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3006 VERIFY[S,U,P] and ASSERT[S,U,P] frequently check if first argument is zero
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--- old/usr/src/uts/common/fs/zfs/dsl_scan.c
+++ new/usr/src/uts/common/fs/zfs/dsl_scan.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) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
23 23 * Copyright (c) 2012 by Delphix. All rights reserved.
24 24 */
25 25
26 26 #include <sys/dsl_scan.h>
27 27 #include <sys/dsl_pool.h>
28 28 #include <sys/dsl_dataset.h>
29 29 #include <sys/dsl_prop.h>
30 30 #include <sys/dsl_dir.h>
31 31 #include <sys/dsl_synctask.h>
32 32 #include <sys/dnode.h>
33 33 #include <sys/dmu_tx.h>
34 34 #include <sys/dmu_objset.h>
35 35 #include <sys/arc.h>
36 36 #include <sys/zap.h>
37 37 #include <sys/zio.h>
38 38 #include <sys/zfs_context.h>
39 39 #include <sys/fs/zfs.h>
40 40 #include <sys/zfs_znode.h>
41 41 #include <sys/spa_impl.h>
42 42 #include <sys/vdev_impl.h>
43 43 #include <sys/zil_impl.h>
44 44 #include <sys/zio_checksum.h>
45 45 #include <sys/ddt.h>
46 46 #include <sys/sa.h>
47 47 #include <sys/sa_impl.h>
48 48 #include <sys/zfeature.h>
49 49 #ifdef _KERNEL
50 50 #include <sys/zfs_vfsops.h>
51 51 #endif
52 52
53 53 typedef int (scan_cb_t)(dsl_pool_t *, const blkptr_t *, const zbookmark_t *);
54 54
55 55 static scan_cb_t dsl_scan_defrag_cb;
56 56 static scan_cb_t dsl_scan_scrub_cb;
57 57 static scan_cb_t dsl_scan_remove_cb;
58 58 static dsl_syncfunc_t dsl_scan_cancel_sync;
59 59 static void dsl_scan_sync_state(dsl_scan_t *, dmu_tx_t *tx);
60 60
61 61 int zfs_top_maxinflight = 32; /* maximum I/Os per top-level */
62 62 int zfs_resilver_delay = 2; /* number of ticks to delay resilver */
63 63 int zfs_scrub_delay = 4; /* number of ticks to delay scrub */
64 64 int zfs_scan_idle = 50; /* idle window in clock ticks */
65 65
66 66 int zfs_scan_min_time_ms = 1000; /* min millisecs to scrub per txg */
67 67 int zfs_free_min_time_ms = 1000; /* min millisecs to free per txg */
68 68 int zfs_resilver_min_time_ms = 3000; /* min millisecs to resilver per txg */
69 69 boolean_t zfs_no_scrub_io = B_FALSE; /* set to disable scrub i/o */
70 70 boolean_t zfs_no_scrub_prefetch = B_FALSE; /* set to disable srub prefetching */
71 71 enum ddt_class zfs_scrub_ddt_class_max = DDT_CLASS_DUPLICATE;
72 72 int dsl_scan_delay_completion = B_FALSE; /* set to delay scan completion */
73 73
74 74 #define DSL_SCAN_IS_SCRUB_RESILVER(scn) \
75 75 ((scn)->scn_phys.scn_func == POOL_SCAN_SCRUB || \
76 76 (scn)->scn_phys.scn_func == POOL_SCAN_RESILVER)
77 77
78 78 extern int zfs_txg_timeout;
79 79
80 80 /* the order has to match pool_scan_type */
81 81 static scan_cb_t *scan_funcs[POOL_SCAN_FUNCS] = {
82 82 NULL,
83 83 dsl_scan_scrub_cb, /* POOL_SCAN_SCRUB */
84 84 dsl_scan_scrub_cb, /* POOL_SCAN_RESILVER */
85 85 };
86 86
87 87 int
88 88 dsl_scan_init(dsl_pool_t *dp, uint64_t txg)
89 89 {
90 90 int err;
91 91 dsl_scan_t *scn;
92 92 spa_t *spa = dp->dp_spa;
93 93 uint64_t f;
94 94
95 95 scn = dp->dp_scan = kmem_zalloc(sizeof (dsl_scan_t), KM_SLEEP);
96 96 scn->scn_dp = dp;
97 97
98 98 err = zap_lookup(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT,
99 99 "scrub_func", sizeof (uint64_t), 1, &f);
100 100 if (err == 0) {
101 101 /*
102 102 * There was an old-style scrub in progress. Restart a
103 103 * new-style scrub from the beginning.
104 104 */
105 105 scn->scn_restart_txg = txg;
106 106 zfs_dbgmsg("old-style scrub was in progress; "
107 107 "restarting new-style scrub in txg %llu",
108 108 scn->scn_restart_txg);
109 109
110 110 /*
111 111 * Load the queue obj from the old location so that it
112 112 * can be freed by dsl_scan_done().
113 113 */
114 114 (void) zap_lookup(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT,
115 115 "scrub_queue", sizeof (uint64_t), 1,
116 116 &scn->scn_phys.scn_queue_obj);
117 117 } else {
118 118 err = zap_lookup(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT,
119 119 DMU_POOL_SCAN, sizeof (uint64_t), SCAN_PHYS_NUMINTS,
120 120 &scn->scn_phys);
121 121 if (err == ENOENT)
122 122 return (0);
123 123 else if (err)
124 124 return (err);
125 125
126 126 if (scn->scn_phys.scn_state == DSS_SCANNING &&
127 127 spa_prev_software_version(dp->dp_spa) < SPA_VERSION_SCAN) {
128 128 /*
129 129 * A new-type scrub was in progress on an old
130 130 * pool, and the pool was accessed by old
131 131 * software. Restart from the beginning, since
132 132 * the old software may have changed the pool in
133 133 * the meantime.
134 134 */
135 135 scn->scn_restart_txg = txg;
136 136 zfs_dbgmsg("new-style scrub was modified "
137 137 "by old software; restarting in txg %llu",
138 138 scn->scn_restart_txg);
139 139 }
140 140 }
141 141
142 142 spa_scan_stat_init(spa);
143 143 return (0);
144 144 }
145 145
146 146 void
147 147 dsl_scan_fini(dsl_pool_t *dp)
148 148 {
149 149 if (dp->dp_scan) {
150 150 kmem_free(dp->dp_scan, sizeof (dsl_scan_t));
151 151 dp->dp_scan = NULL;
152 152 }
153 153 }
154 154
155 155 /* ARGSUSED */
156 156 static int
157 157 dsl_scan_setup_check(void *arg1, void *arg2, dmu_tx_t *tx)
158 158 {
159 159 dsl_scan_t *scn = arg1;
160 160
161 161 if (scn->scn_phys.scn_state == DSS_SCANNING)
162 162 return (EBUSY);
163 163
164 164 return (0);
165 165 }
166 166
167 167 /* ARGSUSED */
168 168 static void
169 169 dsl_scan_setup_sync(void *arg1, void *arg2, dmu_tx_t *tx)
170 170 {
171 171 dsl_scan_t *scn = arg1;
172 172 pool_scan_func_t *funcp = arg2;
173 173 dmu_object_type_t ot = 0;
174 174 dsl_pool_t *dp = scn->scn_dp;
175 175 spa_t *spa = dp->dp_spa;
176 176
177 177 ASSERT(scn->scn_phys.scn_state != DSS_SCANNING);
178 178 ASSERT(*funcp > POOL_SCAN_NONE && *funcp < POOL_SCAN_FUNCS);
179 179 bzero(&scn->scn_phys, sizeof (scn->scn_phys));
180 180 scn->scn_phys.scn_func = *funcp;
181 181 scn->scn_phys.scn_state = DSS_SCANNING;
182 182 scn->scn_phys.scn_min_txg = 0;
183 183 scn->scn_phys.scn_max_txg = tx->tx_txg;
184 184 scn->scn_phys.scn_ddt_class_max = DDT_CLASSES - 1; /* the entire DDT */
185 185 scn->scn_phys.scn_start_time = gethrestime_sec();
186 186 scn->scn_phys.scn_errors = 0;
187 187 scn->scn_phys.scn_to_examine = spa->spa_root_vdev->vdev_stat.vs_alloc;
188 188 scn->scn_restart_txg = 0;
189 189 spa_scan_stat_init(spa);
190 190
191 191 if (DSL_SCAN_IS_SCRUB_RESILVER(scn)) {
192 192 scn->scn_phys.scn_ddt_class_max = zfs_scrub_ddt_class_max;
193 193
194 194 /* rewrite all disk labels */
195 195 vdev_config_dirty(spa->spa_root_vdev);
196 196
197 197 if (vdev_resilver_needed(spa->spa_root_vdev,
198 198 &scn->scn_phys.scn_min_txg, &scn->scn_phys.scn_max_txg)) {
199 199 spa_event_notify(spa, NULL, ESC_ZFS_RESILVER_START);
200 200 } else {
201 201 spa_event_notify(spa, NULL, ESC_ZFS_SCRUB_START);
202 202 }
203 203
204 204 spa->spa_scrub_started = B_TRUE;
205 205 /*
206 206 * If this is an incremental scrub, limit the DDT scrub phase
207 207 * to just the auto-ditto class (for correctness); the rest
208 208 * of the scrub should go faster using top-down pruning.
209 209 */
210 210 if (scn->scn_phys.scn_min_txg > TXG_INITIAL)
211 211 scn->scn_phys.scn_ddt_class_max = DDT_CLASS_DITTO;
212 212
213 213 }
214 214
215 215 /* back to the generic stuff */
216 216
217 217 if (dp->dp_blkstats == NULL) {
218 218 dp->dp_blkstats =
219 219 kmem_alloc(sizeof (zfs_all_blkstats_t), KM_SLEEP);
220 220 }
221 221 bzero(dp->dp_blkstats, sizeof (zfs_all_blkstats_t));
222 222
223 223 if (spa_version(spa) < SPA_VERSION_DSL_SCRUB)
224 224 ot = DMU_OT_ZAP_OTHER;
225 225
226 226 scn->scn_phys.scn_queue_obj = zap_create(dp->dp_meta_objset,
227 227 ot ? ot : DMU_OT_SCAN_QUEUE, DMU_OT_NONE, 0, tx);
228 228
229 229 dsl_scan_sync_state(scn, tx);
230 230
231 231 spa_history_log_internal(spa, "scan setup", tx,
232 232 "func=%u mintxg=%llu maxtxg=%llu",
233 233 *funcp, scn->scn_phys.scn_min_txg, scn->scn_phys.scn_max_txg);
234 234 }
235 235
236 236 /* ARGSUSED */
237 237 static void
238 238 dsl_scan_done(dsl_scan_t *scn, boolean_t complete, dmu_tx_t *tx)
239 239 {
240 240 static const char *old_names[] = {
241 241 "scrub_bookmark",
242 242 "scrub_ddt_bookmark",
243 243 "scrub_ddt_class_max",
244 244 "scrub_queue",
245 245 "scrub_min_txg",
246 246 "scrub_max_txg",
247 247 "scrub_func",
248 248 "scrub_errors",
249 249 NULL
250 250 };
251 251
252 252 dsl_pool_t *dp = scn->scn_dp;
253 253 spa_t *spa = dp->dp_spa;
254 254 int i;
255 255
256 256 /* Remove any remnants of an old-style scrub. */
257 257 for (i = 0; old_names[i]; i++) {
258 258 (void) zap_remove(dp->dp_meta_objset,
259 259 DMU_POOL_DIRECTORY_OBJECT, old_names[i], tx);
260 260 }
261 261
262 262 if (scn->scn_phys.scn_queue_obj != 0) {
263 263 VERIFY(0 == dmu_object_free(dp->dp_meta_objset,
264 264 scn->scn_phys.scn_queue_obj, tx));
265 265 scn->scn_phys.scn_queue_obj = 0;
266 266 }
267 267
268 268 /*
269 269 * If we were "restarted" from a stopped state, don't bother
270 270 * with anything else.
271 271 */
272 272 if (scn->scn_phys.scn_state != DSS_SCANNING)
273 273 return;
274 274
275 275 if (complete)
276 276 scn->scn_phys.scn_state = DSS_FINISHED;
277 277 else
278 278 scn->scn_phys.scn_state = DSS_CANCELED;
279 279
280 280 spa_history_log_internal(spa, "scan done", tx,
281 281 "complete=%u", complete);
282 282
283 283 if (DSL_SCAN_IS_SCRUB_RESILVER(scn)) {
284 284 mutex_enter(&spa->spa_scrub_lock);
285 285 while (spa->spa_scrub_inflight > 0) {
286 286 cv_wait(&spa->spa_scrub_io_cv,
287 287 &spa->spa_scrub_lock);
288 288 }
289 289 mutex_exit(&spa->spa_scrub_lock);
290 290 spa->spa_scrub_started = B_FALSE;
291 291 spa->spa_scrub_active = B_FALSE;
292 292
293 293 /*
294 294 * If the scrub/resilver completed, update all DTLs to
295 295 * reflect this. Whether it succeeded or not, vacate
296 296 * all temporary scrub DTLs.
297 297 */
298 298 vdev_dtl_reassess(spa->spa_root_vdev, tx->tx_txg,
299 299 complete ? scn->scn_phys.scn_max_txg : 0, B_TRUE);
300 300 if (complete) {
301 301 spa_event_notify(spa, NULL, scn->scn_phys.scn_min_txg ?
302 302 ESC_ZFS_RESILVER_FINISH : ESC_ZFS_SCRUB_FINISH);
303 303 }
304 304 spa_errlog_rotate(spa);
305 305
306 306 /*
307 307 * We may have finished replacing a device.
308 308 * Let the async thread assess this and handle the detach.
309 309 */
310 310 spa_async_request(spa, SPA_ASYNC_RESILVER_DONE);
311 311 }
312 312
313 313 scn->scn_phys.scn_end_time = gethrestime_sec();
314 314 }
315 315
316 316 /* ARGSUSED */
317 317 static int
318 318 dsl_scan_cancel_check(void *arg1, void *arg2, dmu_tx_t *tx)
319 319 {
320 320 dsl_scan_t *scn = arg1;
321 321
322 322 if (scn->scn_phys.scn_state != DSS_SCANNING)
323 323 return (ENOENT);
324 324 return (0);
325 325 }
326 326
327 327 /* ARGSUSED */
328 328 static void
329 329 dsl_scan_cancel_sync(void *arg1, void *arg2, dmu_tx_t *tx)
330 330 {
331 331 dsl_scan_t *scn = arg1;
332 332
333 333 dsl_scan_done(scn, B_FALSE, tx);
334 334 dsl_scan_sync_state(scn, tx);
335 335 }
336 336
337 337 int
338 338 dsl_scan_cancel(dsl_pool_t *dp)
339 339 {
340 340 boolean_t complete = B_FALSE;
341 341 int err;
342 342
343 343 err = dsl_sync_task_do(dp, dsl_scan_cancel_check,
344 344 dsl_scan_cancel_sync, dp->dp_scan, &complete, 3);
345 345 return (err);
346 346 }
347 347
348 348 static void dsl_scan_visitbp(blkptr_t *bp,
349 349 const zbookmark_t *zb, dnode_phys_t *dnp, arc_buf_t *pbuf,
350 350 dsl_dataset_t *ds, dsl_scan_t *scn, dmu_objset_type_t ostype,
351 351 dmu_tx_t *tx);
352 352 static void dsl_scan_visitdnode(dsl_scan_t *, dsl_dataset_t *ds,
353 353 dmu_objset_type_t ostype,
354 354 dnode_phys_t *dnp, arc_buf_t *buf, uint64_t object, dmu_tx_t *tx);
355 355
356 356 void
357 357 dsl_free(dsl_pool_t *dp, uint64_t txg, const blkptr_t *bp)
358 358 {
359 359 zio_free(dp->dp_spa, txg, bp);
360 360 }
361 361
362 362 void
363 363 dsl_free_sync(zio_t *pio, dsl_pool_t *dp, uint64_t txg, const blkptr_t *bpp)
364 364 {
365 365 ASSERT(dsl_pool_sync_context(dp));
366 366 zio_nowait(zio_free_sync(pio, dp->dp_spa, txg, bpp, pio->io_flags));
367 367 }
368 368
369 369 int
370 370 dsl_read(zio_t *pio, spa_t *spa, const blkptr_t *bpp, arc_buf_t *pbuf,
371 371 arc_done_func_t *done, void *private, int priority, int zio_flags,
372 372 uint32_t *arc_flags, const zbookmark_t *zb)
373 373 {
374 374 return (arc_read(pio, spa, bpp, pbuf, done, private,
375 375 priority, zio_flags, arc_flags, zb));
376 376 }
377 377
378 378 int
379 379 dsl_read_nolock(zio_t *pio, spa_t *spa, const blkptr_t *bpp,
380 380 arc_done_func_t *done, void *private, int priority, int zio_flags,
381 381 uint32_t *arc_flags, const zbookmark_t *zb)
382 382 {
383 383 return (arc_read_nolock(pio, spa, bpp, done, private,
384 384 priority, zio_flags, arc_flags, zb));
385 385 }
386 386
387 387 static uint64_t
388 388 dsl_scan_ds_maxtxg(dsl_dataset_t *ds)
389 389 {
390 390 uint64_t smt = ds->ds_dir->dd_pool->dp_scan->scn_phys.scn_max_txg;
391 391 if (dsl_dataset_is_snapshot(ds))
392 392 return (MIN(smt, ds->ds_phys->ds_creation_txg));
393 393 return (smt);
394 394 }
395 395
396 396 static void
397 397 dsl_scan_sync_state(dsl_scan_t *scn, dmu_tx_t *tx)
398 398 {
399 399 VERIFY(0 == zap_update(scn->scn_dp->dp_meta_objset,
400 400 DMU_POOL_DIRECTORY_OBJECT,
401 401 DMU_POOL_SCAN, sizeof (uint64_t), SCAN_PHYS_NUMINTS,
402 402 &scn->scn_phys, tx));
403 403 }
404 404
405 405 static boolean_t
406 406 dsl_scan_check_pause(dsl_scan_t *scn, const zbookmark_t *zb)
407 407 {
408 408 uint64_t elapsed_nanosecs;
409 409 int mintime;
410 410
411 411 /* we never skip user/group accounting objects */
412 412 if (zb && (int64_t)zb->zb_object < 0)
413 413 return (B_FALSE);
414 414
415 415 if (scn->scn_pausing)
416 416 return (B_TRUE); /* we're already pausing */
417 417
418 418 if (!ZB_IS_ZERO(&scn->scn_phys.scn_bookmark))
419 419 return (B_FALSE); /* we're resuming */
420 420
421 421 /* We only know how to resume from level-0 blocks. */
422 422 if (zb && zb->zb_level != 0)
423 423 return (B_FALSE);
424 424
425 425 mintime = (scn->scn_phys.scn_func == POOL_SCAN_RESILVER) ?
426 426 zfs_resilver_min_time_ms : zfs_scan_min_time_ms;
427 427 elapsed_nanosecs = gethrtime() - scn->scn_sync_start_time;
428 428 if (elapsed_nanosecs / NANOSEC > zfs_txg_timeout ||
429 429 (elapsed_nanosecs / MICROSEC > mintime &&
430 430 txg_sync_waiting(scn->scn_dp)) ||
431 431 spa_shutting_down(scn->scn_dp->dp_spa)) {
432 432 if (zb) {
433 433 dprintf("pausing at bookmark %llx/%llx/%llx/%llx\n",
434 434 (longlong_t)zb->zb_objset,
435 435 (longlong_t)zb->zb_object,
436 436 (longlong_t)zb->zb_level,
437 437 (longlong_t)zb->zb_blkid);
438 438 scn->scn_phys.scn_bookmark = *zb;
439 439 }
440 440 dprintf("pausing at DDT bookmark %llx/%llx/%llx/%llx\n",
441 441 (longlong_t)scn->scn_phys.scn_ddt_bookmark.ddb_class,
442 442 (longlong_t)scn->scn_phys.scn_ddt_bookmark.ddb_type,
443 443 (longlong_t)scn->scn_phys.scn_ddt_bookmark.ddb_checksum,
444 444 (longlong_t)scn->scn_phys.scn_ddt_bookmark.ddb_cursor);
445 445 scn->scn_pausing = B_TRUE;
446 446 return (B_TRUE);
447 447 }
448 448 return (B_FALSE);
449 449 }
450 450
451 451 typedef struct zil_scan_arg {
452 452 dsl_pool_t *zsa_dp;
453 453 zil_header_t *zsa_zh;
454 454 } zil_scan_arg_t;
455 455
456 456 /* ARGSUSED */
457 457 static int
458 458 dsl_scan_zil_block(zilog_t *zilog, blkptr_t *bp, void *arg, uint64_t claim_txg)
459 459 {
460 460 zil_scan_arg_t *zsa = arg;
461 461 dsl_pool_t *dp = zsa->zsa_dp;
462 462 dsl_scan_t *scn = dp->dp_scan;
463 463 zil_header_t *zh = zsa->zsa_zh;
464 464 zbookmark_t zb;
465 465
466 466 if (bp->blk_birth <= scn->scn_phys.scn_cur_min_txg)
467 467 return (0);
468 468
469 469 /*
470 470 * One block ("stubby") can be allocated a long time ago; we
471 471 * want to visit that one because it has been allocated
472 472 * (on-disk) even if it hasn't been claimed (even though for
473 473 * scrub there's nothing to do to it).
474 474 */
475 475 if (claim_txg == 0 && bp->blk_birth >= spa_first_txg(dp->dp_spa))
476 476 return (0);
477 477
478 478 SET_BOOKMARK(&zb, zh->zh_log.blk_cksum.zc_word[ZIL_ZC_OBJSET],
479 479 ZB_ZIL_OBJECT, ZB_ZIL_LEVEL, bp->blk_cksum.zc_word[ZIL_ZC_SEQ]);
480 480
481 481 VERIFY(0 == scan_funcs[scn->scn_phys.scn_func](dp, bp, &zb));
482 482 return (0);
483 483 }
484 484
485 485 /* ARGSUSED */
486 486 static int
487 487 dsl_scan_zil_record(zilog_t *zilog, lr_t *lrc, void *arg, uint64_t claim_txg)
488 488 {
489 489 if (lrc->lrc_txtype == TX_WRITE) {
490 490 zil_scan_arg_t *zsa = arg;
491 491 dsl_pool_t *dp = zsa->zsa_dp;
492 492 dsl_scan_t *scn = dp->dp_scan;
493 493 zil_header_t *zh = zsa->zsa_zh;
494 494 lr_write_t *lr = (lr_write_t *)lrc;
495 495 blkptr_t *bp = &lr->lr_blkptr;
496 496 zbookmark_t zb;
497 497
498 498 if (bp->blk_birth <= scn->scn_phys.scn_cur_min_txg)
499 499 return (0);
500 500
501 501 /*
502 502 * birth can be < claim_txg if this record's txg is
503 503 * already txg sync'ed (but this log block contains
504 504 * other records that are not synced)
505 505 */
506 506 if (claim_txg == 0 || bp->blk_birth < claim_txg)
507 507 return (0);
508 508
509 509 SET_BOOKMARK(&zb, zh->zh_log.blk_cksum.zc_word[ZIL_ZC_OBJSET],
510 510 lr->lr_foid, ZB_ZIL_LEVEL,
511 511 lr->lr_offset / BP_GET_LSIZE(bp));
512 512
513 513 VERIFY(0 == scan_funcs[scn->scn_phys.scn_func](dp, bp, &zb));
514 514 }
515 515 return (0);
516 516 }
517 517
518 518 static void
519 519 dsl_scan_zil(dsl_pool_t *dp, zil_header_t *zh)
520 520 {
521 521 uint64_t claim_txg = zh->zh_claim_txg;
522 522 zil_scan_arg_t zsa = { dp, zh };
523 523 zilog_t *zilog;
524 524
525 525 /*
526 526 * We only want to visit blocks that have been claimed but not yet
527 527 * replayed (or, in read-only mode, blocks that *would* be claimed).
528 528 */
529 529 if (claim_txg == 0 && spa_writeable(dp->dp_spa))
530 530 return;
531 531
532 532 zilog = zil_alloc(dp->dp_meta_objset, zh);
533 533
534 534 (void) zil_parse(zilog, dsl_scan_zil_block, dsl_scan_zil_record, &zsa,
535 535 claim_txg);
536 536
537 537 zil_free(zilog);
538 538 }
539 539
540 540 /* ARGSUSED */
541 541 static void
542 542 dsl_scan_prefetch(dsl_scan_t *scn, arc_buf_t *buf, blkptr_t *bp,
543 543 uint64_t objset, uint64_t object, uint64_t blkid)
544 544 {
545 545 zbookmark_t czb;
546 546 uint32_t flags = ARC_NOWAIT | ARC_PREFETCH;
547 547
548 548 if (zfs_no_scrub_prefetch)
549 549 return;
550 550
551 551 if (BP_IS_HOLE(bp) || bp->blk_birth <= scn->scn_phys.scn_min_txg ||
552 552 (BP_GET_LEVEL(bp) == 0 && BP_GET_TYPE(bp) != DMU_OT_DNODE))
553 553 return;
554 554
555 555 SET_BOOKMARK(&czb, objset, object, BP_GET_LEVEL(bp), blkid);
556 556
557 557 /*
558 558 * XXX need to make sure all of these arc_read() prefetches are
559 559 * done before setting xlateall (similar to dsl_read())
560 560 */
561 561 (void) arc_read(scn->scn_zio_root, scn->scn_dp->dp_spa, bp,
562 562 buf, NULL, NULL, ZIO_PRIORITY_ASYNC_READ,
563 563 ZIO_FLAG_CANFAIL | ZIO_FLAG_SCAN_THREAD, &flags, &czb);
564 564 }
565 565
566 566 static boolean_t
567 567 dsl_scan_check_resume(dsl_scan_t *scn, const dnode_phys_t *dnp,
568 568 const zbookmark_t *zb)
569 569 {
570 570 /*
571 571 * We never skip over user/group accounting objects (obj<0)
572 572 */
573 573 if (!ZB_IS_ZERO(&scn->scn_phys.scn_bookmark) &&
574 574 (int64_t)zb->zb_object >= 0) {
575 575 /*
576 576 * If we already visited this bp & everything below (in
577 577 * a prior txg sync), don't bother doing it again.
578 578 */
579 579 if (zbookmark_is_before(dnp, zb, &scn->scn_phys.scn_bookmark))
580 580 return (B_TRUE);
581 581
582 582 /*
583 583 * If we found the block we're trying to resume from, or
584 584 * we went past it to a different object, zero it out to
585 585 * indicate that it's OK to start checking for pausing
586 586 * again.
587 587 */
588 588 if (bcmp(zb, &scn->scn_phys.scn_bookmark, sizeof (*zb)) == 0 ||
589 589 zb->zb_object > scn->scn_phys.scn_bookmark.zb_object) {
590 590 dprintf("resuming at %llx/%llx/%llx/%llx\n",
591 591 (longlong_t)zb->zb_objset,
592 592 (longlong_t)zb->zb_object,
593 593 (longlong_t)zb->zb_level,
594 594 (longlong_t)zb->zb_blkid);
595 595 bzero(&scn->scn_phys.scn_bookmark, sizeof (*zb));
596 596 }
597 597 }
598 598 return (B_FALSE);
599 599 }
600 600
601 601 /*
602 602 * Return nonzero on i/o error.
603 603 * Return new buf to write out in *bufp.
604 604 */
605 605 static int
606 606 dsl_scan_recurse(dsl_scan_t *scn, dsl_dataset_t *ds, dmu_objset_type_t ostype,
607 607 dnode_phys_t *dnp, const blkptr_t *bp,
608 608 const zbookmark_t *zb, dmu_tx_t *tx, arc_buf_t **bufp)
609 609 {
610 610 dsl_pool_t *dp = scn->scn_dp;
611 611 int zio_flags = ZIO_FLAG_CANFAIL | ZIO_FLAG_SCAN_THREAD;
612 612 int err;
613 613
614 614 if (BP_GET_LEVEL(bp) > 0) {
615 615 uint32_t flags = ARC_WAIT;
616 616 int i;
617 617 blkptr_t *cbp;
618 618 int epb = BP_GET_LSIZE(bp) >> SPA_BLKPTRSHIFT;
619 619
620 620 err = arc_read_nolock(NULL, dp->dp_spa, bp,
621 621 arc_getbuf_func, bufp,
622 622 ZIO_PRIORITY_ASYNC_READ, zio_flags, &flags, zb);
623 623 if (err) {
624 624 scn->scn_phys.scn_errors++;
625 625 return (err);
626 626 }
627 627 for (i = 0, cbp = (*bufp)->b_data; i < epb; i++, cbp++) {
628 628 dsl_scan_prefetch(scn, *bufp, cbp, zb->zb_objset,
629 629 zb->zb_object, zb->zb_blkid * epb + i);
630 630 }
631 631 for (i = 0, cbp = (*bufp)->b_data; i < epb; i++, cbp++) {
632 632 zbookmark_t czb;
633 633
634 634 SET_BOOKMARK(&czb, zb->zb_objset, zb->zb_object,
635 635 zb->zb_level - 1,
636 636 zb->zb_blkid * epb + i);
637 637 dsl_scan_visitbp(cbp, &czb, dnp,
638 638 *bufp, ds, scn, ostype, tx);
639 639 }
640 640 } else if (BP_GET_TYPE(bp) == DMU_OT_USERGROUP_USED) {
641 641 uint32_t flags = ARC_WAIT;
642 642
643 643 err = arc_read_nolock(NULL, dp->dp_spa, bp,
644 644 arc_getbuf_func, bufp,
645 645 ZIO_PRIORITY_ASYNC_READ, zio_flags, &flags, zb);
646 646 if (err) {
647 647 scn->scn_phys.scn_errors++;
648 648 return (err);
649 649 }
650 650 } else if (BP_GET_TYPE(bp) == DMU_OT_DNODE) {
651 651 uint32_t flags = ARC_WAIT;
652 652 dnode_phys_t *cdnp;
653 653 int i, j;
654 654 int epb = BP_GET_LSIZE(bp) >> DNODE_SHIFT;
655 655
656 656 err = arc_read_nolock(NULL, dp->dp_spa, bp,
657 657 arc_getbuf_func, bufp,
658 658 ZIO_PRIORITY_ASYNC_READ, zio_flags, &flags, zb);
659 659 if (err) {
660 660 scn->scn_phys.scn_errors++;
661 661 return (err);
662 662 }
663 663 for (i = 0, cdnp = (*bufp)->b_data; i < epb; i++, cdnp++) {
664 664 for (j = 0; j < cdnp->dn_nblkptr; j++) {
665 665 blkptr_t *cbp = &cdnp->dn_blkptr[j];
666 666 dsl_scan_prefetch(scn, *bufp, cbp,
667 667 zb->zb_objset, zb->zb_blkid * epb + i, j);
668 668 }
669 669 }
670 670 for (i = 0, cdnp = (*bufp)->b_data; i < epb; i++, cdnp++) {
671 671 dsl_scan_visitdnode(scn, ds, ostype,
672 672 cdnp, *bufp, zb->zb_blkid * epb + i, tx);
673 673 }
674 674
675 675 } else if (BP_GET_TYPE(bp) == DMU_OT_OBJSET) {
676 676 uint32_t flags = ARC_WAIT;
677 677 objset_phys_t *osp;
678 678
679 679 err = arc_read_nolock(NULL, dp->dp_spa, bp,
680 680 arc_getbuf_func, bufp,
681 681 ZIO_PRIORITY_ASYNC_READ, zio_flags, &flags, zb);
682 682 if (err) {
683 683 scn->scn_phys.scn_errors++;
684 684 return (err);
685 685 }
686 686
687 687 osp = (*bufp)->b_data;
688 688
689 689 dsl_scan_visitdnode(scn, ds, osp->os_type,
690 690 &osp->os_meta_dnode, *bufp, DMU_META_DNODE_OBJECT, tx);
691 691
692 692 if (OBJSET_BUF_HAS_USERUSED(*bufp)) {
693 693 /*
694 694 * We also always visit user/group accounting
695 695 * objects, and never skip them, even if we are
696 696 * pausing. This is necessary so that the space
697 697 * deltas from this txg get integrated.
698 698 */
699 699 dsl_scan_visitdnode(scn, ds, osp->os_type,
700 700 &osp->os_groupused_dnode, *bufp,
701 701 DMU_GROUPUSED_OBJECT, tx);
702 702 dsl_scan_visitdnode(scn, ds, osp->os_type,
703 703 &osp->os_userused_dnode, *bufp,
704 704 DMU_USERUSED_OBJECT, tx);
705 705 }
706 706 }
707 707
708 708 return (0);
709 709 }
710 710
711 711 static void
712 712 dsl_scan_visitdnode(dsl_scan_t *scn, dsl_dataset_t *ds,
713 713 dmu_objset_type_t ostype, dnode_phys_t *dnp, arc_buf_t *buf,
714 714 uint64_t object, dmu_tx_t *tx)
715 715 {
716 716 int j;
717 717
718 718 for (j = 0; j < dnp->dn_nblkptr; j++) {
719 719 zbookmark_t czb;
720 720
721 721 SET_BOOKMARK(&czb, ds ? ds->ds_object : 0, object,
722 722 dnp->dn_nlevels - 1, j);
723 723 dsl_scan_visitbp(&dnp->dn_blkptr[j],
724 724 &czb, dnp, buf, ds, scn, ostype, tx);
725 725 }
726 726
727 727 if (dnp->dn_flags & DNODE_FLAG_SPILL_BLKPTR) {
728 728 zbookmark_t czb;
729 729 SET_BOOKMARK(&czb, ds ? ds->ds_object : 0, object,
730 730 0, DMU_SPILL_BLKID);
731 731 dsl_scan_visitbp(&dnp->dn_spill,
732 732 &czb, dnp, buf, ds, scn, ostype, tx);
733 733 }
734 734 }
735 735
736 736 /*
737 737 * The arguments are in this order because mdb can only print the
738 738 * first 5; we want them to be useful.
739 739 */
740 740 static void
741 741 dsl_scan_visitbp(blkptr_t *bp, const zbookmark_t *zb,
742 742 dnode_phys_t *dnp, arc_buf_t *pbuf,
743 743 dsl_dataset_t *ds, dsl_scan_t *scn, dmu_objset_type_t ostype,
744 744 dmu_tx_t *tx)
745 745 {
746 746 dsl_pool_t *dp = scn->scn_dp;
747 747 arc_buf_t *buf = NULL;
748 748 blkptr_t bp_toread = *bp;
749 749
750 750 /* ASSERT(pbuf == NULL || arc_released(pbuf)); */
751 751
752 752 if (dsl_scan_check_pause(scn, zb))
753 753 return;
754 754
755 755 if (dsl_scan_check_resume(scn, dnp, zb))
756 756 return;
757 757
758 758 if (bp->blk_birth == 0)
759 759 return;
760 760
761 761 scn->scn_visited_this_txg++;
762 762
763 763 dprintf_bp(bp,
764 764 "visiting ds=%p/%llu zb=%llx/%llx/%llx/%llx buf=%p bp=%p",
765 765 ds, ds ? ds->ds_object : 0,
766 766 zb->zb_objset, zb->zb_object, zb->zb_level, zb->zb_blkid,
767 767 pbuf, bp);
768 768
769 769 if (bp->blk_birth <= scn->scn_phys.scn_cur_min_txg)
770 770 return;
771 771
772 772 if (dsl_scan_recurse(scn, ds, ostype, dnp, &bp_toread, zb, tx,
773 773 &buf) != 0)
774 774 return;
775 775
776 776 /*
777 777 * If dsl_scan_ddt() has aready visited this block, it will have
778 778 * already done any translations or scrubbing, so don't call the
779 779 * callback again.
780 780 */
781 781 if (ddt_class_contains(dp->dp_spa,
782 782 scn->scn_phys.scn_ddt_class_max, bp)) {
783 783 ASSERT(buf == NULL);
784 784 return;
785 785 }
786 786
787 787 /*
788 788 * If this block is from the future (after cur_max_txg), then we
789 789 * are doing this on behalf of a deleted snapshot, and we will
790 790 * revisit the future block on the next pass of this dataset.
791 791 * Don't scan it now unless we need to because something
792 792 * under it was modified.
793 793 */
794 794 if (bp->blk_birth <= scn->scn_phys.scn_cur_max_txg) {
795 795 scan_funcs[scn->scn_phys.scn_func](dp, bp, zb);
796 796 }
797 797 if (buf)
798 798 (void) arc_buf_remove_ref(buf, &buf);
799 799 }
800 800
801 801 static void
802 802 dsl_scan_visit_rootbp(dsl_scan_t *scn, dsl_dataset_t *ds, blkptr_t *bp,
803 803 dmu_tx_t *tx)
804 804 {
805 805 zbookmark_t zb;
806 806
807 807 SET_BOOKMARK(&zb, ds ? ds->ds_object : DMU_META_OBJSET,
808 808 ZB_ROOT_OBJECT, ZB_ROOT_LEVEL, ZB_ROOT_BLKID);
809 809 dsl_scan_visitbp(bp, &zb, NULL, NULL,
810 810 ds, scn, DMU_OST_NONE, tx);
811 811
812 812 dprintf_ds(ds, "finished scan%s", "");
813 813 }
814 814
815 815 void
816 816 dsl_scan_ds_destroyed(dsl_dataset_t *ds, dmu_tx_t *tx)
817 817 {
818 818 dsl_pool_t *dp = ds->ds_dir->dd_pool;
819 819 dsl_scan_t *scn = dp->dp_scan;
820 820 uint64_t mintxg;
821 821
822 822 if (scn->scn_phys.scn_state != DSS_SCANNING)
823 823 return;
824 824
825 825 if (scn->scn_phys.scn_bookmark.zb_objset == ds->ds_object) {
826 826 if (dsl_dataset_is_snapshot(ds)) {
827 827 /* Note, scn_cur_{min,max}_txg stays the same. */
828 828 scn->scn_phys.scn_bookmark.zb_objset =
829 829 ds->ds_phys->ds_next_snap_obj;
830 830 zfs_dbgmsg("destroying ds %llu; currently traversing; "
831 831 "reset zb_objset to %llu",
832 832 (u_longlong_t)ds->ds_object,
833 833 (u_longlong_t)ds->ds_phys->ds_next_snap_obj);
834 834 scn->scn_phys.scn_flags |= DSF_VISIT_DS_AGAIN;
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835 835 } else {
836 836 SET_BOOKMARK(&scn->scn_phys.scn_bookmark,
837 837 ZB_DESTROYED_OBJSET, 0, 0, 0);
838 838 zfs_dbgmsg("destroying ds %llu; currently traversing; "
839 839 "reset bookmark to -1,0,0,0",
840 840 (u_longlong_t)ds->ds_object);
841 841 }
842 842 } else if (zap_lookup_int_key(dp->dp_meta_objset,
843 843 scn->scn_phys.scn_queue_obj, ds->ds_object, &mintxg) == 0) {
844 844 ASSERT3U(ds->ds_phys->ds_num_children, <=, 1);
845 - VERIFY3U(0, ==, zap_remove_int(dp->dp_meta_objset,
845 + VERIFY0(zap_remove_int(dp->dp_meta_objset,
846 846 scn->scn_phys.scn_queue_obj, ds->ds_object, tx));
847 847 if (dsl_dataset_is_snapshot(ds)) {
848 848 /*
849 849 * We keep the same mintxg; it could be >
850 850 * ds_creation_txg if the previous snapshot was
851 851 * deleted too.
852 852 */
853 853 VERIFY(zap_add_int_key(dp->dp_meta_objset,
854 854 scn->scn_phys.scn_queue_obj,
855 855 ds->ds_phys->ds_next_snap_obj, mintxg, tx) == 0);
856 856 zfs_dbgmsg("destroying ds %llu; in queue; "
857 857 "replacing with %llu",
858 858 (u_longlong_t)ds->ds_object,
859 859 (u_longlong_t)ds->ds_phys->ds_next_snap_obj);
860 860 } else {
861 861 zfs_dbgmsg("destroying ds %llu; in queue; removing",
862 862 (u_longlong_t)ds->ds_object);
863 863 }
864 864 } else {
865 865 zfs_dbgmsg("destroying ds %llu; ignoring",
866 866 (u_longlong_t)ds->ds_object);
867 867 }
868 868
869 869 /*
870 870 * dsl_scan_sync() should be called after this, and should sync
871 871 * out our changed state, but just to be safe, do it here.
872 872 */
873 873 dsl_scan_sync_state(scn, tx);
874 874 }
875 875
876 876 void
877 877 dsl_scan_ds_snapshotted(dsl_dataset_t *ds, dmu_tx_t *tx)
878 878 {
879 879 dsl_pool_t *dp = ds->ds_dir->dd_pool;
880 880 dsl_scan_t *scn = dp->dp_scan;
881 881 uint64_t mintxg;
882 882
883 883 if (scn->scn_phys.scn_state != DSS_SCANNING)
884 884 return;
885 885
886 886 ASSERT(ds->ds_phys->ds_prev_snap_obj != 0);
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887 887
888 888 if (scn->scn_phys.scn_bookmark.zb_objset == ds->ds_object) {
889 889 scn->scn_phys.scn_bookmark.zb_objset =
890 890 ds->ds_phys->ds_prev_snap_obj;
891 891 zfs_dbgmsg("snapshotting ds %llu; currently traversing; "
892 892 "reset zb_objset to %llu",
893 893 (u_longlong_t)ds->ds_object,
894 894 (u_longlong_t)ds->ds_phys->ds_prev_snap_obj);
895 895 } else if (zap_lookup_int_key(dp->dp_meta_objset,
896 896 scn->scn_phys.scn_queue_obj, ds->ds_object, &mintxg) == 0) {
897 - VERIFY3U(0, ==, zap_remove_int(dp->dp_meta_objset,
897 + VERIFY0(zap_remove_int(dp->dp_meta_objset,
898 898 scn->scn_phys.scn_queue_obj, ds->ds_object, tx));
899 899 VERIFY(zap_add_int_key(dp->dp_meta_objset,
900 900 scn->scn_phys.scn_queue_obj,
901 901 ds->ds_phys->ds_prev_snap_obj, mintxg, tx) == 0);
902 902 zfs_dbgmsg("snapshotting ds %llu; in queue; "
903 903 "replacing with %llu",
904 904 (u_longlong_t)ds->ds_object,
905 905 (u_longlong_t)ds->ds_phys->ds_prev_snap_obj);
906 906 }
907 907 dsl_scan_sync_state(scn, tx);
908 908 }
909 909
910 910 void
911 911 dsl_scan_ds_clone_swapped(dsl_dataset_t *ds1, dsl_dataset_t *ds2, dmu_tx_t *tx)
912 912 {
913 913 dsl_pool_t *dp = ds1->ds_dir->dd_pool;
914 914 dsl_scan_t *scn = dp->dp_scan;
915 915 uint64_t mintxg;
916 916
917 917 if (scn->scn_phys.scn_state != DSS_SCANNING)
918 918 return;
919 919
920 920 if (scn->scn_phys.scn_bookmark.zb_objset == ds1->ds_object) {
921 921 scn->scn_phys.scn_bookmark.zb_objset = ds2->ds_object;
922 922 zfs_dbgmsg("clone_swap ds %llu; currently traversing; "
923 923 "reset zb_objset to %llu",
924 924 (u_longlong_t)ds1->ds_object,
925 925 (u_longlong_t)ds2->ds_object);
926 926 } else if (scn->scn_phys.scn_bookmark.zb_objset == ds2->ds_object) {
927 927 scn->scn_phys.scn_bookmark.zb_objset = ds1->ds_object;
928 928 zfs_dbgmsg("clone_swap ds %llu; currently traversing; "
929 929 "reset zb_objset to %llu",
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930 930 (u_longlong_t)ds2->ds_object,
931 931 (u_longlong_t)ds1->ds_object);
932 932 }
933 933
934 934 if (zap_lookup_int_key(dp->dp_meta_objset, scn->scn_phys.scn_queue_obj,
935 935 ds1->ds_object, &mintxg) == 0) {
936 936 int err;
937 937
938 938 ASSERT3U(mintxg, ==, ds1->ds_phys->ds_prev_snap_txg);
939 939 ASSERT3U(mintxg, ==, ds2->ds_phys->ds_prev_snap_txg);
940 - VERIFY3U(0, ==, zap_remove_int(dp->dp_meta_objset,
940 + VERIFY0(zap_remove_int(dp->dp_meta_objset,
941 941 scn->scn_phys.scn_queue_obj, ds1->ds_object, tx));
942 942 err = zap_add_int_key(dp->dp_meta_objset,
943 943 scn->scn_phys.scn_queue_obj, ds2->ds_object, mintxg, tx);
944 944 VERIFY(err == 0 || err == EEXIST);
945 945 if (err == EEXIST) {
946 946 /* Both were there to begin with */
947 947 VERIFY(0 == zap_add_int_key(dp->dp_meta_objset,
948 948 scn->scn_phys.scn_queue_obj,
949 949 ds1->ds_object, mintxg, tx));
950 950 }
951 951 zfs_dbgmsg("clone_swap ds %llu; in queue; "
952 952 "replacing with %llu",
953 953 (u_longlong_t)ds1->ds_object,
954 954 (u_longlong_t)ds2->ds_object);
955 955 } else if (zap_lookup_int_key(dp->dp_meta_objset,
956 956 scn->scn_phys.scn_queue_obj, ds2->ds_object, &mintxg) == 0) {
957 957 ASSERT3U(mintxg, ==, ds1->ds_phys->ds_prev_snap_txg);
958 958 ASSERT3U(mintxg, ==, ds2->ds_phys->ds_prev_snap_txg);
959 - VERIFY3U(0, ==, zap_remove_int(dp->dp_meta_objset,
959 + VERIFY0(zap_remove_int(dp->dp_meta_objset,
960 960 scn->scn_phys.scn_queue_obj, ds2->ds_object, tx));
961 961 VERIFY(0 == zap_add_int_key(dp->dp_meta_objset,
962 962 scn->scn_phys.scn_queue_obj, ds1->ds_object, mintxg, tx));
963 963 zfs_dbgmsg("clone_swap ds %llu; in queue; "
964 964 "replacing with %llu",
965 965 (u_longlong_t)ds2->ds_object,
966 966 (u_longlong_t)ds1->ds_object);
967 967 }
968 968
969 969 dsl_scan_sync_state(scn, tx);
970 970 }
971 971
972 972 struct enqueue_clones_arg {
973 973 dmu_tx_t *tx;
974 974 uint64_t originobj;
975 975 };
976 976
977 977 /* ARGSUSED */
978 978 static int
979 979 enqueue_clones_cb(spa_t *spa, uint64_t dsobj, const char *dsname, void *arg)
980 980 {
981 981 struct enqueue_clones_arg *eca = arg;
982 982 dsl_dataset_t *ds;
983 983 int err;
984 984 dsl_pool_t *dp = spa->spa_dsl_pool;
985 985 dsl_scan_t *scn = dp->dp_scan;
986 986
987 987 err = dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds);
988 988 if (err)
989 989 return (err);
990 990
991 991 if (ds->ds_dir->dd_phys->dd_origin_obj == eca->originobj) {
992 992 while (ds->ds_phys->ds_prev_snap_obj != eca->originobj) {
993 993 dsl_dataset_t *prev;
994 994 err = dsl_dataset_hold_obj(dp,
995 995 ds->ds_phys->ds_prev_snap_obj, FTAG, &prev);
996 996
997 997 dsl_dataset_rele(ds, FTAG);
998 998 if (err)
999 999 return (err);
1000 1000 ds = prev;
1001 1001 }
1002 1002 VERIFY(zap_add_int_key(dp->dp_meta_objset,
1003 1003 scn->scn_phys.scn_queue_obj, ds->ds_object,
1004 1004 ds->ds_phys->ds_prev_snap_txg, eca->tx) == 0);
1005 1005 }
1006 1006 dsl_dataset_rele(ds, FTAG);
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1007 1007 return (0);
1008 1008 }
1009 1009
1010 1010 static void
1011 1011 dsl_scan_visitds(dsl_scan_t *scn, uint64_t dsobj, dmu_tx_t *tx)
1012 1012 {
1013 1013 dsl_pool_t *dp = scn->scn_dp;
1014 1014 dsl_dataset_t *ds;
1015 1015 objset_t *os;
1016 1016
1017 - VERIFY3U(0, ==, dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds));
1017 + VERIFY0(dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds));
1018 1018
1019 1019 if (dmu_objset_from_ds(ds, &os))
1020 1020 goto out;
1021 1021
1022 1022 /*
1023 1023 * Only the ZIL in the head (non-snapshot) is valid. Even though
1024 1024 * snapshots can have ZIL block pointers (which may be the same
1025 1025 * BP as in the head), they must be ignored. So we traverse the
1026 1026 * ZIL here, rather than in scan_recurse(), because the regular
1027 1027 * snapshot block-sharing rules don't apply to it.
1028 1028 */
1029 1029 if (DSL_SCAN_IS_SCRUB_RESILVER(scn) && !dsl_dataset_is_snapshot(ds))
1030 1030 dsl_scan_zil(dp, &os->os_zil_header);
1031 1031
1032 1032 /*
1033 1033 * Iterate over the bps in this ds.
1034 1034 */
1035 1035 dmu_buf_will_dirty(ds->ds_dbuf, tx);
1036 1036 dsl_scan_visit_rootbp(scn, ds, &ds->ds_phys->ds_bp, tx);
1037 1037
1038 1038 char *dsname = kmem_alloc(ZFS_MAXNAMELEN, KM_SLEEP);
1039 1039 dsl_dataset_name(ds, dsname);
1040 1040 zfs_dbgmsg("scanned dataset %llu (%s) with min=%llu max=%llu; "
1041 1041 "pausing=%u",
1042 1042 (longlong_t)dsobj, dsname,
1043 1043 (longlong_t)scn->scn_phys.scn_cur_min_txg,
1044 1044 (longlong_t)scn->scn_phys.scn_cur_max_txg,
1045 1045 (int)scn->scn_pausing);
1046 1046 kmem_free(dsname, ZFS_MAXNAMELEN);
1047 1047
1048 1048 if (scn->scn_pausing)
1049 1049 goto out;
1050 1050
1051 1051 /*
1052 1052 * We've finished this pass over this dataset.
1053 1053 */
1054 1054
1055 1055 /*
1056 1056 * If we did not completely visit this dataset, do another pass.
1057 1057 */
1058 1058 if (scn->scn_phys.scn_flags & DSF_VISIT_DS_AGAIN) {
1059 1059 zfs_dbgmsg("incomplete pass; visiting again");
1060 1060 scn->scn_phys.scn_flags &= ~DSF_VISIT_DS_AGAIN;
1061 1061 VERIFY(zap_add_int_key(dp->dp_meta_objset,
1062 1062 scn->scn_phys.scn_queue_obj, ds->ds_object,
1063 1063 scn->scn_phys.scn_cur_max_txg, tx) == 0);
1064 1064 goto out;
1065 1065 }
1066 1066
1067 1067 /*
1068 1068 * Add descendent datasets to work queue.
1069 1069 */
1070 1070 if (ds->ds_phys->ds_next_snap_obj != 0) {
1071 1071 VERIFY(zap_add_int_key(dp->dp_meta_objset,
1072 1072 scn->scn_phys.scn_queue_obj, ds->ds_phys->ds_next_snap_obj,
1073 1073 ds->ds_phys->ds_creation_txg, tx) == 0);
1074 1074 }
1075 1075 if (ds->ds_phys->ds_num_children > 1) {
1076 1076 boolean_t usenext = B_FALSE;
1077 1077 if (ds->ds_phys->ds_next_clones_obj != 0) {
1078 1078 uint64_t count;
1079 1079 /*
1080 1080 * A bug in a previous version of the code could
1081 1081 * cause upgrade_clones_cb() to not set
1082 1082 * ds_next_snap_obj when it should, leading to a
1083 1083 * missing entry. Therefore we can only use the
1084 1084 * next_clones_obj when its count is correct.
1085 1085 */
1086 1086 int err = zap_count(dp->dp_meta_objset,
1087 1087 ds->ds_phys->ds_next_clones_obj, &count);
1088 1088 if (err == 0 &&
1089 1089 count == ds->ds_phys->ds_num_children - 1)
1090 1090 usenext = B_TRUE;
1091 1091 }
1092 1092
1093 1093 if (usenext) {
1094 1094 VERIFY(zap_join_key(dp->dp_meta_objset,
1095 1095 ds->ds_phys->ds_next_clones_obj,
1096 1096 scn->scn_phys.scn_queue_obj,
1097 1097 ds->ds_phys->ds_creation_txg, tx) == 0);
1098 1098 } else {
1099 1099 struct enqueue_clones_arg eca;
1100 1100 eca.tx = tx;
1101 1101 eca.originobj = ds->ds_object;
1102 1102
1103 1103 (void) dmu_objset_find_spa(ds->ds_dir->dd_pool->dp_spa,
1104 1104 NULL, enqueue_clones_cb, &eca, DS_FIND_CHILDREN);
1105 1105 }
1106 1106 }
1107 1107
1108 1108 out:
1109 1109 dsl_dataset_rele(ds, FTAG);
1110 1110 }
1111 1111
1112 1112 /* ARGSUSED */
1113 1113 static int
1114 1114 enqueue_cb(spa_t *spa, uint64_t dsobj, const char *dsname, void *arg)
1115 1115 {
1116 1116 dmu_tx_t *tx = arg;
1117 1117 dsl_dataset_t *ds;
1118 1118 int err;
1119 1119 dsl_pool_t *dp = spa->spa_dsl_pool;
1120 1120 dsl_scan_t *scn = dp->dp_scan;
1121 1121
1122 1122 err = dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds);
1123 1123 if (err)
1124 1124 return (err);
1125 1125
1126 1126 while (ds->ds_phys->ds_prev_snap_obj != 0) {
1127 1127 dsl_dataset_t *prev;
1128 1128 err = dsl_dataset_hold_obj(dp, ds->ds_phys->ds_prev_snap_obj,
1129 1129 FTAG, &prev);
1130 1130 if (err) {
1131 1131 dsl_dataset_rele(ds, FTAG);
1132 1132 return (err);
1133 1133 }
1134 1134
1135 1135 /*
1136 1136 * If this is a clone, we don't need to worry about it for now.
1137 1137 */
1138 1138 if (prev->ds_phys->ds_next_snap_obj != ds->ds_object) {
1139 1139 dsl_dataset_rele(ds, FTAG);
1140 1140 dsl_dataset_rele(prev, FTAG);
1141 1141 return (0);
1142 1142 }
1143 1143 dsl_dataset_rele(ds, FTAG);
1144 1144 ds = prev;
1145 1145 }
1146 1146
1147 1147 VERIFY(zap_add_int_key(dp->dp_meta_objset, scn->scn_phys.scn_queue_obj,
1148 1148 ds->ds_object, ds->ds_phys->ds_prev_snap_txg, tx) == 0);
1149 1149 dsl_dataset_rele(ds, FTAG);
1150 1150 return (0);
1151 1151 }
1152 1152
1153 1153 /*
1154 1154 * Scrub/dedup interaction.
1155 1155 *
1156 1156 * If there are N references to a deduped block, we don't want to scrub it
1157 1157 * N times -- ideally, we should scrub it exactly once.
1158 1158 *
1159 1159 * We leverage the fact that the dde's replication class (enum ddt_class)
1160 1160 * is ordered from highest replication class (DDT_CLASS_DITTO) to lowest
1161 1161 * (DDT_CLASS_UNIQUE) so that we may walk the DDT in that order.
1162 1162 *
1163 1163 * To prevent excess scrubbing, the scrub begins by walking the DDT
1164 1164 * to find all blocks with refcnt > 1, and scrubs each of these once.
1165 1165 * Since there are two replication classes which contain blocks with
1166 1166 * refcnt > 1, we scrub the highest replication class (DDT_CLASS_DITTO) first.
1167 1167 * Finally the top-down scrub begins, only visiting blocks with refcnt == 1.
1168 1168 *
1169 1169 * There would be nothing more to say if a block's refcnt couldn't change
1170 1170 * during a scrub, but of course it can so we must account for changes
1171 1171 * in a block's replication class.
1172 1172 *
1173 1173 * Here's an example of what can occur:
1174 1174 *
1175 1175 * If a block has refcnt > 1 during the DDT scrub phase, but has refcnt == 1
1176 1176 * when visited during the top-down scrub phase, it will be scrubbed twice.
1177 1177 * This negates our scrub optimization, but is otherwise harmless.
1178 1178 *
1179 1179 * If a block has refcnt == 1 during the DDT scrub phase, but has refcnt > 1
1180 1180 * on each visit during the top-down scrub phase, it will never be scrubbed.
1181 1181 * To catch this, ddt_sync_entry() notifies the scrub code whenever a block's
1182 1182 * reference class transitions to a higher level (i.e DDT_CLASS_UNIQUE to
1183 1183 * DDT_CLASS_DUPLICATE); if it transitions from refcnt == 1 to refcnt > 1
1184 1184 * while a scrub is in progress, it scrubs the block right then.
1185 1185 */
1186 1186 static void
1187 1187 dsl_scan_ddt(dsl_scan_t *scn, dmu_tx_t *tx)
1188 1188 {
1189 1189 ddt_bookmark_t *ddb = &scn->scn_phys.scn_ddt_bookmark;
1190 1190 ddt_entry_t dde = { 0 };
1191 1191 int error;
1192 1192 uint64_t n = 0;
1193 1193
1194 1194 while ((error = ddt_walk(scn->scn_dp->dp_spa, ddb, &dde)) == 0) {
1195 1195 ddt_t *ddt;
1196 1196
1197 1197 if (ddb->ddb_class > scn->scn_phys.scn_ddt_class_max)
1198 1198 break;
1199 1199 dprintf("visiting ddb=%llu/%llu/%llu/%llx\n",
1200 1200 (longlong_t)ddb->ddb_class,
1201 1201 (longlong_t)ddb->ddb_type,
1202 1202 (longlong_t)ddb->ddb_checksum,
1203 1203 (longlong_t)ddb->ddb_cursor);
1204 1204
1205 1205 /* There should be no pending changes to the dedup table */
1206 1206 ddt = scn->scn_dp->dp_spa->spa_ddt[ddb->ddb_checksum];
1207 1207 ASSERT(avl_first(&ddt->ddt_tree) == NULL);
1208 1208
1209 1209 dsl_scan_ddt_entry(scn, ddb->ddb_checksum, &dde, tx);
1210 1210 n++;
1211 1211
1212 1212 if (dsl_scan_check_pause(scn, NULL))
1213 1213 break;
1214 1214 }
1215 1215
1216 1216 zfs_dbgmsg("scanned %llu ddt entries with class_max = %u; pausing=%u",
1217 1217 (longlong_t)n, (int)scn->scn_phys.scn_ddt_class_max,
1218 1218 (int)scn->scn_pausing);
1219 1219
1220 1220 ASSERT(error == 0 || error == ENOENT);
1221 1221 ASSERT(error != ENOENT ||
1222 1222 ddb->ddb_class > scn->scn_phys.scn_ddt_class_max);
1223 1223 }
1224 1224
1225 1225 /* ARGSUSED */
1226 1226 void
1227 1227 dsl_scan_ddt_entry(dsl_scan_t *scn, enum zio_checksum checksum,
1228 1228 ddt_entry_t *dde, dmu_tx_t *tx)
1229 1229 {
1230 1230 const ddt_key_t *ddk = &dde->dde_key;
1231 1231 ddt_phys_t *ddp = dde->dde_phys;
1232 1232 blkptr_t bp;
1233 1233 zbookmark_t zb = { 0 };
1234 1234
1235 1235 if (scn->scn_phys.scn_state != DSS_SCANNING)
1236 1236 return;
1237 1237
1238 1238 for (int p = 0; p < DDT_PHYS_TYPES; p++, ddp++) {
1239 1239 if (ddp->ddp_phys_birth == 0 ||
1240 1240 ddp->ddp_phys_birth > scn->scn_phys.scn_cur_max_txg)
1241 1241 continue;
1242 1242 ddt_bp_create(checksum, ddk, ddp, &bp);
1243 1243
1244 1244 scn->scn_visited_this_txg++;
1245 1245 scan_funcs[scn->scn_phys.scn_func](scn->scn_dp, &bp, &zb);
1246 1246 }
1247 1247 }
1248 1248
1249 1249 static void
1250 1250 dsl_scan_visit(dsl_scan_t *scn, dmu_tx_t *tx)
1251 1251 {
1252 1252 dsl_pool_t *dp = scn->scn_dp;
1253 1253 zap_cursor_t zc;
1254 1254 zap_attribute_t za;
1255 1255
1256 1256 if (scn->scn_phys.scn_ddt_bookmark.ddb_class <=
1257 1257 scn->scn_phys.scn_ddt_class_max) {
1258 1258 scn->scn_phys.scn_cur_min_txg = scn->scn_phys.scn_min_txg;
1259 1259 scn->scn_phys.scn_cur_max_txg = scn->scn_phys.scn_max_txg;
1260 1260 dsl_scan_ddt(scn, tx);
1261 1261 if (scn->scn_pausing)
1262 1262 return;
1263 1263 }
1264 1264
1265 1265 if (scn->scn_phys.scn_bookmark.zb_objset == DMU_META_OBJSET) {
1266 1266 /* First do the MOS & ORIGIN */
1267 1267
1268 1268 scn->scn_phys.scn_cur_min_txg = scn->scn_phys.scn_min_txg;
1269 1269 scn->scn_phys.scn_cur_max_txg = scn->scn_phys.scn_max_txg;
1270 1270 dsl_scan_visit_rootbp(scn, NULL,
1271 1271 &dp->dp_meta_rootbp, tx);
1272 1272 spa_set_rootblkptr(dp->dp_spa, &dp->dp_meta_rootbp);
1273 1273 if (scn->scn_pausing)
1274 1274 return;
1275 1275
1276 1276 if (spa_version(dp->dp_spa) < SPA_VERSION_DSL_SCRUB) {
1277 1277 VERIFY(0 == dmu_objset_find_spa(dp->dp_spa,
1278 1278 NULL, enqueue_cb, tx, DS_FIND_CHILDREN));
1279 1279 } else {
1280 1280 dsl_scan_visitds(scn,
1281 1281 dp->dp_origin_snap->ds_object, tx);
1282 1282 }
1283 1283 ASSERT(!scn->scn_pausing);
1284 1284 } else if (scn->scn_phys.scn_bookmark.zb_objset !=
1285 1285 ZB_DESTROYED_OBJSET) {
1286 1286 /*
1287 1287 * If we were paused, continue from here. Note if the
1288 1288 * ds we were paused on was deleted, the zb_objset may
1289 1289 * be -1, so we will skip this and find a new objset
1290 1290 * below.
1291 1291 */
1292 1292 dsl_scan_visitds(scn, scn->scn_phys.scn_bookmark.zb_objset, tx);
1293 1293 if (scn->scn_pausing)
1294 1294 return;
1295 1295 }
1296 1296
1297 1297 /*
1298 1298 * In case we were paused right at the end of the ds, zero the
1299 1299 * bookmark so we don't think that we're still trying to resume.
1300 1300 */
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1301 1301 bzero(&scn->scn_phys.scn_bookmark, sizeof (zbookmark_t));
1302 1302
1303 1303 /* keep pulling things out of the zap-object-as-queue */
1304 1304 while (zap_cursor_init(&zc, dp->dp_meta_objset,
1305 1305 scn->scn_phys.scn_queue_obj),
1306 1306 zap_cursor_retrieve(&zc, &za) == 0) {
1307 1307 dsl_dataset_t *ds;
1308 1308 uint64_t dsobj;
1309 1309
1310 1310 dsobj = strtonum(za.za_name, NULL);
1311 - VERIFY3U(0, ==, zap_remove_int(dp->dp_meta_objset,
1311 + VERIFY0(zap_remove_int(dp->dp_meta_objset,
1312 1312 scn->scn_phys.scn_queue_obj, dsobj, tx));
1313 1313
1314 1314 /* Set up min/max txg */
1315 - VERIFY3U(0, ==, dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds));
1315 + VERIFY0(dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds));
1316 1316 if (za.za_first_integer != 0) {
1317 1317 scn->scn_phys.scn_cur_min_txg =
1318 1318 MAX(scn->scn_phys.scn_min_txg,
1319 1319 za.za_first_integer);
1320 1320 } else {
1321 1321 scn->scn_phys.scn_cur_min_txg =
1322 1322 MAX(scn->scn_phys.scn_min_txg,
1323 1323 ds->ds_phys->ds_prev_snap_txg);
1324 1324 }
1325 1325 scn->scn_phys.scn_cur_max_txg = dsl_scan_ds_maxtxg(ds);
1326 1326 dsl_dataset_rele(ds, FTAG);
1327 1327
1328 1328 dsl_scan_visitds(scn, dsobj, tx);
1329 1329 zap_cursor_fini(&zc);
1330 1330 if (scn->scn_pausing)
1331 1331 return;
1332 1332 }
1333 1333 zap_cursor_fini(&zc);
1334 1334 }
1335 1335
1336 1336 static boolean_t
1337 1337 dsl_scan_free_should_pause(dsl_scan_t *scn)
1338 1338 {
1339 1339 uint64_t elapsed_nanosecs;
1340 1340
1341 1341 elapsed_nanosecs = gethrtime() - scn->scn_sync_start_time;
1342 1342 return (elapsed_nanosecs / NANOSEC > zfs_txg_timeout ||
1343 1343 (elapsed_nanosecs / MICROSEC > zfs_free_min_time_ms &&
1344 1344 txg_sync_waiting(scn->scn_dp)) ||
1345 1345 spa_shutting_down(scn->scn_dp->dp_spa));
1346 1346 }
1347 1347
1348 1348 static int
1349 1349 dsl_scan_free_block_cb(void *arg, const blkptr_t *bp, dmu_tx_t *tx)
1350 1350 {
1351 1351 dsl_scan_t *scn = arg;
1352 1352
1353 1353 if (!scn->scn_is_bptree ||
1354 1354 (BP_GET_LEVEL(bp) == 0 && BP_GET_TYPE(bp) != DMU_OT_OBJSET)) {
1355 1355 if (dsl_scan_free_should_pause(scn))
1356 1356 return (ERESTART);
1357 1357 }
1358 1358
1359 1359 zio_nowait(zio_free_sync(scn->scn_zio_root, scn->scn_dp->dp_spa,
1360 1360 dmu_tx_get_txg(tx), bp, 0));
1361 1361 dsl_dir_diduse_space(tx->tx_pool->dp_free_dir, DD_USED_HEAD,
1362 1362 -bp_get_dsize_sync(scn->scn_dp->dp_spa, bp),
1363 1363 -BP_GET_PSIZE(bp), -BP_GET_UCSIZE(bp), tx);
1364 1364 scn->scn_visited_this_txg++;
1365 1365 return (0);
1366 1366 }
1367 1367
1368 1368 boolean_t
1369 1369 dsl_scan_active(dsl_scan_t *scn)
1370 1370 {
1371 1371 spa_t *spa = scn->scn_dp->dp_spa;
1372 1372 uint64_t used = 0, comp, uncomp;
1373 1373
1374 1374 if (spa->spa_load_state != SPA_LOAD_NONE)
1375 1375 return (B_FALSE);
1376 1376 if (spa_shutting_down(spa))
1377 1377 return (B_FALSE);
1378 1378
1379 1379 if (scn->scn_phys.scn_state == DSS_SCANNING)
1380 1380 return (B_TRUE);
1381 1381
1382 1382 if (spa_feature_is_active(spa,
1383 1383 &spa_feature_table[SPA_FEATURE_ASYNC_DESTROY])) {
1384 1384 return (B_TRUE);
1385 1385 }
1386 1386 if (spa_version(scn->scn_dp->dp_spa) >= SPA_VERSION_DEADLISTS) {
1387 1387 (void) bpobj_space(&scn->scn_dp->dp_free_bpobj,
1388 1388 &used, &comp, &uncomp);
1389 1389 }
1390 1390 return (used != 0);
1391 1391 }
1392 1392
1393 1393 void
1394 1394 dsl_scan_sync(dsl_pool_t *dp, dmu_tx_t *tx)
1395 1395 {
1396 1396 dsl_scan_t *scn = dp->dp_scan;
1397 1397 spa_t *spa = dp->dp_spa;
1398 1398 int err;
1399 1399
1400 1400 /*
1401 1401 * Check for scn_restart_txg before checking spa_load_state, so
1402 1402 * that we can restart an old-style scan while the pool is being
1403 1403 * imported (see dsl_scan_init).
1404 1404 */
1405 1405 if (scn->scn_restart_txg != 0 &&
1406 1406 scn->scn_restart_txg <= tx->tx_txg) {
1407 1407 pool_scan_func_t func = POOL_SCAN_SCRUB;
1408 1408 dsl_scan_done(scn, B_FALSE, tx);
1409 1409 if (vdev_resilver_needed(spa->spa_root_vdev, NULL, NULL))
1410 1410 func = POOL_SCAN_RESILVER;
1411 1411 zfs_dbgmsg("restarting scan func=%u txg=%llu",
1412 1412 func, tx->tx_txg);
1413 1413 dsl_scan_setup_sync(scn, &func, tx);
1414 1414 }
1415 1415
1416 1416 if (!dsl_scan_active(scn) ||
1417 1417 spa_sync_pass(dp->dp_spa) > 1)
1418 1418 return;
1419 1419
1420 1420 scn->scn_visited_this_txg = 0;
1421 1421 scn->scn_pausing = B_FALSE;
1422 1422 scn->scn_sync_start_time = gethrtime();
1423 1423 spa->spa_scrub_active = B_TRUE;
1424 1424
1425 1425 /*
1426 1426 * First process the free list. If we pause the free, don't do
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1427 1427 * any scanning. This ensures that there is no free list when
1428 1428 * we are scanning, so the scan code doesn't have to worry about
1429 1429 * traversing it.
1430 1430 */
1431 1431 if (spa_version(dp->dp_spa) >= SPA_VERSION_DEADLISTS) {
1432 1432 scn->scn_is_bptree = B_FALSE;
1433 1433 scn->scn_zio_root = zio_root(dp->dp_spa, NULL,
1434 1434 NULL, ZIO_FLAG_MUSTSUCCEED);
1435 1435 err = bpobj_iterate(&dp->dp_free_bpobj,
1436 1436 dsl_scan_free_block_cb, scn, tx);
1437 - VERIFY3U(0, ==, zio_wait(scn->scn_zio_root));
1437 + VERIFY0(zio_wait(scn->scn_zio_root));
1438 1438
1439 1439 if (err == 0 && spa_feature_is_active(spa,
1440 1440 &spa_feature_table[SPA_FEATURE_ASYNC_DESTROY])) {
1441 1441 scn->scn_is_bptree = B_TRUE;
1442 1442 scn->scn_zio_root = zio_root(dp->dp_spa, NULL,
1443 1443 NULL, ZIO_FLAG_MUSTSUCCEED);
1444 1444 err = bptree_iterate(dp->dp_meta_objset,
1445 1445 dp->dp_bptree_obj, B_TRUE, dsl_scan_free_block_cb,
1446 1446 scn, tx);
1447 - VERIFY3U(0, ==, zio_wait(scn->scn_zio_root));
1447 + VERIFY0(zio_wait(scn->scn_zio_root));
1448 1448 if (err != 0)
1449 1449 return;
1450 1450
1451 1451 /* disable async destroy feature */
1452 1452 spa_feature_decr(spa,
1453 1453 &spa_feature_table[SPA_FEATURE_ASYNC_DESTROY], tx);
1454 1454 ASSERT(!spa_feature_is_active(spa,
1455 1455 &spa_feature_table[SPA_FEATURE_ASYNC_DESTROY]));
1456 - VERIFY3U(0, ==, zap_remove(dp->dp_meta_objset,
1456 + VERIFY0(zap_remove(dp->dp_meta_objset,
1457 1457 DMU_POOL_DIRECTORY_OBJECT,
1458 1458 DMU_POOL_BPTREE_OBJ, tx));
1459 - VERIFY3U(0, ==, bptree_free(dp->dp_meta_objset,
1459 + VERIFY0(bptree_free(dp->dp_meta_objset,
1460 1460 dp->dp_bptree_obj, tx));
1461 1461 dp->dp_bptree_obj = 0;
1462 1462 }
1463 1463 if (scn->scn_visited_this_txg) {
1464 1464 zfs_dbgmsg("freed %llu blocks in %llums from "
1465 1465 "free_bpobj/bptree txg %llu",
1466 1466 (longlong_t)scn->scn_visited_this_txg,
1467 1467 (longlong_t)
1468 1468 (gethrtime() - scn->scn_sync_start_time) / MICROSEC,
1469 1469 (longlong_t)tx->tx_txg);
1470 1470 scn->scn_visited_this_txg = 0;
1471 1471 /*
1472 1472 * Re-sync the ddt so that we can further modify
1473 1473 * it when doing bprewrite.
1474 1474 */
1475 1475 ddt_sync(spa, tx->tx_txg);
1476 1476 }
1477 1477 if (err == ERESTART)
1478 1478 return;
1479 1479 }
1480 1480
1481 1481 if (scn->scn_phys.scn_state != DSS_SCANNING)
1482 1482 return;
1483 1483
1484 1484 if (scn->scn_phys.scn_ddt_bookmark.ddb_class <=
1485 1485 scn->scn_phys.scn_ddt_class_max) {
1486 1486 zfs_dbgmsg("doing scan sync txg %llu; "
1487 1487 "ddt bm=%llu/%llu/%llu/%llx",
1488 1488 (longlong_t)tx->tx_txg,
1489 1489 (longlong_t)scn->scn_phys.scn_ddt_bookmark.ddb_class,
1490 1490 (longlong_t)scn->scn_phys.scn_ddt_bookmark.ddb_type,
1491 1491 (longlong_t)scn->scn_phys.scn_ddt_bookmark.ddb_checksum,
1492 1492 (longlong_t)scn->scn_phys.scn_ddt_bookmark.ddb_cursor);
1493 1493 ASSERT(scn->scn_phys.scn_bookmark.zb_objset == 0);
1494 1494 ASSERT(scn->scn_phys.scn_bookmark.zb_object == 0);
1495 1495 ASSERT(scn->scn_phys.scn_bookmark.zb_level == 0);
1496 1496 ASSERT(scn->scn_phys.scn_bookmark.zb_blkid == 0);
1497 1497 } else {
1498 1498 zfs_dbgmsg("doing scan sync txg %llu; bm=%llu/%llu/%llu/%llu",
1499 1499 (longlong_t)tx->tx_txg,
1500 1500 (longlong_t)scn->scn_phys.scn_bookmark.zb_objset,
1501 1501 (longlong_t)scn->scn_phys.scn_bookmark.zb_object,
1502 1502 (longlong_t)scn->scn_phys.scn_bookmark.zb_level,
1503 1503 (longlong_t)scn->scn_phys.scn_bookmark.zb_blkid);
1504 1504 }
1505 1505
1506 1506 scn->scn_zio_root = zio_root(dp->dp_spa, NULL,
1507 1507 NULL, ZIO_FLAG_CANFAIL);
1508 1508 dsl_scan_visit(scn, tx);
1509 1509 (void) zio_wait(scn->scn_zio_root);
1510 1510 scn->scn_zio_root = NULL;
1511 1511
1512 1512 zfs_dbgmsg("visited %llu blocks in %llums",
1513 1513 (longlong_t)scn->scn_visited_this_txg,
1514 1514 (longlong_t)(gethrtime() - scn->scn_sync_start_time) / MICROSEC);
1515 1515
1516 1516 if (!scn->scn_pausing) {
1517 1517 /* finished with scan. */
1518 1518 zfs_dbgmsg("finished scan txg %llu", (longlong_t)tx->tx_txg);
1519 1519 dsl_scan_done(scn, B_TRUE, tx);
1520 1520 }
1521 1521
1522 1522 if (DSL_SCAN_IS_SCRUB_RESILVER(scn)) {
1523 1523 mutex_enter(&spa->spa_scrub_lock);
1524 1524 while (spa->spa_scrub_inflight > 0) {
1525 1525 cv_wait(&spa->spa_scrub_io_cv,
1526 1526 &spa->spa_scrub_lock);
1527 1527 }
1528 1528 mutex_exit(&spa->spa_scrub_lock);
1529 1529 }
1530 1530
1531 1531 dsl_scan_sync_state(scn, tx);
1532 1532 }
1533 1533
1534 1534 /*
1535 1535 * This will start a new scan, or restart an existing one.
1536 1536 */
1537 1537 void
1538 1538 dsl_resilver_restart(dsl_pool_t *dp, uint64_t txg)
1539 1539 {
1540 1540 if (txg == 0) {
1541 1541 dmu_tx_t *tx;
1542 1542 tx = dmu_tx_create_dd(dp->dp_mos_dir);
1543 1543 VERIFY(0 == dmu_tx_assign(tx, TXG_WAIT));
1544 1544
1545 1545 txg = dmu_tx_get_txg(tx);
1546 1546 dp->dp_scan->scn_restart_txg = txg;
1547 1547 dmu_tx_commit(tx);
1548 1548 } else {
1549 1549 dp->dp_scan->scn_restart_txg = txg;
1550 1550 }
1551 1551 zfs_dbgmsg("restarting resilver txg=%llu", txg);
1552 1552 }
1553 1553
1554 1554 boolean_t
1555 1555 dsl_scan_resilvering(dsl_pool_t *dp)
1556 1556 {
1557 1557 return (dp->dp_scan->scn_phys.scn_state == DSS_SCANNING &&
1558 1558 dp->dp_scan->scn_phys.scn_func == POOL_SCAN_RESILVER);
1559 1559 }
1560 1560
1561 1561 /*
1562 1562 * scrub consumers
1563 1563 */
1564 1564
1565 1565 static void
1566 1566 count_block(zfs_all_blkstats_t *zab, const blkptr_t *bp)
1567 1567 {
1568 1568 int i;
1569 1569
1570 1570 /*
1571 1571 * If we resume after a reboot, zab will be NULL; don't record
1572 1572 * incomplete stats in that case.
1573 1573 */
1574 1574 if (zab == NULL)
1575 1575 return;
1576 1576
1577 1577 for (i = 0; i < 4; i++) {
1578 1578 int l = (i < 2) ? BP_GET_LEVEL(bp) : DN_MAX_LEVELS;
1579 1579 int t = (i & 1) ? BP_GET_TYPE(bp) : DMU_OT_TOTAL;
1580 1580 if (t & DMU_OT_NEWTYPE)
1581 1581 t = DMU_OT_OTHER;
1582 1582 zfs_blkstat_t *zb = &zab->zab_type[l][t];
1583 1583 int equal;
1584 1584
1585 1585 zb->zb_count++;
1586 1586 zb->zb_asize += BP_GET_ASIZE(bp);
1587 1587 zb->zb_lsize += BP_GET_LSIZE(bp);
1588 1588 zb->zb_psize += BP_GET_PSIZE(bp);
1589 1589 zb->zb_gangs += BP_COUNT_GANG(bp);
1590 1590
1591 1591 switch (BP_GET_NDVAS(bp)) {
1592 1592 case 2:
1593 1593 if (DVA_GET_VDEV(&bp->blk_dva[0]) ==
1594 1594 DVA_GET_VDEV(&bp->blk_dva[1]))
1595 1595 zb->zb_ditto_2_of_2_samevdev++;
1596 1596 break;
1597 1597 case 3:
1598 1598 equal = (DVA_GET_VDEV(&bp->blk_dva[0]) ==
1599 1599 DVA_GET_VDEV(&bp->blk_dva[1])) +
1600 1600 (DVA_GET_VDEV(&bp->blk_dva[0]) ==
1601 1601 DVA_GET_VDEV(&bp->blk_dva[2])) +
1602 1602 (DVA_GET_VDEV(&bp->blk_dva[1]) ==
1603 1603 DVA_GET_VDEV(&bp->blk_dva[2]));
1604 1604 if (equal == 1)
1605 1605 zb->zb_ditto_2_of_3_samevdev++;
1606 1606 else if (equal == 3)
1607 1607 zb->zb_ditto_3_of_3_samevdev++;
1608 1608 break;
1609 1609 }
1610 1610 }
1611 1611 }
1612 1612
1613 1613 static void
1614 1614 dsl_scan_scrub_done(zio_t *zio)
1615 1615 {
1616 1616 spa_t *spa = zio->io_spa;
1617 1617
1618 1618 zio_data_buf_free(zio->io_data, zio->io_size);
1619 1619
1620 1620 mutex_enter(&spa->spa_scrub_lock);
1621 1621 spa->spa_scrub_inflight--;
1622 1622 cv_broadcast(&spa->spa_scrub_io_cv);
1623 1623
1624 1624 if (zio->io_error && (zio->io_error != ECKSUM ||
1625 1625 !(zio->io_flags & ZIO_FLAG_SPECULATIVE))) {
1626 1626 spa->spa_dsl_pool->dp_scan->scn_phys.scn_errors++;
1627 1627 }
1628 1628 mutex_exit(&spa->spa_scrub_lock);
1629 1629 }
1630 1630
1631 1631 static int
1632 1632 dsl_scan_scrub_cb(dsl_pool_t *dp,
1633 1633 const blkptr_t *bp, const zbookmark_t *zb)
1634 1634 {
1635 1635 dsl_scan_t *scn = dp->dp_scan;
1636 1636 size_t size = BP_GET_PSIZE(bp);
1637 1637 spa_t *spa = dp->dp_spa;
1638 1638 uint64_t phys_birth = BP_PHYSICAL_BIRTH(bp);
1639 1639 boolean_t needs_io;
1640 1640 int zio_flags = ZIO_FLAG_SCAN_THREAD | ZIO_FLAG_RAW | ZIO_FLAG_CANFAIL;
1641 1641 int zio_priority;
1642 1642 int scan_delay = 0;
1643 1643
1644 1644 if (phys_birth <= scn->scn_phys.scn_min_txg ||
1645 1645 phys_birth >= scn->scn_phys.scn_max_txg)
1646 1646 return (0);
1647 1647
1648 1648 count_block(dp->dp_blkstats, bp);
1649 1649
1650 1650 ASSERT(DSL_SCAN_IS_SCRUB_RESILVER(scn));
1651 1651 if (scn->scn_phys.scn_func == POOL_SCAN_SCRUB) {
1652 1652 zio_flags |= ZIO_FLAG_SCRUB;
1653 1653 zio_priority = ZIO_PRIORITY_SCRUB;
1654 1654 needs_io = B_TRUE;
1655 1655 scan_delay = zfs_scrub_delay;
1656 1656 } else if (scn->scn_phys.scn_func == POOL_SCAN_RESILVER) {
1657 1657 zio_flags |= ZIO_FLAG_RESILVER;
1658 1658 zio_priority = ZIO_PRIORITY_RESILVER;
1659 1659 needs_io = B_FALSE;
1660 1660 scan_delay = zfs_resilver_delay;
1661 1661 }
1662 1662
1663 1663 /* If it's an intent log block, failure is expected. */
1664 1664 if (zb->zb_level == ZB_ZIL_LEVEL)
1665 1665 zio_flags |= ZIO_FLAG_SPECULATIVE;
1666 1666
1667 1667 for (int d = 0; d < BP_GET_NDVAS(bp); d++) {
1668 1668 vdev_t *vd = vdev_lookup_top(spa,
1669 1669 DVA_GET_VDEV(&bp->blk_dva[d]));
1670 1670
1671 1671 /*
1672 1672 * Keep track of how much data we've examined so that
1673 1673 * zpool(1M) status can make useful progress reports.
1674 1674 */
1675 1675 scn->scn_phys.scn_examined += DVA_GET_ASIZE(&bp->blk_dva[d]);
1676 1676 spa->spa_scan_pass_exam += DVA_GET_ASIZE(&bp->blk_dva[d]);
1677 1677
1678 1678 /* if it's a resilver, this may not be in the target range */
1679 1679 if (!needs_io) {
1680 1680 if (DVA_GET_GANG(&bp->blk_dva[d])) {
1681 1681 /*
1682 1682 * Gang members may be spread across multiple
1683 1683 * vdevs, so the best estimate we have is the
1684 1684 * scrub range, which has already been checked.
1685 1685 * XXX -- it would be better to change our
1686 1686 * allocation policy to ensure that all
1687 1687 * gang members reside on the same vdev.
1688 1688 */
1689 1689 needs_io = B_TRUE;
1690 1690 } else {
1691 1691 needs_io = vdev_dtl_contains(vd, DTL_PARTIAL,
1692 1692 phys_birth, 1);
1693 1693 }
1694 1694 }
1695 1695 }
1696 1696
1697 1697 if (needs_io && !zfs_no_scrub_io) {
1698 1698 vdev_t *rvd = spa->spa_root_vdev;
1699 1699 uint64_t maxinflight = rvd->vdev_children * zfs_top_maxinflight;
1700 1700 void *data = zio_data_buf_alloc(size);
1701 1701
1702 1702 mutex_enter(&spa->spa_scrub_lock);
1703 1703 while (spa->spa_scrub_inflight >= maxinflight)
1704 1704 cv_wait(&spa->spa_scrub_io_cv, &spa->spa_scrub_lock);
1705 1705 spa->spa_scrub_inflight++;
1706 1706 mutex_exit(&spa->spa_scrub_lock);
1707 1707
1708 1708 /*
1709 1709 * If we're seeing recent (zfs_scan_idle) "important" I/Os
1710 1710 * then throttle our workload to limit the impact of a scan.
1711 1711 */
1712 1712 if (ddi_get_lbolt64() - spa->spa_last_io <= zfs_scan_idle)
1713 1713 delay(scan_delay);
1714 1714
1715 1715 zio_nowait(zio_read(NULL, spa, bp, data, size,
1716 1716 dsl_scan_scrub_done, NULL, zio_priority,
1717 1717 zio_flags, zb));
1718 1718 }
1719 1719
1720 1720 /* do not relocate this block */
1721 1721 return (0);
1722 1722 }
1723 1723
1724 1724 int
1725 1725 dsl_scan(dsl_pool_t *dp, pool_scan_func_t func)
1726 1726 {
1727 1727 spa_t *spa = dp->dp_spa;
1728 1728
1729 1729 /*
1730 1730 * Purge all vdev caches and probe all devices. We do this here
1731 1731 * rather than in sync context because this requires a writer lock
1732 1732 * on the spa_config lock, which we can't do from sync context. The
1733 1733 * spa_scrub_reopen flag indicates that vdev_open() should not
1734 1734 * attempt to start another scrub.
1735 1735 */
1736 1736 spa_vdev_state_enter(spa, SCL_NONE);
1737 1737 spa->spa_scrub_reopen = B_TRUE;
1738 1738 vdev_reopen(spa->spa_root_vdev);
1739 1739 spa->spa_scrub_reopen = B_FALSE;
1740 1740 (void) spa_vdev_state_exit(spa, NULL, 0);
1741 1741
1742 1742 return (dsl_sync_task_do(dp, dsl_scan_setup_check,
1743 1743 dsl_scan_setup_sync, dp->dp_scan, &func, 0));
1744 1744 }
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