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
traverse_zil_block(zilog_t * zilog,blkptr_t * bp,void * arg,uint64_t claim_txg)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
traverse_zil_record(zilog_t * zilog,lr_t * lrc,void * arg,uint64_t claim_txg)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
traverse_zil(traverse_data_t * td,zil_header_t * zh)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
resume_skip_check(traverse_data_t * td,const dnode_phys_t * dnp,const zbookmark_phys_t * zb)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
traverse_prefetch_metadata(traverse_data_t * td,const blkptr_t * bp,const zbookmark_phys_t * zb)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
prefetch_needed(prefetch_data_t * pfd,const blkptr_t * bp)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
traverse_visitbp(traverse_data_t * td,const dnode_phys_t * dnp,const blkptr_t * bp,const zbookmark_phys_t * zb)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
prefetch_dnode_metadata(traverse_data_t * td,const dnode_phys_t * dnp,uint64_t objset,uint64_t object)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
traverse_dnode(traverse_data_t * td,const dnode_phys_t * dnp,uint64_t objset,uint64_t object)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
traverse_prefetcher(spa_t * spa,zilog_t * zilog,const blkptr_t * bp,const zbookmark_phys_t * zb,const dnode_phys_t * dnp,void * arg)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
traverse_prefetch_thread(void * arg)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
traverse_impl(spa_t * spa,dsl_dataset_t * ds,uint64_t objset,blkptr_t * rootbp,uint64_t txg_start,zbookmark_phys_t * resume,int flags,blkptr_cb_t func,void * arg)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
traverse_dataset_resume(dsl_dataset_t * ds,uint64_t txg_start,zbookmark_phys_t * resume,int flags,blkptr_cb_t func,void * arg)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
traverse_dataset(dsl_dataset_t * ds,uint64_t txg_start,int flags,blkptr_cb_t func,void * arg)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
traverse_dataset_destroyed(spa_t * spa,blkptr_t * blkptr,uint64_t txg_start,zbookmark_phys_t * resume,int flags,blkptr_cb_t func,void * arg)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
traverse_pool(spa_t * spa,uint64_t txg_start,int flags,blkptr_cb_t func,void * arg)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