1/*
2 * CDDL HEADER START
3 *
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.
7 *
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.
12 *
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]
18 *
19 * CDDL HEADER END
20 */
21/*
22 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
23 * Portions Copyright (c) 2011 Martin Matuska <mm@FreeBSD.org>
24 * Copyright (c) 2013, 2014 by Delphix. All rights reserved.
25 * Copyright (c) 2014, Joyent, Inc. All rights reserved.
26 * Copyright (c) 2014 RackTop Systems.
27 */
28
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>
37#include <sys/arc.h>
38#include <sys/zio.h>
39#include <sys/zap.h>
40#include <sys/zfeature.h>
41#include <sys/unique.h>
42#include <sys/zfs_context.h>
43#include <sys/zfs_ioctl.h>
44#include <sys/spa.h>
45#include <sys/zfs_znode.h>
46#include <sys/zfs_onexit.h>
47#include <sys/zvol.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
54#define SWITCH64(x, y) \
55 { \
56 uint64_t __tmp = (x); \
57 (x) = (y); \
58 (y) = __tmp; \
59 }
60
61#define DS_REF_MAX (1ULL << 62)
62
63#define DSL_DEADLIST_BLOCKSIZE SPA_MAXBLOCKSIZE
64
65/*
66 * Figure out how much of this delta should be propogated to the dsl_dir
67 * layer. If there's a refreservation, that space has already been
68 * partially accounted for in our ancestors.
69 */
70static int64_t
71parent_delta(dsl_dataset_t *ds, int64_t delta)
72{
73 uint64_t old_bytes, new_bytes;
74
75 if (ds->ds_reserved == 0)
76 return (delta);
77
78 old_bytes = MAX(ds->ds_phys->ds_unique_bytes, ds->ds_reserved);
79 new_bytes = MAX(ds->ds_phys->ds_unique_bytes + delta, ds->ds_reserved);
80
81 ASSERT3U(ABS((int64_t)(new_bytes - old_bytes)), <=, ABS(delta));
82 return (new_bytes - old_bytes);
83}
84
85void
86dsl_dataset_block_born(dsl_dataset_t *ds, const blkptr_t *bp, dmu_tx_t *tx)
87{
88 int used = bp_get_dsize_sync(tx->tx_pool->dp_spa, bp);
89 int compressed = BP_GET_PSIZE(bp);
90 int uncompressed = BP_GET_UCSIZE(bp);
91 int64_t delta;
92
93 dprintf_bp(bp, "ds=%p", ds);
94
95 ASSERT(dmu_tx_is_syncing(tx));
96 /* It could have been compressed away to nothing */
97 if (BP_IS_HOLE(bp))
98 return;
99 ASSERT(BP_GET_TYPE(bp) != DMU_OT_NONE);
100 ASSERT(DMU_OT_IS_VALID(BP_GET_TYPE(bp)));
101 if (ds == NULL) {
102 dsl_pool_mos_diduse_space(tx->tx_pool,
103 used, compressed, uncompressed);
104 return;
105 }
106
107 dmu_buf_will_dirty(ds->ds_dbuf, tx);
108 mutex_enter(&ds->ds_lock);
109 delta = parent_delta(ds, used);
110 ds->ds_phys->ds_referenced_bytes += used;
111 ds->ds_phys->ds_compressed_bytes += compressed;
112 ds->ds_phys->ds_uncompressed_bytes += uncompressed;
113 ds->ds_phys->ds_unique_bytes += used;
114 mutex_exit(&ds->ds_lock);
115 dsl_dir_diduse_space(ds->ds_dir, DD_USED_HEAD, delta,
116 compressed, uncompressed, tx);
117 dsl_dir_transfer_space(ds->ds_dir, used - delta,
118 DD_USED_REFRSRV, DD_USED_HEAD, tx);
119}
120
121int
122dsl_dataset_block_kill(dsl_dataset_t *ds, const blkptr_t *bp, dmu_tx_t *tx,
123 boolean_t async)
124{
125 int used = bp_get_dsize_sync(tx->tx_pool->dp_spa, bp);
126 int compressed = BP_GET_PSIZE(bp);
127 int uncompressed = BP_GET_UCSIZE(bp);
128
129 if (BP_IS_HOLE(bp))
130 return (0);
131
132 ASSERT(dmu_tx_is_syncing(tx));
133 ASSERT(bp->blk_birth <= tx->tx_txg);
134
135 if (ds == NULL) {
136 dsl_free(tx->tx_pool, tx->tx_txg, bp);
137 dsl_pool_mos_diduse_space(tx->tx_pool,
138 -used, -compressed, -uncompressed);
139 return (used);
140 }
141 ASSERT3P(tx->tx_pool, ==, ds->ds_dir->dd_pool);
142
143 ASSERT(!dsl_dataset_is_snapshot(ds));
144 dmu_buf_will_dirty(ds->ds_dbuf, tx);
145
146 if (bp->blk_birth > ds->ds_phys->ds_prev_snap_txg) {
147 int64_t delta;
148
149 dprintf_bp(bp, "freeing ds=%llu", ds->ds_object);
150 dsl_free(tx->tx_pool, tx->tx_txg, bp);
151
152 mutex_enter(&ds->ds_lock);
153 ASSERT(ds->ds_phys->ds_unique_bytes >= used ||
154 !DS_UNIQUE_IS_ACCURATE(ds));
155 delta = parent_delta(ds, -used);
156 ds->ds_phys->ds_unique_bytes -= used;
157 mutex_exit(&ds->ds_lock);
158 dsl_dir_diduse_space(ds->ds_dir, DD_USED_HEAD,
159 delta, -compressed, -uncompressed, tx);
160 dsl_dir_transfer_space(ds->ds_dir, -used - delta,
161 DD_USED_REFRSRV, DD_USED_HEAD, tx);
162 } else {
163 dprintf_bp(bp, "putting on dead list: %s", "");
164 if (async) {
165 /*
166 * We are here as part of zio's write done callback,
167 * which means we're a zio interrupt thread. We can't
168 * call dsl_deadlist_insert() now because it may block
169 * waiting for I/O. Instead, put bp on the deferred
170 * queue and let dsl_pool_sync() finish the job.
171 */
172 bplist_append(&ds->ds_pending_deadlist, bp);
173 } else {
174 dsl_deadlist_insert(&ds->ds_deadlist, bp, tx);
175 }
176 ASSERT3U(ds->ds_prev->ds_object, ==,
177 ds->ds_phys->ds_prev_snap_obj);
178 ASSERT(ds->ds_prev->ds_phys->ds_num_children > 0);
179 /* if (bp->blk_birth > prev prev snap txg) prev unique += bs */
180 if (ds->ds_prev->ds_phys->ds_next_snap_obj ==
181 ds->ds_object && bp->blk_birth >
182 ds->ds_prev->ds_phys->ds_prev_snap_txg) {
183 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx);
184 mutex_enter(&ds->ds_prev->ds_lock);
185 ds->ds_prev->ds_phys->ds_unique_bytes += used;
186 mutex_exit(&ds->ds_prev->ds_lock);
187 }
188 if (bp->blk_birth > ds->ds_dir->dd_origin_txg) {
189 dsl_dir_transfer_space(ds->ds_dir, used,
190 DD_USED_HEAD, DD_USED_SNAP, tx);
191 }
192 }
193 mutex_enter(&ds->ds_lock);
194 ASSERT3U(ds->ds_phys->ds_referenced_bytes, >=, used);
195 ds->ds_phys->ds_referenced_bytes -= used;
196 ASSERT3U(ds->ds_phys->ds_compressed_bytes, >=, compressed);
197 ds->ds_phys->ds_compressed_bytes -= compressed;
198 ASSERT3U(ds->ds_phys->ds_uncompressed_bytes, >=, uncompressed);
199 ds->ds_phys->ds_uncompressed_bytes -= uncompressed;
200 mutex_exit(&ds->ds_lock);
201
202 return (used);
203}
204
205uint64_t
206dsl_dataset_prev_snap_txg(dsl_dataset_t *ds)
207{
208 uint64_t trysnap = 0;
209
210 if (ds == NULL)
211 return (0);
212 /*
213 * The snapshot creation could fail, but that would cause an
214 * incorrect FALSE return, which would only result in an
215 * overestimation of the amount of space that an operation would
216 * consume, which is OK.
217 *
218 * There's also a small window where we could miss a pending
219 * snapshot, because we could set the sync task in the quiescing
220 * phase. So this should only be used as a guess.
221 */
222 if (ds->ds_trysnap_txg >
223 spa_last_synced_txg(ds->ds_dir->dd_pool->dp_spa))
224 trysnap = ds->ds_trysnap_txg;
225 return (MAX(ds->ds_phys->ds_prev_snap_txg, trysnap));
226}
227
228boolean_t
229dsl_dataset_block_freeable(dsl_dataset_t *ds, const blkptr_t *bp,
230 uint64_t blk_birth)
231{
232 if (blk_birth <= dsl_dataset_prev_snap_txg(ds) ||
233 (bp != NULL && BP_IS_HOLE(bp)))
234 return (B_FALSE);
235
236 ddt_prefetch(dsl_dataset_get_spa(ds), bp);
237
238 return (B_TRUE);
239}
240
241/* ARGSUSED */
242static void
243dsl_dataset_evict(dmu_buf_t *db, void *dsv)
244{
245 dsl_dataset_t *ds = dsv;
246
247 ASSERT(ds->ds_owner == NULL);
248
249 unique_remove(ds->ds_fsid_guid);
250
251 if (ds->ds_objset != NULL)
252 dmu_objset_evict(ds->ds_objset);
253
254 if (ds->ds_prev) {
255 dsl_dataset_rele(ds->ds_prev, ds);
256 ds->ds_prev = NULL;
257 }
258
259 bplist_destroy(&ds->ds_pending_deadlist);
260 if (ds->ds_phys->ds_deadlist_obj != 0)
261 dsl_deadlist_close(&ds->ds_deadlist);
262 if (ds->ds_dir)
263 dsl_dir_rele(ds->ds_dir, ds);
264
265 ASSERT(!list_link_active(&ds->ds_synced_link));
266
267 if (mutex_owned(&ds->ds_lock))
268 mutex_exit(&ds->ds_lock);
269 mutex_destroy(&ds->ds_lock);
270 if (mutex_owned(&ds->ds_opening_lock))
271 mutex_exit(&ds->ds_opening_lock);
272 mutex_destroy(&ds->ds_opening_lock);
273 refcount_destroy(&ds->ds_longholds);
274
275 kmem_free(ds, sizeof (dsl_dataset_t));
276}
277
278int
279dsl_dataset_get_snapname(dsl_dataset_t *ds)
280{
281 dsl_dataset_phys_t *headphys;
282 int err;
283 dmu_buf_t *headdbuf;
284 dsl_pool_t *dp = ds->ds_dir->dd_pool;
285 objset_t *mos = dp->dp_meta_objset;
286
287 if (ds->ds_snapname[0])
288 return (0);
289 if (ds->ds_phys->ds_next_snap_obj == 0)
290 return (0);
291
292 err = dmu_bonus_hold(mos, ds->ds_dir->dd_phys->dd_head_dataset_obj,
293 FTAG, &headdbuf);
294 if (err != 0)
295 return (err);
296 headphys = headdbuf->db_data;
297 err = zap_value_search(dp->dp_meta_objset,
298 headphys->ds_snapnames_zapobj, ds->ds_object, 0, ds->ds_snapname);
299 dmu_buf_rele(headdbuf, FTAG);
300 return (err);
301}
302
303int
304dsl_dataset_snap_lookup(dsl_dataset_t *ds, const char *name, uint64_t *value)
305{
306 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
307 uint64_t snapobj = ds->ds_phys->ds_snapnames_zapobj;
308 matchtype_t mt;
309 int err;
310
311 if (ds->ds_phys->ds_flags & DS_FLAG_CI_DATASET)
312 mt = MT_FIRST;
313 else
314 mt = MT_EXACT;
315
316 err = zap_lookup_norm(mos, snapobj, name, 8, 1,
317 value, mt, NULL, 0, NULL);
318 if (err == ENOTSUP && mt == MT_FIRST)
319 err = zap_lookup(mos, snapobj, name, 8, 1, value);
320 return (err);
321}
322
323int
324dsl_dataset_snap_remove(dsl_dataset_t *ds, const char *name, dmu_tx_t *tx,
325 boolean_t adj_cnt)
326{
327 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
328 uint64_t snapobj = ds->ds_phys->ds_snapnames_zapobj;
329 matchtype_t mt;
330 int err;
331
332 dsl_dir_snap_cmtime_update(ds->ds_dir);
333
334 if (ds->ds_phys->ds_flags & DS_FLAG_CI_DATASET)
335 mt = MT_FIRST;
336 else
337 mt = MT_EXACT;
338
339 err = zap_remove_norm(mos, snapobj, name, mt, tx);
340 if (err == ENOTSUP && mt == MT_FIRST)
341 err = zap_remove(mos, snapobj, name, tx);
342
343 if (err == 0 && adj_cnt)
344 dsl_fs_ss_count_adjust(ds->ds_dir, -1,
345 DD_FIELD_SNAPSHOT_COUNT, tx);
346
347 return (err);
348}
349
350int
351dsl_dataset_hold_obj(dsl_pool_t *dp, uint64_t dsobj, void *tag,
352 dsl_dataset_t **dsp)
353{
354 objset_t *mos = dp->dp_meta_objset;
355 dmu_buf_t *dbuf;
356 dsl_dataset_t *ds;
357 int err;
358 dmu_object_info_t doi;
359
360 ASSERT(dsl_pool_config_held(dp));
361
362 err = dmu_bonus_hold(mos, dsobj, tag, &dbuf);
363 if (err != 0)
364 return (err);
365
366 /* Make sure dsobj has the correct object type. */
367 dmu_object_info_from_db(dbuf, &doi);
368 if (doi.doi_bonus_type != DMU_OT_DSL_DATASET) {
369 dmu_buf_rele(dbuf, tag);
370 return (SET_ERROR(EINVAL));
371 }
372
373 ds = dmu_buf_get_user(dbuf);
374 if (ds == NULL) {
375 dsl_dataset_t *winner = NULL;
376
377 ds = kmem_zalloc(sizeof (dsl_dataset_t), KM_SLEEP);
378 ds->ds_dbuf = dbuf;
379 ds->ds_object = dsobj;
380 ds->ds_phys = dbuf->db_data;
381
382 mutex_init(&ds->ds_lock, NULL, MUTEX_DEFAULT, NULL);
383 mutex_init(&ds->ds_opening_lock, NULL, MUTEX_DEFAULT, NULL);
384 mutex_init(&ds->ds_sendstream_lock, NULL, MUTEX_DEFAULT, NULL);
385 refcount_create(&ds->ds_longholds);
386
387 bplist_create(&ds->ds_pending_deadlist);
388 dsl_deadlist_open(&ds->ds_deadlist,
389 mos, ds->ds_phys->ds_deadlist_obj);
390
391 list_create(&ds->ds_sendstreams, sizeof (dmu_sendarg_t),
392 offsetof(dmu_sendarg_t, dsa_link));
393
394 if (err == 0) {
395 err = dsl_dir_hold_obj(dp,
396 ds->ds_phys->ds_dir_obj, NULL, ds, &ds->ds_dir);
397 }
398 if (err != 0) {
399 mutex_destroy(&ds->ds_lock);
400 mutex_destroy(&ds->ds_opening_lock);
401 refcount_destroy(&ds->ds_longholds);
402 bplist_destroy(&ds->ds_pending_deadlist);
403 dsl_deadlist_close(&ds->ds_deadlist);
404 kmem_free(ds, sizeof (dsl_dataset_t));
405 dmu_buf_rele(dbuf, tag);
406 return (err);
407 }
408
409 if (!dsl_dataset_is_snapshot(ds)) {
410 ds->ds_snapname[0] = '\0';
411 if (ds->ds_phys->ds_prev_snap_obj != 0) {
412 err = dsl_dataset_hold_obj(dp,
413 ds->ds_phys->ds_prev_snap_obj,
414 ds, &ds->ds_prev);
415 }
416 if (doi.doi_type == DMU_OTN_ZAP_METADATA) {
417 int zaperr = zap_lookup(mos, ds->ds_object,
418 DS_FIELD_BOOKMARK_NAMES,
419 sizeof (ds->ds_bookmarks), 1,
420 &ds->ds_bookmarks);
421 if (zaperr != ENOENT)
422 VERIFY0(zaperr);
423 }
424 } else {
425 if (zfs_flags & ZFS_DEBUG_SNAPNAMES)
426 err = dsl_dataset_get_snapname(ds);
427 if (err == 0 && ds->ds_phys->ds_userrefs_obj != 0) {
428 err = zap_count(
429 ds->ds_dir->dd_pool->dp_meta_objset,
430 ds->ds_phys->ds_userrefs_obj,
431 &ds->ds_userrefs);
432 }
433 }
434
435 if (err == 0 && !dsl_dataset_is_snapshot(ds)) {
436 err = dsl_prop_get_int_ds(ds,
437 zfs_prop_to_name(ZFS_PROP_REFRESERVATION),
438 &ds->ds_reserved);
439 if (err == 0) {
440 err = dsl_prop_get_int_ds(ds,
441 zfs_prop_to_name(ZFS_PROP_REFQUOTA),
442 &ds->ds_quota);
443 }
444 } else {
445 ds->ds_reserved = ds->ds_quota = 0;
446 }
447
448 if (err != 0 || (winner = dmu_buf_set_user_ie(dbuf, ds,
449 &ds->ds_phys, dsl_dataset_evict)) != NULL) {
450 bplist_destroy(&ds->ds_pending_deadlist);
451 dsl_deadlist_close(&ds->ds_deadlist);
452 if (ds->ds_prev)
453 dsl_dataset_rele(ds->ds_prev, ds);
454 dsl_dir_rele(ds->ds_dir, ds);
455 mutex_destroy(&ds->ds_lock);
456 mutex_destroy(&ds->ds_opening_lock);
457 refcount_destroy(&ds->ds_longholds);
458 kmem_free(ds, sizeof (dsl_dataset_t));
459 if (err != 0) {
460 dmu_buf_rele(dbuf, tag);
461 return (err);
462 }
463 ds = winner;
464 } else {
465 ds->ds_fsid_guid =
466 unique_insert(ds->ds_phys->ds_fsid_guid);
467 }
468 }
469 ASSERT3P(ds->ds_dbuf, ==, dbuf);
470 ASSERT3P(ds->ds_phys, ==, dbuf->db_data);
471 ASSERT(ds->ds_phys->ds_prev_snap_obj != 0 ||
472 spa_version(dp->dp_spa) < SPA_VERSION_ORIGIN ||
473 dp->dp_origin_snap == NULL || ds == dp->dp_origin_snap);
474 *dsp = ds;
475 return (0);
476}
477
478int
479dsl_dataset_hold(dsl_pool_t *dp, const char *name,
480 void *tag, dsl_dataset_t **dsp)
481{
482 dsl_dir_t *dd;
483 const char *snapname;
484 uint64_t obj;
485 int err = 0;
486
487 err = dsl_dir_hold(dp, name, FTAG, &dd, &snapname);
488 if (err != 0)
489 return (err);
490
491 ASSERT(dsl_pool_config_held(dp));
492 obj = dd->dd_phys->dd_head_dataset_obj;
493 if (obj != 0)
494 err = dsl_dataset_hold_obj(dp, obj, tag, dsp);
495 else
496 err = SET_ERROR(ENOENT);
497
498 /* we may be looking for a snapshot */
499 if (err == 0 && snapname != NULL) {
500 dsl_dataset_t *ds;
501
502 if (*snapname++ != '@') {
503 dsl_dataset_rele(*dsp, tag);
504 dsl_dir_rele(dd, FTAG);
505 return (SET_ERROR(ENOENT));
506 }
507
508 dprintf("looking for snapshot '%s'\n", snapname);
509 err = dsl_dataset_snap_lookup(*dsp, snapname, &obj);
510 if (err == 0)
511 err = dsl_dataset_hold_obj(dp, obj, tag, &ds);
512 dsl_dataset_rele(*dsp, tag);
513
514 if (err == 0) {
515 mutex_enter(&ds->ds_lock);
516 if (ds->ds_snapname[0] == 0)
517 (void) strlcpy(ds->ds_snapname, snapname,
518 sizeof (ds->ds_snapname));
519 mutex_exit(&ds->ds_lock);
520 *dsp = ds;
521 }
522 }
523
524 dsl_dir_rele(dd, FTAG);
525 return (err);
526}
527
528int
529dsl_dataset_own_obj(dsl_pool_t *dp, uint64_t dsobj,
530 void *tag, dsl_dataset_t **dsp)
531{
532 int err = dsl_dataset_hold_obj(dp, dsobj, tag, dsp);
533 if (err != 0)
534 return (err);
535 if (!dsl_dataset_tryown(*dsp, tag)) {
536 dsl_dataset_rele(*dsp, tag);
537 *dsp = NULL;
538 return (SET_ERROR(EBUSY));
539 }
540 return (0);
541}
542
543int
544dsl_dataset_own(dsl_pool_t *dp, const char *name,
545 void *tag, dsl_dataset_t **dsp)
546{
547 int err = dsl_dataset_hold(dp, name, tag, dsp);
548 if (err != 0)
549 return (err);
550 if (!dsl_dataset_tryown(*dsp, tag)) {
551 dsl_dataset_rele(*dsp, tag);
552 return (SET_ERROR(EBUSY));
553 }
554 return (0);
555}
556
557/*
558 * See the comment above dsl_pool_hold() for details. In summary, a long
559 * hold is used to prevent destruction of a dataset while the pool hold
560 * is dropped, allowing other concurrent operations (e.g. spa_sync()).
561 *
562 * The dataset and pool must be held when this function is called. After it
563 * is called, the pool hold may be released while the dataset is still held
564 * and accessed.
565 */
566void
567dsl_dataset_long_hold(dsl_dataset_t *ds, void *tag)
568{
569 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool));
570 (void) refcount_add(&ds->ds_longholds, tag);
571}
572
573void
574dsl_dataset_long_rele(dsl_dataset_t *ds, void *tag)
575{
576 (void) refcount_remove(&ds->ds_longholds, tag);
577}
578
579/* Return B_TRUE if there are any long holds on this dataset. */
580boolean_t
581dsl_dataset_long_held(dsl_dataset_t *ds)
582{
583 return (!refcount_is_zero(&ds->ds_longholds));
584}
585
586void
587dsl_dataset_name(dsl_dataset_t *ds, char *name)
588{
589 if (ds == NULL) {
590 (void) strcpy(name, "mos");
591 } else {
592 dsl_dir_name(ds->ds_dir, name);
593 VERIFY0(dsl_dataset_get_snapname(ds));
594 if (ds->ds_snapname[0]) {
595 (void) strcat(name, "@");
596 /*
597 * We use a "recursive" mutex so that we
598 * can call dprintf_ds() with ds_lock held.
599 */
600 if (!MUTEX_HELD(&ds->ds_lock)) {
601 mutex_enter(&ds->ds_lock);
602 (void) strcat(name, ds->ds_snapname);
603 mutex_exit(&ds->ds_lock);
604 } else {
605 (void) strcat(name, ds->ds_snapname);
606 }
607 }
608 }
609}
610
611void
612dsl_dataset_rele(dsl_dataset_t *ds, void *tag)
613{
614 dmu_buf_rele(ds->ds_dbuf, tag);
615}
616
617void
618dsl_dataset_disown(dsl_dataset_t *ds, void *tag)
619{
620 ASSERT(ds->ds_owner == tag && ds->ds_dbuf != NULL);
621
622 mutex_enter(&ds->ds_lock);
623 ds->ds_owner = NULL;
624 mutex_exit(&ds->ds_lock);
625 dsl_dataset_long_rele(ds, tag);
626 if (ds->ds_dbuf != NULL)
627 dsl_dataset_rele(ds, tag);
628 else
629 dsl_dataset_evict(NULL, ds);
630}
631
632boolean_t
633dsl_dataset_tryown(dsl_dataset_t *ds, void *tag)
634{
635 boolean_t gotit = FALSE;
636
637 mutex_enter(&ds->ds_lock);
638 if (ds->ds_owner == NULL && !DS_IS_INCONSISTENT(ds)) {
639 ds->ds_owner = tag;
640 dsl_dataset_long_hold(ds, tag);
641 gotit = TRUE;
642 }
643 mutex_exit(&ds->ds_lock);
644 return (gotit);
645}
646
647uint64_t
648dsl_dataset_create_sync_dd(dsl_dir_t *dd, dsl_dataset_t *origin,
649 uint64_t flags, dmu_tx_t *tx)
650{
651 dsl_pool_t *dp = dd->dd_pool;
652 dmu_buf_t *dbuf;
653 dsl_dataset_phys_t *dsphys;
654 uint64_t dsobj;
655 objset_t *mos = dp->dp_meta_objset;
656
657 if (origin == NULL)
658 origin = dp->dp_origin_snap;
659
660 ASSERT(origin == NULL || origin->ds_dir->dd_pool == dp);
661 ASSERT(origin == NULL || origin->ds_phys->ds_num_children > 0);
662 ASSERT(dmu_tx_is_syncing(tx));
663 ASSERT(dd->dd_phys->dd_head_dataset_obj == 0);
664
665 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0,
666 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx);
667 VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf));
668 dmu_buf_will_dirty(dbuf, tx);
669 dsphys = dbuf->db_data;
670 bzero(dsphys, sizeof (dsl_dataset_phys_t));
671 dsphys->ds_dir_obj = dd->dd_object;
672 dsphys->ds_flags = flags;
673 dsphys->ds_fsid_guid = unique_create();
674 do {
675 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid,
676 sizeof (dsphys->ds_guid));
677 } while (dsphys->ds_guid == 0);
678 dsphys->ds_snapnames_zapobj =
679 zap_create_norm(mos, U8_TEXTPREP_TOUPPER, DMU_OT_DSL_DS_SNAP_MAP,
680 DMU_OT_NONE, 0, tx);
681 dsphys->ds_creation_time = gethrestime_sec();
682 dsphys->ds_creation_txg = tx->tx_txg == TXG_INITIAL ? 1 : tx->tx_txg;
683
684 if (origin == NULL) {
685 dsphys->ds_deadlist_obj = dsl_deadlist_alloc(mos, tx);
686 } else {
687 dsl_dataset_t *ohds; /* head of the origin snapshot */
688
689 dsphys->ds_prev_snap_obj = origin->ds_object;
690 dsphys->ds_prev_snap_txg =
691 origin->ds_phys->ds_creation_txg;
692 dsphys->ds_referenced_bytes =
693 origin->ds_phys->ds_referenced_bytes;
694 dsphys->ds_compressed_bytes =
695 origin->ds_phys->ds_compressed_bytes;
696 dsphys->ds_uncompressed_bytes =
697 origin->ds_phys->ds_uncompressed_bytes;
698 dsphys->ds_bp = origin->ds_phys->ds_bp;
699 dsphys->ds_flags |= origin->ds_phys->ds_flags;
700
701 dmu_buf_will_dirty(origin->ds_dbuf, tx);
702 origin->ds_phys->ds_num_children++;
703
704 VERIFY0(dsl_dataset_hold_obj(dp,
705 origin->ds_dir->dd_phys->dd_head_dataset_obj, FTAG, &ohds));
706 dsphys->ds_deadlist_obj = dsl_deadlist_clone(&ohds->ds_deadlist,
707 dsphys->ds_prev_snap_txg, dsphys->ds_prev_snap_obj, tx);
708 dsl_dataset_rele(ohds, FTAG);
709
710 if (spa_version(dp->dp_spa) >= SPA_VERSION_NEXT_CLONES) {
711 if (origin->ds_phys->ds_next_clones_obj == 0) {
712 origin->ds_phys->ds_next_clones_obj =
713 zap_create(mos,
714 DMU_OT_NEXT_CLONES, DMU_OT_NONE, 0, tx);
715 }
716 VERIFY0(zap_add_int(mos,
717 origin->ds_phys->ds_next_clones_obj, dsobj, tx));
718 }
719
720 dmu_buf_will_dirty(dd->dd_dbuf, tx);
721 dd->dd_phys->dd_origin_obj = origin->ds_object;
722 if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) {
723 if (origin->ds_dir->dd_phys->dd_clones == 0) {
724 dmu_buf_will_dirty(origin->ds_dir->dd_dbuf, tx);
725 origin->ds_dir->dd_phys->dd_clones =
726 zap_create(mos,
727 DMU_OT_DSL_CLONES, DMU_OT_NONE, 0, tx);
728 }
729 VERIFY0(zap_add_int(mos,
730 origin->ds_dir->dd_phys->dd_clones, dsobj, tx));
731 }
732 }
733
734 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE)
735 dsphys->ds_flags |= DS_FLAG_UNIQUE_ACCURATE;
736
737 dmu_buf_rele(dbuf, FTAG);
738
739 dmu_buf_will_dirty(dd->dd_dbuf, tx);
740 dd->dd_phys->dd_head_dataset_obj = dsobj;
741
742 return (dsobj);
743}
744
745static void
746dsl_dataset_zero_zil(dsl_dataset_t *ds, dmu_tx_t *tx)
747{
748 objset_t *os;
749
750 VERIFY0(dmu_objset_from_ds(ds, &os));
751 bzero(&os->os_zil_header, sizeof (os->os_zil_header));
752 dsl_dataset_dirty(ds, tx);
753}
754
755uint64_t
756dsl_dataset_create_sync(dsl_dir_t *pdd, const char *lastname,
757 dsl_dataset_t *origin, uint64_t flags, cred_t *cr, dmu_tx_t *tx)
758{
759 dsl_pool_t *dp = pdd->dd_pool;
760 uint64_t dsobj, ddobj;
761 dsl_dir_t *dd;
762
763 ASSERT(dmu_tx_is_syncing(tx));
764 ASSERT(lastname[0] != '@');
765
766 ddobj = dsl_dir_create_sync(dp, pdd, lastname, tx);
767 VERIFY0(dsl_dir_hold_obj(dp, ddobj, lastname, FTAG, &dd));
768
769 dsobj = dsl_dataset_create_sync_dd(dd, origin,
770 flags & ~DS_CREATE_FLAG_NODIRTY, tx);
771
772 dsl_deleg_set_create_perms(dd, tx, cr);
773
774 /*
775 * Since we're creating a new node we know it's a leaf, so we can
776 * initialize the counts if the limit feature is active.
777 */
778 if (spa_feature_is_active(dp->dp_spa, SPA_FEATURE_FS_SS_LIMIT)) {
779 uint64_t cnt = 0;
780 objset_t *os = dd->dd_pool->dp_meta_objset;
781
782 dsl_dir_zapify(dd, tx);
783 VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_FILESYSTEM_COUNT,
784 sizeof (cnt), 1, &cnt, tx));
785 VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_SNAPSHOT_COUNT,
786 sizeof (cnt), 1, &cnt, tx));
787 }
788
789 dsl_dir_rele(dd, FTAG);
790
791 /*
792 * If we are creating a clone, make sure we zero out any stale
793 * data from the origin snapshots zil header.
794 */
795 if (origin != NULL && !(flags & DS_CREATE_FLAG_NODIRTY)) {
796 dsl_dataset_t *ds;
797
798 VERIFY0(dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds));
799 dsl_dataset_zero_zil(ds, tx);
800 dsl_dataset_rele(ds, FTAG);
801 }
802
803 return (dsobj);
804}
805
806#ifdef __FreeBSD__
807/* FreeBSD ioctl compat begin */
808struct destroyarg {
809 nvlist_t *nvl;
810 const char *snapname;
811};
812
813static int
814dsl_check_snap_cb(const char *name, void *arg)
815{
816 struct destroyarg *da = arg;
817 dsl_dataset_t *ds;
818 char *dsname;
819
820 dsname = kmem_asprintf("%s@%s", name, da->snapname);
821 fnvlist_add_boolean(da->nvl, dsname);
822 kmem_free(dsname, strlen(dsname) + 1);
823
824 return (0);
825}
826
827int
828dmu_get_recursive_snaps_nvl(char *fsname, const char *snapname,
829 nvlist_t *snaps)
830{
831 struct destroyarg *da;
832 int err;
833
834 da = kmem_zalloc(sizeof (struct destroyarg), KM_SLEEP);
835 da->nvl = snaps;
836 da->snapname = snapname;
837 err = dmu_objset_find(fsname, dsl_check_snap_cb, da,
838 DS_FIND_CHILDREN);
839 kmem_free(da, sizeof (struct destroyarg));
840
841 return (err);
842}
843/* FreeBSD ioctl compat end */
844#endif /* __FreeBSD__ */
845
846/*
847 * The unique space in the head dataset can be calculated by subtracting
848 * the space used in the most recent snapshot, that is still being used
849 * in this file system, from the space currently in use. To figure out
850 * the space in the most recent snapshot still in use, we need to take
851 * the total space used in the snapshot and subtract out the space that
852 * has been freed up since the snapshot was taken.
853 */
854void
855dsl_dataset_recalc_head_uniq(dsl_dataset_t *ds)
856{
857 uint64_t mrs_used;
858 uint64_t dlused, dlcomp, dluncomp;
859
860 ASSERT(!dsl_dataset_is_snapshot(ds));
861
862 if (ds->ds_phys->ds_prev_snap_obj != 0)
863 mrs_used = ds->ds_prev->ds_phys->ds_referenced_bytes;
864 else
865 mrs_used = 0;
866
867 dsl_deadlist_space(&ds->ds_deadlist, &dlused, &dlcomp, &dluncomp);
868
869 ASSERT3U(dlused, <=, mrs_used);
870 ds->ds_phys->ds_unique_bytes =
871 ds->ds_phys->ds_referenced_bytes - (mrs_used - dlused);
872
873 if (spa_version(ds->ds_dir->dd_pool->dp_spa) >=
874 SPA_VERSION_UNIQUE_ACCURATE)
875 ds->ds_phys->ds_flags |= DS_FLAG_UNIQUE_ACCURATE;
876}
877
878void
879dsl_dataset_remove_from_next_clones(dsl_dataset_t *ds, uint64_t obj,
880 dmu_tx_t *tx)
881{
882 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
883 uint64_t count;
884 int err;
885
886 ASSERT(ds->ds_phys->ds_num_children >= 2);
887 err = zap_remove_int(mos, ds->ds_phys->ds_next_clones_obj, obj, tx);
888 /*
889 * The err should not be ENOENT, but a bug in a previous version
890 * of the code could cause upgrade_clones_cb() to not set
891 * ds_next_snap_obj when it should, leading to a missing entry.
892 * If we knew that the pool was created after
893 * SPA_VERSION_NEXT_CLONES, we could assert that it isn't
894 * ENOENT. However, at least we can check that we don't have
895 * too many entries in the next_clones_obj even after failing to
896 * remove this one.
897 */
898 if (err != ENOENT)
899 VERIFY0(err);
900 ASSERT0(zap_count(mos, ds->ds_phys->ds_next_clones_obj,
901 &count));
902 ASSERT3U(count, <=, ds->ds_phys->ds_num_children - 2);
903}
904
905
906blkptr_t *
907dsl_dataset_get_blkptr(dsl_dataset_t *ds)
908{
909 return (&ds->ds_phys->ds_bp);
910}
911
912void
913dsl_dataset_set_blkptr(dsl_dataset_t *ds, blkptr_t *bp, dmu_tx_t *tx)
914{
915 ASSERT(dmu_tx_is_syncing(tx));
916 /* If it's the meta-objset, set dp_meta_rootbp */
917 if (ds == NULL) {
918 tx->tx_pool->dp_meta_rootbp = *bp;
919 } else {
920 dmu_buf_will_dirty(ds->ds_dbuf, tx);
921 ds->ds_phys->ds_bp = *bp;
922 }
923}
924
925spa_t *
926dsl_dataset_get_spa(dsl_dataset_t *ds)
927{
928 return (ds->ds_dir->dd_pool->dp_spa);
929}
930
931void
932dsl_dataset_dirty(dsl_dataset_t *ds, dmu_tx_t *tx)
933{
934 dsl_pool_t *dp;
935
936 if (ds == NULL) /* this is the meta-objset */
937 return;
938
939 ASSERT(ds->ds_objset != NULL);
940
941 if (ds->ds_phys->ds_next_snap_obj != 0)
942 panic("dirtying snapshot!");
943
944 dp = ds->ds_dir->dd_pool;
945
946 if (txg_list_add(&dp->dp_dirty_datasets, ds, tx->tx_txg)) {
947 /* up the hold count until we can be written out */
948 dmu_buf_add_ref(ds->ds_dbuf, ds);
949 }
950}
951
952boolean_t
953dsl_dataset_is_dirty(dsl_dataset_t *ds)
954{
955 for (int t = 0; t < TXG_SIZE; t++) {
956 if (txg_list_member(&ds->ds_dir->dd_pool->dp_dirty_datasets,
957 ds, t))
958 return (B_TRUE);
959 }
960 return (B_FALSE);
961}
962
963static int
964dsl_dataset_snapshot_reserve_space(dsl_dataset_t *ds, dmu_tx_t *tx)
965{
966 uint64_t asize;
967
968 if (!dmu_tx_is_syncing(tx))
969 return (0);
970
971 /*
972 * If there's an fs-only reservation, any blocks that might become
973 * owned by the snapshot dataset must be accommodated by space
974 * outside of the reservation.
975 */
976 ASSERT(ds->ds_reserved == 0 || DS_UNIQUE_IS_ACCURATE(ds));
977 asize = MIN(ds->ds_phys->ds_unique_bytes, ds->ds_reserved);
978 if (asize > dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE))
979 return (SET_ERROR(ENOSPC));
980
981 /*
982 * Propagate any reserved space for this snapshot to other
983 * snapshot checks in this sync group.
984 */
985 if (asize > 0)
986 dsl_dir_willuse_space(ds->ds_dir, asize, tx);
987
988 return (0);
989}
990
991typedef struct dsl_dataset_snapshot_arg {
992 nvlist_t *ddsa_snaps;
993 nvlist_t *ddsa_props;
994 nvlist_t *ddsa_errors;
995 cred_t *ddsa_cr;
996} dsl_dataset_snapshot_arg_t;
997
998int
999dsl_dataset_snapshot_check_impl(dsl_dataset_t *ds, const char *snapname,
1000 dmu_tx_t *tx, boolean_t recv, uint64_t cnt, cred_t *cr)
1001{
1002 int error;
1003 uint64_t value;
1004
1005 ds->ds_trysnap_txg = tx->tx_txg;
1006
1007 if (!dmu_tx_is_syncing(tx))
1008 return (0);
1009
1010 /*
1011 * We don't allow multiple snapshots of the same txg. If there
1012 * is already one, try again.
1013 */
1014 if (ds->ds_phys->ds_prev_snap_txg >= tx->tx_txg)
1015 return (SET_ERROR(EAGAIN));
1016
1017 /*
1018 * Check for conflicting snapshot name.
1019 */
1020 error = dsl_dataset_snap_lookup(ds, snapname, &value);
1021 if (error == 0)
1022 return (SET_ERROR(EEXIST));
1023 if (error != ENOENT)
1024 return (error);
1025
1026 /*
1027 * We don't allow taking snapshots of inconsistent datasets, such as
1028 * those into which we are currently receiving. However, if we are
1029 * creating this snapshot as part of a receive, this check will be
1030 * executed atomically with respect to the completion of the receive
1031 * itself but prior to the clearing of DS_FLAG_INCONSISTENT; in this
1032 * case we ignore this, knowing it will be fixed up for us shortly in
1033 * dmu_recv_end_sync().
1034 */
1035 if (!recv && DS_IS_INCONSISTENT(ds))
1036 return (SET_ERROR(EBUSY));
1037
1038 /*
1039 * Skip the check for temporary snapshots or if we have already checked
1040 * the counts in dsl_dataset_snapshot_check. This means we really only
1041 * check the count here when we're receiving a stream.
1042 */
1043 if (cnt != 0 && cr != NULL) {
1044 error = dsl_fs_ss_limit_check(ds->ds_dir, cnt,
1045 ZFS_PROP_SNAPSHOT_LIMIT, NULL, cr);
1046 if (error != 0)
1047 return (error);
1048 }
1049
1050 error = dsl_dataset_snapshot_reserve_space(ds, tx);
1051 if (error != 0)
1052 return (error);
1053
1054 return (0);
1055}
1056
1057static int
1058dsl_dataset_snapshot_check(void *arg, dmu_tx_t *tx)
1059{
1060 dsl_dataset_snapshot_arg_t *ddsa = arg;
1061 dsl_pool_t *dp = dmu_tx_pool(tx);
1062 nvpair_t *pair;
1063 int rv = 0;
1064
1065 /*
1066 * Pre-compute how many total new snapshots will be created for each
1067 * level in the tree and below. This is needed for validating the
1068 * snapshot limit when either taking a recursive snapshot or when
1069 * taking multiple snapshots.
1070 *
1071 * The problem is that the counts are not actually adjusted when
1072 * we are checking, only when we finally sync. For a single snapshot,
1073 * this is easy, the count will increase by 1 at each node up the tree,
1074 * but its more complicated for the recursive/multiple snapshot case.
1075 *
1076 * The dsl_fs_ss_limit_check function does recursively check the count
1077 * at each level up the tree but since it is validating each snapshot
1078 * independently we need to be sure that we are validating the complete
1079 * count for the entire set of snapshots. We do this by rolling up the
1080 * counts for each component of the name into an nvlist and then
1081 * checking each of those cases with the aggregated count.
1082 *
1083 * This approach properly handles not only the recursive snapshot
1084 * case (where we get all of those on the ddsa_snaps list) but also
1085 * the sibling case (e.g. snapshot a/b and a/c so that we will also
1086 * validate the limit on 'a' using a count of 2).
1087 *
1088 * We validate the snapshot names in the third loop and only report
1089 * name errors once.
1090 */
1091 if (dmu_tx_is_syncing(tx)) {
1092 nvlist_t *cnt_track = NULL;
1093 cnt_track = fnvlist_alloc();
1094
1095 /* Rollup aggregated counts into the cnt_track list */
1096 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL);
1097 pair != NULL;
1098 pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) {
1099 char *pdelim;
1100 uint64_t val;
1101 char nm[MAXPATHLEN];
1102
1103 (void) strlcpy(nm, nvpair_name(pair), sizeof (nm));
1104 pdelim = strchr(nm, '@');
1105 if (pdelim == NULL)
1106 continue;
1107 *pdelim = '\0';
1108
1109 do {
1110 if (nvlist_lookup_uint64(cnt_track, nm,
1111 &val) == 0) {
1112 /* update existing entry */
1113 fnvlist_add_uint64(cnt_track, nm,
1114 val + 1);
1115 } else {
1116 /* add to list */
1117 fnvlist_add_uint64(cnt_track, nm, 1);
1118 }
1119
1120 pdelim = strrchr(nm, '/');
1121 if (pdelim != NULL)
1122 *pdelim = '\0';
1123 } while (pdelim != NULL);
1124 }
1125
1126 /* Check aggregated counts at each level */
1127 for (pair = nvlist_next_nvpair(cnt_track, NULL);
1128 pair != NULL; pair = nvlist_next_nvpair(cnt_track, pair)) {
1129 int error = 0;
1130 char *name;
1131 uint64_t cnt = 0;
1132 dsl_dataset_t *ds;
1133
1134 name = nvpair_name(pair);
1135 cnt = fnvpair_value_uint64(pair);
1136 ASSERT(cnt > 0);
1137
1138 error = dsl_dataset_hold(dp, name, FTAG, &ds);
1139 if (error == 0) {
1140 error = dsl_fs_ss_limit_check(ds->ds_dir, cnt,
1141 ZFS_PROP_SNAPSHOT_LIMIT, NULL,
1142 ddsa->ddsa_cr);
1143 dsl_dataset_rele(ds, FTAG);
1144 }
1145
1146 if (error != 0) {
1147 if (ddsa->ddsa_errors != NULL)
1148 fnvlist_add_int32(ddsa->ddsa_errors,
1149 name, error);
1150 rv = error;
1151 /* only report one error for this check */
1152 break;
1153 }
1154 }
1155 nvlist_free(cnt_track);
1156 }
1157
1158 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL);
1159 pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) {
1160 int error = 0;
1161 dsl_dataset_t *ds;
1162 char *name, *atp;
1163 char dsname[MAXNAMELEN];
1164
1165 name = nvpair_name(pair);
1166 if (strlen(name) >= MAXNAMELEN)
1167 error = SET_ERROR(ENAMETOOLONG);
1168 if (error == 0) {
1169 atp = strchr(name, '@');
1170 if (atp == NULL)
1171 error = SET_ERROR(EINVAL);
1172 if (error == 0)
1173 (void) strlcpy(dsname, name, atp - name + 1);
1174 }
1175 if (error == 0)
1176 error = dsl_dataset_hold(dp, dsname, FTAG, &ds);
1177 if (error == 0) {
1178 /* passing 0/NULL skips dsl_fs_ss_limit_check */
1179 error = dsl_dataset_snapshot_check_impl(ds,
1180 atp + 1, tx, B_FALSE, 0, NULL);
1181 dsl_dataset_rele(ds, FTAG);
1182 }
1183
1184 if (error != 0) {
1185 if (ddsa->ddsa_errors != NULL) {
1186 fnvlist_add_int32(ddsa->ddsa_errors,
1187 name, error);
1188 }
1189 rv = error;
1190 }
1191 }
1192
1193 return (rv);
1194}
1195
1196void
1197dsl_dataset_snapshot_sync_impl(dsl_dataset_t *ds, const char *snapname,
1198 dmu_tx_t *tx)
1199{
1200 static zil_header_t zero_zil;
1201
1202 dsl_pool_t *dp = ds->ds_dir->dd_pool;
1203 dmu_buf_t *dbuf;
1204 dsl_dataset_phys_t *dsphys;
1205 uint64_t dsobj, crtxg;
1206 objset_t *mos = dp->dp_meta_objset;
1207 objset_t *os;
1208
1209 ASSERT(RRW_WRITE_HELD(&dp->dp_config_rwlock));
1210
1211 /*
1212 * If we are on an old pool, the zil must not be active, in which
1213 * case it will be zeroed. Usually zil_suspend() accomplishes this.
1214 */
1215 ASSERT(spa_version(dmu_tx_pool(tx)->dp_spa) >= SPA_VERSION_FAST_SNAP ||
1216 dmu_objset_from_ds(ds, &os) != 0 ||
1217 bcmp(&os->os_phys->os_zil_header, &zero_zil,
1218 sizeof (zero_zil)) == 0);
1219
1220 dsl_fs_ss_count_adjust(ds->ds_dir, 1, DD_FIELD_SNAPSHOT_COUNT, tx);
1221
1222 /*
1223 * The origin's ds_creation_txg has to be < TXG_INITIAL
1224 */
1225 if (strcmp(snapname, ORIGIN_DIR_NAME) == 0)
1226 crtxg = 1;
1227 else
1228 crtxg = tx->tx_txg;
1229
1230 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0,
1231 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx);
1232 VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf));
1233 dmu_buf_will_dirty(dbuf, tx);
1234 dsphys = dbuf->db_data;
1235 bzero(dsphys, sizeof (dsl_dataset_phys_t));
1236 dsphys->ds_dir_obj = ds->ds_dir->dd_object;
1237 dsphys->ds_fsid_guid = unique_create();
1238 do {
1239 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid,
1240 sizeof (dsphys->ds_guid));
1241 } while (dsphys->ds_guid == 0);
1242 dsphys->ds_prev_snap_obj = ds->ds_phys->ds_prev_snap_obj;
1243 dsphys->ds_prev_snap_txg = ds->ds_phys->ds_prev_snap_txg;
1244 dsphys->ds_next_snap_obj = ds->ds_object;
1245 dsphys->ds_num_children = 1;
1246 dsphys->ds_creation_time = gethrestime_sec();
1247 dsphys->ds_creation_txg = crtxg;
1248 dsphys->ds_deadlist_obj = ds->ds_phys->ds_deadlist_obj;
1249 dsphys->ds_referenced_bytes = ds->ds_phys->ds_referenced_bytes;
1250 dsphys->ds_compressed_bytes = ds->ds_phys->ds_compressed_bytes;
1251 dsphys->ds_uncompressed_bytes = ds->ds_phys->ds_uncompressed_bytes;
1252 dsphys->ds_flags = ds->ds_phys->ds_flags;
1253 dsphys->ds_bp = ds->ds_phys->ds_bp;
1254 dmu_buf_rele(dbuf, FTAG);
1255
1256 ASSERT3U(ds->ds_prev != 0, ==, ds->ds_phys->ds_prev_snap_obj != 0);
1257 if (ds->ds_prev) {
1258 uint64_t next_clones_obj =
1259 ds->ds_prev->ds_phys->ds_next_clones_obj;
1260 ASSERT(ds->ds_prev->ds_phys->ds_next_snap_obj ==
1261 ds->ds_object ||
1262 ds->ds_prev->ds_phys->ds_num_children > 1);
1263 if (ds->ds_prev->ds_phys->ds_next_snap_obj == ds->ds_object) {
1264 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx);
1265 ASSERT3U(ds->ds_phys->ds_prev_snap_txg, ==,
1266 ds->ds_prev->ds_phys->ds_creation_txg);
1267 ds->ds_prev->ds_phys->ds_next_snap_obj = dsobj;
1268 } else if (next_clones_obj != 0) {
1269 dsl_dataset_remove_from_next_clones(ds->ds_prev,
1270 dsphys->ds_next_snap_obj, tx);
1271 VERIFY0(zap_add_int(mos,
1272 next_clones_obj, dsobj, tx));
1273 }
1274 }
1275
1276 /*
1277 * If we have a reference-reservation on this dataset, we will
1278 * need to increase the amount of refreservation being charged
1279 * since our unique space is going to zero.
1280 */
1281 if (ds->ds_reserved) {
1282 int64_t delta;
1283 ASSERT(DS_UNIQUE_IS_ACCURATE(ds));
1284 delta = MIN(ds->ds_phys->ds_unique_bytes, ds->ds_reserved);
1285 dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV,
1286 delta, 0, 0, tx);
1287 }
1288
1289 dmu_buf_will_dirty(ds->ds_dbuf, tx);
1290 ds->ds_phys->ds_deadlist_obj = dsl_deadlist_clone(&ds->ds_deadlist,
1291 UINT64_MAX, ds->ds_phys->ds_prev_snap_obj, tx);
1292 dsl_deadlist_close(&ds->ds_deadlist);
1293 dsl_deadlist_open(&ds->ds_deadlist, mos, ds->ds_phys->ds_deadlist_obj);
1294 dsl_deadlist_add_key(&ds->ds_deadlist,
1295 ds->ds_phys->ds_prev_snap_txg, tx);
1296
1297 ASSERT3U(ds->ds_phys->ds_prev_snap_txg, <, tx->tx_txg);
1298 ds->ds_phys->ds_prev_snap_obj = dsobj;
1299 ds->ds_phys->ds_prev_snap_txg = crtxg;
1300 ds->ds_phys->ds_unique_bytes = 0;
1301 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE)
1302 ds->ds_phys->ds_flags |= DS_FLAG_UNIQUE_ACCURATE;
1303
1304 VERIFY0(zap_add(mos, ds->ds_phys->ds_snapnames_zapobj,
1305 snapname, 8, 1, &dsobj, tx));
1306
1307 if (ds->ds_prev)
1308 dsl_dataset_rele(ds->ds_prev, ds);
1309 VERIFY0(dsl_dataset_hold_obj(dp,
1310 ds->ds_phys->ds_prev_snap_obj, ds, &ds->ds_prev));
1311
1312 dsl_scan_ds_snapshotted(ds, tx);
1313
1314 dsl_dir_snap_cmtime_update(ds->ds_dir);
1315
1316 spa_history_log_internal_ds(ds->ds_prev, "snapshot", tx, "");
1317}
1318
1319static void
1320dsl_dataset_snapshot_sync(void *arg, dmu_tx_t *tx)
1321{
1322 dsl_dataset_snapshot_arg_t *ddsa = arg;
1323 dsl_pool_t *dp = dmu_tx_pool(tx);
1324 nvpair_t *pair;
1325
1326 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL);
1327 pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) {
1328 dsl_dataset_t *ds;
1329 char *name, *atp;
1330 char dsname[MAXNAMELEN];
1331
1332 name = nvpair_name(pair);
1333 atp = strchr(name, '@');
1334 (void) strlcpy(dsname, name, atp - name + 1);
1335 VERIFY0(dsl_dataset_hold(dp, dsname, FTAG, &ds));
1336
1337 dsl_dataset_snapshot_sync_impl(ds, atp + 1, tx);
1338 if (ddsa->ddsa_props != NULL) {
1339 dsl_props_set_sync_impl(ds->ds_prev,
1340 ZPROP_SRC_LOCAL, ddsa->ddsa_props, tx);
1341 }
1342 dsl_dataset_rele(ds, FTAG);
1343 }
1344}
1345
1346/*
1347 * The snapshots must all be in the same pool.
1348 * All-or-nothing: if there are any failures, nothing will be modified.
1349 */
1350int
1351dsl_dataset_snapshot(nvlist_t *snaps, nvlist_t *props, nvlist_t *errors)
1352{
1353 dsl_dataset_snapshot_arg_t ddsa;
1354 nvpair_t *pair;
1355 boolean_t needsuspend;
1356 int error;
1357 spa_t *spa;
1358 char *firstname;
1359 nvlist_t *suspended = NULL;
1360
1361 pair = nvlist_next_nvpair(snaps, NULL);
1362 if (pair == NULL)
1363 return (0);
1364 firstname = nvpair_name(pair);
1365
1366 error = spa_open(firstname, &spa, FTAG);
1367 if (error != 0)
1368 return (error);
1369 needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP);
1370 spa_close(spa, FTAG);
1371
1372 if (needsuspend) {
1373 suspended = fnvlist_alloc();
1374 for (pair = nvlist_next_nvpair(snaps, NULL); pair != NULL;
1375 pair = nvlist_next_nvpair(snaps, pair)) {
1376 char fsname[MAXNAMELEN];
1377 char *snapname = nvpair_name(pair);
1378 char *atp;
1379 void *cookie;
1380
1381 atp = strchr(snapname, '@');
1382 if (atp == NULL) {
1383 error = SET_ERROR(EINVAL);
1384 break;
1385 }
1386 (void) strlcpy(fsname, snapname, atp - snapname + 1);
1387
1388 error = zil_suspend(fsname, &cookie);
1389 if (error != 0)
1390 break;
1391 fnvlist_add_uint64(suspended, fsname,
1392 (uintptr_t)cookie);
1393 }
1394 }
1395
1396 ddsa.ddsa_snaps = snaps;
1397 ddsa.ddsa_props = props;
1398 ddsa.ddsa_errors = errors;
1399 ddsa.ddsa_cr = CRED();
1400
1401 if (error == 0) {
1402 error = dsl_sync_task(firstname, dsl_dataset_snapshot_check,
1403 dsl_dataset_snapshot_sync, &ddsa,
1404 fnvlist_num_pairs(snaps) * 3, ZFS_SPACE_CHECK_NORMAL);
1405 }
1406
1407 if (suspended != NULL) {
1408 for (pair = nvlist_next_nvpair(suspended, NULL); pair != NULL;
1409 pair = nvlist_next_nvpair(suspended, pair)) {
1410 zil_resume((void *)(uintptr_t)
1411 fnvpair_value_uint64(pair));
1412 }
1413 fnvlist_free(suspended);
1414 }
1415
1416#ifdef __FreeBSD__
1417#ifdef _KERNEL
1418 if (error == 0) {
1419 for (pair = nvlist_next_nvpair(snaps, NULL); pair != NULL;
1420 pair = nvlist_next_nvpair(snaps, pair)) {
1421 char *snapname = nvpair_name(pair);
1422 zvol_create_minors(snapname);
1423 }
1424 }
1425#endif
1426#endif
1427 return (error);
1428}
1429
1430typedef struct dsl_dataset_snapshot_tmp_arg {
1431 const char *ddsta_fsname;
1432 const char *ddsta_snapname;
1433 minor_t ddsta_cleanup_minor;
1434 const char *ddsta_htag;
1435} dsl_dataset_snapshot_tmp_arg_t;
1436
1437static int
1438dsl_dataset_snapshot_tmp_check(void *arg, dmu_tx_t *tx)
1439{
1440 dsl_dataset_snapshot_tmp_arg_t *ddsta = arg;
1441 dsl_pool_t *dp = dmu_tx_pool(tx);
1442 dsl_dataset_t *ds;
1443 int error;
1444
1445 error = dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds);
1446 if (error != 0)
1447 return (error);
1448
1449 /* NULL cred means no limit check for tmp snapshot */
1450 error = dsl_dataset_snapshot_check_impl(ds, ddsta->ddsta_snapname,
1451 tx, B_FALSE, 0, NULL);
1452 if (error != 0) {
1453 dsl_dataset_rele(ds, FTAG);
1454 return (error);
1455 }
1456
1457 if (spa_version(dp->dp_spa) < SPA_VERSION_USERREFS) {
1458 dsl_dataset_rele(ds, FTAG);
1459 return (SET_ERROR(ENOTSUP));
1460 }
1461 error = dsl_dataset_user_hold_check_one(NULL, ddsta->ddsta_htag,
1462 B_TRUE, tx);
1463 if (error != 0) {
1464 dsl_dataset_rele(ds, FTAG);
1465 return (error);
1466 }
1467
1468 dsl_dataset_rele(ds, FTAG);
1469 return (0);
1470}
1471
1472static void
1473dsl_dataset_snapshot_tmp_sync(void *arg, dmu_tx_t *tx)
1474{
1475 dsl_dataset_snapshot_tmp_arg_t *ddsta = arg;
1476 dsl_pool_t *dp = dmu_tx_pool(tx);
1477 dsl_dataset_t *ds;
1478
1479 VERIFY0(dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds));
1480
1481 dsl_dataset_snapshot_sync_impl(ds, ddsta->ddsta_snapname, tx);
1482 dsl_dataset_user_hold_sync_one(ds->ds_prev, ddsta->ddsta_htag,
1483 ddsta->ddsta_cleanup_minor, gethrestime_sec(), tx);
1484 dsl_destroy_snapshot_sync_impl(ds->ds_prev, B_TRUE, tx);
1485
1486 dsl_dataset_rele(ds, FTAG);
1487}
1488
1489int
1490dsl_dataset_snapshot_tmp(const char *fsname, const char *snapname,
1491 minor_t cleanup_minor, const char *htag)
1492{
1493 dsl_dataset_snapshot_tmp_arg_t ddsta;
1494 int error;
1495 spa_t *spa;
1496 boolean_t needsuspend;
1497 void *cookie;
1498
1499 ddsta.ddsta_fsname = fsname;
1500 ddsta.ddsta_snapname = snapname;
1501 ddsta.ddsta_cleanup_minor = cleanup_minor;
1502 ddsta.ddsta_htag = htag;
1503
1504 error = spa_open(fsname, &spa, FTAG);
1505 if (error != 0)
1506 return (error);
1507 needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP);
1508 spa_close(spa, FTAG);
1509
1510 if (needsuspend) {
1511 error = zil_suspend(fsname, &cookie);
1512 if (error != 0)
1513 return (error);
1514 }
1515
1516 error = dsl_sync_task(fsname, dsl_dataset_snapshot_tmp_check,
1517 dsl_dataset_snapshot_tmp_sync, &ddsta, 3, ZFS_SPACE_CHECK_RESERVED);
1518
1519 if (needsuspend)
1520 zil_resume(cookie);
1521 return (error);
1522}
1523
1524
1525void
1526dsl_dataset_sync(dsl_dataset_t *ds, zio_t *zio, dmu_tx_t *tx)
1527{
1528 ASSERT(dmu_tx_is_syncing(tx));
1529 ASSERT(ds->ds_objset != NULL);
1530 ASSERT(ds->ds_phys->ds_next_snap_obj == 0);
1531
1532 /*
1533 * in case we had to change ds_fsid_guid when we opened it,
1534 * sync it out now.
1535 */
1536 dmu_buf_will_dirty(ds->ds_dbuf, tx);
1537 ds->ds_phys->ds_fsid_guid = ds->ds_fsid_guid;
1538
1539 dmu_objset_sync(ds->ds_objset, zio, tx);
1540}
1541
1542static void
1543get_clones_stat(dsl_dataset_t *ds, nvlist_t *nv)
1544{
1545 uint64_t count = 0;
1546 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
1547 zap_cursor_t zc;
1548 zap_attribute_t za;
1549 nvlist_t *propval = fnvlist_alloc();
1550 nvlist_t *val = fnvlist_alloc();
1551
1552 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool));
1553
1554 /*
1555 * There may be missing entries in ds_next_clones_obj
1556 * due to a bug in a previous version of the code.
1557 * Only trust it if it has the right number of entries.
1558 */
1559 if (ds->ds_phys->ds_next_clones_obj != 0) {
1560 VERIFY0(zap_count(mos, ds->ds_phys->ds_next_clones_obj,
1561 &count));
1562 }
1563 if (count != ds->ds_phys->ds_num_children - 1)
1564 goto fail;
1565 for (zap_cursor_init(&zc, mos, ds->ds_phys->ds_next_clones_obj);
1566 zap_cursor_retrieve(&zc, &za) == 0;
1567 zap_cursor_advance(&zc)) {
1568 dsl_dataset_t *clone;
1569 char buf[ZFS_MAXNAMELEN];
1570 VERIFY0(dsl_dataset_hold_obj(ds->ds_dir->dd_pool,
1571 za.za_first_integer, FTAG, &clone));
1572 dsl_dir_name(clone->ds_dir, buf);
1573 fnvlist_add_boolean(val, buf);
1574 dsl_dataset_rele(clone, FTAG);
1575 }
1576 zap_cursor_fini(&zc);
1577 fnvlist_add_nvlist(propval, ZPROP_VALUE, val);
1578 fnvlist_add_nvlist(nv, zfs_prop_to_name(ZFS_PROP_CLONES), propval);
1579fail:
1580 nvlist_free(val);
1581 nvlist_free(propval);
1582}
1583
1584void
1585dsl_dataset_stats(dsl_dataset_t *ds, nvlist_t *nv)
1586{
1587 dsl_pool_t *dp = ds->ds_dir->dd_pool;
1588 uint64_t refd, avail, uobjs, aobjs, ratio;
1589
1590 ASSERT(dsl_pool_config_held(dp));
1591
1592 ratio = ds->ds_phys->ds_compressed_bytes == 0 ? 100 :
1593 (ds->ds_phys->ds_uncompressed_bytes * 100 /
1594 ds->ds_phys->ds_compressed_bytes);
1595
1596 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRATIO, ratio);
1597 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_LOGICALREFERENCED,
1598 ds->ds_phys->ds_uncompressed_bytes);
1599
1600 if (dsl_dataset_is_snapshot(ds)) {
1601 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_COMPRESSRATIO, ratio);
1602 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USED,
1603 ds->ds_phys->ds_unique_bytes);
1604 get_clones_stat(ds, nv);
1605 } else {
1606 if (ds->ds_prev != NULL && ds->ds_prev != dp->dp_origin_snap) {
1607 char buf[MAXNAMELEN];
1608 dsl_dataset_name(ds->ds_prev, buf);
1609 dsl_prop_nvlist_add_string(nv, ZFS_PROP_PREV_SNAP, buf);
1610 }
1611
1612 dsl_dir_stats(ds->ds_dir, nv);
1613 }
1614
1615 dsl_dataset_space(ds, &refd, &avail, &uobjs, &aobjs);
1616 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_AVAILABLE, avail);
1617 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFERENCED, refd);
1618
1619 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATION,
1620 ds->ds_phys->ds_creation_time);
1621 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATETXG,
1622 ds->ds_phys->ds_creation_txg);
1623 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFQUOTA,
1624 ds->ds_quota);
1625 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRESERVATION,
1626 ds->ds_reserved);
1627 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_GUID,
1628 ds->ds_phys->ds_guid);
1629 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_UNIQUE,
1630 ds->ds_phys->ds_unique_bytes);
1631 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_OBJSETID,
1632 ds->ds_object);
1633 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USERREFS,
1634 ds->ds_userrefs);
1635 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_DEFER_DESTROY,
1636 DS_IS_DEFER_DESTROY(ds) ? 1 : 0);
1637
1638 if (ds->ds_phys->ds_prev_snap_obj != 0) {
1639 uint64_t written, comp, uncomp;
1640 dsl_pool_t *dp = ds->ds_dir->dd_pool;
1641 dsl_dataset_t *prev;
1642
1643 int err = dsl_dataset_hold_obj(dp,
1644 ds->ds_phys->ds_prev_snap_obj, FTAG, &prev);
1645 if (err == 0) {
1646 err = dsl_dataset_space_written(prev, ds, &written,
1647 &comp, &uncomp);
1648 dsl_dataset_rele(prev, FTAG);
1649 if (err == 0) {
1650 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_WRITTEN,
1651 written);
1652 }
1653 }
1654 }
1655}
1656
1657void
1658dsl_dataset_fast_stat(dsl_dataset_t *ds, dmu_objset_stats_t *stat)
1659{
1660 dsl_pool_t *dp = ds->ds_dir->dd_pool;
1661 ASSERT(dsl_pool_config_held(dp));
1662
1663 stat->dds_creation_txg = ds->ds_phys->ds_creation_txg;
1664 stat->dds_inconsistent = ds->ds_phys->ds_flags & DS_FLAG_INCONSISTENT;
1665 stat->dds_guid = ds->ds_phys->ds_guid;
1666 stat->dds_origin[0] = '\0';
1667 if (dsl_dataset_is_snapshot(ds)) {
1668 stat->dds_is_snapshot = B_TRUE;
1669 stat->dds_num_clones = ds->ds_phys->ds_num_children - 1;
1670 } else {
1671 stat->dds_is_snapshot = B_FALSE;
1672 stat->dds_num_clones = 0;
1673
1674 if (dsl_dir_is_clone(ds->ds_dir)) {
1675 dsl_dataset_t *ods;
1676
1677 VERIFY0(dsl_dataset_hold_obj(dp,
1678 ds->ds_dir->dd_phys->dd_origin_obj, FTAG, &ods));
1679 dsl_dataset_name(ods, stat->dds_origin);
1680 dsl_dataset_rele(ods, FTAG);
1681 }
1682 }
1683}
1684
1685uint64_t
1686dsl_dataset_fsid_guid(dsl_dataset_t *ds)
1687{
1688 return (ds->ds_fsid_guid);
1689}
1690
1691void
1692dsl_dataset_space(dsl_dataset_t *ds,
1693 uint64_t *refdbytesp, uint64_t *availbytesp,
1694 uint64_t *usedobjsp, uint64_t *availobjsp)
1695{
1696 *refdbytesp = ds->ds_phys->ds_referenced_bytes;
1697 *availbytesp = dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE);
1698 if (ds->ds_reserved > ds->ds_phys->ds_unique_bytes)
1699 *availbytesp += ds->ds_reserved - ds->ds_phys->ds_unique_bytes;
1700 if (ds->ds_quota != 0) {
1701 /*
1702 * Adjust available bytes according to refquota
1703 */
1704 if (*refdbytesp < ds->ds_quota)
1705 *availbytesp = MIN(*availbytesp,
1706 ds->ds_quota - *refdbytesp);
1707 else
1708 *availbytesp = 0;
1709 }
1710 *usedobjsp = BP_GET_FILL(&ds->ds_phys->ds_bp);
1711 *availobjsp = DN_MAX_OBJECT - *usedobjsp;
1712}
1713
1714boolean_t
1715dsl_dataset_modified_since_snap(dsl_dataset_t *ds, dsl_dataset_t *snap)
1716{
1717 dsl_pool_t *dp = ds->ds_dir->dd_pool;
1718
1719 ASSERT(dsl_pool_config_held(dp));
1720 if (snap == NULL)
1721 return (B_FALSE);
1722 if (ds->ds_phys->ds_bp.blk_birth >
1723 snap->ds_phys->ds_creation_txg) {
1724 objset_t *os, *os_snap;
1725 /*
1726 * It may be that only the ZIL differs, because it was
1727 * reset in the head. Don't count that as being
1728 * modified.
1729 */
1730 if (dmu_objset_from_ds(ds, &os) != 0)
1731 return (B_TRUE);
1732 if (dmu_objset_from_ds(snap, &os_snap) != 0)
1733 return (B_TRUE);
1734 return (bcmp(&os->os_phys->os_meta_dnode,
1735 &os_snap->os_phys->os_meta_dnode,
1736 sizeof (os->os_phys->os_meta_dnode)) != 0);
1737 }
1738 return (B_FALSE);
1739}
1740
1741typedef struct dsl_dataset_rename_snapshot_arg {
1742 const char *ddrsa_fsname;
1743 const char *ddrsa_oldsnapname;
1744 const char *ddrsa_newsnapname;
1745 boolean_t ddrsa_recursive;
1746 dmu_tx_t *ddrsa_tx;
1747} dsl_dataset_rename_snapshot_arg_t;
1748
1749/* ARGSUSED */
1750static int
1751dsl_dataset_rename_snapshot_check_impl(dsl_pool_t *dp,
1752 dsl_dataset_t *hds, void *arg)
1753{
1754 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg;
1755 int error;
1756 uint64_t val;
1757
1758 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val);
1759 if (error != 0) {
1760 /* ignore nonexistent snapshots */
1761 return (error == ENOENT ? 0 : error);
1762 }
1763
1764 /* new name should not exist */
1765 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_newsnapname, &val);
1766 if (error == 0)
1767 error = SET_ERROR(EEXIST);
1768 else if (error == ENOENT)
1769 error = 0;
1770
1771 /* dataset name + 1 for the "@" + the new snapshot name must fit */
1772 if (dsl_dir_namelen(hds->ds_dir) + 1 +
1773 strlen(ddrsa->ddrsa_newsnapname) >= MAXNAMELEN)
1774 error = SET_ERROR(ENAMETOOLONG);
1775
1776 return (error);
1777}
1778
1779static int
1780dsl_dataset_rename_snapshot_check(void *arg, dmu_tx_t *tx)
1781{
1782 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg;
1783 dsl_pool_t *dp = dmu_tx_pool(tx);
1784 dsl_dataset_t *hds;
1785 int error;
1786
1787 error = dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds);
1788 if (error != 0)
1789 return (error);
1790
1791 if (ddrsa->ddrsa_recursive) {
1792 error = dmu_objset_find_dp(dp, hds->ds_dir->dd_object,
1793 dsl_dataset_rename_snapshot_check_impl, ddrsa,
1794 DS_FIND_CHILDREN);
1795 } else {
1796 error = dsl_dataset_rename_snapshot_check_impl(dp, hds, ddrsa);
1797 }
1798 dsl_dataset_rele(hds, FTAG);
1799 return (error);
1800}
1801
1802static int
1803dsl_dataset_rename_snapshot_sync_impl(dsl_pool_t *dp,
1804 dsl_dataset_t *hds, void *arg)
1805{
1806#ifdef __FreeBSD__
1807#ifdef _KERNEL
1808 char *oldname, *newname;
1809#endif
1810#endif
1811 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg;
1812 dsl_dataset_t *ds;
1813 uint64_t val;
1814 dmu_tx_t *tx = ddrsa->ddrsa_tx;
1815 int error;
1816
1817 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val);
1818 ASSERT(error == 0 || error == ENOENT);
1819 if (error == ENOENT) {
1820 /* ignore nonexistent snapshots */
1821 return (0);
1822 }
1823
1824 VERIFY0(dsl_dataset_hold_obj(dp, val, FTAG, &ds));
1825
1826 /* log before we change the name */
1827 spa_history_log_internal_ds(ds, "rename", tx,
1828 "-> @%s", ddrsa->ddrsa_newsnapname);
1829
1830 VERIFY0(dsl_dataset_snap_remove(hds, ddrsa->ddrsa_oldsnapname, tx,
1831 B_FALSE));
1832 mutex_enter(&ds->ds_lock);
1833 (void) strcpy(ds->ds_snapname, ddrsa->ddrsa_newsnapname);
1834 mutex_exit(&ds->ds_lock);
1835 VERIFY0(zap_add(dp->dp_meta_objset, hds->ds_phys->ds_snapnames_zapobj,
1836 ds->ds_snapname, 8, 1, &ds->ds_object, tx));
1837
1838#ifdef __FreeBSD__
1839#ifdef _KERNEL
1840 oldname = kmem_alloc(MAXPATHLEN, KM_SLEEP);
1841 newname = kmem_alloc(MAXPATHLEN, KM_SLEEP);
1842 snprintf(oldname, MAXPATHLEN, "%s@%s", ddrsa->ddrsa_fsname,
1843 ddrsa->ddrsa_oldsnapname);
1844 snprintf(newname, MAXPATHLEN, "%s@%s", ddrsa->ddrsa_fsname,
1845 ddrsa->ddrsa_newsnapname);
1846 zfsvfs_update_fromname(oldname, newname);
1847 zvol_rename_minors(oldname, newname);
1848 kmem_free(newname, MAXPATHLEN);
1849 kmem_free(oldname, MAXPATHLEN);
1850#endif
1851#endif
1852 dsl_dataset_rele(ds, FTAG);
1853
1854 return (0);
1855}
1856
1857static void
1858dsl_dataset_rename_snapshot_sync(void *arg, dmu_tx_t *tx)
1859{
1860 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg;
1861 dsl_pool_t *dp = dmu_tx_pool(tx);
1862 dsl_dataset_t *hds;
1863
1864 VERIFY0(dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds));
1865 ddrsa->ddrsa_tx = tx;
1866 if (ddrsa->ddrsa_recursive) {
1867 VERIFY0(dmu_objset_find_dp(dp, hds->ds_dir->dd_object,
1868 dsl_dataset_rename_snapshot_sync_impl, ddrsa,
1869 DS_FIND_CHILDREN));
1870 } else {
1871 VERIFY0(dsl_dataset_rename_snapshot_sync_impl(dp, hds, ddrsa));
1872 }
1873 dsl_dataset_rele(hds, FTAG);
1874}
1875
1876int
1877dsl_dataset_rename_snapshot(const char *fsname,
1878 const char *oldsnapname, const char *newsnapname, boolean_t recursive)
1879{
1880 dsl_dataset_rename_snapshot_arg_t ddrsa;
1881
1882 ddrsa.ddrsa_fsname = fsname;
1883 ddrsa.ddrsa_oldsnapname = oldsnapname;
1884 ddrsa.ddrsa_newsnapname = newsnapname;
1885 ddrsa.ddrsa_recursive = recursive;
1886
1887 return (dsl_sync_task(fsname, dsl_dataset_rename_snapshot_check,
1888 dsl_dataset_rename_snapshot_sync, &ddrsa,
1889 1, ZFS_SPACE_CHECK_RESERVED));
1890}
1891
1892/*
1893 * If we're doing an ownership handoff, we need to make sure that there is
1894 * only one long hold on the dataset. We're not allowed to change anything here
1895 * so we don't permanently release the long hold or regular hold here. We want
1896 * to do this only when syncing to avoid the dataset unexpectedly going away
1897 * when we release the long hold.
1898 */
1899static int
1900dsl_dataset_handoff_check(dsl_dataset_t *ds, void *owner, dmu_tx_t *tx)
1901{
1902 boolean_t held;
1903
1904 if (!dmu_tx_is_syncing(tx))
1905 return (0);
1906
1907 if (owner != NULL) {
1908 VERIFY3P(ds->ds_owner, ==, owner);
1909 dsl_dataset_long_rele(ds, owner);
1910 }
1911
1912 held = dsl_dataset_long_held(ds);
1913
1914 if (owner != NULL)
1915 dsl_dataset_long_hold(ds, owner);
1916
1917 if (held)
1918 return (SET_ERROR(EBUSY));
1919
1920 return (0);
1921}
1922
1923typedef struct dsl_dataset_rollback_arg {
1924 const char *ddra_fsname;
1925 void *ddra_owner;
1926 nvlist_t *ddra_result;
1927} dsl_dataset_rollback_arg_t;
1928
1929static int
1930dsl_dataset_rollback_check(void *arg, dmu_tx_t *tx)
1931{
1932 dsl_dataset_rollback_arg_t *ddra = arg;
1933 dsl_pool_t *dp = dmu_tx_pool(tx);
1934 dsl_dataset_t *ds;
1935 int64_t unused_refres_delta;
1936 int error;
1937
1938 error = dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds);
1939 if (error != 0)
1940 return (error);
1941
1942 /* must not be a snapshot */
1943 if (dsl_dataset_is_snapshot(ds)) {
1944 dsl_dataset_rele(ds, FTAG);
1945 return (SET_ERROR(EINVAL));
1946 }
1947
1948 /* must have a most recent snapshot */
1949 if (ds->ds_phys->ds_prev_snap_txg < TXG_INITIAL) {
1950 dsl_dataset_rele(ds, FTAG);
1951 return (SET_ERROR(EINVAL));
1952 }
1953
1954 /* must not have any bookmarks after the most recent snapshot */
1955 nvlist_t *proprequest = fnvlist_alloc();
1956 fnvlist_add_boolean(proprequest, zfs_prop_to_name(ZFS_PROP_CREATETXG));
1957 nvlist_t *bookmarks = fnvlist_alloc();
1958 error = dsl_get_bookmarks_impl(ds, proprequest, bookmarks);
1959 fnvlist_free(proprequest);
1960 if (error != 0)
1961 return (error);
1962 for (nvpair_t *pair = nvlist_next_nvpair(bookmarks, NULL);
1963 pair != NULL; pair = nvlist_next_nvpair(bookmarks, pair)) {
1964 nvlist_t *valuenv =
1965 fnvlist_lookup_nvlist(fnvpair_value_nvlist(pair),
1966 zfs_prop_to_name(ZFS_PROP_CREATETXG));
1967 uint64_t createtxg = fnvlist_lookup_uint64(valuenv, "value");
1968 if (createtxg > ds->ds_phys->ds_prev_snap_txg) {
1969 fnvlist_free(bookmarks);
1970 dsl_dataset_rele(ds, FTAG);
1971 return (SET_ERROR(EEXIST));
1972 }
1973 }
1974 fnvlist_free(bookmarks);
1975
1976 error = dsl_dataset_handoff_check(ds, ddra->ddra_owner, tx);
1977 if (error != 0) {
1978 dsl_dataset_rele(ds, FTAG);
1979 return (error);
1980 }
1981
1982 /*
1983 * Check if the snap we are rolling back to uses more than
1984 * the refquota.
1985 */
1986 if (ds->ds_quota != 0 &&
1987 ds->ds_prev->ds_phys->ds_referenced_bytes > ds->ds_quota) {
1988 dsl_dataset_rele(ds, FTAG);
1989 return (SET_ERROR(EDQUOT));
1990 }
1991
1992 /*
1993 * When we do the clone swap, we will temporarily use more space
1994 * due to the refreservation (the head will no longer have any
1995 * unique space, so the entire amount of the refreservation will need
1996 * to be free). We will immediately destroy the clone, freeing
1997 * this space, but the freeing happens over many txg's.
1998 */
1999 unused_refres_delta = (int64_t)MIN(ds->ds_reserved,
2000 ds->ds_phys->ds_unique_bytes);
2001
2002 if (unused_refres_delta > 0 &&
2003 unused_refres_delta >
2004 dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE)) {
2005 dsl_dataset_rele(ds, FTAG);
2006 return (SET_ERROR(ENOSPC));
2007 }
2008
2009 dsl_dataset_rele(ds, FTAG);
2010 return (0);
2011}
2012
2013static void
2014dsl_dataset_rollback_sync(void *arg, dmu_tx_t *tx)
2015{
2016 dsl_dataset_rollback_arg_t *ddra = arg;
2017 dsl_pool_t *dp = dmu_tx_pool(tx);
2018 dsl_dataset_t *ds, *clone;
2019 uint64_t cloneobj;
2020 char namebuf[ZFS_MAXNAMELEN];
2021
2022 VERIFY0(dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds));
2023
2024 dsl_dataset_name(ds->ds_prev, namebuf);
2025 fnvlist_add_string(ddra->ddra_result, "target", namebuf);
2026
2027 cloneobj = dsl_dataset_create_sync(ds->ds_dir, "%rollback",
2028 ds->ds_prev, DS_CREATE_FLAG_NODIRTY, kcred, tx);
2029
2030 VERIFY0(dsl_dataset_hold_obj(dp, cloneobj, FTAG, &clone));
2031
2032 dsl_dataset_clone_swap_sync_impl(clone, ds, tx);
2033 dsl_dataset_zero_zil(ds, tx);
2034
2035 dsl_destroy_head_sync_impl(clone, tx);
2036
2037 dsl_dataset_rele(clone, FTAG);
2038 dsl_dataset_rele(ds, FTAG);
2039}
2040
2041/*
2042 * Rolls back the given filesystem or volume to the most recent snapshot.
2043 * The name of the most recent snapshot will be returned under key "target"
2044 * in the result nvlist.
2045 *
2046 * If owner != NULL:
2047 * - The existing dataset MUST be owned by the specified owner at entry
2048 * - Upon return, dataset will still be held by the same owner, whether we
2049 * succeed or not.
2050 *
2051 * This mode is required any time the existing filesystem is mounted. See
2052 * notes above zfs_suspend_fs() for further details.
2053 */
2054int
2055dsl_dataset_rollback(const char *fsname, void *owner, nvlist_t *result)
2056{
2057 dsl_dataset_rollback_arg_t ddra;
2058
2059 ddra.ddra_fsname = fsname;
2060 ddra.ddra_owner = owner;
2061 ddra.ddra_result = result;
2062
2063 return (dsl_sync_task(fsname, dsl_dataset_rollback_check,
2064 dsl_dataset_rollback_sync, &ddra,
2065 1, ZFS_SPACE_CHECK_RESERVED));
2066}
2067
2068struct promotenode {
2069 list_node_t link;
2070 dsl_dataset_t *ds;
2071};
2072
2073typedef struct dsl_dataset_promote_arg {
2074 const char *ddpa_clonename;
2075 dsl_dataset_t *ddpa_clone;
2076 list_t shared_snaps, origin_snaps, clone_snaps;
2077 dsl_dataset_t *origin_origin; /* origin of the origin */
2078 uint64_t used, comp, uncomp, unique, cloneusedsnap, originusedsnap;
2079 char *err_ds;
2080 cred_t *cr;
2081} dsl_dataset_promote_arg_t;
2082
2083static int snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep);
2084static int promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp,
2085 void *tag);
2086static void promote_rele(dsl_dataset_promote_arg_t *ddpa, void *tag);
2087
2088static int
2089dsl_dataset_promote_check(void *arg, dmu_tx_t *tx)
2090{
2091 dsl_dataset_promote_arg_t *ddpa = arg;
2092 dsl_pool_t *dp = dmu_tx_pool(tx);
2093 dsl_dataset_t *hds;
2094 struct promotenode *snap;
2095 dsl_dataset_t *origin_ds;
2096 int err;
2097 uint64_t unused;
2098 uint64_t ss_mv_cnt;
2099
2100 err = promote_hold(ddpa, dp, FTAG);
2101 if (err != 0)
2102 return (err);
2103
2104 hds = ddpa->ddpa_clone;
2105
2106 if (hds->ds_phys->ds_flags & DS_FLAG_NOPROMOTE) {
2107 promote_rele(ddpa, FTAG);
2108 return (SET_ERROR(EXDEV));
2109 }
2110
2111 /*
2112 * Compute and check the amount of space to transfer. Since this is
2113 * so expensive, don't do the preliminary check.
2114 */
2115 if (!dmu_tx_is_syncing(tx)) {
2116 promote_rele(ddpa, FTAG);
2117 return (0);
2118 }
2119
2120 snap = list_head(&ddpa->shared_snaps);
2121 origin_ds = snap->ds;
2122
2123 /* compute origin's new unique space */
2124 snap = list_tail(&ddpa->clone_snaps);
2125 ASSERT3U(snap->ds->ds_phys->ds_prev_snap_obj, ==, origin_ds->ds_object);
2126 dsl_deadlist_space_range(&snap->ds->ds_deadlist,
2127 origin_ds->ds_phys->ds_prev_snap_txg, UINT64_MAX,
2128 &ddpa->unique, &unused, &unused);
2129
2130 /*
2131 * Walk the snapshots that we are moving
2132 *
2133 * Compute space to transfer. Consider the incremental changes
2134 * to used by each snapshot:
2135 * (my used) = (prev's used) + (blocks born) - (blocks killed)
2136 * So each snapshot gave birth to:
2137 * (blocks born) = (my used) - (prev's used) + (blocks killed)
2138 * So a sequence would look like:
2139 * (uN - u(N-1) + kN) + ... + (u1 - u0 + k1) + (u0 - 0 + k0)
2140 * Which simplifies to:
2141 * uN + kN + kN-1 + ... + k1 + k0
2142 * Note however, if we stop before we reach the ORIGIN we get:
2143 * uN + kN + kN-1 + ... + kM - uM-1
2144 */
2145 ss_mv_cnt = 0;
2146 ddpa->used = origin_ds->ds_phys->ds_referenced_bytes;
2147 ddpa->comp = origin_ds->ds_phys->ds_compressed_bytes;
2148 ddpa->uncomp = origin_ds->ds_phys->ds_uncompressed_bytes;
2149 for (snap = list_head(&ddpa->shared_snaps); snap;
2150 snap = list_next(&ddpa->shared_snaps, snap)) {
2151 uint64_t val, dlused, dlcomp, dluncomp;
2152 dsl_dataset_t *ds = snap->ds;
2153
2154 ss_mv_cnt++;
2155
2156 /*
2157 * If there are long holds, we won't be able to evict
2158 * the objset.
2159 */
2160 if (dsl_dataset_long_held(ds)) {
2161 err = SET_ERROR(EBUSY);
2162 goto out;
2163 }
2164
2165 /* Check that the snapshot name does not conflict */
2166 VERIFY0(dsl_dataset_get_snapname(ds));
2167 err = dsl_dataset_snap_lookup(hds, ds->ds_snapname, &val);
2168 if (err == 0) {
2169 (void) strcpy(ddpa->err_ds, snap->ds->ds_snapname);
2170 err = SET_ERROR(EEXIST);
2171 goto out;
2172 }
2173 if (err != ENOENT)
2174 goto out;
2175
2176 /* The very first snapshot does not have a deadlist */
2177 if (ds->ds_phys->ds_prev_snap_obj == 0)
2178 continue;
2179
2180 dsl_deadlist_space(&ds->ds_deadlist,
2181 &dlused, &dlcomp, &dluncomp);
2182 ddpa->used += dlused;
2183 ddpa->comp += dlcomp;
2184 ddpa->uncomp += dluncomp;
2185 }
2186
2187 /*
2188 * If we are a clone of a clone then we never reached ORIGIN,
2189 * so we need to subtract out the clone origin's used space.
2190 */
2191 if (ddpa->origin_origin) {
2192 ddpa->used -= ddpa->origin_origin->ds_phys->ds_referenced_bytes;
2193 ddpa->comp -= ddpa->origin_origin->ds_phys->ds_compressed_bytes;
2194 ddpa->uncomp -=
2195 ddpa->origin_origin->ds_phys->ds_uncompressed_bytes;
2196 }
2197
2198 /* Check that there is enough space and limit headroom here */
2199 err = dsl_dir_transfer_possible(origin_ds->ds_dir, hds->ds_dir,
2200 0, ss_mv_cnt, ddpa->used, ddpa->cr);
2201 if (err != 0)
2202 goto out;
2203
2204 /*
2205 * Compute the amounts of space that will be used by snapshots
2206 * after the promotion (for both origin and clone). For each,
2207 * it is the amount of space that will be on all of their
2208 * deadlists (that was not born before their new origin).
2209 */
2210 if (hds->ds_dir->dd_phys->dd_flags & DD_FLAG_USED_BREAKDOWN) {
2211 uint64_t space;
2212
2213 /*
2214 * Note, typically this will not be a clone of a clone,
2215 * so dd_origin_txg will be < TXG_INITIAL, so
2216 * these snaplist_space() -> dsl_deadlist_space_range()
2217 * calls will be fast because they do not have to
2218 * iterate over all bps.
2219 */
2220 snap = list_head(&ddpa->origin_snaps);
2221 err = snaplist_space(&ddpa->shared_snaps,
2222 snap->ds->ds_dir->dd_origin_txg, &ddpa->cloneusedsnap);
2223 if (err != 0)
2224 goto out;
2225
2226 err = snaplist_space(&ddpa->clone_snaps,
2227 snap->ds->ds_dir->dd_origin_txg, &space);
2228 if (err != 0)
2229 goto out;
2230 ddpa->cloneusedsnap += space;
2231 }
2232 if (origin_ds->ds_dir->dd_phys->dd_flags & DD_FLAG_USED_BREAKDOWN) {
2233 err = snaplist_space(&ddpa->origin_snaps,
2234 origin_ds->ds_phys->ds_creation_txg, &ddpa->originusedsnap);
2235 if (err != 0)
2236 goto out;
2237 }
2238
2239out:
2240 promote_rele(ddpa, FTAG);
2241 return (err);
2242}
2243
2244static void
2245dsl_dataset_promote_sync(void *arg, dmu_tx_t *tx)
2246{
2247 dsl_dataset_promote_arg_t *ddpa = arg;
2248 dsl_pool_t *dp = dmu_tx_pool(tx);
2249 dsl_dataset_t *hds;
2250 struct promotenode *snap;
2251 dsl_dataset_t *origin_ds;
2252 dsl_dataset_t *origin_head;
2253 dsl_dir_t *dd;
2254 dsl_dir_t *odd = NULL;
2255 uint64_t oldnext_obj;
2256 int64_t delta;
2257
2258 VERIFY0(promote_hold(ddpa, dp, FTAG));
2259 hds = ddpa->ddpa_clone;
2260
2261 ASSERT0(hds->ds_phys->ds_flags & DS_FLAG_NOPROMOTE);
2262
2263 snap = list_head(&ddpa->shared_snaps);
2264 origin_ds = snap->ds;
2265 dd = hds->ds_dir;
2266
2267 snap = list_head(&ddpa->origin_snaps);
2268 origin_head = snap->ds;
2269
2270 /*
2271 * We need to explicitly open odd, since origin_ds's dd will be
2272 * changing.
2273 */
2274 VERIFY0(dsl_dir_hold_obj(dp, origin_ds->ds_dir->dd_object,
2275 NULL, FTAG, &odd));
2276
2277 /* change origin's next snap */
2278 dmu_buf_will_dirty(origin_ds->ds_dbuf, tx);
2279 oldnext_obj = origin_ds->ds_phys->ds_next_snap_obj;
2280 snap = list_tail(&ddpa->clone_snaps);
2281 ASSERT3U(snap->ds->ds_phys->ds_prev_snap_obj, ==, origin_ds->ds_object);
2282 origin_ds->ds_phys->ds_next_snap_obj = snap->ds->ds_object;
2283
2284 /* change the origin's next clone */
2285 if (origin_ds->ds_phys->ds_next_clones_obj) {
2286 dsl_dataset_remove_from_next_clones(origin_ds,
2287 snap->ds->ds_object, tx);
2288 VERIFY0(zap_add_int(dp->dp_meta_objset,
2289 origin_ds->ds_phys->ds_next_clones_obj,
2290 oldnext_obj, tx));
2291 }
2292
2293 /* change origin */
2294 dmu_buf_will_dirty(dd->dd_dbuf, tx);
2295 ASSERT3U(dd->dd_phys->dd_origin_obj, ==, origin_ds->ds_object);
2296 dd->dd_phys->dd_origin_obj = odd->dd_phys->dd_origin_obj;
2297 dd->dd_origin_txg = origin_head->ds_dir->dd_origin_txg;
2298 dmu_buf_will_dirty(odd->dd_dbuf, tx);
2299 odd->dd_phys->dd_origin_obj = origin_ds->ds_object;
2300 origin_head->ds_dir->dd_origin_txg =
2301 origin_ds->ds_phys->ds_creation_txg;
2302
2303 /* change dd_clone entries */
2304 if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) {
2305 VERIFY0(zap_remove_int(dp->dp_meta_objset,
2306 odd->dd_phys->dd_clones, hds->ds_object, tx));
2307 VERIFY0(zap_add_int(dp->dp_meta_objset,
2308 ddpa->origin_origin->ds_dir->dd_phys->dd_clones,
2309 hds->ds_object, tx));
2310
2311 VERIFY0(zap_remove_int(dp->dp_meta_objset,
2312 ddpa->origin_origin->ds_dir->dd_phys->dd_clones,
2313 origin_head->ds_object, tx));
2314 if (dd->dd_phys->dd_clones == 0) {
2315 dd->dd_phys->dd_clones = zap_create(dp->dp_meta_objset,
2316 DMU_OT_DSL_CLONES, DMU_OT_NONE, 0, tx);
2317 }
2318 VERIFY0(zap_add_int(dp->dp_meta_objset,
2319 dd->dd_phys->dd_clones, origin_head->ds_object, tx));
2320 }
2321
2322 /* move snapshots to this dir */
2323 for (snap = list_head(&ddpa->shared_snaps); snap;
2324 snap = list_next(&ddpa->shared_snaps, snap)) {
2325 dsl_dataset_t *ds = snap->ds;
2326
2327 /*
2328 * Property callbacks are registered to a particular
2329 * dsl_dir. Since ours is changing, evict the objset
2330 * so that they will be unregistered from the old dsl_dir.
2331 */
2332 if (ds->ds_objset) {
2333 dmu_objset_evict(ds->ds_objset);
2334 ds->ds_objset = NULL;
2335 }
2336
2337 /* move snap name entry */
2338 VERIFY0(dsl_dataset_get_snapname(ds));
2339 VERIFY0(dsl_dataset_snap_remove(origin_head,
2340 ds->ds_snapname, tx, B_TRUE));
2341 VERIFY0(zap_add(dp->dp_meta_objset,
2342 hds->ds_phys->ds_snapnames_zapobj, ds->ds_snapname,
2343 8, 1, &ds->ds_object, tx));
2344 dsl_fs_ss_count_adjust(hds->ds_dir, 1,
2345 DD_FIELD_SNAPSHOT_COUNT, tx);
2346
2347 /* change containing dsl_dir */
2348 dmu_buf_will_dirty(ds->ds_dbuf, tx);
2349 ASSERT3U(ds->ds_phys->ds_dir_obj, ==, odd->dd_object);
2350 ds->ds_phys->ds_dir_obj = dd->dd_object;
2351 ASSERT3P(ds->ds_dir, ==, odd);
2352 dsl_dir_rele(ds->ds_dir, ds);
2353 VERIFY0(dsl_dir_hold_obj(dp, dd->dd_object,
2354 NULL, ds, &ds->ds_dir));
2355
2356 /* move any clone references */
2357 if (ds->ds_phys->ds_next_clones_obj &&
2358 spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) {
2359 zap_cursor_t zc;
2360 zap_attribute_t za;
2361
2362 for (zap_cursor_init(&zc, dp->dp_meta_objset,
2363 ds->ds_phys->ds_next_clones_obj);
2364 zap_cursor_retrieve(&zc, &za) == 0;
2365 zap_cursor_advance(&zc)) {
2366 dsl_dataset_t *cnds;
2367 uint64_t o;
2368
2369 if (za.za_first_integer == oldnext_obj) {
2370 /*
2371 * We've already moved the
2372 * origin's reference.
2373 */
2374 continue;
2375 }
2376
2377 VERIFY0(dsl_dataset_hold_obj(dp,
2378 za.za_first_integer, FTAG, &cnds));
2379 o = cnds->ds_dir->dd_phys->dd_head_dataset_obj;
2380
2381 VERIFY0(zap_remove_int(dp->dp_meta_objset,
2382 odd->dd_phys->dd_clones, o, tx));
2383 VERIFY0(zap_add_int(dp->dp_meta_objset,
2384 dd->dd_phys->dd_clones, o, tx));
2385 dsl_dataset_rele(cnds, FTAG);
2386 }
2387 zap_cursor_fini(&zc);
2388 }
2389
2390 ASSERT(!dsl_prop_hascb(ds));
2391 }
2392
2393 /*
2394 * Change space accounting.
2395 * Note, pa->*usedsnap and dd_used_breakdown[SNAP] will either
2396 * both be valid, or both be 0 (resulting in delta == 0). This
2397 * is true for each of {clone,origin} independently.
2398 */
2399
2400 delta = ddpa->cloneusedsnap -
2401 dd->dd_phys->dd_used_breakdown[DD_USED_SNAP];
2402 ASSERT3S(delta, >=, 0);
2403 ASSERT3U(ddpa->used, >=, delta);
2404 dsl_dir_diduse_space(dd, DD_USED_SNAP, delta, 0, 0, tx);
2405 dsl_dir_diduse_space(dd, DD_USED_HEAD,
2406 ddpa->used - delta, ddpa->comp, ddpa->uncomp, tx);
2407
2408 delta = ddpa->originusedsnap -
2409 odd->dd_phys->dd_used_breakdown[DD_USED_SNAP];
2410 ASSERT3S(delta, <=, 0);
2411 ASSERT3U(ddpa->used, >=, -delta);
2412 dsl_dir_diduse_space(odd, DD_USED_SNAP, delta, 0, 0, tx);
2413 dsl_dir_diduse_space(odd, DD_USED_HEAD,
2414 -ddpa->used - delta, -ddpa->comp, -ddpa->uncomp, tx);
2415
2416 origin_ds->ds_phys->ds_unique_bytes = ddpa->unique;
2417
2418 /* log history record */
2419 spa_history_log_internal_ds(hds, "promote", tx, "");
2420
2421 dsl_dir_rele(odd, FTAG);
2422 promote_rele(ddpa, FTAG);
2423}
2424
2425/*
2426 * Make a list of dsl_dataset_t's for the snapshots between first_obj
2427 * (exclusive) and last_obj (inclusive). The list will be in reverse
2428 * order (last_obj will be the list_head()). If first_obj == 0, do all
2429 * snapshots back to this dataset's origin.
2430 */
2431static int
2432snaplist_make(dsl_pool_t *dp,
2433 uint64_t first_obj, uint64_t last_obj, list_t *l, void *tag)
2434{
2435 uint64_t obj = last_obj;
2436
2437 list_create(l, sizeof (struct promotenode),
2438 offsetof(struct promotenode, link));
2439
2440 while (obj != first_obj) {
2441 dsl_dataset_t *ds;
2442 struct promotenode *snap;
2443 int err;
2444
2445 err = dsl_dataset_hold_obj(dp, obj, tag, &ds);
2446 ASSERT(err != ENOENT);
2447 if (err != 0)
2448 return (err);
2449
2450 if (first_obj == 0)
2451 first_obj = ds->ds_dir->dd_phys->dd_origin_obj;
2452
2453 snap = kmem_alloc(sizeof (*snap), KM_SLEEP);
2454 snap->ds = ds;
2455 list_insert_tail(l, snap);
2456 obj = ds->ds_phys->ds_prev_snap_obj;
2457 }
2458
2459 return (0);
2460}
2461
2462static int
2463snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep)
2464{
2465 struct promotenode *snap;
2466
2467 *spacep = 0;
2468 for (snap = list_head(l); snap; snap = list_next(l, snap)) {
2469 uint64_t used, comp, uncomp;
2470 dsl_deadlist_space_range(&snap->ds->ds_deadlist,
2471 mintxg, UINT64_MAX, &used, &comp, &uncomp);
2472 *spacep += used;
2473 }
2474 return (0);
2475}
2476
2477static void
2478snaplist_destroy(list_t *l, void *tag)
2479{
2480 struct promotenode *snap;
2481
2482 if (l == NULL || !list_link_active(&l->list_head))
2483 return;
2484
2485 while ((snap = list_tail(l)) != NULL) {
2486 list_remove(l, snap);
2487 dsl_dataset_rele(snap->ds, tag);
2488 kmem_free(snap, sizeof (*snap));
2489 }
2490 list_destroy(l);
2491}
2492
2493static int
2494promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp, void *tag)
2495{
2496 int error;
2497 dsl_dir_t *dd;
2498 struct promotenode *snap;
2499
2500 error = dsl_dataset_hold(dp, ddpa->ddpa_clonename, tag,
2501 &ddpa->ddpa_clone);
2502 if (error != 0)
2503 return (error);
2504 dd = ddpa->ddpa_clone->ds_dir;
2505
2506 if (dsl_dataset_is_snapshot(ddpa->ddpa_clone) ||
2507 !dsl_dir_is_clone(dd)) {
2508 dsl_dataset_rele(ddpa->ddpa_clone, tag);
2509 return (SET_ERROR(EINVAL));
2510 }
2511
2512 error = snaplist_make(dp, 0, dd->dd_phys->dd_origin_obj,
2513 &ddpa->shared_snaps, tag);
2514 if (error != 0)
2515 goto out;
2516
2517 error = snaplist_make(dp, 0, ddpa->ddpa_clone->ds_object,
2518 &ddpa->clone_snaps, tag);
2519 if (error != 0)
2520 goto out;
2521
2522 snap = list_head(&ddpa->shared_snaps);
2523 ASSERT3U(snap->ds->ds_object, ==, dd->dd_phys->dd_origin_obj);
2524 error = snaplist_make(dp, dd->dd_phys->dd_origin_obj,
2525 snap->ds->ds_dir->dd_phys->dd_head_dataset_obj,
2526 &ddpa->origin_snaps, tag);
2527 if (error != 0)
2528 goto out;
2529
2530 if (snap->ds->ds_dir->dd_phys->dd_origin_obj != 0) {
2531 error = dsl_dataset_hold_obj(dp,
2532 snap->ds->ds_dir->dd_phys->dd_origin_obj,
2533 tag, &ddpa->origin_origin);
2534 if (error != 0)
2535 goto out;
2536 }
2537out:
2538 if (error != 0)
2539 promote_rele(ddpa, tag);
2540 return (error);
2541}
2542
2543static void
2544promote_rele(dsl_dataset_promote_arg_t *ddpa, void *tag)
2545{
2546 snaplist_destroy(&ddpa->shared_snaps, tag);
2547 snaplist_destroy(&ddpa->clone_snaps, tag);
2548 snaplist_destroy(&ddpa->origin_snaps, tag);
2549 if (ddpa->origin_origin != NULL)
2550 dsl_dataset_rele(ddpa->origin_origin, tag);
2551 dsl_dataset_rele(ddpa->ddpa_clone, tag);
2552}
2553
2554/*
2555 * Promote a clone.
2556 *
2557 * If it fails due to a conflicting snapshot name, "conflsnap" will be filled
2558 * in with the name. (It must be at least MAXNAMELEN bytes long.)
2559 */
2560int
2561dsl_dataset_promote(const char *name, char *conflsnap)
2562{
2563 dsl_dataset_promote_arg_t ddpa = { 0 };
2564 uint64_t numsnaps;
2565 int error;
2566 objset_t *os;
2567
2568 /*
2569 * We will modify space proportional to the number of
2570 * snapshots. Compute numsnaps.
2571 */
2572 error = dmu_objset_hold(name, FTAG, &os);
2573 if (error != 0)
2574 return (error);
2575 error = zap_count(dmu_objset_pool(os)->dp_meta_objset,
2576 dmu_objset_ds(os)->ds_phys->ds_snapnames_zapobj, &numsnaps);
2577 dmu_objset_rele(os, FTAG);
2578 if (error != 0)
2579 return (error);
2580
2581 ddpa.ddpa_clonename = name;
2582 ddpa.err_ds = conflsnap;
2583 ddpa.cr = CRED();
2584
2585 return (dsl_sync_task(name, dsl_dataset_promote_check,
2586 dsl_dataset_promote_sync, &ddpa,
2587 2 + numsnaps, ZFS_SPACE_CHECK_RESERVED));
2588}
2589
2590int
2591dsl_dataset_clone_swap_check_impl(dsl_dataset_t *clone,
2592 dsl_dataset_t *origin_head, boolean_t force, void *owner, dmu_tx_t *tx)
2593{
2594 int64_t unused_refres_delta;
2595
2596 /* they should both be heads */
2597 if (dsl_dataset_is_snapshot(clone) ||
2598 dsl_dataset_is_snapshot(origin_head))
2599 return (SET_ERROR(EINVAL));
2600
2601 /* if we are not forcing, the branch point should be just before them */
2602 if (!force && clone->ds_prev != origin_head->ds_prev)
2603 return (SET_ERROR(EINVAL));
2604
2605 /* clone should be the clone (unless they are unrelated) */
2606 if (clone->ds_prev != NULL &&
2607 clone->ds_prev != clone->ds_dir->dd_pool->dp_origin_snap &&
2608 origin_head->ds_dir != clone->ds_prev->ds_dir)
2609 return (SET_ERROR(EINVAL));
2610
2611 /* the clone should be a child of the origin */
2612 if (clone->ds_dir->dd_parent != origin_head->ds_dir)
2613 return (SET_ERROR(EINVAL));
2614
2615 /* origin_head shouldn't be modified unless 'force' */
2616 if (!force &&
2617 dsl_dataset_modified_since_snap(origin_head, origin_head->ds_prev))
2618 return (SET_ERROR(ETXTBSY));
2619
2620 /* origin_head should have no long holds (e.g. is not mounted) */
2621 if (dsl_dataset_handoff_check(origin_head, owner, tx))
2622 return (SET_ERROR(EBUSY));
2623
2624 /* check amount of any unconsumed refreservation */
2625 unused_refres_delta =
2626 (int64_t)MIN(origin_head->ds_reserved,
2627 origin_head->ds_phys->ds_unique_bytes) -
2628 (int64_t)MIN(origin_head->ds_reserved,
2629 clone->ds_phys->ds_unique_bytes);
2630
2631 if (unused_refres_delta > 0 &&
2632 unused_refres_delta >
2633 dsl_dir_space_available(origin_head->ds_dir, NULL, 0, TRUE))
2634 return (SET_ERROR(ENOSPC));
2635
2636 /* clone can't be over the head's refquota */
2637 if (origin_head->ds_quota != 0 &&
2638 clone->ds_phys->ds_referenced_bytes > origin_head->ds_quota)
2639 return (SET_ERROR(EDQUOT));
2640
2641 return (0);
2642}
2643
2644void
2645dsl_dataset_clone_swap_sync_impl(dsl_dataset_t *clone,
2646 dsl_dataset_t *origin_head, dmu_tx_t *tx)
2647{
2648 dsl_pool_t *dp = dmu_tx_pool(tx);
2649 int64_t unused_refres_delta;
2650
2651 ASSERT(clone->ds_reserved == 0);
2652 ASSERT(origin_head->ds_quota == 0 ||
2653 clone->ds_phys->ds_unique_bytes <= origin_head->ds_quota);
2654 ASSERT3P(clone->ds_prev, ==, origin_head->ds_prev);
2655
2656 dmu_buf_will_dirty(clone->ds_dbuf, tx);
2657 dmu_buf_will_dirty(origin_head->ds_dbuf, tx);
2658
2659 if (clone->ds_objset != NULL) {
2660 dmu_objset_evict(clone->ds_objset);
2661 clone->ds_objset = NULL;
2662 }
2663
2664 if (origin_head->ds_objset != NULL) {
2665 dmu_objset_evict(origin_head->ds_objset);
2666 origin_head->ds_objset = NULL;
2667 }
2668
2669 unused_refres_delta =
2670 (int64_t)MIN(origin_head->ds_reserved,
2671 origin_head->ds_phys->ds_unique_bytes) -
2672 (int64_t)MIN(origin_head->ds_reserved,
2673 clone->ds_phys->ds_unique_bytes);
2674
2675 /*
2676 * Reset origin's unique bytes, if it exists.
2677 */
2678 if (clone->ds_prev) {
2679 dsl_dataset_t *origin = clone->ds_prev;
2680 uint64_t comp, uncomp;
2681
2682 dmu_buf_will_dirty(origin->ds_dbuf, tx);
2683 dsl_deadlist_space_range(&clone->ds_deadlist,
2684 origin->ds_phys->ds_prev_snap_txg, UINT64_MAX,
2685 &origin->ds_phys->ds_unique_bytes, &comp, &uncomp);
2686 }
2687
2688 /* swap blkptrs */
2689 {
2690 blkptr_t tmp;
2691 tmp = origin_head->ds_phys->ds_bp;
2692 origin_head->ds_phys->ds_bp = clone->ds_phys->ds_bp;
2693 clone->ds_phys->ds_bp = tmp;
2694 }
2695
2696 /* set dd_*_bytes */
2697 {
2698 int64_t dused, dcomp, duncomp;
2699 uint64_t cdl_used, cdl_comp, cdl_uncomp;
2700 uint64_t odl_used, odl_comp, odl_uncomp;
2701
2702 ASSERT3U(clone->ds_dir->dd_phys->
2703 dd_used_breakdown[DD_USED_SNAP], ==, 0);
2704
2705 dsl_deadlist_space(&clone->ds_deadlist,
2706 &cdl_used, &cdl_comp, &cdl_uncomp);
2707 dsl_deadlist_space(&origin_head->ds_deadlist,
2708 &odl_used, &odl_comp, &odl_uncomp);
2709
2710 dused = clone->ds_phys->ds_referenced_bytes + cdl_used -
2711 (origin_head->ds_phys->ds_referenced_bytes + odl_used);
2712 dcomp = clone->ds_phys->ds_compressed_bytes + cdl_comp -
2713 (origin_head->ds_phys->ds_compressed_bytes + odl_comp);
2714 duncomp = clone->ds_phys->ds_uncompressed_bytes +
2715 cdl_uncomp -
2716 (origin_head->ds_phys->ds_uncompressed_bytes + odl_uncomp);
2717
2718 dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_HEAD,
2719 dused, dcomp, duncomp, tx);
2720 dsl_dir_diduse_space(clone->ds_dir, DD_USED_HEAD,
2721 -dused, -dcomp, -duncomp, tx);
2722
2723 /*
2724 * The difference in the space used by snapshots is the
2725 * difference in snapshot space due to the head's
2726 * deadlist (since that's the only thing that's
2727 * changing that affects the snapused).
2728 */
2729 dsl_deadlist_space_range(&clone->ds_deadlist,
2730 origin_head->ds_dir->dd_origin_txg, UINT64_MAX,
2731 &cdl_used, &cdl_comp, &cdl_uncomp);
2732 dsl_deadlist_space_range(&origin_head->ds_deadlist,
2733 origin_head->ds_dir->dd_origin_txg, UINT64_MAX,
2734 &odl_used, &odl_comp, &odl_uncomp);
2735 dsl_dir_transfer_space(origin_head->ds_dir, cdl_used - odl_used,
2736 DD_USED_HEAD, DD_USED_SNAP, tx);
2737 }
2738
2739 /* swap ds_*_bytes */
2740 SWITCH64(origin_head->ds_phys->ds_referenced_bytes,
2741 clone->ds_phys->ds_referenced_bytes);
2742 SWITCH64(origin_head->ds_phys->ds_compressed_bytes,
2743 clone->ds_phys->ds_compressed_bytes);
2744 SWITCH64(origin_head->ds_phys->ds_uncompressed_bytes,
2745 clone->ds_phys->ds_uncompressed_bytes);
2746 SWITCH64(origin_head->ds_phys->ds_unique_bytes,
2747 clone->ds_phys->ds_unique_bytes);
2748
2749 /* apply any parent delta for change in unconsumed refreservation */
2750 dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_REFRSRV,
2751 unused_refres_delta, 0, 0, tx);
2752
2753 /*
2754 * Swap deadlists.
2755 */
2756 dsl_deadlist_close(&clone->ds_deadlist);
2757 dsl_deadlist_close(&origin_head->ds_deadlist);
2758 SWITCH64(origin_head->ds_phys->ds_deadlist_obj,
2759 clone->ds_phys->ds_deadlist_obj);
2760 dsl_deadlist_open(&clone->ds_deadlist, dp->dp_meta_objset,
2761 clone->ds_phys->ds_deadlist_obj);
2762 dsl_deadlist_open(&origin_head->ds_deadlist, dp->dp_meta_objset,
2763 origin_head->ds_phys->ds_deadlist_obj);
2764
2765 dsl_scan_ds_clone_swapped(origin_head, clone, tx);
2766
2767 spa_history_log_internal_ds(clone, "clone swap", tx,
2768 "parent=%s", origin_head->ds_dir->dd_myname);
2769}
2770
2771/*
2772 * Given a pool name and a dataset object number in that pool,
2773 * return the name of that dataset.
2774 */
2775int
2776dsl_dsobj_to_dsname(char *pname, uint64_t obj, char *buf)
2777{
2778 dsl_pool_t *dp;
2779 dsl_dataset_t *ds;
2780 int error;
2781
2782 error = dsl_pool_hold(pname, FTAG, &dp);
2783 if (error != 0)
2784 return (error);
2785
2786 error = dsl_dataset_hold_obj(dp, obj, FTAG, &ds);
2787 if (error == 0) {
2788 dsl_dataset_name(ds, buf);
2789 dsl_dataset_rele(ds, FTAG);
2790 }
2791 dsl_pool_rele(dp, FTAG);
2792
2793 return (error);
2794}
2795
2796int
2797dsl_dataset_check_quota(dsl_dataset_t *ds, boolean_t check_quota,
2798 uint64_t asize, uint64_t inflight, uint64_t *used, uint64_t *ref_rsrv)
2799{
2800 int error = 0;
2801
2802 ASSERT3S(asize, >, 0);
2803
2804 /*
2805 * *ref_rsrv is the portion of asize that will come from any
2806 * unconsumed refreservation space.
2807 */
2808 *ref_rsrv = 0;
2809
2810 mutex_enter(&ds->ds_lock);
2811 /*
2812 * Make a space adjustment for reserved bytes.
2813 */
2814 if (ds->ds_reserved > ds->ds_phys->ds_unique_bytes) {
2815 ASSERT3U(*used, >=,
2816 ds->ds_reserved - ds->ds_phys->ds_unique_bytes);
2817 *used -= (ds->ds_reserved - ds->ds_phys->ds_unique_bytes);
2818 *ref_rsrv =
2819 asize - MIN(asize, parent_delta(ds, asize + inflight));
2820 }
2821
2822 if (!check_quota || ds->ds_quota == 0) {
2823 mutex_exit(&ds->ds_lock);
2824 return (0);
2825 }
2826 /*
2827 * If they are requesting more space, and our current estimate
2828 * is over quota, they get to try again unless the actual
2829 * on-disk is over quota and there are no pending changes (which
2830 * may free up space for us).
2831 */
2832 if (ds->ds_phys->ds_referenced_bytes + inflight >= ds->ds_quota) {
2833 if (inflight > 0 ||
2834 ds->ds_phys->ds_referenced_bytes < ds->ds_quota)
2835 error = SET_ERROR(ERESTART);
2836 else
2837 error = SET_ERROR(EDQUOT);
2838 }
2839 mutex_exit(&ds->ds_lock);
2840
2841 return (error);
2842}
2843
2844typedef struct dsl_dataset_set_qr_arg {
2845 const char *ddsqra_name;
2846 zprop_source_t ddsqra_source;
2847 uint64_t ddsqra_value;
2848} dsl_dataset_set_qr_arg_t;
2849
2850
2851/* ARGSUSED */
2852static int
2853dsl_dataset_set_refquota_check(void *arg, dmu_tx_t *tx)
2854{
2855 dsl_dataset_set_qr_arg_t *ddsqra = arg;
2856 dsl_pool_t *dp = dmu_tx_pool(tx);
2857 dsl_dataset_t *ds;
2858 int error;
2859 uint64_t newval;
2860
2861 if (spa_version(dp->dp_spa) < SPA_VERSION_REFQUOTA)
2862 return (SET_ERROR(ENOTSUP));
2863
2864 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds);
2865 if (error != 0)
2866 return (error);
2867
2868 if (dsl_dataset_is_snapshot(ds)) {
2869 dsl_dataset_rele(ds, FTAG);
2870 return (SET_ERROR(EINVAL));
2871 }
2872
2873 error = dsl_prop_predict(ds->ds_dir,
2874 zfs_prop_to_name(ZFS_PROP_REFQUOTA),
2875 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval);
2876 if (error != 0) {
2877 dsl_dataset_rele(ds, FTAG);
2878 return (error);
2879 }
2880
2881 if (newval == 0) {
2882 dsl_dataset_rele(ds, FTAG);
2883 return (0);
2884 }
2885
2886 if (newval < ds->ds_phys->ds_referenced_bytes ||
2887 newval < ds->ds_reserved) {
2888 dsl_dataset_rele(ds, FTAG);
2889 return (SET_ERROR(ENOSPC));
2890 }
2891
2892 dsl_dataset_rele(ds, FTAG);
2893 return (0);
2894}
2895
2896static void
2897dsl_dataset_set_refquota_sync(void *arg, dmu_tx_t *tx)
2898{
2899 dsl_dataset_set_qr_arg_t *ddsqra = arg;
2900 dsl_pool_t *dp = dmu_tx_pool(tx);
2901 dsl_dataset_t *ds;
2902 uint64_t newval;
2903
2904 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds));
2905
2906 dsl_prop_set_sync_impl(ds,
2907 zfs_prop_to_name(ZFS_PROP_REFQUOTA),
2908 ddsqra->ddsqra_source, sizeof (ddsqra->ddsqra_value), 1,
2909 &ddsqra->ddsqra_value, tx);
2910
2911 VERIFY0(dsl_prop_get_int_ds(ds,
2912 zfs_prop_to_name(ZFS_PROP_REFQUOTA), &newval));
2913
2914 if (ds->ds_quota != newval) {
2915 dmu_buf_will_dirty(ds->ds_dbuf, tx);
2916 ds->ds_quota = newval;
2917 }
2918 dsl_dataset_rele(ds, FTAG);
2919}
2920
2921int
2922dsl_dataset_set_refquota(const char *dsname, zprop_source_t source,
2923 uint64_t refquota)
2924{
2925 dsl_dataset_set_qr_arg_t ddsqra;
2926
2927 ddsqra.ddsqra_name = dsname;
2928 ddsqra.ddsqra_source = source;
2929 ddsqra.ddsqra_value = refquota;
2930
2931 return (dsl_sync_task(dsname, dsl_dataset_set_refquota_check,
2932 dsl_dataset_set_refquota_sync, &ddsqra, 0, ZFS_SPACE_CHECK_NONE));
2933}
2934
2935static int
2936dsl_dataset_set_refreservation_check(void *arg, dmu_tx_t *tx)
2937{
2938 dsl_dataset_set_qr_arg_t *ddsqra = arg;
2939 dsl_pool_t *dp = dmu_tx_pool(tx);
2940 dsl_dataset_t *ds;
2941 int error;
2942 uint64_t newval, unique;
2943
2944 if (spa_version(dp->dp_spa) < SPA_VERSION_REFRESERVATION)
2945 return (SET_ERROR(ENOTSUP));
2946
2947 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds);
2948 if (error != 0)
2949 return (error);
2950
2951 if (dsl_dataset_is_snapshot(ds)) {
2952 dsl_dataset_rele(ds, FTAG);
2953 return (SET_ERROR(EINVAL));
2954 }
2955
2956 error = dsl_prop_predict(ds->ds_dir,
2957 zfs_prop_to_name(ZFS_PROP_REFRESERVATION),
2958 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval);
2959 if (error != 0) {
2960 dsl_dataset_rele(ds, FTAG);
2961 return (error);
2962 }
2963
2964 /*
2965 * If we are doing the preliminary check in open context, the
2966 * space estimates may be inaccurate.
2967 */
2968 if (!dmu_tx_is_syncing(tx)) {
2969 dsl_dataset_rele(ds, FTAG);
2970 return (0);
2971 }
2972
2973 mutex_enter(&ds->ds_lock);
2974 if (!DS_UNIQUE_IS_ACCURATE(ds))
2975 dsl_dataset_recalc_head_uniq(ds);
2976 unique = ds->ds_phys->ds_unique_bytes;
2977 mutex_exit(&ds->ds_lock);
2978
2979 if (MAX(unique, newval) > MAX(unique, ds->ds_reserved)) {
2980 uint64_t delta = MAX(unique, newval) -
2981 MAX(unique, ds->ds_reserved);
2982
2983 if (delta >
2984 dsl_dir_space_available(ds->ds_dir, NULL, 0, B_TRUE) ||
2985 (ds->ds_quota > 0 && newval > ds->ds_quota)) {
2986 dsl_dataset_rele(ds, FTAG);
2987 return (SET_ERROR(ENOSPC));
2988 }
2989 }
2990
2991 dsl_dataset_rele(ds, FTAG);
2992 return (0);
2993}
2994
2995void
2996dsl_dataset_set_refreservation_sync_impl(dsl_dataset_t *ds,
2997 zprop_source_t source, uint64_t value, dmu_tx_t *tx)
2998{
2999 uint64_t newval;
3000 uint64_t unique;
3001 int64_t delta;
3002
3003 dsl_prop_set_sync_impl(ds, zfs_prop_to_name(ZFS_PROP_REFRESERVATION),
3004 source, sizeof (value), 1, &value, tx);
3005
3006 VERIFY0(dsl_prop_get_int_ds(ds,
3007 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), &newval));
3008
3009 dmu_buf_will_dirty(ds->ds_dbuf, tx);
3010 mutex_enter(&ds->ds_dir->dd_lock);
3011 mutex_enter(&ds->ds_lock);
3012 ASSERT(DS_UNIQUE_IS_ACCURATE(ds));
3013 unique = ds->ds_phys->ds_unique_bytes;
3014 delta = MAX(0, (int64_t)(newval - unique)) -
3015 MAX(0, (int64_t)(ds->ds_reserved - unique));
3016 ds->ds_reserved = newval;
3017 mutex_exit(&ds->ds_lock);
3018
3019 dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV, delta, 0, 0, tx);
3020 mutex_exit(&ds->ds_dir->dd_lock);
3021}
3022
3023static void
3024dsl_dataset_set_refreservation_sync(void *arg, dmu_tx_t *tx)
3025{
3026 dsl_dataset_set_qr_arg_t *ddsqra = arg;
3027 dsl_pool_t *dp = dmu_tx_pool(tx);
3028 dsl_dataset_t *ds;
3029
3030 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds));
3031 dsl_dataset_set_refreservation_sync_impl(ds,
3032 ddsqra->ddsqra_source, ddsqra->ddsqra_value, tx);
3033 dsl_dataset_rele(ds, FTAG);
3034}
3035
3036int
3037dsl_dataset_set_refreservation(const char *dsname, zprop_source_t source,
3038 uint64_t refreservation)
3039{
3040 dsl_dataset_set_qr_arg_t ddsqra;
3041
3042 ddsqra.ddsqra_name = dsname;
3043 ddsqra.ddsqra_source = source;
3044 ddsqra.ddsqra_value = refreservation;
3045
3046 return (dsl_sync_task(dsname, dsl_dataset_set_refreservation_check,
3047 dsl_dataset_set_refreservation_sync, &ddsqra,
3048 0, ZFS_SPACE_CHECK_NONE));
3049}
3050
3051/*
3052 * Return (in *usedp) the amount of space written in new that is not
3053 * present in oldsnap. New may be a snapshot or the head. Old must be
3054 * a snapshot before new, in new's filesystem (or its origin). If not then
3055 * fail and return EINVAL.
3056 *
3057 * The written space is calculated by considering two components: First, we
3058 * ignore any freed space, and calculate the written as new's used space
3059 * minus old's used space. Next, we add in the amount of space that was freed
3060 * between the two snapshots, thus reducing new's used space relative to old's.
3061 * Specifically, this is the space that was born before old->ds_creation_txg,
3062 * and freed before new (ie. on new's deadlist or a previous deadlist).
3063 *
3064 * space freed [---------------------]
3065 * snapshots ---O-------O--------O-------O------
3066 * oldsnap new
3067 */
3068int
3069dsl_dataset_space_written(dsl_dataset_t *oldsnap, dsl_dataset_t *new,
3070 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp)
3071{
3072 int err = 0;
3073 uint64_t snapobj;
3074 dsl_pool_t *dp = new->ds_dir->dd_pool;
3075
3076 ASSERT(dsl_pool_config_held(dp));
3077
3078 *usedp = 0;
3079 *usedp += new->ds_phys->ds_referenced_bytes;
3080 *usedp -= oldsnap->ds_phys->ds_referenced_bytes;
3081
3082 *compp = 0;
3083 *compp += new->ds_phys->ds_compressed_bytes;
3084 *compp -= oldsnap->ds_phys->ds_compressed_bytes;
3085
3086 *uncompp = 0;
3087 *uncompp += new->ds_phys->ds_uncompressed_bytes;
3088 *uncompp -= oldsnap->ds_phys->ds_uncompressed_bytes;
3089
3090 snapobj = new->ds_object;
3091 while (snapobj != oldsnap->ds_object) {
3092 dsl_dataset_t *snap;
3093 uint64_t used, comp, uncomp;
3094
3095 if (snapobj == new->ds_object) {
3096 snap = new;
3097 } else {
3098 err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &snap);
3099 if (err != 0)
3100 break;
3101 }
3102
3103 if (snap->ds_phys->ds_prev_snap_txg ==
3104 oldsnap->ds_phys->ds_creation_txg) {
3105 /*
3106 * The blocks in the deadlist can not be born after
3107 * ds_prev_snap_txg, so get the whole deadlist space,
3108 * which is more efficient (especially for old-format
3109 * deadlists). Unfortunately the deadlist code
3110 * doesn't have enough information to make this
3111 * optimization itself.
3112 */
3113 dsl_deadlist_space(&snap->ds_deadlist,
3114 &used, &comp, &uncomp);
3115 } else {
3116 dsl_deadlist_space_range(&snap->ds_deadlist,
3117 0, oldsnap->ds_phys->ds_creation_txg,
3118 &used, &comp, &uncomp);
3119 }
3120 *usedp += used;
3121 *compp += comp;
3122 *uncompp += uncomp;
3123
3124 /*
3125 * If we get to the beginning of the chain of snapshots
3126 * (ds_prev_snap_obj == 0) before oldsnap, then oldsnap
3127 * was not a snapshot of/before new.
3128 */
3129 snapobj = snap->ds_phys->ds_prev_snap_obj;
3130 if (snap != new)
3131 dsl_dataset_rele(snap, FTAG);
3132 if (snapobj == 0) {
3133 err = SET_ERROR(EINVAL);
3134 break;
3135 }
3136
3137 }
3138 return (err);
3139}
3140
3141/*
3142 * Return (in *usedp) the amount of space that will be reclaimed if firstsnap,
3143 * lastsnap, and all snapshots in between are deleted.
3144 *
3145 * blocks that would be freed [---------------------------]
3146 * snapshots ---O-------O--------O-------O--------O
3147 * firstsnap lastsnap
3148 *
3149 * This is the set of blocks that were born after the snap before firstsnap,
3150 * (birth > firstsnap->prev_snap_txg) and died before the snap after the
3151 * last snap (ie, is on lastsnap->ds_next->ds_deadlist or an earlier deadlist).
3152 * We calculate this by iterating over the relevant deadlists (from the snap
3153 * after lastsnap, backward to the snap after firstsnap), summing up the
3154 * space on the deadlist that was born after the snap before firstsnap.
3155 */
3156int
3157dsl_dataset_space_wouldfree(dsl_dataset_t *firstsnap,
3158 dsl_dataset_t *lastsnap,
3159 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp)
3160{
3161 int err = 0;
3162 uint64_t snapobj;
3163 dsl_pool_t *dp = firstsnap->ds_dir->dd_pool;
3164
3165 ASSERT(dsl_dataset_is_snapshot(firstsnap));
3166 ASSERT(dsl_dataset_is_snapshot(lastsnap));
3167
3168 /*
3169 * Check that the snapshots are in the same dsl_dir, and firstsnap
3170 * is before lastsnap.
3171 */
3172 if (firstsnap->ds_dir != lastsnap->ds_dir ||
3173 firstsnap->ds_phys->ds_creation_txg >
3174 lastsnap->ds_phys->ds_creation_txg)
3175 return (SET_ERROR(EINVAL));
3176
3177 *usedp = *compp = *uncompp = 0;
3178
3179 snapobj = lastsnap->ds_phys->ds_next_snap_obj;
3180 while (snapobj != firstsnap->ds_object) {
3181 dsl_dataset_t *ds;
3182 uint64_t used, comp, uncomp;
3183
3184 err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &ds);
3185 if (err != 0)
3186 break;
3187
3188 dsl_deadlist_space_range(&ds->ds_deadlist,
3189 firstsnap->ds_phys->ds_prev_snap_txg, UINT64_MAX,
3190 &used, &comp, &uncomp);
3191 *usedp += used;
3192 *compp += comp;
3193 *uncompp += uncomp;
3194
3195 snapobj = ds->ds_phys->ds_prev_snap_obj;
3196 ASSERT3U(snapobj, !=, 0);
3197 dsl_dataset_rele(ds, FTAG);
3198 }
3199 return (err);
3200}
3201
3202/*
3203 * Return TRUE if 'earlier' is an earlier snapshot in 'later's timeline.
3204 * For example, they could both be snapshots of the same filesystem, and
3205 * 'earlier' is before 'later'. Or 'earlier' could be the origin of
3206 * 'later's filesystem. Or 'earlier' could be an older snapshot in the origin's
3207 * filesystem. Or 'earlier' could be the origin's origin.
3208 *
3209 * If non-zero, earlier_txg is used instead of earlier's ds_creation_txg.
3210 */
3211boolean_t
3212dsl_dataset_is_before(dsl_dataset_t *later, dsl_dataset_t *earlier,
3213 uint64_t earlier_txg)
3214{
3215 dsl_pool_t *dp = later->ds_dir->dd_pool;
3216 int error;
3217 boolean_t ret;
3218
3219 ASSERT(dsl_pool_config_held(dp));
3220 ASSERT(dsl_dataset_is_snapshot(earlier) || earlier_txg != 0);
3221
3222 if (earlier_txg == 0)
3223 earlier_txg = earlier->ds_phys->ds_creation_txg;
3224
3225 if (dsl_dataset_is_snapshot(later) &&
3226 earlier_txg >= later->ds_phys->ds_creation_txg)
3227 return (B_FALSE);
3228
3229 if (later->ds_dir == earlier->ds_dir)
3230 return (B_TRUE);
3231 if (!dsl_dir_is_clone(later->ds_dir))
3232 return (B_FALSE);
3233
3234 if (later->ds_dir->dd_phys->dd_origin_obj == earlier->ds_object)
3235 return (B_TRUE);
3236 dsl_dataset_t *origin;
3237 error = dsl_dataset_hold_obj(dp,
3238 later->ds_dir->dd_phys->dd_origin_obj, FTAG, &origin);
3239 if (error != 0)
3240 return (B_FALSE);
3241 ret = dsl_dataset_is_before(origin, earlier, earlier_txg);
3242 dsl_dataset_rele(origin, FTAG);
3243 return (ret);
3244}
3245
3246
3247void
3248dsl_dataset_zapify(dsl_dataset_t *ds, dmu_tx_t *tx)
3249{
3250 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
3251 dmu_object_zapify(mos, ds->ds_object, DMU_OT_DSL_DATASET, tx);
3252}