4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
22 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
23 * Copyright (c) 2011, 2015 by Delphix. All rights reserved.
24 * Copyright (c) 2014, Joyent, Inc. All rights reserved.
25 * Copyright (c) 2014 RackTop Systems.
26 * Copyright (c) 2014 Spectra Logic Corporation, All rights reserved.
29 #include <sys/dmu_objset.h>
30 #include <sys/dsl_dataset.h>
31 #include <sys/dsl_dir.h>
32 #include <sys/dsl_prop.h>
33 #include <sys/dsl_synctask.h>
34 #include <sys/dmu_traverse.h>
35 #include <sys/dmu_impl.h>
36 #include <sys/dmu_tx.h>
40 #include <sys/zfeature.h>
41 #include <sys/unique.h>
42 #include <sys/zfs_context.h>
43 #include <sys/zfs_ioctl.h>
45 #include <sys/zfs_znode.h>
46 #include <sys/zfs_onexit.h>
48 #include <sys/dsl_scan.h>
49 #include <sys/dsl_deadlist.h>
50 #include <sys/dsl_destroy.h>
51 #include <sys/dsl_userhold.h>
52 #include <sys/dsl_bookmark.h>
53 #include <sys/dmu_send.h>
54 #include <sys/zio_checksum.h>
55 #include <sys/zio_compress.h>
56 #include <zfs_fletcher.h>
59 * The SPA supports block sizes up to 16MB. However, very large blocks
60 * can have an impact on i/o latency (e.g. tying up a spinning disk for
61 * ~300ms), and also potentially on the memory allocator. Therefore,
62 * we do not allow the recordsize to be set larger than zfs_max_recordsize
63 * (default 1MB). Larger blocks can be created by changing this tunable,
64 * and pools with larger blocks can always be imported and used, regardless
67 int zfs_max_recordsize
= 1 * 1024 * 1024;
69 #define SWITCH64(x, y) \
71 uint64_t __tmp = (x); \
76 #define DS_REF_MAX (1ULL << 62)
78 extern inline dsl_dataset_phys_t
*dsl_dataset_phys(dsl_dataset_t
*ds
);
81 * Figure out how much of this delta should be propogated to the dsl_dir
82 * layer. If there's a refreservation, that space has already been
83 * partially accounted for in our ancestors.
86 parent_delta(dsl_dataset_t
*ds
, int64_t delta
)
88 dsl_dataset_phys_t
*ds_phys
;
89 uint64_t old_bytes
, new_bytes
;
91 if (ds
->ds_reserved
== 0)
94 ds_phys
= dsl_dataset_phys(ds
);
95 old_bytes
= MAX(ds_phys
->ds_unique_bytes
, ds
->ds_reserved
);
96 new_bytes
= MAX(ds_phys
->ds_unique_bytes
+ delta
, ds
->ds_reserved
);
98 ASSERT3U(ABS((int64_t)(new_bytes
- old_bytes
)), <=, ABS(delta
));
99 return (new_bytes
- old_bytes
);
103 dsl_dataset_block_born(dsl_dataset_t
*ds
, const blkptr_t
*bp
, dmu_tx_t
*tx
)
105 int used
= bp_get_dsize_sync(tx
->tx_pool
->dp_spa
, bp
);
106 int compressed
= BP_GET_PSIZE(bp
);
107 int uncompressed
= BP_GET_UCSIZE(bp
);
110 dprintf_bp(bp
, "ds=%p", ds
);
112 ASSERT(dmu_tx_is_syncing(tx
));
113 /* It could have been compressed away to nothing */
116 ASSERT(BP_GET_TYPE(bp
) != DMU_OT_NONE
);
117 ASSERT(DMU_OT_IS_VALID(BP_GET_TYPE(bp
)));
119 dsl_pool_mos_diduse_space(tx
->tx_pool
,
120 used
, compressed
, uncompressed
);
124 dmu_buf_will_dirty(ds
->ds_dbuf
, tx
);
125 mutex_enter(&ds
->ds_lock
);
126 delta
= parent_delta(ds
, used
);
127 dsl_dataset_phys(ds
)->ds_referenced_bytes
+= used
;
128 dsl_dataset_phys(ds
)->ds_compressed_bytes
+= compressed
;
129 dsl_dataset_phys(ds
)->ds_uncompressed_bytes
+= uncompressed
;
130 dsl_dataset_phys(ds
)->ds_unique_bytes
+= used
;
132 if (BP_GET_LSIZE(bp
) > SPA_OLD_MAXBLOCKSIZE
) {
133 ds
->ds_feature_activation_needed
[SPA_FEATURE_LARGE_BLOCKS
] =
137 spa_feature_t f
= zio_checksum_to_feature(BP_GET_CHECKSUM(bp
));
138 if (f
!= SPA_FEATURE_NONE
)
139 ds
->ds_feature_activation_needed
[f
] = B_TRUE
;
141 mutex_exit(&ds
->ds_lock
);
142 dsl_dir_diduse_space(ds
->ds_dir
, DD_USED_HEAD
, delta
,
143 compressed
, uncompressed
, tx
);
144 dsl_dir_transfer_space(ds
->ds_dir
, used
- delta
,
145 DD_USED_REFRSRV
, DD_USED_HEAD
, tx
);
149 dsl_dataset_block_kill(dsl_dataset_t
*ds
, const blkptr_t
*bp
, dmu_tx_t
*tx
,
152 int used
= bp_get_dsize_sync(tx
->tx_pool
->dp_spa
, bp
);
153 int compressed
= BP_GET_PSIZE(bp
);
154 int uncompressed
= BP_GET_UCSIZE(bp
);
159 ASSERT(dmu_tx_is_syncing(tx
));
160 ASSERT(bp
->blk_birth
<= tx
->tx_txg
);
163 dsl_free(tx
->tx_pool
, tx
->tx_txg
, bp
);
164 dsl_pool_mos_diduse_space(tx
->tx_pool
,
165 -used
, -compressed
, -uncompressed
);
168 ASSERT3P(tx
->tx_pool
, ==, ds
->ds_dir
->dd_pool
);
170 ASSERT(!ds
->ds_is_snapshot
);
171 dmu_buf_will_dirty(ds
->ds_dbuf
, tx
);
173 if (bp
->blk_birth
> dsl_dataset_phys(ds
)->ds_prev_snap_txg
) {
176 dprintf_bp(bp
, "freeing ds=%llu", ds
->ds_object
);
177 dsl_free(tx
->tx_pool
, tx
->tx_txg
, bp
);
179 mutex_enter(&ds
->ds_lock
);
180 ASSERT(dsl_dataset_phys(ds
)->ds_unique_bytes
>= used
||
181 !DS_UNIQUE_IS_ACCURATE(ds
));
182 delta
= parent_delta(ds
, -used
);
183 dsl_dataset_phys(ds
)->ds_unique_bytes
-= used
;
184 mutex_exit(&ds
->ds_lock
);
185 dsl_dir_diduse_space(ds
->ds_dir
, DD_USED_HEAD
,
186 delta
, -compressed
, -uncompressed
, tx
);
187 dsl_dir_transfer_space(ds
->ds_dir
, -used
- delta
,
188 DD_USED_REFRSRV
, DD_USED_HEAD
, tx
);
190 dprintf_bp(bp
, "putting on dead list: %s", "");
193 * We are here as part of zio's write done callback,
194 * which means we're a zio interrupt thread. We can't
195 * call dsl_deadlist_insert() now because it may block
196 * waiting for I/O. Instead, put bp on the deferred
197 * queue and let dsl_pool_sync() finish the job.
199 bplist_append(&ds
->ds_pending_deadlist
, bp
);
201 dsl_deadlist_insert(&ds
->ds_deadlist
, bp
, tx
);
203 ASSERT3U(ds
->ds_prev
->ds_object
, ==,
204 dsl_dataset_phys(ds
)->ds_prev_snap_obj
);
205 ASSERT(dsl_dataset_phys(ds
->ds_prev
)->ds_num_children
> 0);
206 /* if (bp->blk_birth > prev prev snap txg) prev unique += bs */
207 if (dsl_dataset_phys(ds
->ds_prev
)->ds_next_snap_obj
==
208 ds
->ds_object
&& bp
->blk_birth
>
209 dsl_dataset_phys(ds
->ds_prev
)->ds_prev_snap_txg
) {
210 dmu_buf_will_dirty(ds
->ds_prev
->ds_dbuf
, tx
);
211 mutex_enter(&ds
->ds_prev
->ds_lock
);
212 dsl_dataset_phys(ds
->ds_prev
)->ds_unique_bytes
+= used
;
213 mutex_exit(&ds
->ds_prev
->ds_lock
);
215 if (bp
->blk_birth
> ds
->ds_dir
->dd_origin_txg
) {
216 dsl_dir_transfer_space(ds
->ds_dir
, used
,
217 DD_USED_HEAD
, DD_USED_SNAP
, tx
);
220 mutex_enter(&ds
->ds_lock
);
221 ASSERT3U(dsl_dataset_phys(ds
)->ds_referenced_bytes
, >=, used
);
222 dsl_dataset_phys(ds
)->ds_referenced_bytes
-= used
;
223 ASSERT3U(dsl_dataset_phys(ds
)->ds_compressed_bytes
, >=, compressed
);
224 dsl_dataset_phys(ds
)->ds_compressed_bytes
-= compressed
;
225 ASSERT3U(dsl_dataset_phys(ds
)->ds_uncompressed_bytes
, >=, uncompressed
);
226 dsl_dataset_phys(ds
)->ds_uncompressed_bytes
-= uncompressed
;
227 mutex_exit(&ds
->ds_lock
);
233 dsl_dataset_prev_snap_txg(dsl_dataset_t
*ds
)
235 uint64_t trysnap
= 0;
240 * The snapshot creation could fail, but that would cause an
241 * incorrect FALSE return, which would only result in an
242 * overestimation of the amount of space that an operation would
243 * consume, which is OK.
245 * There's also a small window where we could miss a pending
246 * snapshot, because we could set the sync task in the quiescing
247 * phase. So this should only be used as a guess.
249 if (ds
->ds_trysnap_txg
>
250 spa_last_synced_txg(ds
->ds_dir
->dd_pool
->dp_spa
))
251 trysnap
= ds
->ds_trysnap_txg
;
252 return (MAX(dsl_dataset_phys(ds
)->ds_prev_snap_txg
, trysnap
));
256 dsl_dataset_block_freeable(dsl_dataset_t
*ds
, const blkptr_t
*bp
,
259 if (blk_birth
<= dsl_dataset_prev_snap_txg(ds
) ||
260 (bp
!= NULL
&& BP_IS_HOLE(bp
)))
263 ddt_prefetch(dsl_dataset_get_spa(ds
), bp
);
269 dsl_dataset_evict(void *dbu
)
271 dsl_dataset_t
*ds
= dbu
;
273 ASSERT(ds
->ds_owner
== NULL
);
277 unique_remove(ds
->ds_fsid_guid
);
279 if (ds
->ds_objset
!= NULL
)
280 dmu_objset_evict(ds
->ds_objset
);
283 dsl_dataset_rele(ds
->ds_prev
, ds
);
287 bplist_destroy(&ds
->ds_pending_deadlist
);
288 if (ds
->ds_deadlist
.dl_os
!= NULL
)
289 dsl_deadlist_close(&ds
->ds_deadlist
);
291 dsl_dir_async_rele(ds
->ds_dir
, ds
);
293 ASSERT(!list_link_active(&ds
->ds_synced_link
));
295 list_destroy(&ds
->ds_prop_cbs
);
296 mutex_destroy(&ds
->ds_lock
);
297 mutex_destroy(&ds
->ds_opening_lock
);
298 mutex_destroy(&ds
->ds_sendstream_lock
);
299 refcount_destroy(&ds
->ds_longholds
);
301 kmem_free(ds
, sizeof (dsl_dataset_t
));
305 dsl_dataset_get_snapname(dsl_dataset_t
*ds
)
307 dsl_dataset_phys_t
*headphys
;
310 dsl_pool_t
*dp
= ds
->ds_dir
->dd_pool
;
311 objset_t
*mos
= dp
->dp_meta_objset
;
313 if (ds
->ds_snapname
[0])
315 if (dsl_dataset_phys(ds
)->ds_next_snap_obj
== 0)
318 err
= dmu_bonus_hold(mos
, dsl_dir_phys(ds
->ds_dir
)->dd_head_dataset_obj
,
322 headphys
= headdbuf
->db_data
;
323 err
= zap_value_search(dp
->dp_meta_objset
,
324 headphys
->ds_snapnames_zapobj
, ds
->ds_object
, 0, ds
->ds_snapname
);
325 dmu_buf_rele(headdbuf
, FTAG
);
330 dsl_dataset_snap_lookup(dsl_dataset_t
*ds
, const char *name
, uint64_t *value
)
332 objset_t
*mos
= ds
->ds_dir
->dd_pool
->dp_meta_objset
;
333 uint64_t snapobj
= dsl_dataset_phys(ds
)->ds_snapnames_zapobj
;
337 if (dsl_dataset_phys(ds
)->ds_flags
& DS_FLAG_CI_DATASET
)
342 err
= zap_lookup_norm(mos
, snapobj
, name
, 8, 1,
343 value
, mt
, NULL
, 0, NULL
);
344 if (err
== ENOTSUP
&& mt
== MT_FIRST
)
345 err
= zap_lookup(mos
, snapobj
, name
, 8, 1, value
);
350 dsl_dataset_snap_remove(dsl_dataset_t
*ds
, const char *name
, dmu_tx_t
*tx
,
353 objset_t
*mos
= ds
->ds_dir
->dd_pool
->dp_meta_objset
;
354 uint64_t snapobj
= dsl_dataset_phys(ds
)->ds_snapnames_zapobj
;
358 dsl_dir_snap_cmtime_update(ds
->ds_dir
);
360 if (dsl_dataset_phys(ds
)->ds_flags
& DS_FLAG_CI_DATASET
)
365 err
= zap_remove_norm(mos
, snapobj
, name
, mt
, tx
);
366 if (err
== ENOTSUP
&& mt
== MT_FIRST
)
367 err
= zap_remove(mos
, snapobj
, name
, tx
);
369 if (err
== 0 && adj_cnt
)
370 dsl_fs_ss_count_adjust(ds
->ds_dir
, -1,
371 DD_FIELD_SNAPSHOT_COUNT
, tx
);
377 dsl_dataset_try_add_ref(dsl_pool_t
*dp
, dsl_dataset_t
*ds
, void *tag
)
379 dmu_buf_t
*dbuf
= ds
->ds_dbuf
;
380 boolean_t result
= B_FALSE
;
382 if (dbuf
!= NULL
&& dmu_buf_try_add_ref(dbuf
, dp
->dp_meta_objset
,
383 ds
->ds_object
, DMU_BONUS_BLKID
, tag
)) {
385 if (ds
== dmu_buf_get_user(dbuf
))
388 dmu_buf_rele(dbuf
, tag
);
395 dsl_dataset_hold_obj(dsl_pool_t
*dp
, uint64_t dsobj
, void *tag
,
398 objset_t
*mos
= dp
->dp_meta_objset
;
402 dmu_object_info_t doi
;
404 ASSERT(dsl_pool_config_held(dp
));
406 err
= dmu_bonus_hold(mos
, dsobj
, tag
, &dbuf
);
410 /* Make sure dsobj has the correct object type. */
411 dmu_object_info_from_db(dbuf
, &doi
);
412 if (doi
.doi_bonus_type
!= DMU_OT_DSL_DATASET
) {
413 dmu_buf_rele(dbuf
, tag
);
414 return (SET_ERROR(EINVAL
));
417 ds
= dmu_buf_get_user(dbuf
);
419 dsl_dataset_t
*winner
= NULL
;
421 ds
= kmem_zalloc(sizeof (dsl_dataset_t
), KM_SLEEP
);
423 ds
->ds_object
= dsobj
;
424 ds
->ds_is_snapshot
= dsl_dataset_phys(ds
)->ds_num_children
!= 0;
426 mutex_init(&ds
->ds_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
427 mutex_init(&ds
->ds_opening_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
428 mutex_init(&ds
->ds_sendstream_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
429 refcount_create(&ds
->ds_longholds
);
431 bplist_create(&ds
->ds_pending_deadlist
);
432 dsl_deadlist_open(&ds
->ds_deadlist
,
433 mos
, dsl_dataset_phys(ds
)->ds_deadlist_obj
);
435 list_create(&ds
->ds_sendstreams
, sizeof (dmu_sendarg_t
),
436 offsetof(dmu_sendarg_t
, dsa_link
));
438 list_create(&ds
->ds_prop_cbs
, sizeof (dsl_prop_cb_record_t
),
439 offsetof(dsl_prop_cb_record_t
, cbr_ds_node
));
441 if (doi
.doi_type
== DMU_OTN_ZAP_METADATA
) {
442 for (spa_feature_t f
= 0; f
< SPA_FEATURES
; f
++) {
443 if (!(spa_feature_table
[f
].fi_flags
&
444 ZFEATURE_FLAG_PER_DATASET
))
446 err
= zap_contains(mos
, dsobj
,
447 spa_feature_table
[f
].fi_guid
);
449 ds
->ds_feature_inuse
[f
] = B_TRUE
;
451 ASSERT3U(err
, ==, ENOENT
);
457 err
= dsl_dir_hold_obj(dp
,
458 dsl_dataset_phys(ds
)->ds_dir_obj
, NULL
, ds
, &ds
->ds_dir
);
460 mutex_destroy(&ds
->ds_lock
);
461 mutex_destroy(&ds
->ds_opening_lock
);
462 mutex_destroy(&ds
->ds_sendstream_lock
);
463 refcount_destroy(&ds
->ds_longholds
);
464 bplist_destroy(&ds
->ds_pending_deadlist
);
465 dsl_deadlist_close(&ds
->ds_deadlist
);
466 kmem_free(ds
, sizeof (dsl_dataset_t
));
467 dmu_buf_rele(dbuf
, tag
);
471 if (!ds
->ds_is_snapshot
) {
472 ds
->ds_snapname
[0] = '\0';
473 if (dsl_dataset_phys(ds
)->ds_prev_snap_obj
!= 0) {
474 err
= dsl_dataset_hold_obj(dp
,
475 dsl_dataset_phys(ds
)->ds_prev_snap_obj
,
478 if (doi
.doi_type
== DMU_OTN_ZAP_METADATA
) {
479 int zaperr
= zap_lookup(mos
, ds
->ds_object
,
480 DS_FIELD_BOOKMARK_NAMES
,
481 sizeof (ds
->ds_bookmarks
), 1,
483 if (zaperr
!= ENOENT
)
487 if (zfs_flags
& ZFS_DEBUG_SNAPNAMES
)
488 err
= dsl_dataset_get_snapname(ds
);
490 dsl_dataset_phys(ds
)->ds_userrefs_obj
!= 0) {
492 ds
->ds_dir
->dd_pool
->dp_meta_objset
,
493 dsl_dataset_phys(ds
)->ds_userrefs_obj
,
498 if (err
== 0 && !ds
->ds_is_snapshot
) {
499 err
= dsl_prop_get_int_ds(ds
,
500 zfs_prop_to_name(ZFS_PROP_REFRESERVATION
),
503 err
= dsl_prop_get_int_ds(ds
,
504 zfs_prop_to_name(ZFS_PROP_REFQUOTA
),
508 ds
->ds_reserved
= ds
->ds_quota
= 0;
511 dmu_buf_init_user(&ds
->ds_dbu
, dsl_dataset_evict
, &ds
->ds_dbuf
);
513 winner
= dmu_buf_set_user_ie(dbuf
, &ds
->ds_dbu
);
515 if (err
!= 0 || winner
!= NULL
) {
516 bplist_destroy(&ds
->ds_pending_deadlist
);
517 dsl_deadlist_close(&ds
->ds_deadlist
);
519 dsl_dataset_rele(ds
->ds_prev
, ds
);
520 dsl_dir_rele(ds
->ds_dir
, ds
);
521 mutex_destroy(&ds
->ds_lock
);
522 mutex_destroy(&ds
->ds_opening_lock
);
523 mutex_destroy(&ds
->ds_sendstream_lock
);
524 refcount_destroy(&ds
->ds_longholds
);
525 kmem_free(ds
, sizeof (dsl_dataset_t
));
527 dmu_buf_rele(dbuf
, tag
);
533 unique_insert(dsl_dataset_phys(ds
)->ds_fsid_guid
);
536 ASSERT3P(ds
->ds_dbuf
, ==, dbuf
);
537 ASSERT3P(dsl_dataset_phys(ds
), ==, dbuf
->db_data
);
538 ASSERT(dsl_dataset_phys(ds
)->ds_prev_snap_obj
!= 0 ||
539 spa_version(dp
->dp_spa
) < SPA_VERSION_ORIGIN
||
540 dp
->dp_origin_snap
== NULL
|| ds
== dp
->dp_origin_snap
);
546 dsl_dataset_hold(dsl_pool_t
*dp
, const char *name
,
547 void *tag
, dsl_dataset_t
**dsp
)
550 const char *snapname
;
555 err
= dsl_dir_hold(dp
, name
, FTAG
, &dd
, &snapname
);
559 ASSERT(dsl_pool_config_held(dp
));
560 obj
= dsl_dir_phys(dd
)->dd_head_dataset_obj
;
562 err
= dsl_dataset_hold_obj(dp
, obj
, tag
, &ds
);
564 err
= SET_ERROR(ENOENT
);
566 /* we may be looking for a snapshot */
567 if (err
== 0 && snapname
!= NULL
) {
568 dsl_dataset_t
*snap_ds
;
570 if (*snapname
++ != '@') {
571 dsl_dataset_rele(ds
, tag
);
572 dsl_dir_rele(dd
, FTAG
);
573 return (SET_ERROR(ENOENT
));
576 dprintf("looking for snapshot '%s'\n", snapname
);
577 err
= dsl_dataset_snap_lookup(ds
, snapname
, &obj
);
579 err
= dsl_dataset_hold_obj(dp
, obj
, tag
, &snap_ds
);
580 dsl_dataset_rele(ds
, tag
);
583 mutex_enter(&snap_ds
->ds_lock
);
584 if (snap_ds
->ds_snapname
[0] == 0)
585 (void) strlcpy(snap_ds
->ds_snapname
, snapname
,
586 sizeof (snap_ds
->ds_snapname
));
587 mutex_exit(&snap_ds
->ds_lock
);
593 dsl_dir_rele(dd
, FTAG
);
598 dsl_dataset_own_obj(dsl_pool_t
*dp
, uint64_t dsobj
,
599 void *tag
, dsl_dataset_t
**dsp
)
601 int err
= dsl_dataset_hold_obj(dp
, dsobj
, tag
, dsp
);
604 if (!dsl_dataset_tryown(*dsp
, tag
)) {
605 dsl_dataset_rele(*dsp
, tag
);
607 return (SET_ERROR(EBUSY
));
613 dsl_dataset_own(dsl_pool_t
*dp
, const char *name
,
614 void *tag
, dsl_dataset_t
**dsp
)
616 int err
= dsl_dataset_hold(dp
, name
, tag
, dsp
);
619 if (!dsl_dataset_tryown(*dsp
, tag
)) {
620 dsl_dataset_rele(*dsp
, tag
);
621 return (SET_ERROR(EBUSY
));
627 * See the comment above dsl_pool_hold() for details. In summary, a long
628 * hold is used to prevent destruction of a dataset while the pool hold
629 * is dropped, allowing other concurrent operations (e.g. spa_sync()).
631 * The dataset and pool must be held when this function is called. After it
632 * is called, the pool hold may be released while the dataset is still held
636 dsl_dataset_long_hold(dsl_dataset_t
*ds
, void *tag
)
638 ASSERT(dsl_pool_config_held(ds
->ds_dir
->dd_pool
));
639 (void) refcount_add(&ds
->ds_longholds
, tag
);
643 dsl_dataset_long_rele(dsl_dataset_t
*ds
, void *tag
)
645 (void) refcount_remove(&ds
->ds_longholds
, tag
);
648 /* Return B_TRUE if there are any long holds on this dataset. */
650 dsl_dataset_long_held(dsl_dataset_t
*ds
)
652 return (!refcount_is_zero(&ds
->ds_longholds
));
656 dsl_dataset_name(dsl_dataset_t
*ds
, char *name
)
659 (void) strcpy(name
, "mos");
661 dsl_dir_name(ds
->ds_dir
, name
);
662 VERIFY0(dsl_dataset_get_snapname(ds
));
663 if (ds
->ds_snapname
[0]) {
664 (void) strcat(name
, "@");
666 * We use a "recursive" mutex so that we
667 * can call dprintf_ds() with ds_lock held.
669 if (!MUTEX_HELD(&ds
->ds_lock
)) {
670 mutex_enter(&ds
->ds_lock
);
671 (void) strcat(name
, ds
->ds_snapname
);
672 mutex_exit(&ds
->ds_lock
);
674 (void) strcat(name
, ds
->ds_snapname
);
681 dsl_dataset_rele(dsl_dataset_t
*ds
, void *tag
)
683 dmu_buf_rele(ds
->ds_dbuf
, tag
);
687 dsl_dataset_disown(dsl_dataset_t
*ds
, void *tag
)
689 ASSERT3P(ds
->ds_owner
, ==, tag
);
690 ASSERT(ds
->ds_dbuf
!= NULL
);
692 mutex_enter(&ds
->ds_lock
);
694 mutex_exit(&ds
->ds_lock
);
695 dsl_dataset_long_rele(ds
, tag
);
696 dsl_dataset_rele(ds
, tag
);
700 dsl_dataset_tryown(dsl_dataset_t
*ds
, void *tag
)
702 boolean_t gotit
= FALSE
;
704 ASSERT(dsl_pool_config_held(ds
->ds_dir
->dd_pool
));
705 mutex_enter(&ds
->ds_lock
);
706 if (ds
->ds_owner
== NULL
&& !DS_IS_INCONSISTENT(ds
)) {
708 dsl_dataset_long_hold(ds
, tag
);
711 mutex_exit(&ds
->ds_lock
);
716 dsl_dataset_has_owner(dsl_dataset_t
*ds
)
719 mutex_enter(&ds
->ds_lock
);
720 rv
= (ds
->ds_owner
!= NULL
);
721 mutex_exit(&ds
->ds_lock
);
726 dsl_dataset_activate_feature(uint64_t dsobj
, spa_feature_t f
, dmu_tx_t
*tx
)
728 spa_t
*spa
= dmu_tx_pool(tx
)->dp_spa
;
729 objset_t
*mos
= dmu_tx_pool(tx
)->dp_meta_objset
;
732 VERIFY(spa_feature_table
[f
].fi_flags
& ZFEATURE_FLAG_PER_DATASET
);
734 spa_feature_incr(spa
, f
, tx
);
735 dmu_object_zapify(mos
, dsobj
, DMU_OT_DSL_DATASET
, tx
);
737 VERIFY0(zap_add(mos
, dsobj
, spa_feature_table
[f
].fi_guid
,
738 sizeof (zero
), 1, &zero
, tx
));
742 dsl_dataset_deactivate_feature(uint64_t dsobj
, spa_feature_t f
, dmu_tx_t
*tx
)
744 spa_t
*spa
= dmu_tx_pool(tx
)->dp_spa
;
745 objset_t
*mos
= dmu_tx_pool(tx
)->dp_meta_objset
;
747 VERIFY(spa_feature_table
[f
].fi_flags
& ZFEATURE_FLAG_PER_DATASET
);
749 VERIFY0(zap_remove(mos
, dsobj
, spa_feature_table
[f
].fi_guid
, tx
));
750 spa_feature_decr(spa
, f
, tx
);
754 dsl_dataset_create_sync_dd(dsl_dir_t
*dd
, dsl_dataset_t
*origin
,
755 uint64_t flags
, dmu_tx_t
*tx
)
757 dsl_pool_t
*dp
= dd
->dd_pool
;
759 dsl_dataset_phys_t
*dsphys
;
761 objset_t
*mos
= dp
->dp_meta_objset
;
764 origin
= dp
->dp_origin_snap
;
766 ASSERT(origin
== NULL
|| origin
->ds_dir
->dd_pool
== dp
);
767 ASSERT(origin
== NULL
|| dsl_dataset_phys(origin
)->ds_num_children
> 0);
768 ASSERT(dmu_tx_is_syncing(tx
));
769 ASSERT(dsl_dir_phys(dd
)->dd_head_dataset_obj
== 0);
771 dsobj
= dmu_object_alloc(mos
, DMU_OT_DSL_DATASET
, 0,
772 DMU_OT_DSL_DATASET
, sizeof (dsl_dataset_phys_t
), tx
);
773 VERIFY0(dmu_bonus_hold(mos
, dsobj
, FTAG
, &dbuf
));
774 dmu_buf_will_dirty(dbuf
, tx
);
775 dsphys
= dbuf
->db_data
;
776 bzero(dsphys
, sizeof (dsl_dataset_phys_t
));
777 dsphys
->ds_dir_obj
= dd
->dd_object
;
778 dsphys
->ds_flags
= flags
;
779 dsphys
->ds_fsid_guid
= unique_create();
780 (void) random_get_pseudo_bytes((void*)&dsphys
->ds_guid
,
781 sizeof (dsphys
->ds_guid
));
782 dsphys
->ds_snapnames_zapobj
=
783 zap_create_norm(mos
, U8_TEXTPREP_TOUPPER
, DMU_OT_DSL_DS_SNAP_MAP
,
785 dsphys
->ds_creation_time
= gethrestime_sec();
786 dsphys
->ds_creation_txg
= tx
->tx_txg
== TXG_INITIAL
? 1 : tx
->tx_txg
;
788 if (origin
== NULL
) {
789 dsphys
->ds_deadlist_obj
= dsl_deadlist_alloc(mos
, tx
);
791 dsl_dataset_t
*ohds
; /* head of the origin snapshot */
793 dsphys
->ds_prev_snap_obj
= origin
->ds_object
;
794 dsphys
->ds_prev_snap_txg
=
795 dsl_dataset_phys(origin
)->ds_creation_txg
;
796 dsphys
->ds_referenced_bytes
=
797 dsl_dataset_phys(origin
)->ds_referenced_bytes
;
798 dsphys
->ds_compressed_bytes
=
799 dsl_dataset_phys(origin
)->ds_compressed_bytes
;
800 dsphys
->ds_uncompressed_bytes
=
801 dsl_dataset_phys(origin
)->ds_uncompressed_bytes
;
802 dsphys
->ds_bp
= dsl_dataset_phys(origin
)->ds_bp
;
805 * Inherit flags that describe the dataset's contents
806 * (INCONSISTENT) or properties (Case Insensitive).
808 dsphys
->ds_flags
|= dsl_dataset_phys(origin
)->ds_flags
&
809 (DS_FLAG_INCONSISTENT
| DS_FLAG_CI_DATASET
);
811 for (spa_feature_t f
= 0; f
< SPA_FEATURES
; f
++) {
812 if (origin
->ds_feature_inuse
[f
])
813 dsl_dataset_activate_feature(dsobj
, f
, tx
);
816 dmu_buf_will_dirty(origin
->ds_dbuf
, tx
);
817 dsl_dataset_phys(origin
)->ds_num_children
++;
819 VERIFY0(dsl_dataset_hold_obj(dp
,
820 dsl_dir_phys(origin
->ds_dir
)->dd_head_dataset_obj
,
822 dsphys
->ds_deadlist_obj
= dsl_deadlist_clone(&ohds
->ds_deadlist
,
823 dsphys
->ds_prev_snap_txg
, dsphys
->ds_prev_snap_obj
, tx
);
824 dsl_dataset_rele(ohds
, FTAG
);
826 if (spa_version(dp
->dp_spa
) >= SPA_VERSION_NEXT_CLONES
) {
827 if (dsl_dataset_phys(origin
)->ds_next_clones_obj
== 0) {
828 dsl_dataset_phys(origin
)->ds_next_clones_obj
=
830 DMU_OT_NEXT_CLONES
, DMU_OT_NONE
, 0, tx
);
832 VERIFY0(zap_add_int(mos
,
833 dsl_dataset_phys(origin
)->ds_next_clones_obj
,
837 dmu_buf_will_dirty(dd
->dd_dbuf
, tx
);
838 dsl_dir_phys(dd
)->dd_origin_obj
= origin
->ds_object
;
839 if (spa_version(dp
->dp_spa
) >= SPA_VERSION_DIR_CLONES
) {
840 if (dsl_dir_phys(origin
->ds_dir
)->dd_clones
== 0) {
841 dmu_buf_will_dirty(origin
->ds_dir
->dd_dbuf
, tx
);
842 dsl_dir_phys(origin
->ds_dir
)->dd_clones
=
844 DMU_OT_DSL_CLONES
, DMU_OT_NONE
, 0, tx
);
846 VERIFY0(zap_add_int(mos
,
847 dsl_dir_phys(origin
->ds_dir
)->dd_clones
,
852 if (spa_version(dp
->dp_spa
) >= SPA_VERSION_UNIQUE_ACCURATE
)
853 dsphys
->ds_flags
|= DS_FLAG_UNIQUE_ACCURATE
;
855 dmu_buf_rele(dbuf
, FTAG
);
857 dmu_buf_will_dirty(dd
->dd_dbuf
, tx
);
858 dsl_dir_phys(dd
)->dd_head_dataset_obj
= dsobj
;
864 dsl_dataset_zero_zil(dsl_dataset_t
*ds
, dmu_tx_t
*tx
)
868 VERIFY0(dmu_objset_from_ds(ds
, &os
));
869 bzero(&os
->os_zil_header
, sizeof (os
->os_zil_header
));
870 dsl_dataset_dirty(ds
, tx
);
874 dsl_dataset_create_sync(dsl_dir_t
*pdd
, const char *lastname
,
875 dsl_dataset_t
*origin
, uint64_t flags
, cred_t
*cr
, dmu_tx_t
*tx
)
877 dsl_pool_t
*dp
= pdd
->dd_pool
;
878 uint64_t dsobj
, ddobj
;
881 ASSERT(dmu_tx_is_syncing(tx
));
882 ASSERT(lastname
[0] != '@');
884 ddobj
= dsl_dir_create_sync(dp
, pdd
, lastname
, tx
);
885 VERIFY0(dsl_dir_hold_obj(dp
, ddobj
, lastname
, FTAG
, &dd
));
887 dsobj
= dsl_dataset_create_sync_dd(dd
, origin
,
888 flags
& ~DS_CREATE_FLAG_NODIRTY
, tx
);
890 dsl_deleg_set_create_perms(dd
, tx
, cr
);
893 * Since we're creating a new node we know it's a leaf, so we can
894 * initialize the counts if the limit feature is active.
896 if (spa_feature_is_active(dp
->dp_spa
, SPA_FEATURE_FS_SS_LIMIT
)) {
898 objset_t
*os
= dd
->dd_pool
->dp_meta_objset
;
900 dsl_dir_zapify(dd
, tx
);
901 VERIFY0(zap_add(os
, dd
->dd_object
, DD_FIELD_FILESYSTEM_COUNT
,
902 sizeof (cnt
), 1, &cnt
, tx
));
903 VERIFY0(zap_add(os
, dd
->dd_object
, DD_FIELD_SNAPSHOT_COUNT
,
904 sizeof (cnt
), 1, &cnt
, tx
));
907 dsl_dir_rele(dd
, FTAG
);
910 * If we are creating a clone, make sure we zero out any stale
911 * data from the origin snapshots zil header.
913 if (origin
!= NULL
&& !(flags
& DS_CREATE_FLAG_NODIRTY
)) {
916 VERIFY0(dsl_dataset_hold_obj(dp
, dsobj
, FTAG
, &ds
));
917 dsl_dataset_zero_zil(ds
, tx
);
918 dsl_dataset_rele(ds
, FTAG
);
925 * The unique space in the head dataset can be calculated by subtracting
926 * the space used in the most recent snapshot, that is still being used
927 * in this file system, from the space currently in use. To figure out
928 * the space in the most recent snapshot still in use, we need to take
929 * the total space used in the snapshot and subtract out the space that
930 * has been freed up since the snapshot was taken.
933 dsl_dataset_recalc_head_uniq(dsl_dataset_t
*ds
)
936 uint64_t dlused
, dlcomp
, dluncomp
;
938 ASSERT(!ds
->ds_is_snapshot
);
940 if (dsl_dataset_phys(ds
)->ds_prev_snap_obj
!= 0)
941 mrs_used
= dsl_dataset_phys(ds
->ds_prev
)->ds_referenced_bytes
;
945 dsl_deadlist_space(&ds
->ds_deadlist
, &dlused
, &dlcomp
, &dluncomp
);
947 ASSERT3U(dlused
, <=, mrs_used
);
948 dsl_dataset_phys(ds
)->ds_unique_bytes
=
949 dsl_dataset_phys(ds
)->ds_referenced_bytes
- (mrs_used
- dlused
);
951 if (spa_version(ds
->ds_dir
->dd_pool
->dp_spa
) >=
952 SPA_VERSION_UNIQUE_ACCURATE
)
953 dsl_dataset_phys(ds
)->ds_flags
|= DS_FLAG_UNIQUE_ACCURATE
;
957 dsl_dataset_remove_from_next_clones(dsl_dataset_t
*ds
, uint64_t obj
,
960 objset_t
*mos
= ds
->ds_dir
->dd_pool
->dp_meta_objset
;
964 ASSERT(dsl_dataset_phys(ds
)->ds_num_children
>= 2);
965 err
= zap_remove_int(mos
, dsl_dataset_phys(ds
)->ds_next_clones_obj
,
968 * The err should not be ENOENT, but a bug in a previous version
969 * of the code could cause upgrade_clones_cb() to not set
970 * ds_next_snap_obj when it should, leading to a missing entry.
971 * If we knew that the pool was created after
972 * SPA_VERSION_NEXT_CLONES, we could assert that it isn't
973 * ENOENT. However, at least we can check that we don't have
974 * too many entries in the next_clones_obj even after failing to
979 ASSERT0(zap_count(mos
, dsl_dataset_phys(ds
)->ds_next_clones_obj
,
981 ASSERT3U(count
, <=, dsl_dataset_phys(ds
)->ds_num_children
- 2);
986 dsl_dataset_get_blkptr(dsl_dataset_t
*ds
)
988 return (&dsl_dataset_phys(ds
)->ds_bp
);
992 dsl_dataset_set_blkptr(dsl_dataset_t
*ds
, blkptr_t
*bp
, dmu_tx_t
*tx
)
994 ASSERT(dmu_tx_is_syncing(tx
));
995 /* If it's the meta-objset, set dp_meta_rootbp */
997 tx
->tx_pool
->dp_meta_rootbp
= *bp
;
999 dmu_buf_will_dirty(ds
->ds_dbuf
, tx
);
1000 dsl_dataset_phys(ds
)->ds_bp
= *bp
;
1005 dsl_dataset_get_spa(dsl_dataset_t
*ds
)
1007 return (ds
->ds_dir
->dd_pool
->dp_spa
);
1011 dsl_dataset_dirty(dsl_dataset_t
*ds
, dmu_tx_t
*tx
)
1015 if (ds
== NULL
) /* this is the meta-objset */
1018 ASSERT(ds
->ds_objset
!= NULL
);
1020 if (dsl_dataset_phys(ds
)->ds_next_snap_obj
!= 0)
1021 panic("dirtying snapshot!");
1023 dp
= ds
->ds_dir
->dd_pool
;
1025 if (txg_list_add(&dp
->dp_dirty_datasets
, ds
, tx
->tx_txg
)) {
1026 /* up the hold count until we can be written out */
1027 dmu_buf_add_ref(ds
->ds_dbuf
, ds
);
1032 dsl_dataset_is_dirty(dsl_dataset_t
*ds
)
1034 for (int t
= 0; t
< TXG_SIZE
; t
++) {
1035 if (txg_list_member(&ds
->ds_dir
->dd_pool
->dp_dirty_datasets
,
1043 dsl_dataset_snapshot_reserve_space(dsl_dataset_t
*ds
, dmu_tx_t
*tx
)
1047 if (!dmu_tx_is_syncing(tx
))
1051 * If there's an fs-only reservation, any blocks that might become
1052 * owned by the snapshot dataset must be accommodated by space
1053 * outside of the reservation.
1055 ASSERT(ds
->ds_reserved
== 0 || DS_UNIQUE_IS_ACCURATE(ds
));
1056 asize
= MIN(dsl_dataset_phys(ds
)->ds_unique_bytes
, ds
->ds_reserved
);
1057 if (asize
> dsl_dir_space_available(ds
->ds_dir
, NULL
, 0, TRUE
))
1058 return (SET_ERROR(ENOSPC
));
1061 * Propagate any reserved space for this snapshot to other
1062 * snapshot checks in this sync group.
1065 dsl_dir_willuse_space(ds
->ds_dir
, asize
, tx
);
1070 typedef struct dsl_dataset_snapshot_arg
{
1071 nvlist_t
*ddsa_snaps
;
1072 nvlist_t
*ddsa_props
;
1073 nvlist_t
*ddsa_errors
;
1075 } dsl_dataset_snapshot_arg_t
;
1078 dsl_dataset_snapshot_check_impl(dsl_dataset_t
*ds
, const char *snapname
,
1079 dmu_tx_t
*tx
, boolean_t recv
, uint64_t cnt
, cred_t
*cr
)
1084 ds
->ds_trysnap_txg
= tx
->tx_txg
;
1086 if (!dmu_tx_is_syncing(tx
))
1090 * We don't allow multiple snapshots of the same txg. If there
1091 * is already one, try again.
1093 if (dsl_dataset_phys(ds
)->ds_prev_snap_txg
>= tx
->tx_txg
)
1094 return (SET_ERROR(EAGAIN
));
1097 * Check for conflicting snapshot name.
1099 error
= dsl_dataset_snap_lookup(ds
, snapname
, &value
);
1101 return (SET_ERROR(EEXIST
));
1102 if (error
!= ENOENT
)
1106 * We don't allow taking snapshots of inconsistent datasets, such as
1107 * those into which we are currently receiving. However, if we are
1108 * creating this snapshot as part of a receive, this check will be
1109 * executed atomically with respect to the completion of the receive
1110 * itself but prior to the clearing of DS_FLAG_INCONSISTENT; in this
1111 * case we ignore this, knowing it will be fixed up for us shortly in
1112 * dmu_recv_end_sync().
1114 if (!recv
&& DS_IS_INCONSISTENT(ds
))
1115 return (SET_ERROR(EBUSY
));
1118 * Skip the check for temporary snapshots or if we have already checked
1119 * the counts in dsl_dataset_snapshot_check. This means we really only
1120 * check the count here when we're receiving a stream.
1122 if (cnt
!= 0 && cr
!= NULL
) {
1123 error
= dsl_fs_ss_limit_check(ds
->ds_dir
, cnt
,
1124 ZFS_PROP_SNAPSHOT_LIMIT
, NULL
, cr
);
1129 error
= dsl_dataset_snapshot_reserve_space(ds
, tx
);
1137 dsl_dataset_snapshot_check(void *arg
, dmu_tx_t
*tx
)
1139 dsl_dataset_snapshot_arg_t
*ddsa
= arg
;
1140 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
1145 * Pre-compute how many total new snapshots will be created for each
1146 * level in the tree and below. This is needed for validating the
1147 * snapshot limit when either taking a recursive snapshot or when
1148 * taking multiple snapshots.
1150 * The problem is that the counts are not actually adjusted when
1151 * we are checking, only when we finally sync. For a single snapshot,
1152 * this is easy, the count will increase by 1 at each node up the tree,
1153 * but its more complicated for the recursive/multiple snapshot case.
1155 * The dsl_fs_ss_limit_check function does recursively check the count
1156 * at each level up the tree but since it is validating each snapshot
1157 * independently we need to be sure that we are validating the complete
1158 * count for the entire set of snapshots. We do this by rolling up the
1159 * counts for each component of the name into an nvlist and then
1160 * checking each of those cases with the aggregated count.
1162 * This approach properly handles not only the recursive snapshot
1163 * case (where we get all of those on the ddsa_snaps list) but also
1164 * the sibling case (e.g. snapshot a/b and a/c so that we will also
1165 * validate the limit on 'a' using a count of 2).
1167 * We validate the snapshot names in the third loop and only report
1170 if (dmu_tx_is_syncing(tx
)) {
1171 nvlist_t
*cnt_track
= NULL
;
1172 cnt_track
= fnvlist_alloc();
1174 /* Rollup aggregated counts into the cnt_track list */
1175 for (pair
= nvlist_next_nvpair(ddsa
->ddsa_snaps
, NULL
);
1177 pair
= nvlist_next_nvpair(ddsa
->ddsa_snaps
, pair
)) {
1180 char nm
[MAXPATHLEN
];
1182 (void) strlcpy(nm
, nvpair_name(pair
), sizeof (nm
));
1183 pdelim
= strchr(nm
, '@');
1189 if (nvlist_lookup_uint64(cnt_track
, nm
,
1191 /* update existing entry */
1192 fnvlist_add_uint64(cnt_track
, nm
,
1196 fnvlist_add_uint64(cnt_track
, nm
, 1);
1199 pdelim
= strrchr(nm
, '/');
1202 } while (pdelim
!= NULL
);
1205 /* Check aggregated counts at each level */
1206 for (pair
= nvlist_next_nvpair(cnt_track
, NULL
);
1207 pair
!= NULL
; pair
= nvlist_next_nvpair(cnt_track
, pair
)) {
1213 name
= nvpair_name(pair
);
1214 cnt
= fnvpair_value_uint64(pair
);
1217 error
= dsl_dataset_hold(dp
, name
, FTAG
, &ds
);
1219 error
= dsl_fs_ss_limit_check(ds
->ds_dir
, cnt
,
1220 ZFS_PROP_SNAPSHOT_LIMIT
, NULL
,
1222 dsl_dataset_rele(ds
, FTAG
);
1226 if (ddsa
->ddsa_errors
!= NULL
)
1227 fnvlist_add_int32(ddsa
->ddsa_errors
,
1230 /* only report one error for this check */
1234 nvlist_free(cnt_track
);
1237 for (pair
= nvlist_next_nvpair(ddsa
->ddsa_snaps
, NULL
);
1238 pair
!= NULL
; pair
= nvlist_next_nvpair(ddsa
->ddsa_snaps
, pair
)) {
1242 char dsname
[MAXNAMELEN
];
1244 name
= nvpair_name(pair
);
1245 if (strlen(name
) >= MAXNAMELEN
)
1246 error
= SET_ERROR(ENAMETOOLONG
);
1248 atp
= strchr(name
, '@');
1250 error
= SET_ERROR(EINVAL
);
1252 (void) strlcpy(dsname
, name
, atp
- name
+ 1);
1255 error
= dsl_dataset_hold(dp
, dsname
, FTAG
, &ds
);
1257 /* passing 0/NULL skips dsl_fs_ss_limit_check */
1258 error
= dsl_dataset_snapshot_check_impl(ds
,
1259 atp
+ 1, tx
, B_FALSE
, 0, NULL
);
1260 dsl_dataset_rele(ds
, FTAG
);
1264 if (ddsa
->ddsa_errors
!= NULL
) {
1265 fnvlist_add_int32(ddsa
->ddsa_errors
,
1276 dsl_dataset_snapshot_sync_impl(dsl_dataset_t
*ds
, const char *snapname
,
1279 static zil_header_t zero_zil
;
1281 dsl_pool_t
*dp
= ds
->ds_dir
->dd_pool
;
1283 dsl_dataset_phys_t
*dsphys
;
1284 uint64_t dsobj
, crtxg
;
1285 objset_t
*mos
= dp
->dp_meta_objset
;
1288 ASSERT(RRW_WRITE_HELD(&dp
->dp_config_rwlock
));
1291 * If we are on an old pool, the zil must not be active, in which
1292 * case it will be zeroed. Usually zil_suspend() accomplishes this.
1294 ASSERT(spa_version(dmu_tx_pool(tx
)->dp_spa
) >= SPA_VERSION_FAST_SNAP
||
1295 dmu_objset_from_ds(ds
, &os
) != 0 ||
1296 bcmp(&os
->os_phys
->os_zil_header
, &zero_zil
,
1297 sizeof (zero_zil
)) == 0);
1299 dsl_fs_ss_count_adjust(ds
->ds_dir
, 1, DD_FIELD_SNAPSHOT_COUNT
, tx
);
1302 * The origin's ds_creation_txg has to be < TXG_INITIAL
1304 if (strcmp(snapname
, ORIGIN_DIR_NAME
) == 0)
1309 dsobj
= dmu_object_alloc(mos
, DMU_OT_DSL_DATASET
, 0,
1310 DMU_OT_DSL_DATASET
, sizeof (dsl_dataset_phys_t
), tx
);
1311 VERIFY0(dmu_bonus_hold(mos
, dsobj
, FTAG
, &dbuf
));
1312 dmu_buf_will_dirty(dbuf
, tx
);
1313 dsphys
= dbuf
->db_data
;
1314 bzero(dsphys
, sizeof (dsl_dataset_phys_t
));
1315 dsphys
->ds_dir_obj
= ds
->ds_dir
->dd_object
;
1316 dsphys
->ds_fsid_guid
= unique_create();
1317 (void) random_get_pseudo_bytes((void*)&dsphys
->ds_guid
,
1318 sizeof (dsphys
->ds_guid
));
1319 dsphys
->ds_prev_snap_obj
= dsl_dataset_phys(ds
)->ds_prev_snap_obj
;
1320 dsphys
->ds_prev_snap_txg
= dsl_dataset_phys(ds
)->ds_prev_snap_txg
;
1321 dsphys
->ds_next_snap_obj
= ds
->ds_object
;
1322 dsphys
->ds_num_children
= 1;
1323 dsphys
->ds_creation_time
= gethrestime_sec();
1324 dsphys
->ds_creation_txg
= crtxg
;
1325 dsphys
->ds_deadlist_obj
= dsl_dataset_phys(ds
)->ds_deadlist_obj
;
1326 dsphys
->ds_referenced_bytes
= dsl_dataset_phys(ds
)->ds_referenced_bytes
;
1327 dsphys
->ds_compressed_bytes
= dsl_dataset_phys(ds
)->ds_compressed_bytes
;
1328 dsphys
->ds_uncompressed_bytes
=
1329 dsl_dataset_phys(ds
)->ds_uncompressed_bytes
;
1330 dsphys
->ds_flags
= dsl_dataset_phys(ds
)->ds_flags
;
1331 dsphys
->ds_bp
= dsl_dataset_phys(ds
)->ds_bp
;
1332 dmu_buf_rele(dbuf
, FTAG
);
1334 for (spa_feature_t f
= 0; f
< SPA_FEATURES
; f
++) {
1335 if (ds
->ds_feature_inuse
[f
])
1336 dsl_dataset_activate_feature(dsobj
, f
, tx
);
1339 ASSERT3U(ds
->ds_prev
!= 0, ==,
1340 dsl_dataset_phys(ds
)->ds_prev_snap_obj
!= 0);
1342 uint64_t next_clones_obj
=
1343 dsl_dataset_phys(ds
->ds_prev
)->ds_next_clones_obj
;
1344 ASSERT(dsl_dataset_phys(ds
->ds_prev
)->ds_next_snap_obj
==
1346 dsl_dataset_phys(ds
->ds_prev
)->ds_num_children
> 1);
1347 if (dsl_dataset_phys(ds
->ds_prev
)->ds_next_snap_obj
==
1349 dmu_buf_will_dirty(ds
->ds_prev
->ds_dbuf
, tx
);
1350 ASSERT3U(dsl_dataset_phys(ds
)->ds_prev_snap_txg
, ==,
1351 dsl_dataset_phys(ds
->ds_prev
)->ds_creation_txg
);
1352 dsl_dataset_phys(ds
->ds_prev
)->ds_next_snap_obj
= dsobj
;
1353 } else if (next_clones_obj
!= 0) {
1354 dsl_dataset_remove_from_next_clones(ds
->ds_prev
,
1355 dsphys
->ds_next_snap_obj
, tx
);
1356 VERIFY0(zap_add_int(mos
,
1357 next_clones_obj
, dsobj
, tx
));
1362 * If we have a reference-reservation on this dataset, we will
1363 * need to increase the amount of refreservation being charged
1364 * since our unique space is going to zero.
1366 if (ds
->ds_reserved
) {
1368 ASSERT(DS_UNIQUE_IS_ACCURATE(ds
));
1369 delta
= MIN(dsl_dataset_phys(ds
)->ds_unique_bytes
,
1371 dsl_dir_diduse_space(ds
->ds_dir
, DD_USED_REFRSRV
,
1375 dmu_buf_will_dirty(ds
->ds_dbuf
, tx
);
1376 dsl_dataset_phys(ds
)->ds_deadlist_obj
=
1377 dsl_deadlist_clone(&ds
->ds_deadlist
, UINT64_MAX
,
1378 dsl_dataset_phys(ds
)->ds_prev_snap_obj
, tx
);
1379 dsl_deadlist_close(&ds
->ds_deadlist
);
1380 dsl_deadlist_open(&ds
->ds_deadlist
, mos
,
1381 dsl_dataset_phys(ds
)->ds_deadlist_obj
);
1382 dsl_deadlist_add_key(&ds
->ds_deadlist
,
1383 dsl_dataset_phys(ds
)->ds_prev_snap_txg
, tx
);
1385 ASSERT3U(dsl_dataset_phys(ds
)->ds_prev_snap_txg
, <, tx
->tx_txg
);
1386 dsl_dataset_phys(ds
)->ds_prev_snap_obj
= dsobj
;
1387 dsl_dataset_phys(ds
)->ds_prev_snap_txg
= crtxg
;
1388 dsl_dataset_phys(ds
)->ds_unique_bytes
= 0;
1389 if (spa_version(dp
->dp_spa
) >= SPA_VERSION_UNIQUE_ACCURATE
)
1390 dsl_dataset_phys(ds
)->ds_flags
|= DS_FLAG_UNIQUE_ACCURATE
;
1392 VERIFY0(zap_add(mos
, dsl_dataset_phys(ds
)->ds_snapnames_zapobj
,
1393 snapname
, 8, 1, &dsobj
, tx
));
1396 dsl_dataset_rele(ds
->ds_prev
, ds
);
1397 VERIFY0(dsl_dataset_hold_obj(dp
,
1398 dsl_dataset_phys(ds
)->ds_prev_snap_obj
, ds
, &ds
->ds_prev
));
1400 dsl_scan_ds_snapshotted(ds
, tx
);
1402 dsl_dir_snap_cmtime_update(ds
->ds_dir
);
1404 spa_history_log_internal_ds(ds
->ds_prev
, "snapshot", tx
, "");
1408 dsl_dataset_snapshot_sync(void *arg
, dmu_tx_t
*tx
)
1410 dsl_dataset_snapshot_arg_t
*ddsa
= arg
;
1411 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
1414 for (pair
= nvlist_next_nvpair(ddsa
->ddsa_snaps
, NULL
);
1415 pair
!= NULL
; pair
= nvlist_next_nvpair(ddsa
->ddsa_snaps
, pair
)) {
1418 char dsname
[MAXNAMELEN
];
1420 name
= nvpair_name(pair
);
1421 atp
= strchr(name
, '@');
1422 (void) strlcpy(dsname
, name
, atp
- name
+ 1);
1423 VERIFY0(dsl_dataset_hold(dp
, dsname
, FTAG
, &ds
));
1425 dsl_dataset_snapshot_sync_impl(ds
, atp
+ 1, tx
);
1426 if (ddsa
->ddsa_props
!= NULL
) {
1427 dsl_props_set_sync_impl(ds
->ds_prev
,
1428 ZPROP_SRC_LOCAL
, ddsa
->ddsa_props
, tx
);
1430 dsl_dataset_rele(ds
, FTAG
);
1435 * The snapshots must all be in the same pool.
1436 * All-or-nothing: if there are any failures, nothing will be modified.
1439 dsl_dataset_snapshot(nvlist_t
*snaps
, nvlist_t
*props
, nvlist_t
*errors
)
1441 dsl_dataset_snapshot_arg_t ddsa
;
1443 boolean_t needsuspend
;
1447 nvlist_t
*suspended
= NULL
;
1449 pair
= nvlist_next_nvpair(snaps
, NULL
);
1452 firstname
= nvpair_name(pair
);
1454 error
= spa_open(firstname
, &spa
, FTAG
);
1457 needsuspend
= (spa_version(spa
) < SPA_VERSION_FAST_SNAP
);
1458 spa_close(spa
, FTAG
);
1461 suspended
= fnvlist_alloc();
1462 for (pair
= nvlist_next_nvpair(snaps
, NULL
); pair
!= NULL
;
1463 pair
= nvlist_next_nvpair(snaps
, pair
)) {
1464 char fsname
[MAXNAMELEN
];
1465 char *snapname
= nvpair_name(pair
);
1469 atp
= strchr(snapname
, '@');
1471 error
= SET_ERROR(EINVAL
);
1474 (void) strlcpy(fsname
, snapname
, atp
- snapname
+ 1);
1476 error
= zil_suspend(fsname
, &cookie
);
1479 fnvlist_add_uint64(suspended
, fsname
,
1484 ddsa
.ddsa_snaps
= snaps
;
1485 ddsa
.ddsa_props
= props
;
1486 ddsa
.ddsa_errors
= errors
;
1487 ddsa
.ddsa_cr
= CRED();
1490 error
= dsl_sync_task(firstname
, dsl_dataset_snapshot_check
,
1491 dsl_dataset_snapshot_sync
, &ddsa
,
1492 fnvlist_num_pairs(snaps
) * 3, ZFS_SPACE_CHECK_NORMAL
);
1495 if (suspended
!= NULL
) {
1496 for (pair
= nvlist_next_nvpair(suspended
, NULL
); pair
!= NULL
;
1497 pair
= nvlist_next_nvpair(suspended
, pair
)) {
1498 zil_resume((void *)(uintptr_t)
1499 fnvpair_value_uint64(pair
));
1501 fnvlist_free(suspended
);
1507 typedef struct dsl_dataset_snapshot_tmp_arg
{
1508 const char *ddsta_fsname
;
1509 const char *ddsta_snapname
;
1510 minor_t ddsta_cleanup_minor
;
1511 const char *ddsta_htag
;
1512 } dsl_dataset_snapshot_tmp_arg_t
;
1515 dsl_dataset_snapshot_tmp_check(void *arg
, dmu_tx_t
*tx
)
1517 dsl_dataset_snapshot_tmp_arg_t
*ddsta
= arg
;
1518 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
1522 error
= dsl_dataset_hold(dp
, ddsta
->ddsta_fsname
, FTAG
, &ds
);
1526 /* NULL cred means no limit check for tmp snapshot */
1527 error
= dsl_dataset_snapshot_check_impl(ds
, ddsta
->ddsta_snapname
,
1528 tx
, B_FALSE
, 0, NULL
);
1530 dsl_dataset_rele(ds
, FTAG
);
1534 if (spa_version(dp
->dp_spa
) < SPA_VERSION_USERREFS
) {
1535 dsl_dataset_rele(ds
, FTAG
);
1536 return (SET_ERROR(ENOTSUP
));
1538 error
= dsl_dataset_user_hold_check_one(NULL
, ddsta
->ddsta_htag
,
1541 dsl_dataset_rele(ds
, FTAG
);
1545 dsl_dataset_rele(ds
, FTAG
);
1550 dsl_dataset_snapshot_tmp_sync(void *arg
, dmu_tx_t
*tx
)
1552 dsl_dataset_snapshot_tmp_arg_t
*ddsta
= arg
;
1553 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
1556 VERIFY0(dsl_dataset_hold(dp
, ddsta
->ddsta_fsname
, FTAG
, &ds
));
1558 dsl_dataset_snapshot_sync_impl(ds
, ddsta
->ddsta_snapname
, tx
);
1559 dsl_dataset_user_hold_sync_one(ds
->ds_prev
, ddsta
->ddsta_htag
,
1560 ddsta
->ddsta_cleanup_minor
, gethrestime_sec(), tx
);
1561 dsl_destroy_snapshot_sync_impl(ds
->ds_prev
, B_TRUE
, tx
);
1563 dsl_dataset_rele(ds
, FTAG
);
1567 dsl_dataset_snapshot_tmp(const char *fsname
, const char *snapname
,
1568 minor_t cleanup_minor
, const char *htag
)
1570 dsl_dataset_snapshot_tmp_arg_t ddsta
;
1573 boolean_t needsuspend
;
1576 ddsta
.ddsta_fsname
= fsname
;
1577 ddsta
.ddsta_snapname
= snapname
;
1578 ddsta
.ddsta_cleanup_minor
= cleanup_minor
;
1579 ddsta
.ddsta_htag
= htag
;
1581 error
= spa_open(fsname
, &spa
, FTAG
);
1584 needsuspend
= (spa_version(spa
) < SPA_VERSION_FAST_SNAP
);
1585 spa_close(spa
, FTAG
);
1588 error
= zil_suspend(fsname
, &cookie
);
1593 error
= dsl_sync_task(fsname
, dsl_dataset_snapshot_tmp_check
,
1594 dsl_dataset_snapshot_tmp_sync
, &ddsta
, 3, ZFS_SPACE_CHECK_RESERVED
);
1603 dsl_dataset_sync(dsl_dataset_t
*ds
, zio_t
*zio
, dmu_tx_t
*tx
)
1605 ASSERT(dmu_tx_is_syncing(tx
));
1606 ASSERT(ds
->ds_objset
!= NULL
);
1607 ASSERT(dsl_dataset_phys(ds
)->ds_next_snap_obj
== 0);
1610 * in case we had to change ds_fsid_guid when we opened it,
1613 dmu_buf_will_dirty(ds
->ds_dbuf
, tx
);
1614 dsl_dataset_phys(ds
)->ds_fsid_guid
= ds
->ds_fsid_guid
;
1616 if (ds
->ds_resume_bytes
[tx
->tx_txg
& TXG_MASK
] != 0) {
1617 VERIFY0(zap_update(tx
->tx_pool
->dp_meta_objset
,
1618 ds
->ds_object
, DS_FIELD_RESUME_OBJECT
, 8, 1,
1619 &ds
->ds_resume_object
[tx
->tx_txg
& TXG_MASK
], tx
));
1620 VERIFY0(zap_update(tx
->tx_pool
->dp_meta_objset
,
1621 ds
->ds_object
, DS_FIELD_RESUME_OFFSET
, 8, 1,
1622 &ds
->ds_resume_offset
[tx
->tx_txg
& TXG_MASK
], tx
));
1623 VERIFY0(zap_update(tx
->tx_pool
->dp_meta_objset
,
1624 ds
->ds_object
, DS_FIELD_RESUME_BYTES
, 8, 1,
1625 &ds
->ds_resume_bytes
[tx
->tx_txg
& TXG_MASK
], tx
));
1626 ds
->ds_resume_object
[tx
->tx_txg
& TXG_MASK
] = 0;
1627 ds
->ds_resume_offset
[tx
->tx_txg
& TXG_MASK
] = 0;
1628 ds
->ds_resume_bytes
[tx
->tx_txg
& TXG_MASK
] = 0;
1631 dmu_objset_sync(ds
->ds_objset
, zio
, tx
);
1633 for (spa_feature_t f
= 0; f
< SPA_FEATURES
; f
++) {
1634 if (ds
->ds_feature_activation_needed
[f
]) {
1635 if (ds
->ds_feature_inuse
[f
])
1637 dsl_dataset_activate_feature(ds
->ds_object
, f
, tx
);
1638 ds
->ds_feature_inuse
[f
] = B_TRUE
;
1644 get_clones_stat(dsl_dataset_t
*ds
, nvlist_t
*nv
)
1647 objset_t
*mos
= ds
->ds_dir
->dd_pool
->dp_meta_objset
;
1650 nvlist_t
*propval
= fnvlist_alloc();
1651 nvlist_t
*val
= fnvlist_alloc();
1653 ASSERT(dsl_pool_config_held(ds
->ds_dir
->dd_pool
));
1656 * There may be missing entries in ds_next_clones_obj
1657 * due to a bug in a previous version of the code.
1658 * Only trust it if it has the right number of entries.
1660 if (dsl_dataset_phys(ds
)->ds_next_clones_obj
!= 0) {
1661 VERIFY0(zap_count(mos
, dsl_dataset_phys(ds
)->ds_next_clones_obj
,
1664 if (count
!= dsl_dataset_phys(ds
)->ds_num_children
- 1)
1666 for (zap_cursor_init(&zc
, mos
,
1667 dsl_dataset_phys(ds
)->ds_next_clones_obj
);
1668 zap_cursor_retrieve(&zc
, &za
) == 0;
1669 zap_cursor_advance(&zc
)) {
1670 dsl_dataset_t
*clone
;
1671 char buf
[ZFS_MAXNAMELEN
];
1672 VERIFY0(dsl_dataset_hold_obj(ds
->ds_dir
->dd_pool
,
1673 za
.za_first_integer
, FTAG
, &clone
));
1674 dsl_dir_name(clone
->ds_dir
, buf
);
1675 fnvlist_add_boolean(val
, buf
);
1676 dsl_dataset_rele(clone
, FTAG
);
1678 zap_cursor_fini(&zc
);
1679 fnvlist_add_nvlist(propval
, ZPROP_VALUE
, val
);
1680 fnvlist_add_nvlist(nv
, zfs_prop_to_name(ZFS_PROP_CLONES
), propval
);
1683 nvlist_free(propval
);
1687 get_receive_resume_stats(dsl_dataset_t
*ds
, nvlist_t
*nv
)
1689 dsl_pool_t
*dp
= ds
->ds_dir
->dd_pool
;
1691 if (dsl_dataset_has_resume_receive_state(ds
)) {
1694 uint8_t *compressed
;
1696 nvlist_t
*token_nv
= fnvlist_alloc();
1697 size_t packed_size
, compressed_size
;
1699 if (zap_lookup(dp
->dp_meta_objset
, ds
->ds_object
,
1700 DS_FIELD_RESUME_FROMGUID
, sizeof (val
), 1, &val
) == 0) {
1701 fnvlist_add_uint64(token_nv
, "fromguid", val
);
1703 if (zap_lookup(dp
->dp_meta_objset
, ds
->ds_object
,
1704 DS_FIELD_RESUME_OBJECT
, sizeof (val
), 1, &val
) == 0) {
1705 fnvlist_add_uint64(token_nv
, "object", val
);
1707 if (zap_lookup(dp
->dp_meta_objset
, ds
->ds_object
,
1708 DS_FIELD_RESUME_OFFSET
, sizeof (val
), 1, &val
) == 0) {
1709 fnvlist_add_uint64(token_nv
, "offset", val
);
1711 if (zap_lookup(dp
->dp_meta_objset
, ds
->ds_object
,
1712 DS_FIELD_RESUME_BYTES
, sizeof (val
), 1, &val
) == 0) {
1713 fnvlist_add_uint64(token_nv
, "bytes", val
);
1715 if (zap_lookup(dp
->dp_meta_objset
, ds
->ds_object
,
1716 DS_FIELD_RESUME_TOGUID
, sizeof (val
), 1, &val
) == 0) {
1717 fnvlist_add_uint64(token_nv
, "toguid", val
);
1720 if (zap_lookup(dp
->dp_meta_objset
, ds
->ds_object
,
1721 DS_FIELD_RESUME_TONAME
, 1, sizeof (buf
), buf
) == 0) {
1722 fnvlist_add_string(token_nv
, "toname", buf
);
1724 if (zap_contains(dp
->dp_meta_objset
, ds
->ds_object
,
1725 DS_FIELD_RESUME_EMBEDOK
) == 0) {
1726 fnvlist_add_boolean(token_nv
, "embedok");
1728 packed
= fnvlist_pack(token_nv
, &packed_size
);
1729 fnvlist_free(token_nv
);
1730 compressed
= kmem_alloc(packed_size
, KM_SLEEP
);
1732 compressed_size
= gzip_compress(packed
, compressed
,
1733 packed_size
, packed_size
, 6);
1736 fletcher_4_native(compressed
, compressed_size
, NULL
, &cksum
);
1738 str
= kmem_alloc(compressed_size
* 2 + 1, KM_SLEEP
);
1739 for (int i
= 0; i
< compressed_size
; i
++) {
1740 (void) sprintf(str
+ i
* 2, "%02x", compressed
[i
]);
1742 str
[compressed_size
* 2] = '\0';
1743 char *propval
= kmem_asprintf("%u-%llx-%llx-%s",
1744 ZFS_SEND_RESUME_TOKEN_VERSION
,
1745 (longlong_t
)cksum
.zc_word
[0],
1746 (longlong_t
)packed_size
, str
);
1747 dsl_prop_nvlist_add_string(nv
,
1748 ZFS_PROP_RECEIVE_RESUME_TOKEN
, propval
);
1749 kmem_free(packed
, packed_size
);
1750 kmem_free(str
, compressed_size
* 2 + 1);
1751 kmem_free(compressed
, packed_size
);
1757 dsl_dataset_stats(dsl_dataset_t
*ds
, nvlist_t
*nv
)
1759 dsl_pool_t
*dp
= ds
->ds_dir
->dd_pool
;
1760 uint64_t refd
, avail
, uobjs
, aobjs
, ratio
;
1762 ASSERT(dsl_pool_config_held(dp
));
1764 ratio
= dsl_dataset_phys(ds
)->ds_compressed_bytes
== 0 ? 100 :
1765 (dsl_dataset_phys(ds
)->ds_uncompressed_bytes
* 100 /
1766 dsl_dataset_phys(ds
)->ds_compressed_bytes
);
1768 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_REFRATIO
, ratio
);
1769 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_LOGICALREFERENCED
,
1770 dsl_dataset_phys(ds
)->ds_uncompressed_bytes
);
1772 if (ds
->ds_is_snapshot
) {
1773 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_COMPRESSRATIO
, ratio
);
1774 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_USED
,
1775 dsl_dataset_phys(ds
)->ds_unique_bytes
);
1776 get_clones_stat(ds
, nv
);
1778 if (ds
->ds_prev
!= NULL
&& ds
->ds_prev
!= dp
->dp_origin_snap
) {
1779 char buf
[MAXNAMELEN
];
1780 dsl_dataset_name(ds
->ds_prev
, buf
);
1781 dsl_prop_nvlist_add_string(nv
, ZFS_PROP_PREV_SNAP
, buf
);
1784 dsl_dir_stats(ds
->ds_dir
, nv
);
1787 dsl_dataset_space(ds
, &refd
, &avail
, &uobjs
, &aobjs
);
1788 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_AVAILABLE
, avail
);
1789 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_REFERENCED
, refd
);
1791 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_CREATION
,
1792 dsl_dataset_phys(ds
)->ds_creation_time
);
1793 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_CREATETXG
,
1794 dsl_dataset_phys(ds
)->ds_creation_txg
);
1795 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_REFQUOTA
,
1797 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_REFRESERVATION
,
1799 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_GUID
,
1800 dsl_dataset_phys(ds
)->ds_guid
);
1801 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_UNIQUE
,
1802 dsl_dataset_phys(ds
)->ds_unique_bytes
);
1803 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_OBJSETID
,
1805 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_USERREFS
,
1807 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_DEFER_DESTROY
,
1808 DS_IS_DEFER_DESTROY(ds
) ? 1 : 0);
1810 if (dsl_dataset_phys(ds
)->ds_prev_snap_obj
!= 0) {
1811 uint64_t written
, comp
, uncomp
;
1812 dsl_pool_t
*dp
= ds
->ds_dir
->dd_pool
;
1813 dsl_dataset_t
*prev
;
1815 int err
= dsl_dataset_hold_obj(dp
,
1816 dsl_dataset_phys(ds
)->ds_prev_snap_obj
, FTAG
, &prev
);
1818 err
= dsl_dataset_space_written(prev
, ds
, &written
,
1820 dsl_dataset_rele(prev
, FTAG
);
1822 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_WRITTEN
,
1828 if (!dsl_dataset_is_snapshot(ds
)) {
1830 * A failed "newfs" (e.g. full) resumable receive leaves
1831 * the stats set on this dataset. Check here for the prop.
1833 get_receive_resume_stats(ds
, nv
);
1836 * A failed incremental resumable receive leaves the
1837 * stats set on our child named "%recv". Check the child
1840 char recvname
[ZFS_MAXNAMELEN
];
1841 dsl_dataset_t
*recv_ds
;
1842 dsl_dataset_name(ds
, recvname
);
1843 (void) strcat(recvname
, "/");
1844 (void) strcat(recvname
, recv_clone_name
);
1845 if (dsl_dataset_hold(dp
, recvname
, FTAG
, &recv_ds
) == 0) {
1846 get_receive_resume_stats(recv_ds
, nv
);
1847 dsl_dataset_rele(recv_ds
, FTAG
);
1853 dsl_dataset_fast_stat(dsl_dataset_t
*ds
, dmu_objset_stats_t
*stat
)
1855 dsl_pool_t
*dp
= ds
->ds_dir
->dd_pool
;
1856 ASSERT(dsl_pool_config_held(dp
));
1858 stat
->dds_creation_txg
= dsl_dataset_phys(ds
)->ds_creation_txg
;
1859 stat
->dds_inconsistent
=
1860 dsl_dataset_phys(ds
)->ds_flags
& DS_FLAG_INCONSISTENT
;
1861 stat
->dds_guid
= dsl_dataset_phys(ds
)->ds_guid
;
1862 stat
->dds_origin
[0] = '\0';
1863 if (ds
->ds_is_snapshot
) {
1864 stat
->dds_is_snapshot
= B_TRUE
;
1865 stat
->dds_num_clones
=
1866 dsl_dataset_phys(ds
)->ds_num_children
- 1;
1868 stat
->dds_is_snapshot
= B_FALSE
;
1869 stat
->dds_num_clones
= 0;
1871 if (dsl_dir_is_clone(ds
->ds_dir
)) {
1874 VERIFY0(dsl_dataset_hold_obj(dp
,
1875 dsl_dir_phys(ds
->ds_dir
)->dd_origin_obj
,
1877 dsl_dataset_name(ods
, stat
->dds_origin
);
1878 dsl_dataset_rele(ods
, FTAG
);
1884 dsl_dataset_fsid_guid(dsl_dataset_t
*ds
)
1886 return (ds
->ds_fsid_guid
);
1890 dsl_dataset_space(dsl_dataset_t
*ds
,
1891 uint64_t *refdbytesp
, uint64_t *availbytesp
,
1892 uint64_t *usedobjsp
, uint64_t *availobjsp
)
1894 *refdbytesp
= dsl_dataset_phys(ds
)->ds_referenced_bytes
;
1895 *availbytesp
= dsl_dir_space_available(ds
->ds_dir
, NULL
, 0, TRUE
);
1896 if (ds
->ds_reserved
> dsl_dataset_phys(ds
)->ds_unique_bytes
)
1898 ds
->ds_reserved
- dsl_dataset_phys(ds
)->ds_unique_bytes
;
1899 if (ds
->ds_quota
!= 0) {
1901 * Adjust available bytes according to refquota
1903 if (*refdbytesp
< ds
->ds_quota
)
1904 *availbytesp
= MIN(*availbytesp
,
1905 ds
->ds_quota
- *refdbytesp
);
1909 *usedobjsp
= BP_GET_FILL(&dsl_dataset_phys(ds
)->ds_bp
);
1910 *availobjsp
= DN_MAX_OBJECT
- *usedobjsp
;
1914 dsl_dataset_modified_since_snap(dsl_dataset_t
*ds
, dsl_dataset_t
*snap
)
1916 dsl_pool_t
*dp
= ds
->ds_dir
->dd_pool
;
1918 ASSERT(dsl_pool_config_held(dp
));
1921 if (dsl_dataset_phys(ds
)->ds_bp
.blk_birth
>
1922 dsl_dataset_phys(snap
)->ds_creation_txg
) {
1923 objset_t
*os
, *os_snap
;
1925 * It may be that only the ZIL differs, because it was
1926 * reset in the head. Don't count that as being
1929 if (dmu_objset_from_ds(ds
, &os
) != 0)
1931 if (dmu_objset_from_ds(snap
, &os_snap
) != 0)
1933 return (bcmp(&os
->os_phys
->os_meta_dnode
,
1934 &os_snap
->os_phys
->os_meta_dnode
,
1935 sizeof (os
->os_phys
->os_meta_dnode
)) != 0);
1940 typedef struct dsl_dataset_rename_snapshot_arg
{
1941 const char *ddrsa_fsname
;
1942 const char *ddrsa_oldsnapname
;
1943 const char *ddrsa_newsnapname
;
1944 boolean_t ddrsa_recursive
;
1946 } dsl_dataset_rename_snapshot_arg_t
;
1950 dsl_dataset_rename_snapshot_check_impl(dsl_pool_t
*dp
,
1951 dsl_dataset_t
*hds
, void *arg
)
1953 dsl_dataset_rename_snapshot_arg_t
*ddrsa
= arg
;
1957 error
= dsl_dataset_snap_lookup(hds
, ddrsa
->ddrsa_oldsnapname
, &val
);
1959 /* ignore nonexistent snapshots */
1960 return (error
== ENOENT
? 0 : error
);
1963 /* new name should not exist */
1964 error
= dsl_dataset_snap_lookup(hds
, ddrsa
->ddrsa_newsnapname
, &val
);
1966 error
= SET_ERROR(EEXIST
);
1967 else if (error
== ENOENT
)
1970 /* dataset name + 1 for the "@" + the new snapshot name must fit */
1971 if (dsl_dir_namelen(hds
->ds_dir
) + 1 +
1972 strlen(ddrsa
->ddrsa_newsnapname
) >= MAXNAMELEN
)
1973 error
= SET_ERROR(ENAMETOOLONG
);
1979 dsl_dataset_rename_snapshot_check(void *arg
, dmu_tx_t
*tx
)
1981 dsl_dataset_rename_snapshot_arg_t
*ddrsa
= arg
;
1982 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
1986 error
= dsl_dataset_hold(dp
, ddrsa
->ddrsa_fsname
, FTAG
, &hds
);
1990 if (ddrsa
->ddrsa_recursive
) {
1991 error
= dmu_objset_find_dp(dp
, hds
->ds_dir
->dd_object
,
1992 dsl_dataset_rename_snapshot_check_impl
, ddrsa
,
1995 error
= dsl_dataset_rename_snapshot_check_impl(dp
, hds
, ddrsa
);
1997 dsl_dataset_rele(hds
, FTAG
);
2002 dsl_dataset_rename_snapshot_sync_impl(dsl_pool_t
*dp
,
2003 dsl_dataset_t
*hds
, void *arg
)
2005 dsl_dataset_rename_snapshot_arg_t
*ddrsa
= arg
;
2008 dmu_tx_t
*tx
= ddrsa
->ddrsa_tx
;
2011 error
= dsl_dataset_snap_lookup(hds
, ddrsa
->ddrsa_oldsnapname
, &val
);
2012 ASSERT(error
== 0 || error
== ENOENT
);
2013 if (error
== ENOENT
) {
2014 /* ignore nonexistent snapshots */
2018 VERIFY0(dsl_dataset_hold_obj(dp
, val
, FTAG
, &ds
));
2020 /* log before we change the name */
2021 spa_history_log_internal_ds(ds
, "rename", tx
,
2022 "-> @%s", ddrsa
->ddrsa_newsnapname
);
2024 VERIFY0(dsl_dataset_snap_remove(hds
, ddrsa
->ddrsa_oldsnapname
, tx
,
2026 mutex_enter(&ds
->ds_lock
);
2027 (void) strcpy(ds
->ds_snapname
, ddrsa
->ddrsa_newsnapname
);
2028 mutex_exit(&ds
->ds_lock
);
2029 VERIFY0(zap_add(dp
->dp_meta_objset
,
2030 dsl_dataset_phys(hds
)->ds_snapnames_zapobj
,
2031 ds
->ds_snapname
, 8, 1, &ds
->ds_object
, tx
));
2033 dsl_dataset_rele(ds
, FTAG
);
2038 dsl_dataset_rename_snapshot_sync(void *arg
, dmu_tx_t
*tx
)
2040 dsl_dataset_rename_snapshot_arg_t
*ddrsa
= arg
;
2041 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
2044 VERIFY0(dsl_dataset_hold(dp
, ddrsa
->ddrsa_fsname
, FTAG
, &hds
));
2045 ddrsa
->ddrsa_tx
= tx
;
2046 if (ddrsa
->ddrsa_recursive
) {
2047 VERIFY0(dmu_objset_find_dp(dp
, hds
->ds_dir
->dd_object
,
2048 dsl_dataset_rename_snapshot_sync_impl
, ddrsa
,
2051 VERIFY0(dsl_dataset_rename_snapshot_sync_impl(dp
, hds
, ddrsa
));
2053 dsl_dataset_rele(hds
, FTAG
);
2057 dsl_dataset_rename_snapshot(const char *fsname
,
2058 const char *oldsnapname
, const char *newsnapname
, boolean_t recursive
)
2060 dsl_dataset_rename_snapshot_arg_t ddrsa
;
2062 ddrsa
.ddrsa_fsname
= fsname
;
2063 ddrsa
.ddrsa_oldsnapname
= oldsnapname
;
2064 ddrsa
.ddrsa_newsnapname
= newsnapname
;
2065 ddrsa
.ddrsa_recursive
= recursive
;
2067 return (dsl_sync_task(fsname
, dsl_dataset_rename_snapshot_check
,
2068 dsl_dataset_rename_snapshot_sync
, &ddrsa
,
2069 1, ZFS_SPACE_CHECK_RESERVED
));
2073 * If we're doing an ownership handoff, we need to make sure that there is
2074 * only one long hold on the dataset. We're not allowed to change anything here
2075 * so we don't permanently release the long hold or regular hold here. We want
2076 * to do this only when syncing to avoid the dataset unexpectedly going away
2077 * when we release the long hold.
2080 dsl_dataset_handoff_check(dsl_dataset_t
*ds
, void *owner
, dmu_tx_t
*tx
)
2084 if (!dmu_tx_is_syncing(tx
))
2087 if (owner
!= NULL
) {
2088 VERIFY3P(ds
->ds_owner
, ==, owner
);
2089 dsl_dataset_long_rele(ds
, owner
);
2092 held
= dsl_dataset_long_held(ds
);
2095 dsl_dataset_long_hold(ds
, owner
);
2098 return (SET_ERROR(EBUSY
));
2103 typedef struct dsl_dataset_rollback_arg
{
2104 const char *ddra_fsname
;
2106 nvlist_t
*ddra_result
;
2107 } dsl_dataset_rollback_arg_t
;
2110 dsl_dataset_rollback_check(void *arg
, dmu_tx_t
*tx
)
2112 dsl_dataset_rollback_arg_t
*ddra
= arg
;
2113 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
2115 int64_t unused_refres_delta
;
2118 error
= dsl_dataset_hold(dp
, ddra
->ddra_fsname
, FTAG
, &ds
);
2122 /* must not be a snapshot */
2123 if (ds
->ds_is_snapshot
) {
2124 dsl_dataset_rele(ds
, FTAG
);
2125 return (SET_ERROR(EINVAL
));
2128 /* must have a most recent snapshot */
2129 if (dsl_dataset_phys(ds
)->ds_prev_snap_txg
< TXG_INITIAL
) {
2130 dsl_dataset_rele(ds
, FTAG
);
2131 return (SET_ERROR(EINVAL
));
2134 /* must not have any bookmarks after the most recent snapshot */
2135 nvlist_t
*proprequest
= fnvlist_alloc();
2136 fnvlist_add_boolean(proprequest
, zfs_prop_to_name(ZFS_PROP_CREATETXG
));
2137 nvlist_t
*bookmarks
= fnvlist_alloc();
2138 error
= dsl_get_bookmarks_impl(ds
, proprequest
, bookmarks
);
2139 fnvlist_free(proprequest
);
2142 for (nvpair_t
*pair
= nvlist_next_nvpair(bookmarks
, NULL
);
2143 pair
!= NULL
; pair
= nvlist_next_nvpair(bookmarks
, pair
)) {
2145 fnvlist_lookup_nvlist(fnvpair_value_nvlist(pair
),
2146 zfs_prop_to_name(ZFS_PROP_CREATETXG
));
2147 uint64_t createtxg
= fnvlist_lookup_uint64(valuenv
, "value");
2148 if (createtxg
> dsl_dataset_phys(ds
)->ds_prev_snap_txg
) {
2149 fnvlist_free(bookmarks
);
2150 dsl_dataset_rele(ds
, FTAG
);
2151 return (SET_ERROR(EEXIST
));
2154 fnvlist_free(bookmarks
);
2156 error
= dsl_dataset_handoff_check(ds
, ddra
->ddra_owner
, tx
);
2158 dsl_dataset_rele(ds
, FTAG
);
2163 * Check if the snap we are rolling back to uses more than
2166 if (ds
->ds_quota
!= 0 &&
2167 dsl_dataset_phys(ds
->ds_prev
)->ds_referenced_bytes
> ds
->ds_quota
) {
2168 dsl_dataset_rele(ds
, FTAG
);
2169 return (SET_ERROR(EDQUOT
));
2173 * When we do the clone swap, we will temporarily use more space
2174 * due to the refreservation (the head will no longer have any
2175 * unique space, so the entire amount of the refreservation will need
2176 * to be free). We will immediately destroy the clone, freeing
2177 * this space, but the freeing happens over many txg's.
2179 unused_refres_delta
= (int64_t)MIN(ds
->ds_reserved
,
2180 dsl_dataset_phys(ds
)->ds_unique_bytes
);
2182 if (unused_refres_delta
> 0 &&
2183 unused_refres_delta
>
2184 dsl_dir_space_available(ds
->ds_dir
, NULL
, 0, TRUE
)) {
2185 dsl_dataset_rele(ds
, FTAG
);
2186 return (SET_ERROR(ENOSPC
));
2189 dsl_dataset_rele(ds
, FTAG
);
2194 dsl_dataset_rollback_sync(void *arg
, dmu_tx_t
*tx
)
2196 dsl_dataset_rollback_arg_t
*ddra
= arg
;
2197 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
2198 dsl_dataset_t
*ds
, *clone
;
2200 char namebuf
[ZFS_MAXNAMELEN
];
2202 VERIFY0(dsl_dataset_hold(dp
, ddra
->ddra_fsname
, FTAG
, &ds
));
2204 dsl_dataset_name(ds
->ds_prev
, namebuf
);
2205 fnvlist_add_string(ddra
->ddra_result
, "target", namebuf
);
2207 cloneobj
= dsl_dataset_create_sync(ds
->ds_dir
, "%rollback",
2208 ds
->ds_prev
, DS_CREATE_FLAG_NODIRTY
, kcred
, tx
);
2210 VERIFY0(dsl_dataset_hold_obj(dp
, cloneobj
, FTAG
, &clone
));
2212 dsl_dataset_clone_swap_sync_impl(clone
, ds
, tx
);
2213 dsl_dataset_zero_zil(ds
, tx
);
2215 dsl_destroy_head_sync_impl(clone
, tx
);
2217 dsl_dataset_rele(clone
, FTAG
);
2218 dsl_dataset_rele(ds
, FTAG
);
2222 * Rolls back the given filesystem or volume to the most recent snapshot.
2223 * The name of the most recent snapshot will be returned under key "target"
2224 * in the result nvlist.
2227 * - The existing dataset MUST be owned by the specified owner at entry
2228 * - Upon return, dataset will still be held by the same owner, whether we
2231 * This mode is required any time the existing filesystem is mounted. See
2232 * notes above zfs_suspend_fs() for further details.
2235 dsl_dataset_rollback(const char *fsname
, void *owner
, nvlist_t
*result
)
2237 dsl_dataset_rollback_arg_t ddra
;
2239 ddra
.ddra_fsname
= fsname
;
2240 ddra
.ddra_owner
= owner
;
2241 ddra
.ddra_result
= result
;
2243 return (dsl_sync_task(fsname
, dsl_dataset_rollback_check
,
2244 dsl_dataset_rollback_sync
, &ddra
,
2245 1, ZFS_SPACE_CHECK_RESERVED
));
2248 struct promotenode
{
2253 typedef struct dsl_dataset_promote_arg
{
2254 const char *ddpa_clonename
;
2255 dsl_dataset_t
*ddpa_clone
;
2256 list_t shared_snaps
, origin_snaps
, clone_snaps
;
2257 dsl_dataset_t
*origin_origin
; /* origin of the origin */
2258 uint64_t used
, comp
, uncomp
, unique
, cloneusedsnap
, originusedsnap
;
2261 } dsl_dataset_promote_arg_t
;
2263 static int snaplist_space(list_t
*l
, uint64_t mintxg
, uint64_t *spacep
);
2264 static int promote_hold(dsl_dataset_promote_arg_t
*ddpa
, dsl_pool_t
*dp
,
2266 static void promote_rele(dsl_dataset_promote_arg_t
*ddpa
, void *tag
);
2269 dsl_dataset_promote_check(void *arg
, dmu_tx_t
*tx
)
2271 dsl_dataset_promote_arg_t
*ddpa
= arg
;
2272 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
2274 struct promotenode
*snap
;
2275 dsl_dataset_t
*origin_ds
;
2279 size_t max_snap_len
;
2281 err
= promote_hold(ddpa
, dp
, FTAG
);
2285 hds
= ddpa
->ddpa_clone
;
2286 max_snap_len
= MAXNAMELEN
- strlen(ddpa
->ddpa_clonename
) - 1;
2288 if (dsl_dataset_phys(hds
)->ds_flags
& DS_FLAG_NOPROMOTE
) {
2289 promote_rele(ddpa
, FTAG
);
2290 return (SET_ERROR(EXDEV
));
2294 * Compute and check the amount of space to transfer. Since this is
2295 * so expensive, don't do the preliminary check.
2297 if (!dmu_tx_is_syncing(tx
)) {
2298 promote_rele(ddpa
, FTAG
);
2302 snap
= list_head(&ddpa
->shared_snaps
);
2303 origin_ds
= snap
->ds
;
2305 /* compute origin's new unique space */
2306 snap
= list_tail(&ddpa
->clone_snaps
);
2307 ASSERT3U(dsl_dataset_phys(snap
->ds
)->ds_prev_snap_obj
, ==,
2308 origin_ds
->ds_object
);
2309 dsl_deadlist_space_range(&snap
->ds
->ds_deadlist
,
2310 dsl_dataset_phys(origin_ds
)->ds_prev_snap_txg
, UINT64_MAX
,
2311 &ddpa
->unique
, &unused
, &unused
);
2314 * Walk the snapshots that we are moving
2316 * Compute space to transfer. Consider the incremental changes
2317 * to used by each snapshot:
2318 * (my used) = (prev's used) + (blocks born) - (blocks killed)
2319 * So each snapshot gave birth to:
2320 * (blocks born) = (my used) - (prev's used) + (blocks killed)
2321 * So a sequence would look like:
2322 * (uN - u(N-1) + kN) + ... + (u1 - u0 + k1) + (u0 - 0 + k0)
2323 * Which simplifies to:
2324 * uN + kN + kN-1 + ... + k1 + k0
2325 * Note however, if we stop before we reach the ORIGIN we get:
2326 * uN + kN + kN-1 + ... + kM - uM-1
2329 ddpa
->used
= dsl_dataset_phys(origin_ds
)->ds_referenced_bytes
;
2330 ddpa
->comp
= dsl_dataset_phys(origin_ds
)->ds_compressed_bytes
;
2331 ddpa
->uncomp
= dsl_dataset_phys(origin_ds
)->ds_uncompressed_bytes
;
2332 for (snap
= list_head(&ddpa
->shared_snaps
); snap
;
2333 snap
= list_next(&ddpa
->shared_snaps
, snap
)) {
2334 uint64_t val
, dlused
, dlcomp
, dluncomp
;
2335 dsl_dataset_t
*ds
= snap
->ds
;
2340 * If there are long holds, we won't be able to evict
2343 if (dsl_dataset_long_held(ds
)) {
2344 err
= SET_ERROR(EBUSY
);
2348 /* Check that the snapshot name does not conflict */
2349 VERIFY0(dsl_dataset_get_snapname(ds
));
2350 if (strlen(ds
->ds_snapname
) >= max_snap_len
) {
2351 err
= SET_ERROR(ENAMETOOLONG
);
2354 err
= dsl_dataset_snap_lookup(hds
, ds
->ds_snapname
, &val
);
2356 (void) strcpy(ddpa
->err_ds
, snap
->ds
->ds_snapname
);
2357 err
= SET_ERROR(EEXIST
);
2363 /* The very first snapshot does not have a deadlist */
2364 if (dsl_dataset_phys(ds
)->ds_prev_snap_obj
== 0)
2367 dsl_deadlist_space(&ds
->ds_deadlist
,
2368 &dlused
, &dlcomp
, &dluncomp
);
2369 ddpa
->used
+= dlused
;
2370 ddpa
->comp
+= dlcomp
;
2371 ddpa
->uncomp
+= dluncomp
;
2375 * If we are a clone of a clone then we never reached ORIGIN,
2376 * so we need to subtract out the clone origin's used space.
2378 if (ddpa
->origin_origin
) {
2380 dsl_dataset_phys(ddpa
->origin_origin
)->ds_referenced_bytes
;
2382 dsl_dataset_phys(ddpa
->origin_origin
)->ds_compressed_bytes
;
2384 dsl_dataset_phys(ddpa
->origin_origin
)->
2385 ds_uncompressed_bytes
;
2388 /* Check that there is enough space and limit headroom here */
2389 err
= dsl_dir_transfer_possible(origin_ds
->ds_dir
, hds
->ds_dir
,
2390 0, ss_mv_cnt
, ddpa
->used
, ddpa
->cr
);
2395 * Compute the amounts of space that will be used by snapshots
2396 * after the promotion (for both origin and clone). For each,
2397 * it is the amount of space that will be on all of their
2398 * deadlists (that was not born before their new origin).
2400 if (dsl_dir_phys(hds
->ds_dir
)->dd_flags
& DD_FLAG_USED_BREAKDOWN
) {
2404 * Note, typically this will not be a clone of a clone,
2405 * so dd_origin_txg will be < TXG_INITIAL, so
2406 * these snaplist_space() -> dsl_deadlist_space_range()
2407 * calls will be fast because they do not have to
2408 * iterate over all bps.
2410 snap
= list_head(&ddpa
->origin_snaps
);
2411 err
= snaplist_space(&ddpa
->shared_snaps
,
2412 snap
->ds
->ds_dir
->dd_origin_txg
, &ddpa
->cloneusedsnap
);
2416 err
= snaplist_space(&ddpa
->clone_snaps
,
2417 snap
->ds
->ds_dir
->dd_origin_txg
, &space
);
2420 ddpa
->cloneusedsnap
+= space
;
2422 if (dsl_dir_phys(origin_ds
->ds_dir
)->dd_flags
&
2423 DD_FLAG_USED_BREAKDOWN
) {
2424 err
= snaplist_space(&ddpa
->origin_snaps
,
2425 dsl_dataset_phys(origin_ds
)->ds_creation_txg
,
2426 &ddpa
->originusedsnap
);
2432 promote_rele(ddpa
, FTAG
);
2437 dsl_dataset_promote_sync(void *arg
, dmu_tx_t
*tx
)
2439 dsl_dataset_promote_arg_t
*ddpa
= arg
;
2440 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
2442 struct promotenode
*snap
;
2443 dsl_dataset_t
*origin_ds
;
2444 dsl_dataset_t
*origin_head
;
2446 dsl_dir_t
*odd
= NULL
;
2447 uint64_t oldnext_obj
;
2450 VERIFY0(promote_hold(ddpa
, dp
, FTAG
));
2451 hds
= ddpa
->ddpa_clone
;
2453 ASSERT0(dsl_dataset_phys(hds
)->ds_flags
& DS_FLAG_NOPROMOTE
);
2455 snap
= list_head(&ddpa
->shared_snaps
);
2456 origin_ds
= snap
->ds
;
2459 snap
= list_head(&ddpa
->origin_snaps
);
2460 origin_head
= snap
->ds
;
2463 * We need to explicitly open odd, since origin_ds's dd will be
2466 VERIFY0(dsl_dir_hold_obj(dp
, origin_ds
->ds_dir
->dd_object
,
2469 /* change origin's next snap */
2470 dmu_buf_will_dirty(origin_ds
->ds_dbuf
, tx
);
2471 oldnext_obj
= dsl_dataset_phys(origin_ds
)->ds_next_snap_obj
;
2472 snap
= list_tail(&ddpa
->clone_snaps
);
2473 ASSERT3U(dsl_dataset_phys(snap
->ds
)->ds_prev_snap_obj
, ==,
2474 origin_ds
->ds_object
);
2475 dsl_dataset_phys(origin_ds
)->ds_next_snap_obj
= snap
->ds
->ds_object
;
2477 /* change the origin's next clone */
2478 if (dsl_dataset_phys(origin_ds
)->ds_next_clones_obj
) {
2479 dsl_dataset_remove_from_next_clones(origin_ds
,
2480 snap
->ds
->ds_object
, tx
);
2481 VERIFY0(zap_add_int(dp
->dp_meta_objset
,
2482 dsl_dataset_phys(origin_ds
)->ds_next_clones_obj
,
2487 dmu_buf_will_dirty(dd
->dd_dbuf
, tx
);
2488 ASSERT3U(dsl_dir_phys(dd
)->dd_origin_obj
, ==, origin_ds
->ds_object
);
2489 dsl_dir_phys(dd
)->dd_origin_obj
= dsl_dir_phys(odd
)->dd_origin_obj
;
2490 dd
->dd_origin_txg
= origin_head
->ds_dir
->dd_origin_txg
;
2491 dmu_buf_will_dirty(odd
->dd_dbuf
, tx
);
2492 dsl_dir_phys(odd
)->dd_origin_obj
= origin_ds
->ds_object
;
2493 origin_head
->ds_dir
->dd_origin_txg
=
2494 dsl_dataset_phys(origin_ds
)->ds_creation_txg
;
2496 /* change dd_clone entries */
2497 if (spa_version(dp
->dp_spa
) >= SPA_VERSION_DIR_CLONES
) {
2498 VERIFY0(zap_remove_int(dp
->dp_meta_objset
,
2499 dsl_dir_phys(odd
)->dd_clones
, hds
->ds_object
, tx
));
2500 VERIFY0(zap_add_int(dp
->dp_meta_objset
,
2501 dsl_dir_phys(ddpa
->origin_origin
->ds_dir
)->dd_clones
,
2502 hds
->ds_object
, tx
));
2504 VERIFY0(zap_remove_int(dp
->dp_meta_objset
,
2505 dsl_dir_phys(ddpa
->origin_origin
->ds_dir
)->dd_clones
,
2506 origin_head
->ds_object
, tx
));
2507 if (dsl_dir_phys(dd
)->dd_clones
== 0) {
2508 dsl_dir_phys(dd
)->dd_clones
=
2509 zap_create(dp
->dp_meta_objset
, DMU_OT_DSL_CLONES
,
2510 DMU_OT_NONE
, 0, tx
);
2512 VERIFY0(zap_add_int(dp
->dp_meta_objset
,
2513 dsl_dir_phys(dd
)->dd_clones
, origin_head
->ds_object
, tx
));
2516 /* move snapshots to this dir */
2517 for (snap
= list_head(&ddpa
->shared_snaps
); snap
;
2518 snap
= list_next(&ddpa
->shared_snaps
, snap
)) {
2519 dsl_dataset_t
*ds
= snap
->ds
;
2522 * Property callbacks are registered to a particular
2523 * dsl_dir. Since ours is changing, evict the objset
2524 * so that they will be unregistered from the old dsl_dir.
2526 if (ds
->ds_objset
) {
2527 dmu_objset_evict(ds
->ds_objset
);
2528 ds
->ds_objset
= NULL
;
2531 /* move snap name entry */
2532 VERIFY0(dsl_dataset_get_snapname(ds
));
2533 VERIFY0(dsl_dataset_snap_remove(origin_head
,
2534 ds
->ds_snapname
, tx
, B_TRUE
));
2535 VERIFY0(zap_add(dp
->dp_meta_objset
,
2536 dsl_dataset_phys(hds
)->ds_snapnames_zapobj
, ds
->ds_snapname
,
2537 8, 1, &ds
->ds_object
, tx
));
2538 dsl_fs_ss_count_adjust(hds
->ds_dir
, 1,
2539 DD_FIELD_SNAPSHOT_COUNT
, tx
);
2541 /* change containing dsl_dir */
2542 dmu_buf_will_dirty(ds
->ds_dbuf
, tx
);
2543 ASSERT3U(dsl_dataset_phys(ds
)->ds_dir_obj
, ==, odd
->dd_object
);
2544 dsl_dataset_phys(ds
)->ds_dir_obj
= dd
->dd_object
;
2545 ASSERT3P(ds
->ds_dir
, ==, odd
);
2546 dsl_dir_rele(ds
->ds_dir
, ds
);
2547 VERIFY0(dsl_dir_hold_obj(dp
, dd
->dd_object
,
2548 NULL
, ds
, &ds
->ds_dir
));
2550 /* move any clone references */
2551 if (dsl_dataset_phys(ds
)->ds_next_clones_obj
&&
2552 spa_version(dp
->dp_spa
) >= SPA_VERSION_DIR_CLONES
) {
2556 for (zap_cursor_init(&zc
, dp
->dp_meta_objset
,
2557 dsl_dataset_phys(ds
)->ds_next_clones_obj
);
2558 zap_cursor_retrieve(&zc
, &za
) == 0;
2559 zap_cursor_advance(&zc
)) {
2560 dsl_dataset_t
*cnds
;
2563 if (za
.za_first_integer
== oldnext_obj
) {
2565 * We've already moved the
2566 * origin's reference.
2571 VERIFY0(dsl_dataset_hold_obj(dp
,
2572 za
.za_first_integer
, FTAG
, &cnds
));
2573 o
= dsl_dir_phys(cnds
->ds_dir
)->
2574 dd_head_dataset_obj
;
2576 VERIFY0(zap_remove_int(dp
->dp_meta_objset
,
2577 dsl_dir_phys(odd
)->dd_clones
, o
, tx
));
2578 VERIFY0(zap_add_int(dp
->dp_meta_objset
,
2579 dsl_dir_phys(dd
)->dd_clones
, o
, tx
));
2580 dsl_dataset_rele(cnds
, FTAG
);
2582 zap_cursor_fini(&zc
);
2585 ASSERT(!dsl_prop_hascb(ds
));
2589 * Change space accounting.
2590 * Note, pa->*usedsnap and dd_used_breakdown[SNAP] will either
2591 * both be valid, or both be 0 (resulting in delta == 0). This
2592 * is true for each of {clone,origin} independently.
2595 delta
= ddpa
->cloneusedsnap
-
2596 dsl_dir_phys(dd
)->dd_used_breakdown
[DD_USED_SNAP
];
2597 ASSERT3S(delta
, >=, 0);
2598 ASSERT3U(ddpa
->used
, >=, delta
);
2599 dsl_dir_diduse_space(dd
, DD_USED_SNAP
, delta
, 0, 0, tx
);
2600 dsl_dir_diduse_space(dd
, DD_USED_HEAD
,
2601 ddpa
->used
- delta
, ddpa
->comp
, ddpa
->uncomp
, tx
);
2603 delta
= ddpa
->originusedsnap
-
2604 dsl_dir_phys(odd
)->dd_used_breakdown
[DD_USED_SNAP
];
2605 ASSERT3S(delta
, <=, 0);
2606 ASSERT3U(ddpa
->used
, >=, -delta
);
2607 dsl_dir_diduse_space(odd
, DD_USED_SNAP
, delta
, 0, 0, tx
);
2608 dsl_dir_diduse_space(odd
, DD_USED_HEAD
,
2609 -ddpa
->used
- delta
, -ddpa
->comp
, -ddpa
->uncomp
, tx
);
2611 dsl_dataset_phys(origin_ds
)->ds_unique_bytes
= ddpa
->unique
;
2613 /* log history record */
2614 spa_history_log_internal_ds(hds
, "promote", tx
, "");
2616 dsl_dir_rele(odd
, FTAG
);
2617 promote_rele(ddpa
, FTAG
);
2621 * Make a list of dsl_dataset_t's for the snapshots between first_obj
2622 * (exclusive) and last_obj (inclusive). The list will be in reverse
2623 * order (last_obj will be the list_head()). If first_obj == 0, do all
2624 * snapshots back to this dataset's origin.
2627 snaplist_make(dsl_pool_t
*dp
,
2628 uint64_t first_obj
, uint64_t last_obj
, list_t
*l
, void *tag
)
2630 uint64_t obj
= last_obj
;
2632 list_create(l
, sizeof (struct promotenode
),
2633 offsetof(struct promotenode
, link
));
2635 while (obj
!= first_obj
) {
2637 struct promotenode
*snap
;
2640 err
= dsl_dataset_hold_obj(dp
, obj
, tag
, &ds
);
2641 ASSERT(err
!= ENOENT
);
2646 first_obj
= dsl_dir_phys(ds
->ds_dir
)->dd_origin_obj
;
2648 snap
= kmem_alloc(sizeof (*snap
), KM_SLEEP
);
2650 list_insert_tail(l
, snap
);
2651 obj
= dsl_dataset_phys(ds
)->ds_prev_snap_obj
;
2658 snaplist_space(list_t
*l
, uint64_t mintxg
, uint64_t *spacep
)
2660 struct promotenode
*snap
;
2663 for (snap
= list_head(l
); snap
; snap
= list_next(l
, snap
)) {
2664 uint64_t used
, comp
, uncomp
;
2665 dsl_deadlist_space_range(&snap
->ds
->ds_deadlist
,
2666 mintxg
, UINT64_MAX
, &used
, &comp
, &uncomp
);
2673 snaplist_destroy(list_t
*l
, void *tag
)
2675 struct promotenode
*snap
;
2677 if (l
== NULL
|| !list_link_active(&l
->list_head
))
2680 while ((snap
= list_tail(l
)) != NULL
) {
2681 list_remove(l
, snap
);
2682 dsl_dataset_rele(snap
->ds
, tag
);
2683 kmem_free(snap
, sizeof (*snap
));
2689 promote_hold(dsl_dataset_promote_arg_t
*ddpa
, dsl_pool_t
*dp
, void *tag
)
2693 struct promotenode
*snap
;
2695 error
= dsl_dataset_hold(dp
, ddpa
->ddpa_clonename
, tag
,
2699 dd
= ddpa
->ddpa_clone
->ds_dir
;
2701 if (ddpa
->ddpa_clone
->ds_is_snapshot
||
2702 !dsl_dir_is_clone(dd
)) {
2703 dsl_dataset_rele(ddpa
->ddpa_clone
, tag
);
2704 return (SET_ERROR(EINVAL
));
2707 error
= snaplist_make(dp
, 0, dsl_dir_phys(dd
)->dd_origin_obj
,
2708 &ddpa
->shared_snaps
, tag
);
2712 error
= snaplist_make(dp
, 0, ddpa
->ddpa_clone
->ds_object
,
2713 &ddpa
->clone_snaps
, tag
);
2717 snap
= list_head(&ddpa
->shared_snaps
);
2718 ASSERT3U(snap
->ds
->ds_object
, ==, dsl_dir_phys(dd
)->dd_origin_obj
);
2719 error
= snaplist_make(dp
, dsl_dir_phys(dd
)->dd_origin_obj
,
2720 dsl_dir_phys(snap
->ds
->ds_dir
)->dd_head_dataset_obj
,
2721 &ddpa
->origin_snaps
, tag
);
2725 if (dsl_dir_phys(snap
->ds
->ds_dir
)->dd_origin_obj
!= 0) {
2726 error
= dsl_dataset_hold_obj(dp
,
2727 dsl_dir_phys(snap
->ds
->ds_dir
)->dd_origin_obj
,
2728 tag
, &ddpa
->origin_origin
);
2734 promote_rele(ddpa
, tag
);
2739 promote_rele(dsl_dataset_promote_arg_t
*ddpa
, void *tag
)
2741 snaplist_destroy(&ddpa
->shared_snaps
, tag
);
2742 snaplist_destroy(&ddpa
->clone_snaps
, tag
);
2743 snaplist_destroy(&ddpa
->origin_snaps
, tag
);
2744 if (ddpa
->origin_origin
!= NULL
)
2745 dsl_dataset_rele(ddpa
->origin_origin
, tag
);
2746 dsl_dataset_rele(ddpa
->ddpa_clone
, tag
);
2752 * If it fails due to a conflicting snapshot name, "conflsnap" will be filled
2753 * in with the name. (It must be at least MAXNAMELEN bytes long.)
2756 dsl_dataset_promote(const char *name
, char *conflsnap
)
2758 dsl_dataset_promote_arg_t ddpa
= { 0 };
2764 * We will modify space proportional to the number of
2765 * snapshots. Compute numsnaps.
2767 error
= dmu_objset_hold(name
, FTAG
, &os
);
2770 error
= zap_count(dmu_objset_pool(os
)->dp_meta_objset
,
2771 dsl_dataset_phys(dmu_objset_ds(os
))->ds_snapnames_zapobj
,
2773 dmu_objset_rele(os
, FTAG
);
2777 ddpa
.ddpa_clonename
= name
;
2778 ddpa
.err_ds
= conflsnap
;
2781 return (dsl_sync_task(name
, dsl_dataset_promote_check
,
2782 dsl_dataset_promote_sync
, &ddpa
,
2783 2 + numsnaps
, ZFS_SPACE_CHECK_RESERVED
));
2787 dsl_dataset_clone_swap_check_impl(dsl_dataset_t
*clone
,
2788 dsl_dataset_t
*origin_head
, boolean_t force
, void *owner
, dmu_tx_t
*tx
)
2790 int64_t unused_refres_delta
;
2792 /* they should both be heads */
2793 if (clone
->ds_is_snapshot
||
2794 origin_head
->ds_is_snapshot
)
2795 return (SET_ERROR(EINVAL
));
2797 /* if we are not forcing, the branch point should be just before them */
2798 if (!force
&& clone
->ds_prev
!= origin_head
->ds_prev
)
2799 return (SET_ERROR(EINVAL
));
2801 /* clone should be the clone (unless they are unrelated) */
2802 if (clone
->ds_prev
!= NULL
&&
2803 clone
->ds_prev
!= clone
->ds_dir
->dd_pool
->dp_origin_snap
&&
2804 origin_head
->ds_dir
!= clone
->ds_prev
->ds_dir
)
2805 return (SET_ERROR(EINVAL
));
2807 /* the clone should be a child of the origin */
2808 if (clone
->ds_dir
->dd_parent
!= origin_head
->ds_dir
)
2809 return (SET_ERROR(EINVAL
));
2811 /* origin_head shouldn't be modified unless 'force' */
2813 dsl_dataset_modified_since_snap(origin_head
, origin_head
->ds_prev
))
2814 return (SET_ERROR(ETXTBSY
));
2816 /* origin_head should have no long holds (e.g. is not mounted) */
2817 if (dsl_dataset_handoff_check(origin_head
, owner
, tx
))
2818 return (SET_ERROR(EBUSY
));
2820 /* check amount of any unconsumed refreservation */
2821 unused_refres_delta
=
2822 (int64_t)MIN(origin_head
->ds_reserved
,
2823 dsl_dataset_phys(origin_head
)->ds_unique_bytes
) -
2824 (int64_t)MIN(origin_head
->ds_reserved
,
2825 dsl_dataset_phys(clone
)->ds_unique_bytes
);
2827 if (unused_refres_delta
> 0 &&
2828 unused_refres_delta
>
2829 dsl_dir_space_available(origin_head
->ds_dir
, NULL
, 0, TRUE
))
2830 return (SET_ERROR(ENOSPC
));
2832 /* clone can't be over the head's refquota */
2833 if (origin_head
->ds_quota
!= 0 &&
2834 dsl_dataset_phys(clone
)->ds_referenced_bytes
>
2835 origin_head
->ds_quota
)
2836 return (SET_ERROR(EDQUOT
));
2842 dsl_dataset_clone_swap_sync_impl(dsl_dataset_t
*clone
,
2843 dsl_dataset_t
*origin_head
, dmu_tx_t
*tx
)
2845 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
2846 int64_t unused_refres_delta
;
2848 ASSERT(clone
->ds_reserved
== 0);
2849 ASSERT(origin_head
->ds_quota
== 0 ||
2850 dsl_dataset_phys(clone
)->ds_unique_bytes
<= origin_head
->ds_quota
);
2851 ASSERT3P(clone
->ds_prev
, ==, origin_head
->ds_prev
);
2854 * Swap per-dataset feature flags.
2856 for (spa_feature_t f
= 0; f
< SPA_FEATURES
; f
++) {
2857 if (!(spa_feature_table
[f
].fi_flags
&
2858 ZFEATURE_FLAG_PER_DATASET
)) {
2859 ASSERT(!clone
->ds_feature_inuse
[f
]);
2860 ASSERT(!origin_head
->ds_feature_inuse
[f
]);
2864 boolean_t clone_inuse
= clone
->ds_feature_inuse
[f
];
2865 boolean_t origin_head_inuse
= origin_head
->ds_feature_inuse
[f
];
2868 dsl_dataset_deactivate_feature(clone
->ds_object
, f
, tx
);
2869 clone
->ds_feature_inuse
[f
] = B_FALSE
;
2871 if (origin_head_inuse
) {
2872 dsl_dataset_deactivate_feature(origin_head
->ds_object
,
2874 origin_head
->ds_feature_inuse
[f
] = B_FALSE
;
2877 dsl_dataset_activate_feature(origin_head
->ds_object
,
2879 origin_head
->ds_feature_inuse
[f
] = B_TRUE
;
2881 if (origin_head_inuse
) {
2882 dsl_dataset_activate_feature(clone
->ds_object
, f
, tx
);
2883 clone
->ds_feature_inuse
[f
] = B_TRUE
;
2887 dmu_buf_will_dirty(clone
->ds_dbuf
, tx
);
2888 dmu_buf_will_dirty(origin_head
->ds_dbuf
, tx
);
2890 if (clone
->ds_objset
!= NULL
) {
2891 dmu_objset_evict(clone
->ds_objset
);
2892 clone
->ds_objset
= NULL
;
2895 if (origin_head
->ds_objset
!= NULL
) {
2896 dmu_objset_evict(origin_head
->ds_objset
);
2897 origin_head
->ds_objset
= NULL
;
2900 unused_refres_delta
=
2901 (int64_t)MIN(origin_head
->ds_reserved
,
2902 dsl_dataset_phys(origin_head
)->ds_unique_bytes
) -
2903 (int64_t)MIN(origin_head
->ds_reserved
,
2904 dsl_dataset_phys(clone
)->ds_unique_bytes
);
2907 * Reset origin's unique bytes, if it exists.
2909 if (clone
->ds_prev
) {
2910 dsl_dataset_t
*origin
= clone
->ds_prev
;
2911 uint64_t comp
, uncomp
;
2913 dmu_buf_will_dirty(origin
->ds_dbuf
, tx
);
2914 dsl_deadlist_space_range(&clone
->ds_deadlist
,
2915 dsl_dataset_phys(origin
)->ds_prev_snap_txg
, UINT64_MAX
,
2916 &dsl_dataset_phys(origin
)->ds_unique_bytes
, &comp
, &uncomp
);
2922 tmp
= dsl_dataset_phys(origin_head
)->ds_bp
;
2923 dsl_dataset_phys(origin_head
)->ds_bp
=
2924 dsl_dataset_phys(clone
)->ds_bp
;
2925 dsl_dataset_phys(clone
)->ds_bp
= tmp
;
2928 /* set dd_*_bytes */
2930 int64_t dused
, dcomp
, duncomp
;
2931 uint64_t cdl_used
, cdl_comp
, cdl_uncomp
;
2932 uint64_t odl_used
, odl_comp
, odl_uncomp
;
2934 ASSERT3U(dsl_dir_phys(clone
->ds_dir
)->
2935 dd_used_breakdown
[DD_USED_SNAP
], ==, 0);
2937 dsl_deadlist_space(&clone
->ds_deadlist
,
2938 &cdl_used
, &cdl_comp
, &cdl_uncomp
);
2939 dsl_deadlist_space(&origin_head
->ds_deadlist
,
2940 &odl_used
, &odl_comp
, &odl_uncomp
);
2942 dused
= dsl_dataset_phys(clone
)->ds_referenced_bytes
+
2944 (dsl_dataset_phys(origin_head
)->ds_referenced_bytes
+
2946 dcomp
= dsl_dataset_phys(clone
)->ds_compressed_bytes
+
2948 (dsl_dataset_phys(origin_head
)->ds_compressed_bytes
+
2950 duncomp
= dsl_dataset_phys(clone
)->ds_uncompressed_bytes
+
2952 (dsl_dataset_phys(origin_head
)->ds_uncompressed_bytes
+
2955 dsl_dir_diduse_space(origin_head
->ds_dir
, DD_USED_HEAD
,
2956 dused
, dcomp
, duncomp
, tx
);
2957 dsl_dir_diduse_space(clone
->ds_dir
, DD_USED_HEAD
,
2958 -dused
, -dcomp
, -duncomp
, tx
);
2961 * The difference in the space used by snapshots is the
2962 * difference in snapshot space due to the head's
2963 * deadlist (since that's the only thing that's
2964 * changing that affects the snapused).
2966 dsl_deadlist_space_range(&clone
->ds_deadlist
,
2967 origin_head
->ds_dir
->dd_origin_txg
, UINT64_MAX
,
2968 &cdl_used
, &cdl_comp
, &cdl_uncomp
);
2969 dsl_deadlist_space_range(&origin_head
->ds_deadlist
,
2970 origin_head
->ds_dir
->dd_origin_txg
, UINT64_MAX
,
2971 &odl_used
, &odl_comp
, &odl_uncomp
);
2972 dsl_dir_transfer_space(origin_head
->ds_dir
, cdl_used
- odl_used
,
2973 DD_USED_HEAD
, DD_USED_SNAP
, tx
);
2976 /* swap ds_*_bytes */
2977 SWITCH64(dsl_dataset_phys(origin_head
)->ds_referenced_bytes
,
2978 dsl_dataset_phys(clone
)->ds_referenced_bytes
);
2979 SWITCH64(dsl_dataset_phys(origin_head
)->ds_compressed_bytes
,
2980 dsl_dataset_phys(clone
)->ds_compressed_bytes
);
2981 SWITCH64(dsl_dataset_phys(origin_head
)->ds_uncompressed_bytes
,
2982 dsl_dataset_phys(clone
)->ds_uncompressed_bytes
);
2983 SWITCH64(dsl_dataset_phys(origin_head
)->ds_unique_bytes
,
2984 dsl_dataset_phys(clone
)->ds_unique_bytes
);
2986 /* apply any parent delta for change in unconsumed refreservation */
2987 dsl_dir_diduse_space(origin_head
->ds_dir
, DD_USED_REFRSRV
,
2988 unused_refres_delta
, 0, 0, tx
);
2993 dsl_deadlist_close(&clone
->ds_deadlist
);
2994 dsl_deadlist_close(&origin_head
->ds_deadlist
);
2995 SWITCH64(dsl_dataset_phys(origin_head
)->ds_deadlist_obj
,
2996 dsl_dataset_phys(clone
)->ds_deadlist_obj
);
2997 dsl_deadlist_open(&clone
->ds_deadlist
, dp
->dp_meta_objset
,
2998 dsl_dataset_phys(clone
)->ds_deadlist_obj
);
2999 dsl_deadlist_open(&origin_head
->ds_deadlist
, dp
->dp_meta_objset
,
3000 dsl_dataset_phys(origin_head
)->ds_deadlist_obj
);
3002 dsl_scan_ds_clone_swapped(origin_head
, clone
, tx
);
3004 spa_history_log_internal_ds(clone
, "clone swap", tx
,
3005 "parent=%s", origin_head
->ds_dir
->dd_myname
);
3009 * Given a pool name and a dataset object number in that pool,
3010 * return the name of that dataset.
3013 dsl_dsobj_to_dsname(char *pname
, uint64_t obj
, char *buf
)
3019 error
= dsl_pool_hold(pname
, FTAG
, &dp
);
3023 error
= dsl_dataset_hold_obj(dp
, obj
, FTAG
, &ds
);
3025 dsl_dataset_name(ds
, buf
);
3026 dsl_dataset_rele(ds
, FTAG
);
3028 dsl_pool_rele(dp
, FTAG
);
3034 dsl_dataset_check_quota(dsl_dataset_t
*ds
, boolean_t check_quota
,
3035 uint64_t asize
, uint64_t inflight
, uint64_t *used
, uint64_t *ref_rsrv
)
3039 ASSERT3S(asize
, >, 0);
3042 * *ref_rsrv is the portion of asize that will come from any
3043 * unconsumed refreservation space.
3047 mutex_enter(&ds
->ds_lock
);
3049 * Make a space adjustment for reserved bytes.
3051 if (ds
->ds_reserved
> dsl_dataset_phys(ds
)->ds_unique_bytes
) {
3053 ds
->ds_reserved
- dsl_dataset_phys(ds
)->ds_unique_bytes
);
3055 (ds
->ds_reserved
- dsl_dataset_phys(ds
)->ds_unique_bytes
);
3057 asize
- MIN(asize
, parent_delta(ds
, asize
+ inflight
));
3060 if (!check_quota
|| ds
->ds_quota
== 0) {
3061 mutex_exit(&ds
->ds_lock
);
3065 * If they are requesting more space, and our current estimate
3066 * is over quota, they get to try again unless the actual
3067 * on-disk is over quota and there are no pending changes (which
3068 * may free up space for us).
3070 if (dsl_dataset_phys(ds
)->ds_referenced_bytes
+ inflight
>=
3073 dsl_dataset_phys(ds
)->ds_referenced_bytes
< ds
->ds_quota
)
3074 error
= SET_ERROR(ERESTART
);
3076 error
= SET_ERROR(EDQUOT
);
3078 mutex_exit(&ds
->ds_lock
);
3083 typedef struct dsl_dataset_set_qr_arg
{
3084 const char *ddsqra_name
;
3085 zprop_source_t ddsqra_source
;
3086 uint64_t ddsqra_value
;
3087 } dsl_dataset_set_qr_arg_t
;
3092 dsl_dataset_set_refquota_check(void *arg
, dmu_tx_t
*tx
)
3094 dsl_dataset_set_qr_arg_t
*ddsqra
= arg
;
3095 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
3100 if (spa_version(dp
->dp_spa
) < SPA_VERSION_REFQUOTA
)
3101 return (SET_ERROR(ENOTSUP
));
3103 error
= dsl_dataset_hold(dp
, ddsqra
->ddsqra_name
, FTAG
, &ds
);
3107 if (ds
->ds_is_snapshot
) {
3108 dsl_dataset_rele(ds
, FTAG
);
3109 return (SET_ERROR(EINVAL
));
3112 error
= dsl_prop_predict(ds
->ds_dir
,
3113 zfs_prop_to_name(ZFS_PROP_REFQUOTA
),
3114 ddsqra
->ddsqra_source
, ddsqra
->ddsqra_value
, &newval
);
3116 dsl_dataset_rele(ds
, FTAG
);
3121 dsl_dataset_rele(ds
, FTAG
);
3125 if (newval
< dsl_dataset_phys(ds
)->ds_referenced_bytes
||
3126 newval
< ds
->ds_reserved
) {
3127 dsl_dataset_rele(ds
, FTAG
);
3128 return (SET_ERROR(ENOSPC
));
3131 dsl_dataset_rele(ds
, FTAG
);
3136 dsl_dataset_set_refquota_sync(void *arg
, dmu_tx_t
*tx
)
3138 dsl_dataset_set_qr_arg_t
*ddsqra
= arg
;
3139 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
3143 VERIFY0(dsl_dataset_hold(dp
, ddsqra
->ddsqra_name
, FTAG
, &ds
));
3145 dsl_prop_set_sync_impl(ds
,
3146 zfs_prop_to_name(ZFS_PROP_REFQUOTA
),
3147 ddsqra
->ddsqra_source
, sizeof (ddsqra
->ddsqra_value
), 1,
3148 &ddsqra
->ddsqra_value
, tx
);
3150 VERIFY0(dsl_prop_get_int_ds(ds
,
3151 zfs_prop_to_name(ZFS_PROP_REFQUOTA
), &newval
));
3153 if (ds
->ds_quota
!= newval
) {
3154 dmu_buf_will_dirty(ds
->ds_dbuf
, tx
);
3155 ds
->ds_quota
= newval
;
3157 dsl_dataset_rele(ds
, FTAG
);
3161 dsl_dataset_set_refquota(const char *dsname
, zprop_source_t source
,
3164 dsl_dataset_set_qr_arg_t ddsqra
;
3166 ddsqra
.ddsqra_name
= dsname
;
3167 ddsqra
.ddsqra_source
= source
;
3168 ddsqra
.ddsqra_value
= refquota
;
3170 return (dsl_sync_task(dsname
, dsl_dataset_set_refquota_check
,
3171 dsl_dataset_set_refquota_sync
, &ddsqra
, 0, ZFS_SPACE_CHECK_NONE
));
3175 dsl_dataset_set_refreservation_check(void *arg
, dmu_tx_t
*tx
)
3177 dsl_dataset_set_qr_arg_t
*ddsqra
= arg
;
3178 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
3181 uint64_t newval
, unique
;
3183 if (spa_version(dp
->dp_spa
) < SPA_VERSION_REFRESERVATION
)
3184 return (SET_ERROR(ENOTSUP
));
3186 error
= dsl_dataset_hold(dp
, ddsqra
->ddsqra_name
, FTAG
, &ds
);
3190 if (ds
->ds_is_snapshot
) {
3191 dsl_dataset_rele(ds
, FTAG
);
3192 return (SET_ERROR(EINVAL
));
3195 error
= dsl_prop_predict(ds
->ds_dir
,
3196 zfs_prop_to_name(ZFS_PROP_REFRESERVATION
),
3197 ddsqra
->ddsqra_source
, ddsqra
->ddsqra_value
, &newval
);
3199 dsl_dataset_rele(ds
, FTAG
);
3204 * If we are doing the preliminary check in open context, the
3205 * space estimates may be inaccurate.
3207 if (!dmu_tx_is_syncing(tx
)) {
3208 dsl_dataset_rele(ds
, FTAG
);
3212 mutex_enter(&ds
->ds_lock
);
3213 if (!DS_UNIQUE_IS_ACCURATE(ds
))
3214 dsl_dataset_recalc_head_uniq(ds
);
3215 unique
= dsl_dataset_phys(ds
)->ds_unique_bytes
;
3216 mutex_exit(&ds
->ds_lock
);
3218 if (MAX(unique
, newval
) > MAX(unique
, ds
->ds_reserved
)) {
3219 uint64_t delta
= MAX(unique
, newval
) -
3220 MAX(unique
, ds
->ds_reserved
);
3223 dsl_dir_space_available(ds
->ds_dir
, NULL
, 0, B_TRUE
) ||
3224 (ds
->ds_quota
> 0 && newval
> ds
->ds_quota
)) {
3225 dsl_dataset_rele(ds
, FTAG
);
3226 return (SET_ERROR(ENOSPC
));
3230 dsl_dataset_rele(ds
, FTAG
);
3235 dsl_dataset_set_refreservation_sync_impl(dsl_dataset_t
*ds
,
3236 zprop_source_t source
, uint64_t value
, dmu_tx_t
*tx
)
3242 dsl_prop_set_sync_impl(ds
, zfs_prop_to_name(ZFS_PROP_REFRESERVATION
),
3243 source
, sizeof (value
), 1, &value
, tx
);
3245 VERIFY0(dsl_prop_get_int_ds(ds
,
3246 zfs_prop_to_name(ZFS_PROP_REFRESERVATION
), &newval
));
3248 dmu_buf_will_dirty(ds
->ds_dbuf
, tx
);
3249 mutex_enter(&ds
->ds_dir
->dd_lock
);
3250 mutex_enter(&ds
->ds_lock
);
3251 ASSERT(DS_UNIQUE_IS_ACCURATE(ds
));
3252 unique
= dsl_dataset_phys(ds
)->ds_unique_bytes
;
3253 delta
= MAX(0, (int64_t)(newval
- unique
)) -
3254 MAX(0, (int64_t)(ds
->ds_reserved
- unique
));
3255 ds
->ds_reserved
= newval
;
3256 mutex_exit(&ds
->ds_lock
);
3258 dsl_dir_diduse_space(ds
->ds_dir
, DD_USED_REFRSRV
, delta
, 0, 0, tx
);
3259 mutex_exit(&ds
->ds_dir
->dd_lock
);
3263 dsl_dataset_set_refreservation_sync(void *arg
, dmu_tx_t
*tx
)
3265 dsl_dataset_set_qr_arg_t
*ddsqra
= arg
;
3266 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
3269 VERIFY0(dsl_dataset_hold(dp
, ddsqra
->ddsqra_name
, FTAG
, &ds
));
3270 dsl_dataset_set_refreservation_sync_impl(ds
,
3271 ddsqra
->ddsqra_source
, ddsqra
->ddsqra_value
, tx
);
3272 dsl_dataset_rele(ds
, FTAG
);
3276 dsl_dataset_set_refreservation(const char *dsname
, zprop_source_t source
,
3277 uint64_t refreservation
)
3279 dsl_dataset_set_qr_arg_t ddsqra
;
3281 ddsqra
.ddsqra_name
= dsname
;
3282 ddsqra
.ddsqra_source
= source
;
3283 ddsqra
.ddsqra_value
= refreservation
;
3285 return (dsl_sync_task(dsname
, dsl_dataset_set_refreservation_check
,
3286 dsl_dataset_set_refreservation_sync
, &ddsqra
,
3287 0, ZFS_SPACE_CHECK_NONE
));
3291 * Return (in *usedp) the amount of space written in new that is not
3292 * present in oldsnap. New may be a snapshot or the head. Old must be
3293 * a snapshot before new, in new's filesystem (or its origin). If not then
3294 * fail and return EINVAL.
3296 * The written space is calculated by considering two components: First, we
3297 * ignore any freed space, and calculate the written as new's used space
3298 * minus old's used space. Next, we add in the amount of space that was freed
3299 * between the two snapshots, thus reducing new's used space relative to old's.
3300 * Specifically, this is the space that was born before old->ds_creation_txg,
3301 * and freed before new (ie. on new's deadlist or a previous deadlist).
3303 * space freed [---------------------]
3304 * snapshots ---O-------O--------O-------O------
3308 dsl_dataset_space_written(dsl_dataset_t
*oldsnap
, dsl_dataset_t
*new,
3309 uint64_t *usedp
, uint64_t *compp
, uint64_t *uncompp
)
3313 dsl_pool_t
*dp
= new->ds_dir
->dd_pool
;
3315 ASSERT(dsl_pool_config_held(dp
));
3318 *usedp
+= dsl_dataset_phys(new)->ds_referenced_bytes
;
3319 *usedp
-= dsl_dataset_phys(oldsnap
)->ds_referenced_bytes
;
3322 *compp
+= dsl_dataset_phys(new)->ds_compressed_bytes
;
3323 *compp
-= dsl_dataset_phys(oldsnap
)->ds_compressed_bytes
;
3326 *uncompp
+= dsl_dataset_phys(new)->ds_uncompressed_bytes
;
3327 *uncompp
-= dsl_dataset_phys(oldsnap
)->ds_uncompressed_bytes
;
3329 snapobj
= new->ds_object
;
3330 while (snapobj
!= oldsnap
->ds_object
) {
3331 dsl_dataset_t
*snap
;
3332 uint64_t used
, comp
, uncomp
;
3334 if (snapobj
== new->ds_object
) {
3337 err
= dsl_dataset_hold_obj(dp
, snapobj
, FTAG
, &snap
);
3342 if (dsl_dataset_phys(snap
)->ds_prev_snap_txg
==
3343 dsl_dataset_phys(oldsnap
)->ds_creation_txg
) {
3345 * The blocks in the deadlist can not be born after
3346 * ds_prev_snap_txg, so get the whole deadlist space,
3347 * which is more efficient (especially for old-format
3348 * deadlists). Unfortunately the deadlist code
3349 * doesn't have enough information to make this
3350 * optimization itself.
3352 dsl_deadlist_space(&snap
->ds_deadlist
,
3353 &used
, &comp
, &uncomp
);
3355 dsl_deadlist_space_range(&snap
->ds_deadlist
,
3356 0, dsl_dataset_phys(oldsnap
)->ds_creation_txg
,
3357 &used
, &comp
, &uncomp
);
3364 * If we get to the beginning of the chain of snapshots
3365 * (ds_prev_snap_obj == 0) before oldsnap, then oldsnap
3366 * was not a snapshot of/before new.
3368 snapobj
= dsl_dataset_phys(snap
)->ds_prev_snap_obj
;
3370 dsl_dataset_rele(snap
, FTAG
);
3372 err
= SET_ERROR(EINVAL
);
3381 * Return (in *usedp) the amount of space that will be reclaimed if firstsnap,
3382 * lastsnap, and all snapshots in between are deleted.
3384 * blocks that would be freed [---------------------------]
3385 * snapshots ---O-------O--------O-------O--------O
3386 * firstsnap lastsnap
3388 * This is the set of blocks that were born after the snap before firstsnap,
3389 * (birth > firstsnap->prev_snap_txg) and died before the snap after the
3390 * last snap (ie, is on lastsnap->ds_next->ds_deadlist or an earlier deadlist).
3391 * We calculate this by iterating over the relevant deadlists (from the snap
3392 * after lastsnap, backward to the snap after firstsnap), summing up the
3393 * space on the deadlist that was born after the snap before firstsnap.
3396 dsl_dataset_space_wouldfree(dsl_dataset_t
*firstsnap
,
3397 dsl_dataset_t
*lastsnap
,
3398 uint64_t *usedp
, uint64_t *compp
, uint64_t *uncompp
)
3402 dsl_pool_t
*dp
= firstsnap
->ds_dir
->dd_pool
;
3404 ASSERT(firstsnap
->ds_is_snapshot
);
3405 ASSERT(lastsnap
->ds_is_snapshot
);
3408 * Check that the snapshots are in the same dsl_dir, and firstsnap
3409 * is before lastsnap.
3411 if (firstsnap
->ds_dir
!= lastsnap
->ds_dir
||
3412 dsl_dataset_phys(firstsnap
)->ds_creation_txg
>
3413 dsl_dataset_phys(lastsnap
)->ds_creation_txg
)
3414 return (SET_ERROR(EINVAL
));
3416 *usedp
= *compp
= *uncompp
= 0;
3418 snapobj
= dsl_dataset_phys(lastsnap
)->ds_next_snap_obj
;
3419 while (snapobj
!= firstsnap
->ds_object
) {
3421 uint64_t used
, comp
, uncomp
;
3423 err
= dsl_dataset_hold_obj(dp
, snapobj
, FTAG
, &ds
);
3427 dsl_deadlist_space_range(&ds
->ds_deadlist
,
3428 dsl_dataset_phys(firstsnap
)->ds_prev_snap_txg
, UINT64_MAX
,
3429 &used
, &comp
, &uncomp
);
3434 snapobj
= dsl_dataset_phys(ds
)->ds_prev_snap_obj
;
3435 ASSERT3U(snapobj
, !=, 0);
3436 dsl_dataset_rele(ds
, FTAG
);
3442 * Return TRUE if 'earlier' is an earlier snapshot in 'later's timeline.
3443 * For example, they could both be snapshots of the same filesystem, and
3444 * 'earlier' is before 'later'. Or 'earlier' could be the origin of
3445 * 'later's filesystem. Or 'earlier' could be an older snapshot in the origin's
3446 * filesystem. Or 'earlier' could be the origin's origin.
3448 * If non-zero, earlier_txg is used instead of earlier's ds_creation_txg.
3451 dsl_dataset_is_before(dsl_dataset_t
*later
, dsl_dataset_t
*earlier
,
3452 uint64_t earlier_txg
)
3454 dsl_pool_t
*dp
= later
->ds_dir
->dd_pool
;
3458 ASSERT(dsl_pool_config_held(dp
));
3459 ASSERT(earlier
->ds_is_snapshot
|| earlier_txg
!= 0);
3461 if (earlier_txg
== 0)
3462 earlier_txg
= dsl_dataset_phys(earlier
)->ds_creation_txg
;
3464 if (later
->ds_is_snapshot
&&
3465 earlier_txg
>= dsl_dataset_phys(later
)->ds_creation_txg
)
3468 if (later
->ds_dir
== earlier
->ds_dir
)
3470 if (!dsl_dir_is_clone(later
->ds_dir
))
3473 if (dsl_dir_phys(later
->ds_dir
)->dd_origin_obj
== earlier
->ds_object
)
3475 dsl_dataset_t
*origin
;
3476 error
= dsl_dataset_hold_obj(dp
,
3477 dsl_dir_phys(later
->ds_dir
)->dd_origin_obj
, FTAG
, &origin
);
3480 ret
= dsl_dataset_is_before(origin
, earlier
, earlier_txg
);
3481 dsl_dataset_rele(origin
, FTAG
);
3486 dsl_dataset_zapify(dsl_dataset_t
*ds
, dmu_tx_t
*tx
)
3488 objset_t
*mos
= ds
->ds_dir
->dd_pool
->dp_meta_objset
;
3489 dmu_object_zapify(mos
, ds
->ds_object
, DMU_OT_DSL_DATASET
, tx
);
3493 dsl_dataset_is_zapified(dsl_dataset_t
*ds
)
3495 dmu_object_info_t doi
;
3497 dmu_object_info_from_db(ds
->ds_dbuf
, &doi
);
3498 return (doi
.doi_type
== DMU_OTN_ZAP_METADATA
);
3502 dsl_dataset_has_resume_receive_state(dsl_dataset_t
*ds
)
3504 return (dsl_dataset_is_zapified(ds
) &&
3505 zap_contains(ds
->ds_dir
->dd_pool
->dp_meta_objset
,
3506 ds
->ds_object
, DS_FIELD_RESUME_TOGUID
) == 0);