1 // SPDX-License-Identifier: CDDL-1.0
2 /*
3 * CDDL HEADER START
4 *
5 * The contents of this file are subject to the terms of the
6 * Common Development and Distribution License (the "License").
7 * You may not use this file except in compliance with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or https://opensource.org/licenses/CDDL-1.0.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22
23 /*
24 * Copyright (c) 2016, 2024 by Delphix. All rights reserved.
25 */
26
27 #include <sys/spa.h>
28 #include <sys/spa_impl.h>
29 #include <sys/txg.h>
30 #include <sys/vdev_impl.h>
31 #include <sys/metaslab_impl.h>
32 #include <sys/dsl_synctask.h>
33 #include <sys/zap.h>
34 #include <sys/dmu_tx.h>
35 #include <sys/vdev_initialize.h>
36
37 /*
38 * Value that is written to disk during initialization.
39 */
40 static uint64_t zfs_initialize_value = 0xdeadbeefdeadbeeeULL;
41
42 /* maximum number of I/Os outstanding per leaf vdev */
43 static const int zfs_initialize_limit = 1;
44
45 /* size of initializing writes; default 1MiB, see zfs_remove_max_segment */
46 static uint64_t zfs_initialize_chunk_size = 1024 * 1024;
47
48 static boolean_t
vdev_initialize_should_stop(vdev_t * vd)49 vdev_initialize_should_stop(vdev_t *vd)
50 {
51 return (vd->vdev_initialize_exit_wanted || !vdev_writeable(vd) ||
52 vd->vdev_detached || vd->vdev_top->vdev_removing ||
53 vd->vdev_top->vdev_rz_expanding);
54 }
55
56 static void
vdev_initialize_zap_update_sync(void * arg,dmu_tx_t * tx)57 vdev_initialize_zap_update_sync(void *arg, dmu_tx_t *tx)
58 {
59 /*
60 * We pass in the guid instead of the vdev_t since the vdev may
61 * have been freed prior to the sync task being processed. This
62 * happens when a vdev is detached as we call spa_config_vdev_exit(),
63 * stop the initializing thread, schedule the sync task, and free
64 * the vdev. Later when the scheduled sync task is invoked, it would
65 * find that the vdev has been freed.
66 */
67 uint64_t guid = *(uint64_t *)arg;
68 uint64_t txg = dmu_tx_get_txg(tx);
69 kmem_free(arg, sizeof (uint64_t));
70
71 vdev_t *vd = spa_lookup_by_guid(tx->tx_pool->dp_spa, guid, B_FALSE);
72 if (vd == NULL || vd->vdev_top->vdev_removing ||
73 !vdev_is_concrete(vd) || vd->vdev_top->vdev_rz_expanding)
74 return;
75
76 uint64_t last_offset = vd->vdev_initialize_offset[txg & TXG_MASK];
77 vd->vdev_initialize_offset[txg & TXG_MASK] = 0;
78
79 VERIFY(vd->vdev_leaf_zap != 0);
80
81 objset_t *mos = vd->vdev_spa->spa_meta_objset;
82
83 if (last_offset > 0) {
84 vd->vdev_initialize_last_offset = last_offset;
85 VERIFY0(zap_update(mos, vd->vdev_leaf_zap,
86 VDEV_LEAF_ZAP_INITIALIZE_LAST_OFFSET,
87 sizeof (last_offset), 1, &last_offset, tx));
88 }
89 if (vd->vdev_initialize_action_time > 0) {
90 uint64_t val = (uint64_t)vd->vdev_initialize_action_time;
91 VERIFY0(zap_update(mos, vd->vdev_leaf_zap,
92 VDEV_LEAF_ZAP_INITIALIZE_ACTION_TIME, sizeof (val),
93 1, &val, tx));
94 }
95
96 uint64_t initialize_state = vd->vdev_initialize_state;
97 VERIFY0(zap_update(mos, vd->vdev_leaf_zap,
98 VDEV_LEAF_ZAP_INITIALIZE_STATE, sizeof (initialize_state), 1,
99 &initialize_state, tx));
100 }
101
102 static void
vdev_initialize_zap_remove_sync(void * arg,dmu_tx_t * tx)103 vdev_initialize_zap_remove_sync(void *arg, dmu_tx_t *tx)
104 {
105 uint64_t guid = *(uint64_t *)arg;
106
107 kmem_free(arg, sizeof (uint64_t));
108
109 vdev_t *vd = spa_lookup_by_guid(tx->tx_pool->dp_spa, guid, B_FALSE);
110 if (vd == NULL || vd->vdev_top->vdev_removing || !vdev_is_concrete(vd))
111 return;
112
113 ASSERT3S(vd->vdev_initialize_state, ==, VDEV_INITIALIZE_NONE);
114 ASSERT3U(vd->vdev_leaf_zap, !=, 0);
115
116 vd->vdev_initialize_last_offset = 0;
117 vd->vdev_initialize_action_time = 0;
118
119 objset_t *mos = vd->vdev_spa->spa_meta_objset;
120 int error;
121
122 error = zap_remove(mos, vd->vdev_leaf_zap,
123 VDEV_LEAF_ZAP_INITIALIZE_LAST_OFFSET, tx);
124 VERIFY(error == 0 || error == ENOENT);
125
126 error = zap_remove(mos, vd->vdev_leaf_zap,
127 VDEV_LEAF_ZAP_INITIALIZE_STATE, tx);
128 VERIFY(error == 0 || error == ENOENT);
129
130 error = zap_remove(mos, vd->vdev_leaf_zap,
131 VDEV_LEAF_ZAP_INITIALIZE_ACTION_TIME, tx);
132 VERIFY(error == 0 || error == ENOENT);
133 }
134
135 static void
vdev_initialize_change_state(vdev_t * vd,vdev_initializing_state_t new_state)136 vdev_initialize_change_state(vdev_t *vd, vdev_initializing_state_t new_state)
137 {
138 ASSERT(MUTEX_HELD(&vd->vdev_initialize_lock));
139 spa_t *spa = vd->vdev_spa;
140
141 if (new_state == vd->vdev_initialize_state)
142 return;
143
144 /*
145 * Copy the vd's guid, this will be freed by the sync task.
146 */
147 uint64_t *guid = kmem_zalloc(sizeof (uint64_t), KM_SLEEP);
148 *guid = vd->vdev_guid;
149
150 /*
151 * If we're suspending, then preserving the original start time.
152 */
153 if (vd->vdev_initialize_state != VDEV_INITIALIZE_SUSPENDED) {
154 vd->vdev_initialize_action_time = gethrestime_sec();
155 }
156
157 vdev_initializing_state_t old_state = vd->vdev_initialize_state;
158 vd->vdev_initialize_state = new_state;
159
160 dmu_tx_t *tx = dmu_tx_create_dd(spa_get_dsl(spa)->dp_mos_dir);
161 VERIFY0(dmu_tx_assign(tx, DMU_TX_WAIT));
162
163 if (new_state != VDEV_INITIALIZE_NONE) {
164 dsl_sync_task_nowait(spa_get_dsl(spa),
165 vdev_initialize_zap_update_sync, guid, tx);
166 } else {
167 dsl_sync_task_nowait(spa_get_dsl(spa),
168 vdev_initialize_zap_remove_sync, guid, tx);
169 }
170
171 switch (new_state) {
172 case VDEV_INITIALIZE_ACTIVE:
173 spa_history_log_internal(spa, "initialize", tx,
174 "vdev=%s activated", vd->vdev_path);
175 break;
176 case VDEV_INITIALIZE_SUSPENDED:
177 spa_history_log_internal(spa, "initialize", tx,
178 "vdev=%s suspended", vd->vdev_path);
179 break;
180 case VDEV_INITIALIZE_CANCELED:
181 if (old_state == VDEV_INITIALIZE_ACTIVE ||
182 old_state == VDEV_INITIALIZE_SUSPENDED)
183 spa_history_log_internal(spa, "initialize", tx,
184 "vdev=%s canceled", vd->vdev_path);
185 break;
186 case VDEV_INITIALIZE_COMPLETE:
187 spa_history_log_internal(spa, "initialize", tx,
188 "vdev=%s complete", vd->vdev_path);
189 break;
190 case VDEV_INITIALIZE_NONE:
191 spa_history_log_internal(spa, "uninitialize", tx,
192 "vdev=%s", vd->vdev_path);
193 break;
194 default:
195 panic("invalid state %llu", (unsigned long long)new_state);
196 }
197
198 dmu_tx_commit(tx);
199
200 if (new_state != VDEV_INITIALIZE_ACTIVE)
201 spa_notify_waiters(spa);
202 }
203
204 static void
vdev_initialize_cb(zio_t * zio)205 vdev_initialize_cb(zio_t *zio)
206 {
207 vdev_t *vd = zio->io_vd;
208 mutex_enter(&vd->vdev_initialize_io_lock);
209 if (zio->io_error == ENXIO && !vdev_writeable(vd)) {
210 /*
211 * The I/O failed because the vdev was unavailable; roll the
212 * last offset back. (This works because spa_sync waits on
213 * spa_txg_zio before it runs sync tasks.)
214 */
215 uint64_t *off =
216 &vd->vdev_initialize_offset[zio->io_txg & TXG_MASK];
217 *off = MIN(*off, zio->io_offset);
218 } else {
219 /*
220 * Since initializing is best-effort, we ignore I/O errors and
221 * rely on vdev_probe to determine if the errors are more
222 * critical.
223 */
224 if (zio->io_error != 0)
225 vd->vdev_stat.vs_initialize_errors++;
226
227 vd->vdev_initialize_bytes_done += zio->io_orig_size;
228 }
229 ASSERT3U(vd->vdev_initialize_inflight, >, 0);
230 vd->vdev_initialize_inflight--;
231 cv_broadcast(&vd->vdev_initialize_io_cv);
232 mutex_exit(&vd->vdev_initialize_io_lock);
233
234 spa_config_exit(vd->vdev_spa, SCL_STATE_ALL, vd);
235 }
236
237 /* Takes care of physical writing and limiting # of concurrent ZIOs. */
238 static int
vdev_initialize_write(vdev_t * vd,uint64_t start,uint64_t size,abd_t * data)239 vdev_initialize_write(vdev_t *vd, uint64_t start, uint64_t size, abd_t *data)
240 {
241 spa_t *spa = vd->vdev_spa;
242
243 /* Limit inflight initializing I/Os */
244 mutex_enter(&vd->vdev_initialize_io_lock);
245 while (vd->vdev_initialize_inflight >= zfs_initialize_limit) {
246 cv_wait(&vd->vdev_initialize_io_cv,
247 &vd->vdev_initialize_io_lock);
248 }
249 vd->vdev_initialize_inflight++;
250 mutex_exit(&vd->vdev_initialize_io_lock);
251
252 dmu_tx_t *tx = dmu_tx_create_dd(spa_get_dsl(spa)->dp_mos_dir);
253 VERIFY0(dmu_tx_assign(tx, DMU_TX_WAIT));
254 uint64_t txg = dmu_tx_get_txg(tx);
255
256 spa_config_enter(spa, SCL_STATE_ALL, vd, RW_READER);
257 mutex_enter(&vd->vdev_initialize_lock);
258
259 if (vd->vdev_initialize_offset[txg & TXG_MASK] == 0) {
260 uint64_t *guid = kmem_zalloc(sizeof (uint64_t), KM_SLEEP);
261 *guid = vd->vdev_guid;
262
263 /* This is the first write of this txg. */
264 dsl_sync_task_nowait(spa_get_dsl(spa),
265 vdev_initialize_zap_update_sync, guid, tx);
266 }
267
268 /*
269 * We know the vdev struct will still be around since all
270 * consumers of vdev_free must stop the initialization first.
271 */
272 if (vdev_initialize_should_stop(vd)) {
273 mutex_enter(&vd->vdev_initialize_io_lock);
274 ASSERT3U(vd->vdev_initialize_inflight, >, 0);
275 vd->vdev_initialize_inflight--;
276 mutex_exit(&vd->vdev_initialize_io_lock);
277 spa_config_exit(vd->vdev_spa, SCL_STATE_ALL, vd);
278 mutex_exit(&vd->vdev_initialize_lock);
279 dmu_tx_commit(tx);
280 return (SET_ERROR(EINTR));
281 }
282 mutex_exit(&vd->vdev_initialize_lock);
283
284 vd->vdev_initialize_offset[txg & TXG_MASK] = start + size;
285 zio_nowait(zio_write_phys(spa->spa_txg_zio[txg & TXG_MASK], vd, start,
286 size, data, ZIO_CHECKSUM_OFF, vdev_initialize_cb, NULL,
287 ZIO_PRIORITY_INITIALIZING, ZIO_FLAG_CANFAIL, B_FALSE));
288 /* vdev_initialize_cb releases SCL_STATE_ALL */
289
290 dmu_tx_commit(tx);
291
292 return (0);
293 }
294
295 /*
296 * Callback to fill each ABD chunk with zfs_initialize_value. len must be
297 * divisible by sizeof (uint64_t), and buf must be 8-byte aligned. The ABD
298 * allocation will guarantee these for us.
299 */
300 static int
vdev_initialize_block_fill(void * buf,size_t len,void * unused)301 vdev_initialize_block_fill(void *buf, size_t len, void *unused)
302 {
303 (void) unused;
304
305 ASSERT0(len % sizeof (uint64_t));
306 for (uint64_t i = 0; i < len; i += sizeof (uint64_t)) {
307 *(uint64_t *)((char *)(buf) + i) = zfs_initialize_value;
308 }
309 return (0);
310 }
311
312 static abd_t *
vdev_initialize_block_alloc(void)313 vdev_initialize_block_alloc(void)
314 {
315 /* Allocate ABD for filler data */
316 abd_t *data = abd_alloc_for_io(zfs_initialize_chunk_size, B_FALSE);
317
318 ASSERT0(zfs_initialize_chunk_size % sizeof (uint64_t));
319 (void) abd_iterate_func(data, 0, zfs_initialize_chunk_size,
320 vdev_initialize_block_fill, NULL);
321
322 return (data);
323 }
324
325 static void
vdev_initialize_block_free(abd_t * data)326 vdev_initialize_block_free(abd_t *data)
327 {
328 abd_free(data);
329 }
330
331 static int
vdev_initialize_ranges(vdev_t * vd,abd_t * data)332 vdev_initialize_ranges(vdev_t *vd, abd_t *data)
333 {
334 zfs_range_tree_t *rt = vd->vdev_initialize_tree;
335 zfs_btree_t *bt = &rt->rt_root;
336 zfs_btree_index_t where;
337
338 for (zfs_range_seg_t *rs = zfs_btree_first(bt, &where); rs != NULL;
339 rs = zfs_btree_next(bt, &where, &where)) {
340 uint64_t size = zfs_rs_get_end(rs, rt) -
341 zfs_rs_get_start(rs, rt);
342
343 /* Split range into legally-sized physical chunks */
344 uint64_t writes_required =
345 ((size - 1) / zfs_initialize_chunk_size) + 1;
346
347 for (uint64_t w = 0; w < writes_required; w++) {
348 int error;
349
350 error = vdev_initialize_write(vd,
351 VDEV_LABEL_START_SIZE + zfs_rs_get_start(rs, rt) +
352 (w * zfs_initialize_chunk_size),
353 MIN(size - (w * zfs_initialize_chunk_size),
354 zfs_initialize_chunk_size), data);
355 if (error != 0)
356 return (error);
357 }
358 }
359 return (0);
360 }
361
362 static void
vdev_initialize_xlate_last_rs_end(void * arg,zfs_range_seg64_t * physical_rs)363 vdev_initialize_xlate_last_rs_end(void *arg, zfs_range_seg64_t *physical_rs)
364 {
365 uint64_t *last_rs_end = (uint64_t *)arg;
366
367 if (physical_rs->rs_end > *last_rs_end)
368 *last_rs_end = physical_rs->rs_end;
369 }
370
371 static void
vdev_initialize_xlate_progress(void * arg,zfs_range_seg64_t * physical_rs)372 vdev_initialize_xlate_progress(void *arg, zfs_range_seg64_t *physical_rs)
373 {
374 vdev_t *vd = (vdev_t *)arg;
375
376 uint64_t size = physical_rs->rs_end - physical_rs->rs_start;
377 vd->vdev_initialize_bytes_est += size;
378
379 if (vd->vdev_initialize_last_offset > physical_rs->rs_end) {
380 vd->vdev_initialize_bytes_done += size;
381 } else if (vd->vdev_initialize_last_offset > physical_rs->rs_start &&
382 vd->vdev_initialize_last_offset < physical_rs->rs_end) {
383 vd->vdev_initialize_bytes_done +=
384 vd->vdev_initialize_last_offset - physical_rs->rs_start;
385 }
386 }
387
388 static void
vdev_initialize_calculate_progress(vdev_t * vd)389 vdev_initialize_calculate_progress(vdev_t *vd)
390 {
391 ASSERT(spa_config_held(vd->vdev_spa, SCL_CONFIG, RW_READER) ||
392 spa_config_held(vd->vdev_spa, SCL_CONFIG, RW_WRITER));
393 ASSERT(vd->vdev_leaf_zap != 0);
394
395 vd->vdev_initialize_bytes_est = 0;
396 vd->vdev_initialize_bytes_done = 0;
397
398 for (uint64_t i = 0; i < vd->vdev_top->vdev_ms_count; i++) {
399 metaslab_t *msp = vd->vdev_top->vdev_ms[i];
400 mutex_enter(&msp->ms_lock);
401
402 uint64_t ms_free = (msp->ms_size -
403 metaslab_allocated_space(msp)) /
404 vdev_get_ndisks(vd->vdev_top);
405
406 /*
407 * Convert the metaslab range to a physical range
408 * on our vdev. We use this to determine if we are
409 * in the middle of this metaslab range.
410 */
411 zfs_range_seg64_t logical_rs, physical_rs, remain_rs;
412 logical_rs.rs_start = msp->ms_start;
413 logical_rs.rs_end = msp->ms_start + msp->ms_size;
414
415 /* Metaslab space after this offset has not been initialized */
416 vdev_xlate(vd, &logical_rs, &physical_rs, &remain_rs);
417 if (vd->vdev_initialize_last_offset <= physical_rs.rs_start) {
418 vd->vdev_initialize_bytes_est += ms_free;
419 mutex_exit(&msp->ms_lock);
420 continue;
421 }
422
423 /* Metaslab space before this offset has been initialized */
424 uint64_t last_rs_end = physical_rs.rs_end;
425 if (!vdev_xlate_is_empty(&remain_rs)) {
426 vdev_xlate_walk(vd, &remain_rs,
427 vdev_initialize_xlate_last_rs_end, &last_rs_end);
428 }
429
430 if (vd->vdev_initialize_last_offset > last_rs_end) {
431 vd->vdev_initialize_bytes_done += ms_free;
432 vd->vdev_initialize_bytes_est += ms_free;
433 mutex_exit(&msp->ms_lock);
434 continue;
435 }
436
437 /*
438 * If we get here, we're in the middle of initializing this
439 * metaslab. Load it and walk the free tree for more accurate
440 * progress estimation.
441 */
442 VERIFY0(metaslab_load(msp));
443
444 zfs_btree_index_t where;
445 zfs_range_tree_t *rt = msp->ms_allocatable;
446 for (zfs_range_seg_t *rs =
447 zfs_btree_first(&rt->rt_root, &where); rs;
448 rs = zfs_btree_next(&rt->rt_root, &where,
449 &where)) {
450 logical_rs.rs_start = zfs_rs_get_start(rs, rt);
451 logical_rs.rs_end = zfs_rs_get_end(rs, rt);
452
453 vdev_xlate_walk(vd, &logical_rs,
454 vdev_initialize_xlate_progress, vd);
455 }
456 mutex_exit(&msp->ms_lock);
457 }
458 }
459
460 static int
vdev_initialize_load(vdev_t * vd)461 vdev_initialize_load(vdev_t *vd)
462 {
463 int err = 0;
464 ASSERT(spa_config_held(vd->vdev_spa, SCL_CONFIG, RW_READER) ||
465 spa_config_held(vd->vdev_spa, SCL_CONFIG, RW_WRITER));
466 ASSERT(vd->vdev_leaf_zap != 0);
467
468 if (vd->vdev_initialize_state == VDEV_INITIALIZE_ACTIVE ||
469 vd->vdev_initialize_state == VDEV_INITIALIZE_SUSPENDED) {
470 err = zap_lookup(vd->vdev_spa->spa_meta_objset,
471 vd->vdev_leaf_zap, VDEV_LEAF_ZAP_INITIALIZE_LAST_OFFSET,
472 sizeof (vd->vdev_initialize_last_offset), 1,
473 &vd->vdev_initialize_last_offset);
474 if (err == ENOENT) {
475 vd->vdev_initialize_last_offset = 0;
476 err = 0;
477 }
478 }
479
480 vdev_initialize_calculate_progress(vd);
481 return (err);
482 }
483
484 static void
vdev_initialize_xlate_range_add(void * arg,zfs_range_seg64_t * physical_rs)485 vdev_initialize_xlate_range_add(void *arg, zfs_range_seg64_t *physical_rs)
486 {
487 vdev_t *vd = arg;
488
489 /* Only add segments that we have not visited yet */
490 if (physical_rs->rs_end <= vd->vdev_initialize_last_offset)
491 return;
492
493 /* Pick up where we left off mid-range. */
494 if (vd->vdev_initialize_last_offset > physical_rs->rs_start) {
495 zfs_dbgmsg("range write: vd %s changed (%llu, %llu) to "
496 "(%llu, %llu)", vd->vdev_path,
497 (u_longlong_t)physical_rs->rs_start,
498 (u_longlong_t)physical_rs->rs_end,
499 (u_longlong_t)vd->vdev_initialize_last_offset,
500 (u_longlong_t)physical_rs->rs_end);
501 ASSERT3U(physical_rs->rs_end, >,
502 vd->vdev_initialize_last_offset);
503 physical_rs->rs_start = vd->vdev_initialize_last_offset;
504 }
505
506 ASSERT3U(physical_rs->rs_end, >, physical_rs->rs_start);
507
508 zfs_range_tree_add(vd->vdev_initialize_tree, physical_rs->rs_start,
509 physical_rs->rs_end - physical_rs->rs_start);
510 }
511
512 /*
513 * Convert the logical range into a physical range and add it to our
514 * avl tree.
515 */
516 static void
vdev_initialize_range_add(void * arg,uint64_t start,uint64_t size)517 vdev_initialize_range_add(void *arg, uint64_t start, uint64_t size)
518 {
519 vdev_t *vd = arg;
520 zfs_range_seg64_t logical_rs;
521 logical_rs.rs_start = start;
522 logical_rs.rs_end = start + size;
523
524 ASSERT(vd->vdev_ops->vdev_op_leaf);
525 vdev_xlate_walk(vd, &logical_rs, vdev_initialize_xlate_range_add, arg);
526 }
527
528 static __attribute__((noreturn)) void
vdev_initialize_thread(void * arg)529 vdev_initialize_thread(void *arg)
530 {
531 vdev_t *vd = arg;
532 spa_t *spa = vd->vdev_spa;
533 int error = 0;
534 uint64_t ms_count = 0;
535
536 ASSERT(vdev_is_concrete(vd));
537 spa_config_enter(spa, SCL_CONFIG, FTAG, RW_READER);
538
539 vd->vdev_initialize_last_offset = 0;
540 VERIFY0(vdev_initialize_load(vd));
541
542 abd_t *deadbeef = vdev_initialize_block_alloc();
543
544 vd->vdev_initialize_tree = zfs_range_tree_create(NULL, ZFS_RANGE_SEG64,
545 NULL, 0, 0);
546
547 for (uint64_t i = 0; !vd->vdev_detached &&
548 i < vd->vdev_top->vdev_ms_count; i++) {
549 metaslab_t *msp = vd->vdev_top->vdev_ms[i];
550 boolean_t unload_when_done = B_FALSE;
551
552 /*
553 * If we've expanded the top-level vdev or it's our
554 * first pass, calculate our progress.
555 */
556 if (vd->vdev_top->vdev_ms_count != ms_count) {
557 vdev_initialize_calculate_progress(vd);
558 ms_count = vd->vdev_top->vdev_ms_count;
559 }
560
561 spa_config_exit(spa, SCL_CONFIG, FTAG);
562 metaslab_disable(msp);
563 mutex_enter(&msp->ms_lock);
564 if (!msp->ms_loaded && !msp->ms_loading)
565 unload_when_done = B_TRUE;
566 VERIFY0(metaslab_load(msp));
567
568 zfs_range_tree_walk(msp->ms_allocatable,
569 vdev_initialize_range_add, vd);
570 mutex_exit(&msp->ms_lock);
571
572 error = vdev_initialize_ranges(vd, deadbeef);
573 metaslab_enable(msp, B_TRUE, unload_when_done);
574 spa_config_enter(spa, SCL_CONFIG, FTAG, RW_READER);
575
576 zfs_range_tree_vacate(vd->vdev_initialize_tree, NULL, NULL);
577 if (error != 0)
578 break;
579 }
580
581 spa_config_exit(spa, SCL_CONFIG, FTAG);
582 mutex_enter(&vd->vdev_initialize_io_lock);
583 while (vd->vdev_initialize_inflight > 0) {
584 cv_wait(&vd->vdev_initialize_io_cv,
585 &vd->vdev_initialize_io_lock);
586 }
587 mutex_exit(&vd->vdev_initialize_io_lock);
588
589 zfs_range_tree_destroy(vd->vdev_initialize_tree);
590 vdev_initialize_block_free(deadbeef);
591 vd->vdev_initialize_tree = NULL;
592
593 mutex_enter(&vd->vdev_initialize_lock);
594 if (!vd->vdev_initialize_exit_wanted) {
595 if (vdev_writeable(vd)) {
596 vdev_initialize_change_state(vd,
597 VDEV_INITIALIZE_COMPLETE);
598 } else if (vd->vdev_faulted) {
599 vdev_initialize_change_state(vd,
600 VDEV_INITIALIZE_CANCELED);
601 }
602 }
603 ASSERT(vd->vdev_initialize_thread != NULL ||
604 vd->vdev_initialize_inflight == 0);
605
606 /*
607 * Drop the vdev_initialize_lock while we sync out the
608 * txg since it's possible that a device might be trying to
609 * come online and must check to see if it needs to restart an
610 * initialization. That thread will be holding the spa_config_lock
611 * which would prevent the txg_wait_synced from completing.
612 */
613 mutex_exit(&vd->vdev_initialize_lock);
614 txg_wait_synced(spa_get_dsl(spa), 0);
615 mutex_enter(&vd->vdev_initialize_lock);
616
617 vd->vdev_initialize_thread = NULL;
618 cv_broadcast(&vd->vdev_initialize_cv);
619 mutex_exit(&vd->vdev_initialize_lock);
620
621 thread_exit();
622 }
623
624 /*
625 * Initiates a device. Caller must hold vdev_initialize_lock.
626 * Device must be a leaf and not already be initializing.
627 */
628 void
vdev_initialize(vdev_t * vd)629 vdev_initialize(vdev_t *vd)
630 {
631 ASSERT(MUTEX_HELD(&vd->vdev_initialize_lock));
632 ASSERT(vd->vdev_ops->vdev_op_leaf);
633 ASSERT(vdev_is_concrete(vd));
634 ASSERT3P(vd->vdev_initialize_thread, ==, NULL);
635 ASSERT(!vd->vdev_detached);
636 ASSERT(!vd->vdev_initialize_exit_wanted);
637 ASSERT(!vd->vdev_top->vdev_removing);
638 ASSERT(!vd->vdev_top->vdev_rz_expanding);
639
640 vdev_initialize_change_state(vd, VDEV_INITIALIZE_ACTIVE);
641 vd->vdev_initialize_thread = thread_create(NULL, 0,
642 vdev_initialize_thread, vd, 0, &p0, TS_RUN, maxclsyspri);
643 }
644
645 /*
646 * Uninitializes a device. Caller must hold vdev_initialize_lock.
647 * Device must be a leaf and not already be initializing.
648 */
649 void
vdev_uninitialize(vdev_t * vd)650 vdev_uninitialize(vdev_t *vd)
651 {
652 ASSERT(MUTEX_HELD(&vd->vdev_initialize_lock));
653 ASSERT(vd->vdev_ops->vdev_op_leaf);
654 ASSERT(vdev_is_concrete(vd));
655 ASSERT3P(vd->vdev_initialize_thread, ==, NULL);
656 ASSERT(!vd->vdev_detached);
657 ASSERT(!vd->vdev_initialize_exit_wanted);
658 ASSERT(!vd->vdev_top->vdev_removing);
659
660 vdev_initialize_change_state(vd, VDEV_INITIALIZE_NONE);
661 }
662
663 /*
664 * Wait for the initialize thread to be terminated (cancelled or stopped).
665 */
666 static void
vdev_initialize_stop_wait_impl(vdev_t * vd)667 vdev_initialize_stop_wait_impl(vdev_t *vd)
668 {
669 ASSERT(MUTEX_HELD(&vd->vdev_initialize_lock));
670
671 while (vd->vdev_initialize_thread != NULL)
672 cv_wait(&vd->vdev_initialize_cv, &vd->vdev_initialize_lock);
673
674 ASSERT3P(vd->vdev_initialize_thread, ==, NULL);
675 vd->vdev_initialize_exit_wanted = B_FALSE;
676 }
677
678 /*
679 * Wait for vdev initialize threads which were either to cleanly exit.
680 */
681 void
vdev_initialize_stop_wait(spa_t * spa,list_t * vd_list)682 vdev_initialize_stop_wait(spa_t *spa, list_t *vd_list)
683 {
684 (void) spa;
685 vdev_t *vd;
686
687 ASSERT(MUTEX_HELD(&spa_namespace_lock) ||
688 spa->spa_export_thread == curthread);
689
690 while ((vd = list_remove_head(vd_list)) != NULL) {
691 mutex_enter(&vd->vdev_initialize_lock);
692 vdev_initialize_stop_wait_impl(vd);
693 mutex_exit(&vd->vdev_initialize_lock);
694 }
695 }
696
697 /*
698 * Stop initializing a device, with the resultant initializing state being
699 * tgt_state. For blocking behavior pass NULL for vd_list. Otherwise, when
700 * a list_t is provided the stopping vdev is inserted in to the list. Callers
701 * are then required to call vdev_initialize_stop_wait() to block for all the
702 * initialization threads to exit. The caller must hold vdev_initialize_lock
703 * and must not be writing to the spa config, as the initializing thread may
704 * try to enter the config as a reader before exiting.
705 */
706 void
vdev_initialize_stop(vdev_t * vd,vdev_initializing_state_t tgt_state,list_t * vd_list)707 vdev_initialize_stop(vdev_t *vd, vdev_initializing_state_t tgt_state,
708 list_t *vd_list)
709 {
710 ASSERT(!spa_config_held(vd->vdev_spa, SCL_CONFIG|SCL_STATE, RW_WRITER));
711 ASSERT(MUTEX_HELD(&vd->vdev_initialize_lock));
712 ASSERT(vd->vdev_ops->vdev_op_leaf);
713 ASSERT(vdev_is_concrete(vd));
714
715 /*
716 * Allow cancel requests to proceed even if the initialize thread
717 * has stopped.
718 */
719 if (vd->vdev_initialize_thread == NULL &&
720 tgt_state != VDEV_INITIALIZE_CANCELED) {
721 return;
722 }
723
724 vdev_initialize_change_state(vd, tgt_state);
725 vd->vdev_initialize_exit_wanted = B_TRUE;
726
727 if (vd_list == NULL) {
728 vdev_initialize_stop_wait_impl(vd);
729 } else {
730 ASSERT(MUTEX_HELD(&spa_namespace_lock) ||
731 vd->vdev_spa->spa_export_thread == curthread);
732 list_insert_tail(vd_list, vd);
733 }
734 }
735
736 static void
vdev_initialize_stop_all_impl(vdev_t * vd,vdev_initializing_state_t tgt_state,list_t * vd_list)737 vdev_initialize_stop_all_impl(vdev_t *vd, vdev_initializing_state_t tgt_state,
738 list_t *vd_list)
739 {
740 if (vd->vdev_ops->vdev_op_leaf && vdev_is_concrete(vd)) {
741 mutex_enter(&vd->vdev_initialize_lock);
742 vdev_initialize_stop(vd, tgt_state, vd_list);
743 mutex_exit(&vd->vdev_initialize_lock);
744 return;
745 }
746
747 for (uint64_t i = 0; i < vd->vdev_children; i++) {
748 vdev_initialize_stop_all_impl(vd->vdev_child[i], tgt_state,
749 vd_list);
750 }
751 }
752
753 /*
754 * Convenience function to stop initializing of a vdev tree and set all
755 * initialize thread pointers to NULL.
756 */
757 void
vdev_initialize_stop_all(vdev_t * vd,vdev_initializing_state_t tgt_state)758 vdev_initialize_stop_all(vdev_t *vd, vdev_initializing_state_t tgt_state)
759 {
760 spa_t *spa = vd->vdev_spa;
761 list_t vd_list;
762
763 ASSERT(MUTEX_HELD(&spa_namespace_lock) ||
764 spa->spa_export_thread == curthread);
765
766 list_create(&vd_list, sizeof (vdev_t),
767 offsetof(vdev_t, vdev_initialize_node));
768
769 vdev_initialize_stop_all_impl(vd, tgt_state, &vd_list);
770 vdev_initialize_stop_wait(spa, &vd_list);
771
772 if (vd->vdev_spa->spa_sync_on) {
773 /* Make sure that our state has been synced to disk */
774 txg_wait_synced(spa_get_dsl(vd->vdev_spa), 0);
775 }
776
777 list_destroy(&vd_list);
778 }
779
780 void
vdev_initialize_restart(vdev_t * vd)781 vdev_initialize_restart(vdev_t *vd)
782 {
783 ASSERT(MUTEX_HELD(&spa_namespace_lock) ||
784 vd->vdev_spa->spa_load_thread == curthread);
785 ASSERT(!spa_config_held(vd->vdev_spa, SCL_ALL, RW_WRITER));
786
787 if (vd->vdev_leaf_zap != 0) {
788 mutex_enter(&vd->vdev_initialize_lock);
789 uint64_t initialize_state = VDEV_INITIALIZE_NONE;
790 int err = zap_lookup(vd->vdev_spa->spa_meta_objset,
791 vd->vdev_leaf_zap, VDEV_LEAF_ZAP_INITIALIZE_STATE,
792 sizeof (initialize_state), 1, &initialize_state);
793 ASSERT(err == 0 || err == ENOENT);
794 vd->vdev_initialize_state = initialize_state;
795
796 uint64_t timestamp = 0;
797 err = zap_lookup(vd->vdev_spa->spa_meta_objset,
798 vd->vdev_leaf_zap, VDEV_LEAF_ZAP_INITIALIZE_ACTION_TIME,
799 sizeof (timestamp), 1, ×tamp);
800 ASSERT(err == 0 || err == ENOENT);
801 vd->vdev_initialize_action_time = timestamp;
802
803 if ((vd->vdev_initialize_state == VDEV_INITIALIZE_SUSPENDED ||
804 vd->vdev_offline) && !vd->vdev_top->vdev_rz_expanding) {
805 /* load progress for reporting, but don't resume */
806 VERIFY0(vdev_initialize_load(vd));
807 } else if (vd->vdev_initialize_state ==
808 VDEV_INITIALIZE_ACTIVE && vdev_writeable(vd) &&
809 !vd->vdev_top->vdev_removing &&
810 !vd->vdev_top->vdev_rz_expanding &&
811 vd->vdev_initialize_thread == NULL) {
812 vdev_initialize(vd);
813 }
814
815 mutex_exit(&vd->vdev_initialize_lock);
816 }
817
818 for (uint64_t i = 0; i < vd->vdev_children; i++) {
819 vdev_initialize_restart(vd->vdev_child[i]);
820 }
821 }
822
823 EXPORT_SYMBOL(vdev_initialize);
824 EXPORT_SYMBOL(vdev_uninitialize);
825 EXPORT_SYMBOL(vdev_initialize_stop);
826 EXPORT_SYMBOL(vdev_initialize_stop_all);
827 EXPORT_SYMBOL(vdev_initialize_stop_wait);
828 EXPORT_SYMBOL(vdev_initialize_restart);
829
830 ZFS_MODULE_PARAM(zfs, zfs_, initialize_value, U64, ZMOD_RW,
831 "Value written during zpool initialize");
832
833 ZFS_MODULE_PARAM(zfs, zfs_, initialize_chunk_size, U64, ZMOD_RW,
834 "Size in bytes of writes by zpool initialize");
835