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, 2018 by Delphix. All rights reserved. 24 */ 25 26 #include <sys/zfs_context.h> 27 #include <sys/dmu_objset.h> 28 #include <sys/dmu_traverse.h> 29 #include <sys/dsl_dataset.h> 30 #include <sys/dsl_dir.h> 31 #include <sys/dsl_pool.h> 32 #include <sys/dnode.h> 33 #include <sys/spa.h> 34 #include <sys/spa_impl.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 42 int32_t zfs_pd_bytes_max = 50 * 1024 * 1024; /* 50MB */ 43 boolean_t send_holes_without_birth_time = B_TRUE; 44 45 typedef struct prefetch_data { 46 kmutex_t pd_mtx; 47 kcondvar_t pd_cv; 48 int32_t pd_bytes_fetched; 49 int pd_flags; 50 boolean_t pd_cancel; 51 boolean_t pd_exited; 52 zbookmark_phys_t pd_resume; 53 } prefetch_data_t; 54 55 typedef struct traverse_data { 56 spa_t *td_spa; 57 uint64_t td_objset; 58 blkptr_t *td_rootbp; 59 uint64_t td_min_txg; 60 zbookmark_phys_t *td_resume; 61 int td_flags; 62 prefetch_data_t *td_pfd; 63 boolean_t td_paused; 64 uint64_t td_hole_birth_enabled_txg; 65 blkptr_cb_t *td_func; 66 void *td_arg; 67 boolean_t td_realloc_possible; 68 } traverse_data_t; 69 70 static int traverse_dnode(traverse_data_t *td, const dnode_phys_t *dnp, 71 uint64_t objset, uint64_t object); 72 static void prefetch_dnode_metadata(traverse_data_t *td, const dnode_phys_t *, 73 uint64_t objset, uint64_t object); 74 75 static int 76 traverse_zil_block(zilog_t *zilog, blkptr_t *bp, void *arg, uint64_t claim_txg) 77 { 78 traverse_data_t *td = arg; 79 zbookmark_phys_t zb; 80 81 if (BP_IS_HOLE(bp)) 82 return (0); 83 84 if (claim_txg == 0 && bp->blk_birth >= spa_min_claim_txg(td->td_spa)) 85 return (-1); 86 87 SET_BOOKMARK(&zb, td->td_objset, ZB_ZIL_OBJECT, ZB_ZIL_LEVEL, 88 bp->blk_cksum.zc_word[ZIL_ZC_SEQ]); 89 90 (void) td->td_func(td->td_spa, zilog, bp, &zb, NULL, td->td_arg); 91 92 return (0); 93 } 94 95 static int 96 traverse_zil_record(zilog_t *zilog, lr_t *lrc, void *arg, uint64_t claim_txg) 97 { 98 traverse_data_t *td = arg; 99 100 if (lrc->lrc_txtype == TX_WRITE) { 101 lr_write_t *lr = (lr_write_t *)lrc; 102 blkptr_t *bp = &lr->lr_blkptr; 103 zbookmark_phys_t zb; 104 105 if (BP_IS_HOLE(bp)) 106 return (0); 107 108 if (claim_txg == 0 || bp->blk_birth < claim_txg) 109 return (0); 110 111 SET_BOOKMARK(&zb, td->td_objset, lr->lr_foid, 112 ZB_ZIL_LEVEL, lr->lr_offset / BP_GET_LSIZE(bp)); 113 114 (void) td->td_func(td->td_spa, zilog, bp, &zb, NULL, 115 td->td_arg); 116 } 117 return (0); 118 } 119 120 static void 121 traverse_zil(traverse_data_t *td, zil_header_t *zh) 122 { 123 uint64_t claim_txg = zh->zh_claim_txg; 124 125 /* 126 * We only want to visit blocks that have been claimed but not yet 127 * replayed; plus blocks that are already stable in read-only mode. 128 */ 129 if (claim_txg == 0 && spa_writeable(td->td_spa)) 130 return; 131 132 zilog_t *zilog = zil_alloc(spa_get_dsl(td->td_spa)->dp_meta_objset, zh); 133 (void) zil_parse(zilog, traverse_zil_block, traverse_zil_record, td, 134 claim_txg, !(td->td_flags & TRAVERSE_NO_DECRYPT)); 135 zil_free(zilog); 136 } 137 138 typedef enum resume_skip { 139 RESUME_SKIP_ALL, 140 RESUME_SKIP_NONE, 141 RESUME_SKIP_CHILDREN 142 } resume_skip_t; 143 144 /* 145 * Returns RESUME_SKIP_ALL if td indicates that we are resuming a traversal and 146 * the block indicated by zb does not need to be visited at all. Returns 147 * RESUME_SKIP_CHILDREN if we are resuming a post traversal and we reach the 148 * resume point. This indicates that this block should be visited but not its 149 * children (since they must have been visited in a previous traversal). 150 * Otherwise returns RESUME_SKIP_NONE. 151 */ 152 static resume_skip_t 153 resume_skip_check(traverse_data_t *td, const dnode_phys_t *dnp, 154 const zbookmark_phys_t *zb) 155 { 156 if (td->td_resume != NULL && !ZB_IS_ZERO(td->td_resume)) { 157 /* 158 * If we already visited this bp & everything below, 159 * don't bother doing it again. 160 */ 161 if (zbookmark_subtree_completed(dnp, zb, td->td_resume)) 162 return (RESUME_SKIP_ALL); 163 164 /* 165 * If we found the block we're trying to resume from, zero 166 * the bookmark out to indicate that we have resumed. 167 */ 168 if (bcmp(zb, td->td_resume, sizeof (*zb)) == 0) { 169 bzero(td->td_resume, sizeof (*zb)); 170 if (td->td_flags & TRAVERSE_POST) 171 return (RESUME_SKIP_CHILDREN); 172 } 173 } 174 return (RESUME_SKIP_NONE); 175 } 176 177 static void 178 traverse_prefetch_metadata(traverse_data_t *td, 179 const blkptr_t *bp, const zbookmark_phys_t *zb) 180 { 181 arc_flags_t flags = ARC_FLAG_NOWAIT | ARC_FLAG_PREFETCH; 182 int zio_flags = ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE; 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 if ((td->td_flags & TRAVERSE_NO_DECRYPT) && BP_IS_PROTECTED(bp)) 199 zio_flags |= ZIO_FLAG_RAW; 200 201 (void) arc_read(NULL, td->td_spa, bp, NULL, NULL, 202 ZIO_PRIORITY_ASYNC_READ, zio_flags, &flags, zb); 203 } 204 205 static boolean_t 206 prefetch_needed(prefetch_data_t *pfd, const blkptr_t *bp) 207 { 208 ASSERT(pfd->pd_flags & TRAVERSE_PREFETCH_DATA); 209 if (BP_IS_HOLE(bp) || BP_IS_EMBEDDED(bp) || 210 BP_GET_TYPE(bp) == DMU_OT_INTENT_LOG) 211 return (B_FALSE); 212 return (B_TRUE); 213 } 214 215 static int 216 traverse_visitbp(traverse_data_t *td, const dnode_phys_t *dnp, 217 const blkptr_t *bp, const zbookmark_phys_t *zb) 218 { 219 zbookmark_phys_t czb; 220 int err = 0; 221 arc_buf_t *buf = NULL; 222 prefetch_data_t *pd = td->td_pfd; 223 boolean_t hard = td->td_flags & TRAVERSE_HARD; 224 225 switch (resume_skip_check(td, dnp, zb)) { 226 case RESUME_SKIP_ALL: 227 return (0); 228 case RESUME_SKIP_CHILDREN: 229 goto post; 230 case RESUME_SKIP_NONE: 231 break; 232 default: 233 ASSERT(0); 234 } 235 236 if (bp->blk_birth == 0) { 237 /* 238 * Since this block has a birth time of 0 it must be one of 239 * two things: a hole created before the 240 * SPA_FEATURE_HOLE_BIRTH feature was enabled, or a hole 241 * which has always been a hole in an object. 242 * 243 * If a file is written sparsely, then the unwritten parts of 244 * the file were "always holes" -- that is, they have been 245 * holes since this object was allocated. However, we (and 246 * our callers) can not necessarily tell when an object was 247 * allocated. Therefore, if it's possible that this object 248 * was freed and then its object number reused, we need to 249 * visit all the holes with birth==0. 250 * 251 * If it isn't possible that the object number was reused, 252 * then if SPA_FEATURE_HOLE_BIRTH was enabled before we wrote 253 * all the blocks we will visit as part of this traversal, 254 * then this hole must have always existed, so we can skip 255 * it. We visit blocks born after (exclusive) td_min_txg. 256 * 257 * Note that the meta-dnode cannot be reallocated. 258 */ 259 if (!send_holes_without_birth_time && 260 (!td->td_realloc_possible || 261 zb->zb_object == DMU_META_DNODE_OBJECT) && 262 td->td_hole_birth_enabled_txg <= td->td_min_txg) 263 return (0); 264 } else if (bp->blk_birth <= td->td_min_txg) { 265 return (0); 266 } 267 268 if (pd != NULL && !pd->pd_exited && prefetch_needed(pd, bp)) { 269 uint64_t size = BP_GET_LSIZE(bp); 270 mutex_enter(&pd->pd_mtx); 271 ASSERT(pd->pd_bytes_fetched >= 0); 272 while (pd->pd_bytes_fetched < size && !pd->pd_exited) 273 cv_wait(&pd->pd_cv, &pd->pd_mtx); 274 pd->pd_bytes_fetched -= size; 275 cv_broadcast(&pd->pd_cv); 276 mutex_exit(&pd->pd_mtx); 277 } 278 279 if (BP_IS_HOLE(bp)) { 280 err = td->td_func(td->td_spa, NULL, bp, zb, dnp, td->td_arg); 281 if (err != 0) 282 goto post; 283 return (0); 284 } 285 286 if (td->td_flags & TRAVERSE_PRE) { 287 err = td->td_func(td->td_spa, NULL, bp, zb, dnp, 288 td->td_arg); 289 if (err == TRAVERSE_VISIT_NO_CHILDREN) 290 return (0); 291 if (err != 0) 292 goto post; 293 } 294 295 if (BP_GET_LEVEL(bp) > 0) { 296 arc_flags_t flags = ARC_FLAG_WAIT; 297 int i; 298 blkptr_t *cbp; 299 int epb = BP_GET_LSIZE(bp) >> SPA_BLKPTRSHIFT; 300 301 ASSERT(!BP_IS_PROTECTED(bp)); 302 303 err = arc_read(NULL, td->td_spa, bp, arc_getbuf_func, &buf, 304 ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL, &flags, zb); 305 if (err != 0) 306 goto post; 307 cbp = buf->b_data; 308 309 for (i = 0; i < epb; i++) { 310 SET_BOOKMARK(&czb, zb->zb_objset, zb->zb_object, 311 zb->zb_level - 1, 312 zb->zb_blkid * epb + i); 313 traverse_prefetch_metadata(td, &cbp[i], &czb); 314 } 315 316 /* recursively visitbp() blocks below this */ 317 for (i = 0; i < epb; i++) { 318 SET_BOOKMARK(&czb, zb->zb_objset, zb->zb_object, 319 zb->zb_level - 1, 320 zb->zb_blkid * epb + i); 321 err = traverse_visitbp(td, dnp, &cbp[i], &czb); 322 if (err != 0) 323 break; 324 } 325 } else if (BP_GET_TYPE(bp) == DMU_OT_DNODE) { 326 arc_flags_t flags = ARC_FLAG_WAIT; 327 uint32_t zio_flags = ZIO_FLAG_CANFAIL; 328 int i; 329 int epb = BP_GET_LSIZE(bp) >> DNODE_SHIFT; 330 331 /* 332 * dnode blocks might have their bonus buffers encrypted, so 333 * we must be careful to honor TRAVERSE_NO_DECRYPT 334 */ 335 if ((td->td_flags & TRAVERSE_NO_DECRYPT) && BP_IS_PROTECTED(bp)) 336 zio_flags |= ZIO_FLAG_RAW; 337 err = arc_read(NULL, td->td_spa, bp, arc_getbuf_func, &buf, 338 ZIO_PRIORITY_ASYNC_READ, zio_flags, &flags, zb); 339 if (err != 0) 340 goto post; 341 dnode_phys_t *child_dnp = buf->b_data; 342 343 for (i = 0; i < epb; i += child_dnp[i].dn_extra_slots + 1) { 344 prefetch_dnode_metadata(td, &child_dnp[i], 345 zb->zb_objset, zb->zb_blkid * epb + i); 346 } 347 348 /* recursively visitbp() blocks below this */ 349 for (i = 0; i < epb; i += child_dnp[i].dn_extra_slots + 1) { 350 err = traverse_dnode(td, &child_dnp[i], 351 zb->zb_objset, zb->zb_blkid * epb + i); 352 if (err != 0) 353 break; 354 } 355 } else if (BP_GET_TYPE(bp) == DMU_OT_OBJSET) { 356 uint32_t zio_flags = ZIO_FLAG_CANFAIL; 357 arc_flags_t flags = ARC_FLAG_WAIT; 358 359 if ((td->td_flags & TRAVERSE_NO_DECRYPT) && BP_IS_PROTECTED(bp)) 360 zio_flags |= ZIO_FLAG_RAW; 361 362 err = arc_read(NULL, td->td_spa, bp, arc_getbuf_func, &buf, 363 ZIO_PRIORITY_ASYNC_READ, zio_flags, &flags, zb); 364 if (err != 0) 365 goto post; 366 367 objset_phys_t *osp = buf->b_data; 368 prefetch_dnode_metadata(td, &osp->os_meta_dnode, zb->zb_objset, 369 DMU_META_DNODE_OBJECT); 370 /* 371 * See the block comment above for the goal of this variable. 372 * If the maxblkid of the meta-dnode is 0, then we know that 373 * we've never had more than DNODES_PER_BLOCK objects in the 374 * dataset, which means we can't have reused any object ids. 375 */ 376 if (osp->os_meta_dnode.dn_maxblkid == 0) 377 td->td_realloc_possible = B_FALSE; 378 379 if (OBJSET_BUF_HAS_USERUSED(buf)) { 380 if (OBJSET_BUF_HAS_PROJECTUSED(buf)) 381 prefetch_dnode_metadata(td, 382 &osp->os_projectused_dnode, 383 zb->zb_objset, DMU_PROJECTUSED_OBJECT); 384 prefetch_dnode_metadata(td, &osp->os_groupused_dnode, 385 zb->zb_objset, DMU_GROUPUSED_OBJECT); 386 prefetch_dnode_metadata(td, &osp->os_userused_dnode, 387 zb->zb_objset, DMU_USERUSED_OBJECT); 388 } 389 390 err = traverse_dnode(td, &osp->os_meta_dnode, zb->zb_objset, 391 DMU_META_DNODE_OBJECT); 392 if (err == 0 && OBJSET_BUF_HAS_USERUSED(buf)) { 393 if (OBJSET_BUF_HAS_PROJECTUSED(buf)) 394 err = traverse_dnode(td, 395 &osp->os_projectused_dnode, zb->zb_objset, 396 DMU_PROJECTUSED_OBJECT); 397 if (err == 0) 398 err = traverse_dnode(td, 399 &osp->os_groupused_dnode, zb->zb_objset, 400 DMU_GROUPUSED_OBJECT); 401 if (err == 0) 402 err = traverse_dnode(td, 403 &osp->os_userused_dnode, zb->zb_objset, 404 DMU_USERUSED_OBJECT); 405 } 406 } 407 408 if (buf) 409 arc_buf_destroy(buf, &buf); 410 411 post: 412 if (err == 0 && (td->td_flags & TRAVERSE_POST)) 413 err = td->td_func(td->td_spa, NULL, bp, zb, dnp, td->td_arg); 414 415 if (hard && (err == EIO || err == ECKSUM)) { 416 /* 417 * Ignore this disk error as requested by the HARD flag, 418 * and continue traversal. 419 */ 420 err = 0; 421 } 422 423 /* 424 * If we are stopping here, set td_resume. 425 */ 426 if (td->td_resume != NULL && err != 0 && !td->td_paused) { 427 td->td_resume->zb_objset = zb->zb_objset; 428 td->td_resume->zb_object = zb->zb_object; 429 td->td_resume->zb_level = 0; 430 /* 431 * If we have stopped on an indirect block (e.g. due to 432 * i/o error), we have not visited anything below it. 433 * Set the bookmark to the first level-0 block that we need 434 * to visit. This way, the resuming code does not need to 435 * deal with resuming from indirect blocks. 436 * 437 * Note, if zb_level <= 0, dnp may be NULL, so we don't want 438 * to dereference it. 439 */ 440 td->td_resume->zb_blkid = zb->zb_blkid; 441 if (zb->zb_level > 0) { 442 td->td_resume->zb_blkid <<= zb->zb_level * 443 (dnp->dn_indblkshift - SPA_BLKPTRSHIFT); 444 } 445 td->td_paused = B_TRUE; 446 } 447 448 return (err); 449 } 450 451 static void 452 prefetch_dnode_metadata(traverse_data_t *td, const dnode_phys_t *dnp, 453 uint64_t objset, uint64_t object) 454 { 455 int j; 456 zbookmark_phys_t czb; 457 458 for (j = 0; j < dnp->dn_nblkptr; j++) { 459 SET_BOOKMARK(&czb, objset, object, dnp->dn_nlevels - 1, j); 460 traverse_prefetch_metadata(td, &dnp->dn_blkptr[j], &czb); 461 } 462 463 if (dnp->dn_flags & DNODE_FLAG_SPILL_BLKPTR) { 464 SET_BOOKMARK(&czb, objset, object, 0, DMU_SPILL_BLKID); 465 traverse_prefetch_metadata(td, DN_SPILL_BLKPTR(dnp), &czb); 466 } 467 } 468 469 static int 470 traverse_dnode(traverse_data_t *td, const dnode_phys_t *dnp, 471 uint64_t objset, uint64_t object) 472 { 473 int j, err = 0; 474 zbookmark_phys_t czb; 475 476 if (object != DMU_META_DNODE_OBJECT && td->td_resume != NULL && 477 object < td->td_resume->zb_object) 478 return (0); 479 480 if (td->td_flags & TRAVERSE_PRE) { 481 SET_BOOKMARK(&czb, objset, object, ZB_DNODE_LEVEL, 482 ZB_DNODE_BLKID); 483 err = td->td_func(td->td_spa, NULL, NULL, &czb, dnp, 484 td->td_arg); 485 if (err == TRAVERSE_VISIT_NO_CHILDREN) 486 return (0); 487 if (err != 0) 488 return (err); 489 } 490 491 for (j = 0; j < dnp->dn_nblkptr; j++) { 492 SET_BOOKMARK(&czb, objset, object, dnp->dn_nlevels - 1, j); 493 err = traverse_visitbp(td, dnp, &dnp->dn_blkptr[j], &czb); 494 if (err != 0) 495 break; 496 } 497 498 if (err == 0 && (dnp->dn_flags & DNODE_FLAG_SPILL_BLKPTR)) { 499 SET_BOOKMARK(&czb, objset, object, 0, DMU_SPILL_BLKID); 500 err = traverse_visitbp(td, dnp, DN_SPILL_BLKPTR(dnp), &czb); 501 } 502 503 if (err == 0 && (td->td_flags & TRAVERSE_POST)) { 504 SET_BOOKMARK(&czb, objset, object, ZB_DNODE_LEVEL, 505 ZB_DNODE_BLKID); 506 err = td->td_func(td->td_spa, NULL, NULL, &czb, dnp, 507 td->td_arg); 508 if (err == TRAVERSE_VISIT_NO_CHILDREN) 509 return (0); 510 if (err != 0) 511 return (err); 512 } 513 return (err); 514 } 515 516 /* ARGSUSED */ 517 static int 518 traverse_prefetcher(spa_t *spa, zilog_t *zilog, const blkptr_t *bp, 519 const zbookmark_phys_t *zb, const dnode_phys_t *dnp, void *arg) 520 { 521 prefetch_data_t *pfd = arg; 522 int zio_flags = ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE; 523 arc_flags_t aflags = ARC_FLAG_NOWAIT | ARC_FLAG_PREFETCH | 524 ARC_FLAG_PRESCIENT_PREFETCH; 525 526 ASSERT(pfd->pd_bytes_fetched >= 0); 527 if (bp == NULL) 528 return (0); 529 if (pfd->pd_cancel) 530 return (SET_ERROR(EINTR)); 531 532 if (!prefetch_needed(pfd, bp)) 533 return (0); 534 535 mutex_enter(&pfd->pd_mtx); 536 while (!pfd->pd_cancel && pfd->pd_bytes_fetched >= zfs_pd_bytes_max) 537 cv_wait(&pfd->pd_cv, &pfd->pd_mtx); 538 pfd->pd_bytes_fetched += BP_GET_LSIZE(bp); 539 cv_broadcast(&pfd->pd_cv); 540 mutex_exit(&pfd->pd_mtx); 541 542 if ((pfd->pd_flags & TRAVERSE_NO_DECRYPT) && BP_IS_PROTECTED(bp)) 543 zio_flags |= ZIO_FLAG_RAW; 544 545 (void) arc_read(NULL, spa, bp, NULL, NULL, ZIO_PRIORITY_ASYNC_READ, 546 zio_flags, &aflags, zb); 547 548 return (0); 549 } 550 551 static void 552 traverse_prefetch_thread(void *arg) 553 { 554 traverse_data_t *td_main = arg; 555 traverse_data_t td = *td_main; 556 zbookmark_phys_t czb; 557 558 td.td_func = traverse_prefetcher; 559 td.td_arg = td_main->td_pfd; 560 td.td_pfd = NULL; 561 td.td_resume = &td_main->td_pfd->pd_resume; 562 563 SET_BOOKMARK(&czb, td.td_objset, 564 ZB_ROOT_OBJECT, ZB_ROOT_LEVEL, ZB_ROOT_BLKID); 565 (void) traverse_visitbp(&td, NULL, td.td_rootbp, &czb); 566 567 mutex_enter(&td_main->td_pfd->pd_mtx); 568 td_main->td_pfd->pd_exited = B_TRUE; 569 cv_broadcast(&td_main->td_pfd->pd_cv); 570 mutex_exit(&td_main->td_pfd->pd_mtx); 571 } 572 573 /* 574 * NB: dataset must not be changing on-disk (eg, is a snapshot or we are 575 * in syncing context). 576 */ 577 static int 578 traverse_impl(spa_t *spa, dsl_dataset_t *ds, uint64_t objset, blkptr_t *rootbp, 579 uint64_t txg_start, zbookmark_phys_t *resume, int flags, 580 blkptr_cb_t func, void *arg) 581 { 582 traverse_data_t td; 583 prefetch_data_t pd = { 0 }; 584 zbookmark_phys_t czb; 585 int err; 586 587 ASSERT(ds == NULL || objset == ds->ds_object); 588 ASSERT(!(flags & TRAVERSE_PRE) || !(flags & TRAVERSE_POST)); 589 590 td.td_spa = spa; 591 td.td_objset = objset; 592 td.td_rootbp = rootbp; 593 td.td_min_txg = txg_start; 594 td.td_resume = resume; 595 td.td_func = func; 596 td.td_arg = arg; 597 td.td_pfd = &pd; 598 td.td_flags = flags; 599 td.td_paused = B_FALSE; 600 td.td_realloc_possible = (txg_start == 0 ? B_FALSE : B_TRUE); 601 602 if (spa_feature_is_active(spa, SPA_FEATURE_HOLE_BIRTH)) { 603 VERIFY(spa_feature_enabled_txg(spa, 604 SPA_FEATURE_HOLE_BIRTH, &td.td_hole_birth_enabled_txg)); 605 } else { 606 td.td_hole_birth_enabled_txg = UINT64_MAX; 607 } 608 609 pd.pd_flags = flags; 610 if (resume != NULL) 611 pd.pd_resume = *resume; 612 mutex_init(&pd.pd_mtx, NULL, MUTEX_DEFAULT, NULL); 613 cv_init(&pd.pd_cv, NULL, CV_DEFAULT, NULL); 614 615 SET_BOOKMARK(&czb, td.td_objset, 616 ZB_ROOT_OBJECT, ZB_ROOT_LEVEL, ZB_ROOT_BLKID); 617 618 /* See comment on ZIL traversal in dsl_scan_visitds. */ 619 if (ds != NULL && !ds->ds_is_snapshot && !BP_IS_HOLE(rootbp)) { 620 enum zio_flag zio_flags = ZIO_FLAG_CANFAIL; 621 arc_flags_t flags = ARC_FLAG_WAIT; 622 objset_phys_t *osp; 623 arc_buf_t *buf; 624 625 if ((td.td_flags & TRAVERSE_NO_DECRYPT) && 626 BP_IS_PROTECTED(rootbp)) 627 zio_flags |= ZIO_FLAG_RAW; 628 629 err = arc_read(NULL, td.td_spa, rootbp, arc_getbuf_func, 630 &buf, ZIO_PRIORITY_ASYNC_READ, zio_flags, &flags, &czb); 631 if (err != 0) 632 return (err); 633 634 osp = buf->b_data; 635 traverse_zil(&td, &osp->os_zil_header); 636 arc_buf_destroy(buf, &buf); 637 } 638 639 if (!(flags & TRAVERSE_PREFETCH_DATA) || 640 taskq_dispatch(system_taskq, traverse_prefetch_thread, 641 &td, TQ_NOQUEUE) == TASKQID_INVALID) 642 pd.pd_exited = B_TRUE; 643 644 err = traverse_visitbp(&td, NULL, rootbp, &czb); 645 646 mutex_enter(&pd.pd_mtx); 647 pd.pd_cancel = B_TRUE; 648 cv_broadcast(&pd.pd_cv); 649 while (!pd.pd_exited) 650 cv_wait(&pd.pd_cv, &pd.pd_mtx); 651 mutex_exit(&pd.pd_mtx); 652 653 mutex_destroy(&pd.pd_mtx); 654 cv_destroy(&pd.pd_cv); 655 656 return (err); 657 } 658 659 /* 660 * NB: dataset must not be changing on-disk (eg, is a snapshot or we are 661 * in syncing context). 662 */ 663 int 664 traverse_dataset_resume(dsl_dataset_t *ds, uint64_t txg_start, 665 zbookmark_phys_t *resume, 666 int flags, blkptr_cb_t func, void *arg) 667 { 668 return (traverse_impl(ds->ds_dir->dd_pool->dp_spa, ds, ds->ds_object, 669 &dsl_dataset_phys(ds)->ds_bp, txg_start, resume, flags, func, arg)); 670 } 671 672 int 673 traverse_dataset(dsl_dataset_t *ds, uint64_t txg_start, 674 int flags, blkptr_cb_t func, void *arg) 675 { 676 return (traverse_dataset_resume(ds, txg_start, NULL, flags, func, arg)); 677 } 678 679 int 680 traverse_dataset_destroyed(spa_t *spa, blkptr_t *blkptr, 681 uint64_t txg_start, zbookmark_phys_t *resume, int flags, 682 blkptr_cb_t func, void *arg) 683 { 684 return (traverse_impl(spa, NULL, ZB_DESTROYED_OBJSET, 685 blkptr, txg_start, resume, flags, func, arg)); 686 } 687 688 /* 689 * NB: pool must not be changing on-disk (eg, from zdb or sync context). 690 */ 691 int 692 traverse_pool(spa_t *spa, uint64_t txg_start, int flags, 693 blkptr_cb_t func, void *arg) 694 { 695 int err; 696 dsl_pool_t *dp = spa_get_dsl(spa); 697 objset_t *mos = dp->dp_meta_objset; 698 boolean_t hard = (flags & TRAVERSE_HARD); 699 700 /* visit the MOS */ 701 err = traverse_impl(spa, NULL, 0, spa_get_rootblkptr(spa), 702 txg_start, NULL, flags, func, arg); 703 if (err != 0) 704 return (err); 705 706 /* visit each dataset */ 707 for (uint64_t obj = 1; err == 0; 708 err = dmu_object_next(mos, &obj, B_FALSE, txg_start)) { 709 dmu_object_info_t doi; 710 711 err = dmu_object_info(mos, obj, &doi); 712 if (err != 0) { 713 if (hard) 714 continue; 715 break; 716 } 717 718 if (doi.doi_bonus_type == DMU_OT_DSL_DATASET) { 719 dsl_dataset_t *ds; 720 uint64_t txg = txg_start; 721 722 dsl_pool_config_enter(dp, FTAG); 723 err = dsl_dataset_hold_obj(dp, obj, FTAG, &ds); 724 dsl_pool_config_exit(dp, FTAG); 725 if (err != 0) { 726 if (hard) 727 continue; 728 break; 729 } 730 if (dsl_dataset_phys(ds)->ds_prev_snap_txg > txg) 731 txg = dsl_dataset_phys(ds)->ds_prev_snap_txg; 732 err = traverse_dataset(ds, txg, flags, func, arg); 733 dsl_dataset_rele(ds, FTAG); 734 if (err != 0) 735 break; 736 } 737 } 738 if (err == ESRCH) 739 err = 0; 740 return (err); 741 } 742