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 void 2073 dsl_dataset_sync(dsl_dataset_t *ds, zio_t *zio, dmu_tx_t *tx) 2074 { 2075 ASSERT(dmu_tx_is_syncing(tx)); 2076 ASSERT(ds->ds_objset != NULL); 2077 ASSERT(dsl_dataset_phys(ds)->ds_next_snap_obj == 0); 2078 2079 /* 2080 * in case we had to change ds_fsid_guid when we opened it, 2081 * sync it out now. 2082 */ 2083 dmu_buf_will_dirty(ds->ds_dbuf, tx); 2084 dsl_dataset_phys(ds)->ds_fsid_guid = ds->ds_fsid_guid; 2085 2086 if (ds->ds_resume_bytes[tx->tx_txg & TXG_MASK] != 0) { 2087 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset, 2088 ds->ds_object, DS_FIELD_RESUME_OBJECT, 8, 1, 2089 &ds->ds_resume_object[tx->tx_txg & TXG_MASK], tx)); 2090 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset, 2091 ds->ds_object, DS_FIELD_RESUME_OFFSET, 8, 1, 2092 &ds->ds_resume_offset[tx->tx_txg & TXG_MASK], tx)); 2093 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset, 2094 ds->ds_object, DS_FIELD_RESUME_BYTES, 8, 1, 2095 &ds->ds_resume_bytes[tx->tx_txg & TXG_MASK], tx)); 2096 ds->ds_resume_object[tx->tx_txg & TXG_MASK] = 0; 2097 ds->ds_resume_offset[tx->tx_txg & TXG_MASK] = 0; 2098 ds->ds_resume_bytes[tx->tx_txg & TXG_MASK] = 0; 2099 } 2100 2101 dmu_objset_sync(ds->ds_objset, zio, tx); 2102 } 2103 2104 /* 2105 * Check if the percentage of blocks shared between the clone and the 2106 * snapshot (as opposed to those that are clone only) is below a certain 2107 * threshold 2108 */ 2109 static boolean_t 2110 dsl_livelist_should_disable(dsl_dataset_t *ds) 2111 { 2112 uint64_t used, referenced; 2113 int percent_shared; 2114 2115 used = dsl_dir_get_usedds(ds->ds_dir); 2116 referenced = dsl_get_referenced(ds); 2117 if (referenced == 0) 2118 return (B_FALSE); 2119 percent_shared = (100 * (referenced - used)) / referenced; 2120 if (percent_shared <= zfs_livelist_min_percent_shared) 2121 return (B_TRUE); 2122 return (B_FALSE); 2123 } 2124 2125 /* 2126 * Check if it is possible to combine two livelist entries into one. 2127 * This is the case if the combined number of 'live' blkptrs (ALLOCs that 2128 * don't have a matching FREE) is under the maximum sublist size. 2129 * We check this by subtracting twice the total number of frees from the total 2130 * number of blkptrs. FREEs are counted twice because each FREE blkptr 2131 * will cancel out an ALLOC blkptr when the livelist is processed. 2132 */ 2133 static boolean_t 2134 dsl_livelist_should_condense(dsl_deadlist_entry_t *first, 2135 dsl_deadlist_entry_t *next) 2136 { 2137 uint64_t total_free = first->dle_bpobj.bpo_phys->bpo_num_freed + 2138 next->dle_bpobj.bpo_phys->bpo_num_freed; 2139 uint64_t total_entries = first->dle_bpobj.bpo_phys->bpo_num_blkptrs + 2140 next->dle_bpobj.bpo_phys->bpo_num_blkptrs; 2141 if ((total_entries - (2 * total_free)) < zfs_livelist_max_entries) 2142 return (B_TRUE); 2143 return (B_FALSE); 2144 } 2145 2146 typedef struct try_condense_arg { 2147 spa_t *spa; 2148 dsl_dataset_t *ds; 2149 } try_condense_arg_t; 2150 2151 /* 2152 * Iterate over the livelist entries, searching for a pair to condense. 2153 * A nonzero return value means stop, 0 means keep looking. 2154 */ 2155 static int 2156 dsl_livelist_try_condense(void *arg, dsl_deadlist_entry_t *first) 2157 { 2158 try_condense_arg_t *tca = arg; 2159 spa_t *spa = tca->spa; 2160 dsl_dataset_t *ds = tca->ds; 2161 dsl_deadlist_t *ll = &ds->ds_dir->dd_livelist; 2162 dsl_deadlist_entry_t *next; 2163 2164 /* The condense thread has not yet been created at import */ 2165 if (spa->spa_livelist_condense_zthr == NULL) 2166 return (1); 2167 2168 /* A condense is already in progress */ 2169 if (spa->spa_to_condense.ds != NULL) 2170 return (1); 2171 2172 next = AVL_NEXT(&ll->dl_tree, &first->dle_node); 2173 /* The livelist has only one entry - don't condense it */ 2174 if (next == NULL) 2175 return (1); 2176 2177 /* Next is the newest entry - don't condense it */ 2178 if (AVL_NEXT(&ll->dl_tree, &next->dle_node) == NULL) 2179 return (1); 2180 2181 /* This pair is not ready to condense but keep looking */ 2182 if (!dsl_livelist_should_condense(first, next)) 2183 return (0); 2184 2185 /* 2186 * Add a ref to prevent the dataset from being evicted while 2187 * the condense zthr or synctask are running. Ref will be 2188 * released at the end of the condense synctask 2189 */ 2190 dmu_buf_add_ref(ds->ds_dbuf, spa); 2191 2192 spa->spa_to_condense.ds = ds; 2193 spa->spa_to_condense.first = first; 2194 spa->spa_to_condense.next = next; 2195 spa->spa_to_condense.syncing = B_FALSE; 2196 spa->spa_to_condense.cancelled = B_FALSE; 2197 2198 zthr_wakeup(spa->spa_livelist_condense_zthr); 2199 return (1); 2200 } 2201 2202 static void 2203 dsl_flush_pending_livelist(dsl_dataset_t *ds, dmu_tx_t *tx) 2204 { 2205 dsl_dir_t *dd = ds->ds_dir; 2206 spa_t *spa = ds->ds_dir->dd_pool->dp_spa; 2207 dsl_deadlist_entry_t *last = dsl_deadlist_last(&dd->dd_livelist); 2208 2209 /* Check if we need to add a new sub-livelist */ 2210 if (last == NULL) { 2211 /* The livelist is empty */ 2212 dsl_deadlist_add_key(&dd->dd_livelist, 2213 tx->tx_txg - 1, tx); 2214 } else if (spa_sync_pass(spa) == 1) { 2215 /* 2216 * Check if the newest entry is full. If it is, make a new one. 2217 * We only do this once per sync because we could overfill a 2218 * sublist in one sync pass and don't want to add another entry 2219 * for a txg that is already represented. This ensures that 2220 * blkptrs born in the same txg are stored in the same sublist. 2221 */ 2222 bpobj_t bpobj = last->dle_bpobj; 2223 uint64_t all = bpobj.bpo_phys->bpo_num_blkptrs; 2224 uint64_t free = bpobj.bpo_phys->bpo_num_freed; 2225 uint64_t alloc = all - free; 2226 if (alloc > zfs_livelist_max_entries) { 2227 dsl_deadlist_add_key(&dd->dd_livelist, 2228 tx->tx_txg - 1, tx); 2229 } 2230 } 2231 2232 /* Insert each entry into the on-disk livelist */ 2233 bplist_iterate(&dd->dd_pending_allocs, 2234 dsl_deadlist_insert_alloc_cb, &dd->dd_livelist, tx); 2235 bplist_iterate(&dd->dd_pending_frees, 2236 dsl_deadlist_insert_free_cb, &dd->dd_livelist, tx); 2237 2238 /* Attempt to condense every pair of adjacent entries */ 2239 try_condense_arg_t arg = { 2240 .spa = spa, 2241 .ds = ds 2242 }; 2243 dsl_deadlist_iterate(&dd->dd_livelist, dsl_livelist_try_condense, 2244 &arg); 2245 } 2246 2247 void 2248 dsl_dataset_sync_done(dsl_dataset_t *ds, dmu_tx_t *tx) 2249 { 2250 objset_t *os = ds->ds_objset; 2251 2252 bplist_iterate(&ds->ds_pending_deadlist, 2253 dsl_deadlist_insert_alloc_cb, &ds->ds_deadlist, tx); 2254 2255 if (dsl_deadlist_is_open(&ds->ds_dir->dd_livelist)) { 2256 dsl_flush_pending_livelist(ds, tx); 2257 if (dsl_livelist_should_disable(ds)) { 2258 dsl_dir_remove_livelist(ds->ds_dir, tx, B_TRUE); 2259 } 2260 } 2261 2262 dsl_bookmark_sync_done(ds, tx); 2263 2264 multilist_destroy(&os->os_synced_dnodes); 2265 2266 if (os->os_encrypted) 2267 os->os_next_write_raw[tx->tx_txg & TXG_MASK] = B_FALSE; 2268 else 2269 ASSERT0(os->os_next_write_raw[tx->tx_txg & TXG_MASK]); 2270 2271 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 2272 if (zfeature_active(f, 2273 ds->ds_feature_activation[f])) { 2274 if (zfeature_active(f, ds->ds_feature[f])) 2275 continue; 2276 dsl_dataset_activate_feature(ds->ds_object, f, 2277 ds->ds_feature_activation[f], tx); 2278 ds->ds_feature[f] = ds->ds_feature_activation[f]; 2279 } 2280 } 2281 2282 ASSERT(!dmu_objset_is_dirty(os, dmu_tx_get_txg(tx))); 2283 } 2284 2285 int 2286 get_clones_stat_impl(dsl_dataset_t *ds, nvlist_t *val) 2287 { 2288 uint64_t count = 0; 2289 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 2290 zap_cursor_t zc; 2291 zap_attribute_t za; 2292 2293 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool)); 2294 2295 /* 2296 * There may be missing entries in ds_next_clones_obj 2297 * due to a bug in a previous version of the code. 2298 * Only trust it if it has the right number of entries. 2299 */ 2300 if (dsl_dataset_phys(ds)->ds_next_clones_obj != 0) { 2301 VERIFY0(zap_count(mos, dsl_dataset_phys(ds)->ds_next_clones_obj, 2302 &count)); 2303 } 2304 if (count != dsl_dataset_phys(ds)->ds_num_children - 1) { 2305 return (SET_ERROR(ENOENT)); 2306 } 2307 for (zap_cursor_init(&zc, mos, 2308 dsl_dataset_phys(ds)->ds_next_clones_obj); 2309 zap_cursor_retrieve(&zc, &za) == 0; 2310 zap_cursor_advance(&zc)) { 2311 dsl_dataset_t *clone; 2312 char buf[ZFS_MAX_DATASET_NAME_LEN]; 2313 VERIFY0(dsl_dataset_hold_obj(ds->ds_dir->dd_pool, 2314 za.za_first_integer, FTAG, &clone)); 2315 dsl_dir_name(clone->ds_dir, buf); 2316 fnvlist_add_boolean(val, buf); 2317 dsl_dataset_rele(clone, FTAG); 2318 } 2319 zap_cursor_fini(&zc); 2320 return (0); 2321 } 2322 2323 void 2324 get_clones_stat(dsl_dataset_t *ds, nvlist_t *nv) 2325 { 2326 nvlist_t *propval = fnvlist_alloc(); 2327 nvlist_t *val = fnvlist_alloc(); 2328 2329 if (get_clones_stat_impl(ds, val) == 0) { 2330 fnvlist_add_nvlist(propval, ZPROP_VALUE, val); 2331 fnvlist_add_nvlist(nv, zfs_prop_to_name(ZFS_PROP_CLONES), 2332 propval); 2333 } 2334 2335 nvlist_free(val); 2336 nvlist_free(propval); 2337 } 2338 2339 static char * 2340 get_receive_resume_token_impl(dsl_dataset_t *ds) 2341 { 2342 if (!dsl_dataset_has_resume_receive_state(ds)) 2343 return (NULL); 2344 2345 dsl_pool_t *dp = ds->ds_dir->dd_pool; 2346 char *str; 2347 void *packed; 2348 uint8_t *compressed; 2349 uint64_t val; 2350 nvlist_t *token_nv = fnvlist_alloc(); 2351 size_t packed_size, compressed_size; 2352 2353 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 2354 DS_FIELD_RESUME_FROMGUID, sizeof (val), 1, &val) == 0) { 2355 fnvlist_add_uint64(token_nv, "fromguid", val); 2356 } 2357 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 2358 DS_FIELD_RESUME_OBJECT, sizeof (val), 1, &val) == 0) { 2359 fnvlist_add_uint64(token_nv, "object", val); 2360 } 2361 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 2362 DS_FIELD_RESUME_OFFSET, sizeof (val), 1, &val) == 0) { 2363 fnvlist_add_uint64(token_nv, "offset", val); 2364 } 2365 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 2366 DS_FIELD_RESUME_BYTES, sizeof (val), 1, &val) == 0) { 2367 fnvlist_add_uint64(token_nv, "bytes", val); 2368 } 2369 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 2370 DS_FIELD_RESUME_TOGUID, sizeof (val), 1, &val) == 0) { 2371 fnvlist_add_uint64(token_nv, "toguid", val); 2372 } 2373 char buf[MAXNAMELEN]; 2374 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 2375 DS_FIELD_RESUME_TONAME, 1, sizeof (buf), buf) == 0) { 2376 fnvlist_add_string(token_nv, "toname", buf); 2377 } 2378 if (zap_contains(dp->dp_meta_objset, ds->ds_object, 2379 DS_FIELD_RESUME_LARGEBLOCK) == 0) { 2380 fnvlist_add_boolean(token_nv, "largeblockok"); 2381 } 2382 if (zap_contains(dp->dp_meta_objset, ds->ds_object, 2383 DS_FIELD_RESUME_EMBEDOK) == 0) { 2384 fnvlist_add_boolean(token_nv, "embedok"); 2385 } 2386 if (zap_contains(dp->dp_meta_objset, ds->ds_object, 2387 DS_FIELD_RESUME_COMPRESSOK) == 0) { 2388 fnvlist_add_boolean(token_nv, "compressok"); 2389 } 2390 if (zap_contains(dp->dp_meta_objset, ds->ds_object, 2391 DS_FIELD_RESUME_RAWOK) == 0) { 2392 fnvlist_add_boolean(token_nv, "rawok"); 2393 } 2394 if (dsl_dataset_feature_is_active(ds, 2395 SPA_FEATURE_REDACTED_DATASETS)) { 2396 uint64_t num_redact_snaps = 0; 2397 uint64_t *redact_snaps = NULL; 2398 VERIFY3B(dsl_dataset_get_uint64_array_feature(ds, 2399 SPA_FEATURE_REDACTED_DATASETS, &num_redact_snaps, 2400 &redact_snaps), ==, B_TRUE); 2401 fnvlist_add_uint64_array(token_nv, "redact_snaps", 2402 redact_snaps, num_redact_snaps); 2403 } 2404 if (zap_contains(dp->dp_meta_objset, ds->ds_object, 2405 DS_FIELD_RESUME_REDACT_BOOKMARK_SNAPS) == 0) { 2406 uint64_t num_redact_snaps = 0, int_size = 0; 2407 uint64_t *redact_snaps = NULL; 2408 VERIFY0(zap_length(dp->dp_meta_objset, ds->ds_object, 2409 DS_FIELD_RESUME_REDACT_BOOKMARK_SNAPS, &int_size, 2410 &num_redact_snaps)); 2411 ASSERT3U(int_size, ==, sizeof (uint64_t)); 2412 2413 redact_snaps = kmem_alloc(int_size * num_redact_snaps, 2414 KM_SLEEP); 2415 VERIFY0(zap_lookup(dp->dp_meta_objset, ds->ds_object, 2416 DS_FIELD_RESUME_REDACT_BOOKMARK_SNAPS, int_size, 2417 num_redact_snaps, redact_snaps)); 2418 fnvlist_add_uint64_array(token_nv, "book_redact_snaps", 2419 redact_snaps, num_redact_snaps); 2420 kmem_free(redact_snaps, int_size * num_redact_snaps); 2421 } 2422 packed = fnvlist_pack(token_nv, &packed_size); 2423 fnvlist_free(token_nv); 2424 compressed = kmem_alloc(packed_size, KM_SLEEP); 2425 2426 compressed_size = gzip_compress(packed, compressed, 2427 packed_size, packed_size, 6); 2428 2429 zio_cksum_t cksum; 2430 fletcher_4_native_varsize(compressed, compressed_size, &cksum); 2431 2432 size_t alloc_size = compressed_size * 2 + 1; 2433 str = kmem_alloc(alloc_size, KM_SLEEP); 2434 for (int i = 0; i < compressed_size; i++) { 2435 size_t offset = i * 2; 2436 (void) snprintf(str + offset, alloc_size - offset, 2437 "%02x", compressed[i]); 2438 } 2439 str[compressed_size * 2] = '\0'; 2440 char *propval = kmem_asprintf("%u-%llx-%llx-%s", 2441 ZFS_SEND_RESUME_TOKEN_VERSION, 2442 (longlong_t)cksum.zc_word[0], 2443 (longlong_t)packed_size, str); 2444 kmem_free(packed, packed_size); 2445 kmem_free(str, alloc_size); 2446 kmem_free(compressed, packed_size); 2447 return (propval); 2448 } 2449 2450 /* 2451 * Returns a string that represents the receive resume state token. It should 2452 * be freed with strfree(). NULL is returned if no resume state is present. 2453 */ 2454 char * 2455 get_receive_resume_token(dsl_dataset_t *ds) 2456 { 2457 /* 2458 * A failed "newfs" (e.g. full) resumable receive leaves 2459 * the stats set on this dataset. Check here for the prop. 2460 */ 2461 char *token = get_receive_resume_token_impl(ds); 2462 if (token != NULL) 2463 return (token); 2464 /* 2465 * A failed incremental resumable receive leaves the 2466 * stats set on our child named "%recv". Check the child 2467 * for the prop. 2468 */ 2469 /* 6 extra bytes for /%recv */ 2470 char name[ZFS_MAX_DATASET_NAME_LEN + 6]; 2471 dsl_dataset_t *recv_ds; 2472 dsl_dataset_name(ds, name); 2473 if (strlcat(name, "/", sizeof (name)) < sizeof (name) && 2474 strlcat(name, recv_clone_name, sizeof (name)) < sizeof (name) && 2475 dsl_dataset_hold(ds->ds_dir->dd_pool, name, FTAG, &recv_ds) == 0) { 2476 token = get_receive_resume_token_impl(recv_ds); 2477 dsl_dataset_rele(recv_ds, FTAG); 2478 } 2479 return (token); 2480 } 2481 2482 uint64_t 2483 dsl_get_refratio(dsl_dataset_t *ds) 2484 { 2485 uint64_t ratio = dsl_dataset_phys(ds)->ds_compressed_bytes == 0 ? 100 : 2486 (dsl_dataset_phys(ds)->ds_uncompressed_bytes * 100 / 2487 dsl_dataset_phys(ds)->ds_compressed_bytes); 2488 return (ratio); 2489 } 2490 2491 uint64_t 2492 dsl_get_logicalreferenced(dsl_dataset_t *ds) 2493 { 2494 return (dsl_dataset_phys(ds)->ds_uncompressed_bytes); 2495 } 2496 2497 uint64_t 2498 dsl_get_compressratio(dsl_dataset_t *ds) 2499 { 2500 if (ds->ds_is_snapshot) { 2501 return (dsl_get_refratio(ds)); 2502 } else { 2503 dsl_dir_t *dd = ds->ds_dir; 2504 mutex_enter(&dd->dd_lock); 2505 uint64_t val = dsl_dir_get_compressratio(dd); 2506 mutex_exit(&dd->dd_lock); 2507 return (val); 2508 } 2509 } 2510 2511 uint64_t 2512 dsl_get_used(dsl_dataset_t *ds) 2513 { 2514 if (ds->ds_is_snapshot) { 2515 return (dsl_dataset_phys(ds)->ds_unique_bytes); 2516 } else { 2517 dsl_dir_t *dd = ds->ds_dir; 2518 mutex_enter(&dd->dd_lock); 2519 uint64_t val = dsl_dir_get_used(dd); 2520 mutex_exit(&dd->dd_lock); 2521 return (val); 2522 } 2523 } 2524 2525 uint64_t 2526 dsl_get_creation(dsl_dataset_t *ds) 2527 { 2528 return (dsl_dataset_phys(ds)->ds_creation_time); 2529 } 2530 2531 uint64_t 2532 dsl_get_creationtxg(dsl_dataset_t *ds) 2533 { 2534 return (dsl_dataset_phys(ds)->ds_creation_txg); 2535 } 2536 2537 uint64_t 2538 dsl_get_refquota(dsl_dataset_t *ds) 2539 { 2540 return (ds->ds_quota); 2541 } 2542 2543 uint64_t 2544 dsl_get_refreservation(dsl_dataset_t *ds) 2545 { 2546 return (ds->ds_reserved); 2547 } 2548 2549 uint64_t 2550 dsl_get_guid(dsl_dataset_t *ds) 2551 { 2552 return (dsl_dataset_phys(ds)->ds_guid); 2553 } 2554 2555 uint64_t 2556 dsl_get_unique(dsl_dataset_t *ds) 2557 { 2558 return (dsl_dataset_phys(ds)->ds_unique_bytes); 2559 } 2560 2561 uint64_t 2562 dsl_get_objsetid(dsl_dataset_t *ds) 2563 { 2564 return (ds->ds_object); 2565 } 2566 2567 uint64_t 2568 dsl_get_userrefs(dsl_dataset_t *ds) 2569 { 2570 return (ds->ds_userrefs); 2571 } 2572 2573 uint64_t 2574 dsl_get_defer_destroy(dsl_dataset_t *ds) 2575 { 2576 return (DS_IS_DEFER_DESTROY(ds) ? 1 : 0); 2577 } 2578 2579 uint64_t 2580 dsl_get_referenced(dsl_dataset_t *ds) 2581 { 2582 return (dsl_dataset_phys(ds)->ds_referenced_bytes); 2583 } 2584 2585 uint64_t 2586 dsl_get_numclones(dsl_dataset_t *ds) 2587 { 2588 ASSERT(ds->ds_is_snapshot); 2589 return (dsl_dataset_phys(ds)->ds_num_children - 1); 2590 } 2591 2592 uint64_t 2593 dsl_get_inconsistent(dsl_dataset_t *ds) 2594 { 2595 return ((dsl_dataset_phys(ds)->ds_flags & DS_FLAG_INCONSISTENT) ? 2596 1 : 0); 2597 } 2598 2599 uint64_t 2600 dsl_get_redacted(dsl_dataset_t *ds) 2601 { 2602 return (dsl_dataset_feature_is_active(ds, 2603 SPA_FEATURE_REDACTED_DATASETS)); 2604 } 2605 2606 uint64_t 2607 dsl_get_available(dsl_dataset_t *ds) 2608 { 2609 uint64_t refdbytes = dsl_get_referenced(ds); 2610 uint64_t availbytes = dsl_dir_space_available(ds->ds_dir, 2611 NULL, 0, TRUE); 2612 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes) { 2613 availbytes += 2614 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes; 2615 } 2616 if (ds->ds_quota != 0) { 2617 /* 2618 * Adjust available bytes according to refquota 2619 */ 2620 if (refdbytes < ds->ds_quota) { 2621 availbytes = MIN(availbytes, 2622 ds->ds_quota - refdbytes); 2623 } else { 2624 availbytes = 0; 2625 } 2626 } 2627 return (availbytes); 2628 } 2629 2630 int 2631 dsl_get_written(dsl_dataset_t *ds, uint64_t *written) 2632 { 2633 dsl_pool_t *dp = ds->ds_dir->dd_pool; 2634 dsl_dataset_t *prev; 2635 int err = dsl_dataset_hold_obj(dp, 2636 dsl_dataset_phys(ds)->ds_prev_snap_obj, FTAG, &prev); 2637 if (err == 0) { 2638 uint64_t comp, uncomp; 2639 err = dsl_dataset_space_written(prev, ds, written, 2640 &comp, &uncomp); 2641 dsl_dataset_rele(prev, FTAG); 2642 } 2643 return (err); 2644 } 2645 2646 /* 2647 * 'snap' should be a buffer of size ZFS_MAX_DATASET_NAME_LEN. 2648 */ 2649 int 2650 dsl_get_prev_snap(dsl_dataset_t *ds, char *snap) 2651 { 2652 dsl_pool_t *dp = ds->ds_dir->dd_pool; 2653 if (ds->ds_prev != NULL && ds->ds_prev != dp->dp_origin_snap) { 2654 dsl_dataset_name(ds->ds_prev, snap); 2655 return (0); 2656 } else { 2657 return (SET_ERROR(ENOENT)); 2658 } 2659 } 2660 2661 void 2662 dsl_get_redact_snaps(dsl_dataset_t *ds, nvlist_t *propval) 2663 { 2664 uint64_t nsnaps; 2665 uint64_t *snaps; 2666 if (dsl_dataset_get_uint64_array_feature(ds, 2667 SPA_FEATURE_REDACTED_DATASETS, &nsnaps, &snaps)) { 2668 fnvlist_add_uint64_array(propval, ZPROP_VALUE, snaps, 2669 nsnaps); 2670 } 2671 } 2672 2673 /* 2674 * Returns the mountpoint property and source for the given dataset in the value 2675 * and source buffers. The value buffer must be at least as large as MAXPATHLEN 2676 * and the source buffer as least as large a ZFS_MAX_DATASET_NAME_LEN. 2677 * Returns 0 on success and an error on failure. 2678 */ 2679 int 2680 dsl_get_mountpoint(dsl_dataset_t *ds, const char *dsname, char *value, 2681 char *source) 2682 { 2683 int error; 2684 dsl_pool_t *dp = ds->ds_dir->dd_pool; 2685 2686 /* Retrieve the mountpoint value stored in the zap object */ 2687 error = dsl_prop_get_ds(ds, zfs_prop_to_name(ZFS_PROP_MOUNTPOINT), 1, 2688 ZAP_MAXVALUELEN, value, source); 2689 if (error != 0) { 2690 return (error); 2691 } 2692 2693 /* 2694 * Process the dsname and source to find the full mountpoint string. 2695 * Can be skipped for 'legacy' or 'none'. 2696 */ 2697 if (value[0] == '/') { 2698 char *buf = kmem_alloc(ZAP_MAXVALUELEN, KM_SLEEP); 2699 char *root = buf; 2700 const char *relpath; 2701 2702 /* 2703 * If we inherit the mountpoint, even from a dataset 2704 * with a received value, the source will be the path of 2705 * the dataset we inherit from. If source is 2706 * ZPROP_SOURCE_VAL_RECVD, the received value is not 2707 * inherited. 2708 */ 2709 if (strcmp(source, ZPROP_SOURCE_VAL_RECVD) == 0) { 2710 relpath = ""; 2711 } else { 2712 ASSERT0(strncmp(dsname, source, strlen(source))); 2713 relpath = dsname + strlen(source); 2714 if (relpath[0] == '/') 2715 relpath++; 2716 } 2717 2718 spa_altroot(dp->dp_spa, root, ZAP_MAXVALUELEN); 2719 2720 /* 2721 * Special case an alternate root of '/'. This will 2722 * avoid having multiple leading slashes in the 2723 * mountpoint path. 2724 */ 2725 if (strcmp(root, "/") == 0) 2726 root++; 2727 2728 /* 2729 * If the mountpoint is '/' then skip over this 2730 * if we are obtaining either an alternate root or 2731 * an inherited mountpoint. 2732 */ 2733 char *mnt = value; 2734 if (value[1] == '\0' && (root[0] != '\0' || 2735 relpath[0] != '\0')) 2736 mnt = value + 1; 2737 2738 mnt = kmem_strdup(mnt); 2739 2740 if (relpath[0] == '\0') { 2741 (void) snprintf(value, ZAP_MAXVALUELEN, "%s%s", 2742 root, mnt); 2743 } else { 2744 (void) snprintf(value, ZAP_MAXVALUELEN, "%s%s%s%s", 2745 root, mnt, relpath[0] == '@' ? "" : "/", 2746 relpath); 2747 } 2748 kmem_free(buf, ZAP_MAXVALUELEN); 2749 kmem_strfree(mnt); 2750 } 2751 2752 return (0); 2753 } 2754 2755 void 2756 dsl_dataset_stats(dsl_dataset_t *ds, nvlist_t *nv) 2757 { 2758 dsl_pool_t *dp __maybe_unused = ds->ds_dir->dd_pool; 2759 2760 ASSERT(dsl_pool_config_held(dp)); 2761 2762 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRATIO, 2763 dsl_get_refratio(ds)); 2764 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_LOGICALREFERENCED, 2765 dsl_get_logicalreferenced(ds)); 2766 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_COMPRESSRATIO, 2767 dsl_get_compressratio(ds)); 2768 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USED, 2769 dsl_get_used(ds)); 2770 2771 if (ds->ds_is_snapshot) { 2772 get_clones_stat(ds, nv); 2773 } else { 2774 char buf[ZFS_MAX_DATASET_NAME_LEN]; 2775 if (dsl_get_prev_snap(ds, buf) == 0) 2776 dsl_prop_nvlist_add_string(nv, ZFS_PROP_PREV_SNAP, 2777 buf); 2778 dsl_dir_stats(ds->ds_dir, nv); 2779 } 2780 2781 nvlist_t *propval = fnvlist_alloc(); 2782 dsl_get_redact_snaps(ds, propval); 2783 fnvlist_add_nvlist(nv, zfs_prop_to_name(ZFS_PROP_REDACT_SNAPS), 2784 propval); 2785 nvlist_free(propval); 2786 2787 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_AVAILABLE, 2788 dsl_get_available(ds)); 2789 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFERENCED, 2790 dsl_get_referenced(ds)); 2791 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATION, 2792 dsl_get_creation(ds)); 2793 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATETXG, 2794 dsl_get_creationtxg(ds)); 2795 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFQUOTA, 2796 dsl_get_refquota(ds)); 2797 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRESERVATION, 2798 dsl_get_refreservation(ds)); 2799 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_GUID, 2800 dsl_get_guid(ds)); 2801 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_UNIQUE, 2802 dsl_get_unique(ds)); 2803 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_OBJSETID, 2804 dsl_get_objsetid(ds)); 2805 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USERREFS, 2806 dsl_get_userrefs(ds)); 2807 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_DEFER_DESTROY, 2808 dsl_get_defer_destroy(ds)); 2809 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_SNAPSHOTS_CHANGED, 2810 dsl_dir_snap_cmtime(ds->ds_dir).tv_sec); 2811 dsl_dataset_crypt_stats(ds, nv); 2812 2813 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) { 2814 uint64_t written; 2815 if (dsl_get_written(ds, &written) == 0) { 2816 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_WRITTEN, 2817 written); 2818 } 2819 } 2820 2821 if (!dsl_dataset_is_snapshot(ds)) { 2822 char *token = get_receive_resume_token(ds); 2823 if (token != NULL) { 2824 dsl_prop_nvlist_add_string(nv, 2825 ZFS_PROP_RECEIVE_RESUME_TOKEN, token); 2826 kmem_strfree(token); 2827 } 2828 } 2829 } 2830 2831 void 2832 dsl_dataset_fast_stat(dsl_dataset_t *ds, dmu_objset_stats_t *stat) 2833 { 2834 dsl_pool_t *dp __maybe_unused = ds->ds_dir->dd_pool; 2835 ASSERT(dsl_pool_config_held(dp)); 2836 2837 stat->dds_creation_txg = dsl_get_creationtxg(ds); 2838 stat->dds_inconsistent = dsl_get_inconsistent(ds); 2839 stat->dds_guid = dsl_get_guid(ds); 2840 stat->dds_redacted = dsl_get_redacted(ds); 2841 stat->dds_origin[0] = '\0'; 2842 if (ds->ds_is_snapshot) { 2843 stat->dds_is_snapshot = B_TRUE; 2844 stat->dds_num_clones = dsl_get_numclones(ds); 2845 } else { 2846 stat->dds_is_snapshot = B_FALSE; 2847 stat->dds_num_clones = 0; 2848 2849 if (dsl_dir_is_clone(ds->ds_dir)) { 2850 dsl_dir_get_origin(ds->ds_dir, stat->dds_origin); 2851 } 2852 } 2853 } 2854 2855 uint64_t 2856 dsl_dataset_fsid_guid(dsl_dataset_t *ds) 2857 { 2858 return (ds->ds_fsid_guid); 2859 } 2860 2861 void 2862 dsl_dataset_space(dsl_dataset_t *ds, 2863 uint64_t *refdbytesp, uint64_t *availbytesp, 2864 uint64_t *usedobjsp, uint64_t *availobjsp) 2865 { 2866 *refdbytesp = dsl_dataset_phys(ds)->ds_referenced_bytes; 2867 *availbytesp = dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE); 2868 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes) 2869 *availbytesp += 2870 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes; 2871 if (ds->ds_quota != 0) { 2872 /* 2873 * Adjust available bytes according to refquota 2874 */ 2875 if (*refdbytesp < ds->ds_quota) 2876 *availbytesp = MIN(*availbytesp, 2877 ds->ds_quota - *refdbytesp); 2878 else 2879 *availbytesp = 0; 2880 } 2881 rrw_enter(&ds->ds_bp_rwlock, RW_READER, FTAG); 2882 *usedobjsp = BP_GET_FILL(&dsl_dataset_phys(ds)->ds_bp); 2883 rrw_exit(&ds->ds_bp_rwlock, FTAG); 2884 *availobjsp = DN_MAX_OBJECT - *usedobjsp; 2885 } 2886 2887 boolean_t 2888 dsl_dataset_modified_since_snap(dsl_dataset_t *ds, dsl_dataset_t *snap) 2889 { 2890 dsl_pool_t *dp __maybe_unused = ds->ds_dir->dd_pool; 2891 uint64_t birth; 2892 2893 ASSERT(dsl_pool_config_held(dp)); 2894 if (snap == NULL) 2895 return (B_FALSE); 2896 rrw_enter(&ds->ds_bp_rwlock, RW_READER, FTAG); 2897 birth = dsl_dataset_get_blkptr(ds)->blk_birth; 2898 rrw_exit(&ds->ds_bp_rwlock, FTAG); 2899 if (birth > dsl_dataset_phys(snap)->ds_creation_txg) { 2900 objset_t *os, *os_snap; 2901 /* 2902 * It may be that only the ZIL differs, because it was 2903 * reset in the head. Don't count that as being 2904 * modified. 2905 */ 2906 if (dmu_objset_from_ds(ds, &os) != 0) 2907 return (B_TRUE); 2908 if (dmu_objset_from_ds(snap, &os_snap) != 0) 2909 return (B_TRUE); 2910 return (memcmp(&os->os_phys->os_meta_dnode, 2911 &os_snap->os_phys->os_meta_dnode, 2912 sizeof (os->os_phys->os_meta_dnode)) != 0); 2913 } 2914 return (B_FALSE); 2915 } 2916 2917 static int 2918 dsl_dataset_rename_snapshot_check_impl(dsl_pool_t *dp, 2919 dsl_dataset_t *hds, void *arg) 2920 { 2921 (void) dp; 2922 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 2923 int error; 2924 uint64_t val; 2925 2926 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val); 2927 if (error != 0) { 2928 /* ignore nonexistent snapshots */ 2929 return (error == ENOENT ? 0 : error); 2930 } 2931 2932 /* new name should not exist */ 2933 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_newsnapname, &val); 2934 if (error == 0) 2935 error = SET_ERROR(EEXIST); 2936 else if (error == ENOENT) 2937 error = 0; 2938 2939 /* dataset name + 1 for the "@" + the new snapshot name must fit */ 2940 if (dsl_dir_namelen(hds->ds_dir) + 1 + 2941 strlen(ddrsa->ddrsa_newsnapname) >= ZFS_MAX_DATASET_NAME_LEN) 2942 error = SET_ERROR(ENAMETOOLONG); 2943 2944 return (error); 2945 } 2946 2947 int 2948 dsl_dataset_rename_snapshot_check(void *arg, dmu_tx_t *tx) 2949 { 2950 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 2951 dsl_pool_t *dp = dmu_tx_pool(tx); 2952 dsl_dataset_t *hds; 2953 int error; 2954 2955 error = dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds); 2956 if (error != 0) 2957 return (error); 2958 2959 if (ddrsa->ddrsa_recursive) { 2960 error = dmu_objset_find_dp(dp, hds->ds_dir->dd_object, 2961 dsl_dataset_rename_snapshot_check_impl, ddrsa, 2962 DS_FIND_CHILDREN); 2963 } else { 2964 error = dsl_dataset_rename_snapshot_check_impl(dp, hds, ddrsa); 2965 } 2966 dsl_dataset_rele(hds, FTAG); 2967 return (error); 2968 } 2969 2970 static int 2971 dsl_dataset_rename_snapshot_sync_impl(dsl_pool_t *dp, 2972 dsl_dataset_t *hds, void *arg) 2973 { 2974 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 2975 dsl_dataset_t *ds; 2976 uint64_t val; 2977 dmu_tx_t *tx = ddrsa->ddrsa_tx; 2978 int error; 2979 2980 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val); 2981 ASSERT(error == 0 || error == ENOENT); 2982 if (error == ENOENT) { 2983 /* ignore nonexistent snapshots */ 2984 return (0); 2985 } 2986 2987 VERIFY0(dsl_dataset_hold_obj(dp, val, FTAG, &ds)); 2988 2989 /* log before we change the name */ 2990 spa_history_log_internal_ds(ds, "rename", tx, 2991 "-> @%s", ddrsa->ddrsa_newsnapname); 2992 2993 VERIFY0(dsl_dataset_snap_remove(hds, ddrsa->ddrsa_oldsnapname, tx, 2994 B_FALSE)); 2995 mutex_enter(&ds->ds_lock); 2996 (void) strlcpy(ds->ds_snapname, ddrsa->ddrsa_newsnapname, 2997 sizeof (ds->ds_snapname)); 2998 mutex_exit(&ds->ds_lock); 2999 VERIFY0(zap_add(dp->dp_meta_objset, 3000 dsl_dataset_phys(hds)->ds_snapnames_zapobj, 3001 ds->ds_snapname, 8, 1, &ds->ds_object, tx)); 3002 zvol_rename_minors(dp->dp_spa, ddrsa->ddrsa_oldsnapname, 3003 ddrsa->ddrsa_newsnapname, B_TRUE); 3004 3005 dsl_dataset_rele(ds, FTAG); 3006 return (0); 3007 } 3008 3009 void 3010 dsl_dataset_rename_snapshot_sync(void *arg, dmu_tx_t *tx) 3011 { 3012 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 3013 dsl_pool_t *dp = dmu_tx_pool(tx); 3014 dsl_dataset_t *hds = NULL; 3015 3016 VERIFY0(dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds)); 3017 ddrsa->ddrsa_tx = tx; 3018 if (ddrsa->ddrsa_recursive) { 3019 VERIFY0(dmu_objset_find_dp(dp, hds->ds_dir->dd_object, 3020 dsl_dataset_rename_snapshot_sync_impl, ddrsa, 3021 DS_FIND_CHILDREN)); 3022 } else { 3023 VERIFY0(dsl_dataset_rename_snapshot_sync_impl(dp, hds, ddrsa)); 3024 } 3025 dsl_dataset_rele(hds, FTAG); 3026 } 3027 3028 int 3029 dsl_dataset_rename_snapshot(const char *fsname, 3030 const char *oldsnapname, const char *newsnapname, boolean_t recursive) 3031 { 3032 dsl_dataset_rename_snapshot_arg_t ddrsa; 3033 3034 ddrsa.ddrsa_fsname = fsname; 3035 ddrsa.ddrsa_oldsnapname = oldsnapname; 3036 ddrsa.ddrsa_newsnapname = newsnapname; 3037 ddrsa.ddrsa_recursive = recursive; 3038 3039 return (dsl_sync_task(fsname, dsl_dataset_rename_snapshot_check, 3040 dsl_dataset_rename_snapshot_sync, &ddrsa, 3041 1, ZFS_SPACE_CHECK_RESERVED)); 3042 } 3043 3044 /* 3045 * If we're doing an ownership handoff, we need to make sure that there is 3046 * only one long hold on the dataset. We're not allowed to change anything here 3047 * so we don't permanently release the long hold or regular hold here. We want 3048 * to do this only when syncing to avoid the dataset unexpectedly going away 3049 * when we release the long hold. 3050 */ 3051 static int 3052 dsl_dataset_handoff_check(dsl_dataset_t *ds, void *owner, dmu_tx_t *tx) 3053 { 3054 boolean_t held = B_FALSE; 3055 3056 if (!dmu_tx_is_syncing(tx)) 3057 return (0); 3058 3059 dsl_dir_t *dd = ds->ds_dir; 3060 mutex_enter(&dd->dd_activity_lock); 3061 uint64_t holds = zfs_refcount_count(&ds->ds_longholds) - 3062 (owner != NULL ? 1 : 0); 3063 /* 3064 * The value of dd_activity_waiters can chance as soon as we drop the 3065 * lock, but we're fine with that; new waiters coming in or old 3066 * waiters leaving doesn't cause problems, since we're going to cancel 3067 * waiters later anyway. The goal of this check is to verify that no 3068 * non-waiters have long-holds, and all new long-holds will be 3069 * prevented because we're holding the pool config as writer. 3070 */ 3071 if (holds != dd->dd_activity_waiters) 3072 held = B_TRUE; 3073 mutex_exit(&dd->dd_activity_lock); 3074 3075 if (held) 3076 return (SET_ERROR(EBUSY)); 3077 3078 return (0); 3079 } 3080 3081 int 3082 dsl_dataset_rollback_check(void *arg, dmu_tx_t *tx) 3083 { 3084 dsl_dataset_rollback_arg_t *ddra = arg; 3085 dsl_pool_t *dp = dmu_tx_pool(tx); 3086 dsl_dataset_t *ds; 3087 int64_t unused_refres_delta; 3088 int error; 3089 3090 error = dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds); 3091 if (error != 0) 3092 return (error); 3093 3094 /* must not be a snapshot */ 3095 if (ds->ds_is_snapshot) { 3096 dsl_dataset_rele(ds, FTAG); 3097 return (SET_ERROR(EINVAL)); 3098 } 3099 3100 /* must have a most recent snapshot */ 3101 if (dsl_dataset_phys(ds)->ds_prev_snap_txg < TXG_INITIAL) { 3102 dsl_dataset_rele(ds, FTAG); 3103 return (SET_ERROR(ESRCH)); 3104 } 3105 3106 /* 3107 * No rollback to a snapshot created in the current txg, because 3108 * the rollback may dirty the dataset and create blocks that are 3109 * not reachable from the rootbp while having a birth txg that 3110 * falls into the snapshot's range. 3111 */ 3112 if (dmu_tx_is_syncing(tx) && 3113 dsl_dataset_phys(ds)->ds_prev_snap_txg >= tx->tx_txg) { 3114 dsl_dataset_rele(ds, FTAG); 3115 return (SET_ERROR(EAGAIN)); 3116 } 3117 3118 /* 3119 * If the expected target snapshot is specified, then check that 3120 * the latest snapshot is it. 3121 */ 3122 if (ddra->ddra_tosnap != NULL) { 3123 dsl_dataset_t *snapds; 3124 3125 /* Check if the target snapshot exists at all. */ 3126 error = dsl_dataset_hold(dp, ddra->ddra_tosnap, FTAG, &snapds); 3127 if (error != 0) { 3128 /* 3129 * ESRCH is used to signal that the target snapshot does 3130 * not exist, while ENOENT is used to report that 3131 * the rolled back dataset does not exist. 3132 * ESRCH is also used to cover other cases where the 3133 * target snapshot is not related to the dataset being 3134 * rolled back such as being in a different pool. 3135 */ 3136 if (error == ENOENT || error == EXDEV) 3137 error = SET_ERROR(ESRCH); 3138 dsl_dataset_rele(ds, FTAG); 3139 return (error); 3140 } 3141 ASSERT(snapds->ds_is_snapshot); 3142 3143 /* Check if the snapshot is the latest snapshot indeed. */ 3144 if (snapds != ds->ds_prev) { 3145 /* 3146 * Distinguish between the case where the only problem 3147 * is intervening snapshots (EEXIST) vs the snapshot 3148 * not being a valid target for rollback (ESRCH). 3149 */ 3150 if (snapds->ds_dir == ds->ds_dir || 3151 (dsl_dir_is_clone(ds->ds_dir) && 3152 dsl_dir_phys(ds->ds_dir)->dd_origin_obj == 3153 snapds->ds_object)) { 3154 error = SET_ERROR(EEXIST); 3155 } else { 3156 error = SET_ERROR(ESRCH); 3157 } 3158 dsl_dataset_rele(snapds, FTAG); 3159 dsl_dataset_rele(ds, FTAG); 3160 return (error); 3161 } 3162 dsl_dataset_rele(snapds, FTAG); 3163 } 3164 3165 /* must not have any bookmarks after the most recent snapshot */ 3166 if (dsl_bookmark_latest_txg(ds) > 3167 dsl_dataset_phys(ds)->ds_prev_snap_txg) { 3168 dsl_dataset_rele(ds, FTAG); 3169 return (SET_ERROR(EEXIST)); 3170 } 3171 3172 error = dsl_dataset_handoff_check(ds, ddra->ddra_owner, tx); 3173 if (error != 0) { 3174 dsl_dataset_rele(ds, FTAG); 3175 return (error); 3176 } 3177 3178 /* 3179 * Check if the snap we are rolling back to uses more than 3180 * the refquota. 3181 */ 3182 if (ds->ds_quota != 0 && 3183 dsl_dataset_phys(ds->ds_prev)->ds_referenced_bytes > ds->ds_quota) { 3184 dsl_dataset_rele(ds, FTAG); 3185 return (SET_ERROR(EDQUOT)); 3186 } 3187 3188 /* 3189 * When we do the clone swap, we will temporarily use more space 3190 * due to the refreservation (the head will no longer have any 3191 * unique space, so the entire amount of the refreservation will need 3192 * to be free). We will immediately destroy the clone, freeing 3193 * this space, but the freeing happens over many txg's. 3194 */ 3195 unused_refres_delta = (int64_t)MIN(ds->ds_reserved, 3196 dsl_dataset_phys(ds)->ds_unique_bytes); 3197 3198 if (unused_refres_delta > 0 && 3199 unused_refres_delta > 3200 dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE)) { 3201 dsl_dataset_rele(ds, FTAG); 3202 return (SET_ERROR(ENOSPC)); 3203 } 3204 3205 dsl_dataset_rele(ds, FTAG); 3206 return (0); 3207 } 3208 3209 void 3210 dsl_dataset_rollback_sync(void *arg, dmu_tx_t *tx) 3211 { 3212 dsl_dataset_rollback_arg_t *ddra = arg; 3213 dsl_pool_t *dp = dmu_tx_pool(tx); 3214 dsl_dataset_t *ds, *clone; 3215 uint64_t cloneobj; 3216 char namebuf[ZFS_MAX_DATASET_NAME_LEN]; 3217 3218 VERIFY0(dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds)); 3219 3220 dsl_dataset_name(ds->ds_prev, namebuf); 3221 fnvlist_add_string(ddra->ddra_result, "target", namebuf); 3222 3223 cloneobj = dsl_dataset_create_sync(ds->ds_dir, "%rollback", 3224 ds->ds_prev, DS_CREATE_FLAG_NODIRTY, kcred, NULL, tx); 3225 3226 VERIFY0(dsl_dataset_hold_obj(dp, cloneobj, FTAG, &clone)); 3227 3228 dsl_dataset_clone_swap_sync_impl(clone, ds, tx); 3229 dsl_dataset_zero_zil(ds, tx); 3230 3231 dsl_destroy_head_sync_impl(clone, tx); 3232 3233 dsl_dataset_rele(clone, FTAG); 3234 dsl_dataset_rele(ds, FTAG); 3235 } 3236 3237 /* 3238 * Rolls back the given filesystem or volume to the most recent snapshot. 3239 * The name of the most recent snapshot will be returned under key "target" 3240 * in the result nvlist. 3241 * 3242 * If owner != NULL: 3243 * - The existing dataset MUST be owned by the specified owner at entry 3244 * - Upon return, dataset will still be held by the same owner, whether we 3245 * succeed or not. 3246 * 3247 * This mode is required any time the existing filesystem is mounted. See 3248 * notes above zfs_suspend_fs() for further details. 3249 */ 3250 int 3251 dsl_dataset_rollback(const char *fsname, const char *tosnap, void *owner, 3252 nvlist_t *result) 3253 { 3254 dsl_dataset_rollback_arg_t ddra; 3255 3256 ddra.ddra_fsname = fsname; 3257 ddra.ddra_tosnap = tosnap; 3258 ddra.ddra_owner = owner; 3259 ddra.ddra_result = result; 3260 3261 return (dsl_sync_task(fsname, dsl_dataset_rollback_check, 3262 dsl_dataset_rollback_sync, &ddra, 3263 1, ZFS_SPACE_CHECK_RESERVED)); 3264 } 3265 3266 struct promotenode { 3267 list_node_t link; 3268 dsl_dataset_t *ds; 3269 }; 3270 3271 static int snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep); 3272 static int promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp, 3273 const void *tag); 3274 static void promote_rele(dsl_dataset_promote_arg_t *ddpa, const void *tag); 3275 3276 int 3277 dsl_dataset_promote_check(void *arg, dmu_tx_t *tx) 3278 { 3279 dsl_dataset_promote_arg_t *ddpa = arg; 3280 dsl_pool_t *dp = dmu_tx_pool(tx); 3281 dsl_dataset_t *hds; 3282 struct promotenode *snap; 3283 int err; 3284 uint64_t unused; 3285 uint64_t ss_mv_cnt; 3286 size_t max_snap_len; 3287 boolean_t conflicting_snaps; 3288 3289 err = promote_hold(ddpa, dp, FTAG); 3290 if (err != 0) 3291 return (err); 3292 3293 hds = ddpa->ddpa_clone; 3294 max_snap_len = MAXNAMELEN - strlen(ddpa->ddpa_clonename) - 1; 3295 3296 if (dsl_dataset_phys(hds)->ds_flags & DS_FLAG_NOPROMOTE) { 3297 promote_rele(ddpa, FTAG); 3298 return (SET_ERROR(EXDEV)); 3299 } 3300 3301 snap = list_head(&ddpa->shared_snaps); 3302 if (snap == NULL) { 3303 err = SET_ERROR(ENOENT); 3304 goto out; 3305 } 3306 dsl_dataset_t *const origin_ds = snap->ds; 3307 3308 /* 3309 * Encrypted clones share a DSL Crypto Key with their origin's dsl dir. 3310 * When doing a promote we must make sure the encryption root for 3311 * both the target and the target's origin does not change to avoid 3312 * needing to rewrap encryption keys 3313 */ 3314 err = dsl_dataset_promote_crypt_check(hds->ds_dir, origin_ds->ds_dir); 3315 if (err != 0) 3316 goto out; 3317 3318 /* 3319 * Compute and check the amount of space to transfer. Since this is 3320 * so expensive, don't do the preliminary check. 3321 */ 3322 if (!dmu_tx_is_syncing(tx)) { 3323 promote_rele(ddpa, FTAG); 3324 return (0); 3325 } 3326 3327 /* compute origin's new unique space */ 3328 snap = list_tail(&ddpa->clone_snaps); 3329 ASSERT(snap != NULL); 3330 ASSERT3U(dsl_dataset_phys(snap->ds)->ds_prev_snap_obj, ==, 3331 origin_ds->ds_object); 3332 dsl_deadlist_space_range(&snap->ds->ds_deadlist, 3333 dsl_dataset_phys(origin_ds)->ds_prev_snap_txg, UINT64_MAX, 3334 &ddpa->unique, &unused, &unused); 3335 3336 /* 3337 * Walk the snapshots that we are moving 3338 * 3339 * Compute space to transfer. Consider the incremental changes 3340 * to used by each snapshot: 3341 * (my used) = (prev's used) + (blocks born) - (blocks killed) 3342 * So each snapshot gave birth to: 3343 * (blocks born) = (my used) - (prev's used) + (blocks killed) 3344 * So a sequence would look like: 3345 * (uN - u(N-1) + kN) + ... + (u1 - u0 + k1) + (u0 - 0 + k0) 3346 * Which simplifies to: 3347 * uN + kN + kN-1 + ... + k1 + k0 3348 * Note however, if we stop before we reach the ORIGIN we get: 3349 * uN + kN + kN-1 + ... + kM - uM-1 3350 */ 3351 conflicting_snaps = B_FALSE; 3352 ss_mv_cnt = 0; 3353 ddpa->used = dsl_dataset_phys(origin_ds)->ds_referenced_bytes; 3354 ddpa->comp = dsl_dataset_phys(origin_ds)->ds_compressed_bytes; 3355 ddpa->uncomp = dsl_dataset_phys(origin_ds)->ds_uncompressed_bytes; 3356 for (snap = list_head(&ddpa->shared_snaps); snap; 3357 snap = list_next(&ddpa->shared_snaps, snap)) { 3358 uint64_t val, dlused, dlcomp, dluncomp; 3359 dsl_dataset_t *ds = snap->ds; 3360 3361 ss_mv_cnt++; 3362 3363 /* 3364 * If there are long holds, we won't be able to evict 3365 * the objset. 3366 */ 3367 if (dsl_dataset_long_held(ds)) { 3368 err = SET_ERROR(EBUSY); 3369 goto out; 3370 } 3371 3372 /* Check that the snapshot name does not conflict */ 3373 VERIFY0(dsl_dataset_get_snapname(ds)); 3374 if (strlen(ds->ds_snapname) >= max_snap_len) { 3375 err = SET_ERROR(ENAMETOOLONG); 3376 goto out; 3377 } 3378 err = dsl_dataset_snap_lookup(hds, ds->ds_snapname, &val); 3379 if (err == 0) { 3380 fnvlist_add_boolean(ddpa->err_ds, 3381 snap->ds->ds_snapname); 3382 conflicting_snaps = B_TRUE; 3383 } else if (err != ENOENT) { 3384 goto out; 3385 } 3386 3387 /* The very first snapshot does not have a deadlist */ 3388 if (dsl_dataset_phys(ds)->ds_prev_snap_obj == 0) 3389 continue; 3390 3391 dsl_deadlist_space(&ds->ds_deadlist, 3392 &dlused, &dlcomp, &dluncomp); 3393 ddpa->used += dlused; 3394 ddpa->comp += dlcomp; 3395 ddpa->uncomp += dluncomp; 3396 } 3397 3398 /* 3399 * Check that bookmarks that are being transferred don't have 3400 * name conflicts. 3401 */ 3402 for (dsl_bookmark_node_t *dbn = avl_first(&origin_ds->ds_bookmarks); 3403 dbn != NULL && dbn->dbn_phys.zbm_creation_txg <= 3404 dsl_dataset_phys(origin_ds)->ds_creation_txg; 3405 dbn = AVL_NEXT(&origin_ds->ds_bookmarks, dbn)) { 3406 if (strlen(dbn->dbn_name) >= max_snap_len) { 3407 err = SET_ERROR(ENAMETOOLONG); 3408 goto out; 3409 } 3410 zfs_bookmark_phys_t bm; 3411 err = dsl_bookmark_lookup_impl(ddpa->ddpa_clone, 3412 dbn->dbn_name, &bm); 3413 3414 if (err == 0) { 3415 fnvlist_add_boolean(ddpa->err_ds, dbn->dbn_name); 3416 conflicting_snaps = B_TRUE; 3417 } else if (err == ESRCH) { 3418 err = 0; 3419 } 3420 if (err != 0) { 3421 goto out; 3422 } 3423 } 3424 3425 /* 3426 * In order to return the full list of conflicting snapshots, we check 3427 * whether there was a conflict after traversing all of them. 3428 */ 3429 if (conflicting_snaps) { 3430 err = SET_ERROR(EEXIST); 3431 goto out; 3432 } 3433 3434 /* 3435 * If we are a clone of a clone then we never reached ORIGIN, 3436 * so we need to subtract out the clone origin's used space. 3437 */ 3438 if (ddpa->origin_origin) { 3439 ddpa->used -= 3440 dsl_dataset_phys(ddpa->origin_origin)->ds_referenced_bytes; 3441 ddpa->comp -= 3442 dsl_dataset_phys(ddpa->origin_origin)->ds_compressed_bytes; 3443 ddpa->uncomp -= 3444 dsl_dataset_phys(ddpa->origin_origin)-> 3445 ds_uncompressed_bytes; 3446 } 3447 3448 /* Check that there is enough space and limit headroom here */ 3449 err = dsl_dir_transfer_possible(origin_ds->ds_dir, hds->ds_dir, 3450 0, ss_mv_cnt, ddpa->used, ddpa->cr, ddpa->proc); 3451 if (err != 0) 3452 goto out; 3453 3454 /* 3455 * Compute the amounts of space that will be used by snapshots 3456 * after the promotion (for both origin and clone). For each, 3457 * it is the amount of space that will be on all of their 3458 * deadlists (that was not born before their new origin). 3459 */ 3460 if (dsl_dir_phys(hds->ds_dir)->dd_flags & DD_FLAG_USED_BREAKDOWN) { 3461 uint64_t space; 3462 3463 /* 3464 * Note, typically this will not be a clone of a clone, 3465 * so dd_origin_txg will be < TXG_INITIAL, so 3466 * these snaplist_space() -> dsl_deadlist_space_range() 3467 * calls will be fast because they do not have to 3468 * iterate over all bps. 3469 */ 3470 snap = list_head(&ddpa->origin_snaps); 3471 if (snap == NULL) { 3472 err = SET_ERROR(ENOENT); 3473 goto out; 3474 } 3475 err = snaplist_space(&ddpa->shared_snaps, 3476 snap->ds->ds_dir->dd_origin_txg, &ddpa->cloneusedsnap); 3477 if (err != 0) 3478 goto out; 3479 3480 err = snaplist_space(&ddpa->clone_snaps, 3481 snap->ds->ds_dir->dd_origin_txg, &space); 3482 if (err != 0) 3483 goto out; 3484 ddpa->cloneusedsnap += space; 3485 } 3486 if (dsl_dir_phys(origin_ds->ds_dir)->dd_flags & 3487 DD_FLAG_USED_BREAKDOWN) { 3488 err = snaplist_space(&ddpa->origin_snaps, 3489 dsl_dataset_phys(origin_ds)->ds_creation_txg, 3490 &ddpa->originusedsnap); 3491 if (err != 0) 3492 goto out; 3493 } 3494 3495 out: 3496 promote_rele(ddpa, FTAG); 3497 return (err); 3498 } 3499 3500 void 3501 dsl_dataset_promote_sync(void *arg, dmu_tx_t *tx) 3502 { 3503 dsl_dataset_promote_arg_t *ddpa = arg; 3504 dsl_pool_t *dp = dmu_tx_pool(tx); 3505 dsl_dataset_t *hds; 3506 struct promotenode *snap; 3507 dsl_dataset_t *origin_ds; 3508 dsl_dataset_t *origin_head; 3509 dsl_dir_t *dd; 3510 dsl_dir_t *odd = NULL; 3511 uint64_t oldnext_obj; 3512 int64_t delta; 3513 3514 ASSERT(nvlist_empty(ddpa->err_ds)); 3515 3516 VERIFY0(promote_hold(ddpa, dp, FTAG)); 3517 hds = ddpa->ddpa_clone; 3518 3519 ASSERT0(dsl_dataset_phys(hds)->ds_flags & DS_FLAG_NOPROMOTE); 3520 3521 snap = list_head(&ddpa->shared_snaps); 3522 origin_ds = snap->ds; 3523 dd = hds->ds_dir; 3524 3525 snap = list_head(&ddpa->origin_snaps); 3526 origin_head = snap->ds; 3527 3528 /* 3529 * We need to explicitly open odd, since origin_ds's dd will be 3530 * changing. 3531 */ 3532 VERIFY0(dsl_dir_hold_obj(dp, origin_ds->ds_dir->dd_object, 3533 NULL, FTAG, &odd)); 3534 3535 dsl_dataset_promote_crypt_sync(hds->ds_dir, odd, tx); 3536 3537 /* change origin's next snap */ 3538 dmu_buf_will_dirty(origin_ds->ds_dbuf, tx); 3539 oldnext_obj = dsl_dataset_phys(origin_ds)->ds_next_snap_obj; 3540 snap = list_tail(&ddpa->clone_snaps); 3541 ASSERT3U(dsl_dataset_phys(snap->ds)->ds_prev_snap_obj, ==, 3542 origin_ds->ds_object); 3543 dsl_dataset_phys(origin_ds)->ds_next_snap_obj = snap->ds->ds_object; 3544 3545 /* change the origin's next clone */ 3546 if (dsl_dataset_phys(origin_ds)->ds_next_clones_obj) { 3547 dsl_dataset_remove_from_next_clones(origin_ds, 3548 snap->ds->ds_object, tx); 3549 VERIFY0(zap_add_int(dp->dp_meta_objset, 3550 dsl_dataset_phys(origin_ds)->ds_next_clones_obj, 3551 oldnext_obj, tx)); 3552 } 3553 3554 /* change origin */ 3555 dmu_buf_will_dirty(dd->dd_dbuf, tx); 3556 ASSERT3U(dsl_dir_phys(dd)->dd_origin_obj, ==, origin_ds->ds_object); 3557 dsl_dir_phys(dd)->dd_origin_obj = dsl_dir_phys(odd)->dd_origin_obj; 3558 dd->dd_origin_txg = origin_head->ds_dir->dd_origin_txg; 3559 dmu_buf_will_dirty(odd->dd_dbuf, tx); 3560 dsl_dir_phys(odd)->dd_origin_obj = origin_ds->ds_object; 3561 origin_head->ds_dir->dd_origin_txg = 3562 dsl_dataset_phys(origin_ds)->ds_creation_txg; 3563 3564 /* change dd_clone entries */ 3565 if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 3566 VERIFY0(zap_remove_int(dp->dp_meta_objset, 3567 dsl_dir_phys(odd)->dd_clones, hds->ds_object, tx)); 3568 VERIFY0(zap_add_int(dp->dp_meta_objset, 3569 dsl_dir_phys(ddpa->origin_origin->ds_dir)->dd_clones, 3570 hds->ds_object, tx)); 3571 3572 VERIFY0(zap_remove_int(dp->dp_meta_objset, 3573 dsl_dir_phys(ddpa->origin_origin->ds_dir)->dd_clones, 3574 origin_head->ds_object, tx)); 3575 if (dsl_dir_phys(dd)->dd_clones == 0) { 3576 dsl_dir_phys(dd)->dd_clones = 3577 zap_create(dp->dp_meta_objset, DMU_OT_DSL_CLONES, 3578 DMU_OT_NONE, 0, tx); 3579 } 3580 VERIFY0(zap_add_int(dp->dp_meta_objset, 3581 dsl_dir_phys(dd)->dd_clones, origin_head->ds_object, tx)); 3582 } 3583 3584 /* 3585 * Move bookmarks to this dir. 3586 */ 3587 dsl_bookmark_node_t *dbn_next; 3588 for (dsl_bookmark_node_t *dbn = avl_first(&origin_head->ds_bookmarks); 3589 dbn != NULL && dbn->dbn_phys.zbm_creation_txg <= 3590 dsl_dataset_phys(origin_ds)->ds_creation_txg; 3591 dbn = dbn_next) { 3592 dbn_next = AVL_NEXT(&origin_head->ds_bookmarks, dbn); 3593 3594 avl_remove(&origin_head->ds_bookmarks, dbn); 3595 VERIFY0(zap_remove(dp->dp_meta_objset, 3596 origin_head->ds_bookmarks_obj, dbn->dbn_name, tx)); 3597 3598 dsl_bookmark_node_add(hds, dbn, tx); 3599 } 3600 3601 dsl_bookmark_next_changed(hds, origin_ds, tx); 3602 3603 /* move snapshots to this dir */ 3604 for (snap = list_head(&ddpa->shared_snaps); snap; 3605 snap = list_next(&ddpa->shared_snaps, snap)) { 3606 dsl_dataset_t *ds = snap->ds; 3607 3608 /* 3609 * Property callbacks are registered to a particular 3610 * dsl_dir. Since ours is changing, evict the objset 3611 * so that they will be unregistered from the old dsl_dir. 3612 */ 3613 if (ds->ds_objset) { 3614 dmu_objset_evict(ds->ds_objset); 3615 ds->ds_objset = NULL; 3616 } 3617 3618 /* move snap name entry */ 3619 VERIFY0(dsl_dataset_get_snapname(ds)); 3620 VERIFY0(dsl_dataset_snap_remove(origin_head, 3621 ds->ds_snapname, tx, B_TRUE)); 3622 VERIFY0(zap_add(dp->dp_meta_objset, 3623 dsl_dataset_phys(hds)->ds_snapnames_zapobj, ds->ds_snapname, 3624 8, 1, &ds->ds_object, tx)); 3625 dsl_fs_ss_count_adjust(hds->ds_dir, 1, 3626 DD_FIELD_SNAPSHOT_COUNT, tx); 3627 3628 /* change containing dsl_dir */ 3629 dmu_buf_will_dirty(ds->ds_dbuf, tx); 3630 ASSERT3U(dsl_dataset_phys(ds)->ds_dir_obj, ==, odd->dd_object); 3631 dsl_dataset_phys(ds)->ds_dir_obj = dd->dd_object; 3632 ASSERT3P(ds->ds_dir, ==, odd); 3633 dsl_dir_rele(ds->ds_dir, ds); 3634 VERIFY0(dsl_dir_hold_obj(dp, dd->dd_object, 3635 NULL, ds, &ds->ds_dir)); 3636 3637 /* move any clone references */ 3638 if (dsl_dataset_phys(ds)->ds_next_clones_obj && 3639 spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 3640 zap_cursor_t zc; 3641 zap_attribute_t za; 3642 3643 for (zap_cursor_init(&zc, dp->dp_meta_objset, 3644 dsl_dataset_phys(ds)->ds_next_clones_obj); 3645 zap_cursor_retrieve(&zc, &za) == 0; 3646 zap_cursor_advance(&zc)) { 3647 dsl_dataset_t *cnds; 3648 uint64_t o; 3649 3650 if (za.za_first_integer == oldnext_obj) { 3651 /* 3652 * We've already moved the 3653 * origin's reference. 3654 */ 3655 continue; 3656 } 3657 3658 VERIFY0(dsl_dataset_hold_obj(dp, 3659 za.za_first_integer, FTAG, &cnds)); 3660 o = dsl_dir_phys(cnds->ds_dir)-> 3661 dd_head_dataset_obj; 3662 3663 VERIFY0(zap_remove_int(dp->dp_meta_objset, 3664 dsl_dir_phys(odd)->dd_clones, o, tx)); 3665 VERIFY0(zap_add_int(dp->dp_meta_objset, 3666 dsl_dir_phys(dd)->dd_clones, o, tx)); 3667 dsl_dataset_rele(cnds, FTAG); 3668 } 3669 zap_cursor_fini(&zc); 3670 } 3671 3672 ASSERT(!dsl_prop_hascb(ds)); 3673 } 3674 3675 /* 3676 * Change space accounting. 3677 * Note, pa->*usedsnap and dd_used_breakdown[SNAP] will either 3678 * both be valid, or both be 0 (resulting in delta == 0). This 3679 * is true for each of {clone,origin} independently. 3680 */ 3681 3682 delta = ddpa->cloneusedsnap - 3683 dsl_dir_phys(dd)->dd_used_breakdown[DD_USED_SNAP]; 3684 ASSERT3S(delta, >=, 0); 3685 ASSERT3U(ddpa->used, >=, delta); 3686 dsl_dir_diduse_space(dd, DD_USED_SNAP, delta, 0, 0, tx); 3687 dsl_dir_diduse_space(dd, DD_USED_HEAD, 3688 ddpa->used - delta, ddpa->comp, ddpa->uncomp, tx); 3689 3690 delta = ddpa->originusedsnap - 3691 dsl_dir_phys(odd)->dd_used_breakdown[DD_USED_SNAP]; 3692 ASSERT3S(delta, <=, 0); 3693 ASSERT3U(ddpa->used, >=, -delta); 3694 dsl_dir_diduse_space(odd, DD_USED_SNAP, delta, 0, 0, tx); 3695 dsl_dir_diduse_space(odd, DD_USED_HEAD, 3696 -ddpa->used - delta, -ddpa->comp, -ddpa->uncomp, tx); 3697 3698 dsl_dataset_phys(origin_ds)->ds_unique_bytes = ddpa->unique; 3699 3700 /* 3701 * Since livelists are specific to a clone's origin txg, they 3702 * are no longer accurate. Destroy the livelist from the clone being 3703 * promoted. If the origin dataset is a clone, destroy its livelist 3704 * as well. 3705 */ 3706 dsl_dir_remove_livelist(dd, tx, B_TRUE); 3707 dsl_dir_remove_livelist(odd, tx, B_TRUE); 3708 3709 /* log history record */ 3710 spa_history_log_internal_ds(hds, "promote", tx, " "); 3711 3712 dsl_dir_rele(odd, FTAG); 3713 promote_rele(ddpa, FTAG); 3714 3715 /* 3716 * Transfer common error blocks from old head to new head. 3717 */ 3718 if (spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_HEAD_ERRLOG)) { 3719 uint64_t old_head = origin_head->ds_object; 3720 uint64_t new_head = hds->ds_object; 3721 spa_swap_errlog(dp->dp_spa, new_head, old_head, tx); 3722 } 3723 } 3724 3725 /* 3726 * Make a list of dsl_dataset_t's for the snapshots between first_obj 3727 * (exclusive) and last_obj (inclusive). The list will be in reverse 3728 * order (last_obj will be the list_head()). If first_obj == 0, do all 3729 * snapshots back to this dataset's origin. 3730 */ 3731 static int 3732 snaplist_make(dsl_pool_t *dp, 3733 uint64_t first_obj, uint64_t last_obj, list_t *l, const void *tag) 3734 { 3735 uint64_t obj = last_obj; 3736 3737 list_create(l, sizeof (struct promotenode), 3738 offsetof(struct promotenode, link)); 3739 3740 while (obj != first_obj) { 3741 dsl_dataset_t *ds; 3742 struct promotenode *snap; 3743 int err; 3744 3745 err = dsl_dataset_hold_obj(dp, obj, tag, &ds); 3746 ASSERT(err != ENOENT); 3747 if (err != 0) 3748 return (err); 3749 3750 if (first_obj == 0) 3751 first_obj = dsl_dir_phys(ds->ds_dir)->dd_origin_obj; 3752 3753 snap = kmem_alloc(sizeof (*snap), KM_SLEEP); 3754 snap->ds = ds; 3755 list_insert_tail(l, snap); 3756 obj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 3757 } 3758 3759 return (0); 3760 } 3761 3762 static int 3763 snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep) 3764 { 3765 struct promotenode *snap; 3766 3767 *spacep = 0; 3768 for (snap = list_head(l); snap; snap = list_next(l, snap)) { 3769 uint64_t used, comp, uncomp; 3770 dsl_deadlist_space_range(&snap->ds->ds_deadlist, 3771 mintxg, UINT64_MAX, &used, &comp, &uncomp); 3772 *spacep += used; 3773 } 3774 return (0); 3775 } 3776 3777 static void 3778 snaplist_destroy(list_t *l, const void *tag) 3779 { 3780 struct promotenode *snap; 3781 3782 if (l == NULL || !list_link_active(&l->list_head)) 3783 return; 3784 3785 while ((snap = list_remove_tail(l)) != NULL) { 3786 dsl_dataset_rele(snap->ds, tag); 3787 kmem_free(snap, sizeof (*snap)); 3788 } 3789 list_destroy(l); 3790 } 3791 3792 static int 3793 promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp, const void *tag) 3794 { 3795 int error; 3796 dsl_dir_t *dd; 3797 struct promotenode *snap; 3798 3799 error = dsl_dataset_hold(dp, ddpa->ddpa_clonename, tag, 3800 &ddpa->ddpa_clone); 3801 if (error != 0) 3802 return (error); 3803 dd = ddpa->ddpa_clone->ds_dir; 3804 3805 if (ddpa->ddpa_clone->ds_is_snapshot || 3806 !dsl_dir_is_clone(dd)) { 3807 dsl_dataset_rele(ddpa->ddpa_clone, tag); 3808 return (SET_ERROR(EINVAL)); 3809 } 3810 3811 error = snaplist_make(dp, 0, dsl_dir_phys(dd)->dd_origin_obj, 3812 &ddpa->shared_snaps, tag); 3813 if (error != 0) 3814 goto out; 3815 3816 error = snaplist_make(dp, 0, ddpa->ddpa_clone->ds_object, 3817 &ddpa->clone_snaps, tag); 3818 if (error != 0) 3819 goto out; 3820 3821 snap = list_head(&ddpa->shared_snaps); 3822 ASSERT3U(snap->ds->ds_object, ==, dsl_dir_phys(dd)->dd_origin_obj); 3823 error = snaplist_make(dp, dsl_dir_phys(dd)->dd_origin_obj, 3824 dsl_dir_phys(snap->ds->ds_dir)->dd_head_dataset_obj, 3825 &ddpa->origin_snaps, tag); 3826 if (error != 0) 3827 goto out; 3828 3829 if (dsl_dir_phys(snap->ds->ds_dir)->dd_origin_obj != 0) { 3830 error = dsl_dataset_hold_obj(dp, 3831 dsl_dir_phys(snap->ds->ds_dir)->dd_origin_obj, 3832 tag, &ddpa->origin_origin); 3833 if (error != 0) 3834 goto out; 3835 } 3836 out: 3837 if (error != 0) 3838 promote_rele(ddpa, tag); 3839 return (error); 3840 } 3841 3842 static void 3843 promote_rele(dsl_dataset_promote_arg_t *ddpa, const void *tag) 3844 { 3845 snaplist_destroy(&ddpa->shared_snaps, tag); 3846 snaplist_destroy(&ddpa->clone_snaps, tag); 3847 snaplist_destroy(&ddpa->origin_snaps, tag); 3848 if (ddpa->origin_origin != NULL) 3849 dsl_dataset_rele(ddpa->origin_origin, tag); 3850 dsl_dataset_rele(ddpa->ddpa_clone, tag); 3851 } 3852 3853 /* 3854 * Promote a clone. 3855 * 3856 * If it fails due to a conflicting snapshot name, "conflsnap" will be filled 3857 * in with the name. (It must be at least ZFS_MAX_DATASET_NAME_LEN bytes long.) 3858 */ 3859 int 3860 dsl_dataset_promote(const char *name, char *conflsnap) 3861 { 3862 dsl_dataset_promote_arg_t ddpa = { 0 }; 3863 uint64_t numsnaps; 3864 int error; 3865 nvpair_t *snap_pair; 3866 objset_t *os; 3867 3868 /* 3869 * We will modify space proportional to the number of 3870 * snapshots. Compute numsnaps. 3871 */ 3872 error = dmu_objset_hold(name, FTAG, &os); 3873 if (error != 0) 3874 return (error); 3875 error = zap_count(dmu_objset_pool(os)->dp_meta_objset, 3876 dsl_dataset_phys(dmu_objset_ds(os))->ds_snapnames_zapobj, 3877 &numsnaps); 3878 dmu_objset_rele(os, FTAG); 3879 if (error != 0) 3880 return (error); 3881 3882 ddpa.ddpa_clonename = name; 3883 ddpa.err_ds = fnvlist_alloc(); 3884 ddpa.cr = CRED(); 3885 ddpa.proc = curproc; 3886 3887 error = dsl_sync_task(name, dsl_dataset_promote_check, 3888 dsl_dataset_promote_sync, &ddpa, 3889 2 + numsnaps, ZFS_SPACE_CHECK_RESERVED); 3890 3891 /* 3892 * Return the first conflicting snapshot found. 3893 */ 3894 snap_pair = nvlist_next_nvpair(ddpa.err_ds, NULL); 3895 if (snap_pair != NULL && conflsnap != NULL) 3896 (void) strlcpy(conflsnap, nvpair_name(snap_pair), 3897 ZFS_MAX_DATASET_NAME_LEN); 3898 3899 fnvlist_free(ddpa.err_ds); 3900 return (error); 3901 } 3902 3903 int 3904 dsl_dataset_clone_swap_check_impl(dsl_dataset_t *clone, 3905 dsl_dataset_t *origin_head, boolean_t force, void *owner, dmu_tx_t *tx) 3906 { 3907 /* 3908 * "slack" factor for received datasets with refquota set on them. 3909 * See the bottom of this function for details on its use. 3910 */ 3911 uint64_t refquota_slack = (uint64_t)DMU_MAX_ACCESS * 3912 spa_asize_inflation; 3913 int64_t unused_refres_delta; 3914 3915 /* they should both be heads */ 3916 if (clone->ds_is_snapshot || 3917 origin_head->ds_is_snapshot) 3918 return (SET_ERROR(EINVAL)); 3919 3920 /* if we are not forcing, the branch point should be just before them */ 3921 if (!force && clone->ds_prev != origin_head->ds_prev) 3922 return (SET_ERROR(EINVAL)); 3923 3924 /* clone should be the clone (unless they are unrelated) */ 3925 if (clone->ds_prev != NULL && 3926 clone->ds_prev != clone->ds_dir->dd_pool->dp_origin_snap && 3927 origin_head->ds_dir != clone->ds_prev->ds_dir) 3928 return (SET_ERROR(EINVAL)); 3929 3930 /* the clone should be a child of the origin */ 3931 if (clone->ds_dir->dd_parent != origin_head->ds_dir) 3932 return (SET_ERROR(EINVAL)); 3933 3934 /* origin_head shouldn't be modified unless 'force' */ 3935 if (!force && 3936 dsl_dataset_modified_since_snap(origin_head, origin_head->ds_prev)) 3937 return (SET_ERROR(ETXTBSY)); 3938 3939 /* origin_head should have no long holds (e.g. is not mounted) */ 3940 if (dsl_dataset_handoff_check(origin_head, owner, tx)) 3941 return (SET_ERROR(EBUSY)); 3942 3943 /* check amount of any unconsumed refreservation */ 3944 unused_refres_delta = 3945 (int64_t)MIN(origin_head->ds_reserved, 3946 dsl_dataset_phys(origin_head)->ds_unique_bytes) - 3947 (int64_t)MIN(origin_head->ds_reserved, 3948 dsl_dataset_phys(clone)->ds_unique_bytes); 3949 3950 if (unused_refres_delta > 0 && 3951 unused_refres_delta > 3952 dsl_dir_space_available(origin_head->ds_dir, NULL, 0, TRUE)) 3953 return (SET_ERROR(ENOSPC)); 3954 3955 /* 3956 * The clone can't be too much over the head's refquota. 3957 * 3958 * To ensure that the entire refquota can be used, we allow one 3959 * transaction to exceed the refquota. Therefore, this check 3960 * needs to also allow for the space referenced to be more than the 3961 * refquota. The maximum amount of space that one transaction can use 3962 * on disk is DMU_MAX_ACCESS * spa_asize_inflation. Allowing this 3963 * overage ensures that we are able to receive a filesystem that 3964 * exceeds the refquota on the source system. 3965 * 3966 * So that overage is the refquota_slack we use below. 3967 */ 3968 if (origin_head->ds_quota != 0 && 3969 dsl_dataset_phys(clone)->ds_referenced_bytes > 3970 origin_head->ds_quota + refquota_slack) 3971 return (SET_ERROR(EDQUOT)); 3972 3973 return (0); 3974 } 3975 3976 static void 3977 dsl_dataset_swap_remap_deadlists(dsl_dataset_t *clone, 3978 dsl_dataset_t *origin, dmu_tx_t *tx) 3979 { 3980 uint64_t clone_remap_dl_obj, origin_remap_dl_obj; 3981 dsl_pool_t *dp = dmu_tx_pool(tx); 3982 3983 ASSERT(dsl_pool_sync_context(dp)); 3984 3985 clone_remap_dl_obj = dsl_dataset_get_remap_deadlist_object(clone); 3986 origin_remap_dl_obj = dsl_dataset_get_remap_deadlist_object(origin); 3987 3988 if (clone_remap_dl_obj != 0) { 3989 dsl_deadlist_close(&clone->ds_remap_deadlist); 3990 dsl_dataset_unset_remap_deadlist_object(clone, tx); 3991 } 3992 if (origin_remap_dl_obj != 0) { 3993 dsl_deadlist_close(&origin->ds_remap_deadlist); 3994 dsl_dataset_unset_remap_deadlist_object(origin, tx); 3995 } 3996 3997 if (clone_remap_dl_obj != 0) { 3998 dsl_dataset_set_remap_deadlist_object(origin, 3999 clone_remap_dl_obj, tx); 4000 dsl_deadlist_open(&origin->ds_remap_deadlist, 4001 dp->dp_meta_objset, clone_remap_dl_obj); 4002 } 4003 if (origin_remap_dl_obj != 0) { 4004 dsl_dataset_set_remap_deadlist_object(clone, 4005 origin_remap_dl_obj, tx); 4006 dsl_deadlist_open(&clone->ds_remap_deadlist, 4007 dp->dp_meta_objset, origin_remap_dl_obj); 4008 } 4009 } 4010 4011 void 4012 dsl_dataset_clone_swap_sync_impl(dsl_dataset_t *clone, 4013 dsl_dataset_t *origin_head, dmu_tx_t *tx) 4014 { 4015 dsl_pool_t *dp = dmu_tx_pool(tx); 4016 int64_t unused_refres_delta; 4017 4018 ASSERT(clone->ds_reserved == 0); 4019 /* 4020 * NOTE: On DEBUG kernels there could be a race between this and 4021 * the check function if spa_asize_inflation is adjusted... 4022 */ 4023 ASSERT(origin_head->ds_quota == 0 || 4024 dsl_dataset_phys(clone)->ds_unique_bytes <= origin_head->ds_quota + 4025 DMU_MAX_ACCESS * spa_asize_inflation); 4026 ASSERT3P(clone->ds_prev, ==, origin_head->ds_prev); 4027 4028 dsl_dir_cancel_waiters(origin_head->ds_dir); 4029 4030 /* 4031 * Swap per-dataset feature flags. 4032 */ 4033 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 4034 if (!(spa_feature_table[f].fi_flags & 4035 ZFEATURE_FLAG_PER_DATASET)) { 4036 ASSERT(!dsl_dataset_feature_is_active(clone, f)); 4037 ASSERT(!dsl_dataset_feature_is_active(origin_head, f)); 4038 continue; 4039 } 4040 4041 boolean_t clone_inuse = dsl_dataset_feature_is_active(clone, f); 4042 void *clone_feature = clone->ds_feature[f]; 4043 boolean_t origin_head_inuse = 4044 dsl_dataset_feature_is_active(origin_head, f); 4045 void *origin_head_feature = origin_head->ds_feature[f]; 4046 4047 if (clone_inuse) 4048 dsl_dataset_deactivate_feature_impl(clone, f, tx); 4049 if (origin_head_inuse) 4050 dsl_dataset_deactivate_feature_impl(origin_head, f, tx); 4051 4052 if (clone_inuse) { 4053 dsl_dataset_activate_feature(origin_head->ds_object, f, 4054 clone_feature, tx); 4055 origin_head->ds_feature[f] = clone_feature; 4056 } 4057 if (origin_head_inuse) { 4058 dsl_dataset_activate_feature(clone->ds_object, f, 4059 origin_head_feature, tx); 4060 clone->ds_feature[f] = origin_head_feature; 4061 } 4062 } 4063 4064 dmu_buf_will_dirty(clone->ds_dbuf, tx); 4065 dmu_buf_will_dirty(origin_head->ds_dbuf, tx); 4066 4067 if (clone->ds_objset != NULL) { 4068 dmu_objset_evict(clone->ds_objset); 4069 clone->ds_objset = NULL; 4070 } 4071 4072 if (origin_head->ds_objset != NULL) { 4073 dmu_objset_evict(origin_head->ds_objset); 4074 origin_head->ds_objset = NULL; 4075 } 4076 4077 unused_refres_delta = 4078 (int64_t)MIN(origin_head->ds_reserved, 4079 dsl_dataset_phys(origin_head)->ds_unique_bytes) - 4080 (int64_t)MIN(origin_head->ds_reserved, 4081 dsl_dataset_phys(clone)->ds_unique_bytes); 4082 4083 /* 4084 * Reset origin's unique bytes. 4085 */ 4086 { 4087 dsl_dataset_t *origin = clone->ds_prev; 4088 uint64_t comp, uncomp; 4089 4090 dmu_buf_will_dirty(origin->ds_dbuf, tx); 4091 dsl_deadlist_space_range(&clone->ds_deadlist, 4092 dsl_dataset_phys(origin)->ds_prev_snap_txg, UINT64_MAX, 4093 &dsl_dataset_phys(origin)->ds_unique_bytes, &comp, &uncomp); 4094 } 4095 4096 /* swap blkptrs */ 4097 { 4098 rrw_enter(&clone->ds_bp_rwlock, RW_WRITER, FTAG); 4099 rrw_enter(&origin_head->ds_bp_rwlock, RW_WRITER, FTAG); 4100 blkptr_t tmp; 4101 tmp = dsl_dataset_phys(origin_head)->ds_bp; 4102 dsl_dataset_phys(origin_head)->ds_bp = 4103 dsl_dataset_phys(clone)->ds_bp; 4104 dsl_dataset_phys(clone)->ds_bp = tmp; 4105 rrw_exit(&origin_head->ds_bp_rwlock, FTAG); 4106 rrw_exit(&clone->ds_bp_rwlock, FTAG); 4107 } 4108 4109 /* set dd_*_bytes */ 4110 { 4111 int64_t dused, dcomp, duncomp; 4112 uint64_t cdl_used, cdl_comp, cdl_uncomp; 4113 uint64_t odl_used, odl_comp, odl_uncomp; 4114 4115 ASSERT3U(dsl_dir_phys(clone->ds_dir)-> 4116 dd_used_breakdown[DD_USED_SNAP], ==, 0); 4117 4118 dsl_deadlist_space(&clone->ds_deadlist, 4119 &cdl_used, &cdl_comp, &cdl_uncomp); 4120 dsl_deadlist_space(&origin_head->ds_deadlist, 4121 &odl_used, &odl_comp, &odl_uncomp); 4122 4123 dused = dsl_dataset_phys(clone)->ds_referenced_bytes + 4124 cdl_used - 4125 (dsl_dataset_phys(origin_head)->ds_referenced_bytes + 4126 odl_used); 4127 dcomp = dsl_dataset_phys(clone)->ds_compressed_bytes + 4128 cdl_comp - 4129 (dsl_dataset_phys(origin_head)->ds_compressed_bytes + 4130 odl_comp); 4131 duncomp = dsl_dataset_phys(clone)->ds_uncompressed_bytes + 4132 cdl_uncomp - 4133 (dsl_dataset_phys(origin_head)->ds_uncompressed_bytes + 4134 odl_uncomp); 4135 4136 dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_HEAD, 4137 dused, dcomp, duncomp, tx); 4138 dsl_dir_diduse_space(clone->ds_dir, DD_USED_HEAD, 4139 -dused, -dcomp, -duncomp, tx); 4140 4141 /* 4142 * The difference in the space used by snapshots is the 4143 * difference in snapshot space due to the head's 4144 * deadlist (since that's the only thing that's 4145 * changing that affects the snapused). 4146 */ 4147 dsl_deadlist_space_range(&clone->ds_deadlist, 4148 origin_head->ds_dir->dd_origin_txg, UINT64_MAX, 4149 &cdl_used, &cdl_comp, &cdl_uncomp); 4150 dsl_deadlist_space_range(&origin_head->ds_deadlist, 4151 origin_head->ds_dir->dd_origin_txg, UINT64_MAX, 4152 &odl_used, &odl_comp, &odl_uncomp); 4153 dsl_dir_transfer_space(origin_head->ds_dir, cdl_used - odl_used, 4154 DD_USED_HEAD, DD_USED_SNAP, tx); 4155 } 4156 4157 /* swap ds_*_bytes */ 4158 SWITCH64(dsl_dataset_phys(origin_head)->ds_referenced_bytes, 4159 dsl_dataset_phys(clone)->ds_referenced_bytes); 4160 SWITCH64(dsl_dataset_phys(origin_head)->ds_compressed_bytes, 4161 dsl_dataset_phys(clone)->ds_compressed_bytes); 4162 SWITCH64(dsl_dataset_phys(origin_head)->ds_uncompressed_bytes, 4163 dsl_dataset_phys(clone)->ds_uncompressed_bytes); 4164 SWITCH64(dsl_dataset_phys(origin_head)->ds_unique_bytes, 4165 dsl_dataset_phys(clone)->ds_unique_bytes); 4166 4167 /* apply any parent delta for change in unconsumed refreservation */ 4168 dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_REFRSRV, 4169 unused_refres_delta, 0, 0, tx); 4170 4171 /* 4172 * Swap deadlists. 4173 */ 4174 dsl_deadlist_close(&clone->ds_deadlist); 4175 dsl_deadlist_close(&origin_head->ds_deadlist); 4176 SWITCH64(dsl_dataset_phys(origin_head)->ds_deadlist_obj, 4177 dsl_dataset_phys(clone)->ds_deadlist_obj); 4178 dsl_deadlist_open(&clone->ds_deadlist, dp->dp_meta_objset, 4179 dsl_dataset_phys(clone)->ds_deadlist_obj); 4180 dsl_deadlist_open(&origin_head->ds_deadlist, dp->dp_meta_objset, 4181 dsl_dataset_phys(origin_head)->ds_deadlist_obj); 4182 dsl_dataset_swap_remap_deadlists(clone, origin_head, tx); 4183 4184 /* 4185 * If there is a bookmark at the origin, its "next dataset" is 4186 * changing, so we need to reset its FBN. 4187 */ 4188 dsl_bookmark_next_changed(origin_head, origin_head->ds_prev, tx); 4189 4190 dsl_scan_ds_clone_swapped(origin_head, clone, tx); 4191 4192 /* 4193 * Destroy any livelists associated with the clone or the origin, 4194 * since after the swap the corresponding livelists are no longer 4195 * valid. 4196 */ 4197 dsl_dir_remove_livelist(clone->ds_dir, tx, B_TRUE); 4198 dsl_dir_remove_livelist(origin_head->ds_dir, tx, B_TRUE); 4199 4200 spa_history_log_internal_ds(clone, "clone swap", tx, 4201 "parent=%s", origin_head->ds_dir->dd_myname); 4202 } 4203 4204 /* 4205 * Given a pool name and a dataset object number in that pool, 4206 * return the name of that dataset. 4207 */ 4208 int 4209 dsl_dsobj_to_dsname(char *pname, uint64_t obj, char *buf) 4210 { 4211 dsl_pool_t *dp; 4212 dsl_dataset_t *ds; 4213 int error; 4214 4215 error = dsl_pool_hold(pname, FTAG, &dp); 4216 if (error != 0) 4217 return (error); 4218 4219 error = dsl_dataset_hold_obj(dp, obj, FTAG, &ds); 4220 if (error == 0) { 4221 dsl_dataset_name(ds, buf); 4222 dsl_dataset_rele(ds, FTAG); 4223 } 4224 dsl_pool_rele(dp, FTAG); 4225 4226 return (error); 4227 } 4228 4229 int 4230 dsl_dataset_check_quota(dsl_dataset_t *ds, boolean_t check_quota, 4231 uint64_t asize, uint64_t inflight, uint64_t *used, uint64_t *ref_rsrv) 4232 { 4233 int error = 0; 4234 4235 ASSERT3S(asize, >, 0); 4236 4237 /* 4238 * *ref_rsrv is the portion of asize that will come from any 4239 * unconsumed refreservation space. 4240 */ 4241 *ref_rsrv = 0; 4242 4243 mutex_enter(&ds->ds_lock); 4244 /* 4245 * Make a space adjustment for reserved bytes. 4246 */ 4247 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes) { 4248 ASSERT3U(*used, >=, 4249 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes); 4250 *used -= 4251 (ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes); 4252 *ref_rsrv = 4253 asize - MIN(asize, parent_delta(ds, asize + inflight)); 4254 } 4255 4256 if (!check_quota || ds->ds_quota == 0) { 4257 mutex_exit(&ds->ds_lock); 4258 return (0); 4259 } 4260 /* 4261 * If they are requesting more space, and our current estimate 4262 * is over quota, they get to try again unless the actual 4263 * on-disk is over quota and there are no pending changes (which 4264 * may free up space for us). 4265 */ 4266 if (dsl_dataset_phys(ds)->ds_referenced_bytes + inflight >= 4267 ds->ds_quota) { 4268 if (inflight > 0 || 4269 dsl_dataset_phys(ds)->ds_referenced_bytes < ds->ds_quota) 4270 error = SET_ERROR(ERESTART); 4271 else 4272 error = SET_ERROR(EDQUOT); 4273 } 4274 mutex_exit(&ds->ds_lock); 4275 4276 return (error); 4277 } 4278 4279 typedef struct dsl_dataset_set_qr_arg { 4280 const char *ddsqra_name; 4281 zprop_source_t ddsqra_source; 4282 uint64_t ddsqra_value; 4283 } dsl_dataset_set_qr_arg_t; 4284 4285 4286 static int 4287 dsl_dataset_set_refquota_check(void *arg, dmu_tx_t *tx) 4288 { 4289 dsl_dataset_set_qr_arg_t *ddsqra = arg; 4290 dsl_pool_t *dp = dmu_tx_pool(tx); 4291 dsl_dataset_t *ds; 4292 int error; 4293 uint64_t newval; 4294 4295 if (spa_version(dp->dp_spa) < SPA_VERSION_REFQUOTA) 4296 return (SET_ERROR(ENOTSUP)); 4297 4298 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds); 4299 if (error != 0) 4300 return (error); 4301 4302 if (ds->ds_is_snapshot) { 4303 dsl_dataset_rele(ds, FTAG); 4304 return (SET_ERROR(EINVAL)); 4305 } 4306 4307 error = dsl_prop_predict(ds->ds_dir, 4308 zfs_prop_to_name(ZFS_PROP_REFQUOTA), 4309 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval); 4310 if (error != 0) { 4311 dsl_dataset_rele(ds, FTAG); 4312 return (error); 4313 } 4314 4315 if (newval == 0) { 4316 dsl_dataset_rele(ds, FTAG); 4317 return (0); 4318 } 4319 4320 if (newval < dsl_dataset_phys(ds)->ds_referenced_bytes || 4321 newval < ds->ds_reserved) { 4322 dsl_dataset_rele(ds, FTAG); 4323 return (SET_ERROR(ENOSPC)); 4324 } 4325 4326 dsl_dataset_rele(ds, FTAG); 4327 return (0); 4328 } 4329 4330 static void 4331 dsl_dataset_set_refquota_sync(void *arg, dmu_tx_t *tx) 4332 { 4333 dsl_dataset_set_qr_arg_t *ddsqra = arg; 4334 dsl_pool_t *dp = dmu_tx_pool(tx); 4335 dsl_dataset_t *ds = NULL; 4336 uint64_t newval; 4337 4338 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds)); 4339 4340 dsl_prop_set_sync_impl(ds, 4341 zfs_prop_to_name(ZFS_PROP_REFQUOTA), 4342 ddsqra->ddsqra_source, sizeof (ddsqra->ddsqra_value), 1, 4343 &ddsqra->ddsqra_value, tx); 4344 4345 VERIFY0(dsl_prop_get_int_ds(ds, 4346 zfs_prop_to_name(ZFS_PROP_REFQUOTA), &newval)); 4347 4348 if (ds->ds_quota != newval) { 4349 dmu_buf_will_dirty(ds->ds_dbuf, tx); 4350 ds->ds_quota = newval; 4351 } 4352 dsl_dataset_rele(ds, FTAG); 4353 } 4354 4355 int 4356 dsl_dataset_set_refquota(const char *dsname, zprop_source_t source, 4357 uint64_t refquota) 4358 { 4359 dsl_dataset_set_qr_arg_t ddsqra; 4360 4361 ddsqra.ddsqra_name = dsname; 4362 ddsqra.ddsqra_source = source; 4363 ddsqra.ddsqra_value = refquota; 4364 4365 return (dsl_sync_task(dsname, dsl_dataset_set_refquota_check, 4366 dsl_dataset_set_refquota_sync, &ddsqra, 0, 4367 ZFS_SPACE_CHECK_EXTRA_RESERVED)); 4368 } 4369 4370 static int 4371 dsl_dataset_set_refreservation_check(void *arg, dmu_tx_t *tx) 4372 { 4373 dsl_dataset_set_qr_arg_t *ddsqra = arg; 4374 dsl_pool_t *dp = dmu_tx_pool(tx); 4375 dsl_dataset_t *ds; 4376 int error; 4377 uint64_t newval, unique; 4378 4379 if (spa_version(dp->dp_spa) < SPA_VERSION_REFRESERVATION) 4380 return (SET_ERROR(ENOTSUP)); 4381 4382 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds); 4383 if (error != 0) 4384 return (error); 4385 4386 if (ds->ds_is_snapshot) { 4387 dsl_dataset_rele(ds, FTAG); 4388 return (SET_ERROR(EINVAL)); 4389 } 4390 4391 error = dsl_prop_predict(ds->ds_dir, 4392 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 4393 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval); 4394 if (error != 0) { 4395 dsl_dataset_rele(ds, FTAG); 4396 return (error); 4397 } 4398 4399 /* 4400 * If we are doing the preliminary check in open context, the 4401 * space estimates may be inaccurate. 4402 */ 4403 if (!dmu_tx_is_syncing(tx)) { 4404 dsl_dataset_rele(ds, FTAG); 4405 return (0); 4406 } 4407 4408 mutex_enter(&ds->ds_lock); 4409 if (!DS_UNIQUE_IS_ACCURATE(ds)) 4410 dsl_dataset_recalc_head_uniq(ds); 4411 unique = dsl_dataset_phys(ds)->ds_unique_bytes; 4412 mutex_exit(&ds->ds_lock); 4413 4414 if (MAX(unique, newval) > MAX(unique, ds->ds_reserved)) { 4415 uint64_t delta = MAX(unique, newval) - 4416 MAX(unique, ds->ds_reserved); 4417 4418 if (delta > 4419 dsl_dir_space_available(ds->ds_dir, NULL, 0, B_TRUE) || 4420 (ds->ds_quota > 0 && newval > ds->ds_quota)) { 4421 dsl_dataset_rele(ds, FTAG); 4422 return (SET_ERROR(ENOSPC)); 4423 } 4424 } 4425 4426 dsl_dataset_rele(ds, FTAG); 4427 return (0); 4428 } 4429 4430 void 4431 dsl_dataset_set_refreservation_sync_impl(dsl_dataset_t *ds, 4432 zprop_source_t source, uint64_t value, dmu_tx_t *tx) 4433 { 4434 uint64_t newval; 4435 uint64_t unique; 4436 int64_t delta; 4437 4438 dsl_prop_set_sync_impl(ds, zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 4439 source, sizeof (value), 1, &value, tx); 4440 4441 VERIFY0(dsl_prop_get_int_ds(ds, 4442 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), &newval)); 4443 4444 dmu_buf_will_dirty(ds->ds_dbuf, tx); 4445 mutex_enter(&ds->ds_dir->dd_lock); 4446 mutex_enter(&ds->ds_lock); 4447 ASSERT(DS_UNIQUE_IS_ACCURATE(ds)); 4448 unique = dsl_dataset_phys(ds)->ds_unique_bytes; 4449 delta = MAX(0, (int64_t)(newval - unique)) - 4450 MAX(0, (int64_t)(ds->ds_reserved - unique)); 4451 ds->ds_reserved = newval; 4452 mutex_exit(&ds->ds_lock); 4453 4454 dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV, delta, 0, 0, tx); 4455 mutex_exit(&ds->ds_dir->dd_lock); 4456 } 4457 4458 static void 4459 dsl_dataset_set_refreservation_sync(void *arg, dmu_tx_t *tx) 4460 { 4461 dsl_dataset_set_qr_arg_t *ddsqra = arg; 4462 dsl_pool_t *dp = dmu_tx_pool(tx); 4463 dsl_dataset_t *ds = NULL; 4464 4465 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds)); 4466 dsl_dataset_set_refreservation_sync_impl(ds, 4467 ddsqra->ddsqra_source, ddsqra->ddsqra_value, tx); 4468 dsl_dataset_rele(ds, FTAG); 4469 } 4470 4471 int 4472 dsl_dataset_set_refreservation(const char *dsname, zprop_source_t source, 4473 uint64_t refreservation) 4474 { 4475 dsl_dataset_set_qr_arg_t ddsqra; 4476 4477 ddsqra.ddsqra_name = dsname; 4478 ddsqra.ddsqra_source = source; 4479 ddsqra.ddsqra_value = refreservation; 4480 4481 return (dsl_sync_task(dsname, dsl_dataset_set_refreservation_check, 4482 dsl_dataset_set_refreservation_sync, &ddsqra, 0, 4483 ZFS_SPACE_CHECK_EXTRA_RESERVED)); 4484 } 4485 4486 typedef struct dsl_dataset_set_compression_arg { 4487 const char *ddsca_name; 4488 zprop_source_t ddsca_source; 4489 uint64_t ddsca_value; 4490 } dsl_dataset_set_compression_arg_t; 4491 4492 static int 4493 dsl_dataset_set_compression_check(void *arg, dmu_tx_t *tx) 4494 { 4495 dsl_dataset_set_compression_arg_t *ddsca = arg; 4496 dsl_pool_t *dp = dmu_tx_pool(tx); 4497 4498 uint64_t compval = ZIO_COMPRESS_ALGO(ddsca->ddsca_value); 4499 spa_feature_t f = zio_compress_to_feature(compval); 4500 4501 if (f == SPA_FEATURE_NONE) 4502 return (SET_ERROR(EINVAL)); 4503 4504 if (!spa_feature_is_enabled(dp->dp_spa, f)) 4505 return (SET_ERROR(ENOTSUP)); 4506 4507 return (0); 4508 } 4509 4510 static void 4511 dsl_dataset_set_compression_sync(void *arg, dmu_tx_t *tx) 4512 { 4513 dsl_dataset_set_compression_arg_t *ddsca = arg; 4514 dsl_pool_t *dp = dmu_tx_pool(tx); 4515 dsl_dataset_t *ds = NULL; 4516 4517 uint64_t compval = ZIO_COMPRESS_ALGO(ddsca->ddsca_value); 4518 spa_feature_t f = zio_compress_to_feature(compval); 4519 ASSERT3S(f, !=, SPA_FEATURE_NONE); 4520 ASSERT3S(spa_feature_table[f].fi_type, ==, ZFEATURE_TYPE_BOOLEAN); 4521 4522 VERIFY0(dsl_dataset_hold(dp, ddsca->ddsca_name, FTAG, &ds)); 4523 if (zfeature_active(f, ds->ds_feature[f]) != B_TRUE) { 4524 ds->ds_feature_activation[f] = (void *)B_TRUE; 4525 dsl_dataset_activate_feature(ds->ds_object, f, 4526 ds->ds_feature_activation[f], tx); 4527 ds->ds_feature[f] = ds->ds_feature_activation[f]; 4528 } 4529 dsl_dataset_rele(ds, FTAG); 4530 } 4531 4532 int 4533 dsl_dataset_set_compression(const char *dsname, zprop_source_t source, 4534 uint64_t compression) 4535 { 4536 dsl_dataset_set_compression_arg_t ddsca; 4537 4538 /* 4539 * The sync task is only required for zstd in order to activate 4540 * the feature flag when the property is first set. 4541 */ 4542 if (ZIO_COMPRESS_ALGO(compression) != ZIO_COMPRESS_ZSTD) 4543 return (0); 4544 4545 ddsca.ddsca_name = dsname; 4546 ddsca.ddsca_source = source; 4547 ddsca.ddsca_value = compression; 4548 4549 return (dsl_sync_task(dsname, dsl_dataset_set_compression_check, 4550 dsl_dataset_set_compression_sync, &ddsca, 0, 4551 ZFS_SPACE_CHECK_EXTRA_RESERVED)); 4552 } 4553 4554 /* 4555 * Return (in *usedp) the amount of space referenced by "new" that was not 4556 * referenced at the time the bookmark corresponds to. "New" may be a 4557 * snapshot or a head. The bookmark must be before new, in 4558 * new's filesystem (or its origin) -- caller verifies this. 4559 * 4560 * The written space is calculated by considering two components: First, we 4561 * ignore any freed space, and calculate the written as new's used space 4562 * minus old's used space. Next, we add in the amount of space that was freed 4563 * between the two time points, thus reducing new's used space relative to 4564 * old's. Specifically, this is the space that was born before 4565 * zbm_creation_txg, and freed before new (ie. on new's deadlist or a 4566 * previous deadlist). 4567 * 4568 * space freed [---------------------] 4569 * snapshots ---O-------O--------O-------O------ 4570 * bookmark new 4571 * 4572 * Note, the bookmark's zbm_*_bytes_refd must be valid, but if the HAS_FBN 4573 * flag is not set, we will calculate the freed_before_next based on the 4574 * next snapshot's deadlist, rather than using zbm_*_freed_before_next_snap. 4575 */ 4576 static int 4577 dsl_dataset_space_written_impl(zfs_bookmark_phys_t *bmp, 4578 dsl_dataset_t *new, uint64_t *usedp, uint64_t *compp, uint64_t *uncompp) 4579 { 4580 int err = 0; 4581 dsl_pool_t *dp = new->ds_dir->dd_pool; 4582 4583 ASSERT(dsl_pool_config_held(dp)); 4584 if (dsl_dataset_is_snapshot(new)) { 4585 ASSERT3U(bmp->zbm_creation_txg, <, 4586 dsl_dataset_phys(new)->ds_creation_txg); 4587 } 4588 4589 *usedp = 0; 4590 *usedp += dsl_dataset_phys(new)->ds_referenced_bytes; 4591 *usedp -= bmp->zbm_referenced_bytes_refd; 4592 4593 *compp = 0; 4594 *compp += dsl_dataset_phys(new)->ds_compressed_bytes; 4595 *compp -= bmp->zbm_compressed_bytes_refd; 4596 4597 *uncompp = 0; 4598 *uncompp += dsl_dataset_phys(new)->ds_uncompressed_bytes; 4599 *uncompp -= bmp->zbm_uncompressed_bytes_refd; 4600 4601 dsl_dataset_t *snap = new; 4602 4603 while (dsl_dataset_phys(snap)->ds_prev_snap_txg > 4604 bmp->zbm_creation_txg) { 4605 uint64_t used, comp, uncomp; 4606 4607 dsl_deadlist_space_range(&snap->ds_deadlist, 4608 0, bmp->zbm_creation_txg, 4609 &used, &comp, &uncomp); 4610 *usedp += used; 4611 *compp += comp; 4612 *uncompp += uncomp; 4613 4614 uint64_t snapobj = dsl_dataset_phys(snap)->ds_prev_snap_obj; 4615 if (snap != new) 4616 dsl_dataset_rele(snap, FTAG); 4617 err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &snap); 4618 if (err != 0) 4619 break; 4620 } 4621 4622 /* 4623 * We might not have the FBN if we are calculating written from 4624 * a snapshot (because we didn't know the correct "next" snapshot 4625 * until now). 4626 */ 4627 if (bmp->zbm_flags & ZBM_FLAG_HAS_FBN) { 4628 *usedp += bmp->zbm_referenced_freed_before_next_snap; 4629 *compp += bmp->zbm_compressed_freed_before_next_snap; 4630 *uncompp += bmp->zbm_uncompressed_freed_before_next_snap; 4631 } else { 4632 ASSERT3U(dsl_dataset_phys(snap)->ds_prev_snap_txg, ==, 4633 bmp->zbm_creation_txg); 4634 uint64_t used, comp, uncomp; 4635 dsl_deadlist_space(&snap->ds_deadlist, &used, &comp, &uncomp); 4636 *usedp += used; 4637 *compp += comp; 4638 *uncompp += uncomp; 4639 } 4640 if (snap != new) 4641 dsl_dataset_rele(snap, FTAG); 4642 return (err); 4643 } 4644 4645 /* 4646 * Return (in *usedp) the amount of space written in new that was not 4647 * present at the time the bookmark corresponds to. New may be a 4648 * snapshot or the head. Old must be a bookmark before new, in 4649 * new's filesystem (or its origin) -- caller verifies this. 4650 */ 4651 int 4652 dsl_dataset_space_written_bookmark(zfs_bookmark_phys_t *bmp, 4653 dsl_dataset_t *new, uint64_t *usedp, uint64_t *compp, uint64_t *uncompp) 4654 { 4655 if (!(bmp->zbm_flags & ZBM_FLAG_HAS_FBN)) 4656 return (SET_ERROR(ENOTSUP)); 4657 return (dsl_dataset_space_written_impl(bmp, new, 4658 usedp, compp, uncompp)); 4659 } 4660 4661 /* 4662 * Return (in *usedp) the amount of space written in new that is not 4663 * present in oldsnap. New may be a snapshot or the head. Old must be 4664 * a snapshot before new, in new's filesystem (or its origin). If not then 4665 * fail and return EINVAL. 4666 */ 4667 int 4668 dsl_dataset_space_written(dsl_dataset_t *oldsnap, dsl_dataset_t *new, 4669 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp) 4670 { 4671 if (!dsl_dataset_is_before(new, oldsnap, 0)) 4672 return (SET_ERROR(EINVAL)); 4673 4674 zfs_bookmark_phys_t zbm = { 0 }; 4675 dsl_dataset_phys_t *dsp = dsl_dataset_phys(oldsnap); 4676 zbm.zbm_guid = dsp->ds_guid; 4677 zbm.zbm_creation_txg = dsp->ds_creation_txg; 4678 zbm.zbm_creation_time = dsp->ds_creation_time; 4679 zbm.zbm_referenced_bytes_refd = dsp->ds_referenced_bytes; 4680 zbm.zbm_compressed_bytes_refd = dsp->ds_compressed_bytes; 4681 zbm.zbm_uncompressed_bytes_refd = dsp->ds_uncompressed_bytes; 4682 4683 /* 4684 * If oldsnap is the origin (or origin's origin, ...) of new, 4685 * we can't easily calculate the effective FBN. Therefore, 4686 * we do not set ZBM_FLAG_HAS_FBN, so that the _impl will calculate 4687 * it relative to the correct "next": the next snapshot towards "new", 4688 * rather than the next snapshot in oldsnap's dsl_dir. 4689 */ 4690 return (dsl_dataset_space_written_impl(&zbm, new, 4691 usedp, compp, uncompp)); 4692 } 4693 4694 /* 4695 * Return (in *usedp) the amount of space that will be reclaimed if firstsnap, 4696 * lastsnap, and all snapshots in between are deleted. 4697 * 4698 * blocks that would be freed [---------------------------] 4699 * snapshots ---O-------O--------O-------O--------O 4700 * firstsnap lastsnap 4701 * 4702 * This is the set of blocks that were born after the snap before firstsnap, 4703 * (birth > firstsnap->prev_snap_txg) and died before the snap after the 4704 * last snap (ie, is on lastsnap->ds_next->ds_deadlist or an earlier deadlist). 4705 * We calculate this by iterating over the relevant deadlists (from the snap 4706 * after lastsnap, backward to the snap after firstsnap), summing up the 4707 * space on the deadlist that was born after the snap before firstsnap. 4708 */ 4709 int 4710 dsl_dataset_space_wouldfree(dsl_dataset_t *firstsnap, 4711 dsl_dataset_t *lastsnap, 4712 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp) 4713 { 4714 int err = 0; 4715 uint64_t snapobj; 4716 dsl_pool_t *dp = firstsnap->ds_dir->dd_pool; 4717 4718 ASSERT(firstsnap->ds_is_snapshot); 4719 ASSERT(lastsnap->ds_is_snapshot); 4720 4721 /* 4722 * Check that the snapshots are in the same dsl_dir, and firstsnap 4723 * is before lastsnap. 4724 */ 4725 if (firstsnap->ds_dir != lastsnap->ds_dir || 4726 dsl_dataset_phys(firstsnap)->ds_creation_txg > 4727 dsl_dataset_phys(lastsnap)->ds_creation_txg) 4728 return (SET_ERROR(EINVAL)); 4729 4730 *usedp = *compp = *uncompp = 0; 4731 4732 snapobj = dsl_dataset_phys(lastsnap)->ds_next_snap_obj; 4733 while (snapobj != firstsnap->ds_object) { 4734 dsl_dataset_t *ds; 4735 uint64_t used, comp, uncomp; 4736 4737 err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &ds); 4738 if (err != 0) 4739 break; 4740 4741 dsl_deadlist_space_range(&ds->ds_deadlist, 4742 dsl_dataset_phys(firstsnap)->ds_prev_snap_txg, UINT64_MAX, 4743 &used, &comp, &uncomp); 4744 *usedp += used; 4745 *compp += comp; 4746 *uncompp += uncomp; 4747 4748 snapobj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 4749 ASSERT3U(snapobj, !=, 0); 4750 dsl_dataset_rele(ds, FTAG); 4751 } 4752 return (err); 4753 } 4754 4755 /* 4756 * Return TRUE if 'earlier' is an earlier snapshot in 'later's timeline. 4757 * For example, they could both be snapshots of the same filesystem, and 4758 * 'earlier' is before 'later'. Or 'earlier' could be the origin of 4759 * 'later's filesystem. Or 'earlier' could be an older snapshot in the origin's 4760 * filesystem. Or 'earlier' could be the origin's origin. 4761 * 4762 * If non-zero, earlier_txg is used instead of earlier's ds_creation_txg. 4763 */ 4764 boolean_t 4765 dsl_dataset_is_before(dsl_dataset_t *later, dsl_dataset_t *earlier, 4766 uint64_t earlier_txg) 4767 { 4768 dsl_pool_t *dp = later->ds_dir->dd_pool; 4769 int error; 4770 boolean_t ret; 4771 4772 ASSERT(dsl_pool_config_held(dp)); 4773 ASSERT(earlier->ds_is_snapshot || earlier_txg != 0); 4774 4775 if (earlier_txg == 0) 4776 earlier_txg = dsl_dataset_phys(earlier)->ds_creation_txg; 4777 4778 if (later->ds_is_snapshot && 4779 earlier_txg >= dsl_dataset_phys(later)->ds_creation_txg) 4780 return (B_FALSE); 4781 4782 if (later->ds_dir == earlier->ds_dir) 4783 return (B_TRUE); 4784 4785 /* 4786 * We check dd_origin_obj explicitly here rather than using 4787 * dsl_dir_is_clone() so that we will return TRUE if "earlier" 4788 * is $ORIGIN@$ORIGIN. dsl_dataset_space_written() depends on 4789 * this behavior. 4790 */ 4791 if (dsl_dir_phys(later->ds_dir)->dd_origin_obj == 0) 4792 return (B_FALSE); 4793 4794 dsl_dataset_t *origin; 4795 error = dsl_dataset_hold_obj(dp, 4796 dsl_dir_phys(later->ds_dir)->dd_origin_obj, FTAG, &origin); 4797 if (error != 0) 4798 return (B_FALSE); 4799 if (dsl_dataset_phys(origin)->ds_creation_txg == earlier_txg && 4800 origin->ds_dir == earlier->ds_dir) { 4801 dsl_dataset_rele(origin, FTAG); 4802 return (B_TRUE); 4803 } 4804 ret = dsl_dataset_is_before(origin, earlier, earlier_txg); 4805 dsl_dataset_rele(origin, FTAG); 4806 return (ret); 4807 } 4808 4809 void 4810 dsl_dataset_zapify(dsl_dataset_t *ds, dmu_tx_t *tx) 4811 { 4812 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 4813 dmu_object_zapify(mos, ds->ds_object, DMU_OT_DSL_DATASET, tx); 4814 } 4815 4816 boolean_t 4817 dsl_dataset_is_zapified(dsl_dataset_t *ds) 4818 { 4819 dmu_object_info_t doi; 4820 4821 dmu_object_info_from_db(ds->ds_dbuf, &doi); 4822 return (doi.doi_type == DMU_OTN_ZAP_METADATA); 4823 } 4824 4825 boolean_t 4826 dsl_dataset_has_resume_receive_state(dsl_dataset_t *ds) 4827 { 4828 return (dsl_dataset_is_zapified(ds) && 4829 zap_contains(ds->ds_dir->dd_pool->dp_meta_objset, 4830 ds->ds_object, DS_FIELD_RESUME_TOGUID) == 0); 4831 } 4832 4833 uint64_t 4834 dsl_dataset_get_remap_deadlist_object(dsl_dataset_t *ds) 4835 { 4836 uint64_t remap_deadlist_obj; 4837 int err; 4838 4839 if (!dsl_dataset_is_zapified(ds)) 4840 return (0); 4841 4842 err = zap_lookup(ds->ds_dir->dd_pool->dp_meta_objset, ds->ds_object, 4843 DS_FIELD_REMAP_DEADLIST, sizeof (remap_deadlist_obj), 1, 4844 &remap_deadlist_obj); 4845 4846 if (err != 0) { 4847 VERIFY3S(err, ==, ENOENT); 4848 return (0); 4849 } 4850 4851 ASSERT(remap_deadlist_obj != 0); 4852 return (remap_deadlist_obj); 4853 } 4854 4855 boolean_t 4856 dsl_dataset_remap_deadlist_exists(dsl_dataset_t *ds) 4857 { 4858 EQUIV(dsl_deadlist_is_open(&ds->ds_remap_deadlist), 4859 dsl_dataset_get_remap_deadlist_object(ds) != 0); 4860 return (dsl_deadlist_is_open(&ds->ds_remap_deadlist)); 4861 } 4862 4863 static void 4864 dsl_dataset_set_remap_deadlist_object(dsl_dataset_t *ds, uint64_t obj, 4865 dmu_tx_t *tx) 4866 { 4867 ASSERT(obj != 0); 4868 dsl_dataset_zapify(ds, tx); 4869 VERIFY0(zap_add(ds->ds_dir->dd_pool->dp_meta_objset, ds->ds_object, 4870 DS_FIELD_REMAP_DEADLIST, sizeof (obj), 1, &obj, tx)); 4871 } 4872 4873 static void 4874 dsl_dataset_unset_remap_deadlist_object(dsl_dataset_t *ds, dmu_tx_t *tx) 4875 { 4876 VERIFY0(zap_remove(ds->ds_dir->dd_pool->dp_meta_objset, 4877 ds->ds_object, DS_FIELD_REMAP_DEADLIST, tx)); 4878 } 4879 4880 void 4881 dsl_dataset_destroy_remap_deadlist(dsl_dataset_t *ds, dmu_tx_t *tx) 4882 { 4883 uint64_t remap_deadlist_object; 4884 spa_t *spa = ds->ds_dir->dd_pool->dp_spa; 4885 4886 ASSERT(dmu_tx_is_syncing(tx)); 4887 ASSERT(dsl_dataset_remap_deadlist_exists(ds)); 4888 4889 remap_deadlist_object = ds->ds_remap_deadlist.dl_object; 4890 dsl_deadlist_close(&ds->ds_remap_deadlist); 4891 dsl_deadlist_free(spa_meta_objset(spa), remap_deadlist_object, tx); 4892 dsl_dataset_unset_remap_deadlist_object(ds, tx); 4893 spa_feature_decr(spa, SPA_FEATURE_OBSOLETE_COUNTS, tx); 4894 } 4895 4896 void 4897 dsl_dataset_create_remap_deadlist(dsl_dataset_t *ds, dmu_tx_t *tx) 4898 { 4899 uint64_t remap_deadlist_obj; 4900 spa_t *spa = ds->ds_dir->dd_pool->dp_spa; 4901 4902 ASSERT(dmu_tx_is_syncing(tx)); 4903 ASSERT(MUTEX_HELD(&ds->ds_remap_deadlist_lock)); 4904 /* 4905 * Currently we only create remap deadlists when there are indirect 4906 * vdevs with referenced mappings. 4907 */ 4908 ASSERT(spa_feature_is_active(spa, SPA_FEATURE_DEVICE_REMOVAL)); 4909 4910 remap_deadlist_obj = dsl_deadlist_clone( 4911 &ds->ds_deadlist, UINT64_MAX, 4912 dsl_dataset_phys(ds)->ds_prev_snap_obj, tx); 4913 dsl_dataset_set_remap_deadlist_object(ds, 4914 remap_deadlist_obj, tx); 4915 dsl_deadlist_open(&ds->ds_remap_deadlist, spa_meta_objset(spa), 4916 remap_deadlist_obj); 4917 spa_feature_incr(spa, SPA_FEATURE_OBSOLETE_COUNTS, tx); 4918 } 4919 4920 void 4921 dsl_dataset_activate_redaction(dsl_dataset_t *ds, uint64_t *redact_snaps, 4922 uint64_t num_redact_snaps, dmu_tx_t *tx) 4923 { 4924 uint64_t dsobj = ds->ds_object; 4925 struct feature_type_uint64_array_arg *ftuaa = 4926 kmem_zalloc(sizeof (*ftuaa), KM_SLEEP); 4927 ftuaa->length = (int64_t)num_redact_snaps; 4928 if (num_redact_snaps > 0) { 4929 ftuaa->array = kmem_alloc(num_redact_snaps * sizeof (uint64_t), 4930 KM_SLEEP); 4931 memcpy(ftuaa->array, redact_snaps, num_redact_snaps * 4932 sizeof (uint64_t)); 4933 } 4934 dsl_dataset_activate_feature(dsobj, SPA_FEATURE_REDACTED_DATASETS, 4935 ftuaa, tx); 4936 ds->ds_feature[SPA_FEATURE_REDACTED_DATASETS] = ftuaa; 4937 } 4938 4939 /* 4940 * Find and return (in *oldest_dsobj) the oldest snapshot of the dsobj 4941 * dataset whose birth time is >= min_txg. 4942 */ 4943 int 4944 dsl_dataset_oldest_snapshot(spa_t *spa, uint64_t head_ds, uint64_t min_txg, 4945 uint64_t *oldest_dsobj) 4946 { 4947 dsl_dataset_t *ds; 4948 dsl_pool_t *dp = spa->spa_dsl_pool; 4949 4950 int error = dsl_dataset_hold_obj(dp, head_ds, FTAG, &ds); 4951 if (error != 0) 4952 return (error); 4953 4954 uint64_t prev_obj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 4955 uint64_t prev_obj_txg = dsl_dataset_phys(ds)->ds_prev_snap_txg; 4956 4957 while (prev_obj != 0 && min_txg < prev_obj_txg) { 4958 dsl_dataset_rele(ds, FTAG); 4959 if ((error = dsl_dataset_hold_obj(dp, prev_obj, 4960 FTAG, &ds)) != 0) 4961 return (error); 4962 prev_obj_txg = dsl_dataset_phys(ds)->ds_prev_snap_txg; 4963 prev_obj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 4964 } 4965 *oldest_dsobj = ds->ds_object; 4966 dsl_dataset_rele(ds, FTAG); 4967 return (0); 4968 } 4969 4970 ZFS_MODULE_PARAM(zfs, zfs_, max_recordsize, UINT, ZMOD_RW, 4971 "Max allowed record size"); 4972 4973 ZFS_MODULE_PARAM(zfs, zfs_, allow_redacted_dataset_mount, INT, ZMOD_RW, 4974 "Allow mounting of redacted datasets"); 4975 4976 ZFS_MODULE_PARAM(zfs, zfs_, snapshot_history_enabled, INT, ZMOD_RW, 4977 "Include snapshot events in pool history/events"); 4978 4979 EXPORT_SYMBOL(dsl_dataset_hold); 4980 EXPORT_SYMBOL(dsl_dataset_hold_flags); 4981 EXPORT_SYMBOL(dsl_dataset_hold_obj); 4982 EXPORT_SYMBOL(dsl_dataset_hold_obj_flags); 4983 EXPORT_SYMBOL(dsl_dataset_own); 4984 EXPORT_SYMBOL(dsl_dataset_own_obj); 4985 EXPORT_SYMBOL(dsl_dataset_name); 4986 EXPORT_SYMBOL(dsl_dataset_rele); 4987 EXPORT_SYMBOL(dsl_dataset_rele_flags); 4988 EXPORT_SYMBOL(dsl_dataset_disown); 4989 EXPORT_SYMBOL(dsl_dataset_tryown); 4990 EXPORT_SYMBOL(dsl_dataset_create_sync); 4991 EXPORT_SYMBOL(dsl_dataset_create_sync_dd); 4992 EXPORT_SYMBOL(dsl_dataset_snapshot_check); 4993 EXPORT_SYMBOL(dsl_dataset_snapshot_sync); 4994 EXPORT_SYMBOL(dsl_dataset_promote); 4995 EXPORT_SYMBOL(dsl_dataset_user_hold); 4996 EXPORT_SYMBOL(dsl_dataset_user_release); 4997 EXPORT_SYMBOL(dsl_dataset_get_holds); 4998 EXPORT_SYMBOL(dsl_dataset_get_blkptr); 4999 EXPORT_SYMBOL(dsl_dataset_get_spa); 5000 EXPORT_SYMBOL(dsl_dataset_modified_since_snap); 5001 EXPORT_SYMBOL(dsl_dataset_space_written); 5002 EXPORT_SYMBOL(dsl_dataset_space_wouldfree); 5003 EXPORT_SYMBOL(dsl_dataset_sync); 5004 EXPORT_SYMBOL(dsl_dataset_block_born); 5005 EXPORT_SYMBOL(dsl_dataset_block_kill); 5006 EXPORT_SYMBOL(dsl_dataset_dirty); 5007 EXPORT_SYMBOL(dsl_dataset_stats); 5008 EXPORT_SYMBOL(dsl_dataset_fast_stat); 5009 EXPORT_SYMBOL(dsl_dataset_space); 5010 EXPORT_SYMBOL(dsl_dataset_fsid_guid); 5011 EXPORT_SYMBOL(dsl_dsobj_to_dsname); 5012 EXPORT_SYMBOL(dsl_dataset_check_quota); 5013 EXPORT_SYMBOL(dsl_dataset_clone_swap_check_impl); 5014 EXPORT_SYMBOL(dsl_dataset_clone_swap_sync_impl); 5015