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) 2012 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; 441 uint64_t 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, version; 535 char *comment = NULL; 536 537 version = fnvlist_lookup_uint64(tmp, 538 ZPOOL_CONFIG_VERSION); 539 fnvlist_add_uint64(config, 540 ZPOOL_CONFIG_VERSION, version); 541 guid = fnvlist_lookup_uint64(tmp, 542 ZPOOL_CONFIG_POOL_GUID); 543 fnvlist_add_uint64(config, 544 ZPOOL_CONFIG_POOL_GUID, guid); 545 name = fnvlist_lookup_string(tmp, 546 ZPOOL_CONFIG_POOL_NAME); 547 fnvlist_add_string(config, 548 ZPOOL_CONFIG_POOL_NAME, name); 549 550 if (nvlist_lookup_string(tmp, 551 ZPOOL_CONFIG_COMMENT, &comment) == 0) 552 fnvlist_add_string(config, 553 ZPOOL_CONFIG_COMMENT, comment); 554 555 state = fnvlist_lookup_uint64(tmp, 556 ZPOOL_CONFIG_POOL_STATE); 557 fnvlist_add_uint64(config, 558 ZPOOL_CONFIG_POOL_STATE, state); 559 560 hostid = 0; 561 if (nvlist_lookup_uint64(tmp, 562 ZPOOL_CONFIG_HOSTID, &hostid) == 0) { 563 fnvlist_add_uint64(config, 564 ZPOOL_CONFIG_HOSTID, hostid); 565 hostname = fnvlist_lookup_string(tmp, 566 ZPOOL_CONFIG_HOSTNAME); 567 fnvlist_add_string(config, 568 ZPOOL_CONFIG_HOSTNAME, hostname); 569 } 570 571 config_seen = B_TRUE; 572 } 573 574 /* 575 * Add this top-level vdev to the child array. 576 */ 577 verify(nvlist_lookup_nvlist(tmp, 578 ZPOOL_CONFIG_VDEV_TREE, &nvtop) == 0); 579 verify(nvlist_lookup_uint64(nvtop, ZPOOL_CONFIG_ID, 580 &id) == 0); 581 582 if (id >= children) { 583 nvlist_t **newchild; 584 585 newchild = zfs_alloc(hdl, (id + 1) * 586 sizeof (nvlist_t *)); 587 if (newchild == NULL) 588 goto nomem; 589 590 for (c = 0; c < children; c++) 591 newchild[c] = child[c]; 592 593 free(child); 594 child = newchild; 595 children = id + 1; 596 } 597 if (nvlist_dup(nvtop, &child[id], 0) != 0) 598 goto nomem; 599 600 } 601 602 /* 603 * If we have information about all the top-levels then 604 * clean up the nvlist which we've constructed. This 605 * means removing any extraneous devices that are 606 * beyond the valid range or adding devices to the end 607 * of our array which appear to be missing. 608 */ 609 if (valid_top_config) { 610 if (max_id < children) { 611 for (c = max_id; c < children; c++) 612 nvlist_free(child[c]); 613 children = max_id; 614 } else if (max_id > children) { 615 nvlist_t **newchild; 616 617 newchild = zfs_alloc(hdl, (max_id) * 618 sizeof (nvlist_t *)); 619 if (newchild == NULL) 620 goto nomem; 621 622 for (c = 0; c < children; c++) 623 newchild[c] = child[c]; 624 625 free(child); 626 child = newchild; 627 children = max_id; 628 } 629 } 630 631 verify(nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_GUID, 632 &guid) == 0); 633 634 /* 635 * The vdev namespace may contain holes as a result of 636 * device removal. We must add them back into the vdev 637 * tree before we process any missing devices. 638 */ 639 if (holes > 0) { 640 ASSERT(valid_top_config); 641 642 for (c = 0; c < children; c++) { 643 nvlist_t *holey; 644 645 if (child[c] != NULL || 646 !vdev_is_hole(hole_array, holes, c)) 647 continue; 648 649 if (nvlist_alloc(&holey, NV_UNIQUE_NAME, 650 0) != 0) 651 goto nomem; 652 653 /* 654 * Holes in the namespace are treated as 655 * "hole" top-level vdevs and have a 656 * special flag set on them. 657 */ 658 if (nvlist_add_string(holey, 659 ZPOOL_CONFIG_TYPE, 660 VDEV_TYPE_HOLE) != 0 || 661 nvlist_add_uint64(holey, 662 ZPOOL_CONFIG_ID, c) != 0 || 663 nvlist_add_uint64(holey, 664 ZPOOL_CONFIG_GUID, 0ULL) != 0) 665 goto nomem; 666 child[c] = holey; 667 } 668 } 669 670 /* 671 * Look for any missing top-level vdevs. If this is the case, 672 * create a faked up 'missing' vdev as a placeholder. We cannot 673 * simply compress the child array, because the kernel performs 674 * certain checks to make sure the vdev IDs match their location 675 * in the configuration. 676 */ 677 for (c = 0; c < children; c++) { 678 if (child[c] == NULL) { 679 nvlist_t *missing; 680 if (nvlist_alloc(&missing, NV_UNIQUE_NAME, 681 0) != 0) 682 goto nomem; 683 if (nvlist_add_string(missing, 684 ZPOOL_CONFIG_TYPE, 685 VDEV_TYPE_MISSING) != 0 || 686 nvlist_add_uint64(missing, 687 ZPOOL_CONFIG_ID, c) != 0 || 688 nvlist_add_uint64(missing, 689 ZPOOL_CONFIG_GUID, 0ULL) != 0) { 690 nvlist_free(missing); 691 goto nomem; 692 } 693 child[c] = missing; 694 } 695 } 696 697 /* 698 * Put all of this pool's top-level vdevs into a root vdev. 699 */ 700 if (nvlist_alloc(&nvroot, NV_UNIQUE_NAME, 0) != 0) 701 goto nomem; 702 if (nvlist_add_string(nvroot, ZPOOL_CONFIG_TYPE, 703 VDEV_TYPE_ROOT) != 0 || 704 nvlist_add_uint64(nvroot, ZPOOL_CONFIG_ID, 0ULL) != 0 || 705 nvlist_add_uint64(nvroot, ZPOOL_CONFIG_GUID, guid) != 0 || 706 nvlist_add_nvlist_array(nvroot, ZPOOL_CONFIG_CHILDREN, 707 child, children) != 0) { 708 nvlist_free(nvroot); 709 goto nomem; 710 } 711 712 for (c = 0; c < children; c++) 713 nvlist_free(child[c]); 714 free(child); 715 children = 0; 716 child = NULL; 717 718 /* 719 * Go through and fix up any paths and/or devids based on our 720 * known list of vdev GUID -> path mappings. 721 */ 722 if (fix_paths(nvroot, pl->names) != 0) { 723 nvlist_free(nvroot); 724 goto nomem; 725 } 726 727 /* 728 * Add the root vdev to this pool's configuration. 729 */ 730 if (nvlist_add_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, 731 nvroot) != 0) { 732 nvlist_free(nvroot); 733 goto nomem; 734 } 735 nvlist_free(nvroot); 736 737 /* 738 * zdb uses this path to report on active pools that were 739 * imported or created using -R. 740 */ 741 if (active_ok) 742 goto add_pool; 743 744 /* 745 * Determine if this pool is currently active, in which case we 746 * can't actually import it. 747 */ 748 verify(nvlist_lookup_string(config, ZPOOL_CONFIG_POOL_NAME, 749 &name) == 0); 750 verify(nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_GUID, 751 &guid) == 0); 752 753 if (pool_active(hdl, name, guid, &isactive) != 0) 754 goto error; 755 756 if (isactive) { 757 nvlist_free(config); 758 config = NULL; 759 continue; 760 } 761 762 if ((nvl = refresh_config(hdl, config)) == NULL) { 763 nvlist_free(config); 764 config = NULL; 765 continue; 766 } 767 768 nvlist_free(config); 769 config = nvl; 770 771 /* 772 * Go through and update the paths for spares, now that we have 773 * them. 774 */ 775 verify(nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, 776 &nvroot) == 0); 777 if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_SPARES, 778 &spares, &nspares) == 0) { 779 for (i = 0; i < nspares; i++) { 780 if (fix_paths(spares[i], pl->names) != 0) 781 goto nomem; 782 } 783 } 784 785 /* 786 * Update the paths for l2cache devices. 787 */ 788 if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_L2CACHE, 789 &l2cache, &nl2cache) == 0) { 790 for (i = 0; i < nl2cache; i++) { 791 if (fix_paths(l2cache[i], pl->names) != 0) 792 goto nomem; 793 } 794 } 795 796 /* 797 * Restore the original information read from the actual label. 798 */ 799 (void) nvlist_remove(config, ZPOOL_CONFIG_HOSTID, 800 DATA_TYPE_UINT64); 801 (void) nvlist_remove(config, ZPOOL_CONFIG_HOSTNAME, 802 DATA_TYPE_STRING); 803 if (hostid != 0) { 804 verify(nvlist_add_uint64(config, ZPOOL_CONFIG_HOSTID, 805 hostid) == 0); 806 verify(nvlist_add_string(config, ZPOOL_CONFIG_HOSTNAME, 807 hostname) == 0); 808 } 809 810add_pool: 811 /* 812 * Add this pool to the list of configs. 813 */ 814 verify(nvlist_lookup_string(config, ZPOOL_CONFIG_POOL_NAME, 815 &name) == 0); 816 if (nvlist_add_nvlist(ret, name, config) != 0) 817 goto nomem; 818 819 found_one = B_TRUE; 820 nvlist_free(config); 821 config = NULL; 822 } 823 824 if (!found_one) { 825 nvlist_free(ret); 826 ret = NULL; 827 } 828 829 return (ret); 830 831nomem: 832 (void) no_memory(hdl); 833error: 834 nvlist_free(config); 835 nvlist_free(ret); 836 for (c = 0; c < children; c++) 837 nvlist_free(child[c]); 838 free(child); 839 840 return (NULL); 841} 842 843/* 844 * Return the offset of the given label. 845 */ 846static uint64_t 847label_offset(uint64_t size, int l) 848{ 849 ASSERT(P2PHASE_TYPED(size, sizeof (vdev_label_t), uint64_t) == 0); 850 return (l * sizeof (vdev_label_t) + (l < VDEV_LABELS / 2 ? 851 0 : size - VDEV_LABELS * sizeof (vdev_label_t))); 852} 853 854/* 855 * Given a file descriptor, read the label information and return an nvlist 856 * describing the configuration, if there is one. 857 */ 858int 859zpool_read_label(int fd, nvlist_t **config) 860{ 861 struct stat64 statbuf; 862 int l; 863 vdev_label_t *label; 864 uint64_t state, txg, size; 865 866 *config = NULL; 867 868 if (fstat64(fd, &statbuf) == -1) 869 return (0); 870 size = P2ALIGN_TYPED(statbuf.st_size, sizeof (vdev_label_t), uint64_t); 871 872 if ((label = malloc(sizeof (vdev_label_t))) == NULL) 873 return (-1); 874 875 for (l = 0; l < VDEV_LABELS; l++) { 876 if (pread64(fd, label, sizeof (vdev_label_t), 877 label_offset(size, l)) != sizeof (vdev_label_t)) 878 continue; 879 880 if (nvlist_unpack(label->vl_vdev_phys.vp_nvlist, 881 sizeof (label->vl_vdev_phys.vp_nvlist), config, 0) != 0) 882 continue; 883 884 if (nvlist_lookup_uint64(*config, ZPOOL_CONFIG_POOL_STATE, 885 &state) != 0 || state > POOL_STATE_L2CACHE) { 886 nvlist_free(*config); 887 continue; 888 } 889 890 if (state != POOL_STATE_SPARE && state != POOL_STATE_L2CACHE && 891 (nvlist_lookup_uint64(*config, ZPOOL_CONFIG_POOL_TXG, 892 &txg) != 0 || txg == 0)) { 893 nvlist_free(*config); 894 continue; 895 } 896 897 free(label); 898 return (0); 899 } 900 901 free(label); 902 *config = NULL; 903 return (0); 904} 905 906typedef struct rdsk_node { 907 char *rn_name; 908 int rn_dfd; 909 libzfs_handle_t *rn_hdl; 910 nvlist_t *rn_config; 911 avl_tree_t *rn_avl; 912 avl_node_t rn_node; 913 boolean_t rn_nozpool; 914} rdsk_node_t; 915 916static int 917slice_cache_compare(const void *arg1, const void *arg2) 918{ 919 const char *nm1 = ((rdsk_node_t *)arg1)->rn_name; 920 const char *nm2 = ((rdsk_node_t *)arg2)->rn_name; 921 char *nm1slice, *nm2slice; 922 int rv; 923 924 /* 925 * slices zero and two are the most likely to provide results, 926 * so put those first 927 */ 928 nm1slice = strstr(nm1, "s0"); 929 nm2slice = strstr(nm2, "s0"); 930 if (nm1slice && !nm2slice) { 931 return (-1); 932 } 933 if (!nm1slice && nm2slice) { 934 return (1); 935 } 936 nm1slice = strstr(nm1, "s2"); 937 nm2slice = strstr(nm2, "s2"); 938 if (nm1slice && !nm2slice) { 939 return (-1); 940 } 941 if (!nm1slice && nm2slice) { 942 return (1); 943 } 944 945 rv = strcmp(nm1, nm2); 946 if (rv == 0) 947 return (0); 948 return (rv > 0 ? 1 : -1); 949} 950 951#ifdef sun 952static void 953check_one_slice(avl_tree_t *r, char *diskname, uint_t partno, 954 diskaddr_t size, uint_t blksz) 955{ 956 rdsk_node_t tmpnode; 957 rdsk_node_t *node; 958 char sname[MAXNAMELEN]; 959 960 tmpnode.rn_name = &sname[0]; 961 (void) snprintf(tmpnode.rn_name, MAXNAMELEN, "%s%u", 962 diskname, partno); 963 /* 964 * protect against division by zero for disk labels that 965 * contain a bogus sector size 966 */ 967 if (blksz == 0) 968 blksz = DEV_BSIZE; 969 /* too small to contain a zpool? */ 970 if ((size < (SPA_MINDEVSIZE / blksz)) && 971 (node = avl_find(r, &tmpnode, NULL))) 972 node->rn_nozpool = B_TRUE; 973} 974#endif /* sun */ 975 976static void 977nozpool_all_slices(avl_tree_t *r, const char *sname) 978{ 979#ifdef sun 980 char diskname[MAXNAMELEN]; 981 char *ptr; 982 int i; 983 984 (void) strncpy(diskname, sname, MAXNAMELEN); 985 if (((ptr = strrchr(diskname, 's')) == NULL) && 986 ((ptr = strrchr(diskname, 'p')) == NULL)) 987 return; 988 ptr[0] = 's'; 989 ptr[1] = '\0'; 990 for (i = 0; i < NDKMAP; i++) 991 check_one_slice(r, diskname, i, 0, 1); 992 ptr[0] = 'p'; 993 for (i = 0; i <= FD_NUMPART; i++) 994 check_one_slice(r, diskname, i, 0, 1); 995#endif /* sun */ 996} 997 998static void 999check_slices(avl_tree_t *r, int fd, const char *sname) 1000{ 1001#ifdef sun 1002 struct extvtoc vtoc; 1003 struct dk_gpt *gpt; 1004 char diskname[MAXNAMELEN]; 1005 char *ptr; 1006 int i; 1007 1008 (void) strncpy(diskname, sname, MAXNAMELEN); 1009 if ((ptr = strrchr(diskname, 's')) == NULL || !isdigit(ptr[1])) 1010 return; 1011 ptr[1] = '\0'; 1012 1013 if (read_extvtoc(fd, &vtoc) >= 0) { 1014 for (i = 0; i < NDKMAP; i++) 1015 check_one_slice(r, diskname, i, 1016 vtoc.v_part[i].p_size, vtoc.v_sectorsz); 1017 } else if (efi_alloc_and_read(fd, &gpt) >= 0) { 1018 /* 1019 * on x86 we'll still have leftover links that point 1020 * to slices s[9-15], so use NDKMAP instead 1021 */ 1022 for (i = 0; i < NDKMAP; i++) 1023 check_one_slice(r, diskname, i, 1024 gpt->efi_parts[i].p_size, gpt->efi_lbasize); 1025 /* nodes p[1-4] are never used with EFI labels */ 1026 ptr[0] = 'p'; 1027 for (i = 1; i <= FD_NUMPART; i++) 1028 check_one_slice(r, diskname, i, 0, 1); 1029 efi_free(gpt); 1030 } 1031#endif /* sun */ 1032} 1033 1034static void 1035zpool_open_func(void *arg) 1036{ 1037 rdsk_node_t *rn = arg; 1038 struct stat64 statbuf; 1039 nvlist_t *config; 1040 int fd; 1041 1042 if (rn->rn_nozpool) 1043 return; 1044 if ((fd = openat64(rn->rn_dfd, rn->rn_name, O_RDONLY)) < 0) { 1045 /* symlink to a device that's no longer there */ 1046 if (errno == ENOENT) 1047 nozpool_all_slices(rn->rn_avl, rn->rn_name); 1048 return; 1049 } 1050 /* 1051 * Ignore failed stats. We only want regular 1052 * files, character devs and block devs. 1053 */ 1054 if (fstat64(fd, &statbuf) != 0 || 1055 (!S_ISREG(statbuf.st_mode) && 1056 !S_ISCHR(statbuf.st_mode) && 1057 !S_ISBLK(statbuf.st_mode))) { 1058 (void) close(fd); 1059 return; 1060 } 1061 /* this file is too small to hold a zpool */ 1062 if (S_ISREG(statbuf.st_mode) && 1063 statbuf.st_size < SPA_MINDEVSIZE) { 1064 (void) close(fd); 1065 return; 1066 } else if (!S_ISREG(statbuf.st_mode)) { 1067 /* 1068 * Try to read the disk label first so we don't have to 1069 * open a bunch of minor nodes that can't have a zpool. 1070 */ 1071 check_slices(rn->rn_avl, fd, rn->rn_name); 1072 } 1073 1074 if ((zpool_read_label(fd, &config)) != 0) { 1075 (void) close(fd); 1076 (void) no_memory(rn->rn_hdl); 1077 return; 1078 } 1079 (void) close(fd); 1080 1081 1082 rn->rn_config = config; 1083 if (config != NULL) { 1084 assert(rn->rn_nozpool == B_FALSE); 1085 } 1086} 1087 1088/* 1089 * Given a file descriptor, clear (zero) the label information. This function 1090 * is used in the appliance stack as part of the ZFS sysevent module and 1091 * to implement the "zpool labelclear" command. 1092 */ 1093int 1094zpool_clear_label(int fd) 1095{ 1096 struct stat64 statbuf; 1097 int l; 1098 vdev_label_t *label; 1099 uint64_t size; 1100 1101 if (fstat64(fd, &statbuf) == -1) 1102 return (0); 1103 size = P2ALIGN_TYPED(statbuf.st_size, sizeof (vdev_label_t), uint64_t); 1104 1105 if ((label = calloc(sizeof (vdev_label_t), 1)) == NULL) 1106 return (-1); 1107 1108 for (l = 0; l < VDEV_LABELS; l++) { 1109 if (pwrite64(fd, label, sizeof (vdev_label_t), 1110 label_offset(size, l)) != sizeof (vdev_label_t)) 1111 return (-1); 1112 } 1113 1114 free(label); 1115 return (0); 1116} 1117 1118/* 1119 * Given a list of directories to search, find all pools stored on disk. This 1120 * includes partial pools which are not available to import. If no args are 1121 * given (argc is 0), then the default directory (/dev/dsk) is searched. 1122 * poolname or guid (but not both) are provided by the caller when trying 1123 * to import a specific pool. 1124 */ 1125static nvlist_t * 1126zpool_find_import_impl(libzfs_handle_t *hdl, importargs_t *iarg) 1127{ 1128 int i, dirs = iarg->paths; 1129 DIR *dirp = NULL; 1130 struct dirent64 *dp; 1131 char path[MAXPATHLEN]; 1132 char *end, **dir = iarg->path; 1133 size_t pathleft; 1134 nvlist_t *ret = NULL; 1135 static char *default_dir = "/dev"; 1136 pool_list_t pools = { 0 }; 1137 pool_entry_t *pe, *penext; 1138 vdev_entry_t *ve, *venext; 1139 config_entry_t *ce, *cenext; 1140 name_entry_t *ne, *nenext; 1141 avl_tree_t slice_cache; 1142 rdsk_node_t *slice; 1143 void *cookie; 1144 1145 if (dirs == 0) { 1146 dirs = 1; 1147 dir = &default_dir; 1148 } 1149 1150 /* 1151 * Go through and read the label configuration information from every 1152 * possible device, organizing the information according to pool GUID 1153 * and toplevel GUID. 1154 */ 1155 for (i = 0; i < dirs; i++) { 1156 tpool_t *t; 1157 char *rdsk; 1158 int dfd; 1159 1160 /* use realpath to normalize the path */ 1161 if (realpath(dir[i], path) == 0) { 1162 (void) zfs_error_fmt(hdl, EZFS_BADPATH, 1163 dgettext(TEXT_DOMAIN, "cannot open '%s'"), dir[i]); 1164 goto error; 1165 } 1166 end = &path[strlen(path)]; 1167 *end++ = '/'; 1168 *end = 0; 1169 pathleft = &path[sizeof (path)] - end; 1170 1171 /* 1172 * Using raw devices instead of block devices when we're 1173 * reading the labels skips a bunch of slow operations during 1174 * close(2) processing, so we replace /dev/dsk with /dev/rdsk. 1175 */ 1176 if (strcmp(path, "/dev/dsk/") == 0) 1177 rdsk = "/dev/"; 1178 else 1179 rdsk = path; 1180 1181 if ((dfd = open64(rdsk, O_RDONLY)) < 0 || 1182 (dirp = fdopendir(dfd)) == NULL) { 1183 zfs_error_aux(hdl, strerror(errno)); 1184 (void) zfs_error_fmt(hdl, EZFS_BADPATH, 1185 dgettext(TEXT_DOMAIN, "cannot open '%s'"), 1186 rdsk); 1187 goto error; 1188 } 1189 1190 avl_create(&slice_cache, slice_cache_compare, 1191 sizeof (rdsk_node_t), offsetof(rdsk_node_t, rn_node)); 1192 1193 if (strcmp(rdsk, "/dev/") == 0) { 1194 struct gmesh mesh; 1195 struct gclass *mp; 1196 struct ggeom *gp; 1197 struct gprovider *pp; 1198 1199 errno = geom_gettree(&mesh); 1200 if (errno != 0) { 1201 zfs_error_aux(hdl, strerror(errno)); 1202 (void) zfs_error_fmt(hdl, EZFS_BADPATH, 1203 dgettext(TEXT_DOMAIN, "cannot get GEOM tree")); 1204 goto error; 1205 } 1206 1207 LIST_FOREACH(mp, &mesh.lg_class, lg_class) { 1208 LIST_FOREACH(gp, &mp->lg_geom, lg_geom) { 1209 LIST_FOREACH(pp, &gp->lg_provider, lg_provider) { 1210 slice = zfs_alloc(hdl, sizeof (rdsk_node_t)); 1211 slice->rn_name = zfs_strdup(hdl, pp->lg_name); 1212 slice->rn_avl = &slice_cache; 1213 slice->rn_dfd = dfd; 1214 slice->rn_hdl = hdl; 1215 slice->rn_nozpool = B_FALSE; 1216 avl_add(&slice_cache, slice); 1217 } 1218 } 1219 } 1220 1221 geom_deletetree(&mesh); 1222 goto skipdir; 1223 } 1224 1225 /* 1226 * This is not MT-safe, but we have no MT consumers of libzfs 1227 */ 1228 while ((dp = readdir64(dirp)) != NULL) { 1229 const char *name = dp->d_name; 1230 if (name[0] == '.' && 1231 (name[1] == 0 || (name[1] == '.' && name[2] == 0))) 1232 continue; 1233 1234 slice = zfs_alloc(hdl, sizeof (rdsk_node_t)); 1235 slice->rn_name = zfs_strdup(hdl, name); 1236 slice->rn_avl = &slice_cache; 1237 slice->rn_dfd = dfd; 1238 slice->rn_hdl = hdl; 1239 slice->rn_nozpool = B_FALSE; 1240 avl_add(&slice_cache, slice); 1241 } 1242skipdir: 1243 /* 1244 * create a thread pool to do all of this in parallel; 1245 * rn_nozpool is not protected, so this is racy in that 1246 * multiple tasks could decide that the same slice can 1247 * not hold a zpool, which is benign. Also choose 1248 * double the number of processors; we hold a lot of 1249 * locks in the kernel, so going beyond this doesn't 1250 * buy us much. 1251 */ 1252 t = tpool_create(1, 2 * sysconf(_SC_NPROCESSORS_ONLN), 1253 0, NULL); 1254 for (slice = avl_first(&slice_cache); slice; 1255 (slice = avl_walk(&slice_cache, slice, 1256 AVL_AFTER))) 1257 (void) tpool_dispatch(t, zpool_open_func, slice); 1258 tpool_wait(t); 1259 tpool_destroy(t); 1260 1261 cookie = NULL; 1262 while ((slice = avl_destroy_nodes(&slice_cache, 1263 &cookie)) != NULL) { 1264 if (slice->rn_config != NULL) { 1265 nvlist_t *config = slice->rn_config; 1266 boolean_t matched = B_TRUE; 1267 1268 if (iarg->poolname != NULL) { 1269 char *pname; 1270 1271 matched = nvlist_lookup_string(config, 1272 ZPOOL_CONFIG_POOL_NAME, 1273 &pname) == 0 && 1274 strcmp(iarg->poolname, pname) == 0; 1275 } else if (iarg->guid != 0) { 1276 uint64_t this_guid; 1277 1278 matched = nvlist_lookup_uint64(config, 1279 ZPOOL_CONFIG_POOL_GUID, 1280 &this_guid) == 0 && 1281 iarg->guid == this_guid; 1282 } 1283 if (!matched) { 1284 nvlist_free(config); 1285 config = NULL; 1286 continue; 1287 } 1288 /* use the non-raw path for the config */ 1289 (void) strlcpy(end, slice->rn_name, pathleft); 1290 if (add_config(hdl, &pools, path, config) != 0) 1291 goto error; 1292 } 1293 free(slice->rn_name); 1294 free(slice); 1295 } 1296 avl_destroy(&slice_cache); 1297 1298 (void) closedir(dirp); 1299 dirp = NULL; 1300 } 1301 1302 ret = get_configs(hdl, &pools, iarg->can_be_active); 1303 1304error: 1305 for (pe = pools.pools; pe != NULL; pe = penext) { 1306 penext = pe->pe_next; 1307 for (ve = pe->pe_vdevs; ve != NULL; ve = venext) { 1308 venext = ve->ve_next; 1309 for (ce = ve->ve_configs; ce != NULL; ce = cenext) { 1310 cenext = ce->ce_next; 1311 if (ce->ce_config) 1312 nvlist_free(ce->ce_config); 1313 free(ce); 1314 } 1315 free(ve); 1316 } 1317 free(pe); 1318 } 1319 1320 for (ne = pools.names; ne != NULL; ne = nenext) { 1321 nenext = ne->ne_next; 1322 if (ne->ne_name) 1323 free(ne->ne_name); 1324 free(ne); 1325 } 1326 1327 if (dirp) 1328 (void) closedir(dirp); 1329 1330 return (ret); 1331} 1332 1333nvlist_t * 1334zpool_find_import(libzfs_handle_t *hdl, int argc, char **argv) 1335{ 1336 importargs_t iarg = { 0 }; 1337 1338 iarg.paths = argc; 1339 iarg.path = argv; 1340 1341 return (zpool_find_import_impl(hdl, &iarg)); 1342} 1343 1344/* 1345 * Given a cache file, return the contents as a list of importable pools. 1346 * poolname or guid (but not both) are provided by the caller when trying 1347 * to import a specific pool. 1348 */ 1349nvlist_t * 1350zpool_find_import_cached(libzfs_handle_t *hdl, const char *cachefile, 1351 char *poolname, uint64_t guid) 1352{ 1353 char *buf; 1354 int fd; 1355 struct stat64 statbuf; 1356 nvlist_t *raw, *src, *dst; 1357 nvlist_t *pools; 1358 nvpair_t *elem; 1359 char *name; 1360 uint64_t this_guid; 1361 boolean_t active; 1362 1363 verify(poolname == NULL || guid == 0); 1364 1365 if ((fd = open(cachefile, O_RDONLY)) < 0) { 1366 zfs_error_aux(hdl, "%s", strerror(errno)); 1367 (void) zfs_error(hdl, EZFS_BADCACHE, 1368 dgettext(TEXT_DOMAIN, "failed to open cache file")); 1369 return (NULL); 1370 } 1371 1372 if (fstat64(fd, &statbuf) != 0) { 1373 zfs_error_aux(hdl, "%s", strerror(errno)); 1374 (void) close(fd); 1375 (void) zfs_error(hdl, EZFS_BADCACHE, 1376 dgettext(TEXT_DOMAIN, "failed to get size of cache file")); 1377 return (NULL); 1378 } 1379 1380 if ((buf = zfs_alloc(hdl, statbuf.st_size)) == NULL) { 1381 (void) close(fd); 1382 return (NULL); 1383 } 1384 1385 if (read(fd, buf, statbuf.st_size) != statbuf.st_size) { 1386 (void) close(fd); 1387 free(buf); 1388 (void) zfs_error(hdl, EZFS_BADCACHE, 1389 dgettext(TEXT_DOMAIN, 1390 "failed to read cache file contents")); 1391 return (NULL); 1392 } 1393 1394 (void) close(fd); 1395 1396 if (nvlist_unpack(buf, statbuf.st_size, &raw, 0) != 0) { 1397 free(buf); 1398 (void) zfs_error(hdl, EZFS_BADCACHE, 1399 dgettext(TEXT_DOMAIN, 1400 "invalid or corrupt cache file contents")); 1401 return (NULL); 1402 } 1403 1404 free(buf); 1405 1406 /* 1407 * Go through and get the current state of the pools and refresh their 1408 * state. 1409 */ 1410 if (nvlist_alloc(&pools, 0, 0) != 0) { 1411 (void) no_memory(hdl); 1412 nvlist_free(raw); 1413 return (NULL); 1414 } 1415 1416 elem = NULL; 1417 while ((elem = nvlist_next_nvpair(raw, elem)) != NULL) { 1418 verify(nvpair_value_nvlist(elem, &src) == 0); 1419 1420 verify(nvlist_lookup_string(src, ZPOOL_CONFIG_POOL_NAME, 1421 &name) == 0); 1422 if (poolname != NULL && strcmp(poolname, name) != 0) 1423 continue; 1424 1425 verify(nvlist_lookup_uint64(src, ZPOOL_CONFIG_POOL_GUID, 1426 &this_guid) == 0); 1427 if (guid != 0) { 1428 verify(nvlist_lookup_uint64(src, ZPOOL_CONFIG_POOL_GUID, 1429 &this_guid) == 0); 1430 if (guid != this_guid) 1431 continue; 1432 } 1433 1434 if (pool_active(hdl, name, this_guid, &active) != 0) { 1435 nvlist_free(raw); 1436 nvlist_free(pools); 1437 return (NULL); 1438 } 1439 1440 if (active) 1441 continue; 1442 1443 if ((dst = refresh_config(hdl, src)) == NULL) { 1444 nvlist_free(raw); 1445 nvlist_free(pools); 1446 return (NULL); 1447 } 1448 1449 if (nvlist_add_nvlist(pools, nvpair_name(elem), dst) != 0) { 1450 (void) no_memory(hdl); 1451 nvlist_free(dst); 1452 nvlist_free(raw); 1453 nvlist_free(pools); 1454 return (NULL); 1455 } 1456 nvlist_free(dst); 1457 } 1458 1459 nvlist_free(raw); 1460 return (pools); 1461} 1462 1463static int 1464name_or_guid_exists(zpool_handle_t *zhp, void *data) 1465{ 1466 importargs_t *import = data; 1467 int found = 0; 1468 1469 if (import->poolname != NULL) { 1470 char *pool_name; 1471 1472 verify(nvlist_lookup_string(zhp->zpool_config, 1473 ZPOOL_CONFIG_POOL_NAME, &pool_name) == 0); 1474 if (strcmp(pool_name, import->poolname) == 0) 1475 found = 1; 1476 } else { 1477 uint64_t pool_guid; 1478 1479 verify(nvlist_lookup_uint64(zhp->zpool_config, 1480 ZPOOL_CONFIG_POOL_GUID, &pool_guid) == 0); 1481 if (pool_guid == import->guid) 1482 found = 1; 1483 } 1484 1485 zpool_close(zhp); 1486 return (found); 1487} 1488 1489nvlist_t * 1490zpool_search_import(libzfs_handle_t *hdl, importargs_t *import) 1491{ 1492 verify(import->poolname == NULL || import->guid == 0); 1493 1494 if (import->unique) 1495 import->exists = zpool_iter(hdl, name_or_guid_exists, import); 1496 1497 if (import->cachefile != NULL) 1498 return (zpool_find_import_cached(hdl, import->cachefile, 1499 import->poolname, import->guid)); 1500 1501 return (zpool_find_import_impl(hdl, import)); 1502} 1503 1504boolean_t 1505find_guid(nvlist_t *nv, uint64_t guid) 1506{ 1507 uint64_t tmp; 1508 nvlist_t **child; 1509 uint_t c, children; 1510 1511 verify(nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID, &tmp) == 0); 1512 if (tmp == guid) 1513 return (B_TRUE); 1514 1515 if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_CHILDREN, 1516 &child, &children) == 0) { 1517 for (c = 0; c < children; c++) 1518 if (find_guid(child[c], guid)) 1519 return (B_TRUE); 1520 } 1521 1522 return (B_FALSE); 1523} 1524 1525typedef struct aux_cbdata { 1526 const char *cb_type; 1527 uint64_t cb_guid; 1528 zpool_handle_t *cb_zhp; 1529} aux_cbdata_t; 1530 1531static int 1532find_aux(zpool_handle_t *zhp, void *data) 1533{ 1534 aux_cbdata_t *cbp = data; 1535 nvlist_t **list; 1536 uint_t i, count; 1537 uint64_t guid; 1538 nvlist_t *nvroot; 1539 1540 verify(nvlist_lookup_nvlist(zhp->zpool_config, ZPOOL_CONFIG_VDEV_TREE, 1541 &nvroot) == 0); 1542 1543 if (nvlist_lookup_nvlist_array(nvroot, cbp->cb_type, 1544 &list, &count) == 0) { 1545 for (i = 0; i < count; i++) { 1546 verify(nvlist_lookup_uint64(list[i], 1547 ZPOOL_CONFIG_GUID, &guid) == 0); 1548 if (guid == cbp->cb_guid) { 1549 cbp->cb_zhp = zhp; 1550 return (1); 1551 } 1552 } 1553 } 1554 1555 zpool_close(zhp); 1556 return (0); 1557} 1558 1559/* 1560 * Determines if the pool is in use. If so, it returns true and the state of 1561 * the pool as well as the name of the pool. Both strings are allocated and 1562 * must be freed by the caller. 1563 */ 1564int 1565zpool_in_use(libzfs_handle_t *hdl, int fd, pool_state_t *state, char **namestr, 1566 boolean_t *inuse) 1567{ 1568 nvlist_t *config; 1569 char *name; 1570 boolean_t ret; 1571 uint64_t guid, vdev_guid; 1572 zpool_handle_t *zhp; 1573 nvlist_t *pool_config; 1574 uint64_t stateval, isspare; 1575 aux_cbdata_t cb = { 0 }; 1576 boolean_t isactive; 1577 1578 *inuse = B_FALSE; 1579 1580 if (zpool_read_label(fd, &config) != 0) { 1581 (void) no_memory(hdl); 1582 return (-1); 1583 } 1584 1585 if (config == NULL) 1586 return (0); 1587 1588 verify(nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_STATE, 1589 &stateval) == 0); 1590 verify(nvlist_lookup_uint64(config, ZPOOL_CONFIG_GUID, 1591 &vdev_guid) == 0); 1592 1593 if (stateval != POOL_STATE_SPARE && stateval != POOL_STATE_L2CACHE) { 1594 verify(nvlist_lookup_string(config, ZPOOL_CONFIG_POOL_NAME, 1595 &name) == 0); 1596 verify(nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_GUID, 1597 &guid) == 0); 1598 } 1599 1600 switch (stateval) { 1601 case POOL_STATE_EXPORTED: 1602 /* 1603 * A pool with an exported state may in fact be imported 1604 * read-only, so check the in-core state to see if it's 1605 * active and imported read-only. If it is, set 1606 * its state to active. 1607 */ 1608 if (pool_active(hdl, name, guid, &isactive) == 0 && isactive && 1609 (zhp = zpool_open_canfail(hdl, name)) != NULL && 1610 zpool_get_prop_int(zhp, ZPOOL_PROP_READONLY, NULL)) 1611 stateval = POOL_STATE_ACTIVE; 1612 1613 ret = B_TRUE; 1614 break; 1615 1616 case POOL_STATE_ACTIVE: 1617 /* 1618 * For an active pool, we have to determine if it's really part 1619 * of a currently active pool (in which case the pool will exist 1620 * and the guid will be the same), or whether it's part of an 1621 * active pool that was disconnected without being explicitly 1622 * exported. 1623 */ 1624 if (pool_active(hdl, name, guid, &isactive) != 0) { 1625 nvlist_free(config); 1626 return (-1); 1627 } 1628 1629 if (isactive) { 1630 /* 1631 * Because the device may have been removed while 1632 * offlined, we only report it as active if the vdev is 1633 * still present in the config. Otherwise, pretend like 1634 * it's not in use. 1635 */ 1636 if ((zhp = zpool_open_canfail(hdl, name)) != NULL && 1637 (pool_config = zpool_get_config(zhp, NULL)) 1638 != NULL) { 1639 nvlist_t *nvroot; 1640 1641 verify(nvlist_lookup_nvlist(pool_config, 1642 ZPOOL_CONFIG_VDEV_TREE, &nvroot) == 0); 1643 ret = find_guid(nvroot, vdev_guid); 1644 } else { 1645 ret = B_FALSE; 1646 } 1647 1648 /* 1649 * If this is an active spare within another pool, we 1650 * treat it like an unused hot spare. This allows the 1651 * user to create a pool with a hot spare that currently 1652 * in use within another pool. Since we return B_TRUE, 1653 * libdiskmgt will continue to prevent generic consumers 1654 * from using the device. 1655 */ 1656 if (ret && nvlist_lookup_uint64(config, 1657 ZPOOL_CONFIG_IS_SPARE, &isspare) == 0 && isspare) 1658 stateval = POOL_STATE_SPARE; 1659 1660 if (zhp != NULL) 1661 zpool_close(zhp); 1662 } else { 1663 stateval = POOL_STATE_POTENTIALLY_ACTIVE; 1664 ret = B_TRUE; 1665 } 1666 break; 1667 1668 case POOL_STATE_SPARE: 1669 /* 1670 * For a hot spare, it can be either definitively in use, or 1671 * potentially active. To determine if it's in use, we iterate 1672 * over all pools in the system and search for one with a spare 1673 * with a matching guid. 1674 * 1675 * Due to the shared nature of spares, we don't actually report 1676 * the potentially active case as in use. This means the user 1677 * can freely create pools on the hot spares of exported pools, 1678 * but to do otherwise makes the resulting code complicated, and 1679 * we end up having to deal with this case anyway. 1680 */ 1681 cb.cb_zhp = NULL; 1682 cb.cb_guid = vdev_guid; 1683 cb.cb_type = ZPOOL_CONFIG_SPARES; 1684 if (zpool_iter(hdl, find_aux, &cb) == 1) { 1685 name = (char *)zpool_get_name(cb.cb_zhp); 1686 ret = TRUE; 1687 } else { 1688 ret = FALSE; 1689 } 1690 break; 1691 1692 case POOL_STATE_L2CACHE: 1693 1694 /* 1695 * Check if any pool is currently using this l2cache device. 1696 */ 1697 cb.cb_zhp = NULL; 1698 cb.cb_guid = vdev_guid; 1699 cb.cb_type = ZPOOL_CONFIG_L2CACHE; 1700 if (zpool_iter(hdl, find_aux, &cb) == 1) { 1701 name = (char *)zpool_get_name(cb.cb_zhp); 1702 ret = TRUE; 1703 } else { 1704 ret = FALSE; 1705 } 1706 break; 1707 1708 default: 1709 ret = B_FALSE; 1710 } 1711 1712 1713 if (ret) { 1714 if ((*namestr = zfs_strdup(hdl, name)) == NULL) { 1715 if (cb.cb_zhp) 1716 zpool_close(cb.cb_zhp); 1717 nvlist_free(config); 1718 return (-1); 1719 } 1720 *state = (pool_state_t)stateval; 1721 } 1722 1723 if (cb.cb_zhp) 1724 zpool_close(cb.cb_zhp); 1725 1726 nvlist_free(config); 1727 *inuse = ret; 1728 return (0); 1729} 1730