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DLPX-40252 integrate EP-476 compressed zfs send/receive
[mirror_zfs.git] / module / zfs / dsl_dataset.c
1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21 /*
22 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
23 * Copyright (c) 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 * Copyright 2016, OmniTI Computer Consulting, Inc. All rights reserved.
29 */
30
31 #include <sys/dmu_objset.h>
32 #include <sys/dsl_dataset.h>
33 #include <sys/dsl_dir.h>
34 #include <sys/dsl_prop.h>
35 #include <sys/dsl_synctask.h>
36 #include <sys/dmu_traverse.h>
37 #include <sys/dmu_impl.h>
38 #include <sys/dmu_tx.h>
39 #include <sys/arc.h>
40 #include <sys/zio.h>
41 #include <sys/zap.h>
42 #include <sys/zfeature.h>
43 #include <sys/unique.h>
44 #include <sys/zfs_context.h>
45 #include <sys/zfs_ioctl.h>
46 #include <sys/spa.h>
47 #include <sys/zfs_znode.h>
48 #include <sys/zfs_onexit.h>
49 #include <sys/zvol.h>
50 #include <sys/dsl_scan.h>
51 #include <sys/dsl_deadlist.h>
52 #include <sys/dsl_destroy.h>
53 #include <sys/dsl_userhold.h>
54 #include <sys/dsl_bookmark.h>
55 #include <sys/policy.h>
56 #include <sys/dmu_send.h>
57 #include <sys/zio_compress.h>
58 #include <zfs_fletcher.h>
59
60 /*
61 * The SPA supports block sizes up to 16MB. However, very large blocks
62 * can have an impact on i/o latency (e.g. tying up a spinning disk for
63 * ~300ms), and also potentially on the memory allocator. Therefore,
64 * we do not allow the recordsize to be set larger than zfs_max_recordsize
65 * (default 1MB). Larger blocks can be created by changing this tunable,
66 * and pools with larger blocks can always be imported and used, regardless
67 * of this setting.
68 */
69 int zfs_max_recordsize = 1 * 1024 * 1024;
70
71 #define SWITCH64(x, y) \
72 { \
73 uint64_t __tmp = (x); \
74 (x) = (y); \
75 (y) = __tmp; \
76 }
77
78 #define DS_REF_MAX (1ULL << 62)
79
80 extern inline dsl_dataset_phys_t *dsl_dataset_phys(dsl_dataset_t *ds);
81
82 extern int spa_asize_inflation;
83
84 /*
85 * Figure out how much of this delta should be propogated to the dsl_dir
86 * layer. If there's a refreservation, that space has already been
87 * partially accounted for in our ancestors.
88 */
89 static int64_t
90 parent_delta(dsl_dataset_t *ds, int64_t delta)
91 {
92 dsl_dataset_phys_t *ds_phys;
93 uint64_t old_bytes, new_bytes;
94
95 if (ds->ds_reserved == 0)
96 return (delta);
97
98 ds_phys = dsl_dataset_phys(ds);
99 old_bytes = MAX(ds_phys->ds_unique_bytes, ds->ds_reserved);
100 new_bytes = MAX(ds_phys->ds_unique_bytes + delta, ds->ds_reserved);
101
102 ASSERT3U(ABS((int64_t)(new_bytes - old_bytes)), <=, ABS(delta));
103 return (new_bytes - old_bytes);
104 }
105
106 void
107 dsl_dataset_block_born(dsl_dataset_t *ds, const blkptr_t *bp, dmu_tx_t *tx)
108 {
109 int used, compressed, uncompressed;
110 int64_t delta;
111
112 used = bp_get_dsize_sync(tx->tx_pool->dp_spa, bp);
113 compressed = BP_GET_PSIZE(bp);
114 uncompressed = BP_GET_UCSIZE(bp);
115
116 dprintf_bp(bp, "ds=%p", ds);
117
118 ASSERT(dmu_tx_is_syncing(tx));
119 /* It could have been compressed away to nothing */
120 if (BP_IS_HOLE(bp))
121 return;
122 ASSERT(BP_GET_TYPE(bp) != DMU_OT_NONE);
123 ASSERT(DMU_OT_IS_VALID(BP_GET_TYPE(bp)));
124 if (ds == NULL) {
125 dsl_pool_mos_diduse_space(tx->tx_pool,
126 used, compressed, uncompressed);
127 return;
128 }
129
130 dmu_buf_will_dirty(ds->ds_dbuf, tx);
131 mutex_enter(&ds->ds_lock);
132 delta = parent_delta(ds, used);
133 dsl_dataset_phys(ds)->ds_referenced_bytes += used;
134 dsl_dataset_phys(ds)->ds_compressed_bytes += compressed;
135 dsl_dataset_phys(ds)->ds_uncompressed_bytes += uncompressed;
136 dsl_dataset_phys(ds)->ds_unique_bytes += used;
137 if (BP_GET_LSIZE(bp) > SPA_OLD_MAXBLOCKSIZE) {
138 ds->ds_feature_activation_needed[SPA_FEATURE_LARGE_BLOCKS] =
139 B_TRUE;
140 }
141 mutex_exit(&ds->ds_lock);
142 dsl_dir_diduse_space(ds->ds_dir, DD_USED_HEAD, delta,
143 compressed, uncompressed, tx);
144 dsl_dir_transfer_space(ds->ds_dir, used - delta,
145 DD_USED_REFRSRV, DD_USED_HEAD, tx);
146 }
147
148 int
149 dsl_dataset_block_kill(dsl_dataset_t *ds, const blkptr_t *bp, dmu_tx_t *tx,
150 boolean_t async)
151 {
152 int used = bp_get_dsize_sync(tx->tx_pool->dp_spa, bp);
153 int compressed = BP_GET_PSIZE(bp);
154 int uncompressed = BP_GET_UCSIZE(bp);
155
156 if (BP_IS_HOLE(bp))
157 return (0);
158
159 ASSERT(dmu_tx_is_syncing(tx));
160 ASSERT(bp->blk_birth <= tx->tx_txg);
161
162 if (ds == NULL) {
163 dsl_free(tx->tx_pool, tx->tx_txg, bp);
164 dsl_pool_mos_diduse_space(tx->tx_pool,
165 -used, -compressed, -uncompressed);
166 return (used);
167 }
168 ASSERT3P(tx->tx_pool, ==, ds->ds_dir->dd_pool);
169
170 ASSERT(!ds->ds_is_snapshot);
171 dmu_buf_will_dirty(ds->ds_dbuf, tx);
172
173 if (bp->blk_birth > dsl_dataset_phys(ds)->ds_prev_snap_txg) {
174 int64_t delta;
175
176 dprintf_bp(bp, "freeing ds=%llu", ds->ds_object);
177 dsl_free(tx->tx_pool, tx->tx_txg, bp);
178
179 mutex_enter(&ds->ds_lock);
180 ASSERT(dsl_dataset_phys(ds)->ds_unique_bytes >= used ||
181 !DS_UNIQUE_IS_ACCURATE(ds));
182 delta = parent_delta(ds, -used);
183 dsl_dataset_phys(ds)->ds_unique_bytes -= used;
184 mutex_exit(&ds->ds_lock);
185 dsl_dir_diduse_space(ds->ds_dir, DD_USED_HEAD,
186 delta, -compressed, -uncompressed, tx);
187 dsl_dir_transfer_space(ds->ds_dir, -used - delta,
188 DD_USED_REFRSRV, DD_USED_HEAD, tx);
189 } else {
190 dprintf_bp(bp, "putting on dead list: %s", "");
191 if (async) {
192 /*
193 * We are here as part of zio's write done callback,
194 * which means we're a zio interrupt thread. We can't
195 * call dsl_deadlist_insert() now because it may block
196 * waiting for I/O. Instead, put bp on the deferred
197 * queue and let dsl_pool_sync() finish the job.
198 */
199 bplist_append(&ds->ds_pending_deadlist, bp);
200 } else {
201 dsl_deadlist_insert(&ds->ds_deadlist, bp, tx);
202 }
203 ASSERT3U(ds->ds_prev->ds_object, ==,
204 dsl_dataset_phys(ds)->ds_prev_snap_obj);
205 ASSERT(dsl_dataset_phys(ds->ds_prev)->ds_num_children > 0);
206 /* if (bp->blk_birth > prev prev snap txg) prev unique += bs */
207 if (dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj ==
208 ds->ds_object && bp->blk_birth >
209 dsl_dataset_phys(ds->ds_prev)->ds_prev_snap_txg) {
210 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx);
211 mutex_enter(&ds->ds_prev->ds_lock);
212 dsl_dataset_phys(ds->ds_prev)->ds_unique_bytes += used;
213 mutex_exit(&ds->ds_prev->ds_lock);
214 }
215 if (bp->blk_birth > ds->ds_dir->dd_origin_txg) {
216 dsl_dir_transfer_space(ds->ds_dir, used,
217 DD_USED_HEAD, DD_USED_SNAP, tx);
218 }
219 }
220 mutex_enter(&ds->ds_lock);
221 ASSERT3U(dsl_dataset_phys(ds)->ds_referenced_bytes, >=, used);
222 dsl_dataset_phys(ds)->ds_referenced_bytes -= used;
223 ASSERT3U(dsl_dataset_phys(ds)->ds_compressed_bytes, >=, compressed);
224 dsl_dataset_phys(ds)->ds_compressed_bytes -= compressed;
225 ASSERT3U(dsl_dataset_phys(ds)->ds_uncompressed_bytes, >=, uncompressed);
226 dsl_dataset_phys(ds)->ds_uncompressed_bytes -= uncompressed;
227 mutex_exit(&ds->ds_lock);
228
229 return (used);
230 }
231
232 uint64_t
233 dsl_dataset_prev_snap_txg(dsl_dataset_t *ds)
234 {
235 uint64_t trysnap = 0;
236
237 if (ds == NULL)
238 return (0);
239 /*
240 * The snapshot creation could fail, but that would cause an
241 * incorrect FALSE return, which would only result in an
242 * overestimation of the amount of space that an operation would
243 * consume, which is OK.
244 *
245 * There's also a small window where we could miss a pending
246 * snapshot, because we could set the sync task in the quiescing
247 * phase. So this should only be used as a guess.
248 */
249 if (ds->ds_trysnap_txg >
250 spa_last_synced_txg(ds->ds_dir->dd_pool->dp_spa))
251 trysnap = ds->ds_trysnap_txg;
252 return (MAX(dsl_dataset_phys(ds)->ds_prev_snap_txg, trysnap));
253 }
254
255 boolean_t
256 dsl_dataset_block_freeable(dsl_dataset_t *ds, const blkptr_t *bp,
257 uint64_t blk_birth)
258 {
259 if (blk_birth <= dsl_dataset_prev_snap_txg(ds) ||
260 (bp != NULL && BP_IS_HOLE(bp)))
261 return (B_FALSE);
262
263 ddt_prefetch(dsl_dataset_get_spa(ds), bp);
264
265 return (B_TRUE);
266 }
267
268 static void
269 dsl_dataset_evict(void *dbu)
270 {
271 dsl_dataset_t *ds = dbu;
272
273 ASSERT(ds->ds_owner == NULL);
274
275 ds->ds_dbuf = NULL;
276
277 unique_remove(ds->ds_fsid_guid);
278
279 if (ds->ds_objset != NULL)
280 dmu_objset_evict(ds->ds_objset);
281
282 if (ds->ds_prev) {
283 dsl_dataset_rele(ds->ds_prev, ds);
284 ds->ds_prev = NULL;
285 }
286
287 bplist_destroy(&ds->ds_pending_deadlist);
288 if (ds->ds_deadlist.dl_os != NULL)
289 dsl_deadlist_close(&ds->ds_deadlist);
290 if (ds->ds_dir)
291 dsl_dir_async_rele(ds->ds_dir, ds);
292
293 ASSERT(!list_link_active(&ds->ds_synced_link));
294
295 list_destroy(&ds->ds_prop_cbs);
296 mutex_destroy(&ds->ds_lock);
297 mutex_destroy(&ds->ds_opening_lock);
298 mutex_destroy(&ds->ds_sendstream_lock);
299 refcount_destroy(&ds->ds_longholds);
300
301 kmem_free(ds, sizeof (dsl_dataset_t));
302 }
303
304 int
305 dsl_dataset_get_snapname(dsl_dataset_t *ds)
306 {
307 dsl_dataset_phys_t *headphys;
308 int err;
309 dmu_buf_t *headdbuf;
310 dsl_pool_t *dp = ds->ds_dir->dd_pool;
311 objset_t *mos = dp->dp_meta_objset;
312
313 if (ds->ds_snapname[0])
314 return (0);
315 if (dsl_dataset_phys(ds)->ds_next_snap_obj == 0)
316 return (0);
317
318 err = dmu_bonus_hold(mos, dsl_dir_phys(ds->ds_dir)->dd_head_dataset_obj,
319 FTAG, &headdbuf);
320 if (err != 0)
321 return (err);
322 headphys = headdbuf->db_data;
323 err = zap_value_search(dp->dp_meta_objset,
324 headphys->ds_snapnames_zapobj, ds->ds_object, 0, ds->ds_snapname);
325 if (err != 0 && zfs_recover == B_TRUE) {
326 err = 0;
327 (void) snprintf(ds->ds_snapname, sizeof (ds->ds_snapname),
328 "SNAPOBJ=%llu-ERR=%d",
329 (unsigned long long)ds->ds_object, err);
330 }
331 dmu_buf_rele(headdbuf, FTAG);
332 return (err);
333 }
334
335 int
336 dsl_dataset_snap_lookup(dsl_dataset_t *ds, const char *name, uint64_t *value)
337 {
338 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
339 uint64_t snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj;
340 matchtype_t mt;
341 int err;
342
343 if (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_CI_DATASET)
344 mt = MT_FIRST;
345 else
346 mt = MT_EXACT;
347
348 err = zap_lookup_norm(mos, snapobj, name, 8, 1,
349 value, mt, NULL, 0, NULL);
350 if (err == ENOTSUP && mt == MT_FIRST)
351 err = zap_lookup(mos, snapobj, name, 8, 1, value);
352 return (err);
353 }
354
355 int
356 dsl_dataset_snap_remove(dsl_dataset_t *ds, const char *name, dmu_tx_t *tx,
357 boolean_t adj_cnt)
358 {
359 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
360 uint64_t snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj;
361 matchtype_t mt;
362 int err;
363
364 dsl_dir_snap_cmtime_update(ds->ds_dir);
365
366 if (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_CI_DATASET)
367 mt = MT_FIRST;
368 else
369 mt = MT_EXACT;
370
371 err = zap_remove_norm(mos, snapobj, name, mt, tx);
372 if (err == ENOTSUP && mt == MT_FIRST)
373 err = zap_remove(mos, snapobj, name, tx);
374
375 if (err == 0 && adj_cnt)
376 dsl_fs_ss_count_adjust(ds->ds_dir, -1,
377 DD_FIELD_SNAPSHOT_COUNT, tx);
378
379 return (err);
380 }
381
382 boolean_t
383 dsl_dataset_try_add_ref(dsl_pool_t *dp, dsl_dataset_t *ds, void *tag)
384 {
385 dmu_buf_t *dbuf = ds->ds_dbuf;
386 boolean_t result = B_FALSE;
387
388 if (dbuf != NULL && dmu_buf_try_add_ref(dbuf, dp->dp_meta_objset,
389 ds->ds_object, DMU_BONUS_BLKID, tag)) {
390
391 if (ds == dmu_buf_get_user(dbuf))
392 result = B_TRUE;
393 else
394 dmu_buf_rele(dbuf, tag);
395 }
396
397 return (result);
398 }
399
400 int
401 dsl_dataset_hold_obj(dsl_pool_t *dp, uint64_t dsobj, void *tag,
402 dsl_dataset_t **dsp)
403 {
404 objset_t *mos = dp->dp_meta_objset;
405 dmu_buf_t *dbuf;
406 dsl_dataset_t *ds;
407 int err;
408 dmu_object_info_t doi;
409
410 ASSERT(dsl_pool_config_held(dp));
411
412 err = dmu_bonus_hold(mos, dsobj, tag, &dbuf);
413 if (err != 0)
414 return (err);
415
416 /* Make sure dsobj has the correct object type. */
417 dmu_object_info_from_db(dbuf, &doi);
418 if (doi.doi_bonus_type != DMU_OT_DSL_DATASET) {
419 dmu_buf_rele(dbuf, tag);
420 return (SET_ERROR(EINVAL));
421 }
422
423 ds = dmu_buf_get_user(dbuf);
424 if (ds == NULL) {
425 dsl_dataset_t *winner = NULL;
426
427 ds = kmem_zalloc(sizeof (dsl_dataset_t), KM_SLEEP);
428 ds->ds_dbuf = dbuf;
429 ds->ds_object = dsobj;
430 ds->ds_is_snapshot = dsl_dataset_phys(ds)->ds_num_children != 0;
431 list_link_init(&ds->ds_synced_link);
432
433 mutex_init(&ds->ds_lock, NULL, MUTEX_DEFAULT, NULL);
434 mutex_init(&ds->ds_opening_lock, NULL, MUTEX_DEFAULT, NULL);
435 mutex_init(&ds->ds_sendstream_lock, NULL, MUTEX_DEFAULT, NULL);
436 refcount_create(&ds->ds_longholds);
437
438 bplist_create(&ds->ds_pending_deadlist);
439 dsl_deadlist_open(&ds->ds_deadlist,
440 mos, dsl_dataset_phys(ds)->ds_deadlist_obj);
441
442 list_create(&ds->ds_sendstreams, sizeof (dmu_sendarg_t),
443 offsetof(dmu_sendarg_t, dsa_link));
444
445 list_create(&ds->ds_prop_cbs, sizeof (dsl_prop_cb_record_t),
446 offsetof(dsl_prop_cb_record_t, cbr_ds_node));
447
448 if (doi.doi_type == DMU_OTN_ZAP_METADATA) {
449 spa_feature_t f;
450
451 for (f = 0; f < SPA_FEATURES; f++) {
452 if (!(spa_feature_table[f].fi_flags &
453 ZFEATURE_FLAG_PER_DATASET))
454 continue;
455 err = zap_contains(mos, dsobj,
456 spa_feature_table[f].fi_guid);
457 if (err == 0) {
458 ds->ds_feature_inuse[f] = B_TRUE;
459 } else {
460 ASSERT3U(err, ==, ENOENT);
461 err = 0;
462 }
463 }
464 }
465
466 err = dsl_dir_hold_obj(dp,
467 dsl_dataset_phys(ds)->ds_dir_obj, NULL, ds, &ds->ds_dir);
468 if (err != 0) {
469 mutex_destroy(&ds->ds_lock);
470 mutex_destroy(&ds->ds_opening_lock);
471 mutex_destroy(&ds->ds_sendstream_lock);
472 refcount_destroy(&ds->ds_longholds);
473 bplist_destroy(&ds->ds_pending_deadlist);
474 dsl_deadlist_close(&ds->ds_deadlist);
475 kmem_free(ds, sizeof (dsl_dataset_t));
476 dmu_buf_rele(dbuf, tag);
477 return (err);
478 }
479
480 if (!ds->ds_is_snapshot) {
481 ds->ds_snapname[0] = '\0';
482 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) {
483 err = dsl_dataset_hold_obj(dp,
484 dsl_dataset_phys(ds)->ds_prev_snap_obj,
485 ds, &ds->ds_prev);
486 }
487 if (doi.doi_type == DMU_OTN_ZAP_METADATA) {
488 int zaperr = zap_lookup(mos, ds->ds_object,
489 DS_FIELD_BOOKMARK_NAMES,
490 sizeof (ds->ds_bookmarks), 1,
491 &ds->ds_bookmarks);
492 if (zaperr != ENOENT)
493 VERIFY0(zaperr);
494 }
495 } else {
496 if (zfs_flags & ZFS_DEBUG_SNAPNAMES)
497 err = dsl_dataset_get_snapname(ds);
498 if (err == 0 &&
499 dsl_dataset_phys(ds)->ds_userrefs_obj != 0) {
500 err = zap_count(
501 ds->ds_dir->dd_pool->dp_meta_objset,
502 dsl_dataset_phys(ds)->ds_userrefs_obj,
503 &ds->ds_userrefs);
504 }
505 }
506
507 if (err == 0 && !ds->ds_is_snapshot) {
508 err = dsl_prop_get_int_ds(ds,
509 zfs_prop_to_name(ZFS_PROP_REFRESERVATION),
510 &ds->ds_reserved);
511 if (err == 0) {
512 err = dsl_prop_get_int_ds(ds,
513 zfs_prop_to_name(ZFS_PROP_REFQUOTA),
514 &ds->ds_quota);
515 }
516 } else {
517 ds->ds_reserved = ds->ds_quota = 0;
518 }
519
520 dmu_buf_init_user(&ds->ds_dbu, dsl_dataset_evict, &ds->ds_dbuf);
521 if (err == 0)
522 winner = dmu_buf_set_user_ie(dbuf, &ds->ds_dbu);
523
524 if (err != 0 || winner != NULL) {
525 bplist_destroy(&ds->ds_pending_deadlist);
526 dsl_deadlist_close(&ds->ds_deadlist);
527 if (ds->ds_prev)
528 dsl_dataset_rele(ds->ds_prev, ds);
529 dsl_dir_rele(ds->ds_dir, ds);
530 mutex_destroy(&ds->ds_lock);
531 mutex_destroy(&ds->ds_opening_lock);
532 mutex_destroy(&ds->ds_sendstream_lock);
533 refcount_destroy(&ds->ds_longholds);
534 kmem_free(ds, sizeof (dsl_dataset_t));
535 if (err != 0) {
536 dmu_buf_rele(dbuf, tag);
537 return (err);
538 }
539 ds = winner;
540 } else {
541 ds->ds_fsid_guid =
542 unique_insert(dsl_dataset_phys(ds)->ds_fsid_guid);
543 }
544 }
545 ASSERT3P(ds->ds_dbuf, ==, dbuf);
546 ASSERT3P(dsl_dataset_phys(ds), ==, dbuf->db_data);
547 ASSERT(dsl_dataset_phys(ds)->ds_prev_snap_obj != 0 ||
548 spa_version(dp->dp_spa) < SPA_VERSION_ORIGIN ||
549 dp->dp_origin_snap == NULL || ds == dp->dp_origin_snap);
550 *dsp = ds;
551 return (0);
552 }
553
554 int
555 dsl_dataset_hold(dsl_pool_t *dp, const char *name,
556 void *tag, dsl_dataset_t **dsp)
557 {
558 dsl_dir_t *dd;
559 const char *snapname;
560 uint64_t obj;
561 int err = 0;
562 dsl_dataset_t *ds;
563
564 err = dsl_dir_hold(dp, name, FTAG, &dd, &snapname);
565 if (err != 0)
566 return (err);
567
568 ASSERT(dsl_pool_config_held(dp));
569 obj = dsl_dir_phys(dd)->dd_head_dataset_obj;
570 if (obj != 0)
571 err = dsl_dataset_hold_obj(dp, obj, tag, &ds);
572 else
573 err = SET_ERROR(ENOENT);
574
575 /* we may be looking for a snapshot */
576 if (err == 0 && snapname != NULL) {
577 dsl_dataset_t *snap_ds;
578
579 if (*snapname++ != '@') {
580 dsl_dataset_rele(ds, tag);
581 dsl_dir_rele(dd, FTAG);
582 return (SET_ERROR(ENOENT));
583 }
584
585 dprintf("looking for snapshot '%s'\n", snapname);
586 err = dsl_dataset_snap_lookup(ds, snapname, &obj);
587 if (err == 0)
588 err = dsl_dataset_hold_obj(dp, obj, tag, &snap_ds);
589 dsl_dataset_rele(ds, tag);
590
591 if (err == 0) {
592 mutex_enter(&snap_ds->ds_lock);
593 if (snap_ds->ds_snapname[0] == 0)
594 (void) strlcpy(snap_ds->ds_snapname, snapname,
595 sizeof (snap_ds->ds_snapname));
596 mutex_exit(&snap_ds->ds_lock);
597 ds = snap_ds;
598 }
599 }
600 if (err == 0)
601 *dsp = ds;
602 dsl_dir_rele(dd, FTAG);
603 return (err);
604 }
605
606 int
607 dsl_dataset_own_obj(dsl_pool_t *dp, uint64_t dsobj,
608 void *tag, dsl_dataset_t **dsp)
609 {
610 int err = dsl_dataset_hold_obj(dp, dsobj, tag, dsp);
611 if (err != 0)
612 return (err);
613 if (!dsl_dataset_tryown(*dsp, tag)) {
614 dsl_dataset_rele(*dsp, tag);
615 *dsp = NULL;
616 return (SET_ERROR(EBUSY));
617 }
618 return (0);
619 }
620
621 int
622 dsl_dataset_own(dsl_pool_t *dp, const char *name,
623 void *tag, dsl_dataset_t **dsp)
624 {
625 int err = dsl_dataset_hold(dp, name, tag, dsp);
626 if (err != 0)
627 return (err);
628 if (!dsl_dataset_tryown(*dsp, tag)) {
629 dsl_dataset_rele(*dsp, tag);
630 return (SET_ERROR(EBUSY));
631 }
632 return (0);
633 }
634
635 /*
636 * See the comment above dsl_pool_hold() for details. In summary, a long
637 * hold is used to prevent destruction of a dataset while the pool hold
638 * is dropped, allowing other concurrent operations (e.g. spa_sync()).
639 *
640 * The dataset and pool must be held when this function is called. After it
641 * is called, the pool hold may be released while the dataset is still held
642 * and accessed.
643 */
644 void
645 dsl_dataset_long_hold(dsl_dataset_t *ds, void *tag)
646 {
647 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool));
648 (void) refcount_add(&ds->ds_longholds, tag);
649 }
650
651 void
652 dsl_dataset_long_rele(dsl_dataset_t *ds, void *tag)
653 {
654 (void) refcount_remove(&ds->ds_longholds, tag);
655 }
656
657 /* Return B_TRUE if there are any long holds on this dataset. */
658 boolean_t
659 dsl_dataset_long_held(dsl_dataset_t *ds)
660 {
661 return (!refcount_is_zero(&ds->ds_longholds));
662 }
663
664 void
665 dsl_dataset_name(dsl_dataset_t *ds, char *name)
666 {
667 if (ds == NULL) {
668 (void) strcpy(name, "mos");
669 } else {
670 dsl_dir_name(ds->ds_dir, name);
671 VERIFY0(dsl_dataset_get_snapname(ds));
672 if (ds->ds_snapname[0]) {
673 VERIFY3U(strlcat(name, "@", ZFS_MAX_DATASET_NAME_LEN),
674 <, ZFS_MAX_DATASET_NAME_LEN);
675 /*
676 * We use a "recursive" mutex so that we
677 * can call dprintf_ds() with ds_lock held.
678 */
679 if (!MUTEX_HELD(&ds->ds_lock)) {
680 mutex_enter(&ds->ds_lock);
681 VERIFY3U(strlcat(name, ds->ds_snapname,
682 ZFS_MAX_DATASET_NAME_LEN), <,
683 ZFS_MAX_DATASET_NAME_LEN);
684 mutex_exit(&ds->ds_lock);
685 } else {
686 VERIFY3U(strlcat(name, ds->ds_snapname,
687 ZFS_MAX_DATASET_NAME_LEN), <,
688 ZFS_MAX_DATASET_NAME_LEN);
689 }
690 }
691 }
692 }
693
694 int
695 dsl_dataset_namelen(dsl_dataset_t *ds)
696 {
697 int len;
698 VERIFY0(dsl_dataset_get_snapname(ds));
699 mutex_enter(&ds->ds_lock);
700 len = dsl_dir_namelen(ds->ds_dir) + 1 + strlen(ds->ds_snapname);
701 mutex_exit(&ds->ds_lock);
702 return (len);
703 }
704
705 void
706 dsl_dataset_rele(dsl_dataset_t *ds, void *tag)
707 {
708 dmu_buf_rele(ds->ds_dbuf, tag);
709 }
710
711 void
712 dsl_dataset_disown(dsl_dataset_t *ds, void *tag)
713 {
714 ASSERT3P(ds->ds_owner, ==, tag);
715 ASSERT(ds->ds_dbuf != NULL);
716
717 mutex_enter(&ds->ds_lock);
718 ds->ds_owner = NULL;
719 mutex_exit(&ds->ds_lock);
720 dsl_dataset_long_rele(ds, tag);
721 dsl_dataset_rele(ds, tag);
722 }
723
724 boolean_t
725 dsl_dataset_tryown(dsl_dataset_t *ds, void *tag)
726 {
727 boolean_t gotit = FALSE;
728
729 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool));
730 mutex_enter(&ds->ds_lock);
731 if (ds->ds_owner == NULL && !DS_IS_INCONSISTENT(ds)) {
732 ds->ds_owner = tag;
733 dsl_dataset_long_hold(ds, tag);
734 gotit = TRUE;
735 }
736 mutex_exit(&ds->ds_lock);
737 return (gotit);
738 }
739
740 boolean_t
741 dsl_dataset_has_owner(dsl_dataset_t *ds)
742 {
743 boolean_t rv;
744 mutex_enter(&ds->ds_lock);
745 rv = (ds->ds_owner != NULL);
746 mutex_exit(&ds->ds_lock);
747 return (rv);
748 }
749
750 static void
751 dsl_dataset_activate_feature(uint64_t dsobj, spa_feature_t f, dmu_tx_t *tx)
752 {
753 spa_t *spa = dmu_tx_pool(tx)->dp_spa;
754 objset_t *mos = dmu_tx_pool(tx)->dp_meta_objset;
755 uint64_t zero = 0;
756
757 VERIFY(spa_feature_table[f].fi_flags & ZFEATURE_FLAG_PER_DATASET);
758
759 spa_feature_incr(spa, f, tx);
760 dmu_object_zapify(mos, dsobj, DMU_OT_DSL_DATASET, tx);
761
762 VERIFY0(zap_add(mos, dsobj, spa_feature_table[f].fi_guid,
763 sizeof (zero), 1, &zero, tx));
764 }
765
766 void
767 dsl_dataset_deactivate_feature(uint64_t dsobj, spa_feature_t f, dmu_tx_t *tx)
768 {
769 spa_t *spa = dmu_tx_pool(tx)->dp_spa;
770 objset_t *mos = dmu_tx_pool(tx)->dp_meta_objset;
771
772 VERIFY(spa_feature_table[f].fi_flags & ZFEATURE_FLAG_PER_DATASET);
773
774 VERIFY0(zap_remove(mos, dsobj, spa_feature_table[f].fi_guid, tx));
775 spa_feature_decr(spa, f, tx);
776 }
777
778 uint64_t
779 dsl_dataset_create_sync_dd(dsl_dir_t *dd, dsl_dataset_t *origin,
780 uint64_t flags, dmu_tx_t *tx)
781 {
782 dsl_pool_t *dp = dd->dd_pool;
783 dmu_buf_t *dbuf;
784 dsl_dataset_phys_t *dsphys;
785 uint64_t dsobj;
786 objset_t *mos = dp->dp_meta_objset;
787
788 if (origin == NULL)
789 origin = dp->dp_origin_snap;
790
791 ASSERT(origin == NULL || origin->ds_dir->dd_pool == dp);
792 ASSERT(origin == NULL || dsl_dataset_phys(origin)->ds_num_children > 0);
793 ASSERT(dmu_tx_is_syncing(tx));
794 ASSERT(dsl_dir_phys(dd)->dd_head_dataset_obj == 0);
795
796 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0,
797 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx);
798 VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf));
799 dmu_buf_will_dirty(dbuf, tx);
800 dsphys = dbuf->db_data;
801 bzero(dsphys, sizeof (dsl_dataset_phys_t));
802 dsphys->ds_dir_obj = dd->dd_object;
803 dsphys->ds_flags = flags;
804 dsphys->ds_fsid_guid = unique_create();
805 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid,
806 sizeof (dsphys->ds_guid));
807 dsphys->ds_snapnames_zapobj =
808 zap_create_norm(mos, U8_TEXTPREP_TOUPPER, DMU_OT_DSL_DS_SNAP_MAP,
809 DMU_OT_NONE, 0, tx);
810 dsphys->ds_creation_time = gethrestime_sec();
811 dsphys->ds_creation_txg = tx->tx_txg == TXG_INITIAL ? 1 : tx->tx_txg;
812
813 if (origin == NULL) {
814 dsphys->ds_deadlist_obj = dsl_deadlist_alloc(mos, tx);
815 } else {
816 spa_feature_t f;
817 dsl_dataset_t *ohds; /* head of the origin snapshot */
818
819 dsphys->ds_prev_snap_obj = origin->ds_object;
820 dsphys->ds_prev_snap_txg =
821 dsl_dataset_phys(origin)->ds_creation_txg;
822 dsphys->ds_referenced_bytes =
823 dsl_dataset_phys(origin)->ds_referenced_bytes;
824 dsphys->ds_compressed_bytes =
825 dsl_dataset_phys(origin)->ds_compressed_bytes;
826 dsphys->ds_uncompressed_bytes =
827 dsl_dataset_phys(origin)->ds_uncompressed_bytes;
828 dsphys->ds_bp = dsl_dataset_phys(origin)->ds_bp;
829
830 /*
831 * Inherit flags that describe the dataset's contents
832 * (INCONSISTENT) or properties (Case Insensitive).
833 */
834 dsphys->ds_flags |= dsl_dataset_phys(origin)->ds_flags &
835 (DS_FLAG_INCONSISTENT | DS_FLAG_CI_DATASET);
836
837 for (f = 0; f < SPA_FEATURES; f++) {
838 if (origin->ds_feature_inuse[f])
839 dsl_dataset_activate_feature(dsobj, f, tx);
840 }
841
842 dmu_buf_will_dirty(origin->ds_dbuf, tx);
843 dsl_dataset_phys(origin)->ds_num_children++;
844
845 VERIFY0(dsl_dataset_hold_obj(dp,
846 dsl_dir_phys(origin->ds_dir)->dd_head_dataset_obj,
847 FTAG, &ohds));
848 dsphys->ds_deadlist_obj = dsl_deadlist_clone(&ohds->ds_deadlist,
849 dsphys->ds_prev_snap_txg, dsphys->ds_prev_snap_obj, tx);
850 dsl_dataset_rele(ohds, FTAG);
851
852 if (spa_version(dp->dp_spa) >= SPA_VERSION_NEXT_CLONES) {
853 if (dsl_dataset_phys(origin)->ds_next_clones_obj == 0) {
854 dsl_dataset_phys(origin)->ds_next_clones_obj =
855 zap_create(mos,
856 DMU_OT_NEXT_CLONES, DMU_OT_NONE, 0, tx);
857 }
858 VERIFY0(zap_add_int(mos,
859 dsl_dataset_phys(origin)->ds_next_clones_obj,
860 dsobj, tx));
861 }
862
863 dmu_buf_will_dirty(dd->dd_dbuf, tx);
864 dsl_dir_phys(dd)->dd_origin_obj = origin->ds_object;
865 if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) {
866 if (dsl_dir_phys(origin->ds_dir)->dd_clones == 0) {
867 dmu_buf_will_dirty(origin->ds_dir->dd_dbuf, tx);
868 dsl_dir_phys(origin->ds_dir)->dd_clones =
869 zap_create(mos,
870 DMU_OT_DSL_CLONES, DMU_OT_NONE, 0, tx);
871 }
872 VERIFY0(zap_add_int(mos,
873 dsl_dir_phys(origin->ds_dir)->dd_clones,
874 dsobj, tx));
875 }
876 }
877
878 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE)
879 dsphys->ds_flags |= DS_FLAG_UNIQUE_ACCURATE;
880
881 dmu_buf_rele(dbuf, FTAG);
882
883 dmu_buf_will_dirty(dd->dd_dbuf, tx);
884 dsl_dir_phys(dd)->dd_head_dataset_obj = dsobj;
885
886 return (dsobj);
887 }
888
889 static void
890 dsl_dataset_zero_zil(dsl_dataset_t *ds, dmu_tx_t *tx)
891 {
892 objset_t *os;
893
894 VERIFY0(dmu_objset_from_ds(ds, &os));
895 bzero(&os->os_zil_header, sizeof (os->os_zil_header));
896 dsl_dataset_dirty(ds, tx);
897 }
898
899 uint64_t
900 dsl_dataset_create_sync(dsl_dir_t *pdd, const char *lastname,
901 dsl_dataset_t *origin, uint64_t flags, cred_t *cr, dmu_tx_t *tx)
902 {
903 dsl_pool_t *dp = pdd->dd_pool;
904 uint64_t dsobj, ddobj;
905 dsl_dir_t *dd;
906
907 ASSERT(dmu_tx_is_syncing(tx));
908 ASSERT(lastname[0] != '@');
909
910 ddobj = dsl_dir_create_sync(dp, pdd, lastname, tx);
911 VERIFY0(dsl_dir_hold_obj(dp, ddobj, lastname, FTAG, &dd));
912
913 dsobj = dsl_dataset_create_sync_dd(dd, origin,
914 flags & ~DS_CREATE_FLAG_NODIRTY, tx);
915
916 dsl_deleg_set_create_perms(dd, tx, cr);
917
918 /*
919 * Since we're creating a new node we know it's a leaf, so we can
920 * initialize the counts if the limit feature is active.
921 */
922 if (spa_feature_is_active(dp->dp_spa, SPA_FEATURE_FS_SS_LIMIT)) {
923 uint64_t cnt = 0;
924 objset_t *os = dd->dd_pool->dp_meta_objset;
925
926 dsl_dir_zapify(dd, tx);
927 VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_FILESYSTEM_COUNT,
928 sizeof (cnt), 1, &cnt, tx));
929 VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_SNAPSHOT_COUNT,
930 sizeof (cnt), 1, &cnt, tx));
931 }
932
933 dsl_dir_rele(dd, FTAG);
934
935 /*
936 * If we are creating a clone, make sure we zero out any stale
937 * data from the origin snapshots zil header.
938 */
939 if (origin != NULL && !(flags & DS_CREATE_FLAG_NODIRTY)) {
940 dsl_dataset_t *ds;
941
942 VERIFY0(dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds));
943 dsl_dataset_zero_zil(ds, tx);
944 dsl_dataset_rele(ds, FTAG);
945 }
946
947 return (dsobj);
948 }
949
950 /*
951 * The unique space in the head dataset can be calculated by subtracting
952 * the space used in the most recent snapshot, that is still being used
953 * in this file system, from the space currently in use. To figure out
954 * the space in the most recent snapshot still in use, we need to take
955 * the total space used in the snapshot and subtract out the space that
956 * has been freed up since the snapshot was taken.
957 */
958 void
959 dsl_dataset_recalc_head_uniq(dsl_dataset_t *ds)
960 {
961 uint64_t mrs_used;
962 uint64_t dlused, dlcomp, dluncomp;
963
964 ASSERT(!ds->ds_is_snapshot);
965
966 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0)
967 mrs_used = dsl_dataset_phys(ds->ds_prev)->ds_referenced_bytes;
968 else
969 mrs_used = 0;
970
971 dsl_deadlist_space(&ds->ds_deadlist, &dlused, &dlcomp, &dluncomp);
972
973 ASSERT3U(dlused, <=, mrs_used);
974 dsl_dataset_phys(ds)->ds_unique_bytes =
975 dsl_dataset_phys(ds)->ds_referenced_bytes - (mrs_used - dlused);
976
977 if (spa_version(ds->ds_dir->dd_pool->dp_spa) >=
978 SPA_VERSION_UNIQUE_ACCURATE)
979 dsl_dataset_phys(ds)->ds_flags |= DS_FLAG_UNIQUE_ACCURATE;
980 }
981
982 void
983 dsl_dataset_remove_from_next_clones(dsl_dataset_t *ds, uint64_t obj,
984 dmu_tx_t *tx)
985 {
986 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
987 int err;
988 ASSERTV(uint64_t count);
989
990 ASSERT(dsl_dataset_phys(ds)->ds_num_children >= 2);
991 err = zap_remove_int(mos, dsl_dataset_phys(ds)->ds_next_clones_obj,
992 obj, tx);
993 /*
994 * The err should not be ENOENT, but a bug in a previous version
995 * of the code could cause upgrade_clones_cb() to not set
996 * ds_next_snap_obj when it should, leading to a missing entry.
997 * If we knew that the pool was created after
998 * SPA_VERSION_NEXT_CLONES, we could assert that it isn't
999 * ENOENT. However, at least we can check that we don't have
1000 * too many entries in the next_clones_obj even after failing to
1001 * remove this one.
1002 */
1003 if (err != ENOENT)
1004 VERIFY0(err);
1005 ASSERT0(zap_count(mos, dsl_dataset_phys(ds)->ds_next_clones_obj,
1006 &count));
1007 ASSERT3U(count, <=, dsl_dataset_phys(ds)->ds_num_children - 2);
1008 }
1009
1010
1011 blkptr_t *
1012 dsl_dataset_get_blkptr(dsl_dataset_t *ds)
1013 {
1014 return (&dsl_dataset_phys(ds)->ds_bp);
1015 }
1016
1017 void
1018 dsl_dataset_set_blkptr(dsl_dataset_t *ds, blkptr_t *bp, dmu_tx_t *tx)
1019 {
1020 ASSERT(dmu_tx_is_syncing(tx));
1021 /* If it's the meta-objset, set dp_meta_rootbp */
1022 if (ds == NULL) {
1023 tx->tx_pool->dp_meta_rootbp = *bp;
1024 } else {
1025 dmu_buf_will_dirty(ds->ds_dbuf, tx);
1026 dsl_dataset_phys(ds)->ds_bp = *bp;
1027 }
1028 }
1029
1030 spa_t *
1031 dsl_dataset_get_spa(dsl_dataset_t *ds)
1032 {
1033 return (ds->ds_dir->dd_pool->dp_spa);
1034 }
1035
1036 void
1037 dsl_dataset_dirty(dsl_dataset_t *ds, dmu_tx_t *tx)
1038 {
1039 dsl_pool_t *dp;
1040
1041 if (ds == NULL) /* this is the meta-objset */
1042 return;
1043
1044 ASSERT(ds->ds_objset != NULL);
1045
1046 if (dsl_dataset_phys(ds)->ds_next_snap_obj != 0)
1047 panic("dirtying snapshot!");
1048
1049 dp = ds->ds_dir->dd_pool;
1050
1051 if (txg_list_add(&dp->dp_dirty_datasets, ds, tx->tx_txg)) {
1052 /* up the hold count until we can be written out */
1053 dmu_buf_add_ref(ds->ds_dbuf, ds);
1054 }
1055 }
1056
1057 boolean_t
1058 dsl_dataset_is_dirty(dsl_dataset_t *ds)
1059 {
1060 int t;
1061
1062 for (t = 0; t < TXG_SIZE; t++) {
1063 if (txg_list_member(&ds->ds_dir->dd_pool->dp_dirty_datasets,
1064 ds, t))
1065 return (B_TRUE);
1066 }
1067 return (B_FALSE);
1068 }
1069
1070 static int
1071 dsl_dataset_snapshot_reserve_space(dsl_dataset_t *ds, dmu_tx_t *tx)
1072 {
1073 uint64_t asize;
1074
1075 if (!dmu_tx_is_syncing(tx))
1076 return (0);
1077
1078 /*
1079 * If there's an fs-only reservation, any blocks that might become
1080 * owned by the snapshot dataset must be accommodated by space
1081 * outside of the reservation.
1082 */
1083 ASSERT(ds->ds_reserved == 0 || DS_UNIQUE_IS_ACCURATE(ds));
1084 asize = MIN(dsl_dataset_phys(ds)->ds_unique_bytes, ds->ds_reserved);
1085 if (asize > dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE))
1086 return (SET_ERROR(ENOSPC));
1087
1088 /*
1089 * Propagate any reserved space for this snapshot to other
1090 * snapshot checks in this sync group.
1091 */
1092 if (asize > 0)
1093 dsl_dir_willuse_space(ds->ds_dir, asize, tx);
1094
1095 return (0);
1096 }
1097
1098 typedef struct dsl_dataset_snapshot_arg {
1099 nvlist_t *ddsa_snaps;
1100 nvlist_t *ddsa_props;
1101 nvlist_t *ddsa_errors;
1102 cred_t *ddsa_cr;
1103 } dsl_dataset_snapshot_arg_t;
1104
1105 int
1106 dsl_dataset_snapshot_check_impl(dsl_dataset_t *ds, const char *snapname,
1107 dmu_tx_t *tx, boolean_t recv, uint64_t cnt, cred_t *cr)
1108 {
1109 int error;
1110 uint64_t value;
1111
1112 ds->ds_trysnap_txg = tx->tx_txg;
1113
1114 if (!dmu_tx_is_syncing(tx))
1115 return (0);
1116
1117 /*
1118 * We don't allow multiple snapshots of the same txg. If there
1119 * is already one, try again.
1120 */
1121 if (dsl_dataset_phys(ds)->ds_prev_snap_txg >= tx->tx_txg)
1122 return (SET_ERROR(EAGAIN));
1123
1124 /*
1125 * Check for conflicting snapshot name.
1126 */
1127 error = dsl_dataset_snap_lookup(ds, snapname, &value);
1128 if (error == 0)
1129 return (SET_ERROR(EEXIST));
1130 if (error != ENOENT)
1131 return (error);
1132
1133 /*
1134 * We don't allow taking snapshots of inconsistent datasets, such as
1135 * those into which we are currently receiving. However, if we are
1136 * creating this snapshot as part of a receive, this check will be
1137 * executed atomically with respect to the completion of the receive
1138 * itself but prior to the clearing of DS_FLAG_INCONSISTENT; in this
1139 * case we ignore this, knowing it will be fixed up for us shortly in
1140 * dmu_recv_end_sync().
1141 */
1142 if (!recv && DS_IS_INCONSISTENT(ds))
1143 return (SET_ERROR(EBUSY));
1144
1145 /*
1146 * Skip the check for temporary snapshots or if we have already checked
1147 * the counts in dsl_dataset_snapshot_check. This means we really only
1148 * check the count here when we're receiving a stream.
1149 */
1150 if (cnt != 0 && cr != NULL) {
1151 error = dsl_fs_ss_limit_check(ds->ds_dir, cnt,
1152 ZFS_PROP_SNAPSHOT_LIMIT, NULL, cr);
1153 if (error != 0)
1154 return (error);
1155 }
1156
1157 error = dsl_dataset_snapshot_reserve_space(ds, tx);
1158 if (error != 0)
1159 return (error);
1160
1161 return (0);
1162 }
1163
1164 static int
1165 dsl_dataset_snapshot_check(void *arg, dmu_tx_t *tx)
1166 {
1167 dsl_dataset_snapshot_arg_t *ddsa = arg;
1168 dsl_pool_t *dp = dmu_tx_pool(tx);
1169 nvpair_t *pair;
1170 int rv = 0;
1171
1172 /*
1173 * Pre-compute how many total new snapshots will be created for each
1174 * level in the tree and below. This is needed for validating the
1175 * snapshot limit when either taking a recursive snapshot or when
1176 * taking multiple snapshots.
1177 *
1178 * The problem is that the counts are not actually adjusted when
1179 * we are checking, only when we finally sync. For a single snapshot,
1180 * this is easy, the count will increase by 1 at each node up the tree,
1181 * but its more complicated for the recursive/multiple snapshot case.
1182 *
1183 * The dsl_fs_ss_limit_check function does recursively check the count
1184 * at each level up the tree but since it is validating each snapshot
1185 * independently we need to be sure that we are validating the complete
1186 * count for the entire set of snapshots. We do this by rolling up the
1187 * counts for each component of the name into an nvlist and then
1188 * checking each of those cases with the aggregated count.
1189 *
1190 * This approach properly handles not only the recursive snapshot
1191 * case (where we get all of those on the ddsa_snaps list) but also
1192 * the sibling case (e.g. snapshot a/b and a/c so that we will also
1193 * validate the limit on 'a' using a count of 2).
1194 *
1195 * We validate the snapshot names in the third loop and only report
1196 * name errors once.
1197 */
1198 if (dmu_tx_is_syncing(tx)) {
1199 char *nm;
1200 nvlist_t *cnt_track = NULL;
1201 cnt_track = fnvlist_alloc();
1202
1203 nm = kmem_alloc(MAXPATHLEN, KM_SLEEP);
1204
1205 /* Rollup aggregated counts into the cnt_track list */
1206 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL);
1207 pair != NULL;
1208 pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) {
1209 char *pdelim;
1210 uint64_t val;
1211
1212 (void) strlcpy(nm, nvpair_name(pair), MAXPATHLEN);
1213 pdelim = strchr(nm, '@');
1214 if (pdelim == NULL)
1215 continue;
1216 *pdelim = '\0';
1217
1218 do {
1219 if (nvlist_lookup_uint64(cnt_track, nm,
1220 &val) == 0) {
1221 /* update existing entry */
1222 fnvlist_add_uint64(cnt_track, nm,
1223 val + 1);
1224 } else {
1225 /* add to list */
1226 fnvlist_add_uint64(cnt_track, nm, 1);
1227 }
1228
1229 pdelim = strrchr(nm, '/');
1230 if (pdelim != NULL)
1231 *pdelim = '\0';
1232 } while (pdelim != NULL);
1233 }
1234
1235 kmem_free(nm, MAXPATHLEN);
1236
1237 /* Check aggregated counts at each level */
1238 for (pair = nvlist_next_nvpair(cnt_track, NULL);
1239 pair != NULL; pair = nvlist_next_nvpair(cnt_track, pair)) {
1240 int error = 0;
1241 char *name;
1242 uint64_t cnt = 0;
1243 dsl_dataset_t *ds;
1244
1245 name = nvpair_name(pair);
1246 cnt = fnvpair_value_uint64(pair);
1247 ASSERT(cnt > 0);
1248
1249 error = dsl_dataset_hold(dp, name, FTAG, &ds);
1250 if (error == 0) {
1251 error = dsl_fs_ss_limit_check(ds->ds_dir, cnt,
1252 ZFS_PROP_SNAPSHOT_LIMIT, NULL,
1253 ddsa->ddsa_cr);
1254 dsl_dataset_rele(ds, FTAG);
1255 }
1256
1257 if (error != 0) {
1258 if (ddsa->ddsa_errors != NULL)
1259 fnvlist_add_int32(ddsa->ddsa_errors,
1260 name, error);
1261 rv = error;
1262 /* only report one error for this check */
1263 break;
1264 }
1265 }
1266 nvlist_free(cnt_track);
1267 }
1268
1269 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL);
1270 pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) {
1271 int error = 0;
1272 dsl_dataset_t *ds;
1273 char *name, *atp = NULL;
1274 char dsname[ZFS_MAX_DATASET_NAME_LEN];
1275
1276 name = nvpair_name(pair);
1277 if (strlen(name) >= ZFS_MAX_DATASET_NAME_LEN)
1278 error = SET_ERROR(ENAMETOOLONG);
1279 if (error == 0) {
1280 atp = strchr(name, '@');
1281 if (atp == NULL)
1282 error = SET_ERROR(EINVAL);
1283 if (error == 0)
1284 (void) strlcpy(dsname, name, atp - name + 1);
1285 }
1286 if (error == 0)
1287 error = dsl_dataset_hold(dp, dsname, FTAG, &ds);
1288 if (error == 0) {
1289 /* passing 0/NULL skips dsl_fs_ss_limit_check */
1290 error = dsl_dataset_snapshot_check_impl(ds,
1291 atp + 1, tx, B_FALSE, 0, NULL);
1292 dsl_dataset_rele(ds, FTAG);
1293 }
1294
1295 if (error != 0) {
1296 if (ddsa->ddsa_errors != NULL) {
1297 fnvlist_add_int32(ddsa->ddsa_errors,
1298 name, error);
1299 }
1300 rv = error;
1301 }
1302 }
1303
1304 return (rv);
1305 }
1306
1307 void
1308 dsl_dataset_snapshot_sync_impl(dsl_dataset_t *ds, const char *snapname,
1309 dmu_tx_t *tx)
1310 {
1311 dsl_pool_t *dp = ds->ds_dir->dd_pool;
1312 dmu_buf_t *dbuf;
1313 dsl_dataset_phys_t *dsphys;
1314 uint64_t dsobj, crtxg;
1315 objset_t *mos = dp->dp_meta_objset;
1316 spa_feature_t f;
1317 ASSERTV(static zil_header_t zero_zil);
1318 ASSERTV(objset_t *os);
1319
1320 ASSERT(RRW_WRITE_HELD(&dp->dp_config_rwlock));
1321
1322 /*
1323 * If we are on an old pool, the zil must not be active, in which
1324 * case it will be zeroed. Usually zil_suspend() accomplishes this.
1325 */
1326 ASSERT(spa_version(dmu_tx_pool(tx)->dp_spa) >= SPA_VERSION_FAST_SNAP ||
1327 dmu_objset_from_ds(ds, &os) != 0 ||
1328 bcmp(&os->os_phys->os_zil_header, &zero_zil,
1329 sizeof (zero_zil)) == 0);
1330
1331 dsl_fs_ss_count_adjust(ds->ds_dir, 1, DD_FIELD_SNAPSHOT_COUNT, tx);
1332
1333 /*
1334 * The origin's ds_creation_txg has to be < TXG_INITIAL
1335 */
1336 if (strcmp(snapname, ORIGIN_DIR_NAME) == 0)
1337 crtxg = 1;
1338 else
1339 crtxg = tx->tx_txg;
1340
1341 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0,
1342 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx);
1343 VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf));
1344 dmu_buf_will_dirty(dbuf, tx);
1345 dsphys = dbuf->db_data;
1346 bzero(dsphys, sizeof (dsl_dataset_phys_t));
1347 dsphys->ds_dir_obj = ds->ds_dir->dd_object;
1348 dsphys->ds_fsid_guid = unique_create();
1349 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid,
1350 sizeof (dsphys->ds_guid));
1351 dsphys->ds_prev_snap_obj = dsl_dataset_phys(ds)->ds_prev_snap_obj;
1352 dsphys->ds_prev_snap_txg = dsl_dataset_phys(ds)->ds_prev_snap_txg;
1353 dsphys->ds_next_snap_obj = ds->ds_object;
1354 dsphys->ds_num_children = 1;
1355 dsphys->ds_creation_time = gethrestime_sec();
1356 dsphys->ds_creation_txg = crtxg;
1357 dsphys->ds_deadlist_obj = dsl_dataset_phys(ds)->ds_deadlist_obj;
1358 dsphys->ds_referenced_bytes = dsl_dataset_phys(ds)->ds_referenced_bytes;
1359 dsphys->ds_compressed_bytes = dsl_dataset_phys(ds)->ds_compressed_bytes;
1360 dsphys->ds_uncompressed_bytes =
1361 dsl_dataset_phys(ds)->ds_uncompressed_bytes;
1362 dsphys->ds_flags = dsl_dataset_phys(ds)->ds_flags;
1363 dsphys->ds_bp = dsl_dataset_phys(ds)->ds_bp;
1364 dmu_buf_rele(dbuf, FTAG);
1365
1366 for (f = 0; f < SPA_FEATURES; f++) {
1367 if (ds->ds_feature_inuse[f])
1368 dsl_dataset_activate_feature(dsobj, f, tx);
1369 }
1370
1371 ASSERT3U(ds->ds_prev != 0, ==,
1372 dsl_dataset_phys(ds)->ds_prev_snap_obj != 0);
1373 if (ds->ds_prev) {
1374 uint64_t next_clones_obj =
1375 dsl_dataset_phys(ds->ds_prev)->ds_next_clones_obj;
1376 ASSERT(dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj ==
1377 ds->ds_object ||
1378 dsl_dataset_phys(ds->ds_prev)->ds_num_children > 1);
1379 if (dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj ==
1380 ds->ds_object) {
1381 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx);
1382 ASSERT3U(dsl_dataset_phys(ds)->ds_prev_snap_txg, ==,
1383 dsl_dataset_phys(ds->ds_prev)->ds_creation_txg);
1384 dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj = dsobj;
1385 } else if (next_clones_obj != 0) {
1386 dsl_dataset_remove_from_next_clones(ds->ds_prev,
1387 dsphys->ds_next_snap_obj, tx);
1388 VERIFY0(zap_add_int(mos,
1389 next_clones_obj, dsobj, tx));
1390 }
1391 }
1392
1393 /*
1394 * If we have a reference-reservation on this dataset, we will
1395 * need to increase the amount of refreservation being charged
1396 * since our unique space is going to zero.
1397 */
1398 if (ds->ds_reserved) {
1399 int64_t delta;
1400 ASSERT(DS_UNIQUE_IS_ACCURATE(ds));
1401 delta = MIN(dsl_dataset_phys(ds)->ds_unique_bytes,
1402 ds->ds_reserved);
1403 dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV,
1404 delta, 0, 0, tx);
1405 }
1406
1407 dmu_buf_will_dirty(ds->ds_dbuf, tx);
1408 dsl_dataset_phys(ds)->ds_deadlist_obj =
1409 dsl_deadlist_clone(&ds->ds_deadlist, UINT64_MAX,
1410 dsl_dataset_phys(ds)->ds_prev_snap_obj, tx);
1411 dsl_deadlist_close(&ds->ds_deadlist);
1412 dsl_deadlist_open(&ds->ds_deadlist, mos,
1413 dsl_dataset_phys(ds)->ds_deadlist_obj);
1414 dsl_deadlist_add_key(&ds->ds_deadlist,
1415 dsl_dataset_phys(ds)->ds_prev_snap_txg, tx);
1416
1417 ASSERT3U(dsl_dataset_phys(ds)->ds_prev_snap_txg, <, tx->tx_txg);
1418 dsl_dataset_phys(ds)->ds_prev_snap_obj = dsobj;
1419 dsl_dataset_phys(ds)->ds_prev_snap_txg = crtxg;
1420 dsl_dataset_phys(ds)->ds_unique_bytes = 0;
1421 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE)
1422 dsl_dataset_phys(ds)->ds_flags |= DS_FLAG_UNIQUE_ACCURATE;
1423
1424 VERIFY0(zap_add(mos, dsl_dataset_phys(ds)->ds_snapnames_zapobj,
1425 snapname, 8, 1, &dsobj, tx));
1426
1427 if (ds->ds_prev)
1428 dsl_dataset_rele(ds->ds_prev, ds);
1429 VERIFY0(dsl_dataset_hold_obj(dp,
1430 dsl_dataset_phys(ds)->ds_prev_snap_obj, ds, &ds->ds_prev));
1431
1432 dsl_scan_ds_snapshotted(ds, tx);
1433
1434 dsl_dir_snap_cmtime_update(ds->ds_dir);
1435
1436 spa_history_log_internal_ds(ds->ds_prev, "snapshot", tx, "");
1437 }
1438
1439 static void
1440 dsl_dataset_snapshot_sync(void *arg, dmu_tx_t *tx)
1441 {
1442 dsl_dataset_snapshot_arg_t *ddsa = arg;
1443 dsl_pool_t *dp = dmu_tx_pool(tx);
1444 nvpair_t *pair;
1445
1446 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL);
1447 pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) {
1448 dsl_dataset_t *ds;
1449 char *name, *atp;
1450 char dsname[ZFS_MAX_DATASET_NAME_LEN];
1451
1452 name = nvpair_name(pair);
1453 atp = strchr(name, '@');
1454 (void) strlcpy(dsname, name, atp - name + 1);
1455 VERIFY0(dsl_dataset_hold(dp, dsname, FTAG, &ds));
1456
1457 dsl_dataset_snapshot_sync_impl(ds, atp + 1, tx);
1458 if (ddsa->ddsa_props != NULL) {
1459 dsl_props_set_sync_impl(ds->ds_prev,
1460 ZPROP_SRC_LOCAL, ddsa->ddsa_props, tx);
1461 }
1462 zvol_create_minors(dp->dp_spa, nvpair_name(pair), B_TRUE);
1463 dsl_dataset_rele(ds, FTAG);
1464 }
1465 }
1466
1467 /*
1468 * The snapshots must all be in the same pool.
1469 * All-or-nothing: if there are any failures, nothing will be modified.
1470 */
1471 int
1472 dsl_dataset_snapshot(nvlist_t *snaps, nvlist_t *props, nvlist_t *errors)
1473 {
1474 dsl_dataset_snapshot_arg_t ddsa;
1475 nvpair_t *pair;
1476 boolean_t needsuspend;
1477 int error;
1478 spa_t *spa;
1479 char *firstname;
1480 nvlist_t *suspended = NULL;
1481
1482 pair = nvlist_next_nvpair(snaps, NULL);
1483 if (pair == NULL)
1484 return (0);
1485 firstname = nvpair_name(pair);
1486
1487 error = spa_open(firstname, &spa, FTAG);
1488 if (error != 0)
1489 return (error);
1490 needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP);
1491 spa_close(spa, FTAG);
1492
1493 if (needsuspend) {
1494 suspended = fnvlist_alloc();
1495 for (pair = nvlist_next_nvpair(snaps, NULL); pair != NULL;
1496 pair = nvlist_next_nvpair(snaps, pair)) {
1497 char fsname[ZFS_MAX_DATASET_NAME_LEN];
1498 char *snapname = nvpair_name(pair);
1499 char *atp;
1500 void *cookie;
1501
1502 atp = strchr(snapname, '@');
1503 if (atp == NULL) {
1504 error = SET_ERROR(EINVAL);
1505 break;
1506 }
1507 (void) strlcpy(fsname, snapname, atp - snapname + 1);
1508
1509 error = zil_suspend(fsname, &cookie);
1510 if (error != 0)
1511 break;
1512 fnvlist_add_uint64(suspended, fsname,
1513 (uintptr_t)cookie);
1514 }
1515 }
1516
1517 ddsa.ddsa_snaps = snaps;
1518 ddsa.ddsa_props = props;
1519 ddsa.ddsa_errors = errors;
1520 ddsa.ddsa_cr = CRED();
1521
1522 if (error == 0) {
1523 error = dsl_sync_task(firstname, dsl_dataset_snapshot_check,
1524 dsl_dataset_snapshot_sync, &ddsa,
1525 fnvlist_num_pairs(snaps) * 3, ZFS_SPACE_CHECK_NORMAL);
1526 }
1527
1528 if (suspended != NULL) {
1529 for (pair = nvlist_next_nvpair(suspended, NULL); pair != NULL;
1530 pair = nvlist_next_nvpair(suspended, pair)) {
1531 zil_resume((void *)(uintptr_t)
1532 fnvpair_value_uint64(pair));
1533 }
1534 fnvlist_free(suspended);
1535 }
1536
1537 return (error);
1538 }
1539
1540 typedef struct dsl_dataset_snapshot_tmp_arg {
1541 const char *ddsta_fsname;
1542 const char *ddsta_snapname;
1543 minor_t ddsta_cleanup_minor;
1544 const char *ddsta_htag;
1545 } dsl_dataset_snapshot_tmp_arg_t;
1546
1547 static int
1548 dsl_dataset_snapshot_tmp_check(void *arg, dmu_tx_t *tx)
1549 {
1550 dsl_dataset_snapshot_tmp_arg_t *ddsta = arg;
1551 dsl_pool_t *dp = dmu_tx_pool(tx);
1552 dsl_dataset_t *ds;
1553 int error;
1554
1555 error = dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds);
1556 if (error != 0)
1557 return (error);
1558
1559 /* NULL cred means no limit check for tmp snapshot */
1560 error = dsl_dataset_snapshot_check_impl(ds, ddsta->ddsta_snapname,
1561 tx, B_FALSE, 0, NULL);
1562 if (error != 0) {
1563 dsl_dataset_rele(ds, FTAG);
1564 return (error);
1565 }
1566
1567 if (spa_version(dp->dp_spa) < SPA_VERSION_USERREFS) {
1568 dsl_dataset_rele(ds, FTAG);
1569 return (SET_ERROR(ENOTSUP));
1570 }
1571 error = dsl_dataset_user_hold_check_one(NULL, ddsta->ddsta_htag,
1572 B_TRUE, tx);
1573 if (error != 0) {
1574 dsl_dataset_rele(ds, FTAG);
1575 return (error);
1576 }
1577
1578 dsl_dataset_rele(ds, FTAG);
1579 return (0);
1580 }
1581
1582 static void
1583 dsl_dataset_snapshot_tmp_sync(void *arg, dmu_tx_t *tx)
1584 {
1585 dsl_dataset_snapshot_tmp_arg_t *ddsta = arg;
1586 dsl_pool_t *dp = dmu_tx_pool(tx);
1587 dsl_dataset_t *ds = NULL;
1588
1589 VERIFY0(dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds));
1590
1591 dsl_dataset_snapshot_sync_impl(ds, ddsta->ddsta_snapname, tx);
1592 dsl_dataset_user_hold_sync_one(ds->ds_prev, ddsta->ddsta_htag,
1593 ddsta->ddsta_cleanup_minor, gethrestime_sec(), tx);
1594 dsl_destroy_snapshot_sync_impl(ds->ds_prev, B_TRUE, tx);
1595
1596 dsl_dataset_rele(ds, FTAG);
1597 }
1598
1599 int
1600 dsl_dataset_snapshot_tmp(const char *fsname, const char *snapname,
1601 minor_t cleanup_minor, const char *htag)
1602 {
1603 dsl_dataset_snapshot_tmp_arg_t ddsta;
1604 int error;
1605 spa_t *spa;
1606 boolean_t needsuspend;
1607 void *cookie;
1608
1609 ddsta.ddsta_fsname = fsname;
1610 ddsta.ddsta_snapname = snapname;
1611 ddsta.ddsta_cleanup_minor = cleanup_minor;
1612 ddsta.ddsta_htag = htag;
1613
1614 error = spa_open(fsname, &spa, FTAG);
1615 if (error != 0)
1616 return (error);
1617 needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP);
1618 spa_close(spa, FTAG);
1619
1620 if (needsuspend) {
1621 error = zil_suspend(fsname, &cookie);
1622 if (error != 0)
1623 return (error);
1624 }
1625
1626 error = dsl_sync_task(fsname, dsl_dataset_snapshot_tmp_check,
1627 dsl_dataset_snapshot_tmp_sync, &ddsta, 3, ZFS_SPACE_CHECK_RESERVED);
1628
1629 if (needsuspend)
1630 zil_resume(cookie);
1631 return (error);
1632 }
1633
1634
1635 void
1636 dsl_dataset_sync(dsl_dataset_t *ds, zio_t *zio, dmu_tx_t *tx)
1637 {
1638 spa_feature_t f;
1639
1640 ASSERT(dmu_tx_is_syncing(tx));
1641 ASSERT(ds->ds_objset != NULL);
1642 ASSERT(dsl_dataset_phys(ds)->ds_next_snap_obj == 0);
1643
1644 /*
1645 * in case we had to change ds_fsid_guid when we opened it,
1646 * sync it out now.
1647 */
1648 dmu_buf_will_dirty(ds->ds_dbuf, tx);
1649 dsl_dataset_phys(ds)->ds_fsid_guid = ds->ds_fsid_guid;
1650
1651 if (ds->ds_resume_bytes[tx->tx_txg & TXG_MASK] != 0) {
1652 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset,
1653 ds->ds_object, DS_FIELD_RESUME_OBJECT, 8, 1,
1654 &ds->ds_resume_object[tx->tx_txg & TXG_MASK], tx));
1655 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset,
1656 ds->ds_object, DS_FIELD_RESUME_OFFSET, 8, 1,
1657 &ds->ds_resume_offset[tx->tx_txg & TXG_MASK], tx));
1658 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset,
1659 ds->ds_object, DS_FIELD_RESUME_BYTES, 8, 1,
1660 &ds->ds_resume_bytes[tx->tx_txg & TXG_MASK], tx));
1661 ds->ds_resume_object[tx->tx_txg & TXG_MASK] = 0;
1662 ds->ds_resume_offset[tx->tx_txg & TXG_MASK] = 0;
1663 ds->ds_resume_bytes[tx->tx_txg & TXG_MASK] = 0;
1664 }
1665
1666 dmu_objset_sync(ds->ds_objset, zio, tx);
1667
1668 for (f = 0; f < SPA_FEATURES; f++) {
1669 if (ds->ds_feature_activation_needed[f]) {
1670 if (ds->ds_feature_inuse[f])
1671 continue;
1672 dsl_dataset_activate_feature(ds->ds_object, f, tx);
1673 ds->ds_feature_inuse[f] = B_TRUE;
1674 }
1675 }
1676 }
1677
1678 static void
1679 get_clones_stat(dsl_dataset_t *ds, nvlist_t *nv)
1680 {
1681 uint64_t count = 0;
1682 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
1683 zap_cursor_t zc;
1684 zap_attribute_t za;
1685 nvlist_t *propval = fnvlist_alloc();
1686 nvlist_t *val = fnvlist_alloc();
1687
1688 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool));
1689
1690 /*
1691 * There may be missing entries in ds_next_clones_obj
1692 * due to a bug in a previous version of the code.
1693 * Only trust it if it has the right number of entries.
1694 */
1695 if (dsl_dataset_phys(ds)->ds_next_clones_obj != 0) {
1696 VERIFY0(zap_count(mos, dsl_dataset_phys(ds)->ds_next_clones_obj,
1697 &count));
1698 }
1699 if (count != dsl_dataset_phys(ds)->ds_num_children - 1)
1700 goto fail;
1701 for (zap_cursor_init(&zc, mos,
1702 dsl_dataset_phys(ds)->ds_next_clones_obj);
1703 zap_cursor_retrieve(&zc, &za) == 0;
1704 zap_cursor_advance(&zc)) {
1705 dsl_dataset_t *clone;
1706 char buf[ZFS_MAX_DATASET_NAME_LEN];
1707 VERIFY0(dsl_dataset_hold_obj(ds->ds_dir->dd_pool,
1708 za.za_first_integer, FTAG, &clone));
1709 dsl_dir_name(clone->ds_dir, buf);
1710 fnvlist_add_boolean(val, buf);
1711 dsl_dataset_rele(clone, FTAG);
1712 }
1713 zap_cursor_fini(&zc);
1714 fnvlist_add_nvlist(propval, ZPROP_VALUE, val);
1715 fnvlist_add_nvlist(nv, zfs_prop_to_name(ZFS_PROP_CLONES), propval);
1716 fail:
1717 nvlist_free(val);
1718 nvlist_free(propval);
1719 }
1720
1721 static void
1722 get_receive_resume_stats(dsl_dataset_t *ds, nvlist_t *nv)
1723 {
1724 dsl_pool_t *dp = ds->ds_dir->dd_pool;
1725
1726 if (dsl_dataset_has_resume_receive_state(ds)) {
1727 char *str;
1728 void *packed;
1729 uint8_t *compressed;
1730 uint64_t val;
1731 nvlist_t *token_nv = fnvlist_alloc();
1732 size_t packed_size, compressed_size;
1733 zio_cksum_t cksum;
1734 char *propval;
1735 char buf[MAXNAMELEN];
1736 int i;
1737
1738 if (zap_lookup(dp->dp_meta_objset, ds->ds_object,
1739 DS_FIELD_RESUME_FROMGUID, sizeof (val), 1, &val) == 0) {
1740 fnvlist_add_uint64(token_nv, "fromguid", val);
1741 }
1742 if (zap_lookup(dp->dp_meta_objset, ds->ds_object,
1743 DS_FIELD_RESUME_OBJECT, sizeof (val), 1, &val) == 0) {
1744 fnvlist_add_uint64(token_nv, "object", val);
1745 }
1746 if (zap_lookup(dp->dp_meta_objset, ds->ds_object,
1747 DS_FIELD_RESUME_OFFSET, sizeof (val), 1, &val) == 0) {
1748 fnvlist_add_uint64(token_nv, "offset", val);
1749 }
1750 if (zap_lookup(dp->dp_meta_objset, ds->ds_object,
1751 DS_FIELD_RESUME_BYTES, sizeof (val), 1, &val) == 0) {
1752 fnvlist_add_uint64(token_nv, "bytes", val);
1753 }
1754 if (zap_lookup(dp->dp_meta_objset, ds->ds_object,
1755 DS_FIELD_RESUME_TOGUID, sizeof (val), 1, &val) == 0) {
1756 fnvlist_add_uint64(token_nv, "toguid", val);
1757 }
1758 if (zap_lookup(dp->dp_meta_objset, ds->ds_object,
1759 DS_FIELD_RESUME_TONAME, 1, sizeof (buf), buf) == 0) {
1760 fnvlist_add_string(token_nv, "toname", buf);
1761 }
1762 if (zap_contains(dp->dp_meta_objset, ds->ds_object,
1763 DS_FIELD_RESUME_LARGEBLOCK) == 0) {
1764 fnvlist_add_boolean(token_nv, "largeblockok");
1765 }
1766 if (zap_contains(dp->dp_meta_objset, ds->ds_object,
1767 DS_FIELD_RESUME_EMBEDOK) == 0) {
1768 fnvlist_add_boolean(token_nv, "embedok");
1769 }
1770 if (zap_contains(dp->dp_meta_objset, ds->ds_object,
1771 DS_FIELD_RESUME_COMPRESSOK) == 0) {
1772 fnvlist_add_boolean(token_nv, "compressok");
1773 }
1774 packed = fnvlist_pack(token_nv, &packed_size);
1775 fnvlist_free(token_nv);
1776 compressed = kmem_alloc(packed_size, KM_SLEEP);
1777
1778 compressed_size = gzip_compress(packed, compressed,
1779 packed_size, packed_size, 6);
1780
1781 fletcher_4_native_varsize(compressed, compressed_size, &cksum);
1782
1783 str = kmem_alloc(compressed_size * 2 + 1, KM_SLEEP);
1784 for (i = 0; i < compressed_size; i++) {
1785 (void) sprintf(str + i * 2, "%02x", compressed[i]);
1786 }
1787 str[compressed_size * 2] = '\0';
1788 propval = kmem_asprintf("%u-%llx-%llx-%s",
1789 ZFS_SEND_RESUME_TOKEN_VERSION,
1790 (longlong_t)cksum.zc_word[0],
1791 (longlong_t)packed_size, str);
1792 dsl_prop_nvlist_add_string(nv,
1793 ZFS_PROP_RECEIVE_RESUME_TOKEN, propval);
1794 kmem_free(packed, packed_size);
1795 kmem_free(str, compressed_size * 2 + 1);
1796 kmem_free(compressed, packed_size);
1797 strfree(propval);
1798 }
1799 }
1800
1801 void
1802 dsl_dataset_stats(dsl_dataset_t *ds, nvlist_t *nv)
1803 {
1804 dsl_pool_t *dp = ds->ds_dir->dd_pool;
1805 uint64_t refd, avail, uobjs, aobjs, ratio;
1806
1807 ASSERT(dsl_pool_config_held(dp));
1808
1809 ratio = dsl_dataset_phys(ds)->ds_compressed_bytes == 0 ? 100 :
1810 (dsl_dataset_phys(ds)->ds_uncompressed_bytes * 100 /
1811 dsl_dataset_phys(ds)->ds_compressed_bytes);
1812
1813 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRATIO, ratio);
1814 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_LOGICALREFERENCED,
1815 dsl_dataset_phys(ds)->ds_uncompressed_bytes);
1816
1817 if (ds->ds_is_snapshot) {
1818 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_COMPRESSRATIO, ratio);
1819 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USED,
1820 dsl_dataset_phys(ds)->ds_unique_bytes);
1821 get_clones_stat(ds, nv);
1822 } else {
1823 if (ds->ds_prev != NULL && ds->ds_prev != dp->dp_origin_snap) {
1824 char buf[ZFS_MAX_DATASET_NAME_LEN];
1825 dsl_dataset_name(ds->ds_prev, buf);
1826 dsl_prop_nvlist_add_string(nv, ZFS_PROP_PREV_SNAP, buf);
1827 }
1828
1829 dsl_dir_stats(ds->ds_dir, nv);
1830 }
1831
1832 dsl_dataset_space(ds, &refd, &avail, &uobjs, &aobjs);
1833 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_AVAILABLE, avail);
1834 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFERENCED, refd);
1835
1836 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATION,
1837 dsl_dataset_phys(ds)->ds_creation_time);
1838 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATETXG,
1839 dsl_dataset_phys(ds)->ds_creation_txg);
1840 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFQUOTA,
1841 ds->ds_quota);
1842 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRESERVATION,
1843 ds->ds_reserved);
1844 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_GUID,
1845 dsl_dataset_phys(ds)->ds_guid);
1846 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_UNIQUE,
1847 dsl_dataset_phys(ds)->ds_unique_bytes);
1848 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_OBJSETID,
1849 ds->ds_object);
1850 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USERREFS,
1851 ds->ds_userrefs);
1852 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_DEFER_DESTROY,
1853 DS_IS_DEFER_DESTROY(ds) ? 1 : 0);
1854
1855 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) {
1856 uint64_t written, comp, uncomp;
1857 dsl_pool_t *dp = ds->ds_dir->dd_pool;
1858 dsl_dataset_t *prev;
1859 int err;
1860
1861 err = dsl_dataset_hold_obj(dp,
1862 dsl_dataset_phys(ds)->ds_prev_snap_obj, FTAG, &prev);
1863 if (err == 0) {
1864 err = dsl_dataset_space_written(prev, ds, &written,
1865 &comp, &uncomp);
1866 dsl_dataset_rele(prev, FTAG);
1867 if (err == 0) {
1868 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_WRITTEN,
1869 written);
1870 }
1871 }
1872 }
1873
1874 if (!dsl_dataset_is_snapshot(ds)) {
1875 /* 6 extra bytes for /%recv */
1876 char recvname[ZFS_MAX_DATASET_NAME_LEN + 6];
1877 dsl_dataset_t *recv_ds;
1878
1879 /*
1880 * A failed "newfs" (e.g. full) resumable receive leaves
1881 * the stats set on this dataset. Check here for the prop.
1882 */
1883 get_receive_resume_stats(ds, nv);
1884
1885 /*
1886 * A failed incremental resumable receive leaves the
1887 * stats set on our child named "%recv". Check the child
1888 * for the prop.
1889 */
1890 dsl_dataset_name(ds, recvname);
1891 if (strlcat(recvname, "/", sizeof (recvname)) <
1892 sizeof (recvname) &&
1893 strlcat(recvname, recv_clone_name, sizeof (recvname)) <
1894 sizeof (recvname) &&
1895 dsl_dataset_hold(dp, recvname, FTAG, &recv_ds) == 0) {
1896 get_receive_resume_stats(recv_ds, nv);
1897 dsl_dataset_rele(recv_ds, FTAG);
1898 }
1899 }
1900 }
1901
1902 void
1903 dsl_dataset_fast_stat(dsl_dataset_t *ds, dmu_objset_stats_t *stat)
1904 {
1905 dsl_pool_t *dp = ds->ds_dir->dd_pool;
1906 ASSERT(dsl_pool_config_held(dp));
1907
1908 stat->dds_creation_txg = dsl_dataset_phys(ds)->ds_creation_txg;
1909 stat->dds_inconsistent =
1910 dsl_dataset_phys(ds)->ds_flags & DS_FLAG_INCONSISTENT;
1911 stat->dds_guid = dsl_dataset_phys(ds)->ds_guid;
1912 stat->dds_origin[0] = '\0';
1913 if (ds->ds_is_snapshot) {
1914 stat->dds_is_snapshot = B_TRUE;
1915 stat->dds_num_clones =
1916 dsl_dataset_phys(ds)->ds_num_children - 1;
1917 } else {
1918 stat->dds_is_snapshot = B_FALSE;
1919 stat->dds_num_clones = 0;
1920
1921 if (dsl_dir_is_clone(ds->ds_dir)) {
1922 dsl_dataset_t *ods;
1923
1924 VERIFY0(dsl_dataset_hold_obj(dp,
1925 dsl_dir_phys(ds->ds_dir)->dd_origin_obj,
1926 FTAG, &ods));
1927 dsl_dataset_name(ods, stat->dds_origin);
1928 dsl_dataset_rele(ods, FTAG);
1929 }
1930 }
1931 }
1932
1933 uint64_t
1934 dsl_dataset_fsid_guid(dsl_dataset_t *ds)
1935 {
1936 return (ds->ds_fsid_guid);
1937 }
1938
1939 void
1940 dsl_dataset_space(dsl_dataset_t *ds,
1941 uint64_t *refdbytesp, uint64_t *availbytesp,
1942 uint64_t *usedobjsp, uint64_t *availobjsp)
1943 {
1944 *refdbytesp = dsl_dataset_phys(ds)->ds_referenced_bytes;
1945 *availbytesp = dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE);
1946 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes)
1947 *availbytesp +=
1948 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes;
1949 if (ds->ds_quota != 0) {
1950 /*
1951 * Adjust available bytes according to refquota
1952 */
1953 if (*refdbytesp < ds->ds_quota)
1954 *availbytesp = MIN(*availbytesp,
1955 ds->ds_quota - *refdbytesp);
1956 else
1957 *availbytesp = 0;
1958 }
1959 *usedobjsp = BP_GET_FILL(&dsl_dataset_phys(ds)->ds_bp);
1960 *availobjsp = DN_MAX_OBJECT - *usedobjsp;
1961 }
1962
1963 boolean_t
1964 dsl_dataset_modified_since_snap(dsl_dataset_t *ds, dsl_dataset_t *snap)
1965 {
1966 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool));
1967 if (snap == NULL)
1968 return (B_FALSE);
1969 if (dsl_dataset_phys(ds)->ds_bp.blk_birth >
1970 dsl_dataset_phys(snap)->ds_creation_txg) {
1971 objset_t *os, *os_snap;
1972 /*
1973 * It may be that only the ZIL differs, because it was
1974 * reset in the head. Don't count that as being
1975 * modified.
1976 */
1977 if (dmu_objset_from_ds(ds, &os) != 0)
1978 return (B_TRUE);
1979 if (dmu_objset_from_ds(snap, &os_snap) != 0)
1980 return (B_TRUE);
1981 return (bcmp(&os->os_phys->os_meta_dnode,
1982 &os_snap->os_phys->os_meta_dnode,
1983 sizeof (os->os_phys->os_meta_dnode)) != 0);
1984 }
1985 return (B_FALSE);
1986 }
1987
1988 typedef struct dsl_dataset_rename_snapshot_arg {
1989 const char *ddrsa_fsname;
1990 const char *ddrsa_oldsnapname;
1991 const char *ddrsa_newsnapname;
1992 boolean_t ddrsa_recursive;
1993 dmu_tx_t *ddrsa_tx;
1994 } dsl_dataset_rename_snapshot_arg_t;
1995
1996 /* ARGSUSED */
1997 static int
1998 dsl_dataset_rename_snapshot_check_impl(dsl_pool_t *dp,
1999 dsl_dataset_t *hds, void *arg)
2000 {
2001 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg;
2002 int error;
2003 uint64_t val;
2004
2005 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val);
2006 if (error != 0) {
2007 /* ignore nonexistent snapshots */
2008 return (error == ENOENT ? 0 : error);
2009 }
2010
2011 /* new name should not exist */
2012 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_newsnapname, &val);
2013 if (error == 0)
2014 error = SET_ERROR(EEXIST);
2015 else if (error == ENOENT)
2016 error = 0;
2017
2018 /* dataset name + 1 for the "@" + the new snapshot name must fit */
2019 if (dsl_dir_namelen(hds->ds_dir) + 1 +
2020 strlen(ddrsa->ddrsa_newsnapname) >= ZFS_MAX_DATASET_NAME_LEN)
2021 error = SET_ERROR(ENAMETOOLONG);
2022
2023 return (error);
2024 }
2025
2026 static int
2027 dsl_dataset_rename_snapshot_check(void *arg, dmu_tx_t *tx)
2028 {
2029 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg;
2030 dsl_pool_t *dp = dmu_tx_pool(tx);
2031 dsl_dataset_t *hds;
2032 int error;
2033
2034 error = dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds);
2035 if (error != 0)
2036 return (error);
2037
2038 if (ddrsa->ddrsa_recursive) {
2039 error = dmu_objset_find_dp(dp, hds->ds_dir->dd_object,
2040 dsl_dataset_rename_snapshot_check_impl, ddrsa,
2041 DS_FIND_CHILDREN);
2042 } else {
2043 error = dsl_dataset_rename_snapshot_check_impl(dp, hds, ddrsa);
2044 }
2045 dsl_dataset_rele(hds, FTAG);
2046 return (error);
2047 }
2048
2049 static int
2050 dsl_dataset_rename_snapshot_sync_impl(dsl_pool_t *dp,
2051 dsl_dataset_t *hds, void *arg)
2052 {
2053 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg;
2054 dsl_dataset_t *ds;
2055 uint64_t val;
2056 dmu_tx_t *tx = ddrsa->ddrsa_tx;
2057 int error;
2058
2059 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val);
2060 ASSERT(error == 0 || error == ENOENT);
2061 if (error == ENOENT) {
2062 /* ignore nonexistent snapshots */
2063 return (0);
2064 }
2065
2066 VERIFY0(dsl_dataset_hold_obj(dp, val, FTAG, &ds));
2067
2068 /* log before we change the name */
2069 spa_history_log_internal_ds(ds, "rename", tx,
2070 "-> @%s", ddrsa->ddrsa_newsnapname);
2071
2072 VERIFY0(dsl_dataset_snap_remove(hds, ddrsa->ddrsa_oldsnapname, tx,
2073 B_FALSE));
2074 mutex_enter(&ds->ds_lock);
2075 (void) strcpy(ds->ds_snapname, ddrsa->ddrsa_newsnapname);
2076 mutex_exit(&ds->ds_lock);
2077 VERIFY0(zap_add(dp->dp_meta_objset,
2078 dsl_dataset_phys(hds)->ds_snapnames_zapobj,
2079 ds->ds_snapname, 8, 1, &ds->ds_object, tx));
2080 zvol_rename_minors(dp->dp_spa, ddrsa->ddrsa_oldsnapname,
2081 ddrsa->ddrsa_newsnapname, B_TRUE);
2082
2083 dsl_dataset_rele(ds, FTAG);
2084 return (0);
2085 }
2086
2087 static void
2088 dsl_dataset_rename_snapshot_sync(void *arg, dmu_tx_t *tx)
2089 {
2090 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg;
2091 dsl_pool_t *dp = dmu_tx_pool(tx);
2092 dsl_dataset_t *hds = NULL;
2093
2094 VERIFY0(dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds));
2095 ddrsa->ddrsa_tx = tx;
2096 if (ddrsa->ddrsa_recursive) {
2097 VERIFY0(dmu_objset_find_dp(dp, hds->ds_dir->dd_object,
2098 dsl_dataset_rename_snapshot_sync_impl, ddrsa,
2099 DS_FIND_CHILDREN));
2100 } else {
2101 VERIFY0(dsl_dataset_rename_snapshot_sync_impl(dp, hds, ddrsa));
2102 }
2103 dsl_dataset_rele(hds, FTAG);
2104 }
2105
2106 int
2107 dsl_dataset_rename_snapshot(const char *fsname,
2108 const char *oldsnapname, const char *newsnapname, boolean_t recursive)
2109 {
2110 dsl_dataset_rename_snapshot_arg_t ddrsa;
2111
2112 ddrsa.ddrsa_fsname = fsname;
2113 ddrsa.ddrsa_oldsnapname = oldsnapname;
2114 ddrsa.ddrsa_newsnapname = newsnapname;
2115 ddrsa.ddrsa_recursive = recursive;
2116
2117 return (dsl_sync_task(fsname, dsl_dataset_rename_snapshot_check,
2118 dsl_dataset_rename_snapshot_sync, &ddrsa,
2119 1, ZFS_SPACE_CHECK_RESERVED));
2120 }
2121
2122 /*
2123 * If we're doing an ownership handoff, we need to make sure that there is
2124 * only one long hold on the dataset. We're not allowed to change anything here
2125 * so we don't permanently release the long hold or regular hold here. We want
2126 * to do this only when syncing to avoid the dataset unexpectedly going away
2127 * when we release the long hold. Allow a long hold to exist for volumes, this
2128 * may occur when asynchronously registering the minor with the kernel.
2129 */
2130 static int
2131 dsl_dataset_handoff_check(dsl_dataset_t *ds, void *owner, dmu_tx_t *tx)
2132 {
2133 boolean_t held;
2134
2135 if (!dmu_tx_is_syncing(tx))
2136 return (0);
2137
2138 if (owner != NULL) {
2139 VERIFY3P(ds->ds_owner, ==, owner);
2140 dsl_dataset_long_rele(ds, owner);
2141 }
2142
2143 held = (dsl_dataset_long_held(ds) && (ds->ds_owner != zvol_tag));
2144
2145 if (owner != NULL)
2146 dsl_dataset_long_hold(ds, owner);
2147
2148 if (held)
2149 return (SET_ERROR(EBUSY));
2150
2151 return (0);
2152 }
2153
2154 typedef struct dsl_dataset_rollback_arg {
2155 const char *ddra_fsname;
2156 void *ddra_owner;
2157 nvlist_t *ddra_result;
2158 } dsl_dataset_rollback_arg_t;
2159
2160 static int
2161 dsl_dataset_rollback_check(void *arg, dmu_tx_t *tx)
2162 {
2163 dsl_dataset_rollback_arg_t *ddra = arg;
2164 dsl_pool_t *dp = dmu_tx_pool(tx);
2165 dsl_dataset_t *ds;
2166 int64_t unused_refres_delta;
2167 int error;
2168 nvpair_t *pair;
2169 nvlist_t *proprequest, *bookmarks;
2170
2171 error = dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds);
2172 if (error != 0)
2173 return (error);
2174
2175 /* must not be a snapshot */
2176 if (ds->ds_is_snapshot) {
2177 dsl_dataset_rele(ds, FTAG);
2178 return (SET_ERROR(EINVAL));
2179 }
2180
2181 /* must have a most recent snapshot */
2182 if (dsl_dataset_phys(ds)->ds_prev_snap_txg < TXG_INITIAL) {
2183 dsl_dataset_rele(ds, FTAG);
2184 return (SET_ERROR(EINVAL));
2185 }
2186
2187 /* must not have any bookmarks after the most recent snapshot */
2188 proprequest = fnvlist_alloc();
2189 fnvlist_add_boolean(proprequest, zfs_prop_to_name(ZFS_PROP_CREATETXG));
2190 bookmarks = fnvlist_alloc();
2191 error = dsl_get_bookmarks_impl(ds, proprequest, bookmarks);
2192 fnvlist_free(proprequest);
2193 if (error != 0)
2194 return (error);
2195 for (pair = nvlist_next_nvpair(bookmarks, NULL);
2196 pair != NULL; pair = nvlist_next_nvpair(bookmarks, pair)) {
2197 nvlist_t *valuenv =
2198 fnvlist_lookup_nvlist(fnvpair_value_nvlist(pair),
2199 zfs_prop_to_name(ZFS_PROP_CREATETXG));
2200 uint64_t createtxg = fnvlist_lookup_uint64(valuenv, "value");
2201 if (createtxg > dsl_dataset_phys(ds)->ds_prev_snap_txg) {
2202 fnvlist_free(bookmarks);
2203 dsl_dataset_rele(ds, FTAG);
2204 return (SET_ERROR(EEXIST));
2205 }
2206 }
2207 fnvlist_free(bookmarks);
2208
2209 error = dsl_dataset_handoff_check(ds, ddra->ddra_owner, tx);
2210 if (error != 0) {
2211 dsl_dataset_rele(ds, FTAG);
2212 return (error);
2213 }
2214
2215 /*
2216 * Check if the snap we are rolling back to uses more than
2217 * the refquota.
2218 */
2219 if (ds->ds_quota != 0 &&
2220 dsl_dataset_phys(ds->ds_prev)->ds_referenced_bytes > ds->ds_quota) {
2221 dsl_dataset_rele(ds, FTAG);
2222 return (SET_ERROR(EDQUOT));
2223 }
2224
2225 /*
2226 * When we do the clone swap, we will temporarily use more space
2227 * due to the refreservation (the head will no longer have any
2228 * unique space, so the entire amount of the refreservation will need
2229 * to be free). We will immediately destroy the clone, freeing
2230 * this space, but the freeing happens over many txg's.
2231 */
2232 unused_refres_delta = (int64_t)MIN(ds->ds_reserved,
2233 dsl_dataset_phys(ds)->ds_unique_bytes);
2234
2235 if (unused_refres_delta > 0 &&
2236 unused_refres_delta >
2237 dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE)) {
2238 dsl_dataset_rele(ds, FTAG);
2239 return (SET_ERROR(ENOSPC));
2240 }
2241
2242 dsl_dataset_rele(ds, FTAG);
2243 return (0);
2244 }
2245
2246 static void
2247 dsl_dataset_rollback_sync(void *arg, dmu_tx_t *tx)
2248 {
2249 dsl_dataset_rollback_arg_t *ddra = arg;
2250 dsl_pool_t *dp = dmu_tx_pool(tx);
2251 dsl_dataset_t *ds, *clone;
2252 uint64_t cloneobj;
2253 char namebuf[ZFS_MAX_DATASET_NAME_LEN];
2254
2255 VERIFY0(dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds));
2256
2257 dsl_dataset_name(ds->ds_prev, namebuf);
2258 fnvlist_add_string(ddra->ddra_result, "target", namebuf);
2259
2260 cloneobj = dsl_dataset_create_sync(ds->ds_dir, "%rollback",
2261 ds->ds_prev, DS_CREATE_FLAG_NODIRTY, kcred, tx);
2262
2263 VERIFY0(dsl_dataset_hold_obj(dp, cloneobj, FTAG, &clone));
2264
2265 dsl_dataset_clone_swap_sync_impl(clone, ds, tx);
2266 dsl_dataset_zero_zil(ds, tx);
2267
2268 dsl_destroy_head_sync_impl(clone, tx);
2269
2270 dsl_dataset_rele(clone, FTAG);
2271 dsl_dataset_rele(ds, FTAG);
2272 }
2273
2274 /*
2275 * Rolls back the given filesystem or volume to the most recent snapshot.
2276 * The name of the most recent snapshot will be returned under key "target"
2277 * in the result nvlist.
2278 *
2279 * If owner != NULL:
2280 * - The existing dataset MUST be owned by the specified owner at entry
2281 * - Upon return, dataset will still be held by the same owner, whether we
2282 * succeed or not.
2283 *
2284 * This mode is required any time the existing filesystem is mounted. See
2285 * notes above zfs_suspend_fs() for further details.
2286 */
2287 int
2288 dsl_dataset_rollback(const char *fsname, void *owner, nvlist_t *result)
2289 {
2290 dsl_dataset_rollback_arg_t ddra;
2291
2292 ddra.ddra_fsname = fsname;
2293 ddra.ddra_owner = owner;
2294 ddra.ddra_result = result;
2295
2296 return (dsl_sync_task(fsname, dsl_dataset_rollback_check,
2297 dsl_dataset_rollback_sync, &ddra,
2298 1, ZFS_SPACE_CHECK_RESERVED));
2299 }
2300
2301 struct promotenode {
2302 list_node_t link;
2303 dsl_dataset_t *ds;
2304 };
2305
2306 typedef struct dsl_dataset_promote_arg {
2307 const char *ddpa_clonename;
2308 dsl_dataset_t *ddpa_clone;
2309 list_t shared_snaps, origin_snaps, clone_snaps;
2310 dsl_dataset_t *origin_origin; /* origin of the origin */
2311 uint64_t used, comp, uncomp, unique, cloneusedsnap, originusedsnap;
2312 char *err_ds;
2313 cred_t *cr;
2314 } dsl_dataset_promote_arg_t;
2315
2316 static int snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep);
2317 static int promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp,
2318 void *tag);
2319 static void promote_rele(dsl_dataset_promote_arg_t *ddpa, void *tag);
2320
2321 static int
2322 dsl_dataset_promote_check(void *arg, dmu_tx_t *tx)
2323 {
2324 dsl_dataset_promote_arg_t *ddpa = arg;
2325 dsl_pool_t *dp = dmu_tx_pool(tx);
2326 dsl_dataset_t *hds;
2327 struct promotenode *snap;
2328 dsl_dataset_t *origin_ds;
2329 int err;
2330 uint64_t unused;
2331 uint64_t ss_mv_cnt;
2332 size_t max_snap_len;
2333
2334 err = promote_hold(ddpa, dp, FTAG);
2335 if (err != 0)
2336 return (err);
2337
2338 hds = ddpa->ddpa_clone;
2339 max_snap_len = MAXNAMELEN - strlen(ddpa->ddpa_clonename) - 1;
2340
2341 if (dsl_dataset_phys(hds)->ds_flags & DS_FLAG_NOPROMOTE) {
2342 promote_rele(ddpa, FTAG);
2343 return (SET_ERROR(EXDEV));
2344 }
2345
2346 /*
2347 * Compute and check the amount of space to transfer. Since this is
2348 * so expensive, don't do the preliminary check.
2349 */
2350 if (!dmu_tx_is_syncing(tx)) {
2351 promote_rele(ddpa, FTAG);
2352 return (0);
2353 }
2354
2355 snap = list_head(&ddpa->shared_snaps);
2356 origin_ds = snap->ds;
2357
2358 /* compute origin's new unique space */
2359 snap = list_tail(&ddpa->clone_snaps);
2360 ASSERT3U(dsl_dataset_phys(snap->ds)->ds_prev_snap_obj, ==,
2361 origin_ds->ds_object);
2362 dsl_deadlist_space_range(&snap->ds->ds_deadlist,
2363 dsl_dataset_phys(origin_ds)->ds_prev_snap_txg, UINT64_MAX,
2364 &ddpa->unique, &unused, &unused);
2365
2366 /*
2367 * Walk the snapshots that we are moving
2368 *
2369 * Compute space to transfer. Consider the incremental changes
2370 * to used by each snapshot:
2371 * (my used) = (prev's used) + (blocks born) - (blocks killed)
2372 * So each snapshot gave birth to:
2373 * (blocks born) = (my used) - (prev's used) + (blocks killed)
2374 * So a sequence would look like:
2375 * (uN - u(N-1) + kN) + ... + (u1 - u0 + k1) + (u0 - 0 + k0)
2376 * Which simplifies to:
2377 * uN + kN + kN-1 + ... + k1 + k0
2378 * Note however, if we stop before we reach the ORIGIN we get:
2379 * uN + kN + kN-1 + ... + kM - uM-1
2380 */
2381 ss_mv_cnt = 0;
2382 ddpa->used = dsl_dataset_phys(origin_ds)->ds_referenced_bytes;
2383 ddpa->comp = dsl_dataset_phys(origin_ds)->ds_compressed_bytes;
2384 ddpa->uncomp = dsl_dataset_phys(origin_ds)->ds_uncompressed_bytes;
2385 for (snap = list_head(&ddpa->shared_snaps); snap;
2386 snap = list_next(&ddpa->shared_snaps, snap)) {
2387 uint64_t val, dlused, dlcomp, dluncomp;
2388 dsl_dataset_t *ds = snap->ds;
2389
2390 ss_mv_cnt++;
2391
2392 /*
2393 * If there are long holds, we won't be able to evict
2394 * the objset.
2395 */
2396 if (dsl_dataset_long_held(ds)) {
2397 err = SET_ERROR(EBUSY);
2398 goto out;
2399 }
2400
2401 /* Check that the snapshot name does not conflict */
2402 VERIFY0(dsl_dataset_get_snapname(ds));
2403 if (strlen(ds->ds_snapname) >= max_snap_len) {
2404 err = SET_ERROR(ENAMETOOLONG);
2405 goto out;
2406 }
2407 err = dsl_dataset_snap_lookup(hds, ds->ds_snapname, &val);
2408 if (err == 0) {
2409 (void) strcpy(ddpa->err_ds, snap->ds->ds_snapname);
2410 err = SET_ERROR(EEXIST);
2411 goto out;
2412 }
2413 if (err != ENOENT)
2414 goto out;
2415
2416 /* The very first snapshot does not have a deadlist */
2417 if (dsl_dataset_phys(ds)->ds_prev_snap_obj == 0)
2418 continue;
2419
2420 dsl_deadlist_space(&ds->ds_deadlist,
2421 &dlused, &dlcomp, &dluncomp);
2422 ddpa->used += dlused;
2423 ddpa->comp += dlcomp;
2424 ddpa->uncomp += dluncomp;
2425 }
2426
2427 /*
2428 * If we are a clone of a clone then we never reached ORIGIN,
2429 * so we need to subtract out the clone origin's used space.
2430 */
2431 if (ddpa->origin_origin) {
2432 ddpa->used -=
2433 dsl_dataset_phys(ddpa->origin_origin)->ds_referenced_bytes;
2434 ddpa->comp -=
2435 dsl_dataset_phys(ddpa->origin_origin)->ds_compressed_bytes;
2436 ddpa->uncomp -=
2437 dsl_dataset_phys(ddpa->origin_origin)->
2438 ds_uncompressed_bytes;
2439 }
2440
2441 /* Check that there is enough space and limit headroom here */
2442 err = dsl_dir_transfer_possible(origin_ds->ds_dir, hds->ds_dir,
2443 0, ss_mv_cnt, ddpa->used, ddpa->cr);
2444 if (err != 0)
2445 goto out;
2446
2447 /*
2448 * Compute the amounts of space that will be used by snapshots
2449 * after the promotion (for both origin and clone). For each,
2450 * it is the amount of space that will be on all of their
2451 * deadlists (that was not born before their new origin).
2452 */
2453 if (dsl_dir_phys(hds->ds_dir)->dd_flags & DD_FLAG_USED_BREAKDOWN) {
2454 uint64_t space;
2455
2456 /*
2457 * Note, typically this will not be a clone of a clone,
2458 * so dd_origin_txg will be < TXG_INITIAL, so
2459 * these snaplist_space() -> dsl_deadlist_space_range()
2460 * calls will be fast because they do not have to
2461 * iterate over all bps.
2462 */
2463 snap = list_head(&ddpa->origin_snaps);
2464 err = snaplist_space(&ddpa->shared_snaps,
2465 snap->ds->ds_dir->dd_origin_txg, &ddpa->cloneusedsnap);
2466 if (err != 0)
2467 goto out;
2468
2469 err = snaplist_space(&ddpa->clone_snaps,
2470 snap->ds->ds_dir->dd_origin_txg, &space);
2471 if (err != 0)
2472 goto out;
2473 ddpa->cloneusedsnap += space;
2474 }
2475 if (dsl_dir_phys(origin_ds->ds_dir)->dd_flags &
2476 DD_FLAG_USED_BREAKDOWN) {
2477 err = snaplist_space(&ddpa->origin_snaps,
2478 dsl_dataset_phys(origin_ds)->ds_creation_txg,
2479 &ddpa->originusedsnap);
2480 if (err != 0)
2481 goto out;
2482 }
2483
2484 out:
2485 promote_rele(ddpa, FTAG);
2486 return (err);
2487 }
2488
2489 static void
2490 dsl_dataset_promote_sync(void *arg, dmu_tx_t *tx)
2491 {
2492 dsl_dataset_promote_arg_t *ddpa = arg;
2493 dsl_pool_t *dp = dmu_tx_pool(tx);
2494 dsl_dataset_t *hds;
2495 struct promotenode *snap;
2496 dsl_dataset_t *origin_ds;
2497 dsl_dataset_t *origin_head;
2498 dsl_dir_t *dd;
2499 dsl_dir_t *odd = NULL;
2500 uint64_t oldnext_obj;
2501 int64_t delta;
2502
2503 VERIFY0(promote_hold(ddpa, dp, FTAG));
2504 hds = ddpa->ddpa_clone;
2505
2506 ASSERT0(dsl_dataset_phys(hds)->ds_flags & DS_FLAG_NOPROMOTE);
2507
2508 snap = list_head(&ddpa->shared_snaps);
2509 origin_ds = snap->ds;
2510 dd = hds->ds_dir;
2511
2512 snap = list_head(&ddpa->origin_snaps);
2513 origin_head = snap->ds;
2514
2515 /*
2516 * We need to explicitly open odd, since origin_ds's dd will be
2517 * changing.
2518 */
2519 VERIFY0(dsl_dir_hold_obj(dp, origin_ds->ds_dir->dd_object,
2520 NULL, FTAG, &odd));
2521
2522 /* change origin's next snap */
2523 dmu_buf_will_dirty(origin_ds->ds_dbuf, tx);
2524 oldnext_obj = dsl_dataset_phys(origin_ds)->ds_next_snap_obj;
2525 snap = list_tail(&ddpa->clone_snaps);
2526 ASSERT3U(dsl_dataset_phys(snap->ds)->ds_prev_snap_obj, ==,
2527 origin_ds->ds_object);
2528 dsl_dataset_phys(origin_ds)->ds_next_snap_obj = snap->ds->ds_object;
2529
2530 /* change the origin's next clone */
2531 if (dsl_dataset_phys(origin_ds)->ds_next_clones_obj) {
2532 dsl_dataset_remove_from_next_clones(origin_ds,
2533 snap->ds->ds_object, tx);
2534 VERIFY0(zap_add_int(dp->dp_meta_objset,
2535 dsl_dataset_phys(origin_ds)->ds_next_clones_obj,
2536 oldnext_obj, tx));
2537 }
2538
2539 /* change origin */
2540 dmu_buf_will_dirty(dd->dd_dbuf, tx);
2541 ASSERT3U(dsl_dir_phys(dd)->dd_origin_obj, ==, origin_ds->ds_object);
2542 dsl_dir_phys(dd)->dd_origin_obj = dsl_dir_phys(odd)->dd_origin_obj;
2543 dd->dd_origin_txg = origin_head->ds_dir->dd_origin_txg;
2544 dmu_buf_will_dirty(odd->dd_dbuf, tx);
2545 dsl_dir_phys(odd)->dd_origin_obj = origin_ds->ds_object;
2546 origin_head->ds_dir->dd_origin_txg =
2547 dsl_dataset_phys(origin_ds)->ds_creation_txg;
2548
2549 /* change dd_clone entries */
2550 if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) {
2551 VERIFY0(zap_remove_int(dp->dp_meta_objset,
2552 dsl_dir_phys(odd)->dd_clones, hds->ds_object, tx));
2553 VERIFY0(zap_add_int(dp->dp_meta_objset,
2554 dsl_dir_phys(ddpa->origin_origin->ds_dir)->dd_clones,
2555 hds->ds_object, tx));
2556
2557 VERIFY0(zap_remove_int(dp->dp_meta_objset,
2558 dsl_dir_phys(ddpa->origin_origin->ds_dir)->dd_clones,
2559 origin_head->ds_object, tx));
2560 if (dsl_dir_phys(dd)->dd_clones == 0) {
2561 dsl_dir_phys(dd)->dd_clones =
2562 zap_create(dp->dp_meta_objset, DMU_OT_DSL_CLONES,
2563 DMU_OT_NONE, 0, tx);
2564 }
2565 VERIFY0(zap_add_int(dp->dp_meta_objset,
2566 dsl_dir_phys(dd)->dd_clones, origin_head->ds_object, tx));
2567 }
2568
2569 /* move snapshots to this dir */
2570 for (snap = list_head(&ddpa->shared_snaps); snap;
2571 snap = list_next(&ddpa->shared_snaps, snap)) {
2572 dsl_dataset_t *ds = snap->ds;
2573
2574 /*
2575 * Property callbacks are registered to a particular
2576 * dsl_dir. Since ours is changing, evict the objset
2577 * so that they will be unregistered from the old dsl_dir.
2578 */
2579 if (ds->ds_objset) {
2580 dmu_objset_evict(ds->ds_objset);
2581 ds->ds_objset = NULL;
2582 }
2583
2584 /* move snap name entry */
2585 VERIFY0(dsl_dataset_get_snapname(ds));
2586 VERIFY0(dsl_dataset_snap_remove(origin_head,
2587 ds->ds_snapname, tx, B_TRUE));
2588 VERIFY0(zap_add(dp->dp_meta_objset,
2589 dsl_dataset_phys(hds)->ds_snapnames_zapobj, ds->ds_snapname,
2590 8, 1, &ds->ds_object, tx));
2591 dsl_fs_ss_count_adjust(hds->ds_dir, 1,
2592 DD_FIELD_SNAPSHOT_COUNT, tx);
2593
2594 /* change containing dsl_dir */
2595 dmu_buf_will_dirty(ds->ds_dbuf, tx);
2596 ASSERT3U(dsl_dataset_phys(ds)->ds_dir_obj, ==, odd->dd_object);
2597 dsl_dataset_phys(ds)->ds_dir_obj = dd->dd_object;
2598 ASSERT3P(ds->ds_dir, ==, odd);
2599 dsl_dir_rele(ds->ds_dir, ds);
2600 VERIFY0(dsl_dir_hold_obj(dp, dd->dd_object,
2601 NULL, ds, &ds->ds_dir));
2602
2603 /* move any clone references */
2604 if (dsl_dataset_phys(ds)->ds_next_clones_obj &&
2605 spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) {
2606 zap_cursor_t zc;
2607 zap_attribute_t za;
2608
2609 for (zap_cursor_init(&zc, dp->dp_meta_objset,
2610 dsl_dataset_phys(ds)->ds_next_clones_obj);
2611 zap_cursor_retrieve(&zc, &za) == 0;
2612 zap_cursor_advance(&zc)) {
2613 dsl_dataset_t *cnds;
2614 uint64_t o;
2615
2616 if (za.za_first_integer == oldnext_obj) {
2617 /*
2618 * We've already moved the
2619 * origin's reference.
2620 */
2621 continue;
2622 }
2623
2624 VERIFY0(dsl_dataset_hold_obj(dp,
2625 za.za_first_integer, FTAG, &cnds));
2626 o = dsl_dir_phys(cnds->ds_dir)->
2627 dd_head_dataset_obj;
2628
2629 VERIFY0(zap_remove_int(dp->dp_meta_objset,
2630 dsl_dir_phys(odd)->dd_clones, o, tx));
2631 VERIFY0(zap_add_int(dp->dp_meta_objset,
2632 dsl_dir_phys(dd)->dd_clones, o, tx));
2633 dsl_dataset_rele(cnds, FTAG);
2634 }
2635 zap_cursor_fini(&zc);
2636 }
2637
2638 ASSERT(!dsl_prop_hascb(ds));
2639 }
2640
2641 /*
2642 * Change space accounting.
2643 * Note, pa->*usedsnap and dd_used_breakdown[SNAP] will either
2644 * both be valid, or both be 0 (resulting in delta == 0). This
2645 * is true for each of {clone,origin} independently.
2646 */
2647
2648 delta = ddpa->cloneusedsnap -
2649 dsl_dir_phys(dd)->dd_used_breakdown[DD_USED_SNAP];
2650 ASSERT3S(delta, >=, 0);
2651 ASSERT3U(ddpa->used, >=, delta);
2652 dsl_dir_diduse_space(dd, DD_USED_SNAP, delta, 0, 0, tx);
2653 dsl_dir_diduse_space(dd, DD_USED_HEAD,
2654 ddpa->used - delta, ddpa->comp, ddpa->uncomp, tx);
2655
2656 delta = ddpa->originusedsnap -
2657 dsl_dir_phys(odd)->dd_used_breakdown[DD_USED_SNAP];
2658 ASSERT3S(delta, <=, 0);
2659 ASSERT3U(ddpa->used, >=, -delta);
2660 dsl_dir_diduse_space(odd, DD_USED_SNAP, delta, 0, 0, tx);
2661 dsl_dir_diduse_space(odd, DD_USED_HEAD,
2662 -ddpa->used - delta, -ddpa->comp, -ddpa->uncomp, tx);
2663
2664 dsl_dataset_phys(origin_ds)->ds_unique_bytes = ddpa->unique;
2665
2666 /* log history record */
2667 spa_history_log_internal_ds(hds, "promote", tx, "");
2668
2669 dsl_dir_rele(odd, FTAG);
2670 promote_rele(ddpa, FTAG);
2671 }
2672
2673 /*
2674 * Make a list of dsl_dataset_t's for the snapshots between first_obj
2675 * (exclusive) and last_obj (inclusive). The list will be in reverse
2676 * order (last_obj will be the list_head()). If first_obj == 0, do all
2677 * snapshots back to this dataset's origin.
2678 */
2679 static int
2680 snaplist_make(dsl_pool_t *dp,
2681 uint64_t first_obj, uint64_t last_obj, list_t *l, void *tag)
2682 {
2683 uint64_t obj = last_obj;
2684
2685 list_create(l, sizeof (struct promotenode),
2686 offsetof(struct promotenode, link));
2687
2688 while (obj != first_obj) {
2689 dsl_dataset_t *ds;
2690 struct promotenode *snap;
2691 int err;
2692
2693 err = dsl_dataset_hold_obj(dp, obj, tag, &ds);
2694 ASSERT(err != ENOENT);
2695 if (err != 0)
2696 return (err);
2697
2698 if (first_obj == 0)
2699 first_obj = dsl_dir_phys(ds->ds_dir)->dd_origin_obj;
2700
2701 snap = kmem_alloc(sizeof (*snap), KM_SLEEP);
2702 snap->ds = ds;
2703 list_insert_tail(l, snap);
2704 obj = dsl_dataset_phys(ds)->ds_prev_snap_obj;
2705 }
2706
2707 return (0);
2708 }
2709
2710 static int
2711 snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep)
2712 {
2713 struct promotenode *snap;
2714
2715 *spacep = 0;
2716 for (snap = list_head(l); snap; snap = list_next(l, snap)) {
2717 uint64_t used, comp, uncomp;
2718 dsl_deadlist_space_range(&snap->ds->ds_deadlist,
2719 mintxg, UINT64_MAX, &used, &comp, &uncomp);
2720 *spacep += used;
2721 }
2722 return (0);
2723 }
2724
2725 static void
2726 snaplist_destroy(list_t *l, void *tag)
2727 {
2728 struct promotenode *snap;
2729
2730 if (l == NULL || !list_link_active(&l->list_head))
2731 return;
2732
2733 while ((snap = list_tail(l)) != NULL) {
2734 list_remove(l, snap);
2735 dsl_dataset_rele(snap->ds, tag);
2736 kmem_free(snap, sizeof (*snap));
2737 }
2738 list_destroy(l);
2739 }
2740
2741 static int
2742 promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp, void *tag)
2743 {
2744 int error;
2745 dsl_dir_t *dd;
2746 struct promotenode *snap;
2747
2748 error = dsl_dataset_hold(dp, ddpa->ddpa_clonename, tag,
2749 &ddpa->ddpa_clone);
2750 if (error != 0)
2751 return (error);
2752 dd = ddpa->ddpa_clone->ds_dir;
2753
2754 if (ddpa->ddpa_clone->ds_is_snapshot ||
2755 !dsl_dir_is_clone(dd)) {
2756 dsl_dataset_rele(ddpa->ddpa_clone, tag);
2757 return (SET_ERROR(EINVAL));
2758 }
2759
2760 error = snaplist_make(dp, 0, dsl_dir_phys(dd)->dd_origin_obj,
2761 &ddpa->shared_snaps, tag);
2762 if (error != 0)
2763 goto out;
2764
2765 error = snaplist_make(dp, 0, ddpa->ddpa_clone->ds_object,
2766 &ddpa->clone_snaps, tag);
2767 if (error != 0)
2768 goto out;
2769
2770 snap = list_head(&ddpa->shared_snaps);
2771 ASSERT3U(snap->ds->ds_object, ==, dsl_dir_phys(dd)->dd_origin_obj);
2772 error = snaplist_make(dp, dsl_dir_phys(dd)->dd_origin_obj,
2773 dsl_dir_phys(snap->ds->ds_dir)->dd_head_dataset_obj,
2774 &ddpa->origin_snaps, tag);
2775 if (error != 0)
2776 goto out;
2777
2778 if (dsl_dir_phys(snap->ds->ds_dir)->dd_origin_obj != 0) {
2779 error = dsl_dataset_hold_obj(dp,
2780 dsl_dir_phys(snap->ds->ds_dir)->dd_origin_obj,
2781 tag, &ddpa->origin_origin);
2782 if (error != 0)
2783 goto out;
2784 }
2785 out:
2786 if (error != 0)
2787 promote_rele(ddpa, tag);
2788 return (error);
2789 }
2790
2791 static void
2792 promote_rele(dsl_dataset_promote_arg_t *ddpa, void *tag)
2793 {
2794 snaplist_destroy(&ddpa->shared_snaps, tag);
2795 snaplist_destroy(&ddpa->clone_snaps, tag);
2796 snaplist_destroy(&ddpa->origin_snaps, tag);
2797 if (ddpa->origin_origin != NULL)
2798 dsl_dataset_rele(ddpa->origin_origin, tag);
2799 dsl_dataset_rele(ddpa->ddpa_clone, tag);
2800 }
2801
2802 /*
2803 * Promote a clone.
2804 *
2805 * If it fails due to a conflicting snapshot name, "conflsnap" will be filled
2806 * in with the name. (It must be at least ZFS_MAX_DATASET_NAME_LEN bytes long.)
2807 */
2808 int
2809 dsl_dataset_promote(const char *name, char *conflsnap)
2810 {
2811 dsl_dataset_promote_arg_t ddpa = { 0 };
2812 uint64_t numsnaps;
2813 int error;
2814 objset_t *os;
2815
2816 /*
2817 * We will modify space proportional to the number of
2818 * snapshots. Compute numsnaps.
2819 */
2820 error = dmu_objset_hold(name, FTAG, &os);
2821 if (error != 0)
2822 return (error);
2823 error = zap_count(dmu_objset_pool(os)->dp_meta_objset,
2824 dsl_dataset_phys(dmu_objset_ds(os))->ds_snapnames_zapobj,
2825 &numsnaps);
2826 dmu_objset_rele(os, FTAG);
2827 if (error != 0)
2828 return (error);
2829
2830 ddpa.ddpa_clonename = name;
2831 ddpa.err_ds = conflsnap;
2832 ddpa.cr = CRED();
2833
2834 return (dsl_sync_task(name, dsl_dataset_promote_check,
2835 dsl_dataset_promote_sync, &ddpa,
2836 2 + numsnaps, ZFS_SPACE_CHECK_RESERVED));
2837 }
2838
2839 int
2840 dsl_dataset_clone_swap_check_impl(dsl_dataset_t *clone,
2841 dsl_dataset_t *origin_head, boolean_t force, void *owner, dmu_tx_t *tx)
2842 {
2843 /*
2844 * "slack" factor for received datasets with refquota set on them.
2845 * See the bottom of this function for details on its use.
2846 */
2847 uint64_t refquota_slack = (uint64_t)DMU_MAX_ACCESS *
2848 spa_asize_inflation;
2849 int64_t unused_refres_delta;
2850
2851 /* they should both be heads */
2852 if (clone->ds_is_snapshot ||
2853 origin_head->ds_is_snapshot)
2854 return (SET_ERROR(EINVAL));
2855
2856 /* if we are not forcing, the branch point should be just before them */
2857 if (!force && clone->ds_prev != origin_head->ds_prev)
2858 return (SET_ERROR(EINVAL));
2859
2860 /* clone should be the clone (unless they are unrelated) */
2861 if (clone->ds_prev != NULL &&
2862 clone->ds_prev != clone->ds_dir->dd_pool->dp_origin_snap &&
2863 origin_head->ds_dir != clone->ds_prev->ds_dir)
2864 return (SET_ERROR(EINVAL));
2865
2866 /* the clone should be a child of the origin */
2867 if (clone->ds_dir->dd_parent != origin_head->ds_dir)
2868 return (SET_ERROR(EINVAL));
2869
2870 /* origin_head shouldn't be modified unless 'force' */
2871 if (!force &&
2872 dsl_dataset_modified_since_snap(origin_head, origin_head->ds_prev))
2873 return (SET_ERROR(ETXTBSY));
2874
2875 /* origin_head should have no long holds (e.g. is not mounted) */
2876 if (dsl_dataset_handoff_check(origin_head, owner, tx))
2877 return (SET_ERROR(EBUSY));
2878
2879 /* check amount of any unconsumed refreservation */
2880 unused_refres_delta =
2881 (int64_t)MIN(origin_head->ds_reserved,
2882 dsl_dataset_phys(origin_head)->ds_unique_bytes) -
2883 (int64_t)MIN(origin_head->ds_reserved,
2884 dsl_dataset_phys(clone)->ds_unique_bytes);
2885
2886 if (unused_refres_delta > 0 &&
2887 unused_refres_delta >
2888 dsl_dir_space_available(origin_head->ds_dir, NULL, 0, TRUE))
2889 return (SET_ERROR(ENOSPC));
2890
2891 /*
2892 * The clone can't be too much over the head's refquota.
2893 *
2894 * To ensure that the entire refquota can be used, we allow one
2895 * transaction to exceed the the refquota. Therefore, this check
2896 * needs to also allow for the space referenced to be more than the
2897 * refquota. The maximum amount of space that one transaction can use
2898 * on disk is DMU_MAX_ACCESS * spa_asize_inflation. Allowing this
2899 * overage ensures that we are able to receive a filesystem that
2900 * exceeds the refquota on the source system.
2901 *
2902 * So that overage is the refquota_slack we use below.
2903 */
2904 if (origin_head->ds_quota != 0 &&
2905 dsl_dataset_phys(clone)->ds_referenced_bytes >
2906 origin_head->ds_quota + refquota_slack)
2907 return (SET_ERROR(EDQUOT));
2908
2909 return (0);
2910 }
2911
2912 void
2913 dsl_dataset_clone_swap_sync_impl(dsl_dataset_t *clone,
2914 dsl_dataset_t *origin_head, dmu_tx_t *tx)
2915 {
2916 spa_feature_t f;
2917 dsl_pool_t *dp = dmu_tx_pool(tx);
2918 int64_t unused_refres_delta;
2919
2920 ASSERT(clone->ds_reserved == 0);
2921 /*
2922 * NOTE: On DEBUG kernels there could be a race between this and
2923 * the check function if spa_asize_inflation is adjusted...
2924 */
2925 ASSERT(origin_head->ds_quota == 0 ||
2926 dsl_dataset_phys(clone)->ds_unique_bytes <= origin_head->ds_quota +
2927 DMU_MAX_ACCESS * spa_asize_inflation);
2928 ASSERT3P(clone->ds_prev, ==, origin_head->ds_prev);
2929
2930 /*
2931 * Swap per-dataset feature flags.
2932 */
2933 for (f = 0; f < SPA_FEATURES; f++) {
2934 boolean_t clone_inuse;
2935 boolean_t origin_head_inuse;
2936
2937 if (!(spa_feature_table[f].fi_flags &
2938 ZFEATURE_FLAG_PER_DATASET)) {
2939 ASSERT(!clone->ds_feature_inuse[f]);
2940 ASSERT(!origin_head->ds_feature_inuse[f]);
2941 continue;
2942 }
2943
2944 clone_inuse = clone->ds_feature_inuse[f];
2945 origin_head_inuse = origin_head->ds_feature_inuse[f];
2946
2947 if (clone_inuse) {
2948 dsl_dataset_deactivate_feature(clone->ds_object, f, tx);
2949 clone->ds_feature_inuse[f] = B_FALSE;
2950 }
2951 if (origin_head_inuse) {
2952 dsl_dataset_deactivate_feature(origin_head->ds_object,
2953 f, tx);
2954 origin_head->ds_feature_inuse[f] = B_FALSE;
2955 }
2956 if (clone_inuse) {
2957 dsl_dataset_activate_feature(origin_head->ds_object,
2958 f, tx);
2959 origin_head->ds_feature_inuse[f] = B_TRUE;
2960 }
2961 if (origin_head_inuse) {
2962 dsl_dataset_activate_feature(clone->ds_object, f, tx);
2963 clone->ds_feature_inuse[f] = B_TRUE;
2964 }
2965 }
2966
2967 dmu_buf_will_dirty(clone->ds_dbuf, tx);
2968 dmu_buf_will_dirty(origin_head->ds_dbuf, tx);
2969
2970 if (clone->ds_objset != NULL) {
2971 dmu_objset_evict(clone->ds_objset);
2972 clone->ds_objset = NULL;
2973 }
2974
2975 if (origin_head->ds_objset != NULL) {
2976 dmu_objset_evict(origin_head->ds_objset);
2977 origin_head->ds_objset = NULL;
2978 }
2979
2980 unused_refres_delta =
2981 (int64_t)MIN(origin_head->ds_reserved,
2982 dsl_dataset_phys(origin_head)->ds_unique_bytes) -
2983 (int64_t)MIN(origin_head->ds_reserved,
2984 dsl_dataset_phys(clone)->ds_unique_bytes);
2985
2986 /*
2987 * Reset origin's unique bytes, if it exists.
2988 */
2989 if (clone->ds_prev) {
2990 dsl_dataset_t *origin = clone->ds_prev;
2991 uint64_t comp, uncomp;
2992
2993 dmu_buf_will_dirty(origin->ds_dbuf, tx);
2994 dsl_deadlist_space_range(&clone->ds_deadlist,
2995 dsl_dataset_phys(origin)->ds_prev_snap_txg, UINT64_MAX,
2996 &dsl_dataset_phys(origin)->ds_unique_bytes, &comp, &uncomp);
2997 }
2998
2999 /* swap blkptrs */
3000 {
3001 blkptr_t tmp;
3002 tmp = dsl_dataset_phys(origin_head)->ds_bp;
3003 dsl_dataset_phys(origin_head)->ds_bp =
3004 dsl_dataset_phys(clone)->ds_bp;
3005 dsl_dataset_phys(clone)->ds_bp = tmp;
3006 }
3007
3008 /* set dd_*_bytes */
3009 {
3010 int64_t dused, dcomp, duncomp;
3011 uint64_t cdl_used, cdl_comp, cdl_uncomp;
3012 uint64_t odl_used, odl_comp, odl_uncomp;
3013
3014 ASSERT3U(dsl_dir_phys(clone->ds_dir)->
3015 dd_used_breakdown[DD_USED_SNAP], ==, 0);
3016
3017 dsl_deadlist_space(&clone->ds_deadlist,
3018 &cdl_used, &cdl_comp, &cdl_uncomp);
3019 dsl_deadlist_space(&origin_head->ds_deadlist,
3020 &odl_used, &odl_comp, &odl_uncomp);
3021
3022 dused = dsl_dataset_phys(clone)->ds_referenced_bytes +
3023 cdl_used -
3024 (dsl_dataset_phys(origin_head)->ds_referenced_bytes +
3025 odl_used);
3026 dcomp = dsl_dataset_phys(clone)->ds_compressed_bytes +
3027 cdl_comp -
3028 (dsl_dataset_phys(origin_head)->ds_compressed_bytes +
3029 odl_comp);
3030 duncomp = dsl_dataset_phys(clone)->ds_uncompressed_bytes +
3031 cdl_uncomp -
3032 (dsl_dataset_phys(origin_head)->ds_uncompressed_bytes +
3033 odl_uncomp);
3034
3035 dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_HEAD,
3036 dused, dcomp, duncomp, tx);
3037 dsl_dir_diduse_space(clone->ds_dir, DD_USED_HEAD,
3038 -dused, -dcomp, -duncomp, tx);
3039
3040 /*
3041 * The difference in the space used by snapshots is the
3042 * difference in snapshot space due to the head's
3043 * deadlist (since that's the only thing that's
3044 * changing that affects the snapused).
3045 */
3046 dsl_deadlist_space_range(&clone->ds_deadlist,
3047 origin_head->ds_dir->dd_origin_txg, UINT64_MAX,
3048 &cdl_used, &cdl_comp, &cdl_uncomp);
3049 dsl_deadlist_space_range(&origin_head->ds_deadlist,
3050 origin_head->ds_dir->dd_origin_txg, UINT64_MAX,
3051 &odl_used, &odl_comp, &odl_uncomp);
3052 dsl_dir_transfer_space(origin_head->ds_dir, cdl_used - odl_used,
3053 DD_USED_HEAD, DD_USED_SNAP, tx);
3054 }
3055
3056 /* swap ds_*_bytes */
3057 SWITCH64(dsl_dataset_phys(origin_head)->ds_referenced_bytes,
3058 dsl_dataset_phys(clone)->ds_referenced_bytes);
3059 SWITCH64(dsl_dataset_phys(origin_head)->ds_compressed_bytes,
3060 dsl_dataset_phys(clone)->ds_compressed_bytes);
3061 SWITCH64(dsl_dataset_phys(origin_head)->ds_uncompressed_bytes,
3062 dsl_dataset_phys(clone)->ds_uncompressed_bytes);
3063 SWITCH64(dsl_dataset_phys(origin_head)->ds_unique_bytes,
3064 dsl_dataset_phys(clone)->ds_unique_bytes);
3065
3066 /* apply any parent delta for change in unconsumed refreservation */
3067 dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_REFRSRV,
3068 unused_refres_delta, 0, 0, tx);
3069
3070 /*
3071 * Swap deadlists.
3072 */
3073 dsl_deadlist_close(&clone->ds_deadlist);
3074 dsl_deadlist_close(&origin_head->ds_deadlist);
3075 SWITCH64(dsl_dataset_phys(origin_head)->ds_deadlist_obj,
3076 dsl_dataset_phys(clone)->ds_deadlist_obj);
3077 dsl_deadlist_open(&clone->ds_deadlist, dp->dp_meta_objset,
3078 dsl_dataset_phys(clone)->ds_deadlist_obj);
3079 dsl_deadlist_open(&origin_head->ds_deadlist, dp->dp_meta_objset,
3080 dsl_dataset_phys(origin_head)->ds_deadlist_obj);
3081
3082 dsl_scan_ds_clone_swapped(origin_head, clone, tx);
3083
3084 spa_history_log_internal_ds(clone, "clone swap", tx,
3085 "parent=%s", origin_head->ds_dir->dd_myname);
3086 }
3087
3088 /*
3089 * Given a pool name and a dataset object number in that pool,
3090 * return the name of that dataset.
3091 */
3092 int
3093 dsl_dsobj_to_dsname(char *pname, uint64_t obj, char *buf)
3094 {
3095 dsl_pool_t *dp;
3096 dsl_dataset_t *ds;
3097 int error;
3098
3099 error = dsl_pool_hold(pname, FTAG, &dp);
3100 if (error != 0)
3101 return (error);
3102
3103 error = dsl_dataset_hold_obj(dp, obj, FTAG, &ds);
3104 if (error == 0) {
3105 dsl_dataset_name(ds, buf);
3106 dsl_dataset_rele(ds, FTAG);
3107 }
3108 dsl_pool_rele(dp, FTAG);
3109
3110 return (error);
3111 }
3112
3113 int
3114 dsl_dataset_check_quota(dsl_dataset_t *ds, boolean_t check_quota,
3115 uint64_t asize, uint64_t inflight, uint64_t *used, uint64_t *ref_rsrv)
3116 {
3117 int error = 0;
3118
3119 ASSERT3S(asize, >, 0);
3120
3121 /*
3122 * *ref_rsrv is the portion of asize that will come from any
3123 * unconsumed refreservation space.
3124 */
3125 *ref_rsrv = 0;
3126
3127 mutex_enter(&ds->ds_lock);
3128 /*
3129 * Make a space adjustment for reserved bytes.
3130 */
3131 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes) {
3132 ASSERT3U(*used, >=,
3133 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes);
3134 *used -=
3135 (ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes);
3136 *ref_rsrv =
3137 asize - MIN(asize, parent_delta(ds, asize + inflight));
3138 }
3139
3140 if (!check_quota || ds->ds_quota == 0) {
3141 mutex_exit(&ds->ds_lock);
3142 return (0);
3143 }
3144 /*
3145 * If they are requesting more space, and our current estimate
3146 * is over quota, they get to try again unless the actual
3147 * on-disk is over quota and there are no pending changes (which
3148 * may free up space for us).
3149 */
3150 if (dsl_dataset_phys(ds)->ds_referenced_bytes + inflight >=
3151 ds->ds_quota) {
3152 if (inflight > 0 ||
3153 dsl_dataset_phys(ds)->ds_referenced_bytes < ds->ds_quota)
3154 error = SET_ERROR(ERESTART);
3155 else
3156 error = SET_ERROR(EDQUOT);
3157 }
3158 mutex_exit(&ds->ds_lock);
3159
3160 return (error);
3161 }
3162
3163 typedef struct dsl_dataset_set_qr_arg {
3164 const char *ddsqra_name;
3165 zprop_source_t ddsqra_source;
3166 uint64_t ddsqra_value;
3167 } dsl_dataset_set_qr_arg_t;
3168
3169
3170 /* ARGSUSED */
3171 static int
3172 dsl_dataset_set_refquota_check(void *arg, dmu_tx_t *tx)
3173 {
3174 dsl_dataset_set_qr_arg_t *ddsqra = arg;
3175 dsl_pool_t *dp = dmu_tx_pool(tx);
3176 dsl_dataset_t *ds;
3177 int error;
3178 uint64_t newval;
3179
3180 if (spa_version(dp->dp_spa) < SPA_VERSION_REFQUOTA)
3181 return (SET_ERROR(ENOTSUP));
3182
3183 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds);
3184 if (error != 0)
3185 return (error);
3186
3187 if (ds->ds_is_snapshot) {
3188 dsl_dataset_rele(ds, FTAG);
3189 return (SET_ERROR(EINVAL));
3190 }
3191
3192 error = dsl_prop_predict(ds->ds_dir,
3193 zfs_prop_to_name(ZFS_PROP_REFQUOTA),
3194 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval);
3195 if (error != 0) {
3196 dsl_dataset_rele(ds, FTAG);
3197 return (error);
3198 }
3199
3200 if (newval == 0) {
3201 dsl_dataset_rele(ds, FTAG);
3202 return (0);
3203 }
3204
3205 if (newval < dsl_dataset_phys(ds)->ds_referenced_bytes ||
3206 newval < ds->ds_reserved) {
3207 dsl_dataset_rele(ds, FTAG);
3208 return (SET_ERROR(ENOSPC));
3209 }
3210
3211 dsl_dataset_rele(ds, FTAG);
3212 return (0);
3213 }
3214
3215 static void
3216 dsl_dataset_set_refquota_sync(void *arg, dmu_tx_t *tx)
3217 {
3218 dsl_dataset_set_qr_arg_t *ddsqra = arg;
3219 dsl_pool_t *dp = dmu_tx_pool(tx);
3220 dsl_dataset_t *ds = NULL;
3221 uint64_t newval;
3222
3223 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds));
3224
3225 dsl_prop_set_sync_impl(ds,
3226 zfs_prop_to_name(ZFS_PROP_REFQUOTA),
3227 ddsqra->ddsqra_source, sizeof (ddsqra->ddsqra_value), 1,
3228 &ddsqra->ddsqra_value, tx);
3229
3230 VERIFY0(dsl_prop_get_int_ds(ds,
3231 zfs_prop_to_name(ZFS_PROP_REFQUOTA), &newval));
3232
3233 if (ds->ds_quota != newval) {
3234 dmu_buf_will_dirty(ds->ds_dbuf, tx);
3235 ds->ds_quota = newval;
3236 }
3237 dsl_dataset_rele(ds, FTAG);
3238 }
3239
3240 int
3241 dsl_dataset_set_refquota(const char *dsname, zprop_source_t source,
3242 uint64_t refquota)
3243 {
3244 dsl_dataset_set_qr_arg_t ddsqra;
3245
3246 ddsqra.ddsqra_name = dsname;
3247 ddsqra.ddsqra_source = source;
3248 ddsqra.ddsqra_value = refquota;
3249
3250 return (dsl_sync_task(dsname, dsl_dataset_set_refquota_check,
3251 dsl_dataset_set_refquota_sync, &ddsqra, 0, ZFS_SPACE_CHECK_NONE));
3252 }
3253
3254 static int
3255 dsl_dataset_set_refreservation_check(void *arg, dmu_tx_t *tx)
3256 {
3257 dsl_dataset_set_qr_arg_t *ddsqra = arg;
3258 dsl_pool_t *dp = dmu_tx_pool(tx);
3259 dsl_dataset_t *ds;
3260 int error;
3261 uint64_t newval, unique;
3262
3263 if (spa_version(dp->dp_spa) < SPA_VERSION_REFRESERVATION)
3264 return (SET_ERROR(ENOTSUP));
3265
3266 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds);
3267 if (error != 0)
3268 return (error);
3269
3270 if (ds->ds_is_snapshot) {
3271 dsl_dataset_rele(ds, FTAG);
3272 return (SET_ERROR(EINVAL));
3273 }
3274
3275 error = dsl_prop_predict(ds->ds_dir,
3276 zfs_prop_to_name(ZFS_PROP_REFRESERVATION),
3277 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval);
3278 if (error != 0) {
3279 dsl_dataset_rele(ds, FTAG);
3280 return (error);
3281 }
3282
3283 /*
3284 * If we are doing the preliminary check in open context, the
3285 * space estimates may be inaccurate.
3286 */
3287 if (!dmu_tx_is_syncing(tx)) {
3288 dsl_dataset_rele(ds, FTAG);
3289 return (0);
3290 }
3291
3292 mutex_enter(&ds->ds_lock);
3293 if (!DS_UNIQUE_IS_ACCURATE(ds))
3294 dsl_dataset_recalc_head_uniq(ds);
3295 unique = dsl_dataset_phys(ds)->ds_unique_bytes;
3296 mutex_exit(&ds->ds_lock);
3297
3298 if (MAX(unique, newval) > MAX(unique, ds->ds_reserved)) {
3299 uint64_t delta = MAX(unique, newval) -
3300 MAX(unique, ds->ds_reserved);
3301
3302 if (delta >
3303 dsl_dir_space_available(ds->ds_dir, NULL, 0, B_TRUE) ||
3304 (ds->ds_quota > 0 && newval > ds->ds_quota)) {
3305 dsl_dataset_rele(ds, FTAG);
3306 return (SET_ERROR(ENOSPC));
3307 }
3308 }
3309
3310 dsl_dataset_rele(ds, FTAG);
3311 return (0);
3312 }
3313
3314 void
3315 dsl_dataset_set_refreservation_sync_impl(dsl_dataset_t *ds,
3316 zprop_source_t source, uint64_t value, dmu_tx_t *tx)
3317 {
3318 uint64_t newval;
3319 uint64_t unique;
3320 int64_t delta;
3321
3322 dsl_prop_set_sync_impl(ds, zfs_prop_to_name(ZFS_PROP_REFRESERVATION),
3323 source, sizeof (value), 1, &value, tx);
3324
3325 VERIFY0(dsl_prop_get_int_ds(ds,
3326 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), &newval));
3327
3328 dmu_buf_will_dirty(ds->ds_dbuf, tx);
3329 mutex_enter(&ds->ds_dir->dd_lock);
3330 mutex_enter(&ds->ds_lock);
3331 ASSERT(DS_UNIQUE_IS_ACCURATE(ds));
3332 unique = dsl_dataset_phys(ds)->ds_unique_bytes;
3333 delta = MAX(0, (int64_t)(newval - unique)) -
3334 MAX(0, (int64_t)(ds->ds_reserved - unique));
3335 ds->ds_reserved = newval;
3336 mutex_exit(&ds->ds_lock);
3337
3338 dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV, delta, 0, 0, tx);
3339 mutex_exit(&ds->ds_dir->dd_lock);
3340 }
3341
3342 static void
3343 dsl_dataset_set_refreservation_sync(void *arg, dmu_tx_t *tx)
3344 {
3345 dsl_dataset_set_qr_arg_t *ddsqra = arg;
3346 dsl_pool_t *dp = dmu_tx_pool(tx);
3347 dsl_dataset_t *ds = NULL;
3348
3349 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds));
3350 dsl_dataset_set_refreservation_sync_impl(ds,
3351 ddsqra->ddsqra_source, ddsqra->ddsqra_value, tx);
3352 dsl_dataset_rele(ds, FTAG);
3353 }
3354
3355 int
3356 dsl_dataset_set_refreservation(const char *dsname, zprop_source_t source,
3357 uint64_t refreservation)
3358 {
3359 dsl_dataset_set_qr_arg_t ddsqra;
3360
3361 ddsqra.ddsqra_name = dsname;
3362 ddsqra.ddsqra_source = source;
3363 ddsqra.ddsqra_value = refreservation;
3364
3365 return (dsl_sync_task(dsname, dsl_dataset_set_refreservation_check,
3366 dsl_dataset_set_refreservation_sync, &ddsqra,
3367 0, ZFS_SPACE_CHECK_NONE));
3368 }
3369
3370 /*
3371 * Return (in *usedp) the amount of space written in new that is not
3372 * present in oldsnap. New may be a snapshot or the head. Old must be
3373 * a snapshot before new, in new's filesystem (or its origin). If not then
3374 * fail and return EINVAL.
3375 *
3376 * The written space is calculated by considering two components: First, we
3377 * ignore any freed space, and calculate the written as new's used space
3378 * minus old's used space. Next, we add in the amount of space that was freed
3379 * between the two snapshots, thus reducing new's used space relative to old's.
3380 * Specifically, this is the space that was born before old->ds_creation_txg,
3381 * and freed before new (ie. on new's deadlist or a previous deadlist).
3382 *
3383 * space freed [---------------------]
3384 * snapshots ---O-------O--------O-------O------
3385 * oldsnap new
3386 */
3387 int
3388 dsl_dataset_space_written(dsl_dataset_t *oldsnap, dsl_dataset_t *new,
3389 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp)
3390 {
3391 int err = 0;
3392 uint64_t snapobj;
3393 dsl_pool_t *dp = new->ds_dir->dd_pool;
3394
3395 ASSERT(dsl_pool_config_held(dp));
3396
3397 *usedp = 0;
3398 *usedp += dsl_dataset_phys(new)->ds_referenced_bytes;
3399 *usedp -= dsl_dataset_phys(oldsnap)->ds_referenced_bytes;
3400
3401 *compp = 0;
3402 *compp += dsl_dataset_phys(new)->ds_compressed_bytes;
3403 *compp -= dsl_dataset_phys(oldsnap)->ds_compressed_bytes;
3404
3405 *uncompp = 0;
3406 *uncompp += dsl_dataset_phys(new)->ds_uncompressed_bytes;
3407 *uncompp -= dsl_dataset_phys(oldsnap)->ds_uncompressed_bytes;
3408
3409 snapobj = new->ds_object;
3410 while (snapobj != oldsnap->ds_object) {
3411 dsl_dataset_t *snap;
3412 uint64_t used, comp, uncomp;
3413
3414 if (snapobj == new->ds_object) {
3415 snap = new;
3416 } else {
3417 err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &snap);
3418 if (err != 0)
3419 break;
3420 }
3421
3422 if (dsl_dataset_phys(snap)->ds_prev_snap_txg ==
3423 dsl_dataset_phys(oldsnap)->ds_creation_txg) {
3424 /*
3425 * The blocks in the deadlist can not be born after
3426 * ds_prev_snap_txg, so get the whole deadlist space,
3427 * which is more efficient (especially for old-format
3428 * deadlists). Unfortunately the deadlist code
3429 * doesn't have enough information to make this
3430 * optimization itself.
3431 */
3432 dsl_deadlist_space(&snap->ds_deadlist,
3433 &used, &comp, &uncomp);
3434 } else {
3435 dsl_deadlist_space_range(&snap->ds_deadlist,
3436 0, dsl_dataset_phys(oldsnap)->ds_creation_txg,
3437 &used, &comp, &uncomp);
3438 }
3439 *usedp += used;
3440 *compp += comp;
3441 *uncompp += uncomp;
3442
3443 /*
3444 * If we get to the beginning of the chain of snapshots
3445 * (ds_prev_snap_obj == 0) before oldsnap, then oldsnap
3446 * was not a snapshot of/before new.
3447 */
3448 snapobj = dsl_dataset_phys(snap)->ds_prev_snap_obj;
3449 if (snap != new)
3450 dsl_dataset_rele(snap, FTAG);
3451 if (snapobj == 0) {
3452 err = SET_ERROR(EINVAL);
3453 break;
3454 }
3455
3456 }
3457 return (err);
3458 }
3459
3460 /*
3461 * Return (in *usedp) the amount of space that will be reclaimed if firstsnap,
3462 * lastsnap, and all snapshots in between are deleted.
3463 *
3464 * blocks that would be freed [---------------------------]
3465 * snapshots ---O-------O--------O-------O--------O
3466 * firstsnap lastsnap
3467 *
3468 * This is the set of blocks that were born after the snap before firstsnap,
3469 * (birth > firstsnap->prev_snap_txg) and died before the snap after the
3470 * last snap (ie, is on lastsnap->ds_next->ds_deadlist or an earlier deadlist).
3471 * We calculate this by iterating over the relevant deadlists (from the snap
3472 * after lastsnap, backward to the snap after firstsnap), summing up the
3473 * space on the deadlist that was born after the snap before firstsnap.
3474 */
3475 int
3476 dsl_dataset_space_wouldfree(dsl_dataset_t *firstsnap,
3477 dsl_dataset_t *lastsnap,
3478 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp)
3479 {
3480 int err = 0;
3481 uint64_t snapobj;
3482 dsl_pool_t *dp = firstsnap->ds_dir->dd_pool;
3483
3484 ASSERT(firstsnap->ds_is_snapshot);
3485 ASSERT(lastsnap->ds_is_snapshot);
3486
3487 /*
3488 * Check that the snapshots are in the same dsl_dir, and firstsnap
3489 * is before lastsnap.
3490 */
3491 if (firstsnap->ds_dir != lastsnap->ds_dir ||
3492 dsl_dataset_phys(firstsnap)->ds_creation_txg >
3493 dsl_dataset_phys(lastsnap)->ds_creation_txg)
3494 return (SET_ERROR(EINVAL));
3495
3496 *usedp = *compp = *uncompp = 0;
3497
3498 snapobj = dsl_dataset_phys(lastsnap)->ds_next_snap_obj;
3499 while (snapobj != firstsnap->ds_object) {
3500 dsl_dataset_t *ds;
3501 uint64_t used, comp, uncomp;
3502
3503 err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &ds);
3504 if (err != 0)
3505 break;
3506
3507 dsl_deadlist_space_range(&ds->ds_deadlist,
3508 dsl_dataset_phys(firstsnap)->ds_prev_snap_txg, UINT64_MAX,
3509 &used, &comp, &uncomp);
3510 *usedp += used;
3511 *compp += comp;
3512 *uncompp += uncomp;
3513
3514 snapobj = dsl_dataset_phys(ds)->ds_prev_snap_obj;
3515 ASSERT3U(snapobj, !=, 0);
3516 dsl_dataset_rele(ds, FTAG);
3517 }
3518 return (err);
3519 }
3520
3521 /*
3522 * Return TRUE if 'earlier' is an earlier snapshot in 'later's timeline.
3523 * For example, they could both be snapshots of the same filesystem, and
3524 * 'earlier' is before 'later'. Or 'earlier' could be the origin of
3525 * 'later's filesystem. Or 'earlier' could be an older snapshot in the origin's
3526 * filesystem. Or 'earlier' could be the origin's origin.
3527 *
3528 * If non-zero, earlier_txg is used instead of earlier's ds_creation_txg.
3529 */
3530 boolean_t
3531 dsl_dataset_is_before(dsl_dataset_t *later, dsl_dataset_t *earlier,
3532 uint64_t earlier_txg)
3533 {
3534 dsl_pool_t *dp = later->ds_dir->dd_pool;
3535 int error;
3536 boolean_t ret;
3537 dsl_dataset_t *origin;
3538
3539 ASSERT(dsl_pool_config_held(dp));
3540 ASSERT(earlier->ds_is_snapshot || earlier_txg != 0);
3541
3542 if (earlier_txg == 0)
3543 earlier_txg = dsl_dataset_phys(earlier)->ds_creation_txg;
3544
3545 if (later->ds_is_snapshot &&
3546 earlier_txg >= dsl_dataset_phys(later)->ds_creation_txg)
3547 return (B_FALSE);
3548
3549 if (later->ds_dir == earlier->ds_dir)
3550 return (B_TRUE);
3551 if (!dsl_dir_is_clone(later->ds_dir))
3552 return (B_FALSE);
3553
3554 if (dsl_dir_phys(later->ds_dir)->dd_origin_obj == earlier->ds_object)
3555 return (B_TRUE);
3556 error = dsl_dataset_hold_obj(dp,
3557 dsl_dir_phys(later->ds_dir)->dd_origin_obj, FTAG, &origin);
3558 if (error != 0)
3559 return (B_FALSE);
3560 ret = dsl_dataset_is_before(origin, earlier, earlier_txg);
3561 dsl_dataset_rele(origin, FTAG);
3562 return (ret);
3563 }
3564
3565 void
3566 dsl_dataset_zapify(dsl_dataset_t *ds, dmu_tx_t *tx)
3567 {
3568 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
3569 dmu_object_zapify(mos, ds->ds_object, DMU_OT_DSL_DATASET, tx);
3570 }
3571
3572 boolean_t
3573 dsl_dataset_is_zapified(dsl_dataset_t *ds)
3574 {
3575 dmu_object_info_t doi;
3576
3577 dmu_object_info_from_db(ds->ds_dbuf, &doi);
3578 return (doi.doi_type == DMU_OTN_ZAP_METADATA);
3579 }
3580
3581 boolean_t
3582 dsl_dataset_has_resume_receive_state(dsl_dataset_t *ds)
3583 {
3584 return (dsl_dataset_is_zapified(ds) &&
3585 zap_contains(ds->ds_dir->dd_pool->dp_meta_objset,
3586 ds->ds_object, DS_FIELD_RESUME_TOGUID) == 0);
3587 }
3588
3589 #if defined(_KERNEL) && defined(HAVE_SPL)
3590 #if defined(_LP64)
3591 module_param(zfs_max_recordsize, int, 0644);
3592 MODULE_PARM_DESC(zfs_max_recordsize, "Max allowed record size");
3593 #else
3594 /* Limited to 1M on 32-bit platforms due to lack of virtual address space */
3595 module_param(zfs_max_recordsize, int, 0444);
3596 MODULE_PARM_DESC(zfs_max_recordsize, "Max allowed record size");
3597 #endif
3598
3599 EXPORT_SYMBOL(dsl_dataset_hold);
3600 EXPORT_SYMBOL(dsl_dataset_hold_obj);
3601 EXPORT_SYMBOL(dsl_dataset_own);
3602 EXPORT_SYMBOL(dsl_dataset_own_obj);
3603 EXPORT_SYMBOL(dsl_dataset_name);
3604 EXPORT_SYMBOL(dsl_dataset_rele);
3605 EXPORT_SYMBOL(dsl_dataset_disown);
3606 EXPORT_SYMBOL(dsl_dataset_tryown);
3607 EXPORT_SYMBOL(dsl_dataset_create_sync);
3608 EXPORT_SYMBOL(dsl_dataset_create_sync_dd);
3609 EXPORT_SYMBOL(dsl_dataset_snapshot_check);
3610 EXPORT_SYMBOL(dsl_dataset_snapshot_sync);
3611 EXPORT_SYMBOL(dsl_dataset_promote);
3612 EXPORT_SYMBOL(dsl_dataset_user_hold);
3613 EXPORT_SYMBOL(dsl_dataset_user_release);
3614 EXPORT_SYMBOL(dsl_dataset_get_holds);
3615 EXPORT_SYMBOL(dsl_dataset_get_blkptr);
3616 EXPORT_SYMBOL(dsl_dataset_set_blkptr);
3617 EXPORT_SYMBOL(dsl_dataset_get_spa);
3618 EXPORT_SYMBOL(dsl_dataset_modified_since_snap);
3619 EXPORT_SYMBOL(dsl_dataset_space_written);
3620 EXPORT_SYMBOL(dsl_dataset_space_wouldfree);
3621 EXPORT_SYMBOL(dsl_dataset_sync);
3622 EXPORT_SYMBOL(dsl_dataset_block_born);
3623 EXPORT_SYMBOL(dsl_dataset_block_kill);
3624 EXPORT_SYMBOL(dsl_dataset_block_freeable);
3625 EXPORT_SYMBOL(dsl_dataset_prev_snap_txg);
3626 EXPORT_SYMBOL(dsl_dataset_dirty);
3627 EXPORT_SYMBOL(dsl_dataset_stats);
3628 EXPORT_SYMBOL(dsl_dataset_fast_stat);
3629 EXPORT_SYMBOL(dsl_dataset_space);
3630 EXPORT_SYMBOL(dsl_dataset_fsid_guid);
3631 EXPORT_SYMBOL(dsl_dsobj_to_dsname);
3632 EXPORT_SYMBOL(dsl_dataset_check_quota);
3633 EXPORT_SYMBOL(dsl_dataset_clone_swap_check_impl);
3634 EXPORT_SYMBOL(dsl_dataset_clone_swap_sync_impl);
3635 #endif
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