4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
22 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
23 * Copyright (c) 2013 by Delphix. All rights reserved.
24 * Copyright (c) 2014, Joyent, Inc. All rights reserved.
25 * Copyright (c) 2014 RackTop Systems.
28 #include <sys/dmu_objset.h>
29 #include <sys/dsl_dataset.h>
30 #include <sys/dsl_dir.h>
31 #include <sys/dsl_prop.h>
32 #include <sys/dsl_synctask.h>
33 #include <sys/dmu_traverse.h>
34 #include <sys/dmu_impl.h>
35 #include <sys/dmu_tx.h>
39 #include <sys/zfeature.h>
40 #include <sys/unique.h>
41 #include <sys/zfs_context.h>
42 #include <sys/zfs_ioctl.h>
44 #include <sys/zfs_znode.h>
45 #include <sys/zfs_onexit.h>
47 #include <sys/dsl_scan.h>
48 #include <sys/dsl_deadlist.h>
49 #include <sys/dsl_destroy.h>
50 #include <sys/dsl_userhold.h>
51 #include <sys/dsl_bookmark.h>
53 #define SWITCH64(x, y) \
55 uint64_t __tmp = (x); \
60 #define DS_REF_MAX (1ULL << 62)
62 #define DSL_DEADLIST_BLOCKSIZE SPA_MAXBLOCKSIZE
64 extern inline dsl_dataset_phys_t
*dsl_dataset_phys(dsl_dataset_t
*ds
);
65 extern inline boolean_t
dsl_dataset_is_snapshot(dsl_dataset_t
*ds
);
68 * Figure out how much of this delta should be propogated to the dsl_dir
69 * layer. If there's a refreservation, that space has already been
70 * partially accounted for in our ancestors.
73 parent_delta(dsl_dataset_t
*ds
, int64_t delta
)
75 dsl_dataset_phys_t
*ds_phys
;
76 uint64_t old_bytes
, new_bytes
;
78 if (ds
->ds_reserved
== 0)
81 ds_phys
= dsl_dataset_phys(ds
);
82 old_bytes
= MAX(ds_phys
->ds_unique_bytes
, ds
->ds_reserved
);
83 new_bytes
= MAX(ds_phys
->ds_unique_bytes
+ delta
, ds
->ds_reserved
);
85 ASSERT3U(ABS((int64_t)(new_bytes
- old_bytes
)), <=, ABS(delta
));
86 return (new_bytes
- old_bytes
);
90 dsl_dataset_block_born(dsl_dataset_t
*ds
, const blkptr_t
*bp
, dmu_tx_t
*tx
)
92 int used
, compressed
, uncompressed
;
95 used
= bp_get_dsize_sync(tx
->tx_pool
->dp_spa
, bp
);
96 compressed
= BP_GET_PSIZE(bp
);
97 uncompressed
= BP_GET_UCSIZE(bp
);
99 dprintf_bp(bp
, "ds=%p", ds
);
101 ASSERT(dmu_tx_is_syncing(tx
));
102 /* It could have been compressed away to nothing */
105 ASSERT(BP_GET_TYPE(bp
) != DMU_OT_NONE
);
106 ASSERT(DMU_OT_IS_VALID(BP_GET_TYPE(bp
)));
108 dsl_pool_mos_diduse_space(tx
->tx_pool
,
109 used
, compressed
, uncompressed
);
113 dmu_buf_will_dirty(ds
->ds_dbuf
, tx
);
114 mutex_enter(&ds
->ds_lock
);
115 delta
= parent_delta(ds
, used
);
116 dsl_dataset_phys(ds
)->ds_referenced_bytes
+= used
;
117 dsl_dataset_phys(ds
)->ds_compressed_bytes
+= compressed
;
118 dsl_dataset_phys(ds
)->ds_uncompressed_bytes
+= uncompressed
;
119 dsl_dataset_phys(ds
)->ds_unique_bytes
+= used
;
120 mutex_exit(&ds
->ds_lock
);
121 dsl_dir_diduse_space(ds
->ds_dir
, DD_USED_HEAD
, delta
,
122 compressed
, uncompressed
, tx
);
123 dsl_dir_transfer_space(ds
->ds_dir
, used
- delta
,
124 DD_USED_REFRSRV
, DD_USED_HEAD
, tx
);
128 dsl_dataset_block_kill(dsl_dataset_t
*ds
, const blkptr_t
*bp
, dmu_tx_t
*tx
,
131 int used
= bp_get_dsize_sync(tx
->tx_pool
->dp_spa
, bp
);
132 int compressed
= BP_GET_PSIZE(bp
);
133 int uncompressed
= BP_GET_UCSIZE(bp
);
138 ASSERT(dmu_tx_is_syncing(tx
));
139 ASSERT(bp
->blk_birth
<= tx
->tx_txg
);
142 dsl_free(tx
->tx_pool
, tx
->tx_txg
, bp
);
143 dsl_pool_mos_diduse_space(tx
->tx_pool
,
144 -used
, -compressed
, -uncompressed
);
147 ASSERT3P(tx
->tx_pool
, ==, ds
->ds_dir
->dd_pool
);
149 ASSERT(!dsl_dataset_is_snapshot(ds
));
150 dmu_buf_will_dirty(ds
->ds_dbuf
, tx
);
152 if (bp
->blk_birth
> dsl_dataset_phys(ds
)->ds_prev_snap_txg
) {
155 dprintf_bp(bp
, "freeing ds=%llu", ds
->ds_object
);
156 dsl_free(tx
->tx_pool
, tx
->tx_txg
, bp
);
158 mutex_enter(&ds
->ds_lock
);
159 ASSERT(dsl_dataset_phys(ds
)->ds_unique_bytes
>= used
||
160 !DS_UNIQUE_IS_ACCURATE(ds
));
161 delta
= parent_delta(ds
, -used
);
162 dsl_dataset_phys(ds
)->ds_unique_bytes
-= used
;
163 mutex_exit(&ds
->ds_lock
);
164 dsl_dir_diduse_space(ds
->ds_dir
, DD_USED_HEAD
,
165 delta
, -compressed
, -uncompressed
, tx
);
166 dsl_dir_transfer_space(ds
->ds_dir
, -used
- delta
,
167 DD_USED_REFRSRV
, DD_USED_HEAD
, tx
);
169 dprintf_bp(bp
, "putting on dead list: %s", "");
172 * We are here as part of zio's write done callback,
173 * which means we're a zio interrupt thread. We can't
174 * call dsl_deadlist_insert() now because it may block
175 * waiting for I/O. Instead, put bp on the deferred
176 * queue and let dsl_pool_sync() finish the job.
178 bplist_append(&ds
->ds_pending_deadlist
, bp
);
180 dsl_deadlist_insert(&ds
->ds_deadlist
, bp
, tx
);
182 ASSERT3U(ds
->ds_prev
->ds_object
, ==,
183 dsl_dataset_phys(ds
)->ds_prev_snap_obj
);
184 ASSERT(dsl_dataset_phys(ds
->ds_prev
)->ds_num_children
> 0);
185 /* if (bp->blk_birth > prev prev snap txg) prev unique += bs */
186 if (dsl_dataset_phys(ds
->ds_prev
)->ds_next_snap_obj
==
187 ds
->ds_object
&& bp
->blk_birth
>
188 dsl_dataset_phys(ds
->ds_prev
)->ds_prev_snap_txg
) {
189 dmu_buf_will_dirty(ds
->ds_prev
->ds_dbuf
, tx
);
190 mutex_enter(&ds
->ds_prev
->ds_lock
);
191 dsl_dataset_phys(ds
->ds_prev
)->ds_unique_bytes
+= used
;
192 mutex_exit(&ds
->ds_prev
->ds_lock
);
194 if (bp
->blk_birth
> ds
->ds_dir
->dd_origin_txg
) {
195 dsl_dir_transfer_space(ds
->ds_dir
, used
,
196 DD_USED_HEAD
, DD_USED_SNAP
, tx
);
199 mutex_enter(&ds
->ds_lock
);
200 ASSERT3U(dsl_dataset_phys(ds
)->ds_referenced_bytes
, >=, used
);
201 dsl_dataset_phys(ds
)->ds_referenced_bytes
-= used
;
202 ASSERT3U(dsl_dataset_phys(ds
)->ds_compressed_bytes
, >=, compressed
);
203 dsl_dataset_phys(ds
)->ds_compressed_bytes
-= compressed
;
204 ASSERT3U(dsl_dataset_phys(ds
)->ds_uncompressed_bytes
, >=, uncompressed
);
205 dsl_dataset_phys(ds
)->ds_uncompressed_bytes
-= uncompressed
;
206 mutex_exit(&ds
->ds_lock
);
212 dsl_dataset_prev_snap_txg(dsl_dataset_t
*ds
)
214 uint64_t trysnap
= 0;
219 * The snapshot creation could fail, but that would cause an
220 * incorrect FALSE return, which would only result in an
221 * overestimation of the amount of space that an operation would
222 * consume, which is OK.
224 * There's also a small window where we could miss a pending
225 * snapshot, because we could set the sync task in the quiescing
226 * phase. So this should only be used as a guess.
228 if (ds
->ds_trysnap_txg
>
229 spa_last_synced_txg(ds
->ds_dir
->dd_pool
->dp_spa
))
230 trysnap
= ds
->ds_trysnap_txg
;
231 return (MAX(dsl_dataset_phys(ds
)->ds_prev_snap_txg
, trysnap
));
235 dsl_dataset_block_freeable(dsl_dataset_t
*ds
, const blkptr_t
*bp
,
238 if (blk_birth
<= dsl_dataset_prev_snap_txg(ds
) ||
239 (bp
!= NULL
&& BP_IS_HOLE(bp
)))
242 ddt_prefetch(dsl_dataset_get_spa(ds
), bp
);
249 dsl_dataset_evict(dmu_buf_t
*db
, void *dsv
)
251 dsl_dataset_t
*ds
= dsv
;
253 ASSERT(ds
->ds_owner
== NULL
);
255 unique_remove(ds
->ds_fsid_guid
);
257 if (ds
->ds_objset
!= NULL
)
258 dmu_objset_evict(ds
->ds_objset
);
261 dsl_dataset_rele(ds
->ds_prev
, ds
);
265 bplist_destroy(&ds
->ds_pending_deadlist
);
266 if (dsl_dataset_phys(ds
)->ds_deadlist_obj
!= 0)
267 dsl_deadlist_close(&ds
->ds_deadlist
);
269 dsl_dir_rele(ds
->ds_dir
, ds
);
271 ASSERT(!list_link_active(&ds
->ds_synced_link
));
273 mutex_destroy(&ds
->ds_lock
);
274 mutex_destroy(&ds
->ds_opening_lock
);
275 mutex_destroy(&ds
->ds_sendstream_lock
);
276 refcount_destroy(&ds
->ds_longholds
);
278 kmem_free(ds
, sizeof (dsl_dataset_t
));
282 dsl_dataset_get_snapname(dsl_dataset_t
*ds
)
284 dsl_dataset_phys_t
*headphys
;
287 dsl_pool_t
*dp
= ds
->ds_dir
->dd_pool
;
288 objset_t
*mos
= dp
->dp_meta_objset
;
290 if (ds
->ds_snapname
[0])
292 if (dsl_dataset_phys(ds
)->ds_next_snap_obj
== 0)
295 err
= dmu_bonus_hold(mos
, dsl_dir_phys(ds
->ds_dir
)->dd_head_dataset_obj
,
299 headphys
= headdbuf
->db_data
;
300 err
= zap_value_search(dp
->dp_meta_objset
,
301 headphys
->ds_snapnames_zapobj
, ds
->ds_object
, 0, ds
->ds_snapname
);
302 dmu_buf_rele(headdbuf
, FTAG
);
307 dsl_dataset_snap_lookup(dsl_dataset_t
*ds
, const char *name
, uint64_t *value
)
309 objset_t
*mos
= ds
->ds_dir
->dd_pool
->dp_meta_objset
;
310 uint64_t snapobj
= dsl_dataset_phys(ds
)->ds_snapnames_zapobj
;
314 if (dsl_dataset_phys(ds
)->ds_flags
& DS_FLAG_CI_DATASET
)
319 err
= zap_lookup_norm(mos
, snapobj
, name
, 8, 1,
320 value
, mt
, NULL
, 0, NULL
);
321 if (err
== ENOTSUP
&& mt
== MT_FIRST
)
322 err
= zap_lookup(mos
, snapobj
, name
, 8, 1, value
);
327 dsl_dataset_snap_remove(dsl_dataset_t
*ds
, const char *name
, dmu_tx_t
*tx
,
330 objset_t
*mos
= ds
->ds_dir
->dd_pool
->dp_meta_objset
;
331 uint64_t snapobj
= dsl_dataset_phys(ds
)->ds_snapnames_zapobj
;
335 dsl_dir_snap_cmtime_update(ds
->ds_dir
);
337 if (dsl_dataset_phys(ds
)->ds_flags
& DS_FLAG_CI_DATASET
)
342 err
= zap_remove_norm(mos
, snapobj
, name
, mt
, tx
);
343 if (err
== ENOTSUP
&& mt
== MT_FIRST
)
344 err
= zap_remove(mos
, snapobj
, name
, tx
);
346 if (err
== 0 && adj_cnt
)
347 dsl_fs_ss_count_adjust(ds
->ds_dir
, -1,
348 DD_FIELD_SNAPSHOT_COUNT
, tx
);
354 dsl_dataset_hold_obj(dsl_pool_t
*dp
, uint64_t dsobj
, void *tag
,
357 objset_t
*mos
= dp
->dp_meta_objset
;
361 dmu_object_info_t doi
;
363 ASSERT(dsl_pool_config_held(dp
));
365 err
= dmu_bonus_hold(mos
, dsobj
, tag
, &dbuf
);
369 /* Make sure dsobj has the correct object type. */
370 dmu_object_info_from_db(dbuf
, &doi
);
371 if (doi
.doi_bonus_type
!= DMU_OT_DSL_DATASET
) {
372 dmu_buf_rele(dbuf
, tag
);
373 return (SET_ERROR(EINVAL
));
376 ds
= dmu_buf_get_user(dbuf
);
378 dsl_dataset_t
*winner
= NULL
;
380 ds
= kmem_zalloc(sizeof (dsl_dataset_t
), KM_SLEEP
);
382 ds
->ds_object
= dsobj
;
383 list_link_init(&ds
->ds_synced_link
);
385 mutex_init(&ds
->ds_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
386 mutex_init(&ds
->ds_opening_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
387 mutex_init(&ds
->ds_sendstream_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
388 refcount_create(&ds
->ds_longholds
);
390 bplist_create(&ds
->ds_pending_deadlist
);
391 dsl_deadlist_open(&ds
->ds_deadlist
,
392 mos
, dsl_dataset_phys(ds
)->ds_deadlist_obj
);
394 list_create(&ds
->ds_sendstreams
, sizeof (dmu_sendarg_t
),
395 offsetof(dmu_sendarg_t
, dsa_link
));
398 err
= dsl_dir_hold_obj(dp
,
399 dsl_dataset_phys(ds
)->ds_dir_obj
, NULL
, ds
,
403 mutex_destroy(&ds
->ds_lock
);
404 mutex_destroy(&ds
->ds_opening_lock
);
405 mutex_destroy(&ds
->ds_sendstream_lock
);
406 refcount_destroy(&ds
->ds_longholds
);
407 bplist_destroy(&ds
->ds_pending_deadlist
);
408 dsl_deadlist_close(&ds
->ds_deadlist
);
409 kmem_free(ds
, sizeof (dsl_dataset_t
));
410 dmu_buf_rele(dbuf
, tag
);
414 if (!dsl_dataset_is_snapshot(ds
)) {
415 ds
->ds_snapname
[0] = '\0';
416 if (dsl_dataset_phys(ds
)->ds_prev_snap_obj
!= 0) {
417 err
= dsl_dataset_hold_obj(dp
,
418 dsl_dataset_phys(ds
)->ds_prev_snap_obj
,
421 if (doi
.doi_type
== DMU_OTN_ZAP_METADATA
) {
422 int zaperr
= zap_lookup(mos
, ds
->ds_object
,
423 DS_FIELD_BOOKMARK_NAMES
,
424 sizeof (ds
->ds_bookmarks
), 1,
426 if (zaperr
!= ENOENT
)
430 if (zfs_flags
& ZFS_DEBUG_SNAPNAMES
)
431 err
= dsl_dataset_get_snapname(ds
);
433 dsl_dataset_phys(ds
)->ds_userrefs_obj
!= 0) {
435 ds
->ds_dir
->dd_pool
->dp_meta_objset
,
436 dsl_dataset_phys(ds
)->ds_userrefs_obj
,
441 if (err
== 0 && !dsl_dataset_is_snapshot(ds
)) {
442 err
= dsl_prop_get_int_ds(ds
,
443 zfs_prop_to_name(ZFS_PROP_REFRESERVATION
),
446 err
= dsl_prop_get_int_ds(ds
,
447 zfs_prop_to_name(ZFS_PROP_REFQUOTA
),
451 ds
->ds_reserved
= ds
->ds_quota
= 0;
454 if (err
!= 0 || (winner
= dmu_buf_set_user_ie(dbuf
, ds
,
455 dsl_dataset_evict
)) != NULL
) {
456 bplist_destroy(&ds
->ds_pending_deadlist
);
457 dsl_deadlist_close(&ds
->ds_deadlist
);
459 dsl_dataset_rele(ds
->ds_prev
, ds
);
460 dsl_dir_rele(ds
->ds_dir
, ds
);
461 mutex_destroy(&ds
->ds_lock
);
462 mutex_destroy(&ds
->ds_opening_lock
);
463 mutex_destroy(&ds
->ds_sendstream_lock
);
464 refcount_destroy(&ds
->ds_longholds
);
465 kmem_free(ds
, sizeof (dsl_dataset_t
));
467 dmu_buf_rele(dbuf
, tag
);
473 unique_insert(dsl_dataset_phys(ds
)->ds_fsid_guid
);
476 ASSERT3P(ds
->ds_dbuf
, ==, dbuf
);
477 ASSERT3P(dsl_dataset_phys(ds
), ==, dbuf
->db_data
);
478 ASSERT(dsl_dataset_phys(ds
)->ds_prev_snap_obj
!= 0 ||
479 spa_version(dp
->dp_spa
) < SPA_VERSION_ORIGIN
||
480 dp
->dp_origin_snap
== NULL
|| ds
== dp
->dp_origin_snap
);
486 dsl_dataset_hold(dsl_pool_t
*dp
, const char *name
,
487 void *tag
, dsl_dataset_t
**dsp
)
490 const char *snapname
;
494 err
= dsl_dir_hold(dp
, name
, FTAG
, &dd
, &snapname
);
498 ASSERT(dsl_pool_config_held(dp
));
499 obj
= dsl_dir_phys(dd
)->dd_head_dataset_obj
;
501 err
= dsl_dataset_hold_obj(dp
, obj
, tag
, dsp
);
503 err
= SET_ERROR(ENOENT
);
505 /* we may be looking for a snapshot */
506 if (err
== 0 && snapname
!= NULL
) {
509 if (*snapname
++ != '@') {
510 dsl_dataset_rele(*dsp
, tag
);
511 dsl_dir_rele(dd
, FTAG
);
512 return (SET_ERROR(ENOENT
));
515 dprintf("looking for snapshot '%s'\n", snapname
);
516 err
= dsl_dataset_snap_lookup(*dsp
, snapname
, &obj
);
518 err
= dsl_dataset_hold_obj(dp
, obj
, tag
, &ds
);
519 dsl_dataset_rele(*dsp
, tag
);
522 mutex_enter(&ds
->ds_lock
);
523 if (ds
->ds_snapname
[0] == 0)
524 (void) strlcpy(ds
->ds_snapname
, snapname
,
525 sizeof (ds
->ds_snapname
));
526 mutex_exit(&ds
->ds_lock
);
531 dsl_dir_rele(dd
, FTAG
);
536 dsl_dataset_own_obj(dsl_pool_t
*dp
, uint64_t dsobj
,
537 void *tag
, dsl_dataset_t
**dsp
)
539 int err
= dsl_dataset_hold_obj(dp
, dsobj
, tag
, dsp
);
542 if (!dsl_dataset_tryown(*dsp
, tag
)) {
543 dsl_dataset_rele(*dsp
, tag
);
545 return (SET_ERROR(EBUSY
));
551 dsl_dataset_own(dsl_pool_t
*dp
, const char *name
,
552 void *tag
, dsl_dataset_t
**dsp
)
554 int err
= dsl_dataset_hold(dp
, name
, tag
, dsp
);
557 if (!dsl_dataset_tryown(*dsp
, tag
)) {
558 dsl_dataset_rele(*dsp
, tag
);
559 return (SET_ERROR(EBUSY
));
565 * See the comment above dsl_pool_hold() for details. In summary, a long
566 * hold is used to prevent destruction of a dataset while the pool hold
567 * is dropped, allowing other concurrent operations (e.g. spa_sync()).
569 * The dataset and pool must be held when this function is called. After it
570 * is called, the pool hold may be released while the dataset is still held
574 dsl_dataset_long_hold(dsl_dataset_t
*ds
, void *tag
)
576 ASSERT(dsl_pool_config_held(ds
->ds_dir
->dd_pool
));
577 (void) refcount_add(&ds
->ds_longholds
, tag
);
581 dsl_dataset_long_rele(dsl_dataset_t
*ds
, void *tag
)
583 (void) refcount_remove(&ds
->ds_longholds
, tag
);
586 /* Return B_TRUE if there are any long holds on this dataset. */
588 dsl_dataset_long_held(dsl_dataset_t
*ds
)
590 return (!refcount_is_zero(&ds
->ds_longholds
));
594 dsl_dataset_name(dsl_dataset_t
*ds
, char *name
)
597 (void) strcpy(name
, "mos");
599 dsl_dir_name(ds
->ds_dir
, name
);
600 VERIFY0(dsl_dataset_get_snapname(ds
));
601 if (ds
->ds_snapname
[0]) {
602 (void) strcat(name
, "@");
604 * We use a "recursive" mutex so that we
605 * can call dprintf_ds() with ds_lock held.
607 if (!MUTEX_HELD(&ds
->ds_lock
)) {
608 mutex_enter(&ds
->ds_lock
);
609 (void) strcat(name
, ds
->ds_snapname
);
610 mutex_exit(&ds
->ds_lock
);
612 (void) strcat(name
, ds
->ds_snapname
);
619 dsl_dataset_rele(dsl_dataset_t
*ds
, void *tag
)
621 dmu_buf_rele(ds
->ds_dbuf
, tag
);
625 dsl_dataset_disown(dsl_dataset_t
*ds
, void *tag
)
627 ASSERT3P(ds
->ds_owner
, ==, tag
);
628 ASSERT(ds
->ds_dbuf
!= NULL
);
630 mutex_enter(&ds
->ds_lock
);
632 mutex_exit(&ds
->ds_lock
);
633 dsl_dataset_long_rele(ds
, tag
);
634 dsl_dataset_rele(ds
, tag
);
638 dsl_dataset_tryown(dsl_dataset_t
*ds
, void *tag
)
640 boolean_t gotit
= FALSE
;
642 mutex_enter(&ds
->ds_lock
);
643 if (ds
->ds_owner
== NULL
&& !DS_IS_INCONSISTENT(ds
)) {
645 dsl_dataset_long_hold(ds
, tag
);
648 mutex_exit(&ds
->ds_lock
);
653 dsl_dataset_create_sync_dd(dsl_dir_t
*dd
, dsl_dataset_t
*origin
,
654 uint64_t flags
, dmu_tx_t
*tx
)
656 dsl_pool_t
*dp
= dd
->dd_pool
;
658 dsl_dataset_phys_t
*dsphys
;
660 objset_t
*mos
= dp
->dp_meta_objset
;
663 origin
= dp
->dp_origin_snap
;
665 ASSERT(origin
== NULL
|| origin
->ds_dir
->dd_pool
== dp
);
666 ASSERT(origin
== NULL
|| dsl_dataset_phys(origin
)->ds_num_children
> 0);
667 ASSERT(dmu_tx_is_syncing(tx
));
668 ASSERT(dsl_dir_phys(dd
)->dd_head_dataset_obj
== 0);
670 dsobj
= dmu_object_alloc(mos
, DMU_OT_DSL_DATASET
, 0,
671 DMU_OT_DSL_DATASET
, sizeof (dsl_dataset_phys_t
), tx
);
672 VERIFY0(dmu_bonus_hold(mos
, dsobj
, FTAG
, &dbuf
));
673 dmu_buf_will_dirty(dbuf
, tx
);
674 dsphys
= dbuf
->db_data
;
675 bzero(dsphys
, sizeof (dsl_dataset_phys_t
));
676 dsphys
->ds_dir_obj
= dd
->dd_object
;
677 dsphys
->ds_flags
= flags
;
678 dsphys
->ds_fsid_guid
= unique_create();
679 (void) random_get_pseudo_bytes((void*)&dsphys
->ds_guid
,
680 sizeof (dsphys
->ds_guid
));
681 dsphys
->ds_snapnames_zapobj
=
682 zap_create_norm(mos
, U8_TEXTPREP_TOUPPER
, DMU_OT_DSL_DS_SNAP_MAP
,
684 dsphys
->ds_creation_time
= gethrestime_sec();
685 dsphys
->ds_creation_txg
= tx
->tx_txg
== TXG_INITIAL
? 1 : tx
->tx_txg
;
687 if (origin
== NULL
) {
688 dsphys
->ds_deadlist_obj
= dsl_deadlist_alloc(mos
, tx
);
690 dsl_dataset_t
*ohds
; /* head of the origin snapshot */
692 dsphys
->ds_prev_snap_obj
= origin
->ds_object
;
693 dsphys
->ds_prev_snap_txg
=
694 dsl_dataset_phys(origin
)->ds_creation_txg
;
695 dsphys
->ds_referenced_bytes
=
696 dsl_dataset_phys(origin
)->ds_referenced_bytes
;
697 dsphys
->ds_compressed_bytes
=
698 dsl_dataset_phys(origin
)->ds_compressed_bytes
;
699 dsphys
->ds_uncompressed_bytes
=
700 dsl_dataset_phys(origin
)->ds_uncompressed_bytes
;
701 dsphys
->ds_bp
= dsl_dataset_phys(origin
)->ds_bp
;
704 * Inherit flags that describe the dataset's contents
705 * (INCONSISTENT) or properties (Case Insensitive).
707 dsphys
->ds_flags
|= dsl_dataset_phys(origin
)->ds_flags
&
708 (DS_FLAG_INCONSISTENT
| DS_FLAG_CI_DATASET
);
710 dmu_buf_will_dirty(origin
->ds_dbuf
, tx
);
711 dsl_dataset_phys(origin
)->ds_num_children
++;
713 VERIFY0(dsl_dataset_hold_obj(dp
,
714 dsl_dir_phys(origin
->ds_dir
)->dd_head_dataset_obj
,
716 dsphys
->ds_deadlist_obj
= dsl_deadlist_clone(&ohds
->ds_deadlist
,
717 dsphys
->ds_prev_snap_txg
, dsphys
->ds_prev_snap_obj
, tx
);
718 dsl_dataset_rele(ohds
, FTAG
);
720 if (spa_version(dp
->dp_spa
) >= SPA_VERSION_NEXT_CLONES
) {
721 if (dsl_dataset_phys(origin
)->ds_next_clones_obj
== 0) {
722 dsl_dataset_phys(origin
)->ds_next_clones_obj
=
724 DMU_OT_NEXT_CLONES
, DMU_OT_NONE
, 0, tx
);
726 VERIFY0(zap_add_int(mos
,
727 dsl_dataset_phys(origin
)->ds_next_clones_obj
,
731 dmu_buf_will_dirty(dd
->dd_dbuf
, tx
);
732 dsl_dir_phys(dd
)->dd_origin_obj
= origin
->ds_object
;
733 if (spa_version(dp
->dp_spa
) >= SPA_VERSION_DIR_CLONES
) {
734 if (dsl_dir_phys(origin
->ds_dir
)->dd_clones
== 0) {
735 dmu_buf_will_dirty(origin
->ds_dir
->dd_dbuf
, tx
);
736 dsl_dir_phys(origin
->ds_dir
)->dd_clones
=
738 DMU_OT_DSL_CLONES
, DMU_OT_NONE
, 0, tx
);
740 VERIFY0(zap_add_int(mos
,
741 dsl_dir_phys(origin
->ds_dir
)->dd_clones
,
746 if (spa_version(dp
->dp_spa
) >= SPA_VERSION_UNIQUE_ACCURATE
)
747 dsphys
->ds_flags
|= DS_FLAG_UNIQUE_ACCURATE
;
749 dmu_buf_rele(dbuf
, FTAG
);
751 dmu_buf_will_dirty(dd
->dd_dbuf
, tx
);
752 dsl_dir_phys(dd
)->dd_head_dataset_obj
= dsobj
;
758 dsl_dataset_zero_zil(dsl_dataset_t
*ds
, dmu_tx_t
*tx
)
762 VERIFY0(dmu_objset_from_ds(ds
, &os
));
763 bzero(&os
->os_zil_header
, sizeof (os
->os_zil_header
));
764 dsl_dataset_dirty(ds
, tx
);
768 dsl_dataset_create_sync(dsl_dir_t
*pdd
, const char *lastname
,
769 dsl_dataset_t
*origin
, uint64_t flags
, cred_t
*cr
, dmu_tx_t
*tx
)
771 dsl_pool_t
*dp
= pdd
->dd_pool
;
772 uint64_t dsobj
, ddobj
;
775 ASSERT(dmu_tx_is_syncing(tx
));
776 ASSERT(lastname
[0] != '@');
778 ddobj
= dsl_dir_create_sync(dp
, pdd
, lastname
, tx
);
779 VERIFY0(dsl_dir_hold_obj(dp
, ddobj
, lastname
, FTAG
, &dd
));
781 dsobj
= dsl_dataset_create_sync_dd(dd
, origin
,
782 flags
& ~DS_CREATE_FLAG_NODIRTY
, tx
);
784 dsl_deleg_set_create_perms(dd
, tx
, cr
);
787 * Since we're creating a new node we know it's a leaf, so we can
788 * initialize the counts if the limit feature is active.
790 if (spa_feature_is_active(dp
->dp_spa
, SPA_FEATURE_FS_SS_LIMIT
)) {
792 objset_t
*os
= dd
->dd_pool
->dp_meta_objset
;
794 dsl_dir_zapify(dd
, tx
);
795 VERIFY0(zap_add(os
, dd
->dd_object
, DD_FIELD_FILESYSTEM_COUNT
,
796 sizeof (cnt
), 1, &cnt
, tx
));
797 VERIFY0(zap_add(os
, dd
->dd_object
, DD_FIELD_SNAPSHOT_COUNT
,
798 sizeof (cnt
), 1, &cnt
, tx
));
801 dsl_dir_rele(dd
, FTAG
);
804 * If we are creating a clone, make sure we zero out any stale
805 * data from the origin snapshots zil header.
807 if (origin
!= NULL
&& !(flags
& DS_CREATE_FLAG_NODIRTY
)) {
810 VERIFY0(dsl_dataset_hold_obj(dp
, dsobj
, FTAG
, &ds
));
811 dsl_dataset_zero_zil(ds
, tx
);
812 dsl_dataset_rele(ds
, FTAG
);
819 * The unique space in the head dataset can be calculated by subtracting
820 * the space used in the most recent snapshot, that is still being used
821 * in this file system, from the space currently in use. To figure out
822 * the space in the most recent snapshot still in use, we need to take
823 * the total space used in the snapshot and subtract out the space that
824 * has been freed up since the snapshot was taken.
827 dsl_dataset_recalc_head_uniq(dsl_dataset_t
*ds
)
830 uint64_t dlused
, dlcomp
, dluncomp
;
832 ASSERT(!dsl_dataset_is_snapshot(ds
));
834 if (dsl_dataset_phys(ds
)->ds_prev_snap_obj
!= 0)
835 mrs_used
= dsl_dataset_phys(ds
->ds_prev
)->ds_referenced_bytes
;
839 dsl_deadlist_space(&ds
->ds_deadlist
, &dlused
, &dlcomp
, &dluncomp
);
841 ASSERT3U(dlused
, <=, mrs_used
);
842 dsl_dataset_phys(ds
)->ds_unique_bytes
=
843 dsl_dataset_phys(ds
)->ds_referenced_bytes
- (mrs_used
- dlused
);
845 if (spa_version(ds
->ds_dir
->dd_pool
->dp_spa
) >=
846 SPA_VERSION_UNIQUE_ACCURATE
)
847 dsl_dataset_phys(ds
)->ds_flags
|= DS_FLAG_UNIQUE_ACCURATE
;
851 dsl_dataset_remove_from_next_clones(dsl_dataset_t
*ds
, uint64_t obj
,
854 objset_t
*mos
= ds
->ds_dir
->dd_pool
->dp_meta_objset
;
856 ASSERTV(uint64_t count
);
858 ASSERT(dsl_dataset_phys(ds
)->ds_num_children
>= 2);
859 err
= zap_remove_int(mos
, dsl_dataset_phys(ds
)->ds_next_clones_obj
,
862 * The err should not be ENOENT, but a bug in a previous version
863 * of the code could cause upgrade_clones_cb() to not set
864 * ds_next_snap_obj when it should, leading to a missing entry.
865 * If we knew that the pool was created after
866 * SPA_VERSION_NEXT_CLONES, we could assert that it isn't
867 * ENOENT. However, at least we can check that we don't have
868 * too many entries in the next_clones_obj even after failing to
873 ASSERT0(zap_count(mos
, dsl_dataset_phys(ds
)->ds_next_clones_obj
,
875 ASSERT3U(count
, <=, dsl_dataset_phys(ds
)->ds_num_children
- 2);
880 dsl_dataset_get_blkptr(dsl_dataset_t
*ds
)
882 return (&dsl_dataset_phys(ds
)->ds_bp
);
886 dsl_dataset_set_blkptr(dsl_dataset_t
*ds
, blkptr_t
*bp
, dmu_tx_t
*tx
)
888 ASSERT(dmu_tx_is_syncing(tx
));
889 /* If it's the meta-objset, set dp_meta_rootbp */
891 tx
->tx_pool
->dp_meta_rootbp
= *bp
;
893 dmu_buf_will_dirty(ds
->ds_dbuf
, tx
);
894 dsl_dataset_phys(ds
)->ds_bp
= *bp
;
899 dsl_dataset_get_spa(dsl_dataset_t
*ds
)
901 return (ds
->ds_dir
->dd_pool
->dp_spa
);
905 dsl_dataset_dirty(dsl_dataset_t
*ds
, dmu_tx_t
*tx
)
909 if (ds
== NULL
) /* this is the meta-objset */
912 ASSERT(ds
->ds_objset
!= NULL
);
914 if (dsl_dataset_phys(ds
)->ds_next_snap_obj
!= 0)
915 panic("dirtying snapshot!");
917 dp
= ds
->ds_dir
->dd_pool
;
919 if (txg_list_add(&dp
->dp_dirty_datasets
, ds
, tx
->tx_txg
)) {
920 /* up the hold count until we can be written out */
921 dmu_buf_add_ref(ds
->ds_dbuf
, ds
);
926 dsl_dataset_is_dirty(dsl_dataset_t
*ds
)
930 for (t
= 0; t
< TXG_SIZE
; t
++) {
931 if (txg_list_member(&ds
->ds_dir
->dd_pool
->dp_dirty_datasets
,
939 dsl_dataset_snapshot_reserve_space(dsl_dataset_t
*ds
, dmu_tx_t
*tx
)
943 if (!dmu_tx_is_syncing(tx
))
947 * If there's an fs-only reservation, any blocks that might become
948 * owned by the snapshot dataset must be accommodated by space
949 * outside of the reservation.
951 ASSERT(ds
->ds_reserved
== 0 || DS_UNIQUE_IS_ACCURATE(ds
));
952 asize
= MIN(dsl_dataset_phys(ds
)->ds_unique_bytes
, ds
->ds_reserved
);
953 if (asize
> dsl_dir_space_available(ds
->ds_dir
, NULL
, 0, TRUE
))
954 return (SET_ERROR(ENOSPC
));
957 * Propagate any reserved space for this snapshot to other
958 * snapshot checks in this sync group.
961 dsl_dir_willuse_space(ds
->ds_dir
, asize
, tx
);
966 typedef struct dsl_dataset_snapshot_arg
{
967 nvlist_t
*ddsa_snaps
;
968 nvlist_t
*ddsa_props
;
969 nvlist_t
*ddsa_errors
;
971 } dsl_dataset_snapshot_arg_t
;
974 dsl_dataset_snapshot_check_impl(dsl_dataset_t
*ds
, const char *snapname
,
975 dmu_tx_t
*tx
, boolean_t recv
, uint64_t cnt
, cred_t
*cr
)
980 ds
->ds_trysnap_txg
= tx
->tx_txg
;
982 if (!dmu_tx_is_syncing(tx
))
986 * We don't allow multiple snapshots of the same txg. If there
987 * is already one, try again.
989 if (dsl_dataset_phys(ds
)->ds_prev_snap_txg
>= tx
->tx_txg
)
990 return (SET_ERROR(EAGAIN
));
993 * Check for conflicting snapshot name.
995 error
= dsl_dataset_snap_lookup(ds
, snapname
, &value
);
997 return (SET_ERROR(EEXIST
));
1002 * We don't allow taking snapshots of inconsistent datasets, such as
1003 * those into which we are currently receiving. However, if we are
1004 * creating this snapshot as part of a receive, this check will be
1005 * executed atomically with respect to the completion of the receive
1006 * itself but prior to the clearing of DS_FLAG_INCONSISTENT; in this
1007 * case we ignore this, knowing it will be fixed up for us shortly in
1008 * dmu_recv_end_sync().
1010 if (!recv
&& DS_IS_INCONSISTENT(ds
))
1011 return (SET_ERROR(EBUSY
));
1014 * Skip the check for temporary snapshots or if we have already checked
1015 * the counts in dsl_dataset_snapshot_check. This means we really only
1016 * check the count here when we're receiving a stream.
1018 if (cnt
!= 0 && cr
!= NULL
) {
1019 error
= dsl_fs_ss_limit_check(ds
->ds_dir
, cnt
,
1020 ZFS_PROP_SNAPSHOT_LIMIT
, NULL
, cr
);
1025 error
= dsl_dataset_snapshot_reserve_space(ds
, tx
);
1033 dsl_dataset_snapshot_check(void *arg
, dmu_tx_t
*tx
)
1035 dsl_dataset_snapshot_arg_t
*ddsa
= arg
;
1036 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
1041 * Pre-compute how many total new snapshots will be created for each
1042 * level in the tree and below. This is needed for validating the
1043 * snapshot limit when either taking a recursive snapshot or when
1044 * taking multiple snapshots.
1046 * The problem is that the counts are not actually adjusted when
1047 * we are checking, only when we finally sync. For a single snapshot,
1048 * this is easy, the count will increase by 1 at each node up the tree,
1049 * but its more complicated for the recursive/multiple snapshot case.
1051 * The dsl_fs_ss_limit_check function does recursively check the count
1052 * at each level up the tree but since it is validating each snapshot
1053 * independently we need to be sure that we are validating the complete
1054 * count for the entire set of snapshots. We do this by rolling up the
1055 * counts for each component of the name into an nvlist and then
1056 * checking each of those cases with the aggregated count.
1058 * This approach properly handles not only the recursive snapshot
1059 * case (where we get all of those on the ddsa_snaps list) but also
1060 * the sibling case (e.g. snapshot a/b and a/c so that we will also
1061 * validate the limit on 'a' using a count of 2).
1063 * We validate the snapshot names in the third loop and only report
1066 if (dmu_tx_is_syncing(tx
)) {
1068 nvlist_t
*cnt_track
= NULL
;
1069 cnt_track
= fnvlist_alloc();
1071 nm
= kmem_alloc(MAXPATHLEN
, KM_SLEEP
);
1073 /* Rollup aggregated counts into the cnt_track list */
1074 for (pair
= nvlist_next_nvpair(ddsa
->ddsa_snaps
, NULL
);
1076 pair
= nvlist_next_nvpair(ddsa
->ddsa_snaps
, pair
)) {
1080 (void) strlcpy(nm
, nvpair_name(pair
), MAXPATHLEN
);
1081 pdelim
= strchr(nm
, '@');
1087 if (nvlist_lookup_uint64(cnt_track
, nm
,
1089 /* update existing entry */
1090 fnvlist_add_uint64(cnt_track
, nm
,
1094 fnvlist_add_uint64(cnt_track
, nm
, 1);
1097 pdelim
= strrchr(nm
, '/');
1100 } while (pdelim
!= NULL
);
1103 kmem_free(nm
, MAXPATHLEN
);
1105 /* Check aggregated counts at each level */
1106 for (pair
= nvlist_next_nvpair(cnt_track
, NULL
);
1107 pair
!= NULL
; pair
= nvlist_next_nvpair(cnt_track
, pair
)) {
1113 name
= nvpair_name(pair
);
1114 cnt
= fnvpair_value_uint64(pair
);
1117 error
= dsl_dataset_hold(dp
, name
, FTAG
, &ds
);
1119 error
= dsl_fs_ss_limit_check(ds
->ds_dir
, cnt
,
1120 ZFS_PROP_SNAPSHOT_LIMIT
, NULL
,
1122 dsl_dataset_rele(ds
, FTAG
);
1126 if (ddsa
->ddsa_errors
!= NULL
)
1127 fnvlist_add_int32(ddsa
->ddsa_errors
,
1130 /* only report one error for this check */
1134 nvlist_free(cnt_track
);
1137 for (pair
= nvlist_next_nvpair(ddsa
->ddsa_snaps
, NULL
);
1138 pair
!= NULL
; pair
= nvlist_next_nvpair(ddsa
->ddsa_snaps
, pair
)) {
1142 char dsname
[MAXNAMELEN
];
1144 name
= nvpair_name(pair
);
1145 if (strlen(name
) >= MAXNAMELEN
)
1146 error
= SET_ERROR(ENAMETOOLONG
);
1148 atp
= strchr(name
, '@');
1150 error
= SET_ERROR(EINVAL
);
1152 (void) strlcpy(dsname
, name
, atp
- name
+ 1);
1155 error
= dsl_dataset_hold(dp
, dsname
, FTAG
, &ds
);
1157 /* passing 0/NULL skips dsl_fs_ss_limit_check */
1158 error
= dsl_dataset_snapshot_check_impl(ds
,
1159 atp
+ 1, tx
, B_FALSE
, 0, NULL
);
1160 dsl_dataset_rele(ds
, FTAG
);
1164 if (ddsa
->ddsa_errors
!= NULL
) {
1165 fnvlist_add_int32(ddsa
->ddsa_errors
,
1176 dsl_dataset_snapshot_sync_impl(dsl_dataset_t
*ds
, const char *snapname
,
1179 dsl_pool_t
*dp
= ds
->ds_dir
->dd_pool
;
1181 dsl_dataset_phys_t
*dsphys
;
1182 uint64_t dsobj
, crtxg
;
1183 objset_t
*mos
= dp
->dp_meta_objset
;
1184 ASSERTV(static zil_header_t zero_zil
);
1185 ASSERTV(objset_t
*os
);
1187 ASSERT(RRW_WRITE_HELD(&dp
->dp_config_rwlock
));
1190 * If we are on an old pool, the zil must not be active, in which
1191 * case it will be zeroed. Usually zil_suspend() accomplishes this.
1193 ASSERT(spa_version(dmu_tx_pool(tx
)->dp_spa
) >= SPA_VERSION_FAST_SNAP
||
1194 dmu_objset_from_ds(ds
, &os
) != 0 ||
1195 bcmp(&os
->os_phys
->os_zil_header
, &zero_zil
,
1196 sizeof (zero_zil
)) == 0);
1198 dsl_fs_ss_count_adjust(ds
->ds_dir
, 1, DD_FIELD_SNAPSHOT_COUNT
, tx
);
1201 * The origin's ds_creation_txg has to be < TXG_INITIAL
1203 if (strcmp(snapname
, ORIGIN_DIR_NAME
) == 0)
1208 dsobj
= dmu_object_alloc(mos
, DMU_OT_DSL_DATASET
, 0,
1209 DMU_OT_DSL_DATASET
, sizeof (dsl_dataset_phys_t
), tx
);
1210 VERIFY0(dmu_bonus_hold(mos
, dsobj
, FTAG
, &dbuf
));
1211 dmu_buf_will_dirty(dbuf
, tx
);
1212 dsphys
= dbuf
->db_data
;
1213 bzero(dsphys
, sizeof (dsl_dataset_phys_t
));
1214 dsphys
->ds_dir_obj
= ds
->ds_dir
->dd_object
;
1215 dsphys
->ds_fsid_guid
= unique_create();
1216 (void) random_get_pseudo_bytes((void*)&dsphys
->ds_guid
,
1217 sizeof (dsphys
->ds_guid
));
1218 dsphys
->ds_prev_snap_obj
= dsl_dataset_phys(ds
)->ds_prev_snap_obj
;
1219 dsphys
->ds_prev_snap_txg
= dsl_dataset_phys(ds
)->ds_prev_snap_txg
;
1220 dsphys
->ds_next_snap_obj
= ds
->ds_object
;
1221 dsphys
->ds_num_children
= 1;
1222 dsphys
->ds_creation_time
= gethrestime_sec();
1223 dsphys
->ds_creation_txg
= crtxg
;
1224 dsphys
->ds_deadlist_obj
= dsl_dataset_phys(ds
)->ds_deadlist_obj
;
1225 dsphys
->ds_referenced_bytes
= dsl_dataset_phys(ds
)->ds_referenced_bytes
;
1226 dsphys
->ds_compressed_bytes
= dsl_dataset_phys(ds
)->ds_compressed_bytes
;
1227 dsphys
->ds_uncompressed_bytes
=
1228 dsl_dataset_phys(ds
)->ds_uncompressed_bytes
;
1229 dsphys
->ds_flags
= dsl_dataset_phys(ds
)->ds_flags
;
1230 dsphys
->ds_bp
= dsl_dataset_phys(ds
)->ds_bp
;
1231 dmu_buf_rele(dbuf
, FTAG
);
1233 ASSERT3U(ds
->ds_prev
!= 0, ==,
1234 dsl_dataset_phys(ds
)->ds_prev_snap_obj
!= 0);
1236 uint64_t next_clones_obj
=
1237 dsl_dataset_phys(ds
->ds_prev
)->ds_next_clones_obj
;
1238 ASSERT(dsl_dataset_phys(ds
->ds_prev
)->ds_next_snap_obj
==
1240 dsl_dataset_phys(ds
->ds_prev
)->ds_num_children
> 1);
1241 if (dsl_dataset_phys(ds
->ds_prev
)->ds_next_snap_obj
==
1243 dmu_buf_will_dirty(ds
->ds_prev
->ds_dbuf
, tx
);
1244 ASSERT3U(dsl_dataset_phys(ds
)->ds_prev_snap_txg
, ==,
1245 dsl_dataset_phys(ds
->ds_prev
)->ds_creation_txg
);
1246 dsl_dataset_phys(ds
->ds_prev
)->ds_next_snap_obj
= dsobj
;
1247 } else if (next_clones_obj
!= 0) {
1248 dsl_dataset_remove_from_next_clones(ds
->ds_prev
,
1249 dsphys
->ds_next_snap_obj
, tx
);
1250 VERIFY0(zap_add_int(mos
,
1251 next_clones_obj
, dsobj
, tx
));
1256 * If we have a reference-reservation on this dataset, we will
1257 * need to increase the amount of refreservation being charged
1258 * since our unique space is going to zero.
1260 if (ds
->ds_reserved
) {
1262 ASSERT(DS_UNIQUE_IS_ACCURATE(ds
));
1263 delta
= MIN(dsl_dataset_phys(ds
)->ds_unique_bytes
,
1265 dsl_dir_diduse_space(ds
->ds_dir
, DD_USED_REFRSRV
,
1269 dmu_buf_will_dirty(ds
->ds_dbuf
, tx
);
1270 dsl_dataset_phys(ds
)->ds_deadlist_obj
=
1271 dsl_deadlist_clone(&ds
->ds_deadlist
, UINT64_MAX
,
1272 dsl_dataset_phys(ds
)->ds_prev_snap_obj
, tx
);
1273 dsl_deadlist_close(&ds
->ds_deadlist
);
1274 dsl_deadlist_open(&ds
->ds_deadlist
, mos
,
1275 dsl_dataset_phys(ds
)->ds_deadlist_obj
);
1276 dsl_deadlist_add_key(&ds
->ds_deadlist
,
1277 dsl_dataset_phys(ds
)->ds_prev_snap_txg
, tx
);
1279 ASSERT3U(dsl_dataset_phys(ds
)->ds_prev_snap_txg
, <, tx
->tx_txg
);
1280 dsl_dataset_phys(ds
)->ds_prev_snap_obj
= dsobj
;
1281 dsl_dataset_phys(ds
)->ds_prev_snap_txg
= crtxg
;
1282 dsl_dataset_phys(ds
)->ds_unique_bytes
= 0;
1283 if (spa_version(dp
->dp_spa
) >= SPA_VERSION_UNIQUE_ACCURATE
)
1284 dsl_dataset_phys(ds
)->ds_flags
|= DS_FLAG_UNIQUE_ACCURATE
;
1286 VERIFY0(zap_add(mos
, dsl_dataset_phys(ds
)->ds_snapnames_zapobj
,
1287 snapname
, 8, 1, &dsobj
, tx
));
1290 dsl_dataset_rele(ds
->ds_prev
, ds
);
1291 VERIFY0(dsl_dataset_hold_obj(dp
,
1292 dsl_dataset_phys(ds
)->ds_prev_snap_obj
, ds
, &ds
->ds_prev
));
1294 dsl_scan_ds_snapshotted(ds
, tx
);
1296 dsl_dir_snap_cmtime_update(ds
->ds_dir
);
1298 spa_history_log_internal_ds(ds
->ds_prev
, "snapshot", tx
, "");
1302 dsl_dataset_snapshot_sync(void *arg
, dmu_tx_t
*tx
)
1304 dsl_dataset_snapshot_arg_t
*ddsa
= arg
;
1305 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
1308 for (pair
= nvlist_next_nvpair(ddsa
->ddsa_snaps
, NULL
);
1309 pair
!= NULL
; pair
= nvlist_next_nvpair(ddsa
->ddsa_snaps
, pair
)) {
1312 char dsname
[MAXNAMELEN
];
1314 name
= nvpair_name(pair
);
1315 atp
= strchr(name
, '@');
1316 (void) strlcpy(dsname
, name
, atp
- name
+ 1);
1317 VERIFY0(dsl_dataset_hold(dp
, dsname
, FTAG
, &ds
));
1319 dsl_dataset_snapshot_sync_impl(ds
, atp
+ 1, tx
);
1320 if (ddsa
->ddsa_props
!= NULL
) {
1321 dsl_props_set_sync_impl(ds
->ds_prev
,
1322 ZPROP_SRC_LOCAL
, ddsa
->ddsa_props
, tx
);
1324 dsl_dataset_rele(ds
, FTAG
);
1329 * The snapshots must all be in the same pool.
1330 * All-or-nothing: if there are any failures, nothing will be modified.
1333 dsl_dataset_snapshot(nvlist_t
*snaps
, nvlist_t
*props
, nvlist_t
*errors
)
1335 dsl_dataset_snapshot_arg_t ddsa
;
1337 boolean_t needsuspend
;
1341 nvlist_t
*suspended
= NULL
;
1343 pair
= nvlist_next_nvpair(snaps
, NULL
);
1346 firstname
= nvpair_name(pair
);
1348 error
= spa_open(firstname
, &spa
, FTAG
);
1351 needsuspend
= (spa_version(spa
) < SPA_VERSION_FAST_SNAP
);
1352 spa_close(spa
, FTAG
);
1355 suspended
= fnvlist_alloc();
1356 for (pair
= nvlist_next_nvpair(snaps
, NULL
); pair
!= NULL
;
1357 pair
= nvlist_next_nvpair(snaps
, pair
)) {
1358 char fsname
[MAXNAMELEN
];
1359 char *snapname
= nvpair_name(pair
);
1363 atp
= strchr(snapname
, '@');
1365 error
= SET_ERROR(EINVAL
);
1368 (void) strlcpy(fsname
, snapname
, atp
- snapname
+ 1);
1370 error
= zil_suspend(fsname
, &cookie
);
1373 fnvlist_add_uint64(suspended
, fsname
,
1378 ddsa
.ddsa_snaps
= snaps
;
1379 ddsa
.ddsa_props
= props
;
1380 ddsa
.ddsa_errors
= errors
;
1381 ddsa
.ddsa_cr
= CRED();
1384 error
= dsl_sync_task(firstname
, dsl_dataset_snapshot_check
,
1385 dsl_dataset_snapshot_sync
, &ddsa
,
1386 fnvlist_num_pairs(snaps
) * 3);
1389 if (suspended
!= NULL
) {
1390 for (pair
= nvlist_next_nvpair(suspended
, NULL
); pair
!= NULL
;
1391 pair
= nvlist_next_nvpair(suspended
, pair
)) {
1392 zil_resume((void *)(uintptr_t)
1393 fnvpair_value_uint64(pair
));
1395 fnvlist_free(suspended
);
1400 for (pair
= nvlist_next_nvpair(snaps
, NULL
); pair
!= NULL
;
1401 pair
= nvlist_next_nvpair(snaps
, pair
)) {
1402 char *snapname
= nvpair_name(pair
);
1403 zvol_create_minors(snapname
);
1411 typedef struct dsl_dataset_snapshot_tmp_arg
{
1412 const char *ddsta_fsname
;
1413 const char *ddsta_snapname
;
1414 minor_t ddsta_cleanup_minor
;
1415 const char *ddsta_htag
;
1416 } dsl_dataset_snapshot_tmp_arg_t
;
1419 dsl_dataset_snapshot_tmp_check(void *arg
, dmu_tx_t
*tx
)
1421 dsl_dataset_snapshot_tmp_arg_t
*ddsta
= arg
;
1422 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
1426 error
= dsl_dataset_hold(dp
, ddsta
->ddsta_fsname
, FTAG
, &ds
);
1430 /* NULL cred means no limit check for tmp snapshot */
1431 error
= dsl_dataset_snapshot_check_impl(ds
, ddsta
->ddsta_snapname
,
1432 tx
, B_FALSE
, 0, NULL
);
1434 dsl_dataset_rele(ds
, FTAG
);
1438 if (spa_version(dp
->dp_spa
) < SPA_VERSION_USERREFS
) {
1439 dsl_dataset_rele(ds
, FTAG
);
1440 return (SET_ERROR(ENOTSUP
));
1442 error
= dsl_dataset_user_hold_check_one(NULL
, ddsta
->ddsta_htag
,
1445 dsl_dataset_rele(ds
, FTAG
);
1449 dsl_dataset_rele(ds
, FTAG
);
1454 dsl_dataset_snapshot_tmp_sync(void *arg
, dmu_tx_t
*tx
)
1456 dsl_dataset_snapshot_tmp_arg_t
*ddsta
= arg
;
1457 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
1460 VERIFY0(dsl_dataset_hold(dp
, ddsta
->ddsta_fsname
, FTAG
, &ds
));
1462 dsl_dataset_snapshot_sync_impl(ds
, ddsta
->ddsta_snapname
, tx
);
1463 dsl_dataset_user_hold_sync_one(ds
->ds_prev
, ddsta
->ddsta_htag
,
1464 ddsta
->ddsta_cleanup_minor
, gethrestime_sec(), tx
);
1465 dsl_destroy_snapshot_sync_impl(ds
->ds_prev
, B_TRUE
, tx
);
1467 dsl_dataset_rele(ds
, FTAG
);
1471 dsl_dataset_snapshot_tmp(const char *fsname
, const char *snapname
,
1472 minor_t cleanup_minor
, const char *htag
)
1474 dsl_dataset_snapshot_tmp_arg_t ddsta
;
1477 boolean_t needsuspend
;
1480 ddsta
.ddsta_fsname
= fsname
;
1481 ddsta
.ddsta_snapname
= snapname
;
1482 ddsta
.ddsta_cleanup_minor
= cleanup_minor
;
1483 ddsta
.ddsta_htag
= htag
;
1485 error
= spa_open(fsname
, &spa
, FTAG
);
1488 needsuspend
= (spa_version(spa
) < SPA_VERSION_FAST_SNAP
);
1489 spa_close(spa
, FTAG
);
1492 error
= zil_suspend(fsname
, &cookie
);
1497 error
= dsl_sync_task(fsname
, dsl_dataset_snapshot_tmp_check
,
1498 dsl_dataset_snapshot_tmp_sync
, &ddsta
, 3);
1507 dsl_dataset_sync(dsl_dataset_t
*ds
, zio_t
*zio
, dmu_tx_t
*tx
)
1509 ASSERT(dmu_tx_is_syncing(tx
));
1510 ASSERT(ds
->ds_objset
!= NULL
);
1511 ASSERT(dsl_dataset_phys(ds
)->ds_next_snap_obj
== 0);
1514 * in case we had to change ds_fsid_guid when we opened it,
1517 dmu_buf_will_dirty(ds
->ds_dbuf
, tx
);
1518 dsl_dataset_phys(ds
)->ds_fsid_guid
= ds
->ds_fsid_guid
;
1520 dmu_objset_sync(ds
->ds_objset
, zio
, tx
);
1524 get_clones_stat(dsl_dataset_t
*ds
, nvlist_t
*nv
)
1527 objset_t
*mos
= ds
->ds_dir
->dd_pool
->dp_meta_objset
;
1530 nvlist_t
*propval
= fnvlist_alloc();
1531 nvlist_t
*val
= fnvlist_alloc();
1533 ASSERT(dsl_pool_config_held(ds
->ds_dir
->dd_pool
));
1536 * There may be missing entries in ds_next_clones_obj
1537 * due to a bug in a previous version of the code.
1538 * Only trust it if it has the right number of entries.
1540 if (dsl_dataset_phys(ds
)->ds_next_clones_obj
!= 0) {
1541 VERIFY0(zap_count(mos
, dsl_dataset_phys(ds
)->ds_next_clones_obj
,
1544 if (count
!= dsl_dataset_phys(ds
)->ds_num_children
- 1)
1546 for (zap_cursor_init(&zc
, mos
,
1547 dsl_dataset_phys(ds
)->ds_next_clones_obj
);
1548 zap_cursor_retrieve(&zc
, &za
) == 0;
1549 zap_cursor_advance(&zc
)) {
1550 dsl_dataset_t
*clone
;
1551 char buf
[ZFS_MAXNAMELEN
];
1552 VERIFY0(dsl_dataset_hold_obj(ds
->ds_dir
->dd_pool
,
1553 za
.za_first_integer
, FTAG
, &clone
));
1554 dsl_dir_name(clone
->ds_dir
, buf
);
1555 fnvlist_add_boolean(val
, buf
);
1556 dsl_dataset_rele(clone
, FTAG
);
1558 zap_cursor_fini(&zc
);
1559 fnvlist_add_nvlist(propval
, ZPROP_VALUE
, val
);
1560 fnvlist_add_nvlist(nv
, zfs_prop_to_name(ZFS_PROP_CLONES
), propval
);
1563 nvlist_free(propval
);
1567 dsl_dataset_stats(dsl_dataset_t
*ds
, nvlist_t
*nv
)
1569 uint64_t refd
, avail
, uobjs
, aobjs
, ratio
;
1570 ASSERTV(dsl_pool_t
*dp
= ds
->ds_dir
->dd_pool
);
1572 ASSERT(dsl_pool_config_held(dp
));
1574 ratio
= dsl_dataset_phys(ds
)->ds_compressed_bytes
== 0 ? 100 :
1575 (dsl_dataset_phys(ds
)->ds_uncompressed_bytes
* 100 /
1576 dsl_dataset_phys(ds
)->ds_compressed_bytes
);
1578 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_REFRATIO
, ratio
);
1579 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_LOGICALREFERENCED
,
1580 dsl_dataset_phys(ds
)->ds_uncompressed_bytes
);
1582 if (dsl_dataset_is_snapshot(ds
)) {
1583 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_COMPRESSRATIO
, ratio
);
1584 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_USED
,
1585 dsl_dataset_phys(ds
)->ds_unique_bytes
);
1586 get_clones_stat(ds
, nv
);
1588 dsl_dir_stats(ds
->ds_dir
, nv
);
1591 dsl_dataset_space(ds
, &refd
, &avail
, &uobjs
, &aobjs
);
1592 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_AVAILABLE
, avail
);
1593 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_REFERENCED
, refd
);
1595 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_CREATION
,
1596 dsl_dataset_phys(ds
)->ds_creation_time
);
1597 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_CREATETXG
,
1598 dsl_dataset_phys(ds
)->ds_creation_txg
);
1599 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_REFQUOTA
,
1601 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_REFRESERVATION
,
1603 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_GUID
,
1604 dsl_dataset_phys(ds
)->ds_guid
);
1605 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_UNIQUE
,
1606 dsl_dataset_phys(ds
)->ds_unique_bytes
);
1607 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_OBJSETID
,
1609 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_USERREFS
,
1611 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_DEFER_DESTROY
,
1612 DS_IS_DEFER_DESTROY(ds
) ? 1 : 0);
1614 if (dsl_dataset_phys(ds
)->ds_prev_snap_obj
!= 0) {
1615 uint64_t written
, comp
, uncomp
;
1616 dsl_pool_t
*dp
= ds
->ds_dir
->dd_pool
;
1617 dsl_dataset_t
*prev
;
1620 err
= dsl_dataset_hold_obj(dp
,
1621 dsl_dataset_phys(ds
)->ds_prev_snap_obj
, FTAG
, &prev
);
1623 err
= dsl_dataset_space_written(prev
, ds
, &written
,
1625 dsl_dataset_rele(prev
, FTAG
);
1627 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_WRITTEN
,
1636 dsl_dataset_fast_stat(dsl_dataset_t
*ds
, dmu_objset_stats_t
*stat
)
1638 dsl_pool_t
*dp
= ds
->ds_dir
->dd_pool
;
1639 ASSERT(dsl_pool_config_held(dp
));
1641 stat
->dds_creation_txg
= dsl_dataset_phys(ds
)->ds_creation_txg
;
1642 stat
->dds_inconsistent
=
1643 dsl_dataset_phys(ds
)->ds_flags
& DS_FLAG_INCONSISTENT
;
1644 stat
->dds_guid
= dsl_dataset_phys(ds
)->ds_guid
;
1645 stat
->dds_origin
[0] = '\0';
1646 if (dsl_dataset_is_snapshot(ds
)) {
1647 stat
->dds_is_snapshot
= B_TRUE
;
1648 stat
->dds_num_clones
=
1649 dsl_dataset_phys(ds
)->ds_num_children
- 1;
1651 stat
->dds_is_snapshot
= B_FALSE
;
1652 stat
->dds_num_clones
= 0;
1654 if (dsl_dir_is_clone(ds
->ds_dir
)) {
1657 VERIFY0(dsl_dataset_hold_obj(dp
,
1658 dsl_dir_phys(ds
->ds_dir
)->dd_origin_obj
,
1660 dsl_dataset_name(ods
, stat
->dds_origin
);
1661 dsl_dataset_rele(ods
, FTAG
);
1667 dsl_dataset_fsid_guid(dsl_dataset_t
*ds
)
1669 return (ds
->ds_fsid_guid
);
1673 dsl_dataset_space(dsl_dataset_t
*ds
,
1674 uint64_t *refdbytesp
, uint64_t *availbytesp
,
1675 uint64_t *usedobjsp
, uint64_t *availobjsp
)
1677 *refdbytesp
= dsl_dataset_phys(ds
)->ds_referenced_bytes
;
1678 *availbytesp
= dsl_dir_space_available(ds
->ds_dir
, NULL
, 0, TRUE
);
1679 if (ds
->ds_reserved
> dsl_dataset_phys(ds
)->ds_unique_bytes
)
1681 ds
->ds_reserved
- dsl_dataset_phys(ds
)->ds_unique_bytes
;
1682 if (ds
->ds_quota
!= 0) {
1684 * Adjust available bytes according to refquota
1686 if (*refdbytesp
< ds
->ds_quota
)
1687 *availbytesp
= MIN(*availbytesp
,
1688 ds
->ds_quota
- *refdbytesp
);
1692 *usedobjsp
= BP_GET_FILL(&dsl_dataset_phys(ds
)->ds_bp
);
1693 *availobjsp
= DN_MAX_OBJECT
- *usedobjsp
;
1697 dsl_dataset_modified_since_snap(dsl_dataset_t
*ds
, dsl_dataset_t
*snap
)
1699 ASSERT(dsl_pool_config_held(ds
->ds_dir
->dd_pool
));
1702 if (dsl_dataset_phys(ds
)->ds_bp
.blk_birth
>
1703 dsl_dataset_phys(snap
)->ds_creation_txg
) {
1704 objset_t
*os
, *os_snap
;
1706 * It may be that only the ZIL differs, because it was
1707 * reset in the head. Don't count that as being
1710 if (dmu_objset_from_ds(ds
, &os
) != 0)
1712 if (dmu_objset_from_ds(snap
, &os_snap
) != 0)
1714 return (bcmp(&os
->os_phys
->os_meta_dnode
,
1715 &os_snap
->os_phys
->os_meta_dnode
,
1716 sizeof (os
->os_phys
->os_meta_dnode
)) != 0);
1721 typedef struct dsl_dataset_rename_snapshot_arg
{
1722 const char *ddrsa_fsname
;
1723 const char *ddrsa_oldsnapname
;
1724 const char *ddrsa_newsnapname
;
1725 boolean_t ddrsa_recursive
;
1727 } dsl_dataset_rename_snapshot_arg_t
;
1731 dsl_dataset_rename_snapshot_check_impl(dsl_pool_t
*dp
,
1732 dsl_dataset_t
*hds
, void *arg
)
1734 dsl_dataset_rename_snapshot_arg_t
*ddrsa
= arg
;
1738 error
= dsl_dataset_snap_lookup(hds
, ddrsa
->ddrsa_oldsnapname
, &val
);
1740 /* ignore nonexistent snapshots */
1741 return (error
== ENOENT
? 0 : error
);
1744 /* new name should not exist */
1745 error
= dsl_dataset_snap_lookup(hds
, ddrsa
->ddrsa_newsnapname
, &val
);
1747 error
= SET_ERROR(EEXIST
);
1748 else if (error
== ENOENT
)
1751 /* dataset name + 1 for the "@" + the new snapshot name must fit */
1752 if (dsl_dir_namelen(hds
->ds_dir
) + 1 +
1753 strlen(ddrsa
->ddrsa_newsnapname
) >= MAXNAMELEN
)
1754 error
= SET_ERROR(ENAMETOOLONG
);
1760 dsl_dataset_rename_snapshot_check(void *arg
, dmu_tx_t
*tx
)
1762 dsl_dataset_rename_snapshot_arg_t
*ddrsa
= arg
;
1763 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
1767 error
= dsl_dataset_hold(dp
, ddrsa
->ddrsa_fsname
, FTAG
, &hds
);
1771 if (ddrsa
->ddrsa_recursive
) {
1772 error
= dmu_objset_find_dp(dp
, hds
->ds_dir
->dd_object
,
1773 dsl_dataset_rename_snapshot_check_impl
, ddrsa
,
1776 error
= dsl_dataset_rename_snapshot_check_impl(dp
, hds
, ddrsa
);
1778 dsl_dataset_rele(hds
, FTAG
);
1783 dsl_dataset_rename_snapshot_sync_impl(dsl_pool_t
*dp
,
1784 dsl_dataset_t
*hds
, void *arg
)
1786 dsl_dataset_rename_snapshot_arg_t
*ddrsa
= arg
;
1789 dmu_tx_t
*tx
= ddrsa
->ddrsa_tx
;
1792 error
= dsl_dataset_snap_lookup(hds
, ddrsa
->ddrsa_oldsnapname
, &val
);
1793 ASSERT(error
== 0 || error
== ENOENT
);
1794 if (error
== ENOENT
) {
1795 /* ignore nonexistent snapshots */
1799 VERIFY0(dsl_dataset_hold_obj(dp
, val
, FTAG
, &ds
));
1801 /* log before we change the name */
1802 spa_history_log_internal_ds(ds
, "rename", tx
,
1803 "-> @%s", ddrsa
->ddrsa_newsnapname
);
1805 VERIFY0(dsl_dataset_snap_remove(hds
, ddrsa
->ddrsa_oldsnapname
, tx
,
1807 mutex_enter(&ds
->ds_lock
);
1808 (void) strcpy(ds
->ds_snapname
, ddrsa
->ddrsa_newsnapname
);
1809 mutex_exit(&ds
->ds_lock
);
1810 VERIFY0(zap_add(dp
->dp_meta_objset
,
1811 dsl_dataset_phys(hds
)->ds_snapnames_zapobj
,
1812 ds
->ds_snapname
, 8, 1, &ds
->ds_object
, tx
));
1814 dsl_dataset_rele(ds
, FTAG
);
1819 dsl_dataset_rename_snapshot_sync(void *arg
, dmu_tx_t
*tx
)
1821 dsl_dataset_rename_snapshot_arg_t
*ddrsa
= arg
;
1822 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
1825 VERIFY0(dsl_dataset_hold(dp
, ddrsa
->ddrsa_fsname
, FTAG
, &hds
));
1826 ddrsa
->ddrsa_tx
= tx
;
1827 if (ddrsa
->ddrsa_recursive
) {
1828 VERIFY0(dmu_objset_find_dp(dp
, hds
->ds_dir
->dd_object
,
1829 dsl_dataset_rename_snapshot_sync_impl
, ddrsa
,
1832 VERIFY0(dsl_dataset_rename_snapshot_sync_impl(dp
, hds
, ddrsa
));
1834 dsl_dataset_rele(hds
, FTAG
);
1838 dsl_dataset_rename_snapshot(const char *fsname
,
1839 const char *oldsnapname
, const char *newsnapname
, boolean_t recursive
)
1842 char *oldname
, *newname
;
1846 dsl_dataset_rename_snapshot_arg_t ddrsa
;
1848 ddrsa
.ddrsa_fsname
= fsname
;
1849 ddrsa
.ddrsa_oldsnapname
= oldsnapname
;
1850 ddrsa
.ddrsa_newsnapname
= newsnapname
;
1851 ddrsa
.ddrsa_recursive
= recursive
;
1853 error
= dsl_sync_task(fsname
, dsl_dataset_rename_snapshot_check
,
1854 dsl_dataset_rename_snapshot_sync
, &ddrsa
, 1);
1857 return (SET_ERROR(error
));
1860 oldname
= kmem_asprintf("%s@%s", fsname
, oldsnapname
);
1861 newname
= kmem_asprintf("%s@%s", fsname
, newsnapname
);
1862 zvol_rename_minors(oldname
, newname
);
1871 * If we're doing an ownership handoff, we need to make sure that there is
1872 * only one long hold on the dataset. We're not allowed to change anything here
1873 * so we don't permanently release the long hold or regular hold here. We want
1874 * to do this only when syncing to avoid the dataset unexpectedly going away
1875 * when we release the long hold.
1878 dsl_dataset_handoff_check(dsl_dataset_t
*ds
, void *owner
, dmu_tx_t
*tx
)
1882 if (!dmu_tx_is_syncing(tx
))
1885 if (owner
!= NULL
) {
1886 VERIFY3P(ds
->ds_owner
, ==, owner
);
1887 dsl_dataset_long_rele(ds
, owner
);
1890 held
= dsl_dataset_long_held(ds
);
1893 dsl_dataset_long_hold(ds
, owner
);
1896 return (SET_ERROR(EBUSY
));
1901 typedef struct dsl_dataset_rollback_arg
{
1902 const char *ddra_fsname
;
1904 nvlist_t
*ddra_result
;
1905 } dsl_dataset_rollback_arg_t
;
1908 dsl_dataset_rollback_check(void *arg
, dmu_tx_t
*tx
)
1910 dsl_dataset_rollback_arg_t
*ddra
= arg
;
1911 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
1913 int64_t unused_refres_delta
;
1916 nvlist_t
*proprequest
, *bookmarks
;
1918 error
= dsl_dataset_hold(dp
, ddra
->ddra_fsname
, FTAG
, &ds
);
1922 /* must not be a snapshot */
1923 if (dsl_dataset_is_snapshot(ds
)) {
1924 dsl_dataset_rele(ds
, FTAG
);
1925 return (SET_ERROR(EINVAL
));
1928 /* must have a most recent snapshot */
1929 if (dsl_dataset_phys(ds
)->ds_prev_snap_txg
< TXG_INITIAL
) {
1930 dsl_dataset_rele(ds
, FTAG
);
1931 return (SET_ERROR(EINVAL
));
1934 /* must not have any bookmarks after the most recent snapshot */
1935 proprequest
= fnvlist_alloc();
1936 fnvlist_add_boolean(proprequest
, zfs_prop_to_name(ZFS_PROP_CREATETXG
));
1937 bookmarks
= fnvlist_alloc();
1938 error
= dsl_get_bookmarks_impl(ds
, proprequest
, bookmarks
);
1939 fnvlist_free(proprequest
);
1942 for (pair
= nvlist_next_nvpair(bookmarks
, NULL
);
1943 pair
!= NULL
; pair
= nvlist_next_nvpair(bookmarks
, pair
)) {
1945 fnvlist_lookup_nvlist(fnvpair_value_nvlist(pair
),
1946 zfs_prop_to_name(ZFS_PROP_CREATETXG
));
1947 uint64_t createtxg
= fnvlist_lookup_uint64(valuenv
, "value");
1948 if (createtxg
> dsl_dataset_phys(ds
)->ds_prev_snap_txg
) {
1949 fnvlist_free(bookmarks
);
1950 dsl_dataset_rele(ds
, FTAG
);
1951 return (SET_ERROR(EEXIST
));
1954 fnvlist_free(bookmarks
);
1956 error
= dsl_dataset_handoff_check(ds
, ddra
->ddra_owner
, tx
);
1958 dsl_dataset_rele(ds
, FTAG
);
1963 * Check if the snap we are rolling back to uses more than
1966 if (ds
->ds_quota
!= 0 &&
1967 dsl_dataset_phys(ds
->ds_prev
)->ds_referenced_bytes
> ds
->ds_quota
) {
1968 dsl_dataset_rele(ds
, FTAG
);
1969 return (SET_ERROR(EDQUOT
));
1973 * When we do the clone swap, we will temporarily use more space
1974 * due to the refreservation (the head will no longer have any
1975 * unique space, so the entire amount of the refreservation will need
1976 * to be free). We will immediately destroy the clone, freeing
1977 * this space, but the freeing happens over many txg's.
1979 unused_refres_delta
= (int64_t)MIN(ds
->ds_reserved
,
1980 dsl_dataset_phys(ds
)->ds_unique_bytes
);
1982 if (unused_refres_delta
> 0 &&
1983 unused_refres_delta
>
1984 dsl_dir_space_available(ds
->ds_dir
, NULL
, 0, TRUE
)) {
1985 dsl_dataset_rele(ds
, FTAG
);
1986 return (SET_ERROR(ENOSPC
));
1989 dsl_dataset_rele(ds
, FTAG
);
1994 dsl_dataset_rollback_sync(void *arg
, dmu_tx_t
*tx
)
1996 dsl_dataset_rollback_arg_t
*ddra
= arg
;
1997 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
1998 dsl_dataset_t
*ds
, *clone
;
2000 char namebuf
[ZFS_MAXNAMELEN
];
2002 VERIFY0(dsl_dataset_hold(dp
, ddra
->ddra_fsname
, FTAG
, &ds
));
2004 dsl_dataset_name(ds
->ds_prev
, namebuf
);
2005 fnvlist_add_string(ddra
->ddra_result
, "target", namebuf
);
2007 cloneobj
= dsl_dataset_create_sync(ds
->ds_dir
, "%rollback",
2008 ds
->ds_prev
, DS_CREATE_FLAG_NODIRTY
, kcred
, tx
);
2010 VERIFY0(dsl_dataset_hold_obj(dp
, cloneobj
, FTAG
, &clone
));
2012 dsl_dataset_clone_swap_sync_impl(clone
, ds
, tx
);
2013 dsl_dataset_zero_zil(ds
, tx
);
2015 dsl_destroy_head_sync_impl(clone
, tx
);
2017 dsl_dataset_rele(clone
, FTAG
);
2018 dsl_dataset_rele(ds
, FTAG
);
2022 * Rolls back the given filesystem or volume to the most recent snapshot.
2023 * The name of the most recent snapshot will be returned under key "target"
2024 * in the result nvlist.
2027 * - The existing dataset MUST be owned by the specified owner at entry
2028 * - Upon return, dataset will still be held by the same owner, whether we
2031 * This mode is required any time the existing filesystem is mounted. See
2032 * notes above zfs_suspend_fs() for further details.
2035 dsl_dataset_rollback(const char *fsname
, void *owner
, nvlist_t
*result
)
2037 dsl_dataset_rollback_arg_t ddra
;
2039 ddra
.ddra_fsname
= fsname
;
2040 ddra
.ddra_owner
= owner
;
2041 ddra
.ddra_result
= result
;
2043 return (dsl_sync_task(fsname
, dsl_dataset_rollback_check
,
2044 dsl_dataset_rollback_sync
, &ddra
, 1));
2047 struct promotenode
{
2052 typedef struct dsl_dataset_promote_arg
{
2053 const char *ddpa_clonename
;
2054 dsl_dataset_t
*ddpa_clone
;
2055 list_t shared_snaps
, origin_snaps
, clone_snaps
;
2056 dsl_dataset_t
*origin_origin
; /* origin of the origin */
2057 uint64_t used
, comp
, uncomp
, unique
, cloneusedsnap
, originusedsnap
;
2060 } dsl_dataset_promote_arg_t
;
2062 static int snaplist_space(list_t
*l
, uint64_t mintxg
, uint64_t *spacep
);
2063 static int promote_hold(dsl_dataset_promote_arg_t
*ddpa
, dsl_pool_t
*dp
,
2065 static void promote_rele(dsl_dataset_promote_arg_t
*ddpa
, void *tag
);
2068 dsl_dataset_promote_check(void *arg
, dmu_tx_t
*tx
)
2070 dsl_dataset_promote_arg_t
*ddpa
= arg
;
2071 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
2073 struct promotenode
*snap
;
2074 dsl_dataset_t
*origin_ds
;
2079 err
= promote_hold(ddpa
, dp
, FTAG
);
2083 hds
= ddpa
->ddpa_clone
;
2085 if (dsl_dataset_phys(hds
)->ds_flags
& DS_FLAG_NOPROMOTE
) {
2086 promote_rele(ddpa
, FTAG
);
2087 return (SET_ERROR(EXDEV
));
2091 * Compute and check the amount of space to transfer. Since this is
2092 * so expensive, don't do the preliminary check.
2094 if (!dmu_tx_is_syncing(tx
)) {
2095 promote_rele(ddpa
, FTAG
);
2099 snap
= list_head(&ddpa
->shared_snaps
);
2100 origin_ds
= snap
->ds
;
2102 /* compute origin's new unique space */
2103 snap
= list_tail(&ddpa
->clone_snaps
);
2104 ASSERT3U(dsl_dataset_phys(snap
->ds
)->ds_prev_snap_obj
, ==,
2105 origin_ds
->ds_object
);
2106 dsl_deadlist_space_range(&snap
->ds
->ds_deadlist
,
2107 dsl_dataset_phys(origin_ds
)->ds_prev_snap_txg
, UINT64_MAX
,
2108 &ddpa
->unique
, &unused
, &unused
);
2111 * Walk the snapshots that we are moving
2113 * Compute space to transfer. Consider the incremental changes
2114 * to used by each snapshot:
2115 * (my used) = (prev's used) + (blocks born) - (blocks killed)
2116 * So each snapshot gave birth to:
2117 * (blocks born) = (my used) - (prev's used) + (blocks killed)
2118 * So a sequence would look like:
2119 * (uN - u(N-1) + kN) + ... + (u1 - u0 + k1) + (u0 - 0 + k0)
2120 * Which simplifies to:
2121 * uN + kN + kN-1 + ... + k1 + k0
2122 * Note however, if we stop before we reach the ORIGIN we get:
2123 * uN + kN + kN-1 + ... + kM - uM-1
2126 ddpa
->used
= dsl_dataset_phys(origin_ds
)->ds_referenced_bytes
;
2127 ddpa
->comp
= dsl_dataset_phys(origin_ds
)->ds_compressed_bytes
;
2128 ddpa
->uncomp
= dsl_dataset_phys(origin_ds
)->ds_uncompressed_bytes
;
2129 for (snap
= list_head(&ddpa
->shared_snaps
); snap
;
2130 snap
= list_next(&ddpa
->shared_snaps
, snap
)) {
2131 uint64_t val
, dlused
, dlcomp
, dluncomp
;
2132 dsl_dataset_t
*ds
= snap
->ds
;
2137 * If there are long holds, we won't be able to evict
2140 if (dsl_dataset_long_held(ds
)) {
2141 err
= SET_ERROR(EBUSY
);
2145 /* Check that the snapshot name does not conflict */
2146 VERIFY0(dsl_dataset_get_snapname(ds
));
2147 err
= dsl_dataset_snap_lookup(hds
, ds
->ds_snapname
, &val
);
2149 (void) strcpy(ddpa
->err_ds
, snap
->ds
->ds_snapname
);
2150 err
= SET_ERROR(EEXIST
);
2156 /* The very first snapshot does not have a deadlist */
2157 if (dsl_dataset_phys(ds
)->ds_prev_snap_obj
== 0)
2160 dsl_deadlist_space(&ds
->ds_deadlist
,
2161 &dlused
, &dlcomp
, &dluncomp
);
2162 ddpa
->used
+= dlused
;
2163 ddpa
->comp
+= dlcomp
;
2164 ddpa
->uncomp
+= dluncomp
;
2168 * If we are a clone of a clone then we never reached ORIGIN,
2169 * so we need to subtract out the clone origin's used space.
2171 if (ddpa
->origin_origin
) {
2173 dsl_dataset_phys(ddpa
->origin_origin
)->ds_referenced_bytes
;
2175 dsl_dataset_phys(ddpa
->origin_origin
)->ds_compressed_bytes
;
2177 dsl_dataset_phys(ddpa
->origin_origin
)->
2178 ds_uncompressed_bytes
;
2181 /* Check that there is enough space and limit headroom here */
2182 err
= dsl_dir_transfer_possible(origin_ds
->ds_dir
, hds
->ds_dir
,
2183 0, ss_mv_cnt
, ddpa
->used
, ddpa
->cr
);
2188 * Compute the amounts of space that will be used by snapshots
2189 * after the promotion (for both origin and clone). For each,
2190 * it is the amount of space that will be on all of their
2191 * deadlists (that was not born before their new origin).
2193 if (dsl_dir_phys(hds
->ds_dir
)->dd_flags
& DD_FLAG_USED_BREAKDOWN
) {
2197 * Note, typically this will not be a clone of a clone,
2198 * so dd_origin_txg will be < TXG_INITIAL, so
2199 * these snaplist_space() -> dsl_deadlist_space_range()
2200 * calls will be fast because they do not have to
2201 * iterate over all bps.
2203 snap
= list_head(&ddpa
->origin_snaps
);
2204 err
= snaplist_space(&ddpa
->shared_snaps
,
2205 snap
->ds
->ds_dir
->dd_origin_txg
, &ddpa
->cloneusedsnap
);
2209 err
= snaplist_space(&ddpa
->clone_snaps
,
2210 snap
->ds
->ds_dir
->dd_origin_txg
, &space
);
2213 ddpa
->cloneusedsnap
+= space
;
2215 if (dsl_dir_phys(origin_ds
->ds_dir
)->dd_flags
&
2216 DD_FLAG_USED_BREAKDOWN
) {
2217 err
= snaplist_space(&ddpa
->origin_snaps
,
2218 dsl_dataset_phys(origin_ds
)->ds_creation_txg
,
2219 &ddpa
->originusedsnap
);
2225 promote_rele(ddpa
, FTAG
);
2230 dsl_dataset_promote_sync(void *arg
, dmu_tx_t
*tx
)
2232 dsl_dataset_promote_arg_t
*ddpa
= arg
;
2233 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
2235 struct promotenode
*snap
;
2236 dsl_dataset_t
*origin_ds
;
2237 dsl_dataset_t
*origin_head
;
2239 dsl_dir_t
*odd
= NULL
;
2240 uint64_t oldnext_obj
;
2243 VERIFY0(promote_hold(ddpa
, dp
, FTAG
));
2244 hds
= ddpa
->ddpa_clone
;
2246 ASSERT0(dsl_dataset_phys(hds
)->ds_flags
& DS_FLAG_NOPROMOTE
);
2248 snap
= list_head(&ddpa
->shared_snaps
);
2249 origin_ds
= snap
->ds
;
2252 snap
= list_head(&ddpa
->origin_snaps
);
2253 origin_head
= snap
->ds
;
2256 * We need to explicitly open odd, since origin_ds's dd will be
2259 VERIFY0(dsl_dir_hold_obj(dp
, origin_ds
->ds_dir
->dd_object
,
2262 /* change origin's next snap */
2263 dmu_buf_will_dirty(origin_ds
->ds_dbuf
, tx
);
2264 oldnext_obj
= dsl_dataset_phys(origin_ds
)->ds_next_snap_obj
;
2265 snap
= list_tail(&ddpa
->clone_snaps
);
2266 ASSERT3U(dsl_dataset_phys(snap
->ds
)->ds_prev_snap_obj
, ==,
2267 origin_ds
->ds_object
);
2268 dsl_dataset_phys(origin_ds
)->ds_next_snap_obj
= snap
->ds
->ds_object
;
2270 /* change the origin's next clone */
2271 if (dsl_dataset_phys(origin_ds
)->ds_next_clones_obj
) {
2272 dsl_dataset_remove_from_next_clones(origin_ds
,
2273 snap
->ds
->ds_object
, tx
);
2274 VERIFY0(zap_add_int(dp
->dp_meta_objset
,
2275 dsl_dataset_phys(origin_ds
)->ds_next_clones_obj
,
2280 dmu_buf_will_dirty(dd
->dd_dbuf
, tx
);
2281 ASSERT3U(dsl_dir_phys(dd
)->dd_origin_obj
, ==, origin_ds
->ds_object
);
2282 dsl_dir_phys(dd
)->dd_origin_obj
= dsl_dir_phys(odd
)->dd_origin_obj
;
2283 dd
->dd_origin_txg
= origin_head
->ds_dir
->dd_origin_txg
;
2284 dmu_buf_will_dirty(odd
->dd_dbuf
, tx
);
2285 dsl_dir_phys(odd
)->dd_origin_obj
= origin_ds
->ds_object
;
2286 origin_head
->ds_dir
->dd_origin_txg
=
2287 dsl_dataset_phys(origin_ds
)->ds_creation_txg
;
2289 /* change dd_clone entries */
2290 if (spa_version(dp
->dp_spa
) >= SPA_VERSION_DIR_CLONES
) {
2291 VERIFY0(zap_remove_int(dp
->dp_meta_objset
,
2292 dsl_dir_phys(odd
)->dd_clones
, hds
->ds_object
, tx
));
2293 VERIFY0(zap_add_int(dp
->dp_meta_objset
,
2294 dsl_dir_phys(ddpa
->origin_origin
->ds_dir
)->dd_clones
,
2295 hds
->ds_object
, tx
));
2297 VERIFY0(zap_remove_int(dp
->dp_meta_objset
,
2298 dsl_dir_phys(ddpa
->origin_origin
->ds_dir
)->dd_clones
,
2299 origin_head
->ds_object
, tx
));
2300 if (dsl_dir_phys(dd
)->dd_clones
== 0) {
2301 dsl_dir_phys(dd
)->dd_clones
=
2302 zap_create(dp
->dp_meta_objset
, DMU_OT_DSL_CLONES
,
2303 DMU_OT_NONE
, 0, tx
);
2305 VERIFY0(zap_add_int(dp
->dp_meta_objset
,
2306 dsl_dir_phys(dd
)->dd_clones
, origin_head
->ds_object
, tx
));
2309 /* move snapshots to this dir */
2310 for (snap
= list_head(&ddpa
->shared_snaps
); snap
;
2311 snap
= list_next(&ddpa
->shared_snaps
, snap
)) {
2312 dsl_dataset_t
*ds
= snap
->ds
;
2315 * Property callbacks are registered to a particular
2316 * dsl_dir. Since ours is changing, evict the objset
2317 * so that they will be unregistered from the old dsl_dir.
2319 if (ds
->ds_objset
) {
2320 dmu_objset_evict(ds
->ds_objset
);
2321 ds
->ds_objset
= NULL
;
2324 /* move snap name entry */
2325 VERIFY0(dsl_dataset_get_snapname(ds
));
2326 VERIFY0(dsl_dataset_snap_remove(origin_head
,
2327 ds
->ds_snapname
, tx
, B_TRUE
));
2328 VERIFY0(zap_add(dp
->dp_meta_objset
,
2329 dsl_dataset_phys(hds
)->ds_snapnames_zapobj
, ds
->ds_snapname
,
2330 8, 1, &ds
->ds_object
, tx
));
2331 dsl_fs_ss_count_adjust(hds
->ds_dir
, 1,
2332 DD_FIELD_SNAPSHOT_COUNT
, tx
);
2334 /* change containing dsl_dir */
2335 dmu_buf_will_dirty(ds
->ds_dbuf
, tx
);
2336 ASSERT3U(dsl_dataset_phys(ds
)->ds_dir_obj
, ==, odd
->dd_object
);
2337 dsl_dataset_phys(ds
)->ds_dir_obj
= dd
->dd_object
;
2338 ASSERT3P(ds
->ds_dir
, ==, odd
);
2339 dsl_dir_rele(ds
->ds_dir
, ds
);
2340 VERIFY0(dsl_dir_hold_obj(dp
, dd
->dd_object
,
2341 NULL
, ds
, &ds
->ds_dir
));
2343 /* move any clone references */
2344 if (dsl_dataset_phys(ds
)->ds_next_clones_obj
&&
2345 spa_version(dp
->dp_spa
) >= SPA_VERSION_DIR_CLONES
) {
2349 for (zap_cursor_init(&zc
, dp
->dp_meta_objset
,
2350 dsl_dataset_phys(ds
)->ds_next_clones_obj
);
2351 zap_cursor_retrieve(&zc
, &za
) == 0;
2352 zap_cursor_advance(&zc
)) {
2353 dsl_dataset_t
*cnds
;
2356 if (za
.za_first_integer
== oldnext_obj
) {
2358 * We've already moved the
2359 * origin's reference.
2364 VERIFY0(dsl_dataset_hold_obj(dp
,
2365 za
.za_first_integer
, FTAG
, &cnds
));
2366 o
= dsl_dir_phys(cnds
->ds_dir
)->
2367 dd_head_dataset_obj
;
2369 VERIFY0(zap_remove_int(dp
->dp_meta_objset
,
2370 dsl_dir_phys(odd
)->dd_clones
, o
, tx
));
2371 VERIFY0(zap_add_int(dp
->dp_meta_objset
,
2372 dsl_dir_phys(dd
)->dd_clones
, o
, tx
));
2373 dsl_dataset_rele(cnds
, FTAG
);
2375 zap_cursor_fini(&zc
);
2378 ASSERT(!dsl_prop_hascb(ds
));
2382 * Change space accounting.
2383 * Note, pa->*usedsnap and dd_used_breakdown[SNAP] will either
2384 * both be valid, or both be 0 (resulting in delta == 0). This
2385 * is true for each of {clone,origin} independently.
2388 delta
= ddpa
->cloneusedsnap
-
2389 dsl_dir_phys(dd
)->dd_used_breakdown
[DD_USED_SNAP
];
2390 ASSERT3S(delta
, >=, 0);
2391 ASSERT3U(ddpa
->used
, >=, delta
);
2392 dsl_dir_diduse_space(dd
, DD_USED_SNAP
, delta
, 0, 0, tx
);
2393 dsl_dir_diduse_space(dd
, DD_USED_HEAD
,
2394 ddpa
->used
- delta
, ddpa
->comp
, ddpa
->uncomp
, tx
);
2396 delta
= ddpa
->originusedsnap
-
2397 dsl_dir_phys(odd
)->dd_used_breakdown
[DD_USED_SNAP
];
2398 ASSERT3S(delta
, <=, 0);
2399 ASSERT3U(ddpa
->used
, >=, -delta
);
2400 dsl_dir_diduse_space(odd
, DD_USED_SNAP
, delta
, 0, 0, tx
);
2401 dsl_dir_diduse_space(odd
, DD_USED_HEAD
,
2402 -ddpa
->used
- delta
, -ddpa
->comp
, -ddpa
->uncomp
, tx
);
2404 dsl_dataset_phys(origin_ds
)->ds_unique_bytes
= ddpa
->unique
;
2406 /* log history record */
2407 spa_history_log_internal_ds(hds
, "promote", tx
, "");
2409 dsl_dir_rele(odd
, FTAG
);
2410 promote_rele(ddpa
, FTAG
);
2414 * Make a list of dsl_dataset_t's for the snapshots between first_obj
2415 * (exclusive) and last_obj (inclusive). The list will be in reverse
2416 * order (last_obj will be the list_head()). If first_obj == 0, do all
2417 * snapshots back to this dataset's origin.
2420 snaplist_make(dsl_pool_t
*dp
,
2421 uint64_t first_obj
, uint64_t last_obj
, list_t
*l
, void *tag
)
2423 uint64_t obj
= last_obj
;
2425 list_create(l
, sizeof (struct promotenode
),
2426 offsetof(struct promotenode
, link
));
2428 while (obj
!= first_obj
) {
2430 struct promotenode
*snap
;
2433 err
= dsl_dataset_hold_obj(dp
, obj
, tag
, &ds
);
2434 ASSERT(err
!= ENOENT
);
2439 first_obj
= dsl_dir_phys(ds
->ds_dir
)->dd_origin_obj
;
2441 snap
= kmem_alloc(sizeof (*snap
), KM_SLEEP
);
2443 list_insert_tail(l
, snap
);
2444 obj
= dsl_dataset_phys(ds
)->ds_prev_snap_obj
;
2451 snaplist_space(list_t
*l
, uint64_t mintxg
, uint64_t *spacep
)
2453 struct promotenode
*snap
;
2456 for (snap
= list_head(l
); snap
; snap
= list_next(l
, snap
)) {
2457 uint64_t used
, comp
, uncomp
;
2458 dsl_deadlist_space_range(&snap
->ds
->ds_deadlist
,
2459 mintxg
, UINT64_MAX
, &used
, &comp
, &uncomp
);
2466 snaplist_destroy(list_t
*l
, void *tag
)
2468 struct promotenode
*snap
;
2470 if (l
== NULL
|| !list_link_active(&l
->list_head
))
2473 while ((snap
= list_tail(l
)) != NULL
) {
2474 list_remove(l
, snap
);
2475 dsl_dataset_rele(snap
->ds
, tag
);
2476 kmem_free(snap
, sizeof (*snap
));
2482 promote_hold(dsl_dataset_promote_arg_t
*ddpa
, dsl_pool_t
*dp
, void *tag
)
2486 struct promotenode
*snap
;
2488 error
= dsl_dataset_hold(dp
, ddpa
->ddpa_clonename
, tag
,
2492 dd
= ddpa
->ddpa_clone
->ds_dir
;
2494 if (dsl_dataset_is_snapshot(ddpa
->ddpa_clone
) ||
2495 !dsl_dir_is_clone(dd
)) {
2496 dsl_dataset_rele(ddpa
->ddpa_clone
, tag
);
2497 return (SET_ERROR(EINVAL
));
2500 error
= snaplist_make(dp
, 0, dsl_dir_phys(dd
)->dd_origin_obj
,
2501 &ddpa
->shared_snaps
, tag
);
2505 error
= snaplist_make(dp
, 0, ddpa
->ddpa_clone
->ds_object
,
2506 &ddpa
->clone_snaps
, tag
);
2510 snap
= list_head(&ddpa
->shared_snaps
);
2511 ASSERT3U(snap
->ds
->ds_object
, ==, dsl_dir_phys(dd
)->dd_origin_obj
);
2512 error
= snaplist_make(dp
, dsl_dir_phys(dd
)->dd_origin_obj
,
2513 dsl_dir_phys(snap
->ds
->ds_dir
)->dd_head_dataset_obj
,
2514 &ddpa
->origin_snaps
, tag
);
2518 if (dsl_dir_phys(snap
->ds
->ds_dir
)->dd_origin_obj
!= 0) {
2519 error
= dsl_dataset_hold_obj(dp
,
2520 dsl_dir_phys(snap
->ds
->ds_dir
)->dd_origin_obj
,
2521 tag
, &ddpa
->origin_origin
);
2527 promote_rele(ddpa
, tag
);
2532 promote_rele(dsl_dataset_promote_arg_t
*ddpa
, void *tag
)
2534 snaplist_destroy(&ddpa
->shared_snaps
, tag
);
2535 snaplist_destroy(&ddpa
->clone_snaps
, tag
);
2536 snaplist_destroy(&ddpa
->origin_snaps
, tag
);
2537 if (ddpa
->origin_origin
!= NULL
)
2538 dsl_dataset_rele(ddpa
->origin_origin
, tag
);
2539 dsl_dataset_rele(ddpa
->ddpa_clone
, tag
);
2545 * If it fails due to a conflicting snapshot name, "conflsnap" will be filled
2546 * in with the name. (It must be at least MAXNAMELEN bytes long.)
2549 dsl_dataset_promote(const char *name
, char *conflsnap
)
2551 dsl_dataset_promote_arg_t ddpa
= { 0 };
2557 * We will modify space proportional to the number of
2558 * snapshots. Compute numsnaps.
2560 error
= dmu_objset_hold(name
, FTAG
, &os
);
2563 error
= zap_count(dmu_objset_pool(os
)->dp_meta_objset
,
2564 dsl_dataset_phys(dmu_objset_ds(os
))->ds_snapnames_zapobj
,
2566 dmu_objset_rele(os
, FTAG
);
2570 ddpa
.ddpa_clonename
= name
;
2571 ddpa
.err_ds
= conflsnap
;
2574 return (dsl_sync_task(name
, dsl_dataset_promote_check
,
2575 dsl_dataset_promote_sync
, &ddpa
, 2 + numsnaps
));
2579 dsl_dataset_clone_swap_check_impl(dsl_dataset_t
*clone
,
2580 dsl_dataset_t
*origin_head
, boolean_t force
, void *owner
, dmu_tx_t
*tx
)
2582 int64_t unused_refres_delta
;
2584 /* they should both be heads */
2585 if (dsl_dataset_is_snapshot(clone
) ||
2586 dsl_dataset_is_snapshot(origin_head
))
2587 return (SET_ERROR(EINVAL
));
2589 /* if we are not forcing, the branch point should be just before them */
2590 if (!force
&& clone
->ds_prev
!= origin_head
->ds_prev
)
2591 return (SET_ERROR(EINVAL
));
2593 /* clone should be the clone (unless they are unrelated) */
2594 if (clone
->ds_prev
!= NULL
&&
2595 clone
->ds_prev
!= clone
->ds_dir
->dd_pool
->dp_origin_snap
&&
2596 origin_head
->ds_dir
!= clone
->ds_prev
->ds_dir
)
2597 return (SET_ERROR(EINVAL
));
2599 /* the clone should be a child of the origin */
2600 if (clone
->ds_dir
->dd_parent
!= origin_head
->ds_dir
)
2601 return (SET_ERROR(EINVAL
));
2603 /* origin_head shouldn't be modified unless 'force' */
2605 dsl_dataset_modified_since_snap(origin_head
, origin_head
->ds_prev
))
2606 return (SET_ERROR(ETXTBSY
));
2608 /* origin_head should have no long holds (e.g. is not mounted) */
2609 if (dsl_dataset_handoff_check(origin_head
, owner
, tx
))
2610 return (SET_ERROR(EBUSY
));
2612 /* check amount of any unconsumed refreservation */
2613 unused_refres_delta
=
2614 (int64_t)MIN(origin_head
->ds_reserved
,
2615 dsl_dataset_phys(origin_head
)->ds_unique_bytes
) -
2616 (int64_t)MIN(origin_head
->ds_reserved
,
2617 dsl_dataset_phys(clone
)->ds_unique_bytes
);
2619 if (unused_refres_delta
> 0 &&
2620 unused_refres_delta
>
2621 dsl_dir_space_available(origin_head
->ds_dir
, NULL
, 0, TRUE
))
2622 return (SET_ERROR(ENOSPC
));
2624 /* clone can't be over the head's refquota */
2625 if (origin_head
->ds_quota
!= 0 &&
2626 dsl_dataset_phys(clone
)->ds_referenced_bytes
>
2627 origin_head
->ds_quota
)
2628 return (SET_ERROR(EDQUOT
));
2634 dsl_dataset_clone_swap_sync_impl(dsl_dataset_t
*clone
,
2635 dsl_dataset_t
*origin_head
, dmu_tx_t
*tx
)
2637 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
2638 int64_t unused_refres_delta
;
2640 ASSERT(clone
->ds_reserved
== 0);
2641 ASSERT(origin_head
->ds_quota
== 0 ||
2642 dsl_dataset_phys(clone
)->ds_unique_bytes
<= origin_head
->ds_quota
);
2643 ASSERT3P(clone
->ds_prev
, ==, origin_head
->ds_prev
);
2645 dmu_buf_will_dirty(clone
->ds_dbuf
, tx
);
2646 dmu_buf_will_dirty(origin_head
->ds_dbuf
, tx
);
2648 if (clone
->ds_objset
!= NULL
) {
2649 dmu_objset_evict(clone
->ds_objset
);
2650 clone
->ds_objset
= NULL
;
2653 if (origin_head
->ds_objset
!= NULL
) {
2654 dmu_objset_evict(origin_head
->ds_objset
);
2655 origin_head
->ds_objset
= NULL
;
2658 unused_refres_delta
=
2659 (int64_t)MIN(origin_head
->ds_reserved
,
2660 dsl_dataset_phys(origin_head
)->ds_unique_bytes
) -
2661 (int64_t)MIN(origin_head
->ds_reserved
,
2662 dsl_dataset_phys(clone
)->ds_unique_bytes
);
2665 * Reset origin's unique bytes, if it exists.
2667 if (clone
->ds_prev
) {
2668 dsl_dataset_t
*origin
= clone
->ds_prev
;
2669 uint64_t comp
, uncomp
;
2671 dmu_buf_will_dirty(origin
->ds_dbuf
, tx
);
2672 dsl_deadlist_space_range(&clone
->ds_deadlist
,
2673 dsl_dataset_phys(origin
)->ds_prev_snap_txg
, UINT64_MAX
,
2674 &dsl_dataset_phys(origin
)->ds_unique_bytes
, &comp
, &uncomp
);
2680 tmp
= dsl_dataset_phys(origin_head
)->ds_bp
;
2681 dsl_dataset_phys(origin_head
)->ds_bp
=
2682 dsl_dataset_phys(clone
)->ds_bp
;
2683 dsl_dataset_phys(clone
)->ds_bp
= tmp
;
2686 /* set dd_*_bytes */
2688 int64_t dused
, dcomp
, duncomp
;
2689 uint64_t cdl_used
, cdl_comp
, cdl_uncomp
;
2690 uint64_t odl_used
, odl_comp
, odl_uncomp
;
2692 ASSERT3U(dsl_dir_phys(clone
->ds_dir
)->
2693 dd_used_breakdown
[DD_USED_SNAP
], ==, 0);
2695 dsl_deadlist_space(&clone
->ds_deadlist
,
2696 &cdl_used
, &cdl_comp
, &cdl_uncomp
);
2697 dsl_deadlist_space(&origin_head
->ds_deadlist
,
2698 &odl_used
, &odl_comp
, &odl_uncomp
);
2700 dused
= dsl_dataset_phys(clone
)->ds_referenced_bytes
+
2702 (dsl_dataset_phys(origin_head
)->ds_referenced_bytes
+
2704 dcomp
= dsl_dataset_phys(clone
)->ds_compressed_bytes
+
2706 (dsl_dataset_phys(origin_head
)->ds_compressed_bytes
+
2708 duncomp
= dsl_dataset_phys(clone
)->ds_uncompressed_bytes
+
2710 (dsl_dataset_phys(origin_head
)->ds_uncompressed_bytes
+
2713 dsl_dir_diduse_space(origin_head
->ds_dir
, DD_USED_HEAD
,
2714 dused
, dcomp
, duncomp
, tx
);
2715 dsl_dir_diduse_space(clone
->ds_dir
, DD_USED_HEAD
,
2716 -dused
, -dcomp
, -duncomp
, tx
);
2719 * The difference in the space used by snapshots is the
2720 * difference in snapshot space due to the head's
2721 * deadlist (since that's the only thing that's
2722 * changing that affects the snapused).
2724 dsl_deadlist_space_range(&clone
->ds_deadlist
,
2725 origin_head
->ds_dir
->dd_origin_txg
, UINT64_MAX
,
2726 &cdl_used
, &cdl_comp
, &cdl_uncomp
);
2727 dsl_deadlist_space_range(&origin_head
->ds_deadlist
,
2728 origin_head
->ds_dir
->dd_origin_txg
, UINT64_MAX
,
2729 &odl_used
, &odl_comp
, &odl_uncomp
);
2730 dsl_dir_transfer_space(origin_head
->ds_dir
, cdl_used
- odl_used
,
2731 DD_USED_HEAD
, DD_USED_SNAP
, tx
);
2734 /* swap ds_*_bytes */
2735 SWITCH64(dsl_dataset_phys(origin_head
)->ds_referenced_bytes
,
2736 dsl_dataset_phys(clone
)->ds_referenced_bytes
);
2737 SWITCH64(dsl_dataset_phys(origin_head
)->ds_compressed_bytes
,
2738 dsl_dataset_phys(clone
)->ds_compressed_bytes
);
2739 SWITCH64(dsl_dataset_phys(origin_head
)->ds_uncompressed_bytes
,
2740 dsl_dataset_phys(clone
)->ds_uncompressed_bytes
);
2741 SWITCH64(dsl_dataset_phys(origin_head
)->ds_unique_bytes
,
2742 dsl_dataset_phys(clone
)->ds_unique_bytes
);
2744 /* apply any parent delta for change in unconsumed refreservation */
2745 dsl_dir_diduse_space(origin_head
->ds_dir
, DD_USED_REFRSRV
,
2746 unused_refres_delta
, 0, 0, tx
);
2751 dsl_deadlist_close(&clone
->ds_deadlist
);
2752 dsl_deadlist_close(&origin_head
->ds_deadlist
);
2753 SWITCH64(dsl_dataset_phys(origin_head
)->ds_deadlist_obj
,
2754 dsl_dataset_phys(clone
)->ds_deadlist_obj
);
2755 dsl_deadlist_open(&clone
->ds_deadlist
, dp
->dp_meta_objset
,
2756 dsl_dataset_phys(clone
)->ds_deadlist_obj
);
2757 dsl_deadlist_open(&origin_head
->ds_deadlist
, dp
->dp_meta_objset
,
2758 dsl_dataset_phys(origin_head
)->ds_deadlist_obj
);
2760 dsl_scan_ds_clone_swapped(origin_head
, clone
, tx
);
2762 spa_history_log_internal_ds(clone
, "clone swap", tx
,
2763 "parent=%s", origin_head
->ds_dir
->dd_myname
);
2767 * Given a pool name and a dataset object number in that pool,
2768 * return the name of that dataset.
2771 dsl_dsobj_to_dsname(char *pname
, uint64_t obj
, char *buf
)
2777 error
= dsl_pool_hold(pname
, FTAG
, &dp
);
2781 error
= dsl_dataset_hold_obj(dp
, obj
, FTAG
, &ds
);
2783 dsl_dataset_name(ds
, buf
);
2784 dsl_dataset_rele(ds
, FTAG
);
2786 dsl_pool_rele(dp
, FTAG
);
2792 dsl_dataset_check_quota(dsl_dataset_t
*ds
, boolean_t check_quota
,
2793 uint64_t asize
, uint64_t inflight
, uint64_t *used
, uint64_t *ref_rsrv
)
2797 ASSERT3S(asize
, >, 0);
2800 * *ref_rsrv is the portion of asize that will come from any
2801 * unconsumed refreservation space.
2805 mutex_enter(&ds
->ds_lock
);
2807 * Make a space adjustment for reserved bytes.
2809 if (ds
->ds_reserved
> dsl_dataset_phys(ds
)->ds_unique_bytes
) {
2811 ds
->ds_reserved
- dsl_dataset_phys(ds
)->ds_unique_bytes
);
2813 (ds
->ds_reserved
- dsl_dataset_phys(ds
)->ds_unique_bytes
);
2815 asize
- MIN(asize
, parent_delta(ds
, asize
+ inflight
));
2818 if (!check_quota
|| ds
->ds_quota
== 0) {
2819 mutex_exit(&ds
->ds_lock
);
2823 * If they are requesting more space, and our current estimate
2824 * is over quota, they get to try again unless the actual
2825 * on-disk is over quota and there are no pending changes (which
2826 * may free up space for us).
2828 if (dsl_dataset_phys(ds
)->ds_referenced_bytes
+ inflight
>=
2831 dsl_dataset_phys(ds
)->ds_referenced_bytes
< ds
->ds_quota
)
2832 error
= SET_ERROR(ERESTART
);
2834 error
= SET_ERROR(EDQUOT
);
2836 mutex_exit(&ds
->ds_lock
);
2841 typedef struct dsl_dataset_set_qr_arg
{
2842 const char *ddsqra_name
;
2843 zprop_source_t ddsqra_source
;
2844 uint64_t ddsqra_value
;
2845 } dsl_dataset_set_qr_arg_t
;
2850 dsl_dataset_set_refquota_check(void *arg
, dmu_tx_t
*tx
)
2852 dsl_dataset_set_qr_arg_t
*ddsqra
= arg
;
2853 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
2858 if (spa_version(dp
->dp_spa
) < SPA_VERSION_REFQUOTA
)
2859 return (SET_ERROR(ENOTSUP
));
2861 error
= dsl_dataset_hold(dp
, ddsqra
->ddsqra_name
, FTAG
, &ds
);
2865 if (dsl_dataset_is_snapshot(ds
)) {
2866 dsl_dataset_rele(ds
, FTAG
);
2867 return (SET_ERROR(EINVAL
));
2870 error
= dsl_prop_predict(ds
->ds_dir
,
2871 zfs_prop_to_name(ZFS_PROP_REFQUOTA
),
2872 ddsqra
->ddsqra_source
, ddsqra
->ddsqra_value
, &newval
);
2874 dsl_dataset_rele(ds
, FTAG
);
2879 dsl_dataset_rele(ds
, FTAG
);
2883 if (newval
< dsl_dataset_phys(ds
)->ds_referenced_bytes
||
2884 newval
< ds
->ds_reserved
) {
2885 dsl_dataset_rele(ds
, FTAG
);
2886 return (SET_ERROR(ENOSPC
));
2889 dsl_dataset_rele(ds
, FTAG
);
2894 dsl_dataset_set_refquota_sync(void *arg
, dmu_tx_t
*tx
)
2896 dsl_dataset_set_qr_arg_t
*ddsqra
= arg
;
2897 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
2901 VERIFY0(dsl_dataset_hold(dp
, ddsqra
->ddsqra_name
, FTAG
, &ds
));
2903 dsl_prop_set_sync_impl(ds
,
2904 zfs_prop_to_name(ZFS_PROP_REFQUOTA
),
2905 ddsqra
->ddsqra_source
, sizeof (ddsqra
->ddsqra_value
), 1,
2906 &ddsqra
->ddsqra_value
, tx
);
2908 VERIFY0(dsl_prop_get_int_ds(ds
,
2909 zfs_prop_to_name(ZFS_PROP_REFQUOTA
), &newval
));
2911 if (ds
->ds_quota
!= newval
) {
2912 dmu_buf_will_dirty(ds
->ds_dbuf
, tx
);
2913 ds
->ds_quota
= newval
;
2915 dsl_dataset_rele(ds
, FTAG
);
2919 dsl_dataset_set_refquota(const char *dsname
, zprop_source_t source
,
2922 dsl_dataset_set_qr_arg_t ddsqra
;
2924 ddsqra
.ddsqra_name
= dsname
;
2925 ddsqra
.ddsqra_source
= source
;
2926 ddsqra
.ddsqra_value
= refquota
;
2928 return (dsl_sync_task(dsname
, dsl_dataset_set_refquota_check
,
2929 dsl_dataset_set_refquota_sync
, &ddsqra
, 0));
2933 dsl_dataset_set_refreservation_check(void *arg
, dmu_tx_t
*tx
)
2935 dsl_dataset_set_qr_arg_t
*ddsqra
= arg
;
2936 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
2939 uint64_t newval
, unique
;
2941 if (spa_version(dp
->dp_spa
) < SPA_VERSION_REFRESERVATION
)
2942 return (SET_ERROR(ENOTSUP
));
2944 error
= dsl_dataset_hold(dp
, ddsqra
->ddsqra_name
, FTAG
, &ds
);
2948 if (dsl_dataset_is_snapshot(ds
)) {
2949 dsl_dataset_rele(ds
, FTAG
);
2950 return (SET_ERROR(EINVAL
));
2953 error
= dsl_prop_predict(ds
->ds_dir
,
2954 zfs_prop_to_name(ZFS_PROP_REFRESERVATION
),
2955 ddsqra
->ddsqra_source
, ddsqra
->ddsqra_value
, &newval
);
2957 dsl_dataset_rele(ds
, FTAG
);
2962 * If we are doing the preliminary check in open context, the
2963 * space estimates may be inaccurate.
2965 if (!dmu_tx_is_syncing(tx
)) {
2966 dsl_dataset_rele(ds
, FTAG
);
2970 mutex_enter(&ds
->ds_lock
);
2971 if (!DS_UNIQUE_IS_ACCURATE(ds
))
2972 dsl_dataset_recalc_head_uniq(ds
);
2973 unique
= dsl_dataset_phys(ds
)->ds_unique_bytes
;
2974 mutex_exit(&ds
->ds_lock
);
2976 if (MAX(unique
, newval
) > MAX(unique
, ds
->ds_reserved
)) {
2977 uint64_t delta
= MAX(unique
, newval
) -
2978 MAX(unique
, ds
->ds_reserved
);
2981 dsl_dir_space_available(ds
->ds_dir
, NULL
, 0, B_TRUE
) ||
2982 (ds
->ds_quota
> 0 && newval
> ds
->ds_quota
)) {
2983 dsl_dataset_rele(ds
, FTAG
);
2984 return (SET_ERROR(ENOSPC
));
2988 dsl_dataset_rele(ds
, FTAG
);
2993 dsl_dataset_set_refreservation_sync_impl(dsl_dataset_t
*ds
,
2994 zprop_source_t source
, uint64_t value
, dmu_tx_t
*tx
)
3000 dsl_prop_set_sync_impl(ds
, zfs_prop_to_name(ZFS_PROP_REFRESERVATION
),
3001 source
, sizeof (value
), 1, &value
, tx
);
3003 VERIFY0(dsl_prop_get_int_ds(ds
,
3004 zfs_prop_to_name(ZFS_PROP_REFRESERVATION
), &newval
));
3006 dmu_buf_will_dirty(ds
->ds_dbuf
, tx
);
3007 mutex_enter(&ds
->ds_dir
->dd_lock
);
3008 mutex_enter(&ds
->ds_lock
);
3009 ASSERT(DS_UNIQUE_IS_ACCURATE(ds
));
3010 unique
= dsl_dataset_phys(ds
)->ds_unique_bytes
;
3011 delta
= MAX(0, (int64_t)(newval
- unique
)) -
3012 MAX(0, (int64_t)(ds
->ds_reserved
- unique
));
3013 ds
->ds_reserved
= newval
;
3014 mutex_exit(&ds
->ds_lock
);
3016 dsl_dir_diduse_space(ds
->ds_dir
, DD_USED_REFRSRV
, delta
, 0, 0, tx
);
3017 mutex_exit(&ds
->ds_dir
->dd_lock
);
3021 dsl_dataset_set_refreservation_sync(void *arg
, dmu_tx_t
*tx
)
3023 dsl_dataset_set_qr_arg_t
*ddsqra
= arg
;
3024 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
3027 VERIFY0(dsl_dataset_hold(dp
, ddsqra
->ddsqra_name
, FTAG
, &ds
));
3028 dsl_dataset_set_refreservation_sync_impl(ds
,
3029 ddsqra
->ddsqra_source
, ddsqra
->ddsqra_value
, tx
);
3030 dsl_dataset_rele(ds
, FTAG
);
3034 dsl_dataset_set_refreservation(const char *dsname
, zprop_source_t source
,
3035 uint64_t refreservation
)
3037 dsl_dataset_set_qr_arg_t ddsqra
;
3039 ddsqra
.ddsqra_name
= dsname
;
3040 ddsqra
.ddsqra_source
= source
;
3041 ddsqra
.ddsqra_value
= refreservation
;
3043 return (dsl_sync_task(dsname
, dsl_dataset_set_refreservation_check
,
3044 dsl_dataset_set_refreservation_sync
, &ddsqra
, 0));
3048 * Return (in *usedp) the amount of space written in new that is not
3049 * present in oldsnap. New may be a snapshot or the head. Old must be
3050 * a snapshot before new, in new's filesystem (or its origin). If not then
3051 * fail and return EINVAL.
3053 * The written space is calculated by considering two components: First, we
3054 * ignore any freed space, and calculate the written as new's used space
3055 * minus old's used space. Next, we add in the amount of space that was freed
3056 * between the two snapshots, thus reducing new's used space relative to old's.
3057 * Specifically, this is the space that was born before old->ds_creation_txg,
3058 * and freed before new (ie. on new's deadlist or a previous deadlist).
3060 * space freed [---------------------]
3061 * snapshots ---O-------O--------O-------O------
3065 dsl_dataset_space_written(dsl_dataset_t
*oldsnap
, dsl_dataset_t
*new,
3066 uint64_t *usedp
, uint64_t *compp
, uint64_t *uncompp
)
3070 dsl_pool_t
*dp
= new->ds_dir
->dd_pool
;
3072 ASSERT(dsl_pool_config_held(dp
));
3075 *usedp
+= dsl_dataset_phys(new)->ds_referenced_bytes
;
3076 *usedp
-= dsl_dataset_phys(oldsnap
)->ds_referenced_bytes
;
3079 *compp
+= dsl_dataset_phys(new)->ds_compressed_bytes
;
3080 *compp
-= dsl_dataset_phys(oldsnap
)->ds_compressed_bytes
;
3083 *uncompp
+= dsl_dataset_phys(new)->ds_uncompressed_bytes
;
3084 *uncompp
-= dsl_dataset_phys(oldsnap
)->ds_uncompressed_bytes
;
3086 snapobj
= new->ds_object
;
3087 while (snapobj
!= oldsnap
->ds_object
) {
3088 dsl_dataset_t
*snap
;
3089 uint64_t used
, comp
, uncomp
;
3091 if (snapobj
== new->ds_object
) {
3094 err
= dsl_dataset_hold_obj(dp
, snapobj
, FTAG
, &snap
);
3099 if (dsl_dataset_phys(snap
)->ds_prev_snap_txg
==
3100 dsl_dataset_phys(oldsnap
)->ds_creation_txg
) {
3102 * The blocks in the deadlist can not be born after
3103 * ds_prev_snap_txg, so get the whole deadlist space,
3104 * which is more efficient (especially for old-format
3105 * deadlists). Unfortunately the deadlist code
3106 * doesn't have enough information to make this
3107 * optimization itself.
3109 dsl_deadlist_space(&snap
->ds_deadlist
,
3110 &used
, &comp
, &uncomp
);
3112 dsl_deadlist_space_range(&snap
->ds_deadlist
,
3113 0, dsl_dataset_phys(oldsnap
)->ds_creation_txg
,
3114 &used
, &comp
, &uncomp
);
3121 * If we get to the beginning of the chain of snapshots
3122 * (ds_prev_snap_obj == 0) before oldsnap, then oldsnap
3123 * was not a snapshot of/before new.
3125 snapobj
= dsl_dataset_phys(snap
)->ds_prev_snap_obj
;
3127 dsl_dataset_rele(snap
, FTAG
);
3129 err
= SET_ERROR(EINVAL
);
3138 * Return (in *usedp) the amount of space that will be reclaimed if firstsnap,
3139 * lastsnap, and all snapshots in between are deleted.
3141 * blocks that would be freed [---------------------------]
3142 * snapshots ---O-------O--------O-------O--------O
3143 * firstsnap lastsnap
3145 * This is the set of blocks that were born after the snap before firstsnap,
3146 * (birth > firstsnap->prev_snap_txg) and died before the snap after the
3147 * last snap (ie, is on lastsnap->ds_next->ds_deadlist or an earlier deadlist).
3148 * We calculate this by iterating over the relevant deadlists (from the snap
3149 * after lastsnap, backward to the snap after firstsnap), summing up the
3150 * space on the deadlist that was born after the snap before firstsnap.
3153 dsl_dataset_space_wouldfree(dsl_dataset_t
*firstsnap
,
3154 dsl_dataset_t
*lastsnap
,
3155 uint64_t *usedp
, uint64_t *compp
, uint64_t *uncompp
)
3159 dsl_pool_t
*dp
= firstsnap
->ds_dir
->dd_pool
;
3161 ASSERT(dsl_dataset_is_snapshot(firstsnap
));
3162 ASSERT(dsl_dataset_is_snapshot(lastsnap
));
3165 * Check that the snapshots are in the same dsl_dir, and firstsnap
3166 * is before lastsnap.
3168 if (firstsnap
->ds_dir
!= lastsnap
->ds_dir
||
3169 dsl_dataset_phys(firstsnap
)->ds_creation_txg
>
3170 dsl_dataset_phys(lastsnap
)->ds_creation_txg
)
3171 return (SET_ERROR(EINVAL
));
3173 *usedp
= *compp
= *uncompp
= 0;
3175 snapobj
= dsl_dataset_phys(lastsnap
)->ds_next_snap_obj
;
3176 while (snapobj
!= firstsnap
->ds_object
) {
3178 uint64_t used
, comp
, uncomp
;
3180 err
= dsl_dataset_hold_obj(dp
, snapobj
, FTAG
, &ds
);
3184 dsl_deadlist_space_range(&ds
->ds_deadlist
,
3185 dsl_dataset_phys(firstsnap
)->ds_prev_snap_txg
, UINT64_MAX
,
3186 &used
, &comp
, &uncomp
);
3191 snapobj
= dsl_dataset_phys(ds
)->ds_prev_snap_obj
;
3192 ASSERT3U(snapobj
, !=, 0);
3193 dsl_dataset_rele(ds
, FTAG
);
3199 * Return TRUE if 'earlier' is an earlier snapshot in 'later's timeline.
3200 * For example, they could both be snapshots of the same filesystem, and
3201 * 'earlier' is before 'later'. Or 'earlier' could be the origin of
3202 * 'later's filesystem. Or 'earlier' could be an older snapshot in the origin's
3203 * filesystem. Or 'earlier' could be the origin's origin.
3205 * If non-zero, earlier_txg is used instead of earlier's ds_creation_txg.
3208 dsl_dataset_is_before(dsl_dataset_t
*later
, dsl_dataset_t
*earlier
,
3209 uint64_t earlier_txg
)
3211 dsl_pool_t
*dp
= later
->ds_dir
->dd_pool
;
3214 dsl_dataset_t
*origin
;
3216 ASSERT(dsl_pool_config_held(dp
));
3217 ASSERT(dsl_dataset_is_snapshot(earlier
) || earlier_txg
!= 0);
3219 if (earlier_txg
== 0)
3220 earlier_txg
= dsl_dataset_phys(earlier
)->ds_creation_txg
;
3222 if (dsl_dataset_is_snapshot(later
) &&
3223 earlier_txg
>= dsl_dataset_phys(later
)->ds_creation_txg
)
3226 if (later
->ds_dir
== earlier
->ds_dir
)
3228 if (!dsl_dir_is_clone(later
->ds_dir
))
3231 if (dsl_dir_phys(later
->ds_dir
)->dd_origin_obj
== earlier
->ds_object
)
3233 error
= dsl_dataset_hold_obj(dp
,
3234 dsl_dir_phys(later
->ds_dir
)->dd_origin_obj
, FTAG
, &origin
);
3237 ret
= dsl_dataset_is_before(origin
, earlier
, earlier_txg
);
3238 dsl_dataset_rele(origin
, FTAG
);
3244 dsl_dataset_zapify(dsl_dataset_t
*ds
, dmu_tx_t
*tx
)
3246 objset_t
*mos
= ds
->ds_dir
->dd_pool
->dp_meta_objset
;
3247 dmu_object_zapify(mos
, ds
->ds_object
, DMU_OT_DSL_DATASET
, tx
);
3250 #if defined(_KERNEL) && defined(HAVE_SPL)
3251 EXPORT_SYMBOL(dsl_dataset_hold
);
3252 EXPORT_SYMBOL(dsl_dataset_hold_obj
);
3253 EXPORT_SYMBOL(dsl_dataset_own
);
3254 EXPORT_SYMBOL(dsl_dataset_own_obj
);
3255 EXPORT_SYMBOL(dsl_dataset_name
);
3256 EXPORT_SYMBOL(dsl_dataset_rele
);
3257 EXPORT_SYMBOL(dsl_dataset_disown
);
3258 EXPORT_SYMBOL(dsl_dataset_tryown
);
3259 EXPORT_SYMBOL(dsl_dataset_create_sync
);
3260 EXPORT_SYMBOL(dsl_dataset_create_sync_dd
);
3261 EXPORT_SYMBOL(dsl_dataset_snapshot_check
);
3262 EXPORT_SYMBOL(dsl_dataset_snapshot_sync
);
3263 EXPORT_SYMBOL(dsl_dataset_promote
);
3264 EXPORT_SYMBOL(dsl_dataset_user_hold
);
3265 EXPORT_SYMBOL(dsl_dataset_user_release
);
3266 EXPORT_SYMBOL(dsl_dataset_get_holds
);
3267 EXPORT_SYMBOL(dsl_dataset_get_blkptr
);
3268 EXPORT_SYMBOL(dsl_dataset_set_blkptr
);
3269 EXPORT_SYMBOL(dsl_dataset_get_spa
);
3270 EXPORT_SYMBOL(dsl_dataset_modified_since_snap
);
3271 EXPORT_SYMBOL(dsl_dataset_space_written
);
3272 EXPORT_SYMBOL(dsl_dataset_space_wouldfree
);
3273 EXPORT_SYMBOL(dsl_dataset_sync
);
3274 EXPORT_SYMBOL(dsl_dataset_block_born
);
3275 EXPORT_SYMBOL(dsl_dataset_block_kill
);
3276 EXPORT_SYMBOL(dsl_dataset_block_freeable
);
3277 EXPORT_SYMBOL(dsl_dataset_prev_snap_txg
);
3278 EXPORT_SYMBOL(dsl_dataset_dirty
);
3279 EXPORT_SYMBOL(dsl_dataset_stats
);
3280 EXPORT_SYMBOL(dsl_dataset_fast_stat
);
3281 EXPORT_SYMBOL(dsl_dataset_space
);
3282 EXPORT_SYMBOL(dsl_dataset_fsid_guid
);
3283 EXPORT_SYMBOL(dsl_dsobj_to_dsname
);
3284 EXPORT_SYMBOL(dsl_dataset_check_quota
);
3285 EXPORT_SYMBOL(dsl_dataset_clone_swap_check_impl
);
3286 EXPORT_SYMBOL(dsl_dataset_clone_swap_sync_impl
);