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15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
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24 * Copyright (c) 2011, 2018 by Delphix. All rights reserved.
27 #include <sys/zfs_context.h>
28 #include <sys/spa_impl.h>
30 #include <sys/dmu_tx.h>
32 #include <sys/vdev_impl.h>
33 #include <sys/metaslab.h>
34 #include <sys/metaslab_impl.h>
35 #include <sys/uberblock_impl.h>
38 #include <sys/bpobj.h>
39 #include <sys/dsl_pool.h>
40 #include <sys/dsl_synctask.h>
41 #include <sys/dsl_dir.h>
43 #include <sys/zfeature.h>
44 #include <sys/vdev_indirect_births.h>
45 #include <sys/vdev_indirect_mapping.h>
47 #include <sys/vdev_initialize.h>
50 * This file contains the necessary logic to remove vdevs from a
51 * storage pool. Currently, the only devices that can be removed
52 * are log, cache, and spare devices; and top level vdevs from a pool
53 * w/o raidz. (Note that members of a mirror can also be removed
54 * by the detach operation.)
56 * Log vdevs are removed by evacuating them and then turning the vdev
57 * into a hole vdev while holding spa config locks.
59 * Top level vdevs are removed and converted into an indirect vdev via
60 * a multi-step process:
62 * - Disable allocations from this device (spa_vdev_remove_top).
64 * - From a new thread (spa_vdev_remove_thread), copy data from
65 * the removing vdev to a different vdev. The copy happens in open
66 * context (spa_vdev_copy_impl) and issues a sync task
67 * (vdev_mapping_sync) so the sync thread can update the partial
68 * indirect mappings in core and on disk.
70 * - If a free happens during a removal, it is freed from the
71 * removing vdev, and if it has already been copied, from the new
72 * location as well (free_from_removing_vdev).
74 * - After the removal is completed, the copy thread converts the vdev
75 * into an indirect vdev (vdev_remove_complete) before instructing
76 * the sync thread to destroy the space maps and finish the removal
77 * (spa_finish_removal).
80 typedef struct vdev_copy_arg {
82 uint64_t vca_outstanding_bytes;
88 * The maximum amount of memory we can use for outstanding i/o while
89 * doing a device removal. This determines how much i/o we can have
90 * in flight concurrently.
92 int zfs_remove_max_copy_bytes = 64 * 1024 * 1024;
95 * The largest contiguous segment that we will attempt to allocate when
96 * removing a device. This can be no larger than SPA_MAXBLOCKSIZE. If
97 * there is a performance problem with attempting to allocate large blocks,
98 * consider decreasing this.
100 * Note: we will issue I/Os of up to this size. The mpt driver does not
101 * respond well to I/Os larger than 1MB, so we set this to 1MB. (When
102 * mpt processes an I/O larger than 1MB, it needs to do an allocation of
103 * 2 physically contiguous pages; if this allocation fails, mpt will drop
104 * the I/O and hang the device.)
106 int zfs_remove_max_segment = 1024 * 1024;
109 * Allow a remap segment to span free chunks of at most this size. The main
110 * impact of a larger span is that we will read and write larger, more
111 * contiguous chunks, with more "unnecessary" data -- trading off bandwidth
112 * for iops. The value here was chosen to align with
113 * zfs_vdev_read_gap_limit, which is a similar concept when doing regular
114 * reads (but there's no reason it has to be the same).
116 * Additionally, a higher span will have the following relatively minor
118 * - the mapping will be smaller, since one entry can cover more allocated
120 * - more of the fragmentation in the removing device will be preserved
121 * - we'll do larger allocations, which may fail and fall back on smaller
124 int vdev_removal_max_span = 32 * 1024;
127 * This is used by the test suite so that it can ensure that certain
128 * actions happen while in the middle of a removal.
130 uint64_t zfs_remove_max_bytes_pause = UINT64_MAX;
132 #define VDEV_REMOVAL_ZAP_OBJS "lzap"
134 static void spa_vdev_remove_thread(void *arg);
137 spa_sync_removing_state(spa_t *spa, dmu_tx_t *tx)
139 VERIFY0(zap_update(spa->spa_dsl_pool->dp_meta_objset,
140 DMU_POOL_DIRECTORY_OBJECT,
141 DMU_POOL_REMOVING, sizeof (uint64_t),
142 sizeof (spa->spa_removing_phys) / sizeof (uint64_t),
143 &spa->spa_removing_phys, tx));
147 spa_nvlist_lookup_by_guid(nvlist_t **nvpp, int count, uint64_t target_guid)
149 for (int i = 0; i < count; i++) {
151 fnvlist_lookup_uint64(nvpp[i], ZPOOL_CONFIG_GUID);
153 if (guid == target_guid)
161 spa_vdev_remove_aux(nvlist_t *config, char *name, nvlist_t **dev, int count,
162 nvlist_t *dev_to_remove)
164 nvlist_t **newdev = NULL;
167 newdev = kmem_alloc((count - 1) * sizeof (void *), KM_SLEEP);
169 for (int i = 0, j = 0; i < count; i++) {
170 if (dev[i] == dev_to_remove)
172 VERIFY(nvlist_dup(dev[i], &newdev[j++], KM_SLEEP) == 0);
175 VERIFY(nvlist_remove(config, name, DATA_TYPE_NVLIST_ARRAY) == 0);
176 VERIFY(nvlist_add_nvlist_array(config, name, newdev, count - 1) == 0);
178 for (int i = 0; i < count - 1; i++)
179 nvlist_free(newdev[i]);
182 kmem_free(newdev, (count - 1) * sizeof (void *));
185 static spa_vdev_removal_t *
186 spa_vdev_removal_create(vdev_t *vd)
188 spa_vdev_removal_t *svr = kmem_zalloc(sizeof (*svr), KM_SLEEP);
189 mutex_init(&svr->svr_lock, NULL, MUTEX_DEFAULT, NULL);
190 cv_init(&svr->svr_cv, NULL, CV_DEFAULT, NULL);
191 svr->svr_allocd_segs = range_tree_create(NULL, NULL);
192 svr->svr_vdev_id = vd->vdev_id;
194 for (int i = 0; i < TXG_SIZE; i++) {
195 svr->svr_frees[i] = range_tree_create(NULL, NULL);
196 list_create(&svr->svr_new_segments[i],
197 sizeof (vdev_indirect_mapping_entry_t),
198 offsetof(vdev_indirect_mapping_entry_t, vime_node));
205 spa_vdev_removal_destroy(spa_vdev_removal_t *svr)
207 for (int i = 0; i < TXG_SIZE; i++) {
208 ASSERT0(svr->svr_bytes_done[i]);
209 ASSERT0(svr->svr_max_offset_to_sync[i]);
210 range_tree_destroy(svr->svr_frees[i]);
211 list_destroy(&svr->svr_new_segments[i]);
214 range_tree_destroy(svr->svr_allocd_segs);
215 mutex_destroy(&svr->svr_lock);
216 cv_destroy(&svr->svr_cv);
217 kmem_free(svr, sizeof (*svr));
221 * This is called as a synctask in the txg in which we will mark this vdev
222 * as removing (in the config stored in the MOS).
224 * It begins the evacuation of a toplevel vdev by:
225 * - initializing the spa_removing_phys which tracks this removal
226 * - computing the amount of space to remove for accounting purposes
227 * - dirtying all dbufs in the spa_config_object
228 * - creating the spa_vdev_removal
229 * - starting the spa_vdev_remove_thread
232 vdev_remove_initiate_sync(void *arg, dmu_tx_t *tx)
234 int vdev_id = (uintptr_t)arg;
235 spa_t *spa = dmu_tx_pool(tx)->dp_spa;
236 vdev_t *vd = vdev_lookup_top(spa, vdev_id);
237 vdev_indirect_config_t *vic = &vd->vdev_indirect_config;
238 objset_t *mos = spa->spa_dsl_pool->dp_meta_objset;
239 spa_vdev_removal_t *svr = NULL;
240 uint64_t txg = dmu_tx_get_txg(tx);
242 ASSERT3P(vd->vdev_ops, !=, &vdev_raidz_ops);
243 svr = spa_vdev_removal_create(vd);
245 ASSERT(vd->vdev_removing);
246 ASSERT3P(vd->vdev_indirect_mapping, ==, NULL);
248 spa_feature_incr(spa, SPA_FEATURE_DEVICE_REMOVAL, tx);
249 if (spa_feature_is_enabled(spa, SPA_FEATURE_OBSOLETE_COUNTS)) {
251 * By activating the OBSOLETE_COUNTS feature, we prevent
252 * the pool from being downgraded and ensure that the
253 * refcounts are precise.
255 spa_feature_incr(spa, SPA_FEATURE_OBSOLETE_COUNTS, tx);
257 VERIFY0(zap_add(spa->spa_meta_objset, vd->vdev_top_zap,
258 VDEV_TOP_ZAP_OBSOLETE_COUNTS_ARE_PRECISE, sizeof (one), 1,
260 ASSERT3U(vdev_obsolete_counts_are_precise(vd), !=, 0);
263 vic->vic_mapping_object = vdev_indirect_mapping_alloc(mos, tx);
264 vd->vdev_indirect_mapping =
265 vdev_indirect_mapping_open(mos, vic->vic_mapping_object);
266 vic->vic_births_object = vdev_indirect_births_alloc(mos, tx);
267 vd->vdev_indirect_births =
268 vdev_indirect_births_open(mos, vic->vic_births_object);
269 spa->spa_removing_phys.sr_removing_vdev = vd->vdev_id;
270 spa->spa_removing_phys.sr_start_time = gethrestime_sec();
271 spa->spa_removing_phys.sr_end_time = 0;
272 spa->spa_removing_phys.sr_state = DSS_SCANNING;
273 spa->spa_removing_phys.sr_to_copy = 0;
274 spa->spa_removing_phys.sr_copied = 0;
277 * Note: We can't use vdev_stat's vs_alloc for sr_to_copy, because
278 * there may be space in the defer tree, which is free, but still
279 * counted in vs_alloc.
281 for (uint64_t i = 0; i < vd->vdev_ms_count; i++) {
282 metaslab_t *ms = vd->vdev_ms[i];
283 if (ms->ms_sm == NULL)
286 spa->spa_removing_phys.sr_to_copy +=
287 metaslab_allocated_space(ms);
290 * Space which we are freeing this txg does not need to
293 spa->spa_removing_phys.sr_to_copy -=
294 range_tree_space(ms->ms_freeing);
296 ASSERT0(range_tree_space(ms->ms_freed));
297 for (int t = 0; t < TXG_SIZE; t++)
298 ASSERT0(range_tree_space(ms->ms_allocating[t]));
302 * Sync tasks are called before metaslab_sync(), so there should
303 * be no already-synced metaslabs in the TXG_CLEAN list.
305 ASSERT3P(txg_list_head(&vd->vdev_ms_list, TXG_CLEAN(txg)), ==, NULL);
307 spa_sync_removing_state(spa, tx);
310 * All blocks that we need to read the most recent mapping must be
311 * stored on concrete vdevs. Therefore, we must dirty anything that
312 * is read before spa_remove_init(). Specifically, the
313 * spa_config_object. (Note that although we already modified the
314 * spa_config_object in spa_sync_removing_state, that may not have
315 * modified all blocks of the object.)
317 dmu_object_info_t doi;
318 VERIFY0(dmu_object_info(mos, DMU_POOL_DIRECTORY_OBJECT, &doi));
319 for (uint64_t offset = 0; offset < doi.doi_max_offset; ) {
321 VERIFY0(dmu_buf_hold(mos, DMU_POOL_DIRECTORY_OBJECT,
322 offset, FTAG, &dbuf, 0));
323 dmu_buf_will_dirty(dbuf, tx);
324 offset += dbuf->db_size;
325 dmu_buf_rele(dbuf, FTAG);
329 * Now that we've allocated the im_object, dirty the vdev to ensure
330 * that the object gets written to the config on disk.
332 vdev_config_dirty(vd);
334 zfs_dbgmsg("starting removal thread for vdev %llu (%p) in txg %llu "
335 "im_obj=%llu", vd->vdev_id, vd, dmu_tx_get_txg(tx),
336 vic->vic_mapping_object);
338 spa_history_log_internal(spa, "vdev remove started", tx,
339 "%s vdev %llu %s", spa_name(spa), vd->vdev_id,
340 (vd->vdev_path != NULL) ? vd->vdev_path : "-");
342 * Setting spa_vdev_removal causes subsequent frees to call
343 * free_from_removing_vdev(). Note that we don't need any locking
344 * because we are the sync thread, and metaslab_free_impl() is only
345 * called from syncing context (potentially from a zio taskq thread,
346 * but in any case only when there are outstanding free i/os, which
349 ASSERT3P(spa->spa_vdev_removal, ==, NULL);
350 spa->spa_vdev_removal = svr;
351 svr->svr_thread = thread_create(NULL, 0,
352 spa_vdev_remove_thread, spa, 0, &p0, TS_RUN, minclsyspri);
356 * When we are opening a pool, we must read the mapping for each
357 * indirect vdev in order from most recently removed to least
358 * recently removed. We do this because the blocks for the mapping
359 * of older indirect vdevs may be stored on more recently removed vdevs.
360 * In order to read each indirect mapping object, we must have
361 * initialized all more recently removed vdevs.
364 spa_remove_init(spa_t *spa)
368 error = zap_lookup(spa->spa_dsl_pool->dp_meta_objset,
369 DMU_POOL_DIRECTORY_OBJECT,
370 DMU_POOL_REMOVING, sizeof (uint64_t),
371 sizeof (spa->spa_removing_phys) / sizeof (uint64_t),
372 &spa->spa_removing_phys);
374 if (error == ENOENT) {
375 spa->spa_removing_phys.sr_state = DSS_NONE;
376 spa->spa_removing_phys.sr_removing_vdev = -1;
377 spa->spa_removing_phys.sr_prev_indirect_vdev = -1;
378 spa->spa_indirect_vdevs_loaded = B_TRUE;
380 } else if (error != 0) {
384 if (spa->spa_removing_phys.sr_state == DSS_SCANNING) {
386 * We are currently removing a vdev. Create and
387 * initialize a spa_vdev_removal_t from the bonus
388 * buffer of the removing vdevs vdev_im_object, and
389 * initialize its partial mapping.
391 spa_config_enter(spa, SCL_STATE, FTAG, RW_READER);
392 vdev_t *vd = vdev_lookup_top(spa,
393 spa->spa_removing_phys.sr_removing_vdev);
396 spa_config_exit(spa, SCL_STATE, FTAG);
400 vdev_indirect_config_t *vic = &vd->vdev_indirect_config;
402 ASSERT(vdev_is_concrete(vd));
403 spa_vdev_removal_t *svr = spa_vdev_removal_create(vd);
404 ASSERT3U(svr->svr_vdev_id, ==, vd->vdev_id);
405 ASSERT(vd->vdev_removing);
407 vd->vdev_indirect_mapping = vdev_indirect_mapping_open(
408 spa->spa_meta_objset, vic->vic_mapping_object);
409 vd->vdev_indirect_births = vdev_indirect_births_open(
410 spa->spa_meta_objset, vic->vic_births_object);
411 spa_config_exit(spa, SCL_STATE, FTAG);
413 spa->spa_vdev_removal = svr;
416 spa_config_enter(spa, SCL_STATE, FTAG, RW_READER);
417 uint64_t indirect_vdev_id =
418 spa->spa_removing_phys.sr_prev_indirect_vdev;
419 while (indirect_vdev_id != UINT64_MAX) {
420 vdev_t *vd = vdev_lookup_top(spa, indirect_vdev_id);
421 vdev_indirect_config_t *vic = &vd->vdev_indirect_config;
423 ASSERT3P(vd->vdev_ops, ==, &vdev_indirect_ops);
424 vd->vdev_indirect_mapping = vdev_indirect_mapping_open(
425 spa->spa_meta_objset, vic->vic_mapping_object);
426 vd->vdev_indirect_births = vdev_indirect_births_open(
427 spa->spa_meta_objset, vic->vic_births_object);
429 indirect_vdev_id = vic->vic_prev_indirect_vdev;
431 spa_config_exit(spa, SCL_STATE, FTAG);
434 * Now that we've loaded all the indirect mappings, we can allow
435 * reads from other blocks (e.g. via predictive prefetch).
437 spa->spa_indirect_vdevs_loaded = B_TRUE;
442 spa_restart_removal(spa_t *spa)
444 spa_vdev_removal_t *svr = spa->spa_vdev_removal;
450 * In general when this function is called there is no
451 * removal thread running. The only scenario where this
452 * is not true is during spa_import() where this function
453 * is called twice [once from spa_import_impl() and
454 * spa_async_resume()]. Thus, in the scenario where we
455 * import a pool that has an ongoing removal we don't
456 * want to spawn a second thread.
458 if (svr->svr_thread != NULL)
461 if (!spa_writeable(spa))
464 zfs_dbgmsg("restarting removal of %llu", svr->svr_vdev_id);
465 svr->svr_thread = thread_create(NULL, 0, spa_vdev_remove_thread, spa,
466 0, &p0, TS_RUN, minclsyspri);
470 * Process freeing from a device which is in the middle of being removed.
471 * We must handle this carefully so that we attempt to copy freed data,
472 * and we correctly free already-copied data.
475 free_from_removing_vdev(vdev_t *vd, uint64_t offset, uint64_t size)
477 spa_t *spa = vd->vdev_spa;
478 spa_vdev_removal_t *svr = spa->spa_vdev_removal;
479 vdev_indirect_mapping_t *vim = vd->vdev_indirect_mapping;
480 uint64_t txg = spa_syncing_txg(spa);
481 uint64_t max_offset_yet = 0;
483 ASSERT(vd->vdev_indirect_config.vic_mapping_object != 0);
484 ASSERT3U(vd->vdev_indirect_config.vic_mapping_object, ==,
485 vdev_indirect_mapping_object(vim));
486 ASSERT3U(vd->vdev_id, ==, svr->svr_vdev_id);
488 mutex_enter(&svr->svr_lock);
491 * Remove the segment from the removing vdev's spacemap. This
492 * ensures that we will not attempt to copy this space (if the
493 * removal thread has not yet visited it), and also ensures
494 * that we know what is actually allocated on the new vdevs
495 * (needed if we cancel the removal).
497 * Note: we must do the metaslab_free_concrete() with the svr_lock
498 * held, so that the remove_thread can not load this metaslab and then
499 * visit this offset between the time that we metaslab_free_concrete()
500 * and when we check to see if it has been visited.
502 * Note: The checkpoint flag is set to false as having/taking
503 * a checkpoint and removing a device can't happen at the same
506 ASSERT(!spa_has_checkpoint(spa));
507 metaslab_free_concrete(vd, offset, size, B_FALSE);
509 uint64_t synced_size = 0;
510 uint64_t synced_offset = 0;
511 uint64_t max_offset_synced = vdev_indirect_mapping_max_offset(vim);
512 if (offset < max_offset_synced) {
514 * The mapping for this offset is already on disk.
515 * Free from the new location.
517 * Note that we use svr_max_synced_offset because it is
518 * updated atomically with respect to the in-core mapping.
519 * By contrast, vim_max_offset is not.
521 * This block may be split between a synced entry and an
522 * in-flight or unvisited entry. Only process the synced
523 * portion of it here.
525 synced_size = MIN(size, max_offset_synced - offset);
526 synced_offset = offset;
528 ASSERT3U(max_offset_yet, <=, max_offset_synced);
529 max_offset_yet = max_offset_synced;
531 DTRACE_PROBE3(remove__free__synced,
534 uint64_t, synced_size);
537 offset += synced_size;
541 * Look at all in-flight txgs starting from the currently syncing one
542 * and see if a section of this free is being copied. By starting from
543 * this txg and iterating forward, we might find that this region
544 * was copied in two different txgs and handle it appropriately.
546 for (int i = 0; i < TXG_CONCURRENT_STATES; i++) {
547 int txgoff = (txg + i) & TXG_MASK;
548 if (size > 0 && offset < svr->svr_max_offset_to_sync[txgoff]) {
550 * The mapping for this offset is in flight, and
551 * will be synced in txg+i.
553 uint64_t inflight_size = MIN(size,
554 svr->svr_max_offset_to_sync[txgoff] - offset);
556 DTRACE_PROBE4(remove__free__inflight,
559 uint64_t, inflight_size,
563 * We copy data in order of increasing offset.
564 * Therefore the max_offset_to_sync[] must increase
565 * (or be zero, indicating that nothing is being
566 * copied in that txg).
568 if (svr->svr_max_offset_to_sync[txgoff] != 0) {
569 ASSERT3U(svr->svr_max_offset_to_sync[txgoff],
572 svr->svr_max_offset_to_sync[txgoff];
576 * We've already committed to copying this segment:
577 * we have allocated space elsewhere in the pool for
578 * it and have an IO outstanding to copy the data. We
579 * cannot free the space before the copy has
580 * completed, or else the copy IO might overwrite any
581 * new data. To free that space, we record the
582 * segment in the appropriate svr_frees tree and free
583 * the mapped space later, in the txg where we have
584 * completed the copy and synced the mapping (see
585 * vdev_mapping_sync).
587 range_tree_add(svr->svr_frees[txgoff],
588 offset, inflight_size);
589 size -= inflight_size;
590 offset += inflight_size;
593 * This space is already accounted for as being
594 * done, because it is being copied in txg+i.
595 * However, if i!=0, then it is being copied in
596 * a future txg. If we crash after this txg
597 * syncs but before txg+i syncs, then the space
598 * will be free. Therefore we must account
599 * for the space being done in *this* txg
600 * (when it is freed) rather than the future txg
601 * (when it will be copied).
603 ASSERT3U(svr->svr_bytes_done[txgoff], >=,
605 svr->svr_bytes_done[txgoff] -= inflight_size;
606 svr->svr_bytes_done[txg & TXG_MASK] += inflight_size;
609 ASSERT0(svr->svr_max_offset_to_sync[TXG_CLEAN(txg) & TXG_MASK]);
613 * The copy thread has not yet visited this offset. Ensure
617 DTRACE_PROBE3(remove__free__unvisited,
622 if (svr->svr_allocd_segs != NULL)
623 range_tree_clear(svr->svr_allocd_segs, offset, size);
626 * Since we now do not need to copy this data, for
627 * accounting purposes we have done our job and can count
630 svr->svr_bytes_done[txg & TXG_MASK] += size;
632 mutex_exit(&svr->svr_lock);
635 * Now that we have dropped svr_lock, process the synced portion
638 if (synced_size > 0) {
639 vdev_indirect_mark_obsolete(vd, synced_offset, synced_size);
642 * Note: this can only be called from syncing context,
643 * and the vdev_indirect_mapping is only changed from the
644 * sync thread, so we don't need svr_lock while doing
645 * metaslab_free_impl_cb.
647 boolean_t checkpoint = B_FALSE;
648 vdev_indirect_ops.vdev_op_remap(vd, synced_offset, synced_size,
649 metaslab_free_impl_cb, &checkpoint);
654 * Stop an active removal and update the spa_removing phys.
657 spa_finish_removal(spa_t *spa, dsl_scan_state_t state, dmu_tx_t *tx)
659 spa_vdev_removal_t *svr = spa->spa_vdev_removal;
660 ASSERT3U(dmu_tx_get_txg(tx), ==, spa_syncing_txg(spa));
662 /* Ensure the removal thread has completed before we free the svr. */
663 spa_vdev_remove_suspend(spa);
665 ASSERT(state == DSS_FINISHED || state == DSS_CANCELED);
667 if (state == DSS_FINISHED) {
668 spa_removing_phys_t *srp = &spa->spa_removing_phys;
669 vdev_t *vd = vdev_lookup_top(spa, svr->svr_vdev_id);
670 vdev_indirect_config_t *vic = &vd->vdev_indirect_config;
672 if (srp->sr_prev_indirect_vdev != UINT64_MAX) {
673 vdev_t *pvd = vdev_lookup_top(spa,
674 srp->sr_prev_indirect_vdev);
675 ASSERT3P(pvd->vdev_ops, ==, &vdev_indirect_ops);
678 vic->vic_prev_indirect_vdev = srp->sr_prev_indirect_vdev;
679 srp->sr_prev_indirect_vdev = vd->vdev_id;
681 spa->spa_removing_phys.sr_state = state;
682 spa->spa_removing_phys.sr_end_time = gethrestime_sec();
684 spa->spa_vdev_removal = NULL;
685 spa_vdev_removal_destroy(svr);
687 spa_sync_removing_state(spa, tx);
689 vdev_config_dirty(spa->spa_root_vdev);
693 free_mapped_segment_cb(void *arg, uint64_t offset, uint64_t size)
696 vdev_indirect_mark_obsolete(vd, offset, size);
697 boolean_t checkpoint = B_FALSE;
698 vdev_indirect_ops.vdev_op_remap(vd, offset, size,
699 metaslab_free_impl_cb, &checkpoint);
703 * On behalf of the removal thread, syncs an incremental bit more of
704 * the indirect mapping to disk and updates the in-memory mapping.
705 * Called as a sync task in every txg that the removal thread makes progress.
708 vdev_mapping_sync(void *arg, dmu_tx_t *tx)
710 spa_vdev_removal_t *svr = arg;
711 spa_t *spa = dmu_tx_pool(tx)->dp_spa;
712 vdev_t *vd = vdev_lookup_top(spa, svr->svr_vdev_id);
713 vdev_indirect_config_t *vic = &vd->vdev_indirect_config;
714 uint64_t txg = dmu_tx_get_txg(tx);
715 vdev_indirect_mapping_t *vim = vd->vdev_indirect_mapping;
717 ASSERT(vic->vic_mapping_object != 0);
718 ASSERT3U(txg, ==, spa_syncing_txg(spa));
720 vdev_indirect_mapping_add_entries(vim,
721 &svr->svr_new_segments[txg & TXG_MASK], tx);
722 vdev_indirect_births_add_entry(vd->vdev_indirect_births,
723 vdev_indirect_mapping_max_offset(vim), dmu_tx_get_txg(tx), tx);
726 * Free the copied data for anything that was freed while the
727 * mapping entries were in flight.
729 mutex_enter(&svr->svr_lock);
730 range_tree_vacate(svr->svr_frees[txg & TXG_MASK],
731 free_mapped_segment_cb, vd);
732 ASSERT3U(svr->svr_max_offset_to_sync[txg & TXG_MASK], >=,
733 vdev_indirect_mapping_max_offset(vim));
734 svr->svr_max_offset_to_sync[txg & TXG_MASK] = 0;
735 mutex_exit(&svr->svr_lock);
737 spa_sync_removing_state(spa, tx);
740 typedef struct vdev_copy_segment_arg {
742 dva_t *vcsa_dest_dva;
744 range_tree_t *vcsa_obsolete_segs;
745 } vdev_copy_segment_arg_t;
748 unalloc_seg(void *arg, uint64_t start, uint64_t size)
750 vdev_copy_segment_arg_t *vcsa = arg;
751 spa_t *spa = vcsa->vcsa_spa;
754 BP_SET_BIRTH(&bp, TXG_INITIAL, TXG_INITIAL);
755 BP_SET_LSIZE(&bp, size);
756 BP_SET_PSIZE(&bp, size);
757 BP_SET_COMPRESS(&bp, ZIO_COMPRESS_OFF);
758 BP_SET_CHECKSUM(&bp, ZIO_CHECKSUM_OFF);
759 BP_SET_TYPE(&bp, DMU_OT_NONE);
760 BP_SET_LEVEL(&bp, 0);
761 BP_SET_DEDUP(&bp, 0);
762 BP_SET_BYTEORDER(&bp, ZFS_HOST_BYTEORDER);
764 DVA_SET_VDEV(&bp.blk_dva[0], DVA_GET_VDEV(vcsa->vcsa_dest_dva));
765 DVA_SET_OFFSET(&bp.blk_dva[0],
766 DVA_GET_OFFSET(vcsa->vcsa_dest_dva) + start);
767 DVA_SET_ASIZE(&bp.blk_dva[0], size);
769 zio_free(spa, vcsa->vcsa_txg, &bp);
773 * All reads and writes associated with a call to spa_vdev_copy_segment()
777 spa_vdev_copy_segment_done(zio_t *zio)
779 vdev_copy_segment_arg_t *vcsa = zio->io_private;
781 range_tree_vacate(vcsa->vcsa_obsolete_segs,
783 range_tree_destroy(vcsa->vcsa_obsolete_segs);
784 kmem_free(vcsa, sizeof (*vcsa));
786 spa_config_exit(zio->io_spa, SCL_STATE, zio->io_spa);
790 * The write of the new location is done.
793 spa_vdev_copy_segment_write_done(zio_t *zio)
795 vdev_copy_arg_t *vca = zio->io_private;
797 abd_free(zio->io_abd);
799 mutex_enter(&vca->vca_lock);
800 vca->vca_outstanding_bytes -= zio->io_size;
801 cv_signal(&vca->vca_cv);
802 mutex_exit(&vca->vca_lock);
806 * The read of the old location is done. The parent zio is the write to
807 * the new location. Allow it to start.
810 spa_vdev_copy_segment_read_done(zio_t *zio)
812 zio_nowait(zio_unique_parent(zio));
816 * If the old and new vdevs are mirrors, we will read both sides of the old
817 * mirror, and write each copy to the corresponding side of the new mirror.
818 * If the old and new vdevs have a different number of children, we will do
819 * this as best as possible. Since we aren't verifying checksums, this
820 * ensures that as long as there's a good copy of the data, we'll have a
821 * good copy after the removal, even if there's silent damage to one side
822 * of the mirror. If we're removing a mirror that has some silent damage,
823 * we'll have exactly the same damage in the new location (assuming that
824 * the new location is also a mirror).
826 * We accomplish this by creating a tree of zio_t's, with as many writes as
827 * there are "children" of the new vdev (a non-redundant vdev counts as one
828 * child, a 2-way mirror has 2 children, etc). Each write has an associated
829 * read from a child of the old vdev. Typically there will be the same
830 * number of children of the old and new vdevs. However, if there are more
831 * children of the new vdev, some child(ren) of the old vdev will be issued
832 * multiple reads. If there are more children of the old vdev, some copies
835 * For example, the tree of zio_t's for a 2-way mirror is:
839 * write(new vdev, child 0) write(new vdev, child 1)
841 * read(old vdev, child 0) read(old vdev, child 1)
843 * Child zio's complete before their parents complete. However, zio's
844 * created with zio_vdev_child_io() may be issued before their children
845 * complete. In this case we need to make sure that the children (reads)
846 * complete before the parents (writes) are *issued*. We do this by not
847 * calling zio_nowait() on each write until its corresponding read has
850 * The spa_config_lock must be held while zio's created by
851 * zio_vdev_child_io() are in progress, to ensure that the vdev tree does
852 * not change (e.g. due to a concurrent "zpool attach/detach"). The "null"
853 * zio is needed to release the spa_config_lock after all the reads and
854 * writes complete. (Note that we can't grab the config lock for each read,
855 * because it is not reentrant - we could deadlock with a thread waiting
859 spa_vdev_copy_one_child(vdev_copy_arg_t *vca, zio_t *nzio,
860 vdev_t *source_vd, uint64_t source_offset,
861 vdev_t *dest_child_vd, uint64_t dest_offset, int dest_id, uint64_t size)
863 ASSERT3U(spa_config_held(nzio->io_spa, SCL_ALL, RW_READER), !=, 0);
865 mutex_enter(&vca->vca_lock);
866 vca->vca_outstanding_bytes += size;
867 mutex_exit(&vca->vca_lock);
869 abd_t *abd = abd_alloc_for_io(size, B_FALSE);
871 vdev_t *source_child_vd;
872 if (source_vd->vdev_ops == &vdev_mirror_ops && dest_id != -1) {
874 * Source and dest are both mirrors. Copy from the same
875 * child id as we are copying to (wrapping around if there
876 * are more dest children than source children).
879 source_vd->vdev_child[dest_id % source_vd->vdev_children];
881 source_child_vd = source_vd;
884 zio_t *write_zio = zio_vdev_child_io(nzio, NULL,
885 dest_child_vd, dest_offset, abd, size,
886 ZIO_TYPE_WRITE, ZIO_PRIORITY_REMOVAL,
888 spa_vdev_copy_segment_write_done, vca);
890 zio_nowait(zio_vdev_child_io(write_zio, NULL,
891 source_child_vd, source_offset, abd, size,
892 ZIO_TYPE_READ, ZIO_PRIORITY_REMOVAL,
894 spa_vdev_copy_segment_read_done, vca));
898 * Allocate a new location for this segment, and create the zio_t's to
899 * read from the old location and write to the new location.
902 spa_vdev_copy_segment(vdev_t *vd, range_tree_t *segs,
903 uint64_t maxalloc, uint64_t txg,
904 vdev_copy_arg_t *vca, zio_alloc_list_t *zal)
906 metaslab_group_t *mg = vd->vdev_mg;
907 spa_t *spa = vd->vdev_spa;
908 spa_vdev_removal_t *svr = spa->spa_vdev_removal;
909 vdev_indirect_mapping_entry_t *entry;
911 uint64_t start = range_tree_min(segs);
913 ASSERT3U(maxalloc, <=, SPA_MAXBLOCKSIZE);
915 uint64_t size = range_tree_span(segs);
916 if (range_tree_span(segs) > maxalloc) {
918 * We can't allocate all the segments. Prefer to end
919 * the allocation at the end of a segment, thus avoiding
920 * additional split blocks.
924 search.rs_start = start + maxalloc;
925 search.rs_end = search.rs_start;
926 range_seg_t *rs = avl_find(&segs->rt_root, &search, &where);
928 rs = avl_nearest(&segs->rt_root, where, AVL_BEFORE);
930 rs = AVL_PREV(&segs->rt_root, rs);
933 size = rs->rs_end - start;
936 * There are no segments that end before maxalloc.
937 * I.e. the first segment is larger than maxalloc,
938 * so we must split it.
943 ASSERT3U(size, <=, maxalloc);
946 * An allocation class might not have any remaining vdevs or space
948 metaslab_class_t *mc = mg->mg_class;
949 if (mc != spa_normal_class(spa) && mc->mc_groups <= 1)
950 mc = spa_normal_class(spa);
951 int error = metaslab_alloc_dva(spa, mc, size, &dst, 0, NULL, txg, 0,
953 if (error == ENOSPC && mc != spa_normal_class(spa)) {
954 error = metaslab_alloc_dva(spa, spa_normal_class(spa), size,
955 &dst, 0, NULL, txg, 0, zal, 0);
961 * Determine the ranges that are not actually needed. Offsets are
962 * relative to the start of the range to be copied (i.e. relative to the
963 * local variable "start").
965 range_tree_t *obsolete_segs = range_tree_create(NULL, NULL);
967 range_seg_t *rs = avl_first(&segs->rt_root);
968 ASSERT3U(rs->rs_start, ==, start);
969 uint64_t prev_seg_end = rs->rs_end;
970 while ((rs = AVL_NEXT(&segs->rt_root, rs)) != NULL) {
971 if (rs->rs_start >= start + size) {
974 range_tree_add(obsolete_segs,
975 prev_seg_end - start,
976 rs->rs_start - prev_seg_end);
978 prev_seg_end = rs->rs_end;
980 /* We don't end in the middle of an obsolete range */
981 ASSERT3U(start + size, <=, prev_seg_end);
983 range_tree_clear(segs, start, size);
986 * We can't have any padding of the allocated size, otherwise we will
987 * misunderstand what's allocated, and the size of the mapping.
988 * The caller ensures this will be true by passing in a size that is
989 * aligned to the worst (highest) ashift in the pool.
991 ASSERT3U(DVA_GET_ASIZE(&dst), ==, size);
993 entry = kmem_zalloc(sizeof (vdev_indirect_mapping_entry_t), KM_SLEEP);
994 DVA_MAPPING_SET_SRC_OFFSET(&entry->vime_mapping, start);
995 entry->vime_mapping.vimep_dst = dst;
996 if (spa_feature_is_enabled(spa, SPA_FEATURE_OBSOLETE_COUNTS)) {
997 entry->vime_obsolete_count = range_tree_space(obsolete_segs);
1000 vdev_copy_segment_arg_t *vcsa = kmem_zalloc(sizeof (*vcsa), KM_SLEEP);
1001 vcsa->vcsa_dest_dva = &entry->vime_mapping.vimep_dst;
1002 vcsa->vcsa_obsolete_segs = obsolete_segs;
1003 vcsa->vcsa_spa = spa;
1004 vcsa->vcsa_txg = txg;
1007 * See comment before spa_vdev_copy_one_child().
1009 spa_config_enter(spa, SCL_STATE, spa, RW_READER);
1010 zio_t *nzio = zio_null(spa->spa_txg_zio[txg & TXG_MASK], spa, NULL,
1011 spa_vdev_copy_segment_done, vcsa, 0);
1012 vdev_t *dest_vd = vdev_lookup_top(spa, DVA_GET_VDEV(&dst));
1013 if (dest_vd->vdev_ops == &vdev_mirror_ops) {
1014 for (int i = 0; i < dest_vd->vdev_children; i++) {
1015 vdev_t *child = dest_vd->vdev_child[i];
1016 spa_vdev_copy_one_child(vca, nzio, vd, start,
1017 child, DVA_GET_OFFSET(&dst), i, size);
1020 spa_vdev_copy_one_child(vca, nzio, vd, start,
1021 dest_vd, DVA_GET_OFFSET(&dst), -1, size);
1025 list_insert_tail(&svr->svr_new_segments[txg & TXG_MASK], entry);
1026 ASSERT3U(start + size, <=, vd->vdev_ms_count << vd->vdev_ms_shift);
1027 vdev_dirty(vd, 0, NULL, txg);
1033 * Complete the removal of a toplevel vdev. This is called as a
1034 * synctask in the same txg that we will sync out the new config (to the
1035 * MOS object) which indicates that this vdev is indirect.
1038 vdev_remove_complete_sync(void *arg, dmu_tx_t *tx)
1040 spa_vdev_removal_t *svr = arg;
1041 spa_t *spa = dmu_tx_pool(tx)->dp_spa;
1042 vdev_t *vd = vdev_lookup_top(spa, svr->svr_vdev_id);
1044 ASSERT3P(vd->vdev_ops, ==, &vdev_indirect_ops);
1046 for (int i = 0; i < TXG_SIZE; i++) {
1047 ASSERT0(svr->svr_bytes_done[i]);
1050 ASSERT3U(spa->spa_removing_phys.sr_copied, ==,
1051 spa->spa_removing_phys.sr_to_copy);
1053 vdev_destroy_spacemaps(vd, tx);
1055 /* destroy leaf zaps, if any */
1056 ASSERT3P(svr->svr_zaplist, !=, NULL);
1057 for (nvpair_t *pair = nvlist_next_nvpair(svr->svr_zaplist, NULL);
1059 pair = nvlist_next_nvpair(svr->svr_zaplist, pair)) {
1060 vdev_destroy_unlink_zap(vd, fnvpair_value_uint64(pair), tx);
1062 fnvlist_free(svr->svr_zaplist);
1064 spa_finish_removal(dmu_tx_pool(tx)->dp_spa, DSS_FINISHED, tx);
1065 /* vd->vdev_path is not available here */
1066 spa_history_log_internal(spa, "vdev remove completed", tx,
1067 "%s vdev %llu", spa_name(spa), vd->vdev_id);
1071 vdev_remove_enlist_zaps(vdev_t *vd, nvlist_t *zlist)
1073 ASSERT3P(zlist, !=, NULL);
1074 ASSERT3P(vd->vdev_ops, !=, &vdev_raidz_ops);
1076 if (vd->vdev_leaf_zap != 0) {
1078 (void) snprintf(zkey, sizeof (zkey), "%s-%ju",
1079 VDEV_REMOVAL_ZAP_OBJS, (uintmax_t)vd->vdev_leaf_zap);
1080 fnvlist_add_uint64(zlist, zkey, vd->vdev_leaf_zap);
1083 for (uint64_t id = 0; id < vd->vdev_children; id++) {
1084 vdev_remove_enlist_zaps(vd->vdev_child[id], zlist);
1089 vdev_remove_replace_with_indirect(vdev_t *vd, uint64_t txg)
1093 spa_t *spa = vd->vdev_spa;
1094 spa_vdev_removal_t *svr = spa->spa_vdev_removal;
1097 * First, build a list of leaf zaps to be destroyed.
1098 * This is passed to the sync context thread,
1099 * which does the actual unlinking.
1101 svr->svr_zaplist = fnvlist_alloc();
1102 vdev_remove_enlist_zaps(vd, svr->svr_zaplist);
1104 ivd = vdev_add_parent(vd, &vdev_indirect_ops);
1105 ivd->vdev_removing = 0;
1107 vd->vdev_leaf_zap = 0;
1109 vdev_remove_child(ivd, vd);
1110 vdev_compact_children(ivd);
1112 ASSERT(!list_link_active(&vd->vdev_state_dirty_node));
1114 tx = dmu_tx_create_assigned(spa->spa_dsl_pool, txg);
1115 dsl_sync_task_nowait(spa->spa_dsl_pool, vdev_remove_complete_sync, svr,
1116 0, ZFS_SPACE_CHECK_NONE, tx);
1120 * Indicate that this thread has exited.
1121 * After this, we can not use svr.
1123 mutex_enter(&svr->svr_lock);
1124 svr->svr_thread = NULL;
1125 cv_broadcast(&svr->svr_cv);
1126 mutex_exit(&svr->svr_lock);
1130 * Complete the removal of a toplevel vdev. This is called in open
1131 * context by the removal thread after we have copied all vdev's data.
1134 vdev_remove_complete(spa_t *spa)
1139 * Wait for any deferred frees to be synced before we call
1140 * vdev_metaslab_fini()
1142 txg_wait_synced(spa->spa_dsl_pool, 0);
1143 txg = spa_vdev_enter(spa);
1144 vdev_t *vd = vdev_lookup_top(spa, spa->spa_vdev_removal->svr_vdev_id);
1145 ASSERT3P(vd->vdev_initialize_thread, ==, NULL);
1147 sysevent_t *ev = spa_event_create(spa, vd, NULL,
1148 ESC_ZFS_VDEV_REMOVE_DEV);
1150 zfs_dbgmsg("finishing device removal for vdev %llu in txg %llu",
1154 * Discard allocation state.
1156 if (vd->vdev_mg != NULL) {
1157 vdev_metaslab_fini(vd);
1158 metaslab_group_destroy(vd->vdev_mg);
1161 ASSERT0(vd->vdev_stat.vs_space);
1162 ASSERT0(vd->vdev_stat.vs_dspace);
1164 vdev_remove_replace_with_indirect(vd, txg);
1167 * We now release the locks, allowing spa_sync to run and finish the
1168 * removal via vdev_remove_complete_sync in syncing context.
1170 * Note that we hold on to the vdev_t that has been replaced. Since
1171 * it isn't part of the vdev tree any longer, it can't be concurrently
1172 * manipulated, even while we don't have the config lock.
1174 (void) spa_vdev_exit(spa, NULL, txg, 0);
1177 * Top ZAP should have been transferred to the indirect vdev in
1178 * vdev_remove_replace_with_indirect.
1180 ASSERT0(vd->vdev_top_zap);
1183 * Leaf ZAP should have been moved in vdev_remove_replace_with_indirect.
1185 ASSERT0(vd->vdev_leaf_zap);
1187 txg = spa_vdev_enter(spa);
1188 (void) vdev_label_init(vd, 0, VDEV_LABEL_REMOVE);
1190 * Request to update the config and the config cachefile.
1192 vdev_config_dirty(spa->spa_root_vdev);
1193 (void) spa_vdev_exit(spa, vd, txg, 0);
1199 * Evacuates a segment of size at most max_alloc from the vdev
1200 * via repeated calls to spa_vdev_copy_segment. If an allocation
1201 * fails, the pool is probably too fragmented to handle such a
1202 * large size, so decrease max_alloc so that the caller will not try
1203 * this size again this txg.
1206 spa_vdev_copy_impl(vdev_t *vd, spa_vdev_removal_t *svr, vdev_copy_arg_t *vca,
1207 uint64_t *max_alloc, dmu_tx_t *tx)
1209 uint64_t txg = dmu_tx_get_txg(tx);
1210 spa_t *spa = dmu_tx_pool(tx)->dp_spa;
1212 mutex_enter(&svr->svr_lock);
1215 * Determine how big of a chunk to copy. We can allocate up
1216 * to max_alloc bytes, and we can span up to vdev_removal_max_span
1217 * bytes of unallocated space at a time. "segs" will track the
1218 * allocated segments that we are copying. We may also be copying
1219 * free segments (of up to vdev_removal_max_span bytes).
1221 range_tree_t *segs = range_tree_create(NULL, NULL);
1223 range_seg_t *rs = avl_first(&svr->svr_allocd_segs->rt_root);
1227 uint64_t seg_length;
1229 if (range_tree_is_empty(segs)) {
1230 /* need to truncate the first seg based on max_alloc */
1232 MIN(rs->rs_end - rs->rs_start, *max_alloc);
1234 if (rs->rs_start - range_tree_max(segs) >
1235 vdev_removal_max_span) {
1237 * Including this segment would cause us to
1238 * copy a larger unneeded chunk than is allowed.
1241 } else if (rs->rs_end - range_tree_min(segs) >
1244 * This additional segment would extend past
1245 * max_alloc. Rather than splitting this
1246 * segment, leave it for the next mapping.
1250 seg_length = rs->rs_end - rs->rs_start;
1254 range_tree_add(segs, rs->rs_start, seg_length);
1255 range_tree_remove(svr->svr_allocd_segs,
1256 rs->rs_start, seg_length);
1259 if (range_tree_is_empty(segs)) {
1260 mutex_exit(&svr->svr_lock);
1261 range_tree_destroy(segs);
1265 if (svr->svr_max_offset_to_sync[txg & TXG_MASK] == 0) {
1266 dsl_sync_task_nowait(dmu_tx_pool(tx), vdev_mapping_sync,
1267 svr, 0, ZFS_SPACE_CHECK_NONE, tx);
1270 svr->svr_max_offset_to_sync[txg & TXG_MASK] = range_tree_max(segs);
1273 * Note: this is the amount of *allocated* space
1274 * that we are taking care of each txg.
1276 svr->svr_bytes_done[txg & TXG_MASK] += range_tree_space(segs);
1278 mutex_exit(&svr->svr_lock);
1280 zio_alloc_list_t zal;
1281 metaslab_trace_init(&zal);
1282 uint64_t thismax = SPA_MAXBLOCKSIZE;
1283 while (!range_tree_is_empty(segs)) {
1284 int error = spa_vdev_copy_segment(vd,
1285 segs, thismax, txg, vca, &zal);
1287 if (error == ENOSPC) {
1289 * Cut our segment in half, and don't try this
1290 * segment size again this txg. Note that the
1291 * allocation size must be aligned to the highest
1292 * ashift in the pool, so that the allocation will
1293 * not be padded out to a multiple of the ashift,
1294 * which could cause us to think that this mapping
1295 * is larger than we intended.
1297 ASSERT3U(spa->spa_max_ashift, >=, SPA_MINBLOCKSHIFT);
1298 ASSERT3U(spa->spa_max_ashift, ==, spa->spa_min_ashift);
1299 uint64_t attempted =
1300 MIN(range_tree_span(segs), thismax);
1301 thismax = P2ROUNDUP(attempted / 2,
1302 1 << spa->spa_max_ashift);
1304 * The minimum-size allocation can not fail.
1306 ASSERT3U(attempted, >, 1 << spa->spa_max_ashift);
1307 *max_alloc = attempted - (1 << spa->spa_max_ashift);
1312 * We've performed an allocation, so reset the
1315 metaslab_trace_fini(&zal);
1316 metaslab_trace_init(&zal);
1319 metaslab_trace_fini(&zal);
1320 range_tree_destroy(segs);
1324 * The removal thread operates in open context. It iterates over all
1325 * allocated space in the vdev, by loading each metaslab's spacemap.
1326 * For each contiguous segment of allocated space (capping the segment
1327 * size at SPA_MAXBLOCKSIZE), we:
1328 * - Allocate space for it on another vdev.
1329 * - Create a new mapping from the old location to the new location
1330 * (as a record in svr_new_segments).
1331 * - Initiate a logical read zio to get the data off the removing disk.
1332 * - In the read zio's done callback, initiate a logical write zio to
1333 * write it to the new vdev.
1334 * Note that all of this will take effect when a particular TXG syncs.
1335 * The sync thread ensures that all the phys reads and writes for the syncing
1336 * TXG have completed (see spa_txg_zio) and writes the new mappings to disk
1337 * (see vdev_mapping_sync()).
1340 spa_vdev_remove_thread(void *arg)
1343 spa_vdev_removal_t *svr = spa->spa_vdev_removal;
1344 vdev_copy_arg_t vca;
1345 uint64_t max_alloc = zfs_remove_max_segment;
1346 uint64_t last_txg = 0;
1348 spa_config_enter(spa, SCL_CONFIG, FTAG, RW_READER);
1349 vdev_t *vd = vdev_lookup_top(spa, svr->svr_vdev_id);
1350 vdev_indirect_mapping_t *vim = vd->vdev_indirect_mapping;
1351 uint64_t start_offset = vdev_indirect_mapping_max_offset(vim);
1353 ASSERT3P(vd->vdev_ops, !=, &vdev_indirect_ops);
1354 ASSERT(vdev_is_concrete(vd));
1355 ASSERT(vd->vdev_removing);
1356 ASSERT(vd->vdev_indirect_config.vic_mapping_object != 0);
1357 ASSERT(vim != NULL);
1359 mutex_init(&vca.vca_lock, NULL, MUTEX_DEFAULT, NULL);
1360 cv_init(&vca.vca_cv, NULL, CV_DEFAULT, NULL);
1361 vca.vca_outstanding_bytes = 0;
1363 mutex_enter(&svr->svr_lock);
1366 * Start from vim_max_offset so we pick up where we left off
1367 * if we are restarting the removal after opening the pool.
1370 for (msi = start_offset >> vd->vdev_ms_shift;
1371 msi < vd->vdev_ms_count && !svr->svr_thread_exit; msi++) {
1372 metaslab_t *msp = vd->vdev_ms[msi];
1373 ASSERT3U(msi, <=, vd->vdev_ms_count);
1375 ASSERT0(range_tree_space(svr->svr_allocd_segs));
1377 mutex_enter(&msp->ms_sync_lock);
1378 mutex_enter(&msp->ms_lock);
1381 * Assert nothing in flight -- ms_*tree is empty.
1383 for (int i = 0; i < TXG_SIZE; i++) {
1384 ASSERT0(range_tree_space(msp->ms_allocating[i]));
1388 * If the metaslab has ever been allocated from (ms_sm!=NULL),
1389 * read the allocated segments from the space map object
1390 * into svr_allocd_segs. Since we do this while holding
1391 * svr_lock and ms_sync_lock, concurrent frees (which
1392 * would have modified the space map) will wait for us
1393 * to finish loading the spacemap, and then take the
1394 * appropriate action (see free_from_removing_vdev()).
1396 if (msp->ms_sm != NULL) {
1397 VERIFY0(space_map_load(msp->ms_sm,
1398 svr->svr_allocd_segs, SM_ALLOC));
1400 range_tree_walk(msp->ms_freeing,
1401 range_tree_remove, svr->svr_allocd_segs);
1404 * When we are resuming from a paused removal (i.e.
1405 * when importing a pool with a removal in progress),
1406 * discard any state that we have already processed.
1408 range_tree_clear(svr->svr_allocd_segs, 0, start_offset);
1410 mutex_exit(&msp->ms_lock);
1411 mutex_exit(&msp->ms_sync_lock);
1414 zfs_dbgmsg("copying %llu segments for metaslab %llu",
1415 avl_numnodes(&svr->svr_allocd_segs->rt_root),
1418 while (!svr->svr_thread_exit &&
1419 !range_tree_is_empty(svr->svr_allocd_segs)) {
1421 mutex_exit(&svr->svr_lock);
1424 * We need to periodically drop the config lock so that
1425 * writers can get in. Additionally, we can't wait
1426 * for a txg to sync while holding a config lock
1427 * (since a waiting writer could cause a 3-way deadlock
1428 * with the sync thread, which also gets a config
1429 * lock for reader). So we can't hold the config lock
1430 * while calling dmu_tx_assign().
1432 spa_config_exit(spa, SCL_CONFIG, FTAG);
1435 * This delay will pause the removal around the point
1436 * specified by zfs_remove_max_bytes_pause. We do this
1437 * solely from the test suite or during debugging.
1439 uint64_t bytes_copied =
1440 spa->spa_removing_phys.sr_copied;
1441 for (int i = 0; i < TXG_SIZE; i++)
1442 bytes_copied += svr->svr_bytes_done[i];
1443 while (zfs_remove_max_bytes_pause <= bytes_copied &&
1444 !svr->svr_thread_exit)
1447 mutex_enter(&vca.vca_lock);
1448 while (vca.vca_outstanding_bytes >
1449 zfs_remove_max_copy_bytes) {
1450 cv_wait(&vca.vca_cv, &vca.vca_lock);
1452 mutex_exit(&vca.vca_lock);
1455 dmu_tx_create_dd(spa_get_dsl(spa)->dp_mos_dir);
1457 VERIFY0(dmu_tx_assign(tx, TXG_WAIT));
1458 uint64_t txg = dmu_tx_get_txg(tx);
1461 * Reacquire the vdev_config lock. The vdev_t
1462 * that we're removing may have changed, e.g. due
1463 * to a vdev_attach or vdev_detach.
1465 spa_config_enter(spa, SCL_CONFIG, FTAG, RW_READER);
1466 vd = vdev_lookup_top(spa, svr->svr_vdev_id);
1468 if (txg != last_txg)
1469 max_alloc = zfs_remove_max_segment;
1472 spa_vdev_copy_impl(vd, svr, &vca, &max_alloc, tx);
1475 mutex_enter(&svr->svr_lock);
1479 mutex_exit(&svr->svr_lock);
1481 spa_config_exit(spa, SCL_CONFIG, FTAG);
1484 * Wait for all copies to finish before cleaning up the vca.
1486 txg_wait_synced(spa->spa_dsl_pool, 0);
1487 ASSERT0(vca.vca_outstanding_bytes);
1489 mutex_destroy(&vca.vca_lock);
1490 cv_destroy(&vca.vca_cv);
1492 if (svr->svr_thread_exit) {
1493 mutex_enter(&svr->svr_lock);
1494 range_tree_vacate(svr->svr_allocd_segs, NULL, NULL);
1495 svr->svr_thread = NULL;
1496 cv_broadcast(&svr->svr_cv);
1497 mutex_exit(&svr->svr_lock);
1499 ASSERT0(range_tree_space(svr->svr_allocd_segs));
1500 vdev_remove_complete(spa);
1506 spa_vdev_remove_suspend(spa_t *spa)
1508 spa_vdev_removal_t *svr = spa->spa_vdev_removal;
1513 mutex_enter(&svr->svr_lock);
1514 svr->svr_thread_exit = B_TRUE;
1515 while (svr->svr_thread != NULL)
1516 cv_wait(&svr->svr_cv, &svr->svr_lock);
1517 svr->svr_thread_exit = B_FALSE;
1518 mutex_exit(&svr->svr_lock);
1523 spa_vdev_remove_cancel_check(void *arg, dmu_tx_t *tx)
1525 spa_t *spa = dmu_tx_pool(tx)->dp_spa;
1527 if (spa->spa_vdev_removal == NULL)
1533 * Cancel a removal by freeing all entries from the partial mapping
1534 * and marking the vdev as no longer being removing.
1538 spa_vdev_remove_cancel_sync(void *arg, dmu_tx_t *tx)
1540 spa_t *spa = dmu_tx_pool(tx)->dp_spa;
1541 spa_vdev_removal_t *svr = spa->spa_vdev_removal;
1542 vdev_t *vd = vdev_lookup_top(spa, svr->svr_vdev_id);
1543 vdev_indirect_config_t *vic = &vd->vdev_indirect_config;
1544 vdev_indirect_mapping_t *vim = vd->vdev_indirect_mapping;
1545 objset_t *mos = spa->spa_meta_objset;
1547 ASSERT3P(svr->svr_thread, ==, NULL);
1549 spa_feature_decr(spa, SPA_FEATURE_DEVICE_REMOVAL, tx);
1550 if (vdev_obsolete_counts_are_precise(vd)) {
1551 spa_feature_decr(spa, SPA_FEATURE_OBSOLETE_COUNTS, tx);
1552 VERIFY0(zap_remove(spa->spa_meta_objset, vd->vdev_top_zap,
1553 VDEV_TOP_ZAP_OBSOLETE_COUNTS_ARE_PRECISE, tx));
1556 if (vdev_obsolete_sm_object(vd) != 0) {
1557 ASSERT(vd->vdev_obsolete_sm != NULL);
1558 ASSERT3U(vdev_obsolete_sm_object(vd), ==,
1559 space_map_object(vd->vdev_obsolete_sm));
1561 space_map_free(vd->vdev_obsolete_sm, tx);
1562 VERIFY0(zap_remove(spa->spa_meta_objset, vd->vdev_top_zap,
1563 VDEV_TOP_ZAP_INDIRECT_OBSOLETE_SM, tx));
1564 space_map_close(vd->vdev_obsolete_sm);
1565 vd->vdev_obsolete_sm = NULL;
1566 spa_feature_decr(spa, SPA_FEATURE_OBSOLETE_COUNTS, tx);
1568 for (int i = 0; i < TXG_SIZE; i++) {
1569 ASSERT(list_is_empty(&svr->svr_new_segments[i]));
1570 ASSERT3U(svr->svr_max_offset_to_sync[i], <=,
1571 vdev_indirect_mapping_max_offset(vim));
1574 for (uint64_t msi = 0; msi < vd->vdev_ms_count; msi++) {
1575 metaslab_t *msp = vd->vdev_ms[msi];
1577 if (msp->ms_start >= vdev_indirect_mapping_max_offset(vim))
1580 ASSERT0(range_tree_space(svr->svr_allocd_segs));
1582 mutex_enter(&msp->ms_lock);
1585 * Assert nothing in flight -- ms_*tree is empty.
1587 for (int i = 0; i < TXG_SIZE; i++)
1588 ASSERT0(range_tree_space(msp->ms_allocating[i]));
1589 for (int i = 0; i < TXG_DEFER_SIZE; i++)
1590 ASSERT0(range_tree_space(msp->ms_defer[i]));
1591 ASSERT0(range_tree_space(msp->ms_freed));
1593 if (msp->ms_sm != NULL) {
1594 mutex_enter(&svr->svr_lock);
1595 VERIFY0(space_map_load(msp->ms_sm,
1596 svr->svr_allocd_segs, SM_ALLOC));
1597 range_tree_walk(msp->ms_freeing,
1598 range_tree_remove, svr->svr_allocd_segs);
1601 * Clear everything past what has been synced,
1602 * because we have not allocated mappings for it yet.
1604 uint64_t syncd = vdev_indirect_mapping_max_offset(vim);
1605 uint64_t sm_end = msp->ms_sm->sm_start +
1606 msp->ms_sm->sm_size;
1608 range_tree_clear(svr->svr_allocd_segs,
1609 syncd, sm_end - syncd);
1611 mutex_exit(&svr->svr_lock);
1613 mutex_exit(&msp->ms_lock);
1615 mutex_enter(&svr->svr_lock);
1616 range_tree_vacate(svr->svr_allocd_segs,
1617 free_mapped_segment_cb, vd);
1618 mutex_exit(&svr->svr_lock);
1622 * Note: this must happen after we invoke free_mapped_segment_cb,
1623 * because it adds to the obsolete_segments.
1625 range_tree_vacate(vd->vdev_obsolete_segments, NULL, NULL);
1627 ASSERT3U(vic->vic_mapping_object, ==,
1628 vdev_indirect_mapping_object(vd->vdev_indirect_mapping));
1629 vdev_indirect_mapping_close(vd->vdev_indirect_mapping);
1630 vd->vdev_indirect_mapping = NULL;
1631 vdev_indirect_mapping_free(mos, vic->vic_mapping_object, tx);
1632 vic->vic_mapping_object = 0;
1634 ASSERT3U(vic->vic_births_object, ==,
1635 vdev_indirect_births_object(vd->vdev_indirect_births));
1636 vdev_indirect_births_close(vd->vdev_indirect_births);
1637 vd->vdev_indirect_births = NULL;
1638 vdev_indirect_births_free(mos, vic->vic_births_object, tx);
1639 vic->vic_births_object = 0;
1642 * We may have processed some frees from the removing vdev in this
1643 * txg, thus increasing svr_bytes_done; discard that here to
1644 * satisfy the assertions in spa_vdev_removal_destroy().
1645 * Note that future txg's can not have any bytes_done, because
1646 * future TXG's are only modified from open context, and we have
1647 * already shut down the copying thread.
1649 svr->svr_bytes_done[dmu_tx_get_txg(tx) & TXG_MASK] = 0;
1650 spa_finish_removal(spa, DSS_CANCELED, tx);
1652 vd->vdev_removing = B_FALSE;
1653 vdev_config_dirty(vd);
1655 zfs_dbgmsg("canceled device removal for vdev %llu in %llu",
1656 vd->vdev_id, dmu_tx_get_txg(tx));
1657 spa_history_log_internal(spa, "vdev remove canceled", tx,
1658 "%s vdev %llu %s", spa_name(spa),
1659 vd->vdev_id, (vd->vdev_path != NULL) ? vd->vdev_path : "-");
1663 spa_vdev_remove_cancel(spa_t *spa)
1665 spa_vdev_remove_suspend(spa);
1667 if (spa->spa_vdev_removal == NULL)
1670 uint64_t vdid = spa->spa_vdev_removal->svr_vdev_id;
1672 int error = dsl_sync_task(spa->spa_name, spa_vdev_remove_cancel_check,
1673 spa_vdev_remove_cancel_sync, NULL, 0,
1674 ZFS_SPACE_CHECK_EXTRA_RESERVED);
1677 spa_config_enter(spa, SCL_ALLOC | SCL_VDEV, FTAG, RW_WRITER);
1678 vdev_t *vd = vdev_lookup_top(spa, vdid);
1679 metaslab_group_activate(vd->vdev_mg);
1680 spa_config_exit(spa, SCL_ALLOC | SCL_VDEV, FTAG);
1687 svr_sync(spa_t *spa, dmu_tx_t *tx)
1689 spa_vdev_removal_t *svr = spa->spa_vdev_removal;
1690 int txgoff = dmu_tx_get_txg(tx) & TXG_MASK;
1693 * This check is necessary so that we do not dirty the
1694 * DIRECTORY_OBJECT via spa_sync_removing_state() when there
1695 * is nothing to do. Dirtying it every time would prevent us
1696 * from syncing-to-convergence.
1698 if (svr->svr_bytes_done[txgoff] == 0)
1702 * Update progress accounting.
1704 spa->spa_removing_phys.sr_copied += svr->svr_bytes_done[txgoff];
1705 svr->svr_bytes_done[txgoff] = 0;
1707 spa_sync_removing_state(spa, tx);
1711 vdev_remove_make_hole_and_free(vdev_t *vd)
1713 uint64_t id = vd->vdev_id;
1714 spa_t *spa = vd->vdev_spa;
1715 vdev_t *rvd = spa->spa_root_vdev;
1716 boolean_t last_vdev = (id == (rvd->vdev_children - 1));
1718 ASSERT(MUTEX_HELD(&spa_namespace_lock));
1719 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL);
1724 vdev_compact_children(rvd);
1726 vd = vdev_alloc_common(spa, id, 0, &vdev_hole_ops);
1727 vdev_add_child(rvd, vd);
1729 vdev_config_dirty(rvd);
1732 * Reassess the health of our root vdev.
1738 * Remove a log device. The config lock is held for the specified TXG.
1741 spa_vdev_remove_log(vdev_t *vd, uint64_t *txg)
1743 metaslab_group_t *mg = vd->vdev_mg;
1744 spa_t *spa = vd->vdev_spa;
1747 ASSERT(vd->vdev_islog);
1748 ASSERT(vd == vd->vdev_top);
1749 ASSERT(MUTEX_HELD(&spa_namespace_lock));
1752 * Stop allocating from this vdev.
1754 metaslab_group_passivate(mg);
1757 * Wait for the youngest allocations and frees to sync,
1758 * and then wait for the deferral of those frees to finish.
1760 spa_vdev_config_exit(spa, NULL,
1761 *txg + TXG_CONCURRENT_STATES + TXG_DEFER_SIZE, 0, FTAG);
1764 * Evacuate the device. We don't hold the config lock as
1765 * writer since we need to do I/O but we do keep the
1766 * spa_namespace_lock held. Once this completes the device
1767 * should no longer have any blocks allocated on it.
1769 ASSERT(MUTEX_HELD(&spa_namespace_lock));
1770 if (vd->vdev_stat.vs_alloc != 0)
1771 error = spa_reset_logs(spa);
1773 *txg = spa_vdev_config_enter(spa);
1776 metaslab_group_activate(mg);
1779 ASSERT0(vd->vdev_stat.vs_alloc);
1782 * The evacuation succeeded. Remove any remaining MOS metadata
1783 * associated with this vdev, and wait for these changes to sync.
1785 vd->vdev_removing = B_TRUE;
1787 vdev_dirty_leaves(vd, VDD_DTL, *txg);
1788 vdev_config_dirty(vd);
1790 vdev_metaslab_fini(vd);
1792 spa_history_log_internal(spa, "vdev remove", NULL,
1793 "%s vdev %llu (log) %s", spa_name(spa), vd->vdev_id,
1794 (vd->vdev_path != NULL) ? vd->vdev_path : "-");
1796 /* Make sure these changes are sync'ed */
1797 spa_vdev_config_exit(spa, NULL, *txg, 0, FTAG);
1799 /* Stop initializing */
1800 (void) vdev_initialize_stop_all(vd, VDEV_INITIALIZE_CANCELED);
1802 *txg = spa_vdev_config_enter(spa);
1804 sysevent_t *ev = spa_event_create(spa, vd, NULL,
1805 ESC_ZFS_VDEV_REMOVE_DEV);
1806 ASSERT(MUTEX_HELD(&spa_namespace_lock));
1807 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL);
1809 /* The top ZAP should have been destroyed by vdev_remove_empty. */
1810 ASSERT0(vd->vdev_top_zap);
1811 /* The leaf ZAP should have been destroyed by vdev_dtl_sync. */
1812 ASSERT0(vd->vdev_leaf_zap);
1814 (void) vdev_label_init(vd, 0, VDEV_LABEL_REMOVE);
1816 if (list_link_active(&vd->vdev_state_dirty_node))
1817 vdev_state_clean(vd);
1818 if (list_link_active(&vd->vdev_config_dirty_node))
1819 vdev_config_clean(vd);
1821 ASSERT0(vd->vdev_stat.vs_alloc);
1824 * Clean up the vdev namespace.
1826 vdev_remove_make_hole_and_free(vd);
1835 spa_vdev_remove_top_check(vdev_t *vd)
1837 spa_t *spa = vd->vdev_spa;
1839 if (vd != vd->vdev_top)
1840 return (SET_ERROR(ENOTSUP));
1842 if (!spa_feature_is_enabled(spa, SPA_FEATURE_DEVICE_REMOVAL))
1843 return (SET_ERROR(ENOTSUP));
1845 /* available space in the pool's normal class */
1846 uint64_t available = dsl_dir_space_available(
1847 spa->spa_dsl_pool->dp_root_dir, NULL, 0, B_TRUE);
1849 metaslab_class_t *mc = vd->vdev_mg->mg_class;
1852 * When removing a vdev from an allocation class that has
1853 * remaining vdevs, include available space from the class.
1855 if (mc != spa_normal_class(spa) && mc->mc_groups > 1) {
1856 uint64_t class_avail = metaslab_class_get_space(mc) -
1857 metaslab_class_get_alloc(mc);
1859 /* add class space, adjusted for overhead */
1860 available += (class_avail * 94) / 100;
1864 * There has to be enough free space to remove the
1865 * device and leave double the "slop" space (i.e. we
1866 * must leave at least 3% of the pool free, in addition to
1867 * the normal slop space).
1869 if (available < vd->vdev_stat.vs_dspace + spa_get_slop_space(spa)) {
1870 return (SET_ERROR(ENOSPC));
1874 * There can not be a removal in progress.
1876 if (spa->spa_removing_phys.sr_state == DSS_SCANNING)
1877 return (SET_ERROR(EBUSY));
1880 * The device must have all its data.
1882 if (!vdev_dtl_empty(vd, DTL_MISSING) ||
1883 !vdev_dtl_empty(vd, DTL_OUTAGE))
1884 return (SET_ERROR(EBUSY));
1887 * The device must be healthy.
1889 if (!vdev_readable(vd))
1890 return (SET_ERROR(EIO));
1893 * All vdevs in normal class must have the same ashift.
1895 if (spa->spa_max_ashift != spa->spa_min_ashift) {
1896 return (SET_ERROR(EINVAL));
1900 * All vdevs in normal class must have the same ashift
1903 vdev_t *rvd = spa->spa_root_vdev;
1904 int num_indirect = 0;
1905 for (uint64_t id = 0; id < rvd->vdev_children; id++) {
1906 vdev_t *cvd = rvd->vdev_child[id];
1907 if (cvd->vdev_ashift != 0 && !cvd->vdev_islog)
1908 ASSERT3U(cvd->vdev_ashift, ==, spa->spa_max_ashift);
1909 if (cvd->vdev_ops == &vdev_indirect_ops)
1911 if (!vdev_is_concrete(cvd))
1913 if (cvd->vdev_ops == &vdev_raidz_ops)
1914 return (SET_ERROR(EINVAL));
1916 * Need the mirror to be mirror of leaf vdevs only
1918 if (cvd->vdev_ops == &vdev_mirror_ops) {
1919 for (uint64_t cid = 0;
1920 cid < cvd->vdev_children; cid++) {
1921 vdev_t *tmp = cvd->vdev_child[cid];
1922 if (!tmp->vdev_ops->vdev_op_leaf)
1923 return (SET_ERROR(EINVAL));
1932 * Initiate removal of a top-level vdev, reducing the total space in the pool.
1933 * The config lock is held for the specified TXG. Once initiated,
1934 * evacuation of all allocated space (copying it to other vdevs) happens
1935 * in the background (see spa_vdev_remove_thread()), and can be canceled
1936 * (see spa_vdev_remove_cancel()). If successful, the vdev will
1937 * be transformed to an indirect vdev (see spa_vdev_remove_complete()).
1940 spa_vdev_remove_top(vdev_t *vd, uint64_t *txg)
1942 spa_t *spa = vd->vdev_spa;
1946 * Check for errors up-front, so that we don't waste time
1947 * passivating the metaslab group and clearing the ZIL if there
1950 error = spa_vdev_remove_top_check(vd);
1955 * Stop allocating from this vdev. Note that we must check
1956 * that this is not the only device in the pool before
1957 * passivating, otherwise we will not be able to make
1958 * progress because we can't allocate from any vdevs.
1959 * The above check for sufficient free space serves this
1962 metaslab_group_t *mg = vd->vdev_mg;
1963 metaslab_group_passivate(mg);
1966 * Wait for the youngest allocations and frees to sync,
1967 * and then wait for the deferral of those frees to finish.
1969 spa_vdev_config_exit(spa, NULL,
1970 *txg + TXG_CONCURRENT_STATES + TXG_DEFER_SIZE, 0, FTAG);
1973 * We must ensure that no "stubby" log blocks are allocated
1974 * on the device to be removed. These blocks could be
1975 * written at any time, including while we are in the middle
1978 error = spa_reset_logs(spa);
1981 * We stop any initializing that is currently in progress but leave
1982 * the state as "active". This will allow the initializing to resume
1983 * if the removal is canceled sometime later.
1985 vdev_initialize_stop_all(vd, VDEV_INITIALIZE_ACTIVE);
1987 *txg = spa_vdev_config_enter(spa);
1990 * Things might have changed while the config lock was dropped
1991 * (e.g. space usage). Check for errors again.
1994 error = spa_vdev_remove_top_check(vd);
1997 metaslab_group_activate(mg);
1998 spa_async_request(spa, SPA_ASYNC_INITIALIZE_RESTART);
2002 vd->vdev_removing = B_TRUE;
2004 vdev_dirty_leaves(vd, VDD_DTL, *txg);
2005 vdev_config_dirty(vd);
2006 dmu_tx_t *tx = dmu_tx_create_assigned(spa->spa_dsl_pool, *txg);
2007 dsl_sync_task_nowait(spa->spa_dsl_pool,
2008 vdev_remove_initiate_sync,
2009 (void *)(uintptr_t)vd->vdev_id, 0, ZFS_SPACE_CHECK_NONE, tx);
2016 * Remove a device from the pool.
2018 * Removing a device from the vdev namespace requires several steps
2019 * and can take a significant amount of time. As a result we use
2020 * the spa_vdev_config_[enter/exit] functions which allow us to
2021 * grab and release the spa_config_lock while still holding the namespace
2022 * lock. During each step the configuration is synced out.
2025 spa_vdev_remove(spa_t *spa, uint64_t guid, boolean_t unspare)
2028 nvlist_t **spares, **l2cache, *nv;
2030 uint_t nspares, nl2cache;
2032 boolean_t locked = MUTEX_HELD(&spa_namespace_lock);
2033 sysevent_t *ev = NULL;
2035 ASSERT(spa_writeable(spa));
2038 txg = spa_vdev_enter(spa);
2040 ASSERT(MUTEX_HELD(&spa_namespace_lock));
2041 if (spa_feature_is_active(spa, SPA_FEATURE_POOL_CHECKPOINT)) {
2042 error = (spa_has_checkpoint(spa)) ?
2043 ZFS_ERR_CHECKPOINT_EXISTS : ZFS_ERR_DISCARDING_CHECKPOINT;
2046 return (spa_vdev_exit(spa, NULL, txg, error));
2051 vd = spa_lookup_by_guid(spa, guid, B_FALSE);
2053 if (spa->spa_spares.sav_vdevs != NULL &&
2054 nvlist_lookup_nvlist_array(spa->spa_spares.sav_config,
2055 ZPOOL_CONFIG_SPARES, &spares, &nspares) == 0 &&
2056 (nv = spa_nvlist_lookup_by_guid(spares, nspares, guid)) != NULL) {
2058 * Only remove the hot spare if it's not currently in use
2061 if (vd == NULL || unspare) {
2062 char *nvstr = fnvlist_lookup_string(nv,
2064 spa_history_log_internal(spa, "vdev remove", NULL,
2065 "%s vdev (%s) %s", spa_name(spa),
2066 VDEV_TYPE_SPARE, nvstr);
2068 vd = spa_lookup_by_guid(spa, guid, B_TRUE);
2069 ev = spa_event_create(spa, vd, NULL,
2070 ESC_ZFS_VDEV_REMOVE_AUX);
2071 spa_vdev_remove_aux(spa->spa_spares.sav_config,
2072 ZPOOL_CONFIG_SPARES, spares, nspares, nv);
2073 spa_load_spares(spa);
2074 spa->spa_spares.sav_sync = B_TRUE;
2076 error = SET_ERROR(EBUSY);
2078 } else if (spa->spa_l2cache.sav_vdevs != NULL &&
2079 nvlist_lookup_nvlist_array(spa->spa_l2cache.sav_config,
2080 ZPOOL_CONFIG_L2CACHE, &l2cache, &nl2cache) == 0 &&
2081 (nv = spa_nvlist_lookup_by_guid(l2cache, nl2cache, guid)) != NULL) {
2082 char *nvstr = fnvlist_lookup_string(nv, ZPOOL_CONFIG_PATH);
2083 spa_history_log_internal(spa, "vdev remove", NULL,
2084 "%s vdev (%s) %s", spa_name(spa), VDEV_TYPE_L2CACHE, nvstr);
2086 * Cache devices can always be removed.
2088 vd = spa_lookup_by_guid(spa, guid, B_TRUE);
2089 ev = spa_event_create(spa, vd, NULL, ESC_ZFS_VDEV_REMOVE_AUX);
2090 spa_vdev_remove_aux(spa->spa_l2cache.sav_config,
2091 ZPOOL_CONFIG_L2CACHE, l2cache, nl2cache, nv);
2092 spa_load_l2cache(spa);
2093 spa->spa_l2cache.sav_sync = B_TRUE;
2094 } else if (vd != NULL && vd->vdev_islog) {
2096 error = spa_vdev_remove_log(vd, &txg);
2097 } else if (vd != NULL) {
2099 error = spa_vdev_remove_top(vd, &txg);
2102 * There is no vdev of any kind with the specified guid.
2104 error = SET_ERROR(ENOENT);
2108 error = spa_vdev_exit(spa, NULL, txg, error);
2112 spa_event_discard(ev);
2122 spa_removal_get_stats(spa_t *spa, pool_removal_stat_t *prs)
2124 prs->prs_state = spa->spa_removing_phys.sr_state;
2126 if (prs->prs_state == DSS_NONE)
2127 return (SET_ERROR(ENOENT));
2129 prs->prs_removing_vdev = spa->spa_removing_phys.sr_removing_vdev;
2130 prs->prs_start_time = spa->spa_removing_phys.sr_start_time;
2131 prs->prs_end_time = spa->spa_removing_phys.sr_end_time;
2132 prs->prs_to_copy = spa->spa_removing_phys.sr_to_copy;
2133 prs->prs_copied = spa->spa_removing_phys.sr_copied;
2135 if (spa->spa_vdev_removal != NULL) {
2136 for (int i = 0; i < TXG_SIZE; i++) {
2138 spa->spa_vdev_removal->svr_bytes_done[i];
2142 prs->prs_mapping_memory = 0;
2143 uint64_t indirect_vdev_id =
2144 spa->spa_removing_phys.sr_prev_indirect_vdev;
2145 while (indirect_vdev_id != -1) {
2146 vdev_t *vd = spa->spa_root_vdev->vdev_child[indirect_vdev_id];
2147 vdev_indirect_config_t *vic = &vd->vdev_indirect_config;
2148 vdev_indirect_mapping_t *vim = vd->vdev_indirect_mapping;
2150 ASSERT3P(vd->vdev_ops, ==, &vdev_indirect_ops);
2151 prs->prs_mapping_memory += vdev_indirect_mapping_size(vim);
2152 indirect_vdev_id = vic->vic_prev_indirect_vdev;