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5056 ZFS deadlock on db_mtx and dn_holds
Reviewed by: Will Andrews <willa@spectralogic.com>
Reviewed by: Matt Ahrens <mahrens@delphix.com>
Reviewed by: George Wilson <george.wilson@delphix.com>
Approved by: Dan McDonald <danmcd@omniti.com>
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--- old/usr/src/uts/common/fs/zfs/dmu_traverse.c
+++ new/usr/src/uts/common/fs/zfs/dmu_traverse.c
1 1 /*
2 2 * CDDL HEADER START
3 3 *
4 4 * The contents of this file are subject to the terms of the
5 5 * Common Development and Distribution License (the "License").
6 6 * You may not use this file except in compliance with the License.
7 7 *
8 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 9 * or http://www.opensolaris.org/os/licensing.
10 10 * See the License for the specific language governing permissions
11 11 * and limitations under the License.
12 12 *
13 13 * When distributing Covered Code, include this CDDL HEADER in each
14 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 15 * If applicable, add the following below this CDDL HEADER, with the
16 16 * fields enclosed by brackets "[]" replaced with your own identifying
17 17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 18 *
19 19 * CDDL HEADER END
20 20 */
21 21 /*
22 22 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
23 23 * Copyright (c) 2012, 2014 by Delphix. All rights reserved.
24 24 */
25 25
26 26 #include <sys/zfs_context.h>
27 27 #include <sys/dmu_objset.h>
28 28 #include <sys/dmu_traverse.h>
29 29 #include <sys/dsl_dataset.h>
30 30 #include <sys/dsl_dir.h>
31 31 #include <sys/dsl_pool.h>
32 32 #include <sys/dnode.h>
33 33 #include <sys/spa.h>
34 34 #include <sys/zio.h>
35 35 #include <sys/dmu_impl.h>
36 36 #include <sys/sa.h>
37 37 #include <sys/sa_impl.h>
38 38 #include <sys/callb.h>
39 39 #include <sys/zfeature.h>
40 40
41 41 int zfs_pd_blks_max = 100;
42 42
43 43 typedef struct prefetch_data {
44 44 kmutex_t pd_mtx;
45 45 kcondvar_t pd_cv;
46 46 int pd_blks_max;
47 47 int pd_blks_fetched;
48 48 int pd_flags;
49 49 boolean_t pd_cancel;
50 50 boolean_t pd_exited;
51 51 } prefetch_data_t;
52 52
53 53 typedef struct traverse_data {
54 54 spa_t *td_spa;
55 55 uint64_t td_objset;
56 56 blkptr_t *td_rootbp;
57 57 uint64_t td_min_txg;
58 58 zbookmark_phys_t *td_resume;
59 59 int td_flags;
60 60 prefetch_data_t *td_pfd;
61 61 boolean_t td_paused;
62 62 uint64_t td_hole_birth_enabled_txg;
63 63 blkptr_cb_t *td_func;
64 64 void *td_arg;
65 65 } traverse_data_t;
66 66
67 67 static int traverse_dnode(traverse_data_t *td, const dnode_phys_t *dnp,
68 68 uint64_t objset, uint64_t object);
69 69 static void prefetch_dnode_metadata(traverse_data_t *td, const dnode_phys_t *,
70 70 uint64_t objset, uint64_t object);
71 71
72 72 static int
73 73 traverse_zil_block(zilog_t *zilog, blkptr_t *bp, void *arg, uint64_t claim_txg)
74 74 {
75 75 traverse_data_t *td = arg;
76 76 zbookmark_phys_t zb;
77 77
78 78 if (BP_IS_HOLE(bp))
79 79 return (0);
80 80
81 81 if (claim_txg == 0 && bp->blk_birth >= spa_first_txg(td->td_spa))
82 82 return (0);
83 83
84 84 SET_BOOKMARK(&zb, td->td_objset, ZB_ZIL_OBJECT, ZB_ZIL_LEVEL,
85 85 bp->blk_cksum.zc_word[ZIL_ZC_SEQ]);
86 86
87 87 (void) td->td_func(td->td_spa, zilog, bp, &zb, NULL, td->td_arg);
88 88
89 89 return (0);
90 90 }
91 91
92 92 static int
93 93 traverse_zil_record(zilog_t *zilog, lr_t *lrc, void *arg, uint64_t claim_txg)
94 94 {
95 95 traverse_data_t *td = arg;
96 96
97 97 if (lrc->lrc_txtype == TX_WRITE) {
98 98 lr_write_t *lr = (lr_write_t *)lrc;
99 99 blkptr_t *bp = &lr->lr_blkptr;
100 100 zbookmark_phys_t zb;
101 101
102 102 if (BP_IS_HOLE(bp))
103 103 return (0);
104 104
105 105 if (claim_txg == 0 || bp->blk_birth < claim_txg)
106 106 return (0);
107 107
108 108 SET_BOOKMARK(&zb, td->td_objset, lr->lr_foid,
109 109 ZB_ZIL_LEVEL, lr->lr_offset / BP_GET_LSIZE(bp));
110 110
111 111 (void) td->td_func(td->td_spa, zilog, bp, &zb, NULL,
112 112 td->td_arg);
113 113 }
114 114 return (0);
115 115 }
116 116
117 117 static void
118 118 traverse_zil(traverse_data_t *td, zil_header_t *zh)
119 119 {
120 120 uint64_t claim_txg = zh->zh_claim_txg;
121 121 zilog_t *zilog;
122 122
123 123 /*
124 124 * We only want to visit blocks that have been claimed but not yet
125 125 * replayed; plus, in read-only mode, blocks that are already stable.
126 126 */
127 127 if (claim_txg == 0 && spa_writeable(td->td_spa))
128 128 return;
129 129
130 130 zilog = zil_alloc(spa_get_dsl(td->td_spa)->dp_meta_objset, zh);
131 131
132 132 (void) zil_parse(zilog, traverse_zil_block, traverse_zil_record, td,
133 133 claim_txg);
134 134
135 135 zil_free(zilog);
136 136 }
137 137
138 138 typedef enum resume_skip {
139 139 RESUME_SKIP_ALL,
140 140 RESUME_SKIP_NONE,
141 141 RESUME_SKIP_CHILDREN
142 142 } resume_skip_t;
143 143
144 144 /*
145 145 * Returns RESUME_SKIP_ALL if td indicates that we are resuming a traversal and
146 146 * the block indicated by zb does not need to be visited at all. Returns
147 147 * RESUME_SKIP_CHILDREN if we are resuming a post traversal and we reach the
148 148 * resume point. This indicates that this block should be visited but not its
149 149 * children (since they must have been visited in a previous traversal).
150 150 * Otherwise returns RESUME_SKIP_NONE.
151 151 */
152 152 static resume_skip_t
153 153 resume_skip_check(traverse_data_t *td, const dnode_phys_t *dnp,
154 154 const zbookmark_phys_t *zb)
155 155 {
156 156 if (td->td_resume != NULL && !ZB_IS_ZERO(td->td_resume)) {
157 157 /*
158 158 * If we already visited this bp & everything below,
159 159 * don't bother doing it again.
160 160 */
161 161 if (zbookmark_is_before(dnp, zb, td->td_resume))
162 162 return (RESUME_SKIP_ALL);
163 163
164 164 /*
165 165 * If we found the block we're trying to resume from, zero
166 166 * the bookmark out to indicate that we have resumed.
167 167 */
168 168 if (bcmp(zb, td->td_resume, sizeof (*zb)) == 0) {
169 169 bzero(td->td_resume, sizeof (*zb));
170 170 if (td->td_flags & TRAVERSE_POST)
171 171 return (RESUME_SKIP_CHILDREN);
172 172 }
173 173 }
174 174 return (RESUME_SKIP_NONE);
175 175 }
176 176
177 177 static void
178 178 traverse_prefetch_metadata(traverse_data_t *td,
179 179 const blkptr_t *bp, const zbookmark_phys_t *zb)
180 180 {
181 181 arc_flags_t flags = ARC_FLAG_NOWAIT | ARC_FLAG_PREFETCH;
182 182
183 183 if (!(td->td_flags & TRAVERSE_PREFETCH_METADATA))
184 184 return;
185 185 /*
186 186 * If we are in the process of resuming, don't prefetch, because
187 187 * some children will not be needed (and in fact may have already
188 188 * been freed).
189 189 */
190 190 if (td->td_resume != NULL && !ZB_IS_ZERO(td->td_resume))
191 191 return;
192 192 if (BP_IS_HOLE(bp) || bp->blk_birth <= td->td_min_txg)
193 193 return;
194 194 if (BP_GET_LEVEL(bp) == 0 && BP_GET_TYPE(bp) != DMU_OT_DNODE)
195 195 return;
196 196
197 197 (void) arc_read(NULL, td->td_spa, bp, NULL, NULL,
198 198 ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL, &flags, zb);
199 199 }
200 200
201 201 static boolean_t
202 202 prefetch_needed(prefetch_data_t *pfd, const blkptr_t *bp)
203 203 {
204 204 ASSERT(pfd->pd_flags & TRAVERSE_PREFETCH_DATA);
205 205 if (BP_IS_HOLE(bp) || BP_IS_EMBEDDED(bp) ||
206 206 BP_GET_TYPE(bp) == DMU_OT_INTENT_LOG)
207 207 return (B_FALSE);
208 208 return (B_TRUE);
209 209 }
210 210
211 211 static int
212 212 traverse_visitbp(traverse_data_t *td, const dnode_phys_t *dnp,
213 213 const blkptr_t *bp, const zbookmark_phys_t *zb)
214 214 {
215 215 zbookmark_phys_t czb;
216 216 int err = 0;
217 217 arc_buf_t *buf = NULL;
218 218 prefetch_data_t *pd = td->td_pfd;
219 219 boolean_t hard = td->td_flags & TRAVERSE_HARD;
220 220
221 221 switch (resume_skip_check(td, dnp, zb)) {
222 222 case RESUME_SKIP_ALL:
223 223 return (0);
224 224 case RESUME_SKIP_CHILDREN:
225 225 goto post;
226 226 case RESUME_SKIP_NONE:
227 227 break;
228 228 default:
229 229 ASSERT(0);
230 230 }
231 231
232 232 if (bp->blk_birth == 0) {
233 233 /*
234 234 * Since this block has a birth time of 0 it must be a
235 235 * hole created before the SPA_FEATURE_HOLE_BIRTH
236 236 * feature was enabled. If SPA_FEATURE_HOLE_BIRTH
237 237 * was enabled before the min_txg for this traveral we
238 238 * know the hole must have been created before the
239 239 * min_txg for this traveral, so we can skip it. If
240 240 * SPA_FEATURE_HOLE_BIRTH was enabled after the min_txg
241 241 * for this traveral we cannot tell if the hole was
242 242 * created before or after the min_txg for this
243 243 * traversal, so we cannot skip it.
244 244 */
245 245 if (td->td_hole_birth_enabled_txg < td->td_min_txg)
246 246 return (0);
247 247 } else if (bp->blk_birth <= td->td_min_txg) {
248 248 return (0);
249 249 }
250 250
251 251 if (pd != NULL && !pd->pd_exited && prefetch_needed(pd, bp)) {
252 252 mutex_enter(&pd->pd_mtx);
253 253 ASSERT(pd->pd_blks_fetched >= 0);
254 254 while (pd->pd_blks_fetched == 0 && !pd->pd_exited)
255 255 cv_wait(&pd->pd_cv, &pd->pd_mtx);
256 256 pd->pd_blks_fetched--;
257 257 cv_broadcast(&pd->pd_cv);
258 258 mutex_exit(&pd->pd_mtx);
259 259 }
260 260
261 261 if (BP_IS_HOLE(bp)) {
262 262 err = td->td_func(td->td_spa, NULL, bp, zb, dnp, td->td_arg);
263 263 if (err != 0)
264 264 goto post;
265 265 return (0);
266 266 }
267 267
268 268 if (td->td_flags & TRAVERSE_PRE) {
269 269 err = td->td_func(td->td_spa, NULL, bp, zb, dnp,
270 270 td->td_arg);
271 271 if (err == TRAVERSE_VISIT_NO_CHILDREN)
272 272 return (0);
273 273 if (err != 0)
274 274 goto post;
275 275 }
276 276
277 277 if (BP_GET_LEVEL(bp) > 0) {
278 278 arc_flags_t flags = ARC_FLAG_WAIT;
279 279 int i;
280 280 blkptr_t *cbp;
281 281 int epb = BP_GET_LSIZE(bp) >> SPA_BLKPTRSHIFT;
282 282
283 283 err = arc_read(NULL, td->td_spa, bp, arc_getbuf_func, &buf,
284 284 ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL, &flags, zb);
285 285 if (err != 0)
286 286 goto post;
287 287 cbp = buf->b_data;
288 288
289 289 for (i = 0; i < epb; i++) {
290 290 SET_BOOKMARK(&czb, zb->zb_objset, zb->zb_object,
291 291 zb->zb_level - 1,
292 292 zb->zb_blkid * epb + i);
293 293 traverse_prefetch_metadata(td, &cbp[i], &czb);
294 294 }
295 295
296 296 /* recursively visitbp() blocks below this */
297 297 for (i = 0; i < epb; i++) {
298 298 SET_BOOKMARK(&czb, zb->zb_objset, zb->zb_object,
299 299 zb->zb_level - 1,
300 300 zb->zb_blkid * epb + i);
301 301 err = traverse_visitbp(td, dnp, &cbp[i], &czb);
302 302 if (err != 0)
303 303 break;
304 304 }
305 305 } else if (BP_GET_TYPE(bp) == DMU_OT_DNODE) {
306 306 arc_flags_t flags = ARC_FLAG_WAIT;
307 307 int i;
308 308 int epb = BP_GET_LSIZE(bp) >> DNODE_SHIFT;
309 309
310 310 err = arc_read(NULL, td->td_spa, bp, arc_getbuf_func, &buf,
311 311 ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL, &flags, zb);
312 312 if (err != 0)
313 313 goto post;
314 314 dnp = buf->b_data;
315 315
316 316 for (i = 0; i < epb; i++) {
317 317 prefetch_dnode_metadata(td, &dnp[i], zb->zb_objset,
318 318 zb->zb_blkid * epb + i);
319 319 }
320 320
321 321 /* recursively visitbp() blocks below this */
322 322 for (i = 0; i < epb; i++) {
323 323 err = traverse_dnode(td, &dnp[i], zb->zb_objset,
324 324 zb->zb_blkid * epb + i);
325 325 if (err != 0)
326 326 break;
327 327 }
328 328 } else if (BP_GET_TYPE(bp) == DMU_OT_OBJSET) {
329 329 arc_flags_t flags = ARC_FLAG_WAIT;
330 330 objset_phys_t *osp;
331 331 dnode_phys_t *dnp;
332 332
333 333 err = arc_read(NULL, td->td_spa, bp, arc_getbuf_func, &buf,
334 334 ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL, &flags, zb);
335 335 if (err != 0)
336 336 goto post;
337 337
338 338 osp = buf->b_data;
339 339 dnp = &osp->os_meta_dnode;
340 340 prefetch_dnode_metadata(td, dnp, zb->zb_objset,
341 341 DMU_META_DNODE_OBJECT);
342 342 if (arc_buf_size(buf) >= sizeof (objset_phys_t)) {
343 343 prefetch_dnode_metadata(td, &osp->os_groupused_dnode,
344 344 zb->zb_objset, DMU_GROUPUSED_OBJECT);
345 345 prefetch_dnode_metadata(td, &osp->os_userused_dnode,
346 346 zb->zb_objset, DMU_USERUSED_OBJECT);
347 347 }
348 348
349 349 err = traverse_dnode(td, dnp, zb->zb_objset,
350 350 DMU_META_DNODE_OBJECT);
351 351 if (err == 0 && arc_buf_size(buf) >= sizeof (objset_phys_t)) {
352 352 dnp = &osp->os_groupused_dnode;
353 353 err = traverse_dnode(td, dnp, zb->zb_objset,
354 354 DMU_GROUPUSED_OBJECT);
355 355 }
356 356 if (err == 0 && arc_buf_size(buf) >= sizeof (objset_phys_t)) {
357 357 dnp = &osp->os_userused_dnode;
358 358 err = traverse_dnode(td, dnp, zb->zb_objset,
359 359 DMU_USERUSED_OBJECT);
360 360 }
361 361 }
362 362
363 363 if (buf)
364 364 (void) arc_buf_remove_ref(buf, &buf);
365 365
366 366 post:
367 367 if (err == 0 && (td->td_flags & TRAVERSE_POST))
368 368 err = td->td_func(td->td_spa, NULL, bp, zb, dnp, td->td_arg);
369 369
370 370 if (hard && (err == EIO || err == ECKSUM)) {
371 371 /*
372 372 * Ignore this disk error as requested by the HARD flag,
373 373 * and continue traversal.
374 374 */
375 375 err = 0;
376 376 }
377 377
378 378 /*
379 379 * If we are stopping here, set td_resume.
380 380 */
381 381 if (td->td_resume != NULL && err != 0 && !td->td_paused) {
382 382 td->td_resume->zb_objset = zb->zb_objset;
383 383 td->td_resume->zb_object = zb->zb_object;
384 384 td->td_resume->zb_level = 0;
385 385 /*
386 386 * If we have stopped on an indirect block (e.g. due to
387 387 * i/o error), we have not visited anything below it.
388 388 * Set the bookmark to the first level-0 block that we need
389 389 * to visit. This way, the resuming code does not need to
390 390 * deal with resuming from indirect blocks.
391 391 */
392 392 td->td_resume->zb_blkid = zb->zb_blkid <<
393 393 (zb->zb_level * (dnp->dn_indblkshift - SPA_BLKPTRSHIFT));
394 394 td->td_paused = B_TRUE;
395 395 }
396 396
397 397 return (err);
398 398 }
399 399
400 400 static void
401 401 prefetch_dnode_metadata(traverse_data_t *td, const dnode_phys_t *dnp,
402 402 uint64_t objset, uint64_t object)
403 403 {
404 404 int j;
405 405 zbookmark_phys_t czb;
406 406
407 407 for (j = 0; j < dnp->dn_nblkptr; j++) {
408 408 SET_BOOKMARK(&czb, objset, object, dnp->dn_nlevels - 1, j);
409 409 traverse_prefetch_metadata(td, &dnp->dn_blkptr[j], &czb);
410 410 }
411 411
412 412 if (dnp->dn_flags & DNODE_FLAG_SPILL_BLKPTR) {
413 413 SET_BOOKMARK(&czb, objset, object, 0, DMU_SPILL_BLKID);
414 414 traverse_prefetch_metadata(td, &dnp->dn_spill, &czb);
415 415 }
416 416 }
417 417
418 418 static int
419 419 traverse_dnode(traverse_data_t *td, const dnode_phys_t *dnp,
420 420 uint64_t objset, uint64_t object)
421 421 {
422 422 int j, err = 0;
423 423 zbookmark_phys_t czb;
424 424
425 425 for (j = 0; j < dnp->dn_nblkptr; j++) {
426 426 SET_BOOKMARK(&czb, objset, object, dnp->dn_nlevels - 1, j);
427 427 err = traverse_visitbp(td, dnp, &dnp->dn_blkptr[j], &czb);
428 428 if (err != 0)
429 429 break;
430 430 }
431 431
432 432 if (err == 0 && dnp->dn_flags & DNODE_FLAG_SPILL_BLKPTR) {
433 433 SET_BOOKMARK(&czb, objset, object, 0, DMU_SPILL_BLKID);
434 434 err = traverse_visitbp(td, dnp, &dnp->dn_spill, &czb);
435 435 }
436 436 return (err);
437 437 }
438 438
439 439 /* ARGSUSED */
440 440 static int
441 441 traverse_prefetcher(spa_t *spa, zilog_t *zilog, const blkptr_t *bp,
442 442 const zbookmark_phys_t *zb, const dnode_phys_t *dnp, void *arg)
443 443 {
444 444 prefetch_data_t *pfd = arg;
445 445 arc_flags_t aflags = ARC_FLAG_NOWAIT | ARC_FLAG_PREFETCH;
446 446
447 447 ASSERT(pfd->pd_blks_fetched >= 0);
448 448 if (pfd->pd_cancel)
449 449 return (SET_ERROR(EINTR));
450 450
451 451 if (!prefetch_needed(pfd, bp))
452 452 return (0);
453 453
454 454 mutex_enter(&pfd->pd_mtx);
455 455 while (!pfd->pd_cancel && pfd->pd_blks_fetched >= pfd->pd_blks_max)
456 456 cv_wait(&pfd->pd_cv, &pfd->pd_mtx);
457 457 pfd->pd_blks_fetched++;
458 458 cv_broadcast(&pfd->pd_cv);
459 459 mutex_exit(&pfd->pd_mtx);
460 460
461 461 (void) arc_read(NULL, spa, bp, NULL, NULL, ZIO_PRIORITY_ASYNC_READ,
462 462 ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE, &aflags, zb);
463 463
464 464 return (0);
465 465 }
466 466
467 467 static void
468 468 traverse_prefetch_thread(void *arg)
469 469 {
470 470 traverse_data_t *td_main = arg;
471 471 traverse_data_t td = *td_main;
472 472 zbookmark_phys_t czb;
473 473
474 474 td.td_func = traverse_prefetcher;
475 475 td.td_arg = td_main->td_pfd;
476 476 td.td_pfd = NULL;
477 477
478 478 SET_BOOKMARK(&czb, td.td_objset,
479 479 ZB_ROOT_OBJECT, ZB_ROOT_LEVEL, ZB_ROOT_BLKID);
480 480 (void) traverse_visitbp(&td, NULL, td.td_rootbp, &czb);
481 481
482 482 mutex_enter(&td_main->td_pfd->pd_mtx);
483 483 td_main->td_pfd->pd_exited = B_TRUE;
484 484 cv_broadcast(&td_main->td_pfd->pd_cv);
485 485 mutex_exit(&td_main->td_pfd->pd_mtx);
486 486 }
487 487
488 488 /*
489 489 * NB: dataset must not be changing on-disk (eg, is a snapshot or we are
490 490 * in syncing context).
491 491 */
492 492 static int
493 493 traverse_impl(spa_t *spa, dsl_dataset_t *ds, uint64_t objset, blkptr_t *rootbp,
494 494 uint64_t txg_start, zbookmark_phys_t *resume, int flags,
495 495 blkptr_cb_t func, void *arg)
496 496 {
497 497 traverse_data_t td;
498 498 prefetch_data_t pd = { 0 };
499 499 zbookmark_phys_t czb;
500 500 int err;
501 501
502 502 ASSERT(ds == NULL || objset == ds->ds_object);
503 503 ASSERT(!(flags & TRAVERSE_PRE) || !(flags & TRAVERSE_POST));
504 504
505 505 /*
506 506 * The data prefetching mechanism (the prefetch thread) is incompatible
507 507 * with resuming from a bookmark.
508 508 */
509 509 ASSERT(resume == NULL || !(flags & TRAVERSE_PREFETCH_DATA));
510 510
511 511 td.td_spa = spa;
512 512 td.td_objset = objset;
513 513 td.td_rootbp = rootbp;
514 514 td.td_min_txg = txg_start;
515 515 td.td_resume = resume;
516 516 td.td_func = func;
517 517 td.td_arg = arg;
518 518 td.td_pfd = &pd;
519 519 td.td_flags = flags;
520 520 td.td_paused = B_FALSE;
521 521
522 522 if (spa_feature_is_active(spa, SPA_FEATURE_HOLE_BIRTH)) {
523 523 VERIFY(spa_feature_enabled_txg(spa,
524 524 SPA_FEATURE_HOLE_BIRTH, &td.td_hole_birth_enabled_txg));
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525 525 } else {
526 526 td.td_hole_birth_enabled_txg = 0;
527 527 }
528 528
529 529 pd.pd_blks_max = zfs_pd_blks_max;
530 530 pd.pd_flags = flags;
531 531 mutex_init(&pd.pd_mtx, NULL, MUTEX_DEFAULT, NULL);
532 532 cv_init(&pd.pd_cv, NULL, CV_DEFAULT, NULL);
533 533
534 534 /* See comment on ZIL traversal in dsl_scan_visitds. */
535 - if (ds != NULL && !dsl_dataset_is_snapshot(ds) && !BP_IS_HOLE(rootbp)) {
535 + if (ds != NULL && !ds->ds_is_snapshot && !BP_IS_HOLE(rootbp)) {
536 536 arc_flags_t flags = ARC_FLAG_WAIT;
537 537 objset_phys_t *osp;
538 538 arc_buf_t *buf;
539 539
540 540 err = arc_read(NULL, td.td_spa, rootbp,
541 541 arc_getbuf_func, &buf,
542 542 ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL, &flags, NULL);
543 543 if (err != 0)
544 544 return (err);
545 545
546 546 osp = buf->b_data;
547 547 traverse_zil(&td, &osp->os_zil_header);
548 548 (void) arc_buf_remove_ref(buf, &buf);
549 549 }
550 550
551 551 if (!(flags & TRAVERSE_PREFETCH_DATA) ||
552 552 0 == taskq_dispatch(system_taskq, traverse_prefetch_thread,
553 553 &td, TQ_NOQUEUE))
554 554 pd.pd_exited = B_TRUE;
555 555
556 556 SET_BOOKMARK(&czb, td.td_objset,
557 557 ZB_ROOT_OBJECT, ZB_ROOT_LEVEL, ZB_ROOT_BLKID);
558 558 err = traverse_visitbp(&td, NULL, rootbp, &czb);
559 559
560 560 mutex_enter(&pd.pd_mtx);
561 561 pd.pd_cancel = B_TRUE;
562 562 cv_broadcast(&pd.pd_cv);
563 563 while (!pd.pd_exited)
564 564 cv_wait(&pd.pd_cv, &pd.pd_mtx);
565 565 mutex_exit(&pd.pd_mtx);
566 566
567 567 mutex_destroy(&pd.pd_mtx);
568 568 cv_destroy(&pd.pd_cv);
569 569
570 570 return (err);
571 571 }
572 572
573 573 /*
574 574 * NB: dataset must not be changing on-disk (eg, is a snapshot or we are
575 575 * in syncing context).
576 576 */
577 577 int
578 578 traverse_dataset(dsl_dataset_t *ds, uint64_t txg_start, int flags,
579 579 blkptr_cb_t func, void *arg)
580 580 {
581 581 return (traverse_impl(ds->ds_dir->dd_pool->dp_spa, ds, ds->ds_object,
582 582 &dsl_dataset_phys(ds)->ds_bp, txg_start, NULL, flags, func, arg));
583 583 }
584 584
585 585 int
586 586 traverse_dataset_destroyed(spa_t *spa, blkptr_t *blkptr,
587 587 uint64_t txg_start, zbookmark_phys_t *resume, int flags,
588 588 blkptr_cb_t func, void *arg)
589 589 {
590 590 return (traverse_impl(spa, NULL, ZB_DESTROYED_OBJSET,
591 591 blkptr, txg_start, resume, flags, func, arg));
592 592 }
593 593
594 594 /*
595 595 * NB: pool must not be changing on-disk (eg, from zdb or sync context).
596 596 */
597 597 int
598 598 traverse_pool(spa_t *spa, uint64_t txg_start, int flags,
599 599 blkptr_cb_t func, void *arg)
600 600 {
601 601 int err;
602 602 uint64_t obj;
603 603 dsl_pool_t *dp = spa_get_dsl(spa);
604 604 objset_t *mos = dp->dp_meta_objset;
605 605 boolean_t hard = (flags & TRAVERSE_HARD);
606 606
607 607 /* visit the MOS */
608 608 err = traverse_impl(spa, NULL, 0, spa_get_rootblkptr(spa),
609 609 txg_start, NULL, flags, func, arg);
610 610 if (err != 0)
611 611 return (err);
612 612
613 613 /* visit each dataset */
614 614 for (obj = 1; err == 0;
615 615 err = dmu_object_next(mos, &obj, FALSE, txg_start)) {
616 616 dmu_object_info_t doi;
617 617
618 618 err = dmu_object_info(mos, obj, &doi);
619 619 if (err != 0) {
620 620 if (hard)
621 621 continue;
622 622 break;
623 623 }
624 624
625 625 if (doi.doi_bonus_type == DMU_OT_DSL_DATASET) {
626 626 dsl_dataset_t *ds;
627 627 uint64_t txg = txg_start;
628 628
629 629 dsl_pool_config_enter(dp, FTAG);
630 630 err = dsl_dataset_hold_obj(dp, obj, FTAG, &ds);
631 631 dsl_pool_config_exit(dp, FTAG);
632 632 if (err != 0) {
633 633 if (hard)
634 634 continue;
635 635 break;
636 636 }
637 637 if (dsl_dataset_phys(ds)->ds_prev_snap_txg > txg)
638 638 txg = dsl_dataset_phys(ds)->ds_prev_snap_txg;
639 639 err = traverse_dataset(ds, txg, flags, func, arg);
640 640 dsl_dataset_rele(ds, FTAG);
641 641 if (err != 0)
642 642 break;
643 643 }
644 644 }
645 645 if (err == ESRCH)
646 646 err = 0;
647 647 return (err);
648 648 }
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