1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21 /*
22 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
23 * Portions Copyright (c) 2011 Martin Matuska <mm@FreeBSD.org>
24 * Copyright (c) 2011, 2016 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 */
31
32 #include <sys/dmu_objset.h>
33 #include <sys/dsl_dataset.h>
34 #include <sys/dsl_dir.h>
35 #include <sys/dsl_prop.h>
36 #include <sys/dsl_synctask.h>
37 #include <sys/dmu_traverse.h>
38 #include <sys/dmu_impl.h>
39 #include <sys/dmu_send.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/zfs_znode.h>
50 #include <sys/zfs_onexit.h>
51 #include <sys/zvol.h>
52 #include <sys/dsl_scan.h>
53 #include <sys/dsl_deadlist.h>
54 #include <sys/dsl_destroy.h>
55 #include <sys/dsl_userhold.h>
56 #include <sys/dsl_bookmark.h>
57 #include <sys/dmu_send.h>
58 #include <sys/zio_checksum.h>
59 #include <sys/zio_compress.h>
60 #include <zfs_fletcher.h>
61
62 SYSCTL_DECL(_vfs_zfs);
63
64 /*
65 * The SPA supports block sizes up to 16MB. However, very large blocks
66 * can have an impact on i/o latency (e.g. tying up a spinning disk for
67 * ~300ms), and also potentially on the memory allocator. Therefore,
68 * we do not allow the recordsize to be set larger than zfs_max_recordsize
69 * (default 1MB). Larger blocks can be created by changing this tunable,
70 * and pools with larger blocks can always be imported and used, regardless
71 * of this setting.
72 */
73 int zfs_max_recordsize = 1 * 1024 * 1024;
74 SYSCTL_INT(_vfs_zfs, OID_AUTO, max_recordsize, CTLFLAG_RWTUN,
75 &zfs_max_recordsize, 0,
76 "Maximum block size. Expect dragons when tuning this.");
77
78 #define SWITCH64(x, y) \
79 { \
80 uint64_t __tmp = (x); \
81 (x) = (y); \
82 (y) = __tmp; \
83 }
84
85 #define DS_REF_MAX (1ULL << 62)
86
87 extern inline dsl_dataset_phys_t *dsl_dataset_phys(dsl_dataset_t *ds);
88
89 extern int spa_asize_inflation;
90
91 static zil_header_t zero_zil;
92
93 /*
94 * Figure out how much of this delta should be propogated to the dsl_dir
95 * layer. If there's a refreservation, that space has already been
96 * partially accounted for in our ancestors.
97 */
98 static int64_t
parent_delta(dsl_dataset_t * ds,int64_t delta)99 parent_delta(dsl_dataset_t *ds, int64_t delta)
100 {
101 dsl_dataset_phys_t *ds_phys;
102 uint64_t old_bytes, new_bytes;
103
104 if (ds->ds_reserved == 0)
105 return (delta);
106
107 ds_phys = dsl_dataset_phys(ds);
108 old_bytes = MAX(ds_phys->ds_unique_bytes, ds->ds_reserved);
109 new_bytes = MAX(ds_phys->ds_unique_bytes + delta, ds->ds_reserved);
110
111 ASSERT3U(ABS((int64_t)(new_bytes - old_bytes)), <=, ABS(delta));
112 return (new_bytes - old_bytes);
113 }
114
115 void
dsl_dataset_block_born(dsl_dataset_t * ds,const blkptr_t * bp,dmu_tx_t * tx)116 dsl_dataset_block_born(dsl_dataset_t *ds, const blkptr_t *bp, dmu_tx_t *tx)
117 {
118 int used = bp_get_dsize_sync(tx->tx_pool->dp_spa, bp);
119 int compressed = BP_GET_PSIZE(bp);
120 int uncompressed = BP_GET_UCSIZE(bp);
121 int64_t delta;
122
123 dprintf_bp(bp, "ds=%p", ds);
124
125 ASSERT(dmu_tx_is_syncing(tx));
126 /* It could have been compressed away to nothing */
127 if (BP_IS_HOLE(bp))
128 return;
129 ASSERT(BP_GET_TYPE(bp) != DMU_OT_NONE);
130 ASSERT(DMU_OT_IS_VALID(BP_GET_TYPE(bp)));
131 if (ds == NULL) {
132 dsl_pool_mos_diduse_space(tx->tx_pool,
133 used, compressed, uncompressed);
134 return;
135 }
136
137 ASSERT3U(bp->blk_birth, >, dsl_dataset_phys(ds)->ds_prev_snap_txg);
138 dmu_buf_will_dirty(ds->ds_dbuf, tx);
139 mutex_enter(&ds->ds_lock);
140 delta = parent_delta(ds, used);
141 dsl_dataset_phys(ds)->ds_referenced_bytes += used;
142 dsl_dataset_phys(ds)->ds_compressed_bytes += compressed;
143 dsl_dataset_phys(ds)->ds_uncompressed_bytes += uncompressed;
144 dsl_dataset_phys(ds)->ds_unique_bytes += used;
145
146 if (BP_GET_LSIZE(bp) > SPA_OLD_MAXBLOCKSIZE) {
147 ds->ds_feature_activation_needed[SPA_FEATURE_LARGE_BLOCKS] =
148 B_TRUE;
149 }
150
151 spa_feature_t f = zio_checksum_to_feature(BP_GET_CHECKSUM(bp));
152 if (f != SPA_FEATURE_NONE)
153 ds->ds_feature_activation_needed[f] = B_TRUE;
154
155 mutex_exit(&ds->ds_lock);
156 dsl_dir_diduse_space(ds->ds_dir, DD_USED_HEAD, delta,
157 compressed, uncompressed, tx);
158 dsl_dir_transfer_space(ds->ds_dir, used - delta,
159 DD_USED_REFRSRV, DD_USED_HEAD, NULL);
160 }
161
162 int
dsl_dataset_block_kill(dsl_dataset_t * ds,const blkptr_t * bp,dmu_tx_t * tx,boolean_t async)163 dsl_dataset_block_kill(dsl_dataset_t *ds, const blkptr_t *bp, dmu_tx_t *tx,
164 boolean_t async)
165 {
166 int used = bp_get_dsize_sync(tx->tx_pool->dp_spa, bp);
167 int compressed = BP_GET_PSIZE(bp);
168 int uncompressed = BP_GET_UCSIZE(bp);
169
170 if (BP_IS_HOLE(bp))
171 return (0);
172
173 ASSERT(dmu_tx_is_syncing(tx));
174 ASSERT(bp->blk_birth <= tx->tx_txg);
175
176 if (ds == NULL) {
177 dsl_free(tx->tx_pool, tx->tx_txg, bp);
178 dsl_pool_mos_diduse_space(tx->tx_pool,
179 -used, -compressed, -uncompressed);
180 return (used);
181 }
182 ASSERT3P(tx->tx_pool, ==, ds->ds_dir->dd_pool);
183
184 ASSERT(!ds->ds_is_snapshot);
185 dmu_buf_will_dirty(ds->ds_dbuf, tx);
186
187 if (bp->blk_birth > dsl_dataset_phys(ds)->ds_prev_snap_txg) {
188 int64_t delta;
189
190 dprintf_bp(bp, "freeing ds=%llu", ds->ds_object);
191 dsl_free(tx->tx_pool, tx->tx_txg, bp);
192
193 mutex_enter(&ds->ds_lock);
194 ASSERT(dsl_dataset_phys(ds)->ds_unique_bytes >= used ||
195 !DS_UNIQUE_IS_ACCURATE(ds));
196 delta = parent_delta(ds, -used);
197 dsl_dataset_phys(ds)->ds_unique_bytes -= used;
198 mutex_exit(&ds->ds_lock);
199 dsl_dir_diduse_space(ds->ds_dir, DD_USED_HEAD,
200 delta, -compressed, -uncompressed, tx);
201 dsl_dir_transfer_space(ds->ds_dir, -used - delta,
202 DD_USED_REFRSRV, DD_USED_HEAD, NULL);
203 } else {
204 dprintf_bp(bp, "putting on dead list: %s", "");
205 if (async) {
206 /*
207 * We are here as part of zio's write done callback,
208 * which means we're a zio interrupt thread. We can't
209 * call dsl_deadlist_insert() now because it may block
210 * waiting for I/O. Instead, put bp on the deferred
211 * queue and let dsl_pool_sync() finish the job.
212 */
213 bplist_append(&ds->ds_pending_deadlist, bp);
214 } else {
215 dsl_deadlist_insert(&ds->ds_deadlist, bp, tx);
216 }
217 ASSERT3U(ds->ds_prev->ds_object, ==,
218 dsl_dataset_phys(ds)->ds_prev_snap_obj);
219 ASSERT(dsl_dataset_phys(ds->ds_prev)->ds_num_children > 0);
220 /* if (bp->blk_birth > prev prev snap txg) prev unique += bs */
221 if (dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj ==
222 ds->ds_object && bp->blk_birth >
223 dsl_dataset_phys(ds->ds_prev)->ds_prev_snap_txg) {
224 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx);
225 mutex_enter(&ds->ds_prev->ds_lock);
226 dsl_dataset_phys(ds->ds_prev)->ds_unique_bytes += used;
227 mutex_exit(&ds->ds_prev->ds_lock);
228 }
229 if (bp->blk_birth > ds->ds_dir->dd_origin_txg) {
230 dsl_dir_transfer_space(ds->ds_dir, used,
231 DD_USED_HEAD, DD_USED_SNAP, tx);
232 }
233 }
234 mutex_enter(&ds->ds_lock);
235 ASSERT3U(dsl_dataset_phys(ds)->ds_referenced_bytes, >=, used);
236 dsl_dataset_phys(ds)->ds_referenced_bytes -= used;
237 ASSERT3U(dsl_dataset_phys(ds)->ds_compressed_bytes, >=, compressed);
238 dsl_dataset_phys(ds)->ds_compressed_bytes -= compressed;
239 ASSERT3U(dsl_dataset_phys(ds)->ds_uncompressed_bytes, >=, uncompressed);
240 dsl_dataset_phys(ds)->ds_uncompressed_bytes -= uncompressed;
241 mutex_exit(&ds->ds_lock);
242
243 return (used);
244 }
245
246 uint64_t
dsl_dataset_prev_snap_txg(dsl_dataset_t * ds)247 dsl_dataset_prev_snap_txg(dsl_dataset_t *ds)
248 {
249 uint64_t trysnap = 0;
250
251 if (ds == NULL)
252 return (0);
253 /*
254 * The snapshot creation could fail, but that would cause an
255 * incorrect FALSE return, which would only result in an
256 * overestimation of the amount of space that an operation would
257 * consume, which is OK.
258 *
259 * There's also a small window where we could miss a pending
260 * snapshot, because we could set the sync task in the quiescing
261 * phase. So this should only be used as a guess.
262 */
263 if (ds->ds_trysnap_txg >
264 spa_last_synced_txg(ds->ds_dir->dd_pool->dp_spa))
265 trysnap = ds->ds_trysnap_txg;
266 return (MAX(dsl_dataset_phys(ds)->ds_prev_snap_txg, trysnap));
267 }
268
269 boolean_t
dsl_dataset_block_freeable(dsl_dataset_t * ds,const blkptr_t * bp,uint64_t blk_birth)270 dsl_dataset_block_freeable(dsl_dataset_t *ds, const blkptr_t *bp,
271 uint64_t blk_birth)
272 {
273 if (blk_birth <= dsl_dataset_prev_snap_txg(ds) ||
274 (bp != NULL && BP_IS_HOLE(bp)))
275 return (B_FALSE);
276
277 ddt_prefetch(dsl_dataset_get_spa(ds), bp);
278
279 return (B_TRUE);
280 }
281
282 /*
283 * We have to release the fsid syncronously or we risk that a subsequent
284 * mount of the same dataset will fail to unique_insert the fsid. This
285 * failure would manifest itself as the fsid of this dataset changing
286 * between mounts which makes NFS clients quite unhappy.
287 */
288 static void
dsl_dataset_evict_sync(void * dbu)289 dsl_dataset_evict_sync(void *dbu)
290 {
291 dsl_dataset_t *ds = dbu;
292
293 ASSERT(ds->ds_owner == NULL);
294
295 unique_remove(ds->ds_fsid_guid);
296 }
297
298 static void
dsl_dataset_evict_async(void * dbu)299 dsl_dataset_evict_async(void *dbu)
300 {
301 dsl_dataset_t *ds = dbu;
302
303 ASSERT(ds->ds_owner == NULL);
304
305 ds->ds_dbuf = NULL;
306
307 if (ds->ds_objset != NULL)
308 dmu_objset_evict(ds->ds_objset);
309
310 if (ds->ds_prev) {
311 dsl_dataset_rele(ds->ds_prev, ds);
312 ds->ds_prev = NULL;
313 }
314
315 bplist_destroy(&ds->ds_pending_deadlist);
316 if (ds->ds_deadlist.dl_os != NULL)
317 dsl_deadlist_close(&ds->ds_deadlist);
318 if (ds->ds_dir)
319 dsl_dir_async_rele(ds->ds_dir, ds);
320
321 ASSERT(!list_link_active(&ds->ds_synced_link));
322
323 list_destroy(&ds->ds_prop_cbs);
324 if (mutex_owned(&ds->ds_lock))
325 mutex_exit(&ds->ds_lock);
326 mutex_destroy(&ds->ds_lock);
327 if (mutex_owned(&ds->ds_opening_lock))
328 mutex_exit(&ds->ds_opening_lock);
329 mutex_destroy(&ds->ds_opening_lock);
330 mutex_destroy(&ds->ds_sendstream_lock);
331 refcount_destroy(&ds->ds_longholds);
332 rrw_destroy(&ds->ds_bp_rwlock);
333
334 kmem_free(ds, sizeof (dsl_dataset_t));
335 }
336
337 int
dsl_dataset_get_snapname(dsl_dataset_t * ds)338 dsl_dataset_get_snapname(dsl_dataset_t *ds)
339 {
340 dsl_dataset_phys_t *headphys;
341 int err;
342 dmu_buf_t *headdbuf;
343 dsl_pool_t *dp = ds->ds_dir->dd_pool;
344 objset_t *mos = dp->dp_meta_objset;
345
346 if (ds->ds_snapname[0])
347 return (0);
348 if (dsl_dataset_phys(ds)->ds_next_snap_obj == 0)
349 return (0);
350
351 err = dmu_bonus_hold(mos, dsl_dir_phys(ds->ds_dir)->dd_head_dataset_obj,
352 FTAG, &headdbuf);
353 if (err != 0)
354 return (err);
355 headphys = headdbuf->db_data;
356 err = zap_value_search(dp->dp_meta_objset,
357 headphys->ds_snapnames_zapobj, ds->ds_object, 0, ds->ds_snapname);
358 dmu_buf_rele(headdbuf, FTAG);
359 return (err);
360 }
361
362 int
dsl_dataset_snap_lookup(dsl_dataset_t * ds,const char * name,uint64_t * value)363 dsl_dataset_snap_lookup(dsl_dataset_t *ds, const char *name, uint64_t *value)
364 {
365 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
366 uint64_t snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj;
367 matchtype_t mt;
368 int err;
369
370 if (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_CI_DATASET)
371 mt = MT_FIRST;
372 else
373 mt = MT_EXACT;
374
375 err = zap_lookup_norm(mos, snapobj, name, 8, 1,
376 value, mt, NULL, 0, NULL);
377 if (err == ENOTSUP && mt == MT_FIRST)
378 err = zap_lookup(mos, snapobj, name, 8, 1, value);
379 return (err);
380 }
381
382 int
dsl_dataset_snap_remove(dsl_dataset_t * ds,const char * name,dmu_tx_t * tx,boolean_t adj_cnt)383 dsl_dataset_snap_remove(dsl_dataset_t *ds, const char *name, dmu_tx_t *tx,
384 boolean_t adj_cnt)
385 {
386 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
387 uint64_t snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj;
388 matchtype_t mt;
389 int err;
390
391 dsl_dir_snap_cmtime_update(ds->ds_dir);
392
393 if (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_CI_DATASET)
394 mt = MT_FIRST;
395 else
396 mt = MT_EXACT;
397
398 err = zap_remove_norm(mos, snapobj, name, mt, tx);
399 if (err == ENOTSUP && mt == MT_FIRST)
400 err = zap_remove(mos, snapobj, name, tx);
401
402 if (err == 0 && adj_cnt)
403 dsl_fs_ss_count_adjust(ds->ds_dir, -1,
404 DD_FIELD_SNAPSHOT_COUNT, tx);
405
406 return (err);
407 }
408
409 boolean_t
dsl_dataset_try_add_ref(dsl_pool_t * dp,dsl_dataset_t * ds,void * tag)410 dsl_dataset_try_add_ref(dsl_pool_t *dp, dsl_dataset_t *ds, void *tag)
411 {
412 dmu_buf_t *dbuf = ds->ds_dbuf;
413 boolean_t result = B_FALSE;
414
415 if (dbuf != NULL && dmu_buf_try_add_ref(dbuf, dp->dp_meta_objset,
416 ds->ds_object, DMU_BONUS_BLKID, tag)) {
417
418 if (ds == dmu_buf_get_user(dbuf))
419 result = B_TRUE;
420 else
421 dmu_buf_rele(dbuf, tag);
422 }
423
424 return (result);
425 }
426
427 int
dsl_dataset_hold_obj(dsl_pool_t * dp,uint64_t dsobj,void * tag,dsl_dataset_t ** dsp)428 dsl_dataset_hold_obj(dsl_pool_t *dp, uint64_t dsobj, void *tag,
429 dsl_dataset_t **dsp)
430 {
431 objset_t *mos = dp->dp_meta_objset;
432 dmu_buf_t *dbuf;
433 dsl_dataset_t *ds;
434 int err;
435 dmu_object_info_t doi;
436
437 ASSERT(dsl_pool_config_held(dp));
438
439 err = dmu_bonus_hold(mos, dsobj, tag, &dbuf);
440 if (err != 0)
441 return (err);
442
443 /* Make sure dsobj has the correct object type. */
444 dmu_object_info_from_db(dbuf, &doi);
445 if (doi.doi_bonus_type != DMU_OT_DSL_DATASET) {
446 dmu_buf_rele(dbuf, tag);
447 return (SET_ERROR(EINVAL));
448 }
449
450 ds = dmu_buf_get_user(dbuf);
451 if (ds == NULL) {
452 dsl_dataset_t *winner = NULL;
453
454 ds = kmem_zalloc(sizeof (dsl_dataset_t), KM_SLEEP);
455 ds->ds_dbuf = dbuf;
456 ds->ds_object = dsobj;
457 ds->ds_is_snapshot = dsl_dataset_phys(ds)->ds_num_children != 0;
458
459 mutex_init(&ds->ds_lock, NULL, MUTEX_DEFAULT, NULL);
460 mutex_init(&ds->ds_opening_lock, NULL, MUTEX_DEFAULT, NULL);
461 mutex_init(&ds->ds_sendstream_lock, NULL, MUTEX_DEFAULT, NULL);
462 rrw_init(&ds->ds_bp_rwlock, B_FALSE);
463 refcount_create(&ds->ds_longholds);
464
465 bplist_create(&ds->ds_pending_deadlist);
466 dsl_deadlist_open(&ds->ds_deadlist,
467 mos, dsl_dataset_phys(ds)->ds_deadlist_obj);
468
469 list_create(&ds->ds_sendstreams, sizeof (dmu_sendarg_t),
470 offsetof(dmu_sendarg_t, dsa_link));
471
472 list_create(&ds->ds_prop_cbs, sizeof (dsl_prop_cb_record_t),
473 offsetof(dsl_prop_cb_record_t, cbr_ds_node));
474
475 if (doi.doi_type == DMU_OTN_ZAP_METADATA) {
476 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) {
477 if (!(spa_feature_table[f].fi_flags &
478 ZFEATURE_FLAG_PER_DATASET))
479 continue;
480 err = zap_contains(mos, dsobj,
481 spa_feature_table[f].fi_guid);
482 if (err == 0) {
483 ds->ds_feature_inuse[f] = B_TRUE;
484 } else {
485 ASSERT3U(err, ==, ENOENT);
486 err = 0;
487 }
488 }
489 }
490
491 err = dsl_dir_hold_obj(dp,
492 dsl_dataset_phys(ds)->ds_dir_obj, NULL, ds, &ds->ds_dir);
493 if (err != 0) {
494 mutex_destroy(&ds->ds_lock);
495 mutex_destroy(&ds->ds_opening_lock);
496 mutex_destroy(&ds->ds_sendstream_lock);
497 refcount_destroy(&ds->ds_longholds);
498 bplist_destroy(&ds->ds_pending_deadlist);
499 dsl_deadlist_close(&ds->ds_deadlist);
500 kmem_free(ds, sizeof (dsl_dataset_t));
501 dmu_buf_rele(dbuf, tag);
502 return (err);
503 }
504
505 if (!ds->ds_is_snapshot) {
506 ds->ds_snapname[0] = '\0';
507 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) {
508 err = dsl_dataset_hold_obj(dp,
509 dsl_dataset_phys(ds)->ds_prev_snap_obj,
510 ds, &ds->ds_prev);
511 }
512 if (doi.doi_type == DMU_OTN_ZAP_METADATA) {
513 int zaperr = zap_lookup(mos, ds->ds_object,
514 DS_FIELD_BOOKMARK_NAMES,
515 sizeof (ds->ds_bookmarks), 1,
516 &ds->ds_bookmarks);
517 if (zaperr != ENOENT)
518 VERIFY0(zaperr);
519 }
520 } else {
521 if (zfs_flags & ZFS_DEBUG_SNAPNAMES)
522 err = dsl_dataset_get_snapname(ds);
523 if (err == 0 &&
524 dsl_dataset_phys(ds)->ds_userrefs_obj != 0) {
525 err = zap_count(
526 ds->ds_dir->dd_pool->dp_meta_objset,
527 dsl_dataset_phys(ds)->ds_userrefs_obj,
528 &ds->ds_userrefs);
529 }
530 }
531
532 if (err == 0 && !ds->ds_is_snapshot) {
533 err = dsl_prop_get_int_ds(ds,
534 zfs_prop_to_name(ZFS_PROP_REFRESERVATION),
535 &ds->ds_reserved);
536 if (err == 0) {
537 err = dsl_prop_get_int_ds(ds,
538 zfs_prop_to_name(ZFS_PROP_REFQUOTA),
539 &ds->ds_quota);
540 }
541 } else {
542 ds->ds_reserved = ds->ds_quota = 0;
543 }
544
545 dmu_buf_init_user(&ds->ds_dbu, dsl_dataset_evict_sync,
546 dsl_dataset_evict_async, &ds->ds_dbuf);
547 if (err == 0)
548 winner = dmu_buf_set_user_ie(dbuf, &ds->ds_dbu);
549
550 if (err != 0 || winner != NULL) {
551 bplist_destroy(&ds->ds_pending_deadlist);
552 dsl_deadlist_close(&ds->ds_deadlist);
553 if (ds->ds_prev)
554 dsl_dataset_rele(ds->ds_prev, ds);
555 dsl_dir_rele(ds->ds_dir, ds);
556 mutex_destroy(&ds->ds_lock);
557 mutex_destroy(&ds->ds_opening_lock);
558 mutex_destroy(&ds->ds_sendstream_lock);
559 refcount_destroy(&ds->ds_longholds);
560 kmem_free(ds, sizeof (dsl_dataset_t));
561 if (err != 0) {
562 dmu_buf_rele(dbuf, tag);
563 return (err);
564 }
565 ds = winner;
566 } else {
567 ds->ds_fsid_guid =
568 unique_insert(dsl_dataset_phys(ds)->ds_fsid_guid);
569 if (ds->ds_fsid_guid !=
570 dsl_dataset_phys(ds)->ds_fsid_guid) {
571 zfs_dbgmsg("ds_fsid_guid changed from "
572 "%llx to %llx for pool %s dataset id %llu",
573 (long long)
574 dsl_dataset_phys(ds)->ds_fsid_guid,
575 (long long)ds->ds_fsid_guid,
576 spa_name(dp->dp_spa),
577 dsobj);
578 }
579 }
580 }
581 ASSERT3P(ds->ds_dbuf, ==, dbuf);
582 ASSERT3P(dsl_dataset_phys(ds), ==, dbuf->db_data);
583 ASSERT(dsl_dataset_phys(ds)->ds_prev_snap_obj != 0 ||
584 spa_version(dp->dp_spa) < SPA_VERSION_ORIGIN ||
585 dp->dp_origin_snap == NULL || ds == dp->dp_origin_snap);
586 *dsp = ds;
587 return (0);
588 }
589
590 int
dsl_dataset_hold(dsl_pool_t * dp,const char * name,void * tag,dsl_dataset_t ** dsp)591 dsl_dataset_hold(dsl_pool_t *dp, const char *name,
592 void *tag, dsl_dataset_t **dsp)
593 {
594 dsl_dir_t *dd;
595 const char *snapname;
596 uint64_t obj;
597 int err = 0;
598 dsl_dataset_t *ds;
599
600 err = dsl_dir_hold(dp, name, FTAG, &dd, &snapname);
601 if (err != 0)
602 return (err);
603
604 ASSERT(dsl_pool_config_held(dp));
605 obj = dsl_dir_phys(dd)->dd_head_dataset_obj;
606 if (obj != 0)
607 err = dsl_dataset_hold_obj(dp, obj, tag, &ds);
608 else
609 err = SET_ERROR(ENOENT);
610
611 /* we may be looking for a snapshot */
612 if (err == 0 && snapname != NULL) {
613 dsl_dataset_t *snap_ds;
614
615 if (*snapname++ != '@') {
616 dsl_dataset_rele(ds, tag);
617 dsl_dir_rele(dd, FTAG);
618 return (SET_ERROR(ENOENT));
619 }
620
621 dprintf("looking for snapshot '%s'\n", snapname);
622 err = dsl_dataset_snap_lookup(ds, snapname, &obj);
623 if (err == 0)
624 err = dsl_dataset_hold_obj(dp, obj, tag, &snap_ds);
625 dsl_dataset_rele(ds, tag);
626
627 if (err == 0) {
628 mutex_enter(&snap_ds->ds_lock);
629 if (snap_ds->ds_snapname[0] == 0)
630 (void) strlcpy(snap_ds->ds_snapname, snapname,
631 sizeof (snap_ds->ds_snapname));
632 mutex_exit(&snap_ds->ds_lock);
633 ds = snap_ds;
634 }
635 }
636 if (err == 0)
637 *dsp = ds;
638 dsl_dir_rele(dd, FTAG);
639 return (err);
640 }
641
642 int
dsl_dataset_own_obj(dsl_pool_t * dp,uint64_t dsobj,void * tag,dsl_dataset_t ** dsp)643 dsl_dataset_own_obj(dsl_pool_t *dp, uint64_t dsobj,
644 void *tag, dsl_dataset_t **dsp)
645 {
646 int err = dsl_dataset_hold_obj(dp, dsobj, tag, dsp);
647 if (err != 0)
648 return (err);
649 if (!dsl_dataset_tryown(*dsp, tag)) {
650 dsl_dataset_rele(*dsp, tag);
651 *dsp = NULL;
652 return (SET_ERROR(EBUSY));
653 }
654 return (0);
655 }
656
657 int
dsl_dataset_own(dsl_pool_t * dp,const char * name,void * tag,dsl_dataset_t ** dsp)658 dsl_dataset_own(dsl_pool_t *dp, const char *name,
659 void *tag, dsl_dataset_t **dsp)
660 {
661 int err = dsl_dataset_hold(dp, name, tag, dsp);
662 if (err != 0)
663 return (err);
664 if (!dsl_dataset_tryown(*dsp, tag)) {
665 dsl_dataset_rele(*dsp, tag);
666 return (SET_ERROR(EBUSY));
667 }
668 return (0);
669 }
670
671 /*
672 * See the comment above dsl_pool_hold() for details. In summary, a long
673 * hold is used to prevent destruction of a dataset while the pool hold
674 * is dropped, allowing other concurrent operations (e.g. spa_sync()).
675 *
676 * The dataset and pool must be held when this function is called. After it
677 * is called, the pool hold may be released while the dataset is still held
678 * and accessed.
679 */
680 void
dsl_dataset_long_hold(dsl_dataset_t * ds,void * tag)681 dsl_dataset_long_hold(dsl_dataset_t *ds, void *tag)
682 {
683 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool));
684 (void) refcount_add(&ds->ds_longholds, tag);
685 }
686
687 void
dsl_dataset_long_rele(dsl_dataset_t * ds,void * tag)688 dsl_dataset_long_rele(dsl_dataset_t *ds, void *tag)
689 {
690 (void) refcount_remove(&ds->ds_longholds, tag);
691 }
692
693 /* Return B_TRUE if there are any long holds on this dataset. */
694 boolean_t
dsl_dataset_long_held(dsl_dataset_t * ds)695 dsl_dataset_long_held(dsl_dataset_t *ds)
696 {
697 return (!refcount_is_zero(&ds->ds_longholds));
698 }
699
700 void
dsl_dataset_name(dsl_dataset_t * ds,char * name)701 dsl_dataset_name(dsl_dataset_t *ds, char *name)
702 {
703 if (ds == NULL) {
704 (void) strcpy(name, "mos");
705 } else {
706 dsl_dir_name(ds->ds_dir, name);
707 VERIFY0(dsl_dataset_get_snapname(ds));
708 if (ds->ds_snapname[0]) {
709 VERIFY3U(strlcat(name, "@", ZFS_MAX_DATASET_NAME_LEN),
710 <, ZFS_MAX_DATASET_NAME_LEN);
711 /*
712 * We use a "recursive" mutex so that we
713 * can call dprintf_ds() with ds_lock held.
714 */
715 if (!MUTEX_HELD(&ds->ds_lock)) {
716 mutex_enter(&ds->ds_lock);
717 VERIFY3U(strlcat(name, ds->ds_snapname,
718 ZFS_MAX_DATASET_NAME_LEN), <,
719 ZFS_MAX_DATASET_NAME_LEN);
720 mutex_exit(&ds->ds_lock);
721 } else {
722 VERIFY3U(strlcat(name, ds->ds_snapname,
723 ZFS_MAX_DATASET_NAME_LEN), <,
724 ZFS_MAX_DATASET_NAME_LEN);
725 }
726 }
727 }
728 }
729
730 int
dsl_dataset_namelen(dsl_dataset_t * ds)731 dsl_dataset_namelen(dsl_dataset_t *ds)
732 {
733 VERIFY0(dsl_dataset_get_snapname(ds));
734 mutex_enter(&ds->ds_lock);
735 int len = dsl_dir_namelen(ds->ds_dir) + 1 + strlen(ds->ds_snapname);
736 mutex_exit(&ds->ds_lock);
737 return (len);
738 }
739
740 void
dsl_dataset_rele(dsl_dataset_t * ds,void * tag)741 dsl_dataset_rele(dsl_dataset_t *ds, void *tag)
742 {
743 dmu_buf_rele(ds->ds_dbuf, tag);
744 }
745
746 void
dsl_dataset_disown(dsl_dataset_t * ds,void * tag)747 dsl_dataset_disown(dsl_dataset_t *ds, void *tag)
748 {
749 ASSERT3P(ds->ds_owner, ==, tag);
750 ASSERT(ds->ds_dbuf != NULL);
751
752 mutex_enter(&ds->ds_lock);
753 ds->ds_owner = NULL;
754 mutex_exit(&ds->ds_lock);
755 dsl_dataset_long_rele(ds, tag);
756 dsl_dataset_rele(ds, tag);
757 }
758
759 boolean_t
dsl_dataset_tryown(dsl_dataset_t * ds,void * tag)760 dsl_dataset_tryown(dsl_dataset_t *ds, void *tag)
761 {
762 boolean_t gotit = FALSE;
763
764 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool));
765 mutex_enter(&ds->ds_lock);
766 if (ds->ds_owner == NULL && !DS_IS_INCONSISTENT(ds)) {
767 ds->ds_owner = tag;
768 dsl_dataset_long_hold(ds, tag);
769 gotit = TRUE;
770 }
771 mutex_exit(&ds->ds_lock);
772 return (gotit);
773 }
774
775 boolean_t
dsl_dataset_has_owner(dsl_dataset_t * ds)776 dsl_dataset_has_owner(dsl_dataset_t *ds)
777 {
778 boolean_t rv;
779 mutex_enter(&ds->ds_lock);
780 rv = (ds->ds_owner != NULL);
781 mutex_exit(&ds->ds_lock);
782 return (rv);
783 }
784
785 static void
dsl_dataset_activate_feature(uint64_t dsobj,spa_feature_t f,dmu_tx_t * tx)786 dsl_dataset_activate_feature(uint64_t dsobj, spa_feature_t f, dmu_tx_t *tx)
787 {
788 spa_t *spa = dmu_tx_pool(tx)->dp_spa;
789 objset_t *mos = dmu_tx_pool(tx)->dp_meta_objset;
790 uint64_t zero = 0;
791
792 VERIFY(spa_feature_table[f].fi_flags & ZFEATURE_FLAG_PER_DATASET);
793
794 spa_feature_incr(spa, f, tx);
795 dmu_object_zapify(mos, dsobj, DMU_OT_DSL_DATASET, tx);
796
797 VERIFY0(zap_add(mos, dsobj, spa_feature_table[f].fi_guid,
798 sizeof (zero), 1, &zero, tx));
799 }
800
801 void
dsl_dataset_deactivate_feature(uint64_t dsobj,spa_feature_t f,dmu_tx_t * tx)802 dsl_dataset_deactivate_feature(uint64_t dsobj, spa_feature_t f, dmu_tx_t *tx)
803 {
804 spa_t *spa = dmu_tx_pool(tx)->dp_spa;
805 objset_t *mos = dmu_tx_pool(tx)->dp_meta_objset;
806
807 VERIFY(spa_feature_table[f].fi_flags & ZFEATURE_FLAG_PER_DATASET);
808
809 VERIFY0(zap_remove(mos, dsobj, spa_feature_table[f].fi_guid, tx));
810 spa_feature_decr(spa, f, tx);
811 }
812
813 uint64_t
dsl_dataset_create_sync_dd(dsl_dir_t * dd,dsl_dataset_t * origin,uint64_t flags,dmu_tx_t * tx)814 dsl_dataset_create_sync_dd(dsl_dir_t *dd, dsl_dataset_t *origin,
815 uint64_t flags, dmu_tx_t *tx)
816 {
817 dsl_pool_t *dp = dd->dd_pool;
818 dmu_buf_t *dbuf;
819 dsl_dataset_phys_t *dsphys;
820 uint64_t dsobj;
821 objset_t *mos = dp->dp_meta_objset;
822
823 if (origin == NULL)
824 origin = dp->dp_origin_snap;
825
826 ASSERT(origin == NULL || origin->ds_dir->dd_pool == dp);
827 ASSERT(origin == NULL || dsl_dataset_phys(origin)->ds_num_children > 0);
828 ASSERT(dmu_tx_is_syncing(tx));
829 ASSERT(dsl_dir_phys(dd)->dd_head_dataset_obj == 0);
830
831 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0,
832 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx);
833 VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf));
834 dmu_buf_will_dirty(dbuf, tx);
835 dsphys = dbuf->db_data;
836 bzero(dsphys, sizeof (dsl_dataset_phys_t));
837 dsphys->ds_dir_obj = dd->dd_object;
838 dsphys->ds_flags = flags;
839 dsphys->ds_fsid_guid = unique_create();
840 do {
841 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid,
842 sizeof (dsphys->ds_guid));
843 } while (dsphys->ds_guid == 0);
844 dsphys->ds_snapnames_zapobj =
845 zap_create_norm(mos, U8_TEXTPREP_TOUPPER, DMU_OT_DSL_DS_SNAP_MAP,
846 DMU_OT_NONE, 0, tx);
847 dsphys->ds_creation_time = gethrestime_sec();
848 dsphys->ds_creation_txg = tx->tx_txg == TXG_INITIAL ? 1 : tx->tx_txg;
849
850 if (origin == NULL) {
851 dsphys->ds_deadlist_obj = dsl_deadlist_alloc(mos, tx);
852 } else {
853 dsl_dataset_t *ohds; /* head of the origin snapshot */
854
855 dsphys->ds_prev_snap_obj = origin->ds_object;
856 dsphys->ds_prev_snap_txg =
857 dsl_dataset_phys(origin)->ds_creation_txg;
858 dsphys->ds_referenced_bytes =
859 dsl_dataset_phys(origin)->ds_referenced_bytes;
860 dsphys->ds_compressed_bytes =
861 dsl_dataset_phys(origin)->ds_compressed_bytes;
862 dsphys->ds_uncompressed_bytes =
863 dsl_dataset_phys(origin)->ds_uncompressed_bytes;
864 rrw_enter(&origin->ds_bp_rwlock, RW_READER, FTAG);
865 dsphys->ds_bp = dsl_dataset_phys(origin)->ds_bp;
866 rrw_exit(&origin->ds_bp_rwlock, FTAG);
867
868 /*
869 * Inherit flags that describe the dataset's contents
870 * (INCONSISTENT) or properties (Case Insensitive).
871 */
872 dsphys->ds_flags |= dsl_dataset_phys(origin)->ds_flags &
873 (DS_FLAG_INCONSISTENT | DS_FLAG_CI_DATASET);
874
875 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) {
876 if (origin->ds_feature_inuse[f])
877 dsl_dataset_activate_feature(dsobj, f, tx);
878 }
879
880 dmu_buf_will_dirty(origin->ds_dbuf, tx);
881 dsl_dataset_phys(origin)->ds_num_children++;
882
883 VERIFY0(dsl_dataset_hold_obj(dp,
884 dsl_dir_phys(origin->ds_dir)->dd_head_dataset_obj,
885 FTAG, &ohds));
886 dsphys->ds_deadlist_obj = dsl_deadlist_clone(&ohds->ds_deadlist,
887 dsphys->ds_prev_snap_txg, dsphys->ds_prev_snap_obj, tx);
888 dsl_dataset_rele(ohds, FTAG);
889
890 if (spa_version(dp->dp_spa) >= SPA_VERSION_NEXT_CLONES) {
891 if (dsl_dataset_phys(origin)->ds_next_clones_obj == 0) {
892 dsl_dataset_phys(origin)->ds_next_clones_obj =
893 zap_create(mos,
894 DMU_OT_NEXT_CLONES, DMU_OT_NONE, 0, tx);
895 }
896 VERIFY0(zap_add_int(mos,
897 dsl_dataset_phys(origin)->ds_next_clones_obj,
898 dsobj, tx));
899 }
900
901 dmu_buf_will_dirty(dd->dd_dbuf, tx);
902 dsl_dir_phys(dd)->dd_origin_obj = origin->ds_object;
903 if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) {
904 if (dsl_dir_phys(origin->ds_dir)->dd_clones == 0) {
905 dmu_buf_will_dirty(origin->ds_dir->dd_dbuf, tx);
906 dsl_dir_phys(origin->ds_dir)->dd_clones =
907 zap_create(mos,
908 DMU_OT_DSL_CLONES, DMU_OT_NONE, 0, tx);
909 }
910 VERIFY0(zap_add_int(mos,
911 dsl_dir_phys(origin->ds_dir)->dd_clones,
912 dsobj, tx));
913 }
914 }
915
916 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE)
917 dsphys->ds_flags |= DS_FLAG_UNIQUE_ACCURATE;
918
919 dmu_buf_rele(dbuf, FTAG);
920
921 dmu_buf_will_dirty(dd->dd_dbuf, tx);
922 dsl_dir_phys(dd)->dd_head_dataset_obj = dsobj;
923
924 return (dsobj);
925 }
926
927 static void
dsl_dataset_zero_zil(dsl_dataset_t * ds,dmu_tx_t * tx)928 dsl_dataset_zero_zil(dsl_dataset_t *ds, dmu_tx_t *tx)
929 {
930 objset_t *os;
931
932 VERIFY0(dmu_objset_from_ds(ds, &os));
933 if (bcmp(&os->os_zil_header, &zero_zil, sizeof (zero_zil)) != 0) {
934 dsl_pool_t *dp = ds->ds_dir->dd_pool;
935 zio_t *zio;
936
937 bzero(&os->os_zil_header, sizeof (os->os_zil_header));
938
939 zio = zio_root(dp->dp_spa, NULL, NULL, ZIO_FLAG_MUSTSUCCEED);
940 dsl_dataset_sync(ds, zio, tx);
941 VERIFY0(zio_wait(zio));
942
943 /* dsl_dataset_sync_done will drop this reference. */
944 dmu_buf_add_ref(ds->ds_dbuf, ds);
945 dsl_dataset_sync_done(ds, tx);
946 }
947 }
948
949 uint64_t
dsl_dataset_create_sync(dsl_dir_t * pdd,const char * lastname,dsl_dataset_t * origin,uint64_t flags,cred_t * cr,dmu_tx_t * tx)950 dsl_dataset_create_sync(dsl_dir_t *pdd, const char *lastname,
951 dsl_dataset_t *origin, uint64_t flags, cred_t *cr, dmu_tx_t *tx)
952 {
953 dsl_pool_t *dp = pdd->dd_pool;
954 uint64_t dsobj, ddobj;
955 dsl_dir_t *dd;
956
957 ASSERT(dmu_tx_is_syncing(tx));
958 ASSERT(lastname[0] != '@');
959
960 ddobj = dsl_dir_create_sync(dp, pdd, lastname, tx);
961 VERIFY0(dsl_dir_hold_obj(dp, ddobj, lastname, FTAG, &dd));
962
963 dsobj = dsl_dataset_create_sync_dd(dd, origin,
964 flags & ~DS_CREATE_FLAG_NODIRTY, tx);
965
966 dsl_deleg_set_create_perms(dd, tx, cr);
967
968 /*
969 * Since we're creating a new node we know it's a leaf, so we can
970 * initialize the counts if the limit feature is active.
971 */
972 if (spa_feature_is_active(dp->dp_spa, SPA_FEATURE_FS_SS_LIMIT)) {
973 uint64_t cnt = 0;
974 objset_t *os = dd->dd_pool->dp_meta_objset;
975
976 dsl_dir_zapify(dd, tx);
977 VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_FILESYSTEM_COUNT,
978 sizeof (cnt), 1, &cnt, tx));
979 VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_SNAPSHOT_COUNT,
980 sizeof (cnt), 1, &cnt, tx));
981 }
982
983 dsl_dir_rele(dd, FTAG);
984
985 /*
986 * If we are creating a clone, make sure we zero out any stale
987 * data from the origin snapshots zil header.
988 */
989 if (origin != NULL && !(flags & DS_CREATE_FLAG_NODIRTY)) {
990 dsl_dataset_t *ds;
991
992 VERIFY0(dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds));
993 dsl_dataset_zero_zil(ds, tx);
994 dsl_dataset_rele(ds, FTAG);
995 }
996
997 return (dsobj);
998 }
999
1000 #if defined(__FreeBSD__) || defined(__NetBSD__)
1001 /* FreeBSD ioctl compat begin */
1002 struct destroyarg {
1003 nvlist_t *nvl;
1004 const char *snapname;
1005 };
1006
1007 static int
dsl_check_snap_cb(const char * name,void * arg)1008 dsl_check_snap_cb(const char *name, void *arg)
1009 {
1010 struct destroyarg *da = arg;
1011 dsl_dataset_t *ds;
1012 char *dsname;
1013
1014 dsname = kmem_asprintf("%s@%s", name, da->snapname);
1015 fnvlist_add_boolean(da->nvl, dsname);
1016 kmem_free(dsname, strlen(dsname) + 1);
1017
1018 return (0);
1019 }
1020
1021 int
dmu_get_recursive_snaps_nvl(char * fsname,const char * snapname,nvlist_t * snaps)1022 dmu_get_recursive_snaps_nvl(char *fsname, const char *snapname,
1023 nvlist_t *snaps)
1024 {
1025 struct destroyarg *da;
1026 int err;
1027
1028 da = kmem_zalloc(sizeof (struct destroyarg), KM_SLEEP);
1029 da->nvl = snaps;
1030 da->snapname = snapname;
1031 err = dmu_objset_find(fsname, dsl_check_snap_cb, da,
1032 DS_FIND_CHILDREN);
1033 kmem_free(da, sizeof (struct destroyarg));
1034
1035 return (err);
1036 }
1037 /* FreeBSD ioctl compat end */
1038 #endif /* defined(__FreeBSD__) || defined(__NetBSD__) */
1039
1040 /*
1041 * The unique space in the head dataset can be calculated by subtracting
1042 * the space used in the most recent snapshot, that is still being used
1043 * in this file system, from the space currently in use. To figure out
1044 * the space in the most recent snapshot still in use, we need to take
1045 * the total space used in the snapshot and subtract out the space that
1046 * has been freed up since the snapshot was taken.
1047 */
1048 void
dsl_dataset_recalc_head_uniq(dsl_dataset_t * ds)1049 dsl_dataset_recalc_head_uniq(dsl_dataset_t *ds)
1050 {
1051 uint64_t mrs_used;
1052 uint64_t dlused, dlcomp, dluncomp;
1053
1054 ASSERT(!ds->ds_is_snapshot);
1055
1056 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0)
1057 mrs_used = dsl_dataset_phys(ds->ds_prev)->ds_referenced_bytes;
1058 else
1059 mrs_used = 0;
1060
1061 dsl_deadlist_space(&ds->ds_deadlist, &dlused, &dlcomp, &dluncomp);
1062
1063 ASSERT3U(dlused, <=, mrs_used);
1064 dsl_dataset_phys(ds)->ds_unique_bytes =
1065 dsl_dataset_phys(ds)->ds_referenced_bytes - (mrs_used - dlused);
1066
1067 if (spa_version(ds->ds_dir->dd_pool->dp_spa) >=
1068 SPA_VERSION_UNIQUE_ACCURATE)
1069 dsl_dataset_phys(ds)->ds_flags |= DS_FLAG_UNIQUE_ACCURATE;
1070 }
1071
1072 void
dsl_dataset_remove_from_next_clones(dsl_dataset_t * ds,uint64_t obj,dmu_tx_t * tx)1073 dsl_dataset_remove_from_next_clones(dsl_dataset_t *ds, uint64_t obj,
1074 dmu_tx_t *tx)
1075 {
1076 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
1077 uint64_t count;
1078 int err;
1079
1080 ASSERT(dsl_dataset_phys(ds)->ds_num_children >= 2);
1081 err = zap_remove_int(mos, dsl_dataset_phys(ds)->ds_next_clones_obj,
1082 obj, tx);
1083 /*
1084 * The err should not be ENOENT, but a bug in a previous version
1085 * of the code could cause upgrade_clones_cb() to not set
1086 * ds_next_snap_obj when it should, leading to a missing entry.
1087 * If we knew that the pool was created after
1088 * SPA_VERSION_NEXT_CLONES, we could assert that it isn't
1089 * ENOENT. However, at least we can check that we don't have
1090 * too many entries in the next_clones_obj even after failing to
1091 * remove this one.
1092 */
1093 if (err != ENOENT)
1094 VERIFY0(err);
1095 ASSERT0(zap_count(mos, dsl_dataset_phys(ds)->ds_next_clones_obj,
1096 &count));
1097 ASSERT3U(count, <=, dsl_dataset_phys(ds)->ds_num_children - 2);
1098 }
1099
1100
1101 blkptr_t *
dsl_dataset_get_blkptr(dsl_dataset_t * ds)1102 dsl_dataset_get_blkptr(dsl_dataset_t *ds)
1103 {
1104 return (&dsl_dataset_phys(ds)->ds_bp);
1105 }
1106
1107 spa_t *
dsl_dataset_get_spa(dsl_dataset_t * ds)1108 dsl_dataset_get_spa(dsl_dataset_t *ds)
1109 {
1110 return (ds->ds_dir->dd_pool->dp_spa);
1111 }
1112
1113 void
dsl_dataset_dirty(dsl_dataset_t * ds,dmu_tx_t * tx)1114 dsl_dataset_dirty(dsl_dataset_t *ds, dmu_tx_t *tx)
1115 {
1116 dsl_pool_t *dp;
1117
1118 if (ds == NULL) /* this is the meta-objset */
1119 return;
1120
1121 ASSERT(ds->ds_objset != NULL);
1122
1123 if (dsl_dataset_phys(ds)->ds_next_snap_obj != 0)
1124 panic("dirtying snapshot!");
1125
1126 /* Must not dirty a dataset in the same txg where it got snapshotted. */
1127 ASSERT3U(tx->tx_txg, >, dsl_dataset_phys(ds)->ds_prev_snap_txg);
1128
1129 dp = ds->ds_dir->dd_pool;
1130 if (txg_list_add(&dp->dp_dirty_datasets, ds, tx->tx_txg)) {
1131 /* up the hold count until we can be written out */
1132 dmu_buf_add_ref(ds->ds_dbuf, ds);
1133 }
1134 }
1135
1136 boolean_t
dsl_dataset_is_dirty(dsl_dataset_t * ds)1137 dsl_dataset_is_dirty(dsl_dataset_t *ds)
1138 {
1139 for (int t = 0; t < TXG_SIZE; t++) {
1140 if (txg_list_member(&ds->ds_dir->dd_pool->dp_dirty_datasets,
1141 ds, t))
1142 return (B_TRUE);
1143 }
1144 return (B_FALSE);
1145 }
1146
1147 static int
dsl_dataset_snapshot_reserve_space(dsl_dataset_t * ds,dmu_tx_t * tx)1148 dsl_dataset_snapshot_reserve_space(dsl_dataset_t *ds, dmu_tx_t *tx)
1149 {
1150 uint64_t asize;
1151
1152 if (!dmu_tx_is_syncing(tx))
1153 return (0);
1154
1155 /*
1156 * If there's an fs-only reservation, any blocks that might become
1157 * owned by the snapshot dataset must be accommodated by space
1158 * outside of the reservation.
1159 */
1160 ASSERT(ds->ds_reserved == 0 || DS_UNIQUE_IS_ACCURATE(ds));
1161 asize = MIN(dsl_dataset_phys(ds)->ds_unique_bytes, ds->ds_reserved);
1162 if (asize > dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE))
1163 return (SET_ERROR(ENOSPC));
1164
1165 /*
1166 * Propagate any reserved space for this snapshot to other
1167 * snapshot checks in this sync group.
1168 */
1169 if (asize > 0)
1170 dsl_dir_willuse_space(ds->ds_dir, asize, tx);
1171
1172 return (0);
1173 }
1174
1175 typedef struct dsl_dataset_snapshot_arg {
1176 nvlist_t *ddsa_snaps;
1177 nvlist_t *ddsa_props;
1178 nvlist_t *ddsa_errors;
1179 cred_t *ddsa_cr;
1180 } dsl_dataset_snapshot_arg_t;
1181
1182 int
dsl_dataset_snapshot_check_impl(dsl_dataset_t * ds,const char * snapname,dmu_tx_t * tx,boolean_t recv,uint64_t cnt,cred_t * cr)1183 dsl_dataset_snapshot_check_impl(dsl_dataset_t *ds, const char *snapname,
1184 dmu_tx_t *tx, boolean_t recv, uint64_t cnt, cred_t *cr)
1185 {
1186 int error;
1187 uint64_t value;
1188
1189 ds->ds_trysnap_txg = tx->tx_txg;
1190
1191 if (!dmu_tx_is_syncing(tx))
1192 return (0);
1193
1194 /*
1195 * We don't allow multiple snapshots of the same txg. If there
1196 * is already one, try again.
1197 */
1198 if (dsl_dataset_phys(ds)->ds_prev_snap_txg >= tx->tx_txg)
1199 return (SET_ERROR(EAGAIN));
1200
1201 /*
1202 * Check for conflicting snapshot name.
1203 */
1204 error = dsl_dataset_snap_lookup(ds, snapname, &value);
1205 if (error == 0)
1206 return (SET_ERROR(EEXIST));
1207 if (error != ENOENT)
1208 return (error);
1209
1210 /*
1211 * We don't allow taking snapshots of inconsistent datasets, such as
1212 * those into which we are currently receiving. However, if we are
1213 * creating this snapshot as part of a receive, this check will be
1214 * executed atomically with respect to the completion of the receive
1215 * itself but prior to the clearing of DS_FLAG_INCONSISTENT; in this
1216 * case we ignore this, knowing it will be fixed up for us shortly in
1217 * dmu_recv_end_sync().
1218 */
1219 if (!recv && DS_IS_INCONSISTENT(ds))
1220 return (SET_ERROR(EBUSY));
1221
1222 /*
1223 * Skip the check for temporary snapshots or if we have already checked
1224 * the counts in dsl_dataset_snapshot_check. This means we really only
1225 * check the count here when we're receiving a stream.
1226 */
1227 if (cnt != 0 && cr != NULL) {
1228 error = dsl_fs_ss_limit_check(ds->ds_dir, cnt,
1229 ZFS_PROP_SNAPSHOT_LIMIT, NULL, cr);
1230 if (error != 0)
1231 return (error);
1232 }
1233
1234 error = dsl_dataset_snapshot_reserve_space(ds, tx);
1235 if (error != 0)
1236 return (error);
1237
1238 return (0);
1239 }
1240
1241 static int
dsl_dataset_snapshot_check(void * arg,dmu_tx_t * tx)1242 dsl_dataset_snapshot_check(void *arg, dmu_tx_t *tx)
1243 {
1244 dsl_dataset_snapshot_arg_t *ddsa = arg;
1245 dsl_pool_t *dp = dmu_tx_pool(tx);
1246 nvpair_t *pair;
1247 int rv = 0;
1248
1249 /*
1250 * Pre-compute how many total new snapshots will be created for each
1251 * level in the tree and below. This is needed for validating the
1252 * snapshot limit when either taking a recursive snapshot or when
1253 * taking multiple snapshots.
1254 *
1255 * The problem is that the counts are not actually adjusted when
1256 * we are checking, only when we finally sync. For a single snapshot,
1257 * this is easy, the count will increase by 1 at each node up the tree,
1258 * but its more complicated for the recursive/multiple snapshot case.
1259 *
1260 * The dsl_fs_ss_limit_check function does recursively check the count
1261 * at each level up the tree but since it is validating each snapshot
1262 * independently we need to be sure that we are validating the complete
1263 * count for the entire set of snapshots. We do this by rolling up the
1264 * counts for each component of the name into an nvlist and then
1265 * checking each of those cases with the aggregated count.
1266 *
1267 * This approach properly handles not only the recursive snapshot
1268 * case (where we get all of those on the ddsa_snaps list) but also
1269 * the sibling case (e.g. snapshot a/b and a/c so that we will also
1270 * validate the limit on 'a' using a count of 2).
1271 *
1272 * We validate the snapshot names in the third loop and only report
1273 * name errors once.
1274 */
1275 if (dmu_tx_is_syncing(tx)) {
1276 nvlist_t *cnt_track = NULL;
1277 cnt_track = fnvlist_alloc();
1278
1279 /* Rollup aggregated counts into the cnt_track list */
1280 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL);
1281 pair != NULL;
1282 pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) {
1283 char *pdelim;
1284 uint64_t val;
1285 char nm[MAXPATHLEN];
1286
1287 (void) strlcpy(nm, nvpair_name(pair), sizeof (nm));
1288 pdelim = strchr(nm, '@');
1289 if (pdelim == NULL)
1290 continue;
1291 *pdelim = '\0';
1292
1293 do {
1294 if (nvlist_lookup_uint64(cnt_track, nm,
1295 &val) == 0) {
1296 /* update existing entry */
1297 fnvlist_add_uint64(cnt_track, nm,
1298 val + 1);
1299 } else {
1300 /* add to list */
1301 fnvlist_add_uint64(cnt_track, nm, 1);
1302 }
1303
1304 pdelim = strrchr(nm, '/');
1305 if (pdelim != NULL)
1306 *pdelim = '\0';
1307 } while (pdelim != NULL);
1308 }
1309
1310 /* Check aggregated counts at each level */
1311 for (pair = nvlist_next_nvpair(cnt_track, NULL);
1312 pair != NULL; pair = nvlist_next_nvpair(cnt_track, pair)) {
1313 int error = 0;
1314 char *name;
1315 uint64_t cnt = 0;
1316 dsl_dataset_t *ds;
1317
1318 name = nvpair_name(pair);
1319 cnt = fnvpair_value_uint64(pair);
1320 ASSERT(cnt > 0);
1321
1322 error = dsl_dataset_hold(dp, name, FTAG, &ds);
1323 if (error == 0) {
1324 error = dsl_fs_ss_limit_check(ds->ds_dir, cnt,
1325 ZFS_PROP_SNAPSHOT_LIMIT, NULL,
1326 ddsa->ddsa_cr);
1327 dsl_dataset_rele(ds, FTAG);
1328 }
1329
1330 if (error != 0) {
1331 if (ddsa->ddsa_errors != NULL)
1332 fnvlist_add_int32(ddsa->ddsa_errors,
1333 name, error);
1334 rv = error;
1335 /* only report one error for this check */
1336 break;
1337 }
1338 }
1339 nvlist_free(cnt_track);
1340 }
1341
1342 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL);
1343 pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) {
1344 int error = 0;
1345 dsl_dataset_t *ds;
1346 char *name, *atp;
1347 char dsname[ZFS_MAX_DATASET_NAME_LEN];
1348
1349 name = nvpair_name(pair);
1350 if (strlen(name) >= ZFS_MAX_DATASET_NAME_LEN)
1351 error = SET_ERROR(ENAMETOOLONG);
1352 if (error == 0) {
1353 atp = strchr(name, '@');
1354 if (atp == NULL)
1355 error = SET_ERROR(EINVAL);
1356 if (error == 0)
1357 (void) strlcpy(dsname, name, atp - name + 1);
1358 }
1359 if (error == 0)
1360 error = dsl_dataset_hold(dp, dsname, FTAG, &ds);
1361 if (error == 0) {
1362 /* passing 0/NULL skips dsl_fs_ss_limit_check */
1363 error = dsl_dataset_snapshot_check_impl(ds,
1364 atp + 1, tx, B_FALSE, 0, NULL);
1365 dsl_dataset_rele(ds, FTAG);
1366 }
1367
1368 if (error != 0) {
1369 if (ddsa->ddsa_errors != NULL) {
1370 fnvlist_add_int32(ddsa->ddsa_errors,
1371 name, error);
1372 }
1373 rv = error;
1374 }
1375 }
1376
1377 return (rv);
1378 }
1379
1380 void
dsl_dataset_snapshot_sync_impl(dsl_dataset_t * ds,const char * snapname,dmu_tx_t * tx)1381 dsl_dataset_snapshot_sync_impl(dsl_dataset_t *ds, const char *snapname,
1382 dmu_tx_t *tx)
1383 {
1384 dsl_pool_t *dp = ds->ds_dir->dd_pool;
1385 dmu_buf_t *dbuf;
1386 dsl_dataset_phys_t *dsphys;
1387 uint64_t dsobj, crtxg;
1388 objset_t *mos = dp->dp_meta_objset;
1389 objset_t *os;
1390
1391 ASSERT(RRW_WRITE_HELD(&dp->dp_config_rwlock));
1392
1393 /*
1394 * If we are on an old pool, the zil must not be active, in which
1395 * case it will be zeroed. Usually zil_suspend() accomplishes this.
1396 */
1397 ASSERT(spa_version(dmu_tx_pool(tx)->dp_spa) >= SPA_VERSION_FAST_SNAP ||
1398 dmu_objset_from_ds(ds, &os) != 0 ||
1399 bcmp(&os->os_phys->os_zil_header, &zero_zil,
1400 sizeof (zero_zil)) == 0);
1401
1402 /* Should not snapshot a dirty dataset. */
1403 ASSERT(!txg_list_member(&ds->ds_dir->dd_pool->dp_dirty_datasets,
1404 ds, tx->tx_txg));
1405
1406 dsl_fs_ss_count_adjust(ds->ds_dir, 1, DD_FIELD_SNAPSHOT_COUNT, tx);
1407
1408 /*
1409 * The origin's ds_creation_txg has to be < TXG_INITIAL
1410 */
1411 if (strcmp(snapname, ORIGIN_DIR_NAME) == 0)
1412 crtxg = 1;
1413 else
1414 crtxg = tx->tx_txg;
1415
1416 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0,
1417 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx);
1418 VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf));
1419 dmu_buf_will_dirty(dbuf, tx);
1420 dsphys = dbuf->db_data;
1421 bzero(dsphys, sizeof (dsl_dataset_phys_t));
1422 dsphys->ds_dir_obj = ds->ds_dir->dd_object;
1423 dsphys->ds_fsid_guid = unique_create();
1424 do {
1425 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid,
1426 sizeof (dsphys->ds_guid));
1427 } while (dsphys->ds_guid == 0);
1428 dsphys->ds_prev_snap_obj = dsl_dataset_phys(ds)->ds_prev_snap_obj;
1429 dsphys->ds_prev_snap_txg = dsl_dataset_phys(ds)->ds_prev_snap_txg;
1430 dsphys->ds_next_snap_obj = ds->ds_object;
1431 dsphys->ds_num_children = 1;
1432 dsphys->ds_creation_time = gethrestime_sec();
1433 dsphys->ds_creation_txg = crtxg;
1434 dsphys->ds_deadlist_obj = dsl_dataset_phys(ds)->ds_deadlist_obj;
1435 dsphys->ds_referenced_bytes = dsl_dataset_phys(ds)->ds_referenced_bytes;
1436 dsphys->ds_compressed_bytes = dsl_dataset_phys(ds)->ds_compressed_bytes;
1437 dsphys->ds_uncompressed_bytes =
1438 dsl_dataset_phys(ds)->ds_uncompressed_bytes;
1439 dsphys->ds_flags = dsl_dataset_phys(ds)->ds_flags;
1440 rrw_enter(&ds->ds_bp_rwlock, RW_READER, FTAG);
1441 dsphys->ds_bp = dsl_dataset_phys(ds)->ds_bp;
1442 rrw_exit(&ds->ds_bp_rwlock, FTAG);
1443 dmu_buf_rele(dbuf, FTAG);
1444
1445 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) {
1446 if (ds->ds_feature_inuse[f])
1447 dsl_dataset_activate_feature(dsobj, f, tx);
1448 }
1449
1450 ASSERT3U(ds->ds_prev != 0, ==,
1451 dsl_dataset_phys(ds)->ds_prev_snap_obj != 0);
1452 if (ds->ds_prev) {
1453 uint64_t next_clones_obj =
1454 dsl_dataset_phys(ds->ds_prev)->ds_next_clones_obj;
1455 ASSERT(dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj ==
1456 ds->ds_object ||
1457 dsl_dataset_phys(ds->ds_prev)->ds_num_children > 1);
1458 if (dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj ==
1459 ds->ds_object) {
1460 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx);
1461 ASSERT3U(dsl_dataset_phys(ds)->ds_prev_snap_txg, ==,
1462 dsl_dataset_phys(ds->ds_prev)->ds_creation_txg);
1463 dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj = dsobj;
1464 } else if (next_clones_obj != 0) {
1465 dsl_dataset_remove_from_next_clones(ds->ds_prev,
1466 dsphys->ds_next_snap_obj, tx);
1467 VERIFY0(zap_add_int(mos,
1468 next_clones_obj, dsobj, tx));
1469 }
1470 }
1471
1472 /*
1473 * If we have a reference-reservation on this dataset, we will
1474 * need to increase the amount of refreservation being charged
1475 * since our unique space is going to zero.
1476 */
1477 if (ds->ds_reserved) {
1478 int64_t delta;
1479 ASSERT(DS_UNIQUE_IS_ACCURATE(ds));
1480 delta = MIN(dsl_dataset_phys(ds)->ds_unique_bytes,
1481 ds->ds_reserved);
1482 dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV,
1483 delta, 0, 0, tx);
1484 }
1485
1486 dmu_buf_will_dirty(ds->ds_dbuf, tx);
1487 dsl_dataset_phys(ds)->ds_deadlist_obj =
1488 dsl_deadlist_clone(&ds->ds_deadlist, UINT64_MAX,
1489 dsl_dataset_phys(ds)->ds_prev_snap_obj, tx);
1490 dsl_deadlist_close(&ds->ds_deadlist);
1491 dsl_deadlist_open(&ds->ds_deadlist, mos,
1492 dsl_dataset_phys(ds)->ds_deadlist_obj);
1493 dsl_deadlist_add_key(&ds->ds_deadlist,
1494 dsl_dataset_phys(ds)->ds_prev_snap_txg, tx);
1495
1496 ASSERT3U(dsl_dataset_phys(ds)->ds_prev_snap_txg, <, tx->tx_txg);
1497 dsl_dataset_phys(ds)->ds_prev_snap_obj = dsobj;
1498 dsl_dataset_phys(ds)->ds_prev_snap_txg = crtxg;
1499 dsl_dataset_phys(ds)->ds_unique_bytes = 0;
1500 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE)
1501 dsl_dataset_phys(ds)->ds_flags |= DS_FLAG_UNIQUE_ACCURATE;
1502
1503 VERIFY0(zap_add(mos, dsl_dataset_phys(ds)->ds_snapnames_zapobj,
1504 snapname, 8, 1, &dsobj, tx));
1505
1506 if (ds->ds_prev)
1507 dsl_dataset_rele(ds->ds_prev, ds);
1508 VERIFY0(dsl_dataset_hold_obj(dp,
1509 dsl_dataset_phys(ds)->ds_prev_snap_obj, ds, &ds->ds_prev));
1510
1511 dsl_scan_ds_snapshotted(ds, tx);
1512
1513 dsl_dir_snap_cmtime_update(ds->ds_dir);
1514
1515 spa_history_log_internal_ds(ds->ds_prev, "snapshot", tx, "");
1516 }
1517
1518 static void
dsl_dataset_snapshot_sync(void * arg,dmu_tx_t * tx)1519 dsl_dataset_snapshot_sync(void *arg, dmu_tx_t *tx)
1520 {
1521 dsl_dataset_snapshot_arg_t *ddsa = arg;
1522 dsl_pool_t *dp = dmu_tx_pool(tx);
1523 nvpair_t *pair;
1524
1525 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL);
1526 pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) {
1527 dsl_dataset_t *ds;
1528 char *name, *atp;
1529 char dsname[ZFS_MAX_DATASET_NAME_LEN];
1530
1531 name = nvpair_name(pair);
1532 atp = strchr(name, '@');
1533 (void) strlcpy(dsname, name, atp - name + 1);
1534 VERIFY0(dsl_dataset_hold(dp, dsname, FTAG, &ds));
1535
1536 dsl_dataset_snapshot_sync_impl(ds, atp + 1, tx);
1537 if (ddsa->ddsa_props != NULL) {
1538 dsl_props_set_sync_impl(ds->ds_prev,
1539 ZPROP_SRC_LOCAL, ddsa->ddsa_props, tx);
1540 }
1541 dsl_dataset_rele(ds, FTAG);
1542 }
1543 }
1544
1545 /*
1546 * The snapshots must all be in the same pool.
1547 * All-or-nothing: if there are any failures, nothing will be modified.
1548 */
1549 int
dsl_dataset_snapshot(nvlist_t * snaps,nvlist_t * props,nvlist_t * errors)1550 dsl_dataset_snapshot(nvlist_t *snaps, nvlist_t *props, nvlist_t *errors)
1551 {
1552 dsl_dataset_snapshot_arg_t ddsa;
1553 nvpair_t *pair;
1554 boolean_t needsuspend;
1555 int error;
1556 spa_t *spa;
1557 char *firstname;
1558 nvlist_t *suspended = NULL;
1559
1560 pair = nvlist_next_nvpair(snaps, NULL);
1561 if (pair == NULL)
1562 return (0);
1563 firstname = nvpair_name(pair);
1564
1565 error = spa_open(firstname, &spa, FTAG);
1566 if (error != 0)
1567 return (error);
1568 needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP);
1569 spa_close(spa, FTAG);
1570
1571 if (needsuspend) {
1572 suspended = fnvlist_alloc();
1573 for (pair = nvlist_next_nvpair(snaps, NULL); pair != NULL;
1574 pair = nvlist_next_nvpair(snaps, pair)) {
1575 char fsname[ZFS_MAX_DATASET_NAME_LEN];
1576 char *snapname = nvpair_name(pair);
1577 char *atp;
1578 void *cookie;
1579
1580 atp = strchr(snapname, '@');
1581 if (atp == NULL) {
1582 error = SET_ERROR(EINVAL);
1583 break;
1584 }
1585 (void) strlcpy(fsname, snapname, atp - snapname + 1);
1586
1587 error = zil_suspend(fsname, &cookie);
1588 if (error != 0)
1589 break;
1590 fnvlist_add_uint64(suspended, fsname,
1591 (uintptr_t)cookie);
1592 }
1593 }
1594
1595 ddsa.ddsa_snaps = snaps;
1596 ddsa.ddsa_props = props;
1597 ddsa.ddsa_errors = errors;
1598 ddsa.ddsa_cr = CRED();
1599
1600 if (error == 0) {
1601 error = dsl_sync_task(firstname, dsl_dataset_snapshot_check,
1602 dsl_dataset_snapshot_sync, &ddsa,
1603 fnvlist_num_pairs(snaps) * 3, ZFS_SPACE_CHECK_NORMAL);
1604 }
1605
1606 if (suspended != NULL) {
1607 for (pair = nvlist_next_nvpair(suspended, NULL); pair != NULL;
1608 pair = nvlist_next_nvpair(suspended, pair)) {
1609 zil_resume((void *)(uintptr_t)
1610 fnvpair_value_uint64(pair));
1611 }
1612 fnvlist_free(suspended);
1613 }
1614
1615 #if defined(__FreeBSD__) || defined(__NetBSD__)
1616 #ifdef _KERNEL
1617 if (error == 0) {
1618 for (pair = nvlist_next_nvpair(snaps, NULL); pair != NULL;
1619 pair = nvlist_next_nvpair(snaps, pair)) {
1620 char *snapname = nvpair_name(pair);
1621 zvol_create_minors(snapname);
1622 }
1623 }
1624 #endif
1625 #endif
1626 return (error);
1627 }
1628
1629 typedef struct dsl_dataset_snapshot_tmp_arg {
1630 const char *ddsta_fsname;
1631 const char *ddsta_snapname;
1632 minor_t ddsta_cleanup_minor;
1633 const char *ddsta_htag;
1634 } dsl_dataset_snapshot_tmp_arg_t;
1635
1636 static int
dsl_dataset_snapshot_tmp_check(void * arg,dmu_tx_t * tx)1637 dsl_dataset_snapshot_tmp_check(void *arg, dmu_tx_t *tx)
1638 {
1639 dsl_dataset_snapshot_tmp_arg_t *ddsta = arg;
1640 dsl_pool_t *dp = dmu_tx_pool(tx);
1641 dsl_dataset_t *ds;
1642 int error;
1643
1644 error = dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds);
1645 if (error != 0)
1646 return (error);
1647
1648 /* NULL cred means no limit check for tmp snapshot */
1649 error = dsl_dataset_snapshot_check_impl(ds, ddsta->ddsta_snapname,
1650 tx, B_FALSE, 0, NULL);
1651 if (error != 0) {
1652 dsl_dataset_rele(ds, FTAG);
1653 return (error);
1654 }
1655
1656 if (spa_version(dp->dp_spa) < SPA_VERSION_USERREFS) {
1657 dsl_dataset_rele(ds, FTAG);
1658 return (SET_ERROR(ENOTSUP));
1659 }
1660 error = dsl_dataset_user_hold_check_one(NULL, ddsta->ddsta_htag,
1661 B_TRUE, tx);
1662 if (error != 0) {
1663 dsl_dataset_rele(ds, FTAG);
1664 return (error);
1665 }
1666
1667 dsl_dataset_rele(ds, FTAG);
1668 return (0);
1669 }
1670
1671 static void
dsl_dataset_snapshot_tmp_sync(void * arg,dmu_tx_t * tx)1672 dsl_dataset_snapshot_tmp_sync(void *arg, dmu_tx_t *tx)
1673 {
1674 dsl_dataset_snapshot_tmp_arg_t *ddsta = arg;
1675 dsl_pool_t *dp = dmu_tx_pool(tx);
1676 dsl_dataset_t *ds;
1677
1678 VERIFY0(dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds));
1679
1680 dsl_dataset_snapshot_sync_impl(ds, ddsta->ddsta_snapname, tx);
1681 dsl_dataset_user_hold_sync_one(ds->ds_prev, ddsta->ddsta_htag,
1682 ddsta->ddsta_cleanup_minor, gethrestime_sec(), tx);
1683 dsl_destroy_snapshot_sync_impl(ds->ds_prev, B_TRUE, tx);
1684
1685 dsl_dataset_rele(ds, FTAG);
1686 }
1687
1688 int
dsl_dataset_snapshot_tmp(const char * fsname,const char * snapname,minor_t cleanup_minor,const char * htag)1689 dsl_dataset_snapshot_tmp(const char *fsname, const char *snapname,
1690 minor_t cleanup_minor, const char *htag)
1691 {
1692 dsl_dataset_snapshot_tmp_arg_t ddsta;
1693 int error;
1694 spa_t *spa;
1695 boolean_t needsuspend;
1696 void *cookie;
1697
1698 ddsta.ddsta_fsname = fsname;
1699 ddsta.ddsta_snapname = snapname;
1700 ddsta.ddsta_cleanup_minor = cleanup_minor;
1701 ddsta.ddsta_htag = htag;
1702
1703 error = spa_open(fsname, &spa, FTAG);
1704 if (error != 0)
1705 return (error);
1706 needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP);
1707 spa_close(spa, FTAG);
1708
1709 if (needsuspend) {
1710 error = zil_suspend(fsname, &cookie);
1711 if (error != 0)
1712 return (error);
1713 }
1714
1715 error = dsl_sync_task(fsname, dsl_dataset_snapshot_tmp_check,
1716 dsl_dataset_snapshot_tmp_sync, &ddsta, 3, ZFS_SPACE_CHECK_RESERVED);
1717
1718 if (needsuspend)
1719 zil_resume(cookie);
1720 return (error);
1721 }
1722
1723
1724 void
dsl_dataset_sync(dsl_dataset_t * ds,zio_t * zio,dmu_tx_t * tx)1725 dsl_dataset_sync(dsl_dataset_t *ds, zio_t *zio, dmu_tx_t *tx)
1726 {
1727 ASSERT(dmu_tx_is_syncing(tx));
1728 ASSERT(ds->ds_objset != NULL);
1729 ASSERT(dsl_dataset_phys(ds)->ds_next_snap_obj == 0);
1730
1731 /*
1732 * in case we had to change ds_fsid_guid when we opened it,
1733 * sync it out now.
1734 */
1735 dmu_buf_will_dirty(ds->ds_dbuf, tx);
1736 dsl_dataset_phys(ds)->ds_fsid_guid = ds->ds_fsid_guid;
1737
1738 if (ds->ds_resume_bytes[tx->tx_txg & TXG_MASK] != 0) {
1739 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset,
1740 ds->ds_object, DS_FIELD_RESUME_OBJECT, 8, 1,
1741 &ds->ds_resume_object[tx->tx_txg & TXG_MASK], tx));
1742 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset,
1743 ds->ds_object, DS_FIELD_RESUME_OFFSET, 8, 1,
1744 &ds->ds_resume_offset[tx->tx_txg & TXG_MASK], tx));
1745 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset,
1746 ds->ds_object, DS_FIELD_RESUME_BYTES, 8, 1,
1747 &ds->ds_resume_bytes[tx->tx_txg & TXG_MASK], tx));
1748 ds->ds_resume_object[tx->tx_txg & TXG_MASK] = 0;
1749 ds->ds_resume_offset[tx->tx_txg & TXG_MASK] = 0;
1750 ds->ds_resume_bytes[tx->tx_txg & TXG_MASK] = 0;
1751 }
1752
1753 dmu_objset_sync(ds->ds_objset, zio, tx);
1754
1755 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) {
1756 if (ds->ds_feature_activation_needed[f]) {
1757 if (ds->ds_feature_inuse[f])
1758 continue;
1759 dsl_dataset_activate_feature(ds->ds_object, f, tx);
1760 ds->ds_feature_inuse[f] = B_TRUE;
1761 }
1762 }
1763 }
1764
1765 static int
deadlist_enqueue_cb(void * arg,const blkptr_t * bp,dmu_tx_t * tx)1766 deadlist_enqueue_cb(void *arg, const blkptr_t *bp, dmu_tx_t *tx)
1767 {
1768 dsl_deadlist_t *dl = arg;
1769 dsl_deadlist_insert(dl, bp, tx);
1770 return (0);
1771 }
1772
1773 void
dsl_dataset_sync_done(dsl_dataset_t * ds,dmu_tx_t * tx)1774 dsl_dataset_sync_done(dsl_dataset_t *ds, dmu_tx_t *tx)
1775 {
1776 objset_t *os = ds->ds_objset;
1777
1778 bplist_iterate(&ds->ds_pending_deadlist,
1779 deadlist_enqueue_cb, &ds->ds_deadlist, tx);
1780
1781 ASSERT(!dmu_objset_is_dirty(os, dmu_tx_get_txg(tx)));
1782
1783 dmu_buf_rele(ds->ds_dbuf, ds);
1784 }
1785
1786 static void
get_clones_stat(dsl_dataset_t * ds,nvlist_t * nv)1787 get_clones_stat(dsl_dataset_t *ds, nvlist_t *nv)
1788 {
1789 uint64_t count = 0;
1790 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
1791 zap_cursor_t zc;
1792 zap_attribute_t za;
1793 nvlist_t *propval = fnvlist_alloc();
1794 nvlist_t *val;
1795
1796 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool));
1797
1798 /*
1799 * We use nvlist_alloc() instead of fnvlist_alloc() because the
1800 * latter would allocate the list with NV_UNIQUE_NAME flag.
1801 * As a result, every time a clone name is appended to the list
1802 * it would be (linearly) searched for for a duplicate name.
1803 * We already know that all clone names must be unique and we
1804 * want avoid the quadratic complexity of double-checking that
1805 * because we can have a large number of clones.
1806 */
1807 VERIFY0(nvlist_alloc(&val, 0, KM_SLEEP));
1808
1809 /*
1810 * There may be missing entries in ds_next_clones_obj
1811 * due to a bug in a previous version of the code.
1812 * Only trust it if it has the right number of entries.
1813 */
1814 if (dsl_dataset_phys(ds)->ds_next_clones_obj != 0) {
1815 VERIFY0(zap_count(mos, dsl_dataset_phys(ds)->ds_next_clones_obj,
1816 &count));
1817 }
1818 if (count != dsl_dataset_phys(ds)->ds_num_children - 1)
1819 goto fail;
1820 for (zap_cursor_init(&zc, mos,
1821 dsl_dataset_phys(ds)->ds_next_clones_obj);
1822 zap_cursor_retrieve(&zc, &za) == 0;
1823 zap_cursor_advance(&zc)) {
1824 dsl_dataset_t *clone;
1825 char buf[ZFS_MAX_DATASET_NAME_LEN];
1826 VERIFY0(dsl_dataset_hold_obj(ds->ds_dir->dd_pool,
1827 za.za_first_integer, FTAG, &clone));
1828 dsl_dir_name(clone->ds_dir, buf);
1829 fnvlist_add_boolean(val, buf);
1830 dsl_dataset_rele(clone, FTAG);
1831 }
1832 zap_cursor_fini(&zc);
1833 fnvlist_add_nvlist(propval, ZPROP_VALUE, val);
1834 fnvlist_add_nvlist(nv, zfs_prop_to_name(ZFS_PROP_CLONES), propval);
1835 fail:
1836 nvlist_free(val);
1837 nvlist_free(propval);
1838 }
1839
1840 static void
get_receive_resume_stats(dsl_dataset_t * ds,nvlist_t * nv)1841 get_receive_resume_stats(dsl_dataset_t *ds, nvlist_t *nv)
1842 {
1843 dsl_pool_t *dp = ds->ds_dir->dd_pool;
1844
1845 if (dsl_dataset_has_resume_receive_state(ds)) {
1846 char *str;
1847 void *packed;
1848 uint8_t *compressed;
1849 uint64_t val;
1850 nvlist_t *token_nv = fnvlist_alloc();
1851 size_t packed_size, compressed_size;
1852
1853 if (zap_lookup(dp->dp_meta_objset, ds->ds_object,
1854 DS_FIELD_RESUME_FROMGUID, sizeof (val), 1, &val) == 0) {
1855 fnvlist_add_uint64(token_nv, "fromguid", val);
1856 }
1857 if (zap_lookup(dp->dp_meta_objset, ds->ds_object,
1858 DS_FIELD_RESUME_OBJECT, sizeof (val), 1, &val) == 0) {
1859 fnvlist_add_uint64(token_nv, "object", val);
1860 }
1861 if (zap_lookup(dp->dp_meta_objset, ds->ds_object,
1862 DS_FIELD_RESUME_OFFSET, sizeof (val), 1, &val) == 0) {
1863 fnvlist_add_uint64(token_nv, "offset", val);
1864 }
1865 if (zap_lookup(dp->dp_meta_objset, ds->ds_object,
1866 DS_FIELD_RESUME_BYTES, sizeof (val), 1, &val) == 0) {
1867 fnvlist_add_uint64(token_nv, "bytes", val);
1868 }
1869 if (zap_lookup(dp->dp_meta_objset, ds->ds_object,
1870 DS_FIELD_RESUME_TOGUID, sizeof (val), 1, &val) == 0) {
1871 fnvlist_add_uint64(token_nv, "toguid", val);
1872 }
1873 char buf[256];
1874 if (zap_lookup(dp->dp_meta_objset, ds->ds_object,
1875 DS_FIELD_RESUME_TONAME, 1, sizeof (buf), buf) == 0) {
1876 fnvlist_add_string(token_nv, "toname", buf);
1877 }
1878 if (zap_contains(dp->dp_meta_objset, ds->ds_object,
1879 DS_FIELD_RESUME_EMBEDOK) == 0) {
1880 fnvlist_add_boolean(token_nv, "embedok");
1881 }
1882 packed = fnvlist_pack(token_nv, &packed_size);
1883 fnvlist_free(token_nv);
1884 compressed = kmem_alloc(packed_size, KM_SLEEP);
1885
1886 compressed_size = gzip_compress(packed, compressed,
1887 packed_size, packed_size, 6);
1888
1889 zio_cksum_t cksum;
1890 fletcher_4_native(compressed, compressed_size, NULL, &cksum);
1891
1892 str = kmem_alloc(compressed_size * 2 + 1, KM_SLEEP);
1893 for (int i = 0; i < compressed_size; i++) {
1894 (void) sprintf(str + i * 2, "%02x", compressed[i]);
1895 }
1896 str[compressed_size * 2] = '\0';
1897 char *propval = kmem_asprintf("%u-%llx-%llx-%s",
1898 ZFS_SEND_RESUME_TOKEN_VERSION,
1899 (longlong_t)cksum.zc_word[0],
1900 (longlong_t)packed_size, str);
1901 dsl_prop_nvlist_add_string(nv,
1902 ZFS_PROP_RECEIVE_RESUME_TOKEN, propval);
1903 kmem_free(packed, packed_size);
1904 kmem_free(str, compressed_size * 2 + 1);
1905 kmem_free(compressed, packed_size);
1906 strfree(propval);
1907 }
1908 }
1909
1910 void
dsl_dataset_stats(dsl_dataset_t * ds,nvlist_t * nv)1911 dsl_dataset_stats(dsl_dataset_t *ds, nvlist_t *nv)
1912 {
1913 dsl_pool_t *dp = ds->ds_dir->dd_pool;
1914 uint64_t refd, avail, uobjs, aobjs, ratio;
1915
1916 ASSERT(dsl_pool_config_held(dp));
1917
1918 ratio = dsl_dataset_phys(ds)->ds_compressed_bytes == 0 ? 100 :
1919 (dsl_dataset_phys(ds)->ds_uncompressed_bytes * 100 /
1920 dsl_dataset_phys(ds)->ds_compressed_bytes);
1921
1922 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRATIO, ratio);
1923 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_LOGICALREFERENCED,
1924 dsl_dataset_phys(ds)->ds_uncompressed_bytes);
1925
1926 if (ds->ds_is_snapshot) {
1927 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_COMPRESSRATIO, ratio);
1928 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USED,
1929 dsl_dataset_phys(ds)->ds_unique_bytes);
1930 get_clones_stat(ds, nv);
1931 } else {
1932 if (ds->ds_prev != NULL && ds->ds_prev != dp->dp_origin_snap) {
1933 char buf[ZFS_MAX_DATASET_NAME_LEN];
1934 dsl_dataset_name(ds->ds_prev, buf);
1935 dsl_prop_nvlist_add_string(nv, ZFS_PROP_PREV_SNAP, buf);
1936 }
1937
1938 dsl_dir_stats(ds->ds_dir, nv);
1939 }
1940
1941 dsl_dataset_space(ds, &refd, &avail, &uobjs, &aobjs);
1942 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_AVAILABLE, avail);
1943 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFERENCED, refd);
1944
1945 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATION,
1946 dsl_dataset_phys(ds)->ds_creation_time);
1947 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATETXG,
1948 dsl_dataset_phys(ds)->ds_creation_txg);
1949 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFQUOTA,
1950 ds->ds_quota);
1951 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRESERVATION,
1952 ds->ds_reserved);
1953 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_GUID,
1954 dsl_dataset_phys(ds)->ds_guid);
1955 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_UNIQUE,
1956 dsl_dataset_phys(ds)->ds_unique_bytes);
1957 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_OBJSETID,
1958 ds->ds_object);
1959 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USERREFS,
1960 ds->ds_userrefs);
1961 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_DEFER_DESTROY,
1962 DS_IS_DEFER_DESTROY(ds) ? 1 : 0);
1963
1964 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) {
1965 uint64_t written, comp, uncomp;
1966 dsl_pool_t *dp = ds->ds_dir->dd_pool;
1967 dsl_dataset_t *prev;
1968
1969 int err = dsl_dataset_hold_obj(dp,
1970 dsl_dataset_phys(ds)->ds_prev_snap_obj, FTAG, &prev);
1971 if (err == 0) {
1972 err = dsl_dataset_space_written(prev, ds, &written,
1973 &comp, &uncomp);
1974 dsl_dataset_rele(prev, FTAG);
1975 if (err == 0) {
1976 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_WRITTEN,
1977 written);
1978 }
1979 }
1980 }
1981
1982 if (!dsl_dataset_is_snapshot(ds)) {
1983 /*
1984 * A failed "newfs" (e.g. full) resumable receive leaves
1985 * the stats set on this dataset. Check here for the prop.
1986 */
1987 get_receive_resume_stats(ds, nv);
1988
1989 /*
1990 * A failed incremental resumable receive leaves the
1991 * stats set on our child named "%recv". Check the child
1992 * for the prop.
1993 */
1994 /* 6 extra bytes for /%recv */
1995 char recvname[ZFS_MAX_DATASET_NAME_LEN + 6];
1996 dsl_dataset_t *recv_ds;
1997 dsl_dataset_name(ds, recvname);
1998 if (strlcat(recvname, "/", sizeof (recvname)) <
1999 sizeof (recvname) &&
2000 strlcat(recvname, recv_clone_name, sizeof (recvname)) <
2001 sizeof (recvname) &&
2002 dsl_dataset_hold(dp, recvname, FTAG, &recv_ds) == 0) {
2003 get_receive_resume_stats(recv_ds, nv);
2004 dsl_dataset_rele(recv_ds, FTAG);
2005 }
2006 }
2007 }
2008
2009 void
dsl_dataset_fast_stat(dsl_dataset_t * ds,dmu_objset_stats_t * stat)2010 dsl_dataset_fast_stat(dsl_dataset_t *ds, dmu_objset_stats_t *stat)
2011 {
2012 dsl_pool_t *dp = ds->ds_dir->dd_pool;
2013 ASSERT(dsl_pool_config_held(dp));
2014
2015 stat->dds_creation_txg = dsl_dataset_phys(ds)->ds_creation_txg;
2016 stat->dds_inconsistent =
2017 dsl_dataset_phys(ds)->ds_flags & DS_FLAG_INCONSISTENT;
2018 stat->dds_guid = dsl_dataset_phys(ds)->ds_guid;
2019 stat->dds_origin[0] = '\0';
2020 if (ds->ds_is_snapshot) {
2021 stat->dds_is_snapshot = B_TRUE;
2022 stat->dds_num_clones =
2023 dsl_dataset_phys(ds)->ds_num_children - 1;
2024 } else {
2025 stat->dds_is_snapshot = B_FALSE;
2026 stat->dds_num_clones = 0;
2027
2028 if (dsl_dir_is_clone(ds->ds_dir)) {
2029 dsl_dataset_t *ods;
2030
2031 VERIFY0(dsl_dataset_hold_obj(dp,
2032 dsl_dir_phys(ds->ds_dir)->dd_origin_obj,
2033 FTAG, &ods));
2034 dsl_dataset_name(ods, stat->dds_origin);
2035 dsl_dataset_rele(ods, FTAG);
2036 }
2037 }
2038 }
2039
2040 uint64_t
dsl_dataset_fsid_guid(dsl_dataset_t * ds)2041 dsl_dataset_fsid_guid(dsl_dataset_t *ds)
2042 {
2043 return (ds->ds_fsid_guid);
2044 }
2045
2046 void
dsl_dataset_space(dsl_dataset_t * ds,uint64_t * refdbytesp,uint64_t * availbytesp,uint64_t * usedobjsp,uint64_t * availobjsp)2047 dsl_dataset_space(dsl_dataset_t *ds,
2048 uint64_t *refdbytesp, uint64_t *availbytesp,
2049 uint64_t *usedobjsp, uint64_t *availobjsp)
2050 {
2051 *refdbytesp = dsl_dataset_phys(ds)->ds_referenced_bytes;
2052 *availbytesp = dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE);
2053 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes)
2054 *availbytesp +=
2055 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes;
2056 if (ds->ds_quota != 0) {
2057 /*
2058 * Adjust available bytes according to refquota
2059 */
2060 if (*refdbytesp < ds->ds_quota)
2061 *availbytesp = MIN(*availbytesp,
2062 ds->ds_quota - *refdbytesp);
2063 else
2064 *availbytesp = 0;
2065 }
2066 rrw_enter(&ds->ds_bp_rwlock, RW_READER, FTAG);
2067 *usedobjsp = BP_GET_FILL(&dsl_dataset_phys(ds)->ds_bp);
2068 rrw_exit(&ds->ds_bp_rwlock, FTAG);
2069 *availobjsp = DN_MAX_OBJECT - *usedobjsp;
2070 }
2071
2072 boolean_t
dsl_dataset_modified_since_snap(dsl_dataset_t * ds,dsl_dataset_t * snap)2073 dsl_dataset_modified_since_snap(dsl_dataset_t *ds, dsl_dataset_t *snap)
2074 {
2075 dsl_pool_t *dp = ds->ds_dir->dd_pool;
2076 uint64_t birth;
2077
2078 ASSERT(dsl_pool_config_held(dp));
2079 if (snap == NULL)
2080 return (B_FALSE);
2081 rrw_enter(&ds->ds_bp_rwlock, RW_READER, FTAG);
2082 birth = dsl_dataset_get_blkptr(ds)->blk_birth;
2083 rrw_exit(&ds->ds_bp_rwlock, FTAG);
2084 if (birth > dsl_dataset_phys(snap)->ds_creation_txg) {
2085 objset_t *os, *os_snap;
2086 /*
2087 * It may be that only the ZIL differs, because it was
2088 * reset in the head. Don't count that as being
2089 * modified.
2090 */
2091 if (dmu_objset_from_ds(ds, &os) != 0)
2092 return (B_TRUE);
2093 if (dmu_objset_from_ds(snap, &os_snap) != 0)
2094 return (B_TRUE);
2095 return (bcmp(&os->os_phys->os_meta_dnode,
2096 &os_snap->os_phys->os_meta_dnode,
2097 sizeof (os->os_phys->os_meta_dnode)) != 0);
2098 }
2099 return (B_FALSE);
2100 }
2101
2102 typedef struct dsl_dataset_rename_snapshot_arg {
2103 const char *ddrsa_fsname;
2104 const char *ddrsa_oldsnapname;
2105 const char *ddrsa_newsnapname;
2106 boolean_t ddrsa_recursive;
2107 dmu_tx_t *ddrsa_tx;
2108 } dsl_dataset_rename_snapshot_arg_t;
2109
2110 /* ARGSUSED */
2111 static int
dsl_dataset_rename_snapshot_check_impl(dsl_pool_t * dp,dsl_dataset_t * hds,void * arg)2112 dsl_dataset_rename_snapshot_check_impl(dsl_pool_t *dp,
2113 dsl_dataset_t *hds, void *arg)
2114 {
2115 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg;
2116 int error;
2117 uint64_t val;
2118
2119 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val);
2120 if (error != 0) {
2121 /* ignore nonexistent snapshots */
2122 return (error == ENOENT ? 0 : error);
2123 }
2124
2125 /* new name should not exist */
2126 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_newsnapname, &val);
2127 if (error == 0)
2128 error = SET_ERROR(EEXIST);
2129 else if (error == ENOENT)
2130 error = 0;
2131
2132 /* dataset name + 1 for the "@" + the new snapshot name must fit */
2133 if (dsl_dir_namelen(hds->ds_dir) + 1 +
2134 strlen(ddrsa->ddrsa_newsnapname) >= ZFS_MAX_DATASET_NAME_LEN)
2135 error = SET_ERROR(ENAMETOOLONG);
2136
2137 return (error);
2138 }
2139
2140 static int
dsl_dataset_rename_snapshot_check(void * arg,dmu_tx_t * tx)2141 dsl_dataset_rename_snapshot_check(void *arg, dmu_tx_t *tx)
2142 {
2143 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg;
2144 dsl_pool_t *dp = dmu_tx_pool(tx);
2145 dsl_dataset_t *hds;
2146 int error;
2147
2148 error = dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds);
2149 if (error != 0)
2150 return (error);
2151
2152 if (ddrsa->ddrsa_recursive) {
2153 error = dmu_objset_find_dp(dp, hds->ds_dir->dd_object,
2154 dsl_dataset_rename_snapshot_check_impl, ddrsa,
2155 DS_FIND_CHILDREN);
2156 } else {
2157 error = dsl_dataset_rename_snapshot_check_impl(dp, hds, ddrsa);
2158 }
2159 dsl_dataset_rele(hds, FTAG);
2160 return (error);
2161 }
2162
2163 static int
dsl_dataset_rename_snapshot_sync_impl(dsl_pool_t * dp,dsl_dataset_t * hds,void * arg)2164 dsl_dataset_rename_snapshot_sync_impl(dsl_pool_t *dp,
2165 dsl_dataset_t *hds, void *arg)
2166 {
2167 #if defined(__FreeBSD__) || defined(__NetBSD__)
2168 #ifdef _KERNEL
2169 char *oldname, *newname;
2170 #endif
2171 #endif
2172 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg;
2173 dsl_dataset_t *ds;
2174 uint64_t val;
2175 dmu_tx_t *tx = ddrsa->ddrsa_tx;
2176 int error;
2177
2178 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val);
2179 ASSERT(error == 0 || error == ENOENT);
2180 if (error == ENOENT) {
2181 /* ignore nonexistent snapshots */
2182 return (0);
2183 }
2184
2185 VERIFY0(dsl_dataset_hold_obj(dp, val, FTAG, &ds));
2186
2187 /* log before we change the name */
2188 spa_history_log_internal_ds(ds, "rename", tx,
2189 "-> @%s", ddrsa->ddrsa_newsnapname);
2190
2191 VERIFY0(dsl_dataset_snap_remove(hds, ddrsa->ddrsa_oldsnapname, tx,
2192 B_FALSE));
2193 mutex_enter(&ds->ds_lock);
2194 (void) strcpy(ds->ds_snapname, ddrsa->ddrsa_newsnapname);
2195 mutex_exit(&ds->ds_lock);
2196 VERIFY0(zap_add(dp->dp_meta_objset,
2197 dsl_dataset_phys(hds)->ds_snapnames_zapobj,
2198 ds->ds_snapname, 8, 1, &ds->ds_object, tx));
2199
2200 #if defined(__FreeBSD__) || defined(__NetBSD__)
2201 #ifdef _KERNEL
2202 oldname = kmem_alloc(MAXPATHLEN, KM_SLEEP);
2203 newname = kmem_alloc(MAXPATHLEN, KM_SLEEP);
2204 snprintf(oldname, MAXPATHLEN, "%s@%s", ddrsa->ddrsa_fsname,
2205 ddrsa->ddrsa_oldsnapname);
2206 snprintf(newname, MAXPATHLEN, "%s@%s", ddrsa->ddrsa_fsname,
2207 ddrsa->ddrsa_newsnapname);
2208 zfsvfs_update_fromname(oldname, newname);
2209 zvol_rename_minors(oldname, newname);
2210 kmem_free(newname, MAXPATHLEN);
2211 kmem_free(oldname, MAXPATHLEN);
2212 #endif
2213 #endif
2214 dsl_dataset_rele(ds, FTAG);
2215
2216 return (0);
2217 }
2218
2219 static void
dsl_dataset_rename_snapshot_sync(void * arg,dmu_tx_t * tx)2220 dsl_dataset_rename_snapshot_sync(void *arg, dmu_tx_t *tx)
2221 {
2222 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg;
2223 dsl_pool_t *dp = dmu_tx_pool(tx);
2224 dsl_dataset_t *hds;
2225
2226 VERIFY0(dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds));
2227 ddrsa->ddrsa_tx = tx;
2228 if (ddrsa->ddrsa_recursive) {
2229 VERIFY0(dmu_objset_find_dp(dp, hds->ds_dir->dd_object,
2230 dsl_dataset_rename_snapshot_sync_impl, ddrsa,
2231 DS_FIND_CHILDREN));
2232 } else {
2233 VERIFY0(dsl_dataset_rename_snapshot_sync_impl(dp, hds, ddrsa));
2234 }
2235 dsl_dataset_rele(hds, FTAG);
2236 }
2237
2238 int
dsl_dataset_rename_snapshot(const char * fsname,const char * oldsnapname,const char * newsnapname,boolean_t recursive)2239 dsl_dataset_rename_snapshot(const char *fsname,
2240 const char *oldsnapname, const char *newsnapname, boolean_t recursive)
2241 {
2242 dsl_dataset_rename_snapshot_arg_t ddrsa;
2243
2244 ddrsa.ddrsa_fsname = fsname;
2245 ddrsa.ddrsa_oldsnapname = oldsnapname;
2246 ddrsa.ddrsa_newsnapname = newsnapname;
2247 ddrsa.ddrsa_recursive = recursive;
2248
2249 return (dsl_sync_task(fsname, dsl_dataset_rename_snapshot_check,
2250 dsl_dataset_rename_snapshot_sync, &ddrsa,
2251 1, ZFS_SPACE_CHECK_RESERVED));
2252 }
2253
2254 /*
2255 * If we're doing an ownership handoff, we need to make sure that there is
2256 * only one long hold on the dataset. We're not allowed to change anything here
2257 * so we don't permanently release the long hold or regular hold here. We want
2258 * to do this only when syncing to avoid the dataset unexpectedly going away
2259 * when we release the long hold.
2260 */
2261 static int
dsl_dataset_handoff_check(dsl_dataset_t * ds,void * owner,dmu_tx_t * tx)2262 dsl_dataset_handoff_check(dsl_dataset_t *ds, void *owner, dmu_tx_t *tx)
2263 {
2264 boolean_t held;
2265
2266 if (!dmu_tx_is_syncing(tx))
2267 return (0);
2268
2269 if (owner != NULL) {
2270 VERIFY3P(ds->ds_owner, ==, owner);
2271 dsl_dataset_long_rele(ds, owner);
2272 }
2273
2274 held = dsl_dataset_long_held(ds);
2275
2276 if (owner != NULL)
2277 dsl_dataset_long_hold(ds, owner);
2278
2279 if (held)
2280 return (SET_ERROR(EBUSY));
2281
2282 return (0);
2283 }
2284
2285 typedef struct dsl_dataset_rollback_arg {
2286 const char *ddra_fsname;
2287 void *ddra_owner;
2288 nvlist_t *ddra_result;
2289 } dsl_dataset_rollback_arg_t;
2290
2291 static int
dsl_dataset_rollback_check(void * arg,dmu_tx_t * tx)2292 dsl_dataset_rollback_check(void *arg, dmu_tx_t *tx)
2293 {
2294 dsl_dataset_rollback_arg_t *ddra = arg;
2295 dsl_pool_t *dp = dmu_tx_pool(tx);
2296 dsl_dataset_t *ds;
2297 int64_t unused_refres_delta;
2298 int error;
2299
2300 error = dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds);
2301 if (error != 0)
2302 return (error);
2303
2304 /* must not be a snapshot */
2305 if (ds->ds_is_snapshot) {
2306 dsl_dataset_rele(ds, FTAG);
2307 return (SET_ERROR(EINVAL));
2308 }
2309
2310 /* must have a most recent snapshot */
2311 if (dsl_dataset_phys(ds)->ds_prev_snap_txg < TXG_INITIAL) {
2312 dsl_dataset_rele(ds, FTAG);
2313 return (SET_ERROR(EINVAL));
2314 }
2315
2316 /*
2317 * No rollback to a snapshot created in the current txg, because
2318 * the rollback may dirty the dataset and create blocks that are
2319 * not reachable from the rootbp while having a birth txg that
2320 * falls into the snapshot's range.
2321 */
2322 if (dmu_tx_is_syncing(tx) &&
2323 dsl_dataset_phys(ds)->ds_prev_snap_txg >= tx->tx_txg) {
2324 dsl_dataset_rele(ds, FTAG);
2325 return (SET_ERROR(EAGAIN));
2326 }
2327
2328 /* must not have any bookmarks after the most recent snapshot */
2329 nvlist_t *proprequest = fnvlist_alloc();
2330 fnvlist_add_boolean(proprequest, zfs_prop_to_name(ZFS_PROP_CREATETXG));
2331 nvlist_t *bookmarks = fnvlist_alloc();
2332 error = dsl_get_bookmarks_impl(ds, proprequest, bookmarks);
2333 fnvlist_free(proprequest);
2334 if (error != 0)
2335 return (error);
2336 for (nvpair_t *pair = nvlist_next_nvpair(bookmarks, NULL);
2337 pair != NULL; pair = nvlist_next_nvpair(bookmarks, pair)) {
2338 nvlist_t *valuenv =
2339 fnvlist_lookup_nvlist(fnvpair_value_nvlist(pair),
2340 zfs_prop_to_name(ZFS_PROP_CREATETXG));
2341 uint64_t createtxg = fnvlist_lookup_uint64(valuenv, "value");
2342 if (createtxg > dsl_dataset_phys(ds)->ds_prev_snap_txg) {
2343 fnvlist_free(bookmarks);
2344 dsl_dataset_rele(ds, FTAG);
2345 return (SET_ERROR(EEXIST));
2346 }
2347 }
2348 fnvlist_free(bookmarks);
2349
2350 error = dsl_dataset_handoff_check(ds, ddra->ddra_owner, tx);
2351 if (error != 0) {
2352 dsl_dataset_rele(ds, FTAG);
2353 return (error);
2354 }
2355
2356 /*
2357 * Check if the snap we are rolling back to uses more than
2358 * the refquota.
2359 */
2360 if (ds->ds_quota != 0 &&
2361 dsl_dataset_phys(ds->ds_prev)->ds_referenced_bytes > ds->ds_quota) {
2362 dsl_dataset_rele(ds, FTAG);
2363 return (SET_ERROR(EDQUOT));
2364 }
2365
2366 /*
2367 * When we do the clone swap, we will temporarily use more space
2368 * due to the refreservation (the head will no longer have any
2369 * unique space, so the entire amount of the refreservation will need
2370 * to be free). We will immediately destroy the clone, freeing
2371 * this space, but the freeing happens over many txg's.
2372 */
2373 unused_refres_delta = (int64_t)MIN(ds->ds_reserved,
2374 dsl_dataset_phys(ds)->ds_unique_bytes);
2375
2376 if (unused_refres_delta > 0 &&
2377 unused_refres_delta >
2378 dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE)) {
2379 dsl_dataset_rele(ds, FTAG);
2380 return (SET_ERROR(ENOSPC));
2381 }
2382
2383 dsl_dataset_rele(ds, FTAG);
2384 return (0);
2385 }
2386
2387 static void
dsl_dataset_rollback_sync(void * arg,dmu_tx_t * tx)2388 dsl_dataset_rollback_sync(void *arg, dmu_tx_t *tx)
2389 {
2390 dsl_dataset_rollback_arg_t *ddra = arg;
2391 dsl_pool_t *dp = dmu_tx_pool(tx);
2392 dsl_dataset_t *ds, *clone;
2393 uint64_t cloneobj;
2394 char namebuf[ZFS_MAX_DATASET_NAME_LEN];
2395
2396 VERIFY0(dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds));
2397
2398 dsl_dataset_name(ds->ds_prev, namebuf);
2399 fnvlist_add_string(ddra->ddra_result, "target", namebuf);
2400
2401 cloneobj = dsl_dataset_create_sync(ds->ds_dir, "%rollback",
2402 ds->ds_prev, DS_CREATE_FLAG_NODIRTY, kcred, tx);
2403
2404 VERIFY0(dsl_dataset_hold_obj(dp, cloneobj, FTAG, &clone));
2405
2406 dsl_dataset_clone_swap_sync_impl(clone, ds, tx);
2407 dsl_dataset_zero_zil(ds, tx);
2408
2409 dsl_destroy_head_sync_impl(clone, tx);
2410
2411 dsl_dataset_rele(clone, FTAG);
2412 dsl_dataset_rele(ds, FTAG);
2413 }
2414
2415 /*
2416 * Rolls back the given filesystem or volume to the most recent snapshot.
2417 * The name of the most recent snapshot will be returned under key "target"
2418 * in the result nvlist.
2419 *
2420 * If owner != NULL:
2421 * - The existing dataset MUST be owned by the specified owner at entry
2422 * - Upon return, dataset will still be held by the same owner, whether we
2423 * succeed or not.
2424 *
2425 * This mode is required any time the existing filesystem is mounted. See
2426 * notes above zfs_suspend_fs() for further details.
2427 */
2428 int
dsl_dataset_rollback(const char * fsname,void * owner,nvlist_t * result)2429 dsl_dataset_rollback(const char *fsname, void *owner, nvlist_t *result)
2430 {
2431 dsl_dataset_rollback_arg_t ddra;
2432
2433 ddra.ddra_fsname = fsname;
2434 ddra.ddra_owner = owner;
2435 ddra.ddra_result = result;
2436
2437 return (dsl_sync_task(fsname, dsl_dataset_rollback_check,
2438 dsl_dataset_rollback_sync, &ddra,
2439 1, ZFS_SPACE_CHECK_RESERVED));
2440 }
2441
2442 struct promotenode {
2443 list_node_t link;
2444 dsl_dataset_t *ds;
2445 };
2446
2447 typedef struct dsl_dataset_promote_arg {
2448 const char *ddpa_clonename;
2449 dsl_dataset_t *ddpa_clone;
2450 list_t shared_snaps, origin_snaps, clone_snaps;
2451 dsl_dataset_t *origin_origin; /* origin of the origin */
2452 uint64_t used, comp, uncomp, unique, cloneusedsnap, originusedsnap;
2453 char *err_ds;
2454 cred_t *cr;
2455 } dsl_dataset_promote_arg_t;
2456
2457 static int snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep);
2458 static int promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp,
2459 void *tag);
2460 static void promote_rele(dsl_dataset_promote_arg_t *ddpa, void *tag);
2461
2462 static int
dsl_dataset_promote_check(void * arg,dmu_tx_t * tx)2463 dsl_dataset_promote_check(void *arg, dmu_tx_t *tx)
2464 {
2465 dsl_dataset_promote_arg_t *ddpa = arg;
2466 dsl_pool_t *dp = dmu_tx_pool(tx);
2467 dsl_dataset_t *hds;
2468 struct promotenode *snap;
2469 dsl_dataset_t *origin_ds;
2470 int err;
2471 uint64_t unused;
2472 uint64_t ss_mv_cnt;
2473 size_t max_snap_len;
2474
2475 err = promote_hold(ddpa, dp, FTAG);
2476 if (err != 0)
2477 return (err);
2478
2479 hds = ddpa->ddpa_clone;
2480 max_snap_len = MAXNAMELEN - strlen(ddpa->ddpa_clonename) - 1;
2481
2482 if (dsl_dataset_phys(hds)->ds_flags & DS_FLAG_NOPROMOTE) {
2483 promote_rele(ddpa, FTAG);
2484 return (SET_ERROR(EXDEV));
2485 }
2486
2487 /*
2488 * Compute and check the amount of space to transfer. Since this is
2489 * so expensive, don't do the preliminary check.
2490 */
2491 if (!dmu_tx_is_syncing(tx)) {
2492 promote_rele(ddpa, FTAG);
2493 return (0);
2494 }
2495
2496 snap = list_head(&ddpa->shared_snaps);
2497 origin_ds = snap->ds;
2498
2499 /* compute origin's new unique space */
2500 snap = list_tail(&ddpa->clone_snaps);
2501 ASSERT3U(dsl_dataset_phys(snap->ds)->ds_prev_snap_obj, ==,
2502 origin_ds->ds_object);
2503 dsl_deadlist_space_range(&snap->ds->ds_deadlist,
2504 dsl_dataset_phys(origin_ds)->ds_prev_snap_txg, UINT64_MAX,
2505 &ddpa->unique, &unused, &unused);
2506
2507 /*
2508 * Walk the snapshots that we are moving
2509 *
2510 * Compute space to transfer. Consider the incremental changes
2511 * to used by each snapshot:
2512 * (my used) = (prev's used) + (blocks born) - (blocks killed)
2513 * So each snapshot gave birth to:
2514 * (blocks born) = (my used) - (prev's used) + (blocks killed)
2515 * So a sequence would look like:
2516 * (uN - u(N-1) + kN) + ... + (u1 - u0 + k1) + (u0 - 0 + k0)
2517 * Which simplifies to:
2518 * uN + kN + kN-1 + ... + k1 + k0
2519 * Note however, if we stop before we reach the ORIGIN we get:
2520 * uN + kN + kN-1 + ... + kM - uM-1
2521 */
2522 ss_mv_cnt = 0;
2523 ddpa->used = dsl_dataset_phys(origin_ds)->ds_referenced_bytes;
2524 ddpa->comp = dsl_dataset_phys(origin_ds)->ds_compressed_bytes;
2525 ddpa->uncomp = dsl_dataset_phys(origin_ds)->ds_uncompressed_bytes;
2526 for (snap = list_head(&ddpa->shared_snaps); snap;
2527 snap = list_next(&ddpa->shared_snaps, snap)) {
2528 uint64_t val, dlused, dlcomp, dluncomp;
2529 dsl_dataset_t *ds = snap->ds;
2530
2531 ss_mv_cnt++;
2532
2533 /*
2534 * If there are long holds, we won't be able to evict
2535 * the objset.
2536 */
2537 if (dsl_dataset_long_held(ds)) {
2538 err = SET_ERROR(EBUSY);
2539 goto out;
2540 }
2541
2542 /* Check that the snapshot name does not conflict */
2543 VERIFY0(dsl_dataset_get_snapname(ds));
2544 if (strlen(ds->ds_snapname) >= max_snap_len) {
2545 err = SET_ERROR(ENAMETOOLONG);
2546 goto out;
2547 }
2548 err = dsl_dataset_snap_lookup(hds, ds->ds_snapname, &val);
2549 if (err == 0) {
2550 (void) strcpy(ddpa->err_ds, snap->ds->ds_snapname);
2551 err = SET_ERROR(EEXIST);
2552 goto out;
2553 }
2554 if (err != ENOENT)
2555 goto out;
2556
2557 /* The very first snapshot does not have a deadlist */
2558 if (dsl_dataset_phys(ds)->ds_prev_snap_obj == 0)
2559 continue;
2560
2561 dsl_deadlist_space(&ds->ds_deadlist,
2562 &dlused, &dlcomp, &dluncomp);
2563 ddpa->used += dlused;
2564 ddpa->comp += dlcomp;
2565 ddpa->uncomp += dluncomp;
2566 }
2567
2568 /*
2569 * If we are a clone of a clone then we never reached ORIGIN,
2570 * so we need to subtract out the clone origin's used space.
2571 */
2572 if (ddpa->origin_origin) {
2573 ddpa->used -=
2574 dsl_dataset_phys(ddpa->origin_origin)->ds_referenced_bytes;
2575 ddpa->comp -=
2576 dsl_dataset_phys(ddpa->origin_origin)->ds_compressed_bytes;
2577 ddpa->uncomp -=
2578 dsl_dataset_phys(ddpa->origin_origin)->
2579 ds_uncompressed_bytes;
2580 }
2581
2582 /* Check that there is enough space and limit headroom here */
2583 err = dsl_dir_transfer_possible(origin_ds->ds_dir, hds->ds_dir,
2584 0, ss_mv_cnt, ddpa->used, ddpa->cr);
2585 if (err != 0)
2586 goto out;
2587
2588 /*
2589 * Compute the amounts of space that will be used by snapshots
2590 * after the promotion (for both origin and clone). For each,
2591 * it is the amount of space that will be on all of their
2592 * deadlists (that was not born before their new origin).
2593 */
2594 if (dsl_dir_phys(hds->ds_dir)->dd_flags & DD_FLAG_USED_BREAKDOWN) {
2595 uint64_t space;
2596
2597 /*
2598 * Note, typically this will not be a clone of a clone,
2599 * so dd_origin_txg will be < TXG_INITIAL, so
2600 * these snaplist_space() -> dsl_deadlist_space_range()
2601 * calls will be fast because they do not have to
2602 * iterate over all bps.
2603 */
2604 snap = list_head(&ddpa->origin_snaps);
2605 err = snaplist_space(&ddpa->shared_snaps,
2606 snap->ds->ds_dir->dd_origin_txg, &ddpa->cloneusedsnap);
2607 if (err != 0)
2608 goto out;
2609
2610 err = snaplist_space(&ddpa->clone_snaps,
2611 snap->ds->ds_dir->dd_origin_txg, &space);
2612 if (err != 0)
2613 goto out;
2614 ddpa->cloneusedsnap += space;
2615 }
2616 if (dsl_dir_phys(origin_ds->ds_dir)->dd_flags &
2617 DD_FLAG_USED_BREAKDOWN) {
2618 err = snaplist_space(&ddpa->origin_snaps,
2619 dsl_dataset_phys(origin_ds)->ds_creation_txg,
2620 &ddpa->originusedsnap);
2621 if (err != 0)
2622 goto out;
2623 }
2624
2625 out:
2626 promote_rele(ddpa, FTAG);
2627 return (err);
2628 }
2629
2630 static void
dsl_dataset_promote_sync(void * arg,dmu_tx_t * tx)2631 dsl_dataset_promote_sync(void *arg, dmu_tx_t *tx)
2632 {
2633 dsl_dataset_promote_arg_t *ddpa = arg;
2634 dsl_pool_t *dp = dmu_tx_pool(tx);
2635 dsl_dataset_t *hds;
2636 struct promotenode *snap;
2637 dsl_dataset_t *origin_ds;
2638 dsl_dataset_t *origin_head;
2639 dsl_dir_t *dd;
2640 dsl_dir_t *odd = NULL;
2641 uint64_t oldnext_obj;
2642 int64_t delta;
2643 #if (defined(__FreeBSD__) || defined(__NetBSD__)) && defined(_KERNEL)
2644 char *oldname, *newname;
2645 #endif
2646
2647 VERIFY0(promote_hold(ddpa, dp, FTAG));
2648 hds = ddpa->ddpa_clone;
2649
2650 ASSERT0(dsl_dataset_phys(hds)->ds_flags & DS_FLAG_NOPROMOTE);
2651
2652 snap = list_head(&ddpa->shared_snaps);
2653 origin_ds = snap->ds;
2654 dd = hds->ds_dir;
2655
2656 snap = list_head(&ddpa->origin_snaps);
2657 origin_head = snap->ds;
2658
2659 /*
2660 * We need to explicitly open odd, since origin_ds's dd will be
2661 * changing.
2662 */
2663 VERIFY0(dsl_dir_hold_obj(dp, origin_ds->ds_dir->dd_object,
2664 NULL, FTAG, &odd));
2665
2666 /* change origin's next snap */
2667 dmu_buf_will_dirty(origin_ds->ds_dbuf, tx);
2668 oldnext_obj = dsl_dataset_phys(origin_ds)->ds_next_snap_obj;
2669 snap = list_tail(&ddpa->clone_snaps);
2670 ASSERT3U(dsl_dataset_phys(snap->ds)->ds_prev_snap_obj, ==,
2671 origin_ds->ds_object);
2672 dsl_dataset_phys(origin_ds)->ds_next_snap_obj = snap->ds->ds_object;
2673
2674 /* change the origin's next clone */
2675 if (dsl_dataset_phys(origin_ds)->ds_next_clones_obj) {
2676 dsl_dataset_remove_from_next_clones(origin_ds,
2677 snap->ds->ds_object, tx);
2678 VERIFY0(zap_add_int(dp->dp_meta_objset,
2679 dsl_dataset_phys(origin_ds)->ds_next_clones_obj,
2680 oldnext_obj, tx));
2681 }
2682
2683 /* change origin */
2684 dmu_buf_will_dirty(dd->dd_dbuf, tx);
2685 ASSERT3U(dsl_dir_phys(dd)->dd_origin_obj, ==, origin_ds->ds_object);
2686 dsl_dir_phys(dd)->dd_origin_obj = dsl_dir_phys(odd)->dd_origin_obj;
2687 dd->dd_origin_txg = origin_head->ds_dir->dd_origin_txg;
2688 dmu_buf_will_dirty(odd->dd_dbuf, tx);
2689 dsl_dir_phys(odd)->dd_origin_obj = origin_ds->ds_object;
2690 origin_head->ds_dir->dd_origin_txg =
2691 dsl_dataset_phys(origin_ds)->ds_creation_txg;
2692
2693 /* change dd_clone entries */
2694 if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) {
2695 VERIFY0(zap_remove_int(dp->dp_meta_objset,
2696 dsl_dir_phys(odd)->dd_clones, hds->ds_object, tx));
2697 VERIFY0(zap_add_int(dp->dp_meta_objset,
2698 dsl_dir_phys(ddpa->origin_origin->ds_dir)->dd_clones,
2699 hds->ds_object, tx));
2700
2701 VERIFY0(zap_remove_int(dp->dp_meta_objset,
2702 dsl_dir_phys(ddpa->origin_origin->ds_dir)->dd_clones,
2703 origin_head->ds_object, tx));
2704 if (dsl_dir_phys(dd)->dd_clones == 0) {
2705 dsl_dir_phys(dd)->dd_clones =
2706 zap_create(dp->dp_meta_objset, DMU_OT_DSL_CLONES,
2707 DMU_OT_NONE, 0, tx);
2708 }
2709 VERIFY0(zap_add_int(dp->dp_meta_objset,
2710 dsl_dir_phys(dd)->dd_clones, origin_head->ds_object, tx));
2711 }
2712
2713 #if (defined(__FreeBSD__) || defined(__NetBSD__)) && defined(_KERNEL)
2714 /* Take the spa_namespace_lock early so zvol renames don't deadlock. */
2715 mutex_enter(&spa_namespace_lock);
2716
2717 oldname = kmem_alloc(MAXPATHLEN, KM_SLEEP);
2718 newname = kmem_alloc(MAXPATHLEN, KM_SLEEP);
2719 #endif
2720
2721 /* move snapshots to this dir */
2722 for (snap = list_head(&ddpa->shared_snaps); snap;
2723 snap = list_next(&ddpa->shared_snaps, snap)) {
2724 dsl_dataset_t *ds = snap->ds;
2725
2726 /*
2727 * Property callbacks are registered to a particular
2728 * dsl_dir. Since ours is changing, evict the objset
2729 * so that they will be unregistered from the old dsl_dir.
2730 */
2731 if (ds->ds_objset) {
2732 dmu_objset_evict(ds->ds_objset);
2733 ds->ds_objset = NULL;
2734 }
2735
2736 /* move snap name entry */
2737 VERIFY0(dsl_dataset_get_snapname(ds));
2738 VERIFY0(dsl_dataset_snap_remove(origin_head,
2739 ds->ds_snapname, tx, B_TRUE));
2740 VERIFY0(zap_add(dp->dp_meta_objset,
2741 dsl_dataset_phys(hds)->ds_snapnames_zapobj, ds->ds_snapname,
2742 8, 1, &ds->ds_object, tx));
2743 dsl_fs_ss_count_adjust(hds->ds_dir, 1,
2744 DD_FIELD_SNAPSHOT_COUNT, tx);
2745
2746 /* change containing dsl_dir */
2747 dmu_buf_will_dirty(ds->ds_dbuf, tx);
2748 ASSERT3U(dsl_dataset_phys(ds)->ds_dir_obj, ==, odd->dd_object);
2749 dsl_dataset_phys(ds)->ds_dir_obj = dd->dd_object;
2750 ASSERT3P(ds->ds_dir, ==, odd);
2751 dsl_dir_rele(ds->ds_dir, ds);
2752 VERIFY0(dsl_dir_hold_obj(dp, dd->dd_object,
2753 NULL, ds, &ds->ds_dir));
2754
2755 #if (defined(__FreeBSD__) || defined(__NetBSD__)) && defined(_KERNEL)
2756 dsl_dataset_name(ds, newname);
2757 zfsvfs_update_fromname(oldname, newname);
2758 zvol_rename_minors(oldname, newname);
2759 #endif
2760
2761 /* move any clone references */
2762 if (dsl_dataset_phys(ds)->ds_next_clones_obj &&
2763 spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) {
2764 zap_cursor_t zc;
2765 zap_attribute_t za;
2766
2767 for (zap_cursor_init(&zc, dp->dp_meta_objset,
2768 dsl_dataset_phys(ds)->ds_next_clones_obj);
2769 zap_cursor_retrieve(&zc, &za) == 0;
2770 zap_cursor_advance(&zc)) {
2771 dsl_dataset_t *cnds;
2772 uint64_t o;
2773
2774 if (za.za_first_integer == oldnext_obj) {
2775 /*
2776 * We've already moved the
2777 * origin's reference.
2778 */
2779 continue;
2780 }
2781
2782 VERIFY0(dsl_dataset_hold_obj(dp,
2783 za.za_first_integer, FTAG, &cnds));
2784 o = dsl_dir_phys(cnds->ds_dir)->
2785 dd_head_dataset_obj;
2786
2787 VERIFY0(zap_remove_int(dp->dp_meta_objset,
2788 dsl_dir_phys(odd)->dd_clones, o, tx));
2789 VERIFY0(zap_add_int(dp->dp_meta_objset,
2790 dsl_dir_phys(dd)->dd_clones, o, tx));
2791 dsl_dataset_rele(cnds, FTAG);
2792 }
2793 zap_cursor_fini(&zc);
2794 }
2795
2796 ASSERT(!dsl_prop_hascb(ds));
2797 }
2798
2799 #if (defined(__FreeBSD__) || defined(__NetBSD__)) && defined(_KERNEL)
2800 mutex_exit(&spa_namespace_lock);
2801
2802 kmem_free(newname, MAXPATHLEN);
2803 kmem_free(oldname, MAXPATHLEN);
2804 #endif
2805 /*
2806 * Change space accounting.
2807 * Note, pa->*usedsnap and dd_used_breakdown[SNAP] will either
2808 * both be valid, or both be 0 (resulting in delta == 0). This
2809 * is true for each of {clone,origin} independently.
2810 */
2811
2812 delta = ddpa->cloneusedsnap -
2813 dsl_dir_phys(dd)->dd_used_breakdown[DD_USED_SNAP];
2814 ASSERT3S(delta, >=, 0);
2815 ASSERT3U(ddpa->used, >=, delta);
2816 dsl_dir_diduse_space(dd, DD_USED_SNAP, delta, 0, 0, tx);
2817 dsl_dir_diduse_space(dd, DD_USED_HEAD,
2818 ddpa->used - delta, ddpa->comp, ddpa->uncomp, tx);
2819
2820 delta = ddpa->originusedsnap -
2821 dsl_dir_phys(odd)->dd_used_breakdown[DD_USED_SNAP];
2822 ASSERT3S(delta, <=, 0);
2823 ASSERT3U(ddpa->used, >=, -delta);
2824 dsl_dir_diduse_space(odd, DD_USED_SNAP, delta, 0, 0, tx);
2825 dsl_dir_diduse_space(odd, DD_USED_HEAD,
2826 -ddpa->used - delta, -ddpa->comp, -ddpa->uncomp, tx);
2827
2828 dsl_dataset_phys(origin_ds)->ds_unique_bytes = ddpa->unique;
2829
2830 /* log history record */
2831 spa_history_log_internal_ds(hds, "promote", tx, "");
2832
2833 dsl_dir_rele(odd, FTAG);
2834 promote_rele(ddpa, FTAG);
2835 }
2836
2837 /*
2838 * Make a list of dsl_dataset_t's for the snapshots between first_obj
2839 * (exclusive) and last_obj (inclusive). The list will be in reverse
2840 * order (last_obj will be the list_head()). If first_obj == 0, do all
2841 * snapshots back to this dataset's origin.
2842 */
2843 static int
snaplist_make(dsl_pool_t * dp,uint64_t first_obj,uint64_t last_obj,list_t * l,void * tag)2844 snaplist_make(dsl_pool_t *dp,
2845 uint64_t first_obj, uint64_t last_obj, list_t *l, void *tag)
2846 {
2847 uint64_t obj = last_obj;
2848
2849 list_create(l, sizeof (struct promotenode),
2850 offsetof(struct promotenode, link));
2851
2852 while (obj != first_obj) {
2853 dsl_dataset_t *ds;
2854 struct promotenode *snap;
2855 int err;
2856
2857 err = dsl_dataset_hold_obj(dp, obj, tag, &ds);
2858 ASSERT(err != ENOENT);
2859 if (err != 0)
2860 return (err);
2861
2862 if (first_obj == 0)
2863 first_obj = dsl_dir_phys(ds->ds_dir)->dd_origin_obj;
2864
2865 snap = kmem_alloc(sizeof (*snap), KM_SLEEP);
2866 snap->ds = ds;
2867 list_insert_tail(l, snap);
2868 obj = dsl_dataset_phys(ds)->ds_prev_snap_obj;
2869 }
2870
2871 return (0);
2872 }
2873
2874 static int
snaplist_space(list_t * l,uint64_t mintxg,uint64_t * spacep)2875 snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep)
2876 {
2877 struct promotenode *snap;
2878
2879 *spacep = 0;
2880 for (snap = list_head(l); snap; snap = list_next(l, snap)) {
2881 uint64_t used, comp, uncomp;
2882 dsl_deadlist_space_range(&snap->ds->ds_deadlist,
2883 mintxg, UINT64_MAX, &used, &comp, &uncomp);
2884 *spacep += used;
2885 }
2886 return (0);
2887 }
2888
2889 static void
snaplist_destroy(list_t * l,void * tag)2890 snaplist_destroy(list_t *l, void *tag)
2891 {
2892 struct promotenode *snap;
2893
2894 if (l == NULL || !list_link_active(&l->list_head))
2895 return;
2896
2897 while ((snap = list_tail(l)) != NULL) {
2898 list_remove(l, snap);
2899 dsl_dataset_rele(snap->ds, tag);
2900 kmem_free(snap, sizeof (*snap));
2901 }
2902 list_destroy(l);
2903 }
2904
2905 static int
promote_hold(dsl_dataset_promote_arg_t * ddpa,dsl_pool_t * dp,void * tag)2906 promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp, void *tag)
2907 {
2908 int error;
2909 dsl_dir_t *dd;
2910 struct promotenode *snap;
2911
2912 error = dsl_dataset_hold(dp, ddpa->ddpa_clonename, tag,
2913 &ddpa->ddpa_clone);
2914 if (error != 0)
2915 return (error);
2916 dd = ddpa->ddpa_clone->ds_dir;
2917
2918 if (ddpa->ddpa_clone->ds_is_snapshot ||
2919 !dsl_dir_is_clone(dd)) {
2920 dsl_dataset_rele(ddpa->ddpa_clone, tag);
2921 return (SET_ERROR(EINVAL));
2922 }
2923
2924 error = snaplist_make(dp, 0, dsl_dir_phys(dd)->dd_origin_obj,
2925 &ddpa->shared_snaps, tag);
2926 if (error != 0)
2927 goto out;
2928
2929 error = snaplist_make(dp, 0, ddpa->ddpa_clone->ds_object,
2930 &ddpa->clone_snaps, tag);
2931 if (error != 0)
2932 goto out;
2933
2934 snap = list_head(&ddpa->shared_snaps);
2935 ASSERT3U(snap->ds->ds_object, ==, dsl_dir_phys(dd)->dd_origin_obj);
2936 error = snaplist_make(dp, dsl_dir_phys(dd)->dd_origin_obj,
2937 dsl_dir_phys(snap->ds->ds_dir)->dd_head_dataset_obj,
2938 &ddpa->origin_snaps, tag);
2939 if (error != 0)
2940 goto out;
2941
2942 if (dsl_dir_phys(snap->ds->ds_dir)->dd_origin_obj != 0) {
2943 error = dsl_dataset_hold_obj(dp,
2944 dsl_dir_phys(snap->ds->ds_dir)->dd_origin_obj,
2945 tag, &ddpa->origin_origin);
2946 if (error != 0)
2947 goto out;
2948 }
2949 out:
2950 if (error != 0)
2951 promote_rele(ddpa, tag);
2952 return (error);
2953 }
2954
2955 static void
promote_rele(dsl_dataset_promote_arg_t * ddpa,void * tag)2956 promote_rele(dsl_dataset_promote_arg_t *ddpa, void *tag)
2957 {
2958 snaplist_destroy(&ddpa->shared_snaps, tag);
2959 snaplist_destroy(&ddpa->clone_snaps, tag);
2960 snaplist_destroy(&ddpa->origin_snaps, tag);
2961 if (ddpa->origin_origin != NULL)
2962 dsl_dataset_rele(ddpa->origin_origin, tag);
2963 dsl_dataset_rele(ddpa->ddpa_clone, tag);
2964 }
2965
2966 /*
2967 * Promote a clone.
2968 *
2969 * If it fails due to a conflicting snapshot name, "conflsnap" will be filled
2970 * in with the name. (It must be at least ZFS_MAX_DATASET_NAME_LEN bytes long.)
2971 */
2972 int
dsl_dataset_promote(const char * name,char * conflsnap)2973 dsl_dataset_promote(const char *name, char *conflsnap)
2974 {
2975 dsl_dataset_promote_arg_t ddpa = { 0 };
2976 uint64_t numsnaps;
2977 int error;
2978 objset_t *os;
2979
2980 /*
2981 * We will modify space proportional to the number of
2982 * snapshots. Compute numsnaps.
2983 */
2984 error = dmu_objset_hold(name, FTAG, &os);
2985 if (error != 0)
2986 return (error);
2987 error = zap_count(dmu_objset_pool(os)->dp_meta_objset,
2988 dsl_dataset_phys(dmu_objset_ds(os))->ds_snapnames_zapobj,
2989 &numsnaps);
2990 dmu_objset_rele(os, FTAG);
2991 if (error != 0)
2992 return (error);
2993
2994 ddpa.ddpa_clonename = name;
2995 ddpa.err_ds = conflsnap;
2996 ddpa.cr = CRED();
2997
2998 return (dsl_sync_task(name, dsl_dataset_promote_check,
2999 dsl_dataset_promote_sync, &ddpa,
3000 2 + numsnaps, ZFS_SPACE_CHECK_RESERVED));
3001 }
3002
3003 int
dsl_dataset_clone_swap_check_impl(dsl_dataset_t * clone,dsl_dataset_t * origin_head,boolean_t force,void * owner,dmu_tx_t * tx)3004 dsl_dataset_clone_swap_check_impl(dsl_dataset_t *clone,
3005 dsl_dataset_t *origin_head, boolean_t force, void *owner, dmu_tx_t *tx)
3006 {
3007 /*
3008 * "slack" factor for received datasets with refquota set on them.
3009 * See the bottom of this function for details on its use.
3010 */
3011 uint64_t refquota_slack = DMU_MAX_ACCESS * spa_asize_inflation;
3012 int64_t unused_refres_delta;
3013
3014 /* they should both be heads */
3015 if (clone->ds_is_snapshot ||
3016 origin_head->ds_is_snapshot)
3017 return (SET_ERROR(EINVAL));
3018
3019 /* if we are not forcing, the branch point should be just before them */
3020 if (!force && clone->ds_prev != origin_head->ds_prev)
3021 return (SET_ERROR(EINVAL));
3022
3023 /* clone should be the clone (unless they are unrelated) */
3024 if (clone->ds_prev != NULL &&
3025 clone->ds_prev != clone->ds_dir->dd_pool->dp_origin_snap &&
3026 origin_head->ds_dir != clone->ds_prev->ds_dir)
3027 return (SET_ERROR(EINVAL));
3028
3029 /* the clone should be a child of the origin */
3030 if (clone->ds_dir->dd_parent != origin_head->ds_dir)
3031 return (SET_ERROR(EINVAL));
3032
3033 /* origin_head shouldn't be modified unless 'force' */
3034 if (!force &&
3035 dsl_dataset_modified_since_snap(origin_head, origin_head->ds_prev))
3036 return (SET_ERROR(ETXTBSY));
3037
3038 /* origin_head should have no long holds (e.g. is not mounted) */
3039 if (dsl_dataset_handoff_check(origin_head, owner, tx))
3040 return (SET_ERROR(EBUSY));
3041
3042 /* check amount of any unconsumed refreservation */
3043 unused_refres_delta =
3044 (int64_t)MIN(origin_head->ds_reserved,
3045 dsl_dataset_phys(origin_head)->ds_unique_bytes) -
3046 (int64_t)MIN(origin_head->ds_reserved,
3047 dsl_dataset_phys(clone)->ds_unique_bytes);
3048
3049 if (unused_refres_delta > 0 &&
3050 unused_refres_delta >
3051 dsl_dir_space_available(origin_head->ds_dir, NULL, 0, TRUE))
3052 return (SET_ERROR(ENOSPC));
3053
3054 /*
3055 * The clone can't be too much over the head's refquota.
3056 *
3057 * To ensure that the entire refquota can be used, we allow one
3058 * transaction to exceed the the refquota. Therefore, this check
3059 * needs to also allow for the space referenced to be more than the
3060 * refquota. The maximum amount of space that one transaction can use
3061 * on disk is DMU_MAX_ACCESS * spa_asize_inflation. Allowing this
3062 * overage ensures that we are able to receive a filesystem that
3063 * exceeds the refquota on the source system.
3064 *
3065 * So that overage is the refquota_slack we use below.
3066 */
3067 if (origin_head->ds_quota != 0 &&
3068 dsl_dataset_phys(clone)->ds_referenced_bytes >
3069 origin_head->ds_quota + refquota_slack)
3070 return (SET_ERROR(EDQUOT));
3071
3072 return (0);
3073 }
3074
3075 void
dsl_dataset_clone_swap_sync_impl(dsl_dataset_t * clone,dsl_dataset_t * origin_head,dmu_tx_t * tx)3076 dsl_dataset_clone_swap_sync_impl(dsl_dataset_t *clone,
3077 dsl_dataset_t *origin_head, dmu_tx_t *tx)
3078 {
3079 dsl_pool_t *dp = dmu_tx_pool(tx);
3080 int64_t unused_refres_delta;
3081
3082 ASSERT(clone->ds_reserved == 0);
3083 /*
3084 * NOTE: On DEBUG kernels there could be a race between this and
3085 * the check function if spa_asize_inflation is adjusted...
3086 */
3087 ASSERT(origin_head->ds_quota == 0 ||
3088 dsl_dataset_phys(clone)->ds_unique_bytes <= origin_head->ds_quota +
3089 DMU_MAX_ACCESS * spa_asize_inflation);
3090 ASSERT3P(clone->ds_prev, ==, origin_head->ds_prev);
3091
3092 /*
3093 * Swap per-dataset feature flags.
3094 */
3095 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) {
3096 if (!(spa_feature_table[f].fi_flags &
3097 ZFEATURE_FLAG_PER_DATASET)) {
3098 ASSERT(!clone->ds_feature_inuse[f]);
3099 ASSERT(!origin_head->ds_feature_inuse[f]);
3100 continue;
3101 }
3102
3103 boolean_t clone_inuse = clone->ds_feature_inuse[f];
3104 boolean_t origin_head_inuse = origin_head->ds_feature_inuse[f];
3105
3106 if (clone_inuse) {
3107 dsl_dataset_deactivate_feature(clone->ds_object, f, tx);
3108 clone->ds_feature_inuse[f] = B_FALSE;
3109 }
3110 if (origin_head_inuse) {
3111 dsl_dataset_deactivate_feature(origin_head->ds_object,
3112 f, tx);
3113 origin_head->ds_feature_inuse[f] = B_FALSE;
3114 }
3115 if (clone_inuse) {
3116 dsl_dataset_activate_feature(origin_head->ds_object,
3117 f, tx);
3118 origin_head->ds_feature_inuse[f] = B_TRUE;
3119 }
3120 if (origin_head_inuse) {
3121 dsl_dataset_activate_feature(clone->ds_object, f, tx);
3122 clone->ds_feature_inuse[f] = B_TRUE;
3123 }
3124 }
3125
3126 dmu_buf_will_dirty(clone->ds_dbuf, tx);
3127 dmu_buf_will_dirty(origin_head->ds_dbuf, tx);
3128
3129 if (clone->ds_objset != NULL) {
3130 dmu_objset_evict(clone->ds_objset);
3131 clone->ds_objset = NULL;
3132 }
3133
3134 if (origin_head->ds_objset != NULL) {
3135 dmu_objset_evict(origin_head->ds_objset);
3136 origin_head->ds_objset = NULL;
3137 }
3138
3139 unused_refres_delta =
3140 (int64_t)MIN(origin_head->ds_reserved,
3141 dsl_dataset_phys(origin_head)->ds_unique_bytes) -
3142 (int64_t)MIN(origin_head->ds_reserved,
3143 dsl_dataset_phys(clone)->ds_unique_bytes);
3144
3145 /*
3146 * Reset origin's unique bytes, if it exists.
3147 */
3148 if (clone->ds_prev) {
3149 dsl_dataset_t *origin = clone->ds_prev;
3150 uint64_t comp, uncomp;
3151
3152 dmu_buf_will_dirty(origin->ds_dbuf, tx);
3153 dsl_deadlist_space_range(&clone->ds_deadlist,
3154 dsl_dataset_phys(origin)->ds_prev_snap_txg, UINT64_MAX,
3155 &dsl_dataset_phys(origin)->ds_unique_bytes, &comp, &uncomp);
3156 }
3157
3158 /* swap blkptrs */
3159 {
3160 rrw_enter(&clone->ds_bp_rwlock, RW_WRITER, FTAG);
3161 rrw_enter(&origin_head->ds_bp_rwlock, RW_WRITER, FTAG);
3162 blkptr_t tmp;
3163 tmp = dsl_dataset_phys(origin_head)->ds_bp;
3164 dsl_dataset_phys(origin_head)->ds_bp =
3165 dsl_dataset_phys(clone)->ds_bp;
3166 dsl_dataset_phys(clone)->ds_bp = tmp;
3167 rrw_exit(&origin_head->ds_bp_rwlock, FTAG);
3168 rrw_exit(&clone->ds_bp_rwlock, FTAG);
3169 }
3170
3171 /* set dd_*_bytes */
3172 {
3173 int64_t dused, dcomp, duncomp;
3174 uint64_t cdl_used, cdl_comp, cdl_uncomp;
3175 uint64_t odl_used, odl_comp, odl_uncomp;
3176
3177 ASSERT3U(dsl_dir_phys(clone->ds_dir)->
3178 dd_used_breakdown[DD_USED_SNAP], ==, 0);
3179
3180 dsl_deadlist_space(&clone->ds_deadlist,
3181 &cdl_used, &cdl_comp, &cdl_uncomp);
3182 dsl_deadlist_space(&origin_head->ds_deadlist,
3183 &odl_used, &odl_comp, &odl_uncomp);
3184
3185 dused = dsl_dataset_phys(clone)->ds_referenced_bytes +
3186 cdl_used -
3187 (dsl_dataset_phys(origin_head)->ds_referenced_bytes +
3188 odl_used);
3189 dcomp = dsl_dataset_phys(clone)->ds_compressed_bytes +
3190 cdl_comp -
3191 (dsl_dataset_phys(origin_head)->ds_compressed_bytes +
3192 odl_comp);
3193 duncomp = dsl_dataset_phys(clone)->ds_uncompressed_bytes +
3194 cdl_uncomp -
3195 (dsl_dataset_phys(origin_head)->ds_uncompressed_bytes +
3196 odl_uncomp);
3197
3198 dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_HEAD,
3199 dused, dcomp, duncomp, tx);
3200 dsl_dir_diduse_space(clone->ds_dir, DD_USED_HEAD,
3201 -dused, -dcomp, -duncomp, tx);
3202
3203 /*
3204 * The difference in the space used by snapshots is the
3205 * difference in snapshot space due to the head's
3206 * deadlist (since that's the only thing that's
3207 * changing that affects the snapused).
3208 */
3209 dsl_deadlist_space_range(&clone->ds_deadlist,
3210 origin_head->ds_dir->dd_origin_txg, UINT64_MAX,
3211 &cdl_used, &cdl_comp, &cdl_uncomp);
3212 dsl_deadlist_space_range(&origin_head->ds_deadlist,
3213 origin_head->ds_dir->dd_origin_txg, UINT64_MAX,
3214 &odl_used, &odl_comp, &odl_uncomp);
3215 dsl_dir_transfer_space(origin_head->ds_dir, cdl_used - odl_used,
3216 DD_USED_HEAD, DD_USED_SNAP, NULL);
3217 }
3218
3219 /* swap ds_*_bytes */
3220 SWITCH64(dsl_dataset_phys(origin_head)->ds_referenced_bytes,
3221 dsl_dataset_phys(clone)->ds_referenced_bytes);
3222 SWITCH64(dsl_dataset_phys(origin_head)->ds_compressed_bytes,
3223 dsl_dataset_phys(clone)->ds_compressed_bytes);
3224 SWITCH64(dsl_dataset_phys(origin_head)->ds_uncompressed_bytes,
3225 dsl_dataset_phys(clone)->ds_uncompressed_bytes);
3226 SWITCH64(dsl_dataset_phys(origin_head)->ds_unique_bytes,
3227 dsl_dataset_phys(clone)->ds_unique_bytes);
3228
3229 /* apply any parent delta for change in unconsumed refreservation */
3230 dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_REFRSRV,
3231 unused_refres_delta, 0, 0, tx);
3232
3233 /*
3234 * Swap deadlists.
3235 */
3236 dsl_deadlist_close(&clone->ds_deadlist);
3237 dsl_deadlist_close(&origin_head->ds_deadlist);
3238 SWITCH64(dsl_dataset_phys(origin_head)->ds_deadlist_obj,
3239 dsl_dataset_phys(clone)->ds_deadlist_obj);
3240 dsl_deadlist_open(&clone->ds_deadlist, dp->dp_meta_objset,
3241 dsl_dataset_phys(clone)->ds_deadlist_obj);
3242 dsl_deadlist_open(&origin_head->ds_deadlist, dp->dp_meta_objset,
3243 dsl_dataset_phys(origin_head)->ds_deadlist_obj);
3244
3245 dsl_scan_ds_clone_swapped(origin_head, clone, tx);
3246
3247 spa_history_log_internal_ds(clone, "clone swap", tx,
3248 "parent=%s", origin_head->ds_dir->dd_myname);
3249 }
3250
3251 /*
3252 * Given a pool name and a dataset object number in that pool,
3253 * return the name of that dataset.
3254 */
3255 int
dsl_dsobj_to_dsname(char * pname,uint64_t obj,char * buf)3256 dsl_dsobj_to_dsname(char *pname, uint64_t obj, char *buf)
3257 {
3258 dsl_pool_t *dp;
3259 dsl_dataset_t *ds;
3260 int error;
3261
3262 error = dsl_pool_hold(pname, FTAG, &dp);
3263 if (error != 0)
3264 return (error);
3265
3266 error = dsl_dataset_hold_obj(dp, obj, FTAG, &ds);
3267 if (error == 0) {
3268 dsl_dataset_name(ds, buf);
3269 dsl_dataset_rele(ds, FTAG);
3270 }
3271 dsl_pool_rele(dp, FTAG);
3272
3273 return (error);
3274 }
3275
3276 int
dsl_dataset_check_quota(dsl_dataset_t * ds,boolean_t check_quota,uint64_t asize,uint64_t inflight,uint64_t * used,uint64_t * ref_rsrv)3277 dsl_dataset_check_quota(dsl_dataset_t *ds, boolean_t check_quota,
3278 uint64_t asize, uint64_t inflight, uint64_t *used, uint64_t *ref_rsrv)
3279 {
3280 int error = 0;
3281
3282 ASSERT3S(asize, >, 0);
3283
3284 /*
3285 * *ref_rsrv is the portion of asize that will come from any
3286 * unconsumed refreservation space.
3287 */
3288 *ref_rsrv = 0;
3289
3290 mutex_enter(&ds->ds_lock);
3291 /*
3292 * Make a space adjustment for reserved bytes.
3293 */
3294 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes) {
3295 ASSERT3U(*used, >=,
3296 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes);
3297 *used -=
3298 (ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes);
3299 *ref_rsrv =
3300 asize - MIN(asize, parent_delta(ds, asize + inflight));
3301 }
3302
3303 if (!check_quota || ds->ds_quota == 0) {
3304 mutex_exit(&ds->ds_lock);
3305 return (0);
3306 }
3307 /*
3308 * If they are requesting more space, and our current estimate
3309 * is over quota, they get to try again unless the actual
3310 * on-disk is over quota and there are no pending changes (which
3311 * may free up space for us).
3312 */
3313 if (dsl_dataset_phys(ds)->ds_referenced_bytes + inflight >=
3314 ds->ds_quota) {
3315 if (inflight > 0 ||
3316 dsl_dataset_phys(ds)->ds_referenced_bytes < ds->ds_quota)
3317 error = SET_ERROR(ERESTART);
3318 else
3319 error = SET_ERROR(EDQUOT);
3320 }
3321 mutex_exit(&ds->ds_lock);
3322
3323 return (error);
3324 }
3325
3326 typedef struct dsl_dataset_set_qr_arg {
3327 const char *ddsqra_name;
3328 zprop_source_t ddsqra_source;
3329 uint64_t ddsqra_value;
3330 } dsl_dataset_set_qr_arg_t;
3331
3332
3333 /* ARGSUSED */
3334 static int
dsl_dataset_set_refquota_check(void * arg,dmu_tx_t * tx)3335 dsl_dataset_set_refquota_check(void *arg, dmu_tx_t *tx)
3336 {
3337 dsl_dataset_set_qr_arg_t *ddsqra = arg;
3338 dsl_pool_t *dp = dmu_tx_pool(tx);
3339 dsl_dataset_t *ds;
3340 int error;
3341 uint64_t newval;
3342
3343 if (spa_version(dp->dp_spa) < SPA_VERSION_REFQUOTA)
3344 return (SET_ERROR(ENOTSUP));
3345
3346 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds);
3347 if (error != 0)
3348 return (error);
3349
3350 if (ds->ds_is_snapshot) {
3351 dsl_dataset_rele(ds, FTAG);
3352 return (SET_ERROR(EINVAL));
3353 }
3354
3355 error = dsl_prop_predict(ds->ds_dir,
3356 zfs_prop_to_name(ZFS_PROP_REFQUOTA),
3357 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval);
3358 if (error != 0) {
3359 dsl_dataset_rele(ds, FTAG);
3360 return (error);
3361 }
3362
3363 if (newval == 0) {
3364 dsl_dataset_rele(ds, FTAG);
3365 return (0);
3366 }
3367
3368 if (newval < dsl_dataset_phys(ds)->ds_referenced_bytes ||
3369 newval < ds->ds_reserved) {
3370 dsl_dataset_rele(ds, FTAG);
3371 return (SET_ERROR(ENOSPC));
3372 }
3373
3374 dsl_dataset_rele(ds, FTAG);
3375 return (0);
3376 }
3377
3378 static void
dsl_dataset_set_refquota_sync(void * arg,dmu_tx_t * tx)3379 dsl_dataset_set_refquota_sync(void *arg, dmu_tx_t *tx)
3380 {
3381 dsl_dataset_set_qr_arg_t *ddsqra = arg;
3382 dsl_pool_t *dp = dmu_tx_pool(tx);
3383 dsl_dataset_t *ds;
3384 uint64_t newval;
3385
3386 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds));
3387
3388 dsl_prop_set_sync_impl(ds,
3389 zfs_prop_to_name(ZFS_PROP_REFQUOTA),
3390 ddsqra->ddsqra_source, sizeof (ddsqra->ddsqra_value), 1,
3391 &ddsqra->ddsqra_value, tx);
3392
3393 VERIFY0(dsl_prop_get_int_ds(ds,
3394 zfs_prop_to_name(ZFS_PROP_REFQUOTA), &newval));
3395
3396 if (ds->ds_quota != newval) {
3397 dmu_buf_will_dirty(ds->ds_dbuf, tx);
3398 ds->ds_quota = newval;
3399 }
3400 dsl_dataset_rele(ds, FTAG);
3401 }
3402
3403 int
dsl_dataset_set_refquota(const char * dsname,zprop_source_t source,uint64_t refquota)3404 dsl_dataset_set_refquota(const char *dsname, zprop_source_t source,
3405 uint64_t refquota)
3406 {
3407 dsl_dataset_set_qr_arg_t ddsqra;
3408
3409 ddsqra.ddsqra_name = dsname;
3410 ddsqra.ddsqra_source = source;
3411 ddsqra.ddsqra_value = refquota;
3412
3413 return (dsl_sync_task(dsname, dsl_dataset_set_refquota_check,
3414 dsl_dataset_set_refquota_sync, &ddsqra, 0, ZFS_SPACE_CHECK_NONE));
3415 }
3416
3417 static int
dsl_dataset_set_refreservation_check(void * arg,dmu_tx_t * tx)3418 dsl_dataset_set_refreservation_check(void *arg, dmu_tx_t *tx)
3419 {
3420 dsl_dataset_set_qr_arg_t *ddsqra = arg;
3421 dsl_pool_t *dp = dmu_tx_pool(tx);
3422 dsl_dataset_t *ds;
3423 int error;
3424 uint64_t newval, unique;
3425
3426 if (spa_version(dp->dp_spa) < SPA_VERSION_REFRESERVATION)
3427 return (SET_ERROR(ENOTSUP));
3428
3429 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds);
3430 if (error != 0)
3431 return (error);
3432
3433 if (ds->ds_is_snapshot) {
3434 dsl_dataset_rele(ds, FTAG);
3435 return (SET_ERROR(EINVAL));
3436 }
3437
3438 error = dsl_prop_predict(ds->ds_dir,
3439 zfs_prop_to_name(ZFS_PROP_REFRESERVATION),
3440 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval);
3441 if (error != 0) {
3442 dsl_dataset_rele(ds, FTAG);
3443 return (error);
3444 }
3445
3446 /*
3447 * If we are doing the preliminary check in open context, the
3448 * space estimates may be inaccurate.
3449 */
3450 if (!dmu_tx_is_syncing(tx)) {
3451 dsl_dataset_rele(ds, FTAG);
3452 return (0);
3453 }
3454
3455 mutex_enter(&ds->ds_lock);
3456 if (!DS_UNIQUE_IS_ACCURATE(ds))
3457 dsl_dataset_recalc_head_uniq(ds);
3458 unique = dsl_dataset_phys(ds)->ds_unique_bytes;
3459 mutex_exit(&ds->ds_lock);
3460
3461 if (MAX(unique, newval) > MAX(unique, ds->ds_reserved)) {
3462 uint64_t delta = MAX(unique, newval) -
3463 MAX(unique, ds->ds_reserved);
3464
3465 if (delta >
3466 dsl_dir_space_available(ds->ds_dir, NULL, 0, B_TRUE) ||
3467 (ds->ds_quota > 0 && newval > ds->ds_quota)) {
3468 dsl_dataset_rele(ds, FTAG);
3469 return (SET_ERROR(ENOSPC));
3470 }
3471 }
3472
3473 dsl_dataset_rele(ds, FTAG);
3474 return (0);
3475 }
3476
3477 void
dsl_dataset_set_refreservation_sync_impl(dsl_dataset_t * ds,zprop_source_t source,uint64_t value,dmu_tx_t * tx)3478 dsl_dataset_set_refreservation_sync_impl(dsl_dataset_t *ds,
3479 zprop_source_t source, uint64_t value, dmu_tx_t *tx)
3480 {
3481 uint64_t newval;
3482 uint64_t unique;
3483 int64_t delta;
3484
3485 dsl_prop_set_sync_impl(ds, zfs_prop_to_name(ZFS_PROP_REFRESERVATION),
3486 source, sizeof (value), 1, &value, tx);
3487
3488 VERIFY0(dsl_prop_get_int_ds(ds,
3489 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), &newval));
3490
3491 dmu_buf_will_dirty(ds->ds_dbuf, tx);
3492 mutex_enter(&ds->ds_dir->dd_lock);
3493 mutex_enter(&ds->ds_lock);
3494 ASSERT(DS_UNIQUE_IS_ACCURATE(ds));
3495 unique = dsl_dataset_phys(ds)->ds_unique_bytes;
3496 delta = MAX(0, (int64_t)(newval - unique)) -
3497 MAX(0, (int64_t)(ds->ds_reserved - unique));
3498 ds->ds_reserved = newval;
3499 mutex_exit(&ds->ds_lock);
3500
3501 dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV, delta, 0, 0, tx);
3502 mutex_exit(&ds->ds_dir->dd_lock);
3503 }
3504
3505 static void
dsl_dataset_set_refreservation_sync(void * arg,dmu_tx_t * tx)3506 dsl_dataset_set_refreservation_sync(void *arg, dmu_tx_t *tx)
3507 {
3508 dsl_dataset_set_qr_arg_t *ddsqra = arg;
3509 dsl_pool_t *dp = dmu_tx_pool(tx);
3510 dsl_dataset_t *ds;
3511
3512 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds));
3513 dsl_dataset_set_refreservation_sync_impl(ds,
3514 ddsqra->ddsqra_source, ddsqra->ddsqra_value, tx);
3515 dsl_dataset_rele(ds, FTAG);
3516 }
3517
3518 int
dsl_dataset_set_refreservation(const char * dsname,zprop_source_t source,uint64_t refreservation)3519 dsl_dataset_set_refreservation(const char *dsname, zprop_source_t source,
3520 uint64_t refreservation)
3521 {
3522 dsl_dataset_set_qr_arg_t ddsqra;
3523
3524 ddsqra.ddsqra_name = dsname;
3525 ddsqra.ddsqra_source = source;
3526 ddsqra.ddsqra_value = refreservation;
3527
3528 return (dsl_sync_task(dsname, dsl_dataset_set_refreservation_check,
3529 dsl_dataset_set_refreservation_sync, &ddsqra,
3530 0, ZFS_SPACE_CHECK_NONE));
3531 }
3532
3533 /*
3534 * Return (in *usedp) the amount of space written in new that is not
3535 * present in oldsnap. New may be a snapshot or the head. Old must be
3536 * a snapshot before new, in new's filesystem (or its origin). If not then
3537 * fail and return EINVAL.
3538 *
3539 * The written space is calculated by considering two components: First, we
3540 * ignore any freed space, and calculate the written as new's used space
3541 * minus old's used space. Next, we add in the amount of space that was freed
3542 * between the two snapshots, thus reducing new's used space relative to old's.
3543 * Specifically, this is the space that was born before old->ds_creation_txg,
3544 * and freed before new (ie. on new's deadlist or a previous deadlist).
3545 *
3546 * space freed [---------------------]
3547 * snapshots ---O-------O--------O-------O------
3548 * oldsnap new
3549 */
3550 int
dsl_dataset_space_written(dsl_dataset_t * oldsnap,dsl_dataset_t * new,uint64_t * usedp,uint64_t * compp,uint64_t * uncompp)3551 dsl_dataset_space_written(dsl_dataset_t *oldsnap, dsl_dataset_t *new,
3552 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp)
3553 {
3554 int err = 0;
3555 uint64_t snapobj;
3556 dsl_pool_t *dp = new->ds_dir->dd_pool;
3557
3558 ASSERT(dsl_pool_config_held(dp));
3559
3560 *usedp = 0;
3561 *usedp += dsl_dataset_phys(new)->ds_referenced_bytes;
3562 *usedp -= dsl_dataset_phys(oldsnap)->ds_referenced_bytes;
3563
3564 *compp = 0;
3565 *compp += dsl_dataset_phys(new)->ds_compressed_bytes;
3566 *compp -= dsl_dataset_phys(oldsnap)->ds_compressed_bytes;
3567
3568 *uncompp = 0;
3569 *uncompp += dsl_dataset_phys(new)->ds_uncompressed_bytes;
3570 *uncompp -= dsl_dataset_phys(oldsnap)->ds_uncompressed_bytes;
3571
3572 snapobj = new->ds_object;
3573 while (snapobj != oldsnap->ds_object) {
3574 dsl_dataset_t *snap;
3575 uint64_t used, comp, uncomp;
3576
3577 if (snapobj == new->ds_object) {
3578 snap = new;
3579 } else {
3580 err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &snap);
3581 if (err != 0)
3582 break;
3583 }
3584
3585 if (dsl_dataset_phys(snap)->ds_prev_snap_txg ==
3586 dsl_dataset_phys(oldsnap)->ds_creation_txg) {
3587 /*
3588 * The blocks in the deadlist can not be born after
3589 * ds_prev_snap_txg, so get the whole deadlist space,
3590 * which is more efficient (especially for old-format
3591 * deadlists). Unfortunately the deadlist code
3592 * doesn't have enough information to make this
3593 * optimization itself.
3594 */
3595 dsl_deadlist_space(&snap->ds_deadlist,
3596 &used, &comp, &uncomp);
3597 } else {
3598 dsl_deadlist_space_range(&snap->ds_deadlist,
3599 0, dsl_dataset_phys(oldsnap)->ds_creation_txg,
3600 &used, &comp, &uncomp);
3601 }
3602 *usedp += used;
3603 *compp += comp;
3604 *uncompp += uncomp;
3605
3606 /*
3607 * If we get to the beginning of the chain of snapshots
3608 * (ds_prev_snap_obj == 0) before oldsnap, then oldsnap
3609 * was not a snapshot of/before new.
3610 */
3611 snapobj = dsl_dataset_phys(snap)->ds_prev_snap_obj;
3612 if (snap != new)
3613 dsl_dataset_rele(snap, FTAG);
3614 if (snapobj == 0) {
3615 err = SET_ERROR(EINVAL);
3616 break;
3617 }
3618
3619 }
3620 return (err);
3621 }
3622
3623 /*
3624 * Return (in *usedp) the amount of space that will be reclaimed if firstsnap,
3625 * lastsnap, and all snapshots in between are deleted.
3626 *
3627 * blocks that would be freed [---------------------------]
3628 * snapshots ---O-------O--------O-------O--------O
3629 * firstsnap lastsnap
3630 *
3631 * This is the set of blocks that were born after the snap before firstsnap,
3632 * (birth > firstsnap->prev_snap_txg) and died before the snap after the
3633 * last snap (ie, is on lastsnap->ds_next->ds_deadlist or an earlier deadlist).
3634 * We calculate this by iterating over the relevant deadlists (from the snap
3635 * after lastsnap, backward to the snap after firstsnap), summing up the
3636 * space on the deadlist that was born after the snap before firstsnap.
3637 */
3638 int
dsl_dataset_space_wouldfree(dsl_dataset_t * firstsnap,dsl_dataset_t * lastsnap,uint64_t * usedp,uint64_t * compp,uint64_t * uncompp)3639 dsl_dataset_space_wouldfree(dsl_dataset_t *firstsnap,
3640 dsl_dataset_t *lastsnap,
3641 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp)
3642 {
3643 int err = 0;
3644 uint64_t snapobj;
3645 dsl_pool_t *dp = firstsnap->ds_dir->dd_pool;
3646
3647 ASSERT(firstsnap->ds_is_snapshot);
3648 ASSERT(lastsnap->ds_is_snapshot);
3649
3650 /*
3651 * Check that the snapshots are in the same dsl_dir, and firstsnap
3652 * is before lastsnap.
3653 */
3654 if (firstsnap->ds_dir != lastsnap->ds_dir ||
3655 dsl_dataset_phys(firstsnap)->ds_creation_txg >
3656 dsl_dataset_phys(lastsnap)->ds_creation_txg)
3657 return (SET_ERROR(EINVAL));
3658
3659 *usedp = *compp = *uncompp = 0;
3660
3661 snapobj = dsl_dataset_phys(lastsnap)->ds_next_snap_obj;
3662 while (snapobj != firstsnap->ds_object) {
3663 dsl_dataset_t *ds;
3664 uint64_t used, comp, uncomp;
3665
3666 err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &ds);
3667 if (err != 0)
3668 break;
3669
3670 dsl_deadlist_space_range(&ds->ds_deadlist,
3671 dsl_dataset_phys(firstsnap)->ds_prev_snap_txg, UINT64_MAX,
3672 &used, &comp, &uncomp);
3673 *usedp += used;
3674 *compp += comp;
3675 *uncompp += uncomp;
3676
3677 snapobj = dsl_dataset_phys(ds)->ds_prev_snap_obj;
3678 ASSERT3U(snapobj, !=, 0);
3679 dsl_dataset_rele(ds, FTAG);
3680 }
3681 return (err);
3682 }
3683
3684 /*
3685 * Return TRUE if 'earlier' is an earlier snapshot in 'later's timeline.
3686 * For example, they could both be snapshots of the same filesystem, and
3687 * 'earlier' is before 'later'. Or 'earlier' could be the origin of
3688 * 'later's filesystem. Or 'earlier' could be an older snapshot in the origin's
3689 * filesystem. Or 'earlier' could be the origin's origin.
3690 *
3691 * If non-zero, earlier_txg is used instead of earlier's ds_creation_txg.
3692 */
3693 boolean_t
dsl_dataset_is_before(dsl_dataset_t * later,dsl_dataset_t * earlier,uint64_t earlier_txg)3694 dsl_dataset_is_before(dsl_dataset_t *later, dsl_dataset_t *earlier,
3695 uint64_t earlier_txg)
3696 {
3697 dsl_pool_t *dp = later->ds_dir->dd_pool;
3698 int error;
3699 boolean_t ret;
3700
3701 ASSERT(dsl_pool_config_held(dp));
3702 ASSERT(earlier->ds_is_snapshot || earlier_txg != 0);
3703
3704 if (earlier_txg == 0)
3705 earlier_txg = dsl_dataset_phys(earlier)->ds_creation_txg;
3706
3707 if (later->ds_is_snapshot &&
3708 earlier_txg >= dsl_dataset_phys(later)->ds_creation_txg)
3709 return (B_FALSE);
3710
3711 if (later->ds_dir == earlier->ds_dir)
3712 return (B_TRUE);
3713 if (!dsl_dir_is_clone(later->ds_dir))
3714 return (B_FALSE);
3715
3716 if (dsl_dir_phys(later->ds_dir)->dd_origin_obj == earlier->ds_object)
3717 return (B_TRUE);
3718 dsl_dataset_t *origin;
3719 error = dsl_dataset_hold_obj(dp,
3720 dsl_dir_phys(later->ds_dir)->dd_origin_obj, FTAG, &origin);
3721 if (error != 0)
3722 return (B_FALSE);
3723 ret = dsl_dataset_is_before(origin, earlier, earlier_txg);
3724 dsl_dataset_rele(origin, FTAG);
3725 return (ret);
3726 }
3727
3728 void
dsl_dataset_zapify(dsl_dataset_t * ds,dmu_tx_t * tx)3729 dsl_dataset_zapify(dsl_dataset_t *ds, dmu_tx_t *tx)
3730 {
3731 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
3732 dmu_object_zapify(mos, ds->ds_object, DMU_OT_DSL_DATASET, tx);
3733 }
3734
3735 boolean_t
dsl_dataset_is_zapified(dsl_dataset_t * ds)3736 dsl_dataset_is_zapified(dsl_dataset_t *ds)
3737 {
3738 dmu_object_info_t doi;
3739
3740 dmu_object_info_from_db(ds->ds_dbuf, &doi);
3741 return (doi.doi_type == DMU_OTN_ZAP_METADATA);
3742 }
3743
3744 boolean_t
dsl_dataset_has_resume_receive_state(dsl_dataset_t * ds)3745 dsl_dataset_has_resume_receive_state(dsl_dataset_t *ds)
3746 {
3747 return (dsl_dataset_is_zapified(ds) &&
3748 zap_contains(ds->ds_dir->dd_pool->dp_meta_objset,
3749 ds->ds_object, DS_FIELD_RESUME_TOGUID) == 0);
3750 }
3751