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.
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.
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]
23 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Copyright (c) 2011, 2017 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/trace_vdev.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 or mirrors. (Note that members of a mirror can 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 int zfs_remove_max_segment
= SPA_MAXBLOCKSIZE
;
103 * Allow a remap segment to span free chunks of at most this size. The main
104 * impact of a larger span is that we will read and write larger, more
105 * contiguous chunks, with more "unnecessary" data -- trading off bandwidth
106 * for iops. The value here was chosen to align with
107 * zfs_vdev_read_gap_limit, which is a similar concept when doing regular
108 * reads (but there's no reason it has to be the same).
110 * Additionally, a higher span will have the following relatively minor
112 * - the mapping will be smaller, since one entry can cover more allocated
114 * - more of the fragmentation in the removing device will be preserved
115 * - we'll do larger allocations, which may fail and fall back on smaller
118 int vdev_removal_max_span
= 32 * 1024;
121 * This is used by the test suite so that it can ensure that certain
122 * actions happen while in the middle of a removal.
124 unsigned long zfs_remove_max_bytes_pause
= -1UL;
126 #define VDEV_REMOVAL_ZAP_OBJS "lzap"
128 static void spa_vdev_remove_thread(void *arg
);
131 spa_sync_removing_state(spa_t
*spa
, dmu_tx_t
*tx
)
133 VERIFY0(zap_update(spa
->spa_dsl_pool
->dp_meta_objset
,
134 DMU_POOL_DIRECTORY_OBJECT
,
135 DMU_POOL_REMOVING
, sizeof (uint64_t),
136 sizeof (spa
->spa_removing_phys
) / sizeof (uint64_t),
137 &spa
->spa_removing_phys
, tx
));
141 spa_nvlist_lookup_by_guid(nvlist_t
**nvpp
, int count
, uint64_t target_guid
)
143 for (int i
= 0; i
< count
; i
++) {
145 fnvlist_lookup_uint64(nvpp
[i
], ZPOOL_CONFIG_GUID
);
147 if (guid
== target_guid
)
155 spa_vdev_remove_aux(nvlist_t
*config
, char *name
, nvlist_t
**dev
, int count
,
156 nvlist_t
*dev_to_remove
)
158 nvlist_t
**newdev
= NULL
;
161 newdev
= kmem_alloc((count
- 1) * sizeof (void *), KM_SLEEP
);
163 for (int i
= 0, j
= 0; i
< count
; i
++) {
164 if (dev
[i
] == dev_to_remove
)
166 VERIFY(nvlist_dup(dev
[i
], &newdev
[j
++], KM_SLEEP
) == 0);
169 VERIFY(nvlist_remove(config
, name
, DATA_TYPE_NVLIST_ARRAY
) == 0);
170 VERIFY(nvlist_add_nvlist_array(config
, name
, newdev
, count
- 1) == 0);
172 for (int i
= 0; i
< count
- 1; i
++)
173 nvlist_free(newdev
[i
]);
176 kmem_free(newdev
, (count
- 1) * sizeof (void *));
179 static spa_vdev_removal_t
*
180 spa_vdev_removal_create(vdev_t
*vd
)
182 spa_vdev_removal_t
*svr
= kmem_zalloc(sizeof (*svr
), KM_SLEEP
);
183 mutex_init(&svr
->svr_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
184 cv_init(&svr
->svr_cv
, NULL
, CV_DEFAULT
, NULL
);
185 svr
->svr_allocd_segs
= range_tree_create(NULL
, NULL
);
186 svr
->svr_vdev_id
= vd
->vdev_id
;
188 for (int i
= 0; i
< TXG_SIZE
; i
++) {
189 svr
->svr_frees
[i
] = range_tree_create(NULL
, NULL
);
190 list_create(&svr
->svr_new_segments
[i
],
191 sizeof (vdev_indirect_mapping_entry_t
),
192 offsetof(vdev_indirect_mapping_entry_t
, vime_node
));
199 spa_vdev_removal_destroy(spa_vdev_removal_t
*svr
)
201 for (int i
= 0; i
< TXG_SIZE
; i
++) {
202 ASSERT0(svr
->svr_bytes_done
[i
]);
203 ASSERT0(svr
->svr_max_offset_to_sync
[i
]);
204 range_tree_destroy(svr
->svr_frees
[i
]);
205 list_destroy(&svr
->svr_new_segments
[i
]);
208 range_tree_destroy(svr
->svr_allocd_segs
);
209 mutex_destroy(&svr
->svr_lock
);
210 cv_destroy(&svr
->svr_cv
);
211 kmem_free(svr
, sizeof (*svr
));
215 * This is called as a synctask in the txg in which we will mark this vdev
216 * as removing (in the config stored in the MOS).
218 * It begins the evacuation of a toplevel vdev by:
219 * - initializing the spa_removing_phys which tracks this removal
220 * - computing the amount of space to remove for accounting purposes
221 * - dirtying all dbufs in the spa_config_object
222 * - creating the spa_vdev_removal
223 * - starting the spa_vdev_remove_thread
226 vdev_remove_initiate_sync(void *arg
, dmu_tx_t
*tx
)
228 int vdev_id
= (uintptr_t)arg
;
229 spa_t
*spa
= dmu_tx_pool(tx
)->dp_spa
;
230 vdev_t
*vd
= vdev_lookup_top(spa
, vdev_id
);
231 vdev_indirect_config_t
*vic
= &vd
->vdev_indirect_config
;
232 objset_t
*mos
= spa
->spa_dsl_pool
->dp_meta_objset
;
233 spa_vdev_removal_t
*svr
= NULL
;
234 ASSERTV(uint64_t txg
= dmu_tx_get_txg(tx
));
236 ASSERT3P(vd
->vdev_ops
, !=, &vdev_raidz_ops
);
237 svr
= spa_vdev_removal_create(vd
);
239 ASSERT(vd
->vdev_removing
);
240 ASSERT3P(vd
->vdev_indirect_mapping
, ==, NULL
);
242 spa_feature_incr(spa
, SPA_FEATURE_DEVICE_REMOVAL
, tx
);
243 if (spa_feature_is_enabled(spa
, SPA_FEATURE_OBSOLETE_COUNTS
)) {
245 * By activating the OBSOLETE_COUNTS feature, we prevent
246 * the pool from being downgraded and ensure that the
247 * refcounts are precise.
249 spa_feature_incr(spa
, SPA_FEATURE_OBSOLETE_COUNTS
, tx
);
251 VERIFY0(zap_add(spa
->spa_meta_objset
, vd
->vdev_top_zap
,
252 VDEV_TOP_ZAP_OBSOLETE_COUNTS_ARE_PRECISE
, sizeof (one
), 1,
254 ASSERT3U(vdev_obsolete_counts_are_precise(vd
), !=, 0);
257 vic
->vic_mapping_object
= vdev_indirect_mapping_alloc(mos
, tx
);
258 vd
->vdev_indirect_mapping
=
259 vdev_indirect_mapping_open(mos
, vic
->vic_mapping_object
);
260 vic
->vic_births_object
= vdev_indirect_births_alloc(mos
, tx
);
261 vd
->vdev_indirect_births
=
262 vdev_indirect_births_open(mos
, vic
->vic_births_object
);
263 spa
->spa_removing_phys
.sr_removing_vdev
= vd
->vdev_id
;
264 spa
->spa_removing_phys
.sr_start_time
= gethrestime_sec();
265 spa
->spa_removing_phys
.sr_end_time
= 0;
266 spa
->spa_removing_phys
.sr_state
= DSS_SCANNING
;
267 spa
->spa_removing_phys
.sr_to_copy
= 0;
268 spa
->spa_removing_phys
.sr_copied
= 0;
271 * Note: We can't use vdev_stat's vs_alloc for sr_to_copy, because
272 * there may be space in the defer tree, which is free, but still
273 * counted in vs_alloc.
275 for (uint64_t i
= 0; i
< vd
->vdev_ms_count
; i
++) {
276 metaslab_t
*ms
= vd
->vdev_ms
[i
];
277 if (ms
->ms_sm
== NULL
)
281 * Sync tasks happen before metaslab_sync(), therefore
282 * smp_alloc and sm_alloc must be the same.
284 ASSERT3U(space_map_allocated(ms
->ms_sm
), ==,
285 ms
->ms_sm
->sm_phys
->smp_alloc
);
287 spa
->spa_removing_phys
.sr_to_copy
+=
288 space_map_allocated(ms
->ms_sm
);
291 * Space which we are freeing this txg does not need to
294 spa
->spa_removing_phys
.sr_to_copy
-=
295 range_tree_space(ms
->ms_freeing
);
297 ASSERT0(range_tree_space(ms
->ms_freed
));
298 for (int t
= 0; t
< TXG_SIZE
; t
++)
299 ASSERT0(range_tree_space(ms
->ms_allocating
[t
]));
303 * Sync tasks are called before metaslab_sync(), so there should
304 * be no already-synced metaslabs in the TXG_CLEAN list.
306 ASSERT3P(txg_list_head(&vd
->vdev_ms_list
, TXG_CLEAN(txg
)), ==, NULL
);
308 spa_sync_removing_state(spa
, tx
);
311 * All blocks that we need to read the most recent mapping must be
312 * stored on concrete vdevs. Therefore, we must dirty anything that
313 * is read before spa_remove_init(). Specifically, the
314 * spa_config_object. (Note that although we already modified the
315 * spa_config_object in spa_sync_removing_state, that may not have
316 * modified all blocks of the object.)
318 dmu_object_info_t doi
;
319 VERIFY0(dmu_object_info(mos
, DMU_POOL_DIRECTORY_OBJECT
, &doi
));
320 for (uint64_t offset
= 0; offset
< doi
.doi_max_offset
; ) {
322 VERIFY0(dmu_buf_hold(mos
, DMU_POOL_DIRECTORY_OBJECT
,
323 offset
, FTAG
, &dbuf
, 0));
324 dmu_buf_will_dirty(dbuf
, tx
);
325 offset
+= dbuf
->db_size
;
326 dmu_buf_rele(dbuf
, FTAG
);
330 * Now that we've allocated the im_object, dirty the vdev to ensure
331 * that the object gets written to the config on disk.
333 vdev_config_dirty(vd
);
335 zfs_dbgmsg("starting removal thread for vdev %llu (%p) in txg %llu "
336 "im_obj=%llu", vd
->vdev_id
, vd
, dmu_tx_get_txg(tx
),
337 vic
->vic_mapping_object
);
339 spa_history_log_internal(spa
, "vdev remove started", tx
,
340 "%s vdev %llu %s", spa_name(spa
), vd
->vdev_id
,
341 (vd
->vdev_path
!= NULL
) ? vd
->vdev_path
: "-");
343 * Setting spa_vdev_removal causes subsequent frees to call
344 * free_from_removing_vdev(). Note that we don't need any locking
345 * because we are the sync thread, and metaslab_free_impl() is only
346 * called from syncing context (potentially from a zio taskq thread,
347 * but in any case only when there are outstanding free i/os, which
350 ASSERT3P(spa
->spa_vdev_removal
, ==, NULL
);
351 spa
->spa_vdev_removal
= svr
;
352 svr
->svr_thread
= thread_create(NULL
, 0,
353 spa_vdev_remove_thread
, spa
, 0, &p0
, TS_RUN
, minclsyspri
);
357 * When we are opening a pool, we must read the mapping for each
358 * indirect vdev in order from most recently removed to least
359 * recently removed. We do this because the blocks for the mapping
360 * of older indirect vdevs may be stored on more recently removed vdevs.
361 * In order to read each indirect mapping object, we must have
362 * initialized all more recently removed vdevs.
365 spa_remove_init(spa_t
*spa
)
369 error
= zap_lookup(spa
->spa_dsl_pool
->dp_meta_objset
,
370 DMU_POOL_DIRECTORY_OBJECT
,
371 DMU_POOL_REMOVING
, sizeof (uint64_t),
372 sizeof (spa
->spa_removing_phys
) / sizeof (uint64_t),
373 &spa
->spa_removing_phys
);
375 if (error
== ENOENT
) {
376 spa
->spa_removing_phys
.sr_state
= DSS_NONE
;
377 spa
->spa_removing_phys
.sr_removing_vdev
= -1;
378 spa
->spa_removing_phys
.sr_prev_indirect_vdev
= -1;
379 spa
->spa_indirect_vdevs_loaded
= B_TRUE
;
381 } else if (error
!= 0) {
385 if (spa
->spa_removing_phys
.sr_state
== DSS_SCANNING
) {
387 * We are currently removing a vdev. Create and
388 * initialize a spa_vdev_removal_t from the bonus
389 * buffer of the removing vdevs vdev_im_object, and
390 * initialize its partial mapping.
392 spa_config_enter(spa
, SCL_STATE
, FTAG
, RW_READER
);
393 vdev_t
*vd
= vdev_lookup_top(spa
,
394 spa
->spa_removing_phys
.sr_removing_vdev
);
397 spa_config_exit(spa
, SCL_STATE
, FTAG
);
401 vdev_indirect_config_t
*vic
= &vd
->vdev_indirect_config
;
403 ASSERT(vdev_is_concrete(vd
));
404 spa_vdev_removal_t
*svr
= spa_vdev_removal_create(vd
);
405 ASSERT3U(svr
->svr_vdev_id
, ==, vd
->vdev_id
);
406 ASSERT(vd
->vdev_removing
);
408 vd
->vdev_indirect_mapping
= vdev_indirect_mapping_open(
409 spa
->spa_meta_objset
, vic
->vic_mapping_object
);
410 vd
->vdev_indirect_births
= vdev_indirect_births_open(
411 spa
->spa_meta_objset
, vic
->vic_births_object
);
412 spa_config_exit(spa
, SCL_STATE
, FTAG
);
414 spa
->spa_vdev_removal
= svr
;
417 spa_config_enter(spa
, SCL_STATE
, FTAG
, RW_READER
);
418 uint64_t indirect_vdev_id
=
419 spa
->spa_removing_phys
.sr_prev_indirect_vdev
;
420 while (indirect_vdev_id
!= UINT64_MAX
) {
421 vdev_t
*vd
= vdev_lookup_top(spa
, indirect_vdev_id
);
422 vdev_indirect_config_t
*vic
= &vd
->vdev_indirect_config
;
424 ASSERT3P(vd
->vdev_ops
, ==, &vdev_indirect_ops
);
425 vd
->vdev_indirect_mapping
= vdev_indirect_mapping_open(
426 spa
->spa_meta_objset
, vic
->vic_mapping_object
);
427 vd
->vdev_indirect_births
= vdev_indirect_births_open(
428 spa
->spa_meta_objset
, vic
->vic_births_object
);
430 indirect_vdev_id
= vic
->vic_prev_indirect_vdev
;
432 spa_config_exit(spa
, SCL_STATE
, FTAG
);
435 * Now that we've loaded all the indirect mappings, we can allow
436 * reads from other blocks (e.g. via predictive prefetch).
438 spa
->spa_indirect_vdevs_loaded
= B_TRUE
;
443 spa_restart_removal(spa_t
*spa
)
445 spa_vdev_removal_t
*svr
= spa
->spa_vdev_removal
;
451 * In general when this function is called there is no
452 * removal thread running. The only scenario where this
453 * is not true is during spa_import() where this function
454 * is called twice [once from spa_import_impl() and
455 * spa_async_resume()]. Thus, in the scenario where we
456 * import a pool that has an ongoing removal we don't
457 * want to spawn a second thread.
459 if (svr
->svr_thread
!= NULL
)
462 if (!spa_writeable(spa
))
465 zfs_dbgmsg("restarting removal of %llu", svr
->svr_vdev_id
);
466 svr
->svr_thread
= thread_create(NULL
, 0, spa_vdev_remove_thread
, spa
,
467 0, &p0
, TS_RUN
, minclsyspri
);
471 * Process freeing from a device which is in the middle of being removed.
472 * We must handle this carefully so that we attempt to copy freed data,
473 * and we correctly free already-copied data.
476 free_from_removing_vdev(vdev_t
*vd
, uint64_t offset
, uint64_t size
)
478 spa_t
*spa
= vd
->vdev_spa
;
479 spa_vdev_removal_t
*svr
= spa
->spa_vdev_removal
;
480 vdev_indirect_mapping_t
*vim
= vd
->vdev_indirect_mapping
;
481 uint64_t txg
= spa_syncing_txg(spa
);
482 uint64_t max_offset_yet
= 0;
484 ASSERT(vd
->vdev_indirect_config
.vic_mapping_object
!= 0);
485 ASSERT3U(vd
->vdev_indirect_config
.vic_mapping_object
, ==,
486 vdev_indirect_mapping_object(vim
));
487 ASSERT3U(vd
->vdev_id
, ==, svr
->svr_vdev_id
);
489 mutex_enter(&svr
->svr_lock
);
492 * Remove the segment from the removing vdev's spacemap. This
493 * ensures that we will not attempt to copy this space (if the
494 * removal thread has not yet visited it), and also ensures
495 * that we know what is actually allocated on the new vdevs
496 * (needed if we cancel the removal).
498 * Note: we must do the metaslab_free_concrete() with the svr_lock
499 * held, so that the remove_thread can not load this metaslab and then
500 * visit this offset between the time that we metaslab_free_concrete()
501 * and when we check to see if it has been visited.
503 * Note: The checkpoint flag is set to false as having/taking
504 * a checkpoint and removing a device can't happen at the same
507 ASSERT(!spa_has_checkpoint(spa
));
508 metaslab_free_concrete(vd
, offset
, size
, B_FALSE
);
510 uint64_t synced_size
= 0;
511 uint64_t synced_offset
= 0;
512 uint64_t max_offset_synced
= vdev_indirect_mapping_max_offset(vim
);
513 if (offset
< max_offset_synced
) {
515 * The mapping for this offset is already on disk.
516 * Free from the new location.
518 * Note that we use svr_max_synced_offset because it is
519 * updated atomically with respect to the in-core mapping.
520 * By contrast, vim_max_offset is not.
522 * This block may be split between a synced entry and an
523 * in-flight or unvisited entry. Only process the synced
524 * portion of it here.
526 synced_size
= MIN(size
, max_offset_synced
- offset
);
527 synced_offset
= offset
;
529 ASSERT3U(max_offset_yet
, <=, max_offset_synced
);
530 max_offset_yet
= max_offset_synced
;
532 DTRACE_PROBE3(remove__free__synced
,
535 uint64_t, synced_size
);
538 offset
+= synced_size
;
542 * Look at all in-flight txgs starting from the currently syncing one
543 * and see if a section of this free is being copied. By starting from
544 * this txg and iterating forward, we might find that this region
545 * was copied in two different txgs and handle it appropriately.
547 for (int i
= 0; i
< TXG_CONCURRENT_STATES
; i
++) {
548 int txgoff
= (txg
+ i
) & TXG_MASK
;
549 if (size
> 0 && offset
< svr
->svr_max_offset_to_sync
[txgoff
]) {
551 * The mapping for this offset is in flight, and
552 * will be synced in txg+i.
554 uint64_t inflight_size
= MIN(size
,
555 svr
->svr_max_offset_to_sync
[txgoff
] - offset
);
557 DTRACE_PROBE4(remove__free__inflight
,
560 uint64_t, inflight_size
,
564 * We copy data in order of increasing offset.
565 * Therefore the max_offset_to_sync[] must increase
566 * (or be zero, indicating that nothing is being
567 * copied in that txg).
569 if (svr
->svr_max_offset_to_sync
[txgoff
] != 0) {
570 ASSERT3U(svr
->svr_max_offset_to_sync
[txgoff
],
573 svr
->svr_max_offset_to_sync
[txgoff
];
577 * We've already committed to copying this segment:
578 * we have allocated space elsewhere in the pool for
579 * it and have an IO outstanding to copy the data. We
580 * cannot free the space before the copy has
581 * completed, or else the copy IO might overwrite any
582 * new data. To free that space, we record the
583 * segment in the appropriate svr_frees tree and free
584 * the mapped space later, in the txg where we have
585 * completed the copy and synced the mapping (see
586 * vdev_mapping_sync).
588 range_tree_add(svr
->svr_frees
[txgoff
],
589 offset
, inflight_size
);
590 size
-= inflight_size
;
591 offset
+= inflight_size
;
594 * This space is already accounted for as being
595 * done, because it is being copied in txg+i.
596 * However, if i!=0, then it is being copied in
597 * a future txg. If we crash after this txg
598 * syncs but before txg+i syncs, then the space
599 * will be free. Therefore we must account
600 * for the space being done in *this* txg
601 * (when it is freed) rather than the future txg
602 * (when it will be copied).
604 ASSERT3U(svr
->svr_bytes_done
[txgoff
], >=,
606 svr
->svr_bytes_done
[txgoff
] -= inflight_size
;
607 svr
->svr_bytes_done
[txg
& TXG_MASK
] += inflight_size
;
610 ASSERT0(svr
->svr_max_offset_to_sync
[TXG_CLEAN(txg
) & TXG_MASK
]);
614 * The copy thread has not yet visited this offset. Ensure
618 DTRACE_PROBE3(remove__free__unvisited
,
623 if (svr
->svr_allocd_segs
!= NULL
)
624 range_tree_clear(svr
->svr_allocd_segs
, offset
, size
);
627 * Since we now do not need to copy this data, for
628 * accounting purposes we have done our job and can count
631 svr
->svr_bytes_done
[txg
& TXG_MASK
] += size
;
633 mutex_exit(&svr
->svr_lock
);
636 * Now that we have dropped svr_lock, process the synced portion
639 if (synced_size
> 0) {
640 vdev_indirect_mark_obsolete(vd
, synced_offset
, synced_size
);
643 * Note: this can only be called from syncing context,
644 * and the vdev_indirect_mapping is only changed from the
645 * sync thread, so we don't need svr_lock while doing
646 * metaslab_free_impl_cb.
648 boolean_t checkpoint
= B_FALSE
;
649 vdev_indirect_ops
.vdev_op_remap(vd
, synced_offset
, synced_size
,
650 metaslab_free_impl_cb
, &checkpoint
);
655 * Stop an active removal and update the spa_removing phys.
658 spa_finish_removal(spa_t
*spa
, dsl_scan_state_t state
, dmu_tx_t
*tx
)
660 spa_vdev_removal_t
*svr
= spa
->spa_vdev_removal
;
661 ASSERT3U(dmu_tx_get_txg(tx
), ==, spa_syncing_txg(spa
));
663 /* Ensure the removal thread has completed before we free the svr. */
664 spa_vdev_remove_suspend(spa
);
666 ASSERT(state
== DSS_FINISHED
|| state
== DSS_CANCELED
);
668 if (state
== DSS_FINISHED
) {
669 spa_removing_phys_t
*srp
= &spa
->spa_removing_phys
;
670 vdev_t
*vd
= vdev_lookup_top(spa
, svr
->svr_vdev_id
);
671 vdev_indirect_config_t
*vic
= &vd
->vdev_indirect_config
;
673 if (srp
->sr_prev_indirect_vdev
!= UINT64_MAX
) {
675 pvd
= vdev_lookup_top(spa
,
676 srp
->sr_prev_indirect_vdev
);
677 ASSERT3P(pvd
->vdev_ops
, ==, &vdev_indirect_ops
);
680 vic
->vic_prev_indirect_vdev
= srp
->sr_prev_indirect_vdev
;
681 srp
->sr_prev_indirect_vdev
= vd
->vdev_id
;
683 spa
->spa_removing_phys
.sr_state
= state
;
684 spa
->spa_removing_phys
.sr_end_time
= gethrestime_sec();
686 spa
->spa_vdev_removal
= NULL
;
687 spa_vdev_removal_destroy(svr
);
689 spa_sync_removing_state(spa
, tx
);
691 vdev_config_dirty(spa
->spa_root_vdev
);
695 free_mapped_segment_cb(void *arg
, uint64_t offset
, uint64_t size
)
698 vdev_indirect_mark_obsolete(vd
, offset
, size
);
699 boolean_t checkpoint
= B_FALSE
;
700 vdev_indirect_ops
.vdev_op_remap(vd
, offset
, size
,
701 metaslab_free_impl_cb
, &checkpoint
);
705 * On behalf of the removal thread, syncs an incremental bit more of
706 * the indirect mapping to disk and updates the in-memory mapping.
707 * Called as a sync task in every txg that the removal thread makes progress.
710 vdev_mapping_sync(void *arg
, dmu_tx_t
*tx
)
712 spa_vdev_removal_t
*svr
= arg
;
713 spa_t
*spa
= dmu_tx_pool(tx
)->dp_spa
;
714 vdev_t
*vd
= vdev_lookup_top(spa
, svr
->svr_vdev_id
);
715 ASSERTV(vdev_indirect_config_t
*vic
= &vd
->vdev_indirect_config
);
716 uint64_t txg
= dmu_tx_get_txg(tx
);
717 vdev_indirect_mapping_t
*vim
= vd
->vdev_indirect_mapping
;
719 ASSERT(vic
->vic_mapping_object
!= 0);
720 ASSERT3U(txg
, ==, spa_syncing_txg(spa
));
722 vdev_indirect_mapping_add_entries(vim
,
723 &svr
->svr_new_segments
[txg
& TXG_MASK
], tx
);
724 vdev_indirect_births_add_entry(vd
->vdev_indirect_births
,
725 vdev_indirect_mapping_max_offset(vim
), dmu_tx_get_txg(tx
), tx
);
728 * Free the copied data for anything that was freed while the
729 * mapping entries were in flight.
731 mutex_enter(&svr
->svr_lock
);
732 range_tree_vacate(svr
->svr_frees
[txg
& TXG_MASK
],
733 free_mapped_segment_cb
, vd
);
734 ASSERT3U(svr
->svr_max_offset_to_sync
[txg
& TXG_MASK
], >=,
735 vdev_indirect_mapping_max_offset(vim
));
736 svr
->svr_max_offset_to_sync
[txg
& TXG_MASK
] = 0;
737 mutex_exit(&svr
->svr_lock
);
739 spa_sync_removing_state(spa
, tx
);
742 typedef struct vdev_copy_segment_arg
{
744 dva_t
*vcsa_dest_dva
;
746 range_tree_t
*vcsa_obsolete_segs
;
747 } vdev_copy_segment_arg_t
;
750 unalloc_seg(void *arg
, uint64_t start
, uint64_t size
)
752 vdev_copy_segment_arg_t
*vcsa
= arg
;
753 spa_t
*spa
= vcsa
->vcsa_spa
;
754 blkptr_t bp
= { { { {0} } } };
756 BP_SET_BIRTH(&bp
, TXG_INITIAL
, TXG_INITIAL
);
757 BP_SET_LSIZE(&bp
, size
);
758 BP_SET_PSIZE(&bp
, size
);
759 BP_SET_COMPRESS(&bp
, ZIO_COMPRESS_OFF
);
760 BP_SET_CHECKSUM(&bp
, ZIO_CHECKSUM_OFF
);
761 BP_SET_TYPE(&bp
, DMU_OT_NONE
);
762 BP_SET_LEVEL(&bp
, 0);
763 BP_SET_DEDUP(&bp
, 0);
764 BP_SET_BYTEORDER(&bp
, ZFS_HOST_BYTEORDER
);
766 DVA_SET_VDEV(&bp
.blk_dva
[0], DVA_GET_VDEV(vcsa
->vcsa_dest_dva
));
767 DVA_SET_OFFSET(&bp
.blk_dva
[0],
768 DVA_GET_OFFSET(vcsa
->vcsa_dest_dva
) + start
);
769 DVA_SET_ASIZE(&bp
.blk_dva
[0], size
);
771 zio_free(spa
, vcsa
->vcsa_txg
, &bp
);
775 * All reads and writes associated with a call to spa_vdev_copy_segment()
779 spa_vdev_copy_segment_done(zio_t
*zio
)
781 vdev_copy_segment_arg_t
*vcsa
= zio
->io_private
;
783 range_tree_vacate(vcsa
->vcsa_obsolete_segs
,
785 range_tree_destroy(vcsa
->vcsa_obsolete_segs
);
786 kmem_free(vcsa
, sizeof (*vcsa
));
788 spa_config_exit(zio
->io_spa
, SCL_STATE
, zio
->io_spa
);
792 * The write of the new location is done.
795 spa_vdev_copy_segment_write_done(zio_t
*zio
)
797 vdev_copy_arg_t
*vca
= zio
->io_private
;
799 abd_free(zio
->io_abd
);
801 mutex_enter(&vca
->vca_lock
);
802 vca
->vca_outstanding_bytes
-= zio
->io_size
;
803 cv_signal(&vca
->vca_cv
);
804 mutex_exit(&vca
->vca_lock
);
808 * The read of the old location is done. The parent zio is the write to
809 * the new location. Allow it to start.
812 spa_vdev_copy_segment_read_done(zio_t
*zio
)
814 zio_nowait(zio_unique_parent(zio
));
818 * If the old and new vdevs are mirrors, we will read both sides of the old
819 * mirror, and write each copy to the corresponding side of the new mirror.
820 * If the old and new vdevs have a different number of children, we will do
821 * this as best as possible. Since we aren't verifying checksums, this
822 * ensures that as long as there's a good copy of the data, we'll have a
823 * good copy after the removal, even if there's silent damage to one side
824 * of the mirror. If we're removing a mirror that has some silent damage,
825 * we'll have exactly the same damage in the new location (assuming that
826 * the new location is also a mirror).
828 * We accomplish this by creating a tree of zio_t's, with as many writes as
829 * there are "children" of the new vdev (a non-redundant vdev counts as one
830 * child, a 2-way mirror has 2 children, etc). Each write has an associated
831 * read from a child of the old vdev. Typically there will be the same
832 * number of children of the old and new vdevs. However, if there are more
833 * children of the new vdev, some child(ren) of the old vdev will be issued
834 * multiple reads. If there are more children of the old vdev, some copies
837 * For example, the tree of zio_t's for a 2-way mirror is:
841 * write(new vdev, child 0) write(new vdev, child 1)
843 * read(old vdev, child 0) read(old vdev, child 1)
845 * Child zio's complete before their parents complete. However, zio's
846 * created with zio_vdev_child_io() may be issued before their children
847 * complete. In this case we need to make sure that the children (reads)
848 * complete before the parents (writes) are *issued*. We do this by not
849 * calling zio_nowait() on each write until its corresponding read has
852 * The spa_config_lock must be held while zio's created by
853 * zio_vdev_child_io() are in progress, to ensure that the vdev tree does
854 * not change (e.g. due to a concurrent "zpool attach/detach"). The "null"
855 * zio is needed to release the spa_config_lock after all the reads and
856 * writes complete. (Note that we can't grab the config lock for each read,
857 * because it is not reentrant - we could deadlock with a thread waiting
861 spa_vdev_copy_one_child(vdev_copy_arg_t
*vca
, zio_t
*nzio
,
862 vdev_t
*source_vd
, uint64_t source_offset
,
863 vdev_t
*dest_child_vd
, uint64_t dest_offset
, int dest_id
, uint64_t size
)
865 ASSERT3U(spa_config_held(nzio
->io_spa
, SCL_ALL
, RW_READER
), !=, 0);
867 mutex_enter(&vca
->vca_lock
);
868 vca
->vca_outstanding_bytes
+= size
;
869 mutex_exit(&vca
->vca_lock
);
871 abd_t
*abd
= abd_alloc_for_io(size
, B_FALSE
);
873 vdev_t
*source_child_vd
;
874 if (source_vd
->vdev_ops
== &vdev_mirror_ops
&& dest_id
!= -1) {
876 * Source and dest are both mirrors. Copy from the same
877 * child id as we are copying to (wrapping around if there
878 * are more dest children than source children).
881 source_vd
->vdev_child
[dest_id
% source_vd
->vdev_children
];
883 source_child_vd
= source_vd
;
886 zio_t
*write_zio
= zio_vdev_child_io(nzio
, NULL
,
887 dest_child_vd
, dest_offset
, abd
, size
,
888 ZIO_TYPE_WRITE
, ZIO_PRIORITY_REMOVAL
,
890 spa_vdev_copy_segment_write_done
, vca
);
892 zio_nowait(zio_vdev_child_io(write_zio
, NULL
,
893 source_child_vd
, source_offset
, abd
, size
,
894 ZIO_TYPE_READ
, ZIO_PRIORITY_REMOVAL
,
896 spa_vdev_copy_segment_read_done
, vca
));
900 * Allocate a new location for this segment, and create the zio_t's to
901 * read from the old location and write to the new location.
904 spa_vdev_copy_segment(vdev_t
*vd
, range_tree_t
*segs
,
905 uint64_t maxalloc
, uint64_t txg
,
906 vdev_copy_arg_t
*vca
, zio_alloc_list_t
*zal
)
908 metaslab_group_t
*mg
= vd
->vdev_mg
;
909 spa_t
*spa
= vd
->vdev_spa
;
910 spa_vdev_removal_t
*svr
= spa
->spa_vdev_removal
;
911 vdev_indirect_mapping_entry_t
*entry
;
913 uint64_t start
= range_tree_min(segs
);
915 ASSERT3U(maxalloc
, <=, SPA_MAXBLOCKSIZE
);
917 uint64_t size
= range_tree_span(segs
);
918 if (range_tree_span(segs
) > maxalloc
) {
920 * We can't allocate all the segments. Prefer to end
921 * the allocation at the end of a segment, thus avoiding
922 * additional split blocks.
926 search
.rs_start
= start
+ maxalloc
;
927 search
.rs_end
= search
.rs_start
;
928 range_seg_t
*rs
= avl_find(&segs
->rt_root
, &search
, &where
);
930 rs
= avl_nearest(&segs
->rt_root
, where
, AVL_BEFORE
);
932 rs
= AVL_PREV(&segs
->rt_root
, rs
);
935 size
= rs
->rs_end
- start
;
938 * There are no segments that end before maxalloc.
939 * I.e. the first segment is larger than maxalloc,
940 * so we must split it.
945 ASSERT3U(size
, <=, maxalloc
);
947 int error
= metaslab_alloc_dva(spa
, mg
->mg_class
, size
,
948 &dst
, 0, NULL
, txg
, 0, zal
, 0);
953 * Determine the ranges that are not actually needed. Offsets are
954 * relative to the start of the range to be copied (i.e. relative to the
955 * local variable "start").
957 range_tree_t
*obsolete_segs
= range_tree_create(NULL
, NULL
);
959 range_seg_t
*rs
= avl_first(&segs
->rt_root
);
960 ASSERT3U(rs
->rs_start
, ==, start
);
961 uint64_t prev_seg_end
= rs
->rs_end
;
962 while ((rs
= AVL_NEXT(&segs
->rt_root
, rs
)) != NULL
) {
963 if (rs
->rs_start
>= start
+ size
) {
966 range_tree_add(obsolete_segs
,
967 prev_seg_end
- start
,
968 rs
->rs_start
- prev_seg_end
);
970 prev_seg_end
= rs
->rs_end
;
972 /* We don't end in the middle of an obsolete range */
973 ASSERT3U(start
+ size
, <=, prev_seg_end
);
975 range_tree_clear(segs
, start
, size
);
978 * We can't have any padding of the allocated size, otherwise we will
979 * misunderstand what's allocated, and the size of the mapping.
980 * The caller ensures this will be true by passing in a size that is
981 * aligned to the worst (highest) ashift in the pool.
983 ASSERT3U(DVA_GET_ASIZE(&dst
), ==, size
);
985 entry
= kmem_zalloc(sizeof (vdev_indirect_mapping_entry_t
), KM_SLEEP
);
986 DVA_MAPPING_SET_SRC_OFFSET(&entry
->vime_mapping
, start
);
987 entry
->vime_mapping
.vimep_dst
= dst
;
988 if (spa_feature_is_enabled(spa
, SPA_FEATURE_OBSOLETE_COUNTS
)) {
989 entry
->vime_obsolete_count
= range_tree_space(obsolete_segs
);
992 vdev_copy_segment_arg_t
*vcsa
= kmem_zalloc(sizeof (*vcsa
), KM_SLEEP
);
993 vcsa
->vcsa_dest_dva
= &entry
->vime_mapping
.vimep_dst
;
994 vcsa
->vcsa_obsolete_segs
= obsolete_segs
;
995 vcsa
->vcsa_spa
= spa
;
996 vcsa
->vcsa_txg
= txg
;
999 * See comment before spa_vdev_copy_one_child().
1001 spa_config_enter(spa
, SCL_STATE
, spa
, RW_READER
);
1002 zio_t
*nzio
= zio_null(spa
->spa_txg_zio
[txg
& TXG_MASK
], spa
, NULL
,
1003 spa_vdev_copy_segment_done
, vcsa
, 0);
1004 vdev_t
*dest_vd
= vdev_lookup_top(spa
, DVA_GET_VDEV(&dst
));
1005 if (dest_vd
->vdev_ops
== &vdev_mirror_ops
) {
1006 for (int i
= 0; i
< dest_vd
->vdev_children
; i
++) {
1007 vdev_t
*child
= dest_vd
->vdev_child
[i
];
1008 spa_vdev_copy_one_child(vca
, nzio
, vd
, start
,
1009 child
, DVA_GET_OFFSET(&dst
), i
, size
);
1012 spa_vdev_copy_one_child(vca
, nzio
, vd
, start
,
1013 dest_vd
, DVA_GET_OFFSET(&dst
), -1, size
);
1017 list_insert_tail(&svr
->svr_new_segments
[txg
& TXG_MASK
], entry
);
1018 ASSERT3U(start
+ size
, <=, vd
->vdev_ms_count
<< vd
->vdev_ms_shift
);
1019 vdev_dirty(vd
, 0, NULL
, txg
);
1025 * Complete the removal of a toplevel vdev. This is called as a
1026 * synctask in the same txg that we will sync out the new config (to the
1027 * MOS object) which indicates that this vdev is indirect.
1030 vdev_remove_complete_sync(void *arg
, dmu_tx_t
*tx
)
1032 spa_vdev_removal_t
*svr
= arg
;
1033 spa_t
*spa
= dmu_tx_pool(tx
)->dp_spa
;
1034 vdev_t
*vd
= vdev_lookup_top(spa
, svr
->svr_vdev_id
);
1036 ASSERT3P(vd
->vdev_ops
, ==, &vdev_indirect_ops
);
1038 for (int i
= 0; i
< TXG_SIZE
; i
++) {
1039 ASSERT0(svr
->svr_bytes_done
[i
]);
1042 ASSERT3U(spa
->spa_removing_phys
.sr_copied
, ==,
1043 spa
->spa_removing_phys
.sr_to_copy
);
1045 vdev_destroy_spacemaps(vd
, tx
);
1047 /* destroy leaf zaps, if any */
1048 ASSERT3P(svr
->svr_zaplist
, !=, NULL
);
1049 for (nvpair_t
*pair
= nvlist_next_nvpair(svr
->svr_zaplist
, NULL
);
1051 pair
= nvlist_next_nvpair(svr
->svr_zaplist
, pair
)) {
1052 vdev_destroy_unlink_zap(vd
, fnvpair_value_uint64(pair
), tx
);
1054 fnvlist_free(svr
->svr_zaplist
);
1056 spa_finish_removal(dmu_tx_pool(tx
)->dp_spa
, DSS_FINISHED
, tx
);
1057 /* vd->vdev_path is not available here */
1058 spa_history_log_internal(spa
, "vdev remove completed", tx
,
1059 "%s vdev %llu", spa_name(spa
), vd
->vdev_id
);
1063 vdev_remove_enlist_zaps(vdev_t
*vd
, nvlist_t
*zlist
)
1065 ASSERT3P(zlist
, !=, NULL
);
1066 ASSERT3P(vd
->vdev_ops
, !=, &vdev_raidz_ops
);
1068 if (vd
->vdev_leaf_zap
!= 0) {
1070 (void) snprintf(zkey
, sizeof (zkey
), "%s-%llu",
1071 VDEV_REMOVAL_ZAP_OBJS
, (u_longlong_t
)vd
->vdev_leaf_zap
);
1072 fnvlist_add_uint64(zlist
, zkey
, vd
->vdev_leaf_zap
);
1075 for (uint64_t id
= 0; id
< vd
->vdev_children
; id
++) {
1076 vdev_remove_enlist_zaps(vd
->vdev_child
[id
], zlist
);
1081 vdev_remove_replace_with_indirect(vdev_t
*vd
, uint64_t txg
)
1085 spa_t
*spa
= vd
->vdev_spa
;
1086 spa_vdev_removal_t
*svr
= spa
->spa_vdev_removal
;
1089 * First, build a list of leaf zaps to be destroyed.
1090 * This is passed to the sync context thread,
1091 * which does the actual unlinking.
1093 svr
->svr_zaplist
= fnvlist_alloc();
1094 vdev_remove_enlist_zaps(vd
, svr
->svr_zaplist
);
1096 ivd
= vdev_add_parent(vd
, &vdev_indirect_ops
);
1097 ivd
->vdev_removing
= 0;
1099 vd
->vdev_leaf_zap
= 0;
1101 vdev_remove_child(ivd
, vd
);
1102 vdev_compact_children(ivd
);
1104 ASSERT(!list_link_active(&vd
->vdev_state_dirty_node
));
1106 tx
= dmu_tx_create_assigned(spa
->spa_dsl_pool
, txg
);
1107 dsl_sync_task_nowait(spa
->spa_dsl_pool
, vdev_remove_complete_sync
, svr
,
1108 0, ZFS_SPACE_CHECK_NONE
, tx
);
1112 * Indicate that this thread has exited.
1113 * After this, we can not use svr.
1115 mutex_enter(&svr
->svr_lock
);
1116 svr
->svr_thread
= NULL
;
1117 cv_broadcast(&svr
->svr_cv
);
1118 mutex_exit(&svr
->svr_lock
);
1122 * Complete the removal of a toplevel vdev. This is called in open
1123 * context by the removal thread after we have copied all vdev's data.
1126 vdev_remove_complete(spa_t
*spa
)
1131 * Wait for any deferred frees to be synced before we call
1132 * vdev_metaslab_fini()
1134 txg_wait_synced(spa
->spa_dsl_pool
, 0);
1135 txg
= spa_vdev_enter(spa
);
1136 vdev_t
*vd
= vdev_lookup_top(spa
, spa
->spa_vdev_removal
->svr_vdev_id
);
1138 sysevent_t
*ev
= spa_event_create(spa
, vd
, NULL
,
1139 ESC_ZFS_VDEV_REMOVE_DEV
);
1141 zfs_dbgmsg("finishing device removal for vdev %llu in txg %llu",
1145 * Discard allocation state.
1147 if (vd
->vdev_mg
!= NULL
) {
1148 vdev_metaslab_fini(vd
);
1149 metaslab_group_destroy(vd
->vdev_mg
);
1152 ASSERT0(vd
->vdev_stat
.vs_space
);
1153 ASSERT0(vd
->vdev_stat
.vs_dspace
);
1155 vdev_remove_replace_with_indirect(vd
, txg
);
1158 * We now release the locks, allowing spa_sync to run and finish the
1159 * removal via vdev_remove_complete_sync in syncing context.
1161 * Note that we hold on to the vdev_t that has been replaced. Since
1162 * it isn't part of the vdev tree any longer, it can't be concurrently
1163 * manipulated, even while we don't have the config lock.
1165 (void) spa_vdev_exit(spa
, NULL
, txg
, 0);
1168 * Top ZAP should have been transferred to the indirect vdev in
1169 * vdev_remove_replace_with_indirect.
1171 ASSERT0(vd
->vdev_top_zap
);
1174 * Leaf ZAP should have been moved in vdev_remove_replace_with_indirect.
1176 ASSERT0(vd
->vdev_leaf_zap
);
1178 txg
= spa_vdev_enter(spa
);
1179 (void) vdev_label_init(vd
, 0, VDEV_LABEL_REMOVE
);
1181 * Request to update the config and the config cachefile.
1183 vdev_config_dirty(spa
->spa_root_vdev
);
1184 (void) spa_vdev_exit(spa
, vd
, txg
, 0);
1191 * Evacuates a segment of size at most max_alloc from the vdev
1192 * via repeated calls to spa_vdev_copy_segment. If an allocation
1193 * fails, the pool is probably too fragmented to handle such a
1194 * large size, so decrease max_alloc so that the caller will not try
1195 * this size again this txg.
1198 spa_vdev_copy_impl(vdev_t
*vd
, spa_vdev_removal_t
*svr
, vdev_copy_arg_t
*vca
,
1199 uint64_t *max_alloc
, dmu_tx_t
*tx
)
1201 uint64_t txg
= dmu_tx_get_txg(tx
);
1202 spa_t
*spa
= dmu_tx_pool(tx
)->dp_spa
;
1204 mutex_enter(&svr
->svr_lock
);
1207 * Determine how big of a chunk to copy. We can allocate up
1208 * to max_alloc bytes, and we can span up to vdev_removal_max_span
1209 * bytes of unallocated space at a time. "segs" will track the
1210 * allocated segments that we are copying. We may also be copying
1211 * free segments (of up to vdev_removal_max_span bytes).
1213 range_tree_t
*segs
= range_tree_create(NULL
, NULL
);
1215 range_seg_t
*rs
= range_tree_first(svr
->svr_allocd_segs
);
1220 uint64_t seg_length
;
1222 if (range_tree_is_empty(segs
)) {
1223 /* need to truncate the first seg based on max_alloc */
1225 MIN(rs
->rs_end
- rs
->rs_start
, *max_alloc
);
1227 if (rs
->rs_start
- range_tree_max(segs
) >
1228 vdev_removal_max_span
) {
1230 * Including this segment would cause us to
1231 * copy a larger unneeded chunk than is allowed.
1234 } else if (rs
->rs_end
- range_tree_min(segs
) >
1237 * This additional segment would extend past
1238 * max_alloc. Rather than splitting this
1239 * segment, leave it for the next mapping.
1243 seg_length
= rs
->rs_end
- rs
->rs_start
;
1247 range_tree_add(segs
, rs
->rs_start
, seg_length
);
1248 range_tree_remove(svr
->svr_allocd_segs
,
1249 rs
->rs_start
, seg_length
);
1252 if (range_tree_is_empty(segs
)) {
1253 mutex_exit(&svr
->svr_lock
);
1254 range_tree_destroy(segs
);
1258 if (svr
->svr_max_offset_to_sync
[txg
& TXG_MASK
] == 0) {
1259 dsl_sync_task_nowait(dmu_tx_pool(tx
), vdev_mapping_sync
,
1260 svr
, 0, ZFS_SPACE_CHECK_NONE
, tx
);
1263 svr
->svr_max_offset_to_sync
[txg
& TXG_MASK
] = range_tree_max(segs
);
1266 * Note: this is the amount of *allocated* space
1267 * that we are taking care of each txg.
1269 svr
->svr_bytes_done
[txg
& TXG_MASK
] += range_tree_space(segs
);
1271 mutex_exit(&svr
->svr_lock
);
1273 zio_alloc_list_t zal
;
1274 metaslab_trace_init(&zal
);
1275 uint64_t thismax
= SPA_MAXBLOCKSIZE
;
1276 while (!range_tree_is_empty(segs
)) {
1277 int error
= spa_vdev_copy_segment(vd
,
1278 segs
, thismax
, txg
, vca
, &zal
);
1280 if (error
== ENOSPC
) {
1282 * Cut our segment in half, and don't try this
1283 * segment size again this txg. Note that the
1284 * allocation size must be aligned to the highest
1285 * ashift in the pool, so that the allocation will
1286 * not be padded out to a multiple of the ashift,
1287 * which could cause us to think that this mapping
1288 * is larger than we intended.
1290 ASSERT3U(spa
->spa_max_ashift
, >=, SPA_MINBLOCKSHIFT
);
1291 ASSERT3U(spa
->spa_max_ashift
, ==, spa
->spa_min_ashift
);
1292 uint64_t attempted
=
1293 MIN(range_tree_span(segs
), thismax
);
1294 thismax
= P2ROUNDUP(attempted
/ 2,
1295 1 << spa
->spa_max_ashift
);
1297 * The minimum-size allocation can not fail.
1299 ASSERT3U(attempted
, >, 1 << spa
->spa_max_ashift
);
1300 *max_alloc
= attempted
- (1 << spa
->spa_max_ashift
);
1305 * We've performed an allocation, so reset the
1308 metaslab_trace_fini(&zal
);
1309 metaslab_trace_init(&zal
);
1312 metaslab_trace_fini(&zal
);
1313 range_tree_destroy(segs
);
1317 * The removal thread operates in open context. It iterates over all
1318 * allocated space in the vdev, by loading each metaslab's spacemap.
1319 * For each contiguous segment of allocated space (capping the segment
1320 * size at SPA_MAXBLOCKSIZE), we:
1321 * - Allocate space for it on another vdev.
1322 * - Create a new mapping from the old location to the new location
1323 * (as a record in svr_new_segments).
1324 * - Initiate a physical read zio to get the data off the removing disk.
1325 * - In the read zio's done callback, initiate a physical write zio to
1326 * write it to the new vdev.
1327 * Note that all of this will take effect when a particular TXG syncs.
1328 * The sync thread ensures that all the phys reads and writes for the syncing
1329 * TXG have completed (see spa_txg_zio) and writes the new mappings to disk
1330 * (see vdev_mapping_sync()).
1333 spa_vdev_remove_thread(void *arg
)
1336 spa_vdev_removal_t
*svr
= spa
->spa_vdev_removal
;
1337 vdev_copy_arg_t vca
;
1338 uint64_t max_alloc
= zfs_remove_max_segment
;
1339 uint64_t last_txg
= 0;
1341 spa_config_enter(spa
, SCL_CONFIG
, FTAG
, RW_READER
);
1342 vdev_t
*vd
= vdev_lookup_top(spa
, svr
->svr_vdev_id
);
1343 vdev_indirect_mapping_t
*vim
= vd
->vdev_indirect_mapping
;
1344 uint64_t start_offset
= vdev_indirect_mapping_max_offset(vim
);
1346 ASSERT3P(vd
->vdev_ops
, !=, &vdev_indirect_ops
);
1347 ASSERT(vdev_is_concrete(vd
));
1348 ASSERT(vd
->vdev_removing
);
1349 ASSERT(vd
->vdev_indirect_config
.vic_mapping_object
!= 0);
1350 ASSERT(vim
!= NULL
);
1352 mutex_init(&vca
.vca_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
1353 cv_init(&vca
.vca_cv
, NULL
, CV_DEFAULT
, NULL
);
1354 vca
.vca_outstanding_bytes
= 0;
1356 mutex_enter(&svr
->svr_lock
);
1359 * Start from vim_max_offset so we pick up where we left off
1360 * if we are restarting the removal after opening the pool.
1363 for (msi
= start_offset
>> vd
->vdev_ms_shift
;
1364 msi
< vd
->vdev_ms_count
&& !svr
->svr_thread_exit
; msi
++) {
1365 metaslab_t
*msp
= vd
->vdev_ms
[msi
];
1366 ASSERT3U(msi
, <=, vd
->vdev_ms_count
);
1368 ASSERT0(range_tree_space(svr
->svr_allocd_segs
));
1370 mutex_enter(&msp
->ms_sync_lock
);
1371 mutex_enter(&msp
->ms_lock
);
1374 * Assert nothing in flight -- ms_*tree is empty.
1376 for (int i
= 0; i
< TXG_SIZE
; i
++) {
1377 ASSERT0(range_tree_space(msp
->ms_allocating
[i
]));
1381 * If the metaslab has ever been allocated from (ms_sm!=NULL),
1382 * read the allocated segments from the space map object
1383 * into svr_allocd_segs. Since we do this while holding
1384 * svr_lock and ms_sync_lock, concurrent frees (which
1385 * would have modified the space map) will wait for us
1386 * to finish loading the spacemap, and then take the
1387 * appropriate action (see free_from_removing_vdev()).
1389 if (msp
->ms_sm
!= NULL
) {
1390 space_map_t
*sm
= NULL
;
1393 * We have to open a new space map here, because
1394 * ms_sm's sm_length and sm_alloc may not reflect
1395 * what's in the object contents, if we are in between
1396 * metaslab_sync() and metaslab_sync_done().
1398 VERIFY0(space_map_open(&sm
,
1399 spa
->spa_dsl_pool
->dp_meta_objset
,
1400 msp
->ms_sm
->sm_object
, msp
->ms_sm
->sm_start
,
1401 msp
->ms_sm
->sm_size
, msp
->ms_sm
->sm_shift
));
1402 space_map_update(sm
);
1403 VERIFY0(space_map_load(sm
, svr
->svr_allocd_segs
,
1405 space_map_close(sm
);
1407 range_tree_walk(msp
->ms_freeing
,
1408 range_tree_remove
, svr
->svr_allocd_segs
);
1411 * When we are resuming from a paused removal (i.e.
1412 * when importing a pool with a removal in progress),
1413 * discard any state that we have already processed.
1415 range_tree_clear(svr
->svr_allocd_segs
, 0, start_offset
);
1417 mutex_exit(&msp
->ms_lock
);
1418 mutex_exit(&msp
->ms_sync_lock
);
1421 zfs_dbgmsg("copying %llu segments for metaslab %llu",
1422 avl_numnodes(&svr
->svr_allocd_segs
->rt_root
),
1425 while (!svr
->svr_thread_exit
&&
1426 !range_tree_is_empty(svr
->svr_allocd_segs
)) {
1428 mutex_exit(&svr
->svr_lock
);
1431 * We need to periodically drop the config lock so that
1432 * writers can get in. Additionally, we can't wait
1433 * for a txg to sync while holding a config lock
1434 * (since a waiting writer could cause a 3-way deadlock
1435 * with the sync thread, which also gets a config
1436 * lock for reader). So we can't hold the config lock
1437 * while calling dmu_tx_assign().
1439 spa_config_exit(spa
, SCL_CONFIG
, FTAG
);
1442 * This delay will pause the removal around the point
1443 * specified by zfs_remove_max_bytes_pause. We do this
1444 * solely from the test suite or during debugging.
1446 uint64_t bytes_copied
=
1447 spa
->spa_removing_phys
.sr_copied
;
1448 for (int i
= 0; i
< TXG_SIZE
; i
++)
1449 bytes_copied
+= svr
->svr_bytes_done
[i
];
1450 while (zfs_remove_max_bytes_pause
<= bytes_copied
&&
1451 !svr
->svr_thread_exit
)
1454 mutex_enter(&vca
.vca_lock
);
1455 while (vca
.vca_outstanding_bytes
>
1456 zfs_remove_max_copy_bytes
) {
1457 cv_wait(&vca
.vca_cv
, &vca
.vca_lock
);
1459 mutex_exit(&vca
.vca_lock
);
1462 dmu_tx_create_dd(spa_get_dsl(spa
)->dp_mos_dir
);
1463 dmu_tx_hold_space(tx
, SPA_MAXBLOCKSIZE
);
1464 VERIFY0(dmu_tx_assign(tx
, TXG_WAIT
));
1465 uint64_t txg
= dmu_tx_get_txg(tx
);
1468 * Reacquire the vdev_config lock. The vdev_t
1469 * that we're removing may have changed, e.g. due
1470 * to a vdev_attach or vdev_detach.
1472 spa_config_enter(spa
, SCL_CONFIG
, FTAG
, RW_READER
);
1473 vd
= vdev_lookup_top(spa
, svr
->svr_vdev_id
);
1475 if (txg
!= last_txg
)
1476 max_alloc
= zfs_remove_max_segment
;
1479 spa_vdev_copy_impl(vd
, svr
, &vca
, &max_alloc
, tx
);
1482 mutex_enter(&svr
->svr_lock
);
1486 mutex_exit(&svr
->svr_lock
);
1488 spa_config_exit(spa
, SCL_CONFIG
, FTAG
);
1491 * Wait for all copies to finish before cleaning up the vca.
1493 txg_wait_synced(spa
->spa_dsl_pool
, 0);
1494 ASSERT0(vca
.vca_outstanding_bytes
);
1496 mutex_destroy(&vca
.vca_lock
);
1497 cv_destroy(&vca
.vca_cv
);
1499 if (svr
->svr_thread_exit
) {
1500 mutex_enter(&svr
->svr_lock
);
1501 range_tree_vacate(svr
->svr_allocd_segs
, NULL
, NULL
);
1502 svr
->svr_thread
= NULL
;
1503 cv_broadcast(&svr
->svr_cv
);
1504 mutex_exit(&svr
->svr_lock
);
1506 ASSERT0(range_tree_space(svr
->svr_allocd_segs
));
1507 vdev_remove_complete(spa
);
1512 spa_vdev_remove_suspend(spa_t
*spa
)
1514 spa_vdev_removal_t
*svr
= spa
->spa_vdev_removal
;
1519 mutex_enter(&svr
->svr_lock
);
1520 svr
->svr_thread_exit
= B_TRUE
;
1521 while (svr
->svr_thread
!= NULL
)
1522 cv_wait(&svr
->svr_cv
, &svr
->svr_lock
);
1523 svr
->svr_thread_exit
= B_FALSE
;
1524 mutex_exit(&svr
->svr_lock
);
1529 spa_vdev_remove_cancel_check(void *arg
, dmu_tx_t
*tx
)
1531 spa_t
*spa
= dmu_tx_pool(tx
)->dp_spa
;
1533 if (spa
->spa_vdev_removal
== NULL
)
1534 return (ENOTACTIVE
);
1539 * Cancel a removal by freeing all entries from the partial mapping
1540 * and marking the vdev as no longer being removing.
1544 spa_vdev_remove_cancel_sync(void *arg
, dmu_tx_t
*tx
)
1546 spa_t
*spa
= dmu_tx_pool(tx
)->dp_spa
;
1547 spa_vdev_removal_t
*svr
= spa
->spa_vdev_removal
;
1548 vdev_t
*vd
= vdev_lookup_top(spa
, svr
->svr_vdev_id
);
1549 vdev_indirect_config_t
*vic
= &vd
->vdev_indirect_config
;
1550 vdev_indirect_mapping_t
*vim
= vd
->vdev_indirect_mapping
;
1551 objset_t
*mos
= spa
->spa_meta_objset
;
1553 ASSERT3P(svr
->svr_thread
, ==, NULL
);
1555 spa_feature_decr(spa
, SPA_FEATURE_DEVICE_REMOVAL
, tx
);
1556 if (vdev_obsolete_counts_are_precise(vd
)) {
1557 spa_feature_decr(spa
, SPA_FEATURE_OBSOLETE_COUNTS
, tx
);
1558 VERIFY0(zap_remove(spa
->spa_meta_objset
, vd
->vdev_top_zap
,
1559 VDEV_TOP_ZAP_OBSOLETE_COUNTS_ARE_PRECISE
, tx
));
1562 if (vdev_obsolete_sm_object(vd
) != 0) {
1563 ASSERT(vd
->vdev_obsolete_sm
!= NULL
);
1564 ASSERT3U(vdev_obsolete_sm_object(vd
), ==,
1565 space_map_object(vd
->vdev_obsolete_sm
));
1567 space_map_free(vd
->vdev_obsolete_sm
, tx
);
1568 VERIFY0(zap_remove(spa
->spa_meta_objset
, vd
->vdev_top_zap
,
1569 VDEV_TOP_ZAP_INDIRECT_OBSOLETE_SM
, tx
));
1570 space_map_close(vd
->vdev_obsolete_sm
);
1571 vd
->vdev_obsolete_sm
= NULL
;
1572 spa_feature_decr(spa
, SPA_FEATURE_OBSOLETE_COUNTS
, tx
);
1574 for (int i
= 0; i
< TXG_SIZE
; i
++) {
1575 ASSERT(list_is_empty(&svr
->svr_new_segments
[i
]));
1576 ASSERT3U(svr
->svr_max_offset_to_sync
[i
], <=,
1577 vdev_indirect_mapping_max_offset(vim
));
1580 for (uint64_t msi
= 0; msi
< vd
->vdev_ms_count
; msi
++) {
1581 metaslab_t
*msp
= vd
->vdev_ms
[msi
];
1583 if (msp
->ms_start
>= vdev_indirect_mapping_max_offset(vim
))
1586 ASSERT0(range_tree_space(svr
->svr_allocd_segs
));
1588 mutex_enter(&msp
->ms_lock
);
1591 * Assert nothing in flight -- ms_*tree is empty.
1593 for (int i
= 0; i
< TXG_SIZE
; i
++)
1594 ASSERT0(range_tree_space(msp
->ms_allocating
[i
]));
1595 for (int i
= 0; i
< TXG_DEFER_SIZE
; i
++)
1596 ASSERT0(range_tree_space(msp
->ms_defer
[i
]));
1597 ASSERT0(range_tree_space(msp
->ms_freed
));
1599 if (msp
->ms_sm
!= NULL
) {
1601 * Assert that the in-core spacemap has the same
1602 * length as the on-disk one, so we can use the
1603 * existing in-core spacemap to load it from disk.
1605 ASSERT3U(msp
->ms_sm
->sm_alloc
, ==,
1606 msp
->ms_sm
->sm_phys
->smp_alloc
);
1607 ASSERT3U(msp
->ms_sm
->sm_length
, ==,
1608 msp
->ms_sm
->sm_phys
->smp_objsize
);
1610 mutex_enter(&svr
->svr_lock
);
1611 VERIFY0(space_map_load(msp
->ms_sm
,
1612 svr
->svr_allocd_segs
, SM_ALLOC
));
1613 range_tree_walk(msp
->ms_freeing
,
1614 range_tree_remove
, svr
->svr_allocd_segs
);
1617 * Clear everything past what has been synced,
1618 * because we have not allocated mappings for it yet.
1620 uint64_t syncd
= vdev_indirect_mapping_max_offset(vim
);
1621 uint64_t sm_end
= msp
->ms_sm
->sm_start
+
1622 msp
->ms_sm
->sm_size
;
1624 range_tree_clear(svr
->svr_allocd_segs
,
1625 syncd
, sm_end
- syncd
);
1627 mutex_exit(&svr
->svr_lock
);
1629 mutex_exit(&msp
->ms_lock
);
1631 mutex_enter(&svr
->svr_lock
);
1632 range_tree_vacate(svr
->svr_allocd_segs
,
1633 free_mapped_segment_cb
, vd
);
1634 mutex_exit(&svr
->svr_lock
);
1638 * Note: this must happen after we invoke free_mapped_segment_cb,
1639 * because it adds to the obsolete_segments.
1641 range_tree_vacate(vd
->vdev_obsolete_segments
, NULL
, NULL
);
1643 ASSERT3U(vic
->vic_mapping_object
, ==,
1644 vdev_indirect_mapping_object(vd
->vdev_indirect_mapping
));
1645 vdev_indirect_mapping_close(vd
->vdev_indirect_mapping
);
1646 vd
->vdev_indirect_mapping
= NULL
;
1647 vdev_indirect_mapping_free(mos
, vic
->vic_mapping_object
, tx
);
1648 vic
->vic_mapping_object
= 0;
1650 ASSERT3U(vic
->vic_births_object
, ==,
1651 vdev_indirect_births_object(vd
->vdev_indirect_births
));
1652 vdev_indirect_births_close(vd
->vdev_indirect_births
);
1653 vd
->vdev_indirect_births
= NULL
;
1654 vdev_indirect_births_free(mos
, vic
->vic_births_object
, tx
);
1655 vic
->vic_births_object
= 0;
1658 * We may have processed some frees from the removing vdev in this
1659 * txg, thus increasing svr_bytes_done; discard that here to
1660 * satisfy the assertions in spa_vdev_removal_destroy().
1661 * Note that future txg's can not have any bytes_done, because
1662 * future TXG's are only modified from open context, and we have
1663 * already shut down the copying thread.
1665 svr
->svr_bytes_done
[dmu_tx_get_txg(tx
) & TXG_MASK
] = 0;
1666 spa_finish_removal(spa
, DSS_CANCELED
, tx
);
1668 vd
->vdev_removing
= B_FALSE
;
1669 vdev_config_dirty(vd
);
1671 zfs_dbgmsg("canceled device removal for vdev %llu in %llu",
1672 vd
->vdev_id
, dmu_tx_get_txg(tx
));
1673 spa_history_log_internal(spa
, "vdev remove canceled", tx
,
1674 "%s vdev %llu %s", spa_name(spa
),
1675 vd
->vdev_id
, (vd
->vdev_path
!= NULL
) ? vd
->vdev_path
: "-");
1679 spa_vdev_remove_cancel(spa_t
*spa
)
1681 spa_vdev_remove_suspend(spa
);
1683 if (spa
->spa_vdev_removal
== NULL
)
1684 return (ENOTACTIVE
);
1686 uint64_t vdid
= spa
->spa_vdev_removal
->svr_vdev_id
;
1688 int error
= dsl_sync_task(spa
->spa_name
, spa_vdev_remove_cancel_check
,
1689 spa_vdev_remove_cancel_sync
, NULL
, 0,
1690 ZFS_SPACE_CHECK_EXTRA_RESERVED
);
1693 spa_config_enter(spa
, SCL_ALLOC
| SCL_VDEV
, FTAG
, RW_WRITER
);
1694 vdev_t
*vd
= vdev_lookup_top(spa
, vdid
);
1695 metaslab_group_activate(vd
->vdev_mg
);
1696 spa_config_exit(spa
, SCL_ALLOC
| SCL_VDEV
, FTAG
);
1703 * Called every sync pass of every txg if there's a svr.
1706 svr_sync(spa_t
*spa
, dmu_tx_t
*tx
)
1708 spa_vdev_removal_t
*svr
= spa
->spa_vdev_removal
;
1709 int txgoff
= dmu_tx_get_txg(tx
) & TXG_MASK
;
1712 * This check is necessary so that we do not dirty the
1713 * DIRECTORY_OBJECT via spa_sync_removing_state() when there
1714 * is nothing to do. Dirtying it every time would prevent us
1715 * from syncing-to-convergence.
1717 if (svr
->svr_bytes_done
[txgoff
] == 0)
1721 * Update progress accounting.
1723 spa
->spa_removing_phys
.sr_copied
+= svr
->svr_bytes_done
[txgoff
];
1724 svr
->svr_bytes_done
[txgoff
] = 0;
1726 spa_sync_removing_state(spa
, tx
);
1730 vdev_remove_make_hole_and_free(vdev_t
*vd
)
1732 uint64_t id
= vd
->vdev_id
;
1733 spa_t
*spa
= vd
->vdev_spa
;
1734 vdev_t
*rvd
= spa
->spa_root_vdev
;
1735 boolean_t last_vdev
= (id
== (rvd
->vdev_children
- 1));
1737 ASSERT(MUTEX_HELD(&spa_namespace_lock
));
1738 ASSERT(spa_config_held(spa
, SCL_ALL
, RW_WRITER
) == SCL_ALL
);
1743 vdev_compact_children(rvd
);
1745 vd
= vdev_alloc_common(spa
, id
, 0, &vdev_hole_ops
);
1746 vdev_add_child(rvd
, vd
);
1748 vdev_config_dirty(rvd
);
1751 * Reassess the health of our root vdev.
1757 * Remove a log device. The config lock is held for the specified TXG.
1760 spa_vdev_remove_log(vdev_t
*vd
, uint64_t *txg
)
1762 metaslab_group_t
*mg
= vd
->vdev_mg
;
1763 spa_t
*spa
= vd
->vdev_spa
;
1766 ASSERT(vd
->vdev_islog
);
1767 ASSERT(vd
== vd
->vdev_top
);
1770 * Stop allocating from this vdev.
1772 metaslab_group_passivate(mg
);
1775 * Wait for the youngest allocations and frees to sync,
1776 * and then wait for the deferral of those frees to finish.
1778 spa_vdev_config_exit(spa
, NULL
,
1779 *txg
+ TXG_CONCURRENT_STATES
+ TXG_DEFER_SIZE
, 0, FTAG
);
1782 * Evacuate the device. We don't hold the config lock as writer
1783 * since we need to do I/O but we do keep the
1784 * spa_namespace_lock held. Once this completes the device
1785 * should no longer have any blocks allocated on it.
1787 if (vd
->vdev_islog
) {
1788 if (vd
->vdev_stat
.vs_alloc
!= 0)
1789 error
= spa_reset_logs(spa
);
1792 *txg
= spa_vdev_config_enter(spa
);
1795 metaslab_group_activate(mg
);
1798 ASSERT0(vd
->vdev_stat
.vs_alloc
);
1801 * The evacuation succeeded. Remove any remaining MOS metadata
1802 * associated with this vdev, and wait for these changes to sync.
1804 vd
->vdev_removing
= B_TRUE
;
1806 vdev_dirty_leaves(vd
, VDD_DTL
, *txg
);
1807 vdev_config_dirty(vd
);
1809 spa_history_log_internal(spa
, "vdev remove", NULL
,
1810 "%s vdev %llu (log) %s", spa_name(spa
), vd
->vdev_id
,
1811 (vd
->vdev_path
!= NULL
) ? vd
->vdev_path
: "-");
1813 spa_vdev_config_exit(spa
, NULL
, *txg
, 0, FTAG
);
1815 *txg
= spa_vdev_config_enter(spa
);
1817 sysevent_t
*ev
= spa_event_create(spa
, vd
, NULL
,
1818 ESC_ZFS_VDEV_REMOVE_DEV
);
1819 ASSERT(MUTEX_HELD(&spa_namespace_lock
));
1820 ASSERT(spa_config_held(spa
, SCL_ALL
, RW_WRITER
) == SCL_ALL
);
1822 /* The top ZAP should have been destroyed by vdev_remove_empty. */
1823 ASSERT0(vd
->vdev_top_zap
);
1824 /* The leaf ZAP should have been destroyed by vdev_dtl_sync. */
1825 ASSERT0(vd
->vdev_leaf_zap
);
1827 (void) vdev_label_init(vd
, 0, VDEV_LABEL_REMOVE
);
1829 if (list_link_active(&vd
->vdev_state_dirty_node
))
1830 vdev_state_clean(vd
);
1831 if (list_link_active(&vd
->vdev_config_dirty_node
))
1832 vdev_config_clean(vd
);
1835 * Clean up the vdev namespace.
1837 vdev_remove_make_hole_and_free(vd
);
1846 spa_vdev_remove_top_check(vdev_t
*vd
)
1848 spa_t
*spa
= vd
->vdev_spa
;
1850 if (vd
!= vd
->vdev_top
)
1851 return (SET_ERROR(ENOTSUP
));
1853 if (!spa_feature_is_enabled(spa
, SPA_FEATURE_DEVICE_REMOVAL
))
1854 return (SET_ERROR(ENOTSUP
));
1857 * There has to be enough free space to remove the
1858 * device and leave double the "slop" space (i.e. we
1859 * must leave at least 3% of the pool free, in addition to
1860 * the normal slop space).
1862 if (dsl_dir_space_available(spa
->spa_dsl_pool
->dp_root_dir
,
1864 vd
->vdev_stat
.vs_dspace
+ spa_get_slop_space(spa
)) {
1865 return (SET_ERROR(ENOSPC
));
1869 * There can not be a removal in progress.
1871 if (spa
->spa_removing_phys
.sr_state
== DSS_SCANNING
)
1872 return (SET_ERROR(EBUSY
));
1875 * The device must have all its data.
1877 if (!vdev_dtl_empty(vd
, DTL_MISSING
) ||
1878 !vdev_dtl_empty(vd
, DTL_OUTAGE
))
1879 return (SET_ERROR(EBUSY
));
1882 * The device must be healthy.
1884 if (!vdev_readable(vd
))
1885 return (SET_ERROR(EIO
));
1888 * All vdevs in normal class must have the same ashift.
1890 if (spa
->spa_max_ashift
!= spa
->spa_min_ashift
) {
1891 return (SET_ERROR(EINVAL
));
1895 * All vdevs in normal class must have the same ashift
1898 vdev_t
*rvd
= spa
->spa_root_vdev
;
1899 int num_indirect
= 0;
1900 for (uint64_t id
= 0; id
< rvd
->vdev_children
; id
++) {
1901 vdev_t
*cvd
= rvd
->vdev_child
[id
];
1902 if (cvd
->vdev_ashift
!= 0 && !cvd
->vdev_islog
)
1903 ASSERT3U(cvd
->vdev_ashift
, ==, spa
->spa_max_ashift
);
1904 if (cvd
->vdev_ops
== &vdev_indirect_ops
)
1906 if (!vdev_is_concrete(cvd
))
1908 if (cvd
->vdev_ops
== &vdev_raidz_ops
)
1909 return (SET_ERROR(EINVAL
));
1911 * Need the mirror to be mirror of leaf vdevs only
1913 if (cvd
->vdev_ops
== &vdev_mirror_ops
) {
1914 for (uint64_t cid
= 0;
1915 cid
< cvd
->vdev_children
; cid
++) {
1916 if (!cvd
->vdev_child
[cid
]->vdev_ops
->
1918 return (SET_ERROR(EINVAL
));
1927 * Initiate removal of a top-level vdev, reducing the total space in the pool.
1928 * The config lock is held for the specified TXG. Once initiated,
1929 * evacuation of all allocated space (copying it to other vdevs) happens
1930 * in the background (see spa_vdev_remove_thread()), and can be canceled
1931 * (see spa_vdev_remove_cancel()). If successful, the vdev will
1932 * be transformed to an indirect vdev (see spa_vdev_remove_complete()).
1935 spa_vdev_remove_top(vdev_t
*vd
, uint64_t *txg
)
1937 spa_t
*spa
= vd
->vdev_spa
;
1941 * Check for errors up-front, so that we don't waste time
1942 * passivating the metaslab group and clearing the ZIL if there
1945 error
= spa_vdev_remove_top_check(vd
);
1950 * Stop allocating from this vdev. Note that we must check
1951 * that this is not the only device in the pool before
1952 * passivating, otherwise we will not be able to make
1953 * progress because we can't allocate from any vdevs.
1954 * The above check for sufficient free space serves this
1957 metaslab_group_t
*mg
= vd
->vdev_mg
;
1958 metaslab_group_passivate(mg
);
1961 * Wait for the youngest allocations and frees to sync,
1962 * and then wait for the deferral of those frees to finish.
1964 spa_vdev_config_exit(spa
, NULL
,
1965 *txg
+ TXG_CONCURRENT_STATES
+ TXG_DEFER_SIZE
, 0, FTAG
);
1968 * We must ensure that no "stubby" log blocks are allocated
1969 * on the device to be removed. These blocks could be
1970 * written at any time, including while we are in the middle
1973 error
= spa_reset_logs(spa
);
1975 *txg
= spa_vdev_config_enter(spa
);
1978 * Things might have changed while the config lock was dropped
1979 * (e.g. space usage). Check for errors again.
1982 error
= spa_vdev_remove_top_check(vd
);
1985 metaslab_group_activate(mg
);
1989 vd
->vdev_removing
= B_TRUE
;
1991 vdev_dirty_leaves(vd
, VDD_DTL
, *txg
);
1992 vdev_config_dirty(vd
);
1993 dmu_tx_t
*tx
= dmu_tx_create_assigned(spa
->spa_dsl_pool
, *txg
);
1994 dsl_sync_task_nowait(spa
->spa_dsl_pool
,
1995 vdev_remove_initiate_sync
,
1996 (void *)(uintptr_t)vd
->vdev_id
, 0, ZFS_SPACE_CHECK_NONE
, tx
);
2003 * Remove a device from the pool.
2005 * Removing a device from the vdev namespace requires several steps
2006 * and can take a significant amount of time. As a result we use
2007 * the spa_vdev_config_[enter/exit] functions which allow us to
2008 * grab and release the spa_config_lock while still holding the namespace
2009 * lock. During each step the configuration is synced out.
2012 spa_vdev_remove(spa_t
*spa
, uint64_t guid
, boolean_t unspare
)
2015 nvlist_t
**spares
, **l2cache
, *nv
;
2017 uint_t nspares
, nl2cache
;
2019 boolean_t locked
= MUTEX_HELD(&spa_namespace_lock
);
2020 sysevent_t
*ev
= NULL
;
2022 ASSERT(spa_writeable(spa
));
2025 txg
= spa_vdev_enter(spa
);
2027 ASSERT(MUTEX_HELD(&spa_namespace_lock
));
2028 if (spa_feature_is_active(spa
, SPA_FEATURE_POOL_CHECKPOINT
)) {
2029 error
= (spa_has_checkpoint(spa
)) ?
2030 ZFS_ERR_CHECKPOINT_EXISTS
: ZFS_ERR_DISCARDING_CHECKPOINT
;
2033 return (spa_vdev_exit(spa
, NULL
, txg
, error
));
2038 vd
= spa_lookup_by_guid(spa
, guid
, B_FALSE
);
2040 if (spa
->spa_spares
.sav_vdevs
!= NULL
&&
2041 nvlist_lookup_nvlist_array(spa
->spa_spares
.sav_config
,
2042 ZPOOL_CONFIG_SPARES
, &spares
, &nspares
) == 0 &&
2043 (nv
= spa_nvlist_lookup_by_guid(spares
, nspares
, guid
)) != NULL
) {
2045 * Only remove the hot spare if it's not currently in use
2048 if (vd
== NULL
|| unspare
) {
2050 vd
= spa_lookup_by_guid(spa
, guid
, B_TRUE
);
2051 ev
= spa_event_create(spa
, vd
, NULL
,
2052 ESC_ZFS_VDEV_REMOVE_AUX
);
2054 char *nvstr
= fnvlist_lookup_string(nv
,
2056 spa_history_log_internal(spa
, "vdev remove", NULL
,
2057 "%s vdev (%s) %s", spa_name(spa
),
2058 VDEV_TYPE_SPARE
, nvstr
);
2059 spa_vdev_remove_aux(spa
->spa_spares
.sav_config
,
2060 ZPOOL_CONFIG_SPARES
, spares
, nspares
, nv
);
2061 spa_load_spares(spa
);
2062 spa
->spa_spares
.sav_sync
= B_TRUE
;
2064 error
= SET_ERROR(EBUSY
);
2066 } else if (spa
->spa_l2cache
.sav_vdevs
!= NULL
&&
2067 nvlist_lookup_nvlist_array(spa
->spa_l2cache
.sav_config
,
2068 ZPOOL_CONFIG_L2CACHE
, &l2cache
, &nl2cache
) == 0 &&
2069 (nv
= spa_nvlist_lookup_by_guid(l2cache
, nl2cache
, guid
)) != NULL
) {
2070 char *nvstr
= fnvlist_lookup_string(nv
, ZPOOL_CONFIG_PATH
);
2071 spa_history_log_internal(spa
, "vdev remove", NULL
,
2072 "%s vdev (%s) %s", spa_name(spa
), VDEV_TYPE_L2CACHE
, nvstr
);
2074 * Cache devices can always be removed.
2076 vd
= spa_lookup_by_guid(spa
, guid
, B_TRUE
);
2077 ev
= spa_event_create(spa
, vd
, NULL
, ESC_ZFS_VDEV_REMOVE_AUX
);
2078 spa_vdev_remove_aux(spa
->spa_l2cache
.sav_config
,
2079 ZPOOL_CONFIG_L2CACHE
, l2cache
, nl2cache
, nv
);
2080 spa_load_l2cache(spa
);
2081 spa
->spa_l2cache
.sav_sync
= B_TRUE
;
2082 } else if (vd
!= NULL
&& vd
->vdev_islog
) {
2084 error
= spa_vdev_remove_log(vd
, &txg
);
2085 } else if (vd
!= NULL
) {
2087 error
= spa_vdev_remove_top(vd
, &txg
);
2090 * There is no vdev of any kind with the specified guid.
2092 error
= SET_ERROR(ENOENT
);
2096 error
= spa_vdev_exit(spa
, NULL
, txg
, error
);
2105 spa_removal_get_stats(spa_t
*spa
, pool_removal_stat_t
*prs
)
2107 prs
->prs_state
= spa
->spa_removing_phys
.sr_state
;
2109 if (prs
->prs_state
== DSS_NONE
)
2110 return (SET_ERROR(ENOENT
));
2112 prs
->prs_removing_vdev
= spa
->spa_removing_phys
.sr_removing_vdev
;
2113 prs
->prs_start_time
= spa
->spa_removing_phys
.sr_start_time
;
2114 prs
->prs_end_time
= spa
->spa_removing_phys
.sr_end_time
;
2115 prs
->prs_to_copy
= spa
->spa_removing_phys
.sr_to_copy
;
2116 prs
->prs_copied
= spa
->spa_removing_phys
.sr_copied
;
2118 if (spa
->spa_vdev_removal
!= NULL
) {
2119 for (int i
= 0; i
< TXG_SIZE
; i
++) {
2121 spa
->spa_vdev_removal
->svr_bytes_done
[i
];
2125 prs
->prs_mapping_memory
= 0;
2126 uint64_t indirect_vdev_id
=
2127 spa
->spa_removing_phys
.sr_prev_indirect_vdev
;
2128 while (indirect_vdev_id
!= -1) {
2129 vdev_t
*vd
= spa
->spa_root_vdev
->vdev_child
[indirect_vdev_id
];
2130 vdev_indirect_config_t
*vic
= &vd
->vdev_indirect_config
;
2131 vdev_indirect_mapping_t
*vim
= vd
->vdev_indirect_mapping
;
2133 ASSERT3P(vd
->vdev_ops
, ==, &vdev_indirect_ops
);
2134 prs
->prs_mapping_memory
+= vdev_indirect_mapping_size(vim
);
2135 indirect_vdev_id
= vic
->vic_prev_indirect_vdev
;
2141 #if defined(_KERNEL)
2142 module_param(zfs_remove_max_segment
, int, 0644);
2143 MODULE_PARM_DESC(zfs_remove_max_segment
,
2144 "Largest contiguous segment to allocate when removing device");
2146 module_param(vdev_removal_max_span
, int, 0644);
2147 MODULE_PARM_DESC(vdev_removal_max_span
,
2148 "Largest span of free chunks a remap segment can span");
2151 module_param(zfs_remove_max_bytes_pause
, ulong
, 0644);
2152 MODULE_PARM_DESC(zfs_remove_max_bytes_pause
,
2153 "Pause device removal after this many bytes are copied "
2154 "(debug use only - causes removal to hang)");
2157 EXPORT_SYMBOL(free_from_removing_vdev
);
2158 EXPORT_SYMBOL(spa_removal_get_stats
);
2159 EXPORT_SYMBOL(spa_remove_init
);
2160 EXPORT_SYMBOL(spa_restart_removal
);
2161 EXPORT_SYMBOL(spa_vdev_removal_destroy
);
2162 EXPORT_SYMBOL(spa_vdev_remove
);
2163 EXPORT_SYMBOL(spa_vdev_remove_cancel
);
2164 EXPORT_SYMBOL(spa_vdev_remove_suspend
);
2165 EXPORT_SYMBOL(svr_sync
);