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 https://opensource.org/licenses/CDDL-1.0. 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 /* 23 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 24 * Copyright (c) 2011, 2020 by Delphix. All rights reserved. 25 * Copyright (c) 2014, Joyent, Inc. All rights reserved. 26 * Copyright (c) 2014 RackTop Systems. 27 * Copyright (c) 2014 Spectra Logic Corporation, All rights reserved. 28 * Copyright (c) 2016 Actifio, Inc. All rights reserved. 29 * Copyright 2016, OmniTI Computer Consulting, Inc. All rights reserved. 30 * Copyright 2017 Nexenta Systems, Inc. 31 * Copyright (c) 2019, Klara Inc. 32 * Copyright (c) 2019, Allan Jude 33 * Copyright (c) 2020 The FreeBSD Foundation [1] 34 * 35 * [1] Portions of this software were developed by Allan Jude 36 * under sponsorship from the FreeBSD Foundation. 37 */ 38 39 #include <sys/dmu_objset.h> 40 #include <sys/dsl_dataset.h> 41 #include <sys/dsl_dir.h> 42 #include <sys/dsl_prop.h> 43 #include <sys/dsl_synctask.h> 44 #include <sys/dmu_traverse.h> 45 #include <sys/dmu_impl.h> 46 #include <sys/dmu_tx.h> 47 #include <sys/arc.h> 48 #include <sys/zio.h> 49 #include <sys/zap.h> 50 #include <sys/zfeature.h> 51 #include <sys/unique.h> 52 #include <sys/zfs_context.h> 53 #include <sys/zfs_ioctl.h> 54 #include <sys/spa.h> 55 #include <sys/spa_impl.h> 56 #include <sys/vdev.h> 57 #include <sys/zfs_znode.h> 58 #include <sys/zfs_onexit.h> 59 #include <sys/zvol.h> 60 #include <sys/dsl_scan.h> 61 #include <sys/dsl_deadlist.h> 62 #include <sys/dsl_destroy.h> 63 #include <sys/dsl_userhold.h> 64 #include <sys/dsl_bookmark.h> 65 #include <sys/policy.h> 66 #include <sys/dmu_send.h> 67 #include <sys/dmu_recv.h> 68 #include <sys/zio_compress.h> 69 #include <zfs_fletcher.h> 70 #include <sys/zio_checksum.h> 71 72 /* 73 * The SPA supports block sizes up to 16MB. However, very large blocks 74 * can have an impact on i/o latency (e.g. tying up a spinning disk for 75 * ~300ms), and also potentially on the memory allocator. Therefore, 76 * we did not allow the recordsize to be set larger than zfs_max_recordsize 77 * (former default: 1MB). Larger blocks could be created by changing this 78 * tunable, and pools with larger blocks could always be imported and used, 79 * regardless of this setting. 80 * 81 * We do, however, still limit it by default to 1M on x86_32, because Linux's 82 * 3/1 memory split doesn't leave much room for 16M chunks. 83 */ 84 #ifdef _ILP32 85 uint_t zfs_max_recordsize = 1 * 1024 * 1024; 86 #else 87 uint_t zfs_max_recordsize = 16 * 1024 * 1024; 88 #endif 89 static int zfs_allow_redacted_dataset_mount = 0; 90 91 int zfs_snapshot_history_enabled = 1; 92 93 #define SWITCH64(x, y) \ 94 { \ 95 uint64_t __tmp = (x); \ 96 (x) = (y); \ 97 (y) = __tmp; \ 98 } 99 100 #define DS_REF_MAX (1ULL << 62) 101 102 static void dsl_dataset_set_remap_deadlist_object(dsl_dataset_t *ds, 103 uint64_t obj, dmu_tx_t *tx); 104 static void dsl_dataset_unset_remap_deadlist_object(dsl_dataset_t *ds, 105 dmu_tx_t *tx); 106 107 static void unload_zfeature(dsl_dataset_t *ds, spa_feature_t f); 108 109 extern uint_t spa_asize_inflation; 110 111 static zil_header_t zero_zil; 112 113 /* 114 * Figure out how much of this delta should be propagated to the dsl_dir 115 * layer. If there's a refreservation, that space has already been 116 * partially accounted for in our ancestors. 117 */ 118 static int64_t 119 parent_delta(dsl_dataset_t *ds, int64_t delta) 120 { 121 dsl_dataset_phys_t *ds_phys; 122 uint64_t old_bytes, new_bytes; 123 124 if (ds->ds_reserved == 0) 125 return (delta); 126 127 ds_phys = dsl_dataset_phys(ds); 128 old_bytes = MAX(ds_phys->ds_unique_bytes, ds->ds_reserved); 129 new_bytes = MAX(ds_phys->ds_unique_bytes + delta, ds->ds_reserved); 130 131 ASSERT3U(ABS((int64_t)(new_bytes - old_bytes)), <=, ABS(delta)); 132 return (new_bytes - old_bytes); 133 } 134 135 void 136 dsl_dataset_block_born(dsl_dataset_t *ds, const blkptr_t *bp, dmu_tx_t *tx) 137 { 138 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 139 int used = bp_get_dsize_sync(spa, bp); 140 int compressed = BP_GET_PSIZE(bp); 141 int uncompressed = BP_GET_UCSIZE(bp); 142 int64_t delta; 143 spa_feature_t f; 144 145 dprintf_bp(bp, "ds=%p", ds); 146 147 ASSERT(dmu_tx_is_syncing(tx)); 148 /* It could have been compressed away to nothing */ 149 if (BP_IS_HOLE(bp) || BP_IS_REDACTED(bp)) 150 return; 151 ASSERT(BP_GET_TYPE(bp) != DMU_OT_NONE); 152 ASSERT(DMU_OT_IS_VALID(BP_GET_TYPE(bp))); 153 if (ds == NULL) { 154 dsl_pool_mos_diduse_space(tx->tx_pool, 155 used, compressed, uncompressed); 156 return; 157 } 158 159 ASSERT3U(bp->blk_birth, >, dsl_dataset_phys(ds)->ds_prev_snap_txg); 160 dmu_buf_will_dirty(ds->ds_dbuf, tx); 161 mutex_enter(&ds->ds_lock); 162 delta = parent_delta(ds, used); 163 dsl_dataset_phys(ds)->ds_referenced_bytes += used; 164 dsl_dataset_phys(ds)->ds_compressed_bytes += compressed; 165 dsl_dataset_phys(ds)->ds_uncompressed_bytes += uncompressed; 166 dsl_dataset_phys(ds)->ds_unique_bytes += used; 167 168 if (BP_GET_LSIZE(bp) > SPA_OLD_MAXBLOCKSIZE) { 169 ds->ds_feature_activation[SPA_FEATURE_LARGE_BLOCKS] = 170 (void *)B_TRUE; 171 } 172 173 174 f = zio_checksum_to_feature(BP_GET_CHECKSUM(bp)); 175 if (f != SPA_FEATURE_NONE) { 176 ASSERT3S(spa_feature_table[f].fi_type, ==, 177 ZFEATURE_TYPE_BOOLEAN); 178 ds->ds_feature_activation[f] = (void *)B_TRUE; 179 } 180 181 f = zio_compress_to_feature(BP_GET_COMPRESS(bp)); 182 if (f != SPA_FEATURE_NONE) { 183 ASSERT3S(spa_feature_table[f].fi_type, ==, 184 ZFEATURE_TYPE_BOOLEAN); 185 ds->ds_feature_activation[f] = (void *)B_TRUE; 186 } 187 188 /* 189 * Track block for livelist, but ignore embedded blocks because 190 * they do not need to be freed. 191 */ 192 if (dsl_deadlist_is_open(&ds->ds_dir->dd_livelist) && 193 bp->blk_birth > ds->ds_dir->dd_origin_txg && 194 !(BP_IS_EMBEDDED(bp))) { 195 ASSERT(dsl_dir_is_clone(ds->ds_dir)); 196 ASSERT(spa_feature_is_enabled(spa, 197 SPA_FEATURE_LIVELIST)); 198 bplist_append(&ds->ds_dir->dd_pending_allocs, bp); 199 } 200 201 mutex_exit(&ds->ds_lock); 202 dsl_dir_diduse_transfer_space(ds->ds_dir, delta, 203 compressed, uncompressed, used, 204 DD_USED_REFRSRV, DD_USED_HEAD, tx); 205 } 206 207 /* 208 * Called when the specified segment has been remapped, and is thus no 209 * longer referenced in the head dataset. The vdev must be indirect. 210 * 211 * If the segment is referenced by a snapshot, put it on the remap deadlist. 212 * Otherwise, add this segment to the obsolete spacemap. 213 */ 214 void 215 dsl_dataset_block_remapped(dsl_dataset_t *ds, uint64_t vdev, uint64_t offset, 216 uint64_t size, uint64_t birth, dmu_tx_t *tx) 217 { 218 spa_t *spa = ds->ds_dir->dd_pool->dp_spa; 219 220 ASSERT(dmu_tx_is_syncing(tx)); 221 ASSERT(birth <= tx->tx_txg); 222 ASSERT(!ds->ds_is_snapshot); 223 224 if (birth > dsl_dataset_phys(ds)->ds_prev_snap_txg) { 225 spa_vdev_indirect_mark_obsolete(spa, vdev, offset, size, tx); 226 } else { 227 blkptr_t fakebp; 228 dva_t *dva = &fakebp.blk_dva[0]; 229 230 ASSERT(ds != NULL); 231 232 mutex_enter(&ds->ds_remap_deadlist_lock); 233 if (!dsl_dataset_remap_deadlist_exists(ds)) { 234 dsl_dataset_create_remap_deadlist(ds, tx); 235 } 236 mutex_exit(&ds->ds_remap_deadlist_lock); 237 238 BP_ZERO(&fakebp); 239 fakebp.blk_birth = birth; 240 DVA_SET_VDEV(dva, vdev); 241 DVA_SET_OFFSET(dva, offset); 242 DVA_SET_ASIZE(dva, size); 243 dsl_deadlist_insert(&ds->ds_remap_deadlist, &fakebp, B_FALSE, 244 tx); 245 } 246 } 247 248 int 249 dsl_dataset_block_kill(dsl_dataset_t *ds, const blkptr_t *bp, dmu_tx_t *tx, 250 boolean_t async) 251 { 252 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 253 254 int used = bp_get_dsize_sync(spa, bp); 255 int compressed = BP_GET_PSIZE(bp); 256 int uncompressed = BP_GET_UCSIZE(bp); 257 258 if (BP_IS_HOLE(bp) || BP_IS_REDACTED(bp)) 259 return (0); 260 261 ASSERT(dmu_tx_is_syncing(tx)); 262 ASSERT(bp->blk_birth <= tx->tx_txg); 263 264 if (ds == NULL) { 265 dsl_free(tx->tx_pool, tx->tx_txg, bp); 266 dsl_pool_mos_diduse_space(tx->tx_pool, 267 -used, -compressed, -uncompressed); 268 return (used); 269 } 270 ASSERT3P(tx->tx_pool, ==, ds->ds_dir->dd_pool); 271 272 ASSERT(!ds->ds_is_snapshot); 273 dmu_buf_will_dirty(ds->ds_dbuf, tx); 274 275 /* 276 * Track block for livelist, but ignore embedded blocks because 277 * they do not need to be freed. 278 */ 279 if (dsl_deadlist_is_open(&ds->ds_dir->dd_livelist) && 280 bp->blk_birth > ds->ds_dir->dd_origin_txg && 281 !(BP_IS_EMBEDDED(bp))) { 282 ASSERT(dsl_dir_is_clone(ds->ds_dir)); 283 ASSERT(spa_feature_is_enabled(spa, 284 SPA_FEATURE_LIVELIST)); 285 bplist_append(&ds->ds_dir->dd_pending_frees, bp); 286 } 287 288 if (bp->blk_birth > dsl_dataset_phys(ds)->ds_prev_snap_txg) { 289 int64_t delta; 290 291 dprintf_bp(bp, "freeing ds=%llu", (u_longlong_t)ds->ds_object); 292 dsl_free(tx->tx_pool, tx->tx_txg, bp); 293 294 mutex_enter(&ds->ds_lock); 295 ASSERT(dsl_dataset_phys(ds)->ds_unique_bytes >= used || 296 !DS_UNIQUE_IS_ACCURATE(ds)); 297 delta = parent_delta(ds, -used); 298 dsl_dataset_phys(ds)->ds_unique_bytes -= used; 299 mutex_exit(&ds->ds_lock); 300 dsl_dir_diduse_transfer_space(ds->ds_dir, 301 delta, -compressed, -uncompressed, -used, 302 DD_USED_REFRSRV, DD_USED_HEAD, tx); 303 } else { 304 dprintf_bp(bp, "putting on dead list: %s", ""); 305 if (async) { 306 /* 307 * We are here as part of zio's write done callback, 308 * which means we're a zio interrupt thread. We can't 309 * call dsl_deadlist_insert() now because it may block 310 * waiting for I/O. Instead, put bp on the deferred 311 * queue and let dsl_pool_sync() finish the job. 312 */ 313 bplist_append(&ds->ds_pending_deadlist, bp); 314 } else { 315 dsl_deadlist_insert(&ds->ds_deadlist, bp, B_FALSE, tx); 316 } 317 ASSERT3U(ds->ds_prev->ds_object, ==, 318 dsl_dataset_phys(ds)->ds_prev_snap_obj); 319 ASSERT(dsl_dataset_phys(ds->ds_prev)->ds_num_children > 0); 320 /* if (bp->blk_birth > prev prev snap txg) prev unique += bs */ 321 if (dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj == 322 ds->ds_object && bp->blk_birth > 323 dsl_dataset_phys(ds->ds_prev)->ds_prev_snap_txg) { 324 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); 325 mutex_enter(&ds->ds_prev->ds_lock); 326 dsl_dataset_phys(ds->ds_prev)->ds_unique_bytes += used; 327 mutex_exit(&ds->ds_prev->ds_lock); 328 } 329 if (bp->blk_birth > ds->ds_dir->dd_origin_txg) { 330 dsl_dir_transfer_space(ds->ds_dir, used, 331 DD_USED_HEAD, DD_USED_SNAP, tx); 332 } 333 } 334 335 dsl_bookmark_block_killed(ds, bp, tx); 336 337 mutex_enter(&ds->ds_lock); 338 ASSERT3U(dsl_dataset_phys(ds)->ds_referenced_bytes, >=, used); 339 dsl_dataset_phys(ds)->ds_referenced_bytes -= used; 340 ASSERT3U(dsl_dataset_phys(ds)->ds_compressed_bytes, >=, compressed); 341 dsl_dataset_phys(ds)->ds_compressed_bytes -= compressed; 342 ASSERT3U(dsl_dataset_phys(ds)->ds_uncompressed_bytes, >=, uncompressed); 343 dsl_dataset_phys(ds)->ds_uncompressed_bytes -= uncompressed; 344 mutex_exit(&ds->ds_lock); 345 346 return (used); 347 } 348 349 struct feature_type_uint64_array_arg { 350 uint64_t length; 351 uint64_t *array; 352 }; 353 354 static void 355 unload_zfeature(dsl_dataset_t *ds, spa_feature_t f) 356 { 357 switch (spa_feature_table[f].fi_type) { 358 case ZFEATURE_TYPE_BOOLEAN: 359 break; 360 case ZFEATURE_TYPE_UINT64_ARRAY: 361 { 362 struct feature_type_uint64_array_arg *ftuaa = ds->ds_feature[f]; 363 kmem_free(ftuaa->array, ftuaa->length * sizeof (uint64_t)); 364 kmem_free(ftuaa, sizeof (*ftuaa)); 365 break; 366 } 367 default: 368 panic("Invalid zfeature type %d", spa_feature_table[f].fi_type); 369 } 370 } 371 372 static int 373 load_zfeature(objset_t *mos, dsl_dataset_t *ds, spa_feature_t f) 374 { 375 int err = 0; 376 switch (spa_feature_table[f].fi_type) { 377 case ZFEATURE_TYPE_BOOLEAN: 378 err = zap_contains(mos, ds->ds_object, 379 spa_feature_table[f].fi_guid); 380 if (err == 0) { 381 ds->ds_feature[f] = (void *)B_TRUE; 382 } else { 383 ASSERT3U(err, ==, ENOENT); 384 err = 0; 385 } 386 break; 387 case ZFEATURE_TYPE_UINT64_ARRAY: 388 { 389 uint64_t int_size, num_int; 390 uint64_t *data; 391 err = zap_length(mos, ds->ds_object, 392 spa_feature_table[f].fi_guid, &int_size, &num_int); 393 if (err != 0) { 394 ASSERT3U(err, ==, ENOENT); 395 err = 0; 396 break; 397 } 398 ASSERT3U(int_size, ==, sizeof (uint64_t)); 399 data = kmem_alloc(int_size * num_int, KM_SLEEP); 400 VERIFY0(zap_lookup(mos, ds->ds_object, 401 spa_feature_table[f].fi_guid, int_size, num_int, data)); 402 struct feature_type_uint64_array_arg *ftuaa = 403 kmem_alloc(sizeof (*ftuaa), KM_SLEEP); 404 ftuaa->length = num_int; 405 ftuaa->array = data; 406 ds->ds_feature[f] = ftuaa; 407 break; 408 } 409 default: 410 panic("Invalid zfeature type %d", spa_feature_table[f].fi_type); 411 } 412 return (err); 413 } 414 415 /* 416 * We have to release the fsid synchronously or we risk that a subsequent 417 * mount of the same dataset will fail to unique_insert the fsid. This 418 * failure would manifest itself as the fsid of this dataset changing 419 * between mounts which makes NFS clients quite unhappy. 420 */ 421 static void 422 dsl_dataset_evict_sync(void *dbu) 423 { 424 dsl_dataset_t *ds = dbu; 425 426 ASSERT(ds->ds_owner == NULL); 427 428 unique_remove(ds->ds_fsid_guid); 429 } 430 431 static void 432 dsl_dataset_evict_async(void *dbu) 433 { 434 dsl_dataset_t *ds = dbu; 435 436 ASSERT(ds->ds_owner == NULL); 437 438 ds->ds_dbuf = NULL; 439 440 if (ds->ds_objset != NULL) 441 dmu_objset_evict(ds->ds_objset); 442 443 if (ds->ds_prev) { 444 dsl_dataset_rele(ds->ds_prev, ds); 445 ds->ds_prev = NULL; 446 } 447 448 dsl_bookmark_fini_ds(ds); 449 450 bplist_destroy(&ds->ds_pending_deadlist); 451 if (dsl_deadlist_is_open(&ds->ds_deadlist)) 452 dsl_deadlist_close(&ds->ds_deadlist); 453 if (dsl_deadlist_is_open(&ds->ds_remap_deadlist)) 454 dsl_deadlist_close(&ds->ds_remap_deadlist); 455 if (ds->ds_dir) 456 dsl_dir_async_rele(ds->ds_dir, ds); 457 458 ASSERT(!list_link_active(&ds->ds_synced_link)); 459 460 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 461 if (dsl_dataset_feature_is_active(ds, f)) 462 unload_zfeature(ds, f); 463 } 464 465 list_destroy(&ds->ds_prop_cbs); 466 mutex_destroy(&ds->ds_lock); 467 mutex_destroy(&ds->ds_opening_lock); 468 mutex_destroy(&ds->ds_sendstream_lock); 469 mutex_destroy(&ds->ds_remap_deadlist_lock); 470 zfs_refcount_destroy(&ds->ds_longholds); 471 rrw_destroy(&ds->ds_bp_rwlock); 472 473 kmem_free(ds, sizeof (dsl_dataset_t)); 474 } 475 476 int 477 dsl_dataset_get_snapname(dsl_dataset_t *ds) 478 { 479 dsl_dataset_phys_t *headphys; 480 int err; 481 dmu_buf_t *headdbuf; 482 dsl_pool_t *dp = ds->ds_dir->dd_pool; 483 objset_t *mos = dp->dp_meta_objset; 484 485 if (ds->ds_snapname[0]) 486 return (0); 487 if (dsl_dataset_phys(ds)->ds_next_snap_obj == 0) 488 return (0); 489 490 err = dmu_bonus_hold(mos, dsl_dir_phys(ds->ds_dir)->dd_head_dataset_obj, 491 FTAG, &headdbuf); 492 if (err != 0) 493 return (err); 494 headphys = headdbuf->db_data; 495 err = zap_value_search(dp->dp_meta_objset, 496 headphys->ds_snapnames_zapobj, ds->ds_object, 0, ds->ds_snapname); 497 if (err != 0 && zfs_recover == B_TRUE) { 498 err = 0; 499 (void) snprintf(ds->ds_snapname, sizeof (ds->ds_snapname), 500 "SNAPOBJ=%llu-ERR=%d", 501 (unsigned long long)ds->ds_object, err); 502 } 503 dmu_buf_rele(headdbuf, FTAG); 504 return (err); 505 } 506 507 int 508 dsl_dataset_snap_lookup(dsl_dataset_t *ds, const char *name, uint64_t *value) 509 { 510 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 511 uint64_t snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj; 512 matchtype_t mt = 0; 513 int err; 514 515 if (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_CI_DATASET) 516 mt = MT_NORMALIZE; 517 518 err = zap_lookup_norm(mos, snapobj, name, 8, 1, 519 value, mt, NULL, 0, NULL); 520 if (err == ENOTSUP && (mt & MT_NORMALIZE)) 521 err = zap_lookup(mos, snapobj, name, 8, 1, value); 522 return (err); 523 } 524 525 int 526 dsl_dataset_snap_remove(dsl_dataset_t *ds, const char *name, dmu_tx_t *tx, 527 boolean_t adj_cnt) 528 { 529 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 530 uint64_t snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj; 531 matchtype_t mt = 0; 532 int err; 533 534 dsl_dir_snap_cmtime_update(ds->ds_dir, tx); 535 536 if (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_CI_DATASET) 537 mt = MT_NORMALIZE; 538 539 err = zap_remove_norm(mos, snapobj, name, mt, tx); 540 if (err == ENOTSUP && (mt & MT_NORMALIZE)) 541 err = zap_remove(mos, snapobj, name, tx); 542 543 if (err == 0 && adj_cnt) 544 dsl_fs_ss_count_adjust(ds->ds_dir, -1, 545 DD_FIELD_SNAPSHOT_COUNT, tx); 546 547 return (err); 548 } 549 550 boolean_t 551 dsl_dataset_try_add_ref(dsl_pool_t *dp, dsl_dataset_t *ds, const void *tag) 552 { 553 dmu_buf_t *dbuf = ds->ds_dbuf; 554 boolean_t result = B_FALSE; 555 556 if (dbuf != NULL && dmu_buf_try_add_ref(dbuf, dp->dp_meta_objset, 557 ds->ds_object, DMU_BONUS_BLKID, tag)) { 558 559 if (ds == dmu_buf_get_user(dbuf)) 560 result = B_TRUE; 561 else 562 dmu_buf_rele(dbuf, tag); 563 } 564 565 return (result); 566 } 567 568 int 569 dsl_dataset_hold_obj(dsl_pool_t *dp, uint64_t dsobj, const void *tag, 570 dsl_dataset_t **dsp) 571 { 572 objset_t *mos = dp->dp_meta_objset; 573 dmu_buf_t *dbuf; 574 dsl_dataset_t *ds; 575 int err; 576 dmu_object_info_t doi; 577 578 ASSERT(dsl_pool_config_held(dp)); 579 580 err = dmu_bonus_hold(mos, dsobj, tag, &dbuf); 581 if (err != 0) 582 return (err); 583 584 /* Make sure dsobj has the correct object type. */ 585 dmu_object_info_from_db(dbuf, &doi); 586 if (doi.doi_bonus_type != DMU_OT_DSL_DATASET) { 587 dmu_buf_rele(dbuf, tag); 588 return (SET_ERROR(EINVAL)); 589 } 590 591 ds = dmu_buf_get_user(dbuf); 592 if (ds == NULL) { 593 dsl_dataset_t *winner = NULL; 594 595 ds = kmem_zalloc(sizeof (dsl_dataset_t), KM_SLEEP); 596 ds->ds_dbuf = dbuf; 597 ds->ds_object = dsobj; 598 ds->ds_is_snapshot = dsl_dataset_phys(ds)->ds_num_children != 0; 599 list_link_init(&ds->ds_synced_link); 600 601 err = dsl_dir_hold_obj(dp, dsl_dataset_phys(ds)->ds_dir_obj, 602 NULL, ds, &ds->ds_dir); 603 if (err != 0) { 604 kmem_free(ds, sizeof (dsl_dataset_t)); 605 dmu_buf_rele(dbuf, tag); 606 return (err); 607 } 608 609 mutex_init(&ds->ds_lock, NULL, MUTEX_DEFAULT, NULL); 610 mutex_init(&ds->ds_opening_lock, NULL, MUTEX_DEFAULT, NULL); 611 mutex_init(&ds->ds_sendstream_lock, NULL, MUTEX_DEFAULT, NULL); 612 mutex_init(&ds->ds_remap_deadlist_lock, 613 NULL, MUTEX_DEFAULT, NULL); 614 rrw_init(&ds->ds_bp_rwlock, B_FALSE); 615 zfs_refcount_create(&ds->ds_longholds); 616 617 bplist_create(&ds->ds_pending_deadlist); 618 619 list_create(&ds->ds_sendstreams, sizeof (dmu_sendstatus_t), 620 offsetof(dmu_sendstatus_t, dss_link)); 621 622 list_create(&ds->ds_prop_cbs, sizeof (dsl_prop_cb_record_t), 623 offsetof(dsl_prop_cb_record_t, cbr_ds_node)); 624 625 if (doi.doi_type == DMU_OTN_ZAP_METADATA) { 626 spa_feature_t f; 627 628 for (f = 0; f < SPA_FEATURES; f++) { 629 if (!(spa_feature_table[f].fi_flags & 630 ZFEATURE_FLAG_PER_DATASET)) 631 continue; 632 err = load_zfeature(mos, ds, f); 633 } 634 } 635 636 if (!ds->ds_is_snapshot) { 637 ds->ds_snapname[0] = '\0'; 638 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) { 639 err = dsl_dataset_hold_obj(dp, 640 dsl_dataset_phys(ds)->ds_prev_snap_obj, 641 ds, &ds->ds_prev); 642 } 643 if (err != 0) 644 goto after_dsl_bookmark_fini; 645 err = dsl_bookmark_init_ds(ds); 646 } else { 647 if (zfs_flags & ZFS_DEBUG_SNAPNAMES) 648 err = dsl_dataset_get_snapname(ds); 649 if (err == 0 && 650 dsl_dataset_phys(ds)->ds_userrefs_obj != 0) { 651 err = zap_count( 652 ds->ds_dir->dd_pool->dp_meta_objset, 653 dsl_dataset_phys(ds)->ds_userrefs_obj, 654 &ds->ds_userrefs); 655 } 656 } 657 658 if (err == 0 && !ds->ds_is_snapshot) { 659 err = dsl_prop_get_int_ds(ds, 660 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 661 &ds->ds_reserved); 662 if (err == 0) { 663 err = dsl_prop_get_int_ds(ds, 664 zfs_prop_to_name(ZFS_PROP_REFQUOTA), 665 &ds->ds_quota); 666 } 667 } else { 668 ds->ds_reserved = ds->ds_quota = 0; 669 } 670 671 if (err == 0 && ds->ds_dir->dd_crypto_obj != 0 && 672 ds->ds_is_snapshot && 673 zap_contains(mos, dsobj, DS_FIELD_IVSET_GUID) != 0) { 674 dp->dp_spa->spa_errata = 675 ZPOOL_ERRATA_ZOL_8308_ENCRYPTION; 676 } 677 678 dsl_deadlist_open(&ds->ds_deadlist, 679 mos, dsl_dataset_phys(ds)->ds_deadlist_obj); 680 uint64_t remap_deadlist_obj = 681 dsl_dataset_get_remap_deadlist_object(ds); 682 if (remap_deadlist_obj != 0) { 683 dsl_deadlist_open(&ds->ds_remap_deadlist, mos, 684 remap_deadlist_obj); 685 } 686 687 dmu_buf_init_user(&ds->ds_dbu, dsl_dataset_evict_sync, 688 dsl_dataset_evict_async, &ds->ds_dbuf); 689 if (err == 0) 690 winner = dmu_buf_set_user_ie(dbuf, &ds->ds_dbu); 691 692 if (err != 0 || winner != NULL) { 693 dsl_deadlist_close(&ds->ds_deadlist); 694 if (dsl_deadlist_is_open(&ds->ds_remap_deadlist)) 695 dsl_deadlist_close(&ds->ds_remap_deadlist); 696 dsl_bookmark_fini_ds(ds); 697 after_dsl_bookmark_fini: 698 if (ds->ds_prev) 699 dsl_dataset_rele(ds->ds_prev, ds); 700 dsl_dir_rele(ds->ds_dir, ds); 701 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 702 if (dsl_dataset_feature_is_active(ds, f)) 703 unload_zfeature(ds, f); 704 } 705 706 list_destroy(&ds->ds_prop_cbs); 707 list_destroy(&ds->ds_sendstreams); 708 bplist_destroy(&ds->ds_pending_deadlist); 709 mutex_destroy(&ds->ds_lock); 710 mutex_destroy(&ds->ds_opening_lock); 711 mutex_destroy(&ds->ds_sendstream_lock); 712 mutex_destroy(&ds->ds_remap_deadlist_lock); 713 zfs_refcount_destroy(&ds->ds_longholds); 714 rrw_destroy(&ds->ds_bp_rwlock); 715 kmem_free(ds, sizeof (dsl_dataset_t)); 716 if (err != 0) { 717 dmu_buf_rele(dbuf, tag); 718 return (err); 719 } 720 ds = winner; 721 } else { 722 ds->ds_fsid_guid = 723 unique_insert(dsl_dataset_phys(ds)->ds_fsid_guid); 724 if (ds->ds_fsid_guid != 725 dsl_dataset_phys(ds)->ds_fsid_guid) { 726 zfs_dbgmsg("ds_fsid_guid changed from " 727 "%llx to %llx for pool %s dataset id %llu", 728 (long long) 729 dsl_dataset_phys(ds)->ds_fsid_guid, 730 (long long)ds->ds_fsid_guid, 731 spa_name(dp->dp_spa), 732 (u_longlong_t)dsobj); 733 } 734 } 735 } 736 737 ASSERT3P(ds->ds_dbuf, ==, dbuf); 738 ASSERT3P(dsl_dataset_phys(ds), ==, dbuf->db_data); 739 ASSERT(dsl_dataset_phys(ds)->ds_prev_snap_obj != 0 || 740 spa_version(dp->dp_spa) < SPA_VERSION_ORIGIN || 741 dp->dp_origin_snap == NULL || ds == dp->dp_origin_snap); 742 *dsp = ds; 743 744 return (0); 745 } 746 747 int 748 dsl_dataset_create_key_mapping(dsl_dataset_t *ds) 749 { 750 dsl_dir_t *dd = ds->ds_dir; 751 752 if (dd->dd_crypto_obj == 0) 753 return (0); 754 755 return (spa_keystore_create_mapping(dd->dd_pool->dp_spa, 756 ds, ds, &ds->ds_key_mapping)); 757 } 758 759 int 760 dsl_dataset_hold_obj_flags(dsl_pool_t *dp, uint64_t dsobj, 761 ds_hold_flags_t flags, const void *tag, dsl_dataset_t **dsp) 762 { 763 int err; 764 765 err = dsl_dataset_hold_obj(dp, dsobj, tag, dsp); 766 if (err != 0) 767 return (err); 768 769 ASSERT3P(*dsp, !=, NULL); 770 771 if (flags & DS_HOLD_FLAG_DECRYPT) { 772 err = dsl_dataset_create_key_mapping(*dsp); 773 if (err != 0) 774 dsl_dataset_rele(*dsp, tag); 775 } 776 777 return (err); 778 } 779 780 int 781 dsl_dataset_hold_flags(dsl_pool_t *dp, const char *name, ds_hold_flags_t flags, 782 const void *tag, dsl_dataset_t **dsp) 783 { 784 dsl_dir_t *dd; 785 const char *snapname; 786 uint64_t obj; 787 int err = 0; 788 dsl_dataset_t *ds; 789 790 err = dsl_dir_hold(dp, name, FTAG, &dd, &snapname); 791 if (err != 0) 792 return (err); 793 794 ASSERT(dsl_pool_config_held(dp)); 795 obj = dsl_dir_phys(dd)->dd_head_dataset_obj; 796 if (obj != 0) 797 err = dsl_dataset_hold_obj_flags(dp, obj, flags, tag, &ds); 798 else 799 err = SET_ERROR(ENOENT); 800 801 /* we may be looking for a snapshot */ 802 if (err == 0 && snapname != NULL) { 803 dsl_dataset_t *snap_ds; 804 805 if (*snapname++ != '@') { 806 dsl_dataset_rele_flags(ds, flags, tag); 807 dsl_dir_rele(dd, FTAG); 808 return (SET_ERROR(ENOENT)); 809 } 810 811 dprintf("looking for snapshot '%s'\n", snapname); 812 err = dsl_dataset_snap_lookup(ds, snapname, &obj); 813 if (err == 0) { 814 err = dsl_dataset_hold_obj_flags(dp, obj, flags, tag, 815 &snap_ds); 816 } 817 dsl_dataset_rele_flags(ds, flags, tag); 818 819 if (err == 0) { 820 mutex_enter(&snap_ds->ds_lock); 821 if (snap_ds->ds_snapname[0] == 0) 822 (void) strlcpy(snap_ds->ds_snapname, snapname, 823 sizeof (snap_ds->ds_snapname)); 824 mutex_exit(&snap_ds->ds_lock); 825 ds = snap_ds; 826 } 827 } 828 if (err == 0) 829 *dsp = ds; 830 dsl_dir_rele(dd, FTAG); 831 return (err); 832 } 833 834 int 835 dsl_dataset_hold(dsl_pool_t *dp, const char *name, const void *tag, 836 dsl_dataset_t **dsp) 837 { 838 return (dsl_dataset_hold_flags(dp, name, 0, tag, dsp)); 839 } 840 841 static int 842 dsl_dataset_own_obj_impl(dsl_pool_t *dp, uint64_t dsobj, ds_hold_flags_t flags, 843 const void *tag, boolean_t override, dsl_dataset_t **dsp) 844 { 845 int err = dsl_dataset_hold_obj_flags(dp, dsobj, flags, tag, dsp); 846 if (err != 0) 847 return (err); 848 if (!dsl_dataset_tryown(*dsp, tag, override)) { 849 dsl_dataset_rele_flags(*dsp, flags, tag); 850 *dsp = NULL; 851 return (SET_ERROR(EBUSY)); 852 } 853 return (0); 854 } 855 856 857 int 858 dsl_dataset_own_obj(dsl_pool_t *dp, uint64_t dsobj, ds_hold_flags_t flags, 859 const void *tag, dsl_dataset_t **dsp) 860 { 861 return (dsl_dataset_own_obj_impl(dp, dsobj, flags, tag, B_FALSE, dsp)); 862 } 863 864 int 865 dsl_dataset_own_obj_force(dsl_pool_t *dp, uint64_t dsobj, 866 ds_hold_flags_t flags, const void *tag, dsl_dataset_t **dsp) 867 { 868 return (dsl_dataset_own_obj_impl(dp, dsobj, flags, tag, B_TRUE, dsp)); 869 } 870 871 static int 872 dsl_dataset_own_impl(dsl_pool_t *dp, const char *name, ds_hold_flags_t flags, 873 const void *tag, boolean_t override, dsl_dataset_t **dsp) 874 { 875 int err = dsl_dataset_hold_flags(dp, name, flags, tag, dsp); 876 if (err != 0) 877 return (err); 878 if (!dsl_dataset_tryown(*dsp, tag, override)) { 879 dsl_dataset_rele_flags(*dsp, flags, tag); 880 return (SET_ERROR(EBUSY)); 881 } 882 return (0); 883 } 884 885 int 886 dsl_dataset_own_force(dsl_pool_t *dp, const char *name, ds_hold_flags_t flags, 887 const void *tag, dsl_dataset_t **dsp) 888 { 889 return (dsl_dataset_own_impl(dp, name, flags, tag, B_TRUE, dsp)); 890 } 891 892 int 893 dsl_dataset_own(dsl_pool_t *dp, const char *name, ds_hold_flags_t flags, 894 const void *tag, dsl_dataset_t **dsp) 895 { 896 return (dsl_dataset_own_impl(dp, name, flags, tag, B_FALSE, dsp)); 897 } 898 899 /* 900 * See the comment above dsl_pool_hold() for details. In summary, a long 901 * hold is used to prevent destruction of a dataset while the pool hold 902 * is dropped, allowing other concurrent operations (e.g. spa_sync()). 903 * 904 * The dataset and pool must be held when this function is called. After it 905 * is called, the pool hold may be released while the dataset is still held 906 * and accessed. 907 */ 908 void 909 dsl_dataset_long_hold(dsl_dataset_t *ds, const void *tag) 910 { 911 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool)); 912 (void) zfs_refcount_add(&ds->ds_longholds, tag); 913 } 914 915 void 916 dsl_dataset_long_rele(dsl_dataset_t *ds, const void *tag) 917 { 918 (void) zfs_refcount_remove(&ds->ds_longholds, tag); 919 } 920 921 /* Return B_TRUE if there are any long holds on this dataset. */ 922 boolean_t 923 dsl_dataset_long_held(dsl_dataset_t *ds) 924 { 925 return (!zfs_refcount_is_zero(&ds->ds_longholds)); 926 } 927 928 void 929 dsl_dataset_name(dsl_dataset_t *ds, char *name) 930 { 931 if (ds == NULL) { 932 (void) strlcpy(name, "mos", ZFS_MAX_DATASET_NAME_LEN); 933 } else { 934 dsl_dir_name(ds->ds_dir, name); 935 VERIFY0(dsl_dataset_get_snapname(ds)); 936 if (ds->ds_snapname[0]) { 937 VERIFY3U(strlcat(name, "@", ZFS_MAX_DATASET_NAME_LEN), 938 <, ZFS_MAX_DATASET_NAME_LEN); 939 /* 940 * We use a "recursive" mutex so that we 941 * can call dprintf_ds() with ds_lock held. 942 */ 943 if (!MUTEX_HELD(&ds->ds_lock)) { 944 mutex_enter(&ds->ds_lock); 945 VERIFY3U(strlcat(name, ds->ds_snapname, 946 ZFS_MAX_DATASET_NAME_LEN), <, 947 ZFS_MAX_DATASET_NAME_LEN); 948 mutex_exit(&ds->ds_lock); 949 } else { 950 VERIFY3U(strlcat(name, ds->ds_snapname, 951 ZFS_MAX_DATASET_NAME_LEN), <, 952 ZFS_MAX_DATASET_NAME_LEN); 953 } 954 } 955 } 956 } 957 958 int 959 dsl_dataset_namelen(dsl_dataset_t *ds) 960 { 961 VERIFY0(dsl_dataset_get_snapname(ds)); 962 mutex_enter(&ds->ds_lock); 963 int len = strlen(ds->ds_snapname); 964 mutex_exit(&ds->ds_lock); 965 /* add '@' if ds is a snap */ 966 if (len > 0) 967 len++; 968 len += dsl_dir_namelen(ds->ds_dir); 969 return (len); 970 } 971 972 void 973 dsl_dataset_rele(dsl_dataset_t *ds, const void *tag) 974 { 975 dmu_buf_rele(ds->ds_dbuf, tag); 976 } 977 978 void 979 dsl_dataset_remove_key_mapping(dsl_dataset_t *ds) 980 { 981 dsl_dir_t *dd = ds->ds_dir; 982 983 if (dd == NULL || dd->dd_crypto_obj == 0) 984 return; 985 986 (void) spa_keystore_remove_mapping(dd->dd_pool->dp_spa, 987 ds->ds_object, ds); 988 } 989 990 void 991 dsl_dataset_rele_flags(dsl_dataset_t *ds, ds_hold_flags_t flags, 992 const void *tag) 993 { 994 if (flags & DS_HOLD_FLAG_DECRYPT) 995 dsl_dataset_remove_key_mapping(ds); 996 997 dsl_dataset_rele(ds, tag); 998 } 999 1000 void 1001 dsl_dataset_disown(dsl_dataset_t *ds, ds_hold_flags_t flags, const void *tag) 1002 { 1003 ASSERT3P(ds->ds_owner, ==, tag); 1004 ASSERT(ds->ds_dbuf != NULL); 1005 1006 mutex_enter(&ds->ds_lock); 1007 ds->ds_owner = NULL; 1008 mutex_exit(&ds->ds_lock); 1009 dsl_dataset_long_rele(ds, tag); 1010 dsl_dataset_rele_flags(ds, flags, tag); 1011 } 1012 1013 boolean_t 1014 dsl_dataset_tryown(dsl_dataset_t *ds, const void *tag, boolean_t override) 1015 { 1016 boolean_t gotit = FALSE; 1017 1018 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool)); 1019 mutex_enter(&ds->ds_lock); 1020 if (ds->ds_owner == NULL && (override || !(DS_IS_INCONSISTENT(ds) || 1021 (dsl_dataset_feature_is_active(ds, 1022 SPA_FEATURE_REDACTED_DATASETS) && 1023 !zfs_allow_redacted_dataset_mount)))) { 1024 ds->ds_owner = tag; 1025 dsl_dataset_long_hold(ds, tag); 1026 gotit = TRUE; 1027 } 1028 mutex_exit(&ds->ds_lock); 1029 return (gotit); 1030 } 1031 1032 boolean_t 1033 dsl_dataset_has_owner(dsl_dataset_t *ds) 1034 { 1035 boolean_t rv; 1036 mutex_enter(&ds->ds_lock); 1037 rv = (ds->ds_owner != NULL); 1038 mutex_exit(&ds->ds_lock); 1039 return (rv); 1040 } 1041 1042 static boolean_t 1043 zfeature_active(spa_feature_t f, void *arg) 1044 { 1045 switch (spa_feature_table[f].fi_type) { 1046 case ZFEATURE_TYPE_BOOLEAN: { 1047 boolean_t val = (boolean_t)(uintptr_t)arg; 1048 ASSERT(val == B_FALSE || val == B_TRUE); 1049 return (val); 1050 } 1051 case ZFEATURE_TYPE_UINT64_ARRAY: 1052 /* 1053 * In this case, arg is a uint64_t array. The feature is active 1054 * if the array is non-null. 1055 */ 1056 return (arg != NULL); 1057 default: 1058 panic("Invalid zfeature type %d", spa_feature_table[f].fi_type); 1059 return (B_FALSE); 1060 } 1061 } 1062 1063 boolean_t 1064 dsl_dataset_feature_is_active(dsl_dataset_t *ds, spa_feature_t f) 1065 { 1066 return (zfeature_active(f, ds->ds_feature[f])); 1067 } 1068 1069 /* 1070 * The buffers passed out by this function are references to internal buffers; 1071 * they should not be freed by callers of this function, and they should not be 1072 * used after the dataset has been released. 1073 */ 1074 boolean_t 1075 dsl_dataset_get_uint64_array_feature(dsl_dataset_t *ds, spa_feature_t f, 1076 uint64_t *outlength, uint64_t **outp) 1077 { 1078 VERIFY(spa_feature_table[f].fi_type & ZFEATURE_TYPE_UINT64_ARRAY); 1079 if (!dsl_dataset_feature_is_active(ds, f)) { 1080 return (B_FALSE); 1081 } 1082 struct feature_type_uint64_array_arg *ftuaa = ds->ds_feature[f]; 1083 *outp = ftuaa->array; 1084 *outlength = ftuaa->length; 1085 return (B_TRUE); 1086 } 1087 1088 void 1089 dsl_dataset_activate_feature(uint64_t dsobj, spa_feature_t f, void *arg, 1090 dmu_tx_t *tx) 1091 { 1092 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 1093 objset_t *mos = dmu_tx_pool(tx)->dp_meta_objset; 1094 uint64_t zero = 0; 1095 1096 VERIFY(spa_feature_table[f].fi_flags & ZFEATURE_FLAG_PER_DATASET); 1097 1098 spa_feature_incr(spa, f, tx); 1099 dmu_object_zapify(mos, dsobj, DMU_OT_DSL_DATASET, tx); 1100 1101 switch (spa_feature_table[f].fi_type) { 1102 case ZFEATURE_TYPE_BOOLEAN: 1103 ASSERT3S((boolean_t)(uintptr_t)arg, ==, B_TRUE); 1104 VERIFY0(zap_add(mos, dsobj, spa_feature_table[f].fi_guid, 1105 sizeof (zero), 1, &zero, tx)); 1106 break; 1107 case ZFEATURE_TYPE_UINT64_ARRAY: 1108 { 1109 struct feature_type_uint64_array_arg *ftuaa = arg; 1110 VERIFY0(zap_add(mos, dsobj, spa_feature_table[f].fi_guid, 1111 sizeof (uint64_t), ftuaa->length, ftuaa->array, tx)); 1112 break; 1113 } 1114 default: 1115 panic("Invalid zfeature type %d", spa_feature_table[f].fi_type); 1116 } 1117 } 1118 1119 static void 1120 dsl_dataset_deactivate_feature_impl(dsl_dataset_t *ds, spa_feature_t f, 1121 dmu_tx_t *tx) 1122 { 1123 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 1124 objset_t *mos = dmu_tx_pool(tx)->dp_meta_objset; 1125 uint64_t dsobj = ds->ds_object; 1126 1127 VERIFY(spa_feature_table[f].fi_flags & ZFEATURE_FLAG_PER_DATASET); 1128 1129 VERIFY0(zap_remove(mos, dsobj, spa_feature_table[f].fi_guid, tx)); 1130 spa_feature_decr(spa, f, tx); 1131 ds->ds_feature[f] = NULL; 1132 } 1133 1134 void 1135 dsl_dataset_deactivate_feature(dsl_dataset_t *ds, spa_feature_t f, dmu_tx_t *tx) 1136 { 1137 unload_zfeature(ds, f); 1138 dsl_dataset_deactivate_feature_impl(ds, f, tx); 1139 } 1140 1141 uint64_t 1142 dsl_dataset_create_sync_dd(dsl_dir_t *dd, dsl_dataset_t *origin, 1143 dsl_crypto_params_t *dcp, uint64_t flags, dmu_tx_t *tx) 1144 { 1145 dsl_pool_t *dp = dd->dd_pool; 1146 dmu_buf_t *dbuf; 1147 dsl_dataset_phys_t *dsphys; 1148 uint64_t dsobj; 1149 objset_t *mos = dp->dp_meta_objset; 1150 1151 if (origin == NULL) 1152 origin = dp->dp_origin_snap; 1153 1154 ASSERT(origin == NULL || origin->ds_dir->dd_pool == dp); 1155 ASSERT(origin == NULL || dsl_dataset_phys(origin)->ds_num_children > 0); 1156 ASSERT(dmu_tx_is_syncing(tx)); 1157 ASSERT(dsl_dir_phys(dd)->dd_head_dataset_obj == 0); 1158 1159 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, 1160 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); 1161 VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); 1162 dmu_buf_will_dirty(dbuf, tx); 1163 dsphys = dbuf->db_data; 1164 memset(dsphys, 0, sizeof (dsl_dataset_phys_t)); 1165 dsphys->ds_dir_obj = dd->dd_object; 1166 dsphys->ds_flags = flags; 1167 dsphys->ds_fsid_guid = unique_create(); 1168 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, 1169 sizeof (dsphys->ds_guid)); 1170 dsphys->ds_snapnames_zapobj = 1171 zap_create_norm(mos, U8_TEXTPREP_TOUPPER, DMU_OT_DSL_DS_SNAP_MAP, 1172 DMU_OT_NONE, 0, tx); 1173 dsphys->ds_creation_time = gethrestime_sec(); 1174 dsphys->ds_creation_txg = tx->tx_txg == TXG_INITIAL ? 1 : tx->tx_txg; 1175 1176 if (origin == NULL) { 1177 dsphys->ds_deadlist_obj = dsl_deadlist_alloc(mos, tx); 1178 } else { 1179 dsl_dataset_t *ohds; /* head of the origin snapshot */ 1180 1181 dsphys->ds_prev_snap_obj = origin->ds_object; 1182 dsphys->ds_prev_snap_txg = 1183 dsl_dataset_phys(origin)->ds_creation_txg; 1184 dsphys->ds_referenced_bytes = 1185 dsl_dataset_phys(origin)->ds_referenced_bytes; 1186 dsphys->ds_compressed_bytes = 1187 dsl_dataset_phys(origin)->ds_compressed_bytes; 1188 dsphys->ds_uncompressed_bytes = 1189 dsl_dataset_phys(origin)->ds_uncompressed_bytes; 1190 rrw_enter(&origin->ds_bp_rwlock, RW_READER, FTAG); 1191 dsphys->ds_bp = dsl_dataset_phys(origin)->ds_bp; 1192 rrw_exit(&origin->ds_bp_rwlock, FTAG); 1193 1194 /* 1195 * Inherit flags that describe the dataset's contents 1196 * (INCONSISTENT) or properties (Case Insensitive). 1197 */ 1198 dsphys->ds_flags |= dsl_dataset_phys(origin)->ds_flags & 1199 (DS_FLAG_INCONSISTENT | DS_FLAG_CI_DATASET); 1200 1201 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 1202 if (zfeature_active(f, origin->ds_feature[f])) { 1203 dsl_dataset_activate_feature(dsobj, f, 1204 origin->ds_feature[f], tx); 1205 } 1206 } 1207 1208 dmu_buf_will_dirty(origin->ds_dbuf, tx); 1209 dsl_dataset_phys(origin)->ds_num_children++; 1210 1211 VERIFY0(dsl_dataset_hold_obj(dp, 1212 dsl_dir_phys(origin->ds_dir)->dd_head_dataset_obj, 1213 FTAG, &ohds)); 1214 dsphys->ds_deadlist_obj = dsl_deadlist_clone(&ohds->ds_deadlist, 1215 dsphys->ds_prev_snap_txg, dsphys->ds_prev_snap_obj, tx); 1216 dsl_dataset_rele(ohds, FTAG); 1217 1218 if (spa_version(dp->dp_spa) >= SPA_VERSION_NEXT_CLONES) { 1219 if (dsl_dataset_phys(origin)->ds_next_clones_obj == 0) { 1220 dsl_dataset_phys(origin)->ds_next_clones_obj = 1221 zap_create(mos, 1222 DMU_OT_NEXT_CLONES, DMU_OT_NONE, 0, tx); 1223 } 1224 VERIFY0(zap_add_int(mos, 1225 dsl_dataset_phys(origin)->ds_next_clones_obj, 1226 dsobj, tx)); 1227 } 1228 1229 dmu_buf_will_dirty(dd->dd_dbuf, tx); 1230 dsl_dir_phys(dd)->dd_origin_obj = origin->ds_object; 1231 if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 1232 if (dsl_dir_phys(origin->ds_dir)->dd_clones == 0) { 1233 dmu_buf_will_dirty(origin->ds_dir->dd_dbuf, tx); 1234 dsl_dir_phys(origin->ds_dir)->dd_clones = 1235 zap_create(mos, 1236 DMU_OT_DSL_CLONES, DMU_OT_NONE, 0, tx); 1237 } 1238 VERIFY0(zap_add_int(mos, 1239 dsl_dir_phys(origin->ds_dir)->dd_clones, 1240 dsobj, tx)); 1241 } 1242 } 1243 1244 /* handle encryption */ 1245 dsl_dataset_create_crypt_sync(dsobj, dd, origin, dcp, tx); 1246 1247 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE) 1248 dsphys->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 1249 1250 dmu_buf_rele(dbuf, FTAG); 1251 1252 dmu_buf_will_dirty(dd->dd_dbuf, tx); 1253 dsl_dir_phys(dd)->dd_head_dataset_obj = dsobj; 1254 1255 return (dsobj); 1256 } 1257 1258 static void 1259 dsl_dataset_zero_zil(dsl_dataset_t *ds, dmu_tx_t *tx) 1260 { 1261 objset_t *os; 1262 1263 VERIFY0(dmu_objset_from_ds(ds, &os)); 1264 if (memcmp(&os->os_zil_header, &zero_zil, sizeof (zero_zil)) != 0) { 1265 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1266 zio_t *zio; 1267 1268 memset(&os->os_zil_header, 0, sizeof (os->os_zil_header)); 1269 if (os->os_encrypted) 1270 os->os_next_write_raw[tx->tx_txg & TXG_MASK] = B_TRUE; 1271 1272 zio = zio_root(dp->dp_spa, NULL, NULL, ZIO_FLAG_MUSTSUCCEED); 1273 dsl_dataset_sync(ds, zio, tx); 1274 VERIFY0(zio_wait(zio)); 1275 dsl_dataset_sync_done(ds, tx); 1276 } 1277 } 1278 1279 uint64_t 1280 dsl_dataset_create_sync(dsl_dir_t *pdd, const char *lastname, 1281 dsl_dataset_t *origin, uint64_t flags, cred_t *cr, 1282 dsl_crypto_params_t *dcp, dmu_tx_t *tx) 1283 { 1284 dsl_pool_t *dp = pdd->dd_pool; 1285 uint64_t dsobj, ddobj; 1286 dsl_dir_t *dd; 1287 1288 ASSERT(dmu_tx_is_syncing(tx)); 1289 ASSERT(lastname[0] != '@'); 1290 /* 1291 * Filesystems will eventually have their origin set to dp_origin_snap, 1292 * but that's taken care of in dsl_dataset_create_sync_dd. When 1293 * creating a filesystem, this function is called with origin equal to 1294 * NULL. 1295 */ 1296 if (origin != NULL) 1297 ASSERT3P(origin, !=, dp->dp_origin_snap); 1298 1299 ddobj = dsl_dir_create_sync(dp, pdd, lastname, tx); 1300 VERIFY0(dsl_dir_hold_obj(dp, ddobj, lastname, FTAG, &dd)); 1301 1302 dsobj = dsl_dataset_create_sync_dd(dd, origin, dcp, 1303 flags & ~DS_CREATE_FLAG_NODIRTY, tx); 1304 1305 dsl_deleg_set_create_perms(dd, tx, cr); 1306 1307 /* 1308 * If we are creating a clone and the livelist feature is enabled, 1309 * add the entry DD_FIELD_LIVELIST to ZAP. 1310 */ 1311 if (origin != NULL && 1312 spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_LIVELIST)) { 1313 objset_t *mos = dd->dd_pool->dp_meta_objset; 1314 dsl_dir_zapify(dd, tx); 1315 uint64_t obj = dsl_deadlist_alloc(mos, tx); 1316 VERIFY0(zap_add(mos, dd->dd_object, DD_FIELD_LIVELIST, 1317 sizeof (uint64_t), 1, &obj, tx)); 1318 spa_feature_incr(dp->dp_spa, SPA_FEATURE_LIVELIST, tx); 1319 } 1320 1321 /* 1322 * Since we're creating a new node we know it's a leaf, so we can 1323 * initialize the counts if the limit feature is active. 1324 */ 1325 if (spa_feature_is_active(dp->dp_spa, SPA_FEATURE_FS_SS_LIMIT)) { 1326 uint64_t cnt = 0; 1327 objset_t *os = dd->dd_pool->dp_meta_objset; 1328 1329 dsl_dir_zapify(dd, tx); 1330 VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_FILESYSTEM_COUNT, 1331 sizeof (cnt), 1, &cnt, tx)); 1332 VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_SNAPSHOT_COUNT, 1333 sizeof (cnt), 1, &cnt, tx)); 1334 } 1335 1336 dsl_dir_rele(dd, FTAG); 1337 1338 /* 1339 * If we are creating a clone, make sure we zero out any stale 1340 * data from the origin snapshots zil header. 1341 */ 1342 if (origin != NULL && !(flags & DS_CREATE_FLAG_NODIRTY)) { 1343 dsl_dataset_t *ds; 1344 1345 VERIFY0(dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds)); 1346 dsl_dataset_zero_zil(ds, tx); 1347 dsl_dataset_rele(ds, FTAG); 1348 } 1349 1350 return (dsobj); 1351 } 1352 1353 /* 1354 * The unique space in the head dataset can be calculated by subtracting 1355 * the space used in the most recent snapshot, that is still being used 1356 * in this file system, from the space currently in use. To figure out 1357 * the space in the most recent snapshot still in use, we need to take 1358 * the total space used in the snapshot and subtract out the space that 1359 * has been freed up since the snapshot was taken. 1360 */ 1361 void 1362 dsl_dataset_recalc_head_uniq(dsl_dataset_t *ds) 1363 { 1364 uint64_t mrs_used; 1365 uint64_t dlused, dlcomp, dluncomp; 1366 1367 ASSERT(!ds->ds_is_snapshot); 1368 1369 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) 1370 mrs_used = dsl_dataset_phys(ds->ds_prev)->ds_referenced_bytes; 1371 else 1372 mrs_used = 0; 1373 1374 dsl_deadlist_space(&ds->ds_deadlist, &dlused, &dlcomp, &dluncomp); 1375 1376 ASSERT3U(dlused, <=, mrs_used); 1377 dsl_dataset_phys(ds)->ds_unique_bytes = 1378 dsl_dataset_phys(ds)->ds_referenced_bytes - (mrs_used - dlused); 1379 1380 if (spa_version(ds->ds_dir->dd_pool->dp_spa) >= 1381 SPA_VERSION_UNIQUE_ACCURATE) 1382 dsl_dataset_phys(ds)->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 1383 } 1384 1385 void 1386 dsl_dataset_remove_from_next_clones(dsl_dataset_t *ds, uint64_t obj, 1387 dmu_tx_t *tx) 1388 { 1389 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 1390 uint64_t count __maybe_unused; 1391 int err; 1392 1393 ASSERT(dsl_dataset_phys(ds)->ds_num_children >= 2); 1394 err = zap_remove_int(mos, dsl_dataset_phys(ds)->ds_next_clones_obj, 1395 obj, tx); 1396 /* 1397 * The err should not be ENOENT, but a bug in a previous version 1398 * of the code could cause upgrade_clones_cb() to not set 1399 * ds_next_snap_obj when it should, leading to a missing entry. 1400 * If we knew that the pool was created after 1401 * SPA_VERSION_NEXT_CLONES, we could assert that it isn't 1402 * ENOENT. However, at least we can check that we don't have 1403 * too many entries in the next_clones_obj even after failing to 1404 * remove this one. 1405 */ 1406 if (err != ENOENT) 1407 VERIFY0(err); 1408 ASSERT0(zap_count(mos, dsl_dataset_phys(ds)->ds_next_clones_obj, 1409 &count)); 1410 ASSERT3U(count, <=, dsl_dataset_phys(ds)->ds_num_children - 2); 1411 } 1412 1413 1414 blkptr_t * 1415 dsl_dataset_get_blkptr(dsl_dataset_t *ds) 1416 { 1417 return (&dsl_dataset_phys(ds)->ds_bp); 1418 } 1419 1420 spa_t * 1421 dsl_dataset_get_spa(dsl_dataset_t *ds) 1422 { 1423 return (ds->ds_dir->dd_pool->dp_spa); 1424 } 1425 1426 void 1427 dsl_dataset_dirty(dsl_dataset_t *ds, dmu_tx_t *tx) 1428 { 1429 dsl_pool_t *dp; 1430 1431 if (ds == NULL) /* this is the meta-objset */ 1432 return; 1433 1434 ASSERT(ds->ds_objset != NULL); 1435 1436 if (dsl_dataset_phys(ds)->ds_next_snap_obj != 0) 1437 panic("dirtying snapshot!"); 1438 1439 /* Must not dirty a dataset in the same txg where it got snapshotted. */ 1440 ASSERT3U(tx->tx_txg, >, dsl_dataset_phys(ds)->ds_prev_snap_txg); 1441 1442 dp = ds->ds_dir->dd_pool; 1443 if (txg_list_add(&dp->dp_dirty_datasets, ds, tx->tx_txg)) { 1444 objset_t *os = ds->ds_objset; 1445 1446 /* up the hold count until we can be written out */ 1447 dmu_buf_add_ref(ds->ds_dbuf, ds); 1448 1449 /* if this dataset is encrypted, grab a reference to the DCK */ 1450 if (ds->ds_dir->dd_crypto_obj != 0 && 1451 !os->os_raw_receive && 1452 !os->os_next_write_raw[tx->tx_txg & TXG_MASK]) { 1453 ASSERT3P(ds->ds_key_mapping, !=, NULL); 1454 key_mapping_add_ref(ds->ds_key_mapping, ds); 1455 } 1456 } 1457 } 1458 1459 static int 1460 dsl_dataset_snapshot_reserve_space(dsl_dataset_t *ds, dmu_tx_t *tx) 1461 { 1462 uint64_t asize; 1463 1464 if (!dmu_tx_is_syncing(tx)) 1465 return (0); 1466 1467 /* 1468 * If there's an fs-only reservation, any blocks that might become 1469 * owned by the snapshot dataset must be accommodated by space 1470 * outside of the reservation. 1471 */ 1472 ASSERT(ds->ds_reserved == 0 || DS_UNIQUE_IS_ACCURATE(ds)); 1473 asize = MIN(dsl_dataset_phys(ds)->ds_unique_bytes, ds->ds_reserved); 1474 if (asize > dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE)) 1475 return (SET_ERROR(ENOSPC)); 1476 1477 /* 1478 * Propagate any reserved space for this snapshot to other 1479 * snapshot checks in this sync group. 1480 */ 1481 if (asize > 0) 1482 dsl_dir_willuse_space(ds->ds_dir, asize, tx); 1483 1484 return (0); 1485 } 1486 1487 int 1488 dsl_dataset_snapshot_check_impl(dsl_dataset_t *ds, const char *snapname, 1489 dmu_tx_t *tx, boolean_t recv, uint64_t cnt, cred_t *cr, proc_t *proc) 1490 { 1491 int error; 1492 uint64_t value; 1493 1494 ds->ds_trysnap_txg = tx->tx_txg; 1495 1496 if (!dmu_tx_is_syncing(tx)) 1497 return (0); 1498 1499 /* 1500 * We don't allow multiple snapshots of the same txg. If there 1501 * is already one, try again. 1502 */ 1503 if (dsl_dataset_phys(ds)->ds_prev_snap_txg >= tx->tx_txg) 1504 return (SET_ERROR(EAGAIN)); 1505 1506 /* 1507 * Check for conflicting snapshot name. 1508 */ 1509 error = dsl_dataset_snap_lookup(ds, snapname, &value); 1510 if (error == 0) 1511 return (SET_ERROR(EEXIST)); 1512 if (error != ENOENT) 1513 return (error); 1514 1515 /* 1516 * We don't allow taking snapshots of inconsistent datasets, such as 1517 * those into which we are currently receiving. However, if we are 1518 * creating this snapshot as part of a receive, this check will be 1519 * executed atomically with respect to the completion of the receive 1520 * itself but prior to the clearing of DS_FLAG_INCONSISTENT; in this 1521 * case we ignore this, knowing it will be fixed up for us shortly in 1522 * dmu_recv_end_sync(). 1523 */ 1524 if (!recv && DS_IS_INCONSISTENT(ds)) 1525 return (SET_ERROR(EBUSY)); 1526 1527 /* 1528 * Skip the check for temporary snapshots or if we have already checked 1529 * the counts in dsl_dataset_snapshot_check. This means we really only 1530 * check the count here when we're receiving a stream. 1531 */ 1532 if (cnt != 0 && cr != NULL) { 1533 error = dsl_fs_ss_limit_check(ds->ds_dir, cnt, 1534 ZFS_PROP_SNAPSHOT_LIMIT, NULL, cr, proc); 1535 if (error != 0) 1536 return (error); 1537 } 1538 1539 error = dsl_dataset_snapshot_reserve_space(ds, tx); 1540 if (error != 0) 1541 return (error); 1542 1543 return (0); 1544 } 1545 1546 int 1547 dsl_dataset_snapshot_check(void *arg, dmu_tx_t *tx) 1548 { 1549 dsl_dataset_snapshot_arg_t *ddsa = arg; 1550 dsl_pool_t *dp = dmu_tx_pool(tx); 1551 nvpair_t *pair; 1552 int rv = 0; 1553 1554 /* 1555 * Pre-compute how many total new snapshots will be created for each 1556 * level in the tree and below. This is needed for validating the 1557 * snapshot limit when either taking a recursive snapshot or when 1558 * taking multiple snapshots. 1559 * 1560 * The problem is that the counts are not actually adjusted when 1561 * we are checking, only when we finally sync. For a single snapshot, 1562 * this is easy, the count will increase by 1 at each node up the tree, 1563 * but its more complicated for the recursive/multiple snapshot case. 1564 * 1565 * The dsl_fs_ss_limit_check function does recursively check the count 1566 * at each level up the tree but since it is validating each snapshot 1567 * independently we need to be sure that we are validating the complete 1568 * count for the entire set of snapshots. We do this by rolling up the 1569 * counts for each component of the name into an nvlist and then 1570 * checking each of those cases with the aggregated count. 1571 * 1572 * This approach properly handles not only the recursive snapshot 1573 * case (where we get all of those on the ddsa_snaps list) but also 1574 * the sibling case (e.g. snapshot a/b and a/c so that we will also 1575 * validate the limit on 'a' using a count of 2). 1576 * 1577 * We validate the snapshot names in the third loop and only report 1578 * name errors once. 1579 */ 1580 if (dmu_tx_is_syncing(tx)) { 1581 char *nm; 1582 nvlist_t *cnt_track = NULL; 1583 cnt_track = fnvlist_alloc(); 1584 1585 nm = kmem_alloc(MAXPATHLEN, KM_SLEEP); 1586 1587 /* Rollup aggregated counts into the cnt_track list */ 1588 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL); 1589 pair != NULL; 1590 pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) { 1591 char *pdelim; 1592 uint64_t val; 1593 1594 (void) strlcpy(nm, nvpair_name(pair), MAXPATHLEN); 1595 pdelim = strchr(nm, '@'); 1596 if (pdelim == NULL) 1597 continue; 1598 *pdelim = '\0'; 1599 1600 do { 1601 if (nvlist_lookup_uint64(cnt_track, nm, 1602 &val) == 0) { 1603 /* update existing entry */ 1604 fnvlist_add_uint64(cnt_track, nm, 1605 val + 1); 1606 } else { 1607 /* add to list */ 1608 fnvlist_add_uint64(cnt_track, nm, 1); 1609 } 1610 1611 pdelim = strrchr(nm, '/'); 1612 if (pdelim != NULL) 1613 *pdelim = '\0'; 1614 } while (pdelim != NULL); 1615 } 1616 1617 kmem_free(nm, MAXPATHLEN); 1618 1619 /* Check aggregated counts at each level */ 1620 for (pair = nvlist_next_nvpair(cnt_track, NULL); 1621 pair != NULL; pair = nvlist_next_nvpair(cnt_track, pair)) { 1622 int error = 0; 1623 const char *name; 1624 uint64_t cnt = 0; 1625 dsl_dataset_t *ds; 1626 1627 name = nvpair_name(pair); 1628 cnt = fnvpair_value_uint64(pair); 1629 ASSERT(cnt > 0); 1630 1631 error = dsl_dataset_hold(dp, name, FTAG, &ds); 1632 if (error == 0) { 1633 error = dsl_fs_ss_limit_check(ds->ds_dir, cnt, 1634 ZFS_PROP_SNAPSHOT_LIMIT, NULL, 1635 ddsa->ddsa_cr, ddsa->ddsa_proc); 1636 dsl_dataset_rele(ds, FTAG); 1637 } 1638 1639 if (error != 0) { 1640 if (ddsa->ddsa_errors != NULL) 1641 fnvlist_add_int32(ddsa->ddsa_errors, 1642 name, error); 1643 rv = error; 1644 /* only report one error for this check */ 1645 break; 1646 } 1647 } 1648 nvlist_free(cnt_track); 1649 } 1650 1651 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL); 1652 pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) { 1653 int error = 0; 1654 dsl_dataset_t *ds; 1655 const char *name, *atp = NULL; 1656 char dsname[ZFS_MAX_DATASET_NAME_LEN]; 1657 1658 name = nvpair_name(pair); 1659 if (strlen(name) >= ZFS_MAX_DATASET_NAME_LEN) 1660 error = SET_ERROR(ENAMETOOLONG); 1661 if (error == 0) { 1662 atp = strchr(name, '@'); 1663 if (atp == NULL) 1664 error = SET_ERROR(EINVAL); 1665 if (error == 0) 1666 (void) strlcpy(dsname, name, atp - name + 1); 1667 } 1668 if (error == 0) 1669 error = dsl_dataset_hold(dp, dsname, FTAG, &ds); 1670 if (error == 0) { 1671 /* passing 0/NULL skips dsl_fs_ss_limit_check */ 1672 error = dsl_dataset_snapshot_check_impl(ds, 1673 atp + 1, tx, B_FALSE, 0, NULL, NULL); 1674 dsl_dataset_rele(ds, FTAG); 1675 } 1676 1677 if (error != 0) { 1678 if (ddsa->ddsa_errors != NULL) { 1679 fnvlist_add_int32(ddsa->ddsa_errors, 1680 name, error); 1681 } 1682 rv = error; 1683 } 1684 } 1685 1686 return (rv); 1687 } 1688 1689 void 1690 dsl_dataset_snapshot_sync_impl(dsl_dataset_t *ds, const char *snapname, 1691 dmu_tx_t *tx) 1692 { 1693 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1694 dmu_buf_t *dbuf; 1695 dsl_dataset_phys_t *dsphys; 1696 uint64_t dsobj, crtxg; 1697 objset_t *mos = dp->dp_meta_objset; 1698 objset_t *os __maybe_unused; 1699 1700 ASSERT(RRW_WRITE_HELD(&dp->dp_config_rwlock)); 1701 1702 /* 1703 * If we are on an old pool, the zil must not be active, in which 1704 * case it will be zeroed. Usually zil_suspend() accomplishes this. 1705 */ 1706 ASSERT(spa_version(dmu_tx_pool(tx)->dp_spa) >= SPA_VERSION_FAST_SNAP || 1707 dmu_objset_from_ds(ds, &os) != 0 || 1708 memcmp(&os->os_phys->os_zil_header, &zero_zil, 1709 sizeof (zero_zil)) == 0); 1710 1711 /* Should not snapshot a dirty dataset. */ 1712 ASSERT(!txg_list_member(&ds->ds_dir->dd_pool->dp_dirty_datasets, 1713 ds, tx->tx_txg)); 1714 1715 dsl_fs_ss_count_adjust(ds->ds_dir, 1, DD_FIELD_SNAPSHOT_COUNT, tx); 1716 1717 /* 1718 * The origin's ds_creation_txg has to be < TXG_INITIAL 1719 */ 1720 if (strcmp(snapname, ORIGIN_DIR_NAME) == 0) 1721 crtxg = 1; 1722 else 1723 crtxg = tx->tx_txg; 1724 1725 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, 1726 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); 1727 VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); 1728 dmu_buf_will_dirty(dbuf, tx); 1729 dsphys = dbuf->db_data; 1730 memset(dsphys, 0, sizeof (dsl_dataset_phys_t)); 1731 dsphys->ds_dir_obj = ds->ds_dir->dd_object; 1732 dsphys->ds_fsid_guid = unique_create(); 1733 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, 1734 sizeof (dsphys->ds_guid)); 1735 dsphys->ds_prev_snap_obj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 1736 dsphys->ds_prev_snap_txg = dsl_dataset_phys(ds)->ds_prev_snap_txg; 1737 dsphys->ds_next_snap_obj = ds->ds_object; 1738 dsphys->ds_num_children = 1; 1739 dsphys->ds_creation_time = gethrestime_sec(); 1740 dsphys->ds_creation_txg = crtxg; 1741 dsphys->ds_deadlist_obj = dsl_dataset_phys(ds)->ds_deadlist_obj; 1742 dsphys->ds_referenced_bytes = dsl_dataset_phys(ds)->ds_referenced_bytes; 1743 dsphys->ds_compressed_bytes = dsl_dataset_phys(ds)->ds_compressed_bytes; 1744 dsphys->ds_uncompressed_bytes = 1745 dsl_dataset_phys(ds)->ds_uncompressed_bytes; 1746 dsphys->ds_flags = dsl_dataset_phys(ds)->ds_flags; 1747 rrw_enter(&ds->ds_bp_rwlock, RW_READER, FTAG); 1748 dsphys->ds_bp = dsl_dataset_phys(ds)->ds_bp; 1749 rrw_exit(&ds->ds_bp_rwlock, FTAG); 1750 dmu_buf_rele(dbuf, FTAG); 1751 1752 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 1753 if (zfeature_active(f, ds->ds_feature[f])) { 1754 dsl_dataset_activate_feature(dsobj, f, 1755 ds->ds_feature[f], tx); 1756 } 1757 } 1758 1759 ASSERT3U(ds->ds_prev != 0, ==, 1760 dsl_dataset_phys(ds)->ds_prev_snap_obj != 0); 1761 if (ds->ds_prev) { 1762 uint64_t next_clones_obj = 1763 dsl_dataset_phys(ds->ds_prev)->ds_next_clones_obj; 1764 ASSERT(dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj == 1765 ds->ds_object || 1766 dsl_dataset_phys(ds->ds_prev)->ds_num_children > 1); 1767 if (dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj == 1768 ds->ds_object) { 1769 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); 1770 ASSERT3U(dsl_dataset_phys(ds)->ds_prev_snap_txg, ==, 1771 dsl_dataset_phys(ds->ds_prev)->ds_creation_txg); 1772 dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj = dsobj; 1773 } else if (next_clones_obj != 0) { 1774 dsl_dataset_remove_from_next_clones(ds->ds_prev, 1775 dsphys->ds_next_snap_obj, tx); 1776 VERIFY0(zap_add_int(mos, 1777 next_clones_obj, dsobj, tx)); 1778 } 1779 } 1780 1781 /* 1782 * If we have a reference-reservation on this dataset, we will 1783 * need to increase the amount of refreservation being charged 1784 * since our unique space is going to zero. 1785 */ 1786 if (ds->ds_reserved) { 1787 int64_t delta; 1788 ASSERT(DS_UNIQUE_IS_ACCURATE(ds)); 1789 delta = MIN(dsl_dataset_phys(ds)->ds_unique_bytes, 1790 ds->ds_reserved); 1791 dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV, 1792 delta, 0, 0, tx); 1793 } 1794 1795 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1796 dsl_dataset_phys(ds)->ds_deadlist_obj = 1797 dsl_deadlist_clone(&ds->ds_deadlist, UINT64_MAX, 1798 dsl_dataset_phys(ds)->ds_prev_snap_obj, tx); 1799 dsl_deadlist_close(&ds->ds_deadlist); 1800 dsl_deadlist_open(&ds->ds_deadlist, mos, 1801 dsl_dataset_phys(ds)->ds_deadlist_obj); 1802 dsl_deadlist_add_key(&ds->ds_deadlist, 1803 dsl_dataset_phys(ds)->ds_prev_snap_txg, tx); 1804 dsl_bookmark_snapshotted(ds, tx); 1805 1806 if (dsl_dataset_remap_deadlist_exists(ds)) { 1807 uint64_t remap_deadlist_obj = 1808 dsl_dataset_get_remap_deadlist_object(ds); 1809 /* 1810 * Move the remap_deadlist to the snapshot. The head 1811 * will create a new remap deadlist on demand, from 1812 * dsl_dataset_block_remapped(). 1813 */ 1814 dsl_dataset_unset_remap_deadlist_object(ds, tx); 1815 dsl_deadlist_close(&ds->ds_remap_deadlist); 1816 1817 dmu_object_zapify(mos, dsobj, DMU_OT_DSL_DATASET, tx); 1818 VERIFY0(zap_add(mos, dsobj, DS_FIELD_REMAP_DEADLIST, 1819 sizeof (remap_deadlist_obj), 1, &remap_deadlist_obj, tx)); 1820 } 1821 1822 /* 1823 * Create a ivset guid for this snapshot if the dataset is 1824 * encrypted. This may be overridden by a raw receive. A 1825 * previous implementation of this code did not have this 1826 * field as part of the on-disk format for ZFS encryption 1827 * (see errata #4). As part of the remediation for this 1828 * issue, we ask the user to enable the bookmark_v2 feature 1829 * which is now a dependency of the encryption feature. We 1830 * use this as a heuristic to determine when the user has 1831 * elected to correct any datasets created with the old code. 1832 * As a result, we only do this step if the bookmark_v2 1833 * feature is enabled, which limits the number of states a 1834 * given pool / dataset can be in with regards to terms of 1835 * correcting the issue. 1836 */ 1837 if (ds->ds_dir->dd_crypto_obj != 0 && 1838 spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_BOOKMARK_V2)) { 1839 uint64_t ivset_guid = unique_create(); 1840 1841 dmu_object_zapify(mos, dsobj, DMU_OT_DSL_DATASET, tx); 1842 VERIFY0(zap_add(mos, dsobj, DS_FIELD_IVSET_GUID, 1843 sizeof (ivset_guid), 1, &ivset_guid, tx)); 1844 } 1845 1846 ASSERT3U(dsl_dataset_phys(ds)->ds_prev_snap_txg, <, tx->tx_txg); 1847 dsl_dataset_phys(ds)->ds_prev_snap_obj = dsobj; 1848 dsl_dataset_phys(ds)->ds_prev_snap_txg = crtxg; 1849 dsl_dataset_phys(ds)->ds_unique_bytes = 0; 1850 1851 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE) 1852 dsl_dataset_phys(ds)->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 1853 1854 VERIFY0(zap_add(mos, dsl_dataset_phys(ds)->ds_snapnames_zapobj, 1855 snapname, 8, 1, &dsobj, tx)); 1856 1857 if (ds->ds_prev) 1858 dsl_dataset_rele(ds->ds_prev, ds); 1859 VERIFY0(dsl_dataset_hold_obj(dp, 1860 dsl_dataset_phys(ds)->ds_prev_snap_obj, ds, &ds->ds_prev)); 1861 1862 dsl_scan_ds_snapshotted(ds, tx); 1863 1864 dsl_dir_snap_cmtime_update(ds->ds_dir, tx); 1865 1866 if (zfs_snapshot_history_enabled) 1867 spa_history_log_internal_ds(ds->ds_prev, "snapshot", tx, " "); 1868 } 1869 1870 void 1871 dsl_dataset_snapshot_sync(void *arg, dmu_tx_t *tx) 1872 { 1873 dsl_dataset_snapshot_arg_t *ddsa = arg; 1874 dsl_pool_t *dp = dmu_tx_pool(tx); 1875 nvpair_t *pair; 1876 1877 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL); 1878 pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) { 1879 dsl_dataset_t *ds; 1880 const char *name, *atp; 1881 char dsname[ZFS_MAX_DATASET_NAME_LEN]; 1882 1883 name = nvpair_name(pair); 1884 atp = strchr(name, '@'); 1885 (void) strlcpy(dsname, name, atp - name + 1); 1886 VERIFY0(dsl_dataset_hold(dp, dsname, FTAG, &ds)); 1887 1888 dsl_dataset_snapshot_sync_impl(ds, atp + 1, tx); 1889 if (ddsa->ddsa_props != NULL) { 1890 dsl_props_set_sync_impl(ds->ds_prev, 1891 ZPROP_SRC_LOCAL, ddsa->ddsa_props, tx); 1892 } 1893 dsl_dataset_rele(ds, FTAG); 1894 } 1895 } 1896 1897 /* 1898 * The snapshots must all be in the same pool. 1899 * All-or-nothing: if there are any failures, nothing will be modified. 1900 */ 1901 int 1902 dsl_dataset_snapshot(nvlist_t *snaps, nvlist_t *props, nvlist_t *errors) 1903 { 1904 dsl_dataset_snapshot_arg_t ddsa; 1905 nvpair_t *pair; 1906 boolean_t needsuspend; 1907 int error; 1908 spa_t *spa; 1909 const char *firstname; 1910 nvlist_t *suspended = NULL; 1911 1912 pair = nvlist_next_nvpair(snaps, NULL); 1913 if (pair == NULL) 1914 return (0); 1915 firstname = nvpair_name(pair); 1916 1917 error = spa_open(firstname, &spa, FTAG); 1918 if (error != 0) 1919 return (error); 1920 needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP); 1921 spa_close(spa, FTAG); 1922 1923 if (needsuspend) { 1924 suspended = fnvlist_alloc(); 1925 for (pair = nvlist_next_nvpair(snaps, NULL); pair != NULL; 1926 pair = nvlist_next_nvpair(snaps, pair)) { 1927 char fsname[ZFS_MAX_DATASET_NAME_LEN]; 1928 const char *snapname = nvpair_name(pair); 1929 const char *atp; 1930 void *cookie; 1931 1932 atp = strchr(snapname, '@'); 1933 if (atp == NULL) { 1934 error = SET_ERROR(EINVAL); 1935 break; 1936 } 1937 (void) strlcpy(fsname, snapname, atp - snapname + 1); 1938 1939 error = zil_suspend(fsname, &cookie); 1940 if (error != 0) 1941 break; 1942 fnvlist_add_uint64(suspended, fsname, 1943 (uintptr_t)cookie); 1944 } 1945 } 1946 1947 ddsa.ddsa_snaps = snaps; 1948 ddsa.ddsa_props = props; 1949 ddsa.ddsa_errors = errors; 1950 ddsa.ddsa_cr = CRED(); 1951 ddsa.ddsa_proc = curproc; 1952 1953 if (error == 0) { 1954 error = dsl_sync_task(firstname, dsl_dataset_snapshot_check, 1955 dsl_dataset_snapshot_sync, &ddsa, 1956 fnvlist_num_pairs(snaps) * 3, ZFS_SPACE_CHECK_NORMAL); 1957 } 1958 1959 if (suspended != NULL) { 1960 for (pair = nvlist_next_nvpair(suspended, NULL); pair != NULL; 1961 pair = nvlist_next_nvpair(suspended, pair)) { 1962 zil_resume((void *)(uintptr_t) 1963 fnvpair_value_uint64(pair)); 1964 } 1965 fnvlist_free(suspended); 1966 } 1967 1968 if (error == 0) { 1969 for (pair = nvlist_next_nvpair(snaps, NULL); pair != NULL; 1970 pair = nvlist_next_nvpair(snaps, pair)) { 1971 zvol_create_minor(nvpair_name(pair)); 1972 } 1973 } 1974 1975 return (error); 1976 } 1977 1978 typedef struct dsl_dataset_snapshot_tmp_arg { 1979 const char *ddsta_fsname; 1980 const char *ddsta_snapname; 1981 minor_t ddsta_cleanup_minor; 1982 const char *ddsta_htag; 1983 } dsl_dataset_snapshot_tmp_arg_t; 1984 1985 static int 1986 dsl_dataset_snapshot_tmp_check(void *arg, dmu_tx_t *tx) 1987 { 1988 dsl_dataset_snapshot_tmp_arg_t *ddsta = arg; 1989 dsl_pool_t *dp = dmu_tx_pool(tx); 1990 dsl_dataset_t *ds; 1991 int error; 1992 1993 error = dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds); 1994 if (error != 0) 1995 return (error); 1996 1997 /* NULL cred means no limit check for tmp snapshot */ 1998 error = dsl_dataset_snapshot_check_impl(ds, ddsta->ddsta_snapname, 1999 tx, B_FALSE, 0, NULL, NULL); 2000 if (error != 0) { 2001 dsl_dataset_rele(ds, FTAG); 2002 return (error); 2003 } 2004 2005 if (spa_version(dp->dp_spa) < SPA_VERSION_USERREFS) { 2006 dsl_dataset_rele(ds, FTAG); 2007 return (SET_ERROR(ENOTSUP)); 2008 } 2009 error = dsl_dataset_user_hold_check_one(NULL, ddsta->ddsta_htag, 2010 B_TRUE, tx); 2011 if (error != 0) { 2012 dsl_dataset_rele(ds, FTAG); 2013 return (error); 2014 } 2015 2016 dsl_dataset_rele(ds, FTAG); 2017 return (0); 2018 } 2019 2020 static void 2021 dsl_dataset_snapshot_tmp_sync(void *arg, dmu_tx_t *tx) 2022 { 2023 dsl_dataset_snapshot_tmp_arg_t *ddsta = arg; 2024 dsl_pool_t *dp = dmu_tx_pool(tx); 2025 dsl_dataset_t *ds = NULL; 2026 2027 VERIFY0(dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds)); 2028 2029 dsl_dataset_snapshot_sync_impl(ds, ddsta->ddsta_snapname, tx); 2030 dsl_dataset_user_hold_sync_one(ds->ds_prev, ddsta->ddsta_htag, 2031 ddsta->ddsta_cleanup_minor, gethrestime_sec(), tx); 2032 dsl_destroy_snapshot_sync_impl(ds->ds_prev, B_TRUE, tx); 2033 2034 dsl_dataset_rele(ds, FTAG); 2035 } 2036 2037 int 2038 dsl_dataset_snapshot_tmp(const char *fsname, const char *snapname, 2039 minor_t cleanup_minor, const char *htag) 2040 { 2041 dsl_dataset_snapshot_tmp_arg_t ddsta; 2042 int error; 2043 spa_t *spa; 2044 boolean_t needsuspend; 2045 void *cookie; 2046 2047 ddsta.ddsta_fsname = fsname; 2048 ddsta.ddsta_snapname = snapname; 2049 ddsta.ddsta_cleanup_minor = cleanup_minor; 2050 ddsta.ddsta_htag = htag; 2051 2052 error = spa_open(fsname, &spa, FTAG); 2053 if (error != 0) 2054 return (error); 2055 needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP); 2056 spa_close(spa, FTAG); 2057 2058 if (needsuspend) { 2059 error = zil_suspend(fsname, &cookie); 2060 if (error != 0) 2061 return (error); 2062 } 2063 2064 error = dsl_sync_task(fsname, dsl_dataset_snapshot_tmp_check, 2065 dsl_dataset_snapshot_tmp_sync, &ddsta, 3, ZFS_SPACE_CHECK_RESERVED); 2066 2067 if (needsuspend) 2068 zil_resume(cookie); 2069 return (error); 2070 } 2071 2072 /* Nonblocking dataset sync. Assumes dataset:objset is always 1:1 */ 2073 void 2074 dsl_dataset_sync(dsl_dataset_t *ds, zio_t *rio, dmu_tx_t *tx) 2075 { 2076 ASSERT(dmu_tx_is_syncing(tx)); 2077 ASSERT(ds->ds_objset != NULL); 2078 ASSERT(dsl_dataset_phys(ds)->ds_next_snap_obj == 0); 2079 2080 /* 2081 * in case we had to change ds_fsid_guid when we opened it, 2082 * sync it out now. 2083 */ 2084 dmu_buf_will_dirty(ds->ds_dbuf, tx); 2085 dsl_dataset_phys(ds)->ds_fsid_guid = ds->ds_fsid_guid; 2086 2087 if (ds->ds_resume_bytes[tx->tx_txg & TXG_MASK] != 0) { 2088 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset, 2089 ds->ds_object, DS_FIELD_RESUME_OBJECT, 8, 1, 2090 &ds->ds_resume_object[tx->tx_txg & TXG_MASK], tx)); 2091 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset, 2092 ds->ds_object, DS_FIELD_RESUME_OFFSET, 8, 1, 2093 &ds->ds_resume_offset[tx->tx_txg & TXG_MASK], tx)); 2094 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset, 2095 ds->ds_object, DS_FIELD_RESUME_BYTES, 8, 1, 2096 &ds->ds_resume_bytes[tx->tx_txg & TXG_MASK], tx)); 2097 ds->ds_resume_object[tx->tx_txg & TXG_MASK] = 0; 2098 ds->ds_resume_offset[tx->tx_txg & TXG_MASK] = 0; 2099 ds->ds_resume_bytes[tx->tx_txg & TXG_MASK] = 0; 2100 } 2101 2102 dmu_objset_sync(ds->ds_objset, rio, tx); 2103 } 2104 2105 /* 2106 * Check if the percentage of blocks shared between the clone and the 2107 * snapshot (as opposed to those that are clone only) is below a certain 2108 * threshold 2109 */ 2110 static boolean_t 2111 dsl_livelist_should_disable(dsl_dataset_t *ds) 2112 { 2113 uint64_t used, referenced; 2114 int percent_shared; 2115 2116 used = dsl_dir_get_usedds(ds->ds_dir); 2117 referenced = dsl_get_referenced(ds); 2118 if (referenced == 0) 2119 return (B_FALSE); 2120 percent_shared = (100 * (referenced - used)) / referenced; 2121 if (percent_shared <= zfs_livelist_min_percent_shared) 2122 return (B_TRUE); 2123 return (B_FALSE); 2124 } 2125 2126 /* 2127 * Check if it is possible to combine two livelist entries into one. 2128 * This is the case if the combined number of 'live' blkptrs (ALLOCs that 2129 * don't have a matching FREE) is under the maximum sublist size. 2130 * We check this by subtracting twice the total number of frees from the total 2131 * number of blkptrs. FREEs are counted twice because each FREE blkptr 2132 * will cancel out an ALLOC blkptr when the livelist is processed. 2133 */ 2134 static boolean_t 2135 dsl_livelist_should_condense(dsl_deadlist_entry_t *first, 2136 dsl_deadlist_entry_t *next) 2137 { 2138 uint64_t total_free = first->dle_bpobj.bpo_phys->bpo_num_freed + 2139 next->dle_bpobj.bpo_phys->bpo_num_freed; 2140 uint64_t total_entries = first->dle_bpobj.bpo_phys->bpo_num_blkptrs + 2141 next->dle_bpobj.bpo_phys->bpo_num_blkptrs; 2142 if ((total_entries - (2 * total_free)) < zfs_livelist_max_entries) 2143 return (B_TRUE); 2144 return (B_FALSE); 2145 } 2146 2147 typedef struct try_condense_arg { 2148 spa_t *spa; 2149 dsl_dataset_t *ds; 2150 } try_condense_arg_t; 2151 2152 /* 2153 * Iterate over the livelist entries, searching for a pair to condense. 2154 * A nonzero return value means stop, 0 means keep looking. 2155 */ 2156 static int 2157 dsl_livelist_try_condense(void *arg, dsl_deadlist_entry_t *first) 2158 { 2159 try_condense_arg_t *tca = arg; 2160 spa_t *spa = tca->spa; 2161 dsl_dataset_t *ds = tca->ds; 2162 dsl_deadlist_t *ll = &ds->ds_dir->dd_livelist; 2163 dsl_deadlist_entry_t *next; 2164 2165 /* The condense thread has not yet been created at import */ 2166 if (spa->spa_livelist_condense_zthr == NULL) 2167 return (1); 2168 2169 /* A condense is already in progress */ 2170 if (spa->spa_to_condense.ds != NULL) 2171 return (1); 2172 2173 next = AVL_NEXT(&ll->dl_tree, &first->dle_node); 2174 /* The livelist has only one entry - don't condense it */ 2175 if (next == NULL) 2176 return (1); 2177 2178 /* Next is the newest entry - don't condense it */ 2179 if (AVL_NEXT(&ll->dl_tree, &next->dle_node) == NULL) 2180 return (1); 2181 2182 /* This pair is not ready to condense but keep looking */ 2183 if (!dsl_livelist_should_condense(first, next)) 2184 return (0); 2185 2186 /* 2187 * Add a ref to prevent the dataset from being evicted while 2188 * the condense zthr or synctask are running. Ref will be 2189 * released at the end of the condense synctask 2190 */ 2191 dmu_buf_add_ref(ds->ds_dbuf, spa); 2192 2193 spa->spa_to_condense.ds = ds; 2194 spa->spa_to_condense.first = first; 2195 spa->spa_to_condense.next = next; 2196 spa->spa_to_condense.syncing = B_FALSE; 2197 spa->spa_to_condense.cancelled = B_FALSE; 2198 2199 zthr_wakeup(spa->spa_livelist_condense_zthr); 2200 return (1); 2201 } 2202 2203 static void 2204 dsl_flush_pending_livelist(dsl_dataset_t *ds, dmu_tx_t *tx) 2205 { 2206 dsl_dir_t *dd = ds->ds_dir; 2207 spa_t *spa = ds->ds_dir->dd_pool->dp_spa; 2208 dsl_deadlist_entry_t *last = dsl_deadlist_last(&dd->dd_livelist); 2209 2210 /* Check if we need to add a new sub-livelist */ 2211 if (last == NULL) { 2212 /* The livelist is empty */ 2213 dsl_deadlist_add_key(&dd->dd_livelist, 2214 tx->tx_txg - 1, tx); 2215 } else if (spa_sync_pass(spa) == 1) { 2216 /* 2217 * Check if the newest entry is full. If it is, make a new one. 2218 * We only do this once per sync because we could overfill a 2219 * sublist in one sync pass and don't want to add another entry 2220 * for a txg that is already represented. This ensures that 2221 * blkptrs born in the same txg are stored in the same sublist. 2222 */ 2223 bpobj_t bpobj = last->dle_bpobj; 2224 uint64_t all = bpobj.bpo_phys->bpo_num_blkptrs; 2225 uint64_t free = bpobj.bpo_phys->bpo_num_freed; 2226 uint64_t alloc = all - free; 2227 if (alloc > zfs_livelist_max_entries) { 2228 dsl_deadlist_add_key(&dd->dd_livelist, 2229 tx->tx_txg - 1, tx); 2230 } 2231 } 2232 2233 /* Insert each entry into the on-disk livelist */ 2234 bplist_iterate(&dd->dd_pending_allocs, 2235 dsl_deadlist_insert_alloc_cb, &dd->dd_livelist, tx); 2236 bplist_iterate(&dd->dd_pending_frees, 2237 dsl_deadlist_insert_free_cb, &dd->dd_livelist, tx); 2238 2239 /* Attempt to condense every pair of adjacent entries */ 2240 try_condense_arg_t arg = { 2241 .spa = spa, 2242 .ds = ds 2243 }; 2244 dsl_deadlist_iterate(&dd->dd_livelist, dsl_livelist_try_condense, 2245 &arg); 2246 } 2247 2248 void 2249 dsl_dataset_sync_done(dsl_dataset_t *ds, dmu_tx_t *tx) 2250 { 2251 objset_t *os = ds->ds_objset; 2252 2253 bplist_iterate(&ds->ds_pending_deadlist, 2254 dsl_deadlist_insert_alloc_cb, &ds->ds_deadlist, tx); 2255 2256 if (dsl_deadlist_is_open(&ds->ds_dir->dd_livelist)) { 2257 dsl_flush_pending_livelist(ds, tx); 2258 if (dsl_livelist_should_disable(ds)) { 2259 dsl_dir_remove_livelist(ds->ds_dir, tx, B_TRUE); 2260 } 2261 } 2262 2263 dsl_bookmark_sync_done(ds, tx); 2264 2265 multilist_destroy(&os->os_synced_dnodes); 2266 2267 if (os->os_encrypted) 2268 os->os_next_write_raw[tx->tx_txg & TXG_MASK] = B_FALSE; 2269 else 2270 ASSERT0(os->os_next_write_raw[tx->tx_txg & TXG_MASK]); 2271 2272 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 2273 if (zfeature_active(f, 2274 ds->ds_feature_activation[f])) { 2275 if (zfeature_active(f, ds->ds_feature[f])) 2276 continue; 2277 dsl_dataset_activate_feature(ds->ds_object, f, 2278 ds->ds_feature_activation[f], tx); 2279 ds->ds_feature[f] = ds->ds_feature_activation[f]; 2280 } 2281 } 2282 2283 ASSERT(!dmu_objset_is_dirty(os, dmu_tx_get_txg(tx))); 2284 } 2285 2286 int 2287 get_clones_stat_impl(dsl_dataset_t *ds, nvlist_t *val) 2288 { 2289 uint64_t count = 0; 2290 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 2291 zap_cursor_t zc; 2292 zap_attribute_t za; 2293 2294 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool)); 2295 2296 /* 2297 * There may be missing entries in ds_next_clones_obj 2298 * due to a bug in a previous version of the code. 2299 * Only trust it if it has the right number of entries. 2300 */ 2301 if (dsl_dataset_phys(ds)->ds_next_clones_obj != 0) { 2302 VERIFY0(zap_count(mos, dsl_dataset_phys(ds)->ds_next_clones_obj, 2303 &count)); 2304 } 2305 if (count != dsl_dataset_phys(ds)->ds_num_children - 1) { 2306 return (SET_ERROR(ENOENT)); 2307 } 2308 for (zap_cursor_init(&zc, mos, 2309 dsl_dataset_phys(ds)->ds_next_clones_obj); 2310 zap_cursor_retrieve(&zc, &za) == 0; 2311 zap_cursor_advance(&zc)) { 2312 dsl_dataset_t *clone; 2313 char buf[ZFS_MAX_DATASET_NAME_LEN]; 2314 VERIFY0(dsl_dataset_hold_obj(ds->ds_dir->dd_pool, 2315 za.za_first_integer, FTAG, &clone)); 2316 dsl_dir_name(clone->ds_dir, buf); 2317 fnvlist_add_boolean(val, buf); 2318 dsl_dataset_rele(clone, FTAG); 2319 } 2320 zap_cursor_fini(&zc); 2321 return (0); 2322 } 2323 2324 void 2325 get_clones_stat(dsl_dataset_t *ds, nvlist_t *nv) 2326 { 2327 nvlist_t *propval = fnvlist_alloc(); 2328 nvlist_t *val = fnvlist_alloc(); 2329 2330 if (get_clones_stat_impl(ds, val) == 0) { 2331 fnvlist_add_nvlist(propval, ZPROP_VALUE, val); 2332 fnvlist_add_nvlist(nv, zfs_prop_to_name(ZFS_PROP_CLONES), 2333 propval); 2334 } 2335 2336 nvlist_free(val); 2337 nvlist_free(propval); 2338 } 2339 2340 static char * 2341 get_receive_resume_token_impl(dsl_dataset_t *ds) 2342 { 2343 if (!dsl_dataset_has_resume_receive_state(ds)) 2344 return (NULL); 2345 2346 dsl_pool_t *dp = ds->ds_dir->dd_pool; 2347 char *str; 2348 void *packed; 2349 uint8_t *compressed; 2350 uint64_t val; 2351 nvlist_t *token_nv = fnvlist_alloc(); 2352 size_t packed_size, compressed_size; 2353 2354 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 2355 DS_FIELD_RESUME_FROMGUID, sizeof (val), 1, &val) == 0) { 2356 fnvlist_add_uint64(token_nv, "fromguid", val); 2357 } 2358 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 2359 DS_FIELD_RESUME_OBJECT, sizeof (val), 1, &val) == 0) { 2360 fnvlist_add_uint64(token_nv, "object", val); 2361 } 2362 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 2363 DS_FIELD_RESUME_OFFSET, sizeof (val), 1, &val) == 0) { 2364 fnvlist_add_uint64(token_nv, "offset", val); 2365 } 2366 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 2367 DS_FIELD_RESUME_BYTES, sizeof (val), 1, &val) == 0) { 2368 fnvlist_add_uint64(token_nv, "bytes", val); 2369 } 2370 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 2371 DS_FIELD_RESUME_TOGUID, sizeof (val), 1, &val) == 0) { 2372 fnvlist_add_uint64(token_nv, "toguid", val); 2373 } 2374 char buf[MAXNAMELEN]; 2375 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 2376 DS_FIELD_RESUME_TONAME, 1, sizeof (buf), buf) == 0) { 2377 fnvlist_add_string(token_nv, "toname", buf); 2378 } 2379 if (zap_contains(dp->dp_meta_objset, ds->ds_object, 2380 DS_FIELD_RESUME_LARGEBLOCK) == 0) { 2381 fnvlist_add_boolean(token_nv, "largeblockok"); 2382 } 2383 if (zap_contains(dp->dp_meta_objset, ds->ds_object, 2384 DS_FIELD_RESUME_EMBEDOK) == 0) { 2385 fnvlist_add_boolean(token_nv, "embedok"); 2386 } 2387 if (zap_contains(dp->dp_meta_objset, ds->ds_object, 2388 DS_FIELD_RESUME_COMPRESSOK) == 0) { 2389 fnvlist_add_boolean(token_nv, "compressok"); 2390 } 2391 if (zap_contains(dp->dp_meta_objset, ds->ds_object, 2392 DS_FIELD_RESUME_RAWOK) == 0) { 2393 fnvlist_add_boolean(token_nv, "rawok"); 2394 } 2395 if (dsl_dataset_feature_is_active(ds, 2396 SPA_FEATURE_REDACTED_DATASETS)) { 2397 uint64_t num_redact_snaps = 0; 2398 uint64_t *redact_snaps = NULL; 2399 VERIFY3B(dsl_dataset_get_uint64_array_feature(ds, 2400 SPA_FEATURE_REDACTED_DATASETS, &num_redact_snaps, 2401 &redact_snaps), ==, B_TRUE); 2402 fnvlist_add_uint64_array(token_nv, "redact_snaps", 2403 redact_snaps, num_redact_snaps); 2404 } 2405 if (zap_contains(dp->dp_meta_objset, ds->ds_object, 2406 DS_FIELD_RESUME_REDACT_BOOKMARK_SNAPS) == 0) { 2407 uint64_t num_redact_snaps = 0, int_size = 0; 2408 uint64_t *redact_snaps = NULL; 2409 VERIFY0(zap_length(dp->dp_meta_objset, ds->ds_object, 2410 DS_FIELD_RESUME_REDACT_BOOKMARK_SNAPS, &int_size, 2411 &num_redact_snaps)); 2412 ASSERT3U(int_size, ==, sizeof (uint64_t)); 2413 2414 redact_snaps = kmem_alloc(int_size * num_redact_snaps, 2415 KM_SLEEP); 2416 VERIFY0(zap_lookup(dp->dp_meta_objset, ds->ds_object, 2417 DS_FIELD_RESUME_REDACT_BOOKMARK_SNAPS, int_size, 2418 num_redact_snaps, redact_snaps)); 2419 fnvlist_add_uint64_array(token_nv, "book_redact_snaps", 2420 redact_snaps, num_redact_snaps); 2421 kmem_free(redact_snaps, int_size * num_redact_snaps); 2422 } 2423 packed = fnvlist_pack(token_nv, &packed_size); 2424 fnvlist_free(token_nv); 2425 compressed = kmem_alloc(packed_size, KM_SLEEP); 2426 2427 compressed_size = gzip_compress(packed, compressed, 2428 packed_size, packed_size, 6); 2429 2430 zio_cksum_t cksum; 2431 fletcher_4_native_varsize(compressed, compressed_size, &cksum); 2432 2433 size_t alloc_size = compressed_size * 2 + 1; 2434 str = kmem_alloc(alloc_size, KM_SLEEP); 2435 for (int i = 0; i < compressed_size; i++) { 2436 size_t offset = i * 2; 2437 (void) snprintf(str + offset, alloc_size - offset, 2438 "%02x", compressed[i]); 2439 } 2440 str[compressed_size * 2] = '\0'; 2441 char *propval = kmem_asprintf("%u-%llx-%llx-%s", 2442 ZFS_SEND_RESUME_TOKEN_VERSION, 2443 (longlong_t)cksum.zc_word[0], 2444 (longlong_t)packed_size, str); 2445 kmem_free(packed, packed_size); 2446 kmem_free(str, alloc_size); 2447 kmem_free(compressed, packed_size); 2448 return (propval); 2449 } 2450 2451 /* 2452 * Returns a string that represents the receive resume state token. It should 2453 * be freed with strfree(). NULL is returned if no resume state is present. 2454 */ 2455 char * 2456 get_receive_resume_token(dsl_dataset_t *ds) 2457 { 2458 /* 2459 * A failed "newfs" (e.g. full) resumable receive leaves 2460 * the stats set on this dataset. Check here for the prop. 2461 */ 2462 char *token = get_receive_resume_token_impl(ds); 2463 if (token != NULL) 2464 return (token); 2465 /* 2466 * A failed incremental resumable receive leaves the 2467 * stats set on our child named "%recv". Check the child 2468 * for the prop. 2469 */ 2470 /* 6 extra bytes for /%recv */ 2471 char name[ZFS_MAX_DATASET_NAME_LEN + 6]; 2472 dsl_dataset_t *recv_ds; 2473 dsl_dataset_name(ds, name); 2474 if (strlcat(name, "/", sizeof (name)) < sizeof (name) && 2475 strlcat(name, recv_clone_name, sizeof (name)) < sizeof (name) && 2476 dsl_dataset_hold(ds->ds_dir->dd_pool, name, FTAG, &recv_ds) == 0) { 2477 token = get_receive_resume_token_impl(recv_ds); 2478 dsl_dataset_rele(recv_ds, FTAG); 2479 } 2480 return (token); 2481 } 2482 2483 uint64_t 2484 dsl_get_refratio(dsl_dataset_t *ds) 2485 { 2486 uint64_t ratio = dsl_dataset_phys(ds)->ds_compressed_bytes == 0 ? 100 : 2487 (dsl_dataset_phys(ds)->ds_uncompressed_bytes * 100 / 2488 dsl_dataset_phys(ds)->ds_compressed_bytes); 2489 return (ratio); 2490 } 2491 2492 uint64_t 2493 dsl_get_logicalreferenced(dsl_dataset_t *ds) 2494 { 2495 return (dsl_dataset_phys(ds)->ds_uncompressed_bytes); 2496 } 2497 2498 uint64_t 2499 dsl_get_compressratio(dsl_dataset_t *ds) 2500 { 2501 if (ds->ds_is_snapshot) { 2502 return (dsl_get_refratio(ds)); 2503 } else { 2504 dsl_dir_t *dd = ds->ds_dir; 2505 mutex_enter(&dd->dd_lock); 2506 uint64_t val = dsl_dir_get_compressratio(dd); 2507 mutex_exit(&dd->dd_lock); 2508 return (val); 2509 } 2510 } 2511 2512 uint64_t 2513 dsl_get_used(dsl_dataset_t *ds) 2514 { 2515 if (ds->ds_is_snapshot) { 2516 return (dsl_dataset_phys(ds)->ds_unique_bytes); 2517 } else { 2518 dsl_dir_t *dd = ds->ds_dir; 2519 mutex_enter(&dd->dd_lock); 2520 uint64_t val = dsl_dir_get_used(dd); 2521 mutex_exit(&dd->dd_lock); 2522 return (val); 2523 } 2524 } 2525 2526 uint64_t 2527 dsl_get_creation(dsl_dataset_t *ds) 2528 { 2529 return (dsl_dataset_phys(ds)->ds_creation_time); 2530 } 2531 2532 uint64_t 2533 dsl_get_creationtxg(dsl_dataset_t *ds) 2534 { 2535 return (dsl_dataset_phys(ds)->ds_creation_txg); 2536 } 2537 2538 uint64_t 2539 dsl_get_refquota(dsl_dataset_t *ds) 2540 { 2541 return (ds->ds_quota); 2542 } 2543 2544 uint64_t 2545 dsl_get_refreservation(dsl_dataset_t *ds) 2546 { 2547 return (ds->ds_reserved); 2548 } 2549 2550 uint64_t 2551 dsl_get_guid(dsl_dataset_t *ds) 2552 { 2553 return (dsl_dataset_phys(ds)->ds_guid); 2554 } 2555 2556 uint64_t 2557 dsl_get_unique(dsl_dataset_t *ds) 2558 { 2559 return (dsl_dataset_phys(ds)->ds_unique_bytes); 2560 } 2561 2562 uint64_t 2563 dsl_get_objsetid(dsl_dataset_t *ds) 2564 { 2565 return (ds->ds_object); 2566 } 2567 2568 uint64_t 2569 dsl_get_userrefs(dsl_dataset_t *ds) 2570 { 2571 return (ds->ds_userrefs); 2572 } 2573 2574 uint64_t 2575 dsl_get_defer_destroy(dsl_dataset_t *ds) 2576 { 2577 return (DS_IS_DEFER_DESTROY(ds) ? 1 : 0); 2578 } 2579 2580 uint64_t 2581 dsl_get_referenced(dsl_dataset_t *ds) 2582 { 2583 return (dsl_dataset_phys(ds)->ds_referenced_bytes); 2584 } 2585 2586 uint64_t 2587 dsl_get_numclones(dsl_dataset_t *ds) 2588 { 2589 ASSERT(ds->ds_is_snapshot); 2590 return (dsl_dataset_phys(ds)->ds_num_children - 1); 2591 } 2592 2593 uint64_t 2594 dsl_get_inconsistent(dsl_dataset_t *ds) 2595 { 2596 return ((dsl_dataset_phys(ds)->ds_flags & DS_FLAG_INCONSISTENT) ? 2597 1 : 0); 2598 } 2599 2600 uint64_t 2601 dsl_get_redacted(dsl_dataset_t *ds) 2602 { 2603 return (dsl_dataset_feature_is_active(ds, 2604 SPA_FEATURE_REDACTED_DATASETS)); 2605 } 2606 2607 uint64_t 2608 dsl_get_available(dsl_dataset_t *ds) 2609 { 2610 uint64_t refdbytes = dsl_get_referenced(ds); 2611 uint64_t availbytes = dsl_dir_space_available(ds->ds_dir, 2612 NULL, 0, TRUE); 2613 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes) { 2614 availbytes += 2615 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes; 2616 } 2617 if (ds->ds_quota != 0) { 2618 /* 2619 * Adjust available bytes according to refquota 2620 */ 2621 if (refdbytes < ds->ds_quota) { 2622 availbytes = MIN(availbytes, 2623 ds->ds_quota - refdbytes); 2624 } else { 2625 availbytes = 0; 2626 } 2627 } 2628 return (availbytes); 2629 } 2630 2631 int 2632 dsl_get_written(dsl_dataset_t *ds, uint64_t *written) 2633 { 2634 dsl_pool_t *dp = ds->ds_dir->dd_pool; 2635 dsl_dataset_t *prev; 2636 int err = dsl_dataset_hold_obj(dp, 2637 dsl_dataset_phys(ds)->ds_prev_snap_obj, FTAG, &prev); 2638 if (err == 0) { 2639 uint64_t comp, uncomp; 2640 err = dsl_dataset_space_written(prev, ds, written, 2641 &comp, &uncomp); 2642 dsl_dataset_rele(prev, FTAG); 2643 } 2644 return (err); 2645 } 2646 2647 /* 2648 * 'snap' should be a buffer of size ZFS_MAX_DATASET_NAME_LEN. 2649 */ 2650 int 2651 dsl_get_prev_snap(dsl_dataset_t *ds, char *snap) 2652 { 2653 dsl_pool_t *dp = ds->ds_dir->dd_pool; 2654 if (ds->ds_prev != NULL && ds->ds_prev != dp->dp_origin_snap) { 2655 dsl_dataset_name(ds->ds_prev, snap); 2656 return (0); 2657 } else { 2658 return (SET_ERROR(ENOENT)); 2659 } 2660 } 2661 2662 void 2663 dsl_get_redact_snaps(dsl_dataset_t *ds, nvlist_t *propval) 2664 { 2665 uint64_t nsnaps; 2666 uint64_t *snaps; 2667 if (dsl_dataset_get_uint64_array_feature(ds, 2668 SPA_FEATURE_REDACTED_DATASETS, &nsnaps, &snaps)) { 2669 fnvlist_add_uint64_array(propval, ZPROP_VALUE, snaps, 2670 nsnaps); 2671 } 2672 } 2673 2674 /* 2675 * Returns the mountpoint property and source for the given dataset in the value 2676 * and source buffers. The value buffer must be at least as large as MAXPATHLEN 2677 * and the source buffer as least as large a ZFS_MAX_DATASET_NAME_LEN. 2678 * Returns 0 on success and an error on failure. 2679 */ 2680 int 2681 dsl_get_mountpoint(dsl_dataset_t *ds, const char *dsname, char *value, 2682 char *source) 2683 { 2684 int error; 2685 dsl_pool_t *dp = ds->ds_dir->dd_pool; 2686 2687 /* Retrieve the mountpoint value stored in the zap object */ 2688 error = dsl_prop_get_ds(ds, zfs_prop_to_name(ZFS_PROP_MOUNTPOINT), 1, 2689 ZAP_MAXVALUELEN, value, source); 2690 if (error != 0) { 2691 return (error); 2692 } 2693 2694 /* 2695 * Process the dsname and source to find the full mountpoint string. 2696 * Can be skipped for 'legacy' or 'none'. 2697 */ 2698 if (value[0] == '/') { 2699 char *buf = kmem_alloc(ZAP_MAXVALUELEN, KM_SLEEP); 2700 char *root = buf; 2701 const char *relpath; 2702 2703 /* 2704 * If we inherit the mountpoint, even from a dataset 2705 * with a received value, the source will be the path of 2706 * the dataset we inherit from. If source is 2707 * ZPROP_SOURCE_VAL_RECVD, the received value is not 2708 * inherited. 2709 */ 2710 if (strcmp(source, ZPROP_SOURCE_VAL_RECVD) == 0) { 2711 relpath = ""; 2712 } else { 2713 ASSERT0(strncmp(dsname, source, strlen(source))); 2714 relpath = dsname + strlen(source); 2715 if (relpath[0] == '/') 2716 relpath++; 2717 } 2718 2719 spa_altroot(dp->dp_spa, root, ZAP_MAXVALUELEN); 2720 2721 /* 2722 * Special case an alternate root of '/'. This will 2723 * avoid having multiple leading slashes in the 2724 * mountpoint path. 2725 */ 2726 if (strcmp(root, "/") == 0) 2727 root++; 2728 2729 /* 2730 * If the mountpoint is '/' then skip over this 2731 * if we are obtaining either an alternate root or 2732 * an inherited mountpoint. 2733 */ 2734 char *mnt = value; 2735 if (value[1] == '\0' && (root[0] != '\0' || 2736 relpath[0] != '\0')) 2737 mnt = value + 1; 2738 2739 mnt = kmem_strdup(mnt); 2740 2741 if (relpath[0] == '\0') { 2742 (void) snprintf(value, ZAP_MAXVALUELEN, "%s%s", 2743 root, mnt); 2744 } else { 2745 (void) snprintf(value, ZAP_MAXVALUELEN, "%s%s%s%s", 2746 root, mnt, relpath[0] == '@' ? "" : "/", 2747 relpath); 2748 } 2749 kmem_free(buf, ZAP_MAXVALUELEN); 2750 kmem_strfree(mnt); 2751 } 2752 2753 return (0); 2754 } 2755 2756 void 2757 dsl_dataset_stats(dsl_dataset_t *ds, nvlist_t *nv) 2758 { 2759 dsl_pool_t *dp __maybe_unused = ds->ds_dir->dd_pool; 2760 2761 ASSERT(dsl_pool_config_held(dp)); 2762 2763 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRATIO, 2764 dsl_get_refratio(ds)); 2765 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_LOGICALREFERENCED, 2766 dsl_get_logicalreferenced(ds)); 2767 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_COMPRESSRATIO, 2768 dsl_get_compressratio(ds)); 2769 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USED, 2770 dsl_get_used(ds)); 2771 2772 if (ds->ds_is_snapshot) { 2773 get_clones_stat(ds, nv); 2774 } else { 2775 char buf[ZFS_MAX_DATASET_NAME_LEN]; 2776 if (dsl_get_prev_snap(ds, buf) == 0) 2777 dsl_prop_nvlist_add_string(nv, ZFS_PROP_PREV_SNAP, 2778 buf); 2779 dsl_dir_stats(ds->ds_dir, nv); 2780 } 2781 2782 nvlist_t *propval = fnvlist_alloc(); 2783 dsl_get_redact_snaps(ds, propval); 2784 fnvlist_add_nvlist(nv, zfs_prop_to_name(ZFS_PROP_REDACT_SNAPS), 2785 propval); 2786 nvlist_free(propval); 2787 2788 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_AVAILABLE, 2789 dsl_get_available(ds)); 2790 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFERENCED, 2791 dsl_get_referenced(ds)); 2792 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATION, 2793 dsl_get_creation(ds)); 2794 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATETXG, 2795 dsl_get_creationtxg(ds)); 2796 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFQUOTA, 2797 dsl_get_refquota(ds)); 2798 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRESERVATION, 2799 dsl_get_refreservation(ds)); 2800 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_GUID, 2801 dsl_get_guid(ds)); 2802 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_UNIQUE, 2803 dsl_get_unique(ds)); 2804 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_OBJSETID, 2805 dsl_get_objsetid(ds)); 2806 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USERREFS, 2807 dsl_get_userrefs(ds)); 2808 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_DEFER_DESTROY, 2809 dsl_get_defer_destroy(ds)); 2810 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_SNAPSHOTS_CHANGED, 2811 dsl_dir_snap_cmtime(ds->ds_dir).tv_sec); 2812 dsl_dataset_crypt_stats(ds, nv); 2813 2814 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) { 2815 uint64_t written; 2816 if (dsl_get_written(ds, &written) == 0) { 2817 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_WRITTEN, 2818 written); 2819 } 2820 } 2821 2822 if (!dsl_dataset_is_snapshot(ds)) { 2823 char *token = get_receive_resume_token(ds); 2824 if (token != NULL) { 2825 dsl_prop_nvlist_add_string(nv, 2826 ZFS_PROP_RECEIVE_RESUME_TOKEN, token); 2827 kmem_strfree(token); 2828 } 2829 } 2830 } 2831 2832 void 2833 dsl_dataset_fast_stat(dsl_dataset_t *ds, dmu_objset_stats_t *stat) 2834 { 2835 dsl_pool_t *dp __maybe_unused = ds->ds_dir->dd_pool; 2836 ASSERT(dsl_pool_config_held(dp)); 2837 2838 stat->dds_creation_txg = dsl_get_creationtxg(ds); 2839 stat->dds_inconsistent = dsl_get_inconsistent(ds); 2840 stat->dds_guid = dsl_get_guid(ds); 2841 stat->dds_redacted = dsl_get_redacted(ds); 2842 stat->dds_origin[0] = '\0'; 2843 if (ds->ds_is_snapshot) { 2844 stat->dds_is_snapshot = B_TRUE; 2845 stat->dds_num_clones = dsl_get_numclones(ds); 2846 } else { 2847 stat->dds_is_snapshot = B_FALSE; 2848 stat->dds_num_clones = 0; 2849 2850 if (dsl_dir_is_clone(ds->ds_dir)) { 2851 dsl_dir_get_origin(ds->ds_dir, stat->dds_origin); 2852 } 2853 } 2854 } 2855 2856 uint64_t 2857 dsl_dataset_fsid_guid(dsl_dataset_t *ds) 2858 { 2859 return (ds->ds_fsid_guid); 2860 } 2861 2862 void 2863 dsl_dataset_space(dsl_dataset_t *ds, 2864 uint64_t *refdbytesp, uint64_t *availbytesp, 2865 uint64_t *usedobjsp, uint64_t *availobjsp) 2866 { 2867 *refdbytesp = dsl_dataset_phys(ds)->ds_referenced_bytes; 2868 *availbytesp = dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE); 2869 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes) 2870 *availbytesp += 2871 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes; 2872 if (ds->ds_quota != 0) { 2873 /* 2874 * Adjust available bytes according to refquota 2875 */ 2876 if (*refdbytesp < ds->ds_quota) 2877 *availbytesp = MIN(*availbytesp, 2878 ds->ds_quota - *refdbytesp); 2879 else 2880 *availbytesp = 0; 2881 } 2882 rrw_enter(&ds->ds_bp_rwlock, RW_READER, FTAG); 2883 *usedobjsp = BP_GET_FILL(&dsl_dataset_phys(ds)->ds_bp); 2884 rrw_exit(&ds->ds_bp_rwlock, FTAG); 2885 *availobjsp = DN_MAX_OBJECT - *usedobjsp; 2886 } 2887 2888 boolean_t 2889 dsl_dataset_modified_since_snap(dsl_dataset_t *ds, dsl_dataset_t *snap) 2890 { 2891 dsl_pool_t *dp __maybe_unused = ds->ds_dir->dd_pool; 2892 uint64_t birth; 2893 2894 ASSERT(dsl_pool_config_held(dp)); 2895 if (snap == NULL) 2896 return (B_FALSE); 2897 rrw_enter(&ds->ds_bp_rwlock, RW_READER, FTAG); 2898 birth = dsl_dataset_get_blkptr(ds)->blk_birth; 2899 rrw_exit(&ds->ds_bp_rwlock, FTAG); 2900 if (birth > dsl_dataset_phys(snap)->ds_creation_txg) { 2901 objset_t *os, *os_snap; 2902 /* 2903 * It may be that only the ZIL differs, because it was 2904 * reset in the head. Don't count that as being 2905 * modified. 2906 */ 2907 if (dmu_objset_from_ds(ds, &os) != 0) 2908 return (B_TRUE); 2909 if (dmu_objset_from_ds(snap, &os_snap) != 0) 2910 return (B_TRUE); 2911 return (memcmp(&os->os_phys->os_meta_dnode, 2912 &os_snap->os_phys->os_meta_dnode, 2913 sizeof (os->os_phys->os_meta_dnode)) != 0); 2914 } 2915 return (B_FALSE); 2916 } 2917 2918 static int 2919 dsl_dataset_rename_snapshot_check_impl(dsl_pool_t *dp, 2920 dsl_dataset_t *hds, void *arg) 2921 { 2922 (void) dp; 2923 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 2924 int error; 2925 uint64_t val; 2926 2927 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val); 2928 if (error != 0) { 2929 /* ignore nonexistent snapshots */ 2930 return (error == ENOENT ? 0 : error); 2931 } 2932 2933 /* new name should not exist */ 2934 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_newsnapname, &val); 2935 if (error == 0) 2936 error = SET_ERROR(EEXIST); 2937 else if (error == ENOENT) 2938 error = 0; 2939 2940 /* dataset name + 1 for the "@" + the new snapshot name must fit */ 2941 if (dsl_dir_namelen(hds->ds_dir) + 1 + 2942 strlen(ddrsa->ddrsa_newsnapname) >= ZFS_MAX_DATASET_NAME_LEN) 2943 error = SET_ERROR(ENAMETOOLONG); 2944 2945 return (error); 2946 } 2947 2948 int 2949 dsl_dataset_rename_snapshot_check(void *arg, dmu_tx_t *tx) 2950 { 2951 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 2952 dsl_pool_t *dp = dmu_tx_pool(tx); 2953 dsl_dataset_t *hds; 2954 int error; 2955 2956 error = dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds); 2957 if (error != 0) 2958 return (error); 2959 2960 if (ddrsa->ddrsa_recursive) { 2961 error = dmu_objset_find_dp(dp, hds->ds_dir->dd_object, 2962 dsl_dataset_rename_snapshot_check_impl, ddrsa, 2963 DS_FIND_CHILDREN); 2964 } else { 2965 error = dsl_dataset_rename_snapshot_check_impl(dp, hds, ddrsa); 2966 } 2967 dsl_dataset_rele(hds, FTAG); 2968 return (error); 2969 } 2970 2971 static int 2972 dsl_dataset_rename_snapshot_sync_impl(dsl_pool_t *dp, 2973 dsl_dataset_t *hds, void *arg) 2974 { 2975 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 2976 dsl_dataset_t *ds; 2977 uint64_t val; 2978 dmu_tx_t *tx = ddrsa->ddrsa_tx; 2979 int error; 2980 2981 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val); 2982 ASSERT(error == 0 || error == ENOENT); 2983 if (error == ENOENT) { 2984 /* ignore nonexistent snapshots */ 2985 return (0); 2986 } 2987 2988 VERIFY0(dsl_dataset_hold_obj(dp, val, FTAG, &ds)); 2989 2990 /* log before we change the name */ 2991 spa_history_log_internal_ds(ds, "rename", tx, 2992 "-> @%s", ddrsa->ddrsa_newsnapname); 2993 2994 VERIFY0(dsl_dataset_snap_remove(hds, ddrsa->ddrsa_oldsnapname, tx, 2995 B_FALSE)); 2996 mutex_enter(&ds->ds_lock); 2997 (void) strlcpy(ds->ds_snapname, ddrsa->ddrsa_newsnapname, 2998 sizeof (ds->ds_snapname)); 2999 mutex_exit(&ds->ds_lock); 3000 VERIFY0(zap_add(dp->dp_meta_objset, 3001 dsl_dataset_phys(hds)->ds_snapnames_zapobj, 3002 ds->ds_snapname, 8, 1, &ds->ds_object, tx)); 3003 zvol_rename_minors(dp->dp_spa, ddrsa->ddrsa_oldsnapname, 3004 ddrsa->ddrsa_newsnapname, B_TRUE); 3005 3006 dsl_dataset_rele(ds, FTAG); 3007 return (0); 3008 } 3009 3010 void 3011 dsl_dataset_rename_snapshot_sync(void *arg, dmu_tx_t *tx) 3012 { 3013 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 3014 dsl_pool_t *dp = dmu_tx_pool(tx); 3015 dsl_dataset_t *hds = NULL; 3016 3017 VERIFY0(dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds)); 3018 ddrsa->ddrsa_tx = tx; 3019 if (ddrsa->ddrsa_recursive) { 3020 VERIFY0(dmu_objset_find_dp(dp, hds->ds_dir->dd_object, 3021 dsl_dataset_rename_snapshot_sync_impl, ddrsa, 3022 DS_FIND_CHILDREN)); 3023 } else { 3024 VERIFY0(dsl_dataset_rename_snapshot_sync_impl(dp, hds, ddrsa)); 3025 } 3026 dsl_dataset_rele(hds, FTAG); 3027 } 3028 3029 int 3030 dsl_dataset_rename_snapshot(const char *fsname, 3031 const char *oldsnapname, const char *newsnapname, boolean_t recursive) 3032 { 3033 dsl_dataset_rename_snapshot_arg_t ddrsa; 3034 3035 ddrsa.ddrsa_fsname = fsname; 3036 ddrsa.ddrsa_oldsnapname = oldsnapname; 3037 ddrsa.ddrsa_newsnapname = newsnapname; 3038 ddrsa.ddrsa_recursive = recursive; 3039 3040 return (dsl_sync_task(fsname, dsl_dataset_rename_snapshot_check, 3041 dsl_dataset_rename_snapshot_sync, &ddrsa, 3042 1, ZFS_SPACE_CHECK_RESERVED)); 3043 } 3044 3045 /* 3046 * If we're doing an ownership handoff, we need to make sure that there is 3047 * only one long hold on the dataset. We're not allowed to change anything here 3048 * so we don't permanently release the long hold or regular hold here. We want 3049 * to do this only when syncing to avoid the dataset unexpectedly going away 3050 * when we release the long hold. 3051 */ 3052 static int 3053 dsl_dataset_handoff_check(dsl_dataset_t *ds, void *owner, dmu_tx_t *tx) 3054 { 3055 boolean_t held = B_FALSE; 3056 3057 if (!dmu_tx_is_syncing(tx)) 3058 return (0); 3059 3060 dsl_dir_t *dd = ds->ds_dir; 3061 mutex_enter(&dd->dd_activity_lock); 3062 uint64_t holds = zfs_refcount_count(&ds->ds_longholds) - 3063 (owner != NULL ? 1 : 0); 3064 /* 3065 * The value of dd_activity_waiters can chance as soon as we drop the 3066 * lock, but we're fine with that; new waiters coming in or old 3067 * waiters leaving doesn't cause problems, since we're going to cancel 3068 * waiters later anyway. The goal of this check is to verify that no 3069 * non-waiters have long-holds, and all new long-holds will be 3070 * prevented because we're holding the pool config as writer. 3071 */ 3072 if (holds != dd->dd_activity_waiters) 3073 held = B_TRUE; 3074 mutex_exit(&dd->dd_activity_lock); 3075 3076 if (held) 3077 return (SET_ERROR(EBUSY)); 3078 3079 return (0); 3080 } 3081 3082 int 3083 dsl_dataset_rollback_check(void *arg, dmu_tx_t *tx) 3084 { 3085 dsl_dataset_rollback_arg_t *ddra = arg; 3086 dsl_pool_t *dp = dmu_tx_pool(tx); 3087 dsl_dataset_t *ds; 3088 int64_t unused_refres_delta; 3089 int error; 3090 3091 error = dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds); 3092 if (error != 0) 3093 return (error); 3094 3095 /* must not be a snapshot */ 3096 if (ds->ds_is_snapshot) { 3097 dsl_dataset_rele(ds, FTAG); 3098 return (SET_ERROR(EINVAL)); 3099 } 3100 3101 /* must have a most recent snapshot */ 3102 if (dsl_dataset_phys(ds)->ds_prev_snap_txg < TXG_INITIAL) { 3103 dsl_dataset_rele(ds, FTAG); 3104 return (SET_ERROR(ESRCH)); 3105 } 3106 3107 /* 3108 * No rollback to a snapshot created in the current txg, because 3109 * the rollback may dirty the dataset and create blocks that are 3110 * not reachable from the rootbp while having a birth txg that 3111 * falls into the snapshot's range. 3112 */ 3113 if (dmu_tx_is_syncing(tx) && 3114 dsl_dataset_phys(ds)->ds_prev_snap_txg >= tx->tx_txg) { 3115 dsl_dataset_rele(ds, FTAG); 3116 return (SET_ERROR(EAGAIN)); 3117 } 3118 3119 /* 3120 * If the expected target snapshot is specified, then check that 3121 * the latest snapshot is it. 3122 */ 3123 if (ddra->ddra_tosnap != NULL) { 3124 dsl_dataset_t *snapds; 3125 3126 /* Check if the target snapshot exists at all. */ 3127 error = dsl_dataset_hold(dp, ddra->ddra_tosnap, FTAG, &snapds); 3128 if (error != 0) { 3129 /* 3130 * ESRCH is used to signal that the target snapshot does 3131 * not exist, while ENOENT is used to report that 3132 * the rolled back dataset does not exist. 3133 * ESRCH is also used to cover other cases where the 3134 * target snapshot is not related to the dataset being 3135 * rolled back such as being in a different pool. 3136 */ 3137 if (error == ENOENT || error == EXDEV) 3138 error = SET_ERROR(ESRCH); 3139 dsl_dataset_rele(ds, FTAG); 3140 return (error); 3141 } 3142 ASSERT(snapds->ds_is_snapshot); 3143 3144 /* Check if the snapshot is the latest snapshot indeed. */ 3145 if (snapds != ds->ds_prev) { 3146 /* 3147 * Distinguish between the case where the only problem 3148 * is intervening snapshots (EEXIST) vs the snapshot 3149 * not being a valid target for rollback (ESRCH). 3150 */ 3151 if (snapds->ds_dir == ds->ds_dir || 3152 (dsl_dir_is_clone(ds->ds_dir) && 3153 dsl_dir_phys(ds->ds_dir)->dd_origin_obj == 3154 snapds->ds_object)) { 3155 error = SET_ERROR(EEXIST); 3156 } else { 3157 error = SET_ERROR(ESRCH); 3158 } 3159 dsl_dataset_rele(snapds, FTAG); 3160 dsl_dataset_rele(ds, FTAG); 3161 return (error); 3162 } 3163 dsl_dataset_rele(snapds, FTAG); 3164 } 3165 3166 /* must not have any bookmarks after the most recent snapshot */ 3167 if (dsl_bookmark_latest_txg(ds) > 3168 dsl_dataset_phys(ds)->ds_prev_snap_txg) { 3169 dsl_dataset_rele(ds, FTAG); 3170 return (SET_ERROR(EEXIST)); 3171 } 3172 3173 error = dsl_dataset_handoff_check(ds, ddra->ddra_owner, tx); 3174 if (error != 0) { 3175 dsl_dataset_rele(ds, FTAG); 3176 return (error); 3177 } 3178 3179 /* 3180 * Check if the snap we are rolling back to uses more than 3181 * the refquota. 3182 */ 3183 if (ds->ds_quota != 0 && 3184 dsl_dataset_phys(ds->ds_prev)->ds_referenced_bytes > ds->ds_quota) { 3185 dsl_dataset_rele(ds, FTAG); 3186 return (SET_ERROR(EDQUOT)); 3187 } 3188 3189 /* 3190 * When we do the clone swap, we will temporarily use more space 3191 * due to the refreservation (the head will no longer have any 3192 * unique space, so the entire amount of the refreservation will need 3193 * to be free). We will immediately destroy the clone, freeing 3194 * this space, but the freeing happens over many txg's. 3195 */ 3196 unused_refres_delta = (int64_t)MIN(ds->ds_reserved, 3197 dsl_dataset_phys(ds)->ds_unique_bytes); 3198 3199 if (unused_refres_delta > 0 && 3200 unused_refres_delta > 3201 dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE)) { 3202 dsl_dataset_rele(ds, FTAG); 3203 return (SET_ERROR(ENOSPC)); 3204 } 3205 3206 dsl_dataset_rele(ds, FTAG); 3207 return (0); 3208 } 3209 3210 void 3211 dsl_dataset_rollback_sync(void *arg, dmu_tx_t *tx) 3212 { 3213 dsl_dataset_rollback_arg_t *ddra = arg; 3214 dsl_pool_t *dp = dmu_tx_pool(tx); 3215 dsl_dataset_t *ds, *clone; 3216 uint64_t cloneobj; 3217 char namebuf[ZFS_MAX_DATASET_NAME_LEN]; 3218 3219 VERIFY0(dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds)); 3220 3221 dsl_dataset_name(ds->ds_prev, namebuf); 3222 fnvlist_add_string(ddra->ddra_result, "target", namebuf); 3223 3224 cloneobj = dsl_dataset_create_sync(ds->ds_dir, "%rollback", 3225 ds->ds_prev, DS_CREATE_FLAG_NODIRTY, kcred, NULL, tx); 3226 3227 VERIFY0(dsl_dataset_hold_obj(dp, cloneobj, FTAG, &clone)); 3228 3229 dsl_dataset_clone_swap_sync_impl(clone, ds, tx); 3230 dsl_dataset_zero_zil(ds, tx); 3231 3232 dsl_destroy_head_sync_impl(clone, tx); 3233 3234 dsl_dataset_rele(clone, FTAG); 3235 dsl_dataset_rele(ds, FTAG); 3236 } 3237 3238 /* 3239 * Rolls back the given filesystem or volume to the most recent snapshot. 3240 * The name of the most recent snapshot will be returned under key "target" 3241 * in the result nvlist. 3242 * 3243 * If owner != NULL: 3244 * - The existing dataset MUST be owned by the specified owner at entry 3245 * - Upon return, dataset will still be held by the same owner, whether we 3246 * succeed or not. 3247 * 3248 * This mode is required any time the existing filesystem is mounted. See 3249 * notes above zfs_suspend_fs() for further details. 3250 */ 3251 int 3252 dsl_dataset_rollback(const char *fsname, const char *tosnap, void *owner, 3253 nvlist_t *result) 3254 { 3255 dsl_dataset_rollback_arg_t ddra; 3256 3257 ddra.ddra_fsname = fsname; 3258 ddra.ddra_tosnap = tosnap; 3259 ddra.ddra_owner = owner; 3260 ddra.ddra_result = result; 3261 3262 return (dsl_sync_task(fsname, dsl_dataset_rollback_check, 3263 dsl_dataset_rollback_sync, &ddra, 3264 1, ZFS_SPACE_CHECK_RESERVED)); 3265 } 3266 3267 struct promotenode { 3268 list_node_t link; 3269 dsl_dataset_t *ds; 3270 }; 3271 3272 static int snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep); 3273 static int promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp, 3274 const void *tag); 3275 static void promote_rele(dsl_dataset_promote_arg_t *ddpa, const void *tag); 3276 3277 int 3278 dsl_dataset_promote_check(void *arg, dmu_tx_t *tx) 3279 { 3280 dsl_dataset_promote_arg_t *ddpa = arg; 3281 dsl_pool_t *dp = dmu_tx_pool(tx); 3282 dsl_dataset_t *hds; 3283 struct promotenode *snap; 3284 int err; 3285 uint64_t unused; 3286 uint64_t ss_mv_cnt; 3287 size_t max_snap_len; 3288 boolean_t conflicting_snaps; 3289 3290 err = promote_hold(ddpa, dp, FTAG); 3291 if (err != 0) 3292 return (err); 3293 3294 hds = ddpa->ddpa_clone; 3295 max_snap_len = MAXNAMELEN - strlen(ddpa->ddpa_clonename) - 1; 3296 3297 if (dsl_dataset_phys(hds)->ds_flags & DS_FLAG_NOPROMOTE) { 3298 promote_rele(ddpa, FTAG); 3299 return (SET_ERROR(EXDEV)); 3300 } 3301 3302 snap = list_head(&ddpa->shared_snaps); 3303 if (snap == NULL) { 3304 err = SET_ERROR(ENOENT); 3305 goto out; 3306 } 3307 dsl_dataset_t *const origin_ds = snap->ds; 3308 3309 /* 3310 * Encrypted clones share a DSL Crypto Key with their origin's dsl dir. 3311 * When doing a promote we must make sure the encryption root for 3312 * both the target and the target's origin does not change to avoid 3313 * needing to rewrap encryption keys 3314 */ 3315 err = dsl_dataset_promote_crypt_check(hds->ds_dir, origin_ds->ds_dir); 3316 if (err != 0) 3317 goto out; 3318 3319 /* 3320 * Compute and check the amount of space to transfer. Since this is 3321 * so expensive, don't do the preliminary check. 3322 */ 3323 if (!dmu_tx_is_syncing(tx)) { 3324 promote_rele(ddpa, FTAG); 3325 return (0); 3326 } 3327 3328 /* compute origin's new unique space */ 3329 snap = list_tail(&ddpa->clone_snaps); 3330 ASSERT(snap != NULL); 3331 ASSERT3U(dsl_dataset_phys(snap->ds)->ds_prev_snap_obj, ==, 3332 origin_ds->ds_object); 3333 dsl_deadlist_space_range(&snap->ds->ds_deadlist, 3334 dsl_dataset_phys(origin_ds)->ds_prev_snap_txg, UINT64_MAX, 3335 &ddpa->unique, &unused, &unused); 3336 3337 /* 3338 * Walk the snapshots that we are moving 3339 * 3340 * Compute space to transfer. Consider the incremental changes 3341 * to used by each snapshot: 3342 * (my used) = (prev's used) + (blocks born) - (blocks killed) 3343 * So each snapshot gave birth to: 3344 * (blocks born) = (my used) - (prev's used) + (blocks killed) 3345 * So a sequence would look like: 3346 * (uN - u(N-1) + kN) + ... + (u1 - u0 + k1) + (u0 - 0 + k0) 3347 * Which simplifies to: 3348 * uN + kN + kN-1 + ... + k1 + k0 3349 * Note however, if we stop before we reach the ORIGIN we get: 3350 * uN + kN + kN-1 + ... + kM - uM-1 3351 */ 3352 conflicting_snaps = B_FALSE; 3353 ss_mv_cnt = 0; 3354 ddpa->used = dsl_dataset_phys(origin_ds)->ds_referenced_bytes; 3355 ddpa->comp = dsl_dataset_phys(origin_ds)->ds_compressed_bytes; 3356 ddpa->uncomp = dsl_dataset_phys(origin_ds)->ds_uncompressed_bytes; 3357 for (snap = list_head(&ddpa->shared_snaps); snap; 3358 snap = list_next(&ddpa->shared_snaps, snap)) { 3359 uint64_t val, dlused, dlcomp, dluncomp; 3360 dsl_dataset_t *ds = snap->ds; 3361 3362 ss_mv_cnt++; 3363 3364 /* 3365 * If there are long holds, we won't be able to evict 3366 * the objset. 3367 */ 3368 if (dsl_dataset_long_held(ds)) { 3369 err = SET_ERROR(EBUSY); 3370 goto out; 3371 } 3372 3373 /* Check that the snapshot name does not conflict */ 3374 VERIFY0(dsl_dataset_get_snapname(ds)); 3375 if (strlen(ds->ds_snapname) >= max_snap_len) { 3376 err = SET_ERROR(ENAMETOOLONG); 3377 goto out; 3378 } 3379 err = dsl_dataset_snap_lookup(hds, ds->ds_snapname, &val); 3380 if (err == 0) { 3381 fnvlist_add_boolean(ddpa->err_ds, 3382 snap->ds->ds_snapname); 3383 conflicting_snaps = B_TRUE; 3384 } else if (err != ENOENT) { 3385 goto out; 3386 } 3387 3388 /* The very first snapshot does not have a deadlist */ 3389 if (dsl_dataset_phys(ds)->ds_prev_snap_obj == 0) 3390 continue; 3391 3392 dsl_deadlist_space(&ds->ds_deadlist, 3393 &dlused, &dlcomp, &dluncomp); 3394 ddpa->used += dlused; 3395 ddpa->comp += dlcomp; 3396 ddpa->uncomp += dluncomp; 3397 } 3398 3399 /* 3400 * Check that bookmarks that are being transferred don't have 3401 * name conflicts. 3402 */ 3403 for (dsl_bookmark_node_t *dbn = avl_first(&origin_ds->ds_bookmarks); 3404 dbn != NULL && dbn->dbn_phys.zbm_creation_txg <= 3405 dsl_dataset_phys(origin_ds)->ds_creation_txg; 3406 dbn = AVL_NEXT(&origin_ds->ds_bookmarks, dbn)) { 3407 if (strlen(dbn->dbn_name) >= max_snap_len) { 3408 err = SET_ERROR(ENAMETOOLONG); 3409 goto out; 3410 } 3411 zfs_bookmark_phys_t bm; 3412 err = dsl_bookmark_lookup_impl(ddpa->ddpa_clone, 3413 dbn->dbn_name, &bm); 3414 3415 if (err == 0) { 3416 fnvlist_add_boolean(ddpa->err_ds, dbn->dbn_name); 3417 conflicting_snaps = B_TRUE; 3418 } else if (err == ESRCH) { 3419 err = 0; 3420 } 3421 if (err != 0) { 3422 goto out; 3423 } 3424 } 3425 3426 /* 3427 * In order to return the full list of conflicting snapshots, we check 3428 * whether there was a conflict after traversing all of them. 3429 */ 3430 if (conflicting_snaps) { 3431 err = SET_ERROR(EEXIST); 3432 goto out; 3433 } 3434 3435 /* 3436 * If we are a clone of a clone then we never reached ORIGIN, 3437 * so we need to subtract out the clone origin's used space. 3438 */ 3439 if (ddpa->origin_origin) { 3440 ddpa->used -= 3441 dsl_dataset_phys(ddpa->origin_origin)->ds_referenced_bytes; 3442 ddpa->comp -= 3443 dsl_dataset_phys(ddpa->origin_origin)->ds_compressed_bytes; 3444 ddpa->uncomp -= 3445 dsl_dataset_phys(ddpa->origin_origin)-> 3446 ds_uncompressed_bytes; 3447 } 3448 3449 /* Check that there is enough space and limit headroom here */ 3450 err = dsl_dir_transfer_possible(origin_ds->ds_dir, hds->ds_dir, 3451 0, ss_mv_cnt, ddpa->used, ddpa->cr, ddpa->proc); 3452 if (err != 0) 3453 goto out; 3454 3455 /* 3456 * Compute the amounts of space that will be used by snapshots 3457 * after the promotion (for both origin and clone). For each, 3458 * it is the amount of space that will be on all of their 3459 * deadlists (that was not born before their new origin). 3460 */ 3461 if (dsl_dir_phys(hds->ds_dir)->dd_flags & DD_FLAG_USED_BREAKDOWN) { 3462 uint64_t space; 3463 3464 /* 3465 * Note, typically this will not be a clone of a clone, 3466 * so dd_origin_txg will be < TXG_INITIAL, so 3467 * these snaplist_space() -> dsl_deadlist_space_range() 3468 * calls will be fast because they do not have to 3469 * iterate over all bps. 3470 */ 3471 snap = list_head(&ddpa->origin_snaps); 3472 if (snap == NULL) { 3473 err = SET_ERROR(ENOENT); 3474 goto out; 3475 } 3476 err = snaplist_space(&ddpa->shared_snaps, 3477 snap->ds->ds_dir->dd_origin_txg, &ddpa->cloneusedsnap); 3478 if (err != 0) 3479 goto out; 3480 3481 err = snaplist_space(&ddpa->clone_snaps, 3482 snap->ds->ds_dir->dd_origin_txg, &space); 3483 if (err != 0) 3484 goto out; 3485 ddpa->cloneusedsnap += space; 3486 } 3487 if (dsl_dir_phys(origin_ds->ds_dir)->dd_flags & 3488 DD_FLAG_USED_BREAKDOWN) { 3489 err = snaplist_space(&ddpa->origin_snaps, 3490 dsl_dataset_phys(origin_ds)->ds_creation_txg, 3491 &ddpa->originusedsnap); 3492 if (err != 0) 3493 goto out; 3494 } 3495 3496 out: 3497 promote_rele(ddpa, FTAG); 3498 return (err); 3499 } 3500 3501 void 3502 dsl_dataset_promote_sync(void *arg, dmu_tx_t *tx) 3503 { 3504 dsl_dataset_promote_arg_t *ddpa = arg; 3505 dsl_pool_t *dp = dmu_tx_pool(tx); 3506 dsl_dataset_t *hds; 3507 struct promotenode *snap; 3508 dsl_dataset_t *origin_ds; 3509 dsl_dataset_t *origin_head; 3510 dsl_dir_t *dd; 3511 dsl_dir_t *odd = NULL; 3512 uint64_t oldnext_obj; 3513 int64_t delta; 3514 3515 ASSERT(nvlist_empty(ddpa->err_ds)); 3516 3517 VERIFY0(promote_hold(ddpa, dp, FTAG)); 3518 hds = ddpa->ddpa_clone; 3519 3520 ASSERT0(dsl_dataset_phys(hds)->ds_flags & DS_FLAG_NOPROMOTE); 3521 3522 snap = list_head(&ddpa->shared_snaps); 3523 origin_ds = snap->ds; 3524 dd = hds->ds_dir; 3525 3526 snap = list_head(&ddpa->origin_snaps); 3527 origin_head = snap->ds; 3528 3529 /* 3530 * We need to explicitly open odd, since origin_ds's dd will be 3531 * changing. 3532 */ 3533 VERIFY0(dsl_dir_hold_obj(dp, origin_ds->ds_dir->dd_object, 3534 NULL, FTAG, &odd)); 3535 3536 dsl_dataset_promote_crypt_sync(hds->ds_dir, odd, tx); 3537 3538 /* change origin's next snap */ 3539 dmu_buf_will_dirty(origin_ds->ds_dbuf, tx); 3540 oldnext_obj = dsl_dataset_phys(origin_ds)->ds_next_snap_obj; 3541 snap = list_tail(&ddpa->clone_snaps); 3542 ASSERT3U(dsl_dataset_phys(snap->ds)->ds_prev_snap_obj, ==, 3543 origin_ds->ds_object); 3544 dsl_dataset_phys(origin_ds)->ds_next_snap_obj = snap->ds->ds_object; 3545 3546 /* change the origin's next clone */ 3547 if (dsl_dataset_phys(origin_ds)->ds_next_clones_obj) { 3548 dsl_dataset_remove_from_next_clones(origin_ds, 3549 snap->ds->ds_object, tx); 3550 VERIFY0(zap_add_int(dp->dp_meta_objset, 3551 dsl_dataset_phys(origin_ds)->ds_next_clones_obj, 3552 oldnext_obj, tx)); 3553 } 3554 3555 /* change origin */ 3556 dmu_buf_will_dirty(dd->dd_dbuf, tx); 3557 ASSERT3U(dsl_dir_phys(dd)->dd_origin_obj, ==, origin_ds->ds_object); 3558 dsl_dir_phys(dd)->dd_origin_obj = dsl_dir_phys(odd)->dd_origin_obj; 3559 dd->dd_origin_txg = origin_head->ds_dir->dd_origin_txg; 3560 dmu_buf_will_dirty(odd->dd_dbuf, tx); 3561 dsl_dir_phys(odd)->dd_origin_obj = origin_ds->ds_object; 3562 origin_head->ds_dir->dd_origin_txg = 3563 dsl_dataset_phys(origin_ds)->ds_creation_txg; 3564 3565 /* change dd_clone entries */ 3566 if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 3567 VERIFY0(zap_remove_int(dp->dp_meta_objset, 3568 dsl_dir_phys(odd)->dd_clones, hds->ds_object, tx)); 3569 VERIFY0(zap_add_int(dp->dp_meta_objset, 3570 dsl_dir_phys(ddpa->origin_origin->ds_dir)->dd_clones, 3571 hds->ds_object, tx)); 3572 3573 VERIFY0(zap_remove_int(dp->dp_meta_objset, 3574 dsl_dir_phys(ddpa->origin_origin->ds_dir)->dd_clones, 3575 origin_head->ds_object, tx)); 3576 if (dsl_dir_phys(dd)->dd_clones == 0) { 3577 dsl_dir_phys(dd)->dd_clones = 3578 zap_create(dp->dp_meta_objset, DMU_OT_DSL_CLONES, 3579 DMU_OT_NONE, 0, tx); 3580 } 3581 VERIFY0(zap_add_int(dp->dp_meta_objset, 3582 dsl_dir_phys(dd)->dd_clones, origin_head->ds_object, tx)); 3583 } 3584 3585 /* 3586 * Move bookmarks to this dir. 3587 */ 3588 dsl_bookmark_node_t *dbn_next; 3589 for (dsl_bookmark_node_t *dbn = avl_first(&origin_head->ds_bookmarks); 3590 dbn != NULL && dbn->dbn_phys.zbm_creation_txg <= 3591 dsl_dataset_phys(origin_ds)->ds_creation_txg; 3592 dbn = dbn_next) { 3593 dbn_next = AVL_NEXT(&origin_head->ds_bookmarks, dbn); 3594 3595 avl_remove(&origin_head->ds_bookmarks, dbn); 3596 VERIFY0(zap_remove(dp->dp_meta_objset, 3597 origin_head->ds_bookmarks_obj, dbn->dbn_name, tx)); 3598 3599 dsl_bookmark_node_add(hds, dbn, tx); 3600 } 3601 3602 dsl_bookmark_next_changed(hds, origin_ds, tx); 3603 3604 /* move snapshots to this dir */ 3605 for (snap = list_head(&ddpa->shared_snaps); snap; 3606 snap = list_next(&ddpa->shared_snaps, snap)) { 3607 dsl_dataset_t *ds = snap->ds; 3608 3609 /* 3610 * Property callbacks are registered to a particular 3611 * dsl_dir. Since ours is changing, evict the objset 3612 * so that they will be unregistered from the old dsl_dir. 3613 */ 3614 if (ds->ds_objset) { 3615 dmu_objset_evict(ds->ds_objset); 3616 ds->ds_objset = NULL; 3617 } 3618 3619 /* move snap name entry */ 3620 VERIFY0(dsl_dataset_get_snapname(ds)); 3621 VERIFY0(dsl_dataset_snap_remove(origin_head, 3622 ds->ds_snapname, tx, B_TRUE)); 3623 VERIFY0(zap_add(dp->dp_meta_objset, 3624 dsl_dataset_phys(hds)->ds_snapnames_zapobj, ds->ds_snapname, 3625 8, 1, &ds->ds_object, tx)); 3626 dsl_fs_ss_count_adjust(hds->ds_dir, 1, 3627 DD_FIELD_SNAPSHOT_COUNT, tx); 3628 3629 /* change containing dsl_dir */ 3630 dmu_buf_will_dirty(ds->ds_dbuf, tx); 3631 ASSERT3U(dsl_dataset_phys(ds)->ds_dir_obj, ==, odd->dd_object); 3632 dsl_dataset_phys(ds)->ds_dir_obj = dd->dd_object; 3633 ASSERT3P(ds->ds_dir, ==, odd); 3634 dsl_dir_rele(ds->ds_dir, ds); 3635 VERIFY0(dsl_dir_hold_obj(dp, dd->dd_object, 3636 NULL, ds, &ds->ds_dir)); 3637 3638 /* move any clone references */ 3639 if (dsl_dataset_phys(ds)->ds_next_clones_obj && 3640 spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 3641 zap_cursor_t zc; 3642 zap_attribute_t za; 3643 3644 for (zap_cursor_init(&zc, dp->dp_meta_objset, 3645 dsl_dataset_phys(ds)->ds_next_clones_obj); 3646 zap_cursor_retrieve(&zc, &za) == 0; 3647 zap_cursor_advance(&zc)) { 3648 dsl_dataset_t *cnds; 3649 uint64_t o; 3650 3651 if (za.za_first_integer == oldnext_obj) { 3652 /* 3653 * We've already moved the 3654 * origin's reference. 3655 */ 3656 continue; 3657 } 3658 3659 VERIFY0(dsl_dataset_hold_obj(dp, 3660 za.za_first_integer, FTAG, &cnds)); 3661 o = dsl_dir_phys(cnds->ds_dir)-> 3662 dd_head_dataset_obj; 3663 3664 VERIFY0(zap_remove_int(dp->dp_meta_objset, 3665 dsl_dir_phys(odd)->dd_clones, o, tx)); 3666 VERIFY0(zap_add_int(dp->dp_meta_objset, 3667 dsl_dir_phys(dd)->dd_clones, o, tx)); 3668 dsl_dataset_rele(cnds, FTAG); 3669 } 3670 zap_cursor_fini(&zc); 3671 } 3672 3673 ASSERT(!dsl_prop_hascb(ds)); 3674 } 3675 3676 /* 3677 * Change space accounting. 3678 * Note, pa->*usedsnap and dd_used_breakdown[SNAP] will either 3679 * both be valid, or both be 0 (resulting in delta == 0). This 3680 * is true for each of {clone,origin} independently. 3681 */ 3682 3683 delta = ddpa->cloneusedsnap - 3684 dsl_dir_phys(dd)->dd_used_breakdown[DD_USED_SNAP]; 3685 ASSERT3S(delta, >=, 0); 3686 ASSERT3U(ddpa->used, >=, delta); 3687 dsl_dir_diduse_space(dd, DD_USED_SNAP, delta, 0, 0, tx); 3688 dsl_dir_diduse_space(dd, DD_USED_HEAD, 3689 ddpa->used - delta, ddpa->comp, ddpa->uncomp, tx); 3690 3691 delta = ddpa->originusedsnap - 3692 dsl_dir_phys(odd)->dd_used_breakdown[DD_USED_SNAP]; 3693 ASSERT3S(delta, <=, 0); 3694 ASSERT3U(ddpa->used, >=, -delta); 3695 dsl_dir_diduse_space(odd, DD_USED_SNAP, delta, 0, 0, tx); 3696 dsl_dir_diduse_space(odd, DD_USED_HEAD, 3697 -ddpa->used - delta, -ddpa->comp, -ddpa->uncomp, tx); 3698 3699 dsl_dataset_phys(origin_ds)->ds_unique_bytes = ddpa->unique; 3700 3701 /* 3702 * Since livelists are specific to a clone's origin txg, they 3703 * are no longer accurate. Destroy the livelist from the clone being 3704 * promoted. If the origin dataset is a clone, destroy its livelist 3705 * as well. 3706 */ 3707 dsl_dir_remove_livelist(dd, tx, B_TRUE); 3708 dsl_dir_remove_livelist(odd, tx, B_TRUE); 3709 3710 /* log history record */ 3711 spa_history_log_internal_ds(hds, "promote", tx, " "); 3712 3713 dsl_dir_rele(odd, FTAG); 3714 promote_rele(ddpa, FTAG); 3715 3716 /* 3717 * Transfer common error blocks from old head to new head. 3718 */ 3719 if (spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_HEAD_ERRLOG)) { 3720 uint64_t old_head = origin_head->ds_object; 3721 uint64_t new_head = hds->ds_object; 3722 spa_swap_errlog(dp->dp_spa, new_head, old_head, tx); 3723 } 3724 } 3725 3726 /* 3727 * Make a list of dsl_dataset_t's for the snapshots between first_obj 3728 * (exclusive) and last_obj (inclusive). The list will be in reverse 3729 * order (last_obj will be the list_head()). If first_obj == 0, do all 3730 * snapshots back to this dataset's origin. 3731 */ 3732 static int 3733 snaplist_make(dsl_pool_t *dp, 3734 uint64_t first_obj, uint64_t last_obj, list_t *l, const void *tag) 3735 { 3736 uint64_t obj = last_obj; 3737 3738 list_create(l, sizeof (struct promotenode), 3739 offsetof(struct promotenode, link)); 3740 3741 while (obj != first_obj) { 3742 dsl_dataset_t *ds; 3743 struct promotenode *snap; 3744 int err; 3745 3746 err = dsl_dataset_hold_obj(dp, obj, tag, &ds); 3747 ASSERT(err != ENOENT); 3748 if (err != 0) 3749 return (err); 3750 3751 if (first_obj == 0) 3752 first_obj = dsl_dir_phys(ds->ds_dir)->dd_origin_obj; 3753 3754 snap = kmem_alloc(sizeof (*snap), KM_SLEEP); 3755 snap->ds = ds; 3756 list_insert_tail(l, snap); 3757 obj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 3758 } 3759 3760 return (0); 3761 } 3762 3763 static int 3764 snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep) 3765 { 3766 struct promotenode *snap; 3767 3768 *spacep = 0; 3769 for (snap = list_head(l); snap; snap = list_next(l, snap)) { 3770 uint64_t used, comp, uncomp; 3771 dsl_deadlist_space_range(&snap->ds->ds_deadlist, 3772 mintxg, UINT64_MAX, &used, &comp, &uncomp); 3773 *spacep += used; 3774 } 3775 return (0); 3776 } 3777 3778 static void 3779 snaplist_destroy(list_t *l, const void *tag) 3780 { 3781 struct promotenode *snap; 3782 3783 if (l == NULL || !list_link_active(&l->list_head)) 3784 return; 3785 3786 while ((snap = list_remove_tail(l)) != NULL) { 3787 dsl_dataset_rele(snap->ds, tag); 3788 kmem_free(snap, sizeof (*snap)); 3789 } 3790 list_destroy(l); 3791 } 3792 3793 static int 3794 promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp, const void *tag) 3795 { 3796 int error; 3797 dsl_dir_t *dd; 3798 struct promotenode *snap; 3799 3800 error = dsl_dataset_hold(dp, ddpa->ddpa_clonename, tag, 3801 &ddpa->ddpa_clone); 3802 if (error != 0) 3803 return (error); 3804 dd = ddpa->ddpa_clone->ds_dir; 3805 3806 if (ddpa->ddpa_clone->ds_is_snapshot || 3807 !dsl_dir_is_clone(dd)) { 3808 dsl_dataset_rele(ddpa->ddpa_clone, tag); 3809 return (SET_ERROR(EINVAL)); 3810 } 3811 3812 error = snaplist_make(dp, 0, dsl_dir_phys(dd)->dd_origin_obj, 3813 &ddpa->shared_snaps, tag); 3814 if (error != 0) 3815 goto out; 3816 3817 error = snaplist_make(dp, 0, ddpa->ddpa_clone->ds_object, 3818 &ddpa->clone_snaps, tag); 3819 if (error != 0) 3820 goto out; 3821 3822 snap = list_head(&ddpa->shared_snaps); 3823 ASSERT3U(snap->ds->ds_object, ==, dsl_dir_phys(dd)->dd_origin_obj); 3824 error = snaplist_make(dp, dsl_dir_phys(dd)->dd_origin_obj, 3825 dsl_dir_phys(snap->ds->ds_dir)->dd_head_dataset_obj, 3826 &ddpa->origin_snaps, tag); 3827 if (error != 0) 3828 goto out; 3829 3830 if (dsl_dir_phys(snap->ds->ds_dir)->dd_origin_obj != 0) { 3831 error = dsl_dataset_hold_obj(dp, 3832 dsl_dir_phys(snap->ds->ds_dir)->dd_origin_obj, 3833 tag, &ddpa->origin_origin); 3834 if (error != 0) 3835 goto out; 3836 } 3837 out: 3838 if (error != 0) 3839 promote_rele(ddpa, tag); 3840 return (error); 3841 } 3842 3843 static void 3844 promote_rele(dsl_dataset_promote_arg_t *ddpa, const void *tag) 3845 { 3846 snaplist_destroy(&ddpa->shared_snaps, tag); 3847 snaplist_destroy(&ddpa->clone_snaps, tag); 3848 snaplist_destroy(&ddpa->origin_snaps, tag); 3849 if (ddpa->origin_origin != NULL) 3850 dsl_dataset_rele(ddpa->origin_origin, tag); 3851 dsl_dataset_rele(ddpa->ddpa_clone, tag); 3852 } 3853 3854 /* 3855 * Promote a clone. 3856 * 3857 * If it fails due to a conflicting snapshot name, "conflsnap" will be filled 3858 * in with the name. (It must be at least ZFS_MAX_DATASET_NAME_LEN bytes long.) 3859 */ 3860 int 3861 dsl_dataset_promote(const char *name, char *conflsnap) 3862 { 3863 dsl_dataset_promote_arg_t ddpa = { 0 }; 3864 uint64_t numsnaps; 3865 int error; 3866 nvpair_t *snap_pair; 3867 objset_t *os; 3868 3869 /* 3870 * We will modify space proportional to the number of 3871 * snapshots. Compute numsnaps. 3872 */ 3873 error = dmu_objset_hold(name, FTAG, &os); 3874 if (error != 0) 3875 return (error); 3876 error = zap_count(dmu_objset_pool(os)->dp_meta_objset, 3877 dsl_dataset_phys(dmu_objset_ds(os))->ds_snapnames_zapobj, 3878 &numsnaps); 3879 dmu_objset_rele(os, FTAG); 3880 if (error != 0) 3881 return (error); 3882 3883 ddpa.ddpa_clonename = name; 3884 ddpa.err_ds = fnvlist_alloc(); 3885 ddpa.cr = CRED(); 3886 ddpa.proc = curproc; 3887 3888 error = dsl_sync_task(name, dsl_dataset_promote_check, 3889 dsl_dataset_promote_sync, &ddpa, 3890 2 + numsnaps, ZFS_SPACE_CHECK_RESERVED); 3891 3892 /* 3893 * Return the first conflicting snapshot found. 3894 */ 3895 snap_pair = nvlist_next_nvpair(ddpa.err_ds, NULL); 3896 if (snap_pair != NULL && conflsnap != NULL) 3897 (void) strlcpy(conflsnap, nvpair_name(snap_pair), 3898 ZFS_MAX_DATASET_NAME_LEN); 3899 3900 fnvlist_free(ddpa.err_ds); 3901 return (error); 3902 } 3903 3904 int 3905 dsl_dataset_clone_swap_check_impl(dsl_dataset_t *clone, 3906 dsl_dataset_t *origin_head, boolean_t force, void *owner, dmu_tx_t *tx) 3907 { 3908 /* 3909 * "slack" factor for received datasets with refquota set on them. 3910 * See the bottom of this function for details on its use. 3911 */ 3912 uint64_t refquota_slack = (uint64_t)DMU_MAX_ACCESS * 3913 spa_asize_inflation; 3914 int64_t unused_refres_delta; 3915 3916 /* they should both be heads */ 3917 if (clone->ds_is_snapshot || 3918 origin_head->ds_is_snapshot) 3919 return (SET_ERROR(EINVAL)); 3920 3921 /* if we are not forcing, the branch point should be just before them */ 3922 if (!force && clone->ds_prev != origin_head->ds_prev) 3923 return (SET_ERROR(EINVAL)); 3924 3925 /* clone should be the clone (unless they are unrelated) */ 3926 if (clone->ds_prev != NULL && 3927 clone->ds_prev != clone->ds_dir->dd_pool->dp_origin_snap && 3928 origin_head->ds_dir != clone->ds_prev->ds_dir) 3929 return (SET_ERROR(EINVAL)); 3930 3931 /* the clone should be a child of the origin */ 3932 if (clone->ds_dir->dd_parent != origin_head->ds_dir) 3933 return (SET_ERROR(EINVAL)); 3934 3935 /* origin_head shouldn't be modified unless 'force' */ 3936 if (!force && 3937 dsl_dataset_modified_since_snap(origin_head, origin_head->ds_prev)) 3938 return (SET_ERROR(ETXTBSY)); 3939 3940 /* origin_head should have no long holds (e.g. is not mounted) */ 3941 if (dsl_dataset_handoff_check(origin_head, owner, tx)) 3942 return (SET_ERROR(EBUSY)); 3943 3944 /* check amount of any unconsumed refreservation */ 3945 unused_refres_delta = 3946 (int64_t)MIN(origin_head->ds_reserved, 3947 dsl_dataset_phys(origin_head)->ds_unique_bytes) - 3948 (int64_t)MIN(origin_head->ds_reserved, 3949 dsl_dataset_phys(clone)->ds_unique_bytes); 3950 3951 if (unused_refres_delta > 0 && 3952 unused_refres_delta > 3953 dsl_dir_space_available(origin_head->ds_dir, NULL, 0, TRUE)) 3954 return (SET_ERROR(ENOSPC)); 3955 3956 /* 3957 * The clone can't be too much over the head's refquota. 3958 * 3959 * To ensure that the entire refquota can be used, we allow one 3960 * transaction to exceed the refquota. Therefore, this check 3961 * needs to also allow for the space referenced to be more than the 3962 * refquota. The maximum amount of space that one transaction can use 3963 * on disk is DMU_MAX_ACCESS * spa_asize_inflation. Allowing this 3964 * overage ensures that we are able to receive a filesystem that 3965 * exceeds the refquota on the source system. 3966 * 3967 * So that overage is the refquota_slack we use below. 3968 */ 3969 if (origin_head->ds_quota != 0 && 3970 dsl_dataset_phys(clone)->ds_referenced_bytes > 3971 origin_head->ds_quota + refquota_slack) 3972 return (SET_ERROR(EDQUOT)); 3973 3974 return (0); 3975 } 3976 3977 static void 3978 dsl_dataset_swap_remap_deadlists(dsl_dataset_t *clone, 3979 dsl_dataset_t *origin, dmu_tx_t *tx) 3980 { 3981 uint64_t clone_remap_dl_obj, origin_remap_dl_obj; 3982 dsl_pool_t *dp = dmu_tx_pool(tx); 3983 3984 ASSERT(dsl_pool_sync_context(dp)); 3985 3986 clone_remap_dl_obj = dsl_dataset_get_remap_deadlist_object(clone); 3987 origin_remap_dl_obj = dsl_dataset_get_remap_deadlist_object(origin); 3988 3989 if (clone_remap_dl_obj != 0) { 3990 dsl_deadlist_close(&clone->ds_remap_deadlist); 3991 dsl_dataset_unset_remap_deadlist_object(clone, tx); 3992 } 3993 if (origin_remap_dl_obj != 0) { 3994 dsl_deadlist_close(&origin->ds_remap_deadlist); 3995 dsl_dataset_unset_remap_deadlist_object(origin, tx); 3996 } 3997 3998 if (clone_remap_dl_obj != 0) { 3999 dsl_dataset_set_remap_deadlist_object(origin, 4000 clone_remap_dl_obj, tx); 4001 dsl_deadlist_open(&origin->ds_remap_deadlist, 4002 dp->dp_meta_objset, clone_remap_dl_obj); 4003 } 4004 if (origin_remap_dl_obj != 0) { 4005 dsl_dataset_set_remap_deadlist_object(clone, 4006 origin_remap_dl_obj, tx); 4007 dsl_deadlist_open(&clone->ds_remap_deadlist, 4008 dp->dp_meta_objset, origin_remap_dl_obj); 4009 } 4010 } 4011 4012 void 4013 dsl_dataset_clone_swap_sync_impl(dsl_dataset_t *clone, 4014 dsl_dataset_t *origin_head, dmu_tx_t *tx) 4015 { 4016 dsl_pool_t *dp = dmu_tx_pool(tx); 4017 int64_t unused_refres_delta; 4018 4019 ASSERT(clone->ds_reserved == 0); 4020 /* 4021 * NOTE: On DEBUG kernels there could be a race between this and 4022 * the check function if spa_asize_inflation is adjusted... 4023 */ 4024 ASSERT(origin_head->ds_quota == 0 || 4025 dsl_dataset_phys(clone)->ds_unique_bytes <= origin_head->ds_quota + 4026 DMU_MAX_ACCESS * spa_asize_inflation); 4027 ASSERT3P(clone->ds_prev, ==, origin_head->ds_prev); 4028 4029 dsl_dir_cancel_waiters(origin_head->ds_dir); 4030 4031 /* 4032 * Swap per-dataset feature flags. 4033 */ 4034 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 4035 if (!(spa_feature_table[f].fi_flags & 4036 ZFEATURE_FLAG_PER_DATASET)) { 4037 ASSERT(!dsl_dataset_feature_is_active(clone, f)); 4038 ASSERT(!dsl_dataset_feature_is_active(origin_head, f)); 4039 continue; 4040 } 4041 4042 boolean_t clone_inuse = dsl_dataset_feature_is_active(clone, f); 4043 void *clone_feature = clone->ds_feature[f]; 4044 boolean_t origin_head_inuse = 4045 dsl_dataset_feature_is_active(origin_head, f); 4046 void *origin_head_feature = origin_head->ds_feature[f]; 4047 4048 if (clone_inuse) 4049 dsl_dataset_deactivate_feature_impl(clone, f, tx); 4050 if (origin_head_inuse) 4051 dsl_dataset_deactivate_feature_impl(origin_head, f, tx); 4052 4053 if (clone_inuse) { 4054 dsl_dataset_activate_feature(origin_head->ds_object, f, 4055 clone_feature, tx); 4056 origin_head->ds_feature[f] = clone_feature; 4057 } 4058 if (origin_head_inuse) { 4059 dsl_dataset_activate_feature(clone->ds_object, f, 4060 origin_head_feature, tx); 4061 clone->ds_feature[f] = origin_head_feature; 4062 } 4063 } 4064 4065 dmu_buf_will_dirty(clone->ds_dbuf, tx); 4066 dmu_buf_will_dirty(origin_head->ds_dbuf, tx); 4067 4068 if (clone->ds_objset != NULL) { 4069 dmu_objset_evict(clone->ds_objset); 4070 clone->ds_objset = NULL; 4071 } 4072 4073 if (origin_head->ds_objset != NULL) { 4074 dmu_objset_evict(origin_head->ds_objset); 4075 origin_head->ds_objset = NULL; 4076 } 4077 4078 unused_refres_delta = 4079 (int64_t)MIN(origin_head->ds_reserved, 4080 dsl_dataset_phys(origin_head)->ds_unique_bytes) - 4081 (int64_t)MIN(origin_head->ds_reserved, 4082 dsl_dataset_phys(clone)->ds_unique_bytes); 4083 4084 /* 4085 * Reset origin's unique bytes. 4086 */ 4087 { 4088 dsl_dataset_t *origin = clone->ds_prev; 4089 uint64_t comp, uncomp; 4090 4091 dmu_buf_will_dirty(origin->ds_dbuf, tx); 4092 dsl_deadlist_space_range(&clone->ds_deadlist, 4093 dsl_dataset_phys(origin)->ds_prev_snap_txg, UINT64_MAX, 4094 &dsl_dataset_phys(origin)->ds_unique_bytes, &comp, &uncomp); 4095 } 4096 4097 /* swap blkptrs */ 4098 { 4099 rrw_enter(&clone->ds_bp_rwlock, RW_WRITER, FTAG); 4100 rrw_enter(&origin_head->ds_bp_rwlock, RW_WRITER, FTAG); 4101 blkptr_t tmp; 4102 tmp = dsl_dataset_phys(origin_head)->ds_bp; 4103 dsl_dataset_phys(origin_head)->ds_bp = 4104 dsl_dataset_phys(clone)->ds_bp; 4105 dsl_dataset_phys(clone)->ds_bp = tmp; 4106 rrw_exit(&origin_head->ds_bp_rwlock, FTAG); 4107 rrw_exit(&clone->ds_bp_rwlock, FTAG); 4108 } 4109 4110 /* set dd_*_bytes */ 4111 { 4112 int64_t dused, dcomp, duncomp; 4113 uint64_t cdl_used, cdl_comp, cdl_uncomp; 4114 uint64_t odl_used, odl_comp, odl_uncomp; 4115 4116 ASSERT3U(dsl_dir_phys(clone->ds_dir)-> 4117 dd_used_breakdown[DD_USED_SNAP], ==, 0); 4118 4119 dsl_deadlist_space(&clone->ds_deadlist, 4120 &cdl_used, &cdl_comp, &cdl_uncomp); 4121 dsl_deadlist_space(&origin_head->ds_deadlist, 4122 &odl_used, &odl_comp, &odl_uncomp); 4123 4124 dused = dsl_dataset_phys(clone)->ds_referenced_bytes + 4125 cdl_used - 4126 (dsl_dataset_phys(origin_head)->ds_referenced_bytes + 4127 odl_used); 4128 dcomp = dsl_dataset_phys(clone)->ds_compressed_bytes + 4129 cdl_comp - 4130 (dsl_dataset_phys(origin_head)->ds_compressed_bytes + 4131 odl_comp); 4132 duncomp = dsl_dataset_phys(clone)->ds_uncompressed_bytes + 4133 cdl_uncomp - 4134 (dsl_dataset_phys(origin_head)->ds_uncompressed_bytes + 4135 odl_uncomp); 4136 4137 dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_HEAD, 4138 dused, dcomp, duncomp, tx); 4139 dsl_dir_diduse_space(clone->ds_dir, DD_USED_HEAD, 4140 -dused, -dcomp, -duncomp, tx); 4141 4142 /* 4143 * The difference in the space used by snapshots is the 4144 * difference in snapshot space due to the head's 4145 * deadlist (since that's the only thing that's 4146 * changing that affects the snapused). 4147 */ 4148 dsl_deadlist_space_range(&clone->ds_deadlist, 4149 origin_head->ds_dir->dd_origin_txg, UINT64_MAX, 4150 &cdl_used, &cdl_comp, &cdl_uncomp); 4151 dsl_deadlist_space_range(&origin_head->ds_deadlist, 4152 origin_head->ds_dir->dd_origin_txg, UINT64_MAX, 4153 &odl_used, &odl_comp, &odl_uncomp); 4154 dsl_dir_transfer_space(origin_head->ds_dir, cdl_used - odl_used, 4155 DD_USED_HEAD, DD_USED_SNAP, tx); 4156 } 4157 4158 /* swap ds_*_bytes */ 4159 SWITCH64(dsl_dataset_phys(origin_head)->ds_referenced_bytes, 4160 dsl_dataset_phys(clone)->ds_referenced_bytes); 4161 SWITCH64(dsl_dataset_phys(origin_head)->ds_compressed_bytes, 4162 dsl_dataset_phys(clone)->ds_compressed_bytes); 4163 SWITCH64(dsl_dataset_phys(origin_head)->ds_uncompressed_bytes, 4164 dsl_dataset_phys(clone)->ds_uncompressed_bytes); 4165 SWITCH64(dsl_dataset_phys(origin_head)->ds_unique_bytes, 4166 dsl_dataset_phys(clone)->ds_unique_bytes); 4167 4168 /* apply any parent delta for change in unconsumed refreservation */ 4169 dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_REFRSRV, 4170 unused_refres_delta, 0, 0, tx); 4171 4172 /* 4173 * Swap deadlists. 4174 */ 4175 dsl_deadlist_close(&clone->ds_deadlist); 4176 dsl_deadlist_close(&origin_head->ds_deadlist); 4177 SWITCH64(dsl_dataset_phys(origin_head)->ds_deadlist_obj, 4178 dsl_dataset_phys(clone)->ds_deadlist_obj); 4179 dsl_deadlist_open(&clone->ds_deadlist, dp->dp_meta_objset, 4180 dsl_dataset_phys(clone)->ds_deadlist_obj); 4181 dsl_deadlist_open(&origin_head->ds_deadlist, dp->dp_meta_objset, 4182 dsl_dataset_phys(origin_head)->ds_deadlist_obj); 4183 dsl_dataset_swap_remap_deadlists(clone, origin_head, tx); 4184 4185 /* 4186 * If there is a bookmark at the origin, its "next dataset" is 4187 * changing, so we need to reset its FBN. 4188 */ 4189 dsl_bookmark_next_changed(origin_head, origin_head->ds_prev, tx); 4190 4191 dsl_scan_ds_clone_swapped(origin_head, clone, tx); 4192 4193 /* 4194 * Destroy any livelists associated with the clone or the origin, 4195 * since after the swap the corresponding livelists are no longer 4196 * valid. 4197 */ 4198 dsl_dir_remove_livelist(clone->ds_dir, tx, B_TRUE); 4199 dsl_dir_remove_livelist(origin_head->ds_dir, tx, B_TRUE); 4200 4201 spa_history_log_internal_ds(clone, "clone swap", tx, 4202 "parent=%s", origin_head->ds_dir->dd_myname); 4203 } 4204 4205 /* 4206 * Given a pool name and a dataset object number in that pool, 4207 * return the name of that dataset. 4208 */ 4209 int 4210 dsl_dsobj_to_dsname(char *pname, uint64_t obj, char *buf) 4211 { 4212 dsl_pool_t *dp; 4213 dsl_dataset_t *ds; 4214 int error; 4215 4216 error = dsl_pool_hold(pname, FTAG, &dp); 4217 if (error != 0) 4218 return (error); 4219 4220 error = dsl_dataset_hold_obj(dp, obj, FTAG, &ds); 4221 if (error == 0) { 4222 dsl_dataset_name(ds, buf); 4223 dsl_dataset_rele(ds, FTAG); 4224 } 4225 dsl_pool_rele(dp, FTAG); 4226 4227 return (error); 4228 } 4229 4230 int 4231 dsl_dataset_check_quota(dsl_dataset_t *ds, boolean_t check_quota, 4232 uint64_t asize, uint64_t inflight, uint64_t *used, uint64_t *ref_rsrv) 4233 { 4234 int error = 0; 4235 4236 ASSERT3S(asize, >, 0); 4237 4238 /* 4239 * *ref_rsrv is the portion of asize that will come from any 4240 * unconsumed refreservation space. 4241 */ 4242 *ref_rsrv = 0; 4243 4244 mutex_enter(&ds->ds_lock); 4245 /* 4246 * Make a space adjustment for reserved bytes. 4247 */ 4248 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes) { 4249 ASSERT3U(*used, >=, 4250 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes); 4251 *used -= 4252 (ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes); 4253 *ref_rsrv = 4254 asize - MIN(asize, parent_delta(ds, asize + inflight)); 4255 } 4256 4257 if (!check_quota || ds->ds_quota == 0) { 4258 mutex_exit(&ds->ds_lock); 4259 return (0); 4260 } 4261 /* 4262 * If they are requesting more space, and our current estimate 4263 * is over quota, they get to try again unless the actual 4264 * on-disk is over quota and there are no pending changes (which 4265 * may free up space for us). 4266 */ 4267 if (dsl_dataset_phys(ds)->ds_referenced_bytes + inflight >= 4268 ds->ds_quota) { 4269 if (inflight > 0 || 4270 dsl_dataset_phys(ds)->ds_referenced_bytes < ds->ds_quota) 4271 error = SET_ERROR(ERESTART); 4272 else 4273 error = SET_ERROR(EDQUOT); 4274 } 4275 mutex_exit(&ds->ds_lock); 4276 4277 return (error); 4278 } 4279 4280 typedef struct dsl_dataset_set_qr_arg { 4281 const char *ddsqra_name; 4282 zprop_source_t ddsqra_source; 4283 uint64_t ddsqra_value; 4284 } dsl_dataset_set_qr_arg_t; 4285 4286 4287 static int 4288 dsl_dataset_set_refquota_check(void *arg, dmu_tx_t *tx) 4289 { 4290 dsl_dataset_set_qr_arg_t *ddsqra = arg; 4291 dsl_pool_t *dp = dmu_tx_pool(tx); 4292 dsl_dataset_t *ds; 4293 int error; 4294 uint64_t newval; 4295 4296 if (spa_version(dp->dp_spa) < SPA_VERSION_REFQUOTA) 4297 return (SET_ERROR(ENOTSUP)); 4298 4299 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds); 4300 if (error != 0) 4301 return (error); 4302 4303 if (ds->ds_is_snapshot) { 4304 dsl_dataset_rele(ds, FTAG); 4305 return (SET_ERROR(EINVAL)); 4306 } 4307 4308 error = dsl_prop_predict(ds->ds_dir, 4309 zfs_prop_to_name(ZFS_PROP_REFQUOTA), 4310 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval); 4311 if (error != 0) { 4312 dsl_dataset_rele(ds, FTAG); 4313 return (error); 4314 } 4315 4316 if (newval == 0) { 4317 dsl_dataset_rele(ds, FTAG); 4318 return (0); 4319 } 4320 4321 if (newval < dsl_dataset_phys(ds)->ds_referenced_bytes || 4322 newval < ds->ds_reserved) { 4323 dsl_dataset_rele(ds, FTAG); 4324 return (SET_ERROR(ENOSPC)); 4325 } 4326 4327 dsl_dataset_rele(ds, FTAG); 4328 return (0); 4329 } 4330 4331 static void 4332 dsl_dataset_set_refquota_sync(void *arg, dmu_tx_t *tx) 4333 { 4334 dsl_dataset_set_qr_arg_t *ddsqra = arg; 4335 dsl_pool_t *dp = dmu_tx_pool(tx); 4336 dsl_dataset_t *ds = NULL; 4337 uint64_t newval; 4338 4339 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds)); 4340 4341 dsl_prop_set_sync_impl(ds, 4342 zfs_prop_to_name(ZFS_PROP_REFQUOTA), 4343 ddsqra->ddsqra_source, sizeof (ddsqra->ddsqra_value), 1, 4344 &ddsqra->ddsqra_value, tx); 4345 4346 VERIFY0(dsl_prop_get_int_ds(ds, 4347 zfs_prop_to_name(ZFS_PROP_REFQUOTA), &newval)); 4348 4349 if (ds->ds_quota != newval) { 4350 dmu_buf_will_dirty(ds->ds_dbuf, tx); 4351 ds->ds_quota = newval; 4352 } 4353 dsl_dataset_rele(ds, FTAG); 4354 } 4355 4356 int 4357 dsl_dataset_set_refquota(const char *dsname, zprop_source_t source, 4358 uint64_t refquota) 4359 { 4360 dsl_dataset_set_qr_arg_t ddsqra; 4361 4362 ddsqra.ddsqra_name = dsname; 4363 ddsqra.ddsqra_source = source; 4364 ddsqra.ddsqra_value = refquota; 4365 4366 return (dsl_sync_task(dsname, dsl_dataset_set_refquota_check, 4367 dsl_dataset_set_refquota_sync, &ddsqra, 0, 4368 ZFS_SPACE_CHECK_EXTRA_RESERVED)); 4369 } 4370 4371 static int 4372 dsl_dataset_set_refreservation_check(void *arg, dmu_tx_t *tx) 4373 { 4374 dsl_dataset_set_qr_arg_t *ddsqra = arg; 4375 dsl_pool_t *dp = dmu_tx_pool(tx); 4376 dsl_dataset_t *ds; 4377 int error; 4378 uint64_t newval, unique; 4379 4380 if (spa_version(dp->dp_spa) < SPA_VERSION_REFRESERVATION) 4381 return (SET_ERROR(ENOTSUP)); 4382 4383 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds); 4384 if (error != 0) 4385 return (error); 4386 4387 if (ds->ds_is_snapshot) { 4388 dsl_dataset_rele(ds, FTAG); 4389 return (SET_ERROR(EINVAL)); 4390 } 4391 4392 error = dsl_prop_predict(ds->ds_dir, 4393 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 4394 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval); 4395 if (error != 0) { 4396 dsl_dataset_rele(ds, FTAG); 4397 return (error); 4398 } 4399 4400 /* 4401 * If we are doing the preliminary check in open context, the 4402 * space estimates may be inaccurate. 4403 */ 4404 if (!dmu_tx_is_syncing(tx)) { 4405 dsl_dataset_rele(ds, FTAG); 4406 return (0); 4407 } 4408 4409 mutex_enter(&ds->ds_lock); 4410 if (!DS_UNIQUE_IS_ACCURATE(ds)) 4411 dsl_dataset_recalc_head_uniq(ds); 4412 unique = dsl_dataset_phys(ds)->ds_unique_bytes; 4413 mutex_exit(&ds->ds_lock); 4414 4415 if (MAX(unique, newval) > MAX(unique, ds->ds_reserved)) { 4416 uint64_t delta = MAX(unique, newval) - 4417 MAX(unique, ds->ds_reserved); 4418 4419 if (delta > 4420 dsl_dir_space_available(ds->ds_dir, NULL, 0, B_TRUE) || 4421 (ds->ds_quota > 0 && newval > ds->ds_quota)) { 4422 dsl_dataset_rele(ds, FTAG); 4423 return (SET_ERROR(ENOSPC)); 4424 } 4425 } 4426 4427 dsl_dataset_rele(ds, FTAG); 4428 return (0); 4429 } 4430 4431 void 4432 dsl_dataset_set_refreservation_sync_impl(dsl_dataset_t *ds, 4433 zprop_source_t source, uint64_t value, dmu_tx_t *tx) 4434 { 4435 uint64_t newval; 4436 uint64_t unique; 4437 int64_t delta; 4438 4439 dsl_prop_set_sync_impl(ds, zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 4440 source, sizeof (value), 1, &value, tx); 4441 4442 VERIFY0(dsl_prop_get_int_ds(ds, 4443 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), &newval)); 4444 4445 dmu_buf_will_dirty(ds->ds_dbuf, tx); 4446 mutex_enter(&ds->ds_dir->dd_lock); 4447 mutex_enter(&ds->ds_lock); 4448 ASSERT(DS_UNIQUE_IS_ACCURATE(ds)); 4449 unique = dsl_dataset_phys(ds)->ds_unique_bytes; 4450 delta = MAX(0, (int64_t)(newval - unique)) - 4451 MAX(0, (int64_t)(ds->ds_reserved - unique)); 4452 ds->ds_reserved = newval; 4453 mutex_exit(&ds->ds_lock); 4454 4455 dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV, delta, 0, 0, tx); 4456 mutex_exit(&ds->ds_dir->dd_lock); 4457 } 4458 4459 static void 4460 dsl_dataset_set_refreservation_sync(void *arg, dmu_tx_t *tx) 4461 { 4462 dsl_dataset_set_qr_arg_t *ddsqra = arg; 4463 dsl_pool_t *dp = dmu_tx_pool(tx); 4464 dsl_dataset_t *ds = NULL; 4465 4466 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds)); 4467 dsl_dataset_set_refreservation_sync_impl(ds, 4468 ddsqra->ddsqra_source, ddsqra->ddsqra_value, tx); 4469 dsl_dataset_rele(ds, FTAG); 4470 } 4471 4472 int 4473 dsl_dataset_set_refreservation(const char *dsname, zprop_source_t source, 4474 uint64_t refreservation) 4475 { 4476 dsl_dataset_set_qr_arg_t ddsqra; 4477 4478 ddsqra.ddsqra_name = dsname; 4479 ddsqra.ddsqra_source = source; 4480 ddsqra.ddsqra_value = refreservation; 4481 4482 return (dsl_sync_task(dsname, dsl_dataset_set_refreservation_check, 4483 dsl_dataset_set_refreservation_sync, &ddsqra, 0, 4484 ZFS_SPACE_CHECK_EXTRA_RESERVED)); 4485 } 4486 4487 typedef struct dsl_dataset_set_compression_arg { 4488 const char *ddsca_name; 4489 zprop_source_t ddsca_source; 4490 uint64_t ddsca_value; 4491 } dsl_dataset_set_compression_arg_t; 4492 4493 static int 4494 dsl_dataset_set_compression_check(void *arg, dmu_tx_t *tx) 4495 { 4496 dsl_dataset_set_compression_arg_t *ddsca = arg; 4497 dsl_pool_t *dp = dmu_tx_pool(tx); 4498 4499 uint64_t compval = ZIO_COMPRESS_ALGO(ddsca->ddsca_value); 4500 spa_feature_t f = zio_compress_to_feature(compval); 4501 4502 if (f == SPA_FEATURE_NONE) 4503 return (SET_ERROR(EINVAL)); 4504 4505 if (!spa_feature_is_enabled(dp->dp_spa, f)) 4506 return (SET_ERROR(ENOTSUP)); 4507 4508 return (0); 4509 } 4510 4511 static void 4512 dsl_dataset_set_compression_sync(void *arg, dmu_tx_t *tx) 4513 { 4514 dsl_dataset_set_compression_arg_t *ddsca = arg; 4515 dsl_pool_t *dp = dmu_tx_pool(tx); 4516 dsl_dataset_t *ds = NULL; 4517 4518 uint64_t compval = ZIO_COMPRESS_ALGO(ddsca->ddsca_value); 4519 spa_feature_t f = zio_compress_to_feature(compval); 4520 ASSERT3S(f, !=, SPA_FEATURE_NONE); 4521 ASSERT3S(spa_feature_table[f].fi_type, ==, ZFEATURE_TYPE_BOOLEAN); 4522 4523 VERIFY0(dsl_dataset_hold(dp, ddsca->ddsca_name, FTAG, &ds)); 4524 if (zfeature_active(f, ds->ds_feature[f]) != B_TRUE) { 4525 ds->ds_feature_activation[f] = (void *)B_TRUE; 4526 dsl_dataset_activate_feature(ds->ds_object, f, 4527 ds->ds_feature_activation[f], tx); 4528 ds->ds_feature[f] = ds->ds_feature_activation[f]; 4529 } 4530 dsl_dataset_rele(ds, FTAG); 4531 } 4532 4533 int 4534 dsl_dataset_set_compression(const char *dsname, zprop_source_t source, 4535 uint64_t compression) 4536 { 4537 dsl_dataset_set_compression_arg_t ddsca; 4538 4539 /* 4540 * The sync task is only required for zstd in order to activate 4541 * the feature flag when the property is first set. 4542 */ 4543 if (ZIO_COMPRESS_ALGO(compression) != ZIO_COMPRESS_ZSTD) 4544 return (0); 4545 4546 ddsca.ddsca_name = dsname; 4547 ddsca.ddsca_source = source; 4548 ddsca.ddsca_value = compression; 4549 4550 return (dsl_sync_task(dsname, dsl_dataset_set_compression_check, 4551 dsl_dataset_set_compression_sync, &ddsca, 0, 4552 ZFS_SPACE_CHECK_EXTRA_RESERVED)); 4553 } 4554 4555 /* 4556 * Return (in *usedp) the amount of space referenced by "new" that was not 4557 * referenced at the time the bookmark corresponds to. "New" may be a 4558 * snapshot or a head. The bookmark must be before new, in 4559 * new's filesystem (or its origin) -- caller verifies this. 4560 * 4561 * The written space is calculated by considering two components: First, we 4562 * ignore any freed space, and calculate the written as new's used space 4563 * minus old's used space. Next, we add in the amount of space that was freed 4564 * between the two time points, thus reducing new's used space relative to 4565 * old's. Specifically, this is the space that was born before 4566 * zbm_creation_txg, and freed before new (ie. on new's deadlist or a 4567 * previous deadlist). 4568 * 4569 * space freed [---------------------] 4570 * snapshots ---O-------O--------O-------O------ 4571 * bookmark new 4572 * 4573 * Note, the bookmark's zbm_*_bytes_refd must be valid, but if the HAS_FBN 4574 * flag is not set, we will calculate the freed_before_next based on the 4575 * next snapshot's deadlist, rather than using zbm_*_freed_before_next_snap. 4576 */ 4577 static int 4578 dsl_dataset_space_written_impl(zfs_bookmark_phys_t *bmp, 4579 dsl_dataset_t *new, uint64_t *usedp, uint64_t *compp, uint64_t *uncompp) 4580 { 4581 int err = 0; 4582 dsl_pool_t *dp = new->ds_dir->dd_pool; 4583 4584 ASSERT(dsl_pool_config_held(dp)); 4585 if (dsl_dataset_is_snapshot(new)) { 4586 ASSERT3U(bmp->zbm_creation_txg, <, 4587 dsl_dataset_phys(new)->ds_creation_txg); 4588 } 4589 4590 *usedp = 0; 4591 *usedp += dsl_dataset_phys(new)->ds_referenced_bytes; 4592 *usedp -= bmp->zbm_referenced_bytes_refd; 4593 4594 *compp = 0; 4595 *compp += dsl_dataset_phys(new)->ds_compressed_bytes; 4596 *compp -= bmp->zbm_compressed_bytes_refd; 4597 4598 *uncompp = 0; 4599 *uncompp += dsl_dataset_phys(new)->ds_uncompressed_bytes; 4600 *uncompp -= bmp->zbm_uncompressed_bytes_refd; 4601 4602 dsl_dataset_t *snap = new; 4603 4604 while (dsl_dataset_phys(snap)->ds_prev_snap_txg > 4605 bmp->zbm_creation_txg) { 4606 uint64_t used, comp, uncomp; 4607 4608 dsl_deadlist_space_range(&snap->ds_deadlist, 4609 0, bmp->zbm_creation_txg, 4610 &used, &comp, &uncomp); 4611 *usedp += used; 4612 *compp += comp; 4613 *uncompp += uncomp; 4614 4615 uint64_t snapobj = dsl_dataset_phys(snap)->ds_prev_snap_obj; 4616 if (snap != new) 4617 dsl_dataset_rele(snap, FTAG); 4618 err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &snap); 4619 if (err != 0) 4620 break; 4621 } 4622 4623 /* 4624 * We might not have the FBN if we are calculating written from 4625 * a snapshot (because we didn't know the correct "next" snapshot 4626 * until now). 4627 */ 4628 if (bmp->zbm_flags & ZBM_FLAG_HAS_FBN) { 4629 *usedp += bmp->zbm_referenced_freed_before_next_snap; 4630 *compp += bmp->zbm_compressed_freed_before_next_snap; 4631 *uncompp += bmp->zbm_uncompressed_freed_before_next_snap; 4632 } else { 4633 ASSERT3U(dsl_dataset_phys(snap)->ds_prev_snap_txg, ==, 4634 bmp->zbm_creation_txg); 4635 uint64_t used, comp, uncomp; 4636 dsl_deadlist_space(&snap->ds_deadlist, &used, &comp, &uncomp); 4637 *usedp += used; 4638 *compp += comp; 4639 *uncompp += uncomp; 4640 } 4641 if (snap != new) 4642 dsl_dataset_rele(snap, FTAG); 4643 return (err); 4644 } 4645 4646 /* 4647 * Return (in *usedp) the amount of space written in new that was not 4648 * present at the time the bookmark corresponds to. New may be a 4649 * snapshot or the head. Old must be a bookmark before new, in 4650 * new's filesystem (or its origin) -- caller verifies this. 4651 */ 4652 int 4653 dsl_dataset_space_written_bookmark(zfs_bookmark_phys_t *bmp, 4654 dsl_dataset_t *new, uint64_t *usedp, uint64_t *compp, uint64_t *uncompp) 4655 { 4656 if (!(bmp->zbm_flags & ZBM_FLAG_HAS_FBN)) 4657 return (SET_ERROR(ENOTSUP)); 4658 return (dsl_dataset_space_written_impl(bmp, new, 4659 usedp, compp, uncompp)); 4660 } 4661 4662 /* 4663 * Return (in *usedp) the amount of space written in new that is not 4664 * present in oldsnap. New may be a snapshot or the head. Old must be 4665 * a snapshot before new, in new's filesystem (or its origin). If not then 4666 * fail and return EINVAL. 4667 */ 4668 int 4669 dsl_dataset_space_written(dsl_dataset_t *oldsnap, dsl_dataset_t *new, 4670 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp) 4671 { 4672 if (!dsl_dataset_is_before(new, oldsnap, 0)) 4673 return (SET_ERROR(EINVAL)); 4674 4675 zfs_bookmark_phys_t zbm = { 0 }; 4676 dsl_dataset_phys_t *dsp = dsl_dataset_phys(oldsnap); 4677 zbm.zbm_guid = dsp->ds_guid; 4678 zbm.zbm_creation_txg = dsp->ds_creation_txg; 4679 zbm.zbm_creation_time = dsp->ds_creation_time; 4680 zbm.zbm_referenced_bytes_refd = dsp->ds_referenced_bytes; 4681 zbm.zbm_compressed_bytes_refd = dsp->ds_compressed_bytes; 4682 zbm.zbm_uncompressed_bytes_refd = dsp->ds_uncompressed_bytes; 4683 4684 /* 4685 * If oldsnap is the origin (or origin's origin, ...) of new, 4686 * we can't easily calculate the effective FBN. Therefore, 4687 * we do not set ZBM_FLAG_HAS_FBN, so that the _impl will calculate 4688 * it relative to the correct "next": the next snapshot towards "new", 4689 * rather than the next snapshot in oldsnap's dsl_dir. 4690 */ 4691 return (dsl_dataset_space_written_impl(&zbm, new, 4692 usedp, compp, uncompp)); 4693 } 4694 4695 /* 4696 * Return (in *usedp) the amount of space that will be reclaimed if firstsnap, 4697 * lastsnap, and all snapshots in between are deleted. 4698 * 4699 * blocks that would be freed [---------------------------] 4700 * snapshots ---O-------O--------O-------O--------O 4701 * firstsnap lastsnap 4702 * 4703 * This is the set of blocks that were born after the snap before firstsnap, 4704 * (birth > firstsnap->prev_snap_txg) and died before the snap after the 4705 * last snap (ie, is on lastsnap->ds_next->ds_deadlist or an earlier deadlist). 4706 * We calculate this by iterating over the relevant deadlists (from the snap 4707 * after lastsnap, backward to the snap after firstsnap), summing up the 4708 * space on the deadlist that was born after the snap before firstsnap. 4709 */ 4710 int 4711 dsl_dataset_space_wouldfree(dsl_dataset_t *firstsnap, 4712 dsl_dataset_t *lastsnap, 4713 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp) 4714 { 4715 int err = 0; 4716 uint64_t snapobj; 4717 dsl_pool_t *dp = firstsnap->ds_dir->dd_pool; 4718 4719 ASSERT(firstsnap->ds_is_snapshot); 4720 ASSERT(lastsnap->ds_is_snapshot); 4721 4722 /* 4723 * Check that the snapshots are in the same dsl_dir, and firstsnap 4724 * is before lastsnap. 4725 */ 4726 if (firstsnap->ds_dir != lastsnap->ds_dir || 4727 dsl_dataset_phys(firstsnap)->ds_creation_txg > 4728 dsl_dataset_phys(lastsnap)->ds_creation_txg) 4729 return (SET_ERROR(EINVAL)); 4730 4731 *usedp = *compp = *uncompp = 0; 4732 4733 snapobj = dsl_dataset_phys(lastsnap)->ds_next_snap_obj; 4734 while (snapobj != firstsnap->ds_object) { 4735 dsl_dataset_t *ds; 4736 uint64_t used, comp, uncomp; 4737 4738 err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &ds); 4739 if (err != 0) 4740 break; 4741 4742 dsl_deadlist_space_range(&ds->ds_deadlist, 4743 dsl_dataset_phys(firstsnap)->ds_prev_snap_txg, UINT64_MAX, 4744 &used, &comp, &uncomp); 4745 *usedp += used; 4746 *compp += comp; 4747 *uncompp += uncomp; 4748 4749 snapobj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 4750 ASSERT3U(snapobj, !=, 0); 4751 dsl_dataset_rele(ds, FTAG); 4752 } 4753 return (err); 4754 } 4755 4756 /* 4757 * Return TRUE if 'earlier' is an earlier snapshot in 'later's timeline. 4758 * For example, they could both be snapshots of the same filesystem, and 4759 * 'earlier' is before 'later'. Or 'earlier' could be the origin of 4760 * 'later's filesystem. Or 'earlier' could be an older snapshot in the origin's 4761 * filesystem. Or 'earlier' could be the origin's origin. 4762 * 4763 * If non-zero, earlier_txg is used instead of earlier's ds_creation_txg. 4764 */ 4765 boolean_t 4766 dsl_dataset_is_before(dsl_dataset_t *later, dsl_dataset_t *earlier, 4767 uint64_t earlier_txg) 4768 { 4769 dsl_pool_t *dp = later->ds_dir->dd_pool; 4770 int error; 4771 boolean_t ret; 4772 4773 ASSERT(dsl_pool_config_held(dp)); 4774 ASSERT(earlier->ds_is_snapshot || earlier_txg != 0); 4775 4776 if (earlier_txg == 0) 4777 earlier_txg = dsl_dataset_phys(earlier)->ds_creation_txg; 4778 4779 if (later->ds_is_snapshot && 4780 earlier_txg >= dsl_dataset_phys(later)->ds_creation_txg) 4781 return (B_FALSE); 4782 4783 if (later->ds_dir == earlier->ds_dir) 4784 return (B_TRUE); 4785 4786 /* 4787 * We check dd_origin_obj explicitly here rather than using 4788 * dsl_dir_is_clone() so that we will return TRUE if "earlier" 4789 * is $ORIGIN@$ORIGIN. dsl_dataset_space_written() depends on 4790 * this behavior. 4791 */ 4792 if (dsl_dir_phys(later->ds_dir)->dd_origin_obj == 0) 4793 return (B_FALSE); 4794 4795 dsl_dataset_t *origin; 4796 error = dsl_dataset_hold_obj(dp, 4797 dsl_dir_phys(later->ds_dir)->dd_origin_obj, FTAG, &origin); 4798 if (error != 0) 4799 return (B_FALSE); 4800 if (dsl_dataset_phys(origin)->ds_creation_txg == earlier_txg && 4801 origin->ds_dir == earlier->ds_dir) { 4802 dsl_dataset_rele(origin, FTAG); 4803 return (B_TRUE); 4804 } 4805 ret = dsl_dataset_is_before(origin, earlier, earlier_txg); 4806 dsl_dataset_rele(origin, FTAG); 4807 return (ret); 4808 } 4809 4810 void 4811 dsl_dataset_zapify(dsl_dataset_t *ds, dmu_tx_t *tx) 4812 { 4813 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 4814 dmu_object_zapify(mos, ds->ds_object, DMU_OT_DSL_DATASET, tx); 4815 } 4816 4817 boolean_t 4818 dsl_dataset_is_zapified(dsl_dataset_t *ds) 4819 { 4820 dmu_object_info_t doi; 4821 4822 dmu_object_info_from_db(ds->ds_dbuf, &doi); 4823 return (doi.doi_type == DMU_OTN_ZAP_METADATA); 4824 } 4825 4826 boolean_t 4827 dsl_dataset_has_resume_receive_state(dsl_dataset_t *ds) 4828 { 4829 return (dsl_dataset_is_zapified(ds) && 4830 zap_contains(ds->ds_dir->dd_pool->dp_meta_objset, 4831 ds->ds_object, DS_FIELD_RESUME_TOGUID) == 0); 4832 } 4833 4834 uint64_t 4835 dsl_dataset_get_remap_deadlist_object(dsl_dataset_t *ds) 4836 { 4837 uint64_t remap_deadlist_obj; 4838 int err; 4839 4840 if (!dsl_dataset_is_zapified(ds)) 4841 return (0); 4842 4843 err = zap_lookup(ds->ds_dir->dd_pool->dp_meta_objset, ds->ds_object, 4844 DS_FIELD_REMAP_DEADLIST, sizeof (remap_deadlist_obj), 1, 4845 &remap_deadlist_obj); 4846 4847 if (err != 0) { 4848 VERIFY3S(err, ==, ENOENT); 4849 return (0); 4850 } 4851 4852 ASSERT(remap_deadlist_obj != 0); 4853 return (remap_deadlist_obj); 4854 } 4855 4856 boolean_t 4857 dsl_dataset_remap_deadlist_exists(dsl_dataset_t *ds) 4858 { 4859 EQUIV(dsl_deadlist_is_open(&ds->ds_remap_deadlist), 4860 dsl_dataset_get_remap_deadlist_object(ds) != 0); 4861 return (dsl_deadlist_is_open(&ds->ds_remap_deadlist)); 4862 } 4863 4864 static void 4865 dsl_dataset_set_remap_deadlist_object(dsl_dataset_t *ds, uint64_t obj, 4866 dmu_tx_t *tx) 4867 { 4868 ASSERT(obj != 0); 4869 dsl_dataset_zapify(ds, tx); 4870 VERIFY0(zap_add(ds->ds_dir->dd_pool->dp_meta_objset, ds->ds_object, 4871 DS_FIELD_REMAP_DEADLIST, sizeof (obj), 1, &obj, tx)); 4872 } 4873 4874 static void 4875 dsl_dataset_unset_remap_deadlist_object(dsl_dataset_t *ds, dmu_tx_t *tx) 4876 { 4877 VERIFY0(zap_remove(ds->ds_dir->dd_pool->dp_meta_objset, 4878 ds->ds_object, DS_FIELD_REMAP_DEADLIST, tx)); 4879 } 4880 4881 void 4882 dsl_dataset_destroy_remap_deadlist(dsl_dataset_t *ds, dmu_tx_t *tx) 4883 { 4884 uint64_t remap_deadlist_object; 4885 spa_t *spa = ds->ds_dir->dd_pool->dp_spa; 4886 4887 ASSERT(dmu_tx_is_syncing(tx)); 4888 ASSERT(dsl_dataset_remap_deadlist_exists(ds)); 4889 4890 remap_deadlist_object = ds->ds_remap_deadlist.dl_object; 4891 dsl_deadlist_close(&ds->ds_remap_deadlist); 4892 dsl_deadlist_free(spa_meta_objset(spa), remap_deadlist_object, tx); 4893 dsl_dataset_unset_remap_deadlist_object(ds, tx); 4894 spa_feature_decr(spa, SPA_FEATURE_OBSOLETE_COUNTS, tx); 4895 } 4896 4897 void 4898 dsl_dataset_create_remap_deadlist(dsl_dataset_t *ds, dmu_tx_t *tx) 4899 { 4900 uint64_t remap_deadlist_obj; 4901 spa_t *spa = ds->ds_dir->dd_pool->dp_spa; 4902 4903 ASSERT(dmu_tx_is_syncing(tx)); 4904 ASSERT(MUTEX_HELD(&ds->ds_remap_deadlist_lock)); 4905 /* 4906 * Currently we only create remap deadlists when there are indirect 4907 * vdevs with referenced mappings. 4908 */ 4909 ASSERT(spa_feature_is_active(spa, SPA_FEATURE_DEVICE_REMOVAL)); 4910 4911 remap_deadlist_obj = dsl_deadlist_clone( 4912 &ds->ds_deadlist, UINT64_MAX, 4913 dsl_dataset_phys(ds)->ds_prev_snap_obj, tx); 4914 dsl_dataset_set_remap_deadlist_object(ds, 4915 remap_deadlist_obj, tx); 4916 dsl_deadlist_open(&ds->ds_remap_deadlist, spa_meta_objset(spa), 4917 remap_deadlist_obj); 4918 spa_feature_incr(spa, SPA_FEATURE_OBSOLETE_COUNTS, tx); 4919 } 4920 4921 void 4922 dsl_dataset_activate_redaction(dsl_dataset_t *ds, uint64_t *redact_snaps, 4923 uint64_t num_redact_snaps, dmu_tx_t *tx) 4924 { 4925 uint64_t dsobj = ds->ds_object; 4926 struct feature_type_uint64_array_arg *ftuaa = 4927 kmem_zalloc(sizeof (*ftuaa), KM_SLEEP); 4928 ftuaa->length = (int64_t)num_redact_snaps; 4929 if (num_redact_snaps > 0) { 4930 ftuaa->array = kmem_alloc(num_redact_snaps * sizeof (uint64_t), 4931 KM_SLEEP); 4932 memcpy(ftuaa->array, redact_snaps, num_redact_snaps * 4933 sizeof (uint64_t)); 4934 } 4935 dsl_dataset_activate_feature(dsobj, SPA_FEATURE_REDACTED_DATASETS, 4936 ftuaa, tx); 4937 ds->ds_feature[SPA_FEATURE_REDACTED_DATASETS] = ftuaa; 4938 } 4939 4940 /* 4941 * Find and return (in *oldest_dsobj) the oldest snapshot of the dsobj 4942 * dataset whose birth time is >= min_txg. 4943 */ 4944 int 4945 dsl_dataset_oldest_snapshot(spa_t *spa, uint64_t head_ds, uint64_t min_txg, 4946 uint64_t *oldest_dsobj) 4947 { 4948 dsl_dataset_t *ds; 4949 dsl_pool_t *dp = spa->spa_dsl_pool; 4950 4951 int error = dsl_dataset_hold_obj(dp, head_ds, FTAG, &ds); 4952 if (error != 0) 4953 return (error); 4954 4955 uint64_t prev_obj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 4956 uint64_t prev_obj_txg = dsl_dataset_phys(ds)->ds_prev_snap_txg; 4957 4958 while (prev_obj != 0 && min_txg < prev_obj_txg) { 4959 dsl_dataset_rele(ds, FTAG); 4960 if ((error = dsl_dataset_hold_obj(dp, prev_obj, 4961 FTAG, &ds)) != 0) 4962 return (error); 4963 prev_obj_txg = dsl_dataset_phys(ds)->ds_prev_snap_txg; 4964 prev_obj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 4965 } 4966 *oldest_dsobj = ds->ds_object; 4967 dsl_dataset_rele(ds, FTAG); 4968 return (0); 4969 } 4970 4971 ZFS_MODULE_PARAM(zfs, zfs_, max_recordsize, UINT, ZMOD_RW, 4972 "Max allowed record size"); 4973 4974 ZFS_MODULE_PARAM(zfs, zfs_, allow_redacted_dataset_mount, INT, ZMOD_RW, 4975 "Allow mounting of redacted datasets"); 4976 4977 ZFS_MODULE_PARAM(zfs, zfs_, snapshot_history_enabled, INT, ZMOD_RW, 4978 "Include snapshot events in pool history/events"); 4979 4980 EXPORT_SYMBOL(dsl_dataset_hold); 4981 EXPORT_SYMBOL(dsl_dataset_hold_flags); 4982 EXPORT_SYMBOL(dsl_dataset_hold_obj); 4983 EXPORT_SYMBOL(dsl_dataset_hold_obj_flags); 4984 EXPORT_SYMBOL(dsl_dataset_own); 4985 EXPORT_SYMBOL(dsl_dataset_own_obj); 4986 EXPORT_SYMBOL(dsl_dataset_name); 4987 EXPORT_SYMBOL(dsl_dataset_rele); 4988 EXPORT_SYMBOL(dsl_dataset_rele_flags); 4989 EXPORT_SYMBOL(dsl_dataset_disown); 4990 EXPORT_SYMBOL(dsl_dataset_tryown); 4991 EXPORT_SYMBOL(dsl_dataset_create_sync); 4992 EXPORT_SYMBOL(dsl_dataset_create_sync_dd); 4993 EXPORT_SYMBOL(dsl_dataset_snapshot_check); 4994 EXPORT_SYMBOL(dsl_dataset_snapshot_sync); 4995 EXPORT_SYMBOL(dsl_dataset_promote); 4996 EXPORT_SYMBOL(dsl_dataset_user_hold); 4997 EXPORT_SYMBOL(dsl_dataset_user_release); 4998 EXPORT_SYMBOL(dsl_dataset_get_holds); 4999 EXPORT_SYMBOL(dsl_dataset_get_blkptr); 5000 EXPORT_SYMBOL(dsl_dataset_get_spa); 5001 EXPORT_SYMBOL(dsl_dataset_modified_since_snap); 5002 EXPORT_SYMBOL(dsl_dataset_space_written); 5003 EXPORT_SYMBOL(dsl_dataset_space_wouldfree); 5004 EXPORT_SYMBOL(dsl_dataset_sync); 5005 EXPORT_SYMBOL(dsl_dataset_block_born); 5006 EXPORT_SYMBOL(dsl_dataset_block_kill); 5007 EXPORT_SYMBOL(dsl_dataset_dirty); 5008 EXPORT_SYMBOL(dsl_dataset_stats); 5009 EXPORT_SYMBOL(dsl_dataset_fast_stat); 5010 EXPORT_SYMBOL(dsl_dataset_space); 5011 EXPORT_SYMBOL(dsl_dataset_fsid_guid); 5012 EXPORT_SYMBOL(dsl_dsobj_to_dsname); 5013 EXPORT_SYMBOL(dsl_dataset_check_quota); 5014 EXPORT_SYMBOL(dsl_dataset_clone_swap_check_impl); 5015 EXPORT_SYMBOL(dsl_dataset_clone_swap_sync_impl); 5016