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]
22 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
23 * Copyright (c) 2013 by Delphix. All rights reserved.
24 * Copyright (c) 2013 Steven Hartland. All rights reserved.
27 #include <sys/zfs_context.h>
28 #include <sys/dsl_userhold.h>
29 #include <sys/dsl_dataset.h>
30 #include <sys/dsl_synctask.h>
31 #include <sys/dmu_tx.h>
32 #include <sys/dsl_pool.h>
33 #include <sys/dsl_dir.h>
34 #include <sys/dmu_traverse.h>
35 #include <sys/dsl_scan.h>
36 #include <sys/dmu_objset.h>
38 #include <sys/zfeature.h>
39 #include <sys/zfs_ioctl.h>
40 #include <sys/dsl_deleg.h>
41 #include <sys/dmu_impl.h>
43 typedef struct dmu_snapshots_destroy_arg
{
45 nvlist_t
*dsda_successful_snaps
;
47 nvlist_t
*dsda_errlist
;
48 } dmu_snapshots_destroy_arg_t
;
51 dsl_destroy_snapshot_check_impl(dsl_dataset_t
*ds
, boolean_t defer
)
53 if (!dsl_dataset_is_snapshot(ds
))
54 return (SET_ERROR(EINVAL
));
56 if (dsl_dataset_long_held(ds
))
57 return (SET_ERROR(EBUSY
));
60 * Only allow deferred destroy on pools that support it.
61 * NOTE: deferred destroy is only supported on snapshots.
64 if (spa_version(ds
->ds_dir
->dd_pool
->dp_spa
) <
66 return (SET_ERROR(ENOTSUP
));
71 * If this snapshot has an elevated user reference count,
72 * we can't destroy it yet.
74 if (ds
->ds_userrefs
> 0)
75 return (SET_ERROR(EBUSY
));
78 * Can't delete a branch point.
80 if (ds
->ds_phys
->ds_num_children
> 1)
81 return (SET_ERROR(EEXIST
));
87 dsl_destroy_snapshot_check(void *arg
, dmu_tx_t
*tx
)
89 dmu_snapshots_destroy_arg_t
*dsda
= arg
;
90 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
94 if (!dmu_tx_is_syncing(tx
))
97 for (pair
= nvlist_next_nvpair(dsda
->dsda_snaps
, NULL
);
98 pair
!= NULL
; pair
= nvlist_next_nvpair(dsda
->dsda_snaps
, pair
)) {
101 error
= dsl_dataset_hold(dp
, nvpair_name(pair
),
105 * If the snapshot does not exist, silently ignore it
106 * (it's "already destroyed").
112 error
= dsl_destroy_snapshot_check_impl(ds
,
114 dsl_dataset_rele(ds
, FTAG
);
118 fnvlist_add_boolean(dsda
->dsda_successful_snaps
,
121 fnvlist_add_int32(dsda
->dsda_errlist
,
122 nvpair_name(pair
), error
);
126 pair
= nvlist_next_nvpair(dsda
->dsda_errlist
, NULL
);
128 return (fnvpair_value_int32(pair
));
133 struct process_old_arg
{
135 dsl_dataset_t
*ds_prev
;
136 boolean_t after_branch_point
;
138 uint64_t used
, comp
, uncomp
;
142 process_old_cb(void *arg
, const blkptr_t
*bp
, dmu_tx_t
*tx
)
144 struct process_old_arg
*poa
= arg
;
145 dsl_pool_t
*dp
= poa
->ds
->ds_dir
->dd_pool
;
147 if (bp
->blk_birth
<= poa
->ds
->ds_phys
->ds_prev_snap_txg
) {
148 dsl_deadlist_insert(&poa
->ds
->ds_deadlist
, bp
, tx
);
149 if (poa
->ds_prev
&& !poa
->after_branch_point
&&
151 poa
->ds_prev
->ds_phys
->ds_prev_snap_txg
) {
152 poa
->ds_prev
->ds_phys
->ds_unique_bytes
+=
153 bp_get_dsize_sync(dp
->dp_spa
, bp
);
156 poa
->used
+= bp_get_dsize_sync(dp
->dp_spa
, bp
);
157 poa
->comp
+= BP_GET_PSIZE(bp
);
158 poa
->uncomp
+= BP_GET_UCSIZE(bp
);
159 dsl_free_sync(poa
->pio
, dp
, tx
->tx_txg
, bp
);
165 process_old_deadlist(dsl_dataset_t
*ds
, dsl_dataset_t
*ds_prev
,
166 dsl_dataset_t
*ds_next
, boolean_t after_branch_point
, dmu_tx_t
*tx
)
168 struct process_old_arg poa
= { 0 };
169 dsl_pool_t
*dp
= ds
->ds_dir
->dd_pool
;
170 objset_t
*mos
= dp
->dp_meta_objset
;
171 uint64_t deadlist_obj
;
173 ASSERT(ds
->ds_deadlist
.dl_oldfmt
);
174 ASSERT(ds_next
->ds_deadlist
.dl_oldfmt
);
177 poa
.ds_prev
= ds_prev
;
178 poa
.after_branch_point
= after_branch_point
;
179 poa
.pio
= zio_root(dp
->dp_spa
, NULL
, NULL
, ZIO_FLAG_MUSTSUCCEED
);
180 VERIFY0(bpobj_iterate(&ds_next
->ds_deadlist
.dl_bpobj
,
181 process_old_cb
, &poa
, tx
));
182 VERIFY0(zio_wait(poa
.pio
));
183 ASSERT3U(poa
.used
, ==, ds
->ds_phys
->ds_unique_bytes
);
185 /* change snapused */
186 dsl_dir_diduse_space(ds
->ds_dir
, DD_USED_SNAP
,
187 -poa
.used
, -poa
.comp
, -poa
.uncomp
, tx
);
189 /* swap next's deadlist to our deadlist */
190 dsl_deadlist_close(&ds
->ds_deadlist
);
191 dsl_deadlist_close(&ds_next
->ds_deadlist
);
192 deadlist_obj
= ds
->ds_phys
->ds_deadlist_obj
;
193 ds
->ds_phys
->ds_deadlist_obj
= ds_next
->ds_phys
->ds_deadlist_obj
;
194 ds_next
->ds_phys
->ds_deadlist_obj
= deadlist_obj
;
195 dsl_deadlist_open(&ds
->ds_deadlist
, mos
, ds
->ds_phys
->ds_deadlist_obj
);
196 dsl_deadlist_open(&ds_next
->ds_deadlist
, mos
,
197 ds_next
->ds_phys
->ds_deadlist_obj
);
201 dsl_dataset_remove_clones_key(dsl_dataset_t
*ds
, uint64_t mintxg
, dmu_tx_t
*tx
)
203 objset_t
*mos
= ds
->ds_dir
->dd_pool
->dp_meta_objset
;
208 * If it is the old version, dd_clones doesn't exist so we can't
209 * find the clones, but dsl_deadlist_remove_key() is a no-op so it
212 if (ds
->ds_dir
->dd_phys
->dd_clones
== 0)
215 zc
= kmem_alloc(sizeof (zap_cursor_t
), KM_PUSHPAGE
);
216 za
= kmem_alloc(sizeof (zap_attribute_t
), KM_PUSHPAGE
);
218 for (zap_cursor_init(zc
, mos
, ds
->ds_dir
->dd_phys
->dd_clones
);
219 zap_cursor_retrieve(zc
, za
) == 0;
220 zap_cursor_advance(zc
)) {
221 dsl_dataset_t
*clone
;
223 VERIFY0(dsl_dataset_hold_obj(ds
->ds_dir
->dd_pool
,
224 za
->za_first_integer
, FTAG
, &clone
));
225 if (clone
->ds_dir
->dd_origin_txg
> mintxg
) {
226 dsl_deadlist_remove_key(&clone
->ds_deadlist
,
228 dsl_dataset_remove_clones_key(clone
, mintxg
, tx
);
230 dsl_dataset_rele(clone
, FTAG
);
234 kmem_free(za
, sizeof (zap_attribute_t
));
235 kmem_free(zc
, sizeof (zap_cursor_t
));
239 dsl_destroy_snapshot_sync_impl(dsl_dataset_t
*ds
, boolean_t defer
, dmu_tx_t
*tx
)
244 int after_branch_point
= FALSE
;
245 dsl_pool_t
*dp
= ds
->ds_dir
->dd_pool
;
246 objset_t
*mos
= dp
->dp_meta_objset
;
247 dsl_dataset_t
*ds_prev
= NULL
;
248 uint64_t obj
, old_unique
, used
= 0, comp
= 0, uncomp
= 0;
249 dsl_dataset_t
*ds_next
, *ds_head
, *hds
;
252 ASSERT(RRW_WRITE_HELD(&dp
->dp_config_rwlock
));
253 ASSERT3U(ds
->ds_phys
->ds_bp
.blk_birth
, <=, tx
->tx_txg
);
254 ASSERT(refcount_is_zero(&ds
->ds_longholds
));
257 (ds
->ds_userrefs
> 0 || ds
->ds_phys
->ds_num_children
> 1)) {
258 ASSERT(spa_version(dp
->dp_spa
) >= SPA_VERSION_USERREFS
);
259 dmu_buf_will_dirty(ds
->ds_dbuf
, tx
);
260 ds
->ds_phys
->ds_flags
|= DS_FLAG_DEFER_DESTROY
;
261 spa_history_log_internal_ds(ds
, "defer_destroy", tx
, "");
265 ASSERT3U(ds
->ds_phys
->ds_num_children
, <=, 1);
267 /* We need to log before removing it from the namespace. */
268 spa_history_log_internal_ds(ds
, "destroy", tx
, "");
270 dsl_scan_ds_destroyed(ds
, tx
);
274 if (ds
->ds_phys
->ds_prev_snap_obj
!= 0) {
275 ASSERT3P(ds
->ds_prev
, ==, NULL
);
276 VERIFY0(dsl_dataset_hold_obj(dp
,
277 ds
->ds_phys
->ds_prev_snap_obj
, FTAG
, &ds_prev
));
279 (ds_prev
->ds_phys
->ds_next_snap_obj
!= obj
);
281 dmu_buf_will_dirty(ds_prev
->ds_dbuf
, tx
);
282 if (after_branch_point
&&
283 ds_prev
->ds_phys
->ds_next_clones_obj
!= 0) {
284 dsl_dataset_remove_from_next_clones(ds_prev
, obj
, tx
);
285 if (ds
->ds_phys
->ds_next_snap_obj
!= 0) {
286 VERIFY0(zap_add_int(mos
,
287 ds_prev
->ds_phys
->ds_next_clones_obj
,
288 ds
->ds_phys
->ds_next_snap_obj
, tx
));
291 if (!after_branch_point
) {
292 ds_prev
->ds_phys
->ds_next_snap_obj
=
293 ds
->ds_phys
->ds_next_snap_obj
;
297 VERIFY0(dsl_dataset_hold_obj(dp
,
298 ds
->ds_phys
->ds_next_snap_obj
, FTAG
, &ds_next
));
299 ASSERT3U(ds_next
->ds_phys
->ds_prev_snap_obj
, ==, obj
);
301 old_unique
= ds_next
->ds_phys
->ds_unique_bytes
;
303 dmu_buf_will_dirty(ds_next
->ds_dbuf
, tx
);
304 ds_next
->ds_phys
->ds_prev_snap_obj
=
305 ds
->ds_phys
->ds_prev_snap_obj
;
306 ds_next
->ds_phys
->ds_prev_snap_txg
=
307 ds
->ds_phys
->ds_prev_snap_txg
;
308 ASSERT3U(ds
->ds_phys
->ds_prev_snap_txg
, ==,
309 ds_prev
? ds_prev
->ds_phys
->ds_creation_txg
: 0);
311 if (ds_next
->ds_deadlist
.dl_oldfmt
) {
312 process_old_deadlist(ds
, ds_prev
, ds_next
,
313 after_branch_point
, tx
);
315 /* Adjust prev's unique space. */
316 if (ds_prev
&& !after_branch_point
) {
317 dsl_deadlist_space_range(&ds_next
->ds_deadlist
,
318 ds_prev
->ds_phys
->ds_prev_snap_txg
,
319 ds
->ds_phys
->ds_prev_snap_txg
,
320 &used
, &comp
, &uncomp
);
321 ds_prev
->ds_phys
->ds_unique_bytes
+= used
;
324 /* Adjust snapused. */
325 dsl_deadlist_space_range(&ds_next
->ds_deadlist
,
326 ds
->ds_phys
->ds_prev_snap_txg
, UINT64_MAX
,
327 &used
, &comp
, &uncomp
);
328 dsl_dir_diduse_space(ds
->ds_dir
, DD_USED_SNAP
,
329 -used
, -comp
, -uncomp
, tx
);
331 /* Move blocks to be freed to pool's free list. */
332 dsl_deadlist_move_bpobj(&ds_next
->ds_deadlist
,
333 &dp
->dp_free_bpobj
, ds
->ds_phys
->ds_prev_snap_txg
,
335 dsl_dir_diduse_space(tx
->tx_pool
->dp_free_dir
,
336 DD_USED_HEAD
, used
, comp
, uncomp
, tx
);
338 /* Merge our deadlist into next's and free it. */
339 dsl_deadlist_merge(&ds_next
->ds_deadlist
,
340 ds
->ds_phys
->ds_deadlist_obj
, tx
);
342 dsl_deadlist_close(&ds
->ds_deadlist
);
343 dsl_deadlist_free(mos
, ds
->ds_phys
->ds_deadlist_obj
, tx
);
344 dmu_buf_will_dirty(ds
->ds_dbuf
, tx
);
345 ds
->ds_phys
->ds_deadlist_obj
= 0;
347 /* Collapse range in clone heads */
348 dsl_dataset_remove_clones_key(ds
,
349 ds
->ds_phys
->ds_creation_txg
, tx
);
351 if (dsl_dataset_is_snapshot(ds_next
)) {
352 dsl_dataset_t
*ds_nextnext
;
355 * Update next's unique to include blocks which
356 * were previously shared by only this snapshot
357 * and it. Those blocks will be born after the
358 * prev snap and before this snap, and will have
359 * died after the next snap and before the one
360 * after that (ie. be on the snap after next's
363 VERIFY0(dsl_dataset_hold_obj(dp
,
364 ds_next
->ds_phys
->ds_next_snap_obj
, FTAG
, &ds_nextnext
));
365 dsl_deadlist_space_range(&ds_nextnext
->ds_deadlist
,
366 ds
->ds_phys
->ds_prev_snap_txg
,
367 ds
->ds_phys
->ds_creation_txg
,
368 &used
, &comp
, &uncomp
);
369 ds_next
->ds_phys
->ds_unique_bytes
+= used
;
370 dsl_dataset_rele(ds_nextnext
, FTAG
);
371 ASSERT3P(ds_next
->ds_prev
, ==, NULL
);
373 /* Collapse range in this head. */
374 VERIFY0(dsl_dataset_hold_obj(dp
,
375 ds
->ds_dir
->dd_phys
->dd_head_dataset_obj
, FTAG
, &hds
));
376 dsl_deadlist_remove_key(&hds
->ds_deadlist
,
377 ds
->ds_phys
->ds_creation_txg
, tx
);
378 dsl_dataset_rele(hds
, FTAG
);
381 ASSERT3P(ds_next
->ds_prev
, ==, ds
);
382 dsl_dataset_rele(ds_next
->ds_prev
, ds_next
);
383 ds_next
->ds_prev
= NULL
;
385 VERIFY0(dsl_dataset_hold_obj(dp
,
386 ds
->ds_phys
->ds_prev_snap_obj
,
387 ds_next
, &ds_next
->ds_prev
));
390 dsl_dataset_recalc_head_uniq(ds_next
);
393 * Reduce the amount of our unconsumed refreservation
394 * being charged to our parent by the amount of
395 * new unique data we have gained.
397 if (old_unique
< ds_next
->ds_reserved
) {
399 uint64_t new_unique
=
400 ds_next
->ds_phys
->ds_unique_bytes
;
402 ASSERT(old_unique
<= new_unique
);
403 mrsdelta
= MIN(new_unique
- old_unique
,
404 ds_next
->ds_reserved
- old_unique
);
405 dsl_dir_diduse_space(ds
->ds_dir
,
406 DD_USED_REFRSRV
, -mrsdelta
, 0, 0, tx
);
409 dsl_dataset_rele(ds_next
, FTAG
);
412 * This must be done after the dsl_traverse(), because it will
413 * re-open the objset.
416 dmu_objset_evict(ds
->ds_objset
);
417 ds
->ds_objset
= NULL
;
420 /* remove from snapshot namespace */
421 ASSERT(ds
->ds_phys
->ds_snapnames_zapobj
== 0);
422 VERIFY0(dsl_dataset_hold_obj(dp
,
423 ds
->ds_dir
->dd_phys
->dd_head_dataset_obj
, FTAG
, &ds_head
));
424 VERIFY0(dsl_dataset_get_snapname(ds
));
429 err
= dsl_dataset_snap_lookup(ds_head
,
430 ds
->ds_snapname
, &val
);
432 ASSERT3U(val
, ==, obj
);
435 VERIFY0(dsl_dataset_snap_remove(ds_head
, ds
->ds_snapname
, tx
));
436 dsl_dataset_rele(ds_head
, FTAG
);
439 dsl_dataset_rele(ds_prev
, FTAG
);
441 spa_prop_clear_bootfs(dp
->dp_spa
, ds
->ds_object
, tx
);
443 if (ds
->ds_phys
->ds_next_clones_obj
!= 0) {
444 ASSERTV(uint64_t count
);
445 ASSERT0(zap_count(mos
,
446 ds
->ds_phys
->ds_next_clones_obj
, &count
) && count
== 0);
447 VERIFY0(dmu_object_free(mos
,
448 ds
->ds_phys
->ds_next_clones_obj
, tx
));
450 if (ds
->ds_phys
->ds_props_obj
!= 0)
451 VERIFY0(zap_destroy(mos
, ds
->ds_phys
->ds_props_obj
, tx
));
452 if (ds
->ds_phys
->ds_userrefs_obj
!= 0)
453 VERIFY0(zap_destroy(mos
, ds
->ds_phys
->ds_userrefs_obj
, tx
));
454 dsl_dir_rele(ds
->ds_dir
, ds
);
456 dmu_object_free_zapified(mos
, obj
, tx
);
460 dsl_destroy_snapshot_sync(void *arg
, dmu_tx_t
*tx
)
462 dmu_snapshots_destroy_arg_t
*dsda
= arg
;
463 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
466 for (pair
= nvlist_next_nvpair(dsda
->dsda_successful_snaps
, NULL
);
468 pair
= nvlist_next_nvpair(dsda
->dsda_successful_snaps
, pair
)) {
471 VERIFY0(dsl_dataset_hold(dp
, nvpair_name(pair
), FTAG
, &ds
));
473 dsl_destroy_snapshot_sync_impl(ds
, dsda
->dsda_defer
, tx
);
474 dsl_dataset_rele(ds
, FTAG
);
479 * The semantics of this function are described in the comment above
480 * lzc_destroy_snaps(). To summarize:
482 * The snapshots must all be in the same pool.
484 * Snapshots that don't exist will be silently ignored (considered to be
485 * "already deleted").
487 * On success, all snaps will be destroyed and this will return 0.
488 * On failure, no snaps will be destroyed, the errlist will be filled in,
489 * and this will return an errno.
492 dsl_destroy_snapshots_nvl(nvlist_t
*snaps
, boolean_t defer
,
495 dmu_snapshots_destroy_arg_t dsda
;
499 pair
= nvlist_next_nvpair(snaps
, NULL
);
503 dsda
.dsda_snaps
= snaps
;
504 VERIFY0(nvlist_alloc(&dsda
.dsda_successful_snaps
,
505 NV_UNIQUE_NAME
, KM_PUSHPAGE
));
506 dsda
.dsda_defer
= defer
;
507 dsda
.dsda_errlist
= errlist
;
509 error
= dsl_sync_task(nvpair_name(pair
),
510 dsl_destroy_snapshot_check
, dsl_destroy_snapshot_sync
,
512 fnvlist_free(dsda
.dsda_successful_snaps
);
518 dsl_destroy_snapshot(const char *name
, boolean_t defer
)
524 VERIFY0(nvlist_alloc(&nvl
, NV_UNIQUE_NAME
, KM_PUSHPAGE
));
525 VERIFY0(nvlist_alloc(&errlist
, NV_UNIQUE_NAME
, KM_PUSHPAGE
));
527 fnvlist_add_boolean(nvl
, name
);
528 error
= dsl_destroy_snapshots_nvl(nvl
, defer
, errlist
);
529 fnvlist_free(errlist
);
541 kill_blkptr(spa_t
*spa
, zilog_t
*zilog
, const blkptr_t
*bp
,
542 const zbookmark_t
*zb
, const dnode_phys_t
*dnp
, void *arg
)
544 struct killarg
*ka
= arg
;
545 dmu_tx_t
*tx
= ka
->tx
;
550 if (zb
->zb_level
== ZB_ZIL_LEVEL
) {
551 ASSERT(zilog
!= NULL
);
553 * It's a block in the intent log. It has no
554 * accounting, so just free it.
556 dsl_free(ka
->tx
->tx_pool
, ka
->tx
->tx_txg
, bp
);
558 ASSERT(zilog
== NULL
);
559 ASSERT3U(bp
->blk_birth
, >, ka
->ds
->ds_phys
->ds_prev_snap_txg
);
560 (void) dsl_dataset_block_kill(ka
->ds
, bp
, tx
, B_FALSE
);
567 old_synchronous_dataset_destroy(dsl_dataset_t
*ds
, dmu_tx_t
*tx
)
572 * Free everything that we point to (that's born after
573 * the previous snapshot, if we are a clone)
575 * NB: this should be very quick, because we already
576 * freed all the objects in open context.
580 VERIFY0(traverse_dataset(ds
,
581 ds
->ds_phys
->ds_prev_snap_txg
, TRAVERSE_POST
,
583 ASSERT(!DS_UNIQUE_IS_ACCURATE(ds
) || ds
->ds_phys
->ds_unique_bytes
== 0);
586 typedef struct dsl_destroy_head_arg
{
587 const char *ddha_name
;
588 } dsl_destroy_head_arg_t
;
591 dsl_destroy_head_check_impl(dsl_dataset_t
*ds
, int expected_holds
)
597 if (dsl_dataset_is_snapshot(ds
))
598 return (SET_ERROR(EINVAL
));
600 if (refcount_count(&ds
->ds_longholds
) != expected_holds
)
601 return (SET_ERROR(EBUSY
));
603 mos
= ds
->ds_dir
->dd_pool
->dp_meta_objset
;
606 * Can't delete a head dataset if there are snapshots of it.
607 * (Except if the only snapshots are from the branch we cloned
610 if (ds
->ds_prev
!= NULL
&&
611 ds
->ds_prev
->ds_phys
->ds_next_snap_obj
== ds
->ds_object
)
612 return (SET_ERROR(EBUSY
));
615 * Can't delete if there are children of this fs.
617 error
= zap_count(mos
,
618 ds
->ds_dir
->dd_phys
->dd_child_dir_zapobj
, &count
);
622 return (SET_ERROR(EEXIST
));
624 if (dsl_dir_is_clone(ds
->ds_dir
) && DS_IS_DEFER_DESTROY(ds
->ds_prev
) &&
625 ds
->ds_prev
->ds_phys
->ds_num_children
== 2 &&
626 ds
->ds_prev
->ds_userrefs
== 0) {
627 /* We need to remove the origin snapshot as well. */
628 if (!refcount_is_zero(&ds
->ds_prev
->ds_longholds
))
629 return (SET_ERROR(EBUSY
));
635 dsl_destroy_head_check(void *arg
, dmu_tx_t
*tx
)
637 dsl_destroy_head_arg_t
*ddha
= arg
;
638 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
642 error
= dsl_dataset_hold(dp
, ddha
->ddha_name
, FTAG
, &ds
);
646 error
= dsl_destroy_head_check_impl(ds
, 0);
647 dsl_dataset_rele(ds
, FTAG
);
652 dsl_dir_destroy_sync(uint64_t ddobj
, dmu_tx_t
*tx
)
655 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
656 objset_t
*mos
= dp
->dp_meta_objset
;
659 ASSERT(RRW_WRITE_HELD(&dmu_tx_pool(tx
)->dp_config_rwlock
));
661 VERIFY0(dsl_dir_hold_obj(dp
, ddobj
, NULL
, FTAG
, &dd
));
663 ASSERT0(dd
->dd_phys
->dd_head_dataset_obj
);
666 * Remove our reservation. The impl() routine avoids setting the
667 * actual property, which would require the (already destroyed) ds.
669 dsl_dir_set_reservation_sync_impl(dd
, 0, tx
);
671 ASSERT0(dd
->dd_phys
->dd_used_bytes
);
672 ASSERT0(dd
->dd_phys
->dd_reserved
);
673 for (t
= 0; t
< DD_USED_NUM
; t
++)
674 ASSERT0(dd
->dd_phys
->dd_used_breakdown
[t
]);
676 VERIFY0(zap_destroy(mos
, dd
->dd_phys
->dd_child_dir_zapobj
, tx
));
677 VERIFY0(zap_destroy(mos
, dd
->dd_phys
->dd_props_zapobj
, tx
));
678 VERIFY0(dsl_deleg_destroy(mos
, dd
->dd_phys
->dd_deleg_zapobj
, tx
));
679 VERIFY0(zap_remove(mos
,
680 dd
->dd_parent
->dd_phys
->dd_child_dir_zapobj
, dd
->dd_myname
, tx
));
682 dsl_dir_rele(dd
, FTAG
);
683 dmu_object_free_zapified(mos
, ddobj
, tx
);
687 dsl_destroy_head_sync_impl(dsl_dataset_t
*ds
, dmu_tx_t
*tx
)
689 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
690 objset_t
*mos
= dp
->dp_meta_objset
;
691 uint64_t obj
, ddobj
, prevobj
= 0;
695 ASSERT3U(ds
->ds_phys
->ds_num_children
, <=, 1);
696 ASSERT(ds
->ds_prev
== NULL
||
697 ds
->ds_prev
->ds_phys
->ds_next_snap_obj
!= ds
->ds_object
);
698 ASSERT3U(ds
->ds_phys
->ds_bp
.blk_birth
, <=, tx
->tx_txg
);
699 ASSERT(RRW_WRITE_HELD(&dp
->dp_config_rwlock
));
701 /* We need to log before removing it from the namespace. */
702 spa_history_log_internal_ds(ds
, "destroy", tx
, "");
704 rmorigin
= (dsl_dir_is_clone(ds
->ds_dir
) &&
705 DS_IS_DEFER_DESTROY(ds
->ds_prev
) &&
706 ds
->ds_prev
->ds_phys
->ds_num_children
== 2 &&
707 ds
->ds_prev
->ds_userrefs
== 0);
709 /* Remove our reservation */
710 if (ds
->ds_reserved
!= 0) {
711 dsl_dataset_set_refreservation_sync_impl(ds
,
712 (ZPROP_SRC_NONE
| ZPROP_SRC_LOCAL
| ZPROP_SRC_RECEIVED
),
714 ASSERT0(ds
->ds_reserved
);
717 dsl_scan_ds_destroyed(ds
, tx
);
721 if (ds
->ds_phys
->ds_prev_snap_obj
!= 0) {
722 /* This is a clone */
723 ASSERT(ds
->ds_prev
!= NULL
);
724 ASSERT3U(ds
->ds_prev
->ds_phys
->ds_next_snap_obj
, !=, obj
);
725 ASSERT0(ds
->ds_phys
->ds_next_snap_obj
);
727 dmu_buf_will_dirty(ds
->ds_prev
->ds_dbuf
, tx
);
728 if (ds
->ds_prev
->ds_phys
->ds_next_clones_obj
!= 0) {
729 dsl_dataset_remove_from_next_clones(ds
->ds_prev
,
733 ASSERT3U(ds
->ds_prev
->ds_phys
->ds_num_children
, >, 1);
734 ds
->ds_prev
->ds_phys
->ds_num_children
--;
738 * Destroy the deadlist. Unless it's a clone, the
739 * deadlist should be empty. (If it's a clone, it's
740 * safe to ignore the deadlist contents.)
742 dsl_deadlist_close(&ds
->ds_deadlist
);
743 dsl_deadlist_free(mos
, ds
->ds_phys
->ds_deadlist_obj
, tx
);
744 dmu_buf_will_dirty(ds
->ds_dbuf
, tx
);
745 ds
->ds_phys
->ds_deadlist_obj
= 0;
747 VERIFY0(dmu_objset_from_ds(ds
, &os
));
749 if (!spa_feature_is_enabled(dp
->dp_spa
, SPA_FEATURE_ASYNC_DESTROY
)) {
750 old_synchronous_dataset_destroy(ds
, tx
);
753 * Move the bptree into the pool's list of trees to
754 * clean up and update space accounting information.
756 uint64_t used
, comp
, uncomp
;
758 zil_destroy_sync(dmu_objset_zil(os
), tx
);
760 if (!spa_feature_is_active(dp
->dp_spa
,
761 SPA_FEATURE_ASYNC_DESTROY
)) {
762 dsl_scan_t
*scn
= dp
->dp_scan
;
763 spa_feature_incr(dp
->dp_spa
, SPA_FEATURE_ASYNC_DESTROY
,
765 dp
->dp_bptree_obj
= bptree_alloc(mos
, tx
);
767 DMU_POOL_DIRECTORY_OBJECT
,
768 DMU_POOL_BPTREE_OBJ
, sizeof (uint64_t), 1,
769 &dp
->dp_bptree_obj
, tx
));
770 ASSERT(!scn
->scn_async_destroying
);
771 scn
->scn_async_destroying
= B_TRUE
;
774 used
= ds
->ds_dir
->dd_phys
->dd_used_bytes
;
775 comp
= ds
->ds_dir
->dd_phys
->dd_compressed_bytes
;
776 uncomp
= ds
->ds_dir
->dd_phys
->dd_uncompressed_bytes
;
778 ASSERT(!DS_UNIQUE_IS_ACCURATE(ds
) ||
779 ds
->ds_phys
->ds_unique_bytes
== used
);
781 bptree_add(mos
, dp
->dp_bptree_obj
,
782 &ds
->ds_phys
->ds_bp
, ds
->ds_phys
->ds_prev_snap_txg
,
783 used
, comp
, uncomp
, tx
);
784 dsl_dir_diduse_space(ds
->ds_dir
, DD_USED_HEAD
,
785 -used
, -comp
, -uncomp
, tx
);
786 dsl_dir_diduse_space(dp
->dp_free_dir
, DD_USED_HEAD
,
787 used
, comp
, uncomp
, tx
);
790 if (ds
->ds_prev
!= NULL
) {
791 if (spa_version(dp
->dp_spa
) >= SPA_VERSION_DIR_CLONES
) {
792 VERIFY0(zap_remove_int(mos
,
793 ds
->ds_prev
->ds_dir
->dd_phys
->dd_clones
,
796 prevobj
= ds
->ds_prev
->ds_object
;
797 dsl_dataset_rele(ds
->ds_prev
, ds
);
802 * This must be done after the dsl_traverse(), because it will
803 * re-open the objset.
806 dmu_objset_evict(ds
->ds_objset
);
807 ds
->ds_objset
= NULL
;
810 /* Erase the link in the dir */
811 dmu_buf_will_dirty(ds
->ds_dir
->dd_dbuf
, tx
);
812 ds
->ds_dir
->dd_phys
->dd_head_dataset_obj
= 0;
813 ddobj
= ds
->ds_dir
->dd_object
;
814 ASSERT(ds
->ds_phys
->ds_snapnames_zapobj
!= 0);
815 VERIFY0(zap_destroy(mos
, ds
->ds_phys
->ds_snapnames_zapobj
, tx
));
817 spa_prop_clear_bootfs(dp
->dp_spa
, ds
->ds_object
, tx
);
819 ASSERT0(ds
->ds_phys
->ds_next_clones_obj
);
820 ASSERT0(ds
->ds_phys
->ds_props_obj
);
821 ASSERT0(ds
->ds_phys
->ds_userrefs_obj
);
822 dsl_dir_rele(ds
->ds_dir
, ds
);
824 dmu_object_free_zapified(mos
, obj
, tx
);
826 dsl_dir_destroy_sync(ddobj
, tx
);
830 VERIFY0(dsl_dataset_hold_obj(dp
, prevobj
, FTAG
, &prev
));
831 dsl_destroy_snapshot_sync_impl(prev
, B_FALSE
, tx
);
832 dsl_dataset_rele(prev
, FTAG
);
837 dsl_destroy_head_sync(void *arg
, dmu_tx_t
*tx
)
839 dsl_destroy_head_arg_t
*ddha
= arg
;
840 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
843 VERIFY0(dsl_dataset_hold(dp
, ddha
->ddha_name
, FTAG
, &ds
));
844 dsl_destroy_head_sync_impl(ds
, tx
);
845 dsl_dataset_rele(ds
, FTAG
);
849 dsl_destroy_head_begin_sync(void *arg
, dmu_tx_t
*tx
)
851 dsl_destroy_head_arg_t
*ddha
= arg
;
852 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
855 VERIFY0(dsl_dataset_hold(dp
, ddha
->ddha_name
, FTAG
, &ds
));
857 /* Mark it as inconsistent on-disk, in case we crash */
858 dmu_buf_will_dirty(ds
->ds_dbuf
, tx
);
859 ds
->ds_phys
->ds_flags
|= DS_FLAG_INCONSISTENT
;
861 spa_history_log_internal_ds(ds
, "destroy begin", tx
, "");
862 dsl_dataset_rele(ds
, FTAG
);
866 dsl_destroy_head(const char *name
)
868 dsl_destroy_head_arg_t ddha
;
874 zfs_destroy_unmount_origin(name
);
877 error
= spa_open(name
, &spa
, FTAG
);
880 isenabled
= spa_feature_is_enabled(spa
, SPA_FEATURE_ASYNC_DESTROY
);
881 spa_close(spa
, FTAG
);
883 ddha
.ddha_name
= name
;
888 error
= dsl_sync_task(name
, dsl_destroy_head_check
,
889 dsl_destroy_head_begin_sync
, &ddha
, 0);
894 * Head deletion is processed in one txg on old pools;
895 * remove the objects from open context so that the txg sync
898 error
= dmu_objset_own(name
, DMU_OST_ANY
, B_FALSE
, FTAG
, &os
);
901 uint64_t prev_snap_txg
=
902 dmu_objset_ds(os
)->ds_phys
->ds_prev_snap_txg
;
903 for (obj
= 0; error
== 0;
904 error
= dmu_object_next(os
, &obj
, FALSE
,
906 (void) dmu_free_long_object(os
, obj
);
907 /* sync out all frees */
908 txg_wait_synced(dmu_objset_pool(os
), 0);
909 dmu_objset_disown(os
, FTAG
);
913 return (dsl_sync_task(name
, dsl_destroy_head_check
,
914 dsl_destroy_head_sync
, &ddha
, 0));
918 * Note, this function is used as the callback for dmu_objset_find(). We
919 * always return 0 so that we will continue to find and process
920 * inconsistent datasets, even if we encounter an error trying to
921 * process one of them.
925 dsl_destroy_inconsistent(const char *dsname
, void *arg
)
929 if (dmu_objset_hold(dsname
, FTAG
, &os
) == 0) {
930 boolean_t inconsistent
= DS_IS_INCONSISTENT(dmu_objset_ds(os
));
931 dmu_objset_rele(os
, FTAG
);
933 (void) dsl_destroy_head(dsname
);
939 #if defined(_KERNEL) && defined(HAVE_SPL)
940 EXPORT_SYMBOL(dsl_destroy_head
);
941 EXPORT_SYMBOL(dsl_destroy_head_sync_impl
);
942 EXPORT_SYMBOL(dsl_dataset_user_hold_check_one
);
943 EXPORT_SYMBOL(dsl_destroy_snapshot_sync_impl
);
944 EXPORT_SYMBOL(dsl_destroy_inconsistent
);
945 EXPORT_SYMBOL(dsl_dataset_user_release_tmp
);
946 EXPORT_SYMBOL(dsl_destroy_head_check_impl
);