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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. | |
5dbd68a3 | 23 | * Copyright (c) 2011, 2014 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 | ||
5dbd68a3 MA |
53 | typedef int (scan_cb_t)(dsl_pool_t *, const blkptr_t *, |
54 | const zbookmark_phys_t *); | |
428870ff | 55 | |
428870ff | 56 | static scan_cb_t dsl_scan_scrub_cb; |
13fe0198 | 57 | static void dsl_scan_cancel_sync(void *, dmu_tx_t *); |
428870ff BB |
58 | static void dsl_scan_sync_state(dsl_scan_t *, dmu_tx_t *tx); |
59 | ||
572e2857 BB |
60 | int zfs_top_maxinflight = 32; /* maximum I/Os per top-level */ |
61 | int zfs_resilver_delay = 2; /* number of ticks to delay resilver */ | |
62 | int zfs_scrub_delay = 4; /* number of ticks to delay scrub */ | |
63 | int zfs_scan_idle = 50; /* idle window in clock ticks */ | |
64 | ||
428870ff BB |
65 | int zfs_scan_min_time_ms = 1000; /* min millisecs to scrub per txg */ |
66 | int zfs_free_min_time_ms = 1000; /* min millisecs to free per txg */ | |
67 | int zfs_resilver_min_time_ms = 3000; /* min millisecs to resilver per txg */ | |
c409e464 | 68 | int zfs_no_scrub_io = B_FALSE; /* set to disable scrub i/o */ |
fbeddd60 | 69 | int zfs_no_scrub_prefetch = B_FALSE; /* set to disable scrub prefetch */ |
428870ff BB |
70 | enum ddt_class zfs_scrub_ddt_class_max = DDT_CLASS_DUPLICATE; |
71 | int dsl_scan_delay_completion = B_FALSE; /* set to delay scan completion */ | |
36283ca2 MG |
72 | /* max number of blocks to free in a single TXG */ |
73 | ulong zfs_free_max_blocks = 100000; | |
428870ff BB |
74 | |
75 | #define DSL_SCAN_IS_SCRUB_RESILVER(scn) \ | |
76 | ((scn)->scn_phys.scn_func == POOL_SCAN_SCRUB || \ | |
77 | (scn)->scn_phys.scn_func == POOL_SCAN_RESILVER) | |
78 | ||
428870ff BB |
79 | /* the order has to match pool_scan_type */ |
80 | static scan_cb_t *scan_funcs[POOL_SCAN_FUNCS] = { | |
81 | NULL, | |
82 | dsl_scan_scrub_cb, /* POOL_SCAN_SCRUB */ | |
83 | dsl_scan_scrub_cb, /* POOL_SCAN_RESILVER */ | |
84 | }; | |
85 | ||
86 | int | |
87 | dsl_scan_init(dsl_pool_t *dp, uint64_t txg) | |
88 | { | |
89 | int err; | |
90 | dsl_scan_t *scn; | |
91 | spa_t *spa = dp->dp_spa; | |
92 | uint64_t f; | |
93 | ||
94 | scn = dp->dp_scan = kmem_zalloc(sizeof (dsl_scan_t), KM_SLEEP); | |
95 | scn->scn_dp = dp; | |
96 | ||
2696dfaf GW |
97 | /* |
98 | * It's possible that we're resuming a scan after a reboot so | |
99 | * make sure that the scan_async_destroying flag is initialized | |
100 | * appropriately. | |
101 | */ | |
102 | ASSERT(!scn->scn_async_destroying); | |
103 | scn->scn_async_destroying = spa_feature_is_active(dp->dp_spa, | |
fa86b5db | 104 | SPA_FEATURE_ASYNC_DESTROY); |
2696dfaf | 105 | |
428870ff BB |
106 | err = zap_lookup(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT, |
107 | "scrub_func", sizeof (uint64_t), 1, &f); | |
108 | if (err == 0) { | |
109 | /* | |
110 | * There was an old-style scrub in progress. Restart a | |
111 | * new-style scrub from the beginning. | |
112 | */ | |
113 | scn->scn_restart_txg = txg; | |
114 | zfs_dbgmsg("old-style scrub was in progress; " | |
115 | "restarting new-style scrub in txg %llu", | |
116 | scn->scn_restart_txg); | |
117 | ||
118 | /* | |
119 | * Load the queue obj from the old location so that it | |
120 | * can be freed by dsl_scan_done(). | |
121 | */ | |
122 | (void) zap_lookup(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT, | |
123 | "scrub_queue", sizeof (uint64_t), 1, | |
124 | &scn->scn_phys.scn_queue_obj); | |
125 | } else { | |
126 | err = zap_lookup(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT, | |
127 | DMU_POOL_SCAN, sizeof (uint64_t), SCAN_PHYS_NUMINTS, | |
128 | &scn->scn_phys); | |
4f2dcb3e RY |
129 | /* |
130 | * Detect if the pool contains the signature of #2094. If it | |
131 | * does properly update the scn->scn_phys structure and notify | |
132 | * the administrator by setting an errata for the pool. | |
133 | */ | |
134 | if (err == EOVERFLOW) { | |
135 | uint64_t zaptmp[SCAN_PHYS_NUMINTS + 1]; | |
136 | VERIFY3S(SCAN_PHYS_NUMINTS, ==, 24); | |
137 | VERIFY3S(offsetof(dsl_scan_phys_t, scn_flags), ==, | |
138 | (23 * sizeof (uint64_t))); | |
139 | ||
140 | err = zap_lookup(dp->dp_meta_objset, | |
141 | DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_SCAN, | |
142 | sizeof (uint64_t), SCAN_PHYS_NUMINTS + 1, &zaptmp); | |
143 | if (err == 0) { | |
144 | uint64_t overflow = zaptmp[SCAN_PHYS_NUMINTS]; | |
145 | ||
146 | if (overflow & ~DSL_SCAN_FLAGS_MASK || | |
147 | scn->scn_async_destroying) { | |
148 | spa->spa_errata = | |
149 | ZPOOL_ERRATA_ZOL_2094_ASYNC_DESTROY; | |
150 | return (EOVERFLOW); | |
151 | } | |
152 | ||
153 | bcopy(zaptmp, &scn->scn_phys, | |
154 | SCAN_PHYS_NUMINTS * sizeof (uint64_t)); | |
155 | scn->scn_phys.scn_flags = overflow; | |
156 | ||
157 | /* Required scrub already in progress. */ | |
158 | if (scn->scn_phys.scn_state == DSS_FINISHED || | |
159 | scn->scn_phys.scn_state == DSS_CANCELED) | |
160 | spa->spa_errata = | |
161 | ZPOOL_ERRATA_ZOL_2094_SCRUB; | |
162 | } | |
163 | } | |
164 | ||
428870ff BB |
165 | if (err == ENOENT) |
166 | return (0); | |
167 | else if (err) | |
168 | return (err); | |
169 | ||
170 | if (scn->scn_phys.scn_state == DSS_SCANNING && | |
171 | spa_prev_software_version(dp->dp_spa) < SPA_VERSION_SCAN) { | |
172 | /* | |
173 | * A new-type scrub was in progress on an old | |
174 | * pool, and the pool was accessed by old | |
175 | * software. Restart from the beginning, since | |
176 | * the old software may have changed the pool in | |
177 | * the meantime. | |
178 | */ | |
179 | scn->scn_restart_txg = txg; | |
180 | zfs_dbgmsg("new-style scrub was modified " | |
181 | "by old software; restarting in txg %llu", | |
182 | scn->scn_restart_txg); | |
183 | } | |
184 | } | |
185 | ||
186 | spa_scan_stat_init(spa); | |
187 | return (0); | |
188 | } | |
189 | ||
190 | void | |
191 | dsl_scan_fini(dsl_pool_t *dp) | |
192 | { | |
193 | if (dp->dp_scan) { | |
194 | kmem_free(dp->dp_scan, sizeof (dsl_scan_t)); | |
195 | dp->dp_scan = NULL; | |
196 | } | |
197 | } | |
198 | ||
199 | /* ARGSUSED */ | |
200 | static int | |
13fe0198 | 201 | dsl_scan_setup_check(void *arg, dmu_tx_t *tx) |
428870ff | 202 | { |
13fe0198 | 203 | dsl_scan_t *scn = dmu_tx_pool(tx)->dp_scan; |
428870ff BB |
204 | |
205 | if (scn->scn_phys.scn_state == DSS_SCANNING) | |
2e528b49 | 206 | return (SET_ERROR(EBUSY)); |
428870ff BB |
207 | |
208 | return (0); | |
209 | } | |
210 | ||
428870ff | 211 | static void |
13fe0198 | 212 | dsl_scan_setup_sync(void *arg, dmu_tx_t *tx) |
428870ff | 213 | { |
13fe0198 MA |
214 | dsl_scan_t *scn = dmu_tx_pool(tx)->dp_scan; |
215 | pool_scan_func_t *funcp = arg; | |
428870ff BB |
216 | dmu_object_type_t ot = 0; |
217 | dsl_pool_t *dp = scn->scn_dp; | |
218 | spa_t *spa = dp->dp_spa; | |
219 | ||
220 | ASSERT(scn->scn_phys.scn_state != DSS_SCANNING); | |
221 | ASSERT(*funcp > POOL_SCAN_NONE && *funcp < POOL_SCAN_FUNCS); | |
222 | bzero(&scn->scn_phys, sizeof (scn->scn_phys)); | |
223 | scn->scn_phys.scn_func = *funcp; | |
224 | scn->scn_phys.scn_state = DSS_SCANNING; | |
225 | scn->scn_phys.scn_min_txg = 0; | |
226 | scn->scn_phys.scn_max_txg = tx->tx_txg; | |
227 | scn->scn_phys.scn_ddt_class_max = DDT_CLASSES - 1; /* the entire DDT */ | |
228 | scn->scn_phys.scn_start_time = gethrestime_sec(); | |
229 | scn->scn_phys.scn_errors = 0; | |
230 | scn->scn_phys.scn_to_examine = spa->spa_root_vdev->vdev_stat.vs_alloc; | |
231 | scn->scn_restart_txg = 0; | |
5d1f7fb6 | 232 | scn->scn_done_txg = 0; |
428870ff BB |
233 | spa_scan_stat_init(spa); |
234 | ||
235 | if (DSL_SCAN_IS_SCRUB_RESILVER(scn)) { | |
236 | scn->scn_phys.scn_ddt_class_max = zfs_scrub_ddt_class_max; | |
237 | ||
238 | /* rewrite all disk labels */ | |
239 | vdev_config_dirty(spa->spa_root_vdev); | |
240 | ||
241 | if (vdev_resilver_needed(spa->spa_root_vdev, | |
242 | &scn->scn_phys.scn_min_txg, &scn->scn_phys.scn_max_txg)) { | |
d1d7e268 MK |
243 | spa_event_notify(spa, NULL, |
244 | FM_EREPORT_ZFS_RESILVER_START); | |
428870ff | 245 | } else { |
d1d7e268 MK |
246 | spa_event_notify(spa, NULL, |
247 | FM_EREPORT_ZFS_SCRUB_START); | |
428870ff BB |
248 | } |
249 | ||
250 | spa->spa_scrub_started = B_TRUE; | |
251 | /* | |
252 | * If this is an incremental scrub, limit the DDT scrub phase | |
253 | * to just the auto-ditto class (for correctness); the rest | |
254 | * of the scrub should go faster using top-down pruning. | |
255 | */ | |
256 | if (scn->scn_phys.scn_min_txg > TXG_INITIAL) | |
257 | scn->scn_phys.scn_ddt_class_max = DDT_CLASS_DITTO; | |
258 | ||
259 | } | |
260 | ||
261 | /* back to the generic stuff */ | |
262 | ||
263 | if (dp->dp_blkstats == NULL) { | |
79c76d5b BB |
264 | dp->dp_blkstats = |
265 | vmem_alloc(sizeof (zfs_all_blkstats_t), KM_SLEEP); | |
428870ff BB |
266 | } |
267 | bzero(dp->dp_blkstats, sizeof (zfs_all_blkstats_t)); | |
268 | ||
269 | if (spa_version(spa) < SPA_VERSION_DSL_SCRUB) | |
270 | ot = DMU_OT_ZAP_OTHER; | |
271 | ||
272 | scn->scn_phys.scn_queue_obj = zap_create(dp->dp_meta_objset, | |
273 | ot ? ot : DMU_OT_SCAN_QUEUE, DMU_OT_NONE, 0, tx); | |
274 | ||
275 | dsl_scan_sync_state(scn, tx); | |
276 | ||
6f1ffb06 | 277 | spa_history_log_internal(spa, "scan setup", tx, |
428870ff BB |
278 | "func=%u mintxg=%llu maxtxg=%llu", |
279 | *funcp, scn->scn_phys.scn_min_txg, scn->scn_phys.scn_max_txg); | |
280 | } | |
281 | ||
282 | /* ARGSUSED */ | |
283 | static void | |
284 | dsl_scan_done(dsl_scan_t *scn, boolean_t complete, dmu_tx_t *tx) | |
285 | { | |
286 | static const char *old_names[] = { | |
287 | "scrub_bookmark", | |
288 | "scrub_ddt_bookmark", | |
289 | "scrub_ddt_class_max", | |
290 | "scrub_queue", | |
291 | "scrub_min_txg", | |
292 | "scrub_max_txg", | |
293 | "scrub_func", | |
294 | "scrub_errors", | |
295 | NULL | |
296 | }; | |
297 | ||
298 | dsl_pool_t *dp = scn->scn_dp; | |
299 | spa_t *spa = dp->dp_spa; | |
300 | int i; | |
301 | ||
302 | /* Remove any remnants of an old-style scrub. */ | |
303 | for (i = 0; old_names[i]; i++) { | |
304 | (void) zap_remove(dp->dp_meta_objset, | |
305 | DMU_POOL_DIRECTORY_OBJECT, old_names[i], tx); | |
306 | } | |
307 | ||
308 | if (scn->scn_phys.scn_queue_obj != 0) { | |
309 | VERIFY(0 == dmu_object_free(dp->dp_meta_objset, | |
310 | scn->scn_phys.scn_queue_obj, tx)); | |
311 | scn->scn_phys.scn_queue_obj = 0; | |
312 | } | |
313 | ||
314 | /* | |
315 | * If we were "restarted" from a stopped state, don't bother | |
316 | * with anything else. | |
317 | */ | |
318 | if (scn->scn_phys.scn_state != DSS_SCANNING) | |
319 | return; | |
320 | ||
321 | if (complete) | |
322 | scn->scn_phys.scn_state = DSS_FINISHED; | |
323 | else | |
324 | scn->scn_phys.scn_state = DSS_CANCELED; | |
325 | ||
6f1ffb06 | 326 | spa_history_log_internal(spa, "scan done", tx, |
428870ff BB |
327 | "complete=%u", complete); |
328 | ||
329 | if (DSL_SCAN_IS_SCRUB_RESILVER(scn)) { | |
330 | mutex_enter(&spa->spa_scrub_lock); | |
331 | while (spa->spa_scrub_inflight > 0) { | |
332 | cv_wait(&spa->spa_scrub_io_cv, | |
333 | &spa->spa_scrub_lock); | |
334 | } | |
335 | mutex_exit(&spa->spa_scrub_lock); | |
336 | spa->spa_scrub_started = B_FALSE; | |
337 | spa->spa_scrub_active = B_FALSE; | |
338 | ||
339 | /* | |
340 | * If the scrub/resilver completed, update all DTLs to | |
341 | * reflect this. Whether it succeeded or not, vacate | |
342 | * all temporary scrub DTLs. | |
343 | */ | |
344 | vdev_dtl_reassess(spa->spa_root_vdev, tx->tx_txg, | |
345 | complete ? scn->scn_phys.scn_max_txg : 0, B_TRUE); | |
346 | if (complete) { | |
347 | spa_event_notify(spa, NULL, scn->scn_phys.scn_min_txg ? | |
26685276 BB |
348 | FM_EREPORT_ZFS_RESILVER_FINISH : |
349 | FM_EREPORT_ZFS_SCRUB_FINISH); | |
428870ff BB |
350 | } |
351 | spa_errlog_rotate(spa); | |
352 | ||
353 | /* | |
354 | * We may have finished replacing a device. | |
355 | * Let the async thread assess this and handle the detach. | |
356 | */ | |
357 | spa_async_request(spa, SPA_ASYNC_RESILVER_DONE); | |
358 | } | |
359 | ||
360 | scn->scn_phys.scn_end_time = gethrestime_sec(); | |
4f2dcb3e RY |
361 | |
362 | if (spa->spa_errata == ZPOOL_ERRATA_ZOL_2094_SCRUB) | |
363 | spa->spa_errata = 0; | |
428870ff BB |
364 | } |
365 | ||
366 | /* ARGSUSED */ | |
367 | static int | |
13fe0198 | 368 | dsl_scan_cancel_check(void *arg, dmu_tx_t *tx) |
428870ff | 369 | { |
13fe0198 | 370 | dsl_scan_t *scn = dmu_tx_pool(tx)->dp_scan; |
428870ff BB |
371 | |
372 | if (scn->scn_phys.scn_state != DSS_SCANNING) | |
2e528b49 | 373 | return (SET_ERROR(ENOENT)); |
428870ff BB |
374 | return (0); |
375 | } | |
376 | ||
377 | /* ARGSUSED */ | |
378 | static void | |
13fe0198 | 379 | dsl_scan_cancel_sync(void *arg, dmu_tx_t *tx) |
428870ff | 380 | { |
13fe0198 | 381 | dsl_scan_t *scn = dmu_tx_pool(tx)->dp_scan; |
428870ff BB |
382 | |
383 | dsl_scan_done(scn, B_FALSE, tx); | |
384 | dsl_scan_sync_state(scn, tx); | |
385 | } | |
386 | ||
387 | int | |
388 | dsl_scan_cancel(dsl_pool_t *dp) | |
389 | { | |
13fe0198 | 390 | return (dsl_sync_task(spa_name(dp->dp_spa), dsl_scan_cancel_check, |
3d45fdd6 | 391 | dsl_scan_cancel_sync, NULL, 3, ZFS_SPACE_CHECK_RESERVED)); |
428870ff BB |
392 | } |
393 | ||
ebcf4936 MA |
394 | static void dsl_scan_visitbp(blkptr_t *bp, const zbookmark_phys_t *zb, |
395 | dnode_phys_t *dnp, dsl_dataset_t *ds, dsl_scan_t *scn, | |
396 | dmu_objset_type_t ostype, dmu_tx_t *tx); | |
10be533e BB |
397 | inline __attribute__((always_inline)) static void dsl_scan_visitdnode( |
398 | dsl_scan_t *, dsl_dataset_t *ds, dmu_objset_type_t ostype, | |
ebcf4936 | 399 | dnode_phys_t *dnp, uint64_t object, dmu_tx_t *tx); |
428870ff BB |
400 | |
401 | void | |
402 | dsl_free(dsl_pool_t *dp, uint64_t txg, const blkptr_t *bp) | |
403 | { | |
404 | zio_free(dp->dp_spa, txg, bp); | |
405 | } | |
406 | ||
407 | void | |
408 | dsl_free_sync(zio_t *pio, dsl_pool_t *dp, uint64_t txg, const blkptr_t *bpp) | |
409 | { | |
410 | ASSERT(dsl_pool_sync_context(dp)); | |
411 | zio_nowait(zio_free_sync(pio, dp->dp_spa, txg, bpp, pio->io_flags)); | |
412 | } | |
413 | ||
428870ff BB |
414 | static uint64_t |
415 | dsl_scan_ds_maxtxg(dsl_dataset_t *ds) | |
416 | { | |
417 | uint64_t smt = ds->ds_dir->dd_pool->dp_scan->scn_phys.scn_max_txg; | |
0c66c32d | 418 | if (ds->ds_is_snapshot) |
d683ddbb | 419 | return (MIN(smt, dsl_dataset_phys(ds)->ds_creation_txg)); |
428870ff BB |
420 | return (smt); |
421 | } | |
422 | ||
423 | static void | |
424 | dsl_scan_sync_state(dsl_scan_t *scn, dmu_tx_t *tx) | |
425 | { | |
13fe0198 | 426 | VERIFY0(zap_update(scn->scn_dp->dp_meta_objset, |
428870ff BB |
427 | DMU_POOL_DIRECTORY_OBJECT, |
428 | DMU_POOL_SCAN, sizeof (uint64_t), SCAN_PHYS_NUMINTS, | |
429 | &scn->scn_phys, tx)); | |
430 | } | |
431 | ||
10400bfe MA |
432 | extern int zfs_vdev_async_write_active_min_dirty_percent; |
433 | ||
428870ff | 434 | static boolean_t |
5dbd68a3 | 435 | dsl_scan_check_pause(dsl_scan_t *scn, const zbookmark_phys_t *zb) |
428870ff BB |
436 | { |
437 | uint64_t elapsed_nanosecs; | |
438 | int mintime; | |
10400bfe | 439 | int dirty_pct; |
428870ff BB |
440 | |
441 | /* we never skip user/group accounting objects */ | |
442 | if (zb && (int64_t)zb->zb_object < 0) | |
443 | return (B_FALSE); | |
444 | ||
445 | if (scn->scn_pausing) | |
446 | return (B_TRUE); /* we're already pausing */ | |
447 | ||
9ae529ec | 448 | if (!ZB_IS_ZERO(&scn->scn_phys.scn_bookmark)) |
428870ff BB |
449 | return (B_FALSE); /* we're resuming */ |
450 | ||
451 | /* We only know how to resume from level-0 blocks. */ | |
452 | if (zb && zb->zb_level != 0) | |
453 | return (B_FALSE); | |
454 | ||
10400bfe MA |
455 | /* |
456 | * We pause if: | |
457 | * - we have scanned for the maximum time: an entire txg | |
458 | * timeout (default 5 sec) | |
459 | * or | |
460 | * - we have scanned for at least the minimum time (default 1 sec | |
461 | * for scrub, 3 sec for resilver), and either we have sufficient | |
462 | * dirty data that we are starting to write more quickly | |
463 | * (default 30%), or someone is explicitly waiting for this txg | |
464 | * to complete. | |
465 | * or | |
466 | * - the spa is shutting down because this pool is being exported | |
467 | * or the machine is rebooting. | |
468 | */ | |
428870ff BB |
469 | mintime = (scn->scn_phys.scn_func == POOL_SCAN_RESILVER) ? |
470 | zfs_resilver_min_time_ms : zfs_scan_min_time_ms; | |
471 | elapsed_nanosecs = gethrtime() - scn->scn_sync_start_time; | |
10400bfe MA |
472 | dirty_pct = scn->scn_dp->dp_dirty_total * 100 / zfs_dirty_data_max; |
473 | if (elapsed_nanosecs / NANOSEC >= zfs_txg_timeout || | |
63fd3c6c | 474 | (NSEC2MSEC(elapsed_nanosecs) > mintime && |
10400bfe MA |
475 | (txg_sync_waiting(scn->scn_dp) || |
476 | dirty_pct >= zfs_vdev_async_write_active_min_dirty_percent)) || | |
428870ff BB |
477 | spa_shutting_down(scn->scn_dp->dp_spa)) { |
478 | if (zb) { | |
479 | dprintf("pausing at bookmark %llx/%llx/%llx/%llx\n", | |
480 | (longlong_t)zb->zb_objset, | |
481 | (longlong_t)zb->zb_object, | |
482 | (longlong_t)zb->zb_level, | |
483 | (longlong_t)zb->zb_blkid); | |
484 | scn->scn_phys.scn_bookmark = *zb; | |
485 | } | |
486 | dprintf("pausing at DDT bookmark %llx/%llx/%llx/%llx\n", | |
487 | (longlong_t)scn->scn_phys.scn_ddt_bookmark.ddb_class, | |
488 | (longlong_t)scn->scn_phys.scn_ddt_bookmark.ddb_type, | |
489 | (longlong_t)scn->scn_phys.scn_ddt_bookmark.ddb_checksum, | |
490 | (longlong_t)scn->scn_phys.scn_ddt_bookmark.ddb_cursor); | |
491 | scn->scn_pausing = B_TRUE; | |
492 | return (B_TRUE); | |
493 | } | |
494 | return (B_FALSE); | |
495 | } | |
496 | ||
497 | typedef struct zil_scan_arg { | |
498 | dsl_pool_t *zsa_dp; | |
499 | zil_header_t *zsa_zh; | |
500 | } zil_scan_arg_t; | |
501 | ||
502 | /* ARGSUSED */ | |
503 | static int | |
504 | dsl_scan_zil_block(zilog_t *zilog, blkptr_t *bp, void *arg, uint64_t claim_txg) | |
505 | { | |
506 | zil_scan_arg_t *zsa = arg; | |
507 | dsl_pool_t *dp = zsa->zsa_dp; | |
508 | dsl_scan_t *scn = dp->dp_scan; | |
509 | zil_header_t *zh = zsa->zsa_zh; | |
5dbd68a3 | 510 | zbookmark_phys_t zb; |
428870ff | 511 | |
b0bc7a84 | 512 | if (BP_IS_HOLE(bp) || bp->blk_birth <= scn->scn_phys.scn_cur_min_txg) |
428870ff BB |
513 | return (0); |
514 | ||
515 | /* | |
516 | * One block ("stubby") can be allocated a long time ago; we | |
517 | * want to visit that one because it has been allocated | |
518 | * (on-disk) even if it hasn't been claimed (even though for | |
519 | * scrub there's nothing to do to it). | |
520 | */ | |
521 | if (claim_txg == 0 && bp->blk_birth >= spa_first_txg(dp->dp_spa)) | |
522 | return (0); | |
523 | ||
524 | SET_BOOKMARK(&zb, zh->zh_log.blk_cksum.zc_word[ZIL_ZC_OBJSET], | |
525 | ZB_ZIL_OBJECT, ZB_ZIL_LEVEL, bp->blk_cksum.zc_word[ZIL_ZC_SEQ]); | |
526 | ||
527 | VERIFY(0 == scan_funcs[scn->scn_phys.scn_func](dp, bp, &zb)); | |
528 | return (0); | |
529 | } | |
530 | ||
531 | /* ARGSUSED */ | |
532 | static int | |
533 | dsl_scan_zil_record(zilog_t *zilog, lr_t *lrc, void *arg, uint64_t claim_txg) | |
534 | { | |
535 | if (lrc->lrc_txtype == TX_WRITE) { | |
536 | zil_scan_arg_t *zsa = arg; | |
537 | dsl_pool_t *dp = zsa->zsa_dp; | |
538 | dsl_scan_t *scn = dp->dp_scan; | |
539 | zil_header_t *zh = zsa->zsa_zh; | |
540 | lr_write_t *lr = (lr_write_t *)lrc; | |
541 | blkptr_t *bp = &lr->lr_blkptr; | |
5dbd68a3 | 542 | zbookmark_phys_t zb; |
428870ff | 543 | |
b0bc7a84 MG |
544 | if (BP_IS_HOLE(bp) || |
545 | bp->blk_birth <= scn->scn_phys.scn_cur_min_txg) | |
428870ff BB |
546 | return (0); |
547 | ||
548 | /* | |
549 | * birth can be < claim_txg if this record's txg is | |
550 | * already txg sync'ed (but this log block contains | |
551 | * other records that are not synced) | |
552 | */ | |
553 | if (claim_txg == 0 || bp->blk_birth < claim_txg) | |
554 | return (0); | |
555 | ||
556 | SET_BOOKMARK(&zb, zh->zh_log.blk_cksum.zc_word[ZIL_ZC_OBJSET], | |
557 | lr->lr_foid, ZB_ZIL_LEVEL, | |
558 | lr->lr_offset / BP_GET_LSIZE(bp)); | |
559 | ||
560 | VERIFY(0 == scan_funcs[scn->scn_phys.scn_func](dp, bp, &zb)); | |
561 | } | |
562 | return (0); | |
563 | } | |
564 | ||
565 | static void | |
566 | dsl_scan_zil(dsl_pool_t *dp, zil_header_t *zh) | |
567 | { | |
568 | uint64_t claim_txg = zh->zh_claim_txg; | |
569 | zil_scan_arg_t zsa = { dp, zh }; | |
570 | zilog_t *zilog; | |
571 | ||
572 | /* | |
573 | * We only want to visit blocks that have been claimed but not yet | |
574 | * replayed (or, in read-only mode, blocks that *would* be claimed). | |
575 | */ | |
576 | if (claim_txg == 0 && spa_writeable(dp->dp_spa)) | |
577 | return; | |
578 | ||
579 | zilog = zil_alloc(dp->dp_meta_objset, zh); | |
580 | ||
581 | (void) zil_parse(zilog, dsl_scan_zil_block, dsl_scan_zil_record, &zsa, | |
582 | claim_txg); | |
583 | ||
584 | zil_free(zilog); | |
585 | } | |
586 | ||
587 | /* ARGSUSED */ | |
588 | static void | |
589 | dsl_scan_prefetch(dsl_scan_t *scn, arc_buf_t *buf, blkptr_t *bp, | |
590 | uint64_t objset, uint64_t object, uint64_t blkid) | |
591 | { | |
5dbd68a3 | 592 | zbookmark_phys_t czb; |
2a432414 | 593 | arc_flags_t flags = ARC_FLAG_NOWAIT | ARC_FLAG_PREFETCH; |
428870ff BB |
594 | |
595 | if (zfs_no_scrub_prefetch) | |
596 | return; | |
597 | ||
598 | if (BP_IS_HOLE(bp) || bp->blk_birth <= scn->scn_phys.scn_min_txg || | |
599 | (BP_GET_LEVEL(bp) == 0 && BP_GET_TYPE(bp) != DMU_OT_DNODE)) | |
600 | return; | |
601 | ||
602 | SET_BOOKMARK(&czb, objset, object, BP_GET_LEVEL(bp), blkid); | |
603 | ||
428870ff | 604 | (void) arc_read(scn->scn_zio_root, scn->scn_dp->dp_spa, bp, |
294f6806 | 605 | NULL, NULL, ZIO_PRIORITY_ASYNC_READ, |
572e2857 | 606 | ZIO_FLAG_CANFAIL | ZIO_FLAG_SCAN_THREAD, &flags, &czb); |
428870ff BB |
607 | } |
608 | ||
609 | static boolean_t | |
610 | dsl_scan_check_resume(dsl_scan_t *scn, const dnode_phys_t *dnp, | |
5dbd68a3 | 611 | const zbookmark_phys_t *zb) |
428870ff BB |
612 | { |
613 | /* | |
614 | * We never skip over user/group accounting objects (obj<0) | |
615 | */ | |
9ae529ec | 616 | if (!ZB_IS_ZERO(&scn->scn_phys.scn_bookmark) && |
428870ff BB |
617 | (int64_t)zb->zb_object >= 0) { |
618 | /* | |
619 | * If we already visited this bp & everything below (in | |
620 | * a prior txg sync), don't bother doing it again. | |
621 | */ | |
9ae529ec | 622 | if (zbookmark_is_before(dnp, zb, &scn->scn_phys.scn_bookmark)) |
428870ff BB |
623 | return (B_TRUE); |
624 | ||
625 | /* | |
626 | * If we found the block we're trying to resume from, or | |
627 | * we went past it to a different object, zero it out to | |
628 | * indicate that it's OK to start checking for pausing | |
629 | * again. | |
630 | */ | |
631 | if (bcmp(zb, &scn->scn_phys.scn_bookmark, sizeof (*zb)) == 0 || | |
632 | zb->zb_object > scn->scn_phys.scn_bookmark.zb_object) { | |
633 | dprintf("resuming at %llx/%llx/%llx/%llx\n", | |
634 | (longlong_t)zb->zb_objset, | |
635 | (longlong_t)zb->zb_object, | |
636 | (longlong_t)zb->zb_level, | |
637 | (longlong_t)zb->zb_blkid); | |
638 | bzero(&scn->scn_phys.scn_bookmark, sizeof (*zb)); | |
639 | } | |
640 | } | |
641 | return (B_FALSE); | |
642 | } | |
643 | ||
644 | /* | |
645 | * Return nonzero on i/o error. | |
646 | * Return new buf to write out in *bufp. | |
647 | */ | |
10be533e | 648 | inline __attribute__((always_inline)) static int |
428870ff BB |
649 | dsl_scan_recurse(dsl_scan_t *scn, dsl_dataset_t *ds, dmu_objset_type_t ostype, |
650 | dnode_phys_t *dnp, const blkptr_t *bp, | |
ebcf4936 | 651 | const zbookmark_phys_t *zb, dmu_tx_t *tx) |
428870ff BB |
652 | { |
653 | dsl_pool_t *dp = scn->scn_dp; | |
572e2857 | 654 | int zio_flags = ZIO_FLAG_CANFAIL | ZIO_FLAG_SCAN_THREAD; |
428870ff BB |
655 | int err; |
656 | ||
657 | if (BP_GET_LEVEL(bp) > 0) { | |
2a432414 | 658 | arc_flags_t flags = ARC_FLAG_WAIT; |
428870ff BB |
659 | int i; |
660 | blkptr_t *cbp; | |
661 | int epb = BP_GET_LSIZE(bp) >> SPA_BLKPTRSHIFT; | |
ebcf4936 | 662 | arc_buf_t *buf; |
428870ff | 663 | |
ebcf4936 | 664 | err = arc_read(NULL, dp->dp_spa, bp, arc_getbuf_func, &buf, |
572e2857 | 665 | ZIO_PRIORITY_ASYNC_READ, zio_flags, &flags, zb); |
428870ff BB |
666 | if (err) { |
667 | scn->scn_phys.scn_errors++; | |
668 | return (err); | |
669 | } | |
ebcf4936 MA |
670 | for (i = 0, cbp = buf->b_data; i < epb; i++, cbp++) { |
671 | dsl_scan_prefetch(scn, buf, cbp, zb->zb_objset, | |
428870ff BB |
672 | zb->zb_object, zb->zb_blkid * epb + i); |
673 | } | |
ebcf4936 | 674 | for (i = 0, cbp = buf->b_data; i < epb; i++, cbp++) { |
5dbd68a3 | 675 | zbookmark_phys_t czb; |
428870ff BB |
676 | |
677 | SET_BOOKMARK(&czb, zb->zb_objset, zb->zb_object, | |
678 | zb->zb_level - 1, | |
679 | zb->zb_blkid * epb + i); | |
680 | dsl_scan_visitbp(cbp, &czb, dnp, | |
ebcf4936 | 681 | ds, scn, ostype, tx); |
428870ff | 682 | } |
ebcf4936 | 683 | (void) arc_buf_remove_ref(buf, &buf); |
428870ff | 684 | } else if (BP_GET_TYPE(bp) == DMU_OT_DNODE) { |
2a432414 | 685 | arc_flags_t flags = ARC_FLAG_WAIT; |
428870ff BB |
686 | dnode_phys_t *cdnp; |
687 | int i, j; | |
688 | int epb = BP_GET_LSIZE(bp) >> DNODE_SHIFT; | |
ebcf4936 | 689 | arc_buf_t *buf; |
428870ff | 690 | |
ebcf4936 | 691 | err = arc_read(NULL, dp->dp_spa, bp, arc_getbuf_func, &buf, |
572e2857 | 692 | ZIO_PRIORITY_ASYNC_READ, zio_flags, &flags, zb); |
428870ff BB |
693 | if (err) { |
694 | scn->scn_phys.scn_errors++; | |
695 | return (err); | |
696 | } | |
ebcf4936 | 697 | for (i = 0, cdnp = buf->b_data; i < epb; i++, cdnp++) { |
428870ff BB |
698 | for (j = 0; j < cdnp->dn_nblkptr; j++) { |
699 | blkptr_t *cbp = &cdnp->dn_blkptr[j]; | |
ebcf4936 | 700 | dsl_scan_prefetch(scn, buf, cbp, |
428870ff BB |
701 | zb->zb_objset, zb->zb_blkid * epb + i, j); |
702 | } | |
703 | } | |
ebcf4936 | 704 | for (i = 0, cdnp = buf->b_data; i < epb; i++, cdnp++) { |
428870ff | 705 | dsl_scan_visitdnode(scn, ds, ostype, |
ebcf4936 | 706 | cdnp, zb->zb_blkid * epb + i, tx); |
428870ff BB |
707 | } |
708 | ||
ebcf4936 | 709 | (void) arc_buf_remove_ref(buf, &buf); |
428870ff | 710 | } else if (BP_GET_TYPE(bp) == DMU_OT_OBJSET) { |
2a432414 | 711 | arc_flags_t flags = ARC_FLAG_WAIT; |
428870ff | 712 | objset_phys_t *osp; |
ebcf4936 | 713 | arc_buf_t *buf; |
428870ff | 714 | |
ebcf4936 | 715 | err = arc_read(NULL, dp->dp_spa, bp, arc_getbuf_func, &buf, |
572e2857 | 716 | ZIO_PRIORITY_ASYNC_READ, zio_flags, &flags, zb); |
428870ff BB |
717 | if (err) { |
718 | scn->scn_phys.scn_errors++; | |
719 | return (err); | |
720 | } | |
721 | ||
ebcf4936 | 722 | osp = buf->b_data; |
428870ff | 723 | |
428870ff | 724 | dsl_scan_visitdnode(scn, ds, osp->os_type, |
ebcf4936 | 725 | &osp->os_meta_dnode, DMU_META_DNODE_OBJECT, tx); |
428870ff | 726 | |
ebcf4936 | 727 | if (OBJSET_BUF_HAS_USERUSED(buf)) { |
428870ff BB |
728 | /* |
729 | * We also always visit user/group accounting | |
730 | * objects, and never skip them, even if we are | |
731 | * pausing. This is necessary so that the space | |
732 | * deltas from this txg get integrated. | |
733 | */ | |
734 | dsl_scan_visitdnode(scn, ds, osp->os_type, | |
ebcf4936 | 735 | &osp->os_groupused_dnode, |
428870ff BB |
736 | DMU_GROUPUSED_OBJECT, tx); |
737 | dsl_scan_visitdnode(scn, ds, osp->os_type, | |
ebcf4936 | 738 | &osp->os_userused_dnode, |
428870ff BB |
739 | DMU_USERUSED_OBJECT, tx); |
740 | } | |
ebcf4936 | 741 | (void) arc_buf_remove_ref(buf, &buf); |
428870ff BB |
742 | } |
743 | ||
744 | return (0); | |
745 | } | |
746 | ||
10be533e | 747 | inline __attribute__((always_inline)) static void |
428870ff | 748 | dsl_scan_visitdnode(dsl_scan_t *scn, dsl_dataset_t *ds, |
ebcf4936 | 749 | dmu_objset_type_t ostype, dnode_phys_t *dnp, |
428870ff BB |
750 | uint64_t object, dmu_tx_t *tx) |
751 | { | |
752 | int j; | |
753 | ||
754 | for (j = 0; j < dnp->dn_nblkptr; j++) { | |
5dbd68a3 | 755 | zbookmark_phys_t czb; |
428870ff BB |
756 | |
757 | SET_BOOKMARK(&czb, ds ? ds->ds_object : 0, object, | |
758 | dnp->dn_nlevels - 1, j); | |
759 | dsl_scan_visitbp(&dnp->dn_blkptr[j], | |
ebcf4936 | 760 | &czb, dnp, ds, scn, ostype, tx); |
428870ff BB |
761 | } |
762 | ||
763 | if (dnp->dn_flags & DNODE_FLAG_SPILL_BLKPTR) { | |
5dbd68a3 | 764 | zbookmark_phys_t czb; |
428870ff BB |
765 | SET_BOOKMARK(&czb, ds ? ds->ds_object : 0, object, |
766 | 0, DMU_SPILL_BLKID); | |
767 | dsl_scan_visitbp(&dnp->dn_spill, | |
ebcf4936 | 768 | &czb, dnp, ds, scn, ostype, tx); |
428870ff BB |
769 | } |
770 | } | |
771 | ||
772 | /* | |
773 | * The arguments are in this order because mdb can only print the | |
774 | * first 5; we want them to be useful. | |
775 | */ | |
776 | static void | |
5dbd68a3 | 777 | dsl_scan_visitbp(blkptr_t *bp, const zbookmark_phys_t *zb, |
ebcf4936 MA |
778 | dnode_phys_t *dnp, dsl_dataset_t *ds, dsl_scan_t *scn, |
779 | dmu_objset_type_t ostype, dmu_tx_t *tx) | |
428870ff BB |
780 | { |
781 | dsl_pool_t *dp = scn->scn_dp; | |
161ce7ce BB |
782 | blkptr_t *bp_toread; |
783 | ||
79c76d5b | 784 | bp_toread = kmem_alloc(sizeof (blkptr_t), KM_SLEEP); |
161ce7ce | 785 | *bp_toread = *bp; |
428870ff BB |
786 | |
787 | /* ASSERT(pbuf == NULL || arc_released(pbuf)); */ | |
788 | ||
789 | if (dsl_scan_check_pause(scn, zb)) | |
161ce7ce | 790 | goto out; |
428870ff BB |
791 | |
792 | if (dsl_scan_check_resume(scn, dnp, zb)) | |
161ce7ce | 793 | goto out; |
428870ff | 794 | |
b0bc7a84 | 795 | if (BP_IS_HOLE(bp)) |
161ce7ce | 796 | goto out; |
428870ff BB |
797 | |
798 | scn->scn_visited_this_txg++; | |
799 | ||
b81c4ac9 BB |
800 | /* |
801 | * This debugging is commented out to conserve stack space. This | |
802 | * function is called recursively and the debugging addes several | |
803 | * bytes to the stack for each call. It can be commented back in | |
804 | * if required to debug an issue in dsl_scan_visitbp(). | |
805 | * | |
806 | * dprintf_bp(bp, | |
ebcf4936 | 807 | * "visiting ds=%p/%llu zb=%llx/%llx/%llx/%llx bp=%p", |
b81c4ac9 BB |
808 | * ds, ds ? ds->ds_object : 0, |
809 | * zb->zb_objset, zb->zb_object, zb->zb_level, zb->zb_blkid, | |
ebcf4936 | 810 | * bp); |
b81c4ac9 | 811 | */ |
428870ff BB |
812 | |
813 | if (bp->blk_birth <= scn->scn_phys.scn_cur_min_txg) | |
161ce7ce | 814 | goto out; |
428870ff | 815 | |
ebcf4936 | 816 | if (dsl_scan_recurse(scn, ds, ostype, dnp, bp_toread, zb, tx) != 0) |
161ce7ce | 817 | goto out; |
428870ff BB |
818 | |
819 | /* | |
820 | * If dsl_scan_ddt() has aready visited this block, it will have | |
821 | * already done any translations or scrubbing, so don't call the | |
822 | * callback again. | |
823 | */ | |
824 | if (ddt_class_contains(dp->dp_spa, | |
825 | scn->scn_phys.scn_ddt_class_max, bp)) { | |
161ce7ce | 826 | goto out; |
428870ff BB |
827 | } |
828 | ||
829 | /* | |
830 | * If this block is from the future (after cur_max_txg), then we | |
831 | * are doing this on behalf of a deleted snapshot, and we will | |
832 | * revisit the future block on the next pass of this dataset. | |
833 | * Don't scan it now unless we need to because something | |
834 | * under it was modified. | |
835 | */ | |
5d1f7fb6 | 836 | if (BP_PHYSICAL_BIRTH(bp) <= scn->scn_phys.scn_cur_max_txg) { |
428870ff BB |
837 | scan_funcs[scn->scn_phys.scn_func](dp, bp, zb); |
838 | } | |
161ce7ce | 839 | out: |
d1d7e268 | 840 | kmem_free(bp_toread, sizeof (blkptr_t)); |
428870ff BB |
841 | } |
842 | ||
843 | static void | |
844 | dsl_scan_visit_rootbp(dsl_scan_t *scn, dsl_dataset_t *ds, blkptr_t *bp, | |
845 | dmu_tx_t *tx) | |
846 | { | |
5dbd68a3 | 847 | zbookmark_phys_t zb; |
428870ff BB |
848 | |
849 | SET_BOOKMARK(&zb, ds ? ds->ds_object : DMU_META_OBJSET, | |
850 | ZB_ROOT_OBJECT, ZB_ROOT_LEVEL, ZB_ROOT_BLKID); | |
ebcf4936 | 851 | dsl_scan_visitbp(bp, &zb, NULL, |
428870ff BB |
852 | ds, scn, DMU_OST_NONE, tx); |
853 | ||
854 | dprintf_ds(ds, "finished scan%s", ""); | |
855 | } | |
856 | ||
857 | void | |
858 | dsl_scan_ds_destroyed(dsl_dataset_t *ds, dmu_tx_t *tx) | |
859 | { | |
860 | dsl_pool_t *dp = ds->ds_dir->dd_pool; | |
861 | dsl_scan_t *scn = dp->dp_scan; | |
862 | uint64_t mintxg; | |
863 | ||
864 | if (scn->scn_phys.scn_state != DSS_SCANNING) | |
865 | return; | |
866 | ||
867 | if (scn->scn_phys.scn_bookmark.zb_objset == ds->ds_object) { | |
0c66c32d | 868 | if (ds->ds_is_snapshot) { |
428870ff BB |
869 | /* Note, scn_cur_{min,max}_txg stays the same. */ |
870 | scn->scn_phys.scn_bookmark.zb_objset = | |
d683ddbb | 871 | dsl_dataset_phys(ds)->ds_next_snap_obj; |
428870ff BB |
872 | zfs_dbgmsg("destroying ds %llu; currently traversing; " |
873 | "reset zb_objset to %llu", | |
874 | (u_longlong_t)ds->ds_object, | |
d683ddbb JG |
875 | (u_longlong_t)dsl_dataset_phys(ds)-> |
876 | ds_next_snap_obj); | |
428870ff BB |
877 | scn->scn_phys.scn_flags |= DSF_VISIT_DS_AGAIN; |
878 | } else { | |
879 | SET_BOOKMARK(&scn->scn_phys.scn_bookmark, | |
880 | ZB_DESTROYED_OBJSET, 0, 0, 0); | |
881 | zfs_dbgmsg("destroying ds %llu; currently traversing; " | |
882 | "reset bookmark to -1,0,0,0", | |
883 | (u_longlong_t)ds->ds_object); | |
884 | } | |
885 | } else if (zap_lookup_int_key(dp->dp_meta_objset, | |
886 | scn->scn_phys.scn_queue_obj, ds->ds_object, &mintxg) == 0) { | |
d683ddbb | 887 | ASSERT3U(dsl_dataset_phys(ds)->ds_num_children, <=, 1); |
428870ff BB |
888 | VERIFY3U(0, ==, zap_remove_int(dp->dp_meta_objset, |
889 | scn->scn_phys.scn_queue_obj, ds->ds_object, tx)); | |
0c66c32d | 890 | if (ds->ds_is_snapshot) { |
428870ff BB |
891 | /* |
892 | * We keep the same mintxg; it could be > | |
893 | * ds_creation_txg if the previous snapshot was | |
894 | * deleted too. | |
895 | */ | |
896 | VERIFY(zap_add_int_key(dp->dp_meta_objset, | |
897 | scn->scn_phys.scn_queue_obj, | |
d683ddbb JG |
898 | dsl_dataset_phys(ds)->ds_next_snap_obj, |
899 | mintxg, tx) == 0); | |
428870ff BB |
900 | zfs_dbgmsg("destroying ds %llu; in queue; " |
901 | "replacing with %llu", | |
902 | (u_longlong_t)ds->ds_object, | |
d683ddbb JG |
903 | (u_longlong_t)dsl_dataset_phys(ds)-> |
904 | ds_next_snap_obj); | |
428870ff BB |
905 | } else { |
906 | zfs_dbgmsg("destroying ds %llu; in queue; removing", | |
907 | (u_longlong_t)ds->ds_object); | |
908 | } | |
909 | } else { | |
910 | zfs_dbgmsg("destroying ds %llu; ignoring", | |
911 | (u_longlong_t)ds->ds_object); | |
912 | } | |
913 | ||
914 | /* | |
915 | * dsl_scan_sync() should be called after this, and should sync | |
916 | * out our changed state, but just to be safe, do it here. | |
917 | */ | |
918 | dsl_scan_sync_state(scn, tx); | |
919 | } | |
920 | ||
921 | void | |
922 | dsl_scan_ds_snapshotted(dsl_dataset_t *ds, dmu_tx_t *tx) | |
923 | { | |
924 | dsl_pool_t *dp = ds->ds_dir->dd_pool; | |
925 | dsl_scan_t *scn = dp->dp_scan; | |
926 | uint64_t mintxg; | |
927 | ||
928 | if (scn->scn_phys.scn_state != DSS_SCANNING) | |
929 | return; | |
930 | ||
d683ddbb | 931 | ASSERT(dsl_dataset_phys(ds)->ds_prev_snap_obj != 0); |
428870ff BB |
932 | |
933 | if (scn->scn_phys.scn_bookmark.zb_objset == ds->ds_object) { | |
934 | scn->scn_phys.scn_bookmark.zb_objset = | |
d683ddbb | 935 | dsl_dataset_phys(ds)->ds_prev_snap_obj; |
428870ff BB |
936 | zfs_dbgmsg("snapshotting ds %llu; currently traversing; " |
937 | "reset zb_objset to %llu", | |
938 | (u_longlong_t)ds->ds_object, | |
d683ddbb | 939 | (u_longlong_t)dsl_dataset_phys(ds)->ds_prev_snap_obj); |
428870ff BB |
940 | } else if (zap_lookup_int_key(dp->dp_meta_objset, |
941 | scn->scn_phys.scn_queue_obj, ds->ds_object, &mintxg) == 0) { | |
942 | VERIFY3U(0, ==, zap_remove_int(dp->dp_meta_objset, | |
943 | scn->scn_phys.scn_queue_obj, ds->ds_object, tx)); | |
944 | VERIFY(zap_add_int_key(dp->dp_meta_objset, | |
945 | scn->scn_phys.scn_queue_obj, | |
d683ddbb | 946 | dsl_dataset_phys(ds)->ds_prev_snap_obj, mintxg, tx) == 0); |
428870ff BB |
947 | zfs_dbgmsg("snapshotting ds %llu; in queue; " |
948 | "replacing with %llu", | |
949 | (u_longlong_t)ds->ds_object, | |
d683ddbb | 950 | (u_longlong_t)dsl_dataset_phys(ds)->ds_prev_snap_obj); |
428870ff BB |
951 | } |
952 | dsl_scan_sync_state(scn, tx); | |
953 | } | |
954 | ||
955 | void | |
956 | dsl_scan_ds_clone_swapped(dsl_dataset_t *ds1, dsl_dataset_t *ds2, dmu_tx_t *tx) | |
957 | { | |
958 | dsl_pool_t *dp = ds1->ds_dir->dd_pool; | |
959 | dsl_scan_t *scn = dp->dp_scan; | |
960 | uint64_t mintxg; | |
961 | ||
962 | if (scn->scn_phys.scn_state != DSS_SCANNING) | |
963 | return; | |
964 | ||
965 | if (scn->scn_phys.scn_bookmark.zb_objset == ds1->ds_object) { | |
966 | scn->scn_phys.scn_bookmark.zb_objset = ds2->ds_object; | |
967 | zfs_dbgmsg("clone_swap ds %llu; currently traversing; " | |
968 | "reset zb_objset to %llu", | |
969 | (u_longlong_t)ds1->ds_object, | |
970 | (u_longlong_t)ds2->ds_object); | |
971 | } else if (scn->scn_phys.scn_bookmark.zb_objset == ds2->ds_object) { | |
972 | scn->scn_phys.scn_bookmark.zb_objset = ds1->ds_object; | |
973 | zfs_dbgmsg("clone_swap ds %llu; currently traversing; " | |
974 | "reset zb_objset to %llu", | |
975 | (u_longlong_t)ds2->ds_object, | |
976 | (u_longlong_t)ds1->ds_object); | |
977 | } | |
978 | ||
979 | if (zap_lookup_int_key(dp->dp_meta_objset, scn->scn_phys.scn_queue_obj, | |
980 | ds1->ds_object, &mintxg) == 0) { | |
981 | int err; | |
982 | ||
d683ddbb JG |
983 | ASSERT3U(mintxg, ==, dsl_dataset_phys(ds1)->ds_prev_snap_txg); |
984 | ASSERT3U(mintxg, ==, dsl_dataset_phys(ds2)->ds_prev_snap_txg); | |
428870ff BB |
985 | VERIFY3U(0, ==, zap_remove_int(dp->dp_meta_objset, |
986 | scn->scn_phys.scn_queue_obj, ds1->ds_object, tx)); | |
987 | err = zap_add_int_key(dp->dp_meta_objset, | |
988 | scn->scn_phys.scn_queue_obj, ds2->ds_object, mintxg, tx); | |
989 | VERIFY(err == 0 || err == EEXIST); | |
990 | if (err == EEXIST) { | |
991 | /* Both were there to begin with */ | |
992 | VERIFY(0 == zap_add_int_key(dp->dp_meta_objset, | |
993 | scn->scn_phys.scn_queue_obj, | |
994 | ds1->ds_object, mintxg, tx)); | |
995 | } | |
996 | zfs_dbgmsg("clone_swap ds %llu; in queue; " | |
997 | "replacing with %llu", | |
998 | (u_longlong_t)ds1->ds_object, | |
999 | (u_longlong_t)ds2->ds_object); | |
1000 | } else if (zap_lookup_int_key(dp->dp_meta_objset, | |
1001 | scn->scn_phys.scn_queue_obj, ds2->ds_object, &mintxg) == 0) { | |
d683ddbb JG |
1002 | ASSERT3U(mintxg, ==, dsl_dataset_phys(ds1)->ds_prev_snap_txg); |
1003 | ASSERT3U(mintxg, ==, dsl_dataset_phys(ds2)->ds_prev_snap_txg); | |
428870ff BB |
1004 | VERIFY3U(0, ==, zap_remove_int(dp->dp_meta_objset, |
1005 | scn->scn_phys.scn_queue_obj, ds2->ds_object, tx)); | |
1006 | VERIFY(0 == zap_add_int_key(dp->dp_meta_objset, | |
1007 | scn->scn_phys.scn_queue_obj, ds1->ds_object, mintxg, tx)); | |
1008 | zfs_dbgmsg("clone_swap ds %llu; in queue; " | |
1009 | "replacing with %llu", | |
1010 | (u_longlong_t)ds2->ds_object, | |
1011 | (u_longlong_t)ds1->ds_object); | |
1012 | } | |
1013 | ||
1014 | dsl_scan_sync_state(scn, tx); | |
1015 | } | |
1016 | ||
1017 | struct enqueue_clones_arg { | |
1018 | dmu_tx_t *tx; | |
1019 | uint64_t originobj; | |
1020 | }; | |
1021 | ||
1022 | /* ARGSUSED */ | |
1023 | static int | |
13fe0198 | 1024 | enqueue_clones_cb(dsl_pool_t *dp, dsl_dataset_t *hds, void *arg) |
428870ff BB |
1025 | { |
1026 | struct enqueue_clones_arg *eca = arg; | |
1027 | dsl_dataset_t *ds; | |
1028 | int err; | |
428870ff BB |
1029 | dsl_scan_t *scn = dp->dp_scan; |
1030 | ||
d683ddbb | 1031 | if (dsl_dir_phys(hds->ds_dir)->dd_origin_obj != eca->originobj) |
13fe0198 MA |
1032 | return (0); |
1033 | ||
1034 | err = dsl_dataset_hold_obj(dp, hds->ds_object, FTAG, &ds); | |
428870ff BB |
1035 | if (err) |
1036 | return (err); | |
1037 | ||
d683ddbb | 1038 | while (dsl_dataset_phys(ds)->ds_prev_snap_obj != eca->originobj) { |
13fe0198 MA |
1039 | dsl_dataset_t *prev; |
1040 | err = dsl_dataset_hold_obj(dp, | |
d683ddbb | 1041 | dsl_dataset_phys(ds)->ds_prev_snap_obj, FTAG, &prev); |
428870ff | 1042 | |
13fe0198 MA |
1043 | dsl_dataset_rele(ds, FTAG); |
1044 | if (err) | |
1045 | return (err); | |
1046 | ds = prev; | |
428870ff | 1047 | } |
13fe0198 MA |
1048 | VERIFY(zap_add_int_key(dp->dp_meta_objset, |
1049 | scn->scn_phys.scn_queue_obj, ds->ds_object, | |
d683ddbb | 1050 | dsl_dataset_phys(ds)->ds_prev_snap_txg, eca->tx) == 0); |
428870ff BB |
1051 | dsl_dataset_rele(ds, FTAG); |
1052 | return (0); | |
1053 | } | |
1054 | ||
1055 | static void | |
1056 | dsl_scan_visitds(dsl_scan_t *scn, uint64_t dsobj, dmu_tx_t *tx) | |
1057 | { | |
1058 | dsl_pool_t *dp = scn->scn_dp; | |
1059 | dsl_dataset_t *ds; | |
572e2857 | 1060 | objset_t *os; |
d6320ddb | 1061 | char *dsname; |
428870ff BB |
1062 | |
1063 | VERIFY3U(0, ==, dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds)); | |
1064 | ||
572e2857 BB |
1065 | if (dmu_objset_from_ds(ds, &os)) |
1066 | goto out; | |
1067 | ||
1068 | /* | |
1069 | * Only the ZIL in the head (non-snapshot) is valid. Even though | |
1070 | * snapshots can have ZIL block pointers (which may be the same | |
1071 | * BP as in the head), they must be ignored. So we traverse the | |
1072 | * ZIL here, rather than in scan_recurse(), because the regular | |
1073 | * snapshot block-sharing rules don't apply to it. | |
1074 | */ | |
0c66c32d | 1075 | if (DSL_SCAN_IS_SCRUB_RESILVER(scn) && !ds->ds_is_snapshot) |
572e2857 BB |
1076 | dsl_scan_zil(dp, &os->os_zil_header); |
1077 | ||
428870ff BB |
1078 | /* |
1079 | * Iterate over the bps in this ds. | |
1080 | */ | |
1081 | dmu_buf_will_dirty(ds->ds_dbuf, tx); | |
d683ddbb | 1082 | dsl_scan_visit_rootbp(scn, ds, &dsl_dataset_phys(ds)->ds_bp, tx); |
428870ff | 1083 | |
79c76d5b | 1084 | dsname = kmem_alloc(ZFS_MAXNAMELEN, KM_SLEEP); |
428870ff BB |
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 | */ | |
d683ddbb | 1116 | if (dsl_dataset_phys(ds)->ds_next_snap_obj != 0) { |
428870ff | 1117 | VERIFY(zap_add_int_key(dp->dp_meta_objset, |
d683ddbb JG |
1118 | scn->scn_phys.scn_queue_obj, |
1119 | dsl_dataset_phys(ds)->ds_next_snap_obj, | |
1120 | dsl_dataset_phys(ds)->ds_creation_txg, tx) == 0); | |
428870ff | 1121 | } |
d683ddbb | 1122 | if (dsl_dataset_phys(ds)->ds_num_children > 1) { |
428870ff | 1123 | boolean_t usenext = B_FALSE; |
d683ddbb | 1124 | if (dsl_dataset_phys(ds)->ds_next_clones_obj != 0) { |
428870ff BB |
1125 | uint64_t count; |
1126 | /* | |
1127 | * A bug in a previous version of the code could | |
1128 | * cause upgrade_clones_cb() to not set | |
1129 | * ds_next_snap_obj when it should, leading to a | |
1130 | * missing entry. Therefore we can only use the | |
1131 | * next_clones_obj when its count is correct. | |
1132 | */ | |
1133 | int err = zap_count(dp->dp_meta_objset, | |
d683ddbb | 1134 | dsl_dataset_phys(ds)->ds_next_clones_obj, &count); |
428870ff | 1135 | if (err == 0 && |
d683ddbb | 1136 | count == dsl_dataset_phys(ds)->ds_num_children - 1) |
428870ff BB |
1137 | usenext = B_TRUE; |
1138 | } | |
1139 | ||
1140 | if (usenext) { | |
13fe0198 | 1141 | VERIFY0(zap_join_key(dp->dp_meta_objset, |
d683ddbb | 1142 | dsl_dataset_phys(ds)->ds_next_clones_obj, |
428870ff | 1143 | scn->scn_phys.scn_queue_obj, |
d683ddbb | 1144 | dsl_dataset_phys(ds)->ds_creation_txg, tx)); |
428870ff BB |
1145 | } else { |
1146 | struct enqueue_clones_arg eca; | |
1147 | eca.tx = tx; | |
1148 | eca.originobj = ds->ds_object; | |
1149 | ||
13fe0198 MA |
1150 | VERIFY0(dmu_objset_find_dp(dp, dp->dp_root_dir_obj, |
1151 | enqueue_clones_cb, &eca, DS_FIND_CHILDREN)); | |
428870ff BB |
1152 | } |
1153 | } | |
1154 | ||
1155 | out: | |
1156 | dsl_dataset_rele(ds, FTAG); | |
1157 | } | |
1158 | ||
1159 | /* ARGSUSED */ | |
1160 | static int | |
13fe0198 | 1161 | enqueue_cb(dsl_pool_t *dp, dsl_dataset_t *hds, void *arg) |
428870ff BB |
1162 | { |
1163 | dmu_tx_t *tx = arg; | |
1164 | dsl_dataset_t *ds; | |
1165 | int err; | |
428870ff BB |
1166 | dsl_scan_t *scn = dp->dp_scan; |
1167 | ||
13fe0198 | 1168 | err = dsl_dataset_hold_obj(dp, hds->ds_object, FTAG, &ds); |
428870ff BB |
1169 | if (err) |
1170 | return (err); | |
1171 | ||
d683ddbb | 1172 | while (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) { |
428870ff | 1173 | dsl_dataset_t *prev; |
d683ddbb JG |
1174 | err = dsl_dataset_hold_obj(dp, |
1175 | dsl_dataset_phys(ds)->ds_prev_snap_obj, FTAG, &prev); | |
428870ff BB |
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 | */ | |
d683ddbb | 1184 | if (dsl_dataset_phys(prev)->ds_next_snap_obj != ds->ds_object) { |
428870ff BB |
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, | |
d683ddbb | 1194 | ds->ds_object, dsl_dataset_phys(ds)->ds_prev_snap_txg, tx) == 0); |
428870ff BB |
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; | |
2598c001 | 1236 | ddt_entry_t dde; |
428870ff BB |
1237 | int error; |
1238 | uint64_t n = 0; | |
1239 | ||
2598c001 BB |
1240 | bzero(&dde, sizeof (ddt_entry_t)); |
1241 | ||
428870ff BB |
1242 | while ((error = ddt_walk(scn->scn_dp->dp_spa, ddb, &dde)) == 0) { |
1243 | ddt_t *ddt; | |
1244 | ||
1245 | if (ddb->ddb_class > scn->scn_phys.scn_ddt_class_max) | |
1246 | break; | |
1247 | dprintf("visiting ddb=%llu/%llu/%llu/%llx\n", | |
1248 | (longlong_t)ddb->ddb_class, | |
1249 | (longlong_t)ddb->ddb_type, | |
1250 | (longlong_t)ddb->ddb_checksum, | |
1251 | (longlong_t)ddb->ddb_cursor); | |
1252 | ||
1253 | /* There should be no pending changes to the dedup table */ | |
1254 | ddt = scn->scn_dp->dp_spa->spa_ddt[ddb->ddb_checksum]; | |
1255 | ASSERT(avl_first(&ddt->ddt_tree) == NULL); | |
1256 | ||
1257 | dsl_scan_ddt_entry(scn, ddb->ddb_checksum, &dde, tx); | |
1258 | n++; | |
1259 | ||
1260 | if (dsl_scan_check_pause(scn, NULL)) | |
1261 | break; | |
1262 | } | |
1263 | ||
1264 | zfs_dbgmsg("scanned %llu ddt entries with class_max = %u; pausing=%u", | |
1265 | (longlong_t)n, (int)scn->scn_phys.scn_ddt_class_max, | |
1266 | (int)scn->scn_pausing); | |
1267 | ||
1268 | ASSERT(error == 0 || error == ENOENT); | |
1269 | ASSERT(error != ENOENT || | |
1270 | ddb->ddb_class > scn->scn_phys.scn_ddt_class_max); | |
1271 | } | |
1272 | ||
1273 | /* ARGSUSED */ | |
1274 | void | |
1275 | dsl_scan_ddt_entry(dsl_scan_t *scn, enum zio_checksum checksum, | |
1276 | ddt_entry_t *dde, dmu_tx_t *tx) | |
1277 | { | |
1278 | const ddt_key_t *ddk = &dde->dde_key; | |
1279 | ddt_phys_t *ddp = dde->dde_phys; | |
1280 | blkptr_t bp; | |
5dbd68a3 | 1281 | zbookmark_phys_t zb = { 0 }; |
d6320ddb | 1282 | int p; |
428870ff BB |
1283 | |
1284 | if (scn->scn_phys.scn_state != DSS_SCANNING) | |
1285 | return; | |
1286 | ||
d6320ddb | 1287 | for (p = 0; p < DDT_PHYS_TYPES; p++, ddp++) { |
428870ff | 1288 | if (ddp->ddp_phys_birth == 0 || |
5d1f7fb6 | 1289 | ddp->ddp_phys_birth > scn->scn_phys.scn_max_txg) |
428870ff BB |
1290 | continue; |
1291 | ddt_bp_create(checksum, ddk, ddp, &bp); | |
1292 | ||
1293 | scn->scn_visited_this_txg++; | |
1294 | scan_funcs[scn->scn_phys.scn_func](scn->scn_dp, &bp, &zb); | |
1295 | } | |
1296 | } | |
1297 | ||
1298 | static void | |
1299 | dsl_scan_visit(dsl_scan_t *scn, dmu_tx_t *tx) | |
1300 | { | |
1301 | dsl_pool_t *dp = scn->scn_dp; | |
40a39e11 BB |
1302 | zap_cursor_t *zc; |
1303 | zap_attribute_t *za; | |
428870ff BB |
1304 | |
1305 | if (scn->scn_phys.scn_ddt_bookmark.ddb_class <= | |
1306 | scn->scn_phys.scn_ddt_class_max) { | |
1307 | scn->scn_phys.scn_cur_min_txg = scn->scn_phys.scn_min_txg; | |
1308 | scn->scn_phys.scn_cur_max_txg = scn->scn_phys.scn_max_txg; | |
1309 | dsl_scan_ddt(scn, tx); | |
1310 | if (scn->scn_pausing) | |
1311 | return; | |
1312 | } | |
1313 | ||
1314 | if (scn->scn_phys.scn_bookmark.zb_objset == DMU_META_OBJSET) { | |
1315 | /* First do the MOS & ORIGIN */ | |
1316 | ||
1317 | scn->scn_phys.scn_cur_min_txg = scn->scn_phys.scn_min_txg; | |
1318 | scn->scn_phys.scn_cur_max_txg = scn->scn_phys.scn_max_txg; | |
1319 | dsl_scan_visit_rootbp(scn, NULL, | |
1320 | &dp->dp_meta_rootbp, tx); | |
1321 | spa_set_rootblkptr(dp->dp_spa, &dp->dp_meta_rootbp); | |
1322 | if (scn->scn_pausing) | |
1323 | return; | |
1324 | ||
1325 | if (spa_version(dp->dp_spa) < SPA_VERSION_DSL_SCRUB) { | |
13fe0198 MA |
1326 | VERIFY0(dmu_objset_find_dp(dp, dp->dp_root_dir_obj, |
1327 | enqueue_cb, tx, DS_FIND_CHILDREN)); | |
428870ff BB |
1328 | } else { |
1329 | dsl_scan_visitds(scn, | |
1330 | dp->dp_origin_snap->ds_object, tx); | |
1331 | } | |
1332 | ASSERT(!scn->scn_pausing); | |
1333 | } else if (scn->scn_phys.scn_bookmark.zb_objset != | |
1334 | ZB_DESTROYED_OBJSET) { | |
1335 | /* | |
1336 | * If we were paused, continue from here. Note if the | |
1337 | * ds we were paused on was deleted, the zb_objset may | |
1338 | * be -1, so we will skip this and find a new objset | |
1339 | * below. | |
1340 | */ | |
1341 | dsl_scan_visitds(scn, scn->scn_phys.scn_bookmark.zb_objset, tx); | |
1342 | if (scn->scn_pausing) | |
1343 | return; | |
1344 | } | |
1345 | ||
1346 | /* | |
1347 | * In case we were paused right at the end of the ds, zero the | |
1348 | * bookmark so we don't think that we're still trying to resume. | |
1349 | */ | |
5dbd68a3 | 1350 | bzero(&scn->scn_phys.scn_bookmark, sizeof (zbookmark_phys_t)); |
79c76d5b BB |
1351 | zc = kmem_alloc(sizeof (zap_cursor_t), KM_SLEEP); |
1352 | za = kmem_alloc(sizeof (zap_attribute_t), KM_SLEEP); | |
428870ff BB |
1353 | |
1354 | /* keep pulling things out of the zap-object-as-queue */ | |
40a39e11 | 1355 | while (zap_cursor_init(zc, dp->dp_meta_objset, |
428870ff | 1356 | scn->scn_phys.scn_queue_obj), |
40a39e11 | 1357 | zap_cursor_retrieve(zc, za) == 0) { |
428870ff BB |
1358 | dsl_dataset_t *ds; |
1359 | uint64_t dsobj; | |
1360 | ||
40a39e11 | 1361 | dsobj = strtonum(za->za_name, NULL); |
428870ff BB |
1362 | VERIFY3U(0, ==, zap_remove_int(dp->dp_meta_objset, |
1363 | scn->scn_phys.scn_queue_obj, dsobj, tx)); | |
1364 | ||
1365 | /* Set up min/max txg */ | |
1366 | VERIFY3U(0, ==, dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds)); | |
40a39e11 | 1367 | if (za->za_first_integer != 0) { |
428870ff BB |
1368 | scn->scn_phys.scn_cur_min_txg = |
1369 | MAX(scn->scn_phys.scn_min_txg, | |
40a39e11 | 1370 | za->za_first_integer); |
428870ff BB |
1371 | } else { |
1372 | scn->scn_phys.scn_cur_min_txg = | |
1373 | MAX(scn->scn_phys.scn_min_txg, | |
d683ddbb | 1374 | dsl_dataset_phys(ds)->ds_prev_snap_txg); |
428870ff BB |
1375 | } |
1376 | scn->scn_phys.scn_cur_max_txg = dsl_scan_ds_maxtxg(ds); | |
1377 | dsl_dataset_rele(ds, FTAG); | |
1378 | ||
1379 | dsl_scan_visitds(scn, dsobj, tx); | |
40a39e11 | 1380 | zap_cursor_fini(zc); |
428870ff | 1381 | if (scn->scn_pausing) |
40a39e11 | 1382 | goto out; |
428870ff | 1383 | } |
40a39e11 BB |
1384 | zap_cursor_fini(zc); |
1385 | out: | |
d1d7e268 MK |
1386 | kmem_free(za, sizeof (zap_attribute_t)); |
1387 | kmem_free(zc, sizeof (zap_cursor_t)); | |
428870ff BB |
1388 | } |
1389 | ||
9ae529ec CS |
1390 | static boolean_t |
1391 | dsl_scan_free_should_pause(dsl_scan_t *scn) | |
428870ff | 1392 | { |
428870ff BB |
1393 | uint64_t elapsed_nanosecs; |
1394 | ||
78e2739d MA |
1395 | if (zfs_recover) |
1396 | return (B_FALSE); | |
1397 | ||
36283ca2 MG |
1398 | if (scn->scn_visited_this_txg >= zfs_free_max_blocks) |
1399 | return (B_TRUE); | |
1400 | ||
428870ff | 1401 | elapsed_nanosecs = gethrtime() - scn->scn_sync_start_time; |
9ae529ec | 1402 | return (elapsed_nanosecs / NANOSEC > zfs_txg_timeout || |
63fd3c6c | 1403 | (NSEC2MSEC(elapsed_nanosecs) > zfs_free_min_time_ms && |
428870ff | 1404 | txg_sync_waiting(scn->scn_dp)) || |
9ae529ec CS |
1405 | spa_shutting_down(scn->scn_dp->dp_spa)); |
1406 | } | |
1407 | ||
1408 | static int | |
1409 | dsl_scan_free_block_cb(void *arg, const blkptr_t *bp, dmu_tx_t *tx) | |
1410 | { | |
1411 | dsl_scan_t *scn = arg; | |
1412 | ||
1413 | if (!scn->scn_is_bptree || | |
1414 | (BP_GET_LEVEL(bp) == 0 && BP_GET_TYPE(bp) != DMU_OT_OBJSET)) { | |
1415 | if (dsl_scan_free_should_pause(scn)) | |
2e528b49 | 1416 | return (SET_ERROR(ERESTART)); |
9ae529ec | 1417 | } |
428870ff BB |
1418 | |
1419 | zio_nowait(zio_free_sync(scn->scn_zio_root, scn->scn_dp->dp_spa, | |
1420 | dmu_tx_get_txg(tx), bp, 0)); | |
1421 | dsl_dir_diduse_space(tx->tx_pool->dp_free_dir, DD_USED_HEAD, | |
1422 | -bp_get_dsize_sync(scn->scn_dp->dp_spa, bp), | |
1423 | -BP_GET_PSIZE(bp), -BP_GET_UCSIZE(bp), tx); | |
1424 | scn->scn_visited_this_txg++; | |
1425 | return (0); | |
1426 | } | |
1427 | ||
1428 | boolean_t | |
1429 | dsl_scan_active(dsl_scan_t *scn) | |
1430 | { | |
1431 | spa_t *spa = scn->scn_dp->dp_spa; | |
1432 | uint64_t used = 0, comp, uncomp; | |
1433 | ||
1434 | if (spa->spa_load_state != SPA_LOAD_NONE) | |
1435 | return (B_FALSE); | |
1436 | if (spa_shutting_down(spa)) | |
1437 | return (B_FALSE); | |
2696dfaf | 1438 | if (scn->scn_phys.scn_state == DSS_SCANNING || |
fbeddd60 | 1439 | (scn->scn_async_destroying && !scn->scn_async_stalled)) |
428870ff BB |
1440 | return (B_TRUE); |
1441 | ||
1442 | if (spa_version(scn->scn_dp->dp_spa) >= SPA_VERSION_DEADLISTS) { | |
1443 | (void) bpobj_space(&scn->scn_dp->dp_free_bpobj, | |
1444 | &used, &comp, &uncomp); | |
1445 | } | |
1446 | return (used != 0); | |
1447 | } | |
1448 | ||
1449 | void | |
1450 | dsl_scan_sync(dsl_pool_t *dp, dmu_tx_t *tx) | |
1451 | { | |
1452 | dsl_scan_t *scn = dp->dp_scan; | |
1453 | spa_t *spa = dp->dp_spa; | |
fbeddd60 | 1454 | int err = 0; |
428870ff BB |
1455 | |
1456 | /* | |
1457 | * Check for scn_restart_txg before checking spa_load_state, so | |
1458 | * that we can restart an old-style scan while the pool is being | |
1459 | * imported (see dsl_scan_init). | |
1460 | */ | |
1461 | if (scn->scn_restart_txg != 0 && | |
1462 | scn->scn_restart_txg <= tx->tx_txg) { | |
1463 | pool_scan_func_t func = POOL_SCAN_SCRUB; | |
1464 | dsl_scan_done(scn, B_FALSE, tx); | |
1465 | if (vdev_resilver_needed(spa->spa_root_vdev, NULL, NULL)) | |
1466 | func = POOL_SCAN_RESILVER; | |
1467 | zfs_dbgmsg("restarting scan func=%u txg=%llu", | |
1468 | func, tx->tx_txg); | |
13fe0198 | 1469 | dsl_scan_setup_sync(&func, tx); |
428870ff BB |
1470 | } |
1471 | ||
fbeddd60 MA |
1472 | /* |
1473 | * If the scan is inactive due to a stalled async destroy, try again. | |
1474 | */ | |
1475 | if ((!scn->scn_async_stalled && !dsl_scan_active(scn)) || | |
428870ff BB |
1476 | spa_sync_pass(dp->dp_spa) > 1) |
1477 | return; | |
1478 | ||
1479 | scn->scn_visited_this_txg = 0; | |
1480 | scn->scn_pausing = B_FALSE; | |
1481 | scn->scn_sync_start_time = gethrtime(); | |
1482 | spa->spa_scrub_active = B_TRUE; | |
1483 | ||
1484 | /* | |
fbeddd60 MA |
1485 | * First process the async destroys. If we pause, don't do |
1486 | * any scrubbing or resilvering. This ensures that there are no | |
1487 | * async destroys while we are scanning, so the scan code doesn't | |
1488 | * have to worry about traversing it. It is also faster to free the | |
1489 | * blocks than to scrub them. | |
428870ff BB |
1490 | */ |
1491 | if (spa_version(dp->dp_spa) >= SPA_VERSION_DEADLISTS) { | |
9ae529ec | 1492 | scn->scn_is_bptree = B_FALSE; |
428870ff BB |
1493 | scn->scn_zio_root = zio_root(dp->dp_spa, NULL, |
1494 | NULL, ZIO_FLAG_MUSTSUCCEED); | |
1495 | err = bpobj_iterate(&dp->dp_free_bpobj, | |
9ae529ec | 1496 | dsl_scan_free_block_cb, scn, tx); |
428870ff | 1497 | VERIFY3U(0, ==, zio_wait(scn->scn_zio_root)); |
9ae529ec | 1498 | |
fbeddd60 MA |
1499 | if (err != 0 && err != ERESTART) |
1500 | zfs_panic_recover("error %u from bpobj_iterate()", err); | |
1501 | } | |
13fe0198 | 1502 | |
fbeddd60 MA |
1503 | if (err == 0 && spa_feature_is_active(spa, SPA_FEATURE_ASYNC_DESTROY)) { |
1504 | ASSERT(scn->scn_async_destroying); | |
1505 | scn->scn_is_bptree = B_TRUE; | |
1506 | scn->scn_zio_root = zio_root(dp->dp_spa, NULL, | |
1507 | NULL, ZIO_FLAG_MUSTSUCCEED); | |
1508 | err = bptree_iterate(dp->dp_meta_objset, | |
1509 | dp->dp_bptree_obj, B_TRUE, dsl_scan_free_block_cb, scn, tx); | |
1510 | VERIFY0(zio_wait(scn->scn_zio_root)); | |
1511 | ||
1512 | if (err == EIO || err == ECKSUM) { | |
1513 | err = 0; | |
1514 | } else if (err != 0 && err != ERESTART) { | |
1515 | zfs_panic_recover("error %u from " | |
1516 | "traverse_dataset_destroyed()", err); | |
9ae529ec | 1517 | } |
fbeddd60 | 1518 | |
fbeddd60 MA |
1519 | if (bptree_is_empty(dp->dp_meta_objset, dp->dp_bptree_obj)) { |
1520 | /* finished; deactivate async destroy feature */ | |
1521 | spa_feature_decr(spa, SPA_FEATURE_ASYNC_DESTROY, tx); | |
1522 | ASSERT(!spa_feature_is_active(spa, | |
1523 | SPA_FEATURE_ASYNC_DESTROY)); | |
1524 | VERIFY0(zap_remove(dp->dp_meta_objset, | |
1525 | DMU_POOL_DIRECTORY_OBJECT, | |
1526 | DMU_POOL_BPTREE_OBJ, tx)); | |
1527 | VERIFY0(bptree_free(dp->dp_meta_objset, | |
1528 | dp->dp_bptree_obj, tx)); | |
1529 | dp->dp_bptree_obj = 0; | |
1530 | scn->scn_async_destroying = B_FALSE; | |
89b1cd65 | 1531 | } else { |
1532 | /* | |
1533 | * If we didn't make progress, mark the async destroy as | |
1534 | * stalled, so that we will not initiate a spa_sync() on | |
1535 | * its behalf. | |
1536 | */ | |
1537 | scn->scn_async_stalled = | |
1538 | (scn->scn_visited_this_txg == 0); | |
428870ff | 1539 | } |
fbeddd60 MA |
1540 | } |
1541 | if (scn->scn_visited_this_txg) { | |
1542 | zfs_dbgmsg("freed %llu blocks in %llums from " | |
1543 | "free_bpobj/bptree txg %llu; err=%u", | |
1544 | (longlong_t)scn->scn_visited_this_txg, | |
1545 | (longlong_t) | |
1546 | NSEC2MSEC(gethrtime() - scn->scn_sync_start_time), | |
1547 | (longlong_t)tx->tx_txg, err); | |
1548 | scn->scn_visited_this_txg = 0; | |
1549 | ||
1550 | /* | |
1551 | * Write out changes to the DDT that may be required as a | |
1552 | * result of the blocks freed. This ensures that the DDT | |
1553 | * is clean when a scrub/resilver runs. | |
1554 | */ | |
1555 | ddt_sync(spa, tx->tx_txg); | |
1556 | } | |
1557 | if (err != 0) | |
1558 | return; | |
1559 | if (!scn->scn_async_destroying && zfs_free_leak_on_eio && | |
d683ddbb JG |
1560 | (dsl_dir_phys(dp->dp_free_dir)->dd_used_bytes != 0 || |
1561 | dsl_dir_phys(dp->dp_free_dir)->dd_compressed_bytes != 0 || | |
1562 | dsl_dir_phys(dp->dp_free_dir)->dd_uncompressed_bytes != 0)) { | |
fbeddd60 MA |
1563 | /* |
1564 | * We have finished background destroying, but there is still | |
1565 | * some space left in the dp_free_dir. Transfer this leaked | |
1566 | * space to the dp_leak_dir. | |
1567 | */ | |
1568 | if (dp->dp_leak_dir == NULL) { | |
1569 | rrw_enter(&dp->dp_config_rwlock, RW_WRITER, FTAG); | |
1570 | (void) dsl_dir_create_sync(dp, dp->dp_root_dir, | |
1571 | LEAK_DIR_NAME, tx); | |
1572 | VERIFY0(dsl_pool_open_special_dir(dp, | |
1573 | LEAK_DIR_NAME, &dp->dp_leak_dir)); | |
1574 | rrw_exit(&dp->dp_config_rwlock, FTAG); | |
1575 | } | |
1576 | dsl_dir_diduse_space(dp->dp_leak_dir, DD_USED_HEAD, | |
d683ddbb JG |
1577 | dsl_dir_phys(dp->dp_free_dir)->dd_used_bytes, |
1578 | dsl_dir_phys(dp->dp_free_dir)->dd_compressed_bytes, | |
1579 | dsl_dir_phys(dp->dp_free_dir)->dd_uncompressed_bytes, tx); | |
fbeddd60 | 1580 | dsl_dir_diduse_space(dp->dp_free_dir, DD_USED_HEAD, |
d683ddbb JG |
1581 | -dsl_dir_phys(dp->dp_free_dir)->dd_used_bytes, |
1582 | -dsl_dir_phys(dp->dp_free_dir)->dd_compressed_bytes, | |
1583 | -dsl_dir_phys(dp->dp_free_dir)->dd_uncompressed_bytes, tx); | |
fbeddd60 MA |
1584 | } |
1585 | if (!scn->scn_async_destroying) { | |
9b67f605 | 1586 | /* finished; verify that space accounting went to zero */ |
d683ddbb JG |
1587 | ASSERT0(dsl_dir_phys(dp->dp_free_dir)->dd_used_bytes); |
1588 | ASSERT0(dsl_dir_phys(dp->dp_free_dir)->dd_compressed_bytes); | |
1589 | ASSERT0(dsl_dir_phys(dp->dp_free_dir)->dd_uncompressed_bytes); | |
428870ff BB |
1590 | } |
1591 | ||
1592 | if (scn->scn_phys.scn_state != DSS_SCANNING) | |
1593 | return; | |
1594 | ||
5d1f7fb6 GW |
1595 | if (scn->scn_done_txg == tx->tx_txg) { |
1596 | ASSERT(!scn->scn_pausing); | |
1597 | /* finished with scan. */ | |
1598 | zfs_dbgmsg("txg %llu scan complete", tx->tx_txg); | |
1599 | dsl_scan_done(scn, B_TRUE, tx); | |
1600 | ASSERT3U(spa->spa_scrub_inflight, ==, 0); | |
1601 | dsl_scan_sync_state(scn, tx); | |
1602 | return; | |
1603 | } | |
1604 | ||
428870ff BB |
1605 | if (scn->scn_phys.scn_ddt_bookmark.ddb_class <= |
1606 | scn->scn_phys.scn_ddt_class_max) { | |
1607 | zfs_dbgmsg("doing scan sync txg %llu; " | |
1608 | "ddt bm=%llu/%llu/%llu/%llx", | |
1609 | (longlong_t)tx->tx_txg, | |
1610 | (longlong_t)scn->scn_phys.scn_ddt_bookmark.ddb_class, | |
1611 | (longlong_t)scn->scn_phys.scn_ddt_bookmark.ddb_type, | |
1612 | (longlong_t)scn->scn_phys.scn_ddt_bookmark.ddb_checksum, | |
1613 | (longlong_t)scn->scn_phys.scn_ddt_bookmark.ddb_cursor); | |
1614 | ASSERT(scn->scn_phys.scn_bookmark.zb_objset == 0); | |
1615 | ASSERT(scn->scn_phys.scn_bookmark.zb_object == 0); | |
1616 | ASSERT(scn->scn_phys.scn_bookmark.zb_level == 0); | |
1617 | ASSERT(scn->scn_phys.scn_bookmark.zb_blkid == 0); | |
1618 | } else { | |
1619 | zfs_dbgmsg("doing scan sync txg %llu; bm=%llu/%llu/%llu/%llu", | |
1620 | (longlong_t)tx->tx_txg, | |
1621 | (longlong_t)scn->scn_phys.scn_bookmark.zb_objset, | |
1622 | (longlong_t)scn->scn_phys.scn_bookmark.zb_object, | |
1623 | (longlong_t)scn->scn_phys.scn_bookmark.zb_level, | |
1624 | (longlong_t)scn->scn_phys.scn_bookmark.zb_blkid); | |
1625 | } | |
1626 | ||
1627 | scn->scn_zio_root = zio_root(dp->dp_spa, NULL, | |
1628 | NULL, ZIO_FLAG_CANFAIL); | |
13fe0198 | 1629 | dsl_pool_config_enter(dp, FTAG); |
428870ff | 1630 | dsl_scan_visit(scn, tx); |
13fe0198 | 1631 | dsl_pool_config_exit(dp, FTAG); |
428870ff BB |
1632 | (void) zio_wait(scn->scn_zio_root); |
1633 | scn->scn_zio_root = NULL; | |
1634 | ||
1635 | zfs_dbgmsg("visited %llu blocks in %llums", | |
1636 | (longlong_t)scn->scn_visited_this_txg, | |
63fd3c6c | 1637 | (longlong_t)NSEC2MSEC(gethrtime() - scn->scn_sync_start_time)); |
428870ff BB |
1638 | |
1639 | if (!scn->scn_pausing) { | |
5d1f7fb6 GW |
1640 | scn->scn_done_txg = tx->tx_txg + 1; |
1641 | zfs_dbgmsg("txg %llu traversal complete, waiting till txg %llu", | |
1642 | tx->tx_txg, scn->scn_done_txg); | |
428870ff BB |
1643 | } |
1644 | ||
1645 | if (DSL_SCAN_IS_SCRUB_RESILVER(scn)) { | |
1646 | mutex_enter(&spa->spa_scrub_lock); | |
1647 | while (spa->spa_scrub_inflight > 0) { | |
1648 | cv_wait(&spa->spa_scrub_io_cv, | |
1649 | &spa->spa_scrub_lock); | |
1650 | } | |
1651 | mutex_exit(&spa->spa_scrub_lock); | |
1652 | } | |
1653 | ||
1654 | dsl_scan_sync_state(scn, tx); | |
1655 | } | |
1656 | ||
1657 | /* | |
1658 | * This will start a new scan, or restart an existing one. | |
1659 | */ | |
1660 | void | |
1661 | dsl_resilver_restart(dsl_pool_t *dp, uint64_t txg) | |
1662 | { | |
1663 | if (txg == 0) { | |
1664 | dmu_tx_t *tx; | |
1665 | tx = dmu_tx_create_dd(dp->dp_mos_dir); | |
1666 | VERIFY(0 == dmu_tx_assign(tx, TXG_WAIT)); | |
1667 | ||
1668 | txg = dmu_tx_get_txg(tx); | |
1669 | dp->dp_scan->scn_restart_txg = txg; | |
1670 | dmu_tx_commit(tx); | |
1671 | } else { | |
1672 | dp->dp_scan->scn_restart_txg = txg; | |
1673 | } | |
1674 | zfs_dbgmsg("restarting resilver txg=%llu", txg); | |
1675 | } | |
1676 | ||
1677 | boolean_t | |
1678 | dsl_scan_resilvering(dsl_pool_t *dp) | |
1679 | { | |
1680 | return (dp->dp_scan->scn_phys.scn_state == DSS_SCANNING && | |
1681 | dp->dp_scan->scn_phys.scn_func == POOL_SCAN_RESILVER); | |
1682 | } | |
1683 | ||
1684 | /* | |
1685 | * scrub consumers | |
1686 | */ | |
1687 | ||
1688 | static void | |
1689 | count_block(zfs_all_blkstats_t *zab, const blkptr_t *bp) | |
1690 | { | |
1691 | int i; | |
1692 | ||
1693 | /* | |
1694 | * If we resume after a reboot, zab will be NULL; don't record | |
1695 | * incomplete stats in that case. | |
1696 | */ | |
1697 | if (zab == NULL) | |
1698 | return; | |
1699 | ||
1700 | for (i = 0; i < 4; i++) { | |
1701 | int l = (i < 2) ? BP_GET_LEVEL(bp) : DN_MAX_LEVELS; | |
1702 | int t = (i & 1) ? BP_GET_TYPE(bp) : DMU_OT_TOTAL; | |
428870ff | 1703 | int equal; |
9ae529ec CS |
1704 | zfs_blkstat_t *zb; |
1705 | ||
1706 | if (t & DMU_OT_NEWTYPE) | |
1707 | t = DMU_OT_OTHER; | |
428870ff | 1708 | |
9ae529ec | 1709 | zb = &zab->zab_type[l][t]; |
428870ff BB |
1710 | zb->zb_count++; |
1711 | zb->zb_asize += BP_GET_ASIZE(bp); | |
1712 | zb->zb_lsize += BP_GET_LSIZE(bp); | |
1713 | zb->zb_psize += BP_GET_PSIZE(bp); | |
1714 | zb->zb_gangs += BP_COUNT_GANG(bp); | |
1715 | ||
1716 | switch (BP_GET_NDVAS(bp)) { | |
1717 | case 2: | |
1718 | if (DVA_GET_VDEV(&bp->blk_dva[0]) == | |
1719 | DVA_GET_VDEV(&bp->blk_dva[1])) | |
1720 | zb->zb_ditto_2_of_2_samevdev++; | |
1721 | break; | |
1722 | case 3: | |
1723 | equal = (DVA_GET_VDEV(&bp->blk_dva[0]) == | |
1724 | DVA_GET_VDEV(&bp->blk_dva[1])) + | |
1725 | (DVA_GET_VDEV(&bp->blk_dva[0]) == | |
1726 | DVA_GET_VDEV(&bp->blk_dva[2])) + | |
1727 | (DVA_GET_VDEV(&bp->blk_dva[1]) == | |
1728 | DVA_GET_VDEV(&bp->blk_dva[2])); | |
1729 | if (equal == 1) | |
1730 | zb->zb_ditto_2_of_3_samevdev++; | |
1731 | else if (equal == 3) | |
1732 | zb->zb_ditto_3_of_3_samevdev++; | |
1733 | break; | |
1734 | } | |
1735 | } | |
1736 | } | |
1737 | ||
1738 | static void | |
1739 | dsl_scan_scrub_done(zio_t *zio) | |
1740 | { | |
1741 | spa_t *spa = zio->io_spa; | |
1742 | ||
1743 | zio_data_buf_free(zio->io_data, zio->io_size); | |
1744 | ||
1745 | mutex_enter(&spa->spa_scrub_lock); | |
1746 | spa->spa_scrub_inflight--; | |
1747 | cv_broadcast(&spa->spa_scrub_io_cv); | |
1748 | ||
1749 | if (zio->io_error && (zio->io_error != ECKSUM || | |
1750 | !(zio->io_flags & ZIO_FLAG_SPECULATIVE))) { | |
1751 | spa->spa_dsl_pool->dp_scan->scn_phys.scn_errors++; | |
1752 | } | |
1753 | mutex_exit(&spa->spa_scrub_lock); | |
1754 | } | |
1755 | ||
1756 | static int | |
1757 | dsl_scan_scrub_cb(dsl_pool_t *dp, | |
5dbd68a3 | 1758 | const blkptr_t *bp, const zbookmark_phys_t *zb) |
428870ff BB |
1759 | { |
1760 | dsl_scan_t *scn = dp->dp_scan; | |
1761 | size_t size = BP_GET_PSIZE(bp); | |
1762 | spa_t *spa = dp->dp_spa; | |
1763 | uint64_t phys_birth = BP_PHYSICAL_BIRTH(bp); | |
d6320ddb | 1764 | boolean_t needs_io = B_FALSE; |
572e2857 | 1765 | int zio_flags = ZIO_FLAG_SCAN_THREAD | ZIO_FLAG_RAW | ZIO_FLAG_CANFAIL; |
572e2857 | 1766 | int scan_delay = 0; |
d6320ddb | 1767 | int d; |
428870ff BB |
1768 | |
1769 | if (phys_birth <= scn->scn_phys.scn_min_txg || | |
1770 | phys_birth >= scn->scn_phys.scn_max_txg) | |
1771 | return (0); | |
1772 | ||
1773 | count_block(dp->dp_blkstats, bp); | |
1774 | ||
9b67f605 MA |
1775 | if (BP_IS_EMBEDDED(bp)) |
1776 | return (0); | |
1777 | ||
428870ff BB |
1778 | ASSERT(DSL_SCAN_IS_SCRUB_RESILVER(scn)); |
1779 | if (scn->scn_phys.scn_func == POOL_SCAN_SCRUB) { | |
1780 | zio_flags |= ZIO_FLAG_SCRUB; | |
428870ff | 1781 | needs_io = B_TRUE; |
572e2857 | 1782 | scan_delay = zfs_scrub_delay; |
a117a6d6 GW |
1783 | } else { |
1784 | ASSERT3U(scn->scn_phys.scn_func, ==, POOL_SCAN_RESILVER); | |
428870ff | 1785 | zio_flags |= ZIO_FLAG_RESILVER; |
428870ff | 1786 | needs_io = B_FALSE; |
572e2857 | 1787 | scan_delay = zfs_resilver_delay; |
428870ff BB |
1788 | } |
1789 | ||
1790 | /* If it's an intent log block, failure is expected. */ | |
1791 | if (zb->zb_level == ZB_ZIL_LEVEL) | |
1792 | zio_flags |= ZIO_FLAG_SPECULATIVE; | |
1793 | ||
d6320ddb | 1794 | for (d = 0; d < BP_GET_NDVAS(bp); d++) { |
428870ff BB |
1795 | vdev_t *vd = vdev_lookup_top(spa, |
1796 | DVA_GET_VDEV(&bp->blk_dva[d])); | |
1797 | ||
1798 | /* | |
1799 | * Keep track of how much data we've examined so that | |
1800 | * zpool(1M) status can make useful progress reports. | |
1801 | */ | |
1802 | scn->scn_phys.scn_examined += DVA_GET_ASIZE(&bp->blk_dva[d]); | |
1803 | spa->spa_scan_pass_exam += DVA_GET_ASIZE(&bp->blk_dva[d]); | |
1804 | ||
1805 | /* if it's a resilver, this may not be in the target range */ | |
1806 | if (!needs_io) { | |
1807 | if (DVA_GET_GANG(&bp->blk_dva[d])) { | |
1808 | /* | |
1809 | * Gang members may be spread across multiple | |
1810 | * vdevs, so the best estimate we have is the | |
1811 | * scrub range, which has already been checked. | |
1812 | * XXX -- it would be better to change our | |
1813 | * allocation policy to ensure that all | |
1814 | * gang members reside on the same vdev. | |
1815 | */ | |
1816 | needs_io = B_TRUE; | |
1817 | } else { | |
1818 | needs_io = vdev_dtl_contains(vd, DTL_PARTIAL, | |
1819 | phys_birth, 1); | |
1820 | } | |
1821 | } | |
1822 | } | |
1823 | ||
1824 | if (needs_io && !zfs_no_scrub_io) { | |
572e2857 BB |
1825 | vdev_t *rvd = spa->spa_root_vdev; |
1826 | uint64_t maxinflight = rvd->vdev_children * zfs_top_maxinflight; | |
428870ff BB |
1827 | void *data = zio_data_buf_alloc(size); |
1828 | ||
1829 | mutex_enter(&spa->spa_scrub_lock); | |
572e2857 | 1830 | while (spa->spa_scrub_inflight >= maxinflight) |
428870ff BB |
1831 | cv_wait(&spa->spa_scrub_io_cv, &spa->spa_scrub_lock); |
1832 | spa->spa_scrub_inflight++; | |
1833 | mutex_exit(&spa->spa_scrub_lock); | |
1834 | ||
572e2857 BB |
1835 | /* |
1836 | * If we're seeing recent (zfs_scan_idle) "important" I/Os | |
1837 | * then throttle our workload to limit the impact of a scan. | |
1838 | */ | |
1839 | if (ddi_get_lbolt64() - spa->spa_last_io <= zfs_scan_idle) | |
1840 | delay(scan_delay); | |
1841 | ||
428870ff | 1842 | zio_nowait(zio_read(NULL, spa, bp, data, size, |
e8b96c60 | 1843 | dsl_scan_scrub_done, NULL, ZIO_PRIORITY_SCRUB, |
428870ff BB |
1844 | zio_flags, zb)); |
1845 | } | |
1846 | ||
1847 | /* do not relocate this block */ | |
1848 | return (0); | |
1849 | } | |
1850 | ||
1851 | int | |
1852 | dsl_scan(dsl_pool_t *dp, pool_scan_func_t func) | |
1853 | { | |
1854 | spa_t *spa = dp->dp_spa; | |
1855 | ||
1856 | /* | |
1857 | * Purge all vdev caches and probe all devices. We do this here | |
1858 | * rather than in sync context because this requires a writer lock | |
1859 | * on the spa_config lock, which we can't do from sync context. The | |
1860 | * spa_scrub_reopen flag indicates that vdev_open() should not | |
1861 | * attempt to start another scrub. | |
1862 | */ | |
1863 | spa_vdev_state_enter(spa, SCL_NONE); | |
1864 | spa->spa_scrub_reopen = B_TRUE; | |
1865 | vdev_reopen(spa->spa_root_vdev); | |
1866 | spa->spa_scrub_reopen = B_FALSE; | |
1867 | (void) spa_vdev_state_exit(spa, NULL, 0); | |
1868 | ||
13fe0198 | 1869 | return (dsl_sync_task(spa_name(spa), dsl_scan_setup_check, |
3d45fdd6 | 1870 | dsl_scan_setup_sync, &func, 0, ZFS_SPACE_CHECK_NONE)); |
428870ff | 1871 | } |
c409e464 BB |
1872 | |
1873 | #if defined(_KERNEL) && defined(HAVE_SPL) | |
1874 | module_param(zfs_top_maxinflight, int, 0644); | |
1875 | MODULE_PARM_DESC(zfs_top_maxinflight, "Max I/Os per top-level"); | |
1876 | ||
1877 | module_param(zfs_resilver_delay, int, 0644); | |
1878 | MODULE_PARM_DESC(zfs_resilver_delay, "Number of ticks to delay resilver"); | |
1879 | ||
1880 | module_param(zfs_scrub_delay, int, 0644); | |
1881 | MODULE_PARM_DESC(zfs_scrub_delay, "Number of ticks to delay scrub"); | |
1882 | ||
1883 | module_param(zfs_scan_idle, int, 0644); | |
1884 | MODULE_PARM_DESC(zfs_scan_idle, "Idle window in clock ticks"); | |
1885 | ||
1886 | module_param(zfs_scan_min_time_ms, int, 0644); | |
1887 | MODULE_PARM_DESC(zfs_scan_min_time_ms, "Min millisecs to scrub per txg"); | |
1888 | ||
1889 | module_param(zfs_free_min_time_ms, int, 0644); | |
1890 | MODULE_PARM_DESC(zfs_free_min_time_ms, "Min millisecs to free per txg"); | |
1891 | ||
1892 | module_param(zfs_resilver_min_time_ms, int, 0644); | |
1893 | MODULE_PARM_DESC(zfs_resilver_min_time_ms, "Min millisecs to resilver per txg"); | |
1894 | ||
1895 | module_param(zfs_no_scrub_io, int, 0644); | |
1896 | MODULE_PARM_DESC(zfs_no_scrub_io, "Set to disable scrub I/O"); | |
1897 | ||
1898 | module_param(zfs_no_scrub_prefetch, int, 0644); | |
1899 | MODULE_PARM_DESC(zfs_no_scrub_prefetch, "Set to disable scrub prefetching"); | |
36283ca2 MG |
1900 | |
1901 | module_param(zfs_free_max_blocks, ulong, 0644); | |
1902 | MODULE_PARM_DESC(zfs_free_max_blocks, "Max number of blocks freed in one txg"); | |
c409e464 | 1903 | #endif |