vdev_label_t)) 891 continue; 892 893 if (nvlist_unpack(label->vl_vdev_phys.vp_nvlist, 894 sizeof (label->vl_vdev_phys.vp_nvlist), config, 0) != 0) 895 continue; 896 897 if (nvlist_lookup_uint64(*config, ZPOOL_CONFIG_POOL_STATE, 898 &state) != 0 || state > POOL_STATE_L2CACHE) { 899 nvlist_free(*config); 900 continue; 901 } 902 903 if (state != POOL_STATE_SPARE && state != POOL_STATE_L2CACHE && 904 (nvlist_lookup_uint64(*config, ZPOOL_CONFIG_POOL_TXG, 905 &txg) != 0 || txg == 0)) { 906 nvlist_free(*config); 907 continue; 908 } 909 910 free(label); 911 return (0); 912 } 913 914 free(label); 915 *config = NULL; 916 return (0); 917} 918 919typedef struct rdsk_node { 920 char *rn_name; 921 int rn_dfd; 922 libzfs_handle_t *rn_hdl; 923 nvlist_t *rn_config; 924 avl_tree_t *rn_avl; 925 avl_node_t rn_node; 926 boolean_t rn_nozpool; 927} rdsk_node_t; 928 929static int 930slice_cache_compare(const void *arg1, const void *arg2) 931{ 932 const char *nm1 = ((rdsk_node_t *)arg1)->rn_name; 933 const char *nm2 = ((rdsk_node_t *)arg2)->rn_name; 934 char *nm1slice, *nm2slice; 935 int rv; 936 937 /* 938 * slices zero and two are the most likely to provide results, 939 * so put those first 940 */ 941 nm1slice = strstr(nm1, "s0"); 942 nm2slice = strstr(nm2, "s0"); 943 if (nm1slice && !nm2slice) { 944 return (-1); 945 } 946 if (!nm1slice && nm2slice) { 947 return (1); 948 } 949 nm1slice = strstr(nm1, "s2"); 950 nm2slice = strstr(nm2, "s2"); 951 if (nm1slice && !nm2slice) { 952 return (-1); 953 } 954 if (!nm1slice && nm2slice) { 955 return (1); 956 } 957 958 rv = strcmp(nm1, nm2); 959 if (rv == 0) 960 return (0); 961 return (rv > 0 ? 1 : -1); 962} 963 964#ifdef sun 965static void 966check_one_slice(avl_tree_t *r, char *diskname, uint_t partno, 967 diskaddr_t size, uint_t blksz) 968{ 969 rdsk_node_t tmpnode; 970 rdsk_node_t *node; 971 char sname[MAXNAMELEN]; 972 973 tmpnode.rn_name = &sname[0]; 974 (void) snprintf(tmpnode.rn_name, MAXNAMELEN, "%s%u", 975 diskname, partno); 976 /* 977 * protect against division by zero for disk labels that 978 * contain a bogus sector size 979 */ 980 if (blksz == 0) 981 blksz = DEV_BSIZE; 982 /* too small to contain a zpool? */ 983 if ((size < (SPA_MINDEVSIZE / blksz)) && 984 (node = avl_find(r, &tmpnode, NULL))) 985 node->rn_nozpool = B_TRUE; 986} 987#endif /* sun */ 988 989static void 990nozpool_all_slices(avl_tree_t *r, const char *sname) 991{ 992#ifdef sun 993 char diskname[MAXNAMELEN]; 994 char *ptr; 995 int i; 996 997 (void) strncpy(diskname, sname, MAXNAMELEN); 998 if (((ptr = strrchr(diskname, 's')) == NULL) && 999 ((ptr = strrchr(diskname, 'p')) == NULL)) 1000 return; 1001 ptr[0] = 's'; 1002 ptr[1] = '\0'; 1003 for (i = 0; i < NDKMAP; i++) 1004 check_one_slice(r, diskname, i, 0, 1); 1005 ptr[0] = 'p'; 1006 for (i = 0; i <= FD_NUMPART; i++) 1007 check_one_slice(r, diskname, i, 0, 1); 1008#endif /* sun */ 1009} 1010 1011static void 1012check_slices(avl_tree_t *r, int fd, const char *sname) 1013{ 1014#ifdef sun 1015 struct extvtoc vtoc; 1016 struct dk_gpt *gpt; 1017 char diskname[MAXNAMELEN]; 1018 char *ptr; 1019 int i; 1020 1021 (void) strncpy(diskname, sname, MAXNAMELEN); 1022 if ((ptr = strrchr(diskname, 's')) == NULL || !isdigit(ptr[1])) 1023 return; 1024 ptr[1] = '\0'; 1025 1026 if (read_extvtoc(fd, &vtoc) >= 0) { 1027 for (i = 0; i < NDKMAP; i++) 1028 check_one_slice(r, diskname, i, 1029 vtoc.v_part[i].p_size, vtoc.v_sectorsz); 1030 } else if (efi_alloc_and_read(fd, &gpt) >= 0) { 1031 /* 1032 * on x86 we'll still have leftover links that point 1033 * to slices s[9-15], so use NDKMAP instead 1034 */ 1035 for (i = 0; i < NDKMAP; i++) 1036 check_one_slice(r, diskname, i, 1037 gpt->efi_parts[i].p_size, gpt->efi_lbasize); 1038 /* nodes p[1-4] are never used with EFI labels */ 1039 ptr[0] = 'p'; 1040 for (i = 1; i <= FD_NUMPART; i++) 1041 check_one_slice(r, diskname, i, 0, 1); 1042 efi_free(gpt); 1043 } 1044#endif /* sun */ 1045} 1046 1047static void 1048zpool_open_func(void *arg) 1049{ 1050 rdsk_node_t *rn = arg; 1051 struct stat64 statbuf; 1052 nvlist_t *config; 1053 int fd; 1054 1055 if (rn->rn_nozpool) 1056 return; 1057 if ((fd = openat64(rn->rn_dfd, rn->rn_name, O_RDONLY)) < 0) { 1058 /* symlink to a device that's no longer there */ 1059 if (errno == ENOENT) 1060 nozpool_all_slices(rn->rn_avl, rn->rn_name); 1061 return; 1062 } 1063 /* 1064 * Ignore failed stats. We only want regular 1065 * files, character devs and block devs. 1066 */ 1067 if (fstat64(fd, &statbuf) != 0 || 1068 (!S_ISREG(statbuf.st_mode) && 1069 !S_ISCHR(statbuf.st_mode) && 1070 !S_ISBLK(statbuf.st_mode))) { 1071 (void) close(fd); 1072 return; 1073 } 1074 /* this file is too small to hold a zpool */ 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 1087 if ((zpool_read_label(fd, &config)) != 0) { 1088 (void) close(fd); 1089 (void) no_memory(rn->rn_hdl); 1090 return; 1091 } 1092 (void) close(fd); 1093 1094 1095 rn->rn_config = config; 1096 if (config != NULL) { 1097 assert(rn->rn_nozpool == B_FALSE); 1098 } 1099} 1100 1101/* 1102 * Given a file descriptor, clear (zero) the label information. This function 1103 * is used in the appliance stack as part of the ZFS sysevent module and 1104 * to implement the "zpool labelclear" command. 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 return (-1); 1125 } 1126 1127 free(label); 1128 return (0); 1129} 1130 1131/* 1132 * Given a list of directories to search, find all pools stored on disk. This 1133 * includes partial pools which are not available to import. If no args are 1134 * given (argc is 0), then the default directory (/dev/dsk) is searched. 1135 * poolname or guid (but not both) are provided by the caller when trying 1136 * to import a specific pool. 1137 */ 1138static nvlist_t * 1139zpool_find_import_impl(libzfs_handle_t *hdl, importargs_t *iarg) 1140{ 1141 int i, dirs = iarg->paths; 1142 DIR *dirp = NULL; 1143 struct dirent64 *dp; 1144 char path[MAXPATHLEN]; 1145 char *end, **dir = iarg->path; 1146 size_t pathleft; 1147 nvlist_t *ret = NULL; 1148 static char *default_dir = "/dev"; 1149 pool_list_t pools = { 0 }; 1150 pool_entry_t *pe, *penext; 1151 vdev_entry_t *ve, *venext; 1152 config_entry_t *ce, *cenext; 1153 name_entry_t *ne, *nenext; 1154 avl_tree_t slice_cache; 1155 rdsk_node_t *slice; 1156 void *cookie; 1157 1158 if (dirs == 0) { 1159 dirs = 1; 1160 dir = &default_dir; 1161 } 1162 1163 /* 1164 * Go through and read the label configuration information from every 1165 * possible device, organizing the information according to pool GUID 1166 * and toplevel GUID. 1167 */ 1168 for (i = 0; i < dirs; i++) { 1169 tpool_t *t; 1170 char *rdsk; 1171 int dfd; 1172 1173 /* use realpath to normalize the path */ 1174 if (realpath(dir[i], path) == 0) { 1175 (void) zfs_error_fmt(hdl, EZFS_BADPATH, 1176 dgettext(TEXT_DOMAIN, "cannot open '%s'"), dir[i]); 1177 goto error; 1178 } 1179 end = &path[strlen(path)]; 1180 *end++ = '/'; 1181 *end = 0; 1182 pathleft = &path[sizeof (path)] - end; 1183 1184 /* 1185 * Using raw devices instead of block devices when we're 1186 * reading the labels skips a bunch of slow operations during 1187 * close(2) processing, so we replace /dev/dsk with /dev/rdsk. 1188 */ 1189 if (strcmp(path, "/dev/dsk/") == 0) 1190 rdsk = "/dev/"; 1191 else 1192 rdsk = path; 1193 1194 if ((dfd = open64(rdsk, O_RDONLY)) < 0 || 1195 (dirp = fdopendir(dfd)) == NULL) { 1196 zfs_error_aux(hdl, strerror(errno)); 1197 (void) zfs_error_fmt(hdl, EZFS_BADPATH, 1198 dgettext(TEXT_DOMAIN, "cannot open '%s'"), 1199 rdsk); 1200 goto error; 1201 } 1202 1203 avl_create(&slice_cache, slice_cache_compare, 1204 sizeof (rdsk_node_t), offsetof(rdsk_node_t, rn_node)); 1205 1206 if (strcmp(rdsk, "/dev/") == 0) { 1207 struct gmesh mesh; 1208 struct gclass *mp; 1209 struct ggeom *gp; 1210 struct gprovider *pp; 1211 1212 errno = geom_gettree(&mesh); 1213 if (errno != 0) { 1214 zfs_error_aux(hdl, strerror(errno)); 1215 (void) zfs_error_fmt(hdl, EZFS_BADPATH, 1216 dgettext(TEXT_DOMAIN, "cannot get GEOM tree")); 1217 goto error; 1218 } 1219 1220 LIST_FOREACH(mp, &mesh.lg_class, lg_class) { 1221 LIST_FOREACH(gp, &mp->lg_geom, lg_geom) { 1222 LIST_FOREACH(pp, &gp->lg_provider, lg_provider) { 1223 slice = zfs_alloc(hdl, sizeof (rdsk_node_t)); 1224 slice->rn_name = zfs_strdup(hdl, pp->lg_name); 1225 slice->rn_avl = &slice_cache; 1226 slice->rn_dfd = dfd; 1227 slice->rn_hdl = hdl; 1228 slice->rn_nozpool = B_FALSE; 1229 avl_add(&slice_cache, slice); 1230 } 1231 } 1232 } 1233 1234 geom_deletetree(&mesh); 1235 goto skipdir; 1236 } 1237 1238 /* 1239 * This is not MT-safe, but we have no MT consumers of libzfs 1240 */ 1241 while ((dp = readdir64(dirp)) != NULL) { 1242 const char *name = dp->d_name; 1243 if (name[0] == '.' && 1244 (name[1] == 0 || (name[1] == '.' && name[2] == 0))) 1245 continue; 1246 1247 slice = zfs_alloc(hdl, sizeof (rdsk_node_t)); 1248 slice->rn_name = zfs_strdup(hdl, name); 1249 slice->rn_avl = &slice_cache; 1250 slice->rn_dfd = dfd; 1251 slice->rn_hdl = hdl; 1252 slice->rn_nozpool = B_FALSE; 1253 avl_add(&slice_cache, slice); 1254 } 1255skipdir: 1256 /* 1257 * create a thread pool to do all of this in parallel; 1258 * rn_nozpool is not protected, so this is racy in that 1259 * multiple tasks could decide that the same slice can 1260 * not hold a zpool, which is benign. Also choose 1261 * double the number of processors; we hold a lot of 1262 * locks in the kernel, so going beyond this doesn't 1263 * buy us much. 1264 */ 1265 t = tpool_create(1, 2 * sysconf(_SC_NPROCESSORS_ONLN), 1266 0, NULL); 1267 for (slice = avl_first(&slice_cache); slice; 1268 (slice = avl_walk(&slice_cache, slice, 1269 AVL_AFTER))) 1270 (void) tpool_dispatch(t, zpool_open_func, slice); 1271 tpool_wait(t); 1272 tpool_destroy(t); 1273 1274 cookie = NULL; 1275 while ((slice = avl_destroy_nodes(&slice_cache, 1276 &cookie)) != NULL) { 1277 if (slice->rn_config != NULL) { 1278 nvlist_t *config = slice->rn_config; 1279 boolean_t matched = B_TRUE; 1280 1281 if (iarg->poolname != NULL) { 1282 char *pname; 1283 1284 matched = nvlist_lookup_string(config, 1285 ZPOOL_CONFIG_POOL_NAME, 1286 &pname) == 0 && 1287 strcmp(iarg->poolname, pname) == 0; 1288 } else if (iarg->guid != 0) { 1289 uint64_t this_guid; 1290 1291 matched = nvlist_lookup_uint64(config, 1292 ZPOOL_CONFIG_POOL_GUID, 1293 &this_guid) == 0 && 1294 iarg->guid == this_guid; 1295 } 1296 if (!matched) { 1297 nvlist_free(config); 1298 config = NULL; 1299 continue; 1300 } 1301 /* use the non-raw path for the config */ 1302 (void) strlcpy(end, slice->rn_name, pathleft); 1303 if (add_config(hdl, &pools, path, config) != 0) 1304 goto error; 1305 } 1306 free(slice->rn_name); 1307 free(slice); 1308 } 1309 avl_destroy(&slice_cache); 1310 1311 (void) closedir(dirp); 1312 dirp = NULL; 1313 } 1314 1315 ret = get_configs(hdl, &pools, iarg->can_be_active); 1316 1317error: 1318 for (pe = pools.pools; pe != NULL; pe = penext) { 1319 penext = pe->pe_next; 1320 for (ve = pe->pe_vdevs; ve != NULL; ve = venext) { 1321 venext = ve->ve_next; 1322 for (ce = ve->ve_configs; ce != NULL; ce = cenext) { 1323 cenext = ce->ce_next; 1324 if (ce->ce_config) 1325 nvlist_free(ce->ce_config); 1326 free(ce); 1327 } 1328 free(ve); 1329 } 1330 free(pe); 1331 } 1332 1333 for (ne = pools.names; ne != NULL; ne = nenext) { 1334 nenext = ne->ne_next; 1335 if (ne->ne_name) 1336 free(ne->ne_name); 1337 free(ne); 1338 } 1339 1340 if (dirp) 1341 (void) closedir(dirp); 1342 1343 return (ret); 1344} 1345 1346nvlist_t * 1347zpool_find_import(libzfs_handle_t *hdl, int argc, char **argv) 1348{ 1349 importargs_t iarg = { 0 }; 1350 1351 iarg.paths = argc; 1352 iarg.path = argv; 1353 1354 return (zpool_find_import_impl(hdl, &iarg)); 1355} 1356 1357/* 1358 * Given a cache file, return the contents as a list of importable pools. 1359 * poolname or guid (but not both) are provided by the caller when trying 1360 * to import a specific pool. 1361 */ 1362nvlist_t * 1363zpool_find_import_cached(libzfs_handle_t *hdl, const char *cachefile, 1364 char *poolname, uint64_t guid) 1365{ 1366 char *buf; 1367 int fd; 1368 struct stat64 statbuf; 1369 nvlist_t *raw, *src, *dst; 1370 nvlist_t *pools; 1371 nvpair_t *elem; 1372 char *name; 1373 uint64_t this_guid; 1374 boolean_t active; 1375 1376 verify(poolname == NULL || guid == 0); 1377 1378 if ((fd = open(cachefile, O_RDONLY)) < 0) { 1379 zfs_error_aux(hdl, "%s", strerror(errno)); 1380 (void) zfs_error(hdl, EZFS_BADCACHE, 1381 dgettext(TEXT_DOMAIN, "failed to open cache file")); 1382 return (NULL); 1383 } 1384 1385 if (fstat64(fd, &statbuf) != 0) { 1386 zfs_error_aux(hdl, "%s", strerror(errno)); 1387 (void) close(fd); 1388 (void) zfs_error(hdl, EZFS_BADCACHE, 1389 dgettext(TEXT_DOMAIN, "failed to get size of cache file")); 1390 return (NULL); 1391 } 1392 1393 if ((buf = zfs_alloc(hdl, statbuf.st_size)) == NULL) { 1394 (void) close(fd); 1395 return (NULL); 1396 } 1397 1398 if (read(fd, buf, statbuf.st_size) != statbuf.st_size) { 1399 (void) close(fd); 1400 free(buf); 1401 (void) zfs_error(hdl, EZFS_BADCACHE, 1402 dgettext(TEXT_DOMAIN, 1403 "failed to read cache file contents")); 1404 return (NULL); 1405 } 1406 1407 (void) close(fd); 1408 1409 if (nvlist_unpack(buf, statbuf.st_size, &raw, 0) != 0) { 1410 free(buf); 1411 (void) zfs_error(hdl, EZFS_BADCACHE, 1412 dgettext(TEXT_DOMAIN, 1413 "invalid or corrupt cache file contents")); 1414 return (NULL); 1415 } 1416 1417 free(buf); 1418 1419 /* 1420 * Go through and get the current state of the pools and refresh their 1421 * state. 1422 */ 1423 if (nvlist_alloc(&pools, 0, 0) != 0) { 1424 (void) no_memory(hdl); 1425 nvlist_free(raw); 1426 return (NULL); 1427 } 1428 1429 elem = NULL; 1430 while ((elem = nvlist_next_nvpair(raw, elem)) != NULL) { 1431 verify(nvpair_value_nvlist(elem, &src) == 0); 1432 1433 verify(nvlist_lookup_string(src, ZPOOL_CONFIG_POOL_NAME, 1434 &name) == 0); 1435 if (poolname != NULL && strcmp(poolname, name) != 0) 1436 continue; 1437 1438 verify(nvlist_lookup_uint64(src, ZPOOL_CONFIG_POOL_GUID, 1439 &this_guid) == 0); 1440 if (guid != 0) { 1441 verify(nvlist_lookup_uint64(src, ZPOOL_CONFIG_POOL_GUID, 1442 &this_guid) == 0); 1443 if (guid != this_guid) 1444 continue; 1445 } 1446 1447 if (pool_active(hdl, name, this_guid, &active) != 0) { 1448 nvlist_free(raw); 1449 nvlist_free(pools); 1450 return (NULL); 1451 } 1452 1453 if (active) 1454 continue; 1455 1456 if ((dst = refresh_config(hdl, src)) == NULL) { 1457 nvlist_free(raw); 1458 nvlist_free(pools); 1459 return (NULL); 1460 } 1461 1462 if (nvlist_add_nvlist(pools, nvpair_name(elem), dst) != 0) { 1463 (void) no_memory(hdl); 1464 nvlist_free(dst); 1465 nvlist_free(raw); 1466 nvlist_free(pools); 1467 return (NULL); 1468 } 1469 nvlist_free(dst); 1470 } 1471 1472 nvlist_free(raw); 1473 return (pools); 1474} 1475 1476static int 1477name_or_guid_exists(zpool_handle_t *zhp, void *data) 1478{ 1479 importargs_t *import = data; 1480 int found = 0; 1481 1482 if (import->poolname != NULL) { 1483 char *pool_name; 1484 1485 verify(nvlist_lookup_string(zhp->zpool_config, 1486 ZPOOL_CONFIG_POOL_NAME, &pool_name) == 0); 1487 if (strcmp(pool_name, import->poolname) == 0) 1488 found = 1; 1489 } else { 1490 uint64_t pool_guid; 1491 1492 verify(nvlist_lookup_uint64(zhp->zpool_config, 1493 ZPOOL_CONFIG_POOL_GUID, &pool_guid) == 0); 1494 if (pool_guid == import->guid) 1495 found = 1; 1496 } 1497 1498 zpool_close(zhp); 1499 return (found); 1500} 1501 1502nvlist_t * 1503zpool_search_import(libzfs_handle_t *hdl, importargs_t *import) 1504{ 1505 verify(import->poolname == NULL || import->guid == 0); 1506 1507 if (import->unique) 1508 import->exists = zpool_iter(hdl, name_or_guid_exists, import); 1509 1510 if (import->cachefile != NULL) 1511 return (zpool_find_import_cached(hdl, import->cachefile, 1512 import->poolname, import->guid)); 1513 1514 return (zpool_find_import_impl(hdl, import)); 1515} 1516 1517boolean_t 1518find_guid(nvlist_t *nv, uint64_t guid) 1519{ 1520 uint64_t tmp; 1521 nvlist_t **child; 1522 uint_t c, children; 1523 1524 verify(nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID, &tmp) == 0); 1525 if (tmp == guid) 1526 return (B_TRUE); 1527 1528 if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_CHILDREN, 1529 &child, &children) == 0) { 1530 for (c = 0; c < children; c++) 1531 if (find_guid(child[c], guid)) 1532 return (B_TRUE); 1533 } 1534 1535 return (B_FALSE); 1536} 1537 1538typedef struct aux_cbdata { 1539 const char *cb_type; 1540 uint64_t cb_guid; 1541 zpool_handle_t *cb_zhp; 1542} aux_cbdata_t; 1543 1544static int 1545find_aux(zpool_handle_t *zhp, void *data) 1546{ 1547 aux_cbdata_t *cbp = data; 1548 nvlist_t **list; 1549 uint_t i, count; 1550 uint64_t guid; 1551 nvlist_t *nvroot; 1552 1553 verify(nvlist_lookup_nvlist(zhp->zpool_config, ZPOOL_CONFIG_VDEV_TREE, 1554 &nvroot) == 0); 1555 1556 if (nvlist_lookup_nvlist_array(nvroot, cbp->cb_type, 1557 &list, &count) == 0) { 1558 for (i = 0; i < count; i++) { 1559 verify(nvlist_lookup_uint64(list[i], 1560 ZPOOL_CONFIG_GUID, &guid) == 0); 1561 if (guid == cbp->cb_guid) { 1562 cbp->cb_zhp = zhp; 1563 return (1); 1564 } 1565 } 1566 } 1567 1568 zpool_close(zhp); 1569 return (0); 1570} 1571 1572/* 1573 * Determines if the pool is in use. If so, it returns true and the state of 1574 * the pool as well as the name of the pool. Both strings are allocated and 1575 * must be freed by the caller. 1576 */ 1577int 1578zpool_in_use(libzfs_handle_t *hdl, int fd, pool_state_t *state, char **namestr, 1579 boolean_t *inuse) 1580{ 1581 nvlist_t *config; 1582 char *name; 1583 boolean_t ret; 1584 uint64_t guid, vdev_guid; 1585 zpool_handle_t *zhp; 1586 nvlist_t *pool_config; 1587 uint64_t stateval, isspare; 1588 aux_cbdata_t cb = { 0 }; 1589 boolean_t isactive; 1590 1591 *inuse = B_FALSE; 1592 1593 if (zpool_read_label(fd, &config) != 0) { 1594 (void) no_memory(hdl); 1595 return (-1); 1596 } 1597 1598 if (config == NULL) 1599 return (0); 1600 1601 verify(nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_STATE, 1602 &stateval) == 0); 1603 verify(nvlist_lookup_uint64(config, ZPOOL_CONFIG_GUID, 1604 &vdev_guid) == 0); 1605 1606 if (stateval != POOL_STATE_SPARE && stateval != POOL_STATE_L2CACHE) { 1607 verify(nvlist_lookup_string(config, ZPOOL_CONFIG_POOL_NAME, 1608 &name) == 0); 1609 verify(nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_GUID, 1610 &guid) == 0); 1611 } 1612 1613 switch (stateval) { 1614 case POOL_STATE_EXPORTED: 1615 /* 1616 * A pool with an exported state may in fact be imported 1617 * read-only, so check the in-core state to see if it's 1618 * active and imported read-only. If it is, set 1619 * its state to active. 1620 */ 1621 if (pool_active(hdl, name, guid, &isactive) == 0 && isactive && 1622 (zhp = zpool_open_canfail(hdl, name)) != NULL && 1623 zpool_get_prop_int(zhp, ZPOOL_PROP_READONLY, NULL)) 1624 stateval = POOL_STATE_ACTIVE; 1625 1626 ret = B_TRUE; 1627 break; 1628 1629 case POOL_STATE_ACTIVE: 1630 /* 1631 * For an active pool, we have to determine if it's really part 1632 * of a currently active pool (in which case the pool will exist 1633 * and the guid will be the same), or whether it's part of an 1634 * active pool that was disconnected without being explicitly 1635 * exported. 1636 */ 1637 if (pool_active(hdl, name, guid, &isactive) != 0) { 1638 nvlist_free(config); 1639 return (-1); 1640 } 1641 1642 if (isactive) { 1643 /* 1644 * Because the device may have been removed while 1645 * offlined, we only report it as active if the vdev is 1646 * still present in the config. Otherwise, pretend like 1647 * it's not in use. 1648 */ 1649 if ((zhp = zpool_open_canfail(hdl, name)) != NULL && 1650 (pool_config = zpool_get_config(zhp, NULL)) 1651 != NULL) { 1652 nvlist_t *nvroot; 1653 1654 verify(nvlist_lookup_nvlist(pool_config, 1655 ZPOOL_CONFIG_VDEV_TREE, &nvroot) == 0); 1656 ret = find_guid(nvroot, vdev_guid); 1657 } else { 1658 ret = B_FALSE; 1659 } 1660 1661 /* 1662 * If this is an active spare within another pool, we 1663 * treat it like an unused hot spare. This allows the 1664 * user to create a pool with a hot spare that currently 1665 * in use within another pool. Since we return B_TRUE, 1666 * libdiskmgt will continue to prevent generic consumers 1667 * from using the device. 1668 */ 1669 if (ret && nvlist_lookup_uint64(config, 1670 ZPOOL_CONFIG_IS_SPARE, &isspare) == 0 && isspare) 1671 stateval = POOL_STATE_SPARE; 1672 1673 if (zhp != NULL) 1674 zpool_close(zhp); 1675 } else { 1676 stateval = POOL_STATE_POTENTIALLY_ACTIVE; 1677 ret = B_TRUE; 1678 } 1679 break; 1680 1681 case POOL_STATE_SPARE: 1682 /* 1683 * For a hot spare, it can be either definitively in use, or 1684 * potentially active. To determine if it's in use, we iterate 1685 * over all pools in the system and search for one with a spare 1686 * with a matching guid. 1687 * 1688 * Due to the shared nature of spares, we don't actually report 1689 * the potentially active case as in use. This means the user 1690 * can freely create pools on the hot spares of exported pools, 1691 * but to do otherwise makes the resulting code complicated, and 1692 * we end up having to deal with this case anyway. 1693 */ 1694 cb.cb_zhp = NULL; 1695 cb.cb_guid = vdev_guid; 1696 cb.cb_type = ZPOOL_CONFIG_SPARES; 1697 if (zpool_iter(hdl, find_aux, &cb) == 1) { 1698 name = (char *)zpool_get_name(cb.cb_zhp); 1699 ret = TRUE; 1700 } else { 1701 ret = FALSE; 1702 } 1703 break; 1704 1705 case POOL_STATE_L2CACHE: 1706 1707 /* 1708 * Check if any pool is currently using this l2cache device. 1709 */ 1710 cb.cb_zhp = NULL; 1711 cb.cb_guid = vdev_guid; 1712 cb.cb_type = ZPOOL_CONFIG_L2CACHE; 1713 if (zpool_iter(hdl, find_aux, &cb) == 1) { 1714 name = (char *)zpool_get_name(cb.cb_zhp); 1715 ret = TRUE; 1716 } else { 1717 ret = FALSE; 1718 } 1719 break; 1720 1721 default: 1722 ret = B_FALSE; 1723 } 1724 1725 1726 if (ret) { 1727 if ((*namestr = zfs_strdup(hdl, name)) == NULL) { 1728 if (cb.cb_zhp) 1729 zpool_close(cb.cb_zhp); 1730 nvlist_free(config); 1731 return (-1); 1732 } 1733 *state = (pool_state_t)stateval; 1734 } 1735 1736 if (cb.cb_zhp) 1737 zpool_close(cb.cb_zhp); 1738 1739 nvlist_free(config); 1740 *inuse = ret; 1741 return (0); 1742} 1743