dmu_traverse.c revision 290756
1/* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21/* 22 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 23 * Copyright (c) 2012, 2014 by Delphix. All rights reserved. 24 * Copyright (c) 2015 Chunwei Chen. All rights reserved. 25 */ 26 27#include <sys/zfs_context.h> 28#include <sys/dmu_objset.h> 29#include <sys/dmu_traverse.h> 30#include <sys/dsl_dataset.h> 31#include <sys/dsl_dir.h> 32#include <sys/dsl_pool.h> 33#include <sys/dnode.h> 34#include <sys/spa.h> 35#include <sys/zio.h> 36#include <sys/dmu_impl.h> 37#include <sys/sa.h> 38#include <sys/sa_impl.h> 39#include <sys/callb.h> 40#include <sys/zfeature.h> 41 42int32_t zfs_pd_bytes_max = 50 * 1024 * 1024; /* 50MB */ 43 44typedef struct prefetch_data { 45 kmutex_t pd_mtx; 46 kcondvar_t pd_cv; 47 int32_t pd_bytes_fetched; 48 int pd_flags; 49 boolean_t pd_cancel; 50 boolean_t pd_exited; 51 zbookmark_phys_t pd_resume; 52} prefetch_data_t; 53 54typedef struct traverse_data { 55 spa_t *td_spa; 56 uint64_t td_objset; 57 blkptr_t *td_rootbp; 58 uint64_t td_min_txg; 59 zbookmark_phys_t *td_resume; 60 int td_flags; 61 prefetch_data_t *td_pfd; 62 boolean_t td_paused; 63 uint64_t td_hole_birth_enabled_txg; 64 blkptr_cb_t *td_func; 65 void *td_arg; 66} traverse_data_t; 67 68static int traverse_dnode(traverse_data_t *td, const dnode_phys_t *dnp, 69 uint64_t objset, uint64_t object); 70static void prefetch_dnode_metadata(traverse_data_t *td, const dnode_phys_t *, 71 uint64_t objset, uint64_t object); 72 73static int 74traverse_zil_block(zilog_t *zilog, blkptr_t *bp, void *arg, uint64_t claim_txg) 75{ 76 traverse_data_t *td = arg; 77 zbookmark_phys_t zb; 78 79 if (BP_IS_HOLE(bp)) 80 return (0); 81 82 if (claim_txg == 0 && bp->blk_birth >= spa_first_txg(td->td_spa)) 83 return (0); 84 85 SET_BOOKMARK(&zb, td->td_objset, ZB_ZIL_OBJECT, ZB_ZIL_LEVEL, 86 bp->blk_cksum.zc_word[ZIL_ZC_SEQ]); 87 88 (void) td->td_func(td->td_spa, zilog, bp, &zb, NULL, td->td_arg); 89 90 return (0); 91} 92 93static int 94traverse_zil_record(zilog_t *zilog, lr_t *lrc, void *arg, uint64_t claim_txg) 95{ 96 traverse_data_t *td = arg; 97 98 if (lrc->lrc_txtype == TX_WRITE) { 99 lr_write_t *lr = (lr_write_t *)lrc; 100 blkptr_t *bp = &lr->lr_blkptr; 101 zbookmark_phys_t zb; 102 103 if (BP_IS_HOLE(bp)) 104 return (0); 105 106 if (claim_txg == 0 || bp->blk_birth < claim_txg) 107 return (0); 108 109 SET_BOOKMARK(&zb, td->td_objset, lr->lr_foid, 110 ZB_ZIL_LEVEL, lr->lr_offset / BP_GET_LSIZE(bp)); 111 112 (void) td->td_func(td->td_spa, zilog, bp, &zb, NULL, 113 td->td_arg); 114 } 115 return (0); 116} 117 118static void 119traverse_zil(traverse_data_t *td, zil_header_t *zh) 120{ 121 uint64_t claim_txg = zh->zh_claim_txg; 122 zilog_t *zilog; 123 124 /* 125 * We only want to visit blocks that have been claimed but not yet 126 * replayed; plus, in read-only mode, blocks that are already stable. 127 */ 128 if (claim_txg == 0 && spa_writeable(td->td_spa)) 129 return; 130 131 zilog = zil_alloc(spa_get_dsl(td->td_spa)->dp_meta_objset, zh); 132 133 (void) zil_parse(zilog, traverse_zil_block, traverse_zil_record, td, 134 claim_txg); 135 136 zil_free(zilog); 137} 138 139typedef enum resume_skip { 140 RESUME_SKIP_ALL, 141 RESUME_SKIP_NONE, 142 RESUME_SKIP_CHILDREN 143} resume_skip_t; 144 145/* 146 * Returns RESUME_SKIP_ALL if td indicates that we are resuming a traversal and 147 * the block indicated by zb does not need to be visited at all. Returns 148 * RESUME_SKIP_CHILDREN if we are resuming a post traversal and we reach the 149 * resume point. This indicates that this block should be visited but not its 150 * children (since they must have been visited in a previous traversal). 151 * Otherwise returns RESUME_SKIP_NONE. 152 */ 153static resume_skip_t 154resume_skip_check(traverse_data_t *td, const dnode_phys_t *dnp, 155 const zbookmark_phys_t *zb) 156{ 157 if (td->td_resume != NULL && !ZB_IS_ZERO(td->td_resume)) { 158 /* 159 * If we already visited this bp & everything below, 160 * don't bother doing it again. 161 */ 162 if (zbookmark_subtree_completed(dnp, zb, td->td_resume)) 163 return (RESUME_SKIP_ALL); 164 165 /* 166 * If we found the block we're trying to resume from, zero 167 * the bookmark out to indicate that we have resumed. 168 */ 169 if (bcmp(zb, td->td_resume, sizeof (*zb)) == 0) { 170 bzero(td->td_resume, sizeof (*zb)); 171 if (td->td_flags & TRAVERSE_POST) 172 return (RESUME_SKIP_CHILDREN); 173 } 174 } 175 return (RESUME_SKIP_NONE); 176} 177 178static void 179traverse_prefetch_metadata(traverse_data_t *td, 180 const blkptr_t *bp, const zbookmark_phys_t *zb) 181{ 182 arc_flags_t flags = ARC_FLAG_NOWAIT | ARC_FLAG_PREFETCH; 183 184 if (!(td->td_flags & TRAVERSE_PREFETCH_METADATA)) 185 return; 186 /* 187 * If we are in the process of resuming, don't prefetch, because 188 * some children will not be needed (and in fact may have already 189 * been freed). 190 */ 191 if (td->td_resume != NULL && !ZB_IS_ZERO(td->td_resume)) 192 return; 193 if (BP_IS_HOLE(bp) || bp->blk_birth <= td->td_min_txg) 194 return; 195 if (BP_GET_LEVEL(bp) == 0 && BP_GET_TYPE(bp) != DMU_OT_DNODE) 196 return; 197 198 (void) arc_read(NULL, td->td_spa, bp, NULL, NULL, 199 ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL, &flags, zb); 200} 201 202static boolean_t 203prefetch_needed(prefetch_data_t *pfd, const blkptr_t *bp) 204{ 205 ASSERT(pfd->pd_flags & TRAVERSE_PREFETCH_DATA); 206 if (BP_IS_HOLE(bp) || BP_IS_EMBEDDED(bp) || 207 BP_GET_TYPE(bp) == DMU_OT_INTENT_LOG) 208 return (B_FALSE); 209 return (B_TRUE); 210} 211 212static int 213traverse_visitbp(traverse_data_t *td, const dnode_phys_t *dnp, 214 const blkptr_t *bp, const zbookmark_phys_t *zb) 215{ 216 zbookmark_phys_t czb; 217 int err = 0; 218 arc_buf_t *buf = NULL; 219 prefetch_data_t *pd = td->td_pfd; 220 boolean_t hard = td->td_flags & TRAVERSE_HARD; 221 222 switch (resume_skip_check(td, dnp, zb)) { 223 case RESUME_SKIP_ALL: 224 return (0); 225 case RESUME_SKIP_CHILDREN: 226 goto post; 227 case RESUME_SKIP_NONE: 228 break; 229 default: 230 ASSERT(0); 231 } 232 233 if (bp->blk_birth == 0) { 234 /* 235 * Since this block has a birth time of 0 it must be a 236 * hole created before the SPA_FEATURE_HOLE_BIRTH 237 * feature was enabled. If SPA_FEATURE_HOLE_BIRTH 238 * was enabled before the min_txg for this traveral we 239 * know the hole must have been created before the 240 * min_txg for this traveral, so we can skip it. If 241 * SPA_FEATURE_HOLE_BIRTH was enabled after the min_txg 242 * for this traveral we cannot tell if the hole was 243 * created before or after the min_txg for this 244 * traversal, so we cannot skip it. 245 */ 246 if (td->td_hole_birth_enabled_txg < td->td_min_txg) 247 return (0); 248 } else if (bp->blk_birth <= td->td_min_txg) { 249 return (0); 250 } 251 252 if (pd != NULL && !pd->pd_exited && prefetch_needed(pd, bp)) { 253 uint64_t size = BP_GET_LSIZE(bp); 254 mutex_enter(&pd->pd_mtx); 255 ASSERT(pd->pd_bytes_fetched >= 0); 256 while (pd->pd_bytes_fetched < size && !pd->pd_exited) 257 cv_wait(&pd->pd_cv, &pd->pd_mtx); 258 pd->pd_bytes_fetched -= size; 259 cv_broadcast(&pd->pd_cv); 260 mutex_exit(&pd->pd_mtx); 261 } 262 263 if (BP_IS_HOLE(bp)) { 264 err = td->td_func(td->td_spa, NULL, bp, zb, dnp, td->td_arg); 265 if (err != 0) 266 goto post; 267 return (0); 268 } 269 270 if (td->td_flags & TRAVERSE_PRE) { 271 err = td->td_func(td->td_spa, NULL, bp, zb, dnp, 272 td->td_arg); 273 if (err == TRAVERSE_VISIT_NO_CHILDREN) 274 return (0); 275 if (err != 0) 276 goto post; 277 } 278 279 if (BP_GET_LEVEL(bp) > 0) { 280 arc_flags_t flags = ARC_FLAG_WAIT; 281 int i; 282 blkptr_t *cbp; 283 int epb = BP_GET_LSIZE(bp) >> SPA_BLKPTRSHIFT; 284 285 err = arc_read(NULL, td->td_spa, bp, arc_getbuf_func, &buf, 286 ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL, &flags, zb); 287 if (err != 0) 288 goto post; 289 cbp = buf->b_data; 290 291 for (i = 0; i < epb; i++) { 292 SET_BOOKMARK(&czb, zb->zb_objset, zb->zb_object, 293 zb->zb_level - 1, 294 zb->zb_blkid * epb + i); 295 traverse_prefetch_metadata(td, &cbp[i], &czb); 296 } 297 298 /* recursively visitbp() blocks below this */ 299 for (i = 0; i < epb; i++) { 300 SET_BOOKMARK(&czb, zb->zb_objset, zb->zb_object, 301 zb->zb_level - 1, 302 zb->zb_blkid * epb + i); 303 err = traverse_visitbp(td, dnp, &cbp[i], &czb); 304 if (err != 0) 305 break; 306 } 307 } else if (BP_GET_TYPE(bp) == DMU_OT_DNODE) { 308 arc_flags_t flags = ARC_FLAG_WAIT; 309 int i; 310 int epb = BP_GET_LSIZE(bp) >> DNODE_SHIFT; 311 312 err = arc_read(NULL, td->td_spa, bp, arc_getbuf_func, &buf, 313 ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL, &flags, zb); 314 if (err != 0) 315 goto post; 316 dnode_phys_t *child_dnp = buf->b_data; 317 318 for (i = 0; i < epb; i++) { 319 prefetch_dnode_metadata(td, &child_dnp[i], 320 zb->zb_objset, zb->zb_blkid * epb + i); 321 } 322 323 /* recursively visitbp() blocks below this */ 324 for (i = 0; i < epb; i++) { 325 err = traverse_dnode(td, &child_dnp[i], 326 zb->zb_objset, zb->zb_blkid * epb + i); 327 if (err != 0) 328 break; 329 } 330 } else if (BP_GET_TYPE(bp) == DMU_OT_OBJSET) { 331 arc_flags_t flags = ARC_FLAG_WAIT; 332 333 err = arc_read(NULL, td->td_spa, bp, arc_getbuf_func, &buf, 334 ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL, &flags, zb); 335 if (err != 0) 336 goto post; 337 338 objset_phys_t *osp = buf->b_data; 339 prefetch_dnode_metadata(td, &osp->os_meta_dnode, zb->zb_objset, 340 DMU_META_DNODE_OBJECT); 341 if (arc_buf_size(buf) >= sizeof (objset_phys_t)) { 342 prefetch_dnode_metadata(td, &osp->os_groupused_dnode, 343 zb->zb_objset, DMU_GROUPUSED_OBJECT); 344 prefetch_dnode_metadata(td, &osp->os_userused_dnode, 345 zb->zb_objset, DMU_USERUSED_OBJECT); 346 } 347 348 err = traverse_dnode(td, &osp->os_meta_dnode, zb->zb_objset, 349 DMU_META_DNODE_OBJECT); 350 if (err == 0 && arc_buf_size(buf) >= sizeof (objset_phys_t)) { 351 err = traverse_dnode(td, &osp->os_groupused_dnode, 352 zb->zb_objset, DMU_GROUPUSED_OBJECT); 353 } 354 if (err == 0 && arc_buf_size(buf) >= sizeof (objset_phys_t)) { 355 err = traverse_dnode(td, &osp->os_userused_dnode, 356 zb->zb_objset, DMU_USERUSED_OBJECT); 357 } 358 } 359 360 if (buf) 361 (void) arc_buf_remove_ref(buf, &buf); 362 363post: 364 if (err == 0 && (td->td_flags & TRAVERSE_POST)) 365 err = td->td_func(td->td_spa, NULL, bp, zb, dnp, td->td_arg); 366 367 if (hard && (err == EIO || err == ECKSUM)) { 368 /* 369 * Ignore this disk error as requested by the HARD flag, 370 * and continue traversal. 371 */ 372 err = 0; 373 } 374 375 /* 376 * If we are stopping here, set td_resume. 377 */ 378 if (td->td_resume != NULL && err != 0 && !td->td_paused) { 379 td->td_resume->zb_objset = zb->zb_objset; 380 td->td_resume->zb_object = zb->zb_object; 381 td->td_resume->zb_level = 0; 382 /* 383 * If we have stopped on an indirect block (e.g. due to 384 * i/o error), we have not visited anything below it. 385 * Set the bookmark to the first level-0 block that we need 386 * to visit. This way, the resuming code does not need to 387 * deal with resuming from indirect blocks. 388 * 389 * Note, if zb_level <= 0, dnp may be NULL, so we don't want 390 * to dereference it. 391 */ 392 td->td_resume->zb_blkid = zb->zb_blkid; 393 if (zb->zb_level > 0) { 394 td->td_resume->zb_blkid <<= zb->zb_level * 395 (dnp->dn_indblkshift - SPA_BLKPTRSHIFT); 396 } 397 td->td_paused = B_TRUE; 398 } 399 400 return (err); 401} 402 403static void 404prefetch_dnode_metadata(traverse_data_t *td, const dnode_phys_t *dnp, 405 uint64_t objset, uint64_t object) 406{ 407 int j; 408 zbookmark_phys_t czb; 409 410 for (j = 0; j < dnp->dn_nblkptr; j++) { 411 SET_BOOKMARK(&czb, objset, object, dnp->dn_nlevels - 1, j); 412 traverse_prefetch_metadata(td, &dnp->dn_blkptr[j], &czb); 413 } 414 415 if (dnp->dn_flags & DNODE_FLAG_SPILL_BLKPTR) { 416 SET_BOOKMARK(&czb, objset, object, 0, DMU_SPILL_BLKID); 417 traverse_prefetch_metadata(td, &dnp->dn_spill, &czb); 418 } 419} 420 421static int 422traverse_dnode(traverse_data_t *td, const dnode_phys_t *dnp, 423 uint64_t objset, uint64_t object) 424{ 425 int j, err = 0; 426 zbookmark_phys_t czb; 427 428 if (object != DMU_META_DNODE_OBJECT && td->td_resume != NULL && 429 object < td->td_resume->zb_object) 430 return (0); 431 432 if (td->td_flags & TRAVERSE_PRE) { 433 SET_BOOKMARK(&czb, objset, object, ZB_DNODE_LEVEL, 434 ZB_DNODE_BLKID); 435 err = td->td_func(td->td_spa, NULL, NULL, &czb, dnp, 436 td->td_arg); 437 if (err == TRAVERSE_VISIT_NO_CHILDREN) 438 return (0); 439 if (err != 0) 440 return (err); 441 } 442 443 for (j = 0; j < dnp->dn_nblkptr; j++) { 444 SET_BOOKMARK(&czb, objset, object, dnp->dn_nlevels - 1, j); 445 err = traverse_visitbp(td, dnp, &dnp->dn_blkptr[j], &czb); 446 if (err != 0) 447 break; 448 } 449 450 if (err == 0 && (dnp->dn_flags & DNODE_FLAG_SPILL_BLKPTR)) { 451 SET_BOOKMARK(&czb, objset, object, 0, DMU_SPILL_BLKID); 452 err = traverse_visitbp(td, dnp, &dnp->dn_spill, &czb); 453 } 454 455 if (err == 0 && (td->td_flags & TRAVERSE_POST)) { 456 SET_BOOKMARK(&czb, objset, object, ZB_DNODE_LEVEL, 457 ZB_DNODE_BLKID); 458 err = td->td_func(td->td_spa, NULL, NULL, &czb, dnp, 459 td->td_arg); 460 if (err == TRAVERSE_VISIT_NO_CHILDREN) 461 return (0); 462 if (err != 0) 463 return (err); 464 } 465 return (err); 466} 467 468/* ARGSUSED */ 469static int 470traverse_prefetcher(spa_t *spa, zilog_t *zilog, const blkptr_t *bp, 471 const zbookmark_phys_t *zb, const dnode_phys_t *dnp, void *arg) 472{ 473 prefetch_data_t *pfd = arg; 474 arc_flags_t aflags = ARC_FLAG_NOWAIT | ARC_FLAG_PREFETCH; 475 476 ASSERT(pfd->pd_bytes_fetched >= 0); 477 if (bp == NULL) 478 return (0); 479 if (pfd->pd_cancel) 480 return (SET_ERROR(EINTR)); 481 482 if (!prefetch_needed(pfd, bp)) 483 return (0); 484 485 mutex_enter(&pfd->pd_mtx); 486 while (!pfd->pd_cancel && pfd->pd_bytes_fetched >= zfs_pd_bytes_max) 487 cv_wait(&pfd->pd_cv, &pfd->pd_mtx); 488 pfd->pd_bytes_fetched += BP_GET_LSIZE(bp); 489 cv_broadcast(&pfd->pd_cv); 490 mutex_exit(&pfd->pd_mtx); 491 492 (void) arc_read(NULL, spa, bp, NULL, NULL, ZIO_PRIORITY_ASYNC_READ, 493 ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE, &aflags, zb); 494 495 return (0); 496} 497 498static void 499traverse_prefetch_thread(void *arg) 500{ 501 traverse_data_t *td_main = arg; 502 traverse_data_t td = *td_main; 503 zbookmark_phys_t czb; 504 505 td.td_func = traverse_prefetcher; 506 td.td_arg = td_main->td_pfd; 507 td.td_pfd = NULL; 508 td.td_resume = &td_main->td_pfd->pd_resume; 509 510 SET_BOOKMARK(&czb, td.td_objset, 511 ZB_ROOT_OBJECT, ZB_ROOT_LEVEL, ZB_ROOT_BLKID); 512 (void) traverse_visitbp(&td, NULL, td.td_rootbp, &czb); 513 514 mutex_enter(&td_main->td_pfd->pd_mtx); 515 td_main->td_pfd->pd_exited = B_TRUE; 516 cv_broadcast(&td_main->td_pfd->pd_cv); 517 mutex_exit(&td_main->td_pfd->pd_mtx); 518} 519 520/* 521 * NB: dataset must not be changing on-disk (eg, is a snapshot or we are 522 * in syncing context). 523 */ 524static int 525traverse_impl(spa_t *spa, dsl_dataset_t *ds, uint64_t objset, blkptr_t *rootbp, 526 uint64_t txg_start, zbookmark_phys_t *resume, int flags, 527 blkptr_cb_t func, void *arg) 528{ 529 traverse_data_t td; 530 prefetch_data_t pd = { 0 }; 531 zbookmark_phys_t czb; 532 int err; 533 534 ASSERT(ds == NULL || objset == ds->ds_object); 535 ASSERT(!(flags & TRAVERSE_PRE) || !(flags & TRAVERSE_POST)); 536 537 td.td_spa = spa; 538 td.td_objset = objset; 539 td.td_rootbp = rootbp; 540 td.td_min_txg = txg_start; 541 td.td_resume = resume; 542 td.td_func = func; 543 td.td_arg = arg; 544 td.td_pfd = &pd; 545 td.td_flags = flags; 546 td.td_paused = B_FALSE; 547 548 if (spa_feature_is_active(spa, SPA_FEATURE_HOLE_BIRTH)) { 549 VERIFY(spa_feature_enabled_txg(spa, 550 SPA_FEATURE_HOLE_BIRTH, &td.td_hole_birth_enabled_txg)); 551 } else { 552 td.td_hole_birth_enabled_txg = 0; 553 } 554 555 pd.pd_flags = flags; 556 if (resume != NULL) 557 pd.pd_resume = *resume; 558 mutex_init(&pd.pd_mtx, NULL, MUTEX_DEFAULT, NULL); 559 cv_init(&pd.pd_cv, NULL, CV_DEFAULT, NULL); 560 561 /* See comment on ZIL traversal in dsl_scan_visitds. */ 562 if (ds != NULL && !ds->ds_is_snapshot && !BP_IS_HOLE(rootbp)) { 563 arc_flags_t flags = ARC_FLAG_WAIT; 564 objset_phys_t *osp; 565 arc_buf_t *buf; 566 567 err = arc_read(NULL, td.td_spa, rootbp, 568 arc_getbuf_func, &buf, 569 ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL, &flags, NULL); 570 if (err != 0) 571 return (err); 572 573 osp = buf->b_data; 574 traverse_zil(&td, &osp->os_zil_header); 575 (void) arc_buf_remove_ref(buf, &buf); 576 } 577 578 if (!(flags & TRAVERSE_PREFETCH_DATA) || 579 0 == taskq_dispatch(system_taskq, traverse_prefetch_thread, 580 &td, TQ_NOQUEUE)) 581 pd.pd_exited = B_TRUE; 582 583 SET_BOOKMARK(&czb, td.td_objset, 584 ZB_ROOT_OBJECT, ZB_ROOT_LEVEL, ZB_ROOT_BLKID); 585 err = traverse_visitbp(&td, NULL, rootbp, &czb); 586 587 mutex_enter(&pd.pd_mtx); 588 pd.pd_cancel = B_TRUE; 589 cv_broadcast(&pd.pd_cv); 590 while (!pd.pd_exited) 591 cv_wait(&pd.pd_cv, &pd.pd_mtx); 592 mutex_exit(&pd.pd_mtx); 593 594 mutex_destroy(&pd.pd_mtx); 595 cv_destroy(&pd.pd_cv); 596 597 return (err); 598} 599 600/* 601 * NB: dataset must not be changing on-disk (eg, is a snapshot or we are 602 * in syncing context). 603 */ 604int 605traverse_dataset_resume(dsl_dataset_t *ds, uint64_t txg_start, 606 zbookmark_phys_t *resume, 607 int flags, blkptr_cb_t func, void *arg) 608{ 609 return (traverse_impl(ds->ds_dir->dd_pool->dp_spa, ds, ds->ds_object, 610 &dsl_dataset_phys(ds)->ds_bp, txg_start, resume, flags, func, arg)); 611} 612 613int 614traverse_dataset(dsl_dataset_t *ds, uint64_t txg_start, 615 int flags, blkptr_cb_t func, void *arg) 616{ 617 return (traverse_dataset_resume(ds, txg_start, NULL, flags, func, arg)); 618} 619 620int 621traverse_dataset_destroyed(spa_t *spa, blkptr_t *blkptr, 622 uint64_t txg_start, zbookmark_phys_t *resume, int flags, 623 blkptr_cb_t func, void *arg) 624{ 625 return (traverse_impl(spa, NULL, ZB_DESTROYED_OBJSET, 626 blkptr, txg_start, resume, flags, func, arg)); 627} 628 629/* 630 * NB: pool must not be changing on-disk (eg, from zdb or sync context). 631 */ 632int 633traverse_pool(spa_t *spa, uint64_t txg_start, int flags, 634 blkptr_cb_t func, void *arg) 635{ 636 int err; 637 dsl_pool_t *dp = spa_get_dsl(spa); 638 objset_t *mos = dp->dp_meta_objset; 639 boolean_t hard = (flags & TRAVERSE_HARD); 640 641 /* visit the MOS */ 642 err = traverse_impl(spa, NULL, 0, spa_get_rootblkptr(spa), 643 txg_start, NULL, flags, func, arg); 644 if (err != 0) 645 return (err); 646 647 /* visit each dataset */ 648 for (uint64_t obj = 1; err == 0; 649 err = dmu_object_next(mos, &obj, B_FALSE, txg_start)) { 650 dmu_object_info_t doi; 651 652 err = dmu_object_info(mos, obj, &doi); 653 if (err != 0) { 654 if (hard) 655 continue; 656 break; 657 } 658 659 if (doi.doi_bonus_type == DMU_OT_DSL_DATASET) { 660 dsl_dataset_t *ds; 661 uint64_t txg = txg_start; 662 663 dsl_pool_config_enter(dp, FTAG); 664 err = dsl_dataset_hold_obj(dp, obj, FTAG, &ds); 665 dsl_pool_config_exit(dp, FTAG); 666 if (err != 0) { 667 if (hard) 668 continue; 669 break; 670 } 671 if (dsl_dataset_phys(ds)->ds_prev_snap_txg > txg) 672 txg = dsl_dataset_phys(ds)->ds_prev_snap_txg; 673 err = traverse_dataset(ds, txg, flags, func, arg); 674 dsl_dataset_rele(ds, FTAG); 675 if (err != 0) 676 break; 677 } 678 } 679 if (err == ESRCH) 680 err = 0; 681 return (err); 682} 683