zfsimpl.c revision 316321
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 316321 2017-03-31 04:44:37Z ngie $"); 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 "org.open-zfs:large_blocks", 61 NULL 62}; 63 64/* 65 * List of all pools, chained through spa_link. 66 */ 67static spa_list_t zfs_pools; 68 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 if (bsize > SPA_MAXBLOCKSIZE) { 1226 printf("ZFS: I/O error - blocks larger than 128K are not supported\n"); 1227 return (EIO); 1228 } 1229 1230 /* 1231 * Note: bsize may not be a power of two here so we need to do an 1232 * actual divide rather than a bitshift. 1233 */ 1234 while (buflen > 0) { 1235 uint64_t bn = offset / bsize; 1236 int boff = offset % bsize; 1237 int ibn; 1238 const blkptr_t *indbp; 1239 blkptr_t bp; 1240 1241 if (bn > dnode->dn_maxblkid) 1242 return (EIO); 1243 1244 if (dnode == dnode_cache_obj && bn == dnode_cache_bn) 1245 goto cached; 1246 1247 indbp = dnode->dn_blkptr; 1248 for (i = 0; i < nlevels; i++) { 1249 /* 1250 * Copy the bp from the indirect array so that 1251 * we can re-use the scratch buffer for multi-level 1252 * objects. 1253 */ 1254 ibn = bn >> ((nlevels - i - 1) * ibshift); 1255 ibn &= ((1 << ibshift) - 1); 1256 bp = indbp[ibn]; 1257 if (BP_IS_HOLE(&bp)) { 1258 memset(dnode_cache_buf, 0, bsize); 1259 break; 1260 } 1261 rc = zio_read(spa, &bp, dnode_cache_buf); 1262 if (rc) 1263 return (rc); 1264 indbp = (const blkptr_t *) dnode_cache_buf; 1265 } 1266 dnode_cache_obj = dnode; 1267 dnode_cache_bn = bn; 1268 cached: 1269 1270 /* 1271 * The buffer contains our data block. Copy what we 1272 * need from it and loop. 1273 */ 1274 i = bsize - boff; 1275 if (i > buflen) i = buflen; 1276 memcpy(buf, &dnode_cache_buf[boff], i); 1277 buf = ((char*) buf) + i; 1278 offset += i; 1279 buflen -= i; 1280 } 1281 1282 return (0); 1283} 1284 1285/* 1286 * Lookup a value in a microzap directory. Assumes that the zap 1287 * scratch buffer contains the directory contents. 1288 */ 1289static int 1290mzap_lookup(const dnode_phys_t *dnode, const char *name, uint64_t *value) 1291{ 1292 const mzap_phys_t *mz; 1293 const mzap_ent_phys_t *mze; 1294 size_t size; 1295 int chunks, i; 1296 1297 /* 1298 * Microzap objects use exactly one block. Read the whole 1299 * thing. 1300 */ 1301 size = dnode->dn_datablkszsec * 512; 1302 1303 mz = (const mzap_phys_t *) zap_scratch; 1304 chunks = size / MZAP_ENT_LEN - 1; 1305 1306 for (i = 0; i < chunks; i++) { 1307 mze = &mz->mz_chunk[i]; 1308 if (!strcmp(mze->mze_name, name)) { 1309 *value = mze->mze_value; 1310 return (0); 1311 } 1312 } 1313 1314 return (ENOENT); 1315} 1316 1317/* 1318 * Compare a name with a zap leaf entry. Return non-zero if the name 1319 * matches. 1320 */ 1321static int 1322fzap_name_equal(const zap_leaf_t *zl, const zap_leaf_chunk_t *zc, const char *name) 1323{ 1324 size_t namelen; 1325 const zap_leaf_chunk_t *nc; 1326 const char *p; 1327 1328 namelen = zc->l_entry.le_name_numints; 1329 1330 nc = &ZAP_LEAF_CHUNK(zl, zc->l_entry.le_name_chunk); 1331 p = name; 1332 while (namelen > 0) { 1333 size_t len; 1334 len = namelen; 1335 if (len > ZAP_LEAF_ARRAY_BYTES) 1336 len = ZAP_LEAF_ARRAY_BYTES; 1337 if (memcmp(p, nc->l_array.la_array, len)) 1338 return (0); 1339 p += len; 1340 namelen -= len; 1341 nc = &ZAP_LEAF_CHUNK(zl, nc->l_array.la_next); 1342 } 1343 1344 return 1; 1345} 1346 1347/* 1348 * Extract a uint64_t value from a zap leaf entry. 1349 */ 1350static uint64_t 1351fzap_leaf_value(const zap_leaf_t *zl, const zap_leaf_chunk_t *zc) 1352{ 1353 const zap_leaf_chunk_t *vc; 1354 int i; 1355 uint64_t value; 1356 const uint8_t *p; 1357 1358 vc = &ZAP_LEAF_CHUNK(zl, zc->l_entry.le_value_chunk); 1359 for (i = 0, value = 0, p = vc->l_array.la_array; i < 8; i++) { 1360 value = (value << 8) | p[i]; 1361 } 1362 1363 return value; 1364} 1365 1366/* 1367 * Lookup a value in a fatzap directory. Assumes that the zap scratch 1368 * buffer contains the directory header. 1369 */ 1370static int 1371fzap_lookup(const spa_t *spa, const dnode_phys_t *dnode, const char *name, uint64_t *value) 1372{ 1373 int bsize = dnode->dn_datablkszsec << SPA_MINBLOCKSHIFT; 1374 zap_phys_t zh = *(zap_phys_t *) zap_scratch; 1375 fat_zap_t z; 1376 uint64_t *ptrtbl; 1377 uint64_t hash; 1378 int rc; 1379 1380 if (zh.zap_magic != ZAP_MAGIC) 1381 return (EIO); 1382 1383 z.zap_block_shift = ilog2(bsize); 1384 z.zap_phys = (zap_phys_t *) zap_scratch; 1385 1386 /* 1387 * Figure out where the pointer table is and read it in if necessary. 1388 */ 1389 if (zh.zap_ptrtbl.zt_blk) { 1390 rc = dnode_read(spa, dnode, zh.zap_ptrtbl.zt_blk * bsize, 1391 zap_scratch, bsize); 1392 if (rc) 1393 return (rc); 1394 ptrtbl = (uint64_t *) zap_scratch; 1395 } else { 1396 ptrtbl = &ZAP_EMBEDDED_PTRTBL_ENT(&z, 0); 1397 } 1398 1399 hash = zap_hash(zh.zap_salt, name); 1400 1401 zap_leaf_t zl; 1402 zl.l_bs = z.zap_block_shift; 1403 1404 off_t off = ptrtbl[hash >> (64 - zh.zap_ptrtbl.zt_shift)] << zl.l_bs; 1405 zap_leaf_chunk_t *zc; 1406 1407 rc = dnode_read(spa, dnode, off, zap_scratch, bsize); 1408 if (rc) 1409 return (rc); 1410 1411 zl.l_phys = (zap_leaf_phys_t *) zap_scratch; 1412 1413 /* 1414 * Make sure this chunk matches our hash. 1415 */ 1416 if (zl.l_phys->l_hdr.lh_prefix_len > 0 1417 && zl.l_phys->l_hdr.lh_prefix 1418 != hash >> (64 - zl.l_phys->l_hdr.lh_prefix_len)) 1419 return (ENOENT); 1420 1421 /* 1422 * Hash within the chunk to find our entry. 1423 */ 1424 int shift = (64 - ZAP_LEAF_HASH_SHIFT(&zl) - zl.l_phys->l_hdr.lh_prefix_len); 1425 int h = (hash >> shift) & ((1 << ZAP_LEAF_HASH_SHIFT(&zl)) - 1); 1426 h = zl.l_phys->l_hash[h]; 1427 if (h == 0xffff) 1428 return (ENOENT); 1429 zc = &ZAP_LEAF_CHUNK(&zl, h); 1430 while (zc->l_entry.le_hash != hash) { 1431 if (zc->l_entry.le_next == 0xffff) { 1432 zc = 0; 1433 break; 1434 } 1435 zc = &ZAP_LEAF_CHUNK(&zl, zc->l_entry.le_next); 1436 } 1437 if (fzap_name_equal(&zl, zc, name)) { 1438 if (zc->l_entry.le_value_intlen * zc->l_entry.le_value_numints > 8) 1439 return (E2BIG); 1440 *value = fzap_leaf_value(&zl, zc); 1441 return (0); 1442 } 1443 1444 return (ENOENT); 1445} 1446 1447/* 1448 * Lookup a name in a zap object and return its value as a uint64_t. 1449 */ 1450static int 1451zap_lookup(const spa_t *spa, const dnode_phys_t *dnode, const char *name, uint64_t *value) 1452{ 1453 int rc; 1454 uint64_t zap_type; 1455 size_t size = dnode->dn_datablkszsec << SPA_MINBLOCKSHIFT; 1456 1457 rc = dnode_read(spa, dnode, 0, zap_scratch, size); 1458 if (rc) 1459 return (rc); 1460 1461 zap_type = *(uint64_t *) zap_scratch; 1462 if (zap_type == ZBT_MICRO) 1463 return mzap_lookup(dnode, name, value); 1464 else if (zap_type == ZBT_HEADER) 1465 return fzap_lookup(spa, dnode, name, value); 1466 printf("ZFS: invalid zap_type=%d\n", (int)zap_type); 1467 return (EIO); 1468} 1469 1470/* 1471 * List a microzap directory. Assumes that the zap scratch buffer contains 1472 * the directory contents. 1473 */ 1474static int 1475mzap_list(const dnode_phys_t *dnode, int (*callback)(const char *)) 1476{ 1477 const mzap_phys_t *mz; 1478 const mzap_ent_phys_t *mze; 1479 size_t size; 1480 int chunks, i; 1481 1482 /* 1483 * Microzap objects use exactly one block. Read the whole 1484 * thing. 1485 */ 1486 size = dnode->dn_datablkszsec * 512; 1487 mz = (const mzap_phys_t *) zap_scratch; 1488 chunks = size / MZAP_ENT_LEN - 1; 1489 1490 for (i = 0; i < chunks; i++) { 1491 mze = &mz->mz_chunk[i]; 1492 if (mze->mze_name[0]) 1493 //printf("%-32s 0x%jx\n", mze->mze_name, (uintmax_t)mze->mze_value); 1494 callback(mze->mze_name); 1495 } 1496 1497 return (0); 1498} 1499 1500/* 1501 * List a fatzap directory. Assumes that the zap scratch buffer contains 1502 * the directory header. 1503 */ 1504static int 1505fzap_list(const spa_t *spa, const dnode_phys_t *dnode, int (*callback)(const char *)) 1506{ 1507 int bsize = dnode->dn_datablkszsec << SPA_MINBLOCKSHIFT; 1508 zap_phys_t zh = *(zap_phys_t *) zap_scratch; 1509 fat_zap_t z; 1510 int i, j; 1511 1512 if (zh.zap_magic != ZAP_MAGIC) 1513 return (EIO); 1514 1515 z.zap_block_shift = ilog2(bsize); 1516 z.zap_phys = (zap_phys_t *) zap_scratch; 1517 1518 /* 1519 * This assumes that the leaf blocks start at block 1. The 1520 * documentation isn't exactly clear on this. 1521 */ 1522 zap_leaf_t zl; 1523 zl.l_bs = z.zap_block_shift; 1524 for (i = 0; i < zh.zap_num_leafs; i++) { 1525 off_t off = (i + 1) << zl.l_bs; 1526 char name[256], *p; 1527 uint64_t value; 1528 1529 if (dnode_read(spa, dnode, off, zap_scratch, bsize)) 1530 return (EIO); 1531 1532 zl.l_phys = (zap_leaf_phys_t *) zap_scratch; 1533 1534 for (j = 0; j < ZAP_LEAF_NUMCHUNKS(&zl); j++) { 1535 zap_leaf_chunk_t *zc, *nc; 1536 int namelen; 1537 1538 zc = &ZAP_LEAF_CHUNK(&zl, j); 1539 if (zc->l_entry.le_type != ZAP_CHUNK_ENTRY) 1540 continue; 1541 namelen = zc->l_entry.le_name_numints; 1542 if (namelen > sizeof(name)) 1543 namelen = sizeof(name); 1544 1545 /* 1546 * Paste the name back together. 1547 */ 1548 nc = &ZAP_LEAF_CHUNK(&zl, zc->l_entry.le_name_chunk); 1549 p = name; 1550 while (namelen > 0) { 1551 int len; 1552 len = namelen; 1553 if (len > ZAP_LEAF_ARRAY_BYTES) 1554 len = ZAP_LEAF_ARRAY_BYTES; 1555 memcpy(p, nc->l_array.la_array, len); 1556 p += len; 1557 namelen -= len; 1558 nc = &ZAP_LEAF_CHUNK(&zl, nc->l_array.la_next); 1559 } 1560 1561 /* 1562 * Assume the first eight bytes of the value are 1563 * a uint64_t. 1564 */ 1565 value = fzap_leaf_value(&zl, zc); 1566 1567 //printf("%s 0x%jx\n", name, (uintmax_t)value); 1568 callback((const char *)name); 1569 } 1570 } 1571 1572 return (0); 1573} 1574 1575static int zfs_printf(const char *name) 1576{ 1577 1578 printf("%s\n", name); 1579 1580 return (0); 1581} 1582 1583/* 1584 * List a zap directory. 1585 */ 1586static int 1587zap_list(const spa_t *spa, const dnode_phys_t *dnode) 1588{ 1589 uint64_t zap_type; 1590 size_t size = dnode->dn_datablkszsec * 512; 1591 1592 if (dnode_read(spa, dnode, 0, zap_scratch, size)) 1593 return (EIO); 1594 1595 zap_type = *(uint64_t *) zap_scratch; 1596 if (zap_type == ZBT_MICRO) 1597 return mzap_list(dnode, zfs_printf); 1598 else 1599 return fzap_list(spa, dnode, zfs_printf); 1600} 1601 1602static int 1603objset_get_dnode(const spa_t *spa, const objset_phys_t *os, uint64_t objnum, dnode_phys_t *dnode) 1604{ 1605 off_t offset; 1606 1607 offset = objnum * sizeof(dnode_phys_t); 1608 return dnode_read(spa, &os->os_meta_dnode, offset, 1609 dnode, sizeof(dnode_phys_t)); 1610} 1611 1612static int 1613mzap_rlookup(const spa_t *spa, const dnode_phys_t *dnode, char *name, uint64_t value) 1614{ 1615 const mzap_phys_t *mz; 1616 const mzap_ent_phys_t *mze; 1617 size_t size; 1618 int chunks, i; 1619 1620 /* 1621 * Microzap objects use exactly one block. Read the whole 1622 * thing. 1623 */ 1624 size = dnode->dn_datablkszsec * 512; 1625 1626 mz = (const mzap_phys_t *) zap_scratch; 1627 chunks = size / MZAP_ENT_LEN - 1; 1628 1629 for (i = 0; i < chunks; i++) { 1630 mze = &mz->mz_chunk[i]; 1631 if (value == mze->mze_value) { 1632 strcpy(name, mze->mze_name); 1633 return (0); 1634 } 1635 } 1636 1637 return (ENOENT); 1638} 1639 1640static void 1641fzap_name_copy(const zap_leaf_t *zl, const zap_leaf_chunk_t *zc, char *name) 1642{ 1643 size_t namelen; 1644 const zap_leaf_chunk_t *nc; 1645 char *p; 1646 1647 namelen = zc->l_entry.le_name_numints; 1648 1649 nc = &ZAP_LEAF_CHUNK(zl, zc->l_entry.le_name_chunk); 1650 p = name; 1651 while (namelen > 0) { 1652 size_t len; 1653 len = namelen; 1654 if (len > ZAP_LEAF_ARRAY_BYTES) 1655 len = ZAP_LEAF_ARRAY_BYTES; 1656 memcpy(p, nc->l_array.la_array, len); 1657 p += len; 1658 namelen -= len; 1659 nc = &ZAP_LEAF_CHUNK(zl, nc->l_array.la_next); 1660 } 1661 1662 *p = '\0'; 1663} 1664 1665static int 1666fzap_rlookup(const spa_t *spa, const dnode_phys_t *dnode, char *name, uint64_t value) 1667{ 1668 int bsize = dnode->dn_datablkszsec << SPA_MINBLOCKSHIFT; 1669 zap_phys_t zh = *(zap_phys_t *) zap_scratch; 1670 fat_zap_t z; 1671 int i, j; 1672 1673 if (zh.zap_magic != ZAP_MAGIC) 1674 return (EIO); 1675 1676 z.zap_block_shift = ilog2(bsize); 1677 z.zap_phys = (zap_phys_t *) zap_scratch; 1678 1679 /* 1680 * This assumes that the leaf blocks start at block 1. The 1681 * documentation isn't exactly clear on this. 1682 */ 1683 zap_leaf_t zl; 1684 zl.l_bs = z.zap_block_shift; 1685 for (i = 0; i < zh.zap_num_leafs; i++) { 1686 off_t off = (i + 1) << zl.l_bs; 1687 1688 if (dnode_read(spa, dnode, off, zap_scratch, bsize)) 1689 return (EIO); 1690 1691 zl.l_phys = (zap_leaf_phys_t *) zap_scratch; 1692 1693 for (j = 0; j < ZAP_LEAF_NUMCHUNKS(&zl); j++) { 1694 zap_leaf_chunk_t *zc; 1695 1696 zc = &ZAP_LEAF_CHUNK(&zl, j); 1697 if (zc->l_entry.le_type != ZAP_CHUNK_ENTRY) 1698 continue; 1699 if (zc->l_entry.le_value_intlen != 8 || 1700 zc->l_entry.le_value_numints != 1) 1701 continue; 1702 1703 if (fzap_leaf_value(&zl, zc) == value) { 1704 fzap_name_copy(&zl, zc, name); 1705 return (0); 1706 } 1707 } 1708 } 1709 1710 return (ENOENT); 1711} 1712 1713static int 1714zap_rlookup(const spa_t *spa, const dnode_phys_t *dnode, char *name, uint64_t value) 1715{ 1716 int rc; 1717 uint64_t zap_type; 1718 size_t size = dnode->dn_datablkszsec * 512; 1719 1720 rc = dnode_read(spa, dnode, 0, zap_scratch, size); 1721 if (rc) 1722 return (rc); 1723 1724 zap_type = *(uint64_t *) zap_scratch; 1725 if (zap_type == ZBT_MICRO) 1726 return mzap_rlookup(spa, dnode, name, value); 1727 else 1728 return fzap_rlookup(spa, dnode, name, value); 1729} 1730 1731static int 1732zfs_rlookup(const spa_t *spa, uint64_t objnum, char *result) 1733{ 1734 char name[256]; 1735 char component[256]; 1736 uint64_t dir_obj, parent_obj, child_dir_zapobj; 1737 dnode_phys_t child_dir_zap, dataset, dir, parent; 1738 dsl_dir_phys_t *dd; 1739 dsl_dataset_phys_t *ds; 1740 char *p; 1741 int len; 1742 1743 p = &name[sizeof(name) - 1]; 1744 *p = '\0'; 1745 1746 if (objset_get_dnode(spa, &spa->spa_mos, objnum, &dataset)) { 1747 printf("ZFS: can't find dataset %ju\n", (uintmax_t)objnum); 1748 return (EIO); 1749 } 1750 ds = (dsl_dataset_phys_t *)&dataset.dn_bonus; 1751 dir_obj = ds->ds_dir_obj; 1752 1753 for (;;) { 1754 if (objset_get_dnode(spa, &spa->spa_mos, dir_obj, &dir) != 0) 1755 return (EIO); 1756 dd = (dsl_dir_phys_t *)&dir.dn_bonus; 1757 1758 /* Actual loop condition. */ 1759 parent_obj = dd->dd_parent_obj; 1760 if (parent_obj == 0) 1761 break; 1762 1763 if (objset_get_dnode(spa, &spa->spa_mos, parent_obj, &parent) != 0) 1764 return (EIO); 1765 dd = (dsl_dir_phys_t *)&parent.dn_bonus; 1766 child_dir_zapobj = dd->dd_child_dir_zapobj; 1767 if (objset_get_dnode(spa, &spa->spa_mos, child_dir_zapobj, &child_dir_zap) != 0) 1768 return (EIO); 1769 if (zap_rlookup(spa, &child_dir_zap, component, dir_obj) != 0) 1770 return (EIO); 1771 1772 len = strlen(component); 1773 p -= len; 1774 memcpy(p, component, len); 1775 --p; 1776 *p = '/'; 1777 1778 /* Actual loop iteration. */ 1779 dir_obj = parent_obj; 1780 } 1781 1782 if (*p != '\0') 1783 ++p; 1784 strcpy(result, p); 1785 1786 return (0); 1787} 1788 1789static int 1790zfs_lookup_dataset(const spa_t *spa, const char *name, uint64_t *objnum) 1791{ 1792 char element[256]; 1793 uint64_t dir_obj, child_dir_zapobj; 1794 dnode_phys_t child_dir_zap, dir; 1795 dsl_dir_phys_t *dd; 1796 const char *p, *q; 1797 1798 if (objset_get_dnode(spa, &spa->spa_mos, DMU_POOL_DIRECTORY_OBJECT, &dir)) 1799 return (EIO); 1800 if (zap_lookup(spa, &dir, DMU_POOL_ROOT_DATASET, &dir_obj)) 1801 return (EIO); 1802 1803 p = name; 1804 for (;;) { 1805 if (objset_get_dnode(spa, &spa->spa_mos, dir_obj, &dir)) 1806 return (EIO); 1807 dd = (dsl_dir_phys_t *)&dir.dn_bonus; 1808 1809 while (*p == '/') 1810 p++; 1811 /* Actual loop condition #1. */ 1812 if (*p == '\0') 1813 break; 1814 1815 q = strchr(p, '/'); 1816 if (q) { 1817 memcpy(element, p, q - p); 1818 element[q - p] = '\0'; 1819 p = q + 1; 1820 } else { 1821 strcpy(element, p); 1822 p += strlen(p); 1823 } 1824 1825 child_dir_zapobj = dd->dd_child_dir_zapobj; 1826 if (objset_get_dnode(spa, &spa->spa_mos, child_dir_zapobj, &child_dir_zap) != 0) 1827 return (EIO); 1828 1829 /* Actual loop condition #2. */ 1830 if (zap_lookup(spa, &child_dir_zap, element, &dir_obj) != 0) 1831 return (ENOENT); 1832 } 1833 1834 *objnum = dd->dd_head_dataset_obj; 1835 return (0); 1836} 1837 1838#ifndef BOOT2 1839static int 1840zfs_list_dataset(const spa_t *spa, uint64_t objnum/*, int pos, char *entry*/) 1841{ 1842 uint64_t dir_obj, child_dir_zapobj; 1843 dnode_phys_t child_dir_zap, dir, dataset; 1844 dsl_dataset_phys_t *ds; 1845 dsl_dir_phys_t *dd; 1846 1847 if (objset_get_dnode(spa, &spa->spa_mos, objnum, &dataset)) { 1848 printf("ZFS: can't find dataset %ju\n", (uintmax_t)objnum); 1849 return (EIO); 1850 } 1851 ds = (dsl_dataset_phys_t *) &dataset.dn_bonus; 1852 dir_obj = ds->ds_dir_obj; 1853 1854 if (objset_get_dnode(spa, &spa->spa_mos, dir_obj, &dir)) { 1855 printf("ZFS: can't find dirobj %ju\n", (uintmax_t)dir_obj); 1856 return (EIO); 1857 } 1858 dd = (dsl_dir_phys_t *)&dir.dn_bonus; 1859 1860 child_dir_zapobj = dd->dd_child_dir_zapobj; 1861 if (objset_get_dnode(spa, &spa->spa_mos, child_dir_zapobj, &child_dir_zap) != 0) { 1862 printf("ZFS: can't find child zap %ju\n", (uintmax_t)dir_obj); 1863 return (EIO); 1864 } 1865 1866 return (zap_list(spa, &child_dir_zap) != 0); 1867} 1868 1869int 1870zfs_callback_dataset(const spa_t *spa, uint64_t objnum, int (*callback)(const char *name)) 1871{ 1872 uint64_t dir_obj, child_dir_zapobj, zap_type; 1873 dnode_phys_t child_dir_zap, dir, dataset; 1874 dsl_dataset_phys_t *ds; 1875 dsl_dir_phys_t *dd; 1876 int err; 1877 1878 err = objset_get_dnode(spa, &spa->spa_mos, objnum, &dataset); 1879 if (err != 0) { 1880 printf("ZFS: can't find dataset %ju\n", (uintmax_t)objnum); 1881 return (err); 1882 } 1883 ds = (dsl_dataset_phys_t *) &dataset.dn_bonus; 1884 dir_obj = ds->ds_dir_obj; 1885 1886 err = objset_get_dnode(spa, &spa->spa_mos, dir_obj, &dir); 1887 if (err != 0) { 1888 printf("ZFS: can't find dirobj %ju\n", (uintmax_t)dir_obj); 1889 return (err); 1890 } 1891 dd = (dsl_dir_phys_t *)&dir.dn_bonus; 1892 1893 child_dir_zapobj = dd->dd_child_dir_zapobj; 1894 err = objset_get_dnode(spa, &spa->spa_mos, child_dir_zapobj, &child_dir_zap); 1895 if (err != 0) { 1896 printf("ZFS: can't find child zap %ju\n", (uintmax_t)dir_obj); 1897 return (err); 1898 } 1899 1900 err = dnode_read(spa, &child_dir_zap, 0, zap_scratch, child_dir_zap.dn_datablkszsec * 512); 1901 if (err != 0) 1902 return (err); 1903 1904 zap_type = *(uint64_t *) zap_scratch; 1905 if (zap_type == ZBT_MICRO) 1906 return mzap_list(&child_dir_zap, callback); 1907 else 1908 return fzap_list(spa, &child_dir_zap, callback); 1909} 1910#endif 1911 1912/* 1913 * Find the object set given the object number of its dataset object 1914 * and return its details in *objset 1915 */ 1916static int 1917zfs_mount_dataset(const spa_t *spa, uint64_t objnum, objset_phys_t *objset) 1918{ 1919 dnode_phys_t dataset; 1920 dsl_dataset_phys_t *ds; 1921 1922 if (objset_get_dnode(spa, &spa->spa_mos, objnum, &dataset)) { 1923 printf("ZFS: can't find dataset %ju\n", (uintmax_t)objnum); 1924 return (EIO); 1925 } 1926 1927 ds = (dsl_dataset_phys_t *) &dataset.dn_bonus; 1928 if (zio_read(spa, &ds->ds_bp, objset)) { 1929 printf("ZFS: can't read object set for dataset %ju\n", 1930 (uintmax_t)objnum); 1931 return (EIO); 1932 } 1933 1934 return (0); 1935} 1936 1937/* 1938 * Find the object set pointed to by the BOOTFS property or the root 1939 * dataset if there is none and return its details in *objset 1940 */ 1941static int 1942zfs_get_root(const spa_t *spa, uint64_t *objid) 1943{ 1944 dnode_phys_t dir, propdir; 1945 uint64_t props, bootfs, root; 1946 1947 *objid = 0; 1948 1949 /* 1950 * Start with the MOS directory object. 1951 */ 1952 if (objset_get_dnode(spa, &spa->spa_mos, DMU_POOL_DIRECTORY_OBJECT, &dir)) { 1953 printf("ZFS: can't read MOS object directory\n"); 1954 return (EIO); 1955 } 1956 1957 /* 1958 * Lookup the pool_props and see if we can find a bootfs. 1959 */ 1960 if (zap_lookup(spa, &dir, DMU_POOL_PROPS, &props) == 0 1961 && objset_get_dnode(spa, &spa->spa_mos, props, &propdir) == 0 1962 && zap_lookup(spa, &propdir, "bootfs", &bootfs) == 0 1963 && bootfs != 0) 1964 { 1965 *objid = bootfs; 1966 return (0); 1967 } 1968 /* 1969 * Lookup the root dataset directory 1970 */ 1971 if (zap_lookup(spa, &dir, DMU_POOL_ROOT_DATASET, &root) 1972 || objset_get_dnode(spa, &spa->spa_mos, root, &dir)) { 1973 printf("ZFS: can't find root dsl_dir\n"); 1974 return (EIO); 1975 } 1976 1977 /* 1978 * Use the information from the dataset directory's bonus buffer 1979 * to find the dataset object and from that the object set itself. 1980 */ 1981 dsl_dir_phys_t *dd = (dsl_dir_phys_t *) &dir.dn_bonus; 1982 *objid = dd->dd_head_dataset_obj; 1983 return (0); 1984} 1985 1986static int 1987zfs_mount(const spa_t *spa, uint64_t rootobj, struct zfsmount *mount) 1988{ 1989 1990 mount->spa = spa; 1991 1992 /* 1993 * Find the root object set if not explicitly provided 1994 */ 1995 if (rootobj == 0 && zfs_get_root(spa, &rootobj)) { 1996 printf("ZFS: can't find root filesystem\n"); 1997 return (EIO); 1998 } 1999 2000 if (zfs_mount_dataset(spa, rootobj, &mount->objset)) { 2001 printf("ZFS: can't open root filesystem\n"); 2002 return (EIO); 2003 } 2004 2005 mount->rootobj = rootobj; 2006 2007 return (0); 2008} 2009 2010static int 2011zfs_spa_init(spa_t *spa) 2012{ 2013 2014 if (zio_read(spa, &spa->spa_uberblock.ub_rootbp, &spa->spa_mos)) { 2015 printf("ZFS: can't read MOS of pool %s\n", spa->spa_name); 2016 return (EIO); 2017 } 2018 if (spa->spa_mos.os_type != DMU_OST_META) { 2019 printf("ZFS: corrupted MOS of pool %s\n", spa->spa_name); 2020 return (EIO); 2021 } 2022 return (0); 2023} 2024 2025static int 2026zfs_dnode_stat(const spa_t *spa, dnode_phys_t *dn, struct stat *sb) 2027{ 2028 2029 if (dn->dn_bonustype != DMU_OT_SA) { 2030 znode_phys_t *zp = (znode_phys_t *)dn->dn_bonus; 2031 2032 sb->st_mode = zp->zp_mode; 2033 sb->st_uid = zp->zp_uid; 2034 sb->st_gid = zp->zp_gid; 2035 sb->st_size = zp->zp_size; 2036 } else { 2037 sa_hdr_phys_t *sahdrp; 2038 int hdrsize; 2039 size_t size = 0; 2040 void *buf = NULL; 2041 2042 if (dn->dn_bonuslen != 0) 2043 sahdrp = (sa_hdr_phys_t *)DN_BONUS(dn); 2044 else { 2045 if ((dn->dn_flags & DNODE_FLAG_SPILL_BLKPTR) != 0) { 2046 blkptr_t *bp = &dn->dn_spill; 2047 int error; 2048 2049 size = BP_GET_LSIZE(bp); 2050 buf = zfs_alloc(size); 2051 error = zio_read(spa, bp, buf); 2052 if (error != 0) { 2053 zfs_free(buf, size); 2054 return (error); 2055 } 2056 sahdrp = buf; 2057 } else { 2058 return (EIO); 2059 } 2060 } 2061 hdrsize = SA_HDR_SIZE(sahdrp); 2062 sb->st_mode = *(uint64_t *)((char *)sahdrp + hdrsize + 2063 SA_MODE_OFFSET); 2064 sb->st_uid = *(uint64_t *)((char *)sahdrp + hdrsize + 2065 SA_UID_OFFSET); 2066 sb->st_gid = *(uint64_t *)((char *)sahdrp + hdrsize + 2067 SA_GID_OFFSET); 2068 sb->st_size = *(uint64_t *)((char *)sahdrp + hdrsize + 2069 SA_SIZE_OFFSET); 2070 if (buf != NULL) 2071 zfs_free(buf, size); 2072 } 2073 2074 return (0); 2075} 2076 2077/* 2078 * Lookup a file and return its dnode. 2079 */ 2080static int 2081zfs_lookup(const struct zfsmount *mount, const char *upath, dnode_phys_t *dnode) 2082{ 2083 int rc; 2084 uint64_t objnum, rootnum, parentnum; 2085 const spa_t *spa; 2086 dnode_phys_t dn; 2087 const char *p, *q; 2088 char element[256]; 2089 char path[1024]; 2090 int symlinks_followed = 0; 2091 struct stat sb; 2092 2093 spa = mount->spa; 2094 if (mount->objset.os_type != DMU_OST_ZFS) { 2095 printf("ZFS: unexpected object set type %ju\n", 2096 (uintmax_t)mount->objset.os_type); 2097 return (EIO); 2098 } 2099 2100 /* 2101 * Get the root directory dnode. 2102 */ 2103 rc = objset_get_dnode(spa, &mount->objset, MASTER_NODE_OBJ, &dn); 2104 if (rc) 2105 return (rc); 2106 2107 rc = zap_lookup(spa, &dn, ZFS_ROOT_OBJ, &rootnum); 2108 if (rc) 2109 return (rc); 2110 2111 rc = objset_get_dnode(spa, &mount->objset, rootnum, &dn); 2112 if (rc) 2113 return (rc); 2114 2115 objnum = rootnum; 2116 p = upath; 2117 while (p && *p) { 2118 while (*p == '/') 2119 p++; 2120 if (!*p) 2121 break; 2122 q = strchr(p, '/'); 2123 if (q) { 2124 memcpy(element, p, q - p); 2125 element[q - p] = 0; 2126 p = q; 2127 } else { 2128 strcpy(element, p); 2129 p = 0; 2130 } 2131 2132 rc = zfs_dnode_stat(spa, &dn, &sb); 2133 if (rc) 2134 return (rc); 2135 if (!S_ISDIR(sb.st_mode)) 2136 return (ENOTDIR); 2137 2138 parentnum = objnum; 2139 rc = zap_lookup(spa, &dn, element, &objnum); 2140 if (rc) 2141 return (rc); 2142 objnum = ZFS_DIRENT_OBJ(objnum); 2143 2144 rc = objset_get_dnode(spa, &mount->objset, objnum, &dn); 2145 if (rc) 2146 return (rc); 2147 2148 /* 2149 * Check for symlink. 2150 */ 2151 rc = zfs_dnode_stat(spa, &dn, &sb); 2152 if (rc) 2153 return (rc); 2154 if (S_ISLNK(sb.st_mode)) { 2155 if (symlinks_followed > 10) 2156 return (EMLINK); 2157 symlinks_followed++; 2158 2159 /* 2160 * Read the link value and copy the tail of our 2161 * current path onto the end. 2162 */ 2163 if (p) 2164 strcpy(&path[sb.st_size], p); 2165 else 2166 path[sb.st_size] = 0; 2167 /* 2168 * Second test is purely to silence bogus compiler 2169 * warning about accessing past the end of dn_bonus. 2170 */ 2171 if (sb.st_size + sizeof(znode_phys_t) <= 2172 dn.dn_bonuslen && sizeof(znode_phys_t) <= 2173 sizeof(dn.dn_bonus)) { 2174 memcpy(path, &dn.dn_bonus[sizeof(znode_phys_t)], 2175 sb.st_size); 2176 } else { 2177 rc = dnode_read(spa, &dn, 0, path, sb.st_size); 2178 if (rc) 2179 return (rc); 2180 } 2181 2182 /* 2183 * Restart with the new path, starting either at 2184 * the root or at the parent depending whether or 2185 * not the link is relative. 2186 */ 2187 p = path; 2188 if (*p == '/') 2189 objnum = rootnum; 2190 else 2191 objnum = parentnum; 2192 objset_get_dnode(spa, &mount->objset, objnum, &dn); 2193 } 2194 } 2195 2196 *dnode = dn; 2197 return (0); 2198} 2199