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428870ff BB |
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. | |
9ae529ec | 23 | * Copyright (c) 2012 by Delphix. All rights reserved. |
428870ff BB |
24 | */ |
25 | ||
26 | #include <sys/dsl_scan.h> | |
27 | #include <sys/dsl_pool.h> | |
28 | #include <sys/dsl_dataset.h> | |
29 | #include <sys/dsl_prop.h> | |
30 | #include <sys/dsl_dir.h> | |
31 | #include <sys/dsl_synctask.h> | |
32 | #include <sys/dnode.h> | |
33 | #include <sys/dmu_tx.h> | |
34 | #include <sys/dmu_objset.h> | |
35 | #include <sys/arc.h> | |
36 | #include <sys/zap.h> | |
37 | #include <sys/zio.h> | |
38 | #include <sys/zfs_context.h> | |
39 | #include <sys/fs/zfs.h> | |
40 | #include <sys/zfs_znode.h> | |
41 | #include <sys/spa_impl.h> | |
42 | #include <sys/vdev_impl.h> | |
43 | #include <sys/zil_impl.h> | |
44 | #include <sys/zio_checksum.h> | |
45 | #include <sys/ddt.h> | |
46 | #include <sys/sa.h> | |
47 | #include <sys/sa_impl.h> | |
9ae529ec | 48 | #include <sys/zfeature.h> |
428870ff BB |
49 | #ifdef _KERNEL |
50 | #include <sys/zfs_vfsops.h> | |
51 | #endif | |
52 | ||
53 | typedef int (scan_cb_t)(dsl_pool_t *, const blkptr_t *, const zbookmark_t *); | |
54 | ||
428870ff | 55 | static scan_cb_t dsl_scan_scrub_cb; |
13fe0198 | 56 | static void dsl_scan_cancel_sync(void *, dmu_tx_t *); |
428870ff BB |
57 | static void dsl_scan_sync_state(dsl_scan_t *, dmu_tx_t *tx); |
58 | ||
572e2857 BB |
59 | int zfs_top_maxinflight = 32; /* maximum I/Os per top-level */ |
60 | int zfs_resilver_delay = 2; /* number of ticks to delay resilver */ | |
61 | int zfs_scrub_delay = 4; /* number of ticks to delay scrub */ | |
62 | int zfs_scan_idle = 50; /* idle window in clock ticks */ | |
63 | ||
428870ff BB |
64 | int zfs_scan_min_time_ms = 1000; /* min millisecs to scrub per txg */ |
65 | int zfs_free_min_time_ms = 1000; /* min millisecs to free per txg */ | |
66 | int zfs_resilver_min_time_ms = 3000; /* min millisecs to resilver per txg */ | |
c409e464 BB |
67 | int zfs_no_scrub_io = B_FALSE; /* set to disable scrub i/o */ |
68 | int zfs_no_scrub_prefetch = B_FALSE; /* set to disable srub prefetching */ | |
428870ff BB |
69 | enum ddt_class zfs_scrub_ddt_class_max = DDT_CLASS_DUPLICATE; |
70 | int dsl_scan_delay_completion = B_FALSE; /* set to delay scan completion */ | |
71 | ||
72 | #define DSL_SCAN_IS_SCRUB_RESILVER(scn) \ | |
73 | ((scn)->scn_phys.scn_func == POOL_SCAN_SCRUB || \ | |
74 | (scn)->scn_phys.scn_func == POOL_SCAN_RESILVER) | |
75 | ||
428870ff BB |
76 | /* the order has to match pool_scan_type */ |
77 | static scan_cb_t *scan_funcs[POOL_SCAN_FUNCS] = { | |
78 | NULL, | |
79 | dsl_scan_scrub_cb, /* POOL_SCAN_SCRUB */ | |
80 | dsl_scan_scrub_cb, /* POOL_SCAN_RESILVER */ | |
81 | }; | |
82 | ||
83 | int | |
84 | dsl_scan_init(dsl_pool_t *dp, uint64_t txg) | |
85 | { | |
86 | int err; | |
87 | dsl_scan_t *scn; | |
88 | spa_t *spa = dp->dp_spa; | |
89 | uint64_t f; | |
90 | ||
91 | scn = dp->dp_scan = kmem_zalloc(sizeof (dsl_scan_t), KM_SLEEP); | |
92 | scn->scn_dp = dp; | |
93 | ||
94 | err = zap_lookup(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT, | |
95 | "scrub_func", sizeof (uint64_t), 1, &f); | |
96 | if (err == 0) { | |
97 | /* | |
98 | * There was an old-style scrub in progress. Restart a | |
99 | * new-style scrub from the beginning. | |
100 | */ | |
101 | scn->scn_restart_txg = txg; | |
102 | zfs_dbgmsg("old-style scrub was in progress; " | |
103 | "restarting new-style scrub in txg %llu", | |
104 | scn->scn_restart_txg); | |
105 | ||
106 | /* | |
107 | * Load the queue obj from the old location so that it | |
108 | * can be freed by dsl_scan_done(). | |
109 | */ | |
110 | (void) zap_lookup(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT, | |
111 | "scrub_queue", sizeof (uint64_t), 1, | |
112 | &scn->scn_phys.scn_queue_obj); | |
113 | } else { | |
114 | err = zap_lookup(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT, | |
115 | DMU_POOL_SCAN, sizeof (uint64_t), SCAN_PHYS_NUMINTS, | |
116 | &scn->scn_phys); | |
117 | if (err == ENOENT) | |
118 | return (0); | |
119 | else if (err) | |
120 | return (err); | |
121 | ||
122 | if (scn->scn_phys.scn_state == DSS_SCANNING && | |
123 | spa_prev_software_version(dp->dp_spa) < SPA_VERSION_SCAN) { | |
124 | /* | |
125 | * A new-type scrub was in progress on an old | |
126 | * pool, and the pool was accessed by old | |
127 | * software. Restart from the beginning, since | |
128 | * the old software may have changed the pool in | |
129 | * the meantime. | |
130 | */ | |
131 | scn->scn_restart_txg = txg; | |
132 | zfs_dbgmsg("new-style scrub was modified " | |
133 | "by old software; restarting in txg %llu", | |
134 | scn->scn_restart_txg); | |
135 | } | |
136 | } | |
137 | ||
138 | spa_scan_stat_init(spa); | |
139 | return (0); | |
140 | } | |
141 | ||
142 | void | |
143 | dsl_scan_fini(dsl_pool_t *dp) | |
144 | { | |
145 | if (dp->dp_scan) { | |
146 | kmem_free(dp->dp_scan, sizeof (dsl_scan_t)); | |
147 | dp->dp_scan = NULL; | |
148 | } | |
149 | } | |
150 | ||
151 | /* ARGSUSED */ | |
152 | static int | |
13fe0198 | 153 | dsl_scan_setup_check(void *arg, dmu_tx_t *tx) |
428870ff | 154 | { |
13fe0198 | 155 | dsl_scan_t *scn = dmu_tx_pool(tx)->dp_scan; |
428870ff BB |
156 | |
157 | if (scn->scn_phys.scn_state == DSS_SCANNING) | |
158 | return (EBUSY); | |
159 | ||
160 | return (0); | |
161 | } | |
162 | ||
428870ff | 163 | static void |
13fe0198 | 164 | dsl_scan_setup_sync(void *arg, dmu_tx_t *tx) |
428870ff | 165 | { |
13fe0198 MA |
166 | dsl_scan_t *scn = dmu_tx_pool(tx)->dp_scan; |
167 | pool_scan_func_t *funcp = arg; | |
428870ff BB |
168 | dmu_object_type_t ot = 0; |
169 | dsl_pool_t *dp = scn->scn_dp; | |
170 | spa_t *spa = dp->dp_spa; | |
171 | ||
172 | ASSERT(scn->scn_phys.scn_state != DSS_SCANNING); | |
173 | ASSERT(*funcp > POOL_SCAN_NONE && *funcp < POOL_SCAN_FUNCS); | |
174 | bzero(&scn->scn_phys, sizeof (scn->scn_phys)); | |
175 | scn->scn_phys.scn_func = *funcp; | |
176 | scn->scn_phys.scn_state = DSS_SCANNING; | |
177 | scn->scn_phys.scn_min_txg = 0; | |
178 | scn->scn_phys.scn_max_txg = tx->tx_txg; | |
179 | scn->scn_phys.scn_ddt_class_max = DDT_CLASSES - 1; /* the entire DDT */ | |
180 | scn->scn_phys.scn_start_time = gethrestime_sec(); | |
181 | scn->scn_phys.scn_errors = 0; | |
182 | scn->scn_phys.scn_to_examine = spa->spa_root_vdev->vdev_stat.vs_alloc; | |
183 | scn->scn_restart_txg = 0; | |
184 | spa_scan_stat_init(spa); | |
185 | ||
186 | if (DSL_SCAN_IS_SCRUB_RESILVER(scn)) { | |
187 | scn->scn_phys.scn_ddt_class_max = zfs_scrub_ddt_class_max; | |
188 | ||
189 | /* rewrite all disk labels */ | |
190 | vdev_config_dirty(spa->spa_root_vdev); | |
191 | ||
192 | if (vdev_resilver_needed(spa->spa_root_vdev, | |
193 | &scn->scn_phys.scn_min_txg, &scn->scn_phys.scn_max_txg)) { | |
26685276 | 194 | spa_event_notify(spa, NULL, FM_EREPORT_ZFS_RESILVER_START); |
428870ff | 195 | } else { |
26685276 | 196 | spa_event_notify(spa, NULL, FM_EREPORT_ZFS_SCRUB_START); |
428870ff BB |
197 | } |
198 | ||
199 | spa->spa_scrub_started = B_TRUE; | |
200 | /* | |
201 | * If this is an incremental scrub, limit the DDT scrub phase | |
202 | * to just the auto-ditto class (for correctness); the rest | |
203 | * of the scrub should go faster using top-down pruning. | |
204 | */ | |
205 | if (scn->scn_phys.scn_min_txg > TXG_INITIAL) | |
206 | scn->scn_phys.scn_ddt_class_max = DDT_CLASS_DITTO; | |
207 | ||
208 | } | |
209 | ||
210 | /* back to the generic stuff */ | |
211 | ||
212 | if (dp->dp_blkstats == NULL) { | |
398f129c | 213 | dp->dp_blkstats = kmem_alloc(sizeof (zfs_all_blkstats_t), |
20a083cb | 214 | KM_PUSHPAGE | KM_NODEBUG); |
428870ff BB |
215 | } |
216 | bzero(dp->dp_blkstats, sizeof (zfs_all_blkstats_t)); | |
217 | ||
218 | if (spa_version(spa) < SPA_VERSION_DSL_SCRUB) | |
219 | ot = DMU_OT_ZAP_OTHER; | |
220 | ||
221 | scn->scn_phys.scn_queue_obj = zap_create(dp->dp_meta_objset, | |
222 | ot ? ot : DMU_OT_SCAN_QUEUE, DMU_OT_NONE, 0, tx); | |
223 | ||
224 | dsl_scan_sync_state(scn, tx); | |
225 | ||
6f1ffb06 | 226 | spa_history_log_internal(spa, "scan setup", tx, |
428870ff BB |
227 | "func=%u mintxg=%llu maxtxg=%llu", |
228 | *funcp, scn->scn_phys.scn_min_txg, scn->scn_phys.scn_max_txg); | |
229 | } | |
230 | ||
231 | /* ARGSUSED */ | |
232 | static void | |
233 | dsl_scan_done(dsl_scan_t *scn, boolean_t complete, dmu_tx_t *tx) | |
234 | { | |
235 | static const char *old_names[] = { | |
236 | "scrub_bookmark", | |
237 | "scrub_ddt_bookmark", | |
238 | "scrub_ddt_class_max", | |
239 | "scrub_queue", | |
240 | "scrub_min_txg", | |
241 | "scrub_max_txg", | |
242 | "scrub_func", | |
243 | "scrub_errors", | |
244 | NULL | |
245 | }; | |
246 | ||
247 | dsl_pool_t *dp = scn->scn_dp; | |
248 | spa_t *spa = dp->dp_spa; | |
249 | int i; | |
250 | ||
251 | /* Remove any remnants of an old-style scrub. */ | |
252 | for (i = 0; old_names[i]; i++) { | |
253 | (void) zap_remove(dp->dp_meta_objset, | |
254 | DMU_POOL_DIRECTORY_OBJECT, old_names[i], tx); | |
255 | } | |
256 | ||
257 | if (scn->scn_phys.scn_queue_obj != 0) { | |
258 | VERIFY(0 == dmu_object_free(dp->dp_meta_objset, | |
259 | scn->scn_phys.scn_queue_obj, tx)); | |
260 | scn->scn_phys.scn_queue_obj = 0; | |
261 | } | |
262 | ||
263 | /* | |
264 | * If we were "restarted" from a stopped state, don't bother | |
265 | * with anything else. | |
266 | */ | |
267 | if (scn->scn_phys.scn_state != DSS_SCANNING) | |
268 | return; | |
269 | ||
270 | if (complete) | |
271 | scn->scn_phys.scn_state = DSS_FINISHED; | |
272 | else | |
273 | scn->scn_phys.scn_state = DSS_CANCELED; | |
274 | ||
6f1ffb06 | 275 | spa_history_log_internal(spa, "scan done", tx, |
428870ff BB |
276 | "complete=%u", complete); |
277 | ||
278 | if (DSL_SCAN_IS_SCRUB_RESILVER(scn)) { | |
279 | mutex_enter(&spa->spa_scrub_lock); | |
280 | while (spa->spa_scrub_inflight > 0) { | |
281 | cv_wait(&spa->spa_scrub_io_cv, | |
282 | &spa->spa_scrub_lock); | |
283 | } | |
284 | mutex_exit(&spa->spa_scrub_lock); | |
285 | spa->spa_scrub_started = B_FALSE; | |
286 | spa->spa_scrub_active = B_FALSE; | |
287 | ||
288 | /* | |
289 | * If the scrub/resilver completed, update all DTLs to | |
290 | * reflect this. Whether it succeeded or not, vacate | |
291 | * all temporary scrub DTLs. | |
292 | */ | |
293 | vdev_dtl_reassess(spa->spa_root_vdev, tx->tx_txg, | |
294 | complete ? scn->scn_phys.scn_max_txg : 0, B_TRUE); | |
295 | if (complete) { | |
296 | spa_event_notify(spa, NULL, scn->scn_phys.scn_min_txg ? | |
26685276 BB |
297 | FM_EREPORT_ZFS_RESILVER_FINISH : |
298 | FM_EREPORT_ZFS_SCRUB_FINISH); | |
428870ff BB |
299 | } |
300 | spa_errlog_rotate(spa); | |
301 | ||
302 | /* | |
303 | * We may have finished replacing a device. | |
304 | * Let the async thread assess this and handle the detach. | |
305 | */ | |
306 | spa_async_request(spa, SPA_ASYNC_RESILVER_DONE); | |
307 | } | |
308 | ||
309 | scn->scn_phys.scn_end_time = gethrestime_sec(); | |
310 | } | |
311 | ||
312 | /* ARGSUSED */ | |
313 | static int | |
13fe0198 | 314 | dsl_scan_cancel_check(void *arg, dmu_tx_t *tx) |
428870ff | 315 | { |
13fe0198 | 316 | dsl_scan_t *scn = dmu_tx_pool(tx)->dp_scan; |
428870ff BB |
317 | |
318 | if (scn->scn_phys.scn_state != DSS_SCANNING) | |
319 | return (ENOENT); | |
320 | return (0); | |
321 | } | |
322 | ||
323 | /* ARGSUSED */ | |
324 | static void | |
13fe0198 | 325 | dsl_scan_cancel_sync(void *arg, dmu_tx_t *tx) |
428870ff | 326 | { |
13fe0198 | 327 | dsl_scan_t *scn = dmu_tx_pool(tx)->dp_scan; |
428870ff BB |
328 | |
329 | dsl_scan_done(scn, B_FALSE, tx); | |
330 | dsl_scan_sync_state(scn, tx); | |
331 | } | |
332 | ||
333 | int | |
334 | dsl_scan_cancel(dsl_pool_t *dp) | |
335 | { | |
13fe0198 MA |
336 | return (dsl_sync_task(spa_name(dp->dp_spa), dsl_scan_cancel_check, |
337 | dsl_scan_cancel_sync, NULL, 3)); | |
428870ff BB |
338 | } |
339 | ||
340 | static void dsl_scan_visitbp(blkptr_t *bp, | |
341 | const zbookmark_t *zb, dnode_phys_t *dnp, arc_buf_t *pbuf, | |
342 | dsl_dataset_t *ds, dsl_scan_t *scn, dmu_objset_type_t ostype, | |
343 | dmu_tx_t *tx); | |
10be533e BB |
344 | inline __attribute__((always_inline)) static void dsl_scan_visitdnode( |
345 | dsl_scan_t *, dsl_dataset_t *ds, dmu_objset_type_t ostype, | |
428870ff BB |
346 | dnode_phys_t *dnp, arc_buf_t *buf, uint64_t object, dmu_tx_t *tx); |
347 | ||
348 | void | |
349 | dsl_free(dsl_pool_t *dp, uint64_t txg, const blkptr_t *bp) | |
350 | { | |
351 | zio_free(dp->dp_spa, txg, bp); | |
352 | } | |
353 | ||
354 | void | |
355 | dsl_free_sync(zio_t *pio, dsl_pool_t *dp, uint64_t txg, const blkptr_t *bpp) | |
356 | { | |
357 | ASSERT(dsl_pool_sync_context(dp)); | |
358 | zio_nowait(zio_free_sync(pio, dp->dp_spa, txg, bpp, pio->io_flags)); | |
359 | } | |
360 | ||
428870ff BB |
361 | static uint64_t |
362 | dsl_scan_ds_maxtxg(dsl_dataset_t *ds) | |
363 | { | |
364 | uint64_t smt = ds->ds_dir->dd_pool->dp_scan->scn_phys.scn_max_txg; | |
365 | if (dsl_dataset_is_snapshot(ds)) | |
366 | return (MIN(smt, ds->ds_phys->ds_creation_txg)); | |
367 | return (smt); | |
368 | } | |
369 | ||
370 | static void | |
371 | dsl_scan_sync_state(dsl_scan_t *scn, dmu_tx_t *tx) | |
372 | { | |
13fe0198 | 373 | VERIFY0(zap_update(scn->scn_dp->dp_meta_objset, |
428870ff BB |
374 | DMU_POOL_DIRECTORY_OBJECT, |
375 | DMU_POOL_SCAN, sizeof (uint64_t), SCAN_PHYS_NUMINTS, | |
376 | &scn->scn_phys, tx)); | |
377 | } | |
378 | ||
379 | static boolean_t | |
380 | dsl_scan_check_pause(dsl_scan_t *scn, const zbookmark_t *zb) | |
381 | { | |
382 | uint64_t elapsed_nanosecs; | |
383 | int mintime; | |
384 | ||
385 | /* we never skip user/group accounting objects */ | |
386 | if (zb && (int64_t)zb->zb_object < 0) | |
387 | return (B_FALSE); | |
388 | ||
389 | if (scn->scn_pausing) | |
390 | return (B_TRUE); /* we're already pausing */ | |
391 | ||
9ae529ec | 392 | if (!ZB_IS_ZERO(&scn->scn_phys.scn_bookmark)) |
428870ff BB |
393 | return (B_FALSE); /* we're resuming */ |
394 | ||
395 | /* We only know how to resume from level-0 blocks. */ | |
396 | if (zb && zb->zb_level != 0) | |
397 | return (B_FALSE); | |
398 | ||
399 | mintime = (scn->scn_phys.scn_func == POOL_SCAN_RESILVER) ? | |
400 | zfs_resilver_min_time_ms : zfs_scan_min_time_ms; | |
401 | elapsed_nanosecs = gethrtime() - scn->scn_sync_start_time; | |
402 | if (elapsed_nanosecs / NANOSEC > zfs_txg_timeout || | |
403 | (elapsed_nanosecs / MICROSEC > mintime && | |
404 | txg_sync_waiting(scn->scn_dp)) || | |
405 | spa_shutting_down(scn->scn_dp->dp_spa)) { | |
406 | if (zb) { | |
407 | dprintf("pausing at bookmark %llx/%llx/%llx/%llx\n", | |
408 | (longlong_t)zb->zb_objset, | |
409 | (longlong_t)zb->zb_object, | |
410 | (longlong_t)zb->zb_level, | |
411 | (longlong_t)zb->zb_blkid); | |
412 | scn->scn_phys.scn_bookmark = *zb; | |
413 | } | |
414 | dprintf("pausing at DDT bookmark %llx/%llx/%llx/%llx\n", | |
415 | (longlong_t)scn->scn_phys.scn_ddt_bookmark.ddb_class, | |
416 | (longlong_t)scn->scn_phys.scn_ddt_bookmark.ddb_type, | |
417 | (longlong_t)scn->scn_phys.scn_ddt_bookmark.ddb_checksum, | |
418 | (longlong_t)scn->scn_phys.scn_ddt_bookmark.ddb_cursor); | |
419 | scn->scn_pausing = B_TRUE; | |
420 | return (B_TRUE); | |
421 | } | |
422 | return (B_FALSE); | |
423 | } | |
424 | ||
425 | typedef struct zil_scan_arg { | |
426 | dsl_pool_t *zsa_dp; | |
427 | zil_header_t *zsa_zh; | |
428 | } zil_scan_arg_t; | |
429 | ||
430 | /* ARGSUSED */ | |
431 | static int | |
432 | dsl_scan_zil_block(zilog_t *zilog, blkptr_t *bp, void *arg, uint64_t claim_txg) | |
433 | { | |
434 | zil_scan_arg_t *zsa = arg; | |
435 | dsl_pool_t *dp = zsa->zsa_dp; | |
436 | dsl_scan_t *scn = dp->dp_scan; | |
437 | zil_header_t *zh = zsa->zsa_zh; | |
438 | zbookmark_t zb; | |
439 | ||
440 | if (bp->blk_birth <= scn->scn_phys.scn_cur_min_txg) | |
441 | return (0); | |
442 | ||
443 | /* | |
444 | * One block ("stubby") can be allocated a long time ago; we | |
445 | * want to visit that one because it has been allocated | |
446 | * (on-disk) even if it hasn't been claimed (even though for | |
447 | * scrub there's nothing to do to it). | |
448 | */ | |
449 | if (claim_txg == 0 && bp->blk_birth >= spa_first_txg(dp->dp_spa)) | |
450 | return (0); | |
451 | ||
452 | SET_BOOKMARK(&zb, zh->zh_log.blk_cksum.zc_word[ZIL_ZC_OBJSET], | |
453 | ZB_ZIL_OBJECT, ZB_ZIL_LEVEL, bp->blk_cksum.zc_word[ZIL_ZC_SEQ]); | |
454 | ||
455 | VERIFY(0 == scan_funcs[scn->scn_phys.scn_func](dp, bp, &zb)); | |
456 | return (0); | |
457 | } | |
458 | ||
459 | /* ARGSUSED */ | |
460 | static int | |
461 | dsl_scan_zil_record(zilog_t *zilog, lr_t *lrc, void *arg, uint64_t claim_txg) | |
462 | { | |
463 | if (lrc->lrc_txtype == TX_WRITE) { | |
464 | zil_scan_arg_t *zsa = arg; | |
465 | dsl_pool_t *dp = zsa->zsa_dp; | |
466 | dsl_scan_t *scn = dp->dp_scan; | |
467 | zil_header_t *zh = zsa->zsa_zh; | |
468 | lr_write_t *lr = (lr_write_t *)lrc; | |
469 | blkptr_t *bp = &lr->lr_blkptr; | |
470 | zbookmark_t zb; | |
471 | ||
472 | if (bp->blk_birth <= scn->scn_phys.scn_cur_min_txg) | |
473 | return (0); | |
474 | ||
475 | /* | |
476 | * birth can be < claim_txg if this record's txg is | |
477 | * already txg sync'ed (but this log block contains | |
478 | * other records that are not synced) | |
479 | */ | |
480 | if (claim_txg == 0 || bp->blk_birth < claim_txg) | |
481 | return (0); | |
482 | ||
483 | SET_BOOKMARK(&zb, zh->zh_log.blk_cksum.zc_word[ZIL_ZC_OBJSET], | |
484 | lr->lr_foid, ZB_ZIL_LEVEL, | |
485 | lr->lr_offset / BP_GET_LSIZE(bp)); | |
486 | ||
487 | VERIFY(0 == scan_funcs[scn->scn_phys.scn_func](dp, bp, &zb)); | |
488 | } | |
489 | return (0); | |
490 | } | |
491 | ||
492 | static void | |
493 | dsl_scan_zil(dsl_pool_t *dp, zil_header_t *zh) | |
494 | { | |
495 | uint64_t claim_txg = zh->zh_claim_txg; | |
496 | zil_scan_arg_t zsa = { dp, zh }; | |
497 | zilog_t *zilog; | |
498 | ||
499 | /* | |
500 | * We only want to visit blocks that have been claimed but not yet | |
501 | * replayed (or, in read-only mode, blocks that *would* be claimed). | |
502 | */ | |
503 | if (claim_txg == 0 && spa_writeable(dp->dp_spa)) | |
504 | return; | |
505 | ||
506 | zilog = zil_alloc(dp->dp_meta_objset, zh); | |
507 | ||
508 | (void) zil_parse(zilog, dsl_scan_zil_block, dsl_scan_zil_record, &zsa, | |
509 | claim_txg); | |
510 | ||
511 | zil_free(zilog); | |
512 | } | |
513 | ||
514 | /* ARGSUSED */ | |
515 | static void | |
516 | dsl_scan_prefetch(dsl_scan_t *scn, arc_buf_t *buf, blkptr_t *bp, | |
517 | uint64_t objset, uint64_t object, uint64_t blkid) | |
518 | { | |
519 | zbookmark_t czb; | |
520 | uint32_t flags = ARC_NOWAIT | ARC_PREFETCH; | |
521 | ||
522 | if (zfs_no_scrub_prefetch) | |
523 | return; | |
524 | ||
525 | if (BP_IS_HOLE(bp) || bp->blk_birth <= scn->scn_phys.scn_min_txg || | |
526 | (BP_GET_LEVEL(bp) == 0 && BP_GET_TYPE(bp) != DMU_OT_DNODE)) | |
527 | return; | |
528 | ||
529 | SET_BOOKMARK(&czb, objset, object, BP_GET_LEVEL(bp), blkid); | |
530 | ||
428870ff | 531 | (void) arc_read(scn->scn_zio_root, scn->scn_dp->dp_spa, bp, |
294f6806 | 532 | NULL, NULL, ZIO_PRIORITY_ASYNC_READ, |
572e2857 | 533 | ZIO_FLAG_CANFAIL | ZIO_FLAG_SCAN_THREAD, &flags, &czb); |
428870ff BB |
534 | } |
535 | ||
536 | static boolean_t | |
537 | dsl_scan_check_resume(dsl_scan_t *scn, const dnode_phys_t *dnp, | |
538 | const zbookmark_t *zb) | |
539 | { | |
540 | /* | |
541 | * We never skip over user/group accounting objects (obj<0) | |
542 | */ | |
9ae529ec | 543 | if (!ZB_IS_ZERO(&scn->scn_phys.scn_bookmark) && |
428870ff BB |
544 | (int64_t)zb->zb_object >= 0) { |
545 | /* | |
546 | * If we already visited this bp & everything below (in | |
547 | * a prior txg sync), don't bother doing it again. | |
548 | */ | |
9ae529ec | 549 | if (zbookmark_is_before(dnp, zb, &scn->scn_phys.scn_bookmark)) |
428870ff BB |
550 | return (B_TRUE); |
551 | ||
552 | /* | |
553 | * If we found the block we're trying to resume from, or | |
554 | * we went past it to a different object, zero it out to | |
555 | * indicate that it's OK to start checking for pausing | |
556 | * again. | |
557 | */ | |
558 | if (bcmp(zb, &scn->scn_phys.scn_bookmark, sizeof (*zb)) == 0 || | |
559 | zb->zb_object > scn->scn_phys.scn_bookmark.zb_object) { | |
560 | dprintf("resuming at %llx/%llx/%llx/%llx\n", | |
561 | (longlong_t)zb->zb_objset, | |
562 | (longlong_t)zb->zb_object, | |
563 | (longlong_t)zb->zb_level, | |
564 | (longlong_t)zb->zb_blkid); | |
565 | bzero(&scn->scn_phys.scn_bookmark, sizeof (*zb)); | |
566 | } | |
567 | } | |
568 | return (B_FALSE); | |
569 | } | |
570 | ||
571 | /* | |
572 | * Return nonzero on i/o error. | |
573 | * Return new buf to write out in *bufp. | |
574 | */ | |
10be533e | 575 | inline __attribute__((always_inline)) static int |
428870ff BB |
576 | dsl_scan_recurse(dsl_scan_t *scn, dsl_dataset_t *ds, dmu_objset_type_t ostype, |
577 | dnode_phys_t *dnp, const blkptr_t *bp, | |
578 | const zbookmark_t *zb, dmu_tx_t *tx, arc_buf_t **bufp) | |
579 | { | |
580 | dsl_pool_t *dp = scn->scn_dp; | |
572e2857 | 581 | int zio_flags = ZIO_FLAG_CANFAIL | ZIO_FLAG_SCAN_THREAD; |
428870ff BB |
582 | int err; |
583 | ||
584 | if (BP_GET_LEVEL(bp) > 0) { | |
585 | uint32_t flags = ARC_WAIT; | |
586 | int i; | |
587 | blkptr_t *cbp; | |
588 | int epb = BP_GET_LSIZE(bp) >> SPA_BLKPTRSHIFT; | |
589 | ||
294f6806 | 590 | err = arc_read(NULL, dp->dp_spa, bp, arc_getbuf_func, bufp, |
572e2857 | 591 | ZIO_PRIORITY_ASYNC_READ, zio_flags, &flags, zb); |
428870ff BB |
592 | if (err) { |
593 | scn->scn_phys.scn_errors++; | |
594 | return (err); | |
595 | } | |
596 | for (i = 0, cbp = (*bufp)->b_data; i < epb; i++, cbp++) { | |
597 | dsl_scan_prefetch(scn, *bufp, cbp, zb->zb_objset, | |
598 | zb->zb_object, zb->zb_blkid * epb + i); | |
599 | } | |
600 | for (i = 0, cbp = (*bufp)->b_data; i < epb; i++, cbp++) { | |
601 | zbookmark_t czb; | |
602 | ||
603 | SET_BOOKMARK(&czb, zb->zb_objset, zb->zb_object, | |
604 | zb->zb_level - 1, | |
605 | zb->zb_blkid * epb + i); | |
606 | dsl_scan_visitbp(cbp, &czb, dnp, | |
607 | *bufp, ds, scn, ostype, tx); | |
608 | } | |
609 | } else if (BP_GET_TYPE(bp) == DMU_OT_USERGROUP_USED) { | |
610 | uint32_t flags = ARC_WAIT; | |
611 | ||
294f6806 | 612 | err = arc_read(NULL, dp->dp_spa, bp, arc_getbuf_func, bufp, |
572e2857 | 613 | ZIO_PRIORITY_ASYNC_READ, zio_flags, &flags, zb); |
428870ff BB |
614 | if (err) { |
615 | scn->scn_phys.scn_errors++; | |
616 | return (err); | |
617 | } | |
618 | } else if (BP_GET_TYPE(bp) == DMU_OT_DNODE) { | |
619 | uint32_t flags = ARC_WAIT; | |
620 | dnode_phys_t *cdnp; | |
621 | int i, j; | |
622 | int epb = BP_GET_LSIZE(bp) >> DNODE_SHIFT; | |
623 | ||
294f6806 | 624 | err = arc_read(NULL, dp->dp_spa, bp, arc_getbuf_func, bufp, |
572e2857 | 625 | ZIO_PRIORITY_ASYNC_READ, zio_flags, &flags, zb); |
428870ff BB |
626 | if (err) { |
627 | scn->scn_phys.scn_errors++; | |
628 | return (err); | |
629 | } | |
630 | for (i = 0, cdnp = (*bufp)->b_data; i < epb; i++, cdnp++) { | |
631 | for (j = 0; j < cdnp->dn_nblkptr; j++) { | |
632 | blkptr_t *cbp = &cdnp->dn_blkptr[j]; | |
633 | dsl_scan_prefetch(scn, *bufp, cbp, | |
634 | zb->zb_objset, zb->zb_blkid * epb + i, j); | |
635 | } | |
636 | } | |
637 | for (i = 0, cdnp = (*bufp)->b_data; i < epb; i++, cdnp++) { | |
638 | dsl_scan_visitdnode(scn, ds, ostype, | |
639 | cdnp, *bufp, zb->zb_blkid * epb + i, tx); | |
640 | } | |
641 | ||
642 | } else if (BP_GET_TYPE(bp) == DMU_OT_OBJSET) { | |
643 | uint32_t flags = ARC_WAIT; | |
644 | objset_phys_t *osp; | |
645 | ||
294f6806 | 646 | err = arc_read(NULL, dp->dp_spa, bp, arc_getbuf_func, bufp, |
572e2857 | 647 | ZIO_PRIORITY_ASYNC_READ, zio_flags, &flags, zb); |
428870ff BB |
648 | if (err) { |
649 | scn->scn_phys.scn_errors++; | |
650 | return (err); | |
651 | } | |
652 | ||
653 | osp = (*bufp)->b_data; | |
654 | ||
428870ff BB |
655 | dsl_scan_visitdnode(scn, ds, osp->os_type, |
656 | &osp->os_meta_dnode, *bufp, DMU_META_DNODE_OBJECT, tx); | |
657 | ||
658 | if (OBJSET_BUF_HAS_USERUSED(*bufp)) { | |
659 | /* | |
660 | * We also always visit user/group accounting | |
661 | * objects, and never skip them, even if we are | |
662 | * pausing. This is necessary so that the space | |
663 | * deltas from this txg get integrated. | |
664 | */ | |
665 | dsl_scan_visitdnode(scn, ds, osp->os_type, | |
666 | &osp->os_groupused_dnode, *bufp, | |
667 | DMU_GROUPUSED_OBJECT, tx); | |
668 | dsl_scan_visitdnode(scn, ds, osp->os_type, | |
669 | &osp->os_userused_dnode, *bufp, | |
670 | DMU_USERUSED_OBJECT, tx); | |
671 | } | |
672 | } | |
673 | ||
674 | return (0); | |
675 | } | |
676 | ||
10be533e | 677 | inline __attribute__((always_inline)) static void |
428870ff BB |
678 | dsl_scan_visitdnode(dsl_scan_t *scn, dsl_dataset_t *ds, |
679 | dmu_objset_type_t ostype, dnode_phys_t *dnp, arc_buf_t *buf, | |
680 | uint64_t object, dmu_tx_t *tx) | |
681 | { | |
682 | int j; | |
683 | ||
684 | for (j = 0; j < dnp->dn_nblkptr; j++) { | |
685 | zbookmark_t czb; | |
686 | ||
687 | SET_BOOKMARK(&czb, ds ? ds->ds_object : 0, object, | |
688 | dnp->dn_nlevels - 1, j); | |
689 | dsl_scan_visitbp(&dnp->dn_blkptr[j], | |
690 | &czb, dnp, buf, ds, scn, ostype, tx); | |
691 | } | |
692 | ||
693 | if (dnp->dn_flags & DNODE_FLAG_SPILL_BLKPTR) { | |
694 | zbookmark_t czb; | |
695 | SET_BOOKMARK(&czb, ds ? ds->ds_object : 0, object, | |
696 | 0, DMU_SPILL_BLKID); | |
697 | dsl_scan_visitbp(&dnp->dn_spill, | |
698 | &czb, dnp, buf, ds, scn, ostype, tx); | |
699 | } | |
700 | } | |
701 | ||
702 | /* | |
703 | * The arguments are in this order because mdb can only print the | |
704 | * first 5; we want them to be useful. | |
705 | */ | |
706 | static void | |
707 | dsl_scan_visitbp(blkptr_t *bp, const zbookmark_t *zb, | |
708 | dnode_phys_t *dnp, arc_buf_t *pbuf, | |
709 | dsl_dataset_t *ds, dsl_scan_t *scn, dmu_objset_type_t ostype, | |
710 | dmu_tx_t *tx) | |
711 | { | |
712 | dsl_pool_t *dp = scn->scn_dp; | |
713 | arc_buf_t *buf = NULL; | |
161ce7ce BB |
714 | blkptr_t *bp_toread; |
715 | ||
20a083cb | 716 | bp_toread = kmem_alloc(sizeof (blkptr_t), KM_PUSHPAGE); |
161ce7ce | 717 | *bp_toread = *bp; |
428870ff BB |
718 | |
719 | /* ASSERT(pbuf == NULL || arc_released(pbuf)); */ | |
720 | ||
721 | if (dsl_scan_check_pause(scn, zb)) | |
161ce7ce | 722 | goto out; |
428870ff BB |
723 | |
724 | if (dsl_scan_check_resume(scn, dnp, zb)) | |
161ce7ce | 725 | goto out; |
428870ff BB |
726 | |
727 | if (bp->blk_birth == 0) | |
161ce7ce | 728 | goto out; |
428870ff BB |
729 | |
730 | scn->scn_visited_this_txg++; | |
731 | ||
b81c4ac9 BB |
732 | /* |
733 | * This debugging is commented out to conserve stack space. This | |
734 | * function is called recursively and the debugging addes several | |
735 | * bytes to the stack for each call. It can be commented back in | |
736 | * if required to debug an issue in dsl_scan_visitbp(). | |
737 | * | |
738 | * dprintf_bp(bp, | |
739 | * "visiting ds=%p/%llu zb=%llx/%llx/%llx/%llx buf=%p bp=%p", | |
740 | * ds, ds ? ds->ds_object : 0, | |
741 | * zb->zb_objset, zb->zb_object, zb->zb_level, zb->zb_blkid, | |
742 | * pbuf, bp); | |
743 | */ | |
428870ff BB |
744 | |
745 | if (bp->blk_birth <= scn->scn_phys.scn_cur_min_txg) | |
161ce7ce | 746 | goto out; |
428870ff | 747 | |
161ce7ce | 748 | if (dsl_scan_recurse(scn, ds, ostype, dnp, bp_toread, zb, tx, |
428870ff | 749 | &buf) != 0) |
161ce7ce | 750 | goto out; |
428870ff BB |
751 | |
752 | /* | |
753 | * If dsl_scan_ddt() has aready visited this block, it will have | |
754 | * already done any translations or scrubbing, so don't call the | |
755 | * callback again. | |
756 | */ | |
757 | if (ddt_class_contains(dp->dp_spa, | |
758 | scn->scn_phys.scn_ddt_class_max, bp)) { | |
759 | ASSERT(buf == NULL); | |
161ce7ce | 760 | goto out; |
428870ff BB |
761 | } |
762 | ||
763 | /* | |
764 | * If this block is from the future (after cur_max_txg), then we | |
765 | * are doing this on behalf of a deleted snapshot, and we will | |
766 | * revisit the future block on the next pass of this dataset. | |
767 | * Don't scan it now unless we need to because something | |
768 | * under it was modified. | |
769 | */ | |
770 | if (bp->blk_birth <= scn->scn_phys.scn_cur_max_txg) { | |
771 | scan_funcs[scn->scn_phys.scn_func](dp, bp, zb); | |
772 | } | |
773 | if (buf) | |
774 | (void) arc_buf_remove_ref(buf, &buf); | |
161ce7ce BB |
775 | out: |
776 | kmem_free(bp_toread, sizeof(blkptr_t)); | |
428870ff BB |
777 | } |
778 | ||
779 | static void | |
780 | dsl_scan_visit_rootbp(dsl_scan_t *scn, dsl_dataset_t *ds, blkptr_t *bp, | |
781 | dmu_tx_t *tx) | |
782 | { | |
783 | zbookmark_t zb; | |
784 | ||
785 | SET_BOOKMARK(&zb, ds ? ds->ds_object : DMU_META_OBJSET, | |
786 | ZB_ROOT_OBJECT, ZB_ROOT_LEVEL, ZB_ROOT_BLKID); | |
787 | dsl_scan_visitbp(bp, &zb, NULL, NULL, | |
788 | ds, scn, DMU_OST_NONE, tx); | |
789 | ||
790 | dprintf_ds(ds, "finished scan%s", ""); | |
791 | } | |
792 | ||
793 | void | |
794 | dsl_scan_ds_destroyed(dsl_dataset_t *ds, dmu_tx_t *tx) | |
795 | { | |
796 | dsl_pool_t *dp = ds->ds_dir->dd_pool; | |
797 | dsl_scan_t *scn = dp->dp_scan; | |
798 | uint64_t mintxg; | |
799 | ||
800 | if (scn->scn_phys.scn_state != DSS_SCANNING) | |
801 | return; | |
802 | ||
803 | if (scn->scn_phys.scn_bookmark.zb_objset == ds->ds_object) { | |
804 | if (dsl_dataset_is_snapshot(ds)) { | |
805 | /* Note, scn_cur_{min,max}_txg stays the same. */ | |
806 | scn->scn_phys.scn_bookmark.zb_objset = | |
807 | ds->ds_phys->ds_next_snap_obj; | |
808 | zfs_dbgmsg("destroying ds %llu; currently traversing; " | |
809 | "reset zb_objset to %llu", | |
810 | (u_longlong_t)ds->ds_object, | |
811 | (u_longlong_t)ds->ds_phys->ds_next_snap_obj); | |
812 | scn->scn_phys.scn_flags |= DSF_VISIT_DS_AGAIN; | |
813 | } else { | |
814 | SET_BOOKMARK(&scn->scn_phys.scn_bookmark, | |
815 | ZB_DESTROYED_OBJSET, 0, 0, 0); | |
816 | zfs_dbgmsg("destroying ds %llu; currently traversing; " | |
817 | "reset bookmark to -1,0,0,0", | |
818 | (u_longlong_t)ds->ds_object); | |
819 | } | |
820 | } else if (zap_lookup_int_key(dp->dp_meta_objset, | |
821 | scn->scn_phys.scn_queue_obj, ds->ds_object, &mintxg) == 0) { | |
822 | ASSERT3U(ds->ds_phys->ds_num_children, <=, 1); | |
823 | VERIFY3U(0, ==, zap_remove_int(dp->dp_meta_objset, | |
824 | scn->scn_phys.scn_queue_obj, ds->ds_object, tx)); | |
825 | if (dsl_dataset_is_snapshot(ds)) { | |
826 | /* | |
827 | * We keep the same mintxg; it could be > | |
828 | * ds_creation_txg if the previous snapshot was | |
829 | * deleted too. | |
830 | */ | |
831 | VERIFY(zap_add_int_key(dp->dp_meta_objset, | |
832 | scn->scn_phys.scn_queue_obj, | |
833 | ds->ds_phys->ds_next_snap_obj, mintxg, tx) == 0); | |
834 | zfs_dbgmsg("destroying ds %llu; in queue; " | |
835 | "replacing with %llu", | |
836 | (u_longlong_t)ds->ds_object, | |
837 | (u_longlong_t)ds->ds_phys->ds_next_snap_obj); | |
838 | } else { | |
839 | zfs_dbgmsg("destroying ds %llu; in queue; removing", | |
840 | (u_longlong_t)ds->ds_object); | |
841 | } | |
842 | } else { | |
843 | zfs_dbgmsg("destroying ds %llu; ignoring", | |
844 | (u_longlong_t)ds->ds_object); | |
845 | } | |
846 | ||
847 | /* | |
848 | * dsl_scan_sync() should be called after this, and should sync | |
849 | * out our changed state, but just to be safe, do it here. | |
850 | */ | |
851 | dsl_scan_sync_state(scn, tx); | |
852 | } | |
853 | ||
854 | void | |
855 | dsl_scan_ds_snapshotted(dsl_dataset_t *ds, dmu_tx_t *tx) | |
856 | { | |
857 | dsl_pool_t *dp = ds->ds_dir->dd_pool; | |
858 | dsl_scan_t *scn = dp->dp_scan; | |
859 | uint64_t mintxg; | |
860 | ||
861 | if (scn->scn_phys.scn_state != DSS_SCANNING) | |
862 | return; | |
863 | ||
864 | ASSERT(ds->ds_phys->ds_prev_snap_obj != 0); | |
865 | ||
866 | if (scn->scn_phys.scn_bookmark.zb_objset == ds->ds_object) { | |
867 | scn->scn_phys.scn_bookmark.zb_objset = | |
868 | ds->ds_phys->ds_prev_snap_obj; | |
869 | zfs_dbgmsg("snapshotting ds %llu; currently traversing; " | |
870 | "reset zb_objset to %llu", | |
871 | (u_longlong_t)ds->ds_object, | |
872 | (u_longlong_t)ds->ds_phys->ds_prev_snap_obj); | |
873 | } else if (zap_lookup_int_key(dp->dp_meta_objset, | |
874 | scn->scn_phys.scn_queue_obj, ds->ds_object, &mintxg) == 0) { | |
875 | VERIFY3U(0, ==, zap_remove_int(dp->dp_meta_objset, | |
876 | scn->scn_phys.scn_queue_obj, ds->ds_object, tx)); | |
877 | VERIFY(zap_add_int_key(dp->dp_meta_objset, | |
878 | scn->scn_phys.scn_queue_obj, | |
879 | ds->ds_phys->ds_prev_snap_obj, mintxg, tx) == 0); | |
880 | zfs_dbgmsg("snapshotting ds %llu; in queue; " | |
881 | "replacing with %llu", | |
882 | (u_longlong_t)ds->ds_object, | |
883 | (u_longlong_t)ds->ds_phys->ds_prev_snap_obj); | |
884 | } | |
885 | dsl_scan_sync_state(scn, tx); | |
886 | } | |
887 | ||
888 | void | |
889 | dsl_scan_ds_clone_swapped(dsl_dataset_t *ds1, dsl_dataset_t *ds2, dmu_tx_t *tx) | |
890 | { | |
891 | dsl_pool_t *dp = ds1->ds_dir->dd_pool; | |
892 | dsl_scan_t *scn = dp->dp_scan; | |
893 | uint64_t mintxg; | |
894 | ||
895 | if (scn->scn_phys.scn_state != DSS_SCANNING) | |
896 | return; | |
897 | ||
898 | if (scn->scn_phys.scn_bookmark.zb_objset == ds1->ds_object) { | |
899 | scn->scn_phys.scn_bookmark.zb_objset = ds2->ds_object; | |
900 | zfs_dbgmsg("clone_swap ds %llu; currently traversing; " | |
901 | "reset zb_objset to %llu", | |
902 | (u_longlong_t)ds1->ds_object, | |
903 | (u_longlong_t)ds2->ds_object); | |
904 | } else if (scn->scn_phys.scn_bookmark.zb_objset == ds2->ds_object) { | |
905 | scn->scn_phys.scn_bookmark.zb_objset = ds1->ds_object; | |
906 | zfs_dbgmsg("clone_swap ds %llu; currently traversing; " | |
907 | "reset zb_objset to %llu", | |
908 | (u_longlong_t)ds2->ds_object, | |
909 | (u_longlong_t)ds1->ds_object); | |
910 | } | |
911 | ||
912 | if (zap_lookup_int_key(dp->dp_meta_objset, scn->scn_phys.scn_queue_obj, | |
913 | ds1->ds_object, &mintxg) == 0) { | |
914 | int err; | |
915 | ||
916 | ASSERT3U(mintxg, ==, ds1->ds_phys->ds_prev_snap_txg); | |
917 | ASSERT3U(mintxg, ==, ds2->ds_phys->ds_prev_snap_txg); | |
918 | VERIFY3U(0, ==, zap_remove_int(dp->dp_meta_objset, | |
919 | scn->scn_phys.scn_queue_obj, ds1->ds_object, tx)); | |
920 | err = zap_add_int_key(dp->dp_meta_objset, | |
921 | scn->scn_phys.scn_queue_obj, ds2->ds_object, mintxg, tx); | |
922 | VERIFY(err == 0 || err == EEXIST); | |
923 | if (err == EEXIST) { | |
924 | /* Both were there to begin with */ | |
925 | VERIFY(0 == zap_add_int_key(dp->dp_meta_objset, | |
926 | scn->scn_phys.scn_queue_obj, | |
927 | ds1->ds_object, mintxg, tx)); | |
928 | } | |
929 | zfs_dbgmsg("clone_swap ds %llu; in queue; " | |
930 | "replacing with %llu", | |
931 | (u_longlong_t)ds1->ds_object, | |
932 | (u_longlong_t)ds2->ds_object); | |
933 | } else if (zap_lookup_int_key(dp->dp_meta_objset, | |
934 | scn->scn_phys.scn_queue_obj, ds2->ds_object, &mintxg) == 0) { | |
935 | ASSERT3U(mintxg, ==, ds1->ds_phys->ds_prev_snap_txg); | |
936 | ASSERT3U(mintxg, ==, ds2->ds_phys->ds_prev_snap_txg); | |
937 | VERIFY3U(0, ==, zap_remove_int(dp->dp_meta_objset, | |
938 | scn->scn_phys.scn_queue_obj, ds2->ds_object, tx)); | |
939 | VERIFY(0 == zap_add_int_key(dp->dp_meta_objset, | |
940 | scn->scn_phys.scn_queue_obj, ds1->ds_object, mintxg, tx)); | |
941 | zfs_dbgmsg("clone_swap ds %llu; in queue; " | |
942 | "replacing with %llu", | |
943 | (u_longlong_t)ds2->ds_object, | |
944 | (u_longlong_t)ds1->ds_object); | |
945 | } | |
946 | ||
947 | dsl_scan_sync_state(scn, tx); | |
948 | } | |
949 | ||
950 | struct enqueue_clones_arg { | |
951 | dmu_tx_t *tx; | |
952 | uint64_t originobj; | |
953 | }; | |
954 | ||
955 | /* ARGSUSED */ | |
956 | static int | |
13fe0198 | 957 | enqueue_clones_cb(dsl_pool_t *dp, dsl_dataset_t *hds, void *arg) |
428870ff BB |
958 | { |
959 | struct enqueue_clones_arg *eca = arg; | |
960 | dsl_dataset_t *ds; | |
961 | int err; | |
428870ff BB |
962 | dsl_scan_t *scn = dp->dp_scan; |
963 | ||
13fe0198 MA |
964 | if (hds->ds_dir->dd_phys->dd_origin_obj != eca->originobj) |
965 | return (0); | |
966 | ||
967 | err = dsl_dataset_hold_obj(dp, hds->ds_object, FTAG, &ds); | |
428870ff BB |
968 | if (err) |
969 | return (err); | |
970 | ||
13fe0198 MA |
971 | while (ds->ds_phys->ds_prev_snap_obj != eca->originobj) { |
972 | dsl_dataset_t *prev; | |
973 | err = dsl_dataset_hold_obj(dp, | |
974 | ds->ds_phys->ds_prev_snap_obj, FTAG, &prev); | |
428870ff | 975 | |
13fe0198 MA |
976 | dsl_dataset_rele(ds, FTAG); |
977 | if (err) | |
978 | return (err); | |
979 | ds = prev; | |
428870ff | 980 | } |
13fe0198 MA |
981 | VERIFY(zap_add_int_key(dp->dp_meta_objset, |
982 | scn->scn_phys.scn_queue_obj, ds->ds_object, | |
983 | ds->ds_phys->ds_prev_snap_txg, eca->tx) == 0); | |
428870ff BB |
984 | dsl_dataset_rele(ds, FTAG); |
985 | return (0); | |
986 | } | |
987 | ||
988 | static void | |
989 | dsl_scan_visitds(dsl_scan_t *scn, uint64_t dsobj, dmu_tx_t *tx) | |
990 | { | |
991 | dsl_pool_t *dp = scn->scn_dp; | |
992 | dsl_dataset_t *ds; | |
572e2857 | 993 | objset_t *os; |
d6320ddb | 994 | char *dsname; |
428870ff BB |
995 | |
996 | VERIFY3U(0, ==, dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds)); | |
997 | ||
572e2857 BB |
998 | if (dmu_objset_from_ds(ds, &os)) |
999 | goto out; | |
1000 | ||
1001 | /* | |
1002 | * Only the ZIL in the head (non-snapshot) is valid. Even though | |
1003 | * snapshots can have ZIL block pointers (which may be the same | |
1004 | * BP as in the head), they must be ignored. So we traverse the | |
1005 | * ZIL here, rather than in scan_recurse(), because the regular | |
1006 | * snapshot block-sharing rules don't apply to it. | |
1007 | */ | |
1008 | if (DSL_SCAN_IS_SCRUB_RESILVER(scn) && !dsl_dataset_is_snapshot(ds)) | |
1009 | dsl_scan_zil(dp, &os->os_zil_header); | |
1010 | ||
428870ff BB |
1011 | /* |
1012 | * Iterate over the bps in this ds. | |
1013 | */ | |
1014 | dmu_buf_will_dirty(ds->ds_dbuf, tx); | |
1015 | dsl_scan_visit_rootbp(scn, ds, &ds->ds_phys->ds_bp, tx); | |
1016 | ||
20a083cb | 1017 | dsname = kmem_alloc(ZFS_MAXNAMELEN, KM_PUSHPAGE); |
428870ff BB |
1018 | dsl_dataset_name(ds, dsname); |
1019 | zfs_dbgmsg("scanned dataset %llu (%s) with min=%llu max=%llu; " | |
1020 | "pausing=%u", | |
1021 | (longlong_t)dsobj, dsname, | |
1022 | (longlong_t)scn->scn_phys.scn_cur_min_txg, | |
1023 | (longlong_t)scn->scn_phys.scn_cur_max_txg, | |
1024 | (int)scn->scn_pausing); | |
1025 | kmem_free(dsname, ZFS_MAXNAMELEN); | |
1026 | ||
1027 | if (scn->scn_pausing) | |
1028 | goto out; | |
1029 | ||
1030 | /* | |
1031 | * We've finished this pass over this dataset. | |
1032 | */ | |
1033 | ||
1034 | /* | |
1035 | * If we did not completely visit this dataset, do another pass. | |
1036 | */ | |
1037 | if (scn->scn_phys.scn_flags & DSF_VISIT_DS_AGAIN) { | |
1038 | zfs_dbgmsg("incomplete pass; visiting again"); | |
1039 | scn->scn_phys.scn_flags &= ~DSF_VISIT_DS_AGAIN; | |
1040 | VERIFY(zap_add_int_key(dp->dp_meta_objset, | |
1041 | scn->scn_phys.scn_queue_obj, ds->ds_object, | |
1042 | scn->scn_phys.scn_cur_max_txg, tx) == 0); | |
1043 | goto out; | |
1044 | } | |
1045 | ||
1046 | /* | |
1047 | * Add descendent datasets to work queue. | |
1048 | */ | |
1049 | if (ds->ds_phys->ds_next_snap_obj != 0) { | |
1050 | VERIFY(zap_add_int_key(dp->dp_meta_objset, | |
1051 | scn->scn_phys.scn_queue_obj, ds->ds_phys->ds_next_snap_obj, | |
1052 | ds->ds_phys->ds_creation_txg, tx) == 0); | |
1053 | } | |
1054 | if (ds->ds_phys->ds_num_children > 1) { | |
1055 | boolean_t usenext = B_FALSE; | |
1056 | if (ds->ds_phys->ds_next_clones_obj != 0) { | |
1057 | uint64_t count; | |
1058 | /* | |
1059 | * A bug in a previous version of the code could | |
1060 | * cause upgrade_clones_cb() to not set | |
1061 | * ds_next_snap_obj when it should, leading to a | |
1062 | * missing entry. Therefore we can only use the | |
1063 | * next_clones_obj when its count is correct. | |
1064 | */ | |
1065 | int err = zap_count(dp->dp_meta_objset, | |
1066 | ds->ds_phys->ds_next_clones_obj, &count); | |
1067 | if (err == 0 && | |
1068 | count == ds->ds_phys->ds_num_children - 1) | |
1069 | usenext = B_TRUE; | |
1070 | } | |
1071 | ||
1072 | if (usenext) { | |
13fe0198 | 1073 | VERIFY0(zap_join_key(dp->dp_meta_objset, |
428870ff BB |
1074 | ds->ds_phys->ds_next_clones_obj, |
1075 | scn->scn_phys.scn_queue_obj, | |
13fe0198 | 1076 | ds->ds_phys->ds_creation_txg, tx)); |
428870ff BB |
1077 | } else { |
1078 | struct enqueue_clones_arg eca; | |
1079 | eca.tx = tx; | |
1080 | eca.originobj = ds->ds_object; | |
1081 | ||
13fe0198 MA |
1082 | VERIFY0(dmu_objset_find_dp(dp, dp->dp_root_dir_obj, |
1083 | enqueue_clones_cb, &eca, DS_FIND_CHILDREN)); | |
428870ff BB |
1084 | } |
1085 | } | |
1086 | ||
1087 | out: | |
1088 | dsl_dataset_rele(ds, FTAG); | |
1089 | } | |
1090 | ||
1091 | /* ARGSUSED */ | |
1092 | static int | |
13fe0198 | 1093 | enqueue_cb(dsl_pool_t *dp, dsl_dataset_t *hds, void *arg) |
428870ff BB |
1094 | { |
1095 | dmu_tx_t *tx = arg; | |
1096 | dsl_dataset_t *ds; | |
1097 | int err; | |
428870ff BB |
1098 | dsl_scan_t *scn = dp->dp_scan; |
1099 | ||
13fe0198 | 1100 | err = dsl_dataset_hold_obj(dp, hds->ds_object, FTAG, &ds); |
428870ff BB |
1101 | if (err) |
1102 | return (err); | |
1103 | ||
1104 | while (ds->ds_phys->ds_prev_snap_obj != 0) { | |
1105 | dsl_dataset_t *prev; | |
1106 | err = dsl_dataset_hold_obj(dp, ds->ds_phys->ds_prev_snap_obj, | |
1107 | FTAG, &prev); | |
1108 | if (err) { | |
1109 | dsl_dataset_rele(ds, FTAG); | |
1110 | return (err); | |
1111 | } | |
1112 | ||
1113 | /* | |
1114 | * If this is a clone, we don't need to worry about it for now. | |
1115 | */ | |
1116 | if (prev->ds_phys->ds_next_snap_obj != ds->ds_object) { | |
1117 | dsl_dataset_rele(ds, FTAG); | |
1118 | dsl_dataset_rele(prev, FTAG); | |
1119 | return (0); | |
1120 | } | |
1121 | dsl_dataset_rele(ds, FTAG); | |
1122 | ds = prev; | |
1123 | } | |
1124 | ||
1125 | VERIFY(zap_add_int_key(dp->dp_meta_objset, scn->scn_phys.scn_queue_obj, | |
1126 | ds->ds_object, ds->ds_phys->ds_prev_snap_txg, tx) == 0); | |
1127 | dsl_dataset_rele(ds, FTAG); | |
1128 | return (0); | |
1129 | } | |
1130 | ||
1131 | /* | |
1132 | * Scrub/dedup interaction. | |
1133 | * | |
1134 | * If there are N references to a deduped block, we don't want to scrub it | |
1135 | * N times -- ideally, we should scrub it exactly once. | |
1136 | * | |
1137 | * We leverage the fact that the dde's replication class (enum ddt_class) | |
1138 | * is ordered from highest replication class (DDT_CLASS_DITTO) to lowest | |
1139 | * (DDT_CLASS_UNIQUE) so that we may walk the DDT in that order. | |
1140 | * | |
1141 | * To prevent excess scrubbing, the scrub begins by walking the DDT | |
1142 | * to find all blocks with refcnt > 1, and scrubs each of these once. | |
1143 | * Since there are two replication classes which contain blocks with | |
1144 | * refcnt > 1, we scrub the highest replication class (DDT_CLASS_DITTO) first. | |
1145 | * Finally the top-down scrub begins, only visiting blocks with refcnt == 1. | |
1146 | * | |
1147 | * There would be nothing more to say if a block's refcnt couldn't change | |
1148 | * during a scrub, but of course it can so we must account for changes | |
1149 | * in a block's replication class. | |
1150 | * | |
1151 | * Here's an example of what can occur: | |
1152 | * | |
1153 | * If a block has refcnt > 1 during the DDT scrub phase, but has refcnt == 1 | |
1154 | * when visited during the top-down scrub phase, it will be scrubbed twice. | |
1155 | * This negates our scrub optimization, but is otherwise harmless. | |
1156 | * | |
1157 | * If a block has refcnt == 1 during the DDT scrub phase, but has refcnt > 1 | |
1158 | * on each visit during the top-down scrub phase, it will never be scrubbed. | |
1159 | * To catch this, ddt_sync_entry() notifies the scrub code whenever a block's | |
1160 | * reference class transitions to a higher level (i.e DDT_CLASS_UNIQUE to | |
1161 | * DDT_CLASS_DUPLICATE); if it transitions from refcnt == 1 to refcnt > 1 | |
1162 | * while a scrub is in progress, it scrubs the block right then. | |
1163 | */ | |
1164 | static void | |
1165 | dsl_scan_ddt(dsl_scan_t *scn, dmu_tx_t *tx) | |
1166 | { | |
1167 | ddt_bookmark_t *ddb = &scn->scn_phys.scn_ddt_bookmark; | |
2598c001 | 1168 | ddt_entry_t dde; |
428870ff BB |
1169 | int error; |
1170 | uint64_t n = 0; | |
1171 | ||
2598c001 BB |
1172 | bzero(&dde, sizeof (ddt_entry_t)); |
1173 | ||
428870ff BB |
1174 | while ((error = ddt_walk(scn->scn_dp->dp_spa, ddb, &dde)) == 0) { |
1175 | ddt_t *ddt; | |
1176 | ||
1177 | if (ddb->ddb_class > scn->scn_phys.scn_ddt_class_max) | |
1178 | break; | |
1179 | dprintf("visiting ddb=%llu/%llu/%llu/%llx\n", | |
1180 | (longlong_t)ddb->ddb_class, | |
1181 | (longlong_t)ddb->ddb_type, | |
1182 | (longlong_t)ddb->ddb_checksum, | |
1183 | (longlong_t)ddb->ddb_cursor); | |
1184 | ||
1185 | /* There should be no pending changes to the dedup table */ | |
1186 | ddt = scn->scn_dp->dp_spa->spa_ddt[ddb->ddb_checksum]; | |
1187 | ASSERT(avl_first(&ddt->ddt_tree) == NULL); | |
1188 | ||
1189 | dsl_scan_ddt_entry(scn, ddb->ddb_checksum, &dde, tx); | |
1190 | n++; | |
1191 | ||
1192 | if (dsl_scan_check_pause(scn, NULL)) | |
1193 | break; | |
1194 | } | |
1195 | ||
1196 | zfs_dbgmsg("scanned %llu ddt entries with class_max = %u; pausing=%u", | |
1197 | (longlong_t)n, (int)scn->scn_phys.scn_ddt_class_max, | |
1198 | (int)scn->scn_pausing); | |
1199 | ||
1200 | ASSERT(error == 0 || error == ENOENT); | |
1201 | ASSERT(error != ENOENT || | |
1202 | ddb->ddb_class > scn->scn_phys.scn_ddt_class_max); | |
1203 | } | |
1204 | ||
1205 | /* ARGSUSED */ | |
1206 | void | |
1207 | dsl_scan_ddt_entry(dsl_scan_t *scn, enum zio_checksum checksum, | |
1208 | ddt_entry_t *dde, dmu_tx_t *tx) | |
1209 | { | |
1210 | const ddt_key_t *ddk = &dde->dde_key; | |
1211 | ddt_phys_t *ddp = dde->dde_phys; | |
1212 | blkptr_t bp; | |
1213 | zbookmark_t zb = { 0 }; | |
d6320ddb | 1214 | int p; |
428870ff BB |
1215 | |
1216 | if (scn->scn_phys.scn_state != DSS_SCANNING) | |
1217 | return; | |
1218 | ||
d6320ddb | 1219 | for (p = 0; p < DDT_PHYS_TYPES; p++, ddp++) { |
428870ff BB |
1220 | if (ddp->ddp_phys_birth == 0 || |
1221 | ddp->ddp_phys_birth > scn->scn_phys.scn_cur_max_txg) | |
1222 | continue; | |
1223 | ddt_bp_create(checksum, ddk, ddp, &bp); | |
1224 | ||
1225 | scn->scn_visited_this_txg++; | |
1226 | scan_funcs[scn->scn_phys.scn_func](scn->scn_dp, &bp, &zb); | |
1227 | } | |
1228 | } | |
1229 | ||
1230 | static void | |
1231 | dsl_scan_visit(dsl_scan_t *scn, dmu_tx_t *tx) | |
1232 | { | |
1233 | dsl_pool_t *dp = scn->scn_dp; | |
40a39e11 BB |
1234 | zap_cursor_t *zc; |
1235 | zap_attribute_t *za; | |
428870ff BB |
1236 | |
1237 | if (scn->scn_phys.scn_ddt_bookmark.ddb_class <= | |
1238 | scn->scn_phys.scn_ddt_class_max) { | |
1239 | scn->scn_phys.scn_cur_min_txg = scn->scn_phys.scn_min_txg; | |
1240 | scn->scn_phys.scn_cur_max_txg = scn->scn_phys.scn_max_txg; | |
1241 | dsl_scan_ddt(scn, tx); | |
1242 | if (scn->scn_pausing) | |
1243 | return; | |
1244 | } | |
1245 | ||
1246 | if (scn->scn_phys.scn_bookmark.zb_objset == DMU_META_OBJSET) { | |
1247 | /* First do the MOS & ORIGIN */ | |
1248 | ||
1249 | scn->scn_phys.scn_cur_min_txg = scn->scn_phys.scn_min_txg; | |
1250 | scn->scn_phys.scn_cur_max_txg = scn->scn_phys.scn_max_txg; | |
1251 | dsl_scan_visit_rootbp(scn, NULL, | |
1252 | &dp->dp_meta_rootbp, tx); | |
1253 | spa_set_rootblkptr(dp->dp_spa, &dp->dp_meta_rootbp); | |
1254 | if (scn->scn_pausing) | |
1255 | return; | |
1256 | ||
1257 | if (spa_version(dp->dp_spa) < SPA_VERSION_DSL_SCRUB) { | |
13fe0198 MA |
1258 | VERIFY0(dmu_objset_find_dp(dp, dp->dp_root_dir_obj, |
1259 | enqueue_cb, tx, DS_FIND_CHILDREN)); | |
428870ff BB |
1260 | } else { |
1261 | dsl_scan_visitds(scn, | |
1262 | dp->dp_origin_snap->ds_object, tx); | |
1263 | } | |
1264 | ASSERT(!scn->scn_pausing); | |
1265 | } else if (scn->scn_phys.scn_bookmark.zb_objset != | |
1266 | ZB_DESTROYED_OBJSET) { | |
1267 | /* | |
1268 | * If we were paused, continue from here. Note if the | |
1269 | * ds we were paused on was deleted, the zb_objset may | |
1270 | * be -1, so we will skip this and find a new objset | |
1271 | * below. | |
1272 | */ | |
1273 | dsl_scan_visitds(scn, scn->scn_phys.scn_bookmark.zb_objset, tx); | |
1274 | if (scn->scn_pausing) | |
1275 | return; | |
1276 | } | |
1277 | ||
1278 | /* | |
1279 | * In case we were paused right at the end of the ds, zero the | |
1280 | * bookmark so we don't think that we're still trying to resume. | |
1281 | */ | |
1282 | bzero(&scn->scn_phys.scn_bookmark, sizeof (zbookmark_t)); | |
20a083cb CD |
1283 | zc = kmem_alloc(sizeof(zap_cursor_t), KM_PUSHPAGE); |
1284 | za = kmem_alloc(sizeof(zap_attribute_t), KM_PUSHPAGE); | |
428870ff BB |
1285 | |
1286 | /* keep pulling things out of the zap-object-as-queue */ | |
40a39e11 | 1287 | while (zap_cursor_init(zc, dp->dp_meta_objset, |
428870ff | 1288 | scn->scn_phys.scn_queue_obj), |
40a39e11 | 1289 | zap_cursor_retrieve(zc, za) == 0) { |
428870ff BB |
1290 | dsl_dataset_t *ds; |
1291 | uint64_t dsobj; | |
1292 | ||
40a39e11 | 1293 | dsobj = strtonum(za->za_name, NULL); |
428870ff BB |
1294 | VERIFY3U(0, ==, zap_remove_int(dp->dp_meta_objset, |
1295 | scn->scn_phys.scn_queue_obj, dsobj, tx)); | |
1296 | ||
1297 | /* Set up min/max txg */ | |
1298 | VERIFY3U(0, ==, dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds)); | |
40a39e11 | 1299 | if (za->za_first_integer != 0) { |
428870ff BB |
1300 | scn->scn_phys.scn_cur_min_txg = |
1301 | MAX(scn->scn_phys.scn_min_txg, | |
40a39e11 | 1302 | za->za_first_integer); |
428870ff BB |
1303 | } else { |
1304 | scn->scn_phys.scn_cur_min_txg = | |
1305 | MAX(scn->scn_phys.scn_min_txg, | |
1306 | ds->ds_phys->ds_prev_snap_txg); | |
1307 | } | |
1308 | scn->scn_phys.scn_cur_max_txg = dsl_scan_ds_maxtxg(ds); | |
1309 | dsl_dataset_rele(ds, FTAG); | |
1310 | ||
1311 | dsl_scan_visitds(scn, dsobj, tx); | |
40a39e11 | 1312 | zap_cursor_fini(zc); |
428870ff | 1313 | if (scn->scn_pausing) |
40a39e11 | 1314 | goto out; |
428870ff | 1315 | } |
40a39e11 BB |
1316 | zap_cursor_fini(zc); |
1317 | out: | |
1318 | kmem_free(za, sizeof(zap_attribute_t)); | |
1319 | kmem_free(zc, sizeof(zap_cursor_t)); | |
428870ff BB |
1320 | } |
1321 | ||
9ae529ec CS |
1322 | static boolean_t |
1323 | dsl_scan_free_should_pause(dsl_scan_t *scn) | |
428870ff | 1324 | { |
428870ff BB |
1325 | uint64_t elapsed_nanosecs; |
1326 | ||
1327 | elapsed_nanosecs = gethrtime() - scn->scn_sync_start_time; | |
9ae529ec | 1328 | return (elapsed_nanosecs / NANOSEC > zfs_txg_timeout || |
428870ff BB |
1329 | (elapsed_nanosecs / MICROSEC > zfs_free_min_time_ms && |
1330 | txg_sync_waiting(scn->scn_dp)) || | |
9ae529ec CS |
1331 | spa_shutting_down(scn->scn_dp->dp_spa)); |
1332 | } | |
1333 | ||
1334 | static int | |
1335 | dsl_scan_free_block_cb(void *arg, const blkptr_t *bp, dmu_tx_t *tx) | |
1336 | { | |
1337 | dsl_scan_t *scn = arg; | |
1338 | ||
1339 | if (!scn->scn_is_bptree || | |
1340 | (BP_GET_LEVEL(bp) == 0 && BP_GET_TYPE(bp) != DMU_OT_OBJSET)) { | |
1341 | if (dsl_scan_free_should_pause(scn)) | |
1342 | return (ERESTART); | |
1343 | } | |
428870ff BB |
1344 | |
1345 | zio_nowait(zio_free_sync(scn->scn_zio_root, scn->scn_dp->dp_spa, | |
1346 | dmu_tx_get_txg(tx), bp, 0)); | |
1347 | dsl_dir_diduse_space(tx->tx_pool->dp_free_dir, DD_USED_HEAD, | |
1348 | -bp_get_dsize_sync(scn->scn_dp->dp_spa, bp), | |
1349 | -BP_GET_PSIZE(bp), -BP_GET_UCSIZE(bp), tx); | |
1350 | scn->scn_visited_this_txg++; | |
1351 | return (0); | |
1352 | } | |
1353 | ||
1354 | boolean_t | |
1355 | dsl_scan_active(dsl_scan_t *scn) | |
1356 | { | |
1357 | spa_t *spa = scn->scn_dp->dp_spa; | |
1358 | uint64_t used = 0, comp, uncomp; | |
1359 | ||
1360 | if (spa->spa_load_state != SPA_LOAD_NONE) | |
1361 | return (B_FALSE); | |
1362 | if (spa_shutting_down(spa)) | |
1363 | return (B_FALSE); | |
1364 | ||
1365 | if (scn->scn_phys.scn_state == DSS_SCANNING) | |
1366 | return (B_TRUE); | |
1367 | ||
9ae529ec CS |
1368 | if (spa_feature_is_active(spa, |
1369 | &spa_feature_table[SPA_FEATURE_ASYNC_DESTROY])) { | |
1370 | return (B_TRUE); | |
1371 | } | |
428870ff BB |
1372 | if (spa_version(scn->scn_dp->dp_spa) >= SPA_VERSION_DEADLISTS) { |
1373 | (void) bpobj_space(&scn->scn_dp->dp_free_bpobj, | |
1374 | &used, &comp, &uncomp); | |
1375 | } | |
1376 | return (used != 0); | |
1377 | } | |
1378 | ||
1379 | void | |
1380 | dsl_scan_sync(dsl_pool_t *dp, dmu_tx_t *tx) | |
1381 | { | |
1382 | dsl_scan_t *scn = dp->dp_scan; | |
1383 | spa_t *spa = dp->dp_spa; | |
1384 | int err; | |
1385 | ||
1386 | /* | |
1387 | * Check for scn_restart_txg before checking spa_load_state, so | |
1388 | * that we can restart an old-style scan while the pool is being | |
1389 | * imported (see dsl_scan_init). | |
1390 | */ | |
1391 | if (scn->scn_restart_txg != 0 && | |
1392 | scn->scn_restart_txg <= tx->tx_txg) { | |
1393 | pool_scan_func_t func = POOL_SCAN_SCRUB; | |
1394 | dsl_scan_done(scn, B_FALSE, tx); | |
1395 | if (vdev_resilver_needed(spa->spa_root_vdev, NULL, NULL)) | |
1396 | func = POOL_SCAN_RESILVER; | |
1397 | zfs_dbgmsg("restarting scan func=%u txg=%llu", | |
1398 | func, tx->tx_txg); | |
13fe0198 | 1399 | dsl_scan_setup_sync(&func, tx); |
428870ff BB |
1400 | } |
1401 | ||
428870ff BB |
1402 | if (!dsl_scan_active(scn) || |
1403 | spa_sync_pass(dp->dp_spa) > 1) | |
1404 | return; | |
1405 | ||
1406 | scn->scn_visited_this_txg = 0; | |
1407 | scn->scn_pausing = B_FALSE; | |
1408 | scn->scn_sync_start_time = gethrtime(); | |
1409 | spa->spa_scrub_active = B_TRUE; | |
1410 | ||
1411 | /* | |
1412 | * First process the free list. If we pause the free, don't do | |
1413 | * any scanning. This ensures that there is no free list when | |
1414 | * we are scanning, so the scan code doesn't have to worry about | |
1415 | * traversing it. | |
1416 | */ | |
1417 | if (spa_version(dp->dp_spa) >= SPA_VERSION_DEADLISTS) { | |
9ae529ec | 1418 | scn->scn_is_bptree = B_FALSE; |
428870ff BB |
1419 | scn->scn_zio_root = zio_root(dp->dp_spa, NULL, |
1420 | NULL, ZIO_FLAG_MUSTSUCCEED); | |
1421 | err = bpobj_iterate(&dp->dp_free_bpobj, | |
9ae529ec | 1422 | dsl_scan_free_block_cb, scn, tx); |
428870ff | 1423 | VERIFY3U(0, ==, zio_wait(scn->scn_zio_root)); |
9ae529ec CS |
1424 | |
1425 | if (err == 0 && spa_feature_is_active(spa, | |
1426 | &spa_feature_table[SPA_FEATURE_ASYNC_DESTROY])) { | |
1427 | scn->scn_is_bptree = B_TRUE; | |
1428 | scn->scn_zio_root = zio_root(dp->dp_spa, NULL, | |
1429 | NULL, ZIO_FLAG_MUSTSUCCEED); | |
1430 | err = bptree_iterate(dp->dp_meta_objset, | |
1431 | dp->dp_bptree_obj, B_TRUE, dsl_scan_free_block_cb, | |
1432 | scn, tx); | |
13fe0198 MA |
1433 | VERIFY0(zio_wait(scn->scn_zio_root)); |
1434 | ||
1435 | if (err == 0) { | |
1436 | zfeature_info_t *feat = &spa_feature_table | |
1437 | [SPA_FEATURE_ASYNC_DESTROY]; | |
1438 | /* finished; deactivate async destroy feature */ | |
1439 | spa_feature_decr(spa, feat, tx); | |
1440 | ASSERT(!spa_feature_is_active(spa, feat)); | |
1441 | VERIFY0(zap_remove(dp->dp_meta_objset, | |
1442 | DMU_POOL_DIRECTORY_OBJECT, | |
1443 | DMU_POOL_BPTREE_OBJ, tx)); | |
1444 | VERIFY0(bptree_free(dp->dp_meta_objset, | |
1445 | dp->dp_bptree_obj, tx)); | |
1446 | dp->dp_bptree_obj = 0; | |
1447 | } | |
9ae529ec | 1448 | } |
428870ff BB |
1449 | if (scn->scn_visited_this_txg) { |
1450 | zfs_dbgmsg("freed %llu blocks in %llums from " | |
9ae529ec | 1451 | "free_bpobj/bptree txg %llu", |
428870ff BB |
1452 | (longlong_t)scn->scn_visited_this_txg, |
1453 | (longlong_t) | |
1454 | (gethrtime() - scn->scn_sync_start_time) / MICROSEC, | |
1455 | (longlong_t)tx->tx_txg); | |
1456 | scn->scn_visited_this_txg = 0; | |
1457 | /* | |
1458 | * Re-sync the ddt so that we can further modify | |
1459 | * it when doing bprewrite. | |
1460 | */ | |
1461 | ddt_sync(spa, tx->tx_txg); | |
1462 | } | |
1463 | if (err == ERESTART) | |
1464 | return; | |
1465 | } | |
1466 | ||
1467 | if (scn->scn_phys.scn_state != DSS_SCANNING) | |
1468 | return; | |
1469 | ||
428870ff BB |
1470 | if (scn->scn_phys.scn_ddt_bookmark.ddb_class <= |
1471 | scn->scn_phys.scn_ddt_class_max) { | |
1472 | zfs_dbgmsg("doing scan sync txg %llu; " | |
1473 | "ddt bm=%llu/%llu/%llu/%llx", | |
1474 | (longlong_t)tx->tx_txg, | |
1475 | (longlong_t)scn->scn_phys.scn_ddt_bookmark.ddb_class, | |
1476 | (longlong_t)scn->scn_phys.scn_ddt_bookmark.ddb_type, | |
1477 | (longlong_t)scn->scn_phys.scn_ddt_bookmark.ddb_checksum, | |
1478 | (longlong_t)scn->scn_phys.scn_ddt_bookmark.ddb_cursor); | |
1479 | ASSERT(scn->scn_phys.scn_bookmark.zb_objset == 0); | |
1480 | ASSERT(scn->scn_phys.scn_bookmark.zb_object == 0); | |
1481 | ASSERT(scn->scn_phys.scn_bookmark.zb_level == 0); | |
1482 | ASSERT(scn->scn_phys.scn_bookmark.zb_blkid == 0); | |
1483 | } else { | |
1484 | zfs_dbgmsg("doing scan sync txg %llu; bm=%llu/%llu/%llu/%llu", | |
1485 | (longlong_t)tx->tx_txg, | |
1486 | (longlong_t)scn->scn_phys.scn_bookmark.zb_objset, | |
1487 | (longlong_t)scn->scn_phys.scn_bookmark.zb_object, | |
1488 | (longlong_t)scn->scn_phys.scn_bookmark.zb_level, | |
1489 | (longlong_t)scn->scn_phys.scn_bookmark.zb_blkid); | |
1490 | } | |
1491 | ||
1492 | scn->scn_zio_root = zio_root(dp->dp_spa, NULL, | |
1493 | NULL, ZIO_FLAG_CANFAIL); | |
13fe0198 | 1494 | dsl_pool_config_enter(dp, FTAG); |
428870ff | 1495 | dsl_scan_visit(scn, tx); |
13fe0198 | 1496 | dsl_pool_config_exit(dp, FTAG); |
428870ff BB |
1497 | (void) zio_wait(scn->scn_zio_root); |
1498 | scn->scn_zio_root = NULL; | |
1499 | ||
1500 | zfs_dbgmsg("visited %llu blocks in %llums", | |
1501 | (longlong_t)scn->scn_visited_this_txg, | |
1502 | (longlong_t)(gethrtime() - scn->scn_sync_start_time) / MICROSEC); | |
1503 | ||
1504 | if (!scn->scn_pausing) { | |
1505 | /* finished with scan. */ | |
1506 | zfs_dbgmsg("finished scan txg %llu", (longlong_t)tx->tx_txg); | |
1507 | dsl_scan_done(scn, B_TRUE, tx); | |
1508 | } | |
1509 | ||
1510 | if (DSL_SCAN_IS_SCRUB_RESILVER(scn)) { | |
1511 | mutex_enter(&spa->spa_scrub_lock); | |
1512 | while (spa->spa_scrub_inflight > 0) { | |
1513 | cv_wait(&spa->spa_scrub_io_cv, | |
1514 | &spa->spa_scrub_lock); | |
1515 | } | |
1516 | mutex_exit(&spa->spa_scrub_lock); | |
1517 | } | |
1518 | ||
1519 | dsl_scan_sync_state(scn, tx); | |
1520 | } | |
1521 | ||
1522 | /* | |
1523 | * This will start a new scan, or restart an existing one. | |
1524 | */ | |
1525 | void | |
1526 | dsl_resilver_restart(dsl_pool_t *dp, uint64_t txg) | |
1527 | { | |
1528 | if (txg == 0) { | |
1529 | dmu_tx_t *tx; | |
1530 | tx = dmu_tx_create_dd(dp->dp_mos_dir); | |
1531 | VERIFY(0 == dmu_tx_assign(tx, TXG_WAIT)); | |
1532 | ||
1533 | txg = dmu_tx_get_txg(tx); | |
1534 | dp->dp_scan->scn_restart_txg = txg; | |
1535 | dmu_tx_commit(tx); | |
1536 | } else { | |
1537 | dp->dp_scan->scn_restart_txg = txg; | |
1538 | } | |
1539 | zfs_dbgmsg("restarting resilver txg=%llu", txg); | |
1540 | } | |
1541 | ||
1542 | boolean_t | |
1543 | dsl_scan_resilvering(dsl_pool_t *dp) | |
1544 | { | |
1545 | return (dp->dp_scan->scn_phys.scn_state == DSS_SCANNING && | |
1546 | dp->dp_scan->scn_phys.scn_func == POOL_SCAN_RESILVER); | |
1547 | } | |
1548 | ||
1549 | /* | |
1550 | * scrub consumers | |
1551 | */ | |
1552 | ||
1553 | static void | |
1554 | count_block(zfs_all_blkstats_t *zab, const blkptr_t *bp) | |
1555 | { | |
1556 | int i; | |
1557 | ||
1558 | /* | |
1559 | * If we resume after a reboot, zab will be NULL; don't record | |
1560 | * incomplete stats in that case. | |
1561 | */ | |
1562 | if (zab == NULL) | |
1563 | return; | |
1564 | ||
1565 | for (i = 0; i < 4; i++) { | |
1566 | int l = (i < 2) ? BP_GET_LEVEL(bp) : DN_MAX_LEVELS; | |
1567 | int t = (i & 1) ? BP_GET_TYPE(bp) : DMU_OT_TOTAL; | |
428870ff | 1568 | int equal; |
9ae529ec CS |
1569 | zfs_blkstat_t *zb; |
1570 | ||
1571 | if (t & DMU_OT_NEWTYPE) | |
1572 | t = DMU_OT_OTHER; | |
428870ff | 1573 | |
9ae529ec | 1574 | zb = &zab->zab_type[l][t]; |
428870ff BB |
1575 | zb->zb_count++; |
1576 | zb->zb_asize += BP_GET_ASIZE(bp); | |
1577 | zb->zb_lsize += BP_GET_LSIZE(bp); | |
1578 | zb->zb_psize += BP_GET_PSIZE(bp); | |
1579 | zb->zb_gangs += BP_COUNT_GANG(bp); | |
1580 | ||
1581 | switch (BP_GET_NDVAS(bp)) { | |
1582 | case 2: | |
1583 | if (DVA_GET_VDEV(&bp->blk_dva[0]) == | |
1584 | DVA_GET_VDEV(&bp->blk_dva[1])) | |
1585 | zb->zb_ditto_2_of_2_samevdev++; | |
1586 | break; | |
1587 | case 3: | |
1588 | equal = (DVA_GET_VDEV(&bp->blk_dva[0]) == | |
1589 | DVA_GET_VDEV(&bp->blk_dva[1])) + | |
1590 | (DVA_GET_VDEV(&bp->blk_dva[0]) == | |
1591 | DVA_GET_VDEV(&bp->blk_dva[2])) + | |
1592 | (DVA_GET_VDEV(&bp->blk_dva[1]) == | |
1593 | DVA_GET_VDEV(&bp->blk_dva[2])); | |
1594 | if (equal == 1) | |
1595 | zb->zb_ditto_2_of_3_samevdev++; | |
1596 | else if (equal == 3) | |
1597 | zb->zb_ditto_3_of_3_samevdev++; | |
1598 | break; | |
1599 | } | |
1600 | } | |
1601 | } | |
1602 | ||
1603 | static void | |
1604 | dsl_scan_scrub_done(zio_t *zio) | |
1605 | { | |
1606 | spa_t *spa = zio->io_spa; | |
1607 | ||
1608 | zio_data_buf_free(zio->io_data, zio->io_size); | |
1609 | ||
1610 | mutex_enter(&spa->spa_scrub_lock); | |
1611 | spa->spa_scrub_inflight--; | |
1612 | cv_broadcast(&spa->spa_scrub_io_cv); | |
1613 | ||
1614 | if (zio->io_error && (zio->io_error != ECKSUM || | |
1615 | !(zio->io_flags & ZIO_FLAG_SPECULATIVE))) { | |
1616 | spa->spa_dsl_pool->dp_scan->scn_phys.scn_errors++; | |
1617 | } | |
1618 | mutex_exit(&spa->spa_scrub_lock); | |
1619 | } | |
1620 | ||
1621 | static int | |
1622 | dsl_scan_scrub_cb(dsl_pool_t *dp, | |
1623 | const blkptr_t *bp, const zbookmark_t *zb) | |
1624 | { | |
1625 | dsl_scan_t *scn = dp->dp_scan; | |
1626 | size_t size = BP_GET_PSIZE(bp); | |
1627 | spa_t *spa = dp->dp_spa; | |
1628 | uint64_t phys_birth = BP_PHYSICAL_BIRTH(bp); | |
d6320ddb | 1629 | boolean_t needs_io = B_FALSE; |
572e2857 | 1630 | int zio_flags = ZIO_FLAG_SCAN_THREAD | ZIO_FLAG_RAW | ZIO_FLAG_CANFAIL; |
d6320ddb | 1631 | int zio_priority = 0; |
572e2857 | 1632 | int scan_delay = 0; |
d6320ddb | 1633 | int d; |
428870ff BB |
1634 | |
1635 | if (phys_birth <= scn->scn_phys.scn_min_txg || | |
1636 | phys_birth >= scn->scn_phys.scn_max_txg) | |
1637 | return (0); | |
1638 | ||
1639 | count_block(dp->dp_blkstats, bp); | |
1640 | ||
1641 | ASSERT(DSL_SCAN_IS_SCRUB_RESILVER(scn)); | |
1642 | if (scn->scn_phys.scn_func == POOL_SCAN_SCRUB) { | |
1643 | zio_flags |= ZIO_FLAG_SCRUB; | |
1644 | zio_priority = ZIO_PRIORITY_SCRUB; | |
1645 | needs_io = B_TRUE; | |
572e2857 | 1646 | scan_delay = zfs_scrub_delay; |
a117a6d6 GW |
1647 | } else { |
1648 | ASSERT3U(scn->scn_phys.scn_func, ==, POOL_SCAN_RESILVER); | |
428870ff BB |
1649 | zio_flags |= ZIO_FLAG_RESILVER; |
1650 | zio_priority = ZIO_PRIORITY_RESILVER; | |
1651 | needs_io = B_FALSE; | |
572e2857 | 1652 | scan_delay = zfs_resilver_delay; |
428870ff BB |
1653 | } |
1654 | ||
1655 | /* If it's an intent log block, failure is expected. */ | |
1656 | if (zb->zb_level == ZB_ZIL_LEVEL) | |
1657 | zio_flags |= ZIO_FLAG_SPECULATIVE; | |
1658 | ||
d6320ddb | 1659 | for (d = 0; d < BP_GET_NDVAS(bp); d++) { |
428870ff BB |
1660 | vdev_t *vd = vdev_lookup_top(spa, |
1661 | DVA_GET_VDEV(&bp->blk_dva[d])); | |
1662 | ||
1663 | /* | |
1664 | * Keep track of how much data we've examined so that | |
1665 | * zpool(1M) status can make useful progress reports. | |
1666 | */ | |
1667 | scn->scn_phys.scn_examined += DVA_GET_ASIZE(&bp->blk_dva[d]); | |
1668 | spa->spa_scan_pass_exam += DVA_GET_ASIZE(&bp->blk_dva[d]); | |
1669 | ||
1670 | /* if it's a resilver, this may not be in the target range */ | |
1671 | if (!needs_io) { | |
1672 | if (DVA_GET_GANG(&bp->blk_dva[d])) { | |
1673 | /* | |
1674 | * Gang members may be spread across multiple | |
1675 | * vdevs, so the best estimate we have is the | |
1676 | * scrub range, which has already been checked. | |
1677 | * XXX -- it would be better to change our | |
1678 | * allocation policy to ensure that all | |
1679 | * gang members reside on the same vdev. | |
1680 | */ | |
1681 | needs_io = B_TRUE; | |
1682 | } else { | |
1683 | needs_io = vdev_dtl_contains(vd, DTL_PARTIAL, | |
1684 | phys_birth, 1); | |
1685 | } | |
1686 | } | |
1687 | } | |
1688 | ||
1689 | if (needs_io && !zfs_no_scrub_io) { | |
572e2857 BB |
1690 | vdev_t *rvd = spa->spa_root_vdev; |
1691 | uint64_t maxinflight = rvd->vdev_children * zfs_top_maxinflight; | |
428870ff BB |
1692 | void *data = zio_data_buf_alloc(size); |
1693 | ||
1694 | mutex_enter(&spa->spa_scrub_lock); | |
572e2857 | 1695 | while (spa->spa_scrub_inflight >= maxinflight) |
428870ff BB |
1696 | cv_wait(&spa->spa_scrub_io_cv, &spa->spa_scrub_lock); |
1697 | spa->spa_scrub_inflight++; | |
1698 | mutex_exit(&spa->spa_scrub_lock); | |
1699 | ||
572e2857 BB |
1700 | /* |
1701 | * If we're seeing recent (zfs_scan_idle) "important" I/Os | |
1702 | * then throttle our workload to limit the impact of a scan. | |
1703 | */ | |
1704 | if (ddi_get_lbolt64() - spa->spa_last_io <= zfs_scan_idle) | |
1705 | delay(scan_delay); | |
1706 | ||
428870ff BB |
1707 | zio_nowait(zio_read(NULL, spa, bp, data, size, |
1708 | dsl_scan_scrub_done, NULL, zio_priority, | |
1709 | zio_flags, zb)); | |
1710 | } | |
1711 | ||
1712 | /* do not relocate this block */ | |
1713 | return (0); | |
1714 | } | |
1715 | ||
1716 | int | |
1717 | dsl_scan(dsl_pool_t *dp, pool_scan_func_t func) | |
1718 | { | |
1719 | spa_t *spa = dp->dp_spa; | |
1720 | ||
1721 | /* | |
1722 | * Purge all vdev caches and probe all devices. We do this here | |
1723 | * rather than in sync context because this requires a writer lock | |
1724 | * on the spa_config lock, which we can't do from sync context. The | |
1725 | * spa_scrub_reopen flag indicates that vdev_open() should not | |
1726 | * attempt to start another scrub. | |
1727 | */ | |
1728 | spa_vdev_state_enter(spa, SCL_NONE); | |
1729 | spa->spa_scrub_reopen = B_TRUE; | |
1730 | vdev_reopen(spa->spa_root_vdev); | |
1731 | spa->spa_scrub_reopen = B_FALSE; | |
1732 | (void) spa_vdev_state_exit(spa, NULL, 0); | |
1733 | ||
13fe0198 MA |
1734 | return (dsl_sync_task(spa_name(spa), dsl_scan_setup_check, |
1735 | dsl_scan_setup_sync, &func, 0)); | |
428870ff | 1736 | } |
c409e464 BB |
1737 | |
1738 | #if defined(_KERNEL) && defined(HAVE_SPL) | |
1739 | module_param(zfs_top_maxinflight, int, 0644); | |
1740 | MODULE_PARM_DESC(zfs_top_maxinflight, "Max I/Os per top-level"); | |
1741 | ||
1742 | module_param(zfs_resilver_delay, int, 0644); | |
1743 | MODULE_PARM_DESC(zfs_resilver_delay, "Number of ticks to delay resilver"); | |
1744 | ||
1745 | module_param(zfs_scrub_delay, int, 0644); | |
1746 | MODULE_PARM_DESC(zfs_scrub_delay, "Number of ticks to delay scrub"); | |
1747 | ||
1748 | module_param(zfs_scan_idle, int, 0644); | |
1749 | MODULE_PARM_DESC(zfs_scan_idle, "Idle window in clock ticks"); | |
1750 | ||
1751 | module_param(zfs_scan_min_time_ms, int, 0644); | |
1752 | MODULE_PARM_DESC(zfs_scan_min_time_ms, "Min millisecs to scrub per txg"); | |
1753 | ||
1754 | module_param(zfs_free_min_time_ms, int, 0644); | |
1755 | MODULE_PARM_DESC(zfs_free_min_time_ms, "Min millisecs to free per txg"); | |
1756 | ||
1757 | module_param(zfs_resilver_min_time_ms, int, 0644); | |
1758 | MODULE_PARM_DESC(zfs_resilver_min_time_ms, "Min millisecs to resilver per txg"); | |
1759 | ||
1760 | module_param(zfs_no_scrub_io, int, 0644); | |
1761 | MODULE_PARM_DESC(zfs_no_scrub_io, "Set to disable scrub I/O"); | |
1762 | ||
1763 | module_param(zfs_no_scrub_prefetch, int, 0644); | |
1764 | MODULE_PARM_DESC(zfs_no_scrub_prefetch, "Set to disable scrub prefetching"); | |
c409e464 | 1765 | #endif |