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, 2018 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) 2016 Actifio, Inc. All rights reserved.
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/policy.h>
60 #include <sys/dmu_send.h>
61 #include <sys/dmu_recv.h>
62 #include <sys/zio_compress.h>
63 #include <zfs_fletcher.h>
64 #include <sys/zio_checksum.h>
67 * The SPA supports block sizes up to 16MB. However, very large blocks
68 * can have an impact on i/o latency (e.g. tying up a spinning disk for
69 * ~300ms), and also potentially on the memory allocator. Therefore,
70 * we do not allow the recordsize to be set larger than zfs_max_recordsize
71 * (default 1MB). Larger blocks can be created by changing this tunable,
72 * and pools with larger blocks can always be imported and used, regardless
75 int zfs_max_recordsize
= 1 * 1024 * 1024;
76 int zfs_allow_redacted_dataset_mount
= 0;
78 #define SWITCH64(x, y) \
80 uint64_t __tmp = (x); \
85 #define DS_REF_MAX (1ULL << 62)
87 extern inline dsl_dataset_phys_t
*dsl_dataset_phys(dsl_dataset_t
*ds
);
89 static void dsl_dataset_set_remap_deadlist_object(dsl_dataset_t
*ds
,
90 uint64_t obj
, dmu_tx_t
*tx
);
91 static void dsl_dataset_unset_remap_deadlist_object(dsl_dataset_t
*ds
,
94 static void unload_zfeature(dsl_dataset_t
*ds
, spa_feature_t f
);
96 extern int spa_asize_inflation
;
98 static zil_header_t zero_zil
;
101 * Figure out how much of this delta should be propagated to the dsl_dir
102 * layer. If there's a refreservation, that space has already been
103 * partially accounted for in our ancestors.
106 parent_delta(dsl_dataset_t
*ds
, int64_t delta
)
108 dsl_dataset_phys_t
*ds_phys
;
109 uint64_t old_bytes
, new_bytes
;
111 if (ds
->ds_reserved
== 0)
114 ds_phys
= dsl_dataset_phys(ds
);
115 old_bytes
= MAX(ds_phys
->ds_unique_bytes
, ds
->ds_reserved
);
116 new_bytes
= MAX(ds_phys
->ds_unique_bytes
+ delta
, ds
->ds_reserved
);
118 ASSERT3U(ABS((int64_t)(new_bytes
- old_bytes
)), <=, ABS(delta
));
119 return (new_bytes
- old_bytes
);
123 dsl_dataset_block_born(dsl_dataset_t
*ds
, const blkptr_t
*bp
, dmu_tx_t
*tx
)
125 spa_t
*spa
= dmu_tx_pool(tx
)->dp_spa
;
126 int used
= bp_get_dsize_sync(spa
, bp
);
127 int compressed
= BP_GET_PSIZE(bp
);
128 int uncompressed
= BP_GET_UCSIZE(bp
);
131 dprintf_bp(bp
, "ds=%p", ds
);
133 ASSERT(dmu_tx_is_syncing(tx
));
134 /* It could have been compressed away to nothing */
135 if (BP_IS_HOLE(bp
) || BP_IS_REDACTED(bp
))
137 ASSERT(BP_GET_TYPE(bp
) != DMU_OT_NONE
);
138 ASSERT(DMU_OT_IS_VALID(BP_GET_TYPE(bp
)));
140 dsl_pool_mos_diduse_space(tx
->tx_pool
,
141 used
, compressed
, uncompressed
);
145 ASSERT3U(bp
->blk_birth
, >, dsl_dataset_phys(ds
)->ds_prev_snap_txg
);
146 dmu_buf_will_dirty(ds
->ds_dbuf
, tx
);
147 mutex_enter(&ds
->ds_lock
);
148 delta
= parent_delta(ds
, used
);
149 dsl_dataset_phys(ds
)->ds_referenced_bytes
+= used
;
150 dsl_dataset_phys(ds
)->ds_compressed_bytes
+= compressed
;
151 dsl_dataset_phys(ds
)->ds_uncompressed_bytes
+= uncompressed
;
152 dsl_dataset_phys(ds
)->ds_unique_bytes
+= used
;
154 if (BP_GET_LSIZE(bp
) > SPA_OLD_MAXBLOCKSIZE
) {
155 ds
->ds_feature_activation
[SPA_FEATURE_LARGE_BLOCKS
] =
159 spa_feature_t f
= zio_checksum_to_feature(BP_GET_CHECKSUM(bp
));
160 if (f
!= SPA_FEATURE_NONE
) {
161 ASSERT3S(spa_feature_table
[f
].fi_type
, ==,
162 ZFEATURE_TYPE_BOOLEAN
);
163 ds
->ds_feature_activation
[f
] = (void *)B_TRUE
;
167 * Track block for livelist, but ignore embedded blocks because
168 * they do not need to be freed.
170 if (dsl_deadlist_is_open(&ds
->ds_dir
->dd_livelist
) &&
171 bp
->blk_birth
> ds
->ds_dir
->dd_origin_txg
&&
172 !(BP_IS_EMBEDDED(bp
))) {
173 ASSERT(dsl_dir_is_clone(ds
->ds_dir
));
174 ASSERT(spa_feature_is_enabled(spa
,
175 SPA_FEATURE_LIVELIST
));
176 bplist_append(&ds
->ds_dir
->dd_pending_allocs
, bp
);
179 mutex_exit(&ds
->ds_lock
);
180 dsl_dir_diduse_space(ds
->ds_dir
, DD_USED_HEAD
, delta
,
181 compressed
, uncompressed
, tx
);
182 dsl_dir_transfer_space(ds
->ds_dir
, used
- delta
,
183 DD_USED_REFRSRV
, DD_USED_HEAD
, tx
);
187 * Called when the specified segment has been remapped, and is thus no
188 * longer referenced in the head dataset. The vdev must be indirect.
190 * If the segment is referenced by a snapshot, put it on the remap deadlist.
191 * Otherwise, add this segment to the obsolete spacemap.
194 dsl_dataset_block_remapped(dsl_dataset_t
*ds
, uint64_t vdev
, uint64_t offset
,
195 uint64_t size
, uint64_t birth
, dmu_tx_t
*tx
)
197 spa_t
*spa
= ds
->ds_dir
->dd_pool
->dp_spa
;
199 ASSERT(dmu_tx_is_syncing(tx
));
200 ASSERT(birth
<= tx
->tx_txg
);
201 ASSERT(!ds
->ds_is_snapshot
);
203 if (birth
> dsl_dataset_phys(ds
)->ds_prev_snap_txg
) {
204 spa_vdev_indirect_mark_obsolete(spa
, vdev
, offset
, size
, tx
);
207 dva_t
*dva
= &fakebp
.blk_dva
[0];
211 mutex_enter(&ds
->ds_remap_deadlist_lock
);
212 if (!dsl_dataset_remap_deadlist_exists(ds
)) {
213 dsl_dataset_create_remap_deadlist(ds
, tx
);
215 mutex_exit(&ds
->ds_remap_deadlist_lock
);
218 fakebp
.blk_birth
= birth
;
219 DVA_SET_VDEV(dva
, vdev
);
220 DVA_SET_OFFSET(dva
, offset
);
221 DVA_SET_ASIZE(dva
, size
);
222 dsl_deadlist_insert(&ds
->ds_remap_deadlist
, &fakebp
, B_FALSE
,
228 dsl_dataset_block_kill(dsl_dataset_t
*ds
, const blkptr_t
*bp
, dmu_tx_t
*tx
,
231 spa_t
*spa
= dmu_tx_pool(tx
)->dp_spa
;
233 int used
= bp_get_dsize_sync(spa
, bp
);
234 int compressed
= BP_GET_PSIZE(bp
);
235 int uncompressed
= BP_GET_UCSIZE(bp
);
237 if (BP_IS_HOLE(bp
) || BP_IS_REDACTED(bp
))
240 ASSERT(dmu_tx_is_syncing(tx
));
241 ASSERT(bp
->blk_birth
<= tx
->tx_txg
);
244 dsl_free(tx
->tx_pool
, tx
->tx_txg
, bp
);
245 dsl_pool_mos_diduse_space(tx
->tx_pool
,
246 -used
, -compressed
, -uncompressed
);
249 ASSERT3P(tx
->tx_pool
, ==, ds
->ds_dir
->dd_pool
);
251 ASSERT(!ds
->ds_is_snapshot
);
252 dmu_buf_will_dirty(ds
->ds_dbuf
, tx
);
255 * Track block for livelist, but ignore embedded blocks because
256 * they do not need to be freed.
258 if (dsl_deadlist_is_open(&ds
->ds_dir
->dd_livelist
) &&
259 bp
->blk_birth
> ds
->ds_dir
->dd_origin_txg
&&
260 !(BP_IS_EMBEDDED(bp
))) {
261 ASSERT(dsl_dir_is_clone(ds
->ds_dir
));
262 ASSERT(spa_feature_is_enabled(spa
,
263 SPA_FEATURE_LIVELIST
));
264 bplist_append(&ds
->ds_dir
->dd_pending_frees
, bp
);
267 if (bp
->blk_birth
> dsl_dataset_phys(ds
)->ds_prev_snap_txg
) {
270 dprintf_bp(bp
, "freeing ds=%llu", ds
->ds_object
);
271 dsl_free(tx
->tx_pool
, tx
->tx_txg
, bp
);
273 mutex_enter(&ds
->ds_lock
);
274 ASSERT(dsl_dataset_phys(ds
)->ds_unique_bytes
>= used
||
275 !DS_UNIQUE_IS_ACCURATE(ds
));
276 delta
= parent_delta(ds
, -used
);
277 dsl_dataset_phys(ds
)->ds_unique_bytes
-= used
;
278 mutex_exit(&ds
->ds_lock
);
279 dsl_dir_diduse_space(ds
->ds_dir
, DD_USED_HEAD
,
280 delta
, -compressed
, -uncompressed
, tx
);
281 dsl_dir_transfer_space(ds
->ds_dir
, -used
- delta
,
282 DD_USED_REFRSRV
, DD_USED_HEAD
, tx
);
284 dprintf_bp(bp
, "putting on dead list: %s", "");
287 * We are here as part of zio's write done callback,
288 * which means we're a zio interrupt thread. We can't
289 * call dsl_deadlist_insert() now because it may block
290 * waiting for I/O. Instead, put bp on the deferred
291 * queue and let dsl_pool_sync() finish the job.
293 bplist_append(&ds
->ds_pending_deadlist
, bp
);
295 dsl_deadlist_insert(&ds
->ds_deadlist
, bp
, B_FALSE
, tx
);
297 ASSERT3U(ds
->ds_prev
->ds_object
, ==,
298 dsl_dataset_phys(ds
)->ds_prev_snap_obj
);
299 ASSERT(dsl_dataset_phys(ds
->ds_prev
)->ds_num_children
> 0);
300 /* if (bp->blk_birth > prev prev snap txg) prev unique += bs */
301 if (dsl_dataset_phys(ds
->ds_prev
)->ds_next_snap_obj
==
302 ds
->ds_object
&& bp
->blk_birth
>
303 dsl_dataset_phys(ds
->ds_prev
)->ds_prev_snap_txg
) {
304 dmu_buf_will_dirty(ds
->ds_prev
->ds_dbuf
, tx
);
305 mutex_enter(&ds
->ds_prev
->ds_lock
);
306 dsl_dataset_phys(ds
->ds_prev
)->ds_unique_bytes
+= used
;
307 mutex_exit(&ds
->ds_prev
->ds_lock
);
309 if (bp
->blk_birth
> ds
->ds_dir
->dd_origin_txg
) {
310 dsl_dir_transfer_space(ds
->ds_dir
, used
,
311 DD_USED_HEAD
, DD_USED_SNAP
, tx
);
315 dsl_bookmark_block_killed(ds
, bp
, tx
);
317 mutex_enter(&ds
->ds_lock
);
318 ASSERT3U(dsl_dataset_phys(ds
)->ds_referenced_bytes
, >=, used
);
319 dsl_dataset_phys(ds
)->ds_referenced_bytes
-= used
;
320 ASSERT3U(dsl_dataset_phys(ds
)->ds_compressed_bytes
, >=, compressed
);
321 dsl_dataset_phys(ds
)->ds_compressed_bytes
-= compressed
;
322 ASSERT3U(dsl_dataset_phys(ds
)->ds_uncompressed_bytes
, >=, uncompressed
);
323 dsl_dataset_phys(ds
)->ds_uncompressed_bytes
-= uncompressed
;
324 mutex_exit(&ds
->ds_lock
);
329 struct feature_type_uint64_array_arg
{
335 unload_zfeature(dsl_dataset_t
*ds
, spa_feature_t f
)
337 switch (spa_feature_table
[f
].fi_type
) {
338 case ZFEATURE_TYPE_BOOLEAN
:
340 case ZFEATURE_TYPE_UINT64_ARRAY
:
342 struct feature_type_uint64_array_arg
*ftuaa
= ds
->ds_feature
[f
];
343 kmem_free(ftuaa
->array
, ftuaa
->length
* sizeof (uint64_t));
344 kmem_free(ftuaa
, sizeof (*ftuaa
));
348 panic("Invalid zfeature type %d", spa_feature_table
[f
].fi_type
);
353 load_zfeature(objset_t
*mos
, dsl_dataset_t
*ds
, spa_feature_t f
)
356 switch (spa_feature_table
[f
].fi_type
) {
357 case ZFEATURE_TYPE_BOOLEAN
:
358 err
= zap_contains(mos
, ds
->ds_object
,
359 spa_feature_table
[f
].fi_guid
);
361 ds
->ds_feature
[f
] = (void *)B_TRUE
;
363 ASSERT3U(err
, ==, ENOENT
);
367 case ZFEATURE_TYPE_UINT64_ARRAY
:
369 uint64_t int_size
, num_int
;
371 err
= zap_length(mos
, ds
->ds_object
,
372 spa_feature_table
[f
].fi_guid
, &int_size
, &num_int
);
374 ASSERT3U(err
, ==, ENOENT
);
378 ASSERT3U(int_size
, ==, sizeof (uint64_t));
379 data
= kmem_alloc(int_size
* num_int
, KM_SLEEP
);
380 VERIFY0(zap_lookup(mos
, ds
->ds_object
,
381 spa_feature_table
[f
].fi_guid
, int_size
, num_int
, data
));
382 struct feature_type_uint64_array_arg
*ftuaa
=
383 kmem_alloc(sizeof (*ftuaa
), KM_SLEEP
);
384 ftuaa
->length
= num_int
;
386 ds
->ds_feature
[f
] = ftuaa
;
390 panic("Invalid zfeature type %d", spa_feature_table
[f
].fi_type
);
396 * We have to release the fsid syncronously or we risk that a subsequent
397 * mount of the same dataset will fail to unique_insert the fsid. This
398 * failure would manifest itself as the fsid of this dataset changing
399 * between mounts which makes NFS clients quite unhappy.
402 dsl_dataset_evict_sync(void *dbu
)
404 dsl_dataset_t
*ds
= dbu
;
406 ASSERT(ds
->ds_owner
== NULL
);
408 unique_remove(ds
->ds_fsid_guid
);
412 dsl_dataset_evict_async(void *dbu
)
414 dsl_dataset_t
*ds
= dbu
;
416 ASSERT(ds
->ds_owner
== NULL
);
420 if (ds
->ds_objset
!= NULL
)
421 dmu_objset_evict(ds
->ds_objset
);
424 dsl_dataset_rele(ds
->ds_prev
, ds
);
428 dsl_bookmark_fini_ds(ds
);
430 bplist_destroy(&ds
->ds_pending_deadlist
);
431 if (dsl_deadlist_is_open(&ds
->ds_deadlist
))
432 dsl_deadlist_close(&ds
->ds_deadlist
);
433 if (dsl_deadlist_is_open(&ds
->ds_remap_deadlist
))
434 dsl_deadlist_close(&ds
->ds_remap_deadlist
);
436 dsl_dir_async_rele(ds
->ds_dir
, ds
);
438 ASSERT(!list_link_active(&ds
->ds_synced_link
));
440 for (spa_feature_t f
= 0; f
< SPA_FEATURES
; f
++) {
441 if (dsl_dataset_feature_is_active(ds
, f
))
442 unload_zfeature(ds
, f
);
445 list_destroy(&ds
->ds_prop_cbs
);
446 mutex_destroy(&ds
->ds_lock
);
447 mutex_destroy(&ds
->ds_opening_lock
);
448 mutex_destroy(&ds
->ds_sendstream_lock
);
449 mutex_destroy(&ds
->ds_remap_deadlist_lock
);
450 zfs_refcount_destroy(&ds
->ds_longholds
);
451 rrw_destroy(&ds
->ds_bp_rwlock
);
453 kmem_free(ds
, sizeof (dsl_dataset_t
));
457 dsl_dataset_get_snapname(dsl_dataset_t
*ds
)
459 dsl_dataset_phys_t
*headphys
;
462 dsl_pool_t
*dp
= ds
->ds_dir
->dd_pool
;
463 objset_t
*mos
= dp
->dp_meta_objset
;
465 if (ds
->ds_snapname
[0])
467 if (dsl_dataset_phys(ds
)->ds_next_snap_obj
== 0)
470 err
= dmu_bonus_hold(mos
, dsl_dir_phys(ds
->ds_dir
)->dd_head_dataset_obj
,
474 headphys
= headdbuf
->db_data
;
475 err
= zap_value_search(dp
->dp_meta_objset
,
476 headphys
->ds_snapnames_zapobj
, ds
->ds_object
, 0, ds
->ds_snapname
);
477 if (err
!= 0 && zfs_recover
== B_TRUE
) {
479 (void) snprintf(ds
->ds_snapname
, sizeof (ds
->ds_snapname
),
480 "SNAPOBJ=%llu-ERR=%d",
481 (unsigned long long)ds
->ds_object
, err
);
483 dmu_buf_rele(headdbuf
, FTAG
);
488 dsl_dataset_snap_lookup(dsl_dataset_t
*ds
, const char *name
, uint64_t *value
)
490 objset_t
*mos
= ds
->ds_dir
->dd_pool
->dp_meta_objset
;
491 uint64_t snapobj
= dsl_dataset_phys(ds
)->ds_snapnames_zapobj
;
495 if (dsl_dataset_phys(ds
)->ds_flags
& DS_FLAG_CI_DATASET
)
498 err
= zap_lookup_norm(mos
, snapobj
, name
, 8, 1,
499 value
, mt
, NULL
, 0, NULL
);
500 if (err
== ENOTSUP
&& (mt
& MT_NORMALIZE
))
501 err
= zap_lookup(mos
, snapobj
, name
, 8, 1, value
);
506 dsl_dataset_snap_remove(dsl_dataset_t
*ds
, const char *name
, dmu_tx_t
*tx
,
509 objset_t
*mos
= ds
->ds_dir
->dd_pool
->dp_meta_objset
;
510 uint64_t snapobj
= dsl_dataset_phys(ds
)->ds_snapnames_zapobj
;
514 dsl_dir_snap_cmtime_update(ds
->ds_dir
);
516 if (dsl_dataset_phys(ds
)->ds_flags
& DS_FLAG_CI_DATASET
)
519 err
= zap_remove_norm(mos
, snapobj
, name
, mt
, tx
);
520 if (err
== ENOTSUP
&& (mt
& MT_NORMALIZE
))
521 err
= zap_remove(mos
, snapobj
, name
, tx
);
523 if (err
== 0 && adj_cnt
)
524 dsl_fs_ss_count_adjust(ds
->ds_dir
, -1,
525 DD_FIELD_SNAPSHOT_COUNT
, tx
);
531 dsl_dataset_try_add_ref(dsl_pool_t
*dp
, dsl_dataset_t
*ds
, void *tag
)
533 dmu_buf_t
*dbuf
= ds
->ds_dbuf
;
534 boolean_t result
= B_FALSE
;
536 if (dbuf
!= NULL
&& dmu_buf_try_add_ref(dbuf
, dp
->dp_meta_objset
,
537 ds
->ds_object
, DMU_BONUS_BLKID
, tag
)) {
539 if (ds
== dmu_buf_get_user(dbuf
))
542 dmu_buf_rele(dbuf
, tag
);
549 dsl_dataset_hold_obj(dsl_pool_t
*dp
, uint64_t dsobj
, void *tag
,
552 objset_t
*mos
= dp
->dp_meta_objset
;
556 dmu_object_info_t doi
;
558 ASSERT(dsl_pool_config_held(dp
));
560 err
= dmu_bonus_hold(mos
, dsobj
, tag
, &dbuf
);
564 /* Make sure dsobj has the correct object type. */
565 dmu_object_info_from_db(dbuf
, &doi
);
566 if (doi
.doi_bonus_type
!= DMU_OT_DSL_DATASET
) {
567 dmu_buf_rele(dbuf
, tag
);
568 return (SET_ERROR(EINVAL
));
571 ds
= dmu_buf_get_user(dbuf
);
573 dsl_dataset_t
*winner
= NULL
;
575 ds
= kmem_zalloc(sizeof (dsl_dataset_t
), KM_SLEEP
);
577 ds
->ds_object
= dsobj
;
578 ds
->ds_is_snapshot
= dsl_dataset_phys(ds
)->ds_num_children
!= 0;
579 list_link_init(&ds
->ds_synced_link
);
581 err
= dsl_dir_hold_obj(dp
, dsl_dataset_phys(ds
)->ds_dir_obj
,
582 NULL
, ds
, &ds
->ds_dir
);
584 kmem_free(ds
, sizeof (dsl_dataset_t
));
585 dmu_buf_rele(dbuf
, tag
);
589 mutex_init(&ds
->ds_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
590 mutex_init(&ds
->ds_opening_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
591 mutex_init(&ds
->ds_sendstream_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
592 mutex_init(&ds
->ds_remap_deadlist_lock
,
593 NULL
, MUTEX_DEFAULT
, NULL
);
594 rrw_init(&ds
->ds_bp_rwlock
, B_FALSE
);
595 zfs_refcount_create(&ds
->ds_longholds
);
597 bplist_create(&ds
->ds_pending_deadlist
);
599 list_create(&ds
->ds_sendstreams
, sizeof (dmu_sendstatus_t
),
600 offsetof(dmu_sendstatus_t
, dss_link
));
602 list_create(&ds
->ds_prop_cbs
, sizeof (dsl_prop_cb_record_t
),
603 offsetof(dsl_prop_cb_record_t
, cbr_ds_node
));
605 if (doi
.doi_type
== DMU_OTN_ZAP_METADATA
) {
608 for (f
= 0; f
< SPA_FEATURES
; f
++) {
609 if (!(spa_feature_table
[f
].fi_flags
&
610 ZFEATURE_FLAG_PER_DATASET
))
612 err
= load_zfeature(mos
, ds
, f
);
616 if (!ds
->ds_is_snapshot
) {
617 ds
->ds_snapname
[0] = '\0';
618 if (dsl_dataset_phys(ds
)->ds_prev_snap_obj
!= 0) {
619 err
= dsl_dataset_hold_obj(dp
,
620 dsl_dataset_phys(ds
)->ds_prev_snap_obj
,
623 err
= dsl_bookmark_init_ds(ds
);
625 if (zfs_flags
& ZFS_DEBUG_SNAPNAMES
)
626 err
= dsl_dataset_get_snapname(ds
);
628 dsl_dataset_phys(ds
)->ds_userrefs_obj
!= 0) {
630 ds
->ds_dir
->dd_pool
->dp_meta_objset
,
631 dsl_dataset_phys(ds
)->ds_userrefs_obj
,
636 if (err
== 0 && !ds
->ds_is_snapshot
) {
637 err
= dsl_prop_get_int_ds(ds
,
638 zfs_prop_to_name(ZFS_PROP_REFRESERVATION
),
641 err
= dsl_prop_get_int_ds(ds
,
642 zfs_prop_to_name(ZFS_PROP_REFQUOTA
),
646 ds
->ds_reserved
= ds
->ds_quota
= 0;
649 if (err
== 0 && ds
->ds_dir
->dd_crypto_obj
!= 0 &&
650 ds
->ds_is_snapshot
&&
651 zap_contains(mos
, dsobj
, DS_FIELD_IVSET_GUID
) != 0) {
652 dp
->dp_spa
->spa_errata
=
653 ZPOOL_ERRATA_ZOL_8308_ENCRYPTION
;
656 dsl_deadlist_open(&ds
->ds_deadlist
,
657 mos
, dsl_dataset_phys(ds
)->ds_deadlist_obj
);
658 uint64_t remap_deadlist_obj
=
659 dsl_dataset_get_remap_deadlist_object(ds
);
660 if (remap_deadlist_obj
!= 0) {
661 dsl_deadlist_open(&ds
->ds_remap_deadlist
, mos
,
665 dmu_buf_init_user(&ds
->ds_dbu
, dsl_dataset_evict_sync
,
666 dsl_dataset_evict_async
, &ds
->ds_dbuf
);
668 winner
= dmu_buf_set_user_ie(dbuf
, &ds
->ds_dbu
);
670 if (err
!= 0 || winner
!= NULL
) {
671 bplist_destroy(&ds
->ds_pending_deadlist
);
672 dsl_deadlist_close(&ds
->ds_deadlist
);
673 if (dsl_deadlist_is_open(&ds
->ds_remap_deadlist
))
674 dsl_deadlist_close(&ds
->ds_remap_deadlist
);
675 dsl_bookmark_fini_ds(ds
);
677 dsl_dataset_rele(ds
->ds_prev
, ds
);
678 dsl_dir_rele(ds
->ds_dir
, ds
);
679 for (spa_feature_t f
= 0; f
< SPA_FEATURES
; f
++) {
680 if (dsl_dataset_feature_is_active(ds
, f
))
681 unload_zfeature(ds
, f
);
684 list_destroy(&ds
->ds_prop_cbs
);
685 list_destroy(&ds
->ds_sendstreams
);
686 mutex_destroy(&ds
->ds_lock
);
687 mutex_destroy(&ds
->ds_opening_lock
);
688 mutex_destroy(&ds
->ds_sendstream_lock
);
689 mutex_destroy(&ds
->ds_remap_deadlist_lock
);
690 zfs_refcount_destroy(&ds
->ds_longholds
);
691 rrw_destroy(&ds
->ds_bp_rwlock
);
692 kmem_free(ds
, sizeof (dsl_dataset_t
));
694 dmu_buf_rele(dbuf
, tag
);
700 unique_insert(dsl_dataset_phys(ds
)->ds_fsid_guid
);
701 if (ds
->ds_fsid_guid
!=
702 dsl_dataset_phys(ds
)->ds_fsid_guid
) {
703 zfs_dbgmsg("ds_fsid_guid changed from "
704 "%llx to %llx for pool %s dataset id %llu",
706 dsl_dataset_phys(ds
)->ds_fsid_guid
,
707 (long long)ds
->ds_fsid_guid
,
708 spa_name(dp
->dp_spa
),
714 ASSERT3P(ds
->ds_dbuf
, ==, dbuf
);
715 ASSERT3P(dsl_dataset_phys(ds
), ==, dbuf
->db_data
);
716 ASSERT(dsl_dataset_phys(ds
)->ds_prev_snap_obj
!= 0 ||
717 spa_version(dp
->dp_spa
) < SPA_VERSION_ORIGIN
||
718 dp
->dp_origin_snap
== NULL
|| ds
== dp
->dp_origin_snap
);
725 dsl_dataset_create_key_mapping(dsl_dataset_t
*ds
)
727 dsl_dir_t
*dd
= ds
->ds_dir
;
729 if (dd
->dd_crypto_obj
== 0)
732 return (spa_keystore_create_mapping(dd
->dd_pool
->dp_spa
,
733 ds
, ds
, &ds
->ds_key_mapping
));
737 dsl_dataset_hold_obj_flags(dsl_pool_t
*dp
, uint64_t dsobj
,
738 ds_hold_flags_t flags
, void *tag
, dsl_dataset_t
**dsp
)
742 err
= dsl_dataset_hold_obj(dp
, dsobj
, tag
, dsp
);
746 ASSERT3P(*dsp
, !=, NULL
);
748 if (flags
& DS_HOLD_FLAG_DECRYPT
) {
749 err
= dsl_dataset_create_key_mapping(*dsp
);
751 dsl_dataset_rele(*dsp
, tag
);
758 dsl_dataset_hold_flags(dsl_pool_t
*dp
, const char *name
, ds_hold_flags_t flags
,
759 void *tag
, dsl_dataset_t
**dsp
)
762 const char *snapname
;
767 err
= dsl_dir_hold(dp
, name
, FTAG
, &dd
, &snapname
);
771 ASSERT(dsl_pool_config_held(dp
));
772 obj
= dsl_dir_phys(dd
)->dd_head_dataset_obj
;
774 err
= dsl_dataset_hold_obj_flags(dp
, obj
, flags
, tag
, &ds
);
776 err
= SET_ERROR(ENOENT
);
778 /* we may be looking for a snapshot */
779 if (err
== 0 && snapname
!= NULL
) {
780 dsl_dataset_t
*snap_ds
;
782 if (*snapname
++ != '@') {
783 dsl_dataset_rele_flags(ds
, flags
, tag
);
784 dsl_dir_rele(dd
, FTAG
);
785 return (SET_ERROR(ENOENT
));
788 dprintf("looking for snapshot '%s'\n", snapname
);
789 err
= dsl_dataset_snap_lookup(ds
, snapname
, &obj
);
791 err
= dsl_dataset_hold_obj_flags(dp
, obj
, flags
, tag
,
794 dsl_dataset_rele_flags(ds
, flags
, tag
);
797 mutex_enter(&snap_ds
->ds_lock
);
798 if (snap_ds
->ds_snapname
[0] == 0)
799 (void) strlcpy(snap_ds
->ds_snapname
, snapname
,
800 sizeof (snap_ds
->ds_snapname
));
801 mutex_exit(&snap_ds
->ds_lock
);
807 dsl_dir_rele(dd
, FTAG
);
812 dsl_dataset_hold(dsl_pool_t
*dp
, const char *name
, void *tag
,
815 return (dsl_dataset_hold_flags(dp
, name
, 0, tag
, dsp
));
819 dsl_dataset_own_obj_impl(dsl_pool_t
*dp
, uint64_t dsobj
, ds_hold_flags_t flags
,
820 void *tag
, boolean_t override
, dsl_dataset_t
**dsp
)
822 int err
= dsl_dataset_hold_obj_flags(dp
, dsobj
, flags
, tag
, dsp
);
825 if (!dsl_dataset_tryown(*dsp
, tag
, override
)) {
826 dsl_dataset_rele_flags(*dsp
, flags
, tag
);
828 return (SET_ERROR(EBUSY
));
835 dsl_dataset_own_obj(dsl_pool_t
*dp
, uint64_t dsobj
, ds_hold_flags_t flags
,
836 void *tag
, dsl_dataset_t
**dsp
)
838 return (dsl_dataset_own_obj_impl(dp
, dsobj
, flags
, tag
, B_FALSE
, dsp
));
842 dsl_dataset_own_obj_force(dsl_pool_t
*dp
, uint64_t dsobj
,
843 ds_hold_flags_t flags
, void *tag
, dsl_dataset_t
**dsp
)
845 return (dsl_dataset_own_obj_impl(dp
, dsobj
, flags
, tag
, B_TRUE
, dsp
));
849 dsl_dataset_own_impl(dsl_pool_t
*dp
, const char *name
, ds_hold_flags_t flags
,
850 void *tag
, boolean_t override
, dsl_dataset_t
**dsp
)
852 int err
= dsl_dataset_hold_flags(dp
, name
, flags
, tag
, dsp
);
855 if (!dsl_dataset_tryown(*dsp
, tag
, override
)) {
856 dsl_dataset_rele_flags(*dsp
, flags
, tag
);
857 return (SET_ERROR(EBUSY
));
863 dsl_dataset_own_force(dsl_pool_t
*dp
, const char *name
, ds_hold_flags_t flags
,
864 void *tag
, dsl_dataset_t
**dsp
)
866 return (dsl_dataset_own_impl(dp
, name
, flags
, tag
, B_TRUE
, dsp
));
870 dsl_dataset_own(dsl_pool_t
*dp
, const char *name
, ds_hold_flags_t flags
,
871 void *tag
, dsl_dataset_t
**dsp
)
873 return (dsl_dataset_own_impl(dp
, name
, flags
, tag
, B_FALSE
, dsp
));
877 * See the comment above dsl_pool_hold() for details. In summary, a long
878 * hold is used to prevent destruction of a dataset while the pool hold
879 * is dropped, allowing other concurrent operations (e.g. spa_sync()).
881 * The dataset and pool must be held when this function is called. After it
882 * is called, the pool hold may be released while the dataset is still held
886 dsl_dataset_long_hold(dsl_dataset_t
*ds
, void *tag
)
888 ASSERT(dsl_pool_config_held(ds
->ds_dir
->dd_pool
));
889 (void) zfs_refcount_add(&ds
->ds_longholds
, tag
);
893 dsl_dataset_long_rele(dsl_dataset_t
*ds
, void *tag
)
895 (void) zfs_refcount_remove(&ds
->ds_longholds
, tag
);
898 /* Return B_TRUE if there are any long holds on this dataset. */
900 dsl_dataset_long_held(dsl_dataset_t
*ds
)
902 return (!zfs_refcount_is_zero(&ds
->ds_longholds
));
906 dsl_dataset_name(dsl_dataset_t
*ds
, char *name
)
909 (void) strcpy(name
, "mos");
911 dsl_dir_name(ds
->ds_dir
, name
);
912 VERIFY0(dsl_dataset_get_snapname(ds
));
913 if (ds
->ds_snapname
[0]) {
914 VERIFY3U(strlcat(name
, "@", ZFS_MAX_DATASET_NAME_LEN
),
915 <, ZFS_MAX_DATASET_NAME_LEN
);
917 * We use a "recursive" mutex so that we
918 * can call dprintf_ds() with ds_lock held.
920 if (!MUTEX_HELD(&ds
->ds_lock
)) {
921 mutex_enter(&ds
->ds_lock
);
922 VERIFY3U(strlcat(name
, ds
->ds_snapname
,
923 ZFS_MAX_DATASET_NAME_LEN
), <,
924 ZFS_MAX_DATASET_NAME_LEN
);
925 mutex_exit(&ds
->ds_lock
);
927 VERIFY3U(strlcat(name
, ds
->ds_snapname
,
928 ZFS_MAX_DATASET_NAME_LEN
), <,
929 ZFS_MAX_DATASET_NAME_LEN
);
936 dsl_dataset_namelen(dsl_dataset_t
*ds
)
938 VERIFY0(dsl_dataset_get_snapname(ds
));
939 mutex_enter(&ds
->ds_lock
);
940 int len
= strlen(ds
->ds_snapname
);
941 mutex_exit(&ds
->ds_lock
);
942 /* add '@' if ds is a snap */
945 len
+= dsl_dir_namelen(ds
->ds_dir
);
950 dsl_dataset_rele(dsl_dataset_t
*ds
, void *tag
)
952 dmu_buf_rele(ds
->ds_dbuf
, tag
);
956 dsl_dataset_remove_key_mapping(dsl_dataset_t
*ds
)
958 dsl_dir_t
*dd
= ds
->ds_dir
;
960 if (dd
== NULL
|| dd
->dd_crypto_obj
== 0)
963 (void) spa_keystore_remove_mapping(dd
->dd_pool
->dp_spa
,
968 dsl_dataset_rele_flags(dsl_dataset_t
*ds
, ds_hold_flags_t flags
, void *tag
)
970 if (flags
& DS_HOLD_FLAG_DECRYPT
)
971 dsl_dataset_remove_key_mapping(ds
);
973 dsl_dataset_rele(ds
, tag
);
977 dsl_dataset_disown(dsl_dataset_t
*ds
, ds_hold_flags_t flags
, void *tag
)
979 ASSERT3P(ds
->ds_owner
, ==, tag
);
980 ASSERT(ds
->ds_dbuf
!= NULL
);
982 mutex_enter(&ds
->ds_lock
);
984 mutex_exit(&ds
->ds_lock
);
985 dsl_dataset_long_rele(ds
, tag
);
986 dsl_dataset_rele_flags(ds
, flags
, tag
);
990 dsl_dataset_tryown(dsl_dataset_t
*ds
, void *tag
, boolean_t override
)
992 boolean_t gotit
= FALSE
;
994 ASSERT(dsl_pool_config_held(ds
->ds_dir
->dd_pool
));
995 mutex_enter(&ds
->ds_lock
);
996 if (ds
->ds_owner
== NULL
&& (override
|| !(DS_IS_INCONSISTENT(ds
) ||
997 (dsl_dataset_feature_is_active(ds
,
998 SPA_FEATURE_REDACTED_DATASETS
) &&
999 !zfs_allow_redacted_dataset_mount
)))) {
1001 dsl_dataset_long_hold(ds
, tag
);
1004 mutex_exit(&ds
->ds_lock
);
1009 dsl_dataset_has_owner(dsl_dataset_t
*ds
)
1012 mutex_enter(&ds
->ds_lock
);
1013 rv
= (ds
->ds_owner
!= NULL
);
1014 mutex_exit(&ds
->ds_lock
);
1019 zfeature_active(spa_feature_t f
, void *arg
)
1021 switch (spa_feature_table
[f
].fi_type
) {
1022 case ZFEATURE_TYPE_BOOLEAN
: {
1023 boolean_t val
= (boolean_t
)arg
;
1024 ASSERT(val
== B_FALSE
|| val
== B_TRUE
);
1027 case ZFEATURE_TYPE_UINT64_ARRAY
:
1029 * In this case, arg is a uint64_t array. The feature is active
1030 * if the array is non-null.
1032 return (arg
!= NULL
);
1034 panic("Invalid zfeature type %d", spa_feature_table
[f
].fi_type
);
1040 dsl_dataset_feature_is_active(dsl_dataset_t
*ds
, spa_feature_t f
)
1042 return (zfeature_active(f
, ds
->ds_feature
[f
]));
1046 * The buffers passed out by this function are references to internal buffers;
1047 * they should not be freed by callers of this function, and they should not be
1048 * used after the dataset has been released.
1051 dsl_dataset_get_uint64_array_feature(dsl_dataset_t
*ds
, spa_feature_t f
,
1052 uint64_t *outlength
, uint64_t **outp
)
1054 VERIFY(spa_feature_table
[f
].fi_type
& ZFEATURE_TYPE_UINT64_ARRAY
);
1055 if (!dsl_dataset_feature_is_active(ds
, f
)) {
1058 struct feature_type_uint64_array_arg
*ftuaa
= ds
->ds_feature
[f
];
1059 *outp
= ftuaa
->array
;
1060 *outlength
= ftuaa
->length
;
1065 dsl_dataset_activate_feature(uint64_t dsobj
, spa_feature_t f
, void *arg
,
1068 spa_t
*spa
= dmu_tx_pool(tx
)->dp_spa
;
1069 objset_t
*mos
= dmu_tx_pool(tx
)->dp_meta_objset
;
1072 VERIFY(spa_feature_table
[f
].fi_flags
& ZFEATURE_FLAG_PER_DATASET
);
1074 spa_feature_incr(spa
, f
, tx
);
1075 dmu_object_zapify(mos
, dsobj
, DMU_OT_DSL_DATASET
, tx
);
1077 switch (spa_feature_table
[f
].fi_type
) {
1078 case ZFEATURE_TYPE_BOOLEAN
:
1079 ASSERT3S((boolean_t
)arg
, ==, B_TRUE
);
1080 VERIFY0(zap_add(mos
, dsobj
, spa_feature_table
[f
].fi_guid
,
1081 sizeof (zero
), 1, &zero
, tx
));
1083 case ZFEATURE_TYPE_UINT64_ARRAY
:
1085 struct feature_type_uint64_array_arg
*ftuaa
= arg
;
1086 VERIFY0(zap_add(mos
, dsobj
, spa_feature_table
[f
].fi_guid
,
1087 sizeof (uint64_t), ftuaa
->length
, ftuaa
->array
, tx
));
1091 panic("Invalid zfeature type %d", spa_feature_table
[f
].fi_type
);
1096 dsl_dataset_deactivate_feature_impl(dsl_dataset_t
*ds
, spa_feature_t f
,
1099 spa_t
*spa
= dmu_tx_pool(tx
)->dp_spa
;
1100 objset_t
*mos
= dmu_tx_pool(tx
)->dp_meta_objset
;
1101 uint64_t dsobj
= ds
->ds_object
;
1103 VERIFY(spa_feature_table
[f
].fi_flags
& ZFEATURE_FLAG_PER_DATASET
);
1105 VERIFY0(zap_remove(mos
, dsobj
, spa_feature_table
[f
].fi_guid
, tx
));
1106 spa_feature_decr(spa
, f
, tx
);
1107 ds
->ds_feature
[f
] = NULL
;
1111 dsl_dataset_deactivate_feature(dsl_dataset_t
*ds
, spa_feature_t f
, dmu_tx_t
*tx
)
1113 unload_zfeature(ds
, f
);
1114 dsl_dataset_deactivate_feature_impl(ds
, f
, tx
);
1118 dsl_dataset_create_sync_dd(dsl_dir_t
*dd
, dsl_dataset_t
*origin
,
1119 dsl_crypto_params_t
*dcp
, uint64_t flags
, dmu_tx_t
*tx
)
1121 dsl_pool_t
*dp
= dd
->dd_pool
;
1123 dsl_dataset_phys_t
*dsphys
;
1125 objset_t
*mos
= dp
->dp_meta_objset
;
1128 origin
= dp
->dp_origin_snap
;
1130 ASSERT(origin
== NULL
|| origin
->ds_dir
->dd_pool
== dp
);
1131 ASSERT(origin
== NULL
|| dsl_dataset_phys(origin
)->ds_num_children
> 0);
1132 ASSERT(dmu_tx_is_syncing(tx
));
1133 ASSERT(dsl_dir_phys(dd
)->dd_head_dataset_obj
== 0);
1135 dsobj
= dmu_object_alloc(mos
, DMU_OT_DSL_DATASET
, 0,
1136 DMU_OT_DSL_DATASET
, sizeof (dsl_dataset_phys_t
), tx
);
1137 VERIFY0(dmu_bonus_hold(mos
, dsobj
, FTAG
, &dbuf
));
1138 dmu_buf_will_dirty(dbuf
, tx
);
1139 dsphys
= dbuf
->db_data
;
1140 bzero(dsphys
, sizeof (dsl_dataset_phys_t
));
1141 dsphys
->ds_dir_obj
= dd
->dd_object
;
1142 dsphys
->ds_flags
= flags
;
1143 dsphys
->ds_fsid_guid
= unique_create();
1144 (void) random_get_pseudo_bytes((void*)&dsphys
->ds_guid
,
1145 sizeof (dsphys
->ds_guid
));
1146 dsphys
->ds_snapnames_zapobj
=
1147 zap_create_norm(mos
, U8_TEXTPREP_TOUPPER
, DMU_OT_DSL_DS_SNAP_MAP
,
1148 DMU_OT_NONE
, 0, tx
);
1149 dsphys
->ds_creation_time
= gethrestime_sec();
1150 dsphys
->ds_creation_txg
= tx
->tx_txg
== TXG_INITIAL
? 1 : tx
->tx_txg
;
1152 if (origin
== NULL
) {
1153 dsphys
->ds_deadlist_obj
= dsl_deadlist_alloc(mos
, tx
);
1155 dsl_dataset_t
*ohds
; /* head of the origin snapshot */
1157 dsphys
->ds_prev_snap_obj
= origin
->ds_object
;
1158 dsphys
->ds_prev_snap_txg
=
1159 dsl_dataset_phys(origin
)->ds_creation_txg
;
1160 dsphys
->ds_referenced_bytes
=
1161 dsl_dataset_phys(origin
)->ds_referenced_bytes
;
1162 dsphys
->ds_compressed_bytes
=
1163 dsl_dataset_phys(origin
)->ds_compressed_bytes
;
1164 dsphys
->ds_uncompressed_bytes
=
1165 dsl_dataset_phys(origin
)->ds_uncompressed_bytes
;
1166 rrw_enter(&origin
->ds_bp_rwlock
, RW_READER
, FTAG
);
1167 dsphys
->ds_bp
= dsl_dataset_phys(origin
)->ds_bp
;
1168 rrw_exit(&origin
->ds_bp_rwlock
, FTAG
);
1171 * Inherit flags that describe the dataset's contents
1172 * (INCONSISTENT) or properties (Case Insensitive).
1174 dsphys
->ds_flags
|= dsl_dataset_phys(origin
)->ds_flags
&
1175 (DS_FLAG_INCONSISTENT
| DS_FLAG_CI_DATASET
);
1177 for (spa_feature_t f
= 0; f
< SPA_FEATURES
; f
++) {
1178 if (zfeature_active(f
, origin
->ds_feature
[f
])) {
1179 dsl_dataset_activate_feature(dsobj
, f
,
1180 origin
->ds_feature
[f
], tx
);
1184 dmu_buf_will_dirty(origin
->ds_dbuf
, tx
);
1185 dsl_dataset_phys(origin
)->ds_num_children
++;
1187 VERIFY0(dsl_dataset_hold_obj(dp
,
1188 dsl_dir_phys(origin
->ds_dir
)->dd_head_dataset_obj
,
1190 dsphys
->ds_deadlist_obj
= dsl_deadlist_clone(&ohds
->ds_deadlist
,
1191 dsphys
->ds_prev_snap_txg
, dsphys
->ds_prev_snap_obj
, tx
);
1192 dsl_dataset_rele(ohds
, FTAG
);
1194 if (spa_version(dp
->dp_spa
) >= SPA_VERSION_NEXT_CLONES
) {
1195 if (dsl_dataset_phys(origin
)->ds_next_clones_obj
== 0) {
1196 dsl_dataset_phys(origin
)->ds_next_clones_obj
=
1198 DMU_OT_NEXT_CLONES
, DMU_OT_NONE
, 0, tx
);
1200 VERIFY0(zap_add_int(mos
,
1201 dsl_dataset_phys(origin
)->ds_next_clones_obj
,
1205 dmu_buf_will_dirty(dd
->dd_dbuf
, tx
);
1206 dsl_dir_phys(dd
)->dd_origin_obj
= origin
->ds_object
;
1207 if (spa_version(dp
->dp_spa
) >= SPA_VERSION_DIR_CLONES
) {
1208 if (dsl_dir_phys(origin
->ds_dir
)->dd_clones
== 0) {
1209 dmu_buf_will_dirty(origin
->ds_dir
->dd_dbuf
, tx
);
1210 dsl_dir_phys(origin
->ds_dir
)->dd_clones
=
1212 DMU_OT_DSL_CLONES
, DMU_OT_NONE
, 0, tx
);
1214 VERIFY0(zap_add_int(mos
,
1215 dsl_dir_phys(origin
->ds_dir
)->dd_clones
,
1220 /* handle encryption */
1221 dsl_dataset_create_crypt_sync(dsobj
, dd
, origin
, dcp
, tx
);
1223 if (spa_version(dp
->dp_spa
) >= SPA_VERSION_UNIQUE_ACCURATE
)
1224 dsphys
->ds_flags
|= DS_FLAG_UNIQUE_ACCURATE
;
1226 dmu_buf_rele(dbuf
, FTAG
);
1228 dmu_buf_will_dirty(dd
->dd_dbuf
, tx
);
1229 dsl_dir_phys(dd
)->dd_head_dataset_obj
= dsobj
;
1235 dsl_dataset_zero_zil(dsl_dataset_t
*ds
, dmu_tx_t
*tx
)
1239 VERIFY0(dmu_objset_from_ds(ds
, &os
));
1240 if (bcmp(&os
->os_zil_header
, &zero_zil
, sizeof (zero_zil
)) != 0) {
1241 dsl_pool_t
*dp
= ds
->ds_dir
->dd_pool
;
1244 bzero(&os
->os_zil_header
, sizeof (os
->os_zil_header
));
1245 if (os
->os_encrypted
)
1246 os
->os_next_write_raw
[tx
->tx_txg
& TXG_MASK
] = B_TRUE
;
1248 zio
= zio_root(dp
->dp_spa
, NULL
, NULL
, ZIO_FLAG_MUSTSUCCEED
);
1249 dsl_dataset_sync(ds
, zio
, tx
);
1250 VERIFY0(zio_wait(zio
));
1252 /* dsl_dataset_sync_done will drop this reference. */
1253 dmu_buf_add_ref(ds
->ds_dbuf
, ds
);
1254 dsl_dataset_sync_done(ds
, tx
);
1259 dsl_dataset_create_sync(dsl_dir_t
*pdd
, const char *lastname
,
1260 dsl_dataset_t
*origin
, uint64_t flags
, cred_t
*cr
,
1261 dsl_crypto_params_t
*dcp
, dmu_tx_t
*tx
)
1263 dsl_pool_t
*dp
= pdd
->dd_pool
;
1264 uint64_t dsobj
, ddobj
;
1267 ASSERT(dmu_tx_is_syncing(tx
));
1268 ASSERT(lastname
[0] != '@');
1270 * Filesystems will eventually have their origin set to dp_origin_snap,
1271 * but that's taken care of in dsl_dataset_create_sync_dd. When
1272 * creating a filesystem, this function is called with origin equal to
1276 ASSERT3P(origin
, !=, dp
->dp_origin_snap
);
1278 ddobj
= dsl_dir_create_sync(dp
, pdd
, lastname
, tx
);
1279 VERIFY0(dsl_dir_hold_obj(dp
, ddobj
, lastname
, FTAG
, &dd
));
1281 dsobj
= dsl_dataset_create_sync_dd(dd
, origin
, dcp
,
1282 flags
& ~DS_CREATE_FLAG_NODIRTY
, tx
);
1284 dsl_deleg_set_create_perms(dd
, tx
, cr
);
1287 * If we are creating a clone and the livelist feature is enabled,
1288 * add the entry DD_FIELD_LIVELIST to ZAP.
1290 if (origin
!= NULL
&&
1291 spa_feature_is_enabled(dp
->dp_spa
, SPA_FEATURE_LIVELIST
)) {
1292 objset_t
*mos
= dd
->dd_pool
->dp_meta_objset
;
1293 dsl_dir_zapify(dd
, tx
);
1294 uint64_t obj
= dsl_deadlist_alloc(mos
, tx
);
1295 VERIFY0(zap_add(mos
, dd
->dd_object
, DD_FIELD_LIVELIST
,
1296 sizeof (uint64_t), 1, &obj
, tx
));
1297 spa_feature_incr(dp
->dp_spa
, SPA_FEATURE_LIVELIST
, tx
);
1301 * Since we're creating a new node we know it's a leaf, so we can
1302 * initialize the counts if the limit feature is active.
1304 if (spa_feature_is_active(dp
->dp_spa
, SPA_FEATURE_FS_SS_LIMIT
)) {
1306 objset_t
*os
= dd
->dd_pool
->dp_meta_objset
;
1308 dsl_dir_zapify(dd
, tx
);
1309 VERIFY0(zap_add(os
, dd
->dd_object
, DD_FIELD_FILESYSTEM_COUNT
,
1310 sizeof (cnt
), 1, &cnt
, tx
));
1311 VERIFY0(zap_add(os
, dd
->dd_object
, DD_FIELD_SNAPSHOT_COUNT
,
1312 sizeof (cnt
), 1, &cnt
, tx
));
1315 dsl_dir_rele(dd
, FTAG
);
1318 * If we are creating a clone, make sure we zero out any stale
1319 * data from the origin snapshots zil header.
1321 if (origin
!= NULL
&& !(flags
& DS_CREATE_FLAG_NODIRTY
)) {
1324 VERIFY0(dsl_dataset_hold_obj(dp
, dsobj
, FTAG
, &ds
));
1325 dsl_dataset_zero_zil(ds
, tx
);
1326 dsl_dataset_rele(ds
, FTAG
);
1333 * The unique space in the head dataset can be calculated by subtracting
1334 * the space used in the most recent snapshot, that is still being used
1335 * in this file system, from the space currently in use. To figure out
1336 * the space in the most recent snapshot still in use, we need to take
1337 * the total space used in the snapshot and subtract out the space that
1338 * has been freed up since the snapshot was taken.
1341 dsl_dataset_recalc_head_uniq(dsl_dataset_t
*ds
)
1344 uint64_t dlused
, dlcomp
, dluncomp
;
1346 ASSERT(!ds
->ds_is_snapshot
);
1348 if (dsl_dataset_phys(ds
)->ds_prev_snap_obj
!= 0)
1349 mrs_used
= dsl_dataset_phys(ds
->ds_prev
)->ds_referenced_bytes
;
1353 dsl_deadlist_space(&ds
->ds_deadlist
, &dlused
, &dlcomp
, &dluncomp
);
1355 ASSERT3U(dlused
, <=, mrs_used
);
1356 dsl_dataset_phys(ds
)->ds_unique_bytes
=
1357 dsl_dataset_phys(ds
)->ds_referenced_bytes
- (mrs_used
- dlused
);
1359 if (spa_version(ds
->ds_dir
->dd_pool
->dp_spa
) >=
1360 SPA_VERSION_UNIQUE_ACCURATE
)
1361 dsl_dataset_phys(ds
)->ds_flags
|= DS_FLAG_UNIQUE_ACCURATE
;
1365 dsl_dataset_remove_from_next_clones(dsl_dataset_t
*ds
, uint64_t obj
,
1368 objset_t
*mos
= ds
->ds_dir
->dd_pool
->dp_meta_objset
;
1369 ASSERTV(uint64_t count
);
1372 ASSERT(dsl_dataset_phys(ds
)->ds_num_children
>= 2);
1373 err
= zap_remove_int(mos
, dsl_dataset_phys(ds
)->ds_next_clones_obj
,
1376 * The err should not be ENOENT, but a bug in a previous version
1377 * of the code could cause upgrade_clones_cb() to not set
1378 * ds_next_snap_obj when it should, leading to a missing entry.
1379 * If we knew that the pool was created after
1380 * SPA_VERSION_NEXT_CLONES, we could assert that it isn't
1381 * ENOENT. However, at least we can check that we don't have
1382 * too many entries in the next_clones_obj even after failing to
1387 ASSERT0(zap_count(mos
, dsl_dataset_phys(ds
)->ds_next_clones_obj
,
1389 ASSERT3U(count
, <=, dsl_dataset_phys(ds
)->ds_num_children
- 2);
1394 dsl_dataset_get_blkptr(dsl_dataset_t
*ds
)
1396 return (&dsl_dataset_phys(ds
)->ds_bp
);
1400 dsl_dataset_get_spa(dsl_dataset_t
*ds
)
1402 return (ds
->ds_dir
->dd_pool
->dp_spa
);
1406 dsl_dataset_dirty(dsl_dataset_t
*ds
, dmu_tx_t
*tx
)
1410 if (ds
== NULL
) /* this is the meta-objset */
1413 ASSERT(ds
->ds_objset
!= NULL
);
1415 if (dsl_dataset_phys(ds
)->ds_next_snap_obj
!= 0)
1416 panic("dirtying snapshot!");
1418 /* Must not dirty a dataset in the same txg where it got snapshotted. */
1419 ASSERT3U(tx
->tx_txg
, >, dsl_dataset_phys(ds
)->ds_prev_snap_txg
);
1421 dp
= ds
->ds_dir
->dd_pool
;
1422 if (txg_list_add(&dp
->dp_dirty_datasets
, ds
, tx
->tx_txg
)) {
1423 objset_t
*os
= ds
->ds_objset
;
1425 /* up the hold count until we can be written out */
1426 dmu_buf_add_ref(ds
->ds_dbuf
, ds
);
1428 /* if this dataset is encrypted, grab a reference to the DCK */
1429 if (ds
->ds_dir
->dd_crypto_obj
!= 0 &&
1430 !os
->os_raw_receive
&&
1431 !os
->os_next_write_raw
[tx
->tx_txg
& TXG_MASK
]) {
1432 ASSERT3P(ds
->ds_key_mapping
, !=, NULL
);
1433 key_mapping_add_ref(ds
->ds_key_mapping
, ds
);
1439 dsl_dataset_snapshot_reserve_space(dsl_dataset_t
*ds
, dmu_tx_t
*tx
)
1443 if (!dmu_tx_is_syncing(tx
))
1447 * If there's an fs-only reservation, any blocks that might become
1448 * owned by the snapshot dataset must be accommodated by space
1449 * outside of the reservation.
1451 ASSERT(ds
->ds_reserved
== 0 || DS_UNIQUE_IS_ACCURATE(ds
));
1452 asize
= MIN(dsl_dataset_phys(ds
)->ds_unique_bytes
, ds
->ds_reserved
);
1453 if (asize
> dsl_dir_space_available(ds
->ds_dir
, NULL
, 0, TRUE
))
1454 return (SET_ERROR(ENOSPC
));
1457 * Propagate any reserved space for this snapshot to other
1458 * snapshot checks in this sync group.
1461 dsl_dir_willuse_space(ds
->ds_dir
, asize
, tx
);
1467 dsl_dataset_snapshot_check_impl(dsl_dataset_t
*ds
, const char *snapname
,
1468 dmu_tx_t
*tx
, boolean_t recv
, uint64_t cnt
, cred_t
*cr
)
1473 ds
->ds_trysnap_txg
= tx
->tx_txg
;
1475 if (!dmu_tx_is_syncing(tx
))
1479 * We don't allow multiple snapshots of the same txg. If there
1480 * is already one, try again.
1482 if (dsl_dataset_phys(ds
)->ds_prev_snap_txg
>= tx
->tx_txg
)
1483 return (SET_ERROR(EAGAIN
));
1486 * Check for conflicting snapshot name.
1488 error
= dsl_dataset_snap_lookup(ds
, snapname
, &value
);
1490 return (SET_ERROR(EEXIST
));
1491 if (error
!= ENOENT
)
1495 * We don't allow taking snapshots of inconsistent datasets, such as
1496 * those into which we are currently receiving. However, if we are
1497 * creating this snapshot as part of a receive, this check will be
1498 * executed atomically with respect to the completion of the receive
1499 * itself but prior to the clearing of DS_FLAG_INCONSISTENT; in this
1500 * case we ignore this, knowing it will be fixed up for us shortly in
1501 * dmu_recv_end_sync().
1503 if (!recv
&& DS_IS_INCONSISTENT(ds
))
1504 return (SET_ERROR(EBUSY
));
1507 * Skip the check for temporary snapshots or if we have already checked
1508 * the counts in dsl_dataset_snapshot_check. This means we really only
1509 * check the count here when we're receiving a stream.
1511 if (cnt
!= 0 && cr
!= NULL
) {
1512 error
= dsl_fs_ss_limit_check(ds
->ds_dir
, cnt
,
1513 ZFS_PROP_SNAPSHOT_LIMIT
, NULL
, cr
);
1518 error
= dsl_dataset_snapshot_reserve_space(ds
, tx
);
1526 dsl_dataset_snapshot_check(void *arg
, dmu_tx_t
*tx
)
1528 dsl_dataset_snapshot_arg_t
*ddsa
= arg
;
1529 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
1534 * Pre-compute how many total new snapshots will be created for each
1535 * level in the tree and below. This is needed for validating the
1536 * snapshot limit when either taking a recursive snapshot or when
1537 * taking multiple snapshots.
1539 * The problem is that the counts are not actually adjusted when
1540 * we are checking, only when we finally sync. For a single snapshot,
1541 * this is easy, the count will increase by 1 at each node up the tree,
1542 * but its more complicated for the recursive/multiple snapshot case.
1544 * The dsl_fs_ss_limit_check function does recursively check the count
1545 * at each level up the tree but since it is validating each snapshot
1546 * independently we need to be sure that we are validating the complete
1547 * count for the entire set of snapshots. We do this by rolling up the
1548 * counts for each component of the name into an nvlist and then
1549 * checking each of those cases with the aggregated count.
1551 * This approach properly handles not only the recursive snapshot
1552 * case (where we get all of those on the ddsa_snaps list) but also
1553 * the sibling case (e.g. snapshot a/b and a/c so that we will also
1554 * validate the limit on 'a' using a count of 2).
1556 * We validate the snapshot names in the third loop and only report
1559 if (dmu_tx_is_syncing(tx
)) {
1561 nvlist_t
*cnt_track
= NULL
;
1562 cnt_track
= fnvlist_alloc();
1564 nm
= kmem_alloc(MAXPATHLEN
, KM_SLEEP
);
1566 /* Rollup aggregated counts into the cnt_track list */
1567 for (pair
= nvlist_next_nvpair(ddsa
->ddsa_snaps
, NULL
);
1569 pair
= nvlist_next_nvpair(ddsa
->ddsa_snaps
, pair
)) {
1573 (void) strlcpy(nm
, nvpair_name(pair
), MAXPATHLEN
);
1574 pdelim
= strchr(nm
, '@');
1580 if (nvlist_lookup_uint64(cnt_track
, nm
,
1582 /* update existing entry */
1583 fnvlist_add_uint64(cnt_track
, nm
,
1587 fnvlist_add_uint64(cnt_track
, nm
, 1);
1590 pdelim
= strrchr(nm
, '/');
1593 } while (pdelim
!= NULL
);
1596 kmem_free(nm
, MAXPATHLEN
);
1598 /* Check aggregated counts at each level */
1599 for (pair
= nvlist_next_nvpair(cnt_track
, NULL
);
1600 pair
!= NULL
; pair
= nvlist_next_nvpair(cnt_track
, pair
)) {
1606 name
= nvpair_name(pair
);
1607 cnt
= fnvpair_value_uint64(pair
);
1610 error
= dsl_dataset_hold(dp
, name
, FTAG
, &ds
);
1612 error
= dsl_fs_ss_limit_check(ds
->ds_dir
, cnt
,
1613 ZFS_PROP_SNAPSHOT_LIMIT
, NULL
,
1615 dsl_dataset_rele(ds
, FTAG
);
1619 if (ddsa
->ddsa_errors
!= NULL
)
1620 fnvlist_add_int32(ddsa
->ddsa_errors
,
1623 /* only report one error for this check */
1627 nvlist_free(cnt_track
);
1630 for (pair
= nvlist_next_nvpair(ddsa
->ddsa_snaps
, NULL
);
1631 pair
!= NULL
; pair
= nvlist_next_nvpair(ddsa
->ddsa_snaps
, pair
)) {
1634 char *name
, *atp
= NULL
;
1635 char dsname
[ZFS_MAX_DATASET_NAME_LEN
];
1637 name
= nvpair_name(pair
);
1638 if (strlen(name
) >= ZFS_MAX_DATASET_NAME_LEN
)
1639 error
= SET_ERROR(ENAMETOOLONG
);
1641 atp
= strchr(name
, '@');
1643 error
= SET_ERROR(EINVAL
);
1645 (void) strlcpy(dsname
, name
, atp
- name
+ 1);
1648 error
= dsl_dataset_hold(dp
, dsname
, FTAG
, &ds
);
1650 /* passing 0/NULL skips dsl_fs_ss_limit_check */
1651 error
= dsl_dataset_snapshot_check_impl(ds
,
1652 atp
+ 1, tx
, B_FALSE
, 0, NULL
);
1653 dsl_dataset_rele(ds
, FTAG
);
1657 if (ddsa
->ddsa_errors
!= NULL
) {
1658 fnvlist_add_int32(ddsa
->ddsa_errors
,
1669 dsl_dataset_snapshot_sync_impl(dsl_dataset_t
*ds
, const char *snapname
,
1672 dsl_pool_t
*dp
= ds
->ds_dir
->dd_pool
;
1674 dsl_dataset_phys_t
*dsphys
;
1675 uint64_t dsobj
, crtxg
;
1676 objset_t
*mos
= dp
->dp_meta_objset
;
1677 ASSERTV(static zil_header_t zero_zil
);
1678 ASSERTV(objset_t
*os
);
1680 ASSERT(RRW_WRITE_HELD(&dp
->dp_config_rwlock
));
1683 * If we are on an old pool, the zil must not be active, in which
1684 * case it will be zeroed. Usually zil_suspend() accomplishes this.
1686 ASSERT(spa_version(dmu_tx_pool(tx
)->dp_spa
) >= SPA_VERSION_FAST_SNAP
||
1687 dmu_objset_from_ds(ds
, &os
) != 0 ||
1688 bcmp(&os
->os_phys
->os_zil_header
, &zero_zil
,
1689 sizeof (zero_zil
)) == 0);
1691 /* Should not snapshot a dirty dataset. */
1692 ASSERT(!txg_list_member(&ds
->ds_dir
->dd_pool
->dp_dirty_datasets
,
1695 dsl_fs_ss_count_adjust(ds
->ds_dir
, 1, DD_FIELD_SNAPSHOT_COUNT
, tx
);
1698 * The origin's ds_creation_txg has to be < TXG_INITIAL
1700 if (strcmp(snapname
, ORIGIN_DIR_NAME
) == 0)
1705 dsobj
= dmu_object_alloc(mos
, DMU_OT_DSL_DATASET
, 0,
1706 DMU_OT_DSL_DATASET
, sizeof (dsl_dataset_phys_t
), tx
);
1707 VERIFY0(dmu_bonus_hold(mos
, dsobj
, FTAG
, &dbuf
));
1708 dmu_buf_will_dirty(dbuf
, tx
);
1709 dsphys
= dbuf
->db_data
;
1710 bzero(dsphys
, sizeof (dsl_dataset_phys_t
));
1711 dsphys
->ds_dir_obj
= ds
->ds_dir
->dd_object
;
1712 dsphys
->ds_fsid_guid
= unique_create();
1713 (void) random_get_pseudo_bytes((void*)&dsphys
->ds_guid
,
1714 sizeof (dsphys
->ds_guid
));
1715 dsphys
->ds_prev_snap_obj
= dsl_dataset_phys(ds
)->ds_prev_snap_obj
;
1716 dsphys
->ds_prev_snap_txg
= dsl_dataset_phys(ds
)->ds_prev_snap_txg
;
1717 dsphys
->ds_next_snap_obj
= ds
->ds_object
;
1718 dsphys
->ds_num_children
= 1;
1719 dsphys
->ds_creation_time
= gethrestime_sec();
1720 dsphys
->ds_creation_txg
= crtxg
;
1721 dsphys
->ds_deadlist_obj
= dsl_dataset_phys(ds
)->ds_deadlist_obj
;
1722 dsphys
->ds_referenced_bytes
= dsl_dataset_phys(ds
)->ds_referenced_bytes
;
1723 dsphys
->ds_compressed_bytes
= dsl_dataset_phys(ds
)->ds_compressed_bytes
;
1724 dsphys
->ds_uncompressed_bytes
=
1725 dsl_dataset_phys(ds
)->ds_uncompressed_bytes
;
1726 dsphys
->ds_flags
= dsl_dataset_phys(ds
)->ds_flags
;
1727 rrw_enter(&ds
->ds_bp_rwlock
, RW_READER
, FTAG
);
1728 dsphys
->ds_bp
= dsl_dataset_phys(ds
)->ds_bp
;
1729 rrw_exit(&ds
->ds_bp_rwlock
, FTAG
);
1730 dmu_buf_rele(dbuf
, FTAG
);
1732 for (spa_feature_t f
= 0; f
< SPA_FEATURES
; f
++) {
1733 if (zfeature_active(f
, ds
->ds_feature
[f
])) {
1734 dsl_dataset_activate_feature(dsobj
, f
,
1735 ds
->ds_feature
[f
], tx
);
1739 ASSERT3U(ds
->ds_prev
!= 0, ==,
1740 dsl_dataset_phys(ds
)->ds_prev_snap_obj
!= 0);
1742 uint64_t next_clones_obj
=
1743 dsl_dataset_phys(ds
->ds_prev
)->ds_next_clones_obj
;
1744 ASSERT(dsl_dataset_phys(ds
->ds_prev
)->ds_next_snap_obj
==
1746 dsl_dataset_phys(ds
->ds_prev
)->ds_num_children
> 1);
1747 if (dsl_dataset_phys(ds
->ds_prev
)->ds_next_snap_obj
==
1749 dmu_buf_will_dirty(ds
->ds_prev
->ds_dbuf
, tx
);
1750 ASSERT3U(dsl_dataset_phys(ds
)->ds_prev_snap_txg
, ==,
1751 dsl_dataset_phys(ds
->ds_prev
)->ds_creation_txg
);
1752 dsl_dataset_phys(ds
->ds_prev
)->ds_next_snap_obj
= dsobj
;
1753 } else if (next_clones_obj
!= 0) {
1754 dsl_dataset_remove_from_next_clones(ds
->ds_prev
,
1755 dsphys
->ds_next_snap_obj
, tx
);
1756 VERIFY0(zap_add_int(mos
,
1757 next_clones_obj
, dsobj
, tx
));
1762 * If we have a reference-reservation on this dataset, we will
1763 * need to increase the amount of refreservation being charged
1764 * since our unique space is going to zero.
1766 if (ds
->ds_reserved
) {
1768 ASSERT(DS_UNIQUE_IS_ACCURATE(ds
));
1769 delta
= MIN(dsl_dataset_phys(ds
)->ds_unique_bytes
,
1771 dsl_dir_diduse_space(ds
->ds_dir
, DD_USED_REFRSRV
,
1775 dmu_buf_will_dirty(ds
->ds_dbuf
, tx
);
1776 dsl_dataset_phys(ds
)->ds_deadlist_obj
=
1777 dsl_deadlist_clone(&ds
->ds_deadlist
, UINT64_MAX
,
1778 dsl_dataset_phys(ds
)->ds_prev_snap_obj
, tx
);
1779 dsl_deadlist_close(&ds
->ds_deadlist
);
1780 dsl_deadlist_open(&ds
->ds_deadlist
, mos
,
1781 dsl_dataset_phys(ds
)->ds_deadlist_obj
);
1782 dsl_deadlist_add_key(&ds
->ds_deadlist
,
1783 dsl_dataset_phys(ds
)->ds_prev_snap_txg
, tx
);
1784 dsl_bookmark_snapshotted(ds
, tx
);
1786 if (dsl_dataset_remap_deadlist_exists(ds
)) {
1787 uint64_t remap_deadlist_obj
=
1788 dsl_dataset_get_remap_deadlist_object(ds
);
1790 * Move the remap_deadlist to the snapshot. The head
1791 * will create a new remap deadlist on demand, from
1792 * dsl_dataset_block_remapped().
1794 dsl_dataset_unset_remap_deadlist_object(ds
, tx
);
1795 dsl_deadlist_close(&ds
->ds_remap_deadlist
);
1797 dmu_object_zapify(mos
, dsobj
, DMU_OT_DSL_DATASET
, tx
);
1798 VERIFY0(zap_add(mos
, dsobj
, DS_FIELD_REMAP_DEADLIST
,
1799 sizeof (remap_deadlist_obj
), 1, &remap_deadlist_obj
, tx
));
1803 * Create a ivset guid for this snapshot if the dataset is
1804 * encrypted. This may be overridden by a raw receive. A
1805 * previous implementation of this code did not have this
1806 * field as part of the on-disk format for ZFS encryption
1807 * (see errata #4). As part of the remediation for this
1808 * issue, we ask the user to enable the bookmark_v2 feature
1809 * which is now a dependency of the encryption feature. We
1810 * use this as a heuristic to determine when the user has
1811 * elected to correct any datasets created with the old code.
1812 * As a result, we only do this step if the bookmark_v2
1813 * feature is enabled, which limits the number of states a
1814 * given pool / dataset can be in with regards to terms of
1815 * correcting the issue.
1817 if (ds
->ds_dir
->dd_crypto_obj
!= 0 &&
1818 spa_feature_is_enabled(dp
->dp_spa
, SPA_FEATURE_BOOKMARK_V2
)) {
1819 uint64_t ivset_guid
= unique_create();
1821 dmu_object_zapify(mos
, dsobj
, DMU_OT_DSL_DATASET
, tx
);
1822 VERIFY0(zap_add(mos
, dsobj
, DS_FIELD_IVSET_GUID
,
1823 sizeof (ivset_guid
), 1, &ivset_guid
, tx
));
1826 ASSERT3U(dsl_dataset_phys(ds
)->ds_prev_snap_txg
, <, tx
->tx_txg
);
1827 dsl_dataset_phys(ds
)->ds_prev_snap_obj
= dsobj
;
1828 dsl_dataset_phys(ds
)->ds_prev_snap_txg
= crtxg
;
1829 dsl_dataset_phys(ds
)->ds_unique_bytes
= 0;
1831 if (spa_version(dp
->dp_spa
) >= SPA_VERSION_UNIQUE_ACCURATE
)
1832 dsl_dataset_phys(ds
)->ds_flags
|= DS_FLAG_UNIQUE_ACCURATE
;
1834 VERIFY0(zap_add(mos
, dsl_dataset_phys(ds
)->ds_snapnames_zapobj
,
1835 snapname
, 8, 1, &dsobj
, tx
));
1838 dsl_dataset_rele(ds
->ds_prev
, ds
);
1839 VERIFY0(dsl_dataset_hold_obj(dp
,
1840 dsl_dataset_phys(ds
)->ds_prev_snap_obj
, ds
, &ds
->ds_prev
));
1842 dsl_scan_ds_snapshotted(ds
, tx
);
1844 dsl_dir_snap_cmtime_update(ds
->ds_dir
);
1846 spa_history_log_internal_ds(ds
->ds_prev
, "snapshot", tx
, "");
1850 dsl_dataset_snapshot_sync(void *arg
, dmu_tx_t
*tx
)
1852 dsl_dataset_snapshot_arg_t
*ddsa
= arg
;
1853 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
1856 for (pair
= nvlist_next_nvpair(ddsa
->ddsa_snaps
, NULL
);
1857 pair
!= NULL
; pair
= nvlist_next_nvpair(ddsa
->ddsa_snaps
, pair
)) {
1860 char dsname
[ZFS_MAX_DATASET_NAME_LEN
];
1862 name
= nvpair_name(pair
);
1863 atp
= strchr(name
, '@');
1864 (void) strlcpy(dsname
, name
, atp
- name
+ 1);
1865 VERIFY0(dsl_dataset_hold(dp
, dsname
, FTAG
, &ds
));
1867 dsl_dataset_snapshot_sync_impl(ds
, atp
+ 1, tx
);
1868 if (ddsa
->ddsa_props
!= NULL
) {
1869 dsl_props_set_sync_impl(ds
->ds_prev
,
1870 ZPROP_SRC_LOCAL
, ddsa
->ddsa_props
, tx
);
1872 zvol_create_minors(dp
->dp_spa
, nvpair_name(pair
), B_TRUE
);
1873 dsl_dataset_rele(ds
, FTAG
);
1878 * The snapshots must all be in the same pool.
1879 * All-or-nothing: if there are any failures, nothing will be modified.
1882 dsl_dataset_snapshot(nvlist_t
*snaps
, nvlist_t
*props
, nvlist_t
*errors
)
1884 dsl_dataset_snapshot_arg_t ddsa
;
1886 boolean_t needsuspend
;
1890 nvlist_t
*suspended
= NULL
;
1892 pair
= nvlist_next_nvpair(snaps
, NULL
);
1895 firstname
= nvpair_name(pair
);
1897 error
= spa_open(firstname
, &spa
, FTAG
);
1900 needsuspend
= (spa_version(spa
) < SPA_VERSION_FAST_SNAP
);
1901 spa_close(spa
, FTAG
);
1904 suspended
= fnvlist_alloc();
1905 for (pair
= nvlist_next_nvpair(snaps
, NULL
); pair
!= NULL
;
1906 pair
= nvlist_next_nvpair(snaps
, pair
)) {
1907 char fsname
[ZFS_MAX_DATASET_NAME_LEN
];
1908 char *snapname
= nvpair_name(pair
);
1912 atp
= strchr(snapname
, '@');
1914 error
= SET_ERROR(EINVAL
);
1917 (void) strlcpy(fsname
, snapname
, atp
- snapname
+ 1);
1919 error
= zil_suspend(fsname
, &cookie
);
1922 fnvlist_add_uint64(suspended
, fsname
,
1927 ddsa
.ddsa_snaps
= snaps
;
1928 ddsa
.ddsa_props
= props
;
1929 ddsa
.ddsa_errors
= errors
;
1930 ddsa
.ddsa_cr
= CRED();
1933 error
= dsl_sync_task(firstname
, dsl_dataset_snapshot_check
,
1934 dsl_dataset_snapshot_sync
, &ddsa
,
1935 fnvlist_num_pairs(snaps
) * 3, ZFS_SPACE_CHECK_NORMAL
);
1938 if (suspended
!= NULL
) {
1939 for (pair
= nvlist_next_nvpair(suspended
, NULL
); pair
!= NULL
;
1940 pair
= nvlist_next_nvpair(suspended
, pair
)) {
1941 zil_resume((void *)(uintptr_t)
1942 fnvpair_value_uint64(pair
));
1944 fnvlist_free(suspended
);
1950 typedef struct dsl_dataset_snapshot_tmp_arg
{
1951 const char *ddsta_fsname
;
1952 const char *ddsta_snapname
;
1953 minor_t ddsta_cleanup_minor
;
1954 const char *ddsta_htag
;
1955 } dsl_dataset_snapshot_tmp_arg_t
;
1958 dsl_dataset_snapshot_tmp_check(void *arg
, dmu_tx_t
*tx
)
1960 dsl_dataset_snapshot_tmp_arg_t
*ddsta
= arg
;
1961 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
1965 error
= dsl_dataset_hold(dp
, ddsta
->ddsta_fsname
, FTAG
, &ds
);
1969 /* NULL cred means no limit check for tmp snapshot */
1970 error
= dsl_dataset_snapshot_check_impl(ds
, ddsta
->ddsta_snapname
,
1971 tx
, B_FALSE
, 0, NULL
);
1973 dsl_dataset_rele(ds
, FTAG
);
1977 if (spa_version(dp
->dp_spa
) < SPA_VERSION_USERREFS
) {
1978 dsl_dataset_rele(ds
, FTAG
);
1979 return (SET_ERROR(ENOTSUP
));
1981 error
= dsl_dataset_user_hold_check_one(NULL
, ddsta
->ddsta_htag
,
1984 dsl_dataset_rele(ds
, FTAG
);
1988 dsl_dataset_rele(ds
, FTAG
);
1993 dsl_dataset_snapshot_tmp_sync(void *arg
, dmu_tx_t
*tx
)
1995 dsl_dataset_snapshot_tmp_arg_t
*ddsta
= arg
;
1996 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
1997 dsl_dataset_t
*ds
= NULL
;
1999 VERIFY0(dsl_dataset_hold(dp
, ddsta
->ddsta_fsname
, FTAG
, &ds
));
2001 dsl_dataset_snapshot_sync_impl(ds
, ddsta
->ddsta_snapname
, tx
);
2002 dsl_dataset_user_hold_sync_one(ds
->ds_prev
, ddsta
->ddsta_htag
,
2003 ddsta
->ddsta_cleanup_minor
, gethrestime_sec(), tx
);
2004 dsl_destroy_snapshot_sync_impl(ds
->ds_prev
, B_TRUE
, tx
);
2006 dsl_dataset_rele(ds
, FTAG
);
2010 dsl_dataset_snapshot_tmp(const char *fsname
, const char *snapname
,
2011 minor_t cleanup_minor
, const char *htag
)
2013 dsl_dataset_snapshot_tmp_arg_t ddsta
;
2016 boolean_t needsuspend
;
2019 ddsta
.ddsta_fsname
= fsname
;
2020 ddsta
.ddsta_snapname
= snapname
;
2021 ddsta
.ddsta_cleanup_minor
= cleanup_minor
;
2022 ddsta
.ddsta_htag
= htag
;
2024 error
= spa_open(fsname
, &spa
, FTAG
);
2027 needsuspend
= (spa_version(spa
) < SPA_VERSION_FAST_SNAP
);
2028 spa_close(spa
, FTAG
);
2031 error
= zil_suspend(fsname
, &cookie
);
2036 error
= dsl_sync_task(fsname
, dsl_dataset_snapshot_tmp_check
,
2037 dsl_dataset_snapshot_tmp_sync
, &ddsta
, 3, ZFS_SPACE_CHECK_RESERVED
);
2045 dsl_dataset_sync(dsl_dataset_t
*ds
, zio_t
*zio
, dmu_tx_t
*tx
)
2047 ASSERT(dmu_tx_is_syncing(tx
));
2048 ASSERT(ds
->ds_objset
!= NULL
);
2049 ASSERT(dsl_dataset_phys(ds
)->ds_next_snap_obj
== 0);
2052 * in case we had to change ds_fsid_guid when we opened it,
2055 dmu_buf_will_dirty(ds
->ds_dbuf
, tx
);
2056 dsl_dataset_phys(ds
)->ds_fsid_guid
= ds
->ds_fsid_guid
;
2058 if (ds
->ds_resume_bytes
[tx
->tx_txg
& TXG_MASK
] != 0) {
2059 VERIFY0(zap_update(tx
->tx_pool
->dp_meta_objset
,
2060 ds
->ds_object
, DS_FIELD_RESUME_OBJECT
, 8, 1,
2061 &ds
->ds_resume_object
[tx
->tx_txg
& TXG_MASK
], tx
));
2062 VERIFY0(zap_update(tx
->tx_pool
->dp_meta_objset
,
2063 ds
->ds_object
, DS_FIELD_RESUME_OFFSET
, 8, 1,
2064 &ds
->ds_resume_offset
[tx
->tx_txg
& TXG_MASK
], tx
));
2065 VERIFY0(zap_update(tx
->tx_pool
->dp_meta_objset
,
2066 ds
->ds_object
, DS_FIELD_RESUME_BYTES
, 8, 1,
2067 &ds
->ds_resume_bytes
[tx
->tx_txg
& TXG_MASK
], tx
));
2068 ds
->ds_resume_object
[tx
->tx_txg
& TXG_MASK
] = 0;
2069 ds
->ds_resume_offset
[tx
->tx_txg
& TXG_MASK
] = 0;
2070 ds
->ds_resume_bytes
[tx
->tx_txg
& TXG_MASK
] = 0;
2073 dmu_objset_sync(ds
->ds_objset
, zio
, tx
);
2075 for (spa_feature_t f
= 0; f
< SPA_FEATURES
; f
++) {
2076 if (zfeature_active(f
, ds
->ds_feature_activation
[f
])) {
2077 if (zfeature_active(f
, ds
->ds_feature
[f
]))
2079 dsl_dataset_activate_feature(ds
->ds_object
, f
,
2080 ds
->ds_feature_activation
[f
], tx
);
2081 ds
->ds_feature
[f
] = ds
->ds_feature_activation
[f
];
2087 * Check if the percentage of blocks shared between the clone and the
2088 * snapshot (as opposed to those that are clone only) is below a certain
2092 dsl_livelist_should_disable(dsl_dataset_t
*ds
)
2094 uint64_t used
, referenced
;
2097 used
= dsl_dir_get_usedds(ds
->ds_dir
);
2098 referenced
= dsl_get_referenced(ds
);
2099 ASSERT3U(referenced
, >=, 0);
2100 ASSERT3U(used
, >=, 0);
2101 if (referenced
== 0)
2103 percent_shared
= (100 * (referenced
- used
)) / referenced
;
2104 if (percent_shared
<= zfs_livelist_min_percent_shared
)
2110 * Check if it is possible to combine two livelist entries into one.
2111 * This is the case if the combined number of 'live' blkptrs (ALLOCs that
2112 * don't have a matching FREE) is under the maximum sublist size.
2113 * We check this by subtracting twice the total number of frees from the total
2114 * number of blkptrs. FREEs are counted twice because each FREE blkptr
2115 * will cancel out an ALLOC blkptr when the livelist is processed.
2118 dsl_livelist_should_condense(dsl_deadlist_entry_t
*first
,
2119 dsl_deadlist_entry_t
*next
)
2121 uint64_t total_free
= first
->dle_bpobj
.bpo_phys
->bpo_num_freed
+
2122 next
->dle_bpobj
.bpo_phys
->bpo_num_freed
;
2123 uint64_t total_entries
= first
->dle_bpobj
.bpo_phys
->bpo_num_blkptrs
+
2124 next
->dle_bpobj
.bpo_phys
->bpo_num_blkptrs
;
2125 if ((total_entries
- (2 * total_free
)) < zfs_livelist_max_entries
)
2130 typedef struct try_condense_arg
{
2133 } try_condense_arg_t
;
2136 * Iterate over the livelist entries, searching for a pair to condense.
2137 * A nonzero return value means stop, 0 means keep looking.
2140 dsl_livelist_try_condense(void *arg
, dsl_deadlist_entry_t
*first
)
2142 try_condense_arg_t
*tca
= arg
;
2143 spa_t
*spa
= tca
->spa
;
2144 dsl_dataset_t
*ds
= tca
->ds
;
2145 dsl_deadlist_t
*ll
= &ds
->ds_dir
->dd_livelist
;
2146 dsl_deadlist_entry_t
*next
;
2148 /* The condense thread has not yet been created at import */
2149 if (spa
->spa_livelist_condense_zthr
== NULL
)
2152 /* A condense is already in progress */
2153 if (spa
->spa_to_condense
.ds
!= NULL
)
2156 next
= AVL_NEXT(&ll
->dl_tree
, &first
->dle_node
);
2157 /* The livelist has only one entry - don't condense it */
2161 /* Next is the newest entry - don't condense it */
2162 if (AVL_NEXT(&ll
->dl_tree
, &next
->dle_node
) == NULL
)
2165 /* This pair is not ready to condense but keep looking */
2166 if (!dsl_livelist_should_condense(first
, next
))
2170 * Add a ref to prevent the dataset from being evicted while
2171 * the condense zthr or synctask are running. Ref will be
2172 * released at the end of the condense synctask
2174 dmu_buf_add_ref(ds
->ds_dbuf
, spa
);
2176 spa
->spa_to_condense
.ds
= ds
;
2177 spa
->spa_to_condense
.first
= first
;
2178 spa
->spa_to_condense
.next
= next
;
2179 spa
->spa_to_condense
.syncing
= B_FALSE
;
2180 spa
->spa_to_condense
.cancelled
= B_FALSE
;
2182 zthr_wakeup(spa
->spa_livelist_condense_zthr
);
2187 dsl_flush_pending_livelist(dsl_dataset_t
*ds
, dmu_tx_t
*tx
)
2189 dsl_dir_t
*dd
= ds
->ds_dir
;
2190 spa_t
*spa
= ds
->ds_dir
->dd_pool
->dp_spa
;
2191 dsl_deadlist_entry_t
*last
= dsl_deadlist_last(&dd
->dd_livelist
);
2193 /* Check if we need to add a new sub-livelist */
2195 /* The livelist is empty */
2196 dsl_deadlist_add_key(&dd
->dd_livelist
,
2197 tx
->tx_txg
- 1, tx
);
2198 } else if (spa_sync_pass(spa
) == 1) {
2200 * Check if the newest entry is full. If it is, make a new one.
2201 * We only do this once per sync because we could overfill a
2202 * sublist in one sync pass and don't want to add another entry
2203 * for a txg that is already represented. This ensures that
2204 * blkptrs born in the same txg are stored in the same sublist.
2206 bpobj_t bpobj
= last
->dle_bpobj
;
2207 uint64_t all
= bpobj
.bpo_phys
->bpo_num_blkptrs
;
2208 uint64_t free
= bpobj
.bpo_phys
->bpo_num_freed
;
2209 uint64_t alloc
= all
- free
;
2210 if (alloc
> zfs_livelist_max_entries
) {
2211 dsl_deadlist_add_key(&dd
->dd_livelist
,
2212 tx
->tx_txg
- 1, tx
);
2216 /* Insert each entry into the on-disk livelist */
2217 bplist_iterate(&dd
->dd_pending_allocs
,
2218 dsl_deadlist_insert_alloc_cb
, &dd
->dd_livelist
, tx
);
2219 bplist_iterate(&dd
->dd_pending_frees
,
2220 dsl_deadlist_insert_free_cb
, &dd
->dd_livelist
, tx
);
2222 /* Attempt to condense every pair of adjacent entries */
2223 try_condense_arg_t arg
= {
2227 dsl_deadlist_iterate(&dd
->dd_livelist
, dsl_livelist_try_condense
,
2232 dsl_dataset_sync_done(dsl_dataset_t
*ds
, dmu_tx_t
*tx
)
2234 objset_t
*os
= ds
->ds_objset
;
2236 bplist_iterate(&ds
->ds_pending_deadlist
,
2237 dsl_deadlist_insert_alloc_cb
, &ds
->ds_deadlist
, tx
);
2239 if (dsl_deadlist_is_open(&ds
->ds_dir
->dd_livelist
)) {
2240 dsl_flush_pending_livelist(ds
, tx
);
2241 if (dsl_livelist_should_disable(ds
)) {
2242 dsl_dir_remove_livelist(ds
->ds_dir
, tx
, B_TRUE
);
2246 dsl_bookmark_sync_done(ds
, tx
);
2248 if (os
->os_synced_dnodes
!= NULL
) {
2249 multilist_destroy(os
->os_synced_dnodes
);
2250 os
->os_synced_dnodes
= NULL
;
2253 if (os
->os_encrypted
)
2254 os
->os_next_write_raw
[tx
->tx_txg
& TXG_MASK
] = B_FALSE
;
2256 ASSERT0(os
->os_next_write_raw
[tx
->tx_txg
& TXG_MASK
]);
2258 ASSERT(!dmu_objset_is_dirty(os
, dmu_tx_get_txg(tx
)));
2260 dmu_buf_rele(ds
->ds_dbuf
, ds
);
2264 get_clones_stat_impl(dsl_dataset_t
*ds
, nvlist_t
*val
)
2267 objset_t
*mos
= ds
->ds_dir
->dd_pool
->dp_meta_objset
;
2271 ASSERT(dsl_pool_config_held(ds
->ds_dir
->dd_pool
));
2274 * There may be missing entries in ds_next_clones_obj
2275 * due to a bug in a previous version of the code.
2276 * Only trust it if it has the right number of entries.
2278 if (dsl_dataset_phys(ds
)->ds_next_clones_obj
!= 0) {
2279 VERIFY0(zap_count(mos
, dsl_dataset_phys(ds
)->ds_next_clones_obj
,
2282 if (count
!= dsl_dataset_phys(ds
)->ds_num_children
- 1) {
2285 for (zap_cursor_init(&zc
, mos
,
2286 dsl_dataset_phys(ds
)->ds_next_clones_obj
);
2287 zap_cursor_retrieve(&zc
, &za
) == 0;
2288 zap_cursor_advance(&zc
)) {
2289 dsl_dataset_t
*clone
;
2290 char buf
[ZFS_MAX_DATASET_NAME_LEN
];
2291 VERIFY0(dsl_dataset_hold_obj(ds
->ds_dir
->dd_pool
,
2292 za
.za_first_integer
, FTAG
, &clone
));
2293 dsl_dir_name(clone
->ds_dir
, buf
);
2294 fnvlist_add_boolean(val
, buf
);
2295 dsl_dataset_rele(clone
, FTAG
);
2297 zap_cursor_fini(&zc
);
2302 get_clones_stat(dsl_dataset_t
*ds
, nvlist_t
*nv
)
2304 nvlist_t
*propval
= fnvlist_alloc();
2308 * We use nvlist_alloc() instead of fnvlist_alloc() because the
2309 * latter would allocate the list with NV_UNIQUE_NAME flag.
2310 * As a result, every time a clone name is appended to the list
2311 * it would be (linearly) searched for for a duplicate name.
2312 * We already know that all clone names must be unique and we
2313 * want avoid the quadratic complexity of double-checking that
2314 * because we can have a large number of clones.
2316 VERIFY0(nvlist_alloc(&val
, 0, KM_SLEEP
));
2318 if (get_clones_stat_impl(ds
, val
) == 0) {
2319 fnvlist_add_nvlist(propval
, ZPROP_VALUE
, val
);
2320 fnvlist_add_nvlist(nv
, zfs_prop_to_name(ZFS_PROP_CLONES
),
2325 nvlist_free(propval
);
2329 * Returns a string that represents the receive resume stats token. It should
2330 * be freed with strfree().
2333 get_receive_resume_stats_impl(dsl_dataset_t
*ds
)
2335 dsl_pool_t
*dp
= ds
->ds_dir
->dd_pool
;
2337 if (dsl_dataset_has_resume_receive_state(ds
)) {
2340 uint8_t *compressed
;
2342 nvlist_t
*token_nv
= fnvlist_alloc();
2343 size_t packed_size
, compressed_size
;
2345 if (zap_lookup(dp
->dp_meta_objset
, ds
->ds_object
,
2346 DS_FIELD_RESUME_FROMGUID
, sizeof (val
), 1, &val
) == 0) {
2347 fnvlist_add_uint64(token_nv
, "fromguid", val
);
2349 if (zap_lookup(dp
->dp_meta_objset
, ds
->ds_object
,
2350 DS_FIELD_RESUME_OBJECT
, sizeof (val
), 1, &val
) == 0) {
2351 fnvlist_add_uint64(token_nv
, "object", val
);
2353 if (zap_lookup(dp
->dp_meta_objset
, ds
->ds_object
,
2354 DS_FIELD_RESUME_OFFSET
, sizeof (val
), 1, &val
) == 0) {
2355 fnvlist_add_uint64(token_nv
, "offset", val
);
2357 if (zap_lookup(dp
->dp_meta_objset
, ds
->ds_object
,
2358 DS_FIELD_RESUME_BYTES
, sizeof (val
), 1, &val
) == 0) {
2359 fnvlist_add_uint64(token_nv
, "bytes", val
);
2361 if (zap_lookup(dp
->dp_meta_objset
, ds
->ds_object
,
2362 DS_FIELD_RESUME_TOGUID
, sizeof (val
), 1, &val
) == 0) {
2363 fnvlist_add_uint64(token_nv
, "toguid", val
);
2365 char buf
[MAXNAMELEN
];
2366 if (zap_lookup(dp
->dp_meta_objset
, ds
->ds_object
,
2367 DS_FIELD_RESUME_TONAME
, 1, sizeof (buf
), buf
) == 0) {
2368 fnvlist_add_string(token_nv
, "toname", buf
);
2370 if (zap_contains(dp
->dp_meta_objset
, ds
->ds_object
,
2371 DS_FIELD_RESUME_LARGEBLOCK
) == 0) {
2372 fnvlist_add_boolean(token_nv
, "largeblockok");
2374 if (zap_contains(dp
->dp_meta_objset
, ds
->ds_object
,
2375 DS_FIELD_RESUME_EMBEDOK
) == 0) {
2376 fnvlist_add_boolean(token_nv
, "embedok");
2378 if (zap_contains(dp
->dp_meta_objset
, ds
->ds_object
,
2379 DS_FIELD_RESUME_COMPRESSOK
) == 0) {
2380 fnvlist_add_boolean(token_nv
, "compressok");
2382 if (zap_contains(dp
->dp_meta_objset
, ds
->ds_object
,
2383 DS_FIELD_RESUME_RAWOK
) == 0) {
2384 fnvlist_add_boolean(token_nv
, "rawok");
2386 if (dsl_dataset_feature_is_active(ds
,
2387 SPA_FEATURE_REDACTED_DATASETS
)) {
2388 uint64_t num_redact_snaps
;
2389 uint64_t *redact_snaps
;
2390 VERIFY(dsl_dataset_get_uint64_array_feature(ds
,
2391 SPA_FEATURE_REDACTED_DATASETS
, &num_redact_snaps
,
2393 fnvlist_add_uint64_array(token_nv
, "redact_snaps",
2394 redact_snaps
, num_redact_snaps
);
2396 if (zap_contains(dp
->dp_meta_objset
, ds
->ds_object
,
2397 DS_FIELD_RESUME_REDACT_BOOKMARK_SNAPS
) == 0) {
2398 uint64_t num_redact_snaps
, int_size
;
2399 uint64_t *redact_snaps
;
2400 VERIFY0(zap_length(dp
->dp_meta_objset
, ds
->ds_object
,
2401 DS_FIELD_RESUME_REDACT_BOOKMARK_SNAPS
, &int_size
,
2402 &num_redact_snaps
));
2403 ASSERT3U(int_size
, ==, sizeof (uint64_t));
2405 redact_snaps
= kmem_alloc(int_size
* num_redact_snaps
,
2407 VERIFY0(zap_lookup(dp
->dp_meta_objset
, ds
->ds_object
,
2408 DS_FIELD_RESUME_REDACT_BOOKMARK_SNAPS
, int_size
,
2409 num_redact_snaps
, redact_snaps
));
2410 fnvlist_add_uint64_array(token_nv
, "book_redact_snaps",
2411 redact_snaps
, num_redact_snaps
);
2412 kmem_free(redact_snaps
, int_size
* num_redact_snaps
);
2414 packed
= fnvlist_pack(token_nv
, &packed_size
);
2415 fnvlist_free(token_nv
);
2416 compressed
= kmem_alloc(packed_size
, KM_SLEEP
);
2418 compressed_size
= gzip_compress(packed
, compressed
,
2419 packed_size
, packed_size
, 6);
2422 fletcher_4_native_varsize(compressed
, compressed_size
, &cksum
);
2424 str
= kmem_alloc(compressed_size
* 2 + 1, KM_SLEEP
);
2425 for (int i
= 0; i
< compressed_size
; i
++) {
2426 (void) sprintf(str
+ i
* 2, "%02x", compressed
[i
]);
2428 str
[compressed_size
* 2] = '\0';
2429 char *propval
= kmem_asprintf("%u-%llx-%llx-%s",
2430 ZFS_SEND_RESUME_TOKEN_VERSION
,
2431 (longlong_t
)cksum
.zc_word
[0],
2432 (longlong_t
)packed_size
, str
);
2433 kmem_free(packed
, packed_size
);
2434 kmem_free(str
, compressed_size
* 2 + 1);
2435 kmem_free(compressed
, packed_size
);
2438 return (strdup(""));
2442 * Returns a string that represents the receive resume stats token of the
2443 * dataset's child. It should be freed with strfree().
2446 get_child_receive_stats(dsl_dataset_t
*ds
)
2448 char recvname
[ZFS_MAX_DATASET_NAME_LEN
+ 6];
2449 dsl_dataset_t
*recv_ds
;
2450 dsl_dataset_name(ds
, recvname
);
2451 if (strlcat(recvname
, "/", sizeof (recvname
)) <
2452 sizeof (recvname
) &&
2453 strlcat(recvname
, recv_clone_name
, sizeof (recvname
)) <
2454 sizeof (recvname
) &&
2455 dsl_dataset_hold(ds
->ds_dir
->dd_pool
, recvname
, FTAG
,
2457 char *propval
= get_receive_resume_stats_impl(recv_ds
);
2458 dsl_dataset_rele(recv_ds
, FTAG
);
2461 return (strdup(""));
2465 get_receive_resume_stats(dsl_dataset_t
*ds
, nvlist_t
*nv
)
2467 char *propval
= get_receive_resume_stats_impl(ds
);
2468 if (strcmp(propval
, "") != 0) {
2469 dsl_prop_nvlist_add_string(nv
,
2470 ZFS_PROP_RECEIVE_RESUME_TOKEN
, propval
);
2472 char *childval
= get_child_receive_stats(ds
);
2473 if (strcmp(childval
, "") != 0) {
2474 dsl_prop_nvlist_add_string(nv
,
2475 ZFS_PROP_RECEIVE_RESUME_TOKEN
, childval
);
2483 dsl_get_refratio(dsl_dataset_t
*ds
)
2485 uint64_t ratio
= dsl_dataset_phys(ds
)->ds_compressed_bytes
== 0 ? 100 :
2486 (dsl_dataset_phys(ds
)->ds_uncompressed_bytes
* 100 /
2487 dsl_dataset_phys(ds
)->ds_compressed_bytes
);
2492 dsl_get_logicalreferenced(dsl_dataset_t
*ds
)
2494 return (dsl_dataset_phys(ds
)->ds_uncompressed_bytes
);
2498 dsl_get_compressratio(dsl_dataset_t
*ds
)
2500 if (ds
->ds_is_snapshot
) {
2501 return (dsl_get_refratio(ds
));
2503 dsl_dir_t
*dd
= ds
->ds_dir
;
2504 mutex_enter(&dd
->dd_lock
);
2505 uint64_t val
= dsl_dir_get_compressratio(dd
);
2506 mutex_exit(&dd
->dd_lock
);
2512 dsl_get_used(dsl_dataset_t
*ds
)
2514 if (ds
->ds_is_snapshot
) {
2515 return (dsl_dataset_phys(ds
)->ds_unique_bytes
);
2517 dsl_dir_t
*dd
= ds
->ds_dir
;
2518 mutex_enter(&dd
->dd_lock
);
2519 uint64_t val
= dsl_dir_get_used(dd
);
2520 mutex_exit(&dd
->dd_lock
);
2526 dsl_get_creation(dsl_dataset_t
*ds
)
2528 return (dsl_dataset_phys(ds
)->ds_creation_time
);
2532 dsl_get_creationtxg(dsl_dataset_t
*ds
)
2534 return (dsl_dataset_phys(ds
)->ds_creation_txg
);
2538 dsl_get_refquota(dsl_dataset_t
*ds
)
2540 return (ds
->ds_quota
);
2544 dsl_get_refreservation(dsl_dataset_t
*ds
)
2546 return (ds
->ds_reserved
);
2550 dsl_get_guid(dsl_dataset_t
*ds
)
2552 return (dsl_dataset_phys(ds
)->ds_guid
);
2556 dsl_get_unique(dsl_dataset_t
*ds
)
2558 return (dsl_dataset_phys(ds
)->ds_unique_bytes
);
2562 dsl_get_objsetid(dsl_dataset_t
*ds
)
2564 return (ds
->ds_object
);
2568 dsl_get_userrefs(dsl_dataset_t
*ds
)
2570 return (ds
->ds_userrefs
);
2574 dsl_get_defer_destroy(dsl_dataset_t
*ds
)
2576 return (DS_IS_DEFER_DESTROY(ds
) ? 1 : 0);
2580 dsl_get_referenced(dsl_dataset_t
*ds
)
2582 return (dsl_dataset_phys(ds
)->ds_referenced_bytes
);
2586 dsl_get_numclones(dsl_dataset_t
*ds
)
2588 ASSERT(ds
->ds_is_snapshot
);
2589 return (dsl_dataset_phys(ds
)->ds_num_children
- 1);
2593 dsl_get_inconsistent(dsl_dataset_t
*ds
)
2595 return ((dsl_dataset_phys(ds
)->ds_flags
& DS_FLAG_INCONSISTENT
) ?
2600 dsl_get_redacted(dsl_dataset_t
*ds
)
2602 return (dsl_dataset_feature_is_active(ds
,
2603 SPA_FEATURE_REDACTED_DATASETS
));
2607 dsl_get_available(dsl_dataset_t
*ds
)
2609 uint64_t refdbytes
= dsl_get_referenced(ds
);
2610 uint64_t availbytes
= dsl_dir_space_available(ds
->ds_dir
,
2612 if (ds
->ds_reserved
> dsl_dataset_phys(ds
)->ds_unique_bytes
) {
2614 ds
->ds_reserved
- dsl_dataset_phys(ds
)->ds_unique_bytes
;
2616 if (ds
->ds_quota
!= 0) {
2618 * Adjust available bytes according to refquota
2620 if (refdbytes
< ds
->ds_quota
) {
2621 availbytes
= MIN(availbytes
,
2622 ds
->ds_quota
- refdbytes
);
2627 return (availbytes
);
2631 dsl_get_written(dsl_dataset_t
*ds
, uint64_t *written
)
2633 dsl_pool_t
*dp
= ds
->ds_dir
->dd_pool
;
2634 dsl_dataset_t
*prev
;
2635 int err
= dsl_dataset_hold_obj(dp
,
2636 dsl_dataset_phys(ds
)->ds_prev_snap_obj
, FTAG
, &prev
);
2638 uint64_t comp
, uncomp
;
2639 err
= dsl_dataset_space_written(prev
, ds
, written
,
2641 dsl_dataset_rele(prev
, FTAG
);
2647 * 'snap' should be a buffer of size ZFS_MAX_DATASET_NAME_LEN.
2650 dsl_get_prev_snap(dsl_dataset_t
*ds
, char *snap
)
2652 dsl_pool_t
*dp
= ds
->ds_dir
->dd_pool
;
2653 if (ds
->ds_prev
!= NULL
&& ds
->ds_prev
!= dp
->dp_origin_snap
) {
2654 dsl_dataset_name(ds
->ds_prev
, snap
);
2662 dsl_get_redact_snaps(dsl_dataset_t
*ds
, nvlist_t
*propval
)
2666 if (dsl_dataset_get_uint64_array_feature(ds
,
2667 SPA_FEATURE_REDACTED_DATASETS
, &nsnaps
, &snaps
)) {
2668 fnvlist_add_uint64_array(propval
, ZPROP_VALUE
, snaps
,
2674 * Returns the mountpoint property and source for the given dataset in the value
2675 * and source buffers. The value buffer must be at least as large as MAXPATHLEN
2676 * and the source buffer as least as large a ZFS_MAX_DATASET_NAME_LEN.
2677 * Returns 0 on success and an error on failure.
2680 dsl_get_mountpoint(dsl_dataset_t
*ds
, const char *dsname
, char *value
,
2684 dsl_pool_t
*dp
= ds
->ds_dir
->dd_pool
;
2686 /* Retrieve the mountpoint value stored in the zap opbject */
2687 error
= dsl_prop_get_ds(ds
, zfs_prop_to_name(ZFS_PROP_MOUNTPOINT
), 1,
2688 ZAP_MAXVALUELEN
, value
, source
);
2694 * Process the dsname and source to find the full mountpoint string.
2695 * Can be skipped for 'legacy' or 'none'.
2697 if (value
[0] == '/') {
2698 char *buf
= kmem_alloc(ZAP_MAXVALUELEN
, KM_SLEEP
);
2700 const char *relpath
;
2703 * If we inherit the mountpoint, even from a dataset
2704 * with a received value, the source will be the path of
2705 * the dataset we inherit from. If source is
2706 * ZPROP_SOURCE_VAL_RECVD, the received value is not
2709 if (strcmp(source
, ZPROP_SOURCE_VAL_RECVD
) == 0) {
2712 ASSERT0(strncmp(dsname
, source
, strlen(source
)));
2713 relpath
= dsname
+ strlen(source
);
2714 if (relpath
[0] == '/')
2718 spa_altroot(dp
->dp_spa
, root
, ZAP_MAXVALUELEN
);
2721 * Special case an alternate root of '/'. This will
2722 * avoid having multiple leading slashes in the
2725 if (strcmp(root
, "/") == 0)
2729 * If the mountpoint is '/' then skip over this
2730 * if we are obtaining either an alternate root or
2731 * an inherited mountpoint.
2734 if (value
[1] == '\0' && (root
[0] != '\0' ||
2735 relpath
[0] != '\0'))
2738 if (relpath
[0] == '\0') {
2739 (void) snprintf(value
, ZAP_MAXVALUELEN
, "%s%s",
2742 (void) snprintf(value
, ZAP_MAXVALUELEN
, "%s%s%s%s",
2743 root
, mnt
, relpath
[0] == '@' ? "" : "/",
2746 kmem_free(buf
, ZAP_MAXVALUELEN
);
2753 dsl_dataset_stats(dsl_dataset_t
*ds
, nvlist_t
*nv
)
2755 dsl_pool_t
*dp
= ds
->ds_dir
->dd_pool
;
2757 ASSERT(dsl_pool_config_held(dp
));
2759 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_REFRATIO
,
2760 dsl_get_refratio(ds
));
2761 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_LOGICALREFERENCED
,
2762 dsl_get_logicalreferenced(ds
));
2763 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_COMPRESSRATIO
,
2764 dsl_get_compressratio(ds
));
2765 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_USED
,
2768 if (ds
->ds_is_snapshot
) {
2769 get_clones_stat(ds
, nv
);
2771 char buf
[ZFS_MAX_DATASET_NAME_LEN
];
2772 if (dsl_get_prev_snap(ds
, buf
) == 0)
2773 dsl_prop_nvlist_add_string(nv
, ZFS_PROP_PREV_SNAP
,
2775 dsl_dir_stats(ds
->ds_dir
, nv
);
2778 nvlist_t
*propval
= fnvlist_alloc();
2779 dsl_get_redact_snaps(ds
, propval
);
2780 fnvlist_add_nvlist(nv
, zfs_prop_to_name(ZFS_PROP_REDACT_SNAPS
),
2782 nvlist_free(propval
);
2784 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_AVAILABLE
,
2785 dsl_get_available(ds
));
2786 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_REFERENCED
,
2787 dsl_get_referenced(ds
));
2788 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_CREATION
,
2789 dsl_get_creation(ds
));
2790 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_CREATETXG
,
2791 dsl_get_creationtxg(ds
));
2792 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_REFQUOTA
,
2793 dsl_get_refquota(ds
));
2794 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_REFRESERVATION
,
2795 dsl_get_refreservation(ds
));
2796 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_GUID
,
2798 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_UNIQUE
,
2799 dsl_get_unique(ds
));
2800 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_OBJSETID
,
2801 dsl_get_objsetid(ds
));
2802 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_USERREFS
,
2803 dsl_get_userrefs(ds
));
2804 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_DEFER_DESTROY
,
2805 dsl_get_defer_destroy(ds
));
2806 dsl_dataset_crypt_stats(ds
, nv
);
2808 if (dsl_dataset_phys(ds
)->ds_prev_snap_obj
!= 0) {
2810 if (dsl_get_written(ds
, &written
) == 0) {
2811 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_WRITTEN
,
2816 if (!dsl_dataset_is_snapshot(ds
)) {
2818 * A failed "newfs" (e.g. full) resumable receive leaves
2819 * the stats set on this dataset. Check here for the prop.
2821 get_receive_resume_stats(ds
, nv
);
2824 * A failed incremental resumable receive leaves the
2825 * stats set on our child named "%recv". Check the child
2828 /* 6 extra bytes for /%recv */
2829 char recvname
[ZFS_MAX_DATASET_NAME_LEN
+ 6];
2830 dsl_dataset_t
*recv_ds
;
2831 dsl_dataset_name(ds
, recvname
);
2832 if (strlcat(recvname
, "/", sizeof (recvname
)) <
2833 sizeof (recvname
) &&
2834 strlcat(recvname
, recv_clone_name
, sizeof (recvname
)) <
2835 sizeof (recvname
) &&
2836 dsl_dataset_hold(dp
, recvname
, FTAG
, &recv_ds
) == 0) {
2837 get_receive_resume_stats(recv_ds
, nv
);
2838 dsl_dataset_rele(recv_ds
, FTAG
);
2844 dsl_dataset_fast_stat(dsl_dataset_t
*ds
, dmu_objset_stats_t
*stat
)
2846 ASSERTV(dsl_pool_t
*dp
= ds
->ds_dir
->dd_pool
);
2847 ASSERT(dsl_pool_config_held(dp
));
2849 stat
->dds_creation_txg
= dsl_get_creationtxg(ds
);
2850 stat
->dds_inconsistent
= dsl_get_inconsistent(ds
);
2851 stat
->dds_guid
= dsl_get_guid(ds
);
2852 stat
->dds_redacted
= dsl_get_redacted(ds
);
2853 stat
->dds_origin
[0] = '\0';
2854 if (ds
->ds_is_snapshot
) {
2855 stat
->dds_is_snapshot
= B_TRUE
;
2856 stat
->dds_num_clones
= dsl_get_numclones(ds
);
2858 stat
->dds_is_snapshot
= B_FALSE
;
2859 stat
->dds_num_clones
= 0;
2861 if (dsl_dir_is_clone(ds
->ds_dir
)) {
2862 dsl_dir_get_origin(ds
->ds_dir
, stat
->dds_origin
);
2868 dsl_dataset_fsid_guid(dsl_dataset_t
*ds
)
2870 return (ds
->ds_fsid_guid
);
2874 dsl_dataset_space(dsl_dataset_t
*ds
,
2875 uint64_t *refdbytesp
, uint64_t *availbytesp
,
2876 uint64_t *usedobjsp
, uint64_t *availobjsp
)
2878 *refdbytesp
= dsl_dataset_phys(ds
)->ds_referenced_bytes
;
2879 *availbytesp
= dsl_dir_space_available(ds
->ds_dir
, NULL
, 0, TRUE
);
2880 if (ds
->ds_reserved
> dsl_dataset_phys(ds
)->ds_unique_bytes
)
2882 ds
->ds_reserved
- dsl_dataset_phys(ds
)->ds_unique_bytes
;
2883 if (ds
->ds_quota
!= 0) {
2885 * Adjust available bytes according to refquota
2887 if (*refdbytesp
< ds
->ds_quota
)
2888 *availbytesp
= MIN(*availbytesp
,
2889 ds
->ds_quota
- *refdbytesp
);
2893 rrw_enter(&ds
->ds_bp_rwlock
, RW_READER
, FTAG
);
2894 *usedobjsp
= BP_GET_FILL(&dsl_dataset_phys(ds
)->ds_bp
);
2895 rrw_exit(&ds
->ds_bp_rwlock
, FTAG
);
2896 *availobjsp
= DN_MAX_OBJECT
- *usedobjsp
;
2900 dsl_dataset_modified_since_snap(dsl_dataset_t
*ds
, dsl_dataset_t
*snap
)
2902 ASSERTV(dsl_pool_t
*dp
= ds
->ds_dir
->dd_pool
);
2905 ASSERT(dsl_pool_config_held(dp
));
2908 rrw_enter(&ds
->ds_bp_rwlock
, RW_READER
, FTAG
);
2909 birth
= dsl_dataset_get_blkptr(ds
)->blk_birth
;
2910 rrw_exit(&ds
->ds_bp_rwlock
, FTAG
);
2911 if (birth
> dsl_dataset_phys(snap
)->ds_creation_txg
) {
2912 objset_t
*os
, *os_snap
;
2914 * It may be that only the ZIL differs, because it was
2915 * reset in the head. Don't count that as being
2918 if (dmu_objset_from_ds(ds
, &os
) != 0)
2920 if (dmu_objset_from_ds(snap
, &os_snap
) != 0)
2922 return (bcmp(&os
->os_phys
->os_meta_dnode
,
2923 &os_snap
->os_phys
->os_meta_dnode
,
2924 sizeof (os
->os_phys
->os_meta_dnode
)) != 0);
2929 typedef struct dsl_dataset_rename_snapshot_arg
{
2930 const char *ddrsa_fsname
;
2931 const char *ddrsa_oldsnapname
;
2932 const char *ddrsa_newsnapname
;
2933 boolean_t ddrsa_recursive
;
2935 } dsl_dataset_rename_snapshot_arg_t
;
2939 dsl_dataset_rename_snapshot_check_impl(dsl_pool_t
*dp
,
2940 dsl_dataset_t
*hds
, void *arg
)
2942 dsl_dataset_rename_snapshot_arg_t
*ddrsa
= arg
;
2946 error
= dsl_dataset_snap_lookup(hds
, ddrsa
->ddrsa_oldsnapname
, &val
);
2948 /* ignore nonexistent snapshots */
2949 return (error
== ENOENT
? 0 : error
);
2952 /* new name should not exist */
2953 error
= dsl_dataset_snap_lookup(hds
, ddrsa
->ddrsa_newsnapname
, &val
);
2955 error
= SET_ERROR(EEXIST
);
2956 else if (error
== ENOENT
)
2959 /* dataset name + 1 for the "@" + the new snapshot name must fit */
2960 if (dsl_dir_namelen(hds
->ds_dir
) + 1 +
2961 strlen(ddrsa
->ddrsa_newsnapname
) >= ZFS_MAX_DATASET_NAME_LEN
)
2962 error
= SET_ERROR(ENAMETOOLONG
);
2968 dsl_dataset_rename_snapshot_check(void *arg
, dmu_tx_t
*tx
)
2970 dsl_dataset_rename_snapshot_arg_t
*ddrsa
= arg
;
2971 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
2975 error
= dsl_dataset_hold(dp
, ddrsa
->ddrsa_fsname
, FTAG
, &hds
);
2979 if (ddrsa
->ddrsa_recursive
) {
2980 error
= dmu_objset_find_dp(dp
, hds
->ds_dir
->dd_object
,
2981 dsl_dataset_rename_snapshot_check_impl
, ddrsa
,
2984 error
= dsl_dataset_rename_snapshot_check_impl(dp
, hds
, ddrsa
);
2986 dsl_dataset_rele(hds
, FTAG
);
2991 dsl_dataset_rename_snapshot_sync_impl(dsl_pool_t
*dp
,
2992 dsl_dataset_t
*hds
, void *arg
)
2994 dsl_dataset_rename_snapshot_arg_t
*ddrsa
= arg
;
2997 dmu_tx_t
*tx
= ddrsa
->ddrsa_tx
;
3000 error
= dsl_dataset_snap_lookup(hds
, ddrsa
->ddrsa_oldsnapname
, &val
);
3001 ASSERT(error
== 0 || error
== ENOENT
);
3002 if (error
== ENOENT
) {
3003 /* ignore nonexistent snapshots */
3007 VERIFY0(dsl_dataset_hold_obj(dp
, val
, FTAG
, &ds
));
3009 /* log before we change the name */
3010 spa_history_log_internal_ds(ds
, "rename", tx
,
3011 "-> @%s", ddrsa
->ddrsa_newsnapname
);
3013 VERIFY0(dsl_dataset_snap_remove(hds
, ddrsa
->ddrsa_oldsnapname
, tx
,
3015 mutex_enter(&ds
->ds_lock
);
3016 (void) strlcpy(ds
->ds_snapname
, ddrsa
->ddrsa_newsnapname
,
3017 sizeof (ds
->ds_snapname
));
3018 mutex_exit(&ds
->ds_lock
);
3019 VERIFY0(zap_add(dp
->dp_meta_objset
,
3020 dsl_dataset_phys(hds
)->ds_snapnames_zapobj
,
3021 ds
->ds_snapname
, 8, 1, &ds
->ds_object
, tx
));
3022 zvol_rename_minors(dp
->dp_spa
, ddrsa
->ddrsa_oldsnapname
,
3023 ddrsa
->ddrsa_newsnapname
, B_TRUE
);
3025 dsl_dataset_rele(ds
, FTAG
);
3030 dsl_dataset_rename_snapshot_sync(void *arg
, dmu_tx_t
*tx
)
3032 dsl_dataset_rename_snapshot_arg_t
*ddrsa
= arg
;
3033 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
3034 dsl_dataset_t
*hds
= NULL
;
3036 VERIFY0(dsl_dataset_hold(dp
, ddrsa
->ddrsa_fsname
, FTAG
, &hds
));
3037 ddrsa
->ddrsa_tx
= tx
;
3038 if (ddrsa
->ddrsa_recursive
) {
3039 VERIFY0(dmu_objset_find_dp(dp
, hds
->ds_dir
->dd_object
,
3040 dsl_dataset_rename_snapshot_sync_impl
, ddrsa
,
3043 VERIFY0(dsl_dataset_rename_snapshot_sync_impl(dp
, hds
, ddrsa
));
3045 dsl_dataset_rele(hds
, FTAG
);
3049 dsl_dataset_rename_snapshot(const char *fsname
,
3050 const char *oldsnapname
, const char *newsnapname
, boolean_t recursive
)
3052 dsl_dataset_rename_snapshot_arg_t ddrsa
;
3054 ddrsa
.ddrsa_fsname
= fsname
;
3055 ddrsa
.ddrsa_oldsnapname
= oldsnapname
;
3056 ddrsa
.ddrsa_newsnapname
= newsnapname
;
3057 ddrsa
.ddrsa_recursive
= recursive
;
3059 return (dsl_sync_task(fsname
, dsl_dataset_rename_snapshot_check
,
3060 dsl_dataset_rename_snapshot_sync
, &ddrsa
,
3061 1, ZFS_SPACE_CHECK_RESERVED
));
3065 * If we're doing an ownership handoff, we need to make sure that there is
3066 * only one long hold on the dataset. We're not allowed to change anything here
3067 * so we don't permanently release the long hold or regular hold here. We want
3068 * to do this only when syncing to avoid the dataset unexpectedly going away
3069 * when we release the long hold.
3072 dsl_dataset_handoff_check(dsl_dataset_t
*ds
, void *owner
, dmu_tx_t
*tx
)
3076 if (!dmu_tx_is_syncing(tx
))
3079 if (owner
!= NULL
) {
3080 VERIFY3P(ds
->ds_owner
, ==, owner
);
3081 dsl_dataset_long_rele(ds
, owner
);
3084 held
= dsl_dataset_long_held(ds
);
3087 dsl_dataset_long_hold(ds
, owner
);
3090 return (SET_ERROR(EBUSY
));
3096 dsl_dataset_rollback_check(void *arg
, dmu_tx_t
*tx
)
3098 dsl_dataset_rollback_arg_t
*ddra
= arg
;
3099 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
3101 int64_t unused_refres_delta
;
3104 error
= dsl_dataset_hold(dp
, ddra
->ddra_fsname
, FTAG
, &ds
);
3108 /* must not be a snapshot */
3109 if (ds
->ds_is_snapshot
) {
3110 dsl_dataset_rele(ds
, FTAG
);
3111 return (SET_ERROR(EINVAL
));
3114 /* must have a most recent snapshot */
3115 if (dsl_dataset_phys(ds
)->ds_prev_snap_txg
< TXG_INITIAL
) {
3116 dsl_dataset_rele(ds
, FTAG
);
3117 return (SET_ERROR(ESRCH
));
3121 * No rollback to a snapshot created in the current txg, because
3122 * the rollback may dirty the dataset and create blocks that are
3123 * not reachable from the rootbp while having a birth txg that
3124 * falls into the snapshot's range.
3126 if (dmu_tx_is_syncing(tx
) &&
3127 dsl_dataset_phys(ds
)->ds_prev_snap_txg
>= tx
->tx_txg
) {
3128 dsl_dataset_rele(ds
, FTAG
);
3129 return (SET_ERROR(EAGAIN
));
3133 * If the expected target snapshot is specified, then check that
3134 * the latest snapshot is it.
3136 if (ddra
->ddra_tosnap
!= NULL
) {
3137 dsl_dataset_t
*snapds
;
3139 /* Check if the target snapshot exists at all. */
3140 error
= dsl_dataset_hold(dp
, ddra
->ddra_tosnap
, FTAG
, &snapds
);
3143 * ESRCH is used to signal that the target snapshot does
3144 * not exist, while ENOENT is used to report that
3145 * the rolled back dataset does not exist.
3146 * ESRCH is also used to cover other cases where the
3147 * target snapshot is not related to the dataset being
3148 * rolled back such as being in a different pool.
3150 if (error
== ENOENT
|| error
== EXDEV
)
3151 error
= SET_ERROR(ESRCH
);
3152 dsl_dataset_rele(ds
, FTAG
);
3155 ASSERT(snapds
->ds_is_snapshot
);
3157 /* Check if the snapshot is the latest snapshot indeed. */
3158 if (snapds
!= ds
->ds_prev
) {
3160 * Distinguish between the case where the only problem
3161 * is intervening snapshots (EEXIST) vs the snapshot
3162 * not being a valid target for rollback (ESRCH).
3164 if (snapds
->ds_dir
== ds
->ds_dir
||
3165 (dsl_dir_is_clone(ds
->ds_dir
) &&
3166 dsl_dir_phys(ds
->ds_dir
)->dd_origin_obj
==
3167 snapds
->ds_object
)) {
3168 error
= SET_ERROR(EEXIST
);
3170 error
= SET_ERROR(ESRCH
);
3172 dsl_dataset_rele(snapds
, FTAG
);
3173 dsl_dataset_rele(ds
, FTAG
);
3176 dsl_dataset_rele(snapds
, FTAG
);
3179 /* must not have any bookmarks after the most recent snapshot */
3180 if (dsl_bookmark_latest_txg(ds
) >
3181 dsl_dataset_phys(ds
)->ds_prev_snap_txg
) {
3182 dsl_dataset_rele(ds
, FTAG
);
3183 return (SET_ERROR(EEXIST
));
3186 error
= dsl_dataset_handoff_check(ds
, ddra
->ddra_owner
, tx
);
3188 dsl_dataset_rele(ds
, FTAG
);
3193 * Check if the snap we are rolling back to uses more than
3196 if (ds
->ds_quota
!= 0 &&
3197 dsl_dataset_phys(ds
->ds_prev
)->ds_referenced_bytes
> ds
->ds_quota
) {
3198 dsl_dataset_rele(ds
, FTAG
);
3199 return (SET_ERROR(EDQUOT
));
3203 * When we do the clone swap, we will temporarily use more space
3204 * due to the refreservation (the head will no longer have any
3205 * unique space, so the entire amount of the refreservation will need
3206 * to be free). We will immediately destroy the clone, freeing
3207 * this space, but the freeing happens over many txg's.
3209 unused_refres_delta
= (int64_t)MIN(ds
->ds_reserved
,
3210 dsl_dataset_phys(ds
)->ds_unique_bytes
);
3212 if (unused_refres_delta
> 0 &&
3213 unused_refres_delta
>
3214 dsl_dir_space_available(ds
->ds_dir
, NULL
, 0, TRUE
)) {
3215 dsl_dataset_rele(ds
, FTAG
);
3216 return (SET_ERROR(ENOSPC
));
3219 dsl_dataset_rele(ds
, FTAG
);
3224 dsl_dataset_rollback_sync(void *arg
, dmu_tx_t
*tx
)
3226 dsl_dataset_rollback_arg_t
*ddra
= arg
;
3227 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
3228 dsl_dataset_t
*ds
, *clone
;
3230 char namebuf
[ZFS_MAX_DATASET_NAME_LEN
];
3232 VERIFY0(dsl_dataset_hold(dp
, ddra
->ddra_fsname
, FTAG
, &ds
));
3234 dsl_dataset_name(ds
->ds_prev
, namebuf
);
3235 fnvlist_add_string(ddra
->ddra_result
, "target", namebuf
);
3237 cloneobj
= dsl_dataset_create_sync(ds
->ds_dir
, "%rollback",
3238 ds
->ds_prev
, DS_CREATE_FLAG_NODIRTY
, kcred
, NULL
, tx
);
3240 VERIFY0(dsl_dataset_hold_obj(dp
, cloneobj
, FTAG
, &clone
));
3242 dsl_dataset_clone_swap_sync_impl(clone
, ds
, tx
);
3243 dsl_dataset_zero_zil(ds
, tx
);
3245 dsl_destroy_head_sync_impl(clone
, tx
);
3247 dsl_dataset_rele(clone
, FTAG
);
3248 dsl_dataset_rele(ds
, FTAG
);
3252 * Rolls back the given filesystem or volume to the most recent snapshot.
3253 * The name of the most recent snapshot will be returned under key "target"
3254 * in the result nvlist.
3257 * - The existing dataset MUST be owned by the specified owner at entry
3258 * - Upon return, dataset will still be held by the same owner, whether we
3261 * This mode is required any time the existing filesystem is mounted. See
3262 * notes above zfs_suspend_fs() for further details.
3265 dsl_dataset_rollback(const char *fsname
, const char *tosnap
, void *owner
,
3268 dsl_dataset_rollback_arg_t ddra
;
3270 ddra
.ddra_fsname
= fsname
;
3271 ddra
.ddra_tosnap
= tosnap
;
3272 ddra
.ddra_owner
= owner
;
3273 ddra
.ddra_result
= result
;
3275 return (dsl_sync_task(fsname
, dsl_dataset_rollback_check
,
3276 dsl_dataset_rollback_sync
, &ddra
,
3277 1, ZFS_SPACE_CHECK_RESERVED
));
3280 struct promotenode
{
3285 static int snaplist_space(list_t
*l
, uint64_t mintxg
, uint64_t *spacep
);
3286 static int promote_hold(dsl_dataset_promote_arg_t
*ddpa
, dsl_pool_t
*dp
,
3288 static void promote_rele(dsl_dataset_promote_arg_t
*ddpa
, void *tag
);
3291 dsl_dataset_promote_check(void *arg
, dmu_tx_t
*tx
)
3293 dsl_dataset_promote_arg_t
*ddpa
= arg
;
3294 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
3296 struct promotenode
*snap
;
3297 dsl_dataset_t
*origin_ds
, *origin_head
;
3301 size_t max_snap_len
;
3302 boolean_t conflicting_snaps
;
3304 err
= promote_hold(ddpa
, dp
, FTAG
);
3308 hds
= ddpa
->ddpa_clone
;
3309 max_snap_len
= MAXNAMELEN
- strlen(ddpa
->ddpa_clonename
) - 1;
3311 if (dsl_dataset_phys(hds
)->ds_flags
& DS_FLAG_NOPROMOTE
) {
3312 promote_rele(ddpa
, FTAG
);
3313 return (SET_ERROR(EXDEV
));
3316 snap
= list_head(&ddpa
->shared_snaps
);
3317 origin_head
= snap
->ds
;
3319 err
= SET_ERROR(ENOENT
);
3322 origin_ds
= snap
->ds
;
3325 * Encrypted clones share a DSL Crypto Key with their origin's dsl dir.
3326 * When doing a promote we must make sure the encryption root for
3327 * both the target and the target's origin does not change to avoid
3328 * needing to rewrap encryption keys
3330 err
= dsl_dataset_promote_crypt_check(hds
->ds_dir
, origin_ds
->ds_dir
);
3335 * Compute and check the amount of space to transfer. Since this is
3336 * so expensive, don't do the preliminary check.
3338 if (!dmu_tx_is_syncing(tx
)) {
3339 promote_rele(ddpa
, FTAG
);
3343 /* compute origin's new unique space */
3344 snap
= list_tail(&ddpa
->clone_snaps
);
3345 ASSERT(snap
!= NULL
);
3346 ASSERT3U(dsl_dataset_phys(snap
->ds
)->ds_prev_snap_obj
, ==,
3347 origin_ds
->ds_object
);
3348 dsl_deadlist_space_range(&snap
->ds
->ds_deadlist
,
3349 dsl_dataset_phys(origin_ds
)->ds_prev_snap_txg
, UINT64_MAX
,
3350 &ddpa
->unique
, &unused
, &unused
);
3353 * Walk the snapshots that we are moving
3355 * Compute space to transfer. Consider the incremental changes
3356 * to used by each snapshot:
3357 * (my used) = (prev's used) + (blocks born) - (blocks killed)
3358 * So each snapshot gave birth to:
3359 * (blocks born) = (my used) - (prev's used) + (blocks killed)
3360 * So a sequence would look like:
3361 * (uN - u(N-1) + kN) + ... + (u1 - u0 + k1) + (u0 - 0 + k0)
3362 * Which simplifies to:
3363 * uN + kN + kN-1 + ... + k1 + k0
3364 * Note however, if we stop before we reach the ORIGIN we get:
3365 * uN + kN + kN-1 + ... + kM - uM-1
3367 conflicting_snaps
= B_FALSE
;
3369 ddpa
->used
= dsl_dataset_phys(origin_ds
)->ds_referenced_bytes
;
3370 ddpa
->comp
= dsl_dataset_phys(origin_ds
)->ds_compressed_bytes
;
3371 ddpa
->uncomp
= dsl_dataset_phys(origin_ds
)->ds_uncompressed_bytes
;
3372 for (snap
= list_head(&ddpa
->shared_snaps
); snap
;
3373 snap
= list_next(&ddpa
->shared_snaps
, snap
)) {
3374 uint64_t val
, dlused
, dlcomp
, dluncomp
;
3375 dsl_dataset_t
*ds
= snap
->ds
;
3380 * If there are long holds, we won't be able to evict
3383 if (dsl_dataset_long_held(ds
)) {
3384 err
= SET_ERROR(EBUSY
);
3388 /* Check that the snapshot name does not conflict */
3389 VERIFY0(dsl_dataset_get_snapname(ds
));
3390 if (strlen(ds
->ds_snapname
) >= max_snap_len
) {
3391 err
= SET_ERROR(ENAMETOOLONG
);
3394 err
= dsl_dataset_snap_lookup(hds
, ds
->ds_snapname
, &val
);
3396 fnvlist_add_boolean(ddpa
->err_ds
,
3397 snap
->ds
->ds_snapname
);
3398 conflicting_snaps
= B_TRUE
;
3399 } else if (err
!= ENOENT
) {
3403 /* The very first snapshot does not have a deadlist */
3404 if (dsl_dataset_phys(ds
)->ds_prev_snap_obj
== 0)
3407 dsl_deadlist_space(&ds
->ds_deadlist
,
3408 &dlused
, &dlcomp
, &dluncomp
);
3409 ddpa
->used
+= dlused
;
3410 ddpa
->comp
+= dlcomp
;
3411 ddpa
->uncomp
+= dluncomp
;
3415 * Check that bookmarks that are being transferred don't have
3418 for (dsl_bookmark_node_t
*dbn
= avl_first(&origin_head
->ds_bookmarks
);
3419 dbn
!= NULL
&& dbn
->dbn_phys
.zbm_creation_txg
<=
3420 dsl_dataset_phys(origin_ds
)->ds_creation_txg
;
3421 dbn
= AVL_NEXT(&origin_head
->ds_bookmarks
, dbn
)) {
3422 if (strlen(dbn
->dbn_name
) >= max_snap_len
) {
3423 err
= SET_ERROR(ENAMETOOLONG
);
3426 zfs_bookmark_phys_t bm
;
3427 err
= dsl_bookmark_lookup_impl(ddpa
->ddpa_clone
,
3428 dbn
->dbn_name
, &bm
);
3431 fnvlist_add_boolean(ddpa
->err_ds
, dbn
->dbn_name
);
3432 conflicting_snaps
= B_TRUE
;
3433 } else if (err
== ESRCH
) {
3435 } else if (err
!= 0) {
3441 * In order to return the full list of conflicting snapshots, we check
3442 * whether there was a conflict after traversing all of them.
3444 if (conflicting_snaps
) {
3445 err
= SET_ERROR(EEXIST
);
3450 * If we are a clone of a clone then we never reached ORIGIN,
3451 * so we need to subtract out the clone origin's used space.
3453 if (ddpa
->origin_origin
) {
3455 dsl_dataset_phys(ddpa
->origin_origin
)->ds_referenced_bytes
;
3457 dsl_dataset_phys(ddpa
->origin_origin
)->ds_compressed_bytes
;
3459 dsl_dataset_phys(ddpa
->origin_origin
)->
3460 ds_uncompressed_bytes
;
3463 /* Check that there is enough space and limit headroom here */
3464 err
= dsl_dir_transfer_possible(origin_ds
->ds_dir
, hds
->ds_dir
,
3465 0, ss_mv_cnt
, ddpa
->used
, ddpa
->cr
);
3470 * Compute the amounts of space that will be used by snapshots
3471 * after the promotion (for both origin and clone). For each,
3472 * it is the amount of space that will be on all of their
3473 * deadlists (that was not born before their new origin).
3475 if (dsl_dir_phys(hds
->ds_dir
)->dd_flags
& DD_FLAG_USED_BREAKDOWN
) {
3479 * Note, typically this will not be a clone of a clone,
3480 * so dd_origin_txg will be < TXG_INITIAL, so
3481 * these snaplist_space() -> dsl_deadlist_space_range()
3482 * calls will be fast because they do not have to
3483 * iterate over all bps.
3485 snap
= list_head(&ddpa
->origin_snaps
);
3487 err
= SET_ERROR(ENOENT
);
3490 err
= snaplist_space(&ddpa
->shared_snaps
,
3491 snap
->ds
->ds_dir
->dd_origin_txg
, &ddpa
->cloneusedsnap
);
3495 err
= snaplist_space(&ddpa
->clone_snaps
,
3496 snap
->ds
->ds_dir
->dd_origin_txg
, &space
);
3499 ddpa
->cloneusedsnap
+= space
;
3501 if (dsl_dir_phys(origin_ds
->ds_dir
)->dd_flags
&
3502 DD_FLAG_USED_BREAKDOWN
) {
3503 err
= snaplist_space(&ddpa
->origin_snaps
,
3504 dsl_dataset_phys(origin_ds
)->ds_creation_txg
,
3505 &ddpa
->originusedsnap
);
3511 promote_rele(ddpa
, FTAG
);
3516 dsl_dataset_promote_sync(void *arg
, dmu_tx_t
*tx
)
3518 dsl_dataset_promote_arg_t
*ddpa
= arg
;
3519 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
3521 struct promotenode
*snap
;
3522 dsl_dataset_t
*origin_ds
;
3523 dsl_dataset_t
*origin_head
;
3525 dsl_dir_t
*odd
= NULL
;
3526 uint64_t oldnext_obj
;
3529 ASSERT(nvlist_empty(ddpa
->err_ds
));
3531 VERIFY0(promote_hold(ddpa
, dp
, FTAG
));
3532 hds
= ddpa
->ddpa_clone
;
3534 ASSERT0(dsl_dataset_phys(hds
)->ds_flags
& DS_FLAG_NOPROMOTE
);
3536 snap
= list_head(&ddpa
->shared_snaps
);
3537 origin_ds
= snap
->ds
;
3540 snap
= list_head(&ddpa
->origin_snaps
);
3541 origin_head
= snap
->ds
;
3544 * We need to explicitly open odd, since origin_ds's dd will be
3547 VERIFY0(dsl_dir_hold_obj(dp
, origin_ds
->ds_dir
->dd_object
,
3550 dsl_dataset_promote_crypt_sync(hds
->ds_dir
, odd
, tx
);
3552 /* change origin's next snap */
3553 dmu_buf_will_dirty(origin_ds
->ds_dbuf
, tx
);
3554 oldnext_obj
= dsl_dataset_phys(origin_ds
)->ds_next_snap_obj
;
3555 snap
= list_tail(&ddpa
->clone_snaps
);
3556 ASSERT3U(dsl_dataset_phys(snap
->ds
)->ds_prev_snap_obj
, ==,
3557 origin_ds
->ds_object
);
3558 dsl_dataset_phys(origin_ds
)->ds_next_snap_obj
= snap
->ds
->ds_object
;
3560 /* change the origin's next clone */
3561 if (dsl_dataset_phys(origin_ds
)->ds_next_clones_obj
) {
3562 dsl_dataset_remove_from_next_clones(origin_ds
,
3563 snap
->ds
->ds_object
, tx
);
3564 VERIFY0(zap_add_int(dp
->dp_meta_objset
,
3565 dsl_dataset_phys(origin_ds
)->ds_next_clones_obj
,
3570 dmu_buf_will_dirty(dd
->dd_dbuf
, tx
);
3571 ASSERT3U(dsl_dir_phys(dd
)->dd_origin_obj
, ==, origin_ds
->ds_object
);
3572 dsl_dir_phys(dd
)->dd_origin_obj
= dsl_dir_phys(odd
)->dd_origin_obj
;
3573 dd
->dd_origin_txg
= origin_head
->ds_dir
->dd_origin_txg
;
3574 dmu_buf_will_dirty(odd
->dd_dbuf
, tx
);
3575 dsl_dir_phys(odd
)->dd_origin_obj
= origin_ds
->ds_object
;
3576 origin_head
->ds_dir
->dd_origin_txg
=
3577 dsl_dataset_phys(origin_ds
)->ds_creation_txg
;
3579 /* change dd_clone entries */
3580 if (spa_version(dp
->dp_spa
) >= SPA_VERSION_DIR_CLONES
) {
3581 VERIFY0(zap_remove_int(dp
->dp_meta_objset
,
3582 dsl_dir_phys(odd
)->dd_clones
, hds
->ds_object
, tx
));
3583 VERIFY0(zap_add_int(dp
->dp_meta_objset
,
3584 dsl_dir_phys(ddpa
->origin_origin
->ds_dir
)->dd_clones
,
3585 hds
->ds_object
, tx
));
3587 VERIFY0(zap_remove_int(dp
->dp_meta_objset
,
3588 dsl_dir_phys(ddpa
->origin_origin
->ds_dir
)->dd_clones
,
3589 origin_head
->ds_object
, tx
));
3590 if (dsl_dir_phys(dd
)->dd_clones
== 0) {
3591 dsl_dir_phys(dd
)->dd_clones
=
3592 zap_create(dp
->dp_meta_objset
, DMU_OT_DSL_CLONES
,
3593 DMU_OT_NONE
, 0, tx
);
3595 VERIFY0(zap_add_int(dp
->dp_meta_objset
,
3596 dsl_dir_phys(dd
)->dd_clones
, origin_head
->ds_object
, tx
));
3600 * Move bookmarks to this dir.
3602 dsl_bookmark_node_t
*dbn_next
;
3603 for (dsl_bookmark_node_t
*dbn
= avl_first(&origin_head
->ds_bookmarks
);
3604 dbn
!= NULL
&& dbn
->dbn_phys
.zbm_creation_txg
<=
3605 dsl_dataset_phys(origin_ds
)->ds_creation_txg
;
3607 dbn_next
= AVL_NEXT(&origin_head
->ds_bookmarks
, dbn
);
3609 avl_remove(&origin_head
->ds_bookmarks
, dbn
);
3610 VERIFY0(zap_remove(dp
->dp_meta_objset
,
3611 origin_head
->ds_bookmarks_obj
, dbn
->dbn_name
, tx
));
3613 dsl_bookmark_node_add(hds
, dbn
, tx
);
3616 dsl_bookmark_next_changed(hds
, origin_ds
, tx
);
3618 /* move snapshots to this dir */
3619 for (snap
= list_head(&ddpa
->shared_snaps
); snap
;
3620 snap
= list_next(&ddpa
->shared_snaps
, snap
)) {
3621 dsl_dataset_t
*ds
= snap
->ds
;
3624 * Property callbacks are registered to a particular
3625 * dsl_dir. Since ours is changing, evict the objset
3626 * so that they will be unregistered from the old dsl_dir.
3628 if (ds
->ds_objset
) {
3629 dmu_objset_evict(ds
->ds_objset
);
3630 ds
->ds_objset
= NULL
;
3633 /* move snap name entry */
3634 VERIFY0(dsl_dataset_get_snapname(ds
));
3635 VERIFY0(dsl_dataset_snap_remove(origin_head
,
3636 ds
->ds_snapname
, tx
, B_TRUE
));
3637 VERIFY0(zap_add(dp
->dp_meta_objset
,
3638 dsl_dataset_phys(hds
)->ds_snapnames_zapobj
, ds
->ds_snapname
,
3639 8, 1, &ds
->ds_object
, tx
));
3640 dsl_fs_ss_count_adjust(hds
->ds_dir
, 1,
3641 DD_FIELD_SNAPSHOT_COUNT
, tx
);
3643 /* change containing dsl_dir */
3644 dmu_buf_will_dirty(ds
->ds_dbuf
, tx
);
3645 ASSERT3U(dsl_dataset_phys(ds
)->ds_dir_obj
, ==, odd
->dd_object
);
3646 dsl_dataset_phys(ds
)->ds_dir_obj
= dd
->dd_object
;
3647 ASSERT3P(ds
->ds_dir
, ==, odd
);
3648 dsl_dir_rele(ds
->ds_dir
, ds
);
3649 VERIFY0(dsl_dir_hold_obj(dp
, dd
->dd_object
,
3650 NULL
, ds
, &ds
->ds_dir
));
3652 /* move any clone references */
3653 if (dsl_dataset_phys(ds
)->ds_next_clones_obj
&&
3654 spa_version(dp
->dp_spa
) >= SPA_VERSION_DIR_CLONES
) {
3658 for (zap_cursor_init(&zc
, dp
->dp_meta_objset
,
3659 dsl_dataset_phys(ds
)->ds_next_clones_obj
);
3660 zap_cursor_retrieve(&zc
, &za
) == 0;
3661 zap_cursor_advance(&zc
)) {
3662 dsl_dataset_t
*cnds
;
3665 if (za
.za_first_integer
== oldnext_obj
) {
3667 * We've already moved the
3668 * origin's reference.
3673 VERIFY0(dsl_dataset_hold_obj(dp
,
3674 za
.za_first_integer
, FTAG
, &cnds
));
3675 o
= dsl_dir_phys(cnds
->ds_dir
)->
3676 dd_head_dataset_obj
;
3678 VERIFY0(zap_remove_int(dp
->dp_meta_objset
,
3679 dsl_dir_phys(odd
)->dd_clones
, o
, tx
));
3680 VERIFY0(zap_add_int(dp
->dp_meta_objset
,
3681 dsl_dir_phys(dd
)->dd_clones
, o
, tx
));
3682 dsl_dataset_rele(cnds
, FTAG
);
3684 zap_cursor_fini(&zc
);
3687 ASSERT(!dsl_prop_hascb(ds
));
3691 * Change space accounting.
3692 * Note, pa->*usedsnap and dd_used_breakdown[SNAP] will either
3693 * both be valid, or both be 0 (resulting in delta == 0). This
3694 * is true for each of {clone,origin} independently.
3697 delta
= ddpa
->cloneusedsnap
-
3698 dsl_dir_phys(dd
)->dd_used_breakdown
[DD_USED_SNAP
];
3699 ASSERT3S(delta
, >=, 0);
3700 ASSERT3U(ddpa
->used
, >=, delta
);
3701 dsl_dir_diduse_space(dd
, DD_USED_SNAP
, delta
, 0, 0, tx
);
3702 dsl_dir_diduse_space(dd
, DD_USED_HEAD
,
3703 ddpa
->used
- delta
, ddpa
->comp
, ddpa
->uncomp
, tx
);
3705 delta
= ddpa
->originusedsnap
-
3706 dsl_dir_phys(odd
)->dd_used_breakdown
[DD_USED_SNAP
];
3707 ASSERT3S(delta
, <=, 0);
3708 ASSERT3U(ddpa
->used
, >=, -delta
);
3709 dsl_dir_diduse_space(odd
, DD_USED_SNAP
, delta
, 0, 0, tx
);
3710 dsl_dir_diduse_space(odd
, DD_USED_HEAD
,
3711 -ddpa
->used
- delta
, -ddpa
->comp
, -ddpa
->uncomp
, tx
);
3713 dsl_dataset_phys(origin_ds
)->ds_unique_bytes
= ddpa
->unique
;
3716 * Since livelists are specific to a clone's origin txg, they
3717 * are no longer accurate. Destroy the livelist from the clone being
3718 * promoted. If the origin dataset is a clone, destroy its livelist
3721 dsl_dir_remove_livelist(dd
, tx
, B_TRUE
);
3722 dsl_dir_remove_livelist(origin_ds
->ds_dir
, tx
, B_TRUE
);
3724 /* log history record */
3725 spa_history_log_internal_ds(hds
, "promote", tx
, "");
3727 dsl_dir_rele(odd
, FTAG
);
3728 promote_rele(ddpa
, FTAG
);
3732 * Make a list of dsl_dataset_t's for the snapshots between first_obj
3733 * (exclusive) and last_obj (inclusive). The list will be in reverse
3734 * order (last_obj will be the list_head()). If first_obj == 0, do all
3735 * snapshots back to this dataset's origin.
3738 snaplist_make(dsl_pool_t
*dp
,
3739 uint64_t first_obj
, uint64_t last_obj
, list_t
*l
, void *tag
)
3741 uint64_t obj
= last_obj
;
3743 list_create(l
, sizeof (struct promotenode
),
3744 offsetof(struct promotenode
, link
));
3746 while (obj
!= first_obj
) {
3748 struct promotenode
*snap
;
3751 err
= dsl_dataset_hold_obj(dp
, obj
, tag
, &ds
);
3752 ASSERT(err
!= ENOENT
);
3757 first_obj
= dsl_dir_phys(ds
->ds_dir
)->dd_origin_obj
;
3759 snap
= kmem_alloc(sizeof (*snap
), KM_SLEEP
);
3761 list_insert_tail(l
, snap
);
3762 obj
= dsl_dataset_phys(ds
)->ds_prev_snap_obj
;
3769 snaplist_space(list_t
*l
, uint64_t mintxg
, uint64_t *spacep
)
3771 struct promotenode
*snap
;
3774 for (snap
= list_head(l
); snap
; snap
= list_next(l
, snap
)) {
3775 uint64_t used
, comp
, uncomp
;
3776 dsl_deadlist_space_range(&snap
->ds
->ds_deadlist
,
3777 mintxg
, UINT64_MAX
, &used
, &comp
, &uncomp
);
3784 snaplist_destroy(list_t
*l
, void *tag
)
3786 struct promotenode
*snap
;
3788 if (l
== NULL
|| !list_link_active(&l
->list_head
))
3791 while ((snap
= list_tail(l
)) != NULL
) {
3792 list_remove(l
, snap
);
3793 dsl_dataset_rele(snap
->ds
, tag
);
3794 kmem_free(snap
, sizeof (*snap
));
3800 promote_hold(dsl_dataset_promote_arg_t
*ddpa
, dsl_pool_t
*dp
, void *tag
)
3804 struct promotenode
*snap
;
3806 error
= dsl_dataset_hold(dp
, ddpa
->ddpa_clonename
, tag
,
3810 dd
= ddpa
->ddpa_clone
->ds_dir
;
3812 if (ddpa
->ddpa_clone
->ds_is_snapshot
||
3813 !dsl_dir_is_clone(dd
)) {
3814 dsl_dataset_rele(ddpa
->ddpa_clone
, tag
);
3815 return (SET_ERROR(EINVAL
));
3818 error
= snaplist_make(dp
, 0, dsl_dir_phys(dd
)->dd_origin_obj
,
3819 &ddpa
->shared_snaps
, tag
);
3823 error
= snaplist_make(dp
, 0, ddpa
->ddpa_clone
->ds_object
,
3824 &ddpa
->clone_snaps
, tag
);
3828 snap
= list_head(&ddpa
->shared_snaps
);
3829 ASSERT3U(snap
->ds
->ds_object
, ==, dsl_dir_phys(dd
)->dd_origin_obj
);
3830 error
= snaplist_make(dp
, dsl_dir_phys(dd
)->dd_origin_obj
,
3831 dsl_dir_phys(snap
->ds
->ds_dir
)->dd_head_dataset_obj
,
3832 &ddpa
->origin_snaps
, tag
);
3836 if (dsl_dir_phys(snap
->ds
->ds_dir
)->dd_origin_obj
!= 0) {
3837 error
= dsl_dataset_hold_obj(dp
,
3838 dsl_dir_phys(snap
->ds
->ds_dir
)->dd_origin_obj
,
3839 tag
, &ddpa
->origin_origin
);
3845 promote_rele(ddpa
, tag
);
3850 promote_rele(dsl_dataset_promote_arg_t
*ddpa
, void *tag
)
3852 snaplist_destroy(&ddpa
->shared_snaps
, tag
);
3853 snaplist_destroy(&ddpa
->clone_snaps
, tag
);
3854 snaplist_destroy(&ddpa
->origin_snaps
, tag
);
3855 if (ddpa
->origin_origin
!= NULL
)
3856 dsl_dataset_rele(ddpa
->origin_origin
, tag
);
3857 dsl_dataset_rele(ddpa
->ddpa_clone
, tag
);
3863 * If it fails due to a conflicting snapshot name, "conflsnap" will be filled
3864 * in with the name. (It must be at least ZFS_MAX_DATASET_NAME_LEN bytes long.)
3867 dsl_dataset_promote(const char *name
, char *conflsnap
)
3869 dsl_dataset_promote_arg_t ddpa
= { 0 };
3872 nvpair_t
*snap_pair
;
3876 * We will modify space proportional to the number of
3877 * snapshots. Compute numsnaps.
3879 error
= dmu_objset_hold(name
, FTAG
, &os
);
3882 error
= zap_count(dmu_objset_pool(os
)->dp_meta_objset
,
3883 dsl_dataset_phys(dmu_objset_ds(os
))->ds_snapnames_zapobj
,
3885 dmu_objset_rele(os
, FTAG
);
3889 ddpa
.ddpa_clonename
= name
;
3890 ddpa
.err_ds
= fnvlist_alloc();
3893 error
= dsl_sync_task(name
, dsl_dataset_promote_check
,
3894 dsl_dataset_promote_sync
, &ddpa
,
3895 2 + numsnaps
, ZFS_SPACE_CHECK_RESERVED
);
3898 * Return the first conflicting snapshot found.
3900 snap_pair
= nvlist_next_nvpair(ddpa
.err_ds
, NULL
);
3901 if (snap_pair
!= NULL
&& conflsnap
!= NULL
)
3902 (void) strcpy(conflsnap
, nvpair_name(snap_pair
));
3904 fnvlist_free(ddpa
.err_ds
);
3909 dsl_dataset_clone_swap_check_impl(dsl_dataset_t
*clone
,
3910 dsl_dataset_t
*origin_head
, boolean_t force
, void *owner
, dmu_tx_t
*tx
)
3913 * "slack" factor for received datasets with refquota set on them.
3914 * See the bottom of this function for details on its use.
3916 uint64_t refquota_slack
= (uint64_t)DMU_MAX_ACCESS
*
3917 spa_asize_inflation
;
3918 int64_t unused_refres_delta
;
3920 /* they should both be heads */
3921 if (clone
->ds_is_snapshot
||
3922 origin_head
->ds_is_snapshot
)
3923 return (SET_ERROR(EINVAL
));
3925 /* if we are not forcing, the branch point should be just before them */
3926 if (!force
&& clone
->ds_prev
!= origin_head
->ds_prev
)
3927 return (SET_ERROR(EINVAL
));
3929 /* clone should be the clone (unless they are unrelated) */
3930 if (clone
->ds_prev
!= NULL
&&
3931 clone
->ds_prev
!= clone
->ds_dir
->dd_pool
->dp_origin_snap
&&
3932 origin_head
->ds_dir
!= clone
->ds_prev
->ds_dir
)
3933 return (SET_ERROR(EINVAL
));
3935 /* the clone should be a child of the origin */
3936 if (clone
->ds_dir
->dd_parent
!= origin_head
->ds_dir
)
3937 return (SET_ERROR(EINVAL
));
3939 /* origin_head shouldn't be modified unless 'force' */
3941 dsl_dataset_modified_since_snap(origin_head
, origin_head
->ds_prev
))
3942 return (SET_ERROR(ETXTBSY
));
3944 /* origin_head should have no long holds (e.g. is not mounted) */
3945 if (dsl_dataset_handoff_check(origin_head
, owner
, tx
))
3946 return (SET_ERROR(EBUSY
));
3948 /* check amount of any unconsumed refreservation */
3949 unused_refres_delta
=
3950 (int64_t)MIN(origin_head
->ds_reserved
,
3951 dsl_dataset_phys(origin_head
)->ds_unique_bytes
) -
3952 (int64_t)MIN(origin_head
->ds_reserved
,
3953 dsl_dataset_phys(clone
)->ds_unique_bytes
);
3955 if (unused_refres_delta
> 0 &&
3956 unused_refres_delta
>
3957 dsl_dir_space_available(origin_head
->ds_dir
, NULL
, 0, TRUE
))
3958 return (SET_ERROR(ENOSPC
));
3961 * The clone can't be too much over the head's refquota.
3963 * To ensure that the entire refquota can be used, we allow one
3964 * transaction to exceed the the refquota. Therefore, this check
3965 * needs to also allow for the space referenced to be more than the
3966 * refquota. The maximum amount of space that one transaction can use
3967 * on disk is DMU_MAX_ACCESS * spa_asize_inflation. Allowing this
3968 * overage ensures that we are able to receive a filesystem that
3969 * exceeds the refquota on the source system.
3971 * So that overage is the refquota_slack we use below.
3973 if (origin_head
->ds_quota
!= 0 &&
3974 dsl_dataset_phys(clone
)->ds_referenced_bytes
>
3975 origin_head
->ds_quota
+ refquota_slack
)
3976 return (SET_ERROR(EDQUOT
));
3982 dsl_dataset_swap_remap_deadlists(dsl_dataset_t
*clone
,
3983 dsl_dataset_t
*origin
, dmu_tx_t
*tx
)
3985 uint64_t clone_remap_dl_obj
, origin_remap_dl_obj
;
3986 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
3988 ASSERT(dsl_pool_sync_context(dp
));
3990 clone_remap_dl_obj
= dsl_dataset_get_remap_deadlist_object(clone
);
3991 origin_remap_dl_obj
= dsl_dataset_get_remap_deadlist_object(origin
);
3993 if (clone_remap_dl_obj
!= 0) {
3994 dsl_deadlist_close(&clone
->ds_remap_deadlist
);
3995 dsl_dataset_unset_remap_deadlist_object(clone
, tx
);
3997 if (origin_remap_dl_obj
!= 0) {
3998 dsl_deadlist_close(&origin
->ds_remap_deadlist
);
3999 dsl_dataset_unset_remap_deadlist_object(origin
, tx
);
4002 if (clone_remap_dl_obj
!= 0) {
4003 dsl_dataset_set_remap_deadlist_object(origin
,
4004 clone_remap_dl_obj
, tx
);
4005 dsl_deadlist_open(&origin
->ds_remap_deadlist
,
4006 dp
->dp_meta_objset
, clone_remap_dl_obj
);
4008 if (origin_remap_dl_obj
!= 0) {
4009 dsl_dataset_set_remap_deadlist_object(clone
,
4010 origin_remap_dl_obj
, tx
);
4011 dsl_deadlist_open(&clone
->ds_remap_deadlist
,
4012 dp
->dp_meta_objset
, origin_remap_dl_obj
);
4017 dsl_dataset_clone_swap_sync_impl(dsl_dataset_t
*clone
,
4018 dsl_dataset_t
*origin_head
, dmu_tx_t
*tx
)
4020 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
4021 int64_t unused_refres_delta
;
4023 ASSERT(clone
->ds_reserved
== 0);
4025 * NOTE: On DEBUG kernels there could be a race between this and
4026 * the check function if spa_asize_inflation is adjusted...
4028 ASSERT(origin_head
->ds_quota
== 0 ||
4029 dsl_dataset_phys(clone
)->ds_unique_bytes
<= origin_head
->ds_quota
+
4030 DMU_MAX_ACCESS
* spa_asize_inflation
);
4031 ASSERT3P(clone
->ds_prev
, ==, origin_head
->ds_prev
);
4034 * Swap per-dataset feature flags.
4036 for (spa_feature_t f
= 0; f
< SPA_FEATURES
; f
++) {
4037 if (!(spa_feature_table
[f
].fi_flags
&
4038 ZFEATURE_FLAG_PER_DATASET
)) {
4039 ASSERT(!dsl_dataset_feature_is_active(clone
, f
));
4040 ASSERT(!dsl_dataset_feature_is_active(origin_head
, f
));
4044 boolean_t clone_inuse
= dsl_dataset_feature_is_active(clone
, f
);
4045 void *clone_feature
= clone
->ds_feature
[f
];
4046 boolean_t origin_head_inuse
=
4047 dsl_dataset_feature_is_active(origin_head
, f
);
4048 void *origin_head_feature
= origin_head
->ds_feature
[f
];
4051 dsl_dataset_deactivate_feature_impl(clone
, f
, tx
);
4052 if (origin_head_inuse
)
4053 dsl_dataset_deactivate_feature_impl(origin_head
, f
, tx
);
4056 dsl_dataset_activate_feature(origin_head
->ds_object
, f
,
4058 origin_head
->ds_feature
[f
] = clone_feature
;
4060 if (origin_head_inuse
) {
4061 dsl_dataset_activate_feature(clone
->ds_object
, f
,
4062 origin_head_feature
, tx
);
4063 clone
->ds_feature
[f
] = origin_head_feature
;
4067 dmu_buf_will_dirty(clone
->ds_dbuf
, tx
);
4068 dmu_buf_will_dirty(origin_head
->ds_dbuf
, tx
);
4070 if (clone
->ds_objset
!= NULL
) {
4071 dmu_objset_evict(clone
->ds_objset
);
4072 clone
->ds_objset
= NULL
;
4075 if (origin_head
->ds_objset
!= NULL
) {
4076 dmu_objset_evict(origin_head
->ds_objset
);
4077 origin_head
->ds_objset
= NULL
;
4080 unused_refres_delta
=
4081 (int64_t)MIN(origin_head
->ds_reserved
,
4082 dsl_dataset_phys(origin_head
)->ds_unique_bytes
) -
4083 (int64_t)MIN(origin_head
->ds_reserved
,
4084 dsl_dataset_phys(clone
)->ds_unique_bytes
);
4087 * Reset origin's unique bytes.
4090 dsl_dataset_t
*origin
= clone
->ds_prev
;
4091 uint64_t comp
, uncomp
;
4093 dmu_buf_will_dirty(origin
->ds_dbuf
, tx
);
4094 dsl_deadlist_space_range(&clone
->ds_deadlist
,
4095 dsl_dataset_phys(origin
)->ds_prev_snap_txg
, UINT64_MAX
,
4096 &dsl_dataset_phys(origin
)->ds_unique_bytes
, &comp
, &uncomp
);
4101 rrw_enter(&clone
->ds_bp_rwlock
, RW_WRITER
, FTAG
);
4102 rrw_enter(&origin_head
->ds_bp_rwlock
, RW_WRITER
, FTAG
);
4104 tmp
= dsl_dataset_phys(origin_head
)->ds_bp
;
4105 dsl_dataset_phys(origin_head
)->ds_bp
=
4106 dsl_dataset_phys(clone
)->ds_bp
;
4107 dsl_dataset_phys(clone
)->ds_bp
= tmp
;
4108 rrw_exit(&origin_head
->ds_bp_rwlock
, FTAG
);
4109 rrw_exit(&clone
->ds_bp_rwlock
, FTAG
);
4112 /* set dd_*_bytes */
4114 int64_t dused
, dcomp
, duncomp
;
4115 uint64_t cdl_used
, cdl_comp
, cdl_uncomp
;
4116 uint64_t odl_used
, odl_comp
, odl_uncomp
;
4118 ASSERT3U(dsl_dir_phys(clone
->ds_dir
)->
4119 dd_used_breakdown
[DD_USED_SNAP
], ==, 0);
4121 dsl_deadlist_space(&clone
->ds_deadlist
,
4122 &cdl_used
, &cdl_comp
, &cdl_uncomp
);
4123 dsl_deadlist_space(&origin_head
->ds_deadlist
,
4124 &odl_used
, &odl_comp
, &odl_uncomp
);
4126 dused
= dsl_dataset_phys(clone
)->ds_referenced_bytes
+
4128 (dsl_dataset_phys(origin_head
)->ds_referenced_bytes
+
4130 dcomp
= dsl_dataset_phys(clone
)->ds_compressed_bytes
+
4132 (dsl_dataset_phys(origin_head
)->ds_compressed_bytes
+
4134 duncomp
= dsl_dataset_phys(clone
)->ds_uncompressed_bytes
+
4136 (dsl_dataset_phys(origin_head
)->ds_uncompressed_bytes
+
4139 dsl_dir_diduse_space(origin_head
->ds_dir
, DD_USED_HEAD
,
4140 dused
, dcomp
, duncomp
, tx
);
4141 dsl_dir_diduse_space(clone
->ds_dir
, DD_USED_HEAD
,
4142 -dused
, -dcomp
, -duncomp
, tx
);
4145 * The difference in the space used by snapshots is the
4146 * difference in snapshot space due to the head's
4147 * deadlist (since that's the only thing that's
4148 * changing that affects the snapused).
4150 dsl_deadlist_space_range(&clone
->ds_deadlist
,
4151 origin_head
->ds_dir
->dd_origin_txg
, UINT64_MAX
,
4152 &cdl_used
, &cdl_comp
, &cdl_uncomp
);
4153 dsl_deadlist_space_range(&origin_head
->ds_deadlist
,
4154 origin_head
->ds_dir
->dd_origin_txg
, UINT64_MAX
,
4155 &odl_used
, &odl_comp
, &odl_uncomp
);
4156 dsl_dir_transfer_space(origin_head
->ds_dir
, cdl_used
- odl_used
,
4157 DD_USED_HEAD
, DD_USED_SNAP
, tx
);
4160 /* swap ds_*_bytes */
4161 SWITCH64(dsl_dataset_phys(origin_head
)->ds_referenced_bytes
,
4162 dsl_dataset_phys(clone
)->ds_referenced_bytes
);
4163 SWITCH64(dsl_dataset_phys(origin_head
)->ds_compressed_bytes
,
4164 dsl_dataset_phys(clone
)->ds_compressed_bytes
);
4165 SWITCH64(dsl_dataset_phys(origin_head
)->ds_uncompressed_bytes
,
4166 dsl_dataset_phys(clone
)->ds_uncompressed_bytes
);
4167 SWITCH64(dsl_dataset_phys(origin_head
)->ds_unique_bytes
,
4168 dsl_dataset_phys(clone
)->ds_unique_bytes
);
4170 /* apply any parent delta for change in unconsumed refreservation */
4171 dsl_dir_diduse_space(origin_head
->ds_dir
, DD_USED_REFRSRV
,
4172 unused_refres_delta
, 0, 0, tx
);
4177 dsl_deadlist_close(&clone
->ds_deadlist
);
4178 dsl_deadlist_close(&origin_head
->ds_deadlist
);
4179 SWITCH64(dsl_dataset_phys(origin_head
)->ds_deadlist_obj
,
4180 dsl_dataset_phys(clone
)->ds_deadlist_obj
);
4181 dsl_deadlist_open(&clone
->ds_deadlist
, dp
->dp_meta_objset
,
4182 dsl_dataset_phys(clone
)->ds_deadlist_obj
);
4183 dsl_deadlist_open(&origin_head
->ds_deadlist
, dp
->dp_meta_objset
,
4184 dsl_dataset_phys(origin_head
)->ds_deadlist_obj
);
4185 dsl_dataset_swap_remap_deadlists(clone
, origin_head
, tx
);
4188 * If there is a bookmark at the origin, its "next dataset" is
4189 * changing, so we need to reset its FBN.
4191 dsl_bookmark_next_changed(origin_head
, origin_head
->ds_prev
, tx
);
4193 dsl_scan_ds_clone_swapped(origin_head
, clone
, tx
);
4196 * Destroy any livelists associated with the clone or the origin,
4197 * since after the swap the corresponding livelists are no longer
4200 dsl_dir_remove_livelist(clone
->ds_dir
, tx
, B_TRUE
);
4201 dsl_dir_remove_livelist(origin_head
->ds_dir
, tx
, B_TRUE
);
4203 spa_history_log_internal_ds(clone
, "clone swap", tx
,
4204 "parent=%s", origin_head
->ds_dir
->dd_myname
);
4208 * Given a pool name and a dataset object number in that pool,
4209 * return the name of that dataset.
4212 dsl_dsobj_to_dsname(char *pname
, uint64_t obj
, char *buf
)
4218 error
= dsl_pool_hold(pname
, FTAG
, &dp
);
4222 error
= dsl_dataset_hold_obj(dp
, obj
, FTAG
, &ds
);
4224 dsl_dataset_name(ds
, buf
);
4225 dsl_dataset_rele(ds
, FTAG
);
4227 dsl_pool_rele(dp
, FTAG
);
4233 dsl_dataset_check_quota(dsl_dataset_t
*ds
, boolean_t check_quota
,
4234 uint64_t asize
, uint64_t inflight
, uint64_t *used
, uint64_t *ref_rsrv
)
4238 ASSERT3S(asize
, >, 0);
4241 * *ref_rsrv is the portion of asize that will come from any
4242 * unconsumed refreservation space.
4246 mutex_enter(&ds
->ds_lock
);
4248 * Make a space adjustment for reserved bytes.
4250 if (ds
->ds_reserved
> dsl_dataset_phys(ds
)->ds_unique_bytes
) {
4252 ds
->ds_reserved
- dsl_dataset_phys(ds
)->ds_unique_bytes
);
4254 (ds
->ds_reserved
- dsl_dataset_phys(ds
)->ds_unique_bytes
);
4256 asize
- MIN(asize
, parent_delta(ds
, asize
+ inflight
));
4259 if (!check_quota
|| ds
->ds_quota
== 0) {
4260 mutex_exit(&ds
->ds_lock
);
4264 * If they are requesting more space, and our current estimate
4265 * is over quota, they get to try again unless the actual
4266 * on-disk is over quota and there are no pending changes (which
4267 * may free up space for us).
4269 if (dsl_dataset_phys(ds
)->ds_referenced_bytes
+ inflight
>=
4272 dsl_dataset_phys(ds
)->ds_referenced_bytes
< ds
->ds_quota
)
4273 error
= SET_ERROR(ERESTART
);
4275 error
= SET_ERROR(EDQUOT
);
4277 mutex_exit(&ds
->ds_lock
);
4282 typedef struct dsl_dataset_set_qr_arg
{
4283 const char *ddsqra_name
;
4284 zprop_source_t ddsqra_source
;
4285 uint64_t ddsqra_value
;
4286 } dsl_dataset_set_qr_arg_t
;
4291 dsl_dataset_set_refquota_check(void *arg
, dmu_tx_t
*tx
)
4293 dsl_dataset_set_qr_arg_t
*ddsqra
= arg
;
4294 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
4299 if (spa_version(dp
->dp_spa
) < SPA_VERSION_REFQUOTA
)
4300 return (SET_ERROR(ENOTSUP
));
4302 error
= dsl_dataset_hold(dp
, ddsqra
->ddsqra_name
, FTAG
, &ds
);
4306 if (ds
->ds_is_snapshot
) {
4307 dsl_dataset_rele(ds
, FTAG
);
4308 return (SET_ERROR(EINVAL
));
4311 error
= dsl_prop_predict(ds
->ds_dir
,
4312 zfs_prop_to_name(ZFS_PROP_REFQUOTA
),
4313 ddsqra
->ddsqra_source
, ddsqra
->ddsqra_value
, &newval
);
4315 dsl_dataset_rele(ds
, FTAG
);
4320 dsl_dataset_rele(ds
, FTAG
);
4324 if (newval
< dsl_dataset_phys(ds
)->ds_referenced_bytes
||
4325 newval
< ds
->ds_reserved
) {
4326 dsl_dataset_rele(ds
, FTAG
);
4327 return (SET_ERROR(ENOSPC
));
4330 dsl_dataset_rele(ds
, FTAG
);
4335 dsl_dataset_set_refquota_sync(void *arg
, dmu_tx_t
*tx
)
4337 dsl_dataset_set_qr_arg_t
*ddsqra
= arg
;
4338 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
4339 dsl_dataset_t
*ds
= NULL
;
4342 VERIFY0(dsl_dataset_hold(dp
, ddsqra
->ddsqra_name
, FTAG
, &ds
));
4344 dsl_prop_set_sync_impl(ds
,
4345 zfs_prop_to_name(ZFS_PROP_REFQUOTA
),
4346 ddsqra
->ddsqra_source
, sizeof (ddsqra
->ddsqra_value
), 1,
4347 &ddsqra
->ddsqra_value
, tx
);
4349 VERIFY0(dsl_prop_get_int_ds(ds
,
4350 zfs_prop_to_name(ZFS_PROP_REFQUOTA
), &newval
));
4352 if (ds
->ds_quota
!= newval
) {
4353 dmu_buf_will_dirty(ds
->ds_dbuf
, tx
);
4354 ds
->ds_quota
= newval
;
4356 dsl_dataset_rele(ds
, FTAG
);
4360 dsl_dataset_set_refquota(const char *dsname
, zprop_source_t source
,
4363 dsl_dataset_set_qr_arg_t ddsqra
;
4365 ddsqra
.ddsqra_name
= dsname
;
4366 ddsqra
.ddsqra_source
= source
;
4367 ddsqra
.ddsqra_value
= refquota
;
4369 return (dsl_sync_task(dsname
, dsl_dataset_set_refquota_check
,
4370 dsl_dataset_set_refquota_sync
, &ddsqra
, 0,
4371 ZFS_SPACE_CHECK_EXTRA_RESERVED
));
4375 dsl_dataset_set_refreservation_check(void *arg
, dmu_tx_t
*tx
)
4377 dsl_dataset_set_qr_arg_t
*ddsqra
= arg
;
4378 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
4381 uint64_t newval
, unique
;
4383 if (spa_version(dp
->dp_spa
) < SPA_VERSION_REFRESERVATION
)
4384 return (SET_ERROR(ENOTSUP
));
4386 error
= dsl_dataset_hold(dp
, ddsqra
->ddsqra_name
, FTAG
, &ds
);
4390 if (ds
->ds_is_snapshot
) {
4391 dsl_dataset_rele(ds
, FTAG
);
4392 return (SET_ERROR(EINVAL
));
4395 error
= dsl_prop_predict(ds
->ds_dir
,
4396 zfs_prop_to_name(ZFS_PROP_REFRESERVATION
),
4397 ddsqra
->ddsqra_source
, ddsqra
->ddsqra_value
, &newval
);
4399 dsl_dataset_rele(ds
, FTAG
);
4404 * If we are doing the preliminary check in open context, the
4405 * space estimates may be inaccurate.
4407 if (!dmu_tx_is_syncing(tx
)) {
4408 dsl_dataset_rele(ds
, FTAG
);
4412 mutex_enter(&ds
->ds_lock
);
4413 if (!DS_UNIQUE_IS_ACCURATE(ds
))
4414 dsl_dataset_recalc_head_uniq(ds
);
4415 unique
= dsl_dataset_phys(ds
)->ds_unique_bytes
;
4416 mutex_exit(&ds
->ds_lock
);
4418 if (MAX(unique
, newval
) > MAX(unique
, ds
->ds_reserved
)) {
4419 uint64_t delta
= MAX(unique
, newval
) -
4420 MAX(unique
, ds
->ds_reserved
);
4423 dsl_dir_space_available(ds
->ds_dir
, NULL
, 0, B_TRUE
) ||
4424 (ds
->ds_quota
> 0 && newval
> ds
->ds_quota
)) {
4425 dsl_dataset_rele(ds
, FTAG
);
4426 return (SET_ERROR(ENOSPC
));
4430 dsl_dataset_rele(ds
, FTAG
);
4435 dsl_dataset_set_refreservation_sync_impl(dsl_dataset_t
*ds
,
4436 zprop_source_t source
, uint64_t value
, dmu_tx_t
*tx
)
4442 dsl_prop_set_sync_impl(ds
, zfs_prop_to_name(ZFS_PROP_REFRESERVATION
),
4443 source
, sizeof (value
), 1, &value
, tx
);
4445 VERIFY0(dsl_prop_get_int_ds(ds
,
4446 zfs_prop_to_name(ZFS_PROP_REFRESERVATION
), &newval
));
4448 dmu_buf_will_dirty(ds
->ds_dbuf
, tx
);
4449 mutex_enter(&ds
->ds_dir
->dd_lock
);
4450 mutex_enter(&ds
->ds_lock
);
4451 ASSERT(DS_UNIQUE_IS_ACCURATE(ds
));
4452 unique
= dsl_dataset_phys(ds
)->ds_unique_bytes
;
4453 delta
= MAX(0, (int64_t)(newval
- unique
)) -
4454 MAX(0, (int64_t)(ds
->ds_reserved
- unique
));
4455 ds
->ds_reserved
= newval
;
4456 mutex_exit(&ds
->ds_lock
);
4458 dsl_dir_diduse_space(ds
->ds_dir
, DD_USED_REFRSRV
, delta
, 0, 0, tx
);
4459 mutex_exit(&ds
->ds_dir
->dd_lock
);
4463 dsl_dataset_set_refreservation_sync(void *arg
, dmu_tx_t
*tx
)
4465 dsl_dataset_set_qr_arg_t
*ddsqra
= arg
;
4466 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
4467 dsl_dataset_t
*ds
= NULL
;
4469 VERIFY0(dsl_dataset_hold(dp
, ddsqra
->ddsqra_name
, FTAG
, &ds
));
4470 dsl_dataset_set_refreservation_sync_impl(ds
,
4471 ddsqra
->ddsqra_source
, ddsqra
->ddsqra_value
, tx
);
4472 dsl_dataset_rele(ds
, FTAG
);
4476 dsl_dataset_set_refreservation(const char *dsname
, zprop_source_t source
,
4477 uint64_t refreservation
)
4479 dsl_dataset_set_qr_arg_t ddsqra
;
4481 ddsqra
.ddsqra_name
= dsname
;
4482 ddsqra
.ddsqra_source
= source
;
4483 ddsqra
.ddsqra_value
= refreservation
;
4485 return (dsl_sync_task(dsname
, dsl_dataset_set_refreservation_check
,
4486 dsl_dataset_set_refreservation_sync
, &ddsqra
, 0,
4487 ZFS_SPACE_CHECK_EXTRA_RESERVED
));
4491 * Return (in *usedp) the amount of space referenced by "new" that was not
4492 * referenced at the time the bookmark corresponds to. "New" may be a
4493 * snapshot or a head. The bookmark must be before new, in
4494 * new's filesystem (or its origin) -- caller verifies this.
4496 * The written space is calculated by considering two components: First, we
4497 * ignore any freed space, and calculate the written as new's used space
4498 * minus old's used space. Next, we add in the amount of space that was freed
4499 * between the two time points, thus reducing new's used space relative to
4500 * old's. Specifically, this is the space that was born before
4501 * zbm_creation_txg, and freed before new (ie. on new's deadlist or a
4502 * previous deadlist).
4504 * space freed [---------------------]
4505 * snapshots ---O-------O--------O-------O------
4508 * Note, the bookmark's zbm_*_bytes_refd must be valid, but if the HAS_FBN
4509 * flag is not set, we will calculate the freed_before_next based on the
4510 * next snapshot's deadlist, rather than using zbm_*_freed_before_next_snap.
4513 dsl_dataset_space_written_impl(zfs_bookmark_phys_t
*bmp
,
4514 dsl_dataset_t
*new, uint64_t *usedp
, uint64_t *compp
, uint64_t *uncompp
)
4517 dsl_pool_t
*dp
= new->ds_dir
->dd_pool
;
4519 ASSERT(dsl_pool_config_held(dp
));
4520 if (dsl_dataset_is_snapshot(new)) {
4521 ASSERT3U(bmp
->zbm_creation_txg
, <,
4522 dsl_dataset_phys(new)->ds_creation_txg
);
4526 *usedp
+= dsl_dataset_phys(new)->ds_referenced_bytes
;
4527 *usedp
-= bmp
->zbm_referenced_bytes_refd
;
4530 *compp
+= dsl_dataset_phys(new)->ds_compressed_bytes
;
4531 *compp
-= bmp
->zbm_compressed_bytes_refd
;
4534 *uncompp
+= dsl_dataset_phys(new)->ds_uncompressed_bytes
;
4535 *uncompp
-= bmp
->zbm_uncompressed_bytes_refd
;
4537 dsl_dataset_t
*snap
= new;
4539 while (dsl_dataset_phys(snap
)->ds_prev_snap_txg
>
4540 bmp
->zbm_creation_txg
) {
4541 uint64_t used
, comp
, uncomp
;
4543 dsl_deadlist_space_range(&snap
->ds_deadlist
,
4544 0, bmp
->zbm_creation_txg
,
4545 &used
, &comp
, &uncomp
);
4550 uint64_t snapobj
= dsl_dataset_phys(snap
)->ds_prev_snap_obj
;
4552 dsl_dataset_rele(snap
, FTAG
);
4553 err
= dsl_dataset_hold_obj(dp
, snapobj
, FTAG
, &snap
);
4559 * We might not have the FBN if we are calculating written from
4560 * a snapshot (because we didn't know the correct "next" snapshot
4563 if (bmp
->zbm_flags
& ZBM_FLAG_HAS_FBN
) {
4564 *usedp
+= bmp
->zbm_referenced_freed_before_next_snap
;
4565 *compp
+= bmp
->zbm_compressed_freed_before_next_snap
;
4566 *uncompp
+= bmp
->zbm_uncompressed_freed_before_next_snap
;
4568 ASSERT3U(dsl_dataset_phys(snap
)->ds_prev_snap_txg
, ==,
4569 bmp
->zbm_creation_txg
);
4570 uint64_t used
, comp
, uncomp
;
4571 dsl_deadlist_space(&snap
->ds_deadlist
, &used
, &comp
, &uncomp
);
4577 dsl_dataset_rele(snap
, FTAG
);
4582 * Return (in *usedp) the amount of space written in new that was not
4583 * present at the time the bookmark corresponds to. New may be a
4584 * snapshot or the head. Old must be a bookmark before new, in
4585 * new's filesystem (or its origin) -- caller verifies this.
4588 dsl_dataset_space_written_bookmark(zfs_bookmark_phys_t
*bmp
,
4589 dsl_dataset_t
*new, uint64_t *usedp
, uint64_t *compp
, uint64_t *uncompp
)
4591 if (!(bmp
->zbm_flags
& ZBM_FLAG_HAS_FBN
))
4592 return (SET_ERROR(ENOTSUP
));
4593 return (dsl_dataset_space_written_impl(bmp
, new,
4594 usedp
, compp
, uncompp
));
4598 * Return (in *usedp) the amount of space written in new that is not
4599 * present in oldsnap. New may be a snapshot or the head. Old must be
4600 * a snapshot before new, in new's filesystem (or its origin). If not then
4601 * fail and return EINVAL.
4604 dsl_dataset_space_written(dsl_dataset_t
*oldsnap
, dsl_dataset_t
*new,
4605 uint64_t *usedp
, uint64_t *compp
, uint64_t *uncompp
)
4607 if (!dsl_dataset_is_before(new, oldsnap
, 0))
4608 return (SET_ERROR(EINVAL
));
4610 zfs_bookmark_phys_t zbm
= { 0 };
4611 dsl_dataset_phys_t
*dsp
= dsl_dataset_phys(oldsnap
);
4612 zbm
.zbm_guid
= dsp
->ds_guid
;
4613 zbm
.zbm_creation_txg
= dsp
->ds_creation_txg
;
4614 zbm
.zbm_creation_time
= dsp
->ds_creation_time
;
4615 zbm
.zbm_referenced_bytes_refd
= dsp
->ds_referenced_bytes
;
4616 zbm
.zbm_compressed_bytes_refd
= dsp
->ds_compressed_bytes
;
4617 zbm
.zbm_uncompressed_bytes_refd
= dsp
->ds_uncompressed_bytes
;
4620 * If oldsnap is the origin (or origin's origin, ...) of new,
4621 * we can't easily calculate the effective FBN. Therefore,
4622 * we do not set ZBM_FLAG_HAS_FBN, so that the _impl will calculate
4623 * it relative to the correct "next": the next snapshot towards "new",
4624 * rather than the next snapshot in oldsnap's dsl_dir.
4626 return (dsl_dataset_space_written_impl(&zbm
, new,
4627 usedp
, compp
, uncompp
));
4631 * Return (in *usedp) the amount of space that will be reclaimed if firstsnap,
4632 * lastsnap, and all snapshots in between are deleted.
4634 * blocks that would be freed [---------------------------]
4635 * snapshots ---O-------O--------O-------O--------O
4636 * firstsnap lastsnap
4638 * This is the set of blocks that were born after the snap before firstsnap,
4639 * (birth > firstsnap->prev_snap_txg) and died before the snap after the
4640 * last snap (ie, is on lastsnap->ds_next->ds_deadlist or an earlier deadlist).
4641 * We calculate this by iterating over the relevant deadlists (from the snap
4642 * after lastsnap, backward to the snap after firstsnap), summing up the
4643 * space on the deadlist that was born after the snap before firstsnap.
4646 dsl_dataset_space_wouldfree(dsl_dataset_t
*firstsnap
,
4647 dsl_dataset_t
*lastsnap
,
4648 uint64_t *usedp
, uint64_t *compp
, uint64_t *uncompp
)
4652 dsl_pool_t
*dp
= firstsnap
->ds_dir
->dd_pool
;
4654 ASSERT(firstsnap
->ds_is_snapshot
);
4655 ASSERT(lastsnap
->ds_is_snapshot
);
4658 * Check that the snapshots are in the same dsl_dir, and firstsnap
4659 * is before lastsnap.
4661 if (firstsnap
->ds_dir
!= lastsnap
->ds_dir
||
4662 dsl_dataset_phys(firstsnap
)->ds_creation_txg
>
4663 dsl_dataset_phys(lastsnap
)->ds_creation_txg
)
4664 return (SET_ERROR(EINVAL
));
4666 *usedp
= *compp
= *uncompp
= 0;
4668 snapobj
= dsl_dataset_phys(lastsnap
)->ds_next_snap_obj
;
4669 while (snapobj
!= firstsnap
->ds_object
) {
4671 uint64_t used
, comp
, uncomp
;
4673 err
= dsl_dataset_hold_obj(dp
, snapobj
, FTAG
, &ds
);
4677 dsl_deadlist_space_range(&ds
->ds_deadlist
,
4678 dsl_dataset_phys(firstsnap
)->ds_prev_snap_txg
, UINT64_MAX
,
4679 &used
, &comp
, &uncomp
);
4684 snapobj
= dsl_dataset_phys(ds
)->ds_prev_snap_obj
;
4685 ASSERT3U(snapobj
, !=, 0);
4686 dsl_dataset_rele(ds
, FTAG
);
4692 * Return TRUE if 'earlier' is an earlier snapshot in 'later's timeline.
4693 * For example, they could both be snapshots of the same filesystem, and
4694 * 'earlier' is before 'later'. Or 'earlier' could be the origin of
4695 * 'later's filesystem. Or 'earlier' could be an older snapshot in the origin's
4696 * filesystem. Or 'earlier' could be the origin's origin.
4698 * If non-zero, earlier_txg is used instead of earlier's ds_creation_txg.
4701 dsl_dataset_is_before(dsl_dataset_t
*later
, dsl_dataset_t
*earlier
,
4702 uint64_t earlier_txg
)
4704 dsl_pool_t
*dp
= later
->ds_dir
->dd_pool
;
4708 ASSERT(dsl_pool_config_held(dp
));
4709 ASSERT(earlier
->ds_is_snapshot
|| earlier_txg
!= 0);
4711 if (earlier_txg
== 0)
4712 earlier_txg
= dsl_dataset_phys(earlier
)->ds_creation_txg
;
4714 if (later
->ds_is_snapshot
&&
4715 earlier_txg
>= dsl_dataset_phys(later
)->ds_creation_txg
)
4718 if (later
->ds_dir
== earlier
->ds_dir
)
4722 * We check dd_origin_obj explicitly here rather than using
4723 * dsl_dir_is_clone() so that we will return TRUE if "earlier"
4724 * is $ORIGIN@$ORIGIN. dsl_dataset_space_written() depends on
4727 if (dsl_dir_phys(later
->ds_dir
)->dd_origin_obj
== 0)
4730 dsl_dataset_t
*origin
;
4731 error
= dsl_dataset_hold_obj(dp
,
4732 dsl_dir_phys(later
->ds_dir
)->dd_origin_obj
, FTAG
, &origin
);
4735 if (dsl_dataset_phys(origin
)->ds_creation_txg
== earlier_txg
&&
4736 origin
->ds_dir
== earlier
->ds_dir
) {
4737 dsl_dataset_rele(origin
, FTAG
);
4740 ret
= dsl_dataset_is_before(origin
, earlier
, earlier_txg
);
4741 dsl_dataset_rele(origin
, FTAG
);
4746 dsl_dataset_zapify(dsl_dataset_t
*ds
, dmu_tx_t
*tx
)
4748 objset_t
*mos
= ds
->ds_dir
->dd_pool
->dp_meta_objset
;
4749 dmu_object_zapify(mos
, ds
->ds_object
, DMU_OT_DSL_DATASET
, tx
);
4753 dsl_dataset_is_zapified(dsl_dataset_t
*ds
)
4755 dmu_object_info_t doi
;
4757 dmu_object_info_from_db(ds
->ds_dbuf
, &doi
);
4758 return (doi
.doi_type
== DMU_OTN_ZAP_METADATA
);
4762 dsl_dataset_has_resume_receive_state(dsl_dataset_t
*ds
)
4764 return (dsl_dataset_is_zapified(ds
) &&
4765 zap_contains(ds
->ds_dir
->dd_pool
->dp_meta_objset
,
4766 ds
->ds_object
, DS_FIELD_RESUME_TOGUID
) == 0);
4770 dsl_dataset_get_remap_deadlist_object(dsl_dataset_t
*ds
)
4772 uint64_t remap_deadlist_obj
;
4775 if (!dsl_dataset_is_zapified(ds
))
4778 err
= zap_lookup(ds
->ds_dir
->dd_pool
->dp_meta_objset
, ds
->ds_object
,
4779 DS_FIELD_REMAP_DEADLIST
, sizeof (remap_deadlist_obj
), 1,
4780 &remap_deadlist_obj
);
4783 VERIFY3S(err
, ==, ENOENT
);
4787 ASSERT(remap_deadlist_obj
!= 0);
4788 return (remap_deadlist_obj
);
4792 dsl_dataset_remap_deadlist_exists(dsl_dataset_t
*ds
)
4794 EQUIV(dsl_deadlist_is_open(&ds
->ds_remap_deadlist
),
4795 dsl_dataset_get_remap_deadlist_object(ds
) != 0);
4796 return (dsl_deadlist_is_open(&ds
->ds_remap_deadlist
));
4800 dsl_dataset_set_remap_deadlist_object(dsl_dataset_t
*ds
, uint64_t obj
,
4804 dsl_dataset_zapify(ds
, tx
);
4805 VERIFY0(zap_add(ds
->ds_dir
->dd_pool
->dp_meta_objset
, ds
->ds_object
,
4806 DS_FIELD_REMAP_DEADLIST
, sizeof (obj
), 1, &obj
, tx
));
4810 dsl_dataset_unset_remap_deadlist_object(dsl_dataset_t
*ds
, dmu_tx_t
*tx
)
4812 VERIFY0(zap_remove(ds
->ds_dir
->dd_pool
->dp_meta_objset
,
4813 ds
->ds_object
, DS_FIELD_REMAP_DEADLIST
, tx
));
4817 dsl_dataset_destroy_remap_deadlist(dsl_dataset_t
*ds
, dmu_tx_t
*tx
)
4819 uint64_t remap_deadlist_object
;
4820 spa_t
*spa
= ds
->ds_dir
->dd_pool
->dp_spa
;
4822 ASSERT(dmu_tx_is_syncing(tx
));
4823 ASSERT(dsl_dataset_remap_deadlist_exists(ds
));
4825 remap_deadlist_object
= ds
->ds_remap_deadlist
.dl_object
;
4826 dsl_deadlist_close(&ds
->ds_remap_deadlist
);
4827 dsl_deadlist_free(spa_meta_objset(spa
), remap_deadlist_object
, tx
);
4828 dsl_dataset_unset_remap_deadlist_object(ds
, tx
);
4829 spa_feature_decr(spa
, SPA_FEATURE_OBSOLETE_COUNTS
, tx
);
4833 dsl_dataset_create_remap_deadlist(dsl_dataset_t
*ds
, dmu_tx_t
*tx
)
4835 uint64_t remap_deadlist_obj
;
4836 spa_t
*spa
= ds
->ds_dir
->dd_pool
->dp_spa
;
4838 ASSERT(dmu_tx_is_syncing(tx
));
4839 ASSERT(MUTEX_HELD(&ds
->ds_remap_deadlist_lock
));
4841 * Currently we only create remap deadlists when there are indirect
4842 * vdevs with referenced mappings.
4844 ASSERT(spa_feature_is_active(spa
, SPA_FEATURE_DEVICE_REMOVAL
));
4846 remap_deadlist_obj
= dsl_deadlist_clone(
4847 &ds
->ds_deadlist
, UINT64_MAX
,
4848 dsl_dataset_phys(ds
)->ds_prev_snap_obj
, tx
);
4849 dsl_dataset_set_remap_deadlist_object(ds
,
4850 remap_deadlist_obj
, tx
);
4851 dsl_deadlist_open(&ds
->ds_remap_deadlist
, spa_meta_objset(spa
),
4852 remap_deadlist_obj
);
4853 spa_feature_incr(spa
, SPA_FEATURE_OBSOLETE_COUNTS
, tx
);
4857 dsl_dataset_activate_redaction(dsl_dataset_t
*ds
, uint64_t *redact_snaps
,
4858 uint64_t num_redact_snaps
, dmu_tx_t
*tx
)
4860 uint64_t dsobj
= ds
->ds_object
;
4861 struct feature_type_uint64_array_arg
*ftuaa
=
4862 kmem_zalloc(sizeof (*ftuaa
), KM_SLEEP
);
4863 ftuaa
->length
= (int64_t)num_redact_snaps
;
4864 if (num_redact_snaps
> 0) {
4865 ftuaa
->array
= kmem_alloc(num_redact_snaps
* sizeof (uint64_t),
4867 bcopy(redact_snaps
, ftuaa
->array
, num_redact_snaps
*
4870 dsl_dataset_activate_feature(dsobj
, SPA_FEATURE_REDACTED_DATASETS
,
4872 ds
->ds_feature
[SPA_FEATURE_REDACTED_DATASETS
] = ftuaa
;
4876 #if defined(_KERNEL)
4878 module_param(zfs_max_recordsize
, int, 0644);
4879 MODULE_PARM_DESC(zfs_max_recordsize
, "Max allowed record size");
4881 /* Limited to 1M on 32-bit platforms due to lack of virtual address space */
4882 module_param(zfs_max_recordsize
, int, 0444);
4883 MODULE_PARM_DESC(zfs_max_recordsize
, "Max allowed record size");
4886 module_param(zfs_allow_redacted_dataset_mount
, int, 0644);
4887 MODULE_PARM_DESC(zfs_allow_redacted_dataset_mount
,
4888 "Allow mounting of redacted datasets");
4890 EXPORT_SYMBOL(dsl_dataset_hold
);
4891 EXPORT_SYMBOL(dsl_dataset_hold_flags
);
4892 EXPORT_SYMBOL(dsl_dataset_hold_obj
);
4893 EXPORT_SYMBOL(dsl_dataset_hold_obj_flags
);
4894 EXPORT_SYMBOL(dsl_dataset_own
);
4895 EXPORT_SYMBOL(dsl_dataset_own_obj
);
4896 EXPORT_SYMBOL(dsl_dataset_name
);
4897 EXPORT_SYMBOL(dsl_dataset_rele
);
4898 EXPORT_SYMBOL(dsl_dataset_rele_flags
);
4899 EXPORT_SYMBOL(dsl_dataset_disown
);
4900 EXPORT_SYMBOL(dsl_dataset_tryown
);
4901 EXPORT_SYMBOL(dsl_dataset_create_sync
);
4902 EXPORT_SYMBOL(dsl_dataset_create_sync_dd
);
4903 EXPORT_SYMBOL(dsl_dataset_snapshot_check
);
4904 EXPORT_SYMBOL(dsl_dataset_snapshot_sync
);
4905 EXPORT_SYMBOL(dsl_dataset_promote
);
4906 EXPORT_SYMBOL(dsl_dataset_user_hold
);
4907 EXPORT_SYMBOL(dsl_dataset_user_release
);
4908 EXPORT_SYMBOL(dsl_dataset_get_holds
);
4909 EXPORT_SYMBOL(dsl_dataset_get_blkptr
);
4910 EXPORT_SYMBOL(dsl_dataset_get_spa
);
4911 EXPORT_SYMBOL(dsl_dataset_modified_since_snap
);
4912 EXPORT_SYMBOL(dsl_dataset_space_written
);
4913 EXPORT_SYMBOL(dsl_dataset_space_wouldfree
);
4914 EXPORT_SYMBOL(dsl_dataset_sync
);
4915 EXPORT_SYMBOL(dsl_dataset_block_born
);
4916 EXPORT_SYMBOL(dsl_dataset_block_kill
);
4917 EXPORT_SYMBOL(dsl_dataset_dirty
);
4918 EXPORT_SYMBOL(dsl_dataset_stats
);
4919 EXPORT_SYMBOL(dsl_dataset_fast_stat
);
4920 EXPORT_SYMBOL(dsl_dataset_space
);
4921 EXPORT_SYMBOL(dsl_dataset_fsid_guid
);
4922 EXPORT_SYMBOL(dsl_dsobj_to_dsname
);
4923 EXPORT_SYMBOL(dsl_dataset_check_quota
);
4924 EXPORT_SYMBOL(dsl_dataset_clone_swap_check_impl
);
4925 EXPORT_SYMBOL(dsl_dataset_clone_swap_sync_impl
);