4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
22 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
23 * Copyright (c) 2011, 2014 by Delphix. All rights reserved.
24 * Copyright (c) 2014, Joyent, Inc. All rights reserved.
25 * Copyright (c) 2014 RackTop Systems.
26 * Copyright (c) 2014 Spectra Logic Corporation, All rights reserved.
29 #include <sys/dmu_objset.h>
30 #include <sys/dsl_dataset.h>
31 #include <sys/dsl_dir.h>
32 #include <sys/dsl_prop.h>
33 #include <sys/dsl_synctask.h>
34 #include <sys/dmu_traverse.h>
35 #include <sys/dmu_impl.h>
36 #include <sys/dmu_tx.h>
40 #include <sys/zfeature.h>
41 #include <sys/unique.h>
42 #include <sys/zfs_context.h>
43 #include <sys/zfs_ioctl.h>
45 #include <sys/zfs_znode.h>
46 #include <sys/zfs_onexit.h>
48 #include <sys/dsl_scan.h>
49 #include <sys/dsl_deadlist.h>
50 #include <sys/dsl_destroy.h>
51 #include <sys/dsl_userhold.h>
52 #include <sys/dsl_bookmark.h>
55 * The SPA supports block sizes up to 16MB. However, very large blocks
56 * can have an impact on i/o latency (e.g. tying up a spinning disk for
57 * ~300ms), and also potentially on the memory allocator. Therefore,
58 * we do not allow the recordsize to be set larger than zfs_max_recordsize
59 * (default 1MB). Larger blocks can be created by changing this tunable,
60 * and pools with larger blocks can always be imported and used, regardless
63 int zfs_max_recordsize
= 1 * 1024 * 1024;
65 #define SWITCH64(x, y) \
67 uint64_t __tmp = (x); \
72 #define DS_REF_MAX (1ULL << 62)
74 extern inline dsl_dataset_phys_t
*dsl_dataset_phys(dsl_dataset_t
*ds
);
77 * Figure out how much of this delta should be propogated to the dsl_dir
78 * layer. If there's a refreservation, that space has already been
79 * partially accounted for in our ancestors.
82 parent_delta(dsl_dataset_t
*ds
, int64_t delta
)
84 dsl_dataset_phys_t
*ds_phys
;
85 uint64_t old_bytes
, new_bytes
;
87 if (ds
->ds_reserved
== 0)
90 ds_phys
= dsl_dataset_phys(ds
);
91 old_bytes
= MAX(ds_phys
->ds_unique_bytes
, ds
->ds_reserved
);
92 new_bytes
= MAX(ds_phys
->ds_unique_bytes
+ delta
, ds
->ds_reserved
);
94 ASSERT3U(ABS((int64_t)(new_bytes
- old_bytes
)), <=, ABS(delta
));
95 return (new_bytes
- old_bytes
);
99 dsl_dataset_block_born(dsl_dataset_t
*ds
, const blkptr_t
*bp
, dmu_tx_t
*tx
)
101 int used
= bp_get_dsize_sync(tx
->tx_pool
->dp_spa
, bp
);
102 int compressed
= BP_GET_PSIZE(bp
);
103 int uncompressed
= BP_GET_UCSIZE(bp
);
106 dprintf_bp(bp
, "ds=%p", ds
);
108 ASSERT(dmu_tx_is_syncing(tx
));
109 /* It could have been compressed away to nothing */
112 ASSERT(BP_GET_TYPE(bp
) != DMU_OT_NONE
);
113 ASSERT(DMU_OT_IS_VALID(BP_GET_TYPE(bp
)));
115 dsl_pool_mos_diduse_space(tx
->tx_pool
,
116 used
, compressed
, uncompressed
);
120 dmu_buf_will_dirty(ds
->ds_dbuf
, tx
);
121 mutex_enter(&ds
->ds_lock
);
122 delta
= parent_delta(ds
, used
);
123 dsl_dataset_phys(ds
)->ds_referenced_bytes
+= used
;
124 dsl_dataset_phys(ds
)->ds_compressed_bytes
+= compressed
;
125 dsl_dataset_phys(ds
)->ds_uncompressed_bytes
+= uncompressed
;
126 dsl_dataset_phys(ds
)->ds_unique_bytes
+= used
;
127 if (BP_GET_LSIZE(bp
) > SPA_OLD_MAXBLOCKSIZE
)
128 ds
->ds_need_large_blocks
= B_TRUE
;
129 mutex_exit(&ds
->ds_lock
);
130 dsl_dir_diduse_space(ds
->ds_dir
, DD_USED_HEAD
, delta
,
131 compressed
, uncompressed
, tx
);
132 dsl_dir_transfer_space(ds
->ds_dir
, used
- delta
,
133 DD_USED_REFRSRV
, DD_USED_HEAD
, tx
);
137 dsl_dataset_block_kill(dsl_dataset_t
*ds
, const blkptr_t
*bp
, dmu_tx_t
*tx
,
140 int used
= bp_get_dsize_sync(tx
->tx_pool
->dp_spa
, bp
);
141 int compressed
= BP_GET_PSIZE(bp
);
142 int uncompressed
= BP_GET_UCSIZE(bp
);
147 ASSERT(dmu_tx_is_syncing(tx
));
148 ASSERT(bp
->blk_birth
<= tx
->tx_txg
);
151 dsl_free(tx
->tx_pool
, tx
->tx_txg
, bp
);
152 dsl_pool_mos_diduse_space(tx
->tx_pool
,
153 -used
, -compressed
, -uncompressed
);
156 ASSERT3P(tx
->tx_pool
, ==, ds
->ds_dir
->dd_pool
);
158 ASSERT(!ds
->ds_is_snapshot
);
159 dmu_buf_will_dirty(ds
->ds_dbuf
, tx
);
161 if (bp
->blk_birth
> dsl_dataset_phys(ds
)->ds_prev_snap_txg
) {
164 dprintf_bp(bp
, "freeing ds=%llu", ds
->ds_object
);
165 dsl_free(tx
->tx_pool
, tx
->tx_txg
, bp
);
167 mutex_enter(&ds
->ds_lock
);
168 ASSERT(dsl_dataset_phys(ds
)->ds_unique_bytes
>= used
||
169 !DS_UNIQUE_IS_ACCURATE(ds
));
170 delta
= parent_delta(ds
, -used
);
171 dsl_dataset_phys(ds
)->ds_unique_bytes
-= used
;
172 mutex_exit(&ds
->ds_lock
);
173 dsl_dir_diduse_space(ds
->ds_dir
, DD_USED_HEAD
,
174 delta
, -compressed
, -uncompressed
, tx
);
175 dsl_dir_transfer_space(ds
->ds_dir
, -used
- delta
,
176 DD_USED_REFRSRV
, DD_USED_HEAD
, tx
);
178 dprintf_bp(bp
, "putting on dead list: %s", "");
181 * We are here as part of zio's write done callback,
182 * which means we're a zio interrupt thread. We can't
183 * call dsl_deadlist_insert() now because it may block
184 * waiting for I/O. Instead, put bp on the deferred
185 * queue and let dsl_pool_sync() finish the job.
187 bplist_append(&ds
->ds_pending_deadlist
, bp
);
189 dsl_deadlist_insert(&ds
->ds_deadlist
, bp
, tx
);
191 ASSERT3U(ds
->ds_prev
->ds_object
, ==,
192 dsl_dataset_phys(ds
)->ds_prev_snap_obj
);
193 ASSERT(dsl_dataset_phys(ds
->ds_prev
)->ds_num_children
> 0);
194 /* if (bp->blk_birth > prev prev snap txg) prev unique += bs */
195 if (dsl_dataset_phys(ds
->ds_prev
)->ds_next_snap_obj
==
196 ds
->ds_object
&& bp
->blk_birth
>
197 dsl_dataset_phys(ds
->ds_prev
)->ds_prev_snap_txg
) {
198 dmu_buf_will_dirty(ds
->ds_prev
->ds_dbuf
, tx
);
199 mutex_enter(&ds
->ds_prev
->ds_lock
);
200 dsl_dataset_phys(ds
->ds_prev
)->ds_unique_bytes
+= used
;
201 mutex_exit(&ds
->ds_prev
->ds_lock
);
203 if (bp
->blk_birth
> ds
->ds_dir
->dd_origin_txg
) {
204 dsl_dir_transfer_space(ds
->ds_dir
, used
,
205 DD_USED_HEAD
, DD_USED_SNAP
, tx
);
208 mutex_enter(&ds
->ds_lock
);
209 ASSERT3U(dsl_dataset_phys(ds
)->ds_referenced_bytes
, >=, used
);
210 dsl_dataset_phys(ds
)->ds_referenced_bytes
-= used
;
211 ASSERT3U(dsl_dataset_phys(ds
)->ds_compressed_bytes
, >=, compressed
);
212 dsl_dataset_phys(ds
)->ds_compressed_bytes
-= compressed
;
213 ASSERT3U(dsl_dataset_phys(ds
)->ds_uncompressed_bytes
, >=, uncompressed
);
214 dsl_dataset_phys(ds
)->ds_uncompressed_bytes
-= uncompressed
;
215 mutex_exit(&ds
->ds_lock
);
221 dsl_dataset_prev_snap_txg(dsl_dataset_t
*ds
)
223 uint64_t trysnap
= 0;
228 * The snapshot creation could fail, but that would cause an
229 * incorrect FALSE return, which would only result in an
230 * overestimation of the amount of space that an operation would
231 * consume, which is OK.
233 * There's also a small window where we could miss a pending
234 * snapshot, because we could set the sync task in the quiescing
235 * phase. So this should only be used as a guess.
237 if (ds
->ds_trysnap_txg
>
238 spa_last_synced_txg(ds
->ds_dir
->dd_pool
->dp_spa
))
239 trysnap
= ds
->ds_trysnap_txg
;
240 return (MAX(dsl_dataset_phys(ds
)->ds_prev_snap_txg
, trysnap
));
244 dsl_dataset_block_freeable(dsl_dataset_t
*ds
, const blkptr_t
*bp
,
247 if (blk_birth
<= dsl_dataset_prev_snap_txg(ds
) ||
248 (bp
!= NULL
&& BP_IS_HOLE(bp
)))
251 ddt_prefetch(dsl_dataset_get_spa(ds
), bp
);
257 dsl_dataset_evict(void *dbu
)
259 dsl_dataset_t
*ds
= dbu
;
261 ASSERT(ds
->ds_owner
== NULL
);
265 unique_remove(ds
->ds_fsid_guid
);
267 if (ds
->ds_objset
!= NULL
)
268 dmu_objset_evict(ds
->ds_objset
);
271 dsl_dataset_rele(ds
->ds_prev
, ds
);
275 bplist_destroy(&ds
->ds_pending_deadlist
);
276 if (ds
->ds_deadlist
.dl_os
!= NULL
)
277 dsl_deadlist_close(&ds
->ds_deadlist
);
279 dsl_dir_async_rele(ds
->ds_dir
, ds
);
281 ASSERT(!list_link_active(&ds
->ds_synced_link
));
283 mutex_destroy(&ds
->ds_lock
);
284 mutex_destroy(&ds
->ds_opening_lock
);
285 mutex_destroy(&ds
->ds_sendstream_lock
);
286 refcount_destroy(&ds
->ds_longholds
);
288 kmem_free(ds
, sizeof (dsl_dataset_t
));
292 dsl_dataset_get_snapname(dsl_dataset_t
*ds
)
294 dsl_dataset_phys_t
*headphys
;
297 dsl_pool_t
*dp
= ds
->ds_dir
->dd_pool
;
298 objset_t
*mos
= dp
->dp_meta_objset
;
300 if (ds
->ds_snapname
[0])
302 if (dsl_dataset_phys(ds
)->ds_next_snap_obj
== 0)
305 err
= dmu_bonus_hold(mos
, dsl_dir_phys(ds
->ds_dir
)->dd_head_dataset_obj
,
309 headphys
= headdbuf
->db_data
;
310 err
= zap_value_search(dp
->dp_meta_objset
,
311 headphys
->ds_snapnames_zapobj
, ds
->ds_object
, 0, ds
->ds_snapname
);
312 dmu_buf_rele(headdbuf
, FTAG
);
317 dsl_dataset_snap_lookup(dsl_dataset_t
*ds
, const char *name
, uint64_t *value
)
319 objset_t
*mos
= ds
->ds_dir
->dd_pool
->dp_meta_objset
;
320 uint64_t snapobj
= dsl_dataset_phys(ds
)->ds_snapnames_zapobj
;
324 if (dsl_dataset_phys(ds
)->ds_flags
& DS_FLAG_CI_DATASET
)
329 err
= zap_lookup_norm(mos
, snapobj
, name
, 8, 1,
330 value
, mt
, NULL
, 0, NULL
);
331 if (err
== ENOTSUP
&& mt
== MT_FIRST
)
332 err
= zap_lookup(mos
, snapobj
, name
, 8, 1, value
);
337 dsl_dataset_snap_remove(dsl_dataset_t
*ds
, const char *name
, dmu_tx_t
*tx
,
340 objset_t
*mos
= ds
->ds_dir
->dd_pool
->dp_meta_objset
;
341 uint64_t snapobj
= dsl_dataset_phys(ds
)->ds_snapnames_zapobj
;
345 dsl_dir_snap_cmtime_update(ds
->ds_dir
);
347 if (dsl_dataset_phys(ds
)->ds_flags
& DS_FLAG_CI_DATASET
)
352 err
= zap_remove_norm(mos
, snapobj
, name
, mt
, tx
);
353 if (err
== ENOTSUP
&& mt
== MT_FIRST
)
354 err
= zap_remove(mos
, snapobj
, name
, tx
);
356 if (err
== 0 && adj_cnt
)
357 dsl_fs_ss_count_adjust(ds
->ds_dir
, -1,
358 DD_FIELD_SNAPSHOT_COUNT
, tx
);
364 dsl_dataset_try_add_ref(dsl_pool_t
*dp
, dsl_dataset_t
*ds
, void *tag
)
366 dmu_buf_t
*dbuf
= ds
->ds_dbuf
;
367 boolean_t result
= B_FALSE
;
369 if (dbuf
!= NULL
&& dmu_buf_try_add_ref(dbuf
, dp
->dp_meta_objset
,
370 ds
->ds_object
, DMU_BONUS_BLKID
, tag
)) {
372 if (ds
== dmu_buf_get_user(dbuf
))
375 dmu_buf_rele(dbuf
, tag
);
382 dsl_dataset_hold_obj(dsl_pool_t
*dp
, uint64_t dsobj
, void *tag
,
385 objset_t
*mos
= dp
->dp_meta_objset
;
389 dmu_object_info_t doi
;
391 ASSERT(dsl_pool_config_held(dp
));
393 err
= dmu_bonus_hold(mos
, dsobj
, tag
, &dbuf
);
397 /* Make sure dsobj has the correct object type. */
398 dmu_object_info_from_db(dbuf
, &doi
);
399 if (doi
.doi_bonus_type
!= DMU_OT_DSL_DATASET
) {
400 dmu_buf_rele(dbuf
, tag
);
401 return (SET_ERROR(EINVAL
));
404 ds
= dmu_buf_get_user(dbuf
);
406 dsl_dataset_t
*winner
= NULL
;
408 ds
= kmem_zalloc(sizeof (dsl_dataset_t
), KM_SLEEP
);
410 ds
->ds_object
= dsobj
;
411 ds
->ds_is_snapshot
= dsl_dataset_phys(ds
)->ds_num_children
!= 0;
413 mutex_init(&ds
->ds_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
414 mutex_init(&ds
->ds_opening_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
415 mutex_init(&ds
->ds_sendstream_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
416 refcount_create(&ds
->ds_longholds
);
418 bplist_create(&ds
->ds_pending_deadlist
);
419 dsl_deadlist_open(&ds
->ds_deadlist
,
420 mos
, dsl_dataset_phys(ds
)->ds_deadlist_obj
);
422 list_create(&ds
->ds_sendstreams
, sizeof (dmu_sendarg_t
),
423 offsetof(dmu_sendarg_t
, dsa_link
));
425 if (doi
.doi_type
== DMU_OTN_ZAP_METADATA
) {
426 int zaperr
= zap_contains(mos
, dsobj
,
427 DS_FIELD_LARGE_BLOCKS
);
428 if (zaperr
!= ENOENT
) {
430 ds
->ds_large_blocks
= B_TRUE
;
435 err
= dsl_dir_hold_obj(dp
,
436 dsl_dataset_phys(ds
)->ds_dir_obj
, NULL
, ds
,
440 mutex_destroy(&ds
->ds_lock
);
441 mutex_destroy(&ds
->ds_opening_lock
);
442 mutex_destroy(&ds
->ds_sendstream_lock
);
443 refcount_destroy(&ds
->ds_longholds
);
444 bplist_destroy(&ds
->ds_pending_deadlist
);
445 dsl_deadlist_close(&ds
->ds_deadlist
);
446 kmem_free(ds
, sizeof (dsl_dataset_t
));
447 dmu_buf_rele(dbuf
, tag
);
451 if (!ds
->ds_is_snapshot
) {
452 ds
->ds_snapname
[0] = '\0';
453 if (dsl_dataset_phys(ds
)->ds_prev_snap_obj
!= 0) {
454 err
= dsl_dataset_hold_obj(dp
,
455 dsl_dataset_phys(ds
)->ds_prev_snap_obj
,
458 if (doi
.doi_type
== DMU_OTN_ZAP_METADATA
) {
459 int zaperr
= zap_lookup(mos
, ds
->ds_object
,
460 DS_FIELD_BOOKMARK_NAMES
,
461 sizeof (ds
->ds_bookmarks
), 1,
463 if (zaperr
!= ENOENT
)
467 if (zfs_flags
& ZFS_DEBUG_SNAPNAMES
)
468 err
= dsl_dataset_get_snapname(ds
);
470 dsl_dataset_phys(ds
)->ds_userrefs_obj
!= 0) {
472 ds
->ds_dir
->dd_pool
->dp_meta_objset
,
473 dsl_dataset_phys(ds
)->ds_userrefs_obj
,
478 if (err
== 0 && !ds
->ds_is_snapshot
) {
479 err
= dsl_prop_get_int_ds(ds
,
480 zfs_prop_to_name(ZFS_PROP_REFRESERVATION
),
483 err
= dsl_prop_get_int_ds(ds
,
484 zfs_prop_to_name(ZFS_PROP_REFQUOTA
),
488 ds
->ds_reserved
= ds
->ds_quota
= 0;
491 dmu_buf_init_user(&ds
->ds_dbu
, dsl_dataset_evict
, &ds
->ds_dbuf
);
493 winner
= dmu_buf_set_user_ie(dbuf
, &ds
->ds_dbu
);
495 if (err
!= 0 || winner
!= NULL
) {
496 bplist_destroy(&ds
->ds_pending_deadlist
);
497 dsl_deadlist_close(&ds
->ds_deadlist
);
499 dsl_dataset_rele(ds
->ds_prev
, ds
);
500 dsl_dir_rele(ds
->ds_dir
, ds
);
501 mutex_destroy(&ds
->ds_lock
);
502 mutex_destroy(&ds
->ds_opening_lock
);
503 mutex_destroy(&ds
->ds_sendstream_lock
);
504 refcount_destroy(&ds
->ds_longholds
);
505 kmem_free(ds
, sizeof (dsl_dataset_t
));
507 dmu_buf_rele(dbuf
, tag
);
513 unique_insert(dsl_dataset_phys(ds
)->ds_fsid_guid
);
516 ASSERT3P(ds
->ds_dbuf
, ==, dbuf
);
517 ASSERT3P(dsl_dataset_phys(ds
), ==, dbuf
->db_data
);
518 ASSERT(dsl_dataset_phys(ds
)->ds_prev_snap_obj
!= 0 ||
519 spa_version(dp
->dp_spa
) < SPA_VERSION_ORIGIN
||
520 dp
->dp_origin_snap
== NULL
|| ds
== dp
->dp_origin_snap
);
526 dsl_dataset_hold(dsl_pool_t
*dp
, const char *name
,
527 void *tag
, dsl_dataset_t
**dsp
)
530 const char *snapname
;
535 err
= dsl_dir_hold(dp
, name
, FTAG
, &dd
, &snapname
);
539 ASSERT(dsl_pool_config_held(dp
));
540 obj
= dsl_dir_phys(dd
)->dd_head_dataset_obj
;
542 err
= dsl_dataset_hold_obj(dp
, obj
, tag
, &ds
);
544 err
= SET_ERROR(ENOENT
);
546 /* we may be looking for a snapshot */
547 if (err
== 0 && snapname
!= NULL
) {
548 dsl_dataset_t
*snap_ds
;
550 if (*snapname
++ != '@') {
551 dsl_dataset_rele(ds
, tag
);
552 dsl_dir_rele(dd
, FTAG
);
553 return (SET_ERROR(ENOENT
));
556 dprintf("looking for snapshot '%s'\n", snapname
);
557 err
= dsl_dataset_snap_lookup(ds
, snapname
, &obj
);
559 err
= dsl_dataset_hold_obj(dp
, obj
, tag
, &snap_ds
);
560 dsl_dataset_rele(ds
, tag
);
563 mutex_enter(&snap_ds
->ds_lock
);
564 if (snap_ds
->ds_snapname
[0] == 0)
565 (void) strlcpy(snap_ds
->ds_snapname
, snapname
,
566 sizeof (snap_ds
->ds_snapname
));
567 mutex_exit(&snap_ds
->ds_lock
);
573 dsl_dir_rele(dd
, FTAG
);
578 dsl_dataset_own_obj(dsl_pool_t
*dp
, uint64_t dsobj
,
579 void *tag
, dsl_dataset_t
**dsp
)
581 int err
= dsl_dataset_hold_obj(dp
, dsobj
, tag
, dsp
);
584 if (!dsl_dataset_tryown(*dsp
, tag
)) {
585 dsl_dataset_rele(*dsp
, tag
);
587 return (SET_ERROR(EBUSY
));
593 dsl_dataset_own(dsl_pool_t
*dp
, const char *name
,
594 void *tag
, dsl_dataset_t
**dsp
)
596 int err
= dsl_dataset_hold(dp
, name
, tag
, dsp
);
599 if (!dsl_dataset_tryown(*dsp
, tag
)) {
600 dsl_dataset_rele(*dsp
, tag
);
601 return (SET_ERROR(EBUSY
));
607 * See the comment above dsl_pool_hold() for details. In summary, a long
608 * hold is used to prevent destruction of a dataset while the pool hold
609 * is dropped, allowing other concurrent operations (e.g. spa_sync()).
611 * The dataset and pool must be held when this function is called. After it
612 * is called, the pool hold may be released while the dataset is still held
616 dsl_dataset_long_hold(dsl_dataset_t
*ds
, void *tag
)
618 ASSERT(dsl_pool_config_held(ds
->ds_dir
->dd_pool
));
619 (void) refcount_add(&ds
->ds_longholds
, tag
);
623 dsl_dataset_long_rele(dsl_dataset_t
*ds
, void *tag
)
625 (void) refcount_remove(&ds
->ds_longholds
, tag
);
628 /* Return B_TRUE if there are any long holds on this dataset. */
630 dsl_dataset_long_held(dsl_dataset_t
*ds
)
632 return (!refcount_is_zero(&ds
->ds_longholds
));
636 dsl_dataset_name(dsl_dataset_t
*ds
, char *name
)
639 (void) strcpy(name
, "mos");
641 dsl_dir_name(ds
->ds_dir
, name
);
642 VERIFY0(dsl_dataset_get_snapname(ds
));
643 if (ds
->ds_snapname
[0]) {
644 (void) strcat(name
, "@");
646 * We use a "recursive" mutex so that we
647 * can call dprintf_ds() with ds_lock held.
649 if (!MUTEX_HELD(&ds
->ds_lock
)) {
650 mutex_enter(&ds
->ds_lock
);
651 (void) strcat(name
, ds
->ds_snapname
);
652 mutex_exit(&ds
->ds_lock
);
654 (void) strcat(name
, ds
->ds_snapname
);
661 dsl_dataset_rele(dsl_dataset_t
*ds
, void *tag
)
663 dmu_buf_rele(ds
->ds_dbuf
, tag
);
667 dsl_dataset_disown(dsl_dataset_t
*ds
, void *tag
)
669 ASSERT3P(ds
->ds_owner
, ==, tag
);
670 ASSERT(ds
->ds_dbuf
!= NULL
);
672 mutex_enter(&ds
->ds_lock
);
674 mutex_exit(&ds
->ds_lock
);
675 dsl_dataset_long_rele(ds
, tag
);
676 dsl_dataset_rele(ds
, tag
);
680 dsl_dataset_tryown(dsl_dataset_t
*ds
, void *tag
)
682 boolean_t gotit
= FALSE
;
684 mutex_enter(&ds
->ds_lock
);
685 if (ds
->ds_owner
== NULL
&& !DS_IS_INCONSISTENT(ds
)) {
687 dsl_dataset_long_hold(ds
, tag
);
690 mutex_exit(&ds
->ds_lock
);
695 dsl_dataset_create_sync_dd(dsl_dir_t
*dd
, dsl_dataset_t
*origin
,
696 uint64_t flags
, dmu_tx_t
*tx
)
698 dsl_pool_t
*dp
= dd
->dd_pool
;
700 dsl_dataset_phys_t
*dsphys
;
702 objset_t
*mos
= dp
->dp_meta_objset
;
705 origin
= dp
->dp_origin_snap
;
707 ASSERT(origin
== NULL
|| origin
->ds_dir
->dd_pool
== dp
);
708 ASSERT(origin
== NULL
|| dsl_dataset_phys(origin
)->ds_num_children
> 0);
709 ASSERT(dmu_tx_is_syncing(tx
));
710 ASSERT(dsl_dir_phys(dd
)->dd_head_dataset_obj
== 0);
712 dsobj
= dmu_object_alloc(mos
, DMU_OT_DSL_DATASET
, 0,
713 DMU_OT_DSL_DATASET
, sizeof (dsl_dataset_phys_t
), tx
);
714 VERIFY0(dmu_bonus_hold(mos
, dsobj
, FTAG
, &dbuf
));
715 dmu_buf_will_dirty(dbuf
, tx
);
716 dsphys
= dbuf
->db_data
;
717 bzero(dsphys
, sizeof (dsl_dataset_phys_t
));
718 dsphys
->ds_dir_obj
= dd
->dd_object
;
719 dsphys
->ds_flags
= flags
;
720 dsphys
->ds_fsid_guid
= unique_create();
721 (void) random_get_pseudo_bytes((void*)&dsphys
->ds_guid
,
722 sizeof (dsphys
->ds_guid
));
723 dsphys
->ds_snapnames_zapobj
=
724 zap_create_norm(mos
, U8_TEXTPREP_TOUPPER
, DMU_OT_DSL_DS_SNAP_MAP
,
726 dsphys
->ds_creation_time
= gethrestime_sec();
727 dsphys
->ds_creation_txg
= tx
->tx_txg
== TXG_INITIAL
? 1 : tx
->tx_txg
;
729 if (origin
== NULL
) {
730 dsphys
->ds_deadlist_obj
= dsl_deadlist_alloc(mos
, tx
);
732 dsl_dataset_t
*ohds
; /* head of the origin snapshot */
734 dsphys
->ds_prev_snap_obj
= origin
->ds_object
;
735 dsphys
->ds_prev_snap_txg
=
736 dsl_dataset_phys(origin
)->ds_creation_txg
;
737 dsphys
->ds_referenced_bytes
=
738 dsl_dataset_phys(origin
)->ds_referenced_bytes
;
739 dsphys
->ds_compressed_bytes
=
740 dsl_dataset_phys(origin
)->ds_compressed_bytes
;
741 dsphys
->ds_uncompressed_bytes
=
742 dsl_dataset_phys(origin
)->ds_uncompressed_bytes
;
743 dsphys
->ds_bp
= dsl_dataset_phys(origin
)->ds_bp
;
746 * Inherit flags that describe the dataset's contents
747 * (INCONSISTENT) or properties (Case Insensitive).
749 dsphys
->ds_flags
|= dsl_dataset_phys(origin
)->ds_flags
&
750 (DS_FLAG_INCONSISTENT
| DS_FLAG_CI_DATASET
);
752 if (origin
->ds_large_blocks
)
753 dsl_dataset_activate_large_blocks_sync_impl(dsobj
, tx
);
755 dmu_buf_will_dirty(origin
->ds_dbuf
, tx
);
756 dsl_dataset_phys(origin
)->ds_num_children
++;
758 VERIFY0(dsl_dataset_hold_obj(dp
,
759 dsl_dir_phys(origin
->ds_dir
)->dd_head_dataset_obj
,
761 dsphys
->ds_deadlist_obj
= dsl_deadlist_clone(&ohds
->ds_deadlist
,
762 dsphys
->ds_prev_snap_txg
, dsphys
->ds_prev_snap_obj
, tx
);
763 dsl_dataset_rele(ohds
, FTAG
);
765 if (spa_version(dp
->dp_spa
) >= SPA_VERSION_NEXT_CLONES
) {
766 if (dsl_dataset_phys(origin
)->ds_next_clones_obj
== 0) {
767 dsl_dataset_phys(origin
)->ds_next_clones_obj
=
769 DMU_OT_NEXT_CLONES
, DMU_OT_NONE
, 0, tx
);
771 VERIFY0(zap_add_int(mos
,
772 dsl_dataset_phys(origin
)->ds_next_clones_obj
,
776 dmu_buf_will_dirty(dd
->dd_dbuf
, tx
);
777 dsl_dir_phys(dd
)->dd_origin_obj
= origin
->ds_object
;
778 if (spa_version(dp
->dp_spa
) >= SPA_VERSION_DIR_CLONES
) {
779 if (dsl_dir_phys(origin
->ds_dir
)->dd_clones
== 0) {
780 dmu_buf_will_dirty(origin
->ds_dir
->dd_dbuf
, tx
);
781 dsl_dir_phys(origin
->ds_dir
)->dd_clones
=
783 DMU_OT_DSL_CLONES
, DMU_OT_NONE
, 0, tx
);
785 VERIFY0(zap_add_int(mos
,
786 dsl_dir_phys(origin
->ds_dir
)->dd_clones
,
791 if (spa_version(dp
->dp_spa
) >= SPA_VERSION_UNIQUE_ACCURATE
)
792 dsphys
->ds_flags
|= DS_FLAG_UNIQUE_ACCURATE
;
794 dmu_buf_rele(dbuf
, FTAG
);
796 dmu_buf_will_dirty(dd
->dd_dbuf
, tx
);
797 dsl_dir_phys(dd
)->dd_head_dataset_obj
= dsobj
;
803 dsl_dataset_zero_zil(dsl_dataset_t
*ds
, dmu_tx_t
*tx
)
807 VERIFY0(dmu_objset_from_ds(ds
, &os
));
808 bzero(&os
->os_zil_header
, sizeof (os
->os_zil_header
));
809 dsl_dataset_dirty(ds
, tx
);
813 dsl_dataset_create_sync(dsl_dir_t
*pdd
, const char *lastname
,
814 dsl_dataset_t
*origin
, uint64_t flags
, cred_t
*cr
, dmu_tx_t
*tx
)
816 dsl_pool_t
*dp
= pdd
->dd_pool
;
817 uint64_t dsobj
, ddobj
;
820 ASSERT(dmu_tx_is_syncing(tx
));
821 ASSERT(lastname
[0] != '@');
823 ddobj
= dsl_dir_create_sync(dp
, pdd
, lastname
, tx
);
824 VERIFY0(dsl_dir_hold_obj(dp
, ddobj
, lastname
, FTAG
, &dd
));
826 dsobj
= dsl_dataset_create_sync_dd(dd
, origin
,
827 flags
& ~DS_CREATE_FLAG_NODIRTY
, tx
);
829 dsl_deleg_set_create_perms(dd
, tx
, cr
);
832 * Since we're creating a new node we know it's a leaf, so we can
833 * initialize the counts if the limit feature is active.
835 if (spa_feature_is_active(dp
->dp_spa
, SPA_FEATURE_FS_SS_LIMIT
)) {
837 objset_t
*os
= dd
->dd_pool
->dp_meta_objset
;
839 dsl_dir_zapify(dd
, tx
);
840 VERIFY0(zap_add(os
, dd
->dd_object
, DD_FIELD_FILESYSTEM_COUNT
,
841 sizeof (cnt
), 1, &cnt
, tx
));
842 VERIFY0(zap_add(os
, dd
->dd_object
, DD_FIELD_SNAPSHOT_COUNT
,
843 sizeof (cnt
), 1, &cnt
, tx
));
846 dsl_dir_rele(dd
, FTAG
);
849 * If we are creating a clone, make sure we zero out any stale
850 * data from the origin snapshots zil header.
852 if (origin
!= NULL
&& !(flags
& DS_CREATE_FLAG_NODIRTY
)) {
855 VERIFY0(dsl_dataset_hold_obj(dp
, dsobj
, FTAG
, &ds
));
856 dsl_dataset_zero_zil(ds
, tx
);
857 dsl_dataset_rele(ds
, FTAG
);
864 * The unique space in the head dataset can be calculated by subtracting
865 * the space used in the most recent snapshot, that is still being used
866 * in this file system, from the space currently in use. To figure out
867 * the space in the most recent snapshot still in use, we need to take
868 * the total space used in the snapshot and subtract out the space that
869 * has been freed up since the snapshot was taken.
872 dsl_dataset_recalc_head_uniq(dsl_dataset_t
*ds
)
875 uint64_t dlused
, dlcomp
, dluncomp
;
877 ASSERT(!ds
->ds_is_snapshot
);
879 if (dsl_dataset_phys(ds
)->ds_prev_snap_obj
!= 0)
880 mrs_used
= dsl_dataset_phys(ds
->ds_prev
)->ds_referenced_bytes
;
884 dsl_deadlist_space(&ds
->ds_deadlist
, &dlused
, &dlcomp
, &dluncomp
);
886 ASSERT3U(dlused
, <=, mrs_used
);
887 dsl_dataset_phys(ds
)->ds_unique_bytes
=
888 dsl_dataset_phys(ds
)->ds_referenced_bytes
- (mrs_used
- dlused
);
890 if (spa_version(ds
->ds_dir
->dd_pool
->dp_spa
) >=
891 SPA_VERSION_UNIQUE_ACCURATE
)
892 dsl_dataset_phys(ds
)->ds_flags
|= DS_FLAG_UNIQUE_ACCURATE
;
896 dsl_dataset_remove_from_next_clones(dsl_dataset_t
*ds
, uint64_t obj
,
899 objset_t
*mos
= ds
->ds_dir
->dd_pool
->dp_meta_objset
;
903 ASSERT(dsl_dataset_phys(ds
)->ds_num_children
>= 2);
904 err
= zap_remove_int(mos
, dsl_dataset_phys(ds
)->ds_next_clones_obj
,
907 * The err should not be ENOENT, but a bug in a previous version
908 * of the code could cause upgrade_clones_cb() to not set
909 * ds_next_snap_obj when it should, leading to a missing entry.
910 * If we knew that the pool was created after
911 * SPA_VERSION_NEXT_CLONES, we could assert that it isn't
912 * ENOENT. However, at least we can check that we don't have
913 * too many entries in the next_clones_obj even after failing to
918 ASSERT0(zap_count(mos
, dsl_dataset_phys(ds
)->ds_next_clones_obj
,
920 ASSERT3U(count
, <=, dsl_dataset_phys(ds
)->ds_num_children
- 2);
925 dsl_dataset_get_blkptr(dsl_dataset_t
*ds
)
927 return (&dsl_dataset_phys(ds
)->ds_bp
);
931 dsl_dataset_set_blkptr(dsl_dataset_t
*ds
, blkptr_t
*bp
, dmu_tx_t
*tx
)
933 ASSERT(dmu_tx_is_syncing(tx
));
934 /* If it's the meta-objset, set dp_meta_rootbp */
936 tx
->tx_pool
->dp_meta_rootbp
= *bp
;
938 dmu_buf_will_dirty(ds
->ds_dbuf
, tx
);
939 dsl_dataset_phys(ds
)->ds_bp
= *bp
;
944 dsl_dataset_get_spa(dsl_dataset_t
*ds
)
946 return (ds
->ds_dir
->dd_pool
->dp_spa
);
950 dsl_dataset_dirty(dsl_dataset_t
*ds
, dmu_tx_t
*tx
)
954 if (ds
== NULL
) /* this is the meta-objset */
957 ASSERT(ds
->ds_objset
!= NULL
);
959 if (dsl_dataset_phys(ds
)->ds_next_snap_obj
!= 0)
960 panic("dirtying snapshot!");
962 dp
= ds
->ds_dir
->dd_pool
;
964 if (txg_list_add(&dp
->dp_dirty_datasets
, ds
, tx
->tx_txg
)) {
965 /* up the hold count until we can be written out */
966 dmu_buf_add_ref(ds
->ds_dbuf
, ds
);
971 dsl_dataset_is_dirty(dsl_dataset_t
*ds
)
973 for (int t
= 0; t
< TXG_SIZE
; t
++) {
974 if (txg_list_member(&ds
->ds_dir
->dd_pool
->dp_dirty_datasets
,
982 dsl_dataset_snapshot_reserve_space(dsl_dataset_t
*ds
, dmu_tx_t
*tx
)
986 if (!dmu_tx_is_syncing(tx
))
990 * If there's an fs-only reservation, any blocks that might become
991 * owned by the snapshot dataset must be accommodated by space
992 * outside of the reservation.
994 ASSERT(ds
->ds_reserved
== 0 || DS_UNIQUE_IS_ACCURATE(ds
));
995 asize
= MIN(dsl_dataset_phys(ds
)->ds_unique_bytes
, ds
->ds_reserved
);
996 if (asize
> dsl_dir_space_available(ds
->ds_dir
, NULL
, 0, TRUE
))
997 return (SET_ERROR(ENOSPC
));
1000 * Propagate any reserved space for this snapshot to other
1001 * snapshot checks in this sync group.
1004 dsl_dir_willuse_space(ds
->ds_dir
, asize
, tx
);
1009 typedef struct dsl_dataset_snapshot_arg
{
1010 nvlist_t
*ddsa_snaps
;
1011 nvlist_t
*ddsa_props
;
1012 nvlist_t
*ddsa_errors
;
1014 } dsl_dataset_snapshot_arg_t
;
1017 dsl_dataset_snapshot_check_impl(dsl_dataset_t
*ds
, const char *snapname
,
1018 dmu_tx_t
*tx
, boolean_t recv
, uint64_t cnt
, cred_t
*cr
)
1023 ds
->ds_trysnap_txg
= tx
->tx_txg
;
1025 if (!dmu_tx_is_syncing(tx
))
1029 * We don't allow multiple snapshots of the same txg. If there
1030 * is already one, try again.
1032 if (dsl_dataset_phys(ds
)->ds_prev_snap_txg
>= tx
->tx_txg
)
1033 return (SET_ERROR(EAGAIN
));
1036 * Check for conflicting snapshot name.
1038 error
= dsl_dataset_snap_lookup(ds
, snapname
, &value
);
1040 return (SET_ERROR(EEXIST
));
1041 if (error
!= ENOENT
)
1045 * We don't allow taking snapshots of inconsistent datasets, such as
1046 * those into which we are currently receiving. However, if we are
1047 * creating this snapshot as part of a receive, this check will be
1048 * executed atomically with respect to the completion of the receive
1049 * itself but prior to the clearing of DS_FLAG_INCONSISTENT; in this
1050 * case we ignore this, knowing it will be fixed up for us shortly in
1051 * dmu_recv_end_sync().
1053 if (!recv
&& DS_IS_INCONSISTENT(ds
))
1054 return (SET_ERROR(EBUSY
));
1057 * Skip the check for temporary snapshots or if we have already checked
1058 * the counts in dsl_dataset_snapshot_check. This means we really only
1059 * check the count here when we're receiving a stream.
1061 if (cnt
!= 0 && cr
!= NULL
) {
1062 error
= dsl_fs_ss_limit_check(ds
->ds_dir
, cnt
,
1063 ZFS_PROP_SNAPSHOT_LIMIT
, NULL
, cr
);
1068 error
= dsl_dataset_snapshot_reserve_space(ds
, tx
);
1076 dsl_dataset_snapshot_check(void *arg
, dmu_tx_t
*tx
)
1078 dsl_dataset_snapshot_arg_t
*ddsa
= arg
;
1079 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
1084 * Pre-compute how many total new snapshots will be created for each
1085 * level in the tree and below. This is needed for validating the
1086 * snapshot limit when either taking a recursive snapshot or when
1087 * taking multiple snapshots.
1089 * The problem is that the counts are not actually adjusted when
1090 * we are checking, only when we finally sync. For a single snapshot,
1091 * this is easy, the count will increase by 1 at each node up the tree,
1092 * but its more complicated for the recursive/multiple snapshot case.
1094 * The dsl_fs_ss_limit_check function does recursively check the count
1095 * at each level up the tree but since it is validating each snapshot
1096 * independently we need to be sure that we are validating the complete
1097 * count for the entire set of snapshots. We do this by rolling up the
1098 * counts for each component of the name into an nvlist and then
1099 * checking each of those cases with the aggregated count.
1101 * This approach properly handles not only the recursive snapshot
1102 * case (where we get all of those on the ddsa_snaps list) but also
1103 * the sibling case (e.g. snapshot a/b and a/c so that we will also
1104 * validate the limit on 'a' using a count of 2).
1106 * We validate the snapshot names in the third loop and only report
1109 if (dmu_tx_is_syncing(tx
)) {
1110 nvlist_t
*cnt_track
= NULL
;
1111 cnt_track
= fnvlist_alloc();
1113 /* Rollup aggregated counts into the cnt_track list */
1114 for (pair
= nvlist_next_nvpair(ddsa
->ddsa_snaps
, NULL
);
1116 pair
= nvlist_next_nvpair(ddsa
->ddsa_snaps
, pair
)) {
1119 char nm
[MAXPATHLEN
];
1121 (void) strlcpy(nm
, nvpair_name(pair
), sizeof (nm
));
1122 pdelim
= strchr(nm
, '@');
1128 if (nvlist_lookup_uint64(cnt_track
, nm
,
1130 /* update existing entry */
1131 fnvlist_add_uint64(cnt_track
, nm
,
1135 fnvlist_add_uint64(cnt_track
, nm
, 1);
1138 pdelim
= strrchr(nm
, '/');
1141 } while (pdelim
!= NULL
);
1144 /* Check aggregated counts at each level */
1145 for (pair
= nvlist_next_nvpair(cnt_track
, NULL
);
1146 pair
!= NULL
; pair
= nvlist_next_nvpair(cnt_track
, pair
)) {
1152 name
= nvpair_name(pair
);
1153 cnt
= fnvpair_value_uint64(pair
);
1156 error
= dsl_dataset_hold(dp
, name
, FTAG
, &ds
);
1158 error
= dsl_fs_ss_limit_check(ds
->ds_dir
, cnt
,
1159 ZFS_PROP_SNAPSHOT_LIMIT
, NULL
,
1161 dsl_dataset_rele(ds
, FTAG
);
1165 if (ddsa
->ddsa_errors
!= NULL
)
1166 fnvlist_add_int32(ddsa
->ddsa_errors
,
1169 /* only report one error for this check */
1173 nvlist_free(cnt_track
);
1176 for (pair
= nvlist_next_nvpair(ddsa
->ddsa_snaps
, NULL
);
1177 pair
!= NULL
; pair
= nvlist_next_nvpair(ddsa
->ddsa_snaps
, pair
)) {
1181 char dsname
[MAXNAMELEN
];
1183 name
= nvpair_name(pair
);
1184 if (strlen(name
) >= MAXNAMELEN
)
1185 error
= SET_ERROR(ENAMETOOLONG
);
1187 atp
= strchr(name
, '@');
1189 error
= SET_ERROR(EINVAL
);
1191 (void) strlcpy(dsname
, name
, atp
- name
+ 1);
1194 error
= dsl_dataset_hold(dp
, dsname
, FTAG
, &ds
);
1196 /* passing 0/NULL skips dsl_fs_ss_limit_check */
1197 error
= dsl_dataset_snapshot_check_impl(ds
,
1198 atp
+ 1, tx
, B_FALSE
, 0, NULL
);
1199 dsl_dataset_rele(ds
, FTAG
);
1203 if (ddsa
->ddsa_errors
!= NULL
) {
1204 fnvlist_add_int32(ddsa
->ddsa_errors
,
1215 dsl_dataset_snapshot_sync_impl(dsl_dataset_t
*ds
, const char *snapname
,
1218 static zil_header_t zero_zil
;
1220 dsl_pool_t
*dp
= ds
->ds_dir
->dd_pool
;
1222 dsl_dataset_phys_t
*dsphys
;
1223 uint64_t dsobj
, crtxg
;
1224 objset_t
*mos
= dp
->dp_meta_objset
;
1227 ASSERT(RRW_WRITE_HELD(&dp
->dp_config_rwlock
));
1230 * If we are on an old pool, the zil must not be active, in which
1231 * case it will be zeroed. Usually zil_suspend() accomplishes this.
1233 ASSERT(spa_version(dmu_tx_pool(tx
)->dp_spa
) >= SPA_VERSION_FAST_SNAP
||
1234 dmu_objset_from_ds(ds
, &os
) != 0 ||
1235 bcmp(&os
->os_phys
->os_zil_header
, &zero_zil
,
1236 sizeof (zero_zil
)) == 0);
1238 dsl_fs_ss_count_adjust(ds
->ds_dir
, 1, DD_FIELD_SNAPSHOT_COUNT
, tx
);
1241 * The origin's ds_creation_txg has to be < TXG_INITIAL
1243 if (strcmp(snapname
, ORIGIN_DIR_NAME
) == 0)
1248 dsobj
= dmu_object_alloc(mos
, DMU_OT_DSL_DATASET
, 0,
1249 DMU_OT_DSL_DATASET
, sizeof (dsl_dataset_phys_t
), tx
);
1250 VERIFY0(dmu_bonus_hold(mos
, dsobj
, FTAG
, &dbuf
));
1251 dmu_buf_will_dirty(dbuf
, tx
);
1252 dsphys
= dbuf
->db_data
;
1253 bzero(dsphys
, sizeof (dsl_dataset_phys_t
));
1254 dsphys
->ds_dir_obj
= ds
->ds_dir
->dd_object
;
1255 dsphys
->ds_fsid_guid
= unique_create();
1256 (void) random_get_pseudo_bytes((void*)&dsphys
->ds_guid
,
1257 sizeof (dsphys
->ds_guid
));
1258 dsphys
->ds_prev_snap_obj
= dsl_dataset_phys(ds
)->ds_prev_snap_obj
;
1259 dsphys
->ds_prev_snap_txg
= dsl_dataset_phys(ds
)->ds_prev_snap_txg
;
1260 dsphys
->ds_next_snap_obj
= ds
->ds_object
;
1261 dsphys
->ds_num_children
= 1;
1262 dsphys
->ds_creation_time
= gethrestime_sec();
1263 dsphys
->ds_creation_txg
= crtxg
;
1264 dsphys
->ds_deadlist_obj
= dsl_dataset_phys(ds
)->ds_deadlist_obj
;
1265 dsphys
->ds_referenced_bytes
= dsl_dataset_phys(ds
)->ds_referenced_bytes
;
1266 dsphys
->ds_compressed_bytes
= dsl_dataset_phys(ds
)->ds_compressed_bytes
;
1267 dsphys
->ds_uncompressed_bytes
=
1268 dsl_dataset_phys(ds
)->ds_uncompressed_bytes
;
1269 dsphys
->ds_flags
= dsl_dataset_phys(ds
)->ds_flags
;
1270 dsphys
->ds_bp
= dsl_dataset_phys(ds
)->ds_bp
;
1271 dmu_buf_rele(dbuf
, FTAG
);
1273 if (ds
->ds_large_blocks
)
1274 dsl_dataset_activate_large_blocks_sync_impl(dsobj
, tx
);
1276 ASSERT3U(ds
->ds_prev
!= 0, ==,
1277 dsl_dataset_phys(ds
)->ds_prev_snap_obj
!= 0);
1279 uint64_t next_clones_obj
=
1280 dsl_dataset_phys(ds
->ds_prev
)->ds_next_clones_obj
;
1281 ASSERT(dsl_dataset_phys(ds
->ds_prev
)->ds_next_snap_obj
==
1283 dsl_dataset_phys(ds
->ds_prev
)->ds_num_children
> 1);
1284 if (dsl_dataset_phys(ds
->ds_prev
)->ds_next_snap_obj
==
1286 dmu_buf_will_dirty(ds
->ds_prev
->ds_dbuf
, tx
);
1287 ASSERT3U(dsl_dataset_phys(ds
)->ds_prev_snap_txg
, ==,
1288 dsl_dataset_phys(ds
->ds_prev
)->ds_creation_txg
);
1289 dsl_dataset_phys(ds
->ds_prev
)->ds_next_snap_obj
= dsobj
;
1290 } else if (next_clones_obj
!= 0) {
1291 dsl_dataset_remove_from_next_clones(ds
->ds_prev
,
1292 dsphys
->ds_next_snap_obj
, tx
);
1293 VERIFY0(zap_add_int(mos
,
1294 next_clones_obj
, dsobj
, tx
));
1299 * If we have a reference-reservation on this dataset, we will
1300 * need to increase the amount of refreservation being charged
1301 * since our unique space is going to zero.
1303 if (ds
->ds_reserved
) {
1305 ASSERT(DS_UNIQUE_IS_ACCURATE(ds
));
1306 delta
= MIN(dsl_dataset_phys(ds
)->ds_unique_bytes
,
1308 dsl_dir_diduse_space(ds
->ds_dir
, DD_USED_REFRSRV
,
1312 dmu_buf_will_dirty(ds
->ds_dbuf
, tx
);
1313 dsl_dataset_phys(ds
)->ds_deadlist_obj
=
1314 dsl_deadlist_clone(&ds
->ds_deadlist
, UINT64_MAX
,
1315 dsl_dataset_phys(ds
)->ds_prev_snap_obj
, tx
);
1316 dsl_deadlist_close(&ds
->ds_deadlist
);
1317 dsl_deadlist_open(&ds
->ds_deadlist
, mos
,
1318 dsl_dataset_phys(ds
)->ds_deadlist_obj
);
1319 dsl_deadlist_add_key(&ds
->ds_deadlist
,
1320 dsl_dataset_phys(ds
)->ds_prev_snap_txg
, tx
);
1322 ASSERT3U(dsl_dataset_phys(ds
)->ds_prev_snap_txg
, <, tx
->tx_txg
);
1323 dsl_dataset_phys(ds
)->ds_prev_snap_obj
= dsobj
;
1324 dsl_dataset_phys(ds
)->ds_prev_snap_txg
= crtxg
;
1325 dsl_dataset_phys(ds
)->ds_unique_bytes
= 0;
1326 if (spa_version(dp
->dp_spa
) >= SPA_VERSION_UNIQUE_ACCURATE
)
1327 dsl_dataset_phys(ds
)->ds_flags
|= DS_FLAG_UNIQUE_ACCURATE
;
1329 VERIFY0(zap_add(mos
, dsl_dataset_phys(ds
)->ds_snapnames_zapobj
,
1330 snapname
, 8, 1, &dsobj
, tx
));
1333 dsl_dataset_rele(ds
->ds_prev
, ds
);
1334 VERIFY0(dsl_dataset_hold_obj(dp
,
1335 dsl_dataset_phys(ds
)->ds_prev_snap_obj
, ds
, &ds
->ds_prev
));
1337 dsl_scan_ds_snapshotted(ds
, tx
);
1339 dsl_dir_snap_cmtime_update(ds
->ds_dir
);
1341 spa_history_log_internal_ds(ds
->ds_prev
, "snapshot", tx
, "");
1345 dsl_dataset_snapshot_sync(void *arg
, dmu_tx_t
*tx
)
1347 dsl_dataset_snapshot_arg_t
*ddsa
= arg
;
1348 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
1351 for (pair
= nvlist_next_nvpair(ddsa
->ddsa_snaps
, NULL
);
1352 pair
!= NULL
; pair
= nvlist_next_nvpair(ddsa
->ddsa_snaps
, pair
)) {
1355 char dsname
[MAXNAMELEN
];
1357 name
= nvpair_name(pair
);
1358 atp
= strchr(name
, '@');
1359 (void) strlcpy(dsname
, name
, atp
- name
+ 1);
1360 VERIFY0(dsl_dataset_hold(dp
, dsname
, FTAG
, &ds
));
1362 dsl_dataset_snapshot_sync_impl(ds
, atp
+ 1, tx
);
1363 if (ddsa
->ddsa_props
!= NULL
) {
1364 dsl_props_set_sync_impl(ds
->ds_prev
,
1365 ZPROP_SRC_LOCAL
, ddsa
->ddsa_props
, tx
);
1367 dsl_dataset_rele(ds
, FTAG
);
1372 * The snapshots must all be in the same pool.
1373 * All-or-nothing: if there are any failures, nothing will be modified.
1376 dsl_dataset_snapshot(nvlist_t
*snaps
, nvlist_t
*props
, nvlist_t
*errors
)
1378 dsl_dataset_snapshot_arg_t ddsa
;
1380 boolean_t needsuspend
;
1384 nvlist_t
*suspended
= NULL
;
1386 pair
= nvlist_next_nvpair(snaps
, NULL
);
1389 firstname
= nvpair_name(pair
);
1391 error
= spa_open(firstname
, &spa
, FTAG
);
1394 needsuspend
= (spa_version(spa
) < SPA_VERSION_FAST_SNAP
);
1395 spa_close(spa
, FTAG
);
1398 suspended
= fnvlist_alloc();
1399 for (pair
= nvlist_next_nvpair(snaps
, NULL
); pair
!= NULL
;
1400 pair
= nvlist_next_nvpair(snaps
, pair
)) {
1401 char fsname
[MAXNAMELEN
];
1402 char *snapname
= nvpair_name(pair
);
1406 atp
= strchr(snapname
, '@');
1408 error
= SET_ERROR(EINVAL
);
1411 (void) strlcpy(fsname
, snapname
, atp
- snapname
+ 1);
1413 error
= zil_suspend(fsname
, &cookie
);
1416 fnvlist_add_uint64(suspended
, fsname
,
1421 ddsa
.ddsa_snaps
= snaps
;
1422 ddsa
.ddsa_props
= props
;
1423 ddsa
.ddsa_errors
= errors
;
1424 ddsa
.ddsa_cr
= CRED();
1427 error
= dsl_sync_task(firstname
, dsl_dataset_snapshot_check
,
1428 dsl_dataset_snapshot_sync
, &ddsa
,
1429 fnvlist_num_pairs(snaps
) * 3, ZFS_SPACE_CHECK_NORMAL
);
1432 if (suspended
!= NULL
) {
1433 for (pair
= nvlist_next_nvpair(suspended
, NULL
); pair
!= NULL
;
1434 pair
= nvlist_next_nvpair(suspended
, pair
)) {
1435 zil_resume((void *)(uintptr_t)
1436 fnvpair_value_uint64(pair
));
1438 fnvlist_free(suspended
);
1444 typedef struct dsl_dataset_snapshot_tmp_arg
{
1445 const char *ddsta_fsname
;
1446 const char *ddsta_snapname
;
1447 minor_t ddsta_cleanup_minor
;
1448 const char *ddsta_htag
;
1449 } dsl_dataset_snapshot_tmp_arg_t
;
1452 dsl_dataset_snapshot_tmp_check(void *arg
, dmu_tx_t
*tx
)
1454 dsl_dataset_snapshot_tmp_arg_t
*ddsta
= arg
;
1455 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
1459 error
= dsl_dataset_hold(dp
, ddsta
->ddsta_fsname
, FTAG
, &ds
);
1463 /* NULL cred means no limit check for tmp snapshot */
1464 error
= dsl_dataset_snapshot_check_impl(ds
, ddsta
->ddsta_snapname
,
1465 tx
, B_FALSE
, 0, NULL
);
1467 dsl_dataset_rele(ds
, FTAG
);
1471 if (spa_version(dp
->dp_spa
) < SPA_VERSION_USERREFS
) {
1472 dsl_dataset_rele(ds
, FTAG
);
1473 return (SET_ERROR(ENOTSUP
));
1475 error
= dsl_dataset_user_hold_check_one(NULL
, ddsta
->ddsta_htag
,
1478 dsl_dataset_rele(ds
, FTAG
);
1482 dsl_dataset_rele(ds
, FTAG
);
1487 dsl_dataset_snapshot_tmp_sync(void *arg
, dmu_tx_t
*tx
)
1489 dsl_dataset_snapshot_tmp_arg_t
*ddsta
= arg
;
1490 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
1493 VERIFY0(dsl_dataset_hold(dp
, ddsta
->ddsta_fsname
, FTAG
, &ds
));
1495 dsl_dataset_snapshot_sync_impl(ds
, ddsta
->ddsta_snapname
, tx
);
1496 dsl_dataset_user_hold_sync_one(ds
->ds_prev
, ddsta
->ddsta_htag
,
1497 ddsta
->ddsta_cleanup_minor
, gethrestime_sec(), tx
);
1498 dsl_destroy_snapshot_sync_impl(ds
->ds_prev
, B_TRUE
, tx
);
1500 dsl_dataset_rele(ds
, FTAG
);
1504 dsl_dataset_snapshot_tmp(const char *fsname
, const char *snapname
,
1505 minor_t cleanup_minor
, const char *htag
)
1507 dsl_dataset_snapshot_tmp_arg_t ddsta
;
1510 boolean_t needsuspend
;
1513 ddsta
.ddsta_fsname
= fsname
;
1514 ddsta
.ddsta_snapname
= snapname
;
1515 ddsta
.ddsta_cleanup_minor
= cleanup_minor
;
1516 ddsta
.ddsta_htag
= htag
;
1518 error
= spa_open(fsname
, &spa
, FTAG
);
1521 needsuspend
= (spa_version(spa
) < SPA_VERSION_FAST_SNAP
);
1522 spa_close(spa
, FTAG
);
1525 error
= zil_suspend(fsname
, &cookie
);
1530 error
= dsl_sync_task(fsname
, dsl_dataset_snapshot_tmp_check
,
1531 dsl_dataset_snapshot_tmp_sync
, &ddsta
, 3, ZFS_SPACE_CHECK_RESERVED
);
1540 dsl_dataset_sync(dsl_dataset_t
*ds
, zio_t
*zio
, dmu_tx_t
*tx
)
1542 ASSERT(dmu_tx_is_syncing(tx
));
1543 ASSERT(ds
->ds_objset
!= NULL
);
1544 ASSERT(dsl_dataset_phys(ds
)->ds_next_snap_obj
== 0);
1547 * in case we had to change ds_fsid_guid when we opened it,
1550 dmu_buf_will_dirty(ds
->ds_dbuf
, tx
);
1551 dsl_dataset_phys(ds
)->ds_fsid_guid
= ds
->ds_fsid_guid
;
1553 dmu_objset_sync(ds
->ds_objset
, zio
, tx
);
1555 if (ds
->ds_need_large_blocks
&& !ds
->ds_large_blocks
) {
1556 dsl_dataset_activate_large_blocks_sync_impl(ds
->ds_object
, tx
);
1557 ds
->ds_large_blocks
= B_TRUE
;
1562 get_clones_stat(dsl_dataset_t
*ds
, nvlist_t
*nv
)
1565 objset_t
*mos
= ds
->ds_dir
->dd_pool
->dp_meta_objset
;
1568 nvlist_t
*propval
= fnvlist_alloc();
1569 nvlist_t
*val
= fnvlist_alloc();
1571 ASSERT(dsl_pool_config_held(ds
->ds_dir
->dd_pool
));
1574 * There may be missing entries in ds_next_clones_obj
1575 * due to a bug in a previous version of the code.
1576 * Only trust it if it has the right number of entries.
1578 if (dsl_dataset_phys(ds
)->ds_next_clones_obj
!= 0) {
1579 VERIFY0(zap_count(mos
, dsl_dataset_phys(ds
)->ds_next_clones_obj
,
1582 if (count
!= dsl_dataset_phys(ds
)->ds_num_children
- 1)
1584 for (zap_cursor_init(&zc
, mos
,
1585 dsl_dataset_phys(ds
)->ds_next_clones_obj
);
1586 zap_cursor_retrieve(&zc
, &za
) == 0;
1587 zap_cursor_advance(&zc
)) {
1588 dsl_dataset_t
*clone
;
1589 char buf
[ZFS_MAXNAMELEN
];
1590 VERIFY0(dsl_dataset_hold_obj(ds
->ds_dir
->dd_pool
,
1591 za
.za_first_integer
, FTAG
, &clone
));
1592 dsl_dir_name(clone
->ds_dir
, buf
);
1593 fnvlist_add_boolean(val
, buf
);
1594 dsl_dataset_rele(clone
, FTAG
);
1596 zap_cursor_fini(&zc
);
1597 fnvlist_add_nvlist(propval
, ZPROP_VALUE
, val
);
1598 fnvlist_add_nvlist(nv
, zfs_prop_to_name(ZFS_PROP_CLONES
), propval
);
1601 nvlist_free(propval
);
1605 dsl_dataset_stats(dsl_dataset_t
*ds
, nvlist_t
*nv
)
1607 dsl_pool_t
*dp
= ds
->ds_dir
->dd_pool
;
1608 uint64_t refd
, avail
, uobjs
, aobjs
, ratio
;
1610 ASSERT(dsl_pool_config_held(dp
));
1612 ratio
= dsl_dataset_phys(ds
)->ds_compressed_bytes
== 0 ? 100 :
1613 (dsl_dataset_phys(ds
)->ds_uncompressed_bytes
* 100 /
1614 dsl_dataset_phys(ds
)->ds_compressed_bytes
);
1616 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_REFRATIO
, ratio
);
1617 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_LOGICALREFERENCED
,
1618 dsl_dataset_phys(ds
)->ds_uncompressed_bytes
);
1620 if (ds
->ds_is_snapshot
) {
1621 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_COMPRESSRATIO
, ratio
);
1622 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_USED
,
1623 dsl_dataset_phys(ds
)->ds_unique_bytes
);
1624 get_clones_stat(ds
, nv
);
1626 if (ds
->ds_prev
!= NULL
&& ds
->ds_prev
!= dp
->dp_origin_snap
) {
1627 char buf
[MAXNAMELEN
];
1628 dsl_dataset_name(ds
->ds_prev
, buf
);
1629 dsl_prop_nvlist_add_string(nv
, ZFS_PROP_PREV_SNAP
, buf
);
1632 dsl_dir_stats(ds
->ds_dir
, nv
);
1635 dsl_dataset_space(ds
, &refd
, &avail
, &uobjs
, &aobjs
);
1636 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_AVAILABLE
, avail
);
1637 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_REFERENCED
, refd
);
1639 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_CREATION
,
1640 dsl_dataset_phys(ds
)->ds_creation_time
);
1641 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_CREATETXG
,
1642 dsl_dataset_phys(ds
)->ds_creation_txg
);
1643 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_REFQUOTA
,
1645 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_REFRESERVATION
,
1647 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_GUID
,
1648 dsl_dataset_phys(ds
)->ds_guid
);
1649 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_UNIQUE
,
1650 dsl_dataset_phys(ds
)->ds_unique_bytes
);
1651 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_OBJSETID
,
1653 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_USERREFS
,
1655 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_DEFER_DESTROY
,
1656 DS_IS_DEFER_DESTROY(ds
) ? 1 : 0);
1658 if (dsl_dataset_phys(ds
)->ds_prev_snap_obj
!= 0) {
1659 uint64_t written
, comp
, uncomp
;
1660 dsl_pool_t
*dp
= ds
->ds_dir
->dd_pool
;
1661 dsl_dataset_t
*prev
;
1663 int err
= dsl_dataset_hold_obj(dp
,
1664 dsl_dataset_phys(ds
)->ds_prev_snap_obj
, FTAG
, &prev
);
1666 err
= dsl_dataset_space_written(prev
, ds
, &written
,
1668 dsl_dataset_rele(prev
, FTAG
);
1670 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_WRITTEN
,
1678 dsl_dataset_fast_stat(dsl_dataset_t
*ds
, dmu_objset_stats_t
*stat
)
1680 dsl_pool_t
*dp
= ds
->ds_dir
->dd_pool
;
1681 ASSERT(dsl_pool_config_held(dp
));
1683 stat
->dds_creation_txg
= dsl_dataset_phys(ds
)->ds_creation_txg
;
1684 stat
->dds_inconsistent
=
1685 dsl_dataset_phys(ds
)->ds_flags
& DS_FLAG_INCONSISTENT
;
1686 stat
->dds_guid
= dsl_dataset_phys(ds
)->ds_guid
;
1687 stat
->dds_origin
[0] = '\0';
1688 if (ds
->ds_is_snapshot
) {
1689 stat
->dds_is_snapshot
= B_TRUE
;
1690 stat
->dds_num_clones
=
1691 dsl_dataset_phys(ds
)->ds_num_children
- 1;
1693 stat
->dds_is_snapshot
= B_FALSE
;
1694 stat
->dds_num_clones
= 0;
1696 if (dsl_dir_is_clone(ds
->ds_dir
)) {
1699 VERIFY0(dsl_dataset_hold_obj(dp
,
1700 dsl_dir_phys(ds
->ds_dir
)->dd_origin_obj
,
1702 dsl_dataset_name(ods
, stat
->dds_origin
);
1703 dsl_dataset_rele(ods
, FTAG
);
1709 dsl_dataset_fsid_guid(dsl_dataset_t
*ds
)
1711 return (ds
->ds_fsid_guid
);
1715 dsl_dataset_space(dsl_dataset_t
*ds
,
1716 uint64_t *refdbytesp
, uint64_t *availbytesp
,
1717 uint64_t *usedobjsp
, uint64_t *availobjsp
)
1719 *refdbytesp
= dsl_dataset_phys(ds
)->ds_referenced_bytes
;
1720 *availbytesp
= dsl_dir_space_available(ds
->ds_dir
, NULL
, 0, TRUE
);
1721 if (ds
->ds_reserved
> dsl_dataset_phys(ds
)->ds_unique_bytes
)
1723 ds
->ds_reserved
- dsl_dataset_phys(ds
)->ds_unique_bytes
;
1724 if (ds
->ds_quota
!= 0) {
1726 * Adjust available bytes according to refquota
1728 if (*refdbytesp
< ds
->ds_quota
)
1729 *availbytesp
= MIN(*availbytesp
,
1730 ds
->ds_quota
- *refdbytesp
);
1734 *usedobjsp
= BP_GET_FILL(&dsl_dataset_phys(ds
)->ds_bp
);
1735 *availobjsp
= DN_MAX_OBJECT
- *usedobjsp
;
1739 dsl_dataset_modified_since_snap(dsl_dataset_t
*ds
, dsl_dataset_t
*snap
)
1741 dsl_pool_t
*dp
= ds
->ds_dir
->dd_pool
;
1743 ASSERT(dsl_pool_config_held(dp
));
1746 if (dsl_dataset_phys(ds
)->ds_bp
.blk_birth
>
1747 dsl_dataset_phys(snap
)->ds_creation_txg
) {
1748 objset_t
*os
, *os_snap
;
1750 * It may be that only the ZIL differs, because it was
1751 * reset in the head. Don't count that as being
1754 if (dmu_objset_from_ds(ds
, &os
) != 0)
1756 if (dmu_objset_from_ds(snap
, &os_snap
) != 0)
1758 return (bcmp(&os
->os_phys
->os_meta_dnode
,
1759 &os_snap
->os_phys
->os_meta_dnode
,
1760 sizeof (os
->os_phys
->os_meta_dnode
)) != 0);
1765 typedef struct dsl_dataset_rename_snapshot_arg
{
1766 const char *ddrsa_fsname
;
1767 const char *ddrsa_oldsnapname
;
1768 const char *ddrsa_newsnapname
;
1769 boolean_t ddrsa_recursive
;
1771 } dsl_dataset_rename_snapshot_arg_t
;
1775 dsl_dataset_rename_snapshot_check_impl(dsl_pool_t
*dp
,
1776 dsl_dataset_t
*hds
, void *arg
)
1778 dsl_dataset_rename_snapshot_arg_t
*ddrsa
= arg
;
1782 error
= dsl_dataset_snap_lookup(hds
, ddrsa
->ddrsa_oldsnapname
, &val
);
1784 /* ignore nonexistent snapshots */
1785 return (error
== ENOENT
? 0 : error
);
1788 /* new name should not exist */
1789 error
= dsl_dataset_snap_lookup(hds
, ddrsa
->ddrsa_newsnapname
, &val
);
1791 error
= SET_ERROR(EEXIST
);
1792 else if (error
== ENOENT
)
1795 /* dataset name + 1 for the "@" + the new snapshot name must fit */
1796 if (dsl_dir_namelen(hds
->ds_dir
) + 1 +
1797 strlen(ddrsa
->ddrsa_newsnapname
) >= MAXNAMELEN
)
1798 error
= SET_ERROR(ENAMETOOLONG
);
1804 dsl_dataset_rename_snapshot_check(void *arg
, dmu_tx_t
*tx
)
1806 dsl_dataset_rename_snapshot_arg_t
*ddrsa
= arg
;
1807 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
1811 error
= dsl_dataset_hold(dp
, ddrsa
->ddrsa_fsname
, FTAG
, &hds
);
1815 if (ddrsa
->ddrsa_recursive
) {
1816 error
= dmu_objset_find_dp(dp
, hds
->ds_dir
->dd_object
,
1817 dsl_dataset_rename_snapshot_check_impl
, ddrsa
,
1820 error
= dsl_dataset_rename_snapshot_check_impl(dp
, hds
, ddrsa
);
1822 dsl_dataset_rele(hds
, FTAG
);
1827 dsl_dataset_rename_snapshot_sync_impl(dsl_pool_t
*dp
,
1828 dsl_dataset_t
*hds
, void *arg
)
1830 dsl_dataset_rename_snapshot_arg_t
*ddrsa
= arg
;
1833 dmu_tx_t
*tx
= ddrsa
->ddrsa_tx
;
1836 error
= dsl_dataset_snap_lookup(hds
, ddrsa
->ddrsa_oldsnapname
, &val
);
1837 ASSERT(error
== 0 || error
== ENOENT
);
1838 if (error
== ENOENT
) {
1839 /* ignore nonexistent snapshots */
1843 VERIFY0(dsl_dataset_hold_obj(dp
, val
, FTAG
, &ds
));
1845 /* log before we change the name */
1846 spa_history_log_internal_ds(ds
, "rename", tx
,
1847 "-> @%s", ddrsa
->ddrsa_newsnapname
);
1849 VERIFY0(dsl_dataset_snap_remove(hds
, ddrsa
->ddrsa_oldsnapname
, tx
,
1851 mutex_enter(&ds
->ds_lock
);
1852 (void) strcpy(ds
->ds_snapname
, ddrsa
->ddrsa_newsnapname
);
1853 mutex_exit(&ds
->ds_lock
);
1854 VERIFY0(zap_add(dp
->dp_meta_objset
,
1855 dsl_dataset_phys(hds
)->ds_snapnames_zapobj
,
1856 ds
->ds_snapname
, 8, 1, &ds
->ds_object
, tx
));
1858 dsl_dataset_rele(ds
, FTAG
);
1863 dsl_dataset_rename_snapshot_sync(void *arg
, dmu_tx_t
*tx
)
1865 dsl_dataset_rename_snapshot_arg_t
*ddrsa
= arg
;
1866 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
1869 VERIFY0(dsl_dataset_hold(dp
, ddrsa
->ddrsa_fsname
, FTAG
, &hds
));
1870 ddrsa
->ddrsa_tx
= tx
;
1871 if (ddrsa
->ddrsa_recursive
) {
1872 VERIFY0(dmu_objset_find_dp(dp
, hds
->ds_dir
->dd_object
,
1873 dsl_dataset_rename_snapshot_sync_impl
, ddrsa
,
1876 VERIFY0(dsl_dataset_rename_snapshot_sync_impl(dp
, hds
, ddrsa
));
1878 dsl_dataset_rele(hds
, FTAG
);
1882 dsl_dataset_rename_snapshot(const char *fsname
,
1883 const char *oldsnapname
, const char *newsnapname
, boolean_t recursive
)
1885 dsl_dataset_rename_snapshot_arg_t ddrsa
;
1887 ddrsa
.ddrsa_fsname
= fsname
;
1888 ddrsa
.ddrsa_oldsnapname
= oldsnapname
;
1889 ddrsa
.ddrsa_newsnapname
= newsnapname
;
1890 ddrsa
.ddrsa_recursive
= recursive
;
1892 return (dsl_sync_task(fsname
, dsl_dataset_rename_snapshot_check
,
1893 dsl_dataset_rename_snapshot_sync
, &ddrsa
,
1894 1, ZFS_SPACE_CHECK_RESERVED
));
1898 * If we're doing an ownership handoff, we need to make sure that there is
1899 * only one long hold on the dataset. We're not allowed to change anything here
1900 * so we don't permanently release the long hold or regular hold here. We want
1901 * to do this only when syncing to avoid the dataset unexpectedly going away
1902 * when we release the long hold.
1905 dsl_dataset_handoff_check(dsl_dataset_t
*ds
, void *owner
, dmu_tx_t
*tx
)
1909 if (!dmu_tx_is_syncing(tx
))
1912 if (owner
!= NULL
) {
1913 VERIFY3P(ds
->ds_owner
, ==, owner
);
1914 dsl_dataset_long_rele(ds
, owner
);
1917 held
= dsl_dataset_long_held(ds
);
1920 dsl_dataset_long_hold(ds
, owner
);
1923 return (SET_ERROR(EBUSY
));
1928 typedef struct dsl_dataset_rollback_arg
{
1929 const char *ddra_fsname
;
1931 nvlist_t
*ddra_result
;
1932 } dsl_dataset_rollback_arg_t
;
1935 dsl_dataset_rollback_check(void *arg
, dmu_tx_t
*tx
)
1937 dsl_dataset_rollback_arg_t
*ddra
= arg
;
1938 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
1940 int64_t unused_refres_delta
;
1943 error
= dsl_dataset_hold(dp
, ddra
->ddra_fsname
, FTAG
, &ds
);
1947 /* must not be a snapshot */
1948 if (ds
->ds_is_snapshot
) {
1949 dsl_dataset_rele(ds
, FTAG
);
1950 return (SET_ERROR(EINVAL
));
1953 /* must have a most recent snapshot */
1954 if (dsl_dataset_phys(ds
)->ds_prev_snap_txg
< TXG_INITIAL
) {
1955 dsl_dataset_rele(ds
, FTAG
);
1956 return (SET_ERROR(EINVAL
));
1959 /* must not have any bookmarks after the most recent snapshot */
1960 nvlist_t
*proprequest
= fnvlist_alloc();
1961 fnvlist_add_boolean(proprequest
, zfs_prop_to_name(ZFS_PROP_CREATETXG
));
1962 nvlist_t
*bookmarks
= fnvlist_alloc();
1963 error
= dsl_get_bookmarks_impl(ds
, proprequest
, bookmarks
);
1964 fnvlist_free(proprequest
);
1967 for (nvpair_t
*pair
= nvlist_next_nvpair(bookmarks
, NULL
);
1968 pair
!= NULL
; pair
= nvlist_next_nvpair(bookmarks
, pair
)) {
1970 fnvlist_lookup_nvlist(fnvpair_value_nvlist(pair
),
1971 zfs_prop_to_name(ZFS_PROP_CREATETXG
));
1972 uint64_t createtxg
= fnvlist_lookup_uint64(valuenv
, "value");
1973 if (createtxg
> dsl_dataset_phys(ds
)->ds_prev_snap_txg
) {
1974 fnvlist_free(bookmarks
);
1975 dsl_dataset_rele(ds
, FTAG
);
1976 return (SET_ERROR(EEXIST
));
1979 fnvlist_free(bookmarks
);
1981 error
= dsl_dataset_handoff_check(ds
, ddra
->ddra_owner
, tx
);
1983 dsl_dataset_rele(ds
, FTAG
);
1988 * Check if the snap we are rolling back to uses more than
1991 if (ds
->ds_quota
!= 0 &&
1992 dsl_dataset_phys(ds
->ds_prev
)->ds_referenced_bytes
> ds
->ds_quota
) {
1993 dsl_dataset_rele(ds
, FTAG
);
1994 return (SET_ERROR(EDQUOT
));
1998 * When we do the clone swap, we will temporarily use more space
1999 * due to the refreservation (the head will no longer have any
2000 * unique space, so the entire amount of the refreservation will need
2001 * to be free). We will immediately destroy the clone, freeing
2002 * this space, but the freeing happens over many txg's.
2004 unused_refres_delta
= (int64_t)MIN(ds
->ds_reserved
,
2005 dsl_dataset_phys(ds
)->ds_unique_bytes
);
2007 if (unused_refres_delta
> 0 &&
2008 unused_refres_delta
>
2009 dsl_dir_space_available(ds
->ds_dir
, NULL
, 0, TRUE
)) {
2010 dsl_dataset_rele(ds
, FTAG
);
2011 return (SET_ERROR(ENOSPC
));
2014 dsl_dataset_rele(ds
, FTAG
);
2019 dsl_dataset_rollback_sync(void *arg
, dmu_tx_t
*tx
)
2021 dsl_dataset_rollback_arg_t
*ddra
= arg
;
2022 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
2023 dsl_dataset_t
*ds
, *clone
;
2025 char namebuf
[ZFS_MAXNAMELEN
];
2027 VERIFY0(dsl_dataset_hold(dp
, ddra
->ddra_fsname
, FTAG
, &ds
));
2029 dsl_dataset_name(ds
->ds_prev
, namebuf
);
2030 fnvlist_add_string(ddra
->ddra_result
, "target", namebuf
);
2032 cloneobj
= dsl_dataset_create_sync(ds
->ds_dir
, "%rollback",
2033 ds
->ds_prev
, DS_CREATE_FLAG_NODIRTY
, kcred
, tx
);
2035 VERIFY0(dsl_dataset_hold_obj(dp
, cloneobj
, FTAG
, &clone
));
2037 dsl_dataset_clone_swap_sync_impl(clone
, ds
, tx
);
2038 dsl_dataset_zero_zil(ds
, tx
);
2040 dsl_destroy_head_sync_impl(clone
, tx
);
2042 dsl_dataset_rele(clone
, FTAG
);
2043 dsl_dataset_rele(ds
, FTAG
);
2047 * Rolls back the given filesystem or volume to the most recent snapshot.
2048 * The name of the most recent snapshot will be returned under key "target"
2049 * in the result nvlist.
2052 * - The existing dataset MUST be owned by the specified owner at entry
2053 * - Upon return, dataset will still be held by the same owner, whether we
2056 * This mode is required any time the existing filesystem is mounted. See
2057 * notes above zfs_suspend_fs() for further details.
2060 dsl_dataset_rollback(const char *fsname
, void *owner
, nvlist_t
*result
)
2062 dsl_dataset_rollback_arg_t ddra
;
2064 ddra
.ddra_fsname
= fsname
;
2065 ddra
.ddra_owner
= owner
;
2066 ddra
.ddra_result
= result
;
2068 return (dsl_sync_task(fsname
, dsl_dataset_rollback_check
,
2069 dsl_dataset_rollback_sync
, &ddra
,
2070 1, ZFS_SPACE_CHECK_RESERVED
));
2073 struct promotenode
{
2078 typedef struct dsl_dataset_promote_arg
{
2079 const char *ddpa_clonename
;
2080 dsl_dataset_t
*ddpa_clone
;
2081 list_t shared_snaps
, origin_snaps
, clone_snaps
;
2082 dsl_dataset_t
*origin_origin
; /* origin of the origin */
2083 uint64_t used
, comp
, uncomp
, unique
, cloneusedsnap
, originusedsnap
;
2086 } dsl_dataset_promote_arg_t
;
2088 static int snaplist_space(list_t
*l
, uint64_t mintxg
, uint64_t *spacep
);
2089 static int promote_hold(dsl_dataset_promote_arg_t
*ddpa
, dsl_pool_t
*dp
,
2091 static void promote_rele(dsl_dataset_promote_arg_t
*ddpa
, void *tag
);
2094 dsl_dataset_promote_check(void *arg
, dmu_tx_t
*tx
)
2096 dsl_dataset_promote_arg_t
*ddpa
= arg
;
2097 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
2099 struct promotenode
*snap
;
2100 dsl_dataset_t
*origin_ds
;
2104 size_t max_snap_len
;
2106 err
= promote_hold(ddpa
, dp
, FTAG
);
2110 hds
= ddpa
->ddpa_clone
;
2111 max_snap_len
= MAXNAMELEN
- strlen(ddpa
->ddpa_clonename
) - 1;
2113 if (dsl_dataset_phys(hds
)->ds_flags
& DS_FLAG_NOPROMOTE
) {
2114 promote_rele(ddpa
, FTAG
);
2115 return (SET_ERROR(EXDEV
));
2119 * Compute and check the amount of space to transfer. Since this is
2120 * so expensive, don't do the preliminary check.
2122 if (!dmu_tx_is_syncing(tx
)) {
2123 promote_rele(ddpa
, FTAG
);
2127 snap
= list_head(&ddpa
->shared_snaps
);
2128 origin_ds
= snap
->ds
;
2130 /* compute origin's new unique space */
2131 snap
= list_tail(&ddpa
->clone_snaps
);
2132 ASSERT3U(dsl_dataset_phys(snap
->ds
)->ds_prev_snap_obj
, ==,
2133 origin_ds
->ds_object
);
2134 dsl_deadlist_space_range(&snap
->ds
->ds_deadlist
,
2135 dsl_dataset_phys(origin_ds
)->ds_prev_snap_txg
, UINT64_MAX
,
2136 &ddpa
->unique
, &unused
, &unused
);
2139 * Walk the snapshots that we are moving
2141 * Compute space to transfer. Consider the incremental changes
2142 * to used by each snapshot:
2143 * (my used) = (prev's used) + (blocks born) - (blocks killed)
2144 * So each snapshot gave birth to:
2145 * (blocks born) = (my used) - (prev's used) + (blocks killed)
2146 * So a sequence would look like:
2147 * (uN - u(N-1) + kN) + ... + (u1 - u0 + k1) + (u0 - 0 + k0)
2148 * Which simplifies to:
2149 * uN + kN + kN-1 + ... + k1 + k0
2150 * Note however, if we stop before we reach the ORIGIN we get:
2151 * uN + kN + kN-1 + ... + kM - uM-1
2154 ddpa
->used
= dsl_dataset_phys(origin_ds
)->ds_referenced_bytes
;
2155 ddpa
->comp
= dsl_dataset_phys(origin_ds
)->ds_compressed_bytes
;
2156 ddpa
->uncomp
= dsl_dataset_phys(origin_ds
)->ds_uncompressed_bytes
;
2157 for (snap
= list_head(&ddpa
->shared_snaps
); snap
;
2158 snap
= list_next(&ddpa
->shared_snaps
, snap
)) {
2159 uint64_t val
, dlused
, dlcomp
, dluncomp
;
2160 dsl_dataset_t
*ds
= snap
->ds
;
2165 * If there are long holds, we won't be able to evict
2168 if (dsl_dataset_long_held(ds
)) {
2169 err
= SET_ERROR(EBUSY
);
2173 /* Check that the snapshot name does not conflict */
2174 VERIFY0(dsl_dataset_get_snapname(ds
));
2175 if (strlen(ds
->ds_snapname
) >= max_snap_len
) {
2176 err
= SET_ERROR(ENAMETOOLONG
);
2179 err
= dsl_dataset_snap_lookup(hds
, ds
->ds_snapname
, &val
);
2181 (void) strcpy(ddpa
->err_ds
, snap
->ds
->ds_snapname
);
2182 err
= SET_ERROR(EEXIST
);
2188 /* The very first snapshot does not have a deadlist */
2189 if (dsl_dataset_phys(ds
)->ds_prev_snap_obj
== 0)
2192 dsl_deadlist_space(&ds
->ds_deadlist
,
2193 &dlused
, &dlcomp
, &dluncomp
);
2194 ddpa
->used
+= dlused
;
2195 ddpa
->comp
+= dlcomp
;
2196 ddpa
->uncomp
+= dluncomp
;
2200 * If we are a clone of a clone then we never reached ORIGIN,
2201 * so we need to subtract out the clone origin's used space.
2203 if (ddpa
->origin_origin
) {
2205 dsl_dataset_phys(ddpa
->origin_origin
)->ds_referenced_bytes
;
2207 dsl_dataset_phys(ddpa
->origin_origin
)->ds_compressed_bytes
;
2209 dsl_dataset_phys(ddpa
->origin_origin
)->
2210 ds_uncompressed_bytes
;
2213 /* Check that there is enough space and limit headroom here */
2214 err
= dsl_dir_transfer_possible(origin_ds
->ds_dir
, hds
->ds_dir
,
2215 0, ss_mv_cnt
, ddpa
->used
, ddpa
->cr
);
2220 * Compute the amounts of space that will be used by snapshots
2221 * after the promotion (for both origin and clone). For each,
2222 * it is the amount of space that will be on all of their
2223 * deadlists (that was not born before their new origin).
2225 if (dsl_dir_phys(hds
->ds_dir
)->dd_flags
& DD_FLAG_USED_BREAKDOWN
) {
2229 * Note, typically this will not be a clone of a clone,
2230 * so dd_origin_txg will be < TXG_INITIAL, so
2231 * these snaplist_space() -> dsl_deadlist_space_range()
2232 * calls will be fast because they do not have to
2233 * iterate over all bps.
2235 snap
= list_head(&ddpa
->origin_snaps
);
2236 err
= snaplist_space(&ddpa
->shared_snaps
,
2237 snap
->ds
->ds_dir
->dd_origin_txg
, &ddpa
->cloneusedsnap
);
2241 err
= snaplist_space(&ddpa
->clone_snaps
,
2242 snap
->ds
->ds_dir
->dd_origin_txg
, &space
);
2245 ddpa
->cloneusedsnap
+= space
;
2247 if (dsl_dir_phys(origin_ds
->ds_dir
)->dd_flags
&
2248 DD_FLAG_USED_BREAKDOWN
) {
2249 err
= snaplist_space(&ddpa
->origin_snaps
,
2250 dsl_dataset_phys(origin_ds
)->ds_creation_txg
,
2251 &ddpa
->originusedsnap
);
2257 promote_rele(ddpa
, FTAG
);
2262 dsl_dataset_promote_sync(void *arg
, dmu_tx_t
*tx
)
2264 dsl_dataset_promote_arg_t
*ddpa
= arg
;
2265 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
2267 struct promotenode
*snap
;
2268 dsl_dataset_t
*origin_ds
;
2269 dsl_dataset_t
*origin_head
;
2271 dsl_dir_t
*odd
= NULL
;
2272 uint64_t oldnext_obj
;
2275 VERIFY0(promote_hold(ddpa
, dp
, FTAG
));
2276 hds
= ddpa
->ddpa_clone
;
2278 ASSERT0(dsl_dataset_phys(hds
)->ds_flags
& DS_FLAG_NOPROMOTE
);
2280 snap
= list_head(&ddpa
->shared_snaps
);
2281 origin_ds
= snap
->ds
;
2284 snap
= list_head(&ddpa
->origin_snaps
);
2285 origin_head
= snap
->ds
;
2288 * We need to explicitly open odd, since origin_ds's dd will be
2291 VERIFY0(dsl_dir_hold_obj(dp
, origin_ds
->ds_dir
->dd_object
,
2294 /* change origin's next snap */
2295 dmu_buf_will_dirty(origin_ds
->ds_dbuf
, tx
);
2296 oldnext_obj
= dsl_dataset_phys(origin_ds
)->ds_next_snap_obj
;
2297 snap
= list_tail(&ddpa
->clone_snaps
);
2298 ASSERT3U(dsl_dataset_phys(snap
->ds
)->ds_prev_snap_obj
, ==,
2299 origin_ds
->ds_object
);
2300 dsl_dataset_phys(origin_ds
)->ds_next_snap_obj
= snap
->ds
->ds_object
;
2302 /* change the origin's next clone */
2303 if (dsl_dataset_phys(origin_ds
)->ds_next_clones_obj
) {
2304 dsl_dataset_remove_from_next_clones(origin_ds
,
2305 snap
->ds
->ds_object
, tx
);
2306 VERIFY0(zap_add_int(dp
->dp_meta_objset
,
2307 dsl_dataset_phys(origin_ds
)->ds_next_clones_obj
,
2312 dmu_buf_will_dirty(dd
->dd_dbuf
, tx
);
2313 ASSERT3U(dsl_dir_phys(dd
)->dd_origin_obj
, ==, origin_ds
->ds_object
);
2314 dsl_dir_phys(dd
)->dd_origin_obj
= dsl_dir_phys(odd
)->dd_origin_obj
;
2315 dd
->dd_origin_txg
= origin_head
->ds_dir
->dd_origin_txg
;
2316 dmu_buf_will_dirty(odd
->dd_dbuf
, tx
);
2317 dsl_dir_phys(odd
)->dd_origin_obj
= origin_ds
->ds_object
;
2318 origin_head
->ds_dir
->dd_origin_txg
=
2319 dsl_dataset_phys(origin_ds
)->ds_creation_txg
;
2321 /* change dd_clone entries */
2322 if (spa_version(dp
->dp_spa
) >= SPA_VERSION_DIR_CLONES
) {
2323 VERIFY0(zap_remove_int(dp
->dp_meta_objset
,
2324 dsl_dir_phys(odd
)->dd_clones
, hds
->ds_object
, tx
));
2325 VERIFY0(zap_add_int(dp
->dp_meta_objset
,
2326 dsl_dir_phys(ddpa
->origin_origin
->ds_dir
)->dd_clones
,
2327 hds
->ds_object
, tx
));
2329 VERIFY0(zap_remove_int(dp
->dp_meta_objset
,
2330 dsl_dir_phys(ddpa
->origin_origin
->ds_dir
)->dd_clones
,
2331 origin_head
->ds_object
, tx
));
2332 if (dsl_dir_phys(dd
)->dd_clones
== 0) {
2333 dsl_dir_phys(dd
)->dd_clones
=
2334 zap_create(dp
->dp_meta_objset
, DMU_OT_DSL_CLONES
,
2335 DMU_OT_NONE
, 0, tx
);
2337 VERIFY0(zap_add_int(dp
->dp_meta_objset
,
2338 dsl_dir_phys(dd
)->dd_clones
, origin_head
->ds_object
, tx
));
2341 /* move snapshots to this dir */
2342 for (snap
= list_head(&ddpa
->shared_snaps
); snap
;
2343 snap
= list_next(&ddpa
->shared_snaps
, snap
)) {
2344 dsl_dataset_t
*ds
= snap
->ds
;
2347 * Property callbacks are registered to a particular
2348 * dsl_dir. Since ours is changing, evict the objset
2349 * so that they will be unregistered from the old dsl_dir.
2351 if (ds
->ds_objset
) {
2352 dmu_objset_evict(ds
->ds_objset
);
2353 ds
->ds_objset
= NULL
;
2356 /* move snap name entry */
2357 VERIFY0(dsl_dataset_get_snapname(ds
));
2358 VERIFY0(dsl_dataset_snap_remove(origin_head
,
2359 ds
->ds_snapname
, tx
, B_TRUE
));
2360 VERIFY0(zap_add(dp
->dp_meta_objset
,
2361 dsl_dataset_phys(hds
)->ds_snapnames_zapobj
, ds
->ds_snapname
,
2362 8, 1, &ds
->ds_object
, tx
));
2363 dsl_fs_ss_count_adjust(hds
->ds_dir
, 1,
2364 DD_FIELD_SNAPSHOT_COUNT
, tx
);
2366 /* change containing dsl_dir */
2367 dmu_buf_will_dirty(ds
->ds_dbuf
, tx
);
2368 ASSERT3U(dsl_dataset_phys(ds
)->ds_dir_obj
, ==, odd
->dd_object
);
2369 dsl_dataset_phys(ds
)->ds_dir_obj
= dd
->dd_object
;
2370 ASSERT3P(ds
->ds_dir
, ==, odd
);
2371 dsl_dir_rele(ds
->ds_dir
, ds
);
2372 VERIFY0(dsl_dir_hold_obj(dp
, dd
->dd_object
,
2373 NULL
, ds
, &ds
->ds_dir
));
2375 /* move any clone references */
2376 if (dsl_dataset_phys(ds
)->ds_next_clones_obj
&&
2377 spa_version(dp
->dp_spa
) >= SPA_VERSION_DIR_CLONES
) {
2381 for (zap_cursor_init(&zc
, dp
->dp_meta_objset
,
2382 dsl_dataset_phys(ds
)->ds_next_clones_obj
);
2383 zap_cursor_retrieve(&zc
, &za
) == 0;
2384 zap_cursor_advance(&zc
)) {
2385 dsl_dataset_t
*cnds
;
2388 if (za
.za_first_integer
== oldnext_obj
) {
2390 * We've already moved the
2391 * origin's reference.
2396 VERIFY0(dsl_dataset_hold_obj(dp
,
2397 za
.za_first_integer
, FTAG
, &cnds
));
2398 o
= dsl_dir_phys(cnds
->ds_dir
)->
2399 dd_head_dataset_obj
;
2401 VERIFY0(zap_remove_int(dp
->dp_meta_objset
,
2402 dsl_dir_phys(odd
)->dd_clones
, o
, tx
));
2403 VERIFY0(zap_add_int(dp
->dp_meta_objset
,
2404 dsl_dir_phys(dd
)->dd_clones
, o
, tx
));
2405 dsl_dataset_rele(cnds
, FTAG
);
2407 zap_cursor_fini(&zc
);
2410 ASSERT(!dsl_prop_hascb(ds
));
2414 * Change space accounting.
2415 * Note, pa->*usedsnap and dd_used_breakdown[SNAP] will either
2416 * both be valid, or both be 0 (resulting in delta == 0). This
2417 * is true for each of {clone,origin} independently.
2420 delta
= ddpa
->cloneusedsnap
-
2421 dsl_dir_phys(dd
)->dd_used_breakdown
[DD_USED_SNAP
];
2422 ASSERT3S(delta
, >=, 0);
2423 ASSERT3U(ddpa
->used
, >=, delta
);
2424 dsl_dir_diduse_space(dd
, DD_USED_SNAP
, delta
, 0, 0, tx
);
2425 dsl_dir_diduse_space(dd
, DD_USED_HEAD
,
2426 ddpa
->used
- delta
, ddpa
->comp
, ddpa
->uncomp
, tx
);
2428 delta
= ddpa
->originusedsnap
-
2429 dsl_dir_phys(odd
)->dd_used_breakdown
[DD_USED_SNAP
];
2430 ASSERT3S(delta
, <=, 0);
2431 ASSERT3U(ddpa
->used
, >=, -delta
);
2432 dsl_dir_diduse_space(odd
, DD_USED_SNAP
, delta
, 0, 0, tx
);
2433 dsl_dir_diduse_space(odd
, DD_USED_HEAD
,
2434 -ddpa
->used
- delta
, -ddpa
->comp
, -ddpa
->uncomp
, tx
);
2436 dsl_dataset_phys(origin_ds
)->ds_unique_bytes
= ddpa
->unique
;
2438 /* log history record */
2439 spa_history_log_internal_ds(hds
, "promote", tx
, "");
2441 dsl_dir_rele(odd
, FTAG
);
2442 promote_rele(ddpa
, FTAG
);
2446 * Make a list of dsl_dataset_t's for the snapshots between first_obj
2447 * (exclusive) and last_obj (inclusive). The list will be in reverse
2448 * order (last_obj will be the list_head()). If first_obj == 0, do all
2449 * snapshots back to this dataset's origin.
2452 snaplist_make(dsl_pool_t
*dp
,
2453 uint64_t first_obj
, uint64_t last_obj
, list_t
*l
, void *tag
)
2455 uint64_t obj
= last_obj
;
2457 list_create(l
, sizeof (struct promotenode
),
2458 offsetof(struct promotenode
, link
));
2460 while (obj
!= first_obj
) {
2462 struct promotenode
*snap
;
2465 err
= dsl_dataset_hold_obj(dp
, obj
, tag
, &ds
);
2466 ASSERT(err
!= ENOENT
);
2471 first_obj
= dsl_dir_phys(ds
->ds_dir
)->dd_origin_obj
;
2473 snap
= kmem_alloc(sizeof (*snap
), KM_SLEEP
);
2475 list_insert_tail(l
, snap
);
2476 obj
= dsl_dataset_phys(ds
)->ds_prev_snap_obj
;
2483 snaplist_space(list_t
*l
, uint64_t mintxg
, uint64_t *spacep
)
2485 struct promotenode
*snap
;
2488 for (snap
= list_head(l
); snap
; snap
= list_next(l
, snap
)) {
2489 uint64_t used
, comp
, uncomp
;
2490 dsl_deadlist_space_range(&snap
->ds
->ds_deadlist
,
2491 mintxg
, UINT64_MAX
, &used
, &comp
, &uncomp
);
2498 snaplist_destroy(list_t
*l
, void *tag
)
2500 struct promotenode
*snap
;
2502 if (l
== NULL
|| !list_link_active(&l
->list_head
))
2505 while ((snap
= list_tail(l
)) != NULL
) {
2506 list_remove(l
, snap
);
2507 dsl_dataset_rele(snap
->ds
, tag
);
2508 kmem_free(snap
, sizeof (*snap
));
2514 promote_hold(dsl_dataset_promote_arg_t
*ddpa
, dsl_pool_t
*dp
, void *tag
)
2518 struct promotenode
*snap
;
2520 error
= dsl_dataset_hold(dp
, ddpa
->ddpa_clonename
, tag
,
2524 dd
= ddpa
->ddpa_clone
->ds_dir
;
2526 if (ddpa
->ddpa_clone
->ds_is_snapshot
||
2527 !dsl_dir_is_clone(dd
)) {
2528 dsl_dataset_rele(ddpa
->ddpa_clone
, tag
);
2529 return (SET_ERROR(EINVAL
));
2532 error
= snaplist_make(dp
, 0, dsl_dir_phys(dd
)->dd_origin_obj
,
2533 &ddpa
->shared_snaps
, tag
);
2537 error
= snaplist_make(dp
, 0, ddpa
->ddpa_clone
->ds_object
,
2538 &ddpa
->clone_snaps
, tag
);
2542 snap
= list_head(&ddpa
->shared_snaps
);
2543 ASSERT3U(snap
->ds
->ds_object
, ==, dsl_dir_phys(dd
)->dd_origin_obj
);
2544 error
= snaplist_make(dp
, dsl_dir_phys(dd
)->dd_origin_obj
,
2545 dsl_dir_phys(snap
->ds
->ds_dir
)->dd_head_dataset_obj
,
2546 &ddpa
->origin_snaps
, tag
);
2550 if (dsl_dir_phys(snap
->ds
->ds_dir
)->dd_origin_obj
!= 0) {
2551 error
= dsl_dataset_hold_obj(dp
,
2552 dsl_dir_phys(snap
->ds
->ds_dir
)->dd_origin_obj
,
2553 tag
, &ddpa
->origin_origin
);
2559 promote_rele(ddpa
, tag
);
2564 promote_rele(dsl_dataset_promote_arg_t
*ddpa
, void *tag
)
2566 snaplist_destroy(&ddpa
->shared_snaps
, tag
);
2567 snaplist_destroy(&ddpa
->clone_snaps
, tag
);
2568 snaplist_destroy(&ddpa
->origin_snaps
, tag
);
2569 if (ddpa
->origin_origin
!= NULL
)
2570 dsl_dataset_rele(ddpa
->origin_origin
, tag
);
2571 dsl_dataset_rele(ddpa
->ddpa_clone
, tag
);
2577 * If it fails due to a conflicting snapshot name, "conflsnap" will be filled
2578 * in with the name. (It must be at least MAXNAMELEN bytes long.)
2581 dsl_dataset_promote(const char *name
, char *conflsnap
)
2583 dsl_dataset_promote_arg_t ddpa
= { 0 };
2589 * We will modify space proportional to the number of
2590 * snapshots. Compute numsnaps.
2592 error
= dmu_objset_hold(name
, FTAG
, &os
);
2595 error
= zap_count(dmu_objset_pool(os
)->dp_meta_objset
,
2596 dsl_dataset_phys(dmu_objset_ds(os
))->ds_snapnames_zapobj
,
2598 dmu_objset_rele(os
, FTAG
);
2602 ddpa
.ddpa_clonename
= name
;
2603 ddpa
.err_ds
= conflsnap
;
2606 return (dsl_sync_task(name
, dsl_dataset_promote_check
,
2607 dsl_dataset_promote_sync
, &ddpa
,
2608 2 + numsnaps
, ZFS_SPACE_CHECK_RESERVED
));
2612 dsl_dataset_clone_swap_check_impl(dsl_dataset_t
*clone
,
2613 dsl_dataset_t
*origin_head
, boolean_t force
, void *owner
, dmu_tx_t
*tx
)
2615 int64_t unused_refres_delta
;
2617 /* they should both be heads */
2618 if (clone
->ds_is_snapshot
||
2619 origin_head
->ds_is_snapshot
)
2620 return (SET_ERROR(EINVAL
));
2622 /* if we are not forcing, the branch point should be just before them */
2623 if (!force
&& clone
->ds_prev
!= origin_head
->ds_prev
)
2624 return (SET_ERROR(EINVAL
));
2626 /* clone should be the clone (unless they are unrelated) */
2627 if (clone
->ds_prev
!= NULL
&&
2628 clone
->ds_prev
!= clone
->ds_dir
->dd_pool
->dp_origin_snap
&&
2629 origin_head
->ds_dir
!= clone
->ds_prev
->ds_dir
)
2630 return (SET_ERROR(EINVAL
));
2632 /* the clone should be a child of the origin */
2633 if (clone
->ds_dir
->dd_parent
!= origin_head
->ds_dir
)
2634 return (SET_ERROR(EINVAL
));
2636 /* origin_head shouldn't be modified unless 'force' */
2638 dsl_dataset_modified_since_snap(origin_head
, origin_head
->ds_prev
))
2639 return (SET_ERROR(ETXTBSY
));
2641 /* origin_head should have no long holds (e.g. is not mounted) */
2642 if (dsl_dataset_handoff_check(origin_head
, owner
, tx
))
2643 return (SET_ERROR(EBUSY
));
2645 /* check amount of any unconsumed refreservation */
2646 unused_refres_delta
=
2647 (int64_t)MIN(origin_head
->ds_reserved
,
2648 dsl_dataset_phys(origin_head
)->ds_unique_bytes
) -
2649 (int64_t)MIN(origin_head
->ds_reserved
,
2650 dsl_dataset_phys(clone
)->ds_unique_bytes
);
2652 if (unused_refres_delta
> 0 &&
2653 unused_refres_delta
>
2654 dsl_dir_space_available(origin_head
->ds_dir
, NULL
, 0, TRUE
))
2655 return (SET_ERROR(ENOSPC
));
2657 /* clone can't be over the head's refquota */
2658 if (origin_head
->ds_quota
!= 0 &&
2659 dsl_dataset_phys(clone
)->ds_referenced_bytes
>
2660 origin_head
->ds_quota
)
2661 return (SET_ERROR(EDQUOT
));
2667 dsl_dataset_clone_swap_sync_impl(dsl_dataset_t
*clone
,
2668 dsl_dataset_t
*origin_head
, dmu_tx_t
*tx
)
2670 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
2671 int64_t unused_refres_delta
;
2673 ASSERT(clone
->ds_reserved
== 0);
2674 ASSERT(origin_head
->ds_quota
== 0 ||
2675 dsl_dataset_phys(clone
)->ds_unique_bytes
<= origin_head
->ds_quota
);
2676 ASSERT3P(clone
->ds_prev
, ==, origin_head
->ds_prev
);
2678 dmu_buf_will_dirty(clone
->ds_dbuf
, tx
);
2679 dmu_buf_will_dirty(origin_head
->ds_dbuf
, tx
);
2681 if (clone
->ds_objset
!= NULL
) {
2682 dmu_objset_evict(clone
->ds_objset
);
2683 clone
->ds_objset
= NULL
;
2686 if (origin_head
->ds_objset
!= NULL
) {
2687 dmu_objset_evict(origin_head
->ds_objset
);
2688 origin_head
->ds_objset
= NULL
;
2691 unused_refres_delta
=
2692 (int64_t)MIN(origin_head
->ds_reserved
,
2693 dsl_dataset_phys(origin_head
)->ds_unique_bytes
) -
2694 (int64_t)MIN(origin_head
->ds_reserved
,
2695 dsl_dataset_phys(clone
)->ds_unique_bytes
);
2698 * Reset origin's unique bytes, if it exists.
2700 if (clone
->ds_prev
) {
2701 dsl_dataset_t
*origin
= clone
->ds_prev
;
2702 uint64_t comp
, uncomp
;
2704 dmu_buf_will_dirty(origin
->ds_dbuf
, tx
);
2705 dsl_deadlist_space_range(&clone
->ds_deadlist
,
2706 dsl_dataset_phys(origin
)->ds_prev_snap_txg
, UINT64_MAX
,
2707 &dsl_dataset_phys(origin
)->ds_unique_bytes
, &comp
, &uncomp
);
2713 tmp
= dsl_dataset_phys(origin_head
)->ds_bp
;
2714 dsl_dataset_phys(origin_head
)->ds_bp
=
2715 dsl_dataset_phys(clone
)->ds_bp
;
2716 dsl_dataset_phys(clone
)->ds_bp
= tmp
;
2719 /* set dd_*_bytes */
2721 int64_t dused
, dcomp
, duncomp
;
2722 uint64_t cdl_used
, cdl_comp
, cdl_uncomp
;
2723 uint64_t odl_used
, odl_comp
, odl_uncomp
;
2725 ASSERT3U(dsl_dir_phys(clone
->ds_dir
)->
2726 dd_used_breakdown
[DD_USED_SNAP
], ==, 0);
2728 dsl_deadlist_space(&clone
->ds_deadlist
,
2729 &cdl_used
, &cdl_comp
, &cdl_uncomp
);
2730 dsl_deadlist_space(&origin_head
->ds_deadlist
,
2731 &odl_used
, &odl_comp
, &odl_uncomp
);
2733 dused
= dsl_dataset_phys(clone
)->ds_referenced_bytes
+
2735 (dsl_dataset_phys(origin_head
)->ds_referenced_bytes
+
2737 dcomp
= dsl_dataset_phys(clone
)->ds_compressed_bytes
+
2739 (dsl_dataset_phys(origin_head
)->ds_compressed_bytes
+
2741 duncomp
= dsl_dataset_phys(clone
)->ds_uncompressed_bytes
+
2743 (dsl_dataset_phys(origin_head
)->ds_uncompressed_bytes
+
2746 dsl_dir_diduse_space(origin_head
->ds_dir
, DD_USED_HEAD
,
2747 dused
, dcomp
, duncomp
, tx
);
2748 dsl_dir_diduse_space(clone
->ds_dir
, DD_USED_HEAD
,
2749 -dused
, -dcomp
, -duncomp
, tx
);
2752 * The difference in the space used by snapshots is the
2753 * difference in snapshot space due to the head's
2754 * deadlist (since that's the only thing that's
2755 * changing that affects the snapused).
2757 dsl_deadlist_space_range(&clone
->ds_deadlist
,
2758 origin_head
->ds_dir
->dd_origin_txg
, UINT64_MAX
,
2759 &cdl_used
, &cdl_comp
, &cdl_uncomp
);
2760 dsl_deadlist_space_range(&origin_head
->ds_deadlist
,
2761 origin_head
->ds_dir
->dd_origin_txg
, UINT64_MAX
,
2762 &odl_used
, &odl_comp
, &odl_uncomp
);
2763 dsl_dir_transfer_space(origin_head
->ds_dir
, cdl_used
- odl_used
,
2764 DD_USED_HEAD
, DD_USED_SNAP
, tx
);
2767 /* swap ds_*_bytes */
2768 SWITCH64(dsl_dataset_phys(origin_head
)->ds_referenced_bytes
,
2769 dsl_dataset_phys(clone
)->ds_referenced_bytes
);
2770 SWITCH64(dsl_dataset_phys(origin_head
)->ds_compressed_bytes
,
2771 dsl_dataset_phys(clone
)->ds_compressed_bytes
);
2772 SWITCH64(dsl_dataset_phys(origin_head
)->ds_uncompressed_bytes
,
2773 dsl_dataset_phys(clone
)->ds_uncompressed_bytes
);
2774 SWITCH64(dsl_dataset_phys(origin_head
)->ds_unique_bytes
,
2775 dsl_dataset_phys(clone
)->ds_unique_bytes
);
2777 /* apply any parent delta for change in unconsumed refreservation */
2778 dsl_dir_diduse_space(origin_head
->ds_dir
, DD_USED_REFRSRV
,
2779 unused_refres_delta
, 0, 0, tx
);
2784 dsl_deadlist_close(&clone
->ds_deadlist
);
2785 dsl_deadlist_close(&origin_head
->ds_deadlist
);
2786 SWITCH64(dsl_dataset_phys(origin_head
)->ds_deadlist_obj
,
2787 dsl_dataset_phys(clone
)->ds_deadlist_obj
);
2788 dsl_deadlist_open(&clone
->ds_deadlist
, dp
->dp_meta_objset
,
2789 dsl_dataset_phys(clone
)->ds_deadlist_obj
);
2790 dsl_deadlist_open(&origin_head
->ds_deadlist
, dp
->dp_meta_objset
,
2791 dsl_dataset_phys(origin_head
)->ds_deadlist_obj
);
2793 dsl_scan_ds_clone_swapped(origin_head
, clone
, tx
);
2795 spa_history_log_internal_ds(clone
, "clone swap", tx
,
2796 "parent=%s", origin_head
->ds_dir
->dd_myname
);
2800 * Given a pool name and a dataset object number in that pool,
2801 * return the name of that dataset.
2804 dsl_dsobj_to_dsname(char *pname
, uint64_t obj
, char *buf
)
2810 error
= dsl_pool_hold(pname
, FTAG
, &dp
);
2814 error
= dsl_dataset_hold_obj(dp
, obj
, FTAG
, &ds
);
2816 dsl_dataset_name(ds
, buf
);
2817 dsl_dataset_rele(ds
, FTAG
);
2819 dsl_pool_rele(dp
, FTAG
);
2825 dsl_dataset_check_quota(dsl_dataset_t
*ds
, boolean_t check_quota
,
2826 uint64_t asize
, uint64_t inflight
, uint64_t *used
, uint64_t *ref_rsrv
)
2830 ASSERT3S(asize
, >, 0);
2833 * *ref_rsrv is the portion of asize that will come from any
2834 * unconsumed refreservation space.
2838 mutex_enter(&ds
->ds_lock
);
2840 * Make a space adjustment for reserved bytes.
2842 if (ds
->ds_reserved
> dsl_dataset_phys(ds
)->ds_unique_bytes
) {
2844 ds
->ds_reserved
- dsl_dataset_phys(ds
)->ds_unique_bytes
);
2846 (ds
->ds_reserved
- dsl_dataset_phys(ds
)->ds_unique_bytes
);
2848 asize
- MIN(asize
, parent_delta(ds
, asize
+ inflight
));
2851 if (!check_quota
|| ds
->ds_quota
== 0) {
2852 mutex_exit(&ds
->ds_lock
);
2856 * If they are requesting more space, and our current estimate
2857 * is over quota, they get to try again unless the actual
2858 * on-disk is over quota and there are no pending changes (which
2859 * may free up space for us).
2861 if (dsl_dataset_phys(ds
)->ds_referenced_bytes
+ inflight
>=
2864 dsl_dataset_phys(ds
)->ds_referenced_bytes
< ds
->ds_quota
)
2865 error
= SET_ERROR(ERESTART
);
2867 error
= SET_ERROR(EDQUOT
);
2869 mutex_exit(&ds
->ds_lock
);
2874 typedef struct dsl_dataset_set_qr_arg
{
2875 const char *ddsqra_name
;
2876 zprop_source_t ddsqra_source
;
2877 uint64_t ddsqra_value
;
2878 } dsl_dataset_set_qr_arg_t
;
2883 dsl_dataset_set_refquota_check(void *arg
, dmu_tx_t
*tx
)
2885 dsl_dataset_set_qr_arg_t
*ddsqra
= arg
;
2886 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
2891 if (spa_version(dp
->dp_spa
) < SPA_VERSION_REFQUOTA
)
2892 return (SET_ERROR(ENOTSUP
));
2894 error
= dsl_dataset_hold(dp
, ddsqra
->ddsqra_name
, FTAG
, &ds
);
2898 if (ds
->ds_is_snapshot
) {
2899 dsl_dataset_rele(ds
, FTAG
);
2900 return (SET_ERROR(EINVAL
));
2903 error
= dsl_prop_predict(ds
->ds_dir
,
2904 zfs_prop_to_name(ZFS_PROP_REFQUOTA
),
2905 ddsqra
->ddsqra_source
, ddsqra
->ddsqra_value
, &newval
);
2907 dsl_dataset_rele(ds
, FTAG
);
2912 dsl_dataset_rele(ds
, FTAG
);
2916 if (newval
< dsl_dataset_phys(ds
)->ds_referenced_bytes
||
2917 newval
< ds
->ds_reserved
) {
2918 dsl_dataset_rele(ds
, FTAG
);
2919 return (SET_ERROR(ENOSPC
));
2922 dsl_dataset_rele(ds
, FTAG
);
2927 dsl_dataset_set_refquota_sync(void *arg
, dmu_tx_t
*tx
)
2929 dsl_dataset_set_qr_arg_t
*ddsqra
= arg
;
2930 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
2934 VERIFY0(dsl_dataset_hold(dp
, ddsqra
->ddsqra_name
, FTAG
, &ds
));
2936 dsl_prop_set_sync_impl(ds
,
2937 zfs_prop_to_name(ZFS_PROP_REFQUOTA
),
2938 ddsqra
->ddsqra_source
, sizeof (ddsqra
->ddsqra_value
), 1,
2939 &ddsqra
->ddsqra_value
, tx
);
2941 VERIFY0(dsl_prop_get_int_ds(ds
,
2942 zfs_prop_to_name(ZFS_PROP_REFQUOTA
), &newval
));
2944 if (ds
->ds_quota
!= newval
) {
2945 dmu_buf_will_dirty(ds
->ds_dbuf
, tx
);
2946 ds
->ds_quota
= newval
;
2948 dsl_dataset_rele(ds
, FTAG
);
2952 dsl_dataset_set_refquota(const char *dsname
, zprop_source_t source
,
2955 dsl_dataset_set_qr_arg_t ddsqra
;
2957 ddsqra
.ddsqra_name
= dsname
;
2958 ddsqra
.ddsqra_source
= source
;
2959 ddsqra
.ddsqra_value
= refquota
;
2961 return (dsl_sync_task(dsname
, dsl_dataset_set_refquota_check
,
2962 dsl_dataset_set_refquota_sync
, &ddsqra
, 0, ZFS_SPACE_CHECK_NONE
));
2966 dsl_dataset_set_refreservation_check(void *arg
, dmu_tx_t
*tx
)
2968 dsl_dataset_set_qr_arg_t
*ddsqra
= arg
;
2969 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
2972 uint64_t newval
, unique
;
2974 if (spa_version(dp
->dp_spa
) < SPA_VERSION_REFRESERVATION
)
2975 return (SET_ERROR(ENOTSUP
));
2977 error
= dsl_dataset_hold(dp
, ddsqra
->ddsqra_name
, FTAG
, &ds
);
2981 if (ds
->ds_is_snapshot
) {
2982 dsl_dataset_rele(ds
, FTAG
);
2983 return (SET_ERROR(EINVAL
));
2986 error
= dsl_prop_predict(ds
->ds_dir
,
2987 zfs_prop_to_name(ZFS_PROP_REFRESERVATION
),
2988 ddsqra
->ddsqra_source
, ddsqra
->ddsqra_value
, &newval
);
2990 dsl_dataset_rele(ds
, FTAG
);
2995 * If we are doing the preliminary check in open context, the
2996 * space estimates may be inaccurate.
2998 if (!dmu_tx_is_syncing(tx
)) {
2999 dsl_dataset_rele(ds
, FTAG
);
3003 mutex_enter(&ds
->ds_lock
);
3004 if (!DS_UNIQUE_IS_ACCURATE(ds
))
3005 dsl_dataset_recalc_head_uniq(ds
);
3006 unique
= dsl_dataset_phys(ds
)->ds_unique_bytes
;
3007 mutex_exit(&ds
->ds_lock
);
3009 if (MAX(unique
, newval
) > MAX(unique
, ds
->ds_reserved
)) {
3010 uint64_t delta
= MAX(unique
, newval
) -
3011 MAX(unique
, ds
->ds_reserved
);
3014 dsl_dir_space_available(ds
->ds_dir
, NULL
, 0, B_TRUE
) ||
3015 (ds
->ds_quota
> 0 && newval
> ds
->ds_quota
)) {
3016 dsl_dataset_rele(ds
, FTAG
);
3017 return (SET_ERROR(ENOSPC
));
3021 dsl_dataset_rele(ds
, FTAG
);
3026 dsl_dataset_set_refreservation_sync_impl(dsl_dataset_t
*ds
,
3027 zprop_source_t source
, uint64_t value
, dmu_tx_t
*tx
)
3033 dsl_prop_set_sync_impl(ds
, zfs_prop_to_name(ZFS_PROP_REFRESERVATION
),
3034 source
, sizeof (value
), 1, &value
, tx
);
3036 VERIFY0(dsl_prop_get_int_ds(ds
,
3037 zfs_prop_to_name(ZFS_PROP_REFRESERVATION
), &newval
));
3039 dmu_buf_will_dirty(ds
->ds_dbuf
, tx
);
3040 mutex_enter(&ds
->ds_dir
->dd_lock
);
3041 mutex_enter(&ds
->ds_lock
);
3042 ASSERT(DS_UNIQUE_IS_ACCURATE(ds
));
3043 unique
= dsl_dataset_phys(ds
)->ds_unique_bytes
;
3044 delta
= MAX(0, (int64_t)(newval
- unique
)) -
3045 MAX(0, (int64_t)(ds
->ds_reserved
- unique
));
3046 ds
->ds_reserved
= newval
;
3047 mutex_exit(&ds
->ds_lock
);
3049 dsl_dir_diduse_space(ds
->ds_dir
, DD_USED_REFRSRV
, delta
, 0, 0, tx
);
3050 mutex_exit(&ds
->ds_dir
->dd_lock
);
3054 dsl_dataset_set_refreservation_sync(void *arg
, dmu_tx_t
*tx
)
3056 dsl_dataset_set_qr_arg_t
*ddsqra
= arg
;
3057 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
3060 VERIFY0(dsl_dataset_hold(dp
, ddsqra
->ddsqra_name
, FTAG
, &ds
));
3061 dsl_dataset_set_refreservation_sync_impl(ds
,
3062 ddsqra
->ddsqra_source
, ddsqra
->ddsqra_value
, tx
);
3063 dsl_dataset_rele(ds
, FTAG
);
3067 dsl_dataset_set_refreservation(const char *dsname
, zprop_source_t source
,
3068 uint64_t refreservation
)
3070 dsl_dataset_set_qr_arg_t ddsqra
;
3072 ddsqra
.ddsqra_name
= dsname
;
3073 ddsqra
.ddsqra_source
= source
;
3074 ddsqra
.ddsqra_value
= refreservation
;
3076 return (dsl_sync_task(dsname
, dsl_dataset_set_refreservation_check
,
3077 dsl_dataset_set_refreservation_sync
, &ddsqra
,
3078 0, ZFS_SPACE_CHECK_NONE
));
3082 * Return (in *usedp) the amount of space written in new that is not
3083 * present in oldsnap. New may be a snapshot or the head. Old must be
3084 * a snapshot before new, in new's filesystem (or its origin). If not then
3085 * fail and return EINVAL.
3087 * The written space is calculated by considering two components: First, we
3088 * ignore any freed space, and calculate the written as new's used space
3089 * minus old's used space. Next, we add in the amount of space that was freed
3090 * between the two snapshots, thus reducing new's used space relative to old's.
3091 * Specifically, this is the space that was born before old->ds_creation_txg,
3092 * and freed before new (ie. on new's deadlist or a previous deadlist).
3094 * space freed [---------------------]
3095 * snapshots ---O-------O--------O-------O------
3099 dsl_dataset_space_written(dsl_dataset_t
*oldsnap
, dsl_dataset_t
*new,
3100 uint64_t *usedp
, uint64_t *compp
, uint64_t *uncompp
)
3104 dsl_pool_t
*dp
= new->ds_dir
->dd_pool
;
3106 ASSERT(dsl_pool_config_held(dp
));
3109 *usedp
+= dsl_dataset_phys(new)->ds_referenced_bytes
;
3110 *usedp
-= dsl_dataset_phys(oldsnap
)->ds_referenced_bytes
;
3113 *compp
+= dsl_dataset_phys(new)->ds_compressed_bytes
;
3114 *compp
-= dsl_dataset_phys(oldsnap
)->ds_compressed_bytes
;
3117 *uncompp
+= dsl_dataset_phys(new)->ds_uncompressed_bytes
;
3118 *uncompp
-= dsl_dataset_phys(oldsnap
)->ds_uncompressed_bytes
;
3120 snapobj
= new->ds_object
;
3121 while (snapobj
!= oldsnap
->ds_object
) {
3122 dsl_dataset_t
*snap
;
3123 uint64_t used
, comp
, uncomp
;
3125 if (snapobj
== new->ds_object
) {
3128 err
= dsl_dataset_hold_obj(dp
, snapobj
, FTAG
, &snap
);
3133 if (dsl_dataset_phys(snap
)->ds_prev_snap_txg
==
3134 dsl_dataset_phys(oldsnap
)->ds_creation_txg
) {
3136 * The blocks in the deadlist can not be born after
3137 * ds_prev_snap_txg, so get the whole deadlist space,
3138 * which is more efficient (especially for old-format
3139 * deadlists). Unfortunately the deadlist code
3140 * doesn't have enough information to make this
3141 * optimization itself.
3143 dsl_deadlist_space(&snap
->ds_deadlist
,
3144 &used
, &comp
, &uncomp
);
3146 dsl_deadlist_space_range(&snap
->ds_deadlist
,
3147 0, dsl_dataset_phys(oldsnap
)->ds_creation_txg
,
3148 &used
, &comp
, &uncomp
);
3155 * If we get to the beginning of the chain of snapshots
3156 * (ds_prev_snap_obj == 0) before oldsnap, then oldsnap
3157 * was not a snapshot of/before new.
3159 snapobj
= dsl_dataset_phys(snap
)->ds_prev_snap_obj
;
3161 dsl_dataset_rele(snap
, FTAG
);
3163 err
= SET_ERROR(EINVAL
);
3172 * Return (in *usedp) the amount of space that will be reclaimed if firstsnap,
3173 * lastsnap, and all snapshots in between are deleted.
3175 * blocks that would be freed [---------------------------]
3176 * snapshots ---O-------O--------O-------O--------O
3177 * firstsnap lastsnap
3179 * This is the set of blocks that were born after the snap before firstsnap,
3180 * (birth > firstsnap->prev_snap_txg) and died before the snap after the
3181 * last snap (ie, is on lastsnap->ds_next->ds_deadlist or an earlier deadlist).
3182 * We calculate this by iterating over the relevant deadlists (from the snap
3183 * after lastsnap, backward to the snap after firstsnap), summing up the
3184 * space on the deadlist that was born after the snap before firstsnap.
3187 dsl_dataset_space_wouldfree(dsl_dataset_t
*firstsnap
,
3188 dsl_dataset_t
*lastsnap
,
3189 uint64_t *usedp
, uint64_t *compp
, uint64_t *uncompp
)
3193 dsl_pool_t
*dp
= firstsnap
->ds_dir
->dd_pool
;
3195 ASSERT(firstsnap
->ds_is_snapshot
);
3196 ASSERT(lastsnap
->ds_is_snapshot
);
3199 * Check that the snapshots are in the same dsl_dir, and firstsnap
3200 * is before lastsnap.
3202 if (firstsnap
->ds_dir
!= lastsnap
->ds_dir
||
3203 dsl_dataset_phys(firstsnap
)->ds_creation_txg
>
3204 dsl_dataset_phys(lastsnap
)->ds_creation_txg
)
3205 return (SET_ERROR(EINVAL
));
3207 *usedp
= *compp
= *uncompp
= 0;
3209 snapobj
= dsl_dataset_phys(lastsnap
)->ds_next_snap_obj
;
3210 while (snapobj
!= firstsnap
->ds_object
) {
3212 uint64_t used
, comp
, uncomp
;
3214 err
= dsl_dataset_hold_obj(dp
, snapobj
, FTAG
, &ds
);
3218 dsl_deadlist_space_range(&ds
->ds_deadlist
,
3219 dsl_dataset_phys(firstsnap
)->ds_prev_snap_txg
, UINT64_MAX
,
3220 &used
, &comp
, &uncomp
);
3225 snapobj
= dsl_dataset_phys(ds
)->ds_prev_snap_obj
;
3226 ASSERT3U(snapobj
, !=, 0);
3227 dsl_dataset_rele(ds
, FTAG
);
3233 dsl_dataset_activate_large_blocks_check(void *arg
, dmu_tx_t
*tx
)
3235 const char *dsname
= arg
;
3237 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
3240 if (!spa_feature_is_enabled(dp
->dp_spa
, SPA_FEATURE_LARGE_BLOCKS
))
3241 return (SET_ERROR(ENOTSUP
));
3243 ASSERT(spa_feature_is_enabled(dp
->dp_spa
,
3244 SPA_FEATURE_EXTENSIBLE_DATASET
));
3246 error
= dsl_dataset_hold(dp
, dsname
, FTAG
, &ds
);
3250 if (ds
->ds_large_blocks
)
3252 dsl_dataset_rele(ds
, FTAG
);
3258 dsl_dataset_activate_large_blocks_sync_impl(uint64_t dsobj
, dmu_tx_t
*tx
)
3260 spa_t
*spa
= dmu_tx_pool(tx
)->dp_spa
;
3261 objset_t
*mos
= dmu_tx_pool(tx
)->dp_meta_objset
;
3264 spa_feature_incr(spa
, SPA_FEATURE_LARGE_BLOCKS
, tx
);
3265 dmu_object_zapify(mos
, dsobj
, DMU_OT_DSL_DATASET
, tx
);
3267 VERIFY0(zap_add(mos
, dsobj
, DS_FIELD_LARGE_BLOCKS
,
3268 sizeof (zero
), 1, &zero
, tx
));
3272 dsl_dataset_activate_large_blocks_sync(void *arg
, dmu_tx_t
*tx
)
3274 const char *dsname
= arg
;
3277 VERIFY0(dsl_dataset_hold(dmu_tx_pool(tx
), dsname
, FTAG
, &ds
));
3279 dsl_dataset_activate_large_blocks_sync_impl(ds
->ds_object
, tx
);
3280 ASSERT(!ds
->ds_large_blocks
);
3281 ds
->ds_large_blocks
= B_TRUE
;
3282 dsl_dataset_rele(ds
, FTAG
);
3286 dsl_dataset_activate_large_blocks(const char *dsname
)
3290 error
= dsl_sync_task(dsname
,
3291 dsl_dataset_activate_large_blocks_check
,
3292 dsl_dataset_activate_large_blocks_sync
, (void *)dsname
,
3293 1, ZFS_SPACE_CHECK_RESERVED
);
3296 * EALREADY indicates that this dataset already supports large blocks.
3298 if (error
== EALREADY
)
3304 * Return TRUE if 'earlier' is an earlier snapshot in 'later's timeline.
3305 * For example, they could both be snapshots of the same filesystem, and
3306 * 'earlier' is before 'later'. Or 'earlier' could be the origin of
3307 * 'later's filesystem. Or 'earlier' could be an older snapshot in the origin's
3308 * filesystem. Or 'earlier' could be the origin's origin.
3310 * If non-zero, earlier_txg is used instead of earlier's ds_creation_txg.
3313 dsl_dataset_is_before(dsl_dataset_t
*later
, dsl_dataset_t
*earlier
,
3314 uint64_t earlier_txg
)
3316 dsl_pool_t
*dp
= later
->ds_dir
->dd_pool
;
3320 ASSERT(dsl_pool_config_held(dp
));
3321 ASSERT(earlier
->ds_is_snapshot
|| earlier_txg
!= 0);
3323 if (earlier_txg
== 0)
3324 earlier_txg
= dsl_dataset_phys(earlier
)->ds_creation_txg
;
3326 if (later
->ds_is_snapshot
&&
3327 earlier_txg
>= dsl_dataset_phys(later
)->ds_creation_txg
)
3330 if (later
->ds_dir
== earlier
->ds_dir
)
3332 if (!dsl_dir_is_clone(later
->ds_dir
))
3335 if (dsl_dir_phys(later
->ds_dir
)->dd_origin_obj
== earlier
->ds_object
)
3337 dsl_dataset_t
*origin
;
3338 error
= dsl_dataset_hold_obj(dp
,
3339 dsl_dir_phys(later
->ds_dir
)->dd_origin_obj
, FTAG
, &origin
);
3342 ret
= dsl_dataset_is_before(origin
, earlier
, earlier_txg
);
3343 dsl_dataset_rele(origin
, FTAG
);
3349 dsl_dataset_zapify(dsl_dataset_t
*ds
, dmu_tx_t
*tx
)
3351 objset_t
*mos
= ds
->ds_dir
->dd_pool
->dp_meta_objset
;
3352 dmu_object_zapify(mos
, ds
->ds_object
, DMU_OT_DSL_DATASET
, tx
);