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.
25 #include <sys/dmu_objset.h>
26 #include <sys/dsl_dataset.h>
27 #include <sys/dsl_dir.h>
28 #include <sys/dsl_prop.h>
29 #include <sys/dsl_synctask.h>
30 #include <sys/dmu_traverse.h>
31 #include <sys/dmu_tx.h>
35 #include <sys/unique.h>
36 #include <sys/zfs_context.h>
37 #include <sys/zfs_ioctl.h>
39 #include <sys/zfs_znode.h>
40 #include <sys/zfs_onexit.h>
42 #include <sys/dsl_scan.h>
43 #include <sys/dsl_deadlist.h>
45 static char *dsl_reaper
= "the grim reaper";
47 static dsl_checkfunc_t dsl_dataset_destroy_begin_check
;
48 static dsl_syncfunc_t dsl_dataset_destroy_begin_sync
;
49 static dsl_syncfunc_t dsl_dataset_set_reservation_sync
;
51 #define SWITCH64(x, y) \
53 uint64_t __tmp = (x); \
58 #define DS_REF_MAX (1ULL << 62)
60 #define DSL_DEADLIST_BLOCKSIZE SPA_MAXBLOCKSIZE
62 #define DSL_DATASET_IS_DESTROYED(ds) ((ds)->ds_owner == dsl_reaper)
66 * Figure out how much of this delta should be propogated to the dsl_dir
67 * layer. If there's a refreservation, that space has already been
68 * partially accounted for in our ancestors.
71 parent_delta(dsl_dataset_t
*ds
, int64_t delta
)
73 uint64_t old_bytes
, new_bytes
;
75 if (ds
->ds_reserved
== 0)
78 old_bytes
= MAX(ds
->ds_phys
->ds_unique_bytes
, ds
->ds_reserved
);
79 new_bytes
= MAX(ds
->ds_phys
->ds_unique_bytes
+ delta
, ds
->ds_reserved
);
81 ASSERT3U(ABS((int64_t)(new_bytes
- old_bytes
)), <=, ABS(delta
));
82 return (new_bytes
- old_bytes
);
86 dsl_dataset_block_born(dsl_dataset_t
*ds
, const blkptr_t
*bp
, dmu_tx_t
*tx
)
88 int used
, compressed
, uncompressed
;
91 used
= bp_get_dsize_sync(tx
->tx_pool
->dp_spa
, bp
);
92 compressed
= BP_GET_PSIZE(bp
);
93 uncompressed
= BP_GET_UCSIZE(bp
);
95 dprintf_bp(bp
, "ds=%p", ds
);
97 ASSERT(dmu_tx_is_syncing(tx
));
98 /* It could have been compressed away to nothing */
101 ASSERT(BP_GET_TYPE(bp
) != DMU_OT_NONE
);
102 ASSERT3U(BP_GET_TYPE(bp
), <, DMU_OT_NUMTYPES
);
105 * Account for the meta-objset space in its placeholder
108 ASSERT3U(compressed
, ==, uncompressed
); /* it's all metadata */
109 dsl_dir_diduse_space(tx
->tx_pool
->dp_mos_dir
, DD_USED_HEAD
,
110 used
, compressed
, uncompressed
, tx
);
111 dsl_dir_dirty(tx
->tx_pool
->dp_mos_dir
, tx
);
114 dmu_buf_will_dirty(ds
->ds_dbuf
, tx
);
116 mutex_enter(&ds
->ds_dir
->dd_lock
);
117 mutex_enter(&ds
->ds_lock
);
118 delta
= parent_delta(ds
, used
);
119 ds
->ds_phys
->ds_used_bytes
+= used
;
120 ds
->ds_phys
->ds_compressed_bytes
+= compressed
;
121 ds
->ds_phys
->ds_uncompressed_bytes
+= uncompressed
;
122 ds
->ds_phys
->ds_unique_bytes
+= used
;
123 mutex_exit(&ds
->ds_lock
);
124 dsl_dir_diduse_space(ds
->ds_dir
, DD_USED_HEAD
, delta
,
125 compressed
, uncompressed
, tx
);
126 dsl_dir_transfer_space(ds
->ds_dir
, used
- delta
,
127 DD_USED_REFRSRV
, DD_USED_HEAD
, tx
);
128 mutex_exit(&ds
->ds_dir
->dd_lock
);
132 dsl_dataset_block_kill(dsl_dataset_t
*ds
, const blkptr_t
*bp
, dmu_tx_t
*tx
,
135 int used
, compressed
, uncompressed
;
140 ASSERT(dmu_tx_is_syncing(tx
));
141 ASSERT(bp
->blk_birth
<= tx
->tx_txg
);
143 used
= bp_get_dsize_sync(tx
->tx_pool
->dp_spa
, bp
);
144 compressed
= BP_GET_PSIZE(bp
);
145 uncompressed
= BP_GET_UCSIZE(bp
);
150 * Account for the meta-objset space in its placeholder
153 dsl_free(tx
->tx_pool
, tx
->tx_txg
, bp
);
155 dsl_dir_diduse_space(tx
->tx_pool
->dp_mos_dir
, DD_USED_HEAD
,
156 -used
, -compressed
, -uncompressed
, tx
);
157 dsl_dir_dirty(tx
->tx_pool
->dp_mos_dir
, tx
);
160 ASSERT3P(tx
->tx_pool
, ==, ds
->ds_dir
->dd_pool
);
162 ASSERT(!dsl_dataset_is_snapshot(ds
));
163 dmu_buf_will_dirty(ds
->ds_dbuf
, tx
);
165 if (bp
->blk_birth
> ds
->ds_phys
->ds_prev_snap_txg
) {
168 dprintf_bp(bp
, "freeing ds=%llu", ds
->ds_object
);
169 dsl_free(tx
->tx_pool
, tx
->tx_txg
, bp
);
171 mutex_enter(&ds
->ds_dir
->dd_lock
);
172 mutex_enter(&ds
->ds_lock
);
173 ASSERT(ds
->ds_phys
->ds_unique_bytes
>= used
||
174 !DS_UNIQUE_IS_ACCURATE(ds
));
175 delta
= parent_delta(ds
, -used
);
176 ds
->ds_phys
->ds_unique_bytes
-= used
;
177 mutex_exit(&ds
->ds_lock
);
178 dsl_dir_diduse_space(ds
->ds_dir
, DD_USED_HEAD
,
179 delta
, -compressed
, -uncompressed
, tx
);
180 dsl_dir_transfer_space(ds
->ds_dir
, -used
- delta
,
181 DD_USED_REFRSRV
, DD_USED_HEAD
, tx
);
182 mutex_exit(&ds
->ds_dir
->dd_lock
);
184 dprintf_bp(bp
, "putting on dead list: %s", "");
187 * We are here as part of zio's write done callback,
188 * which means we're a zio interrupt thread. We can't
189 * call dsl_deadlist_insert() now because it may block
190 * waiting for I/O. Instead, put bp on the deferred
191 * queue and let dsl_pool_sync() finish the job.
193 bplist_append(&ds
->ds_pending_deadlist
, bp
);
195 dsl_deadlist_insert(&ds
->ds_deadlist
, bp
, tx
);
197 ASSERT3U(ds
->ds_prev
->ds_object
, ==,
198 ds
->ds_phys
->ds_prev_snap_obj
);
199 ASSERT(ds
->ds_prev
->ds_phys
->ds_num_children
> 0);
200 /* if (bp->blk_birth > prev prev snap txg) prev unique += bs */
201 if (ds
->ds_prev
->ds_phys
->ds_next_snap_obj
==
202 ds
->ds_object
&& bp
->blk_birth
>
203 ds
->ds_prev
->ds_phys
->ds_prev_snap_txg
) {
204 dmu_buf_will_dirty(ds
->ds_prev
->ds_dbuf
, tx
);
205 mutex_enter(&ds
->ds_prev
->ds_lock
);
206 ds
->ds_prev
->ds_phys
->ds_unique_bytes
+= used
;
207 mutex_exit(&ds
->ds_prev
->ds_lock
);
209 if (bp
->blk_birth
> ds
->ds_dir
->dd_origin_txg
) {
210 dsl_dir_transfer_space(ds
->ds_dir
, used
,
211 DD_USED_HEAD
, DD_USED_SNAP
, tx
);
214 mutex_enter(&ds
->ds_lock
);
215 ASSERT3U(ds
->ds_phys
->ds_used_bytes
, >=, used
);
216 ds
->ds_phys
->ds_used_bytes
-= used
;
217 ASSERT3U(ds
->ds_phys
->ds_compressed_bytes
, >=, compressed
);
218 ds
->ds_phys
->ds_compressed_bytes
-= compressed
;
219 ASSERT3U(ds
->ds_phys
->ds_uncompressed_bytes
, >=, uncompressed
);
220 ds
->ds_phys
->ds_uncompressed_bytes
-= uncompressed
;
221 mutex_exit(&ds
->ds_lock
);
227 dsl_dataset_prev_snap_txg(dsl_dataset_t
*ds
)
229 uint64_t trysnap
= 0;
234 * The snapshot creation could fail, but that would cause an
235 * incorrect FALSE return, which would only result in an
236 * overestimation of the amount of space that an operation would
237 * consume, which is OK.
239 * There's also a small window where we could miss a pending
240 * snapshot, because we could set the sync task in the quiescing
241 * phase. So this should only be used as a guess.
243 if (ds
->ds_trysnap_txg
>
244 spa_last_synced_txg(ds
->ds_dir
->dd_pool
->dp_spa
))
245 trysnap
= ds
->ds_trysnap_txg
;
246 return (MAX(ds
->ds_phys
->ds_prev_snap_txg
, trysnap
));
250 dsl_dataset_block_freeable(dsl_dataset_t
*ds
, const blkptr_t
*bp
,
253 if (blk_birth
<= dsl_dataset_prev_snap_txg(ds
))
256 ddt_prefetch(dsl_dataset_get_spa(ds
), bp
);
263 dsl_dataset_evict(dmu_buf_t
*db
, void *dsv
)
265 dsl_dataset_t
*ds
= dsv
;
267 ASSERT(ds
->ds_owner
== NULL
|| DSL_DATASET_IS_DESTROYED(ds
));
269 unique_remove(ds
->ds_fsid_guid
);
271 if (ds
->ds_objset
!= NULL
)
272 dmu_objset_evict(ds
->ds_objset
);
275 dsl_dataset_drop_ref(ds
->ds_prev
, ds
);
279 bplist_destroy(&ds
->ds_pending_deadlist
);
281 dsl_deadlist_close(&ds
->ds_deadlist
);
283 ASSERT(ds
->ds_deadlist
.dl_dbuf
== NULL
);
284 ASSERT(!ds
->ds_deadlist
.dl_oldfmt
);
287 dsl_dir_close(ds
->ds_dir
, ds
);
289 ASSERT(!list_link_active(&ds
->ds_synced_link
));
291 mutex_destroy(&ds
->ds_lock
);
292 mutex_destroy(&ds
->ds_recvlock
);
293 mutex_destroy(&ds
->ds_opening_lock
);
294 rw_destroy(&ds
->ds_rwlock
);
295 cv_destroy(&ds
->ds_exclusive_cv
);
297 kmem_free(ds
, sizeof (dsl_dataset_t
));
301 dsl_dataset_get_snapname(dsl_dataset_t
*ds
)
303 dsl_dataset_phys_t
*headphys
;
306 dsl_pool_t
*dp
= ds
->ds_dir
->dd_pool
;
307 objset_t
*mos
= dp
->dp_meta_objset
;
309 if (ds
->ds_snapname
[0])
311 if (ds
->ds_phys
->ds_next_snap_obj
== 0)
314 err
= dmu_bonus_hold(mos
, ds
->ds_dir
->dd_phys
->dd_head_dataset_obj
,
318 headphys
= headdbuf
->db_data
;
319 err
= zap_value_search(dp
->dp_meta_objset
,
320 headphys
->ds_snapnames_zapobj
, ds
->ds_object
, 0, ds
->ds_snapname
);
321 dmu_buf_rele(headdbuf
, FTAG
);
326 dsl_dataset_snap_lookup(dsl_dataset_t
*ds
, const char *name
, uint64_t *value
)
328 objset_t
*mos
= ds
->ds_dir
->dd_pool
->dp_meta_objset
;
329 uint64_t snapobj
= ds
->ds_phys
->ds_snapnames_zapobj
;
333 if (ds
->ds_phys
->ds_flags
& DS_FLAG_CI_DATASET
)
338 err
= zap_lookup_norm(mos
, snapobj
, name
, 8, 1,
339 value
, mt
, NULL
, 0, NULL
);
340 if (err
== ENOTSUP
&& mt
== MT_FIRST
)
341 err
= zap_lookup(mos
, snapobj
, name
, 8, 1, value
);
346 dsl_dataset_snap_remove(dsl_dataset_t
*ds
, char *name
, dmu_tx_t
*tx
)
348 objset_t
*mos
= ds
->ds_dir
->dd_pool
->dp_meta_objset
;
349 uint64_t snapobj
= ds
->ds_phys
->ds_snapnames_zapobj
;
353 dsl_dir_snap_cmtime_update(ds
->ds_dir
);
355 if (ds
->ds_phys
->ds_flags
& DS_FLAG_CI_DATASET
)
360 err
= zap_remove_norm(mos
, snapobj
, name
, mt
, tx
);
361 if (err
== ENOTSUP
&& mt
== MT_FIRST
)
362 err
= zap_remove(mos
, snapobj
, name
, tx
);
367 dsl_dataset_get_ref(dsl_pool_t
*dp
, uint64_t dsobj
, void *tag
,
370 objset_t
*mos
= dp
->dp_meta_objset
;
374 dmu_object_info_t doi
;
376 ASSERT(RW_LOCK_HELD(&dp
->dp_config_rwlock
) ||
377 dsl_pool_sync_context(dp
));
379 err
= dmu_bonus_hold(mos
, dsobj
, tag
, &dbuf
);
383 /* Make sure dsobj has the correct object type. */
384 dmu_object_info_from_db(dbuf
, &doi
);
385 if (doi
.doi_type
!= DMU_OT_DSL_DATASET
)
388 ds
= dmu_buf_get_user(dbuf
);
390 dsl_dataset_t
*winner
= NULL
;
392 ds
= kmem_zalloc(sizeof (dsl_dataset_t
), KM_SLEEP
);
394 ds
->ds_object
= dsobj
;
395 ds
->ds_phys
= dbuf
->db_data
;
396 list_link_init(&ds
->ds_synced_link
);
398 mutex_init(&ds
->ds_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
399 mutex_init(&ds
->ds_recvlock
, NULL
, MUTEX_DEFAULT
, NULL
);
400 mutex_init(&ds
->ds_opening_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
401 rw_init(&ds
->ds_rwlock
, NULL
, RW_DEFAULT
, NULL
);
402 cv_init(&ds
->ds_exclusive_cv
, NULL
, CV_DEFAULT
, NULL
);
404 bplist_create(&ds
->ds_pending_deadlist
);
405 dsl_deadlist_open(&ds
->ds_deadlist
,
406 mos
, ds
->ds_phys
->ds_deadlist_obj
);
409 err
= dsl_dir_open_obj(dp
,
410 ds
->ds_phys
->ds_dir_obj
, NULL
, ds
, &ds
->ds_dir
);
413 mutex_destroy(&ds
->ds_lock
);
414 mutex_destroy(&ds
->ds_recvlock
);
415 mutex_destroy(&ds
->ds_opening_lock
);
416 rw_destroy(&ds
->ds_rwlock
);
417 cv_destroy(&ds
->ds_exclusive_cv
);
418 bplist_destroy(&ds
->ds_pending_deadlist
);
419 dsl_deadlist_close(&ds
->ds_deadlist
);
420 kmem_free(ds
, sizeof (dsl_dataset_t
));
421 dmu_buf_rele(dbuf
, tag
);
425 if (!dsl_dataset_is_snapshot(ds
)) {
426 ds
->ds_snapname
[0] = '\0';
427 if (ds
->ds_phys
->ds_prev_snap_obj
) {
428 err
= dsl_dataset_get_ref(dp
,
429 ds
->ds_phys
->ds_prev_snap_obj
,
433 if (zfs_flags
& ZFS_DEBUG_SNAPNAMES
)
434 err
= dsl_dataset_get_snapname(ds
);
435 if (err
== 0 && ds
->ds_phys
->ds_userrefs_obj
!= 0) {
437 ds
->ds_dir
->dd_pool
->dp_meta_objset
,
438 ds
->ds_phys
->ds_userrefs_obj
,
443 if (err
== 0 && !dsl_dataset_is_snapshot(ds
)) {
445 * In sync context, we're called with either no lock
446 * or with the write lock. If we're not syncing,
447 * we're always called with the read lock held.
449 boolean_t need_lock
=
450 !RW_WRITE_HELD(&dp
->dp_config_rwlock
) &&
451 dsl_pool_sync_context(dp
);
454 rw_enter(&dp
->dp_config_rwlock
, RW_READER
);
456 err
= dsl_prop_get_ds(ds
,
457 "refreservation", sizeof (uint64_t), 1,
458 &ds
->ds_reserved
, NULL
);
460 err
= dsl_prop_get_ds(ds
,
461 "refquota", sizeof (uint64_t), 1,
462 &ds
->ds_quota
, NULL
);
466 rw_exit(&dp
->dp_config_rwlock
);
468 ds
->ds_reserved
= ds
->ds_quota
= 0;
472 winner
= dmu_buf_set_user_ie(dbuf
, ds
, &ds
->ds_phys
,
476 bplist_destroy(&ds
->ds_pending_deadlist
);
477 dsl_deadlist_close(&ds
->ds_deadlist
);
479 dsl_dataset_drop_ref(ds
->ds_prev
, ds
);
480 dsl_dir_close(ds
->ds_dir
, ds
);
481 mutex_destroy(&ds
->ds_lock
);
482 mutex_destroy(&ds
->ds_recvlock
);
483 mutex_destroy(&ds
->ds_opening_lock
);
484 rw_destroy(&ds
->ds_rwlock
);
485 cv_destroy(&ds
->ds_exclusive_cv
);
486 kmem_free(ds
, sizeof (dsl_dataset_t
));
488 dmu_buf_rele(dbuf
, tag
);
494 unique_insert(ds
->ds_phys
->ds_fsid_guid
);
497 ASSERT3P(ds
->ds_dbuf
, ==, dbuf
);
498 ASSERT3P(ds
->ds_phys
, ==, dbuf
->db_data
);
499 ASSERT(ds
->ds_phys
->ds_prev_snap_obj
!= 0 ||
500 spa_version(dp
->dp_spa
) < SPA_VERSION_ORIGIN
||
501 dp
->dp_origin_snap
== NULL
|| ds
== dp
->dp_origin_snap
);
502 mutex_enter(&ds
->ds_lock
);
503 if (!dsl_pool_sync_context(dp
) && DSL_DATASET_IS_DESTROYED(ds
)) {
504 mutex_exit(&ds
->ds_lock
);
505 dmu_buf_rele(ds
->ds_dbuf
, tag
);
508 mutex_exit(&ds
->ds_lock
);
514 dsl_dataset_hold_ref(dsl_dataset_t
*ds
, void *tag
)
516 dsl_pool_t
*dp
= ds
->ds_dir
->dd_pool
;
519 * In syncing context we don't want the rwlock lock: there
520 * may be an existing writer waiting for sync phase to
521 * finish. We don't need to worry about such writers, since
522 * sync phase is single-threaded, so the writer can't be
523 * doing anything while we are active.
525 if (dsl_pool_sync_context(dp
)) {
526 ASSERT(!DSL_DATASET_IS_DESTROYED(ds
));
531 * Normal users will hold the ds_rwlock as a READER until they
532 * are finished (i.e., call dsl_dataset_rele()). "Owners" will
533 * drop their READER lock after they set the ds_owner field.
535 * If the dataset is being destroyed, the destroy thread will
536 * obtain a WRITER lock for exclusive access after it's done its
537 * open-context work and then change the ds_owner to
538 * dsl_reaper once destruction is assured. So threads
539 * may block here temporarily, until the "destructability" of
540 * the dataset is determined.
542 ASSERT(!RW_WRITE_HELD(&dp
->dp_config_rwlock
));
543 mutex_enter(&ds
->ds_lock
);
544 while (!rw_tryenter(&ds
->ds_rwlock
, RW_READER
)) {
545 rw_exit(&dp
->dp_config_rwlock
);
546 cv_wait(&ds
->ds_exclusive_cv
, &ds
->ds_lock
);
547 if (DSL_DATASET_IS_DESTROYED(ds
)) {
548 mutex_exit(&ds
->ds_lock
);
549 dsl_dataset_drop_ref(ds
, tag
);
550 rw_enter(&dp
->dp_config_rwlock
, RW_READER
);
554 * The dp_config_rwlock lives above the ds_lock. And
555 * we need to check DSL_DATASET_IS_DESTROYED() while
556 * holding the ds_lock, so we have to drop and reacquire
559 mutex_exit(&ds
->ds_lock
);
560 rw_enter(&dp
->dp_config_rwlock
, RW_READER
);
561 mutex_enter(&ds
->ds_lock
);
563 mutex_exit(&ds
->ds_lock
);
568 dsl_dataset_hold_obj(dsl_pool_t
*dp
, uint64_t dsobj
, void *tag
,
571 int err
= dsl_dataset_get_ref(dp
, dsobj
, tag
, dsp
);
575 return (dsl_dataset_hold_ref(*dsp
, tag
));
579 dsl_dataset_own_obj(dsl_pool_t
*dp
, uint64_t dsobj
, boolean_t inconsistentok
,
580 void *tag
, dsl_dataset_t
**dsp
)
582 int err
= dsl_dataset_hold_obj(dp
, dsobj
, tag
, dsp
);
585 if (!dsl_dataset_tryown(*dsp
, inconsistentok
, tag
)) {
586 dsl_dataset_rele(*dsp
, tag
);
594 dsl_dataset_hold(const char *name
, void *tag
, dsl_dataset_t
**dsp
)
598 const char *snapname
;
602 err
= dsl_dir_open_spa(NULL
, name
, FTAG
, &dd
, &snapname
);
607 obj
= dd
->dd_phys
->dd_head_dataset_obj
;
608 rw_enter(&dp
->dp_config_rwlock
, RW_READER
);
610 err
= dsl_dataset_get_ref(dp
, obj
, tag
, dsp
);
616 err
= dsl_dataset_hold_ref(*dsp
, tag
);
618 /* we may be looking for a snapshot */
619 if (err
== 0 && snapname
!= NULL
) {
620 dsl_dataset_t
*ds
= NULL
;
622 if (*snapname
++ != '@') {
623 dsl_dataset_rele(*dsp
, tag
);
628 dprintf("looking for snapshot '%s'\n", snapname
);
629 err
= dsl_dataset_snap_lookup(*dsp
, snapname
, &obj
);
631 err
= dsl_dataset_get_ref(dp
, obj
, tag
, &ds
);
632 dsl_dataset_rele(*dsp
, tag
);
634 ASSERT3U((err
== 0), ==, (ds
!= NULL
));
637 mutex_enter(&ds
->ds_lock
);
638 if (ds
->ds_snapname
[0] == 0)
639 (void) strlcpy(ds
->ds_snapname
, snapname
,
640 sizeof (ds
->ds_snapname
));
641 mutex_exit(&ds
->ds_lock
);
642 err
= dsl_dataset_hold_ref(ds
, tag
);
643 *dsp
= err
? NULL
: ds
;
647 rw_exit(&dp
->dp_config_rwlock
);
648 dsl_dir_close(dd
, FTAG
);
653 dsl_dataset_own(const char *name
, boolean_t inconsistentok
,
654 void *tag
, dsl_dataset_t
**dsp
)
656 int err
= dsl_dataset_hold(name
, tag
, dsp
);
659 if (!dsl_dataset_tryown(*dsp
, inconsistentok
, tag
)) {
660 dsl_dataset_rele(*dsp
, tag
);
667 dsl_dataset_name(dsl_dataset_t
*ds
, char *name
)
670 (void) strcpy(name
, "mos");
672 dsl_dir_name(ds
->ds_dir
, name
);
673 VERIFY(0 == dsl_dataset_get_snapname(ds
));
674 if (ds
->ds_snapname
[0]) {
675 (void) strcat(name
, "@");
677 * We use a "recursive" mutex so that we
678 * can call dprintf_ds() with ds_lock held.
680 if (!MUTEX_HELD(&ds
->ds_lock
)) {
681 mutex_enter(&ds
->ds_lock
);
682 (void) strcat(name
, ds
->ds_snapname
);
683 mutex_exit(&ds
->ds_lock
);
685 (void) strcat(name
, ds
->ds_snapname
);
692 dsl_dataset_namelen(dsl_dataset_t
*ds
)
697 result
= 3; /* "mos" */
699 result
= dsl_dir_namelen(ds
->ds_dir
);
700 VERIFY(0 == dsl_dataset_get_snapname(ds
));
701 if (ds
->ds_snapname
[0]) {
702 ++result
; /* adding one for the @-sign */
703 if (!MUTEX_HELD(&ds
->ds_lock
)) {
704 mutex_enter(&ds
->ds_lock
);
705 result
+= strlen(ds
->ds_snapname
);
706 mutex_exit(&ds
->ds_lock
);
708 result
+= strlen(ds
->ds_snapname
);
717 dsl_dataset_drop_ref(dsl_dataset_t
*ds
, void *tag
)
719 dmu_buf_rele(ds
->ds_dbuf
, tag
);
723 dsl_dataset_rele(dsl_dataset_t
*ds
, void *tag
)
725 if (!dsl_pool_sync_context(ds
->ds_dir
->dd_pool
)) {
726 rw_exit(&ds
->ds_rwlock
);
728 dsl_dataset_drop_ref(ds
, tag
);
732 dsl_dataset_disown(dsl_dataset_t
*ds
, void *tag
)
734 ASSERT((ds
->ds_owner
== tag
&& ds
->ds_dbuf
) ||
735 (DSL_DATASET_IS_DESTROYED(ds
) && ds
->ds_dbuf
== NULL
));
737 mutex_enter(&ds
->ds_lock
);
739 if (RW_WRITE_HELD(&ds
->ds_rwlock
)) {
740 rw_exit(&ds
->ds_rwlock
);
741 cv_broadcast(&ds
->ds_exclusive_cv
);
743 mutex_exit(&ds
->ds_lock
);
745 dsl_dataset_drop_ref(ds
, tag
);
747 dsl_dataset_evict(NULL
, ds
);
751 dsl_dataset_tryown(dsl_dataset_t
*ds
, boolean_t inconsistentok
, void *tag
)
753 boolean_t gotit
= FALSE
;
755 mutex_enter(&ds
->ds_lock
);
756 if (ds
->ds_owner
== NULL
&&
757 (!DS_IS_INCONSISTENT(ds
) || inconsistentok
)) {
759 if (!dsl_pool_sync_context(ds
->ds_dir
->dd_pool
))
760 rw_exit(&ds
->ds_rwlock
);
763 mutex_exit(&ds
->ds_lock
);
768 dsl_dataset_make_exclusive(dsl_dataset_t
*ds
, void *owner
)
770 ASSERT3P(owner
, ==, ds
->ds_owner
);
771 if (!RW_WRITE_HELD(&ds
->ds_rwlock
))
772 rw_enter(&ds
->ds_rwlock
, RW_WRITER
);
776 dsl_dataset_create_sync_dd(dsl_dir_t
*dd
, dsl_dataset_t
*origin
,
777 uint64_t flags
, dmu_tx_t
*tx
)
779 dsl_pool_t
*dp
= dd
->dd_pool
;
781 dsl_dataset_phys_t
*dsphys
;
783 objset_t
*mos
= dp
->dp_meta_objset
;
786 origin
= dp
->dp_origin_snap
;
788 ASSERT(origin
== NULL
|| origin
->ds_dir
->dd_pool
== dp
);
789 ASSERT(origin
== NULL
|| origin
->ds_phys
->ds_num_children
> 0);
790 ASSERT(dmu_tx_is_syncing(tx
));
791 ASSERT(dd
->dd_phys
->dd_head_dataset_obj
== 0);
793 dsobj
= dmu_object_alloc(mos
, DMU_OT_DSL_DATASET
, 0,
794 DMU_OT_DSL_DATASET
, sizeof (dsl_dataset_phys_t
), tx
);
795 VERIFY(0 == dmu_bonus_hold(mos
, dsobj
, FTAG
, &dbuf
));
796 dmu_buf_will_dirty(dbuf
, tx
);
797 dsphys
= dbuf
->db_data
;
798 bzero(dsphys
, sizeof (dsl_dataset_phys_t
));
799 dsphys
->ds_dir_obj
= dd
->dd_object
;
800 dsphys
->ds_flags
= flags
;
801 dsphys
->ds_fsid_guid
= unique_create();
802 (void) random_get_pseudo_bytes((void*)&dsphys
->ds_guid
,
803 sizeof (dsphys
->ds_guid
));
804 dsphys
->ds_snapnames_zapobj
=
805 zap_create_norm(mos
, U8_TEXTPREP_TOUPPER
, DMU_OT_DSL_DS_SNAP_MAP
,
807 dsphys
->ds_creation_time
= gethrestime_sec();
808 dsphys
->ds_creation_txg
= tx
->tx_txg
== TXG_INITIAL
? 1 : tx
->tx_txg
;
810 if (origin
== NULL
) {
811 dsphys
->ds_deadlist_obj
= dsl_deadlist_alloc(mos
, tx
);
815 dsphys
->ds_prev_snap_obj
= origin
->ds_object
;
816 dsphys
->ds_prev_snap_txg
=
817 origin
->ds_phys
->ds_creation_txg
;
818 dsphys
->ds_used_bytes
=
819 origin
->ds_phys
->ds_used_bytes
;
820 dsphys
->ds_compressed_bytes
=
821 origin
->ds_phys
->ds_compressed_bytes
;
822 dsphys
->ds_uncompressed_bytes
=
823 origin
->ds_phys
->ds_uncompressed_bytes
;
824 dsphys
->ds_bp
= origin
->ds_phys
->ds_bp
;
825 dsphys
->ds_flags
|= origin
->ds_phys
->ds_flags
;
827 dmu_buf_will_dirty(origin
->ds_dbuf
, tx
);
828 origin
->ds_phys
->ds_num_children
++;
830 VERIFY3U(0, ==, dsl_dataset_hold_obj(dp
,
831 origin
->ds_dir
->dd_phys
->dd_head_dataset_obj
, FTAG
, &ohds
));
832 dsphys
->ds_deadlist_obj
= dsl_deadlist_clone(&ohds
->ds_deadlist
,
833 dsphys
->ds_prev_snap_txg
, dsphys
->ds_prev_snap_obj
, tx
);
834 dsl_dataset_rele(ohds
, FTAG
);
836 if (spa_version(dp
->dp_spa
) >= SPA_VERSION_NEXT_CLONES
) {
837 if (origin
->ds_phys
->ds_next_clones_obj
== 0) {
838 origin
->ds_phys
->ds_next_clones_obj
=
840 DMU_OT_NEXT_CLONES
, DMU_OT_NONE
, 0, tx
);
842 VERIFY(0 == zap_add_int(mos
,
843 origin
->ds_phys
->ds_next_clones_obj
,
847 dmu_buf_will_dirty(dd
->dd_dbuf
, tx
);
848 dd
->dd_phys
->dd_origin_obj
= origin
->ds_object
;
849 if (spa_version(dp
->dp_spa
) >= SPA_VERSION_DIR_CLONES
) {
850 if (origin
->ds_dir
->dd_phys
->dd_clones
== 0) {
851 dmu_buf_will_dirty(origin
->ds_dir
->dd_dbuf
, tx
);
852 origin
->ds_dir
->dd_phys
->dd_clones
=
854 DMU_OT_DSL_CLONES
, DMU_OT_NONE
, 0, tx
);
856 VERIFY3U(0, ==, zap_add_int(mos
,
857 origin
->ds_dir
->dd_phys
->dd_clones
, dsobj
, tx
));
861 if (spa_version(dp
->dp_spa
) >= SPA_VERSION_UNIQUE_ACCURATE
)
862 dsphys
->ds_flags
|= DS_FLAG_UNIQUE_ACCURATE
;
864 dmu_buf_rele(dbuf
, FTAG
);
866 dmu_buf_will_dirty(dd
->dd_dbuf
, tx
);
867 dd
->dd_phys
->dd_head_dataset_obj
= dsobj
;
873 dsl_dataset_create_sync(dsl_dir_t
*pdd
, const char *lastname
,
874 dsl_dataset_t
*origin
, uint64_t flags
, cred_t
*cr
, dmu_tx_t
*tx
)
876 dsl_pool_t
*dp
= pdd
->dd_pool
;
877 uint64_t dsobj
, ddobj
;
880 ASSERT(lastname
[0] != '@');
882 ddobj
= dsl_dir_create_sync(dp
, pdd
, lastname
, tx
);
883 VERIFY(0 == dsl_dir_open_obj(dp
, ddobj
, lastname
, FTAG
, &dd
));
885 dsobj
= dsl_dataset_create_sync_dd(dd
, origin
, flags
, tx
);
887 dsl_deleg_set_create_perms(dd
, tx
, cr
);
889 dsl_dir_close(dd
, FTAG
);
892 * If we are creating a clone, make sure we zero out any stale
893 * data from the origin snapshots zil header.
895 if (origin
!= NULL
) {
899 VERIFY3U(0, ==, dsl_dataset_hold_obj(dp
, dsobj
, FTAG
, &ds
));
900 VERIFY3U(0, ==, dmu_objset_from_ds(ds
, &os
));
901 bzero(&os
->os_zil_header
, sizeof (os
->os_zil_header
));
902 dsl_dataset_dirty(ds
, tx
);
903 dsl_dataset_rele(ds
, FTAG
);
910 dsl_sync_task_group_t
*dstg
;
917 dsl_snapshot_destroy_one(const char *name
, void *arg
)
919 struct destroyarg
*da
= arg
;
924 dsname
= kmem_asprintf("%s@%s", name
, da
->snapname
);
925 err
= dsl_dataset_own(dsname
, B_TRUE
, da
->dstg
, &ds
);
928 struct dsl_ds_destroyarg
*dsda
;
930 dsl_dataset_make_exclusive(ds
, da
->dstg
);
931 dsda
= kmem_zalloc(sizeof (struct dsl_ds_destroyarg
), KM_SLEEP
);
933 dsda
->defer
= da
->defer
;
934 dsl_sync_task_create(da
->dstg
, dsl_dataset_destroy_check
,
935 dsl_dataset_destroy_sync
, dsda
, da
->dstg
, 0);
936 } else if (err
== ENOENT
) {
939 (void) strcpy(da
->failed
, name
);
945 * Destroy 'snapname' in all descendants of 'fsname'.
947 #pragma weak dmu_snapshots_destroy = dsl_snapshots_destroy
949 dsl_snapshots_destroy(char *fsname
, char *snapname
, boolean_t defer
)
952 struct destroyarg da
;
953 dsl_sync_task_t
*dst
;
956 err
= spa_open(fsname
, &spa
, FTAG
);
959 da
.dstg
= dsl_sync_task_group_create(spa_get_dsl(spa
));
960 da
.snapname
= snapname
;
964 err
= dmu_objset_find(fsname
,
965 dsl_snapshot_destroy_one
, &da
, DS_FIND_CHILDREN
);
968 err
= dsl_sync_task_group_wait(da
.dstg
);
970 for (dst
= list_head(&da
.dstg
->dstg_tasks
); dst
;
971 dst
= list_next(&da
.dstg
->dstg_tasks
, dst
)) {
972 struct dsl_ds_destroyarg
*dsda
= dst
->dst_arg1
;
973 dsl_dataset_t
*ds
= dsda
->ds
;
976 * Return the file system name that triggered the error
979 dsl_dataset_name(ds
, fsname
);
980 *strchr(fsname
, '@') = '\0';
982 ASSERT3P(dsda
->rm_origin
, ==, NULL
);
983 dsl_dataset_disown(ds
, da
.dstg
);
984 kmem_free(dsda
, sizeof (struct dsl_ds_destroyarg
));
987 dsl_sync_task_group_destroy(da
.dstg
);
988 spa_close(spa
, FTAG
);
993 dsl_dataset_might_destroy_origin(dsl_dataset_t
*ds
)
995 boolean_t might_destroy
= B_FALSE
;
997 mutex_enter(&ds
->ds_lock
);
998 if (ds
->ds_phys
->ds_num_children
== 2 && ds
->ds_userrefs
== 0 &&
999 DS_IS_DEFER_DESTROY(ds
))
1000 might_destroy
= B_TRUE
;
1001 mutex_exit(&ds
->ds_lock
);
1003 return (might_destroy
);
1007 * If we're removing a clone, and these three conditions are true:
1008 * 1) the clone's origin has no other children
1009 * 2) the clone's origin has no user references
1010 * 3) the clone's origin has been marked for deferred destruction
1011 * Then, prepare to remove the origin as part of this sync task group.
1014 dsl_dataset_origin_rm_prep(struct dsl_ds_destroyarg
*dsda
, void *tag
)
1016 dsl_dataset_t
*ds
= dsda
->ds
;
1017 dsl_dataset_t
*origin
= ds
->ds_prev
;
1019 if (dsl_dataset_might_destroy_origin(origin
)) {
1024 namelen
= dsl_dataset_namelen(origin
) + 1;
1025 name
= kmem_alloc(namelen
, KM_SLEEP
);
1026 dsl_dataset_name(origin
, name
);
1028 error
= zfs_unmount_snap(name
, NULL
);
1030 kmem_free(name
, namelen
);
1034 error
= dsl_dataset_own(name
, B_TRUE
, tag
, &origin
);
1035 kmem_free(name
, namelen
);
1038 dsda
->rm_origin
= origin
;
1039 dsl_dataset_make_exclusive(origin
, tag
);
1046 * ds must be opened as OWNER. On return (whether successful or not),
1047 * ds will be closed and caller can no longer dereference it.
1050 dsl_dataset_destroy(dsl_dataset_t
*ds
, void *tag
, boolean_t defer
)
1053 dsl_sync_task_group_t
*dstg
;
1057 struct dsl_ds_destroyarg dsda
= { 0 };
1058 dsl_dataset_t
*dummy_ds
;
1062 if (dsl_dataset_is_snapshot(ds
)) {
1063 /* Destroying a snapshot is simpler */
1064 dsl_dataset_make_exclusive(ds
, tag
);
1067 err
= dsl_sync_task_do(ds
->ds_dir
->dd_pool
,
1068 dsl_dataset_destroy_check
, dsl_dataset_destroy_sync
,
1070 ASSERT3P(dsda
.rm_origin
, ==, NULL
);
1078 dummy_ds
= kmem_zalloc(sizeof (dsl_dataset_t
), KM_SLEEP
);
1079 dummy_ds
->ds_dir
= dd
;
1080 dummy_ds
->ds_object
= ds
->ds_object
;
1083 * Check for errors and mark this ds as inconsistent, in
1084 * case we crash while freeing the objects.
1086 err
= dsl_sync_task_do(dd
->dd_pool
, dsl_dataset_destroy_begin_check
,
1087 dsl_dataset_destroy_begin_sync
, ds
, NULL
, 0);
1091 err
= dmu_objset_from_ds(ds
, &os
);
1096 * remove the objects in open context, so that we won't
1097 * have too much to do in syncing context.
1099 for (obj
= 0; err
== 0; err
= dmu_object_next(os
, &obj
, FALSE
,
1100 ds
->ds_phys
->ds_prev_snap_txg
)) {
1102 * Ignore errors, if there is not enough disk space
1103 * we will deal with it in dsl_dataset_destroy_sync().
1105 (void) dmu_free_object(os
, obj
);
1111 * Only the ZIL knows how to free log blocks.
1113 zil_destroy(dmu_objset_zil(os
), B_FALSE
);
1116 * Sync out all in-flight IO.
1118 txg_wait_synced(dd
->dd_pool
, 0);
1121 * If we managed to free all the objects in open
1122 * context, the user space accounting should be zero.
1124 if (ds
->ds_phys
->ds_bp
.blk_fill
== 0 &&
1125 dmu_objset_userused_enabled(os
)) {
1126 ASSERTV(uint64_t count
);
1127 ASSERT(zap_count(os
, DMU_USERUSED_OBJECT
, &count
) != 0 ||
1129 ASSERT(zap_count(os
, DMU_GROUPUSED_OBJECT
, &count
) != 0 ||
1133 rw_enter(&dd
->dd_pool
->dp_config_rwlock
, RW_READER
);
1134 err
= dsl_dir_open_obj(dd
->dd_pool
, dd
->dd_object
, NULL
, FTAG
, &dd
);
1135 rw_exit(&dd
->dd_pool
->dp_config_rwlock
);
1141 * Blow away the dsl_dir + head dataset.
1143 dsl_dataset_make_exclusive(ds
, tag
);
1145 * If we're removing a clone, we might also need to remove its
1149 dsda
.need_prep
= B_FALSE
;
1150 if (dsl_dir_is_clone(dd
)) {
1151 err
= dsl_dataset_origin_rm_prep(&dsda
, tag
);
1153 dsl_dir_close(dd
, FTAG
);
1158 dstg
= dsl_sync_task_group_create(ds
->ds_dir
->dd_pool
);
1159 dsl_sync_task_create(dstg
, dsl_dataset_destroy_check
,
1160 dsl_dataset_destroy_sync
, &dsda
, tag
, 0);
1161 dsl_sync_task_create(dstg
, dsl_dir_destroy_check
,
1162 dsl_dir_destroy_sync
, dummy_ds
, FTAG
, 0);
1163 err
= dsl_sync_task_group_wait(dstg
);
1164 dsl_sync_task_group_destroy(dstg
);
1167 * We could be racing against 'zfs release' or 'zfs destroy -d'
1168 * on the origin snap, in which case we can get EBUSY if we
1169 * needed to destroy the origin snap but were not ready to
1172 if (dsda
.need_prep
) {
1173 ASSERT(err
== EBUSY
);
1174 ASSERT(dsl_dir_is_clone(dd
));
1175 ASSERT(dsda
.rm_origin
== NULL
);
1177 } while (dsda
.need_prep
);
1179 if (dsda
.rm_origin
!= NULL
)
1180 dsl_dataset_disown(dsda
.rm_origin
, tag
);
1182 /* if it is successful, dsl_dir_destroy_sync will close the dd */
1184 dsl_dir_close(dd
, FTAG
);
1187 kmem_free(dummy_ds
, sizeof (dsl_dataset_t
));
1189 dsl_dataset_disown(ds
, tag
);
1194 dsl_dataset_get_blkptr(dsl_dataset_t
*ds
)
1196 return (&ds
->ds_phys
->ds_bp
);
1200 dsl_dataset_set_blkptr(dsl_dataset_t
*ds
, blkptr_t
*bp
, dmu_tx_t
*tx
)
1202 ASSERT(dmu_tx_is_syncing(tx
));
1203 /* If it's the meta-objset, set dp_meta_rootbp */
1205 tx
->tx_pool
->dp_meta_rootbp
= *bp
;
1207 dmu_buf_will_dirty(ds
->ds_dbuf
, tx
);
1208 ds
->ds_phys
->ds_bp
= *bp
;
1213 dsl_dataset_get_spa(dsl_dataset_t
*ds
)
1215 return (ds
->ds_dir
->dd_pool
->dp_spa
);
1219 dsl_dataset_dirty(dsl_dataset_t
*ds
, dmu_tx_t
*tx
)
1223 if (ds
== NULL
) /* this is the meta-objset */
1226 ASSERT(ds
->ds_objset
!= NULL
);
1228 if (ds
->ds_phys
->ds_next_snap_obj
!= 0)
1229 panic("dirtying snapshot!");
1231 dp
= ds
->ds_dir
->dd_pool
;
1233 if (txg_list_add(&dp
->dp_dirty_datasets
, ds
, tx
->tx_txg
) == 0) {
1234 /* up the hold count until we can be written out */
1235 dmu_buf_add_ref(ds
->ds_dbuf
, ds
);
1240 * The unique space in the head dataset can be calculated by subtracting
1241 * the space used in the most recent snapshot, that is still being used
1242 * in this file system, from the space currently in use. To figure out
1243 * the space in the most recent snapshot still in use, we need to take
1244 * the total space used in the snapshot and subtract out the space that
1245 * has been freed up since the snapshot was taken.
1248 dsl_dataset_recalc_head_uniq(dsl_dataset_t
*ds
)
1251 uint64_t dlused
, dlcomp
, dluncomp
;
1253 ASSERT(!dsl_dataset_is_snapshot(ds
));
1255 if (ds
->ds_phys
->ds_prev_snap_obj
!= 0)
1256 mrs_used
= ds
->ds_prev
->ds_phys
->ds_used_bytes
;
1260 dsl_deadlist_space(&ds
->ds_deadlist
, &dlused
, &dlcomp
, &dluncomp
);
1262 ASSERT3U(dlused
, <=, mrs_used
);
1263 ds
->ds_phys
->ds_unique_bytes
=
1264 ds
->ds_phys
->ds_used_bytes
- (mrs_used
- dlused
);
1266 if (spa_version(ds
->ds_dir
->dd_pool
->dp_spa
) >=
1267 SPA_VERSION_UNIQUE_ACCURATE
)
1268 ds
->ds_phys
->ds_flags
|= DS_FLAG_UNIQUE_ACCURATE
;
1278 kill_blkptr(spa_t
*spa
, zilog_t
*zilog
, const blkptr_t
*bp
, arc_buf_t
*pbuf
,
1279 const zbookmark_t
*zb
, const dnode_phys_t
*dnp
, void *arg
)
1281 struct killarg
*ka
= arg
;
1282 dmu_tx_t
*tx
= ka
->tx
;
1287 if (zb
->zb_level
== ZB_ZIL_LEVEL
) {
1288 ASSERT(zilog
!= NULL
);
1290 * It's a block in the intent log. It has no
1291 * accounting, so just free it.
1293 dsl_free(ka
->tx
->tx_pool
, ka
->tx
->tx_txg
, bp
);
1295 ASSERT(zilog
== NULL
);
1296 ASSERT3U(bp
->blk_birth
, >, ka
->ds
->ds_phys
->ds_prev_snap_txg
);
1297 (void) dsl_dataset_block_kill(ka
->ds
, bp
, tx
, B_FALSE
);
1305 dsl_dataset_destroy_begin_check(void *arg1
, void *arg2
, dmu_tx_t
*tx
)
1307 dsl_dataset_t
*ds
= arg1
;
1308 objset_t
*mos
= ds
->ds_dir
->dd_pool
->dp_meta_objset
;
1313 * Can't delete a head dataset if there are snapshots of it.
1314 * (Except if the only snapshots are from the branch we cloned
1317 if (ds
->ds_prev
!= NULL
&&
1318 ds
->ds_prev
->ds_phys
->ds_next_snap_obj
== ds
->ds_object
)
1322 * This is really a dsl_dir thing, but check it here so that
1323 * we'll be less likely to leave this dataset inconsistent &
1326 err
= zap_count(mos
, ds
->ds_dir
->dd_phys
->dd_child_dir_zapobj
, &count
);
1337 dsl_dataset_destroy_begin_sync(void *arg1
, void *arg2
, dmu_tx_t
*tx
)
1339 dsl_dataset_t
*ds
= arg1
;
1340 dsl_pool_t
*dp
= ds
->ds_dir
->dd_pool
;
1342 /* Mark it as inconsistent on-disk, in case we crash */
1343 dmu_buf_will_dirty(ds
->ds_dbuf
, tx
);
1344 ds
->ds_phys
->ds_flags
|= DS_FLAG_INCONSISTENT
;
1346 spa_history_log_internal(LOG_DS_DESTROY_BEGIN
, dp
->dp_spa
, tx
,
1347 "dataset = %llu", ds
->ds_object
);
1351 dsl_dataset_origin_check(struct dsl_ds_destroyarg
*dsda
, void *tag
,
1354 dsl_dataset_t
*ds
= dsda
->ds
;
1355 dsl_dataset_t
*ds_prev
= ds
->ds_prev
;
1357 if (dsl_dataset_might_destroy_origin(ds_prev
)) {
1358 struct dsl_ds_destroyarg ndsda
= {0};
1361 * If we're not prepared to remove the origin, don't remove
1364 if (dsda
->rm_origin
== NULL
) {
1365 dsda
->need_prep
= B_TRUE
;
1370 ndsda
.is_origin_rm
= B_TRUE
;
1371 return (dsl_dataset_destroy_check(&ndsda
, tag
, tx
));
1375 * If we're not going to remove the origin after all,
1376 * undo the open context setup.
1378 if (dsda
->rm_origin
!= NULL
) {
1379 dsl_dataset_disown(dsda
->rm_origin
, tag
);
1380 dsda
->rm_origin
= NULL
;
1387 * If you add new checks here, you may need to add
1388 * additional checks to the "temporary" case in
1389 * snapshot_check() in dmu_objset.c.
1393 dsl_dataset_destroy_check(void *arg1
, void *arg2
, dmu_tx_t
*tx
)
1395 struct dsl_ds_destroyarg
*dsda
= arg1
;
1396 dsl_dataset_t
*ds
= dsda
->ds
;
1398 /* we have an owner hold, so noone else can destroy us */
1399 ASSERT(!DSL_DATASET_IS_DESTROYED(ds
));
1402 * Only allow deferred destroy on pools that support it.
1403 * NOTE: deferred destroy is only supported on snapshots.
1406 if (spa_version(ds
->ds_dir
->dd_pool
->dp_spa
) <
1407 SPA_VERSION_USERREFS
)
1409 ASSERT(dsl_dataset_is_snapshot(ds
));
1414 * Can't delete a head dataset if there are snapshots of it.
1415 * (Except if the only snapshots are from the branch we cloned
1418 if (ds
->ds_prev
!= NULL
&&
1419 ds
->ds_prev
->ds_phys
->ds_next_snap_obj
== ds
->ds_object
)
1423 * If we made changes this txg, traverse_dsl_dataset won't find
1426 if (ds
->ds_phys
->ds_bp
.blk_birth
>= tx
->tx_txg
)
1429 if (dsl_dataset_is_snapshot(ds
)) {
1431 * If this snapshot has an elevated user reference count,
1432 * we can't destroy it yet.
1434 if (ds
->ds_userrefs
> 0 && !dsda
->releasing
)
1437 mutex_enter(&ds
->ds_lock
);
1439 * Can't delete a branch point. However, if we're destroying
1440 * a clone and removing its origin due to it having a user
1441 * hold count of 0 and having been marked for deferred destroy,
1442 * it's OK for the origin to have a single clone.
1444 if (ds
->ds_phys
->ds_num_children
>
1445 (dsda
->is_origin_rm
? 2 : 1)) {
1446 mutex_exit(&ds
->ds_lock
);
1449 mutex_exit(&ds
->ds_lock
);
1450 } else if (dsl_dir_is_clone(ds
->ds_dir
)) {
1451 return (dsl_dataset_origin_check(dsda
, arg2
, tx
));
1454 /* XXX we should do some i/o error checking... */
1466 dsl_dataset_refs_gone(dmu_buf_t
*db
, void *argv
)
1468 struct refsarg
*arg
= argv
;
1470 mutex_enter(&arg
->lock
);
1472 cv_signal(&arg
->cv
);
1473 mutex_exit(&arg
->lock
);
1477 dsl_dataset_drain_refs(dsl_dataset_t
*ds
, void *tag
)
1481 mutex_init(&arg
.lock
, NULL
, MUTEX_DEFAULT
, NULL
);
1482 cv_init(&arg
.cv
, NULL
, CV_DEFAULT
, NULL
);
1484 (void) dmu_buf_update_user(ds
->ds_dbuf
, ds
, &arg
, &ds
->ds_phys
,
1485 dsl_dataset_refs_gone
);
1486 dmu_buf_rele(ds
->ds_dbuf
, tag
);
1487 mutex_enter(&arg
.lock
);
1489 cv_wait(&arg
.cv
, &arg
.lock
);
1491 mutex_exit(&arg
.lock
);
1494 mutex_destroy(&arg
.lock
);
1495 cv_destroy(&arg
.cv
);
1499 remove_from_next_clones(dsl_dataset_t
*ds
, uint64_t obj
, dmu_tx_t
*tx
)
1501 objset_t
*mos
= ds
->ds_dir
->dd_pool
->dp_meta_objset
;
1503 ASSERTV(uint64_t count
);
1505 ASSERT(ds
->ds_phys
->ds_num_children
>= 2);
1506 err
= zap_remove_int(mos
, ds
->ds_phys
->ds_next_clones_obj
, obj
, tx
);
1508 * The err should not be ENOENT, but a bug in a previous version
1509 * of the code could cause upgrade_clones_cb() to not set
1510 * ds_next_snap_obj when it should, leading to a missing entry.
1511 * If we knew that the pool was created after
1512 * SPA_VERSION_NEXT_CLONES, we could assert that it isn't
1513 * ENOENT. However, at least we can check that we don't have
1514 * too many entries in the next_clones_obj even after failing to
1517 if (err
!= ENOENT
) {
1518 VERIFY3U(err
, ==, 0);
1520 ASSERT3U(0, ==, zap_count(mos
, ds
->ds_phys
->ds_next_clones_obj
,
1522 ASSERT3U(count
, <=, ds
->ds_phys
->ds_num_children
- 2);
1526 dsl_dataset_remove_clones_key(dsl_dataset_t
*ds
, uint64_t mintxg
, dmu_tx_t
*tx
)
1528 objset_t
*mos
= ds
->ds_dir
->dd_pool
->dp_meta_objset
;
1533 * If it is the old version, dd_clones doesn't exist so we can't
1534 * find the clones, but deadlist_remove_key() is a no-op so it
1537 if (ds
->ds_dir
->dd_phys
->dd_clones
== 0)
1540 for (zap_cursor_init(&zc
, mos
, ds
->ds_dir
->dd_phys
->dd_clones
);
1541 zap_cursor_retrieve(&zc
, &za
) == 0;
1542 zap_cursor_advance(&zc
)) {
1543 dsl_dataset_t
*clone
;
1545 VERIFY3U(0, ==, dsl_dataset_hold_obj(ds
->ds_dir
->dd_pool
,
1546 za
.za_first_integer
, FTAG
, &clone
));
1547 if (clone
->ds_dir
->dd_origin_txg
> mintxg
) {
1548 dsl_deadlist_remove_key(&clone
->ds_deadlist
,
1550 dsl_dataset_remove_clones_key(clone
, mintxg
, tx
);
1552 dsl_dataset_rele(clone
, FTAG
);
1554 zap_cursor_fini(&zc
);
1557 struct process_old_arg
{
1559 dsl_dataset_t
*ds_prev
;
1560 boolean_t after_branch_point
;
1562 uint64_t used
, comp
, uncomp
;
1566 process_old_cb(void *arg
, const blkptr_t
*bp
, dmu_tx_t
*tx
)
1568 struct process_old_arg
*poa
= arg
;
1569 dsl_pool_t
*dp
= poa
->ds
->ds_dir
->dd_pool
;
1571 if (bp
->blk_birth
<= poa
->ds
->ds_phys
->ds_prev_snap_txg
) {
1572 dsl_deadlist_insert(&poa
->ds
->ds_deadlist
, bp
, tx
);
1573 if (poa
->ds_prev
&& !poa
->after_branch_point
&&
1575 poa
->ds_prev
->ds_phys
->ds_prev_snap_txg
) {
1576 poa
->ds_prev
->ds_phys
->ds_unique_bytes
+=
1577 bp_get_dsize_sync(dp
->dp_spa
, bp
);
1580 poa
->used
+= bp_get_dsize_sync(dp
->dp_spa
, bp
);
1581 poa
->comp
+= BP_GET_PSIZE(bp
);
1582 poa
->uncomp
+= BP_GET_UCSIZE(bp
);
1583 dsl_free_sync(poa
->pio
, dp
, tx
->tx_txg
, bp
);
1589 process_old_deadlist(dsl_dataset_t
*ds
, dsl_dataset_t
*ds_prev
,
1590 dsl_dataset_t
*ds_next
, boolean_t after_branch_point
, dmu_tx_t
*tx
)
1592 struct process_old_arg poa
= { 0 };
1593 dsl_pool_t
*dp
= ds
->ds_dir
->dd_pool
;
1594 objset_t
*mos
= dp
->dp_meta_objset
;
1596 ASSERT(ds
->ds_deadlist
.dl_oldfmt
);
1597 ASSERT(ds_next
->ds_deadlist
.dl_oldfmt
);
1600 poa
.ds_prev
= ds_prev
;
1601 poa
.after_branch_point
= after_branch_point
;
1602 poa
.pio
= zio_root(dp
->dp_spa
, NULL
, NULL
, ZIO_FLAG_MUSTSUCCEED
);
1603 VERIFY3U(0, ==, bpobj_iterate(&ds_next
->ds_deadlist
.dl_bpobj
,
1604 process_old_cb
, &poa
, tx
));
1605 VERIFY3U(zio_wait(poa
.pio
), ==, 0);
1606 ASSERT3U(poa
.used
, ==, ds
->ds_phys
->ds_unique_bytes
);
1608 /* change snapused */
1609 dsl_dir_diduse_space(ds
->ds_dir
, DD_USED_SNAP
,
1610 -poa
.used
, -poa
.comp
, -poa
.uncomp
, tx
);
1612 /* swap next's deadlist to our deadlist */
1613 dsl_deadlist_close(&ds
->ds_deadlist
);
1614 dsl_deadlist_close(&ds_next
->ds_deadlist
);
1615 SWITCH64(ds_next
->ds_phys
->ds_deadlist_obj
,
1616 ds
->ds_phys
->ds_deadlist_obj
);
1617 dsl_deadlist_open(&ds
->ds_deadlist
, mos
, ds
->ds_phys
->ds_deadlist_obj
);
1618 dsl_deadlist_open(&ds_next
->ds_deadlist
, mos
,
1619 ds_next
->ds_phys
->ds_deadlist_obj
);
1623 dsl_dataset_destroy_sync(void *arg1
, void *tag
, dmu_tx_t
*tx
)
1625 struct dsl_ds_destroyarg
*dsda
= arg1
;
1626 dsl_dataset_t
*ds
= dsda
->ds
;
1628 int after_branch_point
= FALSE
;
1629 dsl_pool_t
*dp
= ds
->ds_dir
->dd_pool
;
1630 objset_t
*mos
= dp
->dp_meta_objset
;
1631 dsl_dataset_t
*ds_prev
= NULL
;
1632 boolean_t wont_destroy
;
1635 wont_destroy
= (dsda
->defer
&&
1636 (ds
->ds_userrefs
> 0 || ds
->ds_phys
->ds_num_children
> 1));
1638 ASSERT(ds
->ds_owner
|| wont_destroy
);
1639 ASSERT(dsda
->defer
|| ds
->ds_phys
->ds_num_children
<= 1);
1640 ASSERT(ds
->ds_prev
== NULL
||
1641 ds
->ds_prev
->ds_phys
->ds_next_snap_obj
!= ds
->ds_object
);
1642 ASSERT3U(ds
->ds_phys
->ds_bp
.blk_birth
, <=, tx
->tx_txg
);
1645 ASSERT(spa_version(dp
->dp_spa
) >= SPA_VERSION_USERREFS
);
1646 dmu_buf_will_dirty(ds
->ds_dbuf
, tx
);
1647 ds
->ds_phys
->ds_flags
|= DS_FLAG_DEFER_DESTROY
;
1651 /* signal any waiters that this dataset is going away */
1652 mutex_enter(&ds
->ds_lock
);
1653 ds
->ds_owner
= dsl_reaper
;
1654 cv_broadcast(&ds
->ds_exclusive_cv
);
1655 mutex_exit(&ds
->ds_lock
);
1657 /* Remove our reservation */
1658 if (ds
->ds_reserved
!= 0) {
1659 dsl_prop_setarg_t psa
;
1662 dsl_prop_setarg_init_uint64(&psa
, "refreservation",
1663 (ZPROP_SRC_NONE
| ZPROP_SRC_LOCAL
| ZPROP_SRC_RECEIVED
),
1665 psa
.psa_effective_value
= 0; /* predict default value */
1667 dsl_dataset_set_reservation_sync(ds
, &psa
, tx
);
1668 ASSERT3U(ds
->ds_reserved
, ==, 0);
1671 ASSERT(RW_WRITE_HELD(&dp
->dp_config_rwlock
));
1673 dsl_scan_ds_destroyed(ds
, tx
);
1675 obj
= ds
->ds_object
;
1677 if (ds
->ds_phys
->ds_prev_snap_obj
!= 0) {
1679 ds_prev
= ds
->ds_prev
;
1681 VERIFY(0 == dsl_dataset_hold_obj(dp
,
1682 ds
->ds_phys
->ds_prev_snap_obj
, FTAG
, &ds_prev
));
1684 after_branch_point
=
1685 (ds_prev
->ds_phys
->ds_next_snap_obj
!= obj
);
1687 dmu_buf_will_dirty(ds_prev
->ds_dbuf
, tx
);
1688 if (after_branch_point
&&
1689 ds_prev
->ds_phys
->ds_next_clones_obj
!= 0) {
1690 remove_from_next_clones(ds_prev
, obj
, tx
);
1691 if (ds
->ds_phys
->ds_next_snap_obj
!= 0) {
1692 VERIFY(0 == zap_add_int(mos
,
1693 ds_prev
->ds_phys
->ds_next_clones_obj
,
1694 ds
->ds_phys
->ds_next_snap_obj
, tx
));
1697 if (after_branch_point
&&
1698 ds
->ds_phys
->ds_next_snap_obj
== 0) {
1699 /* This clone is toast. */
1700 ASSERT(ds_prev
->ds_phys
->ds_num_children
> 1);
1701 ds_prev
->ds_phys
->ds_num_children
--;
1704 * If the clone's origin has no other clones, no
1705 * user holds, and has been marked for deferred
1706 * deletion, then we should have done the necessary
1707 * destroy setup for it.
1709 if (ds_prev
->ds_phys
->ds_num_children
== 1 &&
1710 ds_prev
->ds_userrefs
== 0 &&
1711 DS_IS_DEFER_DESTROY(ds_prev
)) {
1712 ASSERT3P(dsda
->rm_origin
, !=, NULL
);
1714 ASSERT3P(dsda
->rm_origin
, ==, NULL
);
1716 } else if (!after_branch_point
) {
1717 ds_prev
->ds_phys
->ds_next_snap_obj
=
1718 ds
->ds_phys
->ds_next_snap_obj
;
1722 if (dsl_dataset_is_snapshot(ds
)) {
1723 dsl_dataset_t
*ds_next
;
1724 uint64_t old_unique
;
1725 uint64_t used
= 0, comp
= 0, uncomp
= 0;
1727 VERIFY(0 == dsl_dataset_hold_obj(dp
,
1728 ds
->ds_phys
->ds_next_snap_obj
, FTAG
, &ds_next
));
1729 ASSERT3U(ds_next
->ds_phys
->ds_prev_snap_obj
, ==, obj
);
1731 old_unique
= ds_next
->ds_phys
->ds_unique_bytes
;
1733 dmu_buf_will_dirty(ds_next
->ds_dbuf
, tx
);
1734 ds_next
->ds_phys
->ds_prev_snap_obj
=
1735 ds
->ds_phys
->ds_prev_snap_obj
;
1736 ds_next
->ds_phys
->ds_prev_snap_txg
=
1737 ds
->ds_phys
->ds_prev_snap_txg
;
1738 ASSERT3U(ds
->ds_phys
->ds_prev_snap_txg
, ==,
1739 ds_prev
? ds_prev
->ds_phys
->ds_creation_txg
: 0);
1742 if (ds_next
->ds_deadlist
.dl_oldfmt
) {
1743 process_old_deadlist(ds
, ds_prev
, ds_next
,
1744 after_branch_point
, tx
);
1746 /* Adjust prev's unique space. */
1747 if (ds_prev
&& !after_branch_point
) {
1748 dsl_deadlist_space_range(&ds_next
->ds_deadlist
,
1749 ds_prev
->ds_phys
->ds_prev_snap_txg
,
1750 ds
->ds_phys
->ds_prev_snap_txg
,
1751 &used
, &comp
, &uncomp
);
1752 ds_prev
->ds_phys
->ds_unique_bytes
+= used
;
1755 /* Adjust snapused. */
1756 dsl_deadlist_space_range(&ds_next
->ds_deadlist
,
1757 ds
->ds_phys
->ds_prev_snap_txg
, UINT64_MAX
,
1758 &used
, &comp
, &uncomp
);
1759 dsl_dir_diduse_space(ds
->ds_dir
, DD_USED_SNAP
,
1760 -used
, -comp
, -uncomp
, tx
);
1762 /* Move blocks to be freed to pool's free list. */
1763 dsl_deadlist_move_bpobj(&ds_next
->ds_deadlist
,
1764 &dp
->dp_free_bpobj
, ds
->ds_phys
->ds_prev_snap_txg
,
1766 dsl_dir_diduse_space(tx
->tx_pool
->dp_free_dir
,
1767 DD_USED_HEAD
, used
, comp
, uncomp
, tx
);
1768 dsl_dir_dirty(tx
->tx_pool
->dp_free_dir
, tx
);
1770 /* Merge our deadlist into next's and free it. */
1771 dsl_deadlist_merge(&ds_next
->ds_deadlist
,
1772 ds
->ds_phys
->ds_deadlist_obj
, tx
);
1774 dsl_deadlist_close(&ds
->ds_deadlist
);
1775 dsl_deadlist_free(mos
, ds
->ds_phys
->ds_deadlist_obj
, tx
);
1777 /* Collapse range in clone heads */
1778 dsl_dataset_remove_clones_key(ds
,
1779 ds
->ds_phys
->ds_creation_txg
, tx
);
1781 if (dsl_dataset_is_snapshot(ds_next
)) {
1782 dsl_dataset_t
*ds_nextnext
;
1786 * Update next's unique to include blocks which
1787 * were previously shared by only this snapshot
1788 * and it. Those blocks will be born after the
1789 * prev snap and before this snap, and will have
1790 * died after the next snap and before the one
1791 * after that (ie. be on the snap after next's
1794 VERIFY(0 == dsl_dataset_hold_obj(dp
,
1795 ds_next
->ds_phys
->ds_next_snap_obj
,
1796 FTAG
, &ds_nextnext
));
1797 dsl_deadlist_space_range(&ds_nextnext
->ds_deadlist
,
1798 ds
->ds_phys
->ds_prev_snap_txg
,
1799 ds
->ds_phys
->ds_creation_txg
,
1800 &used
, &comp
, &uncomp
);
1801 ds_next
->ds_phys
->ds_unique_bytes
+= used
;
1802 dsl_dataset_rele(ds_nextnext
, FTAG
);
1803 ASSERT3P(ds_next
->ds_prev
, ==, NULL
);
1805 /* Collapse range in this head. */
1806 VERIFY3U(0, ==, dsl_dataset_hold_obj(dp
,
1807 ds
->ds_dir
->dd_phys
->dd_head_dataset_obj
,
1809 dsl_deadlist_remove_key(&hds
->ds_deadlist
,
1810 ds
->ds_phys
->ds_creation_txg
, tx
);
1811 dsl_dataset_rele(hds
, FTAG
);
1814 ASSERT3P(ds_next
->ds_prev
, ==, ds
);
1815 dsl_dataset_drop_ref(ds_next
->ds_prev
, ds_next
);
1816 ds_next
->ds_prev
= NULL
;
1818 VERIFY(0 == dsl_dataset_get_ref(dp
,
1819 ds
->ds_phys
->ds_prev_snap_obj
,
1820 ds_next
, &ds_next
->ds_prev
));
1823 dsl_dataset_recalc_head_uniq(ds_next
);
1826 * Reduce the amount of our unconsmed refreservation
1827 * being charged to our parent by the amount of
1828 * new unique data we have gained.
1830 if (old_unique
< ds_next
->ds_reserved
) {
1832 uint64_t new_unique
=
1833 ds_next
->ds_phys
->ds_unique_bytes
;
1835 ASSERT(old_unique
<= new_unique
);
1836 mrsdelta
= MIN(new_unique
- old_unique
,
1837 ds_next
->ds_reserved
- old_unique
);
1838 dsl_dir_diduse_space(ds
->ds_dir
,
1839 DD_USED_REFRSRV
, -mrsdelta
, 0, 0, tx
);
1842 dsl_dataset_rele(ds_next
, FTAG
);
1845 * There's no next snapshot, so this is a head dataset.
1846 * Destroy the deadlist. Unless it's a clone, the
1847 * deadlist should be empty. (If it's a clone, it's
1848 * safe to ignore the deadlist contents.)
1852 dsl_deadlist_close(&ds
->ds_deadlist
);
1853 dsl_deadlist_free(mos
, ds
->ds_phys
->ds_deadlist_obj
, tx
);
1854 ds
->ds_phys
->ds_deadlist_obj
= 0;
1857 * Free everything that we point to (that's born after
1858 * the previous snapshot, if we are a clone)
1860 * NB: this should be very quick, because we already
1861 * freed all the objects in open context.
1865 err
= traverse_dataset(ds
, ds
->ds_phys
->ds_prev_snap_txg
,
1866 TRAVERSE_POST
, kill_blkptr
, &ka
);
1867 ASSERT3U(err
, ==, 0);
1868 ASSERT(!DS_UNIQUE_IS_ACCURATE(ds
) ||
1869 ds
->ds_phys
->ds_unique_bytes
== 0);
1871 if (ds
->ds_prev
!= NULL
) {
1872 if (spa_version(dp
->dp_spa
) >= SPA_VERSION_DIR_CLONES
) {
1873 VERIFY3U(0, ==, zap_remove_int(mos
,
1874 ds
->ds_prev
->ds_dir
->dd_phys
->dd_clones
,
1875 ds
->ds_object
, tx
));
1877 dsl_dataset_rele(ds
->ds_prev
, ds
);
1878 ds
->ds_prev
= ds_prev
= NULL
;
1883 * This must be done after the dsl_traverse(), because it will
1884 * re-open the objset.
1886 if (ds
->ds_objset
) {
1887 dmu_objset_evict(ds
->ds_objset
);
1888 ds
->ds_objset
= NULL
;
1891 if (ds
->ds_dir
->dd_phys
->dd_head_dataset_obj
== ds
->ds_object
) {
1892 /* Erase the link in the dir */
1893 dmu_buf_will_dirty(ds
->ds_dir
->dd_dbuf
, tx
);
1894 ds
->ds_dir
->dd_phys
->dd_head_dataset_obj
= 0;
1895 ASSERT(ds
->ds_phys
->ds_snapnames_zapobj
!= 0);
1896 err
= zap_destroy(mos
, ds
->ds_phys
->ds_snapnames_zapobj
, tx
);
1899 /* remove from snapshot namespace */
1900 dsl_dataset_t
*ds_head
;
1901 ASSERT(ds
->ds_phys
->ds_snapnames_zapobj
== 0);
1902 VERIFY(0 == dsl_dataset_hold_obj(dp
,
1903 ds
->ds_dir
->dd_phys
->dd_head_dataset_obj
, FTAG
, &ds_head
));
1904 VERIFY(0 == dsl_dataset_get_snapname(ds
));
1909 err
= dsl_dataset_snap_lookup(ds_head
,
1910 ds
->ds_snapname
, &val
);
1911 ASSERT3U(err
, ==, 0);
1912 ASSERT3U(val
, ==, obj
);
1915 err
= dsl_dataset_snap_remove(ds_head
, ds
->ds_snapname
, tx
);
1917 dsl_dataset_rele(ds_head
, FTAG
);
1920 if (ds_prev
&& ds
->ds_prev
!= ds_prev
)
1921 dsl_dataset_rele(ds_prev
, FTAG
);
1923 spa_prop_clear_bootfs(dp
->dp_spa
, ds
->ds_object
, tx
);
1924 spa_history_log_internal(LOG_DS_DESTROY
, dp
->dp_spa
, tx
,
1925 "dataset = %llu", ds
->ds_object
);
1927 if (ds
->ds_phys
->ds_next_clones_obj
!= 0) {
1928 ASSERTV(uint64_t count
);
1929 ASSERT(0 == zap_count(mos
,
1930 ds
->ds_phys
->ds_next_clones_obj
, &count
) && count
== 0);
1931 VERIFY(0 == dmu_object_free(mos
,
1932 ds
->ds_phys
->ds_next_clones_obj
, tx
));
1934 if (ds
->ds_phys
->ds_props_obj
!= 0)
1935 VERIFY(0 == zap_destroy(mos
, ds
->ds_phys
->ds_props_obj
, tx
));
1936 if (ds
->ds_phys
->ds_userrefs_obj
!= 0)
1937 VERIFY(0 == zap_destroy(mos
, ds
->ds_phys
->ds_userrefs_obj
, tx
));
1938 dsl_dir_close(ds
->ds_dir
, ds
);
1940 dsl_dataset_drain_refs(ds
, tag
);
1941 VERIFY(0 == dmu_object_free(mos
, obj
, tx
));
1943 if (dsda
->rm_origin
) {
1945 * Remove the origin of the clone we just destroyed.
1947 struct dsl_ds_destroyarg ndsda
= {0};
1949 ndsda
.ds
= dsda
->rm_origin
;
1950 dsl_dataset_destroy_sync(&ndsda
, tag
, tx
);
1955 dsl_dataset_snapshot_reserve_space(dsl_dataset_t
*ds
, dmu_tx_t
*tx
)
1959 if (!dmu_tx_is_syncing(tx
))
1963 * If there's an fs-only reservation, any blocks that might become
1964 * owned by the snapshot dataset must be accommodated by space
1965 * outside of the reservation.
1967 ASSERT(ds
->ds_reserved
== 0 || DS_UNIQUE_IS_ACCURATE(ds
));
1968 asize
= MIN(ds
->ds_phys
->ds_unique_bytes
, ds
->ds_reserved
);
1969 if (asize
> dsl_dir_space_available(ds
->ds_dir
, NULL
, 0, TRUE
))
1973 * Propogate any reserved space for this snapshot to other
1974 * snapshot checks in this sync group.
1977 dsl_dir_willuse_space(ds
->ds_dir
, asize
, tx
);
1983 dsl_dataset_snapshot_check(void *arg1
, void *arg2
, dmu_tx_t
*tx
)
1985 dsl_dataset_t
*ds
= arg1
;
1986 const char *snapname
= arg2
;
1991 * We don't allow multiple snapshots of the same txg. If there
1992 * is already one, try again.
1994 if (ds
->ds_phys
->ds_prev_snap_txg
>= tx
->tx_txg
)
1998 * Check for conflicting name snapshot name.
2000 err
= dsl_dataset_snap_lookup(ds
, snapname
, &value
);
2007 * Check that the dataset's name is not too long. Name consists
2008 * of the dataset's length + 1 for the @-sign + snapshot name's length
2010 if (dsl_dataset_namelen(ds
) + 1 + strlen(snapname
) >= MAXNAMELEN
)
2011 return (ENAMETOOLONG
);
2013 err
= dsl_dataset_snapshot_reserve_space(ds
, tx
);
2017 ds
->ds_trysnap_txg
= tx
->tx_txg
;
2022 dsl_dataset_snapshot_sync(void *arg1
, void *arg2
, dmu_tx_t
*tx
)
2024 dsl_dataset_t
*ds
= arg1
;
2025 const char *snapname
= arg2
;
2026 dsl_pool_t
*dp
= ds
->ds_dir
->dd_pool
;
2028 dsl_dataset_phys_t
*dsphys
;
2029 uint64_t dsobj
, crtxg
;
2030 objset_t
*mos
= dp
->dp_meta_objset
;
2033 ASSERT(RW_WRITE_HELD(&dp
->dp_config_rwlock
));
2036 * The origin's ds_creation_txg has to be < TXG_INITIAL
2038 if (strcmp(snapname
, ORIGIN_DIR_NAME
) == 0)
2043 dsobj
= dmu_object_alloc(mos
, DMU_OT_DSL_DATASET
, 0,
2044 DMU_OT_DSL_DATASET
, sizeof (dsl_dataset_phys_t
), tx
);
2045 VERIFY(0 == dmu_bonus_hold(mos
, dsobj
, FTAG
, &dbuf
));
2046 dmu_buf_will_dirty(dbuf
, tx
);
2047 dsphys
= dbuf
->db_data
;
2048 bzero(dsphys
, sizeof (dsl_dataset_phys_t
));
2049 dsphys
->ds_dir_obj
= ds
->ds_dir
->dd_object
;
2050 dsphys
->ds_fsid_guid
= unique_create();
2051 (void) random_get_pseudo_bytes((void*)&dsphys
->ds_guid
,
2052 sizeof (dsphys
->ds_guid
));
2053 dsphys
->ds_prev_snap_obj
= ds
->ds_phys
->ds_prev_snap_obj
;
2054 dsphys
->ds_prev_snap_txg
= ds
->ds_phys
->ds_prev_snap_txg
;
2055 dsphys
->ds_next_snap_obj
= ds
->ds_object
;
2056 dsphys
->ds_num_children
= 1;
2057 dsphys
->ds_creation_time
= gethrestime_sec();
2058 dsphys
->ds_creation_txg
= crtxg
;
2059 dsphys
->ds_deadlist_obj
= ds
->ds_phys
->ds_deadlist_obj
;
2060 dsphys
->ds_used_bytes
= ds
->ds_phys
->ds_used_bytes
;
2061 dsphys
->ds_compressed_bytes
= ds
->ds_phys
->ds_compressed_bytes
;
2062 dsphys
->ds_uncompressed_bytes
= ds
->ds_phys
->ds_uncompressed_bytes
;
2063 dsphys
->ds_flags
= ds
->ds_phys
->ds_flags
;
2064 dsphys
->ds_bp
= ds
->ds_phys
->ds_bp
;
2065 dmu_buf_rele(dbuf
, FTAG
);
2067 ASSERT3U(ds
->ds_prev
!= 0, ==, ds
->ds_phys
->ds_prev_snap_obj
!= 0);
2069 uint64_t next_clones_obj
=
2070 ds
->ds_prev
->ds_phys
->ds_next_clones_obj
;
2071 ASSERT(ds
->ds_prev
->ds_phys
->ds_next_snap_obj
==
2073 ds
->ds_prev
->ds_phys
->ds_num_children
> 1);
2074 if (ds
->ds_prev
->ds_phys
->ds_next_snap_obj
== ds
->ds_object
) {
2075 dmu_buf_will_dirty(ds
->ds_prev
->ds_dbuf
, tx
);
2076 ASSERT3U(ds
->ds_phys
->ds_prev_snap_txg
, ==,
2077 ds
->ds_prev
->ds_phys
->ds_creation_txg
);
2078 ds
->ds_prev
->ds_phys
->ds_next_snap_obj
= dsobj
;
2079 } else if (next_clones_obj
!= 0) {
2080 remove_from_next_clones(ds
->ds_prev
,
2081 dsphys
->ds_next_snap_obj
, tx
);
2082 VERIFY3U(0, ==, zap_add_int(mos
,
2083 next_clones_obj
, dsobj
, tx
));
2088 * If we have a reference-reservation on this dataset, we will
2089 * need to increase the amount of refreservation being charged
2090 * since our unique space is going to zero.
2092 if (ds
->ds_reserved
) {
2094 ASSERT(DS_UNIQUE_IS_ACCURATE(ds
));
2095 delta
= MIN(ds
->ds_phys
->ds_unique_bytes
, ds
->ds_reserved
);
2096 dsl_dir_diduse_space(ds
->ds_dir
, DD_USED_REFRSRV
,
2100 dmu_buf_will_dirty(ds
->ds_dbuf
, tx
);
2101 zfs_dbgmsg("taking snapshot %s@%s/%llu; newkey=%llu",
2102 ds
->ds_dir
->dd_myname
, snapname
, dsobj
,
2103 ds
->ds_phys
->ds_prev_snap_txg
);
2104 ds
->ds_phys
->ds_deadlist_obj
= dsl_deadlist_clone(&ds
->ds_deadlist
,
2105 UINT64_MAX
, ds
->ds_phys
->ds_prev_snap_obj
, tx
);
2106 dsl_deadlist_close(&ds
->ds_deadlist
);
2107 dsl_deadlist_open(&ds
->ds_deadlist
, mos
, ds
->ds_phys
->ds_deadlist_obj
);
2108 dsl_deadlist_add_key(&ds
->ds_deadlist
,
2109 ds
->ds_phys
->ds_prev_snap_txg
, tx
);
2111 ASSERT3U(ds
->ds_phys
->ds_prev_snap_txg
, <, tx
->tx_txg
);
2112 ds
->ds_phys
->ds_prev_snap_obj
= dsobj
;
2113 ds
->ds_phys
->ds_prev_snap_txg
= crtxg
;
2114 ds
->ds_phys
->ds_unique_bytes
= 0;
2115 if (spa_version(dp
->dp_spa
) >= SPA_VERSION_UNIQUE_ACCURATE
)
2116 ds
->ds_phys
->ds_flags
|= DS_FLAG_UNIQUE_ACCURATE
;
2118 err
= zap_add(mos
, ds
->ds_phys
->ds_snapnames_zapobj
,
2119 snapname
, 8, 1, &dsobj
, tx
);
2123 dsl_dataset_drop_ref(ds
->ds_prev
, ds
);
2124 VERIFY(0 == dsl_dataset_get_ref(dp
,
2125 ds
->ds_phys
->ds_prev_snap_obj
, ds
, &ds
->ds_prev
));
2127 dsl_scan_ds_snapshotted(ds
, tx
);
2129 dsl_dir_snap_cmtime_update(ds
->ds_dir
);
2131 spa_history_log_internal(LOG_DS_SNAPSHOT
, dp
->dp_spa
, tx
,
2132 "dataset = %llu", dsobj
);
2136 dsl_dataset_sync(dsl_dataset_t
*ds
, zio_t
*zio
, dmu_tx_t
*tx
)
2138 ASSERT(dmu_tx_is_syncing(tx
));
2139 ASSERT(ds
->ds_objset
!= NULL
);
2140 ASSERT(ds
->ds_phys
->ds_next_snap_obj
== 0);
2143 * in case we had to change ds_fsid_guid when we opened it,
2146 dmu_buf_will_dirty(ds
->ds_dbuf
, tx
);
2147 ds
->ds_phys
->ds_fsid_guid
= ds
->ds_fsid_guid
;
2149 dsl_dir_dirty(ds
->ds_dir
, tx
);
2150 dmu_objset_sync(ds
->ds_objset
, zio
, tx
);
2154 dsl_dataset_stats(dsl_dataset_t
*ds
, nvlist_t
*nv
)
2156 uint64_t refd
, avail
, uobjs
, aobjs
;
2158 dsl_dir_stats(ds
->ds_dir
, nv
);
2160 dsl_dataset_space(ds
, &refd
, &avail
, &uobjs
, &aobjs
);
2161 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_AVAILABLE
, avail
);
2162 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_REFERENCED
, refd
);
2164 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_CREATION
,
2165 ds
->ds_phys
->ds_creation_time
);
2166 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_CREATETXG
,
2167 ds
->ds_phys
->ds_creation_txg
);
2168 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_REFQUOTA
,
2170 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_REFRESERVATION
,
2172 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_GUID
,
2173 ds
->ds_phys
->ds_guid
);
2174 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_UNIQUE
,
2175 ds
->ds_phys
->ds_unique_bytes
);
2176 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_OBJSETID
,
2178 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_USERREFS
,
2180 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_DEFER_DESTROY
,
2181 DS_IS_DEFER_DESTROY(ds
) ? 1 : 0);
2183 if (ds
->ds_phys
->ds_next_snap_obj
) {
2185 * This is a snapshot; override the dd's space used with
2186 * our unique space and compression ratio.
2188 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_USED
,
2189 ds
->ds_phys
->ds_unique_bytes
);
2190 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_COMPRESSRATIO
,
2191 ds
->ds_phys
->ds_compressed_bytes
== 0 ? 100 :
2192 (ds
->ds_phys
->ds_uncompressed_bytes
* 100 /
2193 ds
->ds_phys
->ds_compressed_bytes
));
2198 dsl_dataset_fast_stat(dsl_dataset_t
*ds
, dmu_objset_stats_t
*stat
)
2200 stat
->dds_creation_txg
= ds
->ds_phys
->ds_creation_txg
;
2201 stat
->dds_inconsistent
= ds
->ds_phys
->ds_flags
& DS_FLAG_INCONSISTENT
;
2202 stat
->dds_guid
= ds
->ds_phys
->ds_guid
;
2203 if (ds
->ds_phys
->ds_next_snap_obj
) {
2204 stat
->dds_is_snapshot
= B_TRUE
;
2205 stat
->dds_num_clones
= ds
->ds_phys
->ds_num_children
- 1;
2207 stat
->dds_is_snapshot
= B_FALSE
;
2208 stat
->dds_num_clones
= 0;
2211 /* clone origin is really a dsl_dir thing... */
2212 rw_enter(&ds
->ds_dir
->dd_pool
->dp_config_rwlock
, RW_READER
);
2213 if (dsl_dir_is_clone(ds
->ds_dir
)) {
2216 VERIFY(0 == dsl_dataset_get_ref(ds
->ds_dir
->dd_pool
,
2217 ds
->ds_dir
->dd_phys
->dd_origin_obj
, FTAG
, &ods
));
2218 dsl_dataset_name(ods
, stat
->dds_origin
);
2219 dsl_dataset_drop_ref(ods
, FTAG
);
2221 stat
->dds_origin
[0] = '\0';
2223 rw_exit(&ds
->ds_dir
->dd_pool
->dp_config_rwlock
);
2227 dsl_dataset_fsid_guid(dsl_dataset_t
*ds
)
2229 return (ds
->ds_fsid_guid
);
2233 dsl_dataset_space(dsl_dataset_t
*ds
,
2234 uint64_t *refdbytesp
, uint64_t *availbytesp
,
2235 uint64_t *usedobjsp
, uint64_t *availobjsp
)
2237 *refdbytesp
= ds
->ds_phys
->ds_used_bytes
;
2238 *availbytesp
= dsl_dir_space_available(ds
->ds_dir
, NULL
, 0, TRUE
);
2239 if (ds
->ds_reserved
> ds
->ds_phys
->ds_unique_bytes
)
2240 *availbytesp
+= ds
->ds_reserved
- ds
->ds_phys
->ds_unique_bytes
;
2241 if (ds
->ds_quota
!= 0) {
2243 * Adjust available bytes according to refquota
2245 if (*refdbytesp
< ds
->ds_quota
)
2246 *availbytesp
= MIN(*availbytesp
,
2247 ds
->ds_quota
- *refdbytesp
);
2251 *usedobjsp
= ds
->ds_phys
->ds_bp
.blk_fill
;
2252 *availobjsp
= DN_MAX_OBJECT
- *usedobjsp
;
2256 dsl_dataset_modified_since_lastsnap(dsl_dataset_t
*ds
)
2258 ASSERTV(dsl_pool_t
*dp
= ds
->ds_dir
->dd_pool
);
2260 ASSERT(RW_LOCK_HELD(&dp
->dp_config_rwlock
) ||
2261 dsl_pool_sync_context(dp
));
2262 if (ds
->ds_prev
== NULL
)
2264 if (ds
->ds_phys
->ds_bp
.blk_birth
>
2265 ds
->ds_prev
->ds_phys
->ds_creation_txg
) {
2266 objset_t
*os
, *os_prev
;
2268 * It may be that only the ZIL differs, because it was
2269 * reset in the head. Don't count that as being
2272 if (dmu_objset_from_ds(ds
, &os
) != 0)
2274 if (dmu_objset_from_ds(ds
->ds_prev
, &os_prev
) != 0)
2276 return (bcmp(&os
->os_phys
->os_meta_dnode
,
2277 &os_prev
->os_phys
->os_meta_dnode
,
2278 sizeof (os
->os_phys
->os_meta_dnode
)) != 0);
2285 dsl_dataset_snapshot_rename_check(void *arg1
, void *arg2
, dmu_tx_t
*tx
)
2287 dsl_dataset_t
*ds
= arg1
;
2288 char *newsnapname
= arg2
;
2289 dsl_dir_t
*dd
= ds
->ds_dir
;
2294 err
= dsl_dataset_hold_obj(dd
->dd_pool
,
2295 dd
->dd_phys
->dd_head_dataset_obj
, FTAG
, &hds
);
2299 /* new name better not be in use */
2300 err
= dsl_dataset_snap_lookup(hds
, newsnapname
, &val
);
2301 dsl_dataset_rele(hds
, FTAG
);
2305 else if (err
== ENOENT
)
2308 /* dataset name + 1 for the "@" + the new snapshot name must fit */
2309 if (dsl_dir_namelen(ds
->ds_dir
) + 1 + strlen(newsnapname
) >= MAXNAMELEN
)
2316 dsl_dataset_snapshot_rename_sync(void *arg1
, void *arg2
, dmu_tx_t
*tx
)
2318 dsl_dataset_t
*ds
= arg1
;
2319 const char *newsnapname
= arg2
;
2320 dsl_dir_t
*dd
= ds
->ds_dir
;
2321 objset_t
*mos
= dd
->dd_pool
->dp_meta_objset
;
2325 ASSERT(ds
->ds_phys
->ds_next_snap_obj
!= 0);
2327 VERIFY(0 == dsl_dataset_hold_obj(dd
->dd_pool
,
2328 dd
->dd_phys
->dd_head_dataset_obj
, FTAG
, &hds
));
2330 VERIFY(0 == dsl_dataset_get_snapname(ds
));
2331 err
= dsl_dataset_snap_remove(hds
, ds
->ds_snapname
, tx
);
2332 ASSERT3U(err
, ==, 0);
2333 mutex_enter(&ds
->ds_lock
);
2334 (void) strcpy(ds
->ds_snapname
, newsnapname
);
2335 mutex_exit(&ds
->ds_lock
);
2336 err
= zap_add(mos
, hds
->ds_phys
->ds_snapnames_zapobj
,
2337 ds
->ds_snapname
, 8, 1, &ds
->ds_object
, tx
);
2338 ASSERT3U(err
, ==, 0);
2340 spa_history_log_internal(LOG_DS_RENAME
, dd
->dd_pool
->dp_spa
, tx
,
2341 "dataset = %llu", ds
->ds_object
);
2342 dsl_dataset_rele(hds
, FTAG
);
2345 struct renamesnaparg
{
2346 dsl_sync_task_group_t
*dstg
;
2347 char failed
[MAXPATHLEN
];
2353 dsl_snapshot_rename_one(const char *name
, void *arg
)
2355 struct renamesnaparg
*ra
= arg
;
2356 dsl_dataset_t
*ds
= NULL
;
2360 snapname
= kmem_asprintf("%s@%s", name
, ra
->oldsnap
);
2361 (void) strlcpy(ra
->failed
, snapname
, sizeof (ra
->failed
));
2364 * For recursive snapshot renames the parent won't be changing
2365 * so we just pass name for both the to/from argument.
2367 err
= zfs_secpolicy_rename_perms(snapname
, snapname
, CRED());
2370 return (err
== ENOENT
? 0 : err
);
2375 * For all filesystems undergoing rename, we'll need to unmount it.
2377 (void) zfs_unmount_snap(snapname
, NULL
);
2379 err
= dsl_dataset_hold(snapname
, ra
->dstg
, &ds
);
2382 return (err
== ENOENT
? 0 : err
);
2384 dsl_sync_task_create(ra
->dstg
, dsl_dataset_snapshot_rename_check
,
2385 dsl_dataset_snapshot_rename_sync
, ds
, ra
->newsnap
, 0);
2391 dsl_recursive_rename(char *oldname
, const char *newname
)
2394 struct renamesnaparg
*ra
;
2395 dsl_sync_task_t
*dst
;
2397 char *cp
, *fsname
= spa_strdup(oldname
);
2398 int len
= strlen(oldname
) + 1;
2400 /* truncate the snapshot name to get the fsname */
2401 cp
= strchr(fsname
, '@');
2404 err
= spa_open(fsname
, &spa
, FTAG
);
2406 kmem_free(fsname
, len
);
2409 ra
= kmem_alloc(sizeof (struct renamesnaparg
), KM_SLEEP
);
2410 ra
->dstg
= dsl_sync_task_group_create(spa_get_dsl(spa
));
2412 ra
->oldsnap
= strchr(oldname
, '@') + 1;
2413 ra
->newsnap
= strchr(newname
, '@') + 1;
2416 err
= dmu_objset_find(fsname
, dsl_snapshot_rename_one
, ra
,
2418 kmem_free(fsname
, len
);
2421 err
= dsl_sync_task_group_wait(ra
->dstg
);
2424 for (dst
= list_head(&ra
->dstg
->dstg_tasks
); dst
;
2425 dst
= list_next(&ra
->dstg
->dstg_tasks
, dst
)) {
2426 dsl_dataset_t
*ds
= dst
->dst_arg1
;
2428 dsl_dir_name(ds
->ds_dir
, ra
->failed
);
2429 (void) strlcat(ra
->failed
, "@", sizeof (ra
->failed
));
2430 (void) strlcat(ra
->failed
, ra
->newsnap
,
2431 sizeof (ra
->failed
));
2433 dsl_dataset_rele(ds
, ra
->dstg
);
2437 (void) strlcpy(oldname
, ra
->failed
, sizeof (ra
->failed
));
2439 dsl_sync_task_group_destroy(ra
->dstg
);
2440 kmem_free(ra
, sizeof (struct renamesnaparg
));
2441 spa_close(spa
, FTAG
);
2446 dsl_valid_rename(const char *oldname
, void *arg
)
2448 int delta
= *(int *)arg
;
2450 if (strlen(oldname
) + delta
>= MAXNAMELEN
)
2451 return (ENAMETOOLONG
);
2456 #pragma weak dmu_objset_rename = dsl_dataset_rename
2458 dsl_dataset_rename(char *oldname
, const char *newname
, boolean_t recursive
)
2465 err
= dsl_dir_open(oldname
, FTAG
, &dd
, &tail
);
2470 int delta
= strlen(newname
) - strlen(oldname
);
2472 /* if we're growing, validate child name lengths */
2474 err
= dmu_objset_find(oldname
, dsl_valid_rename
,
2475 &delta
, DS_FIND_CHILDREN
| DS_FIND_SNAPSHOTS
);
2478 err
= dsl_dir_rename(dd
, newname
);
2479 dsl_dir_close(dd
, FTAG
);
2483 if (tail
[0] != '@') {
2484 /* the name ended in a nonexistent component */
2485 dsl_dir_close(dd
, FTAG
);
2489 dsl_dir_close(dd
, FTAG
);
2491 /* new name must be snapshot in same filesystem */
2492 tail
= strchr(newname
, '@');
2496 if (strncmp(oldname
, newname
, tail
- newname
) != 0)
2500 err
= dsl_recursive_rename(oldname
, newname
);
2502 err
= dsl_dataset_hold(oldname
, FTAG
, &ds
);
2506 err
= dsl_sync_task_do(ds
->ds_dir
->dd_pool
,
2507 dsl_dataset_snapshot_rename_check
,
2508 dsl_dataset_snapshot_rename_sync
, ds
, (char *)tail
, 1);
2510 dsl_dataset_rele(ds
, FTAG
);
2516 struct promotenode
{
2522 list_t shared_snaps
, origin_snaps
, clone_snaps
;
2523 dsl_dataset_t
*origin_origin
;
2524 uint64_t used
, comp
, uncomp
, unique
, cloneusedsnap
, originusedsnap
;
2528 static int snaplist_space(list_t
*l
, uint64_t mintxg
, uint64_t *spacep
);
2531 dsl_dataset_promote_check(void *arg1
, void *arg2
, dmu_tx_t
*tx
)
2533 dsl_dataset_t
*hds
= arg1
;
2534 struct promotearg
*pa
= arg2
;
2535 struct promotenode
*snap
= list_head(&pa
->shared_snaps
);
2536 dsl_dataset_t
*origin_ds
= snap
->ds
;
2540 /* Check that it is a real clone */
2541 if (!dsl_dir_is_clone(hds
->ds_dir
))
2544 /* Since this is so expensive, don't do the preliminary check */
2545 if (!dmu_tx_is_syncing(tx
))
2548 if (hds
->ds_phys
->ds_flags
& DS_FLAG_NOPROMOTE
)
2551 /* compute origin's new unique space */
2552 snap
= list_tail(&pa
->clone_snaps
);
2553 ASSERT3U(snap
->ds
->ds_phys
->ds_prev_snap_obj
, ==, origin_ds
->ds_object
);
2554 dsl_deadlist_space_range(&snap
->ds
->ds_deadlist
,
2555 origin_ds
->ds_phys
->ds_prev_snap_txg
, UINT64_MAX
,
2556 &pa
->unique
, &unused
, &unused
);
2559 * Walk the snapshots that we are moving
2561 * Compute space to transfer. Consider the incremental changes
2562 * to used for each snapshot:
2563 * (my used) = (prev's used) + (blocks born) - (blocks killed)
2564 * So each snapshot gave birth to:
2565 * (blocks born) = (my used) - (prev's used) + (blocks killed)
2566 * So a sequence would look like:
2567 * (uN - u(N-1) + kN) + ... + (u1 - u0 + k1) + (u0 - 0 + k0)
2568 * Which simplifies to:
2569 * uN + kN + kN-1 + ... + k1 + k0
2570 * Note however, if we stop before we reach the ORIGIN we get:
2571 * uN + kN + kN-1 + ... + kM - uM-1
2573 pa
->used
= origin_ds
->ds_phys
->ds_used_bytes
;
2574 pa
->comp
= origin_ds
->ds_phys
->ds_compressed_bytes
;
2575 pa
->uncomp
= origin_ds
->ds_phys
->ds_uncompressed_bytes
;
2576 for (snap
= list_head(&pa
->shared_snaps
); snap
;
2577 snap
= list_next(&pa
->shared_snaps
, snap
)) {
2578 uint64_t val
, dlused
, dlcomp
, dluncomp
;
2579 dsl_dataset_t
*ds
= snap
->ds
;
2581 /* Check that the snapshot name does not conflict */
2582 VERIFY(0 == dsl_dataset_get_snapname(ds
));
2583 err
= dsl_dataset_snap_lookup(hds
, ds
->ds_snapname
, &val
);
2591 /* The very first snapshot does not have a deadlist */
2592 if (ds
->ds_phys
->ds_prev_snap_obj
== 0)
2595 dsl_deadlist_space(&ds
->ds_deadlist
,
2596 &dlused
, &dlcomp
, &dluncomp
);
2599 pa
->uncomp
+= dluncomp
;
2603 * If we are a clone of a clone then we never reached ORIGIN,
2604 * so we need to subtract out the clone origin's used space.
2606 if (pa
->origin_origin
) {
2607 pa
->used
-= pa
->origin_origin
->ds_phys
->ds_used_bytes
;
2608 pa
->comp
-= pa
->origin_origin
->ds_phys
->ds_compressed_bytes
;
2609 pa
->uncomp
-= pa
->origin_origin
->ds_phys
->ds_uncompressed_bytes
;
2612 /* Check that there is enough space here */
2613 err
= dsl_dir_transfer_possible(origin_ds
->ds_dir
, hds
->ds_dir
,
2619 * Compute the amounts of space that will be used by snapshots
2620 * after the promotion (for both origin and clone). For each,
2621 * it is the amount of space that will be on all of their
2622 * deadlists (that was not born before their new origin).
2624 if (hds
->ds_dir
->dd_phys
->dd_flags
& DD_FLAG_USED_BREAKDOWN
) {
2628 * Note, typically this will not be a clone of a clone,
2629 * so dd_origin_txg will be < TXG_INITIAL, so
2630 * these snaplist_space() -> dsl_deadlist_space_range()
2631 * calls will be fast because they do not have to
2632 * iterate over all bps.
2634 snap
= list_head(&pa
->origin_snaps
);
2635 err
= snaplist_space(&pa
->shared_snaps
,
2636 snap
->ds
->ds_dir
->dd_origin_txg
, &pa
->cloneusedsnap
);
2640 err
= snaplist_space(&pa
->clone_snaps
,
2641 snap
->ds
->ds_dir
->dd_origin_txg
, &space
);
2644 pa
->cloneusedsnap
+= space
;
2646 if (origin_ds
->ds_dir
->dd_phys
->dd_flags
& DD_FLAG_USED_BREAKDOWN
) {
2647 err
= snaplist_space(&pa
->origin_snaps
,
2648 origin_ds
->ds_phys
->ds_creation_txg
, &pa
->originusedsnap
);
2655 pa
->err_ds
= snap
->ds
->ds_snapname
;
2660 dsl_dataset_promote_sync(void *arg1
, void *arg2
, dmu_tx_t
*tx
)
2662 dsl_dataset_t
*hds
= arg1
;
2663 struct promotearg
*pa
= arg2
;
2664 struct promotenode
*snap
= list_head(&pa
->shared_snaps
);
2665 dsl_dataset_t
*origin_ds
= snap
->ds
;
2666 dsl_dataset_t
*origin_head
;
2667 dsl_dir_t
*dd
= hds
->ds_dir
;
2668 dsl_pool_t
*dp
= hds
->ds_dir
->dd_pool
;
2669 dsl_dir_t
*odd
= NULL
;
2670 uint64_t oldnext_obj
;
2673 ASSERT(0 == (hds
->ds_phys
->ds_flags
& DS_FLAG_NOPROMOTE
));
2675 snap
= list_head(&pa
->origin_snaps
);
2676 origin_head
= snap
->ds
;
2679 * We need to explicitly open odd, since origin_ds's dd will be
2682 VERIFY(0 == dsl_dir_open_obj(dp
, origin_ds
->ds_dir
->dd_object
,
2685 /* change origin's next snap */
2686 dmu_buf_will_dirty(origin_ds
->ds_dbuf
, tx
);
2687 oldnext_obj
= origin_ds
->ds_phys
->ds_next_snap_obj
;
2688 snap
= list_tail(&pa
->clone_snaps
);
2689 ASSERT3U(snap
->ds
->ds_phys
->ds_prev_snap_obj
, ==, origin_ds
->ds_object
);
2690 origin_ds
->ds_phys
->ds_next_snap_obj
= snap
->ds
->ds_object
;
2692 /* change the origin's next clone */
2693 if (origin_ds
->ds_phys
->ds_next_clones_obj
) {
2694 remove_from_next_clones(origin_ds
, snap
->ds
->ds_object
, tx
);
2695 VERIFY3U(0, ==, zap_add_int(dp
->dp_meta_objset
,
2696 origin_ds
->ds_phys
->ds_next_clones_obj
,
2701 dmu_buf_will_dirty(dd
->dd_dbuf
, tx
);
2702 ASSERT3U(dd
->dd_phys
->dd_origin_obj
, ==, origin_ds
->ds_object
);
2703 dd
->dd_phys
->dd_origin_obj
= odd
->dd_phys
->dd_origin_obj
;
2704 dd
->dd_origin_txg
= origin_head
->ds_dir
->dd_origin_txg
;
2705 dmu_buf_will_dirty(odd
->dd_dbuf
, tx
);
2706 odd
->dd_phys
->dd_origin_obj
= origin_ds
->ds_object
;
2707 origin_head
->ds_dir
->dd_origin_txg
=
2708 origin_ds
->ds_phys
->ds_creation_txg
;
2710 /* change dd_clone entries */
2711 if (spa_version(dp
->dp_spa
) >= SPA_VERSION_DIR_CLONES
) {
2712 VERIFY3U(0, ==, zap_remove_int(dp
->dp_meta_objset
,
2713 odd
->dd_phys
->dd_clones
, hds
->ds_object
, tx
));
2714 VERIFY3U(0, ==, zap_add_int(dp
->dp_meta_objset
,
2715 pa
->origin_origin
->ds_dir
->dd_phys
->dd_clones
,
2716 hds
->ds_object
, tx
));
2718 VERIFY3U(0, ==, zap_remove_int(dp
->dp_meta_objset
,
2719 pa
->origin_origin
->ds_dir
->dd_phys
->dd_clones
,
2720 origin_head
->ds_object
, tx
));
2721 if (dd
->dd_phys
->dd_clones
== 0) {
2722 dd
->dd_phys
->dd_clones
= zap_create(dp
->dp_meta_objset
,
2723 DMU_OT_DSL_CLONES
, DMU_OT_NONE
, 0, tx
);
2725 VERIFY3U(0, ==, zap_add_int(dp
->dp_meta_objset
,
2726 dd
->dd_phys
->dd_clones
, origin_head
->ds_object
, tx
));
2730 /* move snapshots to this dir */
2731 for (snap
= list_head(&pa
->shared_snaps
); snap
;
2732 snap
= list_next(&pa
->shared_snaps
, snap
)) {
2733 dsl_dataset_t
*ds
= snap
->ds
;
2735 /* unregister props as dsl_dir is changing */
2736 if (ds
->ds_objset
) {
2737 dmu_objset_evict(ds
->ds_objset
);
2738 ds
->ds_objset
= NULL
;
2740 /* move snap name entry */
2741 VERIFY(0 == dsl_dataset_get_snapname(ds
));
2742 VERIFY(0 == dsl_dataset_snap_remove(origin_head
,
2743 ds
->ds_snapname
, tx
));
2744 VERIFY(0 == zap_add(dp
->dp_meta_objset
,
2745 hds
->ds_phys
->ds_snapnames_zapobj
, ds
->ds_snapname
,
2746 8, 1, &ds
->ds_object
, tx
));
2748 /* change containing dsl_dir */
2749 dmu_buf_will_dirty(ds
->ds_dbuf
, tx
);
2750 ASSERT3U(ds
->ds_phys
->ds_dir_obj
, ==, odd
->dd_object
);
2751 ds
->ds_phys
->ds_dir_obj
= dd
->dd_object
;
2752 ASSERT3P(ds
->ds_dir
, ==, odd
);
2753 dsl_dir_close(ds
->ds_dir
, ds
);
2754 VERIFY(0 == dsl_dir_open_obj(dp
, dd
->dd_object
,
2755 NULL
, ds
, &ds
->ds_dir
));
2757 /* move any clone references */
2758 if (ds
->ds_phys
->ds_next_clones_obj
&&
2759 spa_version(dp
->dp_spa
) >= SPA_VERSION_DIR_CLONES
) {
2763 for (zap_cursor_init(&zc
, dp
->dp_meta_objset
,
2764 ds
->ds_phys
->ds_next_clones_obj
);
2765 zap_cursor_retrieve(&zc
, &za
) == 0;
2766 zap_cursor_advance(&zc
)) {
2767 dsl_dataset_t
*cnds
;
2770 if (za
.za_first_integer
== oldnext_obj
) {
2772 * We've already moved the
2773 * origin's reference.
2778 VERIFY3U(0, ==, dsl_dataset_hold_obj(dp
,
2779 za
.za_first_integer
, FTAG
, &cnds
));
2780 o
= cnds
->ds_dir
->dd_phys
->dd_head_dataset_obj
;
2782 VERIFY3U(zap_remove_int(dp
->dp_meta_objset
,
2783 odd
->dd_phys
->dd_clones
, o
, tx
), ==, 0);
2784 VERIFY3U(zap_add_int(dp
->dp_meta_objset
,
2785 dd
->dd_phys
->dd_clones
, o
, tx
), ==, 0);
2786 dsl_dataset_rele(cnds
, FTAG
);
2788 zap_cursor_fini(&zc
);
2791 ASSERT3U(dsl_prop_numcb(ds
), ==, 0);
2795 * Change space accounting.
2796 * Note, pa->*usedsnap and dd_used_breakdown[SNAP] will either
2797 * both be valid, or both be 0 (resulting in delta == 0). This
2798 * is true for each of {clone,origin} independently.
2801 delta
= pa
->cloneusedsnap
-
2802 dd
->dd_phys
->dd_used_breakdown
[DD_USED_SNAP
];
2803 ASSERT3S(delta
, >=, 0);
2804 ASSERT3U(pa
->used
, >=, delta
);
2805 dsl_dir_diduse_space(dd
, DD_USED_SNAP
, delta
, 0, 0, tx
);
2806 dsl_dir_diduse_space(dd
, DD_USED_HEAD
,
2807 pa
->used
- delta
, pa
->comp
, pa
->uncomp
, tx
);
2809 delta
= pa
->originusedsnap
-
2810 odd
->dd_phys
->dd_used_breakdown
[DD_USED_SNAP
];
2811 ASSERT3S(delta
, <=, 0);
2812 ASSERT3U(pa
->used
, >=, -delta
);
2813 dsl_dir_diduse_space(odd
, DD_USED_SNAP
, delta
, 0, 0, tx
);
2814 dsl_dir_diduse_space(odd
, DD_USED_HEAD
,
2815 -pa
->used
- delta
, -pa
->comp
, -pa
->uncomp
, tx
);
2817 origin_ds
->ds_phys
->ds_unique_bytes
= pa
->unique
;
2819 /* log history record */
2820 spa_history_log_internal(LOG_DS_PROMOTE
, dd
->dd_pool
->dp_spa
, tx
,
2821 "dataset = %llu", hds
->ds_object
);
2823 dsl_dir_close(odd
, FTAG
);
2826 static char *snaplist_tag
= "snaplist";
2828 * Make a list of dsl_dataset_t's for the snapshots between first_obj
2829 * (exclusive) and last_obj (inclusive). The list will be in reverse
2830 * order (last_obj will be the list_head()). If first_obj == 0, do all
2831 * snapshots back to this dataset's origin.
2834 snaplist_make(dsl_pool_t
*dp
, boolean_t own
,
2835 uint64_t first_obj
, uint64_t last_obj
, list_t
*l
)
2837 uint64_t obj
= last_obj
;
2839 ASSERT(RW_LOCK_HELD(&dp
->dp_config_rwlock
));
2841 list_create(l
, sizeof (struct promotenode
),
2842 offsetof(struct promotenode
, link
));
2844 while (obj
!= first_obj
) {
2846 struct promotenode
*snap
;
2850 err
= dsl_dataset_own_obj(dp
, obj
,
2851 0, snaplist_tag
, &ds
);
2853 dsl_dataset_make_exclusive(ds
, snaplist_tag
);
2855 err
= dsl_dataset_hold_obj(dp
, obj
, snaplist_tag
, &ds
);
2857 if (err
== ENOENT
) {
2858 /* lost race with snapshot destroy */
2859 struct promotenode
*last
= list_tail(l
);
2860 ASSERT(obj
!= last
->ds
->ds_phys
->ds_prev_snap_obj
);
2861 obj
= last
->ds
->ds_phys
->ds_prev_snap_obj
;
2868 first_obj
= ds
->ds_dir
->dd_phys
->dd_origin_obj
;
2870 snap
= kmem_alloc(sizeof (struct promotenode
), KM_SLEEP
);
2872 list_insert_tail(l
, snap
);
2873 obj
= ds
->ds_phys
->ds_prev_snap_obj
;
2880 snaplist_space(list_t
*l
, uint64_t mintxg
, uint64_t *spacep
)
2882 struct promotenode
*snap
;
2885 for (snap
= list_head(l
); snap
; snap
= list_next(l
, snap
)) {
2886 uint64_t used
, comp
, uncomp
;
2887 dsl_deadlist_space_range(&snap
->ds
->ds_deadlist
,
2888 mintxg
, UINT64_MAX
, &used
, &comp
, &uncomp
);
2895 snaplist_destroy(list_t
*l
, boolean_t own
)
2897 struct promotenode
*snap
;
2899 if (!l
|| !list_link_active(&l
->list_head
))
2902 while ((snap
= list_tail(l
)) != NULL
) {
2903 list_remove(l
, snap
);
2905 dsl_dataset_disown(snap
->ds
, snaplist_tag
);
2907 dsl_dataset_rele(snap
->ds
, snaplist_tag
);
2908 kmem_free(snap
, sizeof (struct promotenode
));
2914 * Promote a clone. Nomenclature note:
2915 * "clone" or "cds": the original clone which is being promoted
2916 * "origin" or "ods": the snapshot which is originally clone's origin
2917 * "origin head" or "ohds": the dataset which is the head
2918 * (filesystem/volume) for the origin
2919 * "origin origin": the origin of the origin's filesystem (typically
2920 * NULL, indicating that the clone is not a clone of a clone).
2923 dsl_dataset_promote(const char *name
, char *conflsnap
)
2928 dmu_object_info_t doi
;
2929 struct promotearg pa
;
2930 struct promotenode
*snap
;
2933 bzero(&pa
, sizeof(struct promotearg
));
2934 err
= dsl_dataset_hold(name
, FTAG
, &ds
);
2940 err
= dmu_object_info(dp
->dp_meta_objset
,
2941 ds
->ds_phys
->ds_snapnames_zapobj
, &doi
);
2943 dsl_dataset_rele(ds
, FTAG
);
2947 if (dsl_dataset_is_snapshot(ds
) || dd
->dd_phys
->dd_origin_obj
== 0) {
2948 dsl_dataset_rele(ds
, FTAG
);
2953 * We are going to inherit all the snapshots taken before our
2954 * origin (i.e., our new origin will be our parent's origin).
2955 * Take ownership of them so that we can rename them into our
2958 rw_enter(&dp
->dp_config_rwlock
, RW_READER
);
2960 err
= snaplist_make(dp
, B_TRUE
, 0, dd
->dd_phys
->dd_origin_obj
,
2965 err
= snaplist_make(dp
, B_FALSE
, 0, ds
->ds_object
, &pa
.clone_snaps
);
2969 snap
= list_head(&pa
.shared_snaps
);
2970 ASSERT3U(snap
->ds
->ds_object
, ==, dd
->dd_phys
->dd_origin_obj
);
2971 err
= snaplist_make(dp
, B_FALSE
, dd
->dd_phys
->dd_origin_obj
,
2972 snap
->ds
->ds_dir
->dd_phys
->dd_head_dataset_obj
, &pa
.origin_snaps
);
2976 if (snap
->ds
->ds_dir
->dd_phys
->dd_origin_obj
!= 0) {
2977 err
= dsl_dataset_hold_obj(dp
,
2978 snap
->ds
->ds_dir
->dd_phys
->dd_origin_obj
,
2979 FTAG
, &pa
.origin_origin
);
2985 rw_exit(&dp
->dp_config_rwlock
);
2988 * Add in 128x the snapnames zapobj size, since we will be moving
2989 * a bunch of snapnames to the promoted ds, and dirtying their
2993 err
= dsl_sync_task_do(dp
, dsl_dataset_promote_check
,
2994 dsl_dataset_promote_sync
, ds
, &pa
,
2995 2 + 2 * doi
.doi_physical_blocks_512
);
2996 if (err
&& pa
.err_ds
&& conflsnap
)
2997 (void) strncpy(conflsnap
, pa
.err_ds
, MAXNAMELEN
);
3000 snaplist_destroy(&pa
.shared_snaps
, B_TRUE
);
3001 snaplist_destroy(&pa
.clone_snaps
, B_FALSE
);
3002 snaplist_destroy(&pa
.origin_snaps
, B_FALSE
);
3003 if (pa
.origin_origin
)
3004 dsl_dataset_rele(pa
.origin_origin
, FTAG
);
3005 dsl_dataset_rele(ds
, FTAG
);
3009 struct cloneswaparg
{
3010 dsl_dataset_t
*cds
; /* clone dataset */
3011 dsl_dataset_t
*ohds
; /* origin's head dataset */
3013 int64_t unused_refres_delta
; /* change in unconsumed refreservation */
3018 dsl_dataset_clone_swap_check(void *arg1
, void *arg2
, dmu_tx_t
*tx
)
3020 struct cloneswaparg
*csa
= arg1
;
3022 /* they should both be heads */
3023 if (dsl_dataset_is_snapshot(csa
->cds
) ||
3024 dsl_dataset_is_snapshot(csa
->ohds
))
3027 /* the branch point should be just before them */
3028 if (csa
->cds
->ds_prev
!= csa
->ohds
->ds_prev
)
3031 /* cds should be the clone (unless they are unrelated) */
3032 if (csa
->cds
->ds_prev
!= NULL
&&
3033 csa
->cds
->ds_prev
!= csa
->cds
->ds_dir
->dd_pool
->dp_origin_snap
&&
3034 csa
->ohds
->ds_object
!=
3035 csa
->cds
->ds_prev
->ds_phys
->ds_next_snap_obj
)
3038 /* the clone should be a child of the origin */
3039 if (csa
->cds
->ds_dir
->dd_parent
!= csa
->ohds
->ds_dir
)
3042 /* ohds shouldn't be modified unless 'force' */
3043 if (!csa
->force
&& dsl_dataset_modified_since_lastsnap(csa
->ohds
))
3046 /* adjust amount of any unconsumed refreservation */
3047 csa
->unused_refres_delta
=
3048 (int64_t)MIN(csa
->ohds
->ds_reserved
,
3049 csa
->ohds
->ds_phys
->ds_unique_bytes
) -
3050 (int64_t)MIN(csa
->ohds
->ds_reserved
,
3051 csa
->cds
->ds_phys
->ds_unique_bytes
);
3053 if (csa
->unused_refres_delta
> 0 &&
3054 csa
->unused_refres_delta
>
3055 dsl_dir_space_available(csa
->ohds
->ds_dir
, NULL
, 0, TRUE
))
3058 if (csa
->ohds
->ds_quota
!= 0 &&
3059 csa
->cds
->ds_phys
->ds_unique_bytes
> csa
->ohds
->ds_quota
)
3067 dsl_dataset_clone_swap_sync(void *arg1
, void *arg2
, dmu_tx_t
*tx
)
3069 struct cloneswaparg
*csa
= arg1
;
3070 dsl_pool_t
*dp
= csa
->cds
->ds_dir
->dd_pool
;
3072 ASSERT(csa
->cds
->ds_reserved
== 0);
3073 ASSERT(csa
->ohds
->ds_quota
== 0 ||
3074 csa
->cds
->ds_phys
->ds_unique_bytes
<= csa
->ohds
->ds_quota
);
3076 dmu_buf_will_dirty(csa
->cds
->ds_dbuf
, tx
);
3077 dmu_buf_will_dirty(csa
->ohds
->ds_dbuf
, tx
);
3079 if (csa
->cds
->ds_objset
!= NULL
) {
3080 dmu_objset_evict(csa
->cds
->ds_objset
);
3081 csa
->cds
->ds_objset
= NULL
;
3084 if (csa
->ohds
->ds_objset
!= NULL
) {
3085 dmu_objset_evict(csa
->ohds
->ds_objset
);
3086 csa
->ohds
->ds_objset
= NULL
;
3090 * Reset origin's unique bytes, if it exists.
3092 if (csa
->cds
->ds_prev
) {
3093 dsl_dataset_t
*origin
= csa
->cds
->ds_prev
;
3094 uint64_t comp
, uncomp
;
3096 dmu_buf_will_dirty(origin
->ds_dbuf
, tx
);
3097 dsl_deadlist_space_range(&csa
->cds
->ds_deadlist
,
3098 origin
->ds_phys
->ds_prev_snap_txg
, UINT64_MAX
,
3099 &origin
->ds_phys
->ds_unique_bytes
, &comp
, &uncomp
);
3105 tmp
= csa
->ohds
->ds_phys
->ds_bp
;
3106 csa
->ohds
->ds_phys
->ds_bp
= csa
->cds
->ds_phys
->ds_bp
;
3107 csa
->cds
->ds_phys
->ds_bp
= tmp
;
3110 /* set dd_*_bytes */
3112 int64_t dused
, dcomp
, duncomp
;
3113 uint64_t cdl_used
, cdl_comp
, cdl_uncomp
;
3114 uint64_t odl_used
, odl_comp
, odl_uncomp
;
3116 ASSERT3U(csa
->cds
->ds_dir
->dd_phys
->
3117 dd_used_breakdown
[DD_USED_SNAP
], ==, 0);
3119 dsl_deadlist_space(&csa
->cds
->ds_deadlist
,
3120 &cdl_used
, &cdl_comp
, &cdl_uncomp
);
3121 dsl_deadlist_space(&csa
->ohds
->ds_deadlist
,
3122 &odl_used
, &odl_comp
, &odl_uncomp
);
3124 dused
= csa
->cds
->ds_phys
->ds_used_bytes
+ cdl_used
-
3125 (csa
->ohds
->ds_phys
->ds_used_bytes
+ odl_used
);
3126 dcomp
= csa
->cds
->ds_phys
->ds_compressed_bytes
+ cdl_comp
-
3127 (csa
->ohds
->ds_phys
->ds_compressed_bytes
+ odl_comp
);
3128 duncomp
= csa
->cds
->ds_phys
->ds_uncompressed_bytes
+
3130 (csa
->ohds
->ds_phys
->ds_uncompressed_bytes
+ odl_uncomp
);
3132 dsl_dir_diduse_space(csa
->ohds
->ds_dir
, DD_USED_HEAD
,
3133 dused
, dcomp
, duncomp
, tx
);
3134 dsl_dir_diduse_space(csa
->cds
->ds_dir
, DD_USED_HEAD
,
3135 -dused
, -dcomp
, -duncomp
, tx
);
3138 * The difference in the space used by snapshots is the
3139 * difference in snapshot space due to the head's
3140 * deadlist (since that's the only thing that's
3141 * changing that affects the snapused).
3143 dsl_deadlist_space_range(&csa
->cds
->ds_deadlist
,
3144 csa
->ohds
->ds_dir
->dd_origin_txg
, UINT64_MAX
,
3145 &cdl_used
, &cdl_comp
, &cdl_uncomp
);
3146 dsl_deadlist_space_range(&csa
->ohds
->ds_deadlist
,
3147 csa
->ohds
->ds_dir
->dd_origin_txg
, UINT64_MAX
,
3148 &odl_used
, &odl_comp
, &odl_uncomp
);
3149 dsl_dir_transfer_space(csa
->ohds
->ds_dir
, cdl_used
- odl_used
,
3150 DD_USED_HEAD
, DD_USED_SNAP
, tx
);
3153 /* swap ds_*_bytes */
3154 SWITCH64(csa
->ohds
->ds_phys
->ds_used_bytes
,
3155 csa
->cds
->ds_phys
->ds_used_bytes
);
3156 SWITCH64(csa
->ohds
->ds_phys
->ds_compressed_bytes
,
3157 csa
->cds
->ds_phys
->ds_compressed_bytes
);
3158 SWITCH64(csa
->ohds
->ds_phys
->ds_uncompressed_bytes
,
3159 csa
->cds
->ds_phys
->ds_uncompressed_bytes
);
3160 SWITCH64(csa
->ohds
->ds_phys
->ds_unique_bytes
,
3161 csa
->cds
->ds_phys
->ds_unique_bytes
);
3163 /* apply any parent delta for change in unconsumed refreservation */
3164 dsl_dir_diduse_space(csa
->ohds
->ds_dir
, DD_USED_REFRSRV
,
3165 csa
->unused_refres_delta
, 0, 0, tx
);
3170 dsl_deadlist_close(&csa
->cds
->ds_deadlist
);
3171 dsl_deadlist_close(&csa
->ohds
->ds_deadlist
);
3172 SWITCH64(csa
->ohds
->ds_phys
->ds_deadlist_obj
,
3173 csa
->cds
->ds_phys
->ds_deadlist_obj
);
3174 dsl_deadlist_open(&csa
->cds
->ds_deadlist
, dp
->dp_meta_objset
,
3175 csa
->cds
->ds_phys
->ds_deadlist_obj
);
3176 dsl_deadlist_open(&csa
->ohds
->ds_deadlist
, dp
->dp_meta_objset
,
3177 csa
->ohds
->ds_phys
->ds_deadlist_obj
);
3179 dsl_scan_ds_clone_swapped(csa
->ohds
, csa
->cds
, tx
);
3183 * Swap 'clone' with its origin head datasets. Used at the end of "zfs
3184 * recv" into an existing fs to swizzle the file system to the new
3185 * version, and by "zfs rollback". Can also be used to swap two
3186 * independent head datasets if neither has any snapshots.
3189 dsl_dataset_clone_swap(dsl_dataset_t
*clone
, dsl_dataset_t
*origin_head
,
3192 struct cloneswaparg csa
;
3195 ASSERT(clone
->ds_owner
);
3196 ASSERT(origin_head
->ds_owner
);
3199 * Need exclusive access for the swap. If we're swapping these
3200 * datasets back after an error, we already hold the locks.
3202 if (!RW_WRITE_HELD(&clone
->ds_rwlock
))
3203 rw_enter(&clone
->ds_rwlock
, RW_WRITER
);
3204 if (!RW_WRITE_HELD(&origin_head
->ds_rwlock
) &&
3205 !rw_tryenter(&origin_head
->ds_rwlock
, RW_WRITER
)) {
3206 rw_exit(&clone
->ds_rwlock
);
3207 rw_enter(&origin_head
->ds_rwlock
, RW_WRITER
);
3208 if (!rw_tryenter(&clone
->ds_rwlock
, RW_WRITER
)) {
3209 rw_exit(&origin_head
->ds_rwlock
);
3214 csa
.ohds
= origin_head
;
3216 error
= dsl_sync_task_do(clone
->ds_dir
->dd_pool
,
3217 dsl_dataset_clone_swap_check
,
3218 dsl_dataset_clone_swap_sync
, &csa
, NULL
, 9);
3223 * Given a pool name and a dataset object number in that pool,
3224 * return the name of that dataset.
3227 dsl_dsobj_to_dsname(char *pname
, uint64_t obj
, char *buf
)
3234 if ((error
= spa_open(pname
, &spa
, FTAG
)) != 0)
3236 dp
= spa_get_dsl(spa
);
3237 rw_enter(&dp
->dp_config_rwlock
, RW_READER
);
3238 if ((error
= dsl_dataset_hold_obj(dp
, obj
, FTAG
, &ds
)) == 0) {
3239 dsl_dataset_name(ds
, buf
);
3240 dsl_dataset_rele(ds
, FTAG
);
3242 rw_exit(&dp
->dp_config_rwlock
);
3243 spa_close(spa
, FTAG
);
3249 dsl_dataset_check_quota(dsl_dataset_t
*ds
, boolean_t check_quota
,
3250 uint64_t asize
, uint64_t inflight
, uint64_t *used
, uint64_t *ref_rsrv
)
3254 ASSERT3S(asize
, >, 0);
3257 * *ref_rsrv is the portion of asize that will come from any
3258 * unconsumed refreservation space.
3262 mutex_enter(&ds
->ds_lock
);
3264 * Make a space adjustment for reserved bytes.
3266 if (ds
->ds_reserved
> ds
->ds_phys
->ds_unique_bytes
) {
3268 ds
->ds_reserved
- ds
->ds_phys
->ds_unique_bytes
);
3269 *used
-= (ds
->ds_reserved
- ds
->ds_phys
->ds_unique_bytes
);
3271 asize
- MIN(asize
, parent_delta(ds
, asize
+ inflight
));
3274 if (!check_quota
|| ds
->ds_quota
== 0) {
3275 mutex_exit(&ds
->ds_lock
);
3279 * If they are requesting more space, and our current estimate
3280 * is over quota, they get to try again unless the actual
3281 * on-disk is over quota and there are no pending changes (which
3282 * may free up space for us).
3284 if (ds
->ds_phys
->ds_used_bytes
+ inflight
>= ds
->ds_quota
) {
3285 if (inflight
> 0 || ds
->ds_phys
->ds_used_bytes
< ds
->ds_quota
)
3290 mutex_exit(&ds
->ds_lock
);
3297 dsl_dataset_set_quota_check(void *arg1
, void *arg2
, dmu_tx_t
*tx
)
3299 dsl_dataset_t
*ds
= arg1
;
3300 dsl_prop_setarg_t
*psa
= arg2
;
3303 if (spa_version(ds
->ds_dir
->dd_pool
->dp_spa
) < SPA_VERSION_REFQUOTA
)
3306 if ((err
= dsl_prop_predict_sync(ds
->ds_dir
, psa
)) != 0)
3309 if (psa
->psa_effective_value
== 0)
3312 if (psa
->psa_effective_value
< ds
->ds_phys
->ds_used_bytes
||
3313 psa
->psa_effective_value
< ds
->ds_reserved
)
3319 extern void dsl_prop_set_sync(void *, void *, dmu_tx_t
*);
3322 dsl_dataset_set_quota_sync(void *arg1
, void *arg2
, dmu_tx_t
*tx
)
3324 dsl_dataset_t
*ds
= arg1
;
3325 dsl_prop_setarg_t
*psa
= arg2
;
3326 uint64_t effective_value
= psa
->psa_effective_value
;
3328 dsl_prop_set_sync(ds
, psa
, tx
);
3329 DSL_PROP_CHECK_PREDICTION(ds
->ds_dir
, psa
);
3331 if (ds
->ds_quota
!= effective_value
) {
3332 dmu_buf_will_dirty(ds
->ds_dbuf
, tx
);
3333 ds
->ds_quota
= effective_value
;
3335 spa_history_log_internal(LOG_DS_REFQUOTA
,
3336 ds
->ds_dir
->dd_pool
->dp_spa
, tx
, "%lld dataset = %llu ",
3337 (longlong_t
)ds
->ds_quota
, ds
->ds_object
);
3342 dsl_dataset_set_quota(const char *dsname
, zprop_source_t source
, uint64_t quota
)
3345 dsl_prop_setarg_t psa
;
3348 dsl_prop_setarg_init_uint64(&psa
, "refquota", source
, "a
);
3350 err
= dsl_dataset_hold(dsname
, FTAG
, &ds
);
3355 * If someone removes a file, then tries to set the quota, we
3356 * want to make sure the file freeing takes effect.
3358 txg_wait_open(ds
->ds_dir
->dd_pool
, 0);
3360 err
= dsl_sync_task_do(ds
->ds_dir
->dd_pool
,
3361 dsl_dataset_set_quota_check
, dsl_dataset_set_quota_sync
,
3364 dsl_dataset_rele(ds
, FTAG
);
3369 dsl_dataset_set_reservation_check(void *arg1
, void *arg2
, dmu_tx_t
*tx
)
3371 dsl_dataset_t
*ds
= arg1
;
3372 dsl_prop_setarg_t
*psa
= arg2
;
3373 uint64_t effective_value
;
3377 if (spa_version(ds
->ds_dir
->dd_pool
->dp_spa
) <
3378 SPA_VERSION_REFRESERVATION
)
3381 if (dsl_dataset_is_snapshot(ds
))
3384 if ((err
= dsl_prop_predict_sync(ds
->ds_dir
, psa
)) != 0)
3387 effective_value
= psa
->psa_effective_value
;
3390 * If we are doing the preliminary check in open context, the
3391 * space estimates may be inaccurate.
3393 if (!dmu_tx_is_syncing(tx
))
3396 mutex_enter(&ds
->ds_lock
);
3397 if (!DS_UNIQUE_IS_ACCURATE(ds
))
3398 dsl_dataset_recalc_head_uniq(ds
);
3399 unique
= ds
->ds_phys
->ds_unique_bytes
;
3400 mutex_exit(&ds
->ds_lock
);
3402 if (MAX(unique
, effective_value
) > MAX(unique
, ds
->ds_reserved
)) {
3403 uint64_t delta
= MAX(unique
, effective_value
) -
3404 MAX(unique
, ds
->ds_reserved
);
3406 if (delta
> dsl_dir_space_available(ds
->ds_dir
, NULL
, 0, TRUE
))
3408 if (ds
->ds_quota
> 0 &&
3409 effective_value
> ds
->ds_quota
)
3417 dsl_dataset_set_reservation_sync(void *arg1
, void *arg2
, dmu_tx_t
*tx
)
3419 dsl_dataset_t
*ds
= arg1
;
3420 dsl_prop_setarg_t
*psa
= arg2
;
3421 uint64_t effective_value
= psa
->psa_effective_value
;
3425 dsl_prop_set_sync(ds
, psa
, tx
);
3426 DSL_PROP_CHECK_PREDICTION(ds
->ds_dir
, psa
);
3428 dmu_buf_will_dirty(ds
->ds_dbuf
, tx
);
3430 mutex_enter(&ds
->ds_dir
->dd_lock
);
3431 mutex_enter(&ds
->ds_lock
);
3432 ASSERT(DS_UNIQUE_IS_ACCURATE(ds
));
3433 unique
= ds
->ds_phys
->ds_unique_bytes
;
3434 delta
= MAX(0, (int64_t)(effective_value
- unique
)) -
3435 MAX(0, (int64_t)(ds
->ds_reserved
- unique
));
3436 ds
->ds_reserved
= effective_value
;
3437 mutex_exit(&ds
->ds_lock
);
3439 dsl_dir_diduse_space(ds
->ds_dir
, DD_USED_REFRSRV
, delta
, 0, 0, tx
);
3440 mutex_exit(&ds
->ds_dir
->dd_lock
);
3442 spa_history_log_internal(LOG_DS_REFRESERV
,
3443 ds
->ds_dir
->dd_pool
->dp_spa
, tx
, "%lld dataset = %llu",
3444 (longlong_t
)effective_value
, ds
->ds_object
);
3448 dsl_dataset_set_reservation(const char *dsname
, zprop_source_t source
,
3449 uint64_t reservation
)
3452 dsl_prop_setarg_t psa
;
3455 dsl_prop_setarg_init_uint64(&psa
, "refreservation", source
,
3458 err
= dsl_dataset_hold(dsname
, FTAG
, &ds
);
3462 err
= dsl_sync_task_do(ds
->ds_dir
->dd_pool
,
3463 dsl_dataset_set_reservation_check
,
3464 dsl_dataset_set_reservation_sync
, ds
, &psa
, 0);
3466 dsl_dataset_rele(ds
, FTAG
);
3470 typedef struct zfs_hold_cleanup_arg
{
3473 char htag
[MAXNAMELEN
];
3474 } zfs_hold_cleanup_arg_t
;
3477 dsl_dataset_user_release_onexit(void *arg
)
3479 zfs_hold_cleanup_arg_t
*ca
= arg
;
3481 (void) dsl_dataset_user_release_tmp(ca
->dp
, ca
->dsobj
, ca
->htag
,
3483 kmem_free(ca
, sizeof (zfs_hold_cleanup_arg_t
));
3487 dsl_register_onexit_hold_cleanup(dsl_dataset_t
*ds
, const char *htag
,
3490 zfs_hold_cleanup_arg_t
*ca
;
3492 ca
= kmem_alloc(sizeof (zfs_hold_cleanup_arg_t
), KM_SLEEP
);
3493 ca
->dp
= ds
->ds_dir
->dd_pool
;
3494 ca
->dsobj
= ds
->ds_object
;
3495 (void) strlcpy(ca
->htag
, htag
, sizeof (ca
->htag
));
3496 VERIFY3U(0, ==, zfs_onexit_add_cb(minor
,
3497 dsl_dataset_user_release_onexit
, ca
, NULL
));
3501 * If you add new checks here, you may need to add
3502 * additional checks to the "temporary" case in
3503 * snapshot_check() in dmu_objset.c.
3506 dsl_dataset_user_hold_check(void *arg1
, void *arg2
, dmu_tx_t
*tx
)
3508 dsl_dataset_t
*ds
= arg1
;
3509 struct dsl_ds_holdarg
*ha
= arg2
;
3510 char *htag
= ha
->htag
;
3511 objset_t
*mos
= ds
->ds_dir
->dd_pool
->dp_meta_objset
;
3514 if (spa_version(ds
->ds_dir
->dd_pool
->dp_spa
) < SPA_VERSION_USERREFS
)
3517 if (!dsl_dataset_is_snapshot(ds
))
3520 /* tags must be unique */
3521 mutex_enter(&ds
->ds_lock
);
3522 if (ds
->ds_phys
->ds_userrefs_obj
) {
3523 error
= zap_lookup(mos
, ds
->ds_phys
->ds_userrefs_obj
, htag
,
3527 else if (error
== ENOENT
)
3530 mutex_exit(&ds
->ds_lock
);
3532 if (error
== 0 && ha
->temphold
&&
3533 strlen(htag
) + MAX_TAG_PREFIX_LEN
>= MAXNAMELEN
)
3540 dsl_dataset_user_hold_sync(void *arg1
, void *arg2
, dmu_tx_t
*tx
)
3542 dsl_dataset_t
*ds
= arg1
;
3543 struct dsl_ds_holdarg
*ha
= arg2
;
3544 char *htag
= ha
->htag
;
3545 dsl_pool_t
*dp
= ds
->ds_dir
->dd_pool
;
3546 objset_t
*mos
= dp
->dp_meta_objset
;
3547 uint64_t now
= gethrestime_sec();
3550 mutex_enter(&ds
->ds_lock
);
3551 if (ds
->ds_phys
->ds_userrefs_obj
== 0) {
3553 * This is the first user hold for this dataset. Create
3554 * the userrefs zap object.
3556 dmu_buf_will_dirty(ds
->ds_dbuf
, tx
);
3557 zapobj
= ds
->ds_phys
->ds_userrefs_obj
=
3558 zap_create(mos
, DMU_OT_USERREFS
, DMU_OT_NONE
, 0, tx
);
3560 zapobj
= ds
->ds_phys
->ds_userrefs_obj
;
3563 mutex_exit(&ds
->ds_lock
);
3565 VERIFY(0 == zap_add(mos
, zapobj
, htag
, 8, 1, &now
, tx
));
3568 VERIFY(0 == dsl_pool_user_hold(dp
, ds
->ds_object
,
3572 spa_history_log_internal(LOG_DS_USER_HOLD
,
3573 dp
->dp_spa
, tx
, "<%s> temp = %d dataset = %llu", htag
,
3574 (int)ha
->temphold
, ds
->ds_object
);
3578 dsl_dataset_user_hold_one(const char *dsname
, void *arg
)
3580 struct dsl_ds_holdarg
*ha
= arg
;
3585 /* alloc a buffer to hold dsname@snapname plus terminating NULL */
3586 name
= kmem_asprintf("%s@%s", dsname
, ha
->snapname
);
3587 error
= dsl_dataset_hold(name
, ha
->dstg
, &ds
);
3590 ha
->gotone
= B_TRUE
;
3591 dsl_sync_task_create(ha
->dstg
, dsl_dataset_user_hold_check
,
3592 dsl_dataset_user_hold_sync
, ds
, ha
, 0);
3593 } else if (error
== ENOENT
&& ha
->recursive
) {
3596 (void) strlcpy(ha
->failed
, dsname
, sizeof (ha
->failed
));
3602 dsl_dataset_user_hold_for_send(dsl_dataset_t
*ds
, char *htag
,
3605 struct dsl_ds_holdarg
*ha
;
3608 ha
= kmem_zalloc(sizeof (struct dsl_ds_holdarg
), KM_SLEEP
);
3610 ha
->temphold
= temphold
;
3611 error
= dsl_sync_task_do(ds
->ds_dir
->dd_pool
,
3612 dsl_dataset_user_hold_check
, dsl_dataset_user_hold_sync
,
3614 kmem_free(ha
, sizeof (struct dsl_ds_holdarg
));
3620 dsl_dataset_user_hold(char *dsname
, char *snapname
, char *htag
,
3621 boolean_t recursive
, boolean_t temphold
, int cleanup_fd
)
3623 struct dsl_ds_holdarg
*ha
;
3624 dsl_sync_task_t
*dst
;
3629 if (cleanup_fd
!= -1) {
3630 /* Currently we only support cleanup-on-exit of tempholds. */
3633 error
= zfs_onexit_fd_hold(cleanup_fd
, &minor
);
3638 ha
= kmem_zalloc(sizeof (struct dsl_ds_holdarg
), KM_SLEEP
);
3640 (void) strlcpy(ha
->failed
, dsname
, sizeof (ha
->failed
));
3642 error
= spa_open(dsname
, &spa
, FTAG
);
3644 kmem_free(ha
, sizeof (struct dsl_ds_holdarg
));
3645 if (cleanup_fd
!= -1)
3646 zfs_onexit_fd_rele(cleanup_fd
);
3650 ha
->dstg
= dsl_sync_task_group_create(spa_get_dsl(spa
));
3652 ha
->snapname
= snapname
;
3653 ha
->recursive
= recursive
;
3654 ha
->temphold
= temphold
;
3657 error
= dmu_objset_find(dsname
, dsl_dataset_user_hold_one
,
3658 ha
, DS_FIND_CHILDREN
);
3660 error
= dsl_dataset_user_hold_one(dsname
, ha
);
3663 error
= dsl_sync_task_group_wait(ha
->dstg
);
3665 for (dst
= list_head(&ha
->dstg
->dstg_tasks
); dst
;
3666 dst
= list_next(&ha
->dstg
->dstg_tasks
, dst
)) {
3667 dsl_dataset_t
*ds
= dst
->dst_arg1
;
3670 dsl_dataset_name(ds
, ha
->failed
);
3671 *strchr(ha
->failed
, '@') = '\0';
3672 } else if (error
== 0 && minor
!= 0 && temphold
) {
3674 * If this hold is to be released upon process exit,
3675 * register that action now.
3677 dsl_register_onexit_hold_cleanup(ds
, htag
, minor
);
3679 dsl_dataset_rele(ds
, ha
->dstg
);
3682 if (error
== 0 && recursive
&& !ha
->gotone
)
3686 (void) strlcpy(dsname
, ha
->failed
, sizeof (ha
->failed
));
3688 dsl_sync_task_group_destroy(ha
->dstg
);
3690 kmem_free(ha
, sizeof (struct dsl_ds_holdarg
));
3691 spa_close(spa
, FTAG
);
3692 if (cleanup_fd
!= -1)
3693 zfs_onexit_fd_rele(cleanup_fd
);
3697 struct dsl_ds_releasearg
{
3700 boolean_t own
; /* do we own or just hold ds? */
3704 dsl_dataset_release_might_destroy(dsl_dataset_t
*ds
, const char *htag
,
3705 boolean_t
*might_destroy
)
3707 objset_t
*mos
= ds
->ds_dir
->dd_pool
->dp_meta_objset
;
3712 *might_destroy
= B_FALSE
;
3714 mutex_enter(&ds
->ds_lock
);
3715 zapobj
= ds
->ds_phys
->ds_userrefs_obj
;
3717 /* The tag can't possibly exist */
3718 mutex_exit(&ds
->ds_lock
);
3722 /* Make sure the tag exists */
3723 error
= zap_lookup(mos
, zapobj
, htag
, 8, 1, &tmp
);
3725 mutex_exit(&ds
->ds_lock
);
3726 if (error
== ENOENT
)
3731 if (ds
->ds_userrefs
== 1 && ds
->ds_phys
->ds_num_children
== 1 &&
3732 DS_IS_DEFER_DESTROY(ds
))
3733 *might_destroy
= B_TRUE
;
3735 mutex_exit(&ds
->ds_lock
);
3740 dsl_dataset_user_release_check(void *arg1
, void *tag
, dmu_tx_t
*tx
)
3742 struct dsl_ds_releasearg
*ra
= arg1
;
3743 dsl_dataset_t
*ds
= ra
->ds
;
3744 boolean_t might_destroy
;
3747 if (spa_version(ds
->ds_dir
->dd_pool
->dp_spa
) < SPA_VERSION_USERREFS
)
3750 error
= dsl_dataset_release_might_destroy(ds
, ra
->htag
, &might_destroy
);
3754 if (might_destroy
) {
3755 struct dsl_ds_destroyarg dsda
= {0};
3757 if (dmu_tx_is_syncing(tx
)) {
3759 * If we're not prepared to remove the snapshot,
3760 * we can't allow the release to happen right now.
3766 dsda
.releasing
= B_TRUE
;
3767 return (dsl_dataset_destroy_check(&dsda
, tag
, tx
));
3774 dsl_dataset_user_release_sync(void *arg1
, void *tag
, dmu_tx_t
*tx
)
3776 struct dsl_ds_releasearg
*ra
= arg1
;
3777 dsl_dataset_t
*ds
= ra
->ds
;
3778 dsl_pool_t
*dp
= ds
->ds_dir
->dd_pool
;
3779 objset_t
*mos
= dp
->dp_meta_objset
;
3781 uint64_t dsobj
= ds
->ds_object
;
3785 mutex_enter(&ds
->ds_lock
);
3787 refs
= ds
->ds_userrefs
;
3788 mutex_exit(&ds
->ds_lock
);
3789 error
= dsl_pool_user_release(dp
, ds
->ds_object
, ra
->htag
, tx
);
3790 VERIFY(error
== 0 || error
== ENOENT
);
3791 zapobj
= ds
->ds_phys
->ds_userrefs_obj
;
3792 VERIFY(0 == zap_remove(mos
, zapobj
, ra
->htag
, tx
));
3793 if (ds
->ds_userrefs
== 0 && ds
->ds_phys
->ds_num_children
== 1 &&
3794 DS_IS_DEFER_DESTROY(ds
)) {
3795 struct dsl_ds_destroyarg dsda
= {0};
3799 dsda
.releasing
= B_TRUE
;
3800 /* We already did the destroy_check */
3801 dsl_dataset_destroy_sync(&dsda
, tag
, tx
);
3804 spa_history_log_internal(LOG_DS_USER_RELEASE
,
3805 dp
->dp_spa
, tx
, "<%s> %lld dataset = %llu",
3806 ra
->htag
, (longlong_t
)refs
, dsobj
);
3810 dsl_dataset_user_release_one(const char *dsname
, void *arg
)
3812 struct dsl_ds_holdarg
*ha
= arg
;
3813 struct dsl_ds_releasearg
*ra
;
3816 void *dtag
= ha
->dstg
;
3818 boolean_t own
= B_FALSE
;
3819 boolean_t might_destroy
;
3821 /* alloc a buffer to hold dsname@snapname, plus the terminating NULL */
3822 name
= kmem_asprintf("%s@%s", dsname
, ha
->snapname
);
3823 error
= dsl_dataset_hold(name
, dtag
, &ds
);
3825 if (error
== ENOENT
&& ha
->recursive
)
3827 (void) strlcpy(ha
->failed
, dsname
, sizeof (ha
->failed
));
3831 ha
->gotone
= B_TRUE
;
3833 ASSERT(dsl_dataset_is_snapshot(ds
));
3835 error
= dsl_dataset_release_might_destroy(ds
, ha
->htag
, &might_destroy
);
3837 dsl_dataset_rele(ds
, dtag
);
3841 if (might_destroy
) {
3843 name
= kmem_asprintf("%s@%s", dsname
, ha
->snapname
);
3844 error
= zfs_unmount_snap(name
, NULL
);
3847 dsl_dataset_rele(ds
, dtag
);
3851 if (!dsl_dataset_tryown(ds
, B_TRUE
, dtag
)) {
3852 dsl_dataset_rele(ds
, dtag
);
3856 dsl_dataset_make_exclusive(ds
, dtag
);
3860 ra
= kmem_alloc(sizeof (struct dsl_ds_releasearg
), KM_SLEEP
);
3862 ra
->htag
= ha
->htag
;
3864 dsl_sync_task_create(ha
->dstg
, dsl_dataset_user_release_check
,
3865 dsl_dataset_user_release_sync
, ra
, dtag
, 0);
3871 dsl_dataset_user_release(char *dsname
, char *snapname
, char *htag
,
3872 boolean_t recursive
)
3874 struct dsl_ds_holdarg
*ha
;
3875 dsl_sync_task_t
*dst
;
3880 ha
= kmem_zalloc(sizeof (struct dsl_ds_holdarg
), KM_SLEEP
);
3882 (void) strlcpy(ha
->failed
, dsname
, sizeof (ha
->failed
));
3884 error
= spa_open(dsname
, &spa
, FTAG
);
3886 kmem_free(ha
, sizeof (struct dsl_ds_holdarg
));
3890 ha
->dstg
= dsl_sync_task_group_create(spa_get_dsl(spa
));
3892 ha
->snapname
= snapname
;
3893 ha
->recursive
= recursive
;
3895 error
= dmu_objset_find(dsname
, dsl_dataset_user_release_one
,
3896 ha
, DS_FIND_CHILDREN
);
3898 error
= dsl_dataset_user_release_one(dsname
, ha
);
3901 error
= dsl_sync_task_group_wait(ha
->dstg
);
3903 for (dst
= list_head(&ha
->dstg
->dstg_tasks
); dst
;
3904 dst
= list_next(&ha
->dstg
->dstg_tasks
, dst
)) {
3905 struct dsl_ds_releasearg
*ra
= dst
->dst_arg1
;
3906 dsl_dataset_t
*ds
= ra
->ds
;
3909 dsl_dataset_name(ds
, ha
->failed
);
3912 dsl_dataset_disown(ds
, ha
->dstg
);
3914 dsl_dataset_rele(ds
, ha
->dstg
);
3916 kmem_free(ra
, sizeof (struct dsl_ds_releasearg
));
3919 if (error
== 0 && recursive
&& !ha
->gotone
)
3922 if (error
&& error
!= EBUSY
)
3923 (void) strlcpy(dsname
, ha
->failed
, sizeof (ha
->failed
));
3925 dsl_sync_task_group_destroy(ha
->dstg
);
3926 kmem_free(ha
, sizeof (struct dsl_ds_holdarg
));
3927 spa_close(spa
, FTAG
);
3930 * We can get EBUSY if we were racing with deferred destroy and
3931 * dsl_dataset_user_release_check() hadn't done the necessary
3932 * open context setup. We can also get EBUSY if we're racing
3933 * with destroy and that thread is the ds_owner. Either way
3934 * the busy condition should be transient, and we should retry
3935 * the release operation.
3944 * Called at spa_load time (with retry == B_FALSE) to release a stale
3945 * temporary user hold. Also called by the onexit code (with retry == B_TRUE).
3948 dsl_dataset_user_release_tmp(dsl_pool_t
*dp
, uint64_t dsobj
, char *htag
,
3958 rw_enter(&dp
->dp_config_rwlock
, RW_READER
);
3959 error
= dsl_dataset_hold_obj(dp
, dsobj
, FTAG
, &ds
);
3960 rw_exit(&dp
->dp_config_rwlock
);
3963 namelen
= dsl_dataset_namelen(ds
)+1;
3964 name
= kmem_alloc(namelen
, KM_SLEEP
);
3965 dsl_dataset_name(ds
, name
);
3966 dsl_dataset_rele(ds
, FTAG
);
3968 snap
= strchr(name
, '@');
3971 error
= dsl_dataset_user_release(name
, snap
, htag
, B_FALSE
);
3972 kmem_free(name
, namelen
);
3975 * The object can't have been destroyed because we have a hold,
3976 * but it might have been renamed, resulting in ENOENT. Retry
3977 * if we've been requested to do so.
3979 * It would be nice if we could use the dsobj all the way
3980 * through and avoid ENOENT entirely. But we might need to
3981 * unmount the snapshot, and there's currently no way to lookup
3982 * a vfsp using a ZFS object id.
3984 } while ((error
== ENOENT
) && retry
);
3990 dsl_dataset_get_holds(const char *dsname
, nvlist_t
**nvp
)
3995 err
= dsl_dataset_hold(dsname
, FTAG
, &ds
);
3999 VERIFY(0 == nvlist_alloc(nvp
, NV_UNIQUE_NAME
, KM_SLEEP
));
4000 if (ds
->ds_phys
->ds_userrefs_obj
!= 0) {
4001 zap_attribute_t
*za
;
4004 za
= kmem_alloc(sizeof (zap_attribute_t
), KM_SLEEP
);
4005 for (zap_cursor_init(&zc
, ds
->ds_dir
->dd_pool
->dp_meta_objset
,
4006 ds
->ds_phys
->ds_userrefs_obj
);
4007 zap_cursor_retrieve(&zc
, za
) == 0;
4008 zap_cursor_advance(&zc
)) {
4009 VERIFY(0 == nvlist_add_uint64(*nvp
, za
->za_name
,
4010 za
->za_first_integer
));
4012 zap_cursor_fini(&zc
);
4013 kmem_free(za
, sizeof (zap_attribute_t
));
4015 dsl_dataset_rele(ds
, FTAG
);
4020 * Note, this fuction is used as the callback for dmu_objset_find(). We
4021 * always return 0 so that we will continue to find and process
4022 * inconsistent datasets, even if we encounter an error trying to
4023 * process one of them.
4027 dsl_destroy_inconsistent(const char *dsname
, void *arg
)
4031 if (dsl_dataset_own(dsname
, B_TRUE
, FTAG
, &ds
) == 0) {
4032 if (DS_IS_INCONSISTENT(ds
))
4033 (void) dsl_dataset_destroy(ds
, FTAG
, B_FALSE
);
4035 dsl_dataset_disown(ds
, FTAG
);