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Illumos 5909 - ensure that shared snap names don't become too long after promotion
[mirror_zfs.git] / module / zfs / dsl_dataset.c
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 * Copyright (c) 2013 by Delphix. All rights reserved.
24 * Copyright (c) 2014, Joyent, Inc. All rights reserved.
25 * Copyright (c) 2014 RackTop Systems.
26 * Copyright (c) 2014 Spectra Logic Corporation, All rights reserved.
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 /*
55 * The SPA supports block sizes up to 16MB. However, very large blocks
56 * can have an impact on i/o latency (e.g. tying up a spinning disk for
57 * ~300ms), and also potentially on the memory allocator. Therefore,
58 * we do not allow the recordsize to be set larger than zfs_max_recordsize
59 * (default 1MB). Larger blocks can be created by changing this tunable,
60 * and pools with larger blocks can always be imported and used, regardless
61 * of this setting.
62 */
63 int zfs_max_recordsize = 1 * 1024 * 1024;
64
65 #define SWITCH64(x, y) \
66 { \
67 uint64_t __tmp = (x); \
68 (x) = (y); \
69 (y) = __tmp; \
70 }
71
72 #define DS_REF_MAX (1ULL << 62)
73
74 extern inline dsl_dataset_phys_t *dsl_dataset_phys(dsl_dataset_t *ds);
75
76 /*
77 * Figure out how much of this delta should be propogated to the dsl_dir
78 * layer. If there's a refreservation, that space has already been
79 * partially accounted for in our ancestors.
80 */
81 static int64_t
82 parent_delta(dsl_dataset_t *ds, int64_t delta)
83 {
84 dsl_dataset_phys_t *ds_phys;
85 uint64_t old_bytes, new_bytes;
86
87 if (ds->ds_reserved == 0)
88 return (delta);
89
90 ds_phys = dsl_dataset_phys(ds);
91 old_bytes = MAX(ds_phys->ds_unique_bytes, ds->ds_reserved);
92 new_bytes = MAX(ds_phys->ds_unique_bytes + delta, ds->ds_reserved);
93
94 ASSERT3U(ABS((int64_t)(new_bytes - old_bytes)), <=, ABS(delta));
95 return (new_bytes - old_bytes);
96 }
97
98 void
99 dsl_dataset_block_born(dsl_dataset_t *ds, const blkptr_t *bp, dmu_tx_t *tx)
100 {
101 int used, compressed, uncompressed;
102 int64_t delta;
103
104 used = bp_get_dsize_sync(tx->tx_pool->dp_spa, bp);
105 compressed = BP_GET_PSIZE(bp);
106 uncompressed = BP_GET_UCSIZE(bp);
107
108 dprintf_bp(bp, "ds=%p", ds);
109
110 ASSERT(dmu_tx_is_syncing(tx));
111 /* It could have been compressed away to nothing */
112 if (BP_IS_HOLE(bp))
113 return;
114 ASSERT(BP_GET_TYPE(bp) != DMU_OT_NONE);
115 ASSERT(DMU_OT_IS_VALID(BP_GET_TYPE(bp)));
116 if (ds == NULL) {
117 dsl_pool_mos_diduse_space(tx->tx_pool,
118 used, compressed, uncompressed);
119 return;
120 }
121
122 dmu_buf_will_dirty(ds->ds_dbuf, tx);
123 mutex_enter(&ds->ds_lock);
124 delta = parent_delta(ds, used);
125 dsl_dataset_phys(ds)->ds_referenced_bytes += used;
126 dsl_dataset_phys(ds)->ds_compressed_bytes += compressed;
127 dsl_dataset_phys(ds)->ds_uncompressed_bytes += uncompressed;
128 dsl_dataset_phys(ds)->ds_unique_bytes += used;
129 if (BP_GET_LSIZE(bp) > SPA_OLD_MAXBLOCKSIZE)
130 ds->ds_need_large_blocks = B_TRUE;
131 mutex_exit(&ds->ds_lock);
132 dsl_dir_diduse_space(ds->ds_dir, DD_USED_HEAD, delta,
133 compressed, uncompressed, tx);
134 dsl_dir_transfer_space(ds->ds_dir, used - delta,
135 DD_USED_REFRSRV, DD_USED_HEAD, tx);
136 }
137
138 int
139 dsl_dataset_block_kill(dsl_dataset_t *ds, const blkptr_t *bp, dmu_tx_t *tx,
140 boolean_t async)
141 {
142 int used = bp_get_dsize_sync(tx->tx_pool->dp_spa, bp);
143 int compressed = BP_GET_PSIZE(bp);
144 int uncompressed = BP_GET_UCSIZE(bp);
145
146 if (BP_IS_HOLE(bp))
147 return (0);
148
149 ASSERT(dmu_tx_is_syncing(tx));
150 ASSERT(bp->blk_birth <= tx->tx_txg);
151
152 if (ds == NULL) {
153 dsl_free(tx->tx_pool, tx->tx_txg, bp);
154 dsl_pool_mos_diduse_space(tx->tx_pool,
155 -used, -compressed, -uncompressed);
156 return (used);
157 }
158 ASSERT3P(tx->tx_pool, ==, ds->ds_dir->dd_pool);
159
160 ASSERT(!ds->ds_is_snapshot);
161 dmu_buf_will_dirty(ds->ds_dbuf, tx);
162
163 if (bp->blk_birth > dsl_dataset_phys(ds)->ds_prev_snap_txg) {
164 int64_t delta;
165
166 dprintf_bp(bp, "freeing ds=%llu", ds->ds_object);
167 dsl_free(tx->tx_pool, tx->tx_txg, bp);
168
169 mutex_enter(&ds->ds_lock);
170 ASSERT(dsl_dataset_phys(ds)->ds_unique_bytes >= used ||
171 !DS_UNIQUE_IS_ACCURATE(ds));
172 delta = parent_delta(ds, -used);
173 dsl_dataset_phys(ds)->ds_unique_bytes -= used;
174 mutex_exit(&ds->ds_lock);
175 dsl_dir_diduse_space(ds->ds_dir, DD_USED_HEAD,
176 delta, -compressed, -uncompressed, tx);
177 dsl_dir_transfer_space(ds->ds_dir, -used - delta,
178 DD_USED_REFRSRV, DD_USED_HEAD, tx);
179 } else {
180 dprintf_bp(bp, "putting on dead list: %s", "");
181 if (async) {
182 /*
183 * We are here as part of zio's write done callback,
184 * which means we're a zio interrupt thread. We can't
185 * call dsl_deadlist_insert() now because it may block
186 * waiting for I/O. Instead, put bp on the deferred
187 * queue and let dsl_pool_sync() finish the job.
188 */
189 bplist_append(&ds->ds_pending_deadlist, bp);
190 } else {
191 dsl_deadlist_insert(&ds->ds_deadlist, bp, tx);
192 }
193 ASSERT3U(ds->ds_prev->ds_object, ==,
194 dsl_dataset_phys(ds)->ds_prev_snap_obj);
195 ASSERT(dsl_dataset_phys(ds->ds_prev)->ds_num_children > 0);
196 /* if (bp->blk_birth > prev prev snap txg) prev unique += bs */
197 if (dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj ==
198 ds->ds_object && bp->blk_birth >
199 dsl_dataset_phys(ds->ds_prev)->ds_prev_snap_txg) {
200 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx);
201 mutex_enter(&ds->ds_prev->ds_lock);
202 dsl_dataset_phys(ds->ds_prev)->ds_unique_bytes += used;
203 mutex_exit(&ds->ds_prev->ds_lock);
204 }
205 if (bp->blk_birth > ds->ds_dir->dd_origin_txg) {
206 dsl_dir_transfer_space(ds->ds_dir, used,
207 DD_USED_HEAD, DD_USED_SNAP, tx);
208 }
209 }
210 mutex_enter(&ds->ds_lock);
211 ASSERT3U(dsl_dataset_phys(ds)->ds_referenced_bytes, >=, used);
212 dsl_dataset_phys(ds)->ds_referenced_bytes -= used;
213 ASSERT3U(dsl_dataset_phys(ds)->ds_compressed_bytes, >=, compressed);
214 dsl_dataset_phys(ds)->ds_compressed_bytes -= compressed;
215 ASSERT3U(dsl_dataset_phys(ds)->ds_uncompressed_bytes, >=, uncompressed);
216 dsl_dataset_phys(ds)->ds_uncompressed_bytes -= uncompressed;
217 mutex_exit(&ds->ds_lock);
218
219 return (used);
220 }
221
222 uint64_t
223 dsl_dataset_prev_snap_txg(dsl_dataset_t *ds)
224 {
225 uint64_t trysnap = 0;
226
227 if (ds == NULL)
228 return (0);
229 /*
230 * The snapshot creation could fail, but that would cause an
231 * incorrect FALSE return, which would only result in an
232 * overestimation of the amount of space that an operation would
233 * consume, which is OK.
234 *
235 * There's also a small window where we could miss a pending
236 * snapshot, because we could set the sync task in the quiescing
237 * phase. So this should only be used as a guess.
238 */
239 if (ds->ds_trysnap_txg >
240 spa_last_synced_txg(ds->ds_dir->dd_pool->dp_spa))
241 trysnap = ds->ds_trysnap_txg;
242 return (MAX(dsl_dataset_phys(ds)->ds_prev_snap_txg, trysnap));
243 }
244
245 boolean_t
246 dsl_dataset_block_freeable(dsl_dataset_t *ds, const blkptr_t *bp,
247 uint64_t blk_birth)
248 {
249 if (blk_birth <= dsl_dataset_prev_snap_txg(ds) ||
250 (bp != NULL && BP_IS_HOLE(bp)))
251 return (B_FALSE);
252
253 ddt_prefetch(dsl_dataset_get_spa(ds), bp);
254
255 return (B_TRUE);
256 }
257
258 static void
259 dsl_dataset_evict(void *dbu)
260 {
261 dsl_dataset_t *ds = dbu;
262
263 ASSERT(ds->ds_owner == NULL);
264
265 ds->ds_dbuf = NULL;
266
267 unique_remove(ds->ds_fsid_guid);
268
269 if (ds->ds_objset != NULL)
270 dmu_objset_evict(ds->ds_objset);
271
272 if (ds->ds_prev) {
273 dsl_dataset_rele(ds->ds_prev, ds);
274 ds->ds_prev = NULL;
275 }
276
277 bplist_destroy(&ds->ds_pending_deadlist);
278 if (ds->ds_deadlist.dl_os != NULL)
279 dsl_deadlist_close(&ds->ds_deadlist);
280 if (ds->ds_dir)
281 dsl_dir_async_rele(ds->ds_dir, ds);
282
283 ASSERT(!list_link_active(&ds->ds_synced_link));
284
285 mutex_destroy(&ds->ds_lock);
286 mutex_destroy(&ds->ds_opening_lock);
287 mutex_destroy(&ds->ds_sendstream_lock);
288 refcount_destroy(&ds->ds_longholds);
289
290 kmem_free(ds, sizeof (dsl_dataset_t));
291 }
292
293 int
294 dsl_dataset_get_snapname(dsl_dataset_t *ds)
295 {
296 dsl_dataset_phys_t *headphys;
297 int err;
298 dmu_buf_t *headdbuf;
299 dsl_pool_t *dp = ds->ds_dir->dd_pool;
300 objset_t *mos = dp->dp_meta_objset;
301
302 if (ds->ds_snapname[0])
303 return (0);
304 if (dsl_dataset_phys(ds)->ds_next_snap_obj == 0)
305 return (0);
306
307 err = dmu_bonus_hold(mos, dsl_dir_phys(ds->ds_dir)->dd_head_dataset_obj,
308 FTAG, &headdbuf);
309 if (err != 0)
310 return (err);
311 headphys = headdbuf->db_data;
312 err = zap_value_search(dp->dp_meta_objset,
313 headphys->ds_snapnames_zapobj, ds->ds_object, 0, ds->ds_snapname);
314 dmu_buf_rele(headdbuf, FTAG);
315 return (err);
316 }
317
318 int
319 dsl_dataset_snap_lookup(dsl_dataset_t *ds, const char *name, uint64_t *value)
320 {
321 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
322 uint64_t snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj;
323 matchtype_t mt;
324 int err;
325
326 if (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_CI_DATASET)
327 mt = MT_FIRST;
328 else
329 mt = MT_EXACT;
330
331 err = zap_lookup_norm(mos, snapobj, name, 8, 1,
332 value, mt, NULL, 0, NULL);
333 if (err == ENOTSUP && mt == MT_FIRST)
334 err = zap_lookup(mos, snapobj, name, 8, 1, value);
335 return (err);
336 }
337
338 int
339 dsl_dataset_snap_remove(dsl_dataset_t *ds, const char *name, dmu_tx_t *tx,
340 boolean_t adj_cnt)
341 {
342 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
343 uint64_t snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj;
344 matchtype_t mt;
345 int err;
346
347 dsl_dir_snap_cmtime_update(ds->ds_dir);
348
349 if (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_CI_DATASET)
350 mt = MT_FIRST;
351 else
352 mt = MT_EXACT;
353
354 err = zap_remove_norm(mos, snapobj, name, mt, tx);
355 if (err == ENOTSUP && mt == MT_FIRST)
356 err = zap_remove(mos, snapobj, name, tx);
357
358 if (err == 0 && adj_cnt)
359 dsl_fs_ss_count_adjust(ds->ds_dir, -1,
360 DD_FIELD_SNAPSHOT_COUNT, tx);
361
362 return (err);
363 }
364
365 boolean_t
366 dsl_dataset_try_add_ref(dsl_pool_t *dp, dsl_dataset_t *ds, void *tag)
367 {
368 dmu_buf_t *dbuf = ds->ds_dbuf;
369 boolean_t result = B_FALSE;
370
371 if (dbuf != NULL && dmu_buf_try_add_ref(dbuf, dp->dp_meta_objset,
372 ds->ds_object, DMU_BONUS_BLKID, tag)) {
373
374 if (ds == dmu_buf_get_user(dbuf))
375 result = B_TRUE;
376 else
377 dmu_buf_rele(dbuf, tag);
378 }
379
380 return (result);
381 }
382
383 int
384 dsl_dataset_hold_obj(dsl_pool_t *dp, uint64_t dsobj, void *tag,
385 dsl_dataset_t **dsp)
386 {
387 objset_t *mos = dp->dp_meta_objset;
388 dmu_buf_t *dbuf;
389 dsl_dataset_t *ds;
390 int err;
391 dmu_object_info_t doi;
392
393 ASSERT(dsl_pool_config_held(dp));
394
395 err = dmu_bonus_hold(mos, dsobj, tag, &dbuf);
396 if (err != 0)
397 return (err);
398
399 /* Make sure dsobj has the correct object type. */
400 dmu_object_info_from_db(dbuf, &doi);
401 if (doi.doi_bonus_type != DMU_OT_DSL_DATASET) {
402 dmu_buf_rele(dbuf, tag);
403 return (SET_ERROR(EINVAL));
404 }
405
406 ds = dmu_buf_get_user(dbuf);
407 if (ds == NULL) {
408 dsl_dataset_t *winner = NULL;
409
410 ds = kmem_zalloc(sizeof (dsl_dataset_t), KM_SLEEP);
411 ds->ds_dbuf = dbuf;
412 ds->ds_object = dsobj;
413 ds->ds_is_snapshot = dsl_dataset_phys(ds)->ds_num_children != 0;
414 list_link_init(&ds->ds_synced_link);
415
416 mutex_init(&ds->ds_lock, NULL, MUTEX_DEFAULT, NULL);
417 mutex_init(&ds->ds_opening_lock, NULL, MUTEX_DEFAULT, NULL);
418 mutex_init(&ds->ds_sendstream_lock, NULL, MUTEX_DEFAULT, NULL);
419 refcount_create(&ds->ds_longholds);
420
421 bplist_create(&ds->ds_pending_deadlist);
422 dsl_deadlist_open(&ds->ds_deadlist,
423 mos, dsl_dataset_phys(ds)->ds_deadlist_obj);
424
425 list_create(&ds->ds_sendstreams, sizeof (dmu_sendarg_t),
426 offsetof(dmu_sendarg_t, dsa_link));
427
428 if (doi.doi_type == DMU_OTN_ZAP_METADATA) {
429 int zaperr = zap_contains(mos, dsobj,
430 DS_FIELD_LARGE_BLOCKS);
431 if (zaperr != ENOENT) {
432 VERIFY0(zaperr);
433 ds->ds_large_blocks = B_TRUE;
434 }
435 }
436
437 if (err == 0) {
438 err = dsl_dir_hold_obj(dp,
439 dsl_dataset_phys(ds)->ds_dir_obj, NULL, ds,
440 &ds->ds_dir);
441 }
442 if (err != 0) {
443 mutex_destroy(&ds->ds_lock);
444 mutex_destroy(&ds->ds_opening_lock);
445 mutex_destroy(&ds->ds_sendstream_lock);
446 refcount_destroy(&ds->ds_longholds);
447 bplist_destroy(&ds->ds_pending_deadlist);
448 dsl_deadlist_close(&ds->ds_deadlist);
449 kmem_free(ds, sizeof (dsl_dataset_t));
450 dmu_buf_rele(dbuf, tag);
451 return (err);
452 }
453
454 if (!ds->ds_is_snapshot) {
455 ds->ds_snapname[0] = '\0';
456 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) {
457 err = dsl_dataset_hold_obj(dp,
458 dsl_dataset_phys(ds)->ds_prev_snap_obj,
459 ds, &ds->ds_prev);
460 }
461 if (doi.doi_type == DMU_OTN_ZAP_METADATA) {
462 int zaperr = zap_lookup(mos, ds->ds_object,
463 DS_FIELD_BOOKMARK_NAMES,
464 sizeof (ds->ds_bookmarks), 1,
465 &ds->ds_bookmarks);
466 if (zaperr != ENOENT)
467 VERIFY0(zaperr);
468 }
469 } else {
470 if (zfs_flags & ZFS_DEBUG_SNAPNAMES)
471 err = dsl_dataset_get_snapname(ds);
472 if (err == 0 &&
473 dsl_dataset_phys(ds)->ds_userrefs_obj != 0) {
474 err = zap_count(
475 ds->ds_dir->dd_pool->dp_meta_objset,
476 dsl_dataset_phys(ds)->ds_userrefs_obj,
477 &ds->ds_userrefs);
478 }
479 }
480
481 if (err == 0 && !ds->ds_is_snapshot) {
482 err = dsl_prop_get_int_ds(ds,
483 zfs_prop_to_name(ZFS_PROP_REFRESERVATION),
484 &ds->ds_reserved);
485 if (err == 0) {
486 err = dsl_prop_get_int_ds(ds,
487 zfs_prop_to_name(ZFS_PROP_REFQUOTA),
488 &ds->ds_quota);
489 }
490 } else {
491 ds->ds_reserved = ds->ds_quota = 0;
492 }
493
494 dmu_buf_init_user(&ds->ds_dbu, dsl_dataset_evict, &ds->ds_dbuf);
495 if (err == 0)
496 winner = dmu_buf_set_user_ie(dbuf, &ds->ds_dbu);
497
498 if (err != 0 || winner != NULL) {
499 bplist_destroy(&ds->ds_pending_deadlist);
500 dsl_deadlist_close(&ds->ds_deadlist);
501 if (ds->ds_prev)
502 dsl_dataset_rele(ds->ds_prev, ds);
503 dsl_dir_rele(ds->ds_dir, ds);
504 mutex_destroy(&ds->ds_lock);
505 mutex_destroy(&ds->ds_opening_lock);
506 mutex_destroy(&ds->ds_sendstream_lock);
507 refcount_destroy(&ds->ds_longholds);
508 kmem_free(ds, sizeof (dsl_dataset_t));
509 if (err != 0) {
510 dmu_buf_rele(dbuf, tag);
511 return (err);
512 }
513 ds = winner;
514 } else {
515 ds->ds_fsid_guid =
516 unique_insert(dsl_dataset_phys(ds)->ds_fsid_guid);
517 }
518 }
519 ASSERT3P(ds->ds_dbuf, ==, dbuf);
520 ASSERT3P(dsl_dataset_phys(ds), ==, dbuf->db_data);
521 ASSERT(dsl_dataset_phys(ds)->ds_prev_snap_obj != 0 ||
522 spa_version(dp->dp_spa) < SPA_VERSION_ORIGIN ||
523 dp->dp_origin_snap == NULL || ds == dp->dp_origin_snap);
524 *dsp = ds;
525 return (0);
526 }
527
528 int
529 dsl_dataset_hold(dsl_pool_t *dp, const char *name,
530 void *tag, dsl_dataset_t **dsp)
531 {
532 dsl_dir_t *dd;
533 const char *snapname;
534 uint64_t obj;
535 int err = 0;
536
537 err = dsl_dir_hold(dp, name, FTAG, &dd, &snapname);
538 if (err != 0)
539 return (err);
540
541 ASSERT(dsl_pool_config_held(dp));
542 obj = dsl_dir_phys(dd)->dd_head_dataset_obj;
543 if (obj != 0)
544 err = dsl_dataset_hold_obj(dp, obj, tag, dsp);
545 else
546 err = SET_ERROR(ENOENT);
547
548 /* we may be looking for a snapshot */
549 if (err == 0 && snapname != NULL) {
550 dsl_dataset_t *ds;
551
552 if (*snapname++ != '@') {
553 dsl_dataset_rele(*dsp, tag);
554 dsl_dir_rele(dd, FTAG);
555 return (SET_ERROR(ENOENT));
556 }
557
558 dprintf("looking for snapshot '%s'\n", snapname);
559 err = dsl_dataset_snap_lookup(*dsp, snapname, &obj);
560 if (err == 0)
561 err = dsl_dataset_hold_obj(dp, obj, tag, &ds);
562 dsl_dataset_rele(*dsp, tag);
563
564 if (err == 0) {
565 mutex_enter(&ds->ds_lock);
566 if (ds->ds_snapname[0] == 0)
567 (void) strlcpy(ds->ds_snapname, snapname,
568 sizeof (ds->ds_snapname));
569 mutex_exit(&ds->ds_lock);
570 *dsp = ds;
571 }
572 }
573
574 dsl_dir_rele(dd, FTAG);
575 return (err);
576 }
577
578 int
579 dsl_dataset_own_obj(dsl_pool_t *dp, uint64_t dsobj,
580 void *tag, dsl_dataset_t **dsp)
581 {
582 int err = dsl_dataset_hold_obj(dp, dsobj, tag, dsp);
583 if (err != 0)
584 return (err);
585 if (!dsl_dataset_tryown(*dsp, tag)) {
586 dsl_dataset_rele(*dsp, tag);
587 *dsp = NULL;
588 return (SET_ERROR(EBUSY));
589 }
590 return (0);
591 }
592
593 int
594 dsl_dataset_own(dsl_pool_t *dp, const char *name,
595 void *tag, dsl_dataset_t **dsp)
596 {
597 int err = dsl_dataset_hold(dp, name, tag, dsp);
598 if (err != 0)
599 return (err);
600 if (!dsl_dataset_tryown(*dsp, tag)) {
601 dsl_dataset_rele(*dsp, tag);
602 return (SET_ERROR(EBUSY));
603 }
604 return (0);
605 }
606
607 /*
608 * See the comment above dsl_pool_hold() for details. In summary, a long
609 * hold is used to prevent destruction of a dataset while the pool hold
610 * is dropped, allowing other concurrent operations (e.g. spa_sync()).
611 *
612 * The dataset and pool must be held when this function is called. After it
613 * is called, the pool hold may be released while the dataset is still held
614 * and accessed.
615 */
616 void
617 dsl_dataset_long_hold(dsl_dataset_t *ds, void *tag)
618 {
619 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool));
620 (void) refcount_add(&ds->ds_longholds, tag);
621 }
622
623 void
624 dsl_dataset_long_rele(dsl_dataset_t *ds, void *tag)
625 {
626 (void) refcount_remove(&ds->ds_longholds, tag);
627 }
628
629 /* Return B_TRUE if there are any long holds on this dataset. */
630 boolean_t
631 dsl_dataset_long_held(dsl_dataset_t *ds)
632 {
633 return (!refcount_is_zero(&ds->ds_longholds));
634 }
635
636 void
637 dsl_dataset_name(dsl_dataset_t *ds, char *name)
638 {
639 if (ds == NULL) {
640 (void) strcpy(name, "mos");
641 } else {
642 dsl_dir_name(ds->ds_dir, name);
643 VERIFY0(dsl_dataset_get_snapname(ds));
644 if (ds->ds_snapname[0]) {
645 (void) strcat(name, "@");
646 /*
647 * We use a "recursive" mutex so that we
648 * can call dprintf_ds() with ds_lock held.
649 */
650 if (!MUTEX_HELD(&ds->ds_lock)) {
651 mutex_enter(&ds->ds_lock);
652 (void) strcat(name, ds->ds_snapname);
653 mutex_exit(&ds->ds_lock);
654 } else {
655 (void) strcat(name, ds->ds_snapname);
656 }
657 }
658 }
659 }
660
661 void
662 dsl_dataset_rele(dsl_dataset_t *ds, void *tag)
663 {
664 dmu_buf_rele(ds->ds_dbuf, tag);
665 }
666
667 void
668 dsl_dataset_disown(dsl_dataset_t *ds, void *tag)
669 {
670 ASSERT3P(ds->ds_owner, ==, tag);
671 ASSERT(ds->ds_dbuf != NULL);
672
673 mutex_enter(&ds->ds_lock);
674 ds->ds_owner = NULL;
675 mutex_exit(&ds->ds_lock);
676 dsl_dataset_long_rele(ds, tag);
677 dsl_dataset_rele(ds, tag);
678 }
679
680 boolean_t
681 dsl_dataset_tryown(dsl_dataset_t *ds, void *tag)
682 {
683 boolean_t gotit = FALSE;
684
685 mutex_enter(&ds->ds_lock);
686 if (ds->ds_owner == NULL && !DS_IS_INCONSISTENT(ds)) {
687 ds->ds_owner = tag;
688 dsl_dataset_long_hold(ds, tag);
689 gotit = TRUE;
690 }
691 mutex_exit(&ds->ds_lock);
692 return (gotit);
693 }
694
695 uint64_t
696 dsl_dataset_create_sync_dd(dsl_dir_t *dd, dsl_dataset_t *origin,
697 uint64_t flags, dmu_tx_t *tx)
698 {
699 dsl_pool_t *dp = dd->dd_pool;
700 dmu_buf_t *dbuf;
701 dsl_dataset_phys_t *dsphys;
702 uint64_t dsobj;
703 objset_t *mos = dp->dp_meta_objset;
704
705 if (origin == NULL)
706 origin = dp->dp_origin_snap;
707
708 ASSERT(origin == NULL || origin->ds_dir->dd_pool == dp);
709 ASSERT(origin == NULL || dsl_dataset_phys(origin)->ds_num_children > 0);
710 ASSERT(dmu_tx_is_syncing(tx));
711 ASSERT(dsl_dir_phys(dd)->dd_head_dataset_obj == 0);
712
713 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0,
714 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx);
715 VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf));
716 dmu_buf_will_dirty(dbuf, tx);
717 dsphys = dbuf->db_data;
718 bzero(dsphys, sizeof (dsl_dataset_phys_t));
719 dsphys->ds_dir_obj = dd->dd_object;
720 dsphys->ds_flags = flags;
721 dsphys->ds_fsid_guid = unique_create();
722 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid,
723 sizeof (dsphys->ds_guid));
724 dsphys->ds_snapnames_zapobj =
725 zap_create_norm(mos, U8_TEXTPREP_TOUPPER, DMU_OT_DSL_DS_SNAP_MAP,
726 DMU_OT_NONE, 0, tx);
727 dsphys->ds_creation_time = gethrestime_sec();
728 dsphys->ds_creation_txg = tx->tx_txg == TXG_INITIAL ? 1 : tx->tx_txg;
729
730 if (origin == NULL) {
731 dsphys->ds_deadlist_obj = dsl_deadlist_alloc(mos, tx);
732 } else {
733 dsl_dataset_t *ohds; /* head of the origin snapshot */
734
735 dsphys->ds_prev_snap_obj = origin->ds_object;
736 dsphys->ds_prev_snap_txg =
737 dsl_dataset_phys(origin)->ds_creation_txg;
738 dsphys->ds_referenced_bytes =
739 dsl_dataset_phys(origin)->ds_referenced_bytes;
740 dsphys->ds_compressed_bytes =
741 dsl_dataset_phys(origin)->ds_compressed_bytes;
742 dsphys->ds_uncompressed_bytes =
743 dsl_dataset_phys(origin)->ds_uncompressed_bytes;
744 dsphys->ds_bp = dsl_dataset_phys(origin)->ds_bp;
745
746 /*
747 * Inherit flags that describe the dataset's contents
748 * (INCONSISTENT) or properties (Case Insensitive).
749 */
750 dsphys->ds_flags |= dsl_dataset_phys(origin)->ds_flags &
751 (DS_FLAG_INCONSISTENT | DS_FLAG_CI_DATASET);
752
753 if (origin->ds_large_blocks)
754 dsl_dataset_activate_large_blocks_sync_impl(dsobj, tx);
755
756 dmu_buf_will_dirty(origin->ds_dbuf, tx);
757 dsl_dataset_phys(origin)->ds_num_children++;
758
759 VERIFY0(dsl_dataset_hold_obj(dp,
760 dsl_dir_phys(origin->ds_dir)->dd_head_dataset_obj,
761 FTAG, &ohds));
762 dsphys->ds_deadlist_obj = dsl_deadlist_clone(&ohds->ds_deadlist,
763 dsphys->ds_prev_snap_txg, dsphys->ds_prev_snap_obj, tx);
764 dsl_dataset_rele(ohds, FTAG);
765
766 if (spa_version(dp->dp_spa) >= SPA_VERSION_NEXT_CLONES) {
767 if (dsl_dataset_phys(origin)->ds_next_clones_obj == 0) {
768 dsl_dataset_phys(origin)->ds_next_clones_obj =
769 zap_create(mos,
770 DMU_OT_NEXT_CLONES, DMU_OT_NONE, 0, tx);
771 }
772 VERIFY0(zap_add_int(mos,
773 dsl_dataset_phys(origin)->ds_next_clones_obj,
774 dsobj, tx));
775 }
776
777 dmu_buf_will_dirty(dd->dd_dbuf, tx);
778 dsl_dir_phys(dd)->dd_origin_obj = origin->ds_object;
779 if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) {
780 if (dsl_dir_phys(origin->ds_dir)->dd_clones == 0) {
781 dmu_buf_will_dirty(origin->ds_dir->dd_dbuf, tx);
782 dsl_dir_phys(origin->ds_dir)->dd_clones =
783 zap_create(mos,
784 DMU_OT_DSL_CLONES, DMU_OT_NONE, 0, tx);
785 }
786 VERIFY0(zap_add_int(mos,
787 dsl_dir_phys(origin->ds_dir)->dd_clones,
788 dsobj, tx));
789 }
790 }
791
792 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE)
793 dsphys->ds_flags |= DS_FLAG_UNIQUE_ACCURATE;
794
795 dmu_buf_rele(dbuf, FTAG);
796
797 dmu_buf_will_dirty(dd->dd_dbuf, tx);
798 dsl_dir_phys(dd)->dd_head_dataset_obj = dsobj;
799
800 return (dsobj);
801 }
802
803 static void
804 dsl_dataset_zero_zil(dsl_dataset_t *ds, dmu_tx_t *tx)
805 {
806 objset_t *os;
807
808 VERIFY0(dmu_objset_from_ds(ds, &os));
809 bzero(&os->os_zil_header, sizeof (os->os_zil_header));
810 dsl_dataset_dirty(ds, tx);
811 }
812
813 uint64_t
814 dsl_dataset_create_sync(dsl_dir_t *pdd, const char *lastname,
815 dsl_dataset_t *origin, uint64_t flags, cred_t *cr, dmu_tx_t *tx)
816 {
817 dsl_pool_t *dp = pdd->dd_pool;
818 uint64_t dsobj, ddobj;
819 dsl_dir_t *dd;
820
821 ASSERT(dmu_tx_is_syncing(tx));
822 ASSERT(lastname[0] != '@');
823
824 ddobj = dsl_dir_create_sync(dp, pdd, lastname, tx);
825 VERIFY0(dsl_dir_hold_obj(dp, ddobj, lastname, FTAG, &dd));
826
827 dsobj = dsl_dataset_create_sync_dd(dd, origin,
828 flags & ~DS_CREATE_FLAG_NODIRTY, tx);
829
830 dsl_deleg_set_create_perms(dd, tx, cr);
831
832 /*
833 * Since we're creating a new node we know it's a leaf, so we can
834 * initialize the counts if the limit feature is active.
835 */
836 if (spa_feature_is_active(dp->dp_spa, SPA_FEATURE_FS_SS_LIMIT)) {
837 uint64_t cnt = 0;
838 objset_t *os = dd->dd_pool->dp_meta_objset;
839
840 dsl_dir_zapify(dd, tx);
841 VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_FILESYSTEM_COUNT,
842 sizeof (cnt), 1, &cnt, tx));
843 VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_SNAPSHOT_COUNT,
844 sizeof (cnt), 1, &cnt, tx));
845 }
846
847 dsl_dir_rele(dd, FTAG);
848
849 /*
850 * If we are creating a clone, make sure we zero out any stale
851 * data from the origin snapshots zil header.
852 */
853 if (origin != NULL && !(flags & DS_CREATE_FLAG_NODIRTY)) {
854 dsl_dataset_t *ds;
855
856 VERIFY0(dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds));
857 dsl_dataset_zero_zil(ds, tx);
858 dsl_dataset_rele(ds, FTAG);
859 }
860
861 return (dsobj);
862 }
863
864 /*
865 * The unique space in the head dataset can be calculated by subtracting
866 * the space used in the most recent snapshot, that is still being used
867 * in this file system, from the space currently in use. To figure out
868 * the space in the most recent snapshot still in use, we need to take
869 * the total space used in the snapshot and subtract out the space that
870 * has been freed up since the snapshot was taken.
871 */
872 void
873 dsl_dataset_recalc_head_uniq(dsl_dataset_t *ds)
874 {
875 uint64_t mrs_used;
876 uint64_t dlused, dlcomp, dluncomp;
877
878 ASSERT(!ds->ds_is_snapshot);
879
880 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0)
881 mrs_used = dsl_dataset_phys(ds->ds_prev)->ds_referenced_bytes;
882 else
883 mrs_used = 0;
884
885 dsl_deadlist_space(&ds->ds_deadlist, &dlused, &dlcomp, &dluncomp);
886
887 ASSERT3U(dlused, <=, mrs_used);
888 dsl_dataset_phys(ds)->ds_unique_bytes =
889 dsl_dataset_phys(ds)->ds_referenced_bytes - (mrs_used - dlused);
890
891 if (spa_version(ds->ds_dir->dd_pool->dp_spa) >=
892 SPA_VERSION_UNIQUE_ACCURATE)
893 dsl_dataset_phys(ds)->ds_flags |= DS_FLAG_UNIQUE_ACCURATE;
894 }
895
896 void
897 dsl_dataset_remove_from_next_clones(dsl_dataset_t *ds, uint64_t obj,
898 dmu_tx_t *tx)
899 {
900 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
901 int err;
902 ASSERTV(uint64_t count);
903
904 ASSERT(dsl_dataset_phys(ds)->ds_num_children >= 2);
905 err = zap_remove_int(mos, dsl_dataset_phys(ds)->ds_next_clones_obj,
906 obj, tx);
907 /*
908 * The err should not be ENOENT, but a bug in a previous version
909 * of the code could cause upgrade_clones_cb() to not set
910 * ds_next_snap_obj when it should, leading to a missing entry.
911 * If we knew that the pool was created after
912 * SPA_VERSION_NEXT_CLONES, we could assert that it isn't
913 * ENOENT. However, at least we can check that we don't have
914 * too many entries in the next_clones_obj even after failing to
915 * remove this one.
916 */
917 if (err != ENOENT)
918 VERIFY0(err);
919 ASSERT0(zap_count(mos, dsl_dataset_phys(ds)->ds_next_clones_obj,
920 &count));
921 ASSERT3U(count, <=, dsl_dataset_phys(ds)->ds_num_children - 2);
922 }
923
924
925 blkptr_t *
926 dsl_dataset_get_blkptr(dsl_dataset_t *ds)
927 {
928 return (&dsl_dataset_phys(ds)->ds_bp);
929 }
930
931 void
932 dsl_dataset_set_blkptr(dsl_dataset_t *ds, blkptr_t *bp, dmu_tx_t *tx)
933 {
934 ASSERT(dmu_tx_is_syncing(tx));
935 /* If it's the meta-objset, set dp_meta_rootbp */
936 if (ds == NULL) {
937 tx->tx_pool->dp_meta_rootbp = *bp;
938 } else {
939 dmu_buf_will_dirty(ds->ds_dbuf, tx);
940 dsl_dataset_phys(ds)->ds_bp = *bp;
941 }
942 }
943
944 spa_t *
945 dsl_dataset_get_spa(dsl_dataset_t *ds)
946 {
947 return (ds->ds_dir->dd_pool->dp_spa);
948 }
949
950 void
951 dsl_dataset_dirty(dsl_dataset_t *ds, dmu_tx_t *tx)
952 {
953 dsl_pool_t *dp;
954
955 if (ds == NULL) /* this is the meta-objset */
956 return;
957
958 ASSERT(ds->ds_objset != NULL);
959
960 if (dsl_dataset_phys(ds)->ds_next_snap_obj != 0)
961 panic("dirtying snapshot!");
962
963 dp = ds->ds_dir->dd_pool;
964
965 if (txg_list_add(&dp->dp_dirty_datasets, ds, tx->tx_txg)) {
966 /* up the hold count until we can be written out */
967 dmu_buf_add_ref(ds->ds_dbuf, ds);
968 }
969 }
970
971 boolean_t
972 dsl_dataset_is_dirty(dsl_dataset_t *ds)
973 {
974 int t;
975
976 for (t = 0; t < TXG_SIZE; t++) {
977 if (txg_list_member(&ds->ds_dir->dd_pool->dp_dirty_datasets,
978 ds, t))
979 return (B_TRUE);
980 }
981 return (B_FALSE);
982 }
983
984 static int
985 dsl_dataset_snapshot_reserve_space(dsl_dataset_t *ds, dmu_tx_t *tx)
986 {
987 uint64_t asize;
988
989 if (!dmu_tx_is_syncing(tx))
990 return (0);
991
992 /*
993 * If there's an fs-only reservation, any blocks that might become
994 * owned by the snapshot dataset must be accommodated by space
995 * outside of the reservation.
996 */
997 ASSERT(ds->ds_reserved == 0 || DS_UNIQUE_IS_ACCURATE(ds));
998 asize = MIN(dsl_dataset_phys(ds)->ds_unique_bytes, ds->ds_reserved);
999 if (asize > dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE))
1000 return (SET_ERROR(ENOSPC));
1001
1002 /*
1003 * Propagate any reserved space for this snapshot to other
1004 * snapshot checks in this sync group.
1005 */
1006 if (asize > 0)
1007 dsl_dir_willuse_space(ds->ds_dir, asize, tx);
1008
1009 return (0);
1010 }
1011
1012 typedef struct dsl_dataset_snapshot_arg {
1013 nvlist_t *ddsa_snaps;
1014 nvlist_t *ddsa_props;
1015 nvlist_t *ddsa_errors;
1016 cred_t *ddsa_cr;
1017 } dsl_dataset_snapshot_arg_t;
1018
1019 int
1020 dsl_dataset_snapshot_check_impl(dsl_dataset_t *ds, const char *snapname,
1021 dmu_tx_t *tx, boolean_t recv, uint64_t cnt, cred_t *cr)
1022 {
1023 int error;
1024 uint64_t value;
1025
1026 ds->ds_trysnap_txg = tx->tx_txg;
1027
1028 if (!dmu_tx_is_syncing(tx))
1029 return (0);
1030
1031 /*
1032 * We don't allow multiple snapshots of the same txg. If there
1033 * is already one, try again.
1034 */
1035 if (dsl_dataset_phys(ds)->ds_prev_snap_txg >= tx->tx_txg)
1036 return (SET_ERROR(EAGAIN));
1037
1038 /*
1039 * Check for conflicting snapshot name.
1040 */
1041 error = dsl_dataset_snap_lookup(ds, snapname, &value);
1042 if (error == 0)
1043 return (SET_ERROR(EEXIST));
1044 if (error != ENOENT)
1045 return (error);
1046
1047 /*
1048 * We don't allow taking snapshots of inconsistent datasets, such as
1049 * those into which we are currently receiving. However, if we are
1050 * creating this snapshot as part of a receive, this check will be
1051 * executed atomically with respect to the completion of the receive
1052 * itself but prior to the clearing of DS_FLAG_INCONSISTENT; in this
1053 * case we ignore this, knowing it will be fixed up for us shortly in
1054 * dmu_recv_end_sync().
1055 */
1056 if (!recv && DS_IS_INCONSISTENT(ds))
1057 return (SET_ERROR(EBUSY));
1058
1059 /*
1060 * Skip the check for temporary snapshots or if we have already checked
1061 * the counts in dsl_dataset_snapshot_check. This means we really only
1062 * check the count here when we're receiving a stream.
1063 */
1064 if (cnt != 0 && cr != NULL) {
1065 error = dsl_fs_ss_limit_check(ds->ds_dir, cnt,
1066 ZFS_PROP_SNAPSHOT_LIMIT, NULL, cr);
1067 if (error != 0)
1068 return (error);
1069 }
1070
1071 error = dsl_dataset_snapshot_reserve_space(ds, tx);
1072 if (error != 0)
1073 return (error);
1074
1075 return (0);
1076 }
1077
1078 static int
1079 dsl_dataset_snapshot_check(void *arg, dmu_tx_t *tx)
1080 {
1081 dsl_dataset_snapshot_arg_t *ddsa = arg;
1082 dsl_pool_t *dp = dmu_tx_pool(tx);
1083 nvpair_t *pair;
1084 int rv = 0;
1085
1086 /*
1087 * Pre-compute how many total new snapshots will be created for each
1088 * level in the tree and below. This is needed for validating the
1089 * snapshot limit when either taking a recursive snapshot or when
1090 * taking multiple snapshots.
1091 *
1092 * The problem is that the counts are not actually adjusted when
1093 * we are checking, only when we finally sync. For a single snapshot,
1094 * this is easy, the count will increase by 1 at each node up the tree,
1095 * but its more complicated for the recursive/multiple snapshot case.
1096 *
1097 * The dsl_fs_ss_limit_check function does recursively check the count
1098 * at each level up the tree but since it is validating each snapshot
1099 * independently we need to be sure that we are validating the complete
1100 * count for the entire set of snapshots. We do this by rolling up the
1101 * counts for each component of the name into an nvlist and then
1102 * checking each of those cases with the aggregated count.
1103 *
1104 * This approach properly handles not only the recursive snapshot
1105 * case (where we get all of those on the ddsa_snaps list) but also
1106 * the sibling case (e.g. snapshot a/b and a/c so that we will also
1107 * validate the limit on 'a' using a count of 2).
1108 *
1109 * We validate the snapshot names in the third loop and only report
1110 * name errors once.
1111 */
1112 if (dmu_tx_is_syncing(tx)) {
1113 char *nm;
1114 nvlist_t *cnt_track = NULL;
1115 cnt_track = fnvlist_alloc();
1116
1117 nm = kmem_alloc(MAXPATHLEN, KM_SLEEP);
1118
1119 /* Rollup aggregated counts into the cnt_track list */
1120 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL);
1121 pair != NULL;
1122 pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) {
1123 char *pdelim;
1124 uint64_t val;
1125
1126 (void) strlcpy(nm, nvpair_name(pair), MAXPATHLEN);
1127 pdelim = strchr(nm, '@');
1128 if (pdelim == NULL)
1129 continue;
1130 *pdelim = '\0';
1131
1132 do {
1133 if (nvlist_lookup_uint64(cnt_track, nm,
1134 &val) == 0) {
1135 /* update existing entry */
1136 fnvlist_add_uint64(cnt_track, nm,
1137 val + 1);
1138 } else {
1139 /* add to list */
1140 fnvlist_add_uint64(cnt_track, nm, 1);
1141 }
1142
1143 pdelim = strrchr(nm, '/');
1144 if (pdelim != NULL)
1145 *pdelim = '\0';
1146 } while (pdelim != NULL);
1147 }
1148
1149 kmem_free(nm, MAXPATHLEN);
1150
1151 /* Check aggregated counts at each level */
1152 for (pair = nvlist_next_nvpair(cnt_track, NULL);
1153 pair != NULL; pair = nvlist_next_nvpair(cnt_track, pair)) {
1154 int error = 0;
1155 char *name;
1156 uint64_t cnt = 0;
1157 dsl_dataset_t *ds;
1158
1159 name = nvpair_name(pair);
1160 cnt = fnvpair_value_uint64(pair);
1161 ASSERT(cnt > 0);
1162
1163 error = dsl_dataset_hold(dp, name, FTAG, &ds);
1164 if (error == 0) {
1165 error = dsl_fs_ss_limit_check(ds->ds_dir, cnt,
1166 ZFS_PROP_SNAPSHOT_LIMIT, NULL,
1167 ddsa->ddsa_cr);
1168 dsl_dataset_rele(ds, FTAG);
1169 }
1170
1171 if (error != 0) {
1172 if (ddsa->ddsa_errors != NULL)
1173 fnvlist_add_int32(ddsa->ddsa_errors,
1174 name, error);
1175 rv = error;
1176 /* only report one error for this check */
1177 break;
1178 }
1179 }
1180 nvlist_free(cnt_track);
1181 }
1182
1183 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL);
1184 pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) {
1185 int error = 0;
1186 dsl_dataset_t *ds;
1187 char *name, *atp;
1188 char dsname[MAXNAMELEN];
1189
1190 name = nvpair_name(pair);
1191 if (strlen(name) >= MAXNAMELEN)
1192 error = SET_ERROR(ENAMETOOLONG);
1193 if (error == 0) {
1194 atp = strchr(name, '@');
1195 if (atp == NULL)
1196 error = SET_ERROR(EINVAL);
1197 if (error == 0)
1198 (void) strlcpy(dsname, name, atp - name + 1);
1199 }
1200 if (error == 0)
1201 error = dsl_dataset_hold(dp, dsname, FTAG, &ds);
1202 if (error == 0) {
1203 /* passing 0/NULL skips dsl_fs_ss_limit_check */
1204 error = dsl_dataset_snapshot_check_impl(ds,
1205 atp + 1, tx, B_FALSE, 0, NULL);
1206 dsl_dataset_rele(ds, FTAG);
1207 }
1208
1209 if (error != 0) {
1210 if (ddsa->ddsa_errors != NULL) {
1211 fnvlist_add_int32(ddsa->ddsa_errors,
1212 name, error);
1213 }
1214 rv = error;
1215 }
1216 }
1217
1218 return (rv);
1219 }
1220
1221 void
1222 dsl_dataset_snapshot_sync_impl(dsl_dataset_t *ds, const char *snapname,
1223 dmu_tx_t *tx)
1224 {
1225 dsl_pool_t *dp = ds->ds_dir->dd_pool;
1226 dmu_buf_t *dbuf;
1227 dsl_dataset_phys_t *dsphys;
1228 uint64_t dsobj, crtxg;
1229 objset_t *mos = dp->dp_meta_objset;
1230 ASSERTV(static zil_header_t zero_zil);
1231 ASSERTV(objset_t *os);
1232
1233 ASSERT(RRW_WRITE_HELD(&dp->dp_config_rwlock));
1234
1235 /*
1236 * If we are on an old pool, the zil must not be active, in which
1237 * case it will be zeroed. Usually zil_suspend() accomplishes this.
1238 */
1239 ASSERT(spa_version(dmu_tx_pool(tx)->dp_spa) >= SPA_VERSION_FAST_SNAP ||
1240 dmu_objset_from_ds(ds, &os) != 0 ||
1241 bcmp(&os->os_phys->os_zil_header, &zero_zil,
1242 sizeof (zero_zil)) == 0);
1243
1244 dsl_fs_ss_count_adjust(ds->ds_dir, 1, DD_FIELD_SNAPSHOT_COUNT, tx);
1245
1246 /*
1247 * The origin's ds_creation_txg has to be < TXG_INITIAL
1248 */
1249 if (strcmp(snapname, ORIGIN_DIR_NAME) == 0)
1250 crtxg = 1;
1251 else
1252 crtxg = tx->tx_txg;
1253
1254 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0,
1255 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx);
1256 VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf));
1257 dmu_buf_will_dirty(dbuf, tx);
1258 dsphys = dbuf->db_data;
1259 bzero(dsphys, sizeof (dsl_dataset_phys_t));
1260 dsphys->ds_dir_obj = ds->ds_dir->dd_object;
1261 dsphys->ds_fsid_guid = unique_create();
1262 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid,
1263 sizeof (dsphys->ds_guid));
1264 dsphys->ds_prev_snap_obj = dsl_dataset_phys(ds)->ds_prev_snap_obj;
1265 dsphys->ds_prev_snap_txg = dsl_dataset_phys(ds)->ds_prev_snap_txg;
1266 dsphys->ds_next_snap_obj = ds->ds_object;
1267 dsphys->ds_num_children = 1;
1268 dsphys->ds_creation_time = gethrestime_sec();
1269 dsphys->ds_creation_txg = crtxg;
1270 dsphys->ds_deadlist_obj = dsl_dataset_phys(ds)->ds_deadlist_obj;
1271 dsphys->ds_referenced_bytes = dsl_dataset_phys(ds)->ds_referenced_bytes;
1272 dsphys->ds_compressed_bytes = dsl_dataset_phys(ds)->ds_compressed_bytes;
1273 dsphys->ds_uncompressed_bytes =
1274 dsl_dataset_phys(ds)->ds_uncompressed_bytes;
1275 dsphys->ds_flags = dsl_dataset_phys(ds)->ds_flags;
1276 dsphys->ds_bp = dsl_dataset_phys(ds)->ds_bp;
1277 dmu_buf_rele(dbuf, FTAG);
1278
1279 if (ds->ds_large_blocks)
1280 dsl_dataset_activate_large_blocks_sync_impl(dsobj, tx);
1281
1282 ASSERT3U(ds->ds_prev != 0, ==,
1283 dsl_dataset_phys(ds)->ds_prev_snap_obj != 0);
1284 if (ds->ds_prev) {
1285 uint64_t next_clones_obj =
1286 dsl_dataset_phys(ds->ds_prev)->ds_next_clones_obj;
1287 ASSERT(dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj ==
1288 ds->ds_object ||
1289 dsl_dataset_phys(ds->ds_prev)->ds_num_children > 1);
1290 if (dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj ==
1291 ds->ds_object) {
1292 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx);
1293 ASSERT3U(dsl_dataset_phys(ds)->ds_prev_snap_txg, ==,
1294 dsl_dataset_phys(ds->ds_prev)->ds_creation_txg);
1295 dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj = dsobj;
1296 } else if (next_clones_obj != 0) {
1297 dsl_dataset_remove_from_next_clones(ds->ds_prev,
1298 dsphys->ds_next_snap_obj, tx);
1299 VERIFY0(zap_add_int(mos,
1300 next_clones_obj, dsobj, tx));
1301 }
1302 }
1303
1304 /*
1305 * If we have a reference-reservation on this dataset, we will
1306 * need to increase the amount of refreservation being charged
1307 * since our unique space is going to zero.
1308 */
1309 if (ds->ds_reserved) {
1310 int64_t delta;
1311 ASSERT(DS_UNIQUE_IS_ACCURATE(ds));
1312 delta = MIN(dsl_dataset_phys(ds)->ds_unique_bytes,
1313 ds->ds_reserved);
1314 dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV,
1315 delta, 0, 0, tx);
1316 }
1317
1318 dmu_buf_will_dirty(ds->ds_dbuf, tx);
1319 dsl_dataset_phys(ds)->ds_deadlist_obj =
1320 dsl_deadlist_clone(&ds->ds_deadlist, UINT64_MAX,
1321 dsl_dataset_phys(ds)->ds_prev_snap_obj, tx);
1322 dsl_deadlist_close(&ds->ds_deadlist);
1323 dsl_deadlist_open(&ds->ds_deadlist, mos,
1324 dsl_dataset_phys(ds)->ds_deadlist_obj);
1325 dsl_deadlist_add_key(&ds->ds_deadlist,
1326 dsl_dataset_phys(ds)->ds_prev_snap_txg, tx);
1327
1328 ASSERT3U(dsl_dataset_phys(ds)->ds_prev_snap_txg, <, tx->tx_txg);
1329 dsl_dataset_phys(ds)->ds_prev_snap_obj = dsobj;
1330 dsl_dataset_phys(ds)->ds_prev_snap_txg = crtxg;
1331 dsl_dataset_phys(ds)->ds_unique_bytes = 0;
1332 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE)
1333 dsl_dataset_phys(ds)->ds_flags |= DS_FLAG_UNIQUE_ACCURATE;
1334
1335 VERIFY0(zap_add(mos, dsl_dataset_phys(ds)->ds_snapnames_zapobj,
1336 snapname, 8, 1, &dsobj, tx));
1337
1338 if (ds->ds_prev)
1339 dsl_dataset_rele(ds->ds_prev, ds);
1340 VERIFY0(dsl_dataset_hold_obj(dp,
1341 dsl_dataset_phys(ds)->ds_prev_snap_obj, ds, &ds->ds_prev));
1342
1343 dsl_scan_ds_snapshotted(ds, tx);
1344
1345 dsl_dir_snap_cmtime_update(ds->ds_dir);
1346
1347 spa_history_log_internal_ds(ds->ds_prev, "snapshot", tx, "");
1348 }
1349
1350 static void
1351 dsl_dataset_snapshot_sync(void *arg, dmu_tx_t *tx)
1352 {
1353 dsl_dataset_snapshot_arg_t *ddsa = arg;
1354 dsl_pool_t *dp = dmu_tx_pool(tx);
1355 nvpair_t *pair;
1356
1357 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL);
1358 pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) {
1359 dsl_dataset_t *ds;
1360 char *name, *atp;
1361 char dsname[MAXNAMELEN];
1362
1363 name = nvpair_name(pair);
1364 atp = strchr(name, '@');
1365 (void) strlcpy(dsname, name, atp - name + 1);
1366 VERIFY0(dsl_dataset_hold(dp, dsname, FTAG, &ds));
1367
1368 dsl_dataset_snapshot_sync_impl(ds, atp + 1, tx);
1369 if (ddsa->ddsa_props != NULL) {
1370 dsl_props_set_sync_impl(ds->ds_prev,
1371 ZPROP_SRC_LOCAL, ddsa->ddsa_props, tx);
1372 }
1373 dsl_dataset_rele(ds, FTAG);
1374 }
1375 }
1376
1377 /*
1378 * The snapshots must all be in the same pool.
1379 * All-or-nothing: if there are any failures, nothing will be modified.
1380 */
1381 int
1382 dsl_dataset_snapshot(nvlist_t *snaps, nvlist_t *props, nvlist_t *errors)
1383 {
1384 dsl_dataset_snapshot_arg_t ddsa;
1385 nvpair_t *pair;
1386 boolean_t needsuspend;
1387 int error;
1388 spa_t *spa;
1389 char *firstname;
1390 nvlist_t *suspended = NULL;
1391
1392 pair = nvlist_next_nvpair(snaps, NULL);
1393 if (pair == NULL)
1394 return (0);
1395 firstname = nvpair_name(pair);
1396
1397 error = spa_open(firstname, &spa, FTAG);
1398 if (error != 0)
1399 return (error);
1400 needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP);
1401 spa_close(spa, FTAG);
1402
1403 if (needsuspend) {
1404 suspended = fnvlist_alloc();
1405 for (pair = nvlist_next_nvpair(snaps, NULL); pair != NULL;
1406 pair = nvlist_next_nvpair(snaps, pair)) {
1407 char fsname[MAXNAMELEN];
1408 char *snapname = nvpair_name(pair);
1409 char *atp;
1410 void *cookie;
1411
1412 atp = strchr(snapname, '@');
1413 if (atp == NULL) {
1414 error = SET_ERROR(EINVAL);
1415 break;
1416 }
1417 (void) strlcpy(fsname, snapname, atp - snapname + 1);
1418
1419 error = zil_suspend(fsname, &cookie);
1420 if (error != 0)
1421 break;
1422 fnvlist_add_uint64(suspended, fsname,
1423 (uintptr_t)cookie);
1424 }
1425 }
1426
1427 ddsa.ddsa_snaps = snaps;
1428 ddsa.ddsa_props = props;
1429 ddsa.ddsa_errors = errors;
1430 ddsa.ddsa_cr = CRED();
1431
1432 if (error == 0) {
1433 error = dsl_sync_task(firstname, dsl_dataset_snapshot_check,
1434 dsl_dataset_snapshot_sync, &ddsa,
1435 fnvlist_num_pairs(snaps) * 3, ZFS_SPACE_CHECK_NORMAL);
1436 }
1437
1438 if (suspended != NULL) {
1439 for (pair = nvlist_next_nvpair(suspended, NULL); pair != NULL;
1440 pair = nvlist_next_nvpair(suspended, pair)) {
1441 zil_resume((void *)(uintptr_t)
1442 fnvpair_value_uint64(pair));
1443 }
1444 fnvlist_free(suspended);
1445 }
1446
1447 #ifdef _KERNEL
1448 if (error == 0) {
1449 for (pair = nvlist_next_nvpair(snaps, NULL); pair != NULL;
1450 pair = nvlist_next_nvpair(snaps, pair)) {
1451 char *snapname = nvpair_name(pair);
1452 zvol_create_minors(snapname);
1453 }
1454 }
1455 #endif
1456
1457 return (error);
1458 }
1459
1460 typedef struct dsl_dataset_snapshot_tmp_arg {
1461 const char *ddsta_fsname;
1462 const char *ddsta_snapname;
1463 minor_t ddsta_cleanup_minor;
1464 const char *ddsta_htag;
1465 } dsl_dataset_snapshot_tmp_arg_t;
1466
1467 static int
1468 dsl_dataset_snapshot_tmp_check(void *arg, dmu_tx_t *tx)
1469 {
1470 dsl_dataset_snapshot_tmp_arg_t *ddsta = arg;
1471 dsl_pool_t *dp = dmu_tx_pool(tx);
1472 dsl_dataset_t *ds;
1473 int error;
1474
1475 error = dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds);
1476 if (error != 0)
1477 return (error);
1478
1479 /* NULL cred means no limit check for tmp snapshot */
1480 error = dsl_dataset_snapshot_check_impl(ds, ddsta->ddsta_snapname,
1481 tx, B_FALSE, 0, NULL);
1482 if (error != 0) {
1483 dsl_dataset_rele(ds, FTAG);
1484 return (error);
1485 }
1486
1487 if (spa_version(dp->dp_spa) < SPA_VERSION_USERREFS) {
1488 dsl_dataset_rele(ds, FTAG);
1489 return (SET_ERROR(ENOTSUP));
1490 }
1491 error = dsl_dataset_user_hold_check_one(NULL, ddsta->ddsta_htag,
1492 B_TRUE, tx);
1493 if (error != 0) {
1494 dsl_dataset_rele(ds, FTAG);
1495 return (error);
1496 }
1497
1498 dsl_dataset_rele(ds, FTAG);
1499 return (0);
1500 }
1501
1502 static void
1503 dsl_dataset_snapshot_tmp_sync(void *arg, dmu_tx_t *tx)
1504 {
1505 dsl_dataset_snapshot_tmp_arg_t *ddsta = arg;
1506 dsl_pool_t *dp = dmu_tx_pool(tx);
1507 dsl_dataset_t *ds;
1508
1509 VERIFY0(dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds));
1510
1511 dsl_dataset_snapshot_sync_impl(ds, ddsta->ddsta_snapname, tx);
1512 dsl_dataset_user_hold_sync_one(ds->ds_prev, ddsta->ddsta_htag,
1513 ddsta->ddsta_cleanup_minor, gethrestime_sec(), tx);
1514 dsl_destroy_snapshot_sync_impl(ds->ds_prev, B_TRUE, tx);
1515
1516 dsl_dataset_rele(ds, FTAG);
1517 }
1518
1519 int
1520 dsl_dataset_snapshot_tmp(const char *fsname, const char *snapname,
1521 minor_t cleanup_minor, const char *htag)
1522 {
1523 dsl_dataset_snapshot_tmp_arg_t ddsta;
1524 int error;
1525 spa_t *spa;
1526 boolean_t needsuspend;
1527 void *cookie;
1528
1529 ddsta.ddsta_fsname = fsname;
1530 ddsta.ddsta_snapname = snapname;
1531 ddsta.ddsta_cleanup_minor = cleanup_minor;
1532 ddsta.ddsta_htag = htag;
1533
1534 error = spa_open(fsname, &spa, FTAG);
1535 if (error != 0)
1536 return (error);
1537 needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP);
1538 spa_close(spa, FTAG);
1539
1540 if (needsuspend) {
1541 error = zil_suspend(fsname, &cookie);
1542 if (error != 0)
1543 return (error);
1544 }
1545
1546 error = dsl_sync_task(fsname, dsl_dataset_snapshot_tmp_check,
1547 dsl_dataset_snapshot_tmp_sync, &ddsta, 3, ZFS_SPACE_CHECK_RESERVED);
1548
1549 if (needsuspend)
1550 zil_resume(cookie);
1551 return (error);
1552 }
1553
1554
1555 void
1556 dsl_dataset_sync(dsl_dataset_t *ds, zio_t *zio, dmu_tx_t *tx)
1557 {
1558 ASSERT(dmu_tx_is_syncing(tx));
1559 ASSERT(ds->ds_objset != NULL);
1560 ASSERT(dsl_dataset_phys(ds)->ds_next_snap_obj == 0);
1561
1562 /*
1563 * in case we had to change ds_fsid_guid when we opened it,
1564 * sync it out now.
1565 */
1566 dmu_buf_will_dirty(ds->ds_dbuf, tx);
1567 dsl_dataset_phys(ds)->ds_fsid_guid = ds->ds_fsid_guid;
1568
1569 dmu_objset_sync(ds->ds_objset, zio, tx);
1570
1571 if (ds->ds_need_large_blocks && !ds->ds_large_blocks) {
1572 dsl_dataset_activate_large_blocks_sync_impl(ds->ds_object, tx);
1573 ds->ds_large_blocks = B_TRUE;
1574 }
1575 }
1576
1577 static void
1578 get_clones_stat(dsl_dataset_t *ds, nvlist_t *nv)
1579 {
1580 uint64_t count = 0;
1581 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
1582 zap_cursor_t zc;
1583 zap_attribute_t za;
1584 nvlist_t *propval = fnvlist_alloc();
1585 nvlist_t *val = fnvlist_alloc();
1586
1587 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool));
1588
1589 /*
1590 * There may be missing entries in ds_next_clones_obj
1591 * due to a bug in a previous version of the code.
1592 * Only trust it if it has the right number of entries.
1593 */
1594 if (dsl_dataset_phys(ds)->ds_next_clones_obj != 0) {
1595 VERIFY0(zap_count(mos, dsl_dataset_phys(ds)->ds_next_clones_obj,
1596 &count));
1597 }
1598 if (count != dsl_dataset_phys(ds)->ds_num_children - 1)
1599 goto fail;
1600 for (zap_cursor_init(&zc, mos,
1601 dsl_dataset_phys(ds)->ds_next_clones_obj);
1602 zap_cursor_retrieve(&zc, &za) == 0;
1603 zap_cursor_advance(&zc)) {
1604 dsl_dataset_t *clone;
1605 char buf[ZFS_MAXNAMELEN];
1606 VERIFY0(dsl_dataset_hold_obj(ds->ds_dir->dd_pool,
1607 za.za_first_integer, FTAG, &clone));
1608 dsl_dir_name(clone->ds_dir, buf);
1609 fnvlist_add_boolean(val, buf);
1610 dsl_dataset_rele(clone, FTAG);
1611 }
1612 zap_cursor_fini(&zc);
1613 fnvlist_add_nvlist(propval, ZPROP_VALUE, val);
1614 fnvlist_add_nvlist(nv, zfs_prop_to_name(ZFS_PROP_CLONES), propval);
1615 fail:
1616 nvlist_free(val);
1617 nvlist_free(propval);
1618 }
1619
1620 void
1621 dsl_dataset_stats(dsl_dataset_t *ds, nvlist_t *nv)
1622 {
1623 uint64_t refd, avail, uobjs, aobjs, ratio;
1624 ASSERTV(dsl_pool_t *dp = ds->ds_dir->dd_pool);
1625
1626 ASSERT(dsl_pool_config_held(dp));
1627
1628 ratio = dsl_dataset_phys(ds)->ds_compressed_bytes == 0 ? 100 :
1629 (dsl_dataset_phys(ds)->ds_uncompressed_bytes * 100 /
1630 dsl_dataset_phys(ds)->ds_compressed_bytes);
1631
1632 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRATIO, ratio);
1633 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_LOGICALREFERENCED,
1634 dsl_dataset_phys(ds)->ds_uncompressed_bytes);
1635
1636 if (ds->ds_is_snapshot) {
1637 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_COMPRESSRATIO, ratio);
1638 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USED,
1639 dsl_dataset_phys(ds)->ds_unique_bytes);
1640 get_clones_stat(ds, nv);
1641 } else {
1642 dsl_dir_stats(ds->ds_dir, nv);
1643 }
1644
1645 dsl_dataset_space(ds, &refd, &avail, &uobjs, &aobjs);
1646 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_AVAILABLE, avail);
1647 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFERENCED, refd);
1648
1649 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATION,
1650 dsl_dataset_phys(ds)->ds_creation_time);
1651 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATETXG,
1652 dsl_dataset_phys(ds)->ds_creation_txg);
1653 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFQUOTA,
1654 ds->ds_quota);
1655 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRESERVATION,
1656 ds->ds_reserved);
1657 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_GUID,
1658 dsl_dataset_phys(ds)->ds_guid);
1659 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_UNIQUE,
1660 dsl_dataset_phys(ds)->ds_unique_bytes);
1661 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_OBJSETID,
1662 ds->ds_object);
1663 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USERREFS,
1664 ds->ds_userrefs);
1665 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_DEFER_DESTROY,
1666 DS_IS_DEFER_DESTROY(ds) ? 1 : 0);
1667
1668 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) {
1669 uint64_t written, comp, uncomp;
1670 dsl_pool_t *dp = ds->ds_dir->dd_pool;
1671 dsl_dataset_t *prev;
1672 int err;
1673
1674 err = dsl_dataset_hold_obj(dp,
1675 dsl_dataset_phys(ds)->ds_prev_snap_obj, FTAG, &prev);
1676 if (err == 0) {
1677 err = dsl_dataset_space_written(prev, ds, &written,
1678 &comp, &uncomp);
1679 dsl_dataset_rele(prev, FTAG);
1680 if (err == 0) {
1681 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_WRITTEN,
1682 written);
1683 }
1684 }
1685 }
1686
1687 }
1688
1689 void
1690 dsl_dataset_fast_stat(dsl_dataset_t *ds, dmu_objset_stats_t *stat)
1691 {
1692 dsl_pool_t *dp = ds->ds_dir->dd_pool;
1693 ASSERT(dsl_pool_config_held(dp));
1694
1695 stat->dds_creation_txg = dsl_dataset_phys(ds)->ds_creation_txg;
1696 stat->dds_inconsistent =
1697 dsl_dataset_phys(ds)->ds_flags & DS_FLAG_INCONSISTENT;
1698 stat->dds_guid = dsl_dataset_phys(ds)->ds_guid;
1699 stat->dds_origin[0] = '\0';
1700 if (ds->ds_is_snapshot) {
1701 stat->dds_is_snapshot = B_TRUE;
1702 stat->dds_num_clones =
1703 dsl_dataset_phys(ds)->ds_num_children - 1;
1704 } else {
1705 stat->dds_is_snapshot = B_FALSE;
1706 stat->dds_num_clones = 0;
1707
1708 if (dsl_dir_is_clone(ds->ds_dir)) {
1709 dsl_dataset_t *ods;
1710
1711 VERIFY0(dsl_dataset_hold_obj(dp,
1712 dsl_dir_phys(ds->ds_dir)->dd_origin_obj,
1713 FTAG, &ods));
1714 dsl_dataset_name(ods, stat->dds_origin);
1715 dsl_dataset_rele(ods, FTAG);
1716 }
1717 }
1718 }
1719
1720 uint64_t
1721 dsl_dataset_fsid_guid(dsl_dataset_t *ds)
1722 {
1723 return (ds->ds_fsid_guid);
1724 }
1725
1726 void
1727 dsl_dataset_space(dsl_dataset_t *ds,
1728 uint64_t *refdbytesp, uint64_t *availbytesp,
1729 uint64_t *usedobjsp, uint64_t *availobjsp)
1730 {
1731 *refdbytesp = dsl_dataset_phys(ds)->ds_referenced_bytes;
1732 *availbytesp = dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE);
1733 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes)
1734 *availbytesp +=
1735 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes;
1736 if (ds->ds_quota != 0) {
1737 /*
1738 * Adjust available bytes according to refquota
1739 */
1740 if (*refdbytesp < ds->ds_quota)
1741 *availbytesp = MIN(*availbytesp,
1742 ds->ds_quota - *refdbytesp);
1743 else
1744 *availbytesp = 0;
1745 }
1746 *usedobjsp = BP_GET_FILL(&dsl_dataset_phys(ds)->ds_bp);
1747 *availobjsp = DN_MAX_OBJECT - *usedobjsp;
1748 }
1749
1750 boolean_t
1751 dsl_dataset_modified_since_snap(dsl_dataset_t *ds, dsl_dataset_t *snap)
1752 {
1753 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool));
1754 if (snap == NULL)
1755 return (B_FALSE);
1756 if (dsl_dataset_phys(ds)->ds_bp.blk_birth >
1757 dsl_dataset_phys(snap)->ds_creation_txg) {
1758 objset_t *os, *os_snap;
1759 /*
1760 * It may be that only the ZIL differs, because it was
1761 * reset in the head. Don't count that as being
1762 * modified.
1763 */
1764 if (dmu_objset_from_ds(ds, &os) != 0)
1765 return (B_TRUE);
1766 if (dmu_objset_from_ds(snap, &os_snap) != 0)
1767 return (B_TRUE);
1768 return (bcmp(&os->os_phys->os_meta_dnode,
1769 &os_snap->os_phys->os_meta_dnode,
1770 sizeof (os->os_phys->os_meta_dnode)) != 0);
1771 }
1772 return (B_FALSE);
1773 }
1774
1775 typedef struct dsl_dataset_rename_snapshot_arg {
1776 const char *ddrsa_fsname;
1777 const char *ddrsa_oldsnapname;
1778 const char *ddrsa_newsnapname;
1779 boolean_t ddrsa_recursive;
1780 dmu_tx_t *ddrsa_tx;
1781 } dsl_dataset_rename_snapshot_arg_t;
1782
1783 /* ARGSUSED */
1784 static int
1785 dsl_dataset_rename_snapshot_check_impl(dsl_pool_t *dp,
1786 dsl_dataset_t *hds, void *arg)
1787 {
1788 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg;
1789 int error;
1790 uint64_t val;
1791
1792 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val);
1793 if (error != 0) {
1794 /* ignore nonexistent snapshots */
1795 return (error == ENOENT ? 0 : error);
1796 }
1797
1798 /* new name should not exist */
1799 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_newsnapname, &val);
1800 if (error == 0)
1801 error = SET_ERROR(EEXIST);
1802 else if (error == ENOENT)
1803 error = 0;
1804
1805 /* dataset name + 1 for the "@" + the new snapshot name must fit */
1806 if (dsl_dir_namelen(hds->ds_dir) + 1 +
1807 strlen(ddrsa->ddrsa_newsnapname) >= MAXNAMELEN)
1808 error = SET_ERROR(ENAMETOOLONG);
1809
1810 return (error);
1811 }
1812
1813 static int
1814 dsl_dataset_rename_snapshot_check(void *arg, dmu_tx_t *tx)
1815 {
1816 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg;
1817 dsl_pool_t *dp = dmu_tx_pool(tx);
1818 dsl_dataset_t *hds;
1819 int error;
1820
1821 error = dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds);
1822 if (error != 0)
1823 return (error);
1824
1825 if (ddrsa->ddrsa_recursive) {
1826 error = dmu_objset_find_dp(dp, hds->ds_dir->dd_object,
1827 dsl_dataset_rename_snapshot_check_impl, ddrsa,
1828 DS_FIND_CHILDREN);
1829 } else {
1830 error = dsl_dataset_rename_snapshot_check_impl(dp, hds, ddrsa);
1831 }
1832 dsl_dataset_rele(hds, FTAG);
1833 return (error);
1834 }
1835
1836 static int
1837 dsl_dataset_rename_snapshot_sync_impl(dsl_pool_t *dp,
1838 dsl_dataset_t *hds, void *arg)
1839 {
1840 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg;
1841 dsl_dataset_t *ds;
1842 uint64_t val;
1843 dmu_tx_t *tx = ddrsa->ddrsa_tx;
1844 int error;
1845
1846 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val);
1847 ASSERT(error == 0 || error == ENOENT);
1848 if (error == ENOENT) {
1849 /* ignore nonexistent snapshots */
1850 return (0);
1851 }
1852
1853 VERIFY0(dsl_dataset_hold_obj(dp, val, FTAG, &ds));
1854
1855 /* log before we change the name */
1856 spa_history_log_internal_ds(ds, "rename", tx,
1857 "-> @%s", ddrsa->ddrsa_newsnapname);
1858
1859 VERIFY0(dsl_dataset_snap_remove(hds, ddrsa->ddrsa_oldsnapname, tx,
1860 B_FALSE));
1861 mutex_enter(&ds->ds_lock);
1862 (void) strcpy(ds->ds_snapname, ddrsa->ddrsa_newsnapname);
1863 mutex_exit(&ds->ds_lock);
1864 VERIFY0(zap_add(dp->dp_meta_objset,
1865 dsl_dataset_phys(hds)->ds_snapnames_zapobj,
1866 ds->ds_snapname, 8, 1, &ds->ds_object, tx));
1867
1868 dsl_dataset_rele(ds, FTAG);
1869 return (0);
1870 }
1871
1872 static void
1873 dsl_dataset_rename_snapshot_sync(void *arg, dmu_tx_t *tx)
1874 {
1875 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg;
1876 dsl_pool_t *dp = dmu_tx_pool(tx);
1877 dsl_dataset_t *hds;
1878
1879 VERIFY0(dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds));
1880 ddrsa->ddrsa_tx = tx;
1881 if (ddrsa->ddrsa_recursive) {
1882 VERIFY0(dmu_objset_find_dp(dp, hds->ds_dir->dd_object,
1883 dsl_dataset_rename_snapshot_sync_impl, ddrsa,
1884 DS_FIND_CHILDREN));
1885 } else {
1886 VERIFY0(dsl_dataset_rename_snapshot_sync_impl(dp, hds, ddrsa));
1887 }
1888 dsl_dataset_rele(hds, FTAG);
1889 }
1890
1891 int
1892 dsl_dataset_rename_snapshot(const char *fsname,
1893 const char *oldsnapname, const char *newsnapname, boolean_t recursive)
1894 {
1895 #ifdef _KERNEL
1896 char *oldname, *newname;
1897 #endif
1898 int error;
1899
1900 dsl_dataset_rename_snapshot_arg_t ddrsa;
1901
1902 ddrsa.ddrsa_fsname = fsname;
1903 ddrsa.ddrsa_oldsnapname = oldsnapname;
1904 ddrsa.ddrsa_newsnapname = newsnapname;
1905 ddrsa.ddrsa_recursive = recursive;
1906
1907 error = dsl_sync_task(fsname, dsl_dataset_rename_snapshot_check,
1908 dsl_dataset_rename_snapshot_sync, &ddrsa,
1909 1, ZFS_SPACE_CHECK_RESERVED);
1910
1911 if (error)
1912 return (SET_ERROR(error));
1913
1914 #ifdef _KERNEL
1915 oldname = kmem_asprintf("%s@%s", fsname, oldsnapname);
1916 newname = kmem_asprintf("%s@%s", fsname, newsnapname);
1917 zvol_rename_minors(oldname, newname);
1918 strfree(newname);
1919 strfree(oldname);
1920 #endif
1921
1922 return (0);
1923 }
1924
1925 /*
1926 * If we're doing an ownership handoff, we need to make sure that there is
1927 * only one long hold on the dataset. We're not allowed to change anything here
1928 * so we don't permanently release the long hold or regular hold here. We want
1929 * to do this only when syncing to avoid the dataset unexpectedly going away
1930 * when we release the long hold.
1931 */
1932 static int
1933 dsl_dataset_handoff_check(dsl_dataset_t *ds, void *owner, dmu_tx_t *tx)
1934 {
1935 boolean_t held;
1936
1937 if (!dmu_tx_is_syncing(tx))
1938 return (0);
1939
1940 if (owner != NULL) {
1941 VERIFY3P(ds->ds_owner, ==, owner);
1942 dsl_dataset_long_rele(ds, owner);
1943 }
1944
1945 held = dsl_dataset_long_held(ds);
1946
1947 if (owner != NULL)
1948 dsl_dataset_long_hold(ds, owner);
1949
1950 if (held)
1951 return (SET_ERROR(EBUSY));
1952
1953 return (0);
1954 }
1955
1956 typedef struct dsl_dataset_rollback_arg {
1957 const char *ddra_fsname;
1958 void *ddra_owner;
1959 nvlist_t *ddra_result;
1960 } dsl_dataset_rollback_arg_t;
1961
1962 static int
1963 dsl_dataset_rollback_check(void *arg, dmu_tx_t *tx)
1964 {
1965 dsl_dataset_rollback_arg_t *ddra = arg;
1966 dsl_pool_t *dp = dmu_tx_pool(tx);
1967 dsl_dataset_t *ds;
1968 int64_t unused_refres_delta;
1969 int error;
1970 nvpair_t *pair;
1971 nvlist_t *proprequest, *bookmarks;
1972
1973 error = dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds);
1974 if (error != 0)
1975 return (error);
1976
1977 /* must not be a snapshot */
1978 if (ds->ds_is_snapshot) {
1979 dsl_dataset_rele(ds, FTAG);
1980 return (SET_ERROR(EINVAL));
1981 }
1982
1983 /* must have a most recent snapshot */
1984 if (dsl_dataset_phys(ds)->ds_prev_snap_txg < TXG_INITIAL) {
1985 dsl_dataset_rele(ds, FTAG);
1986 return (SET_ERROR(EINVAL));
1987 }
1988
1989 /* must not have any bookmarks after the most recent snapshot */
1990 proprequest = fnvlist_alloc();
1991 fnvlist_add_boolean(proprequest, zfs_prop_to_name(ZFS_PROP_CREATETXG));
1992 bookmarks = fnvlist_alloc();
1993 error = dsl_get_bookmarks_impl(ds, proprequest, bookmarks);
1994 fnvlist_free(proprequest);
1995 if (error != 0)
1996 return (error);
1997 for (pair = nvlist_next_nvpair(bookmarks, NULL);
1998 pair != NULL; pair = nvlist_next_nvpair(bookmarks, pair)) {
1999 nvlist_t *valuenv =
2000 fnvlist_lookup_nvlist(fnvpair_value_nvlist(pair),
2001 zfs_prop_to_name(ZFS_PROP_CREATETXG));
2002 uint64_t createtxg = fnvlist_lookup_uint64(valuenv, "value");
2003 if (createtxg > dsl_dataset_phys(ds)->ds_prev_snap_txg) {
2004 fnvlist_free(bookmarks);
2005 dsl_dataset_rele(ds, FTAG);
2006 return (SET_ERROR(EEXIST));
2007 }
2008 }
2009 fnvlist_free(bookmarks);
2010
2011 error = dsl_dataset_handoff_check(ds, ddra->ddra_owner, tx);
2012 if (error != 0) {
2013 dsl_dataset_rele(ds, FTAG);
2014 return (error);
2015 }
2016
2017 /*
2018 * Check if the snap we are rolling back to uses more than
2019 * the refquota.
2020 */
2021 if (ds->ds_quota != 0 &&
2022 dsl_dataset_phys(ds->ds_prev)->ds_referenced_bytes > ds->ds_quota) {
2023 dsl_dataset_rele(ds, FTAG);
2024 return (SET_ERROR(EDQUOT));
2025 }
2026
2027 /*
2028 * When we do the clone swap, we will temporarily use more space
2029 * due to the refreservation (the head will no longer have any
2030 * unique space, so the entire amount of the refreservation will need
2031 * to be free). We will immediately destroy the clone, freeing
2032 * this space, but the freeing happens over many txg's.
2033 */
2034 unused_refres_delta = (int64_t)MIN(ds->ds_reserved,
2035 dsl_dataset_phys(ds)->ds_unique_bytes);
2036
2037 if (unused_refres_delta > 0 &&
2038 unused_refres_delta >
2039 dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE)) {
2040 dsl_dataset_rele(ds, FTAG);
2041 return (SET_ERROR(ENOSPC));
2042 }
2043
2044 dsl_dataset_rele(ds, FTAG);
2045 return (0);
2046 }
2047
2048 static void
2049 dsl_dataset_rollback_sync(void *arg, dmu_tx_t *tx)
2050 {
2051 dsl_dataset_rollback_arg_t *ddra = arg;
2052 dsl_pool_t *dp = dmu_tx_pool(tx);
2053 dsl_dataset_t *ds, *clone;
2054 uint64_t cloneobj;
2055 char namebuf[ZFS_MAXNAMELEN];
2056
2057 VERIFY0(dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds));
2058
2059 dsl_dataset_name(ds->ds_prev, namebuf);
2060 fnvlist_add_string(ddra->ddra_result, "target", namebuf);
2061
2062 cloneobj = dsl_dataset_create_sync(ds->ds_dir, "%rollback",
2063 ds->ds_prev, DS_CREATE_FLAG_NODIRTY, kcred, tx);
2064
2065 VERIFY0(dsl_dataset_hold_obj(dp, cloneobj, FTAG, &clone));
2066
2067 dsl_dataset_clone_swap_sync_impl(clone, ds, tx);
2068 dsl_dataset_zero_zil(ds, tx);
2069
2070 dsl_destroy_head_sync_impl(clone, tx);
2071
2072 dsl_dataset_rele(clone, FTAG);
2073 dsl_dataset_rele(ds, FTAG);
2074 }
2075
2076 /*
2077 * Rolls back the given filesystem or volume to the most recent snapshot.
2078 * The name of the most recent snapshot will be returned under key "target"
2079 * in the result nvlist.
2080 *
2081 * If owner != NULL:
2082 * - The existing dataset MUST be owned by the specified owner at entry
2083 * - Upon return, dataset will still be held by the same owner, whether we
2084 * succeed or not.
2085 *
2086 * This mode is required any time the existing filesystem is mounted. See
2087 * notes above zfs_suspend_fs() for further details.
2088 */
2089 int
2090 dsl_dataset_rollback(const char *fsname, void *owner, nvlist_t *result)
2091 {
2092 dsl_dataset_rollback_arg_t ddra;
2093
2094 ddra.ddra_fsname = fsname;
2095 ddra.ddra_owner = owner;
2096 ddra.ddra_result = result;
2097
2098 return (dsl_sync_task(fsname, dsl_dataset_rollback_check,
2099 dsl_dataset_rollback_sync, &ddra,
2100 1, ZFS_SPACE_CHECK_RESERVED));
2101 }
2102
2103 struct promotenode {
2104 list_node_t link;
2105 dsl_dataset_t *ds;
2106 };
2107
2108 typedef struct dsl_dataset_promote_arg {
2109 const char *ddpa_clonename;
2110 dsl_dataset_t *ddpa_clone;
2111 list_t shared_snaps, origin_snaps, clone_snaps;
2112 dsl_dataset_t *origin_origin; /* origin of the origin */
2113 uint64_t used, comp, uncomp, unique, cloneusedsnap, originusedsnap;
2114 char *err_ds;
2115 cred_t *cr;
2116 } dsl_dataset_promote_arg_t;
2117
2118 static int snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep);
2119 static int promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp,
2120 void *tag);
2121 static void promote_rele(dsl_dataset_promote_arg_t *ddpa, void *tag);
2122
2123 static int
2124 dsl_dataset_promote_check(void *arg, dmu_tx_t *tx)
2125 {
2126 dsl_dataset_promote_arg_t *ddpa = arg;
2127 dsl_pool_t *dp = dmu_tx_pool(tx);
2128 dsl_dataset_t *hds;
2129 struct promotenode *snap;
2130 dsl_dataset_t *origin_ds;
2131 int err;
2132 uint64_t unused;
2133 uint64_t ss_mv_cnt;
2134 size_t max_snap_len;
2135
2136 err = promote_hold(ddpa, dp, FTAG);
2137 if (err != 0)
2138 return (err);
2139
2140 hds = ddpa->ddpa_clone;
2141 max_snap_len = MAXNAMELEN - strlen(ddpa->ddpa_clonename) - 1;
2142
2143 if (dsl_dataset_phys(hds)->ds_flags & DS_FLAG_NOPROMOTE) {
2144 promote_rele(ddpa, FTAG);
2145 return (SET_ERROR(EXDEV));
2146 }
2147
2148 /*
2149 * Compute and check the amount of space to transfer. Since this is
2150 * so expensive, don't do the preliminary check.
2151 */
2152 if (!dmu_tx_is_syncing(tx)) {
2153 promote_rele(ddpa, FTAG);
2154 return (0);
2155 }
2156
2157 snap = list_head(&ddpa->shared_snaps);
2158 origin_ds = snap->ds;
2159
2160 /* compute origin's new unique space */
2161 snap = list_tail(&ddpa->clone_snaps);
2162 ASSERT3U(dsl_dataset_phys(snap->ds)->ds_prev_snap_obj, ==,
2163 origin_ds->ds_object);
2164 dsl_deadlist_space_range(&snap->ds->ds_deadlist,
2165 dsl_dataset_phys(origin_ds)->ds_prev_snap_txg, UINT64_MAX,
2166 &ddpa->unique, &unused, &unused);
2167
2168 /*
2169 * Walk the snapshots that we are moving
2170 *
2171 * Compute space to transfer. Consider the incremental changes
2172 * to used by each snapshot:
2173 * (my used) = (prev's used) + (blocks born) - (blocks killed)
2174 * So each snapshot gave birth to:
2175 * (blocks born) = (my used) - (prev's used) + (blocks killed)
2176 * So a sequence would look like:
2177 * (uN - u(N-1) + kN) + ... + (u1 - u0 + k1) + (u0 - 0 + k0)
2178 * Which simplifies to:
2179 * uN + kN + kN-1 + ... + k1 + k0
2180 * Note however, if we stop before we reach the ORIGIN we get:
2181 * uN + kN + kN-1 + ... + kM - uM-1
2182 */
2183 ss_mv_cnt = 0;
2184 ddpa->used = dsl_dataset_phys(origin_ds)->ds_referenced_bytes;
2185 ddpa->comp = dsl_dataset_phys(origin_ds)->ds_compressed_bytes;
2186 ddpa->uncomp = dsl_dataset_phys(origin_ds)->ds_uncompressed_bytes;
2187 for (snap = list_head(&ddpa->shared_snaps); snap;
2188 snap = list_next(&ddpa->shared_snaps, snap)) {
2189 uint64_t val, dlused, dlcomp, dluncomp;
2190 dsl_dataset_t *ds = snap->ds;
2191
2192 ss_mv_cnt++;
2193
2194 /*
2195 * If there are long holds, we won't be able to evict
2196 * the objset.
2197 */
2198 if (dsl_dataset_long_held(ds)) {
2199 err = SET_ERROR(EBUSY);
2200 goto out;
2201 }
2202
2203 /* Check that the snapshot name does not conflict */
2204 VERIFY0(dsl_dataset_get_snapname(ds));
2205 if (strlen(ds->ds_snapname) >= max_snap_len) {
2206 err = SET_ERROR(ENAMETOOLONG);
2207 goto out;
2208 }
2209 err = dsl_dataset_snap_lookup(hds, ds->ds_snapname, &val);
2210 if (err == 0) {
2211 (void) strcpy(ddpa->err_ds, snap->ds->ds_snapname);
2212 err = SET_ERROR(EEXIST);
2213 goto out;
2214 }
2215 if (err != ENOENT)
2216 goto out;
2217
2218 /* The very first snapshot does not have a deadlist */
2219 if (dsl_dataset_phys(ds)->ds_prev_snap_obj == 0)
2220 continue;
2221
2222 dsl_deadlist_space(&ds->ds_deadlist,
2223 &dlused, &dlcomp, &dluncomp);
2224 ddpa->used += dlused;
2225 ddpa->comp += dlcomp;
2226 ddpa->uncomp += dluncomp;
2227 }
2228
2229 /*
2230 * If we are a clone of a clone then we never reached ORIGIN,
2231 * so we need to subtract out the clone origin's used space.
2232 */
2233 if (ddpa->origin_origin) {
2234 ddpa->used -=
2235 dsl_dataset_phys(ddpa->origin_origin)->ds_referenced_bytes;
2236 ddpa->comp -=
2237 dsl_dataset_phys(ddpa->origin_origin)->ds_compressed_bytes;
2238 ddpa->uncomp -=
2239 dsl_dataset_phys(ddpa->origin_origin)->
2240 ds_uncompressed_bytes;
2241 }
2242
2243 /* Check that there is enough space and limit headroom here */
2244 err = dsl_dir_transfer_possible(origin_ds->ds_dir, hds->ds_dir,
2245 0, ss_mv_cnt, ddpa->used, ddpa->cr);
2246 if (err != 0)
2247 goto out;
2248
2249 /*
2250 * Compute the amounts of space that will be used by snapshots
2251 * after the promotion (for both origin and clone). For each,
2252 * it is the amount of space that will be on all of their
2253 * deadlists (that was not born before their new origin).
2254 */
2255 if (dsl_dir_phys(hds->ds_dir)->dd_flags & DD_FLAG_USED_BREAKDOWN) {
2256 uint64_t space;
2257
2258 /*
2259 * Note, typically this will not be a clone of a clone,
2260 * so dd_origin_txg will be < TXG_INITIAL, so
2261 * these snaplist_space() -> dsl_deadlist_space_range()
2262 * calls will be fast because they do not have to
2263 * iterate over all bps.
2264 */
2265 snap = list_head(&ddpa->origin_snaps);
2266 err = snaplist_space(&ddpa->shared_snaps,
2267 snap->ds->ds_dir->dd_origin_txg, &ddpa->cloneusedsnap);
2268 if (err != 0)
2269 goto out;
2270
2271 err = snaplist_space(&ddpa->clone_snaps,
2272 snap->ds->ds_dir->dd_origin_txg, &space);
2273 if (err != 0)
2274 goto out;
2275 ddpa->cloneusedsnap += space;
2276 }
2277 if (dsl_dir_phys(origin_ds->ds_dir)->dd_flags &
2278 DD_FLAG_USED_BREAKDOWN) {
2279 err = snaplist_space(&ddpa->origin_snaps,
2280 dsl_dataset_phys(origin_ds)->ds_creation_txg,
2281 &ddpa->originusedsnap);
2282 if (err != 0)
2283 goto out;
2284 }
2285
2286 out:
2287 promote_rele(ddpa, FTAG);
2288 return (err);
2289 }
2290
2291 static void
2292 dsl_dataset_promote_sync(void *arg, dmu_tx_t *tx)
2293 {
2294 dsl_dataset_promote_arg_t *ddpa = arg;
2295 dsl_pool_t *dp = dmu_tx_pool(tx);
2296 dsl_dataset_t *hds;
2297 struct promotenode *snap;
2298 dsl_dataset_t *origin_ds;
2299 dsl_dataset_t *origin_head;
2300 dsl_dir_t *dd;
2301 dsl_dir_t *odd = NULL;
2302 uint64_t oldnext_obj;
2303 int64_t delta;
2304
2305 VERIFY0(promote_hold(ddpa, dp, FTAG));
2306 hds = ddpa->ddpa_clone;
2307
2308 ASSERT0(dsl_dataset_phys(hds)->ds_flags & DS_FLAG_NOPROMOTE);
2309
2310 snap = list_head(&ddpa->shared_snaps);
2311 origin_ds = snap->ds;
2312 dd = hds->ds_dir;
2313
2314 snap = list_head(&ddpa->origin_snaps);
2315 origin_head = snap->ds;
2316
2317 /*
2318 * We need to explicitly open odd, since origin_ds's dd will be
2319 * changing.
2320 */
2321 VERIFY0(dsl_dir_hold_obj(dp, origin_ds->ds_dir->dd_object,
2322 NULL, FTAG, &odd));
2323
2324 /* change origin's next snap */
2325 dmu_buf_will_dirty(origin_ds->ds_dbuf, tx);
2326 oldnext_obj = dsl_dataset_phys(origin_ds)->ds_next_snap_obj;
2327 snap = list_tail(&ddpa->clone_snaps);
2328 ASSERT3U(dsl_dataset_phys(snap->ds)->ds_prev_snap_obj, ==,
2329 origin_ds->ds_object);
2330 dsl_dataset_phys(origin_ds)->ds_next_snap_obj = snap->ds->ds_object;
2331
2332 /* change the origin's next clone */
2333 if (dsl_dataset_phys(origin_ds)->ds_next_clones_obj) {
2334 dsl_dataset_remove_from_next_clones(origin_ds,
2335 snap->ds->ds_object, tx);
2336 VERIFY0(zap_add_int(dp->dp_meta_objset,
2337 dsl_dataset_phys(origin_ds)->ds_next_clones_obj,
2338 oldnext_obj, tx));
2339 }
2340
2341 /* change origin */
2342 dmu_buf_will_dirty(dd->dd_dbuf, tx);
2343 ASSERT3U(dsl_dir_phys(dd)->dd_origin_obj, ==, origin_ds->ds_object);
2344 dsl_dir_phys(dd)->dd_origin_obj = dsl_dir_phys(odd)->dd_origin_obj;
2345 dd->dd_origin_txg = origin_head->ds_dir->dd_origin_txg;
2346 dmu_buf_will_dirty(odd->dd_dbuf, tx);
2347 dsl_dir_phys(odd)->dd_origin_obj = origin_ds->ds_object;
2348 origin_head->ds_dir->dd_origin_txg =
2349 dsl_dataset_phys(origin_ds)->ds_creation_txg;
2350
2351 /* change dd_clone entries */
2352 if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) {
2353 VERIFY0(zap_remove_int(dp->dp_meta_objset,
2354 dsl_dir_phys(odd)->dd_clones, hds->ds_object, tx));
2355 VERIFY0(zap_add_int(dp->dp_meta_objset,
2356 dsl_dir_phys(ddpa->origin_origin->ds_dir)->dd_clones,
2357 hds->ds_object, tx));
2358
2359 VERIFY0(zap_remove_int(dp->dp_meta_objset,
2360 dsl_dir_phys(ddpa->origin_origin->ds_dir)->dd_clones,
2361 origin_head->ds_object, tx));
2362 if (dsl_dir_phys(dd)->dd_clones == 0) {
2363 dsl_dir_phys(dd)->dd_clones =
2364 zap_create(dp->dp_meta_objset, DMU_OT_DSL_CLONES,
2365 DMU_OT_NONE, 0, tx);
2366 }
2367 VERIFY0(zap_add_int(dp->dp_meta_objset,
2368 dsl_dir_phys(dd)->dd_clones, origin_head->ds_object, tx));
2369 }
2370
2371 /* move snapshots to this dir */
2372 for (snap = list_head(&ddpa->shared_snaps); snap;
2373 snap = list_next(&ddpa->shared_snaps, snap)) {
2374 dsl_dataset_t *ds = snap->ds;
2375
2376 /*
2377 * Property callbacks are registered to a particular
2378 * dsl_dir. Since ours is changing, evict the objset
2379 * so that they will be unregistered from the old dsl_dir.
2380 */
2381 if (ds->ds_objset) {
2382 dmu_objset_evict(ds->ds_objset);
2383 ds->ds_objset = NULL;
2384 }
2385
2386 /* move snap name entry */
2387 VERIFY0(dsl_dataset_get_snapname(ds));
2388 VERIFY0(dsl_dataset_snap_remove(origin_head,
2389 ds->ds_snapname, tx, B_TRUE));
2390 VERIFY0(zap_add(dp->dp_meta_objset,
2391 dsl_dataset_phys(hds)->ds_snapnames_zapobj, ds->ds_snapname,
2392 8, 1, &ds->ds_object, tx));
2393 dsl_fs_ss_count_adjust(hds->ds_dir, 1,
2394 DD_FIELD_SNAPSHOT_COUNT, tx);
2395
2396 /* change containing dsl_dir */
2397 dmu_buf_will_dirty(ds->ds_dbuf, tx);
2398 ASSERT3U(dsl_dataset_phys(ds)->ds_dir_obj, ==, odd->dd_object);
2399 dsl_dataset_phys(ds)->ds_dir_obj = dd->dd_object;
2400 ASSERT3P(ds->ds_dir, ==, odd);
2401 dsl_dir_rele(ds->ds_dir, ds);
2402 VERIFY0(dsl_dir_hold_obj(dp, dd->dd_object,
2403 NULL, ds, &ds->ds_dir));
2404
2405 /* move any clone references */
2406 if (dsl_dataset_phys(ds)->ds_next_clones_obj &&
2407 spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) {
2408 zap_cursor_t zc;
2409 zap_attribute_t za;
2410
2411 for (zap_cursor_init(&zc, dp->dp_meta_objset,
2412 dsl_dataset_phys(ds)->ds_next_clones_obj);
2413 zap_cursor_retrieve(&zc, &za) == 0;
2414 zap_cursor_advance(&zc)) {
2415 dsl_dataset_t *cnds;
2416 uint64_t o;
2417
2418 if (za.za_first_integer == oldnext_obj) {
2419 /*
2420 * We've already moved the
2421 * origin's reference.
2422 */
2423 continue;
2424 }
2425
2426 VERIFY0(dsl_dataset_hold_obj(dp,
2427 za.za_first_integer, FTAG, &cnds));
2428 o = dsl_dir_phys(cnds->ds_dir)->
2429 dd_head_dataset_obj;
2430
2431 VERIFY0(zap_remove_int(dp->dp_meta_objset,
2432 dsl_dir_phys(odd)->dd_clones, o, tx));
2433 VERIFY0(zap_add_int(dp->dp_meta_objset,
2434 dsl_dir_phys(dd)->dd_clones, o, tx));
2435 dsl_dataset_rele(cnds, FTAG);
2436 }
2437 zap_cursor_fini(&zc);
2438 }
2439
2440 ASSERT(!dsl_prop_hascb(ds));
2441 }
2442
2443 /*
2444 * Change space accounting.
2445 * Note, pa->*usedsnap and dd_used_breakdown[SNAP] will either
2446 * both be valid, or both be 0 (resulting in delta == 0). This
2447 * is true for each of {clone,origin} independently.
2448 */
2449
2450 delta = ddpa->cloneusedsnap -
2451 dsl_dir_phys(dd)->dd_used_breakdown[DD_USED_SNAP];
2452 ASSERT3S(delta, >=, 0);
2453 ASSERT3U(ddpa->used, >=, delta);
2454 dsl_dir_diduse_space(dd, DD_USED_SNAP, delta, 0, 0, tx);
2455 dsl_dir_diduse_space(dd, DD_USED_HEAD,
2456 ddpa->used - delta, ddpa->comp, ddpa->uncomp, tx);
2457
2458 delta = ddpa->originusedsnap -
2459 dsl_dir_phys(odd)->dd_used_breakdown[DD_USED_SNAP];
2460 ASSERT3S(delta, <=, 0);
2461 ASSERT3U(ddpa->used, >=, -delta);
2462 dsl_dir_diduse_space(odd, DD_USED_SNAP, delta, 0, 0, tx);
2463 dsl_dir_diduse_space(odd, DD_USED_HEAD,
2464 -ddpa->used - delta, -ddpa->comp, -ddpa->uncomp, tx);
2465
2466 dsl_dataset_phys(origin_ds)->ds_unique_bytes = ddpa->unique;
2467
2468 /* log history record */
2469 spa_history_log_internal_ds(hds, "promote", tx, "");
2470
2471 dsl_dir_rele(odd, FTAG);
2472 promote_rele(ddpa, FTAG);
2473 }
2474
2475 /*
2476 * Make a list of dsl_dataset_t's for the snapshots between first_obj
2477 * (exclusive) and last_obj (inclusive). The list will be in reverse
2478 * order (last_obj will be the list_head()). If first_obj == 0, do all
2479 * snapshots back to this dataset's origin.
2480 */
2481 static int
2482 snaplist_make(dsl_pool_t *dp,
2483 uint64_t first_obj, uint64_t last_obj, list_t *l, void *tag)
2484 {
2485 uint64_t obj = last_obj;
2486
2487 list_create(l, sizeof (struct promotenode),
2488 offsetof(struct promotenode, link));
2489
2490 while (obj != first_obj) {
2491 dsl_dataset_t *ds;
2492 struct promotenode *snap;
2493 int err;
2494
2495 err = dsl_dataset_hold_obj(dp, obj, tag, &ds);
2496 ASSERT(err != ENOENT);
2497 if (err != 0)
2498 return (err);
2499
2500 if (first_obj == 0)
2501 first_obj = dsl_dir_phys(ds->ds_dir)->dd_origin_obj;
2502
2503 snap = kmem_alloc(sizeof (*snap), KM_SLEEP);
2504 snap->ds = ds;
2505 list_insert_tail(l, snap);
2506 obj = dsl_dataset_phys(ds)->ds_prev_snap_obj;
2507 }
2508
2509 return (0);
2510 }
2511
2512 static int
2513 snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep)
2514 {
2515 struct promotenode *snap;
2516
2517 *spacep = 0;
2518 for (snap = list_head(l); snap; snap = list_next(l, snap)) {
2519 uint64_t used, comp, uncomp;
2520 dsl_deadlist_space_range(&snap->ds->ds_deadlist,
2521 mintxg, UINT64_MAX, &used, &comp, &uncomp);
2522 *spacep += used;
2523 }
2524 return (0);
2525 }
2526
2527 static void
2528 snaplist_destroy(list_t *l, void *tag)
2529 {
2530 struct promotenode *snap;
2531
2532 if (l == NULL || !list_link_active(&l->list_head))
2533 return;
2534
2535 while ((snap = list_tail(l)) != NULL) {
2536 list_remove(l, snap);
2537 dsl_dataset_rele(snap->ds, tag);
2538 kmem_free(snap, sizeof (*snap));
2539 }
2540 list_destroy(l);
2541 }
2542
2543 static int
2544 promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp, void *tag)
2545 {
2546 int error;
2547 dsl_dir_t *dd;
2548 struct promotenode *snap;
2549
2550 error = dsl_dataset_hold(dp, ddpa->ddpa_clonename, tag,
2551 &ddpa->ddpa_clone);
2552 if (error != 0)
2553 return (error);
2554 dd = ddpa->ddpa_clone->ds_dir;
2555
2556 if (ddpa->ddpa_clone->ds_is_snapshot ||
2557 !dsl_dir_is_clone(dd)) {
2558 dsl_dataset_rele(ddpa->ddpa_clone, tag);
2559 return (SET_ERROR(EINVAL));
2560 }
2561
2562 error = snaplist_make(dp, 0, dsl_dir_phys(dd)->dd_origin_obj,
2563 &ddpa->shared_snaps, tag);
2564 if (error != 0)
2565 goto out;
2566
2567 error = snaplist_make(dp, 0, ddpa->ddpa_clone->ds_object,
2568 &ddpa->clone_snaps, tag);
2569 if (error != 0)
2570 goto out;
2571
2572 snap = list_head(&ddpa->shared_snaps);
2573 ASSERT3U(snap->ds->ds_object, ==, dsl_dir_phys(dd)->dd_origin_obj);
2574 error = snaplist_make(dp, dsl_dir_phys(dd)->dd_origin_obj,
2575 dsl_dir_phys(snap->ds->ds_dir)->dd_head_dataset_obj,
2576 &ddpa->origin_snaps, tag);
2577 if (error != 0)
2578 goto out;
2579
2580 if (dsl_dir_phys(snap->ds->ds_dir)->dd_origin_obj != 0) {
2581 error = dsl_dataset_hold_obj(dp,
2582 dsl_dir_phys(snap->ds->ds_dir)->dd_origin_obj,
2583 tag, &ddpa->origin_origin);
2584 if (error != 0)
2585 goto out;
2586 }
2587 out:
2588 if (error != 0)
2589 promote_rele(ddpa, tag);
2590 return (error);
2591 }
2592
2593 static void
2594 promote_rele(dsl_dataset_promote_arg_t *ddpa, void *tag)
2595 {
2596 snaplist_destroy(&ddpa->shared_snaps, tag);
2597 snaplist_destroy(&ddpa->clone_snaps, tag);
2598 snaplist_destroy(&ddpa->origin_snaps, tag);
2599 if (ddpa->origin_origin != NULL)
2600 dsl_dataset_rele(ddpa->origin_origin, tag);
2601 dsl_dataset_rele(ddpa->ddpa_clone, tag);
2602 }
2603
2604 /*
2605 * Promote a clone.
2606 *
2607 * If it fails due to a conflicting snapshot name, "conflsnap" will be filled
2608 * in with the name. (It must be at least MAXNAMELEN bytes long.)
2609 */
2610 int
2611 dsl_dataset_promote(const char *name, char *conflsnap)
2612 {
2613 dsl_dataset_promote_arg_t ddpa = { 0 };
2614 uint64_t numsnaps;
2615 int error;
2616 objset_t *os;
2617
2618 /*
2619 * We will modify space proportional to the number of
2620 * snapshots. Compute numsnaps.
2621 */
2622 error = dmu_objset_hold(name, FTAG, &os);
2623 if (error != 0)
2624 return (error);
2625 error = zap_count(dmu_objset_pool(os)->dp_meta_objset,
2626 dsl_dataset_phys(dmu_objset_ds(os))->ds_snapnames_zapobj,
2627 &numsnaps);
2628 dmu_objset_rele(os, FTAG);
2629 if (error != 0)
2630 return (error);
2631
2632 ddpa.ddpa_clonename = name;
2633 ddpa.err_ds = conflsnap;
2634 ddpa.cr = CRED();
2635
2636 return (dsl_sync_task(name, dsl_dataset_promote_check,
2637 dsl_dataset_promote_sync, &ddpa,
2638 2 + numsnaps, ZFS_SPACE_CHECK_RESERVED));
2639 }
2640
2641 int
2642 dsl_dataset_clone_swap_check_impl(dsl_dataset_t *clone,
2643 dsl_dataset_t *origin_head, boolean_t force, void *owner, dmu_tx_t *tx)
2644 {
2645 int64_t unused_refres_delta;
2646
2647 /* they should both be heads */
2648 if (clone->ds_is_snapshot ||
2649 origin_head->ds_is_snapshot)
2650 return (SET_ERROR(EINVAL));
2651
2652 /* if we are not forcing, the branch point should be just before them */
2653 if (!force && clone->ds_prev != origin_head->ds_prev)
2654 return (SET_ERROR(EINVAL));
2655
2656 /* clone should be the clone (unless they are unrelated) */
2657 if (clone->ds_prev != NULL &&
2658 clone->ds_prev != clone->ds_dir->dd_pool->dp_origin_snap &&
2659 origin_head->ds_dir != clone->ds_prev->ds_dir)
2660 return (SET_ERROR(EINVAL));
2661
2662 /* the clone should be a child of the origin */
2663 if (clone->ds_dir->dd_parent != origin_head->ds_dir)
2664 return (SET_ERROR(EINVAL));
2665
2666 /* origin_head shouldn't be modified unless 'force' */
2667 if (!force &&
2668 dsl_dataset_modified_since_snap(origin_head, origin_head->ds_prev))
2669 return (SET_ERROR(ETXTBSY));
2670
2671 /* origin_head should have no long holds (e.g. is not mounted) */
2672 if (dsl_dataset_handoff_check(origin_head, owner, tx))
2673 return (SET_ERROR(EBUSY));
2674
2675 /* check amount of any unconsumed refreservation */
2676 unused_refres_delta =
2677 (int64_t)MIN(origin_head->ds_reserved,
2678 dsl_dataset_phys(origin_head)->ds_unique_bytes) -
2679 (int64_t)MIN(origin_head->ds_reserved,
2680 dsl_dataset_phys(clone)->ds_unique_bytes);
2681
2682 if (unused_refres_delta > 0 &&
2683 unused_refres_delta >
2684 dsl_dir_space_available(origin_head->ds_dir, NULL, 0, TRUE))
2685 return (SET_ERROR(ENOSPC));
2686
2687 /* clone can't be over the head's refquota */
2688 if (origin_head->ds_quota != 0 &&
2689 dsl_dataset_phys(clone)->ds_referenced_bytes >
2690 origin_head->ds_quota)
2691 return (SET_ERROR(EDQUOT));
2692
2693 return (0);
2694 }
2695
2696 void
2697 dsl_dataset_clone_swap_sync_impl(dsl_dataset_t *clone,
2698 dsl_dataset_t *origin_head, dmu_tx_t *tx)
2699 {
2700 dsl_pool_t *dp = dmu_tx_pool(tx);
2701 int64_t unused_refres_delta;
2702
2703 ASSERT(clone->ds_reserved == 0);
2704 ASSERT(origin_head->ds_quota == 0 ||
2705 dsl_dataset_phys(clone)->ds_unique_bytes <= origin_head->ds_quota);
2706 ASSERT3P(clone->ds_prev, ==, origin_head->ds_prev);
2707
2708 dmu_buf_will_dirty(clone->ds_dbuf, tx);
2709 dmu_buf_will_dirty(origin_head->ds_dbuf, tx);
2710
2711 if (clone->ds_objset != NULL) {
2712 dmu_objset_evict(clone->ds_objset);
2713 clone->ds_objset = NULL;
2714 }
2715
2716 if (origin_head->ds_objset != NULL) {
2717 dmu_objset_evict(origin_head->ds_objset);
2718 origin_head->ds_objset = NULL;
2719 }
2720
2721 unused_refres_delta =
2722 (int64_t)MIN(origin_head->ds_reserved,
2723 dsl_dataset_phys(origin_head)->ds_unique_bytes) -
2724 (int64_t)MIN(origin_head->ds_reserved,
2725 dsl_dataset_phys(clone)->ds_unique_bytes);
2726
2727 /*
2728 * Reset origin's unique bytes, if it exists.
2729 */
2730 if (clone->ds_prev) {
2731 dsl_dataset_t *origin = clone->ds_prev;
2732 uint64_t comp, uncomp;
2733
2734 dmu_buf_will_dirty(origin->ds_dbuf, tx);
2735 dsl_deadlist_space_range(&clone->ds_deadlist,
2736 dsl_dataset_phys(origin)->ds_prev_snap_txg, UINT64_MAX,
2737 &dsl_dataset_phys(origin)->ds_unique_bytes, &comp, &uncomp);
2738 }
2739
2740 /* swap blkptrs */
2741 {
2742 blkptr_t tmp;
2743 tmp = dsl_dataset_phys(origin_head)->ds_bp;
2744 dsl_dataset_phys(origin_head)->ds_bp =
2745 dsl_dataset_phys(clone)->ds_bp;
2746 dsl_dataset_phys(clone)->ds_bp = tmp;
2747 }
2748
2749 /* set dd_*_bytes */
2750 {
2751 int64_t dused, dcomp, duncomp;
2752 uint64_t cdl_used, cdl_comp, cdl_uncomp;
2753 uint64_t odl_used, odl_comp, odl_uncomp;
2754
2755 ASSERT3U(dsl_dir_phys(clone->ds_dir)->
2756 dd_used_breakdown[DD_USED_SNAP], ==, 0);
2757
2758 dsl_deadlist_space(&clone->ds_deadlist,
2759 &cdl_used, &cdl_comp, &cdl_uncomp);
2760 dsl_deadlist_space(&origin_head->ds_deadlist,
2761 &odl_used, &odl_comp, &odl_uncomp);
2762
2763 dused = dsl_dataset_phys(clone)->ds_referenced_bytes +
2764 cdl_used -
2765 (dsl_dataset_phys(origin_head)->ds_referenced_bytes +
2766 odl_used);
2767 dcomp = dsl_dataset_phys(clone)->ds_compressed_bytes +
2768 cdl_comp -
2769 (dsl_dataset_phys(origin_head)->ds_compressed_bytes +
2770 odl_comp);
2771 duncomp = dsl_dataset_phys(clone)->ds_uncompressed_bytes +
2772 cdl_uncomp -
2773 (dsl_dataset_phys(origin_head)->ds_uncompressed_bytes +
2774 odl_uncomp);
2775
2776 dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_HEAD,
2777 dused, dcomp, duncomp, tx);
2778 dsl_dir_diduse_space(clone->ds_dir, DD_USED_HEAD,
2779 -dused, -dcomp, -duncomp, tx);
2780
2781 /*
2782 * The difference in the space used by snapshots is the
2783 * difference in snapshot space due to the head's
2784 * deadlist (since that's the only thing that's
2785 * changing that affects the snapused).
2786 */
2787 dsl_deadlist_space_range(&clone->ds_deadlist,
2788 origin_head->ds_dir->dd_origin_txg, UINT64_MAX,
2789 &cdl_used, &cdl_comp, &cdl_uncomp);
2790 dsl_deadlist_space_range(&origin_head->ds_deadlist,
2791 origin_head->ds_dir->dd_origin_txg, UINT64_MAX,
2792 &odl_used, &odl_comp, &odl_uncomp);
2793 dsl_dir_transfer_space(origin_head->ds_dir, cdl_used - odl_used,
2794 DD_USED_HEAD, DD_USED_SNAP, tx);
2795 }
2796
2797 /* swap ds_*_bytes */
2798 SWITCH64(dsl_dataset_phys(origin_head)->ds_referenced_bytes,
2799 dsl_dataset_phys(clone)->ds_referenced_bytes);
2800 SWITCH64(dsl_dataset_phys(origin_head)->ds_compressed_bytes,
2801 dsl_dataset_phys(clone)->ds_compressed_bytes);
2802 SWITCH64(dsl_dataset_phys(origin_head)->ds_uncompressed_bytes,
2803 dsl_dataset_phys(clone)->ds_uncompressed_bytes);
2804 SWITCH64(dsl_dataset_phys(origin_head)->ds_unique_bytes,
2805 dsl_dataset_phys(clone)->ds_unique_bytes);
2806
2807 /* apply any parent delta for change in unconsumed refreservation */
2808 dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_REFRSRV,
2809 unused_refres_delta, 0, 0, tx);
2810
2811 /*
2812 * Swap deadlists.
2813 */
2814 dsl_deadlist_close(&clone->ds_deadlist);
2815 dsl_deadlist_close(&origin_head->ds_deadlist);
2816 SWITCH64(dsl_dataset_phys(origin_head)->ds_deadlist_obj,
2817 dsl_dataset_phys(clone)->ds_deadlist_obj);
2818 dsl_deadlist_open(&clone->ds_deadlist, dp->dp_meta_objset,
2819 dsl_dataset_phys(clone)->ds_deadlist_obj);
2820 dsl_deadlist_open(&origin_head->ds_deadlist, dp->dp_meta_objset,
2821 dsl_dataset_phys(origin_head)->ds_deadlist_obj);
2822
2823 dsl_scan_ds_clone_swapped(origin_head, clone, tx);
2824
2825 spa_history_log_internal_ds(clone, "clone swap", tx,
2826 "parent=%s", origin_head->ds_dir->dd_myname);
2827 }
2828
2829 /*
2830 * Given a pool name and a dataset object number in that pool,
2831 * return the name of that dataset.
2832 */
2833 int
2834 dsl_dsobj_to_dsname(char *pname, uint64_t obj, char *buf)
2835 {
2836 dsl_pool_t *dp;
2837 dsl_dataset_t *ds;
2838 int error;
2839
2840 error = dsl_pool_hold(pname, FTAG, &dp);
2841 if (error != 0)
2842 return (error);
2843
2844 error = dsl_dataset_hold_obj(dp, obj, FTAG, &ds);
2845 if (error == 0) {
2846 dsl_dataset_name(ds, buf);
2847 dsl_dataset_rele(ds, FTAG);
2848 }
2849 dsl_pool_rele(dp, FTAG);
2850
2851 return (error);
2852 }
2853
2854 int
2855 dsl_dataset_check_quota(dsl_dataset_t *ds, boolean_t check_quota,
2856 uint64_t asize, uint64_t inflight, uint64_t *used, uint64_t *ref_rsrv)
2857 {
2858 int error = 0;
2859
2860 ASSERT3S(asize, >, 0);
2861
2862 /*
2863 * *ref_rsrv is the portion of asize that will come from any
2864 * unconsumed refreservation space.
2865 */
2866 *ref_rsrv = 0;
2867
2868 mutex_enter(&ds->ds_lock);
2869 /*
2870 * Make a space adjustment for reserved bytes.
2871 */
2872 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes) {
2873 ASSERT3U(*used, >=,
2874 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes);
2875 *used -=
2876 (ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes);
2877 *ref_rsrv =
2878 asize - MIN(asize, parent_delta(ds, asize + inflight));
2879 }
2880
2881 if (!check_quota || ds->ds_quota == 0) {
2882 mutex_exit(&ds->ds_lock);
2883 return (0);
2884 }
2885 /*
2886 * If they are requesting more space, and our current estimate
2887 * is over quota, they get to try again unless the actual
2888 * on-disk is over quota and there are no pending changes (which
2889 * may free up space for us).
2890 */
2891 if (dsl_dataset_phys(ds)->ds_referenced_bytes + inflight >=
2892 ds->ds_quota) {
2893 if (inflight > 0 ||
2894 dsl_dataset_phys(ds)->ds_referenced_bytes < ds->ds_quota)
2895 error = SET_ERROR(ERESTART);
2896 else
2897 error = SET_ERROR(EDQUOT);
2898 }
2899 mutex_exit(&ds->ds_lock);
2900
2901 return (error);
2902 }
2903
2904 typedef struct dsl_dataset_set_qr_arg {
2905 const char *ddsqra_name;
2906 zprop_source_t ddsqra_source;
2907 uint64_t ddsqra_value;
2908 } dsl_dataset_set_qr_arg_t;
2909
2910
2911 /* ARGSUSED */
2912 static int
2913 dsl_dataset_set_refquota_check(void *arg, dmu_tx_t *tx)
2914 {
2915 dsl_dataset_set_qr_arg_t *ddsqra = arg;
2916 dsl_pool_t *dp = dmu_tx_pool(tx);
2917 dsl_dataset_t *ds;
2918 int error;
2919 uint64_t newval;
2920
2921 if (spa_version(dp->dp_spa) < SPA_VERSION_REFQUOTA)
2922 return (SET_ERROR(ENOTSUP));
2923
2924 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds);
2925 if (error != 0)
2926 return (error);
2927
2928 if (ds->ds_is_snapshot) {
2929 dsl_dataset_rele(ds, FTAG);
2930 return (SET_ERROR(EINVAL));
2931 }
2932
2933 error = dsl_prop_predict(ds->ds_dir,
2934 zfs_prop_to_name(ZFS_PROP_REFQUOTA),
2935 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval);
2936 if (error != 0) {
2937 dsl_dataset_rele(ds, FTAG);
2938 return (error);
2939 }
2940
2941 if (newval == 0) {
2942 dsl_dataset_rele(ds, FTAG);
2943 return (0);
2944 }
2945
2946 if (newval < dsl_dataset_phys(ds)->ds_referenced_bytes ||
2947 newval < ds->ds_reserved) {
2948 dsl_dataset_rele(ds, FTAG);
2949 return (SET_ERROR(ENOSPC));
2950 }
2951
2952 dsl_dataset_rele(ds, FTAG);
2953 return (0);
2954 }
2955
2956 static void
2957 dsl_dataset_set_refquota_sync(void *arg, dmu_tx_t *tx)
2958 {
2959 dsl_dataset_set_qr_arg_t *ddsqra = arg;
2960 dsl_pool_t *dp = dmu_tx_pool(tx);
2961 dsl_dataset_t *ds;
2962 uint64_t newval;
2963
2964 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds));
2965
2966 dsl_prop_set_sync_impl(ds,
2967 zfs_prop_to_name(ZFS_PROP_REFQUOTA),
2968 ddsqra->ddsqra_source, sizeof (ddsqra->ddsqra_value), 1,
2969 &ddsqra->ddsqra_value, tx);
2970
2971 VERIFY0(dsl_prop_get_int_ds(ds,
2972 zfs_prop_to_name(ZFS_PROP_REFQUOTA), &newval));
2973
2974 if (ds->ds_quota != newval) {
2975 dmu_buf_will_dirty(ds->ds_dbuf, tx);
2976 ds->ds_quota = newval;
2977 }
2978 dsl_dataset_rele(ds, FTAG);
2979 }
2980
2981 int
2982 dsl_dataset_set_refquota(const char *dsname, zprop_source_t source,
2983 uint64_t refquota)
2984 {
2985 dsl_dataset_set_qr_arg_t ddsqra;
2986
2987 ddsqra.ddsqra_name = dsname;
2988 ddsqra.ddsqra_source = source;
2989 ddsqra.ddsqra_value = refquota;
2990
2991 return (dsl_sync_task(dsname, dsl_dataset_set_refquota_check,
2992 dsl_dataset_set_refquota_sync, &ddsqra, 0, ZFS_SPACE_CHECK_NONE));
2993 }
2994
2995 static int
2996 dsl_dataset_set_refreservation_check(void *arg, dmu_tx_t *tx)
2997 {
2998 dsl_dataset_set_qr_arg_t *ddsqra = arg;
2999 dsl_pool_t *dp = dmu_tx_pool(tx);
3000 dsl_dataset_t *ds;
3001 int error;
3002 uint64_t newval, unique;
3003
3004 if (spa_version(dp->dp_spa) < SPA_VERSION_REFRESERVATION)
3005 return (SET_ERROR(ENOTSUP));
3006
3007 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds);
3008 if (error != 0)
3009 return (error);
3010
3011 if (ds->ds_is_snapshot) {
3012 dsl_dataset_rele(ds, FTAG);
3013 return (SET_ERROR(EINVAL));
3014 }
3015
3016 error = dsl_prop_predict(ds->ds_dir,
3017 zfs_prop_to_name(ZFS_PROP_REFRESERVATION),
3018 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval);
3019 if (error != 0) {
3020 dsl_dataset_rele(ds, FTAG);
3021 return (error);
3022 }
3023
3024 /*
3025 * If we are doing the preliminary check in open context, the
3026 * space estimates may be inaccurate.
3027 */
3028 if (!dmu_tx_is_syncing(tx)) {
3029 dsl_dataset_rele(ds, FTAG);
3030 return (0);
3031 }
3032
3033 mutex_enter(&ds->ds_lock);
3034 if (!DS_UNIQUE_IS_ACCURATE(ds))
3035 dsl_dataset_recalc_head_uniq(ds);
3036 unique = dsl_dataset_phys(ds)->ds_unique_bytes;
3037 mutex_exit(&ds->ds_lock);
3038
3039 if (MAX(unique, newval) > MAX(unique, ds->ds_reserved)) {
3040 uint64_t delta = MAX(unique, newval) -
3041 MAX(unique, ds->ds_reserved);
3042
3043 if (delta >
3044 dsl_dir_space_available(ds->ds_dir, NULL, 0, B_TRUE) ||
3045 (ds->ds_quota > 0 && newval > ds->ds_quota)) {
3046 dsl_dataset_rele(ds, FTAG);
3047 return (SET_ERROR(ENOSPC));
3048 }
3049 }
3050
3051 dsl_dataset_rele(ds, FTAG);
3052 return (0);
3053 }
3054
3055 void
3056 dsl_dataset_set_refreservation_sync_impl(dsl_dataset_t *ds,
3057 zprop_source_t source, uint64_t value, dmu_tx_t *tx)
3058 {
3059 uint64_t newval;
3060 uint64_t unique;
3061 int64_t delta;
3062
3063 dsl_prop_set_sync_impl(ds, zfs_prop_to_name(ZFS_PROP_REFRESERVATION),
3064 source, sizeof (value), 1, &value, tx);
3065
3066 VERIFY0(dsl_prop_get_int_ds(ds,
3067 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), &newval));
3068
3069 dmu_buf_will_dirty(ds->ds_dbuf, tx);
3070 mutex_enter(&ds->ds_dir->dd_lock);
3071 mutex_enter(&ds->ds_lock);
3072 ASSERT(DS_UNIQUE_IS_ACCURATE(ds));
3073 unique = dsl_dataset_phys(ds)->ds_unique_bytes;
3074 delta = MAX(0, (int64_t)(newval - unique)) -
3075 MAX(0, (int64_t)(ds->ds_reserved - unique));
3076 ds->ds_reserved = newval;
3077 mutex_exit(&ds->ds_lock);
3078
3079 dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV, delta, 0, 0, tx);
3080 mutex_exit(&ds->ds_dir->dd_lock);
3081 }
3082
3083 static void
3084 dsl_dataset_set_refreservation_sync(void *arg, dmu_tx_t *tx)
3085 {
3086 dsl_dataset_set_qr_arg_t *ddsqra = arg;
3087 dsl_pool_t *dp = dmu_tx_pool(tx);
3088 dsl_dataset_t *ds;
3089
3090 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds));
3091 dsl_dataset_set_refreservation_sync_impl(ds,
3092 ddsqra->ddsqra_source, ddsqra->ddsqra_value, tx);
3093 dsl_dataset_rele(ds, FTAG);
3094 }
3095
3096 int
3097 dsl_dataset_set_refreservation(const char *dsname, zprop_source_t source,
3098 uint64_t refreservation)
3099 {
3100 dsl_dataset_set_qr_arg_t ddsqra;
3101
3102 ddsqra.ddsqra_name = dsname;
3103 ddsqra.ddsqra_source = source;
3104 ddsqra.ddsqra_value = refreservation;
3105
3106 return (dsl_sync_task(dsname, dsl_dataset_set_refreservation_check,
3107 dsl_dataset_set_refreservation_sync, &ddsqra,
3108 0, ZFS_SPACE_CHECK_NONE));
3109 }
3110
3111 /*
3112 * Return (in *usedp) the amount of space written in new that is not
3113 * present in oldsnap. New may be a snapshot or the head. Old must be
3114 * a snapshot before new, in new's filesystem (or its origin). If not then
3115 * fail and return EINVAL.
3116 *
3117 * The written space is calculated by considering two components: First, we
3118 * ignore any freed space, and calculate the written as new's used space
3119 * minus old's used space. Next, we add in the amount of space that was freed
3120 * between the two snapshots, thus reducing new's used space relative to old's.
3121 * Specifically, this is the space that was born before old->ds_creation_txg,
3122 * and freed before new (ie. on new's deadlist or a previous deadlist).
3123 *
3124 * space freed [---------------------]
3125 * snapshots ---O-------O--------O-------O------
3126 * oldsnap new
3127 */
3128 int
3129 dsl_dataset_space_written(dsl_dataset_t *oldsnap, dsl_dataset_t *new,
3130 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp)
3131 {
3132 int err = 0;
3133 uint64_t snapobj;
3134 dsl_pool_t *dp = new->ds_dir->dd_pool;
3135
3136 ASSERT(dsl_pool_config_held(dp));
3137
3138 *usedp = 0;
3139 *usedp += dsl_dataset_phys(new)->ds_referenced_bytes;
3140 *usedp -= dsl_dataset_phys(oldsnap)->ds_referenced_bytes;
3141
3142 *compp = 0;
3143 *compp += dsl_dataset_phys(new)->ds_compressed_bytes;
3144 *compp -= dsl_dataset_phys(oldsnap)->ds_compressed_bytes;
3145
3146 *uncompp = 0;
3147 *uncompp += dsl_dataset_phys(new)->ds_uncompressed_bytes;
3148 *uncompp -= dsl_dataset_phys(oldsnap)->ds_uncompressed_bytes;
3149
3150 snapobj = new->ds_object;
3151 while (snapobj != oldsnap->ds_object) {
3152 dsl_dataset_t *snap;
3153 uint64_t used, comp, uncomp;
3154
3155 if (snapobj == new->ds_object) {
3156 snap = new;
3157 } else {
3158 err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &snap);
3159 if (err != 0)
3160 break;
3161 }
3162
3163 if (dsl_dataset_phys(snap)->ds_prev_snap_txg ==
3164 dsl_dataset_phys(oldsnap)->ds_creation_txg) {
3165 /*
3166 * The blocks in the deadlist can not be born after
3167 * ds_prev_snap_txg, so get the whole deadlist space,
3168 * which is more efficient (especially for old-format
3169 * deadlists). Unfortunately the deadlist code
3170 * doesn't have enough information to make this
3171 * optimization itself.
3172 */
3173 dsl_deadlist_space(&snap->ds_deadlist,
3174 &used, &comp, &uncomp);
3175 } else {
3176 dsl_deadlist_space_range(&snap->ds_deadlist,
3177 0, dsl_dataset_phys(oldsnap)->ds_creation_txg,
3178 &used, &comp, &uncomp);
3179 }
3180 *usedp += used;
3181 *compp += comp;
3182 *uncompp += uncomp;
3183
3184 /*
3185 * If we get to the beginning of the chain of snapshots
3186 * (ds_prev_snap_obj == 0) before oldsnap, then oldsnap
3187 * was not a snapshot of/before new.
3188 */
3189 snapobj = dsl_dataset_phys(snap)->ds_prev_snap_obj;
3190 if (snap != new)
3191 dsl_dataset_rele(snap, FTAG);
3192 if (snapobj == 0) {
3193 err = SET_ERROR(EINVAL);
3194 break;
3195 }
3196
3197 }
3198 return (err);
3199 }
3200
3201 /*
3202 * Return (in *usedp) the amount of space that will be reclaimed if firstsnap,
3203 * lastsnap, and all snapshots in between are deleted.
3204 *
3205 * blocks that would be freed [---------------------------]
3206 * snapshots ---O-------O--------O-------O--------O
3207 * firstsnap lastsnap
3208 *
3209 * This is the set of blocks that were born after the snap before firstsnap,
3210 * (birth > firstsnap->prev_snap_txg) and died before the snap after the
3211 * last snap (ie, is on lastsnap->ds_next->ds_deadlist or an earlier deadlist).
3212 * We calculate this by iterating over the relevant deadlists (from the snap
3213 * after lastsnap, backward to the snap after firstsnap), summing up the
3214 * space on the deadlist that was born after the snap before firstsnap.
3215 */
3216 int
3217 dsl_dataset_space_wouldfree(dsl_dataset_t *firstsnap,
3218 dsl_dataset_t *lastsnap,
3219 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp)
3220 {
3221 int err = 0;
3222 uint64_t snapobj;
3223 dsl_pool_t *dp = firstsnap->ds_dir->dd_pool;
3224
3225 ASSERT(firstsnap->ds_is_snapshot);
3226 ASSERT(lastsnap->ds_is_snapshot);
3227
3228 /*
3229 * Check that the snapshots are in the same dsl_dir, and firstsnap
3230 * is before lastsnap.
3231 */
3232 if (firstsnap->ds_dir != lastsnap->ds_dir ||
3233 dsl_dataset_phys(firstsnap)->ds_creation_txg >
3234 dsl_dataset_phys(lastsnap)->ds_creation_txg)
3235 return (SET_ERROR(EINVAL));
3236
3237 *usedp = *compp = *uncompp = 0;
3238
3239 snapobj = dsl_dataset_phys(lastsnap)->ds_next_snap_obj;
3240 while (snapobj != firstsnap->ds_object) {
3241 dsl_dataset_t *ds;
3242 uint64_t used, comp, uncomp;
3243
3244 err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &ds);
3245 if (err != 0)
3246 break;
3247
3248 dsl_deadlist_space_range(&ds->ds_deadlist,
3249 dsl_dataset_phys(firstsnap)->ds_prev_snap_txg, UINT64_MAX,
3250 &used, &comp, &uncomp);
3251 *usedp += used;
3252 *compp += comp;
3253 *uncompp += uncomp;
3254
3255 snapobj = dsl_dataset_phys(ds)->ds_prev_snap_obj;
3256 ASSERT3U(snapobj, !=, 0);
3257 dsl_dataset_rele(ds, FTAG);
3258 }
3259 return (err);
3260 }
3261
3262 static int
3263 dsl_dataset_activate_large_blocks_check(void *arg, dmu_tx_t *tx)
3264 {
3265 const char *dsname = arg;
3266 dsl_dataset_t *ds;
3267 dsl_pool_t *dp = dmu_tx_pool(tx);
3268 int error = 0;
3269
3270 if (!spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_LARGE_BLOCKS))
3271 return (SET_ERROR(ENOTSUP));
3272
3273 ASSERT(spa_feature_is_enabled(dp->dp_spa,
3274 SPA_FEATURE_EXTENSIBLE_DATASET));
3275
3276 error = dsl_dataset_hold(dp, dsname, FTAG, &ds);
3277 if (error != 0)
3278 return (error);
3279
3280 if (ds->ds_large_blocks)
3281 error = EALREADY;
3282 dsl_dataset_rele(ds, FTAG);
3283
3284 return (error);
3285 }
3286
3287 void
3288 dsl_dataset_activate_large_blocks_sync_impl(uint64_t dsobj, dmu_tx_t *tx)
3289 {
3290 spa_t *spa = dmu_tx_pool(tx)->dp_spa;
3291 objset_t *mos = dmu_tx_pool(tx)->dp_meta_objset;
3292 uint64_t zero = 0;
3293
3294 spa_feature_incr(spa, SPA_FEATURE_LARGE_BLOCKS, tx);
3295 dmu_object_zapify(mos, dsobj, DMU_OT_DSL_DATASET, tx);
3296
3297 VERIFY0(zap_add(mos, dsobj, DS_FIELD_LARGE_BLOCKS,
3298 sizeof (zero), 1, &zero, tx));
3299 }
3300
3301 static void
3302 dsl_dataset_activate_large_blocks_sync(void *arg, dmu_tx_t *tx)
3303 {
3304 const char *dsname = arg;
3305 dsl_dataset_t *ds;
3306
3307 VERIFY0(dsl_dataset_hold(dmu_tx_pool(tx), dsname, FTAG, &ds));
3308
3309 dsl_dataset_activate_large_blocks_sync_impl(ds->ds_object, tx);
3310 ASSERT(!ds->ds_large_blocks);
3311 ds->ds_large_blocks = B_TRUE;
3312 dsl_dataset_rele(ds, FTAG);
3313 }
3314
3315 int
3316 dsl_dataset_activate_large_blocks(const char *dsname)
3317 {
3318 int error;
3319
3320 error = dsl_sync_task(dsname,
3321 dsl_dataset_activate_large_blocks_check,
3322 dsl_dataset_activate_large_blocks_sync, (void *)dsname,
3323 1, ZFS_SPACE_CHECK_RESERVED);
3324
3325 /*
3326 * EALREADY indicates that this dataset already supports large blocks.
3327 */
3328 if (error == EALREADY)
3329 error = 0;
3330 return (error);
3331 }
3332
3333 /*
3334 * Return TRUE if 'earlier' is an earlier snapshot in 'later's timeline.
3335 * For example, they could both be snapshots of the same filesystem, and
3336 * 'earlier' is before 'later'. Or 'earlier' could be the origin of
3337 * 'later's filesystem. Or 'earlier' could be an older snapshot in the origin's
3338 * filesystem. Or 'earlier' could be the origin's origin.
3339 *
3340 * If non-zero, earlier_txg is used instead of earlier's ds_creation_txg.
3341 */
3342 boolean_t
3343 dsl_dataset_is_before(dsl_dataset_t *later, dsl_dataset_t *earlier,
3344 uint64_t earlier_txg)
3345 {
3346 dsl_pool_t *dp = later->ds_dir->dd_pool;
3347 int error;
3348 boolean_t ret;
3349 dsl_dataset_t *origin;
3350
3351 ASSERT(dsl_pool_config_held(dp));
3352 ASSERT(earlier->ds_is_snapshot || earlier_txg != 0);
3353
3354 if (earlier_txg == 0)
3355 earlier_txg = dsl_dataset_phys(earlier)->ds_creation_txg;
3356
3357 if (later->ds_is_snapshot &&
3358 earlier_txg >= dsl_dataset_phys(later)->ds_creation_txg)
3359 return (B_FALSE);
3360
3361 if (later->ds_dir == earlier->ds_dir)
3362 return (B_TRUE);
3363 if (!dsl_dir_is_clone(later->ds_dir))
3364 return (B_FALSE);
3365
3366 if (dsl_dir_phys(later->ds_dir)->dd_origin_obj == earlier->ds_object)
3367 return (B_TRUE);
3368 error = dsl_dataset_hold_obj(dp,
3369 dsl_dir_phys(later->ds_dir)->dd_origin_obj, FTAG, &origin);
3370 if (error != 0)
3371 return (B_FALSE);
3372 ret = dsl_dataset_is_before(origin, earlier, earlier_txg);
3373 dsl_dataset_rele(origin, FTAG);
3374 return (ret);
3375 }
3376
3377
3378 void
3379 dsl_dataset_zapify(dsl_dataset_t *ds, dmu_tx_t *tx)
3380 {
3381 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
3382 dmu_object_zapify(mos, ds->ds_object, DMU_OT_DSL_DATASET, tx);
3383 }
3384
3385 #if defined(_KERNEL) && defined(HAVE_SPL)
3386 #if defined(_LP64)
3387 module_param(zfs_max_recordsize, int, 0644);
3388 MODULE_PARM_DESC(zfs_max_recordsize, "Max allowed record size");
3389 #else
3390 /* Limited to 1M on 32-bit platforms due to lack of virtual address space */
3391 module_param(zfs_max_recordsize, int, 0444);
3392 MODULE_PARM_DESC(zfs_max_recordsize, "Max allowed record size");
3393 #endif
3394
3395 EXPORT_SYMBOL(dsl_dataset_hold);
3396 EXPORT_SYMBOL(dsl_dataset_hold_obj);
3397 EXPORT_SYMBOL(dsl_dataset_own);
3398 EXPORT_SYMBOL(dsl_dataset_own_obj);
3399 EXPORT_SYMBOL(dsl_dataset_name);
3400 EXPORT_SYMBOL(dsl_dataset_rele);
3401 EXPORT_SYMBOL(dsl_dataset_disown);
3402 EXPORT_SYMBOL(dsl_dataset_tryown);
3403 EXPORT_SYMBOL(dsl_dataset_create_sync);
3404 EXPORT_SYMBOL(dsl_dataset_create_sync_dd);
3405 EXPORT_SYMBOL(dsl_dataset_snapshot_check);
3406 EXPORT_SYMBOL(dsl_dataset_snapshot_sync);
3407 EXPORT_SYMBOL(dsl_dataset_promote);
3408 EXPORT_SYMBOL(dsl_dataset_user_hold);
3409 EXPORT_SYMBOL(dsl_dataset_user_release);
3410 EXPORT_SYMBOL(dsl_dataset_get_holds);
3411 EXPORT_SYMBOL(dsl_dataset_get_blkptr);
3412 EXPORT_SYMBOL(dsl_dataset_set_blkptr);
3413 EXPORT_SYMBOL(dsl_dataset_get_spa);
3414 EXPORT_SYMBOL(dsl_dataset_modified_since_snap);
3415 EXPORT_SYMBOL(dsl_dataset_space_written);
3416 EXPORT_SYMBOL(dsl_dataset_space_wouldfree);
3417 EXPORT_SYMBOL(dsl_dataset_sync);
3418 EXPORT_SYMBOL(dsl_dataset_block_born);
3419 EXPORT_SYMBOL(dsl_dataset_block_kill);
3420 EXPORT_SYMBOL(dsl_dataset_block_freeable);
3421 EXPORT_SYMBOL(dsl_dataset_prev_snap_txg);
3422 EXPORT_SYMBOL(dsl_dataset_dirty);
3423 EXPORT_SYMBOL(dsl_dataset_stats);
3424 EXPORT_SYMBOL(dsl_dataset_fast_stat);
3425 EXPORT_SYMBOL(dsl_dataset_space);
3426 EXPORT_SYMBOL(dsl_dataset_fsid_guid);
3427 EXPORT_SYMBOL(dsl_dsobj_to_dsname);
3428 EXPORT_SYMBOL(dsl_dataset_check_quota);
3429 EXPORT_SYMBOL(dsl_dataset_clone_swap_check_impl);
3430 EXPORT_SYMBOL(dsl_dataset_clone_swap_sync_impl);
3431 #endif
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