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("$FreeBSD$"); 29 30 /* 31 * Stand-alone ZFS file reader. 32 */ 33 34 #include <sys/endian.h> 35 #include <sys/stat.h> 36 #include <sys/stdint.h> 37 38 #include "zfsimpl.h" 39 #include "zfssubr.c" 40 41 42 struct zfsmount { 43 const spa_t *spa; 44 objset_phys_t objset; 45 uint64_t rootobj; 46 }; 47 static struct zfsmount zfsmount __unused; 48 49 /* 50 * List of all vdevs, chained through v_alllink. 51 */ 52 static vdev_list_t zfs_vdevs; 53 54 /* 55 * List of ZFS features supported for read 56 */ 57 static const char *features_for_read[] = { 58 "org.illumos:lz4_compress", 59 "com.delphix:hole_birth", 60 "com.delphix:extensible_dataset", 61 "com.delphix:embedded_data", 62 "org.open-zfs:large_blocks", 63 "org.illumos:sha512", 64 "org.illumos:skein", 65 "org.zfsonlinux:large_dnode", 66 "com.joyent:multi_vdev_crash_dump", 67 NULL 68 }; 69 70 /* 71 * List of all pools, chained through spa_link. 72 */ 73 static spa_list_t zfs_pools; 74 75 static const dnode_phys_t *dnode_cache_obj; 76 static uint64_t dnode_cache_bn; 77 static char *dnode_cache_buf; 78 static char *zap_scratch; 79 static char *zfs_temp_buf, *zfs_temp_end, *zfs_temp_ptr; 80 81 #define TEMP_SIZE (1024 * 1024) 82 83 static int zio_read(const spa_t *spa, const blkptr_t *bp, void *buf); 84 static int zfs_get_root(const spa_t *spa, uint64_t *objid); 85 static int zfs_rlookup(const spa_t *spa, uint64_t objnum, char *result); 86 static int zap_lookup(const spa_t *spa, const dnode_phys_t *dnode, 87 const char *name, uint64_t integer_size, uint64_t num_integers, 88 void *value); 89 90 static void 91 zfs_init(void) 92 { 93 STAILQ_INIT(&zfs_vdevs); 94 STAILQ_INIT(&zfs_pools); 95 96 zfs_temp_buf = malloc(TEMP_SIZE); 97 zfs_temp_end = zfs_temp_buf + TEMP_SIZE; 98 zfs_temp_ptr = zfs_temp_buf; 99 dnode_cache_buf = malloc(SPA_MAXBLOCKSIZE); 100 zap_scratch = malloc(SPA_MAXBLOCKSIZE); 101 102 zfs_init_crc(); 103 } 104 105 static void * 106 zfs_alloc(size_t size) 107 { 108 char *ptr; 109 110 if (zfs_temp_ptr + size > zfs_temp_end) { 111 panic("ZFS: out of temporary buffer space"); 112 } 113 ptr = zfs_temp_ptr; 114 zfs_temp_ptr += size; 115 116 return (ptr); 117 } 118 119 static void 120 zfs_free(void *ptr, size_t size) 121 { 122 123 zfs_temp_ptr -= size; 124 if (zfs_temp_ptr != ptr) { 125 panic("ZFS: zfs_alloc()/zfs_free() mismatch"); 126 } 127 } 128 129 static int 130 xdr_int(const unsigned char **xdr, int *ip) 131 { 132 *ip = be32dec(*xdr); 133 (*xdr) += 4; 134 return (0); 135 } 136 137 static int 138 xdr_u_int(const unsigned char **xdr, u_int *ip) 139 { 140 *ip = be32dec(*xdr); 141 (*xdr) += 4; 142 return (0); 143 } 144 145 static int 146 xdr_uint64_t(const unsigned char **xdr, uint64_t *lp) 147 { 148 u_int hi, lo; 149 150 xdr_u_int(xdr, &hi); 151 xdr_u_int(xdr, &lo); 152 *lp = (((uint64_t) hi) << 32) | lo; 153 return (0); 154 } 155 156 static int 157 nvlist_find(const unsigned char *nvlist, const char *name, int type, 158 int* elementsp, void *valuep) 159 { 160 const unsigned char *p, *pair; 161 int junk; 162 int encoded_size, decoded_size; 163 164 p = nvlist; 165 xdr_int(&p, &junk); 166 xdr_int(&p, &junk); 167 168 pair = p; 169 xdr_int(&p, &encoded_size); 170 xdr_int(&p, &decoded_size); 171 while (encoded_size && decoded_size) { 172 int namelen, pairtype, elements; 173 const char *pairname; 174 175 xdr_int(&p, &namelen); 176 pairname = (const char*) p; 177 p += roundup(namelen, 4); 178 xdr_int(&p, &pairtype); 179 180 if (!memcmp(name, pairname, namelen) && type == pairtype) { 181 xdr_int(&p, &elements); 182 if (elementsp) 183 *elementsp = elements; 184 if (type == DATA_TYPE_UINT64) { 185 xdr_uint64_t(&p, (uint64_t *) valuep); 186 return (0); 187 } else if (type == DATA_TYPE_STRING) { 188 int len; 189 xdr_int(&p, &len); 190 (*(const char**) valuep) = (const char*) p; 191 return (0); 192 } else if (type == DATA_TYPE_NVLIST 193 || type == DATA_TYPE_NVLIST_ARRAY) { 194 (*(const unsigned char**) valuep) = 195 (const unsigned char*) p; 196 return (0); 197 } else { 198 return (EIO); 199 } 200 } else { 201 /* 202 * Not the pair we are looking for, skip to the next one. 203 */ 204 p = pair + encoded_size; 205 } 206 207 pair = p; 208 xdr_int(&p, &encoded_size); 209 xdr_int(&p, &decoded_size); 210 } 211 212 return (EIO); 213 } 214 215 static int 216 nvlist_check_features_for_read(const unsigned char *nvlist) 217 { 218 const unsigned char *p, *pair; 219 int junk; 220 int encoded_size, decoded_size; 221 int rc; 222 223 rc = 0; 224 225 p = nvlist; 226 xdr_int(&p, &junk); 227 xdr_int(&p, &junk); 228 229 pair = p; 230 xdr_int(&p, &encoded_size); 231 xdr_int(&p, &decoded_size); 232 while (encoded_size && decoded_size) { 233 int namelen, pairtype; 234 const char *pairname; 235 int i, found; 236 237 found = 0; 238 239 xdr_int(&p, &namelen); 240 pairname = (const char*) p; 241 p += roundup(namelen, 4); 242 xdr_int(&p, &pairtype); 243 244 for (i = 0; features_for_read[i] != NULL; i++) { 245 if (!memcmp(pairname, features_for_read[i], namelen)) { 246 found = 1; 247 break; 248 } 249 } 250 251 if (!found) { 252 printf("ZFS: unsupported feature: %s\n", pairname); 253 rc = EIO; 254 } 255 256 p = pair + encoded_size; 257 258 pair = p; 259 xdr_int(&p, &encoded_size); 260 xdr_int(&p, &decoded_size); 261 } 262 263 return (rc); 264 } 265 266 /* 267 * Return the next nvlist in an nvlist array. 268 */ 269 static const unsigned char * 270 nvlist_next(const unsigned char *nvlist) 271 { 272 const unsigned char *p, *pair; 273 int junk; 274 int encoded_size, decoded_size; 275 276 p = nvlist; 277 xdr_int(&p, &junk); 278 xdr_int(&p, &junk); 279 280 pair = p; 281 xdr_int(&p, &encoded_size); 282 xdr_int(&p, &decoded_size); 283 while (encoded_size && decoded_size) { 284 p = pair + encoded_size; 285 286 pair = p; 287 xdr_int(&p, &encoded_size); 288 xdr_int(&p, &decoded_size); 289 } 290 291 return p; 292 } 293 294 #ifdef TEST 295 296 static const unsigned char * 297 nvlist_print(const unsigned char *nvlist, unsigned int indent) 298 { 299 static const char* typenames[] = { 300 "DATA_TYPE_UNKNOWN", 301 "DATA_TYPE_BOOLEAN", 302 "DATA_TYPE_BYTE", 303 "DATA_TYPE_INT16", 304 "DATA_TYPE_UINT16", 305 "DATA_TYPE_INT32", 306 "DATA_TYPE_UINT32", 307 "DATA_TYPE_INT64", 308 "DATA_TYPE_UINT64", 309 "DATA_TYPE_STRING", 310 "DATA_TYPE_BYTE_ARRAY", 311 "DATA_TYPE_INT16_ARRAY", 312 "DATA_TYPE_UINT16_ARRAY", 313 "DATA_TYPE_INT32_ARRAY", 314 "DATA_TYPE_UINT32_ARRAY", 315 "DATA_TYPE_INT64_ARRAY", 316 "DATA_TYPE_UINT64_ARRAY", 317 "DATA_TYPE_STRING_ARRAY", 318 "DATA_TYPE_HRTIME", 319 "DATA_TYPE_NVLIST", 320 "DATA_TYPE_NVLIST_ARRAY", 321 "DATA_TYPE_BOOLEAN_VALUE", 322 "DATA_TYPE_INT8", 323 "DATA_TYPE_UINT8", 324 "DATA_TYPE_BOOLEAN_ARRAY", 325 "DATA_TYPE_INT8_ARRAY", 326 "DATA_TYPE_UINT8_ARRAY" 327 }; 328 329 unsigned int i, j; 330 const unsigned char *p, *pair; 331 int junk; 332 int encoded_size, decoded_size; 333 334 p = nvlist; 335 xdr_int(&p, &junk); 336 xdr_int(&p, &junk); 337 338 pair = p; 339 xdr_int(&p, &encoded_size); 340 xdr_int(&p, &decoded_size); 341 while (encoded_size && decoded_size) { 342 int namelen, pairtype, elements; 343 const char *pairname; 344 345 xdr_int(&p, &namelen); 346 pairname = (const char*) p; 347 p += roundup(namelen, 4); 348 xdr_int(&p, &pairtype); 349 350 for (i = 0; i < indent; i++) 351 printf(" "); 352 printf("%s %s", typenames[pairtype], pairname); 353 354 xdr_int(&p, &elements); 355 switch (pairtype) { 356 case DATA_TYPE_UINT64: { 357 uint64_t val; 358 xdr_uint64_t(&p, &val); 359 printf(" = 0x%jx\n", (uintmax_t)val); 360 break; 361 } 362 363 case DATA_TYPE_STRING: { 364 int len; 365 xdr_int(&p, &len); 366 printf(" = \"%s\"\n", p); 367 break; 368 } 369 370 case DATA_TYPE_NVLIST: 371 printf("\n"); 372 nvlist_print(p, indent + 1); 373 break; 374 375 case DATA_TYPE_NVLIST_ARRAY: 376 for (j = 0; j < elements; j++) { 377 printf("[%d]\n", j); 378 p = nvlist_print(p, indent + 1); 379 if (j != elements - 1) { 380 for (i = 0; i < indent; i++) 381 printf(" "); 382 printf("%s %s", typenames[pairtype], pairname); 383 } 384 } 385 break; 386 387 default: 388 printf("\n"); 389 } 390 391 p = pair + encoded_size; 392 393 pair = p; 394 xdr_int(&p, &encoded_size); 395 xdr_int(&p, &decoded_size); 396 } 397 398 return p; 399 } 400 401 #endif 402 403 static int 404 vdev_read_phys(vdev_t *vdev, const blkptr_t *bp, void *buf, 405 off_t offset, size_t size) 406 { 407 size_t psize; 408 int rc; 409 410 if (!vdev->v_phys_read) 411 return (EIO); 412 413 if (bp) { 414 psize = BP_GET_PSIZE(bp); 415 } else { 416 psize = size; 417 } 418 419 /*printf("ZFS: reading %zu bytes at 0x%jx to %p\n", psize, (uintmax_t)offset, buf);*/ 420 rc = vdev->v_phys_read(vdev, vdev->v_read_priv, offset, buf, psize); 421 if (rc) 422 return (rc); 423 if (bp && zio_checksum_verify(vdev->spa, bp, buf)) 424 return (EIO); 425 426 return (0); 427 } 428 429 static int 430 vdev_disk_read(vdev_t *vdev, const blkptr_t *bp, void *buf, 431 off_t offset, size_t bytes) 432 { 433 434 return (vdev_read_phys(vdev, bp, buf, 435 offset + VDEV_LABEL_START_SIZE, bytes)); 436 } 437 438 439 static int 440 vdev_mirror_read(vdev_t *vdev, const blkptr_t *bp, void *buf, 441 off_t offset, size_t bytes) 442 { 443 vdev_t *kid; 444 int rc; 445 446 rc = EIO; 447 STAILQ_FOREACH(kid, &vdev->v_children, v_childlink) { 448 if (kid->v_state != VDEV_STATE_HEALTHY) 449 continue; 450 rc = kid->v_read(kid, bp, buf, offset, bytes); 451 if (!rc) 452 return (0); 453 } 454 455 return (rc); 456 } 457 458 static int 459 vdev_replacing_read(vdev_t *vdev, const blkptr_t *bp, void *buf, 460 off_t offset, size_t bytes) 461 { 462 vdev_t *kid; 463 464 /* 465 * Here we should have two kids: 466 * First one which is the one we are replacing and we can trust 467 * only this one to have valid data, but it might not be present. 468 * Second one is that one we are replacing with. It is most likely 469 * healthy, but we can't trust it has needed data, so we won't use it. 470 */ 471 kid = STAILQ_FIRST(&vdev->v_children); 472 if (kid == NULL) 473 return (EIO); 474 if (kid->v_state != VDEV_STATE_HEALTHY) 475 return (EIO); 476 return (kid->v_read(kid, bp, buf, offset, bytes)); 477 } 478 479 static vdev_t * 480 vdev_find(uint64_t guid) 481 { 482 vdev_t *vdev; 483 484 STAILQ_FOREACH(vdev, &zfs_vdevs, v_alllink) 485 if (vdev->v_guid == guid) 486 return (vdev); 487 488 return (0); 489 } 490 491 static vdev_t * 492 vdev_create(uint64_t guid, vdev_read_t *_read) 493 { 494 vdev_t *vdev; 495 496 vdev = malloc(sizeof(vdev_t)); 497 memset(vdev, 0, sizeof(vdev_t)); 498 STAILQ_INIT(&vdev->v_children); 499 vdev->v_guid = guid; 500 vdev->v_state = VDEV_STATE_OFFLINE; 501 vdev->v_read = _read; 502 vdev->v_phys_read = 0; 503 vdev->v_read_priv = 0; 504 STAILQ_INSERT_TAIL(&zfs_vdevs, vdev, v_alllink); 505 506 return (vdev); 507 } 508 509 static int 510 vdev_init_from_nvlist(const unsigned char *nvlist, vdev_t *pvdev, 511 vdev_t **vdevp, int is_newer) 512 { 513 int rc; 514 uint64_t guid, id, ashift, nparity; 515 const char *type; 516 const char *path; 517 vdev_t *vdev, *kid; 518 const unsigned char *kids; 519 int nkids, i, is_new; 520 uint64_t is_offline, is_faulted, is_degraded, is_removed, isnt_present; 521 522 if (nvlist_find(nvlist, ZPOOL_CONFIG_GUID, DATA_TYPE_UINT64, 523 NULL, &guid) 524 || nvlist_find(nvlist, ZPOOL_CONFIG_ID, DATA_TYPE_UINT64, NULL, &id) 525 || nvlist_find(nvlist, ZPOOL_CONFIG_TYPE, DATA_TYPE_STRING, 526 NULL, &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, NULL, 545 &is_offline); 546 nvlist_find(nvlist, ZPOOL_CONFIG_REMOVED, DATA_TYPE_UINT64, NULL, 547 &is_removed); 548 nvlist_find(nvlist, ZPOOL_CONFIG_FAULTED, DATA_TYPE_UINT64, NULL, 549 &is_faulted); 550 nvlist_find(nvlist, ZPOOL_CONFIG_DEGRADED, DATA_TYPE_UINT64, NULL, 551 &is_degraded); 552 nvlist_find(nvlist, ZPOOL_CONFIG_NOT_PRESENT, DATA_TYPE_UINT64, NULL, 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, NULL, &ashift) == 0) { 572 vdev->v_ashift = ashift; 573 } else { 574 vdev->v_ashift = 0; 575 } 576 if (nvlist_find(nvlist, ZPOOL_CONFIG_NPARITY, 577 DATA_TYPE_UINT64, NULL, &nparity) == 0) { 578 vdev->v_nparity = nparity; 579 } else { 580 vdev->v_nparity = 0; 581 } 582 if (nvlist_find(nvlist, ZPOOL_CONFIG_PATH, 583 DATA_TYPE_STRING, NULL, &path) == 0) { 584 if (strncmp(path, "/dev/", 5) == 0) 585 path += 5; 586 vdev->v_name = strdup(path); 587 } else { 588 if (!strcmp(type, "raidz")) { 589 if (vdev->v_nparity == 1) 590 vdev->v_name = "raidz1"; 591 else if (vdev->v_nparity == 2) 592 vdev->v_name = "raidz2"; 593 else if (vdev->v_nparity == 3) 594 vdev->v_name = "raidz3"; 595 else { 596 printf("ZFS: can only boot from disk, mirror, raidz1, raidz2 and raidz3 vdevs\n"); 597 return (EIO); 598 } 599 } else { 600 vdev->v_name = strdup(type); 601 } 602 } 603 } else { 604 is_new = 0; 605 } 606 607 if (is_new || is_newer) { 608 /* 609 * This is either new vdev or we've already seen this vdev, 610 * but from an older vdev label, so let's refresh its state 611 * from the newer label. 612 */ 613 if (is_offline) 614 vdev->v_state = VDEV_STATE_OFFLINE; 615 else if (is_removed) 616 vdev->v_state = VDEV_STATE_REMOVED; 617 else if (is_faulted) 618 vdev->v_state = VDEV_STATE_FAULTED; 619 else if (is_degraded) 620 vdev->v_state = VDEV_STATE_DEGRADED; 621 else if (isnt_present) 622 vdev->v_state = VDEV_STATE_CANT_OPEN; 623 } 624 625 rc = nvlist_find(nvlist, ZPOOL_CONFIG_CHILDREN, DATA_TYPE_NVLIST_ARRAY, 626 &nkids, &kids); 627 /* 628 * Its ok if we don't have any kids. 629 */ 630 if (rc == 0) { 631 vdev->v_nchildren = nkids; 632 for (i = 0; i < nkids; i++) { 633 rc = vdev_init_from_nvlist(kids, vdev, &kid, is_newer); 634 if (rc) 635 return (rc); 636 if (is_new) 637 STAILQ_INSERT_TAIL(&vdev->v_children, kid, 638 v_childlink); 639 kids = nvlist_next(kids); 640 } 641 } else { 642 vdev->v_nchildren = 0; 643 } 644 645 if (vdevp) 646 *vdevp = vdev; 647 return (0); 648 } 649 650 static void 651 vdev_set_state(vdev_t *vdev) 652 { 653 vdev_t *kid; 654 int good_kids; 655 int bad_kids; 656 657 /* 658 * A mirror or raidz is healthy if all its kids are healthy. A 659 * mirror is degraded if any of its kids is healthy; a raidz 660 * is degraded if at most nparity kids are offline. 661 */ 662 if (STAILQ_FIRST(&vdev->v_children)) { 663 good_kids = 0; 664 bad_kids = 0; 665 STAILQ_FOREACH(kid, &vdev->v_children, v_childlink) { 666 if (kid->v_state == VDEV_STATE_HEALTHY) 667 good_kids++; 668 else 669 bad_kids++; 670 } 671 if (bad_kids == 0) { 672 vdev->v_state = VDEV_STATE_HEALTHY; 673 } else { 674 if (vdev->v_read == vdev_mirror_read) { 675 if (good_kids) { 676 vdev->v_state = VDEV_STATE_DEGRADED; 677 } else { 678 vdev->v_state = VDEV_STATE_OFFLINE; 679 } 680 } else if (vdev->v_read == vdev_raidz_read) { 681 if (bad_kids > vdev->v_nparity) { 682 vdev->v_state = VDEV_STATE_OFFLINE; 683 } else { 684 vdev->v_state = VDEV_STATE_DEGRADED; 685 } 686 } 687 } 688 } 689 } 690 691 static spa_t * 692 spa_find_by_guid(uint64_t guid) 693 { 694 spa_t *spa; 695 696 STAILQ_FOREACH(spa, &zfs_pools, spa_link) 697 if (spa->spa_guid == guid) 698 return (spa); 699 700 return (0); 701 } 702 703 static spa_t * 704 spa_find_by_name(const char *name) 705 { 706 spa_t *spa; 707 708 STAILQ_FOREACH(spa, &zfs_pools, spa_link) 709 if (!strcmp(spa->spa_name, name)) 710 return (spa); 711 712 return (0); 713 } 714 715 #ifdef BOOT2 716 static spa_t * 717 spa_get_primary(void) 718 { 719 720 return (STAILQ_FIRST(&zfs_pools)); 721 } 722 723 static vdev_t * 724 spa_get_primary_vdev(const spa_t *spa) 725 { 726 vdev_t *vdev; 727 vdev_t *kid; 728 729 if (spa == NULL) 730 spa = spa_get_primary(); 731 if (spa == NULL) 732 return (NULL); 733 vdev = STAILQ_FIRST(&spa->spa_vdevs); 734 if (vdev == NULL) 735 return (NULL); 736 for (kid = STAILQ_FIRST(&vdev->v_children); kid != NULL; 737 kid = STAILQ_FIRST(&vdev->v_children)) 738 vdev = kid; 739 return (vdev); 740 } 741 #endif 742 743 static spa_t * 744 spa_create(uint64_t guid, const char *name) 745 { 746 spa_t *spa; 747 748 if ((spa = calloc(1, sizeof(spa_t))) == NULL) 749 return (NULL); 750 if ((spa->spa_name = strdup(name)) == NULL) { 751 free(spa); 752 return (NULL); 753 } 754 STAILQ_INIT(&spa->spa_vdevs); 755 spa->spa_guid = guid; 756 STAILQ_INSERT_TAIL(&zfs_pools, spa, spa_link); 757 758 return (spa); 759 } 760 761 static const char * 762 state_name(vdev_state_t state) 763 { 764 static const char* names[] = { 765 "UNKNOWN", 766 "CLOSED", 767 "OFFLINE", 768 "REMOVED", 769 "CANT_OPEN", 770 "FAULTED", 771 "DEGRADED", 772 "ONLINE" 773 }; 774 return names[state]; 775 } 776 777 #ifdef BOOT2 778 779 #define pager_printf printf 780 781 #else 782 783 static int 784 pager_printf(const char *fmt, ...) 785 { 786 char line[80]; 787 va_list args; 788 789 va_start(args, fmt); 790 vsprintf(line, fmt, args); 791 va_end(args); 792 793 return (pager_output(line)); 794 } 795 796 #endif 797 798 #define STATUS_FORMAT " %s %s\n" 799 800 static int 801 print_state(int indent, const char *name, vdev_state_t state) 802 { 803 char buf[512]; 804 int i; 805 806 buf[0] = 0; 807 for (i = 0; i < indent; i++) 808 strcat(buf, " "); 809 strcat(buf, name); 810 811 return (pager_printf(STATUS_FORMAT, buf, state_name(state))); 812 } 813 814 static int 815 vdev_status(vdev_t *vdev, int indent) 816 { 817 vdev_t *kid; 818 int ret; 819 ret = print_state(indent, vdev->v_name, vdev->v_state); 820 if (ret != 0) 821 return (ret); 822 823 STAILQ_FOREACH(kid, &vdev->v_children, v_childlink) { 824 ret = vdev_status(kid, indent + 1); 825 if (ret != 0) 826 return (ret); 827 } 828 return (ret); 829 } 830 831 static int 832 spa_status(spa_t *spa) 833 { 834 static char bootfs[ZFS_MAXNAMELEN]; 835 uint64_t rootid; 836 vdev_t *vdev; 837 int good_kids, bad_kids, degraded_kids, ret; 838 vdev_state_t state; 839 840 ret = pager_printf(" pool: %s\n", spa->spa_name); 841 if (ret != 0) 842 return (ret); 843 844 if (zfs_get_root(spa, &rootid) == 0 && 845 zfs_rlookup(spa, rootid, bootfs) == 0) { 846 if (bootfs[0] == '\0') 847 ret = pager_printf("bootfs: %s\n", spa->spa_name); 848 else 849 ret = pager_printf("bootfs: %s/%s\n", spa->spa_name, 850 bootfs); 851 if (ret != 0) 852 return (ret); 853 } 854 ret = pager_printf("config:\n\n"); 855 if (ret != 0) 856 return (ret); 857 ret = pager_printf(STATUS_FORMAT, "NAME", "STATE"); 858 if (ret != 0) 859 return (ret); 860 861 good_kids = 0; 862 degraded_kids = 0; 863 bad_kids = 0; 864 STAILQ_FOREACH(vdev, &spa->spa_vdevs, v_childlink) { 865 if (vdev->v_state == VDEV_STATE_HEALTHY) 866 good_kids++; 867 else if (vdev->v_state == VDEV_STATE_DEGRADED) 868 degraded_kids++; 869 else 870 bad_kids++; 871 } 872 873 state = VDEV_STATE_CLOSED; 874 if (good_kids > 0 && (degraded_kids + bad_kids) == 0) 875 state = VDEV_STATE_HEALTHY; 876 else if ((good_kids + degraded_kids) > 0) 877 state = VDEV_STATE_DEGRADED; 878 879 ret = print_state(0, spa->spa_name, state); 880 if (ret != 0) 881 return (ret); 882 STAILQ_FOREACH(vdev, &spa->spa_vdevs, v_childlink) { 883 ret = vdev_status(vdev, 1); 884 if (ret != 0) 885 return (ret); 886 } 887 return (ret); 888 } 889 890 static int 891 spa_all_status(void) 892 { 893 spa_t *spa; 894 int first = 1, ret = 0; 895 896 STAILQ_FOREACH(spa, &zfs_pools, spa_link) { 897 if (!first) { 898 ret = pager_printf("\n"); 899 if (ret != 0) 900 return (ret); 901 } 902 first = 0; 903 ret = spa_status(spa); 904 if (ret != 0) 905 return (ret); 906 } 907 return (ret); 908 } 909 910 static uint64_t 911 vdev_label_offset(uint64_t psize, int l, uint64_t offset) 912 { 913 uint64_t label_offset; 914 915 if (l < VDEV_LABELS / 2) 916 label_offset = 0; 917 else 918 label_offset = psize - VDEV_LABELS * sizeof (vdev_label_t); 919 920 return (offset + l * sizeof (vdev_label_t) + label_offset); 921 } 922 923 static int 924 vdev_probe(vdev_phys_read_t *_read, void *read_priv, spa_t **spap) 925 { 926 vdev_t vtmp; 927 vdev_phys_t *vdev_label = (vdev_phys_t *) zap_scratch; 928 vdev_phys_t *tmp_label; 929 spa_t *spa; 930 vdev_t *vdev, *top_vdev, *pool_vdev; 931 off_t off; 932 blkptr_t bp; 933 const unsigned char *nvlist = NULL; 934 uint64_t val; 935 uint64_t guid; 936 uint64_t best_txg = 0; 937 uint64_t pool_txg, pool_guid; 938 uint64_t psize; 939 const char *pool_name; 940 const unsigned char *vdevs; 941 const unsigned char *features; 942 int i, l, rc, is_newer; 943 char *upbuf; 944 const struct uberblock *up; 945 946 /* 947 * Load the vdev label and figure out which 948 * uberblock is most current. 949 */ 950 memset(&vtmp, 0, sizeof(vtmp)); 951 vtmp.v_phys_read = _read; 952 vtmp.v_read_priv = read_priv; 953 psize = P2ALIGN(ldi_get_size(read_priv), 954 (uint64_t)sizeof (vdev_label_t)); 955 956 /* Test for minimum pool size. */ 957 if (psize < SPA_MINDEVSIZE) 958 return (EIO); 959 960 tmp_label = zfs_alloc(sizeof(vdev_phys_t)); 961 962 for (l = 0; l < VDEV_LABELS; l++) { 963 off = vdev_label_offset(psize, l, 964 offsetof(vdev_label_t, vl_vdev_phys)); 965 966 BP_ZERO(&bp); 967 BP_SET_LSIZE(&bp, sizeof(vdev_phys_t)); 968 BP_SET_PSIZE(&bp, sizeof(vdev_phys_t)); 969 BP_SET_CHECKSUM(&bp, ZIO_CHECKSUM_LABEL); 970 BP_SET_COMPRESS(&bp, ZIO_COMPRESS_OFF); 971 DVA_SET_OFFSET(BP_IDENTITY(&bp), off); 972 ZIO_SET_CHECKSUM(&bp.blk_cksum, off, 0, 0, 0); 973 974 if (vdev_read_phys(&vtmp, &bp, tmp_label, off, 0)) 975 continue; 976 977 if (tmp_label->vp_nvlist[0] != NV_ENCODE_XDR) 978 continue; 979 980 nvlist = (const unsigned char *) tmp_label->vp_nvlist + 4; 981 if (nvlist_find(nvlist, ZPOOL_CONFIG_POOL_TXG, 982 DATA_TYPE_UINT64, NULL, &pool_txg) != 0) 983 continue; 984 985 if (best_txg <= pool_txg) { 986 best_txg = pool_txg; 987 memcpy(vdev_label, tmp_label, sizeof (vdev_phys_t)); 988 } 989 } 990 991 zfs_free(tmp_label, sizeof (vdev_phys_t)); 992 993 if (best_txg == 0) 994 return (EIO); 995 996 if (vdev_label->vp_nvlist[0] != NV_ENCODE_XDR) 997 return (EIO); 998 999 nvlist = (const unsigned char *) vdev_label->vp_nvlist + 4; 1000 1001 if (nvlist_find(nvlist, ZPOOL_CONFIG_VERSION, DATA_TYPE_UINT64, 1002 NULL, &val) != 0) { 1003 return (EIO); 1004 } 1005 1006 if (!SPA_VERSION_IS_SUPPORTED(val)) { 1007 printf("ZFS: unsupported ZFS version %u (should be %u)\n", 1008 (unsigned) val, (unsigned) SPA_VERSION); 1009 return (EIO); 1010 } 1011 1012 /* Check ZFS features for read */ 1013 if (nvlist_find(nvlist, ZPOOL_CONFIG_FEATURES_FOR_READ, 1014 DATA_TYPE_NVLIST, NULL, &features) == 0 && 1015 nvlist_check_features_for_read(features) != 0) { 1016 return (EIO); 1017 } 1018 1019 if (nvlist_find(nvlist, ZPOOL_CONFIG_POOL_STATE, DATA_TYPE_UINT64, 1020 NULL, &val) != 0) { 1021 return (EIO); 1022 } 1023 1024 if (val == POOL_STATE_DESTROYED) { 1025 /* We don't boot only from destroyed pools. */ 1026 return (EIO); 1027 } 1028 1029 if (nvlist_find(nvlist, ZPOOL_CONFIG_POOL_TXG, DATA_TYPE_UINT64, 1030 NULL, &pool_txg) != 0 || 1031 nvlist_find(nvlist, ZPOOL_CONFIG_POOL_GUID, DATA_TYPE_UINT64, 1032 NULL, &pool_guid) != 0 || 1033 nvlist_find(nvlist, ZPOOL_CONFIG_POOL_NAME, DATA_TYPE_STRING, 1034 NULL, &pool_name) != 0) { 1035 /* 1036 * Cache and spare devices end up here - just ignore 1037 * them. 1038 */ 1039 /*printf("ZFS: can't find pool details\n");*/ 1040 return (EIO); 1041 } 1042 1043 if (nvlist_find(nvlist, ZPOOL_CONFIG_IS_LOG, DATA_TYPE_UINT64, 1044 NULL, &val) == 0 && val != 0) { 1045 return (EIO); 1046 } 1047 1048 /* 1049 * Create the pool if this is the first time we've seen it. 1050 */ 1051 spa = spa_find_by_guid(pool_guid); 1052 if (spa == NULL) { 1053 spa = spa_create(pool_guid, pool_name); 1054 if (spa == NULL) 1055 return (ENOMEM); 1056 } 1057 if (pool_txg > spa->spa_txg) { 1058 spa->spa_txg = pool_txg; 1059 is_newer = 1; 1060 } else { 1061 is_newer = 0; 1062 } 1063 1064 /* 1065 * Get the vdev tree and create our in-core copy of it. 1066 * If we already have a vdev with this guid, this must 1067 * be some kind of alias (overlapping slices, dangerously dedicated 1068 * disks etc). 1069 */ 1070 if (nvlist_find(nvlist, ZPOOL_CONFIG_GUID, DATA_TYPE_UINT64, 1071 NULL, &guid) != 0) { 1072 return (EIO); 1073 } 1074 vdev = vdev_find(guid); 1075 if (vdev && vdev->v_phys_read) /* Has this vdev already been inited? */ 1076 return (EIO); 1077 1078 if (nvlist_find(nvlist, ZPOOL_CONFIG_VDEV_TREE, DATA_TYPE_NVLIST, 1079 NULL, &vdevs)) { 1080 return (EIO); 1081 } 1082 1083 rc = vdev_init_from_nvlist(vdevs, NULL, &top_vdev, is_newer); 1084 if (rc != 0) 1085 return (rc); 1086 1087 /* 1088 * Add the toplevel vdev to the pool if its not already there. 1089 */ 1090 STAILQ_FOREACH(pool_vdev, &spa->spa_vdevs, v_childlink) 1091 if (top_vdev == pool_vdev) 1092 break; 1093 if (!pool_vdev && top_vdev) { 1094 top_vdev->spa = spa; 1095 STAILQ_INSERT_TAIL(&spa->spa_vdevs, top_vdev, v_childlink); 1096 } 1097 1098 /* 1099 * We should already have created an incomplete vdev for this 1100 * vdev. Find it and initialise it with our read proc. 1101 */ 1102 vdev = vdev_find(guid); 1103 if (vdev) { 1104 vdev->v_phys_read = _read; 1105 vdev->v_read_priv = read_priv; 1106 vdev->v_state = VDEV_STATE_HEALTHY; 1107 } else { 1108 printf("ZFS: inconsistent nvlist contents\n"); 1109 return (EIO); 1110 } 1111 1112 /* 1113 * Re-evaluate top-level vdev state. 1114 */ 1115 vdev_set_state(top_vdev); 1116 1117 /* 1118 * Ok, we are happy with the pool so far. Lets find 1119 * the best uberblock and then we can actually access 1120 * the contents of the pool. 1121 */ 1122 upbuf = zfs_alloc(VDEV_UBERBLOCK_SIZE(vdev)); 1123 up = (const struct uberblock *)upbuf; 1124 for (l = 0; l < VDEV_LABELS; l++) { 1125 for (i = 0; i < VDEV_UBERBLOCK_COUNT(vdev); i++) { 1126 off = vdev_label_offset(psize, l, 1127 VDEV_UBERBLOCK_OFFSET(vdev, i)); 1128 BP_ZERO(&bp); 1129 DVA_SET_OFFSET(&bp.blk_dva[0], off); 1130 BP_SET_LSIZE(&bp, VDEV_UBERBLOCK_SIZE(vdev)); 1131 BP_SET_PSIZE(&bp, VDEV_UBERBLOCK_SIZE(vdev)); 1132 BP_SET_CHECKSUM(&bp, ZIO_CHECKSUM_LABEL); 1133 BP_SET_COMPRESS(&bp, ZIO_COMPRESS_OFF); 1134 ZIO_SET_CHECKSUM(&bp.blk_cksum, off, 0, 0, 0); 1135 1136 if (vdev_read_phys(vdev, &bp, upbuf, off, 0)) 1137 continue; 1138 1139 if (up->ub_magic != UBERBLOCK_MAGIC) 1140 continue; 1141 if (up->ub_txg < spa->spa_txg) 1142 continue; 1143 if (up->ub_txg > spa->spa_uberblock.ub_txg || 1144 (up->ub_txg == spa->spa_uberblock.ub_txg && 1145 up->ub_timestamp > 1146 spa->spa_uberblock.ub_timestamp)) { 1147 spa->spa_uberblock = *up; 1148 } 1149 } 1150 } 1151 zfs_free(upbuf, VDEV_UBERBLOCK_SIZE(vdev)); 1152 1153 vdev->spa = spa; 1154 if (spap != NULL) 1155 *spap = spa; 1156 return (0); 1157 } 1158 1159 static int 1160 ilog2(int n) 1161 { 1162 int v; 1163 1164 for (v = 0; v < 32; v++) 1165 if (n == (1 << v)) 1166 return v; 1167 return -1; 1168 } 1169 1170 static int 1171 zio_read_gang(const spa_t *spa, const blkptr_t *bp, void *buf) 1172 { 1173 blkptr_t gbh_bp; 1174 zio_gbh_phys_t zio_gb; 1175 char *pbuf; 1176 int i; 1177 1178 /* Artificial BP for gang block header. */ 1179 gbh_bp = *bp; 1180 BP_SET_PSIZE(&gbh_bp, SPA_GANGBLOCKSIZE); 1181 BP_SET_LSIZE(&gbh_bp, SPA_GANGBLOCKSIZE); 1182 BP_SET_CHECKSUM(&gbh_bp, ZIO_CHECKSUM_GANG_HEADER); 1183 BP_SET_COMPRESS(&gbh_bp, ZIO_COMPRESS_OFF); 1184 for (i = 0; i < SPA_DVAS_PER_BP; i++) 1185 DVA_SET_GANG(&gbh_bp.blk_dva[i], 0); 1186 1187 /* Read gang header block using the artificial BP. */ 1188 if (zio_read(spa, &gbh_bp, &zio_gb)) 1189 return (EIO); 1190 1191 pbuf = buf; 1192 for (i = 0; i < SPA_GBH_NBLKPTRS; i++) { 1193 blkptr_t *gbp = &zio_gb.zg_blkptr[i]; 1194 1195 if (BP_IS_HOLE(gbp)) 1196 continue; 1197 if (zio_read(spa, gbp, pbuf)) 1198 return (EIO); 1199 pbuf += BP_GET_PSIZE(gbp); 1200 } 1201 1202 if (zio_checksum_verify(spa, bp, buf)) 1203 return (EIO); 1204 return (0); 1205 } 1206 1207 static int 1208 zio_read(const spa_t *spa, const blkptr_t *bp, void *buf) 1209 { 1210 int cpfunc = BP_GET_COMPRESS(bp); 1211 uint64_t align, size; 1212 void *pbuf; 1213 int i, error; 1214 1215 /* 1216 * Process data embedded in block pointer 1217 */ 1218 if (BP_IS_EMBEDDED(bp)) { 1219 ASSERT(BPE_GET_ETYPE(bp) == BP_EMBEDDED_TYPE_DATA); 1220 1221 size = BPE_GET_PSIZE(bp); 1222 ASSERT(size <= BPE_PAYLOAD_SIZE); 1223 1224 if (cpfunc != ZIO_COMPRESS_OFF) 1225 pbuf = zfs_alloc(size); 1226 else 1227 pbuf = buf; 1228 1229 decode_embedded_bp_compressed(bp, pbuf); 1230 error = 0; 1231 1232 if (cpfunc != ZIO_COMPRESS_OFF) { 1233 error = zio_decompress_data(cpfunc, pbuf, 1234 size, buf, BP_GET_LSIZE(bp)); 1235 zfs_free(pbuf, size); 1236 } 1237 if (error != 0) 1238 printf("ZFS: i/o error - unable to decompress block pointer data, error %d\n", 1239 error); 1240 return (error); 1241 } 1242 1243 error = EIO; 1244 1245 for (i = 0; i < SPA_DVAS_PER_BP; i++) { 1246 const dva_t *dva = &bp->blk_dva[i]; 1247 vdev_t *vdev; 1248 int vdevid; 1249 off_t offset; 1250 1251 if (!dva->dva_word[0] && !dva->dva_word[1]) 1252 continue; 1253 1254 vdevid = DVA_GET_VDEV(dva); 1255 offset = DVA_GET_OFFSET(dva); 1256 STAILQ_FOREACH(vdev, &spa->spa_vdevs, v_childlink) { 1257 if (vdev->v_id == vdevid) 1258 break; 1259 } 1260 if (!vdev || !vdev->v_read) 1261 continue; 1262 1263 size = BP_GET_PSIZE(bp); 1264 if (vdev->v_read == vdev_raidz_read) { 1265 align = 1ULL << vdev->v_top->v_ashift; 1266 if (P2PHASE(size, align) != 0) 1267 size = P2ROUNDUP(size, align); 1268 } 1269 if (size != BP_GET_PSIZE(bp) || cpfunc != ZIO_COMPRESS_OFF) 1270 pbuf = zfs_alloc(size); 1271 else 1272 pbuf = buf; 1273 1274 if (DVA_GET_GANG(dva)) 1275 error = zio_read_gang(spa, bp, pbuf); 1276 else 1277 error = vdev->v_read(vdev, bp, pbuf, offset, size); 1278 if (error == 0) { 1279 if (cpfunc != ZIO_COMPRESS_OFF) 1280 error = zio_decompress_data(cpfunc, pbuf, 1281 BP_GET_PSIZE(bp), buf, BP_GET_LSIZE(bp)); 1282 else if (size != BP_GET_PSIZE(bp)) 1283 bcopy(pbuf, buf, BP_GET_PSIZE(bp)); 1284 } 1285 if (buf != pbuf) 1286 zfs_free(pbuf, size); 1287 if (error == 0) 1288 break; 1289 } 1290 if (error != 0) 1291 printf("ZFS: i/o error - all block copies unavailable\n"); 1292 return (error); 1293 } 1294 1295 static int 1296 dnode_read(const spa_t *spa, const dnode_phys_t *dnode, off_t offset, void *buf, size_t buflen) 1297 { 1298 int ibshift = dnode->dn_indblkshift - SPA_BLKPTRSHIFT; 1299 int bsize = dnode->dn_datablkszsec << SPA_MINBLOCKSHIFT; 1300 int nlevels = dnode->dn_nlevels; 1301 int i, rc; 1302 1303 if (bsize > SPA_MAXBLOCKSIZE) { 1304 printf("ZFS: I/O error - blocks larger than %llu are not " 1305 "supported\n", SPA_MAXBLOCKSIZE); 1306 return (EIO); 1307 } 1308 1309 /* 1310 * Note: bsize may not be a power of two here so we need to do an 1311 * actual divide rather than a bitshift. 1312 */ 1313 while (buflen > 0) { 1314 uint64_t bn = offset / bsize; 1315 int boff = offset % bsize; 1316 int ibn; 1317 const blkptr_t *indbp; 1318 blkptr_t bp; 1319 1320 if (bn > dnode->dn_maxblkid) 1321 return (EIO); 1322 1323 if (dnode == dnode_cache_obj && bn == dnode_cache_bn) 1324 goto cached; 1325 1326 indbp = dnode->dn_blkptr; 1327 for (i = 0; i < nlevels; i++) { 1328 /* 1329 * Copy the bp from the indirect array so that 1330 * we can re-use the scratch buffer for multi-level 1331 * objects. 1332 */ 1333 ibn = bn >> ((nlevels - i - 1) * ibshift); 1334 ibn &= ((1 << ibshift) - 1); 1335 bp = indbp[ibn]; 1336 if (BP_IS_HOLE(&bp)) { 1337 memset(dnode_cache_buf, 0, bsize); 1338 break; 1339 } 1340 rc = zio_read(spa, &bp, dnode_cache_buf); 1341 if (rc) 1342 return (rc); 1343 indbp = (const blkptr_t *) dnode_cache_buf; 1344 } 1345 dnode_cache_obj = dnode; 1346 dnode_cache_bn = bn; 1347 cached: 1348 1349 /* 1350 * The buffer contains our data block. Copy what we 1351 * need from it and loop. 1352 */ 1353 i = bsize - boff; 1354 if (i > buflen) i = buflen; 1355 memcpy(buf, &dnode_cache_buf[boff], i); 1356 buf = ((char*) buf) + i; 1357 offset += i; 1358 buflen -= i; 1359 } 1360 1361 return (0); 1362 } 1363 1364 /* 1365 * Lookup a value in a microzap directory. Assumes that the zap 1366 * scratch buffer contains the directory contents. 1367 */ 1368 static int 1369 mzap_lookup(const dnode_phys_t *dnode, const char *name, uint64_t *value) 1370 { 1371 const mzap_phys_t *mz; 1372 const mzap_ent_phys_t *mze; 1373 size_t size; 1374 int chunks, i; 1375 1376 /* 1377 * Microzap objects use exactly one block. Read the whole 1378 * thing. 1379 */ 1380 size = dnode->dn_datablkszsec * 512; 1381 1382 mz = (const mzap_phys_t *) zap_scratch; 1383 chunks = size / MZAP_ENT_LEN - 1; 1384 1385 for (i = 0; i < chunks; i++) { 1386 mze = &mz->mz_chunk[i]; 1387 if (!strcmp(mze->mze_name, name)) { 1388 *value = mze->mze_value; 1389 return (0); 1390 } 1391 } 1392 1393 return (ENOENT); 1394 } 1395 1396 /* 1397 * Compare a name with a zap leaf entry. Return non-zero if the name 1398 * matches. 1399 */ 1400 static int 1401 fzap_name_equal(const zap_leaf_t *zl, const zap_leaf_chunk_t *zc, const char *name) 1402 { 1403 size_t namelen; 1404 const zap_leaf_chunk_t *nc; 1405 const char *p; 1406 1407 namelen = zc->l_entry.le_name_numints; 1408 1409 nc = &ZAP_LEAF_CHUNK(zl, zc->l_entry.le_name_chunk); 1410 p = name; 1411 while (namelen > 0) { 1412 size_t len; 1413 len = namelen; 1414 if (len > ZAP_LEAF_ARRAY_BYTES) 1415 len = ZAP_LEAF_ARRAY_BYTES; 1416 if (memcmp(p, nc->l_array.la_array, len)) 1417 return (0); 1418 p += len; 1419 namelen -= len; 1420 nc = &ZAP_LEAF_CHUNK(zl, nc->l_array.la_next); 1421 } 1422 1423 return 1; 1424 } 1425 1426 /* 1427 * Extract a uint64_t value from a zap leaf entry. 1428 */ 1429 static uint64_t 1430 fzap_leaf_value(const zap_leaf_t *zl, const zap_leaf_chunk_t *zc) 1431 { 1432 const zap_leaf_chunk_t *vc; 1433 int i; 1434 uint64_t value; 1435 const uint8_t *p; 1436 1437 vc = &ZAP_LEAF_CHUNK(zl, zc->l_entry.le_value_chunk); 1438 for (i = 0, value = 0, p = vc->l_array.la_array; i < 8; i++) { 1439 value = (value << 8) | p[i]; 1440 } 1441 1442 return value; 1443 } 1444 1445 static void 1446 stv(int len, void *addr, uint64_t value) 1447 { 1448 switch (len) { 1449 case 1: 1450 *(uint8_t *)addr = value; 1451 return; 1452 case 2: 1453 *(uint16_t *)addr = value; 1454 return; 1455 case 4: 1456 *(uint32_t *)addr = value; 1457 return; 1458 case 8: 1459 *(uint64_t *)addr = value; 1460 return; 1461 } 1462 } 1463 1464 /* 1465 * Extract a array from a zap leaf entry. 1466 */ 1467 static void 1468 fzap_leaf_array(const zap_leaf_t *zl, const zap_leaf_chunk_t *zc, 1469 uint64_t integer_size, uint64_t num_integers, void *buf) 1470 { 1471 uint64_t array_int_len = zc->l_entry.le_value_intlen; 1472 uint64_t value = 0; 1473 uint64_t *u64 = buf; 1474 char *p = buf; 1475 int len = MIN(zc->l_entry.le_value_numints, num_integers); 1476 int chunk = zc->l_entry.le_value_chunk; 1477 int byten = 0; 1478 1479 if (integer_size == 8 && len == 1) { 1480 *u64 = fzap_leaf_value(zl, zc); 1481 return; 1482 } 1483 1484 while (len > 0) { 1485 struct zap_leaf_array *la = &ZAP_LEAF_CHUNK(zl, chunk).l_array; 1486 int i; 1487 1488 ASSERT3U(chunk, <, ZAP_LEAF_NUMCHUNKS(zl)); 1489 for (i = 0; i < ZAP_LEAF_ARRAY_BYTES && len > 0; i++) { 1490 value = (value << 8) | la->la_array[i]; 1491 byten++; 1492 if (byten == array_int_len) { 1493 stv(integer_size, p, value); 1494 byten = 0; 1495 len--; 1496 if (len == 0) 1497 return; 1498 p += integer_size; 1499 } 1500 } 1501 chunk = la->la_next; 1502 } 1503 } 1504 1505 /* 1506 * Lookup a value in a fatzap directory. Assumes that the zap scratch 1507 * buffer contains the directory header. 1508 */ 1509 static int 1510 fzap_lookup(const spa_t *spa, const dnode_phys_t *dnode, const char *name, 1511 uint64_t integer_size, uint64_t num_integers, void *value) 1512 { 1513 int bsize = dnode->dn_datablkszsec << SPA_MINBLOCKSHIFT; 1514 zap_phys_t zh = *(zap_phys_t *) zap_scratch; 1515 fat_zap_t z; 1516 uint64_t *ptrtbl; 1517 uint64_t hash; 1518 int rc; 1519 1520 if (zh.zap_magic != ZAP_MAGIC) 1521 return (EIO); 1522 1523 z.zap_block_shift = ilog2(bsize); 1524 z.zap_phys = (zap_phys_t *) zap_scratch; 1525 1526 /* 1527 * Figure out where the pointer table is and read it in if necessary. 1528 */ 1529 if (zh.zap_ptrtbl.zt_blk) { 1530 rc = dnode_read(spa, dnode, zh.zap_ptrtbl.zt_blk * bsize, 1531 zap_scratch, bsize); 1532 if (rc) 1533 return (rc); 1534 ptrtbl = (uint64_t *) zap_scratch; 1535 } else { 1536 ptrtbl = &ZAP_EMBEDDED_PTRTBL_ENT(&z, 0); 1537 } 1538 1539 hash = zap_hash(zh.zap_salt, name); 1540 1541 zap_leaf_t zl; 1542 zl.l_bs = z.zap_block_shift; 1543 1544 off_t off = ptrtbl[hash >> (64 - zh.zap_ptrtbl.zt_shift)] << zl.l_bs; 1545 zap_leaf_chunk_t *zc; 1546 1547 rc = dnode_read(spa, dnode, off, zap_scratch, bsize); 1548 if (rc) 1549 return (rc); 1550 1551 zl.l_phys = (zap_leaf_phys_t *) zap_scratch; 1552 1553 /* 1554 * Make sure this chunk matches our hash. 1555 */ 1556 if (zl.l_phys->l_hdr.lh_prefix_len > 0 1557 && zl.l_phys->l_hdr.lh_prefix 1558 != hash >> (64 - zl.l_phys->l_hdr.lh_prefix_len)) 1559 return (ENOENT); 1560 1561 /* 1562 * Hash within the chunk to find our entry. 1563 */ 1564 int shift = (64 - ZAP_LEAF_HASH_SHIFT(&zl) - zl.l_phys->l_hdr.lh_prefix_len); 1565 int h = (hash >> shift) & ((1 << ZAP_LEAF_HASH_SHIFT(&zl)) - 1); 1566 h = zl.l_phys->l_hash[h]; 1567 if (h == 0xffff) 1568 return (ENOENT); 1569 zc = &ZAP_LEAF_CHUNK(&zl, h); 1570 while (zc->l_entry.le_hash != hash) { 1571 if (zc->l_entry.le_next == 0xffff) { 1572 zc = NULL; 1573 break; 1574 } 1575 zc = &ZAP_LEAF_CHUNK(&zl, zc->l_entry.le_next); 1576 } 1577 if (fzap_name_equal(&zl, zc, name)) { 1578 if (zc->l_entry.le_value_intlen * zc->l_entry.le_value_numints > 1579 integer_size * num_integers) 1580 return (E2BIG); 1581 fzap_leaf_array(&zl, zc, integer_size, num_integers, value); 1582 return (0); 1583 } 1584 1585 return (ENOENT); 1586 } 1587 1588 /* 1589 * Lookup a name in a zap object and return its value as a uint64_t. 1590 */ 1591 static int 1592 zap_lookup(const spa_t *spa, const dnode_phys_t *dnode, const char *name, 1593 uint64_t integer_size, uint64_t num_integers, void *value) 1594 { 1595 int rc; 1596 uint64_t zap_type; 1597 size_t size = dnode->dn_datablkszsec << SPA_MINBLOCKSHIFT; 1598 1599 rc = dnode_read(spa, dnode, 0, zap_scratch, size); 1600 if (rc) 1601 return (rc); 1602 1603 zap_type = *(uint64_t *) zap_scratch; 1604 if (zap_type == ZBT_MICRO) 1605 return mzap_lookup(dnode, name, value); 1606 else if (zap_type == ZBT_HEADER) { 1607 return fzap_lookup(spa, dnode, name, integer_size, 1608 num_integers, value); 1609 } 1610 printf("ZFS: invalid zap_type=%d\n", (int)zap_type); 1611 return (EIO); 1612 } 1613 1614 /* 1615 * List a microzap directory. Assumes that the zap scratch buffer contains 1616 * the directory contents. 1617 */ 1618 static int 1619 mzap_list(const dnode_phys_t *dnode, int (*callback)(const char *, uint64_t)) 1620 { 1621 const mzap_phys_t *mz; 1622 const mzap_ent_phys_t *mze; 1623 size_t size; 1624 int chunks, i, rc; 1625 1626 /* 1627 * Microzap objects use exactly one block. Read the whole 1628 * thing. 1629 */ 1630 size = dnode->dn_datablkszsec * 512; 1631 mz = (const mzap_phys_t *) zap_scratch; 1632 chunks = size / MZAP_ENT_LEN - 1; 1633 1634 for (i = 0; i < chunks; i++) { 1635 mze = &mz->mz_chunk[i]; 1636 if (mze->mze_name[0]) { 1637 rc = callback(mze->mze_name, mze->mze_value); 1638 if (rc != 0) 1639 return (rc); 1640 } 1641 } 1642 1643 return (0); 1644 } 1645 1646 /* 1647 * List a fatzap directory. Assumes that the zap scratch buffer contains 1648 * the directory header. 1649 */ 1650 static int 1651 fzap_list(const spa_t *spa, const dnode_phys_t *dnode, int (*callback)(const char *, uint64_t)) 1652 { 1653 int bsize = dnode->dn_datablkszsec << SPA_MINBLOCKSHIFT; 1654 zap_phys_t zh = *(zap_phys_t *) zap_scratch; 1655 fat_zap_t z; 1656 int i, j, rc; 1657 1658 if (zh.zap_magic != ZAP_MAGIC) 1659 return (EIO); 1660 1661 z.zap_block_shift = ilog2(bsize); 1662 z.zap_phys = (zap_phys_t *) zap_scratch; 1663 1664 /* 1665 * This assumes that the leaf blocks start at block 1. The 1666 * documentation isn't exactly clear on this. 1667 */ 1668 zap_leaf_t zl; 1669 zl.l_bs = z.zap_block_shift; 1670 for (i = 0; i < zh.zap_num_leafs; i++) { 1671 off_t off = (i + 1) << zl.l_bs; 1672 char name[256], *p; 1673 uint64_t value; 1674 1675 if (dnode_read(spa, dnode, off, zap_scratch, bsize)) 1676 return (EIO); 1677 1678 zl.l_phys = (zap_leaf_phys_t *) zap_scratch; 1679 1680 for (j = 0; j < ZAP_LEAF_NUMCHUNKS(&zl); j++) { 1681 zap_leaf_chunk_t *zc, *nc; 1682 int namelen; 1683 1684 zc = &ZAP_LEAF_CHUNK(&zl, j); 1685 if (zc->l_entry.le_type != ZAP_CHUNK_ENTRY) 1686 continue; 1687 namelen = zc->l_entry.le_name_numints; 1688 if (namelen > sizeof(name)) 1689 namelen = sizeof(name); 1690 1691 /* 1692 * Paste the name back together. 1693 */ 1694 nc = &ZAP_LEAF_CHUNK(&zl, zc->l_entry.le_name_chunk); 1695 p = name; 1696 while (namelen > 0) { 1697 int len; 1698 len = namelen; 1699 if (len > ZAP_LEAF_ARRAY_BYTES) 1700 len = ZAP_LEAF_ARRAY_BYTES; 1701 memcpy(p, nc->l_array.la_array, len); 1702 p += len; 1703 namelen -= len; 1704 nc = &ZAP_LEAF_CHUNK(&zl, nc->l_array.la_next); 1705 } 1706 1707 /* 1708 * Assume the first eight bytes of the value are 1709 * a uint64_t. 1710 */ 1711 value = fzap_leaf_value(&zl, zc); 1712 1713 //printf("%s 0x%jx\n", name, (uintmax_t)value); 1714 rc = callback((const char *)name, value); 1715 if (rc != 0) 1716 return (rc); 1717 } 1718 } 1719 1720 return (0); 1721 } 1722 1723 static int zfs_printf(const char *name, uint64_t value __unused) 1724 { 1725 1726 printf("%s\n", name); 1727 1728 return (0); 1729 } 1730 1731 /* 1732 * List a zap directory. 1733 */ 1734 static int 1735 zap_list(const spa_t *spa, const dnode_phys_t *dnode) 1736 { 1737 uint64_t zap_type; 1738 size_t size = dnode->dn_datablkszsec * 512; 1739 1740 if (dnode_read(spa, dnode, 0, zap_scratch, size)) 1741 return (EIO); 1742 1743 zap_type = *(uint64_t *) zap_scratch; 1744 if (zap_type == ZBT_MICRO) 1745 return mzap_list(dnode, zfs_printf); 1746 else 1747 return fzap_list(spa, dnode, zfs_printf); 1748 } 1749 1750 static int 1751 objset_get_dnode(const spa_t *spa, const objset_phys_t *os, uint64_t objnum, dnode_phys_t *dnode) 1752 { 1753 off_t offset; 1754 1755 offset = objnum * sizeof(dnode_phys_t); 1756 return dnode_read(spa, &os->os_meta_dnode, offset, 1757 dnode, sizeof(dnode_phys_t)); 1758 } 1759 1760 static int 1761 mzap_rlookup(const spa_t *spa, const dnode_phys_t *dnode, char *name, uint64_t value) 1762 { 1763 const mzap_phys_t *mz; 1764 const mzap_ent_phys_t *mze; 1765 size_t size; 1766 int chunks, i; 1767 1768 /* 1769 * Microzap objects use exactly one block. Read the whole 1770 * thing. 1771 */ 1772 size = dnode->dn_datablkszsec * 512; 1773 1774 mz = (const mzap_phys_t *) zap_scratch; 1775 chunks = size / MZAP_ENT_LEN - 1; 1776 1777 for (i = 0; i < chunks; i++) { 1778 mze = &mz->mz_chunk[i]; 1779 if (value == mze->mze_value) { 1780 strcpy(name, mze->mze_name); 1781 return (0); 1782 } 1783 } 1784 1785 return (ENOENT); 1786 } 1787 1788 static void 1789 fzap_name_copy(const zap_leaf_t *zl, const zap_leaf_chunk_t *zc, char *name) 1790 { 1791 size_t namelen; 1792 const zap_leaf_chunk_t *nc; 1793 char *p; 1794 1795 namelen = zc->l_entry.le_name_numints; 1796 1797 nc = &ZAP_LEAF_CHUNK(zl, zc->l_entry.le_name_chunk); 1798 p = name; 1799 while (namelen > 0) { 1800 size_t len; 1801 len = namelen; 1802 if (len > ZAP_LEAF_ARRAY_BYTES) 1803 len = ZAP_LEAF_ARRAY_BYTES; 1804 memcpy(p, nc->l_array.la_array, len); 1805 p += len; 1806 namelen -= len; 1807 nc = &ZAP_LEAF_CHUNK(zl, nc->l_array.la_next); 1808 } 1809 1810 *p = '\0'; 1811 } 1812 1813 static int 1814 fzap_rlookup(const spa_t *spa, const dnode_phys_t *dnode, char *name, uint64_t value) 1815 { 1816 int bsize = dnode->dn_datablkszsec << SPA_MINBLOCKSHIFT; 1817 zap_phys_t zh = *(zap_phys_t *) zap_scratch; 1818 fat_zap_t z; 1819 int i, j; 1820 1821 if (zh.zap_magic != ZAP_MAGIC) 1822 return (EIO); 1823 1824 z.zap_block_shift = ilog2(bsize); 1825 z.zap_phys = (zap_phys_t *) zap_scratch; 1826 1827 /* 1828 * This assumes that the leaf blocks start at block 1. The 1829 * documentation isn't exactly clear on this. 1830 */ 1831 zap_leaf_t zl; 1832 zl.l_bs = z.zap_block_shift; 1833 for (i = 0; i < zh.zap_num_leafs; i++) { 1834 off_t off = (i + 1) << zl.l_bs; 1835 1836 if (dnode_read(spa, dnode, off, zap_scratch, bsize)) 1837 return (EIO); 1838 1839 zl.l_phys = (zap_leaf_phys_t *) zap_scratch; 1840 1841 for (j = 0; j < ZAP_LEAF_NUMCHUNKS(&zl); j++) { 1842 zap_leaf_chunk_t *zc; 1843 1844 zc = &ZAP_LEAF_CHUNK(&zl, j); 1845 if (zc->l_entry.le_type != ZAP_CHUNK_ENTRY) 1846 continue; 1847 if (zc->l_entry.le_value_intlen != 8 || 1848 zc->l_entry.le_value_numints != 1) 1849 continue; 1850 1851 if (fzap_leaf_value(&zl, zc) == value) { 1852 fzap_name_copy(&zl, zc, name); 1853 return (0); 1854 } 1855 } 1856 } 1857 1858 return (ENOENT); 1859 } 1860 1861 static int 1862 zap_rlookup(const spa_t *spa, const dnode_phys_t *dnode, char *name, uint64_t value) 1863 { 1864 int rc; 1865 uint64_t zap_type; 1866 size_t size = dnode->dn_datablkszsec * 512; 1867 1868 rc = dnode_read(spa, dnode, 0, zap_scratch, size); 1869 if (rc) 1870 return (rc); 1871 1872 zap_type = *(uint64_t *) zap_scratch; 1873 if (zap_type == ZBT_MICRO) 1874 return mzap_rlookup(spa, dnode, name, value); 1875 else 1876 return fzap_rlookup(spa, dnode, name, value); 1877 } 1878 1879 static int 1880 zfs_rlookup(const spa_t *spa, uint64_t objnum, char *result) 1881 { 1882 char name[256]; 1883 char component[256]; 1884 uint64_t dir_obj, parent_obj, child_dir_zapobj; 1885 dnode_phys_t child_dir_zap, dataset, dir, parent; 1886 dsl_dir_phys_t *dd; 1887 dsl_dataset_phys_t *ds; 1888 char *p; 1889 int len; 1890 1891 p = &name[sizeof(name) - 1]; 1892 *p = '\0'; 1893 1894 if (objset_get_dnode(spa, &spa->spa_mos, objnum, &dataset)) { 1895 printf("ZFS: can't find dataset %ju\n", (uintmax_t)objnum); 1896 return (EIO); 1897 } 1898 ds = (dsl_dataset_phys_t *)&dataset.dn_bonus; 1899 dir_obj = ds->ds_dir_obj; 1900 1901 for (;;) { 1902 if (objset_get_dnode(spa, &spa->spa_mos, dir_obj, &dir) != 0) 1903 return (EIO); 1904 dd = (dsl_dir_phys_t *)&dir.dn_bonus; 1905 1906 /* Actual loop condition. */ 1907 parent_obj = dd->dd_parent_obj; 1908 if (parent_obj == 0) 1909 break; 1910 1911 if (objset_get_dnode(spa, &spa->spa_mos, parent_obj, &parent) != 0) 1912 return (EIO); 1913 dd = (dsl_dir_phys_t *)&parent.dn_bonus; 1914 child_dir_zapobj = dd->dd_child_dir_zapobj; 1915 if (objset_get_dnode(spa, &spa->spa_mos, child_dir_zapobj, &child_dir_zap) != 0) 1916 return (EIO); 1917 if (zap_rlookup(spa, &child_dir_zap, component, dir_obj) != 0) 1918 return (EIO); 1919 1920 len = strlen(component); 1921 p -= len; 1922 memcpy(p, component, len); 1923 --p; 1924 *p = '/'; 1925 1926 /* Actual loop iteration. */ 1927 dir_obj = parent_obj; 1928 } 1929 1930 if (*p != '\0') 1931 ++p; 1932 strcpy(result, p); 1933 1934 return (0); 1935 } 1936 1937 static int 1938 zfs_lookup_dataset(const spa_t *spa, const char *name, uint64_t *objnum) 1939 { 1940 char element[256]; 1941 uint64_t dir_obj, child_dir_zapobj; 1942 dnode_phys_t child_dir_zap, dir; 1943 dsl_dir_phys_t *dd; 1944 const char *p, *q; 1945 1946 if (objset_get_dnode(spa, &spa->spa_mos, DMU_POOL_DIRECTORY_OBJECT, &dir)) 1947 return (EIO); 1948 if (zap_lookup(spa, &dir, DMU_POOL_ROOT_DATASET, sizeof (dir_obj), 1949 1, &dir_obj)) 1950 return (EIO); 1951 1952 p = name; 1953 for (;;) { 1954 if (objset_get_dnode(spa, &spa->spa_mos, dir_obj, &dir)) 1955 return (EIO); 1956 dd = (dsl_dir_phys_t *)&dir.dn_bonus; 1957 1958 while (*p == '/') 1959 p++; 1960 /* Actual loop condition #1. */ 1961 if (*p == '\0') 1962 break; 1963 1964 q = strchr(p, '/'); 1965 if (q) { 1966 memcpy(element, p, q - p); 1967 element[q - p] = '\0'; 1968 p = q + 1; 1969 } else { 1970 strcpy(element, p); 1971 p += strlen(p); 1972 } 1973 1974 child_dir_zapobj = dd->dd_child_dir_zapobj; 1975 if (objset_get_dnode(spa, &spa->spa_mos, child_dir_zapobj, &child_dir_zap) != 0) 1976 return (EIO); 1977 1978 /* Actual loop condition #2. */ 1979 if (zap_lookup(spa, &child_dir_zap, element, sizeof (dir_obj), 1980 1, &dir_obj) != 0) 1981 return (ENOENT); 1982 } 1983 1984 *objnum = dd->dd_head_dataset_obj; 1985 return (0); 1986 } 1987 1988 #ifndef BOOT2 1989 static int 1990 zfs_list_dataset(const spa_t *spa, uint64_t objnum/*, int pos, char *entry*/) 1991 { 1992 uint64_t dir_obj, child_dir_zapobj; 1993 dnode_phys_t child_dir_zap, dir, dataset; 1994 dsl_dataset_phys_t *ds; 1995 dsl_dir_phys_t *dd; 1996 1997 if (objset_get_dnode(spa, &spa->spa_mos, objnum, &dataset)) { 1998 printf("ZFS: can't find dataset %ju\n", (uintmax_t)objnum); 1999 return (EIO); 2000 } 2001 ds = (dsl_dataset_phys_t *) &dataset.dn_bonus; 2002 dir_obj = ds->ds_dir_obj; 2003 2004 if (objset_get_dnode(spa, &spa->spa_mos, dir_obj, &dir)) { 2005 printf("ZFS: can't find dirobj %ju\n", (uintmax_t)dir_obj); 2006 return (EIO); 2007 } 2008 dd = (dsl_dir_phys_t *)&dir.dn_bonus; 2009 2010 child_dir_zapobj = dd->dd_child_dir_zapobj; 2011 if (objset_get_dnode(spa, &spa->spa_mos, child_dir_zapobj, &child_dir_zap) != 0) { 2012 printf("ZFS: can't find child zap %ju\n", (uintmax_t)dir_obj); 2013 return (EIO); 2014 } 2015 2016 return (zap_list(spa, &child_dir_zap) != 0); 2017 } 2018 2019 int 2020 zfs_callback_dataset(const spa_t *spa, uint64_t objnum, int (*callback)(const char *, uint64_t)) 2021 { 2022 uint64_t dir_obj, child_dir_zapobj, zap_type; 2023 dnode_phys_t child_dir_zap, dir, dataset; 2024 dsl_dataset_phys_t *ds; 2025 dsl_dir_phys_t *dd; 2026 int err; 2027 2028 err = objset_get_dnode(spa, &spa->spa_mos, objnum, &dataset); 2029 if (err != 0) { 2030 printf("ZFS: can't find dataset %ju\n", (uintmax_t)objnum); 2031 return (err); 2032 } 2033 ds = (dsl_dataset_phys_t *) &dataset.dn_bonus; 2034 dir_obj = ds->ds_dir_obj; 2035 2036 err = objset_get_dnode(spa, &spa->spa_mos, dir_obj, &dir); 2037 if (err != 0) { 2038 printf("ZFS: can't find dirobj %ju\n", (uintmax_t)dir_obj); 2039 return (err); 2040 } 2041 dd = (dsl_dir_phys_t *)&dir.dn_bonus; 2042 2043 child_dir_zapobj = dd->dd_child_dir_zapobj; 2044 err = objset_get_dnode(spa, &spa->spa_mos, child_dir_zapobj, &child_dir_zap); 2045 if (err != 0) { 2046 printf("ZFS: can't find child zap %ju\n", (uintmax_t)dir_obj); 2047 return (err); 2048 } 2049 2050 err = dnode_read(spa, &child_dir_zap, 0, zap_scratch, child_dir_zap.dn_datablkszsec * 512); 2051 if (err != 0) 2052 return (err); 2053 2054 zap_type = *(uint64_t *) zap_scratch; 2055 if (zap_type == ZBT_MICRO) 2056 return mzap_list(&child_dir_zap, callback); 2057 else 2058 return fzap_list(spa, &child_dir_zap, callback); 2059 } 2060 #endif 2061 2062 /* 2063 * Find the object set given the object number of its dataset object 2064 * and return its details in *objset 2065 */ 2066 static int 2067 zfs_mount_dataset(const spa_t *spa, uint64_t objnum, objset_phys_t *objset) 2068 { 2069 dnode_phys_t dataset; 2070 dsl_dataset_phys_t *ds; 2071 2072 if (objset_get_dnode(spa, &spa->spa_mos, objnum, &dataset)) { 2073 printf("ZFS: can't find dataset %ju\n", (uintmax_t)objnum); 2074 return (EIO); 2075 } 2076 2077 ds = (dsl_dataset_phys_t *) &dataset.dn_bonus; 2078 if (zio_read(spa, &ds->ds_bp, objset)) { 2079 printf("ZFS: can't read object set for dataset %ju\n", 2080 (uintmax_t)objnum); 2081 return (EIO); 2082 } 2083 2084 return (0); 2085 } 2086 2087 /* 2088 * Find the object set pointed to by the BOOTFS property or the root 2089 * dataset if there is none and return its details in *objset 2090 */ 2091 static int 2092 zfs_get_root(const spa_t *spa, uint64_t *objid) 2093 { 2094 dnode_phys_t dir, propdir; 2095 uint64_t props, bootfs, root; 2096 2097 *objid = 0; 2098 2099 /* 2100 * Start with the MOS directory object. 2101 */ 2102 if (objset_get_dnode(spa, &spa->spa_mos, DMU_POOL_DIRECTORY_OBJECT, &dir)) { 2103 printf("ZFS: can't read MOS object directory\n"); 2104 return (EIO); 2105 } 2106 2107 /* 2108 * Lookup the pool_props and see if we can find a bootfs. 2109 */ 2110 if (zap_lookup(spa, &dir, DMU_POOL_PROPS, sizeof (props), 1, &props) == 0 2111 && objset_get_dnode(spa, &spa->spa_mos, props, &propdir) == 0 2112 && zap_lookup(spa, &propdir, "bootfs", sizeof (bootfs), 1, &bootfs) == 0 2113 && bootfs != 0) 2114 { 2115 *objid = bootfs; 2116 return (0); 2117 } 2118 /* 2119 * Lookup the root dataset directory 2120 */ 2121 if (zap_lookup(spa, &dir, DMU_POOL_ROOT_DATASET, sizeof (root), 1, &root) 2122 || objset_get_dnode(spa, &spa->spa_mos, root, &dir)) { 2123 printf("ZFS: can't find root dsl_dir\n"); 2124 return (EIO); 2125 } 2126 2127 /* 2128 * Use the information from the dataset directory's bonus buffer 2129 * to find the dataset object and from that the object set itself. 2130 */ 2131 dsl_dir_phys_t *dd = (dsl_dir_phys_t *) &dir.dn_bonus; 2132 *objid = dd->dd_head_dataset_obj; 2133 return (0); 2134 } 2135 2136 static int 2137 zfs_mount(const spa_t *spa, uint64_t rootobj, struct zfsmount *mount) 2138 { 2139 2140 mount->spa = spa; 2141 2142 /* 2143 * Find the root object set if not explicitly provided 2144 */ 2145 if (rootobj == 0 && zfs_get_root(spa, &rootobj)) { 2146 printf("ZFS: can't find root filesystem\n"); 2147 return (EIO); 2148 } 2149 2150 if (zfs_mount_dataset(spa, rootobj, &mount->objset)) { 2151 printf("ZFS: can't open root filesystem\n"); 2152 return (EIO); 2153 } 2154 2155 mount->rootobj = rootobj; 2156 2157 return (0); 2158 } 2159 2160 /* 2161 * callback function for feature name checks. 2162 */ 2163 static int 2164 check_feature(const char *name, uint64_t value) 2165 { 2166 int i; 2167 2168 if (value == 0) 2169 return (0); 2170 if (name[0] == '\0') 2171 return (0); 2172 2173 for (i = 0; features_for_read[i] != NULL; i++) { 2174 if (strcmp(name, features_for_read[i]) == 0) 2175 return (0); 2176 } 2177 printf("ZFS: unsupported feature: %s\n", name); 2178 return (EIO); 2179 } 2180 2181 /* 2182 * Checks whether the MOS features that are active are supported. 2183 */ 2184 static int 2185 check_mos_features(const spa_t *spa) 2186 { 2187 dnode_phys_t dir; 2188 uint64_t objnum, zap_type; 2189 size_t size; 2190 int rc; 2191 2192 if ((rc = objset_get_dnode(spa, &spa->spa_mos, DMU_OT_OBJECT_DIRECTORY, 2193 &dir)) != 0) 2194 return (rc); 2195 if ((rc = zap_lookup(spa, &dir, DMU_POOL_FEATURES_FOR_READ, 2196 sizeof (objnum), 1, &objnum)) != 0) { 2197 /* 2198 * It is older pool without features. As we have already 2199 * tested the label, just return without raising the error. 2200 */ 2201 return (0); 2202 } 2203 2204 if ((rc = objset_get_dnode(spa, &spa->spa_mos, objnum, &dir)) != 0) 2205 return (rc); 2206 2207 if (dir.dn_type != DMU_OTN_ZAP_METADATA) 2208 return (EIO); 2209 2210 size = dir.dn_datablkszsec * 512; 2211 if (dnode_read(spa, &dir, 0, zap_scratch, size)) 2212 return (EIO); 2213 2214 zap_type = *(uint64_t *) zap_scratch; 2215 if (zap_type == ZBT_MICRO) 2216 rc = mzap_list(&dir, check_feature); 2217 else 2218 rc = fzap_list(spa, &dir, check_feature); 2219 2220 return (rc); 2221 } 2222 2223 static int 2224 zfs_spa_init(spa_t *spa) 2225 { 2226 dnode_phys_t dir; 2227 int rc; 2228 2229 if (zio_read(spa, &spa->spa_uberblock.ub_rootbp, &spa->spa_mos)) { 2230 printf("ZFS: can't read MOS of pool %s\n", spa->spa_name); 2231 return (EIO); 2232 } 2233 if (spa->spa_mos.os_type != DMU_OST_META) { 2234 printf("ZFS: corrupted MOS of pool %s\n", spa->spa_name); 2235 return (EIO); 2236 } 2237 2238 if (objset_get_dnode(spa, &spa->spa_mos, DMU_POOL_DIRECTORY_OBJECT, 2239 &dir)) { 2240 printf("ZFS: failed to read pool %s directory object\n", 2241 spa->spa_name); 2242 return (EIO); 2243 } 2244 /* this is allowed to fail, older pools do not have salt */ 2245 rc = zap_lookup(spa, &dir, DMU_POOL_CHECKSUM_SALT, 1, 2246 sizeof (spa->spa_cksum_salt.zcs_bytes), 2247 spa->spa_cksum_salt.zcs_bytes); 2248 2249 rc = check_mos_features(spa); 2250 if (rc != 0) { 2251 printf("ZFS: pool %s is not supported\n", spa->spa_name); 2252 } 2253 2254 return (rc); 2255 } 2256 2257 static int 2258 zfs_dnode_stat(const spa_t *spa, dnode_phys_t *dn, struct stat *sb) 2259 { 2260 2261 if (dn->dn_bonustype != DMU_OT_SA) { 2262 znode_phys_t *zp = (znode_phys_t *)dn->dn_bonus; 2263 2264 sb->st_mode = zp->zp_mode; 2265 sb->st_uid = zp->zp_uid; 2266 sb->st_gid = zp->zp_gid; 2267 sb->st_size = zp->zp_size; 2268 } else { 2269 sa_hdr_phys_t *sahdrp; 2270 int hdrsize; 2271 size_t size = 0; 2272 void *buf = NULL; 2273 2274 if (dn->dn_bonuslen != 0) 2275 sahdrp = (sa_hdr_phys_t *)DN_BONUS(dn); 2276 else { 2277 if ((dn->dn_flags & DNODE_FLAG_SPILL_BLKPTR) != 0) { 2278 blkptr_t *bp = DN_SPILL_BLKPTR(dn); 2279 int error; 2280 2281 size = BP_GET_LSIZE(bp); 2282 buf = zfs_alloc(size); 2283 error = zio_read(spa, bp, buf); 2284 if (error != 0) { 2285 zfs_free(buf, size); 2286 return (error); 2287 } 2288 sahdrp = buf; 2289 } else { 2290 return (EIO); 2291 } 2292 } 2293 hdrsize = SA_HDR_SIZE(sahdrp); 2294 sb->st_mode = *(uint64_t *)((char *)sahdrp + hdrsize + 2295 SA_MODE_OFFSET); 2296 sb->st_uid = *(uint64_t *)((char *)sahdrp + hdrsize + 2297 SA_UID_OFFSET); 2298 sb->st_gid = *(uint64_t *)((char *)sahdrp + hdrsize + 2299 SA_GID_OFFSET); 2300 sb->st_size = *(uint64_t *)((char *)sahdrp + hdrsize + 2301 SA_SIZE_OFFSET); 2302 if (buf != NULL) 2303 zfs_free(buf, size); 2304 } 2305 2306 return (0); 2307 } 2308 2309 static int 2310 zfs_dnode_readlink(const spa_t *spa, dnode_phys_t *dn, char *path, size_t psize) 2311 { 2312 int rc = 0; 2313 2314 if (dn->dn_bonustype == DMU_OT_SA) { 2315 sa_hdr_phys_t *sahdrp = NULL; 2316 size_t size = 0; 2317 void *buf = NULL; 2318 int hdrsize; 2319 char *p; 2320 2321 if (dn->dn_bonuslen != 0) 2322 sahdrp = (sa_hdr_phys_t *)DN_BONUS(dn); 2323 else { 2324 blkptr_t *bp; 2325 2326 if ((dn->dn_flags & DNODE_FLAG_SPILL_BLKPTR) == 0) 2327 return (EIO); 2328 bp = DN_SPILL_BLKPTR(dn); 2329 2330 size = BP_GET_LSIZE(bp); 2331 buf = zfs_alloc(size); 2332 rc = zio_read(spa, bp, buf); 2333 if (rc != 0) { 2334 zfs_free(buf, size); 2335 return (rc); 2336 } 2337 sahdrp = buf; 2338 } 2339 hdrsize = SA_HDR_SIZE(sahdrp); 2340 p = (char *)((uintptr_t)sahdrp + hdrsize + SA_SYMLINK_OFFSET); 2341 memcpy(path, p, psize); 2342 if (buf != NULL) 2343 zfs_free(buf, size); 2344 return (0); 2345 } 2346 /* 2347 * Second test is purely to silence bogus compiler 2348 * warning about accessing past the end of dn_bonus. 2349 */ 2350 if (psize + sizeof(znode_phys_t) <= dn->dn_bonuslen && 2351 sizeof(znode_phys_t) <= sizeof(dn->dn_bonus)) { 2352 memcpy(path, &dn->dn_bonus[sizeof(znode_phys_t)], psize); 2353 } else { 2354 rc = dnode_read(spa, dn, 0, path, psize); 2355 } 2356 return (rc); 2357 } 2358 2359 struct obj_list { 2360 uint64_t objnum; 2361 STAILQ_ENTRY(obj_list) entry; 2362 }; 2363 2364 /* 2365 * Lookup a file and return its dnode. 2366 */ 2367 static int 2368 zfs_lookup(const struct zfsmount *mount, const char *upath, dnode_phys_t *dnode) 2369 { 2370 int rc; 2371 uint64_t objnum; 2372 const spa_t *spa; 2373 dnode_phys_t dn; 2374 const char *p, *q; 2375 char element[256]; 2376 char path[1024]; 2377 int symlinks_followed = 0; 2378 struct stat sb; 2379 struct obj_list *entry, *tentry; 2380 STAILQ_HEAD(, obj_list) on_cache = STAILQ_HEAD_INITIALIZER(on_cache); 2381 2382 spa = mount->spa; 2383 if (mount->objset.os_type != DMU_OST_ZFS) { 2384 printf("ZFS: unexpected object set type %ju\n", 2385 (uintmax_t)mount->objset.os_type); 2386 return (EIO); 2387 } 2388 2389 if ((entry = malloc(sizeof(struct obj_list))) == NULL) 2390 return (ENOMEM); 2391 2392 /* 2393 * Get the root directory dnode. 2394 */ 2395 rc = objset_get_dnode(spa, &mount->objset, MASTER_NODE_OBJ, &dn); 2396 if (rc) { 2397 free(entry); 2398 return (rc); 2399 } 2400 2401 rc = zap_lookup(spa, &dn, ZFS_ROOT_OBJ, sizeof (objnum), 1, &objnum); 2402 if (rc) { 2403 free(entry); 2404 return (rc); 2405 } 2406 entry->objnum = objnum; 2407 STAILQ_INSERT_HEAD(&on_cache, entry, entry); 2408 2409 rc = objset_get_dnode(spa, &mount->objset, objnum, &dn); 2410 if (rc != 0) 2411 goto done; 2412 2413 p = upath; 2414 while (p && *p) { 2415 rc = objset_get_dnode(spa, &mount->objset, objnum, &dn); 2416 if (rc != 0) 2417 goto done; 2418 2419 while (*p == '/') 2420 p++; 2421 if (*p == '\0') 2422 break; 2423 q = p; 2424 while (*q != '\0' && *q != '/') 2425 q++; 2426 2427 /* skip dot */ 2428 if (p + 1 == q && p[0] == '.') { 2429 p++; 2430 continue; 2431 } 2432 /* double dot */ 2433 if (p + 2 == q && p[0] == '.' && p[1] == '.') { 2434 p += 2; 2435 if (STAILQ_FIRST(&on_cache) == 2436 STAILQ_LAST(&on_cache, obj_list, entry)) { 2437 rc = ENOENT; 2438 goto done; 2439 } 2440 entry = STAILQ_FIRST(&on_cache); 2441 STAILQ_REMOVE_HEAD(&on_cache, entry); 2442 free(entry); 2443 objnum = (STAILQ_FIRST(&on_cache))->objnum; 2444 continue; 2445 } 2446 if (q - p + 1 > sizeof(element)) { 2447 rc = ENAMETOOLONG; 2448 goto done; 2449 } 2450 memcpy(element, p, q - p); 2451 element[q - p] = 0; 2452 p = q; 2453 2454 if ((rc = zfs_dnode_stat(spa, &dn, &sb)) != 0) 2455 goto done; 2456 if (!S_ISDIR(sb.st_mode)) { 2457 rc = ENOTDIR; 2458 goto done; 2459 } 2460 2461 rc = zap_lookup(spa, &dn, element, sizeof (objnum), 1, &objnum); 2462 if (rc) 2463 goto done; 2464 objnum = ZFS_DIRENT_OBJ(objnum); 2465 2466 if ((entry = malloc(sizeof(struct obj_list))) == NULL) { 2467 rc = ENOMEM; 2468 goto done; 2469 } 2470 entry->objnum = objnum; 2471 STAILQ_INSERT_HEAD(&on_cache, entry, entry); 2472 rc = objset_get_dnode(spa, &mount->objset, objnum, &dn); 2473 if (rc) 2474 goto done; 2475 2476 /* 2477 * Check for symlink. 2478 */ 2479 rc = zfs_dnode_stat(spa, &dn, &sb); 2480 if (rc) 2481 goto done; 2482 if (S_ISLNK(sb.st_mode)) { 2483 if (symlinks_followed > 10) { 2484 rc = EMLINK; 2485 goto done; 2486 } 2487 symlinks_followed++; 2488 2489 /* 2490 * Read the link value and copy the tail of our 2491 * current path onto the end. 2492 */ 2493 if (sb.st_size + strlen(p) + 1 > sizeof(path)) { 2494 rc = ENAMETOOLONG; 2495 goto done; 2496 } 2497 strcpy(&path[sb.st_size], p); 2498 2499 rc = zfs_dnode_readlink(spa, &dn, path, sb.st_size); 2500 if (rc != 0) 2501 goto done; 2502 2503 /* 2504 * Restart with the new path, starting either at 2505 * the root or at the parent depending whether or 2506 * not the link is relative. 2507 */ 2508 p = path; 2509 if (*p == '/') { 2510 while (STAILQ_FIRST(&on_cache) != 2511 STAILQ_LAST(&on_cache, obj_list, entry)) { 2512 entry = STAILQ_FIRST(&on_cache); 2513 STAILQ_REMOVE_HEAD(&on_cache, entry); 2514 free(entry); 2515 } 2516 } else { 2517 entry = STAILQ_FIRST(&on_cache); 2518 STAILQ_REMOVE_HEAD(&on_cache, entry); 2519 free(entry); 2520 } 2521 objnum = (STAILQ_FIRST(&on_cache))->objnum; 2522 } 2523 } 2524 2525 *dnode = dn; 2526 done: 2527 STAILQ_FOREACH_SAFE(entry, &on_cache, entry, tentry) 2528 free(entry); 2529 return (rc); 2530 } 2531