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7235 remove unused func dsl_dataset_set_blkptr
[unleashed.git] / usr / src / uts / common / fs / zfs / dsl_dataset.c
blob8eef496083374773c33129564fb55b83f4ad05b4
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) 2014 Integros [integros.com]
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/dmu_send.h>
56 #include <sys/zio_checksum.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 = bp_get_dsize_sync(tx->tx_pool->dp_spa, bp);
110 int compressed = BP_GET_PSIZE(bp);
111 int uncompressed = BP_GET_UCSIZE(bp);
112 int64_t delta;
113
114 dprintf_bp(bp, "ds=%p", ds);
115
116 ASSERT(dmu_tx_is_syncing(tx));
117 /* It could have been compressed away to nothing */
118 if (BP_IS_HOLE(bp))
119 return;
120 ASSERT(BP_GET_TYPE(bp) != DMU_OT_NONE);
121 ASSERT(DMU_OT_IS_VALID(BP_GET_TYPE(bp)));
122 if (ds == NULL) {
123 dsl_pool_mos_diduse_space(tx->tx_pool,
124 used, compressed, uncompressed);
125 return;
126 }
127
128 dmu_buf_will_dirty(ds->ds_dbuf, tx);
129 mutex_enter(&ds->ds_lock);
130 delta = parent_delta(ds, used);
131 dsl_dataset_phys(ds)->ds_referenced_bytes += used;
132 dsl_dataset_phys(ds)->ds_compressed_bytes += compressed;
133 dsl_dataset_phys(ds)->ds_uncompressed_bytes += uncompressed;
134 dsl_dataset_phys(ds)->ds_unique_bytes += used;
135
136 if (BP_GET_LSIZE(bp) > SPA_OLD_MAXBLOCKSIZE) {
137 ds->ds_feature_activation_needed[SPA_FEATURE_LARGE_BLOCKS] =
138 B_TRUE;
139 }
140
141 spa_feature_t f = zio_checksum_to_feature(BP_GET_CHECKSUM(bp));
142 if (f != SPA_FEATURE_NONE)
143 ds->ds_feature_activation_needed[f] = B_TRUE;
144
145 mutex_exit(&ds->ds_lock);
146 dsl_dir_diduse_space(ds->ds_dir, DD_USED_HEAD, delta,
147 compressed, uncompressed, tx);
148 dsl_dir_transfer_space(ds->ds_dir, used - delta,
149 DD_USED_REFRSRV, DD_USED_HEAD, tx);
150 }
151
152 int
153 dsl_dataset_block_kill(dsl_dataset_t *ds, const blkptr_t *bp, dmu_tx_t *tx,
154 boolean_t async)
155 {
156 int used = bp_get_dsize_sync(tx->tx_pool->dp_spa, bp);
157 int compressed = BP_GET_PSIZE(bp);
158 int uncompressed = BP_GET_UCSIZE(bp);
159
160 if (BP_IS_HOLE(bp))
161 return (0);
162
163 ASSERT(dmu_tx_is_syncing(tx));
164 ASSERT(bp->blk_birth <= tx->tx_txg);
165
166 if (ds == NULL) {
167 dsl_free(tx->tx_pool, tx->tx_txg, bp);
168 dsl_pool_mos_diduse_space(tx->tx_pool,
169 -used, -compressed, -uncompressed);
170 return (used);
171 }
172 ASSERT3P(tx->tx_pool, ==, ds->ds_dir->dd_pool);
173
174 ASSERT(!ds->ds_is_snapshot);
175 dmu_buf_will_dirty(ds->ds_dbuf, tx);
176
177 if (bp->blk_birth > dsl_dataset_phys(ds)->ds_prev_snap_txg) {
178 int64_t delta;
179
180 dprintf_bp(bp, "freeing ds=%llu", ds->ds_object);
181 dsl_free(tx->tx_pool, tx->tx_txg, bp);
182
183 mutex_enter(&ds->ds_lock);
184 ASSERT(dsl_dataset_phys(ds)->ds_unique_bytes >= used ||
185 !DS_UNIQUE_IS_ACCURATE(ds));
186 delta = parent_delta(ds, -used);
187 dsl_dataset_phys(ds)->ds_unique_bytes -= used;
188 mutex_exit(&ds->ds_lock);
189 dsl_dir_diduse_space(ds->ds_dir, DD_USED_HEAD,
190 delta, -compressed, -uncompressed, tx);
191 dsl_dir_transfer_space(ds->ds_dir, -used - delta,
192 DD_USED_REFRSRV, DD_USED_HEAD, tx);
193 } else {
194 dprintf_bp(bp, "putting on dead list: %s", "");
195 if (async) {
196 /*
197 * We are here as part of zio's write done callback,
198 * which means we're a zio interrupt thread. We can't
199 * call dsl_deadlist_insert() now because it may block
200 * waiting for I/O. Instead, put bp on the deferred
201 * queue and let dsl_pool_sync() finish the job.
202 */
203 bplist_append(&ds->ds_pending_deadlist, bp);
204 } else {
205 dsl_deadlist_insert(&ds->ds_deadlist, bp, tx);
206 }
207 ASSERT3U(ds->ds_prev->ds_object, ==,
208 dsl_dataset_phys(ds)->ds_prev_snap_obj);
209 ASSERT(dsl_dataset_phys(ds->ds_prev)->ds_num_children > 0);
210 /* if (bp->blk_birth > prev prev snap txg) prev unique += bs */
211 if (dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj ==
212 ds->ds_object && bp->blk_birth >
213 dsl_dataset_phys(ds->ds_prev)->ds_prev_snap_txg) {
214 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx);
215 mutex_enter(&ds->ds_prev->ds_lock);
216 dsl_dataset_phys(ds->ds_prev)->ds_unique_bytes += used;
217 mutex_exit(&ds->ds_prev->ds_lock);
218 }
219 if (bp->blk_birth > ds->ds_dir->dd_origin_txg) {
220 dsl_dir_transfer_space(ds->ds_dir, used,
221 DD_USED_HEAD, DD_USED_SNAP, tx);
222 }
223 }
224 mutex_enter(&ds->ds_lock);
225 ASSERT3U(dsl_dataset_phys(ds)->ds_referenced_bytes, >=, used);
226 dsl_dataset_phys(ds)->ds_referenced_bytes -= used;
227 ASSERT3U(dsl_dataset_phys(ds)->ds_compressed_bytes, >=, compressed);
228 dsl_dataset_phys(ds)->ds_compressed_bytes -= compressed;
229 ASSERT3U(dsl_dataset_phys(ds)->ds_uncompressed_bytes, >=, uncompressed);
230 dsl_dataset_phys(ds)->ds_uncompressed_bytes -= uncompressed;
231 mutex_exit(&ds->ds_lock);
232
233 return (used);
234 }
235
236 uint64_t
237 dsl_dataset_prev_snap_txg(dsl_dataset_t *ds)
238 {
239 uint64_t trysnap = 0;
240
241 if (ds == NULL)
242 return (0);
243 /*
244 * The snapshot creation could fail, but that would cause an
245 * incorrect FALSE return, which would only result in an
246 * overestimation of the amount of space that an operation would
247 * consume, which is OK.
248 *
249 * There's also a small window where we could miss a pending
250 * snapshot, because we could set the sync task in the quiescing
251 * phase. So this should only be used as a guess.
252 */
253 if (ds->ds_trysnap_txg >
254 spa_last_synced_txg(ds->ds_dir->dd_pool->dp_spa))
255 trysnap = ds->ds_trysnap_txg;
256 return (MAX(dsl_dataset_phys(ds)->ds_prev_snap_txg, trysnap));
257 }
258
259 boolean_t
260 dsl_dataset_block_freeable(dsl_dataset_t *ds, const blkptr_t *bp,
261 uint64_t blk_birth)
262 {
263 if (blk_birth <= dsl_dataset_prev_snap_txg(ds) ||
264 (bp != NULL && BP_IS_HOLE(bp)))
265 return (B_FALSE);
266
267 ddt_prefetch(dsl_dataset_get_spa(ds), bp);
268
269 return (B_TRUE);
270 }
271
272 static void
273 dsl_dataset_evict(void *dbu)
274 {
275 dsl_dataset_t *ds = dbu;
276
277 ASSERT(ds->ds_owner == NULL);
278
279 ds->ds_dbuf = NULL;
280
281 unique_remove(ds->ds_fsid_guid);
282
283 if (ds->ds_objset != NULL)
284 dmu_objset_evict(ds->ds_objset);
285
286 if (ds->ds_prev) {
287 dsl_dataset_rele(ds->ds_prev, ds);
288 ds->ds_prev = NULL;
289 }
290
291 bplist_destroy(&ds->ds_pending_deadlist);
292 if (ds->ds_deadlist.dl_os != NULL)
293 dsl_deadlist_close(&ds->ds_deadlist);
294 if (ds->ds_dir)
295 dsl_dir_async_rele(ds->ds_dir, ds);
296
297 ASSERT(!list_link_active(&ds->ds_synced_link));
298
299 list_destroy(&ds->ds_prop_cbs);
300 mutex_destroy(&ds->ds_lock);
301 mutex_destroy(&ds->ds_opening_lock);
302 mutex_destroy(&ds->ds_sendstream_lock);
303 refcount_destroy(&ds->ds_longholds);
304
305 kmem_free(ds, sizeof (dsl_dataset_t));
306 }
307
308 int
309 dsl_dataset_get_snapname(dsl_dataset_t *ds)
310 {
311 dsl_dataset_phys_t *headphys;
312 int err;
313 dmu_buf_t *headdbuf;
314 dsl_pool_t *dp = ds->ds_dir->dd_pool;
315 objset_t *mos = dp->dp_meta_objset;
316
317 if (ds->ds_snapname[0])
318 return (0);
319 if (dsl_dataset_phys(ds)->ds_next_snap_obj == 0)
320 return (0);
321
322 err = dmu_bonus_hold(mos, dsl_dir_phys(ds->ds_dir)->dd_head_dataset_obj,
323 FTAG, &headdbuf);
324 if (err != 0)
325 return (err);
326 headphys = headdbuf->db_data;
327 err = zap_value_search(dp->dp_meta_objset,
328 headphys->ds_snapnames_zapobj, ds->ds_object, 0, ds->ds_snapname);
329 dmu_buf_rele(headdbuf, FTAG);
330 return (err);
331 }
332
333 int
334 dsl_dataset_snap_lookup(dsl_dataset_t *ds, const char *name, uint64_t *value)
335 {
336 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
337 uint64_t snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj;
338 matchtype_t mt;
339 int err;
340
341 if (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_CI_DATASET)
342 mt = MT_FIRST;
343 else
344 mt = MT_EXACT;
345
346 err = zap_lookup_norm(mos, snapobj, name, 8, 1,
347 value, mt, NULL, 0, NULL);
348 if (err == ENOTSUP && mt == MT_FIRST)
349 err = zap_lookup(mos, snapobj, name, 8, 1, value);
350 return (err);
351 }
352
353 int
354 dsl_dataset_snap_remove(dsl_dataset_t *ds, const char *name, dmu_tx_t *tx,
355 boolean_t adj_cnt)
356 {
357 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
358 uint64_t snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj;
359 matchtype_t mt;
360 int err;
361
362 dsl_dir_snap_cmtime_update(ds->ds_dir);
363
364 if (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_CI_DATASET)
365 mt = MT_FIRST;
366 else
367 mt = MT_EXACT;
368
369 err = zap_remove_norm(mos, snapobj, name, mt, tx);
370 if (err == ENOTSUP && mt == MT_FIRST)
371 err = zap_remove(mos, snapobj, name, tx);
372
373 if (err == 0 && adj_cnt)
374 dsl_fs_ss_count_adjust(ds->ds_dir, -1,
375 DD_FIELD_SNAPSHOT_COUNT, tx);
376
377 return (err);
378 }
379
380 boolean_t
381 dsl_dataset_try_add_ref(dsl_pool_t *dp, dsl_dataset_t *ds, void *tag)
382 {
383 dmu_buf_t *dbuf = ds->ds_dbuf;
384 boolean_t result = B_FALSE;
385
386 if (dbuf != NULL && dmu_buf_try_add_ref(dbuf, dp->dp_meta_objset,
387 ds->ds_object, DMU_BONUS_BLKID, tag)) {
388
389 if (ds == dmu_buf_get_user(dbuf))
390 result = B_TRUE;
391 else
392 dmu_buf_rele(dbuf, tag);
393 }
394
395 return (result);
396 }
397
398 int
399 dsl_dataset_hold_obj(dsl_pool_t *dp, uint64_t dsobj, void *tag,
400 dsl_dataset_t **dsp)
401 {
402 objset_t *mos = dp->dp_meta_objset;
403 dmu_buf_t *dbuf;
404 dsl_dataset_t *ds;
405 int err;
406 dmu_object_info_t doi;
407
408 ASSERT(dsl_pool_config_held(dp));
409
410 err = dmu_bonus_hold(mos, dsobj, tag, &dbuf);
411 if (err != 0)
412 return (err);
413
414 /* Make sure dsobj has the correct object type. */
415 dmu_object_info_from_db(dbuf, &doi);
416 if (doi.doi_bonus_type != DMU_OT_DSL_DATASET) {
417 dmu_buf_rele(dbuf, tag);
418 return (SET_ERROR(EINVAL));
419 }
420
421 ds = dmu_buf_get_user(dbuf);
422 if (ds == NULL) {
423 dsl_dataset_t *winner = NULL;
424
425 ds = kmem_zalloc(sizeof (dsl_dataset_t), KM_SLEEP);
426 ds->ds_dbuf = dbuf;
427 ds->ds_object = dsobj;
428 ds->ds_is_snapshot = dsl_dataset_phys(ds)->ds_num_children != 0;
429
430 mutex_init(&ds->ds_lock, NULL, MUTEX_DEFAULT, NULL);
431 mutex_init(&ds->ds_opening_lock, NULL, MUTEX_DEFAULT, NULL);
432 mutex_init(&ds->ds_sendstream_lock, NULL, MUTEX_DEFAULT, NULL);
433 refcount_create(&ds->ds_longholds);
434
435 bplist_create(&ds->ds_pending_deadlist);
436 dsl_deadlist_open(&ds->ds_deadlist,
437 mos, dsl_dataset_phys(ds)->ds_deadlist_obj);
438
439 list_create(&ds->ds_sendstreams, sizeof (dmu_sendarg_t),
440 offsetof(dmu_sendarg_t, dsa_link));
441
442 list_create(&ds->ds_prop_cbs, sizeof (dsl_prop_cb_record_t),
443 offsetof(dsl_prop_cb_record_t, cbr_ds_node));
444
445 if (doi.doi_type == DMU_OTN_ZAP_METADATA) {
446 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) {
447 if (!(spa_feature_table[f].fi_flags &
448 ZFEATURE_FLAG_PER_DATASET))
449 continue;
450 err = zap_contains(mos, dsobj,
451 spa_feature_table[f].fi_guid);
452 if (err == 0) {
453 ds->ds_feature_inuse[f] = B_TRUE;
454 } else {
455 ASSERT3U(err, ==, ENOENT);
456 err = 0;
457 }
458 }
459 }
460
461 err = dsl_dir_hold_obj(dp,
462 dsl_dataset_phys(ds)->ds_dir_obj, NULL, ds, &ds->ds_dir);
463 if (err != 0) {
464 mutex_destroy(&ds->ds_lock);
465 mutex_destroy(&ds->ds_opening_lock);
466 mutex_destroy(&ds->ds_sendstream_lock);
467 refcount_destroy(&ds->ds_longholds);
468 bplist_destroy(&ds->ds_pending_deadlist);
469 dsl_deadlist_close(&ds->ds_deadlist);
470 kmem_free(ds, sizeof (dsl_dataset_t));
471 dmu_buf_rele(dbuf, tag);
472 return (err);
473 }
474
475 if (!ds->ds_is_snapshot) {
476 ds->ds_snapname[0] = '\0';
477 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) {
478 err = dsl_dataset_hold_obj(dp,
479 dsl_dataset_phys(ds)->ds_prev_snap_obj,
480 ds, &ds->ds_prev);
481 }
482 if (doi.doi_type == DMU_OTN_ZAP_METADATA) {
483 int zaperr = zap_lookup(mos, ds->ds_object,
484 DS_FIELD_BOOKMARK_NAMES,
485 sizeof (ds->ds_bookmarks), 1,
486 &ds->ds_bookmarks);
487 if (zaperr != ENOENT)
488 VERIFY0(zaperr);
489 }
490 } else {
491 if (zfs_flags & ZFS_DEBUG_SNAPNAMES)
492 err = dsl_dataset_get_snapname(ds);
493 if (err == 0 &&
494 dsl_dataset_phys(ds)->ds_userrefs_obj != 0) {
495 err = zap_count(
496 ds->ds_dir->dd_pool->dp_meta_objset,
497 dsl_dataset_phys(ds)->ds_userrefs_obj,
498 &ds->ds_userrefs);
499 }
500 }
501
502 if (err == 0 && !ds->ds_is_snapshot) {
503 err = dsl_prop_get_int_ds(ds,
504 zfs_prop_to_name(ZFS_PROP_REFRESERVATION),
505 &ds->ds_reserved);
506 if (err == 0) {
507 err = dsl_prop_get_int_ds(ds,
508 zfs_prop_to_name(ZFS_PROP_REFQUOTA),
509 &ds->ds_quota);
510 }
511 } else {
512 ds->ds_reserved = ds->ds_quota = 0;
513 }
514
515 dmu_buf_init_user(&ds->ds_dbu, dsl_dataset_evict, &ds->ds_dbuf);
516 if (err == 0)
517 winner = dmu_buf_set_user_ie(dbuf, &ds->ds_dbu);
518
519 if (err != 0 || winner != NULL) {
520 bplist_destroy(&ds->ds_pending_deadlist);
521 dsl_deadlist_close(&ds->ds_deadlist);
522 if (ds->ds_prev)
523 dsl_dataset_rele(ds->ds_prev, ds);
524 dsl_dir_rele(ds->ds_dir, ds);
525 mutex_destroy(&ds->ds_lock);
526 mutex_destroy(&ds->ds_opening_lock);
527 mutex_destroy(&ds->ds_sendstream_lock);
528 refcount_destroy(&ds->ds_longholds);
529 kmem_free(ds, sizeof (dsl_dataset_t));
530 if (err != 0) {
531 dmu_buf_rele(dbuf, tag);
532 return (err);
533 }
534 ds = winner;
535 } else {
536 ds->ds_fsid_guid =
537 unique_insert(dsl_dataset_phys(ds)->ds_fsid_guid);
538 }
539 }
540 ASSERT3P(ds->ds_dbuf, ==, dbuf);
541 ASSERT3P(dsl_dataset_phys(ds), ==, dbuf->db_data);
542 ASSERT(dsl_dataset_phys(ds)->ds_prev_snap_obj != 0 ||
543 spa_version(dp->dp_spa) < SPA_VERSION_ORIGIN ||
544 dp->dp_origin_snap == NULL || ds == dp->dp_origin_snap);
545 *dsp = ds;
546 return (0);
547 }
548
549 int
550 dsl_dataset_hold(dsl_pool_t *dp, const char *name,
551 void *tag, dsl_dataset_t **dsp)
552 {
553 dsl_dir_t *dd;
554 const char *snapname;
555 uint64_t obj;
556 int err = 0;
557 dsl_dataset_t *ds;
558
559 err = dsl_dir_hold(dp, name, FTAG, &dd, &snapname);
560 if (err != 0)
561 return (err);
562
563 ASSERT(dsl_pool_config_held(dp));
564 obj = dsl_dir_phys(dd)->dd_head_dataset_obj;
565 if (obj != 0)
566 err = dsl_dataset_hold_obj(dp, obj, tag, &ds);
567 else
568 err = SET_ERROR(ENOENT);
569
570 /* we may be looking for a snapshot */
571 if (err == 0 && snapname != NULL) {
572 dsl_dataset_t *snap_ds;
573
574 if (*snapname++ != '@') {
575 dsl_dataset_rele(ds, tag);
576 dsl_dir_rele(dd, FTAG);
577 return (SET_ERROR(ENOENT));
578 }
579
580 dprintf("looking for snapshot '%s'\n", snapname);
581 err = dsl_dataset_snap_lookup(ds, snapname, &obj);
582 if (err == 0)
583 err = dsl_dataset_hold_obj(dp, obj, tag, &snap_ds);
584 dsl_dataset_rele(ds, tag);
585
586 if (err == 0) {
587 mutex_enter(&snap_ds->ds_lock);
588 if (snap_ds->ds_snapname[0] == 0)
589 (void) strlcpy(snap_ds->ds_snapname, snapname,
590 sizeof (snap_ds->ds_snapname));
591 mutex_exit(&snap_ds->ds_lock);
592 ds = snap_ds;
593 }
594 }
595 if (err == 0)
596 *dsp = ds;
597 dsl_dir_rele(dd, FTAG);
598 return (err);
599 }
600
601 int
602 dsl_dataset_own_obj(dsl_pool_t *dp, uint64_t dsobj,
603 void *tag, dsl_dataset_t **dsp)
604 {
605 int err = dsl_dataset_hold_obj(dp, dsobj, tag, dsp);
606 if (err != 0)
607 return (err);
608 if (!dsl_dataset_tryown(*dsp, tag)) {
609 dsl_dataset_rele(*dsp, tag);
610 *dsp = NULL;
611 return (SET_ERROR(EBUSY));
612 }
613 return (0);
614 }
615
616 int
617 dsl_dataset_own(dsl_pool_t *dp, const char *name,
618 void *tag, dsl_dataset_t **dsp)
619 {
620 int err = dsl_dataset_hold(dp, name, tag, dsp);
621 if (err != 0)
622 return (err);
623 if (!dsl_dataset_tryown(*dsp, tag)) {
624 dsl_dataset_rele(*dsp, tag);
625 return (SET_ERROR(EBUSY));
626 }
627 return (0);
628 }
629
630 /*
631 * See the comment above dsl_pool_hold() for details. In summary, a long
632 * hold is used to prevent destruction of a dataset while the pool hold
633 * is dropped, allowing other concurrent operations (e.g. spa_sync()).
634 *
635 * The dataset and pool must be held when this function is called. After it
636 * is called, the pool hold may be released while the dataset is still held
637 * and accessed.
638 */
639 void
640 dsl_dataset_long_hold(dsl_dataset_t *ds, void *tag)
641 {
642 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool));
643 (void) refcount_add(&ds->ds_longholds, tag);
644 }
645
646 void
647 dsl_dataset_long_rele(dsl_dataset_t *ds, void *tag)
648 {
649 (void) refcount_remove(&ds->ds_longholds, tag);
650 }
651
652 /* Return B_TRUE if there are any long holds on this dataset. */
653 boolean_t
654 dsl_dataset_long_held(dsl_dataset_t *ds)
655 {
656 return (!refcount_is_zero(&ds->ds_longholds));
657 }
658
659 void
660 dsl_dataset_name(dsl_dataset_t *ds, char *name)
661 {
662 if (ds == NULL) {
663 (void) strcpy(name, "mos");
664 } else {
665 dsl_dir_name(ds->ds_dir, name);
666 VERIFY0(dsl_dataset_get_snapname(ds));
667 if (ds->ds_snapname[0]) {
668 VERIFY3U(strlcat(name, "@", ZFS_MAX_DATASET_NAME_LEN),
669 <, ZFS_MAX_DATASET_NAME_LEN);
670 /*
671 * We use a "recursive" mutex so that we
672 * can call dprintf_ds() with ds_lock held.
673 */
674 if (!MUTEX_HELD(&ds->ds_lock)) {
675 mutex_enter(&ds->ds_lock);
676 VERIFY3U(strlcat(name, ds->ds_snapname,
677 ZFS_MAX_DATASET_NAME_LEN), <,
678 ZFS_MAX_DATASET_NAME_LEN);
679 mutex_exit(&ds->ds_lock);
680 } else {
681 VERIFY3U(strlcat(name, ds->ds_snapname,
682 ZFS_MAX_DATASET_NAME_LEN), <,
683 ZFS_MAX_DATASET_NAME_LEN);
684 }
685 }
686 }
687 }
688
689 int
690 dsl_dataset_namelen(dsl_dataset_t *ds)
691 {
692 VERIFY0(dsl_dataset_get_snapname(ds));
693 mutex_enter(&ds->ds_lock);
694 int len = dsl_dir_namelen(ds->ds_dir) + 1 + strlen(ds->ds_snapname);
695 mutex_exit(&ds->ds_lock);
696 return (len);
697 }
698
699 void
700 dsl_dataset_rele(dsl_dataset_t *ds, void *tag)
701 {
702 dmu_buf_rele(ds->ds_dbuf, tag);
703 }
704
705 void
706 dsl_dataset_disown(dsl_dataset_t *ds, void *tag)
707 {
708 ASSERT3P(ds->ds_owner, ==, tag);
709 ASSERT(ds->ds_dbuf != NULL);
710
711 mutex_enter(&ds->ds_lock);
712 ds->ds_owner = NULL;
713 mutex_exit(&ds->ds_lock);
714 dsl_dataset_long_rele(ds, tag);
715 dsl_dataset_rele(ds, tag);
716 }
717
718 boolean_t
719 dsl_dataset_tryown(dsl_dataset_t *ds, void *tag)
720 {
721 boolean_t gotit = FALSE;
722
723 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool));
724 mutex_enter(&ds->ds_lock);
725 if (ds->ds_owner == NULL && !DS_IS_INCONSISTENT(ds)) {
726 ds->ds_owner = tag;
727 dsl_dataset_long_hold(ds, tag);
728 gotit = TRUE;
729 }
730 mutex_exit(&ds->ds_lock);
731 return (gotit);
732 }
733
734 boolean_t
735 dsl_dataset_has_owner(dsl_dataset_t *ds)
736 {
737 boolean_t rv;
738 mutex_enter(&ds->ds_lock);
739 rv = (ds->ds_owner != NULL);
740 mutex_exit(&ds->ds_lock);
741 return (rv);
742 }
743
744 static void
745 dsl_dataset_activate_feature(uint64_t dsobj, spa_feature_t f, dmu_tx_t *tx)
746 {
747 spa_t *spa = dmu_tx_pool(tx)->dp_spa;
748 objset_t *mos = dmu_tx_pool(tx)->dp_meta_objset;
749 uint64_t zero = 0;
750
751 VERIFY(spa_feature_table[f].fi_flags & ZFEATURE_FLAG_PER_DATASET);
752
753 spa_feature_incr(spa, f, tx);
754 dmu_object_zapify(mos, dsobj, DMU_OT_DSL_DATASET, tx);
755
756 VERIFY0(zap_add(mos, dsobj, spa_feature_table[f].fi_guid,
757 sizeof (zero), 1, &zero, tx));
758 }
759
760 void
761 dsl_dataset_deactivate_feature(uint64_t dsobj, spa_feature_t f, dmu_tx_t *tx)
762 {
763 spa_t *spa = dmu_tx_pool(tx)->dp_spa;
764 objset_t *mos = dmu_tx_pool(tx)->dp_meta_objset;
765
766 VERIFY(spa_feature_table[f].fi_flags & ZFEATURE_FLAG_PER_DATASET);
767
768 VERIFY0(zap_remove(mos, dsobj, spa_feature_table[f].fi_guid, tx));
769 spa_feature_decr(spa, f, tx);
770 }
771
772 uint64_t
773 dsl_dataset_create_sync_dd(dsl_dir_t *dd, dsl_dataset_t *origin,
774 uint64_t flags, dmu_tx_t *tx)
775 {
776 dsl_pool_t *dp = dd->dd_pool;
777 dmu_buf_t *dbuf;
778 dsl_dataset_phys_t *dsphys;
779 uint64_t dsobj;
780 objset_t *mos = dp->dp_meta_objset;
781
782 if (origin == NULL)
783 origin = dp->dp_origin_snap;
784
785 ASSERT(origin == NULL || origin->ds_dir->dd_pool == dp);
786 ASSERT(origin == NULL || dsl_dataset_phys(origin)->ds_num_children > 0);
787 ASSERT(dmu_tx_is_syncing(tx));
788 ASSERT(dsl_dir_phys(dd)->dd_head_dataset_obj == 0);
789
790 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0,
791 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx);
792 VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf));
793 dmu_buf_will_dirty(dbuf, tx);
794 dsphys = dbuf->db_data;
795 bzero(dsphys, sizeof (dsl_dataset_phys_t));
796 dsphys->ds_dir_obj = dd->dd_object;
797 dsphys->ds_flags = flags;
798 dsphys->ds_fsid_guid = unique_create();
799 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid,
800 sizeof (dsphys->ds_guid));
801 dsphys->ds_snapnames_zapobj =
802 zap_create_norm(mos, U8_TEXTPREP_TOUPPER, DMU_OT_DSL_DS_SNAP_MAP,
803 DMU_OT_NONE, 0, tx);
804 dsphys->ds_creation_time = gethrestime_sec();
805 dsphys->ds_creation_txg = tx->tx_txg == TXG_INITIAL ? 1 : tx->tx_txg;
806
807 if (origin == NULL) {
808 dsphys->ds_deadlist_obj = dsl_deadlist_alloc(mos, tx);
809 } else {
810 dsl_dataset_t *ohds; /* head of the origin snapshot */
811
812 dsphys->ds_prev_snap_obj = origin->ds_object;
813 dsphys->ds_prev_snap_txg =
814 dsl_dataset_phys(origin)->ds_creation_txg;
815 dsphys->ds_referenced_bytes =
816 dsl_dataset_phys(origin)->ds_referenced_bytes;
817 dsphys->ds_compressed_bytes =
818 dsl_dataset_phys(origin)->ds_compressed_bytes;
819 dsphys->ds_uncompressed_bytes =
820 dsl_dataset_phys(origin)->ds_uncompressed_bytes;
821 dsphys->ds_bp = dsl_dataset_phys(origin)->ds_bp;
822
823 /*
824 * Inherit flags that describe the dataset's contents
825 * (INCONSISTENT) or properties (Case Insensitive).
826 */
827 dsphys->ds_flags |= dsl_dataset_phys(origin)->ds_flags &
828 (DS_FLAG_INCONSISTENT | DS_FLAG_CI_DATASET);
829
830 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) {
831 if (origin->ds_feature_inuse[f])
832 dsl_dataset_activate_feature(dsobj, f, tx);
833 }
834
835 dmu_buf_will_dirty(origin->ds_dbuf, tx);
836 dsl_dataset_phys(origin)->ds_num_children++;
837
838 VERIFY0(dsl_dataset_hold_obj(dp,
839 dsl_dir_phys(origin->ds_dir)->dd_head_dataset_obj,
840 FTAG, &ohds));
841 dsphys->ds_deadlist_obj = dsl_deadlist_clone(&ohds->ds_deadlist,
842 dsphys->ds_prev_snap_txg, dsphys->ds_prev_snap_obj, tx);
843 dsl_dataset_rele(ohds, FTAG);
844
845 if (spa_version(dp->dp_spa) >= SPA_VERSION_NEXT_CLONES) {
846 if (dsl_dataset_phys(origin)->ds_next_clones_obj == 0) {
847 dsl_dataset_phys(origin)->ds_next_clones_obj =
848 zap_create(mos,
849 DMU_OT_NEXT_CLONES, DMU_OT_NONE, 0, tx);
850 }
851 VERIFY0(zap_add_int(mos,
852 dsl_dataset_phys(origin)->ds_next_clones_obj,
853 dsobj, tx));
854 }
855
856 dmu_buf_will_dirty(dd->dd_dbuf, tx);
857 dsl_dir_phys(dd)->dd_origin_obj = origin->ds_object;
858 if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) {
859 if (dsl_dir_phys(origin->ds_dir)->dd_clones == 0) {
860 dmu_buf_will_dirty(origin->ds_dir->dd_dbuf, tx);
861 dsl_dir_phys(origin->ds_dir)->dd_clones =
862 zap_create(mos,
863 DMU_OT_DSL_CLONES, DMU_OT_NONE, 0, tx);
864 }
865 VERIFY0(zap_add_int(mos,
866 dsl_dir_phys(origin->ds_dir)->dd_clones,
867 dsobj, tx));
868 }
869 }
870
871 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE)
872 dsphys->ds_flags |= DS_FLAG_UNIQUE_ACCURATE;
873
874 dmu_buf_rele(dbuf, FTAG);
875
876 dmu_buf_will_dirty(dd->dd_dbuf, tx);
877 dsl_dir_phys(dd)->dd_head_dataset_obj = dsobj;
878
879 return (dsobj);
880 }
881
882 static void
883 dsl_dataset_zero_zil(dsl_dataset_t *ds, dmu_tx_t *tx)
884 {
885 objset_t *os;
886
887 VERIFY0(dmu_objset_from_ds(ds, &os));
888 bzero(&os->os_zil_header, sizeof (os->os_zil_header));
889 dsl_dataset_dirty(ds, tx);
890 }
891
892 uint64_t
893 dsl_dataset_create_sync(dsl_dir_t *pdd, const char *lastname,
894 dsl_dataset_t *origin, uint64_t flags, cred_t *cr, dmu_tx_t *tx)
895 {
896 dsl_pool_t *dp = pdd->dd_pool;
897 uint64_t dsobj, ddobj;
898 dsl_dir_t *dd;
899
900 ASSERT(dmu_tx_is_syncing(tx));
901 ASSERT(lastname[0] != '@');
902
903 ddobj = dsl_dir_create_sync(dp, pdd, lastname, tx);
904 VERIFY0(dsl_dir_hold_obj(dp, ddobj, lastname, FTAG, &dd));
905
906 dsobj = dsl_dataset_create_sync_dd(dd, origin,
907 flags & ~DS_CREATE_FLAG_NODIRTY, tx);
908
909 dsl_deleg_set_create_perms(dd, tx, cr);
910
911 /*
912 * Since we're creating a new node we know it's a leaf, so we can
913 * initialize the counts if the limit feature is active.
914 */
915 if (spa_feature_is_active(dp->dp_spa, SPA_FEATURE_FS_SS_LIMIT)) {
916 uint64_t cnt = 0;
917 objset_t *os = dd->dd_pool->dp_meta_objset;
918
919 dsl_dir_zapify(dd, tx);
920 VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_FILESYSTEM_COUNT,
921 sizeof (cnt), 1, &cnt, tx));
922 VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_SNAPSHOT_COUNT,
923 sizeof (cnt), 1, &cnt, tx));
924 }
925
926 dsl_dir_rele(dd, FTAG);
927
928 /*
929 * If we are creating a clone, make sure we zero out any stale
930 * data from the origin snapshots zil header.
931 */
932 if (origin != NULL && !(flags & DS_CREATE_FLAG_NODIRTY)) {
933 dsl_dataset_t *ds;
934
935 VERIFY0(dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds));
936 dsl_dataset_zero_zil(ds, tx);
937 dsl_dataset_rele(ds, FTAG);
938 }
939
940 return (dsobj);
941 }
942
943 /*
944 * The unique space in the head dataset can be calculated by subtracting
945 * the space used in the most recent snapshot, that is still being used
946 * in this file system, from the space currently in use. To figure out
947 * the space in the most recent snapshot still in use, we need to take
948 * the total space used in the snapshot and subtract out the space that
949 * has been freed up since the snapshot was taken.
950 */
951 void
952 dsl_dataset_recalc_head_uniq(dsl_dataset_t *ds)
953 {
954 uint64_t mrs_used;
955 uint64_t dlused, dlcomp, dluncomp;
956
957 ASSERT(!ds->ds_is_snapshot);
958
959 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0)
960 mrs_used = dsl_dataset_phys(ds->ds_prev)->ds_referenced_bytes;
961 else
962 mrs_used = 0;
963
964 dsl_deadlist_space(&ds->ds_deadlist, &dlused, &dlcomp, &dluncomp);
965
966 ASSERT3U(dlused, <=, mrs_used);
967 dsl_dataset_phys(ds)->ds_unique_bytes =
968 dsl_dataset_phys(ds)->ds_referenced_bytes - (mrs_used - dlused);
969
970 if (spa_version(ds->ds_dir->dd_pool->dp_spa) >=
971 SPA_VERSION_UNIQUE_ACCURATE)
972 dsl_dataset_phys(ds)->ds_flags |= DS_FLAG_UNIQUE_ACCURATE;
973 }
974
975 void
976 dsl_dataset_remove_from_next_clones(dsl_dataset_t *ds, uint64_t obj,
977 dmu_tx_t *tx)
978 {
979 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
980 uint64_t count;
981 int err;
982
983 ASSERT(dsl_dataset_phys(ds)->ds_num_children >= 2);
984 err = zap_remove_int(mos, dsl_dataset_phys(ds)->ds_next_clones_obj,
985 obj, tx);
986 /*
987 * The err should not be ENOENT, but a bug in a previous version
988 * of the code could cause upgrade_clones_cb() to not set
989 * ds_next_snap_obj when it should, leading to a missing entry.
990 * If we knew that the pool was created after
991 * SPA_VERSION_NEXT_CLONES, we could assert that it isn't
992 * ENOENT. However, at least we can check that we don't have
993 * too many entries in the next_clones_obj even after failing to
994 * remove this one.
995 */
996 if (err != ENOENT)
997 VERIFY0(err);
998 ASSERT0(zap_count(mos, dsl_dataset_phys(ds)->ds_next_clones_obj,
999 &count));
1000 ASSERT3U(count, <=, dsl_dataset_phys(ds)->ds_num_children - 2);
1001 }
1002
1003
1004 blkptr_t *
1005 dsl_dataset_get_blkptr(dsl_dataset_t *ds)
1006 {
1007 return (&dsl_dataset_phys(ds)->ds_bp);
1008 }
1009
1010 spa_t *
1011 dsl_dataset_get_spa(dsl_dataset_t *ds)
1012 {
1013 return (ds->ds_dir->dd_pool->dp_spa);
1014 }
1015
1016 void
1017 dsl_dataset_dirty(dsl_dataset_t *ds, dmu_tx_t *tx)
1018 {
1019 dsl_pool_t *dp;
1020
1021 if (ds == NULL) /* this is the meta-objset */
1022 return;
1023
1024 ASSERT(ds->ds_objset != NULL);
1025
1026 if (dsl_dataset_phys(ds)->ds_next_snap_obj != 0)
1027 panic("dirtying snapshot!");
1028
1029 dp = ds->ds_dir->dd_pool;
1030
1031 if (txg_list_add(&dp->dp_dirty_datasets, ds, tx->tx_txg)) {
1032 /* up the hold count until we can be written out */
1033 dmu_buf_add_ref(ds->ds_dbuf, ds);
1034 }
1035 }
1036
1037 boolean_t
1038 dsl_dataset_is_dirty(dsl_dataset_t *ds)
1039 {
1040 for (int t = 0; t < TXG_SIZE; t++) {
1041 if (txg_list_member(&ds->ds_dir->dd_pool->dp_dirty_datasets,
1042 ds, t))
1043 return (B_TRUE);
1044 }
1045 return (B_FALSE);
1046 }
1047
1048 static int
1049 dsl_dataset_snapshot_reserve_space(dsl_dataset_t *ds, dmu_tx_t *tx)
1050 {
1051 uint64_t asize;
1052
1053 if (!dmu_tx_is_syncing(tx))
1054 return (0);
1055
1056 /*
1057 * If there's an fs-only reservation, any blocks that might become
1058 * owned by the snapshot dataset must be accommodated by space
1059 * outside of the reservation.
1060 */
1061 ASSERT(ds->ds_reserved == 0 || DS_UNIQUE_IS_ACCURATE(ds));
1062 asize = MIN(dsl_dataset_phys(ds)->ds_unique_bytes, ds->ds_reserved);
1063 if (asize > dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE))
1064 return (SET_ERROR(ENOSPC));
1065
1066 /*
1067 * Propagate any reserved space for this snapshot to other
1068 * snapshot checks in this sync group.
1069 */
1070 if (asize > 0)
1071 dsl_dir_willuse_space(ds->ds_dir, asize, tx);
1072
1073 return (0);
1074 }
1075
1076 typedef struct dsl_dataset_snapshot_arg {
1077 nvlist_t *ddsa_snaps;
1078 nvlist_t *ddsa_props;
1079 nvlist_t *ddsa_errors;
1080 cred_t *ddsa_cr;
1081 } dsl_dataset_snapshot_arg_t;
1082
1083 int
1084 dsl_dataset_snapshot_check_impl(dsl_dataset_t *ds, const char *snapname,
1085 dmu_tx_t *tx, boolean_t recv, uint64_t cnt, cred_t *cr)
1086 {
1087 int error;
1088 uint64_t value;
1089
1090 ds->ds_trysnap_txg = tx->tx_txg;
1091
1092 if (!dmu_tx_is_syncing(tx))
1093 return (0);
1094
1095 /*
1096 * We don't allow multiple snapshots of the same txg. If there
1097 * is already one, try again.
1098 */
1099 if (dsl_dataset_phys(ds)->ds_prev_snap_txg >= tx->tx_txg)
1100 return (SET_ERROR(EAGAIN));
1101
1102 /*
1103 * Check for conflicting snapshot name.
1104 */
1105 error = dsl_dataset_snap_lookup(ds, snapname, &value);
1106 if (error == 0)
1107 return (SET_ERROR(EEXIST));
1108 if (error != ENOENT)
1109 return (error);
1110
1111 /*
1112 * We don't allow taking snapshots of inconsistent datasets, such as
1113 * those into which we are currently receiving. However, if we are
1114 * creating this snapshot as part of a receive, this check will be
1115 * executed atomically with respect to the completion of the receive
1116 * itself but prior to the clearing of DS_FLAG_INCONSISTENT; in this
1117 * case we ignore this, knowing it will be fixed up for us shortly in
1118 * dmu_recv_end_sync().
1119 */
1120 if (!recv && DS_IS_INCONSISTENT(ds))
1121 return (SET_ERROR(EBUSY));
1122
1123 /*
1124 * Skip the check for temporary snapshots or if we have already checked
1125 * the counts in dsl_dataset_snapshot_check. This means we really only
1126 * check the count here when we're receiving a stream.
1127 */
1128 if (cnt != 0 && cr != NULL) {
1129 error = dsl_fs_ss_limit_check(ds->ds_dir, cnt,
1130 ZFS_PROP_SNAPSHOT_LIMIT, NULL, cr);
1131 if (error != 0)
1132 return (error);
1133 }
1134
1135 error = dsl_dataset_snapshot_reserve_space(ds, tx);
1136 if (error != 0)
1137 return (error);
1138
1139 return (0);
1140 }
1141
1142 static int
1143 dsl_dataset_snapshot_check(void *arg, dmu_tx_t *tx)
1144 {
1145 dsl_dataset_snapshot_arg_t *ddsa = arg;
1146 dsl_pool_t *dp = dmu_tx_pool(tx);
1147 nvpair_t *pair;
1148 int rv = 0;
1149
1150 /*
1151 * Pre-compute how many total new snapshots will be created for each
1152 * level in the tree and below. This is needed for validating the
1153 * snapshot limit when either taking a recursive snapshot or when
1154 * taking multiple snapshots.
1155 *
1156 * The problem is that the counts are not actually adjusted when
1157 * we are checking, only when we finally sync. For a single snapshot,
1158 * this is easy, the count will increase by 1 at each node up the tree,
1159 * but its more complicated for the recursive/multiple snapshot case.
1160 *
1161 * The dsl_fs_ss_limit_check function does recursively check the count
1162 * at each level up the tree but since it is validating each snapshot
1163 * independently we need to be sure that we are validating the complete
1164 * count for the entire set of snapshots. We do this by rolling up the
1165 * counts for each component of the name into an nvlist and then
1166 * checking each of those cases with the aggregated count.
1167 *
1168 * This approach properly handles not only the recursive snapshot
1169 * case (where we get all of those on the ddsa_snaps list) but also
1170 * the sibling case (e.g. snapshot a/b and a/c so that we will also
1171 * validate the limit on 'a' using a count of 2).
1172 *
1173 * We validate the snapshot names in the third loop and only report
1174 * name errors once.
1175 */
1176 if (dmu_tx_is_syncing(tx)) {
1177 nvlist_t *cnt_track = NULL;
1178 cnt_track = fnvlist_alloc();
1179
1180 /* Rollup aggregated counts into the cnt_track list */
1181 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL);
1182 pair != NULL;
1183 pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) {
1184 char *pdelim;
1185 uint64_t val;
1186 char nm[MAXPATHLEN];
1187
1188 (void) strlcpy(nm, nvpair_name(pair), sizeof (nm));
1189 pdelim = strchr(nm, '@');
1190 if (pdelim == NULL)
1191 continue;
1192 *pdelim = '\0';
1193
1194 do {
1195 if (nvlist_lookup_uint64(cnt_track, nm,
1196 &val) == 0) {
1197 /* update existing entry */
1198 fnvlist_add_uint64(cnt_track, nm,
1199 val + 1);
1200 } else {
1201 /* add to list */
1202 fnvlist_add_uint64(cnt_track, nm, 1);
1203 }
1204
1205 pdelim = strrchr(nm, '/');
1206 if (pdelim != NULL)
1207 *pdelim = '\0';
1208 } while (pdelim != NULL);
1209 }
1210
1211 /* Check aggregated counts at each level */
1212 for (pair = nvlist_next_nvpair(cnt_track, NULL);
1213 pair != NULL; pair = nvlist_next_nvpair(cnt_track, pair)) {
1214 int error = 0;
1215 char *name;
1216 uint64_t cnt = 0;
1217 dsl_dataset_t *ds;
1218
1219 name = nvpair_name(pair);
1220 cnt = fnvpair_value_uint64(pair);
1221 ASSERT(cnt > 0);
1222
1223 error = dsl_dataset_hold(dp, name, FTAG, &ds);
1224 if (error == 0) {
1225 error = dsl_fs_ss_limit_check(ds->ds_dir, cnt,
1226 ZFS_PROP_SNAPSHOT_LIMIT, NULL,
1227 ddsa->ddsa_cr);
1228 dsl_dataset_rele(ds, FTAG);
1229 }
1230
1231 if (error != 0) {
1232 if (ddsa->ddsa_errors != NULL)
1233 fnvlist_add_int32(ddsa->ddsa_errors,
1234 name, error);
1235 rv = error;
1236 /* only report one error for this check */
1237 break;
1238 }
1239 }
1240 nvlist_free(cnt_track);
1241 }
1242
1243 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL);
1244 pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) {
1245 int error = 0;
1246 dsl_dataset_t *ds;
1247 char *name, *atp;
1248 char dsname[ZFS_MAX_DATASET_NAME_LEN];
1249
1250 name = nvpair_name(pair);
1251 if (strlen(name) >= ZFS_MAX_DATASET_NAME_LEN)
1252 error = SET_ERROR(ENAMETOOLONG);
1253 if (error == 0) {
1254 atp = strchr(name, '@');
1255 if (atp == NULL)
1256 error = SET_ERROR(EINVAL);
1257 if (error == 0)
1258 (void) strlcpy(dsname, name, atp - name + 1);
1259 }
1260 if (error == 0)
1261 error = dsl_dataset_hold(dp, dsname, FTAG, &ds);
1262 if (error == 0) {
1263 /* passing 0/NULL skips dsl_fs_ss_limit_check */
1264 error = dsl_dataset_snapshot_check_impl(ds,
1265 atp + 1, tx, B_FALSE, 0, NULL);
1266 dsl_dataset_rele(ds, FTAG);
1267 }
1268
1269 if (error != 0) {
1270 if (ddsa->ddsa_errors != NULL) {
1271 fnvlist_add_int32(ddsa->ddsa_errors,
1272 name, error);
1273 }
1274 rv = error;
1275 }
1276 }
1277
1278 return (rv);
1279 }
1280
1281 void
1282 dsl_dataset_snapshot_sync_impl(dsl_dataset_t *ds, const char *snapname,
1283 dmu_tx_t *tx)
1284 {
1285 static zil_header_t zero_zil;
1286
1287 dsl_pool_t *dp = ds->ds_dir->dd_pool;
1288 dmu_buf_t *dbuf;
1289 dsl_dataset_phys_t *dsphys;
1290 uint64_t dsobj, crtxg;
1291 objset_t *mos = dp->dp_meta_objset;
1292 objset_t *os;
1293
1294 ASSERT(RRW_WRITE_HELD(&dp->dp_config_rwlock));
1295
1296 /*
1297 * If we are on an old pool, the zil must not be active, in which
1298 * case it will be zeroed. Usually zil_suspend() accomplishes this.
1299 */
1300 ASSERT(spa_version(dmu_tx_pool(tx)->dp_spa) >= SPA_VERSION_FAST_SNAP ||
1301 dmu_objset_from_ds(ds, &os) != 0 ||
1302 bcmp(&os->os_phys->os_zil_header, &zero_zil,
1303 sizeof (zero_zil)) == 0);
1304
1305 dsl_fs_ss_count_adjust(ds->ds_dir, 1, DD_FIELD_SNAPSHOT_COUNT, tx);
1306
1307 /*
1308 * The origin's ds_creation_txg has to be < TXG_INITIAL
1309 */
1310 if (strcmp(snapname, ORIGIN_DIR_NAME) == 0)
1311 crtxg = 1;
1312 else
1313 crtxg = tx->tx_txg;
1314
1315 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0,
1316 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx);
1317 VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf));
1318 dmu_buf_will_dirty(dbuf, tx);
1319 dsphys = dbuf->db_data;
1320 bzero(dsphys, sizeof (dsl_dataset_phys_t));
1321 dsphys->ds_dir_obj = ds->ds_dir->dd_object;
1322 dsphys->ds_fsid_guid = unique_create();
1323 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid,
1324 sizeof (dsphys->ds_guid));
1325 dsphys->ds_prev_snap_obj = dsl_dataset_phys(ds)->ds_prev_snap_obj;
1326 dsphys->ds_prev_snap_txg = dsl_dataset_phys(ds)->ds_prev_snap_txg;
1327 dsphys->ds_next_snap_obj = ds->ds_object;
1328 dsphys->ds_num_children = 1;
1329 dsphys->ds_creation_time = gethrestime_sec();
1330 dsphys->ds_creation_txg = crtxg;
1331 dsphys->ds_deadlist_obj = dsl_dataset_phys(ds)->ds_deadlist_obj;
1332 dsphys->ds_referenced_bytes = dsl_dataset_phys(ds)->ds_referenced_bytes;
1333 dsphys->ds_compressed_bytes = dsl_dataset_phys(ds)->ds_compressed_bytes;
1334 dsphys->ds_uncompressed_bytes =
1335 dsl_dataset_phys(ds)->ds_uncompressed_bytes;
1336 dsphys->ds_flags = dsl_dataset_phys(ds)->ds_flags;
1337 dsphys->ds_bp = dsl_dataset_phys(ds)->ds_bp;
1338 dmu_buf_rele(dbuf, FTAG);
1339
1340 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) {
1341 if (ds->ds_feature_inuse[f])
1342 dsl_dataset_activate_feature(dsobj, f, tx);
1343 }
1344
1345 ASSERT3U(ds->ds_prev != 0, ==,
1346 dsl_dataset_phys(ds)->ds_prev_snap_obj != 0);
1347 if (ds->ds_prev) {
1348 uint64_t next_clones_obj =
1349 dsl_dataset_phys(ds->ds_prev)->ds_next_clones_obj;
1350 ASSERT(dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj ==
1351 ds->ds_object ||
1352 dsl_dataset_phys(ds->ds_prev)->ds_num_children > 1);
1353 if (dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj ==
1354 ds->ds_object) {
1355 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx);
1356 ASSERT3U(dsl_dataset_phys(ds)->ds_prev_snap_txg, ==,
1357 dsl_dataset_phys(ds->ds_prev)->ds_creation_txg);
1358 dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj = dsobj;
1359 } else if (next_clones_obj != 0) {
1360 dsl_dataset_remove_from_next_clones(ds->ds_prev,
1361 dsphys->ds_next_snap_obj, tx);
1362 VERIFY0(zap_add_int(mos,
1363 next_clones_obj, dsobj, tx));
1364 }
1365 }
1366
1367 /*
1368 * If we have a reference-reservation on this dataset, we will
1369 * need to increase the amount of refreservation being charged
1370 * since our unique space is going to zero.
1371 */
1372 if (ds->ds_reserved) {
1373 int64_t delta;
1374 ASSERT(DS_UNIQUE_IS_ACCURATE(ds));
1375 delta = MIN(dsl_dataset_phys(ds)->ds_unique_bytes,
1376 ds->ds_reserved);
1377 dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV,
1378 delta, 0, 0, tx);
1379 }
1380
1381 dmu_buf_will_dirty(ds->ds_dbuf, tx);
1382 dsl_dataset_phys(ds)->ds_deadlist_obj =
1383 dsl_deadlist_clone(&ds->ds_deadlist, UINT64_MAX,
1384 dsl_dataset_phys(ds)->ds_prev_snap_obj, tx);
1385 dsl_deadlist_close(&ds->ds_deadlist);
1386 dsl_deadlist_open(&ds->ds_deadlist, mos,
1387 dsl_dataset_phys(ds)->ds_deadlist_obj);
1388 dsl_deadlist_add_key(&ds->ds_deadlist,
1389 dsl_dataset_phys(ds)->ds_prev_snap_txg, tx);
1390
1391 ASSERT3U(dsl_dataset_phys(ds)->ds_prev_snap_txg, <, tx->tx_txg);
1392 dsl_dataset_phys(ds)->ds_prev_snap_obj = dsobj;
1393 dsl_dataset_phys(ds)->ds_prev_snap_txg = crtxg;
1394 dsl_dataset_phys(ds)->ds_unique_bytes = 0;
1395 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE)
1396 dsl_dataset_phys(ds)->ds_flags |= DS_FLAG_UNIQUE_ACCURATE;
1397
1398 VERIFY0(zap_add(mos, dsl_dataset_phys(ds)->ds_snapnames_zapobj,
1399 snapname, 8, 1, &dsobj, tx));
1400
1401 if (ds->ds_prev)
1402 dsl_dataset_rele(ds->ds_prev, ds);
1403 VERIFY0(dsl_dataset_hold_obj(dp,
1404 dsl_dataset_phys(ds)->ds_prev_snap_obj, ds, &ds->ds_prev));
1405
1406 dsl_scan_ds_snapshotted(ds, tx);
1407
1408 dsl_dir_snap_cmtime_update(ds->ds_dir);
1409
1410 spa_history_log_internal_ds(ds->ds_prev, "snapshot", tx, "");
1411 }
1412
1413 static void
1414 dsl_dataset_snapshot_sync(void *arg, dmu_tx_t *tx)
1415 {
1416 dsl_dataset_snapshot_arg_t *ddsa = arg;
1417 dsl_pool_t *dp = dmu_tx_pool(tx);
1418 nvpair_t *pair;
1419
1420 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL);
1421 pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) {
1422 dsl_dataset_t *ds;
1423 char *name, *atp;
1424 char dsname[ZFS_MAX_DATASET_NAME_LEN];
1425
1426 name = nvpair_name(pair);
1427 atp = strchr(name, '@');
1428 (void) strlcpy(dsname, name, atp - name + 1);
1429 VERIFY0(dsl_dataset_hold(dp, dsname, FTAG, &ds));
1430
1431 dsl_dataset_snapshot_sync_impl(ds, atp + 1, tx);
1432 if (ddsa->ddsa_props != NULL) {
1433 dsl_props_set_sync_impl(ds->ds_prev,
1434 ZPROP_SRC_LOCAL, ddsa->ddsa_props, tx);
1435 }
1436 dsl_dataset_rele(ds, FTAG);
1437 }
1438 }
1439
1440 /*
1441 * The snapshots must all be in the same pool.
1442 * All-or-nothing: if there are any failures, nothing will be modified.
1443 */
1444 int
1445 dsl_dataset_snapshot(nvlist_t *snaps, nvlist_t *props, nvlist_t *errors)
1446 {
1447 dsl_dataset_snapshot_arg_t ddsa;
1448 nvpair_t *pair;
1449 boolean_t needsuspend;
1450 int error;
1451 spa_t *spa;
1452 char *firstname;
1453 nvlist_t *suspended = NULL;
1454
1455 pair = nvlist_next_nvpair(snaps, NULL);
1456 if (pair == NULL)
1457 return (0);
1458 firstname = nvpair_name(pair);
1459
1460 error = spa_open(firstname, &spa, FTAG);
1461 if (error != 0)
1462 return (error);
1463 needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP);
1464 spa_close(spa, FTAG);
1465
1466 if (needsuspend) {
1467 suspended = fnvlist_alloc();
1468 for (pair = nvlist_next_nvpair(snaps, NULL); pair != NULL;
1469 pair = nvlist_next_nvpair(snaps, pair)) {
1470 char fsname[ZFS_MAX_DATASET_NAME_LEN];
1471 char *snapname = nvpair_name(pair);
1472 char *atp;
1473 void *cookie;
1474
1475 atp = strchr(snapname, '@');
1476 if (atp == NULL) {
1477 error = SET_ERROR(EINVAL);
1478 break;
1479 }
1480 (void) strlcpy(fsname, snapname, atp - snapname + 1);
1481
1482 error = zil_suspend(fsname, &cookie);
1483 if (error != 0)
1484 break;
1485 fnvlist_add_uint64(suspended, fsname,
1486 (uintptr_t)cookie);
1487 }
1488 }
1489
1490 ddsa.ddsa_snaps = snaps;
1491 ddsa.ddsa_props = props;
1492 ddsa.ddsa_errors = errors;
1493 ddsa.ddsa_cr = CRED();
1494
1495 if (error == 0) {
1496 error = dsl_sync_task(firstname, dsl_dataset_snapshot_check,
1497 dsl_dataset_snapshot_sync, &ddsa,
1498 fnvlist_num_pairs(snaps) * 3, ZFS_SPACE_CHECK_NORMAL);
1499 }
1500
1501 if (suspended != NULL) {
1502 for (pair = nvlist_next_nvpair(suspended, NULL); pair != NULL;
1503 pair = nvlist_next_nvpair(suspended, pair)) {
1504 zil_resume((void *)(uintptr_t)
1505 fnvpair_value_uint64(pair));
1506 }
1507 fnvlist_free(suspended);
1508 }
1509
1510 return (error);
1511 }
1512
1513 typedef struct dsl_dataset_snapshot_tmp_arg {
1514 const char *ddsta_fsname;
1515 const char *ddsta_snapname;
1516 minor_t ddsta_cleanup_minor;
1517 const char *ddsta_htag;
1518 } dsl_dataset_snapshot_tmp_arg_t;
1519
1520 static int
1521 dsl_dataset_snapshot_tmp_check(void *arg, dmu_tx_t *tx)
1522 {
1523 dsl_dataset_snapshot_tmp_arg_t *ddsta = arg;
1524 dsl_pool_t *dp = dmu_tx_pool(tx);
1525 dsl_dataset_t *ds;
1526 int error;
1527
1528 error = dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds);
1529 if (error != 0)
1530 return (error);
1531
1532 /* NULL cred means no limit check for tmp snapshot */
1533 error = dsl_dataset_snapshot_check_impl(ds, ddsta->ddsta_snapname,
1534 tx, B_FALSE, 0, NULL);
1535 if (error != 0) {
1536 dsl_dataset_rele(ds, FTAG);
1537 return (error);
1538 }
1539
1540 if (spa_version(dp->dp_spa) < SPA_VERSION_USERREFS) {
1541 dsl_dataset_rele(ds, FTAG);
1542 return (SET_ERROR(ENOTSUP));
1543 }
1544 error = dsl_dataset_user_hold_check_one(NULL, ddsta->ddsta_htag,
1545 B_TRUE, tx);
1546 if (error != 0) {
1547 dsl_dataset_rele(ds, FTAG);
1548 return (error);
1549 }
1550
1551 dsl_dataset_rele(ds, FTAG);
1552 return (0);
1553 }
1554
1555 static void
1556 dsl_dataset_snapshot_tmp_sync(void *arg, dmu_tx_t *tx)
1557 {
1558 dsl_dataset_snapshot_tmp_arg_t *ddsta = arg;
1559 dsl_pool_t *dp = dmu_tx_pool(tx);
1560 dsl_dataset_t *ds;
1561
1562 VERIFY0(dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds));
1563
1564 dsl_dataset_snapshot_sync_impl(ds, ddsta->ddsta_snapname, tx);
1565 dsl_dataset_user_hold_sync_one(ds->ds_prev, ddsta->ddsta_htag,
1566 ddsta->ddsta_cleanup_minor, gethrestime_sec(), tx);
1567 dsl_destroy_snapshot_sync_impl(ds->ds_prev, B_TRUE, tx);
1568
1569 dsl_dataset_rele(ds, FTAG);
1570 }
1571
1572 int
1573 dsl_dataset_snapshot_tmp(const char *fsname, const char *snapname,
1574 minor_t cleanup_minor, const char *htag)
1575 {
1576 dsl_dataset_snapshot_tmp_arg_t ddsta;
1577 int error;
1578 spa_t *spa;
1579 boolean_t needsuspend;
1580 void *cookie;
1581
1582 ddsta.ddsta_fsname = fsname;
1583 ddsta.ddsta_snapname = snapname;
1584 ddsta.ddsta_cleanup_minor = cleanup_minor;
1585 ddsta.ddsta_htag = htag;
1586
1587 error = spa_open(fsname, &spa, FTAG);
1588 if (error != 0)
1589 return (error);
1590 needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP);
1591 spa_close(spa, FTAG);
1592
1593 if (needsuspend) {
1594 error = zil_suspend(fsname, &cookie);
1595 if (error != 0)
1596 return (error);
1597 }
1598
1599 error = dsl_sync_task(fsname, dsl_dataset_snapshot_tmp_check,
1600 dsl_dataset_snapshot_tmp_sync, &ddsta, 3, ZFS_SPACE_CHECK_RESERVED);
1601
1602 if (needsuspend)
1603 zil_resume(cookie);
1604 return (error);
1605 }
1606
1607
1608 void
1609 dsl_dataset_sync(dsl_dataset_t *ds, zio_t *zio, dmu_tx_t *tx)
1610 {
1611 ASSERT(dmu_tx_is_syncing(tx));
1612 ASSERT(ds->ds_objset != NULL);
1613 ASSERT(dsl_dataset_phys(ds)->ds_next_snap_obj == 0);
1614
1615 /*
1616 * in case we had to change ds_fsid_guid when we opened it,
1617 * sync it out now.
1618 */
1619 dmu_buf_will_dirty(ds->ds_dbuf, tx);
1620 dsl_dataset_phys(ds)->ds_fsid_guid = ds->ds_fsid_guid;
1621
1622 if (ds->ds_resume_bytes[tx->tx_txg & TXG_MASK] != 0) {
1623 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset,
1624 ds->ds_object, DS_FIELD_RESUME_OBJECT, 8, 1,
1625 &ds->ds_resume_object[tx->tx_txg & TXG_MASK], tx));
1626 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset,
1627 ds->ds_object, DS_FIELD_RESUME_OFFSET, 8, 1,
1628 &ds->ds_resume_offset[tx->tx_txg & TXG_MASK], tx));
1629 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset,
1630 ds->ds_object, DS_FIELD_RESUME_BYTES, 8, 1,
1631 &ds->ds_resume_bytes[tx->tx_txg & TXG_MASK], tx));
1632 ds->ds_resume_object[tx->tx_txg & TXG_MASK] = 0;
1633 ds->ds_resume_offset[tx->tx_txg & TXG_MASK] = 0;
1634 ds->ds_resume_bytes[tx->tx_txg & TXG_MASK] = 0;
1635 }
1636
1637 dmu_objset_sync(ds->ds_objset, zio, tx);
1638
1639 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) {
1640 if (ds->ds_feature_activation_needed[f]) {
1641 if (ds->ds_feature_inuse[f])
1642 continue;
1643 dsl_dataset_activate_feature(ds->ds_object, f, tx);
1644 ds->ds_feature_inuse[f] = B_TRUE;
1645 }
1646 }
1647 }
1648
1649 static void
1650 get_clones_stat(dsl_dataset_t *ds, nvlist_t *nv)
1651 {
1652 uint64_t count = 0;
1653 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
1654 zap_cursor_t zc;
1655 zap_attribute_t za;
1656 nvlist_t *propval = fnvlist_alloc();
1657 nvlist_t *val = fnvlist_alloc();
1658
1659 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool));
1660
1661 /*
1662 * There may be missing entries in ds_next_clones_obj
1663 * due to a bug in a previous version of the code.
1664 * Only trust it if it has the right number of entries.
1665 */
1666 if (dsl_dataset_phys(ds)->ds_next_clones_obj != 0) {
1667 VERIFY0(zap_count(mos, dsl_dataset_phys(ds)->ds_next_clones_obj,
1668 &count));
1669 }
1670 if (count != dsl_dataset_phys(ds)->ds_num_children - 1)
1671 goto fail;
1672 for (zap_cursor_init(&zc, mos,
1673 dsl_dataset_phys(ds)->ds_next_clones_obj);
1674 zap_cursor_retrieve(&zc, &za) == 0;
1675 zap_cursor_advance(&zc)) {
1676 dsl_dataset_t *clone;
1677 char buf[ZFS_MAX_DATASET_NAME_LEN];
1678 VERIFY0(dsl_dataset_hold_obj(ds->ds_dir->dd_pool,
1679 za.za_first_integer, FTAG, &clone));
1680 dsl_dir_name(clone->ds_dir, buf);
1681 fnvlist_add_boolean(val, buf);
1682 dsl_dataset_rele(clone, FTAG);
1683 }
1684 zap_cursor_fini(&zc);
1685 fnvlist_add_nvlist(propval, ZPROP_VALUE, val);
1686 fnvlist_add_nvlist(nv, zfs_prop_to_name(ZFS_PROP_CLONES), propval);
1687 fail:
1688 nvlist_free(val);
1689 nvlist_free(propval);
1690 }
1691
1692 static void
1693 get_receive_resume_stats(dsl_dataset_t *ds, nvlist_t *nv)
1694 {
1695 dsl_pool_t *dp = ds->ds_dir->dd_pool;
1696
1697 if (dsl_dataset_has_resume_receive_state(ds)) {
1698 char *str;
1699 void *packed;
1700 uint8_t *compressed;
1701 uint64_t val;
1702 nvlist_t *token_nv = fnvlist_alloc();
1703 size_t packed_size, compressed_size;
1704
1705 if (zap_lookup(dp->dp_meta_objset, ds->ds_object,
1706 DS_FIELD_RESUME_FROMGUID, sizeof (val), 1, &val) == 0) {
1707 fnvlist_add_uint64(token_nv, "fromguid", val);
1708 }
1709 if (zap_lookup(dp->dp_meta_objset, ds->ds_object,
1710 DS_FIELD_RESUME_OBJECT, sizeof (val), 1, &val) == 0) {
1711 fnvlist_add_uint64(token_nv, "object", val);
1712 }
1713 if (zap_lookup(dp->dp_meta_objset, ds->ds_object,
1714 DS_FIELD_RESUME_OFFSET, sizeof (val), 1, &val) == 0) {
1715 fnvlist_add_uint64(token_nv, "offset", val);
1716 }
1717 if (zap_lookup(dp->dp_meta_objset, ds->ds_object,
1718 DS_FIELD_RESUME_BYTES, sizeof (val), 1, &val) == 0) {
1719 fnvlist_add_uint64(token_nv, "bytes", val);
1720 }
1721 if (zap_lookup(dp->dp_meta_objset, ds->ds_object,
1722 DS_FIELD_RESUME_TOGUID, sizeof (val), 1, &val) == 0) {
1723 fnvlist_add_uint64(token_nv, "toguid", val);
1724 }
1725 char buf[256];
1726 if (zap_lookup(dp->dp_meta_objset, ds->ds_object,
1727 DS_FIELD_RESUME_TONAME, 1, sizeof (buf), buf) == 0) {
1728 fnvlist_add_string(token_nv, "toname", buf);
1729 }
1730 if (zap_contains(dp->dp_meta_objset, ds->ds_object,
1731 DS_FIELD_RESUME_EMBEDOK) == 0) {
1732 fnvlist_add_boolean(token_nv, "embedok");
1733 }
1734 packed = fnvlist_pack(token_nv, &packed_size);
1735 fnvlist_free(token_nv);
1736 compressed = kmem_alloc(packed_size, KM_SLEEP);
1737
1738 compressed_size = gzip_compress(packed, compressed,
1739 packed_size, packed_size, 6);
1740
1741 zio_cksum_t cksum;
1742 fletcher_4_native(compressed, compressed_size, NULL, &cksum);
1743
1744 str = kmem_alloc(compressed_size * 2 + 1, KM_SLEEP);
1745 for (int i = 0; i < compressed_size; i++) {
1746 (void) sprintf(str + i * 2, "%02x", compressed[i]);
1747 }
1748 str[compressed_size * 2] = '\0';
1749 char *propval = kmem_asprintf("%u-%llx-%llx-%s",
1750 ZFS_SEND_RESUME_TOKEN_VERSION,
1751 (longlong_t)cksum.zc_word[0],
1752 (longlong_t)packed_size, str);
1753 dsl_prop_nvlist_add_string(nv,
1754 ZFS_PROP_RECEIVE_RESUME_TOKEN, propval);
1755 kmem_free(packed, packed_size);
1756 kmem_free(str, compressed_size * 2 + 1);
1757 kmem_free(compressed, packed_size);
1758 strfree(propval);
1759 }
1760 }
1761
1762 void
1763 dsl_dataset_stats(dsl_dataset_t *ds, nvlist_t *nv)
1764 {
1765 dsl_pool_t *dp = ds->ds_dir->dd_pool;
1766 uint64_t refd, avail, uobjs, aobjs, ratio;
1767
1768 ASSERT(dsl_pool_config_held(dp));
1769
1770 ratio = dsl_dataset_phys(ds)->ds_compressed_bytes == 0 ? 100 :
1771 (dsl_dataset_phys(ds)->ds_uncompressed_bytes * 100 /
1772 dsl_dataset_phys(ds)->ds_compressed_bytes);
1773
1774 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRATIO, ratio);
1775 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_LOGICALREFERENCED,
1776 dsl_dataset_phys(ds)->ds_uncompressed_bytes);
1777
1778 if (ds->ds_is_snapshot) {
1779 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_COMPRESSRATIO, ratio);
1780 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USED,
1781 dsl_dataset_phys(ds)->ds_unique_bytes);
1782 get_clones_stat(ds, nv);
1783 } else {
1784 if (ds->ds_prev != NULL && ds->ds_prev != dp->dp_origin_snap) {
1785 char buf[ZFS_MAX_DATASET_NAME_LEN];
1786 dsl_dataset_name(ds->ds_prev, buf);
1787 dsl_prop_nvlist_add_string(nv, ZFS_PROP_PREV_SNAP, buf);
1788 }
1789
1790 dsl_dir_stats(ds->ds_dir, nv);
1791 }
1792
1793 dsl_dataset_space(ds, &refd, &avail, &uobjs, &aobjs);
1794 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_AVAILABLE, avail);
1795 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFERENCED, refd);
1796
1797 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATION,
1798 dsl_dataset_phys(ds)->ds_creation_time);
1799 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATETXG,
1800 dsl_dataset_phys(ds)->ds_creation_txg);
1801 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFQUOTA,
1802 ds->ds_quota);
1803 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRESERVATION,
1804 ds->ds_reserved);
1805 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_GUID,
1806 dsl_dataset_phys(ds)->ds_guid);
1807 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_UNIQUE,
1808 dsl_dataset_phys(ds)->ds_unique_bytes);
1809 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_OBJSETID,
1810 ds->ds_object);
1811 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USERREFS,
1812 ds->ds_userrefs);
1813 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_DEFER_DESTROY,
1814 DS_IS_DEFER_DESTROY(ds) ? 1 : 0);
1815
1816 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) {
1817 uint64_t written, comp, uncomp;
1818 dsl_pool_t *dp = ds->ds_dir->dd_pool;
1819 dsl_dataset_t *prev;
1820
1821 int err = dsl_dataset_hold_obj(dp,
1822 dsl_dataset_phys(ds)->ds_prev_snap_obj, FTAG, &prev);
1823 if (err == 0) {
1824 err = dsl_dataset_space_written(prev, ds, &written,
1825 &comp, &uncomp);
1826 dsl_dataset_rele(prev, FTAG);
1827 if (err == 0) {
1828 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_WRITTEN,
1829 written);
1830 }
1831 }
1832 }
1833
1834 if (!dsl_dataset_is_snapshot(ds)) {
1835 /*
1836 * A failed "newfs" (e.g. full) resumable receive leaves
1837 * the stats set on this dataset. Check here for the prop.
1838 */
1839 get_receive_resume_stats(ds, nv);
1840
1841 /*
1842 * A failed incremental resumable receive leaves the
1843 * stats set on our child named "%recv". Check the child
1844 * for the prop.
1845 */
1846 /* 6 extra bytes for /%recv */
1847 char recvname[ZFS_MAX_DATASET_NAME_LEN + 6];
1848 dsl_dataset_t *recv_ds;
1849 dsl_dataset_name(ds, recvname);
1850 if (strlcat(recvname, "/", sizeof (recvname)) <
1851 sizeof (recvname) &&
1852 strlcat(recvname, recv_clone_name, sizeof (recvname)) <
1853 sizeof (recvname) &&
1854 dsl_dataset_hold(dp, recvname, FTAG, &recv_ds) == 0) {
1855 get_receive_resume_stats(recv_ds, nv);
1856 dsl_dataset_rele(recv_ds, FTAG);
1857 }
1858 }
1859 }
1860
1861 void
1862 dsl_dataset_fast_stat(dsl_dataset_t *ds, dmu_objset_stats_t *stat)
1863 {
1864 dsl_pool_t *dp = ds->ds_dir->dd_pool;
1865 ASSERT(dsl_pool_config_held(dp));
1866
1867 stat->dds_creation_txg = dsl_dataset_phys(ds)->ds_creation_txg;
1868 stat->dds_inconsistent =
1869 dsl_dataset_phys(ds)->ds_flags & DS_FLAG_INCONSISTENT;
1870 stat->dds_guid = dsl_dataset_phys(ds)->ds_guid;
1871 stat->dds_origin[0] = '\0';
1872 if (ds->ds_is_snapshot) {
1873 stat->dds_is_snapshot = B_TRUE;
1874 stat->dds_num_clones =
1875 dsl_dataset_phys(ds)->ds_num_children - 1;
1876 } else {
1877 stat->dds_is_snapshot = B_FALSE;
1878 stat->dds_num_clones = 0;
1879
1880 if (dsl_dir_is_clone(ds->ds_dir)) {
1881 dsl_dataset_t *ods;
1882
1883 VERIFY0(dsl_dataset_hold_obj(dp,
1884 dsl_dir_phys(ds->ds_dir)->dd_origin_obj,
1885 FTAG, &ods));
1886 dsl_dataset_name(ods, stat->dds_origin);
1887 dsl_dataset_rele(ods, FTAG);
1888 }
1889 }
1890 }
1891
1892 uint64_t
1893 dsl_dataset_fsid_guid(dsl_dataset_t *ds)
1894 {
1895 return (ds->ds_fsid_guid);
1896 }
1897
1898 void
1899 dsl_dataset_space(dsl_dataset_t *ds,
1900 uint64_t *refdbytesp, uint64_t *availbytesp,
1901 uint64_t *usedobjsp, uint64_t *availobjsp)
1902 {
1903 *refdbytesp = dsl_dataset_phys(ds)->ds_referenced_bytes;
1904 *availbytesp = dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE);
1905 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes)
1906 *availbytesp +=
1907 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes;
1908 if (ds->ds_quota != 0) {
1909 /*
1910 * Adjust available bytes according to refquota
1911 */
1912 if (*refdbytesp < ds->ds_quota)
1913 *availbytesp = MIN(*availbytesp,
1914 ds->ds_quota - *refdbytesp);
1915 else
1916 *availbytesp = 0;
1917 }
1918 *usedobjsp = BP_GET_FILL(&dsl_dataset_phys(ds)->ds_bp);
1919 *availobjsp = DN_MAX_OBJECT - *usedobjsp;
1920 }
1921
1922 boolean_t
1923 dsl_dataset_modified_since_snap(dsl_dataset_t *ds, dsl_dataset_t *snap)
1924 {
1925 dsl_pool_t *dp = ds->ds_dir->dd_pool;
1926
1927 ASSERT(dsl_pool_config_held(dp));
1928 if (snap == NULL)
1929 return (B_FALSE);
1930 if (dsl_dataset_phys(ds)->ds_bp.blk_birth >
1931 dsl_dataset_phys(snap)->ds_creation_txg) {
1932 objset_t *os, *os_snap;
1933 /*
1934 * It may be that only the ZIL differs, because it was
1935 * reset in the head. Don't count that as being
1936 * modified.
1937 */
1938 if (dmu_objset_from_ds(ds, &os) != 0)
1939 return (B_TRUE);
1940 if (dmu_objset_from_ds(snap, &os_snap) != 0)
1941 return (B_TRUE);
1942 return (bcmp(&os->os_phys->os_meta_dnode,
1943 &os_snap->os_phys->os_meta_dnode,
1944 sizeof (os->os_phys->os_meta_dnode)) != 0);
1945 }
1946 return (B_FALSE);
1947 }
1948
1949 typedef struct dsl_dataset_rename_snapshot_arg {
1950 const char *ddrsa_fsname;
1951 const char *ddrsa_oldsnapname;
1952 const char *ddrsa_newsnapname;
1953 boolean_t ddrsa_recursive;
1954 dmu_tx_t *ddrsa_tx;
1955 } dsl_dataset_rename_snapshot_arg_t;
1956
1957 /* ARGSUSED */
1958 static int
1959 dsl_dataset_rename_snapshot_check_impl(dsl_pool_t *dp,
1960 dsl_dataset_t *hds, void *arg)
1961 {
1962 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg;
1963 int error;
1964 uint64_t val;
1965
1966 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val);
1967 if (error != 0) {
1968 /* ignore nonexistent snapshots */
1969 return (error == ENOENT ? 0 : error);
1970 }
1971
1972 /* new name should not exist */
1973 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_newsnapname, &val);
1974 if (error == 0)
1975 error = SET_ERROR(EEXIST);
1976 else if (error == ENOENT)
1977 error = 0;
1978
1979 /* dataset name + 1 for the "@" + the new snapshot name must fit */
1980 if (dsl_dir_namelen(hds->ds_dir) + 1 +
1981 strlen(ddrsa->ddrsa_newsnapname) >= ZFS_MAX_DATASET_NAME_LEN)
1982 error = SET_ERROR(ENAMETOOLONG);
1983
1984 return (error);
1985 }
1986
1987 static int
1988 dsl_dataset_rename_snapshot_check(void *arg, dmu_tx_t *tx)
1989 {
1990 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg;
1991 dsl_pool_t *dp = dmu_tx_pool(tx);
1992 dsl_dataset_t *hds;
1993 int error;
1994
1995 error = dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds);
1996 if (error != 0)
1997 return (error);
1998
1999 if (ddrsa->ddrsa_recursive) {
2000 error = dmu_objset_find_dp(dp, hds->ds_dir->dd_object,
2001 dsl_dataset_rename_snapshot_check_impl, ddrsa,
2002 DS_FIND_CHILDREN);
2003 } else {
2004 error = dsl_dataset_rename_snapshot_check_impl(dp, hds, ddrsa);
2005 }
2006 dsl_dataset_rele(hds, FTAG);
2007 return (error);
2008 }
2009
2010 static int
2011 dsl_dataset_rename_snapshot_sync_impl(dsl_pool_t *dp,
2012 dsl_dataset_t *hds, void *arg)
2013 {
2014 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg;
2015 dsl_dataset_t *ds;
2016 uint64_t val;
2017 dmu_tx_t *tx = ddrsa->ddrsa_tx;
2018 int error;
2019
2020 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val);
2021 ASSERT(error == 0 || error == ENOENT);
2022 if (error == ENOENT) {
2023 /* ignore nonexistent snapshots */
2024 return (0);
2025 }
2026
2027 VERIFY0(dsl_dataset_hold_obj(dp, val, FTAG, &ds));
2028
2029 /* log before we change the name */
2030 spa_history_log_internal_ds(ds, "rename", tx,
2031 "-> @%s", ddrsa->ddrsa_newsnapname);
2032
2033 VERIFY0(dsl_dataset_snap_remove(hds, ddrsa->ddrsa_oldsnapname, tx,
2034 B_FALSE));
2035 mutex_enter(&ds->ds_lock);
2036 (void) strcpy(ds->ds_snapname, ddrsa->ddrsa_newsnapname);
2037 mutex_exit(&ds->ds_lock);
2038 VERIFY0(zap_add(dp->dp_meta_objset,
2039 dsl_dataset_phys(hds)->ds_snapnames_zapobj,
2040 ds->ds_snapname, 8, 1, &ds->ds_object, tx));
2041
2042 dsl_dataset_rele(ds, FTAG);
2043 return (0);
2044 }
2045
2046 static void
2047 dsl_dataset_rename_snapshot_sync(void *arg, dmu_tx_t *tx)
2048 {
2049 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg;
2050 dsl_pool_t *dp = dmu_tx_pool(tx);
2051 dsl_dataset_t *hds;
2052
2053 VERIFY0(dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds));
2054 ddrsa->ddrsa_tx = tx;
2055 if (ddrsa->ddrsa_recursive) {
2056 VERIFY0(dmu_objset_find_dp(dp, hds->ds_dir->dd_object,
2057 dsl_dataset_rename_snapshot_sync_impl, ddrsa,
2058 DS_FIND_CHILDREN));
2059 } else {
2060 VERIFY0(dsl_dataset_rename_snapshot_sync_impl(dp, hds, ddrsa));
2061 }
2062 dsl_dataset_rele(hds, FTAG);
2063 }
2064
2065 int
2066 dsl_dataset_rename_snapshot(const char *fsname,
2067 const char *oldsnapname, const char *newsnapname, boolean_t recursive)
2068 {
2069 dsl_dataset_rename_snapshot_arg_t ddrsa;
2070
2071 ddrsa.ddrsa_fsname = fsname;
2072 ddrsa.ddrsa_oldsnapname = oldsnapname;
2073 ddrsa.ddrsa_newsnapname = newsnapname;
2074 ddrsa.ddrsa_recursive = recursive;
2075
2076 return (dsl_sync_task(fsname, dsl_dataset_rename_snapshot_check,
2077 dsl_dataset_rename_snapshot_sync, &ddrsa,
2078 1, ZFS_SPACE_CHECK_RESERVED));
2079 }
2080
2081 /*
2082 * If we're doing an ownership handoff, we need to make sure that there is
2083 * only one long hold on the dataset. We're not allowed to change anything here
2084 * so we don't permanently release the long hold or regular hold here. We want
2085 * to do this only when syncing to avoid the dataset unexpectedly going away
2086 * when we release the long hold.
2087 */
2088 static int
2089 dsl_dataset_handoff_check(dsl_dataset_t *ds, void *owner, dmu_tx_t *tx)
2090 {
2091 boolean_t held;
2092
2093 if (!dmu_tx_is_syncing(tx))
2094 return (0);
2095
2096 if (owner != NULL) {
2097 VERIFY3P(ds->ds_owner, ==, owner);
2098 dsl_dataset_long_rele(ds, owner);
2099 }
2100
2101 held = dsl_dataset_long_held(ds);
2102
2103 if (owner != NULL)
2104 dsl_dataset_long_hold(ds, owner);
2105
2106 if (held)
2107 return (SET_ERROR(EBUSY));
2108
2109 return (0);
2110 }
2111
2112 typedef struct dsl_dataset_rollback_arg {
2113 const char *ddra_fsname;
2114 void *ddra_owner;
2115 nvlist_t *ddra_result;
2116 } dsl_dataset_rollback_arg_t;
2117
2118 static int
2119 dsl_dataset_rollback_check(void *arg, dmu_tx_t *tx)
2120 {
2121 dsl_dataset_rollback_arg_t *ddra = arg;
2122 dsl_pool_t *dp = dmu_tx_pool(tx);
2123 dsl_dataset_t *ds;
2124 int64_t unused_refres_delta;
2125 int error;
2126
2127 error = dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds);
2128 if (error != 0)
2129 return (error);
2130
2131 /* must not be a snapshot */
2132 if (ds->ds_is_snapshot) {
2133 dsl_dataset_rele(ds, FTAG);
2134 return (SET_ERROR(EINVAL));
2135 }
2136
2137 /* must have a most recent snapshot */
2138 if (dsl_dataset_phys(ds)->ds_prev_snap_txg < TXG_INITIAL) {
2139 dsl_dataset_rele(ds, FTAG);
2140 return (SET_ERROR(EINVAL));
2141 }
2142
2143 /* must not have any bookmarks after the most recent snapshot */
2144 nvlist_t *proprequest = fnvlist_alloc();
2145 fnvlist_add_boolean(proprequest, zfs_prop_to_name(ZFS_PROP_CREATETXG));
2146 nvlist_t *bookmarks = fnvlist_alloc();
2147 error = dsl_get_bookmarks_impl(ds, proprequest, bookmarks);
2148 fnvlist_free(proprequest);
2149 if (error != 0)
2150 return (error);
2151 for (nvpair_t *pair = nvlist_next_nvpair(bookmarks, NULL);
2152 pair != NULL; pair = nvlist_next_nvpair(bookmarks, pair)) {
2153 nvlist_t *valuenv =
2154 fnvlist_lookup_nvlist(fnvpair_value_nvlist(pair),
2155 zfs_prop_to_name(ZFS_PROP_CREATETXG));
2156 uint64_t createtxg = fnvlist_lookup_uint64(valuenv, "value");
2157 if (createtxg > dsl_dataset_phys(ds)->ds_prev_snap_txg) {
2158 fnvlist_free(bookmarks);
2159 dsl_dataset_rele(ds, FTAG);
2160 return (SET_ERROR(EEXIST));
2161 }
2162 }
2163 fnvlist_free(bookmarks);
2164
2165 error = dsl_dataset_handoff_check(ds, ddra->ddra_owner, tx);
2166 if (error != 0) {
2167 dsl_dataset_rele(ds, FTAG);
2168 return (error);
2169 }
2170
2171 /*
2172 * Check if the snap we are rolling back to uses more than
2173 * the refquota.
2174 */
2175 if (ds->ds_quota != 0 &&
2176 dsl_dataset_phys(ds->ds_prev)->ds_referenced_bytes > ds->ds_quota) {
2177 dsl_dataset_rele(ds, FTAG);
2178 return (SET_ERROR(EDQUOT));
2179 }
2180
2181 /*
2182 * When we do the clone swap, we will temporarily use more space
2183 * due to the refreservation (the head will no longer have any
2184 * unique space, so the entire amount of the refreservation will need
2185 * to be free). We will immediately destroy the clone, freeing
2186 * this space, but the freeing happens over many txg's.
2187 */
2188 unused_refres_delta = (int64_t)MIN(ds->ds_reserved,
2189 dsl_dataset_phys(ds)->ds_unique_bytes);
2190
2191 if (unused_refres_delta > 0 &&
2192 unused_refres_delta >
2193 dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE)) {
2194 dsl_dataset_rele(ds, FTAG);
2195 return (SET_ERROR(ENOSPC));
2196 }
2197
2198 dsl_dataset_rele(ds, FTAG);
2199 return (0);
2200 }
2201
2202 static void
2203 dsl_dataset_rollback_sync(void *arg, dmu_tx_t *tx)
2204 {
2205 dsl_dataset_rollback_arg_t *ddra = arg;
2206 dsl_pool_t *dp = dmu_tx_pool(tx);
2207 dsl_dataset_t *ds, *clone;
2208 uint64_t cloneobj;
2209 char namebuf[ZFS_MAX_DATASET_NAME_LEN];
2210
2211 VERIFY0(dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds));
2212
2213 dsl_dataset_name(ds->ds_prev, namebuf);
2214 fnvlist_add_string(ddra->ddra_result, "target", namebuf);
2215
2216 cloneobj = dsl_dataset_create_sync(ds->ds_dir, "%rollback",
2217 ds->ds_prev, DS_CREATE_FLAG_NODIRTY, kcred, tx);
2218
2219 VERIFY0(dsl_dataset_hold_obj(dp, cloneobj, FTAG, &clone));
2220
2221 dsl_dataset_clone_swap_sync_impl(clone, ds, tx);
2222 dsl_dataset_zero_zil(ds, tx);
2223
2224 dsl_destroy_head_sync_impl(clone, tx);
2225
2226 dsl_dataset_rele(clone, FTAG);
2227 dsl_dataset_rele(ds, FTAG);
2228 }
2229
2230 /*
2231 * Rolls back the given filesystem or volume to the most recent snapshot.
2232 * The name of the most recent snapshot will be returned under key "target"
2233 * in the result nvlist.
2234 *
2235 * If owner != NULL:
2236 * - The existing dataset MUST be owned by the specified owner at entry
2237 * - Upon return, dataset will still be held by the same owner, whether we
2238 * succeed or not.
2239 *
2240 * This mode is required any time the existing filesystem is mounted. See
2241 * notes above zfs_suspend_fs() for further details.
2242 */
2243 int
2244 dsl_dataset_rollback(const char *fsname, void *owner, nvlist_t *result)
2245 {
2246 dsl_dataset_rollback_arg_t ddra;
2247
2248 ddra.ddra_fsname = fsname;
2249 ddra.ddra_owner = owner;
2250 ddra.ddra_result = result;
2251
2252 return (dsl_sync_task(fsname, dsl_dataset_rollback_check,
2253 dsl_dataset_rollback_sync, &ddra,
2254 1, ZFS_SPACE_CHECK_RESERVED));
2255 }
2256
2257 struct promotenode {
2258 list_node_t link;
2259 dsl_dataset_t *ds;
2260 };
2261
2262 typedef struct dsl_dataset_promote_arg {
2263 const char *ddpa_clonename;
2264 dsl_dataset_t *ddpa_clone;
2265 list_t shared_snaps, origin_snaps, clone_snaps;
2266 dsl_dataset_t *origin_origin; /* origin of the origin */
2267 uint64_t used, comp, uncomp, unique, cloneusedsnap, originusedsnap;
2268 char *err_ds;
2269 cred_t *cr;
2270 } dsl_dataset_promote_arg_t;
2271
2272 static int snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep);
2273 static int promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp,
2274 void *tag);
2275 static void promote_rele(dsl_dataset_promote_arg_t *ddpa, void *tag);
2276
2277 static int
2278 dsl_dataset_promote_check(void *arg, dmu_tx_t *tx)
2279 {
2280 dsl_dataset_promote_arg_t *ddpa = arg;
2281 dsl_pool_t *dp = dmu_tx_pool(tx);
2282 dsl_dataset_t *hds;
2283 struct promotenode *snap;
2284 dsl_dataset_t *origin_ds;
2285 int err;
2286 uint64_t unused;
2287 uint64_t ss_mv_cnt;
2288 size_t max_snap_len;
2289
2290 err = promote_hold(ddpa, dp, FTAG);
2291 if (err != 0)
2292 return (err);
2293
2294 hds = ddpa->ddpa_clone;
2295 max_snap_len = MAXNAMELEN - strlen(ddpa->ddpa_clonename) - 1;
2296
2297 if (dsl_dataset_phys(hds)->ds_flags & DS_FLAG_NOPROMOTE) {
2298 promote_rele(ddpa, FTAG);
2299 return (SET_ERROR(EXDEV));
2300 }
2301
2302 /*
2303 * Compute and check the amount of space to transfer. Since this is
2304 * so expensive, don't do the preliminary check.
2305 */
2306 if (!dmu_tx_is_syncing(tx)) {
2307 promote_rele(ddpa, FTAG);
2308 return (0);
2309 }
2310
2311 snap = list_head(&ddpa->shared_snaps);
2312 origin_ds = snap->ds;
2313
2314 /* compute origin's new unique space */
2315 snap = list_tail(&ddpa->clone_snaps);
2316 ASSERT3U(dsl_dataset_phys(snap->ds)->ds_prev_snap_obj, ==,
2317 origin_ds->ds_object);
2318 dsl_deadlist_space_range(&snap->ds->ds_deadlist,
2319 dsl_dataset_phys(origin_ds)->ds_prev_snap_txg, UINT64_MAX,
2320 &ddpa->unique, &unused, &unused);
2321
2322 /*
2323 * Walk the snapshots that we are moving
2324 *
2325 * Compute space to transfer. Consider the incremental changes
2326 * to used by each snapshot:
2327 * (my used) = (prev's used) + (blocks born) - (blocks killed)
2328 * So each snapshot gave birth to:
2329 * (blocks born) = (my used) - (prev's used) + (blocks killed)
2330 * So a sequence would look like:
2331 * (uN - u(N-1) + kN) + ... + (u1 - u0 + k1) + (u0 - 0 + k0)
2332 * Which simplifies to:
2333 * uN + kN + kN-1 + ... + k1 + k0
2334 * Note however, if we stop before we reach the ORIGIN we get:
2335 * uN + kN + kN-1 + ... + kM - uM-1
2336 */
2337 ss_mv_cnt = 0;
2338 ddpa->used = dsl_dataset_phys(origin_ds)->ds_referenced_bytes;
2339 ddpa->comp = dsl_dataset_phys(origin_ds)->ds_compressed_bytes;
2340 ddpa->uncomp = dsl_dataset_phys(origin_ds)->ds_uncompressed_bytes;
2341 for (snap = list_head(&ddpa->shared_snaps); snap;
2342 snap = list_next(&ddpa->shared_snaps, snap)) {
2343 uint64_t val, dlused, dlcomp, dluncomp;
2344 dsl_dataset_t *ds = snap->ds;
2345
2346 ss_mv_cnt++;
2347
2348 /*
2349 * If there are long holds, we won't be able to evict
2350 * the objset.
2351 */
2352 if (dsl_dataset_long_held(ds)) {
2353 err = SET_ERROR(EBUSY);
2354 goto out;
2355 }
2356
2357 /* Check that the snapshot name does not conflict */
2358 VERIFY0(dsl_dataset_get_snapname(ds));
2359 if (strlen(ds->ds_snapname) >= max_snap_len) {
2360 err = SET_ERROR(ENAMETOOLONG);
2361 goto out;
2362 }
2363 err = dsl_dataset_snap_lookup(hds, ds->ds_snapname, &val);
2364 if (err == 0) {
2365 (void) strcpy(ddpa->err_ds, snap->ds->ds_snapname);
2366 err = SET_ERROR(EEXIST);
2367 goto out;
2368 }
2369 if (err != ENOENT)
2370 goto out;
2371
2372 /* The very first snapshot does not have a deadlist */
2373 if (dsl_dataset_phys(ds)->ds_prev_snap_obj == 0)
2374 continue;
2375
2376 dsl_deadlist_space(&ds->ds_deadlist,
2377 &dlused, &dlcomp, &dluncomp);
2378 ddpa->used += dlused;
2379 ddpa->comp += dlcomp;
2380 ddpa->uncomp += dluncomp;
2381 }
2382
2383 /*
2384 * If we are a clone of a clone then we never reached ORIGIN,
2385 * so we need to subtract out the clone origin's used space.
2386 */
2387 if (ddpa->origin_origin) {
2388 ddpa->used -=
2389 dsl_dataset_phys(ddpa->origin_origin)->ds_referenced_bytes;
2390 ddpa->comp -=
2391 dsl_dataset_phys(ddpa->origin_origin)->ds_compressed_bytes;
2392 ddpa->uncomp -=
2393 dsl_dataset_phys(ddpa->origin_origin)->
2394 ds_uncompressed_bytes;
2395 }
2396
2397 /* Check that there is enough space and limit headroom here */
2398 err = dsl_dir_transfer_possible(origin_ds->ds_dir, hds->ds_dir,
2399 0, ss_mv_cnt, ddpa->used, ddpa->cr);
2400 if (err != 0)
2401 goto out;
2402
2403 /*
2404 * Compute the amounts of space that will be used by snapshots
2405 * after the promotion (for both origin and clone). For each,
2406 * it is the amount of space that will be on all of their
2407 * deadlists (that was not born before their new origin).
2408 */
2409 if (dsl_dir_phys(hds->ds_dir)->dd_flags & DD_FLAG_USED_BREAKDOWN) {
2410 uint64_t space;
2411
2412 /*
2413 * Note, typically this will not be a clone of a clone,
2414 * so dd_origin_txg will be < TXG_INITIAL, so
2415 * these snaplist_space() -> dsl_deadlist_space_range()
2416 * calls will be fast because they do not have to
2417 * iterate over all bps.
2418 */
2419 snap = list_head(&ddpa->origin_snaps);
2420 err = snaplist_space(&ddpa->shared_snaps,
2421 snap->ds->ds_dir->dd_origin_txg, &ddpa->cloneusedsnap);
2422 if (err != 0)
2423 goto out;
2424
2425 err = snaplist_space(&ddpa->clone_snaps,
2426 snap->ds->ds_dir->dd_origin_txg, &space);
2427 if (err != 0)
2428 goto out;
2429 ddpa->cloneusedsnap += space;
2430 }
2431 if (dsl_dir_phys(origin_ds->ds_dir)->dd_flags &
2432 DD_FLAG_USED_BREAKDOWN) {
2433 err = snaplist_space(&ddpa->origin_snaps,
2434 dsl_dataset_phys(origin_ds)->ds_creation_txg,
2435 &ddpa->originusedsnap);
2436 if (err != 0)
2437 goto out;
2438 }
2439
2440 out:
2441 promote_rele(ddpa, FTAG);
2442 return (err);
2443 }
2444
2445 static void
2446 dsl_dataset_promote_sync(void *arg, dmu_tx_t *tx)
2447 {
2448 dsl_dataset_promote_arg_t *ddpa = arg;
2449 dsl_pool_t *dp = dmu_tx_pool(tx);
2450 dsl_dataset_t *hds;
2451 struct promotenode *snap;
2452 dsl_dataset_t *origin_ds;
2453 dsl_dataset_t *origin_head;
2454 dsl_dir_t *dd;
2455 dsl_dir_t *odd = NULL;
2456 uint64_t oldnext_obj;
2457 int64_t delta;
2458
2459 VERIFY0(promote_hold(ddpa, dp, FTAG));
2460 hds = ddpa->ddpa_clone;
2461
2462 ASSERT0(dsl_dataset_phys(hds)->ds_flags & DS_FLAG_NOPROMOTE);
2463
2464 snap = list_head(&ddpa->shared_snaps);
2465 origin_ds = snap->ds;
2466 dd = hds->ds_dir;
2467
2468 snap = list_head(&ddpa->origin_snaps);
2469 origin_head = snap->ds;
2470
2471 /*
2472 * We need to explicitly open odd, since origin_ds's dd will be
2473 * changing.
2474 */
2475 VERIFY0(dsl_dir_hold_obj(dp, origin_ds->ds_dir->dd_object,
2476 NULL, FTAG, &odd));
2477
2478 /* change origin's next snap */
2479 dmu_buf_will_dirty(origin_ds->ds_dbuf, tx);
2480 oldnext_obj = dsl_dataset_phys(origin_ds)->ds_next_snap_obj;
2481 snap = list_tail(&ddpa->clone_snaps);
2482 ASSERT3U(dsl_dataset_phys(snap->ds)->ds_prev_snap_obj, ==,
2483 origin_ds->ds_object);
2484 dsl_dataset_phys(origin_ds)->ds_next_snap_obj = snap->ds->ds_object;
2485
2486 /* change the origin's next clone */
2487 if (dsl_dataset_phys(origin_ds)->ds_next_clones_obj) {
2488 dsl_dataset_remove_from_next_clones(origin_ds,
2489 snap->ds->ds_object, tx);
2490 VERIFY0(zap_add_int(dp->dp_meta_objset,
2491 dsl_dataset_phys(origin_ds)->ds_next_clones_obj,
2492 oldnext_obj, tx));
2493 }
2494
2495 /* change origin */
2496 dmu_buf_will_dirty(dd->dd_dbuf, tx);
2497 ASSERT3U(dsl_dir_phys(dd)->dd_origin_obj, ==, origin_ds->ds_object);
2498 dsl_dir_phys(dd)->dd_origin_obj = dsl_dir_phys(odd)->dd_origin_obj;
2499 dd->dd_origin_txg = origin_head->ds_dir->dd_origin_txg;
2500 dmu_buf_will_dirty(odd->dd_dbuf, tx);
2501 dsl_dir_phys(odd)->dd_origin_obj = origin_ds->ds_object;
2502 origin_head->ds_dir->dd_origin_txg =
2503 dsl_dataset_phys(origin_ds)->ds_creation_txg;
2504
2505 /* change dd_clone entries */
2506 if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) {
2507 VERIFY0(zap_remove_int(dp->dp_meta_objset,
2508 dsl_dir_phys(odd)->dd_clones, hds->ds_object, tx));
2509 VERIFY0(zap_add_int(dp->dp_meta_objset,
2510 dsl_dir_phys(ddpa->origin_origin->ds_dir)->dd_clones,
2511 hds->ds_object, tx));
2512
2513 VERIFY0(zap_remove_int(dp->dp_meta_objset,
2514 dsl_dir_phys(ddpa->origin_origin->ds_dir)->dd_clones,
2515 origin_head->ds_object, tx));
2516 if (dsl_dir_phys(dd)->dd_clones == 0) {
2517 dsl_dir_phys(dd)->dd_clones =
2518 zap_create(dp->dp_meta_objset, DMU_OT_DSL_CLONES,
2519 DMU_OT_NONE, 0, tx);
2520 }
2521 VERIFY0(zap_add_int(dp->dp_meta_objset,
2522 dsl_dir_phys(dd)->dd_clones, origin_head->ds_object, tx));
2523 }
2524
2525 /* move snapshots to this dir */
2526 for (snap = list_head(&ddpa->shared_snaps); snap;
2527 snap = list_next(&ddpa->shared_snaps, snap)) {
2528 dsl_dataset_t *ds = snap->ds;
2529
2530 /*
2531 * Property callbacks are registered to a particular
2532 * dsl_dir. Since ours is changing, evict the objset
2533 * so that they will be unregistered from the old dsl_dir.
2534 */
2535 if (ds->ds_objset) {
2536 dmu_objset_evict(ds->ds_objset);
2537 ds->ds_objset = NULL;
2538 }
2539
2540 /* move snap name entry */
2541 VERIFY0(dsl_dataset_get_snapname(ds));
2542 VERIFY0(dsl_dataset_snap_remove(origin_head,
2543 ds->ds_snapname, tx, B_TRUE));
2544 VERIFY0(zap_add(dp->dp_meta_objset,
2545 dsl_dataset_phys(hds)->ds_snapnames_zapobj, ds->ds_snapname,
2546 8, 1, &ds->ds_object, tx));
2547 dsl_fs_ss_count_adjust(hds->ds_dir, 1,
2548 DD_FIELD_SNAPSHOT_COUNT, tx);
2549
2550 /* change containing dsl_dir */
2551 dmu_buf_will_dirty(ds->ds_dbuf, tx);
2552 ASSERT3U(dsl_dataset_phys(ds)->ds_dir_obj, ==, odd->dd_object);
2553 dsl_dataset_phys(ds)->ds_dir_obj = dd->dd_object;
2554 ASSERT3P(ds->ds_dir, ==, odd);
2555 dsl_dir_rele(ds->ds_dir, ds);
2556 VERIFY0(dsl_dir_hold_obj(dp, dd->dd_object,
2557 NULL, ds, &ds->ds_dir));
2558
2559 /* move any clone references */
2560 if (dsl_dataset_phys(ds)->ds_next_clones_obj &&
2561 spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) {
2562 zap_cursor_t zc;
2563 zap_attribute_t za;
2564
2565 for (zap_cursor_init(&zc, dp->dp_meta_objset,
2566 dsl_dataset_phys(ds)->ds_next_clones_obj);
2567 zap_cursor_retrieve(&zc, &za) == 0;
2568 zap_cursor_advance(&zc)) {
2569 dsl_dataset_t *cnds;
2570 uint64_t o;
2571
2572 if (za.za_first_integer == oldnext_obj) {
2573 /*
2574 * We've already moved the
2575 * origin's reference.
2576 */
2577 continue;
2578 }
2579
2580 VERIFY0(dsl_dataset_hold_obj(dp,
2581 za.za_first_integer, FTAG, &cnds));
2582 o = dsl_dir_phys(cnds->ds_dir)->
2583 dd_head_dataset_obj;
2584
2585 VERIFY0(zap_remove_int(dp->dp_meta_objset,
2586 dsl_dir_phys(odd)->dd_clones, o, tx));
2587 VERIFY0(zap_add_int(dp->dp_meta_objset,
2588 dsl_dir_phys(dd)->dd_clones, o, tx));
2589 dsl_dataset_rele(cnds, FTAG);
2590 }
2591 zap_cursor_fini(&zc);
2592 }
2593
2594 ASSERT(!dsl_prop_hascb(ds));
2595 }
2596
2597 /*
2598 * Change space accounting.
2599 * Note, pa->*usedsnap and dd_used_breakdown[SNAP] will either
2600 * both be valid, or both be 0 (resulting in delta == 0). This
2601 * is true for each of {clone,origin} independently.
2602 */
2603
2604 delta = ddpa->cloneusedsnap -
2605 dsl_dir_phys(dd)->dd_used_breakdown[DD_USED_SNAP];
2606 ASSERT3S(delta, >=, 0);
2607 ASSERT3U(ddpa->used, >=, delta);
2608 dsl_dir_diduse_space(dd, DD_USED_SNAP, delta, 0, 0, tx);
2609 dsl_dir_diduse_space(dd, DD_USED_HEAD,
2610 ddpa->used - delta, ddpa->comp, ddpa->uncomp, tx);
2611
2612 delta = ddpa->originusedsnap -
2613 dsl_dir_phys(odd)->dd_used_breakdown[DD_USED_SNAP];
2614 ASSERT3S(delta, <=, 0);
2615 ASSERT3U(ddpa->used, >=, -delta);
2616 dsl_dir_diduse_space(odd, DD_USED_SNAP, delta, 0, 0, tx);
2617 dsl_dir_diduse_space(odd, DD_USED_HEAD,
2618 -ddpa->used - delta, -ddpa->comp, -ddpa->uncomp, tx);
2619
2620 dsl_dataset_phys(origin_ds)->ds_unique_bytes = ddpa->unique;
2621
2622 /* log history record */
2623 spa_history_log_internal_ds(hds, "promote", tx, "");
2624
2625 dsl_dir_rele(odd, FTAG);
2626 promote_rele(ddpa, FTAG);
2627 }
2628
2629 /*
2630 * Make a list of dsl_dataset_t's for the snapshots between first_obj
2631 * (exclusive) and last_obj (inclusive). The list will be in reverse
2632 * order (last_obj will be the list_head()). If first_obj == 0, do all
2633 * snapshots back to this dataset's origin.
2634 */
2635 static int
2636 snaplist_make(dsl_pool_t *dp,
2637 uint64_t first_obj, uint64_t last_obj, list_t *l, void *tag)
2638 {
2639 uint64_t obj = last_obj;
2640
2641 list_create(l, sizeof (struct promotenode),
2642 offsetof(struct promotenode, link));
2643
2644 while (obj != first_obj) {
2645 dsl_dataset_t *ds;
2646 struct promotenode *snap;
2647 int err;
2648
2649 err = dsl_dataset_hold_obj(dp, obj, tag, &ds);
2650 ASSERT(err != ENOENT);
2651 if (err != 0)
2652 return (err);
2653
2654 if (first_obj == 0)
2655 first_obj = dsl_dir_phys(ds->ds_dir)->dd_origin_obj;
2656
2657 snap = kmem_alloc(sizeof (*snap), KM_SLEEP);
2658 snap->ds = ds;
2659 list_insert_tail(l, snap);
2660 obj = dsl_dataset_phys(ds)->ds_prev_snap_obj;
2661 }
2662
2663 return (0);
2664 }
2665
2666 static int
2667 snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep)
2668 {
2669 struct promotenode *snap;
2670
2671 *spacep = 0;
2672 for (snap = list_head(l); snap; snap = list_next(l, snap)) {
2673 uint64_t used, comp, uncomp;
2674 dsl_deadlist_space_range(&snap->ds->ds_deadlist,
2675 mintxg, UINT64_MAX, &used, &comp, &uncomp);
2676 *spacep += used;
2677 }
2678 return (0);
2679 }
2680
2681 static void
2682 snaplist_destroy(list_t *l, void *tag)
2683 {
2684 struct promotenode *snap;
2685
2686 if (l == NULL || !list_link_active(&l->list_head))
2687 return;
2688
2689 while ((snap = list_tail(l)) != NULL) {
2690 list_remove(l, snap);
2691 dsl_dataset_rele(snap->ds, tag);
2692 kmem_free(snap, sizeof (*snap));
2693 }
2694 list_destroy(l);
2695 }
2696
2697 static int
2698 promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp, void *tag)
2699 {
2700 int error;
2701 dsl_dir_t *dd;
2702 struct promotenode *snap;
2703
2704 error = dsl_dataset_hold(dp, ddpa->ddpa_clonename, tag,
2705 &ddpa->ddpa_clone);
2706 if (error != 0)
2707 return (error);
2708 dd = ddpa->ddpa_clone->ds_dir;
2709
2710 if (ddpa->ddpa_clone->ds_is_snapshot ||
2711 !dsl_dir_is_clone(dd)) {
2712 dsl_dataset_rele(ddpa->ddpa_clone, tag);
2713 return (SET_ERROR(EINVAL));
2714 }
2715
2716 error = snaplist_make(dp, 0, dsl_dir_phys(dd)->dd_origin_obj,
2717 &ddpa->shared_snaps, tag);
2718 if (error != 0)
2719 goto out;
2720
2721 error = snaplist_make(dp, 0, ddpa->ddpa_clone->ds_object,
2722 &ddpa->clone_snaps, tag);
2723 if (error != 0)
2724 goto out;
2725
2726 snap = list_head(&ddpa->shared_snaps);
2727 ASSERT3U(snap->ds->ds_object, ==, dsl_dir_phys(dd)->dd_origin_obj);
2728 error = snaplist_make(dp, dsl_dir_phys(dd)->dd_origin_obj,
2729 dsl_dir_phys(snap->ds->ds_dir)->dd_head_dataset_obj,
2730 &ddpa->origin_snaps, tag);
2731 if (error != 0)
2732 goto out;
2733
2734 if (dsl_dir_phys(snap->ds->ds_dir)->dd_origin_obj != 0) {
2735 error = dsl_dataset_hold_obj(dp,
2736 dsl_dir_phys(snap->ds->ds_dir)->dd_origin_obj,
2737 tag, &ddpa->origin_origin);
2738 if (error != 0)
2739 goto out;
2740 }
2741 out:
2742 if (error != 0)
2743 promote_rele(ddpa, tag);
2744 return (error);
2745 }
2746
2747 static void
2748 promote_rele(dsl_dataset_promote_arg_t *ddpa, void *tag)
2749 {
2750 snaplist_destroy(&ddpa->shared_snaps, tag);
2751 snaplist_destroy(&ddpa->clone_snaps, tag);
2752 snaplist_destroy(&ddpa->origin_snaps, tag);
2753 if (ddpa->origin_origin != NULL)
2754 dsl_dataset_rele(ddpa->origin_origin, tag);
2755 dsl_dataset_rele(ddpa->ddpa_clone, tag);
2756 }
2757
2758 /*
2759 * Promote a clone.
2760 *
2761 * If it fails due to a conflicting snapshot name, "conflsnap" will be filled
2762 * in with the name. (It must be at least ZFS_MAX_DATASET_NAME_LEN bytes long.)
2763 */
2764 int
2765 dsl_dataset_promote(const char *name, char *conflsnap)
2766 {
2767 dsl_dataset_promote_arg_t ddpa = { 0 };
2768 uint64_t numsnaps;
2769 int error;
2770 objset_t *os;
2771
2772 /*
2773 * We will modify space proportional to the number of
2774 * snapshots. Compute numsnaps.
2775 */
2776 error = dmu_objset_hold(name, FTAG, &os);
2777 if (error != 0)
2778 return (error);
2779 error = zap_count(dmu_objset_pool(os)->dp_meta_objset,
2780 dsl_dataset_phys(dmu_objset_ds(os))->ds_snapnames_zapobj,
2781 &numsnaps);
2782 dmu_objset_rele(os, FTAG);
2783 if (error != 0)
2784 return (error);
2785
2786 ddpa.ddpa_clonename = name;
2787 ddpa.err_ds = conflsnap;
2788 ddpa.cr = CRED();
2789
2790 return (dsl_sync_task(name, dsl_dataset_promote_check,
2791 dsl_dataset_promote_sync, &ddpa,
2792 2 + numsnaps, ZFS_SPACE_CHECK_RESERVED));
2793 }
2794
2795 int
2796 dsl_dataset_clone_swap_check_impl(dsl_dataset_t *clone,
2797 dsl_dataset_t *origin_head, boolean_t force, void *owner, dmu_tx_t *tx)
2798 {
2799 /*
2800 * "slack" factor for received datasets with refquota set on them.
2801 * See the bottom of this function for details on its use.
2802 */
2803 uint64_t refquota_slack = DMU_MAX_ACCESS * spa_asize_inflation;
2804 int64_t unused_refres_delta;
2805
2806 /* they should both be heads */
2807 if (clone->ds_is_snapshot ||
2808 origin_head->ds_is_snapshot)
2809 return (SET_ERROR(EINVAL));
2810
2811 /* if we are not forcing, the branch point should be just before them */
2812 if (!force && clone->ds_prev != origin_head->ds_prev)
2813 return (SET_ERROR(EINVAL));
2814
2815 /* clone should be the clone (unless they are unrelated) */
2816 if (clone->ds_prev != NULL &&
2817 clone->ds_prev != clone->ds_dir->dd_pool->dp_origin_snap &&
2818 origin_head->ds_dir != clone->ds_prev->ds_dir)
2819 return (SET_ERROR(EINVAL));
2820
2821 /* the clone should be a child of the origin */
2822 if (clone->ds_dir->dd_parent != origin_head->ds_dir)
2823 return (SET_ERROR(EINVAL));
2824
2825 /* origin_head shouldn't be modified unless 'force' */
2826 if (!force &&
2827 dsl_dataset_modified_since_snap(origin_head, origin_head->ds_prev))
2828 return (SET_ERROR(ETXTBSY));
2829
2830 /* origin_head should have no long holds (e.g. is not mounted) */
2831 if (dsl_dataset_handoff_check(origin_head, owner, tx))
2832 return (SET_ERROR(EBUSY));
2833
2834 /* check amount of any unconsumed refreservation */
2835 unused_refres_delta =
2836 (int64_t)MIN(origin_head->ds_reserved,
2837 dsl_dataset_phys(origin_head)->ds_unique_bytes) -
2838 (int64_t)MIN(origin_head->ds_reserved,
2839 dsl_dataset_phys(clone)->ds_unique_bytes);
2840
2841 if (unused_refres_delta > 0 &&
2842 unused_refres_delta >
2843 dsl_dir_space_available(origin_head->ds_dir, NULL, 0, TRUE))
2844 return (SET_ERROR(ENOSPC));
2845
2846 /*
2847 * The clone can't be too much over the head's refquota.
2848 *
2849 * To ensure that the entire refquota can be used, we allow one
2850 * transaction to exceed the the refquota. Therefore, this check
2851 * needs to also allow for the space referenced to be more than the
2852 * refquota. The maximum amount of space that one transaction can use
2853 * on disk is DMU_MAX_ACCESS * spa_asize_inflation. Allowing this
2854 * overage ensures that we are able to receive a filesystem that
2855 * exceeds the refquota on the source system.
2856 *
2857 * So that overage is the refquota_slack we use below.
2858 */
2859 if (origin_head->ds_quota != 0 &&
2860 dsl_dataset_phys(clone)->ds_referenced_bytes >
2861 origin_head->ds_quota + refquota_slack)
2862 return (SET_ERROR(EDQUOT));
2863
2864 return (0);
2865 }
2866
2867 void
2868 dsl_dataset_clone_swap_sync_impl(dsl_dataset_t *clone,
2869 dsl_dataset_t *origin_head, dmu_tx_t *tx)
2870 {
2871 dsl_pool_t *dp = dmu_tx_pool(tx);
2872 int64_t unused_refres_delta;
2873
2874 ASSERT(clone->ds_reserved == 0);
2875 /*
2876 * NOTE: On DEBUG kernels there could be a race between this and
2877 * the check function if spa_asize_inflation is adjusted...
2878 */
2879 ASSERT(origin_head->ds_quota == 0 ||
2880 dsl_dataset_phys(clone)->ds_unique_bytes <= origin_head->ds_quota +
2881 DMU_MAX_ACCESS * spa_asize_inflation);
2882 ASSERT3P(clone->ds_prev, ==, origin_head->ds_prev);
2883
2884 /*
2885 * Swap per-dataset feature flags.
2886 */
2887 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) {
2888 if (!(spa_feature_table[f].fi_flags &
2889 ZFEATURE_FLAG_PER_DATASET)) {
2890 ASSERT(!clone->ds_feature_inuse[f]);
2891 ASSERT(!origin_head->ds_feature_inuse[f]);
2892 continue;
2893 }
2894
2895 boolean_t clone_inuse = clone->ds_feature_inuse[f];
2896 boolean_t origin_head_inuse = origin_head->ds_feature_inuse[f];
2897
2898 if (clone_inuse) {
2899 dsl_dataset_deactivate_feature(clone->ds_object, f, tx);
2900 clone->ds_feature_inuse[f] = B_FALSE;
2901 }
2902 if (origin_head_inuse) {
2903 dsl_dataset_deactivate_feature(origin_head->ds_object,
2904 f, tx);
2905 origin_head->ds_feature_inuse[f] = B_FALSE;
2906 }
2907 if (clone_inuse) {
2908 dsl_dataset_activate_feature(origin_head->ds_object,
2909 f, tx);
2910 origin_head->ds_feature_inuse[f] = B_TRUE;
2911 }
2912 if (origin_head_inuse) {
2913 dsl_dataset_activate_feature(clone->ds_object, f, tx);
2914 clone->ds_feature_inuse[f] = B_TRUE;
2915 }
2916 }
2917
2918 dmu_buf_will_dirty(clone->ds_dbuf, tx);
2919 dmu_buf_will_dirty(origin_head->ds_dbuf, tx);
2920
2921 if (clone->ds_objset != NULL) {
2922 dmu_objset_evict(clone->ds_objset);
2923 clone->ds_objset = NULL;
2924 }
2925
2926 if (origin_head->ds_objset != NULL) {
2927 dmu_objset_evict(origin_head->ds_objset);
2928 origin_head->ds_objset = NULL;
2929 }
2930
2931 unused_refres_delta =
2932 (int64_t)MIN(origin_head->ds_reserved,
2933 dsl_dataset_phys(origin_head)->ds_unique_bytes) -
2934 (int64_t)MIN(origin_head->ds_reserved,
2935 dsl_dataset_phys(clone)->ds_unique_bytes);
2936
2937 /*
2938 * Reset origin's unique bytes, if it exists.
2939 */
2940 if (clone->ds_prev) {
2941 dsl_dataset_t *origin = clone->ds_prev;
2942 uint64_t comp, uncomp;
2943
2944 dmu_buf_will_dirty(origin->ds_dbuf, tx);
2945 dsl_deadlist_space_range(&clone->ds_deadlist,
2946 dsl_dataset_phys(origin)->ds_prev_snap_txg, UINT64_MAX,
2947 &dsl_dataset_phys(origin)->ds_unique_bytes, &comp, &uncomp);
2948 }
2949
2950 /* swap blkptrs */
2951 {
2952 blkptr_t tmp;
2953 tmp = dsl_dataset_phys(origin_head)->ds_bp;
2954 dsl_dataset_phys(origin_head)->ds_bp =
2955 dsl_dataset_phys(clone)->ds_bp;
2956 dsl_dataset_phys(clone)->ds_bp = tmp;
2957 }
2958
2959 /* set dd_*_bytes */
2960 {
2961 int64_t dused, dcomp, duncomp;
2962 uint64_t cdl_used, cdl_comp, cdl_uncomp;
2963 uint64_t odl_used, odl_comp, odl_uncomp;
2964
2965 ASSERT3U(dsl_dir_phys(clone->ds_dir)->
2966 dd_used_breakdown[DD_USED_SNAP], ==, 0);
2967
2968 dsl_deadlist_space(&clone->ds_deadlist,
2969 &cdl_used, &cdl_comp, &cdl_uncomp);
2970 dsl_deadlist_space(&origin_head->ds_deadlist,
2971 &odl_used, &odl_comp, &odl_uncomp);
2972
2973 dused = dsl_dataset_phys(clone)->ds_referenced_bytes +
2974 cdl_used -
2975 (dsl_dataset_phys(origin_head)->ds_referenced_bytes +
2976 odl_used);
2977 dcomp = dsl_dataset_phys(clone)->ds_compressed_bytes +
2978 cdl_comp -
2979 (dsl_dataset_phys(origin_head)->ds_compressed_bytes +
2980 odl_comp);
2981 duncomp = dsl_dataset_phys(clone)->ds_uncompressed_bytes +
2982 cdl_uncomp -
2983 (dsl_dataset_phys(origin_head)->ds_uncompressed_bytes +
2984 odl_uncomp);
2985
2986 dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_HEAD,
2987 dused, dcomp, duncomp, tx);
2988 dsl_dir_diduse_space(clone->ds_dir, DD_USED_HEAD,
2989 -dused, -dcomp, -duncomp, tx);
2990
2991 /*
2992 * The difference in the space used by snapshots is the
2993 * difference in snapshot space due to the head's
2994 * deadlist (since that's the only thing that's
2995 * changing that affects the snapused).
2996 */
2997 dsl_deadlist_space_range(&clone->ds_deadlist,
2998 origin_head->ds_dir->dd_origin_txg, UINT64_MAX,
2999 &cdl_used, &cdl_comp, &cdl_uncomp);
3000 dsl_deadlist_space_range(&origin_head->ds_deadlist,
3001 origin_head->ds_dir->dd_origin_txg, UINT64_MAX,
3002 &odl_used, &odl_comp, &odl_uncomp);
3003 dsl_dir_transfer_space(origin_head->ds_dir, cdl_used - odl_used,
3004 DD_USED_HEAD, DD_USED_SNAP, tx);
3005 }
3006
3007 /* swap ds_*_bytes */
3008 SWITCH64(dsl_dataset_phys(origin_head)->ds_referenced_bytes,
3009 dsl_dataset_phys(clone)->ds_referenced_bytes);
3010 SWITCH64(dsl_dataset_phys(origin_head)->ds_compressed_bytes,
3011 dsl_dataset_phys(clone)->ds_compressed_bytes);
3012 SWITCH64(dsl_dataset_phys(origin_head)->ds_uncompressed_bytes,
3013 dsl_dataset_phys(clone)->ds_uncompressed_bytes);
3014 SWITCH64(dsl_dataset_phys(origin_head)->ds_unique_bytes,
3015 dsl_dataset_phys(clone)->ds_unique_bytes);
3016
3017 /* apply any parent delta for change in unconsumed refreservation */
3018 dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_REFRSRV,
3019 unused_refres_delta, 0, 0, tx);
3020
3021 /*
3022 * Swap deadlists.
3023 */
3024 dsl_deadlist_close(&clone->ds_deadlist);
3025 dsl_deadlist_close(&origin_head->ds_deadlist);
3026 SWITCH64(dsl_dataset_phys(origin_head)->ds_deadlist_obj,
3027 dsl_dataset_phys(clone)->ds_deadlist_obj);
3028 dsl_deadlist_open(&clone->ds_deadlist, dp->dp_meta_objset,
3029 dsl_dataset_phys(clone)->ds_deadlist_obj);
3030 dsl_deadlist_open(&origin_head->ds_deadlist, dp->dp_meta_objset,
3031 dsl_dataset_phys(origin_head)->ds_deadlist_obj);
3032
3033 dsl_scan_ds_clone_swapped(origin_head, clone, tx);
3034
3035 spa_history_log_internal_ds(clone, "clone swap", tx,
3036 "parent=%s", origin_head->ds_dir->dd_myname);
3037 }
3038
3039 /*
3040 * Given a pool name and a dataset object number in that pool,
3041 * return the name of that dataset.
3042 */
3043 int
3044 dsl_dsobj_to_dsname(char *pname, uint64_t obj, char *buf)
3045 {
3046 dsl_pool_t *dp;
3047 dsl_dataset_t *ds;
3048 int error;
3049
3050 error = dsl_pool_hold(pname, FTAG, &dp);
3051 if (error != 0)
3052 return (error);
3053
3054 error = dsl_dataset_hold_obj(dp, obj, FTAG, &ds);
3055 if (error == 0) {
3056 dsl_dataset_name(ds, buf);
3057 dsl_dataset_rele(ds, FTAG);
3058 }
3059 dsl_pool_rele(dp, FTAG);
3060
3061 return (error);
3062 }
3063
3064 int
3065 dsl_dataset_check_quota(dsl_dataset_t *ds, boolean_t check_quota,
3066 uint64_t asize, uint64_t inflight, uint64_t *used, uint64_t *ref_rsrv)
3067 {
3068 int error = 0;
3069
3070 ASSERT3S(asize, >, 0);
3071
3072 /*
3073 * *ref_rsrv is the portion of asize that will come from any
3074 * unconsumed refreservation space.
3075 */
3076 *ref_rsrv = 0;
3077
3078 mutex_enter(&ds->ds_lock);
3079 /*
3080 * Make a space adjustment for reserved bytes.
3081 */
3082 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes) {
3083 ASSERT3U(*used, >=,
3084 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes);
3085 *used -=
3086 (ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes);
3087 *ref_rsrv =
3088 asize - MIN(asize, parent_delta(ds, asize + inflight));
3089 }
3090
3091 if (!check_quota || ds->ds_quota == 0) {
3092 mutex_exit(&ds->ds_lock);
3093 return (0);
3094 }
3095 /*
3096 * If they are requesting more space, and our current estimate
3097 * is over quota, they get to try again unless the actual
3098 * on-disk is over quota and there are no pending changes (which
3099 * may free up space for us).
3100 */
3101 if (dsl_dataset_phys(ds)->ds_referenced_bytes + inflight >=
3102 ds->ds_quota) {
3103 if (inflight > 0 ||
3104 dsl_dataset_phys(ds)->ds_referenced_bytes < ds->ds_quota)
3105 error = SET_ERROR(ERESTART);
3106 else
3107 error = SET_ERROR(EDQUOT);
3108 }
3109 mutex_exit(&ds->ds_lock);
3110
3111 return (error);
3112 }
3113
3114 typedef struct dsl_dataset_set_qr_arg {
3115 const char *ddsqra_name;
3116 zprop_source_t ddsqra_source;
3117 uint64_t ddsqra_value;
3118 } dsl_dataset_set_qr_arg_t;
3119
3120
3121 /* ARGSUSED */
3122 static int
3123 dsl_dataset_set_refquota_check(void *arg, dmu_tx_t *tx)
3124 {
3125 dsl_dataset_set_qr_arg_t *ddsqra = arg;
3126 dsl_pool_t *dp = dmu_tx_pool(tx);
3127 dsl_dataset_t *ds;
3128 int error;
3129 uint64_t newval;
3130
3131 if (spa_version(dp->dp_spa) < SPA_VERSION_REFQUOTA)
3132 return (SET_ERROR(ENOTSUP));
3133
3134 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds);
3135 if (error != 0)
3136 return (error);
3137
3138 if (ds->ds_is_snapshot) {
3139 dsl_dataset_rele(ds, FTAG);
3140 return (SET_ERROR(EINVAL));
3141 }
3142
3143 error = dsl_prop_predict(ds->ds_dir,
3144 zfs_prop_to_name(ZFS_PROP_REFQUOTA),
3145 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval);
3146 if (error != 0) {
3147 dsl_dataset_rele(ds, FTAG);
3148 return (error);
3149 }
3150
3151 if (newval == 0) {
3152 dsl_dataset_rele(ds, FTAG);
3153 return (0);
3154 }
3155
3156 if (newval < dsl_dataset_phys(ds)->ds_referenced_bytes ||
3157 newval < ds->ds_reserved) {
3158 dsl_dataset_rele(ds, FTAG);
3159 return (SET_ERROR(ENOSPC));
3160 }
3161
3162 dsl_dataset_rele(ds, FTAG);
3163 return (0);
3164 }
3165
3166 static void
3167 dsl_dataset_set_refquota_sync(void *arg, dmu_tx_t *tx)
3168 {
3169 dsl_dataset_set_qr_arg_t *ddsqra = arg;
3170 dsl_pool_t *dp = dmu_tx_pool(tx);
3171 dsl_dataset_t *ds;
3172 uint64_t newval;
3173
3174 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds));
3175
3176 dsl_prop_set_sync_impl(ds,
3177 zfs_prop_to_name(ZFS_PROP_REFQUOTA),
3178 ddsqra->ddsqra_source, sizeof (ddsqra->ddsqra_value), 1,
3179 &ddsqra->ddsqra_value, tx);
3180
3181 VERIFY0(dsl_prop_get_int_ds(ds,
3182 zfs_prop_to_name(ZFS_PROP_REFQUOTA), &newval));
3183
3184 if (ds->ds_quota != newval) {
3185 dmu_buf_will_dirty(ds->ds_dbuf, tx);
3186 ds->ds_quota = newval;
3187 }
3188 dsl_dataset_rele(ds, FTAG);
3189 }
3190
3191 int
3192 dsl_dataset_set_refquota(const char *dsname, zprop_source_t source,
3193 uint64_t refquota)
3194 {
3195 dsl_dataset_set_qr_arg_t ddsqra;
3196
3197 ddsqra.ddsqra_name = dsname;
3198 ddsqra.ddsqra_source = source;
3199 ddsqra.ddsqra_value = refquota;
3200
3201 return (dsl_sync_task(dsname, dsl_dataset_set_refquota_check,
3202 dsl_dataset_set_refquota_sync, &ddsqra, 0, ZFS_SPACE_CHECK_NONE));
3203 }
3204
3205 static int
3206 dsl_dataset_set_refreservation_check(void *arg, dmu_tx_t *tx)
3207 {
3208 dsl_dataset_set_qr_arg_t *ddsqra = arg;
3209 dsl_pool_t *dp = dmu_tx_pool(tx);
3210 dsl_dataset_t *ds;
3211 int error;
3212 uint64_t newval, unique;
3213
3214 if (spa_version(dp->dp_spa) < SPA_VERSION_REFRESERVATION)
3215 return (SET_ERROR(ENOTSUP));
3216
3217 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds);
3218 if (error != 0)
3219 return (error);
3220
3221 if (ds->ds_is_snapshot) {
3222 dsl_dataset_rele(ds, FTAG);
3223 return (SET_ERROR(EINVAL));
3224 }
3225
3226 error = dsl_prop_predict(ds->ds_dir,
3227 zfs_prop_to_name(ZFS_PROP_REFRESERVATION),
3228 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval);
3229 if (error != 0) {
3230 dsl_dataset_rele(ds, FTAG);
3231 return (error);
3232 }
3233
3234 /*
3235 * If we are doing the preliminary check in open context, the
3236 * space estimates may be inaccurate.
3237 */
3238 if (!dmu_tx_is_syncing(tx)) {
3239 dsl_dataset_rele(ds, FTAG);
3240 return (0);
3241 }
3242
3243 mutex_enter(&ds->ds_lock);
3244 if (!DS_UNIQUE_IS_ACCURATE(ds))
3245 dsl_dataset_recalc_head_uniq(ds);
3246 unique = dsl_dataset_phys(ds)->ds_unique_bytes;
3247 mutex_exit(&ds->ds_lock);
3248
3249 if (MAX(unique, newval) > MAX(unique, ds->ds_reserved)) {
3250 uint64_t delta = MAX(unique, newval) -
3251 MAX(unique, ds->ds_reserved);
3252
3253 if (delta >
3254 dsl_dir_space_available(ds->ds_dir, NULL, 0, B_TRUE) ||
3255 (ds->ds_quota > 0 && newval > ds->ds_quota)) {
3256 dsl_dataset_rele(ds, FTAG);
3257 return (SET_ERROR(ENOSPC));
3258 }
3259 }
3260
3261 dsl_dataset_rele(ds, FTAG);
3262 return (0);
3263 }
3264
3265 void
3266 dsl_dataset_set_refreservation_sync_impl(dsl_dataset_t *ds,
3267 zprop_source_t source, uint64_t value, dmu_tx_t *tx)
3268 {
3269 uint64_t newval;
3270 uint64_t unique;
3271 int64_t delta;
3272
3273 dsl_prop_set_sync_impl(ds, zfs_prop_to_name(ZFS_PROP_REFRESERVATION),
3274 source, sizeof (value), 1, &value, tx);
3275
3276 VERIFY0(dsl_prop_get_int_ds(ds,
3277 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), &newval));
3278
3279 dmu_buf_will_dirty(ds->ds_dbuf, tx);
3280 mutex_enter(&ds->ds_dir->dd_lock);
3281 mutex_enter(&ds->ds_lock);
3282 ASSERT(DS_UNIQUE_IS_ACCURATE(ds));
3283 unique = dsl_dataset_phys(ds)->ds_unique_bytes;
3284 delta = MAX(0, (int64_t)(newval - unique)) -
3285 MAX(0, (int64_t)(ds->ds_reserved - unique));
3286 ds->ds_reserved = newval;
3287 mutex_exit(&ds->ds_lock);
3288
3289 dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV, delta, 0, 0, tx);
3290 mutex_exit(&ds->ds_dir->dd_lock);
3291 }
3292
3293 static void
3294 dsl_dataset_set_refreservation_sync(void *arg, dmu_tx_t *tx)
3295 {
3296 dsl_dataset_set_qr_arg_t *ddsqra = arg;
3297 dsl_pool_t *dp = dmu_tx_pool(tx);
3298 dsl_dataset_t *ds;
3299
3300 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds));
3301 dsl_dataset_set_refreservation_sync_impl(ds,
3302 ddsqra->ddsqra_source, ddsqra->ddsqra_value, tx);
3303 dsl_dataset_rele(ds, FTAG);
3304 }
3305
3306 int
3307 dsl_dataset_set_refreservation(const char *dsname, zprop_source_t source,
3308 uint64_t refreservation)
3309 {
3310 dsl_dataset_set_qr_arg_t ddsqra;
3311
3312 ddsqra.ddsqra_name = dsname;
3313 ddsqra.ddsqra_source = source;
3314 ddsqra.ddsqra_value = refreservation;
3315
3316 return (dsl_sync_task(dsname, dsl_dataset_set_refreservation_check,
3317 dsl_dataset_set_refreservation_sync, &ddsqra,
3318 0, ZFS_SPACE_CHECK_NONE));
3319 }
3320
3321 /*
3322 * Return (in *usedp) the amount of space written in new that is not
3323 * present in oldsnap. New may be a snapshot or the head. Old must be
3324 * a snapshot before new, in new's filesystem (or its origin). If not then
3325 * fail and return EINVAL.
3326 *
3327 * The written space is calculated by considering two components: First, we
3328 * ignore any freed space, and calculate the written as new's used space
3329 * minus old's used space. Next, we add in the amount of space that was freed
3330 * between the two snapshots, thus reducing new's used space relative to old's.
3331 * Specifically, this is the space that was born before old->ds_creation_txg,
3332 * and freed before new (ie. on new's deadlist or a previous deadlist).
3333 *
3334 * space freed [---------------------]
3335 * snapshots ---O-------O--------O-------O------
3336 * oldsnap new
3337 */
3338 int
3339 dsl_dataset_space_written(dsl_dataset_t *oldsnap, dsl_dataset_t *new,
3340 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp)
3341 {
3342 int err = 0;
3343 uint64_t snapobj;
3344 dsl_pool_t *dp = new->ds_dir->dd_pool;
3345
3346 ASSERT(dsl_pool_config_held(dp));
3347
3348 *usedp = 0;
3349 *usedp += dsl_dataset_phys(new)->ds_referenced_bytes;
3350 *usedp -= dsl_dataset_phys(oldsnap)->ds_referenced_bytes;
3351
3352 *compp = 0;
3353 *compp += dsl_dataset_phys(new)->ds_compressed_bytes;
3354 *compp -= dsl_dataset_phys(oldsnap)->ds_compressed_bytes;
3355
3356 *uncompp = 0;
3357 *uncompp += dsl_dataset_phys(new)->ds_uncompressed_bytes;
3358 *uncompp -= dsl_dataset_phys(oldsnap)->ds_uncompressed_bytes;
3359
3360 snapobj = new->ds_object;
3361 while (snapobj != oldsnap->ds_object) {
3362 dsl_dataset_t *snap;
3363 uint64_t used, comp, uncomp;
3364
3365 if (snapobj == new->ds_object) {
3366 snap = new;
3367 } else {
3368 err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &snap);
3369 if (err != 0)
3370 break;
3371 }
3372
3373 if (dsl_dataset_phys(snap)->ds_prev_snap_txg ==
3374 dsl_dataset_phys(oldsnap)->ds_creation_txg) {
3375 /*
3376 * The blocks in the deadlist can not be born after
3377 * ds_prev_snap_txg, so get the whole deadlist space,
3378 * which is more efficient (especially for old-format
3379 * deadlists). Unfortunately the deadlist code
3380 * doesn't have enough information to make this
3381 * optimization itself.
3382 */
3383 dsl_deadlist_space(&snap->ds_deadlist,
3384 &used, &comp, &uncomp);
3385 } else {
3386 dsl_deadlist_space_range(&snap->ds_deadlist,
3387 0, dsl_dataset_phys(oldsnap)->ds_creation_txg,
3388 &used, &comp, &uncomp);
3389 }
3390 *usedp += used;
3391 *compp += comp;
3392 *uncompp += uncomp;
3393
3394 /*
3395 * If we get to the beginning of the chain of snapshots
3396 * (ds_prev_snap_obj == 0) before oldsnap, then oldsnap
3397 * was not a snapshot of/before new.
3398 */
3399 snapobj = dsl_dataset_phys(snap)->ds_prev_snap_obj;
3400 if (snap != new)
3401 dsl_dataset_rele(snap, FTAG);
3402 if (snapobj == 0) {
3403 err = SET_ERROR(EINVAL);
3404 break;
3405 }
3406
3407 }
3408 return (err);
3409 }
3410
3411 /*
3412 * Return (in *usedp) the amount of space that will be reclaimed if firstsnap,
3413 * lastsnap, and all snapshots in between are deleted.
3414 *
3415 * blocks that would be freed [---------------------------]
3416 * snapshots ---O-------O--------O-------O--------O
3417 * firstsnap lastsnap
3418 *
3419 * This is the set of blocks that were born after the snap before firstsnap,
3420 * (birth > firstsnap->prev_snap_txg) and died before the snap after the
3421 * last snap (ie, is on lastsnap->ds_next->ds_deadlist or an earlier deadlist).
3422 * We calculate this by iterating over the relevant deadlists (from the snap
3423 * after lastsnap, backward to the snap after firstsnap), summing up the
3424 * space on the deadlist that was born after the snap before firstsnap.
3425 */
3426 int
3427 dsl_dataset_space_wouldfree(dsl_dataset_t *firstsnap,
3428 dsl_dataset_t *lastsnap,
3429 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp)
3430 {
3431 int err = 0;
3432 uint64_t snapobj;
3433 dsl_pool_t *dp = firstsnap->ds_dir->dd_pool;
3434
3435 ASSERT(firstsnap->ds_is_snapshot);
3436 ASSERT(lastsnap->ds_is_snapshot);
3437
3438 /*
3439 * Check that the snapshots are in the same dsl_dir, and firstsnap
3440 * is before lastsnap.
3441 */
3442 if (firstsnap->ds_dir != lastsnap->ds_dir ||
3443 dsl_dataset_phys(firstsnap)->ds_creation_txg >
3444 dsl_dataset_phys(lastsnap)->ds_creation_txg)
3445 return (SET_ERROR(EINVAL));
3446
3447 *usedp = *compp = *uncompp = 0;
3448
3449 snapobj = dsl_dataset_phys(lastsnap)->ds_next_snap_obj;
3450 while (snapobj != firstsnap->ds_object) {
3451 dsl_dataset_t *ds;
3452 uint64_t used, comp, uncomp;
3453
3454 err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &ds);
3455 if (err != 0)
3456 break;
3457
3458 dsl_deadlist_space_range(&ds->ds_deadlist,
3459 dsl_dataset_phys(firstsnap)->ds_prev_snap_txg, UINT64_MAX,
3460 &used, &comp, &uncomp);
3461 *usedp += used;
3462 *compp += comp;
3463 *uncompp += uncomp;
3464
3465 snapobj = dsl_dataset_phys(ds)->ds_prev_snap_obj;
3466 ASSERT3U(snapobj, !=, 0);
3467 dsl_dataset_rele(ds, FTAG);
3468 }
3469 return (err);
3470 }
3471
3472 /*
3473 * Return TRUE if 'earlier' is an earlier snapshot in 'later's timeline.
3474 * For example, they could both be snapshots of the same filesystem, and
3475 * 'earlier' is before 'later'. Or 'earlier' could be the origin of
3476 * 'later's filesystem. Or 'earlier' could be an older snapshot in the origin's
3477 * filesystem. Or 'earlier' could be the origin's origin.
3478 *
3479 * If non-zero, earlier_txg is used instead of earlier's ds_creation_txg.
3480 */
3481 boolean_t
3482 dsl_dataset_is_before(dsl_dataset_t *later, dsl_dataset_t *earlier,
3483 uint64_t earlier_txg)
3484 {
3485 dsl_pool_t *dp = later->ds_dir->dd_pool;
3486 int error;
3487 boolean_t ret;
3488
3489 ASSERT(dsl_pool_config_held(dp));
3490 ASSERT(earlier->ds_is_snapshot || earlier_txg != 0);
3491
3492 if (earlier_txg == 0)
3493 earlier_txg = dsl_dataset_phys(earlier)->ds_creation_txg;
3494
3495 if (later->ds_is_snapshot &&
3496 earlier_txg >= dsl_dataset_phys(later)->ds_creation_txg)
3497 return (B_FALSE);
3498
3499 if (later->ds_dir == earlier->ds_dir)
3500 return (B_TRUE);
3501 if (!dsl_dir_is_clone(later->ds_dir))
3502 return (B_FALSE);
3503
3504 if (dsl_dir_phys(later->ds_dir)->dd_origin_obj == earlier->ds_object)
3505 return (B_TRUE);
3506 dsl_dataset_t *origin;
3507 error = dsl_dataset_hold_obj(dp,
3508 dsl_dir_phys(later->ds_dir)->dd_origin_obj, FTAG, &origin);
3509 if (error != 0)
3510 return (B_FALSE);
3511 ret = dsl_dataset_is_before(origin, earlier, earlier_txg);
3512 dsl_dataset_rele(origin, FTAG);
3513 return (ret);
3514 }
3515
3516 void
3517 dsl_dataset_zapify(dsl_dataset_t *ds, dmu_tx_t *tx)
3518 {
3519 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
3520 dmu_object_zapify(mos, ds->ds_object, DMU_OT_DSL_DATASET, tx);
3521 }
3522
3523 boolean_t
3524 dsl_dataset_is_zapified(dsl_dataset_t *ds)
3525 {
3526 dmu_object_info_t doi;
3527
3528 dmu_object_info_from_db(ds->ds_dbuf, &doi);
3529 return (doi.doi_type == DMU_OTN_ZAP_METADATA);
3530 }
3531
3532 boolean_t
3533 dsl_dataset_has_resume_receive_state(dsl_dataset_t *ds)
3534 {
3535 return (dsl_dataset_is_zapified(ds) &&
3536 zap_contains(ds->ds_dir->dd_pool->dp_meta_objset,
3537 ds->ds_object, DS_FIELD_RESUME_TOGUID) == 0);
3538 }
Unleashed OS