zfsimpl.c revision 268649
1/*- 2 * Copyright (c) 2007 Doug Rabson 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27#include <sys/cdefs.h> 28__FBSDID("$FreeBSD: stable/10/sys/boot/zfs/zfsimpl.c 268649 2014-07-15 04:53:34Z delphij $"); 29 30/* 31 * Stand-alone ZFS file reader. 32 */ 33 34#include <sys/stat.h> 35#include <sys/stdint.h> 36 37#include "zfsimpl.h" 38#include "zfssubr.c" 39 40 41struct zfsmount { 42 const spa_t *spa; 43 objset_phys_t objset; 44 uint64_t rootobj; 45}; 46 47/* 48 * List of all vdevs, chained through v_alllink. 49 */ 50static vdev_list_t zfs_vdevs; 51 52 /* 53 * List of ZFS features supported for read 54 */ 55static const char *features_for_read[] = { 56 "org.illumos:lz4_compress", 57 "com.delphix:hole_birth", 58 "com.delphix:extensible_dataset", 59 "com.delphix:embedded_data", 60 NULL 61}; 62 63/* 64 * List of all pools, chained through spa_link. 65 */ 66static spa_list_t zfs_pools; 67 68static uint64_t zfs_crc64_table[256]; 69static const dnode_phys_t *dnode_cache_obj = 0; 70static uint64_t dnode_cache_bn; 71static char *dnode_cache_buf; 72static char *zap_scratch; 73static char *zfs_temp_buf, *zfs_temp_end, *zfs_temp_ptr; 74 75#define TEMP_SIZE (1024 * 1024) 76 77static int zio_read(const spa_t *spa, const blkptr_t *bp, void *buf); 78static int zfs_get_root(const spa_t *spa, uint64_t *objid); 79static int zfs_rlookup(const spa_t *spa, uint64_t objnum, char *result); 80 81static void 82zfs_init(void) 83{ 84 STAILQ_INIT(&zfs_vdevs); 85 STAILQ_INIT(&zfs_pools); 86 87 zfs_temp_buf = malloc(TEMP_SIZE); 88 zfs_temp_end = zfs_temp_buf + TEMP_SIZE; 89 zfs_temp_ptr = zfs_temp_buf; 90 dnode_cache_buf = malloc(SPA_MAXBLOCKSIZE); 91 zap_scratch = malloc(SPA_MAXBLOCKSIZE); 92 93 zfs_init_crc(); 94} 95 96static void * 97zfs_alloc(size_t size) 98{ 99 char *ptr; 100 101 if (zfs_temp_ptr + size > zfs_temp_end) { 102 printf("ZFS: out of temporary buffer space\n"); 103 for (;;) ; 104 } 105 ptr = zfs_temp_ptr; 106 zfs_temp_ptr += size; 107 108 return (ptr); 109} 110 111static void 112zfs_free(void *ptr, size_t size) 113{ 114 115 zfs_temp_ptr -= size; 116 if (zfs_temp_ptr != ptr) { 117 printf("ZFS: zfs_alloc()/zfs_free() mismatch\n"); 118 for (;;) ; 119 } 120} 121 122static int 123xdr_int(const unsigned char **xdr, int *ip) 124{ 125 *ip = ((*xdr)[0] << 24) 126 | ((*xdr)[1] << 16) 127 | ((*xdr)[2] << 8) 128 | ((*xdr)[3] << 0); 129 (*xdr) += 4; 130 return (0); 131} 132 133static int 134xdr_u_int(const unsigned char **xdr, u_int *ip) 135{ 136 *ip = ((*xdr)[0] << 24) 137 | ((*xdr)[1] << 16) 138 | ((*xdr)[2] << 8) 139 | ((*xdr)[3] << 0); 140 (*xdr) += 4; 141 return (0); 142} 143 144static int 145xdr_uint64_t(const unsigned char **xdr, uint64_t *lp) 146{ 147 u_int hi, lo; 148 149 xdr_u_int(xdr, &hi); 150 xdr_u_int(xdr, &lo); 151 *lp = (((uint64_t) hi) << 32) | lo; 152 return (0); 153} 154 155static int 156nvlist_find(const unsigned char *nvlist, const char *name, int type, 157 int* elementsp, void *valuep) 158{ 159 const unsigned char *p, *pair; 160 int junk; 161 int encoded_size, decoded_size; 162 163 p = nvlist; 164 xdr_int(&p, &junk); 165 xdr_int(&p, &junk); 166 167 pair = p; 168 xdr_int(&p, &encoded_size); 169 xdr_int(&p, &decoded_size); 170 while (encoded_size && decoded_size) { 171 int namelen, pairtype, elements; 172 const char *pairname; 173 174 xdr_int(&p, &namelen); 175 pairname = (const char*) p; 176 p += roundup(namelen, 4); 177 xdr_int(&p, &pairtype); 178 179 if (!memcmp(name, pairname, namelen) && type == pairtype) { 180 xdr_int(&p, &elements); 181 if (elementsp) 182 *elementsp = elements; 183 if (type == DATA_TYPE_UINT64) { 184 xdr_uint64_t(&p, (uint64_t *) valuep); 185 return (0); 186 } else if (type == DATA_TYPE_STRING) { 187 int len; 188 xdr_int(&p, &len); 189 (*(const char**) valuep) = (const char*) p; 190 return (0); 191 } else if (type == DATA_TYPE_NVLIST 192 || type == DATA_TYPE_NVLIST_ARRAY) { 193 (*(const unsigned char**) valuep) = 194 (const unsigned char*) p; 195 return (0); 196 } else { 197 return (EIO); 198 } 199 } else { 200 /* 201 * Not the pair we are looking for, skip to the next one. 202 */ 203 p = pair + encoded_size; 204 } 205 206 pair = p; 207 xdr_int(&p, &encoded_size); 208 xdr_int(&p, &decoded_size); 209 } 210 211 return (EIO); 212} 213 214static int 215nvlist_check_features_for_read(const unsigned char *nvlist) 216{ 217 const unsigned char *p, *pair; 218 int junk; 219 int encoded_size, decoded_size; 220 int rc; 221 222 rc = 0; 223 224 p = nvlist; 225 xdr_int(&p, &junk); 226 xdr_int(&p, &junk); 227 228 pair = p; 229 xdr_int(&p, &encoded_size); 230 xdr_int(&p, &decoded_size); 231 while (encoded_size && decoded_size) { 232 int namelen, pairtype; 233 const char *pairname; 234 int i, found; 235 236 found = 0; 237 238 xdr_int(&p, &namelen); 239 pairname = (const char*) p; 240 p += roundup(namelen, 4); 241 xdr_int(&p, &pairtype); 242 243 for (i = 0; features_for_read[i] != NULL; i++) { 244 if (!memcmp(pairname, features_for_read[i], namelen)) { 245 found = 1; 246 break; 247 } 248 } 249 250 if (!found) { 251 printf("ZFS: unsupported feature: %s\n", pairname); 252 rc = EIO; 253 } 254 255 p = pair + encoded_size; 256 257 pair = p; 258 xdr_int(&p, &encoded_size); 259 xdr_int(&p, &decoded_size); 260 } 261 262 return (rc); 263} 264 265/* 266 * Return the next nvlist in an nvlist array. 267 */ 268static const unsigned char * 269nvlist_next(const unsigned char *nvlist) 270{ 271 const unsigned char *p, *pair; 272 int junk; 273 int encoded_size, decoded_size; 274 275 p = nvlist; 276 xdr_int(&p, &junk); 277 xdr_int(&p, &junk); 278 279 pair = p; 280 xdr_int(&p, &encoded_size); 281 xdr_int(&p, &decoded_size); 282 while (encoded_size && decoded_size) { 283 p = pair + encoded_size; 284 285 pair = p; 286 xdr_int(&p, &encoded_size); 287 xdr_int(&p, &decoded_size); 288 } 289 290 return p; 291} 292 293#ifdef TEST 294 295static const unsigned char * 296nvlist_print(const unsigned char *nvlist, unsigned int indent) 297{ 298 static const char* typenames[] = { 299 "DATA_TYPE_UNKNOWN", 300 "DATA_TYPE_BOOLEAN", 301 "DATA_TYPE_BYTE", 302 "DATA_TYPE_INT16", 303 "DATA_TYPE_UINT16", 304 "DATA_TYPE_INT32", 305 "DATA_TYPE_UINT32", 306 "DATA_TYPE_INT64", 307 "DATA_TYPE_UINT64", 308 "DATA_TYPE_STRING", 309 "DATA_TYPE_BYTE_ARRAY", 310 "DATA_TYPE_INT16_ARRAY", 311 "DATA_TYPE_UINT16_ARRAY", 312 "DATA_TYPE_INT32_ARRAY", 313 "DATA_TYPE_UINT32_ARRAY", 314 "DATA_TYPE_INT64_ARRAY", 315 "DATA_TYPE_UINT64_ARRAY", 316 "DATA_TYPE_STRING_ARRAY", 317 "DATA_TYPE_HRTIME", 318 "DATA_TYPE_NVLIST", 319 "DATA_TYPE_NVLIST_ARRAY", 320 "DATA_TYPE_BOOLEAN_VALUE", 321 "DATA_TYPE_INT8", 322 "DATA_TYPE_UINT8", 323 "DATA_TYPE_BOOLEAN_ARRAY", 324 "DATA_TYPE_INT8_ARRAY", 325 "DATA_TYPE_UINT8_ARRAY" 326 }; 327 328 unsigned int i, j; 329 const unsigned char *p, *pair; 330 int junk; 331 int encoded_size, decoded_size; 332 333 p = nvlist; 334 xdr_int(&p, &junk); 335 xdr_int(&p, &junk); 336 337 pair = p; 338 xdr_int(&p, &encoded_size); 339 xdr_int(&p, &decoded_size); 340 while (encoded_size && decoded_size) { 341 int namelen, pairtype, elements; 342 const char *pairname; 343 344 xdr_int(&p, &namelen); 345 pairname = (const char*) p; 346 p += roundup(namelen, 4); 347 xdr_int(&p, &pairtype); 348 349 for (i = 0; i < indent; i++) 350 printf(" "); 351 printf("%s %s", typenames[pairtype], pairname); 352 353 xdr_int(&p, &elements); 354 switch (pairtype) { 355 case DATA_TYPE_UINT64: { 356 uint64_t val; 357 xdr_uint64_t(&p, &val); 358 printf(" = 0x%jx\n", (uintmax_t)val); 359 break; 360 } 361 362 case DATA_TYPE_STRING: { 363 int len; 364 xdr_int(&p, &len); 365 printf(" = \"%s\"\n", p); 366 break; 367 } 368 369 case DATA_TYPE_NVLIST: 370 printf("\n"); 371 nvlist_print(p, indent + 1); 372 break; 373 374 case DATA_TYPE_NVLIST_ARRAY: 375 for (j = 0; j < elements; j++) { 376 printf("[%d]\n", j); 377 p = nvlist_print(p, indent + 1); 378 if (j != elements - 1) { 379 for (i = 0; i < indent; i++) 380 printf(" "); 381 printf("%s %s", typenames[pairtype], pairname); 382 } 383 } 384 break; 385 386 default: 387 printf("\n"); 388 } 389 390 p = pair + encoded_size; 391 392 pair = p; 393 xdr_int(&p, &encoded_size); 394 xdr_int(&p, &decoded_size); 395 } 396 397 return p; 398} 399 400#endif 401 402static int 403vdev_read_phys(vdev_t *vdev, const blkptr_t *bp, void *buf, 404 off_t offset, size_t size) 405{ 406 size_t psize; 407 int rc; 408 409 if (!vdev->v_phys_read) 410 return (EIO); 411 412 if (bp) { 413 psize = BP_GET_PSIZE(bp); 414 } else { 415 psize = size; 416 } 417 418 /*printf("ZFS: reading %d bytes at 0x%jx to %p\n", psize, (uintmax_t)offset, buf);*/ 419 rc = vdev->v_phys_read(vdev, vdev->v_read_priv, offset, buf, psize); 420 if (rc) 421 return (rc); 422 if (bp && zio_checksum_verify(bp, buf)) 423 return (EIO); 424 425 return (0); 426} 427 428static int 429vdev_disk_read(vdev_t *vdev, const blkptr_t *bp, void *buf, 430 off_t offset, size_t bytes) 431{ 432 433 return (vdev_read_phys(vdev, bp, buf, 434 offset + VDEV_LABEL_START_SIZE, bytes)); 435} 436 437 438static int 439vdev_mirror_read(vdev_t *vdev, const blkptr_t *bp, void *buf, 440 off_t offset, size_t bytes) 441{ 442 vdev_t *kid; 443 int rc; 444 445 rc = EIO; 446 STAILQ_FOREACH(kid, &vdev->v_children, v_childlink) { 447 if (kid->v_state != VDEV_STATE_HEALTHY) 448 continue; 449 rc = kid->v_read(kid, bp, buf, offset, bytes); 450 if (!rc) 451 return (0); 452 } 453 454 return (rc); 455} 456 457static int 458vdev_replacing_read(vdev_t *vdev, const blkptr_t *bp, void *buf, 459 off_t offset, size_t bytes) 460{ 461 vdev_t *kid; 462 463 /* 464 * Here we should have two kids: 465 * First one which is the one we are replacing and we can trust 466 * only this one to have valid data, but it might not be present. 467 * Second one is that one we are replacing with. It is most likely 468 * healthy, but we can't trust it has needed data, so we won't use it. 469 */ 470 kid = STAILQ_FIRST(&vdev->v_children); 471 if (kid == NULL) 472 return (EIO); 473 if (kid->v_state != VDEV_STATE_HEALTHY) 474 return (EIO); 475 return (kid->v_read(kid, bp, buf, offset, bytes)); 476} 477 478static vdev_t * 479vdev_find(uint64_t guid) 480{ 481 vdev_t *vdev; 482 483 STAILQ_FOREACH(vdev, &zfs_vdevs, v_alllink) 484 if (vdev->v_guid == guid) 485 return (vdev); 486 487 return (0); 488} 489 490static vdev_t * 491vdev_create(uint64_t guid, vdev_read_t *read) 492{ 493 vdev_t *vdev; 494 495 vdev = malloc(sizeof(vdev_t)); 496 memset(vdev, 0, sizeof(vdev_t)); 497 STAILQ_INIT(&vdev->v_children); 498 vdev->v_guid = guid; 499 vdev->v_state = VDEV_STATE_OFFLINE; 500 vdev->v_read = read; 501 vdev->v_phys_read = 0; 502 vdev->v_read_priv = 0; 503 STAILQ_INSERT_TAIL(&zfs_vdevs, vdev, v_alllink); 504 505 return (vdev); 506} 507 508static int 509vdev_init_from_nvlist(const unsigned char *nvlist, vdev_t *pvdev, 510 vdev_t **vdevp, int is_newer) 511{ 512 int rc; 513 uint64_t guid, id, ashift, nparity; 514 const char *type; 515 const char *path; 516 vdev_t *vdev, *kid; 517 const unsigned char *kids; 518 int nkids, i, is_new; 519 uint64_t is_offline, is_faulted, is_degraded, is_removed, isnt_present; 520 521 if (nvlist_find(nvlist, ZPOOL_CONFIG_GUID, 522 DATA_TYPE_UINT64, 0, &guid) 523 || nvlist_find(nvlist, ZPOOL_CONFIG_ID, 524 DATA_TYPE_UINT64, 0, &id) 525 || nvlist_find(nvlist, ZPOOL_CONFIG_TYPE, 526 DATA_TYPE_STRING, 0, &type)) { 527 printf("ZFS: can't find vdev details\n"); 528 return (ENOENT); 529 } 530 531 if (strcmp(type, VDEV_TYPE_MIRROR) 532 && strcmp(type, VDEV_TYPE_DISK) 533#ifdef ZFS_TEST 534 && strcmp(type, VDEV_TYPE_FILE) 535#endif 536 && strcmp(type, VDEV_TYPE_RAIDZ) 537 && strcmp(type, VDEV_TYPE_REPLACING)) { 538 printf("ZFS: can only boot from disk, mirror, raidz1, raidz2 and raidz3 vdevs\n"); 539 return (EIO); 540 } 541 542 is_offline = is_removed = is_faulted = is_degraded = isnt_present = 0; 543 544 nvlist_find(nvlist, ZPOOL_CONFIG_OFFLINE, DATA_TYPE_UINT64, 0, 545 &is_offline); 546 nvlist_find(nvlist, ZPOOL_CONFIG_REMOVED, DATA_TYPE_UINT64, 0, 547 &is_removed); 548 nvlist_find(nvlist, ZPOOL_CONFIG_FAULTED, DATA_TYPE_UINT64, 0, 549 &is_faulted); 550 nvlist_find(nvlist, ZPOOL_CONFIG_DEGRADED, DATA_TYPE_UINT64, 0, 551 &is_degraded); 552 nvlist_find(nvlist, ZPOOL_CONFIG_NOT_PRESENT, DATA_TYPE_UINT64, 0, 553 &isnt_present); 554 555 vdev = vdev_find(guid); 556 if (!vdev) { 557 is_new = 1; 558 559 if (!strcmp(type, VDEV_TYPE_MIRROR)) 560 vdev = vdev_create(guid, vdev_mirror_read); 561 else if (!strcmp(type, VDEV_TYPE_RAIDZ)) 562 vdev = vdev_create(guid, vdev_raidz_read); 563 else if (!strcmp(type, VDEV_TYPE_REPLACING)) 564 vdev = vdev_create(guid, vdev_replacing_read); 565 else 566 vdev = vdev_create(guid, vdev_disk_read); 567 568 vdev->v_id = id; 569 vdev->v_top = pvdev != NULL ? pvdev : vdev; 570 if (nvlist_find(nvlist, ZPOOL_CONFIG_ASHIFT, 571 DATA_TYPE_UINT64, 0, &ashift) == 0) 572 vdev->v_ashift = ashift; 573 else 574 vdev->v_ashift = 0; 575 if (nvlist_find(nvlist, ZPOOL_CONFIG_NPARITY, 576 DATA_TYPE_UINT64, 0, &nparity) == 0) 577 vdev->v_nparity = nparity; 578 else 579 vdev->v_nparity = 0; 580 if (nvlist_find(nvlist, ZPOOL_CONFIG_PATH, 581 DATA_TYPE_STRING, 0, &path) == 0) { 582 if (strncmp(path, "/dev/", 5) == 0) 583 path += 5; 584 vdev->v_name = strdup(path); 585 } else { 586 if (!strcmp(type, "raidz")) { 587 if (vdev->v_nparity == 1) 588 vdev->v_name = "raidz1"; 589 else if (vdev->v_nparity == 2) 590 vdev->v_name = "raidz2"; 591 else if (vdev->v_nparity == 3) 592 vdev->v_name = "raidz3"; 593 else { 594 printf("ZFS: can only boot from disk, mirror, raidz1, raidz2 and raidz3 vdevs\n"); 595 return (EIO); 596 } 597 } else { 598 vdev->v_name = strdup(type); 599 } 600 } 601 } else { 602 is_new = 0; 603 } 604 605 if (is_new || is_newer) { 606 /* 607 * This is either new vdev or we've already seen this vdev, 608 * but from an older vdev label, so let's refresh its state 609 * from the newer label. 610 */ 611 if (is_offline) 612 vdev->v_state = VDEV_STATE_OFFLINE; 613 else if (is_removed) 614 vdev->v_state = VDEV_STATE_REMOVED; 615 else if (is_faulted) 616 vdev->v_state = VDEV_STATE_FAULTED; 617 else if (is_degraded) 618 vdev->v_state = VDEV_STATE_DEGRADED; 619 else if (isnt_present) 620 vdev->v_state = VDEV_STATE_CANT_OPEN; 621 } 622 623 rc = nvlist_find(nvlist, ZPOOL_CONFIG_CHILDREN, 624 DATA_TYPE_NVLIST_ARRAY, &nkids, &kids); 625 /* 626 * Its ok if we don't have any kids. 627 */ 628 if (rc == 0) { 629 vdev->v_nchildren = nkids; 630 for (i = 0; i < nkids; i++) { 631 rc = vdev_init_from_nvlist(kids, vdev, &kid, is_newer); 632 if (rc) 633 return (rc); 634 if (is_new) 635 STAILQ_INSERT_TAIL(&vdev->v_children, kid, 636 v_childlink); 637 kids = nvlist_next(kids); 638 } 639 } else { 640 vdev->v_nchildren = 0; 641 } 642 643 if (vdevp) 644 *vdevp = vdev; 645 return (0); 646} 647 648static void 649vdev_set_state(vdev_t *vdev) 650{ 651 vdev_t *kid; 652 int good_kids; 653 int bad_kids; 654 655 /* 656 * A mirror or raidz is healthy if all its kids are healthy. A 657 * mirror is degraded if any of its kids is healthy; a raidz 658 * is degraded if at most nparity kids are offline. 659 */ 660 if (STAILQ_FIRST(&vdev->v_children)) { 661 good_kids = 0; 662 bad_kids = 0; 663 STAILQ_FOREACH(kid, &vdev->v_children, v_childlink) { 664 if (kid->v_state == VDEV_STATE_HEALTHY) 665 good_kids++; 666 else 667 bad_kids++; 668 } 669 if (bad_kids == 0) { 670 vdev->v_state = VDEV_STATE_HEALTHY; 671 } else { 672 if (vdev->v_read == vdev_mirror_read) { 673 if (good_kids) { 674 vdev->v_state = VDEV_STATE_DEGRADED; 675 } else { 676 vdev->v_state = VDEV_STATE_OFFLINE; 677 } 678 } else if (vdev->v_read == vdev_raidz_read) { 679 if (bad_kids > vdev->v_nparity) { 680 vdev->v_state = VDEV_STATE_OFFLINE; 681 } else { 682 vdev->v_state = VDEV_STATE_DEGRADED; 683 } 684 } 685 } 686 } 687} 688 689static spa_t * 690spa_find_by_guid(uint64_t guid) 691{ 692 spa_t *spa; 693 694 STAILQ_FOREACH(spa, &zfs_pools, spa_link) 695 if (spa->spa_guid == guid) 696 return (spa); 697 698 return (0); 699} 700 701static spa_t * 702spa_find_by_name(const char *name) 703{ 704 spa_t *spa; 705 706 STAILQ_FOREACH(spa, &zfs_pools, spa_link) 707 if (!strcmp(spa->spa_name, name)) 708 return (spa); 709 710 return (0); 711} 712 713#ifdef BOOT2 714static spa_t * 715spa_get_primary(void) 716{ 717 718 return (STAILQ_FIRST(&zfs_pools)); 719} 720 721static vdev_t * 722spa_get_primary_vdev(const spa_t *spa) 723{ 724 vdev_t *vdev; 725 vdev_t *kid; 726 727 if (spa == NULL) 728 spa = spa_get_primary(); 729 if (spa == NULL) 730 return (NULL); 731 vdev = STAILQ_FIRST(&spa->spa_vdevs); 732 if (vdev == NULL) 733 return (NULL); 734 for (kid = STAILQ_FIRST(&vdev->v_children); kid != NULL; 735 kid = STAILQ_FIRST(&vdev->v_children)) 736 vdev = kid; 737 return (vdev); 738} 739#endif 740 741static spa_t * 742spa_create(uint64_t guid) 743{ 744 spa_t *spa; 745 746 spa = malloc(sizeof(spa_t)); 747 memset(spa, 0, sizeof(spa_t)); 748 STAILQ_INIT(&spa->spa_vdevs); 749 spa->spa_guid = guid; 750 STAILQ_INSERT_TAIL(&zfs_pools, spa, spa_link); 751 752 return (spa); 753} 754 755static const char * 756state_name(vdev_state_t state) 757{ 758 static const char* names[] = { 759 "UNKNOWN", 760 "CLOSED", 761 "OFFLINE", 762 "REMOVED", 763 "CANT_OPEN", 764 "FAULTED", 765 "DEGRADED", 766 "ONLINE" 767 }; 768 return names[state]; 769} 770 771#ifdef BOOT2 772 773#define pager_printf printf 774 775#else 776 777static void 778pager_printf(const char *fmt, ...) 779{ 780 char line[80]; 781 va_list args; 782 783 va_start(args, fmt); 784 vsprintf(line, fmt, args); 785 va_end(args); 786 pager_output(line); 787} 788 789#endif 790 791#define STATUS_FORMAT " %s %s\n" 792 793static void 794print_state(int indent, const char *name, vdev_state_t state) 795{ 796 int i; 797 char buf[512]; 798 799 buf[0] = 0; 800 for (i = 0; i < indent; i++) 801 strcat(buf, " "); 802 strcat(buf, name); 803 pager_printf(STATUS_FORMAT, buf, state_name(state)); 804 805} 806 807static void 808vdev_status(vdev_t *vdev, int indent) 809{ 810 vdev_t *kid; 811 print_state(indent, vdev->v_name, vdev->v_state); 812 813 STAILQ_FOREACH(kid, &vdev->v_children, v_childlink) { 814 vdev_status(kid, indent + 1); 815 } 816} 817 818static void 819spa_status(spa_t *spa) 820{ 821 static char bootfs[ZFS_MAXNAMELEN]; 822 uint64_t rootid; 823 vdev_t *vdev; 824 int good_kids, bad_kids, degraded_kids; 825 vdev_state_t state; 826 827 pager_printf(" pool: %s\n", spa->spa_name); 828 if (zfs_get_root(spa, &rootid) == 0 && 829 zfs_rlookup(spa, rootid, bootfs) == 0) { 830 if (bootfs[0] == '\0') 831 pager_printf("bootfs: %s\n", spa->spa_name); 832 else 833 pager_printf("bootfs: %s/%s\n", spa->spa_name, bootfs); 834 } 835 pager_printf("config:\n\n"); 836 pager_printf(STATUS_FORMAT, "NAME", "STATE"); 837 838 good_kids = 0; 839 degraded_kids = 0; 840 bad_kids = 0; 841 STAILQ_FOREACH(vdev, &spa->spa_vdevs, v_childlink) { 842 if (vdev->v_state == VDEV_STATE_HEALTHY) 843 good_kids++; 844 else if (vdev->v_state == VDEV_STATE_DEGRADED) 845 degraded_kids++; 846 else 847 bad_kids++; 848 } 849 850 state = VDEV_STATE_CLOSED; 851 if (good_kids > 0 && (degraded_kids + bad_kids) == 0) 852 state = VDEV_STATE_HEALTHY; 853 else if ((good_kids + degraded_kids) > 0) 854 state = VDEV_STATE_DEGRADED; 855 856 print_state(0, spa->spa_name, state); 857 STAILQ_FOREACH(vdev, &spa->spa_vdevs, v_childlink) { 858 vdev_status(vdev, 1); 859 } 860} 861 862static void 863spa_all_status(void) 864{ 865 spa_t *spa; 866 int first = 1; 867 868 STAILQ_FOREACH(spa, &zfs_pools, spa_link) { 869 if (!first) 870 pager_printf("\n"); 871 first = 0; 872 spa_status(spa); 873 } 874} 875 876static int 877vdev_probe(vdev_phys_read_t *read, void *read_priv, spa_t **spap) 878{ 879 vdev_t vtmp; 880 vdev_phys_t *vdev_label = (vdev_phys_t *) zap_scratch; 881 spa_t *spa; 882 vdev_t *vdev, *top_vdev, *pool_vdev; 883 off_t off; 884 blkptr_t bp; 885 const unsigned char *nvlist; 886 uint64_t val; 887 uint64_t guid; 888 uint64_t pool_txg, pool_guid; 889 uint64_t is_log; 890 const char *pool_name; 891 const unsigned char *vdevs; 892 const unsigned char *features; 893 int i, rc, is_newer; 894 char *upbuf; 895 const struct uberblock *up; 896 897 /* 898 * Load the vdev label and figure out which 899 * uberblock is most current. 900 */ 901 memset(&vtmp, 0, sizeof(vtmp)); 902 vtmp.v_phys_read = read; 903 vtmp.v_read_priv = read_priv; 904 off = offsetof(vdev_label_t, vl_vdev_phys); 905 BP_ZERO(&bp); 906 BP_SET_LSIZE(&bp, sizeof(vdev_phys_t)); 907 BP_SET_PSIZE(&bp, sizeof(vdev_phys_t)); 908 BP_SET_CHECKSUM(&bp, ZIO_CHECKSUM_LABEL); 909 BP_SET_COMPRESS(&bp, ZIO_COMPRESS_OFF); 910 DVA_SET_OFFSET(BP_IDENTITY(&bp), off); 911 ZIO_SET_CHECKSUM(&bp.blk_cksum, off, 0, 0, 0); 912 if (vdev_read_phys(&vtmp, &bp, vdev_label, off, 0)) 913 return (EIO); 914 915 if (vdev_label->vp_nvlist[0] != NV_ENCODE_XDR) { 916 return (EIO); 917 } 918 919 nvlist = (const unsigned char *) vdev_label->vp_nvlist + 4; 920 921 if (nvlist_find(nvlist, 922 ZPOOL_CONFIG_VERSION, 923 DATA_TYPE_UINT64, 0, &val)) { 924 return (EIO); 925 } 926 927 if (!SPA_VERSION_IS_SUPPORTED(val)) { 928 printf("ZFS: unsupported ZFS version %u (should be %u)\n", 929 (unsigned) val, (unsigned) SPA_VERSION); 930 return (EIO); 931 } 932 933 /* Check ZFS features for read */ 934 if (nvlist_find(nvlist, 935 ZPOOL_CONFIG_FEATURES_FOR_READ, 936 DATA_TYPE_NVLIST, 0, &features) == 0 937 && nvlist_check_features_for_read(features) != 0) 938 return (EIO); 939 940 if (nvlist_find(nvlist, 941 ZPOOL_CONFIG_POOL_STATE, 942 DATA_TYPE_UINT64, 0, &val)) { 943 return (EIO); 944 } 945 946 if (val == POOL_STATE_DESTROYED) { 947 /* We don't boot only from destroyed pools. */ 948 return (EIO); 949 } 950 951 if (nvlist_find(nvlist, 952 ZPOOL_CONFIG_POOL_TXG, 953 DATA_TYPE_UINT64, 0, &pool_txg) 954 || nvlist_find(nvlist, 955 ZPOOL_CONFIG_POOL_GUID, 956 DATA_TYPE_UINT64, 0, &pool_guid) 957 || nvlist_find(nvlist, 958 ZPOOL_CONFIG_POOL_NAME, 959 DATA_TYPE_STRING, 0, &pool_name)) { 960 /* 961 * Cache and spare devices end up here - just ignore 962 * them. 963 */ 964 /*printf("ZFS: can't find pool details\n");*/ 965 return (EIO); 966 } 967 968 is_log = 0; 969 (void) nvlist_find(nvlist, ZPOOL_CONFIG_IS_LOG, DATA_TYPE_UINT64, 0, 970 &is_log); 971 if (is_log) 972 return (EIO); 973 974 /* 975 * Create the pool if this is the first time we've seen it. 976 */ 977 spa = spa_find_by_guid(pool_guid); 978 if (!spa) { 979 spa = spa_create(pool_guid); 980 spa->spa_name = strdup(pool_name); 981 } 982 if (pool_txg > spa->spa_txg) { 983 spa->spa_txg = pool_txg; 984 is_newer = 1; 985 } else 986 is_newer = 0; 987 988 /* 989 * Get the vdev tree and create our in-core copy of it. 990 * If we already have a vdev with this guid, this must 991 * be some kind of alias (overlapping slices, dangerously dedicated 992 * disks etc). 993 */ 994 if (nvlist_find(nvlist, 995 ZPOOL_CONFIG_GUID, 996 DATA_TYPE_UINT64, 0, &guid)) { 997 return (EIO); 998 } 999 vdev = vdev_find(guid); 1000 if (vdev && vdev->v_phys_read) /* Has this vdev already been inited? */ 1001 return (EIO); 1002 1003 if (nvlist_find(nvlist, 1004 ZPOOL_CONFIG_VDEV_TREE, 1005 DATA_TYPE_NVLIST, 0, &vdevs)) { 1006 return (EIO); 1007 } 1008 1009 rc = vdev_init_from_nvlist(vdevs, NULL, &top_vdev, is_newer); 1010 if (rc) 1011 return (rc); 1012 1013 /* 1014 * Add the toplevel vdev to the pool if its not already there. 1015 */ 1016 STAILQ_FOREACH(pool_vdev, &spa->spa_vdevs, v_childlink) 1017 if (top_vdev == pool_vdev) 1018 break; 1019 if (!pool_vdev && top_vdev) 1020 STAILQ_INSERT_TAIL(&spa->spa_vdevs, top_vdev, v_childlink); 1021 1022 /* 1023 * We should already have created an incomplete vdev for this 1024 * vdev. Find it and initialise it with our read proc. 1025 */ 1026 vdev = vdev_find(guid); 1027 if (vdev) { 1028 vdev->v_phys_read = read; 1029 vdev->v_read_priv = read_priv; 1030 vdev->v_state = VDEV_STATE_HEALTHY; 1031 } else { 1032 printf("ZFS: inconsistent nvlist contents\n"); 1033 return (EIO); 1034 } 1035 1036 /* 1037 * Re-evaluate top-level vdev state. 1038 */ 1039 vdev_set_state(top_vdev); 1040 1041 /* 1042 * Ok, we are happy with the pool so far. Lets find 1043 * the best uberblock and then we can actually access 1044 * the contents of the pool. 1045 */ 1046 upbuf = zfs_alloc(VDEV_UBERBLOCK_SIZE(vdev)); 1047 up = (const struct uberblock *)upbuf; 1048 for (i = 0; 1049 i < VDEV_UBERBLOCK_COUNT(vdev); 1050 i++) { 1051 off = VDEV_UBERBLOCK_OFFSET(vdev, i); 1052 BP_ZERO(&bp); 1053 DVA_SET_OFFSET(&bp.blk_dva[0], off); 1054 BP_SET_LSIZE(&bp, VDEV_UBERBLOCK_SIZE(vdev)); 1055 BP_SET_PSIZE(&bp, VDEV_UBERBLOCK_SIZE(vdev)); 1056 BP_SET_CHECKSUM(&bp, ZIO_CHECKSUM_LABEL); 1057 BP_SET_COMPRESS(&bp, ZIO_COMPRESS_OFF); 1058 ZIO_SET_CHECKSUM(&bp.blk_cksum, off, 0, 0, 0); 1059 1060 if (vdev_read_phys(vdev, &bp, upbuf, off, 0)) 1061 continue; 1062 1063 if (up->ub_magic != UBERBLOCK_MAGIC) 1064 continue; 1065 if (up->ub_txg < spa->spa_txg) 1066 continue; 1067 if (up->ub_txg > spa->spa_uberblock.ub_txg) { 1068 spa->spa_uberblock = *up; 1069 } else if (up->ub_txg == spa->spa_uberblock.ub_txg) { 1070 if (up->ub_timestamp > spa->spa_uberblock.ub_timestamp) 1071 spa->spa_uberblock = *up; 1072 } 1073 } 1074 zfs_free(upbuf, VDEV_UBERBLOCK_SIZE(vdev)); 1075 1076 if (spap) 1077 *spap = spa; 1078 return (0); 1079} 1080 1081static int 1082ilog2(int n) 1083{ 1084 int v; 1085 1086 for (v = 0; v < 32; v++) 1087 if (n == (1 << v)) 1088 return v; 1089 return -1; 1090} 1091 1092static int 1093zio_read_gang(const spa_t *spa, const blkptr_t *bp, void *buf) 1094{ 1095 blkptr_t gbh_bp; 1096 zio_gbh_phys_t zio_gb; 1097 char *pbuf; 1098 int i; 1099 1100 /* Artificial BP for gang block header. */ 1101 gbh_bp = *bp; 1102 BP_SET_PSIZE(&gbh_bp, SPA_GANGBLOCKSIZE); 1103 BP_SET_LSIZE(&gbh_bp, SPA_GANGBLOCKSIZE); 1104 BP_SET_CHECKSUM(&gbh_bp, ZIO_CHECKSUM_GANG_HEADER); 1105 BP_SET_COMPRESS(&gbh_bp, ZIO_COMPRESS_OFF); 1106 for (i = 0; i < SPA_DVAS_PER_BP; i++) 1107 DVA_SET_GANG(&gbh_bp.blk_dva[i], 0); 1108 1109 /* Read gang header block using the artificial BP. */ 1110 if (zio_read(spa, &gbh_bp, &zio_gb)) 1111 return (EIO); 1112 1113 pbuf = buf; 1114 for (i = 0; i < SPA_GBH_NBLKPTRS; i++) { 1115 blkptr_t *gbp = &zio_gb.zg_blkptr[i]; 1116 1117 if (BP_IS_HOLE(gbp)) 1118 continue; 1119 if (zio_read(spa, gbp, pbuf)) 1120 return (EIO); 1121 pbuf += BP_GET_PSIZE(gbp); 1122 } 1123 1124 if (zio_checksum_verify(bp, buf)) 1125 return (EIO); 1126 return (0); 1127} 1128 1129static int 1130zio_read(const spa_t *spa, const blkptr_t *bp, void *buf) 1131{ 1132 int cpfunc = BP_GET_COMPRESS(bp); 1133 uint64_t align, size; 1134 void *pbuf; 1135 int i, error; 1136 1137 /* 1138 * Process data embedded in block pointer 1139 */ 1140 if (BP_IS_EMBEDDED(bp)) { 1141 ASSERT(BPE_GET_ETYPE(bp) == BP_EMBEDDED_TYPE_DATA); 1142 1143 size = BPE_GET_PSIZE(bp); 1144 ASSERT(size <= BPE_PAYLOAD_SIZE); 1145 1146 if (cpfunc != ZIO_COMPRESS_OFF) 1147 pbuf = zfs_alloc(size); 1148 else 1149 pbuf = buf; 1150 1151 decode_embedded_bp_compressed(bp, pbuf); 1152 error = 0; 1153 1154 if (cpfunc != ZIO_COMPRESS_OFF) { 1155 error = zio_decompress_data(cpfunc, pbuf, 1156 size, buf, BP_GET_LSIZE(bp)); 1157 zfs_free(pbuf, size); 1158 } 1159 if (error != 0) 1160 printf("ZFS: i/o error - unable to decompress block pointer data, error %d\n", 1161 error); 1162 return (error); 1163 } 1164 1165 error = EIO; 1166 1167 for (i = 0; i < SPA_DVAS_PER_BP; i++) { 1168 const dva_t *dva = &bp->blk_dva[i]; 1169 vdev_t *vdev; 1170 int vdevid; 1171 off_t offset; 1172 1173 if (!dva->dva_word[0] && !dva->dva_word[1]) 1174 continue; 1175 1176 vdevid = DVA_GET_VDEV(dva); 1177 offset = DVA_GET_OFFSET(dva); 1178 STAILQ_FOREACH(vdev, &spa->spa_vdevs, v_childlink) { 1179 if (vdev->v_id == vdevid) 1180 break; 1181 } 1182 if (!vdev || !vdev->v_read) 1183 continue; 1184 1185 size = BP_GET_PSIZE(bp); 1186 if (vdev->v_read == vdev_raidz_read) { 1187 align = 1ULL << vdev->v_top->v_ashift; 1188 if (P2PHASE(size, align) != 0) 1189 size = P2ROUNDUP(size, align); 1190 } 1191 if (size != BP_GET_PSIZE(bp) || cpfunc != ZIO_COMPRESS_OFF) 1192 pbuf = zfs_alloc(size); 1193 else 1194 pbuf = buf; 1195 1196 if (DVA_GET_GANG(dva)) 1197 error = zio_read_gang(spa, bp, pbuf); 1198 else 1199 error = vdev->v_read(vdev, bp, pbuf, offset, size); 1200 if (error == 0) { 1201 if (cpfunc != ZIO_COMPRESS_OFF) 1202 error = zio_decompress_data(cpfunc, pbuf, 1203 BP_GET_PSIZE(bp), buf, BP_GET_LSIZE(bp)); 1204 else if (size != BP_GET_PSIZE(bp)) 1205 bcopy(pbuf, buf, BP_GET_PSIZE(bp)); 1206 } 1207 if (buf != pbuf) 1208 zfs_free(pbuf, size); 1209 if (error == 0) 1210 break; 1211 } 1212 if (error != 0) 1213 printf("ZFS: i/o error - all block copies unavailable\n"); 1214 return (error); 1215} 1216 1217static int 1218dnode_read(const spa_t *spa, const dnode_phys_t *dnode, off_t offset, void *buf, size_t buflen) 1219{ 1220 int ibshift = dnode->dn_indblkshift - SPA_BLKPTRSHIFT; 1221 int bsize = dnode->dn_datablkszsec << SPA_MINBLOCKSHIFT; 1222 int nlevels = dnode->dn_nlevels; 1223 int i, rc; 1224 1225 /* 1226 * Note: bsize may not be a power of two here so we need to do an 1227 * actual divide rather than a bitshift. 1228 */ 1229 while (buflen > 0) { 1230 uint64_t bn = offset / bsize; 1231 int boff = offset % bsize; 1232 int ibn; 1233 const blkptr_t *indbp; 1234 blkptr_t bp; 1235 1236 if (bn > dnode->dn_maxblkid) 1237 return (EIO); 1238 1239 if (dnode == dnode_cache_obj && bn == dnode_cache_bn) 1240 goto cached; 1241 1242 indbp = dnode->dn_blkptr; 1243 for (i = 0; i < nlevels; i++) { 1244 /* 1245 * Copy the bp from the indirect array so that 1246 * we can re-use the scratch buffer for multi-level 1247 * objects. 1248 */ 1249 ibn = bn >> ((nlevels - i - 1) * ibshift); 1250 ibn &= ((1 << ibshift) - 1); 1251 bp = indbp[ibn]; 1252 rc = zio_read(spa, &bp, dnode_cache_buf); 1253 if (rc) 1254 return (rc); 1255 indbp = (const blkptr_t *) dnode_cache_buf; 1256 } 1257 dnode_cache_obj = dnode; 1258 dnode_cache_bn = bn; 1259 cached: 1260 1261 /* 1262 * The buffer contains our data block. Copy what we 1263 * need from it and loop. 1264 */ 1265 i = bsize - boff; 1266 if (i > buflen) i = buflen; 1267 memcpy(buf, &dnode_cache_buf[boff], i); 1268 buf = ((char*) buf) + i; 1269 offset += i; 1270 buflen -= i; 1271 } 1272 1273 return (0); 1274} 1275 1276/* 1277 * Lookup a value in a microzap directory. Assumes that the zap 1278 * scratch buffer contains the directory contents. 1279 */ 1280static int 1281mzap_lookup(const dnode_phys_t *dnode, const char *name, uint64_t *value) 1282{ 1283 const mzap_phys_t *mz; 1284 const mzap_ent_phys_t *mze; 1285 size_t size; 1286 int chunks, i; 1287 1288 /* 1289 * Microzap objects use exactly one block. Read the whole 1290 * thing. 1291 */ 1292 size = dnode->dn_datablkszsec * 512; 1293 1294 mz = (const mzap_phys_t *) zap_scratch; 1295 chunks = size / MZAP_ENT_LEN - 1; 1296 1297 for (i = 0; i < chunks; i++) { 1298 mze = &mz->mz_chunk[i]; 1299 if (!strcmp(mze->mze_name, name)) { 1300 *value = mze->mze_value; 1301 return (0); 1302 } 1303 } 1304 1305 return (ENOENT); 1306} 1307 1308/* 1309 * Compare a name with a zap leaf entry. Return non-zero if the name 1310 * matches. 1311 */ 1312static int 1313fzap_name_equal(const zap_leaf_t *zl, const zap_leaf_chunk_t *zc, const char *name) 1314{ 1315 size_t namelen; 1316 const zap_leaf_chunk_t *nc; 1317 const char *p; 1318 1319 namelen = zc->l_entry.le_name_numints; 1320 1321 nc = &ZAP_LEAF_CHUNK(zl, zc->l_entry.le_name_chunk); 1322 p = name; 1323 while (namelen > 0) { 1324 size_t len; 1325 len = namelen; 1326 if (len > ZAP_LEAF_ARRAY_BYTES) 1327 len = ZAP_LEAF_ARRAY_BYTES; 1328 if (memcmp(p, nc->l_array.la_array, len)) 1329 return (0); 1330 p += len; 1331 namelen -= len; 1332 nc = &ZAP_LEAF_CHUNK(zl, nc->l_array.la_next); 1333 } 1334 1335 return 1; 1336} 1337 1338/* 1339 * Extract a uint64_t value from a zap leaf entry. 1340 */ 1341static uint64_t 1342fzap_leaf_value(const zap_leaf_t *zl, const zap_leaf_chunk_t *zc) 1343{ 1344 const zap_leaf_chunk_t *vc; 1345 int i; 1346 uint64_t value; 1347 const uint8_t *p; 1348 1349 vc = &ZAP_LEAF_CHUNK(zl, zc->l_entry.le_value_chunk); 1350 for (i = 0, value = 0, p = vc->l_array.la_array; i < 8; i++) { 1351 value = (value << 8) | p[i]; 1352 } 1353 1354 return value; 1355} 1356 1357/* 1358 * Lookup a value in a fatzap directory. Assumes that the zap scratch 1359 * buffer contains the directory header. 1360 */ 1361static int 1362fzap_lookup(const spa_t *spa, const dnode_phys_t *dnode, const char *name, uint64_t *value) 1363{ 1364 int bsize = dnode->dn_datablkszsec << SPA_MINBLOCKSHIFT; 1365 zap_phys_t zh = *(zap_phys_t *) zap_scratch; 1366 fat_zap_t z; 1367 uint64_t *ptrtbl; 1368 uint64_t hash; 1369 int rc; 1370 1371 if (zh.zap_magic != ZAP_MAGIC) 1372 return (EIO); 1373 1374 z.zap_block_shift = ilog2(bsize); 1375 z.zap_phys = (zap_phys_t *) zap_scratch; 1376 1377 /* 1378 * Figure out where the pointer table is and read it in if necessary. 1379 */ 1380 if (zh.zap_ptrtbl.zt_blk) { 1381 rc = dnode_read(spa, dnode, zh.zap_ptrtbl.zt_blk * bsize, 1382 zap_scratch, bsize); 1383 if (rc) 1384 return (rc); 1385 ptrtbl = (uint64_t *) zap_scratch; 1386 } else { 1387 ptrtbl = &ZAP_EMBEDDED_PTRTBL_ENT(&z, 0); 1388 } 1389 1390 hash = zap_hash(zh.zap_salt, name); 1391 1392 zap_leaf_t zl; 1393 zl.l_bs = z.zap_block_shift; 1394 1395 off_t off = ptrtbl[hash >> (64 - zh.zap_ptrtbl.zt_shift)] << zl.l_bs; 1396 zap_leaf_chunk_t *zc; 1397 1398 rc = dnode_read(spa, dnode, off, zap_scratch, bsize); 1399 if (rc) 1400 return (rc); 1401 1402 zl.l_phys = (zap_leaf_phys_t *) zap_scratch; 1403 1404 /* 1405 * Make sure this chunk matches our hash. 1406 */ 1407 if (zl.l_phys->l_hdr.lh_prefix_len > 0 1408 && zl.l_phys->l_hdr.lh_prefix 1409 != hash >> (64 - zl.l_phys->l_hdr.lh_prefix_len)) 1410 return (ENOENT); 1411 1412 /* 1413 * Hash within the chunk to find our entry. 1414 */ 1415 int shift = (64 - ZAP_LEAF_HASH_SHIFT(&zl) - zl.l_phys->l_hdr.lh_prefix_len); 1416 int h = (hash >> shift) & ((1 << ZAP_LEAF_HASH_SHIFT(&zl)) - 1); 1417 h = zl.l_phys->l_hash[h]; 1418 if (h == 0xffff) 1419 return (ENOENT); 1420 zc = &ZAP_LEAF_CHUNK(&zl, h); 1421 while (zc->l_entry.le_hash != hash) { 1422 if (zc->l_entry.le_next == 0xffff) { 1423 zc = 0; 1424 break; 1425 } 1426 zc = &ZAP_LEAF_CHUNK(&zl, zc->l_entry.le_next); 1427 } 1428 if (fzap_name_equal(&zl, zc, name)) { 1429 if (zc->l_entry.le_value_intlen * zc->l_entry.le_value_numints > 8) 1430 return (E2BIG); 1431 *value = fzap_leaf_value(&zl, zc); 1432 return (0); 1433 } 1434 1435 return (ENOENT); 1436} 1437 1438/* 1439 * Lookup a name in a zap object and return its value as a uint64_t. 1440 */ 1441static int 1442zap_lookup(const spa_t *spa, const dnode_phys_t *dnode, const char *name, uint64_t *value) 1443{ 1444 int rc; 1445 uint64_t zap_type; 1446 size_t size = dnode->dn_datablkszsec << SPA_MINBLOCKSHIFT; 1447 1448 rc = dnode_read(spa, dnode, 0, zap_scratch, size); 1449 if (rc) 1450 return (rc); 1451 1452 zap_type = *(uint64_t *) zap_scratch; 1453 if (zap_type == ZBT_MICRO) 1454 return mzap_lookup(dnode, name, value); 1455 else if (zap_type == ZBT_HEADER) 1456 return fzap_lookup(spa, dnode, name, value); 1457 printf("ZFS: invalid zap_type=%d\n", (int)zap_type); 1458 return (EIO); 1459} 1460 1461/* 1462 * List a microzap directory. Assumes that the zap scratch buffer contains 1463 * the directory contents. 1464 */ 1465static int 1466mzap_list(const dnode_phys_t *dnode) 1467{ 1468 const mzap_phys_t *mz; 1469 const mzap_ent_phys_t *mze; 1470 size_t size; 1471 int chunks, i; 1472 1473 /* 1474 * Microzap objects use exactly one block. Read the whole 1475 * thing. 1476 */ 1477 size = dnode->dn_datablkszsec * 512; 1478 mz = (const mzap_phys_t *) zap_scratch; 1479 chunks = size / MZAP_ENT_LEN - 1; 1480 1481 for (i = 0; i < chunks; i++) { 1482 mze = &mz->mz_chunk[i]; 1483 if (mze->mze_name[0]) 1484 //printf("%-32s 0x%jx\n", mze->mze_name, (uintmax_t)mze->mze_value); 1485 printf("%s\n", mze->mze_name); 1486 } 1487 1488 return (0); 1489} 1490 1491/* 1492 * List a fatzap directory. Assumes that the zap scratch buffer contains 1493 * the directory header. 1494 */ 1495static int 1496fzap_list(const spa_t *spa, const dnode_phys_t *dnode) 1497{ 1498 int bsize = dnode->dn_datablkszsec << SPA_MINBLOCKSHIFT; 1499 zap_phys_t zh = *(zap_phys_t *) zap_scratch; 1500 fat_zap_t z; 1501 int i, j; 1502 1503 if (zh.zap_magic != ZAP_MAGIC) 1504 return (EIO); 1505 1506 z.zap_block_shift = ilog2(bsize); 1507 z.zap_phys = (zap_phys_t *) zap_scratch; 1508 1509 /* 1510 * This assumes that the leaf blocks start at block 1. The 1511 * documentation isn't exactly clear on this. 1512 */ 1513 zap_leaf_t zl; 1514 zl.l_bs = z.zap_block_shift; 1515 for (i = 0; i < zh.zap_num_leafs; i++) { 1516 off_t off = (i + 1) << zl.l_bs; 1517 char name[256], *p; 1518 uint64_t value; 1519 1520 if (dnode_read(spa, dnode, off, zap_scratch, bsize)) 1521 return (EIO); 1522 1523 zl.l_phys = (zap_leaf_phys_t *) zap_scratch; 1524 1525 for (j = 0; j < ZAP_LEAF_NUMCHUNKS(&zl); j++) { 1526 zap_leaf_chunk_t *zc, *nc; 1527 int namelen; 1528 1529 zc = &ZAP_LEAF_CHUNK(&zl, j); 1530 if (zc->l_entry.le_type != ZAP_CHUNK_ENTRY) 1531 continue; 1532 namelen = zc->l_entry.le_name_numints; 1533 if (namelen > sizeof(name)) 1534 namelen = sizeof(name); 1535 1536 /* 1537 * Paste the name back together. 1538 */ 1539 nc = &ZAP_LEAF_CHUNK(&zl, zc->l_entry.le_name_chunk); 1540 p = name; 1541 while (namelen > 0) { 1542 int len; 1543 len = namelen; 1544 if (len > ZAP_LEAF_ARRAY_BYTES) 1545 len = ZAP_LEAF_ARRAY_BYTES; 1546 memcpy(p, nc->l_array.la_array, len); 1547 p += len; 1548 namelen -= len; 1549 nc = &ZAP_LEAF_CHUNK(&zl, nc->l_array.la_next); 1550 } 1551 1552 /* 1553 * Assume the first eight bytes of the value are 1554 * a uint64_t. 1555 */ 1556 value = fzap_leaf_value(&zl, zc); 1557 1558 //printf("%s 0x%jx\n", name, (uintmax_t)value); 1559 printf("%s\n", name); 1560 } 1561 } 1562 1563 return (0); 1564} 1565 1566/* 1567 * List a zap directory. 1568 */ 1569static int 1570zap_list(const spa_t *spa, const dnode_phys_t *dnode) 1571{ 1572 uint64_t zap_type; 1573 size_t size = dnode->dn_datablkszsec * 512; 1574 1575 if (dnode_read(spa, dnode, 0, zap_scratch, size)) 1576 return (EIO); 1577 1578 zap_type = *(uint64_t *) zap_scratch; 1579 if (zap_type == ZBT_MICRO) 1580 return mzap_list(dnode); 1581 else 1582 return fzap_list(spa, dnode); 1583} 1584 1585static int 1586objset_get_dnode(const spa_t *spa, const objset_phys_t *os, uint64_t objnum, dnode_phys_t *dnode) 1587{ 1588 off_t offset; 1589 1590 offset = objnum * sizeof(dnode_phys_t); 1591 return dnode_read(spa, &os->os_meta_dnode, offset, 1592 dnode, sizeof(dnode_phys_t)); 1593} 1594 1595static int 1596mzap_rlookup(const spa_t *spa, const dnode_phys_t *dnode, char *name, uint64_t value) 1597{ 1598 const mzap_phys_t *mz; 1599 const mzap_ent_phys_t *mze; 1600 size_t size; 1601 int chunks, i; 1602 1603 /* 1604 * Microzap objects use exactly one block. Read the whole 1605 * thing. 1606 */ 1607 size = dnode->dn_datablkszsec * 512; 1608 1609 mz = (const mzap_phys_t *) zap_scratch; 1610 chunks = size / MZAP_ENT_LEN - 1; 1611 1612 for (i = 0; i < chunks; i++) { 1613 mze = &mz->mz_chunk[i]; 1614 if (value == mze->mze_value) { 1615 strcpy(name, mze->mze_name); 1616 return (0); 1617 } 1618 } 1619 1620 return (ENOENT); 1621} 1622 1623static void 1624fzap_name_copy(const zap_leaf_t *zl, const zap_leaf_chunk_t *zc, char *name) 1625{ 1626 size_t namelen; 1627 const zap_leaf_chunk_t *nc; 1628 char *p; 1629 1630 namelen = zc->l_entry.le_name_numints; 1631 1632 nc = &ZAP_LEAF_CHUNK(zl, zc->l_entry.le_name_chunk); 1633 p = name; 1634 while (namelen > 0) { 1635 size_t len; 1636 len = namelen; 1637 if (len > ZAP_LEAF_ARRAY_BYTES) 1638 len = ZAP_LEAF_ARRAY_BYTES; 1639 memcpy(p, nc->l_array.la_array, len); 1640 p += len; 1641 namelen -= len; 1642 nc = &ZAP_LEAF_CHUNK(zl, nc->l_array.la_next); 1643 } 1644 1645 *p = '\0'; 1646} 1647 1648static int 1649fzap_rlookup(const spa_t *spa, const dnode_phys_t *dnode, char *name, uint64_t value) 1650{ 1651 int bsize = dnode->dn_datablkszsec << SPA_MINBLOCKSHIFT; 1652 zap_phys_t zh = *(zap_phys_t *) zap_scratch; 1653 fat_zap_t z; 1654 int i, j; 1655 1656 if (zh.zap_magic != ZAP_MAGIC) 1657 return (EIO); 1658 1659 z.zap_block_shift = ilog2(bsize); 1660 z.zap_phys = (zap_phys_t *) zap_scratch; 1661 1662 /* 1663 * This assumes that the leaf blocks start at block 1. The 1664 * documentation isn't exactly clear on this. 1665 */ 1666 zap_leaf_t zl; 1667 zl.l_bs = z.zap_block_shift; 1668 for (i = 0; i < zh.zap_num_leafs; i++) { 1669 off_t off = (i + 1) << zl.l_bs; 1670 1671 if (dnode_read(spa, dnode, off, zap_scratch, bsize)) 1672 return (EIO); 1673 1674 zl.l_phys = (zap_leaf_phys_t *) zap_scratch; 1675 1676 for (j = 0; j < ZAP_LEAF_NUMCHUNKS(&zl); j++) { 1677 zap_leaf_chunk_t *zc; 1678 1679 zc = &ZAP_LEAF_CHUNK(&zl, j); 1680 if (zc->l_entry.le_type != ZAP_CHUNK_ENTRY) 1681 continue; 1682 if (zc->l_entry.le_value_intlen != 8 || 1683 zc->l_entry.le_value_numints != 1) 1684 continue; 1685 1686 if (fzap_leaf_value(&zl, zc) == value) { 1687 fzap_name_copy(&zl, zc, name); 1688 return (0); 1689 } 1690 } 1691 } 1692 1693 return (ENOENT); 1694} 1695 1696static int 1697zap_rlookup(const spa_t *spa, const dnode_phys_t *dnode, char *name, uint64_t value) 1698{ 1699 int rc; 1700 uint64_t zap_type; 1701 size_t size = dnode->dn_datablkszsec * 512; 1702 1703 rc = dnode_read(spa, dnode, 0, zap_scratch, size); 1704 if (rc) 1705 return (rc); 1706 1707 zap_type = *(uint64_t *) zap_scratch; 1708 if (zap_type == ZBT_MICRO) 1709 return mzap_rlookup(spa, dnode, name, value); 1710 else 1711 return fzap_rlookup(spa, dnode, name, value); 1712} 1713 1714static int 1715zfs_rlookup(const spa_t *spa, uint64_t objnum, char *result) 1716{ 1717 char name[256]; 1718 char component[256]; 1719 uint64_t dir_obj, parent_obj, child_dir_zapobj; 1720 dnode_phys_t child_dir_zap, dataset, dir, parent; 1721 dsl_dir_phys_t *dd; 1722 dsl_dataset_phys_t *ds; 1723 char *p; 1724 int len; 1725 1726 p = &name[sizeof(name) - 1]; 1727 *p = '\0'; 1728 1729 if (objset_get_dnode(spa, &spa->spa_mos, objnum, &dataset)) { 1730 printf("ZFS: can't find dataset %ju\n", (uintmax_t)objnum); 1731 return (EIO); 1732 } 1733 ds = (dsl_dataset_phys_t *)&dataset.dn_bonus; 1734 dir_obj = ds->ds_dir_obj; 1735 1736 for (;;) { 1737 if (objset_get_dnode(spa, &spa->spa_mos, dir_obj, &dir) != 0) 1738 return (EIO); 1739 dd = (dsl_dir_phys_t *)&dir.dn_bonus; 1740 1741 /* Actual loop condition. */ 1742 parent_obj = dd->dd_parent_obj; 1743 if (parent_obj == 0) 1744 break; 1745 1746 if (objset_get_dnode(spa, &spa->spa_mos, parent_obj, &parent) != 0) 1747 return (EIO); 1748 dd = (dsl_dir_phys_t *)&parent.dn_bonus; 1749 child_dir_zapobj = dd->dd_child_dir_zapobj; 1750 if (objset_get_dnode(spa, &spa->spa_mos, child_dir_zapobj, &child_dir_zap) != 0) 1751 return (EIO); 1752 if (zap_rlookup(spa, &child_dir_zap, component, dir_obj) != 0) 1753 return (EIO); 1754 1755 len = strlen(component); 1756 p -= len; 1757 memcpy(p, component, len); 1758 --p; 1759 *p = '/'; 1760 1761 /* Actual loop iteration. */ 1762 dir_obj = parent_obj; 1763 } 1764 1765 if (*p != '\0') 1766 ++p; 1767 strcpy(result, p); 1768 1769 return (0); 1770} 1771 1772static int 1773zfs_lookup_dataset(const spa_t *spa, const char *name, uint64_t *objnum) 1774{ 1775 char element[256]; 1776 uint64_t dir_obj, child_dir_zapobj; 1777 dnode_phys_t child_dir_zap, dir; 1778 dsl_dir_phys_t *dd; 1779 const char *p, *q; 1780 1781 if (objset_get_dnode(spa, &spa->spa_mos, DMU_POOL_DIRECTORY_OBJECT, &dir)) 1782 return (EIO); 1783 if (zap_lookup(spa, &dir, DMU_POOL_ROOT_DATASET, &dir_obj)) 1784 return (EIO); 1785 1786 p = name; 1787 for (;;) { 1788 if (objset_get_dnode(spa, &spa->spa_mos, dir_obj, &dir)) 1789 return (EIO); 1790 dd = (dsl_dir_phys_t *)&dir.dn_bonus; 1791 1792 while (*p == '/') 1793 p++; 1794 /* Actual loop condition #1. */ 1795 if (*p == '\0') 1796 break; 1797 1798 q = strchr(p, '/'); 1799 if (q) { 1800 memcpy(element, p, q - p); 1801 element[q - p] = '\0'; 1802 p = q + 1; 1803 } else { 1804 strcpy(element, p); 1805 p += strlen(p); 1806 } 1807 1808 child_dir_zapobj = dd->dd_child_dir_zapobj; 1809 if (objset_get_dnode(spa, &spa->spa_mos, child_dir_zapobj, &child_dir_zap) != 0) 1810 return (EIO); 1811 1812 /* Actual loop condition #2. */ 1813 if (zap_lookup(spa, &child_dir_zap, element, &dir_obj) != 0) 1814 return (ENOENT); 1815 } 1816 1817 *objnum = dd->dd_head_dataset_obj; 1818 return (0); 1819} 1820 1821#ifndef BOOT2 1822static int 1823zfs_list_dataset(const spa_t *spa, uint64_t objnum/*, int pos, char *entry*/) 1824{ 1825 uint64_t dir_obj, child_dir_zapobj; 1826 dnode_phys_t child_dir_zap, dir, dataset; 1827 dsl_dataset_phys_t *ds; 1828 dsl_dir_phys_t *dd; 1829 1830 if (objset_get_dnode(spa, &spa->spa_mos, objnum, &dataset)) { 1831 printf("ZFS: can't find dataset %ju\n", (uintmax_t)objnum); 1832 return (EIO); 1833 } 1834 ds = (dsl_dataset_phys_t *) &dataset.dn_bonus; 1835 dir_obj = ds->ds_dir_obj; 1836 1837 if (objset_get_dnode(spa, &spa->spa_mos, dir_obj, &dir)) { 1838 printf("ZFS: can't find dirobj %ju\n", (uintmax_t)dir_obj); 1839 return (EIO); 1840 } 1841 dd = (dsl_dir_phys_t *)&dir.dn_bonus; 1842 1843 child_dir_zapobj = dd->dd_child_dir_zapobj; 1844 if (objset_get_dnode(spa, &spa->spa_mos, child_dir_zapobj, &child_dir_zap) != 0) { 1845 printf("ZFS: can't find child zap %ju\n", (uintmax_t)dir_obj); 1846 return (EIO); 1847 } 1848 1849 return (zap_list(spa, &child_dir_zap) != 0); 1850} 1851#endif 1852 1853/* 1854 * Find the object set given the object number of its dataset object 1855 * and return its details in *objset 1856 */ 1857static int 1858zfs_mount_dataset(const spa_t *spa, uint64_t objnum, objset_phys_t *objset) 1859{ 1860 dnode_phys_t dataset; 1861 dsl_dataset_phys_t *ds; 1862 1863 if (objset_get_dnode(spa, &spa->spa_mos, objnum, &dataset)) { 1864 printf("ZFS: can't find dataset %ju\n", (uintmax_t)objnum); 1865 return (EIO); 1866 } 1867 1868 ds = (dsl_dataset_phys_t *) &dataset.dn_bonus; 1869 if (zio_read(spa, &ds->ds_bp, objset)) { 1870 printf("ZFS: can't read object set for dataset %ju\n", 1871 (uintmax_t)objnum); 1872 return (EIO); 1873 } 1874 1875 return (0); 1876} 1877 1878/* 1879 * Find the object set pointed to by the BOOTFS property or the root 1880 * dataset if there is none and return its details in *objset 1881 */ 1882static int 1883zfs_get_root(const spa_t *spa, uint64_t *objid) 1884{ 1885 dnode_phys_t dir, propdir; 1886 uint64_t props, bootfs, root; 1887 1888 *objid = 0; 1889 1890 /* 1891 * Start with the MOS directory object. 1892 */ 1893 if (objset_get_dnode(spa, &spa->spa_mos, DMU_POOL_DIRECTORY_OBJECT, &dir)) { 1894 printf("ZFS: can't read MOS object directory\n"); 1895 return (EIO); 1896 } 1897 1898 /* 1899 * Lookup the pool_props and see if we can find a bootfs. 1900 */ 1901 if (zap_lookup(spa, &dir, DMU_POOL_PROPS, &props) == 0 1902 && objset_get_dnode(spa, &spa->spa_mos, props, &propdir) == 0 1903 && zap_lookup(spa, &propdir, "bootfs", &bootfs) == 0 1904 && bootfs != 0) 1905 { 1906 *objid = bootfs; 1907 return (0); 1908 } 1909 /* 1910 * Lookup the root dataset directory 1911 */ 1912 if (zap_lookup(spa, &dir, DMU_POOL_ROOT_DATASET, &root) 1913 || objset_get_dnode(spa, &spa->spa_mos, root, &dir)) { 1914 printf("ZFS: can't find root dsl_dir\n"); 1915 return (EIO); 1916 } 1917 1918 /* 1919 * Use the information from the dataset directory's bonus buffer 1920 * to find the dataset object and from that the object set itself. 1921 */ 1922 dsl_dir_phys_t *dd = (dsl_dir_phys_t *) &dir.dn_bonus; 1923 *objid = dd->dd_head_dataset_obj; 1924 return (0); 1925} 1926 1927static int 1928zfs_mount(const spa_t *spa, uint64_t rootobj, struct zfsmount *mount) 1929{ 1930 1931 mount->spa = spa; 1932 1933 /* 1934 * Find the root object set if not explicitly provided 1935 */ 1936 if (rootobj == 0 && zfs_get_root(spa, &rootobj)) { 1937 printf("ZFS: can't find root filesystem\n"); 1938 return (EIO); 1939 } 1940 1941 if (zfs_mount_dataset(spa, rootobj, &mount->objset)) { 1942 printf("ZFS: can't open root filesystem\n"); 1943 return (EIO); 1944 } 1945 1946 mount->rootobj = rootobj; 1947 1948 return (0); 1949} 1950 1951static int 1952zfs_spa_init(spa_t *spa) 1953{ 1954 1955 if (zio_read(spa, &spa->spa_uberblock.ub_rootbp, &spa->spa_mos)) { 1956 printf("ZFS: can't read MOS of pool %s\n", spa->spa_name); 1957 return (EIO); 1958 } 1959 if (spa->spa_mos.os_type != DMU_OST_META) { 1960 printf("ZFS: corrupted MOS of pool %s\n", spa->spa_name); 1961 return (EIO); 1962 } 1963 return (0); 1964} 1965 1966static int 1967zfs_dnode_stat(const spa_t *spa, dnode_phys_t *dn, struct stat *sb) 1968{ 1969 1970 if (dn->dn_bonustype != DMU_OT_SA) { 1971 znode_phys_t *zp = (znode_phys_t *)dn->dn_bonus; 1972 1973 sb->st_mode = zp->zp_mode; 1974 sb->st_uid = zp->zp_uid; 1975 sb->st_gid = zp->zp_gid; 1976 sb->st_size = zp->zp_size; 1977 } else { 1978 sa_hdr_phys_t *sahdrp; 1979 int hdrsize; 1980 size_t size = 0; 1981 void *buf = NULL; 1982 1983 if (dn->dn_bonuslen != 0) 1984 sahdrp = (sa_hdr_phys_t *)DN_BONUS(dn); 1985 else { 1986 if ((dn->dn_flags & DNODE_FLAG_SPILL_BLKPTR) != 0) { 1987 blkptr_t *bp = &dn->dn_spill; 1988 int error; 1989 1990 size = BP_GET_LSIZE(bp); 1991 buf = zfs_alloc(size); 1992 error = zio_read(spa, bp, buf); 1993 if (error != 0) { 1994 zfs_free(buf, size); 1995 return (error); 1996 } 1997 sahdrp = buf; 1998 } else { 1999 return (EIO); 2000 } 2001 } 2002 hdrsize = SA_HDR_SIZE(sahdrp); 2003 sb->st_mode = *(uint64_t *)((char *)sahdrp + hdrsize + 2004 SA_MODE_OFFSET); 2005 sb->st_uid = *(uint64_t *)((char *)sahdrp + hdrsize + 2006 SA_UID_OFFSET); 2007 sb->st_gid = *(uint64_t *)((char *)sahdrp + hdrsize + 2008 SA_GID_OFFSET); 2009 sb->st_size = *(uint64_t *)((char *)sahdrp + hdrsize + 2010 SA_SIZE_OFFSET); 2011 if (buf != NULL) 2012 zfs_free(buf, size); 2013 } 2014 2015 return (0); 2016} 2017 2018/* 2019 * Lookup a file and return its dnode. 2020 */ 2021static int 2022zfs_lookup(const struct zfsmount *mount, const char *upath, dnode_phys_t *dnode) 2023{ 2024 int rc; 2025 uint64_t objnum, rootnum, parentnum; 2026 const spa_t *spa; 2027 dnode_phys_t dn; 2028 const char *p, *q; 2029 char element[256]; 2030 char path[1024]; 2031 int symlinks_followed = 0; 2032 struct stat sb; 2033 2034 spa = mount->spa; 2035 if (mount->objset.os_type != DMU_OST_ZFS) { 2036 printf("ZFS: unexpected object set type %ju\n", 2037 (uintmax_t)mount->objset.os_type); 2038 return (EIO); 2039 } 2040 2041 /* 2042 * Get the root directory dnode. 2043 */ 2044 rc = objset_get_dnode(spa, &mount->objset, MASTER_NODE_OBJ, &dn); 2045 if (rc) 2046 return (rc); 2047 2048 rc = zap_lookup(spa, &dn, ZFS_ROOT_OBJ, &rootnum); 2049 if (rc) 2050 return (rc); 2051 2052 rc = objset_get_dnode(spa, &mount->objset, rootnum, &dn); 2053 if (rc) 2054 return (rc); 2055 2056 objnum = rootnum; 2057 p = upath; 2058 while (p && *p) { 2059 while (*p == '/') 2060 p++; 2061 if (!*p) 2062 break; 2063 q = strchr(p, '/'); 2064 if (q) { 2065 memcpy(element, p, q - p); 2066 element[q - p] = 0; 2067 p = q; 2068 } else { 2069 strcpy(element, p); 2070 p = 0; 2071 } 2072 2073 rc = zfs_dnode_stat(spa, &dn, &sb); 2074 if (rc) 2075 return (rc); 2076 if (!S_ISDIR(sb.st_mode)) 2077 return (ENOTDIR); 2078 2079 parentnum = objnum; 2080 rc = zap_lookup(spa, &dn, element, &objnum); 2081 if (rc) 2082 return (rc); 2083 objnum = ZFS_DIRENT_OBJ(objnum); 2084 2085 rc = objset_get_dnode(spa, &mount->objset, objnum, &dn); 2086 if (rc) 2087 return (rc); 2088 2089 /* 2090 * Check for symlink. 2091 */ 2092 rc = zfs_dnode_stat(spa, &dn, &sb); 2093 if (rc) 2094 return (rc); 2095 if (S_ISLNK(sb.st_mode)) { 2096 if (symlinks_followed > 10) 2097 return (EMLINK); 2098 symlinks_followed++; 2099 2100 /* 2101 * Read the link value and copy the tail of our 2102 * current path onto the end. 2103 */ 2104 if (p) 2105 strcpy(&path[sb.st_size], p); 2106 else 2107 path[sb.st_size] = 0; 2108 if (sb.st_size + sizeof(znode_phys_t) <= dn.dn_bonuslen) { 2109 memcpy(path, &dn.dn_bonus[sizeof(znode_phys_t)], 2110 sb.st_size); 2111 } else { 2112 rc = dnode_read(spa, &dn, 0, path, sb.st_size); 2113 if (rc) 2114 return (rc); 2115 } 2116 2117 /* 2118 * Restart with the new path, starting either at 2119 * the root or at the parent depending whether or 2120 * not the link is relative. 2121 */ 2122 p = path; 2123 if (*p == '/') 2124 objnum = rootnum; 2125 else 2126 objnum = parentnum; 2127 objset_get_dnode(spa, &mount->objset, objnum, &dn); 2128 } 2129 } 2130 2131 *dnode = dn; 2132 return (0); 2133} 2134