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 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 2126 /* 2127 * Check if the percentage of blocks shared between the clone and the 2128 * snapshot (as opposed to those that are clone only) is below a certain 2129 * threshold 2130 */ 2131 static boolean_t 2132 dsl_livelist_should_disable(dsl_dataset_t *ds) 2133 { 2134 uint64_t used, referenced; 2135 int percent_shared; 2136 2137 used = dsl_dir_get_usedds(ds->ds_dir); 2138 referenced = dsl_get_referenced(ds); 2139 if (referenced == 0) 2140 return (B_FALSE); 2141 percent_shared = (100 * (referenced - used)) / referenced; 2142 if (percent_shared <= zfs_livelist_min_percent_shared) 2143 return (B_TRUE); 2144 return (B_FALSE); 2145 } 2146 2147 /* 2148 * Check if it is possible to combine two livelist entries into one. 2149 * This is the case if the combined number of 'live' blkptrs (ALLOCs that 2150 * don't have a matching FREE) is under the maximum sublist size. 2151 * We check this by subtracting twice the total number of frees from the total 2152 * number of blkptrs. FREEs are counted twice because each FREE blkptr 2153 * will cancel out an ALLOC blkptr when the livelist is processed. 2154 */ 2155 static boolean_t 2156 dsl_livelist_should_condense(dsl_deadlist_entry_t *first, 2157 dsl_deadlist_entry_t *next) 2158 { 2159 uint64_t total_free = first->dle_bpobj.bpo_phys->bpo_num_freed + 2160 next->dle_bpobj.bpo_phys->bpo_num_freed; 2161 uint64_t total_entries = first->dle_bpobj.bpo_phys->bpo_num_blkptrs + 2162 next->dle_bpobj.bpo_phys->bpo_num_blkptrs; 2163 if ((total_entries - (2 * total_free)) < zfs_livelist_max_entries) 2164 return (B_TRUE); 2165 return (B_FALSE); 2166 } 2167 2168 typedef struct try_condense_arg { 2169 spa_t *spa; 2170 dsl_dataset_t *ds; 2171 } try_condense_arg_t; 2172 2173 /* 2174 * Iterate over the livelist entries, searching for a pair to condense. 2175 * A nonzero return value means stop, 0 means keep looking. 2176 */ 2177 static int 2178 dsl_livelist_try_condense(void *arg, dsl_deadlist_entry_t *first) 2179 { 2180 try_condense_arg_t *tca = arg; 2181 spa_t *spa = tca->spa; 2182 dsl_dataset_t *ds = tca->ds; 2183 dsl_deadlist_t *ll = &ds->ds_dir->dd_livelist; 2184 dsl_deadlist_entry_t *next; 2185 2186 /* The condense thread has not yet been created at import */ 2187 if (spa->spa_livelist_condense_zthr == NULL) 2188 return (1); 2189 2190 /* A condense is already in progress */ 2191 if (spa->spa_to_condense.ds != NULL) 2192 return (1); 2193 2194 next = AVL_NEXT(&ll->dl_tree, &first->dle_node); 2195 /* The livelist has only one entry - don't condense it */ 2196 if (next == NULL) 2197 return (1); 2198 2199 /* Next is the newest entry - don't condense it */ 2200 if (AVL_NEXT(&ll->dl_tree, &next->dle_node) == NULL) 2201 return (1); 2202 2203 /* This pair is not ready to condense but keep looking */ 2204 if (!dsl_livelist_should_condense(first, next)) 2205 return (0); 2206 2207 /* 2208 * Add a ref to prevent the dataset from being evicted while 2209 * the condense zthr or synctask are running. Ref will be 2210 * released at the end of the condense synctask 2211 */ 2212 dmu_buf_add_ref(ds->ds_dbuf, spa); 2213 2214 spa->spa_to_condense.ds = ds; 2215 spa->spa_to_condense.first = first; 2216 spa->spa_to_condense.next = next; 2217 spa->spa_to_condense.syncing = B_FALSE; 2218 spa->spa_to_condense.cancelled = B_FALSE; 2219 2220 zthr_wakeup(spa->spa_livelist_condense_zthr); 2221 return (1); 2222 } 2223 2224 static void 2225 dsl_flush_pending_livelist(dsl_dataset_t *ds, dmu_tx_t *tx) 2226 { 2227 dsl_dir_t *dd = ds->ds_dir; 2228 spa_t *spa = ds->ds_dir->dd_pool->dp_spa; 2229 dsl_deadlist_entry_t *last = dsl_deadlist_last(&dd->dd_livelist); 2230 2231 /* Check if we need to add a new sub-livelist */ 2232 if (last == NULL) { 2233 /* The livelist is empty */ 2234 dsl_deadlist_add_key(&dd->dd_livelist, 2235 tx->tx_txg - 1, tx); 2236 } else if (spa_sync_pass(spa) == 1) { 2237 /* 2238 * Check if the newest entry is full. If it is, make a new one. 2239 * We only do this once per sync because we could overfill a 2240 * sublist in one sync pass and don't want to add another entry 2241 * for a txg that is already represented. This ensures that 2242 * blkptrs born in the same txg are stored in the same sublist. 2243 */ 2244 bpobj_t bpobj = last->dle_bpobj; 2245 uint64_t all = bpobj.bpo_phys->bpo_num_blkptrs; 2246 uint64_t free = bpobj.bpo_phys->bpo_num_freed; 2247 uint64_t alloc = all - free; 2248 if (alloc > zfs_livelist_max_entries) { 2249 dsl_deadlist_add_key(&dd->dd_livelist, 2250 tx->tx_txg - 1, tx); 2251 } 2252 } 2253 2254 /* Insert each entry into the on-disk livelist */ 2255 bplist_iterate(&dd->dd_pending_allocs, 2256 dsl_deadlist_insert_alloc_cb, &dd->dd_livelist, tx); 2257 bplist_iterate(&dd->dd_pending_frees, 2258 dsl_deadlist_insert_free_cb, &dd->dd_livelist, tx); 2259 2260 /* Attempt to condense every pair of adjacent entries */ 2261 try_condense_arg_t arg = { 2262 .spa = spa, 2263 .ds = ds 2264 }; 2265 dsl_deadlist_iterate(&dd->dd_livelist, dsl_livelist_try_condense, 2266 &arg); 2267 } 2268 2269 void 2270 dsl_dataset_sync_done(dsl_dataset_t *ds, dmu_tx_t *tx) 2271 { 2272 objset_t *os = ds->ds_objset; 2273 2274 bplist_iterate(&ds->ds_pending_deadlist, 2275 dsl_deadlist_insert_alloc_cb, &ds->ds_deadlist, tx); 2276 2277 if (dsl_deadlist_is_open(&ds->ds_dir->dd_livelist)) { 2278 dsl_flush_pending_livelist(ds, tx); 2279 if (dsl_livelist_should_disable(ds)) { 2280 dsl_dir_remove_livelist(ds->ds_dir, tx, B_TRUE); 2281 } 2282 } 2283 2284 dsl_bookmark_sync_done(ds, tx); 2285 2286 multilist_destroy(&os->os_synced_dnodes); 2287 2288 if (os->os_encrypted) 2289 os->os_next_write_raw[tx->tx_txg & TXG_MASK] = B_FALSE; 2290 else 2291 ASSERT0(os->os_next_write_raw[tx->tx_txg & TXG_MASK]); 2292 2293 ASSERT(!dmu_objset_is_dirty(os, dmu_tx_get_txg(tx))); 2294 2295 dmu_buf_rele(ds->ds_dbuf, ds); 2296 2297 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 2298 if (zfeature_active(f, 2299 ds->ds_feature_activation[f])) { 2300 if (zfeature_active(f, ds->ds_feature[f])) 2301 continue; 2302 dsl_dataset_activate_feature(ds->ds_object, f, 2303 ds->ds_feature_activation[f], tx); 2304 ds->ds_feature[f] = ds->ds_feature_activation[f]; 2305 } 2306 } 2307 } 2308 2309 int 2310 get_clones_stat_impl(dsl_dataset_t *ds, nvlist_t *val) 2311 { 2312 uint64_t count = 0; 2313 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 2314 zap_cursor_t zc; 2315 zap_attribute_t za; 2316 2317 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool)); 2318 2319 /* 2320 * There may be missing entries in ds_next_clones_obj 2321 * due to a bug in a previous version of the code. 2322 * Only trust it if it has the right number of entries. 2323 */ 2324 if (dsl_dataset_phys(ds)->ds_next_clones_obj != 0) { 2325 VERIFY0(zap_count(mos, dsl_dataset_phys(ds)->ds_next_clones_obj, 2326 &count)); 2327 } 2328 if (count != dsl_dataset_phys(ds)->ds_num_children - 1) { 2329 return (SET_ERROR(ENOENT)); 2330 } 2331 for (zap_cursor_init(&zc, mos, 2332 dsl_dataset_phys(ds)->ds_next_clones_obj); 2333 zap_cursor_retrieve(&zc, &za) == 0; 2334 zap_cursor_advance(&zc)) { 2335 dsl_dataset_t *clone; 2336 char buf[ZFS_MAX_DATASET_NAME_LEN]; 2337 VERIFY0(dsl_dataset_hold_obj(ds->ds_dir->dd_pool, 2338 za.za_first_integer, FTAG, &clone)); 2339 dsl_dir_name(clone->ds_dir, buf); 2340 fnvlist_add_boolean(val, buf); 2341 dsl_dataset_rele(clone, FTAG); 2342 } 2343 zap_cursor_fini(&zc); 2344 return (0); 2345 } 2346 2347 void 2348 get_clones_stat(dsl_dataset_t *ds, nvlist_t *nv) 2349 { 2350 nvlist_t *propval = fnvlist_alloc(); 2351 nvlist_t *val = fnvlist_alloc(); 2352 2353 if (get_clones_stat_impl(ds, val) == 0) { 2354 fnvlist_add_nvlist(propval, ZPROP_VALUE, val); 2355 fnvlist_add_nvlist(nv, zfs_prop_to_name(ZFS_PROP_CLONES), 2356 propval); 2357 } 2358 2359 nvlist_free(val); 2360 nvlist_free(propval); 2361 } 2362 2363 static char * 2364 get_receive_resume_token_impl(dsl_dataset_t *ds) 2365 { 2366 if (!dsl_dataset_has_resume_receive_state(ds)) 2367 return (NULL); 2368 2369 dsl_pool_t *dp = ds->ds_dir->dd_pool; 2370 char *str; 2371 void *packed; 2372 uint8_t *compressed; 2373 uint64_t val; 2374 nvlist_t *token_nv = fnvlist_alloc(); 2375 size_t packed_size, compressed_size; 2376 2377 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 2378 DS_FIELD_RESUME_FROMGUID, sizeof (val), 1, &val) == 0) { 2379 fnvlist_add_uint64(token_nv, "fromguid", val); 2380 } 2381 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 2382 DS_FIELD_RESUME_OBJECT, sizeof (val), 1, &val) == 0) { 2383 fnvlist_add_uint64(token_nv, "object", val); 2384 } 2385 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 2386 DS_FIELD_RESUME_OFFSET, sizeof (val), 1, &val) == 0) { 2387 fnvlist_add_uint64(token_nv, "offset", val); 2388 } 2389 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 2390 DS_FIELD_RESUME_BYTES, sizeof (val), 1, &val) == 0) { 2391 fnvlist_add_uint64(token_nv, "bytes", val); 2392 } 2393 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 2394 DS_FIELD_RESUME_TOGUID, sizeof (val), 1, &val) == 0) { 2395 fnvlist_add_uint64(token_nv, "toguid", val); 2396 } 2397 char buf[MAXNAMELEN]; 2398 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 2399 DS_FIELD_RESUME_TONAME, 1, sizeof (buf), buf) == 0) { 2400 fnvlist_add_string(token_nv, "toname", buf); 2401 } 2402 if (zap_contains(dp->dp_meta_objset, ds->ds_object, 2403 DS_FIELD_RESUME_LARGEBLOCK) == 0) { 2404 fnvlist_add_boolean(token_nv, "largeblockok"); 2405 } 2406 if (zap_contains(dp->dp_meta_objset, ds->ds_object, 2407 DS_FIELD_RESUME_EMBEDOK) == 0) { 2408 fnvlist_add_boolean(token_nv, "embedok"); 2409 } 2410 if (zap_contains(dp->dp_meta_objset, ds->ds_object, 2411 DS_FIELD_RESUME_COMPRESSOK) == 0) { 2412 fnvlist_add_boolean(token_nv, "compressok"); 2413 } 2414 if (zap_contains(dp->dp_meta_objset, ds->ds_object, 2415 DS_FIELD_RESUME_RAWOK) == 0) { 2416 fnvlist_add_boolean(token_nv, "rawok"); 2417 } 2418 if (dsl_dataset_feature_is_active(ds, 2419 SPA_FEATURE_REDACTED_DATASETS)) { 2420 uint64_t num_redact_snaps = 0; 2421 uint64_t *redact_snaps = NULL; 2422 VERIFY3B(dsl_dataset_get_uint64_array_feature(ds, 2423 SPA_FEATURE_REDACTED_DATASETS, &num_redact_snaps, 2424 &redact_snaps), ==, B_TRUE); 2425 fnvlist_add_uint64_array(token_nv, "redact_snaps", 2426 redact_snaps, num_redact_snaps); 2427 } 2428 if (zap_contains(dp->dp_meta_objset, ds->ds_object, 2429 DS_FIELD_RESUME_REDACT_BOOKMARK_SNAPS) == 0) { 2430 uint64_t num_redact_snaps = 0, int_size = 0; 2431 uint64_t *redact_snaps = NULL; 2432 VERIFY0(zap_length(dp->dp_meta_objset, ds->ds_object, 2433 DS_FIELD_RESUME_REDACT_BOOKMARK_SNAPS, &int_size, 2434 &num_redact_snaps)); 2435 ASSERT3U(int_size, ==, sizeof (uint64_t)); 2436 2437 redact_snaps = kmem_alloc(int_size * num_redact_snaps, 2438 KM_SLEEP); 2439 VERIFY0(zap_lookup(dp->dp_meta_objset, ds->ds_object, 2440 DS_FIELD_RESUME_REDACT_BOOKMARK_SNAPS, int_size, 2441 num_redact_snaps, redact_snaps)); 2442 fnvlist_add_uint64_array(token_nv, "book_redact_snaps", 2443 redact_snaps, num_redact_snaps); 2444 kmem_free(redact_snaps, int_size * num_redact_snaps); 2445 } 2446 packed = fnvlist_pack(token_nv, &packed_size); 2447 fnvlist_free(token_nv); 2448 compressed = kmem_alloc(packed_size, KM_SLEEP); 2449 2450 compressed_size = gzip_compress(packed, compressed, 2451 packed_size, packed_size, 6); 2452 2453 zio_cksum_t cksum; 2454 fletcher_4_native_varsize(compressed, compressed_size, &cksum); 2455 2456 size_t alloc_size = compressed_size * 2 + 1; 2457 str = kmem_alloc(alloc_size, KM_SLEEP); 2458 for (int i = 0; i < compressed_size; i++) { 2459 size_t offset = i * 2; 2460 (void) snprintf(str + offset, alloc_size - offset, 2461 "%02x", compressed[i]); 2462 } 2463 str[compressed_size * 2] = '\0'; 2464 char *propval = kmem_asprintf("%u-%llx-%llx-%s", 2465 ZFS_SEND_RESUME_TOKEN_VERSION, 2466 (longlong_t)cksum.zc_word[0], 2467 (longlong_t)packed_size, str); 2468 kmem_free(packed, packed_size); 2469 kmem_free(str, alloc_size); 2470 kmem_free(compressed, packed_size); 2471 return (propval); 2472 } 2473 2474 /* 2475 * Returns a string that represents the receive resume state token. It should 2476 * be freed with strfree(). NULL is returned if no resume state is present. 2477 */ 2478 char * 2479 get_receive_resume_token(dsl_dataset_t *ds) 2480 { 2481 /* 2482 * A failed "newfs" (e.g. full) resumable receive leaves 2483 * the stats set on this dataset. Check here for the prop. 2484 */ 2485 char *token = get_receive_resume_token_impl(ds); 2486 if (token != NULL) 2487 return (token); 2488 /* 2489 * A failed incremental resumable receive leaves the 2490 * stats set on our child named "%recv". Check the child 2491 * for the prop. 2492 */ 2493 /* 6 extra bytes for /%recv */ 2494 char name[ZFS_MAX_DATASET_NAME_LEN + 6]; 2495 dsl_dataset_t *recv_ds; 2496 dsl_dataset_name(ds, name); 2497 if (strlcat(name, "/", sizeof (name)) < sizeof (name) && 2498 strlcat(name, recv_clone_name, sizeof (name)) < sizeof (name) && 2499 dsl_dataset_hold(ds->ds_dir->dd_pool, name, FTAG, &recv_ds) == 0) { 2500 token = get_receive_resume_token_impl(recv_ds); 2501 dsl_dataset_rele(recv_ds, FTAG); 2502 } 2503 return (token); 2504 } 2505 2506 uint64_t 2507 dsl_get_refratio(dsl_dataset_t *ds) 2508 { 2509 uint64_t ratio = dsl_dataset_phys(ds)->ds_compressed_bytes == 0 ? 100 : 2510 (dsl_dataset_phys(ds)->ds_uncompressed_bytes * 100 / 2511 dsl_dataset_phys(ds)->ds_compressed_bytes); 2512 return (ratio); 2513 } 2514 2515 uint64_t 2516 dsl_get_logicalreferenced(dsl_dataset_t *ds) 2517 { 2518 return (dsl_dataset_phys(ds)->ds_uncompressed_bytes); 2519 } 2520 2521 uint64_t 2522 dsl_get_compressratio(dsl_dataset_t *ds) 2523 { 2524 if (ds->ds_is_snapshot) { 2525 return (dsl_get_refratio(ds)); 2526 } else { 2527 dsl_dir_t *dd = ds->ds_dir; 2528 mutex_enter(&dd->dd_lock); 2529 uint64_t val = dsl_dir_get_compressratio(dd); 2530 mutex_exit(&dd->dd_lock); 2531 return (val); 2532 } 2533 } 2534 2535 uint64_t 2536 dsl_get_used(dsl_dataset_t *ds) 2537 { 2538 if (ds->ds_is_snapshot) { 2539 return (dsl_dataset_phys(ds)->ds_unique_bytes); 2540 } else { 2541 dsl_dir_t *dd = ds->ds_dir; 2542 mutex_enter(&dd->dd_lock); 2543 uint64_t val = dsl_dir_get_used(dd); 2544 mutex_exit(&dd->dd_lock); 2545 return (val); 2546 } 2547 } 2548 2549 uint64_t 2550 dsl_get_creation(dsl_dataset_t *ds) 2551 { 2552 return (dsl_dataset_phys(ds)->ds_creation_time); 2553 } 2554 2555 uint64_t 2556 dsl_get_creationtxg(dsl_dataset_t *ds) 2557 { 2558 return (dsl_dataset_phys(ds)->ds_creation_txg); 2559 } 2560 2561 uint64_t 2562 dsl_get_refquota(dsl_dataset_t *ds) 2563 { 2564 return (ds->ds_quota); 2565 } 2566 2567 uint64_t 2568 dsl_get_refreservation(dsl_dataset_t *ds) 2569 { 2570 return (ds->ds_reserved); 2571 } 2572 2573 uint64_t 2574 dsl_get_guid(dsl_dataset_t *ds) 2575 { 2576 return (dsl_dataset_phys(ds)->ds_guid); 2577 } 2578 2579 uint64_t 2580 dsl_get_unique(dsl_dataset_t *ds) 2581 { 2582 return (dsl_dataset_phys(ds)->ds_unique_bytes); 2583 } 2584 2585 uint64_t 2586 dsl_get_objsetid(dsl_dataset_t *ds) 2587 { 2588 return (ds->ds_object); 2589 } 2590 2591 uint64_t 2592 dsl_get_userrefs(dsl_dataset_t *ds) 2593 { 2594 return (ds->ds_userrefs); 2595 } 2596 2597 uint64_t 2598 dsl_get_defer_destroy(dsl_dataset_t *ds) 2599 { 2600 return (DS_IS_DEFER_DESTROY(ds) ? 1 : 0); 2601 } 2602 2603 uint64_t 2604 dsl_get_referenced(dsl_dataset_t *ds) 2605 { 2606 return (dsl_dataset_phys(ds)->ds_referenced_bytes); 2607 } 2608 2609 uint64_t 2610 dsl_get_numclones(dsl_dataset_t *ds) 2611 { 2612 ASSERT(ds->ds_is_snapshot); 2613 return (dsl_dataset_phys(ds)->ds_num_children - 1); 2614 } 2615 2616 uint64_t 2617 dsl_get_inconsistent(dsl_dataset_t *ds) 2618 { 2619 return ((dsl_dataset_phys(ds)->ds_flags & DS_FLAG_INCONSISTENT) ? 2620 1 : 0); 2621 } 2622 2623 uint64_t 2624 dsl_get_redacted(dsl_dataset_t *ds) 2625 { 2626 return (dsl_dataset_feature_is_active(ds, 2627 SPA_FEATURE_REDACTED_DATASETS)); 2628 } 2629 2630 uint64_t 2631 dsl_get_available(dsl_dataset_t *ds) 2632 { 2633 uint64_t refdbytes = dsl_get_referenced(ds); 2634 uint64_t availbytes = dsl_dir_space_available(ds->ds_dir, 2635 NULL, 0, TRUE); 2636 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes) { 2637 availbytes += 2638 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes; 2639 } 2640 if (ds->ds_quota != 0) { 2641 /* 2642 * Adjust available bytes according to refquota 2643 */ 2644 if (refdbytes < ds->ds_quota) { 2645 availbytes = MIN(availbytes, 2646 ds->ds_quota - refdbytes); 2647 } else { 2648 availbytes = 0; 2649 } 2650 } 2651 return (availbytes); 2652 } 2653 2654 int 2655 dsl_get_written(dsl_dataset_t *ds, uint64_t *written) 2656 { 2657 dsl_pool_t *dp = ds->ds_dir->dd_pool; 2658 dsl_dataset_t *prev; 2659 int err = dsl_dataset_hold_obj(dp, 2660 dsl_dataset_phys(ds)->ds_prev_snap_obj, FTAG, &prev); 2661 if (err == 0) { 2662 uint64_t comp, uncomp; 2663 err = dsl_dataset_space_written(prev, ds, written, 2664 &comp, &uncomp); 2665 dsl_dataset_rele(prev, FTAG); 2666 } 2667 return (err); 2668 } 2669 2670 /* 2671 * 'snap' should be a buffer of size ZFS_MAX_DATASET_NAME_LEN. 2672 */ 2673 int 2674 dsl_get_prev_snap(dsl_dataset_t *ds, char *snap) 2675 { 2676 dsl_pool_t *dp = ds->ds_dir->dd_pool; 2677 if (ds->ds_prev != NULL && ds->ds_prev != dp->dp_origin_snap) { 2678 dsl_dataset_name(ds->ds_prev, snap); 2679 return (0); 2680 } else { 2681 return (SET_ERROR(ENOENT)); 2682 } 2683 } 2684 2685 void 2686 dsl_get_redact_snaps(dsl_dataset_t *ds, nvlist_t *propval) 2687 { 2688 uint64_t nsnaps; 2689 uint64_t *snaps; 2690 if (dsl_dataset_get_uint64_array_feature(ds, 2691 SPA_FEATURE_REDACTED_DATASETS, &nsnaps, &snaps)) { 2692 fnvlist_add_uint64_array(propval, ZPROP_VALUE, snaps, 2693 nsnaps); 2694 } 2695 } 2696 2697 /* 2698 * Returns the mountpoint property and source for the given dataset in the value 2699 * and source buffers. The value buffer must be at least as large as MAXPATHLEN 2700 * and the source buffer as least as large a ZFS_MAX_DATASET_NAME_LEN. 2701 * Returns 0 on success and an error on failure. 2702 */ 2703 int 2704 dsl_get_mountpoint(dsl_dataset_t *ds, const char *dsname, char *value, 2705 char *source) 2706 { 2707 int error; 2708 dsl_pool_t *dp = ds->ds_dir->dd_pool; 2709 2710 /* Retrieve the mountpoint value stored in the zap object */ 2711 error = dsl_prop_get_ds(ds, zfs_prop_to_name(ZFS_PROP_MOUNTPOINT), 1, 2712 ZAP_MAXVALUELEN, value, source); 2713 if (error != 0) { 2714 return (error); 2715 } 2716 2717 /* 2718 * Process the dsname and source to find the full mountpoint string. 2719 * Can be skipped for 'legacy' or 'none'. 2720 */ 2721 if (value[0] == '/') { 2722 char *buf = kmem_alloc(ZAP_MAXVALUELEN, KM_SLEEP); 2723 char *root = buf; 2724 const char *relpath; 2725 2726 /* 2727 * If we inherit the mountpoint, even from a dataset 2728 * with a received value, the source will be the path of 2729 * the dataset we inherit from. If source is 2730 * ZPROP_SOURCE_VAL_RECVD, the received value is not 2731 * inherited. 2732 */ 2733 if (strcmp(source, ZPROP_SOURCE_VAL_RECVD) == 0) { 2734 relpath = ""; 2735 } else { 2736 ASSERT0(strncmp(dsname, source, strlen(source))); 2737 relpath = dsname + strlen(source); 2738 if (relpath[0] == '/') 2739 relpath++; 2740 } 2741 2742 spa_altroot(dp->dp_spa, root, ZAP_MAXVALUELEN); 2743 2744 /* 2745 * Special case an alternate root of '/'. This will 2746 * avoid having multiple leading slashes in the 2747 * mountpoint path. 2748 */ 2749 if (strcmp(root, "/") == 0) 2750 root++; 2751 2752 /* 2753 * If the mountpoint is '/' then skip over this 2754 * if we are obtaining either an alternate root or 2755 * an inherited mountpoint. 2756 */ 2757 char *mnt = value; 2758 if (value[1] == '\0' && (root[0] != '\0' || 2759 relpath[0] != '\0')) 2760 mnt = value + 1; 2761 2762 mnt = kmem_strdup(mnt); 2763 2764 if (relpath[0] == '\0') { 2765 (void) snprintf(value, ZAP_MAXVALUELEN, "%s%s", 2766 root, mnt); 2767 } else { 2768 (void) snprintf(value, ZAP_MAXVALUELEN, "%s%s%s%s", 2769 root, mnt, relpath[0] == '@' ? "" : "/", 2770 relpath); 2771 } 2772 kmem_free(buf, ZAP_MAXVALUELEN); 2773 kmem_strfree(mnt); 2774 } 2775 2776 return (0); 2777 } 2778 2779 void 2780 dsl_dataset_stats(dsl_dataset_t *ds, nvlist_t *nv) 2781 { 2782 dsl_pool_t *dp __maybe_unused = ds->ds_dir->dd_pool; 2783 2784 ASSERT(dsl_pool_config_held(dp)); 2785 2786 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRATIO, 2787 dsl_get_refratio(ds)); 2788 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_LOGICALREFERENCED, 2789 dsl_get_logicalreferenced(ds)); 2790 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_COMPRESSRATIO, 2791 dsl_get_compressratio(ds)); 2792 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USED, 2793 dsl_get_used(ds)); 2794 2795 if (ds->ds_is_snapshot) { 2796 get_clones_stat(ds, nv); 2797 } else { 2798 char buf[ZFS_MAX_DATASET_NAME_LEN]; 2799 if (dsl_get_prev_snap(ds, buf) == 0) 2800 dsl_prop_nvlist_add_string(nv, ZFS_PROP_PREV_SNAP, 2801 buf); 2802 dsl_dir_stats(ds->ds_dir, nv); 2803 } 2804 2805 nvlist_t *propval = fnvlist_alloc(); 2806 dsl_get_redact_snaps(ds, propval); 2807 fnvlist_add_nvlist(nv, zfs_prop_to_name(ZFS_PROP_REDACT_SNAPS), 2808 propval); 2809 nvlist_free(propval); 2810 2811 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_AVAILABLE, 2812 dsl_get_available(ds)); 2813 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFERENCED, 2814 dsl_get_referenced(ds)); 2815 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATION, 2816 dsl_get_creation(ds)); 2817 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATETXG, 2818 dsl_get_creationtxg(ds)); 2819 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFQUOTA, 2820 dsl_get_refquota(ds)); 2821 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRESERVATION, 2822 dsl_get_refreservation(ds)); 2823 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_GUID, 2824 dsl_get_guid(ds)); 2825 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_UNIQUE, 2826 dsl_get_unique(ds)); 2827 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_OBJSETID, 2828 dsl_get_objsetid(ds)); 2829 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USERREFS, 2830 dsl_get_userrefs(ds)); 2831 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_DEFER_DESTROY, 2832 dsl_get_defer_destroy(ds)); 2833 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_SNAPSHOTS_CHANGED, 2834 dsl_dir_snap_cmtime(ds->ds_dir).tv_sec); 2835 dsl_dataset_crypt_stats(ds, nv); 2836 2837 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) { 2838 uint64_t written; 2839 if (dsl_get_written(ds, &written) == 0) { 2840 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_WRITTEN, 2841 written); 2842 } 2843 } 2844 2845 if (!dsl_dataset_is_snapshot(ds)) { 2846 char *token = get_receive_resume_token(ds); 2847 if (token != NULL) { 2848 dsl_prop_nvlist_add_string(nv, 2849 ZFS_PROP_RECEIVE_RESUME_TOKEN, token); 2850 kmem_strfree(token); 2851 } 2852 } 2853 } 2854 2855 void 2856 dsl_dataset_fast_stat(dsl_dataset_t *ds, dmu_objset_stats_t *stat) 2857 { 2858 dsl_pool_t *dp __maybe_unused = ds->ds_dir->dd_pool; 2859 ASSERT(dsl_pool_config_held(dp)); 2860 2861 stat->dds_creation_txg = dsl_get_creationtxg(ds); 2862 stat->dds_inconsistent = dsl_get_inconsistent(ds); 2863 stat->dds_guid = dsl_get_guid(ds); 2864 stat->dds_redacted = dsl_get_redacted(ds); 2865 stat->dds_origin[0] = '\0'; 2866 if (ds->ds_is_snapshot) { 2867 stat->dds_is_snapshot = B_TRUE; 2868 stat->dds_num_clones = dsl_get_numclones(ds); 2869 } else { 2870 stat->dds_is_snapshot = B_FALSE; 2871 stat->dds_num_clones = 0; 2872 2873 if (dsl_dir_is_clone(ds->ds_dir)) { 2874 dsl_dir_get_origin(ds->ds_dir, stat->dds_origin); 2875 } 2876 } 2877 } 2878 2879 uint64_t 2880 dsl_dataset_fsid_guid(dsl_dataset_t *ds) 2881 { 2882 return (ds->ds_fsid_guid); 2883 } 2884 2885 void 2886 dsl_dataset_space(dsl_dataset_t *ds, 2887 uint64_t *refdbytesp, uint64_t *availbytesp, 2888 uint64_t *usedobjsp, uint64_t *availobjsp) 2889 { 2890 *refdbytesp = dsl_dataset_phys(ds)->ds_referenced_bytes; 2891 *availbytesp = dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE); 2892 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes) 2893 *availbytesp += 2894 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes; 2895 if (ds->ds_quota != 0) { 2896 /* 2897 * Adjust available bytes according to refquota 2898 */ 2899 if (*refdbytesp < ds->ds_quota) 2900 *availbytesp = MIN(*availbytesp, 2901 ds->ds_quota - *refdbytesp); 2902 else 2903 *availbytesp = 0; 2904 } 2905 rrw_enter(&ds->ds_bp_rwlock, RW_READER, FTAG); 2906 *usedobjsp = BP_GET_FILL(&dsl_dataset_phys(ds)->ds_bp); 2907 rrw_exit(&ds->ds_bp_rwlock, FTAG); 2908 *availobjsp = DN_MAX_OBJECT - *usedobjsp; 2909 } 2910 2911 boolean_t 2912 dsl_dataset_modified_since_snap(dsl_dataset_t *ds, dsl_dataset_t *snap) 2913 { 2914 dsl_pool_t *dp __maybe_unused = ds->ds_dir->dd_pool; 2915 uint64_t birth; 2916 2917 ASSERT(dsl_pool_config_held(dp)); 2918 if (snap == NULL) 2919 return (B_FALSE); 2920 rrw_enter(&ds->ds_bp_rwlock, RW_READER, FTAG); 2921 birth = dsl_dataset_get_blkptr(ds)->blk_birth; 2922 rrw_exit(&ds->ds_bp_rwlock, FTAG); 2923 if (birth > dsl_dataset_phys(snap)->ds_creation_txg) { 2924 objset_t *os, *os_snap; 2925 /* 2926 * It may be that only the ZIL differs, because it was 2927 * reset in the head. Don't count that as being 2928 * modified. 2929 */ 2930 if (dmu_objset_from_ds(ds, &os) != 0) 2931 return (B_TRUE); 2932 if (dmu_objset_from_ds(snap, &os_snap) != 0) 2933 return (B_TRUE); 2934 return (memcmp(&os->os_phys->os_meta_dnode, 2935 &os_snap->os_phys->os_meta_dnode, 2936 sizeof (os->os_phys->os_meta_dnode)) != 0); 2937 } 2938 return (B_FALSE); 2939 } 2940 2941 static int 2942 dsl_dataset_rename_snapshot_check_impl(dsl_pool_t *dp, 2943 dsl_dataset_t *hds, void *arg) 2944 { 2945 (void) dp; 2946 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 2947 int error; 2948 uint64_t val; 2949 2950 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val); 2951 if (error != 0) { 2952 /* ignore nonexistent snapshots */ 2953 return (error == ENOENT ? 0 : error); 2954 } 2955 2956 /* new name should not exist */ 2957 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_newsnapname, &val); 2958 if (error == 0) 2959 error = SET_ERROR(EEXIST); 2960 else if (error == ENOENT) 2961 error = 0; 2962 2963 /* dataset name + 1 for the "@" + the new snapshot name must fit */ 2964 if (dsl_dir_namelen(hds->ds_dir) + 1 + 2965 strlen(ddrsa->ddrsa_newsnapname) >= ZFS_MAX_DATASET_NAME_LEN) 2966 error = SET_ERROR(ENAMETOOLONG); 2967 2968 return (error); 2969 } 2970 2971 int 2972 dsl_dataset_rename_snapshot_check(void *arg, dmu_tx_t *tx) 2973 { 2974 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 2975 dsl_pool_t *dp = dmu_tx_pool(tx); 2976 dsl_dataset_t *hds; 2977 int error; 2978 2979 error = dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds); 2980 if (error != 0) 2981 return (error); 2982 2983 if (ddrsa->ddrsa_recursive) { 2984 error = dmu_objset_find_dp(dp, hds->ds_dir->dd_object, 2985 dsl_dataset_rename_snapshot_check_impl, ddrsa, 2986 DS_FIND_CHILDREN); 2987 } else { 2988 error = dsl_dataset_rename_snapshot_check_impl(dp, hds, ddrsa); 2989 } 2990 dsl_dataset_rele(hds, FTAG); 2991 return (error); 2992 } 2993 2994 static int 2995 dsl_dataset_rename_snapshot_sync_impl(dsl_pool_t *dp, 2996 dsl_dataset_t *hds, void *arg) 2997 { 2998 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 2999 dsl_dataset_t *ds; 3000 uint64_t val; 3001 dmu_tx_t *tx = ddrsa->ddrsa_tx; 3002 int error; 3003 3004 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val); 3005 ASSERT(error == 0 || error == ENOENT); 3006 if (error == ENOENT) { 3007 /* ignore nonexistent snapshots */ 3008 return (0); 3009 } 3010 3011 VERIFY0(dsl_dataset_hold_obj(dp, val, FTAG, &ds)); 3012 3013 /* log before we change the name */ 3014 spa_history_log_internal_ds(ds, "rename", tx, 3015 "-> @%s", ddrsa->ddrsa_newsnapname); 3016 3017 VERIFY0(dsl_dataset_snap_remove(hds, ddrsa->ddrsa_oldsnapname, tx, 3018 B_FALSE)); 3019 mutex_enter(&ds->ds_lock); 3020 (void) strlcpy(ds->ds_snapname, ddrsa->ddrsa_newsnapname, 3021 sizeof (ds->ds_snapname)); 3022 mutex_exit(&ds->ds_lock); 3023 VERIFY0(zap_add(dp->dp_meta_objset, 3024 dsl_dataset_phys(hds)->ds_snapnames_zapobj, 3025 ds->ds_snapname, 8, 1, &ds->ds_object, tx)); 3026 zvol_rename_minors(dp->dp_spa, ddrsa->ddrsa_oldsnapname, 3027 ddrsa->ddrsa_newsnapname, B_TRUE); 3028 3029 dsl_dataset_rele(ds, FTAG); 3030 return (0); 3031 } 3032 3033 void 3034 dsl_dataset_rename_snapshot_sync(void *arg, dmu_tx_t *tx) 3035 { 3036 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 3037 dsl_pool_t *dp = dmu_tx_pool(tx); 3038 dsl_dataset_t *hds = NULL; 3039 3040 VERIFY0(dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds)); 3041 ddrsa->ddrsa_tx = tx; 3042 if (ddrsa->ddrsa_recursive) { 3043 VERIFY0(dmu_objset_find_dp(dp, hds->ds_dir->dd_object, 3044 dsl_dataset_rename_snapshot_sync_impl, ddrsa, 3045 DS_FIND_CHILDREN)); 3046 } else { 3047 VERIFY0(dsl_dataset_rename_snapshot_sync_impl(dp, hds, ddrsa)); 3048 } 3049 dsl_dataset_rele(hds, FTAG); 3050 } 3051 3052 int 3053 dsl_dataset_rename_snapshot(const char *fsname, 3054 const char *oldsnapname, const char *newsnapname, boolean_t recursive) 3055 { 3056 dsl_dataset_rename_snapshot_arg_t ddrsa; 3057 3058 ddrsa.ddrsa_fsname = fsname; 3059 ddrsa.ddrsa_oldsnapname = oldsnapname; 3060 ddrsa.ddrsa_newsnapname = newsnapname; 3061 ddrsa.ddrsa_recursive = recursive; 3062 3063 return (dsl_sync_task(fsname, dsl_dataset_rename_snapshot_check, 3064 dsl_dataset_rename_snapshot_sync, &ddrsa, 3065 1, ZFS_SPACE_CHECK_RESERVED)); 3066 } 3067 3068 /* 3069 * If we're doing an ownership handoff, we need to make sure that there is 3070 * only one long hold on the dataset. We're not allowed to change anything here 3071 * so we don't permanently release the long hold or regular hold here. We want 3072 * to do this only when syncing to avoid the dataset unexpectedly going away 3073 * when we release the long hold. 3074 */ 3075 static int 3076 dsl_dataset_handoff_check(dsl_dataset_t *ds, void *owner, dmu_tx_t *tx) 3077 { 3078 boolean_t held = B_FALSE; 3079 3080 if (!dmu_tx_is_syncing(tx)) 3081 return (0); 3082 3083 dsl_dir_t *dd = ds->ds_dir; 3084 mutex_enter(&dd->dd_activity_lock); 3085 uint64_t holds = zfs_refcount_count(&ds->ds_longholds) - 3086 (owner != NULL ? 1 : 0); 3087 /* 3088 * The value of dd_activity_waiters can chance as soon as we drop the 3089 * lock, but we're fine with that; new waiters coming in or old 3090 * waiters leaving doesn't cause problems, since we're going to cancel 3091 * waiters later anyway. The goal of this check is to verify that no 3092 * non-waiters have long-holds, and all new long-holds will be 3093 * prevented because we're holding the pool config as writer. 3094 */ 3095 if (holds != dd->dd_activity_waiters) 3096 held = B_TRUE; 3097 mutex_exit(&dd->dd_activity_lock); 3098 3099 if (held) 3100 return (SET_ERROR(EBUSY)); 3101 3102 return (0); 3103 } 3104 3105 int 3106 dsl_dataset_rollback_check(void *arg, dmu_tx_t *tx) 3107 { 3108 dsl_dataset_rollback_arg_t *ddra = arg; 3109 dsl_pool_t *dp = dmu_tx_pool(tx); 3110 dsl_dataset_t *ds; 3111 int64_t unused_refres_delta; 3112 int error; 3113 3114 error = dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds); 3115 if (error != 0) 3116 return (error); 3117 3118 /* must not be a snapshot */ 3119 if (ds->ds_is_snapshot) { 3120 dsl_dataset_rele(ds, FTAG); 3121 return (SET_ERROR(EINVAL)); 3122 } 3123 3124 /* must have a most recent snapshot */ 3125 if (dsl_dataset_phys(ds)->ds_prev_snap_txg < TXG_INITIAL) { 3126 dsl_dataset_rele(ds, FTAG); 3127 return (SET_ERROR(ESRCH)); 3128 } 3129 3130 /* 3131 * No rollback to a snapshot created in the current txg, because 3132 * the rollback may dirty the dataset and create blocks that are 3133 * not reachable from the rootbp while having a birth txg that 3134 * falls into the snapshot's range. 3135 */ 3136 if (dmu_tx_is_syncing(tx) && 3137 dsl_dataset_phys(ds)->ds_prev_snap_txg >= tx->tx_txg) { 3138 dsl_dataset_rele(ds, FTAG); 3139 return (SET_ERROR(EAGAIN)); 3140 } 3141 3142 /* 3143 * If the expected target snapshot is specified, then check that 3144 * the latest snapshot is it. 3145 */ 3146 if (ddra->ddra_tosnap != NULL) { 3147 dsl_dataset_t *snapds; 3148 3149 /* Check if the target snapshot exists at all. */ 3150 error = dsl_dataset_hold(dp, ddra->ddra_tosnap, FTAG, &snapds); 3151 if (error != 0) { 3152 /* 3153 * ESRCH is used to signal that the target snapshot does 3154 * not exist, while ENOENT is used to report that 3155 * the rolled back dataset does not exist. 3156 * ESRCH is also used to cover other cases where the 3157 * target snapshot is not related to the dataset being 3158 * rolled back such as being in a different pool. 3159 */ 3160 if (error == ENOENT || error == EXDEV) 3161 error = SET_ERROR(ESRCH); 3162 dsl_dataset_rele(ds, FTAG); 3163 return (error); 3164 } 3165 ASSERT(snapds->ds_is_snapshot); 3166 3167 /* Check if the snapshot is the latest snapshot indeed. */ 3168 if (snapds != ds->ds_prev) { 3169 /* 3170 * Distinguish between the case where the only problem 3171 * is intervening snapshots (EEXIST) vs the snapshot 3172 * not being a valid target for rollback (ESRCH). 3173 */ 3174 if (snapds->ds_dir == ds->ds_dir || 3175 (dsl_dir_is_clone(ds->ds_dir) && 3176 dsl_dir_phys(ds->ds_dir)->dd_origin_obj == 3177 snapds->ds_object)) { 3178 error = SET_ERROR(EEXIST); 3179 } else { 3180 error = SET_ERROR(ESRCH); 3181 } 3182 dsl_dataset_rele(snapds, FTAG); 3183 dsl_dataset_rele(ds, FTAG); 3184 return (error); 3185 } 3186 dsl_dataset_rele(snapds, FTAG); 3187 } 3188 3189 /* must not have any bookmarks after the most recent snapshot */ 3190 if (dsl_bookmark_latest_txg(ds) > 3191 dsl_dataset_phys(ds)->ds_prev_snap_txg) { 3192 dsl_dataset_rele(ds, FTAG); 3193 return (SET_ERROR(EEXIST)); 3194 } 3195 3196 error = dsl_dataset_handoff_check(ds, ddra->ddra_owner, tx); 3197 if (error != 0) { 3198 dsl_dataset_rele(ds, FTAG); 3199 return (error); 3200 } 3201 3202 /* 3203 * Check if the snap we are rolling back to uses more than 3204 * the refquota. 3205 */ 3206 if (ds->ds_quota != 0 && 3207 dsl_dataset_phys(ds->ds_prev)->ds_referenced_bytes > ds->ds_quota) { 3208 dsl_dataset_rele(ds, FTAG); 3209 return (SET_ERROR(EDQUOT)); 3210 } 3211 3212 /* 3213 * When we do the clone swap, we will temporarily use more space 3214 * due to the refreservation (the head will no longer have any 3215 * unique space, so the entire amount of the refreservation will need 3216 * to be free). We will immediately destroy the clone, freeing 3217 * this space, but the freeing happens over many txg's. 3218 */ 3219 unused_refres_delta = (int64_t)MIN(ds->ds_reserved, 3220 dsl_dataset_phys(ds)->ds_unique_bytes); 3221 3222 if (unused_refres_delta > 0 && 3223 unused_refres_delta > 3224 dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE)) { 3225 dsl_dataset_rele(ds, FTAG); 3226 return (SET_ERROR(ENOSPC)); 3227 } 3228 3229 dsl_dataset_rele(ds, FTAG); 3230 return (0); 3231 } 3232 3233 void 3234 dsl_dataset_rollback_sync(void *arg, dmu_tx_t *tx) 3235 { 3236 dsl_dataset_rollback_arg_t *ddra = arg; 3237 dsl_pool_t *dp = dmu_tx_pool(tx); 3238 dsl_dataset_t *ds, *clone; 3239 uint64_t cloneobj; 3240 char namebuf[ZFS_MAX_DATASET_NAME_LEN]; 3241 3242 VERIFY0(dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds)); 3243 3244 dsl_dataset_name(ds->ds_prev, namebuf); 3245 fnvlist_add_string(ddra->ddra_result, "target", namebuf); 3246 3247 cloneobj = dsl_dataset_create_sync(ds->ds_dir, "%rollback", 3248 ds->ds_prev, DS_CREATE_FLAG_NODIRTY, kcred, NULL, tx); 3249 3250 VERIFY0(dsl_dataset_hold_obj(dp, cloneobj, FTAG, &clone)); 3251 3252 dsl_dataset_clone_swap_sync_impl(clone, ds, tx); 3253 dsl_dataset_zero_zil(ds, tx); 3254 3255 dsl_destroy_head_sync_impl(clone, tx); 3256 3257 dsl_dataset_rele(clone, FTAG); 3258 dsl_dataset_rele(ds, FTAG); 3259 } 3260 3261 /* 3262 * Rolls back the given filesystem or volume to the most recent snapshot. 3263 * The name of the most recent snapshot will be returned under key "target" 3264 * in the result nvlist. 3265 * 3266 * If owner != NULL: 3267 * - The existing dataset MUST be owned by the specified owner at entry 3268 * - Upon return, dataset will still be held by the same owner, whether we 3269 * succeed or not. 3270 * 3271 * This mode is required any time the existing filesystem is mounted. See 3272 * notes above zfs_suspend_fs() for further details. 3273 */ 3274 int 3275 dsl_dataset_rollback(const char *fsname, const char *tosnap, void *owner, 3276 nvlist_t *result) 3277 { 3278 dsl_dataset_rollback_arg_t ddra; 3279 3280 ddra.ddra_fsname = fsname; 3281 ddra.ddra_tosnap = tosnap; 3282 ddra.ddra_owner = owner; 3283 ddra.ddra_result = result; 3284 3285 return (dsl_sync_task(fsname, dsl_dataset_rollback_check, 3286 dsl_dataset_rollback_sync, &ddra, 3287 1, ZFS_SPACE_CHECK_RESERVED)); 3288 } 3289 3290 struct promotenode { 3291 list_node_t link; 3292 dsl_dataset_t *ds; 3293 }; 3294 3295 static int snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep); 3296 static int promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp, 3297 const void *tag); 3298 static void promote_rele(dsl_dataset_promote_arg_t *ddpa, const void *tag); 3299 3300 int 3301 dsl_dataset_promote_check(void *arg, dmu_tx_t *tx) 3302 { 3303 dsl_dataset_promote_arg_t *ddpa = arg; 3304 dsl_pool_t *dp = dmu_tx_pool(tx); 3305 dsl_dataset_t *hds; 3306 struct promotenode *snap; 3307 int err; 3308 uint64_t unused; 3309 uint64_t ss_mv_cnt; 3310 size_t max_snap_len; 3311 boolean_t conflicting_snaps; 3312 3313 err = promote_hold(ddpa, dp, FTAG); 3314 if (err != 0) 3315 return (err); 3316 3317 hds = ddpa->ddpa_clone; 3318 max_snap_len = MAXNAMELEN - strlen(ddpa->ddpa_clonename) - 1; 3319 3320 if (dsl_dataset_phys(hds)->ds_flags & DS_FLAG_NOPROMOTE) { 3321 promote_rele(ddpa, FTAG); 3322 return (SET_ERROR(EXDEV)); 3323 } 3324 3325 snap = list_head(&ddpa->shared_snaps); 3326 if (snap == NULL) { 3327 err = SET_ERROR(ENOENT); 3328 goto out; 3329 } 3330 dsl_dataset_t *const origin_ds = snap->ds; 3331 3332 /* 3333 * Encrypted clones share a DSL Crypto Key with their origin's dsl dir. 3334 * When doing a promote we must make sure the encryption root for 3335 * both the target and the target's origin does not change to avoid 3336 * needing to rewrap encryption keys 3337 */ 3338 err = dsl_dataset_promote_crypt_check(hds->ds_dir, origin_ds->ds_dir); 3339 if (err != 0) 3340 goto out; 3341 3342 /* 3343 * Compute and check the amount of space to transfer. Since this is 3344 * so expensive, don't do the preliminary check. 3345 */ 3346 if (!dmu_tx_is_syncing(tx)) { 3347 promote_rele(ddpa, FTAG); 3348 return (0); 3349 } 3350 3351 /* compute origin's new unique space */ 3352 snap = list_tail(&ddpa->clone_snaps); 3353 ASSERT(snap != NULL); 3354 ASSERT3U(dsl_dataset_phys(snap->ds)->ds_prev_snap_obj, ==, 3355 origin_ds->ds_object); 3356 dsl_deadlist_space_range(&snap->ds->ds_deadlist, 3357 dsl_dataset_phys(origin_ds)->ds_prev_snap_txg, UINT64_MAX, 3358 &ddpa->unique, &unused, &unused); 3359 3360 /* 3361 * Walk the snapshots that we are moving 3362 * 3363 * Compute space to transfer. Consider the incremental changes 3364 * to used by each snapshot: 3365 * (my used) = (prev's used) + (blocks born) - (blocks killed) 3366 * So each snapshot gave birth to: 3367 * (blocks born) = (my used) - (prev's used) + (blocks killed) 3368 * So a sequence would look like: 3369 * (uN - u(N-1) + kN) + ... + (u1 - u0 + k1) + (u0 - 0 + k0) 3370 * Which simplifies to: 3371 * uN + kN + kN-1 + ... + k1 + k0 3372 * Note however, if we stop before we reach the ORIGIN we get: 3373 * uN + kN + kN-1 + ... + kM - uM-1 3374 */ 3375 conflicting_snaps = B_FALSE; 3376 ss_mv_cnt = 0; 3377 ddpa->used = dsl_dataset_phys(origin_ds)->ds_referenced_bytes; 3378 ddpa->comp = dsl_dataset_phys(origin_ds)->ds_compressed_bytes; 3379 ddpa->uncomp = dsl_dataset_phys(origin_ds)->ds_uncompressed_bytes; 3380 for (snap = list_head(&ddpa->shared_snaps); snap; 3381 snap = list_next(&ddpa->shared_snaps, snap)) { 3382 uint64_t val, dlused, dlcomp, dluncomp; 3383 dsl_dataset_t *ds = snap->ds; 3384 3385 ss_mv_cnt++; 3386 3387 /* 3388 * If there are long holds, we won't be able to evict 3389 * the objset. 3390 */ 3391 if (dsl_dataset_long_held(ds)) { 3392 err = SET_ERROR(EBUSY); 3393 goto out; 3394 } 3395 3396 /* Check that the snapshot name does not conflict */ 3397 VERIFY0(dsl_dataset_get_snapname(ds)); 3398 if (strlen(ds->ds_snapname) >= max_snap_len) { 3399 err = SET_ERROR(ENAMETOOLONG); 3400 goto out; 3401 } 3402 err = dsl_dataset_snap_lookup(hds, ds->ds_snapname, &val); 3403 if (err == 0) { 3404 fnvlist_add_boolean(ddpa->err_ds, 3405 snap->ds->ds_snapname); 3406 conflicting_snaps = B_TRUE; 3407 } else if (err != ENOENT) { 3408 goto out; 3409 } 3410 3411 /* The very first snapshot does not have a deadlist */ 3412 if (dsl_dataset_phys(ds)->ds_prev_snap_obj == 0) 3413 continue; 3414 3415 dsl_deadlist_space(&ds->ds_deadlist, 3416 &dlused, &dlcomp, &dluncomp); 3417 ddpa->used += dlused; 3418 ddpa->comp += dlcomp; 3419 ddpa->uncomp += dluncomp; 3420 } 3421 3422 /* 3423 * Check that bookmarks that are being transferred don't have 3424 * name conflicts. 3425 */ 3426 for (dsl_bookmark_node_t *dbn = avl_first(&origin_ds->ds_bookmarks); 3427 dbn != NULL && dbn->dbn_phys.zbm_creation_txg <= 3428 dsl_dataset_phys(origin_ds)->ds_creation_txg; 3429 dbn = AVL_NEXT(&origin_ds->ds_bookmarks, dbn)) { 3430 if (strlen(dbn->dbn_name) >= max_snap_len) { 3431 err = SET_ERROR(ENAMETOOLONG); 3432 goto out; 3433 } 3434 zfs_bookmark_phys_t bm; 3435 err = dsl_bookmark_lookup_impl(ddpa->ddpa_clone, 3436 dbn->dbn_name, &bm); 3437 3438 if (err == 0) { 3439 fnvlist_add_boolean(ddpa->err_ds, dbn->dbn_name); 3440 conflicting_snaps = B_TRUE; 3441 } else if (err == ESRCH) { 3442 err = 0; 3443 } 3444 if (err != 0) { 3445 goto out; 3446 } 3447 } 3448 3449 /* 3450 * In order to return the full list of conflicting snapshots, we check 3451 * whether there was a conflict after traversing all of them. 3452 */ 3453 if (conflicting_snaps) { 3454 err = SET_ERROR(EEXIST); 3455 goto out; 3456 } 3457 3458 /* 3459 * If we are a clone of a clone then we never reached ORIGIN, 3460 * so we need to subtract out the clone origin's used space. 3461 */ 3462 if (ddpa->origin_origin) { 3463 ddpa->used -= 3464 dsl_dataset_phys(ddpa->origin_origin)->ds_referenced_bytes; 3465 ddpa->comp -= 3466 dsl_dataset_phys(ddpa->origin_origin)->ds_compressed_bytes; 3467 ddpa->uncomp -= 3468 dsl_dataset_phys(ddpa->origin_origin)-> 3469 ds_uncompressed_bytes; 3470 } 3471 3472 /* Check that there is enough space and limit headroom here */ 3473 err = dsl_dir_transfer_possible(origin_ds->ds_dir, hds->ds_dir, 3474 0, ss_mv_cnt, ddpa->used, ddpa->cr, ddpa->proc); 3475 if (err != 0) 3476 goto out; 3477 3478 /* 3479 * Compute the amounts of space that will be used by snapshots 3480 * after the promotion (for both origin and clone). For each, 3481 * it is the amount of space that will be on all of their 3482 * deadlists (that was not born before their new origin). 3483 */ 3484 if (dsl_dir_phys(hds->ds_dir)->dd_flags & DD_FLAG_USED_BREAKDOWN) { 3485 uint64_t space; 3486 3487 /* 3488 * Note, typically this will not be a clone of a clone, 3489 * so dd_origin_txg will be < TXG_INITIAL, so 3490 * these snaplist_space() -> dsl_deadlist_space_range() 3491 * calls will be fast because they do not have to 3492 * iterate over all bps. 3493 */ 3494 snap = list_head(&ddpa->origin_snaps); 3495 if (snap == NULL) { 3496 err = SET_ERROR(ENOENT); 3497 goto out; 3498 } 3499 err = snaplist_space(&ddpa->shared_snaps, 3500 snap->ds->ds_dir->dd_origin_txg, &ddpa->cloneusedsnap); 3501 if (err != 0) 3502 goto out; 3503 3504 err = snaplist_space(&ddpa->clone_snaps, 3505 snap->ds->ds_dir->dd_origin_txg, &space); 3506 if (err != 0) 3507 goto out; 3508 ddpa->cloneusedsnap += space; 3509 } 3510 if (dsl_dir_phys(origin_ds->ds_dir)->dd_flags & 3511 DD_FLAG_USED_BREAKDOWN) { 3512 err = snaplist_space(&ddpa->origin_snaps, 3513 dsl_dataset_phys(origin_ds)->ds_creation_txg, 3514 &ddpa->originusedsnap); 3515 if (err != 0) 3516 goto out; 3517 } 3518 3519 out: 3520 promote_rele(ddpa, FTAG); 3521 return (err); 3522 } 3523 3524 void 3525 dsl_dataset_promote_sync(void *arg, dmu_tx_t *tx) 3526 { 3527 dsl_dataset_promote_arg_t *ddpa = arg; 3528 dsl_pool_t *dp = dmu_tx_pool(tx); 3529 dsl_dataset_t *hds; 3530 struct promotenode *snap; 3531 dsl_dataset_t *origin_ds; 3532 dsl_dataset_t *origin_head; 3533 dsl_dir_t *dd; 3534 dsl_dir_t *odd = NULL; 3535 uint64_t oldnext_obj; 3536 int64_t delta; 3537 3538 ASSERT(nvlist_empty(ddpa->err_ds)); 3539 3540 VERIFY0(promote_hold(ddpa, dp, FTAG)); 3541 hds = ddpa->ddpa_clone; 3542 3543 ASSERT0(dsl_dataset_phys(hds)->ds_flags & DS_FLAG_NOPROMOTE); 3544 3545 snap = list_head(&ddpa->shared_snaps); 3546 origin_ds = snap->ds; 3547 dd = hds->ds_dir; 3548 3549 snap = list_head(&ddpa->origin_snaps); 3550 origin_head = snap->ds; 3551 3552 /* 3553 * We need to explicitly open odd, since origin_ds's dd will be 3554 * changing. 3555 */ 3556 VERIFY0(dsl_dir_hold_obj(dp, origin_ds->ds_dir->dd_object, 3557 NULL, FTAG, &odd)); 3558 3559 dsl_dataset_promote_crypt_sync(hds->ds_dir, odd, tx); 3560 3561 /* change origin's next snap */ 3562 dmu_buf_will_dirty(origin_ds->ds_dbuf, tx); 3563 oldnext_obj = dsl_dataset_phys(origin_ds)->ds_next_snap_obj; 3564 snap = list_tail(&ddpa->clone_snaps); 3565 ASSERT3U(dsl_dataset_phys(snap->ds)->ds_prev_snap_obj, ==, 3566 origin_ds->ds_object); 3567 dsl_dataset_phys(origin_ds)->ds_next_snap_obj = snap->ds->ds_object; 3568 3569 /* change the origin's next clone */ 3570 if (dsl_dataset_phys(origin_ds)->ds_next_clones_obj) { 3571 dsl_dataset_remove_from_next_clones(origin_ds, 3572 snap->ds->ds_object, tx); 3573 VERIFY0(zap_add_int(dp->dp_meta_objset, 3574 dsl_dataset_phys(origin_ds)->ds_next_clones_obj, 3575 oldnext_obj, tx)); 3576 } 3577 3578 /* change origin */ 3579 dmu_buf_will_dirty(dd->dd_dbuf, tx); 3580 ASSERT3U(dsl_dir_phys(dd)->dd_origin_obj, ==, origin_ds->ds_object); 3581 dsl_dir_phys(dd)->dd_origin_obj = dsl_dir_phys(odd)->dd_origin_obj; 3582 dd->dd_origin_txg = origin_head->ds_dir->dd_origin_txg; 3583 dmu_buf_will_dirty(odd->dd_dbuf, tx); 3584 dsl_dir_phys(odd)->dd_origin_obj = origin_ds->ds_object; 3585 origin_head->ds_dir->dd_origin_txg = 3586 dsl_dataset_phys(origin_ds)->ds_creation_txg; 3587 3588 /* change dd_clone entries */ 3589 if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 3590 VERIFY0(zap_remove_int(dp->dp_meta_objset, 3591 dsl_dir_phys(odd)->dd_clones, hds->ds_object, tx)); 3592 VERIFY0(zap_add_int(dp->dp_meta_objset, 3593 dsl_dir_phys(ddpa->origin_origin->ds_dir)->dd_clones, 3594 hds->ds_object, tx)); 3595 3596 VERIFY0(zap_remove_int(dp->dp_meta_objset, 3597 dsl_dir_phys(ddpa->origin_origin->ds_dir)->dd_clones, 3598 origin_head->ds_object, tx)); 3599 if (dsl_dir_phys(dd)->dd_clones == 0) { 3600 dsl_dir_phys(dd)->dd_clones = 3601 zap_create(dp->dp_meta_objset, DMU_OT_DSL_CLONES, 3602 DMU_OT_NONE, 0, tx); 3603 } 3604 VERIFY0(zap_add_int(dp->dp_meta_objset, 3605 dsl_dir_phys(dd)->dd_clones, origin_head->ds_object, tx)); 3606 } 3607 3608 /* 3609 * Move bookmarks to this dir. 3610 */ 3611 dsl_bookmark_node_t *dbn_next; 3612 for (dsl_bookmark_node_t *dbn = avl_first(&origin_head->ds_bookmarks); 3613 dbn != NULL && dbn->dbn_phys.zbm_creation_txg <= 3614 dsl_dataset_phys(origin_ds)->ds_creation_txg; 3615 dbn = dbn_next) { 3616 dbn_next = AVL_NEXT(&origin_head->ds_bookmarks, dbn); 3617 3618 avl_remove(&origin_head->ds_bookmarks, dbn); 3619 VERIFY0(zap_remove(dp->dp_meta_objset, 3620 origin_head->ds_bookmarks_obj, dbn->dbn_name, tx)); 3621 3622 dsl_bookmark_node_add(hds, dbn, tx); 3623 } 3624 3625 dsl_bookmark_next_changed(hds, origin_ds, tx); 3626 3627 /* move snapshots to this dir */ 3628 for (snap = list_head(&ddpa->shared_snaps); snap; 3629 snap = list_next(&ddpa->shared_snaps, snap)) { 3630 dsl_dataset_t *ds = snap->ds; 3631 3632 /* 3633 * Property callbacks are registered to a particular 3634 * dsl_dir. Since ours is changing, evict the objset 3635 * so that they will be unregistered from the old dsl_dir. 3636 */ 3637 if (ds->ds_objset) { 3638 dmu_objset_evict(ds->ds_objset); 3639 ds->ds_objset = NULL; 3640 } 3641 3642 /* move snap name entry */ 3643 VERIFY0(dsl_dataset_get_snapname(ds)); 3644 VERIFY0(dsl_dataset_snap_remove(origin_head, 3645 ds->ds_snapname, tx, B_TRUE)); 3646 VERIFY0(zap_add(dp->dp_meta_objset, 3647 dsl_dataset_phys(hds)->ds_snapnames_zapobj, ds->ds_snapname, 3648 8, 1, &ds->ds_object, tx)); 3649 dsl_fs_ss_count_adjust(hds->ds_dir, 1, 3650 DD_FIELD_SNAPSHOT_COUNT, tx); 3651 3652 /* change containing dsl_dir */ 3653 dmu_buf_will_dirty(ds->ds_dbuf, tx); 3654 ASSERT3U(dsl_dataset_phys(ds)->ds_dir_obj, ==, odd->dd_object); 3655 dsl_dataset_phys(ds)->ds_dir_obj = dd->dd_object; 3656 ASSERT3P(ds->ds_dir, ==, odd); 3657 dsl_dir_rele(ds->ds_dir, ds); 3658 VERIFY0(dsl_dir_hold_obj(dp, dd->dd_object, 3659 NULL, ds, &ds->ds_dir)); 3660 3661 /* move any clone references */ 3662 if (dsl_dataset_phys(ds)->ds_next_clones_obj && 3663 spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 3664 zap_cursor_t zc; 3665 zap_attribute_t za; 3666 3667 for (zap_cursor_init(&zc, dp->dp_meta_objset, 3668 dsl_dataset_phys(ds)->ds_next_clones_obj); 3669 zap_cursor_retrieve(&zc, &za) == 0; 3670 zap_cursor_advance(&zc)) { 3671 dsl_dataset_t *cnds; 3672 uint64_t o; 3673 3674 if (za.za_first_integer == oldnext_obj) { 3675 /* 3676 * We've already moved the 3677 * origin's reference. 3678 */ 3679 continue; 3680 } 3681 3682 VERIFY0(dsl_dataset_hold_obj(dp, 3683 za.za_first_integer, FTAG, &cnds)); 3684 o = dsl_dir_phys(cnds->ds_dir)-> 3685 dd_head_dataset_obj; 3686 3687 VERIFY0(zap_remove_int(dp->dp_meta_objset, 3688 dsl_dir_phys(odd)->dd_clones, o, tx)); 3689 VERIFY0(zap_add_int(dp->dp_meta_objset, 3690 dsl_dir_phys(dd)->dd_clones, o, tx)); 3691 dsl_dataset_rele(cnds, FTAG); 3692 } 3693 zap_cursor_fini(&zc); 3694 } 3695 3696 ASSERT(!dsl_prop_hascb(ds)); 3697 } 3698 3699 /* 3700 * Change space accounting. 3701 * Note, pa->*usedsnap and dd_used_breakdown[SNAP] will either 3702 * both be valid, or both be 0 (resulting in delta == 0). This 3703 * is true for each of {clone,origin} independently. 3704 */ 3705 3706 delta = ddpa->cloneusedsnap - 3707 dsl_dir_phys(dd)->dd_used_breakdown[DD_USED_SNAP]; 3708 ASSERT3S(delta, >=, 0); 3709 ASSERT3U(ddpa->used, >=, delta); 3710 dsl_dir_diduse_space(dd, DD_USED_SNAP, delta, 0, 0, tx); 3711 dsl_dir_diduse_space(dd, DD_USED_HEAD, 3712 ddpa->used - delta, ddpa->comp, ddpa->uncomp, tx); 3713 3714 delta = ddpa->originusedsnap - 3715 dsl_dir_phys(odd)->dd_used_breakdown[DD_USED_SNAP]; 3716 ASSERT3S(delta, <=, 0); 3717 ASSERT3U(ddpa->used, >=, -delta); 3718 dsl_dir_diduse_space(odd, DD_USED_SNAP, delta, 0, 0, tx); 3719 dsl_dir_diduse_space(odd, DD_USED_HEAD, 3720 -ddpa->used - delta, -ddpa->comp, -ddpa->uncomp, tx); 3721 3722 dsl_dataset_phys(origin_ds)->ds_unique_bytes = ddpa->unique; 3723 3724 /* 3725 * Since livelists are specific to a clone's origin txg, they 3726 * are no longer accurate. Destroy the livelist from the clone being 3727 * promoted. If the origin dataset is a clone, destroy its livelist 3728 * as well. 3729 */ 3730 dsl_dir_remove_livelist(dd, tx, B_TRUE); 3731 dsl_dir_remove_livelist(odd, tx, B_TRUE); 3732 3733 /* log history record */ 3734 spa_history_log_internal_ds(hds, "promote", tx, " "); 3735 3736 dsl_dir_rele(odd, FTAG); 3737 promote_rele(ddpa, FTAG); 3738 3739 /* 3740 * Transfer common error blocks from old head to new head. 3741 */ 3742 if (spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_HEAD_ERRLOG)) { 3743 uint64_t old_head = origin_head->ds_object; 3744 uint64_t new_head = hds->ds_object; 3745 spa_swap_errlog(dp->dp_spa, new_head, old_head, tx); 3746 } 3747 } 3748 3749 /* 3750 * Make a list of dsl_dataset_t's for the snapshots between first_obj 3751 * (exclusive) and last_obj (inclusive). The list will be in reverse 3752 * order (last_obj will be the list_head()). If first_obj == 0, do all 3753 * snapshots back to this dataset's origin. 3754 */ 3755 static int 3756 snaplist_make(dsl_pool_t *dp, 3757 uint64_t first_obj, uint64_t last_obj, list_t *l, const void *tag) 3758 { 3759 uint64_t obj = last_obj; 3760 3761 list_create(l, sizeof (struct promotenode), 3762 offsetof(struct promotenode, link)); 3763 3764 while (obj != first_obj) { 3765 dsl_dataset_t *ds; 3766 struct promotenode *snap; 3767 int err; 3768 3769 err = dsl_dataset_hold_obj(dp, obj, tag, &ds); 3770 ASSERT(err != ENOENT); 3771 if (err != 0) 3772 return (err); 3773 3774 if (first_obj == 0) 3775 first_obj = dsl_dir_phys(ds->ds_dir)->dd_origin_obj; 3776 3777 snap = kmem_alloc(sizeof (*snap), KM_SLEEP); 3778 snap->ds = ds; 3779 list_insert_tail(l, snap); 3780 obj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 3781 } 3782 3783 return (0); 3784 } 3785 3786 static int 3787 snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep) 3788 { 3789 struct promotenode *snap; 3790 3791 *spacep = 0; 3792 for (snap = list_head(l); snap; snap = list_next(l, snap)) { 3793 uint64_t used, comp, uncomp; 3794 dsl_deadlist_space_range(&snap->ds->ds_deadlist, 3795 mintxg, UINT64_MAX, &used, &comp, &uncomp); 3796 *spacep += used; 3797 } 3798 return (0); 3799 } 3800 3801 static void 3802 snaplist_destroy(list_t *l, const void *tag) 3803 { 3804 struct promotenode *snap; 3805 3806 if (l == NULL || !list_link_active(&l->list_head)) 3807 return; 3808 3809 while ((snap = list_tail(l)) != NULL) { 3810 list_remove(l, snap); 3811 dsl_dataset_rele(snap->ds, tag); 3812 kmem_free(snap, sizeof (*snap)); 3813 } 3814 list_destroy(l); 3815 } 3816 3817 static int 3818 promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp, const void *tag) 3819 { 3820 int error; 3821 dsl_dir_t *dd; 3822 struct promotenode *snap; 3823 3824 error = dsl_dataset_hold(dp, ddpa->ddpa_clonename, tag, 3825 &ddpa->ddpa_clone); 3826 if (error != 0) 3827 return (error); 3828 dd = ddpa->ddpa_clone->ds_dir; 3829 3830 if (ddpa->ddpa_clone->ds_is_snapshot || 3831 !dsl_dir_is_clone(dd)) { 3832 dsl_dataset_rele(ddpa->ddpa_clone, tag); 3833 return (SET_ERROR(EINVAL)); 3834 } 3835 3836 error = snaplist_make(dp, 0, dsl_dir_phys(dd)->dd_origin_obj, 3837 &ddpa->shared_snaps, tag); 3838 if (error != 0) 3839 goto out; 3840 3841 error = snaplist_make(dp, 0, ddpa->ddpa_clone->ds_object, 3842 &ddpa->clone_snaps, tag); 3843 if (error != 0) 3844 goto out; 3845 3846 snap = list_head(&ddpa->shared_snaps); 3847 ASSERT3U(snap->ds->ds_object, ==, dsl_dir_phys(dd)->dd_origin_obj); 3848 error = snaplist_make(dp, dsl_dir_phys(dd)->dd_origin_obj, 3849 dsl_dir_phys(snap->ds->ds_dir)->dd_head_dataset_obj, 3850 &ddpa->origin_snaps, tag); 3851 if (error != 0) 3852 goto out; 3853 3854 if (dsl_dir_phys(snap->ds->ds_dir)->dd_origin_obj != 0) { 3855 error = dsl_dataset_hold_obj(dp, 3856 dsl_dir_phys(snap->ds->ds_dir)->dd_origin_obj, 3857 tag, &ddpa->origin_origin); 3858 if (error != 0) 3859 goto out; 3860 } 3861 out: 3862 if (error != 0) 3863 promote_rele(ddpa, tag); 3864 return (error); 3865 } 3866 3867 static void 3868 promote_rele(dsl_dataset_promote_arg_t *ddpa, const void *tag) 3869 { 3870 snaplist_destroy(&ddpa->shared_snaps, tag); 3871 snaplist_destroy(&ddpa->clone_snaps, tag); 3872 snaplist_destroy(&ddpa->origin_snaps, tag); 3873 if (ddpa->origin_origin != NULL) 3874 dsl_dataset_rele(ddpa->origin_origin, tag); 3875 dsl_dataset_rele(ddpa->ddpa_clone, tag); 3876 } 3877 3878 /* 3879 * Promote a clone. 3880 * 3881 * If it fails due to a conflicting snapshot name, "conflsnap" will be filled 3882 * in with the name. (It must be at least ZFS_MAX_DATASET_NAME_LEN bytes long.) 3883 */ 3884 int 3885 dsl_dataset_promote(const char *name, char *conflsnap) 3886 { 3887 dsl_dataset_promote_arg_t ddpa = { 0 }; 3888 uint64_t numsnaps; 3889 int error; 3890 nvpair_t *snap_pair; 3891 objset_t *os; 3892 3893 /* 3894 * We will modify space proportional to the number of 3895 * snapshots. Compute numsnaps. 3896 */ 3897 error = dmu_objset_hold(name, FTAG, &os); 3898 if (error != 0) 3899 return (error); 3900 error = zap_count(dmu_objset_pool(os)->dp_meta_objset, 3901 dsl_dataset_phys(dmu_objset_ds(os))->ds_snapnames_zapobj, 3902 &numsnaps); 3903 dmu_objset_rele(os, FTAG); 3904 if (error != 0) 3905 return (error); 3906 3907 ddpa.ddpa_clonename = name; 3908 ddpa.err_ds = fnvlist_alloc(); 3909 ddpa.cr = CRED(); 3910 ddpa.proc = curproc; 3911 3912 error = dsl_sync_task(name, dsl_dataset_promote_check, 3913 dsl_dataset_promote_sync, &ddpa, 3914 2 + numsnaps, ZFS_SPACE_CHECK_RESERVED); 3915 3916 /* 3917 * Return the first conflicting snapshot found. 3918 */ 3919 snap_pair = nvlist_next_nvpair(ddpa.err_ds, NULL); 3920 if (snap_pair != NULL && conflsnap != NULL) 3921 (void) strlcpy(conflsnap, nvpair_name(snap_pair), 3922 ZFS_MAX_DATASET_NAME_LEN); 3923 3924 fnvlist_free(ddpa.err_ds); 3925 return (error); 3926 } 3927 3928 int 3929 dsl_dataset_clone_swap_check_impl(dsl_dataset_t *clone, 3930 dsl_dataset_t *origin_head, boolean_t force, void *owner, dmu_tx_t *tx) 3931 { 3932 /* 3933 * "slack" factor for received datasets with refquota set on them. 3934 * See the bottom of this function for details on its use. 3935 */ 3936 uint64_t refquota_slack = (uint64_t)DMU_MAX_ACCESS * 3937 spa_asize_inflation; 3938 int64_t unused_refres_delta; 3939 3940 /* they should both be heads */ 3941 if (clone->ds_is_snapshot || 3942 origin_head->ds_is_snapshot) 3943 return (SET_ERROR(EINVAL)); 3944 3945 /* if we are not forcing, the branch point should be just before them */ 3946 if (!force && clone->ds_prev != origin_head->ds_prev) 3947 return (SET_ERROR(EINVAL)); 3948 3949 /* clone should be the clone (unless they are unrelated) */ 3950 if (clone->ds_prev != NULL && 3951 clone->ds_prev != clone->ds_dir->dd_pool->dp_origin_snap && 3952 origin_head->ds_dir != clone->ds_prev->ds_dir) 3953 return (SET_ERROR(EINVAL)); 3954 3955 /* the clone should be a child of the origin */ 3956 if (clone->ds_dir->dd_parent != origin_head->ds_dir) 3957 return (SET_ERROR(EINVAL)); 3958 3959 /* origin_head shouldn't be modified unless 'force' */ 3960 if (!force && 3961 dsl_dataset_modified_since_snap(origin_head, origin_head->ds_prev)) 3962 return (SET_ERROR(ETXTBSY)); 3963 3964 /* origin_head should have no long holds (e.g. is not mounted) */ 3965 if (dsl_dataset_handoff_check(origin_head, owner, tx)) 3966 return (SET_ERROR(EBUSY)); 3967 3968 /* check amount of any unconsumed refreservation */ 3969 unused_refres_delta = 3970 (int64_t)MIN(origin_head->ds_reserved, 3971 dsl_dataset_phys(origin_head)->ds_unique_bytes) - 3972 (int64_t)MIN(origin_head->ds_reserved, 3973 dsl_dataset_phys(clone)->ds_unique_bytes); 3974 3975 if (unused_refres_delta > 0 && 3976 unused_refres_delta > 3977 dsl_dir_space_available(origin_head->ds_dir, NULL, 0, TRUE)) 3978 return (SET_ERROR(ENOSPC)); 3979 3980 /* 3981 * The clone can't be too much over the head's refquota. 3982 * 3983 * To ensure that the entire refquota can be used, we allow one 3984 * transaction to exceed the refquota. Therefore, this check 3985 * needs to also allow for the space referenced to be more than the 3986 * refquota. The maximum amount of space that one transaction can use 3987 * on disk is DMU_MAX_ACCESS * spa_asize_inflation. Allowing this 3988 * overage ensures that we are able to receive a filesystem that 3989 * exceeds the refquota on the source system. 3990 * 3991 * So that overage is the refquota_slack we use below. 3992 */ 3993 if (origin_head->ds_quota != 0 && 3994 dsl_dataset_phys(clone)->ds_referenced_bytes > 3995 origin_head->ds_quota + refquota_slack) 3996 return (SET_ERROR(EDQUOT)); 3997 3998 return (0); 3999 } 4000 4001 static void 4002 dsl_dataset_swap_remap_deadlists(dsl_dataset_t *clone, 4003 dsl_dataset_t *origin, dmu_tx_t *tx) 4004 { 4005 uint64_t clone_remap_dl_obj, origin_remap_dl_obj; 4006 dsl_pool_t *dp = dmu_tx_pool(tx); 4007 4008 ASSERT(dsl_pool_sync_context(dp)); 4009 4010 clone_remap_dl_obj = dsl_dataset_get_remap_deadlist_object(clone); 4011 origin_remap_dl_obj = dsl_dataset_get_remap_deadlist_object(origin); 4012 4013 if (clone_remap_dl_obj != 0) { 4014 dsl_deadlist_close(&clone->ds_remap_deadlist); 4015 dsl_dataset_unset_remap_deadlist_object(clone, tx); 4016 } 4017 if (origin_remap_dl_obj != 0) { 4018 dsl_deadlist_close(&origin->ds_remap_deadlist); 4019 dsl_dataset_unset_remap_deadlist_object(origin, tx); 4020 } 4021 4022 if (clone_remap_dl_obj != 0) { 4023 dsl_dataset_set_remap_deadlist_object(origin, 4024 clone_remap_dl_obj, tx); 4025 dsl_deadlist_open(&origin->ds_remap_deadlist, 4026 dp->dp_meta_objset, clone_remap_dl_obj); 4027 } 4028 if (origin_remap_dl_obj != 0) { 4029 dsl_dataset_set_remap_deadlist_object(clone, 4030 origin_remap_dl_obj, tx); 4031 dsl_deadlist_open(&clone->ds_remap_deadlist, 4032 dp->dp_meta_objset, origin_remap_dl_obj); 4033 } 4034 } 4035 4036 void 4037 dsl_dataset_clone_swap_sync_impl(dsl_dataset_t *clone, 4038 dsl_dataset_t *origin_head, dmu_tx_t *tx) 4039 { 4040 dsl_pool_t *dp = dmu_tx_pool(tx); 4041 int64_t unused_refres_delta; 4042 4043 ASSERT(clone->ds_reserved == 0); 4044 /* 4045 * NOTE: On DEBUG kernels there could be a race between this and 4046 * the check function if spa_asize_inflation is adjusted... 4047 */ 4048 ASSERT(origin_head->ds_quota == 0 || 4049 dsl_dataset_phys(clone)->ds_unique_bytes <= origin_head->ds_quota + 4050 DMU_MAX_ACCESS * spa_asize_inflation); 4051 ASSERT3P(clone->ds_prev, ==, origin_head->ds_prev); 4052 4053 dsl_dir_cancel_waiters(origin_head->ds_dir); 4054 4055 /* 4056 * Swap per-dataset feature flags. 4057 */ 4058 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 4059 if (!(spa_feature_table[f].fi_flags & 4060 ZFEATURE_FLAG_PER_DATASET)) { 4061 ASSERT(!dsl_dataset_feature_is_active(clone, f)); 4062 ASSERT(!dsl_dataset_feature_is_active(origin_head, f)); 4063 continue; 4064 } 4065 4066 boolean_t clone_inuse = dsl_dataset_feature_is_active(clone, f); 4067 void *clone_feature = clone->ds_feature[f]; 4068 boolean_t origin_head_inuse = 4069 dsl_dataset_feature_is_active(origin_head, f); 4070 void *origin_head_feature = origin_head->ds_feature[f]; 4071 4072 if (clone_inuse) 4073 dsl_dataset_deactivate_feature_impl(clone, f, tx); 4074 if (origin_head_inuse) 4075 dsl_dataset_deactivate_feature_impl(origin_head, f, tx); 4076 4077 if (clone_inuse) { 4078 dsl_dataset_activate_feature(origin_head->ds_object, f, 4079 clone_feature, tx); 4080 origin_head->ds_feature[f] = clone_feature; 4081 } 4082 if (origin_head_inuse) { 4083 dsl_dataset_activate_feature(clone->ds_object, f, 4084 origin_head_feature, tx); 4085 clone->ds_feature[f] = origin_head_feature; 4086 } 4087 } 4088 4089 dmu_buf_will_dirty(clone->ds_dbuf, tx); 4090 dmu_buf_will_dirty(origin_head->ds_dbuf, tx); 4091 4092 if (clone->ds_objset != NULL) { 4093 dmu_objset_evict(clone->ds_objset); 4094 clone->ds_objset = NULL; 4095 } 4096 4097 if (origin_head->ds_objset != NULL) { 4098 dmu_objset_evict(origin_head->ds_objset); 4099 origin_head->ds_objset = NULL; 4100 } 4101 4102 unused_refres_delta = 4103 (int64_t)MIN(origin_head->ds_reserved, 4104 dsl_dataset_phys(origin_head)->ds_unique_bytes) - 4105 (int64_t)MIN(origin_head->ds_reserved, 4106 dsl_dataset_phys(clone)->ds_unique_bytes); 4107 4108 /* 4109 * Reset origin's unique bytes. 4110 */ 4111 { 4112 dsl_dataset_t *origin = clone->ds_prev; 4113 uint64_t comp, uncomp; 4114 4115 dmu_buf_will_dirty(origin->ds_dbuf, tx); 4116 dsl_deadlist_space_range(&clone->ds_deadlist, 4117 dsl_dataset_phys(origin)->ds_prev_snap_txg, UINT64_MAX, 4118 &dsl_dataset_phys(origin)->ds_unique_bytes, &comp, &uncomp); 4119 } 4120 4121 /* swap blkptrs */ 4122 { 4123 rrw_enter(&clone->ds_bp_rwlock, RW_WRITER, FTAG); 4124 rrw_enter(&origin_head->ds_bp_rwlock, RW_WRITER, FTAG); 4125 blkptr_t tmp; 4126 tmp = dsl_dataset_phys(origin_head)->ds_bp; 4127 dsl_dataset_phys(origin_head)->ds_bp = 4128 dsl_dataset_phys(clone)->ds_bp; 4129 dsl_dataset_phys(clone)->ds_bp = tmp; 4130 rrw_exit(&origin_head->ds_bp_rwlock, FTAG); 4131 rrw_exit(&clone->ds_bp_rwlock, FTAG); 4132 } 4133 4134 /* set dd_*_bytes */ 4135 { 4136 int64_t dused, dcomp, duncomp; 4137 uint64_t cdl_used, cdl_comp, cdl_uncomp; 4138 uint64_t odl_used, odl_comp, odl_uncomp; 4139 4140 ASSERT3U(dsl_dir_phys(clone->ds_dir)-> 4141 dd_used_breakdown[DD_USED_SNAP], ==, 0); 4142 4143 dsl_deadlist_space(&clone->ds_deadlist, 4144 &cdl_used, &cdl_comp, &cdl_uncomp); 4145 dsl_deadlist_space(&origin_head->ds_deadlist, 4146 &odl_used, &odl_comp, &odl_uncomp); 4147 4148 dused = dsl_dataset_phys(clone)->ds_referenced_bytes + 4149 cdl_used - 4150 (dsl_dataset_phys(origin_head)->ds_referenced_bytes + 4151 odl_used); 4152 dcomp = dsl_dataset_phys(clone)->ds_compressed_bytes + 4153 cdl_comp - 4154 (dsl_dataset_phys(origin_head)->ds_compressed_bytes + 4155 odl_comp); 4156 duncomp = dsl_dataset_phys(clone)->ds_uncompressed_bytes + 4157 cdl_uncomp - 4158 (dsl_dataset_phys(origin_head)->ds_uncompressed_bytes + 4159 odl_uncomp); 4160 4161 dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_HEAD, 4162 dused, dcomp, duncomp, tx); 4163 dsl_dir_diduse_space(clone->ds_dir, DD_USED_HEAD, 4164 -dused, -dcomp, -duncomp, tx); 4165 4166 /* 4167 * The difference in the space used by snapshots is the 4168 * difference in snapshot space due to the head's 4169 * deadlist (since that's the only thing that's 4170 * changing that affects the snapused). 4171 */ 4172 dsl_deadlist_space_range(&clone->ds_deadlist, 4173 origin_head->ds_dir->dd_origin_txg, UINT64_MAX, 4174 &cdl_used, &cdl_comp, &cdl_uncomp); 4175 dsl_deadlist_space_range(&origin_head->ds_deadlist, 4176 origin_head->ds_dir->dd_origin_txg, UINT64_MAX, 4177 &odl_used, &odl_comp, &odl_uncomp); 4178 dsl_dir_transfer_space(origin_head->ds_dir, cdl_used - odl_used, 4179 DD_USED_HEAD, DD_USED_SNAP, tx); 4180 } 4181 4182 /* swap ds_*_bytes */ 4183 SWITCH64(dsl_dataset_phys(origin_head)->ds_referenced_bytes, 4184 dsl_dataset_phys(clone)->ds_referenced_bytes); 4185 SWITCH64(dsl_dataset_phys(origin_head)->ds_compressed_bytes, 4186 dsl_dataset_phys(clone)->ds_compressed_bytes); 4187 SWITCH64(dsl_dataset_phys(origin_head)->ds_uncompressed_bytes, 4188 dsl_dataset_phys(clone)->ds_uncompressed_bytes); 4189 SWITCH64(dsl_dataset_phys(origin_head)->ds_unique_bytes, 4190 dsl_dataset_phys(clone)->ds_unique_bytes); 4191 4192 /* apply any parent delta for change in unconsumed refreservation */ 4193 dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_REFRSRV, 4194 unused_refres_delta, 0, 0, tx); 4195 4196 /* 4197 * Swap deadlists. 4198 */ 4199 dsl_deadlist_close(&clone->ds_deadlist); 4200 dsl_deadlist_close(&origin_head->ds_deadlist); 4201 SWITCH64(dsl_dataset_phys(origin_head)->ds_deadlist_obj, 4202 dsl_dataset_phys(clone)->ds_deadlist_obj); 4203 dsl_deadlist_open(&clone->ds_deadlist, dp->dp_meta_objset, 4204 dsl_dataset_phys(clone)->ds_deadlist_obj); 4205 dsl_deadlist_open(&origin_head->ds_deadlist, dp->dp_meta_objset, 4206 dsl_dataset_phys(origin_head)->ds_deadlist_obj); 4207 dsl_dataset_swap_remap_deadlists(clone, origin_head, tx); 4208 4209 /* 4210 * If there is a bookmark at the origin, its "next dataset" is 4211 * changing, so we need to reset its FBN. 4212 */ 4213 dsl_bookmark_next_changed(origin_head, origin_head->ds_prev, tx); 4214 4215 dsl_scan_ds_clone_swapped(origin_head, clone, tx); 4216 4217 /* 4218 * Destroy any livelists associated with the clone or the origin, 4219 * since after the swap the corresponding livelists are no longer 4220 * valid. 4221 */ 4222 dsl_dir_remove_livelist(clone->ds_dir, tx, B_TRUE); 4223 dsl_dir_remove_livelist(origin_head->ds_dir, tx, B_TRUE); 4224 4225 spa_history_log_internal_ds(clone, "clone swap", tx, 4226 "parent=%s", origin_head->ds_dir->dd_myname); 4227 } 4228 4229 /* 4230 * Given a pool name and a dataset object number in that pool, 4231 * return the name of that dataset. 4232 */ 4233 int 4234 dsl_dsobj_to_dsname(char *pname, uint64_t obj, char *buf) 4235 { 4236 dsl_pool_t *dp; 4237 dsl_dataset_t *ds; 4238 int error; 4239 4240 error = dsl_pool_hold(pname, FTAG, &dp); 4241 if (error != 0) 4242 return (error); 4243 4244 error = dsl_dataset_hold_obj(dp, obj, FTAG, &ds); 4245 if (error == 0) { 4246 dsl_dataset_name(ds, buf); 4247 dsl_dataset_rele(ds, FTAG); 4248 } 4249 dsl_pool_rele(dp, FTAG); 4250 4251 return (error); 4252 } 4253 4254 int 4255 dsl_dataset_check_quota(dsl_dataset_t *ds, boolean_t check_quota, 4256 uint64_t asize, uint64_t inflight, uint64_t *used, uint64_t *ref_rsrv) 4257 { 4258 int error = 0; 4259 4260 ASSERT3S(asize, >, 0); 4261 4262 /* 4263 * *ref_rsrv is the portion of asize that will come from any 4264 * unconsumed refreservation space. 4265 */ 4266 *ref_rsrv = 0; 4267 4268 mutex_enter(&ds->ds_lock); 4269 /* 4270 * Make a space adjustment for reserved bytes. 4271 */ 4272 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes) { 4273 ASSERT3U(*used, >=, 4274 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes); 4275 *used -= 4276 (ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes); 4277 *ref_rsrv = 4278 asize - MIN(asize, parent_delta(ds, asize + inflight)); 4279 } 4280 4281 if (!check_quota || ds->ds_quota == 0) { 4282 mutex_exit(&ds->ds_lock); 4283 return (0); 4284 } 4285 /* 4286 * If they are requesting more space, and our current estimate 4287 * is over quota, they get to try again unless the actual 4288 * on-disk is over quota and there are no pending changes (which 4289 * may free up space for us). 4290 */ 4291 if (dsl_dataset_phys(ds)->ds_referenced_bytes + inflight >= 4292 ds->ds_quota) { 4293 if (inflight > 0 || 4294 dsl_dataset_phys(ds)->ds_referenced_bytes < ds->ds_quota) 4295 error = SET_ERROR(ERESTART); 4296 else 4297 error = SET_ERROR(EDQUOT); 4298 } 4299 mutex_exit(&ds->ds_lock); 4300 4301 return (error); 4302 } 4303 4304 typedef struct dsl_dataset_set_qr_arg { 4305 const char *ddsqra_name; 4306 zprop_source_t ddsqra_source; 4307 uint64_t ddsqra_value; 4308 } dsl_dataset_set_qr_arg_t; 4309 4310 4311 static int 4312 dsl_dataset_set_refquota_check(void *arg, dmu_tx_t *tx) 4313 { 4314 dsl_dataset_set_qr_arg_t *ddsqra = arg; 4315 dsl_pool_t *dp = dmu_tx_pool(tx); 4316 dsl_dataset_t *ds; 4317 int error; 4318 uint64_t newval; 4319 4320 if (spa_version(dp->dp_spa) < SPA_VERSION_REFQUOTA) 4321 return (SET_ERROR(ENOTSUP)); 4322 4323 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds); 4324 if (error != 0) 4325 return (error); 4326 4327 if (ds->ds_is_snapshot) { 4328 dsl_dataset_rele(ds, FTAG); 4329 return (SET_ERROR(EINVAL)); 4330 } 4331 4332 error = dsl_prop_predict(ds->ds_dir, 4333 zfs_prop_to_name(ZFS_PROP_REFQUOTA), 4334 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval); 4335 if (error != 0) { 4336 dsl_dataset_rele(ds, FTAG); 4337 return (error); 4338 } 4339 4340 if (newval == 0) { 4341 dsl_dataset_rele(ds, FTAG); 4342 return (0); 4343 } 4344 4345 if (newval < dsl_dataset_phys(ds)->ds_referenced_bytes || 4346 newval < ds->ds_reserved) { 4347 dsl_dataset_rele(ds, FTAG); 4348 return (SET_ERROR(ENOSPC)); 4349 } 4350 4351 dsl_dataset_rele(ds, FTAG); 4352 return (0); 4353 } 4354 4355 static void 4356 dsl_dataset_set_refquota_sync(void *arg, dmu_tx_t *tx) 4357 { 4358 dsl_dataset_set_qr_arg_t *ddsqra = arg; 4359 dsl_pool_t *dp = dmu_tx_pool(tx); 4360 dsl_dataset_t *ds = NULL; 4361 uint64_t newval; 4362 4363 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds)); 4364 4365 dsl_prop_set_sync_impl(ds, 4366 zfs_prop_to_name(ZFS_PROP_REFQUOTA), 4367 ddsqra->ddsqra_source, sizeof (ddsqra->ddsqra_value), 1, 4368 &ddsqra->ddsqra_value, tx); 4369 4370 VERIFY0(dsl_prop_get_int_ds(ds, 4371 zfs_prop_to_name(ZFS_PROP_REFQUOTA), &newval)); 4372 4373 if (ds->ds_quota != newval) { 4374 dmu_buf_will_dirty(ds->ds_dbuf, tx); 4375 ds->ds_quota = newval; 4376 } 4377 dsl_dataset_rele(ds, FTAG); 4378 } 4379 4380 int 4381 dsl_dataset_set_refquota(const char *dsname, zprop_source_t source, 4382 uint64_t refquota) 4383 { 4384 dsl_dataset_set_qr_arg_t ddsqra; 4385 4386 ddsqra.ddsqra_name = dsname; 4387 ddsqra.ddsqra_source = source; 4388 ddsqra.ddsqra_value = refquota; 4389 4390 return (dsl_sync_task(dsname, dsl_dataset_set_refquota_check, 4391 dsl_dataset_set_refquota_sync, &ddsqra, 0, 4392 ZFS_SPACE_CHECK_EXTRA_RESERVED)); 4393 } 4394 4395 static int 4396 dsl_dataset_set_refreservation_check(void *arg, dmu_tx_t *tx) 4397 { 4398 dsl_dataset_set_qr_arg_t *ddsqra = arg; 4399 dsl_pool_t *dp = dmu_tx_pool(tx); 4400 dsl_dataset_t *ds; 4401 int error; 4402 uint64_t newval, unique; 4403 4404 if (spa_version(dp->dp_spa) < SPA_VERSION_REFRESERVATION) 4405 return (SET_ERROR(ENOTSUP)); 4406 4407 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds); 4408 if (error != 0) 4409 return (error); 4410 4411 if (ds->ds_is_snapshot) { 4412 dsl_dataset_rele(ds, FTAG); 4413 return (SET_ERROR(EINVAL)); 4414 } 4415 4416 error = dsl_prop_predict(ds->ds_dir, 4417 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 4418 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval); 4419 if (error != 0) { 4420 dsl_dataset_rele(ds, FTAG); 4421 return (error); 4422 } 4423 4424 /* 4425 * If we are doing the preliminary check in open context, the 4426 * space estimates may be inaccurate. 4427 */ 4428 if (!dmu_tx_is_syncing(tx)) { 4429 dsl_dataset_rele(ds, FTAG); 4430 return (0); 4431 } 4432 4433 mutex_enter(&ds->ds_lock); 4434 if (!DS_UNIQUE_IS_ACCURATE(ds)) 4435 dsl_dataset_recalc_head_uniq(ds); 4436 unique = dsl_dataset_phys(ds)->ds_unique_bytes; 4437 mutex_exit(&ds->ds_lock); 4438 4439 if (MAX(unique, newval) > MAX(unique, ds->ds_reserved)) { 4440 uint64_t delta = MAX(unique, newval) - 4441 MAX(unique, ds->ds_reserved); 4442 4443 if (delta > 4444 dsl_dir_space_available(ds->ds_dir, NULL, 0, B_TRUE) || 4445 (ds->ds_quota > 0 && newval > ds->ds_quota)) { 4446 dsl_dataset_rele(ds, FTAG); 4447 return (SET_ERROR(ENOSPC)); 4448 } 4449 } 4450 4451 dsl_dataset_rele(ds, FTAG); 4452 return (0); 4453 } 4454 4455 void 4456 dsl_dataset_set_refreservation_sync_impl(dsl_dataset_t *ds, 4457 zprop_source_t source, uint64_t value, dmu_tx_t *tx) 4458 { 4459 uint64_t newval; 4460 uint64_t unique; 4461 int64_t delta; 4462 4463 dsl_prop_set_sync_impl(ds, zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 4464 source, sizeof (value), 1, &value, tx); 4465 4466 VERIFY0(dsl_prop_get_int_ds(ds, 4467 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), &newval)); 4468 4469 dmu_buf_will_dirty(ds->ds_dbuf, tx); 4470 mutex_enter(&ds->ds_dir->dd_lock); 4471 mutex_enter(&ds->ds_lock); 4472 ASSERT(DS_UNIQUE_IS_ACCURATE(ds)); 4473 unique = dsl_dataset_phys(ds)->ds_unique_bytes; 4474 delta = MAX(0, (int64_t)(newval - unique)) - 4475 MAX(0, (int64_t)(ds->ds_reserved - unique)); 4476 ds->ds_reserved = newval; 4477 mutex_exit(&ds->ds_lock); 4478 4479 dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV, delta, 0, 0, tx); 4480 mutex_exit(&ds->ds_dir->dd_lock); 4481 } 4482 4483 static void 4484 dsl_dataset_set_refreservation_sync(void *arg, dmu_tx_t *tx) 4485 { 4486 dsl_dataset_set_qr_arg_t *ddsqra = arg; 4487 dsl_pool_t *dp = dmu_tx_pool(tx); 4488 dsl_dataset_t *ds = NULL; 4489 4490 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds)); 4491 dsl_dataset_set_refreservation_sync_impl(ds, 4492 ddsqra->ddsqra_source, ddsqra->ddsqra_value, tx); 4493 dsl_dataset_rele(ds, FTAG); 4494 } 4495 4496 int 4497 dsl_dataset_set_refreservation(const char *dsname, zprop_source_t source, 4498 uint64_t refreservation) 4499 { 4500 dsl_dataset_set_qr_arg_t ddsqra; 4501 4502 ddsqra.ddsqra_name = dsname; 4503 ddsqra.ddsqra_source = source; 4504 ddsqra.ddsqra_value = refreservation; 4505 4506 return (dsl_sync_task(dsname, dsl_dataset_set_refreservation_check, 4507 dsl_dataset_set_refreservation_sync, &ddsqra, 0, 4508 ZFS_SPACE_CHECK_EXTRA_RESERVED)); 4509 } 4510 4511 typedef struct dsl_dataset_set_compression_arg { 4512 const char *ddsca_name; 4513 zprop_source_t ddsca_source; 4514 uint64_t ddsca_value; 4515 } dsl_dataset_set_compression_arg_t; 4516 4517 static int 4518 dsl_dataset_set_compression_check(void *arg, dmu_tx_t *tx) 4519 { 4520 dsl_dataset_set_compression_arg_t *ddsca = arg; 4521 dsl_pool_t *dp = dmu_tx_pool(tx); 4522 4523 uint64_t compval = ZIO_COMPRESS_ALGO(ddsca->ddsca_value); 4524 spa_feature_t f = zio_compress_to_feature(compval); 4525 4526 if (f == SPA_FEATURE_NONE) 4527 return (SET_ERROR(EINVAL)); 4528 4529 if (!spa_feature_is_enabled(dp->dp_spa, f)) 4530 return (SET_ERROR(ENOTSUP)); 4531 4532 return (0); 4533 } 4534 4535 static void 4536 dsl_dataset_set_compression_sync(void *arg, dmu_tx_t *tx) 4537 { 4538 dsl_dataset_set_compression_arg_t *ddsca = arg; 4539 dsl_pool_t *dp = dmu_tx_pool(tx); 4540 dsl_dataset_t *ds = NULL; 4541 4542 uint64_t compval = ZIO_COMPRESS_ALGO(ddsca->ddsca_value); 4543 spa_feature_t f = zio_compress_to_feature(compval); 4544 ASSERT3S(f, !=, SPA_FEATURE_NONE); 4545 ASSERT3S(spa_feature_table[f].fi_type, ==, ZFEATURE_TYPE_BOOLEAN); 4546 4547 VERIFY0(dsl_dataset_hold(dp, ddsca->ddsca_name, FTAG, &ds)); 4548 if (zfeature_active(f, ds->ds_feature[f]) != B_TRUE) { 4549 ds->ds_feature_activation[f] = (void *)B_TRUE; 4550 dsl_dataset_activate_feature(ds->ds_object, f, 4551 ds->ds_feature_activation[f], tx); 4552 ds->ds_feature[f] = ds->ds_feature_activation[f]; 4553 } 4554 dsl_dataset_rele(ds, FTAG); 4555 } 4556 4557 int 4558 dsl_dataset_set_compression(const char *dsname, zprop_source_t source, 4559 uint64_t compression) 4560 { 4561 dsl_dataset_set_compression_arg_t ddsca; 4562 4563 /* 4564 * The sync task is only required for zstd in order to activate 4565 * the feature flag when the property is first set. 4566 */ 4567 if (ZIO_COMPRESS_ALGO(compression) != ZIO_COMPRESS_ZSTD) 4568 return (0); 4569 4570 ddsca.ddsca_name = dsname; 4571 ddsca.ddsca_source = source; 4572 ddsca.ddsca_value = compression; 4573 4574 return (dsl_sync_task(dsname, dsl_dataset_set_compression_check, 4575 dsl_dataset_set_compression_sync, &ddsca, 0, 4576 ZFS_SPACE_CHECK_EXTRA_RESERVED)); 4577 } 4578 4579 /* 4580 * Return (in *usedp) the amount of space referenced by "new" that was not 4581 * referenced at the time the bookmark corresponds to. "New" may be a 4582 * snapshot or a head. The bookmark must be before new, in 4583 * new's filesystem (or its origin) -- caller verifies this. 4584 * 4585 * The written space is calculated by considering two components: First, we 4586 * ignore any freed space, and calculate the written as new's used space 4587 * minus old's used space. Next, we add in the amount of space that was freed 4588 * between the two time points, thus reducing new's used space relative to 4589 * old's. Specifically, this is the space that was born before 4590 * zbm_creation_txg, and freed before new (ie. on new's deadlist or a 4591 * previous deadlist). 4592 * 4593 * space freed [---------------------] 4594 * snapshots ---O-------O--------O-------O------ 4595 * bookmark new 4596 * 4597 * Note, the bookmark's zbm_*_bytes_refd must be valid, but if the HAS_FBN 4598 * flag is not set, we will calculate the freed_before_next based on the 4599 * next snapshot's deadlist, rather than using zbm_*_freed_before_next_snap. 4600 */ 4601 static int 4602 dsl_dataset_space_written_impl(zfs_bookmark_phys_t *bmp, 4603 dsl_dataset_t *new, uint64_t *usedp, uint64_t *compp, uint64_t *uncompp) 4604 { 4605 int err = 0; 4606 dsl_pool_t *dp = new->ds_dir->dd_pool; 4607 4608 ASSERT(dsl_pool_config_held(dp)); 4609 if (dsl_dataset_is_snapshot(new)) { 4610 ASSERT3U(bmp->zbm_creation_txg, <, 4611 dsl_dataset_phys(new)->ds_creation_txg); 4612 } 4613 4614 *usedp = 0; 4615 *usedp += dsl_dataset_phys(new)->ds_referenced_bytes; 4616 *usedp -= bmp->zbm_referenced_bytes_refd; 4617 4618 *compp = 0; 4619 *compp += dsl_dataset_phys(new)->ds_compressed_bytes; 4620 *compp -= bmp->zbm_compressed_bytes_refd; 4621 4622 *uncompp = 0; 4623 *uncompp += dsl_dataset_phys(new)->ds_uncompressed_bytes; 4624 *uncompp -= bmp->zbm_uncompressed_bytes_refd; 4625 4626 dsl_dataset_t *snap = new; 4627 4628 while (dsl_dataset_phys(snap)->ds_prev_snap_txg > 4629 bmp->zbm_creation_txg) { 4630 uint64_t used, comp, uncomp; 4631 4632 dsl_deadlist_space_range(&snap->ds_deadlist, 4633 0, bmp->zbm_creation_txg, 4634 &used, &comp, &uncomp); 4635 *usedp += used; 4636 *compp += comp; 4637 *uncompp += uncomp; 4638 4639 uint64_t snapobj = dsl_dataset_phys(snap)->ds_prev_snap_obj; 4640 if (snap != new) 4641 dsl_dataset_rele(snap, FTAG); 4642 err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &snap); 4643 if (err != 0) 4644 break; 4645 } 4646 4647 /* 4648 * We might not have the FBN if we are calculating written from 4649 * a snapshot (because we didn't know the correct "next" snapshot 4650 * until now). 4651 */ 4652 if (bmp->zbm_flags & ZBM_FLAG_HAS_FBN) { 4653 *usedp += bmp->zbm_referenced_freed_before_next_snap; 4654 *compp += bmp->zbm_compressed_freed_before_next_snap; 4655 *uncompp += bmp->zbm_uncompressed_freed_before_next_snap; 4656 } else { 4657 ASSERT3U(dsl_dataset_phys(snap)->ds_prev_snap_txg, ==, 4658 bmp->zbm_creation_txg); 4659 uint64_t used, comp, uncomp; 4660 dsl_deadlist_space(&snap->ds_deadlist, &used, &comp, &uncomp); 4661 *usedp += used; 4662 *compp += comp; 4663 *uncompp += uncomp; 4664 } 4665 if (snap != new) 4666 dsl_dataset_rele(snap, FTAG); 4667 return (err); 4668 } 4669 4670 /* 4671 * Return (in *usedp) the amount of space written in new that was not 4672 * present at the time the bookmark corresponds to. New may be a 4673 * snapshot or the head. Old must be a bookmark before new, in 4674 * new's filesystem (or its origin) -- caller verifies this. 4675 */ 4676 int 4677 dsl_dataset_space_written_bookmark(zfs_bookmark_phys_t *bmp, 4678 dsl_dataset_t *new, uint64_t *usedp, uint64_t *compp, uint64_t *uncompp) 4679 { 4680 if (!(bmp->zbm_flags & ZBM_FLAG_HAS_FBN)) 4681 return (SET_ERROR(ENOTSUP)); 4682 return (dsl_dataset_space_written_impl(bmp, new, 4683 usedp, compp, uncompp)); 4684 } 4685 4686 /* 4687 * Return (in *usedp) the amount of space written in new that is not 4688 * present in oldsnap. New may be a snapshot or the head. Old must be 4689 * a snapshot before new, in new's filesystem (or its origin). If not then 4690 * fail and return EINVAL. 4691 */ 4692 int 4693 dsl_dataset_space_written(dsl_dataset_t *oldsnap, dsl_dataset_t *new, 4694 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp) 4695 { 4696 if (!dsl_dataset_is_before(new, oldsnap, 0)) 4697 return (SET_ERROR(EINVAL)); 4698 4699 zfs_bookmark_phys_t zbm = { 0 }; 4700 dsl_dataset_phys_t *dsp = dsl_dataset_phys(oldsnap); 4701 zbm.zbm_guid = dsp->ds_guid; 4702 zbm.zbm_creation_txg = dsp->ds_creation_txg; 4703 zbm.zbm_creation_time = dsp->ds_creation_time; 4704 zbm.zbm_referenced_bytes_refd = dsp->ds_referenced_bytes; 4705 zbm.zbm_compressed_bytes_refd = dsp->ds_compressed_bytes; 4706 zbm.zbm_uncompressed_bytes_refd = dsp->ds_uncompressed_bytes; 4707 4708 /* 4709 * If oldsnap is the origin (or origin's origin, ...) of new, 4710 * we can't easily calculate the effective FBN. Therefore, 4711 * we do not set ZBM_FLAG_HAS_FBN, so that the _impl will calculate 4712 * it relative to the correct "next": the next snapshot towards "new", 4713 * rather than the next snapshot in oldsnap's dsl_dir. 4714 */ 4715 return (dsl_dataset_space_written_impl(&zbm, new, 4716 usedp, compp, uncompp)); 4717 } 4718 4719 /* 4720 * Return (in *usedp) the amount of space that will be reclaimed if firstsnap, 4721 * lastsnap, and all snapshots in between are deleted. 4722 * 4723 * blocks that would be freed [---------------------------] 4724 * snapshots ---O-------O--------O-------O--------O 4725 * firstsnap lastsnap 4726 * 4727 * This is the set of blocks that were born after the snap before firstsnap, 4728 * (birth > firstsnap->prev_snap_txg) and died before the snap after the 4729 * last snap (ie, is on lastsnap->ds_next->ds_deadlist or an earlier deadlist). 4730 * We calculate this by iterating over the relevant deadlists (from the snap 4731 * after lastsnap, backward to the snap after firstsnap), summing up the 4732 * space on the deadlist that was born after the snap before firstsnap. 4733 */ 4734 int 4735 dsl_dataset_space_wouldfree(dsl_dataset_t *firstsnap, 4736 dsl_dataset_t *lastsnap, 4737 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp) 4738 { 4739 int err = 0; 4740 uint64_t snapobj; 4741 dsl_pool_t *dp = firstsnap->ds_dir->dd_pool; 4742 4743 ASSERT(firstsnap->ds_is_snapshot); 4744 ASSERT(lastsnap->ds_is_snapshot); 4745 4746 /* 4747 * Check that the snapshots are in the same dsl_dir, and firstsnap 4748 * is before lastsnap. 4749 */ 4750 if (firstsnap->ds_dir != lastsnap->ds_dir || 4751 dsl_dataset_phys(firstsnap)->ds_creation_txg > 4752 dsl_dataset_phys(lastsnap)->ds_creation_txg) 4753 return (SET_ERROR(EINVAL)); 4754 4755 *usedp = *compp = *uncompp = 0; 4756 4757 snapobj = dsl_dataset_phys(lastsnap)->ds_next_snap_obj; 4758 while (snapobj != firstsnap->ds_object) { 4759 dsl_dataset_t *ds; 4760 uint64_t used, comp, uncomp; 4761 4762 err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &ds); 4763 if (err != 0) 4764 break; 4765 4766 dsl_deadlist_space_range(&ds->ds_deadlist, 4767 dsl_dataset_phys(firstsnap)->ds_prev_snap_txg, UINT64_MAX, 4768 &used, &comp, &uncomp); 4769 *usedp += used; 4770 *compp += comp; 4771 *uncompp += uncomp; 4772 4773 snapobj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 4774 ASSERT3U(snapobj, !=, 0); 4775 dsl_dataset_rele(ds, FTAG); 4776 } 4777 return (err); 4778 } 4779 4780 /* 4781 * Return TRUE if 'earlier' is an earlier snapshot in 'later's timeline. 4782 * For example, they could both be snapshots of the same filesystem, and 4783 * 'earlier' is before 'later'. Or 'earlier' could be the origin of 4784 * 'later's filesystem. Or 'earlier' could be an older snapshot in the origin's 4785 * filesystem. Or 'earlier' could be the origin's origin. 4786 * 4787 * If non-zero, earlier_txg is used instead of earlier's ds_creation_txg. 4788 */ 4789 boolean_t 4790 dsl_dataset_is_before(dsl_dataset_t *later, dsl_dataset_t *earlier, 4791 uint64_t earlier_txg) 4792 { 4793 dsl_pool_t *dp = later->ds_dir->dd_pool; 4794 int error; 4795 boolean_t ret; 4796 4797 ASSERT(dsl_pool_config_held(dp)); 4798 ASSERT(earlier->ds_is_snapshot || earlier_txg != 0); 4799 4800 if (earlier_txg == 0) 4801 earlier_txg = dsl_dataset_phys(earlier)->ds_creation_txg; 4802 4803 if (later->ds_is_snapshot && 4804 earlier_txg >= dsl_dataset_phys(later)->ds_creation_txg) 4805 return (B_FALSE); 4806 4807 if (later->ds_dir == earlier->ds_dir) 4808 return (B_TRUE); 4809 4810 /* 4811 * We check dd_origin_obj explicitly here rather than using 4812 * dsl_dir_is_clone() so that we will return TRUE if "earlier" 4813 * is $ORIGIN@$ORIGIN. dsl_dataset_space_written() depends on 4814 * this behavior. 4815 */ 4816 if (dsl_dir_phys(later->ds_dir)->dd_origin_obj == 0) 4817 return (B_FALSE); 4818 4819 dsl_dataset_t *origin; 4820 error = dsl_dataset_hold_obj(dp, 4821 dsl_dir_phys(later->ds_dir)->dd_origin_obj, FTAG, &origin); 4822 if (error != 0) 4823 return (B_FALSE); 4824 if (dsl_dataset_phys(origin)->ds_creation_txg == earlier_txg && 4825 origin->ds_dir == earlier->ds_dir) { 4826 dsl_dataset_rele(origin, FTAG); 4827 return (B_TRUE); 4828 } 4829 ret = dsl_dataset_is_before(origin, earlier, earlier_txg); 4830 dsl_dataset_rele(origin, FTAG); 4831 return (ret); 4832 } 4833 4834 void 4835 dsl_dataset_zapify(dsl_dataset_t *ds, dmu_tx_t *tx) 4836 { 4837 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 4838 dmu_object_zapify(mos, ds->ds_object, DMU_OT_DSL_DATASET, tx); 4839 } 4840 4841 boolean_t 4842 dsl_dataset_is_zapified(dsl_dataset_t *ds) 4843 { 4844 dmu_object_info_t doi; 4845 4846 dmu_object_info_from_db(ds->ds_dbuf, &doi); 4847 return (doi.doi_type == DMU_OTN_ZAP_METADATA); 4848 } 4849 4850 boolean_t 4851 dsl_dataset_has_resume_receive_state(dsl_dataset_t *ds) 4852 { 4853 return (dsl_dataset_is_zapified(ds) && 4854 zap_contains(ds->ds_dir->dd_pool->dp_meta_objset, 4855 ds->ds_object, DS_FIELD_RESUME_TOGUID) == 0); 4856 } 4857 4858 uint64_t 4859 dsl_dataset_get_remap_deadlist_object(dsl_dataset_t *ds) 4860 { 4861 uint64_t remap_deadlist_obj; 4862 int err; 4863 4864 if (!dsl_dataset_is_zapified(ds)) 4865 return (0); 4866 4867 err = zap_lookup(ds->ds_dir->dd_pool->dp_meta_objset, ds->ds_object, 4868 DS_FIELD_REMAP_DEADLIST, sizeof (remap_deadlist_obj), 1, 4869 &remap_deadlist_obj); 4870 4871 if (err != 0) { 4872 VERIFY3S(err, ==, ENOENT); 4873 return (0); 4874 } 4875 4876 ASSERT(remap_deadlist_obj != 0); 4877 return (remap_deadlist_obj); 4878 } 4879 4880 boolean_t 4881 dsl_dataset_remap_deadlist_exists(dsl_dataset_t *ds) 4882 { 4883 EQUIV(dsl_deadlist_is_open(&ds->ds_remap_deadlist), 4884 dsl_dataset_get_remap_deadlist_object(ds) != 0); 4885 return (dsl_deadlist_is_open(&ds->ds_remap_deadlist)); 4886 } 4887 4888 static void 4889 dsl_dataset_set_remap_deadlist_object(dsl_dataset_t *ds, uint64_t obj, 4890 dmu_tx_t *tx) 4891 { 4892 ASSERT(obj != 0); 4893 dsl_dataset_zapify(ds, tx); 4894 VERIFY0(zap_add(ds->ds_dir->dd_pool->dp_meta_objset, ds->ds_object, 4895 DS_FIELD_REMAP_DEADLIST, sizeof (obj), 1, &obj, tx)); 4896 } 4897 4898 static void 4899 dsl_dataset_unset_remap_deadlist_object(dsl_dataset_t *ds, dmu_tx_t *tx) 4900 { 4901 VERIFY0(zap_remove(ds->ds_dir->dd_pool->dp_meta_objset, 4902 ds->ds_object, DS_FIELD_REMAP_DEADLIST, tx)); 4903 } 4904 4905 void 4906 dsl_dataset_destroy_remap_deadlist(dsl_dataset_t *ds, dmu_tx_t *tx) 4907 { 4908 uint64_t remap_deadlist_object; 4909 spa_t *spa = ds->ds_dir->dd_pool->dp_spa; 4910 4911 ASSERT(dmu_tx_is_syncing(tx)); 4912 ASSERT(dsl_dataset_remap_deadlist_exists(ds)); 4913 4914 remap_deadlist_object = ds->ds_remap_deadlist.dl_object; 4915 dsl_deadlist_close(&ds->ds_remap_deadlist); 4916 dsl_deadlist_free(spa_meta_objset(spa), remap_deadlist_object, tx); 4917 dsl_dataset_unset_remap_deadlist_object(ds, tx); 4918 spa_feature_decr(spa, SPA_FEATURE_OBSOLETE_COUNTS, tx); 4919 } 4920 4921 void 4922 dsl_dataset_create_remap_deadlist(dsl_dataset_t *ds, dmu_tx_t *tx) 4923 { 4924 uint64_t remap_deadlist_obj; 4925 spa_t *spa = ds->ds_dir->dd_pool->dp_spa; 4926 4927 ASSERT(dmu_tx_is_syncing(tx)); 4928 ASSERT(MUTEX_HELD(&ds->ds_remap_deadlist_lock)); 4929 /* 4930 * Currently we only create remap deadlists when there are indirect 4931 * vdevs with referenced mappings. 4932 */ 4933 ASSERT(spa_feature_is_active(spa, SPA_FEATURE_DEVICE_REMOVAL)); 4934 4935 remap_deadlist_obj = dsl_deadlist_clone( 4936 &ds->ds_deadlist, UINT64_MAX, 4937 dsl_dataset_phys(ds)->ds_prev_snap_obj, tx); 4938 dsl_dataset_set_remap_deadlist_object(ds, 4939 remap_deadlist_obj, tx); 4940 dsl_deadlist_open(&ds->ds_remap_deadlist, spa_meta_objset(spa), 4941 remap_deadlist_obj); 4942 spa_feature_incr(spa, SPA_FEATURE_OBSOLETE_COUNTS, tx); 4943 } 4944 4945 void 4946 dsl_dataset_activate_redaction(dsl_dataset_t *ds, uint64_t *redact_snaps, 4947 uint64_t num_redact_snaps, dmu_tx_t *tx) 4948 { 4949 uint64_t dsobj = ds->ds_object; 4950 struct feature_type_uint64_array_arg *ftuaa = 4951 kmem_zalloc(sizeof (*ftuaa), KM_SLEEP); 4952 ftuaa->length = (int64_t)num_redact_snaps; 4953 if (num_redact_snaps > 0) { 4954 ftuaa->array = kmem_alloc(num_redact_snaps * sizeof (uint64_t), 4955 KM_SLEEP); 4956 memcpy(ftuaa->array, redact_snaps, num_redact_snaps * 4957 sizeof (uint64_t)); 4958 } 4959 dsl_dataset_activate_feature(dsobj, SPA_FEATURE_REDACTED_DATASETS, 4960 ftuaa, tx); 4961 ds->ds_feature[SPA_FEATURE_REDACTED_DATASETS] = ftuaa; 4962 } 4963 4964 /* 4965 * Find and return (in *oldest_dsobj) the oldest snapshot of the dsobj 4966 * dataset whose birth time is >= min_txg. 4967 */ 4968 int 4969 dsl_dataset_oldest_snapshot(spa_t *spa, uint64_t head_ds, uint64_t min_txg, 4970 uint64_t *oldest_dsobj) 4971 { 4972 dsl_dataset_t *ds; 4973 dsl_pool_t *dp = spa->spa_dsl_pool; 4974 4975 int error = dsl_dataset_hold_obj(dp, head_ds, FTAG, &ds); 4976 if (error != 0) 4977 return (error); 4978 4979 uint64_t prev_obj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 4980 uint64_t prev_obj_txg = dsl_dataset_phys(ds)->ds_prev_snap_txg; 4981 4982 while (prev_obj != 0 && min_txg < prev_obj_txg) { 4983 dsl_dataset_rele(ds, FTAG); 4984 if ((error = dsl_dataset_hold_obj(dp, prev_obj, 4985 FTAG, &ds)) != 0) 4986 return (error); 4987 prev_obj_txg = dsl_dataset_phys(ds)->ds_prev_snap_txg; 4988 prev_obj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 4989 } 4990 *oldest_dsobj = ds->ds_object; 4991 dsl_dataset_rele(ds, FTAG); 4992 return (0); 4993 } 4994 4995 ZFS_MODULE_PARAM(zfs, zfs_, max_recordsize, UINT, ZMOD_RW, 4996 "Max allowed record size"); 4997 4998 ZFS_MODULE_PARAM(zfs, zfs_, allow_redacted_dataset_mount, INT, ZMOD_RW, 4999 "Allow mounting of redacted datasets"); 5000 5001 ZFS_MODULE_PARAM(zfs, zfs_, snapshot_history_enabled, INT, ZMOD_RW, 5002 "Include snapshot events in pool history/events"); 5003 5004 EXPORT_SYMBOL(dsl_dataset_hold); 5005 EXPORT_SYMBOL(dsl_dataset_hold_flags); 5006 EXPORT_SYMBOL(dsl_dataset_hold_obj); 5007 EXPORT_SYMBOL(dsl_dataset_hold_obj_flags); 5008 EXPORT_SYMBOL(dsl_dataset_own); 5009 EXPORT_SYMBOL(dsl_dataset_own_obj); 5010 EXPORT_SYMBOL(dsl_dataset_name); 5011 EXPORT_SYMBOL(dsl_dataset_rele); 5012 EXPORT_SYMBOL(dsl_dataset_rele_flags); 5013 EXPORT_SYMBOL(dsl_dataset_disown); 5014 EXPORT_SYMBOL(dsl_dataset_tryown); 5015 EXPORT_SYMBOL(dsl_dataset_create_sync); 5016 EXPORT_SYMBOL(dsl_dataset_create_sync_dd); 5017 EXPORT_SYMBOL(dsl_dataset_snapshot_check); 5018 EXPORT_SYMBOL(dsl_dataset_snapshot_sync); 5019 EXPORT_SYMBOL(dsl_dataset_promote); 5020 EXPORT_SYMBOL(dsl_dataset_user_hold); 5021 EXPORT_SYMBOL(dsl_dataset_user_release); 5022 EXPORT_SYMBOL(dsl_dataset_get_holds); 5023 EXPORT_SYMBOL(dsl_dataset_get_blkptr); 5024 EXPORT_SYMBOL(dsl_dataset_get_spa); 5025 EXPORT_SYMBOL(dsl_dataset_modified_since_snap); 5026 EXPORT_SYMBOL(dsl_dataset_space_written); 5027 EXPORT_SYMBOL(dsl_dataset_space_wouldfree); 5028 EXPORT_SYMBOL(dsl_dataset_sync); 5029 EXPORT_SYMBOL(dsl_dataset_block_born); 5030 EXPORT_SYMBOL(dsl_dataset_block_kill); 5031 EXPORT_SYMBOL(dsl_dataset_dirty); 5032 EXPORT_SYMBOL(dsl_dataset_stats); 5033 EXPORT_SYMBOL(dsl_dataset_fast_stat); 5034 EXPORT_SYMBOL(dsl_dataset_space); 5035 EXPORT_SYMBOL(dsl_dataset_fsid_guid); 5036 EXPORT_SYMBOL(dsl_dsobj_to_dsname); 5037 EXPORT_SYMBOL(dsl_dataset_check_quota); 5038 EXPORT_SYMBOL(dsl_dataset_clone_swap_check_impl); 5039 EXPORT_SYMBOL(dsl_dataset_clone_swap_sync_impl); 5040