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 1276 /* dsl_dataset_sync_done will drop this reference. */ 1277 dmu_buf_add_ref(ds->ds_dbuf, ds); 1278 dsl_dataset_sync_done(ds, tx); 1279 } 1280 } 1281 1282 uint64_t 1283 dsl_dataset_create_sync(dsl_dir_t *pdd, const char *lastname, 1284 dsl_dataset_t *origin, uint64_t flags, cred_t *cr, 1285 dsl_crypto_params_t *dcp, dmu_tx_t *tx) 1286 { 1287 dsl_pool_t *dp = pdd->dd_pool; 1288 uint64_t dsobj, ddobj; 1289 dsl_dir_t *dd; 1290 1291 ASSERT(dmu_tx_is_syncing(tx)); 1292 ASSERT(lastname[0] != '@'); 1293 /* 1294 * Filesystems will eventually have their origin set to dp_origin_snap, 1295 * but that's taken care of in dsl_dataset_create_sync_dd. When 1296 * creating a filesystem, this function is called with origin equal to 1297 * NULL. 1298 */ 1299 if (origin != NULL) 1300 ASSERT3P(origin, !=, dp->dp_origin_snap); 1301 1302 ddobj = dsl_dir_create_sync(dp, pdd, lastname, tx); 1303 VERIFY0(dsl_dir_hold_obj(dp, ddobj, lastname, FTAG, &dd)); 1304 1305 dsobj = dsl_dataset_create_sync_dd(dd, origin, dcp, 1306 flags & ~DS_CREATE_FLAG_NODIRTY, tx); 1307 1308 dsl_deleg_set_create_perms(dd, tx, cr); 1309 1310 /* 1311 * If we are creating a clone and the livelist feature is enabled, 1312 * add the entry DD_FIELD_LIVELIST to ZAP. 1313 */ 1314 if (origin != NULL && 1315 spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_LIVELIST)) { 1316 objset_t *mos = dd->dd_pool->dp_meta_objset; 1317 dsl_dir_zapify(dd, tx); 1318 uint64_t obj = dsl_deadlist_alloc(mos, tx); 1319 VERIFY0(zap_add(mos, dd->dd_object, DD_FIELD_LIVELIST, 1320 sizeof (uint64_t), 1, &obj, tx)); 1321 spa_feature_incr(dp->dp_spa, SPA_FEATURE_LIVELIST, tx); 1322 } 1323 1324 /* 1325 * Since we're creating a new node we know it's a leaf, so we can 1326 * initialize the counts if the limit feature is active. 1327 */ 1328 if (spa_feature_is_active(dp->dp_spa, SPA_FEATURE_FS_SS_LIMIT)) { 1329 uint64_t cnt = 0; 1330 objset_t *os = dd->dd_pool->dp_meta_objset; 1331 1332 dsl_dir_zapify(dd, tx); 1333 VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_FILESYSTEM_COUNT, 1334 sizeof (cnt), 1, &cnt, tx)); 1335 VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_SNAPSHOT_COUNT, 1336 sizeof (cnt), 1, &cnt, tx)); 1337 } 1338 1339 dsl_dir_rele(dd, FTAG); 1340 1341 /* 1342 * If we are creating a clone, make sure we zero out any stale 1343 * data from the origin snapshots zil header. 1344 */ 1345 if (origin != NULL && !(flags & DS_CREATE_FLAG_NODIRTY)) { 1346 dsl_dataset_t *ds; 1347 1348 VERIFY0(dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds)); 1349 dsl_dataset_zero_zil(ds, tx); 1350 dsl_dataset_rele(ds, FTAG); 1351 } 1352 1353 return (dsobj); 1354 } 1355 1356 /* 1357 * The unique space in the head dataset can be calculated by subtracting 1358 * the space used in the most recent snapshot, that is still being used 1359 * in this file system, from the space currently in use. To figure out 1360 * the space in the most recent snapshot still in use, we need to take 1361 * the total space used in the snapshot and subtract out the space that 1362 * has been freed up since the snapshot was taken. 1363 */ 1364 void 1365 dsl_dataset_recalc_head_uniq(dsl_dataset_t *ds) 1366 { 1367 uint64_t mrs_used; 1368 uint64_t dlused, dlcomp, dluncomp; 1369 1370 ASSERT(!ds->ds_is_snapshot); 1371 1372 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) 1373 mrs_used = dsl_dataset_phys(ds->ds_prev)->ds_referenced_bytes; 1374 else 1375 mrs_used = 0; 1376 1377 dsl_deadlist_space(&ds->ds_deadlist, &dlused, &dlcomp, &dluncomp); 1378 1379 ASSERT3U(dlused, <=, mrs_used); 1380 dsl_dataset_phys(ds)->ds_unique_bytes = 1381 dsl_dataset_phys(ds)->ds_referenced_bytes - (mrs_used - dlused); 1382 1383 if (spa_version(ds->ds_dir->dd_pool->dp_spa) >= 1384 SPA_VERSION_UNIQUE_ACCURATE) 1385 dsl_dataset_phys(ds)->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 1386 } 1387 1388 void 1389 dsl_dataset_remove_from_next_clones(dsl_dataset_t *ds, uint64_t obj, 1390 dmu_tx_t *tx) 1391 { 1392 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 1393 uint64_t count __maybe_unused; 1394 int err; 1395 1396 ASSERT(dsl_dataset_phys(ds)->ds_num_children >= 2); 1397 err = zap_remove_int(mos, dsl_dataset_phys(ds)->ds_next_clones_obj, 1398 obj, tx); 1399 /* 1400 * The err should not be ENOENT, but a bug in a previous version 1401 * of the code could cause upgrade_clones_cb() to not set 1402 * ds_next_snap_obj when it should, leading to a missing entry. 1403 * If we knew that the pool was created after 1404 * SPA_VERSION_NEXT_CLONES, we could assert that it isn't 1405 * ENOENT. However, at least we can check that we don't have 1406 * too many entries in the next_clones_obj even after failing to 1407 * remove this one. 1408 */ 1409 if (err != ENOENT) 1410 VERIFY0(err); 1411 ASSERT0(zap_count(mos, dsl_dataset_phys(ds)->ds_next_clones_obj, 1412 &count)); 1413 ASSERT3U(count, <=, dsl_dataset_phys(ds)->ds_num_children - 2); 1414 } 1415 1416 1417 blkptr_t * 1418 dsl_dataset_get_blkptr(dsl_dataset_t *ds) 1419 { 1420 return (&dsl_dataset_phys(ds)->ds_bp); 1421 } 1422 1423 spa_t * 1424 dsl_dataset_get_spa(dsl_dataset_t *ds) 1425 { 1426 return (ds->ds_dir->dd_pool->dp_spa); 1427 } 1428 1429 void 1430 dsl_dataset_dirty(dsl_dataset_t *ds, dmu_tx_t *tx) 1431 { 1432 dsl_pool_t *dp; 1433 1434 if (ds == NULL) /* this is the meta-objset */ 1435 return; 1436 1437 ASSERT(ds->ds_objset != NULL); 1438 1439 if (dsl_dataset_phys(ds)->ds_next_snap_obj != 0) 1440 panic("dirtying snapshot!"); 1441 1442 /* Must not dirty a dataset in the same txg where it got snapshotted. */ 1443 ASSERT3U(tx->tx_txg, >, dsl_dataset_phys(ds)->ds_prev_snap_txg); 1444 1445 dp = ds->ds_dir->dd_pool; 1446 if (txg_list_add(&dp->dp_dirty_datasets, ds, tx->tx_txg)) { 1447 objset_t *os = ds->ds_objset; 1448 1449 /* up the hold count until we can be written out */ 1450 dmu_buf_add_ref(ds->ds_dbuf, ds); 1451 1452 /* if this dataset is encrypted, grab a reference to the DCK */ 1453 if (ds->ds_dir->dd_crypto_obj != 0 && 1454 !os->os_raw_receive && 1455 !os->os_next_write_raw[tx->tx_txg & TXG_MASK]) { 1456 ASSERT3P(ds->ds_key_mapping, !=, NULL); 1457 key_mapping_add_ref(ds->ds_key_mapping, ds); 1458 } 1459 } 1460 } 1461 1462 static int 1463 dsl_dataset_snapshot_reserve_space(dsl_dataset_t *ds, dmu_tx_t *tx) 1464 { 1465 uint64_t asize; 1466 1467 if (!dmu_tx_is_syncing(tx)) 1468 return (0); 1469 1470 /* 1471 * If there's an fs-only reservation, any blocks that might become 1472 * owned by the snapshot dataset must be accommodated by space 1473 * outside of the reservation. 1474 */ 1475 ASSERT(ds->ds_reserved == 0 || DS_UNIQUE_IS_ACCURATE(ds)); 1476 asize = MIN(dsl_dataset_phys(ds)->ds_unique_bytes, ds->ds_reserved); 1477 if (asize > dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE)) 1478 return (SET_ERROR(ENOSPC)); 1479 1480 /* 1481 * Propagate any reserved space for this snapshot to other 1482 * snapshot checks in this sync group. 1483 */ 1484 if (asize > 0) 1485 dsl_dir_willuse_space(ds->ds_dir, asize, tx); 1486 1487 return (0); 1488 } 1489 1490 int 1491 dsl_dataset_snapshot_check_impl(dsl_dataset_t *ds, const char *snapname, 1492 dmu_tx_t *tx, boolean_t recv, uint64_t cnt, cred_t *cr, proc_t *proc) 1493 { 1494 int error; 1495 uint64_t value; 1496 1497 ds->ds_trysnap_txg = tx->tx_txg; 1498 1499 if (!dmu_tx_is_syncing(tx)) 1500 return (0); 1501 1502 /* 1503 * We don't allow multiple snapshots of the same txg. If there 1504 * is already one, try again. 1505 */ 1506 if (dsl_dataset_phys(ds)->ds_prev_snap_txg >= tx->tx_txg) 1507 return (SET_ERROR(EAGAIN)); 1508 1509 /* 1510 * Check for conflicting snapshot name. 1511 */ 1512 error = dsl_dataset_snap_lookup(ds, snapname, &value); 1513 if (error == 0) 1514 return (SET_ERROR(EEXIST)); 1515 if (error != ENOENT) 1516 return (error); 1517 1518 /* 1519 * We don't allow taking snapshots of inconsistent datasets, such as 1520 * those into which we are currently receiving. However, if we are 1521 * creating this snapshot as part of a receive, this check will be 1522 * executed atomically with respect to the completion of the receive 1523 * itself but prior to the clearing of DS_FLAG_INCONSISTENT; in this 1524 * case we ignore this, knowing it will be fixed up for us shortly in 1525 * dmu_recv_end_sync(). 1526 */ 1527 if (!recv && DS_IS_INCONSISTENT(ds)) 1528 return (SET_ERROR(EBUSY)); 1529 1530 /* 1531 * Skip the check for temporary snapshots or if we have already checked 1532 * the counts in dsl_dataset_snapshot_check. This means we really only 1533 * check the count here when we're receiving a stream. 1534 */ 1535 if (cnt != 0 && cr != NULL) { 1536 error = dsl_fs_ss_limit_check(ds->ds_dir, cnt, 1537 ZFS_PROP_SNAPSHOT_LIMIT, NULL, cr, proc); 1538 if (error != 0) 1539 return (error); 1540 } 1541 1542 error = dsl_dataset_snapshot_reserve_space(ds, tx); 1543 if (error != 0) 1544 return (error); 1545 1546 return (0); 1547 } 1548 1549 int 1550 dsl_dataset_snapshot_check(void *arg, dmu_tx_t *tx) 1551 { 1552 dsl_dataset_snapshot_arg_t *ddsa = arg; 1553 dsl_pool_t *dp = dmu_tx_pool(tx); 1554 nvpair_t *pair; 1555 int rv = 0; 1556 1557 /* 1558 * Pre-compute how many total new snapshots will be created for each 1559 * level in the tree and below. This is needed for validating the 1560 * snapshot limit when either taking a recursive snapshot or when 1561 * taking multiple snapshots. 1562 * 1563 * The problem is that the counts are not actually adjusted when 1564 * we are checking, only when we finally sync. For a single snapshot, 1565 * this is easy, the count will increase by 1 at each node up the tree, 1566 * but its more complicated for the recursive/multiple snapshot case. 1567 * 1568 * The dsl_fs_ss_limit_check function does recursively check the count 1569 * at each level up the tree but since it is validating each snapshot 1570 * independently we need to be sure that we are validating the complete 1571 * count for the entire set of snapshots. We do this by rolling up the 1572 * counts for each component of the name into an nvlist and then 1573 * checking each of those cases with the aggregated count. 1574 * 1575 * This approach properly handles not only the recursive snapshot 1576 * case (where we get all of those on the ddsa_snaps list) but also 1577 * the sibling case (e.g. snapshot a/b and a/c so that we will also 1578 * validate the limit on 'a' using a count of 2). 1579 * 1580 * We validate the snapshot names in the third loop and only report 1581 * name errors once. 1582 */ 1583 if (dmu_tx_is_syncing(tx)) { 1584 char *nm; 1585 nvlist_t *cnt_track = NULL; 1586 cnt_track = fnvlist_alloc(); 1587 1588 nm = kmem_alloc(MAXPATHLEN, KM_SLEEP); 1589 1590 /* Rollup aggregated counts into the cnt_track list */ 1591 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL); 1592 pair != NULL; 1593 pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) { 1594 char *pdelim; 1595 uint64_t val; 1596 1597 (void) strlcpy(nm, nvpair_name(pair), MAXPATHLEN); 1598 pdelim = strchr(nm, '@'); 1599 if (pdelim == NULL) 1600 continue; 1601 *pdelim = '\0'; 1602 1603 do { 1604 if (nvlist_lookup_uint64(cnt_track, nm, 1605 &val) == 0) { 1606 /* update existing entry */ 1607 fnvlist_add_uint64(cnt_track, nm, 1608 val + 1); 1609 } else { 1610 /* add to list */ 1611 fnvlist_add_uint64(cnt_track, nm, 1); 1612 } 1613 1614 pdelim = strrchr(nm, '/'); 1615 if (pdelim != NULL) 1616 *pdelim = '\0'; 1617 } while (pdelim != NULL); 1618 } 1619 1620 kmem_free(nm, MAXPATHLEN); 1621 1622 /* Check aggregated counts at each level */ 1623 for (pair = nvlist_next_nvpair(cnt_track, NULL); 1624 pair != NULL; pair = nvlist_next_nvpair(cnt_track, pair)) { 1625 int error = 0; 1626 char *name; 1627 uint64_t cnt = 0; 1628 dsl_dataset_t *ds; 1629 1630 name = nvpair_name(pair); 1631 cnt = fnvpair_value_uint64(pair); 1632 ASSERT(cnt > 0); 1633 1634 error = dsl_dataset_hold(dp, name, FTAG, &ds); 1635 if (error == 0) { 1636 error = dsl_fs_ss_limit_check(ds->ds_dir, cnt, 1637 ZFS_PROP_SNAPSHOT_LIMIT, NULL, 1638 ddsa->ddsa_cr, ddsa->ddsa_proc); 1639 dsl_dataset_rele(ds, FTAG); 1640 } 1641 1642 if (error != 0) { 1643 if (ddsa->ddsa_errors != NULL) 1644 fnvlist_add_int32(ddsa->ddsa_errors, 1645 name, error); 1646 rv = error; 1647 /* only report one error for this check */ 1648 break; 1649 } 1650 } 1651 nvlist_free(cnt_track); 1652 } 1653 1654 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL); 1655 pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) { 1656 int error = 0; 1657 dsl_dataset_t *ds; 1658 char *name, *atp = NULL; 1659 char dsname[ZFS_MAX_DATASET_NAME_LEN]; 1660 1661 name = nvpair_name(pair); 1662 if (strlen(name) >= ZFS_MAX_DATASET_NAME_LEN) 1663 error = SET_ERROR(ENAMETOOLONG); 1664 if (error == 0) { 1665 atp = strchr(name, '@'); 1666 if (atp == NULL) 1667 error = SET_ERROR(EINVAL); 1668 if (error == 0) 1669 (void) strlcpy(dsname, name, atp - name + 1); 1670 } 1671 if (error == 0) 1672 error = dsl_dataset_hold(dp, dsname, FTAG, &ds); 1673 if (error == 0) { 1674 /* passing 0/NULL skips dsl_fs_ss_limit_check */ 1675 error = dsl_dataset_snapshot_check_impl(ds, 1676 atp + 1, tx, B_FALSE, 0, NULL, NULL); 1677 dsl_dataset_rele(ds, FTAG); 1678 } 1679 1680 if (error != 0) { 1681 if (ddsa->ddsa_errors != NULL) { 1682 fnvlist_add_int32(ddsa->ddsa_errors, 1683 name, error); 1684 } 1685 rv = error; 1686 } 1687 } 1688 1689 return (rv); 1690 } 1691 1692 void 1693 dsl_dataset_snapshot_sync_impl(dsl_dataset_t *ds, const char *snapname, 1694 dmu_tx_t *tx) 1695 { 1696 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1697 dmu_buf_t *dbuf; 1698 dsl_dataset_phys_t *dsphys; 1699 uint64_t dsobj, crtxg; 1700 objset_t *mos = dp->dp_meta_objset; 1701 objset_t *os __maybe_unused; 1702 1703 ASSERT(RRW_WRITE_HELD(&dp->dp_config_rwlock)); 1704 1705 /* 1706 * If we are on an old pool, the zil must not be active, in which 1707 * case it will be zeroed. Usually zil_suspend() accomplishes this. 1708 */ 1709 ASSERT(spa_version(dmu_tx_pool(tx)->dp_spa) >= SPA_VERSION_FAST_SNAP || 1710 dmu_objset_from_ds(ds, &os) != 0 || 1711 memcmp(&os->os_phys->os_zil_header, &zero_zil, 1712 sizeof (zero_zil)) == 0); 1713 1714 /* Should not snapshot a dirty dataset. */ 1715 ASSERT(!txg_list_member(&ds->ds_dir->dd_pool->dp_dirty_datasets, 1716 ds, tx->tx_txg)); 1717 1718 dsl_fs_ss_count_adjust(ds->ds_dir, 1, DD_FIELD_SNAPSHOT_COUNT, tx); 1719 1720 /* 1721 * The origin's ds_creation_txg has to be < TXG_INITIAL 1722 */ 1723 if (strcmp(snapname, ORIGIN_DIR_NAME) == 0) 1724 crtxg = 1; 1725 else 1726 crtxg = tx->tx_txg; 1727 1728 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, 1729 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); 1730 VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); 1731 dmu_buf_will_dirty(dbuf, tx); 1732 dsphys = dbuf->db_data; 1733 memset(dsphys, 0, sizeof (dsl_dataset_phys_t)); 1734 dsphys->ds_dir_obj = ds->ds_dir->dd_object; 1735 dsphys->ds_fsid_guid = unique_create(); 1736 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, 1737 sizeof (dsphys->ds_guid)); 1738 dsphys->ds_prev_snap_obj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 1739 dsphys->ds_prev_snap_txg = dsl_dataset_phys(ds)->ds_prev_snap_txg; 1740 dsphys->ds_next_snap_obj = ds->ds_object; 1741 dsphys->ds_num_children = 1; 1742 dsphys->ds_creation_time = gethrestime_sec(); 1743 dsphys->ds_creation_txg = crtxg; 1744 dsphys->ds_deadlist_obj = dsl_dataset_phys(ds)->ds_deadlist_obj; 1745 dsphys->ds_referenced_bytes = dsl_dataset_phys(ds)->ds_referenced_bytes; 1746 dsphys->ds_compressed_bytes = dsl_dataset_phys(ds)->ds_compressed_bytes; 1747 dsphys->ds_uncompressed_bytes = 1748 dsl_dataset_phys(ds)->ds_uncompressed_bytes; 1749 dsphys->ds_flags = dsl_dataset_phys(ds)->ds_flags; 1750 rrw_enter(&ds->ds_bp_rwlock, RW_READER, FTAG); 1751 dsphys->ds_bp = dsl_dataset_phys(ds)->ds_bp; 1752 rrw_exit(&ds->ds_bp_rwlock, FTAG); 1753 dmu_buf_rele(dbuf, FTAG); 1754 1755 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 1756 if (zfeature_active(f, ds->ds_feature[f])) { 1757 dsl_dataset_activate_feature(dsobj, f, 1758 ds->ds_feature[f], tx); 1759 } 1760 } 1761 1762 /* 1763 * We are not allowed to dirty a filesystem when done receiving 1764 * a snapshot. In this case some flags such as SPA_FEATURE_LARGE_BLOCKS 1765 * will not be set and a subsequent encrypted raw send will fail. Hence 1766 * activate this feature if needed here. This needs to happen only in 1767 * syncing context. 1768 */ 1769 if (dmu_tx_is_syncing(tx)) { 1770 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 1771 if (zfeature_active(f, ds->ds_feature_activation[f]) && 1772 !(zfeature_active(f, ds->ds_feature[f]))) { 1773 dsl_dataset_activate_feature(dsobj, f, 1774 ds->ds_feature_activation[f], tx); 1775 ds->ds_feature[f] = 1776 ds->ds_feature_activation[f]; 1777 } 1778 } 1779 } 1780 1781 ASSERT3U(ds->ds_prev != 0, ==, 1782 dsl_dataset_phys(ds)->ds_prev_snap_obj != 0); 1783 if (ds->ds_prev) { 1784 uint64_t next_clones_obj = 1785 dsl_dataset_phys(ds->ds_prev)->ds_next_clones_obj; 1786 ASSERT(dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj == 1787 ds->ds_object || 1788 dsl_dataset_phys(ds->ds_prev)->ds_num_children > 1); 1789 if (dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj == 1790 ds->ds_object) { 1791 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); 1792 ASSERT3U(dsl_dataset_phys(ds)->ds_prev_snap_txg, ==, 1793 dsl_dataset_phys(ds->ds_prev)->ds_creation_txg); 1794 dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj = dsobj; 1795 } else if (next_clones_obj != 0) { 1796 dsl_dataset_remove_from_next_clones(ds->ds_prev, 1797 dsphys->ds_next_snap_obj, tx); 1798 VERIFY0(zap_add_int(mos, 1799 next_clones_obj, dsobj, tx)); 1800 } 1801 } 1802 1803 /* 1804 * If we have a reference-reservation on this dataset, we will 1805 * need to increase the amount of refreservation being charged 1806 * since our unique space is going to zero. 1807 */ 1808 if (ds->ds_reserved) { 1809 int64_t delta; 1810 ASSERT(DS_UNIQUE_IS_ACCURATE(ds)); 1811 delta = MIN(dsl_dataset_phys(ds)->ds_unique_bytes, 1812 ds->ds_reserved); 1813 dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV, 1814 delta, 0, 0, tx); 1815 } 1816 1817 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1818 dsl_dataset_phys(ds)->ds_deadlist_obj = 1819 dsl_deadlist_clone(&ds->ds_deadlist, UINT64_MAX, 1820 dsl_dataset_phys(ds)->ds_prev_snap_obj, tx); 1821 dsl_deadlist_close(&ds->ds_deadlist); 1822 dsl_deadlist_open(&ds->ds_deadlist, mos, 1823 dsl_dataset_phys(ds)->ds_deadlist_obj); 1824 dsl_deadlist_add_key(&ds->ds_deadlist, 1825 dsl_dataset_phys(ds)->ds_prev_snap_txg, tx); 1826 dsl_bookmark_snapshotted(ds, tx); 1827 1828 if (dsl_dataset_remap_deadlist_exists(ds)) { 1829 uint64_t remap_deadlist_obj = 1830 dsl_dataset_get_remap_deadlist_object(ds); 1831 /* 1832 * Move the remap_deadlist to the snapshot. The head 1833 * will create a new remap deadlist on demand, from 1834 * dsl_dataset_block_remapped(). 1835 */ 1836 dsl_dataset_unset_remap_deadlist_object(ds, tx); 1837 dsl_deadlist_close(&ds->ds_remap_deadlist); 1838 1839 dmu_object_zapify(mos, dsobj, DMU_OT_DSL_DATASET, tx); 1840 VERIFY0(zap_add(mos, dsobj, DS_FIELD_REMAP_DEADLIST, 1841 sizeof (remap_deadlist_obj), 1, &remap_deadlist_obj, tx)); 1842 } 1843 1844 /* 1845 * Create a ivset guid for this snapshot if the dataset is 1846 * encrypted. This may be overridden by a raw receive. A 1847 * previous implementation of this code did not have this 1848 * field as part of the on-disk format for ZFS encryption 1849 * (see errata #4). As part of the remediation for this 1850 * issue, we ask the user to enable the bookmark_v2 feature 1851 * which is now a dependency of the encryption feature. We 1852 * use this as a heuristic to determine when the user has 1853 * elected to correct any datasets created with the old code. 1854 * As a result, we only do this step if the bookmark_v2 1855 * feature is enabled, which limits the number of states a 1856 * given pool / dataset can be in with regards to terms of 1857 * correcting the issue. 1858 */ 1859 if (ds->ds_dir->dd_crypto_obj != 0 && 1860 spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_BOOKMARK_V2)) { 1861 uint64_t ivset_guid = unique_create(); 1862 1863 dmu_object_zapify(mos, dsobj, DMU_OT_DSL_DATASET, tx); 1864 VERIFY0(zap_add(mos, dsobj, DS_FIELD_IVSET_GUID, 1865 sizeof (ivset_guid), 1, &ivset_guid, tx)); 1866 } 1867 1868 ASSERT3U(dsl_dataset_phys(ds)->ds_prev_snap_txg, <, tx->tx_txg); 1869 dsl_dataset_phys(ds)->ds_prev_snap_obj = dsobj; 1870 dsl_dataset_phys(ds)->ds_prev_snap_txg = crtxg; 1871 dsl_dataset_phys(ds)->ds_unique_bytes = 0; 1872 1873 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE) 1874 dsl_dataset_phys(ds)->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 1875 1876 VERIFY0(zap_add(mos, dsl_dataset_phys(ds)->ds_snapnames_zapobj, 1877 snapname, 8, 1, &dsobj, tx)); 1878 1879 if (ds->ds_prev) 1880 dsl_dataset_rele(ds->ds_prev, ds); 1881 VERIFY0(dsl_dataset_hold_obj(dp, 1882 dsl_dataset_phys(ds)->ds_prev_snap_obj, ds, &ds->ds_prev)); 1883 1884 dsl_scan_ds_snapshotted(ds, tx); 1885 1886 dsl_dir_snap_cmtime_update(ds->ds_dir, tx); 1887 1888 if (zfs_snapshot_history_enabled) 1889 spa_history_log_internal_ds(ds->ds_prev, "snapshot", tx, " "); 1890 } 1891 1892 void 1893 dsl_dataset_snapshot_sync(void *arg, dmu_tx_t *tx) 1894 { 1895 dsl_dataset_snapshot_arg_t *ddsa = arg; 1896 dsl_pool_t *dp = dmu_tx_pool(tx); 1897 nvpair_t *pair; 1898 1899 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL); 1900 pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) { 1901 dsl_dataset_t *ds; 1902 char *name, *atp; 1903 char dsname[ZFS_MAX_DATASET_NAME_LEN]; 1904 1905 name = nvpair_name(pair); 1906 atp = strchr(name, '@'); 1907 (void) strlcpy(dsname, name, atp - name + 1); 1908 VERIFY0(dsl_dataset_hold(dp, dsname, FTAG, &ds)); 1909 1910 dsl_dataset_snapshot_sync_impl(ds, atp + 1, tx); 1911 if (ddsa->ddsa_props != NULL) { 1912 dsl_props_set_sync_impl(ds->ds_prev, 1913 ZPROP_SRC_LOCAL, ddsa->ddsa_props, tx); 1914 } 1915 dsl_dataset_rele(ds, FTAG); 1916 } 1917 } 1918 1919 /* 1920 * The snapshots must all be in the same pool. 1921 * All-or-nothing: if there are any failures, nothing will be modified. 1922 */ 1923 int 1924 dsl_dataset_snapshot(nvlist_t *snaps, nvlist_t *props, nvlist_t *errors) 1925 { 1926 dsl_dataset_snapshot_arg_t ddsa; 1927 nvpair_t *pair; 1928 boolean_t needsuspend; 1929 int error; 1930 spa_t *spa; 1931 char *firstname; 1932 nvlist_t *suspended = NULL; 1933 1934 pair = nvlist_next_nvpair(snaps, NULL); 1935 if (pair == NULL) 1936 return (0); 1937 firstname = nvpair_name(pair); 1938 1939 error = spa_open(firstname, &spa, FTAG); 1940 if (error != 0) 1941 return (error); 1942 needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP); 1943 spa_close(spa, FTAG); 1944 1945 if (needsuspend) { 1946 suspended = fnvlist_alloc(); 1947 for (pair = nvlist_next_nvpair(snaps, NULL); pair != NULL; 1948 pair = nvlist_next_nvpair(snaps, pair)) { 1949 char fsname[ZFS_MAX_DATASET_NAME_LEN]; 1950 char *snapname = nvpair_name(pair); 1951 char *atp; 1952 void *cookie; 1953 1954 atp = strchr(snapname, '@'); 1955 if (atp == NULL) { 1956 error = SET_ERROR(EINVAL); 1957 break; 1958 } 1959 (void) strlcpy(fsname, snapname, atp - snapname + 1); 1960 1961 error = zil_suspend(fsname, &cookie); 1962 if (error != 0) 1963 break; 1964 fnvlist_add_uint64(suspended, fsname, 1965 (uintptr_t)cookie); 1966 } 1967 } 1968 1969 ddsa.ddsa_snaps = snaps; 1970 ddsa.ddsa_props = props; 1971 ddsa.ddsa_errors = errors; 1972 ddsa.ddsa_cr = CRED(); 1973 ddsa.ddsa_proc = curproc; 1974 1975 if (error == 0) { 1976 error = dsl_sync_task(firstname, dsl_dataset_snapshot_check, 1977 dsl_dataset_snapshot_sync, &ddsa, 1978 fnvlist_num_pairs(snaps) * 3, ZFS_SPACE_CHECK_NORMAL); 1979 } 1980 1981 if (suspended != NULL) { 1982 for (pair = nvlist_next_nvpair(suspended, NULL); pair != NULL; 1983 pair = nvlist_next_nvpair(suspended, pair)) { 1984 zil_resume((void *)(uintptr_t) 1985 fnvpair_value_uint64(pair)); 1986 } 1987 fnvlist_free(suspended); 1988 } 1989 1990 if (error == 0) { 1991 for (pair = nvlist_next_nvpair(snaps, NULL); pair != NULL; 1992 pair = nvlist_next_nvpair(snaps, pair)) { 1993 zvol_create_minor(nvpair_name(pair)); 1994 } 1995 } 1996 1997 return (error); 1998 } 1999 2000 typedef struct dsl_dataset_snapshot_tmp_arg { 2001 const char *ddsta_fsname; 2002 const char *ddsta_snapname; 2003 minor_t ddsta_cleanup_minor; 2004 const char *ddsta_htag; 2005 } dsl_dataset_snapshot_tmp_arg_t; 2006 2007 static int 2008 dsl_dataset_snapshot_tmp_check(void *arg, dmu_tx_t *tx) 2009 { 2010 dsl_dataset_snapshot_tmp_arg_t *ddsta = arg; 2011 dsl_pool_t *dp = dmu_tx_pool(tx); 2012 dsl_dataset_t *ds; 2013 int error; 2014 2015 error = dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds); 2016 if (error != 0) 2017 return (error); 2018 2019 /* NULL cred means no limit check for tmp snapshot */ 2020 error = dsl_dataset_snapshot_check_impl(ds, ddsta->ddsta_snapname, 2021 tx, B_FALSE, 0, NULL, NULL); 2022 if (error != 0) { 2023 dsl_dataset_rele(ds, FTAG); 2024 return (error); 2025 } 2026 2027 if (spa_version(dp->dp_spa) < SPA_VERSION_USERREFS) { 2028 dsl_dataset_rele(ds, FTAG); 2029 return (SET_ERROR(ENOTSUP)); 2030 } 2031 error = dsl_dataset_user_hold_check_one(NULL, ddsta->ddsta_htag, 2032 B_TRUE, tx); 2033 if (error != 0) { 2034 dsl_dataset_rele(ds, FTAG); 2035 return (error); 2036 } 2037 2038 dsl_dataset_rele(ds, FTAG); 2039 return (0); 2040 } 2041 2042 static void 2043 dsl_dataset_snapshot_tmp_sync(void *arg, dmu_tx_t *tx) 2044 { 2045 dsl_dataset_snapshot_tmp_arg_t *ddsta = arg; 2046 dsl_pool_t *dp = dmu_tx_pool(tx); 2047 dsl_dataset_t *ds = NULL; 2048 2049 VERIFY0(dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds)); 2050 2051 dsl_dataset_snapshot_sync_impl(ds, ddsta->ddsta_snapname, tx); 2052 dsl_dataset_user_hold_sync_one(ds->ds_prev, ddsta->ddsta_htag, 2053 ddsta->ddsta_cleanup_minor, gethrestime_sec(), tx); 2054 dsl_destroy_snapshot_sync_impl(ds->ds_prev, B_TRUE, tx); 2055 2056 dsl_dataset_rele(ds, FTAG); 2057 } 2058 2059 int 2060 dsl_dataset_snapshot_tmp(const char *fsname, const char *snapname, 2061 minor_t cleanup_minor, const char *htag) 2062 { 2063 dsl_dataset_snapshot_tmp_arg_t ddsta; 2064 int error; 2065 spa_t *spa; 2066 boolean_t needsuspend; 2067 void *cookie; 2068 2069 ddsta.ddsta_fsname = fsname; 2070 ddsta.ddsta_snapname = snapname; 2071 ddsta.ddsta_cleanup_minor = cleanup_minor; 2072 ddsta.ddsta_htag = htag; 2073 2074 error = spa_open(fsname, &spa, FTAG); 2075 if (error != 0) 2076 return (error); 2077 needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP); 2078 spa_close(spa, FTAG); 2079 2080 if (needsuspend) { 2081 error = zil_suspend(fsname, &cookie); 2082 if (error != 0) 2083 return (error); 2084 } 2085 2086 error = dsl_sync_task(fsname, dsl_dataset_snapshot_tmp_check, 2087 dsl_dataset_snapshot_tmp_sync, &ddsta, 3, ZFS_SPACE_CHECK_RESERVED); 2088 2089 if (needsuspend) 2090 zil_resume(cookie); 2091 return (error); 2092 } 2093 2094 void 2095 dsl_dataset_sync(dsl_dataset_t *ds, zio_t *zio, dmu_tx_t *tx) 2096 { 2097 ASSERT(dmu_tx_is_syncing(tx)); 2098 ASSERT(ds->ds_objset != NULL); 2099 ASSERT(dsl_dataset_phys(ds)->ds_next_snap_obj == 0); 2100 2101 /* 2102 * in case we had to change ds_fsid_guid when we opened it, 2103 * sync it out now. 2104 */ 2105 dmu_buf_will_dirty(ds->ds_dbuf, tx); 2106 dsl_dataset_phys(ds)->ds_fsid_guid = ds->ds_fsid_guid; 2107 2108 if (ds->ds_resume_bytes[tx->tx_txg & TXG_MASK] != 0) { 2109 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset, 2110 ds->ds_object, DS_FIELD_RESUME_OBJECT, 8, 1, 2111 &ds->ds_resume_object[tx->tx_txg & TXG_MASK], tx)); 2112 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset, 2113 ds->ds_object, DS_FIELD_RESUME_OFFSET, 8, 1, 2114 &ds->ds_resume_offset[tx->tx_txg & TXG_MASK], tx)); 2115 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset, 2116 ds->ds_object, DS_FIELD_RESUME_BYTES, 8, 1, 2117 &ds->ds_resume_bytes[tx->tx_txg & TXG_MASK], tx)); 2118 ds->ds_resume_object[tx->tx_txg & TXG_MASK] = 0; 2119 ds->ds_resume_offset[tx->tx_txg & TXG_MASK] = 0; 2120 ds->ds_resume_bytes[tx->tx_txg & TXG_MASK] = 0; 2121 } 2122 2123 dmu_objset_sync(ds->ds_objset, zio, tx); 2124 2125 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 2126 if (zfeature_active(f, ds->ds_feature_activation[f])) { 2127 if (zfeature_active(f, ds->ds_feature[f])) 2128 continue; 2129 dsl_dataset_activate_feature(ds->ds_object, f, 2130 ds->ds_feature_activation[f], tx); 2131 ds->ds_feature[f] = ds->ds_feature_activation[f]; 2132 } 2133 } 2134 } 2135 2136 /* 2137 * Check if the percentage of blocks shared between the clone and the 2138 * snapshot (as opposed to those that are clone only) is below a certain 2139 * threshold 2140 */ 2141 static boolean_t 2142 dsl_livelist_should_disable(dsl_dataset_t *ds) 2143 { 2144 uint64_t used, referenced; 2145 int percent_shared; 2146 2147 used = dsl_dir_get_usedds(ds->ds_dir); 2148 referenced = dsl_get_referenced(ds); 2149 if (referenced == 0) 2150 return (B_FALSE); 2151 percent_shared = (100 * (referenced - used)) / referenced; 2152 if (percent_shared <= zfs_livelist_min_percent_shared) 2153 return (B_TRUE); 2154 return (B_FALSE); 2155 } 2156 2157 /* 2158 * Check if it is possible to combine two livelist entries into one. 2159 * This is the case if the combined number of 'live' blkptrs (ALLOCs that 2160 * don't have a matching FREE) is under the maximum sublist size. 2161 * We check this by subtracting twice the total number of frees from the total 2162 * number of blkptrs. FREEs are counted twice because each FREE blkptr 2163 * will cancel out an ALLOC blkptr when the livelist is processed. 2164 */ 2165 static boolean_t 2166 dsl_livelist_should_condense(dsl_deadlist_entry_t *first, 2167 dsl_deadlist_entry_t *next) 2168 { 2169 uint64_t total_free = first->dle_bpobj.bpo_phys->bpo_num_freed + 2170 next->dle_bpobj.bpo_phys->bpo_num_freed; 2171 uint64_t total_entries = first->dle_bpobj.bpo_phys->bpo_num_blkptrs + 2172 next->dle_bpobj.bpo_phys->bpo_num_blkptrs; 2173 if ((total_entries - (2 * total_free)) < zfs_livelist_max_entries) 2174 return (B_TRUE); 2175 return (B_FALSE); 2176 } 2177 2178 typedef struct try_condense_arg { 2179 spa_t *spa; 2180 dsl_dataset_t *ds; 2181 } try_condense_arg_t; 2182 2183 /* 2184 * Iterate over the livelist entries, searching for a pair to condense. 2185 * A nonzero return value means stop, 0 means keep looking. 2186 */ 2187 static int 2188 dsl_livelist_try_condense(void *arg, dsl_deadlist_entry_t *first) 2189 { 2190 try_condense_arg_t *tca = arg; 2191 spa_t *spa = tca->spa; 2192 dsl_dataset_t *ds = tca->ds; 2193 dsl_deadlist_t *ll = &ds->ds_dir->dd_livelist; 2194 dsl_deadlist_entry_t *next; 2195 2196 /* The condense thread has not yet been created at import */ 2197 if (spa->spa_livelist_condense_zthr == NULL) 2198 return (1); 2199 2200 /* A condense is already in progress */ 2201 if (spa->spa_to_condense.ds != NULL) 2202 return (1); 2203 2204 next = AVL_NEXT(&ll->dl_tree, &first->dle_node); 2205 /* The livelist has only one entry - don't condense it */ 2206 if (next == NULL) 2207 return (1); 2208 2209 /* Next is the newest entry - don't condense it */ 2210 if (AVL_NEXT(&ll->dl_tree, &next->dle_node) == NULL) 2211 return (1); 2212 2213 /* This pair is not ready to condense but keep looking */ 2214 if (!dsl_livelist_should_condense(first, next)) 2215 return (0); 2216 2217 /* 2218 * Add a ref to prevent the dataset from being evicted while 2219 * the condense zthr or synctask are running. Ref will be 2220 * released at the end of the condense synctask 2221 */ 2222 dmu_buf_add_ref(ds->ds_dbuf, spa); 2223 2224 spa->spa_to_condense.ds = ds; 2225 spa->spa_to_condense.first = first; 2226 spa->spa_to_condense.next = next; 2227 spa->spa_to_condense.syncing = B_FALSE; 2228 spa->spa_to_condense.cancelled = B_FALSE; 2229 2230 zthr_wakeup(spa->spa_livelist_condense_zthr); 2231 return (1); 2232 } 2233 2234 static void 2235 dsl_flush_pending_livelist(dsl_dataset_t *ds, dmu_tx_t *tx) 2236 { 2237 dsl_dir_t *dd = ds->ds_dir; 2238 spa_t *spa = ds->ds_dir->dd_pool->dp_spa; 2239 dsl_deadlist_entry_t *last = dsl_deadlist_last(&dd->dd_livelist); 2240 2241 /* Check if we need to add a new sub-livelist */ 2242 if (last == NULL) { 2243 /* The livelist is empty */ 2244 dsl_deadlist_add_key(&dd->dd_livelist, 2245 tx->tx_txg - 1, tx); 2246 } else if (spa_sync_pass(spa) == 1) { 2247 /* 2248 * Check if the newest entry is full. If it is, make a new one. 2249 * We only do this once per sync because we could overfill a 2250 * sublist in one sync pass and don't want to add another entry 2251 * for a txg that is already represented. This ensures that 2252 * blkptrs born in the same txg are stored in the same sublist. 2253 */ 2254 bpobj_t bpobj = last->dle_bpobj; 2255 uint64_t all = bpobj.bpo_phys->bpo_num_blkptrs; 2256 uint64_t free = bpobj.bpo_phys->bpo_num_freed; 2257 uint64_t alloc = all - free; 2258 if (alloc > zfs_livelist_max_entries) { 2259 dsl_deadlist_add_key(&dd->dd_livelist, 2260 tx->tx_txg - 1, tx); 2261 } 2262 } 2263 2264 /* Insert each entry into the on-disk livelist */ 2265 bplist_iterate(&dd->dd_pending_allocs, 2266 dsl_deadlist_insert_alloc_cb, &dd->dd_livelist, tx); 2267 bplist_iterate(&dd->dd_pending_frees, 2268 dsl_deadlist_insert_free_cb, &dd->dd_livelist, tx); 2269 2270 /* Attempt to condense every pair of adjacent entries */ 2271 try_condense_arg_t arg = { 2272 .spa = spa, 2273 .ds = ds 2274 }; 2275 dsl_deadlist_iterate(&dd->dd_livelist, dsl_livelist_try_condense, 2276 &arg); 2277 } 2278 2279 void 2280 dsl_dataset_sync_done(dsl_dataset_t *ds, dmu_tx_t *tx) 2281 { 2282 objset_t *os = ds->ds_objset; 2283 2284 bplist_iterate(&ds->ds_pending_deadlist, 2285 dsl_deadlist_insert_alloc_cb, &ds->ds_deadlist, tx); 2286 2287 if (dsl_deadlist_is_open(&ds->ds_dir->dd_livelist)) { 2288 dsl_flush_pending_livelist(ds, tx); 2289 if (dsl_livelist_should_disable(ds)) { 2290 dsl_dir_remove_livelist(ds->ds_dir, tx, B_TRUE); 2291 } 2292 } 2293 2294 dsl_bookmark_sync_done(ds, tx); 2295 2296 multilist_destroy(&os->os_synced_dnodes); 2297 2298 if (os->os_encrypted) 2299 os->os_next_write_raw[tx->tx_txg & TXG_MASK] = B_FALSE; 2300 else 2301 ASSERT0(os->os_next_write_raw[tx->tx_txg & TXG_MASK]); 2302 2303 ASSERT(!dmu_objset_is_dirty(os, dmu_tx_get_txg(tx))); 2304 2305 dmu_buf_rele(ds->ds_dbuf, ds); 2306 } 2307 2308 int 2309 get_clones_stat_impl(dsl_dataset_t *ds, nvlist_t *val) 2310 { 2311 uint64_t count = 0; 2312 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 2313 zap_cursor_t zc; 2314 zap_attribute_t za; 2315 2316 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool)); 2317 2318 /* 2319 * There may be missing entries in ds_next_clones_obj 2320 * due to a bug in a previous version of the code. 2321 * Only trust it if it has the right number of entries. 2322 */ 2323 if (dsl_dataset_phys(ds)->ds_next_clones_obj != 0) { 2324 VERIFY0(zap_count(mos, dsl_dataset_phys(ds)->ds_next_clones_obj, 2325 &count)); 2326 } 2327 if (count != dsl_dataset_phys(ds)->ds_num_children - 1) { 2328 return (SET_ERROR(ENOENT)); 2329 } 2330 for (zap_cursor_init(&zc, mos, 2331 dsl_dataset_phys(ds)->ds_next_clones_obj); 2332 zap_cursor_retrieve(&zc, &za) == 0; 2333 zap_cursor_advance(&zc)) { 2334 dsl_dataset_t *clone; 2335 char buf[ZFS_MAX_DATASET_NAME_LEN]; 2336 VERIFY0(dsl_dataset_hold_obj(ds->ds_dir->dd_pool, 2337 za.za_first_integer, FTAG, &clone)); 2338 dsl_dir_name(clone->ds_dir, buf); 2339 fnvlist_add_boolean(val, buf); 2340 dsl_dataset_rele(clone, FTAG); 2341 } 2342 zap_cursor_fini(&zc); 2343 return (0); 2344 } 2345 2346 void 2347 get_clones_stat(dsl_dataset_t *ds, nvlist_t *nv) 2348 { 2349 nvlist_t *propval = fnvlist_alloc(); 2350 nvlist_t *val = fnvlist_alloc(); 2351 2352 if (get_clones_stat_impl(ds, val) == 0) { 2353 fnvlist_add_nvlist(propval, ZPROP_VALUE, val); 2354 fnvlist_add_nvlist(nv, zfs_prop_to_name(ZFS_PROP_CLONES), 2355 propval); 2356 } 2357 2358 nvlist_free(val); 2359 nvlist_free(propval); 2360 } 2361 2362 static char * 2363 get_receive_resume_token_impl(dsl_dataset_t *ds) 2364 { 2365 if (!dsl_dataset_has_resume_receive_state(ds)) 2366 return (NULL); 2367 2368 dsl_pool_t *dp = ds->ds_dir->dd_pool; 2369 char *str; 2370 void *packed; 2371 uint8_t *compressed; 2372 uint64_t val; 2373 nvlist_t *token_nv = fnvlist_alloc(); 2374 size_t packed_size, compressed_size; 2375 2376 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 2377 DS_FIELD_RESUME_FROMGUID, sizeof (val), 1, &val) == 0) { 2378 fnvlist_add_uint64(token_nv, "fromguid", val); 2379 } 2380 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 2381 DS_FIELD_RESUME_OBJECT, sizeof (val), 1, &val) == 0) { 2382 fnvlist_add_uint64(token_nv, "object", val); 2383 } 2384 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 2385 DS_FIELD_RESUME_OFFSET, sizeof (val), 1, &val) == 0) { 2386 fnvlist_add_uint64(token_nv, "offset", val); 2387 } 2388 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 2389 DS_FIELD_RESUME_BYTES, sizeof (val), 1, &val) == 0) { 2390 fnvlist_add_uint64(token_nv, "bytes", val); 2391 } 2392 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 2393 DS_FIELD_RESUME_TOGUID, sizeof (val), 1, &val) == 0) { 2394 fnvlist_add_uint64(token_nv, "toguid", val); 2395 } 2396 char buf[MAXNAMELEN]; 2397 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 2398 DS_FIELD_RESUME_TONAME, 1, sizeof (buf), buf) == 0) { 2399 fnvlist_add_string(token_nv, "toname", buf); 2400 } 2401 if (zap_contains(dp->dp_meta_objset, ds->ds_object, 2402 DS_FIELD_RESUME_LARGEBLOCK) == 0) { 2403 fnvlist_add_boolean(token_nv, "largeblockok"); 2404 } 2405 if (zap_contains(dp->dp_meta_objset, ds->ds_object, 2406 DS_FIELD_RESUME_EMBEDOK) == 0) { 2407 fnvlist_add_boolean(token_nv, "embedok"); 2408 } 2409 if (zap_contains(dp->dp_meta_objset, ds->ds_object, 2410 DS_FIELD_RESUME_COMPRESSOK) == 0) { 2411 fnvlist_add_boolean(token_nv, "compressok"); 2412 } 2413 if (zap_contains(dp->dp_meta_objset, ds->ds_object, 2414 DS_FIELD_RESUME_RAWOK) == 0) { 2415 fnvlist_add_boolean(token_nv, "rawok"); 2416 } 2417 if (dsl_dataset_feature_is_active(ds, 2418 SPA_FEATURE_REDACTED_DATASETS)) { 2419 uint64_t num_redact_snaps = 0; 2420 uint64_t *redact_snaps = NULL; 2421 VERIFY3B(dsl_dataset_get_uint64_array_feature(ds, 2422 SPA_FEATURE_REDACTED_DATASETS, &num_redact_snaps, 2423 &redact_snaps), ==, B_TRUE); 2424 fnvlist_add_uint64_array(token_nv, "redact_snaps", 2425 redact_snaps, num_redact_snaps); 2426 } 2427 if (zap_contains(dp->dp_meta_objset, ds->ds_object, 2428 DS_FIELD_RESUME_REDACT_BOOKMARK_SNAPS) == 0) { 2429 uint64_t num_redact_snaps = 0, int_size = 0; 2430 uint64_t *redact_snaps = NULL; 2431 VERIFY0(zap_length(dp->dp_meta_objset, ds->ds_object, 2432 DS_FIELD_RESUME_REDACT_BOOKMARK_SNAPS, &int_size, 2433 &num_redact_snaps)); 2434 ASSERT3U(int_size, ==, sizeof (uint64_t)); 2435 2436 redact_snaps = kmem_alloc(int_size * num_redact_snaps, 2437 KM_SLEEP); 2438 VERIFY0(zap_lookup(dp->dp_meta_objset, ds->ds_object, 2439 DS_FIELD_RESUME_REDACT_BOOKMARK_SNAPS, int_size, 2440 num_redact_snaps, redact_snaps)); 2441 fnvlist_add_uint64_array(token_nv, "book_redact_snaps", 2442 redact_snaps, num_redact_snaps); 2443 kmem_free(redact_snaps, int_size * num_redact_snaps); 2444 } 2445 packed = fnvlist_pack(token_nv, &packed_size); 2446 fnvlist_free(token_nv); 2447 compressed = kmem_alloc(packed_size, KM_SLEEP); 2448 2449 compressed_size = gzip_compress(packed, compressed, 2450 packed_size, packed_size, 6); 2451 2452 zio_cksum_t cksum; 2453 fletcher_4_native_varsize(compressed, compressed_size, &cksum); 2454 2455 size_t alloc_size = compressed_size * 2 + 1; 2456 str = kmem_alloc(alloc_size, KM_SLEEP); 2457 for (int i = 0; i < compressed_size; i++) { 2458 size_t offset = i * 2; 2459 (void) snprintf(str + offset, alloc_size - offset, 2460 "%02x", compressed[i]); 2461 } 2462 str[compressed_size * 2] = '\0'; 2463 char *propval = kmem_asprintf("%u-%llx-%llx-%s", 2464 ZFS_SEND_RESUME_TOKEN_VERSION, 2465 (longlong_t)cksum.zc_word[0], 2466 (longlong_t)packed_size, str); 2467 kmem_free(packed, packed_size); 2468 kmem_free(str, alloc_size); 2469 kmem_free(compressed, packed_size); 2470 return (propval); 2471 } 2472 2473 /* 2474 * Returns a string that represents the receive resume state token. It should 2475 * be freed with strfree(). NULL is returned if no resume state is present. 2476 */ 2477 char * 2478 get_receive_resume_token(dsl_dataset_t *ds) 2479 { 2480 /* 2481 * A failed "newfs" (e.g. full) resumable receive leaves 2482 * the stats set on this dataset. Check here for the prop. 2483 */ 2484 char *token = get_receive_resume_token_impl(ds); 2485 if (token != NULL) 2486 return (token); 2487 /* 2488 * A failed incremental resumable receive leaves the 2489 * stats set on our child named "%recv". Check the child 2490 * for the prop. 2491 */ 2492 /* 6 extra bytes for /%recv */ 2493 char name[ZFS_MAX_DATASET_NAME_LEN + 6]; 2494 dsl_dataset_t *recv_ds; 2495 dsl_dataset_name(ds, name); 2496 if (strlcat(name, "/", sizeof (name)) < sizeof (name) && 2497 strlcat(name, recv_clone_name, sizeof (name)) < sizeof (name) && 2498 dsl_dataset_hold(ds->ds_dir->dd_pool, name, FTAG, &recv_ds) == 0) { 2499 token = get_receive_resume_token_impl(recv_ds); 2500 dsl_dataset_rele(recv_ds, FTAG); 2501 } 2502 return (token); 2503 } 2504 2505 uint64_t 2506 dsl_get_refratio(dsl_dataset_t *ds) 2507 { 2508 uint64_t ratio = dsl_dataset_phys(ds)->ds_compressed_bytes == 0 ? 100 : 2509 (dsl_dataset_phys(ds)->ds_uncompressed_bytes * 100 / 2510 dsl_dataset_phys(ds)->ds_compressed_bytes); 2511 return (ratio); 2512 } 2513 2514 uint64_t 2515 dsl_get_logicalreferenced(dsl_dataset_t *ds) 2516 { 2517 return (dsl_dataset_phys(ds)->ds_uncompressed_bytes); 2518 } 2519 2520 uint64_t 2521 dsl_get_compressratio(dsl_dataset_t *ds) 2522 { 2523 if (ds->ds_is_snapshot) { 2524 return (dsl_get_refratio(ds)); 2525 } else { 2526 dsl_dir_t *dd = ds->ds_dir; 2527 mutex_enter(&dd->dd_lock); 2528 uint64_t val = dsl_dir_get_compressratio(dd); 2529 mutex_exit(&dd->dd_lock); 2530 return (val); 2531 } 2532 } 2533 2534 uint64_t 2535 dsl_get_used(dsl_dataset_t *ds) 2536 { 2537 if (ds->ds_is_snapshot) { 2538 return (dsl_dataset_phys(ds)->ds_unique_bytes); 2539 } else { 2540 dsl_dir_t *dd = ds->ds_dir; 2541 mutex_enter(&dd->dd_lock); 2542 uint64_t val = dsl_dir_get_used(dd); 2543 mutex_exit(&dd->dd_lock); 2544 return (val); 2545 } 2546 } 2547 2548 uint64_t 2549 dsl_get_creation(dsl_dataset_t *ds) 2550 { 2551 return (dsl_dataset_phys(ds)->ds_creation_time); 2552 } 2553 2554 uint64_t 2555 dsl_get_creationtxg(dsl_dataset_t *ds) 2556 { 2557 return (dsl_dataset_phys(ds)->ds_creation_txg); 2558 } 2559 2560 uint64_t 2561 dsl_get_refquota(dsl_dataset_t *ds) 2562 { 2563 return (ds->ds_quota); 2564 } 2565 2566 uint64_t 2567 dsl_get_refreservation(dsl_dataset_t *ds) 2568 { 2569 return (ds->ds_reserved); 2570 } 2571 2572 uint64_t 2573 dsl_get_guid(dsl_dataset_t *ds) 2574 { 2575 return (dsl_dataset_phys(ds)->ds_guid); 2576 } 2577 2578 uint64_t 2579 dsl_get_unique(dsl_dataset_t *ds) 2580 { 2581 return (dsl_dataset_phys(ds)->ds_unique_bytes); 2582 } 2583 2584 uint64_t 2585 dsl_get_objsetid(dsl_dataset_t *ds) 2586 { 2587 return (ds->ds_object); 2588 } 2589 2590 uint64_t 2591 dsl_get_userrefs(dsl_dataset_t *ds) 2592 { 2593 return (ds->ds_userrefs); 2594 } 2595 2596 uint64_t 2597 dsl_get_defer_destroy(dsl_dataset_t *ds) 2598 { 2599 return (DS_IS_DEFER_DESTROY(ds) ? 1 : 0); 2600 } 2601 2602 uint64_t 2603 dsl_get_referenced(dsl_dataset_t *ds) 2604 { 2605 return (dsl_dataset_phys(ds)->ds_referenced_bytes); 2606 } 2607 2608 uint64_t 2609 dsl_get_numclones(dsl_dataset_t *ds) 2610 { 2611 ASSERT(ds->ds_is_snapshot); 2612 return (dsl_dataset_phys(ds)->ds_num_children - 1); 2613 } 2614 2615 uint64_t 2616 dsl_get_inconsistent(dsl_dataset_t *ds) 2617 { 2618 return ((dsl_dataset_phys(ds)->ds_flags & DS_FLAG_INCONSISTENT) ? 2619 1 : 0); 2620 } 2621 2622 uint64_t 2623 dsl_get_redacted(dsl_dataset_t *ds) 2624 { 2625 return (dsl_dataset_feature_is_active(ds, 2626 SPA_FEATURE_REDACTED_DATASETS)); 2627 } 2628 2629 uint64_t 2630 dsl_get_available(dsl_dataset_t *ds) 2631 { 2632 uint64_t refdbytes = dsl_get_referenced(ds); 2633 uint64_t availbytes = dsl_dir_space_available(ds->ds_dir, 2634 NULL, 0, TRUE); 2635 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes) { 2636 availbytes += 2637 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes; 2638 } 2639 if (ds->ds_quota != 0) { 2640 /* 2641 * Adjust available bytes according to refquota 2642 */ 2643 if (refdbytes < ds->ds_quota) { 2644 availbytes = MIN(availbytes, 2645 ds->ds_quota - refdbytes); 2646 } else { 2647 availbytes = 0; 2648 } 2649 } 2650 return (availbytes); 2651 } 2652 2653 int 2654 dsl_get_written(dsl_dataset_t *ds, uint64_t *written) 2655 { 2656 dsl_pool_t *dp = ds->ds_dir->dd_pool; 2657 dsl_dataset_t *prev; 2658 int err = dsl_dataset_hold_obj(dp, 2659 dsl_dataset_phys(ds)->ds_prev_snap_obj, FTAG, &prev); 2660 if (err == 0) { 2661 uint64_t comp, uncomp; 2662 err = dsl_dataset_space_written(prev, ds, written, 2663 &comp, &uncomp); 2664 dsl_dataset_rele(prev, FTAG); 2665 } 2666 return (err); 2667 } 2668 2669 /* 2670 * 'snap' should be a buffer of size ZFS_MAX_DATASET_NAME_LEN. 2671 */ 2672 int 2673 dsl_get_prev_snap(dsl_dataset_t *ds, char *snap) 2674 { 2675 dsl_pool_t *dp = ds->ds_dir->dd_pool; 2676 if (ds->ds_prev != NULL && ds->ds_prev != dp->dp_origin_snap) { 2677 dsl_dataset_name(ds->ds_prev, snap); 2678 return (0); 2679 } else { 2680 return (SET_ERROR(ENOENT)); 2681 } 2682 } 2683 2684 void 2685 dsl_get_redact_snaps(dsl_dataset_t *ds, nvlist_t *propval) 2686 { 2687 uint64_t nsnaps; 2688 uint64_t *snaps; 2689 if (dsl_dataset_get_uint64_array_feature(ds, 2690 SPA_FEATURE_REDACTED_DATASETS, &nsnaps, &snaps)) { 2691 fnvlist_add_uint64_array(propval, ZPROP_VALUE, snaps, 2692 nsnaps); 2693 } 2694 } 2695 2696 /* 2697 * Returns the mountpoint property and source for the given dataset in the value 2698 * and source buffers. The value buffer must be at least as large as MAXPATHLEN 2699 * and the source buffer as least as large a ZFS_MAX_DATASET_NAME_LEN. 2700 * Returns 0 on success and an error on failure. 2701 */ 2702 int 2703 dsl_get_mountpoint(dsl_dataset_t *ds, const char *dsname, char *value, 2704 char *source) 2705 { 2706 int error; 2707 dsl_pool_t *dp = ds->ds_dir->dd_pool; 2708 2709 /* Retrieve the mountpoint value stored in the zap object */ 2710 error = dsl_prop_get_ds(ds, zfs_prop_to_name(ZFS_PROP_MOUNTPOINT), 1, 2711 ZAP_MAXVALUELEN, value, source); 2712 if (error != 0) { 2713 return (error); 2714 } 2715 2716 /* 2717 * Process the dsname and source to find the full mountpoint string. 2718 * Can be skipped for 'legacy' or 'none'. 2719 */ 2720 if (value[0] == '/') { 2721 char *buf = kmem_alloc(ZAP_MAXVALUELEN, KM_SLEEP); 2722 char *root = buf; 2723 const char *relpath; 2724 2725 /* 2726 * If we inherit the mountpoint, even from a dataset 2727 * with a received value, the source will be the path of 2728 * the dataset we inherit from. If source is 2729 * ZPROP_SOURCE_VAL_RECVD, the received value is not 2730 * inherited. 2731 */ 2732 if (strcmp(source, ZPROP_SOURCE_VAL_RECVD) == 0) { 2733 relpath = ""; 2734 } else { 2735 ASSERT0(strncmp(dsname, source, strlen(source))); 2736 relpath = dsname + strlen(source); 2737 if (relpath[0] == '/') 2738 relpath++; 2739 } 2740 2741 spa_altroot(dp->dp_spa, root, ZAP_MAXVALUELEN); 2742 2743 /* 2744 * Special case an alternate root of '/'. This will 2745 * avoid having multiple leading slashes in the 2746 * mountpoint path. 2747 */ 2748 if (strcmp(root, "/") == 0) 2749 root++; 2750 2751 /* 2752 * If the mountpoint is '/' then skip over this 2753 * if we are obtaining either an alternate root or 2754 * an inherited mountpoint. 2755 */ 2756 char *mnt = value; 2757 if (value[1] == '\0' && (root[0] != '\0' || 2758 relpath[0] != '\0')) 2759 mnt = value + 1; 2760 2761 mnt = kmem_strdup(mnt); 2762 2763 if (relpath[0] == '\0') { 2764 (void) snprintf(value, ZAP_MAXVALUELEN, "%s%s", 2765 root, mnt); 2766 } else { 2767 (void) snprintf(value, ZAP_MAXVALUELEN, "%s%s%s%s", 2768 root, mnt, relpath[0] == '@' ? "" : "/", 2769 relpath); 2770 } 2771 kmem_free(buf, ZAP_MAXVALUELEN); 2772 kmem_strfree(mnt); 2773 } 2774 2775 return (0); 2776 } 2777 2778 void 2779 dsl_dataset_stats(dsl_dataset_t *ds, nvlist_t *nv) 2780 { 2781 dsl_pool_t *dp __maybe_unused = ds->ds_dir->dd_pool; 2782 2783 ASSERT(dsl_pool_config_held(dp)); 2784 2785 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRATIO, 2786 dsl_get_refratio(ds)); 2787 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_LOGICALREFERENCED, 2788 dsl_get_logicalreferenced(ds)); 2789 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_COMPRESSRATIO, 2790 dsl_get_compressratio(ds)); 2791 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USED, 2792 dsl_get_used(ds)); 2793 2794 if (ds->ds_is_snapshot) { 2795 get_clones_stat(ds, nv); 2796 } else { 2797 char buf[ZFS_MAX_DATASET_NAME_LEN]; 2798 if (dsl_get_prev_snap(ds, buf) == 0) 2799 dsl_prop_nvlist_add_string(nv, ZFS_PROP_PREV_SNAP, 2800 buf); 2801 dsl_dir_stats(ds->ds_dir, nv); 2802 } 2803 2804 nvlist_t *propval = fnvlist_alloc(); 2805 dsl_get_redact_snaps(ds, propval); 2806 fnvlist_add_nvlist(nv, zfs_prop_to_name(ZFS_PROP_REDACT_SNAPS), 2807 propval); 2808 nvlist_free(propval); 2809 2810 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_AVAILABLE, 2811 dsl_get_available(ds)); 2812 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFERENCED, 2813 dsl_get_referenced(ds)); 2814 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATION, 2815 dsl_get_creation(ds)); 2816 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATETXG, 2817 dsl_get_creationtxg(ds)); 2818 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFQUOTA, 2819 dsl_get_refquota(ds)); 2820 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRESERVATION, 2821 dsl_get_refreservation(ds)); 2822 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_GUID, 2823 dsl_get_guid(ds)); 2824 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_UNIQUE, 2825 dsl_get_unique(ds)); 2826 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_OBJSETID, 2827 dsl_get_objsetid(ds)); 2828 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USERREFS, 2829 dsl_get_userrefs(ds)); 2830 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_DEFER_DESTROY, 2831 dsl_get_defer_destroy(ds)); 2832 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_SNAPSHOTS_CHANGED, 2833 dsl_dir_snap_cmtime(ds->ds_dir).tv_sec); 2834 dsl_dataset_crypt_stats(ds, nv); 2835 2836 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) { 2837 uint64_t written; 2838 if (dsl_get_written(ds, &written) == 0) { 2839 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_WRITTEN, 2840 written); 2841 } 2842 } 2843 2844 if (!dsl_dataset_is_snapshot(ds)) { 2845 char *token = get_receive_resume_token(ds); 2846 if (token != NULL) { 2847 dsl_prop_nvlist_add_string(nv, 2848 ZFS_PROP_RECEIVE_RESUME_TOKEN, token); 2849 kmem_strfree(token); 2850 } 2851 } 2852 } 2853 2854 void 2855 dsl_dataset_fast_stat(dsl_dataset_t *ds, dmu_objset_stats_t *stat) 2856 { 2857 dsl_pool_t *dp __maybe_unused = ds->ds_dir->dd_pool; 2858 ASSERT(dsl_pool_config_held(dp)); 2859 2860 stat->dds_creation_txg = dsl_get_creationtxg(ds); 2861 stat->dds_inconsistent = dsl_get_inconsistent(ds); 2862 stat->dds_guid = dsl_get_guid(ds); 2863 stat->dds_redacted = dsl_get_redacted(ds); 2864 stat->dds_origin[0] = '\0'; 2865 if (ds->ds_is_snapshot) { 2866 stat->dds_is_snapshot = B_TRUE; 2867 stat->dds_num_clones = dsl_get_numclones(ds); 2868 } else { 2869 stat->dds_is_snapshot = B_FALSE; 2870 stat->dds_num_clones = 0; 2871 2872 if (dsl_dir_is_clone(ds->ds_dir)) { 2873 dsl_dir_get_origin(ds->ds_dir, stat->dds_origin); 2874 } 2875 } 2876 } 2877 2878 uint64_t 2879 dsl_dataset_fsid_guid(dsl_dataset_t *ds) 2880 { 2881 return (ds->ds_fsid_guid); 2882 } 2883 2884 void 2885 dsl_dataset_space(dsl_dataset_t *ds, 2886 uint64_t *refdbytesp, uint64_t *availbytesp, 2887 uint64_t *usedobjsp, uint64_t *availobjsp) 2888 { 2889 *refdbytesp = dsl_dataset_phys(ds)->ds_referenced_bytes; 2890 *availbytesp = dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE); 2891 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes) 2892 *availbytesp += 2893 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes; 2894 if (ds->ds_quota != 0) { 2895 /* 2896 * Adjust available bytes according to refquota 2897 */ 2898 if (*refdbytesp < ds->ds_quota) 2899 *availbytesp = MIN(*availbytesp, 2900 ds->ds_quota - *refdbytesp); 2901 else 2902 *availbytesp = 0; 2903 } 2904 rrw_enter(&ds->ds_bp_rwlock, RW_READER, FTAG); 2905 *usedobjsp = BP_GET_FILL(&dsl_dataset_phys(ds)->ds_bp); 2906 rrw_exit(&ds->ds_bp_rwlock, FTAG); 2907 *availobjsp = DN_MAX_OBJECT - *usedobjsp; 2908 } 2909 2910 boolean_t 2911 dsl_dataset_modified_since_snap(dsl_dataset_t *ds, dsl_dataset_t *snap) 2912 { 2913 dsl_pool_t *dp __maybe_unused = ds->ds_dir->dd_pool; 2914 uint64_t birth; 2915 2916 ASSERT(dsl_pool_config_held(dp)); 2917 if (snap == NULL) 2918 return (B_FALSE); 2919 rrw_enter(&ds->ds_bp_rwlock, RW_READER, FTAG); 2920 birth = dsl_dataset_get_blkptr(ds)->blk_birth; 2921 rrw_exit(&ds->ds_bp_rwlock, FTAG); 2922 if (birth > dsl_dataset_phys(snap)->ds_creation_txg) { 2923 objset_t *os, *os_snap; 2924 /* 2925 * It may be that only the ZIL differs, because it was 2926 * reset in the head. Don't count that as being 2927 * modified. 2928 */ 2929 if (dmu_objset_from_ds(ds, &os) != 0) 2930 return (B_TRUE); 2931 if (dmu_objset_from_ds(snap, &os_snap) != 0) 2932 return (B_TRUE); 2933 return (memcmp(&os->os_phys->os_meta_dnode, 2934 &os_snap->os_phys->os_meta_dnode, 2935 sizeof (os->os_phys->os_meta_dnode)) != 0); 2936 } 2937 return (B_FALSE); 2938 } 2939 2940 static int 2941 dsl_dataset_rename_snapshot_check_impl(dsl_pool_t *dp, 2942 dsl_dataset_t *hds, void *arg) 2943 { 2944 (void) dp; 2945 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 2946 int error; 2947 uint64_t val; 2948 2949 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val); 2950 if (error != 0) { 2951 /* ignore nonexistent snapshots */ 2952 return (error == ENOENT ? 0 : error); 2953 } 2954 2955 /* new name should not exist */ 2956 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_newsnapname, &val); 2957 if (error == 0) 2958 error = SET_ERROR(EEXIST); 2959 else if (error == ENOENT) 2960 error = 0; 2961 2962 /* dataset name + 1 for the "@" + the new snapshot name must fit */ 2963 if (dsl_dir_namelen(hds->ds_dir) + 1 + 2964 strlen(ddrsa->ddrsa_newsnapname) >= ZFS_MAX_DATASET_NAME_LEN) 2965 error = SET_ERROR(ENAMETOOLONG); 2966 2967 return (error); 2968 } 2969 2970 int 2971 dsl_dataset_rename_snapshot_check(void *arg, dmu_tx_t *tx) 2972 { 2973 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 2974 dsl_pool_t *dp = dmu_tx_pool(tx); 2975 dsl_dataset_t *hds; 2976 int error; 2977 2978 error = dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds); 2979 if (error != 0) 2980 return (error); 2981 2982 if (ddrsa->ddrsa_recursive) { 2983 error = dmu_objset_find_dp(dp, hds->ds_dir->dd_object, 2984 dsl_dataset_rename_snapshot_check_impl, ddrsa, 2985 DS_FIND_CHILDREN); 2986 } else { 2987 error = dsl_dataset_rename_snapshot_check_impl(dp, hds, ddrsa); 2988 } 2989 dsl_dataset_rele(hds, FTAG); 2990 return (error); 2991 } 2992 2993 static int 2994 dsl_dataset_rename_snapshot_sync_impl(dsl_pool_t *dp, 2995 dsl_dataset_t *hds, void *arg) 2996 { 2997 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 2998 dsl_dataset_t *ds; 2999 uint64_t val; 3000 dmu_tx_t *tx = ddrsa->ddrsa_tx; 3001 int error; 3002 3003 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val); 3004 ASSERT(error == 0 || error == ENOENT); 3005 if (error == ENOENT) { 3006 /* ignore nonexistent snapshots */ 3007 return (0); 3008 } 3009 3010 VERIFY0(dsl_dataset_hold_obj(dp, val, FTAG, &ds)); 3011 3012 /* log before we change the name */ 3013 spa_history_log_internal_ds(ds, "rename", tx, 3014 "-> @%s", ddrsa->ddrsa_newsnapname); 3015 3016 VERIFY0(dsl_dataset_snap_remove(hds, ddrsa->ddrsa_oldsnapname, tx, 3017 B_FALSE)); 3018 mutex_enter(&ds->ds_lock); 3019 (void) strlcpy(ds->ds_snapname, ddrsa->ddrsa_newsnapname, 3020 sizeof (ds->ds_snapname)); 3021 mutex_exit(&ds->ds_lock); 3022 VERIFY0(zap_add(dp->dp_meta_objset, 3023 dsl_dataset_phys(hds)->ds_snapnames_zapobj, 3024 ds->ds_snapname, 8, 1, &ds->ds_object, tx)); 3025 zvol_rename_minors(dp->dp_spa, ddrsa->ddrsa_oldsnapname, 3026 ddrsa->ddrsa_newsnapname, B_TRUE); 3027 3028 dsl_dataset_rele(ds, FTAG); 3029 return (0); 3030 } 3031 3032 void 3033 dsl_dataset_rename_snapshot_sync(void *arg, dmu_tx_t *tx) 3034 { 3035 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 3036 dsl_pool_t *dp = dmu_tx_pool(tx); 3037 dsl_dataset_t *hds = NULL; 3038 3039 VERIFY0(dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds)); 3040 ddrsa->ddrsa_tx = tx; 3041 if (ddrsa->ddrsa_recursive) { 3042 VERIFY0(dmu_objset_find_dp(dp, hds->ds_dir->dd_object, 3043 dsl_dataset_rename_snapshot_sync_impl, ddrsa, 3044 DS_FIND_CHILDREN)); 3045 } else { 3046 VERIFY0(dsl_dataset_rename_snapshot_sync_impl(dp, hds, ddrsa)); 3047 } 3048 dsl_dataset_rele(hds, FTAG); 3049 } 3050 3051 int 3052 dsl_dataset_rename_snapshot(const char *fsname, 3053 const char *oldsnapname, const char *newsnapname, boolean_t recursive) 3054 { 3055 dsl_dataset_rename_snapshot_arg_t ddrsa; 3056 3057 ddrsa.ddrsa_fsname = fsname; 3058 ddrsa.ddrsa_oldsnapname = oldsnapname; 3059 ddrsa.ddrsa_newsnapname = newsnapname; 3060 ddrsa.ddrsa_recursive = recursive; 3061 3062 return (dsl_sync_task(fsname, dsl_dataset_rename_snapshot_check, 3063 dsl_dataset_rename_snapshot_sync, &ddrsa, 3064 1, ZFS_SPACE_CHECK_RESERVED)); 3065 } 3066 3067 /* 3068 * If we're doing an ownership handoff, we need to make sure that there is 3069 * only one long hold on the dataset. We're not allowed to change anything here 3070 * so we don't permanently release the long hold or regular hold here. We want 3071 * to do this only when syncing to avoid the dataset unexpectedly going away 3072 * when we release the long hold. 3073 */ 3074 static int 3075 dsl_dataset_handoff_check(dsl_dataset_t *ds, void *owner, dmu_tx_t *tx) 3076 { 3077 boolean_t held = B_FALSE; 3078 3079 if (!dmu_tx_is_syncing(tx)) 3080 return (0); 3081 3082 dsl_dir_t *dd = ds->ds_dir; 3083 mutex_enter(&dd->dd_activity_lock); 3084 uint64_t holds = zfs_refcount_count(&ds->ds_longholds) - 3085 (owner != NULL ? 1 : 0); 3086 /* 3087 * The value of dd_activity_waiters can chance as soon as we drop the 3088 * lock, but we're fine with that; new waiters coming in or old 3089 * waiters leaving doesn't cause problems, since we're going to cancel 3090 * waiters later anyway. The goal of this check is to verify that no 3091 * non-waiters have long-holds, and all new long-holds will be 3092 * prevented because we're holding the pool config as writer. 3093 */ 3094 if (holds != dd->dd_activity_waiters) 3095 held = B_TRUE; 3096 mutex_exit(&dd->dd_activity_lock); 3097 3098 if (held) 3099 return (SET_ERROR(EBUSY)); 3100 3101 return (0); 3102 } 3103 3104 int 3105 dsl_dataset_rollback_check(void *arg, dmu_tx_t *tx) 3106 { 3107 dsl_dataset_rollback_arg_t *ddra = arg; 3108 dsl_pool_t *dp = dmu_tx_pool(tx); 3109 dsl_dataset_t *ds; 3110 int64_t unused_refres_delta; 3111 int error; 3112 3113 error = dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds); 3114 if (error != 0) 3115 return (error); 3116 3117 /* must not be a snapshot */ 3118 if (ds->ds_is_snapshot) { 3119 dsl_dataset_rele(ds, FTAG); 3120 return (SET_ERROR(EINVAL)); 3121 } 3122 3123 /* must have a most recent snapshot */ 3124 if (dsl_dataset_phys(ds)->ds_prev_snap_txg < TXG_INITIAL) { 3125 dsl_dataset_rele(ds, FTAG); 3126 return (SET_ERROR(ESRCH)); 3127 } 3128 3129 /* 3130 * No rollback to a snapshot created in the current txg, because 3131 * the rollback may dirty the dataset and create blocks that are 3132 * not reachable from the rootbp while having a birth txg that 3133 * falls into the snapshot's range. 3134 */ 3135 if (dmu_tx_is_syncing(tx) && 3136 dsl_dataset_phys(ds)->ds_prev_snap_txg >= tx->tx_txg) { 3137 dsl_dataset_rele(ds, FTAG); 3138 return (SET_ERROR(EAGAIN)); 3139 } 3140 3141 /* 3142 * If the expected target snapshot is specified, then check that 3143 * the latest snapshot is it. 3144 */ 3145 if (ddra->ddra_tosnap != NULL) { 3146 dsl_dataset_t *snapds; 3147 3148 /* Check if the target snapshot exists at all. */ 3149 error = dsl_dataset_hold(dp, ddra->ddra_tosnap, FTAG, &snapds); 3150 if (error != 0) { 3151 /* 3152 * ESRCH is used to signal that the target snapshot does 3153 * not exist, while ENOENT is used to report that 3154 * the rolled back dataset does not exist. 3155 * ESRCH is also used to cover other cases where the 3156 * target snapshot is not related to the dataset being 3157 * rolled back such as being in a different pool. 3158 */ 3159 if (error == ENOENT || error == EXDEV) 3160 error = SET_ERROR(ESRCH); 3161 dsl_dataset_rele(ds, FTAG); 3162 return (error); 3163 } 3164 ASSERT(snapds->ds_is_snapshot); 3165 3166 /* Check if the snapshot is the latest snapshot indeed. */ 3167 if (snapds != ds->ds_prev) { 3168 /* 3169 * Distinguish between the case where the only problem 3170 * is intervening snapshots (EEXIST) vs the snapshot 3171 * not being a valid target for rollback (ESRCH). 3172 */ 3173 if (snapds->ds_dir == ds->ds_dir || 3174 (dsl_dir_is_clone(ds->ds_dir) && 3175 dsl_dir_phys(ds->ds_dir)->dd_origin_obj == 3176 snapds->ds_object)) { 3177 error = SET_ERROR(EEXIST); 3178 } else { 3179 error = SET_ERROR(ESRCH); 3180 } 3181 dsl_dataset_rele(snapds, FTAG); 3182 dsl_dataset_rele(ds, FTAG); 3183 return (error); 3184 } 3185 dsl_dataset_rele(snapds, FTAG); 3186 } 3187 3188 /* must not have any bookmarks after the most recent snapshot */ 3189 if (dsl_bookmark_latest_txg(ds) > 3190 dsl_dataset_phys(ds)->ds_prev_snap_txg) { 3191 dsl_dataset_rele(ds, FTAG); 3192 return (SET_ERROR(EEXIST)); 3193 } 3194 3195 error = dsl_dataset_handoff_check(ds, ddra->ddra_owner, tx); 3196 if (error != 0) { 3197 dsl_dataset_rele(ds, FTAG); 3198 return (error); 3199 } 3200 3201 /* 3202 * Check if the snap we are rolling back to uses more than 3203 * the refquota. 3204 */ 3205 if (ds->ds_quota != 0 && 3206 dsl_dataset_phys(ds->ds_prev)->ds_referenced_bytes > ds->ds_quota) { 3207 dsl_dataset_rele(ds, FTAG); 3208 return (SET_ERROR(EDQUOT)); 3209 } 3210 3211 /* 3212 * When we do the clone swap, we will temporarily use more space 3213 * due to the refreservation (the head will no longer have any 3214 * unique space, so the entire amount of the refreservation will need 3215 * to be free). We will immediately destroy the clone, freeing 3216 * this space, but the freeing happens over many txg's. 3217 */ 3218 unused_refres_delta = (int64_t)MIN(ds->ds_reserved, 3219 dsl_dataset_phys(ds)->ds_unique_bytes); 3220 3221 if (unused_refres_delta > 0 && 3222 unused_refres_delta > 3223 dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE)) { 3224 dsl_dataset_rele(ds, FTAG); 3225 return (SET_ERROR(ENOSPC)); 3226 } 3227 3228 dsl_dataset_rele(ds, FTAG); 3229 return (0); 3230 } 3231 3232 void 3233 dsl_dataset_rollback_sync(void *arg, dmu_tx_t *tx) 3234 { 3235 dsl_dataset_rollback_arg_t *ddra = arg; 3236 dsl_pool_t *dp = dmu_tx_pool(tx); 3237 dsl_dataset_t *ds, *clone; 3238 uint64_t cloneobj; 3239 char namebuf[ZFS_MAX_DATASET_NAME_LEN]; 3240 3241 VERIFY0(dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds)); 3242 3243 dsl_dataset_name(ds->ds_prev, namebuf); 3244 fnvlist_add_string(ddra->ddra_result, "target", namebuf); 3245 3246 cloneobj = dsl_dataset_create_sync(ds->ds_dir, "%rollback", 3247 ds->ds_prev, DS_CREATE_FLAG_NODIRTY, kcred, NULL, tx); 3248 3249 VERIFY0(dsl_dataset_hold_obj(dp, cloneobj, FTAG, &clone)); 3250 3251 dsl_dataset_clone_swap_sync_impl(clone, ds, tx); 3252 dsl_dataset_zero_zil(ds, tx); 3253 3254 dsl_destroy_head_sync_impl(clone, tx); 3255 3256 dsl_dataset_rele(clone, FTAG); 3257 dsl_dataset_rele(ds, FTAG); 3258 } 3259 3260 /* 3261 * Rolls back the given filesystem or volume to the most recent snapshot. 3262 * The name of the most recent snapshot will be returned under key "target" 3263 * in the result nvlist. 3264 * 3265 * If owner != NULL: 3266 * - The existing dataset MUST be owned by the specified owner at entry 3267 * - Upon return, dataset will still be held by the same owner, whether we 3268 * succeed or not. 3269 * 3270 * This mode is required any time the existing filesystem is mounted. See 3271 * notes above zfs_suspend_fs() for further details. 3272 */ 3273 int 3274 dsl_dataset_rollback(const char *fsname, const char *tosnap, void *owner, 3275 nvlist_t *result) 3276 { 3277 dsl_dataset_rollback_arg_t ddra; 3278 3279 ddra.ddra_fsname = fsname; 3280 ddra.ddra_tosnap = tosnap; 3281 ddra.ddra_owner = owner; 3282 ddra.ddra_result = result; 3283 3284 return (dsl_sync_task(fsname, dsl_dataset_rollback_check, 3285 dsl_dataset_rollback_sync, &ddra, 3286 1, ZFS_SPACE_CHECK_RESERVED)); 3287 } 3288 3289 struct promotenode { 3290 list_node_t link; 3291 dsl_dataset_t *ds; 3292 }; 3293 3294 static int snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep); 3295 static int promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp, 3296 const void *tag); 3297 static void promote_rele(dsl_dataset_promote_arg_t *ddpa, const void *tag); 3298 3299 int 3300 dsl_dataset_promote_check(void *arg, dmu_tx_t *tx) 3301 { 3302 dsl_dataset_promote_arg_t *ddpa = arg; 3303 dsl_pool_t *dp = dmu_tx_pool(tx); 3304 dsl_dataset_t *hds; 3305 struct promotenode *snap; 3306 int err; 3307 uint64_t unused; 3308 uint64_t ss_mv_cnt; 3309 size_t max_snap_len; 3310 boolean_t conflicting_snaps; 3311 3312 err = promote_hold(ddpa, dp, FTAG); 3313 if (err != 0) 3314 return (err); 3315 3316 hds = ddpa->ddpa_clone; 3317 max_snap_len = MAXNAMELEN - strlen(ddpa->ddpa_clonename) - 1; 3318 3319 if (dsl_dataset_phys(hds)->ds_flags & DS_FLAG_NOPROMOTE) { 3320 promote_rele(ddpa, FTAG); 3321 return (SET_ERROR(EXDEV)); 3322 } 3323 3324 snap = list_head(&ddpa->shared_snaps); 3325 if (snap == NULL) { 3326 err = SET_ERROR(ENOENT); 3327 goto out; 3328 } 3329 dsl_dataset_t *const origin_ds = snap->ds; 3330 3331 /* 3332 * Encrypted clones share a DSL Crypto Key with their origin's dsl dir. 3333 * When doing a promote we must make sure the encryption root for 3334 * both the target and the target's origin does not change to avoid 3335 * needing to rewrap encryption keys 3336 */ 3337 err = dsl_dataset_promote_crypt_check(hds->ds_dir, origin_ds->ds_dir); 3338 if (err != 0) 3339 goto out; 3340 3341 /* 3342 * Compute and check the amount of space to transfer. Since this is 3343 * so expensive, don't do the preliminary check. 3344 */ 3345 if (!dmu_tx_is_syncing(tx)) { 3346 promote_rele(ddpa, FTAG); 3347 return (0); 3348 } 3349 3350 /* compute origin's new unique space */ 3351 snap = list_tail(&ddpa->clone_snaps); 3352 ASSERT(snap != NULL); 3353 ASSERT3U(dsl_dataset_phys(snap->ds)->ds_prev_snap_obj, ==, 3354 origin_ds->ds_object); 3355 dsl_deadlist_space_range(&snap->ds->ds_deadlist, 3356 dsl_dataset_phys(origin_ds)->ds_prev_snap_txg, UINT64_MAX, 3357 &ddpa->unique, &unused, &unused); 3358 3359 /* 3360 * Walk the snapshots that we are moving 3361 * 3362 * Compute space to transfer. Consider the incremental changes 3363 * to used by each snapshot: 3364 * (my used) = (prev's used) + (blocks born) - (blocks killed) 3365 * So each snapshot gave birth to: 3366 * (blocks born) = (my used) - (prev's used) + (blocks killed) 3367 * So a sequence would look like: 3368 * (uN - u(N-1) + kN) + ... + (u1 - u0 + k1) + (u0 - 0 + k0) 3369 * Which simplifies to: 3370 * uN + kN + kN-1 + ... + k1 + k0 3371 * Note however, if we stop before we reach the ORIGIN we get: 3372 * uN + kN + kN-1 + ... + kM - uM-1 3373 */ 3374 conflicting_snaps = B_FALSE; 3375 ss_mv_cnt = 0; 3376 ddpa->used = dsl_dataset_phys(origin_ds)->ds_referenced_bytes; 3377 ddpa->comp = dsl_dataset_phys(origin_ds)->ds_compressed_bytes; 3378 ddpa->uncomp = dsl_dataset_phys(origin_ds)->ds_uncompressed_bytes; 3379 for (snap = list_head(&ddpa->shared_snaps); snap; 3380 snap = list_next(&ddpa->shared_snaps, snap)) { 3381 uint64_t val, dlused, dlcomp, dluncomp; 3382 dsl_dataset_t *ds = snap->ds; 3383 3384 ss_mv_cnt++; 3385 3386 /* 3387 * If there are long holds, we won't be able to evict 3388 * the objset. 3389 */ 3390 if (dsl_dataset_long_held(ds)) { 3391 err = SET_ERROR(EBUSY); 3392 goto out; 3393 } 3394 3395 /* Check that the snapshot name does not conflict */ 3396 VERIFY0(dsl_dataset_get_snapname(ds)); 3397 if (strlen(ds->ds_snapname) >= max_snap_len) { 3398 err = SET_ERROR(ENAMETOOLONG); 3399 goto out; 3400 } 3401 err = dsl_dataset_snap_lookup(hds, ds->ds_snapname, &val); 3402 if (err == 0) { 3403 fnvlist_add_boolean(ddpa->err_ds, 3404 snap->ds->ds_snapname); 3405 conflicting_snaps = B_TRUE; 3406 } else if (err != ENOENT) { 3407 goto out; 3408 } 3409 3410 /* The very first snapshot does not have a deadlist */ 3411 if (dsl_dataset_phys(ds)->ds_prev_snap_obj == 0) 3412 continue; 3413 3414 dsl_deadlist_space(&ds->ds_deadlist, 3415 &dlused, &dlcomp, &dluncomp); 3416 ddpa->used += dlused; 3417 ddpa->comp += dlcomp; 3418 ddpa->uncomp += dluncomp; 3419 } 3420 3421 /* 3422 * Check that bookmarks that are being transferred don't have 3423 * name conflicts. 3424 */ 3425 for (dsl_bookmark_node_t *dbn = avl_first(&origin_ds->ds_bookmarks); 3426 dbn != NULL && dbn->dbn_phys.zbm_creation_txg <= 3427 dsl_dataset_phys(origin_ds)->ds_creation_txg; 3428 dbn = AVL_NEXT(&origin_ds->ds_bookmarks, dbn)) { 3429 if (strlen(dbn->dbn_name) >= max_snap_len) { 3430 err = SET_ERROR(ENAMETOOLONG); 3431 goto out; 3432 } 3433 zfs_bookmark_phys_t bm; 3434 err = dsl_bookmark_lookup_impl(ddpa->ddpa_clone, 3435 dbn->dbn_name, &bm); 3436 3437 if (err == 0) { 3438 fnvlist_add_boolean(ddpa->err_ds, dbn->dbn_name); 3439 conflicting_snaps = B_TRUE; 3440 } else if (err == ESRCH) { 3441 err = 0; 3442 } 3443 if (err != 0) { 3444 goto out; 3445 } 3446 } 3447 3448 /* 3449 * In order to return the full list of conflicting snapshots, we check 3450 * whether there was a conflict after traversing all of them. 3451 */ 3452 if (conflicting_snaps) { 3453 err = SET_ERROR(EEXIST); 3454 goto out; 3455 } 3456 3457 /* 3458 * If we are a clone of a clone then we never reached ORIGIN, 3459 * so we need to subtract out the clone origin's used space. 3460 */ 3461 if (ddpa->origin_origin) { 3462 ddpa->used -= 3463 dsl_dataset_phys(ddpa->origin_origin)->ds_referenced_bytes; 3464 ddpa->comp -= 3465 dsl_dataset_phys(ddpa->origin_origin)->ds_compressed_bytes; 3466 ddpa->uncomp -= 3467 dsl_dataset_phys(ddpa->origin_origin)-> 3468 ds_uncompressed_bytes; 3469 } 3470 3471 /* Check that there is enough space and limit headroom here */ 3472 err = dsl_dir_transfer_possible(origin_ds->ds_dir, hds->ds_dir, 3473 0, ss_mv_cnt, ddpa->used, ddpa->cr, ddpa->proc); 3474 if (err != 0) 3475 goto out; 3476 3477 /* 3478 * Compute the amounts of space that will be used by snapshots 3479 * after the promotion (for both origin and clone). For each, 3480 * it is the amount of space that will be on all of their 3481 * deadlists (that was not born before their new origin). 3482 */ 3483 if (dsl_dir_phys(hds->ds_dir)->dd_flags & DD_FLAG_USED_BREAKDOWN) { 3484 uint64_t space; 3485 3486 /* 3487 * Note, typically this will not be a clone of a clone, 3488 * so dd_origin_txg will be < TXG_INITIAL, so 3489 * these snaplist_space() -> dsl_deadlist_space_range() 3490 * calls will be fast because they do not have to 3491 * iterate over all bps. 3492 */ 3493 snap = list_head(&ddpa->origin_snaps); 3494 if (snap == NULL) { 3495 err = SET_ERROR(ENOENT); 3496 goto out; 3497 } 3498 err = snaplist_space(&ddpa->shared_snaps, 3499 snap->ds->ds_dir->dd_origin_txg, &ddpa->cloneusedsnap); 3500 if (err != 0) 3501 goto out; 3502 3503 err = snaplist_space(&ddpa->clone_snaps, 3504 snap->ds->ds_dir->dd_origin_txg, &space); 3505 if (err != 0) 3506 goto out; 3507 ddpa->cloneusedsnap += space; 3508 } 3509 if (dsl_dir_phys(origin_ds->ds_dir)->dd_flags & 3510 DD_FLAG_USED_BREAKDOWN) { 3511 err = snaplist_space(&ddpa->origin_snaps, 3512 dsl_dataset_phys(origin_ds)->ds_creation_txg, 3513 &ddpa->originusedsnap); 3514 if (err != 0) 3515 goto out; 3516 } 3517 3518 out: 3519 promote_rele(ddpa, FTAG); 3520 return (err); 3521 } 3522 3523 void 3524 dsl_dataset_promote_sync(void *arg, dmu_tx_t *tx) 3525 { 3526 dsl_dataset_promote_arg_t *ddpa = arg; 3527 dsl_pool_t *dp = dmu_tx_pool(tx); 3528 dsl_dataset_t *hds; 3529 struct promotenode *snap; 3530 dsl_dataset_t *origin_ds; 3531 dsl_dataset_t *origin_head; 3532 dsl_dir_t *dd; 3533 dsl_dir_t *odd = NULL; 3534 uint64_t oldnext_obj; 3535 int64_t delta; 3536 3537 ASSERT(nvlist_empty(ddpa->err_ds)); 3538 3539 VERIFY0(promote_hold(ddpa, dp, FTAG)); 3540 hds = ddpa->ddpa_clone; 3541 3542 ASSERT0(dsl_dataset_phys(hds)->ds_flags & DS_FLAG_NOPROMOTE); 3543 3544 snap = list_head(&ddpa->shared_snaps); 3545 origin_ds = snap->ds; 3546 dd = hds->ds_dir; 3547 3548 snap = list_head(&ddpa->origin_snaps); 3549 origin_head = snap->ds; 3550 3551 /* 3552 * We need to explicitly open odd, since origin_ds's dd will be 3553 * changing. 3554 */ 3555 VERIFY0(dsl_dir_hold_obj(dp, origin_ds->ds_dir->dd_object, 3556 NULL, FTAG, &odd)); 3557 3558 dsl_dataset_promote_crypt_sync(hds->ds_dir, odd, tx); 3559 3560 /* change origin's next snap */ 3561 dmu_buf_will_dirty(origin_ds->ds_dbuf, tx); 3562 oldnext_obj = dsl_dataset_phys(origin_ds)->ds_next_snap_obj; 3563 snap = list_tail(&ddpa->clone_snaps); 3564 ASSERT3U(dsl_dataset_phys(snap->ds)->ds_prev_snap_obj, ==, 3565 origin_ds->ds_object); 3566 dsl_dataset_phys(origin_ds)->ds_next_snap_obj = snap->ds->ds_object; 3567 3568 /* change the origin's next clone */ 3569 if (dsl_dataset_phys(origin_ds)->ds_next_clones_obj) { 3570 dsl_dataset_remove_from_next_clones(origin_ds, 3571 snap->ds->ds_object, tx); 3572 VERIFY0(zap_add_int(dp->dp_meta_objset, 3573 dsl_dataset_phys(origin_ds)->ds_next_clones_obj, 3574 oldnext_obj, tx)); 3575 } 3576 3577 /* change origin */ 3578 dmu_buf_will_dirty(dd->dd_dbuf, tx); 3579 ASSERT3U(dsl_dir_phys(dd)->dd_origin_obj, ==, origin_ds->ds_object); 3580 dsl_dir_phys(dd)->dd_origin_obj = dsl_dir_phys(odd)->dd_origin_obj; 3581 dd->dd_origin_txg = origin_head->ds_dir->dd_origin_txg; 3582 dmu_buf_will_dirty(odd->dd_dbuf, tx); 3583 dsl_dir_phys(odd)->dd_origin_obj = origin_ds->ds_object; 3584 origin_head->ds_dir->dd_origin_txg = 3585 dsl_dataset_phys(origin_ds)->ds_creation_txg; 3586 3587 /* change dd_clone entries */ 3588 if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 3589 VERIFY0(zap_remove_int(dp->dp_meta_objset, 3590 dsl_dir_phys(odd)->dd_clones, hds->ds_object, tx)); 3591 VERIFY0(zap_add_int(dp->dp_meta_objset, 3592 dsl_dir_phys(ddpa->origin_origin->ds_dir)->dd_clones, 3593 hds->ds_object, tx)); 3594 3595 VERIFY0(zap_remove_int(dp->dp_meta_objset, 3596 dsl_dir_phys(ddpa->origin_origin->ds_dir)->dd_clones, 3597 origin_head->ds_object, tx)); 3598 if (dsl_dir_phys(dd)->dd_clones == 0) { 3599 dsl_dir_phys(dd)->dd_clones = 3600 zap_create(dp->dp_meta_objset, DMU_OT_DSL_CLONES, 3601 DMU_OT_NONE, 0, tx); 3602 } 3603 VERIFY0(zap_add_int(dp->dp_meta_objset, 3604 dsl_dir_phys(dd)->dd_clones, origin_head->ds_object, tx)); 3605 } 3606 3607 /* 3608 * Move bookmarks to this dir. 3609 */ 3610 dsl_bookmark_node_t *dbn_next; 3611 for (dsl_bookmark_node_t *dbn = avl_first(&origin_head->ds_bookmarks); 3612 dbn != NULL && dbn->dbn_phys.zbm_creation_txg <= 3613 dsl_dataset_phys(origin_ds)->ds_creation_txg; 3614 dbn = dbn_next) { 3615 dbn_next = AVL_NEXT(&origin_head->ds_bookmarks, dbn); 3616 3617 avl_remove(&origin_head->ds_bookmarks, dbn); 3618 VERIFY0(zap_remove(dp->dp_meta_objset, 3619 origin_head->ds_bookmarks_obj, dbn->dbn_name, tx)); 3620 3621 dsl_bookmark_node_add(hds, dbn, tx); 3622 } 3623 3624 dsl_bookmark_next_changed(hds, origin_ds, tx); 3625 3626 /* move snapshots to this dir */ 3627 for (snap = list_head(&ddpa->shared_snaps); snap; 3628 snap = list_next(&ddpa->shared_snaps, snap)) { 3629 dsl_dataset_t *ds = snap->ds; 3630 3631 /* 3632 * Property callbacks are registered to a particular 3633 * dsl_dir. Since ours is changing, evict the objset 3634 * so that they will be unregistered from the old dsl_dir. 3635 */ 3636 if (ds->ds_objset) { 3637 dmu_objset_evict(ds->ds_objset); 3638 ds->ds_objset = NULL; 3639 } 3640 3641 /* move snap name entry */ 3642 VERIFY0(dsl_dataset_get_snapname(ds)); 3643 VERIFY0(dsl_dataset_snap_remove(origin_head, 3644 ds->ds_snapname, tx, B_TRUE)); 3645 VERIFY0(zap_add(dp->dp_meta_objset, 3646 dsl_dataset_phys(hds)->ds_snapnames_zapobj, ds->ds_snapname, 3647 8, 1, &ds->ds_object, tx)); 3648 dsl_fs_ss_count_adjust(hds->ds_dir, 1, 3649 DD_FIELD_SNAPSHOT_COUNT, tx); 3650 3651 /* change containing dsl_dir */ 3652 dmu_buf_will_dirty(ds->ds_dbuf, tx); 3653 ASSERT3U(dsl_dataset_phys(ds)->ds_dir_obj, ==, odd->dd_object); 3654 dsl_dataset_phys(ds)->ds_dir_obj = dd->dd_object; 3655 ASSERT3P(ds->ds_dir, ==, odd); 3656 dsl_dir_rele(ds->ds_dir, ds); 3657 VERIFY0(dsl_dir_hold_obj(dp, dd->dd_object, 3658 NULL, ds, &ds->ds_dir)); 3659 3660 /* move any clone references */ 3661 if (dsl_dataset_phys(ds)->ds_next_clones_obj && 3662 spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 3663 zap_cursor_t zc; 3664 zap_attribute_t za; 3665 3666 for (zap_cursor_init(&zc, dp->dp_meta_objset, 3667 dsl_dataset_phys(ds)->ds_next_clones_obj); 3668 zap_cursor_retrieve(&zc, &za) == 0; 3669 zap_cursor_advance(&zc)) { 3670 dsl_dataset_t *cnds; 3671 uint64_t o; 3672 3673 if (za.za_first_integer == oldnext_obj) { 3674 /* 3675 * We've already moved the 3676 * origin's reference. 3677 */ 3678 continue; 3679 } 3680 3681 VERIFY0(dsl_dataset_hold_obj(dp, 3682 za.za_first_integer, FTAG, &cnds)); 3683 o = dsl_dir_phys(cnds->ds_dir)-> 3684 dd_head_dataset_obj; 3685 3686 VERIFY0(zap_remove_int(dp->dp_meta_objset, 3687 dsl_dir_phys(odd)->dd_clones, o, tx)); 3688 VERIFY0(zap_add_int(dp->dp_meta_objset, 3689 dsl_dir_phys(dd)->dd_clones, o, tx)); 3690 dsl_dataset_rele(cnds, FTAG); 3691 } 3692 zap_cursor_fini(&zc); 3693 } 3694 3695 ASSERT(!dsl_prop_hascb(ds)); 3696 } 3697 3698 /* 3699 * Change space accounting. 3700 * Note, pa->*usedsnap and dd_used_breakdown[SNAP] will either 3701 * both be valid, or both be 0 (resulting in delta == 0). This 3702 * is true for each of {clone,origin} independently. 3703 */ 3704 3705 delta = ddpa->cloneusedsnap - 3706 dsl_dir_phys(dd)->dd_used_breakdown[DD_USED_SNAP]; 3707 ASSERT3S(delta, >=, 0); 3708 ASSERT3U(ddpa->used, >=, delta); 3709 dsl_dir_diduse_space(dd, DD_USED_SNAP, delta, 0, 0, tx); 3710 dsl_dir_diduse_space(dd, DD_USED_HEAD, 3711 ddpa->used - delta, ddpa->comp, ddpa->uncomp, tx); 3712 3713 delta = ddpa->originusedsnap - 3714 dsl_dir_phys(odd)->dd_used_breakdown[DD_USED_SNAP]; 3715 ASSERT3S(delta, <=, 0); 3716 ASSERT3U(ddpa->used, >=, -delta); 3717 dsl_dir_diduse_space(odd, DD_USED_SNAP, delta, 0, 0, tx); 3718 dsl_dir_diduse_space(odd, DD_USED_HEAD, 3719 -ddpa->used - delta, -ddpa->comp, -ddpa->uncomp, tx); 3720 3721 dsl_dataset_phys(origin_ds)->ds_unique_bytes = ddpa->unique; 3722 3723 /* 3724 * Since livelists are specific to a clone's origin txg, they 3725 * are no longer accurate. Destroy the livelist from the clone being 3726 * promoted. If the origin dataset is a clone, destroy its livelist 3727 * as well. 3728 */ 3729 dsl_dir_remove_livelist(dd, tx, B_TRUE); 3730 dsl_dir_remove_livelist(odd, tx, B_TRUE); 3731 3732 /* log history record */ 3733 spa_history_log_internal_ds(hds, "promote", tx, " "); 3734 3735 dsl_dir_rele(odd, FTAG); 3736 promote_rele(ddpa, FTAG); 3737 3738 /* 3739 * Transfer common error blocks from old head to new head. 3740 */ 3741 if (spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_HEAD_ERRLOG)) { 3742 uint64_t old_head = origin_head->ds_object; 3743 uint64_t new_head = hds->ds_object; 3744 spa_swap_errlog(dp->dp_spa, new_head, old_head, tx); 3745 } 3746 } 3747 3748 /* 3749 * Make a list of dsl_dataset_t's for the snapshots between first_obj 3750 * (exclusive) and last_obj (inclusive). The list will be in reverse 3751 * order (last_obj will be the list_head()). If first_obj == 0, do all 3752 * snapshots back to this dataset's origin. 3753 */ 3754 static int 3755 snaplist_make(dsl_pool_t *dp, 3756 uint64_t first_obj, uint64_t last_obj, list_t *l, const void *tag) 3757 { 3758 uint64_t obj = last_obj; 3759 3760 list_create(l, sizeof (struct promotenode), 3761 offsetof(struct promotenode, link)); 3762 3763 while (obj != first_obj) { 3764 dsl_dataset_t *ds; 3765 struct promotenode *snap; 3766 int err; 3767 3768 err = dsl_dataset_hold_obj(dp, obj, tag, &ds); 3769 ASSERT(err != ENOENT); 3770 if (err != 0) 3771 return (err); 3772 3773 if (first_obj == 0) 3774 first_obj = dsl_dir_phys(ds->ds_dir)->dd_origin_obj; 3775 3776 snap = kmem_alloc(sizeof (*snap), KM_SLEEP); 3777 snap->ds = ds; 3778 list_insert_tail(l, snap); 3779 obj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 3780 } 3781 3782 return (0); 3783 } 3784 3785 static int 3786 snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep) 3787 { 3788 struct promotenode *snap; 3789 3790 *spacep = 0; 3791 for (snap = list_head(l); snap; snap = list_next(l, snap)) { 3792 uint64_t used, comp, uncomp; 3793 dsl_deadlist_space_range(&snap->ds->ds_deadlist, 3794 mintxg, UINT64_MAX, &used, &comp, &uncomp); 3795 *spacep += used; 3796 } 3797 return (0); 3798 } 3799 3800 static void 3801 snaplist_destroy(list_t *l, const void *tag) 3802 { 3803 struct promotenode *snap; 3804 3805 if (l == NULL || !list_link_active(&l->list_head)) 3806 return; 3807 3808 while ((snap = list_tail(l)) != NULL) { 3809 list_remove(l, snap); 3810 dsl_dataset_rele(snap->ds, tag); 3811 kmem_free(snap, sizeof (*snap)); 3812 } 3813 list_destroy(l); 3814 } 3815 3816 static int 3817 promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp, const void *tag) 3818 { 3819 int error; 3820 dsl_dir_t *dd; 3821 struct promotenode *snap; 3822 3823 error = dsl_dataset_hold(dp, ddpa->ddpa_clonename, tag, 3824 &ddpa->ddpa_clone); 3825 if (error != 0) 3826 return (error); 3827 dd = ddpa->ddpa_clone->ds_dir; 3828 3829 if (ddpa->ddpa_clone->ds_is_snapshot || 3830 !dsl_dir_is_clone(dd)) { 3831 dsl_dataset_rele(ddpa->ddpa_clone, tag); 3832 return (SET_ERROR(EINVAL)); 3833 } 3834 3835 error = snaplist_make(dp, 0, dsl_dir_phys(dd)->dd_origin_obj, 3836 &ddpa->shared_snaps, tag); 3837 if (error != 0) 3838 goto out; 3839 3840 error = snaplist_make(dp, 0, ddpa->ddpa_clone->ds_object, 3841 &ddpa->clone_snaps, tag); 3842 if (error != 0) 3843 goto out; 3844 3845 snap = list_head(&ddpa->shared_snaps); 3846 ASSERT3U(snap->ds->ds_object, ==, dsl_dir_phys(dd)->dd_origin_obj); 3847 error = snaplist_make(dp, dsl_dir_phys(dd)->dd_origin_obj, 3848 dsl_dir_phys(snap->ds->ds_dir)->dd_head_dataset_obj, 3849 &ddpa->origin_snaps, tag); 3850 if (error != 0) 3851 goto out; 3852 3853 if (dsl_dir_phys(snap->ds->ds_dir)->dd_origin_obj != 0) { 3854 error = dsl_dataset_hold_obj(dp, 3855 dsl_dir_phys(snap->ds->ds_dir)->dd_origin_obj, 3856 tag, &ddpa->origin_origin); 3857 if (error != 0) 3858 goto out; 3859 } 3860 out: 3861 if (error != 0) 3862 promote_rele(ddpa, tag); 3863 return (error); 3864 } 3865 3866 static void 3867 promote_rele(dsl_dataset_promote_arg_t *ddpa, const void *tag) 3868 { 3869 snaplist_destroy(&ddpa->shared_snaps, tag); 3870 snaplist_destroy(&ddpa->clone_snaps, tag); 3871 snaplist_destroy(&ddpa->origin_snaps, tag); 3872 if (ddpa->origin_origin != NULL) 3873 dsl_dataset_rele(ddpa->origin_origin, tag); 3874 dsl_dataset_rele(ddpa->ddpa_clone, tag); 3875 } 3876 3877 /* 3878 * Promote a clone. 3879 * 3880 * If it fails due to a conflicting snapshot name, "conflsnap" will be filled 3881 * in with the name. (It must be at least ZFS_MAX_DATASET_NAME_LEN bytes long.) 3882 */ 3883 int 3884 dsl_dataset_promote(const char *name, char *conflsnap) 3885 { 3886 dsl_dataset_promote_arg_t ddpa = { 0 }; 3887 uint64_t numsnaps; 3888 int error; 3889 nvpair_t *snap_pair; 3890 objset_t *os; 3891 3892 /* 3893 * We will modify space proportional to the number of 3894 * snapshots. Compute numsnaps. 3895 */ 3896 error = dmu_objset_hold(name, FTAG, &os); 3897 if (error != 0) 3898 return (error); 3899 error = zap_count(dmu_objset_pool(os)->dp_meta_objset, 3900 dsl_dataset_phys(dmu_objset_ds(os))->ds_snapnames_zapobj, 3901 &numsnaps); 3902 dmu_objset_rele(os, FTAG); 3903 if (error != 0) 3904 return (error); 3905 3906 ddpa.ddpa_clonename = name; 3907 ddpa.err_ds = fnvlist_alloc(); 3908 ddpa.cr = CRED(); 3909 ddpa.proc = curproc; 3910 3911 error = dsl_sync_task(name, dsl_dataset_promote_check, 3912 dsl_dataset_promote_sync, &ddpa, 3913 2 + numsnaps, ZFS_SPACE_CHECK_RESERVED); 3914 3915 /* 3916 * Return the first conflicting snapshot found. 3917 */ 3918 snap_pair = nvlist_next_nvpair(ddpa.err_ds, NULL); 3919 if (snap_pair != NULL && conflsnap != NULL) 3920 (void) strlcpy(conflsnap, nvpair_name(snap_pair), 3921 ZFS_MAX_DATASET_NAME_LEN); 3922 3923 fnvlist_free(ddpa.err_ds); 3924 return (error); 3925 } 3926 3927 int 3928 dsl_dataset_clone_swap_check_impl(dsl_dataset_t *clone, 3929 dsl_dataset_t *origin_head, boolean_t force, void *owner, dmu_tx_t *tx) 3930 { 3931 /* 3932 * "slack" factor for received datasets with refquota set on them. 3933 * See the bottom of this function for details on its use. 3934 */ 3935 uint64_t refquota_slack = (uint64_t)DMU_MAX_ACCESS * 3936 spa_asize_inflation; 3937 int64_t unused_refres_delta; 3938 3939 /* they should both be heads */ 3940 if (clone->ds_is_snapshot || 3941 origin_head->ds_is_snapshot) 3942 return (SET_ERROR(EINVAL)); 3943 3944 /* if we are not forcing, the branch point should be just before them */ 3945 if (!force && clone->ds_prev != origin_head->ds_prev) 3946 return (SET_ERROR(EINVAL)); 3947 3948 /* clone should be the clone (unless they are unrelated) */ 3949 if (clone->ds_prev != NULL && 3950 clone->ds_prev != clone->ds_dir->dd_pool->dp_origin_snap && 3951 origin_head->ds_dir != clone->ds_prev->ds_dir) 3952 return (SET_ERROR(EINVAL)); 3953 3954 /* the clone should be a child of the origin */ 3955 if (clone->ds_dir->dd_parent != origin_head->ds_dir) 3956 return (SET_ERROR(EINVAL)); 3957 3958 /* origin_head shouldn't be modified unless 'force' */ 3959 if (!force && 3960 dsl_dataset_modified_since_snap(origin_head, origin_head->ds_prev)) 3961 return (SET_ERROR(ETXTBSY)); 3962 3963 /* origin_head should have no long holds (e.g. is not mounted) */ 3964 if (dsl_dataset_handoff_check(origin_head, owner, tx)) 3965 return (SET_ERROR(EBUSY)); 3966 3967 /* check amount of any unconsumed refreservation */ 3968 unused_refres_delta = 3969 (int64_t)MIN(origin_head->ds_reserved, 3970 dsl_dataset_phys(origin_head)->ds_unique_bytes) - 3971 (int64_t)MIN(origin_head->ds_reserved, 3972 dsl_dataset_phys(clone)->ds_unique_bytes); 3973 3974 if (unused_refres_delta > 0 && 3975 unused_refres_delta > 3976 dsl_dir_space_available(origin_head->ds_dir, NULL, 0, TRUE)) 3977 return (SET_ERROR(ENOSPC)); 3978 3979 /* 3980 * The clone can't be too much over the head's refquota. 3981 * 3982 * To ensure that the entire refquota can be used, we allow one 3983 * transaction to exceed the refquota. Therefore, this check 3984 * needs to also allow for the space referenced to be more than the 3985 * refquota. The maximum amount of space that one transaction can use 3986 * on disk is DMU_MAX_ACCESS * spa_asize_inflation. Allowing this 3987 * overage ensures that we are able to receive a filesystem that 3988 * exceeds the refquota on the source system. 3989 * 3990 * So that overage is the refquota_slack we use below. 3991 */ 3992 if (origin_head->ds_quota != 0 && 3993 dsl_dataset_phys(clone)->ds_referenced_bytes > 3994 origin_head->ds_quota + refquota_slack) 3995 return (SET_ERROR(EDQUOT)); 3996 3997 return (0); 3998 } 3999 4000 static void 4001 dsl_dataset_swap_remap_deadlists(dsl_dataset_t *clone, 4002 dsl_dataset_t *origin, dmu_tx_t *tx) 4003 { 4004 uint64_t clone_remap_dl_obj, origin_remap_dl_obj; 4005 dsl_pool_t *dp = dmu_tx_pool(tx); 4006 4007 ASSERT(dsl_pool_sync_context(dp)); 4008 4009 clone_remap_dl_obj = dsl_dataset_get_remap_deadlist_object(clone); 4010 origin_remap_dl_obj = dsl_dataset_get_remap_deadlist_object(origin); 4011 4012 if (clone_remap_dl_obj != 0) { 4013 dsl_deadlist_close(&clone->ds_remap_deadlist); 4014 dsl_dataset_unset_remap_deadlist_object(clone, tx); 4015 } 4016 if (origin_remap_dl_obj != 0) { 4017 dsl_deadlist_close(&origin->ds_remap_deadlist); 4018 dsl_dataset_unset_remap_deadlist_object(origin, tx); 4019 } 4020 4021 if (clone_remap_dl_obj != 0) { 4022 dsl_dataset_set_remap_deadlist_object(origin, 4023 clone_remap_dl_obj, tx); 4024 dsl_deadlist_open(&origin->ds_remap_deadlist, 4025 dp->dp_meta_objset, clone_remap_dl_obj); 4026 } 4027 if (origin_remap_dl_obj != 0) { 4028 dsl_dataset_set_remap_deadlist_object(clone, 4029 origin_remap_dl_obj, tx); 4030 dsl_deadlist_open(&clone->ds_remap_deadlist, 4031 dp->dp_meta_objset, origin_remap_dl_obj); 4032 } 4033 } 4034 4035 void 4036 dsl_dataset_clone_swap_sync_impl(dsl_dataset_t *clone, 4037 dsl_dataset_t *origin_head, dmu_tx_t *tx) 4038 { 4039 dsl_pool_t *dp = dmu_tx_pool(tx); 4040 int64_t unused_refres_delta; 4041 4042 ASSERT(clone->ds_reserved == 0); 4043 /* 4044 * NOTE: On DEBUG kernels there could be a race between this and 4045 * the check function if spa_asize_inflation is adjusted... 4046 */ 4047 ASSERT(origin_head->ds_quota == 0 || 4048 dsl_dataset_phys(clone)->ds_unique_bytes <= origin_head->ds_quota + 4049 DMU_MAX_ACCESS * spa_asize_inflation); 4050 ASSERT3P(clone->ds_prev, ==, origin_head->ds_prev); 4051 4052 dsl_dir_cancel_waiters(origin_head->ds_dir); 4053 4054 /* 4055 * Swap per-dataset feature flags. 4056 */ 4057 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 4058 if (!(spa_feature_table[f].fi_flags & 4059 ZFEATURE_FLAG_PER_DATASET)) { 4060 ASSERT(!dsl_dataset_feature_is_active(clone, f)); 4061 ASSERT(!dsl_dataset_feature_is_active(origin_head, f)); 4062 continue; 4063 } 4064 4065 boolean_t clone_inuse = dsl_dataset_feature_is_active(clone, f); 4066 void *clone_feature = clone->ds_feature[f]; 4067 boolean_t origin_head_inuse = 4068 dsl_dataset_feature_is_active(origin_head, f); 4069 void *origin_head_feature = origin_head->ds_feature[f]; 4070 4071 if (clone_inuse) 4072 dsl_dataset_deactivate_feature_impl(clone, f, tx); 4073 if (origin_head_inuse) 4074 dsl_dataset_deactivate_feature_impl(origin_head, f, tx); 4075 4076 if (clone_inuse) { 4077 dsl_dataset_activate_feature(origin_head->ds_object, f, 4078 clone_feature, tx); 4079 origin_head->ds_feature[f] = clone_feature; 4080 } 4081 if (origin_head_inuse) { 4082 dsl_dataset_activate_feature(clone->ds_object, f, 4083 origin_head_feature, tx); 4084 clone->ds_feature[f] = origin_head_feature; 4085 } 4086 } 4087 4088 dmu_buf_will_dirty(clone->ds_dbuf, tx); 4089 dmu_buf_will_dirty(origin_head->ds_dbuf, tx); 4090 4091 if (clone->ds_objset != NULL) { 4092 dmu_objset_evict(clone->ds_objset); 4093 clone->ds_objset = NULL; 4094 } 4095 4096 if (origin_head->ds_objset != NULL) { 4097 dmu_objset_evict(origin_head->ds_objset); 4098 origin_head->ds_objset = NULL; 4099 } 4100 4101 unused_refres_delta = 4102 (int64_t)MIN(origin_head->ds_reserved, 4103 dsl_dataset_phys(origin_head)->ds_unique_bytes) - 4104 (int64_t)MIN(origin_head->ds_reserved, 4105 dsl_dataset_phys(clone)->ds_unique_bytes); 4106 4107 /* 4108 * Reset origin's unique bytes. 4109 */ 4110 { 4111 dsl_dataset_t *origin = clone->ds_prev; 4112 uint64_t comp, uncomp; 4113 4114 dmu_buf_will_dirty(origin->ds_dbuf, tx); 4115 dsl_deadlist_space_range(&clone->ds_deadlist, 4116 dsl_dataset_phys(origin)->ds_prev_snap_txg, UINT64_MAX, 4117 &dsl_dataset_phys(origin)->ds_unique_bytes, &comp, &uncomp); 4118 } 4119 4120 /* swap blkptrs */ 4121 { 4122 rrw_enter(&clone->ds_bp_rwlock, RW_WRITER, FTAG); 4123 rrw_enter(&origin_head->ds_bp_rwlock, RW_WRITER, FTAG); 4124 blkptr_t tmp; 4125 tmp = dsl_dataset_phys(origin_head)->ds_bp; 4126 dsl_dataset_phys(origin_head)->ds_bp = 4127 dsl_dataset_phys(clone)->ds_bp; 4128 dsl_dataset_phys(clone)->ds_bp = tmp; 4129 rrw_exit(&origin_head->ds_bp_rwlock, FTAG); 4130 rrw_exit(&clone->ds_bp_rwlock, FTAG); 4131 } 4132 4133 /* set dd_*_bytes */ 4134 { 4135 int64_t dused, dcomp, duncomp; 4136 uint64_t cdl_used, cdl_comp, cdl_uncomp; 4137 uint64_t odl_used, odl_comp, odl_uncomp; 4138 4139 ASSERT3U(dsl_dir_phys(clone->ds_dir)-> 4140 dd_used_breakdown[DD_USED_SNAP], ==, 0); 4141 4142 dsl_deadlist_space(&clone->ds_deadlist, 4143 &cdl_used, &cdl_comp, &cdl_uncomp); 4144 dsl_deadlist_space(&origin_head->ds_deadlist, 4145 &odl_used, &odl_comp, &odl_uncomp); 4146 4147 dused = dsl_dataset_phys(clone)->ds_referenced_bytes + 4148 cdl_used - 4149 (dsl_dataset_phys(origin_head)->ds_referenced_bytes + 4150 odl_used); 4151 dcomp = dsl_dataset_phys(clone)->ds_compressed_bytes + 4152 cdl_comp - 4153 (dsl_dataset_phys(origin_head)->ds_compressed_bytes + 4154 odl_comp); 4155 duncomp = dsl_dataset_phys(clone)->ds_uncompressed_bytes + 4156 cdl_uncomp - 4157 (dsl_dataset_phys(origin_head)->ds_uncompressed_bytes + 4158 odl_uncomp); 4159 4160 dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_HEAD, 4161 dused, dcomp, duncomp, tx); 4162 dsl_dir_diduse_space(clone->ds_dir, DD_USED_HEAD, 4163 -dused, -dcomp, -duncomp, tx); 4164 4165 /* 4166 * The difference in the space used by snapshots is the 4167 * difference in snapshot space due to the head's 4168 * deadlist (since that's the only thing that's 4169 * changing that affects the snapused). 4170 */ 4171 dsl_deadlist_space_range(&clone->ds_deadlist, 4172 origin_head->ds_dir->dd_origin_txg, UINT64_MAX, 4173 &cdl_used, &cdl_comp, &cdl_uncomp); 4174 dsl_deadlist_space_range(&origin_head->ds_deadlist, 4175 origin_head->ds_dir->dd_origin_txg, UINT64_MAX, 4176 &odl_used, &odl_comp, &odl_uncomp); 4177 dsl_dir_transfer_space(origin_head->ds_dir, cdl_used - odl_used, 4178 DD_USED_HEAD, DD_USED_SNAP, tx); 4179 } 4180 4181 /* swap ds_*_bytes */ 4182 SWITCH64(dsl_dataset_phys(origin_head)->ds_referenced_bytes, 4183 dsl_dataset_phys(clone)->ds_referenced_bytes); 4184 SWITCH64(dsl_dataset_phys(origin_head)->ds_compressed_bytes, 4185 dsl_dataset_phys(clone)->ds_compressed_bytes); 4186 SWITCH64(dsl_dataset_phys(origin_head)->ds_uncompressed_bytes, 4187 dsl_dataset_phys(clone)->ds_uncompressed_bytes); 4188 SWITCH64(dsl_dataset_phys(origin_head)->ds_unique_bytes, 4189 dsl_dataset_phys(clone)->ds_unique_bytes); 4190 4191 /* apply any parent delta for change in unconsumed refreservation */ 4192 dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_REFRSRV, 4193 unused_refres_delta, 0, 0, tx); 4194 4195 /* 4196 * Swap deadlists. 4197 */ 4198 dsl_deadlist_close(&clone->ds_deadlist); 4199 dsl_deadlist_close(&origin_head->ds_deadlist); 4200 SWITCH64(dsl_dataset_phys(origin_head)->ds_deadlist_obj, 4201 dsl_dataset_phys(clone)->ds_deadlist_obj); 4202 dsl_deadlist_open(&clone->ds_deadlist, dp->dp_meta_objset, 4203 dsl_dataset_phys(clone)->ds_deadlist_obj); 4204 dsl_deadlist_open(&origin_head->ds_deadlist, dp->dp_meta_objset, 4205 dsl_dataset_phys(origin_head)->ds_deadlist_obj); 4206 dsl_dataset_swap_remap_deadlists(clone, origin_head, tx); 4207 4208 /* 4209 * If there is a bookmark at the origin, its "next dataset" is 4210 * changing, so we need to reset its FBN. 4211 */ 4212 dsl_bookmark_next_changed(origin_head, origin_head->ds_prev, tx); 4213 4214 dsl_scan_ds_clone_swapped(origin_head, clone, tx); 4215 4216 /* 4217 * Destroy any livelists associated with the clone or the origin, 4218 * since after the swap the corresponding livelists are no longer 4219 * valid. 4220 */ 4221 dsl_dir_remove_livelist(clone->ds_dir, tx, B_TRUE); 4222 dsl_dir_remove_livelist(origin_head->ds_dir, tx, B_TRUE); 4223 4224 spa_history_log_internal_ds(clone, "clone swap", tx, 4225 "parent=%s", origin_head->ds_dir->dd_myname); 4226 } 4227 4228 /* 4229 * Given a pool name and a dataset object number in that pool, 4230 * return the name of that dataset. 4231 */ 4232 int 4233 dsl_dsobj_to_dsname(char *pname, uint64_t obj, char *buf) 4234 { 4235 dsl_pool_t *dp; 4236 dsl_dataset_t *ds; 4237 int error; 4238 4239 error = dsl_pool_hold(pname, FTAG, &dp); 4240 if (error != 0) 4241 return (error); 4242 4243 error = dsl_dataset_hold_obj(dp, obj, FTAG, &ds); 4244 if (error == 0) { 4245 dsl_dataset_name(ds, buf); 4246 dsl_dataset_rele(ds, FTAG); 4247 } 4248 dsl_pool_rele(dp, FTAG); 4249 4250 return (error); 4251 } 4252 4253 int 4254 dsl_dataset_check_quota(dsl_dataset_t *ds, boolean_t check_quota, 4255 uint64_t asize, uint64_t inflight, uint64_t *used, uint64_t *ref_rsrv) 4256 { 4257 int error = 0; 4258 4259 ASSERT3S(asize, >, 0); 4260 4261 /* 4262 * *ref_rsrv is the portion of asize that will come from any 4263 * unconsumed refreservation space. 4264 */ 4265 *ref_rsrv = 0; 4266 4267 mutex_enter(&ds->ds_lock); 4268 /* 4269 * Make a space adjustment for reserved bytes. 4270 */ 4271 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes) { 4272 ASSERT3U(*used, >=, 4273 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes); 4274 *used -= 4275 (ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes); 4276 *ref_rsrv = 4277 asize - MIN(asize, parent_delta(ds, asize + inflight)); 4278 } 4279 4280 if (!check_quota || ds->ds_quota == 0) { 4281 mutex_exit(&ds->ds_lock); 4282 return (0); 4283 } 4284 /* 4285 * If they are requesting more space, and our current estimate 4286 * is over quota, they get to try again unless the actual 4287 * on-disk is over quota and there are no pending changes (which 4288 * may free up space for us). 4289 */ 4290 if (dsl_dataset_phys(ds)->ds_referenced_bytes + inflight >= 4291 ds->ds_quota) { 4292 if (inflight > 0 || 4293 dsl_dataset_phys(ds)->ds_referenced_bytes < ds->ds_quota) 4294 error = SET_ERROR(ERESTART); 4295 else 4296 error = SET_ERROR(EDQUOT); 4297 } 4298 mutex_exit(&ds->ds_lock); 4299 4300 return (error); 4301 } 4302 4303 typedef struct dsl_dataset_set_qr_arg { 4304 const char *ddsqra_name; 4305 zprop_source_t ddsqra_source; 4306 uint64_t ddsqra_value; 4307 } dsl_dataset_set_qr_arg_t; 4308 4309 4310 static int 4311 dsl_dataset_set_refquota_check(void *arg, dmu_tx_t *tx) 4312 { 4313 dsl_dataset_set_qr_arg_t *ddsqra = arg; 4314 dsl_pool_t *dp = dmu_tx_pool(tx); 4315 dsl_dataset_t *ds; 4316 int error; 4317 uint64_t newval; 4318 4319 if (spa_version(dp->dp_spa) < SPA_VERSION_REFQUOTA) 4320 return (SET_ERROR(ENOTSUP)); 4321 4322 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds); 4323 if (error != 0) 4324 return (error); 4325 4326 if (ds->ds_is_snapshot) { 4327 dsl_dataset_rele(ds, FTAG); 4328 return (SET_ERROR(EINVAL)); 4329 } 4330 4331 error = dsl_prop_predict(ds->ds_dir, 4332 zfs_prop_to_name(ZFS_PROP_REFQUOTA), 4333 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval); 4334 if (error != 0) { 4335 dsl_dataset_rele(ds, FTAG); 4336 return (error); 4337 } 4338 4339 if (newval == 0) { 4340 dsl_dataset_rele(ds, FTAG); 4341 return (0); 4342 } 4343 4344 if (newval < dsl_dataset_phys(ds)->ds_referenced_bytes || 4345 newval < ds->ds_reserved) { 4346 dsl_dataset_rele(ds, FTAG); 4347 return (SET_ERROR(ENOSPC)); 4348 } 4349 4350 dsl_dataset_rele(ds, FTAG); 4351 return (0); 4352 } 4353 4354 static void 4355 dsl_dataset_set_refquota_sync(void *arg, dmu_tx_t *tx) 4356 { 4357 dsl_dataset_set_qr_arg_t *ddsqra = arg; 4358 dsl_pool_t *dp = dmu_tx_pool(tx); 4359 dsl_dataset_t *ds = NULL; 4360 uint64_t newval; 4361 4362 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds)); 4363 4364 dsl_prop_set_sync_impl(ds, 4365 zfs_prop_to_name(ZFS_PROP_REFQUOTA), 4366 ddsqra->ddsqra_source, sizeof (ddsqra->ddsqra_value), 1, 4367 &ddsqra->ddsqra_value, tx); 4368 4369 VERIFY0(dsl_prop_get_int_ds(ds, 4370 zfs_prop_to_name(ZFS_PROP_REFQUOTA), &newval)); 4371 4372 if (ds->ds_quota != newval) { 4373 dmu_buf_will_dirty(ds->ds_dbuf, tx); 4374 ds->ds_quota = newval; 4375 } 4376 dsl_dataset_rele(ds, FTAG); 4377 } 4378 4379 int 4380 dsl_dataset_set_refquota(const char *dsname, zprop_source_t source, 4381 uint64_t refquota) 4382 { 4383 dsl_dataset_set_qr_arg_t ddsqra; 4384 4385 ddsqra.ddsqra_name = dsname; 4386 ddsqra.ddsqra_source = source; 4387 ddsqra.ddsqra_value = refquota; 4388 4389 return (dsl_sync_task(dsname, dsl_dataset_set_refquota_check, 4390 dsl_dataset_set_refquota_sync, &ddsqra, 0, 4391 ZFS_SPACE_CHECK_EXTRA_RESERVED)); 4392 } 4393 4394 static int 4395 dsl_dataset_set_refreservation_check(void *arg, dmu_tx_t *tx) 4396 { 4397 dsl_dataset_set_qr_arg_t *ddsqra = arg; 4398 dsl_pool_t *dp = dmu_tx_pool(tx); 4399 dsl_dataset_t *ds; 4400 int error; 4401 uint64_t newval, unique; 4402 4403 if (spa_version(dp->dp_spa) < SPA_VERSION_REFRESERVATION) 4404 return (SET_ERROR(ENOTSUP)); 4405 4406 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds); 4407 if (error != 0) 4408 return (error); 4409 4410 if (ds->ds_is_snapshot) { 4411 dsl_dataset_rele(ds, FTAG); 4412 return (SET_ERROR(EINVAL)); 4413 } 4414 4415 error = dsl_prop_predict(ds->ds_dir, 4416 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 4417 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval); 4418 if (error != 0) { 4419 dsl_dataset_rele(ds, FTAG); 4420 return (error); 4421 } 4422 4423 /* 4424 * If we are doing the preliminary check in open context, the 4425 * space estimates may be inaccurate. 4426 */ 4427 if (!dmu_tx_is_syncing(tx)) { 4428 dsl_dataset_rele(ds, FTAG); 4429 return (0); 4430 } 4431 4432 mutex_enter(&ds->ds_lock); 4433 if (!DS_UNIQUE_IS_ACCURATE(ds)) 4434 dsl_dataset_recalc_head_uniq(ds); 4435 unique = dsl_dataset_phys(ds)->ds_unique_bytes; 4436 mutex_exit(&ds->ds_lock); 4437 4438 if (MAX(unique, newval) > MAX(unique, ds->ds_reserved)) { 4439 uint64_t delta = MAX(unique, newval) - 4440 MAX(unique, ds->ds_reserved); 4441 4442 if (delta > 4443 dsl_dir_space_available(ds->ds_dir, NULL, 0, B_TRUE) || 4444 (ds->ds_quota > 0 && newval > ds->ds_quota)) { 4445 dsl_dataset_rele(ds, FTAG); 4446 return (SET_ERROR(ENOSPC)); 4447 } 4448 } 4449 4450 dsl_dataset_rele(ds, FTAG); 4451 return (0); 4452 } 4453 4454 void 4455 dsl_dataset_set_refreservation_sync_impl(dsl_dataset_t *ds, 4456 zprop_source_t source, uint64_t value, dmu_tx_t *tx) 4457 { 4458 uint64_t newval; 4459 uint64_t unique; 4460 int64_t delta; 4461 4462 dsl_prop_set_sync_impl(ds, zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 4463 source, sizeof (value), 1, &value, tx); 4464 4465 VERIFY0(dsl_prop_get_int_ds(ds, 4466 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), &newval)); 4467 4468 dmu_buf_will_dirty(ds->ds_dbuf, tx); 4469 mutex_enter(&ds->ds_dir->dd_lock); 4470 mutex_enter(&ds->ds_lock); 4471 ASSERT(DS_UNIQUE_IS_ACCURATE(ds)); 4472 unique = dsl_dataset_phys(ds)->ds_unique_bytes; 4473 delta = MAX(0, (int64_t)(newval - unique)) - 4474 MAX(0, (int64_t)(ds->ds_reserved - unique)); 4475 ds->ds_reserved = newval; 4476 mutex_exit(&ds->ds_lock); 4477 4478 dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV, delta, 0, 0, tx); 4479 mutex_exit(&ds->ds_dir->dd_lock); 4480 } 4481 4482 static void 4483 dsl_dataset_set_refreservation_sync(void *arg, dmu_tx_t *tx) 4484 { 4485 dsl_dataset_set_qr_arg_t *ddsqra = arg; 4486 dsl_pool_t *dp = dmu_tx_pool(tx); 4487 dsl_dataset_t *ds = NULL; 4488 4489 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds)); 4490 dsl_dataset_set_refreservation_sync_impl(ds, 4491 ddsqra->ddsqra_source, ddsqra->ddsqra_value, tx); 4492 dsl_dataset_rele(ds, FTAG); 4493 } 4494 4495 int 4496 dsl_dataset_set_refreservation(const char *dsname, zprop_source_t source, 4497 uint64_t refreservation) 4498 { 4499 dsl_dataset_set_qr_arg_t ddsqra; 4500 4501 ddsqra.ddsqra_name = dsname; 4502 ddsqra.ddsqra_source = source; 4503 ddsqra.ddsqra_value = refreservation; 4504 4505 return (dsl_sync_task(dsname, dsl_dataset_set_refreservation_check, 4506 dsl_dataset_set_refreservation_sync, &ddsqra, 0, 4507 ZFS_SPACE_CHECK_EXTRA_RESERVED)); 4508 } 4509 4510 typedef struct dsl_dataset_set_compression_arg { 4511 const char *ddsca_name; 4512 zprop_source_t ddsca_source; 4513 uint64_t ddsca_value; 4514 } dsl_dataset_set_compression_arg_t; 4515 4516 static int 4517 dsl_dataset_set_compression_check(void *arg, dmu_tx_t *tx) 4518 { 4519 dsl_dataset_set_compression_arg_t *ddsca = arg; 4520 dsl_pool_t *dp = dmu_tx_pool(tx); 4521 4522 uint64_t compval = ZIO_COMPRESS_ALGO(ddsca->ddsca_value); 4523 spa_feature_t f = zio_compress_to_feature(compval); 4524 4525 if (f == SPA_FEATURE_NONE) 4526 return (SET_ERROR(EINVAL)); 4527 4528 if (!spa_feature_is_enabled(dp->dp_spa, f)) 4529 return (SET_ERROR(ENOTSUP)); 4530 4531 return (0); 4532 } 4533 4534 static void 4535 dsl_dataset_set_compression_sync(void *arg, dmu_tx_t *tx) 4536 { 4537 dsl_dataset_set_compression_arg_t *ddsca = arg; 4538 dsl_pool_t *dp = dmu_tx_pool(tx); 4539 dsl_dataset_t *ds = NULL; 4540 4541 uint64_t compval = ZIO_COMPRESS_ALGO(ddsca->ddsca_value); 4542 spa_feature_t f = zio_compress_to_feature(compval); 4543 ASSERT3S(f, !=, SPA_FEATURE_NONE); 4544 ASSERT3S(spa_feature_table[f].fi_type, ==, ZFEATURE_TYPE_BOOLEAN); 4545 4546 VERIFY0(dsl_dataset_hold(dp, ddsca->ddsca_name, FTAG, &ds)); 4547 if (zfeature_active(f, ds->ds_feature[f]) != B_TRUE) { 4548 ds->ds_feature_activation[f] = (void *)B_TRUE; 4549 dsl_dataset_activate_feature(ds->ds_object, f, 4550 ds->ds_feature_activation[f], tx); 4551 ds->ds_feature[f] = ds->ds_feature_activation[f]; 4552 } 4553 dsl_dataset_rele(ds, FTAG); 4554 } 4555 4556 int 4557 dsl_dataset_set_compression(const char *dsname, zprop_source_t source, 4558 uint64_t compression) 4559 { 4560 dsl_dataset_set_compression_arg_t ddsca; 4561 4562 /* 4563 * The sync task is only required for zstd in order to activate 4564 * the feature flag when the property is first set. 4565 */ 4566 if (ZIO_COMPRESS_ALGO(compression) != ZIO_COMPRESS_ZSTD) 4567 return (0); 4568 4569 ddsca.ddsca_name = dsname; 4570 ddsca.ddsca_source = source; 4571 ddsca.ddsca_value = compression; 4572 4573 return (dsl_sync_task(dsname, dsl_dataset_set_compression_check, 4574 dsl_dataset_set_compression_sync, &ddsca, 0, 4575 ZFS_SPACE_CHECK_EXTRA_RESERVED)); 4576 } 4577 4578 /* 4579 * Return (in *usedp) the amount of space referenced by "new" that was not 4580 * referenced at the time the bookmark corresponds to. "New" may be a 4581 * snapshot or a head. The bookmark must be before new, in 4582 * new's filesystem (or its origin) -- caller verifies this. 4583 * 4584 * The written space is calculated by considering two components: First, we 4585 * ignore any freed space, and calculate the written as new's used space 4586 * minus old's used space. Next, we add in the amount of space that was freed 4587 * between the two time points, thus reducing new's used space relative to 4588 * old's. Specifically, this is the space that was born before 4589 * zbm_creation_txg, and freed before new (ie. on new's deadlist or a 4590 * previous deadlist). 4591 * 4592 * space freed [---------------------] 4593 * snapshots ---O-------O--------O-------O------ 4594 * bookmark new 4595 * 4596 * Note, the bookmark's zbm_*_bytes_refd must be valid, but if the HAS_FBN 4597 * flag is not set, we will calculate the freed_before_next based on the 4598 * next snapshot's deadlist, rather than using zbm_*_freed_before_next_snap. 4599 */ 4600 static int 4601 dsl_dataset_space_written_impl(zfs_bookmark_phys_t *bmp, 4602 dsl_dataset_t *new, uint64_t *usedp, uint64_t *compp, uint64_t *uncompp) 4603 { 4604 int err = 0; 4605 dsl_pool_t *dp = new->ds_dir->dd_pool; 4606 4607 ASSERT(dsl_pool_config_held(dp)); 4608 if (dsl_dataset_is_snapshot(new)) { 4609 ASSERT3U(bmp->zbm_creation_txg, <, 4610 dsl_dataset_phys(new)->ds_creation_txg); 4611 } 4612 4613 *usedp = 0; 4614 *usedp += dsl_dataset_phys(new)->ds_referenced_bytes; 4615 *usedp -= bmp->zbm_referenced_bytes_refd; 4616 4617 *compp = 0; 4618 *compp += dsl_dataset_phys(new)->ds_compressed_bytes; 4619 *compp -= bmp->zbm_compressed_bytes_refd; 4620 4621 *uncompp = 0; 4622 *uncompp += dsl_dataset_phys(new)->ds_uncompressed_bytes; 4623 *uncompp -= bmp->zbm_uncompressed_bytes_refd; 4624 4625 dsl_dataset_t *snap = new; 4626 4627 while (dsl_dataset_phys(snap)->ds_prev_snap_txg > 4628 bmp->zbm_creation_txg) { 4629 uint64_t used, comp, uncomp; 4630 4631 dsl_deadlist_space_range(&snap->ds_deadlist, 4632 0, bmp->zbm_creation_txg, 4633 &used, &comp, &uncomp); 4634 *usedp += used; 4635 *compp += comp; 4636 *uncompp += uncomp; 4637 4638 uint64_t snapobj = dsl_dataset_phys(snap)->ds_prev_snap_obj; 4639 if (snap != new) 4640 dsl_dataset_rele(snap, FTAG); 4641 err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &snap); 4642 if (err != 0) 4643 break; 4644 } 4645 4646 /* 4647 * We might not have the FBN if we are calculating written from 4648 * a snapshot (because we didn't know the correct "next" snapshot 4649 * until now). 4650 */ 4651 if (bmp->zbm_flags & ZBM_FLAG_HAS_FBN) { 4652 *usedp += bmp->zbm_referenced_freed_before_next_snap; 4653 *compp += bmp->zbm_compressed_freed_before_next_snap; 4654 *uncompp += bmp->zbm_uncompressed_freed_before_next_snap; 4655 } else { 4656 ASSERT3U(dsl_dataset_phys(snap)->ds_prev_snap_txg, ==, 4657 bmp->zbm_creation_txg); 4658 uint64_t used, comp, uncomp; 4659 dsl_deadlist_space(&snap->ds_deadlist, &used, &comp, &uncomp); 4660 *usedp += used; 4661 *compp += comp; 4662 *uncompp += uncomp; 4663 } 4664 if (snap != new) 4665 dsl_dataset_rele(snap, FTAG); 4666 return (err); 4667 } 4668 4669 /* 4670 * Return (in *usedp) the amount of space written in new that was not 4671 * present at the time the bookmark corresponds to. New may be a 4672 * snapshot or the head. Old must be a bookmark before new, in 4673 * new's filesystem (or its origin) -- caller verifies this. 4674 */ 4675 int 4676 dsl_dataset_space_written_bookmark(zfs_bookmark_phys_t *bmp, 4677 dsl_dataset_t *new, uint64_t *usedp, uint64_t *compp, uint64_t *uncompp) 4678 { 4679 if (!(bmp->zbm_flags & ZBM_FLAG_HAS_FBN)) 4680 return (SET_ERROR(ENOTSUP)); 4681 return (dsl_dataset_space_written_impl(bmp, new, 4682 usedp, compp, uncompp)); 4683 } 4684 4685 /* 4686 * Return (in *usedp) the amount of space written in new that is not 4687 * present in oldsnap. New may be a snapshot or the head. Old must be 4688 * a snapshot before new, in new's filesystem (or its origin). If not then 4689 * fail and return EINVAL. 4690 */ 4691 int 4692 dsl_dataset_space_written(dsl_dataset_t *oldsnap, dsl_dataset_t *new, 4693 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp) 4694 { 4695 if (!dsl_dataset_is_before(new, oldsnap, 0)) 4696 return (SET_ERROR(EINVAL)); 4697 4698 zfs_bookmark_phys_t zbm = { 0 }; 4699 dsl_dataset_phys_t *dsp = dsl_dataset_phys(oldsnap); 4700 zbm.zbm_guid = dsp->ds_guid; 4701 zbm.zbm_creation_txg = dsp->ds_creation_txg; 4702 zbm.zbm_creation_time = dsp->ds_creation_time; 4703 zbm.zbm_referenced_bytes_refd = dsp->ds_referenced_bytes; 4704 zbm.zbm_compressed_bytes_refd = dsp->ds_compressed_bytes; 4705 zbm.zbm_uncompressed_bytes_refd = dsp->ds_uncompressed_bytes; 4706 4707 /* 4708 * If oldsnap is the origin (or origin's origin, ...) of new, 4709 * we can't easily calculate the effective FBN. Therefore, 4710 * we do not set ZBM_FLAG_HAS_FBN, so that the _impl will calculate 4711 * it relative to the correct "next": the next snapshot towards "new", 4712 * rather than the next snapshot in oldsnap's dsl_dir. 4713 */ 4714 return (dsl_dataset_space_written_impl(&zbm, new, 4715 usedp, compp, uncompp)); 4716 } 4717 4718 /* 4719 * Return (in *usedp) the amount of space that will be reclaimed if firstsnap, 4720 * lastsnap, and all snapshots in between are deleted. 4721 * 4722 * blocks that would be freed [---------------------------] 4723 * snapshots ---O-------O--------O-------O--------O 4724 * firstsnap lastsnap 4725 * 4726 * This is the set of blocks that were born after the snap before firstsnap, 4727 * (birth > firstsnap->prev_snap_txg) and died before the snap after the 4728 * last snap (ie, is on lastsnap->ds_next->ds_deadlist or an earlier deadlist). 4729 * We calculate this by iterating over the relevant deadlists (from the snap 4730 * after lastsnap, backward to the snap after firstsnap), summing up the 4731 * space on the deadlist that was born after the snap before firstsnap. 4732 */ 4733 int 4734 dsl_dataset_space_wouldfree(dsl_dataset_t *firstsnap, 4735 dsl_dataset_t *lastsnap, 4736 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp) 4737 { 4738 int err = 0; 4739 uint64_t snapobj; 4740 dsl_pool_t *dp = firstsnap->ds_dir->dd_pool; 4741 4742 ASSERT(firstsnap->ds_is_snapshot); 4743 ASSERT(lastsnap->ds_is_snapshot); 4744 4745 /* 4746 * Check that the snapshots are in the same dsl_dir, and firstsnap 4747 * is before lastsnap. 4748 */ 4749 if (firstsnap->ds_dir != lastsnap->ds_dir || 4750 dsl_dataset_phys(firstsnap)->ds_creation_txg > 4751 dsl_dataset_phys(lastsnap)->ds_creation_txg) 4752 return (SET_ERROR(EINVAL)); 4753 4754 *usedp = *compp = *uncompp = 0; 4755 4756 snapobj = dsl_dataset_phys(lastsnap)->ds_next_snap_obj; 4757 while (snapobj != firstsnap->ds_object) { 4758 dsl_dataset_t *ds; 4759 uint64_t used, comp, uncomp; 4760 4761 err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &ds); 4762 if (err != 0) 4763 break; 4764 4765 dsl_deadlist_space_range(&ds->ds_deadlist, 4766 dsl_dataset_phys(firstsnap)->ds_prev_snap_txg, UINT64_MAX, 4767 &used, &comp, &uncomp); 4768 *usedp += used; 4769 *compp += comp; 4770 *uncompp += uncomp; 4771 4772 snapobj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 4773 ASSERT3U(snapobj, !=, 0); 4774 dsl_dataset_rele(ds, FTAG); 4775 } 4776 return (err); 4777 } 4778 4779 /* 4780 * Return TRUE if 'earlier' is an earlier snapshot in 'later's timeline. 4781 * For example, they could both be snapshots of the same filesystem, and 4782 * 'earlier' is before 'later'. Or 'earlier' could be the origin of 4783 * 'later's filesystem. Or 'earlier' could be an older snapshot in the origin's 4784 * filesystem. Or 'earlier' could be the origin's origin. 4785 * 4786 * If non-zero, earlier_txg is used instead of earlier's ds_creation_txg. 4787 */ 4788 boolean_t 4789 dsl_dataset_is_before(dsl_dataset_t *later, dsl_dataset_t *earlier, 4790 uint64_t earlier_txg) 4791 { 4792 dsl_pool_t *dp = later->ds_dir->dd_pool; 4793 int error; 4794 boolean_t ret; 4795 4796 ASSERT(dsl_pool_config_held(dp)); 4797 ASSERT(earlier->ds_is_snapshot || earlier_txg != 0); 4798 4799 if (earlier_txg == 0) 4800 earlier_txg = dsl_dataset_phys(earlier)->ds_creation_txg; 4801 4802 if (later->ds_is_snapshot && 4803 earlier_txg >= dsl_dataset_phys(later)->ds_creation_txg) 4804 return (B_FALSE); 4805 4806 if (later->ds_dir == earlier->ds_dir) 4807 return (B_TRUE); 4808 4809 /* 4810 * We check dd_origin_obj explicitly here rather than using 4811 * dsl_dir_is_clone() so that we will return TRUE if "earlier" 4812 * is $ORIGIN@$ORIGIN. dsl_dataset_space_written() depends on 4813 * this behavior. 4814 */ 4815 if (dsl_dir_phys(later->ds_dir)->dd_origin_obj == 0) 4816 return (B_FALSE); 4817 4818 dsl_dataset_t *origin; 4819 error = dsl_dataset_hold_obj(dp, 4820 dsl_dir_phys(later->ds_dir)->dd_origin_obj, FTAG, &origin); 4821 if (error != 0) 4822 return (B_FALSE); 4823 if (dsl_dataset_phys(origin)->ds_creation_txg == earlier_txg && 4824 origin->ds_dir == earlier->ds_dir) { 4825 dsl_dataset_rele(origin, FTAG); 4826 return (B_TRUE); 4827 } 4828 ret = dsl_dataset_is_before(origin, earlier, earlier_txg); 4829 dsl_dataset_rele(origin, FTAG); 4830 return (ret); 4831 } 4832 4833 void 4834 dsl_dataset_zapify(dsl_dataset_t *ds, dmu_tx_t *tx) 4835 { 4836 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 4837 dmu_object_zapify(mos, ds->ds_object, DMU_OT_DSL_DATASET, tx); 4838 } 4839 4840 boolean_t 4841 dsl_dataset_is_zapified(dsl_dataset_t *ds) 4842 { 4843 dmu_object_info_t doi; 4844 4845 dmu_object_info_from_db(ds->ds_dbuf, &doi); 4846 return (doi.doi_type == DMU_OTN_ZAP_METADATA); 4847 } 4848 4849 boolean_t 4850 dsl_dataset_has_resume_receive_state(dsl_dataset_t *ds) 4851 { 4852 return (dsl_dataset_is_zapified(ds) && 4853 zap_contains(ds->ds_dir->dd_pool->dp_meta_objset, 4854 ds->ds_object, DS_FIELD_RESUME_TOGUID) == 0); 4855 } 4856 4857 uint64_t 4858 dsl_dataset_get_remap_deadlist_object(dsl_dataset_t *ds) 4859 { 4860 uint64_t remap_deadlist_obj; 4861 int err; 4862 4863 if (!dsl_dataset_is_zapified(ds)) 4864 return (0); 4865 4866 err = zap_lookup(ds->ds_dir->dd_pool->dp_meta_objset, ds->ds_object, 4867 DS_FIELD_REMAP_DEADLIST, sizeof (remap_deadlist_obj), 1, 4868 &remap_deadlist_obj); 4869 4870 if (err != 0) { 4871 VERIFY3S(err, ==, ENOENT); 4872 return (0); 4873 } 4874 4875 ASSERT(remap_deadlist_obj != 0); 4876 return (remap_deadlist_obj); 4877 } 4878 4879 boolean_t 4880 dsl_dataset_remap_deadlist_exists(dsl_dataset_t *ds) 4881 { 4882 EQUIV(dsl_deadlist_is_open(&ds->ds_remap_deadlist), 4883 dsl_dataset_get_remap_deadlist_object(ds) != 0); 4884 return (dsl_deadlist_is_open(&ds->ds_remap_deadlist)); 4885 } 4886 4887 static void 4888 dsl_dataset_set_remap_deadlist_object(dsl_dataset_t *ds, uint64_t obj, 4889 dmu_tx_t *tx) 4890 { 4891 ASSERT(obj != 0); 4892 dsl_dataset_zapify(ds, tx); 4893 VERIFY0(zap_add(ds->ds_dir->dd_pool->dp_meta_objset, ds->ds_object, 4894 DS_FIELD_REMAP_DEADLIST, sizeof (obj), 1, &obj, tx)); 4895 } 4896 4897 static void 4898 dsl_dataset_unset_remap_deadlist_object(dsl_dataset_t *ds, dmu_tx_t *tx) 4899 { 4900 VERIFY0(zap_remove(ds->ds_dir->dd_pool->dp_meta_objset, 4901 ds->ds_object, DS_FIELD_REMAP_DEADLIST, tx)); 4902 } 4903 4904 void 4905 dsl_dataset_destroy_remap_deadlist(dsl_dataset_t *ds, dmu_tx_t *tx) 4906 { 4907 uint64_t remap_deadlist_object; 4908 spa_t *spa = ds->ds_dir->dd_pool->dp_spa; 4909 4910 ASSERT(dmu_tx_is_syncing(tx)); 4911 ASSERT(dsl_dataset_remap_deadlist_exists(ds)); 4912 4913 remap_deadlist_object = ds->ds_remap_deadlist.dl_object; 4914 dsl_deadlist_close(&ds->ds_remap_deadlist); 4915 dsl_deadlist_free(spa_meta_objset(spa), remap_deadlist_object, tx); 4916 dsl_dataset_unset_remap_deadlist_object(ds, tx); 4917 spa_feature_decr(spa, SPA_FEATURE_OBSOLETE_COUNTS, tx); 4918 } 4919 4920 void 4921 dsl_dataset_create_remap_deadlist(dsl_dataset_t *ds, dmu_tx_t *tx) 4922 { 4923 uint64_t remap_deadlist_obj; 4924 spa_t *spa = ds->ds_dir->dd_pool->dp_spa; 4925 4926 ASSERT(dmu_tx_is_syncing(tx)); 4927 ASSERT(MUTEX_HELD(&ds->ds_remap_deadlist_lock)); 4928 /* 4929 * Currently we only create remap deadlists when there are indirect 4930 * vdevs with referenced mappings. 4931 */ 4932 ASSERT(spa_feature_is_active(spa, SPA_FEATURE_DEVICE_REMOVAL)); 4933 4934 remap_deadlist_obj = dsl_deadlist_clone( 4935 &ds->ds_deadlist, UINT64_MAX, 4936 dsl_dataset_phys(ds)->ds_prev_snap_obj, tx); 4937 dsl_dataset_set_remap_deadlist_object(ds, 4938 remap_deadlist_obj, tx); 4939 dsl_deadlist_open(&ds->ds_remap_deadlist, spa_meta_objset(spa), 4940 remap_deadlist_obj); 4941 spa_feature_incr(spa, SPA_FEATURE_OBSOLETE_COUNTS, tx); 4942 } 4943 4944 void 4945 dsl_dataset_activate_redaction(dsl_dataset_t *ds, uint64_t *redact_snaps, 4946 uint64_t num_redact_snaps, dmu_tx_t *tx) 4947 { 4948 uint64_t dsobj = ds->ds_object; 4949 struct feature_type_uint64_array_arg *ftuaa = 4950 kmem_zalloc(sizeof (*ftuaa), KM_SLEEP); 4951 ftuaa->length = (int64_t)num_redact_snaps; 4952 if (num_redact_snaps > 0) { 4953 ftuaa->array = kmem_alloc(num_redact_snaps * sizeof (uint64_t), 4954 KM_SLEEP); 4955 memcpy(ftuaa->array, redact_snaps, num_redact_snaps * 4956 sizeof (uint64_t)); 4957 } 4958 dsl_dataset_activate_feature(dsobj, SPA_FEATURE_REDACTED_DATASETS, 4959 ftuaa, tx); 4960 ds->ds_feature[SPA_FEATURE_REDACTED_DATASETS] = ftuaa; 4961 } 4962 4963 /* 4964 * Find and return (in *oldest_dsobj) the oldest snapshot of the dsobj 4965 * dataset whose birth time is >= min_txg. 4966 */ 4967 int 4968 dsl_dataset_oldest_snapshot(spa_t *spa, uint64_t head_ds, uint64_t min_txg, 4969 uint64_t *oldest_dsobj) 4970 { 4971 dsl_dataset_t *ds; 4972 dsl_pool_t *dp = spa->spa_dsl_pool; 4973 4974 int error = dsl_dataset_hold_obj(dp, head_ds, FTAG, &ds); 4975 if (error != 0) 4976 return (error); 4977 4978 uint64_t prev_obj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 4979 uint64_t prev_obj_txg = dsl_dataset_phys(ds)->ds_prev_snap_txg; 4980 4981 while (prev_obj != 0 && min_txg < prev_obj_txg) { 4982 dsl_dataset_rele(ds, FTAG); 4983 if ((error = dsl_dataset_hold_obj(dp, prev_obj, 4984 FTAG, &ds)) != 0) 4985 return (error); 4986 prev_obj_txg = dsl_dataset_phys(ds)->ds_prev_snap_txg; 4987 prev_obj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 4988 } 4989 *oldest_dsobj = ds->ds_object; 4990 dsl_dataset_rele(ds, FTAG); 4991 return (0); 4992 } 4993 4994 ZFS_MODULE_PARAM(zfs, zfs_, max_recordsize, UINT, ZMOD_RW, 4995 "Max allowed record size"); 4996 4997 ZFS_MODULE_PARAM(zfs, zfs_, allow_redacted_dataset_mount, INT, ZMOD_RW, 4998 "Allow mounting of redacted datasets"); 4999 5000 ZFS_MODULE_PARAM(zfs, zfs_, snapshot_history_enabled, INT, ZMOD_RW, 5001 "Include snapshot events in pool history/events"); 5002 5003 EXPORT_SYMBOL(dsl_dataset_hold); 5004 EXPORT_SYMBOL(dsl_dataset_hold_flags); 5005 EXPORT_SYMBOL(dsl_dataset_hold_obj); 5006 EXPORT_SYMBOL(dsl_dataset_hold_obj_flags); 5007 EXPORT_SYMBOL(dsl_dataset_own); 5008 EXPORT_SYMBOL(dsl_dataset_own_obj); 5009 EXPORT_SYMBOL(dsl_dataset_name); 5010 EXPORT_SYMBOL(dsl_dataset_rele); 5011 EXPORT_SYMBOL(dsl_dataset_rele_flags); 5012 EXPORT_SYMBOL(dsl_dataset_disown); 5013 EXPORT_SYMBOL(dsl_dataset_tryown); 5014 EXPORT_SYMBOL(dsl_dataset_create_sync); 5015 EXPORT_SYMBOL(dsl_dataset_create_sync_dd); 5016 EXPORT_SYMBOL(dsl_dataset_snapshot_check); 5017 EXPORT_SYMBOL(dsl_dataset_snapshot_sync); 5018 EXPORT_SYMBOL(dsl_dataset_promote); 5019 EXPORT_SYMBOL(dsl_dataset_user_hold); 5020 EXPORT_SYMBOL(dsl_dataset_user_release); 5021 EXPORT_SYMBOL(dsl_dataset_get_holds); 5022 EXPORT_SYMBOL(dsl_dataset_get_blkptr); 5023 EXPORT_SYMBOL(dsl_dataset_get_spa); 5024 EXPORT_SYMBOL(dsl_dataset_modified_since_snap); 5025 EXPORT_SYMBOL(dsl_dataset_space_written); 5026 EXPORT_SYMBOL(dsl_dataset_space_wouldfree); 5027 EXPORT_SYMBOL(dsl_dataset_sync); 5028 EXPORT_SYMBOL(dsl_dataset_block_born); 5029 EXPORT_SYMBOL(dsl_dataset_block_kill); 5030 EXPORT_SYMBOL(dsl_dataset_dirty); 5031 EXPORT_SYMBOL(dsl_dataset_stats); 5032 EXPORT_SYMBOL(dsl_dataset_fast_stat); 5033 EXPORT_SYMBOL(dsl_dataset_space); 5034 EXPORT_SYMBOL(dsl_dataset_fsid_guid); 5035 EXPORT_SYMBOL(dsl_dsobj_to_dsname); 5036 EXPORT_SYMBOL(dsl_dataset_check_quota); 5037 EXPORT_SYMBOL(dsl_dataset_clone_swap_check_impl); 5038 EXPORT_SYMBOL(dsl_dataset_clone_swap_sync_impl); 5039