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 /*
23 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Copyright (c) 2011, 2017 by Delphix. All rights reserved.
25 * Copyright (c) 2014, Joyent, Inc. All rights reserved.
26 * Copyright (c) 2014 RackTop Systems.
27 * Copyright (c) 2014 Spectra Logic Corporation, All rights reserved.
28 * Copyright (c) 2014 Integros [integros.com]
29 * Copyright 2016, OmniTI Computer Consulting, Inc. All rights reserved.
30 * Copyright 2017 Nexenta Systems, Inc.
31 */
32
33 #include <sys/dmu_objset.h>
34 #include <sys/dsl_dataset.h>
35 #include <sys/dsl_dir.h>
36 #include <sys/dsl_prop.h>
37 #include <sys/dsl_synctask.h>
38 #include <sys/dmu_traverse.h>
39 #include <sys/dmu_impl.h>
40 #include <sys/dmu_tx.h>
41 #include <sys/arc.h>
42 #include <sys/zio.h>
43 #include <sys/zap.h>
44 #include <sys/zfeature.h>
45 #include <sys/unique.h>
46 #include <sys/zfs_context.h>
47 #include <sys/zfs_ioctl.h>
48 #include <sys/spa.h>
49 #include <sys/vdev.h>
50 #include <sys/zfs_znode.h>
51 #include <sys/zfs_onexit.h>
52 #include <sys/zvol.h>
53 #include <sys/dsl_scan.h>
54 #include <sys/dsl_deadlist.h>
55 #include <sys/dsl_destroy.h>
56 #include <sys/dsl_userhold.h>
57 #include <sys/dsl_bookmark.h>
58 #include <sys/dmu_send.h>
59 #include <sys/zio_checksum.h>
60 #include <sys/zio_compress.h>
61 #include <zfs_fletcher.h>
62
63 /*
64 * The SPA supports block sizes up to 16MB. However, very large blocks
65 * can have an impact on i/o latency (e.g. tying up a spinning disk for
66 * ~300ms), and also potentially on the memory allocator. Therefore,
67 * we do not allow the recordsize to be set larger than zfs_max_recordsize
68 * (default 1MB). Larger blocks can be created by changing this tunable,
69 * and pools with larger blocks can always be imported and used, regardless
70 * of this setting.
71 */
72 int zfs_max_recordsize = 1 * 1024 * 1024;
73
74 #define SWITCH64(x, y) \
75 { \
76 uint64_t __tmp = (x); \
77 (x) = (y); \
78 (y) = __tmp; \
79 }
80
81 #define DS_REF_MAX (1ULL << 62)
82
83 extern inline dsl_dataset_phys_t *dsl_dataset_phys(dsl_dataset_t *ds);
84
85 static void dsl_dataset_set_remap_deadlist_object(dsl_dataset_t *ds,
86 uint64_t obj, dmu_tx_t *tx);
87 static void dsl_dataset_unset_remap_deadlist_object(dsl_dataset_t *ds,
88 dmu_tx_t *tx);
89
90 extern int spa_asize_inflation;
91
92 static zil_header_t zero_zil;
93
94 /*
95 * Figure out how much of this delta should be propogated to the dsl_dir
96 * layer. If there's a refreservation, that space has already been
97 * partially accounted for in our ancestors.
98 */
99 static int64_t
100 parent_delta(dsl_dataset_t *ds, int64_t delta)
101 {
102 dsl_dataset_phys_t *ds_phys;
103 uint64_t old_bytes, new_bytes;
104
105 if (ds->ds_reserved == 0)
106 return (delta);
107
108 ds_phys = dsl_dataset_phys(ds);
109 old_bytes = MAX(ds_phys->ds_unique_bytes, ds->ds_reserved);
110 new_bytes = MAX(ds_phys->ds_unique_bytes + delta, ds->ds_reserved);
111
112 ASSERT3U(ABS((int64_t)(new_bytes - old_bytes)), <=, ABS(delta));
113 return (new_bytes - old_bytes);
114 }
115
116 void
117 dsl_dataset_block_born(dsl_dataset_t *ds, const blkptr_t *bp, dmu_tx_t *tx)
118 {
119 int used = bp_get_dsize_sync(tx->tx_pool->dp_spa, bp);
120 int compressed = BP_GET_PSIZE(bp);
121 int uncompressed = BP_GET_UCSIZE(bp);
122 int64_t delta;
123
124 dprintf_bp(bp, "ds=%p", ds);
125
126 ASSERT(dmu_tx_is_syncing(tx));
127 /* It could have been compressed away to nothing */
128 if (BP_IS_HOLE(bp))
129 return;
130 ASSERT(BP_GET_TYPE(bp) != DMU_OT_NONE);
131 ASSERT(DMU_OT_IS_VALID(BP_GET_TYPE(bp)));
132 if (ds == NULL) {
133 dsl_pool_mos_diduse_space(tx->tx_pool,
134 used, compressed, uncompressed);
135 return;
136 }
137
138 ASSERT3U(bp->blk_birth, >, dsl_dataset_phys(ds)->ds_prev_snap_txg);
139 dmu_buf_will_dirty(ds->ds_dbuf, tx);
140 mutex_enter(&ds->ds_lock);
141 delta = parent_delta(ds, used);
142 dsl_dataset_phys(ds)->ds_referenced_bytes += used;
143 dsl_dataset_phys(ds)->ds_compressed_bytes += compressed;
144 dsl_dataset_phys(ds)->ds_uncompressed_bytes += uncompressed;
145 dsl_dataset_phys(ds)->ds_unique_bytes += used;
146
147 if (BP_GET_LSIZE(bp) > SPA_OLD_MAXBLOCKSIZE) {
148 ds->ds_feature_activation_needed[SPA_FEATURE_LARGE_BLOCKS] =
149 B_TRUE;
150 }
151
152 spa_feature_t f = zio_checksum_to_feature(BP_GET_CHECKSUM(bp));
153 if (f != SPA_FEATURE_NONE)
154 ds->ds_feature_activation_needed[f] = B_TRUE;
155
156 mutex_exit(&ds->ds_lock);
157 dsl_dir_diduse_space(ds->ds_dir, DD_USED_HEAD, delta,
158 compressed, uncompressed, tx);
159 dsl_dir_transfer_space(ds->ds_dir, used - delta,
160 DD_USED_REFRSRV, DD_USED_HEAD, tx);
161 }
162
163 /*
164 * Called when the specified segment has been remapped, and is thus no
165 * longer referenced in the head dataset. The vdev must be indirect.
166 *
167 * If the segment is referenced by a snapshot, put it on the remap deadlist.
168 * Otherwise, add this segment to the obsolete spacemap.
169 */
170 void
171 dsl_dataset_block_remapped(dsl_dataset_t *ds, uint64_t vdev, uint64_t offset,
172 uint64_t size, uint64_t birth, dmu_tx_t *tx)
173 {
174 spa_t *spa = ds->ds_dir->dd_pool->dp_spa;
175
176 ASSERT(dmu_tx_is_syncing(tx));
177 ASSERT(birth <= tx->tx_txg);
178 ASSERT(!ds->ds_is_snapshot);
179
180 if (birth > dsl_dataset_phys(ds)->ds_prev_snap_txg) {
181 spa_vdev_indirect_mark_obsolete(spa, vdev, offset, size, tx);
182 } else {
183 blkptr_t fakebp;
184 dva_t *dva = &fakebp.blk_dva[0];
185
186 ASSERT(ds != NULL);
187
188 mutex_enter(&ds->ds_remap_deadlist_lock);
189 if (!dsl_dataset_remap_deadlist_exists(ds)) {
190 dsl_dataset_create_remap_deadlist(ds, tx);
191 }
192 mutex_exit(&ds->ds_remap_deadlist_lock);
193
194 BP_ZERO(&fakebp);
195 fakebp.blk_birth = birth;
196 DVA_SET_VDEV(dva, vdev);
197 DVA_SET_OFFSET(dva, offset);
198 DVA_SET_ASIZE(dva, size);
199
200 dsl_deadlist_insert(&ds->ds_remap_deadlist, &fakebp, tx);
201 }
202 }
203
204 int
205 dsl_dataset_block_kill(dsl_dataset_t *ds, const blkptr_t *bp, dmu_tx_t *tx,
206 boolean_t async)
207 {
208 int used = bp_get_dsize_sync(tx->tx_pool->dp_spa, bp);
209 int compressed = BP_GET_PSIZE(bp);
210 int uncompressed = BP_GET_UCSIZE(bp);
211
212 if (BP_IS_HOLE(bp))
213 return (0);
214
215 ASSERT(dmu_tx_is_syncing(tx));
216 ASSERT(bp->blk_birth <= tx->tx_txg);
217
218 if (ds == NULL) {
219 dsl_free(tx->tx_pool, tx->tx_txg, bp);
220 dsl_pool_mos_diduse_space(tx->tx_pool,
221 -used, -compressed, -uncompressed);
222 return (used);
223 }
224 ASSERT3P(tx->tx_pool, ==, ds->ds_dir->dd_pool);
225
226 ASSERT(!ds->ds_is_snapshot);
227 dmu_buf_will_dirty(ds->ds_dbuf, tx);
228
229 if (bp->blk_birth > dsl_dataset_phys(ds)->ds_prev_snap_txg) {
230 int64_t delta;
231
232 dprintf_bp(bp, "freeing ds=%llu", ds->ds_object);
233 dsl_free(tx->tx_pool, tx->tx_txg, bp);
234
235 mutex_enter(&ds->ds_lock);
236 ASSERT(dsl_dataset_phys(ds)->ds_unique_bytes >= used ||
237 !DS_UNIQUE_IS_ACCURATE(ds));
238 delta = parent_delta(ds, -used);
239 dsl_dataset_phys(ds)->ds_unique_bytes -= used;
240 mutex_exit(&ds->ds_lock);
241 dsl_dir_diduse_space(ds->ds_dir, DD_USED_HEAD,
242 delta, -compressed, -uncompressed, tx);
243 dsl_dir_transfer_space(ds->ds_dir, -used - delta,
244 DD_USED_REFRSRV, DD_USED_HEAD, tx);
245 } else {
246 dprintf_bp(bp, "putting on dead list: %s", "");
247 if (async) {
248 /*
249 * We are here as part of zio's write done callback,
250 * which means we're a zio interrupt thread. We can't
251 * call dsl_deadlist_insert() now because it may block
252 * waiting for I/O. Instead, put bp on the deferred
253 * queue and let dsl_pool_sync() finish the job.
254 */
255 bplist_append(&ds->ds_pending_deadlist, bp);
256 } else {
257 dsl_deadlist_insert(&ds->ds_deadlist, bp, tx);
258 }
259 ASSERT3U(ds->ds_prev->ds_object, ==,
260 dsl_dataset_phys(ds)->ds_prev_snap_obj);
261 ASSERT(dsl_dataset_phys(ds->ds_prev)->ds_num_children > 0);
262 /* if (bp->blk_birth > prev prev snap txg) prev unique += bs */
263 if (dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj ==
264 ds->ds_object && bp->blk_birth >
265 dsl_dataset_phys(ds->ds_prev)->ds_prev_snap_txg) {
266 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx);
267 mutex_enter(&ds->ds_prev->ds_lock);
268 dsl_dataset_phys(ds->ds_prev)->ds_unique_bytes += used;
269 mutex_exit(&ds->ds_prev->ds_lock);
270 }
271 if (bp->blk_birth > ds->ds_dir->dd_origin_txg) {
272 dsl_dir_transfer_space(ds->ds_dir, used,
273 DD_USED_HEAD, DD_USED_SNAP, tx);
274 }
275 }
276 mutex_enter(&ds->ds_lock);
277 ASSERT3U(dsl_dataset_phys(ds)->ds_referenced_bytes, >=, used);
278 dsl_dataset_phys(ds)->ds_referenced_bytes -= used;
279 ASSERT3U(dsl_dataset_phys(ds)->ds_compressed_bytes, >=, compressed);
280 dsl_dataset_phys(ds)->ds_compressed_bytes -= compressed;
281 ASSERT3U(dsl_dataset_phys(ds)->ds_uncompressed_bytes, >=, uncompressed);
282 dsl_dataset_phys(ds)->ds_uncompressed_bytes -= uncompressed;
283 mutex_exit(&ds->ds_lock);
284
285 return (used);
286 }
287
288 /*
289 * We have to release the fsid syncronously or we risk that a subsequent
290 * mount of the same dataset will fail to unique_insert the fsid. This
291 * failure would manifest itself as the fsid of this dataset changing
292 * between mounts which makes NFS clients quite unhappy.
293 */
294 static void
295 dsl_dataset_evict_sync(void *dbu)
296 {
297 dsl_dataset_t *ds = dbu;
298
299 ASSERT(ds->ds_owner == NULL);
300
301 unique_remove(ds->ds_fsid_guid);
302 }
303
304 static void
305 dsl_dataset_evict_async(void *dbu)
306 {
307 dsl_dataset_t *ds = dbu;
308
309 ASSERT(ds->ds_owner == NULL);
310
311 ds->ds_dbuf = NULL;
312
313 if (ds->ds_objset != NULL)
314 dmu_objset_evict(ds->ds_objset);
315
316 if (ds->ds_prev) {
317 dsl_dataset_rele(ds->ds_prev, ds);
318 ds->ds_prev = NULL;
319 }
320
321 bplist_destroy(&ds->ds_pending_deadlist);
322 if (dsl_deadlist_is_open(&ds->ds_deadlist))
323 dsl_deadlist_close(&ds->ds_deadlist);
324 if (dsl_deadlist_is_open(&ds->ds_remap_deadlist))
325 dsl_deadlist_close(&ds->ds_remap_deadlist);
326 if (ds->ds_dir)
327 dsl_dir_async_rele(ds->ds_dir, ds);
328
329 ASSERT(!list_link_active(&ds->ds_synced_link));
330
331 list_destroy(&ds->ds_prop_cbs);
332 mutex_destroy(&ds->ds_lock);
333 mutex_destroy(&ds->ds_opening_lock);
334 mutex_destroy(&ds->ds_sendstream_lock);
335 mutex_destroy(&ds->ds_remap_deadlist_lock);
336 refcount_destroy(&ds->ds_longholds);
337 rrw_destroy(&ds->ds_bp_rwlock);
338
339 kmem_free(ds, sizeof (dsl_dataset_t));
340 }
341
342 int
343 dsl_dataset_get_snapname(dsl_dataset_t *ds)
344 {
345 dsl_dataset_phys_t *headphys;
346 int err;
347 dmu_buf_t *headdbuf;
348 dsl_pool_t *dp = ds->ds_dir->dd_pool;
349 objset_t *mos = dp->dp_meta_objset;
350
351 if (ds->ds_snapname[0])
352 return (0);
353 if (dsl_dataset_phys(ds)->ds_next_snap_obj == 0)
354 return (0);
355
356 err = dmu_bonus_hold(mos, dsl_dir_phys(ds->ds_dir)->dd_head_dataset_obj,
357 FTAG, &headdbuf);
358 if (err != 0)
359 return (err);
360 headphys = headdbuf->db_data;
361 err = zap_value_search(dp->dp_meta_objset,
362 headphys->ds_snapnames_zapobj, ds->ds_object, 0, ds->ds_snapname);
363 dmu_buf_rele(headdbuf, FTAG);
364 return (err);
365 }
366
367 int
368 dsl_dataset_snap_lookup(dsl_dataset_t *ds, const char *name, uint64_t *value)
369 {
370 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
371 uint64_t snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj;
372 matchtype_t mt = 0;
373 int err;
374
375 if (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_CI_DATASET)
376 mt = MT_NORMALIZE;
377
378 err = zap_lookup_norm(mos, snapobj, name, 8, 1,
379 value, mt, NULL, 0, NULL);
380 if (err == ENOTSUP && (mt & MT_NORMALIZE))
381 err = zap_lookup(mos, snapobj, name, 8, 1, value);
382 return (err);
383 }
384
385 int
386 dsl_dataset_snap_remove(dsl_dataset_t *ds, const char *name, dmu_tx_t *tx,
387 boolean_t adj_cnt)
388 {
389 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
390 uint64_t snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj;
391 matchtype_t mt = 0;
392 int err;
393
394 dsl_dir_snap_cmtime_update(ds->ds_dir);
395
396 if (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_CI_DATASET)
397 mt = MT_NORMALIZE;
398
399 err = zap_remove_norm(mos, snapobj, name, mt, tx);
400 if (err == ENOTSUP && (mt & MT_NORMALIZE))
401 err = zap_remove(mos, snapobj, name, tx);
402
403 if (err == 0 && adj_cnt)
404 dsl_fs_ss_count_adjust(ds->ds_dir, -1,
405 DD_FIELD_SNAPSHOT_COUNT, tx);
406
407 return (err);
408 }
409
410 boolean_t
411 dsl_dataset_try_add_ref(dsl_pool_t *dp, dsl_dataset_t *ds, void *tag)
412 {
413 dmu_buf_t *dbuf = ds->ds_dbuf;
414 boolean_t result = B_FALSE;
415
416 if (dbuf != NULL && dmu_buf_try_add_ref(dbuf, dp->dp_meta_objset,
417 ds->ds_object, DMU_BONUS_BLKID, tag)) {
418
419 if (ds == dmu_buf_get_user(dbuf))
420 result = B_TRUE;
421 else
422 dmu_buf_rele(dbuf, tag);
423 }
424
425 return (result);
426 }
427
428 int
429 dsl_dataset_hold_obj(dsl_pool_t *dp, uint64_t dsobj, void *tag,
430 dsl_dataset_t **dsp)
431 {
432 objset_t *mos = dp->dp_meta_objset;
433 dmu_buf_t *dbuf;
434 dsl_dataset_t *ds;
435 int err;
436 dmu_object_info_t doi;
437
438 ASSERT(dsl_pool_config_held(dp));
439
440 err = dmu_bonus_hold(mos, dsobj, tag, &dbuf);
441 if (err != 0)
442 return (err);
443
444 /* Make sure dsobj has the correct object type. */
445 dmu_object_info_from_db(dbuf, &doi);
446 if (doi.doi_bonus_type != DMU_OT_DSL_DATASET) {
447 dmu_buf_rele(dbuf, tag);
448 return (SET_ERROR(EINVAL));
449 }
450
451 ds = dmu_buf_get_user(dbuf);
452 if (ds == NULL) {
453 dsl_dataset_t *winner = NULL;
454
455 ds = kmem_zalloc(sizeof (dsl_dataset_t), KM_SLEEP);
456 ds->ds_dbuf = dbuf;
457 ds->ds_object = dsobj;
458 ds->ds_is_snapshot = dsl_dataset_phys(ds)->ds_num_children != 0;
459
460 err = dsl_dir_hold_obj(dp, dsl_dataset_phys(ds)->ds_dir_obj,
461 NULL, ds, &ds->ds_dir);
462 if (err != 0) {
463 kmem_free(ds, sizeof (dsl_dataset_t));
464 dmu_buf_rele(dbuf, tag);
465 return (err);
466 }
467
468 mutex_init(&ds->ds_lock, NULL, MUTEX_DEFAULT, NULL);
469 mutex_init(&ds->ds_opening_lock, NULL, MUTEX_DEFAULT, NULL);
470 mutex_init(&ds->ds_sendstream_lock, NULL, MUTEX_DEFAULT, NULL);
471 mutex_init(&ds->ds_remap_deadlist_lock,
472 NULL, MUTEX_DEFAULT, NULL);
473 rrw_init(&ds->ds_bp_rwlock, B_FALSE);
474 refcount_create(&ds->ds_longholds);
475
476 bplist_create(&ds->ds_pending_deadlist);
477
478 list_create(&ds->ds_sendstreams, sizeof (dmu_sendarg_t),
479 offsetof(dmu_sendarg_t, dsa_link));
480
481 list_create(&ds->ds_prop_cbs, sizeof (dsl_prop_cb_record_t),
482 offsetof(dsl_prop_cb_record_t, cbr_ds_node));
483
484 if (doi.doi_type == DMU_OTN_ZAP_METADATA) {
485 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) {
486 if (!(spa_feature_table[f].fi_flags &
487 ZFEATURE_FLAG_PER_DATASET))
488 continue;
489 err = zap_contains(mos, dsobj,
490 spa_feature_table[f].fi_guid);
491 if (err == 0) {
492 ds->ds_feature_inuse[f] = B_TRUE;
493 } else {
494 ASSERT3U(err, ==, ENOENT);
495 err = 0;
496 }
497 }
498 }
499
500 if (!ds->ds_is_snapshot) {
501 ds->ds_snapname[0] = '\0';
502 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) {
503 err = dsl_dataset_hold_obj(dp,
504 dsl_dataset_phys(ds)->ds_prev_snap_obj,
505 ds, &ds->ds_prev);
506 }
507 if (doi.doi_type == DMU_OTN_ZAP_METADATA) {
508 int zaperr = zap_lookup(mos, ds->ds_object,
509 DS_FIELD_BOOKMARK_NAMES,
510 sizeof (ds->ds_bookmarks), 1,
511 &ds->ds_bookmarks);
512 if (zaperr != ENOENT)
513 VERIFY0(zaperr);
514 }
515 } else {
516 if (zfs_flags & ZFS_DEBUG_SNAPNAMES)
517 err = dsl_dataset_get_snapname(ds);
518 if (err == 0 &&
519 dsl_dataset_phys(ds)->ds_userrefs_obj != 0) {
520 err = zap_count(
521 ds->ds_dir->dd_pool->dp_meta_objset,
522 dsl_dataset_phys(ds)->ds_userrefs_obj,
523 &ds->ds_userrefs);
524 }
525 }
526
527 if (err == 0 && !ds->ds_is_snapshot) {
528 err = dsl_prop_get_int_ds(ds,
529 zfs_prop_to_name(ZFS_PROP_REFRESERVATION),
530 &ds->ds_reserved);
531 if (err == 0) {
532 err = dsl_prop_get_int_ds(ds,
533 zfs_prop_to_name(ZFS_PROP_REFQUOTA),
534 &ds->ds_quota);
535 }
536 } else {
537 ds->ds_reserved = ds->ds_quota = 0;
538 }
539
540 dsl_deadlist_open(&ds->ds_deadlist,
541 mos, dsl_dataset_phys(ds)->ds_deadlist_obj);
542 uint64_t remap_deadlist_obj =
543 dsl_dataset_get_remap_deadlist_object(ds);
544 if (remap_deadlist_obj != 0) {
545 dsl_deadlist_open(&ds->ds_remap_deadlist, mos,
546 remap_deadlist_obj);
547 }
548
549 dmu_buf_init_user(&ds->ds_dbu, dsl_dataset_evict_sync,
550 dsl_dataset_evict_async, &ds->ds_dbuf);
551 if (err == 0)
552 winner = dmu_buf_set_user_ie(dbuf, &ds->ds_dbu);
553
554 if (err != 0 || winner != NULL) {
555 bplist_destroy(&ds->ds_pending_deadlist);
556 dsl_deadlist_close(&ds->ds_deadlist);
557 if (dsl_deadlist_is_open(&ds->ds_remap_deadlist))
558 dsl_deadlist_close(&ds->ds_remap_deadlist);
559 if (ds->ds_prev)
560 dsl_dataset_rele(ds->ds_prev, ds);
561 dsl_dir_rele(ds->ds_dir, ds);
562 mutex_destroy(&ds->ds_lock);
563 mutex_destroy(&ds->ds_opening_lock);
564 mutex_destroy(&ds->ds_sendstream_lock);
565 refcount_destroy(&ds->ds_longholds);
566 kmem_free(ds, sizeof (dsl_dataset_t));
567 if (err != 0) {
568 dmu_buf_rele(dbuf, tag);
569 return (err);
570 }
571 ds = winner;
572 } else {
573 ds->ds_fsid_guid =
574 unique_insert(dsl_dataset_phys(ds)->ds_fsid_guid);
575 if (ds->ds_fsid_guid !=
576 dsl_dataset_phys(ds)->ds_fsid_guid) {
577 zfs_dbgmsg("ds_fsid_guid changed from "
578 "%llx to %llx for pool %s dataset id %llu",
579 (long long)
580 dsl_dataset_phys(ds)->ds_fsid_guid,
581 (long long)ds->ds_fsid_guid,
582 spa_name(dp->dp_spa),
583 dsobj);
584 }
585 }
586 }
587 ASSERT3P(ds->ds_dbuf, ==, dbuf);
588 ASSERT3P(dsl_dataset_phys(ds), ==, dbuf->db_data);
589 ASSERT(dsl_dataset_phys(ds)->ds_prev_snap_obj != 0 ||
590 spa_version(dp->dp_spa) < SPA_VERSION_ORIGIN ||
591 dp->dp_origin_snap == NULL || ds == dp->dp_origin_snap);
592 *dsp = ds;
593 return (0);
594 }
595
596 int
597 dsl_dataset_hold(dsl_pool_t *dp, const char *name,
598 void *tag, dsl_dataset_t **dsp)
599 {
600 dsl_dir_t *dd;
601 const char *snapname;
602 uint64_t obj;
603 int err = 0;
604 dsl_dataset_t *ds;
605
606 err = dsl_dir_hold(dp, name, FTAG, &dd, &snapname);
607 if (err != 0)
608 return (err);
609
610 ASSERT(dsl_pool_config_held(dp));
611 obj = dsl_dir_phys(dd)->dd_head_dataset_obj;
612 if (obj != 0)
613 err = dsl_dataset_hold_obj(dp, obj, tag, &ds);
614 else
615 err = SET_ERROR(ENOENT);
616
617 /* we may be looking for a snapshot */
618 if (err == 0 && snapname != NULL) {
619 dsl_dataset_t *snap_ds;
620
621 if (*snapname++ != '@') {
622 dsl_dataset_rele(ds, tag);
623 dsl_dir_rele(dd, FTAG);
624 return (SET_ERROR(ENOENT));
625 }
626
627 dprintf("looking for snapshot '%s'\n", snapname);
628 err = dsl_dataset_snap_lookup(ds, snapname, &obj);
629 if (err == 0)
630 err = dsl_dataset_hold_obj(dp, obj, tag, &snap_ds);
631 dsl_dataset_rele(ds, tag);
632
633 if (err == 0) {
634 mutex_enter(&snap_ds->ds_lock);
635 if (snap_ds->ds_snapname[0] == 0)
636 (void) strlcpy(snap_ds->ds_snapname, snapname,
637 sizeof (snap_ds->ds_snapname));
638 mutex_exit(&snap_ds->ds_lock);
639 ds = snap_ds;
640 }
641 }
642 if (err == 0)
643 *dsp = ds;
644 dsl_dir_rele(dd, FTAG);
645 return (err);
646 }
647
648 int
649 dsl_dataset_own_obj(dsl_pool_t *dp, uint64_t dsobj,
650 void *tag, dsl_dataset_t **dsp)
651 {
652 int err = dsl_dataset_hold_obj(dp, dsobj, tag, dsp);
653 if (err != 0)
654 return (err);
655 if (!dsl_dataset_tryown(*dsp, tag)) {
656 dsl_dataset_rele(*dsp, tag);
657 *dsp = NULL;
658 return (SET_ERROR(EBUSY));
659 }
660 return (0);
661 }
662
663 int
664 dsl_dataset_own(dsl_pool_t *dp, const char *name,
665 void *tag, dsl_dataset_t **dsp)
666 {
667 int err = dsl_dataset_hold(dp, name, tag, dsp);
668 if (err != 0)
669 return (err);
670 if (!dsl_dataset_tryown(*dsp, tag)) {
671 dsl_dataset_rele(*dsp, tag);
672 return (SET_ERROR(EBUSY));
673 }
674 return (0);
675 }
676
677 /*
678 * See the comment above dsl_pool_hold() for details. In summary, a long
679 * hold is used to prevent destruction of a dataset while the pool hold
680 * is dropped, allowing other concurrent operations (e.g. spa_sync()).
681 *
682 * The dataset and pool must be held when this function is called. After it
683 * is called, the pool hold may be released while the dataset is still held
684 * and accessed.
685 */
686 void
687 dsl_dataset_long_hold(dsl_dataset_t *ds, void *tag)
688 {
689 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool));
690 (void) refcount_add(&ds->ds_longholds, tag);
691 }
692
693 void
694 dsl_dataset_long_rele(dsl_dataset_t *ds, void *tag)
695 {
696 (void) refcount_remove(&ds->ds_longholds, tag);
697 }
698
699 /* Return B_TRUE if there are any long holds on this dataset. */
700 boolean_t
701 dsl_dataset_long_held(dsl_dataset_t *ds)
702 {
703 return (!refcount_is_zero(&ds->ds_longholds));
704 }
705
706 void
707 dsl_dataset_name(dsl_dataset_t *ds, char *name)
708 {
709 if (ds == NULL) {
710 (void) strcpy(name, "mos");
711 } else {
712 dsl_dir_name(ds->ds_dir, name);
713 VERIFY0(dsl_dataset_get_snapname(ds));
714 if (ds->ds_snapname[0]) {
715 VERIFY3U(strlcat(name, "@", ZFS_MAX_DATASET_NAME_LEN),
716 <, ZFS_MAX_DATASET_NAME_LEN);
717 /*
718 * We use a "recursive" mutex so that we
719 * can call dprintf_ds() with ds_lock held.
720 */
721 if (!MUTEX_HELD(&ds->ds_lock)) {
722 mutex_enter(&ds->ds_lock);
723 VERIFY3U(strlcat(name, ds->ds_snapname,
724 ZFS_MAX_DATASET_NAME_LEN), <,
725 ZFS_MAX_DATASET_NAME_LEN);
726 mutex_exit(&ds->ds_lock);
727 } else {
728 VERIFY3U(strlcat(name, ds->ds_snapname,
729 ZFS_MAX_DATASET_NAME_LEN), <,
730 ZFS_MAX_DATASET_NAME_LEN);
731 }
732 }
733 }
734 }
735
736 int
737 dsl_dataset_namelen(dsl_dataset_t *ds)
738 {
739 VERIFY0(dsl_dataset_get_snapname(ds));
740 mutex_enter(&ds->ds_lock);
741 int len = dsl_dir_namelen(ds->ds_dir) + 1 + strlen(ds->ds_snapname);
742 mutex_exit(&ds->ds_lock);
743 return (len);
744 }
745
746 void
747 dsl_dataset_rele(dsl_dataset_t *ds, void *tag)
748 {
749 dmu_buf_rele(ds->ds_dbuf, tag);
750 }
751
752 void
753 dsl_dataset_disown(dsl_dataset_t *ds, void *tag)
754 {
755 ASSERT3P(ds->ds_owner, ==, tag);
756 ASSERT(ds->ds_dbuf != NULL);
757
758 mutex_enter(&ds->ds_lock);
759 ds->ds_owner = NULL;
760 mutex_exit(&ds->ds_lock);
761 dsl_dataset_long_rele(ds, tag);
762 dsl_dataset_rele(ds, tag);
763 }
764
765 boolean_t
766 dsl_dataset_tryown(dsl_dataset_t *ds, void *tag)
767 {
768 boolean_t gotit = FALSE;
769
770 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool));
771 mutex_enter(&ds->ds_lock);
772 if (ds->ds_owner == NULL && !DS_IS_INCONSISTENT(ds)) {
773 ds->ds_owner = tag;
774 dsl_dataset_long_hold(ds, tag);
775 gotit = TRUE;
776 }
777 mutex_exit(&ds->ds_lock);
778 return (gotit);
779 }
780
781 boolean_t
782 dsl_dataset_has_owner(dsl_dataset_t *ds)
783 {
784 boolean_t rv;
785 mutex_enter(&ds->ds_lock);
786 rv = (ds->ds_owner != NULL);
787 mutex_exit(&ds->ds_lock);
788 return (rv);
789 }
790
791 static void
792 dsl_dataset_activate_feature(uint64_t dsobj, spa_feature_t f, dmu_tx_t *tx)
793 {
794 spa_t *spa = dmu_tx_pool(tx)->dp_spa;
795 objset_t *mos = dmu_tx_pool(tx)->dp_meta_objset;
796 uint64_t zero = 0;
797
798 VERIFY(spa_feature_table[f].fi_flags & ZFEATURE_FLAG_PER_DATASET);
799
800 spa_feature_incr(spa, f, tx);
801 dmu_object_zapify(mos, dsobj, DMU_OT_DSL_DATASET, tx);
802
803 VERIFY0(zap_add(mos, dsobj, spa_feature_table[f].fi_guid,
804 sizeof (zero), 1, &zero, tx));
805 }
806
807 void
808 dsl_dataset_deactivate_feature(uint64_t dsobj, spa_feature_t f, dmu_tx_t *tx)
809 {
810 spa_t *spa = dmu_tx_pool(tx)->dp_spa;
811 objset_t *mos = dmu_tx_pool(tx)->dp_meta_objset;
812
813 VERIFY(spa_feature_table[f].fi_flags & ZFEATURE_FLAG_PER_DATASET);
814
815 VERIFY0(zap_remove(mos, dsobj, spa_feature_table[f].fi_guid, tx));
816 spa_feature_decr(spa, f, tx);
817 }
818
819 uint64_t
820 dsl_dataset_create_sync_dd(dsl_dir_t *dd, dsl_dataset_t *origin,
821 uint64_t flags, dmu_tx_t *tx)
822 {
823 dsl_pool_t *dp = dd->dd_pool;
824 dmu_buf_t *dbuf;
825 dsl_dataset_phys_t *dsphys;
826 uint64_t dsobj;
827 objset_t *mos = dp->dp_meta_objset;
828
829 if (origin == NULL)
830 origin = dp->dp_origin_snap;
831
832 ASSERT(origin == NULL || origin->ds_dir->dd_pool == dp);
833 ASSERT(origin == NULL || dsl_dataset_phys(origin)->ds_num_children > 0);
834 ASSERT(dmu_tx_is_syncing(tx));
835 ASSERT(dsl_dir_phys(dd)->dd_head_dataset_obj == 0);
836
837 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0,
838 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx);
839 VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf));
840 dmu_buf_will_dirty(dbuf, tx);
841 dsphys = dbuf->db_data;
842 bzero(dsphys, sizeof (dsl_dataset_phys_t));
843 dsphys->ds_dir_obj = dd->dd_object;
844 dsphys->ds_flags = flags;
845 dsphys->ds_fsid_guid = unique_create();
846 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid,
847 sizeof (dsphys->ds_guid));
848 dsphys->ds_snapnames_zapobj =
849 zap_create_norm(mos, U8_TEXTPREP_TOUPPER, DMU_OT_DSL_DS_SNAP_MAP,
850 DMU_OT_NONE, 0, tx);
851 dsphys->ds_creation_time = gethrestime_sec();
852 dsphys->ds_creation_txg = tx->tx_txg == TXG_INITIAL ? 1 : tx->tx_txg;
853
854 if (origin == NULL) {
855 dsphys->ds_deadlist_obj = dsl_deadlist_alloc(mos, tx);
856 } else {
857 dsl_dataset_t *ohds; /* head of the origin snapshot */
858
859 dsphys->ds_prev_snap_obj = origin->ds_object;
860 dsphys->ds_prev_snap_txg =
861 dsl_dataset_phys(origin)->ds_creation_txg;
862 dsphys->ds_referenced_bytes =
863 dsl_dataset_phys(origin)->ds_referenced_bytes;
864 dsphys->ds_compressed_bytes =
865 dsl_dataset_phys(origin)->ds_compressed_bytes;
866 dsphys->ds_uncompressed_bytes =
867 dsl_dataset_phys(origin)->ds_uncompressed_bytes;
868 rrw_enter(&origin->ds_bp_rwlock, RW_READER, FTAG);
869 dsphys->ds_bp = dsl_dataset_phys(origin)->ds_bp;
870 rrw_exit(&origin->ds_bp_rwlock, FTAG);
871
872 /*
873 * Inherit flags that describe the dataset's contents
874 * (INCONSISTENT) or properties (Case Insensitive).
875 */
876 dsphys->ds_flags |= dsl_dataset_phys(origin)->ds_flags &
877 (DS_FLAG_INCONSISTENT | DS_FLAG_CI_DATASET);
878
879 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) {
880 if (origin->ds_feature_inuse[f])
881 dsl_dataset_activate_feature(dsobj, f, tx);
882 }
883
884 dmu_buf_will_dirty(origin->ds_dbuf, tx);
885 dsl_dataset_phys(origin)->ds_num_children++;
886
887 VERIFY0(dsl_dataset_hold_obj(dp,
888 dsl_dir_phys(origin->ds_dir)->dd_head_dataset_obj,
889 FTAG, &ohds));
890 dsphys->ds_deadlist_obj = dsl_deadlist_clone(&ohds->ds_deadlist,
891 dsphys->ds_prev_snap_txg, dsphys->ds_prev_snap_obj, tx);
892 dsl_dataset_rele(ohds, FTAG);
893
894 if (spa_version(dp->dp_spa) >= SPA_VERSION_NEXT_CLONES) {
895 if (dsl_dataset_phys(origin)->ds_next_clones_obj == 0) {
896 dsl_dataset_phys(origin)->ds_next_clones_obj =
897 zap_create(mos,
898 DMU_OT_NEXT_CLONES, DMU_OT_NONE, 0, tx);
899 }
900 VERIFY0(zap_add_int(mos,
901 dsl_dataset_phys(origin)->ds_next_clones_obj,
902 dsobj, tx));
903 }
904
905 dmu_buf_will_dirty(dd->dd_dbuf, tx);
906 dsl_dir_phys(dd)->dd_origin_obj = origin->ds_object;
907 if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) {
908 if (dsl_dir_phys(origin->ds_dir)->dd_clones == 0) {
909 dmu_buf_will_dirty(origin->ds_dir->dd_dbuf, tx);
910 dsl_dir_phys(origin->ds_dir)->dd_clones =
911 zap_create(mos,
912 DMU_OT_DSL_CLONES, DMU_OT_NONE, 0, tx);
913 }
914 VERIFY0(zap_add_int(mos,
915 dsl_dir_phys(origin->ds_dir)->dd_clones,
916 dsobj, tx));
917 }
918 }
919
920 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE)
921 dsphys->ds_flags |= DS_FLAG_UNIQUE_ACCURATE;
922
923 dmu_buf_rele(dbuf, FTAG);
924
925 dmu_buf_will_dirty(dd->dd_dbuf, tx);
926 dsl_dir_phys(dd)->dd_head_dataset_obj = dsobj;
927
928 return (dsobj);
929 }
930
931 static void
932 dsl_dataset_zero_zil(dsl_dataset_t *ds, dmu_tx_t *tx)
933 {
934 objset_t *os;
935
936 VERIFY0(dmu_objset_from_ds(ds, &os));
937 if (bcmp(&os->os_zil_header, &zero_zil, sizeof (zero_zil)) != 0) {
938 dsl_pool_t *dp = ds->ds_dir->dd_pool;
939 zio_t *zio;
940
941 bzero(&os->os_zil_header, sizeof (os->os_zil_header));
942
943 zio = zio_root(dp->dp_spa, NULL, NULL, ZIO_FLAG_MUSTSUCCEED);
944 dsl_dataset_sync(ds, zio, tx);
945 VERIFY0(zio_wait(zio));
946
947 /* dsl_dataset_sync_done will drop this reference. */
948 dmu_buf_add_ref(ds->ds_dbuf, ds);
949 dsl_dataset_sync_done(ds, tx);
950 }
951 }
952
953 uint64_t
954 dsl_dataset_create_sync(dsl_dir_t *pdd, const char *lastname,
955 dsl_dataset_t *origin, uint64_t flags, cred_t *cr, dmu_tx_t *tx)
956 {
957 dsl_pool_t *dp = pdd->dd_pool;
958 uint64_t dsobj, ddobj;
959 dsl_dir_t *dd;
960
961 ASSERT(dmu_tx_is_syncing(tx));
962 ASSERT(lastname[0] != '@');
963
964 ddobj = dsl_dir_create_sync(dp, pdd, lastname, tx);
965 VERIFY0(dsl_dir_hold_obj(dp, ddobj, lastname, FTAG, &dd));
966
967 dsobj = dsl_dataset_create_sync_dd(dd, origin,
968 flags & ~DS_CREATE_FLAG_NODIRTY, tx);
969
970 dsl_deleg_set_create_perms(dd, tx, cr);
971
972 /*
973 * Since we're creating a new node we know it's a leaf, so we can
974 * initialize the counts if the limit feature is active.
975 */
976 if (spa_feature_is_active(dp->dp_spa, SPA_FEATURE_FS_SS_LIMIT)) {
977 uint64_t cnt = 0;
978 objset_t *os = dd->dd_pool->dp_meta_objset;
979
980 dsl_dir_zapify(dd, tx);
981 VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_FILESYSTEM_COUNT,
982 sizeof (cnt), 1, &cnt, tx));
983 VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_SNAPSHOT_COUNT,
984 sizeof (cnt), 1, &cnt, tx));
985 }
986
987 dsl_dir_rele(dd, FTAG);
988
989 /*
990 * If we are creating a clone, make sure we zero out any stale
991 * data from the origin snapshots zil header.
992 */
993 if (origin != NULL && !(flags & DS_CREATE_FLAG_NODIRTY)) {
994 dsl_dataset_t *ds;
995
996 VERIFY0(dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds));
997 dsl_dataset_zero_zil(ds, tx);
998 dsl_dataset_rele(ds, FTAG);
999 }
1000
1001 return (dsobj);
1002 }
1003
1004 /*
1005 * The unique space in the head dataset can be calculated by subtracting
1006 * the space used in the most recent snapshot, that is still being used
1007 * in this file system, from the space currently in use. To figure out
1008 * the space in the most recent snapshot still in use, we need to take
1009 * the total space used in the snapshot and subtract out the space that
1010 * has been freed up since the snapshot was taken.
1011 */
1012 void
1013 dsl_dataset_recalc_head_uniq(dsl_dataset_t *ds)
1014 {
1015 uint64_t mrs_used;
1016 uint64_t dlused, dlcomp, dluncomp;
1017
1018 ASSERT(!ds->ds_is_snapshot);
1019
1020 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0)
1021 mrs_used = dsl_dataset_phys(ds->ds_prev)->ds_referenced_bytes;
1022 else
1023 mrs_used = 0;
1024
1025 dsl_deadlist_space(&ds->ds_deadlist, &dlused, &dlcomp, &dluncomp);
1026
1027 ASSERT3U(dlused, <=, mrs_used);
1028 dsl_dataset_phys(ds)->ds_unique_bytes =
1029 dsl_dataset_phys(ds)->ds_referenced_bytes - (mrs_used - dlused);
1030
1031 if (spa_version(ds->ds_dir->dd_pool->dp_spa) >=
1032 SPA_VERSION_UNIQUE_ACCURATE)
1033 dsl_dataset_phys(ds)->ds_flags |= DS_FLAG_UNIQUE_ACCURATE;
1034 }
1035
1036 void
1037 dsl_dataset_remove_from_next_clones(dsl_dataset_t *ds, uint64_t obj,
1038 dmu_tx_t *tx)
1039 {
1040 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
1041 uint64_t count;
1042 int err;
1043
1044 ASSERT(dsl_dataset_phys(ds)->ds_num_children >= 2);
1045 err = zap_remove_int(mos, dsl_dataset_phys(ds)->ds_next_clones_obj,
1046 obj, tx);
1047 /*
1048 * The err should not be ENOENT, but a bug in a previous version
1049 * of the code could cause upgrade_clones_cb() to not set
1050 * ds_next_snap_obj when it should, leading to a missing entry.
1051 * If we knew that the pool was created after
1052 * SPA_VERSION_NEXT_CLONES, we could assert that it isn't
1053 * ENOENT. However, at least we can check that we don't have
1054 * too many entries in the next_clones_obj even after failing to
1055 * remove this one.
1056 */
1057 if (err != ENOENT)
1058 VERIFY0(err);
1059 ASSERT0(zap_count(mos, dsl_dataset_phys(ds)->ds_next_clones_obj,
1060 &count));
1061 ASSERT3U(count, <=, dsl_dataset_phys(ds)->ds_num_children - 2);
1062 }
1063
1064
1065 blkptr_t *
1066 dsl_dataset_get_blkptr(dsl_dataset_t *ds)
1067 {
1068 return (&dsl_dataset_phys(ds)->ds_bp);
1069 }
1070
1071 spa_t *
1072 dsl_dataset_get_spa(dsl_dataset_t *ds)
1073 {
1074 return (ds->ds_dir->dd_pool->dp_spa);
1075 }
1076
1077 void
1078 dsl_dataset_dirty(dsl_dataset_t *ds, dmu_tx_t *tx)
1079 {
1080 dsl_pool_t *dp;
1081
1082 if (ds == NULL) /* this is the meta-objset */
1083 return;
1084
1085 ASSERT(ds->ds_objset != NULL);
1086
1087 if (dsl_dataset_phys(ds)->ds_next_snap_obj != 0)
1088 panic("dirtying snapshot!");
1089
1090 /* Must not dirty a dataset in the same txg where it got snapshotted. */
1091 ASSERT3U(tx->tx_txg, >, dsl_dataset_phys(ds)->ds_prev_snap_txg);
1092
1093 dp = ds->ds_dir->dd_pool;
1094 if (txg_list_add(&dp->dp_dirty_datasets, ds, tx->tx_txg)) {
1095 /* up the hold count until we can be written out */
1096 dmu_buf_add_ref(ds->ds_dbuf, ds);
1097 }
1098 }
1099
1100 boolean_t
1101 dsl_dataset_is_dirty(dsl_dataset_t *ds)
1102 {
1103 for (int t = 0; t < TXG_SIZE; t++) {
1104 if (txg_list_member(&ds->ds_dir->dd_pool->dp_dirty_datasets,
1105 ds, t))
1106 return (B_TRUE);
1107 }
1108 return (B_FALSE);
1109 }
1110
1111 static int
1112 dsl_dataset_snapshot_reserve_space(dsl_dataset_t *ds, dmu_tx_t *tx)
1113 {
1114 uint64_t asize;
1115
1116 if (!dmu_tx_is_syncing(tx))
1117 return (0);
1118
1119 /*
1120 * If there's an fs-only reservation, any blocks that might become
1121 * owned by the snapshot dataset must be accommodated by space
1122 * outside of the reservation.
1123 */
1124 ASSERT(ds->ds_reserved == 0 || DS_UNIQUE_IS_ACCURATE(ds));
1125 asize = MIN(dsl_dataset_phys(ds)->ds_unique_bytes, ds->ds_reserved);
1126 if (asize > dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE))
1127 return (SET_ERROR(ENOSPC));
1128
1129 /*
1130 * Propagate any reserved space for this snapshot to other
1131 * snapshot checks in this sync group.
1132 */
1133 if (asize > 0)
1134 dsl_dir_willuse_space(ds->ds_dir, asize, tx);
1135
1136 return (0);
1137 }
1138
1139 int
1140 dsl_dataset_snapshot_check_impl(dsl_dataset_t *ds, const char *snapname,
1141 dmu_tx_t *tx, boolean_t recv, uint64_t cnt, cred_t *cr)
1142 {
1143 int error;
1144 uint64_t value;
1145
1146 ds->ds_trysnap_txg = tx->tx_txg;
1147
1148 if (!dmu_tx_is_syncing(tx))
1149 return (0);
1150
1151 /*
1152 * We don't allow multiple snapshots of the same txg. If there
1153 * is already one, try again.
1154 */
1155 if (dsl_dataset_phys(ds)->ds_prev_snap_txg >= tx->tx_txg)
1156 return (SET_ERROR(EAGAIN));
1157
1158 /*
1159 * Check for conflicting snapshot name.
1160 */
1161 error = dsl_dataset_snap_lookup(ds, snapname, &value);
1162 if (error == 0)
1163 return (SET_ERROR(EEXIST));
1164 if (error != ENOENT)
1165 return (error);
1166
1167 /*
1168 * We don't allow taking snapshots of inconsistent datasets, such as
1169 * those into which we are currently receiving. However, if we are
1170 * creating this snapshot as part of a receive, this check will be
1171 * executed atomically with respect to the completion of the receive
1172 * itself but prior to the clearing of DS_FLAG_INCONSISTENT; in this
1173 * case we ignore this, knowing it will be fixed up for us shortly in
1174 * dmu_recv_end_sync().
1175 */
1176 if (!recv && DS_IS_INCONSISTENT(ds))
1177 return (SET_ERROR(EBUSY));
1178
1179 /*
1180 * Skip the check for temporary snapshots or if we have already checked
1181 * the counts in dsl_dataset_snapshot_check. This means we really only
1182 * check the count here when we're receiving a stream.
1183 */
1184 if (cnt != 0 && cr != NULL) {
1185 error = dsl_fs_ss_limit_check(ds->ds_dir, cnt,
1186 ZFS_PROP_SNAPSHOT_LIMIT, NULL, cr);
1187 if (error != 0)
1188 return (error);
1189 }
1190
1191 error = dsl_dataset_snapshot_reserve_space(ds, tx);
1192 if (error != 0)
1193 return (error);
1194
1195 return (0);
1196 }
1197
1198 int
1199 dsl_dataset_snapshot_check(void *arg, dmu_tx_t *tx)
1200 {
1201 dsl_dataset_snapshot_arg_t *ddsa = arg;
1202 dsl_pool_t *dp = dmu_tx_pool(tx);
1203 nvpair_t *pair;
1204 int rv = 0;
1205
1206 /*
1207 * Pre-compute how many total new snapshots will be created for each
1208 * level in the tree and below. This is needed for validating the
1209 * snapshot limit when either taking a recursive snapshot or when
1210 * taking multiple snapshots.
1211 *
1212 * The problem is that the counts are not actually adjusted when
1213 * we are checking, only when we finally sync. For a single snapshot,
1214 * this is easy, the count will increase by 1 at each node up the tree,
1215 * but its more complicated for the recursive/multiple snapshot case.
1216 *
1217 * The dsl_fs_ss_limit_check function does recursively check the count
1218 * at each level up the tree but since it is validating each snapshot
1219 * independently we need to be sure that we are validating the complete
1220 * count for the entire set of snapshots. We do this by rolling up the
1221 * counts for each component of the name into an nvlist and then
1222 * checking each of those cases with the aggregated count.
1223 *
1224 * This approach properly handles not only the recursive snapshot
1225 * case (where we get all of those on the ddsa_snaps list) but also
1226 * the sibling case (e.g. snapshot a/b and a/c so that we will also
1227 * validate the limit on 'a' using a count of 2).
1228 *
1229 * We validate the snapshot names in the third loop and only report
1230 * name errors once.
1231 */
1232 if (dmu_tx_is_syncing(tx)) {
1233 nvlist_t *cnt_track = NULL;
1234 cnt_track = fnvlist_alloc();
1235
1236 /* Rollup aggregated counts into the cnt_track list */
1237 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL);
1238 pair != NULL;
1239 pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) {
1240 char *pdelim;
1241 uint64_t val;
1242 char nm[MAXPATHLEN];
1243
1244 (void) strlcpy(nm, nvpair_name(pair), sizeof (nm));
1245 pdelim = strchr(nm, '@');
1246 if (pdelim == NULL)
1247 continue;
1248 *pdelim = '\0';
1249
1250 do {
1251 if (nvlist_lookup_uint64(cnt_track, nm,
1252 &val) == 0) {
1253 /* update existing entry */
1254 fnvlist_add_uint64(cnt_track, nm,
1255 val + 1);
1256 } else {
1257 /* add to list */
1258 fnvlist_add_uint64(cnt_track, nm, 1);
1259 }
1260
1261 pdelim = strrchr(nm, '/');
1262 if (pdelim != NULL)
1263 *pdelim = '\0';
1264 } while (pdelim != NULL);
1265 }
1266
1267 /* Check aggregated counts at each level */
1268 for (pair = nvlist_next_nvpair(cnt_track, NULL);
1269 pair != NULL; pair = nvlist_next_nvpair(cnt_track, pair)) {
1270 int error = 0;
1271 char *name;
1272 uint64_t cnt = 0;
1273 dsl_dataset_t *ds;
1274
1275 name = nvpair_name(pair);
1276 cnt = fnvpair_value_uint64(pair);
1277 ASSERT(cnt > 0);
1278
1279 error = dsl_dataset_hold(dp, name, FTAG, &ds);
1280 if (error == 0) {
1281 error = dsl_fs_ss_limit_check(ds->ds_dir, cnt,
1282 ZFS_PROP_SNAPSHOT_LIMIT, NULL,
1283 ddsa->ddsa_cr);
1284 dsl_dataset_rele(ds, FTAG);
1285 }
1286
1287 if (error != 0) {
1288 if (ddsa->ddsa_errors != NULL)
1289 fnvlist_add_int32(ddsa->ddsa_errors,
1290 name, error);
1291 rv = error;
1292 /* only report one error for this check */
1293 break;
1294 }
1295 }
1296 nvlist_free(cnt_track);
1297 }
1298
1299 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL);
1300 pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) {
1301 int error = 0;
1302 dsl_dataset_t *ds;
1303 char *name, *atp;
1304 char dsname[ZFS_MAX_DATASET_NAME_LEN];
1305
1306 name = nvpair_name(pair);
1307 if (strlen(name) >= ZFS_MAX_DATASET_NAME_LEN)
1308 error = SET_ERROR(ENAMETOOLONG);
1309 if (error == 0) {
1310 atp = strchr(name, '@');
1311 if (atp == NULL)
1312 error = SET_ERROR(EINVAL);
1313 if (error == 0)
1314 (void) strlcpy(dsname, name, atp - name + 1);
1315 }
1316 if (error == 0)
1317 error = dsl_dataset_hold(dp, dsname, FTAG, &ds);
1318 if (error == 0) {
1319 /* passing 0/NULL skips dsl_fs_ss_limit_check */
1320 error = dsl_dataset_snapshot_check_impl(ds,
1321 atp + 1, tx, B_FALSE, 0, NULL);
1322 dsl_dataset_rele(ds, FTAG);
1323 }
1324
1325 if (error != 0) {
1326 if (ddsa->ddsa_errors != NULL) {
1327 fnvlist_add_int32(ddsa->ddsa_errors,
1328 name, error);
1329 }
1330 rv = error;
1331 }
1332 }
1333
1334 return (rv);
1335 }
1336
1337 void
1338 dsl_dataset_snapshot_sync_impl(dsl_dataset_t *ds, const char *snapname,
1339 dmu_tx_t *tx)
1340 {
1341 dsl_pool_t *dp = ds->ds_dir->dd_pool;
1342 dmu_buf_t *dbuf;
1343 dsl_dataset_phys_t *dsphys;
1344 uint64_t dsobj, crtxg;
1345 objset_t *mos = dp->dp_meta_objset;
1346 objset_t *os;
1347
1348 ASSERT(RRW_WRITE_HELD(&dp->dp_config_rwlock));
1349
1350 /*
1351 * If we are on an old pool, the zil must not be active, in which
1352 * case it will be zeroed. Usually zil_suspend() accomplishes this.
1353 */
1354 ASSERT(spa_version(dmu_tx_pool(tx)->dp_spa) >= SPA_VERSION_FAST_SNAP ||
1355 dmu_objset_from_ds(ds, &os) != 0 ||
1356 bcmp(&os->os_phys->os_zil_header, &zero_zil,
1357 sizeof (zero_zil)) == 0);
1358
1359 /* Should not snapshot a dirty dataset. */
1360 ASSERT(!txg_list_member(&ds->ds_dir->dd_pool->dp_dirty_datasets,
1361 ds, tx->tx_txg));
1362
1363 dsl_fs_ss_count_adjust(ds->ds_dir, 1, DD_FIELD_SNAPSHOT_COUNT, tx);
1364
1365 /*
1366 * The origin's ds_creation_txg has to be < TXG_INITIAL
1367 */
1368 if (strcmp(snapname, ORIGIN_DIR_NAME) == 0)
1369 crtxg = 1;
1370 else
1371 crtxg = tx->tx_txg;
1372
1373 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0,
1374 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx);
1375 VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf));
1376 dmu_buf_will_dirty(dbuf, tx);
1377 dsphys = dbuf->db_data;
1378 bzero(dsphys, sizeof (dsl_dataset_phys_t));
1379 dsphys->ds_dir_obj = ds->ds_dir->dd_object;
1380 dsphys->ds_fsid_guid = unique_create();
1381 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid,
1382 sizeof (dsphys->ds_guid));
1383 dsphys->ds_prev_snap_obj = dsl_dataset_phys(ds)->ds_prev_snap_obj;
1384 dsphys->ds_prev_snap_txg = dsl_dataset_phys(ds)->ds_prev_snap_txg;
1385 dsphys->ds_next_snap_obj = ds->ds_object;
1386 dsphys->ds_num_children = 1;
1387 dsphys->ds_creation_time = gethrestime_sec();
1388 dsphys->ds_creation_txg = crtxg;
1389 dsphys->ds_deadlist_obj = dsl_dataset_phys(ds)->ds_deadlist_obj;
1390 dsphys->ds_referenced_bytes = dsl_dataset_phys(ds)->ds_referenced_bytes;
1391 dsphys->ds_compressed_bytes = dsl_dataset_phys(ds)->ds_compressed_bytes;
1392 dsphys->ds_uncompressed_bytes =
1393 dsl_dataset_phys(ds)->ds_uncompressed_bytes;
1394 dsphys->ds_flags = dsl_dataset_phys(ds)->ds_flags;
1395 rrw_enter(&ds->ds_bp_rwlock, RW_READER, FTAG);
1396 dsphys->ds_bp = dsl_dataset_phys(ds)->ds_bp;
1397 rrw_exit(&ds->ds_bp_rwlock, FTAG);
1398 dmu_buf_rele(dbuf, FTAG);
1399
1400 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) {
1401 if (ds->ds_feature_inuse[f])
1402 dsl_dataset_activate_feature(dsobj, f, tx);
1403 }
1404
1405 ASSERT3U(ds->ds_prev != 0, ==,
1406 dsl_dataset_phys(ds)->ds_prev_snap_obj != 0);
1407 if (ds->ds_prev) {
1408 uint64_t next_clones_obj =
1409 dsl_dataset_phys(ds->ds_prev)->ds_next_clones_obj;
1410 ASSERT(dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj ==
1411 ds->ds_object ||
1412 dsl_dataset_phys(ds->ds_prev)->ds_num_children > 1);
1413 if (dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj ==
1414 ds->ds_object) {
1415 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx);
1416 ASSERT3U(dsl_dataset_phys(ds)->ds_prev_snap_txg, ==,
1417 dsl_dataset_phys(ds->ds_prev)->ds_creation_txg);
1418 dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj = dsobj;
1419 } else if (next_clones_obj != 0) {
1420 dsl_dataset_remove_from_next_clones(ds->ds_prev,
1421 dsphys->ds_next_snap_obj, tx);
1422 VERIFY0(zap_add_int(mos,
1423 next_clones_obj, dsobj, tx));
1424 }
1425 }
1426
1427 /*
1428 * If we have a reference-reservation on this dataset, we will
1429 * need to increase the amount of refreservation being charged
1430 * since our unique space is going to zero.
1431 */
1432 if (ds->ds_reserved) {
1433 int64_t delta;
1434 ASSERT(DS_UNIQUE_IS_ACCURATE(ds));
1435 delta = MIN(dsl_dataset_phys(ds)->ds_unique_bytes,
1436 ds->ds_reserved);
1437 dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV,
1438 delta, 0, 0, tx);
1439 }
1440
1441 dmu_buf_will_dirty(ds->ds_dbuf, tx);
1442 dsl_dataset_phys(ds)->ds_deadlist_obj =
1443 dsl_deadlist_clone(&ds->ds_deadlist, UINT64_MAX,
1444 dsl_dataset_phys(ds)->ds_prev_snap_obj, tx);
1445 dsl_deadlist_close(&ds->ds_deadlist);
1446 dsl_deadlist_open(&ds->ds_deadlist, mos,
1447 dsl_dataset_phys(ds)->ds_deadlist_obj);
1448 dsl_deadlist_add_key(&ds->ds_deadlist,
1449 dsl_dataset_phys(ds)->ds_prev_snap_txg, tx);
1450
1451 if (dsl_dataset_remap_deadlist_exists(ds)) {
1452 uint64_t remap_deadlist_obj =
1453 dsl_dataset_get_remap_deadlist_object(ds);
1454 /*
1455 * Move the remap_deadlist to the snapshot. The head
1456 * will create a new remap deadlist on demand, from
1457 * dsl_dataset_block_remapped().
1458 */
1459 dsl_dataset_unset_remap_deadlist_object(ds, tx);
1460 dsl_deadlist_close(&ds->ds_remap_deadlist);
1461
1462 dmu_object_zapify(mos, dsobj, DMU_OT_DSL_DATASET, tx);
1463 VERIFY0(zap_add(mos, dsobj, DS_FIELD_REMAP_DEADLIST,
1464 sizeof (remap_deadlist_obj), 1, &remap_deadlist_obj, tx));
1465 }
1466
1467 ASSERT3U(dsl_dataset_phys(ds)->ds_prev_snap_txg, <, tx->tx_txg);
1468 dsl_dataset_phys(ds)->ds_prev_snap_obj = dsobj;
1469 dsl_dataset_phys(ds)->ds_prev_snap_txg = crtxg;
1470 dsl_dataset_phys(ds)->ds_unique_bytes = 0;
1471
1472 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE)
1473 dsl_dataset_phys(ds)->ds_flags |= DS_FLAG_UNIQUE_ACCURATE;
1474
1475 VERIFY0(zap_add(mos, dsl_dataset_phys(ds)->ds_snapnames_zapobj,
1476 snapname, 8, 1, &dsobj, tx));
1477
1478 if (ds->ds_prev)
1479 dsl_dataset_rele(ds->ds_prev, ds);
1480 VERIFY0(dsl_dataset_hold_obj(dp,
1481 dsl_dataset_phys(ds)->ds_prev_snap_obj, ds, &ds->ds_prev));
1482
1483 dsl_scan_ds_snapshotted(ds, tx);
1484
1485 dsl_dir_snap_cmtime_update(ds->ds_dir);
1486
1487 spa_history_log_internal_ds(ds->ds_prev, "snapshot", tx, "");
1488 }
1489
1490 void
1491 dsl_dataset_snapshot_sync(void *arg, dmu_tx_t *tx)
1492 {
1493 dsl_dataset_snapshot_arg_t *ddsa = arg;
1494 dsl_pool_t *dp = dmu_tx_pool(tx);
1495 nvpair_t *pair;
1496
1497 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL);
1498 pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) {
1499 dsl_dataset_t *ds;
1500 char *name, *atp;
1501 char dsname[ZFS_MAX_DATASET_NAME_LEN];
1502
1503 name = nvpair_name(pair);
1504 atp = strchr(name, '@');
1505 (void) strlcpy(dsname, name, atp - name + 1);
1506 VERIFY0(dsl_dataset_hold(dp, dsname, FTAG, &ds));
1507
1508 dsl_dataset_snapshot_sync_impl(ds, atp + 1, tx);
1509 if (ddsa->ddsa_props != NULL) {
1510 dsl_props_set_sync_impl(ds->ds_prev,
1511 ZPROP_SRC_LOCAL, ddsa->ddsa_props, tx);
1512 }
1513 dsl_dataset_rele(ds, FTAG);
1514 }
1515 }
1516
1517 /*
1518 * The snapshots must all be in the same pool.
1519 * All-or-nothing: if there are any failures, nothing will be modified.
1520 */
1521 int
1522 dsl_dataset_snapshot(nvlist_t *snaps, nvlist_t *props, nvlist_t *errors)
1523 {
1524 dsl_dataset_snapshot_arg_t ddsa;
1525 nvpair_t *pair;
1526 boolean_t needsuspend;
1527 int error;
1528 spa_t *spa;
1529 char *firstname;
1530 nvlist_t *suspended = NULL;
1531
1532 pair = nvlist_next_nvpair(snaps, NULL);
1533 if (pair == NULL)
1534 return (0);
1535 firstname = nvpair_name(pair);
1536
1537 error = spa_open(firstname, &spa, FTAG);
1538 if (error != 0)
1539 return (error);
1540 needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP);
1541 spa_close(spa, FTAG);
1542
1543 if (needsuspend) {
1544 suspended = fnvlist_alloc();
1545 for (pair = nvlist_next_nvpair(snaps, NULL); pair != NULL;
1546 pair = nvlist_next_nvpair(snaps, pair)) {
1547 char fsname[ZFS_MAX_DATASET_NAME_LEN];
1548 char *snapname = nvpair_name(pair);
1549 char *atp;
1550 void *cookie;
1551
1552 atp = strchr(snapname, '@');
1553 if (atp == NULL) {
1554 error = SET_ERROR(EINVAL);
1555 break;
1556 }
1557 (void) strlcpy(fsname, snapname, atp - snapname + 1);
1558
1559 error = zil_suspend(fsname, &cookie);
1560 if (error != 0)
1561 break;
1562 fnvlist_add_uint64(suspended, fsname,
1563 (uintptr_t)cookie);
1564 }
1565 }
1566
1567 ddsa.ddsa_snaps = snaps;
1568 ddsa.ddsa_props = props;
1569 ddsa.ddsa_errors = errors;
1570 ddsa.ddsa_cr = CRED();
1571
1572 if (error == 0) {
1573 error = dsl_sync_task(firstname, dsl_dataset_snapshot_check,
1574 dsl_dataset_snapshot_sync, &ddsa,
1575 fnvlist_num_pairs(snaps) * 3, ZFS_SPACE_CHECK_NORMAL);
1576 }
1577
1578 if (suspended != NULL) {
1579 for (pair = nvlist_next_nvpair(suspended, NULL); pair != NULL;
1580 pair = nvlist_next_nvpair(suspended, pair)) {
1581 zil_resume((void *)(uintptr_t)
1582 fnvpair_value_uint64(pair));
1583 }
1584 fnvlist_free(suspended);
1585 }
1586
1587 return (error);
1588 }
1589
1590 typedef struct dsl_dataset_snapshot_tmp_arg {
1591 const char *ddsta_fsname;
1592 const char *ddsta_snapname;
1593 minor_t ddsta_cleanup_minor;
1594 const char *ddsta_htag;
1595 } dsl_dataset_snapshot_tmp_arg_t;
1596
1597 static int
1598 dsl_dataset_snapshot_tmp_check(void *arg, dmu_tx_t *tx)
1599 {
1600 dsl_dataset_snapshot_tmp_arg_t *ddsta = arg;
1601 dsl_pool_t *dp = dmu_tx_pool(tx);
1602 dsl_dataset_t *ds;
1603 int error;
1604
1605 error = dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds);
1606 if (error != 0)
1607 return (error);
1608
1609 /* NULL cred means no limit check for tmp snapshot */
1610 error = dsl_dataset_snapshot_check_impl(ds, ddsta->ddsta_snapname,
1611 tx, B_FALSE, 0, NULL);
1612 if (error != 0) {
1613 dsl_dataset_rele(ds, FTAG);
1614 return (error);
1615 }
1616
1617 if (spa_version(dp->dp_spa) < SPA_VERSION_USERREFS) {
1618 dsl_dataset_rele(ds, FTAG);
1619 return (SET_ERROR(ENOTSUP));
1620 }
1621 error = dsl_dataset_user_hold_check_one(NULL, ddsta->ddsta_htag,
1622 B_TRUE, tx);
1623 if (error != 0) {
1624 dsl_dataset_rele(ds, FTAG);
1625 return (error);
1626 }
1627
1628 dsl_dataset_rele(ds, FTAG);
1629 return (0);
1630 }
1631
1632 static void
1633 dsl_dataset_snapshot_tmp_sync(void *arg, dmu_tx_t *tx)
1634 {
1635 dsl_dataset_snapshot_tmp_arg_t *ddsta = arg;
1636 dsl_pool_t *dp = dmu_tx_pool(tx);
1637 dsl_dataset_t *ds;
1638
1639 VERIFY0(dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds));
1640
1641 dsl_dataset_snapshot_sync_impl(ds, ddsta->ddsta_snapname, tx);
1642 dsl_dataset_user_hold_sync_one(ds->ds_prev, ddsta->ddsta_htag,
1643 ddsta->ddsta_cleanup_minor, gethrestime_sec(), tx);
1644 dsl_destroy_snapshot_sync_impl(ds->ds_prev, B_TRUE, tx);
1645
1646 dsl_dataset_rele(ds, FTAG);
1647 }
1648
1649 int
1650 dsl_dataset_snapshot_tmp(const char *fsname, const char *snapname,
1651 minor_t cleanup_minor, const char *htag)
1652 {
1653 dsl_dataset_snapshot_tmp_arg_t ddsta;
1654 int error;
1655 spa_t *spa;
1656 boolean_t needsuspend;
1657 void *cookie;
1658
1659 ddsta.ddsta_fsname = fsname;
1660 ddsta.ddsta_snapname = snapname;
1661 ddsta.ddsta_cleanup_minor = cleanup_minor;
1662 ddsta.ddsta_htag = htag;
1663
1664 error = spa_open(fsname, &spa, FTAG);
1665 if (error != 0)
1666 return (error);
1667 needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP);
1668 spa_close(spa, FTAG);
1669
1670 if (needsuspend) {
1671 error = zil_suspend(fsname, &cookie);
1672 if (error != 0)
1673 return (error);
1674 }
1675
1676 error = dsl_sync_task(fsname, dsl_dataset_snapshot_tmp_check,
1677 dsl_dataset_snapshot_tmp_sync, &ddsta, 3, ZFS_SPACE_CHECK_RESERVED);
1678
1679 if (needsuspend)
1680 zil_resume(cookie);
1681 return (error);
1682 }
1683
1684 void
1685 dsl_dataset_sync(dsl_dataset_t *ds, zio_t *zio, dmu_tx_t *tx)
1686 {
1687 ASSERT(dmu_tx_is_syncing(tx));
1688 ASSERT(ds->ds_objset != NULL);
1689 ASSERT(dsl_dataset_phys(ds)->ds_next_snap_obj == 0);
1690
1691 /*
1692 * in case we had to change ds_fsid_guid when we opened it,
1693 * sync it out now.
1694 */
1695 dmu_buf_will_dirty(ds->ds_dbuf, tx);
1696 dsl_dataset_phys(ds)->ds_fsid_guid = ds->ds_fsid_guid;
1697
1698 if (ds->ds_resume_bytes[tx->tx_txg & TXG_MASK] != 0) {
1699 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset,
1700 ds->ds_object, DS_FIELD_RESUME_OBJECT, 8, 1,
1701 &ds->ds_resume_object[tx->tx_txg & TXG_MASK], tx));
1702 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset,
1703 ds->ds_object, DS_FIELD_RESUME_OFFSET, 8, 1,
1704 &ds->ds_resume_offset[tx->tx_txg & TXG_MASK], tx));
1705 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset,
1706 ds->ds_object, DS_FIELD_RESUME_BYTES, 8, 1,
1707 &ds->ds_resume_bytes[tx->tx_txg & TXG_MASK], tx));
1708 ds->ds_resume_object[tx->tx_txg & TXG_MASK] = 0;
1709 ds->ds_resume_offset[tx->tx_txg & TXG_MASK] = 0;
1710 ds->ds_resume_bytes[tx->tx_txg & TXG_MASK] = 0;
1711 }
1712
1713 dmu_objset_sync(ds->ds_objset, zio, tx);
1714
1715 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) {
1716 if (ds->ds_feature_activation_needed[f]) {
1717 if (ds->ds_feature_inuse[f])
1718 continue;
1719 dsl_dataset_activate_feature(ds->ds_object, f, tx);
1720 ds->ds_feature_inuse[f] = B_TRUE;
1721 }
1722 }
1723 }
1724
1725 static int
1726 deadlist_enqueue_cb(void *arg, const blkptr_t *bp, dmu_tx_t *tx)
1727 {
1728 dsl_deadlist_t *dl = arg;
1729 dsl_deadlist_insert(dl, bp, tx);
1730 return (0);
1731 }
1732
1733 void
1734 dsl_dataset_sync_done(dsl_dataset_t *ds, dmu_tx_t *tx)
1735 {
1736 objset_t *os = ds->ds_objset;
1737
1738 bplist_iterate(&ds->ds_pending_deadlist,
1739 deadlist_enqueue_cb, &ds->ds_deadlist, tx);
1740
1741 if (os->os_synced_dnodes != NULL) {
1742 multilist_destroy(os->os_synced_dnodes);
1743 os->os_synced_dnodes = NULL;
1744 }
1745
1746 ASSERT(!dmu_objset_is_dirty(os, dmu_tx_get_txg(tx)));
1747
1748 dmu_buf_rele(ds->ds_dbuf, ds);
1749 }
1750
1751 int
1752 get_clones_stat_impl(dsl_dataset_t *ds, nvlist_t *val)
1753 {
1754 uint64_t count = 0;
1755 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
1756 zap_cursor_t zc;
1757 zap_attribute_t za;
1758
1759 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool));
1760
1761 /*
1762 * There may be missing entries in ds_next_clones_obj
1763 * due to a bug in a previous version of the code.
1764 * Only trust it if it has the right number of entries.
1765 */
1766 if (dsl_dataset_phys(ds)->ds_next_clones_obj != 0) {
1767 VERIFY0(zap_count(mos, dsl_dataset_phys(ds)->ds_next_clones_obj,
1768 &count));
1769 }
1770 if (count != dsl_dataset_phys(ds)->ds_num_children - 1) {
1771 return (ENOENT);
1772 }
1773 for (zap_cursor_init(&zc, mos,
1774 dsl_dataset_phys(ds)->ds_next_clones_obj);
1775 zap_cursor_retrieve(&zc, &za) == 0;
1776 zap_cursor_advance(&zc)) {
1777 dsl_dataset_t *clone;
1778 char buf[ZFS_MAX_DATASET_NAME_LEN];
1779 VERIFY0(dsl_dataset_hold_obj(ds->ds_dir->dd_pool,
1780 za.za_first_integer, FTAG, &clone));
1781 dsl_dir_name(clone->ds_dir, buf);
1782 fnvlist_add_boolean(val, buf);
1783 dsl_dataset_rele(clone, FTAG);
1784 }
1785 zap_cursor_fini(&zc);
1786 return (0);
1787 }
1788
1789 void
1790 get_clones_stat(dsl_dataset_t *ds, nvlist_t *nv)
1791 {
1792 nvlist_t *propval = fnvlist_alloc();
1793 nvlist_t *val;
1794
1795 /*
1796 * We use nvlist_alloc() instead of fnvlist_alloc() because the
1797 * latter would allocate the list with NV_UNIQUE_NAME flag.
1798 * As a result, every time a clone name is appended to the list
1799 * it would be (linearly) searched for for a duplicate name.
1800 * We already know that all clone names must be unique and we
1801 * want avoid the quadratic complexity of double-checking that
1802 * because we can have a large number of clones.
1803 */
1804 VERIFY0(nvlist_alloc(&val, 0, KM_SLEEP));
1805
1806 if (get_clones_stat_impl(ds, val) == 0) {
1807 fnvlist_add_nvlist(propval, ZPROP_VALUE, val);
1808 fnvlist_add_nvlist(nv, zfs_prop_to_name(ZFS_PROP_CLONES),
1809 propval);
1810 }
1811
1812 nvlist_free(val);
1813 nvlist_free(propval);
1814 }
1815
1816 /*
1817 * Returns a string that represents the receive resume stats token. It should
1818 * be freed with strfree().
1819 */
1820 char *
1821 get_receive_resume_stats_impl(dsl_dataset_t *ds)
1822 {
1823 dsl_pool_t *dp = ds->ds_dir->dd_pool;
1824
1825 if (dsl_dataset_has_resume_receive_state(ds)) {
1826 char *str;
1827 void *packed;
1828 uint8_t *compressed;
1829 uint64_t val;
1830 nvlist_t *token_nv = fnvlist_alloc();
1831 size_t packed_size, compressed_size;
1832
1833 if (zap_lookup(dp->dp_meta_objset, ds->ds_object,
1834 DS_FIELD_RESUME_FROMGUID, sizeof (val), 1, &val) == 0) {
1835 fnvlist_add_uint64(token_nv, "fromguid", val);
1836 }
1837 if (zap_lookup(dp->dp_meta_objset, ds->ds_object,
1838 DS_FIELD_RESUME_OBJECT, sizeof (val), 1, &val) == 0) {
1839 fnvlist_add_uint64(token_nv, "object", val);
1840 }
1841 if (zap_lookup(dp->dp_meta_objset, ds->ds_object,
1842 DS_FIELD_RESUME_OFFSET, sizeof (val), 1, &val) == 0) {
1843 fnvlist_add_uint64(token_nv, "offset", val);
1844 }
1845 if (zap_lookup(dp->dp_meta_objset, ds->ds_object,
1846 DS_FIELD_RESUME_BYTES, sizeof (val), 1, &val) == 0) {
1847 fnvlist_add_uint64(token_nv, "bytes", val);
1848 }
1849 if (zap_lookup(dp->dp_meta_objset, ds->ds_object,
1850 DS_FIELD_RESUME_TOGUID, sizeof (val), 1, &val) == 0) {
1851 fnvlist_add_uint64(token_nv, "toguid", val);
1852 }
1853 char buf[256];
1854 if (zap_lookup(dp->dp_meta_objset, ds->ds_object,
1855 DS_FIELD_RESUME_TONAME, 1, sizeof (buf), buf) == 0) {
1856 fnvlist_add_string(token_nv, "toname", buf);
1857 }
1858 if (zap_contains(dp->dp_meta_objset, ds->ds_object,
1859 DS_FIELD_RESUME_LARGEBLOCK) == 0) {
1860 fnvlist_add_boolean(token_nv, "largeblockok");
1861 }
1862 if (zap_contains(dp->dp_meta_objset, ds->ds_object,
1863 DS_FIELD_RESUME_EMBEDOK) == 0) {
1864 fnvlist_add_boolean(token_nv, "embedok");
1865 }
1866 if (zap_contains(dp->dp_meta_objset, ds->ds_object,
1867 DS_FIELD_RESUME_COMPRESSOK) == 0) {
1868 fnvlist_add_boolean(token_nv, "compressok");
1869 }
1870 packed = fnvlist_pack(token_nv, &packed_size);
1871 fnvlist_free(token_nv);
1872 compressed = kmem_alloc(packed_size, KM_SLEEP);
1873
1874 compressed_size = gzip_compress(packed, compressed,
1875 packed_size, packed_size, 6);
1876
1877 zio_cksum_t cksum;
1878 fletcher_4_native(compressed, compressed_size, NULL, &cksum);
1879
1880 str = kmem_alloc(compressed_size * 2 + 1, KM_SLEEP);
1881 for (int i = 0; i < compressed_size; i++) {
1882 (void) sprintf(str + i * 2, "%02x", compressed[i]);
1883 }
1884 str[compressed_size * 2] = '\0';
1885 char *propval = kmem_asprintf("%u-%llx-%llx-%s",
1886 ZFS_SEND_RESUME_TOKEN_VERSION,
1887 (longlong_t)cksum.zc_word[0],
1888 (longlong_t)packed_size, str);
1889 kmem_free(packed, packed_size);
1890 kmem_free(str, compressed_size * 2 + 1);
1891 kmem_free(compressed, packed_size);
1892 return (propval);
1893 }
1894 return (strdup(""));
1895 }
1896
1897 /*
1898 * Returns a string that represents the receive resume stats token of the
1899 * dataset's child. It should be freed with strfree().
1900 */
1901 char *
1902 get_child_receive_stats(dsl_dataset_t *ds)
1903 {
1904 char recvname[ZFS_MAX_DATASET_NAME_LEN + 6];
1905 dsl_dataset_t *recv_ds;
1906 dsl_dataset_name(ds, recvname);
1907 if (strlcat(recvname, "/", sizeof (recvname)) <
1908 sizeof (recvname) &&
1909 strlcat(recvname, recv_clone_name, sizeof (recvname)) <
1910 sizeof (recvname) &&
1911 dsl_dataset_hold(ds->ds_dir->dd_pool, recvname, FTAG,
1912 &recv_ds) == 0) {
1913 char *propval = get_receive_resume_stats_impl(recv_ds);
1914 dsl_dataset_rele(recv_ds, FTAG);
1915 return (propval);
1916 }
1917 return (strdup(""));
1918 }
1919
1920 static void
1921 get_receive_resume_stats(dsl_dataset_t *ds, nvlist_t *nv)
1922 {
1923 char *propval = get_receive_resume_stats_impl(ds);
1924 if (strcmp(propval, "") != 0) {
1925 dsl_prop_nvlist_add_string(nv,
1926 ZFS_PROP_RECEIVE_RESUME_TOKEN, propval);
1927 } else {
1928 char *childval = get_child_receive_stats(ds);
1929 if (strcmp(childval, "") != 0) {
1930 dsl_prop_nvlist_add_string(nv,
1931 ZFS_PROP_RECEIVE_RESUME_TOKEN, childval);
1932 }
1933 strfree(childval);
1934 }
1935 strfree(propval);
1936 }
1937
1938 uint64_t
1939 dsl_get_refratio(dsl_dataset_t *ds)
1940 {
1941 uint64_t ratio = dsl_dataset_phys(ds)->ds_compressed_bytes == 0 ? 100 :
1942 (dsl_dataset_phys(ds)->ds_uncompressed_bytes * 100 /
1943 dsl_dataset_phys(ds)->ds_compressed_bytes);
1944 return (ratio);
1945 }
1946
1947 uint64_t
1948 dsl_get_logicalreferenced(dsl_dataset_t *ds)
1949 {
1950 return (dsl_dataset_phys(ds)->ds_uncompressed_bytes);
1951 }
1952
1953 uint64_t
1954 dsl_get_compressratio(dsl_dataset_t *ds)
1955 {
1956 if (ds->ds_is_snapshot) {
1957 return (dsl_get_refratio(ds));
1958 } else {
1959 dsl_dir_t *dd = ds->ds_dir;
1960 mutex_enter(&dd->dd_lock);
1961 uint64_t val = dsl_dir_get_compressratio(dd);
1962 mutex_exit(&dd->dd_lock);
1963 return (val);
1964 }
1965 }
1966
1967 uint64_t
1968 dsl_get_used(dsl_dataset_t *ds)
1969 {
1970 if (ds->ds_is_snapshot) {
1971 return (dsl_dataset_phys(ds)->ds_unique_bytes);
1972 } else {
1973 dsl_dir_t *dd = ds->ds_dir;
1974 mutex_enter(&dd->dd_lock);
1975 uint64_t val = dsl_dir_get_used(dd);
1976 mutex_exit(&dd->dd_lock);
1977 return (val);
1978 }
1979 }
1980
1981 uint64_t
1982 dsl_get_creation(dsl_dataset_t *ds)
1983 {
1984 return (dsl_dataset_phys(ds)->ds_creation_time);
1985 }
1986
1987 uint64_t
1988 dsl_get_creationtxg(dsl_dataset_t *ds)
1989 {
1990 return (dsl_dataset_phys(ds)->ds_creation_txg);
1991 }
1992
1993 uint64_t
1994 dsl_get_refquota(dsl_dataset_t *ds)
1995 {
1996 return (ds->ds_quota);
1997 }
1998
1999 uint64_t
2000 dsl_get_refreservation(dsl_dataset_t *ds)
2001 {
2002 return (ds->ds_reserved);
2003 }
2004
2005 uint64_t
2006 dsl_get_guid(dsl_dataset_t *ds)
2007 {
2008 return (dsl_dataset_phys(ds)->ds_guid);
2009 }
2010
2011 uint64_t
2012 dsl_get_unique(dsl_dataset_t *ds)
2013 {
2014 return (dsl_dataset_phys(ds)->ds_unique_bytes);
2015 }
2016
2017 uint64_t
2018 dsl_get_objsetid(dsl_dataset_t *ds)
2019 {
2020 return (ds->ds_object);
2021 }
2022
2023 uint64_t
2024 dsl_get_userrefs(dsl_dataset_t *ds)
2025 {
2026 return (ds->ds_userrefs);
2027 }
2028
2029 uint64_t
2030 dsl_get_defer_destroy(dsl_dataset_t *ds)
2031 {
2032 return (DS_IS_DEFER_DESTROY(ds) ? 1 : 0);
2033 }
2034
2035 uint64_t
2036 dsl_get_referenced(dsl_dataset_t *ds)
2037 {
2038 return (dsl_dataset_phys(ds)->ds_referenced_bytes);
2039 }
2040
2041 uint64_t
2042 dsl_get_numclones(dsl_dataset_t *ds)
2043 {
2044 ASSERT(ds->ds_is_snapshot);
2045 return (dsl_dataset_phys(ds)->ds_num_children - 1);
2046 }
2047
2048 uint64_t
2049 dsl_get_inconsistent(dsl_dataset_t *ds)
2050 {
2051 return ((dsl_dataset_phys(ds)->ds_flags & DS_FLAG_INCONSISTENT) ?
2052 1 : 0);
2053 }
2054
2055 uint64_t
2056 dsl_get_available(dsl_dataset_t *ds)
2057 {
2058 uint64_t refdbytes = dsl_get_referenced(ds);
2059 uint64_t availbytes = dsl_dir_space_available(ds->ds_dir,
2060 NULL, 0, TRUE);
2061 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes) {
2062 availbytes +=
2063 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes;
2064 }
2065 if (ds->ds_quota != 0) {
2066 /*
2067 * Adjust available bytes according to refquota
2068 */
2069 if (refdbytes < ds->ds_quota) {
2070 availbytes = MIN(availbytes,
2071 ds->ds_quota - refdbytes);
2072 } else {
2073 availbytes = 0;
2074 }
2075 }
2076 return (availbytes);
2077 }
2078
2079 int
2080 dsl_get_written(dsl_dataset_t *ds, uint64_t *written)
2081 {
2082 dsl_pool_t *dp = ds->ds_dir->dd_pool;
2083 dsl_dataset_t *prev;
2084 int err = dsl_dataset_hold_obj(dp,
2085 dsl_dataset_phys(ds)->ds_prev_snap_obj, FTAG, &prev);
2086 if (err == 0) {
2087 uint64_t comp, uncomp;
2088 err = dsl_dataset_space_written(prev, ds, written,
2089 &comp, &uncomp);
2090 dsl_dataset_rele(prev, FTAG);
2091 }
2092 return (err);
2093 }
2094
2095 /*
2096 * 'snap' should be a buffer of size ZFS_MAX_DATASET_NAME_LEN.
2097 */
2098 int
2099 dsl_get_prev_snap(dsl_dataset_t *ds, char *snap)
2100 {
2101 dsl_pool_t *dp = ds->ds_dir->dd_pool;
2102 if (ds->ds_prev != NULL && ds->ds_prev != dp->dp_origin_snap) {
2103 dsl_dataset_name(ds->ds_prev, snap);
2104 return (0);
2105 } else {
2106 return (ENOENT);
2107 }
2108 }
2109
2110 /*
2111 * Returns the mountpoint property and source for the given dataset in the value
2112 * and source buffers. The value buffer must be at least as large as MAXPATHLEN
2113 * and the source buffer as least as large a ZFS_MAX_DATASET_NAME_LEN.
2114 * Returns 0 on success and an error on failure.
2115 */
2116 int
2117 dsl_get_mountpoint(dsl_dataset_t *ds, const char *dsname, char *value,
2118 char *source)
2119 {
2120 int error;
2121 dsl_pool_t *dp = ds->ds_dir->dd_pool;
2122
2123 /* Retrieve the mountpoint value stored in the zap opbject */
2124 error = dsl_prop_get_ds(ds, zfs_prop_to_name(ZFS_PROP_MOUNTPOINT), 1,
2125 ZAP_MAXVALUELEN, value, source);
2126 if (error != 0) {
2127 return (error);
2128 }
2129
2130 /* Process the dsname and source to find the full mountpoint string */
2131 if (value[0] == '/') {
2132 char *buf = kmem_alloc(ZAP_MAXVALUELEN, KM_SLEEP);
2133 char *root = buf;
2134 const char *relpath;
2135
2136 /*
2137 * If we inherit the mountpoint, even from a dataset
2138 * with a received value, the source will be the path of
2139 * the dataset we inherit from. If source is
2140 * ZPROP_SOURCE_VAL_RECVD, the received value is not
2141 * inherited.
2142 */
2143 if (strcmp(source, ZPROP_SOURCE_VAL_RECVD) == 0) {
2144 relpath = "";
2145 } else {
2146 ASSERT0(strncmp(dsname, source, strlen(source)));
2147 relpath = dsname + strlen(source);
2148 if (relpath[0] == '/')
2149 relpath++;
2150 }
2151
2152 spa_altroot(dp->dp_spa, root, ZAP_MAXVALUELEN);
2153
2154 /*
2155 * Special case an alternate root of '/'. This will
2156 * avoid having multiple leading slashes in the
2157 * mountpoint path.
2158 */
2159 if (strcmp(root, "/") == 0)
2160 root++;
2161
2162 /*
2163 * If the mountpoint is '/' then skip over this
2164 * if we are obtaining either an alternate root or
2165 * an inherited mountpoint.
2166 */
2167 char *mnt = value;
2168 if (value[1] == '\0' && (root[0] != '\0' ||
2169 relpath[0] != '\0'))
2170 mnt = value + 1;
2171
2172 if (relpath[0] == '\0') {
2173 (void) snprintf(value, ZAP_MAXVALUELEN, "%s%s",
2174 root, mnt);
2175 } else {
2176 (void) snprintf(value, ZAP_MAXVALUELEN, "%s%s%s%s",
2177 root, mnt, relpath[0] == '@' ? "" : "/",
2178 relpath);
2179 }
2180 kmem_free(buf, ZAP_MAXVALUELEN);
2181 } else {
2182 /* 'legacy' or 'none' */
2183 (void) snprintf(value, ZAP_MAXVALUELEN, "%s", value);
2184 }
2185 return (0);
2186 }
2187
2188 void
2189 dsl_dataset_stats(dsl_dataset_t *ds, nvlist_t *nv)
2190 {
2191 dsl_pool_t *dp = ds->ds_dir->dd_pool;
2192
2193 ASSERT(dsl_pool_config_held(dp));
2194
2195 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRATIO,
2196 dsl_get_refratio(ds));
2197 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_LOGICALREFERENCED,
2198 dsl_get_logicalreferenced(ds));
2199 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_COMPRESSRATIO,
2200 dsl_get_compressratio(ds));
2201 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USED,
2202 dsl_get_used(ds));
2203
2204 if (ds->ds_is_snapshot) {
2205 get_clones_stat(ds, nv);
2206 } else {
2207 char buf[ZFS_MAX_DATASET_NAME_LEN];
2208 if (dsl_get_prev_snap(ds, buf) == 0)
2209 dsl_prop_nvlist_add_string(nv, ZFS_PROP_PREV_SNAP,
2210 buf);
2211 dsl_dir_stats(ds->ds_dir, nv);
2212 }
2213
2214 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_AVAILABLE,
2215 dsl_get_available(ds));
2216 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFERENCED,
2217 dsl_get_referenced(ds));
2218 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATION,
2219 dsl_get_creation(ds));
2220 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATETXG,
2221 dsl_get_creationtxg(ds));
2222 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFQUOTA,
2223 dsl_get_refquota(ds));
2224 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRESERVATION,
2225 dsl_get_refreservation(ds));
2226 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_GUID,
2227 dsl_get_guid(ds));
2228 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_UNIQUE,
2229 dsl_get_unique(ds));
2230 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_OBJSETID,
2231 dsl_get_objsetid(ds));
2232 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USERREFS,
2233 dsl_get_userrefs(ds));
2234 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_DEFER_DESTROY,
2235 dsl_get_defer_destroy(ds));
2236
2237 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) {
2238 uint64_t written;
2239 if (dsl_get_written(ds, &written) == 0) {
2240 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_WRITTEN,
2241 written);
2242 }
2243 }
2244
2245 if (!dsl_dataset_is_snapshot(ds)) {
2246 /*
2247 * A failed "newfs" (e.g. full) resumable receive leaves
2248 * the stats set on this dataset. Check here for the prop.
2249 */
2250 get_receive_resume_stats(ds, nv);
2251
2252 /*
2253 * A failed incremental resumable receive leaves the
2254 * stats set on our child named "%recv". Check the child
2255 * for the prop.
2256 */
2257 /* 6 extra bytes for /%recv */
2258 char recvname[ZFS_MAX_DATASET_NAME_LEN + 6];
2259 dsl_dataset_t *recv_ds;
2260 dsl_dataset_name(ds, recvname);
2261 if (strlcat(recvname, "/", sizeof (recvname)) <
2262 sizeof (recvname) &&
2263 strlcat(recvname, recv_clone_name, sizeof (recvname)) <
2264 sizeof (recvname) &&
2265 dsl_dataset_hold(dp, recvname, FTAG, &recv_ds) == 0) {
2266 get_receive_resume_stats(recv_ds, nv);
2267 dsl_dataset_rele(recv_ds, FTAG);
2268 }
2269 }
2270 }
2271
2272 void
2273 dsl_dataset_fast_stat(dsl_dataset_t *ds, dmu_objset_stats_t *stat)
2274 {
2275 dsl_pool_t *dp = ds->ds_dir->dd_pool;
2276 ASSERT(dsl_pool_config_held(dp));
2277
2278 stat->dds_creation_txg = dsl_get_creationtxg(ds);
2279 stat->dds_inconsistent = dsl_get_inconsistent(ds);
2280 stat->dds_guid = dsl_get_guid(ds);
2281 stat->dds_origin[0] = '\0';
2282 if (ds->ds_is_snapshot) {
2283 stat->dds_is_snapshot = B_TRUE;
2284 stat->dds_num_clones = dsl_get_numclones(ds);
2285 } else {
2286 stat->dds_is_snapshot = B_FALSE;
2287 stat->dds_num_clones = 0;
2288
2289 if (dsl_dir_is_clone(ds->ds_dir)) {
2290 dsl_dir_get_origin(ds->ds_dir, stat->dds_origin);
2291 }
2292 }
2293 }
2294
2295 uint64_t
2296 dsl_dataset_fsid_guid(dsl_dataset_t *ds)
2297 {
2298 return (ds->ds_fsid_guid);
2299 }
2300
2301 void
2302 dsl_dataset_space(dsl_dataset_t *ds,
2303 uint64_t *refdbytesp, uint64_t *availbytesp,
2304 uint64_t *usedobjsp, uint64_t *availobjsp)
2305 {
2306 *refdbytesp = dsl_dataset_phys(ds)->ds_referenced_bytes;
2307 *availbytesp = dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE);
2308 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes)
2309 *availbytesp +=
2310 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes;
2311 if (ds->ds_quota != 0) {
2312 /*
2313 * Adjust available bytes according to refquota
2314 */
2315 if (*refdbytesp < ds->ds_quota)
2316 *availbytesp = MIN(*availbytesp,
2317 ds->ds_quota - *refdbytesp);
2318 else
2319 *availbytesp = 0;
2320 }
2321 rrw_enter(&ds->ds_bp_rwlock, RW_READER, FTAG);
2322 *usedobjsp = BP_GET_FILL(&dsl_dataset_phys(ds)->ds_bp);
2323 rrw_exit(&ds->ds_bp_rwlock, FTAG);
2324 *availobjsp = DN_MAX_OBJECT - *usedobjsp;
2325 }
2326
2327 boolean_t
2328 dsl_dataset_modified_since_snap(dsl_dataset_t *ds, dsl_dataset_t *snap)
2329 {
2330 dsl_pool_t *dp = ds->ds_dir->dd_pool;
2331 uint64_t birth;
2332
2333 ASSERT(dsl_pool_config_held(dp));
2334 if (snap == NULL)
2335 return (B_FALSE);
2336 rrw_enter(&ds->ds_bp_rwlock, RW_READER, FTAG);
2337 birth = dsl_dataset_get_blkptr(ds)->blk_birth;
2338 rrw_exit(&ds->ds_bp_rwlock, FTAG);
2339 if (birth > dsl_dataset_phys(snap)->ds_creation_txg) {
2340 objset_t *os, *os_snap;
2341 /*
2342 * It may be that only the ZIL differs, because it was
2343 * reset in the head. Don't count that as being
2344 * modified.
2345 */
2346 if (dmu_objset_from_ds(ds, &os) != 0)
2347 return (B_TRUE);
2348 if (dmu_objset_from_ds(snap, &os_snap) != 0)
2349 return (B_TRUE);
2350 return (bcmp(&os->os_phys->os_meta_dnode,
2351 &os_snap->os_phys->os_meta_dnode,
2352 sizeof (os->os_phys->os_meta_dnode)) != 0);
2353 }
2354 return (B_FALSE);
2355 }
2356
2357 typedef struct dsl_dataset_rename_snapshot_arg {
2358 const char *ddrsa_fsname;
2359 const char *ddrsa_oldsnapname;
2360 const char *ddrsa_newsnapname;
2361 boolean_t ddrsa_recursive;
2362 dmu_tx_t *ddrsa_tx;
2363 } dsl_dataset_rename_snapshot_arg_t;
2364
2365 /* ARGSUSED */
2366 static int
2367 dsl_dataset_rename_snapshot_check_impl(dsl_pool_t *dp,
2368 dsl_dataset_t *hds, void *arg)
2369 {
2370 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg;
2371 int error;
2372 uint64_t val;
2373
2374 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val);
2375 if (error != 0) {
2376 /* ignore nonexistent snapshots */
2377 return (error == ENOENT ? 0 : error);
2378 }
2379
2380 /* new name should not exist */
2381 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_newsnapname, &val);
2382 if (error == 0)
2383 error = SET_ERROR(EEXIST);
2384 else if (error == ENOENT)
2385 error = 0;
2386
2387 /* dataset name + 1 for the "@" + the new snapshot name must fit */
2388 if (dsl_dir_namelen(hds->ds_dir) + 1 +
2389 strlen(ddrsa->ddrsa_newsnapname) >= ZFS_MAX_DATASET_NAME_LEN)
2390 error = SET_ERROR(ENAMETOOLONG);
2391
2392 return (error);
2393 }
2394
2395 static int
2396 dsl_dataset_rename_snapshot_check(void *arg, dmu_tx_t *tx)
2397 {
2398 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg;
2399 dsl_pool_t *dp = dmu_tx_pool(tx);
2400 dsl_dataset_t *hds;
2401 int error;
2402
2403 error = dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds);
2404 if (error != 0)
2405 return (error);
2406
2407 if (ddrsa->ddrsa_recursive) {
2408 error = dmu_objset_find_dp(dp, hds->ds_dir->dd_object,
2409 dsl_dataset_rename_snapshot_check_impl, ddrsa,
2410 DS_FIND_CHILDREN);
2411 } else {
2412 error = dsl_dataset_rename_snapshot_check_impl(dp, hds, ddrsa);
2413 }
2414 dsl_dataset_rele(hds, FTAG);
2415 return (error);
2416 }
2417
2418 static int
2419 dsl_dataset_rename_snapshot_sync_impl(dsl_pool_t *dp,
2420 dsl_dataset_t *hds, void *arg)
2421 {
2422 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg;
2423 dsl_dataset_t *ds;
2424 uint64_t val;
2425 dmu_tx_t *tx = ddrsa->ddrsa_tx;
2426 int error;
2427
2428 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val);
2429 ASSERT(error == 0 || error == ENOENT);
2430 if (error == ENOENT) {
2431 /* ignore nonexistent snapshots */
2432 return (0);
2433 }
2434
2435 VERIFY0(dsl_dataset_hold_obj(dp, val, FTAG, &ds));
2436
2437 /* log before we change the name */
2438 spa_history_log_internal_ds(ds, "rename", tx,
2439 "-> @%s", ddrsa->ddrsa_newsnapname);
2440
2441 VERIFY0(dsl_dataset_snap_remove(hds, ddrsa->ddrsa_oldsnapname, tx,
2442 B_FALSE));
2443 mutex_enter(&ds->ds_lock);
2444 (void) strcpy(ds->ds_snapname, ddrsa->ddrsa_newsnapname);
2445 mutex_exit(&ds->ds_lock);
2446 VERIFY0(zap_add(dp->dp_meta_objset,
2447 dsl_dataset_phys(hds)->ds_snapnames_zapobj,
2448 ds->ds_snapname, 8, 1, &ds->ds_object, tx));
2449
2450 dsl_dataset_rele(ds, FTAG);
2451 return (0);
2452 }
2453
2454 static void
2455 dsl_dataset_rename_snapshot_sync(void *arg, dmu_tx_t *tx)
2456 {
2457 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg;
2458 dsl_pool_t *dp = dmu_tx_pool(tx);
2459 dsl_dataset_t *hds;
2460
2461 VERIFY0(dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds));
2462 ddrsa->ddrsa_tx = tx;
2463 if (ddrsa->ddrsa_recursive) {
2464 VERIFY0(dmu_objset_find_dp(dp, hds->ds_dir->dd_object,
2465 dsl_dataset_rename_snapshot_sync_impl, ddrsa,
2466 DS_FIND_CHILDREN));
2467 } else {
2468 VERIFY0(dsl_dataset_rename_snapshot_sync_impl(dp, hds, ddrsa));
2469 }
2470 dsl_dataset_rele(hds, FTAG);
2471 }
2472
2473 int
2474 dsl_dataset_rename_snapshot(const char *fsname,
2475 const char *oldsnapname, const char *newsnapname, boolean_t recursive)
2476 {
2477 dsl_dataset_rename_snapshot_arg_t ddrsa;
2478
2479 ddrsa.ddrsa_fsname = fsname;
2480 ddrsa.ddrsa_oldsnapname = oldsnapname;
2481 ddrsa.ddrsa_newsnapname = newsnapname;
2482 ddrsa.ddrsa_recursive = recursive;
2483
2484 return (dsl_sync_task(fsname, dsl_dataset_rename_snapshot_check,
2485 dsl_dataset_rename_snapshot_sync, &ddrsa,
2486 1, ZFS_SPACE_CHECK_RESERVED));
2487 }
2488
2489 /*
2490 * If we're doing an ownership handoff, we need to make sure that there is
2491 * only one long hold on the dataset. We're not allowed to change anything here
2492 * so we don't permanently release the long hold or regular hold here. We want
2493 * to do this only when syncing to avoid the dataset unexpectedly going away
2494 * when we release the long hold.
2495 */
2496 static int
2497 dsl_dataset_handoff_check(dsl_dataset_t *ds, void *owner, dmu_tx_t *tx)
2498 {
2499 boolean_t held;
2500
2501 if (!dmu_tx_is_syncing(tx))
2502 return (0);
2503
2504 if (owner != NULL) {
2505 VERIFY3P(ds->ds_owner, ==, owner);
2506 dsl_dataset_long_rele(ds, owner);
2507 }
2508
2509 held = dsl_dataset_long_held(ds);
2510
2511 if (owner != NULL)
2512 dsl_dataset_long_hold(ds, owner);
2513
2514 if (held)
2515 return (SET_ERROR(EBUSY));
2516
2517 return (0);
2518 }
2519
2520 int
2521 dsl_dataset_rollback_check(void *arg, dmu_tx_t *tx)
2522 {
2523 dsl_dataset_rollback_arg_t *ddra = arg;
2524 dsl_pool_t *dp = dmu_tx_pool(tx);
2525 dsl_dataset_t *ds;
2526 int64_t unused_refres_delta;
2527 int error;
2528
2529 error = dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds);
2530 if (error != 0)
2531 return (error);
2532
2533 /* must not be a snapshot */
2534 if (ds->ds_is_snapshot) {
2535 dsl_dataset_rele(ds, FTAG);
2536 return (SET_ERROR(EINVAL));
2537 }
2538
2539 /* must have a most recent snapshot */
2540 if (dsl_dataset_phys(ds)->ds_prev_snap_txg < TXG_INITIAL) {
2541 dsl_dataset_rele(ds, FTAG);
2542 return (SET_ERROR(ESRCH));
2543 }
2544
2545 /*
2546 * No rollback to a snapshot created in the current txg, because
2547 * the rollback may dirty the dataset and create blocks that are
2548 * not reachable from the rootbp while having a birth txg that
2549 * falls into the snapshot's range.
2550 */
2551 if (dmu_tx_is_syncing(tx) &&
2552 dsl_dataset_phys(ds)->ds_prev_snap_txg >= tx->tx_txg) {
2553 dsl_dataset_rele(ds, FTAG);
2554 return (SET_ERROR(EAGAIN));
2555 }
2556
2557 /*
2558 * If the expected target snapshot is specified, then check that
2559 * the latest snapshot is it.
2560 */
2561 if (ddra->ddra_tosnap != NULL) {
2562 dsl_dataset_t *snapds;
2563
2564 /* Check if the target snapshot exists at all. */
2565 error = dsl_dataset_hold(dp, ddra->ddra_tosnap, FTAG, &snapds);
2566 if (error != 0) {
2567 /*
2568 * ESRCH is used to signal that the target snapshot does
2569 * not exist, while ENOENT is used to report that
2570 * the rolled back dataset does not exist.
2571 * ESRCH is also used to cover other cases where the
2572 * target snapshot is not related to the dataset being
2573 * rolled back such as being in a different pool.
2574 */
2575 if (error == ENOENT || error == EXDEV)
2576 error = SET_ERROR(ESRCH);
2577 dsl_dataset_rele(ds, FTAG);
2578 return (error);
2579 }
2580 ASSERT(snapds->ds_is_snapshot);
2581
2582 /* Check if the snapshot is the latest snapshot indeed. */
2583 if (snapds != ds->ds_prev) {
2584 /*
2585 * Distinguish between the case where the only problem
2586 * is intervening snapshots (EEXIST) vs the snapshot
2587 * not being a valid target for rollback (ESRCH).
2588 */
2589 if (snapds->ds_dir == ds->ds_dir ||
2590 (dsl_dir_is_clone(ds->ds_dir) &&
2591 dsl_dir_phys(ds->ds_dir)->dd_origin_obj ==
2592 snapds->ds_object)) {
2593 error = SET_ERROR(EEXIST);
2594 } else {
2595 error = SET_ERROR(ESRCH);
2596 }
2597 dsl_dataset_rele(snapds, FTAG);
2598 dsl_dataset_rele(ds, FTAG);
2599 return (error);
2600 }
2601 dsl_dataset_rele(snapds, FTAG);
2602 }
2603
2604 /* must not have any bookmarks after the most recent snapshot */
2605 nvlist_t *proprequest = fnvlist_alloc();
2606 fnvlist_add_boolean(proprequest, zfs_prop_to_name(ZFS_PROP_CREATETXG));
2607 nvlist_t *bookmarks = fnvlist_alloc();
2608 error = dsl_get_bookmarks_impl(ds, proprequest, bookmarks);
2609 fnvlist_free(proprequest);
2610 if (error != 0) {
2611 dsl_dataset_rele(ds, FTAG);
2612 return (error);
2613 }
2614 for (nvpair_t *pair = nvlist_next_nvpair(bookmarks, NULL);
2615 pair != NULL; pair = nvlist_next_nvpair(bookmarks, pair)) {
2616 nvlist_t *valuenv =
2617 fnvlist_lookup_nvlist(fnvpair_value_nvlist(pair),
2618 zfs_prop_to_name(ZFS_PROP_CREATETXG));
2619 uint64_t createtxg = fnvlist_lookup_uint64(valuenv, "value");
2620 if (createtxg > dsl_dataset_phys(ds)->ds_prev_snap_txg) {
2621 fnvlist_free(bookmarks);
2622 dsl_dataset_rele(ds, FTAG);
2623 return (SET_ERROR(EEXIST));
2624 }
2625 }
2626 fnvlist_free(bookmarks);
2627
2628 error = dsl_dataset_handoff_check(ds, ddra->ddra_owner, tx);
2629 if (error != 0) {
2630 dsl_dataset_rele(ds, FTAG);
2631 return (error);
2632 }
2633
2634 /*
2635 * Check if the snap we are rolling back to uses more than
2636 * the refquota.
2637 */
2638 if (ds->ds_quota != 0 &&
2639 dsl_dataset_phys(ds->ds_prev)->ds_referenced_bytes > ds->ds_quota) {
2640 dsl_dataset_rele(ds, FTAG);
2641 return (SET_ERROR(EDQUOT));
2642 }
2643
2644 /*
2645 * When we do the clone swap, we will temporarily use more space
2646 * due to the refreservation (the head will no longer have any
2647 * unique space, so the entire amount of the refreservation will need
2648 * to be free). We will immediately destroy the clone, freeing
2649 * this space, but the freeing happens over many txg's.
2650 */
2651 unused_refres_delta = (int64_t)MIN(ds->ds_reserved,
2652 dsl_dataset_phys(ds)->ds_unique_bytes);
2653
2654 if (unused_refres_delta > 0 &&
2655 unused_refres_delta >
2656 dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE)) {
2657 dsl_dataset_rele(ds, FTAG);
2658 return (SET_ERROR(ENOSPC));
2659 }
2660
2661 dsl_dataset_rele(ds, FTAG);
2662 return (0);
2663 }
2664
2665 void
2666 dsl_dataset_rollback_sync(void *arg, dmu_tx_t *tx)
2667 {
2668 dsl_dataset_rollback_arg_t *ddra = arg;
2669 dsl_pool_t *dp = dmu_tx_pool(tx);
2670 dsl_dataset_t *ds, *clone;
2671 uint64_t cloneobj;
2672 char namebuf[ZFS_MAX_DATASET_NAME_LEN];
2673
2674 VERIFY0(dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds));
2675
2676 dsl_dataset_name(ds->ds_prev, namebuf);
2677 fnvlist_add_string(ddra->ddra_result, "target", namebuf);
2678
2679 cloneobj = dsl_dataset_create_sync(ds->ds_dir, "%rollback",
2680 ds->ds_prev, DS_CREATE_FLAG_NODIRTY, kcred, tx);
2681
2682 VERIFY0(dsl_dataset_hold_obj(dp, cloneobj, FTAG, &clone));
2683
2684 dsl_dataset_clone_swap_sync_impl(clone, ds, tx);
2685 dsl_dataset_zero_zil(ds, tx);
2686
2687 dsl_destroy_head_sync_impl(clone, tx);
2688
2689 dsl_dataset_rele(clone, FTAG);
2690 dsl_dataset_rele(ds, FTAG);
2691 }
2692
2693 /*
2694 * Rolls back the given filesystem or volume to the most recent snapshot.
2695 * The name of the most recent snapshot will be returned under key "target"
2696 * in the result nvlist.
2697 *
2698 * If owner != NULL:
2699 * - The existing dataset MUST be owned by the specified owner at entry
2700 * - Upon return, dataset will still be held by the same owner, whether we
2701 * succeed or not.
2702 *
2703 * This mode is required any time the existing filesystem is mounted. See
2704 * notes above zfs_suspend_fs() for further details.
2705 */
2706 int
2707 dsl_dataset_rollback(const char *fsname, const char *tosnap, void *owner,
2708 nvlist_t *result)
2709 {
2710 dsl_dataset_rollback_arg_t ddra;
2711
2712 ddra.ddra_fsname = fsname;
2713 ddra.ddra_tosnap = tosnap;
2714 ddra.ddra_owner = owner;
2715 ddra.ddra_result = result;
2716
2717 return (dsl_sync_task(fsname, dsl_dataset_rollback_check,
2718 dsl_dataset_rollback_sync, &ddra,
2719 1, ZFS_SPACE_CHECK_RESERVED));
2720 }
2721
2722 struct promotenode {
2723 list_node_t link;
2724 dsl_dataset_t *ds;
2725 };
2726
2727 static int snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep);
2728 static int promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp,
2729 void *tag);
2730 static void promote_rele(dsl_dataset_promote_arg_t *ddpa, void *tag);
2731
2732 int
2733 dsl_dataset_promote_check(void *arg, dmu_tx_t *tx)
2734 {
2735 dsl_dataset_promote_arg_t *ddpa = arg;
2736 dsl_pool_t *dp = dmu_tx_pool(tx);
2737 dsl_dataset_t *hds;
2738 struct promotenode *snap;
2739 dsl_dataset_t *origin_ds;
2740 int err;
2741 uint64_t unused;
2742 uint64_t ss_mv_cnt;
2743 size_t max_snap_len;
2744 boolean_t conflicting_snaps;
2745
2746 err = promote_hold(ddpa, dp, FTAG);
2747 if (err != 0)
2748 return (err);
2749
2750 hds = ddpa->ddpa_clone;
2751 snap = list_head(&ddpa->shared_snaps);
2752 origin_ds = snap->ds;
2753 max_snap_len = MAXNAMELEN - strlen(ddpa->ddpa_clonename) - 1;
2754
2755 snap = list_head(&ddpa->origin_snaps);
2756
2757 if (dsl_dataset_phys(hds)->ds_flags & DS_FLAG_NOPROMOTE) {
2758 promote_rele(ddpa, FTAG);
2759 return (SET_ERROR(EXDEV));
2760 }
2761
2762 /*
2763 * Compute and check the amount of space to transfer. Since this is
2764 * so expensive, don't do the preliminary check.
2765 */
2766 if (!dmu_tx_is_syncing(tx)) {
2767 promote_rele(ddpa, FTAG);
2768 return (0);
2769 }
2770
2771 /* compute origin's new unique space */
2772 snap = list_tail(&ddpa->clone_snaps);
2773 ASSERT3U(dsl_dataset_phys(snap->ds)->ds_prev_snap_obj, ==,
2774 origin_ds->ds_object);
2775 dsl_deadlist_space_range(&snap->ds->ds_deadlist,
2776 dsl_dataset_phys(origin_ds)->ds_prev_snap_txg, UINT64_MAX,
2777 &ddpa->unique, &unused, &unused);
2778
2779 /*
2780 * Walk the snapshots that we are moving
2781 *
2782 * Compute space to transfer. Consider the incremental changes
2783 * to used by each snapshot:
2784 * (my used) = (prev's used) + (blocks born) - (blocks killed)
2785 * So each snapshot gave birth to:
2786 * (blocks born) = (my used) - (prev's used) + (blocks killed)
2787 * So a sequence would look like:
2788 * (uN - u(N-1) + kN) + ... + (u1 - u0 + k1) + (u0 - 0 + k0)
2789 * Which simplifies to:
2790 * uN + kN + kN-1 + ... + k1 + k0
2791 * Note however, if we stop before we reach the ORIGIN we get:
2792 * uN + kN + kN-1 + ... + kM - uM-1
2793 */
2794 conflicting_snaps = B_FALSE;
2795 ss_mv_cnt = 0;
2796 ddpa->used = dsl_dataset_phys(origin_ds)->ds_referenced_bytes;
2797 ddpa->comp = dsl_dataset_phys(origin_ds)->ds_compressed_bytes;
2798 ddpa->uncomp = dsl_dataset_phys(origin_ds)->ds_uncompressed_bytes;
2799 for (snap = list_head(&ddpa->shared_snaps); snap;
2800 snap = list_next(&ddpa->shared_snaps, snap)) {
2801 uint64_t val, dlused, dlcomp, dluncomp;
2802 dsl_dataset_t *ds = snap->ds;
2803
2804 ss_mv_cnt++;
2805
2806 /*
2807 * If there are long holds, we won't be able to evict
2808 * the objset.
2809 */
2810 if (dsl_dataset_long_held(ds)) {
2811 err = SET_ERROR(EBUSY);
2812 goto out;
2813 }
2814
2815 /* Check that the snapshot name does not conflict */
2816 VERIFY0(dsl_dataset_get_snapname(ds));
2817 if (strlen(ds->ds_snapname) >= max_snap_len) {
2818 err = SET_ERROR(ENAMETOOLONG);
2819 goto out;
2820 }
2821 err = dsl_dataset_snap_lookup(hds, ds->ds_snapname, &val);
2822 if (err == 0) {
2823 fnvlist_add_boolean(ddpa->err_ds,
2824 snap->ds->ds_snapname);
2825 conflicting_snaps = B_TRUE;
2826 } else if (err != ENOENT) {
2827 goto out;
2828 }
2829
2830 /* The very first snapshot does not have a deadlist */
2831 if (dsl_dataset_phys(ds)->ds_prev_snap_obj == 0)
2832 continue;
2833
2834 dsl_deadlist_space(&ds->ds_deadlist,
2835 &dlused, &dlcomp, &dluncomp);
2836 ddpa->used += dlused;
2837 ddpa->comp += dlcomp;
2838 ddpa->uncomp += dluncomp;
2839 }
2840
2841 /*
2842 * In order to return the full list of conflicting snapshots, we check
2843 * whether there was a conflict after traversing all of them.
2844 */
2845 if (conflicting_snaps) {
2846 err = SET_ERROR(EEXIST);
2847 goto out;
2848 }
2849
2850 /*
2851 * If we are a clone of a clone then we never reached ORIGIN,
2852 * so we need to subtract out the clone origin's used space.
2853 */
2854 if (ddpa->origin_origin) {
2855 ddpa->used -=
2856 dsl_dataset_phys(ddpa->origin_origin)->ds_referenced_bytes;
2857 ddpa->comp -=
2858 dsl_dataset_phys(ddpa->origin_origin)->ds_compressed_bytes;
2859 ddpa->uncomp -=
2860 dsl_dataset_phys(ddpa->origin_origin)->
2861 ds_uncompressed_bytes;
2862 }
2863
2864 /* Check that there is enough space and limit headroom here */
2865 err = dsl_dir_transfer_possible(origin_ds->ds_dir, hds->ds_dir,
2866 0, ss_mv_cnt, ddpa->used, ddpa->cr);
2867 if (err != 0)
2868 goto out;
2869
2870 /*
2871 * Compute the amounts of space that will be used by snapshots
2872 * after the promotion (for both origin and clone). For each,
2873 * it is the amount of space that will be on all of their
2874 * deadlists (that was not born before their new origin).
2875 */
2876 if (dsl_dir_phys(hds->ds_dir)->dd_flags & DD_FLAG_USED_BREAKDOWN) {
2877 uint64_t space;
2878
2879 /*
2880 * Note, typically this will not be a clone of a clone,
2881 * so dd_origin_txg will be < TXG_INITIAL, so
2882 * these snaplist_space() -> dsl_deadlist_space_range()
2883 * calls will be fast because they do not have to
2884 * iterate over all bps.
2885 */
2886 snap = list_head(&ddpa->origin_snaps);
2887 err = snaplist_space(&ddpa->shared_snaps,
2888 snap->ds->ds_dir->dd_origin_txg, &ddpa->cloneusedsnap);
2889 if (err != 0)
2890 goto out;
2891
2892 err = snaplist_space(&ddpa->clone_snaps,
2893 snap->ds->ds_dir->dd_origin_txg, &space);
2894 if (err != 0)
2895 goto out;
2896 ddpa->cloneusedsnap += space;
2897 }
2898 if (dsl_dir_phys(origin_ds->ds_dir)->dd_flags &
2899 DD_FLAG_USED_BREAKDOWN) {
2900 err = snaplist_space(&ddpa->origin_snaps,
2901 dsl_dataset_phys(origin_ds)->ds_creation_txg,
2902 &ddpa->originusedsnap);
2903 if (err != 0)
2904 goto out;
2905 }
2906
2907 out:
2908 promote_rele(ddpa, FTAG);
2909 return (err);
2910 }
2911
2912 void
2913 dsl_dataset_promote_sync(void *arg, dmu_tx_t *tx)
2914 {
2915 dsl_dataset_promote_arg_t *ddpa = arg;
2916 dsl_pool_t *dp = dmu_tx_pool(tx);
2917 dsl_dataset_t *hds;
2918 struct promotenode *snap;
2919 dsl_dataset_t *origin_ds;
2920 dsl_dataset_t *origin_head;
2921 dsl_dir_t *dd;
2922 dsl_dir_t *odd = NULL;
2923 uint64_t oldnext_obj;
2924 int64_t delta;
2925
2926 VERIFY0(promote_hold(ddpa, dp, FTAG));
2927 hds = ddpa->ddpa_clone;
2928
2929 ASSERT0(dsl_dataset_phys(hds)->ds_flags & DS_FLAG_NOPROMOTE);
2930
2931 snap = list_head(&ddpa->shared_snaps);
2932 origin_ds = snap->ds;
2933 dd = hds->ds_dir;
2934
2935 snap = list_head(&ddpa->origin_snaps);
2936 origin_head = snap->ds;
2937
2938 /*
2939 * We need to explicitly open odd, since origin_ds's dd will be
2940 * changing.
2941 */
2942 VERIFY0(dsl_dir_hold_obj(dp, origin_ds->ds_dir->dd_object,
2943 NULL, FTAG, &odd));
2944
2945 /* change origin's next snap */
2946 dmu_buf_will_dirty(origin_ds->ds_dbuf, tx);
2947 oldnext_obj = dsl_dataset_phys(origin_ds)->ds_next_snap_obj;
2948 snap = list_tail(&ddpa->clone_snaps);
2949 ASSERT3U(dsl_dataset_phys(snap->ds)->ds_prev_snap_obj, ==,
2950 origin_ds->ds_object);
2951 dsl_dataset_phys(origin_ds)->ds_next_snap_obj = snap->ds->ds_object;
2952
2953 /* change the origin's next clone */
2954 if (dsl_dataset_phys(origin_ds)->ds_next_clones_obj) {
2955 dsl_dataset_remove_from_next_clones(origin_ds,
2956 snap->ds->ds_object, tx);
2957 VERIFY0(zap_add_int(dp->dp_meta_objset,
2958 dsl_dataset_phys(origin_ds)->ds_next_clones_obj,
2959 oldnext_obj, tx));
2960 }
2961
2962 /* change origin */
2963 dmu_buf_will_dirty(dd->dd_dbuf, tx);
2964 ASSERT3U(dsl_dir_phys(dd)->dd_origin_obj, ==, origin_ds->ds_object);
2965 dsl_dir_phys(dd)->dd_origin_obj = dsl_dir_phys(odd)->dd_origin_obj;
2966 dd->dd_origin_txg = origin_head->ds_dir->dd_origin_txg;
2967 dmu_buf_will_dirty(odd->dd_dbuf, tx);
2968 dsl_dir_phys(odd)->dd_origin_obj = origin_ds->ds_object;
2969 origin_head->ds_dir->dd_origin_txg =
2970 dsl_dataset_phys(origin_ds)->ds_creation_txg;
2971
2972 /* change dd_clone entries */
2973 if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) {
2974 VERIFY0(zap_remove_int(dp->dp_meta_objset,
2975 dsl_dir_phys(odd)->dd_clones, hds->ds_object, tx));
2976 VERIFY0(zap_add_int(dp->dp_meta_objset,
2977 dsl_dir_phys(ddpa->origin_origin->ds_dir)->dd_clones,
2978 hds->ds_object, tx));
2979
2980 VERIFY0(zap_remove_int(dp->dp_meta_objset,
2981 dsl_dir_phys(ddpa->origin_origin->ds_dir)->dd_clones,
2982 origin_head->ds_object, tx));
2983 if (dsl_dir_phys(dd)->dd_clones == 0) {
2984 dsl_dir_phys(dd)->dd_clones =
2985 zap_create(dp->dp_meta_objset, DMU_OT_DSL_CLONES,
2986 DMU_OT_NONE, 0, tx);
2987 }
2988 VERIFY0(zap_add_int(dp->dp_meta_objset,
2989 dsl_dir_phys(dd)->dd_clones, origin_head->ds_object, tx));
2990 }
2991
2992 /* move snapshots to this dir */
2993 for (snap = list_head(&ddpa->shared_snaps); snap;
2994 snap = list_next(&ddpa->shared_snaps, snap)) {
2995 dsl_dataset_t *ds = snap->ds;
2996
2997 /*
2998 * Property callbacks are registered to a particular
2999 * dsl_dir. Since ours is changing, evict the objset
3000 * so that they will be unregistered from the old dsl_dir.
3001 */
3002 if (ds->ds_objset) {
3003 dmu_objset_evict(ds->ds_objset);
3004 ds->ds_objset = NULL;
3005 }
3006
3007 /* move snap name entry */
3008 VERIFY0(dsl_dataset_get_snapname(ds));
3009 VERIFY0(dsl_dataset_snap_remove(origin_head,
3010 ds->ds_snapname, tx, B_TRUE));
3011 VERIFY0(zap_add(dp->dp_meta_objset,
3012 dsl_dataset_phys(hds)->ds_snapnames_zapobj, ds->ds_snapname,
3013 8, 1, &ds->ds_object, tx));
3014 dsl_fs_ss_count_adjust(hds->ds_dir, 1,
3015 DD_FIELD_SNAPSHOT_COUNT, tx);
3016
3017 /* change containing dsl_dir */
3018 dmu_buf_will_dirty(ds->ds_dbuf, tx);
3019 ASSERT3U(dsl_dataset_phys(ds)->ds_dir_obj, ==, odd->dd_object);
3020 dsl_dataset_phys(ds)->ds_dir_obj = dd->dd_object;
3021 ASSERT3P(ds->ds_dir, ==, odd);
3022 dsl_dir_rele(ds->ds_dir, ds);
3023 VERIFY0(dsl_dir_hold_obj(dp, dd->dd_object,
3024 NULL, ds, &ds->ds_dir));
3025
3026 /* move any clone references */
3027 if (dsl_dataset_phys(ds)->ds_next_clones_obj &&
3028 spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) {
3029 zap_cursor_t zc;
3030 zap_attribute_t za;
3031
3032 for (zap_cursor_init(&zc, dp->dp_meta_objset,
3033 dsl_dataset_phys(ds)->ds_next_clones_obj);
3034 zap_cursor_retrieve(&zc, &za) == 0;
3035 zap_cursor_advance(&zc)) {
3036 dsl_dataset_t *cnds;
3037 uint64_t o;
3038
3039 if (za.za_first_integer == oldnext_obj) {
3040 /*
3041 * We've already moved the
3042 * origin's reference.
3043 */
3044 continue;
3045 }
3046
3047 VERIFY0(dsl_dataset_hold_obj(dp,
3048 za.za_first_integer, FTAG, &cnds));
3049 o = dsl_dir_phys(cnds->ds_dir)->
3050 dd_head_dataset_obj;
3051
3052 VERIFY0(zap_remove_int(dp->dp_meta_objset,
3053 dsl_dir_phys(odd)->dd_clones, o, tx));
3054 VERIFY0(zap_add_int(dp->dp_meta_objset,
3055 dsl_dir_phys(dd)->dd_clones, o, tx));
3056 dsl_dataset_rele(cnds, FTAG);
3057 }
3058 zap_cursor_fini(&zc);
3059 }
3060
3061 ASSERT(!dsl_prop_hascb(ds));
3062 }
3063
3064 /*
3065 * Change space accounting.
3066 * Note, pa->*usedsnap and dd_used_breakdown[SNAP] will either
3067 * both be valid, or both be 0 (resulting in delta == 0). This
3068 * is true for each of {clone,origin} independently.
3069 */
3070
3071 delta = ddpa->cloneusedsnap -
3072 dsl_dir_phys(dd)->dd_used_breakdown[DD_USED_SNAP];
3073 ASSERT3S(delta, >=, 0);
3074 ASSERT3U(ddpa->used, >=, delta);
3075 dsl_dir_diduse_space(dd, DD_USED_SNAP, delta, 0, 0, tx);
3076 dsl_dir_diduse_space(dd, DD_USED_HEAD,
3077 ddpa->used - delta, ddpa->comp, ddpa->uncomp, tx);
3078
3079 delta = ddpa->originusedsnap -
3080 dsl_dir_phys(odd)->dd_used_breakdown[DD_USED_SNAP];
3081 ASSERT3S(delta, <=, 0);
3082 ASSERT3U(ddpa->used, >=, -delta);
3083 dsl_dir_diduse_space(odd, DD_USED_SNAP, delta, 0, 0, tx);
3084 dsl_dir_diduse_space(odd, DD_USED_HEAD,
3085 -ddpa->used - delta, -ddpa->comp, -ddpa->uncomp, tx);
3086
3087 dsl_dataset_phys(origin_ds)->ds_unique_bytes = ddpa->unique;
3088
3089 /* log history record */
3090 spa_history_log_internal_ds(hds, "promote", tx, "");
3091
3092 dsl_dir_rele(odd, FTAG);
3093 promote_rele(ddpa, FTAG);
3094 }
3095
3096 /*
3097 * Make a list of dsl_dataset_t's for the snapshots between first_obj
3098 * (exclusive) and last_obj (inclusive). The list will be in reverse
3099 * order (last_obj will be the list_head()). If first_obj == 0, do all
3100 * snapshots back to this dataset's origin.
3101 */
3102 static int
3103 snaplist_make(dsl_pool_t *dp,
3104 uint64_t first_obj, uint64_t last_obj, list_t *l, void *tag)
3105 {
3106 uint64_t obj = last_obj;
3107
3108 list_create(l, sizeof (struct promotenode),
3109 offsetof(struct promotenode, link));
3110
3111 while (obj != first_obj) {
3112 dsl_dataset_t *ds;
3113 struct promotenode *snap;
3114 int err;
3115
3116 err = dsl_dataset_hold_obj(dp, obj, tag, &ds);
3117 ASSERT(err != ENOENT);
3118 if (err != 0)
3119 return (err);
3120
3121 if (first_obj == 0)
3122 first_obj = dsl_dir_phys(ds->ds_dir)->dd_origin_obj;
3123
3124 snap = kmem_alloc(sizeof (*snap), KM_SLEEP);
3125 snap->ds = ds;
3126 list_insert_tail(l, snap);
3127 obj = dsl_dataset_phys(ds)->ds_prev_snap_obj;
3128 }
3129
3130 return (0);
3131 }
3132
3133 static int
3134 snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep)
3135 {
3136 struct promotenode *snap;
3137
3138 *spacep = 0;
3139 for (snap = list_head(l); snap; snap = list_next(l, snap)) {
3140 uint64_t used, comp, uncomp;
3141 dsl_deadlist_space_range(&snap->ds->ds_deadlist,
3142 mintxg, UINT64_MAX, &used, &comp, &uncomp);
3143 *spacep += used;
3144 }
3145 return (0);
3146 }
3147
3148 static void
3149 snaplist_destroy(list_t *l, void *tag)
3150 {
3151 struct promotenode *snap;
3152
3153 if (l == NULL || !list_link_active(&l->list_head))
3154 return;
3155
3156 while ((snap = list_tail(l)) != NULL) {
3157 list_remove(l, snap);
3158 dsl_dataset_rele(snap->ds, tag);
3159 kmem_free(snap, sizeof (*snap));
3160 }
3161 list_destroy(l);
3162 }
3163
3164 static int
3165 promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp, void *tag)
3166 {
3167 int error;
3168 dsl_dir_t *dd;
3169 struct promotenode *snap;
3170
3171 error = dsl_dataset_hold(dp, ddpa->ddpa_clonename, tag,
3172 &ddpa->ddpa_clone);
3173 if (error != 0)
3174 return (error);
3175 dd = ddpa->ddpa_clone->ds_dir;
3176
3177 if (ddpa->ddpa_clone->ds_is_snapshot ||
3178 !dsl_dir_is_clone(dd)) {
3179 dsl_dataset_rele(ddpa->ddpa_clone, tag);
3180 return (SET_ERROR(EINVAL));
3181 }
3182
3183 error = snaplist_make(dp, 0, dsl_dir_phys(dd)->dd_origin_obj,
3184 &ddpa->shared_snaps, tag);
3185 if (error != 0)
3186 goto out;
3187
3188 error = snaplist_make(dp, 0, ddpa->ddpa_clone->ds_object,
3189 &ddpa->clone_snaps, tag);
3190 if (error != 0)
3191 goto out;
3192
3193 snap = list_head(&ddpa->shared_snaps);
3194 ASSERT3U(snap->ds->ds_object, ==, dsl_dir_phys(dd)->dd_origin_obj);
3195 error = snaplist_make(dp, dsl_dir_phys(dd)->dd_origin_obj,
3196 dsl_dir_phys(snap->ds->ds_dir)->dd_head_dataset_obj,
3197 &ddpa->origin_snaps, tag);
3198 if (error != 0)
3199 goto out;
3200
3201 if (dsl_dir_phys(snap->ds->ds_dir)->dd_origin_obj != 0) {
3202 error = dsl_dataset_hold_obj(dp,
3203 dsl_dir_phys(snap->ds->ds_dir)->dd_origin_obj,
3204 tag, &ddpa->origin_origin);
3205 if (error != 0)
3206 goto out;
3207 }
3208 out:
3209 if (error != 0)
3210 promote_rele(ddpa, tag);
3211 return (error);
3212 }
3213
3214 static void
3215 promote_rele(dsl_dataset_promote_arg_t *ddpa, void *tag)
3216 {
3217 snaplist_destroy(&ddpa->shared_snaps, tag);
3218 snaplist_destroy(&ddpa->clone_snaps, tag);
3219 snaplist_destroy(&ddpa->origin_snaps, tag);
3220 if (ddpa->origin_origin != NULL)
3221 dsl_dataset_rele(ddpa->origin_origin, tag);
3222 dsl_dataset_rele(ddpa->ddpa_clone, tag);
3223 }
3224
3225 /*
3226 * Promote a clone.
3227 *
3228 * If it fails due to a conflicting snapshot name, "conflsnap" will be filled
3229 * in with the name. (It must be at least ZFS_MAX_DATASET_NAME_LEN bytes long.)
3230 */
3231 int
3232 dsl_dataset_promote(const char *name, char *conflsnap)
3233 {
3234 dsl_dataset_promote_arg_t ddpa = { 0 };
3235 uint64_t numsnaps;
3236 int error;
3237 nvpair_t *snap_pair;
3238 objset_t *os;
3239
3240 /*
3241 * We will modify space proportional to the number of
3242 * snapshots. Compute numsnaps.
3243 */
3244 error = dmu_objset_hold(name, FTAG, &os);
3245 if (error != 0)
3246 return (error);
3247 error = zap_count(dmu_objset_pool(os)->dp_meta_objset,
3248 dsl_dataset_phys(dmu_objset_ds(os))->ds_snapnames_zapobj,
3249 &numsnaps);
3250 dmu_objset_rele(os, FTAG);
3251 if (error != 0)
3252 return (error);
3253
3254 ddpa.ddpa_clonename = name;
3255 ddpa.err_ds = fnvlist_alloc();
3256 ddpa.cr = CRED();
3257
3258 error = dsl_sync_task(name, dsl_dataset_promote_check,
3259 dsl_dataset_promote_sync, &ddpa,
3260 2 + numsnaps, ZFS_SPACE_CHECK_RESERVED);
3261
3262 /*
3263 * Return the first conflicting snapshot found.
3264 */
3265 snap_pair = nvlist_next_nvpair(ddpa.err_ds, NULL);
3266 if (snap_pair != NULL && conflsnap != NULL)
3267 (void) strcpy(conflsnap, nvpair_name(snap_pair));
3268
3269 fnvlist_free(ddpa.err_ds);
3270 return (error);
3271 }
3272
3273 int
3274 dsl_dataset_clone_swap_check_impl(dsl_dataset_t *clone,
3275 dsl_dataset_t *origin_head, boolean_t force, void *owner, dmu_tx_t *tx)
3276 {
3277 /*
3278 * "slack" factor for received datasets with refquota set on them.
3279 * See the bottom of this function for details on its use.
3280 */
3281 uint64_t refquota_slack = DMU_MAX_ACCESS * spa_asize_inflation;
3282 int64_t unused_refres_delta;
3283
3284 /* they should both be heads */
3285 if (clone->ds_is_snapshot ||
3286 origin_head->ds_is_snapshot)
3287 return (SET_ERROR(EINVAL));
3288
3289 /* if we are not forcing, the branch point should be just before them */
3290 if (!force && clone->ds_prev != origin_head->ds_prev)
3291 return (SET_ERROR(EINVAL));
3292
3293 /* clone should be the clone (unless they are unrelated) */
3294 if (clone->ds_prev != NULL &&
3295 clone->ds_prev != clone->ds_dir->dd_pool->dp_origin_snap &&
3296 origin_head->ds_dir != clone->ds_prev->ds_dir)
3297 return (SET_ERROR(EINVAL));
3298
3299 /* the clone should be a child of the origin */
3300 if (clone->ds_dir->dd_parent != origin_head->ds_dir)
3301 return (SET_ERROR(EINVAL));
3302
3303 /* origin_head shouldn't be modified unless 'force' */
3304 if (!force &&
3305 dsl_dataset_modified_since_snap(origin_head, origin_head->ds_prev))
3306 return (SET_ERROR(ETXTBSY));
3307
3308 /* origin_head should have no long holds (e.g. is not mounted) */
3309 if (dsl_dataset_handoff_check(origin_head, owner, tx))
3310 return (SET_ERROR(EBUSY));
3311
3312 /* check amount of any unconsumed refreservation */
3313 unused_refres_delta =
3314 (int64_t)MIN(origin_head->ds_reserved,
3315 dsl_dataset_phys(origin_head)->ds_unique_bytes) -
3316 (int64_t)MIN(origin_head->ds_reserved,
3317 dsl_dataset_phys(clone)->ds_unique_bytes);
3318
3319 if (unused_refres_delta > 0 &&
3320 unused_refres_delta >
3321 dsl_dir_space_available(origin_head->ds_dir, NULL, 0, TRUE))
3322 return (SET_ERROR(ENOSPC));
3323
3324 /*
3325 * The clone can't be too much over the head's refquota.
3326 *
3327 * To ensure that the entire refquota can be used, we allow one
3328 * transaction to exceed the the refquota. Therefore, this check
3329 * needs to also allow for the space referenced to be more than the
3330 * refquota. The maximum amount of space that one transaction can use
3331 * on disk is DMU_MAX_ACCESS * spa_asize_inflation. Allowing this
3332 * overage ensures that we are able to receive a filesystem that
3333 * exceeds the refquota on the source system.
3334 *
3335 * So that overage is the refquota_slack we use below.
3336 */
3337 if (origin_head->ds_quota != 0 &&
3338 dsl_dataset_phys(clone)->ds_referenced_bytes >
3339 origin_head->ds_quota + refquota_slack)
3340 return (SET_ERROR(EDQUOT));
3341
3342 return (0);
3343 }
3344
3345 static void
3346 dsl_dataset_swap_remap_deadlists(dsl_dataset_t *clone,
3347 dsl_dataset_t *origin, dmu_tx_t *tx)
3348 {
3349 uint64_t clone_remap_dl_obj, origin_remap_dl_obj;
3350 dsl_pool_t *dp = dmu_tx_pool(tx);
3351
3352 ASSERT(dsl_pool_sync_context(dp));
3353
3354 clone_remap_dl_obj = dsl_dataset_get_remap_deadlist_object(clone);
3355 origin_remap_dl_obj = dsl_dataset_get_remap_deadlist_object(origin);
3356
3357 if (clone_remap_dl_obj != 0) {
3358 dsl_deadlist_close(&clone->ds_remap_deadlist);
3359 dsl_dataset_unset_remap_deadlist_object(clone, tx);
3360 }
3361 if (origin_remap_dl_obj != 0) {
3362 dsl_deadlist_close(&origin->ds_remap_deadlist);
3363 dsl_dataset_unset_remap_deadlist_object(origin, tx);
3364 }
3365
3366 if (clone_remap_dl_obj != 0) {
3367 dsl_dataset_set_remap_deadlist_object(origin,
3368 clone_remap_dl_obj, tx);
3369 dsl_deadlist_open(&origin->ds_remap_deadlist,
3370 dp->dp_meta_objset, clone_remap_dl_obj);
3371 }
3372 if (origin_remap_dl_obj != 0) {
3373 dsl_dataset_set_remap_deadlist_object(clone,
3374 origin_remap_dl_obj, tx);
3375 dsl_deadlist_open(&clone->ds_remap_deadlist,
3376 dp->dp_meta_objset, origin_remap_dl_obj);
3377 }
3378 }
3379
3380 void
3381 dsl_dataset_clone_swap_sync_impl(dsl_dataset_t *clone,
3382 dsl_dataset_t *origin_head, dmu_tx_t *tx)
3383 {
3384 dsl_pool_t *dp = dmu_tx_pool(tx);
3385 int64_t unused_refres_delta;
3386
3387 ASSERT(clone->ds_reserved == 0);
3388 /*
3389 * NOTE: On DEBUG kernels there could be a race between this and
3390 * the check function if spa_asize_inflation is adjusted...
3391 */
3392 ASSERT(origin_head->ds_quota == 0 ||
3393 dsl_dataset_phys(clone)->ds_unique_bytes <= origin_head->ds_quota +
3394 DMU_MAX_ACCESS * spa_asize_inflation);
3395 ASSERT3P(clone->ds_prev, ==, origin_head->ds_prev);
3396
3397 /*
3398 * Swap per-dataset feature flags.
3399 */
3400 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) {
3401 if (!(spa_feature_table[f].fi_flags &
3402 ZFEATURE_FLAG_PER_DATASET)) {
3403 ASSERT(!clone->ds_feature_inuse[f]);
3404 ASSERT(!origin_head->ds_feature_inuse[f]);
3405 continue;
3406 }
3407
3408 boolean_t clone_inuse = clone->ds_feature_inuse[f];
3409 boolean_t origin_head_inuse = origin_head->ds_feature_inuse[f];
3410
3411 if (clone_inuse) {
3412 dsl_dataset_deactivate_feature(clone->ds_object, f, tx);
3413 clone->ds_feature_inuse[f] = B_FALSE;
3414 }
3415 if (origin_head_inuse) {
3416 dsl_dataset_deactivate_feature(origin_head->ds_object,
3417 f, tx);
3418 origin_head->ds_feature_inuse[f] = B_FALSE;
3419 }
3420 if (clone_inuse) {
3421 dsl_dataset_activate_feature(origin_head->ds_object,
3422 f, tx);
3423 origin_head->ds_feature_inuse[f] = B_TRUE;
3424 }
3425 if (origin_head_inuse) {
3426 dsl_dataset_activate_feature(clone->ds_object, f, tx);
3427 clone->ds_feature_inuse[f] = B_TRUE;
3428 }
3429 }
3430
3431 dmu_buf_will_dirty(clone->ds_dbuf, tx);
3432 dmu_buf_will_dirty(origin_head->ds_dbuf, tx);
3433
3434 if (clone->ds_objset != NULL) {
3435 dmu_objset_evict(clone->ds_objset);
3436 clone->ds_objset = NULL;
3437 }
3438
3439 if (origin_head->ds_objset != NULL) {
3440 dmu_objset_evict(origin_head->ds_objset);
3441 origin_head->ds_objset = NULL;
3442 }
3443
3444 unused_refres_delta =
3445 (int64_t)MIN(origin_head->ds_reserved,
3446 dsl_dataset_phys(origin_head)->ds_unique_bytes) -
3447 (int64_t)MIN(origin_head->ds_reserved,
3448 dsl_dataset_phys(clone)->ds_unique_bytes);
3449
3450 /*
3451 * Reset origin's unique bytes, if it exists.
3452 */
3453 if (clone->ds_prev) {
3454 dsl_dataset_t *origin = clone->ds_prev;
3455 uint64_t comp, uncomp;
3456
3457 dmu_buf_will_dirty(origin->ds_dbuf, tx);
3458 dsl_deadlist_space_range(&clone->ds_deadlist,
3459 dsl_dataset_phys(origin)->ds_prev_snap_txg, UINT64_MAX,
3460 &dsl_dataset_phys(origin)->ds_unique_bytes, &comp, &uncomp);
3461 }
3462
3463 /* swap blkptrs */
3464 {
3465 rrw_enter(&clone->ds_bp_rwlock, RW_WRITER, FTAG);
3466 rrw_enter(&origin_head->ds_bp_rwlock, RW_WRITER, FTAG);
3467 blkptr_t tmp;
3468 tmp = dsl_dataset_phys(origin_head)->ds_bp;
3469 dsl_dataset_phys(origin_head)->ds_bp =
3470 dsl_dataset_phys(clone)->ds_bp;
3471 dsl_dataset_phys(clone)->ds_bp = tmp;
3472 rrw_exit(&origin_head->ds_bp_rwlock, FTAG);
3473 rrw_exit(&clone->ds_bp_rwlock, FTAG);
3474 }
3475
3476 /* set dd_*_bytes */
3477 {
3478 int64_t dused, dcomp, duncomp;
3479 uint64_t cdl_used, cdl_comp, cdl_uncomp;
3480 uint64_t odl_used, odl_comp, odl_uncomp;
3481
3482 ASSERT3U(dsl_dir_phys(clone->ds_dir)->
3483 dd_used_breakdown[DD_USED_SNAP], ==, 0);
3484
3485 dsl_deadlist_space(&clone->ds_deadlist,
3486 &cdl_used, &cdl_comp, &cdl_uncomp);
3487 dsl_deadlist_space(&origin_head->ds_deadlist,
3488 &odl_used, &odl_comp, &odl_uncomp);
3489
3490 dused = dsl_dataset_phys(clone)->ds_referenced_bytes +
3491 cdl_used -
3492 (dsl_dataset_phys(origin_head)->ds_referenced_bytes +
3493 odl_used);
3494 dcomp = dsl_dataset_phys(clone)->ds_compressed_bytes +
3495 cdl_comp -
3496 (dsl_dataset_phys(origin_head)->ds_compressed_bytes +
3497 odl_comp);
3498 duncomp = dsl_dataset_phys(clone)->ds_uncompressed_bytes +
3499 cdl_uncomp -
3500 (dsl_dataset_phys(origin_head)->ds_uncompressed_bytes +
3501 odl_uncomp);
3502
3503 dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_HEAD,
3504 dused, dcomp, duncomp, tx);
3505 dsl_dir_diduse_space(clone->ds_dir, DD_USED_HEAD,
3506 -dused, -dcomp, -duncomp, tx);
3507
3508 /*
3509 * The difference in the space used by snapshots is the
3510 * difference in snapshot space due to the head's
3511 * deadlist (since that's the only thing that's
3512 * changing that affects the snapused).
3513 */
3514 dsl_deadlist_space_range(&clone->ds_deadlist,
3515 origin_head->ds_dir->dd_origin_txg, UINT64_MAX,
3516 &cdl_used, &cdl_comp, &cdl_uncomp);
3517 dsl_deadlist_space_range(&origin_head->ds_deadlist,
3518 origin_head->ds_dir->dd_origin_txg, UINT64_MAX,
3519 &odl_used, &odl_comp, &odl_uncomp);
3520 dsl_dir_transfer_space(origin_head->ds_dir, cdl_used - odl_used,
3521 DD_USED_HEAD, DD_USED_SNAP, tx);
3522 }
3523
3524 /* swap ds_*_bytes */
3525 SWITCH64(dsl_dataset_phys(origin_head)->ds_referenced_bytes,
3526 dsl_dataset_phys(clone)->ds_referenced_bytes);
3527 SWITCH64(dsl_dataset_phys(origin_head)->ds_compressed_bytes,
3528 dsl_dataset_phys(clone)->ds_compressed_bytes);
3529 SWITCH64(dsl_dataset_phys(origin_head)->ds_uncompressed_bytes,
3530 dsl_dataset_phys(clone)->ds_uncompressed_bytes);
3531 SWITCH64(dsl_dataset_phys(origin_head)->ds_unique_bytes,
3532 dsl_dataset_phys(clone)->ds_unique_bytes);
3533
3534 /* apply any parent delta for change in unconsumed refreservation */
3535 dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_REFRSRV,
3536 unused_refres_delta, 0, 0, tx);
3537
3538 /*
3539 * Swap deadlists.
3540 */
3541 dsl_deadlist_close(&clone->ds_deadlist);
3542 dsl_deadlist_close(&origin_head->ds_deadlist);
3543 SWITCH64(dsl_dataset_phys(origin_head)->ds_deadlist_obj,
3544 dsl_dataset_phys(clone)->ds_deadlist_obj);
3545 dsl_deadlist_open(&clone->ds_deadlist, dp->dp_meta_objset,
3546 dsl_dataset_phys(clone)->ds_deadlist_obj);
3547 dsl_deadlist_open(&origin_head->ds_deadlist, dp->dp_meta_objset,
3548 dsl_dataset_phys(origin_head)->ds_deadlist_obj);
3549 dsl_dataset_swap_remap_deadlists(clone, origin_head, tx);
3550
3551 dsl_scan_ds_clone_swapped(origin_head, clone, tx);
3552
3553 spa_history_log_internal_ds(clone, "clone swap", tx,
3554 "parent=%s", origin_head->ds_dir->dd_myname);
3555 }
3556
3557 /*
3558 * Given a pool name and a dataset object number in that pool,
3559 * return the name of that dataset.
3560 */
3561 int
3562 dsl_dsobj_to_dsname(char *pname, uint64_t obj, char *buf)
3563 {
3564 dsl_pool_t *dp;
3565 dsl_dataset_t *ds;
3566 int error;
3567
3568 error = dsl_pool_hold(pname, FTAG, &dp);
3569 if (error != 0)
3570 return (error);
3571
3572 error = dsl_dataset_hold_obj(dp, obj, FTAG, &ds);
3573 if (error == 0) {
3574 dsl_dataset_name(ds, buf);
3575 dsl_dataset_rele(ds, FTAG);
3576 }
3577 dsl_pool_rele(dp, FTAG);
3578
3579 return (error);
3580 }
3581
3582 int
3583 dsl_dataset_check_quota(dsl_dataset_t *ds, boolean_t check_quota,
3584 uint64_t asize, uint64_t inflight, uint64_t *used, uint64_t *ref_rsrv)
3585 {
3586 int error = 0;
3587
3588 ASSERT3S(asize, >, 0);
3589
3590 /*
3591 * *ref_rsrv is the portion of asize that will come from any
3592 * unconsumed refreservation space.
3593 */
3594 *ref_rsrv = 0;
3595
3596 mutex_enter(&ds->ds_lock);
3597 /*
3598 * Make a space adjustment for reserved bytes.
3599 */
3600 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes) {
3601 ASSERT3U(*used, >=,
3602 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes);
3603 *used -=
3604 (ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes);
3605 *ref_rsrv =
3606 asize - MIN(asize, parent_delta(ds, asize + inflight));
3607 }
3608
3609 if (!check_quota || ds->ds_quota == 0) {
3610 mutex_exit(&ds->ds_lock);
3611 return (0);
3612 }
3613 /*
3614 * If they are requesting more space, and our current estimate
3615 * is over quota, they get to try again unless the actual
3616 * on-disk is over quota and there are no pending changes (which
3617 * may free up space for us).
3618 */
3619 if (dsl_dataset_phys(ds)->ds_referenced_bytes + inflight >=
3620 ds->ds_quota) {
3621 if (inflight > 0 ||
3622 dsl_dataset_phys(ds)->ds_referenced_bytes < ds->ds_quota)
3623 error = SET_ERROR(ERESTART);
3624 else
3625 error = SET_ERROR(EDQUOT);
3626 }
3627 mutex_exit(&ds->ds_lock);
3628
3629 return (error);
3630 }
3631
3632 typedef struct dsl_dataset_set_qr_arg {
3633 const char *ddsqra_name;
3634 zprop_source_t ddsqra_source;
3635 uint64_t ddsqra_value;
3636 } dsl_dataset_set_qr_arg_t;
3637
3638
3639 /* ARGSUSED */
3640 static int
3641 dsl_dataset_set_refquota_check(void *arg, dmu_tx_t *tx)
3642 {
3643 dsl_dataset_set_qr_arg_t *ddsqra = arg;
3644 dsl_pool_t *dp = dmu_tx_pool(tx);
3645 dsl_dataset_t *ds;
3646 int error;
3647 uint64_t newval;
3648
3649 if (spa_version(dp->dp_spa) < SPA_VERSION_REFQUOTA)
3650 return (SET_ERROR(ENOTSUP));
3651
3652 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds);
3653 if (error != 0)
3654 return (error);
3655
3656 if (ds->ds_is_snapshot) {
3657 dsl_dataset_rele(ds, FTAG);
3658 return (SET_ERROR(EINVAL));
3659 }
3660
3661 error = dsl_prop_predict(ds->ds_dir,
3662 zfs_prop_to_name(ZFS_PROP_REFQUOTA),
3663 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval);
3664 if (error != 0) {
3665 dsl_dataset_rele(ds, FTAG);
3666 return (error);
3667 }
3668
3669 if (newval == 0) {
3670 dsl_dataset_rele(ds, FTAG);
3671 return (0);
3672 }
3673
3674 if (newval < dsl_dataset_phys(ds)->ds_referenced_bytes ||
3675 newval < ds->ds_reserved) {
3676 dsl_dataset_rele(ds, FTAG);
3677 return (SET_ERROR(ENOSPC));
3678 }
3679
3680 dsl_dataset_rele(ds, FTAG);
3681 return (0);
3682 }
3683
3684 static void
3685 dsl_dataset_set_refquota_sync(void *arg, dmu_tx_t *tx)
3686 {
3687 dsl_dataset_set_qr_arg_t *ddsqra = arg;
3688 dsl_pool_t *dp = dmu_tx_pool(tx);
3689 dsl_dataset_t *ds;
3690 uint64_t newval;
3691
3692 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds));
3693
3694 dsl_prop_set_sync_impl(ds,
3695 zfs_prop_to_name(ZFS_PROP_REFQUOTA),
3696 ddsqra->ddsqra_source, sizeof (ddsqra->ddsqra_value), 1,
3697 &ddsqra->ddsqra_value, tx);
3698
3699 VERIFY0(dsl_prop_get_int_ds(ds,
3700 zfs_prop_to_name(ZFS_PROP_REFQUOTA), &newval));
3701
3702 if (ds->ds_quota != newval) {
3703 dmu_buf_will_dirty(ds->ds_dbuf, tx);
3704 ds->ds_quota = newval;
3705 }
3706 dsl_dataset_rele(ds, FTAG);
3707 }
3708
3709 int
3710 dsl_dataset_set_refquota(const char *dsname, zprop_source_t source,
3711 uint64_t refquota)
3712 {
3713 dsl_dataset_set_qr_arg_t ddsqra;
3714
3715 ddsqra.ddsqra_name = dsname;
3716 ddsqra.ddsqra_source = source;
3717 ddsqra.ddsqra_value = refquota;
3718
3719 return (dsl_sync_task(dsname, dsl_dataset_set_refquota_check,
3720 dsl_dataset_set_refquota_sync, &ddsqra, 0, ZFS_SPACE_CHECK_NONE));
3721 }
3722
3723 static int
3724 dsl_dataset_set_refreservation_check(void *arg, dmu_tx_t *tx)
3725 {
3726 dsl_dataset_set_qr_arg_t *ddsqra = arg;
3727 dsl_pool_t *dp = dmu_tx_pool(tx);
3728 dsl_dataset_t *ds;
3729 int error;
3730 uint64_t newval, unique;
3731
3732 if (spa_version(dp->dp_spa) < SPA_VERSION_REFRESERVATION)
3733 return (SET_ERROR(ENOTSUP));
3734
3735 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds);
3736 if (error != 0)
3737 return (error);
3738
3739 if (ds->ds_is_snapshot) {
3740 dsl_dataset_rele(ds, FTAG);
3741 return (SET_ERROR(EINVAL));
3742 }
3743
3744 error = dsl_prop_predict(ds->ds_dir,
3745 zfs_prop_to_name(ZFS_PROP_REFRESERVATION),
3746 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval);
3747 if (error != 0) {
3748 dsl_dataset_rele(ds, FTAG);
3749 return (error);
3750 }
3751
3752 /*
3753 * If we are doing the preliminary check in open context, the
3754 * space estimates may be inaccurate.
3755 */
3756 if (!dmu_tx_is_syncing(tx)) {
3757 dsl_dataset_rele(ds, FTAG);
3758 return (0);
3759 }
3760
3761 mutex_enter(&ds->ds_lock);
3762 if (!DS_UNIQUE_IS_ACCURATE(ds))
3763 dsl_dataset_recalc_head_uniq(ds);
3764 unique = dsl_dataset_phys(ds)->ds_unique_bytes;
3765 mutex_exit(&ds->ds_lock);
3766
3767 if (MAX(unique, newval) > MAX(unique, ds->ds_reserved)) {
3768 uint64_t delta = MAX(unique, newval) -
3769 MAX(unique, ds->ds_reserved);
3770
3771 if (delta >
3772 dsl_dir_space_available(ds->ds_dir, NULL, 0, B_TRUE) ||
3773 (ds->ds_quota > 0 && newval > ds->ds_quota)) {
3774 dsl_dataset_rele(ds, FTAG);
3775 return (SET_ERROR(ENOSPC));
3776 }
3777 }
3778
3779 dsl_dataset_rele(ds, FTAG);
3780 return (0);
3781 }
3782
3783 void
3784 dsl_dataset_set_refreservation_sync_impl(dsl_dataset_t *ds,
3785 zprop_source_t source, uint64_t value, dmu_tx_t *tx)
3786 {
3787 uint64_t newval;
3788 uint64_t unique;
3789 int64_t delta;
3790
3791 dsl_prop_set_sync_impl(ds, zfs_prop_to_name(ZFS_PROP_REFRESERVATION),
3792 source, sizeof (value), 1, &value, tx);
3793
3794 VERIFY0(dsl_prop_get_int_ds(ds,
3795 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), &newval));
3796
3797 dmu_buf_will_dirty(ds->ds_dbuf, tx);
3798 mutex_enter(&ds->ds_dir->dd_lock);
3799 mutex_enter(&ds->ds_lock);
3800 ASSERT(DS_UNIQUE_IS_ACCURATE(ds));
3801 unique = dsl_dataset_phys(ds)->ds_unique_bytes;
3802 delta = MAX(0, (int64_t)(newval - unique)) -
3803 MAX(0, (int64_t)(ds->ds_reserved - unique));
3804 ds->ds_reserved = newval;
3805 mutex_exit(&ds->ds_lock);
3806
3807 dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV, delta, 0, 0, tx);
3808 mutex_exit(&ds->ds_dir->dd_lock);
3809 }
3810
3811 static void
3812 dsl_dataset_set_refreservation_sync(void *arg, dmu_tx_t *tx)
3813 {
3814 dsl_dataset_set_qr_arg_t *ddsqra = arg;
3815 dsl_pool_t *dp = dmu_tx_pool(tx);
3816 dsl_dataset_t *ds;
3817
3818 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds));
3819 dsl_dataset_set_refreservation_sync_impl(ds,
3820 ddsqra->ddsqra_source, ddsqra->ddsqra_value, tx);
3821 dsl_dataset_rele(ds, FTAG);
3822 }
3823
3824 int
3825 dsl_dataset_set_refreservation(const char *dsname, zprop_source_t source,
3826 uint64_t refreservation)
3827 {
3828 dsl_dataset_set_qr_arg_t ddsqra;
3829
3830 ddsqra.ddsqra_name = dsname;
3831 ddsqra.ddsqra_source = source;
3832 ddsqra.ddsqra_value = refreservation;
3833
3834 return (dsl_sync_task(dsname, dsl_dataset_set_refreservation_check,
3835 dsl_dataset_set_refreservation_sync, &ddsqra,
3836 0, ZFS_SPACE_CHECK_NONE));
3837 }
3838
3839 /*
3840 * Return (in *usedp) the amount of space written in new that is not
3841 * present in oldsnap. New may be a snapshot or the head. Old must be
3842 * a snapshot before new, in new's filesystem (or its origin). If not then
3843 * fail and return EINVAL.
3844 *
3845 * The written space is calculated by considering two components: First, we
3846 * ignore any freed space, and calculate the written as new's used space
3847 * minus old's used space. Next, we add in the amount of space that was freed
3848 * between the two snapshots, thus reducing new's used space relative to old's.
3849 * Specifically, this is the space that was born before old->ds_creation_txg,
3850 * and freed before new (ie. on new's deadlist or a previous deadlist).
3851 *
3852 * space freed [---------------------]
3853 * snapshots ---O-------O--------O-------O------
3854 * oldsnap new
3855 */
3856 int
3857 dsl_dataset_space_written(dsl_dataset_t *oldsnap, dsl_dataset_t *new,
3858 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp)
3859 {
3860 int err = 0;
3861 uint64_t snapobj;
3862 dsl_pool_t *dp = new->ds_dir->dd_pool;
3863
3864 ASSERT(dsl_pool_config_held(dp));
3865
3866 *usedp = 0;
3867 *usedp += dsl_dataset_phys(new)->ds_referenced_bytes;
3868 *usedp -= dsl_dataset_phys(oldsnap)->ds_referenced_bytes;
3869
3870 *compp = 0;
3871 *compp += dsl_dataset_phys(new)->ds_compressed_bytes;
3872 *compp -= dsl_dataset_phys(oldsnap)->ds_compressed_bytes;
3873
3874 *uncompp = 0;
3875 *uncompp += dsl_dataset_phys(new)->ds_uncompressed_bytes;
3876 *uncompp -= dsl_dataset_phys(oldsnap)->ds_uncompressed_bytes;
3877
3878 snapobj = new->ds_object;
3879 while (snapobj != oldsnap->ds_object) {
3880 dsl_dataset_t *snap;
3881 uint64_t used, comp, uncomp;
3882
3883 if (snapobj == new->ds_object) {
3884 snap = new;
3885 } else {
3886 err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &snap);
3887 if (err != 0)
3888 break;
3889 }
3890
3891 if (dsl_dataset_phys(snap)->ds_prev_snap_txg ==
3892 dsl_dataset_phys(oldsnap)->ds_creation_txg) {
3893 /*
3894 * The blocks in the deadlist can not be born after
3895 * ds_prev_snap_txg, so get the whole deadlist space,
3896 * which is more efficient (especially for old-format
3897 * deadlists). Unfortunately the deadlist code
3898 * doesn't have enough information to make this
3899 * optimization itself.
3900 */
3901 dsl_deadlist_space(&snap->ds_deadlist,
3902 &used, &comp, &uncomp);
3903 } else {
3904 dsl_deadlist_space_range(&snap->ds_deadlist,
3905 0, dsl_dataset_phys(oldsnap)->ds_creation_txg,
3906 &used, &comp, &uncomp);
3907 }
3908 *usedp += used;
3909 *compp += comp;
3910 *uncompp += uncomp;
3911
3912 /*
3913 * If we get to the beginning of the chain of snapshots
3914 * (ds_prev_snap_obj == 0) before oldsnap, then oldsnap
3915 * was not a snapshot of/before new.
3916 */
3917 snapobj = dsl_dataset_phys(snap)->ds_prev_snap_obj;
3918 if (snap != new)
3919 dsl_dataset_rele(snap, FTAG);
3920 if (snapobj == 0) {
3921 err = SET_ERROR(EINVAL);
3922 break;
3923 }
3924
3925 }
3926 return (err);
3927 }
3928
3929 /*
3930 * Return (in *usedp) the amount of space that will be reclaimed if firstsnap,
3931 * lastsnap, and all snapshots in between are deleted.
3932 *
3933 * blocks that would be freed [---------------------------]
3934 * snapshots ---O-------O--------O-------O--------O
3935 * firstsnap lastsnap
3936 *
3937 * This is the set of blocks that were born after the snap before firstsnap,
3938 * (birth > firstsnap->prev_snap_txg) and died before the snap after the
3939 * last snap (ie, is on lastsnap->ds_next->ds_deadlist or an earlier deadlist).
3940 * We calculate this by iterating over the relevant deadlists (from the snap
3941 * after lastsnap, backward to the snap after firstsnap), summing up the
3942 * space on the deadlist that was born after the snap before firstsnap.
3943 */
3944 int
3945 dsl_dataset_space_wouldfree(dsl_dataset_t *firstsnap,
3946 dsl_dataset_t *lastsnap,
3947 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp)
3948 {
3949 int err = 0;
3950 uint64_t snapobj;
3951 dsl_pool_t *dp = firstsnap->ds_dir->dd_pool;
3952
3953 ASSERT(firstsnap->ds_is_snapshot);
3954 ASSERT(lastsnap->ds_is_snapshot);
3955
3956 /*
3957 * Check that the snapshots are in the same dsl_dir, and firstsnap
3958 * is before lastsnap.
3959 */
3960 if (firstsnap->ds_dir != lastsnap->ds_dir ||
3961 dsl_dataset_phys(firstsnap)->ds_creation_txg >
3962 dsl_dataset_phys(lastsnap)->ds_creation_txg)
3963 return (SET_ERROR(EINVAL));
3964
3965 *usedp = *compp = *uncompp = 0;
3966
3967 snapobj = dsl_dataset_phys(lastsnap)->ds_next_snap_obj;
3968 while (snapobj != firstsnap->ds_object) {
3969 dsl_dataset_t *ds;
3970 uint64_t used, comp, uncomp;
3971
3972 err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &ds);
3973 if (err != 0)
3974 break;
3975
3976 dsl_deadlist_space_range(&ds->ds_deadlist,
3977 dsl_dataset_phys(firstsnap)->ds_prev_snap_txg, UINT64_MAX,
3978 &used, &comp, &uncomp);
3979 *usedp += used;
3980 *compp += comp;
3981 *uncompp += uncomp;
3982
3983 snapobj = dsl_dataset_phys(ds)->ds_prev_snap_obj;
3984 ASSERT3U(snapobj, !=, 0);
3985 dsl_dataset_rele(ds, FTAG);
3986 }
3987 return (err);
3988 }
3989
3990 /*
3991 * Return TRUE if 'earlier' is an earlier snapshot in 'later's timeline.
3992 * For example, they could both be snapshots of the same filesystem, and
3993 * 'earlier' is before 'later'. Or 'earlier' could be the origin of
3994 * 'later's filesystem. Or 'earlier' could be an older snapshot in the origin's
3995 * filesystem. Or 'earlier' could be the origin's origin.
3996 *
3997 * If non-zero, earlier_txg is used instead of earlier's ds_creation_txg.
3998 */
3999 boolean_t
4000 dsl_dataset_is_before(dsl_dataset_t *later, dsl_dataset_t *earlier,
4001 uint64_t earlier_txg)
4002 {
4003 dsl_pool_t *dp = later->ds_dir->dd_pool;
4004 int error;
4005 boolean_t ret;
4006
4007 ASSERT(dsl_pool_config_held(dp));
4008 ASSERT(earlier->ds_is_snapshot || earlier_txg != 0);
4009
4010 if (earlier_txg == 0)
4011 earlier_txg = dsl_dataset_phys(earlier)->ds_creation_txg;
4012
4013 if (later->ds_is_snapshot &&
4014 earlier_txg >= dsl_dataset_phys(later)->ds_creation_txg)
4015 return (B_FALSE);
4016
4017 if (later->ds_dir == earlier->ds_dir)
4018 return (B_TRUE);
4019 if (!dsl_dir_is_clone(later->ds_dir))
4020 return (B_FALSE);
4021
4022 if (dsl_dir_phys(later->ds_dir)->dd_origin_obj == earlier->ds_object)
4023 return (B_TRUE);
4024 dsl_dataset_t *origin;
4025 error = dsl_dataset_hold_obj(dp,
4026 dsl_dir_phys(later->ds_dir)->dd_origin_obj, FTAG, &origin);
4027 if (error != 0)
4028 return (B_FALSE);
4029 ret = dsl_dataset_is_before(origin, earlier, earlier_txg);
4030 dsl_dataset_rele(origin, FTAG);
4031 return (ret);
4032 }
4033
4034 void
4035 dsl_dataset_zapify(dsl_dataset_t *ds, dmu_tx_t *tx)
4036 {
4037 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
4038 dmu_object_zapify(mos, ds->ds_object, DMU_OT_DSL_DATASET, tx);
4039 }
4040
4041 boolean_t
4042 dsl_dataset_is_zapified(dsl_dataset_t *ds)
4043 {
4044 dmu_object_info_t doi;
4045
4046 dmu_object_info_from_db(ds->ds_dbuf, &doi);
4047 return (doi.doi_type == DMU_OTN_ZAP_METADATA);
4048 }
4049
4050 boolean_t
4051 dsl_dataset_has_resume_receive_state(dsl_dataset_t *ds)
4052 {
4053 return (dsl_dataset_is_zapified(ds) &&
4054 zap_contains(ds->ds_dir->dd_pool->dp_meta_objset,
4055 ds->ds_object, DS_FIELD_RESUME_TOGUID) == 0);
4056 }
4057
4058 uint64_t
4059 dsl_dataset_get_remap_deadlist_object(dsl_dataset_t *ds)
4060 {
4061 uint64_t remap_deadlist_obj;
4062 int err;
4063
4064 if (!dsl_dataset_is_zapified(ds))
4065 return (0);
4066
4067 err = zap_lookup(ds->ds_dir->dd_pool->dp_meta_objset, ds->ds_object,
4068 DS_FIELD_REMAP_DEADLIST, sizeof (remap_deadlist_obj), 1,
4069 &remap_deadlist_obj);
4070
4071 if (err != 0) {
4072 VERIFY3S(err, ==, ENOENT);
4073 return (0);
4074 }
4075
4076 ASSERT(remap_deadlist_obj != 0);
4077 return (remap_deadlist_obj);
4078 }
4079
4080 boolean_t
4081 dsl_dataset_remap_deadlist_exists(dsl_dataset_t *ds)
4082 {
4083 EQUIV(dsl_deadlist_is_open(&ds->ds_remap_deadlist),
4084 dsl_dataset_get_remap_deadlist_object(ds) != 0);
4085 return (dsl_deadlist_is_open(&ds->ds_remap_deadlist));
4086 }
4087
4088 static void
4089 dsl_dataset_set_remap_deadlist_object(dsl_dataset_t *ds, uint64_t obj,
4090 dmu_tx_t *tx)
4091 {
4092 ASSERT(obj != 0);
4093 dsl_dataset_zapify(ds, tx);
4094 VERIFY0(zap_add(ds->ds_dir->dd_pool->dp_meta_objset, ds->ds_object,
4095 DS_FIELD_REMAP_DEADLIST, sizeof (obj), 1, &obj, tx));
4096 }
4097
4098 static void
4099 dsl_dataset_unset_remap_deadlist_object(dsl_dataset_t *ds, dmu_tx_t *tx)
4100 {
4101 VERIFY0(zap_remove(ds->ds_dir->dd_pool->dp_meta_objset,
4102 ds->ds_object, DS_FIELD_REMAP_DEADLIST, tx));
4103 }
4104
4105 void
4106 dsl_dataset_destroy_remap_deadlist(dsl_dataset_t *ds, dmu_tx_t *tx)
4107 {
4108 uint64_t remap_deadlist_object;
4109 spa_t *spa = ds->ds_dir->dd_pool->dp_spa;
4110
4111 ASSERT(dmu_tx_is_syncing(tx));
4112 ASSERT(dsl_dataset_remap_deadlist_exists(ds));
4113
4114 remap_deadlist_object = ds->ds_remap_deadlist.dl_object;
4115 dsl_deadlist_close(&ds->ds_remap_deadlist);
4116 dsl_deadlist_free(spa_meta_objset(spa), remap_deadlist_object, tx);
4117 dsl_dataset_unset_remap_deadlist_object(ds, tx);
4118 spa_feature_decr(spa, SPA_FEATURE_OBSOLETE_COUNTS, tx);
4119 }
4120
4121 void
4122 dsl_dataset_create_remap_deadlist(dsl_dataset_t *ds, dmu_tx_t *tx)
4123 {
4124 uint64_t remap_deadlist_obj;
4125 spa_t *spa = ds->ds_dir->dd_pool->dp_spa;
4126
4127 ASSERT(dmu_tx_is_syncing(tx));
4128 ASSERT(MUTEX_HELD(&ds->ds_remap_deadlist_lock));
4129 /*
4130 * Currently we only create remap deadlists when there are indirect
4131 * vdevs with referenced mappings.
4132 */
4133 ASSERT(spa_feature_is_active(spa, SPA_FEATURE_DEVICE_REMOVAL));
4134
4135 remap_deadlist_obj = dsl_deadlist_clone(
4136 &ds->ds_deadlist, UINT64_MAX,
4137 dsl_dataset_phys(ds)->ds_prev_snap_obj, tx);
4138 dsl_dataset_set_remap_deadlist_object(ds,
4139 remap_deadlist_obj, tx);
4140 dsl_deadlist_open(&ds->ds_remap_deadlist, spa_meta_objset(spa),
4141 remap_deadlist_obj);
4142 spa_feature_incr(spa, SPA_FEATURE_OBSOLETE_COUNTS, tx);
4143 }