1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21 /*
22 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
23 * Portions Copyright (c) 2011 Martin Matuska <mm@FreeBSD.org>
24 * Copyright (c) 2011, 2015 by Delphix. All rights reserved.
25 * Copyright (c) 2014, Joyent, Inc. All rights reserved.
26 * Copyright (c) 2014 RackTop Systems.
27 * Copyright (c) 2014 Spectra Logic Corporation, All rights reserved.
28 */
29
30 #include <sys/dmu_objset.h>
31 #include <sys/dsl_dataset.h>
32 #include <sys/dsl_dir.h>
33 #include <sys/dsl_prop.h>
34 #include <sys/dsl_synctask.h>
35 #include <sys/dmu_traverse.h>
36 #include <sys/dmu_impl.h>
37 #include <sys/dmu_send.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 SYSCTL_DECL(_vfs_zfs);
61
62 /*
63 * The SPA supports block sizes up to 16MB. However, very large blocks
64 * can have an impact on i/o latency (e.g. tying up a spinning disk for
65 * ~300ms), and also potentially on the memory allocator. Therefore,
66 * we do not allow the recordsize to be set larger than zfs_max_recordsize
67 * (default 1MB). Larger blocks can be created by changing this tunable,
68 * and pools with larger blocks can always be imported and used, regardless
69 * of this setting.
70 */
71 int zfs_max_recordsize = 1 * 1024 * 1024;
72 SYSCTL_INT(_vfs_zfs, OID_AUTO, max_recordsize, CTLFLAG_RWTUN,
73 &zfs_max_recordsize, 0,
74 "Maximum block size. Expect dragons when tuning this.");
75
76 #define SWITCH64(x, y) \
77 { \
78 uint64_t __tmp = (x); \
79 (x) = (y); \
80 (y) = __tmp; \
81 }
82
83 #define DS_REF_MAX (1ULL << 62)
84
85 extern inline dsl_dataset_phys_t *dsl_dataset_phys(dsl_dataset_t *ds);
86
87 /*
88 * Figure out how much of this delta should be propogated to the dsl_dir
89 * layer. If there's a refreservation, that space has already been
90 * partially accounted for in our ancestors.
91 */
92 static int64_t
parent_delta(dsl_dataset_t * ds,int64_t delta)93 parent_delta(dsl_dataset_t *ds, int64_t delta)
94 {
95 dsl_dataset_phys_t *ds_phys;
96 uint64_t old_bytes, new_bytes;
97
98 if (ds->ds_reserved == 0)
99 return (delta);
100
101 ds_phys = dsl_dataset_phys(ds);
102 old_bytes = MAX(ds_phys->ds_unique_bytes, ds->ds_reserved);
103 new_bytes = MAX(ds_phys->ds_unique_bytes + delta, ds->ds_reserved);
104
105 ASSERT3U(ABS((int64_t)(new_bytes - old_bytes)), <=, ABS(delta));
106 return (new_bytes - old_bytes);
107 }
108
109 void
dsl_dataset_block_born(dsl_dataset_t * ds,const blkptr_t * bp,dmu_tx_t * tx)110 dsl_dataset_block_born(dsl_dataset_t *ds, const blkptr_t *bp, dmu_tx_t *tx)
111 {
112 int used = bp_get_dsize_sync(tx->tx_pool->dp_spa, bp);
113 int compressed = BP_GET_PSIZE(bp);
114 int uncompressed = BP_GET_UCSIZE(bp);
115 int64_t delta;
116
117 dprintf_bp(bp, "ds=%p", ds);
118
119 ASSERT(dmu_tx_is_syncing(tx));
120 /* It could have been compressed away to nothing */
121 if (BP_IS_HOLE(bp))
122 return;
123 ASSERT(BP_GET_TYPE(bp) != DMU_OT_NONE);
124 ASSERT(DMU_OT_IS_VALID(BP_GET_TYPE(bp)));
125 if (ds == NULL) {
126 dsl_pool_mos_diduse_space(tx->tx_pool,
127 used, compressed, uncompressed);
128 return;
129 }
130
131 dmu_buf_will_dirty(ds->ds_dbuf, tx);
132 mutex_enter(&ds->ds_lock);
133 delta = parent_delta(ds, used);
134 dsl_dataset_phys(ds)->ds_referenced_bytes += used;
135 dsl_dataset_phys(ds)->ds_compressed_bytes += compressed;
136 dsl_dataset_phys(ds)->ds_uncompressed_bytes += uncompressed;
137 dsl_dataset_phys(ds)->ds_unique_bytes += used;
138
139 if (BP_GET_LSIZE(bp) > SPA_OLD_MAXBLOCKSIZE) {
140 ds->ds_feature_activation_needed[SPA_FEATURE_LARGE_BLOCKS] =
141 B_TRUE;
142 }
143
144 spa_feature_t f = zio_checksum_to_feature(BP_GET_CHECKSUM(bp));
145 if (f != SPA_FEATURE_NONE)
146 ds->ds_feature_activation_needed[f] = B_TRUE;
147
148 mutex_exit(&ds->ds_lock);
149 dsl_dir_diduse_space(ds->ds_dir, DD_USED_HEAD, delta,
150 compressed, uncompressed, tx);
151 dsl_dir_transfer_space(ds->ds_dir, used - delta,
152 DD_USED_REFRSRV, DD_USED_HEAD, NULL);
153 }
154
155 int
dsl_dataset_block_kill(dsl_dataset_t * ds,const blkptr_t * bp,dmu_tx_t * tx,boolean_t async)156 dsl_dataset_block_kill(dsl_dataset_t *ds, const blkptr_t *bp, dmu_tx_t *tx,
157 boolean_t async)
158 {
159 int used = bp_get_dsize_sync(tx->tx_pool->dp_spa, bp);
160 int compressed = BP_GET_PSIZE(bp);
161 int uncompressed = BP_GET_UCSIZE(bp);
162
163 if (BP_IS_HOLE(bp))
164 return (0);
165
166 ASSERT(dmu_tx_is_syncing(tx));
167 ASSERT(bp->blk_birth <= tx->tx_txg);
168
169 if (ds == NULL) {
170 dsl_free(tx->tx_pool, tx->tx_txg, bp);
171 dsl_pool_mos_diduse_space(tx->tx_pool,
172 -used, -compressed, -uncompressed);
173 return (used);
174 }
175 ASSERT3P(tx->tx_pool, ==, ds->ds_dir->dd_pool);
176
177 ASSERT(!ds->ds_is_snapshot);
178 dmu_buf_will_dirty(ds->ds_dbuf, tx);
179
180 if (bp->blk_birth > dsl_dataset_phys(ds)->ds_prev_snap_txg) {
181 int64_t delta;
182
183 dprintf_bp(bp, "freeing ds=%llu", ds->ds_object);
184 dsl_free(tx->tx_pool, tx->tx_txg, bp);
185
186 mutex_enter(&ds->ds_lock);
187 ASSERT(dsl_dataset_phys(ds)->ds_unique_bytes >= used ||
188 !DS_UNIQUE_IS_ACCURATE(ds));
189 delta = parent_delta(ds, -used);
190 dsl_dataset_phys(ds)->ds_unique_bytes -= used;
191 mutex_exit(&ds->ds_lock);
192 dsl_dir_diduse_space(ds->ds_dir, DD_USED_HEAD,
193 delta, -compressed, -uncompressed, tx);
194 dsl_dir_transfer_space(ds->ds_dir, -used - delta,
195 DD_USED_REFRSRV, DD_USED_HEAD, NULL);
196 } else {
197 dprintf_bp(bp, "putting on dead list: %s", "");
198 if (async) {
199 /*
200 * We are here as part of zio's write done callback,
201 * which means we're a zio interrupt thread. We can't
202 * call dsl_deadlist_insert() now because it may block
203 * waiting for I/O. Instead, put bp on the deferred
204 * queue and let dsl_pool_sync() finish the job.
205 */
206 bplist_append(&ds->ds_pending_deadlist, bp);
207 } else {
208 dsl_deadlist_insert(&ds->ds_deadlist, bp, tx);
209 }
210 ASSERT3U(ds->ds_prev->ds_object, ==,
211 dsl_dataset_phys(ds)->ds_prev_snap_obj);
212 ASSERT(dsl_dataset_phys(ds->ds_prev)->ds_num_children > 0);
213 /* if (bp->blk_birth > prev prev snap txg) prev unique += bs */
214 if (dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj ==
215 ds->ds_object && bp->blk_birth >
216 dsl_dataset_phys(ds->ds_prev)->ds_prev_snap_txg) {
217 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx);
218 mutex_enter(&ds->ds_prev->ds_lock);
219 dsl_dataset_phys(ds->ds_prev)->ds_unique_bytes += used;
220 mutex_exit(&ds->ds_prev->ds_lock);
221 }
222 if (bp->blk_birth > ds->ds_dir->dd_origin_txg) {
223 dsl_dir_transfer_space(ds->ds_dir, used,
224 DD_USED_HEAD, DD_USED_SNAP, tx);
225 }
226 }
227 mutex_enter(&ds->ds_lock);
228 ASSERT3U(dsl_dataset_phys(ds)->ds_referenced_bytes, >=, used);
229 dsl_dataset_phys(ds)->ds_referenced_bytes -= used;
230 ASSERT3U(dsl_dataset_phys(ds)->ds_compressed_bytes, >=, compressed);
231 dsl_dataset_phys(ds)->ds_compressed_bytes -= compressed;
232 ASSERT3U(dsl_dataset_phys(ds)->ds_uncompressed_bytes, >=, uncompressed);
233 dsl_dataset_phys(ds)->ds_uncompressed_bytes -= uncompressed;
234 mutex_exit(&ds->ds_lock);
235
236 return (used);
237 }
238
239 uint64_t
dsl_dataset_prev_snap_txg(dsl_dataset_t * ds)240 dsl_dataset_prev_snap_txg(dsl_dataset_t *ds)
241 {
242 uint64_t trysnap = 0;
243
244 if (ds == NULL)
245 return (0);
246 /*
247 * The snapshot creation could fail, but that would cause an
248 * incorrect FALSE return, which would only result in an
249 * overestimation of the amount of space that an operation would
250 * consume, which is OK.
251 *
252 * There's also a small window where we could miss a pending
253 * snapshot, because we could set the sync task in the quiescing
254 * phase. So this should only be used as a guess.
255 */
256 if (ds->ds_trysnap_txg >
257 spa_last_synced_txg(ds->ds_dir->dd_pool->dp_spa))
258 trysnap = ds->ds_trysnap_txg;
259 return (MAX(dsl_dataset_phys(ds)->ds_prev_snap_txg, trysnap));
260 }
261
262 boolean_t
dsl_dataset_block_freeable(dsl_dataset_t * ds,const blkptr_t * bp,uint64_t blk_birth)263 dsl_dataset_block_freeable(dsl_dataset_t *ds, const blkptr_t *bp,
264 uint64_t blk_birth)
265 {
266 if (blk_birth <= dsl_dataset_prev_snap_txg(ds) ||
267 (bp != NULL && BP_IS_HOLE(bp)))
268 return (B_FALSE);
269
270 ddt_prefetch(dsl_dataset_get_spa(ds), bp);
271
272 return (B_TRUE);
273 }
274
275 static void
dsl_dataset_evict(void * dbu)276 dsl_dataset_evict(void *dbu)
277 {
278 dsl_dataset_t *ds = dbu;
279
280 ASSERT(ds->ds_owner == NULL);
281
282 ds->ds_dbuf = NULL;
283
284 unique_remove(ds->ds_fsid_guid);
285
286 if (ds->ds_objset != NULL)
287 dmu_objset_evict(ds->ds_objset);
288
289 if (ds->ds_prev) {
290 dsl_dataset_rele(ds->ds_prev, ds);
291 ds->ds_prev = NULL;
292 }
293
294 bplist_destroy(&ds->ds_pending_deadlist);
295 if (ds->ds_deadlist.dl_os != NULL)
296 dsl_deadlist_close(&ds->ds_deadlist);
297 if (ds->ds_dir)
298 dsl_dir_async_rele(ds->ds_dir, ds);
299
300 ASSERT(!list_link_active(&ds->ds_synced_link));
301
302 list_destroy(&ds->ds_prop_cbs);
303 if (mutex_owned(&ds->ds_lock))
304 mutex_exit(&ds->ds_lock);
305 mutex_destroy(&ds->ds_lock);
306 if (mutex_owned(&ds->ds_opening_lock))
307 mutex_exit(&ds->ds_opening_lock);
308 mutex_destroy(&ds->ds_opening_lock);
309 mutex_destroy(&ds->ds_sendstream_lock);
310 refcount_destroy(&ds->ds_longholds);
311
312 kmem_free(ds, sizeof (dsl_dataset_t));
313 }
314
315 int
dsl_dataset_get_snapname(dsl_dataset_t * ds)316 dsl_dataset_get_snapname(dsl_dataset_t *ds)
317 {
318 dsl_dataset_phys_t *headphys;
319 int err;
320 dmu_buf_t *headdbuf;
321 dsl_pool_t *dp = ds->ds_dir->dd_pool;
322 objset_t *mos = dp->dp_meta_objset;
323
324 if (ds->ds_snapname[0])
325 return (0);
326 if (dsl_dataset_phys(ds)->ds_next_snap_obj == 0)
327 return (0);
328
329 err = dmu_bonus_hold(mos, dsl_dir_phys(ds->ds_dir)->dd_head_dataset_obj,
330 FTAG, &headdbuf);
331 if (err != 0)
332 return (err);
333 headphys = headdbuf->db_data;
334 err = zap_value_search(dp->dp_meta_objset,
335 headphys->ds_snapnames_zapobj, ds->ds_object, 0, ds->ds_snapname);
336 dmu_buf_rele(headdbuf, FTAG);
337 return (err);
338 }
339
340 int
dsl_dataset_snap_lookup(dsl_dataset_t * ds,const char * name,uint64_t * value)341 dsl_dataset_snap_lookup(dsl_dataset_t *ds, const char *name, uint64_t *value)
342 {
343 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
344 uint64_t snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj;
345 matchtype_t mt;
346 int err;
347
348 if (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_CI_DATASET)
349 mt = MT_FIRST;
350 else
351 mt = MT_EXACT;
352
353 err = zap_lookup_norm(mos, snapobj, name, 8, 1,
354 value, mt, NULL, 0, NULL);
355 if (err == ENOTSUP && mt == MT_FIRST)
356 err = zap_lookup(mos, snapobj, name, 8, 1, value);
357 return (err);
358 }
359
360 int
dsl_dataset_snap_remove(dsl_dataset_t * ds,const char * name,dmu_tx_t * tx,boolean_t adj_cnt)361 dsl_dataset_snap_remove(dsl_dataset_t *ds, const char *name, dmu_tx_t *tx,
362 boolean_t adj_cnt)
363 {
364 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
365 uint64_t snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj;
366 matchtype_t mt;
367 int err;
368
369 dsl_dir_snap_cmtime_update(ds->ds_dir);
370
371 if (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_CI_DATASET)
372 mt = MT_FIRST;
373 else
374 mt = MT_EXACT;
375
376 err = zap_remove_norm(mos, snapobj, name, mt, tx);
377 if (err == ENOTSUP && mt == MT_FIRST)
378 err = zap_remove(mos, snapobj, name, tx);
379
380 if (err == 0 && adj_cnt)
381 dsl_fs_ss_count_adjust(ds->ds_dir, -1,
382 DD_FIELD_SNAPSHOT_COUNT, tx);
383
384 return (err);
385 }
386
387 boolean_t
dsl_dataset_try_add_ref(dsl_pool_t * dp,dsl_dataset_t * ds,void * tag)388 dsl_dataset_try_add_ref(dsl_pool_t *dp, dsl_dataset_t *ds, void *tag)
389 {
390 dmu_buf_t *dbuf = ds->ds_dbuf;
391 boolean_t result = B_FALSE;
392
393 if (dbuf != NULL && dmu_buf_try_add_ref(dbuf, dp->dp_meta_objset,
394 ds->ds_object, DMU_BONUS_BLKID, tag)) {
395
396 if (ds == dmu_buf_get_user(dbuf))
397 result = B_TRUE;
398 else
399 dmu_buf_rele(dbuf, tag);
400 }
401
402 return (result);
403 }
404
405 int
dsl_dataset_hold_obj(dsl_pool_t * dp,uint64_t dsobj,void * tag,dsl_dataset_t ** dsp)406 dsl_dataset_hold_obj(dsl_pool_t *dp, uint64_t dsobj, void *tag,
407 dsl_dataset_t **dsp)
408 {
409 objset_t *mos = dp->dp_meta_objset;
410 dmu_buf_t *dbuf;
411 dsl_dataset_t *ds;
412 int err;
413 dmu_object_info_t doi;
414
415 ASSERT(dsl_pool_config_held(dp));
416
417 err = dmu_bonus_hold(mos, dsobj, tag, &dbuf);
418 if (err != 0)
419 return (err);
420
421 /* Make sure dsobj has the correct object type. */
422 dmu_object_info_from_db(dbuf, &doi);
423 if (doi.doi_bonus_type != DMU_OT_DSL_DATASET) {
424 dmu_buf_rele(dbuf, tag);
425 return (SET_ERROR(EINVAL));
426 }
427
428 ds = dmu_buf_get_user(dbuf);
429 if (ds == NULL) {
430 dsl_dataset_t *winner = NULL;
431
432 ds = kmem_zalloc(sizeof (dsl_dataset_t), KM_SLEEP);
433 ds->ds_dbuf = dbuf;
434 ds->ds_object = dsobj;
435 ds->ds_is_snapshot = dsl_dataset_phys(ds)->ds_num_children != 0;
436
437 mutex_init(&ds->ds_lock, NULL, MUTEX_DEFAULT, NULL);
438 mutex_init(&ds->ds_opening_lock, NULL, MUTEX_DEFAULT, NULL);
439 mutex_init(&ds->ds_sendstream_lock, NULL, MUTEX_DEFAULT, NULL);
440 refcount_create(&ds->ds_longholds);
441
442 bplist_create(&ds->ds_pending_deadlist);
443 dsl_deadlist_open(&ds->ds_deadlist,
444 mos, dsl_dataset_phys(ds)->ds_deadlist_obj);
445
446 list_create(&ds->ds_sendstreams, sizeof (dmu_sendarg_t),
447 offsetof(dmu_sendarg_t, dsa_link));
448
449 list_create(&ds->ds_prop_cbs, sizeof (dsl_prop_cb_record_t),
450 offsetof(dsl_prop_cb_record_t, cbr_ds_node));
451
452 if (doi.doi_type == DMU_OTN_ZAP_METADATA) {
453 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) {
454 if (!(spa_feature_table[f].fi_flags &
455 ZFEATURE_FLAG_PER_DATASET))
456 continue;
457 err = zap_contains(mos, dsobj,
458 spa_feature_table[f].fi_guid);
459 if (err == 0) {
460 ds->ds_feature_inuse[f] = B_TRUE;
461 } else {
462 ASSERT3U(err, ==, ENOENT);
463 err = 0;
464 }
465 }
466 }
467
468 err = dsl_dir_hold_obj(dp,
469 dsl_dataset_phys(ds)->ds_dir_obj, NULL, ds, &ds->ds_dir);
470 if (err != 0) {
471 mutex_destroy(&ds->ds_lock);
472 mutex_destroy(&ds->ds_opening_lock);
473 mutex_destroy(&ds->ds_sendstream_lock);
474 refcount_destroy(&ds->ds_longholds);
475 bplist_destroy(&ds->ds_pending_deadlist);
476 dsl_deadlist_close(&ds->ds_deadlist);
477 kmem_free(ds, sizeof (dsl_dataset_t));
478 dmu_buf_rele(dbuf, tag);
479 return (err);
480 }
481
482 if (!ds->ds_is_snapshot) {
483 ds->ds_snapname[0] = '\0';
484 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) {
485 err = dsl_dataset_hold_obj(dp,
486 dsl_dataset_phys(ds)->ds_prev_snap_obj,
487 ds, &ds->ds_prev);
488 }
489 if (doi.doi_type == DMU_OTN_ZAP_METADATA) {
490 int zaperr = zap_lookup(mos, ds->ds_object,
491 DS_FIELD_BOOKMARK_NAMES,
492 sizeof (ds->ds_bookmarks), 1,
493 &ds->ds_bookmarks);
494 if (zaperr != ENOENT)
495 VERIFY0(zaperr);
496 }
497 } else {
498 if (zfs_flags & ZFS_DEBUG_SNAPNAMES)
499 err = dsl_dataset_get_snapname(ds);
500 if (err == 0 &&
501 dsl_dataset_phys(ds)->ds_userrefs_obj != 0) {
502 err = zap_count(
503 ds->ds_dir->dd_pool->dp_meta_objset,
504 dsl_dataset_phys(ds)->ds_userrefs_obj,
505 &ds->ds_userrefs);
506 }
507 }
508
509 if (err == 0 && !ds->ds_is_snapshot) {
510 err = dsl_prop_get_int_ds(ds,
511 zfs_prop_to_name(ZFS_PROP_REFRESERVATION),
512 &ds->ds_reserved);
513 if (err == 0) {
514 err = dsl_prop_get_int_ds(ds,
515 zfs_prop_to_name(ZFS_PROP_REFQUOTA),
516 &ds->ds_quota);
517 }
518 } else {
519 ds->ds_reserved = ds->ds_quota = 0;
520 }
521
522 dmu_buf_init_user(&ds->ds_dbu, dsl_dataset_evict, &ds->ds_dbuf);
523 if (err == 0)
524 winner = dmu_buf_set_user_ie(dbuf, &ds->ds_dbu);
525
526 if (err != 0 || winner != NULL) {
527 bplist_destroy(&ds->ds_pending_deadlist);
528 dsl_deadlist_close(&ds->ds_deadlist);
529 if (ds->ds_prev)
530 dsl_dataset_rele(ds->ds_prev, ds);
531 dsl_dir_rele(ds->ds_dir, ds);
532 mutex_destroy(&ds->ds_lock);
533 mutex_destroy(&ds->ds_opening_lock);
534 mutex_destroy(&ds->ds_sendstream_lock);
535 refcount_destroy(&ds->ds_longholds);
536 kmem_free(ds, sizeof (dsl_dataset_t));
537 if (err != 0) {
538 dmu_buf_rele(dbuf, tag);
539 return (err);
540 }
541 ds = winner;
542 } else {
543 ds->ds_fsid_guid =
544 unique_insert(dsl_dataset_phys(ds)->ds_fsid_guid);
545 }
546 }
547 ASSERT3P(ds->ds_dbuf, ==, dbuf);
548 ASSERT3P(dsl_dataset_phys(ds), ==, dbuf->db_data);
549 ASSERT(dsl_dataset_phys(ds)->ds_prev_snap_obj != 0 ||
550 spa_version(dp->dp_spa) < SPA_VERSION_ORIGIN ||
551 dp->dp_origin_snap == NULL || ds == dp->dp_origin_snap);
552 *dsp = ds;
553 return (0);
554 }
555
556 int
dsl_dataset_hold(dsl_pool_t * dp,const char * name,void * tag,dsl_dataset_t ** dsp)557 dsl_dataset_hold(dsl_pool_t *dp, const char *name,
558 void *tag, dsl_dataset_t **dsp)
559 {
560 dsl_dir_t *dd;
561 const char *snapname;
562 uint64_t obj;
563 int err = 0;
564 dsl_dataset_t *ds;
565
566 err = dsl_dir_hold(dp, name, FTAG, &dd, &snapname);
567 if (err != 0)
568 return (err);
569
570 ASSERT(dsl_pool_config_held(dp));
571 obj = dsl_dir_phys(dd)->dd_head_dataset_obj;
572 if (obj != 0)
573 err = dsl_dataset_hold_obj(dp, obj, tag, &ds);
574 else
575 err = SET_ERROR(ENOENT);
576
577 /* we may be looking for a snapshot */
578 if (err == 0 && snapname != NULL) {
579 dsl_dataset_t *snap_ds;
580
581 if (*snapname++ != '@') {
582 dsl_dataset_rele(ds, tag);
583 dsl_dir_rele(dd, FTAG);
584 return (SET_ERROR(ENOENT));
585 }
586
587 dprintf("looking for snapshot '%s'\n", snapname);
588 err = dsl_dataset_snap_lookup(ds, snapname, &obj);
589 if (err == 0)
590 err = dsl_dataset_hold_obj(dp, obj, tag, &snap_ds);
591 dsl_dataset_rele(ds, tag);
592
593 if (err == 0) {
594 mutex_enter(&snap_ds->ds_lock);
595 if (snap_ds->ds_snapname[0] == 0)
596 (void) strlcpy(snap_ds->ds_snapname, snapname,
597 sizeof (snap_ds->ds_snapname));
598 mutex_exit(&snap_ds->ds_lock);
599 ds = snap_ds;
600 }
601 }
602 if (err == 0)
603 *dsp = ds;
604 dsl_dir_rele(dd, FTAG);
605 return (err);
606 }
607
608 int
dsl_dataset_own_obj(dsl_pool_t * dp,uint64_t dsobj,void * tag,dsl_dataset_t ** dsp)609 dsl_dataset_own_obj(dsl_pool_t *dp, uint64_t dsobj,
610 void *tag, dsl_dataset_t **dsp)
611 {
612 int err = dsl_dataset_hold_obj(dp, dsobj, tag, dsp);
613 if (err != 0)
614 return (err);
615 if (!dsl_dataset_tryown(*dsp, tag)) {
616 dsl_dataset_rele(*dsp, tag);
617 *dsp = NULL;
618 return (SET_ERROR(EBUSY));
619 }
620 return (0);
621 }
622
623 int
dsl_dataset_own(dsl_pool_t * dp,const char * name,void * tag,dsl_dataset_t ** dsp)624 dsl_dataset_own(dsl_pool_t *dp, const char *name,
625 void *tag, dsl_dataset_t **dsp)
626 {
627 int err = dsl_dataset_hold(dp, name, tag, dsp);
628 if (err != 0)
629 return (err);
630 if (!dsl_dataset_tryown(*dsp, tag)) {
631 dsl_dataset_rele(*dsp, tag);
632 return (SET_ERROR(EBUSY));
633 }
634 return (0);
635 }
636
637 /*
638 * See the comment above dsl_pool_hold() for details. In summary, a long
639 * hold is used to prevent destruction of a dataset while the pool hold
640 * is dropped, allowing other concurrent operations (e.g. spa_sync()).
641 *
642 * The dataset and pool must be held when this function is called. After it
643 * is called, the pool hold may be released while the dataset is still held
644 * and accessed.
645 */
646 void
dsl_dataset_long_hold(dsl_dataset_t * ds,void * tag)647 dsl_dataset_long_hold(dsl_dataset_t *ds, void *tag)
648 {
649 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool));
650 (void) refcount_add(&ds->ds_longholds, tag);
651 }
652
653 void
dsl_dataset_long_rele(dsl_dataset_t * ds,void * tag)654 dsl_dataset_long_rele(dsl_dataset_t *ds, void *tag)
655 {
656 (void) refcount_remove(&ds->ds_longholds, tag);
657 }
658
659 /* Return B_TRUE if there are any long holds on this dataset. */
660 boolean_t
dsl_dataset_long_held(dsl_dataset_t * ds)661 dsl_dataset_long_held(dsl_dataset_t *ds)
662 {
663 return (!refcount_is_zero(&ds->ds_longholds));
664 }
665
666 void
dsl_dataset_name(dsl_dataset_t * ds,char * name)667 dsl_dataset_name(dsl_dataset_t *ds, char *name)
668 {
669 if (ds == NULL) {
670 (void) strcpy(name, "mos");
671 } else {
672 dsl_dir_name(ds->ds_dir, name);
673 VERIFY0(dsl_dataset_get_snapname(ds));
674 if (ds->ds_snapname[0]) {
675 (void) strcat(name, "@");
676 /*
677 * We use a "recursive" mutex so that we
678 * can call dprintf_ds() with ds_lock held.
679 */
680 if (!MUTEX_HELD(&ds->ds_lock)) {
681 mutex_enter(&ds->ds_lock);
682 (void) strcat(name, ds->ds_snapname);
683 mutex_exit(&ds->ds_lock);
684 } else {
685 (void) strcat(name, ds->ds_snapname);
686 }
687 }
688 }
689 }
690
691 void
dsl_dataset_rele(dsl_dataset_t * ds,void * tag)692 dsl_dataset_rele(dsl_dataset_t *ds, void *tag)
693 {
694 dmu_buf_rele(ds->ds_dbuf, tag);
695 }
696
697 void
dsl_dataset_disown(dsl_dataset_t * ds,void * tag)698 dsl_dataset_disown(dsl_dataset_t *ds, void *tag)
699 {
700 ASSERT3P(ds->ds_owner, ==, tag);
701 ASSERT(ds->ds_dbuf != NULL);
702
703 mutex_enter(&ds->ds_lock);
704 ds->ds_owner = NULL;
705 mutex_exit(&ds->ds_lock);
706 dsl_dataset_long_rele(ds, tag);
707 dsl_dataset_rele(ds, tag);
708 }
709
710 boolean_t
dsl_dataset_tryown(dsl_dataset_t * ds,void * tag)711 dsl_dataset_tryown(dsl_dataset_t *ds, void *tag)
712 {
713 boolean_t gotit = FALSE;
714
715 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool));
716 mutex_enter(&ds->ds_lock);
717 if (ds->ds_owner == NULL && !DS_IS_INCONSISTENT(ds)) {
718 ds->ds_owner = tag;
719 dsl_dataset_long_hold(ds, tag);
720 gotit = TRUE;
721 }
722 mutex_exit(&ds->ds_lock);
723 return (gotit);
724 }
725
726 boolean_t
dsl_dataset_has_owner(dsl_dataset_t * ds)727 dsl_dataset_has_owner(dsl_dataset_t *ds)
728 {
729 boolean_t rv;
730 mutex_enter(&ds->ds_lock);
731 rv = (ds->ds_owner != NULL);
732 mutex_exit(&ds->ds_lock);
733 return (rv);
734 }
735
736 static void
dsl_dataset_activate_feature(uint64_t dsobj,spa_feature_t f,dmu_tx_t * tx)737 dsl_dataset_activate_feature(uint64_t dsobj, spa_feature_t f, dmu_tx_t *tx)
738 {
739 spa_t *spa = dmu_tx_pool(tx)->dp_spa;
740 objset_t *mos = dmu_tx_pool(tx)->dp_meta_objset;
741 uint64_t zero = 0;
742
743 VERIFY(spa_feature_table[f].fi_flags & ZFEATURE_FLAG_PER_DATASET);
744
745 spa_feature_incr(spa, f, tx);
746 dmu_object_zapify(mos, dsobj, DMU_OT_DSL_DATASET, tx);
747
748 VERIFY0(zap_add(mos, dsobj, spa_feature_table[f].fi_guid,
749 sizeof (zero), 1, &zero, tx));
750 }
751
752 void
dsl_dataset_deactivate_feature(uint64_t dsobj,spa_feature_t f,dmu_tx_t * tx)753 dsl_dataset_deactivate_feature(uint64_t dsobj, spa_feature_t f, dmu_tx_t *tx)
754 {
755 spa_t *spa = dmu_tx_pool(tx)->dp_spa;
756 objset_t *mos = dmu_tx_pool(tx)->dp_meta_objset;
757
758 VERIFY(spa_feature_table[f].fi_flags & ZFEATURE_FLAG_PER_DATASET);
759
760 VERIFY0(zap_remove(mos, dsobj, spa_feature_table[f].fi_guid, tx));
761 spa_feature_decr(spa, f, tx);
762 }
763
764 uint64_t
dsl_dataset_create_sync_dd(dsl_dir_t * dd,dsl_dataset_t * origin,uint64_t flags,dmu_tx_t * tx)765 dsl_dataset_create_sync_dd(dsl_dir_t *dd, dsl_dataset_t *origin,
766 uint64_t flags, dmu_tx_t *tx)
767 {
768 dsl_pool_t *dp = dd->dd_pool;
769 dmu_buf_t *dbuf;
770 dsl_dataset_phys_t *dsphys;
771 uint64_t dsobj;
772 objset_t *mos = dp->dp_meta_objset;
773
774 if (origin == NULL)
775 origin = dp->dp_origin_snap;
776
777 ASSERT(origin == NULL || origin->ds_dir->dd_pool == dp);
778 ASSERT(origin == NULL || dsl_dataset_phys(origin)->ds_num_children > 0);
779 ASSERT(dmu_tx_is_syncing(tx));
780 ASSERT(dsl_dir_phys(dd)->dd_head_dataset_obj == 0);
781
782 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0,
783 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx);
784 VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf));
785 dmu_buf_will_dirty(dbuf, tx);
786 dsphys = dbuf->db_data;
787 bzero(dsphys, sizeof (dsl_dataset_phys_t));
788 dsphys->ds_dir_obj = dd->dd_object;
789 dsphys->ds_flags = flags;
790 dsphys->ds_fsid_guid = unique_create();
791 do {
792 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid,
793 sizeof (dsphys->ds_guid));
794 } while (dsphys->ds_guid == 0);
795 dsphys->ds_snapnames_zapobj =
796 zap_create_norm(mos, U8_TEXTPREP_TOUPPER, DMU_OT_DSL_DS_SNAP_MAP,
797 DMU_OT_NONE, 0, tx);
798 dsphys->ds_creation_time = gethrestime_sec();
799 dsphys->ds_creation_txg = tx->tx_txg == TXG_INITIAL ? 1 : tx->tx_txg;
800
801 if (origin == NULL) {
802 dsphys->ds_deadlist_obj = dsl_deadlist_alloc(mos, tx);
803 } else {
804 dsl_dataset_t *ohds; /* head of the origin snapshot */
805
806 dsphys->ds_prev_snap_obj = origin->ds_object;
807 dsphys->ds_prev_snap_txg =
808 dsl_dataset_phys(origin)->ds_creation_txg;
809 dsphys->ds_referenced_bytes =
810 dsl_dataset_phys(origin)->ds_referenced_bytes;
811 dsphys->ds_compressed_bytes =
812 dsl_dataset_phys(origin)->ds_compressed_bytes;
813 dsphys->ds_uncompressed_bytes =
814 dsl_dataset_phys(origin)->ds_uncompressed_bytes;
815 dsphys->ds_bp = dsl_dataset_phys(origin)->ds_bp;
816
817 /*
818 * Inherit flags that describe the dataset's contents
819 * (INCONSISTENT) or properties (Case Insensitive).
820 */
821 dsphys->ds_flags |= dsl_dataset_phys(origin)->ds_flags &
822 (DS_FLAG_INCONSISTENT | DS_FLAG_CI_DATASET);
823
824 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) {
825 if (origin->ds_feature_inuse[f])
826 dsl_dataset_activate_feature(dsobj, f, tx);
827 }
828
829 dmu_buf_will_dirty(origin->ds_dbuf, tx);
830 dsl_dataset_phys(origin)->ds_num_children++;
831
832 VERIFY0(dsl_dataset_hold_obj(dp,
833 dsl_dir_phys(origin->ds_dir)->dd_head_dataset_obj,
834 FTAG, &ohds));
835 dsphys->ds_deadlist_obj = dsl_deadlist_clone(&ohds->ds_deadlist,
836 dsphys->ds_prev_snap_txg, dsphys->ds_prev_snap_obj, tx);
837 dsl_dataset_rele(ohds, FTAG);
838
839 if (spa_version(dp->dp_spa) >= SPA_VERSION_NEXT_CLONES) {
840 if (dsl_dataset_phys(origin)->ds_next_clones_obj == 0) {
841 dsl_dataset_phys(origin)->ds_next_clones_obj =
842 zap_create(mos,
843 DMU_OT_NEXT_CLONES, DMU_OT_NONE, 0, tx);
844 }
845 VERIFY0(zap_add_int(mos,
846 dsl_dataset_phys(origin)->ds_next_clones_obj,
847 dsobj, tx));
848 }
849
850 dmu_buf_will_dirty(dd->dd_dbuf, tx);
851 dsl_dir_phys(dd)->dd_origin_obj = origin->ds_object;
852 if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) {
853 if (dsl_dir_phys(origin->ds_dir)->dd_clones == 0) {
854 dmu_buf_will_dirty(origin->ds_dir->dd_dbuf, tx);
855 dsl_dir_phys(origin->ds_dir)->dd_clones =
856 zap_create(mos,
857 DMU_OT_DSL_CLONES, DMU_OT_NONE, 0, tx);
858 }
859 VERIFY0(zap_add_int(mos,
860 dsl_dir_phys(origin->ds_dir)->dd_clones,
861 dsobj, tx));
862 }
863 }
864
865 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE)
866 dsphys->ds_flags |= DS_FLAG_UNIQUE_ACCURATE;
867
868 dmu_buf_rele(dbuf, FTAG);
869
870 dmu_buf_will_dirty(dd->dd_dbuf, tx);
871 dsl_dir_phys(dd)->dd_head_dataset_obj = dsobj;
872
873 return (dsobj);
874 }
875
876 static void
dsl_dataset_zero_zil(dsl_dataset_t * ds,dmu_tx_t * tx)877 dsl_dataset_zero_zil(dsl_dataset_t *ds, dmu_tx_t *tx)
878 {
879 objset_t *os;
880
881 VERIFY0(dmu_objset_from_ds(ds, &os));
882 bzero(&os->os_zil_header, sizeof (os->os_zil_header));
883 dsl_dataset_dirty(ds, tx);
884 }
885
886 uint64_t
dsl_dataset_create_sync(dsl_dir_t * pdd,const char * lastname,dsl_dataset_t * origin,uint64_t flags,cred_t * cr,dmu_tx_t * tx)887 dsl_dataset_create_sync(dsl_dir_t *pdd, const char *lastname,
888 dsl_dataset_t *origin, uint64_t flags, cred_t *cr, dmu_tx_t *tx)
889 {
890 dsl_pool_t *dp = pdd->dd_pool;
891 uint64_t dsobj, ddobj;
892 dsl_dir_t *dd;
893
894 ASSERT(dmu_tx_is_syncing(tx));
895 ASSERT(lastname[0] != '@');
896
897 ddobj = dsl_dir_create_sync(dp, pdd, lastname, tx);
898 VERIFY0(dsl_dir_hold_obj(dp, ddobj, lastname, FTAG, &dd));
899
900 dsobj = dsl_dataset_create_sync_dd(dd, origin,
901 flags & ~DS_CREATE_FLAG_NODIRTY, tx);
902
903 dsl_deleg_set_create_perms(dd, tx, cr);
904
905 /*
906 * Since we're creating a new node we know it's a leaf, so we can
907 * initialize the counts if the limit feature is active.
908 */
909 if (spa_feature_is_active(dp->dp_spa, SPA_FEATURE_FS_SS_LIMIT)) {
910 uint64_t cnt = 0;
911 objset_t *os = dd->dd_pool->dp_meta_objset;
912
913 dsl_dir_zapify(dd, tx);
914 VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_FILESYSTEM_COUNT,
915 sizeof (cnt), 1, &cnt, tx));
916 VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_SNAPSHOT_COUNT,
917 sizeof (cnt), 1, &cnt, tx));
918 }
919
920 dsl_dir_rele(dd, FTAG);
921
922 /*
923 * If we are creating a clone, make sure we zero out any stale
924 * data from the origin snapshots zil header.
925 */
926 if (origin != NULL && !(flags & DS_CREATE_FLAG_NODIRTY)) {
927 dsl_dataset_t *ds;
928
929 VERIFY0(dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds));
930 dsl_dataset_zero_zil(ds, tx);
931 dsl_dataset_rele(ds, FTAG);
932 }
933
934 return (dsobj);
935 }
936
937 #ifdef __FreeBSD__
938 /* FreeBSD ioctl compat begin */
939 struct destroyarg {
940 nvlist_t *nvl;
941 const char *snapname;
942 };
943
944 static int
dsl_check_snap_cb(const char * name,void * arg)945 dsl_check_snap_cb(const char *name, void *arg)
946 {
947 struct destroyarg *da = arg;
948 dsl_dataset_t *ds;
949 char *dsname;
950
951 dsname = kmem_asprintf("%s@%s", name, da->snapname);
952 fnvlist_add_boolean(da->nvl, dsname);
953 kmem_free(dsname, strlen(dsname) + 1);
954
955 return (0);
956 }
957
958 int
dmu_get_recursive_snaps_nvl(char * fsname,const char * snapname,nvlist_t * snaps)959 dmu_get_recursive_snaps_nvl(char *fsname, const char *snapname,
960 nvlist_t *snaps)
961 {
962 struct destroyarg *da;
963 int err;
964
965 da = kmem_zalloc(sizeof (struct destroyarg), KM_SLEEP);
966 da->nvl = snaps;
967 da->snapname = snapname;
968 err = dmu_objset_find(fsname, dsl_check_snap_cb, da,
969 DS_FIND_CHILDREN);
970 kmem_free(da, sizeof (struct destroyarg));
971
972 return (err);
973 }
974 /* FreeBSD ioctl compat end */
975 #endif /* __FreeBSD__ */
976
977 /*
978 * The unique space in the head dataset can be calculated by subtracting
979 * the space used in the most recent snapshot, that is still being used
980 * in this file system, from the space currently in use. To figure out
981 * the space in the most recent snapshot still in use, we need to take
982 * the total space used in the snapshot and subtract out the space that
983 * has been freed up since the snapshot was taken.
984 */
985 void
dsl_dataset_recalc_head_uniq(dsl_dataset_t * ds)986 dsl_dataset_recalc_head_uniq(dsl_dataset_t *ds)
987 {
988 uint64_t mrs_used;
989 uint64_t dlused, dlcomp, dluncomp;
990
991 ASSERT(!ds->ds_is_snapshot);
992
993 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0)
994 mrs_used = dsl_dataset_phys(ds->ds_prev)->ds_referenced_bytes;
995 else
996 mrs_used = 0;
997
998 dsl_deadlist_space(&ds->ds_deadlist, &dlused, &dlcomp, &dluncomp);
999
1000 ASSERT3U(dlused, <=, mrs_used);
1001 dsl_dataset_phys(ds)->ds_unique_bytes =
1002 dsl_dataset_phys(ds)->ds_referenced_bytes - (mrs_used - dlused);
1003
1004 if (spa_version(ds->ds_dir->dd_pool->dp_spa) >=
1005 SPA_VERSION_UNIQUE_ACCURATE)
1006 dsl_dataset_phys(ds)->ds_flags |= DS_FLAG_UNIQUE_ACCURATE;
1007 }
1008
1009 void
dsl_dataset_remove_from_next_clones(dsl_dataset_t * ds,uint64_t obj,dmu_tx_t * tx)1010 dsl_dataset_remove_from_next_clones(dsl_dataset_t *ds, uint64_t obj,
1011 dmu_tx_t *tx)
1012 {
1013 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
1014 uint64_t count;
1015 int err;
1016
1017 ASSERT(dsl_dataset_phys(ds)->ds_num_children >= 2);
1018 err = zap_remove_int(mos, dsl_dataset_phys(ds)->ds_next_clones_obj,
1019 obj, tx);
1020 /*
1021 * The err should not be ENOENT, but a bug in a previous version
1022 * of the code could cause upgrade_clones_cb() to not set
1023 * ds_next_snap_obj when it should, leading to a missing entry.
1024 * If we knew that the pool was created after
1025 * SPA_VERSION_NEXT_CLONES, we could assert that it isn't
1026 * ENOENT. However, at least we can check that we don't have
1027 * too many entries in the next_clones_obj even after failing to
1028 * remove this one.
1029 */
1030 if (err != ENOENT)
1031 VERIFY0(err);
1032 ASSERT0(zap_count(mos, dsl_dataset_phys(ds)->ds_next_clones_obj,
1033 &count));
1034 ASSERT3U(count, <=, dsl_dataset_phys(ds)->ds_num_children - 2);
1035 }
1036
1037
1038 blkptr_t *
dsl_dataset_get_blkptr(dsl_dataset_t * ds)1039 dsl_dataset_get_blkptr(dsl_dataset_t *ds)
1040 {
1041 return (&dsl_dataset_phys(ds)->ds_bp);
1042 }
1043
1044 void
dsl_dataset_set_blkptr(dsl_dataset_t * ds,blkptr_t * bp,dmu_tx_t * tx)1045 dsl_dataset_set_blkptr(dsl_dataset_t *ds, blkptr_t *bp, dmu_tx_t *tx)
1046 {
1047 ASSERT(dmu_tx_is_syncing(tx));
1048 /* If it's the meta-objset, set dp_meta_rootbp */
1049 if (ds == NULL) {
1050 tx->tx_pool->dp_meta_rootbp = *bp;
1051 } else {
1052 dmu_buf_will_dirty(ds->ds_dbuf, tx);
1053 dsl_dataset_phys(ds)->ds_bp = *bp;
1054 }
1055 }
1056
1057 spa_t *
dsl_dataset_get_spa(dsl_dataset_t * ds)1058 dsl_dataset_get_spa(dsl_dataset_t *ds)
1059 {
1060 return (ds->ds_dir->dd_pool->dp_spa);
1061 }
1062
1063 void
dsl_dataset_dirty(dsl_dataset_t * ds,dmu_tx_t * tx)1064 dsl_dataset_dirty(dsl_dataset_t *ds, dmu_tx_t *tx)
1065 {
1066 dsl_pool_t *dp;
1067
1068 if (ds == NULL) /* this is the meta-objset */
1069 return;
1070
1071 ASSERT(ds->ds_objset != NULL);
1072
1073 if (dsl_dataset_phys(ds)->ds_next_snap_obj != 0)
1074 panic("dirtying snapshot!");
1075
1076 dp = ds->ds_dir->dd_pool;
1077
1078 if (txg_list_add(&dp->dp_dirty_datasets, ds, tx->tx_txg)) {
1079 /* up the hold count until we can be written out */
1080 dmu_buf_add_ref(ds->ds_dbuf, ds);
1081 }
1082 }
1083
1084 boolean_t
dsl_dataset_is_dirty(dsl_dataset_t * ds)1085 dsl_dataset_is_dirty(dsl_dataset_t *ds)
1086 {
1087 for (int t = 0; t < TXG_SIZE; t++) {
1088 if (txg_list_member(&ds->ds_dir->dd_pool->dp_dirty_datasets,
1089 ds, t))
1090 return (B_TRUE);
1091 }
1092 return (B_FALSE);
1093 }
1094
1095 static int
dsl_dataset_snapshot_reserve_space(dsl_dataset_t * ds,dmu_tx_t * tx)1096 dsl_dataset_snapshot_reserve_space(dsl_dataset_t *ds, dmu_tx_t *tx)
1097 {
1098 uint64_t asize;
1099
1100 if (!dmu_tx_is_syncing(tx))
1101 return (0);
1102
1103 /*
1104 * If there's an fs-only reservation, any blocks that might become
1105 * owned by the snapshot dataset must be accommodated by space
1106 * outside of the reservation.
1107 */
1108 ASSERT(ds->ds_reserved == 0 || DS_UNIQUE_IS_ACCURATE(ds));
1109 asize = MIN(dsl_dataset_phys(ds)->ds_unique_bytes, ds->ds_reserved);
1110 if (asize > dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE))
1111 return (SET_ERROR(ENOSPC));
1112
1113 /*
1114 * Propagate any reserved space for this snapshot to other
1115 * snapshot checks in this sync group.
1116 */
1117 if (asize > 0)
1118 dsl_dir_willuse_space(ds->ds_dir, asize, tx);
1119
1120 return (0);
1121 }
1122
1123 typedef struct dsl_dataset_snapshot_arg {
1124 nvlist_t *ddsa_snaps;
1125 nvlist_t *ddsa_props;
1126 nvlist_t *ddsa_errors;
1127 cred_t *ddsa_cr;
1128 } dsl_dataset_snapshot_arg_t;
1129
1130 int
dsl_dataset_snapshot_check_impl(dsl_dataset_t * ds,const char * snapname,dmu_tx_t * tx,boolean_t recv,uint64_t cnt,cred_t * cr)1131 dsl_dataset_snapshot_check_impl(dsl_dataset_t *ds, const char *snapname,
1132 dmu_tx_t *tx, boolean_t recv, uint64_t cnt, cred_t *cr)
1133 {
1134 int error;
1135 uint64_t value;
1136
1137 ds->ds_trysnap_txg = tx->tx_txg;
1138
1139 if (!dmu_tx_is_syncing(tx))
1140 return (0);
1141
1142 /*
1143 * We don't allow multiple snapshots of the same txg. If there
1144 * is already one, try again.
1145 */
1146 if (dsl_dataset_phys(ds)->ds_prev_snap_txg >= tx->tx_txg)
1147 return (SET_ERROR(EAGAIN));
1148
1149 /*
1150 * Check for conflicting snapshot name.
1151 */
1152 error = dsl_dataset_snap_lookup(ds, snapname, &value);
1153 if (error == 0)
1154 return (SET_ERROR(EEXIST));
1155 if (error != ENOENT)
1156 return (error);
1157
1158 /*
1159 * We don't allow taking snapshots of inconsistent datasets, such as
1160 * those into which we are currently receiving. However, if we are
1161 * creating this snapshot as part of a receive, this check will be
1162 * executed atomically with respect to the completion of the receive
1163 * itself but prior to the clearing of DS_FLAG_INCONSISTENT; in this
1164 * case we ignore this, knowing it will be fixed up for us shortly in
1165 * dmu_recv_end_sync().
1166 */
1167 if (!recv && DS_IS_INCONSISTENT(ds))
1168 return (SET_ERROR(EBUSY));
1169
1170 /*
1171 * Skip the check for temporary snapshots or if we have already checked
1172 * the counts in dsl_dataset_snapshot_check. This means we really only
1173 * check the count here when we're receiving a stream.
1174 */
1175 if (cnt != 0 && cr != NULL) {
1176 error = dsl_fs_ss_limit_check(ds->ds_dir, cnt,
1177 ZFS_PROP_SNAPSHOT_LIMIT, NULL, cr);
1178 if (error != 0)
1179 return (error);
1180 }
1181
1182 error = dsl_dataset_snapshot_reserve_space(ds, tx);
1183 if (error != 0)
1184 return (error);
1185
1186 return (0);
1187 }
1188
1189 static int
dsl_dataset_snapshot_check(void * arg,dmu_tx_t * tx)1190 dsl_dataset_snapshot_check(void *arg, dmu_tx_t *tx)
1191 {
1192 dsl_dataset_snapshot_arg_t *ddsa = arg;
1193 dsl_pool_t *dp = dmu_tx_pool(tx);
1194 nvpair_t *pair;
1195 int rv = 0;
1196
1197 /*
1198 * Pre-compute how many total new snapshots will be created for each
1199 * level in the tree and below. This is needed for validating the
1200 * snapshot limit when either taking a recursive snapshot or when
1201 * taking multiple snapshots.
1202 *
1203 * The problem is that the counts are not actually adjusted when
1204 * we are checking, only when we finally sync. For a single snapshot,
1205 * this is easy, the count will increase by 1 at each node up the tree,
1206 * but its more complicated for the recursive/multiple snapshot case.
1207 *
1208 * The dsl_fs_ss_limit_check function does recursively check the count
1209 * at each level up the tree but since it is validating each snapshot
1210 * independently we need to be sure that we are validating the complete
1211 * count for the entire set of snapshots. We do this by rolling up the
1212 * counts for each component of the name into an nvlist and then
1213 * checking each of those cases with the aggregated count.
1214 *
1215 * This approach properly handles not only the recursive snapshot
1216 * case (where we get all of those on the ddsa_snaps list) but also
1217 * the sibling case (e.g. snapshot a/b and a/c so that we will also
1218 * validate the limit on 'a' using a count of 2).
1219 *
1220 * We validate the snapshot names in the third loop and only report
1221 * name errors once.
1222 */
1223 if (dmu_tx_is_syncing(tx)) {
1224 nvlist_t *cnt_track = NULL;
1225 cnt_track = fnvlist_alloc();
1226
1227 /* Rollup aggregated counts into the cnt_track list */
1228 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL);
1229 pair != NULL;
1230 pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) {
1231 char *pdelim;
1232 uint64_t val;
1233 char nm[MAXPATHLEN];
1234
1235 (void) strlcpy(nm, nvpair_name(pair), sizeof (nm));
1236 pdelim = strchr(nm, '@');
1237 if (pdelim == NULL)
1238 continue;
1239 *pdelim = '\0';
1240
1241 do {
1242 if (nvlist_lookup_uint64(cnt_track, nm,
1243 &val) == 0) {
1244 /* update existing entry */
1245 fnvlist_add_uint64(cnt_track, nm,
1246 val + 1);
1247 } else {
1248 /* add to list */
1249 fnvlist_add_uint64(cnt_track, nm, 1);
1250 }
1251
1252 pdelim = strrchr(nm, '/');
1253 if (pdelim != NULL)
1254 *pdelim = '\0';
1255 } while (pdelim != NULL);
1256 }
1257
1258 /* Check aggregated counts at each level */
1259 for (pair = nvlist_next_nvpair(cnt_track, NULL);
1260 pair != NULL; pair = nvlist_next_nvpair(cnt_track, pair)) {
1261 int error = 0;
1262 char *name;
1263 uint64_t cnt = 0;
1264 dsl_dataset_t *ds;
1265
1266 name = nvpair_name(pair);
1267 cnt = fnvpair_value_uint64(pair);
1268 ASSERT(cnt > 0);
1269
1270 error = dsl_dataset_hold(dp, name, FTAG, &ds);
1271 if (error == 0) {
1272 error = dsl_fs_ss_limit_check(ds->ds_dir, cnt,
1273 ZFS_PROP_SNAPSHOT_LIMIT, NULL,
1274 ddsa->ddsa_cr);
1275 dsl_dataset_rele(ds, FTAG);
1276 }
1277
1278 if (error != 0) {
1279 if (ddsa->ddsa_errors != NULL)
1280 fnvlist_add_int32(ddsa->ddsa_errors,
1281 name, error);
1282 rv = error;
1283 /* only report one error for this check */
1284 break;
1285 }
1286 }
1287 nvlist_free(cnt_track);
1288 }
1289
1290 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL);
1291 pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) {
1292 int error = 0;
1293 dsl_dataset_t *ds;
1294 char *name, *atp;
1295 char dsname[MAXNAMELEN];
1296
1297 name = nvpair_name(pair);
1298 if (strlen(name) >= MAXNAMELEN)
1299 error = SET_ERROR(ENAMETOOLONG);
1300 if (error == 0) {
1301 atp = strchr(name, '@');
1302 if (atp == NULL)
1303 error = SET_ERROR(EINVAL);
1304 if (error == 0)
1305 (void) strlcpy(dsname, name, atp - name + 1);
1306 }
1307 if (error == 0)
1308 error = dsl_dataset_hold(dp, dsname, FTAG, &ds);
1309 if (error == 0) {
1310 /* passing 0/NULL skips dsl_fs_ss_limit_check */
1311 error = dsl_dataset_snapshot_check_impl(ds,
1312 atp + 1, tx, B_FALSE, 0, NULL);
1313 dsl_dataset_rele(ds, FTAG);
1314 }
1315
1316 if (error != 0) {
1317 if (ddsa->ddsa_errors != NULL) {
1318 fnvlist_add_int32(ddsa->ddsa_errors,
1319 name, error);
1320 }
1321 rv = error;
1322 }
1323 }
1324
1325 return (rv);
1326 }
1327
1328 void
dsl_dataset_snapshot_sync_impl(dsl_dataset_t * ds,const char * snapname,dmu_tx_t * tx)1329 dsl_dataset_snapshot_sync_impl(dsl_dataset_t *ds, const char *snapname,
1330 dmu_tx_t *tx)
1331 {
1332 static zil_header_t zero_zil;
1333
1334 dsl_pool_t *dp = ds->ds_dir->dd_pool;
1335 dmu_buf_t *dbuf;
1336 dsl_dataset_phys_t *dsphys;
1337 uint64_t dsobj, crtxg;
1338 objset_t *mos = dp->dp_meta_objset;
1339 objset_t *os;
1340
1341 ASSERT(RRW_WRITE_HELD(&dp->dp_config_rwlock));
1342
1343 /*
1344 * If we are on an old pool, the zil must not be active, in which
1345 * case it will be zeroed. Usually zil_suspend() accomplishes this.
1346 */
1347 ASSERT(spa_version(dmu_tx_pool(tx)->dp_spa) >= SPA_VERSION_FAST_SNAP ||
1348 dmu_objset_from_ds(ds, &os) != 0 ||
1349 bcmp(&os->os_phys->os_zil_header, &zero_zil,
1350 sizeof (zero_zil)) == 0);
1351
1352 dsl_fs_ss_count_adjust(ds->ds_dir, 1, DD_FIELD_SNAPSHOT_COUNT, tx);
1353
1354 /*
1355 * The origin's ds_creation_txg has to be < TXG_INITIAL
1356 */
1357 if (strcmp(snapname, ORIGIN_DIR_NAME) == 0)
1358 crtxg = 1;
1359 else
1360 crtxg = tx->tx_txg;
1361
1362 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0,
1363 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx);
1364 VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf));
1365 dmu_buf_will_dirty(dbuf, tx);
1366 dsphys = dbuf->db_data;
1367 bzero(dsphys, sizeof (dsl_dataset_phys_t));
1368 dsphys->ds_dir_obj = ds->ds_dir->dd_object;
1369 dsphys->ds_fsid_guid = unique_create();
1370 do {
1371 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid,
1372 sizeof (dsphys->ds_guid));
1373 } while (dsphys->ds_guid == 0);
1374 dsphys->ds_prev_snap_obj = dsl_dataset_phys(ds)->ds_prev_snap_obj;
1375 dsphys->ds_prev_snap_txg = dsl_dataset_phys(ds)->ds_prev_snap_txg;
1376 dsphys->ds_next_snap_obj = ds->ds_object;
1377 dsphys->ds_num_children = 1;
1378 dsphys->ds_creation_time = gethrestime_sec();
1379 dsphys->ds_creation_txg = crtxg;
1380 dsphys->ds_deadlist_obj = dsl_dataset_phys(ds)->ds_deadlist_obj;
1381 dsphys->ds_referenced_bytes = dsl_dataset_phys(ds)->ds_referenced_bytes;
1382 dsphys->ds_compressed_bytes = dsl_dataset_phys(ds)->ds_compressed_bytes;
1383 dsphys->ds_uncompressed_bytes =
1384 dsl_dataset_phys(ds)->ds_uncompressed_bytes;
1385 dsphys->ds_flags = dsl_dataset_phys(ds)->ds_flags;
1386 dsphys->ds_bp = dsl_dataset_phys(ds)->ds_bp;
1387 dmu_buf_rele(dbuf, FTAG);
1388
1389 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) {
1390 if (ds->ds_feature_inuse[f])
1391 dsl_dataset_activate_feature(dsobj, f, tx);
1392 }
1393
1394 ASSERT3U(ds->ds_prev != 0, ==,
1395 dsl_dataset_phys(ds)->ds_prev_snap_obj != 0);
1396 if (ds->ds_prev) {
1397 uint64_t next_clones_obj =
1398 dsl_dataset_phys(ds->ds_prev)->ds_next_clones_obj;
1399 ASSERT(dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj ==
1400 ds->ds_object ||
1401 dsl_dataset_phys(ds->ds_prev)->ds_num_children > 1);
1402 if (dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj ==
1403 ds->ds_object) {
1404 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx);
1405 ASSERT3U(dsl_dataset_phys(ds)->ds_prev_snap_txg, ==,
1406 dsl_dataset_phys(ds->ds_prev)->ds_creation_txg);
1407 dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj = dsobj;
1408 } else if (next_clones_obj != 0) {
1409 dsl_dataset_remove_from_next_clones(ds->ds_prev,
1410 dsphys->ds_next_snap_obj, tx);
1411 VERIFY0(zap_add_int(mos,
1412 next_clones_obj, dsobj, tx));
1413 }
1414 }
1415
1416 /*
1417 * If we have a reference-reservation on this dataset, we will
1418 * need to increase the amount of refreservation being charged
1419 * since our unique space is going to zero.
1420 */
1421 if (ds->ds_reserved) {
1422 int64_t delta;
1423 ASSERT(DS_UNIQUE_IS_ACCURATE(ds));
1424 delta = MIN(dsl_dataset_phys(ds)->ds_unique_bytes,
1425 ds->ds_reserved);
1426 dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV,
1427 delta, 0, 0, tx);
1428 }
1429
1430 dmu_buf_will_dirty(ds->ds_dbuf, tx);
1431 dsl_dataset_phys(ds)->ds_deadlist_obj =
1432 dsl_deadlist_clone(&ds->ds_deadlist, UINT64_MAX,
1433 dsl_dataset_phys(ds)->ds_prev_snap_obj, tx);
1434 dsl_deadlist_close(&ds->ds_deadlist);
1435 dsl_deadlist_open(&ds->ds_deadlist, mos,
1436 dsl_dataset_phys(ds)->ds_deadlist_obj);
1437 dsl_deadlist_add_key(&ds->ds_deadlist,
1438 dsl_dataset_phys(ds)->ds_prev_snap_txg, tx);
1439
1440 ASSERT3U(dsl_dataset_phys(ds)->ds_prev_snap_txg, <, tx->tx_txg);
1441 dsl_dataset_phys(ds)->ds_prev_snap_obj = dsobj;
1442 dsl_dataset_phys(ds)->ds_prev_snap_txg = crtxg;
1443 dsl_dataset_phys(ds)->ds_unique_bytes = 0;
1444 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE)
1445 dsl_dataset_phys(ds)->ds_flags |= DS_FLAG_UNIQUE_ACCURATE;
1446
1447 VERIFY0(zap_add(mos, dsl_dataset_phys(ds)->ds_snapnames_zapobj,
1448 snapname, 8, 1, &dsobj, tx));
1449
1450 if (ds->ds_prev)
1451 dsl_dataset_rele(ds->ds_prev, ds);
1452 VERIFY0(dsl_dataset_hold_obj(dp,
1453 dsl_dataset_phys(ds)->ds_prev_snap_obj, ds, &ds->ds_prev));
1454
1455 dsl_scan_ds_snapshotted(ds, tx);
1456
1457 dsl_dir_snap_cmtime_update(ds->ds_dir);
1458
1459 spa_history_log_internal_ds(ds->ds_prev, "snapshot", tx, "");
1460 }
1461
1462 static void
dsl_dataset_snapshot_sync(void * arg,dmu_tx_t * tx)1463 dsl_dataset_snapshot_sync(void *arg, dmu_tx_t *tx)
1464 {
1465 dsl_dataset_snapshot_arg_t *ddsa = arg;
1466 dsl_pool_t *dp = dmu_tx_pool(tx);
1467 nvpair_t *pair;
1468
1469 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL);
1470 pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) {
1471 dsl_dataset_t *ds;
1472 char *name, *atp;
1473 char dsname[MAXNAMELEN];
1474
1475 name = nvpair_name(pair);
1476 atp = strchr(name, '@');
1477 (void) strlcpy(dsname, name, atp - name + 1);
1478 VERIFY0(dsl_dataset_hold(dp, dsname, FTAG, &ds));
1479
1480 dsl_dataset_snapshot_sync_impl(ds, atp + 1, tx);
1481 if (ddsa->ddsa_props != NULL) {
1482 dsl_props_set_sync_impl(ds->ds_prev,
1483 ZPROP_SRC_LOCAL, ddsa->ddsa_props, tx);
1484 }
1485 dsl_dataset_rele(ds, FTAG);
1486 }
1487 }
1488
1489 /*
1490 * The snapshots must all be in the same pool.
1491 * All-or-nothing: if there are any failures, nothing will be modified.
1492 */
1493 int
dsl_dataset_snapshot(nvlist_t * snaps,nvlist_t * props,nvlist_t * errors)1494 dsl_dataset_snapshot(nvlist_t *snaps, nvlist_t *props, nvlist_t *errors)
1495 {
1496 dsl_dataset_snapshot_arg_t ddsa;
1497 nvpair_t *pair;
1498 boolean_t needsuspend;
1499 int error;
1500 spa_t *spa;
1501 char *firstname;
1502 nvlist_t *suspended = NULL;
1503
1504 pair = nvlist_next_nvpair(snaps, NULL);
1505 if (pair == NULL)
1506 return (0);
1507 firstname = nvpair_name(pair);
1508
1509 error = spa_open(firstname, &spa, FTAG);
1510 if (error != 0)
1511 return (error);
1512 needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP);
1513 spa_close(spa, FTAG);
1514
1515 if (needsuspend) {
1516 suspended = fnvlist_alloc();
1517 for (pair = nvlist_next_nvpair(snaps, NULL); pair != NULL;
1518 pair = nvlist_next_nvpair(snaps, pair)) {
1519 char fsname[MAXNAMELEN];
1520 char *snapname = nvpair_name(pair);
1521 char *atp;
1522 void *cookie;
1523
1524 atp = strchr(snapname, '@');
1525 if (atp == NULL) {
1526 error = SET_ERROR(EINVAL);
1527 break;
1528 }
1529 (void) strlcpy(fsname, snapname, atp - snapname + 1);
1530
1531 error = zil_suspend(fsname, &cookie);
1532 if (error != 0)
1533 break;
1534 fnvlist_add_uint64(suspended, fsname,
1535 (uintptr_t)cookie);
1536 }
1537 }
1538
1539 ddsa.ddsa_snaps = snaps;
1540 ddsa.ddsa_props = props;
1541 ddsa.ddsa_errors = errors;
1542 ddsa.ddsa_cr = CRED();
1543
1544 if (error == 0) {
1545 error = dsl_sync_task(firstname, dsl_dataset_snapshot_check,
1546 dsl_dataset_snapshot_sync, &ddsa,
1547 fnvlist_num_pairs(snaps) * 3, ZFS_SPACE_CHECK_NORMAL);
1548 }
1549
1550 if (suspended != NULL) {
1551 for (pair = nvlist_next_nvpair(suspended, NULL); pair != NULL;
1552 pair = nvlist_next_nvpair(suspended, pair)) {
1553 zil_resume((void *)(uintptr_t)
1554 fnvpair_value_uint64(pair));
1555 }
1556 fnvlist_free(suspended);
1557 }
1558
1559 #ifdef __FreeBSD__
1560 #ifdef _KERNEL
1561 if (error == 0) {
1562 for (pair = nvlist_next_nvpair(snaps, NULL); pair != NULL;
1563 pair = nvlist_next_nvpair(snaps, pair)) {
1564 char *snapname = nvpair_name(pair);
1565 zvol_create_minors(snapname);
1566 }
1567 }
1568 #endif
1569 #endif
1570 return (error);
1571 }
1572
1573 typedef struct dsl_dataset_snapshot_tmp_arg {
1574 const char *ddsta_fsname;
1575 const char *ddsta_snapname;
1576 minor_t ddsta_cleanup_minor;
1577 const char *ddsta_htag;
1578 } dsl_dataset_snapshot_tmp_arg_t;
1579
1580 static int
dsl_dataset_snapshot_tmp_check(void * arg,dmu_tx_t * tx)1581 dsl_dataset_snapshot_tmp_check(void *arg, dmu_tx_t *tx)
1582 {
1583 dsl_dataset_snapshot_tmp_arg_t *ddsta = arg;
1584 dsl_pool_t *dp = dmu_tx_pool(tx);
1585 dsl_dataset_t *ds;
1586 int error;
1587
1588 error = dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds);
1589 if (error != 0)
1590 return (error);
1591
1592 /* NULL cred means no limit check for tmp snapshot */
1593 error = dsl_dataset_snapshot_check_impl(ds, ddsta->ddsta_snapname,
1594 tx, B_FALSE, 0, NULL);
1595 if (error != 0) {
1596 dsl_dataset_rele(ds, FTAG);
1597 return (error);
1598 }
1599
1600 if (spa_version(dp->dp_spa) < SPA_VERSION_USERREFS) {
1601 dsl_dataset_rele(ds, FTAG);
1602 return (SET_ERROR(ENOTSUP));
1603 }
1604 error = dsl_dataset_user_hold_check_one(NULL, ddsta->ddsta_htag,
1605 B_TRUE, tx);
1606 if (error != 0) {
1607 dsl_dataset_rele(ds, FTAG);
1608 return (error);
1609 }
1610
1611 dsl_dataset_rele(ds, FTAG);
1612 return (0);
1613 }
1614
1615 static void
dsl_dataset_snapshot_tmp_sync(void * arg,dmu_tx_t * tx)1616 dsl_dataset_snapshot_tmp_sync(void *arg, dmu_tx_t *tx)
1617 {
1618 dsl_dataset_snapshot_tmp_arg_t *ddsta = arg;
1619 dsl_pool_t *dp = dmu_tx_pool(tx);
1620 dsl_dataset_t *ds;
1621
1622 VERIFY0(dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds));
1623
1624 dsl_dataset_snapshot_sync_impl(ds, ddsta->ddsta_snapname, tx);
1625 dsl_dataset_user_hold_sync_one(ds->ds_prev, ddsta->ddsta_htag,
1626 ddsta->ddsta_cleanup_minor, gethrestime_sec(), tx);
1627 dsl_destroy_snapshot_sync_impl(ds->ds_prev, B_TRUE, tx);
1628
1629 dsl_dataset_rele(ds, FTAG);
1630 }
1631
1632 int
dsl_dataset_snapshot_tmp(const char * fsname,const char * snapname,minor_t cleanup_minor,const char * htag)1633 dsl_dataset_snapshot_tmp(const char *fsname, const char *snapname,
1634 minor_t cleanup_minor, const char *htag)
1635 {
1636 dsl_dataset_snapshot_tmp_arg_t ddsta;
1637 int error;
1638 spa_t *spa;
1639 boolean_t needsuspend;
1640 void *cookie;
1641
1642 ddsta.ddsta_fsname = fsname;
1643 ddsta.ddsta_snapname = snapname;
1644 ddsta.ddsta_cleanup_minor = cleanup_minor;
1645 ddsta.ddsta_htag = htag;
1646
1647 error = spa_open(fsname, &spa, FTAG);
1648 if (error != 0)
1649 return (error);
1650 needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP);
1651 spa_close(spa, FTAG);
1652
1653 if (needsuspend) {
1654 error = zil_suspend(fsname, &cookie);
1655 if (error != 0)
1656 return (error);
1657 }
1658
1659 error = dsl_sync_task(fsname, dsl_dataset_snapshot_tmp_check,
1660 dsl_dataset_snapshot_tmp_sync, &ddsta, 3, ZFS_SPACE_CHECK_RESERVED);
1661
1662 if (needsuspend)
1663 zil_resume(cookie);
1664 return (error);
1665 }
1666
1667
1668 void
dsl_dataset_sync(dsl_dataset_t * ds,zio_t * zio,dmu_tx_t * tx)1669 dsl_dataset_sync(dsl_dataset_t *ds, zio_t *zio, dmu_tx_t *tx)
1670 {
1671 ASSERT(dmu_tx_is_syncing(tx));
1672 ASSERT(ds->ds_objset != NULL);
1673 ASSERT(dsl_dataset_phys(ds)->ds_next_snap_obj == 0);
1674
1675 /*
1676 * in case we had to change ds_fsid_guid when we opened it,
1677 * sync it out now.
1678 */
1679 dmu_buf_will_dirty(ds->ds_dbuf, tx);
1680 dsl_dataset_phys(ds)->ds_fsid_guid = ds->ds_fsid_guid;
1681
1682 if (ds->ds_resume_bytes[tx->tx_txg & TXG_MASK] != 0) {
1683 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset,
1684 ds->ds_object, DS_FIELD_RESUME_OBJECT, 8, 1,
1685 &ds->ds_resume_object[tx->tx_txg & TXG_MASK], tx));
1686 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset,
1687 ds->ds_object, DS_FIELD_RESUME_OFFSET, 8, 1,
1688 &ds->ds_resume_offset[tx->tx_txg & TXG_MASK], tx));
1689 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset,
1690 ds->ds_object, DS_FIELD_RESUME_BYTES, 8, 1,
1691 &ds->ds_resume_bytes[tx->tx_txg & TXG_MASK], tx));
1692 ds->ds_resume_object[tx->tx_txg & TXG_MASK] = 0;
1693 ds->ds_resume_offset[tx->tx_txg & TXG_MASK] = 0;
1694 ds->ds_resume_bytes[tx->tx_txg & TXG_MASK] = 0;
1695 }
1696
1697 dmu_objset_sync(ds->ds_objset, zio, tx);
1698
1699 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) {
1700 if (ds->ds_feature_activation_needed[f]) {
1701 if (ds->ds_feature_inuse[f])
1702 continue;
1703 dsl_dataset_activate_feature(ds->ds_object, f, tx);
1704 ds->ds_feature_inuse[f] = B_TRUE;
1705 }
1706 }
1707 }
1708
1709 static void
get_clones_stat(dsl_dataset_t * ds,nvlist_t * nv)1710 get_clones_stat(dsl_dataset_t *ds, nvlist_t *nv)
1711 {
1712 uint64_t count = 0;
1713 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
1714 zap_cursor_t zc;
1715 zap_attribute_t za;
1716 nvlist_t *propval = fnvlist_alloc();
1717 nvlist_t *val = fnvlist_alloc();
1718
1719 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool));
1720
1721 /*
1722 * There may be missing entries in ds_next_clones_obj
1723 * due to a bug in a previous version of the code.
1724 * Only trust it if it has the right number of entries.
1725 */
1726 if (dsl_dataset_phys(ds)->ds_next_clones_obj != 0) {
1727 VERIFY0(zap_count(mos, dsl_dataset_phys(ds)->ds_next_clones_obj,
1728 &count));
1729 }
1730 if (count != dsl_dataset_phys(ds)->ds_num_children - 1)
1731 goto fail;
1732 for (zap_cursor_init(&zc, mos,
1733 dsl_dataset_phys(ds)->ds_next_clones_obj);
1734 zap_cursor_retrieve(&zc, &za) == 0;
1735 zap_cursor_advance(&zc)) {
1736 dsl_dataset_t *clone;
1737 char buf[ZFS_MAXNAMELEN];
1738 VERIFY0(dsl_dataset_hold_obj(ds->ds_dir->dd_pool,
1739 za.za_first_integer, FTAG, &clone));
1740 dsl_dir_name(clone->ds_dir, buf);
1741 fnvlist_add_boolean(val, buf);
1742 dsl_dataset_rele(clone, FTAG);
1743 }
1744 zap_cursor_fini(&zc);
1745 fnvlist_add_nvlist(propval, ZPROP_VALUE, val);
1746 fnvlist_add_nvlist(nv, zfs_prop_to_name(ZFS_PROP_CLONES), propval);
1747 fail:
1748 nvlist_free(val);
1749 nvlist_free(propval);
1750 }
1751
1752 static void
get_receive_resume_stats(dsl_dataset_t * ds,nvlist_t * nv)1753 get_receive_resume_stats(dsl_dataset_t *ds, nvlist_t *nv)
1754 {
1755 dsl_pool_t *dp = ds->ds_dir->dd_pool;
1756
1757 if (dsl_dataset_has_resume_receive_state(ds)) {
1758 char *str;
1759 void *packed;
1760 uint8_t *compressed;
1761 uint64_t val;
1762 nvlist_t *token_nv = fnvlist_alloc();
1763 size_t packed_size, compressed_size;
1764
1765 if (zap_lookup(dp->dp_meta_objset, ds->ds_object,
1766 DS_FIELD_RESUME_FROMGUID, sizeof (val), 1, &val) == 0) {
1767 fnvlist_add_uint64(token_nv, "fromguid", val);
1768 }
1769 if (zap_lookup(dp->dp_meta_objset, ds->ds_object,
1770 DS_FIELD_RESUME_OBJECT, sizeof (val), 1, &val) == 0) {
1771 fnvlist_add_uint64(token_nv, "object", val);
1772 }
1773 if (zap_lookup(dp->dp_meta_objset, ds->ds_object,
1774 DS_FIELD_RESUME_OFFSET, sizeof (val), 1, &val) == 0) {
1775 fnvlist_add_uint64(token_nv, "offset", val);
1776 }
1777 if (zap_lookup(dp->dp_meta_objset, ds->ds_object,
1778 DS_FIELD_RESUME_BYTES, sizeof (val), 1, &val) == 0) {
1779 fnvlist_add_uint64(token_nv, "bytes", val);
1780 }
1781 if (zap_lookup(dp->dp_meta_objset, ds->ds_object,
1782 DS_FIELD_RESUME_TOGUID, sizeof (val), 1, &val) == 0) {
1783 fnvlist_add_uint64(token_nv, "toguid", val);
1784 }
1785 char buf[256];
1786 if (zap_lookup(dp->dp_meta_objset, ds->ds_object,
1787 DS_FIELD_RESUME_TONAME, 1, sizeof (buf), buf) == 0) {
1788 fnvlist_add_string(token_nv, "toname", buf);
1789 }
1790 if (zap_contains(dp->dp_meta_objset, ds->ds_object,
1791 DS_FIELD_RESUME_EMBEDOK) == 0) {
1792 fnvlist_add_boolean(token_nv, "embedok");
1793 }
1794 packed = fnvlist_pack(token_nv, &packed_size);
1795 fnvlist_free(token_nv);
1796 compressed = kmem_alloc(packed_size, KM_SLEEP);
1797
1798 compressed_size = gzip_compress(packed, compressed,
1799 packed_size, packed_size, 6);
1800
1801 zio_cksum_t cksum;
1802 fletcher_4_native(compressed, compressed_size, NULL, &cksum);
1803
1804 str = kmem_alloc(compressed_size * 2 + 1, KM_SLEEP);
1805 for (int i = 0; i < compressed_size; i++) {
1806 (void) sprintf(str + i * 2, "%02x", compressed[i]);
1807 }
1808 str[compressed_size * 2] = '\0';
1809 char *propval = kmem_asprintf("%u-%llx-%llx-%s",
1810 ZFS_SEND_RESUME_TOKEN_VERSION,
1811 (longlong_t)cksum.zc_word[0],
1812 (longlong_t)packed_size, str);
1813 dsl_prop_nvlist_add_string(nv,
1814 ZFS_PROP_RECEIVE_RESUME_TOKEN, propval);
1815 kmem_free(packed, packed_size);
1816 kmem_free(str, compressed_size * 2 + 1);
1817 kmem_free(compressed, packed_size);
1818 strfree(propval);
1819 }
1820 }
1821
1822 void
dsl_dataset_stats(dsl_dataset_t * ds,nvlist_t * nv)1823 dsl_dataset_stats(dsl_dataset_t *ds, nvlist_t *nv)
1824 {
1825 dsl_pool_t *dp = ds->ds_dir->dd_pool;
1826 uint64_t refd, avail, uobjs, aobjs, ratio;
1827
1828 ASSERT(dsl_pool_config_held(dp));
1829
1830 ratio = dsl_dataset_phys(ds)->ds_compressed_bytes == 0 ? 100 :
1831 (dsl_dataset_phys(ds)->ds_uncompressed_bytes * 100 /
1832 dsl_dataset_phys(ds)->ds_compressed_bytes);
1833
1834 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRATIO, ratio);
1835 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_LOGICALREFERENCED,
1836 dsl_dataset_phys(ds)->ds_uncompressed_bytes);
1837
1838 if (ds->ds_is_snapshot) {
1839 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_COMPRESSRATIO, ratio);
1840 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USED,
1841 dsl_dataset_phys(ds)->ds_unique_bytes);
1842 get_clones_stat(ds, nv);
1843 } else {
1844 if (ds->ds_prev != NULL && ds->ds_prev != dp->dp_origin_snap) {
1845 char buf[MAXNAMELEN];
1846 dsl_dataset_name(ds->ds_prev, buf);
1847 dsl_prop_nvlist_add_string(nv, ZFS_PROP_PREV_SNAP, buf);
1848 }
1849
1850 dsl_dir_stats(ds->ds_dir, nv);
1851 }
1852
1853 dsl_dataset_space(ds, &refd, &avail, &uobjs, &aobjs);
1854 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_AVAILABLE, avail);
1855 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFERENCED, refd);
1856
1857 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATION,
1858 dsl_dataset_phys(ds)->ds_creation_time);
1859 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATETXG,
1860 dsl_dataset_phys(ds)->ds_creation_txg);
1861 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFQUOTA,
1862 ds->ds_quota);
1863 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRESERVATION,
1864 ds->ds_reserved);
1865 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_GUID,
1866 dsl_dataset_phys(ds)->ds_guid);
1867 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_UNIQUE,
1868 dsl_dataset_phys(ds)->ds_unique_bytes);
1869 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_OBJSETID,
1870 ds->ds_object);
1871 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USERREFS,
1872 ds->ds_userrefs);
1873 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_DEFER_DESTROY,
1874 DS_IS_DEFER_DESTROY(ds) ? 1 : 0);
1875
1876 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) {
1877 uint64_t written, comp, uncomp;
1878 dsl_pool_t *dp = ds->ds_dir->dd_pool;
1879 dsl_dataset_t *prev;
1880
1881 int err = dsl_dataset_hold_obj(dp,
1882 dsl_dataset_phys(ds)->ds_prev_snap_obj, FTAG, &prev);
1883 if (err == 0) {
1884 err = dsl_dataset_space_written(prev, ds, &written,
1885 &comp, &uncomp);
1886 dsl_dataset_rele(prev, FTAG);
1887 if (err == 0) {
1888 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_WRITTEN,
1889 written);
1890 }
1891 }
1892 }
1893
1894 if (!dsl_dataset_is_snapshot(ds)) {
1895 /*
1896 * A failed "newfs" (e.g. full) resumable receive leaves
1897 * the stats set on this dataset. Check here for the prop.
1898 */
1899 get_receive_resume_stats(ds, nv);
1900
1901 /*
1902 * A failed incremental resumable receive leaves the
1903 * stats set on our child named "%recv". Check the child
1904 * for the prop.
1905 */
1906 char recvname[ZFS_MAXNAMELEN];
1907 dsl_dataset_t *recv_ds;
1908 dsl_dataset_name(ds, recvname);
1909 (void) strcat(recvname, "/");
1910 (void) strcat(recvname, recv_clone_name);
1911 if (dsl_dataset_hold(dp, recvname, FTAG, &recv_ds) == 0) {
1912 get_receive_resume_stats(recv_ds, nv);
1913 dsl_dataset_rele(recv_ds, FTAG);
1914 }
1915 }
1916 }
1917
1918 void
dsl_dataset_fast_stat(dsl_dataset_t * ds,dmu_objset_stats_t * stat)1919 dsl_dataset_fast_stat(dsl_dataset_t *ds, dmu_objset_stats_t *stat)
1920 {
1921 dsl_pool_t *dp = ds->ds_dir->dd_pool;
1922 ASSERT(dsl_pool_config_held(dp));
1923
1924 stat->dds_creation_txg = dsl_dataset_phys(ds)->ds_creation_txg;
1925 stat->dds_inconsistent =
1926 dsl_dataset_phys(ds)->ds_flags & DS_FLAG_INCONSISTENT;
1927 stat->dds_guid = dsl_dataset_phys(ds)->ds_guid;
1928 stat->dds_origin[0] = '\0';
1929 if (ds->ds_is_snapshot) {
1930 stat->dds_is_snapshot = B_TRUE;
1931 stat->dds_num_clones =
1932 dsl_dataset_phys(ds)->ds_num_children - 1;
1933 } else {
1934 stat->dds_is_snapshot = B_FALSE;
1935 stat->dds_num_clones = 0;
1936
1937 if (dsl_dir_is_clone(ds->ds_dir)) {
1938 dsl_dataset_t *ods;
1939
1940 VERIFY0(dsl_dataset_hold_obj(dp,
1941 dsl_dir_phys(ds->ds_dir)->dd_origin_obj,
1942 FTAG, &ods));
1943 dsl_dataset_name(ods, stat->dds_origin);
1944 dsl_dataset_rele(ods, FTAG);
1945 }
1946 }
1947 }
1948
1949 uint64_t
dsl_dataset_fsid_guid(dsl_dataset_t * ds)1950 dsl_dataset_fsid_guid(dsl_dataset_t *ds)
1951 {
1952 return (ds->ds_fsid_guid);
1953 }
1954
1955 void
dsl_dataset_space(dsl_dataset_t * ds,uint64_t * refdbytesp,uint64_t * availbytesp,uint64_t * usedobjsp,uint64_t * availobjsp)1956 dsl_dataset_space(dsl_dataset_t *ds,
1957 uint64_t *refdbytesp, uint64_t *availbytesp,
1958 uint64_t *usedobjsp, uint64_t *availobjsp)
1959 {
1960 *refdbytesp = dsl_dataset_phys(ds)->ds_referenced_bytes;
1961 *availbytesp = dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE);
1962 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes)
1963 *availbytesp +=
1964 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes;
1965 if (ds->ds_quota != 0) {
1966 /*
1967 * Adjust available bytes according to refquota
1968 */
1969 if (*refdbytesp < ds->ds_quota)
1970 *availbytesp = MIN(*availbytesp,
1971 ds->ds_quota - *refdbytesp);
1972 else
1973 *availbytesp = 0;
1974 }
1975 *usedobjsp = BP_GET_FILL(&dsl_dataset_phys(ds)->ds_bp);
1976 *availobjsp = DN_MAX_OBJECT - *usedobjsp;
1977 }
1978
1979 boolean_t
dsl_dataset_modified_since_snap(dsl_dataset_t * ds,dsl_dataset_t * snap)1980 dsl_dataset_modified_since_snap(dsl_dataset_t *ds, dsl_dataset_t *snap)
1981 {
1982 dsl_pool_t *dp = ds->ds_dir->dd_pool;
1983
1984 ASSERT(dsl_pool_config_held(dp));
1985 if (snap == NULL)
1986 return (B_FALSE);
1987 if (dsl_dataset_phys(ds)->ds_bp.blk_birth >
1988 dsl_dataset_phys(snap)->ds_creation_txg) {
1989 objset_t *os, *os_snap;
1990 /*
1991 * It may be that only the ZIL differs, because it was
1992 * reset in the head. Don't count that as being
1993 * modified.
1994 */
1995 if (dmu_objset_from_ds(ds, &os) != 0)
1996 return (B_TRUE);
1997 if (dmu_objset_from_ds(snap, &os_snap) != 0)
1998 return (B_TRUE);
1999 return (bcmp(&os->os_phys->os_meta_dnode,
2000 &os_snap->os_phys->os_meta_dnode,
2001 sizeof (os->os_phys->os_meta_dnode)) != 0);
2002 }
2003 return (B_FALSE);
2004 }
2005
2006 typedef struct dsl_dataset_rename_snapshot_arg {
2007 const char *ddrsa_fsname;
2008 const char *ddrsa_oldsnapname;
2009 const char *ddrsa_newsnapname;
2010 boolean_t ddrsa_recursive;
2011 dmu_tx_t *ddrsa_tx;
2012 } dsl_dataset_rename_snapshot_arg_t;
2013
2014 /* ARGSUSED */
2015 static int
dsl_dataset_rename_snapshot_check_impl(dsl_pool_t * dp,dsl_dataset_t * hds,void * arg)2016 dsl_dataset_rename_snapshot_check_impl(dsl_pool_t *dp,
2017 dsl_dataset_t *hds, void *arg)
2018 {
2019 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg;
2020 int error;
2021 uint64_t val;
2022
2023 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val);
2024 if (error != 0) {
2025 /* ignore nonexistent snapshots */
2026 return (error == ENOENT ? 0 : error);
2027 }
2028
2029 /* new name should not exist */
2030 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_newsnapname, &val);
2031 if (error == 0)
2032 error = SET_ERROR(EEXIST);
2033 else if (error == ENOENT)
2034 error = 0;
2035
2036 /* dataset name + 1 for the "@" + the new snapshot name must fit */
2037 if (dsl_dir_namelen(hds->ds_dir) + 1 +
2038 strlen(ddrsa->ddrsa_newsnapname) >= MAXNAMELEN)
2039 error = SET_ERROR(ENAMETOOLONG);
2040
2041 return (error);
2042 }
2043
2044 static int
dsl_dataset_rename_snapshot_check(void * arg,dmu_tx_t * tx)2045 dsl_dataset_rename_snapshot_check(void *arg, dmu_tx_t *tx)
2046 {
2047 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg;
2048 dsl_pool_t *dp = dmu_tx_pool(tx);
2049 dsl_dataset_t *hds;
2050 int error;
2051
2052 error = dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds);
2053 if (error != 0)
2054 return (error);
2055
2056 if (ddrsa->ddrsa_recursive) {
2057 error = dmu_objset_find_dp(dp, hds->ds_dir->dd_object,
2058 dsl_dataset_rename_snapshot_check_impl, ddrsa,
2059 DS_FIND_CHILDREN);
2060 } else {
2061 error = dsl_dataset_rename_snapshot_check_impl(dp, hds, ddrsa);
2062 }
2063 dsl_dataset_rele(hds, FTAG);
2064 return (error);
2065 }
2066
2067 static int
dsl_dataset_rename_snapshot_sync_impl(dsl_pool_t * dp,dsl_dataset_t * hds,void * arg)2068 dsl_dataset_rename_snapshot_sync_impl(dsl_pool_t *dp,
2069 dsl_dataset_t *hds, void *arg)
2070 {
2071 #ifdef __FreeBSD__
2072 #ifdef _KERNEL
2073 char *oldname, *newname;
2074 #endif
2075 #endif
2076 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg;
2077 dsl_dataset_t *ds;
2078 uint64_t val;
2079 dmu_tx_t *tx = ddrsa->ddrsa_tx;
2080 int error;
2081
2082 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val);
2083 ASSERT(error == 0 || error == ENOENT);
2084 if (error == ENOENT) {
2085 /* ignore nonexistent snapshots */
2086 return (0);
2087 }
2088
2089 VERIFY0(dsl_dataset_hold_obj(dp, val, FTAG, &ds));
2090
2091 /* log before we change the name */
2092 spa_history_log_internal_ds(ds, "rename", tx,
2093 "-> @%s", ddrsa->ddrsa_newsnapname);
2094
2095 VERIFY0(dsl_dataset_snap_remove(hds, ddrsa->ddrsa_oldsnapname, tx,
2096 B_FALSE));
2097 mutex_enter(&ds->ds_lock);
2098 (void) strcpy(ds->ds_snapname, ddrsa->ddrsa_newsnapname);
2099 mutex_exit(&ds->ds_lock);
2100 VERIFY0(zap_add(dp->dp_meta_objset,
2101 dsl_dataset_phys(hds)->ds_snapnames_zapobj,
2102 ds->ds_snapname, 8, 1, &ds->ds_object, tx));
2103
2104 #ifdef __FreeBSD__
2105 #ifdef _KERNEL
2106 oldname = kmem_alloc(MAXPATHLEN, KM_SLEEP);
2107 newname = kmem_alloc(MAXPATHLEN, KM_SLEEP);
2108 snprintf(oldname, MAXPATHLEN, "%s@%s", ddrsa->ddrsa_fsname,
2109 ddrsa->ddrsa_oldsnapname);
2110 snprintf(newname, MAXPATHLEN, "%s@%s", ddrsa->ddrsa_fsname,
2111 ddrsa->ddrsa_newsnapname);
2112 zfsvfs_update_fromname(oldname, newname);
2113 zvol_rename_minors(oldname, newname);
2114 kmem_free(newname, MAXPATHLEN);
2115 kmem_free(oldname, MAXPATHLEN);
2116 #endif
2117 #endif
2118 dsl_dataset_rele(ds, FTAG);
2119
2120 return (0);
2121 }
2122
2123 static void
dsl_dataset_rename_snapshot_sync(void * arg,dmu_tx_t * tx)2124 dsl_dataset_rename_snapshot_sync(void *arg, dmu_tx_t *tx)
2125 {
2126 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg;
2127 dsl_pool_t *dp = dmu_tx_pool(tx);
2128 dsl_dataset_t *hds;
2129
2130 VERIFY0(dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds));
2131 ddrsa->ddrsa_tx = tx;
2132 if (ddrsa->ddrsa_recursive) {
2133 VERIFY0(dmu_objset_find_dp(dp, hds->ds_dir->dd_object,
2134 dsl_dataset_rename_snapshot_sync_impl, ddrsa,
2135 DS_FIND_CHILDREN));
2136 } else {
2137 VERIFY0(dsl_dataset_rename_snapshot_sync_impl(dp, hds, ddrsa));
2138 }
2139 dsl_dataset_rele(hds, FTAG);
2140 }
2141
2142 int
dsl_dataset_rename_snapshot(const char * fsname,const char * oldsnapname,const char * newsnapname,boolean_t recursive)2143 dsl_dataset_rename_snapshot(const char *fsname,
2144 const char *oldsnapname, const char *newsnapname, boolean_t recursive)
2145 {
2146 dsl_dataset_rename_snapshot_arg_t ddrsa;
2147
2148 ddrsa.ddrsa_fsname = fsname;
2149 ddrsa.ddrsa_oldsnapname = oldsnapname;
2150 ddrsa.ddrsa_newsnapname = newsnapname;
2151 ddrsa.ddrsa_recursive = recursive;
2152
2153 return (dsl_sync_task(fsname, dsl_dataset_rename_snapshot_check,
2154 dsl_dataset_rename_snapshot_sync, &ddrsa,
2155 1, ZFS_SPACE_CHECK_RESERVED));
2156 }
2157
2158 /*
2159 * If we're doing an ownership handoff, we need to make sure that there is
2160 * only one long hold on the dataset. We're not allowed to change anything here
2161 * so we don't permanently release the long hold or regular hold here. We want
2162 * to do this only when syncing to avoid the dataset unexpectedly going away
2163 * when we release the long hold.
2164 */
2165 static int
dsl_dataset_handoff_check(dsl_dataset_t * ds,void * owner,dmu_tx_t * tx)2166 dsl_dataset_handoff_check(dsl_dataset_t *ds, void *owner, dmu_tx_t *tx)
2167 {
2168 boolean_t held;
2169
2170 if (!dmu_tx_is_syncing(tx))
2171 return (0);
2172
2173 if (owner != NULL) {
2174 VERIFY3P(ds->ds_owner, ==, owner);
2175 dsl_dataset_long_rele(ds, owner);
2176 }
2177
2178 held = dsl_dataset_long_held(ds);
2179
2180 if (owner != NULL)
2181 dsl_dataset_long_hold(ds, owner);
2182
2183 if (held)
2184 return (SET_ERROR(EBUSY));
2185
2186 return (0);
2187 }
2188
2189 typedef struct dsl_dataset_rollback_arg {
2190 const char *ddra_fsname;
2191 void *ddra_owner;
2192 nvlist_t *ddra_result;
2193 } dsl_dataset_rollback_arg_t;
2194
2195 static int
dsl_dataset_rollback_check(void * arg,dmu_tx_t * tx)2196 dsl_dataset_rollback_check(void *arg, dmu_tx_t *tx)
2197 {
2198 dsl_dataset_rollback_arg_t *ddra = arg;
2199 dsl_pool_t *dp = dmu_tx_pool(tx);
2200 dsl_dataset_t *ds;
2201 int64_t unused_refres_delta;
2202 int error;
2203
2204 error = dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds);
2205 if (error != 0)
2206 return (error);
2207
2208 /* must not be a snapshot */
2209 if (ds->ds_is_snapshot) {
2210 dsl_dataset_rele(ds, FTAG);
2211 return (SET_ERROR(EINVAL));
2212 }
2213
2214 /* must have a most recent snapshot */
2215 if (dsl_dataset_phys(ds)->ds_prev_snap_txg < TXG_INITIAL) {
2216 dsl_dataset_rele(ds, FTAG);
2217 return (SET_ERROR(EINVAL));
2218 }
2219
2220 /* must not have any bookmarks after the most recent snapshot */
2221 nvlist_t *proprequest = fnvlist_alloc();
2222 fnvlist_add_boolean(proprequest, zfs_prop_to_name(ZFS_PROP_CREATETXG));
2223 nvlist_t *bookmarks = fnvlist_alloc();
2224 error = dsl_get_bookmarks_impl(ds, proprequest, bookmarks);
2225 fnvlist_free(proprequest);
2226 if (error != 0)
2227 return (error);
2228 for (nvpair_t *pair = nvlist_next_nvpair(bookmarks, NULL);
2229 pair != NULL; pair = nvlist_next_nvpair(bookmarks, pair)) {
2230 nvlist_t *valuenv =
2231 fnvlist_lookup_nvlist(fnvpair_value_nvlist(pair),
2232 zfs_prop_to_name(ZFS_PROP_CREATETXG));
2233 uint64_t createtxg = fnvlist_lookup_uint64(valuenv, "value");
2234 if (createtxg > dsl_dataset_phys(ds)->ds_prev_snap_txg) {
2235 fnvlist_free(bookmarks);
2236 dsl_dataset_rele(ds, FTAG);
2237 return (SET_ERROR(EEXIST));
2238 }
2239 }
2240 fnvlist_free(bookmarks);
2241
2242 error = dsl_dataset_handoff_check(ds, ddra->ddra_owner, tx);
2243 if (error != 0) {
2244 dsl_dataset_rele(ds, FTAG);
2245 return (error);
2246 }
2247
2248 /*
2249 * Check if the snap we are rolling back to uses more than
2250 * the refquota.
2251 */
2252 if (ds->ds_quota != 0 &&
2253 dsl_dataset_phys(ds->ds_prev)->ds_referenced_bytes > ds->ds_quota) {
2254 dsl_dataset_rele(ds, FTAG);
2255 return (SET_ERROR(EDQUOT));
2256 }
2257
2258 /*
2259 * When we do the clone swap, we will temporarily use more space
2260 * due to the refreservation (the head will no longer have any
2261 * unique space, so the entire amount of the refreservation will need
2262 * to be free). We will immediately destroy the clone, freeing
2263 * this space, but the freeing happens over many txg's.
2264 */
2265 unused_refres_delta = (int64_t)MIN(ds->ds_reserved,
2266 dsl_dataset_phys(ds)->ds_unique_bytes);
2267
2268 if (unused_refres_delta > 0 &&
2269 unused_refres_delta >
2270 dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE)) {
2271 dsl_dataset_rele(ds, FTAG);
2272 return (SET_ERROR(ENOSPC));
2273 }
2274
2275 dsl_dataset_rele(ds, FTAG);
2276 return (0);
2277 }
2278
2279 static void
dsl_dataset_rollback_sync(void * arg,dmu_tx_t * tx)2280 dsl_dataset_rollback_sync(void *arg, dmu_tx_t *tx)
2281 {
2282 dsl_dataset_rollback_arg_t *ddra = arg;
2283 dsl_pool_t *dp = dmu_tx_pool(tx);
2284 dsl_dataset_t *ds, *clone;
2285 uint64_t cloneobj;
2286 char namebuf[ZFS_MAXNAMELEN];
2287
2288 VERIFY0(dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds));
2289
2290 dsl_dataset_name(ds->ds_prev, namebuf);
2291 fnvlist_add_string(ddra->ddra_result, "target", namebuf);
2292
2293 cloneobj = dsl_dataset_create_sync(ds->ds_dir, "%rollback",
2294 ds->ds_prev, DS_CREATE_FLAG_NODIRTY, kcred, tx);
2295
2296 VERIFY0(dsl_dataset_hold_obj(dp, cloneobj, FTAG, &clone));
2297
2298 dsl_dataset_clone_swap_sync_impl(clone, ds, tx);
2299 dsl_dataset_zero_zil(ds, tx);
2300
2301 dsl_destroy_head_sync_impl(clone, tx);
2302
2303 dsl_dataset_rele(clone, FTAG);
2304 dsl_dataset_rele(ds, FTAG);
2305 }
2306
2307 /*
2308 * Rolls back the given filesystem or volume to the most recent snapshot.
2309 * The name of the most recent snapshot will be returned under key "target"
2310 * in the result nvlist.
2311 *
2312 * If owner != NULL:
2313 * - The existing dataset MUST be owned by the specified owner at entry
2314 * - Upon return, dataset will still be held by the same owner, whether we
2315 * succeed or not.
2316 *
2317 * This mode is required any time the existing filesystem is mounted. See
2318 * notes above zfs_suspend_fs() for further details.
2319 */
2320 int
dsl_dataset_rollback(const char * fsname,void * owner,nvlist_t * result)2321 dsl_dataset_rollback(const char *fsname, void *owner, nvlist_t *result)
2322 {
2323 dsl_dataset_rollback_arg_t ddra;
2324
2325 ddra.ddra_fsname = fsname;
2326 ddra.ddra_owner = owner;
2327 ddra.ddra_result = result;
2328
2329 return (dsl_sync_task(fsname, dsl_dataset_rollback_check,
2330 dsl_dataset_rollback_sync, &ddra,
2331 1, ZFS_SPACE_CHECK_RESERVED));
2332 }
2333
2334 struct promotenode {
2335 list_node_t link;
2336 dsl_dataset_t *ds;
2337 };
2338
2339 typedef struct dsl_dataset_promote_arg {
2340 const char *ddpa_clonename;
2341 dsl_dataset_t *ddpa_clone;
2342 list_t shared_snaps, origin_snaps, clone_snaps;
2343 dsl_dataset_t *origin_origin; /* origin of the origin */
2344 uint64_t used, comp, uncomp, unique, cloneusedsnap, originusedsnap;
2345 char *err_ds;
2346 cred_t *cr;
2347 } dsl_dataset_promote_arg_t;
2348
2349 static int snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep);
2350 static int promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp,
2351 void *tag);
2352 static void promote_rele(dsl_dataset_promote_arg_t *ddpa, void *tag);
2353
2354 static int
dsl_dataset_promote_check(void * arg,dmu_tx_t * tx)2355 dsl_dataset_promote_check(void *arg, dmu_tx_t *tx)
2356 {
2357 dsl_dataset_promote_arg_t *ddpa = arg;
2358 dsl_pool_t *dp = dmu_tx_pool(tx);
2359 dsl_dataset_t *hds;
2360 struct promotenode *snap;
2361 dsl_dataset_t *origin_ds;
2362 int err;
2363 uint64_t unused;
2364 uint64_t ss_mv_cnt;
2365 size_t max_snap_len;
2366
2367 err = promote_hold(ddpa, dp, FTAG);
2368 if (err != 0)
2369 return (err);
2370
2371 hds = ddpa->ddpa_clone;
2372 max_snap_len = MAXNAMELEN - strlen(ddpa->ddpa_clonename) - 1;
2373
2374 if (dsl_dataset_phys(hds)->ds_flags & DS_FLAG_NOPROMOTE) {
2375 promote_rele(ddpa, FTAG);
2376 return (SET_ERROR(EXDEV));
2377 }
2378
2379 /*
2380 * Compute and check the amount of space to transfer. Since this is
2381 * so expensive, don't do the preliminary check.
2382 */
2383 if (!dmu_tx_is_syncing(tx)) {
2384 promote_rele(ddpa, FTAG);
2385 return (0);
2386 }
2387
2388 snap = list_head(&ddpa->shared_snaps);
2389 origin_ds = snap->ds;
2390
2391 /* compute origin's new unique space */
2392 snap = list_tail(&ddpa->clone_snaps);
2393 ASSERT3U(dsl_dataset_phys(snap->ds)->ds_prev_snap_obj, ==,
2394 origin_ds->ds_object);
2395 dsl_deadlist_space_range(&snap->ds->ds_deadlist,
2396 dsl_dataset_phys(origin_ds)->ds_prev_snap_txg, UINT64_MAX,
2397 &ddpa->unique, &unused, &unused);
2398
2399 /*
2400 * Walk the snapshots that we are moving
2401 *
2402 * Compute space to transfer. Consider the incremental changes
2403 * to used by each snapshot:
2404 * (my used) = (prev's used) + (blocks born) - (blocks killed)
2405 * So each snapshot gave birth to:
2406 * (blocks born) = (my used) - (prev's used) + (blocks killed)
2407 * So a sequence would look like:
2408 * (uN - u(N-1) + kN) + ... + (u1 - u0 + k1) + (u0 - 0 + k0)
2409 * Which simplifies to:
2410 * uN + kN + kN-1 + ... + k1 + k0
2411 * Note however, if we stop before we reach the ORIGIN we get:
2412 * uN + kN + kN-1 + ... + kM - uM-1
2413 */
2414 ss_mv_cnt = 0;
2415 ddpa->used = dsl_dataset_phys(origin_ds)->ds_referenced_bytes;
2416 ddpa->comp = dsl_dataset_phys(origin_ds)->ds_compressed_bytes;
2417 ddpa->uncomp = dsl_dataset_phys(origin_ds)->ds_uncompressed_bytes;
2418 for (snap = list_head(&ddpa->shared_snaps); snap;
2419 snap = list_next(&ddpa->shared_snaps, snap)) {
2420 uint64_t val, dlused, dlcomp, dluncomp;
2421 dsl_dataset_t *ds = snap->ds;
2422
2423 ss_mv_cnt++;
2424
2425 /*
2426 * If there are long holds, we won't be able to evict
2427 * the objset.
2428 */
2429 if (dsl_dataset_long_held(ds)) {
2430 err = SET_ERROR(EBUSY);
2431 goto out;
2432 }
2433
2434 /* Check that the snapshot name does not conflict */
2435 VERIFY0(dsl_dataset_get_snapname(ds));
2436 if (strlen(ds->ds_snapname) >= max_snap_len) {
2437 err = SET_ERROR(ENAMETOOLONG);
2438 goto out;
2439 }
2440 err = dsl_dataset_snap_lookup(hds, ds->ds_snapname, &val);
2441 if (err == 0) {
2442 (void) strcpy(ddpa->err_ds, snap->ds->ds_snapname);
2443 err = SET_ERROR(EEXIST);
2444 goto out;
2445 }
2446 if (err != ENOENT)
2447 goto out;
2448
2449 /* The very first snapshot does not have a deadlist */
2450 if (dsl_dataset_phys(ds)->ds_prev_snap_obj == 0)
2451 continue;
2452
2453 dsl_deadlist_space(&ds->ds_deadlist,
2454 &dlused, &dlcomp, &dluncomp);
2455 ddpa->used += dlused;
2456 ddpa->comp += dlcomp;
2457 ddpa->uncomp += dluncomp;
2458 }
2459
2460 /*
2461 * If we are a clone of a clone then we never reached ORIGIN,
2462 * so we need to subtract out the clone origin's used space.
2463 */
2464 if (ddpa->origin_origin) {
2465 ddpa->used -=
2466 dsl_dataset_phys(ddpa->origin_origin)->ds_referenced_bytes;
2467 ddpa->comp -=
2468 dsl_dataset_phys(ddpa->origin_origin)->ds_compressed_bytes;
2469 ddpa->uncomp -=
2470 dsl_dataset_phys(ddpa->origin_origin)->
2471 ds_uncompressed_bytes;
2472 }
2473
2474 /* Check that there is enough space and limit headroom here */
2475 err = dsl_dir_transfer_possible(origin_ds->ds_dir, hds->ds_dir,
2476 0, ss_mv_cnt, ddpa->used, ddpa->cr);
2477 if (err != 0)
2478 goto out;
2479
2480 /*
2481 * Compute the amounts of space that will be used by snapshots
2482 * after the promotion (for both origin and clone). For each,
2483 * it is the amount of space that will be on all of their
2484 * deadlists (that was not born before their new origin).
2485 */
2486 if (dsl_dir_phys(hds->ds_dir)->dd_flags & DD_FLAG_USED_BREAKDOWN) {
2487 uint64_t space;
2488
2489 /*
2490 * Note, typically this will not be a clone of a clone,
2491 * so dd_origin_txg will be < TXG_INITIAL, so
2492 * these snaplist_space() -> dsl_deadlist_space_range()
2493 * calls will be fast because they do not have to
2494 * iterate over all bps.
2495 */
2496 snap = list_head(&ddpa->origin_snaps);
2497 err = snaplist_space(&ddpa->shared_snaps,
2498 snap->ds->ds_dir->dd_origin_txg, &ddpa->cloneusedsnap);
2499 if (err != 0)
2500 goto out;
2501
2502 err = snaplist_space(&ddpa->clone_snaps,
2503 snap->ds->ds_dir->dd_origin_txg, &space);
2504 if (err != 0)
2505 goto out;
2506 ddpa->cloneusedsnap += space;
2507 }
2508 if (dsl_dir_phys(origin_ds->ds_dir)->dd_flags &
2509 DD_FLAG_USED_BREAKDOWN) {
2510 err = snaplist_space(&ddpa->origin_snaps,
2511 dsl_dataset_phys(origin_ds)->ds_creation_txg,
2512 &ddpa->originusedsnap);
2513 if (err != 0)
2514 goto out;
2515 }
2516
2517 out:
2518 promote_rele(ddpa, FTAG);
2519 return (err);
2520 }
2521
2522 static void
dsl_dataset_promote_sync(void * arg,dmu_tx_t * tx)2523 dsl_dataset_promote_sync(void *arg, dmu_tx_t *tx)
2524 {
2525 dsl_dataset_promote_arg_t *ddpa = arg;
2526 dsl_pool_t *dp = dmu_tx_pool(tx);
2527 dsl_dataset_t *hds;
2528 struct promotenode *snap;
2529 dsl_dataset_t *origin_ds;
2530 dsl_dataset_t *origin_head;
2531 dsl_dir_t *dd;
2532 dsl_dir_t *odd = NULL;
2533 uint64_t oldnext_obj;
2534 int64_t delta;
2535 #if defined(__FreeBSD__) && defined(_KERNEL)
2536 char *oldname, *newname;
2537 #endif
2538
2539 VERIFY0(promote_hold(ddpa, dp, FTAG));
2540 hds = ddpa->ddpa_clone;
2541
2542 ASSERT0(dsl_dataset_phys(hds)->ds_flags & DS_FLAG_NOPROMOTE);
2543
2544 snap = list_head(&ddpa->shared_snaps);
2545 origin_ds = snap->ds;
2546 dd = hds->ds_dir;
2547
2548 snap = list_head(&ddpa->origin_snaps);
2549 origin_head = snap->ds;
2550
2551 /*
2552 * We need to explicitly open odd, since origin_ds's dd will be
2553 * changing.
2554 */
2555 VERIFY0(dsl_dir_hold_obj(dp, origin_ds->ds_dir->dd_object,
2556 NULL, FTAG, &odd));
2557
2558 /* change origin's next snap */
2559 dmu_buf_will_dirty(origin_ds->ds_dbuf, tx);
2560 oldnext_obj = dsl_dataset_phys(origin_ds)->ds_next_snap_obj;
2561 snap = list_tail(&ddpa->clone_snaps);
2562 ASSERT3U(dsl_dataset_phys(snap->ds)->ds_prev_snap_obj, ==,
2563 origin_ds->ds_object);
2564 dsl_dataset_phys(origin_ds)->ds_next_snap_obj = snap->ds->ds_object;
2565
2566 /* change the origin's next clone */
2567 if (dsl_dataset_phys(origin_ds)->ds_next_clones_obj) {
2568 dsl_dataset_remove_from_next_clones(origin_ds,
2569 snap->ds->ds_object, tx);
2570 VERIFY0(zap_add_int(dp->dp_meta_objset,
2571 dsl_dataset_phys(origin_ds)->ds_next_clones_obj,
2572 oldnext_obj, tx));
2573 }
2574
2575 /* change origin */
2576 dmu_buf_will_dirty(dd->dd_dbuf, tx);
2577 ASSERT3U(dsl_dir_phys(dd)->dd_origin_obj, ==, origin_ds->ds_object);
2578 dsl_dir_phys(dd)->dd_origin_obj = dsl_dir_phys(odd)->dd_origin_obj;
2579 dd->dd_origin_txg = origin_head->ds_dir->dd_origin_txg;
2580 dmu_buf_will_dirty(odd->dd_dbuf, tx);
2581 dsl_dir_phys(odd)->dd_origin_obj = origin_ds->ds_object;
2582 origin_head->ds_dir->dd_origin_txg =
2583 dsl_dataset_phys(origin_ds)->ds_creation_txg;
2584
2585 /* change dd_clone entries */
2586 if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) {
2587 VERIFY0(zap_remove_int(dp->dp_meta_objset,
2588 dsl_dir_phys(odd)->dd_clones, hds->ds_object, tx));
2589 VERIFY0(zap_add_int(dp->dp_meta_objset,
2590 dsl_dir_phys(ddpa->origin_origin->ds_dir)->dd_clones,
2591 hds->ds_object, tx));
2592
2593 VERIFY0(zap_remove_int(dp->dp_meta_objset,
2594 dsl_dir_phys(ddpa->origin_origin->ds_dir)->dd_clones,
2595 origin_head->ds_object, tx));
2596 if (dsl_dir_phys(dd)->dd_clones == 0) {
2597 dsl_dir_phys(dd)->dd_clones =
2598 zap_create(dp->dp_meta_objset, DMU_OT_DSL_CLONES,
2599 DMU_OT_NONE, 0, tx);
2600 }
2601 VERIFY0(zap_add_int(dp->dp_meta_objset,
2602 dsl_dir_phys(dd)->dd_clones, origin_head->ds_object, tx));
2603 }
2604
2605 #if defined(__FreeBSD__) && defined(_KERNEL)
2606 /* Take the spa_namespace_lock early so zvol renames don't deadlock. */
2607 mutex_enter(&spa_namespace_lock);
2608
2609 oldname = kmem_alloc(MAXPATHLEN, KM_SLEEP);
2610 newname = kmem_alloc(MAXPATHLEN, KM_SLEEP);
2611 #endif
2612
2613 /* move snapshots to this dir */
2614 for (snap = list_head(&ddpa->shared_snaps); snap;
2615 snap = list_next(&ddpa->shared_snaps, snap)) {
2616 dsl_dataset_t *ds = snap->ds;
2617
2618 /*
2619 * Property callbacks are registered to a particular
2620 * dsl_dir. Since ours is changing, evict the objset
2621 * so that they will be unregistered from the old dsl_dir.
2622 */
2623 if (ds->ds_objset) {
2624 dmu_objset_evict(ds->ds_objset);
2625 ds->ds_objset = NULL;
2626 }
2627
2628 /* move snap name entry */
2629 VERIFY0(dsl_dataset_get_snapname(ds));
2630 VERIFY0(dsl_dataset_snap_remove(origin_head,
2631 ds->ds_snapname, tx, B_TRUE));
2632 VERIFY0(zap_add(dp->dp_meta_objset,
2633 dsl_dataset_phys(hds)->ds_snapnames_zapobj, ds->ds_snapname,
2634 8, 1, &ds->ds_object, tx));
2635 dsl_fs_ss_count_adjust(hds->ds_dir, 1,
2636 DD_FIELD_SNAPSHOT_COUNT, tx);
2637
2638 /* change containing dsl_dir */
2639 dmu_buf_will_dirty(ds->ds_dbuf, tx);
2640 ASSERT3U(dsl_dataset_phys(ds)->ds_dir_obj, ==, odd->dd_object);
2641 dsl_dataset_phys(ds)->ds_dir_obj = dd->dd_object;
2642 ASSERT3P(ds->ds_dir, ==, odd);
2643 dsl_dir_rele(ds->ds_dir, ds);
2644 VERIFY0(dsl_dir_hold_obj(dp, dd->dd_object,
2645 NULL, ds, &ds->ds_dir));
2646
2647 #if defined(__FreeBSD__) && defined(_KERNEL)
2648 dsl_dataset_name(ds, newname);
2649 zfsvfs_update_fromname(oldname, newname);
2650 zvol_rename_minors(oldname, newname);
2651 #endif
2652
2653 /* move any clone references */
2654 if (dsl_dataset_phys(ds)->ds_next_clones_obj &&
2655 spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) {
2656 zap_cursor_t zc;
2657 zap_attribute_t za;
2658
2659 for (zap_cursor_init(&zc, dp->dp_meta_objset,
2660 dsl_dataset_phys(ds)->ds_next_clones_obj);
2661 zap_cursor_retrieve(&zc, &za) == 0;
2662 zap_cursor_advance(&zc)) {
2663 dsl_dataset_t *cnds;
2664 uint64_t o;
2665
2666 if (za.za_first_integer == oldnext_obj) {
2667 /*
2668 * We've already moved the
2669 * origin's reference.
2670 */
2671 continue;
2672 }
2673
2674 VERIFY0(dsl_dataset_hold_obj(dp,
2675 za.za_first_integer, FTAG, &cnds));
2676 o = dsl_dir_phys(cnds->ds_dir)->
2677 dd_head_dataset_obj;
2678
2679 VERIFY0(zap_remove_int(dp->dp_meta_objset,
2680 dsl_dir_phys(odd)->dd_clones, o, tx));
2681 VERIFY0(zap_add_int(dp->dp_meta_objset,
2682 dsl_dir_phys(dd)->dd_clones, o, tx));
2683 dsl_dataset_rele(cnds, FTAG);
2684 }
2685 zap_cursor_fini(&zc);
2686 }
2687
2688 ASSERT(!dsl_prop_hascb(ds));
2689 }
2690
2691 #if defined(__FreeBSD__) && defined(_KERNEL)
2692 mutex_exit(&spa_namespace_lock);
2693
2694 kmem_free(newname, MAXPATHLEN);
2695 kmem_free(oldname, MAXPATHLEN);
2696 #endif
2697 /*
2698 * Change space accounting.
2699 * Note, pa->*usedsnap and dd_used_breakdown[SNAP] will either
2700 * both be valid, or both be 0 (resulting in delta == 0). This
2701 * is true for each of {clone,origin} independently.
2702 */
2703
2704 delta = ddpa->cloneusedsnap -
2705 dsl_dir_phys(dd)->dd_used_breakdown[DD_USED_SNAP];
2706 ASSERT3S(delta, >=, 0);
2707 ASSERT3U(ddpa->used, >=, delta);
2708 dsl_dir_diduse_space(dd, DD_USED_SNAP, delta, 0, 0, tx);
2709 dsl_dir_diduse_space(dd, DD_USED_HEAD,
2710 ddpa->used - delta, ddpa->comp, ddpa->uncomp, tx);
2711
2712 delta = ddpa->originusedsnap -
2713 dsl_dir_phys(odd)->dd_used_breakdown[DD_USED_SNAP];
2714 ASSERT3S(delta, <=, 0);
2715 ASSERT3U(ddpa->used, >=, -delta);
2716 dsl_dir_diduse_space(odd, DD_USED_SNAP, delta, 0, 0, tx);
2717 dsl_dir_diduse_space(odd, DD_USED_HEAD,
2718 -ddpa->used - delta, -ddpa->comp, -ddpa->uncomp, tx);
2719
2720 dsl_dataset_phys(origin_ds)->ds_unique_bytes = ddpa->unique;
2721
2722 /* log history record */
2723 spa_history_log_internal_ds(hds, "promote", tx, "");
2724
2725 dsl_dir_rele(odd, FTAG);
2726 promote_rele(ddpa, FTAG);
2727 }
2728
2729 /*
2730 * Make a list of dsl_dataset_t's for the snapshots between first_obj
2731 * (exclusive) and last_obj (inclusive). The list will be in reverse
2732 * order (last_obj will be the list_head()). If first_obj == 0, do all
2733 * snapshots back to this dataset's origin.
2734 */
2735 static int
snaplist_make(dsl_pool_t * dp,uint64_t first_obj,uint64_t last_obj,list_t * l,void * tag)2736 snaplist_make(dsl_pool_t *dp,
2737 uint64_t first_obj, uint64_t last_obj, list_t *l, void *tag)
2738 {
2739 uint64_t obj = last_obj;
2740
2741 list_create(l, sizeof (struct promotenode),
2742 offsetof(struct promotenode, link));
2743
2744 while (obj != first_obj) {
2745 dsl_dataset_t *ds;
2746 struct promotenode *snap;
2747 int err;
2748
2749 err = dsl_dataset_hold_obj(dp, obj, tag, &ds);
2750 ASSERT(err != ENOENT);
2751 if (err != 0)
2752 return (err);
2753
2754 if (first_obj == 0)
2755 first_obj = dsl_dir_phys(ds->ds_dir)->dd_origin_obj;
2756
2757 snap = kmem_alloc(sizeof (*snap), KM_SLEEP);
2758 snap->ds = ds;
2759 list_insert_tail(l, snap);
2760 obj = dsl_dataset_phys(ds)->ds_prev_snap_obj;
2761 }
2762
2763 return (0);
2764 }
2765
2766 static int
snaplist_space(list_t * l,uint64_t mintxg,uint64_t * spacep)2767 snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep)
2768 {
2769 struct promotenode *snap;
2770
2771 *spacep = 0;
2772 for (snap = list_head(l); snap; snap = list_next(l, snap)) {
2773 uint64_t used, comp, uncomp;
2774 dsl_deadlist_space_range(&snap->ds->ds_deadlist,
2775 mintxg, UINT64_MAX, &used, &comp, &uncomp);
2776 *spacep += used;
2777 }
2778 return (0);
2779 }
2780
2781 static void
snaplist_destroy(list_t * l,void * tag)2782 snaplist_destroy(list_t *l, void *tag)
2783 {
2784 struct promotenode *snap;
2785
2786 if (l == NULL || !list_link_active(&l->list_head))
2787 return;
2788
2789 while ((snap = list_tail(l)) != NULL) {
2790 list_remove(l, snap);
2791 dsl_dataset_rele(snap->ds, tag);
2792 kmem_free(snap, sizeof (*snap));
2793 }
2794 list_destroy(l);
2795 }
2796
2797 static int
promote_hold(dsl_dataset_promote_arg_t * ddpa,dsl_pool_t * dp,void * tag)2798 promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp, void *tag)
2799 {
2800 int error;
2801 dsl_dir_t *dd;
2802 struct promotenode *snap;
2803
2804 error = dsl_dataset_hold(dp, ddpa->ddpa_clonename, tag,
2805 &ddpa->ddpa_clone);
2806 if (error != 0)
2807 return (error);
2808 dd = ddpa->ddpa_clone->ds_dir;
2809
2810 if (ddpa->ddpa_clone->ds_is_snapshot ||
2811 !dsl_dir_is_clone(dd)) {
2812 dsl_dataset_rele(ddpa->ddpa_clone, tag);
2813 return (SET_ERROR(EINVAL));
2814 }
2815
2816 error = snaplist_make(dp, 0, dsl_dir_phys(dd)->dd_origin_obj,
2817 &ddpa->shared_snaps, tag);
2818 if (error != 0)
2819 goto out;
2820
2821 error = snaplist_make(dp, 0, ddpa->ddpa_clone->ds_object,
2822 &ddpa->clone_snaps, tag);
2823 if (error != 0)
2824 goto out;
2825
2826 snap = list_head(&ddpa->shared_snaps);
2827 ASSERT3U(snap->ds->ds_object, ==, dsl_dir_phys(dd)->dd_origin_obj);
2828 error = snaplist_make(dp, dsl_dir_phys(dd)->dd_origin_obj,
2829 dsl_dir_phys(snap->ds->ds_dir)->dd_head_dataset_obj,
2830 &ddpa->origin_snaps, tag);
2831 if (error != 0)
2832 goto out;
2833
2834 if (dsl_dir_phys(snap->ds->ds_dir)->dd_origin_obj != 0) {
2835 error = dsl_dataset_hold_obj(dp,
2836 dsl_dir_phys(snap->ds->ds_dir)->dd_origin_obj,
2837 tag, &ddpa->origin_origin);
2838 if (error != 0)
2839 goto out;
2840 }
2841 out:
2842 if (error != 0)
2843 promote_rele(ddpa, tag);
2844 return (error);
2845 }
2846
2847 static void
promote_rele(dsl_dataset_promote_arg_t * ddpa,void * tag)2848 promote_rele(dsl_dataset_promote_arg_t *ddpa, void *tag)
2849 {
2850 snaplist_destroy(&ddpa->shared_snaps, tag);
2851 snaplist_destroy(&ddpa->clone_snaps, tag);
2852 snaplist_destroy(&ddpa->origin_snaps, tag);
2853 if (ddpa->origin_origin != NULL)
2854 dsl_dataset_rele(ddpa->origin_origin, tag);
2855 dsl_dataset_rele(ddpa->ddpa_clone, tag);
2856 }
2857
2858 /*
2859 * Promote a clone.
2860 *
2861 * If it fails due to a conflicting snapshot name, "conflsnap" will be filled
2862 * in with the name. (It must be at least MAXNAMELEN bytes long.)
2863 */
2864 int
dsl_dataset_promote(const char * name,char * conflsnap)2865 dsl_dataset_promote(const char *name, char *conflsnap)
2866 {
2867 dsl_dataset_promote_arg_t ddpa = { 0 };
2868 uint64_t numsnaps;
2869 int error;
2870 objset_t *os;
2871
2872 /*
2873 * We will modify space proportional to the number of
2874 * snapshots. Compute numsnaps.
2875 */
2876 error = dmu_objset_hold(name, FTAG, &os);
2877 if (error != 0)
2878 return (error);
2879 error = zap_count(dmu_objset_pool(os)->dp_meta_objset,
2880 dsl_dataset_phys(dmu_objset_ds(os))->ds_snapnames_zapobj,
2881 &numsnaps);
2882 dmu_objset_rele(os, FTAG);
2883 if (error != 0)
2884 return (error);
2885
2886 ddpa.ddpa_clonename = name;
2887 ddpa.err_ds = conflsnap;
2888 ddpa.cr = CRED();
2889
2890 return (dsl_sync_task(name, dsl_dataset_promote_check,
2891 dsl_dataset_promote_sync, &ddpa,
2892 2 + numsnaps, ZFS_SPACE_CHECK_RESERVED));
2893 }
2894
2895 int
dsl_dataset_clone_swap_check_impl(dsl_dataset_t * clone,dsl_dataset_t * origin_head,boolean_t force,void * owner,dmu_tx_t * tx)2896 dsl_dataset_clone_swap_check_impl(dsl_dataset_t *clone,
2897 dsl_dataset_t *origin_head, boolean_t force, void *owner, dmu_tx_t *tx)
2898 {
2899 int64_t unused_refres_delta;
2900
2901 /* they should both be heads */
2902 if (clone->ds_is_snapshot ||
2903 origin_head->ds_is_snapshot)
2904 return (SET_ERROR(EINVAL));
2905
2906 /* if we are not forcing, the branch point should be just before them */
2907 if (!force && clone->ds_prev != origin_head->ds_prev)
2908 return (SET_ERROR(EINVAL));
2909
2910 /* clone should be the clone (unless they are unrelated) */
2911 if (clone->ds_prev != NULL &&
2912 clone->ds_prev != clone->ds_dir->dd_pool->dp_origin_snap &&
2913 origin_head->ds_dir != clone->ds_prev->ds_dir)
2914 return (SET_ERROR(EINVAL));
2915
2916 /* the clone should be a child of the origin */
2917 if (clone->ds_dir->dd_parent != origin_head->ds_dir)
2918 return (SET_ERROR(EINVAL));
2919
2920 /* origin_head shouldn't be modified unless 'force' */
2921 if (!force &&
2922 dsl_dataset_modified_since_snap(origin_head, origin_head->ds_prev))
2923 return (SET_ERROR(ETXTBSY));
2924
2925 /* origin_head should have no long holds (e.g. is not mounted) */
2926 if (dsl_dataset_handoff_check(origin_head, owner, tx))
2927 return (SET_ERROR(EBUSY));
2928
2929 /* check amount of any unconsumed refreservation */
2930 unused_refres_delta =
2931 (int64_t)MIN(origin_head->ds_reserved,
2932 dsl_dataset_phys(origin_head)->ds_unique_bytes) -
2933 (int64_t)MIN(origin_head->ds_reserved,
2934 dsl_dataset_phys(clone)->ds_unique_bytes);
2935
2936 if (unused_refres_delta > 0 &&
2937 unused_refres_delta >
2938 dsl_dir_space_available(origin_head->ds_dir, NULL, 0, TRUE))
2939 return (SET_ERROR(ENOSPC));
2940
2941 /* clone can't be over the head's refquota */
2942 if (origin_head->ds_quota != 0 &&
2943 dsl_dataset_phys(clone)->ds_referenced_bytes >
2944 origin_head->ds_quota)
2945 return (SET_ERROR(EDQUOT));
2946
2947 return (0);
2948 }
2949
2950 void
dsl_dataset_clone_swap_sync_impl(dsl_dataset_t * clone,dsl_dataset_t * origin_head,dmu_tx_t * tx)2951 dsl_dataset_clone_swap_sync_impl(dsl_dataset_t *clone,
2952 dsl_dataset_t *origin_head, dmu_tx_t *tx)
2953 {
2954 dsl_pool_t *dp = dmu_tx_pool(tx);
2955 int64_t unused_refres_delta;
2956
2957 ASSERT(clone->ds_reserved == 0);
2958 ASSERT(origin_head->ds_quota == 0 ||
2959 dsl_dataset_phys(clone)->ds_unique_bytes <= origin_head->ds_quota);
2960 ASSERT3P(clone->ds_prev, ==, origin_head->ds_prev);
2961
2962 /*
2963 * Swap per-dataset feature flags.
2964 */
2965 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) {
2966 if (!(spa_feature_table[f].fi_flags &
2967 ZFEATURE_FLAG_PER_DATASET)) {
2968 ASSERT(!clone->ds_feature_inuse[f]);
2969 ASSERT(!origin_head->ds_feature_inuse[f]);
2970 continue;
2971 }
2972
2973 boolean_t clone_inuse = clone->ds_feature_inuse[f];
2974 boolean_t origin_head_inuse = origin_head->ds_feature_inuse[f];
2975
2976 if (clone_inuse) {
2977 dsl_dataset_deactivate_feature(clone->ds_object, f, tx);
2978 clone->ds_feature_inuse[f] = B_FALSE;
2979 }
2980 if (origin_head_inuse) {
2981 dsl_dataset_deactivate_feature(origin_head->ds_object,
2982 f, tx);
2983 origin_head->ds_feature_inuse[f] = B_FALSE;
2984 }
2985 if (clone_inuse) {
2986 dsl_dataset_activate_feature(origin_head->ds_object,
2987 f, tx);
2988 origin_head->ds_feature_inuse[f] = B_TRUE;
2989 }
2990 if (origin_head_inuse) {
2991 dsl_dataset_activate_feature(clone->ds_object, f, tx);
2992 clone->ds_feature_inuse[f] = B_TRUE;
2993 }
2994 }
2995
2996 dmu_buf_will_dirty(clone->ds_dbuf, tx);
2997 dmu_buf_will_dirty(origin_head->ds_dbuf, tx);
2998
2999 if (clone->ds_objset != NULL) {
3000 dmu_objset_evict(clone->ds_objset);
3001 clone->ds_objset = NULL;
3002 }
3003
3004 if (origin_head->ds_objset != NULL) {
3005 dmu_objset_evict(origin_head->ds_objset);
3006 origin_head->ds_objset = NULL;
3007 }
3008
3009 unused_refres_delta =
3010 (int64_t)MIN(origin_head->ds_reserved,
3011 dsl_dataset_phys(origin_head)->ds_unique_bytes) -
3012 (int64_t)MIN(origin_head->ds_reserved,
3013 dsl_dataset_phys(clone)->ds_unique_bytes);
3014
3015 /*
3016 * Reset origin's unique bytes, if it exists.
3017 */
3018 if (clone->ds_prev) {
3019 dsl_dataset_t *origin = clone->ds_prev;
3020 uint64_t comp, uncomp;
3021
3022 dmu_buf_will_dirty(origin->ds_dbuf, tx);
3023 dsl_deadlist_space_range(&clone->ds_deadlist,
3024 dsl_dataset_phys(origin)->ds_prev_snap_txg, UINT64_MAX,
3025 &dsl_dataset_phys(origin)->ds_unique_bytes, &comp, &uncomp);
3026 }
3027
3028 /* swap blkptrs */
3029 {
3030 blkptr_t tmp;
3031 tmp = dsl_dataset_phys(origin_head)->ds_bp;
3032 dsl_dataset_phys(origin_head)->ds_bp =
3033 dsl_dataset_phys(clone)->ds_bp;
3034 dsl_dataset_phys(clone)->ds_bp = tmp;
3035 }
3036
3037 /* set dd_*_bytes */
3038 {
3039 int64_t dused, dcomp, duncomp;
3040 uint64_t cdl_used, cdl_comp, cdl_uncomp;
3041 uint64_t odl_used, odl_comp, odl_uncomp;
3042
3043 ASSERT3U(dsl_dir_phys(clone->ds_dir)->
3044 dd_used_breakdown[DD_USED_SNAP], ==, 0);
3045
3046 dsl_deadlist_space(&clone->ds_deadlist,
3047 &cdl_used, &cdl_comp, &cdl_uncomp);
3048 dsl_deadlist_space(&origin_head->ds_deadlist,
3049 &odl_used, &odl_comp, &odl_uncomp);
3050
3051 dused = dsl_dataset_phys(clone)->ds_referenced_bytes +
3052 cdl_used -
3053 (dsl_dataset_phys(origin_head)->ds_referenced_bytes +
3054 odl_used);
3055 dcomp = dsl_dataset_phys(clone)->ds_compressed_bytes +
3056 cdl_comp -
3057 (dsl_dataset_phys(origin_head)->ds_compressed_bytes +
3058 odl_comp);
3059 duncomp = dsl_dataset_phys(clone)->ds_uncompressed_bytes +
3060 cdl_uncomp -
3061 (dsl_dataset_phys(origin_head)->ds_uncompressed_bytes +
3062 odl_uncomp);
3063
3064 dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_HEAD,
3065 dused, dcomp, duncomp, tx);
3066 dsl_dir_diduse_space(clone->ds_dir, DD_USED_HEAD,
3067 -dused, -dcomp, -duncomp, tx);
3068
3069 /*
3070 * The difference in the space used by snapshots is the
3071 * difference in snapshot space due to the head's
3072 * deadlist (since that's the only thing that's
3073 * changing that affects the snapused).
3074 */
3075 dsl_deadlist_space_range(&clone->ds_deadlist,
3076 origin_head->ds_dir->dd_origin_txg, UINT64_MAX,
3077 &cdl_used, &cdl_comp, &cdl_uncomp);
3078 dsl_deadlist_space_range(&origin_head->ds_deadlist,
3079 origin_head->ds_dir->dd_origin_txg, UINT64_MAX,
3080 &odl_used, &odl_comp, &odl_uncomp);
3081 dsl_dir_transfer_space(origin_head->ds_dir, cdl_used - odl_used,
3082 DD_USED_HEAD, DD_USED_SNAP, NULL);
3083 }
3084
3085 /* swap ds_*_bytes */
3086 SWITCH64(dsl_dataset_phys(origin_head)->ds_referenced_bytes,
3087 dsl_dataset_phys(clone)->ds_referenced_bytes);
3088 SWITCH64(dsl_dataset_phys(origin_head)->ds_compressed_bytes,
3089 dsl_dataset_phys(clone)->ds_compressed_bytes);
3090 SWITCH64(dsl_dataset_phys(origin_head)->ds_uncompressed_bytes,
3091 dsl_dataset_phys(clone)->ds_uncompressed_bytes);
3092 SWITCH64(dsl_dataset_phys(origin_head)->ds_unique_bytes,
3093 dsl_dataset_phys(clone)->ds_unique_bytes);
3094
3095 /* apply any parent delta for change in unconsumed refreservation */
3096 dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_REFRSRV,
3097 unused_refres_delta, 0, 0, tx);
3098
3099 /*
3100 * Swap deadlists.
3101 */
3102 dsl_deadlist_close(&clone->ds_deadlist);
3103 dsl_deadlist_close(&origin_head->ds_deadlist);
3104 SWITCH64(dsl_dataset_phys(origin_head)->ds_deadlist_obj,
3105 dsl_dataset_phys(clone)->ds_deadlist_obj);
3106 dsl_deadlist_open(&clone->ds_deadlist, dp->dp_meta_objset,
3107 dsl_dataset_phys(clone)->ds_deadlist_obj);
3108 dsl_deadlist_open(&origin_head->ds_deadlist, dp->dp_meta_objset,
3109 dsl_dataset_phys(origin_head)->ds_deadlist_obj);
3110
3111 dsl_scan_ds_clone_swapped(origin_head, clone, tx);
3112
3113 spa_history_log_internal_ds(clone, "clone swap", tx,
3114 "parent=%s", origin_head->ds_dir->dd_myname);
3115 }
3116
3117 /*
3118 * Given a pool name and a dataset object number in that pool,
3119 * return the name of that dataset.
3120 */
3121 int
dsl_dsobj_to_dsname(char * pname,uint64_t obj,char * buf)3122 dsl_dsobj_to_dsname(char *pname, uint64_t obj, char *buf)
3123 {
3124 dsl_pool_t *dp;
3125 dsl_dataset_t *ds;
3126 int error;
3127
3128 error = dsl_pool_hold(pname, FTAG, &dp);
3129 if (error != 0)
3130 return (error);
3131
3132 error = dsl_dataset_hold_obj(dp, obj, FTAG, &ds);
3133 if (error == 0) {
3134 dsl_dataset_name(ds, buf);
3135 dsl_dataset_rele(ds, FTAG);
3136 }
3137 dsl_pool_rele(dp, FTAG);
3138
3139 return (error);
3140 }
3141
3142 int
dsl_dataset_check_quota(dsl_dataset_t * ds,boolean_t check_quota,uint64_t asize,uint64_t inflight,uint64_t * used,uint64_t * ref_rsrv)3143 dsl_dataset_check_quota(dsl_dataset_t *ds, boolean_t check_quota,
3144 uint64_t asize, uint64_t inflight, uint64_t *used, uint64_t *ref_rsrv)
3145 {
3146 int error = 0;
3147
3148 ASSERT3S(asize, >, 0);
3149
3150 /*
3151 * *ref_rsrv is the portion of asize that will come from any
3152 * unconsumed refreservation space.
3153 */
3154 *ref_rsrv = 0;
3155
3156 mutex_enter(&ds->ds_lock);
3157 /*
3158 * Make a space adjustment for reserved bytes.
3159 */
3160 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes) {
3161 ASSERT3U(*used, >=,
3162 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes);
3163 *used -=
3164 (ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes);
3165 *ref_rsrv =
3166 asize - MIN(asize, parent_delta(ds, asize + inflight));
3167 }
3168
3169 if (!check_quota || ds->ds_quota == 0) {
3170 mutex_exit(&ds->ds_lock);
3171 return (0);
3172 }
3173 /*
3174 * If they are requesting more space, and our current estimate
3175 * is over quota, they get to try again unless the actual
3176 * on-disk is over quota and there are no pending changes (which
3177 * may free up space for us).
3178 */
3179 if (dsl_dataset_phys(ds)->ds_referenced_bytes + inflight >=
3180 ds->ds_quota) {
3181 if (inflight > 0 ||
3182 dsl_dataset_phys(ds)->ds_referenced_bytes < ds->ds_quota)
3183 error = SET_ERROR(ERESTART);
3184 else
3185 error = SET_ERROR(EDQUOT);
3186 }
3187 mutex_exit(&ds->ds_lock);
3188
3189 return (error);
3190 }
3191
3192 typedef struct dsl_dataset_set_qr_arg {
3193 const char *ddsqra_name;
3194 zprop_source_t ddsqra_source;
3195 uint64_t ddsqra_value;
3196 } dsl_dataset_set_qr_arg_t;
3197
3198
3199 /* ARGSUSED */
3200 static int
dsl_dataset_set_refquota_check(void * arg,dmu_tx_t * tx)3201 dsl_dataset_set_refquota_check(void *arg, dmu_tx_t *tx)
3202 {
3203 dsl_dataset_set_qr_arg_t *ddsqra = arg;
3204 dsl_pool_t *dp = dmu_tx_pool(tx);
3205 dsl_dataset_t *ds;
3206 int error;
3207 uint64_t newval;
3208
3209 if (spa_version(dp->dp_spa) < SPA_VERSION_REFQUOTA)
3210 return (SET_ERROR(ENOTSUP));
3211
3212 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds);
3213 if (error != 0)
3214 return (error);
3215
3216 if (ds->ds_is_snapshot) {
3217 dsl_dataset_rele(ds, FTAG);
3218 return (SET_ERROR(EINVAL));
3219 }
3220
3221 error = dsl_prop_predict(ds->ds_dir,
3222 zfs_prop_to_name(ZFS_PROP_REFQUOTA),
3223 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval);
3224 if (error != 0) {
3225 dsl_dataset_rele(ds, FTAG);
3226 return (error);
3227 }
3228
3229 if (newval == 0) {
3230 dsl_dataset_rele(ds, FTAG);
3231 return (0);
3232 }
3233
3234 if (newval < dsl_dataset_phys(ds)->ds_referenced_bytes ||
3235 newval < ds->ds_reserved) {
3236 dsl_dataset_rele(ds, FTAG);
3237 return (SET_ERROR(ENOSPC));
3238 }
3239
3240 dsl_dataset_rele(ds, FTAG);
3241 return (0);
3242 }
3243
3244 static void
dsl_dataset_set_refquota_sync(void * arg,dmu_tx_t * tx)3245 dsl_dataset_set_refquota_sync(void *arg, dmu_tx_t *tx)
3246 {
3247 dsl_dataset_set_qr_arg_t *ddsqra = arg;
3248 dsl_pool_t *dp = dmu_tx_pool(tx);
3249 dsl_dataset_t *ds;
3250 uint64_t newval;
3251
3252 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds));
3253
3254 dsl_prop_set_sync_impl(ds,
3255 zfs_prop_to_name(ZFS_PROP_REFQUOTA),
3256 ddsqra->ddsqra_source, sizeof (ddsqra->ddsqra_value), 1,
3257 &ddsqra->ddsqra_value, tx);
3258
3259 VERIFY0(dsl_prop_get_int_ds(ds,
3260 zfs_prop_to_name(ZFS_PROP_REFQUOTA), &newval));
3261
3262 if (ds->ds_quota != newval) {
3263 dmu_buf_will_dirty(ds->ds_dbuf, tx);
3264 ds->ds_quota = newval;
3265 }
3266 dsl_dataset_rele(ds, FTAG);
3267 }
3268
3269 int
dsl_dataset_set_refquota(const char * dsname,zprop_source_t source,uint64_t refquota)3270 dsl_dataset_set_refquota(const char *dsname, zprop_source_t source,
3271 uint64_t refquota)
3272 {
3273 dsl_dataset_set_qr_arg_t ddsqra;
3274
3275 ddsqra.ddsqra_name = dsname;
3276 ddsqra.ddsqra_source = source;
3277 ddsqra.ddsqra_value = refquota;
3278
3279 return (dsl_sync_task(dsname, dsl_dataset_set_refquota_check,
3280 dsl_dataset_set_refquota_sync, &ddsqra, 0, ZFS_SPACE_CHECK_NONE));
3281 }
3282
3283 static int
dsl_dataset_set_refreservation_check(void * arg,dmu_tx_t * tx)3284 dsl_dataset_set_refreservation_check(void *arg, dmu_tx_t *tx)
3285 {
3286 dsl_dataset_set_qr_arg_t *ddsqra = arg;
3287 dsl_pool_t *dp = dmu_tx_pool(tx);
3288 dsl_dataset_t *ds;
3289 int error;
3290 uint64_t newval, unique;
3291
3292 if (spa_version(dp->dp_spa) < SPA_VERSION_REFRESERVATION)
3293 return (SET_ERROR(ENOTSUP));
3294
3295 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds);
3296 if (error != 0)
3297 return (error);
3298
3299 if (ds->ds_is_snapshot) {
3300 dsl_dataset_rele(ds, FTAG);
3301 return (SET_ERROR(EINVAL));
3302 }
3303
3304 error = dsl_prop_predict(ds->ds_dir,
3305 zfs_prop_to_name(ZFS_PROP_REFRESERVATION),
3306 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval);
3307 if (error != 0) {
3308 dsl_dataset_rele(ds, FTAG);
3309 return (error);
3310 }
3311
3312 /*
3313 * If we are doing the preliminary check in open context, the
3314 * space estimates may be inaccurate.
3315 */
3316 if (!dmu_tx_is_syncing(tx)) {
3317 dsl_dataset_rele(ds, FTAG);
3318 return (0);
3319 }
3320
3321 mutex_enter(&ds->ds_lock);
3322 if (!DS_UNIQUE_IS_ACCURATE(ds))
3323 dsl_dataset_recalc_head_uniq(ds);
3324 unique = dsl_dataset_phys(ds)->ds_unique_bytes;
3325 mutex_exit(&ds->ds_lock);
3326
3327 if (MAX(unique, newval) > MAX(unique, ds->ds_reserved)) {
3328 uint64_t delta = MAX(unique, newval) -
3329 MAX(unique, ds->ds_reserved);
3330
3331 if (delta >
3332 dsl_dir_space_available(ds->ds_dir, NULL, 0, B_TRUE) ||
3333 (ds->ds_quota > 0 && newval > ds->ds_quota)) {
3334 dsl_dataset_rele(ds, FTAG);
3335 return (SET_ERROR(ENOSPC));
3336 }
3337 }
3338
3339 dsl_dataset_rele(ds, FTAG);
3340 return (0);
3341 }
3342
3343 void
dsl_dataset_set_refreservation_sync_impl(dsl_dataset_t * ds,zprop_source_t source,uint64_t value,dmu_tx_t * tx)3344 dsl_dataset_set_refreservation_sync_impl(dsl_dataset_t *ds,
3345 zprop_source_t source, uint64_t value, dmu_tx_t *tx)
3346 {
3347 uint64_t newval;
3348 uint64_t unique;
3349 int64_t delta;
3350
3351 dsl_prop_set_sync_impl(ds, zfs_prop_to_name(ZFS_PROP_REFRESERVATION),
3352 source, sizeof (value), 1, &value, tx);
3353
3354 VERIFY0(dsl_prop_get_int_ds(ds,
3355 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), &newval));
3356
3357 dmu_buf_will_dirty(ds->ds_dbuf, tx);
3358 mutex_enter(&ds->ds_dir->dd_lock);
3359 mutex_enter(&ds->ds_lock);
3360 ASSERT(DS_UNIQUE_IS_ACCURATE(ds));
3361 unique = dsl_dataset_phys(ds)->ds_unique_bytes;
3362 delta = MAX(0, (int64_t)(newval - unique)) -
3363 MAX(0, (int64_t)(ds->ds_reserved - unique));
3364 ds->ds_reserved = newval;
3365 mutex_exit(&ds->ds_lock);
3366
3367 dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV, delta, 0, 0, tx);
3368 mutex_exit(&ds->ds_dir->dd_lock);
3369 }
3370
3371 static void
dsl_dataset_set_refreservation_sync(void * arg,dmu_tx_t * tx)3372 dsl_dataset_set_refreservation_sync(void *arg, dmu_tx_t *tx)
3373 {
3374 dsl_dataset_set_qr_arg_t *ddsqra = arg;
3375 dsl_pool_t *dp = dmu_tx_pool(tx);
3376 dsl_dataset_t *ds;
3377
3378 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds));
3379 dsl_dataset_set_refreservation_sync_impl(ds,
3380 ddsqra->ddsqra_source, ddsqra->ddsqra_value, tx);
3381 dsl_dataset_rele(ds, FTAG);
3382 }
3383
3384 int
dsl_dataset_set_refreservation(const char * dsname,zprop_source_t source,uint64_t refreservation)3385 dsl_dataset_set_refreservation(const char *dsname, zprop_source_t source,
3386 uint64_t refreservation)
3387 {
3388 dsl_dataset_set_qr_arg_t ddsqra;
3389
3390 ddsqra.ddsqra_name = dsname;
3391 ddsqra.ddsqra_source = source;
3392 ddsqra.ddsqra_value = refreservation;
3393
3394 return (dsl_sync_task(dsname, dsl_dataset_set_refreservation_check,
3395 dsl_dataset_set_refreservation_sync, &ddsqra,
3396 0, ZFS_SPACE_CHECK_NONE));
3397 }
3398
3399 /*
3400 * Return (in *usedp) the amount of space written in new that is not
3401 * present in oldsnap. New may be a snapshot or the head. Old must be
3402 * a snapshot before new, in new's filesystem (or its origin). If not then
3403 * fail and return EINVAL.
3404 *
3405 * The written space is calculated by considering two components: First, we
3406 * ignore any freed space, and calculate the written as new's used space
3407 * minus old's used space. Next, we add in the amount of space that was freed
3408 * between the two snapshots, thus reducing new's used space relative to old's.
3409 * Specifically, this is the space that was born before old->ds_creation_txg,
3410 * and freed before new (ie. on new's deadlist or a previous deadlist).
3411 *
3412 * space freed [---------------------]
3413 * snapshots ---O-------O--------O-------O------
3414 * oldsnap new
3415 */
3416 int
dsl_dataset_space_written(dsl_dataset_t * oldsnap,dsl_dataset_t * new,uint64_t * usedp,uint64_t * compp,uint64_t * uncompp)3417 dsl_dataset_space_written(dsl_dataset_t *oldsnap, dsl_dataset_t *new,
3418 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp)
3419 {
3420 int err = 0;
3421 uint64_t snapobj;
3422 dsl_pool_t *dp = new->ds_dir->dd_pool;
3423
3424 ASSERT(dsl_pool_config_held(dp));
3425
3426 *usedp = 0;
3427 *usedp += dsl_dataset_phys(new)->ds_referenced_bytes;
3428 *usedp -= dsl_dataset_phys(oldsnap)->ds_referenced_bytes;
3429
3430 *compp = 0;
3431 *compp += dsl_dataset_phys(new)->ds_compressed_bytes;
3432 *compp -= dsl_dataset_phys(oldsnap)->ds_compressed_bytes;
3433
3434 *uncompp = 0;
3435 *uncompp += dsl_dataset_phys(new)->ds_uncompressed_bytes;
3436 *uncompp -= dsl_dataset_phys(oldsnap)->ds_uncompressed_bytes;
3437
3438 snapobj = new->ds_object;
3439 while (snapobj != oldsnap->ds_object) {
3440 dsl_dataset_t *snap;
3441 uint64_t used, comp, uncomp;
3442
3443 if (snapobj == new->ds_object) {
3444 snap = new;
3445 } else {
3446 err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &snap);
3447 if (err != 0)
3448 break;
3449 }
3450
3451 if (dsl_dataset_phys(snap)->ds_prev_snap_txg ==
3452 dsl_dataset_phys(oldsnap)->ds_creation_txg) {
3453 /*
3454 * The blocks in the deadlist can not be born after
3455 * ds_prev_snap_txg, so get the whole deadlist space,
3456 * which is more efficient (especially for old-format
3457 * deadlists). Unfortunately the deadlist code
3458 * doesn't have enough information to make this
3459 * optimization itself.
3460 */
3461 dsl_deadlist_space(&snap->ds_deadlist,
3462 &used, &comp, &uncomp);
3463 } else {
3464 dsl_deadlist_space_range(&snap->ds_deadlist,
3465 0, dsl_dataset_phys(oldsnap)->ds_creation_txg,
3466 &used, &comp, &uncomp);
3467 }
3468 *usedp += used;
3469 *compp += comp;
3470 *uncompp += uncomp;
3471
3472 /*
3473 * If we get to the beginning of the chain of snapshots
3474 * (ds_prev_snap_obj == 0) before oldsnap, then oldsnap
3475 * was not a snapshot of/before new.
3476 */
3477 snapobj = dsl_dataset_phys(snap)->ds_prev_snap_obj;
3478 if (snap != new)
3479 dsl_dataset_rele(snap, FTAG);
3480 if (snapobj == 0) {
3481 err = SET_ERROR(EINVAL);
3482 break;
3483 }
3484
3485 }
3486 return (err);
3487 }
3488
3489 /*
3490 * Return (in *usedp) the amount of space that will be reclaimed if firstsnap,
3491 * lastsnap, and all snapshots in between are deleted.
3492 *
3493 * blocks that would be freed [---------------------------]
3494 * snapshots ---O-------O--------O-------O--------O
3495 * firstsnap lastsnap
3496 *
3497 * This is the set of blocks that were born after the snap before firstsnap,
3498 * (birth > firstsnap->prev_snap_txg) and died before the snap after the
3499 * last snap (ie, is on lastsnap->ds_next->ds_deadlist or an earlier deadlist).
3500 * We calculate this by iterating over the relevant deadlists (from the snap
3501 * after lastsnap, backward to the snap after firstsnap), summing up the
3502 * space on the deadlist that was born after the snap before firstsnap.
3503 */
3504 int
dsl_dataset_space_wouldfree(dsl_dataset_t * firstsnap,dsl_dataset_t * lastsnap,uint64_t * usedp,uint64_t * compp,uint64_t * uncompp)3505 dsl_dataset_space_wouldfree(dsl_dataset_t *firstsnap,
3506 dsl_dataset_t *lastsnap,
3507 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp)
3508 {
3509 int err = 0;
3510 uint64_t snapobj;
3511 dsl_pool_t *dp = firstsnap->ds_dir->dd_pool;
3512
3513 ASSERT(firstsnap->ds_is_snapshot);
3514 ASSERT(lastsnap->ds_is_snapshot);
3515
3516 /*
3517 * Check that the snapshots are in the same dsl_dir, and firstsnap
3518 * is before lastsnap.
3519 */
3520 if (firstsnap->ds_dir != lastsnap->ds_dir ||
3521 dsl_dataset_phys(firstsnap)->ds_creation_txg >
3522 dsl_dataset_phys(lastsnap)->ds_creation_txg)
3523 return (SET_ERROR(EINVAL));
3524
3525 *usedp = *compp = *uncompp = 0;
3526
3527 snapobj = dsl_dataset_phys(lastsnap)->ds_next_snap_obj;
3528 while (snapobj != firstsnap->ds_object) {
3529 dsl_dataset_t *ds;
3530 uint64_t used, comp, uncomp;
3531
3532 err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &ds);
3533 if (err != 0)
3534 break;
3535
3536 dsl_deadlist_space_range(&ds->ds_deadlist,
3537 dsl_dataset_phys(firstsnap)->ds_prev_snap_txg, UINT64_MAX,
3538 &used, &comp, &uncomp);
3539 *usedp += used;
3540 *compp += comp;
3541 *uncompp += uncomp;
3542
3543 snapobj = dsl_dataset_phys(ds)->ds_prev_snap_obj;
3544 ASSERT3U(snapobj, !=, 0);
3545 dsl_dataset_rele(ds, FTAG);
3546 }
3547 return (err);
3548 }
3549
3550 /*
3551 * Return TRUE if 'earlier' is an earlier snapshot in 'later's timeline.
3552 * For example, they could both be snapshots of the same filesystem, and
3553 * 'earlier' is before 'later'. Or 'earlier' could be the origin of
3554 * 'later's filesystem. Or 'earlier' could be an older snapshot in the origin's
3555 * filesystem. Or 'earlier' could be the origin's origin.
3556 *
3557 * If non-zero, earlier_txg is used instead of earlier's ds_creation_txg.
3558 */
3559 boolean_t
dsl_dataset_is_before(dsl_dataset_t * later,dsl_dataset_t * earlier,uint64_t earlier_txg)3560 dsl_dataset_is_before(dsl_dataset_t *later, dsl_dataset_t *earlier,
3561 uint64_t earlier_txg)
3562 {
3563 dsl_pool_t *dp = later->ds_dir->dd_pool;
3564 int error;
3565 boolean_t ret;
3566
3567 ASSERT(dsl_pool_config_held(dp));
3568 ASSERT(earlier->ds_is_snapshot || earlier_txg != 0);
3569
3570 if (earlier_txg == 0)
3571 earlier_txg = dsl_dataset_phys(earlier)->ds_creation_txg;
3572
3573 if (later->ds_is_snapshot &&
3574 earlier_txg >= dsl_dataset_phys(later)->ds_creation_txg)
3575 return (B_FALSE);
3576
3577 if (later->ds_dir == earlier->ds_dir)
3578 return (B_TRUE);
3579 if (!dsl_dir_is_clone(later->ds_dir))
3580 return (B_FALSE);
3581
3582 if (dsl_dir_phys(later->ds_dir)->dd_origin_obj == earlier->ds_object)
3583 return (B_TRUE);
3584 dsl_dataset_t *origin;
3585 error = dsl_dataset_hold_obj(dp,
3586 dsl_dir_phys(later->ds_dir)->dd_origin_obj, FTAG, &origin);
3587 if (error != 0)
3588 return (B_FALSE);
3589 ret = dsl_dataset_is_before(origin, earlier, earlier_txg);
3590 dsl_dataset_rele(origin, FTAG);
3591 return (ret);
3592 }
3593
3594 void
dsl_dataset_zapify(dsl_dataset_t * ds,dmu_tx_t * tx)3595 dsl_dataset_zapify(dsl_dataset_t *ds, dmu_tx_t *tx)
3596 {
3597 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
3598 dmu_object_zapify(mos, ds->ds_object, DMU_OT_DSL_DATASET, tx);
3599 }
3600
3601 boolean_t
dsl_dataset_is_zapified(dsl_dataset_t * ds)3602 dsl_dataset_is_zapified(dsl_dataset_t *ds)
3603 {
3604 dmu_object_info_t doi;
3605
3606 dmu_object_info_from_db(ds->ds_dbuf, &doi);
3607 return (doi.doi_type == DMU_OTN_ZAP_METADATA);
3608 }
3609
3610 boolean_t
dsl_dataset_has_resume_receive_state(dsl_dataset_t * ds)3611 dsl_dataset_has_resume_receive_state(dsl_dataset_t *ds)
3612 {
3613 return (dsl_dataset_is_zapified(ds) &&
3614 zap_contains(ds->ds_dir->dd_pool->dp_meta_objset,
3615 ds->ds_object, DS_FIELD_RESUME_TOGUID) == 0);
3616 }
3617