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, 2016 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 42 int32_t zfs_pd_bytes_max = 50 * 1024 * 1024; /* 50MB */ 43 boolean_t send_holes_without_birth_time = B_TRUE; 44 45 #ifdef _KERNEL 46 SYSCTL_DECL(_vfs_zfs); 47 SYSCTL_UINT(_vfs_zfs, OID_AUTO, send_holes_without_birth_time, CTLFLAG_RWTUN, 48 &send_holes_without_birth_time, 0, "Send holes without birth time"); 49 #endif 50 51 typedef struct prefetch_data { 52 kmutex_t pd_mtx; 53 kcondvar_t pd_cv; 54 int32_t pd_bytes_fetched; 55 int pd_flags; 56 boolean_t pd_cancel; 57 boolean_t pd_exited; 58 zbookmark_phys_t pd_resume; 59 } prefetch_data_t; 60 61 typedef struct traverse_data { 62 spa_t *td_spa; 63 uint64_t td_objset; 64 blkptr_t *td_rootbp; 65 uint64_t td_min_txg; 66 zbookmark_phys_t *td_resume; 67 int td_flags; 68 prefetch_data_t *td_pfd; 69 boolean_t td_paused; 70 uint64_t td_hole_birth_enabled_txg; 71 blkptr_cb_t *td_func; 72 void *td_arg; 73 boolean_t td_realloc_possible; 74 } traverse_data_t; 75 76 static int traverse_dnode(traverse_data_t *td, const dnode_phys_t *dnp, 77 uint64_t objset, uint64_t object); 78 static void prefetch_dnode_metadata(traverse_data_t *td, const dnode_phys_t *, 79 uint64_t objset, uint64_t object); 80 81 static int 82 traverse_zil_block(zilog_t *zilog, blkptr_t *bp, void *arg, uint64_t claim_txg) 83 { 84 traverse_data_t *td = arg; 85 zbookmark_phys_t zb; 86 87 if (BP_IS_HOLE(bp)) 88 return (0); 89 90 if (claim_txg == 0 && bp->blk_birth >= spa_first_txg(td->td_spa)) 91 return (0); 92 93 SET_BOOKMARK(&zb, td->td_objset, ZB_ZIL_OBJECT, ZB_ZIL_LEVEL, 94 bp->blk_cksum.zc_word[ZIL_ZC_SEQ]); 95 96 (void) td->td_func(td->td_spa, zilog, bp, &zb, NULL, td->td_arg); 97 98 return (0); 99 } 100 101 static int 102 traverse_zil_record(zilog_t *zilog, lr_t *lrc, void *arg, uint64_t claim_txg) 103 { 104 traverse_data_t *td = arg; 105 106 if (lrc->lrc_txtype == TX_WRITE) { 107 lr_write_t *lr = (lr_write_t *)lrc; 108 blkptr_t *bp = &lr->lr_blkptr; 109 zbookmark_phys_t zb; 110 111 if (BP_IS_HOLE(bp)) 112 return (0); 113 114 if (claim_txg == 0 || bp->blk_birth < claim_txg) 115 return (0); 116 117 SET_BOOKMARK(&zb, td->td_objset, lr->lr_foid, 118 ZB_ZIL_LEVEL, lr->lr_offset / BP_GET_LSIZE(bp)); 119 120 (void) td->td_func(td->td_spa, zilog, bp, &zb, NULL, 121 td->td_arg); 122 } 123 return (0); 124 } 125 126 static void 127 traverse_zil(traverse_data_t *td, zil_header_t *zh) 128 { 129 uint64_t claim_txg = zh->zh_claim_txg; 130 zilog_t *zilog; 131 132 /* 133 * We only want to visit blocks that have been claimed but not yet 134 * replayed; plus, in read-only mode, blocks that are already stable. 135 */ 136 if (claim_txg == 0 && spa_writeable(td->td_spa)) 137 return; 138 139 zilog = zil_alloc(spa_get_dsl(td->td_spa)->dp_meta_objset, zh); 140 141 (void) zil_parse(zilog, traverse_zil_block, traverse_zil_record, td, 142 claim_txg); 143 144 zil_free(zilog); 145 } 146 147 typedef enum resume_skip { 148 RESUME_SKIP_ALL, 149 RESUME_SKIP_NONE, 150 RESUME_SKIP_CHILDREN 151 } resume_skip_t; 152 153 /* 154 * Returns RESUME_SKIP_ALL if td indicates that we are resuming a traversal and 155 * the block indicated by zb does not need to be visited at all. Returns 156 * RESUME_SKIP_CHILDREN if we are resuming a post traversal and we reach the 157 * resume point. This indicates that this block should be visited but not its 158 * children (since they must have been visited in a previous traversal). 159 * Otherwise returns RESUME_SKIP_NONE. 160 */ 161 static resume_skip_t 162 resume_skip_check(traverse_data_t *td, const dnode_phys_t *dnp, 163 const zbookmark_phys_t *zb) 164 { 165 if (td->td_resume != NULL && !ZB_IS_ZERO(td->td_resume)) { 166 /* 167 * If we already visited this bp & everything below, 168 * don't bother doing it again. 169 */ 170 if (zbookmark_subtree_completed(dnp, zb, td->td_resume)) 171 return (RESUME_SKIP_ALL); 172 173 /* 174 * If we found the block we're trying to resume from, zero 175 * the bookmark out to indicate that we have resumed. 176 */ 177 if (bcmp(zb, td->td_resume, sizeof (*zb)) == 0) { 178 bzero(td->td_resume, sizeof (*zb)); 179 if (td->td_flags & TRAVERSE_POST) 180 return (RESUME_SKIP_CHILDREN); 181 } 182 } 183 return (RESUME_SKIP_NONE); 184 } 185 186 static void 187 traverse_prefetch_metadata(traverse_data_t *td, 188 const blkptr_t *bp, const zbookmark_phys_t *zb) 189 { 190 arc_flags_t flags = ARC_FLAG_NOWAIT | ARC_FLAG_PREFETCH; 191 192 if (!(td->td_flags & TRAVERSE_PREFETCH_METADATA)) 193 return; 194 /* 195 * If we are in the process of resuming, don't prefetch, because 196 * some children will not be needed (and in fact may have already 197 * been freed). 198 */ 199 if (td->td_resume != NULL && !ZB_IS_ZERO(td->td_resume)) 200 return; 201 if (BP_IS_HOLE(bp) || bp->blk_birth <= td->td_min_txg) 202 return; 203 if (BP_GET_LEVEL(bp) == 0 && BP_GET_TYPE(bp) != DMU_OT_DNODE) 204 return; 205 206 (void) arc_read(NULL, td->td_spa, bp, NULL, NULL, 207 ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL, &flags, zb); 208 } 209 210 static boolean_t 211 prefetch_needed(prefetch_data_t *pfd, const blkptr_t *bp) 212 { 213 ASSERT(pfd->pd_flags & TRAVERSE_PREFETCH_DATA); 214 if (BP_IS_HOLE(bp) || BP_IS_EMBEDDED(bp) || 215 BP_GET_TYPE(bp) == DMU_OT_INTENT_LOG) 216 return (B_FALSE); 217 return (B_TRUE); 218 } 219 220 static int 221 traverse_visitbp(traverse_data_t *td, const dnode_phys_t *dnp, 222 const blkptr_t *bp, const zbookmark_phys_t *zb) 223 { 224 zbookmark_phys_t czb; 225 int err = 0; 226 arc_buf_t *buf = NULL; 227 prefetch_data_t *pd = td->td_pfd; 228 boolean_t hard = td->td_flags & TRAVERSE_HARD; 229 230 switch (resume_skip_check(td, dnp, zb)) { 231 case RESUME_SKIP_ALL: 232 return (0); 233 case RESUME_SKIP_CHILDREN: 234 goto post; 235 case RESUME_SKIP_NONE: 236 break; 237 default: 238 ASSERT(0); 239 } 240 241 if (bp->blk_birth == 0) { 242 /* 243 * Since this block has a birth time of 0 it must be one of 244 * two things: a hole created before the 245 * SPA_FEATURE_HOLE_BIRTH feature was enabled, or a hole 246 * which has always been a hole in an object. 247 * 248 * If a file is written sparsely, then the unwritten parts of 249 * the file were "always holes" -- that is, they have been 250 * holes since this object was allocated. However, we (and 251 * our callers) can not necessarily tell when an object was 252 * allocated. Therefore, if it's possible that this object 253 * was freed and then its object number reused, we need to 254 * visit all the holes with birth==0. 255 * 256 * If it isn't possible that the object number was reused, 257 * then if SPA_FEATURE_HOLE_BIRTH was enabled before we wrote 258 * all the blocks we will visit as part of this traversal, 259 * then this hole must have always existed, so we can skip 260 * it. We visit blocks born after (exclusive) td_min_txg. 261 * 262 * Note that the meta-dnode cannot be reallocated. 263 */ 264 if (!send_holes_without_birth_time && 265 (!td->td_realloc_possible || 266 zb->zb_object == DMU_META_DNODE_OBJECT) && 267 td->td_hole_birth_enabled_txg <= td->td_min_txg) 268 return (0); 269 } else if (bp->blk_birth <= td->td_min_txg) { 270 return (0); 271 } 272 273 if (pd != NULL && !pd->pd_exited && prefetch_needed(pd, bp)) { 274 uint64_t size = BP_GET_LSIZE(bp); 275 mutex_enter(&pd->pd_mtx); 276 ASSERT(pd->pd_bytes_fetched >= 0); 277 while (pd->pd_bytes_fetched < size && !pd->pd_exited) 278 cv_wait(&pd->pd_cv, &pd->pd_mtx); 279 pd->pd_bytes_fetched -= size; 280 cv_broadcast(&pd->pd_cv); 281 mutex_exit(&pd->pd_mtx); 282 } 283 284 if (BP_IS_HOLE(bp)) { 285 err = td->td_func(td->td_spa, NULL, bp, zb, dnp, td->td_arg); 286 if (err != 0) 287 goto post; 288 return (0); 289 } 290 291 if (td->td_flags & TRAVERSE_PRE) { 292 err = td->td_func(td->td_spa, NULL, bp, zb, dnp, 293 td->td_arg); 294 if (err == TRAVERSE_VISIT_NO_CHILDREN) 295 return (0); 296 if (err != 0) 297 goto post; 298 } 299 300 if (BP_GET_LEVEL(bp) > 0) { 301 arc_flags_t flags = ARC_FLAG_WAIT; 302 int i; 303 blkptr_t *cbp; 304 int epb = BP_GET_LSIZE(bp) >> SPA_BLKPTRSHIFT; 305 306 err = arc_read(NULL, td->td_spa, bp, arc_getbuf_func, &buf, 307 ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL, &flags, zb); 308 if (err != 0) 309 goto post; 310 cbp = buf->b_data; 311 312 for (i = 0; i < epb; i++) { 313 SET_BOOKMARK(&czb, zb->zb_objset, zb->zb_object, 314 zb->zb_level - 1, 315 zb->zb_blkid * epb + i); 316 traverse_prefetch_metadata(td, &cbp[i], &czb); 317 } 318 319 /* recursively visitbp() blocks below this */ 320 for (i = 0; i < epb; i++) { 321 SET_BOOKMARK(&czb, zb->zb_objset, zb->zb_object, 322 zb->zb_level - 1, 323 zb->zb_blkid * epb + i); 324 err = traverse_visitbp(td, dnp, &cbp[i], &czb); 325 if (err != 0) 326 break; 327 } 328 } else if (BP_GET_TYPE(bp) == DMU_OT_DNODE) { 329 arc_flags_t flags = ARC_FLAG_WAIT; 330 int i; 331 int epb = BP_GET_LSIZE(bp) >> DNODE_SHIFT; 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 dnode_phys_t *child_dnp = buf->b_data; 338 339 for (i = 0; i < epb; i++) { 340 prefetch_dnode_metadata(td, &child_dnp[i], 341 zb->zb_objset, zb->zb_blkid * epb + i); 342 } 343 344 /* recursively visitbp() blocks below this */ 345 for (i = 0; i < epb; i++) { 346 err = traverse_dnode(td, &child_dnp[i], 347 zb->zb_objset, zb->zb_blkid * epb + i); 348 if (err != 0) 349 break; 350 } 351 } else if (BP_GET_TYPE(bp) == DMU_OT_OBJSET) { 352 arc_flags_t flags = ARC_FLAG_WAIT; 353 354 err = arc_read(NULL, td->td_spa, bp, arc_getbuf_func, &buf, 355 ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL, &flags, zb); 356 if (err != 0) 357 goto post; 358 359 objset_phys_t *osp = buf->b_data; 360 prefetch_dnode_metadata(td, &osp->os_meta_dnode, zb->zb_objset, 361 DMU_META_DNODE_OBJECT); 362 /* 363 * See the block comment above for the goal of this variable. 364 * If the maxblkid of the meta-dnode is 0, then we know that 365 * we've never had more than DNODES_PER_BLOCK objects in the 366 * dataset, which means we can't have reused any object ids. 367 */ 368 if (osp->os_meta_dnode.dn_maxblkid == 0) 369 td->td_realloc_possible = B_FALSE; 370 371 if (arc_buf_size(buf) >= sizeof (objset_phys_t)) { 372 prefetch_dnode_metadata(td, &osp->os_groupused_dnode, 373 zb->zb_objset, DMU_GROUPUSED_OBJECT); 374 prefetch_dnode_metadata(td, &osp->os_userused_dnode, 375 zb->zb_objset, DMU_USERUSED_OBJECT); 376 } 377 378 err = traverse_dnode(td, &osp->os_meta_dnode, zb->zb_objset, 379 DMU_META_DNODE_OBJECT); 380 if (err == 0 && arc_buf_size(buf) >= sizeof (objset_phys_t)) { 381 err = traverse_dnode(td, &osp->os_groupused_dnode, 382 zb->zb_objset, DMU_GROUPUSED_OBJECT); 383 } 384 if (err == 0 && arc_buf_size(buf) >= sizeof (objset_phys_t)) { 385 err = traverse_dnode(td, &osp->os_userused_dnode, 386 zb->zb_objset, DMU_USERUSED_OBJECT); 387 } 388 } 389 390 if (buf) 391 arc_buf_destroy(buf, &buf); 392 393 post: 394 if (err == 0 && (td->td_flags & TRAVERSE_POST)) 395 err = td->td_func(td->td_spa, NULL, bp, zb, dnp, td->td_arg); 396 397 if (hard && (err == EIO || err == ECKSUM)) { 398 /* 399 * Ignore this disk error as requested by the HARD flag, 400 * and continue traversal. 401 */ 402 err = 0; 403 } 404 405 /* 406 * If we are stopping here, set td_resume. 407 */ 408 if (td->td_resume != NULL && err != 0 && !td->td_paused) { 409 td->td_resume->zb_objset = zb->zb_objset; 410 td->td_resume->zb_object = zb->zb_object; 411 td->td_resume->zb_level = 0; 412 /* 413 * If we have stopped on an indirect block (e.g. due to 414 * i/o error), we have not visited anything below it. 415 * Set the bookmark to the first level-0 block that we need 416 * to visit. This way, the resuming code does not need to 417 * deal with resuming from indirect blocks. 418 * 419 * Note, if zb_level <= 0, dnp may be NULL, so we don't want 420 * to dereference it. 421 */ 422 td->td_resume->zb_blkid = zb->zb_blkid; 423 if (zb->zb_level > 0) { 424 td->td_resume->zb_blkid <<= zb->zb_level * 425 (dnp->dn_indblkshift - SPA_BLKPTRSHIFT); 426 } 427 td->td_paused = B_TRUE; 428 } 429 430 return (err); 431 } 432 433 static void 434 prefetch_dnode_metadata(traverse_data_t *td, const dnode_phys_t *dnp, 435 uint64_t objset, uint64_t object) 436 { 437 int j; 438 zbookmark_phys_t czb; 439 440 for (j = 0; j < dnp->dn_nblkptr; j++) { 441 SET_BOOKMARK(&czb, objset, object, dnp->dn_nlevels - 1, j); 442 traverse_prefetch_metadata(td, &dnp->dn_blkptr[j], &czb); 443 } 444 445 if (dnp->dn_flags & DNODE_FLAG_SPILL_BLKPTR) { 446 SET_BOOKMARK(&czb, objset, object, 0, DMU_SPILL_BLKID); 447 traverse_prefetch_metadata(td, &dnp->dn_spill, &czb); 448 } 449 } 450 451 static int 452 traverse_dnode(traverse_data_t *td, const dnode_phys_t *dnp, 453 uint64_t objset, uint64_t object) 454 { 455 int j, err = 0; 456 zbookmark_phys_t czb; 457 458 if (object != DMU_META_DNODE_OBJECT && td->td_resume != NULL && 459 object < td->td_resume->zb_object) 460 return (0); 461 462 if (td->td_flags & TRAVERSE_PRE) { 463 SET_BOOKMARK(&czb, objset, object, ZB_DNODE_LEVEL, 464 ZB_DNODE_BLKID); 465 err = td->td_func(td->td_spa, NULL, NULL, &czb, dnp, 466 td->td_arg); 467 if (err == TRAVERSE_VISIT_NO_CHILDREN) 468 return (0); 469 if (err != 0) 470 return (err); 471 } 472 473 for (j = 0; j < dnp->dn_nblkptr; j++) { 474 SET_BOOKMARK(&czb, objset, object, dnp->dn_nlevels - 1, j); 475 err = traverse_visitbp(td, dnp, &dnp->dn_blkptr[j], &czb); 476 if (err != 0) 477 break; 478 } 479 480 if (err == 0 && (dnp->dn_flags & DNODE_FLAG_SPILL_BLKPTR)) { 481 SET_BOOKMARK(&czb, objset, object, 0, DMU_SPILL_BLKID); 482 err = traverse_visitbp(td, dnp, &dnp->dn_spill, &czb); 483 } 484 485 if (err == 0 && (td->td_flags & TRAVERSE_POST)) { 486 SET_BOOKMARK(&czb, objset, object, ZB_DNODE_LEVEL, 487 ZB_DNODE_BLKID); 488 err = td->td_func(td->td_spa, NULL, NULL, &czb, dnp, 489 td->td_arg); 490 if (err == TRAVERSE_VISIT_NO_CHILDREN) 491 return (0); 492 if (err != 0) 493 return (err); 494 } 495 return (err); 496 } 497 498 /* ARGSUSED */ 499 static int 500 traverse_prefetcher(spa_t *spa, zilog_t *zilog, const blkptr_t *bp, 501 const zbookmark_phys_t *zb, const dnode_phys_t *dnp, void *arg) 502 { 503 prefetch_data_t *pfd = arg; 504 arc_flags_t aflags = ARC_FLAG_NOWAIT | ARC_FLAG_PREFETCH; 505 506 ASSERT(pfd->pd_bytes_fetched >= 0); 507 if (bp == NULL) 508 return (0); 509 if (pfd->pd_cancel) 510 return (SET_ERROR(EINTR)); 511 512 if (!prefetch_needed(pfd, bp)) 513 return (0); 514 515 mutex_enter(&pfd->pd_mtx); 516 while (!pfd->pd_cancel && pfd->pd_bytes_fetched >= zfs_pd_bytes_max) 517 cv_wait(&pfd->pd_cv, &pfd->pd_mtx); 518 pfd->pd_bytes_fetched += BP_GET_LSIZE(bp); 519 cv_broadcast(&pfd->pd_cv); 520 mutex_exit(&pfd->pd_mtx); 521 522 (void) arc_read(NULL, spa, bp, NULL, NULL, ZIO_PRIORITY_ASYNC_READ, 523 ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE, &aflags, zb); 524 525 return (0); 526 } 527 528 static void 529 traverse_prefetch_thread(void *arg) 530 { 531 traverse_data_t *td_main = arg; 532 traverse_data_t td = *td_main; 533 zbookmark_phys_t czb; 534 535 td.td_func = traverse_prefetcher; 536 td.td_arg = td_main->td_pfd; 537 td.td_pfd = NULL; 538 td.td_resume = &td_main->td_pfd->pd_resume; 539 540 SET_BOOKMARK(&czb, td.td_objset, 541 ZB_ROOT_OBJECT, ZB_ROOT_LEVEL, ZB_ROOT_BLKID); 542 (void) traverse_visitbp(&td, NULL, td.td_rootbp, &czb); 543 544 mutex_enter(&td_main->td_pfd->pd_mtx); 545 td_main->td_pfd->pd_exited = B_TRUE; 546 cv_broadcast(&td_main->td_pfd->pd_cv); 547 mutex_exit(&td_main->td_pfd->pd_mtx); 548 } 549 550 /* 551 * NB: dataset must not be changing on-disk (eg, is a snapshot or we are 552 * in syncing context). 553 */ 554 static int 555 traverse_impl(spa_t *spa, dsl_dataset_t *ds, uint64_t objset, blkptr_t *rootbp, 556 uint64_t txg_start, zbookmark_phys_t *resume, int flags, 557 blkptr_cb_t func, void *arg) 558 { 559 traverse_data_t td; 560 prefetch_data_t pd = { 0 }; 561 zbookmark_phys_t czb; 562 int err; 563 564 ASSERT(ds == NULL || objset == ds->ds_object); 565 ASSERT(!(flags & TRAVERSE_PRE) || !(flags & TRAVERSE_POST)); 566 567 td.td_spa = spa; 568 td.td_objset = objset; 569 td.td_rootbp = rootbp; 570 td.td_min_txg = txg_start; 571 td.td_resume = resume; 572 td.td_func = func; 573 td.td_arg = arg; 574 td.td_pfd = &pd; 575 td.td_flags = flags; 576 td.td_paused = B_FALSE; 577 td.td_realloc_possible = (txg_start == 0 ? B_FALSE : B_TRUE); 578 579 if (spa_feature_is_active(spa, SPA_FEATURE_HOLE_BIRTH)) { 580 VERIFY(spa_feature_enabled_txg(spa, 581 SPA_FEATURE_HOLE_BIRTH, &td.td_hole_birth_enabled_txg)); 582 } else { 583 td.td_hole_birth_enabled_txg = UINT64_MAX; 584 } 585 586 pd.pd_flags = flags; 587 if (resume != NULL) 588 pd.pd_resume = *resume; 589 mutex_init(&pd.pd_mtx, NULL, MUTEX_DEFAULT, NULL); 590 cv_init(&pd.pd_cv, NULL, CV_DEFAULT, NULL); 591 592 /* See comment on ZIL traversal in dsl_scan_visitds. */ 593 if (ds != NULL && !ds->ds_is_snapshot && !BP_IS_HOLE(rootbp)) { 594 arc_flags_t flags = ARC_FLAG_WAIT; 595 objset_phys_t *osp; 596 arc_buf_t *buf; 597 598 err = arc_read(NULL, td.td_spa, rootbp, 599 arc_getbuf_func, &buf, 600 ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL, &flags, NULL); 601 if (err != 0) 602 return (err); 603 604 osp = buf->b_data; 605 traverse_zil(&td, &osp->os_zil_header); 606 arc_buf_destroy(buf, &buf); 607 } 608 609 if (!(flags & TRAVERSE_PREFETCH_DATA) || 610 0 == taskq_dispatch(system_taskq, traverse_prefetch_thread, 611 &td, TQ_NOQUEUE)) 612 pd.pd_exited = B_TRUE; 613 614 SET_BOOKMARK(&czb, td.td_objset, 615 ZB_ROOT_OBJECT, ZB_ROOT_LEVEL, ZB_ROOT_BLKID); 616 err = traverse_visitbp(&td, NULL, rootbp, &czb); 617 618 mutex_enter(&pd.pd_mtx); 619 pd.pd_cancel = B_TRUE; 620 cv_broadcast(&pd.pd_cv); 621 while (!pd.pd_exited) 622 cv_wait(&pd.pd_cv, &pd.pd_mtx); 623 mutex_exit(&pd.pd_mtx); 624 625 mutex_destroy(&pd.pd_mtx); 626 cv_destroy(&pd.pd_cv); 627 628 return (err); 629 } 630 631 /* 632 * NB: dataset must not be changing on-disk (eg, is a snapshot or we are 633 * in syncing context). 634 */ 635 int 636 traverse_dataset_resume(dsl_dataset_t *ds, uint64_t txg_start, 637 zbookmark_phys_t *resume, 638 int flags, blkptr_cb_t func, void *arg) 639 { 640 return (traverse_impl(ds->ds_dir->dd_pool->dp_spa, ds, ds->ds_object, 641 &dsl_dataset_phys(ds)->ds_bp, txg_start, resume, flags, func, arg)); 642 } 643 644 int 645 traverse_dataset(dsl_dataset_t *ds, uint64_t txg_start, 646 int flags, blkptr_cb_t func, void *arg) 647 { 648 return (traverse_dataset_resume(ds, txg_start, NULL, flags, func, arg)); 649 } 650 651 int 652 traverse_dataset_destroyed(spa_t *spa, blkptr_t *blkptr, 653 uint64_t txg_start, zbookmark_phys_t *resume, int flags, 654 blkptr_cb_t func, void *arg) 655 { 656 return (traverse_impl(spa, NULL, ZB_DESTROYED_OBJSET, 657 blkptr, txg_start, resume, flags, func, arg)); 658 } 659 660 /* 661 * NB: pool must not be changing on-disk (eg, from zdb or sync context). 662 */ 663 int 664 traverse_pool(spa_t *spa, uint64_t txg_start, int flags, 665 blkptr_cb_t func, void *arg) 666 { 667 int err; 668 dsl_pool_t *dp = spa_get_dsl(spa); 669 objset_t *mos = dp->dp_meta_objset; 670 boolean_t hard = (flags & TRAVERSE_HARD); 671 672 /* visit the MOS */ 673 err = traverse_impl(spa, NULL, 0, spa_get_rootblkptr(spa), 674 txg_start, NULL, flags, func, arg); 675 if (err != 0) 676 return (err); 677 678 /* visit each dataset */ 679 for (uint64_t obj = 1; err == 0; 680 err = dmu_object_next(mos, &obj, B_FALSE, txg_start)) { 681 dmu_object_info_t doi; 682 683 err = dmu_object_info(mos, obj, &doi); 684 if (err != 0) { 685 if (hard) 686 continue; 687 break; 688 } 689 690 if (doi.doi_bonus_type == DMU_OT_DSL_DATASET) { 691 dsl_dataset_t *ds; 692 uint64_t txg = txg_start; 693 694 dsl_pool_config_enter(dp, FTAG); 695 err = dsl_dataset_hold_obj(dp, obj, FTAG, &ds); 696 dsl_pool_config_exit(dp, FTAG); 697 if (err != 0) { 698 if (hard) 699 continue; 700 break; 701 } 702 if (dsl_dataset_phys(ds)->ds_prev_snap_txg > txg) 703 txg = dsl_dataset_phys(ds)->ds_prev_snap_txg; 704 err = traverse_dataset(ds, txg, flags, func, arg); 705 dsl_dataset_rele(ds, FTAG); 706 if (err != 0) 707 break; 708 } 709 } 710 if (err == ESRCH) 711 err = 0; 712 return (err); 713 } 714
Indexes created Sat Jun 27 00:24:51 UTC 2026