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
;
392 ds
= kmem_zalloc(sizeof (dsl_dataset_t
), KM_SLEEP
);
394 ds
->ds_object
= dsobj
;
395 ds
->ds_phys
= dbuf
->db_data
;
397 mutex_init(&ds
->ds_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
398 mutex_init(&ds
->ds_recvlock
, NULL
, MUTEX_DEFAULT
, NULL
);
399 mutex_init(&ds
->ds_opening_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
400 rw_init(&ds
->ds_rwlock
, 0, 0, 0);
401 cv_init(&ds
->ds_exclusive_cv
, NULL
, CV_DEFAULT
, NULL
);
403 bplist_create(&ds
->ds_pending_deadlist
);
404 dsl_deadlist_open(&ds
->ds_deadlist
,
405 mos
, ds
->ds_phys
->ds_deadlist_obj
);
408 err
= dsl_dir_open_obj(dp
,
409 ds
->ds_phys
->ds_dir_obj
, NULL
, ds
, &ds
->ds_dir
);
412 mutex_destroy(&ds
->ds_lock
);
413 mutex_destroy(&ds
->ds_recvlock
);
414 mutex_destroy(&ds
->ds_opening_lock
);
415 rw_destroy(&ds
->ds_rwlock
);
416 cv_destroy(&ds
->ds_exclusive_cv
);
417 bplist_destroy(&ds
->ds_pending_deadlist
);
418 dsl_deadlist_close(&ds
->ds_deadlist
);
419 kmem_free(ds
, sizeof (dsl_dataset_t
));
420 dmu_buf_rele(dbuf
, tag
);
424 if (!dsl_dataset_is_snapshot(ds
)) {
425 ds
->ds_snapname
[0] = '\0';
426 if (ds
->ds_phys
->ds_prev_snap_obj
) {
427 err
= dsl_dataset_get_ref(dp
,
428 ds
->ds_phys
->ds_prev_snap_obj
,
432 if (zfs_flags
& ZFS_DEBUG_SNAPNAMES
)
433 err
= dsl_dataset_get_snapname(ds
);
434 if (err
== 0 && ds
->ds_phys
->ds_userrefs_obj
!= 0) {
436 ds
->ds_dir
->dd_pool
->dp_meta_objset
,
437 ds
->ds_phys
->ds_userrefs_obj
,
442 if (err
== 0 && !dsl_dataset_is_snapshot(ds
)) {
444 * In sync context, we're called with either no lock
445 * or with the write lock. If we're not syncing,
446 * we're always called with the read lock held.
448 boolean_t need_lock
=
449 !RW_WRITE_HELD(&dp
->dp_config_rwlock
) &&
450 dsl_pool_sync_context(dp
);
453 rw_enter(&dp
->dp_config_rwlock
, RW_READER
);
455 err
= dsl_prop_get_ds(ds
,
456 "refreservation", sizeof (uint64_t), 1,
457 &ds
->ds_reserved
, NULL
);
459 err
= dsl_prop_get_ds(ds
,
460 "refquota", sizeof (uint64_t), 1,
461 &ds
->ds_quota
, NULL
);
465 rw_exit(&dp
->dp_config_rwlock
);
467 ds
->ds_reserved
= ds
->ds_quota
= 0;
471 winner
= dmu_buf_set_user_ie(dbuf
, ds
, &ds
->ds_phys
,
475 bplist_destroy(&ds
->ds_pending_deadlist
);
476 dsl_deadlist_close(&ds
->ds_deadlist
);
478 dsl_dataset_drop_ref(ds
->ds_prev
, ds
);
479 dsl_dir_close(ds
->ds_dir
, ds
);
480 mutex_destroy(&ds
->ds_lock
);
481 mutex_destroy(&ds
->ds_recvlock
);
482 mutex_destroy(&ds
->ds_opening_lock
);
483 rw_destroy(&ds
->ds_rwlock
);
484 cv_destroy(&ds
->ds_exclusive_cv
);
485 kmem_free(ds
, sizeof (dsl_dataset_t
));
487 dmu_buf_rele(dbuf
, tag
);
493 unique_insert(ds
->ds_phys
->ds_fsid_guid
);
496 ASSERT3P(ds
->ds_dbuf
, ==, dbuf
);
497 ASSERT3P(ds
->ds_phys
, ==, dbuf
->db_data
);
498 ASSERT(ds
->ds_phys
->ds_prev_snap_obj
!= 0 ||
499 spa_version(dp
->dp_spa
) < SPA_VERSION_ORIGIN
||
500 dp
->dp_origin_snap
== NULL
|| ds
== dp
->dp_origin_snap
);
501 mutex_enter(&ds
->ds_lock
);
502 if (!dsl_pool_sync_context(dp
) && DSL_DATASET_IS_DESTROYED(ds
)) {
503 mutex_exit(&ds
->ds_lock
);
504 dmu_buf_rele(ds
->ds_dbuf
, tag
);
507 mutex_exit(&ds
->ds_lock
);
513 dsl_dataset_hold_ref(dsl_dataset_t
*ds
, void *tag
)
515 dsl_pool_t
*dp
= ds
->ds_dir
->dd_pool
;
518 * In syncing context we don't want the rwlock lock: there
519 * may be an existing writer waiting for sync phase to
520 * finish. We don't need to worry about such writers, since
521 * sync phase is single-threaded, so the writer can't be
522 * doing anything while we are active.
524 if (dsl_pool_sync_context(dp
)) {
525 ASSERT(!DSL_DATASET_IS_DESTROYED(ds
));
530 * Normal users will hold the ds_rwlock as a READER until they
531 * are finished (i.e., call dsl_dataset_rele()). "Owners" will
532 * drop their READER lock after they set the ds_owner field.
534 * If the dataset is being destroyed, the destroy thread will
535 * obtain a WRITER lock for exclusive access after it's done its
536 * open-context work and then change the ds_owner to
537 * dsl_reaper once destruction is assured. So threads
538 * may block here temporarily, until the "destructability" of
539 * the dataset is determined.
541 ASSERT(!RW_WRITE_HELD(&dp
->dp_config_rwlock
));
542 mutex_enter(&ds
->ds_lock
);
543 while (!rw_tryenter(&ds
->ds_rwlock
, RW_READER
)) {
544 rw_exit(&dp
->dp_config_rwlock
);
545 cv_wait(&ds
->ds_exclusive_cv
, &ds
->ds_lock
);
546 if (DSL_DATASET_IS_DESTROYED(ds
)) {
547 mutex_exit(&ds
->ds_lock
);
548 dsl_dataset_drop_ref(ds
, tag
);
549 rw_enter(&dp
->dp_config_rwlock
, RW_READER
);
553 * The dp_config_rwlock lives above the ds_lock. And
554 * we need to check DSL_DATASET_IS_DESTROYED() while
555 * holding the ds_lock, so we have to drop and reacquire
558 mutex_exit(&ds
->ds_lock
);
559 rw_enter(&dp
->dp_config_rwlock
, RW_READER
);
560 mutex_enter(&ds
->ds_lock
);
562 mutex_exit(&ds
->ds_lock
);
567 dsl_dataset_hold_obj(dsl_pool_t
*dp
, uint64_t dsobj
, void *tag
,
570 int err
= dsl_dataset_get_ref(dp
, dsobj
, tag
, dsp
);
574 return (dsl_dataset_hold_ref(*dsp
, tag
));
578 dsl_dataset_own_obj(dsl_pool_t
*dp
, uint64_t dsobj
, boolean_t inconsistentok
,
579 void *tag
, dsl_dataset_t
**dsp
)
581 int err
= dsl_dataset_hold_obj(dp
, dsobj
, tag
, dsp
);
584 if (!dsl_dataset_tryown(*dsp
, inconsistentok
, tag
)) {
585 dsl_dataset_rele(*dsp
, tag
);
593 dsl_dataset_hold(const char *name
, void *tag
, dsl_dataset_t
**dsp
)
597 const char *snapname
;
601 err
= dsl_dir_open_spa(NULL
, name
, FTAG
, &dd
, &snapname
);
606 obj
= dd
->dd_phys
->dd_head_dataset_obj
;
607 rw_enter(&dp
->dp_config_rwlock
, RW_READER
);
609 err
= dsl_dataset_get_ref(dp
, obj
, tag
, dsp
);
615 err
= dsl_dataset_hold_ref(*dsp
, tag
);
617 /* we may be looking for a snapshot */
618 if (err
== 0 && snapname
!= NULL
) {
619 dsl_dataset_t
*ds
= NULL
;
621 if (*snapname
++ != '@') {
622 dsl_dataset_rele(*dsp
, tag
);
627 dprintf("looking for snapshot '%s'\n", snapname
);
628 err
= dsl_dataset_snap_lookup(*dsp
, snapname
, &obj
);
630 err
= dsl_dataset_get_ref(dp
, obj
, tag
, &ds
);
631 dsl_dataset_rele(*dsp
, tag
);
633 ASSERT3U((err
== 0), ==, (ds
!= NULL
));
636 mutex_enter(&ds
->ds_lock
);
637 if (ds
->ds_snapname
[0] == 0)
638 (void) strlcpy(ds
->ds_snapname
, snapname
,
639 sizeof (ds
->ds_snapname
));
640 mutex_exit(&ds
->ds_lock
);
641 err
= dsl_dataset_hold_ref(ds
, tag
);
642 *dsp
= err
? NULL
: ds
;
646 rw_exit(&dp
->dp_config_rwlock
);
647 dsl_dir_close(dd
, FTAG
);
652 dsl_dataset_own(const char *name
, boolean_t inconsistentok
,
653 void *tag
, dsl_dataset_t
**dsp
)
655 int err
= dsl_dataset_hold(name
, tag
, dsp
);
658 if (!dsl_dataset_tryown(*dsp
, inconsistentok
, tag
)) {
659 dsl_dataset_rele(*dsp
, tag
);
666 dsl_dataset_name(dsl_dataset_t
*ds
, char *name
)
669 (void) strcpy(name
, "mos");
671 dsl_dir_name(ds
->ds_dir
, name
);
672 VERIFY(0 == dsl_dataset_get_snapname(ds
));
673 if (ds
->ds_snapname
[0]) {
674 (void) strcat(name
, "@");
676 * We use a "recursive" mutex so that we
677 * can call dprintf_ds() with ds_lock held.
679 if (!MUTEX_HELD(&ds
->ds_lock
)) {
680 mutex_enter(&ds
->ds_lock
);
681 (void) strcat(name
, ds
->ds_snapname
);
682 mutex_exit(&ds
->ds_lock
);
684 (void) strcat(name
, ds
->ds_snapname
);
691 dsl_dataset_namelen(dsl_dataset_t
*ds
)
696 result
= 3; /* "mos" */
698 result
= dsl_dir_namelen(ds
->ds_dir
);
699 VERIFY(0 == dsl_dataset_get_snapname(ds
));
700 if (ds
->ds_snapname
[0]) {
701 ++result
; /* adding one for the @-sign */
702 if (!MUTEX_HELD(&ds
->ds_lock
)) {
703 mutex_enter(&ds
->ds_lock
);
704 result
+= strlen(ds
->ds_snapname
);
705 mutex_exit(&ds
->ds_lock
);
707 result
+= strlen(ds
->ds_snapname
);
716 dsl_dataset_drop_ref(dsl_dataset_t
*ds
, void *tag
)
718 dmu_buf_rele(ds
->ds_dbuf
, tag
);
722 dsl_dataset_rele(dsl_dataset_t
*ds
, void *tag
)
724 if (!dsl_pool_sync_context(ds
->ds_dir
->dd_pool
)) {
725 rw_exit(&ds
->ds_rwlock
);
727 dsl_dataset_drop_ref(ds
, tag
);
731 dsl_dataset_disown(dsl_dataset_t
*ds
, void *tag
)
733 ASSERT((ds
->ds_owner
== tag
&& ds
->ds_dbuf
) ||
734 (DSL_DATASET_IS_DESTROYED(ds
) && ds
->ds_dbuf
== NULL
));
736 mutex_enter(&ds
->ds_lock
);
738 if (RW_WRITE_HELD(&ds
->ds_rwlock
)) {
739 rw_exit(&ds
->ds_rwlock
);
740 cv_broadcast(&ds
->ds_exclusive_cv
);
742 mutex_exit(&ds
->ds_lock
);
744 dsl_dataset_drop_ref(ds
, tag
);
746 dsl_dataset_evict(NULL
, ds
);
750 dsl_dataset_tryown(dsl_dataset_t
*ds
, boolean_t inconsistentok
, void *tag
)
752 boolean_t gotit
= FALSE
;
754 mutex_enter(&ds
->ds_lock
);
755 if (ds
->ds_owner
== NULL
&&
756 (!DS_IS_INCONSISTENT(ds
) || inconsistentok
)) {
758 if (!dsl_pool_sync_context(ds
->ds_dir
->dd_pool
))
759 rw_exit(&ds
->ds_rwlock
);
762 mutex_exit(&ds
->ds_lock
);
767 dsl_dataset_make_exclusive(dsl_dataset_t
*ds
, void *owner
)
769 ASSERT3P(owner
, ==, ds
->ds_owner
);
770 if (!RW_WRITE_HELD(&ds
->ds_rwlock
))
771 rw_enter(&ds
->ds_rwlock
, RW_WRITER
);
775 dsl_dataset_create_sync_dd(dsl_dir_t
*dd
, dsl_dataset_t
*origin
,
776 uint64_t flags
, dmu_tx_t
*tx
)
778 dsl_pool_t
*dp
= dd
->dd_pool
;
780 dsl_dataset_phys_t
*dsphys
;
782 objset_t
*mos
= dp
->dp_meta_objset
;
785 origin
= dp
->dp_origin_snap
;
787 ASSERT(origin
== NULL
|| origin
->ds_dir
->dd_pool
== dp
);
788 ASSERT(origin
== NULL
|| origin
->ds_phys
->ds_num_children
> 0);
789 ASSERT(dmu_tx_is_syncing(tx
));
790 ASSERT(dd
->dd_phys
->dd_head_dataset_obj
== 0);
792 dsobj
= dmu_object_alloc(mos
, DMU_OT_DSL_DATASET
, 0,
793 DMU_OT_DSL_DATASET
, sizeof (dsl_dataset_phys_t
), tx
);
794 VERIFY(0 == dmu_bonus_hold(mos
, dsobj
, FTAG
, &dbuf
));
795 dmu_buf_will_dirty(dbuf
, tx
);
796 dsphys
= dbuf
->db_data
;
797 bzero(dsphys
, sizeof (dsl_dataset_phys_t
));
798 dsphys
->ds_dir_obj
= dd
->dd_object
;
799 dsphys
->ds_flags
= flags
;
800 dsphys
->ds_fsid_guid
= unique_create();
801 (void) random_get_pseudo_bytes((void*)&dsphys
->ds_guid
,
802 sizeof (dsphys
->ds_guid
));
803 dsphys
->ds_snapnames_zapobj
=
804 zap_create_norm(mos
, U8_TEXTPREP_TOUPPER
, DMU_OT_DSL_DS_SNAP_MAP
,
806 dsphys
->ds_creation_time
= gethrestime_sec();
807 dsphys
->ds_creation_txg
= tx
->tx_txg
== TXG_INITIAL
? 1 : tx
->tx_txg
;
809 if (origin
== NULL
) {
810 dsphys
->ds_deadlist_obj
= dsl_deadlist_alloc(mos
, tx
);
814 dsphys
->ds_prev_snap_obj
= origin
->ds_object
;
815 dsphys
->ds_prev_snap_txg
=
816 origin
->ds_phys
->ds_creation_txg
;
817 dsphys
->ds_used_bytes
=
818 origin
->ds_phys
->ds_used_bytes
;
819 dsphys
->ds_compressed_bytes
=
820 origin
->ds_phys
->ds_compressed_bytes
;
821 dsphys
->ds_uncompressed_bytes
=
822 origin
->ds_phys
->ds_uncompressed_bytes
;
823 dsphys
->ds_bp
= origin
->ds_phys
->ds_bp
;
824 dsphys
->ds_flags
|= origin
->ds_phys
->ds_flags
;
826 dmu_buf_will_dirty(origin
->ds_dbuf
, tx
);
827 origin
->ds_phys
->ds_num_children
++;
829 VERIFY3U(0, ==, dsl_dataset_hold_obj(dp
,
830 origin
->ds_dir
->dd_phys
->dd_head_dataset_obj
, FTAG
, &ohds
));
831 dsphys
->ds_deadlist_obj
= dsl_deadlist_clone(&ohds
->ds_deadlist
,
832 dsphys
->ds_prev_snap_txg
, dsphys
->ds_prev_snap_obj
, tx
);
833 dsl_dataset_rele(ohds
, FTAG
);
835 if (spa_version(dp
->dp_spa
) >= SPA_VERSION_NEXT_CLONES
) {
836 if (origin
->ds_phys
->ds_next_clones_obj
== 0) {
837 origin
->ds_phys
->ds_next_clones_obj
=
839 DMU_OT_NEXT_CLONES
, DMU_OT_NONE
, 0, tx
);
841 VERIFY(0 == zap_add_int(mos
,
842 origin
->ds_phys
->ds_next_clones_obj
,
846 dmu_buf_will_dirty(dd
->dd_dbuf
, tx
);
847 dd
->dd_phys
->dd_origin_obj
= origin
->ds_object
;
848 if (spa_version(dp
->dp_spa
) >= SPA_VERSION_DIR_CLONES
) {
849 if (origin
->ds_dir
->dd_phys
->dd_clones
== 0) {
850 dmu_buf_will_dirty(origin
->ds_dir
->dd_dbuf
, tx
);
851 origin
->ds_dir
->dd_phys
->dd_clones
=
853 DMU_OT_DSL_CLONES
, DMU_OT_NONE
, 0, tx
);
855 VERIFY3U(0, ==, zap_add_int(mos
,
856 origin
->ds_dir
->dd_phys
->dd_clones
, dsobj
, tx
));
860 if (spa_version(dp
->dp_spa
) >= SPA_VERSION_UNIQUE_ACCURATE
)
861 dsphys
->ds_flags
|= DS_FLAG_UNIQUE_ACCURATE
;
863 dmu_buf_rele(dbuf
, FTAG
);
865 dmu_buf_will_dirty(dd
->dd_dbuf
, tx
);
866 dd
->dd_phys
->dd_head_dataset_obj
= dsobj
;
872 dsl_dataset_create_sync(dsl_dir_t
*pdd
, const char *lastname
,
873 dsl_dataset_t
*origin
, uint64_t flags
, cred_t
*cr
, dmu_tx_t
*tx
)
875 dsl_pool_t
*dp
= pdd
->dd_pool
;
876 uint64_t dsobj
, ddobj
;
879 ASSERT(lastname
[0] != '@');
881 ddobj
= dsl_dir_create_sync(dp
, pdd
, lastname
, tx
);
882 VERIFY(0 == dsl_dir_open_obj(dp
, ddobj
, lastname
, FTAG
, &dd
));
884 dsobj
= dsl_dataset_create_sync_dd(dd
, origin
, flags
, tx
);
886 dsl_deleg_set_create_perms(dd
, tx
, cr
);
888 dsl_dir_close(dd
, FTAG
);
891 * If we are creating a clone, make sure we zero out any stale
892 * data from the origin snapshots zil header.
894 if (origin
!= NULL
) {
898 VERIFY3U(0, ==, dsl_dataset_hold_obj(dp
, dsobj
, FTAG
, &ds
));
899 VERIFY3U(0, ==, dmu_objset_from_ds(ds
, &os
));
900 bzero(&os
->os_zil_header
, sizeof (os
->os_zil_header
));
901 dsl_dataset_dirty(ds
, tx
);
902 dsl_dataset_rele(ds
, FTAG
);
909 dsl_sync_task_group_t
*dstg
;
916 dsl_snapshot_destroy_one(const char *name
, void *arg
)
918 struct destroyarg
*da
= arg
;
923 dsname
= kmem_asprintf("%s@%s", name
, da
->snapname
);
924 err
= dsl_dataset_own(dsname
, B_TRUE
, da
->dstg
, &ds
);
927 struct dsl_ds_destroyarg
*dsda
;
929 dsl_dataset_make_exclusive(ds
, da
->dstg
);
930 dsda
= kmem_zalloc(sizeof (struct dsl_ds_destroyarg
), KM_SLEEP
);
932 dsda
->defer
= da
->defer
;
933 dsl_sync_task_create(da
->dstg
, dsl_dataset_destroy_check
,
934 dsl_dataset_destroy_sync
, dsda
, da
->dstg
, 0);
935 } else if (err
== ENOENT
) {
938 (void) strcpy(da
->failed
, name
);
944 * Destroy 'snapname' in all descendants of 'fsname'.
946 #pragma weak dmu_snapshots_destroy = dsl_snapshots_destroy
948 dsl_snapshots_destroy(char *fsname
, char *snapname
, boolean_t defer
)
951 struct destroyarg da
;
952 dsl_sync_task_t
*dst
;
955 err
= spa_open(fsname
, &spa
, FTAG
);
958 da
.dstg
= dsl_sync_task_group_create(spa_get_dsl(spa
));
959 da
.snapname
= snapname
;
963 err
= dmu_objset_find(fsname
,
964 dsl_snapshot_destroy_one
, &da
, DS_FIND_CHILDREN
);
967 err
= dsl_sync_task_group_wait(da
.dstg
);
969 for (dst
= list_head(&da
.dstg
->dstg_tasks
); dst
;
970 dst
= list_next(&da
.dstg
->dstg_tasks
, dst
)) {
971 struct dsl_ds_destroyarg
*dsda
= dst
->dst_arg1
;
972 dsl_dataset_t
*ds
= dsda
->ds
;
975 * Return the file system name that triggered the error
978 dsl_dataset_name(ds
, fsname
);
979 *strchr(fsname
, '@') = '\0';
981 ASSERT3P(dsda
->rm_origin
, ==, NULL
);
982 dsl_dataset_disown(ds
, da
.dstg
);
983 kmem_free(dsda
, sizeof (struct dsl_ds_destroyarg
));
986 dsl_sync_task_group_destroy(da
.dstg
);
987 spa_close(spa
, FTAG
);
992 dsl_dataset_might_destroy_origin(dsl_dataset_t
*ds
)
994 boolean_t might_destroy
= B_FALSE
;
996 mutex_enter(&ds
->ds_lock
);
997 if (ds
->ds_phys
->ds_num_children
== 2 && ds
->ds_userrefs
== 0 &&
998 DS_IS_DEFER_DESTROY(ds
))
999 might_destroy
= B_TRUE
;
1000 mutex_exit(&ds
->ds_lock
);
1002 return (might_destroy
);
1006 * If we're removing a clone, and these three conditions are true:
1007 * 1) the clone's origin has no other children
1008 * 2) the clone's origin has no user references
1009 * 3) the clone's origin has been marked for deferred destruction
1010 * Then, prepare to remove the origin as part of this sync task group.
1013 dsl_dataset_origin_rm_prep(struct dsl_ds_destroyarg
*dsda
, void *tag
)
1015 dsl_dataset_t
*ds
= dsda
->ds
;
1016 dsl_dataset_t
*origin
= ds
->ds_prev
;
1018 if (dsl_dataset_might_destroy_origin(origin
)) {
1023 namelen
= dsl_dataset_namelen(origin
) + 1;
1024 name
= kmem_alloc(namelen
, KM_SLEEP
);
1025 dsl_dataset_name(origin
, name
);
1027 error
= zfs_unmount_snap(name
, NULL
);
1029 kmem_free(name
, namelen
);
1033 error
= dsl_dataset_own(name
, B_TRUE
, tag
, &origin
);
1034 kmem_free(name
, namelen
);
1037 dsda
->rm_origin
= origin
;
1038 dsl_dataset_make_exclusive(origin
, tag
);
1045 * ds must be opened as OWNER. On return (whether successful or not),
1046 * ds will be closed and caller can no longer dereference it.
1049 dsl_dataset_destroy(dsl_dataset_t
*ds
, void *tag
, boolean_t defer
)
1052 dsl_sync_task_group_t
*dstg
;
1056 struct dsl_ds_destroyarg dsda
= { 0 };
1057 dsl_dataset_t dummy_ds
= { 0 };
1061 if (dsl_dataset_is_snapshot(ds
)) {
1062 /* Destroying a snapshot is simpler */
1063 dsl_dataset_make_exclusive(ds
, tag
);
1066 err
= dsl_sync_task_do(ds
->ds_dir
->dd_pool
,
1067 dsl_dataset_destroy_check
, dsl_dataset_destroy_sync
,
1069 ASSERT3P(dsda
.rm_origin
, ==, NULL
);
1077 dummy_ds
.ds_dir
= dd
;
1078 dummy_ds
.ds_object
= ds
->ds_object
;
1081 * Check for errors and mark this ds as inconsistent, in
1082 * case we crash while freeing the objects.
1084 err
= dsl_sync_task_do(dd
->dd_pool
, dsl_dataset_destroy_begin_check
,
1085 dsl_dataset_destroy_begin_sync
, ds
, NULL
, 0);
1089 err
= dmu_objset_from_ds(ds
, &os
);
1094 * remove the objects in open context, so that we won't
1095 * have too much to do in syncing context.
1097 for (obj
= 0; err
== 0; err
= dmu_object_next(os
, &obj
, FALSE
,
1098 ds
->ds_phys
->ds_prev_snap_txg
)) {
1100 * Ignore errors, if there is not enough disk space
1101 * we will deal with it in dsl_dataset_destroy_sync().
1103 (void) dmu_free_object(os
, obj
);
1109 * Only the ZIL knows how to free log blocks.
1111 zil_destroy(dmu_objset_zil(os
), B_FALSE
);
1114 * Sync out all in-flight IO.
1116 txg_wait_synced(dd
->dd_pool
, 0);
1119 * If we managed to free all the objects in open
1120 * context, the user space accounting should be zero.
1122 if (ds
->ds_phys
->ds_bp
.blk_fill
== 0 &&
1123 dmu_objset_userused_enabled(os
)) {
1126 ASSERT(zap_count(os
, DMU_USERUSED_OBJECT
, &count
) != 0 ||
1128 ASSERT(zap_count(os
, DMU_GROUPUSED_OBJECT
, &count
) != 0 ||
1132 rw_enter(&dd
->dd_pool
->dp_config_rwlock
, RW_READER
);
1133 err
= dsl_dir_open_obj(dd
->dd_pool
, dd
->dd_object
, NULL
, FTAG
, &dd
);
1134 rw_exit(&dd
->dd_pool
->dp_config_rwlock
);
1140 * Blow away the dsl_dir + head dataset.
1142 dsl_dataset_make_exclusive(ds
, tag
);
1144 * If we're removing a clone, we might also need to remove its
1148 dsda
.need_prep
= B_FALSE
;
1149 if (dsl_dir_is_clone(dd
)) {
1150 err
= dsl_dataset_origin_rm_prep(&dsda
, tag
);
1152 dsl_dir_close(dd
, FTAG
);
1157 dstg
= dsl_sync_task_group_create(ds
->ds_dir
->dd_pool
);
1158 dsl_sync_task_create(dstg
, dsl_dataset_destroy_check
,
1159 dsl_dataset_destroy_sync
, &dsda
, tag
, 0);
1160 dsl_sync_task_create(dstg
, dsl_dir_destroy_check
,
1161 dsl_dir_destroy_sync
, &dummy_ds
, FTAG
, 0);
1162 err
= dsl_sync_task_group_wait(dstg
);
1163 dsl_sync_task_group_destroy(dstg
);
1166 * We could be racing against 'zfs release' or 'zfs destroy -d'
1167 * on the origin snap, in which case we can get EBUSY if we
1168 * needed to destroy the origin snap but were not ready to
1171 if (dsda
.need_prep
) {
1172 ASSERT(err
== EBUSY
);
1173 ASSERT(dsl_dir_is_clone(dd
));
1174 ASSERT(dsda
.rm_origin
== NULL
);
1176 } while (dsda
.need_prep
);
1178 if (dsda
.rm_origin
!= NULL
)
1179 dsl_dataset_disown(dsda
.rm_origin
, tag
);
1181 /* if it is successful, dsl_dir_destroy_sync will close the dd */
1183 dsl_dir_close(dd
, FTAG
);
1185 dsl_dataset_disown(ds
, tag
);
1190 dsl_dataset_get_blkptr(dsl_dataset_t
*ds
)
1192 return (&ds
->ds_phys
->ds_bp
);
1196 dsl_dataset_set_blkptr(dsl_dataset_t
*ds
, blkptr_t
*bp
, dmu_tx_t
*tx
)
1198 ASSERT(dmu_tx_is_syncing(tx
));
1199 /* If it's the meta-objset, set dp_meta_rootbp */
1201 tx
->tx_pool
->dp_meta_rootbp
= *bp
;
1203 dmu_buf_will_dirty(ds
->ds_dbuf
, tx
);
1204 ds
->ds_phys
->ds_bp
= *bp
;
1209 dsl_dataset_get_spa(dsl_dataset_t
*ds
)
1211 return (ds
->ds_dir
->dd_pool
->dp_spa
);
1215 dsl_dataset_dirty(dsl_dataset_t
*ds
, dmu_tx_t
*tx
)
1219 if (ds
== NULL
) /* this is the meta-objset */
1222 ASSERT(ds
->ds_objset
!= NULL
);
1224 if (ds
->ds_phys
->ds_next_snap_obj
!= 0)
1225 panic("dirtying snapshot!");
1227 dp
= ds
->ds_dir
->dd_pool
;
1229 if (txg_list_add(&dp
->dp_dirty_datasets
, ds
, tx
->tx_txg
) == 0) {
1230 /* up the hold count until we can be written out */
1231 dmu_buf_add_ref(ds
->ds_dbuf
, ds
);
1236 * The unique space in the head dataset can be calculated by subtracting
1237 * the space used in the most recent snapshot, that is still being used
1238 * in this file system, from the space currently in use. To figure out
1239 * the space in the most recent snapshot still in use, we need to take
1240 * the total space used in the snapshot and subtract out the space that
1241 * has been freed up since the snapshot was taken.
1244 dsl_dataset_recalc_head_uniq(dsl_dataset_t
*ds
)
1247 uint64_t dlused
, dlcomp
, dluncomp
;
1249 ASSERT(!dsl_dataset_is_snapshot(ds
));
1251 if (ds
->ds_phys
->ds_prev_snap_obj
!= 0)
1252 mrs_used
= ds
->ds_prev
->ds_phys
->ds_used_bytes
;
1256 dsl_deadlist_space(&ds
->ds_deadlist
, &dlused
, &dlcomp
, &dluncomp
);
1258 ASSERT3U(dlused
, <=, mrs_used
);
1259 ds
->ds_phys
->ds_unique_bytes
=
1260 ds
->ds_phys
->ds_used_bytes
- (mrs_used
- dlused
);
1262 if (spa_version(ds
->ds_dir
->dd_pool
->dp_spa
) >=
1263 SPA_VERSION_UNIQUE_ACCURATE
)
1264 ds
->ds_phys
->ds_flags
|= DS_FLAG_UNIQUE_ACCURATE
;
1274 kill_blkptr(spa_t
*spa
, zilog_t
*zilog
, const blkptr_t
*bp
, arc_buf_t
*pbuf
,
1275 const zbookmark_t
*zb
, const dnode_phys_t
*dnp
, void *arg
)
1277 struct killarg
*ka
= arg
;
1278 dmu_tx_t
*tx
= ka
->tx
;
1283 if (zb
->zb_level
== ZB_ZIL_LEVEL
) {
1284 ASSERT(zilog
!= NULL
);
1286 * It's a block in the intent log. It has no
1287 * accounting, so just free it.
1289 dsl_free(ka
->tx
->tx_pool
, ka
->tx
->tx_txg
, bp
);
1291 ASSERT(zilog
== NULL
);
1292 ASSERT3U(bp
->blk_birth
, >, ka
->ds
->ds_phys
->ds_prev_snap_txg
);
1293 (void) dsl_dataset_block_kill(ka
->ds
, bp
, tx
, B_FALSE
);
1301 dsl_dataset_destroy_begin_check(void *arg1
, void *arg2
, dmu_tx_t
*tx
)
1303 dsl_dataset_t
*ds
= arg1
;
1304 objset_t
*mos
= ds
->ds_dir
->dd_pool
->dp_meta_objset
;
1309 * Can't delete a head dataset if there are snapshots of it.
1310 * (Except if the only snapshots are from the branch we cloned
1313 if (ds
->ds_prev
!= NULL
&&
1314 ds
->ds_prev
->ds_phys
->ds_next_snap_obj
== ds
->ds_object
)
1318 * This is really a dsl_dir thing, but check it here so that
1319 * we'll be less likely to leave this dataset inconsistent &
1322 err
= zap_count(mos
, ds
->ds_dir
->dd_phys
->dd_child_dir_zapobj
, &count
);
1333 dsl_dataset_destroy_begin_sync(void *arg1
, void *arg2
, dmu_tx_t
*tx
)
1335 dsl_dataset_t
*ds
= arg1
;
1336 dsl_pool_t
*dp
= ds
->ds_dir
->dd_pool
;
1338 /* Mark it as inconsistent on-disk, in case we crash */
1339 dmu_buf_will_dirty(ds
->ds_dbuf
, tx
);
1340 ds
->ds_phys
->ds_flags
|= DS_FLAG_INCONSISTENT
;
1342 spa_history_log_internal(LOG_DS_DESTROY_BEGIN
, dp
->dp_spa
, tx
,
1343 "dataset = %llu", ds
->ds_object
);
1347 dsl_dataset_origin_check(struct dsl_ds_destroyarg
*dsda
, void *tag
,
1350 dsl_dataset_t
*ds
= dsda
->ds
;
1351 dsl_dataset_t
*ds_prev
= ds
->ds_prev
;
1353 if (dsl_dataset_might_destroy_origin(ds_prev
)) {
1354 struct dsl_ds_destroyarg ndsda
= {0};
1357 * If we're not prepared to remove the origin, don't remove
1360 if (dsda
->rm_origin
== NULL
) {
1361 dsda
->need_prep
= B_TRUE
;
1366 ndsda
.is_origin_rm
= B_TRUE
;
1367 return (dsl_dataset_destroy_check(&ndsda
, tag
, tx
));
1371 * If we're not going to remove the origin after all,
1372 * undo the open context setup.
1374 if (dsda
->rm_origin
!= NULL
) {
1375 dsl_dataset_disown(dsda
->rm_origin
, tag
);
1376 dsda
->rm_origin
= NULL
;
1383 * If you add new checks here, you may need to add
1384 * additional checks to the "temporary" case in
1385 * snapshot_check() in dmu_objset.c.
1389 dsl_dataset_destroy_check(void *arg1
, void *arg2
, dmu_tx_t
*tx
)
1391 struct dsl_ds_destroyarg
*dsda
= arg1
;
1392 dsl_dataset_t
*ds
= dsda
->ds
;
1394 /* we have an owner hold, so noone else can destroy us */
1395 ASSERT(!DSL_DATASET_IS_DESTROYED(ds
));
1398 * Only allow deferred destroy on pools that support it.
1399 * NOTE: deferred destroy is only supported on snapshots.
1402 if (spa_version(ds
->ds_dir
->dd_pool
->dp_spa
) <
1403 SPA_VERSION_USERREFS
)
1405 ASSERT(dsl_dataset_is_snapshot(ds
));
1410 * Can't delete a head dataset if there are snapshots of it.
1411 * (Except if the only snapshots are from the branch we cloned
1414 if (ds
->ds_prev
!= NULL
&&
1415 ds
->ds_prev
->ds_phys
->ds_next_snap_obj
== ds
->ds_object
)
1419 * If we made changes this txg, traverse_dsl_dataset won't find
1422 if (ds
->ds_phys
->ds_bp
.blk_birth
>= tx
->tx_txg
)
1425 if (dsl_dataset_is_snapshot(ds
)) {
1427 * If this snapshot has an elevated user reference count,
1428 * we can't destroy it yet.
1430 if (ds
->ds_userrefs
> 0 && !dsda
->releasing
)
1433 mutex_enter(&ds
->ds_lock
);
1435 * Can't delete a branch point. However, if we're destroying
1436 * a clone and removing its origin due to it having a user
1437 * hold count of 0 and having been marked for deferred destroy,
1438 * it's OK for the origin to have a single clone.
1440 if (ds
->ds_phys
->ds_num_children
>
1441 (dsda
->is_origin_rm
? 2 : 1)) {
1442 mutex_exit(&ds
->ds_lock
);
1445 mutex_exit(&ds
->ds_lock
);
1446 } else if (dsl_dir_is_clone(ds
->ds_dir
)) {
1447 return (dsl_dataset_origin_check(dsda
, arg2
, tx
));
1450 /* XXX we should do some i/o error checking... */
1462 dsl_dataset_refs_gone(dmu_buf_t
*db
, void *argv
)
1464 struct refsarg
*arg
= argv
;
1466 mutex_enter(&arg
->lock
);
1468 cv_signal(&arg
->cv
);
1469 mutex_exit(&arg
->lock
);
1473 dsl_dataset_drain_refs(dsl_dataset_t
*ds
, void *tag
)
1477 mutex_init(&arg
.lock
, NULL
, MUTEX_DEFAULT
, NULL
);
1478 cv_init(&arg
.cv
, NULL
, CV_DEFAULT
, NULL
);
1480 (void) dmu_buf_update_user(ds
->ds_dbuf
, ds
, &arg
, &ds
->ds_phys
,
1481 dsl_dataset_refs_gone
);
1482 dmu_buf_rele(ds
->ds_dbuf
, tag
);
1483 mutex_enter(&arg
.lock
);
1485 cv_wait(&arg
.cv
, &arg
.lock
);
1487 mutex_exit(&arg
.lock
);
1490 mutex_destroy(&arg
.lock
);
1491 cv_destroy(&arg
.cv
);
1495 remove_from_next_clones(dsl_dataset_t
*ds
, uint64_t obj
, dmu_tx_t
*tx
)
1497 objset_t
*mos
= ds
->ds_dir
->dd_pool
->dp_meta_objset
;
1501 ASSERT(ds
->ds_phys
->ds_num_children
>= 2);
1502 err
= zap_remove_int(mos
, ds
->ds_phys
->ds_next_clones_obj
, obj
, tx
);
1504 * The err should not be ENOENT, but a bug in a previous version
1505 * of the code could cause upgrade_clones_cb() to not set
1506 * ds_next_snap_obj when it should, leading to a missing entry.
1507 * If we knew that the pool was created after
1508 * SPA_VERSION_NEXT_CLONES, we could assert that it isn't
1509 * ENOENT. However, at least we can check that we don't have
1510 * too many entries in the next_clones_obj even after failing to
1513 if (err
!= ENOENT
) {
1514 VERIFY3U(err
, ==, 0);
1516 ASSERT3U(0, ==, zap_count(mos
, ds
->ds_phys
->ds_next_clones_obj
,
1518 ASSERT3U(count
, <=, ds
->ds_phys
->ds_num_children
- 2);
1522 dsl_dataset_remove_clones_key(dsl_dataset_t
*ds
, uint64_t mintxg
, dmu_tx_t
*tx
)
1524 objset_t
*mos
= ds
->ds_dir
->dd_pool
->dp_meta_objset
;
1529 * If it is the old version, dd_clones doesn't exist so we can't
1530 * find the clones, but deadlist_remove_key() is a no-op so it
1533 if (ds
->ds_dir
->dd_phys
->dd_clones
== 0)
1536 for (zap_cursor_init(&zc
, mos
, ds
->ds_dir
->dd_phys
->dd_clones
);
1537 zap_cursor_retrieve(&zc
, &za
) == 0;
1538 zap_cursor_advance(&zc
)) {
1539 dsl_dataset_t
*clone
;
1541 VERIFY3U(0, ==, dsl_dataset_hold_obj(ds
->ds_dir
->dd_pool
,
1542 za
.za_first_integer
, FTAG
, &clone
));
1543 if (clone
->ds_dir
->dd_origin_txg
> mintxg
) {
1544 dsl_deadlist_remove_key(&clone
->ds_deadlist
,
1546 dsl_dataset_remove_clones_key(clone
, mintxg
, tx
);
1548 dsl_dataset_rele(clone
, FTAG
);
1550 zap_cursor_fini(&zc
);
1553 struct process_old_arg
{
1555 dsl_dataset_t
*ds_prev
;
1556 boolean_t after_branch_point
;
1558 uint64_t used
, comp
, uncomp
;
1562 process_old_cb(void *arg
, const blkptr_t
*bp
, dmu_tx_t
*tx
)
1564 struct process_old_arg
*poa
= arg
;
1565 dsl_pool_t
*dp
= poa
->ds
->ds_dir
->dd_pool
;
1567 if (bp
->blk_birth
<= poa
->ds
->ds_phys
->ds_prev_snap_txg
) {
1568 dsl_deadlist_insert(&poa
->ds
->ds_deadlist
, bp
, tx
);
1569 if (poa
->ds_prev
&& !poa
->after_branch_point
&&
1571 poa
->ds_prev
->ds_phys
->ds_prev_snap_txg
) {
1572 poa
->ds_prev
->ds_phys
->ds_unique_bytes
+=
1573 bp_get_dsize_sync(dp
->dp_spa
, bp
);
1576 poa
->used
+= bp_get_dsize_sync(dp
->dp_spa
, bp
);
1577 poa
->comp
+= BP_GET_PSIZE(bp
);
1578 poa
->uncomp
+= BP_GET_UCSIZE(bp
);
1579 dsl_free_sync(poa
->pio
, dp
, tx
->tx_txg
, bp
);
1585 process_old_deadlist(dsl_dataset_t
*ds
, dsl_dataset_t
*ds_prev
,
1586 dsl_dataset_t
*ds_next
, boolean_t after_branch_point
, dmu_tx_t
*tx
)
1588 struct process_old_arg poa
= { 0 };
1589 dsl_pool_t
*dp
= ds
->ds_dir
->dd_pool
;
1590 objset_t
*mos
= dp
->dp_meta_objset
;
1592 ASSERT(ds
->ds_deadlist
.dl_oldfmt
);
1593 ASSERT(ds_next
->ds_deadlist
.dl_oldfmt
);
1596 poa
.ds_prev
= ds_prev
;
1597 poa
.after_branch_point
= after_branch_point
;
1598 poa
.pio
= zio_root(dp
->dp_spa
, NULL
, NULL
, ZIO_FLAG_MUSTSUCCEED
);
1599 VERIFY3U(0, ==, bpobj_iterate(&ds_next
->ds_deadlist
.dl_bpobj
,
1600 process_old_cb
, &poa
, tx
));
1601 VERIFY3U(zio_wait(poa
.pio
), ==, 0);
1602 ASSERT3U(poa
.used
, ==, ds
->ds_phys
->ds_unique_bytes
);
1604 /* change snapused */
1605 dsl_dir_diduse_space(ds
->ds_dir
, DD_USED_SNAP
,
1606 -poa
.used
, -poa
.comp
, -poa
.uncomp
, tx
);
1608 /* swap next's deadlist to our deadlist */
1609 dsl_deadlist_close(&ds
->ds_deadlist
);
1610 dsl_deadlist_close(&ds_next
->ds_deadlist
);
1611 SWITCH64(ds_next
->ds_phys
->ds_deadlist_obj
,
1612 ds
->ds_phys
->ds_deadlist_obj
);
1613 dsl_deadlist_open(&ds
->ds_deadlist
, mos
, ds
->ds_phys
->ds_deadlist_obj
);
1614 dsl_deadlist_open(&ds_next
->ds_deadlist
, mos
,
1615 ds_next
->ds_phys
->ds_deadlist_obj
);
1619 dsl_dataset_destroy_sync(void *arg1
, void *tag
, dmu_tx_t
*tx
)
1621 struct dsl_ds_destroyarg
*dsda
= arg1
;
1622 dsl_dataset_t
*ds
= dsda
->ds
;
1624 int after_branch_point
= FALSE
;
1625 dsl_pool_t
*dp
= ds
->ds_dir
->dd_pool
;
1626 objset_t
*mos
= dp
->dp_meta_objset
;
1627 dsl_dataset_t
*ds_prev
= NULL
;
1628 boolean_t wont_destroy
;
1631 wont_destroy
= (dsda
->defer
&&
1632 (ds
->ds_userrefs
> 0 || ds
->ds_phys
->ds_num_children
> 1));
1634 ASSERT(ds
->ds_owner
|| wont_destroy
);
1635 ASSERT(dsda
->defer
|| ds
->ds_phys
->ds_num_children
<= 1);
1636 ASSERT(ds
->ds_prev
== NULL
||
1637 ds
->ds_prev
->ds_phys
->ds_next_snap_obj
!= ds
->ds_object
);
1638 ASSERT3U(ds
->ds_phys
->ds_bp
.blk_birth
, <=, tx
->tx_txg
);
1641 ASSERT(spa_version(dp
->dp_spa
) >= SPA_VERSION_USERREFS
);
1642 dmu_buf_will_dirty(ds
->ds_dbuf
, tx
);
1643 ds
->ds_phys
->ds_flags
|= DS_FLAG_DEFER_DESTROY
;
1647 /* signal any waiters that this dataset is going away */
1648 mutex_enter(&ds
->ds_lock
);
1649 ds
->ds_owner
= dsl_reaper
;
1650 cv_broadcast(&ds
->ds_exclusive_cv
);
1651 mutex_exit(&ds
->ds_lock
);
1653 /* Remove our reservation */
1654 if (ds
->ds_reserved
!= 0) {
1655 dsl_prop_setarg_t psa
;
1658 dsl_prop_setarg_init_uint64(&psa
, "refreservation",
1659 (ZPROP_SRC_NONE
| ZPROP_SRC_LOCAL
| ZPROP_SRC_RECEIVED
),
1661 psa
.psa_effective_value
= 0; /* predict default value */
1663 dsl_dataset_set_reservation_sync(ds
, &psa
, tx
);
1664 ASSERT3U(ds
->ds_reserved
, ==, 0);
1667 ASSERT(RW_WRITE_HELD(&dp
->dp_config_rwlock
));
1669 dsl_scan_ds_destroyed(ds
, tx
);
1671 obj
= ds
->ds_object
;
1673 if (ds
->ds_phys
->ds_prev_snap_obj
!= 0) {
1675 ds_prev
= ds
->ds_prev
;
1677 VERIFY(0 == dsl_dataset_hold_obj(dp
,
1678 ds
->ds_phys
->ds_prev_snap_obj
, FTAG
, &ds_prev
));
1680 after_branch_point
=
1681 (ds_prev
->ds_phys
->ds_next_snap_obj
!= obj
);
1683 dmu_buf_will_dirty(ds_prev
->ds_dbuf
, tx
);
1684 if (after_branch_point
&&
1685 ds_prev
->ds_phys
->ds_next_clones_obj
!= 0) {
1686 remove_from_next_clones(ds_prev
, obj
, tx
);
1687 if (ds
->ds_phys
->ds_next_snap_obj
!= 0) {
1688 VERIFY(0 == zap_add_int(mos
,
1689 ds_prev
->ds_phys
->ds_next_clones_obj
,
1690 ds
->ds_phys
->ds_next_snap_obj
, tx
));
1693 if (after_branch_point
&&
1694 ds
->ds_phys
->ds_next_snap_obj
== 0) {
1695 /* This clone is toast. */
1696 ASSERT(ds_prev
->ds_phys
->ds_num_children
> 1);
1697 ds_prev
->ds_phys
->ds_num_children
--;
1700 * If the clone's origin has no other clones, no
1701 * user holds, and has been marked for deferred
1702 * deletion, then we should have done the necessary
1703 * destroy setup for it.
1705 if (ds_prev
->ds_phys
->ds_num_children
== 1 &&
1706 ds_prev
->ds_userrefs
== 0 &&
1707 DS_IS_DEFER_DESTROY(ds_prev
)) {
1708 ASSERT3P(dsda
->rm_origin
, !=, NULL
);
1710 ASSERT3P(dsda
->rm_origin
, ==, NULL
);
1712 } else if (!after_branch_point
) {
1713 ds_prev
->ds_phys
->ds_next_snap_obj
=
1714 ds
->ds_phys
->ds_next_snap_obj
;
1718 if (dsl_dataset_is_snapshot(ds
)) {
1719 dsl_dataset_t
*ds_next
;
1720 uint64_t old_unique
;
1721 uint64_t used
= 0, comp
= 0, uncomp
= 0;
1723 VERIFY(0 == dsl_dataset_hold_obj(dp
,
1724 ds
->ds_phys
->ds_next_snap_obj
, FTAG
, &ds_next
));
1725 ASSERT3U(ds_next
->ds_phys
->ds_prev_snap_obj
, ==, obj
);
1727 old_unique
= ds_next
->ds_phys
->ds_unique_bytes
;
1729 dmu_buf_will_dirty(ds_next
->ds_dbuf
, tx
);
1730 ds_next
->ds_phys
->ds_prev_snap_obj
=
1731 ds
->ds_phys
->ds_prev_snap_obj
;
1732 ds_next
->ds_phys
->ds_prev_snap_txg
=
1733 ds
->ds_phys
->ds_prev_snap_txg
;
1734 ASSERT3U(ds
->ds_phys
->ds_prev_snap_txg
, ==,
1735 ds_prev
? ds_prev
->ds_phys
->ds_creation_txg
: 0);
1738 if (ds_next
->ds_deadlist
.dl_oldfmt
) {
1739 process_old_deadlist(ds
, ds_prev
, ds_next
,
1740 after_branch_point
, tx
);
1742 /* Adjust prev's unique space. */
1743 if (ds_prev
&& !after_branch_point
) {
1744 dsl_deadlist_space_range(&ds_next
->ds_deadlist
,
1745 ds_prev
->ds_phys
->ds_prev_snap_txg
,
1746 ds
->ds_phys
->ds_prev_snap_txg
,
1747 &used
, &comp
, &uncomp
);
1748 ds_prev
->ds_phys
->ds_unique_bytes
+= used
;
1751 /* Adjust snapused. */
1752 dsl_deadlist_space_range(&ds_next
->ds_deadlist
,
1753 ds
->ds_phys
->ds_prev_snap_txg
, UINT64_MAX
,
1754 &used
, &comp
, &uncomp
);
1755 dsl_dir_diduse_space(ds
->ds_dir
, DD_USED_SNAP
,
1756 -used
, -comp
, -uncomp
, tx
);
1758 /* Move blocks to be freed to pool's free list. */
1759 dsl_deadlist_move_bpobj(&ds_next
->ds_deadlist
,
1760 &dp
->dp_free_bpobj
, ds
->ds_phys
->ds_prev_snap_txg
,
1762 dsl_dir_diduse_space(tx
->tx_pool
->dp_free_dir
,
1763 DD_USED_HEAD
, used
, comp
, uncomp
, tx
);
1764 dsl_dir_dirty(tx
->tx_pool
->dp_free_dir
, tx
);
1766 /* Merge our deadlist into next's and free it. */
1767 dsl_deadlist_merge(&ds_next
->ds_deadlist
,
1768 ds
->ds_phys
->ds_deadlist_obj
, tx
);
1770 dsl_deadlist_close(&ds
->ds_deadlist
);
1771 dsl_deadlist_free(mos
, ds
->ds_phys
->ds_deadlist_obj
, tx
);
1773 /* Collapse range in clone heads */
1774 dsl_dataset_remove_clones_key(ds
,
1775 ds
->ds_phys
->ds_creation_txg
, tx
);
1777 if (dsl_dataset_is_snapshot(ds_next
)) {
1778 dsl_dataset_t
*ds_nextnext
;
1782 * Update next's unique to include blocks which
1783 * were previously shared by only this snapshot
1784 * and it. Those blocks will be born after the
1785 * prev snap and before this snap, and will have
1786 * died after the next snap and before the one
1787 * after that (ie. be on the snap after next's
1790 VERIFY(0 == dsl_dataset_hold_obj(dp
,
1791 ds_next
->ds_phys
->ds_next_snap_obj
,
1792 FTAG
, &ds_nextnext
));
1793 dsl_deadlist_space_range(&ds_nextnext
->ds_deadlist
,
1794 ds
->ds_phys
->ds_prev_snap_txg
,
1795 ds
->ds_phys
->ds_creation_txg
,
1796 &used
, &comp
, &uncomp
);
1797 ds_next
->ds_phys
->ds_unique_bytes
+= used
;
1798 dsl_dataset_rele(ds_nextnext
, FTAG
);
1799 ASSERT3P(ds_next
->ds_prev
, ==, NULL
);
1801 /* Collapse range in this head. */
1802 VERIFY3U(0, ==, dsl_dataset_hold_obj(dp
,
1803 ds
->ds_dir
->dd_phys
->dd_head_dataset_obj
,
1805 dsl_deadlist_remove_key(&hds
->ds_deadlist
,
1806 ds
->ds_phys
->ds_creation_txg
, tx
);
1807 dsl_dataset_rele(hds
, FTAG
);
1810 ASSERT3P(ds_next
->ds_prev
, ==, ds
);
1811 dsl_dataset_drop_ref(ds_next
->ds_prev
, ds_next
);
1812 ds_next
->ds_prev
= NULL
;
1814 VERIFY(0 == dsl_dataset_get_ref(dp
,
1815 ds
->ds_phys
->ds_prev_snap_obj
,
1816 ds_next
, &ds_next
->ds_prev
));
1819 dsl_dataset_recalc_head_uniq(ds_next
);
1822 * Reduce the amount of our unconsmed refreservation
1823 * being charged to our parent by the amount of
1824 * new unique data we have gained.
1826 if (old_unique
< ds_next
->ds_reserved
) {
1828 uint64_t new_unique
=
1829 ds_next
->ds_phys
->ds_unique_bytes
;
1831 ASSERT(old_unique
<= new_unique
);
1832 mrsdelta
= MIN(new_unique
- old_unique
,
1833 ds_next
->ds_reserved
- old_unique
);
1834 dsl_dir_diduse_space(ds
->ds_dir
,
1835 DD_USED_REFRSRV
, -mrsdelta
, 0, 0, tx
);
1838 dsl_dataset_rele(ds_next
, FTAG
);
1841 * There's no next snapshot, so this is a head dataset.
1842 * Destroy the deadlist. Unless it's a clone, the
1843 * deadlist should be empty. (If it's a clone, it's
1844 * safe to ignore the deadlist contents.)
1848 dsl_deadlist_close(&ds
->ds_deadlist
);
1849 dsl_deadlist_free(mos
, ds
->ds_phys
->ds_deadlist_obj
, tx
);
1850 ds
->ds_phys
->ds_deadlist_obj
= 0;
1853 * Free everything that we point to (that's born after
1854 * the previous snapshot, if we are a clone)
1856 * NB: this should be very quick, because we already
1857 * freed all the objects in open context.
1861 err
= traverse_dataset(ds
, ds
->ds_phys
->ds_prev_snap_txg
,
1862 TRAVERSE_POST
, kill_blkptr
, &ka
);
1863 ASSERT3U(err
, ==, 0);
1864 ASSERT(!DS_UNIQUE_IS_ACCURATE(ds
) ||
1865 ds
->ds_phys
->ds_unique_bytes
== 0);
1867 if (ds
->ds_prev
!= NULL
) {
1868 if (spa_version(dp
->dp_spa
) >= SPA_VERSION_DIR_CLONES
) {
1869 VERIFY3U(0, ==, zap_remove_int(mos
,
1870 ds
->ds_prev
->ds_dir
->dd_phys
->dd_clones
,
1871 ds
->ds_object
, tx
));
1873 dsl_dataset_rele(ds
->ds_prev
, ds
);
1874 ds
->ds_prev
= ds_prev
= NULL
;
1879 * This must be done after the dsl_traverse(), because it will
1880 * re-open the objset.
1882 if (ds
->ds_objset
) {
1883 dmu_objset_evict(ds
->ds_objset
);
1884 ds
->ds_objset
= NULL
;
1887 if (ds
->ds_dir
->dd_phys
->dd_head_dataset_obj
== ds
->ds_object
) {
1888 /* Erase the link in the dir */
1889 dmu_buf_will_dirty(ds
->ds_dir
->dd_dbuf
, tx
);
1890 ds
->ds_dir
->dd_phys
->dd_head_dataset_obj
= 0;
1891 ASSERT(ds
->ds_phys
->ds_snapnames_zapobj
!= 0);
1892 err
= zap_destroy(mos
, ds
->ds_phys
->ds_snapnames_zapobj
, tx
);
1895 /* remove from snapshot namespace */
1896 dsl_dataset_t
*ds_head
;
1897 ASSERT(ds
->ds_phys
->ds_snapnames_zapobj
== 0);
1898 VERIFY(0 == dsl_dataset_hold_obj(dp
,
1899 ds
->ds_dir
->dd_phys
->dd_head_dataset_obj
, FTAG
, &ds_head
));
1900 VERIFY(0 == dsl_dataset_get_snapname(ds
));
1905 err
= dsl_dataset_snap_lookup(ds_head
,
1906 ds
->ds_snapname
, &val
);
1907 ASSERT3U(err
, ==, 0);
1908 ASSERT3U(val
, ==, obj
);
1911 err
= dsl_dataset_snap_remove(ds_head
, ds
->ds_snapname
, tx
);
1913 dsl_dataset_rele(ds_head
, FTAG
);
1916 if (ds_prev
&& ds
->ds_prev
!= ds_prev
)
1917 dsl_dataset_rele(ds_prev
, FTAG
);
1919 spa_prop_clear_bootfs(dp
->dp_spa
, ds
->ds_object
, tx
);
1920 spa_history_log_internal(LOG_DS_DESTROY
, dp
->dp_spa
, tx
,
1921 "dataset = %llu", ds
->ds_object
);
1923 if (ds
->ds_phys
->ds_next_clones_obj
!= 0) {
1925 ASSERT(0 == zap_count(mos
,
1926 ds
->ds_phys
->ds_next_clones_obj
, &count
) && count
== 0);
1927 VERIFY(0 == dmu_object_free(mos
,
1928 ds
->ds_phys
->ds_next_clones_obj
, tx
));
1930 if (ds
->ds_phys
->ds_props_obj
!= 0)
1931 VERIFY(0 == zap_destroy(mos
, ds
->ds_phys
->ds_props_obj
, tx
));
1932 if (ds
->ds_phys
->ds_userrefs_obj
!= 0)
1933 VERIFY(0 == zap_destroy(mos
, ds
->ds_phys
->ds_userrefs_obj
, tx
));
1934 dsl_dir_close(ds
->ds_dir
, ds
);
1936 dsl_dataset_drain_refs(ds
, tag
);
1937 VERIFY(0 == dmu_object_free(mos
, obj
, tx
));
1939 if (dsda
->rm_origin
) {
1941 * Remove the origin of the clone we just destroyed.
1943 struct dsl_ds_destroyarg ndsda
= {0};
1945 ndsda
.ds
= dsda
->rm_origin
;
1946 dsl_dataset_destroy_sync(&ndsda
, tag
, tx
);
1951 dsl_dataset_snapshot_reserve_space(dsl_dataset_t
*ds
, dmu_tx_t
*tx
)
1955 if (!dmu_tx_is_syncing(tx
))
1959 * If there's an fs-only reservation, any blocks that might become
1960 * owned by the snapshot dataset must be accommodated by space
1961 * outside of the reservation.
1963 ASSERT(ds
->ds_reserved
== 0 || DS_UNIQUE_IS_ACCURATE(ds
));
1964 asize
= MIN(ds
->ds_phys
->ds_unique_bytes
, ds
->ds_reserved
);
1965 if (asize
> dsl_dir_space_available(ds
->ds_dir
, NULL
, 0, TRUE
))
1969 * Propogate any reserved space for this snapshot to other
1970 * snapshot checks in this sync group.
1973 dsl_dir_willuse_space(ds
->ds_dir
, asize
, tx
);
1979 dsl_dataset_snapshot_check(void *arg1
, void *arg2
, dmu_tx_t
*tx
)
1981 dsl_dataset_t
*ds
= arg1
;
1982 const char *snapname
= arg2
;
1987 * We don't allow multiple snapshots of the same txg. If there
1988 * is already one, try again.
1990 if (ds
->ds_phys
->ds_prev_snap_txg
>= tx
->tx_txg
)
1994 * Check for conflicting name snapshot name.
1996 err
= dsl_dataset_snap_lookup(ds
, snapname
, &value
);
2003 * Check that the dataset's name is not too long. Name consists
2004 * of the dataset's length + 1 for the @-sign + snapshot name's length
2006 if (dsl_dataset_namelen(ds
) + 1 + strlen(snapname
) >= MAXNAMELEN
)
2007 return (ENAMETOOLONG
);
2009 err
= dsl_dataset_snapshot_reserve_space(ds
, tx
);
2013 ds
->ds_trysnap_txg
= tx
->tx_txg
;
2018 dsl_dataset_snapshot_sync(void *arg1
, void *arg2
, dmu_tx_t
*tx
)
2020 dsl_dataset_t
*ds
= arg1
;
2021 const char *snapname
= arg2
;
2022 dsl_pool_t
*dp
= ds
->ds_dir
->dd_pool
;
2024 dsl_dataset_phys_t
*dsphys
;
2025 uint64_t dsobj
, crtxg
;
2026 objset_t
*mos
= dp
->dp_meta_objset
;
2029 ASSERT(RW_WRITE_HELD(&dp
->dp_config_rwlock
));
2032 * The origin's ds_creation_txg has to be < TXG_INITIAL
2034 if (strcmp(snapname
, ORIGIN_DIR_NAME
) == 0)
2039 dsobj
= dmu_object_alloc(mos
, DMU_OT_DSL_DATASET
, 0,
2040 DMU_OT_DSL_DATASET
, sizeof (dsl_dataset_phys_t
), tx
);
2041 VERIFY(0 == dmu_bonus_hold(mos
, dsobj
, FTAG
, &dbuf
));
2042 dmu_buf_will_dirty(dbuf
, tx
);
2043 dsphys
= dbuf
->db_data
;
2044 bzero(dsphys
, sizeof (dsl_dataset_phys_t
));
2045 dsphys
->ds_dir_obj
= ds
->ds_dir
->dd_object
;
2046 dsphys
->ds_fsid_guid
= unique_create();
2047 (void) random_get_pseudo_bytes((void*)&dsphys
->ds_guid
,
2048 sizeof (dsphys
->ds_guid
));
2049 dsphys
->ds_prev_snap_obj
= ds
->ds_phys
->ds_prev_snap_obj
;
2050 dsphys
->ds_prev_snap_txg
= ds
->ds_phys
->ds_prev_snap_txg
;
2051 dsphys
->ds_next_snap_obj
= ds
->ds_object
;
2052 dsphys
->ds_num_children
= 1;
2053 dsphys
->ds_creation_time
= gethrestime_sec();
2054 dsphys
->ds_creation_txg
= crtxg
;
2055 dsphys
->ds_deadlist_obj
= ds
->ds_phys
->ds_deadlist_obj
;
2056 dsphys
->ds_used_bytes
= ds
->ds_phys
->ds_used_bytes
;
2057 dsphys
->ds_compressed_bytes
= ds
->ds_phys
->ds_compressed_bytes
;
2058 dsphys
->ds_uncompressed_bytes
= ds
->ds_phys
->ds_uncompressed_bytes
;
2059 dsphys
->ds_flags
= ds
->ds_phys
->ds_flags
;
2060 dsphys
->ds_bp
= ds
->ds_phys
->ds_bp
;
2061 dmu_buf_rele(dbuf
, FTAG
);
2063 ASSERT3U(ds
->ds_prev
!= 0, ==, ds
->ds_phys
->ds_prev_snap_obj
!= 0);
2065 uint64_t next_clones_obj
=
2066 ds
->ds_prev
->ds_phys
->ds_next_clones_obj
;
2067 ASSERT(ds
->ds_prev
->ds_phys
->ds_next_snap_obj
==
2069 ds
->ds_prev
->ds_phys
->ds_num_children
> 1);
2070 if (ds
->ds_prev
->ds_phys
->ds_next_snap_obj
== ds
->ds_object
) {
2071 dmu_buf_will_dirty(ds
->ds_prev
->ds_dbuf
, tx
);
2072 ASSERT3U(ds
->ds_phys
->ds_prev_snap_txg
, ==,
2073 ds
->ds_prev
->ds_phys
->ds_creation_txg
);
2074 ds
->ds_prev
->ds_phys
->ds_next_snap_obj
= dsobj
;
2075 } else if (next_clones_obj
!= 0) {
2076 remove_from_next_clones(ds
->ds_prev
,
2077 dsphys
->ds_next_snap_obj
, tx
);
2078 VERIFY3U(0, ==, zap_add_int(mos
,
2079 next_clones_obj
, dsobj
, tx
));
2084 * If we have a reference-reservation on this dataset, we will
2085 * need to increase the amount of refreservation being charged
2086 * since our unique space is going to zero.
2088 if (ds
->ds_reserved
) {
2090 ASSERT(DS_UNIQUE_IS_ACCURATE(ds
));
2091 delta
= MIN(ds
->ds_phys
->ds_unique_bytes
, ds
->ds_reserved
);
2092 dsl_dir_diduse_space(ds
->ds_dir
, DD_USED_REFRSRV
,
2096 dmu_buf_will_dirty(ds
->ds_dbuf
, tx
);
2097 zfs_dbgmsg("taking snapshot %s@%s/%llu; newkey=%llu",
2098 ds
->ds_dir
->dd_myname
, snapname
, dsobj
,
2099 ds
->ds_phys
->ds_prev_snap_txg
);
2100 ds
->ds_phys
->ds_deadlist_obj
= dsl_deadlist_clone(&ds
->ds_deadlist
,
2101 UINT64_MAX
, ds
->ds_phys
->ds_prev_snap_obj
, tx
);
2102 dsl_deadlist_close(&ds
->ds_deadlist
);
2103 dsl_deadlist_open(&ds
->ds_deadlist
, mos
, ds
->ds_phys
->ds_deadlist_obj
);
2104 dsl_deadlist_add_key(&ds
->ds_deadlist
,
2105 ds
->ds_phys
->ds_prev_snap_txg
, tx
);
2107 ASSERT3U(ds
->ds_phys
->ds_prev_snap_txg
, <, tx
->tx_txg
);
2108 ds
->ds_phys
->ds_prev_snap_obj
= dsobj
;
2109 ds
->ds_phys
->ds_prev_snap_txg
= crtxg
;
2110 ds
->ds_phys
->ds_unique_bytes
= 0;
2111 if (spa_version(dp
->dp_spa
) >= SPA_VERSION_UNIQUE_ACCURATE
)
2112 ds
->ds_phys
->ds_flags
|= DS_FLAG_UNIQUE_ACCURATE
;
2114 err
= zap_add(mos
, ds
->ds_phys
->ds_snapnames_zapobj
,
2115 snapname
, 8, 1, &dsobj
, tx
);
2119 dsl_dataset_drop_ref(ds
->ds_prev
, ds
);
2120 VERIFY(0 == dsl_dataset_get_ref(dp
,
2121 ds
->ds_phys
->ds_prev_snap_obj
, ds
, &ds
->ds_prev
));
2123 dsl_scan_ds_snapshotted(ds
, tx
);
2125 dsl_dir_snap_cmtime_update(ds
->ds_dir
);
2127 spa_history_log_internal(LOG_DS_SNAPSHOT
, dp
->dp_spa
, tx
,
2128 "dataset = %llu", dsobj
);
2132 dsl_dataset_sync(dsl_dataset_t
*ds
, zio_t
*zio
, dmu_tx_t
*tx
)
2134 ASSERT(dmu_tx_is_syncing(tx
));
2135 ASSERT(ds
->ds_objset
!= NULL
);
2136 ASSERT(ds
->ds_phys
->ds_next_snap_obj
== 0);
2139 * in case we had to change ds_fsid_guid when we opened it,
2142 dmu_buf_will_dirty(ds
->ds_dbuf
, tx
);
2143 ds
->ds_phys
->ds_fsid_guid
= ds
->ds_fsid_guid
;
2145 dsl_dir_dirty(ds
->ds_dir
, tx
);
2146 dmu_objset_sync(ds
->ds_objset
, zio
, tx
);
2150 dsl_dataset_stats(dsl_dataset_t
*ds
, nvlist_t
*nv
)
2152 uint64_t refd
, avail
, uobjs
, aobjs
;
2154 dsl_dir_stats(ds
->ds_dir
, nv
);
2156 dsl_dataset_space(ds
, &refd
, &avail
, &uobjs
, &aobjs
);
2157 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_AVAILABLE
, avail
);
2158 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_REFERENCED
, refd
);
2160 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_CREATION
,
2161 ds
->ds_phys
->ds_creation_time
);
2162 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_CREATETXG
,
2163 ds
->ds_phys
->ds_creation_txg
);
2164 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_REFQUOTA
,
2166 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_REFRESERVATION
,
2168 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_GUID
,
2169 ds
->ds_phys
->ds_guid
);
2170 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_UNIQUE
,
2171 ds
->ds_phys
->ds_unique_bytes
);
2172 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_OBJSETID
,
2174 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_USERREFS
,
2176 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_DEFER_DESTROY
,
2177 DS_IS_DEFER_DESTROY(ds
) ? 1 : 0);
2179 if (ds
->ds_phys
->ds_next_snap_obj
) {
2181 * This is a snapshot; override the dd's space used with
2182 * our unique space and compression ratio.
2184 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_USED
,
2185 ds
->ds_phys
->ds_unique_bytes
);
2186 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_COMPRESSRATIO
,
2187 ds
->ds_phys
->ds_compressed_bytes
== 0 ? 100 :
2188 (ds
->ds_phys
->ds_uncompressed_bytes
* 100 /
2189 ds
->ds_phys
->ds_compressed_bytes
));
2194 dsl_dataset_fast_stat(dsl_dataset_t
*ds
, dmu_objset_stats_t
*stat
)
2196 stat
->dds_creation_txg
= ds
->ds_phys
->ds_creation_txg
;
2197 stat
->dds_inconsistent
= ds
->ds_phys
->ds_flags
& DS_FLAG_INCONSISTENT
;
2198 stat
->dds_guid
= ds
->ds_phys
->ds_guid
;
2199 if (ds
->ds_phys
->ds_next_snap_obj
) {
2200 stat
->dds_is_snapshot
= B_TRUE
;
2201 stat
->dds_num_clones
= ds
->ds_phys
->ds_num_children
- 1;
2203 stat
->dds_is_snapshot
= B_FALSE
;
2204 stat
->dds_num_clones
= 0;
2207 /* clone origin is really a dsl_dir thing... */
2208 rw_enter(&ds
->ds_dir
->dd_pool
->dp_config_rwlock
, RW_READER
);
2209 if (dsl_dir_is_clone(ds
->ds_dir
)) {
2212 VERIFY(0 == dsl_dataset_get_ref(ds
->ds_dir
->dd_pool
,
2213 ds
->ds_dir
->dd_phys
->dd_origin_obj
, FTAG
, &ods
));
2214 dsl_dataset_name(ods
, stat
->dds_origin
);
2215 dsl_dataset_drop_ref(ods
, FTAG
);
2217 stat
->dds_origin
[0] = '\0';
2219 rw_exit(&ds
->ds_dir
->dd_pool
->dp_config_rwlock
);
2223 dsl_dataset_fsid_guid(dsl_dataset_t
*ds
)
2225 return (ds
->ds_fsid_guid
);
2229 dsl_dataset_space(dsl_dataset_t
*ds
,
2230 uint64_t *refdbytesp
, uint64_t *availbytesp
,
2231 uint64_t *usedobjsp
, uint64_t *availobjsp
)
2233 *refdbytesp
= ds
->ds_phys
->ds_used_bytes
;
2234 *availbytesp
= dsl_dir_space_available(ds
->ds_dir
, NULL
, 0, TRUE
);
2235 if (ds
->ds_reserved
> ds
->ds_phys
->ds_unique_bytes
)
2236 *availbytesp
+= ds
->ds_reserved
- ds
->ds_phys
->ds_unique_bytes
;
2237 if (ds
->ds_quota
!= 0) {
2239 * Adjust available bytes according to refquota
2241 if (*refdbytesp
< ds
->ds_quota
)
2242 *availbytesp
= MIN(*availbytesp
,
2243 ds
->ds_quota
- *refdbytesp
);
2247 *usedobjsp
= ds
->ds_phys
->ds_bp
.blk_fill
;
2248 *availobjsp
= DN_MAX_OBJECT
- *usedobjsp
;
2252 dsl_dataset_modified_since_lastsnap(dsl_dataset_t
*ds
)
2254 dsl_pool_t
*dp
= ds
->ds_dir
->dd_pool
;
2256 ASSERT(RW_LOCK_HELD(&dp
->dp_config_rwlock
) ||
2257 dsl_pool_sync_context(dp
));
2258 if (ds
->ds_prev
== NULL
)
2260 if (ds
->ds_phys
->ds_bp
.blk_birth
>
2261 ds
->ds_prev
->ds_phys
->ds_creation_txg
) {
2262 objset_t
*os
, *os_prev
;
2264 * It may be that only the ZIL differs, because it was
2265 * reset in the head. Don't count that as being
2268 if (dmu_objset_from_ds(ds
, &os
) != 0)
2270 if (dmu_objset_from_ds(ds
->ds_prev
, &os_prev
) != 0)
2272 return (bcmp(&os
->os_phys
->os_meta_dnode
,
2273 &os_prev
->os_phys
->os_meta_dnode
,
2274 sizeof (os
->os_phys
->os_meta_dnode
)) != 0);
2281 dsl_dataset_snapshot_rename_check(void *arg1
, void *arg2
, dmu_tx_t
*tx
)
2283 dsl_dataset_t
*ds
= arg1
;
2284 char *newsnapname
= arg2
;
2285 dsl_dir_t
*dd
= ds
->ds_dir
;
2290 err
= dsl_dataset_hold_obj(dd
->dd_pool
,
2291 dd
->dd_phys
->dd_head_dataset_obj
, FTAG
, &hds
);
2295 /* new name better not be in use */
2296 err
= dsl_dataset_snap_lookup(hds
, newsnapname
, &val
);
2297 dsl_dataset_rele(hds
, FTAG
);
2301 else if (err
== ENOENT
)
2304 /* dataset name + 1 for the "@" + the new snapshot name must fit */
2305 if (dsl_dir_namelen(ds
->ds_dir
) + 1 + strlen(newsnapname
) >= MAXNAMELEN
)
2312 dsl_dataset_snapshot_rename_sync(void *arg1
, void *arg2
, dmu_tx_t
*tx
)
2314 dsl_dataset_t
*ds
= arg1
;
2315 const char *newsnapname
= arg2
;
2316 dsl_dir_t
*dd
= ds
->ds_dir
;
2317 objset_t
*mos
= dd
->dd_pool
->dp_meta_objset
;
2321 ASSERT(ds
->ds_phys
->ds_next_snap_obj
!= 0);
2323 VERIFY(0 == dsl_dataset_hold_obj(dd
->dd_pool
,
2324 dd
->dd_phys
->dd_head_dataset_obj
, FTAG
, &hds
));
2326 VERIFY(0 == dsl_dataset_get_snapname(ds
));
2327 err
= dsl_dataset_snap_remove(hds
, ds
->ds_snapname
, tx
);
2328 ASSERT3U(err
, ==, 0);
2329 mutex_enter(&ds
->ds_lock
);
2330 (void) strcpy(ds
->ds_snapname
, newsnapname
);
2331 mutex_exit(&ds
->ds_lock
);
2332 err
= zap_add(mos
, hds
->ds_phys
->ds_snapnames_zapobj
,
2333 ds
->ds_snapname
, 8, 1, &ds
->ds_object
, tx
);
2334 ASSERT3U(err
, ==, 0);
2336 spa_history_log_internal(LOG_DS_RENAME
, dd
->dd_pool
->dp_spa
, tx
,
2337 "dataset = %llu", ds
->ds_object
);
2338 dsl_dataset_rele(hds
, FTAG
);
2341 struct renamesnaparg
{
2342 dsl_sync_task_group_t
*dstg
;
2343 char failed
[MAXPATHLEN
];
2349 dsl_snapshot_rename_one(const char *name
, void *arg
)
2351 struct renamesnaparg
*ra
= arg
;
2352 dsl_dataset_t
*ds
= NULL
;
2356 snapname
= kmem_asprintf("%s@%s", name
, ra
->oldsnap
);
2357 (void) strlcpy(ra
->failed
, snapname
, sizeof (ra
->failed
));
2360 * For recursive snapshot renames the parent won't be changing
2361 * so we just pass name for both the to/from argument.
2363 err
= zfs_secpolicy_rename_perms(snapname
, snapname
, CRED());
2366 return (err
== ENOENT
? 0 : err
);
2371 * For all filesystems undergoing rename, we'll need to unmount it.
2373 (void) zfs_unmount_snap(snapname
, NULL
);
2375 err
= dsl_dataset_hold(snapname
, ra
->dstg
, &ds
);
2378 return (err
== ENOENT
? 0 : err
);
2380 dsl_sync_task_create(ra
->dstg
, dsl_dataset_snapshot_rename_check
,
2381 dsl_dataset_snapshot_rename_sync
, ds
, ra
->newsnap
, 0);
2387 dsl_recursive_rename(char *oldname
, const char *newname
)
2390 struct renamesnaparg
*ra
;
2391 dsl_sync_task_t
*dst
;
2393 char *cp
, *fsname
= spa_strdup(oldname
);
2394 int len
= strlen(oldname
) + 1;
2396 /* truncate the snapshot name to get the fsname */
2397 cp
= strchr(fsname
, '@');
2400 err
= spa_open(fsname
, &spa
, FTAG
);
2402 kmem_free(fsname
, len
);
2405 ra
= kmem_alloc(sizeof (struct renamesnaparg
), KM_SLEEP
);
2406 ra
->dstg
= dsl_sync_task_group_create(spa_get_dsl(spa
));
2408 ra
->oldsnap
= strchr(oldname
, '@') + 1;
2409 ra
->newsnap
= strchr(newname
, '@') + 1;
2412 err
= dmu_objset_find(fsname
, dsl_snapshot_rename_one
, ra
,
2414 kmem_free(fsname
, len
);
2417 err
= dsl_sync_task_group_wait(ra
->dstg
);
2420 for (dst
= list_head(&ra
->dstg
->dstg_tasks
); dst
;
2421 dst
= list_next(&ra
->dstg
->dstg_tasks
, dst
)) {
2422 dsl_dataset_t
*ds
= dst
->dst_arg1
;
2424 dsl_dir_name(ds
->ds_dir
, ra
->failed
);
2425 (void) strlcat(ra
->failed
, "@", sizeof (ra
->failed
));
2426 (void) strlcat(ra
->failed
, ra
->newsnap
,
2427 sizeof (ra
->failed
));
2429 dsl_dataset_rele(ds
, ra
->dstg
);
2433 (void) strlcpy(oldname
, ra
->failed
, sizeof (ra
->failed
));
2435 dsl_sync_task_group_destroy(ra
->dstg
);
2436 kmem_free(ra
, sizeof (struct renamesnaparg
));
2437 spa_close(spa
, FTAG
);
2442 dsl_valid_rename(const char *oldname
, void *arg
)
2444 int delta
= *(int *)arg
;
2446 if (strlen(oldname
) + delta
>= MAXNAMELEN
)
2447 return (ENAMETOOLONG
);
2452 #pragma weak dmu_objset_rename = dsl_dataset_rename
2454 dsl_dataset_rename(char *oldname
, const char *newname
, boolean_t recursive
)
2461 err
= dsl_dir_open(oldname
, FTAG
, &dd
, &tail
);
2466 int delta
= strlen(newname
) - strlen(oldname
);
2468 /* if we're growing, validate child name lengths */
2470 err
= dmu_objset_find(oldname
, dsl_valid_rename
,
2471 &delta
, DS_FIND_CHILDREN
| DS_FIND_SNAPSHOTS
);
2474 err
= dsl_dir_rename(dd
, newname
);
2475 dsl_dir_close(dd
, FTAG
);
2479 if (tail
[0] != '@') {
2480 /* the name ended in a nonexistent component */
2481 dsl_dir_close(dd
, FTAG
);
2485 dsl_dir_close(dd
, FTAG
);
2487 /* new name must be snapshot in same filesystem */
2488 tail
= strchr(newname
, '@');
2492 if (strncmp(oldname
, newname
, tail
- newname
) != 0)
2496 err
= dsl_recursive_rename(oldname
, newname
);
2498 err
= dsl_dataset_hold(oldname
, FTAG
, &ds
);
2502 err
= dsl_sync_task_do(ds
->ds_dir
->dd_pool
,
2503 dsl_dataset_snapshot_rename_check
,
2504 dsl_dataset_snapshot_rename_sync
, ds
, (char *)tail
, 1);
2506 dsl_dataset_rele(ds
, FTAG
);
2512 struct promotenode
{
2518 list_t shared_snaps
, origin_snaps
, clone_snaps
;
2519 dsl_dataset_t
*origin_origin
;
2520 uint64_t used
, comp
, uncomp
, unique
, cloneusedsnap
, originusedsnap
;
2524 static int snaplist_space(list_t
*l
, uint64_t mintxg
, uint64_t *spacep
);
2525 static boolean_t
snaplist_unstable(list_t
*l
);
2528 dsl_dataset_promote_check(void *arg1
, void *arg2
, dmu_tx_t
*tx
)
2530 dsl_dataset_t
*hds
= arg1
;
2531 struct promotearg
*pa
= arg2
;
2532 struct promotenode
*snap
= list_head(&pa
->shared_snaps
);
2533 dsl_dataset_t
*origin_ds
= snap
->ds
;
2537 /* Check that it is a real clone */
2538 if (!dsl_dir_is_clone(hds
->ds_dir
))
2541 /* Since this is so expensive, don't do the preliminary check */
2542 if (!dmu_tx_is_syncing(tx
))
2545 if (hds
->ds_phys
->ds_flags
& DS_FLAG_NOPROMOTE
)
2548 /* compute origin's new unique space */
2549 snap
= list_tail(&pa
->clone_snaps
);
2550 ASSERT3U(snap
->ds
->ds_phys
->ds_prev_snap_obj
, ==, origin_ds
->ds_object
);
2551 dsl_deadlist_space_range(&snap
->ds
->ds_deadlist
,
2552 origin_ds
->ds_phys
->ds_prev_snap_txg
, UINT64_MAX
,
2553 &pa
->unique
, &unused
, &unused
);
2556 * Walk the snapshots that we are moving
2558 * Compute space to transfer. Consider the incremental changes
2559 * to used for each snapshot:
2560 * (my used) = (prev's used) + (blocks born) - (blocks killed)
2561 * So each snapshot gave birth to:
2562 * (blocks born) = (my used) - (prev's used) + (blocks killed)
2563 * So a sequence would look like:
2564 * (uN - u(N-1) + kN) + ... + (u1 - u0 + k1) + (u0 - 0 + k0)
2565 * Which simplifies to:
2566 * uN + kN + kN-1 + ... + k1 + k0
2567 * Note however, if we stop before we reach the ORIGIN we get:
2568 * uN + kN + kN-1 + ... + kM - uM-1
2570 pa
->used
= origin_ds
->ds_phys
->ds_used_bytes
;
2571 pa
->comp
= origin_ds
->ds_phys
->ds_compressed_bytes
;
2572 pa
->uncomp
= origin_ds
->ds_phys
->ds_uncompressed_bytes
;
2573 for (snap
= list_head(&pa
->shared_snaps
); snap
;
2574 snap
= list_next(&pa
->shared_snaps
, snap
)) {
2575 uint64_t val
, dlused
, dlcomp
, dluncomp
;
2576 dsl_dataset_t
*ds
= snap
->ds
;
2578 /* Check that the snapshot name does not conflict */
2579 VERIFY(0 == dsl_dataset_get_snapname(ds
));
2580 err
= dsl_dataset_snap_lookup(hds
, ds
->ds_snapname
, &val
);
2588 /* The very first snapshot does not have a deadlist */
2589 if (ds
->ds_phys
->ds_prev_snap_obj
== 0)
2592 dsl_deadlist_space(&ds
->ds_deadlist
,
2593 &dlused
, &dlcomp
, &dluncomp
);
2596 pa
->uncomp
+= dluncomp
;
2600 * If we are a clone of a clone then we never reached ORIGIN,
2601 * so we need to subtract out the clone origin's used space.
2603 if (pa
->origin_origin
) {
2604 pa
->used
-= pa
->origin_origin
->ds_phys
->ds_used_bytes
;
2605 pa
->comp
-= pa
->origin_origin
->ds_phys
->ds_compressed_bytes
;
2606 pa
->uncomp
-= pa
->origin_origin
->ds_phys
->ds_uncompressed_bytes
;
2609 /* Check that there is enough space here */
2610 err
= dsl_dir_transfer_possible(origin_ds
->ds_dir
, hds
->ds_dir
,
2616 * Compute the amounts of space that will be used by snapshots
2617 * after the promotion (for both origin and clone). For each,
2618 * it is the amount of space that will be on all of their
2619 * deadlists (that was not born before their new origin).
2621 if (hds
->ds_dir
->dd_phys
->dd_flags
& DD_FLAG_USED_BREAKDOWN
) {
2625 * Note, typically this will not be a clone of a clone,
2626 * so dd_origin_txg will be < TXG_INITIAL, so
2627 * these snaplist_space() -> dsl_deadlist_space_range()
2628 * calls will be fast because they do not have to
2629 * iterate over all bps.
2631 snap
= list_head(&pa
->origin_snaps
);
2632 err
= snaplist_space(&pa
->shared_snaps
,
2633 snap
->ds
->ds_dir
->dd_origin_txg
, &pa
->cloneusedsnap
);
2637 err
= snaplist_space(&pa
->clone_snaps
,
2638 snap
->ds
->ds_dir
->dd_origin_txg
, &space
);
2641 pa
->cloneusedsnap
+= space
;
2643 if (origin_ds
->ds_dir
->dd_phys
->dd_flags
& DD_FLAG_USED_BREAKDOWN
) {
2644 err
= snaplist_space(&pa
->origin_snaps
,
2645 origin_ds
->ds_phys
->ds_creation_txg
, &pa
->originusedsnap
);
2652 pa
->err_ds
= snap
->ds
->ds_snapname
;
2657 dsl_dataset_promote_sync(void *arg1
, void *arg2
, dmu_tx_t
*tx
)
2659 dsl_dataset_t
*hds
= arg1
;
2660 struct promotearg
*pa
= arg2
;
2661 struct promotenode
*snap
= list_head(&pa
->shared_snaps
);
2662 dsl_dataset_t
*origin_ds
= snap
->ds
;
2663 dsl_dataset_t
*origin_head
;
2664 dsl_dir_t
*dd
= hds
->ds_dir
;
2665 dsl_pool_t
*dp
= hds
->ds_dir
->dd_pool
;
2666 dsl_dir_t
*odd
= NULL
;
2667 uint64_t oldnext_obj
;
2670 ASSERT(0 == (hds
->ds_phys
->ds_flags
& DS_FLAG_NOPROMOTE
));
2672 snap
= list_head(&pa
->origin_snaps
);
2673 origin_head
= snap
->ds
;
2676 * We need to explicitly open odd, since origin_ds's dd will be
2679 VERIFY(0 == dsl_dir_open_obj(dp
, origin_ds
->ds_dir
->dd_object
,
2682 /* change origin's next snap */
2683 dmu_buf_will_dirty(origin_ds
->ds_dbuf
, tx
);
2684 oldnext_obj
= origin_ds
->ds_phys
->ds_next_snap_obj
;
2685 snap
= list_tail(&pa
->clone_snaps
);
2686 ASSERT3U(snap
->ds
->ds_phys
->ds_prev_snap_obj
, ==, origin_ds
->ds_object
);
2687 origin_ds
->ds_phys
->ds_next_snap_obj
= snap
->ds
->ds_object
;
2689 /* change the origin's next clone */
2690 if (origin_ds
->ds_phys
->ds_next_clones_obj
) {
2691 remove_from_next_clones(origin_ds
, snap
->ds
->ds_object
, tx
);
2692 VERIFY3U(0, ==, zap_add_int(dp
->dp_meta_objset
,
2693 origin_ds
->ds_phys
->ds_next_clones_obj
,
2698 dmu_buf_will_dirty(dd
->dd_dbuf
, tx
);
2699 ASSERT3U(dd
->dd_phys
->dd_origin_obj
, ==, origin_ds
->ds_object
);
2700 dd
->dd_phys
->dd_origin_obj
= odd
->dd_phys
->dd_origin_obj
;
2701 dd
->dd_origin_txg
= origin_head
->ds_dir
->dd_origin_txg
;
2702 dmu_buf_will_dirty(odd
->dd_dbuf
, tx
);
2703 odd
->dd_phys
->dd_origin_obj
= origin_ds
->ds_object
;
2704 origin_head
->ds_dir
->dd_origin_txg
=
2705 origin_ds
->ds_phys
->ds_creation_txg
;
2707 /* change dd_clone entries */
2708 if (spa_version(dp
->dp_spa
) >= SPA_VERSION_DIR_CLONES
) {
2709 VERIFY3U(0, ==, zap_remove_int(dp
->dp_meta_objset
,
2710 odd
->dd_phys
->dd_clones
, hds
->ds_object
, tx
));
2711 VERIFY3U(0, ==, zap_add_int(dp
->dp_meta_objset
,
2712 pa
->origin_origin
->ds_dir
->dd_phys
->dd_clones
,
2713 hds
->ds_object
, tx
));
2715 VERIFY3U(0, ==, zap_remove_int(dp
->dp_meta_objset
,
2716 pa
->origin_origin
->ds_dir
->dd_phys
->dd_clones
,
2717 origin_head
->ds_object
, tx
));
2718 if (dd
->dd_phys
->dd_clones
== 0) {
2719 dd
->dd_phys
->dd_clones
= zap_create(dp
->dp_meta_objset
,
2720 DMU_OT_DSL_CLONES
, DMU_OT_NONE
, 0, tx
);
2722 VERIFY3U(0, ==, zap_add_int(dp
->dp_meta_objset
,
2723 dd
->dd_phys
->dd_clones
, origin_head
->ds_object
, tx
));
2727 /* move snapshots to this dir */
2728 for (snap
= list_head(&pa
->shared_snaps
); snap
;
2729 snap
= list_next(&pa
->shared_snaps
, snap
)) {
2730 dsl_dataset_t
*ds
= snap
->ds
;
2732 /* unregister props as dsl_dir is changing */
2733 if (ds
->ds_objset
) {
2734 dmu_objset_evict(ds
->ds_objset
);
2735 ds
->ds_objset
= NULL
;
2737 /* move snap name entry */
2738 VERIFY(0 == dsl_dataset_get_snapname(ds
));
2739 VERIFY(0 == dsl_dataset_snap_remove(origin_head
,
2740 ds
->ds_snapname
, tx
));
2741 VERIFY(0 == zap_add(dp
->dp_meta_objset
,
2742 hds
->ds_phys
->ds_snapnames_zapobj
, ds
->ds_snapname
,
2743 8, 1, &ds
->ds_object
, tx
));
2745 /* change containing dsl_dir */
2746 dmu_buf_will_dirty(ds
->ds_dbuf
, tx
);
2747 ASSERT3U(ds
->ds_phys
->ds_dir_obj
, ==, odd
->dd_object
);
2748 ds
->ds_phys
->ds_dir_obj
= dd
->dd_object
;
2749 ASSERT3P(ds
->ds_dir
, ==, odd
);
2750 dsl_dir_close(ds
->ds_dir
, ds
);
2751 VERIFY(0 == dsl_dir_open_obj(dp
, dd
->dd_object
,
2752 NULL
, ds
, &ds
->ds_dir
));
2754 /* move any clone references */
2755 if (ds
->ds_phys
->ds_next_clones_obj
&&
2756 spa_version(dp
->dp_spa
) >= SPA_VERSION_DIR_CLONES
) {
2760 for (zap_cursor_init(&zc
, dp
->dp_meta_objset
,
2761 ds
->ds_phys
->ds_next_clones_obj
);
2762 zap_cursor_retrieve(&zc
, &za
) == 0;
2763 zap_cursor_advance(&zc
)) {
2764 dsl_dataset_t
*cnds
;
2767 if (za
.za_first_integer
== oldnext_obj
) {
2769 * We've already moved the
2770 * origin's reference.
2775 VERIFY3U(0, ==, dsl_dataset_hold_obj(dp
,
2776 za
.za_first_integer
, FTAG
, &cnds
));
2777 o
= cnds
->ds_dir
->dd_phys
->dd_head_dataset_obj
;
2779 VERIFY3U(zap_remove_int(dp
->dp_meta_objset
,
2780 odd
->dd_phys
->dd_clones
, o
, tx
), ==, 0);
2781 VERIFY3U(zap_add_int(dp
->dp_meta_objset
,
2782 dd
->dd_phys
->dd_clones
, o
, tx
), ==, 0);
2783 dsl_dataset_rele(cnds
, FTAG
);
2785 zap_cursor_fini(&zc
);
2788 ASSERT3U(dsl_prop_numcb(ds
), ==, 0);
2792 * Change space accounting.
2793 * Note, pa->*usedsnap and dd_used_breakdown[SNAP] will either
2794 * both be valid, or both be 0 (resulting in delta == 0). This
2795 * is true for each of {clone,origin} independently.
2798 delta
= pa
->cloneusedsnap
-
2799 dd
->dd_phys
->dd_used_breakdown
[DD_USED_SNAP
];
2800 ASSERT3S(delta
, >=, 0);
2801 ASSERT3U(pa
->used
, >=, delta
);
2802 dsl_dir_diduse_space(dd
, DD_USED_SNAP
, delta
, 0, 0, tx
);
2803 dsl_dir_diduse_space(dd
, DD_USED_HEAD
,
2804 pa
->used
- delta
, pa
->comp
, pa
->uncomp
, tx
);
2806 delta
= pa
->originusedsnap
-
2807 odd
->dd_phys
->dd_used_breakdown
[DD_USED_SNAP
];
2808 ASSERT3S(delta
, <=, 0);
2809 ASSERT3U(pa
->used
, >=, -delta
);
2810 dsl_dir_diduse_space(odd
, DD_USED_SNAP
, delta
, 0, 0, tx
);
2811 dsl_dir_diduse_space(odd
, DD_USED_HEAD
,
2812 -pa
->used
- delta
, -pa
->comp
, -pa
->uncomp
, tx
);
2814 origin_ds
->ds_phys
->ds_unique_bytes
= pa
->unique
;
2816 /* log history record */
2817 spa_history_log_internal(LOG_DS_PROMOTE
, dd
->dd_pool
->dp_spa
, tx
,
2818 "dataset = %llu", hds
->ds_object
);
2820 dsl_dir_close(odd
, FTAG
);
2823 static char *snaplist_tag
= "snaplist";
2825 * Make a list of dsl_dataset_t's for the snapshots between first_obj
2826 * (exclusive) and last_obj (inclusive). The list will be in reverse
2827 * order (last_obj will be the list_head()). If first_obj == 0, do all
2828 * snapshots back to this dataset's origin.
2831 snaplist_make(dsl_pool_t
*dp
, boolean_t own
,
2832 uint64_t first_obj
, uint64_t last_obj
, list_t
*l
)
2834 uint64_t obj
= last_obj
;
2836 ASSERT(RW_LOCK_HELD(&dp
->dp_config_rwlock
));
2838 list_create(l
, sizeof (struct promotenode
),
2839 offsetof(struct promotenode
, link
));
2841 while (obj
!= first_obj
) {
2843 struct promotenode
*snap
;
2847 err
= dsl_dataset_own_obj(dp
, obj
,
2848 0, snaplist_tag
, &ds
);
2850 dsl_dataset_make_exclusive(ds
, snaplist_tag
);
2852 err
= dsl_dataset_hold_obj(dp
, obj
, snaplist_tag
, &ds
);
2854 if (err
== ENOENT
) {
2855 /* lost race with snapshot destroy */
2856 struct promotenode
*last
= list_tail(l
);
2857 ASSERT(obj
!= last
->ds
->ds_phys
->ds_prev_snap_obj
);
2858 obj
= last
->ds
->ds_phys
->ds_prev_snap_obj
;
2865 first_obj
= ds
->ds_dir
->dd_phys
->dd_origin_obj
;
2867 snap
= kmem_alloc(sizeof (struct promotenode
), KM_SLEEP
);
2869 list_insert_tail(l
, snap
);
2870 obj
= ds
->ds_phys
->ds_prev_snap_obj
;
2877 snaplist_space(list_t
*l
, uint64_t mintxg
, uint64_t *spacep
)
2879 struct promotenode
*snap
;
2882 for (snap
= list_head(l
); snap
; snap
= list_next(l
, snap
)) {
2883 uint64_t used
, comp
, uncomp
;
2884 dsl_deadlist_space_range(&snap
->ds
->ds_deadlist
,
2885 mintxg
, UINT64_MAX
, &used
, &comp
, &uncomp
);
2892 snaplist_destroy(list_t
*l
, boolean_t own
)
2894 struct promotenode
*snap
;
2896 if (!l
|| !list_link_active(&l
->list_head
))
2899 while ((snap
= list_tail(l
)) != NULL
) {
2900 list_remove(l
, snap
);
2902 dsl_dataset_disown(snap
->ds
, snaplist_tag
);
2904 dsl_dataset_rele(snap
->ds
, snaplist_tag
);
2905 kmem_free(snap
, sizeof (struct promotenode
));
2911 * Promote a clone. Nomenclature note:
2912 * "clone" or "cds": the original clone which is being promoted
2913 * "origin" or "ods": the snapshot which is originally clone's origin
2914 * "origin head" or "ohds": the dataset which is the head
2915 * (filesystem/volume) for the origin
2916 * "origin origin": the origin of the origin's filesystem (typically
2917 * NULL, indicating that the clone is not a clone of a clone).
2920 dsl_dataset_promote(const char *name
, char *conflsnap
)
2925 dmu_object_info_t doi
;
2926 struct promotearg pa
= { 0 };
2927 struct promotenode
*snap
;
2930 err
= dsl_dataset_hold(name
, FTAG
, &ds
);
2936 err
= dmu_object_info(dp
->dp_meta_objset
,
2937 ds
->ds_phys
->ds_snapnames_zapobj
, &doi
);
2939 dsl_dataset_rele(ds
, FTAG
);
2943 if (dsl_dataset_is_snapshot(ds
) || dd
->dd_phys
->dd_origin_obj
== 0) {
2944 dsl_dataset_rele(ds
, FTAG
);
2949 * We are going to inherit all the snapshots taken before our
2950 * origin (i.e., our new origin will be our parent's origin).
2951 * Take ownership of them so that we can rename them into our
2954 rw_enter(&dp
->dp_config_rwlock
, RW_READER
);
2956 err
= snaplist_make(dp
, B_TRUE
, 0, dd
->dd_phys
->dd_origin_obj
,
2961 err
= snaplist_make(dp
, B_FALSE
, 0, ds
->ds_object
, &pa
.clone_snaps
);
2965 snap
= list_head(&pa
.shared_snaps
);
2966 ASSERT3U(snap
->ds
->ds_object
, ==, dd
->dd_phys
->dd_origin_obj
);
2967 err
= snaplist_make(dp
, B_FALSE
, dd
->dd_phys
->dd_origin_obj
,
2968 snap
->ds
->ds_dir
->dd_phys
->dd_head_dataset_obj
, &pa
.origin_snaps
);
2972 if (snap
->ds
->ds_dir
->dd_phys
->dd_origin_obj
!= 0) {
2973 err
= dsl_dataset_hold_obj(dp
,
2974 snap
->ds
->ds_dir
->dd_phys
->dd_origin_obj
,
2975 FTAG
, &pa
.origin_origin
);
2981 rw_exit(&dp
->dp_config_rwlock
);
2984 * Add in 128x the snapnames zapobj size, since we will be moving
2985 * a bunch of snapnames to the promoted ds, and dirtying their
2989 err
= dsl_sync_task_do(dp
, dsl_dataset_promote_check
,
2990 dsl_dataset_promote_sync
, ds
, &pa
,
2991 2 + 2 * doi
.doi_physical_blocks_512
);
2992 if (err
&& pa
.err_ds
&& conflsnap
)
2993 (void) strncpy(conflsnap
, pa
.err_ds
, MAXNAMELEN
);
2996 snaplist_destroy(&pa
.shared_snaps
, B_TRUE
);
2997 snaplist_destroy(&pa
.clone_snaps
, B_FALSE
);
2998 snaplist_destroy(&pa
.origin_snaps
, B_FALSE
);
2999 if (pa
.origin_origin
)
3000 dsl_dataset_rele(pa
.origin_origin
, FTAG
);
3001 dsl_dataset_rele(ds
, FTAG
);
3005 struct cloneswaparg
{
3006 dsl_dataset_t
*cds
; /* clone dataset */
3007 dsl_dataset_t
*ohds
; /* origin's head dataset */
3009 int64_t unused_refres_delta
; /* change in unconsumed refreservation */
3014 dsl_dataset_clone_swap_check(void *arg1
, void *arg2
, dmu_tx_t
*tx
)
3016 struct cloneswaparg
*csa
= arg1
;
3018 /* they should both be heads */
3019 if (dsl_dataset_is_snapshot(csa
->cds
) ||
3020 dsl_dataset_is_snapshot(csa
->ohds
))
3023 /* the branch point should be just before them */
3024 if (csa
->cds
->ds_prev
!= csa
->ohds
->ds_prev
)
3027 /* cds should be the clone (unless they are unrelated) */
3028 if (csa
->cds
->ds_prev
!= NULL
&&
3029 csa
->cds
->ds_prev
!= csa
->cds
->ds_dir
->dd_pool
->dp_origin_snap
&&
3030 csa
->ohds
->ds_object
!=
3031 csa
->cds
->ds_prev
->ds_phys
->ds_next_snap_obj
)
3034 /* the clone should be a child of the origin */
3035 if (csa
->cds
->ds_dir
->dd_parent
!= csa
->ohds
->ds_dir
)
3038 /* ohds shouldn't be modified unless 'force' */
3039 if (!csa
->force
&& dsl_dataset_modified_since_lastsnap(csa
->ohds
))
3042 /* adjust amount of any unconsumed refreservation */
3043 csa
->unused_refres_delta
=
3044 (int64_t)MIN(csa
->ohds
->ds_reserved
,
3045 csa
->ohds
->ds_phys
->ds_unique_bytes
) -
3046 (int64_t)MIN(csa
->ohds
->ds_reserved
,
3047 csa
->cds
->ds_phys
->ds_unique_bytes
);
3049 if (csa
->unused_refres_delta
> 0 &&
3050 csa
->unused_refres_delta
>
3051 dsl_dir_space_available(csa
->ohds
->ds_dir
, NULL
, 0, TRUE
))
3054 if (csa
->ohds
->ds_quota
!= 0 &&
3055 csa
->cds
->ds_phys
->ds_unique_bytes
> csa
->ohds
->ds_quota
)
3063 dsl_dataset_clone_swap_sync(void *arg1
, void *arg2
, dmu_tx_t
*tx
)
3065 struct cloneswaparg
*csa
= arg1
;
3066 dsl_pool_t
*dp
= csa
->cds
->ds_dir
->dd_pool
;
3068 ASSERT(csa
->cds
->ds_reserved
== 0);
3069 ASSERT(csa
->ohds
->ds_quota
== 0 ||
3070 csa
->cds
->ds_phys
->ds_unique_bytes
<= csa
->ohds
->ds_quota
);
3072 dmu_buf_will_dirty(csa
->cds
->ds_dbuf
, tx
);
3073 dmu_buf_will_dirty(csa
->ohds
->ds_dbuf
, tx
);
3075 if (csa
->cds
->ds_objset
!= NULL
) {
3076 dmu_objset_evict(csa
->cds
->ds_objset
);
3077 csa
->cds
->ds_objset
= NULL
;
3080 if (csa
->ohds
->ds_objset
!= NULL
) {
3081 dmu_objset_evict(csa
->ohds
->ds_objset
);
3082 csa
->ohds
->ds_objset
= NULL
;
3086 * Reset origin's unique bytes, if it exists.
3088 if (csa
->cds
->ds_prev
) {
3089 dsl_dataset_t
*origin
= csa
->cds
->ds_prev
;
3090 uint64_t comp
, uncomp
;
3092 dmu_buf_will_dirty(origin
->ds_dbuf
, tx
);
3093 dsl_deadlist_space_range(&csa
->cds
->ds_deadlist
,
3094 origin
->ds_phys
->ds_prev_snap_txg
, UINT64_MAX
,
3095 &origin
->ds_phys
->ds_unique_bytes
, &comp
, &uncomp
);
3101 tmp
= csa
->ohds
->ds_phys
->ds_bp
;
3102 csa
->ohds
->ds_phys
->ds_bp
= csa
->cds
->ds_phys
->ds_bp
;
3103 csa
->cds
->ds_phys
->ds_bp
= tmp
;
3106 /* set dd_*_bytes */
3108 int64_t dused
, dcomp
, duncomp
;
3109 uint64_t cdl_used
, cdl_comp
, cdl_uncomp
;
3110 uint64_t odl_used
, odl_comp
, odl_uncomp
;
3112 ASSERT3U(csa
->cds
->ds_dir
->dd_phys
->
3113 dd_used_breakdown
[DD_USED_SNAP
], ==, 0);
3115 dsl_deadlist_space(&csa
->cds
->ds_deadlist
,
3116 &cdl_used
, &cdl_comp
, &cdl_uncomp
);
3117 dsl_deadlist_space(&csa
->ohds
->ds_deadlist
,
3118 &odl_used
, &odl_comp
, &odl_uncomp
);
3120 dused
= csa
->cds
->ds_phys
->ds_used_bytes
+ cdl_used
-
3121 (csa
->ohds
->ds_phys
->ds_used_bytes
+ odl_used
);
3122 dcomp
= csa
->cds
->ds_phys
->ds_compressed_bytes
+ cdl_comp
-
3123 (csa
->ohds
->ds_phys
->ds_compressed_bytes
+ odl_comp
);
3124 duncomp
= csa
->cds
->ds_phys
->ds_uncompressed_bytes
+
3126 (csa
->ohds
->ds_phys
->ds_uncompressed_bytes
+ odl_uncomp
);
3128 dsl_dir_diduse_space(csa
->ohds
->ds_dir
, DD_USED_HEAD
,
3129 dused
, dcomp
, duncomp
, tx
);
3130 dsl_dir_diduse_space(csa
->cds
->ds_dir
, DD_USED_HEAD
,
3131 -dused
, -dcomp
, -duncomp
, tx
);
3134 * The difference in the space used by snapshots is the
3135 * difference in snapshot space due to the head's
3136 * deadlist (since that's the only thing that's
3137 * changing that affects the snapused).
3139 dsl_deadlist_space_range(&csa
->cds
->ds_deadlist
,
3140 csa
->ohds
->ds_dir
->dd_origin_txg
, UINT64_MAX
,
3141 &cdl_used
, &cdl_comp
, &cdl_uncomp
);
3142 dsl_deadlist_space_range(&csa
->ohds
->ds_deadlist
,
3143 csa
->ohds
->ds_dir
->dd_origin_txg
, UINT64_MAX
,
3144 &odl_used
, &odl_comp
, &odl_uncomp
);
3145 dsl_dir_transfer_space(csa
->ohds
->ds_dir
, cdl_used
- odl_used
,
3146 DD_USED_HEAD
, DD_USED_SNAP
, tx
);
3149 /* swap ds_*_bytes */
3150 SWITCH64(csa
->ohds
->ds_phys
->ds_used_bytes
,
3151 csa
->cds
->ds_phys
->ds_used_bytes
);
3152 SWITCH64(csa
->ohds
->ds_phys
->ds_compressed_bytes
,
3153 csa
->cds
->ds_phys
->ds_compressed_bytes
);
3154 SWITCH64(csa
->ohds
->ds_phys
->ds_uncompressed_bytes
,
3155 csa
->cds
->ds_phys
->ds_uncompressed_bytes
);
3156 SWITCH64(csa
->ohds
->ds_phys
->ds_unique_bytes
,
3157 csa
->cds
->ds_phys
->ds_unique_bytes
);
3159 /* apply any parent delta for change in unconsumed refreservation */
3160 dsl_dir_diduse_space(csa
->ohds
->ds_dir
, DD_USED_REFRSRV
,
3161 csa
->unused_refres_delta
, 0, 0, tx
);
3166 dsl_deadlist_close(&csa
->cds
->ds_deadlist
);
3167 dsl_deadlist_close(&csa
->ohds
->ds_deadlist
);
3168 SWITCH64(csa
->ohds
->ds_phys
->ds_deadlist_obj
,
3169 csa
->cds
->ds_phys
->ds_deadlist_obj
);
3170 dsl_deadlist_open(&csa
->cds
->ds_deadlist
, dp
->dp_meta_objset
,
3171 csa
->cds
->ds_phys
->ds_deadlist_obj
);
3172 dsl_deadlist_open(&csa
->ohds
->ds_deadlist
, dp
->dp_meta_objset
,
3173 csa
->ohds
->ds_phys
->ds_deadlist_obj
);
3175 dsl_scan_ds_clone_swapped(csa
->ohds
, csa
->cds
, tx
);
3179 * Swap 'clone' with its origin head datasets. Used at the end of "zfs
3180 * recv" into an existing fs to swizzle the file system to the new
3181 * version, and by "zfs rollback". Can also be used to swap two
3182 * independent head datasets if neither has any snapshots.
3185 dsl_dataset_clone_swap(dsl_dataset_t
*clone
, dsl_dataset_t
*origin_head
,
3188 struct cloneswaparg csa
;
3191 ASSERT(clone
->ds_owner
);
3192 ASSERT(origin_head
->ds_owner
);
3195 * Need exclusive access for the swap. If we're swapping these
3196 * datasets back after an error, we already hold the locks.
3198 if (!RW_WRITE_HELD(&clone
->ds_rwlock
))
3199 rw_enter(&clone
->ds_rwlock
, RW_WRITER
);
3200 if (!RW_WRITE_HELD(&origin_head
->ds_rwlock
) &&
3201 !rw_tryenter(&origin_head
->ds_rwlock
, RW_WRITER
)) {
3202 rw_exit(&clone
->ds_rwlock
);
3203 rw_enter(&origin_head
->ds_rwlock
, RW_WRITER
);
3204 if (!rw_tryenter(&clone
->ds_rwlock
, RW_WRITER
)) {
3205 rw_exit(&origin_head
->ds_rwlock
);
3210 csa
.ohds
= origin_head
;
3212 error
= dsl_sync_task_do(clone
->ds_dir
->dd_pool
,
3213 dsl_dataset_clone_swap_check
,
3214 dsl_dataset_clone_swap_sync
, &csa
, NULL
, 9);
3219 * Given a pool name and a dataset object number in that pool,
3220 * return the name of that dataset.
3223 dsl_dsobj_to_dsname(char *pname
, uint64_t obj
, char *buf
)
3230 if ((error
= spa_open(pname
, &spa
, FTAG
)) != 0)
3232 dp
= spa_get_dsl(spa
);
3233 rw_enter(&dp
->dp_config_rwlock
, RW_READER
);
3234 if ((error
= dsl_dataset_hold_obj(dp
, obj
, FTAG
, &ds
)) == 0) {
3235 dsl_dataset_name(ds
, buf
);
3236 dsl_dataset_rele(ds
, FTAG
);
3238 rw_exit(&dp
->dp_config_rwlock
);
3239 spa_close(spa
, FTAG
);
3245 dsl_dataset_check_quota(dsl_dataset_t
*ds
, boolean_t check_quota
,
3246 uint64_t asize
, uint64_t inflight
, uint64_t *used
, uint64_t *ref_rsrv
)
3250 ASSERT3S(asize
, >, 0);
3253 * *ref_rsrv is the portion of asize that will come from any
3254 * unconsumed refreservation space.
3258 mutex_enter(&ds
->ds_lock
);
3260 * Make a space adjustment for reserved bytes.
3262 if (ds
->ds_reserved
> ds
->ds_phys
->ds_unique_bytes
) {
3264 ds
->ds_reserved
- ds
->ds_phys
->ds_unique_bytes
);
3265 *used
-= (ds
->ds_reserved
- ds
->ds_phys
->ds_unique_bytes
);
3267 asize
- MIN(asize
, parent_delta(ds
, asize
+ inflight
));
3270 if (!check_quota
|| ds
->ds_quota
== 0) {
3271 mutex_exit(&ds
->ds_lock
);
3275 * If they are requesting more space, and our current estimate
3276 * is over quota, they get to try again unless the actual
3277 * on-disk is over quota and there are no pending changes (which
3278 * may free up space for us).
3280 if (ds
->ds_phys
->ds_used_bytes
+ inflight
>= ds
->ds_quota
) {
3281 if (inflight
> 0 || ds
->ds_phys
->ds_used_bytes
< ds
->ds_quota
)
3286 mutex_exit(&ds
->ds_lock
);
3293 dsl_dataset_set_quota_check(void *arg1
, void *arg2
, dmu_tx_t
*tx
)
3295 dsl_dataset_t
*ds
= arg1
;
3296 dsl_prop_setarg_t
*psa
= arg2
;
3299 if (spa_version(ds
->ds_dir
->dd_pool
->dp_spa
) < SPA_VERSION_REFQUOTA
)
3302 if ((err
= dsl_prop_predict_sync(ds
->ds_dir
, psa
)) != 0)
3305 if (psa
->psa_effective_value
== 0)
3308 if (psa
->psa_effective_value
< ds
->ds_phys
->ds_used_bytes
||
3309 psa
->psa_effective_value
< ds
->ds_reserved
)
3315 extern void dsl_prop_set_sync(void *, void *, dmu_tx_t
*);
3318 dsl_dataset_set_quota_sync(void *arg1
, void *arg2
, dmu_tx_t
*tx
)
3320 dsl_dataset_t
*ds
= arg1
;
3321 dsl_prop_setarg_t
*psa
= arg2
;
3322 uint64_t effective_value
= psa
->psa_effective_value
;
3324 dsl_prop_set_sync(ds
, psa
, tx
);
3325 DSL_PROP_CHECK_PREDICTION(ds
->ds_dir
, psa
);
3327 if (ds
->ds_quota
!= effective_value
) {
3328 dmu_buf_will_dirty(ds
->ds_dbuf
, tx
);
3329 ds
->ds_quota
= effective_value
;
3331 spa_history_log_internal(LOG_DS_REFQUOTA
,
3332 ds
->ds_dir
->dd_pool
->dp_spa
, tx
, "%lld dataset = %llu ",
3333 (longlong_t
)ds
->ds_quota
, ds
->ds_object
);
3338 dsl_dataset_set_quota(const char *dsname
, zprop_source_t source
, uint64_t quota
)
3341 dsl_prop_setarg_t psa
;
3344 dsl_prop_setarg_init_uint64(&psa
, "refquota", source
, "a
);
3346 err
= dsl_dataset_hold(dsname
, FTAG
, &ds
);
3351 * If someone removes a file, then tries to set the quota, we
3352 * want to make sure the file freeing takes effect.
3354 txg_wait_open(ds
->ds_dir
->dd_pool
, 0);
3356 err
= dsl_sync_task_do(ds
->ds_dir
->dd_pool
,
3357 dsl_dataset_set_quota_check
, dsl_dataset_set_quota_sync
,
3360 dsl_dataset_rele(ds
, FTAG
);
3365 dsl_dataset_set_reservation_check(void *arg1
, void *arg2
, dmu_tx_t
*tx
)
3367 dsl_dataset_t
*ds
= arg1
;
3368 dsl_prop_setarg_t
*psa
= arg2
;
3369 uint64_t effective_value
;
3373 if (spa_version(ds
->ds_dir
->dd_pool
->dp_spa
) <
3374 SPA_VERSION_REFRESERVATION
)
3377 if (dsl_dataset_is_snapshot(ds
))
3380 if ((err
= dsl_prop_predict_sync(ds
->ds_dir
, psa
)) != 0)
3383 effective_value
= psa
->psa_effective_value
;
3386 * If we are doing the preliminary check in open context, the
3387 * space estimates may be inaccurate.
3389 if (!dmu_tx_is_syncing(tx
))
3392 mutex_enter(&ds
->ds_lock
);
3393 if (!DS_UNIQUE_IS_ACCURATE(ds
))
3394 dsl_dataset_recalc_head_uniq(ds
);
3395 unique
= ds
->ds_phys
->ds_unique_bytes
;
3396 mutex_exit(&ds
->ds_lock
);
3398 if (MAX(unique
, effective_value
) > MAX(unique
, ds
->ds_reserved
)) {
3399 uint64_t delta
= MAX(unique
, effective_value
) -
3400 MAX(unique
, ds
->ds_reserved
);
3402 if (delta
> dsl_dir_space_available(ds
->ds_dir
, NULL
, 0, TRUE
))
3404 if (ds
->ds_quota
> 0 &&
3405 effective_value
> ds
->ds_quota
)
3413 dsl_dataset_set_reservation_sync(void *arg1
, void *arg2
, dmu_tx_t
*tx
)
3415 dsl_dataset_t
*ds
= arg1
;
3416 dsl_prop_setarg_t
*psa
= arg2
;
3417 uint64_t effective_value
= psa
->psa_effective_value
;
3421 dsl_prop_set_sync(ds
, psa
, tx
);
3422 DSL_PROP_CHECK_PREDICTION(ds
->ds_dir
, psa
);
3424 dmu_buf_will_dirty(ds
->ds_dbuf
, tx
);
3426 mutex_enter(&ds
->ds_dir
->dd_lock
);
3427 mutex_enter(&ds
->ds_lock
);
3428 ASSERT(DS_UNIQUE_IS_ACCURATE(ds
));
3429 unique
= ds
->ds_phys
->ds_unique_bytes
;
3430 delta
= MAX(0, (int64_t)(effective_value
- unique
)) -
3431 MAX(0, (int64_t)(ds
->ds_reserved
- unique
));
3432 ds
->ds_reserved
= effective_value
;
3433 mutex_exit(&ds
->ds_lock
);
3435 dsl_dir_diduse_space(ds
->ds_dir
, DD_USED_REFRSRV
, delta
, 0, 0, tx
);
3436 mutex_exit(&ds
->ds_dir
->dd_lock
);
3438 spa_history_log_internal(LOG_DS_REFRESERV
,
3439 ds
->ds_dir
->dd_pool
->dp_spa
, tx
, "%lld dataset = %llu",
3440 (longlong_t
)effective_value
, ds
->ds_object
);
3444 dsl_dataset_set_reservation(const char *dsname
, zprop_source_t source
,
3445 uint64_t reservation
)
3448 dsl_prop_setarg_t psa
;
3451 dsl_prop_setarg_init_uint64(&psa
, "refreservation", source
,
3454 err
= dsl_dataset_hold(dsname
, FTAG
, &ds
);
3458 err
= dsl_sync_task_do(ds
->ds_dir
->dd_pool
,
3459 dsl_dataset_set_reservation_check
,
3460 dsl_dataset_set_reservation_sync
, ds
, &psa
, 0);
3462 dsl_dataset_rele(ds
, FTAG
);
3466 typedef struct zfs_hold_cleanup_arg
{
3469 char htag
[MAXNAMELEN
];
3470 } zfs_hold_cleanup_arg_t
;
3473 dsl_dataset_user_release_onexit(void *arg
)
3475 zfs_hold_cleanup_arg_t
*ca
= arg
;
3477 (void) dsl_dataset_user_release_tmp(ca
->dp
, ca
->dsobj
, ca
->htag
,
3479 kmem_free(ca
, sizeof (zfs_hold_cleanup_arg_t
));
3483 dsl_register_onexit_hold_cleanup(dsl_dataset_t
*ds
, const char *htag
,
3486 zfs_hold_cleanup_arg_t
*ca
;
3488 ca
= kmem_alloc(sizeof (zfs_hold_cleanup_arg_t
), KM_SLEEP
);
3489 ca
->dp
= ds
->ds_dir
->dd_pool
;
3490 ca
->dsobj
= ds
->ds_object
;
3491 (void) strlcpy(ca
->htag
, htag
, sizeof (ca
->htag
));
3492 VERIFY3U(0, ==, zfs_onexit_add_cb(minor
,
3493 dsl_dataset_user_release_onexit
, ca
, NULL
));
3497 * If you add new checks here, you may need to add
3498 * additional checks to the "temporary" case in
3499 * snapshot_check() in dmu_objset.c.
3502 dsl_dataset_user_hold_check(void *arg1
, void *arg2
, dmu_tx_t
*tx
)
3504 dsl_dataset_t
*ds
= arg1
;
3505 struct dsl_ds_holdarg
*ha
= arg2
;
3506 char *htag
= ha
->htag
;
3507 objset_t
*mos
= ds
->ds_dir
->dd_pool
->dp_meta_objset
;
3510 if (spa_version(ds
->ds_dir
->dd_pool
->dp_spa
) < SPA_VERSION_USERREFS
)
3513 if (!dsl_dataset_is_snapshot(ds
))
3516 /* tags must be unique */
3517 mutex_enter(&ds
->ds_lock
);
3518 if (ds
->ds_phys
->ds_userrefs_obj
) {
3519 error
= zap_lookup(mos
, ds
->ds_phys
->ds_userrefs_obj
, htag
,
3523 else if (error
== ENOENT
)
3526 mutex_exit(&ds
->ds_lock
);
3528 if (error
== 0 && ha
->temphold
&&
3529 strlen(htag
) + MAX_TAG_PREFIX_LEN
>= MAXNAMELEN
)
3536 dsl_dataset_user_hold_sync(void *arg1
, void *arg2
, dmu_tx_t
*tx
)
3538 dsl_dataset_t
*ds
= arg1
;
3539 struct dsl_ds_holdarg
*ha
= arg2
;
3540 char *htag
= ha
->htag
;
3541 dsl_pool_t
*dp
= ds
->ds_dir
->dd_pool
;
3542 objset_t
*mos
= dp
->dp_meta_objset
;
3543 uint64_t now
= gethrestime_sec();
3546 mutex_enter(&ds
->ds_lock
);
3547 if (ds
->ds_phys
->ds_userrefs_obj
== 0) {
3549 * This is the first user hold for this dataset. Create
3550 * the userrefs zap object.
3552 dmu_buf_will_dirty(ds
->ds_dbuf
, tx
);
3553 zapobj
= ds
->ds_phys
->ds_userrefs_obj
=
3554 zap_create(mos
, DMU_OT_USERREFS
, DMU_OT_NONE
, 0, tx
);
3556 zapobj
= ds
->ds_phys
->ds_userrefs_obj
;
3559 mutex_exit(&ds
->ds_lock
);
3561 VERIFY(0 == zap_add(mos
, zapobj
, htag
, 8, 1, &now
, tx
));
3564 VERIFY(0 == dsl_pool_user_hold(dp
, ds
->ds_object
,
3568 spa_history_log_internal(LOG_DS_USER_HOLD
,
3569 dp
->dp_spa
, tx
, "<%s> temp = %d dataset = %llu", htag
,
3570 (int)ha
->temphold
, ds
->ds_object
);
3574 dsl_dataset_user_hold_one(const char *dsname
, void *arg
)
3576 struct dsl_ds_holdarg
*ha
= arg
;
3581 /* alloc a buffer to hold dsname@snapname plus terminating NULL */
3582 name
= kmem_asprintf("%s@%s", dsname
, ha
->snapname
);
3583 error
= dsl_dataset_hold(name
, ha
->dstg
, &ds
);
3586 ha
->gotone
= B_TRUE
;
3587 dsl_sync_task_create(ha
->dstg
, dsl_dataset_user_hold_check
,
3588 dsl_dataset_user_hold_sync
, ds
, ha
, 0);
3589 } else if (error
== ENOENT
&& ha
->recursive
) {
3592 (void) strlcpy(ha
->failed
, dsname
, sizeof (ha
->failed
));
3598 dsl_dataset_user_hold_for_send(dsl_dataset_t
*ds
, char *htag
,
3601 struct dsl_ds_holdarg
*ha
;
3604 ha
= kmem_zalloc(sizeof (struct dsl_ds_holdarg
), KM_SLEEP
);
3606 ha
->temphold
= temphold
;
3607 error
= dsl_sync_task_do(ds
->ds_dir
->dd_pool
,
3608 dsl_dataset_user_hold_check
, dsl_dataset_user_hold_sync
,
3610 kmem_free(ha
, sizeof (struct dsl_ds_holdarg
));
3616 dsl_dataset_user_hold(char *dsname
, char *snapname
, char *htag
,
3617 boolean_t recursive
, boolean_t temphold
, int cleanup_fd
)
3619 struct dsl_ds_holdarg
*ha
;
3620 dsl_sync_task_t
*dst
;
3625 if (cleanup_fd
!= -1) {
3626 /* Currently we only support cleanup-on-exit of tempholds. */
3629 error
= zfs_onexit_fd_hold(cleanup_fd
, &minor
);
3634 ha
= kmem_zalloc(sizeof (struct dsl_ds_holdarg
), KM_SLEEP
);
3636 (void) strlcpy(ha
->failed
, dsname
, sizeof (ha
->failed
));
3638 error
= spa_open(dsname
, &spa
, FTAG
);
3640 kmem_free(ha
, sizeof (struct dsl_ds_holdarg
));
3641 if (cleanup_fd
!= -1)
3642 zfs_onexit_fd_rele(cleanup_fd
);
3646 ha
->dstg
= dsl_sync_task_group_create(spa_get_dsl(spa
));
3648 ha
->snapname
= snapname
;
3649 ha
->recursive
= recursive
;
3650 ha
->temphold
= temphold
;
3653 error
= dmu_objset_find(dsname
, dsl_dataset_user_hold_one
,
3654 ha
, DS_FIND_CHILDREN
);
3656 error
= dsl_dataset_user_hold_one(dsname
, ha
);
3659 error
= dsl_sync_task_group_wait(ha
->dstg
);
3661 for (dst
= list_head(&ha
->dstg
->dstg_tasks
); dst
;
3662 dst
= list_next(&ha
->dstg
->dstg_tasks
, dst
)) {
3663 dsl_dataset_t
*ds
= dst
->dst_arg1
;
3666 dsl_dataset_name(ds
, ha
->failed
);
3667 *strchr(ha
->failed
, '@') = '\0';
3668 } else if (error
== 0 && minor
!= 0 && temphold
) {
3670 * If this hold is to be released upon process exit,
3671 * register that action now.
3673 dsl_register_onexit_hold_cleanup(ds
, htag
, minor
);
3675 dsl_dataset_rele(ds
, ha
->dstg
);
3678 if (error
== 0 && recursive
&& !ha
->gotone
)
3682 (void) strlcpy(dsname
, ha
->failed
, sizeof (ha
->failed
));
3684 dsl_sync_task_group_destroy(ha
->dstg
);
3686 kmem_free(ha
, sizeof (struct dsl_ds_holdarg
));
3687 spa_close(spa
, FTAG
);
3688 if (cleanup_fd
!= -1)
3689 zfs_onexit_fd_rele(cleanup_fd
);
3693 struct dsl_ds_releasearg
{
3696 boolean_t own
; /* do we own or just hold ds? */
3700 dsl_dataset_release_might_destroy(dsl_dataset_t
*ds
, const char *htag
,
3701 boolean_t
*might_destroy
)
3703 objset_t
*mos
= ds
->ds_dir
->dd_pool
->dp_meta_objset
;
3708 *might_destroy
= B_FALSE
;
3710 mutex_enter(&ds
->ds_lock
);
3711 zapobj
= ds
->ds_phys
->ds_userrefs_obj
;
3713 /* The tag can't possibly exist */
3714 mutex_exit(&ds
->ds_lock
);
3718 /* Make sure the tag exists */
3719 error
= zap_lookup(mos
, zapobj
, htag
, 8, 1, &tmp
);
3721 mutex_exit(&ds
->ds_lock
);
3722 if (error
== ENOENT
)
3727 if (ds
->ds_userrefs
== 1 && ds
->ds_phys
->ds_num_children
== 1 &&
3728 DS_IS_DEFER_DESTROY(ds
))
3729 *might_destroy
= B_TRUE
;
3731 mutex_exit(&ds
->ds_lock
);
3736 dsl_dataset_user_release_check(void *arg1
, void *tag
, dmu_tx_t
*tx
)
3738 struct dsl_ds_releasearg
*ra
= arg1
;
3739 dsl_dataset_t
*ds
= ra
->ds
;
3740 boolean_t might_destroy
;
3743 if (spa_version(ds
->ds_dir
->dd_pool
->dp_spa
) < SPA_VERSION_USERREFS
)
3746 error
= dsl_dataset_release_might_destroy(ds
, ra
->htag
, &might_destroy
);
3750 if (might_destroy
) {
3751 struct dsl_ds_destroyarg dsda
= {0};
3753 if (dmu_tx_is_syncing(tx
)) {
3755 * If we're not prepared to remove the snapshot,
3756 * we can't allow the release to happen right now.
3762 dsda
.releasing
= B_TRUE
;
3763 return (dsl_dataset_destroy_check(&dsda
, tag
, tx
));
3770 dsl_dataset_user_release_sync(void *arg1
, void *tag
, dmu_tx_t
*tx
)
3772 struct dsl_ds_releasearg
*ra
= arg1
;
3773 dsl_dataset_t
*ds
= ra
->ds
;
3774 dsl_pool_t
*dp
= ds
->ds_dir
->dd_pool
;
3775 objset_t
*mos
= dp
->dp_meta_objset
;
3777 uint64_t dsobj
= ds
->ds_object
;
3781 mutex_enter(&ds
->ds_lock
);
3783 refs
= ds
->ds_userrefs
;
3784 mutex_exit(&ds
->ds_lock
);
3785 error
= dsl_pool_user_release(dp
, ds
->ds_object
, ra
->htag
, tx
);
3786 VERIFY(error
== 0 || error
== ENOENT
);
3787 zapobj
= ds
->ds_phys
->ds_userrefs_obj
;
3788 VERIFY(0 == zap_remove(mos
, zapobj
, ra
->htag
, tx
));
3789 if (ds
->ds_userrefs
== 0 && ds
->ds_phys
->ds_num_children
== 1 &&
3790 DS_IS_DEFER_DESTROY(ds
)) {
3791 struct dsl_ds_destroyarg dsda
= {0};
3795 dsda
.releasing
= B_TRUE
;
3796 /* We already did the destroy_check */
3797 dsl_dataset_destroy_sync(&dsda
, tag
, tx
);
3800 spa_history_log_internal(LOG_DS_USER_RELEASE
,
3801 dp
->dp_spa
, tx
, "<%s> %lld dataset = %llu",
3802 ra
->htag
, (longlong_t
)refs
, dsobj
);
3806 dsl_dataset_user_release_one(const char *dsname
, void *arg
)
3808 struct dsl_ds_holdarg
*ha
= arg
;
3809 struct dsl_ds_releasearg
*ra
;
3812 void *dtag
= ha
->dstg
;
3814 boolean_t own
= B_FALSE
;
3815 boolean_t might_destroy
;
3817 /* alloc a buffer to hold dsname@snapname, plus the terminating NULL */
3818 name
= kmem_asprintf("%s@%s", dsname
, ha
->snapname
);
3819 error
= dsl_dataset_hold(name
, dtag
, &ds
);
3821 if (error
== ENOENT
&& ha
->recursive
)
3823 (void) strlcpy(ha
->failed
, dsname
, sizeof (ha
->failed
));
3827 ha
->gotone
= B_TRUE
;
3829 ASSERT(dsl_dataset_is_snapshot(ds
));
3831 error
= dsl_dataset_release_might_destroy(ds
, ha
->htag
, &might_destroy
);
3833 dsl_dataset_rele(ds
, dtag
);
3837 if (might_destroy
) {
3839 name
= kmem_asprintf("%s@%s", dsname
, ha
->snapname
);
3840 error
= zfs_unmount_snap(name
, NULL
);
3843 dsl_dataset_rele(ds
, dtag
);
3847 if (!dsl_dataset_tryown(ds
, B_TRUE
, dtag
)) {
3848 dsl_dataset_rele(ds
, dtag
);
3852 dsl_dataset_make_exclusive(ds
, dtag
);
3856 ra
= kmem_alloc(sizeof (struct dsl_ds_releasearg
), KM_SLEEP
);
3858 ra
->htag
= ha
->htag
;
3860 dsl_sync_task_create(ha
->dstg
, dsl_dataset_user_release_check
,
3861 dsl_dataset_user_release_sync
, ra
, dtag
, 0);
3867 dsl_dataset_user_release(char *dsname
, char *snapname
, char *htag
,
3868 boolean_t recursive
)
3870 struct dsl_ds_holdarg
*ha
;
3871 dsl_sync_task_t
*dst
;
3876 ha
= kmem_zalloc(sizeof (struct dsl_ds_holdarg
), KM_SLEEP
);
3878 (void) strlcpy(ha
->failed
, dsname
, sizeof (ha
->failed
));
3880 error
= spa_open(dsname
, &spa
, FTAG
);
3882 kmem_free(ha
, sizeof (struct dsl_ds_holdarg
));
3886 ha
->dstg
= dsl_sync_task_group_create(spa_get_dsl(spa
));
3888 ha
->snapname
= snapname
;
3889 ha
->recursive
= recursive
;
3891 error
= dmu_objset_find(dsname
, dsl_dataset_user_release_one
,
3892 ha
, DS_FIND_CHILDREN
);
3894 error
= dsl_dataset_user_release_one(dsname
, ha
);
3897 error
= dsl_sync_task_group_wait(ha
->dstg
);
3899 for (dst
= list_head(&ha
->dstg
->dstg_tasks
); dst
;
3900 dst
= list_next(&ha
->dstg
->dstg_tasks
, dst
)) {
3901 struct dsl_ds_releasearg
*ra
= dst
->dst_arg1
;
3902 dsl_dataset_t
*ds
= ra
->ds
;
3905 dsl_dataset_name(ds
, ha
->failed
);
3908 dsl_dataset_disown(ds
, ha
->dstg
);
3910 dsl_dataset_rele(ds
, ha
->dstg
);
3912 kmem_free(ra
, sizeof (struct dsl_ds_releasearg
));
3915 if (error
== 0 && recursive
&& !ha
->gotone
)
3918 if (error
&& error
!= EBUSY
)
3919 (void) strlcpy(dsname
, ha
->failed
, sizeof (ha
->failed
));
3921 dsl_sync_task_group_destroy(ha
->dstg
);
3922 kmem_free(ha
, sizeof (struct dsl_ds_holdarg
));
3923 spa_close(spa
, FTAG
);
3926 * We can get EBUSY if we were racing with deferred destroy and
3927 * dsl_dataset_user_release_check() hadn't done the necessary
3928 * open context setup. We can also get EBUSY if we're racing
3929 * with destroy and that thread is the ds_owner. Either way
3930 * the busy condition should be transient, and we should retry
3931 * the release operation.
3940 * Called at spa_load time (with retry == B_FALSE) to release a stale
3941 * temporary user hold. Also called by the onexit code (with retry == B_TRUE).
3944 dsl_dataset_user_release_tmp(dsl_pool_t
*dp
, uint64_t dsobj
, char *htag
,
3954 rw_enter(&dp
->dp_config_rwlock
, RW_READER
);
3955 error
= dsl_dataset_hold_obj(dp
, dsobj
, FTAG
, &ds
);
3956 rw_exit(&dp
->dp_config_rwlock
);
3959 namelen
= dsl_dataset_namelen(ds
)+1;
3960 name
= kmem_alloc(namelen
, KM_SLEEP
);
3961 dsl_dataset_name(ds
, name
);
3962 dsl_dataset_rele(ds
, FTAG
);
3964 snap
= strchr(name
, '@');
3967 error
= dsl_dataset_user_release(name
, snap
, htag
, B_FALSE
);
3968 kmem_free(name
, namelen
);
3971 * The object can't have been destroyed because we have a hold,
3972 * but it might have been renamed, resulting in ENOENT. Retry
3973 * if we've been requested to do so.
3975 * It would be nice if we could use the dsobj all the way
3976 * through and avoid ENOENT entirely. But we might need to
3977 * unmount the snapshot, and there's currently no way to lookup
3978 * a vfsp using a ZFS object id.
3980 } while ((error
== ENOENT
) && retry
);
3986 dsl_dataset_get_holds(const char *dsname
, nvlist_t
**nvp
)
3991 err
= dsl_dataset_hold(dsname
, FTAG
, &ds
);
3995 VERIFY(0 == nvlist_alloc(nvp
, NV_UNIQUE_NAME
, KM_SLEEP
));
3996 if (ds
->ds_phys
->ds_userrefs_obj
!= 0) {
3997 zap_attribute_t
*za
;
4000 za
= kmem_alloc(sizeof (zap_attribute_t
), KM_SLEEP
);
4001 for (zap_cursor_init(&zc
, ds
->ds_dir
->dd_pool
->dp_meta_objset
,
4002 ds
->ds_phys
->ds_userrefs_obj
);
4003 zap_cursor_retrieve(&zc
, za
) == 0;
4004 zap_cursor_advance(&zc
)) {
4005 VERIFY(0 == nvlist_add_uint64(*nvp
, za
->za_name
,
4006 za
->za_first_integer
));
4008 zap_cursor_fini(&zc
);
4009 kmem_free(za
, sizeof (zap_attribute_t
));
4011 dsl_dataset_rele(ds
, FTAG
);
4016 * Note, this fuction is used as the callback for dmu_objset_find(). We
4017 * always return 0 so that we will continue to find and process
4018 * inconsistent datasets, even if we encounter an error trying to
4019 * process one of them.
4023 dsl_destroy_inconsistent(const char *dsname
, void *arg
)
4027 if (dsl_dataset_own(dsname
, B_TRUE
, FTAG
, &ds
) == 0) {
4028 if (DS_IS_INCONSISTENT(ds
))
4029 (void) dsl_dataset_destroy(ds
, FTAG
, B_FALSE
);
4031 dsl_dataset_disown(ds
, FTAG
);