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1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21 /*
22 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
23 * Copyright (c) 2011, 2015 by Delphix. All rights reserved.
24 * Copyright (c) 2014, Joyent, Inc. All rights reserved.
25 * Copyright (c) 2014 RackTop Systems.
26 * Copyright (c) 2014 Spectra Logic Corporation, All rights reserved.
27 * Copyright (c) 2016 Actifio, Inc. All rights reserved.
28 */
29
30 #include <sys/dmu_objset.h>
31 #include <sys/dsl_dataset.h>
32 #include <sys/dsl_dir.h>
33 #include <sys/dsl_prop.h>
34 #include <sys/dsl_synctask.h>
35 #include <sys/dmu_traverse.h>
36 #include <sys/dmu_impl.h>
37 #include <sys/dmu_tx.h>
38 #include <sys/arc.h>
39 #include <sys/zio.h>
40 #include <sys/zap.h>
41 #include <sys/zfeature.h>
42 #include <sys/unique.h>
43 #include <sys/zfs_context.h>
44 #include <sys/zfs_ioctl.h>
45 #include <sys/spa.h>
46 #include <sys/zfs_znode.h>
47 #include <sys/zfs_onexit.h>
48 #include <sys/zvol.h>
49 #include <sys/dsl_scan.h>
50 #include <sys/dsl_deadlist.h>
51 #include <sys/dsl_destroy.h>
52 #include <sys/dsl_userhold.h>
53 #include <sys/dsl_bookmark.h>
54 #include <sys/policy.h>
55 #include <sys/dmu_send.h>
56 #include <sys/zio_compress.h>
57 #include <zfs_fletcher.h>
58
59 /*
60 * The SPA supports block sizes up to 16MB. However, very large blocks
61 * can have an impact on i/o latency (e.g. tying up a spinning disk for
62 * ~300ms), and also potentially on the memory allocator. Therefore,
63 * we do not allow the recordsize to be set larger than zfs_max_recordsize
64 * (default 1MB). Larger blocks can be created by changing this tunable,
65 * and pools with larger blocks can always be imported and used, regardless
66 * of this setting.
67 */
68 int zfs_max_recordsize = 1 * 1024 * 1024;
69
70 #define SWITCH64(x, y) \
71 { \
72 uint64_t __tmp = (x); \
73 (x) = (y); \
74 (y) = __tmp; \
75 }
76
77 #define DS_REF_MAX (1ULL << 62)
78
79 extern inline dsl_dataset_phys_t *dsl_dataset_phys(dsl_dataset_t *ds);
80
81 /*
82 * Figure out how much of this delta should be propogated to the dsl_dir
83 * layer. If there's a refreservation, that space has already been
84 * partially accounted for in our ancestors.
85 */
86 static int64_t
87 parent_delta(dsl_dataset_t *ds, int64_t delta)
88 {
89 dsl_dataset_phys_t *ds_phys;
90 uint64_t old_bytes, new_bytes;
91
92 if (ds->ds_reserved == 0)
93 return (delta);
94
95 ds_phys = dsl_dataset_phys(ds);
96 old_bytes = MAX(ds_phys->ds_unique_bytes, ds->ds_reserved);
97 new_bytes = MAX(ds_phys->ds_unique_bytes + delta, ds->ds_reserved);
98
99 ASSERT3U(ABS((int64_t)(new_bytes - old_bytes)), <=, ABS(delta));
100 return (new_bytes - old_bytes);
101 }
102
103 void
104 dsl_dataset_block_born(dsl_dataset_t *ds, const blkptr_t *bp, dmu_tx_t *tx)
105 {
106 int used, compressed, uncompressed;
107 int64_t delta;
108
109 used = bp_get_dsize_sync(tx->tx_pool->dp_spa, bp);
110 compressed = BP_GET_PSIZE(bp);
111 uncompressed = BP_GET_UCSIZE(bp);
112
113 dprintf_bp(bp, "ds=%p", ds);
114
115 ASSERT(dmu_tx_is_syncing(tx));
116 /* It could have been compressed away to nothing */
117 if (BP_IS_HOLE(bp))
118 return;
119 ASSERT(BP_GET_TYPE(bp) != DMU_OT_NONE);
120 ASSERT(DMU_OT_IS_VALID(BP_GET_TYPE(bp)));
121 if (ds == NULL) {
122 dsl_pool_mos_diduse_space(tx->tx_pool,
123 used, compressed, uncompressed);
124 return;
125 }
126
127 dmu_buf_will_dirty(ds->ds_dbuf, tx);
128 mutex_enter(&ds->ds_lock);
129 delta = parent_delta(ds, used);
130 dsl_dataset_phys(ds)->ds_referenced_bytes += used;
131 dsl_dataset_phys(ds)->ds_compressed_bytes += compressed;
132 dsl_dataset_phys(ds)->ds_uncompressed_bytes += uncompressed;
133 dsl_dataset_phys(ds)->ds_unique_bytes += used;
134 if (BP_GET_LSIZE(bp) > SPA_OLD_MAXBLOCKSIZE) {
135 ds->ds_feature_activation_needed[SPA_FEATURE_LARGE_BLOCKS] =
136 B_TRUE;
137 }
138 mutex_exit(&ds->ds_lock);
139 dsl_dir_diduse_space(ds->ds_dir, DD_USED_HEAD, delta,
140 compressed, uncompressed, tx);
141 dsl_dir_transfer_space(ds->ds_dir, used - delta,
142 DD_USED_REFRSRV, DD_USED_HEAD, tx);
143 }
144
145 int
146 dsl_dataset_block_kill(dsl_dataset_t *ds, const blkptr_t *bp, dmu_tx_t *tx,
147 boolean_t async)
148 {
149 int used = bp_get_dsize_sync(tx->tx_pool->dp_spa, bp);
150 int compressed = BP_GET_PSIZE(bp);
151 int uncompressed = BP_GET_UCSIZE(bp);
152
153 if (BP_IS_HOLE(bp))
154 return (0);
155
156 ASSERT(dmu_tx_is_syncing(tx));
157 ASSERT(bp->blk_birth <= tx->tx_txg);
158
159 if (ds == NULL) {
160 dsl_free(tx->tx_pool, tx->tx_txg, bp);
161 dsl_pool_mos_diduse_space(tx->tx_pool,
162 -used, -compressed, -uncompressed);
163 return (used);
164 }
165 ASSERT3P(tx->tx_pool, ==, ds->ds_dir->dd_pool);
166
167 ASSERT(!ds->ds_is_snapshot);
168 dmu_buf_will_dirty(ds->ds_dbuf, tx);
169
170 if (bp->blk_birth > dsl_dataset_phys(ds)->ds_prev_snap_txg) {
171 int64_t delta;
172
173 dprintf_bp(bp, "freeing ds=%llu", ds->ds_object);
174 dsl_free(tx->tx_pool, tx->tx_txg, bp);
175
176 mutex_enter(&ds->ds_lock);
177 ASSERT(dsl_dataset_phys(ds)->ds_unique_bytes >= used ||
178 !DS_UNIQUE_IS_ACCURATE(ds));
179 delta = parent_delta(ds, -used);
180 dsl_dataset_phys(ds)->ds_unique_bytes -= used;
181 mutex_exit(&ds->ds_lock);
182 dsl_dir_diduse_space(ds->ds_dir, DD_USED_HEAD,
183 delta, -compressed, -uncompressed, tx);
184 dsl_dir_transfer_space(ds->ds_dir, -used - delta,
185 DD_USED_REFRSRV, DD_USED_HEAD, tx);
186 } else {
187 dprintf_bp(bp, "putting on dead list: %s", "");
188 if (async) {
189 /*
190 * We are here as part of zio's write done callback,
191 * which means we're a zio interrupt thread. We can't
192 * call dsl_deadlist_insert() now because it may block
193 * waiting for I/O. Instead, put bp on the deferred
194 * queue and let dsl_pool_sync() finish the job.
195 */
196 bplist_append(&ds->ds_pending_deadlist, bp);
197 } else {
198 dsl_deadlist_insert(&ds->ds_deadlist, bp, tx);
199 }
200 ASSERT3U(ds->ds_prev->ds_object, ==,
201 dsl_dataset_phys(ds)->ds_prev_snap_obj);
202 ASSERT(dsl_dataset_phys(ds->ds_prev)->ds_num_children > 0);
203 /* if (bp->blk_birth > prev prev snap txg) prev unique += bs */
204 if (dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj ==
205 ds->ds_object && bp->blk_birth >
206 dsl_dataset_phys(ds->ds_prev)->ds_prev_snap_txg) {
207 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx);
208 mutex_enter(&ds->ds_prev->ds_lock);
209 dsl_dataset_phys(ds->ds_prev)->ds_unique_bytes += used;
210 mutex_exit(&ds->ds_prev->ds_lock);
211 }
212 if (bp->blk_birth > ds->ds_dir->dd_origin_txg) {
213 dsl_dir_transfer_space(ds->ds_dir, used,
214 DD_USED_HEAD, DD_USED_SNAP, tx);
215 }
216 }
217 mutex_enter(&ds->ds_lock);
218 ASSERT3U(dsl_dataset_phys(ds)->ds_referenced_bytes, >=, used);
219 dsl_dataset_phys(ds)->ds_referenced_bytes -= used;
220 ASSERT3U(dsl_dataset_phys(ds)->ds_compressed_bytes, >=, compressed);
221 dsl_dataset_phys(ds)->ds_compressed_bytes -= compressed;
222 ASSERT3U(dsl_dataset_phys(ds)->ds_uncompressed_bytes, >=, uncompressed);
223 dsl_dataset_phys(ds)->ds_uncompressed_bytes -= uncompressed;
224 mutex_exit(&ds->ds_lock);
225
226 return (used);
227 }
228
229 uint64_t
230 dsl_dataset_prev_snap_txg(dsl_dataset_t *ds)
231 {
232 uint64_t trysnap = 0;
233
234 if (ds == NULL)
235 return (0);
236 /*
237 * The snapshot creation could fail, but that would cause an
238 * incorrect FALSE return, which would only result in an
239 * overestimation of the amount of space that an operation would
240 * consume, which is OK.
241 *
242 * There's also a small window where we could miss a pending
243 * snapshot, because we could set the sync task in the quiescing
244 * phase. So this should only be used as a guess.
245 */
246 if (ds->ds_trysnap_txg >
247 spa_last_synced_txg(ds->ds_dir->dd_pool->dp_spa))
248 trysnap = ds->ds_trysnap_txg;
249 return (MAX(dsl_dataset_phys(ds)->ds_prev_snap_txg, trysnap));
250 }
251
252 boolean_t
253 dsl_dataset_block_freeable(dsl_dataset_t *ds, const blkptr_t *bp,
254 uint64_t blk_birth)
255 {
256 if (blk_birth <= dsl_dataset_prev_snap_txg(ds) ||
257 (bp != NULL && BP_IS_HOLE(bp)))
258 return (B_FALSE);
259
260 ddt_prefetch(dsl_dataset_get_spa(ds), bp);
261
262 return (B_TRUE);
263 }
264
265 static void
266 dsl_dataset_evict(void *dbu)
267 {
268 dsl_dataset_t *ds = dbu;
269
270 ASSERT(ds->ds_owner == NULL);
271
272 ds->ds_dbuf = NULL;
273
274 unique_remove(ds->ds_fsid_guid);
275
276 if (ds->ds_objset != NULL)
277 dmu_objset_evict(ds->ds_objset);
278
279 if (ds->ds_prev) {
280 dsl_dataset_rele(ds->ds_prev, ds);
281 ds->ds_prev = NULL;
282 }
283
284 bplist_destroy(&ds->ds_pending_deadlist);
285 if (ds->ds_deadlist.dl_os != NULL)
286 dsl_deadlist_close(&ds->ds_deadlist);
287 if (ds->ds_dir)
288 dsl_dir_async_rele(ds->ds_dir, ds);
289
290 ASSERT(!list_link_active(&ds->ds_synced_link));
291
292 list_destroy(&ds->ds_prop_cbs);
293 mutex_destroy(&ds->ds_lock);
294 mutex_destroy(&ds->ds_opening_lock);
295 mutex_destroy(&ds->ds_sendstream_lock);
296 refcount_destroy(&ds->ds_longholds);
297
298 kmem_free(ds, sizeof (dsl_dataset_t));
299 }
300
301 int
302 dsl_dataset_get_snapname(dsl_dataset_t *ds)
303 {
304 dsl_dataset_phys_t *headphys;
305 int err;
306 dmu_buf_t *headdbuf;
307 dsl_pool_t *dp = ds->ds_dir->dd_pool;
308 objset_t *mos = dp->dp_meta_objset;
309
310 if (ds->ds_snapname[0])
311 return (0);
312 if (dsl_dataset_phys(ds)->ds_next_snap_obj == 0)
313 return (0);
314
315 err = dmu_bonus_hold(mos, dsl_dir_phys(ds->ds_dir)->dd_head_dataset_obj,
316 FTAG, &headdbuf);
317 if (err != 0)
318 return (err);
319 headphys = headdbuf->db_data;
320 err = zap_value_search(dp->dp_meta_objset,
321 headphys->ds_snapnames_zapobj, ds->ds_object, 0, ds->ds_snapname);
322 if (err != 0 && zfs_recover == B_TRUE) {
323 err = 0;
324 (void) snprintf(ds->ds_snapname, sizeof (ds->ds_snapname),
325 "SNAPOBJ=%llu-ERR=%d",
326 (unsigned long long)ds->ds_object, err);
327 }
328 dmu_buf_rele(headdbuf, FTAG);
329 return (err);
330 }
331
332 int
333 dsl_dataset_snap_lookup(dsl_dataset_t *ds, const char *name, uint64_t *value)
334 {
335 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
336 uint64_t snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj;
337 matchtype_t mt;
338 int err;
339
340 if (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_CI_DATASET)
341 mt = MT_FIRST;
342 else
343 mt = MT_EXACT;
344
345 err = zap_lookup_norm(mos, snapobj, name, 8, 1,
346 value, mt, NULL, 0, NULL);
347 if (err == ENOTSUP && mt == MT_FIRST)
348 err = zap_lookup(mos, snapobj, name, 8, 1, value);
349 return (err);
350 }
351
352 int
353 dsl_dataset_snap_remove(dsl_dataset_t *ds, const char *name, dmu_tx_t *tx,
354 boolean_t adj_cnt)
355 {
356 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
357 uint64_t snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj;
358 matchtype_t mt;
359 int err;
360
361 dsl_dir_snap_cmtime_update(ds->ds_dir);
362
363 if (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_CI_DATASET)
364 mt = MT_FIRST;
365 else
366 mt = MT_EXACT;
367
368 err = zap_remove_norm(mos, snapobj, name, mt, tx);
369 if (err == ENOTSUP && mt == MT_FIRST)
370 err = zap_remove(mos, snapobj, name, tx);
371
372 if (err == 0 && adj_cnt)
373 dsl_fs_ss_count_adjust(ds->ds_dir, -1,
374 DD_FIELD_SNAPSHOT_COUNT, tx);
375
376 return (err);
377 }
378
379 boolean_t
380 dsl_dataset_try_add_ref(dsl_pool_t *dp, dsl_dataset_t *ds, void *tag)
381 {
382 dmu_buf_t *dbuf = ds->ds_dbuf;
383 boolean_t result = B_FALSE;
384
385 if (dbuf != NULL && dmu_buf_try_add_ref(dbuf, dp->dp_meta_objset,
386 ds->ds_object, DMU_BONUS_BLKID, tag)) {
387
388 if (ds == dmu_buf_get_user(dbuf))
389 result = B_TRUE;
390 else
391 dmu_buf_rele(dbuf, tag);
392 }
393
394 return (result);
395 }
396
397 int
398 dsl_dataset_hold_obj(dsl_pool_t *dp, uint64_t dsobj, void *tag,
399 dsl_dataset_t **dsp)
400 {
401 objset_t *mos = dp->dp_meta_objset;
402 dmu_buf_t *dbuf;
403 dsl_dataset_t *ds;
404 int err;
405 dmu_object_info_t doi;
406
407 ASSERT(dsl_pool_config_held(dp));
408
409 err = dmu_bonus_hold(mos, dsobj, tag, &dbuf);
410 if (err != 0)
411 return (err);
412
413 /* Make sure dsobj has the correct object type. */
414 dmu_object_info_from_db(dbuf, &doi);
415 if (doi.doi_bonus_type != DMU_OT_DSL_DATASET) {
416 dmu_buf_rele(dbuf, tag);
417 return (SET_ERROR(EINVAL));
418 }
419
420 ds = dmu_buf_get_user(dbuf);
421 if (ds == NULL) {
422 dsl_dataset_t *winner = NULL;
423
424 ds = kmem_zalloc(sizeof (dsl_dataset_t), KM_SLEEP);
425 ds->ds_dbuf = dbuf;
426 ds->ds_object = dsobj;
427 ds->ds_is_snapshot = dsl_dataset_phys(ds)->ds_num_children != 0;
428 list_link_init(&ds->ds_synced_link);
429
430 mutex_init(&ds->ds_lock, NULL, MUTEX_DEFAULT, NULL);
431 mutex_init(&ds->ds_opening_lock, NULL, MUTEX_DEFAULT, NULL);
432 mutex_init(&ds->ds_sendstream_lock, NULL, MUTEX_DEFAULT, NULL);
433 refcount_create(&ds->ds_longholds);
434
435 bplist_create(&ds->ds_pending_deadlist);
436 dsl_deadlist_open(&ds->ds_deadlist,
437 mos, dsl_dataset_phys(ds)->ds_deadlist_obj);
438
439 list_create(&ds->ds_sendstreams, sizeof (dmu_sendarg_t),
440 offsetof(dmu_sendarg_t, dsa_link));
441
442 list_create(&ds->ds_prop_cbs, sizeof (dsl_prop_cb_record_t),
443 offsetof(dsl_prop_cb_record_t, cbr_ds_node));
444
445 if (doi.doi_type == DMU_OTN_ZAP_METADATA) {
446 spa_feature_t f;
447
448 for (f = 0; f < SPA_FEATURES; f++) {
449 if (!(spa_feature_table[f].fi_flags &
450 ZFEATURE_FLAG_PER_DATASET))
451 continue;
452 err = zap_contains(mos, dsobj,
453 spa_feature_table[f].fi_guid);
454 if (err == 0) {
455 ds->ds_feature_inuse[f] = B_TRUE;
456 } else {
457 ASSERT3U(err, ==, ENOENT);
458 err = 0;
459 }
460 }
461 }
462
463 err = dsl_dir_hold_obj(dp,
464 dsl_dataset_phys(ds)->ds_dir_obj, NULL, ds, &ds->ds_dir);
465 if (err != 0) {
466 mutex_destroy(&ds->ds_lock);
467 mutex_destroy(&ds->ds_opening_lock);
468 mutex_destroy(&ds->ds_sendstream_lock);
469 refcount_destroy(&ds->ds_longholds);
470 bplist_destroy(&ds->ds_pending_deadlist);
471 dsl_deadlist_close(&ds->ds_deadlist);
472 kmem_free(ds, sizeof (dsl_dataset_t));
473 dmu_buf_rele(dbuf, tag);
474 return (err);
475 }
476
477 if (!ds->ds_is_snapshot) {
478 ds->ds_snapname[0] = '\0';
479 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) {
480 err = dsl_dataset_hold_obj(dp,
481 dsl_dataset_phys(ds)->ds_prev_snap_obj,
482 ds, &ds->ds_prev);
483 }
484 if (doi.doi_type == DMU_OTN_ZAP_METADATA) {
485 int zaperr = zap_lookup(mos, ds->ds_object,
486 DS_FIELD_BOOKMARK_NAMES,
487 sizeof (ds->ds_bookmarks), 1,
488 &ds->ds_bookmarks);
489 if (zaperr != ENOENT)
490 VERIFY0(zaperr);
491 }
492 } else {
493 if (zfs_flags & ZFS_DEBUG_SNAPNAMES)
494 err = dsl_dataset_get_snapname(ds);
495 if (err == 0 &&
496 dsl_dataset_phys(ds)->ds_userrefs_obj != 0) {
497 err = zap_count(
498 ds->ds_dir->dd_pool->dp_meta_objset,
499 dsl_dataset_phys(ds)->ds_userrefs_obj,
500 &ds->ds_userrefs);
501 }
502 }
503
504 if (err == 0 && !ds->ds_is_snapshot) {
505 err = dsl_prop_get_int_ds(ds,
506 zfs_prop_to_name(ZFS_PROP_REFRESERVATION),
507 &ds->ds_reserved);
508 if (err == 0) {
509 err = dsl_prop_get_int_ds(ds,
510 zfs_prop_to_name(ZFS_PROP_REFQUOTA),
511 &ds->ds_quota);
512 }
513 } else {
514 ds->ds_reserved = ds->ds_quota = 0;
515 }
516
517 dmu_buf_init_user(&ds->ds_dbu, dsl_dataset_evict, &ds->ds_dbuf);
518 if (err == 0)
519 winner = dmu_buf_set_user_ie(dbuf, &ds->ds_dbu);
520
521 if (err != 0 || winner != NULL) {
522 bplist_destroy(&ds->ds_pending_deadlist);
523 dsl_deadlist_close(&ds->ds_deadlist);
524 if (ds->ds_prev)
525 dsl_dataset_rele(ds->ds_prev, ds);
526 dsl_dir_rele(ds->ds_dir, ds);
527 mutex_destroy(&ds->ds_lock);
528 mutex_destroy(&ds->ds_opening_lock);
529 mutex_destroy(&ds->ds_sendstream_lock);
530 refcount_destroy(&ds->ds_longholds);
531 kmem_free(ds, sizeof (dsl_dataset_t));
532 if (err != 0) {
533 dmu_buf_rele(dbuf, tag);
534 return (err);
535 }
536 ds = winner;
537 } else {
538 ds->ds_fsid_guid =
539 unique_insert(dsl_dataset_phys(ds)->ds_fsid_guid);
540 }
541 }
542 ASSERT3P(ds->ds_dbuf, ==, dbuf);
543 ASSERT3P(dsl_dataset_phys(ds), ==, dbuf->db_data);
544 ASSERT(dsl_dataset_phys(ds)->ds_prev_snap_obj != 0 ||
545 spa_version(dp->dp_spa) < SPA_VERSION_ORIGIN ||
546 dp->dp_origin_snap == NULL || ds == dp->dp_origin_snap);
547 *dsp = ds;
548 return (0);
549 }
550
551 int
552 dsl_dataset_hold(dsl_pool_t *dp, const char *name,
553 void *tag, dsl_dataset_t **dsp)
554 {
555 dsl_dir_t *dd;
556 const char *snapname;
557 uint64_t obj;
558 int err = 0;
559 dsl_dataset_t *ds;
560
561 err = dsl_dir_hold(dp, name, FTAG, &dd, &snapname);
562 if (err != 0)
563 return (err);
564
565 ASSERT(dsl_pool_config_held(dp));
566 obj = dsl_dir_phys(dd)->dd_head_dataset_obj;
567 if (obj != 0)
568 err = dsl_dataset_hold_obj(dp, obj, tag, &ds);
569 else
570 err = SET_ERROR(ENOENT);
571
572 /* we may be looking for a snapshot */
573 if (err == 0 && snapname != NULL) {
574 dsl_dataset_t *snap_ds;
575
576 if (*snapname++ != '@') {
577 dsl_dataset_rele(ds, tag);
578 dsl_dir_rele(dd, FTAG);
579 return (SET_ERROR(ENOENT));
580 }
581
582 dprintf("looking for snapshot '%s'\n", snapname);
583 err = dsl_dataset_snap_lookup(ds, snapname, &obj);
584 if (err == 0)
585 err = dsl_dataset_hold_obj(dp, obj, tag, &snap_ds);
586 dsl_dataset_rele(ds, tag);
587
588 if (err == 0) {
589 mutex_enter(&snap_ds->ds_lock);
590 if (snap_ds->ds_snapname[0] == 0)
591 (void) strlcpy(snap_ds->ds_snapname, snapname,
592 sizeof (snap_ds->ds_snapname));
593 mutex_exit(&snap_ds->ds_lock);
594 ds = snap_ds;
595 }
596 }
597 if (err == 0)
598 *dsp = ds;
599 dsl_dir_rele(dd, FTAG);
600 return (err);
601 }
602
603 int
604 dsl_dataset_own_obj(dsl_pool_t *dp, uint64_t dsobj,
605 void *tag, dsl_dataset_t **dsp)
606 {
607 int err = dsl_dataset_hold_obj(dp, dsobj, tag, dsp);
608 if (err != 0)
609 return (err);
610 if (!dsl_dataset_tryown(*dsp, tag)) {
611 dsl_dataset_rele(*dsp, tag);
612 *dsp = NULL;
613 return (SET_ERROR(EBUSY));
614 }
615 return (0);
616 }
617
618 int
619 dsl_dataset_own(dsl_pool_t *dp, const char *name,
620 void *tag, dsl_dataset_t **dsp)
621 {
622 int err = dsl_dataset_hold(dp, name, tag, dsp);
623 if (err != 0)
624 return (err);
625 if (!dsl_dataset_tryown(*dsp, tag)) {
626 dsl_dataset_rele(*dsp, tag);
627 return (SET_ERROR(EBUSY));
628 }
629 return (0);
630 }
631
632 /*
633 * See the comment above dsl_pool_hold() for details. In summary, a long
634 * hold is used to prevent destruction of a dataset while the pool hold
635 * is dropped, allowing other concurrent operations (e.g. spa_sync()).
636 *
637 * The dataset and pool must be held when this function is called. After it
638 * is called, the pool hold may be released while the dataset is still held
639 * and accessed.
640 */
641 void
642 dsl_dataset_long_hold(dsl_dataset_t *ds, void *tag)
643 {
644 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool));
645 (void) refcount_add(&ds->ds_longholds, tag);
646 }
647
648 void
649 dsl_dataset_long_rele(dsl_dataset_t *ds, void *tag)
650 {
651 (void) refcount_remove(&ds->ds_longholds, tag);
652 }
653
654 /* Return B_TRUE if there are any long holds on this dataset. */
655 boolean_t
656 dsl_dataset_long_held(dsl_dataset_t *ds)
657 {
658 return (!refcount_is_zero(&ds->ds_longholds));
659 }
660
661 void
662 dsl_dataset_name(dsl_dataset_t *ds, char *name)
663 {
664 if (ds == NULL) {
665 (void) strcpy(name, "mos");
666 } else {
667 dsl_dir_name(ds->ds_dir, name);
668 VERIFY0(dsl_dataset_get_snapname(ds));
669 if (ds->ds_snapname[0]) {
670 (void) strcat(name, "@");
671 /*
672 * We use a "recursive" mutex so that we
673 * can call dprintf_ds() with ds_lock held.
674 */
675 if (!MUTEX_HELD(&ds->ds_lock)) {
676 mutex_enter(&ds->ds_lock);
677 (void) strcat(name, ds->ds_snapname);
678 mutex_exit(&ds->ds_lock);
679 } else {
680 (void) strcat(name, ds->ds_snapname);
681 }
682 }
683 }
684 }
685
686 void
687 dsl_dataset_rele(dsl_dataset_t *ds, void *tag)
688 {
689 dmu_buf_rele(ds->ds_dbuf, tag);
690 }
691
692 void
693 dsl_dataset_disown(dsl_dataset_t *ds, void *tag)
694 {
695 ASSERT3P(ds->ds_owner, ==, tag);
696 ASSERT(ds->ds_dbuf != NULL);
697
698 mutex_enter(&ds->ds_lock);
699 ds->ds_owner = NULL;
700 mutex_exit(&ds->ds_lock);
701 dsl_dataset_long_rele(ds, tag);
702 dsl_dataset_rele(ds, tag);
703 }
704
705 boolean_t
706 dsl_dataset_tryown(dsl_dataset_t *ds, void *tag)
707 {
708 boolean_t gotit = FALSE;
709
710 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool));
711 mutex_enter(&ds->ds_lock);
712 if (ds->ds_owner == NULL && !DS_IS_INCONSISTENT(ds)) {
713 ds->ds_owner = tag;
714 dsl_dataset_long_hold(ds, tag);
715 gotit = TRUE;
716 }
717 mutex_exit(&ds->ds_lock);
718 return (gotit);
719 }
720
721 boolean_t
722 dsl_dataset_has_owner(dsl_dataset_t *ds)
723 {
724 boolean_t rv;
725 mutex_enter(&ds->ds_lock);
726 rv = (ds->ds_owner != NULL);
727 mutex_exit(&ds->ds_lock);
728 return (rv);
729 }
730
731 static void
732 dsl_dataset_activate_feature(uint64_t dsobj, spa_feature_t f, dmu_tx_t *tx)
733 {
734 spa_t *spa = dmu_tx_pool(tx)->dp_spa;
735 objset_t *mos = dmu_tx_pool(tx)->dp_meta_objset;
736 uint64_t zero = 0;
737
738 VERIFY(spa_feature_table[f].fi_flags & ZFEATURE_FLAG_PER_DATASET);
739
740 spa_feature_incr(spa, f, tx);
741 dmu_object_zapify(mos, dsobj, DMU_OT_DSL_DATASET, tx);
742
743 VERIFY0(zap_add(mos, dsobj, spa_feature_table[f].fi_guid,
744 sizeof (zero), 1, &zero, tx));
745 }
746
747 void
748 dsl_dataset_deactivate_feature(uint64_t dsobj, spa_feature_t f, dmu_tx_t *tx)
749 {
750 spa_t *spa = dmu_tx_pool(tx)->dp_spa;
751 objset_t *mos = dmu_tx_pool(tx)->dp_meta_objset;
752
753 VERIFY(spa_feature_table[f].fi_flags & ZFEATURE_FLAG_PER_DATASET);
754
755 VERIFY0(zap_remove(mos, dsobj, spa_feature_table[f].fi_guid, tx));
756 spa_feature_decr(spa, f, tx);
757 }
758
759 uint64_t
760 dsl_dataset_create_sync_dd(dsl_dir_t *dd, dsl_dataset_t *origin,
761 uint64_t flags, dmu_tx_t *tx)
762 {
763 dsl_pool_t *dp = dd->dd_pool;
764 dmu_buf_t *dbuf;
765 dsl_dataset_phys_t *dsphys;
766 uint64_t dsobj;
767 objset_t *mos = dp->dp_meta_objset;
768
769 if (origin == NULL)
770 origin = dp->dp_origin_snap;
771
772 ASSERT(origin == NULL || origin->ds_dir->dd_pool == dp);
773 ASSERT(origin == NULL || dsl_dataset_phys(origin)->ds_num_children > 0);
774 ASSERT(dmu_tx_is_syncing(tx));
775 ASSERT(dsl_dir_phys(dd)->dd_head_dataset_obj == 0);
776
777 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0,
778 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx);
779 VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf));
780 dmu_buf_will_dirty(dbuf, tx);
781 dsphys = dbuf->db_data;
782 bzero(dsphys, sizeof (dsl_dataset_phys_t));
783 dsphys->ds_dir_obj = dd->dd_object;
784 dsphys->ds_flags = flags;
785 dsphys->ds_fsid_guid = unique_create();
786 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid,
787 sizeof (dsphys->ds_guid));
788 dsphys->ds_snapnames_zapobj =
789 zap_create_norm(mos, U8_TEXTPREP_TOUPPER, DMU_OT_DSL_DS_SNAP_MAP,
790 DMU_OT_NONE, 0, tx);
791 dsphys->ds_creation_time = gethrestime_sec();
792 dsphys->ds_creation_txg = tx->tx_txg == TXG_INITIAL ? 1 : tx->tx_txg;
793
794 if (origin == NULL) {
795 dsphys->ds_deadlist_obj = dsl_deadlist_alloc(mos, tx);
796 } else {
797 spa_feature_t f;
798 dsl_dataset_t *ohds; /* head of the origin snapshot */
799
800 dsphys->ds_prev_snap_obj = origin->ds_object;
801 dsphys->ds_prev_snap_txg =
802 dsl_dataset_phys(origin)->ds_creation_txg;
803 dsphys->ds_referenced_bytes =
804 dsl_dataset_phys(origin)->ds_referenced_bytes;
805 dsphys->ds_compressed_bytes =
806 dsl_dataset_phys(origin)->ds_compressed_bytes;
807 dsphys->ds_uncompressed_bytes =
808 dsl_dataset_phys(origin)->ds_uncompressed_bytes;
809 dsphys->ds_bp = dsl_dataset_phys(origin)->ds_bp;
810
811 /*
812 * Inherit flags that describe the dataset's contents
813 * (INCONSISTENT) or properties (Case Insensitive).
814 */
815 dsphys->ds_flags |= dsl_dataset_phys(origin)->ds_flags &
816 (DS_FLAG_INCONSISTENT | DS_FLAG_CI_DATASET);
817
818 for (f = 0; f < SPA_FEATURES; f++) {
819 if (origin->ds_feature_inuse[f])
820 dsl_dataset_activate_feature(dsobj, f, tx);
821 }
822
823 dmu_buf_will_dirty(origin->ds_dbuf, tx);
824 dsl_dataset_phys(origin)->ds_num_children++;
825
826 VERIFY0(dsl_dataset_hold_obj(dp,
827 dsl_dir_phys(origin->ds_dir)->dd_head_dataset_obj,
828 FTAG, &ohds));
829 dsphys->ds_deadlist_obj = dsl_deadlist_clone(&ohds->ds_deadlist,
830 dsphys->ds_prev_snap_txg, dsphys->ds_prev_snap_obj, tx);
831 dsl_dataset_rele(ohds, FTAG);
832
833 if (spa_version(dp->dp_spa) >= SPA_VERSION_NEXT_CLONES) {
834 if (dsl_dataset_phys(origin)->ds_next_clones_obj == 0) {
835 dsl_dataset_phys(origin)->ds_next_clones_obj =
836 zap_create(mos,
837 DMU_OT_NEXT_CLONES, DMU_OT_NONE, 0, tx);
838 }
839 VERIFY0(zap_add_int(mos,
840 dsl_dataset_phys(origin)->ds_next_clones_obj,
841 dsobj, tx));
842 }
843
844 dmu_buf_will_dirty(dd->dd_dbuf, tx);
845 dsl_dir_phys(dd)->dd_origin_obj = origin->ds_object;
846 if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) {
847 if (dsl_dir_phys(origin->ds_dir)->dd_clones == 0) {
848 dmu_buf_will_dirty(origin->ds_dir->dd_dbuf, tx);
849 dsl_dir_phys(origin->ds_dir)->dd_clones =
850 zap_create(mos,
851 DMU_OT_DSL_CLONES, DMU_OT_NONE, 0, tx);
852 }
853 VERIFY0(zap_add_int(mos,
854 dsl_dir_phys(origin->ds_dir)->dd_clones,
855 dsobj, tx));
856 }
857 }
858
859 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE)
860 dsphys->ds_flags |= DS_FLAG_UNIQUE_ACCURATE;
861
862 dmu_buf_rele(dbuf, FTAG);
863
864 dmu_buf_will_dirty(dd->dd_dbuf, tx);
865 dsl_dir_phys(dd)->dd_head_dataset_obj = dsobj;
866
867 return (dsobj);
868 }
869
870 static void
871 dsl_dataset_zero_zil(dsl_dataset_t *ds, dmu_tx_t *tx)
872 {
873 objset_t *os;
874
875 VERIFY0(dmu_objset_from_ds(ds, &os));
876 bzero(&os->os_zil_header, sizeof (os->os_zil_header));
877 dsl_dataset_dirty(ds, tx);
878 }
879
880 uint64_t
881 dsl_dataset_create_sync(dsl_dir_t *pdd, const char *lastname,
882 dsl_dataset_t *origin, uint64_t flags, cred_t *cr, dmu_tx_t *tx)
883 {
884 dsl_pool_t *dp = pdd->dd_pool;
885 uint64_t dsobj, ddobj;
886 dsl_dir_t *dd;
887
888 ASSERT(dmu_tx_is_syncing(tx));
889 ASSERT(lastname[0] != '@');
890
891 ddobj = dsl_dir_create_sync(dp, pdd, lastname, tx);
892 VERIFY0(dsl_dir_hold_obj(dp, ddobj, lastname, FTAG, &dd));
893
894 dsobj = dsl_dataset_create_sync_dd(dd, origin,
895 flags & ~DS_CREATE_FLAG_NODIRTY, tx);
896
897 dsl_deleg_set_create_perms(dd, tx, cr);
898
899 /*
900 * Since we're creating a new node we know it's a leaf, so we can
901 * initialize the counts if the limit feature is active.
902 */
903 if (spa_feature_is_active(dp->dp_spa, SPA_FEATURE_FS_SS_LIMIT)) {
904 uint64_t cnt = 0;
905 objset_t *os = dd->dd_pool->dp_meta_objset;
906
907 dsl_dir_zapify(dd, tx);
908 VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_FILESYSTEM_COUNT,
909 sizeof (cnt), 1, &cnt, tx));
910 VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_SNAPSHOT_COUNT,
911 sizeof (cnt), 1, &cnt, tx));
912 }
913
914 dsl_dir_rele(dd, FTAG);
915
916 /*
917 * If we are creating a clone, make sure we zero out any stale
918 * data from the origin snapshots zil header.
919 */
920 if (origin != NULL && !(flags & DS_CREATE_FLAG_NODIRTY)) {
921 dsl_dataset_t *ds;
922
923 VERIFY0(dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds));
924 dsl_dataset_zero_zil(ds, tx);
925 dsl_dataset_rele(ds, FTAG);
926 }
927
928 return (dsobj);
929 }
930
931 /*
932 * The unique space in the head dataset can be calculated by subtracting
933 * the space used in the most recent snapshot, that is still being used
934 * in this file system, from the space currently in use. To figure out
935 * the space in the most recent snapshot still in use, we need to take
936 * the total space used in the snapshot and subtract out the space that
937 * has been freed up since the snapshot was taken.
938 */
939 void
940 dsl_dataset_recalc_head_uniq(dsl_dataset_t *ds)
941 {
942 uint64_t mrs_used;
943 uint64_t dlused, dlcomp, dluncomp;
944
945 ASSERT(!ds->ds_is_snapshot);
946
947 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0)
948 mrs_used = dsl_dataset_phys(ds->ds_prev)->ds_referenced_bytes;
949 else
950 mrs_used = 0;
951
952 dsl_deadlist_space(&ds->ds_deadlist, &dlused, &dlcomp, &dluncomp);
953
954 ASSERT3U(dlused, <=, mrs_used);
955 dsl_dataset_phys(ds)->ds_unique_bytes =
956 dsl_dataset_phys(ds)->ds_referenced_bytes - (mrs_used - dlused);
957
958 if (spa_version(ds->ds_dir->dd_pool->dp_spa) >=
959 SPA_VERSION_UNIQUE_ACCURATE)
960 dsl_dataset_phys(ds)->ds_flags |= DS_FLAG_UNIQUE_ACCURATE;
961 }
962
963 void
964 dsl_dataset_remove_from_next_clones(dsl_dataset_t *ds, uint64_t obj,
965 dmu_tx_t *tx)
966 {
967 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
968 int err;
969 ASSERTV(uint64_t count);
970
971 ASSERT(dsl_dataset_phys(ds)->ds_num_children >= 2);
972 err = zap_remove_int(mos, dsl_dataset_phys(ds)->ds_next_clones_obj,
973 obj, tx);
974 /*
975 * The err should not be ENOENT, but a bug in a previous version
976 * of the code could cause upgrade_clones_cb() to not set
977 * ds_next_snap_obj when it should, leading to a missing entry.
978 * If we knew that the pool was created after
979 * SPA_VERSION_NEXT_CLONES, we could assert that it isn't
980 * ENOENT. However, at least we can check that we don't have
981 * too many entries in the next_clones_obj even after failing to
982 * remove this one.
983 */
984 if (err != ENOENT)
985 VERIFY0(err);
986 ASSERT0(zap_count(mos, dsl_dataset_phys(ds)->ds_next_clones_obj,
987 &count));
988 ASSERT3U(count, <=, dsl_dataset_phys(ds)->ds_num_children - 2);
989 }
990
991
992 blkptr_t *
993 dsl_dataset_get_blkptr(dsl_dataset_t *ds)
994 {
995 return (&dsl_dataset_phys(ds)->ds_bp);
996 }
997
998 void
999 dsl_dataset_set_blkptr(dsl_dataset_t *ds, blkptr_t *bp, dmu_tx_t *tx)
1000 {
1001 ASSERT(dmu_tx_is_syncing(tx));
1002 /* If it's the meta-objset, set dp_meta_rootbp */
1003 if (ds == NULL) {
1004 tx->tx_pool->dp_meta_rootbp = *bp;
1005 } else {
1006 dmu_buf_will_dirty(ds->ds_dbuf, tx);
1007 dsl_dataset_phys(ds)->ds_bp = *bp;
1008 }
1009 }
1010
1011 spa_t *
1012 dsl_dataset_get_spa(dsl_dataset_t *ds)
1013 {
1014 return (ds->ds_dir->dd_pool->dp_spa);
1015 }
1016
1017 void
1018 dsl_dataset_dirty(dsl_dataset_t *ds, dmu_tx_t *tx)
1019 {
1020 dsl_pool_t *dp;
1021
1022 if (ds == NULL) /* this is the meta-objset */
1023 return;
1024
1025 ASSERT(ds->ds_objset != NULL);
1026
1027 if (dsl_dataset_phys(ds)->ds_next_snap_obj != 0)
1028 panic("dirtying snapshot!");
1029
1030 dp = ds->ds_dir->dd_pool;
1031
1032 if (txg_list_add(&dp->dp_dirty_datasets, ds, tx->tx_txg)) {
1033 /* up the hold count until we can be written out */
1034 dmu_buf_add_ref(ds->ds_dbuf, ds);
1035 }
1036 }
1037
1038 boolean_t
1039 dsl_dataset_is_dirty(dsl_dataset_t *ds)
1040 {
1041 int t;
1042
1043 for (t = 0; t < TXG_SIZE; t++) {
1044 if (txg_list_member(&ds->ds_dir->dd_pool->dp_dirty_datasets,
1045 ds, t))
1046 return (B_TRUE);
1047 }
1048 return (B_FALSE);
1049 }
1050
1051 static int
1052 dsl_dataset_snapshot_reserve_space(dsl_dataset_t *ds, dmu_tx_t *tx)
1053 {
1054 uint64_t asize;
1055
1056 if (!dmu_tx_is_syncing(tx))
1057 return (0);
1058
1059 /*
1060 * If there's an fs-only reservation, any blocks that might become
1061 * owned by the snapshot dataset must be accommodated by space
1062 * outside of the reservation.
1063 */
1064 ASSERT(ds->ds_reserved == 0 || DS_UNIQUE_IS_ACCURATE(ds));
1065 asize = MIN(dsl_dataset_phys(ds)->ds_unique_bytes, ds->ds_reserved);
1066 if (asize > dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE))
1067 return (SET_ERROR(ENOSPC));
1068
1069 /*
1070 * Propagate any reserved space for this snapshot to other
1071 * snapshot checks in this sync group.
1072 */
1073 if (asize > 0)
1074 dsl_dir_willuse_space(ds->ds_dir, asize, tx);
1075
1076 return (0);
1077 }
1078
1079 typedef struct dsl_dataset_snapshot_arg {
1080 nvlist_t *ddsa_snaps;
1081 nvlist_t *ddsa_props;
1082 nvlist_t *ddsa_errors;
1083 cred_t *ddsa_cr;
1084 } dsl_dataset_snapshot_arg_t;
1085
1086 int
1087 dsl_dataset_snapshot_check_impl(dsl_dataset_t *ds, const char *snapname,
1088 dmu_tx_t *tx, boolean_t recv, uint64_t cnt, cred_t *cr)
1089 {
1090 int error;
1091 uint64_t value;
1092
1093 ds->ds_trysnap_txg = tx->tx_txg;
1094
1095 if (!dmu_tx_is_syncing(tx))
1096 return (0);
1097
1098 /*
1099 * We don't allow multiple snapshots of the same txg. If there
1100 * is already one, try again.
1101 */
1102 if (dsl_dataset_phys(ds)->ds_prev_snap_txg >= tx->tx_txg)
1103 return (SET_ERROR(EAGAIN));
1104
1105 /*
1106 * Check for conflicting snapshot name.
1107 */
1108 error = dsl_dataset_snap_lookup(ds, snapname, &value);
1109 if (error == 0)
1110 return (SET_ERROR(EEXIST));
1111 if (error != ENOENT)
1112 return (error);
1113
1114 /*
1115 * We don't allow taking snapshots of inconsistent datasets, such as
1116 * those into which we are currently receiving. However, if we are
1117 * creating this snapshot as part of a receive, this check will be
1118 * executed atomically with respect to the completion of the receive
1119 * itself but prior to the clearing of DS_FLAG_INCONSISTENT; in this
1120 * case we ignore this, knowing it will be fixed up for us shortly in
1121 * dmu_recv_end_sync().
1122 */
1123 if (!recv && DS_IS_INCONSISTENT(ds))
1124 return (SET_ERROR(EBUSY));
1125
1126 /*
1127 * Skip the check for temporary snapshots or if we have already checked
1128 * the counts in dsl_dataset_snapshot_check. This means we really only
1129 * check the count here when we're receiving a stream.
1130 */
1131 if (cnt != 0 && cr != NULL) {
1132 error = dsl_fs_ss_limit_check(ds->ds_dir, cnt,
1133 ZFS_PROP_SNAPSHOT_LIMIT, NULL, cr);
1134 if (error != 0)
1135 return (error);
1136 }
1137
1138 error = dsl_dataset_snapshot_reserve_space(ds, tx);
1139 if (error != 0)
1140 return (error);
1141
1142 return (0);
1143 }
1144
1145 static int
1146 dsl_dataset_snapshot_check(void *arg, dmu_tx_t *tx)
1147 {
1148 dsl_dataset_snapshot_arg_t *ddsa = arg;
1149 dsl_pool_t *dp = dmu_tx_pool(tx);
1150 nvpair_t *pair;
1151 int rv = 0;
1152
1153 /*
1154 * Pre-compute how many total new snapshots will be created for each
1155 * level in the tree and below. This is needed for validating the
1156 * snapshot limit when either taking a recursive snapshot or when
1157 * taking multiple snapshots.
1158 *
1159 * The problem is that the counts are not actually adjusted when
1160 * we are checking, only when we finally sync. For a single snapshot,
1161 * this is easy, the count will increase by 1 at each node up the tree,
1162 * but its more complicated for the recursive/multiple snapshot case.
1163 *
1164 * The dsl_fs_ss_limit_check function does recursively check the count
1165 * at each level up the tree but since it is validating each snapshot
1166 * independently we need to be sure that we are validating the complete
1167 * count for the entire set of snapshots. We do this by rolling up the
1168 * counts for each component of the name into an nvlist and then
1169 * checking each of those cases with the aggregated count.
1170 *
1171 * This approach properly handles not only the recursive snapshot
1172 * case (where we get all of those on the ddsa_snaps list) but also
1173 * the sibling case (e.g. snapshot a/b and a/c so that we will also
1174 * validate the limit on 'a' using a count of 2).
1175 *
1176 * We validate the snapshot names in the third loop and only report
1177 * name errors once.
1178 */
1179 if (dmu_tx_is_syncing(tx)) {
1180 char *nm;
1181 nvlist_t *cnt_track = NULL;
1182 cnt_track = fnvlist_alloc();
1183
1184 nm = kmem_alloc(MAXPATHLEN, KM_SLEEP);
1185
1186 /* Rollup aggregated counts into the cnt_track list */
1187 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL);
1188 pair != NULL;
1189 pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) {
1190 char *pdelim;
1191 uint64_t val;
1192
1193 (void) strlcpy(nm, nvpair_name(pair), MAXPATHLEN);
1194 pdelim = strchr(nm, '@');
1195 if (pdelim == NULL)
1196 continue;
1197 *pdelim = '\0';
1198
1199 do {
1200 if (nvlist_lookup_uint64(cnt_track, nm,
1201 &val) == 0) {
1202 /* update existing entry */
1203 fnvlist_add_uint64(cnt_track, nm,
1204 val + 1);
1205 } else {
1206 /* add to list */
1207 fnvlist_add_uint64(cnt_track, nm, 1);
1208 }
1209
1210 pdelim = strrchr(nm, '/');
1211 if (pdelim != NULL)
1212 *pdelim = '\0';
1213 } while (pdelim != NULL);
1214 }
1215
1216 kmem_free(nm, MAXPATHLEN);
1217
1218 /* Check aggregated counts at each level */
1219 for (pair = nvlist_next_nvpair(cnt_track, NULL);
1220 pair != NULL; pair = nvlist_next_nvpair(cnt_track, pair)) {
1221 int error = 0;
1222 char *name;
1223 uint64_t cnt = 0;
1224 dsl_dataset_t *ds;
1225
1226 name = nvpair_name(pair);
1227 cnt = fnvpair_value_uint64(pair);
1228 ASSERT(cnt > 0);
1229
1230 error = dsl_dataset_hold(dp, name, FTAG, &ds);
1231 if (error == 0) {
1232 error = dsl_fs_ss_limit_check(ds->ds_dir, cnt,
1233 ZFS_PROP_SNAPSHOT_LIMIT, NULL,
1234 ddsa->ddsa_cr);
1235 dsl_dataset_rele(ds, FTAG);
1236 }
1237
1238 if (error != 0) {
1239 if (ddsa->ddsa_errors != NULL)
1240 fnvlist_add_int32(ddsa->ddsa_errors,
1241 name, error);
1242 rv = error;
1243 /* only report one error for this check */
1244 break;
1245 }
1246 }
1247 nvlist_free(cnt_track);
1248 }
1249
1250 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL);
1251 pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) {
1252 int error = 0;
1253 dsl_dataset_t *ds;
1254 char *name, *atp;
1255 char dsname[MAXNAMELEN];
1256
1257 name = nvpair_name(pair);
1258 if (strlen(name) >= MAXNAMELEN)
1259 error = SET_ERROR(ENAMETOOLONG);
1260 if (error == 0) {
1261 atp = strchr(name, '@');
1262 if (atp == NULL)
1263 error = SET_ERROR(EINVAL);
1264 if (error == 0)
1265 (void) strlcpy(dsname, name, atp - name + 1);
1266 }
1267 if (error == 0)
1268 error = dsl_dataset_hold(dp, dsname, FTAG, &ds);
1269 if (error == 0) {
1270 /* passing 0/NULL skips dsl_fs_ss_limit_check */
1271 error = dsl_dataset_snapshot_check_impl(ds,
1272 atp + 1, tx, B_FALSE, 0, NULL);
1273 dsl_dataset_rele(ds, FTAG);
1274 }
1275
1276 if (error != 0) {
1277 if (ddsa->ddsa_errors != NULL) {
1278 fnvlist_add_int32(ddsa->ddsa_errors,
1279 name, error);
1280 }
1281 rv = error;
1282 }
1283 }
1284
1285 return (rv);
1286 }
1287
1288 void
1289 dsl_dataset_snapshot_sync_impl(dsl_dataset_t *ds, const char *snapname,
1290 dmu_tx_t *tx)
1291 {
1292 dsl_pool_t *dp = ds->ds_dir->dd_pool;
1293 dmu_buf_t *dbuf;
1294 dsl_dataset_phys_t *dsphys;
1295 uint64_t dsobj, crtxg;
1296 objset_t *mos = dp->dp_meta_objset;
1297 spa_feature_t f;
1298 ASSERTV(static zil_header_t zero_zil);
1299 ASSERTV(objset_t *os);
1300
1301 ASSERT(RRW_WRITE_HELD(&dp->dp_config_rwlock));
1302
1303 /*
1304 * If we are on an old pool, the zil must not be active, in which
1305 * case it will be zeroed. Usually zil_suspend() accomplishes this.
1306 */
1307 ASSERT(spa_version(dmu_tx_pool(tx)->dp_spa) >= SPA_VERSION_FAST_SNAP ||
1308 dmu_objset_from_ds(ds, &os) != 0 ||
1309 bcmp(&os->os_phys->os_zil_header, &zero_zil,
1310 sizeof (zero_zil)) == 0);
1311
1312 dsl_fs_ss_count_adjust(ds->ds_dir, 1, DD_FIELD_SNAPSHOT_COUNT, tx);
1313
1314 /*
1315 * The origin's ds_creation_txg has to be < TXG_INITIAL
1316 */
1317 if (strcmp(snapname, ORIGIN_DIR_NAME) == 0)
1318 crtxg = 1;
1319 else
1320 crtxg = tx->tx_txg;
1321
1322 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0,
1323 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx);
1324 VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf));
1325 dmu_buf_will_dirty(dbuf, tx);
1326 dsphys = dbuf->db_data;
1327 bzero(dsphys, sizeof (dsl_dataset_phys_t));
1328 dsphys->ds_dir_obj = ds->ds_dir->dd_object;
1329 dsphys->ds_fsid_guid = unique_create();
1330 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid,
1331 sizeof (dsphys->ds_guid));
1332 dsphys->ds_prev_snap_obj = dsl_dataset_phys(ds)->ds_prev_snap_obj;
1333 dsphys->ds_prev_snap_txg = dsl_dataset_phys(ds)->ds_prev_snap_txg;
1334 dsphys->ds_next_snap_obj = ds->ds_object;
1335 dsphys->ds_num_children = 1;
1336 dsphys->ds_creation_time = gethrestime_sec();
1337 dsphys->ds_creation_txg = crtxg;
1338 dsphys->ds_deadlist_obj = dsl_dataset_phys(ds)->ds_deadlist_obj;
1339 dsphys->ds_referenced_bytes = dsl_dataset_phys(ds)->ds_referenced_bytes;
1340 dsphys->ds_compressed_bytes = dsl_dataset_phys(ds)->ds_compressed_bytes;
1341 dsphys->ds_uncompressed_bytes =
1342 dsl_dataset_phys(ds)->ds_uncompressed_bytes;
1343 dsphys->ds_flags = dsl_dataset_phys(ds)->ds_flags;
1344 dsphys->ds_bp = dsl_dataset_phys(ds)->ds_bp;
1345 dmu_buf_rele(dbuf, FTAG);
1346
1347 for (f = 0; f < SPA_FEATURES; f++) {
1348 if (ds->ds_feature_inuse[f])
1349 dsl_dataset_activate_feature(dsobj, f, tx);
1350 }
1351
1352 ASSERT3U(ds->ds_prev != 0, ==,
1353 dsl_dataset_phys(ds)->ds_prev_snap_obj != 0);
1354 if (ds->ds_prev) {
1355 uint64_t next_clones_obj =
1356 dsl_dataset_phys(ds->ds_prev)->ds_next_clones_obj;
1357 ASSERT(dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj ==
1358 ds->ds_object ||
1359 dsl_dataset_phys(ds->ds_prev)->ds_num_children > 1);
1360 if (dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj ==
1361 ds->ds_object) {
1362 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx);
1363 ASSERT3U(dsl_dataset_phys(ds)->ds_prev_snap_txg, ==,
1364 dsl_dataset_phys(ds->ds_prev)->ds_creation_txg);
1365 dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj = dsobj;
1366 } else if (next_clones_obj != 0) {
1367 dsl_dataset_remove_from_next_clones(ds->ds_prev,
1368 dsphys->ds_next_snap_obj, tx);
1369 VERIFY0(zap_add_int(mos,
1370 next_clones_obj, dsobj, tx));
1371 }
1372 }
1373
1374 /*
1375 * If we have a reference-reservation on this dataset, we will
1376 * need to increase the amount of refreservation being charged
1377 * since our unique space is going to zero.
1378 */
1379 if (ds->ds_reserved) {
1380 int64_t delta;
1381 ASSERT(DS_UNIQUE_IS_ACCURATE(ds));
1382 delta = MIN(dsl_dataset_phys(ds)->ds_unique_bytes,
1383 ds->ds_reserved);
1384 dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV,
1385 delta, 0, 0, tx);
1386 }
1387
1388 dmu_buf_will_dirty(ds->ds_dbuf, tx);
1389 dsl_dataset_phys(ds)->ds_deadlist_obj =
1390 dsl_deadlist_clone(&ds->ds_deadlist, UINT64_MAX,
1391 dsl_dataset_phys(ds)->ds_prev_snap_obj, tx);
1392 dsl_deadlist_close(&ds->ds_deadlist);
1393 dsl_deadlist_open(&ds->ds_deadlist, mos,
1394 dsl_dataset_phys(ds)->ds_deadlist_obj);
1395 dsl_deadlist_add_key(&ds->ds_deadlist,
1396 dsl_dataset_phys(ds)->ds_prev_snap_txg, tx);
1397
1398 ASSERT3U(dsl_dataset_phys(ds)->ds_prev_snap_txg, <, tx->tx_txg);
1399 dsl_dataset_phys(ds)->ds_prev_snap_obj = dsobj;
1400 dsl_dataset_phys(ds)->ds_prev_snap_txg = crtxg;
1401 dsl_dataset_phys(ds)->ds_unique_bytes = 0;
1402 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE)
1403 dsl_dataset_phys(ds)->ds_flags |= DS_FLAG_UNIQUE_ACCURATE;
1404
1405 VERIFY0(zap_add(mos, dsl_dataset_phys(ds)->ds_snapnames_zapobj,
1406 snapname, 8, 1, &dsobj, tx));
1407
1408 if (ds->ds_prev)
1409 dsl_dataset_rele(ds->ds_prev, ds);
1410 VERIFY0(dsl_dataset_hold_obj(dp,
1411 dsl_dataset_phys(ds)->ds_prev_snap_obj, ds, &ds->ds_prev));
1412
1413 dsl_scan_ds_snapshotted(ds, tx);
1414
1415 dsl_dir_snap_cmtime_update(ds->ds_dir);
1416
1417 spa_history_log_internal_ds(ds->ds_prev, "snapshot", tx, "");
1418 }
1419
1420 static void
1421 dsl_dataset_snapshot_sync(void *arg, dmu_tx_t *tx)
1422 {
1423 dsl_dataset_snapshot_arg_t *ddsa = arg;
1424 dsl_pool_t *dp = dmu_tx_pool(tx);
1425 nvpair_t *pair;
1426
1427 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL);
1428 pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) {
1429 dsl_dataset_t *ds;
1430 char *name, *atp;
1431 char dsname[MAXNAMELEN];
1432
1433 name = nvpair_name(pair);
1434 atp = strchr(name, '@');
1435 (void) strlcpy(dsname, name, atp - name + 1);
1436 VERIFY0(dsl_dataset_hold(dp, dsname, FTAG, &ds));
1437
1438 dsl_dataset_snapshot_sync_impl(ds, atp + 1, tx);
1439 if (ddsa->ddsa_props != NULL) {
1440 dsl_props_set_sync_impl(ds->ds_prev,
1441 ZPROP_SRC_LOCAL, ddsa->ddsa_props, tx);
1442 }
1443 zvol_create_minors(dp->dp_spa, nvpair_name(pair), B_TRUE);
1444 dsl_dataset_rele(ds, FTAG);
1445 }
1446 }
1447
1448 /*
1449 * The snapshots must all be in the same pool.
1450 * All-or-nothing: if there are any failures, nothing will be modified.
1451 */
1452 int
1453 dsl_dataset_snapshot(nvlist_t *snaps, nvlist_t *props, nvlist_t *errors)
1454 {
1455 dsl_dataset_snapshot_arg_t ddsa;
1456 nvpair_t *pair;
1457 boolean_t needsuspend;
1458 int error;
1459 spa_t *spa;
1460 char *firstname;
1461 nvlist_t *suspended = NULL;
1462
1463 pair = nvlist_next_nvpair(snaps, NULL);
1464 if (pair == NULL)
1465 return (0);
1466 firstname = nvpair_name(pair);
1467
1468 error = spa_open(firstname, &spa, FTAG);
1469 if (error != 0)
1470 return (error);
1471 needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP);
1472 spa_close(spa, FTAG);
1473
1474 if (needsuspend) {
1475 suspended = fnvlist_alloc();
1476 for (pair = nvlist_next_nvpair(snaps, NULL); pair != NULL;
1477 pair = nvlist_next_nvpair(snaps, pair)) {
1478 char fsname[MAXNAMELEN];
1479 char *snapname = nvpair_name(pair);
1480 char *atp;
1481 void *cookie;
1482
1483 atp = strchr(snapname, '@');
1484 if (atp == NULL) {
1485 error = SET_ERROR(EINVAL);
1486 break;
1487 }
1488 (void) strlcpy(fsname, snapname, atp - snapname + 1);
1489
1490 error = zil_suspend(fsname, &cookie);
1491 if (error != 0)
1492 break;
1493 fnvlist_add_uint64(suspended, fsname,
1494 (uintptr_t)cookie);
1495 }
1496 }
1497
1498 ddsa.ddsa_snaps = snaps;
1499 ddsa.ddsa_props = props;
1500 ddsa.ddsa_errors = errors;
1501 ddsa.ddsa_cr = CRED();
1502
1503 if (error == 0) {
1504 error = dsl_sync_task(firstname, dsl_dataset_snapshot_check,
1505 dsl_dataset_snapshot_sync, &ddsa,
1506 fnvlist_num_pairs(snaps) * 3, ZFS_SPACE_CHECK_NORMAL);
1507 }
1508
1509 if (suspended != NULL) {
1510 for (pair = nvlist_next_nvpair(suspended, NULL); pair != NULL;
1511 pair = nvlist_next_nvpair(suspended, pair)) {
1512 zil_resume((void *)(uintptr_t)
1513 fnvpair_value_uint64(pair));
1514 }
1515 fnvlist_free(suspended);
1516 }
1517
1518 return (error);
1519 }
1520
1521 typedef struct dsl_dataset_snapshot_tmp_arg {
1522 const char *ddsta_fsname;
1523 const char *ddsta_snapname;
1524 minor_t ddsta_cleanup_minor;
1525 const char *ddsta_htag;
1526 } dsl_dataset_snapshot_tmp_arg_t;
1527
1528 static int
1529 dsl_dataset_snapshot_tmp_check(void *arg, dmu_tx_t *tx)
1530 {
1531 dsl_dataset_snapshot_tmp_arg_t *ddsta = arg;
1532 dsl_pool_t *dp = dmu_tx_pool(tx);
1533 dsl_dataset_t *ds;
1534 int error;
1535
1536 error = dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds);
1537 if (error != 0)
1538 return (error);
1539
1540 /* NULL cred means no limit check for tmp snapshot */
1541 error = dsl_dataset_snapshot_check_impl(ds, ddsta->ddsta_snapname,
1542 tx, B_FALSE, 0, NULL);
1543 if (error != 0) {
1544 dsl_dataset_rele(ds, FTAG);
1545 return (error);
1546 }
1547
1548 if (spa_version(dp->dp_spa) < SPA_VERSION_USERREFS) {
1549 dsl_dataset_rele(ds, FTAG);
1550 return (SET_ERROR(ENOTSUP));
1551 }
1552 error = dsl_dataset_user_hold_check_one(NULL, ddsta->ddsta_htag,
1553 B_TRUE, tx);
1554 if (error != 0) {
1555 dsl_dataset_rele(ds, FTAG);
1556 return (error);
1557 }
1558
1559 dsl_dataset_rele(ds, FTAG);
1560 return (0);
1561 }
1562
1563 static void
1564 dsl_dataset_snapshot_tmp_sync(void *arg, dmu_tx_t *tx)
1565 {
1566 dsl_dataset_snapshot_tmp_arg_t *ddsta = arg;
1567 dsl_pool_t *dp = dmu_tx_pool(tx);
1568 dsl_dataset_t *ds;
1569
1570 VERIFY0(dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds));
1571
1572 dsl_dataset_snapshot_sync_impl(ds, ddsta->ddsta_snapname, tx);
1573 dsl_dataset_user_hold_sync_one(ds->ds_prev, ddsta->ddsta_htag,
1574 ddsta->ddsta_cleanup_minor, gethrestime_sec(), tx);
1575 dsl_destroy_snapshot_sync_impl(ds->ds_prev, B_TRUE, tx);
1576
1577 dsl_dataset_rele(ds, FTAG);
1578 }
1579
1580 int
1581 dsl_dataset_snapshot_tmp(const char *fsname, const char *snapname,
1582 minor_t cleanup_minor, const char *htag)
1583 {
1584 dsl_dataset_snapshot_tmp_arg_t ddsta;
1585 int error;
1586 spa_t *spa;
1587 boolean_t needsuspend;
1588 void *cookie;
1589
1590 ddsta.ddsta_fsname = fsname;
1591 ddsta.ddsta_snapname = snapname;
1592 ddsta.ddsta_cleanup_minor = cleanup_minor;
1593 ddsta.ddsta_htag = htag;
1594
1595 error = spa_open(fsname, &spa, FTAG);
1596 if (error != 0)
1597 return (error);
1598 needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP);
1599 spa_close(spa, FTAG);
1600
1601 if (needsuspend) {
1602 error = zil_suspend(fsname, &cookie);
1603 if (error != 0)
1604 return (error);
1605 }
1606
1607 error = dsl_sync_task(fsname, dsl_dataset_snapshot_tmp_check,
1608 dsl_dataset_snapshot_tmp_sync, &ddsta, 3, ZFS_SPACE_CHECK_RESERVED);
1609
1610 if (needsuspend)
1611 zil_resume(cookie);
1612 return (error);
1613 }
1614
1615
1616 void
1617 dsl_dataset_sync(dsl_dataset_t *ds, zio_t *zio, dmu_tx_t *tx)
1618 {
1619 spa_feature_t f;
1620
1621 ASSERT(dmu_tx_is_syncing(tx));
1622 ASSERT(ds->ds_objset != NULL);
1623 ASSERT(dsl_dataset_phys(ds)->ds_next_snap_obj == 0);
1624
1625 /*
1626 * in case we had to change ds_fsid_guid when we opened it,
1627 * sync it out now.
1628 */
1629 dmu_buf_will_dirty(ds->ds_dbuf, tx);
1630 dsl_dataset_phys(ds)->ds_fsid_guid = ds->ds_fsid_guid;
1631
1632 if (ds->ds_resume_bytes[tx->tx_txg & TXG_MASK] != 0) {
1633 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset,
1634 ds->ds_object, DS_FIELD_RESUME_OBJECT, 8, 1,
1635 &ds->ds_resume_object[tx->tx_txg & TXG_MASK], tx));
1636 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset,
1637 ds->ds_object, DS_FIELD_RESUME_OFFSET, 8, 1,
1638 &ds->ds_resume_offset[tx->tx_txg & TXG_MASK], tx));
1639 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset,
1640 ds->ds_object, DS_FIELD_RESUME_BYTES, 8, 1,
1641 &ds->ds_resume_bytes[tx->tx_txg & TXG_MASK], tx));
1642 ds->ds_resume_object[tx->tx_txg & TXG_MASK] = 0;
1643 ds->ds_resume_offset[tx->tx_txg & TXG_MASK] = 0;
1644 ds->ds_resume_bytes[tx->tx_txg & TXG_MASK] = 0;
1645 }
1646
1647 dmu_objset_sync(ds->ds_objset, zio, tx);
1648
1649 for (f = 0; f < SPA_FEATURES; f++) {
1650 if (ds->ds_feature_activation_needed[f]) {
1651 if (ds->ds_feature_inuse[f])
1652 continue;
1653 dsl_dataset_activate_feature(ds->ds_object, f, tx);
1654 ds->ds_feature_inuse[f] = B_TRUE;
1655 }
1656 }
1657 }
1658
1659 static void
1660 get_clones_stat(dsl_dataset_t *ds, nvlist_t *nv)
1661 {
1662 uint64_t count = 0;
1663 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
1664 zap_cursor_t zc;
1665 zap_attribute_t za;
1666 nvlist_t *propval = fnvlist_alloc();
1667 nvlist_t *val = fnvlist_alloc();
1668
1669 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool));
1670
1671 /*
1672 * There may be missing entries in ds_next_clones_obj
1673 * due to a bug in a previous version of the code.
1674 * Only trust it if it has the right number of entries.
1675 */
1676 if (dsl_dataset_phys(ds)->ds_next_clones_obj != 0) {
1677 VERIFY0(zap_count(mos, dsl_dataset_phys(ds)->ds_next_clones_obj,
1678 &count));
1679 }
1680 if (count != dsl_dataset_phys(ds)->ds_num_children - 1)
1681 goto fail;
1682 for (zap_cursor_init(&zc, mos,
1683 dsl_dataset_phys(ds)->ds_next_clones_obj);
1684 zap_cursor_retrieve(&zc, &za) == 0;
1685 zap_cursor_advance(&zc)) {
1686 dsl_dataset_t *clone;
1687 char buf[ZFS_MAXNAMELEN];
1688 VERIFY0(dsl_dataset_hold_obj(ds->ds_dir->dd_pool,
1689 za.za_first_integer, FTAG, &clone));
1690 dsl_dir_name(clone->ds_dir, buf);
1691 fnvlist_add_boolean(val, buf);
1692 dsl_dataset_rele(clone, FTAG);
1693 }
1694 zap_cursor_fini(&zc);
1695 fnvlist_add_nvlist(propval, ZPROP_VALUE, val);
1696 fnvlist_add_nvlist(nv, zfs_prop_to_name(ZFS_PROP_CLONES), propval);
1697 fail:
1698 nvlist_free(val);
1699 nvlist_free(propval);
1700 }
1701
1702 static void
1703 get_receive_resume_stats(dsl_dataset_t *ds, nvlist_t *nv)
1704 {
1705 dsl_pool_t *dp = ds->ds_dir->dd_pool;
1706
1707 if (dsl_dataset_has_resume_receive_state(ds)) {
1708 char *str;
1709 void *packed;
1710 uint8_t *compressed;
1711 uint64_t val;
1712 nvlist_t *token_nv = fnvlist_alloc();
1713 size_t packed_size, compressed_size;
1714 zio_cksum_t cksum;
1715 char *propval;
1716 char buf[MAXNAMELEN];
1717 int i;
1718
1719 if (zap_lookup(dp->dp_meta_objset, ds->ds_object,
1720 DS_FIELD_RESUME_FROMGUID, sizeof (val), 1, &val) == 0) {
1721 fnvlist_add_uint64(token_nv, "fromguid", val);
1722 }
1723 if (zap_lookup(dp->dp_meta_objset, ds->ds_object,
1724 DS_FIELD_RESUME_OBJECT, sizeof (val), 1, &val) == 0) {
1725 fnvlist_add_uint64(token_nv, "object", val);
1726 }
1727 if (zap_lookup(dp->dp_meta_objset, ds->ds_object,
1728 DS_FIELD_RESUME_OFFSET, sizeof (val), 1, &val) == 0) {
1729 fnvlist_add_uint64(token_nv, "offset", val);
1730 }
1731 if (zap_lookup(dp->dp_meta_objset, ds->ds_object,
1732 DS_FIELD_RESUME_BYTES, sizeof (val), 1, &val) == 0) {
1733 fnvlist_add_uint64(token_nv, "bytes", val);
1734 }
1735 if (zap_lookup(dp->dp_meta_objset, ds->ds_object,
1736 DS_FIELD_RESUME_TOGUID, sizeof (val), 1, &val) == 0) {
1737 fnvlist_add_uint64(token_nv, "toguid", val);
1738 }
1739 if (zap_lookup(dp->dp_meta_objset, ds->ds_object,
1740 DS_FIELD_RESUME_TONAME, 1, sizeof (buf), buf) == 0) {
1741 fnvlist_add_string(token_nv, "toname", buf);
1742 }
1743 if (zap_contains(dp->dp_meta_objset, ds->ds_object,
1744 DS_FIELD_RESUME_EMBEDOK) == 0) {
1745 fnvlist_add_boolean(token_nv, "embedok");
1746 }
1747 packed = fnvlist_pack(token_nv, &packed_size);
1748 fnvlist_free(token_nv);
1749 compressed = kmem_alloc(packed_size, KM_SLEEP);
1750
1751 compressed_size = gzip_compress(packed, compressed,
1752 packed_size, packed_size, 6);
1753
1754 fletcher_4_native(compressed, compressed_size, &cksum);
1755
1756 str = kmem_alloc(compressed_size * 2 + 1, KM_SLEEP);
1757 for (i = 0; i < compressed_size; i++) {
1758 (void) sprintf(str + i * 2, "%02x", compressed[i]);
1759 }
1760 str[compressed_size * 2] = '\0';
1761 propval = kmem_asprintf("%u-%llx-%llx-%s",
1762 ZFS_SEND_RESUME_TOKEN_VERSION,
1763 (longlong_t)cksum.zc_word[0],
1764 (longlong_t)packed_size, str);
1765 dsl_prop_nvlist_add_string(nv,
1766 ZFS_PROP_RECEIVE_RESUME_TOKEN, propval);
1767 kmem_free(packed, packed_size);
1768 kmem_free(str, compressed_size * 2 + 1);
1769 kmem_free(compressed, packed_size);
1770 strfree(propval);
1771 }
1772 }
1773
1774 void
1775 dsl_dataset_stats(dsl_dataset_t *ds, nvlist_t *nv)
1776 {
1777 dsl_pool_t *dp = ds->ds_dir->dd_pool;
1778 uint64_t refd, avail, uobjs, aobjs, ratio;
1779
1780 ASSERT(dsl_pool_config_held(dp));
1781
1782 ratio = dsl_dataset_phys(ds)->ds_compressed_bytes == 0 ? 100 :
1783 (dsl_dataset_phys(ds)->ds_uncompressed_bytes * 100 /
1784 dsl_dataset_phys(ds)->ds_compressed_bytes);
1785
1786 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRATIO, ratio);
1787 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_LOGICALREFERENCED,
1788 dsl_dataset_phys(ds)->ds_uncompressed_bytes);
1789
1790 if (ds->ds_is_snapshot) {
1791 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_COMPRESSRATIO, ratio);
1792 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USED,
1793 dsl_dataset_phys(ds)->ds_unique_bytes);
1794 get_clones_stat(ds, nv);
1795 } else {
1796 if (ds->ds_prev != NULL && ds->ds_prev != dp->dp_origin_snap) {
1797 char buf[MAXNAMELEN];
1798 dsl_dataset_name(ds->ds_prev, buf);
1799 dsl_prop_nvlist_add_string(nv, ZFS_PROP_PREV_SNAP, buf);
1800 }
1801
1802 dsl_dir_stats(ds->ds_dir, nv);
1803 }
1804
1805 dsl_dataset_space(ds, &refd, &avail, &uobjs, &aobjs);
1806 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_AVAILABLE, avail);
1807 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFERENCED, refd);
1808
1809 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATION,
1810 dsl_dataset_phys(ds)->ds_creation_time);
1811 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATETXG,
1812 dsl_dataset_phys(ds)->ds_creation_txg);
1813 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFQUOTA,
1814 ds->ds_quota);
1815 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRESERVATION,
1816 ds->ds_reserved);
1817 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_GUID,
1818 dsl_dataset_phys(ds)->ds_guid);
1819 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_UNIQUE,
1820 dsl_dataset_phys(ds)->ds_unique_bytes);
1821 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_OBJSETID,
1822 ds->ds_object);
1823 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USERREFS,
1824 ds->ds_userrefs);
1825 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_DEFER_DESTROY,
1826 DS_IS_DEFER_DESTROY(ds) ? 1 : 0);
1827
1828 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) {
1829 uint64_t written, comp, uncomp;
1830 dsl_pool_t *dp = ds->ds_dir->dd_pool;
1831 dsl_dataset_t *prev;
1832 int err;
1833
1834 err = dsl_dataset_hold_obj(dp,
1835 dsl_dataset_phys(ds)->ds_prev_snap_obj, FTAG, &prev);
1836 if (err == 0) {
1837 err = dsl_dataset_space_written(prev, ds, &written,
1838 &comp, &uncomp);
1839 dsl_dataset_rele(prev, FTAG);
1840 if (err == 0) {
1841 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_WRITTEN,
1842 written);
1843 }
1844 }
1845 }
1846
1847 if (!dsl_dataset_is_snapshot(ds)) {
1848 dsl_dataset_t *recv_ds;
1849 char recvname[ZFS_MAXNAMELEN];
1850
1851 /*
1852 * A failed "newfs" (e.g. full) resumable receive leaves
1853 * the stats set on this dataset. Check here for the prop.
1854 */
1855 get_receive_resume_stats(ds, nv);
1856
1857 /*
1858 * A failed incremental resumable receive leaves the
1859 * stats set on our child named "%recv". Check the child
1860 * for the prop.
1861 */
1862 dsl_dataset_name(ds, recvname);
1863 (void) strcat(recvname, "/");
1864 (void) strcat(recvname, recv_clone_name);
1865 if (dsl_dataset_hold(dp, recvname, FTAG, &recv_ds) == 0) {
1866 get_receive_resume_stats(recv_ds, nv);
1867 dsl_dataset_rele(recv_ds, FTAG);
1868 }
1869 }
1870 }
1871
1872 void
1873 dsl_dataset_fast_stat(dsl_dataset_t *ds, dmu_objset_stats_t *stat)
1874 {
1875 dsl_pool_t *dp = ds->ds_dir->dd_pool;
1876 ASSERT(dsl_pool_config_held(dp));
1877
1878 stat->dds_creation_txg = dsl_dataset_phys(ds)->ds_creation_txg;
1879 stat->dds_inconsistent =
1880 dsl_dataset_phys(ds)->ds_flags & DS_FLAG_INCONSISTENT;
1881 stat->dds_guid = dsl_dataset_phys(ds)->ds_guid;
1882 stat->dds_origin[0] = '\0';
1883 if (ds->ds_is_snapshot) {
1884 stat->dds_is_snapshot = B_TRUE;
1885 stat->dds_num_clones =
1886 dsl_dataset_phys(ds)->ds_num_children - 1;
1887 } else {
1888 stat->dds_is_snapshot = B_FALSE;
1889 stat->dds_num_clones = 0;
1890
1891 if (dsl_dir_is_clone(ds->ds_dir)) {
1892 dsl_dataset_t *ods;
1893
1894 VERIFY0(dsl_dataset_hold_obj(dp,
1895 dsl_dir_phys(ds->ds_dir)->dd_origin_obj,
1896 FTAG, &ods));
1897 dsl_dataset_name(ods, stat->dds_origin);
1898 dsl_dataset_rele(ods, FTAG);
1899 }
1900 }
1901 }
1902
1903 uint64_t
1904 dsl_dataset_fsid_guid(dsl_dataset_t *ds)
1905 {
1906 return (ds->ds_fsid_guid);
1907 }
1908
1909 void
1910 dsl_dataset_space(dsl_dataset_t *ds,
1911 uint64_t *refdbytesp, uint64_t *availbytesp,
1912 uint64_t *usedobjsp, uint64_t *availobjsp)
1913 {
1914 *refdbytesp = dsl_dataset_phys(ds)->ds_referenced_bytes;
1915 *availbytesp = dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE);
1916 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes)
1917 *availbytesp +=
1918 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes;
1919 if (ds->ds_quota != 0) {
1920 /*
1921 * Adjust available bytes according to refquota
1922 */
1923 if (*refdbytesp < ds->ds_quota)
1924 *availbytesp = MIN(*availbytesp,
1925 ds->ds_quota - *refdbytesp);
1926 else
1927 *availbytesp = 0;
1928 }
1929 *usedobjsp = BP_GET_FILL(&dsl_dataset_phys(ds)->ds_bp);
1930 *availobjsp = DN_MAX_OBJECT - *usedobjsp;
1931 }
1932
1933 boolean_t
1934 dsl_dataset_modified_since_snap(dsl_dataset_t *ds, dsl_dataset_t *snap)
1935 {
1936 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool));
1937 if (snap == NULL)
1938 return (B_FALSE);
1939 if (dsl_dataset_phys(ds)->ds_bp.blk_birth >
1940 dsl_dataset_phys(snap)->ds_creation_txg) {
1941 objset_t *os, *os_snap;
1942 /*
1943 * It may be that only the ZIL differs, because it was
1944 * reset in the head. Don't count that as being
1945 * modified.
1946 */
1947 if (dmu_objset_from_ds(ds, &os) != 0)
1948 return (B_TRUE);
1949 if (dmu_objset_from_ds(snap, &os_snap) != 0)
1950 return (B_TRUE);
1951 return (bcmp(&os->os_phys->os_meta_dnode,
1952 &os_snap->os_phys->os_meta_dnode,
1953 sizeof (os->os_phys->os_meta_dnode)) != 0);
1954 }
1955 return (B_FALSE);
1956 }
1957
1958 typedef struct dsl_dataset_rename_snapshot_arg {
1959 const char *ddrsa_fsname;
1960 const char *ddrsa_oldsnapname;
1961 const char *ddrsa_newsnapname;
1962 boolean_t ddrsa_recursive;
1963 dmu_tx_t *ddrsa_tx;
1964 } dsl_dataset_rename_snapshot_arg_t;
1965
1966 /* ARGSUSED */
1967 static int
1968 dsl_dataset_rename_snapshot_check_impl(dsl_pool_t *dp,
1969 dsl_dataset_t *hds, void *arg)
1970 {
1971 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg;
1972 int error;
1973 uint64_t val;
1974
1975 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val);
1976 if (error != 0) {
1977 /* ignore nonexistent snapshots */
1978 return (error == ENOENT ? 0 : error);
1979 }
1980
1981 /* new name should not exist */
1982 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_newsnapname, &val);
1983 if (error == 0)
1984 error = SET_ERROR(EEXIST);
1985 else if (error == ENOENT)
1986 error = 0;
1987
1988 /* dataset name + 1 for the "@" + the new snapshot name must fit */
1989 if (dsl_dir_namelen(hds->ds_dir) + 1 +
1990 strlen(ddrsa->ddrsa_newsnapname) >= MAXNAMELEN)
1991 error = SET_ERROR(ENAMETOOLONG);
1992
1993 return (error);
1994 }
1995
1996 static int
1997 dsl_dataset_rename_snapshot_check(void *arg, dmu_tx_t *tx)
1998 {
1999 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg;
2000 dsl_pool_t *dp = dmu_tx_pool(tx);
2001 dsl_dataset_t *hds;
2002 int error;
2003
2004 error = dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds);
2005 if (error != 0)
2006 return (error);
2007
2008 if (ddrsa->ddrsa_recursive) {
2009 error = dmu_objset_find_dp(dp, hds->ds_dir->dd_object,
2010 dsl_dataset_rename_snapshot_check_impl, ddrsa,
2011 DS_FIND_CHILDREN);
2012 } else {
2013 error = dsl_dataset_rename_snapshot_check_impl(dp, hds, ddrsa);
2014 }
2015 dsl_dataset_rele(hds, FTAG);
2016 return (error);
2017 }
2018
2019 static int
2020 dsl_dataset_rename_snapshot_sync_impl(dsl_pool_t *dp,
2021 dsl_dataset_t *hds, void *arg)
2022 {
2023 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg;
2024 dsl_dataset_t *ds;
2025 uint64_t val;
2026 dmu_tx_t *tx = ddrsa->ddrsa_tx;
2027 int error;
2028
2029 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val);
2030 ASSERT(error == 0 || error == ENOENT);
2031 if (error == ENOENT) {
2032 /* ignore nonexistent snapshots */
2033 return (0);
2034 }
2035
2036 VERIFY0(dsl_dataset_hold_obj(dp, val, FTAG, &ds));
2037
2038 /* log before we change the name */
2039 spa_history_log_internal_ds(ds, "rename", tx,
2040 "-> @%s", ddrsa->ddrsa_newsnapname);
2041
2042 VERIFY0(dsl_dataset_snap_remove(hds, ddrsa->ddrsa_oldsnapname, tx,
2043 B_FALSE));
2044 mutex_enter(&ds->ds_lock);
2045 (void) strcpy(ds->ds_snapname, ddrsa->ddrsa_newsnapname);
2046 mutex_exit(&ds->ds_lock);
2047 VERIFY0(zap_add(dp->dp_meta_objset,
2048 dsl_dataset_phys(hds)->ds_snapnames_zapobj,
2049 ds->ds_snapname, 8, 1, &ds->ds_object, tx));
2050 zvol_rename_minors(dp->dp_spa, ddrsa->ddrsa_oldsnapname,
2051 ddrsa->ddrsa_newsnapname, B_TRUE);
2052
2053 dsl_dataset_rele(ds, FTAG);
2054 return (0);
2055 }
2056
2057 static void
2058 dsl_dataset_rename_snapshot_sync(void *arg, dmu_tx_t *tx)
2059 {
2060 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg;
2061 dsl_pool_t *dp = dmu_tx_pool(tx);
2062 dsl_dataset_t *hds;
2063
2064 VERIFY0(dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds));
2065 ddrsa->ddrsa_tx = tx;
2066 if (ddrsa->ddrsa_recursive) {
2067 VERIFY0(dmu_objset_find_dp(dp, hds->ds_dir->dd_object,
2068 dsl_dataset_rename_snapshot_sync_impl, ddrsa,
2069 DS_FIND_CHILDREN));
2070 } else {
2071 VERIFY0(dsl_dataset_rename_snapshot_sync_impl(dp, hds, ddrsa));
2072 }
2073 dsl_dataset_rele(hds, FTAG);
2074 }
2075
2076 int
2077 dsl_dataset_rename_snapshot(const char *fsname,
2078 const char *oldsnapname, const char *newsnapname, boolean_t recursive)
2079 {
2080 dsl_dataset_rename_snapshot_arg_t ddrsa;
2081
2082 ddrsa.ddrsa_fsname = fsname;
2083 ddrsa.ddrsa_oldsnapname = oldsnapname;
2084 ddrsa.ddrsa_newsnapname = newsnapname;
2085 ddrsa.ddrsa_recursive = recursive;
2086
2087 return (dsl_sync_task(fsname, dsl_dataset_rename_snapshot_check,
2088 dsl_dataset_rename_snapshot_sync, &ddrsa,
2089 1, ZFS_SPACE_CHECK_RESERVED));
2090 }
2091
2092 /*
2093 * If we're doing an ownership handoff, we need to make sure that there is
2094 * only one long hold on the dataset. We're not allowed to change anything here
2095 * so we don't permanently release the long hold or regular hold here. We want
2096 * to do this only when syncing to avoid the dataset unexpectedly going away
2097 * when we release the long hold. Allow a long hold to exist for volumes, this
2098 * may occur when asynchronously registering the minor with the kernel.
2099 */
2100 static int
2101 dsl_dataset_handoff_check(dsl_dataset_t *ds, void *owner, dmu_tx_t *tx)
2102 {
2103 boolean_t held;
2104
2105 if (!dmu_tx_is_syncing(tx))
2106 return (0);
2107
2108 if (owner != NULL) {
2109 VERIFY3P(ds->ds_owner, ==, owner);
2110 dsl_dataset_long_rele(ds, owner);
2111 }
2112
2113 held = (dsl_dataset_long_held(ds) && (ds->ds_owner != zvol_tag));
2114
2115 if (owner != NULL)
2116 dsl_dataset_long_hold(ds, owner);
2117
2118 if (held)
2119 return (SET_ERROR(EBUSY));
2120
2121 return (0);
2122 }
2123
2124 typedef struct dsl_dataset_rollback_arg {
2125 const char *ddra_fsname;
2126 void *ddra_owner;
2127 nvlist_t *ddra_result;
2128 } dsl_dataset_rollback_arg_t;
2129
2130 static int
2131 dsl_dataset_rollback_check(void *arg, dmu_tx_t *tx)
2132 {
2133 dsl_dataset_rollback_arg_t *ddra = arg;
2134 dsl_pool_t *dp = dmu_tx_pool(tx);
2135 dsl_dataset_t *ds;
2136 int64_t unused_refres_delta;
2137 int error;
2138 nvpair_t *pair;
2139 nvlist_t *proprequest, *bookmarks;
2140
2141 error = dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds);
2142 if (error != 0)
2143 return (error);
2144
2145 /* must not be a snapshot */
2146 if (ds->ds_is_snapshot) {
2147 dsl_dataset_rele(ds, FTAG);
2148 return (SET_ERROR(EINVAL));
2149 }
2150
2151 /* must have a most recent snapshot */
2152 if (dsl_dataset_phys(ds)->ds_prev_snap_txg < TXG_INITIAL) {
2153 dsl_dataset_rele(ds, FTAG);
2154 return (SET_ERROR(EINVAL));
2155 }
2156
2157 /* must not have any bookmarks after the most recent snapshot */
2158 proprequest = fnvlist_alloc();
2159 fnvlist_add_boolean(proprequest, zfs_prop_to_name(ZFS_PROP_CREATETXG));
2160 bookmarks = fnvlist_alloc();
2161 error = dsl_get_bookmarks_impl(ds, proprequest, bookmarks);
2162 fnvlist_free(proprequest);
2163 if (error != 0)
2164 return (error);
2165 for (pair = nvlist_next_nvpair(bookmarks, NULL);
2166 pair != NULL; pair = nvlist_next_nvpair(bookmarks, pair)) {
2167 nvlist_t *valuenv =
2168 fnvlist_lookup_nvlist(fnvpair_value_nvlist(pair),
2169 zfs_prop_to_name(ZFS_PROP_CREATETXG));
2170 uint64_t createtxg = fnvlist_lookup_uint64(valuenv, "value");
2171 if (createtxg > dsl_dataset_phys(ds)->ds_prev_snap_txg) {
2172 fnvlist_free(bookmarks);
2173 dsl_dataset_rele(ds, FTAG);
2174 return (SET_ERROR(EEXIST));
2175 }
2176 }
2177 fnvlist_free(bookmarks);
2178
2179 error = dsl_dataset_handoff_check(ds, ddra->ddra_owner, tx);
2180 if (error != 0) {
2181 dsl_dataset_rele(ds, FTAG);
2182 return (error);
2183 }
2184
2185 /*
2186 * Check if the snap we are rolling back to uses more than
2187 * the refquota.
2188 */
2189 if (ds->ds_quota != 0 &&
2190 dsl_dataset_phys(ds->ds_prev)->ds_referenced_bytes > ds->ds_quota) {
2191 dsl_dataset_rele(ds, FTAG);
2192 return (SET_ERROR(EDQUOT));
2193 }
2194
2195 /*
2196 * When we do the clone swap, we will temporarily use more space
2197 * due to the refreservation (the head will no longer have any
2198 * unique space, so the entire amount of the refreservation will need
2199 * to be free). We will immediately destroy the clone, freeing
2200 * this space, but the freeing happens over many txg's.
2201 */
2202 unused_refres_delta = (int64_t)MIN(ds->ds_reserved,
2203 dsl_dataset_phys(ds)->ds_unique_bytes);
2204
2205 if (unused_refres_delta > 0 &&
2206 unused_refres_delta >
2207 dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE)) {
2208 dsl_dataset_rele(ds, FTAG);
2209 return (SET_ERROR(ENOSPC));
2210 }
2211
2212 dsl_dataset_rele(ds, FTAG);
2213 return (0);
2214 }
2215
2216 static void
2217 dsl_dataset_rollback_sync(void *arg, dmu_tx_t *tx)
2218 {
2219 dsl_dataset_rollback_arg_t *ddra = arg;
2220 dsl_pool_t *dp = dmu_tx_pool(tx);
2221 dsl_dataset_t *ds, *clone;
2222 uint64_t cloneobj;
2223 char namebuf[ZFS_MAXNAMELEN];
2224
2225 VERIFY0(dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds));
2226
2227 dsl_dataset_name(ds->ds_prev, namebuf);
2228 fnvlist_add_string(ddra->ddra_result, "target", namebuf);
2229
2230 cloneobj = dsl_dataset_create_sync(ds->ds_dir, "%rollback",
2231 ds->ds_prev, DS_CREATE_FLAG_NODIRTY, kcred, tx);
2232
2233 VERIFY0(dsl_dataset_hold_obj(dp, cloneobj, FTAG, &clone));
2234
2235 dsl_dataset_clone_swap_sync_impl(clone, ds, tx);
2236 dsl_dataset_zero_zil(ds, tx);
2237
2238 dsl_destroy_head_sync_impl(clone, tx);
2239
2240 dsl_dataset_rele(clone, FTAG);
2241 dsl_dataset_rele(ds, FTAG);
2242 }
2243
2244 /*
2245 * Rolls back the given filesystem or volume to the most recent snapshot.
2246 * The name of the most recent snapshot will be returned under key "target"
2247 * in the result nvlist.
2248 *
2249 * If owner != NULL:
2250 * - The existing dataset MUST be owned by the specified owner at entry
2251 * - Upon return, dataset will still be held by the same owner, whether we
2252 * succeed or not.
2253 *
2254 * This mode is required any time the existing filesystem is mounted. See
2255 * notes above zfs_suspend_fs() for further details.
2256 */
2257 int
2258 dsl_dataset_rollback(const char *fsname, void *owner, nvlist_t *result)
2259 {
2260 dsl_dataset_rollback_arg_t ddra;
2261
2262 ddra.ddra_fsname = fsname;
2263 ddra.ddra_owner = owner;
2264 ddra.ddra_result = result;
2265
2266 return (dsl_sync_task(fsname, dsl_dataset_rollback_check,
2267 dsl_dataset_rollback_sync, &ddra,
2268 1, ZFS_SPACE_CHECK_RESERVED));
2269 }
2270
2271 struct promotenode {
2272 list_node_t link;
2273 dsl_dataset_t *ds;
2274 };
2275
2276 typedef struct dsl_dataset_promote_arg {
2277 const char *ddpa_clonename;
2278 dsl_dataset_t *ddpa_clone;
2279 list_t shared_snaps, origin_snaps, clone_snaps;
2280 dsl_dataset_t *origin_origin; /* origin of the origin */
2281 uint64_t used, comp, uncomp, unique, cloneusedsnap, originusedsnap;
2282 char *err_ds;
2283 cred_t *cr;
2284 } dsl_dataset_promote_arg_t;
2285
2286 static int snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep);
2287 static int promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp,
2288 void *tag);
2289 static void promote_rele(dsl_dataset_promote_arg_t *ddpa, void *tag);
2290
2291 static int
2292 dsl_dataset_promote_check(void *arg, dmu_tx_t *tx)
2293 {
2294 dsl_dataset_promote_arg_t *ddpa = arg;
2295 dsl_pool_t *dp = dmu_tx_pool(tx);
2296 dsl_dataset_t *hds;
2297 struct promotenode *snap;
2298 dsl_dataset_t *origin_ds;
2299 int err;
2300 uint64_t unused;
2301 uint64_t ss_mv_cnt;
2302 size_t max_snap_len;
2303
2304 err = promote_hold(ddpa, dp, FTAG);
2305 if (err != 0)
2306 return (err);
2307
2308 hds = ddpa->ddpa_clone;
2309 max_snap_len = MAXNAMELEN - strlen(ddpa->ddpa_clonename) - 1;
2310
2311 if (dsl_dataset_phys(hds)->ds_flags & DS_FLAG_NOPROMOTE) {
2312 promote_rele(ddpa, FTAG);
2313 return (SET_ERROR(EXDEV));
2314 }
2315
2316 /*
2317 * Compute and check the amount of space to transfer. Since this is
2318 * so expensive, don't do the preliminary check.
2319 */
2320 if (!dmu_tx_is_syncing(tx)) {
2321 promote_rele(ddpa, FTAG);
2322 return (0);
2323 }
2324
2325 snap = list_head(&ddpa->shared_snaps);
2326 origin_ds = snap->ds;
2327
2328 /* compute origin's new unique space */
2329 snap = list_tail(&ddpa->clone_snaps);
2330 ASSERT3U(dsl_dataset_phys(snap->ds)->ds_prev_snap_obj, ==,
2331 origin_ds->ds_object);
2332 dsl_deadlist_space_range(&snap->ds->ds_deadlist,
2333 dsl_dataset_phys(origin_ds)->ds_prev_snap_txg, UINT64_MAX,
2334 &ddpa->unique, &unused, &unused);
2335
2336 /*
2337 * Walk the snapshots that we are moving
2338 *
2339 * Compute space to transfer. Consider the incremental changes
2340 * to used by each snapshot:
2341 * (my used) = (prev's used) + (blocks born) - (blocks killed)
2342 * So each snapshot gave birth to:
2343 * (blocks born) = (my used) - (prev's used) + (blocks killed)
2344 * So a sequence would look like:
2345 * (uN - u(N-1) + kN) + ... + (u1 - u0 + k1) + (u0 - 0 + k0)
2346 * Which simplifies to:
2347 * uN + kN + kN-1 + ... + k1 + k0
2348 * Note however, if we stop before we reach the ORIGIN we get:
2349 * uN + kN + kN-1 + ... + kM - uM-1
2350 */
2351 ss_mv_cnt = 0;
2352 ddpa->used = dsl_dataset_phys(origin_ds)->ds_referenced_bytes;
2353 ddpa->comp = dsl_dataset_phys(origin_ds)->ds_compressed_bytes;
2354 ddpa->uncomp = dsl_dataset_phys(origin_ds)->ds_uncompressed_bytes;
2355 for (snap = list_head(&ddpa->shared_snaps); snap;
2356 snap = list_next(&ddpa->shared_snaps, snap)) {
2357 uint64_t val, dlused, dlcomp, dluncomp;
2358 dsl_dataset_t *ds = snap->ds;
2359
2360 ss_mv_cnt++;
2361
2362 /*
2363 * If there are long holds, we won't be able to evict
2364 * the objset.
2365 */
2366 if (dsl_dataset_long_held(ds)) {
2367 err = SET_ERROR(EBUSY);
2368 goto out;
2369 }
2370
2371 /* Check that the snapshot name does not conflict */
2372 VERIFY0(dsl_dataset_get_snapname(ds));
2373 if (strlen(ds->ds_snapname) >= max_snap_len) {
2374 err = SET_ERROR(ENAMETOOLONG);
2375 goto out;
2376 }
2377 err = dsl_dataset_snap_lookup(hds, ds->ds_snapname, &val);
2378 if (err == 0) {
2379 (void) strcpy(ddpa->err_ds, snap->ds->ds_snapname);
2380 err = SET_ERROR(EEXIST);
2381 goto out;
2382 }
2383 if (err != ENOENT)
2384 goto out;
2385
2386 /* The very first snapshot does not have a deadlist */
2387 if (dsl_dataset_phys(ds)->ds_prev_snap_obj == 0)
2388 continue;
2389
2390 dsl_deadlist_space(&ds->ds_deadlist,
2391 &dlused, &dlcomp, &dluncomp);
2392 ddpa->used += dlused;
2393 ddpa->comp += dlcomp;
2394 ddpa->uncomp += dluncomp;
2395 }
2396
2397 /*
2398 * If we are a clone of a clone then we never reached ORIGIN,
2399 * so we need to subtract out the clone origin's used space.
2400 */
2401 if (ddpa->origin_origin) {
2402 ddpa->used -=
2403 dsl_dataset_phys(ddpa->origin_origin)->ds_referenced_bytes;
2404 ddpa->comp -=
2405 dsl_dataset_phys(ddpa->origin_origin)->ds_compressed_bytes;
2406 ddpa->uncomp -=
2407 dsl_dataset_phys(ddpa->origin_origin)->
2408 ds_uncompressed_bytes;
2409 }
2410
2411 /* Check that there is enough space and limit headroom here */
2412 err = dsl_dir_transfer_possible(origin_ds->ds_dir, hds->ds_dir,
2413 0, ss_mv_cnt, ddpa->used, ddpa->cr);
2414 if (err != 0)
2415 goto out;
2416
2417 /*
2418 * Compute the amounts of space that will be used by snapshots
2419 * after the promotion (for both origin and clone). For each,
2420 * it is the amount of space that will be on all of their
2421 * deadlists (that was not born before their new origin).
2422 */
2423 if (dsl_dir_phys(hds->ds_dir)->dd_flags & DD_FLAG_USED_BREAKDOWN) {
2424 uint64_t space;
2425
2426 /*
2427 * Note, typically this will not be a clone of a clone,
2428 * so dd_origin_txg will be < TXG_INITIAL, so
2429 * these snaplist_space() -> dsl_deadlist_space_range()
2430 * calls will be fast because they do not have to
2431 * iterate over all bps.
2432 */
2433 snap = list_head(&ddpa->origin_snaps);
2434 err = snaplist_space(&ddpa->shared_snaps,
2435 snap->ds->ds_dir->dd_origin_txg, &ddpa->cloneusedsnap);
2436 if (err != 0)
2437 goto out;
2438
2439 err = snaplist_space(&ddpa->clone_snaps,
2440 snap->ds->ds_dir->dd_origin_txg, &space);
2441 if (err != 0)
2442 goto out;
2443 ddpa->cloneusedsnap += space;
2444 }
2445 if (dsl_dir_phys(origin_ds->ds_dir)->dd_flags &
2446 DD_FLAG_USED_BREAKDOWN) {
2447 err = snaplist_space(&ddpa->origin_snaps,
2448 dsl_dataset_phys(origin_ds)->ds_creation_txg,
2449 &ddpa->originusedsnap);
2450 if (err != 0)
2451 goto out;
2452 }
2453
2454 out:
2455 promote_rele(ddpa, FTAG);
2456 return (err);
2457 }
2458
2459 static void
2460 dsl_dataset_promote_sync(void *arg, dmu_tx_t *tx)
2461 {
2462 dsl_dataset_promote_arg_t *ddpa = arg;
2463 dsl_pool_t *dp = dmu_tx_pool(tx);
2464 dsl_dataset_t *hds;
2465 struct promotenode *snap;
2466 dsl_dataset_t *origin_ds;
2467 dsl_dataset_t *origin_head;
2468 dsl_dir_t *dd;
2469 dsl_dir_t *odd = NULL;
2470 uint64_t oldnext_obj;
2471 int64_t delta;
2472
2473 VERIFY0(promote_hold(ddpa, dp, FTAG));
2474 hds = ddpa->ddpa_clone;
2475
2476 ASSERT0(dsl_dataset_phys(hds)->ds_flags & DS_FLAG_NOPROMOTE);
2477
2478 snap = list_head(&ddpa->shared_snaps);
2479 origin_ds = snap->ds;
2480 dd = hds->ds_dir;
2481
2482 snap = list_head(&ddpa->origin_snaps);
2483 origin_head = snap->ds;
2484
2485 /*
2486 * We need to explicitly open odd, since origin_ds's dd will be
2487 * changing.
2488 */
2489 VERIFY0(dsl_dir_hold_obj(dp, origin_ds->ds_dir->dd_object,
2490 NULL, FTAG, &odd));
2491
2492 /* change origin's next snap */
2493 dmu_buf_will_dirty(origin_ds->ds_dbuf, tx);
2494 oldnext_obj = dsl_dataset_phys(origin_ds)->ds_next_snap_obj;
2495 snap = list_tail(&ddpa->clone_snaps);
2496 ASSERT3U(dsl_dataset_phys(snap->ds)->ds_prev_snap_obj, ==,
2497 origin_ds->ds_object);
2498 dsl_dataset_phys(origin_ds)->ds_next_snap_obj = snap->ds->ds_object;
2499
2500 /* change the origin's next clone */
2501 if (dsl_dataset_phys(origin_ds)->ds_next_clones_obj) {
2502 dsl_dataset_remove_from_next_clones(origin_ds,
2503 snap->ds->ds_object, tx);
2504 VERIFY0(zap_add_int(dp->dp_meta_objset,
2505 dsl_dataset_phys(origin_ds)->ds_next_clones_obj,
2506 oldnext_obj, tx));
2507 }
2508
2509 /* change origin */
2510 dmu_buf_will_dirty(dd->dd_dbuf, tx);
2511 ASSERT3U(dsl_dir_phys(dd)->dd_origin_obj, ==, origin_ds->ds_object);
2512 dsl_dir_phys(dd)->dd_origin_obj = dsl_dir_phys(odd)->dd_origin_obj;
2513 dd->dd_origin_txg = origin_head->ds_dir->dd_origin_txg;
2514 dmu_buf_will_dirty(odd->dd_dbuf, tx);
2515 dsl_dir_phys(odd)->dd_origin_obj = origin_ds->ds_object;
2516 origin_head->ds_dir->dd_origin_txg =
2517 dsl_dataset_phys(origin_ds)->ds_creation_txg;
2518
2519 /* change dd_clone entries */
2520 if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) {
2521 VERIFY0(zap_remove_int(dp->dp_meta_objset,
2522 dsl_dir_phys(odd)->dd_clones, hds->ds_object, tx));
2523 VERIFY0(zap_add_int(dp->dp_meta_objset,
2524 dsl_dir_phys(ddpa->origin_origin->ds_dir)->dd_clones,
2525 hds->ds_object, tx));
2526
2527 VERIFY0(zap_remove_int(dp->dp_meta_objset,
2528 dsl_dir_phys(ddpa->origin_origin->ds_dir)->dd_clones,
2529 origin_head->ds_object, tx));
2530 if (dsl_dir_phys(dd)->dd_clones == 0) {
2531 dsl_dir_phys(dd)->dd_clones =
2532 zap_create(dp->dp_meta_objset, DMU_OT_DSL_CLONES,
2533 DMU_OT_NONE, 0, tx);
2534 }
2535 VERIFY0(zap_add_int(dp->dp_meta_objset,
2536 dsl_dir_phys(dd)->dd_clones, origin_head->ds_object, tx));
2537 }
2538
2539 /* move snapshots to this dir */
2540 for (snap = list_head(&ddpa->shared_snaps); snap;
2541 snap = list_next(&ddpa->shared_snaps, snap)) {
2542 dsl_dataset_t *ds = snap->ds;
2543
2544 /*
2545 * Property callbacks are registered to a particular
2546 * dsl_dir. Since ours is changing, evict the objset
2547 * so that they will be unregistered from the old dsl_dir.
2548 */
2549 if (ds->ds_objset) {
2550 dmu_objset_evict(ds->ds_objset);
2551 ds->ds_objset = NULL;
2552 }
2553
2554 /* move snap name entry */
2555 VERIFY0(dsl_dataset_get_snapname(ds));
2556 VERIFY0(dsl_dataset_snap_remove(origin_head,
2557 ds->ds_snapname, tx, B_TRUE));
2558 VERIFY0(zap_add(dp->dp_meta_objset,
2559 dsl_dataset_phys(hds)->ds_snapnames_zapobj, ds->ds_snapname,
2560 8, 1, &ds->ds_object, tx));
2561 dsl_fs_ss_count_adjust(hds->ds_dir, 1,
2562 DD_FIELD_SNAPSHOT_COUNT, tx);
2563
2564 /* change containing dsl_dir */
2565 dmu_buf_will_dirty(ds->ds_dbuf, tx);
2566 ASSERT3U(dsl_dataset_phys(ds)->ds_dir_obj, ==, odd->dd_object);
2567 dsl_dataset_phys(ds)->ds_dir_obj = dd->dd_object;
2568 ASSERT3P(ds->ds_dir, ==, odd);
2569 dsl_dir_rele(ds->ds_dir, ds);
2570 VERIFY0(dsl_dir_hold_obj(dp, dd->dd_object,
2571 NULL, ds, &ds->ds_dir));
2572
2573 /* move any clone references */
2574 if (dsl_dataset_phys(ds)->ds_next_clones_obj &&
2575 spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) {
2576 zap_cursor_t zc;
2577 zap_attribute_t za;
2578
2579 for (zap_cursor_init(&zc, dp->dp_meta_objset,
2580 dsl_dataset_phys(ds)->ds_next_clones_obj);
2581 zap_cursor_retrieve(&zc, &za) == 0;
2582 zap_cursor_advance(&zc)) {
2583 dsl_dataset_t *cnds;
2584 uint64_t o;
2585
2586 if (za.za_first_integer == oldnext_obj) {
2587 /*
2588 * We've already moved the
2589 * origin's reference.
2590 */
2591 continue;
2592 }
2593
2594 VERIFY0(dsl_dataset_hold_obj(dp,
2595 za.za_first_integer, FTAG, &cnds));
2596 o = dsl_dir_phys(cnds->ds_dir)->
2597 dd_head_dataset_obj;
2598
2599 VERIFY0(zap_remove_int(dp->dp_meta_objset,
2600 dsl_dir_phys(odd)->dd_clones, o, tx));
2601 VERIFY0(zap_add_int(dp->dp_meta_objset,
2602 dsl_dir_phys(dd)->dd_clones, o, tx));
2603 dsl_dataset_rele(cnds, FTAG);
2604 }
2605 zap_cursor_fini(&zc);
2606 }
2607
2608 ASSERT(!dsl_prop_hascb(ds));
2609 }
2610
2611 /*
2612 * Change space accounting.
2613 * Note, pa->*usedsnap and dd_used_breakdown[SNAP] will either
2614 * both be valid, or both be 0 (resulting in delta == 0). This
2615 * is true for each of {clone,origin} independently.
2616 */
2617
2618 delta = ddpa->cloneusedsnap -
2619 dsl_dir_phys(dd)->dd_used_breakdown[DD_USED_SNAP];
2620 ASSERT3S(delta, >=, 0);
2621 ASSERT3U(ddpa->used, >=, delta);
2622 dsl_dir_diduse_space(dd, DD_USED_SNAP, delta, 0, 0, tx);
2623 dsl_dir_diduse_space(dd, DD_USED_HEAD,
2624 ddpa->used - delta, ddpa->comp, ddpa->uncomp, tx);
2625
2626 delta = ddpa->originusedsnap -
2627 dsl_dir_phys(odd)->dd_used_breakdown[DD_USED_SNAP];
2628 ASSERT3S(delta, <=, 0);
2629 ASSERT3U(ddpa->used, >=, -delta);
2630 dsl_dir_diduse_space(odd, DD_USED_SNAP, delta, 0, 0, tx);
2631 dsl_dir_diduse_space(odd, DD_USED_HEAD,
2632 -ddpa->used - delta, -ddpa->comp, -ddpa->uncomp, tx);
2633
2634 dsl_dataset_phys(origin_ds)->ds_unique_bytes = ddpa->unique;
2635
2636 /* log history record */
2637 spa_history_log_internal_ds(hds, "promote", tx, "");
2638
2639 dsl_dir_rele(odd, FTAG);
2640 promote_rele(ddpa, FTAG);
2641 }
2642
2643 /*
2644 * Make a list of dsl_dataset_t's for the snapshots between first_obj
2645 * (exclusive) and last_obj (inclusive). The list will be in reverse
2646 * order (last_obj will be the list_head()). If first_obj == 0, do all
2647 * snapshots back to this dataset's origin.
2648 */
2649 static int
2650 snaplist_make(dsl_pool_t *dp,
2651 uint64_t first_obj, uint64_t last_obj, list_t *l, void *tag)
2652 {
2653 uint64_t obj = last_obj;
2654
2655 list_create(l, sizeof (struct promotenode),
2656 offsetof(struct promotenode, link));
2657
2658 while (obj != first_obj) {
2659 dsl_dataset_t *ds;
2660 struct promotenode *snap;
2661 int err;
2662
2663 err = dsl_dataset_hold_obj(dp, obj, tag, &ds);
2664 ASSERT(err != ENOENT);
2665 if (err != 0)
2666 return (err);
2667
2668 if (first_obj == 0)
2669 first_obj = dsl_dir_phys(ds->ds_dir)->dd_origin_obj;
2670
2671 snap = kmem_alloc(sizeof (*snap), KM_SLEEP);
2672 snap->ds = ds;
2673 list_insert_tail(l, snap);
2674 obj = dsl_dataset_phys(ds)->ds_prev_snap_obj;
2675 }
2676
2677 return (0);
2678 }
2679
2680 static int
2681 snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep)
2682 {
2683 struct promotenode *snap;
2684
2685 *spacep = 0;
2686 for (snap = list_head(l); snap; snap = list_next(l, snap)) {
2687 uint64_t used, comp, uncomp;
2688 dsl_deadlist_space_range(&snap->ds->ds_deadlist,
2689 mintxg, UINT64_MAX, &used, &comp, &uncomp);
2690 *spacep += used;
2691 }
2692 return (0);
2693 }
2694
2695 static void
2696 snaplist_destroy(list_t *l, void *tag)
2697 {
2698 struct promotenode *snap;
2699
2700 if (l == NULL || !list_link_active(&l->list_head))
2701 return;
2702
2703 while ((snap = list_tail(l)) != NULL) {
2704 list_remove(l, snap);
2705 dsl_dataset_rele(snap->ds, tag);
2706 kmem_free(snap, sizeof (*snap));
2707 }
2708 list_destroy(l);
2709 }
2710
2711 static int
2712 promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp, void *tag)
2713 {
2714 int error;
2715 dsl_dir_t *dd;
2716 struct promotenode *snap;
2717
2718 error = dsl_dataset_hold(dp, ddpa->ddpa_clonename, tag,
2719 &ddpa->ddpa_clone);
2720 if (error != 0)
2721 return (error);
2722 dd = ddpa->ddpa_clone->ds_dir;
2723
2724 if (ddpa->ddpa_clone->ds_is_snapshot ||
2725 !dsl_dir_is_clone(dd)) {
2726 dsl_dataset_rele(ddpa->ddpa_clone, tag);
2727 return (SET_ERROR(EINVAL));
2728 }
2729
2730 error = snaplist_make(dp, 0, dsl_dir_phys(dd)->dd_origin_obj,
2731 &ddpa->shared_snaps, tag);
2732 if (error != 0)
2733 goto out;
2734
2735 error = snaplist_make(dp, 0, ddpa->ddpa_clone->ds_object,
2736 &ddpa->clone_snaps, tag);
2737 if (error != 0)
2738 goto out;
2739
2740 snap = list_head(&ddpa->shared_snaps);
2741 ASSERT3U(snap->ds->ds_object, ==, dsl_dir_phys(dd)->dd_origin_obj);
2742 error = snaplist_make(dp, dsl_dir_phys(dd)->dd_origin_obj,
2743 dsl_dir_phys(snap->ds->ds_dir)->dd_head_dataset_obj,
2744 &ddpa->origin_snaps, tag);
2745 if (error != 0)
2746 goto out;
2747
2748 if (dsl_dir_phys(snap->ds->ds_dir)->dd_origin_obj != 0) {
2749 error = dsl_dataset_hold_obj(dp,
2750 dsl_dir_phys(snap->ds->ds_dir)->dd_origin_obj,
2751 tag, &ddpa->origin_origin);
2752 if (error != 0)
2753 goto out;
2754 }
2755 out:
2756 if (error != 0)
2757 promote_rele(ddpa, tag);
2758 return (error);
2759 }
2760
2761 static void
2762 promote_rele(dsl_dataset_promote_arg_t *ddpa, void *tag)
2763 {
2764 snaplist_destroy(&ddpa->shared_snaps, tag);
2765 snaplist_destroy(&ddpa->clone_snaps, tag);
2766 snaplist_destroy(&ddpa->origin_snaps, tag);
2767 if (ddpa->origin_origin != NULL)
2768 dsl_dataset_rele(ddpa->origin_origin, tag);
2769 dsl_dataset_rele(ddpa->ddpa_clone, tag);
2770 }
2771
2772 /*
2773 * Promote a clone.
2774 *
2775 * If it fails due to a conflicting snapshot name, "conflsnap" will be filled
2776 * in with the name. (It must be at least MAXNAMELEN bytes long.)
2777 */
2778 int
2779 dsl_dataset_promote(const char *name, char *conflsnap)
2780 {
2781 dsl_dataset_promote_arg_t ddpa = { 0 };
2782 uint64_t numsnaps;
2783 int error;
2784 objset_t *os;
2785
2786 /*
2787 * We will modify space proportional to the number of
2788 * snapshots. Compute numsnaps.
2789 */
2790 error = dmu_objset_hold(name, FTAG, &os);
2791 if (error != 0)
2792 return (error);
2793 error = zap_count(dmu_objset_pool(os)->dp_meta_objset,
2794 dsl_dataset_phys(dmu_objset_ds(os))->ds_snapnames_zapobj,
2795 &numsnaps);
2796 dmu_objset_rele(os, FTAG);
2797 if (error != 0)
2798 return (error);
2799
2800 ddpa.ddpa_clonename = name;
2801 ddpa.err_ds = conflsnap;
2802 ddpa.cr = CRED();
2803
2804 return (dsl_sync_task(name, dsl_dataset_promote_check,
2805 dsl_dataset_promote_sync, &ddpa,
2806 2 + numsnaps, ZFS_SPACE_CHECK_RESERVED));
2807 }
2808
2809 int
2810 dsl_dataset_clone_swap_check_impl(dsl_dataset_t *clone,
2811 dsl_dataset_t *origin_head, boolean_t force, void *owner, dmu_tx_t *tx)
2812 {
2813 int64_t unused_refres_delta;
2814
2815 /* they should both be heads */
2816 if (clone->ds_is_snapshot ||
2817 origin_head->ds_is_snapshot)
2818 return (SET_ERROR(EINVAL));
2819
2820 /* if we are not forcing, the branch point should be just before them */
2821 if (!force && clone->ds_prev != origin_head->ds_prev)
2822 return (SET_ERROR(EINVAL));
2823
2824 /* clone should be the clone (unless they are unrelated) */
2825 if (clone->ds_prev != NULL &&
2826 clone->ds_prev != clone->ds_dir->dd_pool->dp_origin_snap &&
2827 origin_head->ds_dir != clone->ds_prev->ds_dir)
2828 return (SET_ERROR(EINVAL));
2829
2830 /* the clone should be a child of the origin */
2831 if (clone->ds_dir->dd_parent != origin_head->ds_dir)
2832 return (SET_ERROR(EINVAL));
2833
2834 /* origin_head shouldn't be modified unless 'force' */
2835 if (!force &&
2836 dsl_dataset_modified_since_snap(origin_head, origin_head->ds_prev))
2837 return (SET_ERROR(ETXTBSY));
2838
2839 /* origin_head should have no long holds (e.g. is not mounted) */
2840 if (dsl_dataset_handoff_check(origin_head, owner, tx))
2841 return (SET_ERROR(EBUSY));
2842
2843 /* check amount of any unconsumed refreservation */
2844 unused_refres_delta =
2845 (int64_t)MIN(origin_head->ds_reserved,
2846 dsl_dataset_phys(origin_head)->ds_unique_bytes) -
2847 (int64_t)MIN(origin_head->ds_reserved,
2848 dsl_dataset_phys(clone)->ds_unique_bytes);
2849
2850 if (unused_refres_delta > 0 &&
2851 unused_refres_delta >
2852 dsl_dir_space_available(origin_head->ds_dir, NULL, 0, TRUE))
2853 return (SET_ERROR(ENOSPC));
2854
2855 /* clone can't be over the head's refquota */
2856 if (origin_head->ds_quota != 0 &&
2857 dsl_dataset_phys(clone)->ds_referenced_bytes >
2858 origin_head->ds_quota)
2859 return (SET_ERROR(EDQUOT));
2860
2861 return (0);
2862 }
2863
2864 void
2865 dsl_dataset_clone_swap_sync_impl(dsl_dataset_t *clone,
2866 dsl_dataset_t *origin_head, dmu_tx_t *tx)
2867 {
2868 spa_feature_t f;
2869 dsl_pool_t *dp = dmu_tx_pool(tx);
2870 int64_t unused_refres_delta;
2871
2872 ASSERT(clone->ds_reserved == 0);
2873 ASSERT(origin_head->ds_quota == 0 ||
2874 dsl_dataset_phys(clone)->ds_unique_bytes <= origin_head->ds_quota);
2875 ASSERT3P(clone->ds_prev, ==, origin_head->ds_prev);
2876
2877 /*
2878 * Swap per-dataset feature flags.
2879 */
2880 for (f = 0; f < SPA_FEATURES; f++) {
2881 boolean_t clone_inuse;
2882 boolean_t origin_head_inuse;
2883
2884 if (!(spa_feature_table[f].fi_flags &
2885 ZFEATURE_FLAG_PER_DATASET)) {
2886 ASSERT(!clone->ds_feature_inuse[f]);
2887 ASSERT(!origin_head->ds_feature_inuse[f]);
2888 continue;
2889 }
2890
2891 clone_inuse = clone->ds_feature_inuse[f];
2892 origin_head_inuse = origin_head->ds_feature_inuse[f];
2893
2894 if (clone_inuse) {
2895 dsl_dataset_deactivate_feature(clone->ds_object, f, tx);
2896 clone->ds_feature_inuse[f] = B_FALSE;
2897 }
2898 if (origin_head_inuse) {
2899 dsl_dataset_deactivate_feature(origin_head->ds_object,
2900 f, tx);
2901 origin_head->ds_feature_inuse[f] = B_FALSE;
2902 }
2903 if (clone_inuse) {
2904 dsl_dataset_activate_feature(origin_head->ds_object,
2905 f, tx);
2906 origin_head->ds_feature_inuse[f] = B_TRUE;
2907 }
2908 if (origin_head_inuse) {
2909 dsl_dataset_activate_feature(clone->ds_object, f, tx);
2910 clone->ds_feature_inuse[f] = B_TRUE;
2911 }
2912 }
2913
2914 dmu_buf_will_dirty(clone->ds_dbuf, tx);
2915 dmu_buf_will_dirty(origin_head->ds_dbuf, tx);
2916
2917 if (clone->ds_objset != NULL) {
2918 dmu_objset_evict(clone->ds_objset);
2919 clone->ds_objset = NULL;
2920 }
2921
2922 if (origin_head->ds_objset != NULL) {
2923 dmu_objset_evict(origin_head->ds_objset);
2924 origin_head->ds_objset = NULL;
2925 }
2926
2927 unused_refres_delta =
2928 (int64_t)MIN(origin_head->ds_reserved,
2929 dsl_dataset_phys(origin_head)->ds_unique_bytes) -
2930 (int64_t)MIN(origin_head->ds_reserved,
2931 dsl_dataset_phys(clone)->ds_unique_bytes);
2932
2933 /*
2934 * Reset origin's unique bytes, if it exists.
2935 */
2936 if (clone->ds_prev) {
2937 dsl_dataset_t *origin = clone->ds_prev;
2938 uint64_t comp, uncomp;
2939
2940 dmu_buf_will_dirty(origin->ds_dbuf, tx);
2941 dsl_deadlist_space_range(&clone->ds_deadlist,
2942 dsl_dataset_phys(origin)->ds_prev_snap_txg, UINT64_MAX,
2943 &dsl_dataset_phys(origin)->ds_unique_bytes, &comp, &uncomp);
2944 }
2945
2946 /* swap blkptrs */
2947 {
2948 blkptr_t tmp;
2949 tmp = dsl_dataset_phys(origin_head)->ds_bp;
2950 dsl_dataset_phys(origin_head)->ds_bp =
2951 dsl_dataset_phys(clone)->ds_bp;
2952 dsl_dataset_phys(clone)->ds_bp = tmp;
2953 }
2954
2955 /* set dd_*_bytes */
2956 {
2957 int64_t dused, dcomp, duncomp;
2958 uint64_t cdl_used, cdl_comp, cdl_uncomp;
2959 uint64_t odl_used, odl_comp, odl_uncomp;
2960
2961 ASSERT3U(dsl_dir_phys(clone->ds_dir)->
2962 dd_used_breakdown[DD_USED_SNAP], ==, 0);
2963
2964 dsl_deadlist_space(&clone->ds_deadlist,
2965 &cdl_used, &cdl_comp, &cdl_uncomp);
2966 dsl_deadlist_space(&origin_head->ds_deadlist,
2967 &odl_used, &odl_comp, &odl_uncomp);
2968
2969 dused = dsl_dataset_phys(clone)->ds_referenced_bytes +
2970 cdl_used -
2971 (dsl_dataset_phys(origin_head)->ds_referenced_bytes +
2972 odl_used);
2973 dcomp = dsl_dataset_phys(clone)->ds_compressed_bytes +
2974 cdl_comp -
2975 (dsl_dataset_phys(origin_head)->ds_compressed_bytes +
2976 odl_comp);
2977 duncomp = dsl_dataset_phys(clone)->ds_uncompressed_bytes +
2978 cdl_uncomp -
2979 (dsl_dataset_phys(origin_head)->ds_uncompressed_bytes +
2980 odl_uncomp);
2981
2982 dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_HEAD,
2983 dused, dcomp, duncomp, tx);
2984 dsl_dir_diduse_space(clone->ds_dir, DD_USED_HEAD,
2985 -dused, -dcomp, -duncomp, tx);
2986
2987 /*
2988 * The difference in the space used by snapshots is the
2989 * difference in snapshot space due to the head's
2990 * deadlist (since that's the only thing that's
2991 * changing that affects the snapused).
2992 */
2993 dsl_deadlist_space_range(&clone->ds_deadlist,
2994 origin_head->ds_dir->dd_origin_txg, UINT64_MAX,
2995 &cdl_used, &cdl_comp, &cdl_uncomp);
2996 dsl_deadlist_space_range(&origin_head->ds_deadlist,
2997 origin_head->ds_dir->dd_origin_txg, UINT64_MAX,
2998 &odl_used, &odl_comp, &odl_uncomp);
2999 dsl_dir_transfer_space(origin_head->ds_dir, cdl_used - odl_used,
3000 DD_USED_HEAD, DD_USED_SNAP, tx);
3001 }
3002
3003 /* swap ds_*_bytes */
3004 SWITCH64(dsl_dataset_phys(origin_head)->ds_referenced_bytes,
3005 dsl_dataset_phys(clone)->ds_referenced_bytes);
3006 SWITCH64(dsl_dataset_phys(origin_head)->ds_compressed_bytes,
3007 dsl_dataset_phys(clone)->ds_compressed_bytes);
3008 SWITCH64(dsl_dataset_phys(origin_head)->ds_uncompressed_bytes,
3009 dsl_dataset_phys(clone)->ds_uncompressed_bytes);
3010 SWITCH64(dsl_dataset_phys(origin_head)->ds_unique_bytes,
3011 dsl_dataset_phys(clone)->ds_unique_bytes);
3012
3013 /* apply any parent delta for change in unconsumed refreservation */
3014 dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_REFRSRV,
3015 unused_refres_delta, 0, 0, tx);
3016
3017 /*
3018 * Swap deadlists.
3019 */
3020 dsl_deadlist_close(&clone->ds_deadlist);
3021 dsl_deadlist_close(&origin_head->ds_deadlist);
3022 SWITCH64(dsl_dataset_phys(origin_head)->ds_deadlist_obj,
3023 dsl_dataset_phys(clone)->ds_deadlist_obj);
3024 dsl_deadlist_open(&clone->ds_deadlist, dp->dp_meta_objset,
3025 dsl_dataset_phys(clone)->ds_deadlist_obj);
3026 dsl_deadlist_open(&origin_head->ds_deadlist, dp->dp_meta_objset,
3027 dsl_dataset_phys(origin_head)->ds_deadlist_obj);
3028
3029 dsl_scan_ds_clone_swapped(origin_head, clone, tx);
3030
3031 spa_history_log_internal_ds(clone, "clone swap", tx,
3032 "parent=%s", origin_head->ds_dir->dd_myname);
3033 }
3034
3035 /*
3036 * Given a pool name and a dataset object number in that pool,
3037 * return the name of that dataset.
3038 */
3039 int
3040 dsl_dsobj_to_dsname(char *pname, uint64_t obj, char *buf)
3041 {
3042 dsl_pool_t *dp;
3043 dsl_dataset_t *ds;
3044 int error;
3045
3046 error = dsl_pool_hold(pname, FTAG, &dp);
3047 if (error != 0)
3048 return (error);
3049
3050 error = dsl_dataset_hold_obj(dp, obj, FTAG, &ds);
3051 if (error == 0) {
3052 dsl_dataset_name(ds, buf);
3053 dsl_dataset_rele(ds, FTAG);
3054 }
3055 dsl_pool_rele(dp, FTAG);
3056
3057 return (error);
3058 }
3059
3060 int
3061 dsl_dataset_check_quota(dsl_dataset_t *ds, boolean_t check_quota,
3062 uint64_t asize, uint64_t inflight, uint64_t *used, uint64_t *ref_rsrv)
3063 {
3064 int error = 0;
3065
3066 ASSERT3S(asize, >, 0);
3067
3068 /*
3069 * *ref_rsrv is the portion of asize that will come from any
3070 * unconsumed refreservation space.
3071 */
3072 *ref_rsrv = 0;
3073
3074 mutex_enter(&ds->ds_lock);
3075 /*
3076 * Make a space adjustment for reserved bytes.
3077 */
3078 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes) {
3079 ASSERT3U(*used, >=,
3080 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes);
3081 *used -=
3082 (ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes);
3083 *ref_rsrv =
3084 asize - MIN(asize, parent_delta(ds, asize + inflight));
3085 }
3086
3087 if (!check_quota || ds->ds_quota == 0) {
3088 mutex_exit(&ds->ds_lock);
3089 return (0);
3090 }
3091 /*
3092 * If they are requesting more space, and our current estimate
3093 * is over quota, they get to try again unless the actual
3094 * on-disk is over quota and there are no pending changes (which
3095 * may free up space for us).
3096 */
3097 if (dsl_dataset_phys(ds)->ds_referenced_bytes + inflight >=
3098 ds->ds_quota) {
3099 if (inflight > 0 ||
3100 dsl_dataset_phys(ds)->ds_referenced_bytes < ds->ds_quota)
3101 error = SET_ERROR(ERESTART);
3102 else
3103 error = SET_ERROR(EDQUOT);
3104 }
3105 mutex_exit(&ds->ds_lock);
3106
3107 return (error);
3108 }
3109
3110 typedef struct dsl_dataset_set_qr_arg {
3111 const char *ddsqra_name;
3112 zprop_source_t ddsqra_source;
3113 uint64_t ddsqra_value;
3114 } dsl_dataset_set_qr_arg_t;
3115
3116
3117 /* ARGSUSED */
3118 static int
3119 dsl_dataset_set_refquota_check(void *arg, dmu_tx_t *tx)
3120 {
3121 dsl_dataset_set_qr_arg_t *ddsqra = arg;
3122 dsl_pool_t *dp = dmu_tx_pool(tx);
3123 dsl_dataset_t *ds;
3124 int error;
3125 uint64_t newval;
3126
3127 if (spa_version(dp->dp_spa) < SPA_VERSION_REFQUOTA)
3128 return (SET_ERROR(ENOTSUP));
3129
3130 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds);
3131 if (error != 0)
3132 return (error);
3133
3134 if (ds->ds_is_snapshot) {
3135 dsl_dataset_rele(ds, FTAG);
3136 return (SET_ERROR(EINVAL));
3137 }
3138
3139 error = dsl_prop_predict(ds->ds_dir,
3140 zfs_prop_to_name(ZFS_PROP_REFQUOTA),
3141 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval);
3142 if (error != 0) {
3143 dsl_dataset_rele(ds, FTAG);
3144 return (error);
3145 }
3146
3147 if (newval == 0) {
3148 dsl_dataset_rele(ds, FTAG);
3149 return (0);
3150 }
3151
3152 if (newval < dsl_dataset_phys(ds)->ds_referenced_bytes ||
3153 newval < ds->ds_reserved) {
3154 dsl_dataset_rele(ds, FTAG);
3155 return (SET_ERROR(ENOSPC));
3156 }
3157
3158 dsl_dataset_rele(ds, FTAG);
3159 return (0);
3160 }
3161
3162 static void
3163 dsl_dataset_set_refquota_sync(void *arg, dmu_tx_t *tx)
3164 {
3165 dsl_dataset_set_qr_arg_t *ddsqra = arg;
3166 dsl_pool_t *dp = dmu_tx_pool(tx);
3167 dsl_dataset_t *ds;
3168 uint64_t newval;
3169
3170 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds));
3171
3172 dsl_prop_set_sync_impl(ds,
3173 zfs_prop_to_name(ZFS_PROP_REFQUOTA),
3174 ddsqra->ddsqra_source, sizeof (ddsqra->ddsqra_value), 1,
3175 &ddsqra->ddsqra_value, tx);
3176
3177 VERIFY0(dsl_prop_get_int_ds(ds,
3178 zfs_prop_to_name(ZFS_PROP_REFQUOTA), &newval));
3179
3180 if (ds->ds_quota != newval) {
3181 dmu_buf_will_dirty(ds->ds_dbuf, tx);
3182 ds->ds_quota = newval;
3183 }
3184 dsl_dataset_rele(ds, FTAG);
3185 }
3186
3187 int
3188 dsl_dataset_set_refquota(const char *dsname, zprop_source_t source,
3189 uint64_t refquota)
3190 {
3191 dsl_dataset_set_qr_arg_t ddsqra;
3192
3193 ddsqra.ddsqra_name = dsname;
3194 ddsqra.ddsqra_source = source;
3195 ddsqra.ddsqra_value = refquota;
3196
3197 return (dsl_sync_task(dsname, dsl_dataset_set_refquota_check,
3198 dsl_dataset_set_refquota_sync, &ddsqra, 0, ZFS_SPACE_CHECK_NONE));
3199 }
3200
3201 static int
3202 dsl_dataset_set_refreservation_check(void *arg, dmu_tx_t *tx)
3203 {
3204 dsl_dataset_set_qr_arg_t *ddsqra = arg;
3205 dsl_pool_t *dp = dmu_tx_pool(tx);
3206 dsl_dataset_t *ds;
3207 int error;
3208 uint64_t newval, unique;
3209
3210 if (spa_version(dp->dp_spa) < SPA_VERSION_REFRESERVATION)
3211 return (SET_ERROR(ENOTSUP));
3212
3213 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds);
3214 if (error != 0)
3215 return (error);
3216
3217 if (ds->ds_is_snapshot) {
3218 dsl_dataset_rele(ds, FTAG);
3219 return (SET_ERROR(EINVAL));
3220 }
3221
3222 error = dsl_prop_predict(ds->ds_dir,
3223 zfs_prop_to_name(ZFS_PROP_REFRESERVATION),
3224 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval);
3225 if (error != 0) {
3226 dsl_dataset_rele(ds, FTAG);
3227 return (error);
3228 }
3229
3230 /*
3231 * If we are doing the preliminary check in open context, the
3232 * space estimates may be inaccurate.
3233 */
3234 if (!dmu_tx_is_syncing(tx)) {
3235 dsl_dataset_rele(ds, FTAG);
3236 return (0);
3237 }
3238
3239 mutex_enter(&ds->ds_lock);
3240 if (!DS_UNIQUE_IS_ACCURATE(ds))
3241 dsl_dataset_recalc_head_uniq(ds);
3242 unique = dsl_dataset_phys(ds)->ds_unique_bytes;
3243 mutex_exit(&ds->ds_lock);
3244
3245 if (MAX(unique, newval) > MAX(unique, ds->ds_reserved)) {
3246 uint64_t delta = MAX(unique, newval) -
3247 MAX(unique, ds->ds_reserved);
3248
3249 if (delta >
3250 dsl_dir_space_available(ds->ds_dir, NULL, 0, B_TRUE) ||
3251 (ds->ds_quota > 0 && newval > ds->ds_quota)) {
3252 dsl_dataset_rele(ds, FTAG);
3253 return (SET_ERROR(ENOSPC));
3254 }
3255 }
3256
3257 dsl_dataset_rele(ds, FTAG);
3258 return (0);
3259 }
3260
3261 void
3262 dsl_dataset_set_refreservation_sync_impl(dsl_dataset_t *ds,
3263 zprop_source_t source, uint64_t value, dmu_tx_t *tx)
3264 {
3265 uint64_t newval;
3266 uint64_t unique;
3267 int64_t delta;
3268
3269 dsl_prop_set_sync_impl(ds, zfs_prop_to_name(ZFS_PROP_REFRESERVATION),
3270 source, sizeof (value), 1, &value, tx);
3271
3272 VERIFY0(dsl_prop_get_int_ds(ds,
3273 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), &newval));
3274
3275 dmu_buf_will_dirty(ds->ds_dbuf, tx);
3276 mutex_enter(&ds->ds_dir->dd_lock);
3277 mutex_enter(&ds->ds_lock);
3278 ASSERT(DS_UNIQUE_IS_ACCURATE(ds));
3279 unique = dsl_dataset_phys(ds)->ds_unique_bytes;
3280 delta = MAX(0, (int64_t)(newval - unique)) -
3281 MAX(0, (int64_t)(ds->ds_reserved - unique));
3282 ds->ds_reserved = newval;
3283 mutex_exit(&ds->ds_lock);
3284
3285 dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV, delta, 0, 0, tx);
3286 mutex_exit(&ds->ds_dir->dd_lock);
3287 }
3288
3289 static void
3290 dsl_dataset_set_refreservation_sync(void *arg, dmu_tx_t *tx)
3291 {
3292 dsl_dataset_set_qr_arg_t *ddsqra = arg;
3293 dsl_pool_t *dp = dmu_tx_pool(tx);
3294 dsl_dataset_t *ds;
3295
3296 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds));
3297 dsl_dataset_set_refreservation_sync_impl(ds,
3298 ddsqra->ddsqra_source, ddsqra->ddsqra_value, tx);
3299 dsl_dataset_rele(ds, FTAG);
3300 }
3301
3302 int
3303 dsl_dataset_set_refreservation(const char *dsname, zprop_source_t source,
3304 uint64_t refreservation)
3305 {
3306 dsl_dataset_set_qr_arg_t ddsqra;
3307
3308 ddsqra.ddsqra_name = dsname;
3309 ddsqra.ddsqra_source = source;
3310 ddsqra.ddsqra_value = refreservation;
3311
3312 return (dsl_sync_task(dsname, dsl_dataset_set_refreservation_check,
3313 dsl_dataset_set_refreservation_sync, &ddsqra,
3314 0, ZFS_SPACE_CHECK_NONE));
3315 }
3316
3317 /*
3318 * Return (in *usedp) the amount of space written in new that is not
3319 * present in oldsnap. New may be a snapshot or the head. Old must be
3320 * a snapshot before new, in new's filesystem (or its origin). If not then
3321 * fail and return EINVAL.
3322 *
3323 * The written space is calculated by considering two components: First, we
3324 * ignore any freed space, and calculate the written as new's used space
3325 * minus old's used space. Next, we add in the amount of space that was freed
3326 * between the two snapshots, thus reducing new's used space relative to old's.
3327 * Specifically, this is the space that was born before old->ds_creation_txg,
3328 * and freed before new (ie. on new's deadlist or a previous deadlist).
3329 *
3330 * space freed [---------------------]
3331 * snapshots ---O-------O--------O-------O------
3332 * oldsnap new
3333 */
3334 int
3335 dsl_dataset_space_written(dsl_dataset_t *oldsnap, dsl_dataset_t *new,
3336 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp)
3337 {
3338 int err = 0;
3339 uint64_t snapobj;
3340 dsl_pool_t *dp = new->ds_dir->dd_pool;
3341
3342 ASSERT(dsl_pool_config_held(dp));
3343
3344 *usedp = 0;
3345 *usedp += dsl_dataset_phys(new)->ds_referenced_bytes;
3346 *usedp -= dsl_dataset_phys(oldsnap)->ds_referenced_bytes;
3347
3348 *compp = 0;
3349 *compp += dsl_dataset_phys(new)->ds_compressed_bytes;
3350 *compp -= dsl_dataset_phys(oldsnap)->ds_compressed_bytes;
3351
3352 *uncompp = 0;
3353 *uncompp += dsl_dataset_phys(new)->ds_uncompressed_bytes;
3354 *uncompp -= dsl_dataset_phys(oldsnap)->ds_uncompressed_bytes;
3355
3356 snapobj = new->ds_object;
3357 while (snapobj != oldsnap->ds_object) {
3358 dsl_dataset_t *snap;
3359 uint64_t used, comp, uncomp;
3360
3361 if (snapobj == new->ds_object) {
3362 snap = new;
3363 } else {
3364 err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &snap);
3365 if (err != 0)
3366 break;
3367 }
3368
3369 if (dsl_dataset_phys(snap)->ds_prev_snap_txg ==
3370 dsl_dataset_phys(oldsnap)->ds_creation_txg) {
3371 /*
3372 * The blocks in the deadlist can not be born after
3373 * ds_prev_snap_txg, so get the whole deadlist space,
3374 * which is more efficient (especially for old-format
3375 * deadlists). Unfortunately the deadlist code
3376 * doesn't have enough information to make this
3377 * optimization itself.
3378 */
3379 dsl_deadlist_space(&snap->ds_deadlist,
3380 &used, &comp, &uncomp);
3381 } else {
3382 dsl_deadlist_space_range(&snap->ds_deadlist,
3383 0, dsl_dataset_phys(oldsnap)->ds_creation_txg,
3384 &used, &comp, &uncomp);
3385 }
3386 *usedp += used;
3387 *compp += comp;
3388 *uncompp += uncomp;
3389
3390 /*
3391 * If we get to the beginning of the chain of snapshots
3392 * (ds_prev_snap_obj == 0) before oldsnap, then oldsnap
3393 * was not a snapshot of/before new.
3394 */
3395 snapobj = dsl_dataset_phys(snap)->ds_prev_snap_obj;
3396 if (snap != new)
3397 dsl_dataset_rele(snap, FTAG);
3398 if (snapobj == 0) {
3399 err = SET_ERROR(EINVAL);
3400 break;
3401 }
3402
3403 }
3404 return (err);
3405 }
3406
3407 /*
3408 * Return (in *usedp) the amount of space that will be reclaimed if firstsnap,
3409 * lastsnap, and all snapshots in between are deleted.
3410 *
3411 * blocks that would be freed [---------------------------]
3412 * snapshots ---O-------O--------O-------O--------O
3413 * firstsnap lastsnap
3414 *
3415 * This is the set of blocks that were born after the snap before firstsnap,
3416 * (birth > firstsnap->prev_snap_txg) and died before the snap after the
3417 * last snap (ie, is on lastsnap->ds_next->ds_deadlist or an earlier deadlist).
3418 * We calculate this by iterating over the relevant deadlists (from the snap
3419 * after lastsnap, backward to the snap after firstsnap), summing up the
3420 * space on the deadlist that was born after the snap before firstsnap.
3421 */
3422 int
3423 dsl_dataset_space_wouldfree(dsl_dataset_t *firstsnap,
3424 dsl_dataset_t *lastsnap,
3425 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp)
3426 {
3427 int err = 0;
3428 uint64_t snapobj;
3429 dsl_pool_t *dp = firstsnap->ds_dir->dd_pool;
3430
3431 ASSERT(firstsnap->ds_is_snapshot);
3432 ASSERT(lastsnap->ds_is_snapshot);
3433
3434 /*
3435 * Check that the snapshots are in the same dsl_dir, and firstsnap
3436 * is before lastsnap.
3437 */
3438 if (firstsnap->ds_dir != lastsnap->ds_dir ||
3439 dsl_dataset_phys(firstsnap)->ds_creation_txg >
3440 dsl_dataset_phys(lastsnap)->ds_creation_txg)
3441 return (SET_ERROR(EINVAL));
3442
3443 *usedp = *compp = *uncompp = 0;
3444
3445 snapobj = dsl_dataset_phys(lastsnap)->ds_next_snap_obj;
3446 while (snapobj != firstsnap->ds_object) {
3447 dsl_dataset_t *ds;
3448 uint64_t used, comp, uncomp;
3449
3450 err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &ds);
3451 if (err != 0)
3452 break;
3453
3454 dsl_deadlist_space_range(&ds->ds_deadlist,
3455 dsl_dataset_phys(firstsnap)->ds_prev_snap_txg, UINT64_MAX,
3456 &used, &comp, &uncomp);
3457 *usedp += used;
3458 *compp += comp;
3459 *uncompp += uncomp;
3460
3461 snapobj = dsl_dataset_phys(ds)->ds_prev_snap_obj;
3462 ASSERT3U(snapobj, !=, 0);
3463 dsl_dataset_rele(ds, FTAG);
3464 }
3465 return (err);
3466 }
3467
3468 /*
3469 * Return TRUE if 'earlier' is an earlier snapshot in 'later's timeline.
3470 * For example, they could both be snapshots of the same filesystem, and
3471 * 'earlier' is before 'later'. Or 'earlier' could be the origin of
3472 * 'later's filesystem. Or 'earlier' could be an older snapshot in the origin's
3473 * filesystem. Or 'earlier' could be the origin's origin.
3474 *
3475 * If non-zero, earlier_txg is used instead of earlier's ds_creation_txg.
3476 */
3477 boolean_t
3478 dsl_dataset_is_before(dsl_dataset_t *later, dsl_dataset_t *earlier,
3479 uint64_t earlier_txg)
3480 {
3481 dsl_pool_t *dp = later->ds_dir->dd_pool;
3482 int error;
3483 boolean_t ret;
3484 dsl_dataset_t *origin;
3485
3486 ASSERT(dsl_pool_config_held(dp));
3487 ASSERT(earlier->ds_is_snapshot || earlier_txg != 0);
3488
3489 if (earlier_txg == 0)
3490 earlier_txg = dsl_dataset_phys(earlier)->ds_creation_txg;
3491
3492 if (later->ds_is_snapshot &&
3493 earlier_txg >= dsl_dataset_phys(later)->ds_creation_txg)
3494 return (B_FALSE);
3495
3496 if (later->ds_dir == earlier->ds_dir)
3497 return (B_TRUE);
3498 if (!dsl_dir_is_clone(later->ds_dir))
3499 return (B_FALSE);
3500
3501 if (dsl_dir_phys(later->ds_dir)->dd_origin_obj == earlier->ds_object)
3502 return (B_TRUE);
3503 error = dsl_dataset_hold_obj(dp,
3504 dsl_dir_phys(later->ds_dir)->dd_origin_obj, FTAG, &origin);
3505 if (error != 0)
3506 return (B_FALSE);
3507 ret = dsl_dataset_is_before(origin, earlier, earlier_txg);
3508 dsl_dataset_rele(origin, FTAG);
3509 return (ret);
3510 }
3511
3512 void
3513 dsl_dataset_zapify(dsl_dataset_t *ds, dmu_tx_t *tx)
3514 {
3515 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
3516 dmu_object_zapify(mos, ds->ds_object, DMU_OT_DSL_DATASET, tx);
3517 }
3518
3519 boolean_t
3520 dsl_dataset_is_zapified(dsl_dataset_t *ds)
3521 {
3522 dmu_object_info_t doi;
3523
3524 dmu_object_info_from_db(ds->ds_dbuf, &doi);
3525 return (doi.doi_type == DMU_OTN_ZAP_METADATA);
3526 }
3527
3528 boolean_t
3529 dsl_dataset_has_resume_receive_state(dsl_dataset_t *ds)
3530 {
3531 return (dsl_dataset_is_zapified(ds) &&
3532 zap_contains(ds->ds_dir->dd_pool->dp_meta_objset,
3533 ds->ds_object, DS_FIELD_RESUME_TOGUID) == 0);
3534 }
3535
3536 #if defined(_KERNEL) && defined(HAVE_SPL)
3537 #if defined(_LP64)
3538 module_param(zfs_max_recordsize, int, 0644);
3539 MODULE_PARM_DESC(zfs_max_recordsize, "Max allowed record size");
3540 #else
3541 /* Limited to 1M on 32-bit platforms due to lack of virtual address space */
3542 module_param(zfs_max_recordsize, int, 0444);
3543 MODULE_PARM_DESC(zfs_max_recordsize, "Max allowed record size");
3544 #endif
3545
3546 EXPORT_SYMBOL(dsl_dataset_hold);
3547 EXPORT_SYMBOL(dsl_dataset_hold_obj);
3548 EXPORT_SYMBOL(dsl_dataset_own);
3549 EXPORT_SYMBOL(dsl_dataset_own_obj);
3550 EXPORT_SYMBOL(dsl_dataset_name);
3551 EXPORT_SYMBOL(dsl_dataset_rele);
3552 EXPORT_SYMBOL(dsl_dataset_disown);
3553 EXPORT_SYMBOL(dsl_dataset_tryown);
3554 EXPORT_SYMBOL(dsl_dataset_create_sync);
3555 EXPORT_SYMBOL(dsl_dataset_create_sync_dd);
3556 EXPORT_SYMBOL(dsl_dataset_snapshot_check);
3557 EXPORT_SYMBOL(dsl_dataset_snapshot_sync);
3558 EXPORT_SYMBOL(dsl_dataset_promote);
3559 EXPORT_SYMBOL(dsl_dataset_user_hold);
3560 EXPORT_SYMBOL(dsl_dataset_user_release);
3561 EXPORT_SYMBOL(dsl_dataset_get_holds);
3562 EXPORT_SYMBOL(dsl_dataset_get_blkptr);
3563 EXPORT_SYMBOL(dsl_dataset_set_blkptr);
3564 EXPORT_SYMBOL(dsl_dataset_get_spa);
3565 EXPORT_SYMBOL(dsl_dataset_modified_since_snap);
3566 EXPORT_SYMBOL(dsl_dataset_space_written);
3567 EXPORT_SYMBOL(dsl_dataset_space_wouldfree);
3568 EXPORT_SYMBOL(dsl_dataset_sync);
3569 EXPORT_SYMBOL(dsl_dataset_block_born);
3570 EXPORT_SYMBOL(dsl_dataset_block_kill);
3571 EXPORT_SYMBOL(dsl_dataset_block_freeable);
3572 EXPORT_SYMBOL(dsl_dataset_prev_snap_txg);
3573 EXPORT_SYMBOL(dsl_dataset_dirty);
3574 EXPORT_SYMBOL(dsl_dataset_stats);
3575 EXPORT_SYMBOL(dsl_dataset_fast_stat);
3576 EXPORT_SYMBOL(dsl_dataset_space);
3577 EXPORT_SYMBOL(dsl_dataset_fsid_guid);
3578 EXPORT_SYMBOL(dsl_dsobj_to_dsname);
3579 EXPORT_SYMBOL(dsl_dataset_check_quota);
3580 EXPORT_SYMBOL(dsl_dataset_clone_swap_check_impl);
3581 EXPORT_SYMBOL(dsl_dataset_clone_swap_sync_impl);
3582 #endif
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