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/11/stand/libsa/zfs/zfsimpl.c 346477 2019-04-21 03:43:27Z kevans $"); 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}; 46static struct zfsmount zfsmount __unused; 47 48/* 49 * List of all vdevs, chained through v_alllink. 50 */ 51static vdev_list_t zfs_vdevs; 52 53 /* 54 * List of ZFS features supported for read 55 */ 56static const char *features_for_read[] = { 57 "org.illumos:lz4_compress", 58 "com.delphix:hole_birth", 59 "com.delphix:extensible_dataset", 60 "com.delphix:embedded_data", 61 "org.open-zfs:large_blocks", 62 "org.illumos:sha512", 63 "org.illumos:skein", 64 "org.zfsonlinux:large_dnode", 65 "com.joyent:multi_vdev_crash_dump", 66 NULL 67}; 68 69/* 70 * List of all pools, chained through spa_link. 71 */ 72static spa_list_t zfs_pools; 73 74static const dnode_phys_t *dnode_cache_obj; 75static uint64_t dnode_cache_bn; 76static char *dnode_cache_buf; 77static char *zap_scratch; 78static char *zfs_temp_buf, *zfs_temp_end, *zfs_temp_ptr; 79 80#define TEMP_SIZE (1024 * 1024) 81 82static int zio_read(const spa_t *spa, const blkptr_t *bp, void *buf); 83static int zfs_get_root(const spa_t *spa, uint64_t *objid); 84static int zfs_rlookup(const spa_t *spa, uint64_t objnum, char *result); 85static int zap_lookup(const spa_t *spa, const dnode_phys_t *dnode, 86 const char *name, uint64_t integer_size, uint64_t num_integers, 87 void *value); 88 89static void 90zfs_init(void) 91{ 92 STAILQ_INIT(&zfs_vdevs); 93 STAILQ_INIT(&zfs_pools); 94 95 zfs_temp_buf = malloc(TEMP_SIZE); 96 zfs_temp_end = zfs_temp_buf + TEMP_SIZE; 97 zfs_temp_ptr = zfs_temp_buf; 98 dnode_cache_buf = malloc(SPA_MAXBLOCKSIZE); 99 zap_scratch = malloc(SPA_MAXBLOCKSIZE); 100 101 zfs_init_crc(); 102} 103 104static void * 105zfs_alloc(size_t size) 106{ 107 char *ptr; 108 109 if (zfs_temp_ptr + size > zfs_temp_end) { 110 printf("ZFS: out of temporary buffer space\n"); 111 for (;;) ; 112 } 113 ptr = zfs_temp_ptr; 114 zfs_temp_ptr += size; 115 116 return (ptr); 117} 118 119static void 120zfs_free(void *ptr, size_t size) 121{ 122 123 zfs_temp_ptr -= size; 124 if (zfs_temp_ptr != ptr) { 125 printf("ZFS: zfs_alloc()/zfs_free() mismatch\n"); 126 for (;;) ; 127 } 128} 129 130static int 131xdr_int(const unsigned char **xdr, int *ip) 132{ 133 *ip = ((*xdr)[0] << 24) 134 | ((*xdr)[1] << 16) 135 | ((*xdr)[2] << 8) 136 | ((*xdr)[3] << 0); 137 (*xdr) += 4; 138 return (0); 139} 140 141static int 142xdr_u_int(const unsigned char **xdr, u_int *ip) 143{ 144 *ip = ((*xdr)[0] << 24) 145 | ((*xdr)[1] << 16) 146 | ((*xdr)[2] << 8) 147 | ((*xdr)[3] << 0); 148 (*xdr) += 4; 149 return (0); 150} 151 152static int 153xdr_uint64_t(const unsigned char **xdr, uint64_t *lp) 154{ 155 u_int hi, lo; 156 157 xdr_u_int(xdr, &hi); 158 xdr_u_int(xdr, &lo); 159 *lp = (((uint64_t) hi) << 32) | lo; 160 return (0); 161} 162 163static int 164nvlist_find(const unsigned char *nvlist, const char *name, int type, 165 int* elementsp, void *valuep) 166{ 167 const unsigned char *p, *pair; 168 int junk; 169 int encoded_size, decoded_size; 170 171 p = nvlist; 172 xdr_int(&p, &junk); 173 xdr_int(&p, &junk); 174 175 pair = p; 176 xdr_int(&p, &encoded_size); 177 xdr_int(&p, &decoded_size); 178 while (encoded_size && decoded_size) { 179 int namelen, pairtype, elements; 180 const char *pairname; 181 182 xdr_int(&p, &namelen); 183 pairname = (const char*) p; 184 p += roundup(namelen, 4); 185 xdr_int(&p, &pairtype); 186 187 if (!memcmp(name, pairname, namelen) && type == pairtype) { 188 xdr_int(&p, &elements); 189 if (elementsp) 190 *elementsp = elements; 191 if (type == DATA_TYPE_UINT64) { 192 xdr_uint64_t(&p, (uint64_t *) valuep); 193 return (0); 194 } else if (type == DATA_TYPE_STRING) { 195 int len; 196 xdr_int(&p, &len); 197 (*(const char**) valuep) = (const char*) p; 198 return (0); 199 } else if (type == DATA_TYPE_NVLIST 200 || type == DATA_TYPE_NVLIST_ARRAY) { 201 (*(const unsigned char**) valuep) = 202 (const unsigned char*) p; 203 return (0); 204 } else { 205 return (EIO); 206 } 207 } else { 208 /* 209 * Not the pair we are looking for, skip to the next one. 210 */ 211 p = pair + encoded_size; 212 } 213 214 pair = p; 215 xdr_int(&p, &encoded_size); 216 xdr_int(&p, &decoded_size); 217 } 218 219 return (EIO); 220} 221 222static int 223nvlist_check_features_for_read(const unsigned char *nvlist) 224{ 225 const unsigned char *p, *pair; 226 int junk; 227 int encoded_size, decoded_size; 228 int rc; 229 230 rc = 0; 231 232 p = nvlist; 233 xdr_int(&p, &junk); 234 xdr_int(&p, &junk); 235 236 pair = p; 237 xdr_int(&p, &encoded_size); 238 xdr_int(&p, &decoded_size); 239 while (encoded_size && decoded_size) { 240 int namelen, pairtype; 241 const char *pairname; 242 int i, found; 243 244 found = 0; 245 246 xdr_int(&p, &namelen); 247 pairname = (const char*) p; 248 p += roundup(namelen, 4); 249 xdr_int(&p, &pairtype); 250 251 for (i = 0; features_for_read[i] != NULL; i++) { 252 if (!memcmp(pairname, features_for_read[i], namelen)) { 253 found = 1; 254 break; 255 } 256 } 257 258 if (!found) { 259 printf("ZFS: unsupported feature: %s\n", pairname); 260 rc = EIO; 261 } 262 263 p = pair + encoded_size; 264 265 pair = p; 266 xdr_int(&p, &encoded_size); 267 xdr_int(&p, &decoded_size); 268 } 269 270 return (rc); 271} 272 273/* 274 * Return the next nvlist in an nvlist array. 275 */ 276static const unsigned char * 277nvlist_next(const unsigned char *nvlist) 278{ 279 const unsigned char *p, *pair; 280 int junk; 281 int encoded_size, decoded_size; 282 283 p = nvlist; 284 xdr_int(&p, &junk); 285 xdr_int(&p, &junk); 286 287 pair = p; 288 xdr_int(&p, &encoded_size); 289 xdr_int(&p, &decoded_size); 290 while (encoded_size && decoded_size) { 291 p = pair + encoded_size; 292 293 pair = p; 294 xdr_int(&p, &encoded_size); 295 xdr_int(&p, &decoded_size); 296 } 297 298 return p; 299} 300 301#ifdef TEST 302 303static const unsigned char * 304nvlist_print(const unsigned char *nvlist, unsigned int indent) 305{ 306 static const char* typenames[] = { 307 "DATA_TYPE_UNKNOWN", 308 "DATA_TYPE_BOOLEAN", 309 "DATA_TYPE_BYTE", 310 "DATA_TYPE_INT16", 311 "DATA_TYPE_UINT16", 312 "DATA_TYPE_INT32", 313 "DATA_TYPE_UINT32", 314 "DATA_TYPE_INT64", 315 "DATA_TYPE_UINT64", 316 "DATA_TYPE_STRING", 317 "DATA_TYPE_BYTE_ARRAY", 318 "DATA_TYPE_INT16_ARRAY", 319 "DATA_TYPE_UINT16_ARRAY", 320 "DATA_TYPE_INT32_ARRAY", 321 "DATA_TYPE_UINT32_ARRAY", 322 "DATA_TYPE_INT64_ARRAY", 323 "DATA_TYPE_UINT64_ARRAY", 324 "DATA_TYPE_STRING_ARRAY", 325 "DATA_TYPE_HRTIME", 326 "DATA_TYPE_NVLIST", 327 "DATA_TYPE_NVLIST_ARRAY", 328 "DATA_TYPE_BOOLEAN_VALUE", 329 "DATA_TYPE_INT8", 330 "DATA_TYPE_UINT8", 331 "DATA_TYPE_BOOLEAN_ARRAY", 332 "DATA_TYPE_INT8_ARRAY", 333 "DATA_TYPE_UINT8_ARRAY" 334 }; 335 336 unsigned int i, j; 337 const unsigned char *p, *pair; 338 int junk; 339 int encoded_size, decoded_size; 340 341 p = nvlist; 342 xdr_int(&p, &junk); 343 xdr_int(&p, &junk); 344 345 pair = p; 346 xdr_int(&p, &encoded_size); 347 xdr_int(&p, &decoded_size); 348 while (encoded_size && decoded_size) { 349 int namelen, pairtype, elements; 350 const char *pairname; 351 352 xdr_int(&p, &namelen); 353 pairname = (const char*) p; 354 p += roundup(namelen, 4); 355 xdr_int(&p, &pairtype); 356 357 for (i = 0; i < indent; i++) 358 printf(" "); 359 printf("%s %s", typenames[pairtype], pairname); 360 361 xdr_int(&p, &elements); 362 switch (pairtype) { 363 case DATA_TYPE_UINT64: { 364 uint64_t val; 365 xdr_uint64_t(&p, &val); 366 printf(" = 0x%jx\n", (uintmax_t)val); 367 break; 368 } 369 370 case DATA_TYPE_STRING: { 371 int len; 372 xdr_int(&p, &len); 373 printf(" = \"%s\"\n", p); 374 break; 375 } 376 377 case DATA_TYPE_NVLIST: 378 printf("\n"); 379 nvlist_print(p, indent + 1); 380 break; 381 382 case DATA_TYPE_NVLIST_ARRAY: 383 for (j = 0; j < elements; j++) { 384 printf("[%d]\n", j); 385 p = nvlist_print(p, indent + 1); 386 if (j != elements - 1) { 387 for (i = 0; i < indent; i++) 388 printf(" "); 389 printf("%s %s", typenames[pairtype], pairname); 390 } 391 } 392 break; 393 394 default: 395 printf("\n"); 396 } 397 398 p = pair + encoded_size; 399 400 pair = p; 401 xdr_int(&p, &encoded_size); 402 xdr_int(&p, &decoded_size); 403 } 404 405 return p; 406} 407 408#endif 409 410static int 411vdev_read_phys(vdev_t *vdev, const blkptr_t *bp, void *buf, 412 off_t offset, size_t size) 413{ 414 size_t psize; 415 int rc; 416 417 if (!vdev->v_phys_read) 418 return (EIO); 419 420 if (bp) { 421 psize = BP_GET_PSIZE(bp); 422 } else { 423 psize = size; 424 } 425 426 /*printf("ZFS: reading %zu bytes at 0x%jx to %p\n", psize, (uintmax_t)offset, buf);*/ 427 rc = vdev->v_phys_read(vdev, vdev->v_read_priv, offset, buf, psize); 428 if (rc) 429 return (rc); 430 if (bp && zio_checksum_verify(vdev->spa, bp, buf)) 431 return (EIO); 432 433 return (0); 434} 435 436static int 437vdev_disk_read(vdev_t *vdev, const blkptr_t *bp, void *buf, 438 off_t offset, size_t bytes) 439{ 440 441 return (vdev_read_phys(vdev, bp, buf, 442 offset + VDEV_LABEL_START_SIZE, bytes)); 443} 444 445 446static int 447vdev_mirror_read(vdev_t *vdev, const blkptr_t *bp, void *buf, 448 off_t offset, size_t bytes) 449{ 450 vdev_t *kid; 451 int rc; 452 453 rc = EIO; 454 STAILQ_FOREACH(kid, &vdev->v_children, v_childlink) { 455 if (kid->v_state != VDEV_STATE_HEALTHY) 456 continue; 457 rc = kid->v_read(kid, bp, buf, offset, bytes); 458 if (!rc) 459 return (0); 460 } 461 462 return (rc); 463} 464 465static int 466vdev_replacing_read(vdev_t *vdev, const blkptr_t *bp, void *buf, 467 off_t offset, size_t bytes) 468{ 469 vdev_t *kid; 470 471 /* 472 * Here we should have two kids: 473 * First one which is the one we are replacing and we can trust 474 * only this one to have valid data, but it might not be present. 475 * Second one is that one we are replacing with. It is most likely 476 * healthy, but we can't trust it has needed data, so we won't use it. 477 */ 478 kid = STAILQ_FIRST(&vdev->v_children); 479 if (kid == NULL) 480 return (EIO); 481 if (kid->v_state != VDEV_STATE_HEALTHY) 482 return (EIO); 483 return (kid->v_read(kid, bp, buf, offset, bytes)); 484} 485 486static vdev_t * 487vdev_find(uint64_t guid) 488{ 489 vdev_t *vdev; 490 491 STAILQ_FOREACH(vdev, &zfs_vdevs, v_alllink) 492 if (vdev->v_guid == guid) 493 return (vdev); 494 495 return (0); 496} 497 498static vdev_t * 499vdev_create(uint64_t guid, vdev_read_t *_read) 500{ 501 vdev_t *vdev; 502 503 vdev = malloc(sizeof(vdev_t)); 504 memset(vdev, 0, sizeof(vdev_t)); 505 STAILQ_INIT(&vdev->v_children); 506 vdev->v_guid = guid; 507 vdev->v_state = VDEV_STATE_OFFLINE; 508 vdev->v_read = _read; 509 vdev->v_phys_read = 0; 510 vdev->v_read_priv = 0; 511 STAILQ_INSERT_TAIL(&zfs_vdevs, vdev, v_alllink); 512 513 return (vdev); 514} 515 516static int 517vdev_init_from_nvlist(const unsigned char *nvlist, vdev_t *pvdev, 518 vdev_t **vdevp, int is_newer) 519{ 520 int rc; 521 uint64_t guid, id, ashift, nparity; 522 const char *type; 523 const char *path; 524 vdev_t *vdev, *kid; 525 const unsigned char *kids; 526 int nkids, i, is_new; 527 uint64_t is_offline, is_faulted, is_degraded, is_removed, isnt_present; 528 529 if (nvlist_find(nvlist, ZPOOL_CONFIG_GUID, DATA_TYPE_UINT64, 530 NULL, &guid) 531 || nvlist_find(nvlist, ZPOOL_CONFIG_ID, DATA_TYPE_UINT64, NULL, &id) 532 || nvlist_find(nvlist, ZPOOL_CONFIG_TYPE, DATA_TYPE_STRING, 533 NULL, &type)) { 534 printf("ZFS: can't find vdev details\n"); 535 return (ENOENT); 536 } 537 538 if (strcmp(type, VDEV_TYPE_MIRROR) 539 && strcmp(type, VDEV_TYPE_DISK) 540#ifdef ZFS_TEST 541 && strcmp(type, VDEV_TYPE_FILE) 542#endif 543 && strcmp(type, VDEV_TYPE_RAIDZ) 544 && strcmp(type, VDEV_TYPE_REPLACING)) { 545 printf("ZFS: can only boot from disk, mirror, raidz1, raidz2 and raidz3 vdevs\n"); 546 return (EIO); 547 } 548 549 is_offline = is_removed = is_faulted = is_degraded = isnt_present = 0; 550 551 nvlist_find(nvlist, ZPOOL_CONFIG_OFFLINE, DATA_TYPE_UINT64, NULL, 552 &is_offline); 553 nvlist_find(nvlist, ZPOOL_CONFIG_REMOVED, DATA_TYPE_UINT64, NULL, 554 &is_removed); 555 nvlist_find(nvlist, ZPOOL_CONFIG_FAULTED, DATA_TYPE_UINT64, NULL, 556 &is_faulted); 557 nvlist_find(nvlist, ZPOOL_CONFIG_DEGRADED, DATA_TYPE_UINT64, NULL, 558 &is_degraded); 559 nvlist_find(nvlist, ZPOOL_CONFIG_NOT_PRESENT, DATA_TYPE_UINT64, NULL, 560 &isnt_present); 561 562 vdev = vdev_find(guid); 563 if (!vdev) { 564 is_new = 1; 565 566 if (!strcmp(type, VDEV_TYPE_MIRROR)) 567 vdev = vdev_create(guid, vdev_mirror_read); 568 else if (!strcmp(type, VDEV_TYPE_RAIDZ)) 569 vdev = vdev_create(guid, vdev_raidz_read); 570 else if (!strcmp(type, VDEV_TYPE_REPLACING)) 571 vdev = vdev_create(guid, vdev_replacing_read); 572 else 573 vdev = vdev_create(guid, vdev_disk_read); 574 575 vdev->v_id = id; 576 vdev->v_top = pvdev != NULL ? pvdev : vdev; 577 if (nvlist_find(nvlist, ZPOOL_CONFIG_ASHIFT, 578 DATA_TYPE_UINT64, NULL, &ashift) == 0) { 579 vdev->v_ashift = ashift; 580 } else { 581 vdev->v_ashift = 0; 582 } 583 if (nvlist_find(nvlist, ZPOOL_CONFIG_NPARITY, 584 DATA_TYPE_UINT64, NULL, &nparity) == 0) { 585 vdev->v_nparity = nparity; 586 } else { 587 vdev->v_nparity = 0; 588 } 589 if (nvlist_find(nvlist, ZPOOL_CONFIG_PATH, 590 DATA_TYPE_STRING, NULL, &path) == 0) { 591 if (strncmp(path, "/dev/", 5) == 0) 592 path += 5; 593 vdev->v_name = strdup(path); 594 } else { 595 if (!strcmp(type, "raidz")) { 596 if (vdev->v_nparity == 1) 597 vdev->v_name = "raidz1"; 598 else if (vdev->v_nparity == 2) 599 vdev->v_name = "raidz2"; 600 else if (vdev->v_nparity == 3) 601 vdev->v_name = "raidz3"; 602 else { 603 printf("ZFS: can only boot from disk, mirror, raidz1, raidz2 and raidz3 vdevs\n"); 604 return (EIO); 605 } 606 } else { 607 vdev->v_name = strdup(type); 608 } 609 } 610 } else { 611 is_new = 0; 612 } 613 614 if (is_new || is_newer) { 615 /* 616 * This is either new vdev or we've already seen this vdev, 617 * but from an older vdev label, so let's refresh its state 618 * from the newer label. 619 */ 620 if (is_offline) 621 vdev->v_state = VDEV_STATE_OFFLINE; 622 else if (is_removed) 623 vdev->v_state = VDEV_STATE_REMOVED; 624 else if (is_faulted) 625 vdev->v_state = VDEV_STATE_FAULTED; 626 else if (is_degraded) 627 vdev->v_state = VDEV_STATE_DEGRADED; 628 else if (isnt_present) 629 vdev->v_state = VDEV_STATE_CANT_OPEN; 630 } 631 632 rc = nvlist_find(nvlist, ZPOOL_CONFIG_CHILDREN, DATA_TYPE_NVLIST_ARRAY, 633 &nkids, &kids); 634 /* 635 * Its ok if we don't have any kids. 636 */ 637 if (rc == 0) { 638 vdev->v_nchildren = nkids; 639 for (i = 0; i < nkids; i++) { 640 rc = vdev_init_from_nvlist(kids, vdev, &kid, is_newer); 641 if (rc) 642 return (rc); 643 if (is_new) 644 STAILQ_INSERT_TAIL(&vdev->v_children, kid, 645 v_childlink); 646 kids = nvlist_next(kids); 647 } 648 } else { 649 vdev->v_nchildren = 0; 650 } 651 652 if (vdevp) 653 *vdevp = vdev; 654 return (0); 655} 656 657static void 658vdev_set_state(vdev_t *vdev) 659{ 660 vdev_t *kid; 661 int good_kids; 662 int bad_kids; 663 664 /* 665 * A mirror or raidz is healthy if all its kids are healthy. A 666 * mirror is degraded if any of its kids is healthy; a raidz 667 * is degraded if at most nparity kids are offline. 668 */ 669 if (STAILQ_FIRST(&vdev->v_children)) { 670 good_kids = 0; 671 bad_kids = 0; 672 STAILQ_FOREACH(kid, &vdev->v_children, v_childlink) { 673 if (kid->v_state == VDEV_STATE_HEALTHY) 674 good_kids++; 675 else 676 bad_kids++; 677 } 678 if (bad_kids == 0) { 679 vdev->v_state = VDEV_STATE_HEALTHY; 680 } else { 681 if (vdev->v_read == vdev_mirror_read) { 682 if (good_kids) { 683 vdev->v_state = VDEV_STATE_DEGRADED; 684 } else { 685 vdev->v_state = VDEV_STATE_OFFLINE; 686 } 687 } else if (vdev->v_read == vdev_raidz_read) { 688 if (bad_kids > vdev->v_nparity) { 689 vdev->v_state = VDEV_STATE_OFFLINE; 690 } else { 691 vdev->v_state = VDEV_STATE_DEGRADED; 692 } 693 } 694 } 695 } 696} 697 698static spa_t * 699spa_find_by_guid(uint64_t guid) 700{ 701 spa_t *spa; 702 703 STAILQ_FOREACH(spa, &zfs_pools, spa_link) 704 if (spa->spa_guid == guid) 705 return (spa); 706 707 return (0); 708} 709 710static spa_t * 711spa_find_by_name(const char *name) 712{ 713 spa_t *spa; 714 715 STAILQ_FOREACH(spa, &zfs_pools, spa_link) 716 if (!strcmp(spa->spa_name, name)) 717 return (spa); 718 719 return (0); 720} 721 722#ifdef BOOT2 723static spa_t * 724spa_get_primary(void) 725{ 726 727 return (STAILQ_FIRST(&zfs_pools)); 728} 729 730static vdev_t * 731spa_get_primary_vdev(const spa_t *spa) 732{ 733 vdev_t *vdev; 734 vdev_t *kid; 735 736 if (spa == NULL) 737 spa = spa_get_primary(); 738 if (spa == NULL) 739 return (NULL); 740 vdev = STAILQ_FIRST(&spa->spa_vdevs); 741 if (vdev == NULL) 742 return (NULL); 743 for (kid = STAILQ_FIRST(&vdev->v_children); kid != NULL; 744 kid = STAILQ_FIRST(&vdev->v_children)) 745 vdev = kid; 746 return (vdev); 747} 748#endif 749 750static spa_t * 751spa_create(uint64_t guid, const char *name) 752{ 753 spa_t *spa; 754 755 if ((spa = malloc(sizeof(spa_t))) == NULL) 756 return (NULL); 757 memset(spa, 0, sizeof(spa_t)); 758 if ((spa->spa_name = strdup(name)) == NULL) { 759 free(spa); 760 return (NULL); 761 } 762 STAILQ_INIT(&spa->spa_vdevs); 763 spa->spa_guid = guid; 764 STAILQ_INSERT_TAIL(&zfs_pools, spa, spa_link); 765 766 return (spa); 767} 768 769static const char * 770state_name(vdev_state_t state) 771{ 772 static const char* names[] = { 773 "UNKNOWN", 774 "CLOSED", 775 "OFFLINE", 776 "REMOVED", 777 "CANT_OPEN", 778 "FAULTED", 779 "DEGRADED", 780 "ONLINE" 781 }; 782 return names[state]; 783} 784 785#ifdef BOOT2 786 787#define pager_printf printf 788 789#else 790 791static int 792pager_printf(const char *fmt, ...) 793{ 794 char line[80]; 795 va_list args; 796 797 va_start(args, fmt); 798 vsprintf(line, fmt, args); 799 va_end(args); 800 801 return (pager_output(line)); 802} 803 804#endif 805 806#define STATUS_FORMAT " %s %s\n" 807 808static int 809print_state(int indent, const char *name, vdev_state_t state) 810{ 811 char buf[512]; 812 int i; 813 814 buf[0] = 0; 815 for (i = 0; i < indent; i++) 816 strcat(buf, " "); 817 strcat(buf, name); 818 819 return (pager_printf(STATUS_FORMAT, buf, state_name(state))); 820} 821 822static int 823vdev_status(vdev_t *vdev, int indent) 824{ 825 vdev_t *kid; 826 int ret; 827 ret = print_state(indent, vdev->v_name, vdev->v_state); 828 if (ret != 0) 829 return (ret); 830 831 STAILQ_FOREACH(kid, &vdev->v_children, v_childlink) { 832 ret = vdev_status(kid, indent + 1); 833 if (ret != 0) 834 return (ret); 835 } 836 return (ret); 837} 838 839static int 840spa_status(spa_t *spa) 841{ 842 static char bootfs[ZFS_MAXNAMELEN]; 843 uint64_t rootid; 844 vdev_t *vdev; 845 int good_kids, bad_kids, degraded_kids, ret; 846 vdev_state_t state; 847 848 ret = pager_printf(" pool: %s\n", spa->spa_name); 849 if (ret != 0) 850 return (ret); 851 852 if (zfs_get_root(spa, &rootid) == 0 && 853 zfs_rlookup(spa, rootid, bootfs) == 0) { 854 if (bootfs[0] == '\0') 855 ret = pager_printf("bootfs: %s\n", spa->spa_name); 856 else 857 ret = pager_printf("bootfs: %s/%s\n", spa->spa_name, 858 bootfs); 859 if (ret != 0) 860 return (ret); 861 } 862 ret = pager_printf("config:\n\n"); 863 if (ret != 0) 864 return (ret); 865 ret = pager_printf(STATUS_FORMAT, "NAME", "STATE"); 866 if (ret != 0) 867 return (ret); 868 869 good_kids = 0; 870 degraded_kids = 0; 871 bad_kids = 0; 872 STAILQ_FOREACH(vdev, &spa->spa_vdevs, v_childlink) { 873 if (vdev->v_state == VDEV_STATE_HEALTHY) 874 good_kids++; 875 else if (vdev->v_state == VDEV_STATE_DEGRADED) 876 degraded_kids++; 877 else 878 bad_kids++; 879 } 880 881 state = VDEV_STATE_CLOSED; 882 if (good_kids > 0 && (degraded_kids + bad_kids) == 0) 883 state = VDEV_STATE_HEALTHY; 884 else if ((good_kids + degraded_kids) > 0) 885 state = VDEV_STATE_DEGRADED; 886 887 ret = print_state(0, spa->spa_name, state); 888 if (ret != 0) 889 return (ret); 890 STAILQ_FOREACH(vdev, &spa->spa_vdevs, v_childlink) { 891 ret = vdev_status(vdev, 1); 892 if (ret != 0) 893 return (ret); 894 } 895 return (ret); 896} 897 898static int 899spa_all_status(void) 900{ 901 spa_t *spa; 902 int first = 1, ret = 0; 903 904 STAILQ_FOREACH(spa, &zfs_pools, spa_link) { 905 if (!first) { 906 ret = pager_printf("\n"); 907 if (ret != 0) 908 return (ret); 909 } 910 first = 0; 911 ret = spa_status(spa); 912 if (ret != 0) 913 return (ret); 914 } 915 return (ret); 916} 917 918static uint64_t 919vdev_label_offset(uint64_t psize, int l, uint64_t offset) 920{ 921 uint64_t label_offset; 922 923 if (l < VDEV_LABELS / 2) 924 label_offset = 0; 925 else 926 label_offset = psize - VDEV_LABELS * sizeof (vdev_label_t); 927 928 return (offset + l * sizeof (vdev_label_t) + label_offset); 929} 930 931static int 932vdev_probe(vdev_phys_read_t *_read, void *read_priv, spa_t **spap) 933{ 934 vdev_t vtmp; 935 vdev_phys_t *vdev_label = (vdev_phys_t *) zap_scratch; 936 vdev_phys_t *tmp_label; 937 spa_t *spa; 938 vdev_t *vdev, *top_vdev, *pool_vdev; 939 off_t off; 940 blkptr_t bp; 941 const unsigned char *nvlist = NULL; 942 uint64_t val; 943 uint64_t guid; 944 uint64_t best_txg = 0; 945 uint64_t pool_txg, pool_guid; 946 uint64_t psize; 947 const char *pool_name; 948 const unsigned char *vdevs; 949 const unsigned char *features; 950 int i, l, rc, is_newer; 951 char *upbuf; 952 const struct uberblock *up; 953 954 /* 955 * Load the vdev label and figure out which 956 * uberblock is most current. 957 */ 958 memset(&vtmp, 0, sizeof(vtmp)); 959 vtmp.v_phys_read = _read; 960 vtmp.v_read_priv = read_priv; 961 psize = P2ALIGN(ldi_get_size(read_priv), 962 (uint64_t)sizeof (vdev_label_t)); 963 964 /* Test for minimum pool size. */ 965 if (psize < SPA_MINDEVSIZE) 966 return (EIO); 967 968 tmp_label = zfs_alloc(sizeof(vdev_phys_t)); 969 970 for (l = 0; l < VDEV_LABELS; l++) { 971 off = vdev_label_offset(psize, l, 972 offsetof(vdev_label_t, vl_vdev_phys)); 973 974 BP_ZERO(&bp); 975 BP_SET_LSIZE(&bp, sizeof(vdev_phys_t)); 976 BP_SET_PSIZE(&bp, sizeof(vdev_phys_t)); 977 BP_SET_CHECKSUM(&bp, ZIO_CHECKSUM_LABEL); 978 BP_SET_COMPRESS(&bp, ZIO_COMPRESS_OFF); 979 DVA_SET_OFFSET(BP_IDENTITY(&bp), off); 980 ZIO_SET_CHECKSUM(&bp.blk_cksum, off, 0, 0, 0); 981 982 if (vdev_read_phys(&vtmp, &bp, tmp_label, off, 0)) 983 continue; 984 985 if (tmp_label->vp_nvlist[0] != NV_ENCODE_XDR) 986 continue; 987 988 nvlist = (const unsigned char *) tmp_label->vp_nvlist + 4; 989 if (nvlist_find(nvlist, ZPOOL_CONFIG_POOL_TXG, 990 DATA_TYPE_UINT64, NULL, &pool_txg) != 0) 991 continue; 992 993 if (best_txg <= pool_txg) { 994 best_txg = pool_txg; 995 memcpy(vdev_label, tmp_label, sizeof (vdev_phys_t)); 996 } 997 } 998 999 zfs_free(tmp_label, sizeof (vdev_phys_t)); 1000 1001 if (best_txg == 0) 1002 return (EIO); 1003 1004 if (vdev_label->vp_nvlist[0] != NV_ENCODE_XDR) 1005 return (EIO); 1006 1007 nvlist = (const unsigned char *) vdev_label->vp_nvlist + 4; 1008 1009 if (nvlist_find(nvlist, ZPOOL_CONFIG_VERSION, DATA_TYPE_UINT64, 1010 NULL, &val) != 0) { 1011 return (EIO); 1012 } 1013 1014 if (!SPA_VERSION_IS_SUPPORTED(val)) { 1015 printf("ZFS: unsupported ZFS version %u (should be %u)\n", 1016 (unsigned) val, (unsigned) SPA_VERSION); 1017 return (EIO); 1018 } 1019 1020 /* Check ZFS features for read */ 1021 if (nvlist_find(nvlist, ZPOOL_CONFIG_FEATURES_FOR_READ, 1022 DATA_TYPE_NVLIST, NULL, &features) == 0 && 1023 nvlist_check_features_for_read(features) != 0) { 1024 return (EIO); 1025 } 1026 1027 if (nvlist_find(nvlist, ZPOOL_CONFIG_POOL_STATE, DATA_TYPE_UINT64, 1028 NULL, &val) != 0) { 1029 return (EIO); 1030 } 1031 1032 if (val == POOL_STATE_DESTROYED) { 1033 /* We don't boot only from destroyed pools. */ 1034 return (EIO); 1035 } 1036 1037 if (nvlist_find(nvlist, ZPOOL_CONFIG_POOL_TXG, DATA_TYPE_UINT64, 1038 NULL, &pool_txg) != 0 || 1039 nvlist_find(nvlist, ZPOOL_CONFIG_POOL_GUID, DATA_TYPE_UINT64, 1040 NULL, &pool_guid) != 0 || 1041 nvlist_find(nvlist, ZPOOL_CONFIG_POOL_NAME, DATA_TYPE_STRING, 1042 NULL, &pool_name) != 0) { 1043 /* 1044 * Cache and spare devices end up here - just ignore 1045 * them. 1046 */ 1047 /*printf("ZFS: can't find pool details\n");*/ 1048 return (EIO); 1049 } 1050 1051 if (nvlist_find(nvlist, ZPOOL_CONFIG_IS_LOG, DATA_TYPE_UINT64, 1052 NULL, &val) == 0 && val != 0) { 1053 return (EIO); 1054 } 1055 1056 /* 1057 * Create the pool if this is the first time we've seen it. 1058 */ 1059 spa = spa_find_by_guid(pool_guid); 1060 if (spa == NULL) { 1061 spa = spa_create(pool_guid, pool_name); 1062 if (spa == NULL) 1063 return (ENOMEM); 1064 } 1065 if (pool_txg > spa->spa_txg) { 1066 spa->spa_txg = pool_txg; 1067 is_newer = 1; 1068 } else { 1069 is_newer = 0; 1070 } 1071 1072 /* 1073 * Get the vdev tree and create our in-core copy of it. 1074 * If we already have a vdev with this guid, this must 1075 * be some kind of alias (overlapping slices, dangerously dedicated 1076 * disks etc). 1077 */ 1078 if (nvlist_find(nvlist, ZPOOL_CONFIG_GUID, DATA_TYPE_UINT64, 1079 NULL, &guid) != 0) { 1080 return (EIO); 1081 } 1082 vdev = vdev_find(guid); 1083 if (vdev && vdev->v_phys_read) /* Has this vdev already been inited? */ 1084 return (EIO); 1085 1086 if (nvlist_find(nvlist, ZPOOL_CONFIG_VDEV_TREE, DATA_TYPE_NVLIST, 1087 NULL, &vdevs)) { 1088 return (EIO); 1089 } 1090 1091 rc = vdev_init_from_nvlist(vdevs, NULL, &top_vdev, is_newer); 1092 if (rc != 0) 1093 return (rc); 1094 1095 /* 1096 * Add the toplevel vdev to the pool if its not already there. 1097 */ 1098 STAILQ_FOREACH(pool_vdev, &spa->spa_vdevs, v_childlink) 1099 if (top_vdev == pool_vdev) 1100 break; 1101 if (!pool_vdev && top_vdev) { 1102 top_vdev->spa = spa; 1103 STAILQ_INSERT_TAIL(&spa->spa_vdevs, top_vdev, v_childlink); 1104 } 1105 1106 /* 1107 * We should already have created an incomplete vdev for this 1108 * vdev. Find it and initialise it with our read proc. 1109 */ 1110 vdev = vdev_find(guid); 1111 if (vdev) { 1112 vdev->v_phys_read = _read; 1113 vdev->v_read_priv = read_priv; 1114 vdev->v_state = VDEV_STATE_HEALTHY; 1115 } else { 1116 printf("ZFS: inconsistent nvlist contents\n"); 1117 return (EIO); 1118 } 1119 1120 /* 1121 * Re-evaluate top-level vdev state. 1122 */ 1123 vdev_set_state(top_vdev); 1124 1125 /* 1126 * Ok, we are happy with the pool so far. Lets find 1127 * the best uberblock and then we can actually access 1128 * the contents of the pool. 1129 */ 1130 upbuf = zfs_alloc(VDEV_UBERBLOCK_SIZE(vdev)); 1131 up = (const struct uberblock *)upbuf; 1132 for (l = 0; l < VDEV_LABELS; l++) { 1133 for (i = 0; i < VDEV_UBERBLOCK_COUNT(vdev); i++) { 1134 off = vdev_label_offset(psize, l, 1135 VDEV_UBERBLOCK_OFFSET(vdev, i)); 1136 BP_ZERO(&bp); 1137 DVA_SET_OFFSET(&bp.blk_dva[0], off); 1138 BP_SET_LSIZE(&bp, VDEV_UBERBLOCK_SIZE(vdev)); 1139 BP_SET_PSIZE(&bp, VDEV_UBERBLOCK_SIZE(vdev)); 1140 BP_SET_CHECKSUM(&bp, ZIO_CHECKSUM_LABEL); 1141 BP_SET_COMPRESS(&bp, ZIO_COMPRESS_OFF); 1142 ZIO_SET_CHECKSUM(&bp.blk_cksum, off, 0, 0, 0); 1143 1144 if (vdev_read_phys(vdev, &bp, upbuf, off, 0)) 1145 continue; 1146 1147 if (up->ub_magic != UBERBLOCK_MAGIC) 1148 continue; 1149 if (up->ub_txg < spa->spa_txg) 1150 continue; 1151 if (up->ub_txg > spa->spa_uberblock.ub_txg || 1152 (up->ub_txg == spa->spa_uberblock.ub_txg && 1153 up->ub_timestamp > 1154 spa->spa_uberblock.ub_timestamp)) { 1155 spa->spa_uberblock = *up; 1156 } 1157 } 1158 } 1159 zfs_free(upbuf, VDEV_UBERBLOCK_SIZE(vdev)); 1160 1161 vdev->spa = spa; 1162 if (spap != NULL) 1163 *spap = spa; 1164 return (0); 1165} 1166 1167static int 1168ilog2(int n) 1169{ 1170 int v; 1171 1172 for (v = 0; v < 32; v++) 1173 if (n == (1 << v)) 1174 return v; 1175 return -1; 1176} 1177 1178static int 1179zio_read_gang(const spa_t *spa, const blkptr_t *bp, void *buf) 1180{ 1181 blkptr_t gbh_bp; 1182 zio_gbh_phys_t zio_gb; 1183 char *pbuf; 1184 int i; 1185 1186 /* Artificial BP for gang block header. */ 1187 gbh_bp = *bp; 1188 BP_SET_PSIZE(&gbh_bp, SPA_GANGBLOCKSIZE); 1189 BP_SET_LSIZE(&gbh_bp, SPA_GANGBLOCKSIZE); 1190 BP_SET_CHECKSUM(&gbh_bp, ZIO_CHECKSUM_GANG_HEADER); 1191 BP_SET_COMPRESS(&gbh_bp, ZIO_COMPRESS_OFF); 1192 for (i = 0; i < SPA_DVAS_PER_BP; i++) 1193 DVA_SET_GANG(&gbh_bp.blk_dva[i], 0); 1194 1195 /* Read gang header block using the artificial BP. */ 1196 if (zio_read(spa, &gbh_bp, &zio_gb)) 1197 return (EIO); 1198 1199 pbuf = buf; 1200 for (i = 0; i < SPA_GBH_NBLKPTRS; i++) { 1201 blkptr_t *gbp = &zio_gb.zg_blkptr[i]; 1202 1203 if (BP_IS_HOLE(gbp)) 1204 continue; 1205 if (zio_read(spa, gbp, pbuf)) 1206 return (EIO); 1207 pbuf += BP_GET_PSIZE(gbp); 1208 } 1209 1210 if (zio_checksum_verify(spa, bp, buf)) 1211 return (EIO); 1212 return (0); 1213} 1214 1215static int 1216zio_read(const spa_t *spa, const blkptr_t *bp, void *buf) 1217{ 1218 int cpfunc = BP_GET_COMPRESS(bp); 1219 uint64_t align, size; 1220 void *pbuf; 1221 int i, error; 1222 1223 /* 1224 * Process data embedded in block pointer 1225 */ 1226 if (BP_IS_EMBEDDED(bp)) { 1227 ASSERT(BPE_GET_ETYPE(bp) == BP_EMBEDDED_TYPE_DATA); 1228 1229 size = BPE_GET_PSIZE(bp); 1230 ASSERT(size <= BPE_PAYLOAD_SIZE); 1231 1232 if (cpfunc != ZIO_COMPRESS_OFF) 1233 pbuf = zfs_alloc(size); 1234 else 1235 pbuf = buf; 1236 1237 decode_embedded_bp_compressed(bp, pbuf); 1238 error = 0; 1239 1240 if (cpfunc != ZIO_COMPRESS_OFF) { 1241 error = zio_decompress_data(cpfunc, pbuf, 1242 size, buf, BP_GET_LSIZE(bp)); 1243 zfs_free(pbuf, size); 1244 } 1245 if (error != 0) 1246 printf("ZFS: i/o error - unable to decompress block pointer data, error %d\n", 1247 error); 1248 return (error); 1249 } 1250 1251 error = EIO; 1252 1253 for (i = 0; i < SPA_DVAS_PER_BP; i++) { 1254 const dva_t *dva = &bp->blk_dva[i]; 1255 vdev_t *vdev; 1256 int vdevid; 1257 off_t offset; 1258 1259 if (!dva->dva_word[0] && !dva->dva_word[1]) 1260 continue; 1261 1262 vdevid = DVA_GET_VDEV(dva); 1263 offset = DVA_GET_OFFSET(dva); 1264 STAILQ_FOREACH(vdev, &spa->spa_vdevs, v_childlink) { 1265 if (vdev->v_id == vdevid) 1266 break; 1267 } 1268 if (!vdev || !vdev->v_read) 1269 continue; 1270 1271 size = BP_GET_PSIZE(bp); 1272 if (vdev->v_read == vdev_raidz_read) { 1273 align = 1ULL << vdev->v_top->v_ashift; 1274 if (P2PHASE(size, align) != 0) 1275 size = P2ROUNDUP(size, align); 1276 } 1277 if (size != BP_GET_PSIZE(bp) || cpfunc != ZIO_COMPRESS_OFF) 1278 pbuf = zfs_alloc(size); 1279 else 1280 pbuf = buf; 1281 1282 if (DVA_GET_GANG(dva)) 1283 error = zio_read_gang(spa, bp, pbuf); 1284 else 1285 error = vdev->v_read(vdev, bp, pbuf, offset, size); 1286 if (error == 0) { 1287 if (cpfunc != ZIO_COMPRESS_OFF) 1288 error = zio_decompress_data(cpfunc, pbuf, 1289 BP_GET_PSIZE(bp), buf, BP_GET_LSIZE(bp)); 1290 else if (size != BP_GET_PSIZE(bp)) 1291 bcopy(pbuf, buf, BP_GET_PSIZE(bp)); 1292 } 1293 if (buf != pbuf) 1294 zfs_free(pbuf, size); 1295 if (error == 0) 1296 break; 1297 } 1298 if (error != 0) 1299 printf("ZFS: i/o error - all block copies unavailable\n"); 1300 return (error); 1301} 1302 1303static int 1304dnode_read(const spa_t *spa, const dnode_phys_t *dnode, off_t offset, void *buf, size_t buflen) 1305{ 1306 int ibshift = dnode->dn_indblkshift - SPA_BLKPTRSHIFT; 1307 int bsize = dnode->dn_datablkszsec << SPA_MINBLOCKSHIFT; 1308 int nlevels = dnode->dn_nlevels; 1309 int i, rc; 1310 1311 if (bsize > SPA_MAXBLOCKSIZE) { 1312 printf("ZFS: I/O error - blocks larger than %llu are not " 1313 "supported\n", SPA_MAXBLOCKSIZE); 1314 return (EIO); 1315 } 1316 1317 /* 1318 * Note: bsize may not be a power of two here so we need to do an 1319 * actual divide rather than a bitshift. 1320 */ 1321 while (buflen > 0) { 1322 uint64_t bn = offset / bsize; 1323 int boff = offset % bsize; 1324 int ibn; 1325 const blkptr_t *indbp; 1326 blkptr_t bp; 1327 1328 if (bn > dnode->dn_maxblkid) 1329 return (EIO); 1330 1331 if (dnode == dnode_cache_obj && bn == dnode_cache_bn) 1332 goto cached; 1333 1334 indbp = dnode->dn_blkptr; 1335 for (i = 0; i < nlevels; i++) { 1336 /* 1337 * Copy the bp from the indirect array so that 1338 * we can re-use the scratch buffer for multi-level 1339 * objects. 1340 */ 1341 ibn = bn >> ((nlevels - i - 1) * ibshift); 1342 ibn &= ((1 << ibshift) - 1); 1343 bp = indbp[ibn]; 1344 if (BP_IS_HOLE(&bp)) { 1345 memset(dnode_cache_buf, 0, bsize); 1346 break; 1347 } 1348 rc = zio_read(spa, &bp, dnode_cache_buf); 1349 if (rc) 1350 return (rc); 1351 indbp = (const blkptr_t *) dnode_cache_buf; 1352 } 1353 dnode_cache_obj = dnode; 1354 dnode_cache_bn = bn; 1355 cached: 1356 1357 /* 1358 * The buffer contains our data block. Copy what we 1359 * need from it and loop. 1360 */ 1361 i = bsize - boff; 1362 if (i > buflen) i = buflen; 1363 memcpy(buf, &dnode_cache_buf[boff], i); 1364 buf = ((char*) buf) + i; 1365 offset += i; 1366 buflen -= i; 1367 } 1368 1369 return (0); 1370} 1371 1372/* 1373 * Lookup a value in a microzap directory. Assumes that the zap 1374 * scratch buffer contains the directory contents. 1375 */ 1376static int 1377mzap_lookup(const dnode_phys_t *dnode, const char *name, uint64_t *value) 1378{ 1379 const mzap_phys_t *mz; 1380 const mzap_ent_phys_t *mze; 1381 size_t size; 1382 int chunks, i; 1383 1384 /* 1385 * Microzap objects use exactly one block. Read the whole 1386 * thing. 1387 */ 1388 size = dnode->dn_datablkszsec * 512; 1389 1390 mz = (const mzap_phys_t *) zap_scratch; 1391 chunks = size / MZAP_ENT_LEN - 1; 1392 1393 for (i = 0; i < chunks; i++) { 1394 mze = &mz->mz_chunk[i]; 1395 if (!strcmp(mze->mze_name, name)) { 1396 *value = mze->mze_value; 1397 return (0); 1398 } 1399 } 1400 1401 return (ENOENT); 1402} 1403 1404/* 1405 * Compare a name with a zap leaf entry. Return non-zero if the name 1406 * matches. 1407 */ 1408static int 1409fzap_name_equal(const zap_leaf_t *zl, const zap_leaf_chunk_t *zc, const char *name) 1410{ 1411 size_t namelen; 1412 const zap_leaf_chunk_t *nc; 1413 const char *p; 1414 1415 namelen = zc->l_entry.le_name_numints; 1416 1417 nc = &ZAP_LEAF_CHUNK(zl, zc->l_entry.le_name_chunk); 1418 p = name; 1419 while (namelen > 0) { 1420 size_t len; 1421 len = namelen; 1422 if (len > ZAP_LEAF_ARRAY_BYTES) 1423 len = ZAP_LEAF_ARRAY_BYTES; 1424 if (memcmp(p, nc->l_array.la_array, len)) 1425 return (0); 1426 p += len; 1427 namelen -= len; 1428 nc = &ZAP_LEAF_CHUNK(zl, nc->l_array.la_next); 1429 } 1430 1431 return 1; 1432} 1433 1434/* 1435 * Extract a uint64_t value from a zap leaf entry. 1436 */ 1437static uint64_t 1438fzap_leaf_value(const zap_leaf_t *zl, const zap_leaf_chunk_t *zc) 1439{ 1440 const zap_leaf_chunk_t *vc; 1441 int i; 1442 uint64_t value; 1443 const uint8_t *p; 1444 1445 vc = &ZAP_LEAF_CHUNK(zl, zc->l_entry.le_value_chunk); 1446 for (i = 0, value = 0, p = vc->l_array.la_array; i < 8; i++) { 1447 value = (value << 8) | p[i]; 1448 } 1449 1450 return value; 1451} 1452 1453static void 1454stv(int len, void *addr, uint64_t value) 1455{ 1456 switch (len) { 1457 case 1: 1458 *(uint8_t *)addr = value; 1459 return; 1460 case 2: 1461 *(uint16_t *)addr = value; 1462 return; 1463 case 4: 1464 *(uint32_t *)addr = value; 1465 return; 1466 case 8: 1467 *(uint64_t *)addr = value; 1468 return; 1469 } 1470} 1471 1472/* 1473 * Extract a array from a zap leaf entry. 1474 */ 1475static void 1476fzap_leaf_array(const zap_leaf_t *zl, const zap_leaf_chunk_t *zc, 1477 uint64_t integer_size, uint64_t num_integers, void *buf) 1478{ 1479 uint64_t array_int_len = zc->l_entry.le_value_intlen; 1480 uint64_t value = 0; 1481 uint64_t *u64 = buf; 1482 char *p = buf; 1483 int len = MIN(zc->l_entry.le_value_numints, num_integers); 1484 int chunk = zc->l_entry.le_value_chunk; 1485 int byten = 0; 1486 1487 if (integer_size == 8 && len == 1) { 1488 *u64 = fzap_leaf_value(zl, zc); 1489 return; 1490 } 1491 1492 while (len > 0) { 1493 struct zap_leaf_array *la = &ZAP_LEAF_CHUNK(zl, chunk).l_array; 1494 int i; 1495 1496 ASSERT3U(chunk, <, ZAP_LEAF_NUMCHUNKS(zl)); 1497 for (i = 0; i < ZAP_LEAF_ARRAY_BYTES && len > 0; i++) { 1498 value = (value << 8) | la->la_array[i]; 1499 byten++; 1500 if (byten == array_int_len) { 1501 stv(integer_size, p, value); 1502 byten = 0; 1503 len--; 1504 if (len == 0) 1505 return; 1506 p += integer_size; 1507 } 1508 } 1509 chunk = la->la_next; 1510 } 1511} 1512 1513/* 1514 * Lookup a value in a fatzap directory. Assumes that the zap scratch 1515 * buffer contains the directory header. 1516 */ 1517static int 1518fzap_lookup(const spa_t *spa, const dnode_phys_t *dnode, const char *name, 1519 uint64_t integer_size, uint64_t num_integers, void *value) 1520{ 1521 int bsize = dnode->dn_datablkszsec << SPA_MINBLOCKSHIFT; 1522 zap_phys_t zh = *(zap_phys_t *) zap_scratch; 1523 fat_zap_t z; 1524 uint64_t *ptrtbl; 1525 uint64_t hash; 1526 int rc; 1527 1528 if (zh.zap_magic != ZAP_MAGIC) 1529 return (EIO); 1530 1531 z.zap_block_shift = ilog2(bsize); 1532 z.zap_phys = (zap_phys_t *) zap_scratch; 1533 1534 /* 1535 * Figure out where the pointer table is and read it in if necessary. 1536 */ 1537 if (zh.zap_ptrtbl.zt_blk) { 1538 rc = dnode_read(spa, dnode, zh.zap_ptrtbl.zt_blk * bsize, 1539 zap_scratch, bsize); 1540 if (rc) 1541 return (rc); 1542 ptrtbl = (uint64_t *) zap_scratch; 1543 } else { 1544 ptrtbl = &ZAP_EMBEDDED_PTRTBL_ENT(&z, 0); 1545 } 1546 1547 hash = zap_hash(zh.zap_salt, name); 1548 1549 zap_leaf_t zl; 1550 zl.l_bs = z.zap_block_shift; 1551 1552 off_t off = ptrtbl[hash >> (64 - zh.zap_ptrtbl.zt_shift)] << zl.l_bs; 1553 zap_leaf_chunk_t *zc; 1554 1555 rc = dnode_read(spa, dnode, off, zap_scratch, bsize); 1556 if (rc) 1557 return (rc); 1558 1559 zl.l_phys = (zap_leaf_phys_t *) zap_scratch; 1560 1561 /* 1562 * Make sure this chunk matches our hash. 1563 */ 1564 if (zl.l_phys->l_hdr.lh_prefix_len > 0 1565 && zl.l_phys->l_hdr.lh_prefix 1566 != hash >> (64 - zl.l_phys->l_hdr.lh_prefix_len)) 1567 return (ENOENT); 1568 1569 /* 1570 * Hash within the chunk to find our entry. 1571 */ 1572 int shift = (64 - ZAP_LEAF_HASH_SHIFT(&zl) - zl.l_phys->l_hdr.lh_prefix_len); 1573 int h = (hash >> shift) & ((1 << ZAP_LEAF_HASH_SHIFT(&zl)) - 1); 1574 h = zl.l_phys->l_hash[h]; 1575 if (h == 0xffff) 1576 return (ENOENT); 1577 zc = &ZAP_LEAF_CHUNK(&zl, h); 1578 while (zc->l_entry.le_hash != hash) { 1579 if (zc->l_entry.le_next == 0xffff) { 1580 zc = NULL; 1581 break; 1582 } 1583 zc = &ZAP_LEAF_CHUNK(&zl, zc->l_entry.le_next); 1584 } 1585 if (fzap_name_equal(&zl, zc, name)) { 1586 if (zc->l_entry.le_value_intlen * zc->l_entry.le_value_numints > 1587 integer_size * num_integers) 1588 return (E2BIG); 1589 fzap_leaf_array(&zl, zc, integer_size, num_integers, value); 1590 return (0); 1591 } 1592 1593 return (ENOENT); 1594} 1595 1596/* 1597 * Lookup a name in a zap object and return its value as a uint64_t. 1598 */ 1599static int 1600zap_lookup(const spa_t *spa, const dnode_phys_t *dnode, const char *name, 1601 uint64_t integer_size, uint64_t num_integers, void *value) 1602{ 1603 int rc; 1604 uint64_t zap_type; 1605 size_t size = dnode->dn_datablkszsec << SPA_MINBLOCKSHIFT; 1606 1607 rc = dnode_read(spa, dnode, 0, zap_scratch, size); 1608 if (rc) 1609 return (rc); 1610 1611 zap_type = *(uint64_t *) zap_scratch; 1612 if (zap_type == ZBT_MICRO) 1613 return mzap_lookup(dnode, name, value); 1614 else if (zap_type == ZBT_HEADER) { 1615 return fzap_lookup(spa, dnode, name, integer_size, 1616 num_integers, value); 1617 } 1618 printf("ZFS: invalid zap_type=%d\n", (int)zap_type); 1619 return (EIO); 1620} 1621 1622/* 1623 * List a microzap directory. Assumes that the zap scratch buffer contains 1624 * the directory contents. 1625 */ 1626static int 1627mzap_list(const dnode_phys_t *dnode, int (*callback)(const char *, uint64_t)) 1628{ 1629 const mzap_phys_t *mz; 1630 const mzap_ent_phys_t *mze; 1631 size_t size; 1632 int chunks, i, rc; 1633 1634 /* 1635 * Microzap objects use exactly one block. Read the whole 1636 * thing. 1637 */ 1638 size = dnode->dn_datablkszsec * 512; 1639 mz = (const mzap_phys_t *) zap_scratch; 1640 chunks = size / MZAP_ENT_LEN - 1; 1641 1642 for (i = 0; i < chunks; i++) { 1643 mze = &mz->mz_chunk[i]; 1644 if (mze->mze_name[0]) { 1645 rc = callback(mze->mze_name, mze->mze_value); 1646 if (rc != 0) 1647 return (rc); 1648 } 1649 } 1650 1651 return (0); 1652} 1653 1654/* 1655 * List a fatzap directory. Assumes that the zap scratch buffer contains 1656 * the directory header. 1657 */ 1658static int 1659fzap_list(const spa_t *spa, const dnode_phys_t *dnode, int (*callback)(const char *, uint64_t)) 1660{ 1661 int bsize = dnode->dn_datablkszsec << SPA_MINBLOCKSHIFT; 1662 zap_phys_t zh = *(zap_phys_t *) zap_scratch; 1663 fat_zap_t z; 1664 int i, j, rc; 1665 1666 if (zh.zap_magic != ZAP_MAGIC) 1667 return (EIO); 1668 1669 z.zap_block_shift = ilog2(bsize); 1670 z.zap_phys = (zap_phys_t *) zap_scratch; 1671 1672 /* 1673 * This assumes that the leaf blocks start at block 1. The 1674 * documentation isn't exactly clear on this. 1675 */ 1676 zap_leaf_t zl; 1677 zl.l_bs = z.zap_block_shift; 1678 for (i = 0; i < zh.zap_num_leafs; i++) { 1679 off_t off = (i + 1) << zl.l_bs; 1680 char name[256], *p; 1681 uint64_t value; 1682 1683 if (dnode_read(spa, dnode, off, zap_scratch, bsize)) 1684 return (EIO); 1685 1686 zl.l_phys = (zap_leaf_phys_t *) zap_scratch; 1687 1688 for (j = 0; j < ZAP_LEAF_NUMCHUNKS(&zl); j++) { 1689 zap_leaf_chunk_t *zc, *nc; 1690 int namelen; 1691 1692 zc = &ZAP_LEAF_CHUNK(&zl, j); 1693 if (zc->l_entry.le_type != ZAP_CHUNK_ENTRY) 1694 continue; 1695 namelen = zc->l_entry.le_name_numints; 1696 if (namelen > sizeof(name)) 1697 namelen = sizeof(name); 1698 1699 /* 1700 * Paste the name back together. 1701 */ 1702 nc = &ZAP_LEAF_CHUNK(&zl, zc->l_entry.le_name_chunk); 1703 p = name; 1704 while (namelen > 0) { 1705 int len; 1706 len = namelen; 1707 if (len > ZAP_LEAF_ARRAY_BYTES) 1708 len = ZAP_LEAF_ARRAY_BYTES; 1709 memcpy(p, nc->l_array.la_array, len); 1710 p += len; 1711 namelen -= len; 1712 nc = &ZAP_LEAF_CHUNK(&zl, nc->l_array.la_next); 1713 } 1714 1715 /* 1716 * Assume the first eight bytes of the value are 1717 * a uint64_t. 1718 */ 1719 value = fzap_leaf_value(&zl, zc); 1720 1721 //printf("%s 0x%jx\n", name, (uintmax_t)value); 1722 rc = callback((const char *)name, value); 1723 if (rc != 0) 1724 return (rc); 1725 } 1726 } 1727 1728 return (0); 1729} 1730 1731static int zfs_printf(const char *name, uint64_t value __unused) 1732{ 1733 1734 printf("%s\n", name); 1735 1736 return (0); 1737} 1738 1739/* 1740 * List a zap directory. 1741 */ 1742static int 1743zap_list(const spa_t *spa, const dnode_phys_t *dnode) 1744{ 1745 uint64_t zap_type; 1746 size_t size = dnode->dn_datablkszsec * 512; 1747 1748 if (dnode_read(spa, dnode, 0, zap_scratch, size)) 1749 return (EIO); 1750 1751 zap_type = *(uint64_t *) zap_scratch; 1752 if (zap_type == ZBT_MICRO) 1753 return mzap_list(dnode, zfs_printf); 1754 else 1755 return fzap_list(spa, dnode, zfs_printf); 1756} 1757 1758static int 1759objset_get_dnode(const spa_t *spa, const objset_phys_t *os, uint64_t objnum, dnode_phys_t *dnode) 1760{ 1761 off_t offset; 1762 1763 offset = objnum * sizeof(dnode_phys_t); 1764 return dnode_read(spa, &os->os_meta_dnode, offset, 1765 dnode, sizeof(dnode_phys_t)); 1766} 1767 1768static int 1769mzap_rlookup(const spa_t *spa, const dnode_phys_t *dnode, char *name, uint64_t value) 1770{ 1771 const mzap_phys_t *mz; 1772 const mzap_ent_phys_t *mze; 1773 size_t size; 1774 int chunks, i; 1775 1776 /* 1777 * Microzap objects use exactly one block. Read the whole 1778 * thing. 1779 */ 1780 size = dnode->dn_datablkszsec * 512; 1781 1782 mz = (const mzap_phys_t *) zap_scratch; 1783 chunks = size / MZAP_ENT_LEN - 1; 1784 1785 for (i = 0; i < chunks; i++) { 1786 mze = &mz->mz_chunk[i]; 1787 if (value == mze->mze_value) { 1788 strcpy(name, mze->mze_name); 1789 return (0); 1790 } 1791 } 1792 1793 return (ENOENT); 1794} 1795 1796static void 1797fzap_name_copy(const zap_leaf_t *zl, const zap_leaf_chunk_t *zc, char *name) 1798{ 1799 size_t namelen; 1800 const zap_leaf_chunk_t *nc; 1801 char *p; 1802 1803 namelen = zc->l_entry.le_name_numints; 1804 1805 nc = &ZAP_LEAF_CHUNK(zl, zc->l_entry.le_name_chunk); 1806 p = name; 1807 while (namelen > 0) { 1808 size_t len; 1809 len = namelen; 1810 if (len > ZAP_LEAF_ARRAY_BYTES) 1811 len = ZAP_LEAF_ARRAY_BYTES; 1812 memcpy(p, nc->l_array.la_array, len); 1813 p += len; 1814 namelen -= len; 1815 nc = &ZAP_LEAF_CHUNK(zl, nc->l_array.la_next); 1816 } 1817 1818 *p = '\0'; 1819} 1820 1821static int 1822fzap_rlookup(const spa_t *spa, const dnode_phys_t *dnode, char *name, uint64_t value) 1823{ 1824 int bsize = dnode->dn_datablkszsec << SPA_MINBLOCKSHIFT; 1825 zap_phys_t zh = *(zap_phys_t *) zap_scratch; 1826 fat_zap_t z; 1827 int i, j; 1828 1829 if (zh.zap_magic != ZAP_MAGIC) 1830 return (EIO); 1831 1832 z.zap_block_shift = ilog2(bsize); 1833 z.zap_phys = (zap_phys_t *) zap_scratch; 1834 1835 /* 1836 * This assumes that the leaf blocks start at block 1. The 1837 * documentation isn't exactly clear on this. 1838 */ 1839 zap_leaf_t zl; 1840 zl.l_bs = z.zap_block_shift; 1841 for (i = 0; i < zh.zap_num_leafs; i++) { 1842 off_t off = (i + 1) << zl.l_bs; 1843 1844 if (dnode_read(spa, dnode, off, zap_scratch, bsize)) 1845 return (EIO); 1846 1847 zl.l_phys = (zap_leaf_phys_t *) zap_scratch; 1848 1849 for (j = 0; j < ZAP_LEAF_NUMCHUNKS(&zl); j++) { 1850 zap_leaf_chunk_t *zc; 1851 1852 zc = &ZAP_LEAF_CHUNK(&zl, j); 1853 if (zc->l_entry.le_type != ZAP_CHUNK_ENTRY) 1854 continue; 1855 if (zc->l_entry.le_value_intlen != 8 || 1856 zc->l_entry.le_value_numints != 1) 1857 continue; 1858 1859 if (fzap_leaf_value(&zl, zc) == value) { 1860 fzap_name_copy(&zl, zc, name); 1861 return (0); 1862 } 1863 } 1864 } 1865 1866 return (ENOENT); 1867} 1868 1869static int 1870zap_rlookup(const spa_t *spa, const dnode_phys_t *dnode, char *name, uint64_t value) 1871{ 1872 int rc; 1873 uint64_t zap_type; 1874 size_t size = dnode->dn_datablkszsec * 512; 1875 1876 rc = dnode_read(spa, dnode, 0, zap_scratch, size); 1877 if (rc) 1878 return (rc); 1879 1880 zap_type = *(uint64_t *) zap_scratch; 1881 if (zap_type == ZBT_MICRO) 1882 return mzap_rlookup(spa, dnode, name, value); 1883 else 1884 return fzap_rlookup(spa, dnode, name, value); 1885} 1886 1887static int 1888zfs_rlookup(const spa_t *spa, uint64_t objnum, char *result) 1889{ 1890 char name[256]; 1891 char component[256]; 1892 uint64_t dir_obj, parent_obj, child_dir_zapobj; 1893 dnode_phys_t child_dir_zap, dataset, dir, parent; 1894 dsl_dir_phys_t *dd; 1895 dsl_dataset_phys_t *ds; 1896 char *p; 1897 int len; 1898 1899 p = &name[sizeof(name) - 1]; 1900 *p = '\0'; 1901 1902 if (objset_get_dnode(spa, &spa->spa_mos, objnum, &dataset)) { 1903 printf("ZFS: can't find dataset %ju\n", (uintmax_t)objnum); 1904 return (EIO); 1905 } 1906 ds = (dsl_dataset_phys_t *)&dataset.dn_bonus; 1907 dir_obj = ds->ds_dir_obj; 1908 1909 for (;;) { 1910 if (objset_get_dnode(spa, &spa->spa_mos, dir_obj, &dir) != 0) 1911 return (EIO); 1912 dd = (dsl_dir_phys_t *)&dir.dn_bonus; 1913 1914 /* Actual loop condition. */ 1915 parent_obj = dd->dd_parent_obj; 1916 if (parent_obj == 0) 1917 break; 1918 1919 if (objset_get_dnode(spa, &spa->spa_mos, parent_obj, &parent) != 0) 1920 return (EIO); 1921 dd = (dsl_dir_phys_t *)&parent.dn_bonus; 1922 child_dir_zapobj = dd->dd_child_dir_zapobj; 1923 if (objset_get_dnode(spa, &spa->spa_mos, child_dir_zapobj, &child_dir_zap) != 0) 1924 return (EIO); 1925 if (zap_rlookup(spa, &child_dir_zap, component, dir_obj) != 0) 1926 return (EIO); 1927 1928 len = strlen(component); 1929 p -= len; 1930 memcpy(p, component, len); 1931 --p; 1932 *p = '/'; 1933 1934 /* Actual loop iteration. */ 1935 dir_obj = parent_obj; 1936 } 1937 1938 if (*p != '\0') 1939 ++p; 1940 strcpy(result, p); 1941 1942 return (0); 1943} 1944 1945static int 1946zfs_lookup_dataset(const spa_t *spa, const char *name, uint64_t *objnum) 1947{ 1948 char element[256]; 1949 uint64_t dir_obj, child_dir_zapobj; 1950 dnode_phys_t child_dir_zap, dir; 1951 dsl_dir_phys_t *dd; 1952 const char *p, *q; 1953 1954 if (objset_get_dnode(spa, &spa->spa_mos, DMU_POOL_DIRECTORY_OBJECT, &dir)) 1955 return (EIO); 1956 if (zap_lookup(spa, &dir, DMU_POOL_ROOT_DATASET, sizeof (dir_obj), 1957 1, &dir_obj)) 1958 return (EIO); 1959 1960 p = name; 1961 for (;;) { 1962 if (objset_get_dnode(spa, &spa->spa_mos, dir_obj, &dir)) 1963 return (EIO); 1964 dd = (dsl_dir_phys_t *)&dir.dn_bonus; 1965 1966 while (*p == '/') 1967 p++; 1968 /* Actual loop condition #1. */ 1969 if (*p == '\0') 1970 break; 1971 1972 q = strchr(p, '/'); 1973 if (q) { 1974 memcpy(element, p, q - p); 1975 element[q - p] = '\0'; 1976 p = q + 1; 1977 } else { 1978 strcpy(element, p); 1979 p += strlen(p); 1980 } 1981 1982 child_dir_zapobj = dd->dd_child_dir_zapobj; 1983 if (objset_get_dnode(spa, &spa->spa_mos, child_dir_zapobj, &child_dir_zap) != 0) 1984 return (EIO); 1985 1986 /* Actual loop condition #2. */ 1987 if (zap_lookup(spa, &child_dir_zap, element, sizeof (dir_obj), 1988 1, &dir_obj) != 0) 1989 return (ENOENT); 1990 } 1991 1992 *objnum = dd->dd_head_dataset_obj; 1993 return (0); 1994} 1995 1996#ifndef BOOT2 1997static int 1998zfs_list_dataset(const spa_t *spa, uint64_t objnum/*, int pos, char *entry*/) 1999{ 2000 uint64_t dir_obj, child_dir_zapobj; 2001 dnode_phys_t child_dir_zap, dir, dataset; 2002 dsl_dataset_phys_t *ds; 2003 dsl_dir_phys_t *dd; 2004 2005 if (objset_get_dnode(spa, &spa->spa_mos, objnum, &dataset)) { 2006 printf("ZFS: can't find dataset %ju\n", (uintmax_t)objnum); 2007 return (EIO); 2008 } 2009 ds = (dsl_dataset_phys_t *) &dataset.dn_bonus; 2010 dir_obj = ds->ds_dir_obj; 2011 2012 if (objset_get_dnode(spa, &spa->spa_mos, dir_obj, &dir)) { 2013 printf("ZFS: can't find dirobj %ju\n", (uintmax_t)dir_obj); 2014 return (EIO); 2015 } 2016 dd = (dsl_dir_phys_t *)&dir.dn_bonus; 2017 2018 child_dir_zapobj = dd->dd_child_dir_zapobj; 2019 if (objset_get_dnode(spa, &spa->spa_mos, child_dir_zapobj, &child_dir_zap) != 0) { 2020 printf("ZFS: can't find child zap %ju\n", (uintmax_t)dir_obj); 2021 return (EIO); 2022 } 2023 2024 return (zap_list(spa, &child_dir_zap) != 0); 2025} 2026 2027int 2028zfs_callback_dataset(const spa_t *spa, uint64_t objnum, int (*callback)(const char *, uint64_t)) 2029{ 2030 uint64_t dir_obj, child_dir_zapobj, zap_type; 2031 dnode_phys_t child_dir_zap, dir, dataset; 2032 dsl_dataset_phys_t *ds; 2033 dsl_dir_phys_t *dd; 2034 int err; 2035 2036 err = objset_get_dnode(spa, &spa->spa_mos, objnum, &dataset); 2037 if (err != 0) { 2038 printf("ZFS: can't find dataset %ju\n", (uintmax_t)objnum); 2039 return (err); 2040 } 2041 ds = (dsl_dataset_phys_t *) &dataset.dn_bonus; 2042 dir_obj = ds->ds_dir_obj; 2043 2044 err = objset_get_dnode(spa, &spa->spa_mos, dir_obj, &dir); 2045 if (err != 0) { 2046 printf("ZFS: can't find dirobj %ju\n", (uintmax_t)dir_obj); 2047 return (err); 2048 } 2049 dd = (dsl_dir_phys_t *)&dir.dn_bonus; 2050 2051 child_dir_zapobj = dd->dd_child_dir_zapobj; 2052 err = objset_get_dnode(spa, &spa->spa_mos, child_dir_zapobj, &child_dir_zap); 2053 if (err != 0) { 2054 printf("ZFS: can't find child zap %ju\n", (uintmax_t)dir_obj); 2055 return (err); 2056 } 2057 2058 err = dnode_read(spa, &child_dir_zap, 0, zap_scratch, child_dir_zap.dn_datablkszsec * 512); 2059 if (err != 0) 2060 return (err); 2061 2062 zap_type = *(uint64_t *) zap_scratch; 2063 if (zap_type == ZBT_MICRO) 2064 return mzap_list(&child_dir_zap, callback); 2065 else 2066 return fzap_list(spa, &child_dir_zap, callback); 2067} 2068#endif 2069 2070/* 2071 * Find the object set given the object number of its dataset object 2072 * and return its details in *objset 2073 */ 2074static int 2075zfs_mount_dataset(const spa_t *spa, uint64_t objnum, objset_phys_t *objset) 2076{ 2077 dnode_phys_t dataset; 2078 dsl_dataset_phys_t *ds; 2079 2080 if (objset_get_dnode(spa, &spa->spa_mos, objnum, &dataset)) { 2081 printf("ZFS: can't find dataset %ju\n", (uintmax_t)objnum); 2082 return (EIO); 2083 } 2084 2085 ds = (dsl_dataset_phys_t *) &dataset.dn_bonus; 2086 if (zio_read(spa, &ds->ds_bp, objset)) { 2087 printf("ZFS: can't read object set for dataset %ju\n", 2088 (uintmax_t)objnum); 2089 return (EIO); 2090 } 2091 2092 return (0); 2093} 2094 2095/* 2096 * Find the object set pointed to by the BOOTFS property or the root 2097 * dataset if there is none and return its details in *objset 2098 */ 2099static int 2100zfs_get_root(const spa_t *spa, uint64_t *objid) 2101{ 2102 dnode_phys_t dir, propdir; 2103 uint64_t props, bootfs, root; 2104 2105 *objid = 0; 2106 2107 /* 2108 * Start with the MOS directory object. 2109 */ 2110 if (objset_get_dnode(spa, &spa->spa_mos, DMU_POOL_DIRECTORY_OBJECT, &dir)) { 2111 printf("ZFS: can't read MOS object directory\n"); 2112 return (EIO); 2113 } 2114 2115 /* 2116 * Lookup the pool_props and see if we can find a bootfs. 2117 */ 2118 if (zap_lookup(spa, &dir, DMU_POOL_PROPS, sizeof (props), 1, &props) == 0 2119 && objset_get_dnode(spa, &spa->spa_mos, props, &propdir) == 0 2120 && zap_lookup(spa, &propdir, "bootfs", sizeof (bootfs), 1, &bootfs) == 0 2121 && bootfs != 0) 2122 { 2123 *objid = bootfs; 2124 return (0); 2125 } 2126 /* 2127 * Lookup the root dataset directory 2128 */ 2129 if (zap_lookup(spa, &dir, DMU_POOL_ROOT_DATASET, sizeof (root), 1, &root) 2130 || objset_get_dnode(spa, &spa->spa_mos, root, &dir)) { 2131 printf("ZFS: can't find root dsl_dir\n"); 2132 return (EIO); 2133 } 2134 2135 /* 2136 * Use the information from the dataset directory's bonus buffer 2137 * to find the dataset object and from that the object set itself. 2138 */ 2139 dsl_dir_phys_t *dd = (dsl_dir_phys_t *) &dir.dn_bonus; 2140 *objid = dd->dd_head_dataset_obj; 2141 return (0); 2142} 2143 2144static int 2145zfs_mount(const spa_t *spa, uint64_t rootobj, struct zfsmount *mount) 2146{ 2147 2148 mount->spa = spa; 2149 2150 /* 2151 * Find the root object set if not explicitly provided 2152 */ 2153 if (rootobj == 0 && zfs_get_root(spa, &rootobj)) { 2154 printf("ZFS: can't find root filesystem\n"); 2155 return (EIO); 2156 } 2157 2158 if (zfs_mount_dataset(spa, rootobj, &mount->objset)) { 2159 printf("ZFS: can't open root filesystem\n"); 2160 return (EIO); 2161 } 2162 2163 mount->rootobj = rootobj; 2164 2165 return (0); 2166} 2167 2168/* 2169 * callback function for feature name checks. 2170 */ 2171static int 2172check_feature(const char *name, uint64_t value) 2173{ 2174 int i; 2175 2176 if (value == 0) 2177 return (0); 2178 if (name[0] == '\0') 2179 return (0); 2180 2181 for (i = 0; features_for_read[i] != NULL; i++) { 2182 if (strcmp(name, features_for_read[i]) == 0) 2183 return (0); 2184 } 2185 printf("ZFS: unsupported feature: %s\n", name); 2186 return (EIO); 2187} 2188 2189/* 2190 * Checks whether the MOS features that are active are supported. 2191 */ 2192static int 2193check_mos_features(const spa_t *spa) 2194{ 2195 dnode_phys_t dir; 2196 uint64_t objnum, zap_type; 2197 size_t size; 2198 int rc; 2199 2200 if ((rc = objset_get_dnode(spa, &spa->spa_mos, DMU_OT_OBJECT_DIRECTORY, 2201 &dir)) != 0) 2202 return (rc); 2203 if ((rc = zap_lookup(spa, &dir, DMU_POOL_FEATURES_FOR_READ, 2204 sizeof (objnum), 1, &objnum)) != 0) { 2205 /* 2206 * It is older pool without features. As we have already 2207 * tested the label, just return without raising the error. 2208 */ 2209 return (0); 2210 } 2211 2212 if ((rc = objset_get_dnode(spa, &spa->spa_mos, objnum, &dir)) != 0) 2213 return (rc); 2214 2215 if (dir.dn_type != DMU_OTN_ZAP_METADATA) 2216 return (EIO); 2217 2218 size = dir.dn_datablkszsec * 512; 2219 if (dnode_read(spa, &dir, 0, zap_scratch, size)) 2220 return (EIO); 2221 2222 zap_type = *(uint64_t *) zap_scratch; 2223 if (zap_type == ZBT_MICRO) 2224 rc = mzap_list(&dir, check_feature); 2225 else 2226 rc = fzap_list(spa, &dir, check_feature); 2227 2228 return (rc); 2229} 2230 2231static int 2232zfs_spa_init(spa_t *spa) 2233{ 2234 dnode_phys_t dir; 2235 int rc; 2236 2237 if (zio_read(spa, &spa->spa_uberblock.ub_rootbp, &spa->spa_mos)) { 2238 printf("ZFS: can't read MOS of pool %s\n", spa->spa_name); 2239 return (EIO); 2240 } 2241 if (spa->spa_mos.os_type != DMU_OST_META) { 2242 printf("ZFS: corrupted MOS of pool %s\n", spa->spa_name); 2243 return (EIO); 2244 } 2245 2246 if (objset_get_dnode(spa, &spa->spa_mos, DMU_POOL_DIRECTORY_OBJECT, 2247 &dir)) { 2248 printf("ZFS: failed to read pool %s directory object\n", 2249 spa->spa_name); 2250 return (EIO); 2251 } 2252 /* this is allowed to fail, older pools do not have salt */ 2253 rc = zap_lookup(spa, &dir, DMU_POOL_CHECKSUM_SALT, 1, 2254 sizeof (spa->spa_cksum_salt.zcs_bytes), 2255 spa->spa_cksum_salt.zcs_bytes); 2256 2257 rc = check_mos_features(spa); 2258 if (rc != 0) { 2259 printf("ZFS: pool %s is not supported\n", spa->spa_name); 2260 } 2261 2262 return (rc); 2263} 2264 2265static int 2266zfs_dnode_stat(const spa_t *spa, dnode_phys_t *dn, struct stat *sb) 2267{ 2268 2269 if (dn->dn_bonustype != DMU_OT_SA) { 2270 znode_phys_t *zp = (znode_phys_t *)dn->dn_bonus; 2271 2272 sb->st_mode = zp->zp_mode; 2273 sb->st_uid = zp->zp_uid; 2274 sb->st_gid = zp->zp_gid; 2275 sb->st_size = zp->zp_size; 2276 } else { 2277 sa_hdr_phys_t *sahdrp; 2278 int hdrsize; 2279 size_t size = 0; 2280 void *buf = NULL; 2281 2282 if (dn->dn_bonuslen != 0) 2283 sahdrp = (sa_hdr_phys_t *)DN_BONUS(dn); 2284 else { 2285 if ((dn->dn_flags & DNODE_FLAG_SPILL_BLKPTR) != 0) { 2286 blkptr_t *bp = DN_SPILL_BLKPTR(dn); 2287 int error; 2288 2289 size = BP_GET_LSIZE(bp); 2290 buf = zfs_alloc(size); 2291 error = zio_read(spa, bp, buf); 2292 if (error != 0) { 2293 zfs_free(buf, size); 2294 return (error); 2295 } 2296 sahdrp = buf; 2297 } else { 2298 return (EIO); 2299 } 2300 } 2301 hdrsize = SA_HDR_SIZE(sahdrp); 2302 sb->st_mode = *(uint64_t *)((char *)sahdrp + hdrsize + 2303 SA_MODE_OFFSET); 2304 sb->st_uid = *(uint64_t *)((char *)sahdrp + hdrsize + 2305 SA_UID_OFFSET); 2306 sb->st_gid = *(uint64_t *)((char *)sahdrp + hdrsize + 2307 SA_GID_OFFSET); 2308 sb->st_size = *(uint64_t *)((char *)sahdrp + hdrsize + 2309 SA_SIZE_OFFSET); 2310 if (buf != NULL) 2311 zfs_free(buf, size); 2312 } 2313 2314 return (0); 2315} 2316 2317static int 2318zfs_dnode_readlink(const spa_t *spa, dnode_phys_t *dn, char *path, size_t psize) 2319{ 2320 int rc = 0; 2321 2322 if (dn->dn_bonustype == DMU_OT_SA) { 2323 sa_hdr_phys_t *sahdrp = NULL; 2324 size_t size = 0; 2325 void *buf = NULL; 2326 int hdrsize; 2327 char *p; 2328 2329 if (dn->dn_bonuslen != 0) 2330 sahdrp = (sa_hdr_phys_t *)DN_BONUS(dn); 2331 else { 2332 blkptr_t *bp; 2333 2334 if ((dn->dn_flags & DNODE_FLAG_SPILL_BLKPTR) == 0) 2335 return (EIO); 2336 bp = DN_SPILL_BLKPTR(dn); 2337 2338 size = BP_GET_LSIZE(bp); 2339 buf = zfs_alloc(size); 2340 rc = zio_read(spa, bp, buf); 2341 if (rc != 0) { 2342 zfs_free(buf, size); 2343 return (rc); 2344 } 2345 sahdrp = buf; 2346 } 2347 hdrsize = SA_HDR_SIZE(sahdrp); 2348 p = (char *)((uintptr_t)sahdrp + hdrsize + SA_SYMLINK_OFFSET); 2349 memcpy(path, p, psize); 2350 if (buf != NULL) 2351 zfs_free(buf, size); 2352 return (0); 2353 } 2354 /* 2355 * Second test is purely to silence bogus compiler 2356 * warning about accessing past the end of dn_bonus. 2357 */ 2358 if (psize + sizeof(znode_phys_t) <= dn->dn_bonuslen && 2359 sizeof(znode_phys_t) <= sizeof(dn->dn_bonus)) { 2360 memcpy(path, &dn->dn_bonus[sizeof(znode_phys_t)], psize); 2361 } else { 2362 rc = dnode_read(spa, dn, 0, path, psize); 2363 } 2364 return (rc); 2365} 2366 2367struct obj_list { 2368 uint64_t objnum; 2369 STAILQ_ENTRY(obj_list) entry; 2370}; 2371 2372/* 2373 * Lookup a file and return its dnode. 2374 */ 2375static int 2376zfs_lookup(const struct zfsmount *mount, const char *upath, dnode_phys_t *dnode) 2377{ 2378 int rc; 2379 uint64_t objnum; 2380 const spa_t *spa; 2381 dnode_phys_t dn; 2382 const char *p, *q; 2383 char element[256]; 2384 char path[1024]; 2385 int symlinks_followed = 0; 2386 struct stat sb; 2387 struct obj_list *entry, *tentry; 2388 STAILQ_HEAD(, obj_list) on_cache = STAILQ_HEAD_INITIALIZER(on_cache); 2389 2390 spa = mount->spa; 2391 if (mount->objset.os_type != DMU_OST_ZFS) { 2392 printf("ZFS: unexpected object set type %ju\n", 2393 (uintmax_t)mount->objset.os_type); 2394 return (EIO); 2395 } 2396 2397 if ((entry = malloc(sizeof(struct obj_list))) == NULL) 2398 return (ENOMEM); 2399 2400 /* 2401 * Get the root directory dnode. 2402 */ 2403 rc = objset_get_dnode(spa, &mount->objset, MASTER_NODE_OBJ, &dn); 2404 if (rc) { 2405 free(entry); 2406 return (rc); 2407 } 2408 2409 rc = zap_lookup(spa, &dn, ZFS_ROOT_OBJ, sizeof (objnum), 1, &objnum); 2410 if (rc) { 2411 free(entry); 2412 return (rc); 2413 } 2414 entry->objnum = objnum; 2415 STAILQ_INSERT_HEAD(&on_cache, entry, entry); 2416 2417 rc = objset_get_dnode(spa, &mount->objset, objnum, &dn); 2418 if (rc != 0) 2419 goto done; 2420 2421 p = upath; 2422 while (p && *p) { 2423 rc = objset_get_dnode(spa, &mount->objset, objnum, &dn); 2424 if (rc != 0) 2425 goto done; 2426 2427 while (*p == '/') 2428 p++; 2429 if (*p == '\0') 2430 break; 2431 q = p; 2432 while (*q != '\0' && *q != '/') 2433 q++; 2434 2435 /* skip dot */ 2436 if (p + 1 == q && p[0] == '.') { 2437 p++; 2438 continue; 2439 } 2440 /* double dot */ 2441 if (p + 2 == q && p[0] == '.' && p[1] == '.') { 2442 p += 2; 2443 if (STAILQ_FIRST(&on_cache) == 2444 STAILQ_LAST(&on_cache, obj_list, entry)) { 2445 rc = ENOENT; 2446 goto done; 2447 } 2448 entry = STAILQ_FIRST(&on_cache); 2449 STAILQ_REMOVE_HEAD(&on_cache, entry); 2450 free(entry); 2451 objnum = (STAILQ_FIRST(&on_cache))->objnum; 2452 continue; 2453 } 2454 if (q - p + 1 > sizeof(element)) { 2455 rc = ENAMETOOLONG; 2456 goto done; 2457 } 2458 memcpy(element, p, q - p); 2459 element[q - p] = 0; 2460 p = q; 2461 2462 if ((rc = zfs_dnode_stat(spa, &dn, &sb)) != 0) 2463 goto done; 2464 if (!S_ISDIR(sb.st_mode)) { 2465 rc = ENOTDIR; 2466 goto done; 2467 } 2468 2469 rc = zap_lookup(spa, &dn, element, sizeof (objnum), 1, &objnum); 2470 if (rc) 2471 goto done; 2472 objnum = ZFS_DIRENT_OBJ(objnum); 2473 2474 if ((entry = malloc(sizeof(struct obj_list))) == NULL) { 2475 rc = ENOMEM; 2476 goto done; 2477 } 2478 entry->objnum = objnum; 2479 STAILQ_INSERT_HEAD(&on_cache, entry, entry); 2480 rc = objset_get_dnode(spa, &mount->objset, objnum, &dn); 2481 if (rc) 2482 goto done; 2483 2484 /* 2485 * Check for symlink. 2486 */ 2487 rc = zfs_dnode_stat(spa, &dn, &sb); 2488 if (rc) 2489 goto done; 2490 if (S_ISLNK(sb.st_mode)) { 2491 if (symlinks_followed > 10) { 2492 rc = EMLINK; 2493 goto done; 2494 } 2495 symlinks_followed++; 2496 2497 /* 2498 * Read the link value and copy the tail of our 2499 * current path onto the end. 2500 */ 2501 if (sb.st_size + strlen(p) + 1 > sizeof(path)) { 2502 rc = ENAMETOOLONG; 2503 goto done; 2504 } 2505 strcpy(&path[sb.st_size], p); 2506 2507 rc = zfs_dnode_readlink(spa, &dn, path, sb.st_size); 2508 if (rc != 0) 2509 goto done; 2510 2511 /* 2512 * Restart with the new path, starting either at 2513 * the root or at the parent depending whether or 2514 * not the link is relative. 2515 */ 2516 p = path; 2517 if (*p == '/') { 2518 while (STAILQ_FIRST(&on_cache) != 2519 STAILQ_LAST(&on_cache, obj_list, entry)) { 2520 entry = STAILQ_FIRST(&on_cache); 2521 STAILQ_REMOVE_HEAD(&on_cache, entry); 2522 free(entry); 2523 } 2524 } else { 2525 entry = STAILQ_FIRST(&on_cache); 2526 STAILQ_REMOVE_HEAD(&on_cache, entry); 2527 free(entry); 2528 } 2529 objnum = (STAILQ_FIRST(&on_cache))->objnum; 2530 } 2531 } 2532 2533 *dnode = dn; 2534done: 2535 STAILQ_FOREACH_SAFE(entry, &on_cache, entry, tentry) 2536 free(entry); 2537 return (rc); 2538} 2539