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, 2015 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>
53 #include <sys/dmu_send.h>
54 #include <sys/zio_checksum.h>
57 * The SPA supports block sizes up to 16MB. However, very large blocks
58 * can have an impact on i/o latency (e.g. tying up a spinning disk for
59 * ~300ms), and also potentially on the memory allocator. Therefore,
60 * we do not allow the recordsize to be set larger than zfs_max_recordsize
61 * (default 1MB). Larger blocks can be created by changing this tunable,
62 * and pools with larger blocks can always be imported and used, regardless
65 int zfs_max_recordsize
= 1 * 1024 * 1024;
67 #define SWITCH64(x, y) \
69 uint64_t __tmp = (x); \
74 #define DS_REF_MAX (1ULL << 62)
76 extern inline dsl_dataset_phys_t
*dsl_dataset_phys(dsl_dataset_t
*ds
);
79 * Figure out how much of this delta should be propogated to the dsl_dir
80 * layer. If there's a refreservation, that space has already been
81 * partially accounted for in our ancestors.
84 parent_delta(dsl_dataset_t
*ds
, int64_t delta
)
86 dsl_dataset_phys_t
*ds_phys
;
87 uint64_t old_bytes
, new_bytes
;
89 if (ds
->ds_reserved
== 0)
92 ds_phys
= dsl_dataset_phys(ds
);
93 old_bytes
= MAX(ds_phys
->ds_unique_bytes
, ds
->ds_reserved
);
94 new_bytes
= MAX(ds_phys
->ds_unique_bytes
+ delta
, ds
->ds_reserved
);
96 ASSERT3U(ABS((int64_t)(new_bytes
- old_bytes
)), <=, ABS(delta
));
97 return (new_bytes
- old_bytes
);
101 dsl_dataset_block_born(dsl_dataset_t
*ds
, const blkptr_t
*bp
, dmu_tx_t
*tx
)
103 int used
= bp_get_dsize_sync(tx
->tx_pool
->dp_spa
, bp
);
104 int compressed
= BP_GET_PSIZE(bp
);
105 int uncompressed
= BP_GET_UCSIZE(bp
);
108 dprintf_bp(bp
, "ds=%p", ds
);
110 ASSERT(dmu_tx_is_syncing(tx
));
111 /* It could have been compressed away to nothing */
114 ASSERT(BP_GET_TYPE(bp
) != DMU_OT_NONE
);
115 ASSERT(DMU_OT_IS_VALID(BP_GET_TYPE(bp
)));
117 dsl_pool_mos_diduse_space(tx
->tx_pool
,
118 used
, compressed
, uncompressed
);
122 dmu_buf_will_dirty(ds
->ds_dbuf
, tx
);
123 mutex_enter(&ds
->ds_lock
);
124 delta
= parent_delta(ds
, used
);
125 dsl_dataset_phys(ds
)->ds_referenced_bytes
+= used
;
126 dsl_dataset_phys(ds
)->ds_compressed_bytes
+= compressed
;
127 dsl_dataset_phys(ds
)->ds_uncompressed_bytes
+= uncompressed
;
128 dsl_dataset_phys(ds
)->ds_unique_bytes
+= used
;
130 if (BP_GET_LSIZE(bp
) > SPA_OLD_MAXBLOCKSIZE
) {
131 ds
->ds_feature_activation_needed
[SPA_FEATURE_LARGE_BLOCKS
] =
135 spa_feature_t f
= zio_checksum_to_feature(BP_GET_CHECKSUM(bp
));
136 if (f
!= SPA_FEATURE_NONE
)
137 ds
->ds_feature_activation_needed
[f
] = B_TRUE
;
139 mutex_exit(&ds
->ds_lock
);
140 dsl_dir_diduse_space(ds
->ds_dir
, DD_USED_HEAD
, delta
,
141 compressed
, uncompressed
, tx
);
142 dsl_dir_transfer_space(ds
->ds_dir
, used
- delta
,
143 DD_USED_REFRSRV
, DD_USED_HEAD
, tx
);
147 dsl_dataset_block_kill(dsl_dataset_t
*ds
, const blkptr_t
*bp
, dmu_tx_t
*tx
,
150 int used
= bp_get_dsize_sync(tx
->tx_pool
->dp_spa
, bp
);
151 int compressed
= BP_GET_PSIZE(bp
);
152 int uncompressed
= BP_GET_UCSIZE(bp
);
157 ASSERT(dmu_tx_is_syncing(tx
));
158 ASSERT(bp
->blk_birth
<= tx
->tx_txg
);
161 dsl_free(tx
->tx_pool
, tx
->tx_txg
, bp
);
162 dsl_pool_mos_diduse_space(tx
->tx_pool
,
163 -used
, -compressed
, -uncompressed
);
166 ASSERT3P(tx
->tx_pool
, ==, ds
->ds_dir
->dd_pool
);
168 ASSERT(!ds
->ds_is_snapshot
);
169 dmu_buf_will_dirty(ds
->ds_dbuf
, tx
);
171 if (bp
->blk_birth
> dsl_dataset_phys(ds
)->ds_prev_snap_txg
) {
174 dprintf_bp(bp
, "freeing ds=%llu", ds
->ds_object
);
175 dsl_free(tx
->tx_pool
, tx
->tx_txg
, bp
);
177 mutex_enter(&ds
->ds_lock
);
178 ASSERT(dsl_dataset_phys(ds
)->ds_unique_bytes
>= used
||
179 !DS_UNIQUE_IS_ACCURATE(ds
));
180 delta
= parent_delta(ds
, -used
);
181 dsl_dataset_phys(ds
)->ds_unique_bytes
-= used
;
182 mutex_exit(&ds
->ds_lock
);
183 dsl_dir_diduse_space(ds
->ds_dir
, DD_USED_HEAD
,
184 delta
, -compressed
, -uncompressed
, tx
);
185 dsl_dir_transfer_space(ds
->ds_dir
, -used
- delta
,
186 DD_USED_REFRSRV
, DD_USED_HEAD
, tx
);
188 dprintf_bp(bp
, "putting on dead list: %s", "");
191 * We are here as part of zio's write done callback,
192 * which means we're a zio interrupt thread. We can't
193 * call dsl_deadlist_insert() now because it may block
194 * waiting for I/O. Instead, put bp on the deferred
195 * queue and let dsl_pool_sync() finish the job.
197 bplist_append(&ds
->ds_pending_deadlist
, bp
);
199 dsl_deadlist_insert(&ds
->ds_deadlist
, bp
, tx
);
201 ASSERT3U(ds
->ds_prev
->ds_object
, ==,
202 dsl_dataset_phys(ds
)->ds_prev_snap_obj
);
203 ASSERT(dsl_dataset_phys(ds
->ds_prev
)->ds_num_children
> 0);
204 /* if (bp->blk_birth > prev prev snap txg) prev unique += bs */
205 if (dsl_dataset_phys(ds
->ds_prev
)->ds_next_snap_obj
==
206 ds
->ds_object
&& bp
->blk_birth
>
207 dsl_dataset_phys(ds
->ds_prev
)->ds_prev_snap_txg
) {
208 dmu_buf_will_dirty(ds
->ds_prev
->ds_dbuf
, tx
);
209 mutex_enter(&ds
->ds_prev
->ds_lock
);
210 dsl_dataset_phys(ds
->ds_prev
)->ds_unique_bytes
+= used
;
211 mutex_exit(&ds
->ds_prev
->ds_lock
);
213 if (bp
->blk_birth
> ds
->ds_dir
->dd_origin_txg
) {
214 dsl_dir_transfer_space(ds
->ds_dir
, used
,
215 DD_USED_HEAD
, DD_USED_SNAP
, tx
);
218 mutex_enter(&ds
->ds_lock
);
219 ASSERT3U(dsl_dataset_phys(ds
)->ds_referenced_bytes
, >=, used
);
220 dsl_dataset_phys(ds
)->ds_referenced_bytes
-= used
;
221 ASSERT3U(dsl_dataset_phys(ds
)->ds_compressed_bytes
, >=, compressed
);
222 dsl_dataset_phys(ds
)->ds_compressed_bytes
-= compressed
;
223 ASSERT3U(dsl_dataset_phys(ds
)->ds_uncompressed_bytes
, >=, uncompressed
);
224 dsl_dataset_phys(ds
)->ds_uncompressed_bytes
-= uncompressed
;
225 mutex_exit(&ds
->ds_lock
);
231 dsl_dataset_prev_snap_txg(dsl_dataset_t
*ds
)
233 uint64_t trysnap
= 0;
238 * The snapshot creation could fail, but that would cause an
239 * incorrect FALSE return, which would only result in an
240 * overestimation of the amount of space that an operation would
241 * consume, which is OK.
243 * There's also a small window where we could miss a pending
244 * snapshot, because we could set the sync task in the quiescing
245 * phase. So this should only be used as a guess.
247 if (ds
->ds_trysnap_txg
>
248 spa_last_synced_txg(ds
->ds_dir
->dd_pool
->dp_spa
))
249 trysnap
= ds
->ds_trysnap_txg
;
250 return (MAX(dsl_dataset_phys(ds
)->ds_prev_snap_txg
, trysnap
));
254 dsl_dataset_block_freeable(dsl_dataset_t
*ds
, const blkptr_t
*bp
,
257 if (blk_birth
<= dsl_dataset_prev_snap_txg(ds
) ||
258 (bp
!= NULL
&& BP_IS_HOLE(bp
)))
261 ddt_prefetch(dsl_dataset_get_spa(ds
), bp
);
267 dsl_dataset_evict(void *dbu
)
269 dsl_dataset_t
*ds
= dbu
;
271 ASSERT(ds
->ds_owner
== NULL
);
275 unique_remove(ds
->ds_fsid_guid
);
277 if (ds
->ds_objset
!= NULL
)
278 dmu_objset_evict(ds
->ds_objset
);
281 dsl_dataset_rele(ds
->ds_prev
, ds
);
285 bplist_destroy(&ds
->ds_pending_deadlist
);
286 if (ds
->ds_deadlist
.dl_os
!= NULL
)
287 dsl_deadlist_close(&ds
->ds_deadlist
);
289 dsl_dir_async_rele(ds
->ds_dir
, ds
);
291 ASSERT(!list_link_active(&ds
->ds_synced_link
));
293 mutex_destroy(&ds
->ds_lock
);
294 mutex_destroy(&ds
->ds_opening_lock
);
295 mutex_destroy(&ds
->ds_sendstream_lock
);
296 refcount_destroy(&ds
->ds_longholds
);
298 kmem_free(ds
, sizeof (dsl_dataset_t
));
302 dsl_dataset_get_snapname(dsl_dataset_t
*ds
)
304 dsl_dataset_phys_t
*headphys
;
307 dsl_pool_t
*dp
= ds
->ds_dir
->dd_pool
;
308 objset_t
*mos
= dp
->dp_meta_objset
;
310 if (ds
->ds_snapname
[0])
312 if (dsl_dataset_phys(ds
)->ds_next_snap_obj
== 0)
315 err
= dmu_bonus_hold(mos
, dsl_dir_phys(ds
->ds_dir
)->dd_head_dataset_obj
,
319 headphys
= headdbuf
->db_data
;
320 err
= zap_value_search(dp
->dp_meta_objset
,
321 headphys
->ds_snapnames_zapobj
, ds
->ds_object
, 0, ds
->ds_snapname
);
322 dmu_buf_rele(headdbuf
, FTAG
);
327 dsl_dataset_snap_lookup(dsl_dataset_t
*ds
, const char *name
, uint64_t *value
)
329 objset_t
*mos
= ds
->ds_dir
->dd_pool
->dp_meta_objset
;
330 uint64_t snapobj
= dsl_dataset_phys(ds
)->ds_snapnames_zapobj
;
334 if (dsl_dataset_phys(ds
)->ds_flags
& DS_FLAG_CI_DATASET
)
339 err
= zap_lookup_norm(mos
, snapobj
, name
, 8, 1,
340 value
, mt
, NULL
, 0, NULL
);
341 if (err
== ENOTSUP
&& mt
== MT_FIRST
)
342 err
= zap_lookup(mos
, snapobj
, name
, 8, 1, value
);
347 dsl_dataset_snap_remove(dsl_dataset_t
*ds
, const char *name
, dmu_tx_t
*tx
,
350 objset_t
*mos
= ds
->ds_dir
->dd_pool
->dp_meta_objset
;
351 uint64_t snapobj
= dsl_dataset_phys(ds
)->ds_snapnames_zapobj
;
355 dsl_dir_snap_cmtime_update(ds
->ds_dir
);
357 if (dsl_dataset_phys(ds
)->ds_flags
& DS_FLAG_CI_DATASET
)
362 err
= zap_remove_norm(mos
, snapobj
, name
, mt
, tx
);
363 if (err
== ENOTSUP
&& mt
== MT_FIRST
)
364 err
= zap_remove(mos
, snapobj
, name
, tx
);
366 if (err
== 0 && adj_cnt
)
367 dsl_fs_ss_count_adjust(ds
->ds_dir
, -1,
368 DD_FIELD_SNAPSHOT_COUNT
, tx
);
374 dsl_dataset_try_add_ref(dsl_pool_t
*dp
, dsl_dataset_t
*ds
, void *tag
)
376 dmu_buf_t
*dbuf
= ds
->ds_dbuf
;
377 boolean_t result
= B_FALSE
;
379 if (dbuf
!= NULL
&& dmu_buf_try_add_ref(dbuf
, dp
->dp_meta_objset
,
380 ds
->ds_object
, DMU_BONUS_BLKID
, tag
)) {
382 if (ds
== dmu_buf_get_user(dbuf
))
385 dmu_buf_rele(dbuf
, tag
);
392 dsl_dataset_hold_obj(dsl_pool_t
*dp
, uint64_t dsobj
, void *tag
,
395 objset_t
*mos
= dp
->dp_meta_objset
;
399 dmu_object_info_t doi
;
401 ASSERT(dsl_pool_config_held(dp
));
403 err
= dmu_bonus_hold(mos
, dsobj
, tag
, &dbuf
);
407 /* Make sure dsobj has the correct object type. */
408 dmu_object_info_from_db(dbuf
, &doi
);
409 if (doi
.doi_bonus_type
!= DMU_OT_DSL_DATASET
) {
410 dmu_buf_rele(dbuf
, tag
);
411 return (SET_ERROR(EINVAL
));
414 ds
= dmu_buf_get_user(dbuf
);
416 dsl_dataset_t
*winner
= NULL
;
418 ds
= kmem_zalloc(sizeof (dsl_dataset_t
), KM_SLEEP
);
420 ds
->ds_object
= dsobj
;
421 ds
->ds_is_snapshot
= dsl_dataset_phys(ds
)->ds_num_children
!= 0;
423 mutex_init(&ds
->ds_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
424 mutex_init(&ds
->ds_opening_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
425 mutex_init(&ds
->ds_sendstream_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
426 refcount_create(&ds
->ds_longholds
);
428 bplist_create(&ds
->ds_pending_deadlist
);
429 dsl_deadlist_open(&ds
->ds_deadlist
,
430 mos
, dsl_dataset_phys(ds
)->ds_deadlist_obj
);
432 list_create(&ds
->ds_sendstreams
, sizeof (dmu_sendarg_t
),
433 offsetof(dmu_sendarg_t
, dsa_link
));
435 if (doi
.doi_type
== DMU_OTN_ZAP_METADATA
) {
436 for (spa_feature_t f
= 0; f
< SPA_FEATURES
; f
++) {
437 if (!(spa_feature_table
[f
].fi_flags
&
438 ZFEATURE_FLAG_PER_DATASET
))
440 err
= zap_contains(mos
, dsobj
,
441 spa_feature_table
[f
].fi_guid
);
443 ds
->ds_feature_inuse
[f
] = B_TRUE
;
445 ASSERT3U(err
, ==, ENOENT
);
451 err
= dsl_dir_hold_obj(dp
,
452 dsl_dataset_phys(ds
)->ds_dir_obj
, NULL
, ds
, &ds
->ds_dir
);
454 mutex_destroy(&ds
->ds_lock
);
455 mutex_destroy(&ds
->ds_opening_lock
);
456 mutex_destroy(&ds
->ds_sendstream_lock
);
457 refcount_destroy(&ds
->ds_longholds
);
458 bplist_destroy(&ds
->ds_pending_deadlist
);
459 dsl_deadlist_close(&ds
->ds_deadlist
);
460 kmem_free(ds
, sizeof (dsl_dataset_t
));
461 dmu_buf_rele(dbuf
, tag
);
465 if (!ds
->ds_is_snapshot
) {
466 ds
->ds_snapname
[0] = '\0';
467 if (dsl_dataset_phys(ds
)->ds_prev_snap_obj
!= 0) {
468 err
= dsl_dataset_hold_obj(dp
,
469 dsl_dataset_phys(ds
)->ds_prev_snap_obj
,
472 if (doi
.doi_type
== DMU_OTN_ZAP_METADATA
) {
473 int zaperr
= zap_lookup(mos
, ds
->ds_object
,
474 DS_FIELD_BOOKMARK_NAMES
,
475 sizeof (ds
->ds_bookmarks
), 1,
477 if (zaperr
!= ENOENT
)
481 if (zfs_flags
& ZFS_DEBUG_SNAPNAMES
)
482 err
= dsl_dataset_get_snapname(ds
);
484 dsl_dataset_phys(ds
)->ds_userrefs_obj
!= 0) {
486 ds
->ds_dir
->dd_pool
->dp_meta_objset
,
487 dsl_dataset_phys(ds
)->ds_userrefs_obj
,
492 if (err
== 0 && !ds
->ds_is_snapshot
) {
493 err
= dsl_prop_get_int_ds(ds
,
494 zfs_prop_to_name(ZFS_PROP_REFRESERVATION
),
497 err
= dsl_prop_get_int_ds(ds
,
498 zfs_prop_to_name(ZFS_PROP_REFQUOTA
),
502 ds
->ds_reserved
= ds
->ds_quota
= 0;
505 dmu_buf_init_user(&ds
->ds_dbu
, dsl_dataset_evict
, &ds
->ds_dbuf
);
507 winner
= dmu_buf_set_user_ie(dbuf
, &ds
->ds_dbu
);
509 if (err
!= 0 || winner
!= NULL
) {
510 bplist_destroy(&ds
->ds_pending_deadlist
);
511 dsl_deadlist_close(&ds
->ds_deadlist
);
513 dsl_dataset_rele(ds
->ds_prev
, ds
);
514 dsl_dir_rele(ds
->ds_dir
, ds
);
515 mutex_destroy(&ds
->ds_lock
);
516 mutex_destroy(&ds
->ds_opening_lock
);
517 mutex_destroy(&ds
->ds_sendstream_lock
);
518 refcount_destroy(&ds
->ds_longholds
);
519 kmem_free(ds
, sizeof (dsl_dataset_t
));
521 dmu_buf_rele(dbuf
, tag
);
527 unique_insert(dsl_dataset_phys(ds
)->ds_fsid_guid
);
530 ASSERT3P(ds
->ds_dbuf
, ==, dbuf
);
531 ASSERT3P(dsl_dataset_phys(ds
), ==, dbuf
->db_data
);
532 ASSERT(dsl_dataset_phys(ds
)->ds_prev_snap_obj
!= 0 ||
533 spa_version(dp
->dp_spa
) < SPA_VERSION_ORIGIN
||
534 dp
->dp_origin_snap
== NULL
|| ds
== dp
->dp_origin_snap
);
540 dsl_dataset_hold(dsl_pool_t
*dp
, const char *name
,
541 void *tag
, dsl_dataset_t
**dsp
)
544 const char *snapname
;
549 err
= dsl_dir_hold(dp
, name
, FTAG
, &dd
, &snapname
);
553 ASSERT(dsl_pool_config_held(dp
));
554 obj
= dsl_dir_phys(dd
)->dd_head_dataset_obj
;
556 err
= dsl_dataset_hold_obj(dp
, obj
, tag
, &ds
);
558 err
= SET_ERROR(ENOENT
);
560 /* we may be looking for a snapshot */
561 if (err
== 0 && snapname
!= NULL
) {
562 dsl_dataset_t
*snap_ds
;
564 if (*snapname
++ != '@') {
565 dsl_dataset_rele(ds
, tag
);
566 dsl_dir_rele(dd
, FTAG
);
567 return (SET_ERROR(ENOENT
));
570 dprintf("looking for snapshot '%s'\n", snapname
);
571 err
= dsl_dataset_snap_lookup(ds
, snapname
, &obj
);
573 err
= dsl_dataset_hold_obj(dp
, obj
, tag
, &snap_ds
);
574 dsl_dataset_rele(ds
, tag
);
577 mutex_enter(&snap_ds
->ds_lock
);
578 if (snap_ds
->ds_snapname
[0] == 0)
579 (void) strlcpy(snap_ds
->ds_snapname
, snapname
,
580 sizeof (snap_ds
->ds_snapname
));
581 mutex_exit(&snap_ds
->ds_lock
);
587 dsl_dir_rele(dd
, FTAG
);
592 dsl_dataset_own_obj(dsl_pool_t
*dp
, uint64_t dsobj
,
593 void *tag
, dsl_dataset_t
**dsp
)
595 int err
= dsl_dataset_hold_obj(dp
, dsobj
, tag
, dsp
);
598 if (!dsl_dataset_tryown(*dsp
, tag
)) {
599 dsl_dataset_rele(*dsp
, tag
);
601 return (SET_ERROR(EBUSY
));
607 dsl_dataset_own(dsl_pool_t
*dp
, const char *name
,
608 void *tag
, dsl_dataset_t
**dsp
)
610 int err
= dsl_dataset_hold(dp
, name
, tag
, dsp
);
613 if (!dsl_dataset_tryown(*dsp
, tag
)) {
614 dsl_dataset_rele(*dsp
, tag
);
615 return (SET_ERROR(EBUSY
));
621 * See the comment above dsl_pool_hold() for details. In summary, a long
622 * hold is used to prevent destruction of a dataset while the pool hold
623 * is dropped, allowing other concurrent operations (e.g. spa_sync()).
625 * The dataset and pool must be held when this function is called. After it
626 * is called, the pool hold may be released while the dataset is still held
630 dsl_dataset_long_hold(dsl_dataset_t
*ds
, void *tag
)
632 ASSERT(dsl_pool_config_held(ds
->ds_dir
->dd_pool
));
633 (void) refcount_add(&ds
->ds_longholds
, tag
);
637 dsl_dataset_long_rele(dsl_dataset_t
*ds
, void *tag
)
639 (void) refcount_remove(&ds
->ds_longholds
, tag
);
642 /* Return B_TRUE if there are any long holds on this dataset. */
644 dsl_dataset_long_held(dsl_dataset_t
*ds
)
646 return (!refcount_is_zero(&ds
->ds_longholds
));
650 dsl_dataset_name(dsl_dataset_t
*ds
, char *name
)
653 (void) strcpy(name
, "mos");
655 dsl_dir_name(ds
->ds_dir
, name
);
656 VERIFY0(dsl_dataset_get_snapname(ds
));
657 if (ds
->ds_snapname
[0]) {
658 (void) strcat(name
, "@");
660 * We use a "recursive" mutex so that we
661 * can call dprintf_ds() with ds_lock held.
663 if (!MUTEX_HELD(&ds
->ds_lock
)) {
664 mutex_enter(&ds
->ds_lock
);
665 (void) strcat(name
, ds
->ds_snapname
);
666 mutex_exit(&ds
->ds_lock
);
668 (void) strcat(name
, ds
->ds_snapname
);
675 dsl_dataset_rele(dsl_dataset_t
*ds
, void *tag
)
677 dmu_buf_rele(ds
->ds_dbuf
, tag
);
681 dsl_dataset_disown(dsl_dataset_t
*ds
, void *tag
)
683 ASSERT3P(ds
->ds_owner
, ==, tag
);
684 ASSERT(ds
->ds_dbuf
!= NULL
);
686 mutex_enter(&ds
->ds_lock
);
688 mutex_exit(&ds
->ds_lock
);
689 dsl_dataset_long_rele(ds
, tag
);
690 dsl_dataset_rele(ds
, tag
);
694 dsl_dataset_tryown(dsl_dataset_t
*ds
, void *tag
)
696 boolean_t gotit
= FALSE
;
698 mutex_enter(&ds
->ds_lock
);
699 if (ds
->ds_owner
== NULL
&& !DS_IS_INCONSISTENT(ds
)) {
701 dsl_dataset_long_hold(ds
, tag
);
704 mutex_exit(&ds
->ds_lock
);
709 dsl_dataset_activate_feature(uint64_t dsobj
, spa_feature_t f
, dmu_tx_t
*tx
)
711 spa_t
*spa
= dmu_tx_pool(tx
)->dp_spa
;
712 objset_t
*mos
= dmu_tx_pool(tx
)->dp_meta_objset
;
715 VERIFY(spa_feature_table
[f
].fi_flags
& ZFEATURE_FLAG_PER_DATASET
);
717 spa_feature_incr(spa
, f
, tx
);
718 dmu_object_zapify(mos
, dsobj
, DMU_OT_DSL_DATASET
, tx
);
720 VERIFY0(zap_add(mos
, dsobj
, spa_feature_table
[f
].fi_guid
,
721 sizeof (zero
), 1, &zero
, tx
));
725 dsl_dataset_deactivate_feature(uint64_t dsobj
, spa_feature_t f
, dmu_tx_t
*tx
)
727 spa_t
*spa
= dmu_tx_pool(tx
)->dp_spa
;
728 objset_t
*mos
= dmu_tx_pool(tx
)->dp_meta_objset
;
730 VERIFY(spa_feature_table
[f
].fi_flags
& ZFEATURE_FLAG_PER_DATASET
);
732 VERIFY0(zap_remove(mos
, dsobj
, spa_feature_table
[f
].fi_guid
, tx
));
733 spa_feature_decr(spa
, f
, tx
);
737 dsl_dataset_create_sync_dd(dsl_dir_t
*dd
, dsl_dataset_t
*origin
,
738 uint64_t flags
, dmu_tx_t
*tx
)
740 dsl_pool_t
*dp
= dd
->dd_pool
;
742 dsl_dataset_phys_t
*dsphys
;
744 objset_t
*mos
= dp
->dp_meta_objset
;
747 origin
= dp
->dp_origin_snap
;
749 ASSERT(origin
== NULL
|| origin
->ds_dir
->dd_pool
== dp
);
750 ASSERT(origin
== NULL
|| dsl_dataset_phys(origin
)->ds_num_children
> 0);
751 ASSERT(dmu_tx_is_syncing(tx
));
752 ASSERT(dsl_dir_phys(dd
)->dd_head_dataset_obj
== 0);
754 dsobj
= dmu_object_alloc(mos
, DMU_OT_DSL_DATASET
, 0,
755 DMU_OT_DSL_DATASET
, sizeof (dsl_dataset_phys_t
), tx
);
756 VERIFY0(dmu_bonus_hold(mos
, dsobj
, FTAG
, &dbuf
));
757 dmu_buf_will_dirty(dbuf
, tx
);
758 dsphys
= dbuf
->db_data
;
759 bzero(dsphys
, sizeof (dsl_dataset_phys_t
));
760 dsphys
->ds_dir_obj
= dd
->dd_object
;
761 dsphys
->ds_flags
= flags
;
762 dsphys
->ds_fsid_guid
= unique_create();
763 (void) random_get_pseudo_bytes((void*)&dsphys
->ds_guid
,
764 sizeof (dsphys
->ds_guid
));
765 dsphys
->ds_snapnames_zapobj
=
766 zap_create_norm(mos
, U8_TEXTPREP_TOUPPER
, DMU_OT_DSL_DS_SNAP_MAP
,
768 dsphys
->ds_creation_time
= gethrestime_sec();
769 dsphys
->ds_creation_txg
= tx
->tx_txg
== TXG_INITIAL
? 1 : tx
->tx_txg
;
771 if (origin
== NULL
) {
772 dsphys
->ds_deadlist_obj
= dsl_deadlist_alloc(mos
, tx
);
774 dsl_dataset_t
*ohds
; /* head of the origin snapshot */
776 dsphys
->ds_prev_snap_obj
= origin
->ds_object
;
777 dsphys
->ds_prev_snap_txg
=
778 dsl_dataset_phys(origin
)->ds_creation_txg
;
779 dsphys
->ds_referenced_bytes
=
780 dsl_dataset_phys(origin
)->ds_referenced_bytes
;
781 dsphys
->ds_compressed_bytes
=
782 dsl_dataset_phys(origin
)->ds_compressed_bytes
;
783 dsphys
->ds_uncompressed_bytes
=
784 dsl_dataset_phys(origin
)->ds_uncompressed_bytes
;
785 dsphys
->ds_bp
= dsl_dataset_phys(origin
)->ds_bp
;
788 * Inherit flags that describe the dataset's contents
789 * (INCONSISTENT) or properties (Case Insensitive).
791 dsphys
->ds_flags
|= dsl_dataset_phys(origin
)->ds_flags
&
792 (DS_FLAG_INCONSISTENT
| DS_FLAG_CI_DATASET
);
794 for (spa_feature_t f
= 0; f
< SPA_FEATURES
; f
++) {
795 if (origin
->ds_feature_inuse
[f
])
796 dsl_dataset_activate_feature(dsobj
, f
, tx
);
799 dmu_buf_will_dirty(origin
->ds_dbuf
, tx
);
800 dsl_dataset_phys(origin
)->ds_num_children
++;
802 VERIFY0(dsl_dataset_hold_obj(dp
,
803 dsl_dir_phys(origin
->ds_dir
)->dd_head_dataset_obj
,
805 dsphys
->ds_deadlist_obj
= dsl_deadlist_clone(&ohds
->ds_deadlist
,
806 dsphys
->ds_prev_snap_txg
, dsphys
->ds_prev_snap_obj
, tx
);
807 dsl_dataset_rele(ohds
, FTAG
);
809 if (spa_version(dp
->dp_spa
) >= SPA_VERSION_NEXT_CLONES
) {
810 if (dsl_dataset_phys(origin
)->ds_next_clones_obj
== 0) {
811 dsl_dataset_phys(origin
)->ds_next_clones_obj
=
813 DMU_OT_NEXT_CLONES
, DMU_OT_NONE
, 0, tx
);
815 VERIFY0(zap_add_int(mos
,
816 dsl_dataset_phys(origin
)->ds_next_clones_obj
,
820 dmu_buf_will_dirty(dd
->dd_dbuf
, tx
);
821 dsl_dir_phys(dd
)->dd_origin_obj
= origin
->ds_object
;
822 if (spa_version(dp
->dp_spa
) >= SPA_VERSION_DIR_CLONES
) {
823 if (dsl_dir_phys(origin
->ds_dir
)->dd_clones
== 0) {
824 dmu_buf_will_dirty(origin
->ds_dir
->dd_dbuf
, tx
);
825 dsl_dir_phys(origin
->ds_dir
)->dd_clones
=
827 DMU_OT_DSL_CLONES
, DMU_OT_NONE
, 0, tx
);
829 VERIFY0(zap_add_int(mos
,
830 dsl_dir_phys(origin
->ds_dir
)->dd_clones
,
835 if (spa_version(dp
->dp_spa
) >= SPA_VERSION_UNIQUE_ACCURATE
)
836 dsphys
->ds_flags
|= DS_FLAG_UNIQUE_ACCURATE
;
838 dmu_buf_rele(dbuf
, FTAG
);
840 dmu_buf_will_dirty(dd
->dd_dbuf
, tx
);
841 dsl_dir_phys(dd
)->dd_head_dataset_obj
= dsobj
;
847 dsl_dataset_zero_zil(dsl_dataset_t
*ds
, dmu_tx_t
*tx
)
851 VERIFY0(dmu_objset_from_ds(ds
, &os
));
852 bzero(&os
->os_zil_header
, sizeof (os
->os_zil_header
));
853 dsl_dataset_dirty(ds
, tx
);
857 dsl_dataset_create_sync(dsl_dir_t
*pdd
, const char *lastname
,
858 dsl_dataset_t
*origin
, uint64_t flags
, cred_t
*cr
, dmu_tx_t
*tx
)
860 dsl_pool_t
*dp
= pdd
->dd_pool
;
861 uint64_t dsobj
, ddobj
;
864 ASSERT(dmu_tx_is_syncing(tx
));
865 ASSERT(lastname
[0] != '@');
867 ddobj
= dsl_dir_create_sync(dp
, pdd
, lastname
, tx
);
868 VERIFY0(dsl_dir_hold_obj(dp
, ddobj
, lastname
, FTAG
, &dd
));
870 dsobj
= dsl_dataset_create_sync_dd(dd
, origin
,
871 flags
& ~DS_CREATE_FLAG_NODIRTY
, tx
);
873 dsl_deleg_set_create_perms(dd
, tx
, cr
);
876 * Since we're creating a new node we know it's a leaf, so we can
877 * initialize the counts if the limit feature is active.
879 if (spa_feature_is_active(dp
->dp_spa
, SPA_FEATURE_FS_SS_LIMIT
)) {
881 objset_t
*os
= dd
->dd_pool
->dp_meta_objset
;
883 dsl_dir_zapify(dd
, tx
);
884 VERIFY0(zap_add(os
, dd
->dd_object
, DD_FIELD_FILESYSTEM_COUNT
,
885 sizeof (cnt
), 1, &cnt
, tx
));
886 VERIFY0(zap_add(os
, dd
->dd_object
, DD_FIELD_SNAPSHOT_COUNT
,
887 sizeof (cnt
), 1, &cnt
, tx
));
890 dsl_dir_rele(dd
, FTAG
);
893 * If we are creating a clone, make sure we zero out any stale
894 * data from the origin snapshots zil header.
896 if (origin
!= NULL
&& !(flags
& DS_CREATE_FLAG_NODIRTY
)) {
899 VERIFY0(dsl_dataset_hold_obj(dp
, dsobj
, FTAG
, &ds
));
900 dsl_dataset_zero_zil(ds
, tx
);
901 dsl_dataset_rele(ds
, FTAG
);
908 * The unique space in the head dataset can be calculated by subtracting
909 * the space used in the most recent snapshot, that is still being used
910 * in this file system, from the space currently in use. To figure out
911 * the space in the most recent snapshot still in use, we need to take
912 * the total space used in the snapshot and subtract out the space that
913 * has been freed up since the snapshot was taken.
916 dsl_dataset_recalc_head_uniq(dsl_dataset_t
*ds
)
919 uint64_t dlused
, dlcomp
, dluncomp
;
921 ASSERT(!ds
->ds_is_snapshot
);
923 if (dsl_dataset_phys(ds
)->ds_prev_snap_obj
!= 0)
924 mrs_used
= dsl_dataset_phys(ds
->ds_prev
)->ds_referenced_bytes
;
928 dsl_deadlist_space(&ds
->ds_deadlist
, &dlused
, &dlcomp
, &dluncomp
);
930 ASSERT3U(dlused
, <=, mrs_used
);
931 dsl_dataset_phys(ds
)->ds_unique_bytes
=
932 dsl_dataset_phys(ds
)->ds_referenced_bytes
- (mrs_used
- dlused
);
934 if (spa_version(ds
->ds_dir
->dd_pool
->dp_spa
) >=
935 SPA_VERSION_UNIQUE_ACCURATE
)
936 dsl_dataset_phys(ds
)->ds_flags
|= DS_FLAG_UNIQUE_ACCURATE
;
940 dsl_dataset_remove_from_next_clones(dsl_dataset_t
*ds
, uint64_t obj
,
943 objset_t
*mos
= ds
->ds_dir
->dd_pool
->dp_meta_objset
;
947 ASSERT(dsl_dataset_phys(ds
)->ds_num_children
>= 2);
948 err
= zap_remove_int(mos
, dsl_dataset_phys(ds
)->ds_next_clones_obj
,
951 * The err should not be ENOENT, but a bug in a previous version
952 * of the code could cause upgrade_clones_cb() to not set
953 * ds_next_snap_obj when it should, leading to a missing entry.
954 * If we knew that the pool was created after
955 * SPA_VERSION_NEXT_CLONES, we could assert that it isn't
956 * ENOENT. However, at least we can check that we don't have
957 * too many entries in the next_clones_obj even after failing to
962 ASSERT0(zap_count(mos
, dsl_dataset_phys(ds
)->ds_next_clones_obj
,
964 ASSERT3U(count
, <=, dsl_dataset_phys(ds
)->ds_num_children
- 2);
969 dsl_dataset_get_blkptr(dsl_dataset_t
*ds
)
971 return (&dsl_dataset_phys(ds
)->ds_bp
);
975 dsl_dataset_set_blkptr(dsl_dataset_t
*ds
, blkptr_t
*bp
, dmu_tx_t
*tx
)
977 ASSERT(dmu_tx_is_syncing(tx
));
978 /* If it's the meta-objset, set dp_meta_rootbp */
980 tx
->tx_pool
->dp_meta_rootbp
= *bp
;
982 dmu_buf_will_dirty(ds
->ds_dbuf
, tx
);
983 dsl_dataset_phys(ds
)->ds_bp
= *bp
;
988 dsl_dataset_get_spa(dsl_dataset_t
*ds
)
990 return (ds
->ds_dir
->dd_pool
->dp_spa
);
994 dsl_dataset_dirty(dsl_dataset_t
*ds
, dmu_tx_t
*tx
)
998 if (ds
== NULL
) /* this is the meta-objset */
1001 ASSERT(ds
->ds_objset
!= NULL
);
1003 if (dsl_dataset_phys(ds
)->ds_next_snap_obj
!= 0)
1004 panic("dirtying snapshot!");
1006 dp
= ds
->ds_dir
->dd_pool
;
1008 if (txg_list_add(&dp
->dp_dirty_datasets
, ds
, tx
->tx_txg
)) {
1009 /* up the hold count until we can be written out */
1010 dmu_buf_add_ref(ds
->ds_dbuf
, ds
);
1015 dsl_dataset_is_dirty(dsl_dataset_t
*ds
)
1017 for (int t
= 0; t
< TXG_SIZE
; t
++) {
1018 if (txg_list_member(&ds
->ds_dir
->dd_pool
->dp_dirty_datasets
,
1026 dsl_dataset_snapshot_reserve_space(dsl_dataset_t
*ds
, dmu_tx_t
*tx
)
1030 if (!dmu_tx_is_syncing(tx
))
1034 * If there's an fs-only reservation, any blocks that might become
1035 * owned by the snapshot dataset must be accommodated by space
1036 * outside of the reservation.
1038 ASSERT(ds
->ds_reserved
== 0 || DS_UNIQUE_IS_ACCURATE(ds
));
1039 asize
= MIN(dsl_dataset_phys(ds
)->ds_unique_bytes
, ds
->ds_reserved
);
1040 if (asize
> dsl_dir_space_available(ds
->ds_dir
, NULL
, 0, TRUE
))
1041 return (SET_ERROR(ENOSPC
));
1044 * Propagate any reserved space for this snapshot to other
1045 * snapshot checks in this sync group.
1048 dsl_dir_willuse_space(ds
->ds_dir
, asize
, tx
);
1053 typedef struct dsl_dataset_snapshot_arg
{
1054 nvlist_t
*ddsa_snaps
;
1055 nvlist_t
*ddsa_props
;
1056 nvlist_t
*ddsa_errors
;
1058 } dsl_dataset_snapshot_arg_t
;
1061 dsl_dataset_snapshot_check_impl(dsl_dataset_t
*ds
, const char *snapname
,
1062 dmu_tx_t
*tx
, boolean_t recv
, uint64_t cnt
, cred_t
*cr
)
1067 ds
->ds_trysnap_txg
= tx
->tx_txg
;
1069 if (!dmu_tx_is_syncing(tx
))
1073 * We don't allow multiple snapshots of the same txg. If there
1074 * is already one, try again.
1076 if (dsl_dataset_phys(ds
)->ds_prev_snap_txg
>= tx
->tx_txg
)
1077 return (SET_ERROR(EAGAIN
));
1080 * Check for conflicting snapshot name.
1082 error
= dsl_dataset_snap_lookup(ds
, snapname
, &value
);
1084 return (SET_ERROR(EEXIST
));
1085 if (error
!= ENOENT
)
1089 * We don't allow taking snapshots of inconsistent datasets, such as
1090 * those into which we are currently receiving. However, if we are
1091 * creating this snapshot as part of a receive, this check will be
1092 * executed atomically with respect to the completion of the receive
1093 * itself but prior to the clearing of DS_FLAG_INCONSISTENT; in this
1094 * case we ignore this, knowing it will be fixed up for us shortly in
1095 * dmu_recv_end_sync().
1097 if (!recv
&& DS_IS_INCONSISTENT(ds
))
1098 return (SET_ERROR(EBUSY
));
1101 * Skip the check for temporary snapshots or if we have already checked
1102 * the counts in dsl_dataset_snapshot_check. This means we really only
1103 * check the count here when we're receiving a stream.
1105 if (cnt
!= 0 && cr
!= NULL
) {
1106 error
= dsl_fs_ss_limit_check(ds
->ds_dir
, cnt
,
1107 ZFS_PROP_SNAPSHOT_LIMIT
, NULL
, cr
);
1112 error
= dsl_dataset_snapshot_reserve_space(ds
, tx
);
1120 dsl_dataset_snapshot_check(void *arg
, dmu_tx_t
*tx
)
1122 dsl_dataset_snapshot_arg_t
*ddsa
= arg
;
1123 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
1128 * Pre-compute how many total new snapshots will be created for each
1129 * level in the tree and below. This is needed for validating the
1130 * snapshot limit when either taking a recursive snapshot or when
1131 * taking multiple snapshots.
1133 * The problem is that the counts are not actually adjusted when
1134 * we are checking, only when we finally sync. For a single snapshot,
1135 * this is easy, the count will increase by 1 at each node up the tree,
1136 * but its more complicated for the recursive/multiple snapshot case.
1138 * The dsl_fs_ss_limit_check function does recursively check the count
1139 * at each level up the tree but since it is validating each snapshot
1140 * independently we need to be sure that we are validating the complete
1141 * count for the entire set of snapshots. We do this by rolling up the
1142 * counts for each component of the name into an nvlist and then
1143 * checking each of those cases with the aggregated count.
1145 * This approach properly handles not only the recursive snapshot
1146 * case (where we get all of those on the ddsa_snaps list) but also
1147 * the sibling case (e.g. snapshot a/b and a/c so that we will also
1148 * validate the limit on 'a' using a count of 2).
1150 * We validate the snapshot names in the third loop and only report
1153 if (dmu_tx_is_syncing(tx
)) {
1154 nvlist_t
*cnt_track
= NULL
;
1155 cnt_track
= fnvlist_alloc();
1157 /* Rollup aggregated counts into the cnt_track list */
1158 for (pair
= nvlist_next_nvpair(ddsa
->ddsa_snaps
, NULL
);
1160 pair
= nvlist_next_nvpair(ddsa
->ddsa_snaps
, pair
)) {
1163 char nm
[MAXPATHLEN
];
1165 (void) strlcpy(nm
, nvpair_name(pair
), sizeof (nm
));
1166 pdelim
= strchr(nm
, '@');
1172 if (nvlist_lookup_uint64(cnt_track
, nm
,
1174 /* update existing entry */
1175 fnvlist_add_uint64(cnt_track
, nm
,
1179 fnvlist_add_uint64(cnt_track
, nm
, 1);
1182 pdelim
= strrchr(nm
, '/');
1185 } while (pdelim
!= NULL
);
1188 /* Check aggregated counts at each level */
1189 for (pair
= nvlist_next_nvpair(cnt_track
, NULL
);
1190 pair
!= NULL
; pair
= nvlist_next_nvpair(cnt_track
, pair
)) {
1196 name
= nvpair_name(pair
);
1197 cnt
= fnvpair_value_uint64(pair
);
1200 error
= dsl_dataset_hold(dp
, name
, FTAG
, &ds
);
1202 error
= dsl_fs_ss_limit_check(ds
->ds_dir
, cnt
,
1203 ZFS_PROP_SNAPSHOT_LIMIT
, NULL
,
1205 dsl_dataset_rele(ds
, FTAG
);
1209 if (ddsa
->ddsa_errors
!= NULL
)
1210 fnvlist_add_int32(ddsa
->ddsa_errors
,
1213 /* only report one error for this check */
1217 nvlist_free(cnt_track
);
1220 for (pair
= nvlist_next_nvpair(ddsa
->ddsa_snaps
, NULL
);
1221 pair
!= NULL
; pair
= nvlist_next_nvpair(ddsa
->ddsa_snaps
, pair
)) {
1225 char dsname
[MAXNAMELEN
];
1227 name
= nvpair_name(pair
);
1228 if (strlen(name
) >= MAXNAMELEN
)
1229 error
= SET_ERROR(ENAMETOOLONG
);
1231 atp
= strchr(name
, '@');
1233 error
= SET_ERROR(EINVAL
);
1235 (void) strlcpy(dsname
, name
, atp
- name
+ 1);
1238 error
= dsl_dataset_hold(dp
, dsname
, FTAG
, &ds
);
1240 /* passing 0/NULL skips dsl_fs_ss_limit_check */
1241 error
= dsl_dataset_snapshot_check_impl(ds
,
1242 atp
+ 1, tx
, B_FALSE
, 0, NULL
);
1243 dsl_dataset_rele(ds
, FTAG
);
1247 if (ddsa
->ddsa_errors
!= NULL
) {
1248 fnvlist_add_int32(ddsa
->ddsa_errors
,
1259 dsl_dataset_snapshot_sync_impl(dsl_dataset_t
*ds
, const char *snapname
,
1262 static zil_header_t zero_zil
;
1264 dsl_pool_t
*dp
= ds
->ds_dir
->dd_pool
;
1266 dsl_dataset_phys_t
*dsphys
;
1267 uint64_t dsobj
, crtxg
;
1268 objset_t
*mos
= dp
->dp_meta_objset
;
1271 ASSERT(RRW_WRITE_HELD(&dp
->dp_config_rwlock
));
1274 * If we are on an old pool, the zil must not be active, in which
1275 * case it will be zeroed. Usually zil_suspend() accomplishes this.
1277 ASSERT(spa_version(dmu_tx_pool(tx
)->dp_spa
) >= SPA_VERSION_FAST_SNAP
||
1278 dmu_objset_from_ds(ds
, &os
) != 0 ||
1279 bcmp(&os
->os_phys
->os_zil_header
, &zero_zil
,
1280 sizeof (zero_zil
)) == 0);
1282 dsl_fs_ss_count_adjust(ds
->ds_dir
, 1, DD_FIELD_SNAPSHOT_COUNT
, tx
);
1285 * The origin's ds_creation_txg has to be < TXG_INITIAL
1287 if (strcmp(snapname
, ORIGIN_DIR_NAME
) == 0)
1292 dsobj
= dmu_object_alloc(mos
, DMU_OT_DSL_DATASET
, 0,
1293 DMU_OT_DSL_DATASET
, sizeof (dsl_dataset_phys_t
), tx
);
1294 VERIFY0(dmu_bonus_hold(mos
, dsobj
, FTAG
, &dbuf
));
1295 dmu_buf_will_dirty(dbuf
, tx
);
1296 dsphys
= dbuf
->db_data
;
1297 bzero(dsphys
, sizeof (dsl_dataset_phys_t
));
1298 dsphys
->ds_dir_obj
= ds
->ds_dir
->dd_object
;
1299 dsphys
->ds_fsid_guid
= unique_create();
1300 (void) random_get_pseudo_bytes((void*)&dsphys
->ds_guid
,
1301 sizeof (dsphys
->ds_guid
));
1302 dsphys
->ds_prev_snap_obj
= dsl_dataset_phys(ds
)->ds_prev_snap_obj
;
1303 dsphys
->ds_prev_snap_txg
= dsl_dataset_phys(ds
)->ds_prev_snap_txg
;
1304 dsphys
->ds_next_snap_obj
= ds
->ds_object
;
1305 dsphys
->ds_num_children
= 1;
1306 dsphys
->ds_creation_time
= gethrestime_sec();
1307 dsphys
->ds_creation_txg
= crtxg
;
1308 dsphys
->ds_deadlist_obj
= dsl_dataset_phys(ds
)->ds_deadlist_obj
;
1309 dsphys
->ds_referenced_bytes
= dsl_dataset_phys(ds
)->ds_referenced_bytes
;
1310 dsphys
->ds_compressed_bytes
= dsl_dataset_phys(ds
)->ds_compressed_bytes
;
1311 dsphys
->ds_uncompressed_bytes
=
1312 dsl_dataset_phys(ds
)->ds_uncompressed_bytes
;
1313 dsphys
->ds_flags
= dsl_dataset_phys(ds
)->ds_flags
;
1314 dsphys
->ds_bp
= dsl_dataset_phys(ds
)->ds_bp
;
1315 dmu_buf_rele(dbuf
, FTAG
);
1317 for (spa_feature_t f
= 0; f
< SPA_FEATURES
; f
++) {
1318 if (ds
->ds_feature_inuse
[f
])
1319 dsl_dataset_activate_feature(dsobj
, f
, tx
);
1322 ASSERT3U(ds
->ds_prev
!= 0, ==,
1323 dsl_dataset_phys(ds
)->ds_prev_snap_obj
!= 0);
1325 uint64_t next_clones_obj
=
1326 dsl_dataset_phys(ds
->ds_prev
)->ds_next_clones_obj
;
1327 ASSERT(dsl_dataset_phys(ds
->ds_prev
)->ds_next_snap_obj
==
1329 dsl_dataset_phys(ds
->ds_prev
)->ds_num_children
> 1);
1330 if (dsl_dataset_phys(ds
->ds_prev
)->ds_next_snap_obj
==
1332 dmu_buf_will_dirty(ds
->ds_prev
->ds_dbuf
, tx
);
1333 ASSERT3U(dsl_dataset_phys(ds
)->ds_prev_snap_txg
, ==,
1334 dsl_dataset_phys(ds
->ds_prev
)->ds_creation_txg
);
1335 dsl_dataset_phys(ds
->ds_prev
)->ds_next_snap_obj
= dsobj
;
1336 } else if (next_clones_obj
!= 0) {
1337 dsl_dataset_remove_from_next_clones(ds
->ds_prev
,
1338 dsphys
->ds_next_snap_obj
, tx
);
1339 VERIFY0(zap_add_int(mos
,
1340 next_clones_obj
, dsobj
, tx
));
1345 * If we have a reference-reservation on this dataset, we will
1346 * need to increase the amount of refreservation being charged
1347 * since our unique space is going to zero.
1349 if (ds
->ds_reserved
) {
1351 ASSERT(DS_UNIQUE_IS_ACCURATE(ds
));
1352 delta
= MIN(dsl_dataset_phys(ds
)->ds_unique_bytes
,
1354 dsl_dir_diduse_space(ds
->ds_dir
, DD_USED_REFRSRV
,
1358 dmu_buf_will_dirty(ds
->ds_dbuf
, tx
);
1359 dsl_dataset_phys(ds
)->ds_deadlist_obj
=
1360 dsl_deadlist_clone(&ds
->ds_deadlist
, UINT64_MAX
,
1361 dsl_dataset_phys(ds
)->ds_prev_snap_obj
, tx
);
1362 dsl_deadlist_close(&ds
->ds_deadlist
);
1363 dsl_deadlist_open(&ds
->ds_deadlist
, mos
,
1364 dsl_dataset_phys(ds
)->ds_deadlist_obj
);
1365 dsl_deadlist_add_key(&ds
->ds_deadlist
,
1366 dsl_dataset_phys(ds
)->ds_prev_snap_txg
, tx
);
1368 ASSERT3U(dsl_dataset_phys(ds
)->ds_prev_snap_txg
, <, tx
->tx_txg
);
1369 dsl_dataset_phys(ds
)->ds_prev_snap_obj
= dsobj
;
1370 dsl_dataset_phys(ds
)->ds_prev_snap_txg
= crtxg
;
1371 dsl_dataset_phys(ds
)->ds_unique_bytes
= 0;
1372 if (spa_version(dp
->dp_spa
) >= SPA_VERSION_UNIQUE_ACCURATE
)
1373 dsl_dataset_phys(ds
)->ds_flags
|= DS_FLAG_UNIQUE_ACCURATE
;
1375 VERIFY0(zap_add(mos
, dsl_dataset_phys(ds
)->ds_snapnames_zapobj
,
1376 snapname
, 8, 1, &dsobj
, tx
));
1379 dsl_dataset_rele(ds
->ds_prev
, ds
);
1380 VERIFY0(dsl_dataset_hold_obj(dp
,
1381 dsl_dataset_phys(ds
)->ds_prev_snap_obj
, ds
, &ds
->ds_prev
));
1383 dsl_scan_ds_snapshotted(ds
, tx
);
1385 dsl_dir_snap_cmtime_update(ds
->ds_dir
);
1387 spa_history_log_internal_ds(ds
->ds_prev
, "snapshot", tx
, "");
1391 dsl_dataset_snapshot_sync(void *arg
, dmu_tx_t
*tx
)
1393 dsl_dataset_snapshot_arg_t
*ddsa
= arg
;
1394 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
1397 for (pair
= nvlist_next_nvpair(ddsa
->ddsa_snaps
, NULL
);
1398 pair
!= NULL
; pair
= nvlist_next_nvpair(ddsa
->ddsa_snaps
, pair
)) {
1401 char dsname
[MAXNAMELEN
];
1403 name
= nvpair_name(pair
);
1404 atp
= strchr(name
, '@');
1405 (void) strlcpy(dsname
, name
, atp
- name
+ 1);
1406 VERIFY0(dsl_dataset_hold(dp
, dsname
, FTAG
, &ds
));
1408 dsl_dataset_snapshot_sync_impl(ds
, atp
+ 1, tx
);
1409 if (ddsa
->ddsa_props
!= NULL
) {
1410 dsl_props_set_sync_impl(ds
->ds_prev
,
1411 ZPROP_SRC_LOCAL
, ddsa
->ddsa_props
, tx
);
1413 dsl_dataset_rele(ds
, FTAG
);
1418 * The snapshots must all be in the same pool.
1419 * All-or-nothing: if there are any failures, nothing will be modified.
1422 dsl_dataset_snapshot(nvlist_t
*snaps
, nvlist_t
*props
, nvlist_t
*errors
)
1424 dsl_dataset_snapshot_arg_t ddsa
;
1426 boolean_t needsuspend
;
1430 nvlist_t
*suspended
= NULL
;
1432 pair
= nvlist_next_nvpair(snaps
, NULL
);
1435 firstname
= nvpair_name(pair
);
1437 error
= spa_open(firstname
, &spa
, FTAG
);
1440 needsuspend
= (spa_version(spa
) < SPA_VERSION_FAST_SNAP
);
1441 spa_close(spa
, FTAG
);
1444 suspended
= fnvlist_alloc();
1445 for (pair
= nvlist_next_nvpair(snaps
, NULL
); pair
!= NULL
;
1446 pair
= nvlist_next_nvpair(snaps
, pair
)) {
1447 char fsname
[MAXNAMELEN
];
1448 char *snapname
= nvpair_name(pair
);
1452 atp
= strchr(snapname
, '@');
1454 error
= SET_ERROR(EINVAL
);
1457 (void) strlcpy(fsname
, snapname
, atp
- snapname
+ 1);
1459 error
= zil_suspend(fsname
, &cookie
);
1462 fnvlist_add_uint64(suspended
, fsname
,
1467 ddsa
.ddsa_snaps
= snaps
;
1468 ddsa
.ddsa_props
= props
;
1469 ddsa
.ddsa_errors
= errors
;
1470 ddsa
.ddsa_cr
= CRED();
1473 error
= dsl_sync_task(firstname
, dsl_dataset_snapshot_check
,
1474 dsl_dataset_snapshot_sync
, &ddsa
,
1475 fnvlist_num_pairs(snaps
) * 3, ZFS_SPACE_CHECK_NORMAL
);
1478 if (suspended
!= NULL
) {
1479 for (pair
= nvlist_next_nvpair(suspended
, NULL
); pair
!= NULL
;
1480 pair
= nvlist_next_nvpair(suspended
, pair
)) {
1481 zil_resume((void *)(uintptr_t)
1482 fnvpair_value_uint64(pair
));
1484 fnvlist_free(suspended
);
1490 typedef struct dsl_dataset_snapshot_tmp_arg
{
1491 const char *ddsta_fsname
;
1492 const char *ddsta_snapname
;
1493 minor_t ddsta_cleanup_minor
;
1494 const char *ddsta_htag
;
1495 } dsl_dataset_snapshot_tmp_arg_t
;
1498 dsl_dataset_snapshot_tmp_check(void *arg
, dmu_tx_t
*tx
)
1500 dsl_dataset_snapshot_tmp_arg_t
*ddsta
= arg
;
1501 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
1505 error
= dsl_dataset_hold(dp
, ddsta
->ddsta_fsname
, FTAG
, &ds
);
1509 /* NULL cred means no limit check for tmp snapshot */
1510 error
= dsl_dataset_snapshot_check_impl(ds
, ddsta
->ddsta_snapname
,
1511 tx
, B_FALSE
, 0, NULL
);
1513 dsl_dataset_rele(ds
, FTAG
);
1517 if (spa_version(dp
->dp_spa
) < SPA_VERSION_USERREFS
) {
1518 dsl_dataset_rele(ds
, FTAG
);
1519 return (SET_ERROR(ENOTSUP
));
1521 error
= dsl_dataset_user_hold_check_one(NULL
, ddsta
->ddsta_htag
,
1524 dsl_dataset_rele(ds
, FTAG
);
1528 dsl_dataset_rele(ds
, FTAG
);
1533 dsl_dataset_snapshot_tmp_sync(void *arg
, dmu_tx_t
*tx
)
1535 dsl_dataset_snapshot_tmp_arg_t
*ddsta
= arg
;
1536 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
1539 VERIFY0(dsl_dataset_hold(dp
, ddsta
->ddsta_fsname
, FTAG
, &ds
));
1541 dsl_dataset_snapshot_sync_impl(ds
, ddsta
->ddsta_snapname
, tx
);
1542 dsl_dataset_user_hold_sync_one(ds
->ds_prev
, ddsta
->ddsta_htag
,
1543 ddsta
->ddsta_cleanup_minor
, gethrestime_sec(), tx
);
1544 dsl_destroy_snapshot_sync_impl(ds
->ds_prev
, B_TRUE
, tx
);
1546 dsl_dataset_rele(ds
, FTAG
);
1550 dsl_dataset_snapshot_tmp(const char *fsname
, const char *snapname
,
1551 minor_t cleanup_minor
, const char *htag
)
1553 dsl_dataset_snapshot_tmp_arg_t ddsta
;
1556 boolean_t needsuspend
;
1559 ddsta
.ddsta_fsname
= fsname
;
1560 ddsta
.ddsta_snapname
= snapname
;
1561 ddsta
.ddsta_cleanup_minor
= cleanup_minor
;
1562 ddsta
.ddsta_htag
= htag
;
1564 error
= spa_open(fsname
, &spa
, FTAG
);
1567 needsuspend
= (spa_version(spa
) < SPA_VERSION_FAST_SNAP
);
1568 spa_close(spa
, FTAG
);
1571 error
= zil_suspend(fsname
, &cookie
);
1576 error
= dsl_sync_task(fsname
, dsl_dataset_snapshot_tmp_check
,
1577 dsl_dataset_snapshot_tmp_sync
, &ddsta
, 3, ZFS_SPACE_CHECK_RESERVED
);
1586 dsl_dataset_sync(dsl_dataset_t
*ds
, zio_t
*zio
, dmu_tx_t
*tx
)
1588 ASSERT(dmu_tx_is_syncing(tx
));
1589 ASSERT(ds
->ds_objset
!= NULL
);
1590 ASSERT(dsl_dataset_phys(ds
)->ds_next_snap_obj
== 0);
1593 * in case we had to change ds_fsid_guid when we opened it,
1596 dmu_buf_will_dirty(ds
->ds_dbuf
, tx
);
1597 dsl_dataset_phys(ds
)->ds_fsid_guid
= ds
->ds_fsid_guid
;
1599 dmu_objset_sync(ds
->ds_objset
, zio
, tx
);
1601 for (spa_feature_t f
= 0; f
< SPA_FEATURES
; f
++) {
1602 if (ds
->ds_feature_activation_needed
[f
]) {
1603 if (ds
->ds_feature_inuse
[f
])
1605 dsl_dataset_activate_feature(ds
->ds_object
, f
, tx
);
1606 ds
->ds_feature_inuse
[f
] = B_TRUE
;
1612 get_clones_stat(dsl_dataset_t
*ds
, nvlist_t
*nv
)
1615 objset_t
*mos
= ds
->ds_dir
->dd_pool
->dp_meta_objset
;
1618 nvlist_t
*propval
= fnvlist_alloc();
1619 nvlist_t
*val
= fnvlist_alloc();
1621 ASSERT(dsl_pool_config_held(ds
->ds_dir
->dd_pool
));
1624 * There may be missing entries in ds_next_clones_obj
1625 * due to a bug in a previous version of the code.
1626 * Only trust it if it has the right number of entries.
1628 if (dsl_dataset_phys(ds
)->ds_next_clones_obj
!= 0) {
1629 VERIFY0(zap_count(mos
, dsl_dataset_phys(ds
)->ds_next_clones_obj
,
1632 if (count
!= dsl_dataset_phys(ds
)->ds_num_children
- 1)
1634 for (zap_cursor_init(&zc
, mos
,
1635 dsl_dataset_phys(ds
)->ds_next_clones_obj
);
1636 zap_cursor_retrieve(&zc
, &za
) == 0;
1637 zap_cursor_advance(&zc
)) {
1638 dsl_dataset_t
*clone
;
1639 char buf
[ZFS_MAXNAMELEN
];
1640 VERIFY0(dsl_dataset_hold_obj(ds
->ds_dir
->dd_pool
,
1641 za
.za_first_integer
, FTAG
, &clone
));
1642 dsl_dir_name(clone
->ds_dir
, buf
);
1643 fnvlist_add_boolean(val
, buf
);
1644 dsl_dataset_rele(clone
, FTAG
);
1646 zap_cursor_fini(&zc
);
1647 fnvlist_add_nvlist(propval
, ZPROP_VALUE
, val
);
1648 fnvlist_add_nvlist(nv
, zfs_prop_to_name(ZFS_PROP_CLONES
), propval
);
1651 nvlist_free(propval
);
1655 dsl_dataset_stats(dsl_dataset_t
*ds
, nvlist_t
*nv
)
1657 dsl_pool_t
*dp
= ds
->ds_dir
->dd_pool
;
1658 uint64_t refd
, avail
, uobjs
, aobjs
, ratio
;
1660 ASSERT(dsl_pool_config_held(dp
));
1662 ratio
= dsl_dataset_phys(ds
)->ds_compressed_bytes
== 0 ? 100 :
1663 (dsl_dataset_phys(ds
)->ds_uncompressed_bytes
* 100 /
1664 dsl_dataset_phys(ds
)->ds_compressed_bytes
);
1666 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_REFRATIO
, ratio
);
1667 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_LOGICALREFERENCED
,
1668 dsl_dataset_phys(ds
)->ds_uncompressed_bytes
);
1670 if (ds
->ds_is_snapshot
) {
1671 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_COMPRESSRATIO
, ratio
);
1672 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_USED
,
1673 dsl_dataset_phys(ds
)->ds_unique_bytes
);
1674 get_clones_stat(ds
, nv
);
1676 if (ds
->ds_prev
!= NULL
&& ds
->ds_prev
!= dp
->dp_origin_snap
) {
1677 char buf
[MAXNAMELEN
];
1678 dsl_dataset_name(ds
->ds_prev
, buf
);
1679 dsl_prop_nvlist_add_string(nv
, ZFS_PROP_PREV_SNAP
, buf
);
1682 dsl_dir_stats(ds
->ds_dir
, nv
);
1685 dsl_dataset_space(ds
, &refd
, &avail
, &uobjs
, &aobjs
);
1686 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_AVAILABLE
, avail
);
1687 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_REFERENCED
, refd
);
1689 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_CREATION
,
1690 dsl_dataset_phys(ds
)->ds_creation_time
);
1691 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_CREATETXG
,
1692 dsl_dataset_phys(ds
)->ds_creation_txg
);
1693 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_REFQUOTA
,
1695 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_REFRESERVATION
,
1697 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_GUID
,
1698 dsl_dataset_phys(ds
)->ds_guid
);
1699 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_UNIQUE
,
1700 dsl_dataset_phys(ds
)->ds_unique_bytes
);
1701 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_OBJSETID
,
1703 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_USERREFS
,
1705 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_DEFER_DESTROY
,
1706 DS_IS_DEFER_DESTROY(ds
) ? 1 : 0);
1708 if (dsl_dataset_phys(ds
)->ds_prev_snap_obj
!= 0) {
1709 uint64_t written
, comp
, uncomp
;
1710 dsl_pool_t
*dp
= ds
->ds_dir
->dd_pool
;
1711 dsl_dataset_t
*prev
;
1713 int err
= dsl_dataset_hold_obj(dp
,
1714 dsl_dataset_phys(ds
)->ds_prev_snap_obj
, FTAG
, &prev
);
1716 err
= dsl_dataset_space_written(prev
, ds
, &written
,
1718 dsl_dataset_rele(prev
, FTAG
);
1720 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_WRITTEN
,
1728 dsl_dataset_fast_stat(dsl_dataset_t
*ds
, dmu_objset_stats_t
*stat
)
1730 dsl_pool_t
*dp
= ds
->ds_dir
->dd_pool
;
1731 ASSERT(dsl_pool_config_held(dp
));
1733 stat
->dds_creation_txg
= dsl_dataset_phys(ds
)->ds_creation_txg
;
1734 stat
->dds_inconsistent
=
1735 dsl_dataset_phys(ds
)->ds_flags
& DS_FLAG_INCONSISTENT
;
1736 stat
->dds_guid
= dsl_dataset_phys(ds
)->ds_guid
;
1737 stat
->dds_origin
[0] = '\0';
1738 if (ds
->ds_is_snapshot
) {
1739 stat
->dds_is_snapshot
= B_TRUE
;
1740 stat
->dds_num_clones
=
1741 dsl_dataset_phys(ds
)->ds_num_children
- 1;
1743 stat
->dds_is_snapshot
= B_FALSE
;
1744 stat
->dds_num_clones
= 0;
1746 if (dsl_dir_is_clone(ds
->ds_dir
)) {
1749 VERIFY0(dsl_dataset_hold_obj(dp
,
1750 dsl_dir_phys(ds
->ds_dir
)->dd_origin_obj
,
1752 dsl_dataset_name(ods
, stat
->dds_origin
);
1753 dsl_dataset_rele(ods
, FTAG
);
1759 dsl_dataset_fsid_guid(dsl_dataset_t
*ds
)
1761 return (ds
->ds_fsid_guid
);
1765 dsl_dataset_space(dsl_dataset_t
*ds
,
1766 uint64_t *refdbytesp
, uint64_t *availbytesp
,
1767 uint64_t *usedobjsp
, uint64_t *availobjsp
)
1769 *refdbytesp
= dsl_dataset_phys(ds
)->ds_referenced_bytes
;
1770 *availbytesp
= dsl_dir_space_available(ds
->ds_dir
, NULL
, 0, TRUE
);
1771 if (ds
->ds_reserved
> dsl_dataset_phys(ds
)->ds_unique_bytes
)
1773 ds
->ds_reserved
- dsl_dataset_phys(ds
)->ds_unique_bytes
;
1774 if (ds
->ds_quota
!= 0) {
1776 * Adjust available bytes according to refquota
1778 if (*refdbytesp
< ds
->ds_quota
)
1779 *availbytesp
= MIN(*availbytesp
,
1780 ds
->ds_quota
- *refdbytesp
);
1784 *usedobjsp
= BP_GET_FILL(&dsl_dataset_phys(ds
)->ds_bp
);
1785 *availobjsp
= DN_MAX_OBJECT
- *usedobjsp
;
1789 dsl_dataset_modified_since_snap(dsl_dataset_t
*ds
, dsl_dataset_t
*snap
)
1791 dsl_pool_t
*dp
= ds
->ds_dir
->dd_pool
;
1793 ASSERT(dsl_pool_config_held(dp
));
1796 if (dsl_dataset_phys(ds
)->ds_bp
.blk_birth
>
1797 dsl_dataset_phys(snap
)->ds_creation_txg
) {
1798 objset_t
*os
, *os_snap
;
1800 * It may be that only the ZIL differs, because it was
1801 * reset in the head. Don't count that as being
1804 if (dmu_objset_from_ds(ds
, &os
) != 0)
1806 if (dmu_objset_from_ds(snap
, &os_snap
) != 0)
1808 return (bcmp(&os
->os_phys
->os_meta_dnode
,
1809 &os_snap
->os_phys
->os_meta_dnode
,
1810 sizeof (os
->os_phys
->os_meta_dnode
)) != 0);
1815 typedef struct dsl_dataset_rename_snapshot_arg
{
1816 const char *ddrsa_fsname
;
1817 const char *ddrsa_oldsnapname
;
1818 const char *ddrsa_newsnapname
;
1819 boolean_t ddrsa_recursive
;
1821 } dsl_dataset_rename_snapshot_arg_t
;
1825 dsl_dataset_rename_snapshot_check_impl(dsl_pool_t
*dp
,
1826 dsl_dataset_t
*hds
, void *arg
)
1828 dsl_dataset_rename_snapshot_arg_t
*ddrsa
= arg
;
1832 error
= dsl_dataset_snap_lookup(hds
, ddrsa
->ddrsa_oldsnapname
, &val
);
1834 /* ignore nonexistent snapshots */
1835 return (error
== ENOENT
? 0 : error
);
1838 /* new name should not exist */
1839 error
= dsl_dataset_snap_lookup(hds
, ddrsa
->ddrsa_newsnapname
, &val
);
1841 error
= SET_ERROR(EEXIST
);
1842 else if (error
== ENOENT
)
1845 /* dataset name + 1 for the "@" + the new snapshot name must fit */
1846 if (dsl_dir_namelen(hds
->ds_dir
) + 1 +
1847 strlen(ddrsa
->ddrsa_newsnapname
) >= MAXNAMELEN
)
1848 error
= SET_ERROR(ENAMETOOLONG
);
1854 dsl_dataset_rename_snapshot_check(void *arg
, dmu_tx_t
*tx
)
1856 dsl_dataset_rename_snapshot_arg_t
*ddrsa
= arg
;
1857 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
1861 error
= dsl_dataset_hold(dp
, ddrsa
->ddrsa_fsname
, FTAG
, &hds
);
1865 if (ddrsa
->ddrsa_recursive
) {
1866 error
= dmu_objset_find_dp(dp
, hds
->ds_dir
->dd_object
,
1867 dsl_dataset_rename_snapshot_check_impl
, ddrsa
,
1870 error
= dsl_dataset_rename_snapshot_check_impl(dp
, hds
, ddrsa
);
1872 dsl_dataset_rele(hds
, FTAG
);
1877 dsl_dataset_rename_snapshot_sync_impl(dsl_pool_t
*dp
,
1878 dsl_dataset_t
*hds
, void *arg
)
1880 dsl_dataset_rename_snapshot_arg_t
*ddrsa
= arg
;
1883 dmu_tx_t
*tx
= ddrsa
->ddrsa_tx
;
1886 error
= dsl_dataset_snap_lookup(hds
, ddrsa
->ddrsa_oldsnapname
, &val
);
1887 ASSERT(error
== 0 || error
== ENOENT
);
1888 if (error
== ENOENT
) {
1889 /* ignore nonexistent snapshots */
1893 VERIFY0(dsl_dataset_hold_obj(dp
, val
, FTAG
, &ds
));
1895 /* log before we change the name */
1896 spa_history_log_internal_ds(ds
, "rename", tx
,
1897 "-> @%s", ddrsa
->ddrsa_newsnapname
);
1899 VERIFY0(dsl_dataset_snap_remove(hds
, ddrsa
->ddrsa_oldsnapname
, tx
,
1901 mutex_enter(&ds
->ds_lock
);
1902 (void) strcpy(ds
->ds_snapname
, ddrsa
->ddrsa_newsnapname
);
1903 mutex_exit(&ds
->ds_lock
);
1904 VERIFY0(zap_add(dp
->dp_meta_objset
,
1905 dsl_dataset_phys(hds
)->ds_snapnames_zapobj
,
1906 ds
->ds_snapname
, 8, 1, &ds
->ds_object
, tx
));
1908 dsl_dataset_rele(ds
, FTAG
);
1913 dsl_dataset_rename_snapshot_sync(void *arg
, dmu_tx_t
*tx
)
1915 dsl_dataset_rename_snapshot_arg_t
*ddrsa
= arg
;
1916 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
1919 VERIFY0(dsl_dataset_hold(dp
, ddrsa
->ddrsa_fsname
, FTAG
, &hds
));
1920 ddrsa
->ddrsa_tx
= tx
;
1921 if (ddrsa
->ddrsa_recursive
) {
1922 VERIFY0(dmu_objset_find_dp(dp
, hds
->ds_dir
->dd_object
,
1923 dsl_dataset_rename_snapshot_sync_impl
, ddrsa
,
1926 VERIFY0(dsl_dataset_rename_snapshot_sync_impl(dp
, hds
, ddrsa
));
1928 dsl_dataset_rele(hds
, FTAG
);
1932 dsl_dataset_rename_snapshot(const char *fsname
,
1933 const char *oldsnapname
, const char *newsnapname
, boolean_t recursive
)
1935 dsl_dataset_rename_snapshot_arg_t ddrsa
;
1937 ddrsa
.ddrsa_fsname
= fsname
;
1938 ddrsa
.ddrsa_oldsnapname
= oldsnapname
;
1939 ddrsa
.ddrsa_newsnapname
= newsnapname
;
1940 ddrsa
.ddrsa_recursive
= recursive
;
1942 return (dsl_sync_task(fsname
, dsl_dataset_rename_snapshot_check
,
1943 dsl_dataset_rename_snapshot_sync
, &ddrsa
,
1944 1, ZFS_SPACE_CHECK_RESERVED
));
1948 * If we're doing an ownership handoff, we need to make sure that there is
1949 * only one long hold on the dataset. We're not allowed to change anything here
1950 * so we don't permanently release the long hold or regular hold here. We want
1951 * to do this only when syncing to avoid the dataset unexpectedly going away
1952 * when we release the long hold.
1955 dsl_dataset_handoff_check(dsl_dataset_t
*ds
, void *owner
, dmu_tx_t
*tx
)
1959 if (!dmu_tx_is_syncing(tx
))
1962 if (owner
!= NULL
) {
1963 VERIFY3P(ds
->ds_owner
, ==, owner
);
1964 dsl_dataset_long_rele(ds
, owner
);
1967 held
= dsl_dataset_long_held(ds
);
1970 dsl_dataset_long_hold(ds
, owner
);
1973 return (SET_ERROR(EBUSY
));
1978 typedef struct dsl_dataset_rollback_arg
{
1979 const char *ddra_fsname
;
1981 nvlist_t
*ddra_result
;
1982 } dsl_dataset_rollback_arg_t
;
1985 dsl_dataset_rollback_check(void *arg
, dmu_tx_t
*tx
)
1987 dsl_dataset_rollback_arg_t
*ddra
= arg
;
1988 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
1990 int64_t unused_refres_delta
;
1993 error
= dsl_dataset_hold(dp
, ddra
->ddra_fsname
, FTAG
, &ds
);
1997 /* must not be a snapshot */
1998 if (ds
->ds_is_snapshot
) {
1999 dsl_dataset_rele(ds
, FTAG
);
2000 return (SET_ERROR(EINVAL
));
2003 /* must have a most recent snapshot */
2004 if (dsl_dataset_phys(ds
)->ds_prev_snap_txg
< TXG_INITIAL
) {
2005 dsl_dataset_rele(ds
, FTAG
);
2006 return (SET_ERROR(EINVAL
));
2009 /* must not have any bookmarks after the most recent snapshot */
2010 nvlist_t
*proprequest
= fnvlist_alloc();
2011 fnvlist_add_boolean(proprequest
, zfs_prop_to_name(ZFS_PROP_CREATETXG
));
2012 nvlist_t
*bookmarks
= fnvlist_alloc();
2013 error
= dsl_get_bookmarks_impl(ds
, proprequest
, bookmarks
);
2014 fnvlist_free(proprequest
);
2017 for (nvpair_t
*pair
= nvlist_next_nvpair(bookmarks
, NULL
);
2018 pair
!= NULL
; pair
= nvlist_next_nvpair(bookmarks
, pair
)) {
2020 fnvlist_lookup_nvlist(fnvpair_value_nvlist(pair
),
2021 zfs_prop_to_name(ZFS_PROP_CREATETXG
));
2022 uint64_t createtxg
= fnvlist_lookup_uint64(valuenv
, "value");
2023 if (createtxg
> dsl_dataset_phys(ds
)->ds_prev_snap_txg
) {
2024 fnvlist_free(bookmarks
);
2025 dsl_dataset_rele(ds
, FTAG
);
2026 return (SET_ERROR(EEXIST
));
2029 fnvlist_free(bookmarks
);
2031 error
= dsl_dataset_handoff_check(ds
, ddra
->ddra_owner
, tx
);
2033 dsl_dataset_rele(ds
, FTAG
);
2038 * Check if the snap we are rolling back to uses more than
2041 if (ds
->ds_quota
!= 0 &&
2042 dsl_dataset_phys(ds
->ds_prev
)->ds_referenced_bytes
> ds
->ds_quota
) {
2043 dsl_dataset_rele(ds
, FTAG
);
2044 return (SET_ERROR(EDQUOT
));
2048 * When we do the clone swap, we will temporarily use more space
2049 * due to the refreservation (the head will no longer have any
2050 * unique space, so the entire amount of the refreservation will need
2051 * to be free). We will immediately destroy the clone, freeing
2052 * this space, but the freeing happens over many txg's.
2054 unused_refres_delta
= (int64_t)MIN(ds
->ds_reserved
,
2055 dsl_dataset_phys(ds
)->ds_unique_bytes
);
2057 if (unused_refres_delta
> 0 &&
2058 unused_refres_delta
>
2059 dsl_dir_space_available(ds
->ds_dir
, NULL
, 0, TRUE
)) {
2060 dsl_dataset_rele(ds
, FTAG
);
2061 return (SET_ERROR(ENOSPC
));
2064 dsl_dataset_rele(ds
, FTAG
);
2069 dsl_dataset_rollback_sync(void *arg
, dmu_tx_t
*tx
)
2071 dsl_dataset_rollback_arg_t
*ddra
= arg
;
2072 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
2073 dsl_dataset_t
*ds
, *clone
;
2075 char namebuf
[ZFS_MAXNAMELEN
];
2077 VERIFY0(dsl_dataset_hold(dp
, ddra
->ddra_fsname
, FTAG
, &ds
));
2079 dsl_dataset_name(ds
->ds_prev
, namebuf
);
2080 fnvlist_add_string(ddra
->ddra_result
, "target", namebuf
);
2082 cloneobj
= dsl_dataset_create_sync(ds
->ds_dir
, "%rollback",
2083 ds
->ds_prev
, DS_CREATE_FLAG_NODIRTY
, kcred
, tx
);
2085 VERIFY0(dsl_dataset_hold_obj(dp
, cloneobj
, FTAG
, &clone
));
2087 dsl_dataset_clone_swap_sync_impl(clone
, ds
, tx
);
2088 dsl_dataset_zero_zil(ds
, tx
);
2090 dsl_destroy_head_sync_impl(clone
, tx
);
2092 dsl_dataset_rele(clone
, FTAG
);
2093 dsl_dataset_rele(ds
, FTAG
);
2097 * Rolls back the given filesystem or volume to the most recent snapshot.
2098 * The name of the most recent snapshot will be returned under key "target"
2099 * in the result nvlist.
2102 * - The existing dataset MUST be owned by the specified owner at entry
2103 * - Upon return, dataset will still be held by the same owner, whether we
2106 * This mode is required any time the existing filesystem is mounted. See
2107 * notes above zfs_suspend_fs() for further details.
2110 dsl_dataset_rollback(const char *fsname
, void *owner
, nvlist_t
*result
)
2112 dsl_dataset_rollback_arg_t ddra
;
2114 ddra
.ddra_fsname
= fsname
;
2115 ddra
.ddra_owner
= owner
;
2116 ddra
.ddra_result
= result
;
2118 return (dsl_sync_task(fsname
, dsl_dataset_rollback_check
,
2119 dsl_dataset_rollback_sync
, &ddra
,
2120 1, ZFS_SPACE_CHECK_RESERVED
));
2123 struct promotenode
{
2128 typedef struct dsl_dataset_promote_arg
{
2129 const char *ddpa_clonename
;
2130 dsl_dataset_t
*ddpa_clone
;
2131 list_t shared_snaps
, origin_snaps
, clone_snaps
;
2132 dsl_dataset_t
*origin_origin
; /* origin of the origin */
2133 uint64_t used
, comp
, uncomp
, unique
, cloneusedsnap
, originusedsnap
;
2136 } dsl_dataset_promote_arg_t
;
2138 static int snaplist_space(list_t
*l
, uint64_t mintxg
, uint64_t *spacep
);
2139 static int promote_hold(dsl_dataset_promote_arg_t
*ddpa
, dsl_pool_t
*dp
,
2141 static void promote_rele(dsl_dataset_promote_arg_t
*ddpa
, void *tag
);
2144 dsl_dataset_promote_check(void *arg
, dmu_tx_t
*tx
)
2146 dsl_dataset_promote_arg_t
*ddpa
= arg
;
2147 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
2149 struct promotenode
*snap
;
2150 dsl_dataset_t
*origin_ds
;
2154 size_t max_snap_len
;
2156 err
= promote_hold(ddpa
, dp
, FTAG
);
2160 hds
= ddpa
->ddpa_clone
;
2161 max_snap_len
= MAXNAMELEN
- strlen(ddpa
->ddpa_clonename
) - 1;
2163 if (dsl_dataset_phys(hds
)->ds_flags
& DS_FLAG_NOPROMOTE
) {
2164 promote_rele(ddpa
, FTAG
);
2165 return (SET_ERROR(EXDEV
));
2169 * Compute and check the amount of space to transfer. Since this is
2170 * so expensive, don't do the preliminary check.
2172 if (!dmu_tx_is_syncing(tx
)) {
2173 promote_rele(ddpa
, FTAG
);
2177 snap
= list_head(&ddpa
->shared_snaps
);
2178 origin_ds
= snap
->ds
;
2180 /* compute origin's new unique space */
2181 snap
= list_tail(&ddpa
->clone_snaps
);
2182 ASSERT3U(dsl_dataset_phys(snap
->ds
)->ds_prev_snap_obj
, ==,
2183 origin_ds
->ds_object
);
2184 dsl_deadlist_space_range(&snap
->ds
->ds_deadlist
,
2185 dsl_dataset_phys(origin_ds
)->ds_prev_snap_txg
, UINT64_MAX
,
2186 &ddpa
->unique
, &unused
, &unused
);
2189 * Walk the snapshots that we are moving
2191 * Compute space to transfer. Consider the incremental changes
2192 * to used by each snapshot:
2193 * (my used) = (prev's used) + (blocks born) - (blocks killed)
2194 * So each snapshot gave birth to:
2195 * (blocks born) = (my used) - (prev's used) + (blocks killed)
2196 * So a sequence would look like:
2197 * (uN - u(N-1) + kN) + ... + (u1 - u0 + k1) + (u0 - 0 + k0)
2198 * Which simplifies to:
2199 * uN + kN + kN-1 + ... + k1 + k0
2200 * Note however, if we stop before we reach the ORIGIN we get:
2201 * uN + kN + kN-1 + ... + kM - uM-1
2204 ddpa
->used
= dsl_dataset_phys(origin_ds
)->ds_referenced_bytes
;
2205 ddpa
->comp
= dsl_dataset_phys(origin_ds
)->ds_compressed_bytes
;
2206 ddpa
->uncomp
= dsl_dataset_phys(origin_ds
)->ds_uncompressed_bytes
;
2207 for (snap
= list_head(&ddpa
->shared_snaps
); snap
;
2208 snap
= list_next(&ddpa
->shared_snaps
, snap
)) {
2209 uint64_t val
, dlused
, dlcomp
, dluncomp
;
2210 dsl_dataset_t
*ds
= snap
->ds
;
2215 * If there are long holds, we won't be able to evict
2218 if (dsl_dataset_long_held(ds
)) {
2219 err
= SET_ERROR(EBUSY
);
2223 /* Check that the snapshot name does not conflict */
2224 VERIFY0(dsl_dataset_get_snapname(ds
));
2225 if (strlen(ds
->ds_snapname
) >= max_snap_len
) {
2226 err
= SET_ERROR(ENAMETOOLONG
);
2229 err
= dsl_dataset_snap_lookup(hds
, ds
->ds_snapname
, &val
);
2231 (void) strcpy(ddpa
->err_ds
, snap
->ds
->ds_snapname
);
2232 err
= SET_ERROR(EEXIST
);
2238 /* The very first snapshot does not have a deadlist */
2239 if (dsl_dataset_phys(ds
)->ds_prev_snap_obj
== 0)
2242 dsl_deadlist_space(&ds
->ds_deadlist
,
2243 &dlused
, &dlcomp
, &dluncomp
);
2244 ddpa
->used
+= dlused
;
2245 ddpa
->comp
+= dlcomp
;
2246 ddpa
->uncomp
+= dluncomp
;
2250 * If we are a clone of a clone then we never reached ORIGIN,
2251 * so we need to subtract out the clone origin's used space.
2253 if (ddpa
->origin_origin
) {
2255 dsl_dataset_phys(ddpa
->origin_origin
)->ds_referenced_bytes
;
2257 dsl_dataset_phys(ddpa
->origin_origin
)->ds_compressed_bytes
;
2259 dsl_dataset_phys(ddpa
->origin_origin
)->
2260 ds_uncompressed_bytes
;
2263 /* Check that there is enough space and limit headroom here */
2264 err
= dsl_dir_transfer_possible(origin_ds
->ds_dir
, hds
->ds_dir
,
2265 0, ss_mv_cnt
, ddpa
->used
, ddpa
->cr
);
2270 * Compute the amounts of space that will be used by snapshots
2271 * after the promotion (for both origin and clone). For each,
2272 * it is the amount of space that will be on all of their
2273 * deadlists (that was not born before their new origin).
2275 if (dsl_dir_phys(hds
->ds_dir
)->dd_flags
& DD_FLAG_USED_BREAKDOWN
) {
2279 * Note, typically this will not be a clone of a clone,
2280 * so dd_origin_txg will be < TXG_INITIAL, so
2281 * these snaplist_space() -> dsl_deadlist_space_range()
2282 * calls will be fast because they do not have to
2283 * iterate over all bps.
2285 snap
= list_head(&ddpa
->origin_snaps
);
2286 err
= snaplist_space(&ddpa
->shared_snaps
,
2287 snap
->ds
->ds_dir
->dd_origin_txg
, &ddpa
->cloneusedsnap
);
2291 err
= snaplist_space(&ddpa
->clone_snaps
,
2292 snap
->ds
->ds_dir
->dd_origin_txg
, &space
);
2295 ddpa
->cloneusedsnap
+= space
;
2297 if (dsl_dir_phys(origin_ds
->ds_dir
)->dd_flags
&
2298 DD_FLAG_USED_BREAKDOWN
) {
2299 err
= snaplist_space(&ddpa
->origin_snaps
,
2300 dsl_dataset_phys(origin_ds
)->ds_creation_txg
,
2301 &ddpa
->originusedsnap
);
2307 promote_rele(ddpa
, FTAG
);
2312 dsl_dataset_promote_sync(void *arg
, dmu_tx_t
*tx
)
2314 dsl_dataset_promote_arg_t
*ddpa
= arg
;
2315 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
2317 struct promotenode
*snap
;
2318 dsl_dataset_t
*origin_ds
;
2319 dsl_dataset_t
*origin_head
;
2321 dsl_dir_t
*odd
= NULL
;
2322 uint64_t oldnext_obj
;
2325 VERIFY0(promote_hold(ddpa
, dp
, FTAG
));
2326 hds
= ddpa
->ddpa_clone
;
2328 ASSERT0(dsl_dataset_phys(hds
)->ds_flags
& DS_FLAG_NOPROMOTE
);
2330 snap
= list_head(&ddpa
->shared_snaps
);
2331 origin_ds
= snap
->ds
;
2334 snap
= list_head(&ddpa
->origin_snaps
);
2335 origin_head
= snap
->ds
;
2338 * We need to explicitly open odd, since origin_ds's dd will be
2341 VERIFY0(dsl_dir_hold_obj(dp
, origin_ds
->ds_dir
->dd_object
,
2344 /* change origin's next snap */
2345 dmu_buf_will_dirty(origin_ds
->ds_dbuf
, tx
);
2346 oldnext_obj
= dsl_dataset_phys(origin_ds
)->ds_next_snap_obj
;
2347 snap
= list_tail(&ddpa
->clone_snaps
);
2348 ASSERT3U(dsl_dataset_phys(snap
->ds
)->ds_prev_snap_obj
, ==,
2349 origin_ds
->ds_object
);
2350 dsl_dataset_phys(origin_ds
)->ds_next_snap_obj
= snap
->ds
->ds_object
;
2352 /* change the origin's next clone */
2353 if (dsl_dataset_phys(origin_ds
)->ds_next_clones_obj
) {
2354 dsl_dataset_remove_from_next_clones(origin_ds
,
2355 snap
->ds
->ds_object
, tx
);
2356 VERIFY0(zap_add_int(dp
->dp_meta_objset
,
2357 dsl_dataset_phys(origin_ds
)->ds_next_clones_obj
,
2362 dmu_buf_will_dirty(dd
->dd_dbuf
, tx
);
2363 ASSERT3U(dsl_dir_phys(dd
)->dd_origin_obj
, ==, origin_ds
->ds_object
);
2364 dsl_dir_phys(dd
)->dd_origin_obj
= dsl_dir_phys(odd
)->dd_origin_obj
;
2365 dd
->dd_origin_txg
= origin_head
->ds_dir
->dd_origin_txg
;
2366 dmu_buf_will_dirty(odd
->dd_dbuf
, tx
);
2367 dsl_dir_phys(odd
)->dd_origin_obj
= origin_ds
->ds_object
;
2368 origin_head
->ds_dir
->dd_origin_txg
=
2369 dsl_dataset_phys(origin_ds
)->ds_creation_txg
;
2371 /* change dd_clone entries */
2372 if (spa_version(dp
->dp_spa
) >= SPA_VERSION_DIR_CLONES
) {
2373 VERIFY0(zap_remove_int(dp
->dp_meta_objset
,
2374 dsl_dir_phys(odd
)->dd_clones
, hds
->ds_object
, tx
));
2375 VERIFY0(zap_add_int(dp
->dp_meta_objset
,
2376 dsl_dir_phys(ddpa
->origin_origin
->ds_dir
)->dd_clones
,
2377 hds
->ds_object
, tx
));
2379 VERIFY0(zap_remove_int(dp
->dp_meta_objset
,
2380 dsl_dir_phys(ddpa
->origin_origin
->ds_dir
)->dd_clones
,
2381 origin_head
->ds_object
, tx
));
2382 if (dsl_dir_phys(dd
)->dd_clones
== 0) {
2383 dsl_dir_phys(dd
)->dd_clones
=
2384 zap_create(dp
->dp_meta_objset
, DMU_OT_DSL_CLONES
,
2385 DMU_OT_NONE
, 0, tx
);
2387 VERIFY0(zap_add_int(dp
->dp_meta_objset
,
2388 dsl_dir_phys(dd
)->dd_clones
, origin_head
->ds_object
, tx
));
2391 /* move snapshots to this dir */
2392 for (snap
= list_head(&ddpa
->shared_snaps
); snap
;
2393 snap
= list_next(&ddpa
->shared_snaps
, snap
)) {
2394 dsl_dataset_t
*ds
= snap
->ds
;
2397 * Property callbacks are registered to a particular
2398 * dsl_dir. Since ours is changing, evict the objset
2399 * so that they will be unregistered from the old dsl_dir.
2401 if (ds
->ds_objset
) {
2402 dmu_objset_evict(ds
->ds_objset
);
2403 ds
->ds_objset
= NULL
;
2406 /* move snap name entry */
2407 VERIFY0(dsl_dataset_get_snapname(ds
));
2408 VERIFY0(dsl_dataset_snap_remove(origin_head
,
2409 ds
->ds_snapname
, tx
, B_TRUE
));
2410 VERIFY0(zap_add(dp
->dp_meta_objset
,
2411 dsl_dataset_phys(hds
)->ds_snapnames_zapobj
, ds
->ds_snapname
,
2412 8, 1, &ds
->ds_object
, tx
));
2413 dsl_fs_ss_count_adjust(hds
->ds_dir
, 1,
2414 DD_FIELD_SNAPSHOT_COUNT
, tx
);
2416 /* change containing dsl_dir */
2417 dmu_buf_will_dirty(ds
->ds_dbuf
, tx
);
2418 ASSERT3U(dsl_dataset_phys(ds
)->ds_dir_obj
, ==, odd
->dd_object
);
2419 dsl_dataset_phys(ds
)->ds_dir_obj
= dd
->dd_object
;
2420 ASSERT3P(ds
->ds_dir
, ==, odd
);
2421 dsl_dir_rele(ds
->ds_dir
, ds
);
2422 VERIFY0(dsl_dir_hold_obj(dp
, dd
->dd_object
,
2423 NULL
, ds
, &ds
->ds_dir
));
2425 /* move any clone references */
2426 if (dsl_dataset_phys(ds
)->ds_next_clones_obj
&&
2427 spa_version(dp
->dp_spa
) >= SPA_VERSION_DIR_CLONES
) {
2431 for (zap_cursor_init(&zc
, dp
->dp_meta_objset
,
2432 dsl_dataset_phys(ds
)->ds_next_clones_obj
);
2433 zap_cursor_retrieve(&zc
, &za
) == 0;
2434 zap_cursor_advance(&zc
)) {
2435 dsl_dataset_t
*cnds
;
2438 if (za
.za_first_integer
== oldnext_obj
) {
2440 * We've already moved the
2441 * origin's reference.
2446 VERIFY0(dsl_dataset_hold_obj(dp
,
2447 za
.za_first_integer
, FTAG
, &cnds
));
2448 o
= dsl_dir_phys(cnds
->ds_dir
)->
2449 dd_head_dataset_obj
;
2451 VERIFY0(zap_remove_int(dp
->dp_meta_objset
,
2452 dsl_dir_phys(odd
)->dd_clones
, o
, tx
));
2453 VERIFY0(zap_add_int(dp
->dp_meta_objset
,
2454 dsl_dir_phys(dd
)->dd_clones
, o
, tx
));
2455 dsl_dataset_rele(cnds
, FTAG
);
2457 zap_cursor_fini(&zc
);
2460 ASSERT(!dsl_prop_hascb(ds
));
2464 * Change space accounting.
2465 * Note, pa->*usedsnap and dd_used_breakdown[SNAP] will either
2466 * both be valid, or both be 0 (resulting in delta == 0). This
2467 * is true for each of {clone,origin} independently.
2470 delta
= ddpa
->cloneusedsnap
-
2471 dsl_dir_phys(dd
)->dd_used_breakdown
[DD_USED_SNAP
];
2472 ASSERT3S(delta
, >=, 0);
2473 ASSERT3U(ddpa
->used
, >=, delta
);
2474 dsl_dir_diduse_space(dd
, DD_USED_SNAP
, delta
, 0, 0, tx
);
2475 dsl_dir_diduse_space(dd
, DD_USED_HEAD
,
2476 ddpa
->used
- delta
, ddpa
->comp
, ddpa
->uncomp
, tx
);
2478 delta
= ddpa
->originusedsnap
-
2479 dsl_dir_phys(odd
)->dd_used_breakdown
[DD_USED_SNAP
];
2480 ASSERT3S(delta
, <=, 0);
2481 ASSERT3U(ddpa
->used
, >=, -delta
);
2482 dsl_dir_diduse_space(odd
, DD_USED_SNAP
, delta
, 0, 0, tx
);
2483 dsl_dir_diduse_space(odd
, DD_USED_HEAD
,
2484 -ddpa
->used
- delta
, -ddpa
->comp
, -ddpa
->uncomp
, tx
);
2486 dsl_dataset_phys(origin_ds
)->ds_unique_bytes
= ddpa
->unique
;
2488 /* log history record */
2489 spa_history_log_internal_ds(hds
, "promote", tx
, "");
2491 dsl_dir_rele(odd
, FTAG
);
2492 promote_rele(ddpa
, FTAG
);
2496 * Make a list of dsl_dataset_t's for the snapshots between first_obj
2497 * (exclusive) and last_obj (inclusive). The list will be in reverse
2498 * order (last_obj will be the list_head()). If first_obj == 0, do all
2499 * snapshots back to this dataset's origin.
2502 snaplist_make(dsl_pool_t
*dp
,
2503 uint64_t first_obj
, uint64_t last_obj
, list_t
*l
, void *tag
)
2505 uint64_t obj
= last_obj
;
2507 list_create(l
, sizeof (struct promotenode
),
2508 offsetof(struct promotenode
, link
));
2510 while (obj
!= first_obj
) {
2512 struct promotenode
*snap
;
2515 err
= dsl_dataset_hold_obj(dp
, obj
, tag
, &ds
);
2516 ASSERT(err
!= ENOENT
);
2521 first_obj
= dsl_dir_phys(ds
->ds_dir
)->dd_origin_obj
;
2523 snap
= kmem_alloc(sizeof (*snap
), KM_SLEEP
);
2525 list_insert_tail(l
, snap
);
2526 obj
= dsl_dataset_phys(ds
)->ds_prev_snap_obj
;
2533 snaplist_space(list_t
*l
, uint64_t mintxg
, uint64_t *spacep
)
2535 struct promotenode
*snap
;
2538 for (snap
= list_head(l
); snap
; snap
= list_next(l
, snap
)) {
2539 uint64_t used
, comp
, uncomp
;
2540 dsl_deadlist_space_range(&snap
->ds
->ds_deadlist
,
2541 mintxg
, UINT64_MAX
, &used
, &comp
, &uncomp
);
2548 snaplist_destroy(list_t
*l
, void *tag
)
2550 struct promotenode
*snap
;
2552 if (l
== NULL
|| !list_link_active(&l
->list_head
))
2555 while ((snap
= list_tail(l
)) != NULL
) {
2556 list_remove(l
, snap
);
2557 dsl_dataset_rele(snap
->ds
, tag
);
2558 kmem_free(snap
, sizeof (*snap
));
2564 promote_hold(dsl_dataset_promote_arg_t
*ddpa
, dsl_pool_t
*dp
, void *tag
)
2568 struct promotenode
*snap
;
2570 error
= dsl_dataset_hold(dp
, ddpa
->ddpa_clonename
, tag
,
2574 dd
= ddpa
->ddpa_clone
->ds_dir
;
2576 if (ddpa
->ddpa_clone
->ds_is_snapshot
||
2577 !dsl_dir_is_clone(dd
)) {
2578 dsl_dataset_rele(ddpa
->ddpa_clone
, tag
);
2579 return (SET_ERROR(EINVAL
));
2582 error
= snaplist_make(dp
, 0, dsl_dir_phys(dd
)->dd_origin_obj
,
2583 &ddpa
->shared_snaps
, tag
);
2587 error
= snaplist_make(dp
, 0, ddpa
->ddpa_clone
->ds_object
,
2588 &ddpa
->clone_snaps
, tag
);
2592 snap
= list_head(&ddpa
->shared_snaps
);
2593 ASSERT3U(snap
->ds
->ds_object
, ==, dsl_dir_phys(dd
)->dd_origin_obj
);
2594 error
= snaplist_make(dp
, dsl_dir_phys(dd
)->dd_origin_obj
,
2595 dsl_dir_phys(snap
->ds
->ds_dir
)->dd_head_dataset_obj
,
2596 &ddpa
->origin_snaps
, tag
);
2600 if (dsl_dir_phys(snap
->ds
->ds_dir
)->dd_origin_obj
!= 0) {
2601 error
= dsl_dataset_hold_obj(dp
,
2602 dsl_dir_phys(snap
->ds
->ds_dir
)->dd_origin_obj
,
2603 tag
, &ddpa
->origin_origin
);
2609 promote_rele(ddpa
, tag
);
2614 promote_rele(dsl_dataset_promote_arg_t
*ddpa
, void *tag
)
2616 snaplist_destroy(&ddpa
->shared_snaps
, tag
);
2617 snaplist_destroy(&ddpa
->clone_snaps
, tag
);
2618 snaplist_destroy(&ddpa
->origin_snaps
, tag
);
2619 if (ddpa
->origin_origin
!= NULL
)
2620 dsl_dataset_rele(ddpa
->origin_origin
, tag
);
2621 dsl_dataset_rele(ddpa
->ddpa_clone
, tag
);
2627 * If it fails due to a conflicting snapshot name, "conflsnap" will be filled
2628 * in with the name. (It must be at least MAXNAMELEN bytes long.)
2631 dsl_dataset_promote(const char *name
, char *conflsnap
)
2633 dsl_dataset_promote_arg_t ddpa
= { 0 };
2639 * We will modify space proportional to the number of
2640 * snapshots. Compute numsnaps.
2642 error
= dmu_objset_hold(name
, FTAG
, &os
);
2645 error
= zap_count(dmu_objset_pool(os
)->dp_meta_objset
,
2646 dsl_dataset_phys(dmu_objset_ds(os
))->ds_snapnames_zapobj
,
2648 dmu_objset_rele(os
, FTAG
);
2652 ddpa
.ddpa_clonename
= name
;
2653 ddpa
.err_ds
= conflsnap
;
2656 return (dsl_sync_task(name
, dsl_dataset_promote_check
,
2657 dsl_dataset_promote_sync
, &ddpa
,
2658 2 + numsnaps
, ZFS_SPACE_CHECK_RESERVED
));
2662 dsl_dataset_clone_swap_check_impl(dsl_dataset_t
*clone
,
2663 dsl_dataset_t
*origin_head
, boolean_t force
, void *owner
, dmu_tx_t
*tx
)
2665 int64_t unused_refres_delta
;
2667 /* they should both be heads */
2668 if (clone
->ds_is_snapshot
||
2669 origin_head
->ds_is_snapshot
)
2670 return (SET_ERROR(EINVAL
));
2672 /* if we are not forcing, the branch point should be just before them */
2673 if (!force
&& clone
->ds_prev
!= origin_head
->ds_prev
)
2674 return (SET_ERROR(EINVAL
));
2676 /* clone should be the clone (unless they are unrelated) */
2677 if (clone
->ds_prev
!= NULL
&&
2678 clone
->ds_prev
!= clone
->ds_dir
->dd_pool
->dp_origin_snap
&&
2679 origin_head
->ds_dir
!= clone
->ds_prev
->ds_dir
)
2680 return (SET_ERROR(EINVAL
));
2682 /* the clone should be a child of the origin */
2683 if (clone
->ds_dir
->dd_parent
!= origin_head
->ds_dir
)
2684 return (SET_ERROR(EINVAL
));
2686 /* origin_head shouldn't be modified unless 'force' */
2688 dsl_dataset_modified_since_snap(origin_head
, origin_head
->ds_prev
))
2689 return (SET_ERROR(ETXTBSY
));
2691 /* origin_head should have no long holds (e.g. is not mounted) */
2692 if (dsl_dataset_handoff_check(origin_head
, owner
, tx
))
2693 return (SET_ERROR(EBUSY
));
2695 /* check amount of any unconsumed refreservation */
2696 unused_refres_delta
=
2697 (int64_t)MIN(origin_head
->ds_reserved
,
2698 dsl_dataset_phys(origin_head
)->ds_unique_bytes
) -
2699 (int64_t)MIN(origin_head
->ds_reserved
,
2700 dsl_dataset_phys(clone
)->ds_unique_bytes
);
2702 if (unused_refres_delta
> 0 &&
2703 unused_refres_delta
>
2704 dsl_dir_space_available(origin_head
->ds_dir
, NULL
, 0, TRUE
))
2705 return (SET_ERROR(ENOSPC
));
2707 /* clone can't be over the head's refquota */
2708 if (origin_head
->ds_quota
!= 0 &&
2709 dsl_dataset_phys(clone
)->ds_referenced_bytes
>
2710 origin_head
->ds_quota
)
2711 return (SET_ERROR(EDQUOT
));
2717 dsl_dataset_clone_swap_sync_impl(dsl_dataset_t
*clone
,
2718 dsl_dataset_t
*origin_head
, dmu_tx_t
*tx
)
2720 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
2721 int64_t unused_refres_delta
;
2723 ASSERT(clone
->ds_reserved
== 0);
2724 ASSERT(origin_head
->ds_quota
== 0 ||
2725 dsl_dataset_phys(clone
)->ds_unique_bytes
<= origin_head
->ds_quota
);
2726 ASSERT3P(clone
->ds_prev
, ==, origin_head
->ds_prev
);
2729 * Swap per-dataset feature flags.
2731 for (spa_feature_t f
= 0; f
< SPA_FEATURES
; f
++) {
2732 if (!(spa_feature_table
[f
].fi_flags
&
2733 ZFEATURE_FLAG_PER_DATASET
)) {
2734 ASSERT(!clone
->ds_feature_inuse
[f
]);
2735 ASSERT(!origin_head
->ds_feature_inuse
[f
]);
2739 boolean_t clone_inuse
= clone
->ds_feature_inuse
[f
];
2740 boolean_t origin_head_inuse
= origin_head
->ds_feature_inuse
[f
];
2743 dsl_dataset_deactivate_feature(clone
->ds_object
, f
, tx
);
2744 clone
->ds_feature_inuse
[f
] = B_FALSE
;
2746 if (origin_head_inuse
) {
2747 dsl_dataset_deactivate_feature(origin_head
->ds_object
,
2749 origin_head
->ds_feature_inuse
[f
] = B_FALSE
;
2752 dsl_dataset_activate_feature(origin_head
->ds_object
,
2754 origin_head
->ds_feature_inuse
[f
] = B_TRUE
;
2756 if (origin_head_inuse
) {
2757 dsl_dataset_activate_feature(clone
->ds_object
, f
, tx
);
2758 clone
->ds_feature_inuse
[f
] = B_TRUE
;
2762 dmu_buf_will_dirty(clone
->ds_dbuf
, tx
);
2763 dmu_buf_will_dirty(origin_head
->ds_dbuf
, tx
);
2765 if (clone
->ds_objset
!= NULL
) {
2766 dmu_objset_evict(clone
->ds_objset
);
2767 clone
->ds_objset
= NULL
;
2770 if (origin_head
->ds_objset
!= NULL
) {
2771 dmu_objset_evict(origin_head
->ds_objset
);
2772 origin_head
->ds_objset
= NULL
;
2775 unused_refres_delta
=
2776 (int64_t)MIN(origin_head
->ds_reserved
,
2777 dsl_dataset_phys(origin_head
)->ds_unique_bytes
) -
2778 (int64_t)MIN(origin_head
->ds_reserved
,
2779 dsl_dataset_phys(clone
)->ds_unique_bytes
);
2782 * Reset origin's unique bytes, if it exists.
2784 if (clone
->ds_prev
) {
2785 dsl_dataset_t
*origin
= clone
->ds_prev
;
2786 uint64_t comp
, uncomp
;
2788 dmu_buf_will_dirty(origin
->ds_dbuf
, tx
);
2789 dsl_deadlist_space_range(&clone
->ds_deadlist
,
2790 dsl_dataset_phys(origin
)->ds_prev_snap_txg
, UINT64_MAX
,
2791 &dsl_dataset_phys(origin
)->ds_unique_bytes
, &comp
, &uncomp
);
2797 tmp
= dsl_dataset_phys(origin_head
)->ds_bp
;
2798 dsl_dataset_phys(origin_head
)->ds_bp
=
2799 dsl_dataset_phys(clone
)->ds_bp
;
2800 dsl_dataset_phys(clone
)->ds_bp
= tmp
;
2803 /* set dd_*_bytes */
2805 int64_t dused
, dcomp
, duncomp
;
2806 uint64_t cdl_used
, cdl_comp
, cdl_uncomp
;
2807 uint64_t odl_used
, odl_comp
, odl_uncomp
;
2809 ASSERT3U(dsl_dir_phys(clone
->ds_dir
)->
2810 dd_used_breakdown
[DD_USED_SNAP
], ==, 0);
2812 dsl_deadlist_space(&clone
->ds_deadlist
,
2813 &cdl_used
, &cdl_comp
, &cdl_uncomp
);
2814 dsl_deadlist_space(&origin_head
->ds_deadlist
,
2815 &odl_used
, &odl_comp
, &odl_uncomp
);
2817 dused
= dsl_dataset_phys(clone
)->ds_referenced_bytes
+
2819 (dsl_dataset_phys(origin_head
)->ds_referenced_bytes
+
2821 dcomp
= dsl_dataset_phys(clone
)->ds_compressed_bytes
+
2823 (dsl_dataset_phys(origin_head
)->ds_compressed_bytes
+
2825 duncomp
= dsl_dataset_phys(clone
)->ds_uncompressed_bytes
+
2827 (dsl_dataset_phys(origin_head
)->ds_uncompressed_bytes
+
2830 dsl_dir_diduse_space(origin_head
->ds_dir
, DD_USED_HEAD
,
2831 dused
, dcomp
, duncomp
, tx
);
2832 dsl_dir_diduse_space(clone
->ds_dir
, DD_USED_HEAD
,
2833 -dused
, -dcomp
, -duncomp
, tx
);
2836 * The difference in the space used by snapshots is the
2837 * difference in snapshot space due to the head's
2838 * deadlist (since that's the only thing that's
2839 * changing that affects the snapused).
2841 dsl_deadlist_space_range(&clone
->ds_deadlist
,
2842 origin_head
->ds_dir
->dd_origin_txg
, UINT64_MAX
,
2843 &cdl_used
, &cdl_comp
, &cdl_uncomp
);
2844 dsl_deadlist_space_range(&origin_head
->ds_deadlist
,
2845 origin_head
->ds_dir
->dd_origin_txg
, UINT64_MAX
,
2846 &odl_used
, &odl_comp
, &odl_uncomp
);
2847 dsl_dir_transfer_space(origin_head
->ds_dir
, cdl_used
- odl_used
,
2848 DD_USED_HEAD
, DD_USED_SNAP
, tx
);
2851 /* swap ds_*_bytes */
2852 SWITCH64(dsl_dataset_phys(origin_head
)->ds_referenced_bytes
,
2853 dsl_dataset_phys(clone
)->ds_referenced_bytes
);
2854 SWITCH64(dsl_dataset_phys(origin_head
)->ds_compressed_bytes
,
2855 dsl_dataset_phys(clone
)->ds_compressed_bytes
);
2856 SWITCH64(dsl_dataset_phys(origin_head
)->ds_uncompressed_bytes
,
2857 dsl_dataset_phys(clone
)->ds_uncompressed_bytes
);
2858 SWITCH64(dsl_dataset_phys(origin_head
)->ds_unique_bytes
,
2859 dsl_dataset_phys(clone
)->ds_unique_bytes
);
2861 /* apply any parent delta for change in unconsumed refreservation */
2862 dsl_dir_diduse_space(origin_head
->ds_dir
, DD_USED_REFRSRV
,
2863 unused_refres_delta
, 0, 0, tx
);
2868 dsl_deadlist_close(&clone
->ds_deadlist
);
2869 dsl_deadlist_close(&origin_head
->ds_deadlist
);
2870 SWITCH64(dsl_dataset_phys(origin_head
)->ds_deadlist_obj
,
2871 dsl_dataset_phys(clone
)->ds_deadlist_obj
);
2872 dsl_deadlist_open(&clone
->ds_deadlist
, dp
->dp_meta_objset
,
2873 dsl_dataset_phys(clone
)->ds_deadlist_obj
);
2874 dsl_deadlist_open(&origin_head
->ds_deadlist
, dp
->dp_meta_objset
,
2875 dsl_dataset_phys(origin_head
)->ds_deadlist_obj
);
2877 dsl_scan_ds_clone_swapped(origin_head
, clone
, tx
);
2879 spa_history_log_internal_ds(clone
, "clone swap", tx
,
2880 "parent=%s", origin_head
->ds_dir
->dd_myname
);
2884 * Given a pool name and a dataset object number in that pool,
2885 * return the name of that dataset.
2888 dsl_dsobj_to_dsname(char *pname
, uint64_t obj
, char *buf
)
2894 error
= dsl_pool_hold(pname
, FTAG
, &dp
);
2898 error
= dsl_dataset_hold_obj(dp
, obj
, FTAG
, &ds
);
2900 dsl_dataset_name(ds
, buf
);
2901 dsl_dataset_rele(ds
, FTAG
);
2903 dsl_pool_rele(dp
, FTAG
);
2909 dsl_dataset_check_quota(dsl_dataset_t
*ds
, boolean_t check_quota
,
2910 uint64_t asize
, uint64_t inflight
, uint64_t *used
, uint64_t *ref_rsrv
)
2914 ASSERT3S(asize
, >, 0);
2917 * *ref_rsrv is the portion of asize that will come from any
2918 * unconsumed refreservation space.
2922 mutex_enter(&ds
->ds_lock
);
2924 * Make a space adjustment for reserved bytes.
2926 if (ds
->ds_reserved
> dsl_dataset_phys(ds
)->ds_unique_bytes
) {
2928 ds
->ds_reserved
- dsl_dataset_phys(ds
)->ds_unique_bytes
);
2930 (ds
->ds_reserved
- dsl_dataset_phys(ds
)->ds_unique_bytes
);
2932 asize
- MIN(asize
, parent_delta(ds
, asize
+ inflight
));
2935 if (!check_quota
|| ds
->ds_quota
== 0) {
2936 mutex_exit(&ds
->ds_lock
);
2940 * If they are requesting more space, and our current estimate
2941 * is over quota, they get to try again unless the actual
2942 * on-disk is over quota and there are no pending changes (which
2943 * may free up space for us).
2945 if (dsl_dataset_phys(ds
)->ds_referenced_bytes
+ inflight
>=
2948 dsl_dataset_phys(ds
)->ds_referenced_bytes
< ds
->ds_quota
)
2949 error
= SET_ERROR(ERESTART
);
2951 error
= SET_ERROR(EDQUOT
);
2953 mutex_exit(&ds
->ds_lock
);
2958 typedef struct dsl_dataset_set_qr_arg
{
2959 const char *ddsqra_name
;
2960 zprop_source_t ddsqra_source
;
2961 uint64_t ddsqra_value
;
2962 } dsl_dataset_set_qr_arg_t
;
2967 dsl_dataset_set_refquota_check(void *arg
, dmu_tx_t
*tx
)
2969 dsl_dataset_set_qr_arg_t
*ddsqra
= arg
;
2970 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
2975 if (spa_version(dp
->dp_spa
) < SPA_VERSION_REFQUOTA
)
2976 return (SET_ERROR(ENOTSUP
));
2978 error
= dsl_dataset_hold(dp
, ddsqra
->ddsqra_name
, FTAG
, &ds
);
2982 if (ds
->ds_is_snapshot
) {
2983 dsl_dataset_rele(ds
, FTAG
);
2984 return (SET_ERROR(EINVAL
));
2987 error
= dsl_prop_predict(ds
->ds_dir
,
2988 zfs_prop_to_name(ZFS_PROP_REFQUOTA
),
2989 ddsqra
->ddsqra_source
, ddsqra
->ddsqra_value
, &newval
);
2991 dsl_dataset_rele(ds
, FTAG
);
2996 dsl_dataset_rele(ds
, FTAG
);
3000 if (newval
< dsl_dataset_phys(ds
)->ds_referenced_bytes
||
3001 newval
< ds
->ds_reserved
) {
3002 dsl_dataset_rele(ds
, FTAG
);
3003 return (SET_ERROR(ENOSPC
));
3006 dsl_dataset_rele(ds
, FTAG
);
3011 dsl_dataset_set_refquota_sync(void *arg
, dmu_tx_t
*tx
)
3013 dsl_dataset_set_qr_arg_t
*ddsqra
= arg
;
3014 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
3018 VERIFY0(dsl_dataset_hold(dp
, ddsqra
->ddsqra_name
, FTAG
, &ds
));
3020 dsl_prop_set_sync_impl(ds
,
3021 zfs_prop_to_name(ZFS_PROP_REFQUOTA
),
3022 ddsqra
->ddsqra_source
, sizeof (ddsqra
->ddsqra_value
), 1,
3023 &ddsqra
->ddsqra_value
, tx
);
3025 VERIFY0(dsl_prop_get_int_ds(ds
,
3026 zfs_prop_to_name(ZFS_PROP_REFQUOTA
), &newval
));
3028 if (ds
->ds_quota
!= newval
) {
3029 dmu_buf_will_dirty(ds
->ds_dbuf
, tx
);
3030 ds
->ds_quota
= newval
;
3032 dsl_dataset_rele(ds
, FTAG
);
3036 dsl_dataset_set_refquota(const char *dsname
, zprop_source_t source
,
3039 dsl_dataset_set_qr_arg_t ddsqra
;
3041 ddsqra
.ddsqra_name
= dsname
;
3042 ddsqra
.ddsqra_source
= source
;
3043 ddsqra
.ddsqra_value
= refquota
;
3045 return (dsl_sync_task(dsname
, dsl_dataset_set_refquota_check
,
3046 dsl_dataset_set_refquota_sync
, &ddsqra
, 0, ZFS_SPACE_CHECK_NONE
));
3050 dsl_dataset_set_refreservation_check(void *arg
, dmu_tx_t
*tx
)
3052 dsl_dataset_set_qr_arg_t
*ddsqra
= arg
;
3053 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
3056 uint64_t newval
, unique
;
3058 if (spa_version(dp
->dp_spa
) < SPA_VERSION_REFRESERVATION
)
3059 return (SET_ERROR(ENOTSUP
));
3061 error
= dsl_dataset_hold(dp
, ddsqra
->ddsqra_name
, FTAG
, &ds
);
3065 if (ds
->ds_is_snapshot
) {
3066 dsl_dataset_rele(ds
, FTAG
);
3067 return (SET_ERROR(EINVAL
));
3070 error
= dsl_prop_predict(ds
->ds_dir
,
3071 zfs_prop_to_name(ZFS_PROP_REFRESERVATION
),
3072 ddsqra
->ddsqra_source
, ddsqra
->ddsqra_value
, &newval
);
3074 dsl_dataset_rele(ds
, FTAG
);
3079 * If we are doing the preliminary check in open context, the
3080 * space estimates may be inaccurate.
3082 if (!dmu_tx_is_syncing(tx
)) {
3083 dsl_dataset_rele(ds
, FTAG
);
3087 mutex_enter(&ds
->ds_lock
);
3088 if (!DS_UNIQUE_IS_ACCURATE(ds
))
3089 dsl_dataset_recalc_head_uniq(ds
);
3090 unique
= dsl_dataset_phys(ds
)->ds_unique_bytes
;
3091 mutex_exit(&ds
->ds_lock
);
3093 if (MAX(unique
, newval
) > MAX(unique
, ds
->ds_reserved
)) {
3094 uint64_t delta
= MAX(unique
, newval
) -
3095 MAX(unique
, ds
->ds_reserved
);
3098 dsl_dir_space_available(ds
->ds_dir
, NULL
, 0, B_TRUE
) ||
3099 (ds
->ds_quota
> 0 && newval
> ds
->ds_quota
)) {
3100 dsl_dataset_rele(ds
, FTAG
);
3101 return (SET_ERROR(ENOSPC
));
3105 dsl_dataset_rele(ds
, FTAG
);
3110 dsl_dataset_set_refreservation_sync_impl(dsl_dataset_t
*ds
,
3111 zprop_source_t source
, uint64_t value
, dmu_tx_t
*tx
)
3117 dsl_prop_set_sync_impl(ds
, zfs_prop_to_name(ZFS_PROP_REFRESERVATION
),
3118 source
, sizeof (value
), 1, &value
, tx
);
3120 VERIFY0(dsl_prop_get_int_ds(ds
,
3121 zfs_prop_to_name(ZFS_PROP_REFRESERVATION
), &newval
));
3123 dmu_buf_will_dirty(ds
->ds_dbuf
, tx
);
3124 mutex_enter(&ds
->ds_dir
->dd_lock
);
3125 mutex_enter(&ds
->ds_lock
);
3126 ASSERT(DS_UNIQUE_IS_ACCURATE(ds
));
3127 unique
= dsl_dataset_phys(ds
)->ds_unique_bytes
;
3128 delta
= MAX(0, (int64_t)(newval
- unique
)) -
3129 MAX(0, (int64_t)(ds
->ds_reserved
- unique
));
3130 ds
->ds_reserved
= newval
;
3131 mutex_exit(&ds
->ds_lock
);
3133 dsl_dir_diduse_space(ds
->ds_dir
, DD_USED_REFRSRV
, delta
, 0, 0, tx
);
3134 mutex_exit(&ds
->ds_dir
->dd_lock
);
3138 dsl_dataset_set_refreservation_sync(void *arg
, dmu_tx_t
*tx
)
3140 dsl_dataset_set_qr_arg_t
*ddsqra
= arg
;
3141 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
3144 VERIFY0(dsl_dataset_hold(dp
, ddsqra
->ddsqra_name
, FTAG
, &ds
));
3145 dsl_dataset_set_refreservation_sync_impl(ds
,
3146 ddsqra
->ddsqra_source
, ddsqra
->ddsqra_value
, tx
);
3147 dsl_dataset_rele(ds
, FTAG
);
3151 dsl_dataset_set_refreservation(const char *dsname
, zprop_source_t source
,
3152 uint64_t refreservation
)
3154 dsl_dataset_set_qr_arg_t ddsqra
;
3156 ddsqra
.ddsqra_name
= dsname
;
3157 ddsqra
.ddsqra_source
= source
;
3158 ddsqra
.ddsqra_value
= refreservation
;
3160 return (dsl_sync_task(dsname
, dsl_dataset_set_refreservation_check
,
3161 dsl_dataset_set_refreservation_sync
, &ddsqra
,
3162 0, ZFS_SPACE_CHECK_NONE
));
3166 * Return (in *usedp) the amount of space written in new that is not
3167 * present in oldsnap. New may be a snapshot or the head. Old must be
3168 * a snapshot before new, in new's filesystem (or its origin). If not then
3169 * fail and return EINVAL.
3171 * The written space is calculated by considering two components: First, we
3172 * ignore any freed space, and calculate the written as new's used space
3173 * minus old's used space. Next, we add in the amount of space that was freed
3174 * between the two snapshots, thus reducing new's used space relative to old's.
3175 * Specifically, this is the space that was born before old->ds_creation_txg,
3176 * and freed before new (ie. on new's deadlist or a previous deadlist).
3178 * space freed [---------------------]
3179 * snapshots ---O-------O--------O-------O------
3183 dsl_dataset_space_written(dsl_dataset_t
*oldsnap
, dsl_dataset_t
*new,
3184 uint64_t *usedp
, uint64_t *compp
, uint64_t *uncompp
)
3188 dsl_pool_t
*dp
= new->ds_dir
->dd_pool
;
3190 ASSERT(dsl_pool_config_held(dp
));
3193 *usedp
+= dsl_dataset_phys(new)->ds_referenced_bytes
;
3194 *usedp
-= dsl_dataset_phys(oldsnap
)->ds_referenced_bytes
;
3197 *compp
+= dsl_dataset_phys(new)->ds_compressed_bytes
;
3198 *compp
-= dsl_dataset_phys(oldsnap
)->ds_compressed_bytes
;
3201 *uncompp
+= dsl_dataset_phys(new)->ds_uncompressed_bytes
;
3202 *uncompp
-= dsl_dataset_phys(oldsnap
)->ds_uncompressed_bytes
;
3204 snapobj
= new->ds_object
;
3205 while (snapobj
!= oldsnap
->ds_object
) {
3206 dsl_dataset_t
*snap
;
3207 uint64_t used
, comp
, uncomp
;
3209 if (snapobj
== new->ds_object
) {
3212 err
= dsl_dataset_hold_obj(dp
, snapobj
, FTAG
, &snap
);
3217 if (dsl_dataset_phys(snap
)->ds_prev_snap_txg
==
3218 dsl_dataset_phys(oldsnap
)->ds_creation_txg
) {
3220 * The blocks in the deadlist can not be born after
3221 * ds_prev_snap_txg, so get the whole deadlist space,
3222 * which is more efficient (especially for old-format
3223 * deadlists). Unfortunately the deadlist code
3224 * doesn't have enough information to make this
3225 * optimization itself.
3227 dsl_deadlist_space(&snap
->ds_deadlist
,
3228 &used
, &comp
, &uncomp
);
3230 dsl_deadlist_space_range(&snap
->ds_deadlist
,
3231 0, dsl_dataset_phys(oldsnap
)->ds_creation_txg
,
3232 &used
, &comp
, &uncomp
);
3239 * If we get to the beginning of the chain of snapshots
3240 * (ds_prev_snap_obj == 0) before oldsnap, then oldsnap
3241 * was not a snapshot of/before new.
3243 snapobj
= dsl_dataset_phys(snap
)->ds_prev_snap_obj
;
3245 dsl_dataset_rele(snap
, FTAG
);
3247 err
= SET_ERROR(EINVAL
);
3256 * Return (in *usedp) the amount of space that will be reclaimed if firstsnap,
3257 * lastsnap, and all snapshots in between are deleted.
3259 * blocks that would be freed [---------------------------]
3260 * snapshots ---O-------O--------O-------O--------O
3261 * firstsnap lastsnap
3263 * This is the set of blocks that were born after the snap before firstsnap,
3264 * (birth > firstsnap->prev_snap_txg) and died before the snap after the
3265 * last snap (ie, is on lastsnap->ds_next->ds_deadlist or an earlier deadlist).
3266 * We calculate this by iterating over the relevant deadlists (from the snap
3267 * after lastsnap, backward to the snap after firstsnap), summing up the
3268 * space on the deadlist that was born after the snap before firstsnap.
3271 dsl_dataset_space_wouldfree(dsl_dataset_t
*firstsnap
,
3272 dsl_dataset_t
*lastsnap
,
3273 uint64_t *usedp
, uint64_t *compp
, uint64_t *uncompp
)
3277 dsl_pool_t
*dp
= firstsnap
->ds_dir
->dd_pool
;
3279 ASSERT(firstsnap
->ds_is_snapshot
);
3280 ASSERT(lastsnap
->ds_is_snapshot
);
3283 * Check that the snapshots are in the same dsl_dir, and firstsnap
3284 * is before lastsnap.
3286 if (firstsnap
->ds_dir
!= lastsnap
->ds_dir
||
3287 dsl_dataset_phys(firstsnap
)->ds_creation_txg
>
3288 dsl_dataset_phys(lastsnap
)->ds_creation_txg
)
3289 return (SET_ERROR(EINVAL
));
3291 *usedp
= *compp
= *uncompp
= 0;
3293 snapobj
= dsl_dataset_phys(lastsnap
)->ds_next_snap_obj
;
3294 while (snapobj
!= firstsnap
->ds_object
) {
3296 uint64_t used
, comp
, uncomp
;
3298 err
= dsl_dataset_hold_obj(dp
, snapobj
, FTAG
, &ds
);
3302 dsl_deadlist_space_range(&ds
->ds_deadlist
,
3303 dsl_dataset_phys(firstsnap
)->ds_prev_snap_txg
, UINT64_MAX
,
3304 &used
, &comp
, &uncomp
);
3309 snapobj
= dsl_dataset_phys(ds
)->ds_prev_snap_obj
;
3310 ASSERT3U(snapobj
, !=, 0);
3311 dsl_dataset_rele(ds
, FTAG
);
3317 * Return TRUE if 'earlier' is an earlier snapshot in 'later's timeline.
3318 * For example, they could both be snapshots of the same filesystem, and
3319 * 'earlier' is before 'later'. Or 'earlier' could be the origin of
3320 * 'later's filesystem. Or 'earlier' could be an older snapshot in the origin's
3321 * filesystem. Or 'earlier' could be the origin's origin.
3323 * If non-zero, earlier_txg is used instead of earlier's ds_creation_txg.
3326 dsl_dataset_is_before(dsl_dataset_t
*later
, dsl_dataset_t
*earlier
,
3327 uint64_t earlier_txg
)
3329 dsl_pool_t
*dp
= later
->ds_dir
->dd_pool
;
3333 ASSERT(dsl_pool_config_held(dp
));
3334 ASSERT(earlier
->ds_is_snapshot
|| earlier_txg
!= 0);
3336 if (earlier_txg
== 0)
3337 earlier_txg
= dsl_dataset_phys(earlier
)->ds_creation_txg
;
3339 if (later
->ds_is_snapshot
&&
3340 earlier_txg
>= dsl_dataset_phys(later
)->ds_creation_txg
)
3343 if (later
->ds_dir
== earlier
->ds_dir
)
3345 if (!dsl_dir_is_clone(later
->ds_dir
))
3348 if (dsl_dir_phys(later
->ds_dir
)->dd_origin_obj
== earlier
->ds_object
)
3350 dsl_dataset_t
*origin
;
3351 error
= dsl_dataset_hold_obj(dp
,
3352 dsl_dir_phys(later
->ds_dir
)->dd_origin_obj
, FTAG
, &origin
);
3355 ret
= dsl_dataset_is_before(origin
, earlier
, earlier_txg
);
3356 dsl_dataset_rele(origin
, FTAG
);
3361 dsl_dataset_zapify(dsl_dataset_t
*ds
, dmu_tx_t
*tx
)
3363 objset_t
*mos
= ds
->ds_dir
->dd_pool
->dp_meta_objset
;
3364 dmu_object_zapify(mos
, ds
->ds_object
, DMU_OT_DSL_DATASET
, tx
);