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, 2016 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/zfs_znode.h>
50 #include <sys/zfs_onexit.h>
52 #include <sys/dsl_scan.h>
53 #include <sys/dsl_deadlist.h>
54 #include <sys/dsl_destroy.h>
55 #include <sys/dsl_userhold.h>
56 #include <sys/dsl_bookmark.h>
57 #include <sys/policy.h>
58 #include <sys/dmu_send.h>
59 #include <sys/zio_compress.h>
60 #include <zfs_fletcher.h>
61 #include <sys/zio_checksum.h>
64 * The SPA supports block sizes up to 16MB. However, very large blocks
65 * can have an impact on i/o latency (e.g. tying up a spinning disk for
66 * ~300ms), and also potentially on the memory allocator. Therefore,
67 * we do not allow the recordsize to be set larger than zfs_max_recordsize
68 * (default 1MB). Larger blocks can be created by changing this tunable,
69 * and pools with larger blocks can always be imported and used, regardless
72 int zfs_max_recordsize
= 1 * 1024 * 1024;
74 #define SWITCH64(x, y) \
76 uint64_t __tmp = (x); \
81 #define DS_REF_MAX (1ULL << 62)
83 extern inline dsl_dataset_phys_t
*dsl_dataset_phys(dsl_dataset_t
*ds
);
85 extern int spa_asize_inflation
;
87 static zil_header_t zero_zil
;
90 * Figure out how much of this delta should be propagated to the dsl_dir
91 * layer. If there's a refreservation, that space has already been
92 * partially accounted for in our ancestors.
95 parent_delta(dsl_dataset_t
*ds
, int64_t delta
)
97 dsl_dataset_phys_t
*ds_phys
;
98 uint64_t old_bytes
, new_bytes
;
100 if (ds
->ds_reserved
== 0)
103 ds_phys
= dsl_dataset_phys(ds
);
104 old_bytes
= MAX(ds_phys
->ds_unique_bytes
, ds
->ds_reserved
);
105 new_bytes
= MAX(ds_phys
->ds_unique_bytes
+ delta
, ds
->ds_reserved
);
107 ASSERT3U(ABS((int64_t)(new_bytes
- old_bytes
)), <=, ABS(delta
));
108 return (new_bytes
- old_bytes
);
112 dsl_dataset_block_born(dsl_dataset_t
*ds
, const blkptr_t
*bp
, dmu_tx_t
*tx
)
114 int used
, compressed
, uncompressed
;
117 used
= bp_get_dsize_sync(tx
->tx_pool
->dp_spa
, bp
);
118 compressed
= BP_GET_PSIZE(bp
);
119 uncompressed
= BP_GET_UCSIZE(bp
);
121 dprintf_bp(bp
, "ds=%p", ds
);
123 ASSERT(dmu_tx_is_syncing(tx
));
124 /* It could have been compressed away to nothing */
127 ASSERT(BP_GET_TYPE(bp
) != DMU_OT_NONE
);
128 ASSERT(DMU_OT_IS_VALID(BP_GET_TYPE(bp
)));
130 dsl_pool_mos_diduse_space(tx
->tx_pool
,
131 used
, compressed
, uncompressed
);
135 ASSERT3U(bp
->blk_birth
, >, dsl_dataset_phys(ds
)->ds_prev_snap_txg
);
136 dmu_buf_will_dirty(ds
->ds_dbuf
, tx
);
137 mutex_enter(&ds
->ds_lock
);
138 delta
= parent_delta(ds
, used
);
139 dsl_dataset_phys(ds
)->ds_referenced_bytes
+= used
;
140 dsl_dataset_phys(ds
)->ds_compressed_bytes
+= compressed
;
141 dsl_dataset_phys(ds
)->ds_uncompressed_bytes
+= uncompressed
;
142 dsl_dataset_phys(ds
)->ds_unique_bytes
+= used
;
144 if (BP_GET_LSIZE(bp
) > SPA_OLD_MAXBLOCKSIZE
) {
145 ds
->ds_feature_activation_needed
[SPA_FEATURE_LARGE_BLOCKS
] =
149 spa_feature_t f
= zio_checksum_to_feature(BP_GET_CHECKSUM(bp
));
150 if (f
!= SPA_FEATURE_NONE
)
151 ds
->ds_feature_activation_needed
[f
] = B_TRUE
;
153 mutex_exit(&ds
->ds_lock
);
154 dsl_dir_diduse_space(ds
->ds_dir
, DD_USED_HEAD
, delta
,
155 compressed
, uncompressed
, tx
);
156 dsl_dir_transfer_space(ds
->ds_dir
, used
- delta
,
157 DD_USED_REFRSRV
, DD_USED_HEAD
, tx
);
161 dsl_dataset_block_kill(dsl_dataset_t
*ds
, const blkptr_t
*bp
, dmu_tx_t
*tx
,
164 int used
= bp_get_dsize_sync(tx
->tx_pool
->dp_spa
, bp
);
165 int compressed
= BP_GET_PSIZE(bp
);
166 int uncompressed
= BP_GET_UCSIZE(bp
);
171 ASSERT(dmu_tx_is_syncing(tx
));
172 ASSERT(bp
->blk_birth
<= tx
->tx_txg
);
175 dsl_free(tx
->tx_pool
, tx
->tx_txg
, bp
);
176 dsl_pool_mos_diduse_space(tx
->tx_pool
,
177 -used
, -compressed
, -uncompressed
);
180 ASSERT3P(tx
->tx_pool
, ==, ds
->ds_dir
->dd_pool
);
182 ASSERT(!ds
->ds_is_snapshot
);
183 dmu_buf_will_dirty(ds
->ds_dbuf
, tx
);
185 if (bp
->blk_birth
> dsl_dataset_phys(ds
)->ds_prev_snap_txg
) {
188 dprintf_bp(bp
, "freeing ds=%llu", ds
->ds_object
);
189 dsl_free(tx
->tx_pool
, tx
->tx_txg
, bp
);
191 mutex_enter(&ds
->ds_lock
);
192 ASSERT(dsl_dataset_phys(ds
)->ds_unique_bytes
>= used
||
193 !DS_UNIQUE_IS_ACCURATE(ds
));
194 delta
= parent_delta(ds
, -used
);
195 dsl_dataset_phys(ds
)->ds_unique_bytes
-= used
;
196 mutex_exit(&ds
->ds_lock
);
197 dsl_dir_diduse_space(ds
->ds_dir
, DD_USED_HEAD
,
198 delta
, -compressed
, -uncompressed
, tx
);
199 dsl_dir_transfer_space(ds
->ds_dir
, -used
- delta
,
200 DD_USED_REFRSRV
, DD_USED_HEAD
, tx
);
202 dprintf_bp(bp
, "putting on dead list: %s", "");
205 * We are here as part of zio's write done callback,
206 * which means we're a zio interrupt thread. We can't
207 * call dsl_deadlist_insert() now because it may block
208 * waiting for I/O. Instead, put bp on the deferred
209 * queue and let dsl_pool_sync() finish the job.
211 bplist_append(&ds
->ds_pending_deadlist
, bp
);
213 dsl_deadlist_insert(&ds
->ds_deadlist
, bp
, tx
);
215 ASSERT3U(ds
->ds_prev
->ds_object
, ==,
216 dsl_dataset_phys(ds
)->ds_prev_snap_obj
);
217 ASSERT(dsl_dataset_phys(ds
->ds_prev
)->ds_num_children
> 0);
218 /* if (bp->blk_birth > prev prev snap txg) prev unique += bs */
219 if (dsl_dataset_phys(ds
->ds_prev
)->ds_next_snap_obj
==
220 ds
->ds_object
&& bp
->blk_birth
>
221 dsl_dataset_phys(ds
->ds_prev
)->ds_prev_snap_txg
) {
222 dmu_buf_will_dirty(ds
->ds_prev
->ds_dbuf
, tx
);
223 mutex_enter(&ds
->ds_prev
->ds_lock
);
224 dsl_dataset_phys(ds
->ds_prev
)->ds_unique_bytes
+= used
;
225 mutex_exit(&ds
->ds_prev
->ds_lock
);
227 if (bp
->blk_birth
> ds
->ds_dir
->dd_origin_txg
) {
228 dsl_dir_transfer_space(ds
->ds_dir
, used
,
229 DD_USED_HEAD
, DD_USED_SNAP
, tx
);
232 mutex_enter(&ds
->ds_lock
);
233 ASSERT3U(dsl_dataset_phys(ds
)->ds_referenced_bytes
, >=, used
);
234 dsl_dataset_phys(ds
)->ds_referenced_bytes
-= used
;
235 ASSERT3U(dsl_dataset_phys(ds
)->ds_compressed_bytes
, >=, compressed
);
236 dsl_dataset_phys(ds
)->ds_compressed_bytes
-= compressed
;
237 ASSERT3U(dsl_dataset_phys(ds
)->ds_uncompressed_bytes
, >=, uncompressed
);
238 dsl_dataset_phys(ds
)->ds_uncompressed_bytes
-= uncompressed
;
239 mutex_exit(&ds
->ds_lock
);
245 * We have to release the fsid syncronously or we risk that a subsequent
246 * mount of the same dataset will fail to unique_insert the fsid. This
247 * failure would manifest itself as the fsid of this dataset changing
248 * between mounts which makes NFS clients quite unhappy.
251 dsl_dataset_evict_sync(void *dbu
)
253 dsl_dataset_t
*ds
= dbu
;
255 ASSERT(ds
->ds_owner
== NULL
);
257 unique_remove(ds
->ds_fsid_guid
);
261 dsl_dataset_evict_async(void *dbu
)
263 dsl_dataset_t
*ds
= dbu
;
265 ASSERT(ds
->ds_owner
== NULL
);
269 if (ds
->ds_objset
!= NULL
)
270 dmu_objset_evict(ds
->ds_objset
);
273 dsl_dataset_rele(ds
->ds_prev
, ds
);
277 bplist_destroy(&ds
->ds_pending_deadlist
);
278 if (ds
->ds_deadlist
.dl_os
!= NULL
)
279 dsl_deadlist_close(&ds
->ds_deadlist
);
281 dsl_dir_async_rele(ds
->ds_dir
, ds
);
283 ASSERT(!list_link_active(&ds
->ds_synced_link
));
285 list_destroy(&ds
->ds_prop_cbs
);
286 mutex_destroy(&ds
->ds_lock
);
287 mutex_destroy(&ds
->ds_opening_lock
);
288 mutex_destroy(&ds
->ds_sendstream_lock
);
289 refcount_destroy(&ds
->ds_longholds
);
290 rrw_destroy(&ds
->ds_bp_rwlock
);
292 kmem_free(ds
, sizeof (dsl_dataset_t
));
296 dsl_dataset_get_snapname(dsl_dataset_t
*ds
)
298 dsl_dataset_phys_t
*headphys
;
301 dsl_pool_t
*dp
= ds
->ds_dir
->dd_pool
;
302 objset_t
*mos
= dp
->dp_meta_objset
;
304 if (ds
->ds_snapname
[0])
306 if (dsl_dataset_phys(ds
)->ds_next_snap_obj
== 0)
309 err
= dmu_bonus_hold(mos
, dsl_dir_phys(ds
->ds_dir
)->dd_head_dataset_obj
,
313 headphys
= headdbuf
->db_data
;
314 err
= zap_value_search(dp
->dp_meta_objset
,
315 headphys
->ds_snapnames_zapobj
, ds
->ds_object
, 0, ds
->ds_snapname
);
316 if (err
!= 0 && zfs_recover
== B_TRUE
) {
318 (void) snprintf(ds
->ds_snapname
, sizeof (ds
->ds_snapname
),
319 "SNAPOBJ=%llu-ERR=%d",
320 (unsigned long long)ds
->ds_object
, err
);
322 dmu_buf_rele(headdbuf
, FTAG
);
327 dsl_dataset_snap_lookup(dsl_dataset_t
*ds
, const char *name
, uint64_t *value
)
329 objset_t
*mos
= ds
->ds_dir
->dd_pool
->dp_meta_objset
;
330 uint64_t snapobj
= dsl_dataset_phys(ds
)->ds_snapnames_zapobj
;
334 if (dsl_dataset_phys(ds
)->ds_flags
& DS_FLAG_CI_DATASET
)
337 err
= zap_lookup_norm(mos
, snapobj
, name
, 8, 1,
338 value
, mt
, NULL
, 0, NULL
);
339 if (err
== ENOTSUP
&& (mt
& MT_NORMALIZE
))
340 err
= zap_lookup(mos
, snapobj
, name
, 8, 1, value
);
345 dsl_dataset_snap_remove(dsl_dataset_t
*ds
, const char *name
, dmu_tx_t
*tx
,
348 objset_t
*mos
= ds
->ds_dir
->dd_pool
->dp_meta_objset
;
349 uint64_t snapobj
= dsl_dataset_phys(ds
)->ds_snapnames_zapobj
;
353 dsl_dir_snap_cmtime_update(ds
->ds_dir
);
355 if (dsl_dataset_phys(ds
)->ds_flags
& DS_FLAG_CI_DATASET
)
358 err
= zap_remove_norm(mos
, snapobj
, name
, mt
, tx
);
359 if (err
== ENOTSUP
&& (mt
& MT_NORMALIZE
))
360 err
= zap_remove(mos
, snapobj
, name
, tx
);
362 if (err
== 0 && adj_cnt
)
363 dsl_fs_ss_count_adjust(ds
->ds_dir
, -1,
364 DD_FIELD_SNAPSHOT_COUNT
, tx
);
370 dsl_dataset_try_add_ref(dsl_pool_t
*dp
, dsl_dataset_t
*ds
, void *tag
)
372 dmu_buf_t
*dbuf
= ds
->ds_dbuf
;
373 boolean_t result
= B_FALSE
;
375 if (dbuf
!= NULL
&& dmu_buf_try_add_ref(dbuf
, dp
->dp_meta_objset
,
376 ds
->ds_object
, DMU_BONUS_BLKID
, tag
)) {
378 if (ds
== dmu_buf_get_user(dbuf
))
381 dmu_buf_rele(dbuf
, tag
);
388 dsl_dataset_hold_obj_flags(dsl_pool_t
*dp
, uint64_t dsobj
,
389 ds_hold_flags_t flags
, void *tag
, dsl_dataset_t
**dsp
)
391 objset_t
*mos
= dp
->dp_meta_objset
;
395 dmu_object_info_t doi
;
397 ASSERT(dsl_pool_config_held(dp
));
399 err
= dmu_bonus_hold(mos
, dsobj
, tag
, &dbuf
);
403 /* Make sure dsobj has the correct object type. */
404 dmu_object_info_from_db(dbuf
, &doi
);
405 if (doi
.doi_bonus_type
!= DMU_OT_DSL_DATASET
) {
406 dmu_buf_rele(dbuf
, tag
);
407 return (SET_ERROR(EINVAL
));
410 ds
= dmu_buf_get_user(dbuf
);
412 dsl_dataset_t
*winner
= NULL
;
414 ds
= kmem_zalloc(sizeof (dsl_dataset_t
), KM_SLEEP
);
416 ds
->ds_object
= dsobj
;
417 ds
->ds_is_snapshot
= dsl_dataset_phys(ds
)->ds_num_children
!= 0;
418 list_link_init(&ds
->ds_synced_link
);
420 mutex_init(&ds
->ds_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
421 mutex_init(&ds
->ds_opening_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
422 mutex_init(&ds
->ds_sendstream_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
423 rrw_init(&ds
->ds_bp_rwlock
, B_FALSE
);
424 refcount_create(&ds
->ds_longholds
);
426 bplist_create(&ds
->ds_pending_deadlist
);
427 dsl_deadlist_open(&ds
->ds_deadlist
,
428 mos
, dsl_dataset_phys(ds
)->ds_deadlist_obj
);
430 list_create(&ds
->ds_sendstreams
, sizeof (dmu_sendarg_t
),
431 offsetof(dmu_sendarg_t
, dsa_link
));
433 list_create(&ds
->ds_prop_cbs
, sizeof (dsl_prop_cb_record_t
),
434 offsetof(dsl_prop_cb_record_t
, cbr_ds_node
));
436 if (doi
.doi_type
== DMU_OTN_ZAP_METADATA
) {
439 for (f
= 0; f
< SPA_FEATURES
; f
++) {
440 if (!(spa_feature_table
[f
].fi_flags
&
441 ZFEATURE_FLAG_PER_DATASET
))
443 err
= zap_contains(mos
, dsobj
,
444 spa_feature_table
[f
].fi_guid
);
446 ds
->ds_feature_inuse
[f
] = B_TRUE
;
448 ASSERT3U(err
, ==, ENOENT
);
454 err
= dsl_dir_hold_obj(dp
,
455 dsl_dataset_phys(ds
)->ds_dir_obj
, NULL
, ds
, &ds
->ds_dir
);
457 mutex_destroy(&ds
->ds_lock
);
458 mutex_destroy(&ds
->ds_opening_lock
);
459 mutex_destroy(&ds
->ds_sendstream_lock
);
460 refcount_destroy(&ds
->ds_longholds
);
461 bplist_destroy(&ds
->ds_pending_deadlist
);
462 dsl_deadlist_close(&ds
->ds_deadlist
);
463 kmem_free(ds
, sizeof (dsl_dataset_t
));
464 dmu_buf_rele(dbuf
, tag
);
468 if (!ds
->ds_is_snapshot
) {
469 ds
->ds_snapname
[0] = '\0';
470 if (dsl_dataset_phys(ds
)->ds_prev_snap_obj
!= 0) {
471 err
= dsl_dataset_hold_obj(dp
,
472 dsl_dataset_phys(ds
)->ds_prev_snap_obj
,
475 if (doi
.doi_type
== DMU_OTN_ZAP_METADATA
) {
476 int zaperr
= zap_lookup(mos
, ds
->ds_object
,
477 DS_FIELD_BOOKMARK_NAMES
,
478 sizeof (ds
->ds_bookmarks
), 1,
480 if (zaperr
!= ENOENT
)
484 if (zfs_flags
& ZFS_DEBUG_SNAPNAMES
)
485 err
= dsl_dataset_get_snapname(ds
);
487 dsl_dataset_phys(ds
)->ds_userrefs_obj
!= 0) {
489 ds
->ds_dir
->dd_pool
->dp_meta_objset
,
490 dsl_dataset_phys(ds
)->ds_userrefs_obj
,
495 if (err
== 0 && !ds
->ds_is_snapshot
) {
496 err
= dsl_prop_get_int_ds(ds
,
497 zfs_prop_to_name(ZFS_PROP_REFRESERVATION
),
500 err
= dsl_prop_get_int_ds(ds
,
501 zfs_prop_to_name(ZFS_PROP_REFQUOTA
),
505 ds
->ds_reserved
= ds
->ds_quota
= 0;
508 dmu_buf_init_user(&ds
->ds_dbu
, dsl_dataset_evict_sync
,
509 dsl_dataset_evict_async
, &ds
->ds_dbuf
);
511 winner
= dmu_buf_set_user_ie(dbuf
, &ds
->ds_dbu
);
513 if (err
!= 0 || winner
!= NULL
) {
514 bplist_destroy(&ds
->ds_pending_deadlist
);
515 dsl_deadlist_close(&ds
->ds_deadlist
);
517 dsl_dataset_rele(ds
->ds_prev
, ds
);
518 dsl_dir_rele(ds
->ds_dir
, ds
);
519 mutex_destroy(&ds
->ds_lock
);
520 mutex_destroy(&ds
->ds_opening_lock
);
521 mutex_destroy(&ds
->ds_sendstream_lock
);
522 refcount_destroy(&ds
->ds_longholds
);
523 kmem_free(ds
, sizeof (dsl_dataset_t
));
525 dmu_buf_rele(dbuf
, tag
);
531 unique_insert(dsl_dataset_phys(ds
)->ds_fsid_guid
);
532 if (ds
->ds_fsid_guid
!=
533 dsl_dataset_phys(ds
)->ds_fsid_guid
) {
534 zfs_dbgmsg("ds_fsid_guid changed from "
535 "%llx to %llx for pool %s dataset id %llu",
537 dsl_dataset_phys(ds
)->ds_fsid_guid
,
538 (long long)ds
->ds_fsid_guid
,
539 spa_name(dp
->dp_spa
),
544 ASSERT3P(ds
->ds_dbuf
, ==, dbuf
);
545 ASSERT3P(dsl_dataset_phys(ds
), ==, dbuf
->db_data
);
546 ASSERT(dsl_dataset_phys(ds
)->ds_prev_snap_obj
!= 0 ||
547 spa_version(dp
->dp_spa
) < SPA_VERSION_ORIGIN
||
548 dp
->dp_origin_snap
== NULL
|| ds
== dp
->dp_origin_snap
);
551 if ((flags
& DS_HOLD_FLAG_DECRYPT
) && ds
->ds_dir
->dd_crypto_obj
!= 0) {
552 err
= spa_keystore_create_mapping(dp
->dp_spa
, ds
, ds
);
554 dsl_dataset_rele(ds
, tag
);
555 return (SET_ERROR(EACCES
));
563 dsl_dataset_hold_obj(dsl_pool_t
*dp
, uint64_t dsobj
, void *tag
,
566 return (dsl_dataset_hold_obj_flags(dp
, dsobj
, 0, tag
, dsp
));
570 dsl_dataset_hold_flags(dsl_pool_t
*dp
, const char *name
, ds_hold_flags_t flags
,
571 void *tag
, dsl_dataset_t
**dsp
)
574 const char *snapname
;
579 err
= dsl_dir_hold(dp
, name
, FTAG
, &dd
, &snapname
);
583 ASSERT(dsl_pool_config_held(dp
));
584 obj
= dsl_dir_phys(dd
)->dd_head_dataset_obj
;
586 err
= dsl_dataset_hold_obj_flags(dp
, obj
, flags
, tag
, &ds
);
588 err
= SET_ERROR(ENOENT
);
590 /* we may be looking for a snapshot */
591 if (err
== 0 && snapname
!= NULL
) {
592 dsl_dataset_t
*snap_ds
;
594 if (*snapname
++ != '@') {
595 dsl_dataset_rele_flags(ds
, flags
, tag
);
596 dsl_dir_rele(dd
, FTAG
);
597 return (SET_ERROR(ENOENT
));
600 dprintf("looking for snapshot '%s'\n", snapname
);
601 err
= dsl_dataset_snap_lookup(ds
, snapname
, &obj
);
603 err
= dsl_dataset_hold_obj_flags(dp
, obj
, flags
, tag
,
606 dsl_dataset_rele_flags(ds
, flags
, tag
);
609 mutex_enter(&snap_ds
->ds_lock
);
610 if (snap_ds
->ds_snapname
[0] == 0)
611 (void) strlcpy(snap_ds
->ds_snapname
, snapname
,
612 sizeof (snap_ds
->ds_snapname
));
613 mutex_exit(&snap_ds
->ds_lock
);
619 dsl_dir_rele(dd
, FTAG
);
624 dsl_dataset_hold(dsl_pool_t
*dp
, const char *name
, void *tag
,
627 return (dsl_dataset_hold_flags(dp
, name
, 0, tag
, dsp
));
631 dsl_dataset_own_obj(dsl_pool_t
*dp
, uint64_t dsobj
, ds_hold_flags_t flags
,
632 void *tag
, dsl_dataset_t
**dsp
)
634 int err
= dsl_dataset_hold_obj_flags(dp
, dsobj
, flags
, tag
, dsp
);
637 if (!dsl_dataset_tryown(*dsp
, tag
)) {
638 dsl_dataset_rele_flags(*dsp
, flags
, tag
);
640 return (SET_ERROR(EBUSY
));
646 dsl_dataset_own(dsl_pool_t
*dp
, const char *name
, ds_hold_flags_t flags
,
647 void *tag
, dsl_dataset_t
**dsp
)
649 int err
= dsl_dataset_hold_flags(dp
, name
, flags
, tag
, dsp
);
652 if (!dsl_dataset_tryown(*dsp
, tag
)) {
653 dsl_dataset_rele_flags(*dsp
, flags
, tag
);
654 return (SET_ERROR(EBUSY
));
660 * See the comment above dsl_pool_hold() for details. In summary, a long
661 * hold is used to prevent destruction of a dataset while the pool hold
662 * is dropped, allowing other concurrent operations (e.g. spa_sync()).
664 * The dataset and pool must be held when this function is called. After it
665 * is called, the pool hold may be released while the dataset is still held
669 dsl_dataset_long_hold(dsl_dataset_t
*ds
, void *tag
)
671 ASSERT(dsl_pool_config_held(ds
->ds_dir
->dd_pool
));
672 (void) refcount_add(&ds
->ds_longholds
, tag
);
676 dsl_dataset_long_rele(dsl_dataset_t
*ds
, void *tag
)
678 (void) refcount_remove(&ds
->ds_longholds
, tag
);
681 /* Return B_TRUE if there are any long holds on this dataset. */
683 dsl_dataset_long_held(dsl_dataset_t
*ds
)
685 return (!refcount_is_zero(&ds
->ds_longholds
));
689 dsl_dataset_name(dsl_dataset_t
*ds
, char *name
)
692 (void) strcpy(name
, "mos");
694 dsl_dir_name(ds
->ds_dir
, name
);
695 VERIFY0(dsl_dataset_get_snapname(ds
));
696 if (ds
->ds_snapname
[0]) {
697 VERIFY3U(strlcat(name
, "@", ZFS_MAX_DATASET_NAME_LEN
),
698 <, ZFS_MAX_DATASET_NAME_LEN
);
700 * We use a "recursive" mutex so that we
701 * can call dprintf_ds() with ds_lock held.
703 if (!MUTEX_HELD(&ds
->ds_lock
)) {
704 mutex_enter(&ds
->ds_lock
);
705 VERIFY3U(strlcat(name
, ds
->ds_snapname
,
706 ZFS_MAX_DATASET_NAME_LEN
), <,
707 ZFS_MAX_DATASET_NAME_LEN
);
708 mutex_exit(&ds
->ds_lock
);
710 VERIFY3U(strlcat(name
, ds
->ds_snapname
,
711 ZFS_MAX_DATASET_NAME_LEN
), <,
712 ZFS_MAX_DATASET_NAME_LEN
);
719 dsl_dataset_namelen(dsl_dataset_t
*ds
)
721 VERIFY0(dsl_dataset_get_snapname(ds
));
722 mutex_enter(&ds
->ds_lock
);
723 int len
= strlen(ds
->ds_snapname
);
724 /* add '@' if ds is a snap */
727 len
+= dsl_dir_namelen(ds
->ds_dir
);
728 mutex_exit(&ds
->ds_lock
);
733 dsl_dataset_rele_flags(dsl_dataset_t
*ds
, ds_hold_flags_t flags
, void *tag
)
735 if (ds
->ds_dir
!= NULL
&& ds
->ds_dir
->dd_crypto_obj
!= 0 &&
736 (flags
& DS_HOLD_FLAG_DECRYPT
)) {
737 (void) spa_keystore_remove_mapping(ds
->ds_dir
->dd_pool
->dp_spa
,
741 dmu_buf_rele(ds
->ds_dbuf
, tag
);
745 dsl_dataset_rele(dsl_dataset_t
*ds
, void *tag
)
747 dsl_dataset_rele_flags(ds
, 0, tag
);
751 dsl_dataset_disown(dsl_dataset_t
*ds
, ds_hold_flags_t flags
, void *tag
)
753 ASSERT3P(ds
->ds_owner
, ==, tag
);
754 ASSERT(ds
->ds_dbuf
!= NULL
);
756 mutex_enter(&ds
->ds_lock
);
758 mutex_exit(&ds
->ds_lock
);
759 dsl_dataset_long_rele(ds
, tag
);
760 dsl_dataset_rele_flags(ds
, flags
, tag
);
764 dsl_dataset_tryown(dsl_dataset_t
*ds
, void *tag
)
766 boolean_t gotit
= FALSE
;
768 ASSERT(dsl_pool_config_held(ds
->ds_dir
->dd_pool
));
769 mutex_enter(&ds
->ds_lock
);
770 if (ds
->ds_owner
== NULL
&& !DS_IS_INCONSISTENT(ds
)) {
772 dsl_dataset_long_hold(ds
, tag
);
775 mutex_exit(&ds
->ds_lock
);
780 dsl_dataset_has_owner(dsl_dataset_t
*ds
)
783 mutex_enter(&ds
->ds_lock
);
784 rv
= (ds
->ds_owner
!= NULL
);
785 mutex_exit(&ds
->ds_lock
);
790 dsl_dataset_activate_feature(uint64_t dsobj
, spa_feature_t f
, dmu_tx_t
*tx
)
792 spa_t
*spa
= dmu_tx_pool(tx
)->dp_spa
;
793 objset_t
*mos
= dmu_tx_pool(tx
)->dp_meta_objset
;
796 VERIFY(spa_feature_table
[f
].fi_flags
& ZFEATURE_FLAG_PER_DATASET
);
798 spa_feature_incr(spa
, f
, tx
);
799 dmu_object_zapify(mos
, dsobj
, DMU_OT_DSL_DATASET
, tx
);
801 VERIFY0(zap_add(mos
, dsobj
, spa_feature_table
[f
].fi_guid
,
802 sizeof (zero
), 1, &zero
, tx
));
806 dsl_dataset_deactivate_feature(uint64_t dsobj
, spa_feature_t f
, dmu_tx_t
*tx
)
808 spa_t
*spa
= dmu_tx_pool(tx
)->dp_spa
;
809 objset_t
*mos
= dmu_tx_pool(tx
)->dp_meta_objset
;
811 VERIFY(spa_feature_table
[f
].fi_flags
& ZFEATURE_FLAG_PER_DATASET
);
813 VERIFY0(zap_remove(mos
, dsobj
, spa_feature_table
[f
].fi_guid
, tx
));
814 spa_feature_decr(spa
, f
, tx
);
818 dsl_dataset_create_sync_dd(dsl_dir_t
*dd
, dsl_dataset_t
*origin
,
819 dsl_crypto_params_t
*dcp
, uint64_t flags
, dmu_tx_t
*tx
)
821 dsl_pool_t
*dp
= dd
->dd_pool
;
823 dsl_dataset_phys_t
*dsphys
;
825 objset_t
*mos
= dp
->dp_meta_objset
;
828 origin
= dp
->dp_origin_snap
;
830 ASSERT(origin
== NULL
|| origin
->ds_dir
->dd_pool
== dp
);
831 ASSERT(origin
== NULL
|| dsl_dataset_phys(origin
)->ds_num_children
> 0);
832 ASSERT(dmu_tx_is_syncing(tx
));
833 ASSERT(dsl_dir_phys(dd
)->dd_head_dataset_obj
== 0);
835 dsobj
= dmu_object_alloc(mos
, DMU_OT_DSL_DATASET
, 0,
836 DMU_OT_DSL_DATASET
, sizeof (dsl_dataset_phys_t
), tx
);
837 VERIFY0(dmu_bonus_hold(mos
, dsobj
, FTAG
, &dbuf
));
838 dmu_buf_will_dirty(dbuf
, tx
);
839 dsphys
= dbuf
->db_data
;
840 bzero(dsphys
, sizeof (dsl_dataset_phys_t
));
841 dsphys
->ds_dir_obj
= dd
->dd_object
;
842 dsphys
->ds_flags
= flags
;
843 dsphys
->ds_fsid_guid
= unique_create();
844 (void) random_get_pseudo_bytes((void*)&dsphys
->ds_guid
,
845 sizeof (dsphys
->ds_guid
));
846 dsphys
->ds_snapnames_zapobj
=
847 zap_create_norm(mos
, U8_TEXTPREP_TOUPPER
, DMU_OT_DSL_DS_SNAP_MAP
,
849 dsphys
->ds_creation_time
= gethrestime_sec();
850 dsphys
->ds_creation_txg
= tx
->tx_txg
== TXG_INITIAL
? 1 : tx
->tx_txg
;
852 if (origin
== NULL
) {
853 dsphys
->ds_deadlist_obj
= dsl_deadlist_alloc(mos
, tx
);
855 dsl_dataset_t
*ohds
; /* head of the origin snapshot */
857 dsphys
->ds_prev_snap_obj
= origin
->ds_object
;
858 dsphys
->ds_prev_snap_txg
=
859 dsl_dataset_phys(origin
)->ds_creation_txg
;
860 dsphys
->ds_referenced_bytes
=
861 dsl_dataset_phys(origin
)->ds_referenced_bytes
;
862 dsphys
->ds_compressed_bytes
=
863 dsl_dataset_phys(origin
)->ds_compressed_bytes
;
864 dsphys
->ds_uncompressed_bytes
=
865 dsl_dataset_phys(origin
)->ds_uncompressed_bytes
;
866 rrw_enter(&origin
->ds_bp_rwlock
, RW_READER
, FTAG
);
867 dsphys
->ds_bp
= dsl_dataset_phys(origin
)->ds_bp
;
868 rrw_exit(&origin
->ds_bp_rwlock
, FTAG
);
871 * Inherit flags that describe the dataset's contents
872 * (INCONSISTENT) or properties (Case Insensitive).
874 dsphys
->ds_flags
|= dsl_dataset_phys(origin
)->ds_flags
&
875 (DS_FLAG_INCONSISTENT
| DS_FLAG_CI_DATASET
);
877 for (spa_feature_t f
= 0; f
< SPA_FEATURES
; f
++) {
878 if (origin
->ds_feature_inuse
[f
])
879 dsl_dataset_activate_feature(dsobj
, f
, tx
);
882 dmu_buf_will_dirty(origin
->ds_dbuf
, tx
);
883 dsl_dataset_phys(origin
)->ds_num_children
++;
885 VERIFY0(dsl_dataset_hold_obj(dp
,
886 dsl_dir_phys(origin
->ds_dir
)->dd_head_dataset_obj
,
888 dsphys
->ds_deadlist_obj
= dsl_deadlist_clone(&ohds
->ds_deadlist
,
889 dsphys
->ds_prev_snap_txg
, dsphys
->ds_prev_snap_obj
, tx
);
890 dsl_dataset_rele(ohds
, FTAG
);
892 if (spa_version(dp
->dp_spa
) >= SPA_VERSION_NEXT_CLONES
) {
893 if (dsl_dataset_phys(origin
)->ds_next_clones_obj
== 0) {
894 dsl_dataset_phys(origin
)->ds_next_clones_obj
=
896 DMU_OT_NEXT_CLONES
, DMU_OT_NONE
, 0, tx
);
898 VERIFY0(zap_add_int(mos
,
899 dsl_dataset_phys(origin
)->ds_next_clones_obj
,
903 dmu_buf_will_dirty(dd
->dd_dbuf
, tx
);
904 dsl_dir_phys(dd
)->dd_origin_obj
= origin
->ds_object
;
905 if (spa_version(dp
->dp_spa
) >= SPA_VERSION_DIR_CLONES
) {
906 if (dsl_dir_phys(origin
->ds_dir
)->dd_clones
== 0) {
907 dmu_buf_will_dirty(origin
->ds_dir
->dd_dbuf
, tx
);
908 dsl_dir_phys(origin
->ds_dir
)->dd_clones
=
910 DMU_OT_DSL_CLONES
, DMU_OT_NONE
, 0, tx
);
912 VERIFY0(zap_add_int(mos
,
913 dsl_dir_phys(origin
->ds_dir
)->dd_clones
,
918 /* handle encryption */
919 dsl_dataset_create_crypt_sync(dsobj
, dd
, origin
, dcp
, tx
);
921 if (spa_version(dp
->dp_spa
) >= SPA_VERSION_UNIQUE_ACCURATE
)
922 dsphys
->ds_flags
|= DS_FLAG_UNIQUE_ACCURATE
;
924 dmu_buf_rele(dbuf
, FTAG
);
926 dmu_buf_will_dirty(dd
->dd_dbuf
, tx
);
927 dsl_dir_phys(dd
)->dd_head_dataset_obj
= dsobj
;
933 dsl_dataset_zero_zil(dsl_dataset_t
*ds
, dmu_tx_t
*tx
)
937 VERIFY0(dmu_objset_from_ds(ds
, &os
));
938 if (bcmp(&os
->os_zil_header
, &zero_zil
, sizeof (zero_zil
)) != 0) {
939 dsl_pool_t
*dp
= ds
->ds_dir
->dd_pool
;
942 bzero(&os
->os_zil_header
, sizeof (os
->os_zil_header
));
943 if (os
->os_encrypted
)
944 os
->os_next_write_raw
[tx
->tx_txg
& TXG_MASK
] = B_TRUE
;
946 zio
= zio_root(dp
->dp_spa
, NULL
, NULL
, ZIO_FLAG_MUSTSUCCEED
);
947 dsl_dataset_sync(ds
, zio
, tx
);
948 VERIFY0(zio_wait(zio
));
950 /* dsl_dataset_sync_done will drop this reference. */
951 dmu_buf_add_ref(ds
->ds_dbuf
, ds
);
952 dsl_dataset_sync_done(ds
, tx
);
957 dsl_dataset_create_sync(dsl_dir_t
*pdd
, const char *lastname
,
958 dsl_dataset_t
*origin
, uint64_t flags
, cred_t
*cr
,
959 dsl_crypto_params_t
*dcp
, dmu_tx_t
*tx
)
961 dsl_pool_t
*dp
= pdd
->dd_pool
;
962 uint64_t dsobj
, ddobj
;
965 ASSERT(dmu_tx_is_syncing(tx
));
966 ASSERT(lastname
[0] != '@');
968 ddobj
= dsl_dir_create_sync(dp
, pdd
, lastname
, tx
);
969 VERIFY0(dsl_dir_hold_obj(dp
, ddobj
, lastname
, FTAG
, &dd
));
971 dsobj
= dsl_dataset_create_sync_dd(dd
, origin
, dcp
,
972 flags
& ~DS_CREATE_FLAG_NODIRTY
, tx
);
974 dsl_deleg_set_create_perms(dd
, tx
, cr
);
977 * Since we're creating a new node we know it's a leaf, so we can
978 * initialize the counts if the limit feature is active.
980 if (spa_feature_is_active(dp
->dp_spa
, SPA_FEATURE_FS_SS_LIMIT
)) {
982 objset_t
*os
= dd
->dd_pool
->dp_meta_objset
;
984 dsl_dir_zapify(dd
, tx
);
985 VERIFY0(zap_add(os
, dd
->dd_object
, DD_FIELD_FILESYSTEM_COUNT
,
986 sizeof (cnt
), 1, &cnt
, tx
));
987 VERIFY0(zap_add(os
, dd
->dd_object
, DD_FIELD_SNAPSHOT_COUNT
,
988 sizeof (cnt
), 1, &cnt
, tx
));
991 dsl_dir_rele(dd
, FTAG
);
994 * If we are creating a clone, make sure we zero out any stale
995 * data from the origin snapshots zil header.
997 if (origin
!= NULL
&& !(flags
& DS_CREATE_FLAG_NODIRTY
)) {
1000 VERIFY0(dsl_dataset_hold_obj(dp
, dsobj
, FTAG
, &ds
));
1001 dsl_dataset_zero_zil(ds
, tx
);
1002 dsl_dataset_rele(ds
, FTAG
);
1009 * The unique space in the head dataset can be calculated by subtracting
1010 * the space used in the most recent snapshot, that is still being used
1011 * in this file system, from the space currently in use. To figure out
1012 * the space in the most recent snapshot still in use, we need to take
1013 * the total space used in the snapshot and subtract out the space that
1014 * has been freed up since the snapshot was taken.
1017 dsl_dataset_recalc_head_uniq(dsl_dataset_t
*ds
)
1020 uint64_t dlused
, dlcomp
, dluncomp
;
1022 ASSERT(!ds
->ds_is_snapshot
);
1024 if (dsl_dataset_phys(ds
)->ds_prev_snap_obj
!= 0)
1025 mrs_used
= dsl_dataset_phys(ds
->ds_prev
)->ds_referenced_bytes
;
1029 dsl_deadlist_space(&ds
->ds_deadlist
, &dlused
, &dlcomp
, &dluncomp
);
1031 ASSERT3U(dlused
, <=, mrs_used
);
1032 dsl_dataset_phys(ds
)->ds_unique_bytes
=
1033 dsl_dataset_phys(ds
)->ds_referenced_bytes
- (mrs_used
- dlused
);
1035 if (spa_version(ds
->ds_dir
->dd_pool
->dp_spa
) >=
1036 SPA_VERSION_UNIQUE_ACCURATE
)
1037 dsl_dataset_phys(ds
)->ds_flags
|= DS_FLAG_UNIQUE_ACCURATE
;
1041 dsl_dataset_remove_from_next_clones(dsl_dataset_t
*ds
, uint64_t obj
,
1044 objset_t
*mos
= ds
->ds_dir
->dd_pool
->dp_meta_objset
;
1045 ASSERTV(uint64_t count
);
1048 ASSERT(dsl_dataset_phys(ds
)->ds_num_children
>= 2);
1049 err
= zap_remove_int(mos
, dsl_dataset_phys(ds
)->ds_next_clones_obj
,
1052 * The err should not be ENOENT, but a bug in a previous version
1053 * of the code could cause upgrade_clones_cb() to not set
1054 * ds_next_snap_obj when it should, leading to a missing entry.
1055 * If we knew that the pool was created after
1056 * SPA_VERSION_NEXT_CLONES, we could assert that it isn't
1057 * ENOENT. However, at least we can check that we don't have
1058 * too many entries in the next_clones_obj even after failing to
1063 ASSERT0(zap_count(mos
, dsl_dataset_phys(ds
)->ds_next_clones_obj
,
1065 ASSERT3U(count
, <=, dsl_dataset_phys(ds
)->ds_num_children
- 2);
1070 dsl_dataset_get_blkptr(dsl_dataset_t
*ds
)
1072 return (&dsl_dataset_phys(ds
)->ds_bp
);
1076 dsl_dataset_get_spa(dsl_dataset_t
*ds
)
1078 return (ds
->ds_dir
->dd_pool
->dp_spa
);
1082 dsl_dataset_dirty(dsl_dataset_t
*ds
, dmu_tx_t
*tx
)
1086 if (ds
== NULL
) /* this is the meta-objset */
1089 ASSERT(ds
->ds_objset
!= NULL
);
1091 if (dsl_dataset_phys(ds
)->ds_next_snap_obj
!= 0)
1092 panic("dirtying snapshot!");
1094 /* Must not dirty a dataset in the same txg where it got snapshotted. */
1095 ASSERT3U(tx
->tx_txg
, >, dsl_dataset_phys(ds
)->ds_prev_snap_txg
);
1097 dp
= ds
->ds_dir
->dd_pool
;
1098 if (txg_list_add(&dp
->dp_dirty_datasets
, ds
, tx
->tx_txg
)) {
1099 /* up the hold count until we can be written out */
1100 dmu_buf_add_ref(ds
->ds_dbuf
, ds
);
1105 dsl_dataset_is_dirty(dsl_dataset_t
*ds
)
1107 for (int t
= 0; t
< TXG_SIZE
; t
++) {
1108 if (txg_list_member(&ds
->ds_dir
->dd_pool
->dp_dirty_datasets
,
1116 dsl_dataset_snapshot_reserve_space(dsl_dataset_t
*ds
, dmu_tx_t
*tx
)
1120 if (!dmu_tx_is_syncing(tx
))
1124 * If there's an fs-only reservation, any blocks that might become
1125 * owned by the snapshot dataset must be accommodated by space
1126 * outside of the reservation.
1128 ASSERT(ds
->ds_reserved
== 0 || DS_UNIQUE_IS_ACCURATE(ds
));
1129 asize
= MIN(dsl_dataset_phys(ds
)->ds_unique_bytes
, ds
->ds_reserved
);
1130 if (asize
> dsl_dir_space_available(ds
->ds_dir
, NULL
, 0, TRUE
))
1131 return (SET_ERROR(ENOSPC
));
1134 * Propagate any reserved space for this snapshot to other
1135 * snapshot checks in this sync group.
1138 dsl_dir_willuse_space(ds
->ds_dir
, asize
, tx
);
1143 typedef struct dsl_dataset_snapshot_arg
{
1144 nvlist_t
*ddsa_snaps
;
1145 nvlist_t
*ddsa_props
;
1146 nvlist_t
*ddsa_errors
;
1148 } dsl_dataset_snapshot_arg_t
;
1151 dsl_dataset_snapshot_check_impl(dsl_dataset_t
*ds
, const char *snapname
,
1152 dmu_tx_t
*tx
, boolean_t recv
, uint64_t cnt
, cred_t
*cr
)
1157 ds
->ds_trysnap_txg
= tx
->tx_txg
;
1159 if (!dmu_tx_is_syncing(tx
))
1163 * We don't allow multiple snapshots of the same txg. If there
1164 * is already one, try again.
1166 if (dsl_dataset_phys(ds
)->ds_prev_snap_txg
>= tx
->tx_txg
)
1167 return (SET_ERROR(EAGAIN
));
1170 * Check for conflicting snapshot name.
1172 error
= dsl_dataset_snap_lookup(ds
, snapname
, &value
);
1174 return (SET_ERROR(EEXIST
));
1175 if (error
!= ENOENT
)
1179 * We don't allow taking snapshots of inconsistent datasets, such as
1180 * those into which we are currently receiving. However, if we are
1181 * creating this snapshot as part of a receive, this check will be
1182 * executed atomically with respect to the completion of the receive
1183 * itself but prior to the clearing of DS_FLAG_INCONSISTENT; in this
1184 * case we ignore this, knowing it will be fixed up for us shortly in
1185 * dmu_recv_end_sync().
1187 if (!recv
&& DS_IS_INCONSISTENT(ds
))
1188 return (SET_ERROR(EBUSY
));
1191 * Skip the check for temporary snapshots or if we have already checked
1192 * the counts in dsl_dataset_snapshot_check. This means we really only
1193 * check the count here when we're receiving a stream.
1195 if (cnt
!= 0 && cr
!= NULL
) {
1196 error
= dsl_fs_ss_limit_check(ds
->ds_dir
, cnt
,
1197 ZFS_PROP_SNAPSHOT_LIMIT
, NULL
, cr
);
1202 error
= dsl_dataset_snapshot_reserve_space(ds
, tx
);
1210 dsl_dataset_snapshot_check(void *arg
, dmu_tx_t
*tx
)
1212 dsl_dataset_snapshot_arg_t
*ddsa
= arg
;
1213 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
1218 * Pre-compute how many total new snapshots will be created for each
1219 * level in the tree and below. This is needed for validating the
1220 * snapshot limit when either taking a recursive snapshot or when
1221 * taking multiple snapshots.
1223 * The problem is that the counts are not actually adjusted when
1224 * we are checking, only when we finally sync. For a single snapshot,
1225 * this is easy, the count will increase by 1 at each node up the tree,
1226 * but its more complicated for the recursive/multiple snapshot case.
1228 * The dsl_fs_ss_limit_check function does recursively check the count
1229 * at each level up the tree but since it is validating each snapshot
1230 * independently we need to be sure that we are validating the complete
1231 * count for the entire set of snapshots. We do this by rolling up the
1232 * counts for each component of the name into an nvlist and then
1233 * checking each of those cases with the aggregated count.
1235 * This approach properly handles not only the recursive snapshot
1236 * case (where we get all of those on the ddsa_snaps list) but also
1237 * the sibling case (e.g. snapshot a/b and a/c so that we will also
1238 * validate the limit on 'a' using a count of 2).
1240 * We validate the snapshot names in the third loop and only report
1243 if (dmu_tx_is_syncing(tx
)) {
1245 nvlist_t
*cnt_track
= NULL
;
1246 cnt_track
= fnvlist_alloc();
1248 nm
= kmem_alloc(MAXPATHLEN
, KM_SLEEP
);
1250 /* Rollup aggregated counts into the cnt_track list */
1251 for (pair
= nvlist_next_nvpair(ddsa
->ddsa_snaps
, NULL
);
1253 pair
= nvlist_next_nvpair(ddsa
->ddsa_snaps
, pair
)) {
1257 (void) strlcpy(nm
, nvpair_name(pair
), MAXPATHLEN
);
1258 pdelim
= strchr(nm
, '@');
1264 if (nvlist_lookup_uint64(cnt_track
, nm
,
1266 /* update existing entry */
1267 fnvlist_add_uint64(cnt_track
, nm
,
1271 fnvlist_add_uint64(cnt_track
, nm
, 1);
1274 pdelim
= strrchr(nm
, '/');
1277 } while (pdelim
!= NULL
);
1280 kmem_free(nm
, MAXPATHLEN
);
1282 /* Check aggregated counts at each level */
1283 for (pair
= nvlist_next_nvpair(cnt_track
, NULL
);
1284 pair
!= NULL
; pair
= nvlist_next_nvpair(cnt_track
, pair
)) {
1290 name
= nvpair_name(pair
);
1291 cnt
= fnvpair_value_uint64(pair
);
1294 error
= dsl_dataset_hold(dp
, name
, FTAG
, &ds
);
1296 error
= dsl_fs_ss_limit_check(ds
->ds_dir
, cnt
,
1297 ZFS_PROP_SNAPSHOT_LIMIT
, NULL
,
1299 dsl_dataset_rele(ds
, FTAG
);
1303 if (ddsa
->ddsa_errors
!= NULL
)
1304 fnvlist_add_int32(ddsa
->ddsa_errors
,
1307 /* only report one error for this check */
1311 nvlist_free(cnt_track
);
1314 for (pair
= nvlist_next_nvpair(ddsa
->ddsa_snaps
, NULL
);
1315 pair
!= NULL
; pair
= nvlist_next_nvpair(ddsa
->ddsa_snaps
, pair
)) {
1318 char *name
, *atp
= NULL
;
1319 char dsname
[ZFS_MAX_DATASET_NAME_LEN
];
1321 name
= nvpair_name(pair
);
1322 if (strlen(name
) >= ZFS_MAX_DATASET_NAME_LEN
)
1323 error
= SET_ERROR(ENAMETOOLONG
);
1325 atp
= strchr(name
, '@');
1327 error
= SET_ERROR(EINVAL
);
1329 (void) strlcpy(dsname
, name
, atp
- name
+ 1);
1332 error
= dsl_dataset_hold(dp
, dsname
, FTAG
, &ds
);
1334 /* passing 0/NULL skips dsl_fs_ss_limit_check */
1335 error
= dsl_dataset_snapshot_check_impl(ds
,
1336 atp
+ 1, tx
, B_FALSE
, 0, NULL
);
1337 dsl_dataset_rele(ds
, FTAG
);
1341 if (ddsa
->ddsa_errors
!= NULL
) {
1342 fnvlist_add_int32(ddsa
->ddsa_errors
,
1353 dsl_dataset_snapshot_sync_impl(dsl_dataset_t
*ds
, const char *snapname
,
1356 dsl_pool_t
*dp
= ds
->ds_dir
->dd_pool
;
1358 dsl_dataset_phys_t
*dsphys
;
1359 uint64_t dsobj
, crtxg
;
1360 objset_t
*mos
= dp
->dp_meta_objset
;
1361 ASSERTV(static zil_header_t zero_zil
);
1362 ASSERTV(objset_t
*os
);
1364 ASSERT(RRW_WRITE_HELD(&dp
->dp_config_rwlock
));
1367 * If we are on an old pool, the zil must not be active, in which
1368 * case it will be zeroed. Usually zil_suspend() accomplishes this.
1370 ASSERT(spa_version(dmu_tx_pool(tx
)->dp_spa
) >= SPA_VERSION_FAST_SNAP
||
1371 dmu_objset_from_ds(ds
, &os
) != 0 ||
1372 bcmp(&os
->os_phys
->os_zil_header
, &zero_zil
,
1373 sizeof (zero_zil
)) == 0);
1375 /* Should not snapshot a dirty dataset. */
1376 ASSERT(!txg_list_member(&ds
->ds_dir
->dd_pool
->dp_dirty_datasets
,
1379 dsl_fs_ss_count_adjust(ds
->ds_dir
, 1, DD_FIELD_SNAPSHOT_COUNT
, tx
);
1382 * The origin's ds_creation_txg has to be < TXG_INITIAL
1384 if (strcmp(snapname
, ORIGIN_DIR_NAME
) == 0)
1389 dsobj
= dmu_object_alloc(mos
, DMU_OT_DSL_DATASET
, 0,
1390 DMU_OT_DSL_DATASET
, sizeof (dsl_dataset_phys_t
), tx
);
1391 VERIFY0(dmu_bonus_hold(mos
, dsobj
, FTAG
, &dbuf
));
1392 dmu_buf_will_dirty(dbuf
, tx
);
1393 dsphys
= dbuf
->db_data
;
1394 bzero(dsphys
, sizeof (dsl_dataset_phys_t
));
1395 dsphys
->ds_dir_obj
= ds
->ds_dir
->dd_object
;
1396 dsphys
->ds_fsid_guid
= unique_create();
1397 (void) random_get_pseudo_bytes((void*)&dsphys
->ds_guid
,
1398 sizeof (dsphys
->ds_guid
));
1399 dsphys
->ds_prev_snap_obj
= dsl_dataset_phys(ds
)->ds_prev_snap_obj
;
1400 dsphys
->ds_prev_snap_txg
= dsl_dataset_phys(ds
)->ds_prev_snap_txg
;
1401 dsphys
->ds_next_snap_obj
= ds
->ds_object
;
1402 dsphys
->ds_num_children
= 1;
1403 dsphys
->ds_creation_time
= gethrestime_sec();
1404 dsphys
->ds_creation_txg
= crtxg
;
1405 dsphys
->ds_deadlist_obj
= dsl_dataset_phys(ds
)->ds_deadlist_obj
;
1406 dsphys
->ds_referenced_bytes
= dsl_dataset_phys(ds
)->ds_referenced_bytes
;
1407 dsphys
->ds_compressed_bytes
= dsl_dataset_phys(ds
)->ds_compressed_bytes
;
1408 dsphys
->ds_uncompressed_bytes
=
1409 dsl_dataset_phys(ds
)->ds_uncompressed_bytes
;
1410 dsphys
->ds_flags
= dsl_dataset_phys(ds
)->ds_flags
;
1411 rrw_enter(&ds
->ds_bp_rwlock
, RW_READER
, FTAG
);
1412 dsphys
->ds_bp
= dsl_dataset_phys(ds
)->ds_bp
;
1413 rrw_exit(&ds
->ds_bp_rwlock
, FTAG
);
1414 dmu_buf_rele(dbuf
, FTAG
);
1416 for (spa_feature_t f
= 0; f
< SPA_FEATURES
; f
++) {
1417 if (ds
->ds_feature_inuse
[f
])
1418 dsl_dataset_activate_feature(dsobj
, f
, tx
);
1421 ASSERT3U(ds
->ds_prev
!= 0, ==,
1422 dsl_dataset_phys(ds
)->ds_prev_snap_obj
!= 0);
1424 uint64_t next_clones_obj
=
1425 dsl_dataset_phys(ds
->ds_prev
)->ds_next_clones_obj
;
1426 ASSERT(dsl_dataset_phys(ds
->ds_prev
)->ds_next_snap_obj
==
1428 dsl_dataset_phys(ds
->ds_prev
)->ds_num_children
> 1);
1429 if (dsl_dataset_phys(ds
->ds_prev
)->ds_next_snap_obj
==
1431 dmu_buf_will_dirty(ds
->ds_prev
->ds_dbuf
, tx
);
1432 ASSERT3U(dsl_dataset_phys(ds
)->ds_prev_snap_txg
, ==,
1433 dsl_dataset_phys(ds
->ds_prev
)->ds_creation_txg
);
1434 dsl_dataset_phys(ds
->ds_prev
)->ds_next_snap_obj
= dsobj
;
1435 } else if (next_clones_obj
!= 0) {
1436 dsl_dataset_remove_from_next_clones(ds
->ds_prev
,
1437 dsphys
->ds_next_snap_obj
, tx
);
1438 VERIFY0(zap_add_int(mos
,
1439 next_clones_obj
, dsobj
, tx
));
1444 * If we have a reference-reservation on this dataset, we will
1445 * need to increase the amount of refreservation being charged
1446 * since our unique space is going to zero.
1448 if (ds
->ds_reserved
) {
1450 ASSERT(DS_UNIQUE_IS_ACCURATE(ds
));
1451 delta
= MIN(dsl_dataset_phys(ds
)->ds_unique_bytes
,
1453 dsl_dir_diduse_space(ds
->ds_dir
, DD_USED_REFRSRV
,
1457 dmu_buf_will_dirty(ds
->ds_dbuf
, tx
);
1458 dsl_dataset_phys(ds
)->ds_deadlist_obj
=
1459 dsl_deadlist_clone(&ds
->ds_deadlist
, UINT64_MAX
,
1460 dsl_dataset_phys(ds
)->ds_prev_snap_obj
, tx
);
1461 dsl_deadlist_close(&ds
->ds_deadlist
);
1462 dsl_deadlist_open(&ds
->ds_deadlist
, mos
,
1463 dsl_dataset_phys(ds
)->ds_deadlist_obj
);
1464 dsl_deadlist_add_key(&ds
->ds_deadlist
,
1465 dsl_dataset_phys(ds
)->ds_prev_snap_txg
, tx
);
1467 ASSERT3U(dsl_dataset_phys(ds
)->ds_prev_snap_txg
, <, tx
->tx_txg
);
1468 dsl_dataset_phys(ds
)->ds_prev_snap_obj
= dsobj
;
1469 dsl_dataset_phys(ds
)->ds_prev_snap_txg
= crtxg
;
1470 dsl_dataset_phys(ds
)->ds_unique_bytes
= 0;
1471 if (spa_version(dp
->dp_spa
) >= SPA_VERSION_UNIQUE_ACCURATE
)
1472 dsl_dataset_phys(ds
)->ds_flags
|= DS_FLAG_UNIQUE_ACCURATE
;
1474 VERIFY0(zap_add(mos
, dsl_dataset_phys(ds
)->ds_snapnames_zapobj
,
1475 snapname
, 8, 1, &dsobj
, tx
));
1478 dsl_dataset_rele(ds
->ds_prev
, ds
);
1479 VERIFY0(dsl_dataset_hold_obj(dp
,
1480 dsl_dataset_phys(ds
)->ds_prev_snap_obj
, ds
, &ds
->ds_prev
));
1482 dsl_scan_ds_snapshotted(ds
, tx
);
1484 dsl_dir_snap_cmtime_update(ds
->ds_dir
);
1486 spa_history_log_internal_ds(ds
->ds_prev
, "snapshot", tx
, "");
1490 dsl_dataset_snapshot_sync(void *arg
, dmu_tx_t
*tx
)
1492 dsl_dataset_snapshot_arg_t
*ddsa
= arg
;
1493 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
1496 for (pair
= nvlist_next_nvpair(ddsa
->ddsa_snaps
, NULL
);
1497 pair
!= NULL
; pair
= nvlist_next_nvpair(ddsa
->ddsa_snaps
, pair
)) {
1500 char dsname
[ZFS_MAX_DATASET_NAME_LEN
];
1502 name
= nvpair_name(pair
);
1503 atp
= strchr(name
, '@');
1504 (void) strlcpy(dsname
, name
, atp
- name
+ 1);
1505 VERIFY0(dsl_dataset_hold(dp
, dsname
, FTAG
, &ds
));
1507 dsl_dataset_snapshot_sync_impl(ds
, atp
+ 1, tx
);
1508 if (ddsa
->ddsa_props
!= NULL
) {
1509 dsl_props_set_sync_impl(ds
->ds_prev
,
1510 ZPROP_SRC_LOCAL
, ddsa
->ddsa_props
, tx
);
1512 zvol_create_minors(dp
->dp_spa
, nvpair_name(pair
), B_TRUE
);
1513 dsl_dataset_rele(ds
, FTAG
);
1518 * The snapshots must all be in the same pool.
1519 * All-or-nothing: if there are any failures, nothing will be modified.
1522 dsl_dataset_snapshot(nvlist_t
*snaps
, nvlist_t
*props
, nvlist_t
*errors
)
1524 dsl_dataset_snapshot_arg_t ddsa
;
1526 boolean_t needsuspend
;
1530 nvlist_t
*suspended
= NULL
;
1532 pair
= nvlist_next_nvpair(snaps
, NULL
);
1535 firstname
= nvpair_name(pair
);
1537 error
= spa_open(firstname
, &spa
, FTAG
);
1540 needsuspend
= (spa_version(spa
) < SPA_VERSION_FAST_SNAP
);
1541 spa_close(spa
, FTAG
);
1544 suspended
= fnvlist_alloc();
1545 for (pair
= nvlist_next_nvpair(snaps
, NULL
); pair
!= NULL
;
1546 pair
= nvlist_next_nvpair(snaps
, pair
)) {
1547 char fsname
[ZFS_MAX_DATASET_NAME_LEN
];
1548 char *snapname
= nvpair_name(pair
);
1552 atp
= strchr(snapname
, '@');
1554 error
= SET_ERROR(EINVAL
);
1557 (void) strlcpy(fsname
, snapname
, atp
- snapname
+ 1);
1559 error
= zil_suspend(fsname
, &cookie
);
1562 fnvlist_add_uint64(suspended
, fsname
,
1567 ddsa
.ddsa_snaps
= snaps
;
1568 ddsa
.ddsa_props
= props
;
1569 ddsa
.ddsa_errors
= errors
;
1570 ddsa
.ddsa_cr
= CRED();
1573 error
= dsl_sync_task(firstname
, dsl_dataset_snapshot_check
,
1574 dsl_dataset_snapshot_sync
, &ddsa
,
1575 fnvlist_num_pairs(snaps
) * 3, ZFS_SPACE_CHECK_NORMAL
);
1578 if (suspended
!= NULL
) {
1579 for (pair
= nvlist_next_nvpair(suspended
, NULL
); pair
!= NULL
;
1580 pair
= nvlist_next_nvpair(suspended
, pair
)) {
1581 zil_resume((void *)(uintptr_t)
1582 fnvpair_value_uint64(pair
));
1584 fnvlist_free(suspended
);
1590 typedef struct dsl_dataset_snapshot_tmp_arg
{
1591 const char *ddsta_fsname
;
1592 const char *ddsta_snapname
;
1593 minor_t ddsta_cleanup_minor
;
1594 const char *ddsta_htag
;
1595 } dsl_dataset_snapshot_tmp_arg_t
;
1598 dsl_dataset_snapshot_tmp_check(void *arg
, dmu_tx_t
*tx
)
1600 dsl_dataset_snapshot_tmp_arg_t
*ddsta
= arg
;
1601 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
1605 error
= dsl_dataset_hold(dp
, ddsta
->ddsta_fsname
, FTAG
, &ds
);
1609 /* NULL cred means no limit check for tmp snapshot */
1610 error
= dsl_dataset_snapshot_check_impl(ds
, ddsta
->ddsta_snapname
,
1611 tx
, B_FALSE
, 0, NULL
);
1613 dsl_dataset_rele(ds
, FTAG
);
1617 if (spa_version(dp
->dp_spa
) < SPA_VERSION_USERREFS
) {
1618 dsl_dataset_rele(ds
, FTAG
);
1619 return (SET_ERROR(ENOTSUP
));
1621 error
= dsl_dataset_user_hold_check_one(NULL
, ddsta
->ddsta_htag
,
1624 dsl_dataset_rele(ds
, FTAG
);
1628 dsl_dataset_rele(ds
, FTAG
);
1633 dsl_dataset_snapshot_tmp_sync(void *arg
, dmu_tx_t
*tx
)
1635 dsl_dataset_snapshot_tmp_arg_t
*ddsta
= arg
;
1636 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
1637 dsl_dataset_t
*ds
= NULL
;
1639 VERIFY0(dsl_dataset_hold(dp
, ddsta
->ddsta_fsname
, FTAG
, &ds
));
1641 dsl_dataset_snapshot_sync_impl(ds
, ddsta
->ddsta_snapname
, tx
);
1642 dsl_dataset_user_hold_sync_one(ds
->ds_prev
, ddsta
->ddsta_htag
,
1643 ddsta
->ddsta_cleanup_minor
, gethrestime_sec(), tx
);
1644 dsl_destroy_snapshot_sync_impl(ds
->ds_prev
, B_TRUE
, tx
);
1646 dsl_dataset_rele(ds
, FTAG
);
1650 dsl_dataset_snapshot_tmp(const char *fsname
, const char *snapname
,
1651 minor_t cleanup_minor
, const char *htag
)
1653 dsl_dataset_snapshot_tmp_arg_t ddsta
;
1656 boolean_t needsuspend
;
1659 ddsta
.ddsta_fsname
= fsname
;
1660 ddsta
.ddsta_snapname
= snapname
;
1661 ddsta
.ddsta_cleanup_minor
= cleanup_minor
;
1662 ddsta
.ddsta_htag
= htag
;
1664 error
= spa_open(fsname
, &spa
, FTAG
);
1667 needsuspend
= (spa_version(spa
) < SPA_VERSION_FAST_SNAP
);
1668 spa_close(spa
, FTAG
);
1671 error
= zil_suspend(fsname
, &cookie
);
1676 error
= dsl_sync_task(fsname
, dsl_dataset_snapshot_tmp_check
,
1677 dsl_dataset_snapshot_tmp_sync
, &ddsta
, 3, ZFS_SPACE_CHECK_RESERVED
);
1686 dsl_dataset_sync(dsl_dataset_t
*ds
, zio_t
*zio
, dmu_tx_t
*tx
)
1688 ASSERT(dmu_tx_is_syncing(tx
));
1689 ASSERT(ds
->ds_objset
!= NULL
);
1690 ASSERT(dsl_dataset_phys(ds
)->ds_next_snap_obj
== 0);
1693 * in case we had to change ds_fsid_guid when we opened it,
1696 dmu_buf_will_dirty(ds
->ds_dbuf
, tx
);
1697 dsl_dataset_phys(ds
)->ds_fsid_guid
= ds
->ds_fsid_guid
;
1699 if (ds
->ds_resume_bytes
[tx
->tx_txg
& TXG_MASK
] != 0) {
1700 VERIFY0(zap_update(tx
->tx_pool
->dp_meta_objset
,
1701 ds
->ds_object
, DS_FIELD_RESUME_OBJECT
, 8, 1,
1702 &ds
->ds_resume_object
[tx
->tx_txg
& TXG_MASK
], tx
));
1703 VERIFY0(zap_update(tx
->tx_pool
->dp_meta_objset
,
1704 ds
->ds_object
, DS_FIELD_RESUME_OFFSET
, 8, 1,
1705 &ds
->ds_resume_offset
[tx
->tx_txg
& TXG_MASK
], tx
));
1706 VERIFY0(zap_update(tx
->tx_pool
->dp_meta_objset
,
1707 ds
->ds_object
, DS_FIELD_RESUME_BYTES
, 8, 1,
1708 &ds
->ds_resume_bytes
[tx
->tx_txg
& TXG_MASK
], tx
));
1709 ds
->ds_resume_object
[tx
->tx_txg
& TXG_MASK
] = 0;
1710 ds
->ds_resume_offset
[tx
->tx_txg
& TXG_MASK
] = 0;
1711 ds
->ds_resume_bytes
[tx
->tx_txg
& TXG_MASK
] = 0;
1714 dmu_objset_sync(ds
->ds_objset
, zio
, tx
);
1716 for (spa_feature_t f
= 0; f
< SPA_FEATURES
; f
++) {
1717 if (ds
->ds_feature_activation_needed
[f
]) {
1718 if (ds
->ds_feature_inuse
[f
])
1720 dsl_dataset_activate_feature(ds
->ds_object
, f
, tx
);
1721 ds
->ds_feature_inuse
[f
] = B_TRUE
;
1727 deadlist_enqueue_cb(void *arg
, const blkptr_t
*bp
, dmu_tx_t
*tx
)
1729 dsl_deadlist_t
*dl
= arg
;
1730 dsl_deadlist_insert(dl
, bp
, tx
);
1735 dsl_dataset_sync_done(dsl_dataset_t
*ds
, dmu_tx_t
*tx
)
1737 objset_t
*os
= ds
->ds_objset
;
1739 bplist_iterate(&ds
->ds_pending_deadlist
,
1740 deadlist_enqueue_cb
, &ds
->ds_deadlist
, tx
);
1742 if (os
->os_synced_dnodes
!= NULL
) {
1743 multilist_destroy(os
->os_synced_dnodes
);
1744 os
->os_synced_dnodes
= NULL
;
1747 ASSERT(!dmu_objset_is_dirty(os
, dmu_tx_get_txg(tx
)));
1749 dmu_buf_rele(ds
->ds_dbuf
, ds
);
1753 get_clones_stat(dsl_dataset_t
*ds
, nvlist_t
*nv
)
1756 objset_t
*mos
= ds
->ds_dir
->dd_pool
->dp_meta_objset
;
1759 nvlist_t
*propval
= fnvlist_alloc();
1762 ASSERT(dsl_pool_config_held(ds
->ds_dir
->dd_pool
));
1765 * We use nvlist_alloc() instead of fnvlist_alloc() because the
1766 * latter would allocate the list with NV_UNIQUE_NAME flag.
1767 * As a result, every time a clone name is appended to the list
1768 * it would be (linearly) searched for for a duplicate name.
1769 * We already know that all clone names must be unique and we
1770 * want avoid the quadratic complexity of double-checking that
1771 * because we can have a large number of clones.
1773 VERIFY0(nvlist_alloc(&val
, 0, KM_SLEEP
));
1776 * There may be missing entries in ds_next_clones_obj
1777 * due to a bug in a previous version of the code.
1778 * Only trust it if it has the right number of entries.
1780 if (dsl_dataset_phys(ds
)->ds_next_clones_obj
!= 0) {
1781 VERIFY0(zap_count(mos
, dsl_dataset_phys(ds
)->ds_next_clones_obj
,
1784 if (count
!= dsl_dataset_phys(ds
)->ds_num_children
- 1)
1786 for (zap_cursor_init(&zc
, mos
,
1787 dsl_dataset_phys(ds
)->ds_next_clones_obj
);
1788 zap_cursor_retrieve(&zc
, &za
) == 0;
1789 zap_cursor_advance(&zc
)) {
1790 dsl_dataset_t
*clone
;
1791 char buf
[ZFS_MAX_DATASET_NAME_LEN
];
1792 VERIFY0(dsl_dataset_hold_obj(ds
->ds_dir
->dd_pool
,
1793 za
.za_first_integer
, FTAG
, &clone
));
1794 dsl_dir_name(clone
->ds_dir
, buf
);
1795 fnvlist_add_boolean(val
, buf
);
1796 dsl_dataset_rele(clone
, FTAG
);
1798 zap_cursor_fini(&zc
);
1799 fnvlist_add_nvlist(propval
, ZPROP_VALUE
, val
);
1800 fnvlist_add_nvlist(nv
, zfs_prop_to_name(ZFS_PROP_CLONES
), propval
);
1803 nvlist_free(propval
);
1807 get_receive_resume_stats(dsl_dataset_t
*ds
, nvlist_t
*nv
)
1809 dsl_pool_t
*dp
= ds
->ds_dir
->dd_pool
;
1811 if (dsl_dataset_has_resume_receive_state(ds
)) {
1814 uint8_t *compressed
;
1816 nvlist_t
*token_nv
= fnvlist_alloc();
1817 size_t packed_size
, compressed_size
;
1819 if (zap_lookup(dp
->dp_meta_objset
, ds
->ds_object
,
1820 DS_FIELD_RESUME_FROMGUID
, sizeof (val
), 1, &val
) == 0) {
1821 fnvlist_add_uint64(token_nv
, "fromguid", val
);
1823 if (zap_lookup(dp
->dp_meta_objset
, ds
->ds_object
,
1824 DS_FIELD_RESUME_OBJECT
, sizeof (val
), 1, &val
) == 0) {
1825 fnvlist_add_uint64(token_nv
, "object", val
);
1827 if (zap_lookup(dp
->dp_meta_objset
, ds
->ds_object
,
1828 DS_FIELD_RESUME_OFFSET
, sizeof (val
), 1, &val
) == 0) {
1829 fnvlist_add_uint64(token_nv
, "offset", val
);
1831 if (zap_lookup(dp
->dp_meta_objset
, ds
->ds_object
,
1832 DS_FIELD_RESUME_BYTES
, sizeof (val
), 1, &val
) == 0) {
1833 fnvlist_add_uint64(token_nv
, "bytes", val
);
1835 if (zap_lookup(dp
->dp_meta_objset
, ds
->ds_object
,
1836 DS_FIELD_RESUME_TOGUID
, sizeof (val
), 1, &val
) == 0) {
1837 fnvlist_add_uint64(token_nv
, "toguid", val
);
1839 char buf
[MAXNAMELEN
];
1840 if (zap_lookup(dp
->dp_meta_objset
, ds
->ds_object
,
1841 DS_FIELD_RESUME_TONAME
, 1, sizeof (buf
), buf
) == 0) {
1842 fnvlist_add_string(token_nv
, "toname", buf
);
1844 if (zap_contains(dp
->dp_meta_objset
, ds
->ds_object
,
1845 DS_FIELD_RESUME_LARGEBLOCK
) == 0) {
1846 fnvlist_add_boolean(token_nv
, "largeblockok");
1848 if (zap_contains(dp
->dp_meta_objset
, ds
->ds_object
,
1849 DS_FIELD_RESUME_EMBEDOK
) == 0) {
1850 fnvlist_add_boolean(token_nv
, "embedok");
1852 if (zap_contains(dp
->dp_meta_objset
, ds
->ds_object
,
1853 DS_FIELD_RESUME_COMPRESSOK
) == 0) {
1854 fnvlist_add_boolean(token_nv
, "compressok");
1856 if (zap_contains(dp
->dp_meta_objset
, ds
->ds_object
,
1857 DS_FIELD_RESUME_RAWOK
) == 0) {
1858 fnvlist_add_boolean(token_nv
, "rawok");
1860 packed
= fnvlist_pack(token_nv
, &packed_size
);
1861 fnvlist_free(token_nv
);
1862 compressed
= kmem_alloc(packed_size
, KM_SLEEP
);
1864 compressed_size
= gzip_compress(packed
, compressed
,
1865 packed_size
, packed_size
, 6);
1868 fletcher_4_native_varsize(compressed
, compressed_size
, &cksum
);
1870 str
= kmem_alloc(compressed_size
* 2 + 1, KM_SLEEP
);
1871 for (int i
= 0; i
< compressed_size
; i
++) {
1872 (void) sprintf(str
+ i
* 2, "%02x", compressed
[i
]);
1874 str
[compressed_size
* 2] = '\0';
1875 char *propval
= kmem_asprintf("%u-%llx-%llx-%s",
1876 ZFS_SEND_RESUME_TOKEN_VERSION
,
1877 (longlong_t
)cksum
.zc_word
[0],
1878 (longlong_t
)packed_size
, str
);
1879 dsl_prop_nvlist_add_string(nv
,
1880 ZFS_PROP_RECEIVE_RESUME_TOKEN
, propval
);
1881 kmem_free(packed
, packed_size
);
1882 kmem_free(str
, compressed_size
* 2 + 1);
1883 kmem_free(compressed
, packed_size
);
1889 dsl_dataset_stats(dsl_dataset_t
*ds
, nvlist_t
*nv
)
1892 dsl_pool_t
*dp
= ds
->ds_dir
->dd_pool
;
1893 uint64_t refd
, avail
, uobjs
, aobjs
, ratio
;
1895 ASSERT(dsl_pool_config_held(dp
));
1897 ratio
= dsl_dataset_phys(ds
)->ds_compressed_bytes
== 0 ? 100 :
1898 (dsl_dataset_phys(ds
)->ds_uncompressed_bytes
* 100 /
1899 dsl_dataset_phys(ds
)->ds_compressed_bytes
);
1901 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_REFRATIO
, ratio
);
1902 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_LOGICALREFERENCED
,
1903 dsl_dataset_phys(ds
)->ds_uncompressed_bytes
);
1905 if (ds
->ds_is_snapshot
) {
1906 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_COMPRESSRATIO
, ratio
);
1907 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_USED
,
1908 dsl_dataset_phys(ds
)->ds_unique_bytes
);
1909 get_clones_stat(ds
, nv
);
1911 if (ds
->ds_prev
!= NULL
&& ds
->ds_prev
!= dp
->dp_origin_snap
) {
1912 char buf
[ZFS_MAX_DATASET_NAME_LEN
];
1913 dsl_dataset_name(ds
->ds_prev
, buf
);
1914 dsl_prop_nvlist_add_string(nv
, ZFS_PROP_PREV_SNAP
, buf
);
1917 dsl_dir_stats(ds
->ds_dir
, nv
);
1920 dsl_dataset_space(ds
, &refd
, &avail
, &uobjs
, &aobjs
);
1921 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_AVAILABLE
, avail
);
1922 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_REFERENCED
, refd
);
1924 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_CREATION
,
1925 dsl_dataset_phys(ds
)->ds_creation_time
);
1926 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_CREATETXG
,
1927 dsl_dataset_phys(ds
)->ds_creation_txg
);
1928 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_REFQUOTA
,
1930 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_REFRESERVATION
,
1932 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_GUID
,
1933 dsl_dataset_phys(ds
)->ds_guid
);
1934 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_UNIQUE
,
1935 dsl_dataset_phys(ds
)->ds_unique_bytes
);
1936 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_OBJSETID
,
1938 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_USERREFS
,
1940 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_DEFER_DESTROY
,
1941 DS_IS_DEFER_DESTROY(ds
) ? 1 : 0);
1942 dsl_dataset_crypt_stats(ds
, nv
);
1944 if (dsl_dataset_phys(ds
)->ds_prev_snap_obj
!= 0) {
1945 uint64_t written
, comp
, uncomp
;
1946 dsl_pool_t
*dp
= ds
->ds_dir
->dd_pool
;
1947 dsl_dataset_t
*prev
;
1949 err
= dsl_dataset_hold_obj(dp
,
1950 dsl_dataset_phys(ds
)->ds_prev_snap_obj
, FTAG
, &prev
);
1952 err
= dsl_dataset_space_written(prev
, ds
, &written
,
1954 dsl_dataset_rele(prev
, FTAG
);
1956 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_WRITTEN
,
1962 if (!dsl_dataset_is_snapshot(ds
)) {
1964 * A failed "newfs" (e.g. full) resumable receive leaves
1965 * the stats set on this dataset. Check here for the prop.
1967 get_receive_resume_stats(ds
, nv
);
1970 * A failed incremental resumable receive leaves the
1971 * stats set on our child named "%recv". Check the child
1974 /* 6 extra bytes for /%recv */
1975 char recvname
[ZFS_MAX_DATASET_NAME_LEN
+ 6];
1976 dsl_dataset_t
*recv_ds
;
1977 dsl_dataset_name(ds
, recvname
);
1978 if (strlcat(recvname
, "/", sizeof (recvname
)) <
1979 sizeof (recvname
) &&
1980 strlcat(recvname
, recv_clone_name
, sizeof (recvname
)) <
1981 sizeof (recvname
) &&
1982 dsl_dataset_hold(dp
, recvname
, FTAG
, &recv_ds
) == 0) {
1983 get_receive_resume_stats(recv_ds
, nv
);
1984 dsl_dataset_rele(recv_ds
, FTAG
);
1990 dsl_dataset_fast_stat(dsl_dataset_t
*ds
, dmu_objset_stats_t
*stat
)
1992 dsl_pool_t
*dp
= ds
->ds_dir
->dd_pool
;
1993 ASSERT(dsl_pool_config_held(dp
));
1995 stat
->dds_creation_txg
= dsl_dataset_phys(ds
)->ds_creation_txg
;
1996 stat
->dds_inconsistent
=
1997 dsl_dataset_phys(ds
)->ds_flags
& DS_FLAG_INCONSISTENT
;
1998 stat
->dds_guid
= dsl_dataset_phys(ds
)->ds_guid
;
1999 stat
->dds_origin
[0] = '\0';
2000 if (ds
->ds_is_snapshot
) {
2001 stat
->dds_is_snapshot
= B_TRUE
;
2002 stat
->dds_num_clones
=
2003 dsl_dataset_phys(ds
)->ds_num_children
- 1;
2005 stat
->dds_is_snapshot
= B_FALSE
;
2006 stat
->dds_num_clones
= 0;
2008 if (dsl_dir_is_clone(ds
->ds_dir
)) {
2011 VERIFY0(dsl_dataset_hold_obj(dp
,
2012 dsl_dir_phys(ds
->ds_dir
)->dd_origin_obj
,
2014 dsl_dataset_name(ods
, stat
->dds_origin
);
2015 dsl_dataset_rele(ods
, FTAG
);
2021 dsl_dataset_fsid_guid(dsl_dataset_t
*ds
)
2023 return (ds
->ds_fsid_guid
);
2027 dsl_dataset_space(dsl_dataset_t
*ds
,
2028 uint64_t *refdbytesp
, uint64_t *availbytesp
,
2029 uint64_t *usedobjsp
, uint64_t *availobjsp
)
2031 *refdbytesp
= dsl_dataset_phys(ds
)->ds_referenced_bytes
;
2032 *availbytesp
= dsl_dir_space_available(ds
->ds_dir
, NULL
, 0, TRUE
);
2033 if (ds
->ds_reserved
> dsl_dataset_phys(ds
)->ds_unique_bytes
)
2035 ds
->ds_reserved
- dsl_dataset_phys(ds
)->ds_unique_bytes
;
2036 if (ds
->ds_quota
!= 0) {
2038 * Adjust available bytes according to refquota
2040 if (*refdbytesp
< ds
->ds_quota
)
2041 *availbytesp
= MIN(*availbytesp
,
2042 ds
->ds_quota
- *refdbytesp
);
2046 rrw_enter(&ds
->ds_bp_rwlock
, RW_READER
, FTAG
);
2047 *usedobjsp
= BP_GET_FILL(&dsl_dataset_phys(ds
)->ds_bp
);
2048 rrw_exit(&ds
->ds_bp_rwlock
, FTAG
);
2049 *availobjsp
= DN_MAX_OBJECT
- *usedobjsp
;
2053 dsl_dataset_modified_since_snap(dsl_dataset_t
*ds
, dsl_dataset_t
*snap
)
2055 ASSERTV(dsl_pool_t
*dp
= ds
->ds_dir
->dd_pool
);
2058 ASSERT(dsl_pool_config_held(dp
));
2061 rrw_enter(&ds
->ds_bp_rwlock
, RW_READER
, FTAG
);
2062 birth
= dsl_dataset_get_blkptr(ds
)->blk_birth
;
2063 rrw_exit(&ds
->ds_bp_rwlock
, FTAG
);
2064 if (birth
> dsl_dataset_phys(snap
)->ds_creation_txg
) {
2065 objset_t
*os
, *os_snap
;
2067 * It may be that only the ZIL differs, because it was
2068 * reset in the head. Don't count that as being
2071 if (dmu_objset_from_ds(ds
, &os
) != 0)
2073 if (dmu_objset_from_ds(snap
, &os_snap
) != 0)
2075 return (bcmp(&os
->os_phys
->os_meta_dnode
,
2076 &os_snap
->os_phys
->os_meta_dnode
,
2077 sizeof (os
->os_phys
->os_meta_dnode
)) != 0);
2082 typedef struct dsl_dataset_rename_snapshot_arg
{
2083 const char *ddrsa_fsname
;
2084 const char *ddrsa_oldsnapname
;
2085 const char *ddrsa_newsnapname
;
2086 boolean_t ddrsa_recursive
;
2088 } dsl_dataset_rename_snapshot_arg_t
;
2092 dsl_dataset_rename_snapshot_check_impl(dsl_pool_t
*dp
,
2093 dsl_dataset_t
*hds
, void *arg
)
2095 dsl_dataset_rename_snapshot_arg_t
*ddrsa
= arg
;
2099 error
= dsl_dataset_snap_lookup(hds
, ddrsa
->ddrsa_oldsnapname
, &val
);
2101 /* ignore nonexistent snapshots */
2102 return (error
== ENOENT
? 0 : error
);
2105 /* new name should not exist */
2106 error
= dsl_dataset_snap_lookup(hds
, ddrsa
->ddrsa_newsnapname
, &val
);
2108 error
= SET_ERROR(EEXIST
);
2109 else if (error
== ENOENT
)
2112 /* dataset name + 1 for the "@" + the new snapshot name must fit */
2113 if (dsl_dir_namelen(hds
->ds_dir
) + 1 +
2114 strlen(ddrsa
->ddrsa_newsnapname
) >= ZFS_MAX_DATASET_NAME_LEN
)
2115 error
= SET_ERROR(ENAMETOOLONG
);
2121 dsl_dataset_rename_snapshot_check(void *arg
, dmu_tx_t
*tx
)
2123 dsl_dataset_rename_snapshot_arg_t
*ddrsa
= arg
;
2124 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
2128 error
= dsl_dataset_hold(dp
, ddrsa
->ddrsa_fsname
, FTAG
, &hds
);
2132 if (ddrsa
->ddrsa_recursive
) {
2133 error
= dmu_objset_find_dp(dp
, hds
->ds_dir
->dd_object
,
2134 dsl_dataset_rename_snapshot_check_impl
, ddrsa
,
2137 error
= dsl_dataset_rename_snapshot_check_impl(dp
, hds
, ddrsa
);
2139 dsl_dataset_rele(hds
, FTAG
);
2144 dsl_dataset_rename_snapshot_sync_impl(dsl_pool_t
*dp
,
2145 dsl_dataset_t
*hds
, void *arg
)
2147 dsl_dataset_rename_snapshot_arg_t
*ddrsa
= arg
;
2150 dmu_tx_t
*tx
= ddrsa
->ddrsa_tx
;
2153 error
= dsl_dataset_snap_lookup(hds
, ddrsa
->ddrsa_oldsnapname
, &val
);
2154 ASSERT(error
== 0 || error
== ENOENT
);
2155 if (error
== ENOENT
) {
2156 /* ignore nonexistent snapshots */
2160 VERIFY0(dsl_dataset_hold_obj(dp
, val
, FTAG
, &ds
));
2162 /* log before we change the name */
2163 spa_history_log_internal_ds(ds
, "rename", tx
,
2164 "-> @%s", ddrsa
->ddrsa_newsnapname
);
2166 VERIFY0(dsl_dataset_snap_remove(hds
, ddrsa
->ddrsa_oldsnapname
, tx
,
2168 mutex_enter(&ds
->ds_lock
);
2169 (void) strlcpy(ds
->ds_snapname
, ddrsa
->ddrsa_newsnapname
,
2170 sizeof (ds
->ds_snapname
));
2171 mutex_exit(&ds
->ds_lock
);
2172 VERIFY0(zap_add(dp
->dp_meta_objset
,
2173 dsl_dataset_phys(hds
)->ds_snapnames_zapobj
,
2174 ds
->ds_snapname
, 8, 1, &ds
->ds_object
, tx
));
2175 zvol_rename_minors(dp
->dp_spa
, ddrsa
->ddrsa_oldsnapname
,
2176 ddrsa
->ddrsa_newsnapname
, B_TRUE
);
2178 dsl_dataset_rele(ds
, FTAG
);
2183 dsl_dataset_rename_snapshot_sync(void *arg
, dmu_tx_t
*tx
)
2185 dsl_dataset_rename_snapshot_arg_t
*ddrsa
= arg
;
2186 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
2187 dsl_dataset_t
*hds
= NULL
;
2189 VERIFY0(dsl_dataset_hold(dp
, ddrsa
->ddrsa_fsname
, FTAG
, &hds
));
2190 ddrsa
->ddrsa_tx
= tx
;
2191 if (ddrsa
->ddrsa_recursive
) {
2192 VERIFY0(dmu_objset_find_dp(dp
, hds
->ds_dir
->dd_object
,
2193 dsl_dataset_rename_snapshot_sync_impl
, ddrsa
,
2196 VERIFY0(dsl_dataset_rename_snapshot_sync_impl(dp
, hds
, ddrsa
));
2198 dsl_dataset_rele(hds
, FTAG
);
2202 dsl_dataset_rename_snapshot(const char *fsname
,
2203 const char *oldsnapname
, const char *newsnapname
, boolean_t recursive
)
2205 dsl_dataset_rename_snapshot_arg_t ddrsa
;
2207 ddrsa
.ddrsa_fsname
= fsname
;
2208 ddrsa
.ddrsa_oldsnapname
= oldsnapname
;
2209 ddrsa
.ddrsa_newsnapname
= newsnapname
;
2210 ddrsa
.ddrsa_recursive
= recursive
;
2212 return (dsl_sync_task(fsname
, dsl_dataset_rename_snapshot_check
,
2213 dsl_dataset_rename_snapshot_sync
, &ddrsa
,
2214 1, ZFS_SPACE_CHECK_RESERVED
));
2218 * If we're doing an ownership handoff, we need to make sure that there is
2219 * only one long hold on the dataset. We're not allowed to change anything here
2220 * so we don't permanently release the long hold or regular hold here. We want
2221 * to do this only when syncing to avoid the dataset unexpectedly going away
2222 * when we release the long hold.
2225 dsl_dataset_handoff_check(dsl_dataset_t
*ds
, void *owner
, dmu_tx_t
*tx
)
2229 if (!dmu_tx_is_syncing(tx
))
2232 if (owner
!= NULL
) {
2233 VERIFY3P(ds
->ds_owner
, ==, owner
);
2234 dsl_dataset_long_rele(ds
, owner
);
2237 held
= dsl_dataset_long_held(ds
);
2240 dsl_dataset_long_hold(ds
, owner
);
2243 return (SET_ERROR(EBUSY
));
2248 typedef struct dsl_dataset_rollback_arg
{
2249 const char *ddra_fsname
;
2250 const char *ddra_tosnap
;
2252 nvlist_t
*ddra_result
;
2253 } dsl_dataset_rollback_arg_t
;
2256 dsl_dataset_rollback_check(void *arg
, dmu_tx_t
*tx
)
2258 dsl_dataset_rollback_arg_t
*ddra
= arg
;
2259 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
2261 int64_t unused_refres_delta
;
2264 error
= dsl_dataset_hold(dp
, ddra
->ddra_fsname
, FTAG
, &ds
);
2268 /* must not be a snapshot */
2269 if (ds
->ds_is_snapshot
) {
2270 dsl_dataset_rele(ds
, FTAG
);
2271 return (SET_ERROR(EINVAL
));
2274 /* must have a most recent snapshot */
2275 if (dsl_dataset_phys(ds
)->ds_prev_snap_txg
< TXG_INITIAL
) {
2276 dsl_dataset_rele(ds
, FTAG
);
2277 return (SET_ERROR(EINVAL
));
2281 * No rollback to a snapshot created in the current txg, because
2282 * the rollback may dirty the dataset and create blocks that are
2283 * not reachable from the rootbp while having a birth txg that
2284 * falls into the snapshot's range.
2286 if (dmu_tx_is_syncing(tx
) &&
2287 dsl_dataset_phys(ds
)->ds_prev_snap_txg
>= tx
->tx_txg
) {
2288 dsl_dataset_rele(ds
, FTAG
);
2289 return (SET_ERROR(EAGAIN
));
2293 * If the expected target snapshot is specified, then check that
2294 * the latest snapshot is it.
2296 if (ddra
->ddra_tosnap
!= NULL
) {
2297 char namebuf
[ZFS_MAX_DATASET_NAME_LEN
];
2299 dsl_dataset_name(ds
->ds_prev
, namebuf
);
2300 if (strcmp(namebuf
, ddra
->ddra_tosnap
) != 0)
2301 return (SET_ERROR(EXDEV
));
2304 /* must not have any bookmarks after the most recent snapshot */
2305 nvlist_t
*proprequest
= fnvlist_alloc();
2306 fnvlist_add_boolean(proprequest
, zfs_prop_to_name(ZFS_PROP_CREATETXG
));
2307 nvlist_t
*bookmarks
= fnvlist_alloc();
2308 error
= dsl_get_bookmarks_impl(ds
, proprequest
, bookmarks
);
2309 fnvlist_free(proprequest
);
2312 for (nvpair_t
*pair
= nvlist_next_nvpair(bookmarks
, NULL
);
2313 pair
!= NULL
; pair
= nvlist_next_nvpair(bookmarks
, pair
)) {
2315 fnvlist_lookup_nvlist(fnvpair_value_nvlist(pair
),
2316 zfs_prop_to_name(ZFS_PROP_CREATETXG
));
2317 uint64_t createtxg
= fnvlist_lookup_uint64(valuenv
, "value");
2318 if (createtxg
> dsl_dataset_phys(ds
)->ds_prev_snap_txg
) {
2319 fnvlist_free(bookmarks
);
2320 dsl_dataset_rele(ds
, FTAG
);
2321 return (SET_ERROR(EEXIST
));
2324 fnvlist_free(bookmarks
);
2326 error
= dsl_dataset_handoff_check(ds
, ddra
->ddra_owner
, tx
);
2328 dsl_dataset_rele(ds
, FTAG
);
2333 * Check if the snap we are rolling back to uses more than
2336 if (ds
->ds_quota
!= 0 &&
2337 dsl_dataset_phys(ds
->ds_prev
)->ds_referenced_bytes
> ds
->ds_quota
) {
2338 dsl_dataset_rele(ds
, FTAG
);
2339 return (SET_ERROR(EDQUOT
));
2343 * When we do the clone swap, we will temporarily use more space
2344 * due to the refreservation (the head will no longer have any
2345 * unique space, so the entire amount of the refreservation will need
2346 * to be free). We will immediately destroy the clone, freeing
2347 * this space, but the freeing happens over many txg's.
2349 unused_refres_delta
= (int64_t)MIN(ds
->ds_reserved
,
2350 dsl_dataset_phys(ds
)->ds_unique_bytes
);
2352 if (unused_refres_delta
> 0 &&
2353 unused_refres_delta
>
2354 dsl_dir_space_available(ds
->ds_dir
, NULL
, 0, TRUE
)) {
2355 dsl_dataset_rele(ds
, FTAG
);
2356 return (SET_ERROR(ENOSPC
));
2359 dsl_dataset_rele(ds
, FTAG
);
2364 dsl_dataset_rollback_sync(void *arg
, dmu_tx_t
*tx
)
2366 dsl_dataset_rollback_arg_t
*ddra
= arg
;
2367 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
2368 dsl_dataset_t
*ds
, *clone
;
2370 char namebuf
[ZFS_MAX_DATASET_NAME_LEN
];
2372 VERIFY0(dsl_dataset_hold(dp
, ddra
->ddra_fsname
, FTAG
, &ds
));
2374 dsl_dataset_name(ds
->ds_prev
, namebuf
);
2375 fnvlist_add_string(ddra
->ddra_result
, "target", namebuf
);
2377 cloneobj
= dsl_dataset_create_sync(ds
->ds_dir
, "%rollback",
2378 ds
->ds_prev
, DS_CREATE_FLAG_NODIRTY
, kcred
, NULL
, tx
);
2380 VERIFY0(dsl_dataset_hold_obj(dp
, cloneobj
, FTAG
, &clone
));
2382 dsl_dataset_clone_swap_sync_impl(clone
, ds
, tx
);
2383 dsl_dataset_zero_zil(ds
, tx
);
2385 dsl_destroy_head_sync_impl(clone
, tx
);
2387 dsl_dataset_rele(clone
, FTAG
);
2388 dsl_dataset_rele(ds
, FTAG
);
2392 * Rolls back the given filesystem or volume to the most recent snapshot.
2393 * The name of the most recent snapshot will be returned under key "target"
2394 * in the result nvlist.
2397 * - The existing dataset MUST be owned by the specified owner at entry
2398 * - Upon return, dataset will still be held by the same owner, whether we
2401 * This mode is required any time the existing filesystem is mounted. See
2402 * notes above zfs_suspend_fs() for further details.
2405 dsl_dataset_rollback(const char *fsname
, const char *tosnap
, void *owner
,
2408 dsl_dataset_rollback_arg_t ddra
;
2410 ddra
.ddra_fsname
= fsname
;
2411 ddra
.ddra_tosnap
= tosnap
;
2412 ddra
.ddra_owner
= owner
;
2413 ddra
.ddra_result
= result
;
2415 return (dsl_sync_task(fsname
, dsl_dataset_rollback_check
,
2416 dsl_dataset_rollback_sync
, &ddra
,
2417 1, ZFS_SPACE_CHECK_RESERVED
));
2420 struct promotenode
{
2425 typedef struct dsl_dataset_promote_arg
{
2426 const char *ddpa_clonename
;
2427 dsl_dataset_t
*ddpa_clone
;
2428 list_t shared_snaps
, origin_snaps
, clone_snaps
;
2429 dsl_dataset_t
*origin_origin
; /* origin of the origin */
2430 uint64_t used
, comp
, uncomp
, unique
, cloneusedsnap
, originusedsnap
;
2433 } dsl_dataset_promote_arg_t
;
2435 static int snaplist_space(list_t
*l
, uint64_t mintxg
, uint64_t *spacep
);
2436 static int promote_hold(dsl_dataset_promote_arg_t
*ddpa
, dsl_pool_t
*dp
,
2438 static void promote_rele(dsl_dataset_promote_arg_t
*ddpa
, void *tag
);
2441 dsl_dataset_promote_check(void *arg
, dmu_tx_t
*tx
)
2443 dsl_dataset_promote_arg_t
*ddpa
= arg
;
2444 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
2446 struct promotenode
*snap
;
2447 dsl_dataset_t
*origin_ds
;
2451 size_t max_snap_len
;
2453 err
= promote_hold(ddpa
, dp
, FTAG
);
2457 hds
= ddpa
->ddpa_clone
;
2458 max_snap_len
= MAXNAMELEN
- strlen(ddpa
->ddpa_clonename
) - 1;
2460 if (dsl_dataset_phys(hds
)->ds_flags
& DS_FLAG_NOPROMOTE
) {
2461 promote_rele(ddpa
, FTAG
);
2462 return (SET_ERROR(EXDEV
));
2465 snap
= list_head(&ddpa
->shared_snaps
);
2467 err
= SET_ERROR(ENOENT
);
2470 origin_ds
= snap
->ds
;
2473 * Encrypted clones share a DSL Crypto Key with their origin's dsl dir.
2474 * When doing a promote we must make sure the encryption root for
2475 * both the target and the target's origin does not change to avoid
2476 * needing to rewrap encryption keys
2478 err
= dsl_dataset_promote_crypt_check(hds
->ds_dir
, origin_ds
->ds_dir
);
2483 * Compute and check the amount of space to transfer. Since this is
2484 * so expensive, don't do the preliminary check.
2486 if (!dmu_tx_is_syncing(tx
)) {
2487 promote_rele(ddpa
, FTAG
);
2491 /* compute origin's new unique space */
2492 snap
= list_tail(&ddpa
->clone_snaps
);
2493 ASSERT3U(dsl_dataset_phys(snap
->ds
)->ds_prev_snap_obj
, ==,
2494 origin_ds
->ds_object
);
2495 dsl_deadlist_space_range(&snap
->ds
->ds_deadlist
,
2496 dsl_dataset_phys(origin_ds
)->ds_prev_snap_txg
, UINT64_MAX
,
2497 &ddpa
->unique
, &unused
, &unused
);
2500 * Walk the snapshots that we are moving
2502 * Compute space to transfer. Consider the incremental changes
2503 * to used by each snapshot:
2504 * (my used) = (prev's used) + (blocks born) - (blocks killed)
2505 * So each snapshot gave birth to:
2506 * (blocks born) = (my used) - (prev's used) + (blocks killed)
2507 * So a sequence would look like:
2508 * (uN - u(N-1) + kN) + ... + (u1 - u0 + k1) + (u0 - 0 + k0)
2509 * Which simplifies to:
2510 * uN + kN + kN-1 + ... + k1 + k0
2511 * Note however, if we stop before we reach the ORIGIN we get:
2512 * uN + kN + kN-1 + ... + kM - uM-1
2515 ddpa
->used
= dsl_dataset_phys(origin_ds
)->ds_referenced_bytes
;
2516 ddpa
->comp
= dsl_dataset_phys(origin_ds
)->ds_compressed_bytes
;
2517 ddpa
->uncomp
= dsl_dataset_phys(origin_ds
)->ds_uncompressed_bytes
;
2518 for (snap
= list_head(&ddpa
->shared_snaps
); snap
;
2519 snap
= list_next(&ddpa
->shared_snaps
, snap
)) {
2520 uint64_t val
, dlused
, dlcomp
, dluncomp
;
2521 dsl_dataset_t
*ds
= snap
->ds
;
2526 * If there are long holds, we won't be able to evict
2529 if (dsl_dataset_long_held(ds
)) {
2530 err
= SET_ERROR(EBUSY
);
2534 /* Check that the snapshot name does not conflict */
2535 VERIFY0(dsl_dataset_get_snapname(ds
));
2536 if (strlen(ds
->ds_snapname
) >= max_snap_len
) {
2537 err
= SET_ERROR(ENAMETOOLONG
);
2540 err
= dsl_dataset_snap_lookup(hds
, ds
->ds_snapname
, &val
);
2542 (void) strcpy(ddpa
->err_ds
, snap
->ds
->ds_snapname
);
2543 err
= SET_ERROR(EEXIST
);
2549 /* The very first snapshot does not have a deadlist */
2550 if (dsl_dataset_phys(ds
)->ds_prev_snap_obj
== 0)
2553 dsl_deadlist_space(&ds
->ds_deadlist
,
2554 &dlused
, &dlcomp
, &dluncomp
);
2555 ddpa
->used
+= dlused
;
2556 ddpa
->comp
+= dlcomp
;
2557 ddpa
->uncomp
+= dluncomp
;
2561 * If we are a clone of a clone then we never reached ORIGIN,
2562 * so we need to subtract out the clone origin's used space.
2564 if (ddpa
->origin_origin
) {
2566 dsl_dataset_phys(ddpa
->origin_origin
)->ds_referenced_bytes
;
2568 dsl_dataset_phys(ddpa
->origin_origin
)->ds_compressed_bytes
;
2570 dsl_dataset_phys(ddpa
->origin_origin
)->
2571 ds_uncompressed_bytes
;
2574 /* Check that there is enough space and limit headroom here */
2575 err
= dsl_dir_transfer_possible(origin_ds
->ds_dir
, hds
->ds_dir
,
2576 0, ss_mv_cnt
, ddpa
->used
, ddpa
->cr
);
2581 * Compute the amounts of space that will be used by snapshots
2582 * after the promotion (for both origin and clone). For each,
2583 * it is the amount of space that will be on all of their
2584 * deadlists (that was not born before their new origin).
2586 if (dsl_dir_phys(hds
->ds_dir
)->dd_flags
& DD_FLAG_USED_BREAKDOWN
) {
2590 * Note, typically this will not be a clone of a clone,
2591 * so dd_origin_txg will be < TXG_INITIAL, so
2592 * these snaplist_space() -> dsl_deadlist_space_range()
2593 * calls will be fast because they do not have to
2594 * iterate over all bps.
2596 snap
= list_head(&ddpa
->origin_snaps
);
2598 err
= SET_ERROR(ENOENT
);
2601 err
= snaplist_space(&ddpa
->shared_snaps
,
2602 snap
->ds
->ds_dir
->dd_origin_txg
, &ddpa
->cloneusedsnap
);
2606 err
= snaplist_space(&ddpa
->clone_snaps
,
2607 snap
->ds
->ds_dir
->dd_origin_txg
, &space
);
2610 ddpa
->cloneusedsnap
+= space
;
2612 if (dsl_dir_phys(origin_ds
->ds_dir
)->dd_flags
&
2613 DD_FLAG_USED_BREAKDOWN
) {
2614 err
= snaplist_space(&ddpa
->origin_snaps
,
2615 dsl_dataset_phys(origin_ds
)->ds_creation_txg
,
2616 &ddpa
->originusedsnap
);
2622 promote_rele(ddpa
, FTAG
);
2627 dsl_dataset_promote_sync(void *arg
, dmu_tx_t
*tx
)
2629 dsl_dataset_promote_arg_t
*ddpa
= arg
;
2630 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
2632 struct promotenode
*snap
;
2633 dsl_dataset_t
*origin_ds
;
2634 dsl_dataset_t
*origin_head
;
2636 dsl_dir_t
*odd
= NULL
;
2637 uint64_t oldnext_obj
;
2640 VERIFY0(promote_hold(ddpa
, dp
, FTAG
));
2641 hds
= ddpa
->ddpa_clone
;
2643 ASSERT0(dsl_dataset_phys(hds
)->ds_flags
& DS_FLAG_NOPROMOTE
);
2645 snap
= list_head(&ddpa
->shared_snaps
);
2646 origin_ds
= snap
->ds
;
2649 snap
= list_head(&ddpa
->origin_snaps
);
2650 origin_head
= snap
->ds
;
2653 * We need to explicitly open odd, since origin_ds's dd will be
2656 VERIFY0(dsl_dir_hold_obj(dp
, origin_ds
->ds_dir
->dd_object
,
2659 dsl_dataset_promote_crypt_sync(hds
->ds_dir
, odd
, tx
);
2661 /* change origin's next snap */
2662 dmu_buf_will_dirty(origin_ds
->ds_dbuf
, tx
);
2663 oldnext_obj
= dsl_dataset_phys(origin_ds
)->ds_next_snap_obj
;
2664 snap
= list_tail(&ddpa
->clone_snaps
);
2665 ASSERT3U(dsl_dataset_phys(snap
->ds
)->ds_prev_snap_obj
, ==,
2666 origin_ds
->ds_object
);
2667 dsl_dataset_phys(origin_ds
)->ds_next_snap_obj
= snap
->ds
->ds_object
;
2669 /* change the origin's next clone */
2670 if (dsl_dataset_phys(origin_ds
)->ds_next_clones_obj
) {
2671 dsl_dataset_remove_from_next_clones(origin_ds
,
2672 snap
->ds
->ds_object
, tx
);
2673 VERIFY0(zap_add_int(dp
->dp_meta_objset
,
2674 dsl_dataset_phys(origin_ds
)->ds_next_clones_obj
,
2679 dmu_buf_will_dirty(dd
->dd_dbuf
, tx
);
2680 ASSERT3U(dsl_dir_phys(dd
)->dd_origin_obj
, ==, origin_ds
->ds_object
);
2681 dsl_dir_phys(dd
)->dd_origin_obj
= dsl_dir_phys(odd
)->dd_origin_obj
;
2682 dd
->dd_origin_txg
= origin_head
->ds_dir
->dd_origin_txg
;
2683 dmu_buf_will_dirty(odd
->dd_dbuf
, tx
);
2684 dsl_dir_phys(odd
)->dd_origin_obj
= origin_ds
->ds_object
;
2685 origin_head
->ds_dir
->dd_origin_txg
=
2686 dsl_dataset_phys(origin_ds
)->ds_creation_txg
;
2688 /* change dd_clone entries */
2689 if (spa_version(dp
->dp_spa
) >= SPA_VERSION_DIR_CLONES
) {
2690 VERIFY0(zap_remove_int(dp
->dp_meta_objset
,
2691 dsl_dir_phys(odd
)->dd_clones
, hds
->ds_object
, tx
));
2692 VERIFY0(zap_add_int(dp
->dp_meta_objset
,
2693 dsl_dir_phys(ddpa
->origin_origin
->ds_dir
)->dd_clones
,
2694 hds
->ds_object
, tx
));
2696 VERIFY0(zap_remove_int(dp
->dp_meta_objset
,
2697 dsl_dir_phys(ddpa
->origin_origin
->ds_dir
)->dd_clones
,
2698 origin_head
->ds_object
, tx
));
2699 if (dsl_dir_phys(dd
)->dd_clones
== 0) {
2700 dsl_dir_phys(dd
)->dd_clones
=
2701 zap_create(dp
->dp_meta_objset
, DMU_OT_DSL_CLONES
,
2702 DMU_OT_NONE
, 0, tx
);
2704 VERIFY0(zap_add_int(dp
->dp_meta_objset
,
2705 dsl_dir_phys(dd
)->dd_clones
, origin_head
->ds_object
, tx
));
2708 /* move snapshots to this dir */
2709 for (snap
= list_head(&ddpa
->shared_snaps
); snap
;
2710 snap
= list_next(&ddpa
->shared_snaps
, snap
)) {
2711 dsl_dataset_t
*ds
= snap
->ds
;
2714 * Property callbacks are registered to a particular
2715 * dsl_dir. Since ours is changing, evict the objset
2716 * so that they will be unregistered from the old dsl_dir.
2718 if (ds
->ds_objset
) {
2719 dmu_objset_evict(ds
->ds_objset
);
2720 ds
->ds_objset
= NULL
;
2723 /* move snap name entry */
2724 VERIFY0(dsl_dataset_get_snapname(ds
));
2725 VERIFY0(dsl_dataset_snap_remove(origin_head
,
2726 ds
->ds_snapname
, tx
, B_TRUE
));
2727 VERIFY0(zap_add(dp
->dp_meta_objset
,
2728 dsl_dataset_phys(hds
)->ds_snapnames_zapobj
, ds
->ds_snapname
,
2729 8, 1, &ds
->ds_object
, tx
));
2730 dsl_fs_ss_count_adjust(hds
->ds_dir
, 1,
2731 DD_FIELD_SNAPSHOT_COUNT
, tx
);
2733 /* change containing dsl_dir */
2734 dmu_buf_will_dirty(ds
->ds_dbuf
, tx
);
2735 ASSERT3U(dsl_dataset_phys(ds
)->ds_dir_obj
, ==, odd
->dd_object
);
2736 dsl_dataset_phys(ds
)->ds_dir_obj
= dd
->dd_object
;
2737 ASSERT3P(ds
->ds_dir
, ==, odd
);
2738 dsl_dir_rele(ds
->ds_dir
, ds
);
2739 VERIFY0(dsl_dir_hold_obj(dp
, dd
->dd_object
,
2740 NULL
, ds
, &ds
->ds_dir
));
2742 /* move any clone references */
2743 if (dsl_dataset_phys(ds
)->ds_next_clones_obj
&&
2744 spa_version(dp
->dp_spa
) >= SPA_VERSION_DIR_CLONES
) {
2748 for (zap_cursor_init(&zc
, dp
->dp_meta_objset
,
2749 dsl_dataset_phys(ds
)->ds_next_clones_obj
);
2750 zap_cursor_retrieve(&zc
, &za
) == 0;
2751 zap_cursor_advance(&zc
)) {
2752 dsl_dataset_t
*cnds
;
2755 if (za
.za_first_integer
== oldnext_obj
) {
2757 * We've already moved the
2758 * origin's reference.
2763 VERIFY0(dsl_dataset_hold_obj(dp
,
2764 za
.za_first_integer
, FTAG
, &cnds
));
2765 o
= dsl_dir_phys(cnds
->ds_dir
)->
2766 dd_head_dataset_obj
;
2768 VERIFY0(zap_remove_int(dp
->dp_meta_objset
,
2769 dsl_dir_phys(odd
)->dd_clones
, o
, tx
));
2770 VERIFY0(zap_add_int(dp
->dp_meta_objset
,
2771 dsl_dir_phys(dd
)->dd_clones
, o
, tx
));
2772 dsl_dataset_rele(cnds
, FTAG
);
2774 zap_cursor_fini(&zc
);
2777 ASSERT(!dsl_prop_hascb(ds
));
2781 * Change space accounting.
2782 * Note, pa->*usedsnap and dd_used_breakdown[SNAP] will either
2783 * both be valid, or both be 0 (resulting in delta == 0). This
2784 * is true for each of {clone,origin} independently.
2787 delta
= ddpa
->cloneusedsnap
-
2788 dsl_dir_phys(dd
)->dd_used_breakdown
[DD_USED_SNAP
];
2789 ASSERT3S(delta
, >=, 0);
2790 ASSERT3U(ddpa
->used
, >=, delta
);
2791 dsl_dir_diduse_space(dd
, DD_USED_SNAP
, delta
, 0, 0, tx
);
2792 dsl_dir_diduse_space(dd
, DD_USED_HEAD
,
2793 ddpa
->used
- delta
, ddpa
->comp
, ddpa
->uncomp
, tx
);
2795 delta
= ddpa
->originusedsnap
-
2796 dsl_dir_phys(odd
)->dd_used_breakdown
[DD_USED_SNAP
];
2797 ASSERT3S(delta
, <=, 0);
2798 ASSERT3U(ddpa
->used
, >=, -delta
);
2799 dsl_dir_diduse_space(odd
, DD_USED_SNAP
, delta
, 0, 0, tx
);
2800 dsl_dir_diduse_space(odd
, DD_USED_HEAD
,
2801 -ddpa
->used
- delta
, -ddpa
->comp
, -ddpa
->uncomp
, tx
);
2803 dsl_dataset_phys(origin_ds
)->ds_unique_bytes
= ddpa
->unique
;
2805 /* log history record */
2806 spa_history_log_internal_ds(hds
, "promote", tx
, "");
2808 dsl_dir_rele(odd
, FTAG
);
2809 promote_rele(ddpa
, FTAG
);
2813 * Make a list of dsl_dataset_t's for the snapshots between first_obj
2814 * (exclusive) and last_obj (inclusive). The list will be in reverse
2815 * order (last_obj will be the list_head()). If first_obj == 0, do all
2816 * snapshots back to this dataset's origin.
2819 snaplist_make(dsl_pool_t
*dp
,
2820 uint64_t first_obj
, uint64_t last_obj
, list_t
*l
, void *tag
)
2822 uint64_t obj
= last_obj
;
2824 list_create(l
, sizeof (struct promotenode
),
2825 offsetof(struct promotenode
, link
));
2827 while (obj
!= first_obj
) {
2829 struct promotenode
*snap
;
2832 err
= dsl_dataset_hold_obj(dp
, obj
, tag
, &ds
);
2833 ASSERT(err
!= ENOENT
);
2838 first_obj
= dsl_dir_phys(ds
->ds_dir
)->dd_origin_obj
;
2840 snap
= kmem_alloc(sizeof (*snap
), KM_SLEEP
);
2842 list_insert_tail(l
, snap
);
2843 obj
= dsl_dataset_phys(ds
)->ds_prev_snap_obj
;
2850 snaplist_space(list_t
*l
, uint64_t mintxg
, uint64_t *spacep
)
2852 struct promotenode
*snap
;
2855 for (snap
= list_head(l
); snap
; snap
= list_next(l
, snap
)) {
2856 uint64_t used
, comp
, uncomp
;
2857 dsl_deadlist_space_range(&snap
->ds
->ds_deadlist
,
2858 mintxg
, UINT64_MAX
, &used
, &comp
, &uncomp
);
2865 snaplist_destroy(list_t
*l
, void *tag
)
2867 struct promotenode
*snap
;
2869 if (l
== NULL
|| !list_link_active(&l
->list_head
))
2872 while ((snap
= list_tail(l
)) != NULL
) {
2873 list_remove(l
, snap
);
2874 dsl_dataset_rele(snap
->ds
, tag
);
2875 kmem_free(snap
, sizeof (*snap
));
2881 promote_hold(dsl_dataset_promote_arg_t
*ddpa
, dsl_pool_t
*dp
, void *tag
)
2885 struct promotenode
*snap
;
2887 error
= dsl_dataset_hold(dp
, ddpa
->ddpa_clonename
, tag
,
2891 dd
= ddpa
->ddpa_clone
->ds_dir
;
2893 if (ddpa
->ddpa_clone
->ds_is_snapshot
||
2894 !dsl_dir_is_clone(dd
)) {
2895 dsl_dataset_rele(ddpa
->ddpa_clone
, tag
);
2896 return (SET_ERROR(EINVAL
));
2899 error
= snaplist_make(dp
, 0, dsl_dir_phys(dd
)->dd_origin_obj
,
2900 &ddpa
->shared_snaps
, tag
);
2904 error
= snaplist_make(dp
, 0, ddpa
->ddpa_clone
->ds_object
,
2905 &ddpa
->clone_snaps
, tag
);
2909 snap
= list_head(&ddpa
->shared_snaps
);
2910 ASSERT3U(snap
->ds
->ds_object
, ==, dsl_dir_phys(dd
)->dd_origin_obj
);
2911 error
= snaplist_make(dp
, dsl_dir_phys(dd
)->dd_origin_obj
,
2912 dsl_dir_phys(snap
->ds
->ds_dir
)->dd_head_dataset_obj
,
2913 &ddpa
->origin_snaps
, tag
);
2917 if (dsl_dir_phys(snap
->ds
->ds_dir
)->dd_origin_obj
!= 0) {
2918 error
= dsl_dataset_hold_obj(dp
,
2919 dsl_dir_phys(snap
->ds
->ds_dir
)->dd_origin_obj
,
2920 tag
, &ddpa
->origin_origin
);
2926 promote_rele(ddpa
, tag
);
2931 promote_rele(dsl_dataset_promote_arg_t
*ddpa
, void *tag
)
2933 snaplist_destroy(&ddpa
->shared_snaps
, tag
);
2934 snaplist_destroy(&ddpa
->clone_snaps
, tag
);
2935 snaplist_destroy(&ddpa
->origin_snaps
, tag
);
2936 if (ddpa
->origin_origin
!= NULL
)
2937 dsl_dataset_rele(ddpa
->origin_origin
, tag
);
2938 dsl_dataset_rele(ddpa
->ddpa_clone
, tag
);
2944 * If it fails due to a conflicting snapshot name, "conflsnap" will be filled
2945 * in with the name. (It must be at least ZFS_MAX_DATASET_NAME_LEN bytes long.)
2948 dsl_dataset_promote(const char *name
, char *conflsnap
)
2950 dsl_dataset_promote_arg_t ddpa
= { 0 };
2956 * We will modify space proportional to the number of
2957 * snapshots. Compute numsnaps.
2959 error
= dmu_objset_hold(name
, FTAG
, &os
);
2962 error
= zap_count(dmu_objset_pool(os
)->dp_meta_objset
,
2963 dsl_dataset_phys(dmu_objset_ds(os
))->ds_snapnames_zapobj
,
2965 dmu_objset_rele(os
, FTAG
);
2969 ddpa
.ddpa_clonename
= name
;
2970 ddpa
.err_ds
= conflsnap
;
2973 return (dsl_sync_task(name
, dsl_dataset_promote_check
,
2974 dsl_dataset_promote_sync
, &ddpa
,
2975 2 + numsnaps
, ZFS_SPACE_CHECK_RESERVED
));
2979 dsl_dataset_clone_swap_check_impl(dsl_dataset_t
*clone
,
2980 dsl_dataset_t
*origin_head
, boolean_t force
, void *owner
, dmu_tx_t
*tx
)
2983 * "slack" factor for received datasets with refquota set on them.
2984 * See the bottom of this function for details on its use.
2986 uint64_t refquota_slack
= (uint64_t)DMU_MAX_ACCESS
*
2987 spa_asize_inflation
;
2988 int64_t unused_refres_delta
;
2990 /* they should both be heads */
2991 if (clone
->ds_is_snapshot
||
2992 origin_head
->ds_is_snapshot
)
2993 return (SET_ERROR(EINVAL
));
2995 /* if we are not forcing, the branch point should be just before them */
2996 if (!force
&& clone
->ds_prev
!= origin_head
->ds_prev
)
2997 return (SET_ERROR(EINVAL
));
2999 /* clone should be the clone (unless they are unrelated) */
3000 if (clone
->ds_prev
!= NULL
&&
3001 clone
->ds_prev
!= clone
->ds_dir
->dd_pool
->dp_origin_snap
&&
3002 origin_head
->ds_dir
!= clone
->ds_prev
->ds_dir
)
3003 return (SET_ERROR(EINVAL
));
3005 /* the clone should be a child of the origin */
3006 if (clone
->ds_dir
->dd_parent
!= origin_head
->ds_dir
)
3007 return (SET_ERROR(EINVAL
));
3009 /* origin_head shouldn't be modified unless 'force' */
3011 dsl_dataset_modified_since_snap(origin_head
, origin_head
->ds_prev
))
3012 return (SET_ERROR(ETXTBSY
));
3014 /* origin_head should have no long holds (e.g. is not mounted) */
3015 if (dsl_dataset_handoff_check(origin_head
, owner
, tx
))
3016 return (SET_ERROR(EBUSY
));
3018 /* check amount of any unconsumed refreservation */
3019 unused_refres_delta
=
3020 (int64_t)MIN(origin_head
->ds_reserved
,
3021 dsl_dataset_phys(origin_head
)->ds_unique_bytes
) -
3022 (int64_t)MIN(origin_head
->ds_reserved
,
3023 dsl_dataset_phys(clone
)->ds_unique_bytes
);
3025 if (unused_refres_delta
> 0 &&
3026 unused_refres_delta
>
3027 dsl_dir_space_available(origin_head
->ds_dir
, NULL
, 0, TRUE
))
3028 return (SET_ERROR(ENOSPC
));
3031 * The clone can't be too much over the head's refquota.
3033 * To ensure that the entire refquota can be used, we allow one
3034 * transaction to exceed the the refquota. Therefore, this check
3035 * needs to also allow for the space referenced to be more than the
3036 * refquota. The maximum amount of space that one transaction can use
3037 * on disk is DMU_MAX_ACCESS * spa_asize_inflation. Allowing this
3038 * overage ensures that we are able to receive a filesystem that
3039 * exceeds the refquota on the source system.
3041 * So that overage is the refquota_slack we use below.
3043 if (origin_head
->ds_quota
!= 0 &&
3044 dsl_dataset_phys(clone
)->ds_referenced_bytes
>
3045 origin_head
->ds_quota
+ refquota_slack
)
3046 return (SET_ERROR(EDQUOT
));
3052 dsl_dataset_clone_swap_sync_impl(dsl_dataset_t
*clone
,
3053 dsl_dataset_t
*origin_head
, dmu_tx_t
*tx
)
3055 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
3056 int64_t unused_refres_delta
;
3058 ASSERT(clone
->ds_reserved
== 0);
3060 * NOTE: On DEBUG kernels there could be a race between this and
3061 * the check function if spa_asize_inflation is adjusted...
3063 ASSERT(origin_head
->ds_quota
== 0 ||
3064 dsl_dataset_phys(clone
)->ds_unique_bytes
<= origin_head
->ds_quota
+
3065 DMU_MAX_ACCESS
* spa_asize_inflation
);
3066 ASSERT3P(clone
->ds_prev
, ==, origin_head
->ds_prev
);
3069 * Swap per-dataset feature flags.
3071 for (spa_feature_t f
= 0; f
< SPA_FEATURES
; f
++) {
3072 if (!(spa_feature_table
[f
].fi_flags
&
3073 ZFEATURE_FLAG_PER_DATASET
)) {
3074 ASSERT(!clone
->ds_feature_inuse
[f
]);
3075 ASSERT(!origin_head
->ds_feature_inuse
[f
]);
3079 boolean_t clone_inuse
= clone
->ds_feature_inuse
[f
];
3080 boolean_t origin_head_inuse
= origin_head
->ds_feature_inuse
[f
];
3083 dsl_dataset_deactivate_feature(clone
->ds_object
, f
, tx
);
3084 clone
->ds_feature_inuse
[f
] = B_FALSE
;
3086 if (origin_head_inuse
) {
3087 dsl_dataset_deactivate_feature(origin_head
->ds_object
,
3089 origin_head
->ds_feature_inuse
[f
] = B_FALSE
;
3092 dsl_dataset_activate_feature(origin_head
->ds_object
,
3094 origin_head
->ds_feature_inuse
[f
] = B_TRUE
;
3096 if (origin_head_inuse
) {
3097 dsl_dataset_activate_feature(clone
->ds_object
, f
, tx
);
3098 clone
->ds_feature_inuse
[f
] = B_TRUE
;
3102 dmu_buf_will_dirty(clone
->ds_dbuf
, tx
);
3103 dmu_buf_will_dirty(origin_head
->ds_dbuf
, tx
);
3105 if (clone
->ds_objset
!= NULL
) {
3106 dmu_objset_evict(clone
->ds_objset
);
3107 clone
->ds_objset
= NULL
;
3110 if (origin_head
->ds_objset
!= NULL
) {
3111 dmu_objset_evict(origin_head
->ds_objset
);
3112 origin_head
->ds_objset
= NULL
;
3115 unused_refres_delta
=
3116 (int64_t)MIN(origin_head
->ds_reserved
,
3117 dsl_dataset_phys(origin_head
)->ds_unique_bytes
) -
3118 (int64_t)MIN(origin_head
->ds_reserved
,
3119 dsl_dataset_phys(clone
)->ds_unique_bytes
);
3122 * Reset origin's unique bytes, if it exists.
3124 if (clone
->ds_prev
) {
3125 dsl_dataset_t
*origin
= clone
->ds_prev
;
3126 uint64_t comp
, uncomp
;
3128 dmu_buf_will_dirty(origin
->ds_dbuf
, tx
);
3129 dsl_deadlist_space_range(&clone
->ds_deadlist
,
3130 dsl_dataset_phys(origin
)->ds_prev_snap_txg
, UINT64_MAX
,
3131 &dsl_dataset_phys(origin
)->ds_unique_bytes
, &comp
, &uncomp
);
3136 rrw_enter(&clone
->ds_bp_rwlock
, RW_WRITER
, FTAG
);
3137 rrw_enter(&origin_head
->ds_bp_rwlock
, RW_WRITER
, FTAG
);
3139 tmp
= dsl_dataset_phys(origin_head
)->ds_bp
;
3140 dsl_dataset_phys(origin_head
)->ds_bp
=
3141 dsl_dataset_phys(clone
)->ds_bp
;
3142 dsl_dataset_phys(clone
)->ds_bp
= tmp
;
3143 rrw_exit(&origin_head
->ds_bp_rwlock
, FTAG
);
3144 rrw_exit(&clone
->ds_bp_rwlock
, FTAG
);
3147 /* set dd_*_bytes */
3149 int64_t dused
, dcomp
, duncomp
;
3150 uint64_t cdl_used
, cdl_comp
, cdl_uncomp
;
3151 uint64_t odl_used
, odl_comp
, odl_uncomp
;
3153 ASSERT3U(dsl_dir_phys(clone
->ds_dir
)->
3154 dd_used_breakdown
[DD_USED_SNAP
], ==, 0);
3156 dsl_deadlist_space(&clone
->ds_deadlist
,
3157 &cdl_used
, &cdl_comp
, &cdl_uncomp
);
3158 dsl_deadlist_space(&origin_head
->ds_deadlist
,
3159 &odl_used
, &odl_comp
, &odl_uncomp
);
3161 dused
= dsl_dataset_phys(clone
)->ds_referenced_bytes
+
3163 (dsl_dataset_phys(origin_head
)->ds_referenced_bytes
+
3165 dcomp
= dsl_dataset_phys(clone
)->ds_compressed_bytes
+
3167 (dsl_dataset_phys(origin_head
)->ds_compressed_bytes
+
3169 duncomp
= dsl_dataset_phys(clone
)->ds_uncompressed_bytes
+
3171 (dsl_dataset_phys(origin_head
)->ds_uncompressed_bytes
+
3174 dsl_dir_diduse_space(origin_head
->ds_dir
, DD_USED_HEAD
,
3175 dused
, dcomp
, duncomp
, tx
);
3176 dsl_dir_diduse_space(clone
->ds_dir
, DD_USED_HEAD
,
3177 -dused
, -dcomp
, -duncomp
, tx
);
3180 * The difference in the space used by snapshots is the
3181 * difference in snapshot space due to the head's
3182 * deadlist (since that's the only thing that's
3183 * changing that affects the snapused).
3185 dsl_deadlist_space_range(&clone
->ds_deadlist
,
3186 origin_head
->ds_dir
->dd_origin_txg
, UINT64_MAX
,
3187 &cdl_used
, &cdl_comp
, &cdl_uncomp
);
3188 dsl_deadlist_space_range(&origin_head
->ds_deadlist
,
3189 origin_head
->ds_dir
->dd_origin_txg
, UINT64_MAX
,
3190 &odl_used
, &odl_comp
, &odl_uncomp
);
3191 dsl_dir_transfer_space(origin_head
->ds_dir
, cdl_used
- odl_used
,
3192 DD_USED_HEAD
, DD_USED_SNAP
, tx
);
3195 /* swap ds_*_bytes */
3196 SWITCH64(dsl_dataset_phys(origin_head
)->ds_referenced_bytes
,
3197 dsl_dataset_phys(clone
)->ds_referenced_bytes
);
3198 SWITCH64(dsl_dataset_phys(origin_head
)->ds_compressed_bytes
,
3199 dsl_dataset_phys(clone
)->ds_compressed_bytes
);
3200 SWITCH64(dsl_dataset_phys(origin_head
)->ds_uncompressed_bytes
,
3201 dsl_dataset_phys(clone
)->ds_uncompressed_bytes
);
3202 SWITCH64(dsl_dataset_phys(origin_head
)->ds_unique_bytes
,
3203 dsl_dataset_phys(clone
)->ds_unique_bytes
);
3205 /* apply any parent delta for change in unconsumed refreservation */
3206 dsl_dir_diduse_space(origin_head
->ds_dir
, DD_USED_REFRSRV
,
3207 unused_refres_delta
, 0, 0, tx
);
3212 dsl_deadlist_close(&clone
->ds_deadlist
);
3213 dsl_deadlist_close(&origin_head
->ds_deadlist
);
3214 SWITCH64(dsl_dataset_phys(origin_head
)->ds_deadlist_obj
,
3215 dsl_dataset_phys(clone
)->ds_deadlist_obj
);
3216 dsl_deadlist_open(&clone
->ds_deadlist
, dp
->dp_meta_objset
,
3217 dsl_dataset_phys(clone
)->ds_deadlist_obj
);
3218 dsl_deadlist_open(&origin_head
->ds_deadlist
, dp
->dp_meta_objset
,
3219 dsl_dataset_phys(origin_head
)->ds_deadlist_obj
);
3221 dsl_scan_ds_clone_swapped(origin_head
, clone
, tx
);
3223 spa_history_log_internal_ds(clone
, "clone swap", tx
,
3224 "parent=%s", origin_head
->ds_dir
->dd_myname
);
3228 * Given a pool name and a dataset object number in that pool,
3229 * return the name of that dataset.
3232 dsl_dsobj_to_dsname(char *pname
, uint64_t obj
, char *buf
)
3238 error
= dsl_pool_hold(pname
, FTAG
, &dp
);
3242 error
= dsl_dataset_hold_obj(dp
, obj
, FTAG
, &ds
);
3244 dsl_dataset_name(ds
, buf
);
3245 dsl_dataset_rele(ds
, FTAG
);
3247 dsl_pool_rele(dp
, FTAG
);
3253 dsl_dataset_check_quota(dsl_dataset_t
*ds
, boolean_t check_quota
,
3254 uint64_t asize
, uint64_t inflight
, uint64_t *used
, uint64_t *ref_rsrv
)
3258 ASSERT3S(asize
, >, 0);
3261 * *ref_rsrv is the portion of asize that will come from any
3262 * unconsumed refreservation space.
3266 mutex_enter(&ds
->ds_lock
);
3268 * Make a space adjustment for reserved bytes.
3270 if (ds
->ds_reserved
> dsl_dataset_phys(ds
)->ds_unique_bytes
) {
3272 ds
->ds_reserved
- dsl_dataset_phys(ds
)->ds_unique_bytes
);
3274 (ds
->ds_reserved
- dsl_dataset_phys(ds
)->ds_unique_bytes
);
3276 asize
- MIN(asize
, parent_delta(ds
, asize
+ inflight
));
3279 if (!check_quota
|| ds
->ds_quota
== 0) {
3280 mutex_exit(&ds
->ds_lock
);
3284 * If they are requesting more space, and our current estimate
3285 * is over quota, they get to try again unless the actual
3286 * on-disk is over quota and there are no pending changes (which
3287 * may free up space for us).
3289 if (dsl_dataset_phys(ds
)->ds_referenced_bytes
+ inflight
>=
3292 dsl_dataset_phys(ds
)->ds_referenced_bytes
< ds
->ds_quota
)
3293 error
= SET_ERROR(ERESTART
);
3295 error
= SET_ERROR(EDQUOT
);
3297 mutex_exit(&ds
->ds_lock
);
3302 typedef struct dsl_dataset_set_qr_arg
{
3303 const char *ddsqra_name
;
3304 zprop_source_t ddsqra_source
;
3305 uint64_t ddsqra_value
;
3306 } dsl_dataset_set_qr_arg_t
;
3311 dsl_dataset_set_refquota_check(void *arg
, dmu_tx_t
*tx
)
3313 dsl_dataset_set_qr_arg_t
*ddsqra
= arg
;
3314 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
3319 if (spa_version(dp
->dp_spa
) < SPA_VERSION_REFQUOTA
)
3320 return (SET_ERROR(ENOTSUP
));
3322 error
= dsl_dataset_hold(dp
, ddsqra
->ddsqra_name
, FTAG
, &ds
);
3326 if (ds
->ds_is_snapshot
) {
3327 dsl_dataset_rele(ds
, FTAG
);
3328 return (SET_ERROR(EINVAL
));
3331 error
= dsl_prop_predict(ds
->ds_dir
,
3332 zfs_prop_to_name(ZFS_PROP_REFQUOTA
),
3333 ddsqra
->ddsqra_source
, ddsqra
->ddsqra_value
, &newval
);
3335 dsl_dataset_rele(ds
, FTAG
);
3340 dsl_dataset_rele(ds
, FTAG
);
3344 if (newval
< dsl_dataset_phys(ds
)->ds_referenced_bytes
||
3345 newval
< ds
->ds_reserved
) {
3346 dsl_dataset_rele(ds
, FTAG
);
3347 return (SET_ERROR(ENOSPC
));
3350 dsl_dataset_rele(ds
, FTAG
);
3355 dsl_dataset_set_refquota_sync(void *arg
, dmu_tx_t
*tx
)
3357 dsl_dataset_set_qr_arg_t
*ddsqra
= arg
;
3358 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
3359 dsl_dataset_t
*ds
= NULL
;
3362 VERIFY0(dsl_dataset_hold(dp
, ddsqra
->ddsqra_name
, FTAG
, &ds
));
3364 dsl_prop_set_sync_impl(ds
,
3365 zfs_prop_to_name(ZFS_PROP_REFQUOTA
),
3366 ddsqra
->ddsqra_source
, sizeof (ddsqra
->ddsqra_value
), 1,
3367 &ddsqra
->ddsqra_value
, tx
);
3369 VERIFY0(dsl_prop_get_int_ds(ds
,
3370 zfs_prop_to_name(ZFS_PROP_REFQUOTA
), &newval
));
3372 if (ds
->ds_quota
!= newval
) {
3373 dmu_buf_will_dirty(ds
->ds_dbuf
, tx
);
3374 ds
->ds_quota
= newval
;
3376 dsl_dataset_rele(ds
, FTAG
);
3380 dsl_dataset_set_refquota(const char *dsname
, zprop_source_t source
,
3383 dsl_dataset_set_qr_arg_t ddsqra
;
3385 ddsqra
.ddsqra_name
= dsname
;
3386 ddsqra
.ddsqra_source
= source
;
3387 ddsqra
.ddsqra_value
= refquota
;
3389 return (dsl_sync_task(dsname
, dsl_dataset_set_refquota_check
,
3390 dsl_dataset_set_refquota_sync
, &ddsqra
, 0, ZFS_SPACE_CHECK_NONE
));
3394 dsl_dataset_set_refreservation_check(void *arg
, dmu_tx_t
*tx
)
3396 dsl_dataset_set_qr_arg_t
*ddsqra
= arg
;
3397 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
3400 uint64_t newval
, unique
;
3402 if (spa_version(dp
->dp_spa
) < SPA_VERSION_REFRESERVATION
)
3403 return (SET_ERROR(ENOTSUP
));
3405 error
= dsl_dataset_hold(dp
, ddsqra
->ddsqra_name
, FTAG
, &ds
);
3409 if (ds
->ds_is_snapshot
) {
3410 dsl_dataset_rele(ds
, FTAG
);
3411 return (SET_ERROR(EINVAL
));
3414 error
= dsl_prop_predict(ds
->ds_dir
,
3415 zfs_prop_to_name(ZFS_PROP_REFRESERVATION
),
3416 ddsqra
->ddsqra_source
, ddsqra
->ddsqra_value
, &newval
);
3418 dsl_dataset_rele(ds
, FTAG
);
3423 * If we are doing the preliminary check in open context, the
3424 * space estimates may be inaccurate.
3426 if (!dmu_tx_is_syncing(tx
)) {
3427 dsl_dataset_rele(ds
, FTAG
);
3431 mutex_enter(&ds
->ds_lock
);
3432 if (!DS_UNIQUE_IS_ACCURATE(ds
))
3433 dsl_dataset_recalc_head_uniq(ds
);
3434 unique
= dsl_dataset_phys(ds
)->ds_unique_bytes
;
3435 mutex_exit(&ds
->ds_lock
);
3437 if (MAX(unique
, newval
) > MAX(unique
, ds
->ds_reserved
)) {
3438 uint64_t delta
= MAX(unique
, newval
) -
3439 MAX(unique
, ds
->ds_reserved
);
3442 dsl_dir_space_available(ds
->ds_dir
, NULL
, 0, B_TRUE
) ||
3443 (ds
->ds_quota
> 0 && newval
> ds
->ds_quota
)) {
3444 dsl_dataset_rele(ds
, FTAG
);
3445 return (SET_ERROR(ENOSPC
));
3449 dsl_dataset_rele(ds
, FTAG
);
3454 dsl_dataset_set_refreservation_sync_impl(dsl_dataset_t
*ds
,
3455 zprop_source_t source
, uint64_t value
, dmu_tx_t
*tx
)
3461 dsl_prop_set_sync_impl(ds
, zfs_prop_to_name(ZFS_PROP_REFRESERVATION
),
3462 source
, sizeof (value
), 1, &value
, tx
);
3464 VERIFY0(dsl_prop_get_int_ds(ds
,
3465 zfs_prop_to_name(ZFS_PROP_REFRESERVATION
), &newval
));
3467 dmu_buf_will_dirty(ds
->ds_dbuf
, tx
);
3468 mutex_enter(&ds
->ds_dir
->dd_lock
);
3469 mutex_enter(&ds
->ds_lock
);
3470 ASSERT(DS_UNIQUE_IS_ACCURATE(ds
));
3471 unique
= dsl_dataset_phys(ds
)->ds_unique_bytes
;
3472 delta
= MAX(0, (int64_t)(newval
- unique
)) -
3473 MAX(0, (int64_t)(ds
->ds_reserved
- unique
));
3474 ds
->ds_reserved
= newval
;
3475 mutex_exit(&ds
->ds_lock
);
3477 dsl_dir_diduse_space(ds
->ds_dir
, DD_USED_REFRSRV
, delta
, 0, 0, tx
);
3478 mutex_exit(&ds
->ds_dir
->dd_lock
);
3482 dsl_dataset_set_refreservation_sync(void *arg
, dmu_tx_t
*tx
)
3484 dsl_dataset_set_qr_arg_t
*ddsqra
= arg
;
3485 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
3486 dsl_dataset_t
*ds
= NULL
;
3488 VERIFY0(dsl_dataset_hold(dp
, ddsqra
->ddsqra_name
, FTAG
, &ds
));
3489 dsl_dataset_set_refreservation_sync_impl(ds
,
3490 ddsqra
->ddsqra_source
, ddsqra
->ddsqra_value
, tx
);
3491 dsl_dataset_rele(ds
, FTAG
);
3495 dsl_dataset_set_refreservation(const char *dsname
, zprop_source_t source
,
3496 uint64_t refreservation
)
3498 dsl_dataset_set_qr_arg_t ddsqra
;
3500 ddsqra
.ddsqra_name
= dsname
;
3501 ddsqra
.ddsqra_source
= source
;
3502 ddsqra
.ddsqra_value
= refreservation
;
3504 return (dsl_sync_task(dsname
, dsl_dataset_set_refreservation_check
,
3505 dsl_dataset_set_refreservation_sync
, &ddsqra
,
3506 0, ZFS_SPACE_CHECK_NONE
));
3510 * Return (in *usedp) the amount of space written in new that is not
3511 * present in oldsnap. New may be a snapshot or the head. Old must be
3512 * a snapshot before new, in new's filesystem (or its origin). If not then
3513 * fail and return EINVAL.
3515 * The written space is calculated by considering two components: First, we
3516 * ignore any freed space, and calculate the written as new's used space
3517 * minus old's used space. Next, we add in the amount of space that was freed
3518 * between the two snapshots, thus reducing new's used space relative to old's.
3519 * Specifically, this is the space that was born before old->ds_creation_txg,
3520 * and freed before new (ie. on new's deadlist or a previous deadlist).
3522 * space freed [---------------------]
3523 * snapshots ---O-------O--------O-------O------
3527 dsl_dataset_space_written(dsl_dataset_t
*oldsnap
, dsl_dataset_t
*new,
3528 uint64_t *usedp
, uint64_t *compp
, uint64_t *uncompp
)
3532 dsl_pool_t
*dp
= new->ds_dir
->dd_pool
;
3534 ASSERT(dsl_pool_config_held(dp
));
3537 *usedp
+= dsl_dataset_phys(new)->ds_referenced_bytes
;
3538 *usedp
-= dsl_dataset_phys(oldsnap
)->ds_referenced_bytes
;
3541 *compp
+= dsl_dataset_phys(new)->ds_compressed_bytes
;
3542 *compp
-= dsl_dataset_phys(oldsnap
)->ds_compressed_bytes
;
3545 *uncompp
+= dsl_dataset_phys(new)->ds_uncompressed_bytes
;
3546 *uncompp
-= dsl_dataset_phys(oldsnap
)->ds_uncompressed_bytes
;
3548 snapobj
= new->ds_object
;
3549 while (snapobj
!= oldsnap
->ds_object
) {
3550 dsl_dataset_t
*snap
;
3551 uint64_t used
, comp
, uncomp
;
3553 if (snapobj
== new->ds_object
) {
3556 err
= dsl_dataset_hold_obj(dp
, snapobj
, FTAG
, &snap
);
3561 if (dsl_dataset_phys(snap
)->ds_prev_snap_txg
==
3562 dsl_dataset_phys(oldsnap
)->ds_creation_txg
) {
3564 * The blocks in the deadlist can not be born after
3565 * ds_prev_snap_txg, so get the whole deadlist space,
3566 * which is more efficient (especially for old-format
3567 * deadlists). Unfortunately the deadlist code
3568 * doesn't have enough information to make this
3569 * optimization itself.
3571 dsl_deadlist_space(&snap
->ds_deadlist
,
3572 &used
, &comp
, &uncomp
);
3574 dsl_deadlist_space_range(&snap
->ds_deadlist
,
3575 0, dsl_dataset_phys(oldsnap
)->ds_creation_txg
,
3576 &used
, &comp
, &uncomp
);
3583 * If we get to the beginning of the chain of snapshots
3584 * (ds_prev_snap_obj == 0) before oldsnap, then oldsnap
3585 * was not a snapshot of/before new.
3587 snapobj
= dsl_dataset_phys(snap
)->ds_prev_snap_obj
;
3589 dsl_dataset_rele(snap
, FTAG
);
3591 err
= SET_ERROR(EINVAL
);
3600 * Return (in *usedp) the amount of space that will be reclaimed if firstsnap,
3601 * lastsnap, and all snapshots in between are deleted.
3603 * blocks that would be freed [---------------------------]
3604 * snapshots ---O-------O--------O-------O--------O
3605 * firstsnap lastsnap
3607 * This is the set of blocks that were born after the snap before firstsnap,
3608 * (birth > firstsnap->prev_snap_txg) and died before the snap after the
3609 * last snap (ie, is on lastsnap->ds_next->ds_deadlist or an earlier deadlist).
3610 * We calculate this by iterating over the relevant deadlists (from the snap
3611 * after lastsnap, backward to the snap after firstsnap), summing up the
3612 * space on the deadlist that was born after the snap before firstsnap.
3615 dsl_dataset_space_wouldfree(dsl_dataset_t
*firstsnap
,
3616 dsl_dataset_t
*lastsnap
,
3617 uint64_t *usedp
, uint64_t *compp
, uint64_t *uncompp
)
3621 dsl_pool_t
*dp
= firstsnap
->ds_dir
->dd_pool
;
3623 ASSERT(firstsnap
->ds_is_snapshot
);
3624 ASSERT(lastsnap
->ds_is_snapshot
);
3627 * Check that the snapshots are in the same dsl_dir, and firstsnap
3628 * is before lastsnap.
3630 if (firstsnap
->ds_dir
!= lastsnap
->ds_dir
||
3631 dsl_dataset_phys(firstsnap
)->ds_creation_txg
>
3632 dsl_dataset_phys(lastsnap
)->ds_creation_txg
)
3633 return (SET_ERROR(EINVAL
));
3635 *usedp
= *compp
= *uncompp
= 0;
3637 snapobj
= dsl_dataset_phys(lastsnap
)->ds_next_snap_obj
;
3638 while (snapobj
!= firstsnap
->ds_object
) {
3640 uint64_t used
, comp
, uncomp
;
3642 err
= dsl_dataset_hold_obj(dp
, snapobj
, FTAG
, &ds
);
3646 dsl_deadlist_space_range(&ds
->ds_deadlist
,
3647 dsl_dataset_phys(firstsnap
)->ds_prev_snap_txg
, UINT64_MAX
,
3648 &used
, &comp
, &uncomp
);
3653 snapobj
= dsl_dataset_phys(ds
)->ds_prev_snap_obj
;
3654 ASSERT3U(snapobj
, !=, 0);
3655 dsl_dataset_rele(ds
, FTAG
);
3661 * Return TRUE if 'earlier' is an earlier snapshot in 'later's timeline.
3662 * For example, they could both be snapshots of the same filesystem, and
3663 * 'earlier' is before 'later'. Or 'earlier' could be the origin of
3664 * 'later's filesystem. Or 'earlier' could be an older snapshot in the origin's
3665 * filesystem. Or 'earlier' could be the origin's origin.
3667 * If non-zero, earlier_txg is used instead of earlier's ds_creation_txg.
3670 dsl_dataset_is_before(dsl_dataset_t
*later
, dsl_dataset_t
*earlier
,
3671 uint64_t earlier_txg
)
3673 dsl_pool_t
*dp
= later
->ds_dir
->dd_pool
;
3677 ASSERT(dsl_pool_config_held(dp
));
3678 ASSERT(earlier
->ds_is_snapshot
|| earlier_txg
!= 0);
3680 if (earlier_txg
== 0)
3681 earlier_txg
= dsl_dataset_phys(earlier
)->ds_creation_txg
;
3683 if (later
->ds_is_snapshot
&&
3684 earlier_txg
>= dsl_dataset_phys(later
)->ds_creation_txg
)
3687 if (later
->ds_dir
== earlier
->ds_dir
)
3689 if (!dsl_dir_is_clone(later
->ds_dir
))
3692 if (dsl_dir_phys(later
->ds_dir
)->dd_origin_obj
== earlier
->ds_object
)
3694 dsl_dataset_t
*origin
;
3695 error
= dsl_dataset_hold_obj(dp
,
3696 dsl_dir_phys(later
->ds_dir
)->dd_origin_obj
, FTAG
, &origin
);
3699 ret
= dsl_dataset_is_before(origin
, earlier
, earlier_txg
);
3700 dsl_dataset_rele(origin
, FTAG
);
3705 dsl_dataset_zapify(dsl_dataset_t
*ds
, dmu_tx_t
*tx
)
3707 objset_t
*mos
= ds
->ds_dir
->dd_pool
->dp_meta_objset
;
3708 dmu_object_zapify(mos
, ds
->ds_object
, DMU_OT_DSL_DATASET
, tx
);
3712 dsl_dataset_is_zapified(dsl_dataset_t
*ds
)
3714 dmu_object_info_t doi
;
3716 dmu_object_info_from_db(ds
->ds_dbuf
, &doi
);
3717 return (doi
.doi_type
== DMU_OTN_ZAP_METADATA
);
3721 dsl_dataset_has_resume_receive_state(dsl_dataset_t
*ds
)
3723 return (dsl_dataset_is_zapified(ds
) &&
3724 zap_contains(ds
->ds_dir
->dd_pool
->dp_meta_objset
,
3725 ds
->ds_object
, DS_FIELD_RESUME_TOGUID
) == 0);
3728 #if defined(_KERNEL) && defined(HAVE_SPL)
3730 module_param(zfs_max_recordsize
, int, 0644);
3731 MODULE_PARM_DESC(zfs_max_recordsize
, "Max allowed record size");
3733 /* Limited to 1M on 32-bit platforms due to lack of virtual address space */
3734 module_param(zfs_max_recordsize
, int, 0444);
3735 MODULE_PARM_DESC(zfs_max_recordsize
, "Max allowed record size");
3738 EXPORT_SYMBOL(dsl_dataset_hold
);
3739 EXPORT_SYMBOL(dsl_dataset_hold_flags
);
3740 EXPORT_SYMBOL(dsl_dataset_hold_obj
);
3741 EXPORT_SYMBOL(dsl_dataset_hold_obj_flags
);
3742 EXPORT_SYMBOL(dsl_dataset_own
);
3743 EXPORT_SYMBOL(dsl_dataset_own_obj
);
3744 EXPORT_SYMBOL(dsl_dataset_name
);
3745 EXPORT_SYMBOL(dsl_dataset_rele
);
3746 EXPORT_SYMBOL(dsl_dataset_rele_flags
);
3747 EXPORT_SYMBOL(dsl_dataset_disown
);
3748 EXPORT_SYMBOL(dsl_dataset_tryown
);
3749 EXPORT_SYMBOL(dsl_dataset_create_sync
);
3750 EXPORT_SYMBOL(dsl_dataset_create_sync_dd
);
3751 EXPORT_SYMBOL(dsl_dataset_snapshot_check
);
3752 EXPORT_SYMBOL(dsl_dataset_snapshot_sync
);
3753 EXPORT_SYMBOL(dsl_dataset_promote
);
3754 EXPORT_SYMBOL(dsl_dataset_user_hold
);
3755 EXPORT_SYMBOL(dsl_dataset_user_release
);
3756 EXPORT_SYMBOL(dsl_dataset_get_holds
);
3757 EXPORT_SYMBOL(dsl_dataset_get_blkptr
);
3758 EXPORT_SYMBOL(dsl_dataset_get_spa
);
3759 EXPORT_SYMBOL(dsl_dataset_modified_since_snap
);
3760 EXPORT_SYMBOL(dsl_dataset_space_written
);
3761 EXPORT_SYMBOL(dsl_dataset_space_wouldfree
);
3762 EXPORT_SYMBOL(dsl_dataset_sync
);
3763 EXPORT_SYMBOL(dsl_dataset_block_born
);
3764 EXPORT_SYMBOL(dsl_dataset_block_kill
);
3765 EXPORT_SYMBOL(dsl_dataset_dirty
);
3766 EXPORT_SYMBOL(dsl_dataset_stats
);
3767 EXPORT_SYMBOL(dsl_dataset_fast_stat
);
3768 EXPORT_SYMBOL(dsl_dataset_space
);
3769 EXPORT_SYMBOL(dsl_dataset_fsid_guid
);
3770 EXPORT_SYMBOL(dsl_dsobj_to_dsname
);
3771 EXPORT_SYMBOL(dsl_dataset_check_quota
);
3772 EXPORT_SYMBOL(dsl_dataset_clone_swap_check_impl
);
3773 EXPORT_SYMBOL(dsl_dataset_clone_swap_sync_impl
);