4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
23 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Copyright (c) 2011, 2017 by Delphix. All rights reserved.
25 * Copyright (c) 2014, Joyent, Inc. All rights reserved.
26 * Copyright (c) 2014 RackTop Systems.
27 * Copyright (c) 2014 Spectra Logic Corporation, All rights reserved.
28 * Copyright (c) 2014 Integros [integros.com]
29 * Copyright 2016, OmniTI Computer Consulting, Inc. All rights reserved.
30 * Copyright 2017 Nexenta Systems, Inc.
33 #include <sys/dmu_objset.h>
34 #include <sys/dsl_dataset.h>
35 #include <sys/dsl_dir.h>
36 #include <sys/dsl_prop.h>
37 #include <sys/dsl_synctask.h>
38 #include <sys/dmu_traverse.h>
39 #include <sys/dmu_impl.h>
40 #include <sys/dmu_tx.h>
44 #include <sys/zfeature.h>
45 #include <sys/unique.h>
46 #include <sys/zfs_context.h>
47 #include <sys/zfs_ioctl.h>
49 #include <sys/spa_impl.h>
51 #include <sys/zfs_znode.h>
52 #include <sys/zfs_onexit.h>
54 #include <sys/dsl_scan.h>
55 #include <sys/dsl_deadlist.h>
56 #include <sys/dsl_destroy.h>
57 #include <sys/dsl_userhold.h>
58 #include <sys/dsl_bookmark.h>
59 #include <sys/dmu_recv.h>
60 #include <sys/zio_checksum.h>
61 #include <sys/zio_compress.h>
62 #include <zfs_fletcher.h>
65 * The SPA supports block sizes up to 16MB. However, very large blocks
66 * can have an impact on i/o latency (e.g. tying up a spinning disk for
67 * ~300ms), and also potentially on the memory allocator. Therefore,
68 * we do not allow the recordsize to be set larger than zfs_max_recordsize
69 * (default 1MB). Larger blocks can be created by changing this tunable,
70 * and pools with larger blocks can always be imported and used, regardless
73 int zfs_max_recordsize
= 1 * 1024 * 1024;
75 #define SWITCH64(x, y) \
77 uint64_t __tmp = (x); \
82 #define DS_REF_MAX (1ULL << 62)
84 extern inline dsl_dataset_phys_t
*dsl_dataset_phys(dsl_dataset_t
*ds
);
86 static void dsl_dataset_set_remap_deadlist_object(dsl_dataset_t
*ds
,
87 uint64_t obj
, dmu_tx_t
*tx
);
88 static void dsl_dataset_unset_remap_deadlist_object(dsl_dataset_t
*ds
,
91 extern int spa_asize_inflation
;
93 static zil_header_t zero_zil
;
96 * Figure out how much of this delta should be propogated to the dsl_dir
97 * layer. If there's a refreservation, that space has already been
98 * partially accounted for in our ancestors.
101 parent_delta(dsl_dataset_t
*ds
, int64_t delta
)
103 dsl_dataset_phys_t
*ds_phys
;
104 uint64_t old_bytes
, new_bytes
;
106 if (ds
->ds_reserved
== 0)
109 ds_phys
= dsl_dataset_phys(ds
);
110 old_bytes
= MAX(ds_phys
->ds_unique_bytes
, ds
->ds_reserved
);
111 new_bytes
= MAX(ds_phys
->ds_unique_bytes
+ delta
, ds
->ds_reserved
);
113 ASSERT3U(ABS((int64_t)(new_bytes
- old_bytes
)), <=, ABS(delta
));
114 return (new_bytes
- old_bytes
);
118 dsl_dataset_block_born(dsl_dataset_t
*ds
, const blkptr_t
*bp
, dmu_tx_t
*tx
)
120 int used
= bp_get_dsize_sync(tx
->tx_pool
->dp_spa
, bp
);
121 int compressed
= BP_GET_PSIZE(bp
);
122 int uncompressed
= BP_GET_UCSIZE(bp
);
125 dprintf_bp(bp
, "ds=%p", ds
);
127 ASSERT(dmu_tx_is_syncing(tx
));
128 /* It could have been compressed away to nothing */
131 ASSERT(BP_GET_TYPE(bp
) != DMU_OT_NONE
);
132 ASSERT(DMU_OT_IS_VALID(BP_GET_TYPE(bp
)));
134 dsl_pool_mos_diduse_space(tx
->tx_pool
,
135 used
, compressed
, uncompressed
);
139 ASSERT3U(bp
->blk_birth
, >, dsl_dataset_phys(ds
)->ds_prev_snap_txg
);
140 dmu_buf_will_dirty(ds
->ds_dbuf
, tx
);
141 mutex_enter(&ds
->ds_lock
);
142 delta
= parent_delta(ds
, used
);
143 dsl_dataset_phys(ds
)->ds_referenced_bytes
+= used
;
144 dsl_dataset_phys(ds
)->ds_compressed_bytes
+= compressed
;
145 dsl_dataset_phys(ds
)->ds_uncompressed_bytes
+= uncompressed
;
146 dsl_dataset_phys(ds
)->ds_unique_bytes
+= used
;
148 if (BP_GET_LSIZE(bp
) > SPA_OLD_MAXBLOCKSIZE
) {
149 ds
->ds_feature_activation_needed
[SPA_FEATURE_LARGE_BLOCKS
] =
153 spa_feature_t f
= zio_checksum_to_feature(BP_GET_CHECKSUM(bp
));
154 if (f
!= SPA_FEATURE_NONE
)
155 ds
->ds_feature_activation_needed
[f
] = B_TRUE
;
157 mutex_exit(&ds
->ds_lock
);
158 dsl_dir_diduse_space(ds
->ds_dir
, DD_USED_HEAD
, delta
,
159 compressed
, uncompressed
, tx
);
160 dsl_dir_transfer_space(ds
->ds_dir
, used
- delta
,
161 DD_USED_REFRSRV
, DD_USED_HEAD
, tx
);
165 * Called when the specified segment has been remapped, and is thus no
166 * longer referenced in the head dataset. The vdev must be indirect.
168 * If the segment is referenced by a snapshot, put it on the remap deadlist.
169 * Otherwise, add this segment to the obsolete spacemap.
172 dsl_dataset_block_remapped(dsl_dataset_t
*ds
, uint64_t vdev
, uint64_t offset
,
173 uint64_t size
, uint64_t birth
, dmu_tx_t
*tx
)
175 spa_t
*spa
= ds
->ds_dir
->dd_pool
->dp_spa
;
177 ASSERT(dmu_tx_is_syncing(tx
));
178 ASSERT(birth
<= tx
->tx_txg
);
179 ASSERT(!ds
->ds_is_snapshot
);
181 if (birth
> dsl_dataset_phys(ds
)->ds_prev_snap_txg
) {
182 spa_vdev_indirect_mark_obsolete(spa
, vdev
, offset
, size
, tx
);
185 dva_t
*dva
= &fakebp
.blk_dva
[0];
189 mutex_enter(&ds
->ds_remap_deadlist_lock
);
190 if (!dsl_dataset_remap_deadlist_exists(ds
)) {
191 dsl_dataset_create_remap_deadlist(ds
, tx
);
193 mutex_exit(&ds
->ds_remap_deadlist_lock
);
196 fakebp
.blk_birth
= birth
;
197 DVA_SET_VDEV(dva
, vdev
);
198 DVA_SET_OFFSET(dva
, offset
);
199 DVA_SET_ASIZE(dva
, size
);
201 dsl_deadlist_insert(&ds
->ds_remap_deadlist
, &fakebp
, tx
);
206 dsl_dataset_block_kill(dsl_dataset_t
*ds
, const blkptr_t
*bp
, dmu_tx_t
*tx
,
209 spa_t
*spa
= dmu_tx_pool(tx
)->dp_spa
;
211 int used
= bp_get_dsize_sync(spa
, bp
);
212 int compressed
= BP_GET_PSIZE(bp
);
213 int uncompressed
= BP_GET_UCSIZE(bp
);
218 ASSERT(dmu_tx_is_syncing(tx
));
219 ASSERT(bp
->blk_birth
<= tx
->tx_txg
);
222 dsl_free(tx
->tx_pool
, tx
->tx_txg
, bp
);
223 dsl_pool_mos_diduse_space(tx
->tx_pool
,
224 -used
, -compressed
, -uncompressed
);
227 ASSERT3P(tx
->tx_pool
, ==, ds
->ds_dir
->dd_pool
);
229 ASSERT(!ds
->ds_is_snapshot
);
230 dmu_buf_will_dirty(ds
->ds_dbuf
, tx
);
232 if (bp
->blk_birth
> dsl_dataset_phys(ds
)->ds_prev_snap_txg
) {
235 dprintf_bp(bp
, "freeing ds=%llu", ds
->ds_object
);
236 dsl_free(tx
->tx_pool
, tx
->tx_txg
, bp
);
238 mutex_enter(&ds
->ds_lock
);
239 ASSERT(dsl_dataset_phys(ds
)->ds_unique_bytes
>= used
||
240 !DS_UNIQUE_IS_ACCURATE(ds
));
241 delta
= parent_delta(ds
, -used
);
242 dsl_dataset_phys(ds
)->ds_unique_bytes
-= used
;
243 mutex_exit(&ds
->ds_lock
);
244 dsl_dir_diduse_space(ds
->ds_dir
, DD_USED_HEAD
,
245 delta
, -compressed
, -uncompressed
, tx
);
246 dsl_dir_transfer_space(ds
->ds_dir
, -used
- delta
,
247 DD_USED_REFRSRV
, DD_USED_HEAD
, tx
);
249 dprintf_bp(bp
, "putting on dead list: %s", "");
252 * We are here as part of zio's write done callback,
253 * which means we're a zio interrupt thread. We can't
254 * call dsl_deadlist_insert() now because it may block
255 * waiting for I/O. Instead, put bp on the deferred
256 * queue and let dsl_pool_sync() finish the job.
258 bplist_append(&ds
->ds_pending_deadlist
, bp
);
260 dsl_deadlist_insert(&ds
->ds_deadlist
, bp
, tx
);
262 ASSERT3U(ds
->ds_prev
->ds_object
, ==,
263 dsl_dataset_phys(ds
)->ds_prev_snap_obj
);
264 ASSERT(dsl_dataset_phys(ds
->ds_prev
)->ds_num_children
> 0);
265 /* if (bp->blk_birth > prev prev snap txg) prev unique += bs */
266 if (dsl_dataset_phys(ds
->ds_prev
)->ds_next_snap_obj
==
267 ds
->ds_object
&& bp
->blk_birth
>
268 dsl_dataset_phys(ds
->ds_prev
)->ds_prev_snap_txg
) {
269 dmu_buf_will_dirty(ds
->ds_prev
->ds_dbuf
, tx
);
270 mutex_enter(&ds
->ds_prev
->ds_lock
);
271 dsl_dataset_phys(ds
->ds_prev
)->ds_unique_bytes
+= used
;
272 mutex_exit(&ds
->ds_prev
->ds_lock
);
274 if (bp
->blk_birth
> ds
->ds_dir
->dd_origin_txg
) {
275 dsl_dir_transfer_space(ds
->ds_dir
, used
,
276 DD_USED_HEAD
, DD_USED_SNAP
, tx
);
279 mutex_enter(&ds
->ds_lock
);
280 ASSERT3U(dsl_dataset_phys(ds
)->ds_referenced_bytes
, >=, used
);
281 dsl_dataset_phys(ds
)->ds_referenced_bytes
-= used
;
282 ASSERT3U(dsl_dataset_phys(ds
)->ds_compressed_bytes
, >=, compressed
);
283 dsl_dataset_phys(ds
)->ds_compressed_bytes
-= compressed
;
284 ASSERT3U(dsl_dataset_phys(ds
)->ds_uncompressed_bytes
, >=, uncompressed
);
285 dsl_dataset_phys(ds
)->ds_uncompressed_bytes
-= uncompressed
;
286 mutex_exit(&ds
->ds_lock
);
292 * We have to release the fsid syncronously or we risk that a subsequent
293 * mount of the same dataset will fail to unique_insert the fsid. This
294 * failure would manifest itself as the fsid of this dataset changing
295 * between mounts which makes NFS clients quite unhappy.
298 dsl_dataset_evict_sync(void *dbu
)
300 dsl_dataset_t
*ds
= dbu
;
302 ASSERT(ds
->ds_owner
== NULL
);
304 unique_remove(ds
->ds_fsid_guid
);
308 dsl_dataset_evict_async(void *dbu
)
310 dsl_dataset_t
*ds
= dbu
;
312 ASSERT(ds
->ds_owner
== NULL
);
316 if (ds
->ds_objset
!= NULL
)
317 dmu_objset_evict(ds
->ds_objset
);
320 dsl_dataset_rele(ds
->ds_prev
, ds
);
324 bplist_destroy(&ds
->ds_pending_deadlist
);
325 if (dsl_deadlist_is_open(&ds
->ds_deadlist
))
326 dsl_deadlist_close(&ds
->ds_deadlist
);
327 if (dsl_deadlist_is_open(&ds
->ds_remap_deadlist
))
328 dsl_deadlist_close(&ds
->ds_remap_deadlist
);
330 dsl_dir_async_rele(ds
->ds_dir
, ds
);
332 ASSERT(!list_link_active(&ds
->ds_synced_link
));
334 list_destroy(&ds
->ds_prop_cbs
);
335 mutex_destroy(&ds
->ds_lock
);
336 mutex_destroy(&ds
->ds_opening_lock
);
337 mutex_destroy(&ds
->ds_sendstream_lock
);
338 mutex_destroy(&ds
->ds_remap_deadlist_lock
);
339 zfs_refcount_destroy(&ds
->ds_longholds
);
340 rrw_destroy(&ds
->ds_bp_rwlock
);
342 kmem_free(ds
, sizeof (dsl_dataset_t
));
346 dsl_dataset_get_snapname(dsl_dataset_t
*ds
)
348 dsl_dataset_phys_t
*headphys
;
351 dsl_pool_t
*dp
= ds
->ds_dir
->dd_pool
;
352 objset_t
*mos
= dp
->dp_meta_objset
;
354 if (ds
->ds_snapname
[0])
356 if (dsl_dataset_phys(ds
)->ds_next_snap_obj
== 0)
359 err
= dmu_bonus_hold(mos
, dsl_dir_phys(ds
->ds_dir
)->dd_head_dataset_obj
,
363 headphys
= headdbuf
->db_data
;
364 err
= zap_value_search(dp
->dp_meta_objset
,
365 headphys
->ds_snapnames_zapobj
, ds
->ds_object
, 0, ds
->ds_snapname
);
366 dmu_buf_rele(headdbuf
, FTAG
);
371 dsl_dataset_snap_lookup(dsl_dataset_t
*ds
, const char *name
, uint64_t *value
)
373 objset_t
*mos
= ds
->ds_dir
->dd_pool
->dp_meta_objset
;
374 uint64_t snapobj
= dsl_dataset_phys(ds
)->ds_snapnames_zapobj
;
378 if (dsl_dataset_phys(ds
)->ds_flags
& DS_FLAG_CI_DATASET
)
381 err
= zap_lookup_norm(mos
, snapobj
, name
, 8, 1,
382 value
, mt
, NULL
, 0, NULL
);
383 if (err
== ENOTSUP
&& (mt
& MT_NORMALIZE
))
384 err
= zap_lookup(mos
, snapobj
, name
, 8, 1, value
);
389 dsl_dataset_snap_remove(dsl_dataset_t
*ds
, const char *name
, dmu_tx_t
*tx
,
392 objset_t
*mos
= ds
->ds_dir
->dd_pool
->dp_meta_objset
;
393 uint64_t snapobj
= dsl_dataset_phys(ds
)->ds_snapnames_zapobj
;
397 dsl_dir_snap_cmtime_update(ds
->ds_dir
);
399 if (dsl_dataset_phys(ds
)->ds_flags
& DS_FLAG_CI_DATASET
)
402 err
= zap_remove_norm(mos
, snapobj
, name
, mt
, tx
);
403 if (err
== ENOTSUP
&& (mt
& MT_NORMALIZE
))
404 err
= zap_remove(mos
, snapobj
, name
, tx
);
406 if (err
== 0 && adj_cnt
)
407 dsl_fs_ss_count_adjust(ds
->ds_dir
, -1,
408 DD_FIELD_SNAPSHOT_COUNT
, tx
);
414 dsl_dataset_try_add_ref(dsl_pool_t
*dp
, dsl_dataset_t
*ds
, void *tag
)
416 dmu_buf_t
*dbuf
= ds
->ds_dbuf
;
417 boolean_t result
= B_FALSE
;
419 if (dbuf
!= NULL
&& dmu_buf_try_add_ref(dbuf
, dp
->dp_meta_objset
,
420 ds
->ds_object
, DMU_BONUS_BLKID
, tag
)) {
422 if (ds
== dmu_buf_get_user(dbuf
))
425 dmu_buf_rele(dbuf
, tag
);
432 dsl_dataset_hold_obj(dsl_pool_t
*dp
, uint64_t dsobj
, void *tag
,
435 objset_t
*mos
= dp
->dp_meta_objset
;
439 dmu_object_info_t doi
;
441 ASSERT(dsl_pool_config_held(dp
));
443 err
= dmu_bonus_hold(mos
, dsobj
, tag
, &dbuf
);
447 /* Make sure dsobj has the correct object type. */
448 dmu_object_info_from_db(dbuf
, &doi
);
449 if (doi
.doi_bonus_type
!= DMU_OT_DSL_DATASET
) {
450 dmu_buf_rele(dbuf
, tag
);
451 return (SET_ERROR(EINVAL
));
454 ds
= dmu_buf_get_user(dbuf
);
456 dsl_dataset_t
*winner
= NULL
;
458 ds
= kmem_zalloc(sizeof (dsl_dataset_t
), KM_SLEEP
);
460 ds
->ds_object
= dsobj
;
461 ds
->ds_is_snapshot
= dsl_dataset_phys(ds
)->ds_num_children
!= 0;
463 err
= dsl_dir_hold_obj(dp
, dsl_dataset_phys(ds
)->ds_dir_obj
,
464 NULL
, ds
, &ds
->ds_dir
);
466 kmem_free(ds
, sizeof (dsl_dataset_t
));
467 dmu_buf_rele(dbuf
, tag
);
471 mutex_init(&ds
->ds_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
472 mutex_init(&ds
->ds_opening_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
473 mutex_init(&ds
->ds_sendstream_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
474 mutex_init(&ds
->ds_remap_deadlist_lock
,
475 NULL
, MUTEX_DEFAULT
, NULL
);
476 rrw_init(&ds
->ds_bp_rwlock
, B_FALSE
);
477 zfs_refcount_create(&ds
->ds_longholds
);
479 bplist_create(&ds
->ds_pending_deadlist
);
481 list_create(&ds
->ds_sendstreams
, sizeof (dmu_sendarg_t
),
482 offsetof(dmu_sendarg_t
, dsa_link
));
484 list_create(&ds
->ds_prop_cbs
, sizeof (dsl_prop_cb_record_t
),
485 offsetof(dsl_prop_cb_record_t
, cbr_ds_node
));
487 if (doi
.doi_type
== DMU_OTN_ZAP_METADATA
) {
488 for (spa_feature_t f
= 0; f
< SPA_FEATURES
; f
++) {
489 if (!(spa_feature_table
[f
].fi_flags
&
490 ZFEATURE_FLAG_PER_DATASET
))
492 err
= zap_contains(mos
, dsobj
,
493 spa_feature_table
[f
].fi_guid
);
495 ds
->ds_feature_inuse
[f
] = B_TRUE
;
497 ASSERT3U(err
, ==, ENOENT
);
503 if (!ds
->ds_is_snapshot
) {
504 ds
->ds_snapname
[0] = '\0';
505 if (dsl_dataset_phys(ds
)->ds_prev_snap_obj
!= 0) {
506 err
= dsl_dataset_hold_obj(dp
,
507 dsl_dataset_phys(ds
)->ds_prev_snap_obj
,
510 if (doi
.doi_type
== DMU_OTN_ZAP_METADATA
) {
511 int zaperr
= zap_lookup(mos
, ds
->ds_object
,
512 DS_FIELD_BOOKMARK_NAMES
,
513 sizeof (ds
->ds_bookmarks
), 1,
515 if (zaperr
!= ENOENT
)
519 if (zfs_flags
& ZFS_DEBUG_SNAPNAMES
)
520 err
= dsl_dataset_get_snapname(ds
);
522 dsl_dataset_phys(ds
)->ds_userrefs_obj
!= 0) {
524 ds
->ds_dir
->dd_pool
->dp_meta_objset
,
525 dsl_dataset_phys(ds
)->ds_userrefs_obj
,
530 if (err
== 0 && !ds
->ds_is_snapshot
) {
531 err
= dsl_prop_get_int_ds(ds
,
532 zfs_prop_to_name(ZFS_PROP_REFRESERVATION
),
535 err
= dsl_prop_get_int_ds(ds
,
536 zfs_prop_to_name(ZFS_PROP_REFQUOTA
),
540 ds
->ds_reserved
= ds
->ds_quota
= 0;
543 if (err
== 0 && ds
->ds_dir
->dd_crypto_obj
!= 0 &&
544 ds
->ds_is_snapshot
&&
545 zap_contains(mos
, dsobj
, DS_FIELD_IVSET_GUID
) != 0) {
546 dp
->dp_spa
->spa_errata
=
547 ZPOOL_ERRATA_ZOL_8308_ENCRYPTION
;
550 dsl_deadlist_open(&ds
->ds_deadlist
,
551 mos
, dsl_dataset_phys(ds
)->ds_deadlist_obj
);
552 uint64_t remap_deadlist_obj
=
553 dsl_dataset_get_remap_deadlist_object(ds
);
554 if (remap_deadlist_obj
!= 0) {
555 dsl_deadlist_open(&ds
->ds_remap_deadlist
, mos
,
559 dmu_buf_init_user(&ds
->ds_dbu
, dsl_dataset_evict_sync
,
560 dsl_dataset_evict_async
, &ds
->ds_dbuf
);
562 winner
= dmu_buf_set_user_ie(dbuf
, &ds
->ds_dbu
);
564 if (err
!= 0 || winner
!= NULL
) {
565 bplist_destroy(&ds
->ds_pending_deadlist
);
566 dsl_deadlist_close(&ds
->ds_deadlist
);
567 if (dsl_deadlist_is_open(&ds
->ds_remap_deadlist
))
568 dsl_deadlist_close(&ds
->ds_remap_deadlist
);
570 dsl_dataset_rele(ds
->ds_prev
, ds
);
571 dsl_dir_rele(ds
->ds_dir
, ds
);
572 list_destroy(&ds
->ds_prop_cbs
);
573 list_destroy(&ds
->ds_sendstreams
);
574 mutex_destroy(&ds
->ds_lock
);
575 mutex_destroy(&ds
->ds_opening_lock
);
576 mutex_destroy(&ds
->ds_sendstream_lock
);
577 mutex_destroy(&ds
->ds_remap_deadlist_lock
);
578 zfs_refcount_destroy(&ds
->ds_longholds
);
579 rrw_destroy(&ds
->ds_bp_rwlock
);
580 kmem_free(ds
, sizeof (dsl_dataset_t
));
582 dmu_buf_rele(dbuf
, tag
);
588 unique_insert(dsl_dataset_phys(ds
)->ds_fsid_guid
);
589 if (ds
->ds_fsid_guid
!=
590 dsl_dataset_phys(ds
)->ds_fsid_guid
) {
591 zfs_dbgmsg("ds_fsid_guid changed from "
592 "%llx to %llx for pool %s dataset id %llu",
594 dsl_dataset_phys(ds
)->ds_fsid_guid
,
595 (long long)ds
->ds_fsid_guid
,
596 spa_name(dp
->dp_spa
),
602 ASSERT3P(ds
->ds_dbuf
, ==, dbuf
);
603 ASSERT3P(dsl_dataset_phys(ds
), ==, dbuf
->db_data
);
604 ASSERT(dsl_dataset_phys(ds
)->ds_prev_snap_obj
!= 0 ||
605 spa_version(dp
->dp_spa
) < SPA_VERSION_ORIGIN
||
606 dp
->dp_origin_snap
== NULL
|| ds
== dp
->dp_origin_snap
);
613 dsl_dataset_create_key_mapping(dsl_dataset_t
*ds
)
615 dsl_dir_t
*dd
= ds
->ds_dir
;
617 if (dd
->dd_crypto_obj
== 0)
620 return (spa_keystore_create_mapping(dd
->dd_pool
->dp_spa
,
621 ds
, ds
, &ds
->ds_key_mapping
));
625 dsl_dataset_hold_obj_flags(dsl_pool_t
*dp
, uint64_t dsobj
,
626 ds_hold_flags_t flags
, void *tag
, dsl_dataset_t
**dsp
)
630 err
= dsl_dataset_hold_obj(dp
, dsobj
, tag
, dsp
);
634 ASSERT3P(*dsp
, !=, NULL
);
636 if (flags
& DS_HOLD_FLAG_DECRYPT
) {
637 err
= dsl_dataset_create_key_mapping(*dsp
);
639 dsl_dataset_rele(*dsp
, tag
);
646 dsl_dataset_hold_flags(dsl_pool_t
*dp
, const char *name
, ds_hold_flags_t flags
,
647 void *tag
, dsl_dataset_t
**dsp
)
650 const char *snapname
;
655 err
= dsl_dir_hold(dp
, name
, FTAG
, &dd
, &snapname
);
659 ASSERT(dsl_pool_config_held(dp
));
660 obj
= dsl_dir_phys(dd
)->dd_head_dataset_obj
;
662 err
= dsl_dataset_hold_obj_flags(dp
, obj
, flags
, tag
, &ds
);
664 err
= SET_ERROR(ENOENT
);
666 /* we may be looking for a snapshot */
667 if (err
== 0 && snapname
!= NULL
) {
668 dsl_dataset_t
*snap_ds
;
670 if (*snapname
++ != '@') {
671 dsl_dataset_rele_flags(ds
, flags
, tag
);
672 dsl_dir_rele(dd
, FTAG
);
673 return (SET_ERROR(ENOENT
));
676 dprintf("looking for snapshot '%s'\n", snapname
);
677 err
= dsl_dataset_snap_lookup(ds
, snapname
, &obj
);
679 err
= dsl_dataset_hold_obj_flags(dp
, obj
, flags
, tag
,
682 dsl_dataset_rele_flags(ds
, flags
, tag
);
685 mutex_enter(&snap_ds
->ds_lock
);
686 if (snap_ds
->ds_snapname
[0] == 0)
687 (void) strlcpy(snap_ds
->ds_snapname
, snapname
,
688 sizeof (snap_ds
->ds_snapname
));
689 mutex_exit(&snap_ds
->ds_lock
);
695 dsl_dir_rele(dd
, FTAG
);
700 dsl_dataset_hold(dsl_pool_t
*dp
, const char *name
, void *tag
,
703 return (dsl_dataset_hold_flags(dp
, name
, 0, tag
, dsp
));
707 dsl_dataset_own_obj(dsl_pool_t
*dp
, uint64_t dsobj
, ds_hold_flags_t flags
,
708 void *tag
, dsl_dataset_t
**dsp
)
710 int err
= dsl_dataset_hold_obj_flags(dp
, dsobj
, flags
, tag
, dsp
);
713 if (!dsl_dataset_tryown(*dsp
, tag
)) {
714 dsl_dataset_rele_flags(*dsp
, flags
, tag
);
716 return (SET_ERROR(EBUSY
));
722 dsl_dataset_own(dsl_pool_t
*dp
, const char *name
, ds_hold_flags_t flags
,
723 void *tag
, dsl_dataset_t
**dsp
)
725 int err
= dsl_dataset_hold_flags(dp
, name
, flags
, tag
, dsp
);
728 if (!dsl_dataset_tryown(*dsp
, tag
)) {
729 dsl_dataset_rele_flags(*dsp
, flags
, tag
);
730 return (SET_ERROR(EBUSY
));
736 * See the comment above dsl_pool_hold() for details. In summary, a long
737 * hold is used to prevent destruction of a dataset while the pool hold
738 * is dropped, allowing other concurrent operations (e.g. spa_sync()).
740 * The dataset and pool must be held when this function is called. After it
741 * is called, the pool hold may be released while the dataset is still held
745 dsl_dataset_long_hold(dsl_dataset_t
*ds
, void *tag
)
747 ASSERT(dsl_pool_config_held(ds
->ds_dir
->dd_pool
));
748 (void) zfs_refcount_add(&ds
->ds_longholds
, tag
);
752 dsl_dataset_long_rele(dsl_dataset_t
*ds
, void *tag
)
754 (void) zfs_refcount_remove(&ds
->ds_longholds
, tag
);
757 /* Return B_TRUE if there are any long holds on this dataset. */
759 dsl_dataset_long_held(dsl_dataset_t
*ds
)
761 return (!zfs_refcount_is_zero(&ds
->ds_longholds
));
765 dsl_dataset_name(dsl_dataset_t
*ds
, char *name
)
768 (void) strcpy(name
, "mos");
770 dsl_dir_name(ds
->ds_dir
, name
);
771 VERIFY0(dsl_dataset_get_snapname(ds
));
772 if (ds
->ds_snapname
[0]) {
773 VERIFY3U(strlcat(name
, "@", ZFS_MAX_DATASET_NAME_LEN
),
774 <, ZFS_MAX_DATASET_NAME_LEN
);
776 * We use a "recursive" mutex so that we
777 * can call dprintf_ds() with ds_lock held.
779 if (!MUTEX_HELD(&ds
->ds_lock
)) {
780 mutex_enter(&ds
->ds_lock
);
781 VERIFY3U(strlcat(name
, ds
->ds_snapname
,
782 ZFS_MAX_DATASET_NAME_LEN
), <,
783 ZFS_MAX_DATASET_NAME_LEN
);
784 mutex_exit(&ds
->ds_lock
);
786 VERIFY3U(strlcat(name
, ds
->ds_snapname
,
787 ZFS_MAX_DATASET_NAME_LEN
), <,
788 ZFS_MAX_DATASET_NAME_LEN
);
795 dsl_dataset_namelen(dsl_dataset_t
*ds
)
797 VERIFY0(dsl_dataset_get_snapname(ds
));
798 mutex_enter(&ds
->ds_lock
);
799 int len
= dsl_dir_namelen(ds
->ds_dir
) + 1 + strlen(ds
->ds_snapname
);
800 mutex_exit(&ds
->ds_lock
);
805 dsl_dataset_rele(dsl_dataset_t
*ds
, void *tag
)
807 dmu_buf_rele(ds
->ds_dbuf
, tag
);
811 dsl_dataset_remove_key_mapping(dsl_dataset_t
*ds
)
813 dsl_dir_t
*dd
= ds
->ds_dir
;
815 if (dd
== NULL
|| dd
->dd_crypto_obj
== 0)
818 (void) spa_keystore_remove_mapping(dd
->dd_pool
->dp_spa
,
823 dsl_dataset_rele_flags(dsl_dataset_t
*ds
, ds_hold_flags_t flags
, void *tag
)
825 if (flags
& DS_HOLD_FLAG_DECRYPT
)
826 dsl_dataset_remove_key_mapping(ds
);
828 dsl_dataset_rele(ds
, tag
);
832 dsl_dataset_disown(dsl_dataset_t
*ds
, ds_hold_flags_t flags
, void *tag
)
834 ASSERT3P(ds
->ds_owner
, ==, tag
);
835 ASSERT(ds
->ds_dbuf
!= NULL
);
837 mutex_enter(&ds
->ds_lock
);
839 mutex_exit(&ds
->ds_lock
);
840 dsl_dataset_long_rele(ds
, tag
);
841 dsl_dataset_rele_flags(ds
, flags
, tag
);
845 dsl_dataset_tryown(dsl_dataset_t
*ds
, void *tag
)
847 boolean_t gotit
= FALSE
;
849 ASSERT(dsl_pool_config_held(ds
->ds_dir
->dd_pool
));
850 mutex_enter(&ds
->ds_lock
);
851 if (ds
->ds_owner
== NULL
&& !DS_IS_INCONSISTENT(ds
)) {
853 dsl_dataset_long_hold(ds
, tag
);
856 mutex_exit(&ds
->ds_lock
);
861 dsl_dataset_has_owner(dsl_dataset_t
*ds
)
864 mutex_enter(&ds
->ds_lock
);
865 rv
= (ds
->ds_owner
!= NULL
);
866 mutex_exit(&ds
->ds_lock
);
871 dsl_dataset_activate_feature(uint64_t dsobj
, spa_feature_t f
, dmu_tx_t
*tx
)
873 spa_t
*spa
= dmu_tx_pool(tx
)->dp_spa
;
874 objset_t
*mos
= dmu_tx_pool(tx
)->dp_meta_objset
;
877 VERIFY(spa_feature_table
[f
].fi_flags
& ZFEATURE_FLAG_PER_DATASET
);
879 spa_feature_incr(spa
, f
, tx
);
880 dmu_object_zapify(mos
, dsobj
, DMU_OT_DSL_DATASET
, tx
);
882 VERIFY0(zap_add(mos
, dsobj
, spa_feature_table
[f
].fi_guid
,
883 sizeof (zero
), 1, &zero
, tx
));
887 dsl_dataset_deactivate_feature(uint64_t dsobj
, spa_feature_t f
, dmu_tx_t
*tx
)
889 spa_t
*spa
= dmu_tx_pool(tx
)->dp_spa
;
890 objset_t
*mos
= dmu_tx_pool(tx
)->dp_meta_objset
;
892 VERIFY(spa_feature_table
[f
].fi_flags
& ZFEATURE_FLAG_PER_DATASET
);
894 VERIFY0(zap_remove(mos
, dsobj
, spa_feature_table
[f
].fi_guid
, tx
));
895 spa_feature_decr(spa
, f
, tx
);
899 dsl_dataset_create_sync_dd(dsl_dir_t
*dd
, dsl_dataset_t
*origin
,
900 dsl_crypto_params_t
*dcp
, uint64_t flags
, dmu_tx_t
*tx
)
902 dsl_pool_t
*dp
= dd
->dd_pool
;
904 dsl_dataset_phys_t
*dsphys
;
906 objset_t
*mos
= dp
->dp_meta_objset
;
909 origin
= dp
->dp_origin_snap
;
911 ASSERT(origin
== NULL
|| origin
->ds_dir
->dd_pool
== dp
);
912 ASSERT(origin
== NULL
|| dsl_dataset_phys(origin
)->ds_num_children
> 0);
913 ASSERT(dmu_tx_is_syncing(tx
));
914 ASSERT(dsl_dir_phys(dd
)->dd_head_dataset_obj
== 0);
916 dsobj
= dmu_object_alloc(mos
, DMU_OT_DSL_DATASET
, 0,
917 DMU_OT_DSL_DATASET
, sizeof (dsl_dataset_phys_t
), tx
);
918 VERIFY0(dmu_bonus_hold(mos
, dsobj
, FTAG
, &dbuf
));
919 dmu_buf_will_dirty(dbuf
, tx
);
920 dsphys
= dbuf
->db_data
;
921 bzero(dsphys
, sizeof (dsl_dataset_phys_t
));
922 dsphys
->ds_dir_obj
= dd
->dd_object
;
923 dsphys
->ds_flags
= flags
;
924 dsphys
->ds_fsid_guid
= unique_create();
925 (void) random_get_pseudo_bytes((void*)&dsphys
->ds_guid
,
926 sizeof (dsphys
->ds_guid
));
927 dsphys
->ds_snapnames_zapobj
=
928 zap_create_norm(mos
, U8_TEXTPREP_TOUPPER
, DMU_OT_DSL_DS_SNAP_MAP
,
930 dsphys
->ds_creation_time
= gethrestime_sec();
931 dsphys
->ds_creation_txg
= tx
->tx_txg
== TXG_INITIAL
? 1 : tx
->tx_txg
;
933 if (origin
== NULL
) {
934 dsphys
->ds_deadlist_obj
= dsl_deadlist_alloc(mos
, tx
);
936 dsl_dataset_t
*ohds
; /* head of the origin snapshot */
938 dsphys
->ds_prev_snap_obj
= origin
->ds_object
;
939 dsphys
->ds_prev_snap_txg
=
940 dsl_dataset_phys(origin
)->ds_creation_txg
;
941 dsphys
->ds_referenced_bytes
=
942 dsl_dataset_phys(origin
)->ds_referenced_bytes
;
943 dsphys
->ds_compressed_bytes
=
944 dsl_dataset_phys(origin
)->ds_compressed_bytes
;
945 dsphys
->ds_uncompressed_bytes
=
946 dsl_dataset_phys(origin
)->ds_uncompressed_bytes
;
947 rrw_enter(&origin
->ds_bp_rwlock
, RW_READER
, FTAG
);
948 dsphys
->ds_bp
= dsl_dataset_phys(origin
)->ds_bp
;
949 rrw_exit(&origin
->ds_bp_rwlock
, FTAG
);
952 * Inherit flags that describe the dataset's contents
953 * (INCONSISTENT) or properties (Case Insensitive).
955 dsphys
->ds_flags
|= dsl_dataset_phys(origin
)->ds_flags
&
956 (DS_FLAG_INCONSISTENT
| DS_FLAG_CI_DATASET
);
958 for (spa_feature_t f
= 0; f
< SPA_FEATURES
; f
++) {
959 if (origin
->ds_feature_inuse
[f
])
960 dsl_dataset_activate_feature(dsobj
, f
, tx
);
963 dmu_buf_will_dirty(origin
->ds_dbuf
, tx
);
964 dsl_dataset_phys(origin
)->ds_num_children
++;
966 VERIFY0(dsl_dataset_hold_obj(dp
,
967 dsl_dir_phys(origin
->ds_dir
)->dd_head_dataset_obj
,
969 dsphys
->ds_deadlist_obj
= dsl_deadlist_clone(&ohds
->ds_deadlist
,
970 dsphys
->ds_prev_snap_txg
, dsphys
->ds_prev_snap_obj
, tx
);
971 dsl_dataset_rele(ohds
, FTAG
);
973 if (spa_version(dp
->dp_spa
) >= SPA_VERSION_NEXT_CLONES
) {
974 if (dsl_dataset_phys(origin
)->ds_next_clones_obj
== 0) {
975 dsl_dataset_phys(origin
)->ds_next_clones_obj
=
977 DMU_OT_NEXT_CLONES
, DMU_OT_NONE
, 0, tx
);
979 VERIFY0(zap_add_int(mos
,
980 dsl_dataset_phys(origin
)->ds_next_clones_obj
,
984 dmu_buf_will_dirty(dd
->dd_dbuf
, tx
);
985 dsl_dir_phys(dd
)->dd_origin_obj
= origin
->ds_object
;
986 if (spa_version(dp
->dp_spa
) >= SPA_VERSION_DIR_CLONES
) {
987 if (dsl_dir_phys(origin
->ds_dir
)->dd_clones
== 0) {
988 dmu_buf_will_dirty(origin
->ds_dir
->dd_dbuf
, tx
);
989 dsl_dir_phys(origin
->ds_dir
)->dd_clones
=
991 DMU_OT_DSL_CLONES
, DMU_OT_NONE
, 0, tx
);
993 VERIFY0(zap_add_int(mos
,
994 dsl_dir_phys(origin
->ds_dir
)->dd_clones
,
999 /* handle encryption */
1000 dsl_dataset_create_crypt_sync(dsobj
, dd
, origin
, dcp
, tx
);
1002 if (spa_version(dp
->dp_spa
) >= SPA_VERSION_UNIQUE_ACCURATE
)
1003 dsphys
->ds_flags
|= DS_FLAG_UNIQUE_ACCURATE
;
1005 dmu_buf_rele(dbuf
, FTAG
);
1007 dmu_buf_will_dirty(dd
->dd_dbuf
, tx
);
1008 dsl_dir_phys(dd
)->dd_head_dataset_obj
= dsobj
;
1014 dsl_dataset_zero_zil(dsl_dataset_t
*ds
, dmu_tx_t
*tx
)
1018 VERIFY0(dmu_objset_from_ds(ds
, &os
));
1019 if (bcmp(&os
->os_zil_header
, &zero_zil
, sizeof (zero_zil
)) != 0) {
1020 dsl_pool_t
*dp
= ds
->ds_dir
->dd_pool
;
1023 bzero(&os
->os_zil_header
, sizeof (os
->os_zil_header
));
1024 if (os
->os_encrypted
)
1025 os
->os_next_write_raw
[tx
->tx_txg
& TXG_MASK
] = B_TRUE
;
1027 zio
= zio_root(dp
->dp_spa
, NULL
, NULL
, ZIO_FLAG_MUSTSUCCEED
);
1028 dsl_dataset_sync(ds
, zio
, tx
);
1029 VERIFY0(zio_wait(zio
));
1031 /* dsl_dataset_sync_done will drop this reference. */
1032 dmu_buf_add_ref(ds
->ds_dbuf
, ds
);
1033 dsl_dataset_sync_done(ds
, tx
);
1038 dsl_dataset_create_sync(dsl_dir_t
*pdd
, const char *lastname
,
1039 dsl_dataset_t
*origin
, uint64_t flags
, cred_t
*cr
,
1040 dsl_crypto_params_t
*dcp
, dmu_tx_t
*tx
)
1042 dsl_pool_t
*dp
= pdd
->dd_pool
;
1043 uint64_t dsobj
, ddobj
;
1046 ASSERT(dmu_tx_is_syncing(tx
));
1047 ASSERT(lastname
[0] != '@');
1049 ddobj
= dsl_dir_create_sync(dp
, pdd
, lastname
, tx
);
1050 VERIFY0(dsl_dir_hold_obj(dp
, ddobj
, lastname
, FTAG
, &dd
));
1052 dsobj
= dsl_dataset_create_sync_dd(dd
, origin
, dcp
,
1053 flags
& ~DS_CREATE_FLAG_NODIRTY
, tx
);
1055 dsl_deleg_set_create_perms(dd
, tx
, cr
);
1058 * Since we're creating a new node we know it's a leaf, so we can
1059 * initialize the counts if the limit feature is active.
1061 if (spa_feature_is_active(dp
->dp_spa
, SPA_FEATURE_FS_SS_LIMIT
)) {
1063 objset_t
*os
= dd
->dd_pool
->dp_meta_objset
;
1065 dsl_dir_zapify(dd
, tx
);
1066 VERIFY0(zap_add(os
, dd
->dd_object
, DD_FIELD_FILESYSTEM_COUNT
,
1067 sizeof (cnt
), 1, &cnt
, tx
));
1068 VERIFY0(zap_add(os
, dd
->dd_object
, DD_FIELD_SNAPSHOT_COUNT
,
1069 sizeof (cnt
), 1, &cnt
, tx
));
1072 dsl_dir_rele(dd
, FTAG
);
1075 * If we are creating a clone, make sure we zero out any stale
1076 * data from the origin snapshots zil header.
1078 if (origin
!= NULL
&& !(flags
& DS_CREATE_FLAG_NODIRTY
)) {
1081 VERIFY0(dsl_dataset_hold_obj(dp
, dsobj
, FTAG
, &ds
));
1082 dsl_dataset_zero_zil(ds
, tx
);
1083 dsl_dataset_rele(ds
, FTAG
);
1090 * The unique space in the head dataset can be calculated by subtracting
1091 * the space used in the most recent snapshot, that is still being used
1092 * in this file system, from the space currently in use. To figure out
1093 * the space in the most recent snapshot still in use, we need to take
1094 * the total space used in the snapshot and subtract out the space that
1095 * has been freed up since the snapshot was taken.
1098 dsl_dataset_recalc_head_uniq(dsl_dataset_t
*ds
)
1101 uint64_t dlused
, dlcomp
, dluncomp
;
1103 ASSERT(!ds
->ds_is_snapshot
);
1105 if (dsl_dataset_phys(ds
)->ds_prev_snap_obj
!= 0)
1106 mrs_used
= dsl_dataset_phys(ds
->ds_prev
)->ds_referenced_bytes
;
1110 dsl_deadlist_space(&ds
->ds_deadlist
, &dlused
, &dlcomp
, &dluncomp
);
1112 ASSERT3U(dlused
, <=, mrs_used
);
1113 dsl_dataset_phys(ds
)->ds_unique_bytes
=
1114 dsl_dataset_phys(ds
)->ds_referenced_bytes
- (mrs_used
- dlused
);
1116 if (spa_version(ds
->ds_dir
->dd_pool
->dp_spa
) >=
1117 SPA_VERSION_UNIQUE_ACCURATE
)
1118 dsl_dataset_phys(ds
)->ds_flags
|= DS_FLAG_UNIQUE_ACCURATE
;
1122 dsl_dataset_remove_from_next_clones(dsl_dataset_t
*ds
, uint64_t obj
,
1125 objset_t
*mos
= ds
->ds_dir
->dd_pool
->dp_meta_objset
;
1129 ASSERT(dsl_dataset_phys(ds
)->ds_num_children
>= 2);
1130 err
= zap_remove_int(mos
, dsl_dataset_phys(ds
)->ds_next_clones_obj
,
1133 * The err should not be ENOENT, but a bug in a previous version
1134 * of the code could cause upgrade_clones_cb() to not set
1135 * ds_next_snap_obj when it should, leading to a missing entry.
1136 * If we knew that the pool was created after
1137 * SPA_VERSION_NEXT_CLONES, we could assert that it isn't
1138 * ENOENT. However, at least we can check that we don't have
1139 * too many entries in the next_clones_obj even after failing to
1144 ASSERT0(zap_count(mos
, dsl_dataset_phys(ds
)->ds_next_clones_obj
,
1146 ASSERT3U(count
, <=, dsl_dataset_phys(ds
)->ds_num_children
- 2);
1151 dsl_dataset_get_blkptr(dsl_dataset_t
*ds
)
1153 return (&dsl_dataset_phys(ds
)->ds_bp
);
1157 dsl_dataset_get_spa(dsl_dataset_t
*ds
)
1159 return (ds
->ds_dir
->dd_pool
->dp_spa
);
1163 dsl_dataset_dirty(dsl_dataset_t
*ds
, dmu_tx_t
*tx
)
1167 if (ds
== NULL
) /* this is the meta-objset */
1170 ASSERT(ds
->ds_objset
!= NULL
);
1172 if (dsl_dataset_phys(ds
)->ds_next_snap_obj
!= 0)
1173 panic("dirtying snapshot!");
1175 /* Must not dirty a dataset in the same txg where it got snapshotted. */
1176 ASSERT3U(tx
->tx_txg
, >, dsl_dataset_phys(ds
)->ds_prev_snap_txg
);
1178 dp
= ds
->ds_dir
->dd_pool
;
1179 if (txg_list_add(&dp
->dp_dirty_datasets
, ds
, tx
->tx_txg
)) {
1180 objset_t
*os
= ds
->ds_objset
;
1182 /* up the hold count until we can be written out */
1183 dmu_buf_add_ref(ds
->ds_dbuf
, ds
);
1185 /* if this dataset is encrypted, grab a reference to the DCK */
1186 if (ds
->ds_dir
->dd_crypto_obj
!= 0 &&
1187 !os
->os_raw_receive
&&
1188 !os
->os_next_write_raw
[tx
->tx_txg
& TXG_MASK
]) {
1189 ASSERT3P(ds
->ds_key_mapping
, !=, NULL
);
1190 key_mapping_add_ref(ds
->ds_key_mapping
, ds
);
1196 dsl_dataset_is_dirty(dsl_dataset_t
*ds
)
1198 for (int t
= 0; t
< TXG_SIZE
; t
++) {
1199 if (txg_list_member(&ds
->ds_dir
->dd_pool
->dp_dirty_datasets
,
1207 dsl_dataset_snapshot_reserve_space(dsl_dataset_t
*ds
, dmu_tx_t
*tx
)
1211 if (!dmu_tx_is_syncing(tx
))
1215 * If there's an fs-only reservation, any blocks that might become
1216 * owned by the snapshot dataset must be accommodated by space
1217 * outside of the reservation.
1219 ASSERT(ds
->ds_reserved
== 0 || DS_UNIQUE_IS_ACCURATE(ds
));
1220 asize
= MIN(dsl_dataset_phys(ds
)->ds_unique_bytes
, ds
->ds_reserved
);
1221 if (asize
> dsl_dir_space_available(ds
->ds_dir
, NULL
, 0, TRUE
))
1222 return (SET_ERROR(ENOSPC
));
1225 * Propagate any reserved space for this snapshot to other
1226 * snapshot checks in this sync group.
1229 dsl_dir_willuse_space(ds
->ds_dir
, asize
, tx
);
1235 dsl_dataset_snapshot_check_impl(dsl_dataset_t
*ds
, const char *snapname
,
1236 dmu_tx_t
*tx
, boolean_t recv
, uint64_t cnt
, cred_t
*cr
)
1241 ds
->ds_trysnap_txg
= tx
->tx_txg
;
1243 if (!dmu_tx_is_syncing(tx
))
1247 * We don't allow multiple snapshots of the same txg. If there
1248 * is already one, try again.
1250 if (dsl_dataset_phys(ds
)->ds_prev_snap_txg
>= tx
->tx_txg
)
1251 return (SET_ERROR(EAGAIN
));
1254 * Check for conflicting snapshot name.
1256 error
= dsl_dataset_snap_lookup(ds
, snapname
, &value
);
1258 return (SET_ERROR(EEXIST
));
1259 if (error
!= ENOENT
)
1263 * We don't allow taking snapshots of inconsistent datasets, such as
1264 * those into which we are currently receiving. However, if we are
1265 * creating this snapshot as part of a receive, this check will be
1266 * executed atomically with respect to the completion of the receive
1267 * itself but prior to the clearing of DS_FLAG_INCONSISTENT; in this
1268 * case we ignore this, knowing it will be fixed up for us shortly in
1269 * dmu_recv_end_sync().
1271 if (!recv
&& DS_IS_INCONSISTENT(ds
))
1272 return (SET_ERROR(EBUSY
));
1275 * Skip the check for temporary snapshots or if we have already checked
1276 * the counts in dsl_dataset_snapshot_check. This means we really only
1277 * check the count here when we're receiving a stream.
1279 if (cnt
!= 0 && cr
!= NULL
) {
1280 error
= dsl_fs_ss_limit_check(ds
->ds_dir
, cnt
,
1281 ZFS_PROP_SNAPSHOT_LIMIT
, NULL
, cr
);
1286 error
= dsl_dataset_snapshot_reserve_space(ds
, tx
);
1294 dsl_dataset_snapshot_check(void *arg
, dmu_tx_t
*tx
)
1296 dsl_dataset_snapshot_arg_t
*ddsa
= arg
;
1297 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
1302 * Pre-compute how many total new snapshots will be created for each
1303 * level in the tree and below. This is needed for validating the
1304 * snapshot limit when either taking a recursive snapshot or when
1305 * taking multiple snapshots.
1307 * The problem is that the counts are not actually adjusted when
1308 * we are checking, only when we finally sync. For a single snapshot,
1309 * this is easy, the count will increase by 1 at each node up the tree,
1310 * but its more complicated for the recursive/multiple snapshot case.
1312 * The dsl_fs_ss_limit_check function does recursively check the count
1313 * at each level up the tree but since it is validating each snapshot
1314 * independently we need to be sure that we are validating the complete
1315 * count for the entire set of snapshots. We do this by rolling up the
1316 * counts for each component of the name into an nvlist and then
1317 * checking each of those cases with the aggregated count.
1319 * This approach properly handles not only the recursive snapshot
1320 * case (where we get all of those on the ddsa_snaps list) but also
1321 * the sibling case (e.g. snapshot a/b and a/c so that we will also
1322 * validate the limit on 'a' using a count of 2).
1324 * We validate the snapshot names in the third loop and only report
1327 if (dmu_tx_is_syncing(tx
)) {
1328 nvlist_t
*cnt_track
= NULL
;
1329 cnt_track
= fnvlist_alloc();
1331 /* Rollup aggregated counts into the cnt_track list */
1332 for (pair
= nvlist_next_nvpair(ddsa
->ddsa_snaps
, NULL
);
1334 pair
= nvlist_next_nvpair(ddsa
->ddsa_snaps
, pair
)) {
1337 char nm
[MAXPATHLEN
];
1339 (void) strlcpy(nm
, nvpair_name(pair
), sizeof (nm
));
1340 pdelim
= strchr(nm
, '@');
1346 if (nvlist_lookup_uint64(cnt_track
, nm
,
1348 /* update existing entry */
1349 fnvlist_add_uint64(cnt_track
, nm
,
1353 fnvlist_add_uint64(cnt_track
, nm
, 1);
1356 pdelim
= strrchr(nm
, '/');
1359 } while (pdelim
!= NULL
);
1362 /* Check aggregated counts at each level */
1363 for (pair
= nvlist_next_nvpair(cnt_track
, NULL
);
1364 pair
!= NULL
; pair
= nvlist_next_nvpair(cnt_track
, pair
)) {
1370 name
= nvpair_name(pair
);
1371 cnt
= fnvpair_value_uint64(pair
);
1374 error
= dsl_dataset_hold(dp
, name
, FTAG
, &ds
);
1376 error
= dsl_fs_ss_limit_check(ds
->ds_dir
, cnt
,
1377 ZFS_PROP_SNAPSHOT_LIMIT
, NULL
,
1379 dsl_dataset_rele(ds
, FTAG
);
1383 if (ddsa
->ddsa_errors
!= NULL
)
1384 fnvlist_add_int32(ddsa
->ddsa_errors
,
1387 /* only report one error for this check */
1391 nvlist_free(cnt_track
);
1394 for (pair
= nvlist_next_nvpair(ddsa
->ddsa_snaps
, NULL
);
1395 pair
!= NULL
; pair
= nvlist_next_nvpair(ddsa
->ddsa_snaps
, pair
)) {
1399 char dsname
[ZFS_MAX_DATASET_NAME_LEN
];
1401 name
= nvpair_name(pair
);
1402 if (strlen(name
) >= ZFS_MAX_DATASET_NAME_LEN
)
1403 error
= SET_ERROR(ENAMETOOLONG
);
1405 atp
= strchr(name
, '@');
1407 error
= SET_ERROR(EINVAL
);
1409 (void) strlcpy(dsname
, name
, atp
- name
+ 1);
1412 error
= dsl_dataset_hold(dp
, dsname
, FTAG
, &ds
);
1414 /* passing 0/NULL skips dsl_fs_ss_limit_check */
1415 error
= dsl_dataset_snapshot_check_impl(ds
,
1416 atp
+ 1, tx
, B_FALSE
, 0, NULL
);
1417 dsl_dataset_rele(ds
, FTAG
);
1421 if (ddsa
->ddsa_errors
!= NULL
) {
1422 fnvlist_add_int32(ddsa
->ddsa_errors
,
1433 dsl_dataset_snapshot_sync_impl(dsl_dataset_t
*ds
, const char *snapname
,
1436 dsl_pool_t
*dp
= ds
->ds_dir
->dd_pool
;
1438 dsl_dataset_phys_t
*dsphys
;
1439 uint64_t dsobj
, crtxg
;
1440 objset_t
*mos
= dp
->dp_meta_objset
;
1443 ASSERT(RRW_WRITE_HELD(&dp
->dp_config_rwlock
));
1446 * If we are on an old pool, the zil must not be active, in which
1447 * case it will be zeroed. Usually zil_suspend() accomplishes this.
1449 ASSERT(spa_version(dmu_tx_pool(tx
)->dp_spa
) >= SPA_VERSION_FAST_SNAP
||
1450 dmu_objset_from_ds(ds
, &os
) != 0 ||
1451 bcmp(&os
->os_phys
->os_zil_header
, &zero_zil
,
1452 sizeof (zero_zil
)) == 0);
1454 /* Should not snapshot a dirty dataset. */
1455 ASSERT(!txg_list_member(&ds
->ds_dir
->dd_pool
->dp_dirty_datasets
,
1458 dsl_fs_ss_count_adjust(ds
->ds_dir
, 1, DD_FIELD_SNAPSHOT_COUNT
, tx
);
1461 * The origin's ds_creation_txg has to be < TXG_INITIAL
1463 if (strcmp(snapname
, ORIGIN_DIR_NAME
) == 0)
1468 dsobj
= dmu_object_alloc(mos
, DMU_OT_DSL_DATASET
, 0,
1469 DMU_OT_DSL_DATASET
, sizeof (dsl_dataset_phys_t
), tx
);
1470 VERIFY0(dmu_bonus_hold(mos
, dsobj
, FTAG
, &dbuf
));
1471 dmu_buf_will_dirty(dbuf
, tx
);
1472 dsphys
= dbuf
->db_data
;
1473 bzero(dsphys
, sizeof (dsl_dataset_phys_t
));
1474 dsphys
->ds_dir_obj
= ds
->ds_dir
->dd_object
;
1475 dsphys
->ds_fsid_guid
= unique_create();
1476 (void) random_get_pseudo_bytes((void*)&dsphys
->ds_guid
,
1477 sizeof (dsphys
->ds_guid
));
1478 dsphys
->ds_prev_snap_obj
= dsl_dataset_phys(ds
)->ds_prev_snap_obj
;
1479 dsphys
->ds_prev_snap_txg
= dsl_dataset_phys(ds
)->ds_prev_snap_txg
;
1480 dsphys
->ds_next_snap_obj
= ds
->ds_object
;
1481 dsphys
->ds_num_children
= 1;
1482 dsphys
->ds_creation_time
= gethrestime_sec();
1483 dsphys
->ds_creation_txg
= crtxg
;
1484 dsphys
->ds_deadlist_obj
= dsl_dataset_phys(ds
)->ds_deadlist_obj
;
1485 dsphys
->ds_referenced_bytes
= dsl_dataset_phys(ds
)->ds_referenced_bytes
;
1486 dsphys
->ds_compressed_bytes
= dsl_dataset_phys(ds
)->ds_compressed_bytes
;
1487 dsphys
->ds_uncompressed_bytes
=
1488 dsl_dataset_phys(ds
)->ds_uncompressed_bytes
;
1489 dsphys
->ds_flags
= dsl_dataset_phys(ds
)->ds_flags
;
1490 rrw_enter(&ds
->ds_bp_rwlock
, RW_READER
, FTAG
);
1491 dsphys
->ds_bp
= dsl_dataset_phys(ds
)->ds_bp
;
1492 rrw_exit(&ds
->ds_bp_rwlock
, FTAG
);
1493 dmu_buf_rele(dbuf
, FTAG
);
1495 for (spa_feature_t f
= 0; f
< SPA_FEATURES
; f
++) {
1496 if (ds
->ds_feature_inuse
[f
])
1497 dsl_dataset_activate_feature(dsobj
, f
, tx
);
1500 ASSERT3U(ds
->ds_prev
!= 0, ==,
1501 dsl_dataset_phys(ds
)->ds_prev_snap_obj
!= 0);
1503 uint64_t next_clones_obj
=
1504 dsl_dataset_phys(ds
->ds_prev
)->ds_next_clones_obj
;
1505 ASSERT(dsl_dataset_phys(ds
->ds_prev
)->ds_next_snap_obj
==
1507 dsl_dataset_phys(ds
->ds_prev
)->ds_num_children
> 1);
1508 if (dsl_dataset_phys(ds
->ds_prev
)->ds_next_snap_obj
==
1510 dmu_buf_will_dirty(ds
->ds_prev
->ds_dbuf
, tx
);
1511 ASSERT3U(dsl_dataset_phys(ds
)->ds_prev_snap_txg
, ==,
1512 dsl_dataset_phys(ds
->ds_prev
)->ds_creation_txg
);
1513 dsl_dataset_phys(ds
->ds_prev
)->ds_next_snap_obj
= dsobj
;
1514 } else if (next_clones_obj
!= 0) {
1515 dsl_dataset_remove_from_next_clones(ds
->ds_prev
,
1516 dsphys
->ds_next_snap_obj
, tx
);
1517 VERIFY0(zap_add_int(mos
,
1518 next_clones_obj
, dsobj
, tx
));
1523 * If we have a reference-reservation on this dataset, we will
1524 * need to increase the amount of refreservation being charged
1525 * since our unique space is going to zero.
1527 if (ds
->ds_reserved
) {
1529 ASSERT(DS_UNIQUE_IS_ACCURATE(ds
));
1530 delta
= MIN(dsl_dataset_phys(ds
)->ds_unique_bytes
,
1532 dsl_dir_diduse_space(ds
->ds_dir
, DD_USED_REFRSRV
,
1536 dmu_buf_will_dirty(ds
->ds_dbuf
, tx
);
1537 dsl_dataset_phys(ds
)->ds_deadlist_obj
=
1538 dsl_deadlist_clone(&ds
->ds_deadlist
, UINT64_MAX
,
1539 dsl_dataset_phys(ds
)->ds_prev_snap_obj
, tx
);
1540 dsl_deadlist_close(&ds
->ds_deadlist
);
1541 dsl_deadlist_open(&ds
->ds_deadlist
, mos
,
1542 dsl_dataset_phys(ds
)->ds_deadlist_obj
);
1543 dsl_deadlist_add_key(&ds
->ds_deadlist
,
1544 dsl_dataset_phys(ds
)->ds_prev_snap_txg
, tx
);
1546 if (dsl_dataset_remap_deadlist_exists(ds
)) {
1547 uint64_t remap_deadlist_obj
=
1548 dsl_dataset_get_remap_deadlist_object(ds
);
1550 * Move the remap_deadlist to the snapshot. The head
1551 * will create a new remap deadlist on demand, from
1552 * dsl_dataset_block_remapped().
1554 dsl_dataset_unset_remap_deadlist_object(ds
, tx
);
1555 dsl_deadlist_close(&ds
->ds_remap_deadlist
);
1557 dmu_object_zapify(mos
, dsobj
, DMU_OT_DSL_DATASET
, tx
);
1558 VERIFY0(zap_add(mos
, dsobj
, DS_FIELD_REMAP_DEADLIST
,
1559 sizeof (remap_deadlist_obj
), 1, &remap_deadlist_obj
, tx
));
1563 * Create a ivset guid for this snapshot if the dataset is
1564 * encrypted. This may be overridden by a raw receive. A
1565 * previous implementation of this code did not have this
1566 * field as part of the on-disk format for ZFS encryption
1567 * (see errata #4). As part of the remediation for this
1568 * issue, we ask the user to enable the bookmark_v2 feature
1569 * which is now a dependency of the encryption feature. We
1570 * use this as a heuristic to determine when the user has
1571 * elected to correct any datasets created with the old code.
1572 * As a result, we only do this step if the bookmark_v2
1573 * feature is enabled, which limits the number of states a
1574 * given pool / dataset can be in with regards to terms of
1575 * correcting the issue.
1577 if (ds
->ds_dir
->dd_crypto_obj
!= 0 &&
1578 spa_feature_is_enabled(dp
->dp_spa
, SPA_FEATURE_BOOKMARK_V2
)) {
1579 uint64_t ivset_guid
= unique_create();
1581 dmu_object_zapify(mos
, dsobj
, DMU_OT_DSL_DATASET
, tx
);
1582 VERIFY0(zap_add(mos
, dsobj
, DS_FIELD_IVSET_GUID
,
1583 sizeof (ivset_guid
), 1, &ivset_guid
, tx
));
1586 ASSERT3U(dsl_dataset_phys(ds
)->ds_prev_snap_txg
, <, tx
->tx_txg
);
1587 dsl_dataset_phys(ds
)->ds_prev_snap_obj
= dsobj
;
1588 dsl_dataset_phys(ds
)->ds_prev_snap_txg
= crtxg
;
1589 dsl_dataset_phys(ds
)->ds_unique_bytes
= 0;
1591 if (spa_version(dp
->dp_spa
) >= SPA_VERSION_UNIQUE_ACCURATE
)
1592 dsl_dataset_phys(ds
)->ds_flags
|= DS_FLAG_UNIQUE_ACCURATE
;
1594 VERIFY0(zap_add(mos
, dsl_dataset_phys(ds
)->ds_snapnames_zapobj
,
1595 snapname
, 8, 1, &dsobj
, tx
));
1598 dsl_dataset_rele(ds
->ds_prev
, ds
);
1599 VERIFY0(dsl_dataset_hold_obj(dp
,
1600 dsl_dataset_phys(ds
)->ds_prev_snap_obj
, ds
, &ds
->ds_prev
));
1602 dsl_scan_ds_snapshotted(ds
, tx
);
1604 dsl_dir_snap_cmtime_update(ds
->ds_dir
);
1606 spa_history_log_internal_ds(ds
->ds_prev
, "snapshot", tx
, "");
1610 dsl_dataset_snapshot_sync(void *arg
, dmu_tx_t
*tx
)
1612 dsl_dataset_snapshot_arg_t
*ddsa
= arg
;
1613 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
1616 for (pair
= nvlist_next_nvpair(ddsa
->ddsa_snaps
, NULL
);
1617 pair
!= NULL
; pair
= nvlist_next_nvpair(ddsa
->ddsa_snaps
, pair
)) {
1620 char dsname
[ZFS_MAX_DATASET_NAME_LEN
];
1622 name
= nvpair_name(pair
);
1623 atp
= strchr(name
, '@');
1624 (void) strlcpy(dsname
, name
, atp
- name
+ 1);
1625 VERIFY0(dsl_dataset_hold(dp
, dsname
, FTAG
, &ds
));
1627 dsl_dataset_snapshot_sync_impl(ds
, atp
+ 1, tx
);
1628 if (ddsa
->ddsa_props
!= NULL
) {
1629 dsl_props_set_sync_impl(ds
->ds_prev
,
1630 ZPROP_SRC_LOCAL
, ddsa
->ddsa_props
, tx
);
1632 dsl_dataset_rele(ds
, FTAG
);
1637 * The snapshots must all be in the same pool.
1638 * All-or-nothing: if there are any failures, nothing will be modified.
1641 dsl_dataset_snapshot(nvlist_t
*snaps
, nvlist_t
*props
, nvlist_t
*errors
)
1643 dsl_dataset_snapshot_arg_t ddsa
;
1645 boolean_t needsuspend
;
1649 nvlist_t
*suspended
= NULL
;
1651 pair
= nvlist_next_nvpair(snaps
, NULL
);
1654 firstname
= nvpair_name(pair
);
1656 error
= spa_open(firstname
, &spa
, FTAG
);
1659 needsuspend
= (spa_version(spa
) < SPA_VERSION_FAST_SNAP
);
1660 spa_close(spa
, FTAG
);
1663 suspended
= fnvlist_alloc();
1664 for (pair
= nvlist_next_nvpair(snaps
, NULL
); pair
!= NULL
;
1665 pair
= nvlist_next_nvpair(snaps
, pair
)) {
1666 char fsname
[ZFS_MAX_DATASET_NAME_LEN
];
1667 char *snapname
= nvpair_name(pair
);
1671 atp
= strchr(snapname
, '@');
1673 error
= SET_ERROR(EINVAL
);
1676 (void) strlcpy(fsname
, snapname
, atp
- snapname
+ 1);
1678 error
= zil_suspend(fsname
, &cookie
);
1681 fnvlist_add_uint64(suspended
, fsname
,
1686 ddsa
.ddsa_snaps
= snaps
;
1687 ddsa
.ddsa_props
= props
;
1688 ddsa
.ddsa_errors
= errors
;
1689 ddsa
.ddsa_cr
= CRED();
1692 error
= dsl_sync_task(firstname
, dsl_dataset_snapshot_check
,
1693 dsl_dataset_snapshot_sync
, &ddsa
,
1694 fnvlist_num_pairs(snaps
) * 3, ZFS_SPACE_CHECK_NORMAL
);
1697 if (suspended
!= NULL
) {
1698 for (pair
= nvlist_next_nvpair(suspended
, NULL
); pair
!= NULL
;
1699 pair
= nvlist_next_nvpair(suspended
, pair
)) {
1700 zil_resume((void *)(uintptr_t)
1701 fnvpair_value_uint64(pair
));
1703 fnvlist_free(suspended
);
1709 typedef struct dsl_dataset_snapshot_tmp_arg
{
1710 const char *ddsta_fsname
;
1711 const char *ddsta_snapname
;
1712 minor_t ddsta_cleanup_minor
;
1713 const char *ddsta_htag
;
1714 } dsl_dataset_snapshot_tmp_arg_t
;
1717 dsl_dataset_snapshot_tmp_check(void *arg
, dmu_tx_t
*tx
)
1719 dsl_dataset_snapshot_tmp_arg_t
*ddsta
= arg
;
1720 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
1724 error
= dsl_dataset_hold(dp
, ddsta
->ddsta_fsname
, FTAG
, &ds
);
1728 /* NULL cred means no limit check for tmp snapshot */
1729 error
= dsl_dataset_snapshot_check_impl(ds
, ddsta
->ddsta_snapname
,
1730 tx
, B_FALSE
, 0, NULL
);
1732 dsl_dataset_rele(ds
, FTAG
);
1736 if (spa_version(dp
->dp_spa
) < SPA_VERSION_USERREFS
) {
1737 dsl_dataset_rele(ds
, FTAG
);
1738 return (SET_ERROR(ENOTSUP
));
1740 error
= dsl_dataset_user_hold_check_one(NULL
, ddsta
->ddsta_htag
,
1743 dsl_dataset_rele(ds
, FTAG
);
1747 dsl_dataset_rele(ds
, FTAG
);
1752 dsl_dataset_snapshot_tmp_sync(void *arg
, dmu_tx_t
*tx
)
1754 dsl_dataset_snapshot_tmp_arg_t
*ddsta
= arg
;
1755 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
1758 VERIFY0(dsl_dataset_hold(dp
, ddsta
->ddsta_fsname
, FTAG
, &ds
));
1760 dsl_dataset_snapshot_sync_impl(ds
, ddsta
->ddsta_snapname
, tx
);
1761 dsl_dataset_user_hold_sync_one(ds
->ds_prev
, ddsta
->ddsta_htag
,
1762 ddsta
->ddsta_cleanup_minor
, gethrestime_sec(), tx
);
1763 dsl_destroy_snapshot_sync_impl(ds
->ds_prev
, B_TRUE
, tx
);
1765 dsl_dataset_rele(ds
, FTAG
);
1769 dsl_dataset_snapshot_tmp(const char *fsname
, const char *snapname
,
1770 minor_t cleanup_minor
, const char *htag
)
1772 dsl_dataset_snapshot_tmp_arg_t ddsta
;
1775 boolean_t needsuspend
;
1778 ddsta
.ddsta_fsname
= fsname
;
1779 ddsta
.ddsta_snapname
= snapname
;
1780 ddsta
.ddsta_cleanup_minor
= cleanup_minor
;
1781 ddsta
.ddsta_htag
= htag
;
1783 error
= spa_open(fsname
, &spa
, FTAG
);
1786 needsuspend
= (spa_version(spa
) < SPA_VERSION_FAST_SNAP
);
1787 spa_close(spa
, FTAG
);
1790 error
= zil_suspend(fsname
, &cookie
);
1795 error
= dsl_sync_task(fsname
, dsl_dataset_snapshot_tmp_check
,
1796 dsl_dataset_snapshot_tmp_sync
, &ddsta
, 3, ZFS_SPACE_CHECK_RESERVED
);
1804 dsl_dataset_sync(dsl_dataset_t
*ds
, zio_t
*zio
, dmu_tx_t
*tx
)
1806 ASSERT(dmu_tx_is_syncing(tx
));
1807 ASSERT(ds
->ds_objset
!= NULL
);
1808 ASSERT(dsl_dataset_phys(ds
)->ds_next_snap_obj
== 0);
1811 * in case we had to change ds_fsid_guid when we opened it,
1814 dmu_buf_will_dirty(ds
->ds_dbuf
, tx
);
1815 dsl_dataset_phys(ds
)->ds_fsid_guid
= ds
->ds_fsid_guid
;
1817 if (ds
->ds_resume_bytes
[tx
->tx_txg
& TXG_MASK
] != 0) {
1818 VERIFY0(zap_update(tx
->tx_pool
->dp_meta_objset
,
1819 ds
->ds_object
, DS_FIELD_RESUME_OBJECT
, 8, 1,
1820 &ds
->ds_resume_object
[tx
->tx_txg
& TXG_MASK
], tx
));
1821 VERIFY0(zap_update(tx
->tx_pool
->dp_meta_objset
,
1822 ds
->ds_object
, DS_FIELD_RESUME_OFFSET
, 8, 1,
1823 &ds
->ds_resume_offset
[tx
->tx_txg
& TXG_MASK
], tx
));
1824 VERIFY0(zap_update(tx
->tx_pool
->dp_meta_objset
,
1825 ds
->ds_object
, DS_FIELD_RESUME_BYTES
, 8, 1,
1826 &ds
->ds_resume_bytes
[tx
->tx_txg
& TXG_MASK
], tx
));
1827 ds
->ds_resume_object
[tx
->tx_txg
& TXG_MASK
] = 0;
1828 ds
->ds_resume_offset
[tx
->tx_txg
& TXG_MASK
] = 0;
1829 ds
->ds_resume_bytes
[tx
->tx_txg
& TXG_MASK
] = 0;
1832 dmu_objset_sync(ds
->ds_objset
, zio
, tx
);
1834 for (spa_feature_t f
= 0; f
< SPA_FEATURES
; f
++) {
1835 if (ds
->ds_feature_activation_needed
[f
]) {
1836 if (ds
->ds_feature_inuse
[f
])
1838 dsl_dataset_activate_feature(ds
->ds_object
, f
, tx
);
1839 ds
->ds_feature_inuse
[f
] = B_TRUE
;
1845 deadlist_enqueue_cb(void *arg
, const blkptr_t
*bp
, dmu_tx_t
*tx
)
1847 dsl_deadlist_t
*dl
= arg
;
1848 dsl_deadlist_insert(dl
, bp
, tx
);
1853 dsl_dataset_sync_done(dsl_dataset_t
*ds
, dmu_tx_t
*tx
)
1855 objset_t
*os
= ds
->ds_objset
;
1857 bplist_iterate(&ds
->ds_pending_deadlist
,
1858 deadlist_enqueue_cb
, &ds
->ds_deadlist
, tx
);
1860 if (os
->os_synced_dnodes
!= NULL
) {
1861 multilist_destroy(os
->os_synced_dnodes
);
1862 os
->os_synced_dnodes
= NULL
;
1865 if (os
->os_encrypted
)
1866 os
->os_next_write_raw
[tx
->tx_txg
& TXG_MASK
] = B_FALSE
;
1868 ASSERT0(os
->os_next_write_raw
[tx
->tx_txg
& TXG_MASK
]);
1870 ASSERT(!dmu_objset_is_dirty(os
, dmu_tx_get_txg(tx
)));
1872 dmu_buf_rele(ds
->ds_dbuf
, ds
);
1876 get_clones_stat_impl(dsl_dataset_t
*ds
, nvlist_t
*val
)
1879 objset_t
*mos
= ds
->ds_dir
->dd_pool
->dp_meta_objset
;
1883 ASSERT(dsl_pool_config_held(ds
->ds_dir
->dd_pool
));
1886 * There may be missing entries in ds_next_clones_obj
1887 * due to a bug in a previous version of the code.
1888 * Only trust it if it has the right number of entries.
1890 if (dsl_dataset_phys(ds
)->ds_next_clones_obj
!= 0) {
1891 VERIFY0(zap_count(mos
, dsl_dataset_phys(ds
)->ds_next_clones_obj
,
1894 if (count
!= dsl_dataset_phys(ds
)->ds_num_children
- 1) {
1897 for (zap_cursor_init(&zc
, mos
,
1898 dsl_dataset_phys(ds
)->ds_next_clones_obj
);
1899 zap_cursor_retrieve(&zc
, &za
) == 0;
1900 zap_cursor_advance(&zc
)) {
1901 dsl_dataset_t
*clone
;
1902 char buf
[ZFS_MAX_DATASET_NAME_LEN
];
1903 VERIFY0(dsl_dataset_hold_obj(ds
->ds_dir
->dd_pool
,
1904 za
.za_first_integer
, FTAG
, &clone
));
1905 dsl_dir_name(clone
->ds_dir
, buf
);
1906 fnvlist_add_boolean(val
, buf
);
1907 dsl_dataset_rele(clone
, FTAG
);
1909 zap_cursor_fini(&zc
);
1914 get_clones_stat(dsl_dataset_t
*ds
, nvlist_t
*nv
)
1916 nvlist_t
*propval
= fnvlist_alloc();
1920 * We use nvlist_alloc() instead of fnvlist_alloc() because the
1921 * latter would allocate the list with NV_UNIQUE_NAME flag.
1922 * As a result, every time a clone name is appended to the list
1923 * it would be (linearly) searched for for a duplicate name.
1924 * We already know that all clone names must be unique and we
1925 * want avoid the quadratic complexity of double-checking that
1926 * because we can have a large number of clones.
1928 VERIFY0(nvlist_alloc(&val
, 0, KM_SLEEP
));
1930 if (get_clones_stat_impl(ds
, val
) == 0) {
1931 fnvlist_add_nvlist(propval
, ZPROP_VALUE
, val
);
1932 fnvlist_add_nvlist(nv
, zfs_prop_to_name(ZFS_PROP_CLONES
),
1937 nvlist_free(propval
);
1941 * Returns a string that represents the receive resume stats token. It should
1942 * be freed with strfree().
1945 get_receive_resume_stats_impl(dsl_dataset_t
*ds
)
1947 dsl_pool_t
*dp
= ds
->ds_dir
->dd_pool
;
1949 if (dsl_dataset_has_resume_receive_state(ds
)) {
1952 uint8_t *compressed
;
1954 nvlist_t
*token_nv
= fnvlist_alloc();
1955 size_t packed_size
, compressed_size
;
1957 if (zap_lookup(dp
->dp_meta_objset
, ds
->ds_object
,
1958 DS_FIELD_RESUME_FROMGUID
, sizeof (val
), 1, &val
) == 0) {
1959 fnvlist_add_uint64(token_nv
, "fromguid", val
);
1961 if (zap_lookup(dp
->dp_meta_objset
, ds
->ds_object
,
1962 DS_FIELD_RESUME_OBJECT
, sizeof (val
), 1, &val
) == 0) {
1963 fnvlist_add_uint64(token_nv
, "object", val
);
1965 if (zap_lookup(dp
->dp_meta_objset
, ds
->ds_object
,
1966 DS_FIELD_RESUME_OFFSET
, sizeof (val
), 1, &val
) == 0) {
1967 fnvlist_add_uint64(token_nv
, "offset", val
);
1969 if (zap_lookup(dp
->dp_meta_objset
, ds
->ds_object
,
1970 DS_FIELD_RESUME_BYTES
, sizeof (val
), 1, &val
) == 0) {
1971 fnvlist_add_uint64(token_nv
, "bytes", val
);
1973 if (zap_lookup(dp
->dp_meta_objset
, ds
->ds_object
,
1974 DS_FIELD_RESUME_TOGUID
, sizeof (val
), 1, &val
) == 0) {
1975 fnvlist_add_uint64(token_nv
, "toguid", val
);
1978 if (zap_lookup(dp
->dp_meta_objset
, ds
->ds_object
,
1979 DS_FIELD_RESUME_TONAME
, 1, sizeof (buf
), buf
) == 0) {
1980 fnvlist_add_string(token_nv
, "toname", buf
);
1982 if (zap_contains(dp
->dp_meta_objset
, ds
->ds_object
,
1983 DS_FIELD_RESUME_LARGEBLOCK
) == 0) {
1984 fnvlist_add_boolean(token_nv
, "largeblockok");
1986 if (zap_contains(dp
->dp_meta_objset
, ds
->ds_object
,
1987 DS_FIELD_RESUME_EMBEDOK
) == 0) {
1988 fnvlist_add_boolean(token_nv
, "embedok");
1990 if (zap_contains(dp
->dp_meta_objset
, ds
->ds_object
,
1991 DS_FIELD_RESUME_COMPRESSOK
) == 0) {
1992 fnvlist_add_boolean(token_nv
, "compressok");
1994 if (zap_contains(dp
->dp_meta_objset
, ds
->ds_object
,
1995 DS_FIELD_RESUME_RAWOK
) == 0) {
1996 fnvlist_add_boolean(token_nv
, "rawok");
1998 packed
= fnvlist_pack(token_nv
, &packed_size
);
1999 fnvlist_free(token_nv
);
2000 compressed
= kmem_alloc(packed_size
, KM_SLEEP
);
2002 compressed_size
= gzip_compress(packed
, compressed
,
2003 packed_size
, packed_size
, 6);
2006 fletcher_4_native_varsize(compressed
, compressed_size
, &cksum
);
2008 str
= kmem_alloc(compressed_size
* 2 + 1, KM_SLEEP
);
2009 for (int i
= 0; i
< compressed_size
; i
++) {
2010 (void) sprintf(str
+ i
* 2, "%02x", compressed
[i
]);
2012 str
[compressed_size
* 2] = '\0';
2013 char *propval
= kmem_asprintf("%u-%llx-%llx-%s",
2014 ZFS_SEND_RESUME_TOKEN_VERSION
,
2015 (longlong_t
)cksum
.zc_word
[0],
2016 (longlong_t
)packed_size
, str
);
2017 kmem_free(packed
, packed_size
);
2018 kmem_free(str
, compressed_size
* 2 + 1);
2019 kmem_free(compressed
, packed_size
);
2022 return (strdup(""));
2026 * Returns a string that represents the receive resume stats token of the
2027 * dataset's child. It should be freed with strfree().
2030 get_child_receive_stats(dsl_dataset_t
*ds
)
2032 char recvname
[ZFS_MAX_DATASET_NAME_LEN
+ 6];
2033 dsl_dataset_t
*recv_ds
;
2034 dsl_dataset_name(ds
, recvname
);
2035 if (strlcat(recvname
, "/", sizeof (recvname
)) <
2036 sizeof (recvname
) &&
2037 strlcat(recvname
, recv_clone_name
, sizeof (recvname
)) <
2038 sizeof (recvname
) &&
2039 dsl_dataset_hold(ds
->ds_dir
->dd_pool
, recvname
, FTAG
,
2041 char *propval
= get_receive_resume_stats_impl(recv_ds
);
2042 dsl_dataset_rele(recv_ds
, FTAG
);
2045 return (strdup(""));
2049 get_receive_resume_stats(dsl_dataset_t
*ds
, nvlist_t
*nv
)
2051 char *propval
= get_receive_resume_stats_impl(ds
);
2052 if (strcmp(propval
, "") != 0) {
2053 dsl_prop_nvlist_add_string(nv
,
2054 ZFS_PROP_RECEIVE_RESUME_TOKEN
, propval
);
2056 char *childval
= get_child_receive_stats(ds
);
2057 if (strcmp(childval
, "") != 0) {
2058 dsl_prop_nvlist_add_string(nv
,
2059 ZFS_PROP_RECEIVE_RESUME_TOKEN
, childval
);
2067 dsl_get_refratio(dsl_dataset_t
*ds
)
2069 uint64_t ratio
= dsl_dataset_phys(ds
)->ds_compressed_bytes
== 0 ? 100 :
2070 (dsl_dataset_phys(ds
)->ds_uncompressed_bytes
* 100 /
2071 dsl_dataset_phys(ds
)->ds_compressed_bytes
);
2076 dsl_get_logicalreferenced(dsl_dataset_t
*ds
)
2078 return (dsl_dataset_phys(ds
)->ds_uncompressed_bytes
);
2082 dsl_get_compressratio(dsl_dataset_t
*ds
)
2084 if (ds
->ds_is_snapshot
) {
2085 return (dsl_get_refratio(ds
));
2087 dsl_dir_t
*dd
= ds
->ds_dir
;
2088 mutex_enter(&dd
->dd_lock
);
2089 uint64_t val
= dsl_dir_get_compressratio(dd
);
2090 mutex_exit(&dd
->dd_lock
);
2096 dsl_get_used(dsl_dataset_t
*ds
)
2098 if (ds
->ds_is_snapshot
) {
2099 return (dsl_dataset_phys(ds
)->ds_unique_bytes
);
2101 dsl_dir_t
*dd
= ds
->ds_dir
;
2102 mutex_enter(&dd
->dd_lock
);
2103 uint64_t val
= dsl_dir_get_used(dd
);
2104 mutex_exit(&dd
->dd_lock
);
2110 dsl_get_creation(dsl_dataset_t
*ds
)
2112 return (dsl_dataset_phys(ds
)->ds_creation_time
);
2116 dsl_get_creationtxg(dsl_dataset_t
*ds
)
2118 return (dsl_dataset_phys(ds
)->ds_creation_txg
);
2122 dsl_get_refquota(dsl_dataset_t
*ds
)
2124 return (ds
->ds_quota
);
2128 dsl_get_refreservation(dsl_dataset_t
*ds
)
2130 return (ds
->ds_reserved
);
2134 dsl_get_guid(dsl_dataset_t
*ds
)
2136 return (dsl_dataset_phys(ds
)->ds_guid
);
2140 dsl_get_unique(dsl_dataset_t
*ds
)
2142 return (dsl_dataset_phys(ds
)->ds_unique_bytes
);
2146 dsl_get_objsetid(dsl_dataset_t
*ds
)
2148 return (ds
->ds_object
);
2152 dsl_get_userrefs(dsl_dataset_t
*ds
)
2154 return (ds
->ds_userrefs
);
2158 dsl_get_defer_destroy(dsl_dataset_t
*ds
)
2160 return (DS_IS_DEFER_DESTROY(ds
) ? 1 : 0);
2164 dsl_get_referenced(dsl_dataset_t
*ds
)
2166 return (dsl_dataset_phys(ds
)->ds_referenced_bytes
);
2170 dsl_get_numclones(dsl_dataset_t
*ds
)
2172 ASSERT(ds
->ds_is_snapshot
);
2173 return (dsl_dataset_phys(ds
)->ds_num_children
- 1);
2177 dsl_get_inconsistent(dsl_dataset_t
*ds
)
2179 return ((dsl_dataset_phys(ds
)->ds_flags
& DS_FLAG_INCONSISTENT
) ?
2184 dsl_get_available(dsl_dataset_t
*ds
)
2186 uint64_t refdbytes
= dsl_get_referenced(ds
);
2187 uint64_t availbytes
= dsl_dir_space_available(ds
->ds_dir
,
2189 if (ds
->ds_reserved
> dsl_dataset_phys(ds
)->ds_unique_bytes
) {
2191 ds
->ds_reserved
- dsl_dataset_phys(ds
)->ds_unique_bytes
;
2193 if (ds
->ds_quota
!= 0) {
2195 * Adjust available bytes according to refquota
2197 if (refdbytes
< ds
->ds_quota
) {
2198 availbytes
= MIN(availbytes
,
2199 ds
->ds_quota
- refdbytes
);
2204 return (availbytes
);
2208 dsl_get_written(dsl_dataset_t
*ds
, uint64_t *written
)
2210 dsl_pool_t
*dp
= ds
->ds_dir
->dd_pool
;
2211 dsl_dataset_t
*prev
;
2212 int err
= dsl_dataset_hold_obj(dp
,
2213 dsl_dataset_phys(ds
)->ds_prev_snap_obj
, FTAG
, &prev
);
2215 uint64_t comp
, uncomp
;
2216 err
= dsl_dataset_space_written(prev
, ds
, written
,
2218 dsl_dataset_rele(prev
, FTAG
);
2224 * 'snap' should be a buffer of size ZFS_MAX_DATASET_NAME_LEN.
2227 dsl_get_prev_snap(dsl_dataset_t
*ds
, char *snap
)
2229 dsl_pool_t
*dp
= ds
->ds_dir
->dd_pool
;
2230 if (ds
->ds_prev
!= NULL
&& ds
->ds_prev
!= dp
->dp_origin_snap
) {
2231 dsl_dataset_name(ds
->ds_prev
, snap
);
2239 * Returns the mountpoint property and source for the given dataset in the value
2240 * and source buffers. The value buffer must be at least as large as MAXPATHLEN
2241 * and the source buffer as least as large a ZFS_MAX_DATASET_NAME_LEN.
2242 * Returns 0 on success and an error on failure.
2245 dsl_get_mountpoint(dsl_dataset_t
*ds
, const char *dsname
, char *value
,
2249 dsl_pool_t
*dp
= ds
->ds_dir
->dd_pool
;
2251 /* Retrieve the mountpoint value stored in the zap opbject */
2252 error
= dsl_prop_get_ds(ds
, zfs_prop_to_name(ZFS_PROP_MOUNTPOINT
), 1,
2253 ZAP_MAXVALUELEN
, value
, source
);
2259 * Process the dsname and source to find the full mountpoint string.
2260 * Can be skipped for 'legacy' or 'none'.
2262 if (value
[0] == '/') {
2263 char *buf
= kmem_alloc(ZAP_MAXVALUELEN
, KM_SLEEP
);
2265 const char *relpath
;
2268 * If we inherit the mountpoint, even from a dataset
2269 * with a received value, the source will be the path of
2270 * the dataset we inherit from. If source is
2271 * ZPROP_SOURCE_VAL_RECVD, the received value is not
2274 if (strcmp(source
, ZPROP_SOURCE_VAL_RECVD
) == 0) {
2277 ASSERT0(strncmp(dsname
, source
, strlen(source
)));
2278 relpath
= dsname
+ strlen(source
);
2279 if (relpath
[0] == '/')
2283 spa_altroot(dp
->dp_spa
, root
, ZAP_MAXVALUELEN
);
2286 * Special case an alternate root of '/'. This will
2287 * avoid having multiple leading slashes in the
2290 if (strcmp(root
, "/") == 0)
2294 * If the mountpoint is '/' then skip over this
2295 * if we are obtaining either an alternate root or
2296 * an inherited mountpoint.
2299 if (value
[1] == '\0' && (root
[0] != '\0' ||
2300 relpath
[0] != '\0'))
2303 if (relpath
[0] == '\0') {
2304 (void) snprintf(value
, ZAP_MAXVALUELEN
, "%s%s",
2307 (void) snprintf(value
, ZAP_MAXVALUELEN
, "%s%s%s%s",
2308 root
, mnt
, relpath
[0] == '@' ? "" : "/",
2311 kmem_free(buf
, ZAP_MAXVALUELEN
);
2318 dsl_dataset_stats(dsl_dataset_t
*ds
, nvlist_t
*nv
)
2321 dsl_pool_t
*dp
= ds
->ds_dir
->dd_pool
;
2323 ASSERT(dsl_pool_config_held(dp
));
2325 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_REFRATIO
,
2326 dsl_get_refratio(ds
));
2327 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_LOGICALREFERENCED
,
2328 dsl_get_logicalreferenced(ds
));
2329 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_COMPRESSRATIO
,
2330 dsl_get_compressratio(ds
));
2331 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_USED
,
2334 if (ds
->ds_is_snapshot
) {
2335 get_clones_stat(ds
, nv
);
2337 char buf
[ZFS_MAX_DATASET_NAME_LEN
];
2338 if (dsl_get_prev_snap(ds
, buf
) == 0)
2339 dsl_prop_nvlist_add_string(nv
, ZFS_PROP_PREV_SNAP
,
2341 dsl_dir_stats(ds
->ds_dir
, nv
);
2344 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_AVAILABLE
,
2345 dsl_get_available(ds
));
2346 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_REFERENCED
,
2347 dsl_get_referenced(ds
));
2348 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_CREATION
,
2349 dsl_get_creation(ds
));
2350 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_CREATETXG
,
2351 dsl_get_creationtxg(ds
));
2352 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_REFQUOTA
,
2353 dsl_get_refquota(ds
));
2354 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_REFRESERVATION
,
2355 dsl_get_refreservation(ds
));
2356 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_GUID
,
2358 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_UNIQUE
,
2359 dsl_get_unique(ds
));
2360 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_OBJSETID
,
2361 dsl_get_objsetid(ds
));
2362 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_USERREFS
,
2363 dsl_get_userrefs(ds
));
2364 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_DEFER_DESTROY
,
2365 DS_IS_DEFER_DESTROY(ds
) ? 1 : 0);
2366 dsl_dataset_crypt_stats(ds
, nv
);
2368 if (dsl_dataset_phys(ds
)->ds_prev_snap_obj
!= 0) {
2369 uint64_t written
, comp
, uncomp
;
2370 dsl_pool_t
*dp
= ds
->ds_dir
->dd_pool
;
2371 dsl_dataset_t
*prev
;
2373 err
= dsl_dataset_hold_obj(dp
,
2374 dsl_dataset_phys(ds
)->ds_prev_snap_obj
, FTAG
, &prev
);
2376 err
= dsl_dataset_space_written(prev
, ds
, &written
,
2378 dsl_dataset_rele(prev
, FTAG
);
2380 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_WRITTEN
,
2386 if (!dsl_dataset_is_snapshot(ds
)) {
2388 * A failed "newfs" (e.g. full) resumable receive leaves
2389 * the stats set on this dataset. Check here for the prop.
2391 get_receive_resume_stats(ds
, nv
);
2394 * A failed incremental resumable receive leaves the
2395 * stats set on our child named "%recv". Check the child
2398 /* 6 extra bytes for /%recv */
2399 char recvname
[ZFS_MAX_DATASET_NAME_LEN
+ 6];
2400 dsl_dataset_t
*recv_ds
;
2401 dsl_dataset_name(ds
, recvname
);
2402 if (strlcat(recvname
, "/", sizeof (recvname
)) <
2403 sizeof (recvname
) &&
2404 strlcat(recvname
, recv_clone_name
, sizeof (recvname
)) <
2405 sizeof (recvname
) &&
2406 dsl_dataset_hold(dp
, recvname
, FTAG
, &recv_ds
) == 0) {
2407 get_receive_resume_stats(recv_ds
, nv
);
2408 dsl_dataset_rele(recv_ds
, FTAG
);
2414 dsl_dataset_fast_stat(dsl_dataset_t
*ds
, dmu_objset_stats_t
*stat
)
2416 dsl_pool_t
*dp
= ds
->ds_dir
->dd_pool
;
2417 ASSERT(dsl_pool_config_held(dp
));
2419 stat
->dds_creation_txg
= dsl_get_creationtxg(ds
);
2420 stat
->dds_inconsistent
= dsl_get_inconsistent(ds
);
2421 stat
->dds_guid
= dsl_get_guid(ds
);
2422 stat
->dds_origin
[0] = '\0';
2423 if (ds
->ds_is_snapshot
) {
2424 stat
->dds_is_snapshot
= B_TRUE
;
2425 stat
->dds_num_clones
= dsl_get_numclones(ds
);
2427 stat
->dds_is_snapshot
= B_FALSE
;
2428 stat
->dds_num_clones
= 0;
2430 if (dsl_dir_is_clone(ds
->ds_dir
)) {
2431 dsl_dir_get_origin(ds
->ds_dir
, stat
->dds_origin
);
2437 dsl_dataset_fsid_guid(dsl_dataset_t
*ds
)
2439 return (ds
->ds_fsid_guid
);
2443 dsl_dataset_space(dsl_dataset_t
*ds
,
2444 uint64_t *refdbytesp
, uint64_t *availbytesp
,
2445 uint64_t *usedobjsp
, uint64_t *availobjsp
)
2447 *refdbytesp
= dsl_dataset_phys(ds
)->ds_referenced_bytes
;
2448 *availbytesp
= dsl_dir_space_available(ds
->ds_dir
, NULL
, 0, TRUE
);
2449 if (ds
->ds_reserved
> dsl_dataset_phys(ds
)->ds_unique_bytes
)
2451 ds
->ds_reserved
- dsl_dataset_phys(ds
)->ds_unique_bytes
;
2452 if (ds
->ds_quota
!= 0) {
2454 * Adjust available bytes according to refquota
2456 if (*refdbytesp
< ds
->ds_quota
)
2457 *availbytesp
= MIN(*availbytesp
,
2458 ds
->ds_quota
- *refdbytesp
);
2462 rrw_enter(&ds
->ds_bp_rwlock
, RW_READER
, FTAG
);
2463 *usedobjsp
= BP_GET_FILL(&dsl_dataset_phys(ds
)->ds_bp
);
2464 rrw_exit(&ds
->ds_bp_rwlock
, FTAG
);
2465 *availobjsp
= DN_MAX_OBJECT
- *usedobjsp
;
2469 dsl_dataset_modified_since_snap(dsl_dataset_t
*ds
, dsl_dataset_t
*snap
)
2471 dsl_pool_t
*dp
= ds
->ds_dir
->dd_pool
;
2474 ASSERT(dsl_pool_config_held(dp
));
2477 rrw_enter(&ds
->ds_bp_rwlock
, RW_READER
, FTAG
);
2478 birth
= dsl_dataset_get_blkptr(ds
)->blk_birth
;
2479 rrw_exit(&ds
->ds_bp_rwlock
, FTAG
);
2480 if (birth
> dsl_dataset_phys(snap
)->ds_creation_txg
) {
2481 objset_t
*os
, *os_snap
;
2483 * It may be that only the ZIL differs, because it was
2484 * reset in the head. Don't count that as being
2487 if (dmu_objset_from_ds(ds
, &os
) != 0)
2489 if (dmu_objset_from_ds(snap
, &os_snap
) != 0)
2491 return (bcmp(&os
->os_phys
->os_meta_dnode
,
2492 &os_snap
->os_phys
->os_meta_dnode
,
2493 sizeof (os
->os_phys
->os_meta_dnode
)) != 0);
2498 typedef struct dsl_dataset_rename_snapshot_arg
{
2499 const char *ddrsa_fsname
;
2500 const char *ddrsa_oldsnapname
;
2501 const char *ddrsa_newsnapname
;
2502 boolean_t ddrsa_recursive
;
2504 } dsl_dataset_rename_snapshot_arg_t
;
2508 dsl_dataset_rename_snapshot_check_impl(dsl_pool_t
*dp
,
2509 dsl_dataset_t
*hds
, void *arg
)
2511 dsl_dataset_rename_snapshot_arg_t
*ddrsa
= arg
;
2515 error
= dsl_dataset_snap_lookup(hds
, ddrsa
->ddrsa_oldsnapname
, &val
);
2517 /* ignore nonexistent snapshots */
2518 return (error
== ENOENT
? 0 : error
);
2521 /* new name should not exist */
2522 error
= dsl_dataset_snap_lookup(hds
, ddrsa
->ddrsa_newsnapname
, &val
);
2524 error
= SET_ERROR(EEXIST
);
2525 else if (error
== ENOENT
)
2528 /* dataset name + 1 for the "@" + the new snapshot name must fit */
2529 if (dsl_dir_namelen(hds
->ds_dir
) + 1 +
2530 strlen(ddrsa
->ddrsa_newsnapname
) >= ZFS_MAX_DATASET_NAME_LEN
)
2531 error
= SET_ERROR(ENAMETOOLONG
);
2537 dsl_dataset_rename_snapshot_check(void *arg
, dmu_tx_t
*tx
)
2539 dsl_dataset_rename_snapshot_arg_t
*ddrsa
= arg
;
2540 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
2544 error
= dsl_dataset_hold(dp
, ddrsa
->ddrsa_fsname
, FTAG
, &hds
);
2548 if (ddrsa
->ddrsa_recursive
) {
2549 error
= dmu_objset_find_dp(dp
, hds
->ds_dir
->dd_object
,
2550 dsl_dataset_rename_snapshot_check_impl
, ddrsa
,
2553 error
= dsl_dataset_rename_snapshot_check_impl(dp
, hds
, ddrsa
);
2555 dsl_dataset_rele(hds
, FTAG
);
2560 dsl_dataset_rename_snapshot_sync_impl(dsl_pool_t
*dp
,
2561 dsl_dataset_t
*hds
, void *arg
)
2563 dsl_dataset_rename_snapshot_arg_t
*ddrsa
= arg
;
2566 dmu_tx_t
*tx
= ddrsa
->ddrsa_tx
;
2569 error
= dsl_dataset_snap_lookup(hds
, ddrsa
->ddrsa_oldsnapname
, &val
);
2570 ASSERT(error
== 0 || error
== ENOENT
);
2571 if (error
== ENOENT
) {
2572 /* ignore nonexistent snapshots */
2576 VERIFY0(dsl_dataset_hold_obj(dp
, val
, FTAG
, &ds
));
2578 /* log before we change the name */
2579 spa_history_log_internal_ds(ds
, "rename", tx
,
2580 "-> @%s", ddrsa
->ddrsa_newsnapname
);
2582 VERIFY0(dsl_dataset_snap_remove(hds
, ddrsa
->ddrsa_oldsnapname
, tx
,
2584 mutex_enter(&ds
->ds_lock
);
2585 (void) strcpy(ds
->ds_snapname
, ddrsa
->ddrsa_newsnapname
);
2586 mutex_exit(&ds
->ds_lock
);
2587 VERIFY0(zap_add(dp
->dp_meta_objset
,
2588 dsl_dataset_phys(hds
)->ds_snapnames_zapobj
,
2589 ds
->ds_snapname
, 8, 1, &ds
->ds_object
, tx
));
2591 dsl_dataset_rele(ds
, FTAG
);
2596 dsl_dataset_rename_snapshot_sync(void *arg
, dmu_tx_t
*tx
)
2598 dsl_dataset_rename_snapshot_arg_t
*ddrsa
= arg
;
2599 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
2602 VERIFY0(dsl_dataset_hold(dp
, ddrsa
->ddrsa_fsname
, FTAG
, &hds
));
2603 ddrsa
->ddrsa_tx
= tx
;
2604 if (ddrsa
->ddrsa_recursive
) {
2605 VERIFY0(dmu_objset_find_dp(dp
, hds
->ds_dir
->dd_object
,
2606 dsl_dataset_rename_snapshot_sync_impl
, ddrsa
,
2609 VERIFY0(dsl_dataset_rename_snapshot_sync_impl(dp
, hds
, ddrsa
));
2611 dsl_dataset_rele(hds
, FTAG
);
2615 dsl_dataset_rename_snapshot(const char *fsname
,
2616 const char *oldsnapname
, const char *newsnapname
, boolean_t recursive
)
2618 dsl_dataset_rename_snapshot_arg_t ddrsa
;
2620 ddrsa
.ddrsa_fsname
= fsname
;
2621 ddrsa
.ddrsa_oldsnapname
= oldsnapname
;
2622 ddrsa
.ddrsa_newsnapname
= newsnapname
;
2623 ddrsa
.ddrsa_recursive
= recursive
;
2625 return (dsl_sync_task(fsname
, dsl_dataset_rename_snapshot_check
,
2626 dsl_dataset_rename_snapshot_sync
, &ddrsa
,
2627 1, ZFS_SPACE_CHECK_RESERVED
));
2631 * If we're doing an ownership handoff, we need to make sure that there is
2632 * only one long hold on the dataset. We're not allowed to change anything here
2633 * so we don't permanently release the long hold or regular hold here. We want
2634 * to do this only when syncing to avoid the dataset unexpectedly going away
2635 * when we release the long hold.
2638 dsl_dataset_handoff_check(dsl_dataset_t
*ds
, void *owner
, dmu_tx_t
*tx
)
2642 if (!dmu_tx_is_syncing(tx
))
2645 if (owner
!= NULL
) {
2646 VERIFY3P(ds
->ds_owner
, ==, owner
);
2647 dsl_dataset_long_rele(ds
, owner
);
2650 held
= dsl_dataset_long_held(ds
);
2653 dsl_dataset_long_hold(ds
, owner
);
2656 return (SET_ERROR(EBUSY
));
2662 dsl_dataset_rollback_check(void *arg
, dmu_tx_t
*tx
)
2664 dsl_dataset_rollback_arg_t
*ddra
= arg
;
2665 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
2667 int64_t unused_refres_delta
;
2670 error
= dsl_dataset_hold(dp
, ddra
->ddra_fsname
, FTAG
, &ds
);
2674 /* must not be a snapshot */
2675 if (ds
->ds_is_snapshot
) {
2676 dsl_dataset_rele(ds
, FTAG
);
2677 return (SET_ERROR(EINVAL
));
2680 /* must have a most recent snapshot */
2681 if (dsl_dataset_phys(ds
)->ds_prev_snap_txg
< TXG_INITIAL
) {
2682 dsl_dataset_rele(ds
, FTAG
);
2683 return (SET_ERROR(ESRCH
));
2687 * No rollback to a snapshot created in the current txg, because
2688 * the rollback may dirty the dataset and create blocks that are
2689 * not reachable from the rootbp while having a birth txg that
2690 * falls into the snapshot's range.
2692 if (dmu_tx_is_syncing(tx
) &&
2693 dsl_dataset_phys(ds
)->ds_prev_snap_txg
>= tx
->tx_txg
) {
2694 dsl_dataset_rele(ds
, FTAG
);
2695 return (SET_ERROR(EAGAIN
));
2699 * If the expected target snapshot is specified, then check that
2700 * the latest snapshot is it.
2702 if (ddra
->ddra_tosnap
!= NULL
) {
2703 dsl_dataset_t
*snapds
;
2705 /* Check if the target snapshot exists at all. */
2706 error
= dsl_dataset_hold(dp
, ddra
->ddra_tosnap
, FTAG
, &snapds
);
2709 * ESRCH is used to signal that the target snapshot does
2710 * not exist, while ENOENT is used to report that
2711 * the rolled back dataset does not exist.
2712 * ESRCH is also used to cover other cases where the
2713 * target snapshot is not related to the dataset being
2714 * rolled back such as being in a different pool.
2716 if (error
== ENOENT
|| error
== EXDEV
)
2717 error
= SET_ERROR(ESRCH
);
2718 dsl_dataset_rele(ds
, FTAG
);
2721 ASSERT(snapds
->ds_is_snapshot
);
2723 /* Check if the snapshot is the latest snapshot indeed. */
2724 if (snapds
!= ds
->ds_prev
) {
2726 * Distinguish between the case where the only problem
2727 * is intervening snapshots (EEXIST) vs the snapshot
2728 * not being a valid target for rollback (ESRCH).
2730 if (snapds
->ds_dir
== ds
->ds_dir
||
2731 (dsl_dir_is_clone(ds
->ds_dir
) &&
2732 dsl_dir_phys(ds
->ds_dir
)->dd_origin_obj
==
2733 snapds
->ds_object
)) {
2734 error
= SET_ERROR(EEXIST
);
2736 error
= SET_ERROR(ESRCH
);
2738 dsl_dataset_rele(snapds
, FTAG
);
2739 dsl_dataset_rele(ds
, FTAG
);
2742 dsl_dataset_rele(snapds
, FTAG
);
2745 /* must not have any bookmarks after the most recent snapshot */
2746 nvlist_t
*proprequest
= fnvlist_alloc();
2747 fnvlist_add_boolean(proprequest
, zfs_prop_to_name(ZFS_PROP_CREATETXG
));
2748 nvlist_t
*bookmarks
= fnvlist_alloc();
2749 error
= dsl_get_bookmarks_impl(ds
, proprequest
, bookmarks
);
2750 fnvlist_free(proprequest
);
2752 dsl_dataset_rele(ds
, FTAG
);
2755 for (nvpair_t
*pair
= nvlist_next_nvpair(bookmarks
, NULL
);
2756 pair
!= NULL
; pair
= nvlist_next_nvpair(bookmarks
, pair
)) {
2758 fnvlist_lookup_nvlist(fnvpair_value_nvlist(pair
),
2759 zfs_prop_to_name(ZFS_PROP_CREATETXG
));
2760 uint64_t createtxg
= fnvlist_lookup_uint64(valuenv
, "value");
2761 if (createtxg
> dsl_dataset_phys(ds
)->ds_prev_snap_txg
) {
2762 fnvlist_free(bookmarks
);
2763 dsl_dataset_rele(ds
, FTAG
);
2764 return (SET_ERROR(EEXIST
));
2767 fnvlist_free(bookmarks
);
2769 error
= dsl_dataset_handoff_check(ds
, ddra
->ddra_owner
, tx
);
2771 dsl_dataset_rele(ds
, FTAG
);
2776 * Check if the snap we are rolling back to uses more than
2779 if (ds
->ds_quota
!= 0 &&
2780 dsl_dataset_phys(ds
->ds_prev
)->ds_referenced_bytes
> ds
->ds_quota
) {
2781 dsl_dataset_rele(ds
, FTAG
);
2782 return (SET_ERROR(EDQUOT
));
2786 * When we do the clone swap, we will temporarily use more space
2787 * due to the refreservation (the head will no longer have any
2788 * unique space, so the entire amount of the refreservation will need
2789 * to be free). We will immediately destroy the clone, freeing
2790 * this space, but the freeing happens over many txg's.
2792 unused_refres_delta
= (int64_t)MIN(ds
->ds_reserved
,
2793 dsl_dataset_phys(ds
)->ds_unique_bytes
);
2795 if (unused_refres_delta
> 0 &&
2796 unused_refres_delta
>
2797 dsl_dir_space_available(ds
->ds_dir
, NULL
, 0, TRUE
)) {
2798 dsl_dataset_rele(ds
, FTAG
);
2799 return (SET_ERROR(ENOSPC
));
2802 dsl_dataset_rele(ds
, FTAG
);
2807 dsl_dataset_rollback_sync(void *arg
, dmu_tx_t
*tx
)
2809 dsl_dataset_rollback_arg_t
*ddra
= arg
;
2810 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
2811 dsl_dataset_t
*ds
, *clone
;
2813 char namebuf
[ZFS_MAX_DATASET_NAME_LEN
];
2815 VERIFY0(dsl_dataset_hold(dp
, ddra
->ddra_fsname
, FTAG
, &ds
));
2817 dsl_dataset_name(ds
->ds_prev
, namebuf
);
2818 fnvlist_add_string(ddra
->ddra_result
, "target", namebuf
);
2820 cloneobj
= dsl_dataset_create_sync(ds
->ds_dir
, "%rollback",
2821 ds
->ds_prev
, DS_CREATE_FLAG_NODIRTY
, kcred
, NULL
, tx
);
2823 VERIFY0(dsl_dataset_hold_obj(dp
, cloneobj
, FTAG
, &clone
));
2825 dsl_dataset_clone_swap_sync_impl(clone
, ds
, tx
);
2826 dsl_dataset_zero_zil(ds
, tx
);
2828 dsl_destroy_head_sync_impl(clone
, tx
);
2830 dsl_dataset_rele(clone
, FTAG
);
2831 dsl_dataset_rele(ds
, FTAG
);
2835 * Rolls back the given filesystem or volume to the most recent snapshot.
2836 * The name of the most recent snapshot will be returned under key "target"
2837 * in the result nvlist.
2840 * - The existing dataset MUST be owned by the specified owner at entry
2841 * - Upon return, dataset will still be held by the same owner, whether we
2844 * This mode is required any time the existing filesystem is mounted. See
2845 * notes above zfs_suspend_fs() for further details.
2848 dsl_dataset_rollback(const char *fsname
, const char *tosnap
, void *owner
,
2851 dsl_dataset_rollback_arg_t ddra
;
2853 ddra
.ddra_fsname
= fsname
;
2854 ddra
.ddra_tosnap
= tosnap
;
2855 ddra
.ddra_owner
= owner
;
2856 ddra
.ddra_result
= result
;
2858 return (dsl_sync_task(fsname
, dsl_dataset_rollback_check
,
2859 dsl_dataset_rollback_sync
, &ddra
,
2860 1, ZFS_SPACE_CHECK_RESERVED
));
2863 struct promotenode
{
2868 static int snaplist_space(list_t
*l
, uint64_t mintxg
, uint64_t *spacep
);
2869 static int promote_hold(dsl_dataset_promote_arg_t
*ddpa
, dsl_pool_t
*dp
,
2871 static void promote_rele(dsl_dataset_promote_arg_t
*ddpa
, void *tag
);
2874 dsl_dataset_promote_check(void *arg
, dmu_tx_t
*tx
)
2876 dsl_dataset_promote_arg_t
*ddpa
= arg
;
2877 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
2879 struct promotenode
*snap
;
2880 dsl_dataset_t
*origin_ds
;
2884 size_t max_snap_len
;
2885 boolean_t conflicting_snaps
;
2887 err
= promote_hold(ddpa
, dp
, FTAG
);
2891 hds
= ddpa
->ddpa_clone
;
2892 snap
= list_head(&ddpa
->shared_snaps
);
2893 origin_ds
= snap
->ds
;
2894 max_snap_len
= MAXNAMELEN
- strlen(ddpa
->ddpa_clonename
) - 1;
2896 snap
= list_head(&ddpa
->origin_snaps
);
2898 if (dsl_dataset_phys(hds
)->ds_flags
& DS_FLAG_NOPROMOTE
) {
2899 promote_rele(ddpa
, FTAG
);
2900 return (SET_ERROR(EXDEV
));
2903 snap
= list_head(&ddpa
->shared_snaps
);
2905 err
= SET_ERROR(ENOENT
);
2908 origin_ds
= snap
->ds
;
2911 * Encrypted clones share a DSL Crypto Key with their origin's dsl dir.
2912 * When doing a promote we must make sure the encryption root for
2913 * both the target and the target's origin does not change to avoid
2914 * needing to rewrap encryption keys
2916 err
= dsl_dataset_promote_crypt_check(hds
->ds_dir
, origin_ds
->ds_dir
);
2921 * Compute and check the amount of space to transfer. Since this is
2922 * so expensive, don't do the preliminary check.
2924 if (!dmu_tx_is_syncing(tx
)) {
2925 promote_rele(ddpa
, FTAG
);
2929 /* compute origin's new unique space */
2930 snap
= list_tail(&ddpa
->clone_snaps
);
2931 ASSERT3U(dsl_dataset_phys(snap
->ds
)->ds_prev_snap_obj
, ==,
2932 origin_ds
->ds_object
);
2933 dsl_deadlist_space_range(&snap
->ds
->ds_deadlist
,
2934 dsl_dataset_phys(origin_ds
)->ds_prev_snap_txg
, UINT64_MAX
,
2935 &ddpa
->unique
, &unused
, &unused
);
2938 * Walk the snapshots that we are moving
2940 * Compute space to transfer. Consider the incremental changes
2941 * to used by each snapshot:
2942 * (my used) = (prev's used) + (blocks born) - (blocks killed)
2943 * So each snapshot gave birth to:
2944 * (blocks born) = (my used) - (prev's used) + (blocks killed)
2945 * So a sequence would look like:
2946 * (uN - u(N-1) + kN) + ... + (u1 - u0 + k1) + (u0 - 0 + k0)
2947 * Which simplifies to:
2948 * uN + kN + kN-1 + ... + k1 + k0
2949 * Note however, if we stop before we reach the ORIGIN we get:
2950 * uN + kN + kN-1 + ... + kM - uM-1
2952 conflicting_snaps
= B_FALSE
;
2954 ddpa
->used
= dsl_dataset_phys(origin_ds
)->ds_referenced_bytes
;
2955 ddpa
->comp
= dsl_dataset_phys(origin_ds
)->ds_compressed_bytes
;
2956 ddpa
->uncomp
= dsl_dataset_phys(origin_ds
)->ds_uncompressed_bytes
;
2957 for (snap
= list_head(&ddpa
->shared_snaps
); snap
;
2958 snap
= list_next(&ddpa
->shared_snaps
, snap
)) {
2959 uint64_t val
, dlused
, dlcomp
, dluncomp
;
2960 dsl_dataset_t
*ds
= snap
->ds
;
2965 * If there are long holds, we won't be able to evict
2968 if (dsl_dataset_long_held(ds
)) {
2969 err
= SET_ERROR(EBUSY
);
2973 /* Check that the snapshot name does not conflict */
2974 VERIFY0(dsl_dataset_get_snapname(ds
));
2975 if (strlen(ds
->ds_snapname
) >= max_snap_len
) {
2976 err
= SET_ERROR(ENAMETOOLONG
);
2979 err
= dsl_dataset_snap_lookup(hds
, ds
->ds_snapname
, &val
);
2981 fnvlist_add_boolean(ddpa
->err_ds
,
2982 snap
->ds
->ds_snapname
);
2983 conflicting_snaps
= B_TRUE
;
2984 } else if (err
!= ENOENT
) {
2988 /* The very first snapshot does not have a deadlist */
2989 if (dsl_dataset_phys(ds
)->ds_prev_snap_obj
== 0)
2992 dsl_deadlist_space(&ds
->ds_deadlist
,
2993 &dlused
, &dlcomp
, &dluncomp
);
2994 ddpa
->used
+= dlused
;
2995 ddpa
->comp
+= dlcomp
;
2996 ddpa
->uncomp
+= dluncomp
;
3000 * In order to return the full list of conflicting snapshots, we check
3001 * whether there was a conflict after traversing all of them.
3003 if (conflicting_snaps
) {
3004 err
= SET_ERROR(EEXIST
);
3009 * If we are a clone of a clone then we never reached ORIGIN,
3010 * so we need to subtract out the clone origin's used space.
3012 if (ddpa
->origin_origin
) {
3014 dsl_dataset_phys(ddpa
->origin_origin
)->ds_referenced_bytes
;
3016 dsl_dataset_phys(ddpa
->origin_origin
)->ds_compressed_bytes
;
3018 dsl_dataset_phys(ddpa
->origin_origin
)->
3019 ds_uncompressed_bytes
;
3022 /* Check that there is enough space and limit headroom here */
3023 err
= dsl_dir_transfer_possible(origin_ds
->ds_dir
, hds
->ds_dir
,
3024 0, ss_mv_cnt
, ddpa
->used
, ddpa
->cr
);
3029 * Compute the amounts of space that will be used by snapshots
3030 * after the promotion (for both origin and clone). For each,
3031 * it is the amount of space that will be on all of their
3032 * deadlists (that was not born before their new origin).
3034 if (dsl_dir_phys(hds
->ds_dir
)->dd_flags
& DD_FLAG_USED_BREAKDOWN
) {
3038 * Note, typically this will not be a clone of a clone,
3039 * so dd_origin_txg will be < TXG_INITIAL, so
3040 * these snaplist_space() -> dsl_deadlist_space_range()
3041 * calls will be fast because they do not have to
3042 * iterate over all bps.
3044 snap
= list_head(&ddpa
->origin_snaps
);
3045 err
= snaplist_space(&ddpa
->shared_snaps
,
3046 snap
->ds
->ds_dir
->dd_origin_txg
, &ddpa
->cloneusedsnap
);
3050 err
= snaplist_space(&ddpa
->clone_snaps
,
3051 snap
->ds
->ds_dir
->dd_origin_txg
, &space
);
3054 ddpa
->cloneusedsnap
+= space
;
3056 if (dsl_dir_phys(origin_ds
->ds_dir
)->dd_flags
&
3057 DD_FLAG_USED_BREAKDOWN
) {
3058 err
= snaplist_space(&ddpa
->origin_snaps
,
3059 dsl_dataset_phys(origin_ds
)->ds_creation_txg
,
3060 &ddpa
->originusedsnap
);
3066 promote_rele(ddpa
, FTAG
);
3071 dsl_dataset_promote_sync(void *arg
, dmu_tx_t
*tx
)
3073 dsl_dataset_promote_arg_t
*ddpa
= arg
;
3074 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
3076 struct promotenode
*snap
;
3077 dsl_dataset_t
*origin_ds
;
3078 dsl_dataset_t
*origin_head
;
3080 dsl_dir_t
*odd
= NULL
;
3081 uint64_t oldnext_obj
;
3084 VERIFY0(promote_hold(ddpa
, dp
, FTAG
));
3085 hds
= ddpa
->ddpa_clone
;
3087 ASSERT0(dsl_dataset_phys(hds
)->ds_flags
& DS_FLAG_NOPROMOTE
);
3089 snap
= list_head(&ddpa
->shared_snaps
);
3090 origin_ds
= snap
->ds
;
3093 snap
= list_head(&ddpa
->origin_snaps
);
3094 origin_head
= snap
->ds
;
3097 * We need to explicitly open odd, since origin_ds's dd will be
3100 VERIFY0(dsl_dir_hold_obj(dp
, origin_ds
->ds_dir
->dd_object
,
3103 dsl_dataset_promote_crypt_sync(hds
->ds_dir
, odd
, tx
);
3105 /* change origin's next snap */
3106 dmu_buf_will_dirty(origin_ds
->ds_dbuf
, tx
);
3107 oldnext_obj
= dsl_dataset_phys(origin_ds
)->ds_next_snap_obj
;
3108 snap
= list_tail(&ddpa
->clone_snaps
);
3109 ASSERT3U(dsl_dataset_phys(snap
->ds
)->ds_prev_snap_obj
, ==,
3110 origin_ds
->ds_object
);
3111 dsl_dataset_phys(origin_ds
)->ds_next_snap_obj
= snap
->ds
->ds_object
;
3113 /* change the origin's next clone */
3114 if (dsl_dataset_phys(origin_ds
)->ds_next_clones_obj
) {
3115 dsl_dataset_remove_from_next_clones(origin_ds
,
3116 snap
->ds
->ds_object
, tx
);
3117 VERIFY0(zap_add_int(dp
->dp_meta_objset
,
3118 dsl_dataset_phys(origin_ds
)->ds_next_clones_obj
,
3123 dmu_buf_will_dirty(dd
->dd_dbuf
, tx
);
3124 ASSERT3U(dsl_dir_phys(dd
)->dd_origin_obj
, ==, origin_ds
->ds_object
);
3125 dsl_dir_phys(dd
)->dd_origin_obj
= dsl_dir_phys(odd
)->dd_origin_obj
;
3126 dd
->dd_origin_txg
= origin_head
->ds_dir
->dd_origin_txg
;
3127 dmu_buf_will_dirty(odd
->dd_dbuf
, tx
);
3128 dsl_dir_phys(odd
)->dd_origin_obj
= origin_ds
->ds_object
;
3129 origin_head
->ds_dir
->dd_origin_txg
=
3130 dsl_dataset_phys(origin_ds
)->ds_creation_txg
;
3132 /* change dd_clone entries */
3133 if (spa_version(dp
->dp_spa
) >= SPA_VERSION_DIR_CLONES
) {
3134 VERIFY0(zap_remove_int(dp
->dp_meta_objset
,
3135 dsl_dir_phys(odd
)->dd_clones
, hds
->ds_object
, tx
));
3136 VERIFY0(zap_add_int(dp
->dp_meta_objset
,
3137 dsl_dir_phys(ddpa
->origin_origin
->ds_dir
)->dd_clones
,
3138 hds
->ds_object
, tx
));
3140 VERIFY0(zap_remove_int(dp
->dp_meta_objset
,
3141 dsl_dir_phys(ddpa
->origin_origin
->ds_dir
)->dd_clones
,
3142 origin_head
->ds_object
, tx
));
3143 if (dsl_dir_phys(dd
)->dd_clones
== 0) {
3144 dsl_dir_phys(dd
)->dd_clones
=
3145 zap_create(dp
->dp_meta_objset
, DMU_OT_DSL_CLONES
,
3146 DMU_OT_NONE
, 0, tx
);
3148 VERIFY0(zap_add_int(dp
->dp_meta_objset
,
3149 dsl_dir_phys(dd
)->dd_clones
, origin_head
->ds_object
, tx
));
3152 /* move snapshots to this dir */
3153 for (snap
= list_head(&ddpa
->shared_snaps
); snap
;
3154 snap
= list_next(&ddpa
->shared_snaps
, snap
)) {
3155 dsl_dataset_t
*ds
= snap
->ds
;
3158 * Property callbacks are registered to a particular
3159 * dsl_dir. Since ours is changing, evict the objset
3160 * so that they will be unregistered from the old dsl_dir.
3162 if (ds
->ds_objset
) {
3163 dmu_objset_evict(ds
->ds_objset
);
3164 ds
->ds_objset
= NULL
;
3167 /* move snap name entry */
3168 VERIFY0(dsl_dataset_get_snapname(ds
));
3169 VERIFY0(dsl_dataset_snap_remove(origin_head
,
3170 ds
->ds_snapname
, tx
, B_TRUE
));
3171 VERIFY0(zap_add(dp
->dp_meta_objset
,
3172 dsl_dataset_phys(hds
)->ds_snapnames_zapobj
, ds
->ds_snapname
,
3173 8, 1, &ds
->ds_object
, tx
));
3174 dsl_fs_ss_count_adjust(hds
->ds_dir
, 1,
3175 DD_FIELD_SNAPSHOT_COUNT
, tx
);
3177 /* change containing dsl_dir */
3178 dmu_buf_will_dirty(ds
->ds_dbuf
, tx
);
3179 ASSERT3U(dsl_dataset_phys(ds
)->ds_dir_obj
, ==, odd
->dd_object
);
3180 dsl_dataset_phys(ds
)->ds_dir_obj
= dd
->dd_object
;
3181 ASSERT3P(ds
->ds_dir
, ==, odd
);
3182 dsl_dir_rele(ds
->ds_dir
, ds
);
3183 VERIFY0(dsl_dir_hold_obj(dp
, dd
->dd_object
,
3184 NULL
, ds
, &ds
->ds_dir
));
3186 /* move any clone references */
3187 if (dsl_dataset_phys(ds
)->ds_next_clones_obj
&&
3188 spa_version(dp
->dp_spa
) >= SPA_VERSION_DIR_CLONES
) {
3192 for (zap_cursor_init(&zc
, dp
->dp_meta_objset
,
3193 dsl_dataset_phys(ds
)->ds_next_clones_obj
);
3194 zap_cursor_retrieve(&zc
, &za
) == 0;
3195 zap_cursor_advance(&zc
)) {
3196 dsl_dataset_t
*cnds
;
3199 if (za
.za_first_integer
== oldnext_obj
) {
3201 * We've already moved the
3202 * origin's reference.
3207 VERIFY0(dsl_dataset_hold_obj(dp
,
3208 za
.za_first_integer
, FTAG
, &cnds
));
3209 o
= dsl_dir_phys(cnds
->ds_dir
)->
3210 dd_head_dataset_obj
;
3212 VERIFY0(zap_remove_int(dp
->dp_meta_objset
,
3213 dsl_dir_phys(odd
)->dd_clones
, o
, tx
));
3214 VERIFY0(zap_add_int(dp
->dp_meta_objset
,
3215 dsl_dir_phys(dd
)->dd_clones
, o
, tx
));
3216 dsl_dataset_rele(cnds
, FTAG
);
3218 zap_cursor_fini(&zc
);
3221 ASSERT(!dsl_prop_hascb(ds
));
3225 * Change space accounting.
3226 * Note, pa->*usedsnap and dd_used_breakdown[SNAP] will either
3227 * both be valid, or both be 0 (resulting in delta == 0). This
3228 * is true for each of {clone,origin} independently.
3231 delta
= ddpa
->cloneusedsnap
-
3232 dsl_dir_phys(dd
)->dd_used_breakdown
[DD_USED_SNAP
];
3233 ASSERT3S(delta
, >=, 0);
3234 ASSERT3U(ddpa
->used
, >=, delta
);
3235 dsl_dir_diduse_space(dd
, DD_USED_SNAP
, delta
, 0, 0, tx
);
3236 dsl_dir_diduse_space(dd
, DD_USED_HEAD
,
3237 ddpa
->used
- delta
, ddpa
->comp
, ddpa
->uncomp
, tx
);
3239 delta
= ddpa
->originusedsnap
-
3240 dsl_dir_phys(odd
)->dd_used_breakdown
[DD_USED_SNAP
];
3241 ASSERT3S(delta
, <=, 0);
3242 ASSERT3U(ddpa
->used
, >=, -delta
);
3243 dsl_dir_diduse_space(odd
, DD_USED_SNAP
, delta
, 0, 0, tx
);
3244 dsl_dir_diduse_space(odd
, DD_USED_HEAD
,
3245 -ddpa
->used
- delta
, -ddpa
->comp
, -ddpa
->uncomp
, tx
);
3247 dsl_dataset_phys(origin_ds
)->ds_unique_bytes
= ddpa
->unique
;
3249 /* log history record */
3250 spa_history_log_internal_ds(hds
, "promote", tx
, "");
3252 dsl_dir_rele(odd
, FTAG
);
3253 promote_rele(ddpa
, FTAG
);
3257 * Make a list of dsl_dataset_t's for the snapshots between first_obj
3258 * (exclusive) and last_obj (inclusive). The list will be in reverse
3259 * order (last_obj will be the list_head()). If first_obj == 0, do all
3260 * snapshots back to this dataset's origin.
3263 snaplist_make(dsl_pool_t
*dp
,
3264 uint64_t first_obj
, uint64_t last_obj
, list_t
*l
, void *tag
)
3266 uint64_t obj
= last_obj
;
3268 list_create(l
, sizeof (struct promotenode
),
3269 offsetof(struct promotenode
, link
));
3271 while (obj
!= first_obj
) {
3273 struct promotenode
*snap
;
3276 err
= dsl_dataset_hold_obj(dp
, obj
, tag
, &ds
);
3277 ASSERT(err
!= ENOENT
);
3282 first_obj
= dsl_dir_phys(ds
->ds_dir
)->dd_origin_obj
;
3284 snap
= kmem_alloc(sizeof (*snap
), KM_SLEEP
);
3286 list_insert_tail(l
, snap
);
3287 obj
= dsl_dataset_phys(ds
)->ds_prev_snap_obj
;
3294 snaplist_space(list_t
*l
, uint64_t mintxg
, uint64_t *spacep
)
3296 struct promotenode
*snap
;
3299 for (snap
= list_head(l
); snap
; snap
= list_next(l
, snap
)) {
3300 uint64_t used
, comp
, uncomp
;
3301 dsl_deadlist_space_range(&snap
->ds
->ds_deadlist
,
3302 mintxg
, UINT64_MAX
, &used
, &comp
, &uncomp
);
3309 snaplist_destroy(list_t
*l
, void *tag
)
3311 struct promotenode
*snap
;
3313 if (l
== NULL
|| !list_link_active(&l
->list_head
))
3316 while ((snap
= list_tail(l
)) != NULL
) {
3317 list_remove(l
, snap
);
3318 dsl_dataset_rele(snap
->ds
, tag
);
3319 kmem_free(snap
, sizeof (*snap
));
3325 promote_hold(dsl_dataset_promote_arg_t
*ddpa
, dsl_pool_t
*dp
, void *tag
)
3329 struct promotenode
*snap
;
3331 error
= dsl_dataset_hold(dp
, ddpa
->ddpa_clonename
, tag
,
3335 dd
= ddpa
->ddpa_clone
->ds_dir
;
3337 if (ddpa
->ddpa_clone
->ds_is_snapshot
||
3338 !dsl_dir_is_clone(dd
)) {
3339 dsl_dataset_rele(ddpa
->ddpa_clone
, tag
);
3340 return (SET_ERROR(EINVAL
));
3343 error
= snaplist_make(dp
, 0, dsl_dir_phys(dd
)->dd_origin_obj
,
3344 &ddpa
->shared_snaps
, tag
);
3348 error
= snaplist_make(dp
, 0, ddpa
->ddpa_clone
->ds_object
,
3349 &ddpa
->clone_snaps
, tag
);
3353 snap
= list_head(&ddpa
->shared_snaps
);
3354 ASSERT3U(snap
->ds
->ds_object
, ==, dsl_dir_phys(dd
)->dd_origin_obj
);
3355 error
= snaplist_make(dp
, dsl_dir_phys(dd
)->dd_origin_obj
,
3356 dsl_dir_phys(snap
->ds
->ds_dir
)->dd_head_dataset_obj
,
3357 &ddpa
->origin_snaps
, tag
);
3361 if (dsl_dir_phys(snap
->ds
->ds_dir
)->dd_origin_obj
!= 0) {
3362 error
= dsl_dataset_hold_obj(dp
,
3363 dsl_dir_phys(snap
->ds
->ds_dir
)->dd_origin_obj
,
3364 tag
, &ddpa
->origin_origin
);
3370 promote_rele(ddpa
, tag
);
3375 promote_rele(dsl_dataset_promote_arg_t
*ddpa
, void *tag
)
3377 snaplist_destroy(&ddpa
->shared_snaps
, tag
);
3378 snaplist_destroy(&ddpa
->clone_snaps
, tag
);
3379 snaplist_destroy(&ddpa
->origin_snaps
, tag
);
3380 if (ddpa
->origin_origin
!= NULL
)
3381 dsl_dataset_rele(ddpa
->origin_origin
, tag
);
3382 dsl_dataset_rele(ddpa
->ddpa_clone
, tag
);
3388 * If it fails due to a conflicting snapshot name, "conflsnap" will be filled
3389 * in with the name. (It must be at least ZFS_MAX_DATASET_NAME_LEN bytes long.)
3392 dsl_dataset_promote(const char *name
, char *conflsnap
)
3394 dsl_dataset_promote_arg_t ddpa
= { 0 };
3397 nvpair_t
*snap_pair
;
3401 * We will modify space proportional to the number of
3402 * snapshots. Compute numsnaps.
3404 error
= dmu_objset_hold(name
, FTAG
, &os
);
3407 error
= zap_count(dmu_objset_pool(os
)->dp_meta_objset
,
3408 dsl_dataset_phys(dmu_objset_ds(os
))->ds_snapnames_zapobj
,
3410 dmu_objset_rele(os
, FTAG
);
3414 ddpa
.ddpa_clonename
= name
;
3415 ddpa
.err_ds
= fnvlist_alloc();
3418 error
= dsl_sync_task(name
, dsl_dataset_promote_check
,
3419 dsl_dataset_promote_sync
, &ddpa
,
3420 2 + numsnaps
, ZFS_SPACE_CHECK_RESERVED
);
3423 * Return the first conflicting snapshot found.
3425 snap_pair
= nvlist_next_nvpair(ddpa
.err_ds
, NULL
);
3426 if (snap_pair
!= NULL
&& conflsnap
!= NULL
)
3427 (void) strcpy(conflsnap
, nvpair_name(snap_pair
));
3429 fnvlist_free(ddpa
.err_ds
);
3434 dsl_dataset_clone_swap_check_impl(dsl_dataset_t
*clone
,
3435 dsl_dataset_t
*origin_head
, boolean_t force
, void *owner
, dmu_tx_t
*tx
)
3438 * "slack" factor for received datasets with refquota set on them.
3439 * See the bottom of this function for details on its use.
3441 uint64_t refquota_slack
= DMU_MAX_ACCESS
* spa_asize_inflation
;
3442 int64_t unused_refres_delta
;
3444 /* they should both be heads */
3445 if (clone
->ds_is_snapshot
||
3446 origin_head
->ds_is_snapshot
)
3447 return (SET_ERROR(EINVAL
));
3449 /* if we are not forcing, the branch point should be just before them */
3450 if (!force
&& clone
->ds_prev
!= origin_head
->ds_prev
)
3451 return (SET_ERROR(EINVAL
));
3453 /* clone should be the clone (unless they are unrelated) */
3454 if (clone
->ds_prev
!= NULL
&&
3455 clone
->ds_prev
!= clone
->ds_dir
->dd_pool
->dp_origin_snap
&&
3456 origin_head
->ds_dir
!= clone
->ds_prev
->ds_dir
)
3457 return (SET_ERROR(EINVAL
));
3459 /* the clone should be a child of the origin */
3460 if (clone
->ds_dir
->dd_parent
!= origin_head
->ds_dir
)
3461 return (SET_ERROR(EINVAL
));
3463 /* origin_head shouldn't be modified unless 'force' */
3465 dsl_dataset_modified_since_snap(origin_head
, origin_head
->ds_prev
))
3466 return (SET_ERROR(ETXTBSY
));
3468 /* origin_head should have no long holds (e.g. is not mounted) */
3469 if (dsl_dataset_handoff_check(origin_head
, owner
, tx
))
3470 return (SET_ERROR(EBUSY
));
3472 /* check amount of any unconsumed refreservation */
3473 unused_refres_delta
=
3474 (int64_t)MIN(origin_head
->ds_reserved
,
3475 dsl_dataset_phys(origin_head
)->ds_unique_bytes
) -
3476 (int64_t)MIN(origin_head
->ds_reserved
,
3477 dsl_dataset_phys(clone
)->ds_unique_bytes
);
3479 if (unused_refres_delta
> 0 &&
3480 unused_refres_delta
>
3481 dsl_dir_space_available(origin_head
->ds_dir
, NULL
, 0, TRUE
))
3482 return (SET_ERROR(ENOSPC
));
3485 * The clone can't be too much over the head's refquota.
3487 * To ensure that the entire refquota can be used, we allow one
3488 * transaction to exceed the the refquota. Therefore, this check
3489 * needs to also allow for the space referenced to be more than the
3490 * refquota. The maximum amount of space that one transaction can use
3491 * on disk is DMU_MAX_ACCESS * spa_asize_inflation. Allowing this
3492 * overage ensures that we are able to receive a filesystem that
3493 * exceeds the refquota on the source system.
3495 * So that overage is the refquota_slack we use below.
3497 if (origin_head
->ds_quota
!= 0 &&
3498 dsl_dataset_phys(clone
)->ds_referenced_bytes
>
3499 origin_head
->ds_quota
+ refquota_slack
)
3500 return (SET_ERROR(EDQUOT
));
3506 dsl_dataset_swap_remap_deadlists(dsl_dataset_t
*clone
,
3507 dsl_dataset_t
*origin
, dmu_tx_t
*tx
)
3509 uint64_t clone_remap_dl_obj
, origin_remap_dl_obj
;
3510 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
3512 ASSERT(dsl_pool_sync_context(dp
));
3514 clone_remap_dl_obj
= dsl_dataset_get_remap_deadlist_object(clone
);
3515 origin_remap_dl_obj
= dsl_dataset_get_remap_deadlist_object(origin
);
3517 if (clone_remap_dl_obj
!= 0) {
3518 dsl_deadlist_close(&clone
->ds_remap_deadlist
);
3519 dsl_dataset_unset_remap_deadlist_object(clone
, tx
);
3521 if (origin_remap_dl_obj
!= 0) {
3522 dsl_deadlist_close(&origin
->ds_remap_deadlist
);
3523 dsl_dataset_unset_remap_deadlist_object(origin
, tx
);
3526 if (clone_remap_dl_obj
!= 0) {
3527 dsl_dataset_set_remap_deadlist_object(origin
,
3528 clone_remap_dl_obj
, tx
);
3529 dsl_deadlist_open(&origin
->ds_remap_deadlist
,
3530 dp
->dp_meta_objset
, clone_remap_dl_obj
);
3532 if (origin_remap_dl_obj
!= 0) {
3533 dsl_dataset_set_remap_deadlist_object(clone
,
3534 origin_remap_dl_obj
, tx
);
3535 dsl_deadlist_open(&clone
->ds_remap_deadlist
,
3536 dp
->dp_meta_objset
, origin_remap_dl_obj
);
3541 dsl_dataset_clone_swap_sync_impl(dsl_dataset_t
*clone
,
3542 dsl_dataset_t
*origin_head
, dmu_tx_t
*tx
)
3544 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
3545 int64_t unused_refres_delta
;
3547 ASSERT(clone
->ds_reserved
== 0);
3549 * NOTE: On DEBUG kernels there could be a race between this and
3550 * the check function if spa_asize_inflation is adjusted...
3552 ASSERT(origin_head
->ds_quota
== 0 ||
3553 dsl_dataset_phys(clone
)->ds_unique_bytes
<= origin_head
->ds_quota
+
3554 DMU_MAX_ACCESS
* spa_asize_inflation
);
3555 ASSERT3P(clone
->ds_prev
, ==, origin_head
->ds_prev
);
3558 * Swap per-dataset feature flags.
3560 for (spa_feature_t f
= 0; f
< SPA_FEATURES
; f
++) {
3561 if (!(spa_feature_table
[f
].fi_flags
&
3562 ZFEATURE_FLAG_PER_DATASET
)) {
3563 ASSERT(!clone
->ds_feature_inuse
[f
]);
3564 ASSERT(!origin_head
->ds_feature_inuse
[f
]);
3568 boolean_t clone_inuse
= clone
->ds_feature_inuse
[f
];
3569 boolean_t origin_head_inuse
= origin_head
->ds_feature_inuse
[f
];
3572 dsl_dataset_deactivate_feature(clone
->ds_object
, f
, tx
);
3573 clone
->ds_feature_inuse
[f
] = B_FALSE
;
3575 if (origin_head_inuse
) {
3576 dsl_dataset_deactivate_feature(origin_head
->ds_object
,
3578 origin_head
->ds_feature_inuse
[f
] = B_FALSE
;
3581 dsl_dataset_activate_feature(origin_head
->ds_object
,
3583 origin_head
->ds_feature_inuse
[f
] = B_TRUE
;
3585 if (origin_head_inuse
) {
3586 dsl_dataset_activate_feature(clone
->ds_object
, f
, tx
);
3587 clone
->ds_feature_inuse
[f
] = B_TRUE
;
3591 dmu_buf_will_dirty(clone
->ds_dbuf
, tx
);
3592 dmu_buf_will_dirty(origin_head
->ds_dbuf
, tx
);
3594 if (clone
->ds_objset
!= NULL
) {
3595 dmu_objset_evict(clone
->ds_objset
);
3596 clone
->ds_objset
= NULL
;
3599 if (origin_head
->ds_objset
!= NULL
) {
3600 dmu_objset_evict(origin_head
->ds_objset
);
3601 origin_head
->ds_objset
= NULL
;
3604 unused_refres_delta
=
3605 (int64_t)MIN(origin_head
->ds_reserved
,
3606 dsl_dataset_phys(origin_head
)->ds_unique_bytes
) -
3607 (int64_t)MIN(origin_head
->ds_reserved
,
3608 dsl_dataset_phys(clone
)->ds_unique_bytes
);
3611 * Reset origin's unique bytes, if it exists.
3613 if (clone
->ds_prev
) {
3614 dsl_dataset_t
*origin
= clone
->ds_prev
;
3615 uint64_t comp
, uncomp
;
3617 dmu_buf_will_dirty(origin
->ds_dbuf
, tx
);
3618 dsl_deadlist_space_range(&clone
->ds_deadlist
,
3619 dsl_dataset_phys(origin
)->ds_prev_snap_txg
, UINT64_MAX
,
3620 &dsl_dataset_phys(origin
)->ds_unique_bytes
, &comp
, &uncomp
);
3625 rrw_enter(&clone
->ds_bp_rwlock
, RW_WRITER
, FTAG
);
3626 rrw_enter(&origin_head
->ds_bp_rwlock
, RW_WRITER
, FTAG
);
3628 tmp
= dsl_dataset_phys(origin_head
)->ds_bp
;
3629 dsl_dataset_phys(origin_head
)->ds_bp
=
3630 dsl_dataset_phys(clone
)->ds_bp
;
3631 dsl_dataset_phys(clone
)->ds_bp
= tmp
;
3632 rrw_exit(&origin_head
->ds_bp_rwlock
, FTAG
);
3633 rrw_exit(&clone
->ds_bp_rwlock
, FTAG
);
3636 /* set dd_*_bytes */
3638 int64_t dused
, dcomp
, duncomp
;
3639 uint64_t cdl_used
, cdl_comp
, cdl_uncomp
;
3640 uint64_t odl_used
, odl_comp
, odl_uncomp
;
3642 ASSERT3U(dsl_dir_phys(clone
->ds_dir
)->
3643 dd_used_breakdown
[DD_USED_SNAP
], ==, 0);
3645 dsl_deadlist_space(&clone
->ds_deadlist
,
3646 &cdl_used
, &cdl_comp
, &cdl_uncomp
);
3647 dsl_deadlist_space(&origin_head
->ds_deadlist
,
3648 &odl_used
, &odl_comp
, &odl_uncomp
);
3650 dused
= dsl_dataset_phys(clone
)->ds_referenced_bytes
+
3652 (dsl_dataset_phys(origin_head
)->ds_referenced_bytes
+
3654 dcomp
= dsl_dataset_phys(clone
)->ds_compressed_bytes
+
3656 (dsl_dataset_phys(origin_head
)->ds_compressed_bytes
+
3658 duncomp
= dsl_dataset_phys(clone
)->ds_uncompressed_bytes
+
3660 (dsl_dataset_phys(origin_head
)->ds_uncompressed_bytes
+
3663 dsl_dir_diduse_space(origin_head
->ds_dir
, DD_USED_HEAD
,
3664 dused
, dcomp
, duncomp
, tx
);
3665 dsl_dir_diduse_space(clone
->ds_dir
, DD_USED_HEAD
,
3666 -dused
, -dcomp
, -duncomp
, tx
);
3669 * The difference in the space used by snapshots is the
3670 * difference in snapshot space due to the head's
3671 * deadlist (since that's the only thing that's
3672 * changing that affects the snapused).
3674 dsl_deadlist_space_range(&clone
->ds_deadlist
,
3675 origin_head
->ds_dir
->dd_origin_txg
, UINT64_MAX
,
3676 &cdl_used
, &cdl_comp
, &cdl_uncomp
);
3677 dsl_deadlist_space_range(&origin_head
->ds_deadlist
,
3678 origin_head
->ds_dir
->dd_origin_txg
, UINT64_MAX
,
3679 &odl_used
, &odl_comp
, &odl_uncomp
);
3680 dsl_dir_transfer_space(origin_head
->ds_dir
, cdl_used
- odl_used
,
3681 DD_USED_HEAD
, DD_USED_SNAP
, tx
);
3684 /* swap ds_*_bytes */
3685 SWITCH64(dsl_dataset_phys(origin_head
)->ds_referenced_bytes
,
3686 dsl_dataset_phys(clone
)->ds_referenced_bytes
);
3687 SWITCH64(dsl_dataset_phys(origin_head
)->ds_compressed_bytes
,
3688 dsl_dataset_phys(clone
)->ds_compressed_bytes
);
3689 SWITCH64(dsl_dataset_phys(origin_head
)->ds_uncompressed_bytes
,
3690 dsl_dataset_phys(clone
)->ds_uncompressed_bytes
);
3691 SWITCH64(dsl_dataset_phys(origin_head
)->ds_unique_bytes
,
3692 dsl_dataset_phys(clone
)->ds_unique_bytes
);
3694 /* apply any parent delta for change in unconsumed refreservation */
3695 dsl_dir_diduse_space(origin_head
->ds_dir
, DD_USED_REFRSRV
,
3696 unused_refres_delta
, 0, 0, tx
);
3701 dsl_deadlist_close(&clone
->ds_deadlist
);
3702 dsl_deadlist_close(&origin_head
->ds_deadlist
);
3703 SWITCH64(dsl_dataset_phys(origin_head
)->ds_deadlist_obj
,
3704 dsl_dataset_phys(clone
)->ds_deadlist_obj
);
3705 dsl_deadlist_open(&clone
->ds_deadlist
, dp
->dp_meta_objset
,
3706 dsl_dataset_phys(clone
)->ds_deadlist_obj
);
3707 dsl_deadlist_open(&origin_head
->ds_deadlist
, dp
->dp_meta_objset
,
3708 dsl_dataset_phys(origin_head
)->ds_deadlist_obj
);
3709 dsl_dataset_swap_remap_deadlists(clone
, origin_head
, tx
);
3711 dsl_scan_ds_clone_swapped(origin_head
, clone
, tx
);
3713 spa_history_log_internal_ds(clone
, "clone swap", tx
,
3714 "parent=%s", origin_head
->ds_dir
->dd_myname
);
3718 * Given a pool name and a dataset object number in that pool,
3719 * return the name of that dataset.
3722 dsl_dsobj_to_dsname(char *pname
, uint64_t obj
, char *buf
)
3728 error
= dsl_pool_hold(pname
, FTAG
, &dp
);
3732 error
= dsl_dataset_hold_obj(dp
, obj
, FTAG
, &ds
);
3734 dsl_dataset_name(ds
, buf
);
3735 dsl_dataset_rele(ds
, FTAG
);
3737 dsl_pool_rele(dp
, FTAG
);
3743 dsl_dataset_check_quota(dsl_dataset_t
*ds
, boolean_t check_quota
,
3744 uint64_t asize
, uint64_t inflight
, uint64_t *used
, uint64_t *ref_rsrv
)
3748 ASSERT3S(asize
, >, 0);
3751 * *ref_rsrv is the portion of asize that will come from any
3752 * unconsumed refreservation space.
3756 mutex_enter(&ds
->ds_lock
);
3758 * Make a space adjustment for reserved bytes.
3760 if (ds
->ds_reserved
> dsl_dataset_phys(ds
)->ds_unique_bytes
) {
3762 ds
->ds_reserved
- dsl_dataset_phys(ds
)->ds_unique_bytes
);
3764 (ds
->ds_reserved
- dsl_dataset_phys(ds
)->ds_unique_bytes
);
3766 asize
- MIN(asize
, parent_delta(ds
, asize
+ inflight
));
3769 if (!check_quota
|| ds
->ds_quota
== 0) {
3770 mutex_exit(&ds
->ds_lock
);
3774 * If they are requesting more space, and our current estimate
3775 * is over quota, they get to try again unless the actual
3776 * on-disk is over quota and there are no pending changes (which
3777 * may free up space for us).
3779 if (dsl_dataset_phys(ds
)->ds_referenced_bytes
+ inflight
>=
3782 dsl_dataset_phys(ds
)->ds_referenced_bytes
< ds
->ds_quota
)
3783 error
= SET_ERROR(ERESTART
);
3785 error
= SET_ERROR(EDQUOT
);
3787 mutex_exit(&ds
->ds_lock
);
3792 typedef struct dsl_dataset_set_qr_arg
{
3793 const char *ddsqra_name
;
3794 zprop_source_t ddsqra_source
;
3795 uint64_t ddsqra_value
;
3796 } dsl_dataset_set_qr_arg_t
;
3801 dsl_dataset_set_refquota_check(void *arg
, dmu_tx_t
*tx
)
3803 dsl_dataset_set_qr_arg_t
*ddsqra
= arg
;
3804 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
3809 if (spa_version(dp
->dp_spa
) < SPA_VERSION_REFQUOTA
)
3810 return (SET_ERROR(ENOTSUP
));
3812 error
= dsl_dataset_hold(dp
, ddsqra
->ddsqra_name
, FTAG
, &ds
);
3816 if (ds
->ds_is_snapshot
) {
3817 dsl_dataset_rele(ds
, FTAG
);
3818 return (SET_ERROR(EINVAL
));
3821 error
= dsl_prop_predict(ds
->ds_dir
,
3822 zfs_prop_to_name(ZFS_PROP_REFQUOTA
),
3823 ddsqra
->ddsqra_source
, ddsqra
->ddsqra_value
, &newval
);
3825 dsl_dataset_rele(ds
, FTAG
);
3830 dsl_dataset_rele(ds
, FTAG
);
3834 if (newval
< dsl_dataset_phys(ds
)->ds_referenced_bytes
||
3835 newval
< ds
->ds_reserved
) {
3836 dsl_dataset_rele(ds
, FTAG
);
3837 return (SET_ERROR(ENOSPC
));
3840 dsl_dataset_rele(ds
, FTAG
);
3845 dsl_dataset_set_refquota_sync(void *arg
, dmu_tx_t
*tx
)
3847 dsl_dataset_set_qr_arg_t
*ddsqra
= arg
;
3848 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
3852 VERIFY0(dsl_dataset_hold(dp
, ddsqra
->ddsqra_name
, FTAG
, &ds
));
3854 dsl_prop_set_sync_impl(ds
,
3855 zfs_prop_to_name(ZFS_PROP_REFQUOTA
),
3856 ddsqra
->ddsqra_source
, sizeof (ddsqra
->ddsqra_value
), 1,
3857 &ddsqra
->ddsqra_value
, tx
);
3859 VERIFY0(dsl_prop_get_int_ds(ds
,
3860 zfs_prop_to_name(ZFS_PROP_REFQUOTA
), &newval
));
3862 if (ds
->ds_quota
!= newval
) {
3863 dmu_buf_will_dirty(ds
->ds_dbuf
, tx
);
3864 ds
->ds_quota
= newval
;
3866 dsl_dataset_rele(ds
, FTAG
);
3870 dsl_dataset_set_refquota(const char *dsname
, zprop_source_t source
,
3873 dsl_dataset_set_qr_arg_t ddsqra
;
3875 ddsqra
.ddsqra_name
= dsname
;
3876 ddsqra
.ddsqra_source
= source
;
3877 ddsqra
.ddsqra_value
= refquota
;
3879 return (dsl_sync_task(dsname
, dsl_dataset_set_refquota_check
,
3880 dsl_dataset_set_refquota_sync
, &ddsqra
, 0,
3881 ZFS_SPACE_CHECK_EXTRA_RESERVED
));
3885 dsl_dataset_set_refreservation_check(void *arg
, dmu_tx_t
*tx
)
3887 dsl_dataset_set_qr_arg_t
*ddsqra
= arg
;
3888 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
3891 uint64_t newval
, unique
;
3893 if (spa_version(dp
->dp_spa
) < SPA_VERSION_REFRESERVATION
)
3894 return (SET_ERROR(ENOTSUP
));
3896 error
= dsl_dataset_hold(dp
, ddsqra
->ddsqra_name
, FTAG
, &ds
);
3900 if (ds
->ds_is_snapshot
) {
3901 dsl_dataset_rele(ds
, FTAG
);
3902 return (SET_ERROR(EINVAL
));
3905 error
= dsl_prop_predict(ds
->ds_dir
,
3906 zfs_prop_to_name(ZFS_PROP_REFRESERVATION
),
3907 ddsqra
->ddsqra_source
, ddsqra
->ddsqra_value
, &newval
);
3909 dsl_dataset_rele(ds
, FTAG
);
3914 * If we are doing the preliminary check in open context, the
3915 * space estimates may be inaccurate.
3917 if (!dmu_tx_is_syncing(tx
)) {
3918 dsl_dataset_rele(ds
, FTAG
);
3922 mutex_enter(&ds
->ds_lock
);
3923 if (!DS_UNIQUE_IS_ACCURATE(ds
))
3924 dsl_dataset_recalc_head_uniq(ds
);
3925 unique
= dsl_dataset_phys(ds
)->ds_unique_bytes
;
3926 mutex_exit(&ds
->ds_lock
);
3928 if (MAX(unique
, newval
) > MAX(unique
, ds
->ds_reserved
)) {
3929 uint64_t delta
= MAX(unique
, newval
) -
3930 MAX(unique
, ds
->ds_reserved
);
3933 dsl_dir_space_available(ds
->ds_dir
, NULL
, 0, B_TRUE
) ||
3934 (ds
->ds_quota
> 0 && newval
> ds
->ds_quota
)) {
3935 dsl_dataset_rele(ds
, FTAG
);
3936 return (SET_ERROR(ENOSPC
));
3940 dsl_dataset_rele(ds
, FTAG
);
3945 dsl_dataset_set_refreservation_sync_impl(dsl_dataset_t
*ds
,
3946 zprop_source_t source
, uint64_t value
, dmu_tx_t
*tx
)
3952 dsl_prop_set_sync_impl(ds
, zfs_prop_to_name(ZFS_PROP_REFRESERVATION
),
3953 source
, sizeof (value
), 1, &value
, tx
);
3955 VERIFY0(dsl_prop_get_int_ds(ds
,
3956 zfs_prop_to_name(ZFS_PROP_REFRESERVATION
), &newval
));
3958 dmu_buf_will_dirty(ds
->ds_dbuf
, tx
);
3959 mutex_enter(&ds
->ds_dir
->dd_lock
);
3960 mutex_enter(&ds
->ds_lock
);
3961 ASSERT(DS_UNIQUE_IS_ACCURATE(ds
));
3962 unique
= dsl_dataset_phys(ds
)->ds_unique_bytes
;
3963 delta
= MAX(0, (int64_t)(newval
- unique
)) -
3964 MAX(0, (int64_t)(ds
->ds_reserved
- unique
));
3965 ds
->ds_reserved
= newval
;
3966 mutex_exit(&ds
->ds_lock
);
3968 dsl_dir_diduse_space(ds
->ds_dir
, DD_USED_REFRSRV
, delta
, 0, 0, tx
);
3969 mutex_exit(&ds
->ds_dir
->dd_lock
);
3973 dsl_dataset_set_refreservation_sync(void *arg
, dmu_tx_t
*tx
)
3975 dsl_dataset_set_qr_arg_t
*ddsqra
= arg
;
3976 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
3979 VERIFY0(dsl_dataset_hold(dp
, ddsqra
->ddsqra_name
, FTAG
, &ds
));
3980 dsl_dataset_set_refreservation_sync_impl(ds
,
3981 ddsqra
->ddsqra_source
, ddsqra
->ddsqra_value
, tx
);
3982 dsl_dataset_rele(ds
, FTAG
);
3986 dsl_dataset_set_refreservation(const char *dsname
, zprop_source_t source
,
3987 uint64_t refreservation
)
3989 dsl_dataset_set_qr_arg_t ddsqra
;
3991 ddsqra
.ddsqra_name
= dsname
;
3992 ddsqra
.ddsqra_source
= source
;
3993 ddsqra
.ddsqra_value
= refreservation
;
3995 return (dsl_sync_task(dsname
, dsl_dataset_set_refreservation_check
,
3996 dsl_dataset_set_refreservation_sync
, &ddsqra
, 0,
3997 ZFS_SPACE_CHECK_EXTRA_RESERVED
));
4001 * Return (in *usedp) the amount of space written in new that is not
4002 * present in oldsnap. New may be a snapshot or the head. Old must be
4003 * a snapshot before new, in new's filesystem (or its origin). If not then
4004 * fail and return EINVAL.
4006 * The written space is calculated by considering two components: First, we
4007 * ignore any freed space, and calculate the written as new's used space
4008 * minus old's used space. Next, we add in the amount of space that was freed
4009 * between the two snapshots, thus reducing new's used space relative to old's.
4010 * Specifically, this is the space that was born before old->ds_creation_txg,
4011 * and freed before new (ie. on new's deadlist or a previous deadlist).
4013 * space freed [---------------------]
4014 * snapshots ---O-------O--------O-------O------
4018 dsl_dataset_space_written(dsl_dataset_t
*oldsnap
, dsl_dataset_t
*new,
4019 uint64_t *usedp
, uint64_t *compp
, uint64_t *uncompp
)
4023 dsl_pool_t
*dp
= new->ds_dir
->dd_pool
;
4025 ASSERT(dsl_pool_config_held(dp
));
4028 *usedp
+= dsl_dataset_phys(new)->ds_referenced_bytes
;
4029 *usedp
-= dsl_dataset_phys(oldsnap
)->ds_referenced_bytes
;
4032 *compp
+= dsl_dataset_phys(new)->ds_compressed_bytes
;
4033 *compp
-= dsl_dataset_phys(oldsnap
)->ds_compressed_bytes
;
4036 *uncompp
+= dsl_dataset_phys(new)->ds_uncompressed_bytes
;
4037 *uncompp
-= dsl_dataset_phys(oldsnap
)->ds_uncompressed_bytes
;
4039 snapobj
= new->ds_object
;
4040 while (snapobj
!= oldsnap
->ds_object
) {
4041 dsl_dataset_t
*snap
;
4042 uint64_t used
, comp
, uncomp
;
4044 if (snapobj
== new->ds_object
) {
4047 err
= dsl_dataset_hold_obj(dp
, snapobj
, FTAG
, &snap
);
4052 if (dsl_dataset_phys(snap
)->ds_prev_snap_txg
==
4053 dsl_dataset_phys(oldsnap
)->ds_creation_txg
) {
4055 * The blocks in the deadlist can not be born after
4056 * ds_prev_snap_txg, so get the whole deadlist space,
4057 * which is more efficient (especially for old-format
4058 * deadlists). Unfortunately the deadlist code
4059 * doesn't have enough information to make this
4060 * optimization itself.
4062 dsl_deadlist_space(&snap
->ds_deadlist
,
4063 &used
, &comp
, &uncomp
);
4065 dsl_deadlist_space_range(&snap
->ds_deadlist
,
4066 0, dsl_dataset_phys(oldsnap
)->ds_creation_txg
,
4067 &used
, &comp
, &uncomp
);
4074 * If we get to the beginning of the chain of snapshots
4075 * (ds_prev_snap_obj == 0) before oldsnap, then oldsnap
4076 * was not a snapshot of/before new.
4078 snapobj
= dsl_dataset_phys(snap
)->ds_prev_snap_obj
;
4080 dsl_dataset_rele(snap
, FTAG
);
4082 err
= SET_ERROR(EINVAL
);
4091 * Return (in *usedp) the amount of space that will be reclaimed if firstsnap,
4092 * lastsnap, and all snapshots in between are deleted.
4094 * blocks that would be freed [---------------------------]
4095 * snapshots ---O-------O--------O-------O--------O
4096 * firstsnap lastsnap
4098 * This is the set of blocks that were born after the snap before firstsnap,
4099 * (birth > firstsnap->prev_snap_txg) and died before the snap after the
4100 * last snap (ie, is on lastsnap->ds_next->ds_deadlist or an earlier deadlist).
4101 * We calculate this by iterating over the relevant deadlists (from the snap
4102 * after lastsnap, backward to the snap after firstsnap), summing up the
4103 * space on the deadlist that was born after the snap before firstsnap.
4106 dsl_dataset_space_wouldfree(dsl_dataset_t
*firstsnap
,
4107 dsl_dataset_t
*lastsnap
,
4108 uint64_t *usedp
, uint64_t *compp
, uint64_t *uncompp
)
4112 dsl_pool_t
*dp
= firstsnap
->ds_dir
->dd_pool
;
4114 ASSERT(firstsnap
->ds_is_snapshot
);
4115 ASSERT(lastsnap
->ds_is_snapshot
);
4118 * Check that the snapshots are in the same dsl_dir, and firstsnap
4119 * is before lastsnap.
4121 if (firstsnap
->ds_dir
!= lastsnap
->ds_dir
||
4122 dsl_dataset_phys(firstsnap
)->ds_creation_txg
>
4123 dsl_dataset_phys(lastsnap
)->ds_creation_txg
)
4124 return (SET_ERROR(EINVAL
));
4126 *usedp
= *compp
= *uncompp
= 0;
4128 snapobj
= dsl_dataset_phys(lastsnap
)->ds_next_snap_obj
;
4129 while (snapobj
!= firstsnap
->ds_object
) {
4131 uint64_t used
, comp
, uncomp
;
4133 err
= dsl_dataset_hold_obj(dp
, snapobj
, FTAG
, &ds
);
4137 dsl_deadlist_space_range(&ds
->ds_deadlist
,
4138 dsl_dataset_phys(firstsnap
)->ds_prev_snap_txg
, UINT64_MAX
,
4139 &used
, &comp
, &uncomp
);
4144 snapobj
= dsl_dataset_phys(ds
)->ds_prev_snap_obj
;
4145 ASSERT3U(snapobj
, !=, 0);
4146 dsl_dataset_rele(ds
, FTAG
);
4152 * Return TRUE if 'earlier' is an earlier snapshot in 'later's timeline.
4153 * For example, they could both be snapshots of the same filesystem, and
4154 * 'earlier' is before 'later'. Or 'earlier' could be the origin of
4155 * 'later's filesystem. Or 'earlier' could be an older snapshot in the origin's
4156 * filesystem. Or 'earlier' could be the origin's origin.
4158 * If non-zero, earlier_txg is used instead of earlier's ds_creation_txg.
4161 dsl_dataset_is_before(dsl_dataset_t
*later
, dsl_dataset_t
*earlier
,
4162 uint64_t earlier_txg
)
4164 dsl_pool_t
*dp
= later
->ds_dir
->dd_pool
;
4168 ASSERT(dsl_pool_config_held(dp
));
4169 ASSERT(earlier
->ds_is_snapshot
|| earlier_txg
!= 0);
4171 if (earlier_txg
== 0)
4172 earlier_txg
= dsl_dataset_phys(earlier
)->ds_creation_txg
;
4174 if (later
->ds_is_snapshot
&&
4175 earlier_txg
>= dsl_dataset_phys(later
)->ds_creation_txg
)
4178 if (later
->ds_dir
== earlier
->ds_dir
)
4180 if (!dsl_dir_is_clone(later
->ds_dir
))
4183 if (dsl_dir_phys(later
->ds_dir
)->dd_origin_obj
== earlier
->ds_object
)
4185 dsl_dataset_t
*origin
;
4186 error
= dsl_dataset_hold_obj(dp
,
4187 dsl_dir_phys(later
->ds_dir
)->dd_origin_obj
, FTAG
, &origin
);
4190 ret
= dsl_dataset_is_before(origin
, earlier
, earlier_txg
);
4191 dsl_dataset_rele(origin
, FTAG
);
4196 dsl_dataset_zapify(dsl_dataset_t
*ds
, dmu_tx_t
*tx
)
4198 objset_t
*mos
= ds
->ds_dir
->dd_pool
->dp_meta_objset
;
4199 dmu_object_zapify(mos
, ds
->ds_object
, DMU_OT_DSL_DATASET
, tx
);
4203 dsl_dataset_is_zapified(dsl_dataset_t
*ds
)
4205 dmu_object_info_t doi
;
4207 dmu_object_info_from_db(ds
->ds_dbuf
, &doi
);
4208 return (doi
.doi_type
== DMU_OTN_ZAP_METADATA
);
4212 dsl_dataset_has_resume_receive_state(dsl_dataset_t
*ds
)
4214 return (dsl_dataset_is_zapified(ds
) &&
4215 zap_contains(ds
->ds_dir
->dd_pool
->dp_meta_objset
,
4216 ds
->ds_object
, DS_FIELD_RESUME_TOGUID
) == 0);
4220 dsl_dataset_get_remap_deadlist_object(dsl_dataset_t
*ds
)
4222 uint64_t remap_deadlist_obj
;
4225 if (!dsl_dataset_is_zapified(ds
))
4228 err
= zap_lookup(ds
->ds_dir
->dd_pool
->dp_meta_objset
, ds
->ds_object
,
4229 DS_FIELD_REMAP_DEADLIST
, sizeof (remap_deadlist_obj
), 1,
4230 &remap_deadlist_obj
);
4233 VERIFY3S(err
, ==, ENOENT
);
4237 ASSERT(remap_deadlist_obj
!= 0);
4238 return (remap_deadlist_obj
);
4242 dsl_dataset_remap_deadlist_exists(dsl_dataset_t
*ds
)
4244 EQUIV(dsl_deadlist_is_open(&ds
->ds_remap_deadlist
),
4245 dsl_dataset_get_remap_deadlist_object(ds
) != 0);
4246 return (dsl_deadlist_is_open(&ds
->ds_remap_deadlist
));
4250 dsl_dataset_set_remap_deadlist_object(dsl_dataset_t
*ds
, uint64_t obj
,
4254 dsl_dataset_zapify(ds
, tx
);
4255 VERIFY0(zap_add(ds
->ds_dir
->dd_pool
->dp_meta_objset
, ds
->ds_object
,
4256 DS_FIELD_REMAP_DEADLIST
, sizeof (obj
), 1, &obj
, tx
));
4260 dsl_dataset_unset_remap_deadlist_object(dsl_dataset_t
*ds
, dmu_tx_t
*tx
)
4262 VERIFY0(zap_remove(ds
->ds_dir
->dd_pool
->dp_meta_objset
,
4263 ds
->ds_object
, DS_FIELD_REMAP_DEADLIST
, tx
));
4267 dsl_dataset_destroy_remap_deadlist(dsl_dataset_t
*ds
, dmu_tx_t
*tx
)
4269 uint64_t remap_deadlist_object
;
4270 spa_t
*spa
= ds
->ds_dir
->dd_pool
->dp_spa
;
4272 ASSERT(dmu_tx_is_syncing(tx
));
4273 ASSERT(dsl_dataset_remap_deadlist_exists(ds
));
4275 remap_deadlist_object
= ds
->ds_remap_deadlist
.dl_object
;
4276 dsl_deadlist_close(&ds
->ds_remap_deadlist
);
4277 dsl_deadlist_free(spa_meta_objset(spa
), remap_deadlist_object
, tx
);
4278 dsl_dataset_unset_remap_deadlist_object(ds
, tx
);
4279 spa_feature_decr(spa
, SPA_FEATURE_OBSOLETE_COUNTS
, tx
);
4283 dsl_dataset_create_remap_deadlist(dsl_dataset_t
*ds
, dmu_tx_t
*tx
)
4285 uint64_t remap_deadlist_obj
;
4286 spa_t
*spa
= ds
->ds_dir
->dd_pool
->dp_spa
;
4288 ASSERT(dmu_tx_is_syncing(tx
));
4289 ASSERT(MUTEX_HELD(&ds
->ds_remap_deadlist_lock
));
4291 * Currently we only create remap deadlists when there are indirect
4292 * vdevs with referenced mappings.
4294 ASSERT(spa_feature_is_active(spa
, SPA_FEATURE_DEVICE_REMOVAL
));
4296 remap_deadlist_obj
= dsl_deadlist_clone(
4297 &ds
->ds_deadlist
, UINT64_MAX
,
4298 dsl_dataset_phys(ds
)->ds_prev_snap_obj
, tx
);
4299 dsl_dataset_set_remap_deadlist_object(ds
,
4300 remap_deadlist_obj
, tx
);
4301 dsl_deadlist_open(&ds
->ds_remap_deadlist
, spa_meta_objset(spa
),
4302 remap_deadlist_obj
);
4303 spa_feature_incr(spa
, SPA_FEATURE_OBSOLETE_COUNTS
, tx
);