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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) 2008, 2010, Oracle and/or its affiliates. All rights reserved. | |
23 | */ | |
24 | ||
25 | #include <sys/dsl_scan.h> | |
26 | #include <sys/dsl_pool.h> | |
27 | #include <sys/dsl_dataset.h> | |
28 | #include <sys/dsl_prop.h> | |
29 | #include <sys/dsl_dir.h> | |
30 | #include <sys/dsl_synctask.h> | |
31 | #include <sys/dnode.h> | |
32 | #include <sys/dmu_tx.h> | |
33 | #include <sys/dmu_objset.h> | |
34 | #include <sys/arc.h> | |
35 | #include <sys/zap.h> | |
36 | #include <sys/zio.h> | |
37 | #include <sys/zfs_context.h> | |
38 | #include <sys/fs/zfs.h> | |
39 | #include <sys/zfs_znode.h> | |
40 | #include <sys/spa_impl.h> | |
41 | #include <sys/vdev_impl.h> | |
42 | #include <sys/zil_impl.h> | |
43 | #include <sys/zio_checksum.h> | |
44 | #include <sys/ddt.h> | |
45 | #include <sys/sa.h> | |
46 | #include <sys/sa_impl.h> | |
47 | #ifdef _KERNEL | |
48 | #include <sys/zfs_vfsops.h> | |
49 | #endif | |
50 | ||
51 | typedef int (scan_cb_t)(dsl_pool_t *, const blkptr_t *, const zbookmark_t *); | |
52 | ||
53 | static scan_cb_t dsl_scan_defrag_cb; | |
54 | static scan_cb_t dsl_scan_scrub_cb; | |
55 | static scan_cb_t dsl_scan_remove_cb; | |
56 | static dsl_syncfunc_t dsl_scan_cancel_sync; | |
57 | static void dsl_scan_sync_state(dsl_scan_t *, dmu_tx_t *tx); | |
58 | ||
59 | int zfs_scan_min_time_ms = 1000; /* min millisecs to scrub per txg */ | |
60 | int zfs_free_min_time_ms = 1000; /* min millisecs to free per txg */ | |
61 | int zfs_resilver_min_time_ms = 3000; /* min millisecs to resilver per txg */ | |
62 | boolean_t zfs_no_scrub_io = B_FALSE; /* set to disable scrub i/o */ | |
63 | boolean_t zfs_no_scrub_prefetch = B_FALSE; /* set to disable srub prefetching */ | |
64 | enum ddt_class zfs_scrub_ddt_class_max = DDT_CLASS_DUPLICATE; | |
65 | int dsl_scan_delay_completion = B_FALSE; /* set to delay scan completion */ | |
66 | ||
67 | #define DSL_SCAN_IS_SCRUB_RESILVER(scn) \ | |
68 | ((scn)->scn_phys.scn_func == POOL_SCAN_SCRUB || \ | |
69 | (scn)->scn_phys.scn_func == POOL_SCAN_RESILVER) | |
70 | ||
71 | extern int zfs_txg_timeout; | |
72 | ||
73 | /* the order has to match pool_scan_type */ | |
74 | static scan_cb_t *scan_funcs[POOL_SCAN_FUNCS] = { | |
75 | NULL, | |
76 | dsl_scan_scrub_cb, /* POOL_SCAN_SCRUB */ | |
77 | dsl_scan_scrub_cb, /* POOL_SCAN_RESILVER */ | |
78 | }; | |
79 | ||
80 | int | |
81 | dsl_scan_init(dsl_pool_t *dp, uint64_t txg) | |
82 | { | |
83 | int err; | |
84 | dsl_scan_t *scn; | |
85 | spa_t *spa = dp->dp_spa; | |
86 | uint64_t f; | |
87 | ||
88 | scn = dp->dp_scan = kmem_zalloc(sizeof (dsl_scan_t), KM_SLEEP); | |
89 | scn->scn_dp = dp; | |
90 | ||
91 | err = zap_lookup(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT, | |
92 | "scrub_func", sizeof (uint64_t), 1, &f); | |
93 | if (err == 0) { | |
94 | /* | |
95 | * There was an old-style scrub in progress. Restart a | |
96 | * new-style scrub from the beginning. | |
97 | */ | |
98 | scn->scn_restart_txg = txg; | |
99 | zfs_dbgmsg("old-style scrub was in progress; " | |
100 | "restarting new-style scrub in txg %llu", | |
101 | scn->scn_restart_txg); | |
102 | ||
103 | /* | |
104 | * Load the queue obj from the old location so that it | |
105 | * can be freed by dsl_scan_done(). | |
106 | */ | |
107 | (void) zap_lookup(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT, | |
108 | "scrub_queue", sizeof (uint64_t), 1, | |
109 | &scn->scn_phys.scn_queue_obj); | |
110 | } else { | |
111 | err = zap_lookup(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT, | |
112 | DMU_POOL_SCAN, sizeof (uint64_t), SCAN_PHYS_NUMINTS, | |
113 | &scn->scn_phys); | |
114 | if (err == ENOENT) | |
115 | return (0); | |
116 | else if (err) | |
117 | return (err); | |
118 | ||
119 | if (scn->scn_phys.scn_state == DSS_SCANNING && | |
120 | spa_prev_software_version(dp->dp_spa) < SPA_VERSION_SCAN) { | |
121 | /* | |
122 | * A new-type scrub was in progress on an old | |
123 | * pool, and the pool was accessed by old | |
124 | * software. Restart from the beginning, since | |
125 | * the old software may have changed the pool in | |
126 | * the meantime. | |
127 | */ | |
128 | scn->scn_restart_txg = txg; | |
129 | zfs_dbgmsg("new-style scrub was modified " | |
130 | "by old software; restarting in txg %llu", | |
131 | scn->scn_restart_txg); | |
132 | } | |
133 | } | |
134 | ||
135 | spa_scan_stat_init(spa); | |
136 | return (0); | |
137 | } | |
138 | ||
139 | void | |
140 | dsl_scan_fini(dsl_pool_t *dp) | |
141 | { | |
142 | if (dp->dp_scan) { | |
143 | kmem_free(dp->dp_scan, sizeof (dsl_scan_t)); | |
144 | dp->dp_scan = NULL; | |
145 | } | |
146 | } | |
147 | ||
148 | /* ARGSUSED */ | |
149 | static int | |
150 | dsl_scan_setup_check(void *arg1, void *arg2, dmu_tx_t *tx) | |
151 | { | |
152 | dsl_scan_t *scn = arg1; | |
153 | ||
154 | if (scn->scn_phys.scn_state == DSS_SCANNING) | |
155 | return (EBUSY); | |
156 | ||
157 | return (0); | |
158 | } | |
159 | ||
160 | /* ARGSUSED */ | |
161 | static void | |
162 | dsl_scan_setup_sync(void *arg1, void *arg2, dmu_tx_t *tx) | |
163 | { | |
164 | dsl_scan_t *scn = arg1; | |
165 | pool_scan_func_t *funcp = arg2; | |
166 | dmu_object_type_t ot = 0; | |
167 | dsl_pool_t *dp = scn->scn_dp; | |
168 | spa_t *spa = dp->dp_spa; | |
169 | ||
170 | ASSERT(scn->scn_phys.scn_state != DSS_SCANNING); | |
171 | ASSERT(*funcp > POOL_SCAN_NONE && *funcp < POOL_SCAN_FUNCS); | |
172 | bzero(&scn->scn_phys, sizeof (scn->scn_phys)); | |
173 | scn->scn_phys.scn_func = *funcp; | |
174 | scn->scn_phys.scn_state = DSS_SCANNING; | |
175 | scn->scn_phys.scn_min_txg = 0; | |
176 | scn->scn_phys.scn_max_txg = tx->tx_txg; | |
177 | scn->scn_phys.scn_ddt_class_max = DDT_CLASSES - 1; /* the entire DDT */ | |
178 | scn->scn_phys.scn_start_time = gethrestime_sec(); | |
179 | scn->scn_phys.scn_errors = 0; | |
180 | scn->scn_phys.scn_to_examine = spa->spa_root_vdev->vdev_stat.vs_alloc; | |
181 | scn->scn_restart_txg = 0; | |
182 | spa_scan_stat_init(spa); | |
183 | ||
184 | if (DSL_SCAN_IS_SCRUB_RESILVER(scn)) { | |
185 | scn->scn_phys.scn_ddt_class_max = zfs_scrub_ddt_class_max; | |
186 | ||
187 | /* rewrite all disk labels */ | |
188 | vdev_config_dirty(spa->spa_root_vdev); | |
189 | ||
190 | if (vdev_resilver_needed(spa->spa_root_vdev, | |
191 | &scn->scn_phys.scn_min_txg, &scn->scn_phys.scn_max_txg)) { | |
192 | spa_event_notify(spa, NULL, ESC_ZFS_RESILVER_START); | |
193 | } else { | |
194 | spa_event_notify(spa, NULL, ESC_ZFS_SCRUB_START); | |
195 | } | |
196 | ||
197 | spa->spa_scrub_started = B_TRUE; | |
198 | /* | |
199 | * If this is an incremental scrub, limit the DDT scrub phase | |
200 | * to just the auto-ditto class (for correctness); the rest | |
201 | * of the scrub should go faster using top-down pruning. | |
202 | */ | |
203 | if (scn->scn_phys.scn_min_txg > TXG_INITIAL) | |
204 | scn->scn_phys.scn_ddt_class_max = DDT_CLASS_DITTO; | |
205 | ||
206 | } | |
207 | ||
208 | /* back to the generic stuff */ | |
209 | ||
210 | if (dp->dp_blkstats == NULL) { | |
211 | dp->dp_blkstats = | |
212 | kmem_alloc(sizeof (zfs_all_blkstats_t), KM_SLEEP); | |
213 | } | |
214 | bzero(dp->dp_blkstats, sizeof (zfs_all_blkstats_t)); | |
215 | ||
216 | if (spa_version(spa) < SPA_VERSION_DSL_SCRUB) | |
217 | ot = DMU_OT_ZAP_OTHER; | |
218 | ||
219 | scn->scn_phys.scn_queue_obj = zap_create(dp->dp_meta_objset, | |
220 | ot ? ot : DMU_OT_SCAN_QUEUE, DMU_OT_NONE, 0, tx); | |
221 | ||
222 | dsl_scan_sync_state(scn, tx); | |
223 | ||
224 | spa_history_log_internal(LOG_POOL_SCAN, spa, tx, | |
225 | "func=%u mintxg=%llu maxtxg=%llu", | |
226 | *funcp, scn->scn_phys.scn_min_txg, scn->scn_phys.scn_max_txg); | |
227 | } | |
228 | ||
229 | /* ARGSUSED */ | |
230 | static void | |
231 | dsl_scan_done(dsl_scan_t *scn, boolean_t complete, dmu_tx_t *tx) | |
232 | { | |
233 | static const char *old_names[] = { | |
234 | "scrub_bookmark", | |
235 | "scrub_ddt_bookmark", | |
236 | "scrub_ddt_class_max", | |
237 | "scrub_queue", | |
238 | "scrub_min_txg", | |
239 | "scrub_max_txg", | |
240 | "scrub_func", | |
241 | "scrub_errors", | |
242 | NULL | |
243 | }; | |
244 | ||
245 | dsl_pool_t *dp = scn->scn_dp; | |
246 | spa_t *spa = dp->dp_spa; | |
247 | int i; | |
248 | ||
249 | /* Remove any remnants of an old-style scrub. */ | |
250 | for (i = 0; old_names[i]; i++) { | |
251 | (void) zap_remove(dp->dp_meta_objset, | |
252 | DMU_POOL_DIRECTORY_OBJECT, old_names[i], tx); | |
253 | } | |
254 | ||
255 | if (scn->scn_phys.scn_queue_obj != 0) { | |
256 | VERIFY(0 == dmu_object_free(dp->dp_meta_objset, | |
257 | scn->scn_phys.scn_queue_obj, tx)); | |
258 | scn->scn_phys.scn_queue_obj = 0; | |
259 | } | |
260 | ||
261 | /* | |
262 | * If we were "restarted" from a stopped state, don't bother | |
263 | * with anything else. | |
264 | */ | |
265 | if (scn->scn_phys.scn_state != DSS_SCANNING) | |
266 | return; | |
267 | ||
268 | if (complete) | |
269 | scn->scn_phys.scn_state = DSS_FINISHED; | |
270 | else | |
271 | scn->scn_phys.scn_state = DSS_CANCELED; | |
272 | ||
273 | spa_history_log_internal(LOG_POOL_SCAN_DONE, spa, tx, | |
274 | "complete=%u", complete); | |
275 | ||
276 | if (DSL_SCAN_IS_SCRUB_RESILVER(scn)) { | |
277 | mutex_enter(&spa->spa_scrub_lock); | |
278 | while (spa->spa_scrub_inflight > 0) { | |
279 | cv_wait(&spa->spa_scrub_io_cv, | |
280 | &spa->spa_scrub_lock); | |
281 | } | |
282 | mutex_exit(&spa->spa_scrub_lock); | |
283 | spa->spa_scrub_started = B_FALSE; | |
284 | spa->spa_scrub_active = B_FALSE; | |
285 | ||
286 | /* | |
287 | * If the scrub/resilver completed, update all DTLs to | |
288 | * reflect this. Whether it succeeded or not, vacate | |
289 | * all temporary scrub DTLs. | |
290 | */ | |
291 | vdev_dtl_reassess(spa->spa_root_vdev, tx->tx_txg, | |
292 | complete ? scn->scn_phys.scn_max_txg : 0, B_TRUE); | |
293 | if (complete) { | |
294 | spa_event_notify(spa, NULL, scn->scn_phys.scn_min_txg ? | |
295 | ESC_ZFS_RESILVER_FINISH : ESC_ZFS_SCRUB_FINISH); | |
296 | } | |
297 | spa_errlog_rotate(spa); | |
298 | ||
299 | /* | |
300 | * We may have finished replacing a device. | |
301 | * Let the async thread assess this and handle the detach. | |
302 | */ | |
303 | spa_async_request(spa, SPA_ASYNC_RESILVER_DONE); | |
304 | } | |
305 | ||
306 | scn->scn_phys.scn_end_time = gethrestime_sec(); | |
307 | } | |
308 | ||
309 | /* ARGSUSED */ | |
310 | static int | |
311 | dsl_scan_cancel_check(void *arg1, void *arg2, dmu_tx_t *tx) | |
312 | { | |
313 | dsl_scan_t *scn = arg1; | |
314 | ||
315 | if (scn->scn_phys.scn_state != DSS_SCANNING) | |
316 | return (ENOENT); | |
317 | return (0); | |
318 | } | |
319 | ||
320 | /* ARGSUSED */ | |
321 | static void | |
322 | dsl_scan_cancel_sync(void *arg1, void *arg2, dmu_tx_t *tx) | |
323 | { | |
324 | dsl_scan_t *scn = arg1; | |
325 | ||
326 | dsl_scan_done(scn, B_FALSE, tx); | |
327 | dsl_scan_sync_state(scn, tx); | |
328 | } | |
329 | ||
330 | int | |
331 | dsl_scan_cancel(dsl_pool_t *dp) | |
332 | { | |
333 | boolean_t complete = B_FALSE; | |
334 | int err; | |
335 | ||
336 | err = dsl_sync_task_do(dp, dsl_scan_cancel_check, | |
337 | dsl_scan_cancel_sync, dp->dp_scan, &complete, 3); | |
338 | return (err); | |
339 | } | |
340 | ||
341 | static void dsl_scan_visitbp(blkptr_t *bp, | |
342 | const zbookmark_t *zb, dnode_phys_t *dnp, arc_buf_t *pbuf, | |
343 | dsl_dataset_t *ds, dsl_scan_t *scn, dmu_objset_type_t ostype, | |
344 | dmu_tx_t *tx); | |
345 | static void dsl_scan_visitdnode(dsl_scan_t *, dsl_dataset_t *ds, | |
346 | dmu_objset_type_t ostype, | |
347 | dnode_phys_t *dnp, arc_buf_t *buf, uint64_t object, dmu_tx_t *tx); | |
348 | ||
349 | void | |
350 | dsl_free(dsl_pool_t *dp, uint64_t txg, const blkptr_t *bp) | |
351 | { | |
352 | zio_free(dp->dp_spa, txg, bp); | |
353 | } | |
354 | ||
355 | void | |
356 | dsl_free_sync(zio_t *pio, dsl_pool_t *dp, uint64_t txg, const blkptr_t *bpp) | |
357 | { | |
358 | ASSERT(dsl_pool_sync_context(dp)); | |
359 | zio_nowait(zio_free_sync(pio, dp->dp_spa, txg, bpp, pio->io_flags)); | |
360 | } | |
361 | ||
362 | int | |
363 | dsl_read(zio_t *pio, spa_t *spa, const blkptr_t *bpp, arc_buf_t *pbuf, | |
364 | arc_done_func_t *done, void *private, int priority, int zio_flags, | |
365 | uint32_t *arc_flags, const zbookmark_t *zb) | |
366 | { | |
367 | return (arc_read(pio, spa, bpp, pbuf, done, private, | |
368 | priority, zio_flags, arc_flags, zb)); | |
369 | } | |
370 | ||
371 | int | |
372 | dsl_read_nolock(zio_t *pio, spa_t *spa, const blkptr_t *bpp, | |
373 | arc_done_func_t *done, void *private, int priority, int zio_flags, | |
374 | uint32_t *arc_flags, const zbookmark_t *zb) | |
375 | { | |
376 | return (arc_read_nolock(pio, spa, bpp, done, private, | |
377 | priority, zio_flags, arc_flags, zb)); | |
378 | } | |
379 | ||
380 | static boolean_t | |
381 | bookmark_is_zero(const zbookmark_t *zb) | |
382 | { | |
383 | return (zb->zb_objset == 0 && zb->zb_object == 0 && | |
384 | zb->zb_level == 0 && zb->zb_blkid == 0); | |
385 | } | |
386 | ||
387 | /* dnp is the dnode for zb1->zb_object */ | |
388 | static boolean_t | |
389 | bookmark_is_before(const dnode_phys_t *dnp, const zbookmark_t *zb1, | |
390 | const zbookmark_t *zb2) | |
391 | { | |
392 | uint64_t zb1nextL0, zb2thisobj; | |
393 | ||
394 | ASSERT(zb1->zb_objset == zb2->zb_objset); | |
395 | ASSERT(zb2->zb_level == 0); | |
396 | ||
397 | /* | |
398 | * A bookmark in the deadlist is considered to be after | |
399 | * everything else. | |
400 | */ | |
401 | if (zb2->zb_object == DMU_DEADLIST_OBJECT) | |
402 | return (B_TRUE); | |
403 | ||
404 | /* The objset_phys_t isn't before anything. */ | |
405 | if (dnp == NULL) | |
406 | return (B_FALSE); | |
407 | ||
408 | zb1nextL0 = (zb1->zb_blkid + 1) << | |
409 | ((zb1->zb_level) * (dnp->dn_indblkshift - SPA_BLKPTRSHIFT)); | |
410 | ||
411 | zb2thisobj = zb2->zb_object ? zb2->zb_object : | |
412 | zb2->zb_blkid << (DNODE_BLOCK_SHIFT - DNODE_SHIFT); | |
413 | ||
414 | if (zb1->zb_object == DMU_META_DNODE_OBJECT) { | |
415 | uint64_t nextobj = zb1nextL0 * | |
416 | (dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT) >> DNODE_SHIFT; | |
417 | return (nextobj <= zb2thisobj); | |
418 | } | |
419 | ||
420 | if (zb1->zb_object < zb2thisobj) | |
421 | return (B_TRUE); | |
422 | if (zb1->zb_object > zb2thisobj) | |
423 | return (B_FALSE); | |
424 | if (zb2->zb_object == DMU_META_DNODE_OBJECT) | |
425 | return (B_FALSE); | |
426 | return (zb1nextL0 <= zb2->zb_blkid); | |
427 | } | |
428 | ||
429 | static uint64_t | |
430 | dsl_scan_ds_maxtxg(dsl_dataset_t *ds) | |
431 | { | |
432 | uint64_t smt = ds->ds_dir->dd_pool->dp_scan->scn_phys.scn_max_txg; | |
433 | if (dsl_dataset_is_snapshot(ds)) | |
434 | return (MIN(smt, ds->ds_phys->ds_creation_txg)); | |
435 | return (smt); | |
436 | } | |
437 | ||
438 | static void | |
439 | dsl_scan_sync_state(dsl_scan_t *scn, dmu_tx_t *tx) | |
440 | { | |
441 | VERIFY(0 == zap_update(scn->scn_dp->dp_meta_objset, | |
442 | DMU_POOL_DIRECTORY_OBJECT, | |
443 | DMU_POOL_SCAN, sizeof (uint64_t), SCAN_PHYS_NUMINTS, | |
444 | &scn->scn_phys, tx)); | |
445 | } | |
446 | ||
447 | static boolean_t | |
448 | dsl_scan_check_pause(dsl_scan_t *scn, const zbookmark_t *zb) | |
449 | { | |
450 | uint64_t elapsed_nanosecs; | |
451 | int mintime; | |
452 | ||
453 | /* we never skip user/group accounting objects */ | |
454 | if (zb && (int64_t)zb->zb_object < 0) | |
455 | return (B_FALSE); | |
456 | ||
457 | if (scn->scn_pausing) | |
458 | return (B_TRUE); /* we're already pausing */ | |
459 | ||
460 | if (!bookmark_is_zero(&scn->scn_phys.scn_bookmark)) | |
461 | return (B_FALSE); /* we're resuming */ | |
462 | ||
463 | /* We only know how to resume from level-0 blocks. */ | |
464 | if (zb && zb->zb_level != 0) | |
465 | return (B_FALSE); | |
466 | ||
467 | mintime = (scn->scn_phys.scn_func == POOL_SCAN_RESILVER) ? | |
468 | zfs_resilver_min_time_ms : zfs_scan_min_time_ms; | |
469 | elapsed_nanosecs = gethrtime() - scn->scn_sync_start_time; | |
470 | if (elapsed_nanosecs / NANOSEC > zfs_txg_timeout || | |
471 | (elapsed_nanosecs / MICROSEC > mintime && | |
472 | txg_sync_waiting(scn->scn_dp)) || | |
473 | spa_shutting_down(scn->scn_dp->dp_spa)) { | |
474 | if (zb) { | |
475 | dprintf("pausing at bookmark %llx/%llx/%llx/%llx\n", | |
476 | (longlong_t)zb->zb_objset, | |
477 | (longlong_t)zb->zb_object, | |
478 | (longlong_t)zb->zb_level, | |
479 | (longlong_t)zb->zb_blkid); | |
480 | scn->scn_phys.scn_bookmark = *zb; | |
481 | } | |
482 | dprintf("pausing at DDT bookmark %llx/%llx/%llx/%llx\n", | |
483 | (longlong_t)scn->scn_phys.scn_ddt_bookmark.ddb_class, | |
484 | (longlong_t)scn->scn_phys.scn_ddt_bookmark.ddb_type, | |
485 | (longlong_t)scn->scn_phys.scn_ddt_bookmark.ddb_checksum, | |
486 | (longlong_t)scn->scn_phys.scn_ddt_bookmark.ddb_cursor); | |
487 | scn->scn_pausing = B_TRUE; | |
488 | return (B_TRUE); | |
489 | } | |
490 | return (B_FALSE); | |
491 | } | |
492 | ||
493 | typedef struct zil_scan_arg { | |
494 | dsl_pool_t *zsa_dp; | |
495 | zil_header_t *zsa_zh; | |
496 | } zil_scan_arg_t; | |
497 | ||
498 | /* ARGSUSED */ | |
499 | static int | |
500 | dsl_scan_zil_block(zilog_t *zilog, blkptr_t *bp, void *arg, uint64_t claim_txg) | |
501 | { | |
502 | zil_scan_arg_t *zsa = arg; | |
503 | dsl_pool_t *dp = zsa->zsa_dp; | |
504 | dsl_scan_t *scn = dp->dp_scan; | |
505 | zil_header_t *zh = zsa->zsa_zh; | |
506 | zbookmark_t zb; | |
507 | ||
508 | if (bp->blk_birth <= scn->scn_phys.scn_cur_min_txg) | |
509 | return (0); | |
510 | ||
511 | /* | |
512 | * One block ("stubby") can be allocated a long time ago; we | |
513 | * want to visit that one because it has been allocated | |
514 | * (on-disk) even if it hasn't been claimed (even though for | |
515 | * scrub there's nothing to do to it). | |
516 | */ | |
517 | if (claim_txg == 0 && bp->blk_birth >= spa_first_txg(dp->dp_spa)) | |
518 | return (0); | |
519 | ||
520 | SET_BOOKMARK(&zb, zh->zh_log.blk_cksum.zc_word[ZIL_ZC_OBJSET], | |
521 | ZB_ZIL_OBJECT, ZB_ZIL_LEVEL, bp->blk_cksum.zc_word[ZIL_ZC_SEQ]); | |
522 | ||
523 | VERIFY(0 == scan_funcs[scn->scn_phys.scn_func](dp, bp, &zb)); | |
524 | return (0); | |
525 | } | |
526 | ||
527 | /* ARGSUSED */ | |
528 | static int | |
529 | dsl_scan_zil_record(zilog_t *zilog, lr_t *lrc, void *arg, uint64_t claim_txg) | |
530 | { | |
531 | if (lrc->lrc_txtype == TX_WRITE) { | |
532 | zil_scan_arg_t *zsa = arg; | |
533 | dsl_pool_t *dp = zsa->zsa_dp; | |
534 | dsl_scan_t *scn = dp->dp_scan; | |
535 | zil_header_t *zh = zsa->zsa_zh; | |
536 | lr_write_t *lr = (lr_write_t *)lrc; | |
537 | blkptr_t *bp = &lr->lr_blkptr; | |
538 | zbookmark_t zb; | |
539 | ||
540 | if (bp->blk_birth <= scn->scn_phys.scn_cur_min_txg) | |
541 | return (0); | |
542 | ||
543 | /* | |
544 | * birth can be < claim_txg if this record's txg is | |
545 | * already txg sync'ed (but this log block contains | |
546 | * other records that are not synced) | |
547 | */ | |
548 | if (claim_txg == 0 || bp->blk_birth < claim_txg) | |
549 | return (0); | |
550 | ||
551 | SET_BOOKMARK(&zb, zh->zh_log.blk_cksum.zc_word[ZIL_ZC_OBJSET], | |
552 | lr->lr_foid, ZB_ZIL_LEVEL, | |
553 | lr->lr_offset / BP_GET_LSIZE(bp)); | |
554 | ||
555 | VERIFY(0 == scan_funcs[scn->scn_phys.scn_func](dp, bp, &zb)); | |
556 | } | |
557 | return (0); | |
558 | } | |
559 | ||
560 | static void | |
561 | dsl_scan_zil(dsl_pool_t *dp, zil_header_t *zh) | |
562 | { | |
563 | uint64_t claim_txg = zh->zh_claim_txg; | |
564 | zil_scan_arg_t zsa = { dp, zh }; | |
565 | zilog_t *zilog; | |
566 | ||
567 | /* | |
568 | * We only want to visit blocks that have been claimed but not yet | |
569 | * replayed (or, in read-only mode, blocks that *would* be claimed). | |
570 | */ | |
571 | if (claim_txg == 0 && spa_writeable(dp->dp_spa)) | |
572 | return; | |
573 | ||
574 | zilog = zil_alloc(dp->dp_meta_objset, zh); | |
575 | ||
576 | (void) zil_parse(zilog, dsl_scan_zil_block, dsl_scan_zil_record, &zsa, | |
577 | claim_txg); | |
578 | ||
579 | zil_free(zilog); | |
580 | } | |
581 | ||
582 | /* ARGSUSED */ | |
583 | static void | |
584 | dsl_scan_prefetch(dsl_scan_t *scn, arc_buf_t *buf, blkptr_t *bp, | |
585 | uint64_t objset, uint64_t object, uint64_t blkid) | |
586 | { | |
587 | zbookmark_t czb; | |
588 | uint32_t flags = ARC_NOWAIT | ARC_PREFETCH; | |
589 | ||
590 | if (zfs_no_scrub_prefetch) | |
591 | return; | |
592 | ||
593 | if (BP_IS_HOLE(bp) || bp->blk_birth <= scn->scn_phys.scn_min_txg || | |
594 | (BP_GET_LEVEL(bp) == 0 && BP_GET_TYPE(bp) != DMU_OT_DNODE)) | |
595 | return; | |
596 | ||
597 | SET_BOOKMARK(&czb, objset, object, BP_GET_LEVEL(bp), blkid); | |
598 | ||
599 | /* | |
600 | * XXX need to make sure all of these arc_read() prefetches are | |
601 | * done before setting xlateall (similar to dsl_read()) | |
602 | */ | |
603 | (void) arc_read(scn->scn_zio_root, scn->scn_dp->dp_spa, bp, | |
604 | buf, NULL, NULL, ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL, | |
605 | &flags, &czb); | |
606 | } | |
607 | ||
608 | static boolean_t | |
609 | dsl_scan_check_resume(dsl_scan_t *scn, const dnode_phys_t *dnp, | |
610 | const zbookmark_t *zb) | |
611 | { | |
612 | /* | |
613 | * We never skip over user/group accounting objects (obj<0) | |
614 | */ | |
615 | if (!bookmark_is_zero(&scn->scn_phys.scn_bookmark) && | |
616 | (int64_t)zb->zb_object >= 0) { | |
617 | /* | |
618 | * If we already visited this bp & everything below (in | |
619 | * a prior txg sync), don't bother doing it again. | |
620 | */ | |
621 | if (bookmark_is_before(dnp, zb, &scn->scn_phys.scn_bookmark)) | |
622 | return (B_TRUE); | |
623 | ||
624 | /* | |
625 | * If we found the block we're trying to resume from, or | |
626 | * we went past it to a different object, zero it out to | |
627 | * indicate that it's OK to start checking for pausing | |
628 | * again. | |
629 | */ | |
630 | if (bcmp(zb, &scn->scn_phys.scn_bookmark, sizeof (*zb)) == 0 || | |
631 | zb->zb_object > scn->scn_phys.scn_bookmark.zb_object) { | |
632 | dprintf("resuming at %llx/%llx/%llx/%llx\n", | |
633 | (longlong_t)zb->zb_objset, | |
634 | (longlong_t)zb->zb_object, | |
635 | (longlong_t)zb->zb_level, | |
636 | (longlong_t)zb->zb_blkid); | |
637 | bzero(&scn->scn_phys.scn_bookmark, sizeof (*zb)); | |
638 | } | |
639 | } | |
640 | return (B_FALSE); | |
641 | } | |
642 | ||
643 | /* | |
644 | * Return nonzero on i/o error. | |
645 | * Return new buf to write out in *bufp. | |
646 | */ | |
647 | static int | |
648 | dsl_scan_recurse(dsl_scan_t *scn, dsl_dataset_t *ds, dmu_objset_type_t ostype, | |
649 | dnode_phys_t *dnp, const blkptr_t *bp, | |
650 | const zbookmark_t *zb, dmu_tx_t *tx, arc_buf_t **bufp) | |
651 | { | |
652 | dsl_pool_t *dp = scn->scn_dp; | |
653 | int err; | |
654 | ||
655 | if (BP_GET_LEVEL(bp) > 0) { | |
656 | uint32_t flags = ARC_WAIT; | |
657 | int i; | |
658 | blkptr_t *cbp; | |
659 | int epb = BP_GET_LSIZE(bp) >> SPA_BLKPTRSHIFT; | |
660 | ||
661 | err = arc_read_nolock(NULL, dp->dp_spa, bp, | |
662 | arc_getbuf_func, bufp, | |
663 | ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL, &flags, zb); | |
664 | if (err) { | |
665 | scn->scn_phys.scn_errors++; | |
666 | return (err); | |
667 | } | |
668 | for (i = 0, cbp = (*bufp)->b_data; i < epb; i++, cbp++) { | |
669 | dsl_scan_prefetch(scn, *bufp, cbp, zb->zb_objset, | |
670 | zb->zb_object, zb->zb_blkid * epb + i); | |
671 | } | |
672 | for (i = 0, cbp = (*bufp)->b_data; i < epb; i++, cbp++) { | |
673 | zbookmark_t czb; | |
674 | ||
675 | SET_BOOKMARK(&czb, zb->zb_objset, zb->zb_object, | |
676 | zb->zb_level - 1, | |
677 | zb->zb_blkid * epb + i); | |
678 | dsl_scan_visitbp(cbp, &czb, dnp, | |
679 | *bufp, ds, scn, ostype, tx); | |
680 | } | |
681 | } else if (BP_GET_TYPE(bp) == DMU_OT_USERGROUP_USED) { | |
682 | uint32_t flags = ARC_WAIT; | |
683 | ||
684 | err = arc_read_nolock(NULL, dp->dp_spa, bp, | |
685 | arc_getbuf_func, bufp, | |
686 | ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL, &flags, zb); | |
687 | if (err) { | |
688 | scn->scn_phys.scn_errors++; | |
689 | return (err); | |
690 | } | |
691 | } else if (BP_GET_TYPE(bp) == DMU_OT_DNODE) { | |
692 | uint32_t flags = ARC_WAIT; | |
693 | dnode_phys_t *cdnp; | |
694 | int i, j; | |
695 | int epb = BP_GET_LSIZE(bp) >> DNODE_SHIFT; | |
696 | ||
697 | err = arc_read_nolock(NULL, dp->dp_spa, bp, | |
698 | arc_getbuf_func, bufp, | |
699 | ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL, &flags, zb); | |
700 | if (err) { | |
701 | scn->scn_phys.scn_errors++; | |
702 | return (err); | |
703 | } | |
704 | for (i = 0, cdnp = (*bufp)->b_data; i < epb; i++, cdnp++) { | |
705 | for (j = 0; j < cdnp->dn_nblkptr; j++) { | |
706 | blkptr_t *cbp = &cdnp->dn_blkptr[j]; | |
707 | dsl_scan_prefetch(scn, *bufp, cbp, | |
708 | zb->zb_objset, zb->zb_blkid * epb + i, j); | |
709 | } | |
710 | } | |
711 | for (i = 0, cdnp = (*bufp)->b_data; i < epb; i++, cdnp++) { | |
712 | dsl_scan_visitdnode(scn, ds, ostype, | |
713 | cdnp, *bufp, zb->zb_blkid * epb + i, tx); | |
714 | } | |
715 | ||
716 | } else if (BP_GET_TYPE(bp) == DMU_OT_OBJSET) { | |
717 | uint32_t flags = ARC_WAIT; | |
718 | objset_phys_t *osp; | |
719 | ||
720 | err = arc_read_nolock(NULL, dp->dp_spa, bp, | |
721 | arc_getbuf_func, bufp, | |
722 | ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL, &flags, zb); | |
723 | if (err) { | |
724 | scn->scn_phys.scn_errors++; | |
725 | return (err); | |
726 | } | |
727 | ||
728 | osp = (*bufp)->b_data; | |
729 | ||
730 | if (DSL_SCAN_IS_SCRUB_RESILVER(scn)) | |
731 | dsl_scan_zil(dp, &osp->os_zil_header); | |
732 | ||
733 | dsl_scan_visitdnode(scn, ds, osp->os_type, | |
734 | &osp->os_meta_dnode, *bufp, DMU_META_DNODE_OBJECT, tx); | |
735 | ||
736 | if (OBJSET_BUF_HAS_USERUSED(*bufp)) { | |
737 | /* | |
738 | * We also always visit user/group accounting | |
739 | * objects, and never skip them, even if we are | |
740 | * pausing. This is necessary so that the space | |
741 | * deltas from this txg get integrated. | |
742 | */ | |
743 | dsl_scan_visitdnode(scn, ds, osp->os_type, | |
744 | &osp->os_groupused_dnode, *bufp, | |
745 | DMU_GROUPUSED_OBJECT, tx); | |
746 | dsl_scan_visitdnode(scn, ds, osp->os_type, | |
747 | &osp->os_userused_dnode, *bufp, | |
748 | DMU_USERUSED_OBJECT, tx); | |
749 | } | |
750 | } | |
751 | ||
752 | return (0); | |
753 | } | |
754 | ||
755 | static void | |
756 | dsl_scan_visitdnode(dsl_scan_t *scn, dsl_dataset_t *ds, | |
757 | dmu_objset_type_t ostype, dnode_phys_t *dnp, arc_buf_t *buf, | |
758 | uint64_t object, dmu_tx_t *tx) | |
759 | { | |
760 | int j; | |
761 | ||
762 | for (j = 0; j < dnp->dn_nblkptr; j++) { | |
763 | zbookmark_t czb; | |
764 | ||
765 | SET_BOOKMARK(&czb, ds ? ds->ds_object : 0, object, | |
766 | dnp->dn_nlevels - 1, j); | |
767 | dsl_scan_visitbp(&dnp->dn_blkptr[j], | |
768 | &czb, dnp, buf, ds, scn, ostype, tx); | |
769 | } | |
770 | ||
771 | if (dnp->dn_flags & DNODE_FLAG_SPILL_BLKPTR) { | |
772 | zbookmark_t czb; | |
773 | SET_BOOKMARK(&czb, ds ? ds->ds_object : 0, object, | |
774 | 0, DMU_SPILL_BLKID); | |
775 | dsl_scan_visitbp(&dnp->dn_spill, | |
776 | &czb, dnp, buf, ds, scn, ostype, tx); | |
777 | } | |
778 | } | |
779 | ||
780 | /* | |
781 | * The arguments are in this order because mdb can only print the | |
782 | * first 5; we want them to be useful. | |
783 | */ | |
784 | static void | |
785 | dsl_scan_visitbp(blkptr_t *bp, const zbookmark_t *zb, | |
786 | dnode_phys_t *dnp, arc_buf_t *pbuf, | |
787 | dsl_dataset_t *ds, dsl_scan_t *scn, dmu_objset_type_t ostype, | |
788 | dmu_tx_t *tx) | |
789 | { | |
790 | dsl_pool_t *dp = scn->scn_dp; | |
791 | arc_buf_t *buf = NULL; | |
792 | blkptr_t bp_toread = *bp; | |
793 | ||
794 | /* ASSERT(pbuf == NULL || arc_released(pbuf)); */ | |
795 | ||
796 | if (dsl_scan_check_pause(scn, zb)) | |
797 | return; | |
798 | ||
799 | if (dsl_scan_check_resume(scn, dnp, zb)) | |
800 | return; | |
801 | ||
802 | if (bp->blk_birth == 0) | |
803 | return; | |
804 | ||
805 | scn->scn_visited_this_txg++; | |
806 | ||
807 | dprintf_bp(bp, | |
808 | "visiting ds=%p/%llu zb=%llx/%llx/%llx/%llx buf=%p bp=%p", | |
809 | ds, ds ? ds->ds_object : 0, | |
810 | zb->zb_objset, zb->zb_object, zb->zb_level, zb->zb_blkid, | |
811 | pbuf, bp); | |
812 | ||
813 | if (bp->blk_birth <= scn->scn_phys.scn_cur_min_txg) | |
814 | return; | |
815 | ||
816 | if (BP_GET_TYPE(bp) != DMU_OT_USERGROUP_USED) { | |
817 | /* | |
818 | * For non-user-accounting blocks, we need to read the | |
819 | * new bp (from a deleted snapshot, found in | |
820 | * check_existing_xlation). If we used the old bp, | |
821 | * pointers inside this block from before we resumed | |
822 | * would be untranslated. | |
823 | * | |
824 | * For user-accounting blocks, we need to read the old | |
825 | * bp, because we will apply the entire space delta to | |
826 | * it (original untranslated -> translations from | |
827 | * deleted snap -> now). | |
828 | */ | |
829 | bp_toread = *bp; | |
830 | } | |
831 | ||
832 | if (dsl_scan_recurse(scn, ds, ostype, dnp, &bp_toread, zb, tx, | |
833 | &buf) != 0) | |
834 | return; | |
835 | ||
836 | /* | |
837 | * If dsl_scan_ddt() has aready visited this block, it will have | |
838 | * already done any translations or scrubbing, so don't call the | |
839 | * callback again. | |
840 | */ | |
841 | if (ddt_class_contains(dp->dp_spa, | |
842 | scn->scn_phys.scn_ddt_class_max, bp)) { | |
843 | ASSERT(buf == NULL); | |
844 | return; | |
845 | } | |
846 | ||
847 | /* | |
848 | * If this block is from the future (after cur_max_txg), then we | |
849 | * are doing this on behalf of a deleted snapshot, and we will | |
850 | * revisit the future block on the next pass of this dataset. | |
851 | * Don't scan it now unless we need to because something | |
852 | * under it was modified. | |
853 | */ | |
854 | if (bp->blk_birth <= scn->scn_phys.scn_cur_max_txg) { | |
855 | scan_funcs[scn->scn_phys.scn_func](dp, bp, zb); | |
856 | } | |
857 | if (buf) | |
858 | (void) arc_buf_remove_ref(buf, &buf); | |
859 | } | |
860 | ||
861 | static void | |
862 | dsl_scan_visit_rootbp(dsl_scan_t *scn, dsl_dataset_t *ds, blkptr_t *bp, | |
863 | dmu_tx_t *tx) | |
864 | { | |
865 | zbookmark_t zb; | |
866 | ||
867 | SET_BOOKMARK(&zb, ds ? ds->ds_object : DMU_META_OBJSET, | |
868 | ZB_ROOT_OBJECT, ZB_ROOT_LEVEL, ZB_ROOT_BLKID); | |
869 | dsl_scan_visitbp(bp, &zb, NULL, NULL, | |
870 | ds, scn, DMU_OST_NONE, tx); | |
871 | ||
872 | dprintf_ds(ds, "finished scan%s", ""); | |
873 | } | |
874 | ||
875 | void | |
876 | dsl_scan_ds_destroyed(dsl_dataset_t *ds, dmu_tx_t *tx) | |
877 | { | |
878 | dsl_pool_t *dp = ds->ds_dir->dd_pool; | |
879 | dsl_scan_t *scn = dp->dp_scan; | |
880 | uint64_t mintxg; | |
881 | ||
882 | if (scn->scn_phys.scn_state != DSS_SCANNING) | |
883 | return; | |
884 | ||
885 | if (scn->scn_phys.scn_bookmark.zb_objset == ds->ds_object) { | |
886 | if (dsl_dataset_is_snapshot(ds)) { | |
887 | /* Note, scn_cur_{min,max}_txg stays the same. */ | |
888 | scn->scn_phys.scn_bookmark.zb_objset = | |
889 | ds->ds_phys->ds_next_snap_obj; | |
890 | zfs_dbgmsg("destroying ds %llu; currently traversing; " | |
891 | "reset zb_objset to %llu", | |
892 | (u_longlong_t)ds->ds_object, | |
893 | (u_longlong_t)ds->ds_phys->ds_next_snap_obj); | |
894 | scn->scn_phys.scn_flags |= DSF_VISIT_DS_AGAIN; | |
895 | } else { | |
896 | SET_BOOKMARK(&scn->scn_phys.scn_bookmark, | |
897 | ZB_DESTROYED_OBJSET, 0, 0, 0); | |
898 | zfs_dbgmsg("destroying ds %llu; currently traversing; " | |
899 | "reset bookmark to -1,0,0,0", | |
900 | (u_longlong_t)ds->ds_object); | |
901 | } | |
902 | } else if (zap_lookup_int_key(dp->dp_meta_objset, | |
903 | scn->scn_phys.scn_queue_obj, ds->ds_object, &mintxg) == 0) { | |
904 | ASSERT3U(ds->ds_phys->ds_num_children, <=, 1); | |
905 | VERIFY3U(0, ==, zap_remove_int(dp->dp_meta_objset, | |
906 | scn->scn_phys.scn_queue_obj, ds->ds_object, tx)); | |
907 | if (dsl_dataset_is_snapshot(ds)) { | |
908 | /* | |
909 | * We keep the same mintxg; it could be > | |
910 | * ds_creation_txg if the previous snapshot was | |
911 | * deleted too. | |
912 | */ | |
913 | VERIFY(zap_add_int_key(dp->dp_meta_objset, | |
914 | scn->scn_phys.scn_queue_obj, | |
915 | ds->ds_phys->ds_next_snap_obj, mintxg, tx) == 0); | |
916 | zfs_dbgmsg("destroying ds %llu; in queue; " | |
917 | "replacing with %llu", | |
918 | (u_longlong_t)ds->ds_object, | |
919 | (u_longlong_t)ds->ds_phys->ds_next_snap_obj); | |
920 | } else { | |
921 | zfs_dbgmsg("destroying ds %llu; in queue; removing", | |
922 | (u_longlong_t)ds->ds_object); | |
923 | } | |
924 | } else { | |
925 | zfs_dbgmsg("destroying ds %llu; ignoring", | |
926 | (u_longlong_t)ds->ds_object); | |
927 | } | |
928 | ||
929 | /* | |
930 | * dsl_scan_sync() should be called after this, and should sync | |
931 | * out our changed state, but just to be safe, do it here. | |
932 | */ | |
933 | dsl_scan_sync_state(scn, tx); | |
934 | } | |
935 | ||
936 | void | |
937 | dsl_scan_ds_snapshotted(dsl_dataset_t *ds, dmu_tx_t *tx) | |
938 | { | |
939 | dsl_pool_t *dp = ds->ds_dir->dd_pool; | |
940 | dsl_scan_t *scn = dp->dp_scan; | |
941 | uint64_t mintxg; | |
942 | ||
943 | if (scn->scn_phys.scn_state != DSS_SCANNING) | |
944 | return; | |
945 | ||
946 | ASSERT(ds->ds_phys->ds_prev_snap_obj != 0); | |
947 | ||
948 | if (scn->scn_phys.scn_bookmark.zb_objset == ds->ds_object) { | |
949 | scn->scn_phys.scn_bookmark.zb_objset = | |
950 | ds->ds_phys->ds_prev_snap_obj; | |
951 | zfs_dbgmsg("snapshotting ds %llu; currently traversing; " | |
952 | "reset zb_objset to %llu", | |
953 | (u_longlong_t)ds->ds_object, | |
954 | (u_longlong_t)ds->ds_phys->ds_prev_snap_obj); | |
955 | } else if (zap_lookup_int_key(dp->dp_meta_objset, | |
956 | scn->scn_phys.scn_queue_obj, ds->ds_object, &mintxg) == 0) { | |
957 | VERIFY3U(0, ==, zap_remove_int(dp->dp_meta_objset, | |
958 | scn->scn_phys.scn_queue_obj, ds->ds_object, tx)); | |
959 | VERIFY(zap_add_int_key(dp->dp_meta_objset, | |
960 | scn->scn_phys.scn_queue_obj, | |
961 | ds->ds_phys->ds_prev_snap_obj, mintxg, tx) == 0); | |
962 | zfs_dbgmsg("snapshotting ds %llu; in queue; " | |
963 | "replacing with %llu", | |
964 | (u_longlong_t)ds->ds_object, | |
965 | (u_longlong_t)ds->ds_phys->ds_prev_snap_obj); | |
966 | } | |
967 | dsl_scan_sync_state(scn, tx); | |
968 | } | |
969 | ||
970 | void | |
971 | dsl_scan_ds_clone_swapped(dsl_dataset_t *ds1, dsl_dataset_t *ds2, dmu_tx_t *tx) | |
972 | { | |
973 | dsl_pool_t *dp = ds1->ds_dir->dd_pool; | |
974 | dsl_scan_t *scn = dp->dp_scan; | |
975 | uint64_t mintxg; | |
976 | ||
977 | if (scn->scn_phys.scn_state != DSS_SCANNING) | |
978 | return; | |
979 | ||
980 | if (scn->scn_phys.scn_bookmark.zb_objset == ds1->ds_object) { | |
981 | scn->scn_phys.scn_bookmark.zb_objset = ds2->ds_object; | |
982 | zfs_dbgmsg("clone_swap ds %llu; currently traversing; " | |
983 | "reset zb_objset to %llu", | |
984 | (u_longlong_t)ds1->ds_object, | |
985 | (u_longlong_t)ds2->ds_object); | |
986 | } else if (scn->scn_phys.scn_bookmark.zb_objset == ds2->ds_object) { | |
987 | scn->scn_phys.scn_bookmark.zb_objset = ds1->ds_object; | |
988 | zfs_dbgmsg("clone_swap ds %llu; currently traversing; " | |
989 | "reset zb_objset to %llu", | |
990 | (u_longlong_t)ds2->ds_object, | |
991 | (u_longlong_t)ds1->ds_object); | |
992 | } | |
993 | ||
994 | if (zap_lookup_int_key(dp->dp_meta_objset, scn->scn_phys.scn_queue_obj, | |
995 | ds1->ds_object, &mintxg) == 0) { | |
996 | int err; | |
997 | ||
998 | ASSERT3U(mintxg, ==, ds1->ds_phys->ds_prev_snap_txg); | |
999 | ASSERT3U(mintxg, ==, ds2->ds_phys->ds_prev_snap_txg); | |
1000 | VERIFY3U(0, ==, zap_remove_int(dp->dp_meta_objset, | |
1001 | scn->scn_phys.scn_queue_obj, ds1->ds_object, tx)); | |
1002 | err = zap_add_int_key(dp->dp_meta_objset, | |
1003 | scn->scn_phys.scn_queue_obj, ds2->ds_object, mintxg, tx); | |
1004 | VERIFY(err == 0 || err == EEXIST); | |
1005 | if (err == EEXIST) { | |
1006 | /* Both were there to begin with */ | |
1007 | VERIFY(0 == zap_add_int_key(dp->dp_meta_objset, | |
1008 | scn->scn_phys.scn_queue_obj, | |
1009 | ds1->ds_object, mintxg, tx)); | |
1010 | } | |
1011 | zfs_dbgmsg("clone_swap ds %llu; in queue; " | |
1012 | "replacing with %llu", | |
1013 | (u_longlong_t)ds1->ds_object, | |
1014 | (u_longlong_t)ds2->ds_object); | |
1015 | } else if (zap_lookup_int_key(dp->dp_meta_objset, | |
1016 | scn->scn_phys.scn_queue_obj, ds2->ds_object, &mintxg) == 0) { | |
1017 | ASSERT3U(mintxg, ==, ds1->ds_phys->ds_prev_snap_txg); | |
1018 | ASSERT3U(mintxg, ==, ds2->ds_phys->ds_prev_snap_txg); | |
1019 | VERIFY3U(0, ==, zap_remove_int(dp->dp_meta_objset, | |
1020 | scn->scn_phys.scn_queue_obj, ds2->ds_object, tx)); | |
1021 | VERIFY(0 == zap_add_int_key(dp->dp_meta_objset, | |
1022 | scn->scn_phys.scn_queue_obj, ds1->ds_object, mintxg, tx)); | |
1023 | zfs_dbgmsg("clone_swap ds %llu; in queue; " | |
1024 | "replacing with %llu", | |
1025 | (u_longlong_t)ds2->ds_object, | |
1026 | (u_longlong_t)ds1->ds_object); | |
1027 | } | |
1028 | ||
1029 | dsl_scan_sync_state(scn, tx); | |
1030 | } | |
1031 | ||
1032 | struct enqueue_clones_arg { | |
1033 | dmu_tx_t *tx; | |
1034 | uint64_t originobj; | |
1035 | }; | |
1036 | ||
1037 | /* ARGSUSED */ | |
1038 | static int | |
1039 | enqueue_clones_cb(spa_t *spa, uint64_t dsobj, const char *dsname, void *arg) | |
1040 | { | |
1041 | struct enqueue_clones_arg *eca = arg; | |
1042 | dsl_dataset_t *ds; | |
1043 | int err; | |
1044 | dsl_pool_t *dp = spa->spa_dsl_pool; | |
1045 | dsl_scan_t *scn = dp->dp_scan; | |
1046 | ||
1047 | err = dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds); | |
1048 | if (err) | |
1049 | return (err); | |
1050 | ||
1051 | if (ds->ds_dir->dd_phys->dd_origin_obj == eca->originobj) { | |
1052 | while (ds->ds_phys->ds_prev_snap_obj != eca->originobj) { | |
1053 | dsl_dataset_t *prev; | |
1054 | err = dsl_dataset_hold_obj(dp, | |
1055 | ds->ds_phys->ds_prev_snap_obj, FTAG, &prev); | |
1056 | ||
1057 | dsl_dataset_rele(ds, FTAG); | |
1058 | if (err) | |
1059 | return (err); | |
1060 | ds = prev; | |
1061 | } | |
1062 | VERIFY(zap_add_int_key(dp->dp_meta_objset, | |
1063 | scn->scn_phys.scn_queue_obj, ds->ds_object, | |
1064 | ds->ds_phys->ds_prev_snap_txg, eca->tx) == 0); | |
1065 | } | |
1066 | dsl_dataset_rele(ds, FTAG); | |
1067 | return (0); | |
1068 | } | |
1069 | ||
1070 | static void | |
1071 | dsl_scan_visitds(dsl_scan_t *scn, uint64_t dsobj, dmu_tx_t *tx) | |
1072 | { | |
1073 | dsl_pool_t *dp = scn->scn_dp; | |
1074 | dsl_dataset_t *ds; | |
1075 | ||
1076 | VERIFY3U(0, ==, dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds)); | |
1077 | ||
1078 | /* | |
1079 | * Iterate over the bps in this ds. | |
1080 | */ | |
1081 | dmu_buf_will_dirty(ds->ds_dbuf, tx); | |
1082 | dsl_scan_visit_rootbp(scn, ds, &ds->ds_phys->ds_bp, tx); | |
1083 | ||
1084 | char *dsname = kmem_alloc(ZFS_MAXNAMELEN, KM_SLEEP); | |
1085 | dsl_dataset_name(ds, dsname); | |
1086 | zfs_dbgmsg("scanned dataset %llu (%s) with min=%llu max=%llu; " | |
1087 | "pausing=%u", | |
1088 | (longlong_t)dsobj, dsname, | |
1089 | (longlong_t)scn->scn_phys.scn_cur_min_txg, | |
1090 | (longlong_t)scn->scn_phys.scn_cur_max_txg, | |
1091 | (int)scn->scn_pausing); | |
1092 | kmem_free(dsname, ZFS_MAXNAMELEN); | |
1093 | ||
1094 | if (scn->scn_pausing) | |
1095 | goto out; | |
1096 | ||
1097 | /* | |
1098 | * We've finished this pass over this dataset. | |
1099 | */ | |
1100 | ||
1101 | /* | |
1102 | * If we did not completely visit this dataset, do another pass. | |
1103 | */ | |
1104 | if (scn->scn_phys.scn_flags & DSF_VISIT_DS_AGAIN) { | |
1105 | zfs_dbgmsg("incomplete pass; visiting again"); | |
1106 | scn->scn_phys.scn_flags &= ~DSF_VISIT_DS_AGAIN; | |
1107 | VERIFY(zap_add_int_key(dp->dp_meta_objset, | |
1108 | scn->scn_phys.scn_queue_obj, ds->ds_object, | |
1109 | scn->scn_phys.scn_cur_max_txg, tx) == 0); | |
1110 | goto out; | |
1111 | } | |
1112 | ||
1113 | /* | |
1114 | * Add descendent datasets to work queue. | |
1115 | */ | |
1116 | if (ds->ds_phys->ds_next_snap_obj != 0) { | |
1117 | VERIFY(zap_add_int_key(dp->dp_meta_objset, | |
1118 | scn->scn_phys.scn_queue_obj, ds->ds_phys->ds_next_snap_obj, | |
1119 | ds->ds_phys->ds_creation_txg, tx) == 0); | |
1120 | } | |
1121 | if (ds->ds_phys->ds_num_children > 1) { | |
1122 | boolean_t usenext = B_FALSE; | |
1123 | if (ds->ds_phys->ds_next_clones_obj != 0) { | |
1124 | uint64_t count; | |
1125 | /* | |
1126 | * A bug in a previous version of the code could | |
1127 | * cause upgrade_clones_cb() to not set | |
1128 | * ds_next_snap_obj when it should, leading to a | |
1129 | * missing entry. Therefore we can only use the | |
1130 | * next_clones_obj when its count is correct. | |
1131 | */ | |
1132 | int err = zap_count(dp->dp_meta_objset, | |
1133 | ds->ds_phys->ds_next_clones_obj, &count); | |
1134 | if (err == 0 && | |
1135 | count == ds->ds_phys->ds_num_children - 1) | |
1136 | usenext = B_TRUE; | |
1137 | } | |
1138 | ||
1139 | if (usenext) { | |
1140 | VERIFY(zap_join_key(dp->dp_meta_objset, | |
1141 | ds->ds_phys->ds_next_clones_obj, | |
1142 | scn->scn_phys.scn_queue_obj, | |
1143 | ds->ds_phys->ds_creation_txg, tx) == 0); | |
1144 | } else { | |
1145 | struct enqueue_clones_arg eca; | |
1146 | eca.tx = tx; | |
1147 | eca.originobj = ds->ds_object; | |
1148 | ||
1149 | (void) dmu_objset_find_spa(ds->ds_dir->dd_pool->dp_spa, | |
1150 | NULL, enqueue_clones_cb, &eca, DS_FIND_CHILDREN); | |
1151 | } | |
1152 | } | |
1153 | ||
1154 | out: | |
1155 | dsl_dataset_rele(ds, FTAG); | |
1156 | } | |
1157 | ||
1158 | /* ARGSUSED */ | |
1159 | static int | |
1160 | enqueue_cb(spa_t *spa, uint64_t dsobj, const char *dsname, void *arg) | |
1161 | { | |
1162 | dmu_tx_t *tx = arg; | |
1163 | dsl_dataset_t *ds; | |
1164 | int err; | |
1165 | dsl_pool_t *dp = spa->spa_dsl_pool; | |
1166 | dsl_scan_t *scn = dp->dp_scan; | |
1167 | ||
1168 | err = dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds); | |
1169 | if (err) | |
1170 | return (err); | |
1171 | ||
1172 | while (ds->ds_phys->ds_prev_snap_obj != 0) { | |
1173 | dsl_dataset_t *prev; | |
1174 | err = dsl_dataset_hold_obj(dp, ds->ds_phys->ds_prev_snap_obj, | |
1175 | FTAG, &prev); | |
1176 | if (err) { | |
1177 | dsl_dataset_rele(ds, FTAG); | |
1178 | return (err); | |
1179 | } | |
1180 | ||
1181 | /* | |
1182 | * If this is a clone, we don't need to worry about it for now. | |
1183 | */ | |
1184 | if (prev->ds_phys->ds_next_snap_obj != ds->ds_object) { | |
1185 | dsl_dataset_rele(ds, FTAG); | |
1186 | dsl_dataset_rele(prev, FTAG); | |
1187 | return (0); | |
1188 | } | |
1189 | dsl_dataset_rele(ds, FTAG); | |
1190 | ds = prev; | |
1191 | } | |
1192 | ||
1193 | VERIFY(zap_add_int_key(dp->dp_meta_objset, scn->scn_phys.scn_queue_obj, | |
1194 | ds->ds_object, ds->ds_phys->ds_prev_snap_txg, tx) == 0); | |
1195 | dsl_dataset_rele(ds, FTAG); | |
1196 | return (0); | |
1197 | } | |
1198 | ||
1199 | /* | |
1200 | * Scrub/dedup interaction. | |
1201 | * | |
1202 | * If there are N references to a deduped block, we don't want to scrub it | |
1203 | * N times -- ideally, we should scrub it exactly once. | |
1204 | * | |
1205 | * We leverage the fact that the dde's replication class (enum ddt_class) | |
1206 | * is ordered from highest replication class (DDT_CLASS_DITTO) to lowest | |
1207 | * (DDT_CLASS_UNIQUE) so that we may walk the DDT in that order. | |
1208 | * | |
1209 | * To prevent excess scrubbing, the scrub begins by walking the DDT | |
1210 | * to find all blocks with refcnt > 1, and scrubs each of these once. | |
1211 | * Since there are two replication classes which contain blocks with | |
1212 | * refcnt > 1, we scrub the highest replication class (DDT_CLASS_DITTO) first. | |
1213 | * Finally the top-down scrub begins, only visiting blocks with refcnt == 1. | |
1214 | * | |
1215 | * There would be nothing more to say if a block's refcnt couldn't change | |
1216 | * during a scrub, but of course it can so we must account for changes | |
1217 | * in a block's replication class. | |
1218 | * | |
1219 | * Here's an example of what can occur: | |
1220 | * | |
1221 | * If a block has refcnt > 1 during the DDT scrub phase, but has refcnt == 1 | |
1222 | * when visited during the top-down scrub phase, it will be scrubbed twice. | |
1223 | * This negates our scrub optimization, but is otherwise harmless. | |
1224 | * | |
1225 | * If a block has refcnt == 1 during the DDT scrub phase, but has refcnt > 1 | |
1226 | * on each visit during the top-down scrub phase, it will never be scrubbed. | |
1227 | * To catch this, ddt_sync_entry() notifies the scrub code whenever a block's | |
1228 | * reference class transitions to a higher level (i.e DDT_CLASS_UNIQUE to | |
1229 | * DDT_CLASS_DUPLICATE); if it transitions from refcnt == 1 to refcnt > 1 | |
1230 | * while a scrub is in progress, it scrubs the block right then. | |
1231 | */ | |
1232 | static void | |
1233 | dsl_scan_ddt(dsl_scan_t *scn, dmu_tx_t *tx) | |
1234 | { | |
1235 | ddt_bookmark_t *ddb = &scn->scn_phys.scn_ddt_bookmark; | |
1236 | ddt_entry_t dde = { 0 }; | |
1237 | int error; | |
1238 | uint64_t n = 0; | |
1239 | ||
1240 | while ((error = ddt_walk(scn->scn_dp->dp_spa, ddb, &dde)) == 0) { | |
1241 | ddt_t *ddt; | |
1242 | ||
1243 | if (ddb->ddb_class > scn->scn_phys.scn_ddt_class_max) | |
1244 | break; | |
1245 | dprintf("visiting ddb=%llu/%llu/%llu/%llx\n", | |
1246 | (longlong_t)ddb->ddb_class, | |
1247 | (longlong_t)ddb->ddb_type, | |
1248 | (longlong_t)ddb->ddb_checksum, | |
1249 | (longlong_t)ddb->ddb_cursor); | |
1250 | ||
1251 | /* There should be no pending changes to the dedup table */ | |
1252 | ddt = scn->scn_dp->dp_spa->spa_ddt[ddb->ddb_checksum]; | |
1253 | ASSERT(avl_first(&ddt->ddt_tree) == NULL); | |
1254 | ||
1255 | dsl_scan_ddt_entry(scn, ddb->ddb_checksum, &dde, tx); | |
1256 | n++; | |
1257 | ||
1258 | if (dsl_scan_check_pause(scn, NULL)) | |
1259 | break; | |
1260 | } | |
1261 | ||
1262 | zfs_dbgmsg("scanned %llu ddt entries with class_max = %u; pausing=%u", | |
1263 | (longlong_t)n, (int)scn->scn_phys.scn_ddt_class_max, | |
1264 | (int)scn->scn_pausing); | |
1265 | ||
1266 | ASSERT(error == 0 || error == ENOENT); | |
1267 | ASSERT(error != ENOENT || | |
1268 | ddb->ddb_class > scn->scn_phys.scn_ddt_class_max); | |
1269 | } | |
1270 | ||
1271 | /* ARGSUSED */ | |
1272 | void | |
1273 | dsl_scan_ddt_entry(dsl_scan_t *scn, enum zio_checksum checksum, | |
1274 | ddt_entry_t *dde, dmu_tx_t *tx) | |
1275 | { | |
1276 | const ddt_key_t *ddk = &dde->dde_key; | |
1277 | ddt_phys_t *ddp = dde->dde_phys; | |
1278 | blkptr_t bp; | |
1279 | zbookmark_t zb = { 0 }; | |
1280 | ||
1281 | if (scn->scn_phys.scn_state != DSS_SCANNING) | |
1282 | return; | |
1283 | ||
1284 | for (int p = 0; p < DDT_PHYS_TYPES; p++, ddp++) { | |
1285 | if (ddp->ddp_phys_birth == 0 || | |
1286 | ddp->ddp_phys_birth > scn->scn_phys.scn_cur_max_txg) | |
1287 | continue; | |
1288 | ddt_bp_create(checksum, ddk, ddp, &bp); | |
1289 | ||
1290 | scn->scn_visited_this_txg++; | |
1291 | scan_funcs[scn->scn_phys.scn_func](scn->scn_dp, &bp, &zb); | |
1292 | } | |
1293 | } | |
1294 | ||
1295 | static void | |
1296 | dsl_scan_visit(dsl_scan_t *scn, dmu_tx_t *tx) | |
1297 | { | |
1298 | dsl_pool_t *dp = scn->scn_dp; | |
1299 | zap_cursor_t zc; | |
1300 | zap_attribute_t za; | |
1301 | ||
1302 | if (scn->scn_phys.scn_ddt_bookmark.ddb_class <= | |
1303 | scn->scn_phys.scn_ddt_class_max) { | |
1304 | scn->scn_phys.scn_cur_min_txg = scn->scn_phys.scn_min_txg; | |
1305 | scn->scn_phys.scn_cur_max_txg = scn->scn_phys.scn_max_txg; | |
1306 | dsl_scan_ddt(scn, tx); | |
1307 | if (scn->scn_pausing) | |
1308 | return; | |
1309 | } | |
1310 | ||
1311 | if (scn->scn_phys.scn_bookmark.zb_objset == DMU_META_OBJSET) { | |
1312 | /* First do the MOS & ORIGIN */ | |
1313 | ||
1314 | scn->scn_phys.scn_cur_min_txg = scn->scn_phys.scn_min_txg; | |
1315 | scn->scn_phys.scn_cur_max_txg = scn->scn_phys.scn_max_txg; | |
1316 | dsl_scan_visit_rootbp(scn, NULL, | |
1317 | &dp->dp_meta_rootbp, tx); | |
1318 | spa_set_rootblkptr(dp->dp_spa, &dp->dp_meta_rootbp); | |
1319 | if (scn->scn_pausing) | |
1320 | return; | |
1321 | ||
1322 | if (spa_version(dp->dp_spa) < SPA_VERSION_DSL_SCRUB) { | |
1323 | VERIFY(0 == dmu_objset_find_spa(dp->dp_spa, | |
1324 | NULL, enqueue_cb, tx, DS_FIND_CHILDREN)); | |
1325 | } else { | |
1326 | dsl_scan_visitds(scn, | |
1327 | dp->dp_origin_snap->ds_object, tx); | |
1328 | } | |
1329 | ASSERT(!scn->scn_pausing); | |
1330 | } else if (scn->scn_phys.scn_bookmark.zb_objset != | |
1331 | ZB_DESTROYED_OBJSET) { | |
1332 | /* | |
1333 | * If we were paused, continue from here. Note if the | |
1334 | * ds we were paused on was deleted, the zb_objset may | |
1335 | * be -1, so we will skip this and find a new objset | |
1336 | * below. | |
1337 | */ | |
1338 | dsl_scan_visitds(scn, scn->scn_phys.scn_bookmark.zb_objset, tx); | |
1339 | if (scn->scn_pausing) | |
1340 | return; | |
1341 | } | |
1342 | ||
1343 | /* | |
1344 | * In case we were paused right at the end of the ds, zero the | |
1345 | * bookmark so we don't think that we're still trying to resume. | |
1346 | */ | |
1347 | bzero(&scn->scn_phys.scn_bookmark, sizeof (zbookmark_t)); | |
1348 | ||
1349 | /* keep pulling things out of the zap-object-as-queue */ | |
1350 | while (zap_cursor_init(&zc, dp->dp_meta_objset, | |
1351 | scn->scn_phys.scn_queue_obj), | |
1352 | zap_cursor_retrieve(&zc, &za) == 0) { | |
1353 | dsl_dataset_t *ds; | |
1354 | uint64_t dsobj; | |
1355 | ||
1356 | dsobj = strtonum(za.za_name, NULL); | |
1357 | VERIFY3U(0, ==, zap_remove_int(dp->dp_meta_objset, | |
1358 | scn->scn_phys.scn_queue_obj, dsobj, tx)); | |
1359 | ||
1360 | /* Set up min/max txg */ | |
1361 | VERIFY3U(0, ==, dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds)); | |
1362 | if (za.za_first_integer != 0) { | |
1363 | scn->scn_phys.scn_cur_min_txg = | |
1364 | MAX(scn->scn_phys.scn_min_txg, | |
1365 | za.za_first_integer); | |
1366 | } else { | |
1367 | scn->scn_phys.scn_cur_min_txg = | |
1368 | MAX(scn->scn_phys.scn_min_txg, | |
1369 | ds->ds_phys->ds_prev_snap_txg); | |
1370 | } | |
1371 | scn->scn_phys.scn_cur_max_txg = dsl_scan_ds_maxtxg(ds); | |
1372 | dsl_dataset_rele(ds, FTAG); | |
1373 | ||
1374 | dsl_scan_visitds(scn, dsobj, tx); | |
1375 | zap_cursor_fini(&zc); | |
1376 | if (scn->scn_pausing) | |
1377 | return; | |
1378 | } | |
1379 | zap_cursor_fini(&zc); | |
1380 | } | |
1381 | ||
1382 | static int | |
1383 | dsl_scan_free_cb(void *arg, const blkptr_t *bp, dmu_tx_t *tx) | |
1384 | { | |
1385 | dsl_scan_t *scn = arg; | |
1386 | uint64_t elapsed_nanosecs; | |
1387 | ||
1388 | elapsed_nanosecs = gethrtime() - scn->scn_sync_start_time; | |
1389 | ||
1390 | if (elapsed_nanosecs / NANOSEC > zfs_txg_timeout || | |
1391 | (elapsed_nanosecs / MICROSEC > zfs_free_min_time_ms && | |
1392 | txg_sync_waiting(scn->scn_dp)) || | |
1393 | spa_shutting_down(scn->scn_dp->dp_spa)) | |
1394 | return (ERESTART); | |
1395 | ||
1396 | zio_nowait(zio_free_sync(scn->scn_zio_root, scn->scn_dp->dp_spa, | |
1397 | dmu_tx_get_txg(tx), bp, 0)); | |
1398 | dsl_dir_diduse_space(tx->tx_pool->dp_free_dir, DD_USED_HEAD, | |
1399 | -bp_get_dsize_sync(scn->scn_dp->dp_spa, bp), | |
1400 | -BP_GET_PSIZE(bp), -BP_GET_UCSIZE(bp), tx); | |
1401 | scn->scn_visited_this_txg++; | |
1402 | return (0); | |
1403 | } | |
1404 | ||
1405 | boolean_t | |
1406 | dsl_scan_active(dsl_scan_t *scn) | |
1407 | { | |
1408 | spa_t *spa = scn->scn_dp->dp_spa; | |
1409 | uint64_t used = 0, comp, uncomp; | |
1410 | ||
1411 | if (spa->spa_load_state != SPA_LOAD_NONE) | |
1412 | return (B_FALSE); | |
1413 | if (spa_shutting_down(spa)) | |
1414 | return (B_FALSE); | |
1415 | ||
1416 | if (scn->scn_phys.scn_state == DSS_SCANNING) | |
1417 | return (B_TRUE); | |
1418 | ||
1419 | if (spa_version(scn->scn_dp->dp_spa) >= SPA_VERSION_DEADLISTS) { | |
1420 | (void) bpobj_space(&scn->scn_dp->dp_free_bpobj, | |
1421 | &used, &comp, &uncomp); | |
1422 | } | |
1423 | return (used != 0); | |
1424 | } | |
1425 | ||
1426 | void | |
1427 | dsl_scan_sync(dsl_pool_t *dp, dmu_tx_t *tx) | |
1428 | { | |
1429 | dsl_scan_t *scn = dp->dp_scan; | |
1430 | spa_t *spa = dp->dp_spa; | |
1431 | int err; | |
1432 | ||
1433 | /* | |
1434 | * Check for scn_restart_txg before checking spa_load_state, so | |
1435 | * that we can restart an old-style scan while the pool is being | |
1436 | * imported (see dsl_scan_init). | |
1437 | */ | |
1438 | if (scn->scn_restart_txg != 0 && | |
1439 | scn->scn_restart_txg <= tx->tx_txg) { | |
1440 | pool_scan_func_t func = POOL_SCAN_SCRUB; | |
1441 | dsl_scan_done(scn, B_FALSE, tx); | |
1442 | if (vdev_resilver_needed(spa->spa_root_vdev, NULL, NULL)) | |
1443 | func = POOL_SCAN_RESILVER; | |
1444 | zfs_dbgmsg("restarting scan func=%u txg=%llu", | |
1445 | func, tx->tx_txg); | |
1446 | dsl_scan_setup_sync(scn, &func, tx); | |
1447 | } | |
1448 | ||
1449 | ||
1450 | if (!dsl_scan_active(scn) || | |
1451 | spa_sync_pass(dp->dp_spa) > 1) | |
1452 | return; | |
1453 | ||
1454 | scn->scn_visited_this_txg = 0; | |
1455 | scn->scn_pausing = B_FALSE; | |
1456 | scn->scn_sync_start_time = gethrtime(); | |
1457 | spa->spa_scrub_active = B_TRUE; | |
1458 | ||
1459 | /* | |
1460 | * First process the free list. If we pause the free, don't do | |
1461 | * any scanning. This ensures that there is no free list when | |
1462 | * we are scanning, so the scan code doesn't have to worry about | |
1463 | * traversing it. | |
1464 | */ | |
1465 | if (spa_version(dp->dp_spa) >= SPA_VERSION_DEADLISTS) { | |
1466 | scn->scn_zio_root = zio_root(dp->dp_spa, NULL, | |
1467 | NULL, ZIO_FLAG_MUSTSUCCEED); | |
1468 | err = bpobj_iterate(&dp->dp_free_bpobj, | |
1469 | dsl_scan_free_cb, scn, tx); | |
1470 | VERIFY3U(0, ==, zio_wait(scn->scn_zio_root)); | |
1471 | if (scn->scn_visited_this_txg) { | |
1472 | zfs_dbgmsg("freed %llu blocks in %llums from " | |
1473 | "free_bpobj txg %llu", | |
1474 | (longlong_t)scn->scn_visited_this_txg, | |
1475 | (longlong_t) | |
1476 | (gethrtime() - scn->scn_sync_start_time) / MICROSEC, | |
1477 | (longlong_t)tx->tx_txg); | |
1478 | scn->scn_visited_this_txg = 0; | |
1479 | /* | |
1480 | * Re-sync the ddt so that we can further modify | |
1481 | * it when doing bprewrite. | |
1482 | */ | |
1483 | ddt_sync(spa, tx->tx_txg); | |
1484 | } | |
1485 | if (err == ERESTART) | |
1486 | return; | |
1487 | } | |
1488 | ||
1489 | if (scn->scn_phys.scn_state != DSS_SCANNING) | |
1490 | return; | |
1491 | ||
1492 | ||
1493 | if (scn->scn_phys.scn_ddt_bookmark.ddb_class <= | |
1494 | scn->scn_phys.scn_ddt_class_max) { | |
1495 | zfs_dbgmsg("doing scan sync txg %llu; " | |
1496 | "ddt bm=%llu/%llu/%llu/%llx", | |
1497 | (longlong_t)tx->tx_txg, | |
1498 | (longlong_t)scn->scn_phys.scn_ddt_bookmark.ddb_class, | |
1499 | (longlong_t)scn->scn_phys.scn_ddt_bookmark.ddb_type, | |
1500 | (longlong_t)scn->scn_phys.scn_ddt_bookmark.ddb_checksum, | |
1501 | (longlong_t)scn->scn_phys.scn_ddt_bookmark.ddb_cursor); | |
1502 | ASSERT(scn->scn_phys.scn_bookmark.zb_objset == 0); | |
1503 | ASSERT(scn->scn_phys.scn_bookmark.zb_object == 0); | |
1504 | ASSERT(scn->scn_phys.scn_bookmark.zb_level == 0); | |
1505 | ASSERT(scn->scn_phys.scn_bookmark.zb_blkid == 0); | |
1506 | } else { | |
1507 | zfs_dbgmsg("doing scan sync txg %llu; bm=%llu/%llu/%llu/%llu", | |
1508 | (longlong_t)tx->tx_txg, | |
1509 | (longlong_t)scn->scn_phys.scn_bookmark.zb_objset, | |
1510 | (longlong_t)scn->scn_phys.scn_bookmark.zb_object, | |
1511 | (longlong_t)scn->scn_phys.scn_bookmark.zb_level, | |
1512 | (longlong_t)scn->scn_phys.scn_bookmark.zb_blkid); | |
1513 | } | |
1514 | ||
1515 | scn->scn_zio_root = zio_root(dp->dp_spa, NULL, | |
1516 | NULL, ZIO_FLAG_CANFAIL); | |
1517 | dsl_scan_visit(scn, tx); | |
1518 | (void) zio_wait(scn->scn_zio_root); | |
1519 | scn->scn_zio_root = NULL; | |
1520 | ||
1521 | zfs_dbgmsg("visited %llu blocks in %llums", | |
1522 | (longlong_t)scn->scn_visited_this_txg, | |
1523 | (longlong_t)(gethrtime() - scn->scn_sync_start_time) / MICROSEC); | |
1524 | ||
1525 | if (!scn->scn_pausing) { | |
1526 | /* finished with scan. */ | |
1527 | zfs_dbgmsg("finished scan txg %llu", (longlong_t)tx->tx_txg); | |
1528 | dsl_scan_done(scn, B_TRUE, tx); | |
1529 | } | |
1530 | ||
1531 | if (DSL_SCAN_IS_SCRUB_RESILVER(scn)) { | |
1532 | mutex_enter(&spa->spa_scrub_lock); | |
1533 | while (spa->spa_scrub_inflight > 0) { | |
1534 | cv_wait(&spa->spa_scrub_io_cv, | |
1535 | &spa->spa_scrub_lock); | |
1536 | } | |
1537 | mutex_exit(&spa->spa_scrub_lock); | |
1538 | } | |
1539 | ||
1540 | dsl_scan_sync_state(scn, tx); | |
1541 | } | |
1542 | ||
1543 | /* | |
1544 | * This will start a new scan, or restart an existing one. | |
1545 | */ | |
1546 | void | |
1547 | dsl_resilver_restart(dsl_pool_t *dp, uint64_t txg) | |
1548 | { | |
1549 | if (txg == 0) { | |
1550 | dmu_tx_t *tx; | |
1551 | tx = dmu_tx_create_dd(dp->dp_mos_dir); | |
1552 | VERIFY(0 == dmu_tx_assign(tx, TXG_WAIT)); | |
1553 | ||
1554 | txg = dmu_tx_get_txg(tx); | |
1555 | dp->dp_scan->scn_restart_txg = txg; | |
1556 | dmu_tx_commit(tx); | |
1557 | } else { | |
1558 | dp->dp_scan->scn_restart_txg = txg; | |
1559 | } | |
1560 | zfs_dbgmsg("restarting resilver txg=%llu", txg); | |
1561 | } | |
1562 | ||
1563 | boolean_t | |
1564 | dsl_scan_resilvering(dsl_pool_t *dp) | |
1565 | { | |
1566 | return (dp->dp_scan->scn_phys.scn_state == DSS_SCANNING && | |
1567 | dp->dp_scan->scn_phys.scn_func == POOL_SCAN_RESILVER); | |
1568 | } | |
1569 | ||
1570 | /* | |
1571 | * scrub consumers | |
1572 | */ | |
1573 | ||
1574 | static void | |
1575 | count_block(zfs_all_blkstats_t *zab, const blkptr_t *bp) | |
1576 | { | |
1577 | int i; | |
1578 | ||
1579 | /* | |
1580 | * If we resume after a reboot, zab will be NULL; don't record | |
1581 | * incomplete stats in that case. | |
1582 | */ | |
1583 | if (zab == NULL) | |
1584 | return; | |
1585 | ||
1586 | for (i = 0; i < 4; i++) { | |
1587 | int l = (i < 2) ? BP_GET_LEVEL(bp) : DN_MAX_LEVELS; | |
1588 | int t = (i & 1) ? BP_GET_TYPE(bp) : DMU_OT_TOTAL; | |
1589 | zfs_blkstat_t *zb = &zab->zab_type[l][t]; | |
1590 | int equal; | |
1591 | ||
1592 | zb->zb_count++; | |
1593 | zb->zb_asize += BP_GET_ASIZE(bp); | |
1594 | zb->zb_lsize += BP_GET_LSIZE(bp); | |
1595 | zb->zb_psize += BP_GET_PSIZE(bp); | |
1596 | zb->zb_gangs += BP_COUNT_GANG(bp); | |
1597 | ||
1598 | switch (BP_GET_NDVAS(bp)) { | |
1599 | case 2: | |
1600 | if (DVA_GET_VDEV(&bp->blk_dva[0]) == | |
1601 | DVA_GET_VDEV(&bp->blk_dva[1])) | |
1602 | zb->zb_ditto_2_of_2_samevdev++; | |
1603 | break; | |
1604 | case 3: | |
1605 | equal = (DVA_GET_VDEV(&bp->blk_dva[0]) == | |
1606 | DVA_GET_VDEV(&bp->blk_dva[1])) + | |
1607 | (DVA_GET_VDEV(&bp->blk_dva[0]) == | |
1608 | DVA_GET_VDEV(&bp->blk_dva[2])) + | |
1609 | (DVA_GET_VDEV(&bp->blk_dva[1]) == | |
1610 | DVA_GET_VDEV(&bp->blk_dva[2])); | |
1611 | if (equal == 1) | |
1612 | zb->zb_ditto_2_of_3_samevdev++; | |
1613 | else if (equal == 3) | |
1614 | zb->zb_ditto_3_of_3_samevdev++; | |
1615 | break; | |
1616 | } | |
1617 | } | |
1618 | } | |
1619 | ||
1620 | static void | |
1621 | dsl_scan_scrub_done(zio_t *zio) | |
1622 | { | |
1623 | spa_t *spa = zio->io_spa; | |
1624 | ||
1625 | zio_data_buf_free(zio->io_data, zio->io_size); | |
1626 | ||
1627 | mutex_enter(&spa->spa_scrub_lock); | |
1628 | spa->spa_scrub_inflight--; | |
1629 | cv_broadcast(&spa->spa_scrub_io_cv); | |
1630 | ||
1631 | if (zio->io_error && (zio->io_error != ECKSUM || | |
1632 | !(zio->io_flags & ZIO_FLAG_SPECULATIVE))) { | |
1633 | spa->spa_dsl_pool->dp_scan->scn_phys.scn_errors++; | |
1634 | } | |
1635 | mutex_exit(&spa->spa_scrub_lock); | |
1636 | } | |
1637 | ||
1638 | static int | |
1639 | dsl_scan_scrub_cb(dsl_pool_t *dp, | |
1640 | const blkptr_t *bp, const zbookmark_t *zb) | |
1641 | { | |
1642 | dsl_scan_t *scn = dp->dp_scan; | |
1643 | size_t size = BP_GET_PSIZE(bp); | |
1644 | spa_t *spa = dp->dp_spa; | |
1645 | uint64_t phys_birth = BP_PHYSICAL_BIRTH(bp); | |
1646 | boolean_t needs_io; | |
1647 | int zio_flags = ZIO_FLAG_SCRUB_THREAD | ZIO_FLAG_RAW | ZIO_FLAG_CANFAIL; | |
1648 | int zio_priority; | |
1649 | ||
1650 | if (phys_birth <= scn->scn_phys.scn_min_txg || | |
1651 | phys_birth >= scn->scn_phys.scn_max_txg) | |
1652 | return (0); | |
1653 | ||
1654 | count_block(dp->dp_blkstats, bp); | |
1655 | ||
1656 | ASSERT(DSL_SCAN_IS_SCRUB_RESILVER(scn)); | |
1657 | if (scn->scn_phys.scn_func == POOL_SCAN_SCRUB) { | |
1658 | zio_flags |= ZIO_FLAG_SCRUB; | |
1659 | zio_priority = ZIO_PRIORITY_SCRUB; | |
1660 | needs_io = B_TRUE; | |
1661 | } else if (scn->scn_phys.scn_func == POOL_SCAN_RESILVER) { | |
1662 | zio_flags |= ZIO_FLAG_RESILVER; | |
1663 | zio_priority = ZIO_PRIORITY_RESILVER; | |
1664 | needs_io = B_FALSE; | |
1665 | } | |
1666 | ||
1667 | /* If it's an intent log block, failure is expected. */ | |
1668 | if (zb->zb_level == ZB_ZIL_LEVEL) | |
1669 | zio_flags |= ZIO_FLAG_SPECULATIVE; | |
1670 | ||
1671 | for (int d = 0; d < BP_GET_NDVAS(bp); d++) { | |
1672 | vdev_t *vd = vdev_lookup_top(spa, | |
1673 | DVA_GET_VDEV(&bp->blk_dva[d])); | |
1674 | ||
1675 | /* | |
1676 | * Keep track of how much data we've examined so that | |
1677 | * zpool(1M) status can make useful progress reports. | |
1678 | */ | |
1679 | scn->scn_phys.scn_examined += DVA_GET_ASIZE(&bp->blk_dva[d]); | |
1680 | spa->spa_scan_pass_exam += DVA_GET_ASIZE(&bp->blk_dva[d]); | |
1681 | ||
1682 | /* if it's a resilver, this may not be in the target range */ | |
1683 | if (!needs_io) { | |
1684 | if (DVA_GET_GANG(&bp->blk_dva[d])) { | |
1685 | /* | |
1686 | * Gang members may be spread across multiple | |
1687 | * vdevs, so the best estimate we have is the | |
1688 | * scrub range, which has already been checked. | |
1689 | * XXX -- it would be better to change our | |
1690 | * allocation policy to ensure that all | |
1691 | * gang members reside on the same vdev. | |
1692 | */ | |
1693 | needs_io = B_TRUE; | |
1694 | } else { | |
1695 | needs_io = vdev_dtl_contains(vd, DTL_PARTIAL, | |
1696 | phys_birth, 1); | |
1697 | } | |
1698 | } | |
1699 | } | |
1700 | ||
1701 | if (needs_io && !zfs_no_scrub_io) { | |
1702 | void *data = zio_data_buf_alloc(size); | |
1703 | ||
1704 | mutex_enter(&spa->spa_scrub_lock); | |
1705 | while (spa->spa_scrub_inflight >= spa->spa_scrub_maxinflight) | |
1706 | cv_wait(&spa->spa_scrub_io_cv, &spa->spa_scrub_lock); | |
1707 | spa->spa_scrub_inflight++; | |
1708 | mutex_exit(&spa->spa_scrub_lock); | |
1709 | ||
1710 | zio_nowait(zio_read(NULL, spa, bp, data, size, | |
1711 | dsl_scan_scrub_done, NULL, zio_priority, | |
1712 | zio_flags, zb)); | |
1713 | } | |
1714 | ||
1715 | /* do not relocate this block */ | |
1716 | return (0); | |
1717 | } | |
1718 | ||
1719 | int | |
1720 | dsl_scan(dsl_pool_t *dp, pool_scan_func_t func) | |
1721 | { | |
1722 | spa_t *spa = dp->dp_spa; | |
1723 | ||
1724 | /* | |
1725 | * Purge all vdev caches and probe all devices. We do this here | |
1726 | * rather than in sync context because this requires a writer lock | |
1727 | * on the spa_config lock, which we can't do from sync context. The | |
1728 | * spa_scrub_reopen flag indicates that vdev_open() should not | |
1729 | * attempt to start another scrub. | |
1730 | */ | |
1731 | spa_vdev_state_enter(spa, SCL_NONE); | |
1732 | spa->spa_scrub_reopen = B_TRUE; | |
1733 | vdev_reopen(spa->spa_root_vdev); | |
1734 | spa->spa_scrub_reopen = B_FALSE; | |
1735 | (void) spa_vdev_state_exit(spa, NULL, 0); | |
1736 | ||
1737 | return (dsl_sync_task_do(dp, dsl_scan_setup_check, | |
1738 | dsl_scan_setup_sync, dp->dp_scan, &func, 0)); | |
1739 | } |