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 int zfs_max_recordsize = 1 * 1024 * 1024; 86 #else 87 int 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 int 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_feature_set_activation(const blkptr_t *bp, dsl_dataset_t *ds) 137 { 138 spa_feature_t f; 139 if (BP_GET_LSIZE(bp) > SPA_OLD_MAXBLOCKSIZE) { 140 ds->ds_feature_activation[SPA_FEATURE_LARGE_BLOCKS] = 141 (void *)B_TRUE; 142 } 143 144 f = zio_checksum_to_feature(BP_GET_CHECKSUM(bp)); 145 if (f != SPA_FEATURE_NONE) { 146 ASSERT3S(spa_feature_table[f].fi_type, ==, 147 ZFEATURE_TYPE_BOOLEAN); 148 ds->ds_feature_activation[f] = (void *)B_TRUE; 149 } 150 151 f = zio_compress_to_feature(BP_GET_COMPRESS(bp)); 152 if (f != SPA_FEATURE_NONE) { 153 ASSERT3S(spa_feature_table[f].fi_type, ==, 154 ZFEATURE_TYPE_BOOLEAN); 155 ds->ds_feature_activation[f] = (void *)B_TRUE; 156 } 157 } 158 159 void 160 dsl_dataset_block_born(dsl_dataset_t *ds, const blkptr_t *bp, dmu_tx_t *tx) 161 { 162 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 163 int used = bp_get_dsize_sync(spa, bp); 164 int compressed = BP_GET_PSIZE(bp); 165 int uncompressed = BP_GET_UCSIZE(bp); 166 int64_t delta; 167 168 dprintf_bp(bp, "ds=%p", ds); 169 170 ASSERT(dmu_tx_is_syncing(tx)); 171 /* It could have been compressed away to nothing */ 172 if (BP_IS_HOLE(bp) || BP_IS_REDACTED(bp)) 173 return; 174 ASSERT(BP_GET_TYPE(bp) != DMU_OT_NONE); 175 ASSERT(DMU_OT_IS_VALID(BP_GET_TYPE(bp))); 176 if (ds == NULL) { 177 dsl_pool_mos_diduse_space(tx->tx_pool, 178 used, compressed, uncompressed); 179 return; 180 } 181 182 ASSERT3U(bp->blk_birth, >, dsl_dataset_phys(ds)->ds_prev_snap_txg); 183 dmu_buf_will_dirty(ds->ds_dbuf, tx); 184 mutex_enter(&ds->ds_lock); 185 delta = parent_delta(ds, used); 186 dsl_dataset_phys(ds)->ds_referenced_bytes += used; 187 dsl_dataset_phys(ds)->ds_compressed_bytes += compressed; 188 dsl_dataset_phys(ds)->ds_uncompressed_bytes += uncompressed; 189 dsl_dataset_phys(ds)->ds_unique_bytes += used; 190 191 dsl_dataset_feature_set_activation(bp, ds); 192 193 /* 194 * Track block for livelist, but ignore embedded blocks because 195 * they do not need to be freed. 196 */ 197 if (dsl_deadlist_is_open(&ds->ds_dir->dd_livelist) && 198 bp->blk_birth > ds->ds_dir->dd_origin_txg && 199 !(BP_IS_EMBEDDED(bp))) { 200 ASSERT(dsl_dir_is_clone(ds->ds_dir)); 201 ASSERT(spa_feature_is_enabled(spa, 202 SPA_FEATURE_LIVELIST)); 203 bplist_append(&ds->ds_dir->dd_pending_allocs, bp); 204 } 205 206 mutex_exit(&ds->ds_lock); 207 dsl_dir_diduse_transfer_space(ds->ds_dir, delta, 208 compressed, uncompressed, used, 209 DD_USED_REFRSRV, DD_USED_HEAD, tx); 210 } 211 212 /* 213 * Called when the specified segment has been remapped, and is thus no 214 * longer referenced in the head dataset. The vdev must be indirect. 215 * 216 * If the segment is referenced by a snapshot, put it on the remap deadlist. 217 * Otherwise, add this segment to the obsolete spacemap. 218 */ 219 void 220 dsl_dataset_block_remapped(dsl_dataset_t *ds, uint64_t vdev, uint64_t offset, 221 uint64_t size, uint64_t birth, dmu_tx_t *tx) 222 { 223 spa_t *spa = ds->ds_dir->dd_pool->dp_spa; 224 225 ASSERT(dmu_tx_is_syncing(tx)); 226 ASSERT(birth <= tx->tx_txg); 227 ASSERT(!ds->ds_is_snapshot); 228 229 if (birth > dsl_dataset_phys(ds)->ds_prev_snap_txg) { 230 spa_vdev_indirect_mark_obsolete(spa, vdev, offset, size, tx); 231 } else { 232 blkptr_t fakebp; 233 dva_t *dva = &fakebp.blk_dva[0]; 234 235 ASSERT(ds != NULL); 236 237 mutex_enter(&ds->ds_remap_deadlist_lock); 238 if (!dsl_dataset_remap_deadlist_exists(ds)) { 239 dsl_dataset_create_remap_deadlist(ds, tx); 240 } 241 mutex_exit(&ds->ds_remap_deadlist_lock); 242 243 BP_ZERO(&fakebp); 244 fakebp.blk_birth = birth; 245 DVA_SET_VDEV(dva, vdev); 246 DVA_SET_OFFSET(dva, offset); 247 DVA_SET_ASIZE(dva, size); 248 dsl_deadlist_insert(&ds->ds_remap_deadlist, &fakebp, B_FALSE, 249 tx); 250 } 251 } 252 253 int 254 dsl_dataset_block_kill(dsl_dataset_t *ds, const blkptr_t *bp, dmu_tx_t *tx, 255 boolean_t async) 256 { 257 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 258 259 int used = bp_get_dsize_sync(spa, bp); 260 int compressed = BP_GET_PSIZE(bp); 261 int uncompressed = BP_GET_UCSIZE(bp); 262 263 if (BP_IS_HOLE(bp) || BP_IS_REDACTED(bp)) 264 return (0); 265 266 ASSERT(dmu_tx_is_syncing(tx)); 267 ASSERT(bp->blk_birth <= tx->tx_txg); 268 269 if (ds == NULL) { 270 dsl_free(tx->tx_pool, tx->tx_txg, bp); 271 dsl_pool_mos_diduse_space(tx->tx_pool, 272 -used, -compressed, -uncompressed); 273 return (used); 274 } 275 ASSERT3P(tx->tx_pool, ==, ds->ds_dir->dd_pool); 276 277 ASSERT(!ds->ds_is_snapshot); 278 dmu_buf_will_dirty(ds->ds_dbuf, tx); 279 280 /* 281 * Track block for livelist, but ignore embedded blocks because 282 * they do not need to be freed. 283 */ 284 if (dsl_deadlist_is_open(&ds->ds_dir->dd_livelist) && 285 bp->blk_birth > ds->ds_dir->dd_origin_txg && 286 !(BP_IS_EMBEDDED(bp))) { 287 ASSERT(dsl_dir_is_clone(ds->ds_dir)); 288 ASSERT(spa_feature_is_enabled(spa, 289 SPA_FEATURE_LIVELIST)); 290 bplist_append(&ds->ds_dir->dd_pending_frees, bp); 291 } 292 293 if (bp->blk_birth > dsl_dataset_phys(ds)->ds_prev_snap_txg) { 294 int64_t delta; 295 296 dprintf_bp(bp, "freeing ds=%llu", (u_longlong_t)ds->ds_object); 297 dsl_free(tx->tx_pool, tx->tx_txg, bp); 298 299 mutex_enter(&ds->ds_lock); 300 ASSERT(dsl_dataset_phys(ds)->ds_unique_bytes >= used || 301 !DS_UNIQUE_IS_ACCURATE(ds)); 302 delta = parent_delta(ds, -used); 303 dsl_dataset_phys(ds)->ds_unique_bytes -= used; 304 mutex_exit(&ds->ds_lock); 305 dsl_dir_diduse_transfer_space(ds->ds_dir, 306 delta, -compressed, -uncompressed, -used, 307 DD_USED_REFRSRV, DD_USED_HEAD, tx); 308 } else { 309 dprintf_bp(bp, "putting on dead list: %s", ""); 310 if (async) { 311 /* 312 * We are here as part of zio's write done callback, 313 * which means we're a zio interrupt thread. We can't 314 * call dsl_deadlist_insert() now because it may block 315 * waiting for I/O. Instead, put bp on the deferred 316 * queue and let dsl_pool_sync() finish the job. 317 */ 318 bplist_append(&ds->ds_pending_deadlist, bp); 319 } else { 320 dsl_deadlist_insert(&ds->ds_deadlist, bp, B_FALSE, tx); 321 } 322 ASSERT3U(ds->ds_prev->ds_object, ==, 323 dsl_dataset_phys(ds)->ds_prev_snap_obj); 324 ASSERT(dsl_dataset_phys(ds->ds_prev)->ds_num_children > 0); 325 /* if (bp->blk_birth > prev prev snap txg) prev unique += bs */ 326 if (dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj == 327 ds->ds_object && bp->blk_birth > 328 dsl_dataset_phys(ds->ds_prev)->ds_prev_snap_txg) { 329 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); 330 mutex_enter(&ds->ds_prev->ds_lock); 331 dsl_dataset_phys(ds->ds_prev)->ds_unique_bytes += used; 332 mutex_exit(&ds->ds_prev->ds_lock); 333 } 334 if (bp->blk_birth > ds->ds_dir->dd_origin_txg) { 335 dsl_dir_transfer_space(ds->ds_dir, used, 336 DD_USED_HEAD, DD_USED_SNAP, tx); 337 } 338 } 339 340 dsl_bookmark_block_killed(ds, bp, tx); 341 342 mutex_enter(&ds->ds_lock); 343 ASSERT3U(dsl_dataset_phys(ds)->ds_referenced_bytes, >=, used); 344 dsl_dataset_phys(ds)->ds_referenced_bytes -= used; 345 ASSERT3U(dsl_dataset_phys(ds)->ds_compressed_bytes, >=, compressed); 346 dsl_dataset_phys(ds)->ds_compressed_bytes -= compressed; 347 ASSERT3U(dsl_dataset_phys(ds)->ds_uncompressed_bytes, >=, uncompressed); 348 dsl_dataset_phys(ds)->ds_uncompressed_bytes -= uncompressed; 349 mutex_exit(&ds->ds_lock); 350 351 return (used); 352 } 353 354 struct feature_type_uint64_array_arg { 355 uint64_t length; 356 uint64_t *array; 357 }; 358 359 static void 360 unload_zfeature(dsl_dataset_t *ds, spa_feature_t f) 361 { 362 switch (spa_feature_table[f].fi_type) { 363 case ZFEATURE_TYPE_BOOLEAN: 364 break; 365 case ZFEATURE_TYPE_UINT64_ARRAY: 366 { 367 struct feature_type_uint64_array_arg *ftuaa = ds->ds_feature[f]; 368 kmem_free(ftuaa->array, ftuaa->length * sizeof (uint64_t)); 369 kmem_free(ftuaa, sizeof (*ftuaa)); 370 break; 371 } 372 default: 373 panic("Invalid zfeature type %d", spa_feature_table[f].fi_type); 374 } 375 } 376 377 static int 378 load_zfeature(objset_t *mos, dsl_dataset_t *ds, spa_feature_t f) 379 { 380 int err = 0; 381 switch (spa_feature_table[f].fi_type) { 382 case ZFEATURE_TYPE_BOOLEAN: 383 err = zap_contains(mos, ds->ds_object, 384 spa_feature_table[f].fi_guid); 385 if (err == 0) { 386 ds->ds_feature[f] = (void *)B_TRUE; 387 } else { 388 ASSERT3U(err, ==, ENOENT); 389 err = 0; 390 } 391 break; 392 case ZFEATURE_TYPE_UINT64_ARRAY: 393 { 394 uint64_t int_size, num_int; 395 uint64_t *data; 396 err = zap_length(mos, ds->ds_object, 397 spa_feature_table[f].fi_guid, &int_size, &num_int); 398 if (err != 0) { 399 ASSERT3U(err, ==, ENOENT); 400 err = 0; 401 break; 402 } 403 ASSERT3U(int_size, ==, sizeof (uint64_t)); 404 data = kmem_alloc(int_size * num_int, KM_SLEEP); 405 VERIFY0(zap_lookup(mos, ds->ds_object, 406 spa_feature_table[f].fi_guid, int_size, num_int, data)); 407 struct feature_type_uint64_array_arg *ftuaa = 408 kmem_alloc(sizeof (*ftuaa), KM_SLEEP); 409 ftuaa->length = num_int; 410 ftuaa->array = data; 411 ds->ds_feature[f] = ftuaa; 412 break; 413 } 414 default: 415 panic("Invalid zfeature type %d", spa_feature_table[f].fi_type); 416 } 417 return (err); 418 } 419 420 /* 421 * We have to release the fsid synchronously or we risk that a subsequent 422 * mount of the same dataset will fail to unique_insert the fsid. This 423 * failure would manifest itself as the fsid of this dataset changing 424 * between mounts which makes NFS clients quite unhappy. 425 */ 426 static void 427 dsl_dataset_evict_sync(void *dbu) 428 { 429 dsl_dataset_t *ds = dbu; 430 431 ASSERT(ds->ds_owner == NULL); 432 433 unique_remove(ds->ds_fsid_guid); 434 } 435 436 static void 437 dsl_dataset_evict_async(void *dbu) 438 { 439 dsl_dataset_t *ds = dbu; 440 441 ASSERT(ds->ds_owner == NULL); 442 443 ds->ds_dbuf = NULL; 444 445 if (ds->ds_objset != NULL) 446 dmu_objset_evict(ds->ds_objset); 447 448 if (ds->ds_prev) { 449 dsl_dataset_rele(ds->ds_prev, ds); 450 ds->ds_prev = NULL; 451 } 452 453 dsl_bookmark_fini_ds(ds); 454 455 bplist_destroy(&ds->ds_pending_deadlist); 456 if (dsl_deadlist_is_open(&ds->ds_deadlist)) 457 dsl_deadlist_close(&ds->ds_deadlist); 458 if (dsl_deadlist_is_open(&ds->ds_remap_deadlist)) 459 dsl_deadlist_close(&ds->ds_remap_deadlist); 460 if (ds->ds_dir) 461 dsl_dir_async_rele(ds->ds_dir, ds); 462 463 ASSERT(!list_link_active(&ds->ds_synced_link)); 464 465 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 466 if (dsl_dataset_feature_is_active(ds, f)) 467 unload_zfeature(ds, f); 468 } 469 470 list_destroy(&ds->ds_prop_cbs); 471 mutex_destroy(&ds->ds_lock); 472 mutex_destroy(&ds->ds_opening_lock); 473 mutex_destroy(&ds->ds_sendstream_lock); 474 mutex_destroy(&ds->ds_remap_deadlist_lock); 475 zfs_refcount_destroy(&ds->ds_longholds); 476 rrw_destroy(&ds->ds_bp_rwlock); 477 478 kmem_free(ds, sizeof (dsl_dataset_t)); 479 } 480 481 int 482 dsl_dataset_get_snapname(dsl_dataset_t *ds) 483 { 484 dsl_dataset_phys_t *headphys; 485 int err; 486 dmu_buf_t *headdbuf; 487 dsl_pool_t *dp = ds->ds_dir->dd_pool; 488 objset_t *mos = dp->dp_meta_objset; 489 490 if (ds->ds_snapname[0]) 491 return (0); 492 if (dsl_dataset_phys(ds)->ds_next_snap_obj == 0) 493 return (0); 494 495 err = dmu_bonus_hold(mos, dsl_dir_phys(ds->ds_dir)->dd_head_dataset_obj, 496 FTAG, &headdbuf); 497 if (err != 0) 498 return (err); 499 headphys = headdbuf->db_data; 500 err = zap_value_search(dp->dp_meta_objset, 501 headphys->ds_snapnames_zapobj, ds->ds_object, 0, ds->ds_snapname); 502 if (err != 0 && zfs_recover == B_TRUE) { 503 err = 0; 504 (void) snprintf(ds->ds_snapname, sizeof (ds->ds_snapname), 505 "SNAPOBJ=%llu-ERR=%d", 506 (unsigned long long)ds->ds_object, err); 507 } 508 dmu_buf_rele(headdbuf, FTAG); 509 return (err); 510 } 511 512 int 513 dsl_dataset_snap_lookup(dsl_dataset_t *ds, const char *name, uint64_t *value) 514 { 515 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 516 uint64_t snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj; 517 matchtype_t mt = 0; 518 int err; 519 520 if (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_CI_DATASET) 521 mt = MT_NORMALIZE; 522 523 err = zap_lookup_norm(mos, snapobj, name, 8, 1, 524 value, mt, NULL, 0, NULL); 525 if (err == ENOTSUP && (mt & MT_NORMALIZE)) 526 err = zap_lookup(mos, snapobj, name, 8, 1, value); 527 return (err); 528 } 529 530 int 531 dsl_dataset_snap_remove(dsl_dataset_t *ds, const char *name, dmu_tx_t *tx, 532 boolean_t adj_cnt) 533 { 534 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 535 uint64_t snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj; 536 matchtype_t mt = 0; 537 int err; 538 539 dsl_dir_snap_cmtime_update(ds->ds_dir, tx); 540 541 if (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_CI_DATASET) 542 mt = MT_NORMALIZE; 543 544 err = zap_remove_norm(mos, snapobj, name, mt, tx); 545 if (err == ENOTSUP && (mt & MT_NORMALIZE)) 546 err = zap_remove(mos, snapobj, name, tx); 547 548 if (err == 0 && adj_cnt) 549 dsl_fs_ss_count_adjust(ds->ds_dir, -1, 550 DD_FIELD_SNAPSHOT_COUNT, tx); 551 552 return (err); 553 } 554 555 boolean_t 556 dsl_dataset_try_add_ref(dsl_pool_t *dp, dsl_dataset_t *ds, const void *tag) 557 { 558 dmu_buf_t *dbuf = ds->ds_dbuf; 559 boolean_t result = B_FALSE; 560 561 if (dbuf != NULL && dmu_buf_try_add_ref(dbuf, dp->dp_meta_objset, 562 ds->ds_object, DMU_BONUS_BLKID, tag)) { 563 564 if (ds == dmu_buf_get_user(dbuf)) 565 result = B_TRUE; 566 else 567 dmu_buf_rele(dbuf, tag); 568 } 569 570 return (result); 571 } 572 573 int 574 dsl_dataset_hold_obj(dsl_pool_t *dp, uint64_t dsobj, const void *tag, 575 dsl_dataset_t **dsp) 576 { 577 objset_t *mos = dp->dp_meta_objset; 578 dmu_buf_t *dbuf; 579 dsl_dataset_t *ds; 580 int err; 581 dmu_object_info_t doi; 582 583 ASSERT(dsl_pool_config_held(dp)); 584 585 err = dmu_bonus_hold(mos, dsobj, tag, &dbuf); 586 if (err != 0) 587 return (err); 588 589 /* Make sure dsobj has the correct object type. */ 590 dmu_object_info_from_db(dbuf, &doi); 591 if (doi.doi_bonus_type != DMU_OT_DSL_DATASET) { 592 dmu_buf_rele(dbuf, tag); 593 return (SET_ERROR(EINVAL)); 594 } 595 596 ds = dmu_buf_get_user(dbuf); 597 if (ds == NULL) { 598 dsl_dataset_t *winner = NULL; 599 600 ds = kmem_zalloc(sizeof (dsl_dataset_t), KM_SLEEP); 601 ds->ds_dbuf = dbuf; 602 ds->ds_object = dsobj; 603 ds->ds_is_snapshot = dsl_dataset_phys(ds)->ds_num_children != 0; 604 list_link_init(&ds->ds_synced_link); 605 606 err = dsl_dir_hold_obj(dp, dsl_dataset_phys(ds)->ds_dir_obj, 607 NULL, ds, &ds->ds_dir); 608 if (err != 0) { 609 kmem_free(ds, sizeof (dsl_dataset_t)); 610 dmu_buf_rele(dbuf, tag); 611 return (err); 612 } 613 614 mutex_init(&ds->ds_lock, NULL, MUTEX_DEFAULT, NULL); 615 mutex_init(&ds->ds_opening_lock, NULL, MUTEX_DEFAULT, NULL); 616 mutex_init(&ds->ds_sendstream_lock, NULL, MUTEX_DEFAULT, NULL); 617 mutex_init(&ds->ds_remap_deadlist_lock, 618 NULL, MUTEX_DEFAULT, NULL); 619 rrw_init(&ds->ds_bp_rwlock, B_FALSE); 620 zfs_refcount_create(&ds->ds_longholds); 621 622 bplist_create(&ds->ds_pending_deadlist); 623 624 list_create(&ds->ds_sendstreams, sizeof (dmu_sendstatus_t), 625 offsetof(dmu_sendstatus_t, dss_link)); 626 627 list_create(&ds->ds_prop_cbs, sizeof (dsl_prop_cb_record_t), 628 offsetof(dsl_prop_cb_record_t, cbr_ds_node)); 629 630 if (doi.doi_type == DMU_OTN_ZAP_METADATA) { 631 spa_feature_t f; 632 633 for (f = 0; f < SPA_FEATURES; f++) { 634 if (!(spa_feature_table[f].fi_flags & 635 ZFEATURE_FLAG_PER_DATASET)) 636 continue; 637 err = load_zfeature(mos, ds, f); 638 } 639 } 640 641 if (!ds->ds_is_snapshot) { 642 ds->ds_snapname[0] = '\0'; 643 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) { 644 err = dsl_dataset_hold_obj(dp, 645 dsl_dataset_phys(ds)->ds_prev_snap_obj, 646 ds, &ds->ds_prev); 647 } 648 err = dsl_bookmark_init_ds(ds); 649 } else { 650 if (zfs_flags & ZFS_DEBUG_SNAPNAMES) 651 err = dsl_dataset_get_snapname(ds); 652 if (err == 0 && 653 dsl_dataset_phys(ds)->ds_userrefs_obj != 0) { 654 err = zap_count( 655 ds->ds_dir->dd_pool->dp_meta_objset, 656 dsl_dataset_phys(ds)->ds_userrefs_obj, 657 &ds->ds_userrefs); 658 } 659 } 660 661 if (err == 0 && !ds->ds_is_snapshot) { 662 err = dsl_prop_get_int_ds(ds, 663 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 664 &ds->ds_reserved); 665 if (err == 0) { 666 err = dsl_prop_get_int_ds(ds, 667 zfs_prop_to_name(ZFS_PROP_REFQUOTA), 668 &ds->ds_quota); 669 } 670 } else { 671 ds->ds_reserved = ds->ds_quota = 0; 672 } 673 674 if (err == 0 && ds->ds_dir->dd_crypto_obj != 0 && 675 ds->ds_is_snapshot && 676 zap_contains(mos, dsobj, DS_FIELD_IVSET_GUID) != 0) { 677 dp->dp_spa->spa_errata = 678 ZPOOL_ERRATA_ZOL_8308_ENCRYPTION; 679 } 680 681 dsl_deadlist_open(&ds->ds_deadlist, 682 mos, dsl_dataset_phys(ds)->ds_deadlist_obj); 683 uint64_t remap_deadlist_obj = 684 dsl_dataset_get_remap_deadlist_object(ds); 685 if (remap_deadlist_obj != 0) { 686 dsl_deadlist_open(&ds->ds_remap_deadlist, mos, 687 remap_deadlist_obj); 688 } 689 690 dmu_buf_init_user(&ds->ds_dbu, dsl_dataset_evict_sync, 691 dsl_dataset_evict_async, &ds->ds_dbuf); 692 if (err == 0) 693 winner = dmu_buf_set_user_ie(dbuf, &ds->ds_dbu); 694 695 if (err != 0 || winner != NULL) { 696 bplist_destroy(&ds->ds_pending_deadlist); 697 dsl_deadlist_close(&ds->ds_deadlist); 698 if (dsl_deadlist_is_open(&ds->ds_remap_deadlist)) 699 dsl_deadlist_close(&ds->ds_remap_deadlist); 700 dsl_bookmark_fini_ds(ds); 701 if (ds->ds_prev) 702 dsl_dataset_rele(ds->ds_prev, ds); 703 dsl_dir_rele(ds->ds_dir, ds); 704 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 705 if (dsl_dataset_feature_is_active(ds, f)) 706 unload_zfeature(ds, f); 707 } 708 709 list_destroy(&ds->ds_prop_cbs); 710 list_destroy(&ds->ds_sendstreams); 711 mutex_destroy(&ds->ds_lock); 712 mutex_destroy(&ds->ds_opening_lock); 713 mutex_destroy(&ds->ds_sendstream_lock); 714 mutex_destroy(&ds->ds_remap_deadlist_lock); 715 zfs_refcount_destroy(&ds->ds_longholds); 716 rrw_destroy(&ds->ds_bp_rwlock); 717 kmem_free(ds, sizeof (dsl_dataset_t)); 718 if (err != 0) { 719 dmu_buf_rele(dbuf, tag); 720 return (err); 721 } 722 ds = winner; 723 } else { 724 ds->ds_fsid_guid = 725 unique_insert(dsl_dataset_phys(ds)->ds_fsid_guid); 726 if (ds->ds_fsid_guid != 727 dsl_dataset_phys(ds)->ds_fsid_guid) { 728 zfs_dbgmsg("ds_fsid_guid changed from " 729 "%llx to %llx for pool %s dataset id %llu", 730 (long long) 731 dsl_dataset_phys(ds)->ds_fsid_guid, 732 (long long)ds->ds_fsid_guid, 733 spa_name(dp->dp_spa), 734 (u_longlong_t)dsobj); 735 } 736 } 737 } 738 739 ASSERT3P(ds->ds_dbuf, ==, dbuf); 740 ASSERT3P(dsl_dataset_phys(ds), ==, dbuf->db_data); 741 ASSERT(dsl_dataset_phys(ds)->ds_prev_snap_obj != 0 || 742 spa_version(dp->dp_spa) < SPA_VERSION_ORIGIN || 743 dp->dp_origin_snap == NULL || ds == dp->dp_origin_snap); 744 *dsp = ds; 745 746 return (0); 747 } 748 749 int 750 dsl_dataset_create_key_mapping(dsl_dataset_t *ds) 751 { 752 dsl_dir_t *dd = ds->ds_dir; 753 754 if (dd->dd_crypto_obj == 0) 755 return (0); 756 757 return (spa_keystore_create_mapping(dd->dd_pool->dp_spa, 758 ds, ds, &ds->ds_key_mapping)); 759 } 760 761 int 762 dsl_dataset_hold_obj_flags(dsl_pool_t *dp, uint64_t dsobj, 763 ds_hold_flags_t flags, const void *tag, dsl_dataset_t **dsp) 764 { 765 int err; 766 767 err = dsl_dataset_hold_obj(dp, dsobj, tag, dsp); 768 if (err != 0) 769 return (err); 770 771 ASSERT3P(*dsp, !=, NULL); 772 773 if (flags & DS_HOLD_FLAG_DECRYPT) { 774 err = dsl_dataset_create_key_mapping(*dsp); 775 if (err != 0) 776 dsl_dataset_rele(*dsp, tag); 777 } 778 779 return (err); 780 } 781 782 int 783 dsl_dataset_hold_flags(dsl_pool_t *dp, const char *name, ds_hold_flags_t flags, 784 const void *tag, dsl_dataset_t **dsp) 785 { 786 dsl_dir_t *dd; 787 const char *snapname; 788 uint64_t obj; 789 int err = 0; 790 dsl_dataset_t *ds; 791 792 err = dsl_dir_hold(dp, name, FTAG, &dd, &snapname); 793 if (err != 0) 794 return (err); 795 796 ASSERT(dsl_pool_config_held(dp)); 797 obj = dsl_dir_phys(dd)->dd_head_dataset_obj; 798 if (obj != 0) 799 err = dsl_dataset_hold_obj_flags(dp, obj, flags, tag, &ds); 800 else 801 err = SET_ERROR(ENOENT); 802 803 /* we may be looking for a snapshot */ 804 if (err == 0 && snapname != NULL) { 805 dsl_dataset_t *snap_ds; 806 807 if (*snapname++ != '@') { 808 dsl_dataset_rele_flags(ds, flags, tag); 809 dsl_dir_rele(dd, FTAG); 810 return (SET_ERROR(ENOENT)); 811 } 812 813 dprintf("looking for snapshot '%s'\n", snapname); 814 err = dsl_dataset_snap_lookup(ds, snapname, &obj); 815 if (err == 0) { 816 err = dsl_dataset_hold_obj_flags(dp, obj, flags, tag, 817 &snap_ds); 818 } 819 dsl_dataset_rele_flags(ds, flags, tag); 820 821 if (err == 0) { 822 mutex_enter(&snap_ds->ds_lock); 823 if (snap_ds->ds_snapname[0] == 0) 824 (void) strlcpy(snap_ds->ds_snapname, snapname, 825 sizeof (snap_ds->ds_snapname)); 826 mutex_exit(&snap_ds->ds_lock); 827 ds = snap_ds; 828 } 829 } 830 if (err == 0) 831 *dsp = ds; 832 dsl_dir_rele(dd, FTAG); 833 return (err); 834 } 835 836 int 837 dsl_dataset_hold(dsl_pool_t *dp, const char *name, const void *tag, 838 dsl_dataset_t **dsp) 839 { 840 return (dsl_dataset_hold_flags(dp, name, 0, tag, dsp)); 841 } 842 843 static int 844 dsl_dataset_own_obj_impl(dsl_pool_t *dp, uint64_t dsobj, ds_hold_flags_t flags, 845 const void *tag, boolean_t override, dsl_dataset_t **dsp) 846 { 847 int err = dsl_dataset_hold_obj_flags(dp, dsobj, flags, tag, dsp); 848 if (err != 0) 849 return (err); 850 if (!dsl_dataset_tryown(*dsp, tag, override)) { 851 dsl_dataset_rele_flags(*dsp, flags, tag); 852 *dsp = NULL; 853 return (SET_ERROR(EBUSY)); 854 } 855 return (0); 856 } 857 858 859 int 860 dsl_dataset_own_obj(dsl_pool_t *dp, uint64_t dsobj, ds_hold_flags_t flags, 861 const void *tag, dsl_dataset_t **dsp) 862 { 863 return (dsl_dataset_own_obj_impl(dp, dsobj, flags, tag, B_FALSE, dsp)); 864 } 865 866 int 867 dsl_dataset_own_obj_force(dsl_pool_t *dp, uint64_t dsobj, 868 ds_hold_flags_t flags, const void *tag, dsl_dataset_t **dsp) 869 { 870 return (dsl_dataset_own_obj_impl(dp, dsobj, flags, tag, B_TRUE, dsp)); 871 } 872 873 static int 874 dsl_dataset_own_impl(dsl_pool_t *dp, const char *name, ds_hold_flags_t flags, 875 const void *tag, boolean_t override, dsl_dataset_t **dsp) 876 { 877 int err = dsl_dataset_hold_flags(dp, name, flags, tag, dsp); 878 if (err != 0) 879 return (err); 880 if (!dsl_dataset_tryown(*dsp, tag, override)) { 881 dsl_dataset_rele_flags(*dsp, flags, tag); 882 return (SET_ERROR(EBUSY)); 883 } 884 return (0); 885 } 886 887 int 888 dsl_dataset_own_force(dsl_pool_t *dp, const char *name, ds_hold_flags_t flags, 889 const void *tag, dsl_dataset_t **dsp) 890 { 891 return (dsl_dataset_own_impl(dp, name, flags, tag, B_TRUE, dsp)); 892 } 893 894 int 895 dsl_dataset_own(dsl_pool_t *dp, const char *name, ds_hold_flags_t flags, 896 const void *tag, dsl_dataset_t **dsp) 897 { 898 return (dsl_dataset_own_impl(dp, name, flags, tag, B_FALSE, dsp)); 899 } 900 901 /* 902 * See the comment above dsl_pool_hold() for details. In summary, a long 903 * hold is used to prevent destruction of a dataset while the pool hold 904 * is dropped, allowing other concurrent operations (e.g. spa_sync()). 905 * 906 * The dataset and pool must be held when this function is called. After it 907 * is called, the pool hold may be released while the dataset is still held 908 * and accessed. 909 */ 910 void 911 dsl_dataset_long_hold(dsl_dataset_t *ds, const void *tag) 912 { 913 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool)); 914 (void) zfs_refcount_add(&ds->ds_longholds, tag); 915 } 916 917 void 918 dsl_dataset_long_rele(dsl_dataset_t *ds, const void *tag) 919 { 920 (void) zfs_refcount_remove(&ds->ds_longholds, tag); 921 } 922 923 /* Return B_TRUE if there are any long holds on this dataset. */ 924 boolean_t 925 dsl_dataset_long_held(dsl_dataset_t *ds) 926 { 927 return (!zfs_refcount_is_zero(&ds->ds_longholds)); 928 } 929 930 void 931 dsl_dataset_name(dsl_dataset_t *ds, char *name) 932 { 933 if (ds == NULL) { 934 (void) strlcpy(name, "mos", ZFS_MAX_DATASET_NAME_LEN); 935 } else { 936 dsl_dir_name(ds->ds_dir, name); 937 VERIFY0(dsl_dataset_get_snapname(ds)); 938 if (ds->ds_snapname[0]) { 939 VERIFY3U(strlcat(name, "@", ZFS_MAX_DATASET_NAME_LEN), 940 <, ZFS_MAX_DATASET_NAME_LEN); 941 /* 942 * We use a "recursive" mutex so that we 943 * can call dprintf_ds() with ds_lock held. 944 */ 945 if (!MUTEX_HELD(&ds->ds_lock)) { 946 mutex_enter(&ds->ds_lock); 947 VERIFY3U(strlcat(name, ds->ds_snapname, 948 ZFS_MAX_DATASET_NAME_LEN), <, 949 ZFS_MAX_DATASET_NAME_LEN); 950 mutex_exit(&ds->ds_lock); 951 } else { 952 VERIFY3U(strlcat(name, ds->ds_snapname, 953 ZFS_MAX_DATASET_NAME_LEN), <, 954 ZFS_MAX_DATASET_NAME_LEN); 955 } 956 } 957 } 958 } 959 960 int 961 dsl_dataset_namelen(dsl_dataset_t *ds) 962 { 963 VERIFY0(dsl_dataset_get_snapname(ds)); 964 mutex_enter(&ds->ds_lock); 965 int len = strlen(ds->ds_snapname); 966 mutex_exit(&ds->ds_lock); 967 /* add '@' if ds is a snap */ 968 if (len > 0) 969 len++; 970 len += dsl_dir_namelen(ds->ds_dir); 971 return (len); 972 } 973 974 void 975 dsl_dataset_rele(dsl_dataset_t *ds, const void *tag) 976 { 977 dmu_buf_rele(ds->ds_dbuf, tag); 978 } 979 980 void 981 dsl_dataset_remove_key_mapping(dsl_dataset_t *ds) 982 { 983 dsl_dir_t *dd = ds->ds_dir; 984 985 if (dd == NULL || dd->dd_crypto_obj == 0) 986 return; 987 988 (void) spa_keystore_remove_mapping(dd->dd_pool->dp_spa, 989 ds->ds_object, ds); 990 } 991 992 void 993 dsl_dataset_rele_flags(dsl_dataset_t *ds, ds_hold_flags_t flags, 994 const void *tag) 995 { 996 if (flags & DS_HOLD_FLAG_DECRYPT) 997 dsl_dataset_remove_key_mapping(ds); 998 999 dsl_dataset_rele(ds, tag); 1000 } 1001 1002 void 1003 dsl_dataset_disown(dsl_dataset_t *ds, ds_hold_flags_t flags, const void *tag) 1004 { 1005 ASSERT3P(ds->ds_owner, ==, tag); 1006 ASSERT(ds->ds_dbuf != NULL); 1007 1008 mutex_enter(&ds->ds_lock); 1009 ds->ds_owner = NULL; 1010 mutex_exit(&ds->ds_lock); 1011 dsl_dataset_long_rele(ds, tag); 1012 dsl_dataset_rele_flags(ds, flags, tag); 1013 } 1014 1015 boolean_t 1016 dsl_dataset_tryown(dsl_dataset_t *ds, const void *tag, boolean_t override) 1017 { 1018 boolean_t gotit = FALSE; 1019 1020 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool)); 1021 mutex_enter(&ds->ds_lock); 1022 if (ds->ds_owner == NULL && (override || !(DS_IS_INCONSISTENT(ds) || 1023 (dsl_dataset_feature_is_active(ds, 1024 SPA_FEATURE_REDACTED_DATASETS) && 1025 !zfs_allow_redacted_dataset_mount)))) { 1026 ds->ds_owner = tag; 1027 dsl_dataset_long_hold(ds, tag); 1028 gotit = TRUE; 1029 } 1030 mutex_exit(&ds->ds_lock); 1031 return (gotit); 1032 } 1033 1034 boolean_t 1035 dsl_dataset_has_owner(dsl_dataset_t *ds) 1036 { 1037 boolean_t rv; 1038 mutex_enter(&ds->ds_lock); 1039 rv = (ds->ds_owner != NULL); 1040 mutex_exit(&ds->ds_lock); 1041 return (rv); 1042 } 1043 1044 static boolean_t 1045 zfeature_active(spa_feature_t f, void *arg) 1046 { 1047 switch (spa_feature_table[f].fi_type) { 1048 case ZFEATURE_TYPE_BOOLEAN: { 1049 boolean_t val = (boolean_t)(uintptr_t)arg; 1050 ASSERT(val == B_FALSE || val == B_TRUE); 1051 return (val); 1052 } 1053 case ZFEATURE_TYPE_UINT64_ARRAY: 1054 /* 1055 * In this case, arg is a uint64_t array. The feature is active 1056 * if the array is non-null. 1057 */ 1058 return (arg != NULL); 1059 default: 1060 panic("Invalid zfeature type %d", spa_feature_table[f].fi_type); 1061 return (B_FALSE); 1062 } 1063 } 1064 1065 boolean_t 1066 dsl_dataset_feature_is_active(dsl_dataset_t *ds, spa_feature_t f) 1067 { 1068 return (zfeature_active(f, ds->ds_feature[f])); 1069 } 1070 1071 /* 1072 * The buffers passed out by this function are references to internal buffers; 1073 * they should not be freed by callers of this function, and they should not be 1074 * used after the dataset has been released. 1075 */ 1076 boolean_t 1077 dsl_dataset_get_uint64_array_feature(dsl_dataset_t *ds, spa_feature_t f, 1078 uint64_t *outlength, uint64_t **outp) 1079 { 1080 VERIFY(spa_feature_table[f].fi_type & ZFEATURE_TYPE_UINT64_ARRAY); 1081 if (!dsl_dataset_feature_is_active(ds, f)) { 1082 return (B_FALSE); 1083 } 1084 struct feature_type_uint64_array_arg *ftuaa = ds->ds_feature[f]; 1085 *outp = ftuaa->array; 1086 *outlength = ftuaa->length; 1087 return (B_TRUE); 1088 } 1089 1090 void 1091 dsl_dataset_activate_feature(uint64_t dsobj, spa_feature_t f, void *arg, 1092 dmu_tx_t *tx) 1093 { 1094 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 1095 objset_t *mos = dmu_tx_pool(tx)->dp_meta_objset; 1096 uint64_t zero = 0; 1097 1098 VERIFY(spa_feature_table[f].fi_flags & ZFEATURE_FLAG_PER_DATASET); 1099 1100 spa_feature_incr(spa, f, tx); 1101 dmu_object_zapify(mos, dsobj, DMU_OT_DSL_DATASET, tx); 1102 1103 switch (spa_feature_table[f].fi_type) { 1104 case ZFEATURE_TYPE_BOOLEAN: 1105 ASSERT3S((boolean_t)(uintptr_t)arg, ==, B_TRUE); 1106 VERIFY0(zap_add(mos, dsobj, spa_feature_table[f].fi_guid, 1107 sizeof (zero), 1, &zero, tx)); 1108 break; 1109 case ZFEATURE_TYPE_UINT64_ARRAY: 1110 { 1111 struct feature_type_uint64_array_arg *ftuaa = arg; 1112 VERIFY0(zap_add(mos, dsobj, spa_feature_table[f].fi_guid, 1113 sizeof (uint64_t), ftuaa->length, ftuaa->array, tx)); 1114 break; 1115 } 1116 default: 1117 panic("Invalid zfeature type %d", spa_feature_table[f].fi_type); 1118 } 1119 } 1120 1121 static void 1122 dsl_dataset_deactivate_feature_impl(dsl_dataset_t *ds, spa_feature_t f, 1123 dmu_tx_t *tx) 1124 { 1125 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 1126 objset_t *mos = dmu_tx_pool(tx)->dp_meta_objset; 1127 uint64_t dsobj = ds->ds_object; 1128 1129 VERIFY(spa_feature_table[f].fi_flags & ZFEATURE_FLAG_PER_DATASET); 1130 1131 VERIFY0(zap_remove(mos, dsobj, spa_feature_table[f].fi_guid, tx)); 1132 spa_feature_decr(spa, f, tx); 1133 ds->ds_feature[f] = NULL; 1134 } 1135 1136 void 1137 dsl_dataset_deactivate_feature(dsl_dataset_t *ds, spa_feature_t f, dmu_tx_t *tx) 1138 { 1139 unload_zfeature(ds, f); 1140 dsl_dataset_deactivate_feature_impl(ds, f, tx); 1141 } 1142 1143 uint64_t 1144 dsl_dataset_create_sync_dd(dsl_dir_t *dd, dsl_dataset_t *origin, 1145 dsl_crypto_params_t *dcp, uint64_t flags, dmu_tx_t *tx) 1146 { 1147 dsl_pool_t *dp = dd->dd_pool; 1148 dmu_buf_t *dbuf; 1149 dsl_dataset_phys_t *dsphys; 1150 uint64_t dsobj; 1151 objset_t *mos = dp->dp_meta_objset; 1152 1153 if (origin == NULL) 1154 origin = dp->dp_origin_snap; 1155 1156 ASSERT(origin == NULL || origin->ds_dir->dd_pool == dp); 1157 ASSERT(origin == NULL || dsl_dataset_phys(origin)->ds_num_children > 0); 1158 ASSERT(dmu_tx_is_syncing(tx)); 1159 ASSERT(dsl_dir_phys(dd)->dd_head_dataset_obj == 0); 1160 1161 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, 1162 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); 1163 VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); 1164 dmu_buf_will_dirty(dbuf, tx); 1165 dsphys = dbuf->db_data; 1166 memset(dsphys, 0, sizeof (dsl_dataset_phys_t)); 1167 dsphys->ds_dir_obj = dd->dd_object; 1168 dsphys->ds_flags = flags; 1169 dsphys->ds_fsid_guid = unique_create(); 1170 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, 1171 sizeof (dsphys->ds_guid)); 1172 dsphys->ds_snapnames_zapobj = 1173 zap_create_norm(mos, U8_TEXTPREP_TOUPPER, DMU_OT_DSL_DS_SNAP_MAP, 1174 DMU_OT_NONE, 0, tx); 1175 dsphys->ds_creation_time = gethrestime_sec(); 1176 dsphys->ds_creation_txg = tx->tx_txg == TXG_INITIAL ? 1 : tx->tx_txg; 1177 1178 if (origin == NULL) { 1179 dsphys->ds_deadlist_obj = dsl_deadlist_alloc(mos, tx); 1180 } else { 1181 dsl_dataset_t *ohds; /* head of the origin snapshot */ 1182 1183 dsphys->ds_prev_snap_obj = origin->ds_object; 1184 dsphys->ds_prev_snap_txg = 1185 dsl_dataset_phys(origin)->ds_creation_txg; 1186 dsphys->ds_referenced_bytes = 1187 dsl_dataset_phys(origin)->ds_referenced_bytes; 1188 dsphys->ds_compressed_bytes = 1189 dsl_dataset_phys(origin)->ds_compressed_bytes; 1190 dsphys->ds_uncompressed_bytes = 1191 dsl_dataset_phys(origin)->ds_uncompressed_bytes; 1192 rrw_enter(&origin->ds_bp_rwlock, RW_READER, FTAG); 1193 dsphys->ds_bp = dsl_dataset_phys(origin)->ds_bp; 1194 rrw_exit(&origin->ds_bp_rwlock, FTAG); 1195 1196 /* 1197 * Inherit flags that describe the dataset's contents 1198 * (INCONSISTENT) or properties (Case Insensitive). 1199 */ 1200 dsphys->ds_flags |= dsl_dataset_phys(origin)->ds_flags & 1201 (DS_FLAG_INCONSISTENT | DS_FLAG_CI_DATASET); 1202 1203 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 1204 if (zfeature_active(f, origin->ds_feature[f])) { 1205 dsl_dataset_activate_feature(dsobj, f, 1206 origin->ds_feature[f], tx); 1207 } 1208 } 1209 1210 dmu_buf_will_dirty(origin->ds_dbuf, tx); 1211 dsl_dataset_phys(origin)->ds_num_children++; 1212 1213 VERIFY0(dsl_dataset_hold_obj(dp, 1214 dsl_dir_phys(origin->ds_dir)->dd_head_dataset_obj, 1215 FTAG, &ohds)); 1216 dsphys->ds_deadlist_obj = dsl_deadlist_clone(&ohds->ds_deadlist, 1217 dsphys->ds_prev_snap_txg, dsphys->ds_prev_snap_obj, tx); 1218 dsl_dataset_rele(ohds, FTAG); 1219 1220 if (spa_version(dp->dp_spa) >= SPA_VERSION_NEXT_CLONES) { 1221 if (dsl_dataset_phys(origin)->ds_next_clones_obj == 0) { 1222 dsl_dataset_phys(origin)->ds_next_clones_obj = 1223 zap_create(mos, 1224 DMU_OT_NEXT_CLONES, DMU_OT_NONE, 0, tx); 1225 } 1226 VERIFY0(zap_add_int(mos, 1227 dsl_dataset_phys(origin)->ds_next_clones_obj, 1228 dsobj, tx)); 1229 } 1230 1231 dmu_buf_will_dirty(dd->dd_dbuf, tx); 1232 dsl_dir_phys(dd)->dd_origin_obj = origin->ds_object; 1233 if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 1234 if (dsl_dir_phys(origin->ds_dir)->dd_clones == 0) { 1235 dmu_buf_will_dirty(origin->ds_dir->dd_dbuf, tx); 1236 dsl_dir_phys(origin->ds_dir)->dd_clones = 1237 zap_create(mos, 1238 DMU_OT_DSL_CLONES, DMU_OT_NONE, 0, tx); 1239 } 1240 VERIFY0(zap_add_int(mos, 1241 dsl_dir_phys(origin->ds_dir)->dd_clones, 1242 dsobj, tx)); 1243 } 1244 } 1245 1246 /* handle encryption */ 1247 dsl_dataset_create_crypt_sync(dsobj, dd, origin, dcp, tx); 1248 1249 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE) 1250 dsphys->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 1251 1252 dmu_buf_rele(dbuf, FTAG); 1253 1254 dmu_buf_will_dirty(dd->dd_dbuf, tx); 1255 dsl_dir_phys(dd)->dd_head_dataset_obj = dsobj; 1256 1257 return (dsobj); 1258 } 1259 1260 static void 1261 dsl_dataset_zero_zil(dsl_dataset_t *ds, dmu_tx_t *tx) 1262 { 1263 objset_t *os; 1264 1265 VERIFY0(dmu_objset_from_ds(ds, &os)); 1266 if (memcmp(&os->os_zil_header, &zero_zil, sizeof (zero_zil)) != 0) { 1267 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1268 zio_t *zio; 1269 1270 memset(&os->os_zil_header, 0, sizeof (os->os_zil_header)); 1271 if (os->os_encrypted) 1272 os->os_next_write_raw[tx->tx_txg & TXG_MASK] = B_TRUE; 1273 1274 zio = zio_root(dp->dp_spa, NULL, NULL, ZIO_FLAG_MUSTSUCCEED); 1275 dsl_dataset_sync(ds, zio, tx); 1276 VERIFY0(zio_wait(zio)); 1277 1278 /* dsl_dataset_sync_done will drop this reference. */ 1279 dmu_buf_add_ref(ds->ds_dbuf, ds); 1280 dsl_dataset_sync_done(ds, tx); 1281 } 1282 } 1283 1284 uint64_t 1285 dsl_dataset_create_sync(dsl_dir_t *pdd, const char *lastname, 1286 dsl_dataset_t *origin, uint64_t flags, cred_t *cr, 1287 dsl_crypto_params_t *dcp, dmu_tx_t *tx) 1288 { 1289 dsl_pool_t *dp = pdd->dd_pool; 1290 uint64_t dsobj, ddobj; 1291 dsl_dir_t *dd; 1292 1293 ASSERT(dmu_tx_is_syncing(tx)); 1294 ASSERT(lastname[0] != '@'); 1295 /* 1296 * Filesystems will eventually have their origin set to dp_origin_snap, 1297 * but that's taken care of in dsl_dataset_create_sync_dd. When 1298 * creating a filesystem, this function is called with origin equal to 1299 * NULL. 1300 */ 1301 if (origin != NULL) 1302 ASSERT3P(origin, !=, dp->dp_origin_snap); 1303 1304 ddobj = dsl_dir_create_sync(dp, pdd, lastname, tx); 1305 VERIFY0(dsl_dir_hold_obj(dp, ddobj, lastname, FTAG, &dd)); 1306 1307 dsobj = dsl_dataset_create_sync_dd(dd, origin, dcp, 1308 flags & ~DS_CREATE_FLAG_NODIRTY, tx); 1309 1310 dsl_deleg_set_create_perms(dd, tx, cr); 1311 1312 /* 1313 * If we are creating a clone and the livelist feature is enabled, 1314 * add the entry DD_FIELD_LIVELIST to ZAP. 1315 */ 1316 if (origin != NULL && 1317 spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_LIVELIST)) { 1318 objset_t *mos = dd->dd_pool->dp_meta_objset; 1319 dsl_dir_zapify(dd, tx); 1320 uint64_t obj = dsl_deadlist_alloc(mos, tx); 1321 VERIFY0(zap_add(mos, dd->dd_object, DD_FIELD_LIVELIST, 1322 sizeof (uint64_t), 1, &obj, tx)); 1323 spa_feature_incr(dp->dp_spa, SPA_FEATURE_LIVELIST, tx); 1324 } 1325 1326 /* 1327 * Since we're creating a new node we know it's a leaf, so we can 1328 * initialize the counts if the limit feature is active. 1329 */ 1330 if (spa_feature_is_active(dp->dp_spa, SPA_FEATURE_FS_SS_LIMIT)) { 1331 uint64_t cnt = 0; 1332 objset_t *os = dd->dd_pool->dp_meta_objset; 1333 1334 dsl_dir_zapify(dd, tx); 1335 VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_FILESYSTEM_COUNT, 1336 sizeof (cnt), 1, &cnt, tx)); 1337 VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_SNAPSHOT_COUNT, 1338 sizeof (cnt), 1, &cnt, tx)); 1339 } 1340 1341 dsl_dir_rele(dd, FTAG); 1342 1343 /* 1344 * If we are creating a clone, make sure we zero out any stale 1345 * data from the origin snapshots zil header. 1346 */ 1347 if (origin != NULL && !(flags & DS_CREATE_FLAG_NODIRTY)) { 1348 dsl_dataset_t *ds; 1349 1350 VERIFY0(dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds)); 1351 dsl_dataset_zero_zil(ds, tx); 1352 dsl_dataset_rele(ds, FTAG); 1353 } 1354 1355 return (dsobj); 1356 } 1357 1358 /* 1359 * The unique space in the head dataset can be calculated by subtracting 1360 * the space used in the most recent snapshot, that is still being used 1361 * in this file system, from the space currently in use. To figure out 1362 * the space in the most recent snapshot still in use, we need to take 1363 * the total space used in the snapshot and subtract out the space that 1364 * has been freed up since the snapshot was taken. 1365 */ 1366 void 1367 dsl_dataset_recalc_head_uniq(dsl_dataset_t *ds) 1368 { 1369 uint64_t mrs_used; 1370 uint64_t dlused, dlcomp, dluncomp; 1371 1372 ASSERT(!ds->ds_is_snapshot); 1373 1374 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) 1375 mrs_used = dsl_dataset_phys(ds->ds_prev)->ds_referenced_bytes; 1376 else 1377 mrs_used = 0; 1378 1379 dsl_deadlist_space(&ds->ds_deadlist, &dlused, &dlcomp, &dluncomp); 1380 1381 ASSERT3U(dlused, <=, mrs_used); 1382 dsl_dataset_phys(ds)->ds_unique_bytes = 1383 dsl_dataset_phys(ds)->ds_referenced_bytes - (mrs_used - dlused); 1384 1385 if (spa_version(ds->ds_dir->dd_pool->dp_spa) >= 1386 SPA_VERSION_UNIQUE_ACCURATE) 1387 dsl_dataset_phys(ds)->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 1388 } 1389 1390 void 1391 dsl_dataset_remove_from_next_clones(dsl_dataset_t *ds, uint64_t obj, 1392 dmu_tx_t *tx) 1393 { 1394 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 1395 uint64_t count __maybe_unused; 1396 int err; 1397 1398 ASSERT(dsl_dataset_phys(ds)->ds_num_children >= 2); 1399 err = zap_remove_int(mos, dsl_dataset_phys(ds)->ds_next_clones_obj, 1400 obj, tx); 1401 /* 1402 * The err should not be ENOENT, but a bug in a previous version 1403 * of the code could cause upgrade_clones_cb() to not set 1404 * ds_next_snap_obj when it should, leading to a missing entry. 1405 * If we knew that the pool was created after 1406 * SPA_VERSION_NEXT_CLONES, we could assert that it isn't 1407 * ENOENT. However, at least we can check that we don't have 1408 * too many entries in the next_clones_obj even after failing to 1409 * remove this one. 1410 */ 1411 if (err != ENOENT) 1412 VERIFY0(err); 1413 ASSERT0(zap_count(mos, dsl_dataset_phys(ds)->ds_next_clones_obj, 1414 &count)); 1415 ASSERT3U(count, <=, dsl_dataset_phys(ds)->ds_num_children - 2); 1416 } 1417 1418 1419 blkptr_t * 1420 dsl_dataset_get_blkptr(dsl_dataset_t *ds) 1421 { 1422 return (&dsl_dataset_phys(ds)->ds_bp); 1423 } 1424 1425 spa_t * 1426 dsl_dataset_get_spa(dsl_dataset_t *ds) 1427 { 1428 return (ds->ds_dir->dd_pool->dp_spa); 1429 } 1430 1431 void 1432 dsl_dataset_dirty(dsl_dataset_t *ds, dmu_tx_t *tx) 1433 { 1434 dsl_pool_t *dp; 1435 1436 if (ds == NULL) /* this is the meta-objset */ 1437 return; 1438 1439 ASSERT(ds->ds_objset != NULL); 1440 1441 if (dsl_dataset_phys(ds)->ds_next_snap_obj != 0) 1442 panic("dirtying snapshot!"); 1443 1444 /* Must not dirty a dataset in the same txg where it got snapshotted. */ 1445 ASSERT3U(tx->tx_txg, >, dsl_dataset_phys(ds)->ds_prev_snap_txg); 1446 1447 dp = ds->ds_dir->dd_pool; 1448 if (txg_list_add(&dp->dp_dirty_datasets, ds, tx->tx_txg)) { 1449 objset_t *os = ds->ds_objset; 1450 1451 /* up the hold count until we can be written out */ 1452 dmu_buf_add_ref(ds->ds_dbuf, ds); 1453 1454 /* if this dataset is encrypted, grab a reference to the DCK */ 1455 if (ds->ds_dir->dd_crypto_obj != 0 && 1456 !os->os_raw_receive && 1457 !os->os_next_write_raw[tx->tx_txg & TXG_MASK]) { 1458 ASSERT3P(ds->ds_key_mapping, !=, NULL); 1459 key_mapping_add_ref(ds->ds_key_mapping, ds); 1460 } 1461 } 1462 } 1463 1464 static int 1465 dsl_dataset_snapshot_reserve_space(dsl_dataset_t *ds, dmu_tx_t *tx) 1466 { 1467 uint64_t asize; 1468 1469 if (!dmu_tx_is_syncing(tx)) 1470 return (0); 1471 1472 /* 1473 * If there's an fs-only reservation, any blocks that might become 1474 * owned by the snapshot dataset must be accommodated by space 1475 * outside of the reservation. 1476 */ 1477 ASSERT(ds->ds_reserved == 0 || DS_UNIQUE_IS_ACCURATE(ds)); 1478 asize = MIN(dsl_dataset_phys(ds)->ds_unique_bytes, ds->ds_reserved); 1479 if (asize > dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE)) 1480 return (SET_ERROR(ENOSPC)); 1481 1482 /* 1483 * Propagate any reserved space for this snapshot to other 1484 * snapshot checks in this sync group. 1485 */ 1486 if (asize > 0) 1487 dsl_dir_willuse_space(ds->ds_dir, asize, tx); 1488 1489 return (0); 1490 } 1491 1492 int 1493 dsl_dataset_snapshot_check_impl(dsl_dataset_t *ds, const char *snapname, 1494 dmu_tx_t *tx, boolean_t recv, uint64_t cnt, cred_t *cr, proc_t *proc) 1495 { 1496 int error; 1497 uint64_t value; 1498 1499 ds->ds_trysnap_txg = tx->tx_txg; 1500 1501 if (!dmu_tx_is_syncing(tx)) 1502 return (0); 1503 1504 /* 1505 * We don't allow multiple snapshots of the same txg. If there 1506 * is already one, try again. 1507 */ 1508 if (dsl_dataset_phys(ds)->ds_prev_snap_txg >= tx->tx_txg) 1509 return (SET_ERROR(EAGAIN)); 1510 1511 /* 1512 * Check for conflicting snapshot name. 1513 */ 1514 error = dsl_dataset_snap_lookup(ds, snapname, &value); 1515 if (error == 0) 1516 return (SET_ERROR(EEXIST)); 1517 if (error != ENOENT) 1518 return (error); 1519 1520 /* 1521 * We don't allow taking snapshots of inconsistent datasets, such as 1522 * those into which we are currently receiving. However, if we are 1523 * creating this snapshot as part of a receive, this check will be 1524 * executed atomically with respect to the completion of the receive 1525 * itself but prior to the clearing of DS_FLAG_INCONSISTENT; in this 1526 * case we ignore this, knowing it will be fixed up for us shortly in 1527 * dmu_recv_end_sync(). 1528 */ 1529 if (!recv && DS_IS_INCONSISTENT(ds)) 1530 return (SET_ERROR(EBUSY)); 1531 1532 /* 1533 * Skip the check for temporary snapshots or if we have already checked 1534 * the counts in dsl_dataset_snapshot_check. This means we really only 1535 * check the count here when we're receiving a stream. 1536 */ 1537 if (cnt != 0 && cr != NULL) { 1538 error = dsl_fs_ss_limit_check(ds->ds_dir, cnt, 1539 ZFS_PROP_SNAPSHOT_LIMIT, NULL, cr, proc); 1540 if (error != 0) 1541 return (error); 1542 } 1543 1544 error = dsl_dataset_snapshot_reserve_space(ds, tx); 1545 if (error != 0) 1546 return (error); 1547 1548 return (0); 1549 } 1550 1551 int 1552 dsl_dataset_snapshot_check(void *arg, dmu_tx_t *tx) 1553 { 1554 dsl_dataset_snapshot_arg_t *ddsa = arg; 1555 dsl_pool_t *dp = dmu_tx_pool(tx); 1556 nvpair_t *pair; 1557 int rv = 0; 1558 1559 /* 1560 * Pre-compute how many total new snapshots will be created for each 1561 * level in the tree and below. This is needed for validating the 1562 * snapshot limit when either taking a recursive snapshot or when 1563 * taking multiple snapshots. 1564 * 1565 * The problem is that the counts are not actually adjusted when 1566 * we are checking, only when we finally sync. For a single snapshot, 1567 * this is easy, the count will increase by 1 at each node up the tree, 1568 * but its more complicated for the recursive/multiple snapshot case. 1569 * 1570 * The dsl_fs_ss_limit_check function does recursively check the count 1571 * at each level up the tree but since it is validating each snapshot 1572 * independently we need to be sure that we are validating the complete 1573 * count for the entire set of snapshots. We do this by rolling up the 1574 * counts for each component of the name into an nvlist and then 1575 * checking each of those cases with the aggregated count. 1576 * 1577 * This approach properly handles not only the recursive snapshot 1578 * case (where we get all of those on the ddsa_snaps list) but also 1579 * the sibling case (e.g. snapshot a/b and a/c so that we will also 1580 * validate the limit on 'a' using a count of 2). 1581 * 1582 * We validate the snapshot names in the third loop and only report 1583 * name errors once. 1584 */ 1585 if (dmu_tx_is_syncing(tx)) { 1586 char *nm; 1587 nvlist_t *cnt_track = NULL; 1588 cnt_track = fnvlist_alloc(); 1589 1590 nm = kmem_alloc(MAXPATHLEN, KM_SLEEP); 1591 1592 /* Rollup aggregated counts into the cnt_track list */ 1593 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL); 1594 pair != NULL; 1595 pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) { 1596 char *pdelim; 1597 uint64_t val; 1598 1599 (void) strlcpy(nm, nvpair_name(pair), MAXPATHLEN); 1600 pdelim = strchr(nm, '@'); 1601 if (pdelim == NULL) 1602 continue; 1603 *pdelim = '\0'; 1604 1605 do { 1606 if (nvlist_lookup_uint64(cnt_track, nm, 1607 &val) == 0) { 1608 /* update existing entry */ 1609 fnvlist_add_uint64(cnt_track, nm, 1610 val + 1); 1611 } else { 1612 /* add to list */ 1613 fnvlist_add_uint64(cnt_track, nm, 1); 1614 } 1615 1616 pdelim = strrchr(nm, '/'); 1617 if (pdelim != NULL) 1618 *pdelim = '\0'; 1619 } while (pdelim != NULL); 1620 } 1621 1622 kmem_free(nm, MAXPATHLEN); 1623 1624 /* Check aggregated counts at each level */ 1625 for (pair = nvlist_next_nvpair(cnt_track, NULL); 1626 pair != NULL; pair = nvlist_next_nvpair(cnt_track, pair)) { 1627 int error = 0; 1628 char *name; 1629 uint64_t cnt = 0; 1630 dsl_dataset_t *ds; 1631 1632 name = nvpair_name(pair); 1633 cnt = fnvpair_value_uint64(pair); 1634 ASSERT(cnt > 0); 1635 1636 error = dsl_dataset_hold(dp, name, FTAG, &ds); 1637 if (error == 0) { 1638 error = dsl_fs_ss_limit_check(ds->ds_dir, cnt, 1639 ZFS_PROP_SNAPSHOT_LIMIT, NULL, 1640 ddsa->ddsa_cr, ddsa->ddsa_proc); 1641 dsl_dataset_rele(ds, FTAG); 1642 } 1643 1644 if (error != 0) { 1645 if (ddsa->ddsa_errors != NULL) 1646 fnvlist_add_int32(ddsa->ddsa_errors, 1647 name, error); 1648 rv = error; 1649 /* only report one error for this check */ 1650 break; 1651 } 1652 } 1653 nvlist_free(cnt_track); 1654 } 1655 1656 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL); 1657 pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) { 1658 int error = 0; 1659 dsl_dataset_t *ds; 1660 char *name, *atp = NULL; 1661 char dsname[ZFS_MAX_DATASET_NAME_LEN]; 1662 1663 name = nvpair_name(pair); 1664 if (strlen(name) >= ZFS_MAX_DATASET_NAME_LEN) 1665 error = SET_ERROR(ENAMETOOLONG); 1666 if (error == 0) { 1667 atp = strchr(name, '@'); 1668 if (atp == NULL) 1669 error = SET_ERROR(EINVAL); 1670 if (error == 0) 1671 (void) strlcpy(dsname, name, atp - name + 1); 1672 } 1673 if (error == 0) 1674 error = dsl_dataset_hold(dp, dsname, FTAG, &ds); 1675 if (error == 0) { 1676 /* passing 0/NULL skips dsl_fs_ss_limit_check */ 1677 error = dsl_dataset_snapshot_check_impl(ds, 1678 atp + 1, tx, B_FALSE, 0, NULL, NULL); 1679 dsl_dataset_rele(ds, FTAG); 1680 } 1681 1682 if (error != 0) { 1683 if (ddsa->ddsa_errors != NULL) { 1684 fnvlist_add_int32(ddsa->ddsa_errors, 1685 name, error); 1686 } 1687 rv = error; 1688 } 1689 } 1690 1691 return (rv); 1692 } 1693 1694 void 1695 dsl_dataset_snapshot_sync_impl(dsl_dataset_t *ds, const char *snapname, 1696 dmu_tx_t *tx) 1697 { 1698 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1699 dmu_buf_t *dbuf; 1700 dsl_dataset_phys_t *dsphys; 1701 uint64_t dsobj, crtxg; 1702 objset_t *mos = dp->dp_meta_objset; 1703 static zil_header_t zero_zil __maybe_unused; 1704 objset_t *os __maybe_unused; 1705 1706 ASSERT(RRW_WRITE_HELD(&dp->dp_config_rwlock)); 1707 1708 /* 1709 * If we are on an old pool, the zil must not be active, in which 1710 * case it will be zeroed. Usually zil_suspend() accomplishes this. 1711 */ 1712 ASSERT(spa_version(dmu_tx_pool(tx)->dp_spa) >= SPA_VERSION_FAST_SNAP || 1713 dmu_objset_from_ds(ds, &os) != 0 || 1714 memcmp(&os->os_phys->os_zil_header, &zero_zil, 1715 sizeof (zero_zil)) == 0); 1716 1717 /* Should not snapshot a dirty dataset. */ 1718 ASSERT(!txg_list_member(&ds->ds_dir->dd_pool->dp_dirty_datasets, 1719 ds, tx->tx_txg)); 1720 1721 dsl_fs_ss_count_adjust(ds->ds_dir, 1, DD_FIELD_SNAPSHOT_COUNT, tx); 1722 1723 /* 1724 * The origin's ds_creation_txg has to be < TXG_INITIAL 1725 */ 1726 if (strcmp(snapname, ORIGIN_DIR_NAME) == 0) 1727 crtxg = 1; 1728 else 1729 crtxg = tx->tx_txg; 1730 1731 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, 1732 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); 1733 VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); 1734 dmu_buf_will_dirty(dbuf, tx); 1735 dsphys = dbuf->db_data; 1736 memset(dsphys, 0, sizeof (dsl_dataset_phys_t)); 1737 dsphys->ds_dir_obj = ds->ds_dir->dd_object; 1738 dsphys->ds_fsid_guid = unique_create(); 1739 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, 1740 sizeof (dsphys->ds_guid)); 1741 dsphys->ds_prev_snap_obj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 1742 dsphys->ds_prev_snap_txg = dsl_dataset_phys(ds)->ds_prev_snap_txg; 1743 dsphys->ds_next_snap_obj = ds->ds_object; 1744 dsphys->ds_num_children = 1; 1745 dsphys->ds_creation_time = gethrestime_sec(); 1746 dsphys->ds_creation_txg = crtxg; 1747 dsphys->ds_deadlist_obj = dsl_dataset_phys(ds)->ds_deadlist_obj; 1748 dsphys->ds_referenced_bytes = dsl_dataset_phys(ds)->ds_referenced_bytes; 1749 dsphys->ds_compressed_bytes = dsl_dataset_phys(ds)->ds_compressed_bytes; 1750 dsphys->ds_uncompressed_bytes = 1751 dsl_dataset_phys(ds)->ds_uncompressed_bytes; 1752 dsphys->ds_flags = dsl_dataset_phys(ds)->ds_flags; 1753 rrw_enter(&ds->ds_bp_rwlock, RW_READER, FTAG); 1754 dsphys->ds_bp = dsl_dataset_phys(ds)->ds_bp; 1755 rrw_exit(&ds->ds_bp_rwlock, FTAG); 1756 dmu_buf_rele(dbuf, FTAG); 1757 1758 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 1759 if (zfeature_active(f, ds->ds_feature[f])) { 1760 dsl_dataset_activate_feature(dsobj, f, 1761 ds->ds_feature[f], tx); 1762 } 1763 } 1764 1765 ASSERT3U(ds->ds_prev != 0, ==, 1766 dsl_dataset_phys(ds)->ds_prev_snap_obj != 0); 1767 if (ds->ds_prev) { 1768 uint64_t next_clones_obj = 1769 dsl_dataset_phys(ds->ds_prev)->ds_next_clones_obj; 1770 ASSERT(dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj == 1771 ds->ds_object || 1772 dsl_dataset_phys(ds->ds_prev)->ds_num_children > 1); 1773 if (dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj == 1774 ds->ds_object) { 1775 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); 1776 ASSERT3U(dsl_dataset_phys(ds)->ds_prev_snap_txg, ==, 1777 dsl_dataset_phys(ds->ds_prev)->ds_creation_txg); 1778 dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj = dsobj; 1779 } else if (next_clones_obj != 0) { 1780 dsl_dataset_remove_from_next_clones(ds->ds_prev, 1781 dsphys->ds_next_snap_obj, tx); 1782 VERIFY0(zap_add_int(mos, 1783 next_clones_obj, dsobj, tx)); 1784 } 1785 } 1786 1787 /* 1788 * If we have a reference-reservation on this dataset, we will 1789 * need to increase the amount of refreservation being charged 1790 * since our unique space is going to zero. 1791 */ 1792 if (ds->ds_reserved) { 1793 int64_t delta; 1794 ASSERT(DS_UNIQUE_IS_ACCURATE(ds)); 1795 delta = MIN(dsl_dataset_phys(ds)->ds_unique_bytes, 1796 ds->ds_reserved); 1797 dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV, 1798 delta, 0, 0, tx); 1799 } 1800 1801 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1802 dsl_dataset_phys(ds)->ds_deadlist_obj = 1803 dsl_deadlist_clone(&ds->ds_deadlist, UINT64_MAX, 1804 dsl_dataset_phys(ds)->ds_prev_snap_obj, tx); 1805 dsl_deadlist_close(&ds->ds_deadlist); 1806 dsl_deadlist_open(&ds->ds_deadlist, mos, 1807 dsl_dataset_phys(ds)->ds_deadlist_obj); 1808 dsl_deadlist_add_key(&ds->ds_deadlist, 1809 dsl_dataset_phys(ds)->ds_prev_snap_txg, tx); 1810 dsl_bookmark_snapshotted(ds, tx); 1811 1812 if (dsl_dataset_remap_deadlist_exists(ds)) { 1813 uint64_t remap_deadlist_obj = 1814 dsl_dataset_get_remap_deadlist_object(ds); 1815 /* 1816 * Move the remap_deadlist to the snapshot. The head 1817 * will create a new remap deadlist on demand, from 1818 * dsl_dataset_block_remapped(). 1819 */ 1820 dsl_dataset_unset_remap_deadlist_object(ds, tx); 1821 dsl_deadlist_close(&ds->ds_remap_deadlist); 1822 1823 dmu_object_zapify(mos, dsobj, DMU_OT_DSL_DATASET, tx); 1824 VERIFY0(zap_add(mos, dsobj, DS_FIELD_REMAP_DEADLIST, 1825 sizeof (remap_deadlist_obj), 1, &remap_deadlist_obj, tx)); 1826 } 1827 1828 /* 1829 * Create a ivset guid for this snapshot if the dataset is 1830 * encrypted. This may be overridden by a raw receive. A 1831 * previous implementation of this code did not have this 1832 * field as part of the on-disk format for ZFS encryption 1833 * (see errata #4). As part of the remediation for this 1834 * issue, we ask the user to enable the bookmark_v2 feature 1835 * which is now a dependency of the encryption feature. We 1836 * use this as a heuristic to determine when the user has 1837 * elected to correct any datasets created with the old code. 1838 * As a result, we only do this step if the bookmark_v2 1839 * feature is enabled, which limits the number of states a 1840 * given pool / dataset can be in with regards to terms of 1841 * correcting the issue. 1842 */ 1843 if (ds->ds_dir->dd_crypto_obj != 0 && 1844 spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_BOOKMARK_V2)) { 1845 uint64_t ivset_guid = unique_create(); 1846 1847 dmu_object_zapify(mos, dsobj, DMU_OT_DSL_DATASET, tx); 1848 VERIFY0(zap_add(mos, dsobj, DS_FIELD_IVSET_GUID, 1849 sizeof (ivset_guid), 1, &ivset_guid, tx)); 1850 } 1851 1852 ASSERT3U(dsl_dataset_phys(ds)->ds_prev_snap_txg, <, tx->tx_txg); 1853 dsl_dataset_phys(ds)->ds_prev_snap_obj = dsobj; 1854 dsl_dataset_phys(ds)->ds_prev_snap_txg = crtxg; 1855 dsl_dataset_phys(ds)->ds_unique_bytes = 0; 1856 1857 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE) 1858 dsl_dataset_phys(ds)->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 1859 1860 VERIFY0(zap_add(mos, dsl_dataset_phys(ds)->ds_snapnames_zapobj, 1861 snapname, 8, 1, &dsobj, tx)); 1862 1863 if (ds->ds_prev) 1864 dsl_dataset_rele(ds->ds_prev, ds); 1865 VERIFY0(dsl_dataset_hold_obj(dp, 1866 dsl_dataset_phys(ds)->ds_prev_snap_obj, ds, &ds->ds_prev)); 1867 1868 dsl_scan_ds_snapshotted(ds, tx); 1869 1870 dsl_dir_snap_cmtime_update(ds->ds_dir, tx); 1871 1872 if (zfs_snapshot_history_enabled) 1873 spa_history_log_internal_ds(ds->ds_prev, "snapshot", tx, " "); 1874 } 1875 1876 void 1877 dsl_dataset_snapshot_sync(void *arg, dmu_tx_t *tx) 1878 { 1879 dsl_dataset_snapshot_arg_t *ddsa = arg; 1880 dsl_pool_t *dp = dmu_tx_pool(tx); 1881 nvpair_t *pair; 1882 1883 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL); 1884 pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) { 1885 dsl_dataset_t *ds; 1886 char *name, *atp; 1887 char dsname[ZFS_MAX_DATASET_NAME_LEN]; 1888 1889 name = nvpair_name(pair); 1890 atp = strchr(name, '@'); 1891 (void) strlcpy(dsname, name, atp - name + 1); 1892 VERIFY0(dsl_dataset_hold(dp, dsname, FTAG, &ds)); 1893 1894 dsl_dataset_snapshot_sync_impl(ds, atp + 1, tx); 1895 if (ddsa->ddsa_props != NULL) { 1896 dsl_props_set_sync_impl(ds->ds_prev, 1897 ZPROP_SRC_LOCAL, ddsa->ddsa_props, tx); 1898 } 1899 dsl_dataset_rele(ds, FTAG); 1900 } 1901 } 1902 1903 /* 1904 * The snapshots must all be in the same pool. 1905 * All-or-nothing: if there are any failures, nothing will be modified. 1906 */ 1907 int 1908 dsl_dataset_snapshot(nvlist_t *snaps, nvlist_t *props, nvlist_t *errors) 1909 { 1910 dsl_dataset_snapshot_arg_t ddsa; 1911 nvpair_t *pair; 1912 boolean_t needsuspend; 1913 int error; 1914 spa_t *spa; 1915 char *firstname; 1916 nvlist_t *suspended = NULL; 1917 1918 pair = nvlist_next_nvpair(snaps, NULL); 1919 if (pair == NULL) 1920 return (0); 1921 firstname = nvpair_name(pair); 1922 1923 error = spa_open(firstname, &spa, FTAG); 1924 if (error != 0) 1925 return (error); 1926 needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP); 1927 spa_close(spa, FTAG); 1928 1929 if (needsuspend) { 1930 suspended = fnvlist_alloc(); 1931 for (pair = nvlist_next_nvpair(snaps, NULL); pair != NULL; 1932 pair = nvlist_next_nvpair(snaps, pair)) { 1933 char fsname[ZFS_MAX_DATASET_NAME_LEN]; 1934 char *snapname = nvpair_name(pair); 1935 char *atp; 1936 void *cookie; 1937 1938 atp = strchr(snapname, '@'); 1939 if (atp == NULL) { 1940 error = SET_ERROR(EINVAL); 1941 break; 1942 } 1943 (void) strlcpy(fsname, snapname, atp - snapname + 1); 1944 1945 error = zil_suspend(fsname, &cookie); 1946 if (error != 0) 1947 break; 1948 fnvlist_add_uint64(suspended, fsname, 1949 (uintptr_t)cookie); 1950 } 1951 } 1952 1953 ddsa.ddsa_snaps = snaps; 1954 ddsa.ddsa_props = props; 1955 ddsa.ddsa_errors = errors; 1956 ddsa.ddsa_cr = CRED(); 1957 ddsa.ddsa_proc = curproc; 1958 1959 if (error == 0) { 1960 error = dsl_sync_task(firstname, dsl_dataset_snapshot_check, 1961 dsl_dataset_snapshot_sync, &ddsa, 1962 fnvlist_num_pairs(snaps) * 3, ZFS_SPACE_CHECK_NORMAL); 1963 } 1964 1965 if (suspended != NULL) { 1966 for (pair = nvlist_next_nvpair(suspended, NULL); pair != NULL; 1967 pair = nvlist_next_nvpair(suspended, pair)) { 1968 zil_resume((void *)(uintptr_t) 1969 fnvpair_value_uint64(pair)); 1970 } 1971 fnvlist_free(suspended); 1972 } 1973 1974 if (error == 0) { 1975 for (pair = nvlist_next_nvpair(snaps, NULL); pair != NULL; 1976 pair = nvlist_next_nvpair(snaps, pair)) { 1977 zvol_create_minor(nvpair_name(pair)); 1978 } 1979 } 1980 1981 return (error); 1982 } 1983 1984 typedef struct dsl_dataset_snapshot_tmp_arg { 1985 const char *ddsta_fsname; 1986 const char *ddsta_snapname; 1987 minor_t ddsta_cleanup_minor; 1988 const char *ddsta_htag; 1989 } dsl_dataset_snapshot_tmp_arg_t; 1990 1991 static int 1992 dsl_dataset_snapshot_tmp_check(void *arg, dmu_tx_t *tx) 1993 { 1994 dsl_dataset_snapshot_tmp_arg_t *ddsta = arg; 1995 dsl_pool_t *dp = dmu_tx_pool(tx); 1996 dsl_dataset_t *ds; 1997 int error; 1998 1999 error = dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds); 2000 if (error != 0) 2001 return (error); 2002 2003 /* NULL cred means no limit check for tmp snapshot */ 2004 error = dsl_dataset_snapshot_check_impl(ds, ddsta->ddsta_snapname, 2005 tx, B_FALSE, 0, NULL, NULL); 2006 if (error != 0) { 2007 dsl_dataset_rele(ds, FTAG); 2008 return (error); 2009 } 2010 2011 if (spa_version(dp->dp_spa) < SPA_VERSION_USERREFS) { 2012 dsl_dataset_rele(ds, FTAG); 2013 return (SET_ERROR(ENOTSUP)); 2014 } 2015 error = dsl_dataset_user_hold_check_one(NULL, ddsta->ddsta_htag, 2016 B_TRUE, tx); 2017 if (error != 0) { 2018 dsl_dataset_rele(ds, FTAG); 2019 return (error); 2020 } 2021 2022 dsl_dataset_rele(ds, FTAG); 2023 return (0); 2024 } 2025 2026 static void 2027 dsl_dataset_snapshot_tmp_sync(void *arg, dmu_tx_t *tx) 2028 { 2029 dsl_dataset_snapshot_tmp_arg_t *ddsta = arg; 2030 dsl_pool_t *dp = dmu_tx_pool(tx); 2031 dsl_dataset_t *ds = NULL; 2032 2033 VERIFY0(dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds)); 2034 2035 dsl_dataset_snapshot_sync_impl(ds, ddsta->ddsta_snapname, tx); 2036 dsl_dataset_user_hold_sync_one(ds->ds_prev, ddsta->ddsta_htag, 2037 ddsta->ddsta_cleanup_minor, gethrestime_sec(), tx); 2038 dsl_destroy_snapshot_sync_impl(ds->ds_prev, B_TRUE, tx); 2039 2040 dsl_dataset_rele(ds, FTAG); 2041 } 2042 2043 int 2044 dsl_dataset_snapshot_tmp(const char *fsname, const char *snapname, 2045 minor_t cleanup_minor, const char *htag) 2046 { 2047 dsl_dataset_snapshot_tmp_arg_t ddsta; 2048 int error; 2049 spa_t *spa; 2050 boolean_t needsuspend; 2051 void *cookie; 2052 2053 ddsta.ddsta_fsname = fsname; 2054 ddsta.ddsta_snapname = snapname; 2055 ddsta.ddsta_cleanup_minor = cleanup_minor; 2056 ddsta.ddsta_htag = htag; 2057 2058 error = spa_open(fsname, &spa, FTAG); 2059 if (error != 0) 2060 return (error); 2061 needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP); 2062 spa_close(spa, FTAG); 2063 2064 if (needsuspend) { 2065 error = zil_suspend(fsname, &cookie); 2066 if (error != 0) 2067 return (error); 2068 } 2069 2070 error = dsl_sync_task(fsname, dsl_dataset_snapshot_tmp_check, 2071 dsl_dataset_snapshot_tmp_sync, &ddsta, 3, ZFS_SPACE_CHECK_RESERVED); 2072 2073 if (needsuspend) 2074 zil_resume(cookie); 2075 return (error); 2076 } 2077 2078 void 2079 dsl_dataset_sync(dsl_dataset_t *ds, zio_t *zio, dmu_tx_t *tx) 2080 { 2081 ASSERT(dmu_tx_is_syncing(tx)); 2082 ASSERT(ds->ds_objset != NULL); 2083 ASSERT(dsl_dataset_phys(ds)->ds_next_snap_obj == 0); 2084 2085 /* 2086 * in case we had to change ds_fsid_guid when we opened it, 2087 * sync it out now. 2088 */ 2089 dmu_buf_will_dirty(ds->ds_dbuf, tx); 2090 dsl_dataset_phys(ds)->ds_fsid_guid = ds->ds_fsid_guid; 2091 2092 if (ds->ds_resume_bytes[tx->tx_txg & TXG_MASK] != 0) { 2093 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset, 2094 ds->ds_object, DS_FIELD_RESUME_OBJECT, 8, 1, 2095 &ds->ds_resume_object[tx->tx_txg & TXG_MASK], tx)); 2096 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset, 2097 ds->ds_object, DS_FIELD_RESUME_OFFSET, 8, 1, 2098 &ds->ds_resume_offset[tx->tx_txg & TXG_MASK], tx)); 2099 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset, 2100 ds->ds_object, DS_FIELD_RESUME_BYTES, 8, 1, 2101 &ds->ds_resume_bytes[tx->tx_txg & TXG_MASK], tx)); 2102 ds->ds_resume_object[tx->tx_txg & TXG_MASK] = 0; 2103 ds->ds_resume_offset[tx->tx_txg & TXG_MASK] = 0; 2104 ds->ds_resume_bytes[tx->tx_txg & TXG_MASK] = 0; 2105 } 2106 2107 dmu_objset_sync(ds->ds_objset, zio, tx); 2108 2109 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 2110 if (zfeature_active(f, ds->ds_feature_activation[f])) { 2111 if (zfeature_active(f, ds->ds_feature[f])) 2112 continue; 2113 dsl_dataset_activate_feature(ds->ds_object, f, 2114 ds->ds_feature_activation[f], tx); 2115 ds->ds_feature[f] = ds->ds_feature_activation[f]; 2116 } 2117 } 2118 } 2119 2120 /* 2121 * Check if the percentage of blocks shared between the clone and the 2122 * snapshot (as opposed to those that are clone only) is below a certain 2123 * threshold 2124 */ 2125 static boolean_t 2126 dsl_livelist_should_disable(dsl_dataset_t *ds) 2127 { 2128 uint64_t used, referenced; 2129 int percent_shared; 2130 2131 used = dsl_dir_get_usedds(ds->ds_dir); 2132 referenced = dsl_get_referenced(ds); 2133 ASSERT3U(referenced, >=, 0); 2134 ASSERT3U(used, >=, 0); 2135 if (referenced == 0) 2136 return (B_FALSE); 2137 percent_shared = (100 * (referenced - used)) / referenced; 2138 if (percent_shared <= zfs_livelist_min_percent_shared) 2139 return (B_TRUE); 2140 return (B_FALSE); 2141 } 2142 2143 /* 2144 * Check if it is possible to combine two livelist entries into one. 2145 * This is the case if the combined number of 'live' blkptrs (ALLOCs that 2146 * don't have a matching FREE) is under the maximum sublist size. 2147 * We check this by subtracting twice the total number of frees from the total 2148 * number of blkptrs. FREEs are counted twice because each FREE blkptr 2149 * will cancel out an ALLOC blkptr when the livelist is processed. 2150 */ 2151 static boolean_t 2152 dsl_livelist_should_condense(dsl_deadlist_entry_t *first, 2153 dsl_deadlist_entry_t *next) 2154 { 2155 uint64_t total_free = first->dle_bpobj.bpo_phys->bpo_num_freed + 2156 next->dle_bpobj.bpo_phys->bpo_num_freed; 2157 uint64_t total_entries = first->dle_bpobj.bpo_phys->bpo_num_blkptrs + 2158 next->dle_bpobj.bpo_phys->bpo_num_blkptrs; 2159 if ((total_entries - (2 * total_free)) < zfs_livelist_max_entries) 2160 return (B_TRUE); 2161 return (B_FALSE); 2162 } 2163 2164 typedef struct try_condense_arg { 2165 spa_t *spa; 2166 dsl_dataset_t *ds; 2167 } try_condense_arg_t; 2168 2169 /* 2170 * Iterate over the livelist entries, searching for a pair to condense. 2171 * A nonzero return value means stop, 0 means keep looking. 2172 */ 2173 static int 2174 dsl_livelist_try_condense(void *arg, dsl_deadlist_entry_t *first) 2175 { 2176 try_condense_arg_t *tca = arg; 2177 spa_t *spa = tca->spa; 2178 dsl_dataset_t *ds = tca->ds; 2179 dsl_deadlist_t *ll = &ds->ds_dir->dd_livelist; 2180 dsl_deadlist_entry_t *next; 2181 2182 /* The condense thread has not yet been created at import */ 2183 if (spa->spa_livelist_condense_zthr == NULL) 2184 return (1); 2185 2186 /* A condense is already in progress */ 2187 if (spa->spa_to_condense.ds != NULL) 2188 return (1); 2189 2190 next = AVL_NEXT(&ll->dl_tree, &first->dle_node); 2191 /* The livelist has only one entry - don't condense it */ 2192 if (next == NULL) 2193 return (1); 2194 2195 /* Next is the newest entry - don't condense it */ 2196 if (AVL_NEXT(&ll->dl_tree, &next->dle_node) == NULL) 2197 return (1); 2198 2199 /* This pair is not ready to condense but keep looking */ 2200 if (!dsl_livelist_should_condense(first, next)) 2201 return (0); 2202 2203 /* 2204 * Add a ref to prevent the dataset from being evicted while 2205 * the condense zthr or synctask are running. Ref will be 2206 * released at the end of the condense synctask 2207 */ 2208 dmu_buf_add_ref(ds->ds_dbuf, spa); 2209 2210 spa->spa_to_condense.ds = ds; 2211 spa->spa_to_condense.first = first; 2212 spa->spa_to_condense.next = next; 2213 spa->spa_to_condense.syncing = B_FALSE; 2214 spa->spa_to_condense.cancelled = B_FALSE; 2215 2216 zthr_wakeup(spa->spa_livelist_condense_zthr); 2217 return (1); 2218 } 2219 2220 static void 2221 dsl_flush_pending_livelist(dsl_dataset_t *ds, dmu_tx_t *tx) 2222 { 2223 dsl_dir_t *dd = ds->ds_dir; 2224 spa_t *spa = ds->ds_dir->dd_pool->dp_spa; 2225 dsl_deadlist_entry_t *last = dsl_deadlist_last(&dd->dd_livelist); 2226 2227 /* Check if we need to add a new sub-livelist */ 2228 if (last == NULL) { 2229 /* The livelist is empty */ 2230 dsl_deadlist_add_key(&dd->dd_livelist, 2231 tx->tx_txg - 1, tx); 2232 } else if (spa_sync_pass(spa) == 1) { 2233 /* 2234 * Check if the newest entry is full. If it is, make a new one. 2235 * We only do this once per sync because we could overfill a 2236 * sublist in one sync pass and don't want to add another entry 2237 * for a txg that is already represented. This ensures that 2238 * blkptrs born in the same txg are stored in the same sublist. 2239 */ 2240 bpobj_t bpobj = last->dle_bpobj; 2241 uint64_t all = bpobj.bpo_phys->bpo_num_blkptrs; 2242 uint64_t free = bpobj.bpo_phys->bpo_num_freed; 2243 uint64_t alloc = all - free; 2244 if (alloc > zfs_livelist_max_entries) { 2245 dsl_deadlist_add_key(&dd->dd_livelist, 2246 tx->tx_txg - 1, tx); 2247 } 2248 } 2249 2250 /* Insert each entry into the on-disk livelist */ 2251 bplist_iterate(&dd->dd_pending_allocs, 2252 dsl_deadlist_insert_alloc_cb, &dd->dd_livelist, tx); 2253 bplist_iterate(&dd->dd_pending_frees, 2254 dsl_deadlist_insert_free_cb, &dd->dd_livelist, tx); 2255 2256 /* Attempt to condense every pair of adjacent entries */ 2257 try_condense_arg_t arg = { 2258 .spa = spa, 2259 .ds = ds 2260 }; 2261 dsl_deadlist_iterate(&dd->dd_livelist, dsl_livelist_try_condense, 2262 &arg); 2263 } 2264 2265 void 2266 dsl_dataset_sync_done(dsl_dataset_t *ds, dmu_tx_t *tx) 2267 { 2268 objset_t *os = ds->ds_objset; 2269 2270 bplist_iterate(&ds->ds_pending_deadlist, 2271 dsl_deadlist_insert_alloc_cb, &ds->ds_deadlist, tx); 2272 2273 if (dsl_deadlist_is_open(&ds->ds_dir->dd_livelist)) { 2274 dsl_flush_pending_livelist(ds, tx); 2275 if (dsl_livelist_should_disable(ds)) { 2276 dsl_dir_remove_livelist(ds->ds_dir, tx, B_TRUE); 2277 } 2278 } 2279 2280 dsl_bookmark_sync_done(ds, tx); 2281 2282 multilist_destroy(&os->os_synced_dnodes); 2283 2284 if (os->os_encrypted) 2285 os->os_next_write_raw[tx->tx_txg & TXG_MASK] = B_FALSE; 2286 else 2287 ASSERT0(os->os_next_write_raw[tx->tx_txg & TXG_MASK]); 2288 2289 ASSERT(!dmu_objset_is_dirty(os, dmu_tx_get_txg(tx))); 2290 2291 dmu_buf_rele(ds->ds_dbuf, ds); 2292 } 2293 2294 int 2295 get_clones_stat_impl(dsl_dataset_t *ds, nvlist_t *val) 2296 { 2297 uint64_t count = 0; 2298 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 2299 zap_cursor_t zc; 2300 zap_attribute_t za; 2301 2302 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool)); 2303 2304 /* 2305 * There may be missing entries in ds_next_clones_obj 2306 * due to a bug in a previous version of the code. 2307 * Only trust it if it has the right number of entries. 2308 */ 2309 if (dsl_dataset_phys(ds)->ds_next_clones_obj != 0) { 2310 VERIFY0(zap_count(mos, dsl_dataset_phys(ds)->ds_next_clones_obj, 2311 &count)); 2312 } 2313 if (count != dsl_dataset_phys(ds)->ds_num_children - 1) { 2314 return (SET_ERROR(ENOENT)); 2315 } 2316 for (zap_cursor_init(&zc, mos, 2317 dsl_dataset_phys(ds)->ds_next_clones_obj); 2318 zap_cursor_retrieve(&zc, &za) == 0; 2319 zap_cursor_advance(&zc)) { 2320 dsl_dataset_t *clone; 2321 char buf[ZFS_MAX_DATASET_NAME_LEN]; 2322 VERIFY0(dsl_dataset_hold_obj(ds->ds_dir->dd_pool, 2323 za.za_first_integer, FTAG, &clone)); 2324 dsl_dir_name(clone->ds_dir, buf); 2325 fnvlist_add_boolean(val, buf); 2326 dsl_dataset_rele(clone, FTAG); 2327 } 2328 zap_cursor_fini(&zc); 2329 return (0); 2330 } 2331 2332 void 2333 get_clones_stat(dsl_dataset_t *ds, nvlist_t *nv) 2334 { 2335 nvlist_t *propval = fnvlist_alloc(); 2336 nvlist_t *val = fnvlist_alloc(); 2337 2338 if (get_clones_stat_impl(ds, val) == 0) { 2339 fnvlist_add_nvlist(propval, ZPROP_VALUE, val); 2340 fnvlist_add_nvlist(nv, zfs_prop_to_name(ZFS_PROP_CLONES), 2341 propval); 2342 } 2343 2344 nvlist_free(val); 2345 nvlist_free(propval); 2346 } 2347 2348 static char * 2349 get_receive_resume_token_impl(dsl_dataset_t *ds) 2350 { 2351 if (!dsl_dataset_has_resume_receive_state(ds)) 2352 return (NULL); 2353 2354 dsl_pool_t *dp = ds->ds_dir->dd_pool; 2355 char *str; 2356 void *packed; 2357 uint8_t *compressed; 2358 uint64_t val; 2359 nvlist_t *token_nv = fnvlist_alloc(); 2360 size_t packed_size, compressed_size; 2361 2362 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 2363 DS_FIELD_RESUME_FROMGUID, sizeof (val), 1, &val) == 0) { 2364 fnvlist_add_uint64(token_nv, "fromguid", val); 2365 } 2366 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 2367 DS_FIELD_RESUME_OBJECT, sizeof (val), 1, &val) == 0) { 2368 fnvlist_add_uint64(token_nv, "object", val); 2369 } 2370 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 2371 DS_FIELD_RESUME_OFFSET, sizeof (val), 1, &val) == 0) { 2372 fnvlist_add_uint64(token_nv, "offset", val); 2373 } 2374 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 2375 DS_FIELD_RESUME_BYTES, sizeof (val), 1, &val) == 0) { 2376 fnvlist_add_uint64(token_nv, "bytes", val); 2377 } 2378 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 2379 DS_FIELD_RESUME_TOGUID, sizeof (val), 1, &val) == 0) { 2380 fnvlist_add_uint64(token_nv, "toguid", val); 2381 } 2382 char buf[MAXNAMELEN]; 2383 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 2384 DS_FIELD_RESUME_TONAME, 1, sizeof (buf), buf) == 0) { 2385 fnvlist_add_string(token_nv, "toname", buf); 2386 } 2387 if (zap_contains(dp->dp_meta_objset, ds->ds_object, 2388 DS_FIELD_RESUME_LARGEBLOCK) == 0) { 2389 fnvlist_add_boolean(token_nv, "largeblockok"); 2390 } 2391 if (zap_contains(dp->dp_meta_objset, ds->ds_object, 2392 DS_FIELD_RESUME_EMBEDOK) == 0) { 2393 fnvlist_add_boolean(token_nv, "embedok"); 2394 } 2395 if (zap_contains(dp->dp_meta_objset, ds->ds_object, 2396 DS_FIELD_RESUME_COMPRESSOK) == 0) { 2397 fnvlist_add_boolean(token_nv, "compressok"); 2398 } 2399 if (zap_contains(dp->dp_meta_objset, ds->ds_object, 2400 DS_FIELD_RESUME_RAWOK) == 0) { 2401 fnvlist_add_boolean(token_nv, "rawok"); 2402 } 2403 if (dsl_dataset_feature_is_active(ds, 2404 SPA_FEATURE_REDACTED_DATASETS)) { 2405 uint64_t num_redact_snaps = 0; 2406 uint64_t *redact_snaps = NULL; 2407 VERIFY3B(dsl_dataset_get_uint64_array_feature(ds, 2408 SPA_FEATURE_REDACTED_DATASETS, &num_redact_snaps, 2409 &redact_snaps), ==, B_TRUE); 2410 fnvlist_add_uint64_array(token_nv, "redact_snaps", 2411 redact_snaps, num_redact_snaps); 2412 } 2413 if (zap_contains(dp->dp_meta_objset, ds->ds_object, 2414 DS_FIELD_RESUME_REDACT_BOOKMARK_SNAPS) == 0) { 2415 uint64_t num_redact_snaps = 0, int_size = 0; 2416 uint64_t *redact_snaps = NULL; 2417 VERIFY0(zap_length(dp->dp_meta_objset, ds->ds_object, 2418 DS_FIELD_RESUME_REDACT_BOOKMARK_SNAPS, &int_size, 2419 &num_redact_snaps)); 2420 ASSERT3U(int_size, ==, sizeof (uint64_t)); 2421 2422 redact_snaps = kmem_alloc(int_size * num_redact_snaps, 2423 KM_SLEEP); 2424 VERIFY0(zap_lookup(dp->dp_meta_objset, ds->ds_object, 2425 DS_FIELD_RESUME_REDACT_BOOKMARK_SNAPS, int_size, 2426 num_redact_snaps, redact_snaps)); 2427 fnvlist_add_uint64_array(token_nv, "book_redact_snaps", 2428 redact_snaps, num_redact_snaps); 2429 kmem_free(redact_snaps, int_size * num_redact_snaps); 2430 } 2431 packed = fnvlist_pack(token_nv, &packed_size); 2432 fnvlist_free(token_nv); 2433 compressed = kmem_alloc(packed_size, KM_SLEEP); 2434 2435 compressed_size = gzip_compress(packed, compressed, 2436 packed_size, packed_size, 6); 2437 2438 zio_cksum_t cksum; 2439 fletcher_4_native_varsize(compressed, compressed_size, &cksum); 2440 2441 size_t alloc_size = compressed_size * 2 + 1; 2442 str = kmem_alloc(alloc_size, KM_SLEEP); 2443 for (int i = 0; i < compressed_size; i++) { 2444 size_t offset = i * 2; 2445 (void) snprintf(str + offset, alloc_size - offset, 2446 "%02x", compressed[i]); 2447 } 2448 str[compressed_size * 2] = '\0'; 2449 char *propval = kmem_asprintf("%u-%llx-%llx-%s", 2450 ZFS_SEND_RESUME_TOKEN_VERSION, 2451 (longlong_t)cksum.zc_word[0], 2452 (longlong_t)packed_size, str); 2453 kmem_free(packed, packed_size); 2454 kmem_free(str, alloc_size); 2455 kmem_free(compressed, packed_size); 2456 return (propval); 2457 } 2458 2459 /* 2460 * Returns a string that represents the receive resume state token. It should 2461 * be freed with strfree(). NULL is returned if no resume state is present. 2462 */ 2463 char * 2464 get_receive_resume_token(dsl_dataset_t *ds) 2465 { 2466 /* 2467 * A failed "newfs" (e.g. full) resumable receive leaves 2468 * the stats set on this dataset. Check here for the prop. 2469 */ 2470 char *token = get_receive_resume_token_impl(ds); 2471 if (token != NULL) 2472 return (token); 2473 /* 2474 * A failed incremental resumable receive leaves the 2475 * stats set on our child named "%recv". Check the child 2476 * for the prop. 2477 */ 2478 /* 6 extra bytes for /%recv */ 2479 char name[ZFS_MAX_DATASET_NAME_LEN + 6]; 2480 dsl_dataset_t *recv_ds; 2481 dsl_dataset_name(ds, name); 2482 if (strlcat(name, "/", sizeof (name)) < sizeof (name) && 2483 strlcat(name, recv_clone_name, sizeof (name)) < sizeof (name) && 2484 dsl_dataset_hold(ds->ds_dir->dd_pool, name, FTAG, &recv_ds) == 0) { 2485 token = get_receive_resume_token_impl(recv_ds); 2486 dsl_dataset_rele(recv_ds, FTAG); 2487 } 2488 return (token); 2489 } 2490 2491 uint64_t 2492 dsl_get_refratio(dsl_dataset_t *ds) 2493 { 2494 uint64_t ratio = dsl_dataset_phys(ds)->ds_compressed_bytes == 0 ? 100 : 2495 (dsl_dataset_phys(ds)->ds_uncompressed_bytes * 100 / 2496 dsl_dataset_phys(ds)->ds_compressed_bytes); 2497 return (ratio); 2498 } 2499 2500 uint64_t 2501 dsl_get_logicalreferenced(dsl_dataset_t *ds) 2502 { 2503 return (dsl_dataset_phys(ds)->ds_uncompressed_bytes); 2504 } 2505 2506 uint64_t 2507 dsl_get_compressratio(dsl_dataset_t *ds) 2508 { 2509 if (ds->ds_is_snapshot) { 2510 return (dsl_get_refratio(ds)); 2511 } else { 2512 dsl_dir_t *dd = ds->ds_dir; 2513 mutex_enter(&dd->dd_lock); 2514 uint64_t val = dsl_dir_get_compressratio(dd); 2515 mutex_exit(&dd->dd_lock); 2516 return (val); 2517 } 2518 } 2519 2520 uint64_t 2521 dsl_get_used(dsl_dataset_t *ds) 2522 { 2523 if (ds->ds_is_snapshot) { 2524 return (dsl_dataset_phys(ds)->ds_unique_bytes); 2525 } else { 2526 dsl_dir_t *dd = ds->ds_dir; 2527 mutex_enter(&dd->dd_lock); 2528 uint64_t val = dsl_dir_get_used(dd); 2529 mutex_exit(&dd->dd_lock); 2530 return (val); 2531 } 2532 } 2533 2534 uint64_t 2535 dsl_get_creation(dsl_dataset_t *ds) 2536 { 2537 return (dsl_dataset_phys(ds)->ds_creation_time); 2538 } 2539 2540 uint64_t 2541 dsl_get_creationtxg(dsl_dataset_t *ds) 2542 { 2543 return (dsl_dataset_phys(ds)->ds_creation_txg); 2544 } 2545 2546 uint64_t 2547 dsl_get_refquota(dsl_dataset_t *ds) 2548 { 2549 return (ds->ds_quota); 2550 } 2551 2552 uint64_t 2553 dsl_get_refreservation(dsl_dataset_t *ds) 2554 { 2555 return (ds->ds_reserved); 2556 } 2557 2558 uint64_t 2559 dsl_get_guid(dsl_dataset_t *ds) 2560 { 2561 return (dsl_dataset_phys(ds)->ds_guid); 2562 } 2563 2564 uint64_t 2565 dsl_get_unique(dsl_dataset_t *ds) 2566 { 2567 return (dsl_dataset_phys(ds)->ds_unique_bytes); 2568 } 2569 2570 uint64_t 2571 dsl_get_objsetid(dsl_dataset_t *ds) 2572 { 2573 return (ds->ds_object); 2574 } 2575 2576 uint64_t 2577 dsl_get_userrefs(dsl_dataset_t *ds) 2578 { 2579 return (ds->ds_userrefs); 2580 } 2581 2582 uint64_t 2583 dsl_get_defer_destroy(dsl_dataset_t *ds) 2584 { 2585 return (DS_IS_DEFER_DESTROY(ds) ? 1 : 0); 2586 } 2587 2588 uint64_t 2589 dsl_get_referenced(dsl_dataset_t *ds) 2590 { 2591 return (dsl_dataset_phys(ds)->ds_referenced_bytes); 2592 } 2593 2594 uint64_t 2595 dsl_get_numclones(dsl_dataset_t *ds) 2596 { 2597 ASSERT(ds->ds_is_snapshot); 2598 return (dsl_dataset_phys(ds)->ds_num_children - 1); 2599 } 2600 2601 uint64_t 2602 dsl_get_inconsistent(dsl_dataset_t *ds) 2603 { 2604 return ((dsl_dataset_phys(ds)->ds_flags & DS_FLAG_INCONSISTENT) ? 2605 1 : 0); 2606 } 2607 2608 uint64_t 2609 dsl_get_redacted(dsl_dataset_t *ds) 2610 { 2611 return (dsl_dataset_feature_is_active(ds, 2612 SPA_FEATURE_REDACTED_DATASETS)); 2613 } 2614 2615 uint64_t 2616 dsl_get_available(dsl_dataset_t *ds) 2617 { 2618 uint64_t refdbytes = dsl_get_referenced(ds); 2619 uint64_t availbytes = dsl_dir_space_available(ds->ds_dir, 2620 NULL, 0, TRUE); 2621 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes) { 2622 availbytes += 2623 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes; 2624 } 2625 if (ds->ds_quota != 0) { 2626 /* 2627 * Adjust available bytes according to refquota 2628 */ 2629 if (refdbytes < ds->ds_quota) { 2630 availbytes = MIN(availbytes, 2631 ds->ds_quota - refdbytes); 2632 } else { 2633 availbytes = 0; 2634 } 2635 } 2636 return (availbytes); 2637 } 2638 2639 int 2640 dsl_get_written(dsl_dataset_t *ds, uint64_t *written) 2641 { 2642 dsl_pool_t *dp = ds->ds_dir->dd_pool; 2643 dsl_dataset_t *prev; 2644 int err = dsl_dataset_hold_obj(dp, 2645 dsl_dataset_phys(ds)->ds_prev_snap_obj, FTAG, &prev); 2646 if (err == 0) { 2647 uint64_t comp, uncomp; 2648 err = dsl_dataset_space_written(prev, ds, written, 2649 &comp, &uncomp); 2650 dsl_dataset_rele(prev, FTAG); 2651 } 2652 return (err); 2653 } 2654 2655 /* 2656 * 'snap' should be a buffer of size ZFS_MAX_DATASET_NAME_LEN. 2657 */ 2658 int 2659 dsl_get_prev_snap(dsl_dataset_t *ds, char *snap) 2660 { 2661 dsl_pool_t *dp = ds->ds_dir->dd_pool; 2662 if (ds->ds_prev != NULL && ds->ds_prev != dp->dp_origin_snap) { 2663 dsl_dataset_name(ds->ds_prev, snap); 2664 return (0); 2665 } else { 2666 return (SET_ERROR(ENOENT)); 2667 } 2668 } 2669 2670 void 2671 dsl_get_redact_snaps(dsl_dataset_t *ds, nvlist_t *propval) 2672 { 2673 uint64_t nsnaps; 2674 uint64_t *snaps; 2675 if (dsl_dataset_get_uint64_array_feature(ds, 2676 SPA_FEATURE_REDACTED_DATASETS, &nsnaps, &snaps)) { 2677 fnvlist_add_uint64_array(propval, ZPROP_VALUE, snaps, 2678 nsnaps); 2679 } 2680 } 2681 2682 /* 2683 * Returns the mountpoint property and source for the given dataset in the value 2684 * and source buffers. The value buffer must be at least as large as MAXPATHLEN 2685 * and the source buffer as least as large a ZFS_MAX_DATASET_NAME_LEN. 2686 * Returns 0 on success and an error on failure. 2687 */ 2688 int 2689 dsl_get_mountpoint(dsl_dataset_t *ds, const char *dsname, char *value, 2690 char *source) 2691 { 2692 int error; 2693 dsl_pool_t *dp = ds->ds_dir->dd_pool; 2694 2695 /* Retrieve the mountpoint value stored in the zap object */ 2696 error = dsl_prop_get_ds(ds, zfs_prop_to_name(ZFS_PROP_MOUNTPOINT), 1, 2697 ZAP_MAXVALUELEN, value, source); 2698 if (error != 0) { 2699 return (error); 2700 } 2701 2702 /* 2703 * Process the dsname and source to find the full mountpoint string. 2704 * Can be skipped for 'legacy' or 'none'. 2705 */ 2706 if (value[0] == '/') { 2707 char *buf = kmem_alloc(ZAP_MAXVALUELEN, KM_SLEEP); 2708 char *root = buf; 2709 const char *relpath; 2710 2711 /* 2712 * If we inherit the mountpoint, even from a dataset 2713 * with a received value, the source will be the path of 2714 * the dataset we inherit from. If source is 2715 * ZPROP_SOURCE_VAL_RECVD, the received value is not 2716 * inherited. 2717 */ 2718 if (strcmp(source, ZPROP_SOURCE_VAL_RECVD) == 0) { 2719 relpath = ""; 2720 } else { 2721 ASSERT0(strncmp(dsname, source, strlen(source))); 2722 relpath = dsname + strlen(source); 2723 if (relpath[0] == '/') 2724 relpath++; 2725 } 2726 2727 spa_altroot(dp->dp_spa, root, ZAP_MAXVALUELEN); 2728 2729 /* 2730 * Special case an alternate root of '/'. This will 2731 * avoid having multiple leading slashes in the 2732 * mountpoint path. 2733 */ 2734 if (strcmp(root, "/") == 0) 2735 root++; 2736 2737 /* 2738 * If the mountpoint is '/' then skip over this 2739 * if we are obtaining either an alternate root or 2740 * an inherited mountpoint. 2741 */ 2742 char *mnt = value; 2743 if (value[1] == '\0' && (root[0] != '\0' || 2744 relpath[0] != '\0')) 2745 mnt = value + 1; 2746 2747 if (relpath[0] == '\0') { 2748 (void) snprintf(value, ZAP_MAXVALUELEN, "%s%s", 2749 root, mnt); 2750 } else { 2751 (void) snprintf(value, ZAP_MAXVALUELEN, "%s%s%s%s", 2752 root, mnt, relpath[0] == '@' ? "" : "/", 2753 relpath); 2754 } 2755 kmem_free(buf, ZAP_MAXVALUELEN); 2756 } 2757 2758 return (0); 2759 } 2760 2761 void 2762 dsl_dataset_stats(dsl_dataset_t *ds, nvlist_t *nv) 2763 { 2764 dsl_pool_t *dp __maybe_unused = ds->ds_dir->dd_pool; 2765 2766 ASSERT(dsl_pool_config_held(dp)); 2767 2768 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRATIO, 2769 dsl_get_refratio(ds)); 2770 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_LOGICALREFERENCED, 2771 dsl_get_logicalreferenced(ds)); 2772 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_COMPRESSRATIO, 2773 dsl_get_compressratio(ds)); 2774 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USED, 2775 dsl_get_used(ds)); 2776 2777 if (ds->ds_is_snapshot) { 2778 get_clones_stat(ds, nv); 2779 } else { 2780 char buf[ZFS_MAX_DATASET_NAME_LEN]; 2781 if (dsl_get_prev_snap(ds, buf) == 0) 2782 dsl_prop_nvlist_add_string(nv, ZFS_PROP_PREV_SNAP, 2783 buf); 2784 dsl_dir_stats(ds->ds_dir, nv); 2785 } 2786 2787 nvlist_t *propval = fnvlist_alloc(); 2788 dsl_get_redact_snaps(ds, propval); 2789 fnvlist_add_nvlist(nv, zfs_prop_to_name(ZFS_PROP_REDACT_SNAPS), 2790 propval); 2791 nvlist_free(propval); 2792 2793 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_AVAILABLE, 2794 dsl_get_available(ds)); 2795 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFERENCED, 2796 dsl_get_referenced(ds)); 2797 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATION, 2798 dsl_get_creation(ds)); 2799 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATETXG, 2800 dsl_get_creationtxg(ds)); 2801 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFQUOTA, 2802 dsl_get_refquota(ds)); 2803 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRESERVATION, 2804 dsl_get_refreservation(ds)); 2805 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_GUID, 2806 dsl_get_guid(ds)); 2807 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_UNIQUE, 2808 dsl_get_unique(ds)); 2809 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_OBJSETID, 2810 dsl_get_objsetid(ds)); 2811 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USERREFS, 2812 dsl_get_userrefs(ds)); 2813 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_DEFER_DESTROY, 2814 dsl_get_defer_destroy(ds)); 2815 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_SNAPSHOTS_CHANGED, 2816 dsl_dir_snap_cmtime(ds->ds_dir).tv_sec); 2817 dsl_dataset_crypt_stats(ds, nv); 2818 2819 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) { 2820 uint64_t written; 2821 if (dsl_get_written(ds, &written) == 0) { 2822 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_WRITTEN, 2823 written); 2824 } 2825 } 2826 2827 if (!dsl_dataset_is_snapshot(ds)) { 2828 char *token = get_receive_resume_token(ds); 2829 if (token != NULL) { 2830 dsl_prop_nvlist_add_string(nv, 2831 ZFS_PROP_RECEIVE_RESUME_TOKEN, token); 2832 kmem_strfree(token); 2833 } 2834 } 2835 } 2836 2837 void 2838 dsl_dataset_fast_stat(dsl_dataset_t *ds, dmu_objset_stats_t *stat) 2839 { 2840 dsl_pool_t *dp __maybe_unused = ds->ds_dir->dd_pool; 2841 ASSERT(dsl_pool_config_held(dp)); 2842 2843 stat->dds_creation_txg = dsl_get_creationtxg(ds); 2844 stat->dds_inconsistent = dsl_get_inconsistent(ds); 2845 stat->dds_guid = dsl_get_guid(ds); 2846 stat->dds_redacted = dsl_get_redacted(ds); 2847 stat->dds_origin[0] = '\0'; 2848 if (ds->ds_is_snapshot) { 2849 stat->dds_is_snapshot = B_TRUE; 2850 stat->dds_num_clones = dsl_get_numclones(ds); 2851 } else { 2852 stat->dds_is_snapshot = B_FALSE; 2853 stat->dds_num_clones = 0; 2854 2855 if (dsl_dir_is_clone(ds->ds_dir)) { 2856 dsl_dir_get_origin(ds->ds_dir, stat->dds_origin); 2857 } 2858 } 2859 } 2860 2861 uint64_t 2862 dsl_dataset_fsid_guid(dsl_dataset_t *ds) 2863 { 2864 return (ds->ds_fsid_guid); 2865 } 2866 2867 void 2868 dsl_dataset_space(dsl_dataset_t *ds, 2869 uint64_t *refdbytesp, uint64_t *availbytesp, 2870 uint64_t *usedobjsp, uint64_t *availobjsp) 2871 { 2872 *refdbytesp = dsl_dataset_phys(ds)->ds_referenced_bytes; 2873 *availbytesp = dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE); 2874 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes) 2875 *availbytesp += 2876 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes; 2877 if (ds->ds_quota != 0) { 2878 /* 2879 * Adjust available bytes according to refquota 2880 */ 2881 if (*refdbytesp < ds->ds_quota) 2882 *availbytesp = MIN(*availbytesp, 2883 ds->ds_quota - *refdbytesp); 2884 else 2885 *availbytesp = 0; 2886 } 2887 rrw_enter(&ds->ds_bp_rwlock, RW_READER, FTAG); 2888 *usedobjsp = BP_GET_FILL(&dsl_dataset_phys(ds)->ds_bp); 2889 rrw_exit(&ds->ds_bp_rwlock, FTAG); 2890 *availobjsp = DN_MAX_OBJECT - *usedobjsp; 2891 } 2892 2893 boolean_t 2894 dsl_dataset_modified_since_snap(dsl_dataset_t *ds, dsl_dataset_t *snap) 2895 { 2896 dsl_pool_t *dp __maybe_unused = ds->ds_dir->dd_pool; 2897 uint64_t birth; 2898 2899 ASSERT(dsl_pool_config_held(dp)); 2900 if (snap == NULL) 2901 return (B_FALSE); 2902 rrw_enter(&ds->ds_bp_rwlock, RW_READER, FTAG); 2903 birth = dsl_dataset_get_blkptr(ds)->blk_birth; 2904 rrw_exit(&ds->ds_bp_rwlock, FTAG); 2905 if (birth > dsl_dataset_phys(snap)->ds_creation_txg) { 2906 objset_t *os, *os_snap; 2907 /* 2908 * It may be that only the ZIL differs, because it was 2909 * reset in the head. Don't count that as being 2910 * modified. 2911 */ 2912 if (dmu_objset_from_ds(ds, &os) != 0) 2913 return (B_TRUE); 2914 if (dmu_objset_from_ds(snap, &os_snap) != 0) 2915 return (B_TRUE); 2916 return (memcmp(&os->os_phys->os_meta_dnode, 2917 &os_snap->os_phys->os_meta_dnode, 2918 sizeof (os->os_phys->os_meta_dnode)) != 0); 2919 } 2920 return (B_FALSE); 2921 } 2922 2923 typedef struct dsl_dataset_rename_snapshot_arg { 2924 const char *ddrsa_fsname; 2925 const char *ddrsa_oldsnapname; 2926 const char *ddrsa_newsnapname; 2927 boolean_t ddrsa_recursive; 2928 dmu_tx_t *ddrsa_tx; 2929 } dsl_dataset_rename_snapshot_arg_t; 2930 2931 static int 2932 dsl_dataset_rename_snapshot_check_impl(dsl_pool_t *dp, 2933 dsl_dataset_t *hds, void *arg) 2934 { 2935 (void) dp; 2936 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 2937 int error; 2938 uint64_t val; 2939 2940 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val); 2941 if (error != 0) { 2942 /* ignore nonexistent snapshots */ 2943 return (error == ENOENT ? 0 : error); 2944 } 2945 2946 /* new name should not exist */ 2947 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_newsnapname, &val); 2948 if (error == 0) 2949 error = SET_ERROR(EEXIST); 2950 else if (error == ENOENT) 2951 error = 0; 2952 2953 /* dataset name + 1 for the "@" + the new snapshot name must fit */ 2954 if (dsl_dir_namelen(hds->ds_dir) + 1 + 2955 strlen(ddrsa->ddrsa_newsnapname) >= ZFS_MAX_DATASET_NAME_LEN) 2956 error = SET_ERROR(ENAMETOOLONG); 2957 2958 return (error); 2959 } 2960 2961 static int 2962 dsl_dataset_rename_snapshot_check(void *arg, dmu_tx_t *tx) 2963 { 2964 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 2965 dsl_pool_t *dp = dmu_tx_pool(tx); 2966 dsl_dataset_t *hds; 2967 int error; 2968 2969 error = dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds); 2970 if (error != 0) 2971 return (error); 2972 2973 if (ddrsa->ddrsa_recursive) { 2974 error = dmu_objset_find_dp(dp, hds->ds_dir->dd_object, 2975 dsl_dataset_rename_snapshot_check_impl, ddrsa, 2976 DS_FIND_CHILDREN); 2977 } else { 2978 error = dsl_dataset_rename_snapshot_check_impl(dp, hds, ddrsa); 2979 } 2980 dsl_dataset_rele(hds, FTAG); 2981 return (error); 2982 } 2983 2984 static int 2985 dsl_dataset_rename_snapshot_sync_impl(dsl_pool_t *dp, 2986 dsl_dataset_t *hds, void *arg) 2987 { 2988 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 2989 dsl_dataset_t *ds; 2990 uint64_t val; 2991 dmu_tx_t *tx = ddrsa->ddrsa_tx; 2992 int error; 2993 2994 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val); 2995 ASSERT(error == 0 || error == ENOENT); 2996 if (error == ENOENT) { 2997 /* ignore nonexistent snapshots */ 2998 return (0); 2999 } 3000 3001 VERIFY0(dsl_dataset_hold_obj(dp, val, FTAG, &ds)); 3002 3003 /* log before we change the name */ 3004 spa_history_log_internal_ds(ds, "rename", tx, 3005 "-> @%s", ddrsa->ddrsa_newsnapname); 3006 3007 VERIFY0(dsl_dataset_snap_remove(hds, ddrsa->ddrsa_oldsnapname, tx, 3008 B_FALSE)); 3009 mutex_enter(&ds->ds_lock); 3010 (void) strlcpy(ds->ds_snapname, ddrsa->ddrsa_newsnapname, 3011 sizeof (ds->ds_snapname)); 3012 mutex_exit(&ds->ds_lock); 3013 VERIFY0(zap_add(dp->dp_meta_objset, 3014 dsl_dataset_phys(hds)->ds_snapnames_zapobj, 3015 ds->ds_snapname, 8, 1, &ds->ds_object, tx)); 3016 zvol_rename_minors(dp->dp_spa, ddrsa->ddrsa_oldsnapname, 3017 ddrsa->ddrsa_newsnapname, B_TRUE); 3018 3019 dsl_dataset_rele(ds, FTAG); 3020 return (0); 3021 } 3022 3023 static void 3024 dsl_dataset_rename_snapshot_sync(void *arg, dmu_tx_t *tx) 3025 { 3026 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 3027 dsl_pool_t *dp = dmu_tx_pool(tx); 3028 dsl_dataset_t *hds = NULL; 3029 3030 VERIFY0(dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds)); 3031 ddrsa->ddrsa_tx = tx; 3032 if (ddrsa->ddrsa_recursive) { 3033 VERIFY0(dmu_objset_find_dp(dp, hds->ds_dir->dd_object, 3034 dsl_dataset_rename_snapshot_sync_impl, ddrsa, 3035 DS_FIND_CHILDREN)); 3036 } else { 3037 VERIFY0(dsl_dataset_rename_snapshot_sync_impl(dp, hds, ddrsa)); 3038 } 3039 dsl_dataset_rele(hds, FTAG); 3040 } 3041 3042 int 3043 dsl_dataset_rename_snapshot(const char *fsname, 3044 const char *oldsnapname, const char *newsnapname, boolean_t recursive) 3045 { 3046 dsl_dataset_rename_snapshot_arg_t ddrsa; 3047 3048 ddrsa.ddrsa_fsname = fsname; 3049 ddrsa.ddrsa_oldsnapname = oldsnapname; 3050 ddrsa.ddrsa_newsnapname = newsnapname; 3051 ddrsa.ddrsa_recursive = recursive; 3052 3053 return (dsl_sync_task(fsname, dsl_dataset_rename_snapshot_check, 3054 dsl_dataset_rename_snapshot_sync, &ddrsa, 3055 1, ZFS_SPACE_CHECK_RESERVED)); 3056 } 3057 3058 /* 3059 * If we're doing an ownership handoff, we need to make sure that there is 3060 * only one long hold on the dataset. We're not allowed to change anything here 3061 * so we don't permanently release the long hold or regular hold here. We want 3062 * to do this only when syncing to avoid the dataset unexpectedly going away 3063 * when we release the long hold. 3064 */ 3065 static int 3066 dsl_dataset_handoff_check(dsl_dataset_t *ds, void *owner, dmu_tx_t *tx) 3067 { 3068 boolean_t held = B_FALSE; 3069 3070 if (!dmu_tx_is_syncing(tx)) 3071 return (0); 3072 3073 dsl_dir_t *dd = ds->ds_dir; 3074 mutex_enter(&dd->dd_activity_lock); 3075 uint64_t holds = zfs_refcount_count(&ds->ds_longholds) - 3076 (owner != NULL ? 1 : 0); 3077 /* 3078 * The value of dd_activity_waiters can chance as soon as we drop the 3079 * lock, but we're fine with that; new waiters coming in or old 3080 * waiters leaving doesn't cause problems, since we're going to cancel 3081 * waiters later anyway. The goal of this check is to verify that no 3082 * non-waiters have long-holds, and all new long-holds will be 3083 * prevented because we're holding the pool config as writer. 3084 */ 3085 if (holds != dd->dd_activity_waiters) 3086 held = B_TRUE; 3087 mutex_exit(&dd->dd_activity_lock); 3088 3089 if (held) 3090 return (SET_ERROR(EBUSY)); 3091 3092 return (0); 3093 } 3094 3095 int 3096 dsl_dataset_rollback_check(void *arg, dmu_tx_t *tx) 3097 { 3098 dsl_dataset_rollback_arg_t *ddra = arg; 3099 dsl_pool_t *dp = dmu_tx_pool(tx); 3100 dsl_dataset_t *ds; 3101 int64_t unused_refres_delta; 3102 int error; 3103 3104 error = dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds); 3105 if (error != 0) 3106 return (error); 3107 3108 /* must not be a snapshot */ 3109 if (ds->ds_is_snapshot) { 3110 dsl_dataset_rele(ds, FTAG); 3111 return (SET_ERROR(EINVAL)); 3112 } 3113 3114 /* must have a most recent snapshot */ 3115 if (dsl_dataset_phys(ds)->ds_prev_snap_txg < TXG_INITIAL) { 3116 dsl_dataset_rele(ds, FTAG); 3117 return (SET_ERROR(ESRCH)); 3118 } 3119 3120 /* 3121 * No rollback to a snapshot created in the current txg, because 3122 * the rollback may dirty the dataset and create blocks that are 3123 * not reachable from the rootbp while having a birth txg that 3124 * falls into the snapshot's range. 3125 */ 3126 if (dmu_tx_is_syncing(tx) && 3127 dsl_dataset_phys(ds)->ds_prev_snap_txg >= tx->tx_txg) { 3128 dsl_dataset_rele(ds, FTAG); 3129 return (SET_ERROR(EAGAIN)); 3130 } 3131 3132 /* 3133 * If the expected target snapshot is specified, then check that 3134 * the latest snapshot is it. 3135 */ 3136 if (ddra->ddra_tosnap != NULL) { 3137 dsl_dataset_t *snapds; 3138 3139 /* Check if the target snapshot exists at all. */ 3140 error = dsl_dataset_hold(dp, ddra->ddra_tosnap, FTAG, &snapds); 3141 if (error != 0) { 3142 /* 3143 * ESRCH is used to signal that the target snapshot does 3144 * not exist, while ENOENT is used to report that 3145 * the rolled back dataset does not exist. 3146 * ESRCH is also used to cover other cases where the 3147 * target snapshot is not related to the dataset being 3148 * rolled back such as being in a different pool. 3149 */ 3150 if (error == ENOENT || error == EXDEV) 3151 error = SET_ERROR(ESRCH); 3152 dsl_dataset_rele(ds, FTAG); 3153 return (error); 3154 } 3155 ASSERT(snapds->ds_is_snapshot); 3156 3157 /* Check if the snapshot is the latest snapshot indeed. */ 3158 if (snapds != ds->ds_prev) { 3159 /* 3160 * Distinguish between the case where the only problem 3161 * is intervening snapshots (EEXIST) vs the snapshot 3162 * not being a valid target for rollback (ESRCH). 3163 */ 3164 if (snapds->ds_dir == ds->ds_dir || 3165 (dsl_dir_is_clone(ds->ds_dir) && 3166 dsl_dir_phys(ds->ds_dir)->dd_origin_obj == 3167 snapds->ds_object)) { 3168 error = SET_ERROR(EEXIST); 3169 } else { 3170 error = SET_ERROR(ESRCH); 3171 } 3172 dsl_dataset_rele(snapds, FTAG); 3173 dsl_dataset_rele(ds, FTAG); 3174 return (error); 3175 } 3176 dsl_dataset_rele(snapds, FTAG); 3177 } 3178 3179 /* must not have any bookmarks after the most recent snapshot */ 3180 if (dsl_bookmark_latest_txg(ds) > 3181 dsl_dataset_phys(ds)->ds_prev_snap_txg) { 3182 dsl_dataset_rele(ds, FTAG); 3183 return (SET_ERROR(EEXIST)); 3184 } 3185 3186 error = dsl_dataset_handoff_check(ds, ddra->ddra_owner, tx); 3187 if (error != 0) { 3188 dsl_dataset_rele(ds, FTAG); 3189 return (error); 3190 } 3191 3192 /* 3193 * Check if the snap we are rolling back to uses more than 3194 * the refquota. 3195 */ 3196 if (ds->ds_quota != 0 && 3197 dsl_dataset_phys(ds->ds_prev)->ds_referenced_bytes > ds->ds_quota) { 3198 dsl_dataset_rele(ds, FTAG); 3199 return (SET_ERROR(EDQUOT)); 3200 } 3201 3202 /* 3203 * When we do the clone swap, we will temporarily use more space 3204 * due to the refreservation (the head will no longer have any 3205 * unique space, so the entire amount of the refreservation will need 3206 * to be free). We will immediately destroy the clone, freeing 3207 * this space, but the freeing happens over many txg's. 3208 */ 3209 unused_refres_delta = (int64_t)MIN(ds->ds_reserved, 3210 dsl_dataset_phys(ds)->ds_unique_bytes); 3211 3212 if (unused_refres_delta > 0 && 3213 unused_refres_delta > 3214 dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE)) { 3215 dsl_dataset_rele(ds, FTAG); 3216 return (SET_ERROR(ENOSPC)); 3217 } 3218 3219 dsl_dataset_rele(ds, FTAG); 3220 return (0); 3221 } 3222 3223 void 3224 dsl_dataset_rollback_sync(void *arg, dmu_tx_t *tx) 3225 { 3226 dsl_dataset_rollback_arg_t *ddra = arg; 3227 dsl_pool_t *dp = dmu_tx_pool(tx); 3228 dsl_dataset_t *ds, *clone; 3229 uint64_t cloneobj; 3230 char namebuf[ZFS_MAX_DATASET_NAME_LEN]; 3231 3232 VERIFY0(dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds)); 3233 3234 dsl_dataset_name(ds->ds_prev, namebuf); 3235 fnvlist_add_string(ddra->ddra_result, "target", namebuf); 3236 3237 cloneobj = dsl_dataset_create_sync(ds->ds_dir, "%rollback", 3238 ds->ds_prev, DS_CREATE_FLAG_NODIRTY, kcred, NULL, tx); 3239 3240 VERIFY0(dsl_dataset_hold_obj(dp, cloneobj, FTAG, &clone)); 3241 3242 dsl_dataset_clone_swap_sync_impl(clone, ds, tx); 3243 dsl_dataset_zero_zil(ds, tx); 3244 3245 dsl_destroy_head_sync_impl(clone, tx); 3246 3247 dsl_dataset_rele(clone, FTAG); 3248 dsl_dataset_rele(ds, FTAG); 3249 } 3250 3251 /* 3252 * Rolls back the given filesystem or volume to the most recent snapshot. 3253 * The name of the most recent snapshot will be returned under key "target" 3254 * in the result nvlist. 3255 * 3256 * If owner != NULL: 3257 * - The existing dataset MUST be owned by the specified owner at entry 3258 * - Upon return, dataset will still be held by the same owner, whether we 3259 * succeed or not. 3260 * 3261 * This mode is required any time the existing filesystem is mounted. See 3262 * notes above zfs_suspend_fs() for further details. 3263 */ 3264 int 3265 dsl_dataset_rollback(const char *fsname, const char *tosnap, void *owner, 3266 nvlist_t *result) 3267 { 3268 dsl_dataset_rollback_arg_t ddra; 3269 3270 ddra.ddra_fsname = fsname; 3271 ddra.ddra_tosnap = tosnap; 3272 ddra.ddra_owner = owner; 3273 ddra.ddra_result = result; 3274 3275 return (dsl_sync_task(fsname, dsl_dataset_rollback_check, 3276 dsl_dataset_rollback_sync, &ddra, 3277 1, ZFS_SPACE_CHECK_RESERVED)); 3278 } 3279 3280 struct promotenode { 3281 list_node_t link; 3282 dsl_dataset_t *ds; 3283 }; 3284 3285 static int snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep); 3286 static int promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp, 3287 const void *tag); 3288 static void promote_rele(dsl_dataset_promote_arg_t *ddpa, const void *tag); 3289 3290 int 3291 dsl_dataset_promote_check(void *arg, dmu_tx_t *tx) 3292 { 3293 dsl_dataset_promote_arg_t *ddpa = arg; 3294 dsl_pool_t *dp = dmu_tx_pool(tx); 3295 dsl_dataset_t *hds; 3296 struct promotenode *snap; 3297 dsl_dataset_t *origin_ds, *origin_head; 3298 int err; 3299 uint64_t unused; 3300 uint64_t ss_mv_cnt; 3301 size_t max_snap_len; 3302 boolean_t conflicting_snaps; 3303 3304 err = promote_hold(ddpa, dp, FTAG); 3305 if (err != 0) 3306 return (err); 3307 3308 hds = ddpa->ddpa_clone; 3309 max_snap_len = MAXNAMELEN - strlen(ddpa->ddpa_clonename) - 1; 3310 3311 if (dsl_dataset_phys(hds)->ds_flags & DS_FLAG_NOPROMOTE) { 3312 promote_rele(ddpa, FTAG); 3313 return (SET_ERROR(EXDEV)); 3314 } 3315 3316 snap = list_head(&ddpa->shared_snaps); 3317 origin_head = snap->ds; 3318 if (snap == NULL) { 3319 err = SET_ERROR(ENOENT); 3320 goto out; 3321 } 3322 origin_ds = snap->ds; 3323 3324 /* 3325 * Encrypted clones share a DSL Crypto Key with their origin's dsl dir. 3326 * When doing a promote we must make sure the encryption root for 3327 * both the target and the target's origin does not change to avoid 3328 * needing to rewrap encryption keys 3329 */ 3330 err = dsl_dataset_promote_crypt_check(hds->ds_dir, origin_ds->ds_dir); 3331 if (err != 0) 3332 goto out; 3333 3334 /* 3335 * Compute and check the amount of space to transfer. Since this is 3336 * so expensive, don't do the preliminary check. 3337 */ 3338 if (!dmu_tx_is_syncing(tx)) { 3339 promote_rele(ddpa, FTAG); 3340 return (0); 3341 } 3342 3343 /* compute origin's new unique space */ 3344 snap = list_tail(&ddpa->clone_snaps); 3345 ASSERT(snap != NULL); 3346 ASSERT3U(dsl_dataset_phys(snap->ds)->ds_prev_snap_obj, ==, 3347 origin_ds->ds_object); 3348 dsl_deadlist_space_range(&snap->ds->ds_deadlist, 3349 dsl_dataset_phys(origin_ds)->ds_prev_snap_txg, UINT64_MAX, 3350 &ddpa->unique, &unused, &unused); 3351 3352 /* 3353 * Walk the snapshots that we are moving 3354 * 3355 * Compute space to transfer. Consider the incremental changes 3356 * to used by each snapshot: 3357 * (my used) = (prev's used) + (blocks born) - (blocks killed) 3358 * So each snapshot gave birth to: 3359 * (blocks born) = (my used) - (prev's used) + (blocks killed) 3360 * So a sequence would look like: 3361 * (uN - u(N-1) + kN) + ... + (u1 - u0 + k1) + (u0 - 0 + k0) 3362 * Which simplifies to: 3363 * uN + kN + kN-1 + ... + k1 + k0 3364 * Note however, if we stop before we reach the ORIGIN we get: 3365 * uN + kN + kN-1 + ... + kM - uM-1 3366 */ 3367 conflicting_snaps = B_FALSE; 3368 ss_mv_cnt = 0; 3369 ddpa->used = dsl_dataset_phys(origin_ds)->ds_referenced_bytes; 3370 ddpa->comp = dsl_dataset_phys(origin_ds)->ds_compressed_bytes; 3371 ddpa->uncomp = dsl_dataset_phys(origin_ds)->ds_uncompressed_bytes; 3372 for (snap = list_head(&ddpa->shared_snaps); snap; 3373 snap = list_next(&ddpa->shared_snaps, snap)) { 3374 uint64_t val, dlused, dlcomp, dluncomp; 3375 dsl_dataset_t *ds = snap->ds; 3376 3377 ss_mv_cnt++; 3378 3379 /* 3380 * If there are long holds, we won't be able to evict 3381 * the objset. 3382 */ 3383 if (dsl_dataset_long_held(ds)) { 3384 err = SET_ERROR(EBUSY); 3385 goto out; 3386 } 3387 3388 /* Check that the snapshot name does not conflict */ 3389 VERIFY0(dsl_dataset_get_snapname(ds)); 3390 if (strlen(ds->ds_snapname) >= max_snap_len) { 3391 err = SET_ERROR(ENAMETOOLONG); 3392 goto out; 3393 } 3394 err = dsl_dataset_snap_lookup(hds, ds->ds_snapname, &val); 3395 if (err == 0) { 3396 fnvlist_add_boolean(ddpa->err_ds, 3397 snap->ds->ds_snapname); 3398 conflicting_snaps = B_TRUE; 3399 } else if (err != ENOENT) { 3400 goto out; 3401 } 3402 3403 /* The very first snapshot does not have a deadlist */ 3404 if (dsl_dataset_phys(ds)->ds_prev_snap_obj == 0) 3405 continue; 3406 3407 dsl_deadlist_space(&ds->ds_deadlist, 3408 &dlused, &dlcomp, &dluncomp); 3409 ddpa->used += dlused; 3410 ddpa->comp += dlcomp; 3411 ddpa->uncomp += dluncomp; 3412 } 3413 3414 /* 3415 * Check that bookmarks that are being transferred don't have 3416 * name conflicts. 3417 */ 3418 for (dsl_bookmark_node_t *dbn = avl_first(&origin_head->ds_bookmarks); 3419 dbn != NULL && dbn->dbn_phys.zbm_creation_txg <= 3420 dsl_dataset_phys(origin_ds)->ds_creation_txg; 3421 dbn = AVL_NEXT(&origin_head->ds_bookmarks, dbn)) { 3422 if (strlen(dbn->dbn_name) >= max_snap_len) { 3423 err = SET_ERROR(ENAMETOOLONG); 3424 goto out; 3425 } 3426 zfs_bookmark_phys_t bm; 3427 err = dsl_bookmark_lookup_impl(ddpa->ddpa_clone, 3428 dbn->dbn_name, &bm); 3429 3430 if (err == 0) { 3431 fnvlist_add_boolean(ddpa->err_ds, dbn->dbn_name); 3432 conflicting_snaps = B_TRUE; 3433 } else if (err == ESRCH) { 3434 err = 0; 3435 } else if (err != 0) { 3436 goto out; 3437 } 3438 } 3439 3440 /* 3441 * In order to return the full list of conflicting snapshots, we check 3442 * whether there was a conflict after traversing all of them. 3443 */ 3444 if (conflicting_snaps) { 3445 err = SET_ERROR(EEXIST); 3446 goto out; 3447 } 3448 3449 /* 3450 * If we are a clone of a clone then we never reached ORIGIN, 3451 * so we need to subtract out the clone origin's used space. 3452 */ 3453 if (ddpa->origin_origin) { 3454 ddpa->used -= 3455 dsl_dataset_phys(ddpa->origin_origin)->ds_referenced_bytes; 3456 ddpa->comp -= 3457 dsl_dataset_phys(ddpa->origin_origin)->ds_compressed_bytes; 3458 ddpa->uncomp -= 3459 dsl_dataset_phys(ddpa->origin_origin)-> 3460 ds_uncompressed_bytes; 3461 } 3462 3463 /* Check that there is enough space and limit headroom here */ 3464 err = dsl_dir_transfer_possible(origin_ds->ds_dir, hds->ds_dir, 3465 0, ss_mv_cnt, ddpa->used, ddpa->cr, ddpa->proc); 3466 if (err != 0) 3467 goto out; 3468 3469 /* 3470 * Compute the amounts of space that will be used by snapshots 3471 * after the promotion (for both origin and clone). For each, 3472 * it is the amount of space that will be on all of their 3473 * deadlists (that was not born before their new origin). 3474 */ 3475 if (dsl_dir_phys(hds->ds_dir)->dd_flags & DD_FLAG_USED_BREAKDOWN) { 3476 uint64_t space; 3477 3478 /* 3479 * Note, typically this will not be a clone of a clone, 3480 * so dd_origin_txg will be < TXG_INITIAL, so 3481 * these snaplist_space() -> dsl_deadlist_space_range() 3482 * calls will be fast because they do not have to 3483 * iterate over all bps. 3484 */ 3485 snap = list_head(&ddpa->origin_snaps); 3486 if (snap == NULL) { 3487 err = SET_ERROR(ENOENT); 3488 goto out; 3489 } 3490 err = snaplist_space(&ddpa->shared_snaps, 3491 snap->ds->ds_dir->dd_origin_txg, &ddpa->cloneusedsnap); 3492 if (err != 0) 3493 goto out; 3494 3495 err = snaplist_space(&ddpa->clone_snaps, 3496 snap->ds->ds_dir->dd_origin_txg, &space); 3497 if (err != 0) 3498 goto out; 3499 ddpa->cloneusedsnap += space; 3500 } 3501 if (dsl_dir_phys(origin_ds->ds_dir)->dd_flags & 3502 DD_FLAG_USED_BREAKDOWN) { 3503 err = snaplist_space(&ddpa->origin_snaps, 3504 dsl_dataset_phys(origin_ds)->ds_creation_txg, 3505 &ddpa->originusedsnap); 3506 if (err != 0) 3507 goto out; 3508 } 3509 3510 out: 3511 promote_rele(ddpa, FTAG); 3512 return (err); 3513 } 3514 3515 void 3516 dsl_dataset_promote_sync(void *arg, dmu_tx_t *tx) 3517 { 3518 dsl_dataset_promote_arg_t *ddpa = arg; 3519 dsl_pool_t *dp = dmu_tx_pool(tx); 3520 dsl_dataset_t *hds; 3521 struct promotenode *snap; 3522 dsl_dataset_t *origin_ds; 3523 dsl_dataset_t *origin_head; 3524 dsl_dir_t *dd; 3525 dsl_dir_t *odd = NULL; 3526 uint64_t oldnext_obj; 3527 int64_t delta; 3528 3529 ASSERT(nvlist_empty(ddpa->err_ds)); 3530 3531 VERIFY0(promote_hold(ddpa, dp, FTAG)); 3532 hds = ddpa->ddpa_clone; 3533 3534 ASSERT0(dsl_dataset_phys(hds)->ds_flags & DS_FLAG_NOPROMOTE); 3535 3536 snap = list_head(&ddpa->shared_snaps); 3537 origin_ds = snap->ds; 3538 dd = hds->ds_dir; 3539 3540 snap = list_head(&ddpa->origin_snaps); 3541 origin_head = snap->ds; 3542 3543 /* 3544 * We need to explicitly open odd, since origin_ds's dd will be 3545 * changing. 3546 */ 3547 VERIFY0(dsl_dir_hold_obj(dp, origin_ds->ds_dir->dd_object, 3548 NULL, FTAG, &odd)); 3549 3550 dsl_dataset_promote_crypt_sync(hds->ds_dir, odd, tx); 3551 3552 /* change origin's next snap */ 3553 dmu_buf_will_dirty(origin_ds->ds_dbuf, tx); 3554 oldnext_obj = dsl_dataset_phys(origin_ds)->ds_next_snap_obj; 3555 snap = list_tail(&ddpa->clone_snaps); 3556 ASSERT3U(dsl_dataset_phys(snap->ds)->ds_prev_snap_obj, ==, 3557 origin_ds->ds_object); 3558 dsl_dataset_phys(origin_ds)->ds_next_snap_obj = snap->ds->ds_object; 3559 3560 /* change the origin's next clone */ 3561 if (dsl_dataset_phys(origin_ds)->ds_next_clones_obj) { 3562 dsl_dataset_remove_from_next_clones(origin_ds, 3563 snap->ds->ds_object, tx); 3564 VERIFY0(zap_add_int(dp->dp_meta_objset, 3565 dsl_dataset_phys(origin_ds)->ds_next_clones_obj, 3566 oldnext_obj, tx)); 3567 } 3568 3569 /* change origin */ 3570 dmu_buf_will_dirty(dd->dd_dbuf, tx); 3571 ASSERT3U(dsl_dir_phys(dd)->dd_origin_obj, ==, origin_ds->ds_object); 3572 dsl_dir_phys(dd)->dd_origin_obj = dsl_dir_phys(odd)->dd_origin_obj; 3573 dd->dd_origin_txg = origin_head->ds_dir->dd_origin_txg; 3574 dmu_buf_will_dirty(odd->dd_dbuf, tx); 3575 dsl_dir_phys(odd)->dd_origin_obj = origin_ds->ds_object; 3576 origin_head->ds_dir->dd_origin_txg = 3577 dsl_dataset_phys(origin_ds)->ds_creation_txg; 3578 3579 /* change dd_clone entries */ 3580 if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 3581 VERIFY0(zap_remove_int(dp->dp_meta_objset, 3582 dsl_dir_phys(odd)->dd_clones, hds->ds_object, tx)); 3583 VERIFY0(zap_add_int(dp->dp_meta_objset, 3584 dsl_dir_phys(ddpa->origin_origin->ds_dir)->dd_clones, 3585 hds->ds_object, tx)); 3586 3587 VERIFY0(zap_remove_int(dp->dp_meta_objset, 3588 dsl_dir_phys(ddpa->origin_origin->ds_dir)->dd_clones, 3589 origin_head->ds_object, tx)); 3590 if (dsl_dir_phys(dd)->dd_clones == 0) { 3591 dsl_dir_phys(dd)->dd_clones = 3592 zap_create(dp->dp_meta_objset, DMU_OT_DSL_CLONES, 3593 DMU_OT_NONE, 0, tx); 3594 } 3595 VERIFY0(zap_add_int(dp->dp_meta_objset, 3596 dsl_dir_phys(dd)->dd_clones, origin_head->ds_object, tx)); 3597 } 3598 3599 /* 3600 * Move bookmarks to this dir. 3601 */ 3602 dsl_bookmark_node_t *dbn_next; 3603 for (dsl_bookmark_node_t *dbn = avl_first(&origin_head->ds_bookmarks); 3604 dbn != NULL && dbn->dbn_phys.zbm_creation_txg <= 3605 dsl_dataset_phys(origin_ds)->ds_creation_txg; 3606 dbn = dbn_next) { 3607 dbn_next = AVL_NEXT(&origin_head->ds_bookmarks, dbn); 3608 3609 avl_remove(&origin_head->ds_bookmarks, dbn); 3610 VERIFY0(zap_remove(dp->dp_meta_objset, 3611 origin_head->ds_bookmarks_obj, dbn->dbn_name, tx)); 3612 3613 dsl_bookmark_node_add(hds, dbn, tx); 3614 } 3615 3616 dsl_bookmark_next_changed(hds, origin_ds, tx); 3617 3618 /* move snapshots to this dir */ 3619 for (snap = list_head(&ddpa->shared_snaps); snap; 3620 snap = list_next(&ddpa->shared_snaps, snap)) { 3621 dsl_dataset_t *ds = snap->ds; 3622 3623 /* 3624 * Property callbacks are registered to a particular 3625 * dsl_dir. Since ours is changing, evict the objset 3626 * so that they will be unregistered from the old dsl_dir. 3627 */ 3628 if (ds->ds_objset) { 3629 dmu_objset_evict(ds->ds_objset); 3630 ds->ds_objset = NULL; 3631 } 3632 3633 /* move snap name entry */ 3634 VERIFY0(dsl_dataset_get_snapname(ds)); 3635 VERIFY0(dsl_dataset_snap_remove(origin_head, 3636 ds->ds_snapname, tx, B_TRUE)); 3637 VERIFY0(zap_add(dp->dp_meta_objset, 3638 dsl_dataset_phys(hds)->ds_snapnames_zapobj, ds->ds_snapname, 3639 8, 1, &ds->ds_object, tx)); 3640 dsl_fs_ss_count_adjust(hds->ds_dir, 1, 3641 DD_FIELD_SNAPSHOT_COUNT, tx); 3642 3643 /* change containing dsl_dir */ 3644 dmu_buf_will_dirty(ds->ds_dbuf, tx); 3645 ASSERT3U(dsl_dataset_phys(ds)->ds_dir_obj, ==, odd->dd_object); 3646 dsl_dataset_phys(ds)->ds_dir_obj = dd->dd_object; 3647 ASSERT3P(ds->ds_dir, ==, odd); 3648 dsl_dir_rele(ds->ds_dir, ds); 3649 VERIFY0(dsl_dir_hold_obj(dp, dd->dd_object, 3650 NULL, ds, &ds->ds_dir)); 3651 3652 /* move any clone references */ 3653 if (dsl_dataset_phys(ds)->ds_next_clones_obj && 3654 spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 3655 zap_cursor_t zc; 3656 zap_attribute_t za; 3657 3658 for (zap_cursor_init(&zc, dp->dp_meta_objset, 3659 dsl_dataset_phys(ds)->ds_next_clones_obj); 3660 zap_cursor_retrieve(&zc, &za) == 0; 3661 zap_cursor_advance(&zc)) { 3662 dsl_dataset_t *cnds; 3663 uint64_t o; 3664 3665 if (za.za_first_integer == oldnext_obj) { 3666 /* 3667 * We've already moved the 3668 * origin's reference. 3669 */ 3670 continue; 3671 } 3672 3673 VERIFY0(dsl_dataset_hold_obj(dp, 3674 za.za_first_integer, FTAG, &cnds)); 3675 o = dsl_dir_phys(cnds->ds_dir)-> 3676 dd_head_dataset_obj; 3677 3678 VERIFY0(zap_remove_int(dp->dp_meta_objset, 3679 dsl_dir_phys(odd)->dd_clones, o, tx)); 3680 VERIFY0(zap_add_int(dp->dp_meta_objset, 3681 dsl_dir_phys(dd)->dd_clones, o, tx)); 3682 dsl_dataset_rele(cnds, FTAG); 3683 } 3684 zap_cursor_fini(&zc); 3685 } 3686 3687 ASSERT(!dsl_prop_hascb(ds)); 3688 } 3689 3690 /* 3691 * Change space accounting. 3692 * Note, pa->*usedsnap and dd_used_breakdown[SNAP] will either 3693 * both be valid, or both be 0 (resulting in delta == 0). This 3694 * is true for each of {clone,origin} independently. 3695 */ 3696 3697 delta = ddpa->cloneusedsnap - 3698 dsl_dir_phys(dd)->dd_used_breakdown[DD_USED_SNAP]; 3699 ASSERT3S(delta, >=, 0); 3700 ASSERT3U(ddpa->used, >=, delta); 3701 dsl_dir_diduse_space(dd, DD_USED_SNAP, delta, 0, 0, tx); 3702 dsl_dir_diduse_space(dd, DD_USED_HEAD, 3703 ddpa->used - delta, ddpa->comp, ddpa->uncomp, tx); 3704 3705 delta = ddpa->originusedsnap - 3706 dsl_dir_phys(odd)->dd_used_breakdown[DD_USED_SNAP]; 3707 ASSERT3S(delta, <=, 0); 3708 ASSERT3U(ddpa->used, >=, -delta); 3709 dsl_dir_diduse_space(odd, DD_USED_SNAP, delta, 0, 0, tx); 3710 dsl_dir_diduse_space(odd, DD_USED_HEAD, 3711 -ddpa->used - delta, -ddpa->comp, -ddpa->uncomp, tx); 3712 3713 dsl_dataset_phys(origin_ds)->ds_unique_bytes = ddpa->unique; 3714 3715 /* 3716 * Since livelists are specific to a clone's origin txg, they 3717 * are no longer accurate. Destroy the livelist from the clone being 3718 * promoted. If the origin dataset is a clone, destroy its livelist 3719 * as well. 3720 */ 3721 dsl_dir_remove_livelist(dd, tx, B_TRUE); 3722 dsl_dir_remove_livelist(odd, tx, B_TRUE); 3723 3724 /* log history record */ 3725 spa_history_log_internal_ds(hds, "promote", tx, " "); 3726 3727 dsl_dir_rele(odd, FTAG); 3728 promote_rele(ddpa, FTAG); 3729 3730 /* 3731 * Transfer common error blocks from old head to new head. 3732 */ 3733 if (spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_HEAD_ERRLOG)) { 3734 uint64_t old_head = origin_head->ds_object; 3735 uint64_t new_head = hds->ds_object; 3736 spa_swap_errlog(dp->dp_spa, new_head, old_head, tx); 3737 } 3738 } 3739 3740 /* 3741 * Make a list of dsl_dataset_t's for the snapshots between first_obj 3742 * (exclusive) and last_obj (inclusive). The list will be in reverse 3743 * order (last_obj will be the list_head()). If first_obj == 0, do all 3744 * snapshots back to this dataset's origin. 3745 */ 3746 static int 3747 snaplist_make(dsl_pool_t *dp, 3748 uint64_t first_obj, uint64_t last_obj, list_t *l, const void *tag) 3749 { 3750 uint64_t obj = last_obj; 3751 3752 list_create(l, sizeof (struct promotenode), 3753 offsetof(struct promotenode, link)); 3754 3755 while (obj != first_obj) { 3756 dsl_dataset_t *ds; 3757 struct promotenode *snap; 3758 int err; 3759 3760 err = dsl_dataset_hold_obj(dp, obj, tag, &ds); 3761 ASSERT(err != ENOENT); 3762 if (err != 0) 3763 return (err); 3764 3765 if (first_obj == 0) 3766 first_obj = dsl_dir_phys(ds->ds_dir)->dd_origin_obj; 3767 3768 snap = kmem_alloc(sizeof (*snap), KM_SLEEP); 3769 snap->ds = ds; 3770 list_insert_tail(l, snap); 3771 obj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 3772 } 3773 3774 return (0); 3775 } 3776 3777 static int 3778 snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep) 3779 { 3780 struct promotenode *snap; 3781 3782 *spacep = 0; 3783 for (snap = list_head(l); snap; snap = list_next(l, snap)) { 3784 uint64_t used, comp, uncomp; 3785 dsl_deadlist_space_range(&snap->ds->ds_deadlist, 3786 mintxg, UINT64_MAX, &used, &comp, &uncomp); 3787 *spacep += used; 3788 } 3789 return (0); 3790 } 3791 3792 static void 3793 snaplist_destroy(list_t *l, const void *tag) 3794 { 3795 struct promotenode *snap; 3796 3797 if (l == NULL || !list_link_active(&l->list_head)) 3798 return; 3799 3800 while ((snap = list_tail(l)) != NULL) { 3801 list_remove(l, snap); 3802 dsl_dataset_rele(snap->ds, tag); 3803 kmem_free(snap, sizeof (*snap)); 3804 } 3805 list_destroy(l); 3806 } 3807 3808 static int 3809 promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp, const void *tag) 3810 { 3811 int error; 3812 dsl_dir_t *dd; 3813 struct promotenode *snap; 3814 3815 error = dsl_dataset_hold(dp, ddpa->ddpa_clonename, tag, 3816 &ddpa->ddpa_clone); 3817 if (error != 0) 3818 return (error); 3819 dd = ddpa->ddpa_clone->ds_dir; 3820 3821 if (ddpa->ddpa_clone->ds_is_snapshot || 3822 !dsl_dir_is_clone(dd)) { 3823 dsl_dataset_rele(ddpa->ddpa_clone, tag); 3824 return (SET_ERROR(EINVAL)); 3825 } 3826 3827 error = snaplist_make(dp, 0, dsl_dir_phys(dd)->dd_origin_obj, 3828 &ddpa->shared_snaps, tag); 3829 if (error != 0) 3830 goto out; 3831 3832 error = snaplist_make(dp, 0, ddpa->ddpa_clone->ds_object, 3833 &ddpa->clone_snaps, tag); 3834 if (error != 0) 3835 goto out; 3836 3837 snap = list_head(&ddpa->shared_snaps); 3838 ASSERT3U(snap->ds->ds_object, ==, dsl_dir_phys(dd)->dd_origin_obj); 3839 error = snaplist_make(dp, dsl_dir_phys(dd)->dd_origin_obj, 3840 dsl_dir_phys(snap->ds->ds_dir)->dd_head_dataset_obj, 3841 &ddpa->origin_snaps, tag); 3842 if (error != 0) 3843 goto out; 3844 3845 if (dsl_dir_phys(snap->ds->ds_dir)->dd_origin_obj != 0) { 3846 error = dsl_dataset_hold_obj(dp, 3847 dsl_dir_phys(snap->ds->ds_dir)->dd_origin_obj, 3848 tag, &ddpa->origin_origin); 3849 if (error != 0) 3850 goto out; 3851 } 3852 out: 3853 if (error != 0) 3854 promote_rele(ddpa, tag); 3855 return (error); 3856 } 3857 3858 static void 3859 promote_rele(dsl_dataset_promote_arg_t *ddpa, const void *tag) 3860 { 3861 snaplist_destroy(&ddpa->shared_snaps, tag); 3862 snaplist_destroy(&ddpa->clone_snaps, tag); 3863 snaplist_destroy(&ddpa->origin_snaps, tag); 3864 if (ddpa->origin_origin != NULL) 3865 dsl_dataset_rele(ddpa->origin_origin, tag); 3866 dsl_dataset_rele(ddpa->ddpa_clone, tag); 3867 } 3868 3869 /* 3870 * Promote a clone. 3871 * 3872 * If it fails due to a conflicting snapshot name, "conflsnap" will be filled 3873 * in with the name. (It must be at least ZFS_MAX_DATASET_NAME_LEN bytes long.) 3874 */ 3875 int 3876 dsl_dataset_promote(const char *name, char *conflsnap) 3877 { 3878 dsl_dataset_promote_arg_t ddpa = { 0 }; 3879 uint64_t numsnaps; 3880 int error; 3881 nvpair_t *snap_pair; 3882 objset_t *os; 3883 3884 /* 3885 * We will modify space proportional to the number of 3886 * snapshots. Compute numsnaps. 3887 */ 3888 error = dmu_objset_hold(name, FTAG, &os); 3889 if (error != 0) 3890 return (error); 3891 error = zap_count(dmu_objset_pool(os)->dp_meta_objset, 3892 dsl_dataset_phys(dmu_objset_ds(os))->ds_snapnames_zapobj, 3893 &numsnaps); 3894 dmu_objset_rele(os, FTAG); 3895 if (error != 0) 3896 return (error); 3897 3898 ddpa.ddpa_clonename = name; 3899 ddpa.err_ds = fnvlist_alloc(); 3900 ddpa.cr = CRED(); 3901 ddpa.proc = curproc; 3902 3903 error = dsl_sync_task(name, dsl_dataset_promote_check, 3904 dsl_dataset_promote_sync, &ddpa, 3905 2 + numsnaps, ZFS_SPACE_CHECK_RESERVED); 3906 3907 /* 3908 * Return the first conflicting snapshot found. 3909 */ 3910 snap_pair = nvlist_next_nvpair(ddpa.err_ds, NULL); 3911 if (snap_pair != NULL && conflsnap != NULL) 3912 (void) strlcpy(conflsnap, nvpair_name(snap_pair), 3913 ZFS_MAX_DATASET_NAME_LEN); 3914 3915 fnvlist_free(ddpa.err_ds); 3916 return (error); 3917 } 3918 3919 int 3920 dsl_dataset_clone_swap_check_impl(dsl_dataset_t *clone, 3921 dsl_dataset_t *origin_head, boolean_t force, void *owner, dmu_tx_t *tx) 3922 { 3923 /* 3924 * "slack" factor for received datasets with refquota set on them. 3925 * See the bottom of this function for details on its use. 3926 */ 3927 uint64_t refquota_slack = (uint64_t)DMU_MAX_ACCESS * 3928 spa_asize_inflation; 3929 int64_t unused_refres_delta; 3930 3931 /* they should both be heads */ 3932 if (clone->ds_is_snapshot || 3933 origin_head->ds_is_snapshot) 3934 return (SET_ERROR(EINVAL)); 3935 3936 /* if we are not forcing, the branch point should be just before them */ 3937 if (!force && clone->ds_prev != origin_head->ds_prev) 3938 return (SET_ERROR(EINVAL)); 3939 3940 /* clone should be the clone (unless they are unrelated) */ 3941 if (clone->ds_prev != NULL && 3942 clone->ds_prev != clone->ds_dir->dd_pool->dp_origin_snap && 3943 origin_head->ds_dir != clone->ds_prev->ds_dir) 3944 return (SET_ERROR(EINVAL)); 3945 3946 /* the clone should be a child of the origin */ 3947 if (clone->ds_dir->dd_parent != origin_head->ds_dir) 3948 return (SET_ERROR(EINVAL)); 3949 3950 /* origin_head shouldn't be modified unless 'force' */ 3951 if (!force && 3952 dsl_dataset_modified_since_snap(origin_head, origin_head->ds_prev)) 3953 return (SET_ERROR(ETXTBSY)); 3954 3955 /* origin_head should have no long holds (e.g. is not mounted) */ 3956 if (dsl_dataset_handoff_check(origin_head, owner, tx)) 3957 return (SET_ERROR(EBUSY)); 3958 3959 /* check amount of any unconsumed refreservation */ 3960 unused_refres_delta = 3961 (int64_t)MIN(origin_head->ds_reserved, 3962 dsl_dataset_phys(origin_head)->ds_unique_bytes) - 3963 (int64_t)MIN(origin_head->ds_reserved, 3964 dsl_dataset_phys(clone)->ds_unique_bytes); 3965 3966 if (unused_refres_delta > 0 && 3967 unused_refres_delta > 3968 dsl_dir_space_available(origin_head->ds_dir, NULL, 0, TRUE)) 3969 return (SET_ERROR(ENOSPC)); 3970 3971 /* 3972 * The clone can't be too much over the head's refquota. 3973 * 3974 * To ensure that the entire refquota can be used, we allow one 3975 * transaction to exceed the refquota. Therefore, this check 3976 * needs to also allow for the space referenced to be more than the 3977 * refquota. The maximum amount of space that one transaction can use 3978 * on disk is DMU_MAX_ACCESS * spa_asize_inflation. Allowing this 3979 * overage ensures that we are able to receive a filesystem that 3980 * exceeds the refquota on the source system. 3981 * 3982 * So that overage is the refquota_slack we use below. 3983 */ 3984 if (origin_head->ds_quota != 0 && 3985 dsl_dataset_phys(clone)->ds_referenced_bytes > 3986 origin_head->ds_quota + refquota_slack) 3987 return (SET_ERROR(EDQUOT)); 3988 3989 return (0); 3990 } 3991 3992 static void 3993 dsl_dataset_swap_remap_deadlists(dsl_dataset_t *clone, 3994 dsl_dataset_t *origin, dmu_tx_t *tx) 3995 { 3996 uint64_t clone_remap_dl_obj, origin_remap_dl_obj; 3997 dsl_pool_t *dp = dmu_tx_pool(tx); 3998 3999 ASSERT(dsl_pool_sync_context(dp)); 4000 4001 clone_remap_dl_obj = dsl_dataset_get_remap_deadlist_object(clone); 4002 origin_remap_dl_obj = dsl_dataset_get_remap_deadlist_object(origin); 4003 4004 if (clone_remap_dl_obj != 0) { 4005 dsl_deadlist_close(&clone->ds_remap_deadlist); 4006 dsl_dataset_unset_remap_deadlist_object(clone, tx); 4007 } 4008 if (origin_remap_dl_obj != 0) { 4009 dsl_deadlist_close(&origin->ds_remap_deadlist); 4010 dsl_dataset_unset_remap_deadlist_object(origin, tx); 4011 } 4012 4013 if (clone_remap_dl_obj != 0) { 4014 dsl_dataset_set_remap_deadlist_object(origin, 4015 clone_remap_dl_obj, tx); 4016 dsl_deadlist_open(&origin->ds_remap_deadlist, 4017 dp->dp_meta_objset, clone_remap_dl_obj); 4018 } 4019 if (origin_remap_dl_obj != 0) { 4020 dsl_dataset_set_remap_deadlist_object(clone, 4021 origin_remap_dl_obj, tx); 4022 dsl_deadlist_open(&clone->ds_remap_deadlist, 4023 dp->dp_meta_objset, origin_remap_dl_obj); 4024 } 4025 } 4026 4027 void 4028 dsl_dataset_clone_swap_sync_impl(dsl_dataset_t *clone, 4029 dsl_dataset_t *origin_head, dmu_tx_t *tx) 4030 { 4031 dsl_pool_t *dp = dmu_tx_pool(tx); 4032 int64_t unused_refres_delta; 4033 4034 ASSERT(clone->ds_reserved == 0); 4035 /* 4036 * NOTE: On DEBUG kernels there could be a race between this and 4037 * the check function if spa_asize_inflation is adjusted... 4038 */ 4039 ASSERT(origin_head->ds_quota == 0 || 4040 dsl_dataset_phys(clone)->ds_unique_bytes <= origin_head->ds_quota + 4041 DMU_MAX_ACCESS * spa_asize_inflation); 4042 ASSERT3P(clone->ds_prev, ==, origin_head->ds_prev); 4043 4044 dsl_dir_cancel_waiters(origin_head->ds_dir); 4045 4046 /* 4047 * Swap per-dataset feature flags. 4048 */ 4049 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 4050 if (!(spa_feature_table[f].fi_flags & 4051 ZFEATURE_FLAG_PER_DATASET)) { 4052 ASSERT(!dsl_dataset_feature_is_active(clone, f)); 4053 ASSERT(!dsl_dataset_feature_is_active(origin_head, f)); 4054 continue; 4055 } 4056 4057 boolean_t clone_inuse = dsl_dataset_feature_is_active(clone, f); 4058 void *clone_feature = clone->ds_feature[f]; 4059 boolean_t origin_head_inuse = 4060 dsl_dataset_feature_is_active(origin_head, f); 4061 void *origin_head_feature = origin_head->ds_feature[f]; 4062 4063 if (clone_inuse) 4064 dsl_dataset_deactivate_feature_impl(clone, f, tx); 4065 if (origin_head_inuse) 4066 dsl_dataset_deactivate_feature_impl(origin_head, f, tx); 4067 4068 if (clone_inuse) { 4069 dsl_dataset_activate_feature(origin_head->ds_object, f, 4070 clone_feature, tx); 4071 origin_head->ds_feature[f] = clone_feature; 4072 } 4073 if (origin_head_inuse) { 4074 dsl_dataset_activate_feature(clone->ds_object, f, 4075 origin_head_feature, tx); 4076 clone->ds_feature[f] = origin_head_feature; 4077 } 4078 } 4079 4080 dmu_buf_will_dirty(clone->ds_dbuf, tx); 4081 dmu_buf_will_dirty(origin_head->ds_dbuf, tx); 4082 4083 if (clone->ds_objset != NULL) { 4084 dmu_objset_evict(clone->ds_objset); 4085 clone->ds_objset = NULL; 4086 } 4087 4088 if (origin_head->ds_objset != NULL) { 4089 dmu_objset_evict(origin_head->ds_objset); 4090 origin_head->ds_objset = NULL; 4091 } 4092 4093 unused_refres_delta = 4094 (int64_t)MIN(origin_head->ds_reserved, 4095 dsl_dataset_phys(origin_head)->ds_unique_bytes) - 4096 (int64_t)MIN(origin_head->ds_reserved, 4097 dsl_dataset_phys(clone)->ds_unique_bytes); 4098 4099 /* 4100 * Reset origin's unique bytes. 4101 */ 4102 { 4103 dsl_dataset_t *origin = clone->ds_prev; 4104 uint64_t comp, uncomp; 4105 4106 dmu_buf_will_dirty(origin->ds_dbuf, tx); 4107 dsl_deadlist_space_range(&clone->ds_deadlist, 4108 dsl_dataset_phys(origin)->ds_prev_snap_txg, UINT64_MAX, 4109 &dsl_dataset_phys(origin)->ds_unique_bytes, &comp, &uncomp); 4110 } 4111 4112 /* swap blkptrs */ 4113 { 4114 rrw_enter(&clone->ds_bp_rwlock, RW_WRITER, FTAG); 4115 rrw_enter(&origin_head->ds_bp_rwlock, RW_WRITER, FTAG); 4116 blkptr_t tmp; 4117 tmp = dsl_dataset_phys(origin_head)->ds_bp; 4118 dsl_dataset_phys(origin_head)->ds_bp = 4119 dsl_dataset_phys(clone)->ds_bp; 4120 dsl_dataset_phys(clone)->ds_bp = tmp; 4121 rrw_exit(&origin_head->ds_bp_rwlock, FTAG); 4122 rrw_exit(&clone->ds_bp_rwlock, FTAG); 4123 } 4124 4125 /* set dd_*_bytes */ 4126 { 4127 int64_t dused, dcomp, duncomp; 4128 uint64_t cdl_used, cdl_comp, cdl_uncomp; 4129 uint64_t odl_used, odl_comp, odl_uncomp; 4130 4131 ASSERT3U(dsl_dir_phys(clone->ds_dir)-> 4132 dd_used_breakdown[DD_USED_SNAP], ==, 0); 4133 4134 dsl_deadlist_space(&clone->ds_deadlist, 4135 &cdl_used, &cdl_comp, &cdl_uncomp); 4136 dsl_deadlist_space(&origin_head->ds_deadlist, 4137 &odl_used, &odl_comp, &odl_uncomp); 4138 4139 dused = dsl_dataset_phys(clone)->ds_referenced_bytes + 4140 cdl_used - 4141 (dsl_dataset_phys(origin_head)->ds_referenced_bytes + 4142 odl_used); 4143 dcomp = dsl_dataset_phys(clone)->ds_compressed_bytes + 4144 cdl_comp - 4145 (dsl_dataset_phys(origin_head)->ds_compressed_bytes + 4146 odl_comp); 4147 duncomp = dsl_dataset_phys(clone)->ds_uncompressed_bytes + 4148 cdl_uncomp - 4149 (dsl_dataset_phys(origin_head)->ds_uncompressed_bytes + 4150 odl_uncomp); 4151 4152 dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_HEAD, 4153 dused, dcomp, duncomp, tx); 4154 dsl_dir_diduse_space(clone->ds_dir, DD_USED_HEAD, 4155 -dused, -dcomp, -duncomp, tx); 4156 4157 /* 4158 * The difference in the space used by snapshots is the 4159 * difference in snapshot space due to the head's 4160 * deadlist (since that's the only thing that's 4161 * changing that affects the snapused). 4162 */ 4163 dsl_deadlist_space_range(&clone->ds_deadlist, 4164 origin_head->ds_dir->dd_origin_txg, UINT64_MAX, 4165 &cdl_used, &cdl_comp, &cdl_uncomp); 4166 dsl_deadlist_space_range(&origin_head->ds_deadlist, 4167 origin_head->ds_dir->dd_origin_txg, UINT64_MAX, 4168 &odl_used, &odl_comp, &odl_uncomp); 4169 dsl_dir_transfer_space(origin_head->ds_dir, cdl_used - odl_used, 4170 DD_USED_HEAD, DD_USED_SNAP, tx); 4171 } 4172 4173 /* swap ds_*_bytes */ 4174 SWITCH64(dsl_dataset_phys(origin_head)->ds_referenced_bytes, 4175 dsl_dataset_phys(clone)->ds_referenced_bytes); 4176 SWITCH64(dsl_dataset_phys(origin_head)->ds_compressed_bytes, 4177 dsl_dataset_phys(clone)->ds_compressed_bytes); 4178 SWITCH64(dsl_dataset_phys(origin_head)->ds_uncompressed_bytes, 4179 dsl_dataset_phys(clone)->ds_uncompressed_bytes); 4180 SWITCH64(dsl_dataset_phys(origin_head)->ds_unique_bytes, 4181 dsl_dataset_phys(clone)->ds_unique_bytes); 4182 4183 /* apply any parent delta for change in unconsumed refreservation */ 4184 dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_REFRSRV, 4185 unused_refres_delta, 0, 0, tx); 4186 4187 /* 4188 * Swap deadlists. 4189 */ 4190 dsl_deadlist_close(&clone->ds_deadlist); 4191 dsl_deadlist_close(&origin_head->ds_deadlist); 4192 SWITCH64(dsl_dataset_phys(origin_head)->ds_deadlist_obj, 4193 dsl_dataset_phys(clone)->ds_deadlist_obj); 4194 dsl_deadlist_open(&clone->ds_deadlist, dp->dp_meta_objset, 4195 dsl_dataset_phys(clone)->ds_deadlist_obj); 4196 dsl_deadlist_open(&origin_head->ds_deadlist, dp->dp_meta_objset, 4197 dsl_dataset_phys(origin_head)->ds_deadlist_obj); 4198 dsl_dataset_swap_remap_deadlists(clone, origin_head, tx); 4199 4200 /* 4201 * If there is a bookmark at the origin, its "next dataset" is 4202 * changing, so we need to reset its FBN. 4203 */ 4204 dsl_bookmark_next_changed(origin_head, origin_head->ds_prev, tx); 4205 4206 dsl_scan_ds_clone_swapped(origin_head, clone, tx); 4207 4208 /* 4209 * Destroy any livelists associated with the clone or the origin, 4210 * since after the swap the corresponding livelists are no longer 4211 * valid. 4212 */ 4213 dsl_dir_remove_livelist(clone->ds_dir, tx, B_TRUE); 4214 dsl_dir_remove_livelist(origin_head->ds_dir, tx, B_TRUE); 4215 4216 spa_history_log_internal_ds(clone, "clone swap", tx, 4217 "parent=%s", origin_head->ds_dir->dd_myname); 4218 } 4219 4220 /* 4221 * Given a pool name and a dataset object number in that pool, 4222 * return the name of that dataset. 4223 */ 4224 int 4225 dsl_dsobj_to_dsname(char *pname, uint64_t obj, char *buf) 4226 { 4227 dsl_pool_t *dp; 4228 dsl_dataset_t *ds; 4229 int error; 4230 4231 error = dsl_pool_hold(pname, FTAG, &dp); 4232 if (error != 0) 4233 return (error); 4234 4235 error = dsl_dataset_hold_obj(dp, obj, FTAG, &ds); 4236 if (error == 0) { 4237 dsl_dataset_name(ds, buf); 4238 dsl_dataset_rele(ds, FTAG); 4239 } 4240 dsl_pool_rele(dp, FTAG); 4241 4242 return (error); 4243 } 4244 4245 int 4246 dsl_dataset_check_quota(dsl_dataset_t *ds, boolean_t check_quota, 4247 uint64_t asize, uint64_t inflight, uint64_t *used, uint64_t *ref_rsrv) 4248 { 4249 int error = 0; 4250 4251 ASSERT3S(asize, >, 0); 4252 4253 /* 4254 * *ref_rsrv is the portion of asize that will come from any 4255 * unconsumed refreservation space. 4256 */ 4257 *ref_rsrv = 0; 4258 4259 mutex_enter(&ds->ds_lock); 4260 /* 4261 * Make a space adjustment for reserved bytes. 4262 */ 4263 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes) { 4264 ASSERT3U(*used, >=, 4265 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes); 4266 *used -= 4267 (ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes); 4268 *ref_rsrv = 4269 asize - MIN(asize, parent_delta(ds, asize + inflight)); 4270 } 4271 4272 if (!check_quota || ds->ds_quota == 0) { 4273 mutex_exit(&ds->ds_lock); 4274 return (0); 4275 } 4276 /* 4277 * If they are requesting more space, and our current estimate 4278 * is over quota, they get to try again unless the actual 4279 * on-disk is over quota and there are no pending changes (which 4280 * may free up space for us). 4281 */ 4282 if (dsl_dataset_phys(ds)->ds_referenced_bytes + inflight >= 4283 ds->ds_quota) { 4284 if (inflight > 0 || 4285 dsl_dataset_phys(ds)->ds_referenced_bytes < ds->ds_quota) 4286 error = SET_ERROR(ERESTART); 4287 else 4288 error = SET_ERROR(EDQUOT); 4289 } 4290 mutex_exit(&ds->ds_lock); 4291 4292 return (error); 4293 } 4294 4295 typedef struct dsl_dataset_set_qr_arg { 4296 const char *ddsqra_name; 4297 zprop_source_t ddsqra_source; 4298 uint64_t ddsqra_value; 4299 } dsl_dataset_set_qr_arg_t; 4300 4301 4302 static int 4303 dsl_dataset_set_refquota_check(void *arg, dmu_tx_t *tx) 4304 { 4305 dsl_dataset_set_qr_arg_t *ddsqra = arg; 4306 dsl_pool_t *dp = dmu_tx_pool(tx); 4307 dsl_dataset_t *ds; 4308 int error; 4309 uint64_t newval; 4310 4311 if (spa_version(dp->dp_spa) < SPA_VERSION_REFQUOTA) 4312 return (SET_ERROR(ENOTSUP)); 4313 4314 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds); 4315 if (error != 0) 4316 return (error); 4317 4318 if (ds->ds_is_snapshot) { 4319 dsl_dataset_rele(ds, FTAG); 4320 return (SET_ERROR(EINVAL)); 4321 } 4322 4323 error = dsl_prop_predict(ds->ds_dir, 4324 zfs_prop_to_name(ZFS_PROP_REFQUOTA), 4325 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval); 4326 if (error != 0) { 4327 dsl_dataset_rele(ds, FTAG); 4328 return (error); 4329 } 4330 4331 if (newval == 0) { 4332 dsl_dataset_rele(ds, FTAG); 4333 return (0); 4334 } 4335 4336 if (newval < dsl_dataset_phys(ds)->ds_referenced_bytes || 4337 newval < ds->ds_reserved) { 4338 dsl_dataset_rele(ds, FTAG); 4339 return (SET_ERROR(ENOSPC)); 4340 } 4341 4342 dsl_dataset_rele(ds, FTAG); 4343 return (0); 4344 } 4345 4346 static void 4347 dsl_dataset_set_refquota_sync(void *arg, dmu_tx_t *tx) 4348 { 4349 dsl_dataset_set_qr_arg_t *ddsqra = arg; 4350 dsl_pool_t *dp = dmu_tx_pool(tx); 4351 dsl_dataset_t *ds = NULL; 4352 uint64_t newval; 4353 4354 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds)); 4355 4356 dsl_prop_set_sync_impl(ds, 4357 zfs_prop_to_name(ZFS_PROP_REFQUOTA), 4358 ddsqra->ddsqra_source, sizeof (ddsqra->ddsqra_value), 1, 4359 &ddsqra->ddsqra_value, tx); 4360 4361 VERIFY0(dsl_prop_get_int_ds(ds, 4362 zfs_prop_to_name(ZFS_PROP_REFQUOTA), &newval)); 4363 4364 if (ds->ds_quota != newval) { 4365 dmu_buf_will_dirty(ds->ds_dbuf, tx); 4366 ds->ds_quota = newval; 4367 } 4368 dsl_dataset_rele(ds, FTAG); 4369 } 4370 4371 int 4372 dsl_dataset_set_refquota(const char *dsname, zprop_source_t source, 4373 uint64_t refquota) 4374 { 4375 dsl_dataset_set_qr_arg_t ddsqra; 4376 4377 ddsqra.ddsqra_name = dsname; 4378 ddsqra.ddsqra_source = source; 4379 ddsqra.ddsqra_value = refquota; 4380 4381 return (dsl_sync_task(dsname, dsl_dataset_set_refquota_check, 4382 dsl_dataset_set_refquota_sync, &ddsqra, 0, 4383 ZFS_SPACE_CHECK_EXTRA_RESERVED)); 4384 } 4385 4386 static int 4387 dsl_dataset_set_refreservation_check(void *arg, dmu_tx_t *tx) 4388 { 4389 dsl_dataset_set_qr_arg_t *ddsqra = arg; 4390 dsl_pool_t *dp = dmu_tx_pool(tx); 4391 dsl_dataset_t *ds; 4392 int error; 4393 uint64_t newval, unique; 4394 4395 if (spa_version(dp->dp_spa) < SPA_VERSION_REFRESERVATION) 4396 return (SET_ERROR(ENOTSUP)); 4397 4398 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds); 4399 if (error != 0) 4400 return (error); 4401 4402 if (ds->ds_is_snapshot) { 4403 dsl_dataset_rele(ds, FTAG); 4404 return (SET_ERROR(EINVAL)); 4405 } 4406 4407 error = dsl_prop_predict(ds->ds_dir, 4408 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 4409 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval); 4410 if (error != 0) { 4411 dsl_dataset_rele(ds, FTAG); 4412 return (error); 4413 } 4414 4415 /* 4416 * If we are doing the preliminary check in open context, the 4417 * space estimates may be inaccurate. 4418 */ 4419 if (!dmu_tx_is_syncing(tx)) { 4420 dsl_dataset_rele(ds, FTAG); 4421 return (0); 4422 } 4423 4424 mutex_enter(&ds->ds_lock); 4425 if (!DS_UNIQUE_IS_ACCURATE(ds)) 4426 dsl_dataset_recalc_head_uniq(ds); 4427 unique = dsl_dataset_phys(ds)->ds_unique_bytes; 4428 mutex_exit(&ds->ds_lock); 4429 4430 if (MAX(unique, newval) > MAX(unique, ds->ds_reserved)) { 4431 uint64_t delta = MAX(unique, newval) - 4432 MAX(unique, ds->ds_reserved); 4433 4434 if (delta > 4435 dsl_dir_space_available(ds->ds_dir, NULL, 0, B_TRUE) || 4436 (ds->ds_quota > 0 && newval > ds->ds_quota)) { 4437 dsl_dataset_rele(ds, FTAG); 4438 return (SET_ERROR(ENOSPC)); 4439 } 4440 } 4441 4442 dsl_dataset_rele(ds, FTAG); 4443 return (0); 4444 } 4445 4446 void 4447 dsl_dataset_set_refreservation_sync_impl(dsl_dataset_t *ds, 4448 zprop_source_t source, uint64_t value, dmu_tx_t *tx) 4449 { 4450 uint64_t newval; 4451 uint64_t unique; 4452 int64_t delta; 4453 4454 dsl_prop_set_sync_impl(ds, zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 4455 source, sizeof (value), 1, &value, tx); 4456 4457 VERIFY0(dsl_prop_get_int_ds(ds, 4458 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), &newval)); 4459 4460 dmu_buf_will_dirty(ds->ds_dbuf, tx); 4461 mutex_enter(&ds->ds_dir->dd_lock); 4462 mutex_enter(&ds->ds_lock); 4463 ASSERT(DS_UNIQUE_IS_ACCURATE(ds)); 4464 unique = dsl_dataset_phys(ds)->ds_unique_bytes; 4465 delta = MAX(0, (int64_t)(newval - unique)) - 4466 MAX(0, (int64_t)(ds->ds_reserved - unique)); 4467 ds->ds_reserved = newval; 4468 mutex_exit(&ds->ds_lock); 4469 4470 dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV, delta, 0, 0, tx); 4471 mutex_exit(&ds->ds_dir->dd_lock); 4472 } 4473 4474 static void 4475 dsl_dataset_set_refreservation_sync(void *arg, dmu_tx_t *tx) 4476 { 4477 dsl_dataset_set_qr_arg_t *ddsqra = arg; 4478 dsl_pool_t *dp = dmu_tx_pool(tx); 4479 dsl_dataset_t *ds = NULL; 4480 4481 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds)); 4482 dsl_dataset_set_refreservation_sync_impl(ds, 4483 ddsqra->ddsqra_source, ddsqra->ddsqra_value, tx); 4484 dsl_dataset_rele(ds, FTAG); 4485 } 4486 4487 int 4488 dsl_dataset_set_refreservation(const char *dsname, zprop_source_t source, 4489 uint64_t refreservation) 4490 { 4491 dsl_dataset_set_qr_arg_t ddsqra; 4492 4493 ddsqra.ddsqra_name = dsname; 4494 ddsqra.ddsqra_source = source; 4495 ddsqra.ddsqra_value = refreservation; 4496 4497 return (dsl_sync_task(dsname, dsl_dataset_set_refreservation_check, 4498 dsl_dataset_set_refreservation_sync, &ddsqra, 0, 4499 ZFS_SPACE_CHECK_EXTRA_RESERVED)); 4500 } 4501 4502 typedef struct dsl_dataset_set_compression_arg { 4503 const char *ddsca_name; 4504 zprop_source_t ddsca_source; 4505 uint64_t ddsca_value; 4506 } dsl_dataset_set_compression_arg_t; 4507 4508 static int 4509 dsl_dataset_set_compression_check(void *arg, dmu_tx_t *tx) 4510 { 4511 dsl_dataset_set_compression_arg_t *ddsca = arg; 4512 dsl_pool_t *dp = dmu_tx_pool(tx); 4513 4514 uint64_t compval = ZIO_COMPRESS_ALGO(ddsca->ddsca_value); 4515 spa_feature_t f = zio_compress_to_feature(compval); 4516 4517 if (f == SPA_FEATURE_NONE) 4518 return (SET_ERROR(EINVAL)); 4519 4520 if (!spa_feature_is_enabled(dp->dp_spa, f)) 4521 return (SET_ERROR(ENOTSUP)); 4522 4523 return (0); 4524 } 4525 4526 static void 4527 dsl_dataset_set_compression_sync(void *arg, dmu_tx_t *tx) 4528 { 4529 dsl_dataset_set_compression_arg_t *ddsca = arg; 4530 dsl_pool_t *dp = dmu_tx_pool(tx); 4531 dsl_dataset_t *ds = NULL; 4532 4533 uint64_t compval = ZIO_COMPRESS_ALGO(ddsca->ddsca_value); 4534 spa_feature_t f = zio_compress_to_feature(compval); 4535 ASSERT3S(spa_feature_table[f].fi_type, ==, ZFEATURE_TYPE_BOOLEAN); 4536 4537 VERIFY0(dsl_dataset_hold(dp, ddsca->ddsca_name, FTAG, &ds)); 4538 if (zfeature_active(f, ds->ds_feature[f]) != B_TRUE) { 4539 ds->ds_feature_activation[f] = (void *)B_TRUE; 4540 dsl_dataset_activate_feature(ds->ds_object, f, 4541 ds->ds_feature_activation[f], tx); 4542 ds->ds_feature[f] = ds->ds_feature_activation[f]; 4543 } 4544 dsl_dataset_rele(ds, FTAG); 4545 } 4546 4547 int 4548 dsl_dataset_set_compression(const char *dsname, zprop_source_t source, 4549 uint64_t compression) 4550 { 4551 dsl_dataset_set_compression_arg_t ddsca; 4552 4553 /* 4554 * The sync task is only required for zstd in order to activate 4555 * the feature flag when the property is first set. 4556 */ 4557 if (ZIO_COMPRESS_ALGO(compression) != ZIO_COMPRESS_ZSTD) 4558 return (0); 4559 4560 ddsca.ddsca_name = dsname; 4561 ddsca.ddsca_source = source; 4562 ddsca.ddsca_value = compression; 4563 4564 return (dsl_sync_task(dsname, dsl_dataset_set_compression_check, 4565 dsl_dataset_set_compression_sync, &ddsca, 0, 4566 ZFS_SPACE_CHECK_EXTRA_RESERVED)); 4567 } 4568 4569 /* 4570 * Return (in *usedp) the amount of space referenced by "new" that was not 4571 * referenced at the time the bookmark corresponds to. "New" may be a 4572 * snapshot or a head. The bookmark must be before new, in 4573 * new's filesystem (or its origin) -- caller verifies this. 4574 * 4575 * The written space is calculated by considering two components: First, we 4576 * ignore any freed space, and calculate the written as new's used space 4577 * minus old's used space. Next, we add in the amount of space that was freed 4578 * between the two time points, thus reducing new's used space relative to 4579 * old's. Specifically, this is the space that was born before 4580 * zbm_creation_txg, and freed before new (ie. on new's deadlist or a 4581 * previous deadlist). 4582 * 4583 * space freed [---------------------] 4584 * snapshots ---O-------O--------O-------O------ 4585 * bookmark new 4586 * 4587 * Note, the bookmark's zbm_*_bytes_refd must be valid, but if the HAS_FBN 4588 * flag is not set, we will calculate the freed_before_next based on the 4589 * next snapshot's deadlist, rather than using zbm_*_freed_before_next_snap. 4590 */ 4591 static int 4592 dsl_dataset_space_written_impl(zfs_bookmark_phys_t *bmp, 4593 dsl_dataset_t *new, uint64_t *usedp, uint64_t *compp, uint64_t *uncompp) 4594 { 4595 int err = 0; 4596 dsl_pool_t *dp = new->ds_dir->dd_pool; 4597 4598 ASSERT(dsl_pool_config_held(dp)); 4599 if (dsl_dataset_is_snapshot(new)) { 4600 ASSERT3U(bmp->zbm_creation_txg, <, 4601 dsl_dataset_phys(new)->ds_creation_txg); 4602 } 4603 4604 *usedp = 0; 4605 *usedp += dsl_dataset_phys(new)->ds_referenced_bytes; 4606 *usedp -= bmp->zbm_referenced_bytes_refd; 4607 4608 *compp = 0; 4609 *compp += dsl_dataset_phys(new)->ds_compressed_bytes; 4610 *compp -= bmp->zbm_compressed_bytes_refd; 4611 4612 *uncompp = 0; 4613 *uncompp += dsl_dataset_phys(new)->ds_uncompressed_bytes; 4614 *uncompp -= bmp->zbm_uncompressed_bytes_refd; 4615 4616 dsl_dataset_t *snap = new; 4617 4618 while (dsl_dataset_phys(snap)->ds_prev_snap_txg > 4619 bmp->zbm_creation_txg) { 4620 uint64_t used, comp, uncomp; 4621 4622 dsl_deadlist_space_range(&snap->ds_deadlist, 4623 0, bmp->zbm_creation_txg, 4624 &used, &comp, &uncomp); 4625 *usedp += used; 4626 *compp += comp; 4627 *uncompp += uncomp; 4628 4629 uint64_t snapobj = dsl_dataset_phys(snap)->ds_prev_snap_obj; 4630 if (snap != new) 4631 dsl_dataset_rele(snap, FTAG); 4632 err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &snap); 4633 if (err != 0) 4634 break; 4635 } 4636 4637 /* 4638 * We might not have the FBN if we are calculating written from 4639 * a snapshot (because we didn't know the correct "next" snapshot 4640 * until now). 4641 */ 4642 if (bmp->zbm_flags & ZBM_FLAG_HAS_FBN) { 4643 *usedp += bmp->zbm_referenced_freed_before_next_snap; 4644 *compp += bmp->zbm_compressed_freed_before_next_snap; 4645 *uncompp += bmp->zbm_uncompressed_freed_before_next_snap; 4646 } else { 4647 ASSERT3U(dsl_dataset_phys(snap)->ds_prev_snap_txg, ==, 4648 bmp->zbm_creation_txg); 4649 uint64_t used, comp, uncomp; 4650 dsl_deadlist_space(&snap->ds_deadlist, &used, &comp, &uncomp); 4651 *usedp += used; 4652 *compp += comp; 4653 *uncompp += uncomp; 4654 } 4655 if (snap != new) 4656 dsl_dataset_rele(snap, FTAG); 4657 return (err); 4658 } 4659 4660 /* 4661 * Return (in *usedp) the amount of space written in new that was not 4662 * present at the time the bookmark corresponds to. New may be a 4663 * snapshot or the head. Old must be a bookmark before new, in 4664 * new's filesystem (or its origin) -- caller verifies this. 4665 */ 4666 int 4667 dsl_dataset_space_written_bookmark(zfs_bookmark_phys_t *bmp, 4668 dsl_dataset_t *new, uint64_t *usedp, uint64_t *compp, uint64_t *uncompp) 4669 { 4670 if (!(bmp->zbm_flags & ZBM_FLAG_HAS_FBN)) 4671 return (SET_ERROR(ENOTSUP)); 4672 return (dsl_dataset_space_written_impl(bmp, new, 4673 usedp, compp, uncompp)); 4674 } 4675 4676 /* 4677 * Return (in *usedp) the amount of space written in new that is not 4678 * present in oldsnap. New may be a snapshot or the head. Old must be 4679 * a snapshot before new, in new's filesystem (or its origin). If not then 4680 * fail and return EINVAL. 4681 */ 4682 int 4683 dsl_dataset_space_written(dsl_dataset_t *oldsnap, dsl_dataset_t *new, 4684 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp) 4685 { 4686 if (!dsl_dataset_is_before(new, oldsnap, 0)) 4687 return (SET_ERROR(EINVAL)); 4688 4689 zfs_bookmark_phys_t zbm = { 0 }; 4690 dsl_dataset_phys_t *dsp = dsl_dataset_phys(oldsnap); 4691 zbm.zbm_guid = dsp->ds_guid; 4692 zbm.zbm_creation_txg = dsp->ds_creation_txg; 4693 zbm.zbm_creation_time = dsp->ds_creation_time; 4694 zbm.zbm_referenced_bytes_refd = dsp->ds_referenced_bytes; 4695 zbm.zbm_compressed_bytes_refd = dsp->ds_compressed_bytes; 4696 zbm.zbm_uncompressed_bytes_refd = dsp->ds_uncompressed_bytes; 4697 4698 /* 4699 * If oldsnap is the origin (or origin's origin, ...) of new, 4700 * we can't easily calculate the effective FBN. Therefore, 4701 * we do not set ZBM_FLAG_HAS_FBN, so that the _impl will calculate 4702 * it relative to the correct "next": the next snapshot towards "new", 4703 * rather than the next snapshot in oldsnap's dsl_dir. 4704 */ 4705 return (dsl_dataset_space_written_impl(&zbm, new, 4706 usedp, compp, uncompp)); 4707 } 4708 4709 /* 4710 * Return (in *usedp) the amount of space that will be reclaimed if firstsnap, 4711 * lastsnap, and all snapshots in between are deleted. 4712 * 4713 * blocks that would be freed [---------------------------] 4714 * snapshots ---O-------O--------O-------O--------O 4715 * firstsnap lastsnap 4716 * 4717 * This is the set of blocks that were born after the snap before firstsnap, 4718 * (birth > firstsnap->prev_snap_txg) and died before the snap after the 4719 * last snap (ie, is on lastsnap->ds_next->ds_deadlist or an earlier deadlist). 4720 * We calculate this by iterating over the relevant deadlists (from the snap 4721 * after lastsnap, backward to the snap after firstsnap), summing up the 4722 * space on the deadlist that was born after the snap before firstsnap. 4723 */ 4724 int 4725 dsl_dataset_space_wouldfree(dsl_dataset_t *firstsnap, 4726 dsl_dataset_t *lastsnap, 4727 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp) 4728 { 4729 int err = 0; 4730 uint64_t snapobj; 4731 dsl_pool_t *dp = firstsnap->ds_dir->dd_pool; 4732 4733 ASSERT(firstsnap->ds_is_snapshot); 4734 ASSERT(lastsnap->ds_is_snapshot); 4735 4736 /* 4737 * Check that the snapshots are in the same dsl_dir, and firstsnap 4738 * is before lastsnap. 4739 */ 4740 if (firstsnap->ds_dir != lastsnap->ds_dir || 4741 dsl_dataset_phys(firstsnap)->ds_creation_txg > 4742 dsl_dataset_phys(lastsnap)->ds_creation_txg) 4743 return (SET_ERROR(EINVAL)); 4744 4745 *usedp = *compp = *uncompp = 0; 4746 4747 snapobj = dsl_dataset_phys(lastsnap)->ds_next_snap_obj; 4748 while (snapobj != firstsnap->ds_object) { 4749 dsl_dataset_t *ds; 4750 uint64_t used, comp, uncomp; 4751 4752 err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &ds); 4753 if (err != 0) 4754 break; 4755 4756 dsl_deadlist_space_range(&ds->ds_deadlist, 4757 dsl_dataset_phys(firstsnap)->ds_prev_snap_txg, UINT64_MAX, 4758 &used, &comp, &uncomp); 4759 *usedp += used; 4760 *compp += comp; 4761 *uncompp += uncomp; 4762 4763 snapobj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 4764 ASSERT3U(snapobj, !=, 0); 4765 dsl_dataset_rele(ds, FTAG); 4766 } 4767 return (err); 4768 } 4769 4770 /* 4771 * Return TRUE if 'earlier' is an earlier snapshot in 'later's timeline. 4772 * For example, they could both be snapshots of the same filesystem, and 4773 * 'earlier' is before 'later'. Or 'earlier' could be the origin of 4774 * 'later's filesystem. Or 'earlier' could be an older snapshot in the origin's 4775 * filesystem. Or 'earlier' could be the origin's origin. 4776 * 4777 * If non-zero, earlier_txg is used instead of earlier's ds_creation_txg. 4778 */ 4779 boolean_t 4780 dsl_dataset_is_before(dsl_dataset_t *later, dsl_dataset_t *earlier, 4781 uint64_t earlier_txg) 4782 { 4783 dsl_pool_t *dp = later->ds_dir->dd_pool; 4784 int error; 4785 boolean_t ret; 4786 4787 ASSERT(dsl_pool_config_held(dp)); 4788 ASSERT(earlier->ds_is_snapshot || earlier_txg != 0); 4789 4790 if (earlier_txg == 0) 4791 earlier_txg = dsl_dataset_phys(earlier)->ds_creation_txg; 4792 4793 if (later->ds_is_snapshot && 4794 earlier_txg >= dsl_dataset_phys(later)->ds_creation_txg) 4795 return (B_FALSE); 4796 4797 if (later->ds_dir == earlier->ds_dir) 4798 return (B_TRUE); 4799 4800 /* 4801 * We check dd_origin_obj explicitly here rather than using 4802 * dsl_dir_is_clone() so that we will return TRUE if "earlier" 4803 * is $ORIGIN@$ORIGIN. dsl_dataset_space_written() depends on 4804 * this behavior. 4805 */ 4806 if (dsl_dir_phys(later->ds_dir)->dd_origin_obj == 0) 4807 return (B_FALSE); 4808 4809 dsl_dataset_t *origin; 4810 error = dsl_dataset_hold_obj(dp, 4811 dsl_dir_phys(later->ds_dir)->dd_origin_obj, FTAG, &origin); 4812 if (error != 0) 4813 return (B_FALSE); 4814 if (dsl_dataset_phys(origin)->ds_creation_txg == earlier_txg && 4815 origin->ds_dir == earlier->ds_dir) { 4816 dsl_dataset_rele(origin, FTAG); 4817 return (B_TRUE); 4818 } 4819 ret = dsl_dataset_is_before(origin, earlier, earlier_txg); 4820 dsl_dataset_rele(origin, FTAG); 4821 return (ret); 4822 } 4823 4824 void 4825 dsl_dataset_zapify(dsl_dataset_t *ds, dmu_tx_t *tx) 4826 { 4827 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 4828 dmu_object_zapify(mos, ds->ds_object, DMU_OT_DSL_DATASET, tx); 4829 } 4830 4831 boolean_t 4832 dsl_dataset_is_zapified(dsl_dataset_t *ds) 4833 { 4834 dmu_object_info_t doi; 4835 4836 dmu_object_info_from_db(ds->ds_dbuf, &doi); 4837 return (doi.doi_type == DMU_OTN_ZAP_METADATA); 4838 } 4839 4840 boolean_t 4841 dsl_dataset_has_resume_receive_state(dsl_dataset_t *ds) 4842 { 4843 return (dsl_dataset_is_zapified(ds) && 4844 zap_contains(ds->ds_dir->dd_pool->dp_meta_objset, 4845 ds->ds_object, DS_FIELD_RESUME_TOGUID) == 0); 4846 } 4847 4848 uint64_t 4849 dsl_dataset_get_remap_deadlist_object(dsl_dataset_t *ds) 4850 { 4851 uint64_t remap_deadlist_obj; 4852 int err; 4853 4854 if (!dsl_dataset_is_zapified(ds)) 4855 return (0); 4856 4857 err = zap_lookup(ds->ds_dir->dd_pool->dp_meta_objset, ds->ds_object, 4858 DS_FIELD_REMAP_DEADLIST, sizeof (remap_deadlist_obj), 1, 4859 &remap_deadlist_obj); 4860 4861 if (err != 0) { 4862 VERIFY3S(err, ==, ENOENT); 4863 return (0); 4864 } 4865 4866 ASSERT(remap_deadlist_obj != 0); 4867 return (remap_deadlist_obj); 4868 } 4869 4870 boolean_t 4871 dsl_dataset_remap_deadlist_exists(dsl_dataset_t *ds) 4872 { 4873 EQUIV(dsl_deadlist_is_open(&ds->ds_remap_deadlist), 4874 dsl_dataset_get_remap_deadlist_object(ds) != 0); 4875 return (dsl_deadlist_is_open(&ds->ds_remap_deadlist)); 4876 } 4877 4878 static void 4879 dsl_dataset_set_remap_deadlist_object(dsl_dataset_t *ds, uint64_t obj, 4880 dmu_tx_t *tx) 4881 { 4882 ASSERT(obj != 0); 4883 dsl_dataset_zapify(ds, tx); 4884 VERIFY0(zap_add(ds->ds_dir->dd_pool->dp_meta_objset, ds->ds_object, 4885 DS_FIELD_REMAP_DEADLIST, sizeof (obj), 1, &obj, tx)); 4886 } 4887 4888 static void 4889 dsl_dataset_unset_remap_deadlist_object(dsl_dataset_t *ds, dmu_tx_t *tx) 4890 { 4891 VERIFY0(zap_remove(ds->ds_dir->dd_pool->dp_meta_objset, 4892 ds->ds_object, DS_FIELD_REMAP_DEADLIST, tx)); 4893 } 4894 4895 void 4896 dsl_dataset_destroy_remap_deadlist(dsl_dataset_t *ds, dmu_tx_t *tx) 4897 { 4898 uint64_t remap_deadlist_object; 4899 spa_t *spa = ds->ds_dir->dd_pool->dp_spa; 4900 4901 ASSERT(dmu_tx_is_syncing(tx)); 4902 ASSERT(dsl_dataset_remap_deadlist_exists(ds)); 4903 4904 remap_deadlist_object = ds->ds_remap_deadlist.dl_object; 4905 dsl_deadlist_close(&ds->ds_remap_deadlist); 4906 dsl_deadlist_free(spa_meta_objset(spa), remap_deadlist_object, tx); 4907 dsl_dataset_unset_remap_deadlist_object(ds, tx); 4908 spa_feature_decr(spa, SPA_FEATURE_OBSOLETE_COUNTS, tx); 4909 } 4910 4911 void 4912 dsl_dataset_create_remap_deadlist(dsl_dataset_t *ds, dmu_tx_t *tx) 4913 { 4914 uint64_t remap_deadlist_obj; 4915 spa_t *spa = ds->ds_dir->dd_pool->dp_spa; 4916 4917 ASSERT(dmu_tx_is_syncing(tx)); 4918 ASSERT(MUTEX_HELD(&ds->ds_remap_deadlist_lock)); 4919 /* 4920 * Currently we only create remap deadlists when there are indirect 4921 * vdevs with referenced mappings. 4922 */ 4923 ASSERT(spa_feature_is_active(spa, SPA_FEATURE_DEVICE_REMOVAL)); 4924 4925 remap_deadlist_obj = dsl_deadlist_clone( 4926 &ds->ds_deadlist, UINT64_MAX, 4927 dsl_dataset_phys(ds)->ds_prev_snap_obj, tx); 4928 dsl_dataset_set_remap_deadlist_object(ds, 4929 remap_deadlist_obj, tx); 4930 dsl_deadlist_open(&ds->ds_remap_deadlist, spa_meta_objset(spa), 4931 remap_deadlist_obj); 4932 spa_feature_incr(spa, SPA_FEATURE_OBSOLETE_COUNTS, tx); 4933 } 4934 4935 void 4936 dsl_dataset_activate_redaction(dsl_dataset_t *ds, uint64_t *redact_snaps, 4937 uint64_t num_redact_snaps, dmu_tx_t *tx) 4938 { 4939 uint64_t dsobj = ds->ds_object; 4940 struct feature_type_uint64_array_arg *ftuaa = 4941 kmem_zalloc(sizeof (*ftuaa), KM_SLEEP); 4942 ftuaa->length = (int64_t)num_redact_snaps; 4943 if (num_redact_snaps > 0) { 4944 ftuaa->array = kmem_alloc(num_redact_snaps * sizeof (uint64_t), 4945 KM_SLEEP); 4946 memcpy(ftuaa->array, redact_snaps, num_redact_snaps * 4947 sizeof (uint64_t)); 4948 } 4949 dsl_dataset_activate_feature(dsobj, SPA_FEATURE_REDACTED_DATASETS, 4950 ftuaa, tx); 4951 ds->ds_feature[SPA_FEATURE_REDACTED_DATASETS] = ftuaa; 4952 } 4953 4954 /* 4955 * Find and return (in *oldest_dsobj) the oldest snapshot of the dsobj 4956 * dataset whose birth time is >= min_txg. 4957 */ 4958 int 4959 dsl_dataset_oldest_snapshot(spa_t *spa, uint64_t head_ds, uint64_t min_txg, 4960 uint64_t *oldest_dsobj) 4961 { 4962 dsl_dataset_t *ds; 4963 dsl_pool_t *dp = spa->spa_dsl_pool; 4964 4965 int error = dsl_dataset_hold_obj(dp, head_ds, FTAG, &ds); 4966 if (error != 0) 4967 return (error); 4968 4969 uint64_t prev_obj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 4970 uint64_t prev_obj_txg = dsl_dataset_phys(ds)->ds_prev_snap_txg; 4971 4972 while (prev_obj != 0 && min_txg < prev_obj_txg) { 4973 dsl_dataset_rele(ds, FTAG); 4974 if ((error = dsl_dataset_hold_obj(dp, prev_obj, 4975 FTAG, &ds)) != 0) 4976 return (error); 4977 prev_obj_txg = dsl_dataset_phys(ds)->ds_prev_snap_txg; 4978 prev_obj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 4979 } 4980 *oldest_dsobj = ds->ds_object; 4981 dsl_dataset_rele(ds, FTAG); 4982 return (0); 4983 } 4984 4985 ZFS_MODULE_PARAM(zfs, zfs_, max_recordsize, INT, ZMOD_RW, 4986 "Max allowed record size"); 4987 4988 ZFS_MODULE_PARAM(zfs, zfs_, allow_redacted_dataset_mount, INT, ZMOD_RW, 4989 "Allow mounting of redacted datasets"); 4990 4991 ZFS_MODULE_PARAM(zfs, zfs_, snapshot_history_enabled, INT, ZMOD_RW, 4992 "Include snapshot events in pool history/events"); 4993 4994 EXPORT_SYMBOL(dsl_dataset_hold); 4995 EXPORT_SYMBOL(dsl_dataset_hold_flags); 4996 EXPORT_SYMBOL(dsl_dataset_hold_obj); 4997 EXPORT_SYMBOL(dsl_dataset_hold_obj_flags); 4998 EXPORT_SYMBOL(dsl_dataset_own); 4999 EXPORT_SYMBOL(dsl_dataset_own_obj); 5000 EXPORT_SYMBOL(dsl_dataset_name); 5001 EXPORT_SYMBOL(dsl_dataset_rele); 5002 EXPORT_SYMBOL(dsl_dataset_rele_flags); 5003 EXPORT_SYMBOL(dsl_dataset_disown); 5004 EXPORT_SYMBOL(dsl_dataset_tryown); 5005 EXPORT_SYMBOL(dsl_dataset_create_sync); 5006 EXPORT_SYMBOL(dsl_dataset_create_sync_dd); 5007 EXPORT_SYMBOL(dsl_dataset_snapshot_check); 5008 EXPORT_SYMBOL(dsl_dataset_snapshot_sync); 5009 EXPORT_SYMBOL(dsl_dataset_promote); 5010 EXPORT_SYMBOL(dsl_dataset_user_hold); 5011 EXPORT_SYMBOL(dsl_dataset_user_release); 5012 EXPORT_SYMBOL(dsl_dataset_get_holds); 5013 EXPORT_SYMBOL(dsl_dataset_get_blkptr); 5014 EXPORT_SYMBOL(dsl_dataset_get_spa); 5015 EXPORT_SYMBOL(dsl_dataset_modified_since_snap); 5016 EXPORT_SYMBOL(dsl_dataset_space_written); 5017 EXPORT_SYMBOL(dsl_dataset_space_wouldfree); 5018 EXPORT_SYMBOL(dsl_dataset_sync); 5019 EXPORT_SYMBOL(dsl_dataset_block_born); 5020 EXPORT_SYMBOL(dsl_dataset_block_kill); 5021 EXPORT_SYMBOL(dsl_dataset_dirty); 5022 EXPORT_SYMBOL(dsl_dataset_stats); 5023 EXPORT_SYMBOL(dsl_dataset_fast_stat); 5024 EXPORT_SYMBOL(dsl_dataset_space); 5025 EXPORT_SYMBOL(dsl_dataset_fsid_guid); 5026 EXPORT_SYMBOL(dsl_dsobj_to_dsname); 5027 EXPORT_SYMBOL(dsl_dataset_check_quota); 5028 EXPORT_SYMBOL(dsl_dataset_clone_swap_check_impl); 5029 EXPORT_SYMBOL(dsl_dataset_clone_swap_sync_impl); 5030 EXPORT_SYMBOL(dsl_dataset_feature_set_activation); 5031