1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or https://opensource.org/licenses/CDDL-1.0. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 24 * Copyright (c) 2011, 2020 by Delphix. All rights reserved. 25 * Copyright (c) 2014, Joyent, Inc. All rights reserved. 26 * Copyright (c) 2014 RackTop Systems. 27 * Copyright (c) 2014 Spectra Logic Corporation, All rights reserved. 28 * Copyright (c) 2016 Actifio, Inc. All rights reserved. 29 * Copyright 2016, OmniTI Computer Consulting, Inc. All rights reserved. 30 * Copyright 2017 Nexenta Systems, Inc. 31 * Copyright (c) 2019, Klara Inc. 32 * Copyright (c) 2019, Allan Jude 33 * Copyright (c) 2020 The FreeBSD Foundation [1] 34 * 35 * [1] Portions of this software were developed by Allan Jude 36 * under sponsorship from the FreeBSD Foundation. 37 */ 38 39 #include <sys/dmu_objset.h> 40 #include <sys/dsl_dataset.h> 41 #include <sys/dsl_dir.h> 42 #include <sys/dsl_prop.h> 43 #include <sys/dsl_synctask.h> 44 #include <sys/dmu_traverse.h> 45 #include <sys/dmu_impl.h> 46 #include <sys/dmu_tx.h> 47 #include <sys/arc.h> 48 #include <sys/zio.h> 49 #include <sys/zap.h> 50 #include <sys/zfeature.h> 51 #include <sys/unique.h> 52 #include <sys/zfs_context.h> 53 #include <sys/zfs_ioctl.h> 54 #include <sys/spa.h> 55 #include <sys/spa_impl.h> 56 #include <sys/vdev.h> 57 #include <sys/zfs_znode.h> 58 #include <sys/zfs_onexit.h> 59 #include <sys/zvol.h> 60 #include <sys/dsl_scan.h> 61 #include <sys/dsl_deadlist.h> 62 #include <sys/dsl_destroy.h> 63 #include <sys/dsl_userhold.h> 64 #include <sys/dsl_bookmark.h> 65 #include <sys/policy.h> 66 #include <sys/dmu_send.h> 67 #include <sys/dmu_recv.h> 68 #include <sys/zio_compress.h> 69 #include <zfs_fletcher.h> 70 #include <sys/zio_checksum.h> 71 72 /* 73 * The SPA supports block sizes up to 16MB. However, very large blocks 74 * can have an impact on i/o latency (e.g. tying up a spinning disk for 75 * ~300ms), and also potentially on the memory allocator. Therefore, 76 * we did not allow the recordsize to be set larger than zfs_max_recordsize 77 * (former default: 1MB). Larger blocks could be created by changing this 78 * tunable, and pools with larger blocks could always be imported and used, 79 * regardless of this setting. 80 * 81 * We do, however, still limit it by default to 1M on x86_32, because Linux's 82 * 3/1 memory split doesn't leave much room for 16M chunks. 83 */ 84 #ifdef _ILP32 85 uint_t zfs_max_recordsize = 1 * 1024 * 1024; 86 #else 87 uint_t zfs_max_recordsize = 16 * 1024 * 1024; 88 #endif 89 static int zfs_allow_redacted_dataset_mount = 0; 90 91 int zfs_snapshot_history_enabled = 1; 92 93 #define SWITCH64(x, y) \ 94 { \ 95 uint64_t __tmp = (x); \ 96 (x) = (y); \ 97 (y) = __tmp; \ 98 } 99 100 #define DS_REF_MAX (1ULL << 62) 101 102 static void dsl_dataset_set_remap_deadlist_object(dsl_dataset_t *ds, 103 uint64_t obj, dmu_tx_t *tx); 104 static void dsl_dataset_unset_remap_deadlist_object(dsl_dataset_t *ds, 105 dmu_tx_t *tx); 106 107 static void unload_zfeature(dsl_dataset_t *ds, spa_feature_t f); 108 109 extern uint_t spa_asize_inflation; 110 111 static zil_header_t zero_zil; 112 113 /* 114 * Figure out how much of this delta should be propagated to the dsl_dir 115 * layer. If there's a refreservation, that space has already been 116 * partially accounted for in our ancestors. 117 */ 118 static int64_t 119 parent_delta(dsl_dataset_t *ds, int64_t delta) 120 { 121 dsl_dataset_phys_t *ds_phys; 122 uint64_t old_bytes, new_bytes; 123 124 if (ds->ds_reserved == 0) 125 return (delta); 126 127 ds_phys = dsl_dataset_phys(ds); 128 old_bytes = MAX(ds_phys->ds_unique_bytes, ds->ds_reserved); 129 new_bytes = MAX(ds_phys->ds_unique_bytes + delta, ds->ds_reserved); 130 131 ASSERT3U(ABS((int64_t)(new_bytes - old_bytes)), <=, ABS(delta)); 132 return (new_bytes - old_bytes); 133 } 134 135 void 136 dsl_dataset_block_born(dsl_dataset_t *ds, const blkptr_t *bp, dmu_tx_t *tx) 137 { 138 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 139 int used = bp_get_dsize_sync(spa, bp); 140 int compressed = BP_GET_PSIZE(bp); 141 int uncompressed = BP_GET_UCSIZE(bp); 142 int64_t delta; 143 spa_feature_t f; 144 145 dprintf_bp(bp, "ds=%p", ds); 146 147 ASSERT(dmu_tx_is_syncing(tx)); 148 /* It could have been compressed away to nothing */ 149 if (BP_IS_HOLE(bp) || BP_IS_REDACTED(bp)) 150 return; 151 ASSERT(BP_GET_TYPE(bp) != DMU_OT_NONE); 152 ASSERT(DMU_OT_IS_VALID(BP_GET_TYPE(bp))); 153 if (ds == NULL) { 154 dsl_pool_mos_diduse_space(tx->tx_pool, 155 used, compressed, uncompressed); 156 return; 157 } 158 159 ASSERT3U(bp->blk_birth, >, dsl_dataset_phys(ds)->ds_prev_snap_txg); 160 dmu_buf_will_dirty(ds->ds_dbuf, tx); 161 mutex_enter(&ds->ds_lock); 162 delta = parent_delta(ds, used); 163 dsl_dataset_phys(ds)->ds_referenced_bytes += used; 164 dsl_dataset_phys(ds)->ds_compressed_bytes += compressed; 165 dsl_dataset_phys(ds)->ds_uncompressed_bytes += uncompressed; 166 dsl_dataset_phys(ds)->ds_unique_bytes += used; 167 168 if (BP_GET_LSIZE(bp) > SPA_OLD_MAXBLOCKSIZE) { 169 ds->ds_feature_activation[SPA_FEATURE_LARGE_BLOCKS] = 170 (void *)B_TRUE; 171 } 172 173 174 f = zio_checksum_to_feature(BP_GET_CHECKSUM(bp)); 175 if (f != SPA_FEATURE_NONE) { 176 ASSERT3S(spa_feature_table[f].fi_type, ==, 177 ZFEATURE_TYPE_BOOLEAN); 178 ds->ds_feature_activation[f] = (void *)B_TRUE; 179 } 180 181 f = zio_compress_to_feature(BP_GET_COMPRESS(bp)); 182 if (f != SPA_FEATURE_NONE) { 183 ASSERT3S(spa_feature_table[f].fi_type, ==, 184 ZFEATURE_TYPE_BOOLEAN); 185 ds->ds_feature_activation[f] = (void *)B_TRUE; 186 } 187 188 /* 189 * Track block for livelist, but ignore embedded blocks because 190 * they do not need to be freed. 191 */ 192 if (dsl_deadlist_is_open(&ds->ds_dir->dd_livelist) && 193 bp->blk_birth > ds->ds_dir->dd_origin_txg && 194 !(BP_IS_EMBEDDED(bp))) { 195 ASSERT(dsl_dir_is_clone(ds->ds_dir)); 196 ASSERT(spa_feature_is_enabled(spa, 197 SPA_FEATURE_LIVELIST)); 198 bplist_append(&ds->ds_dir->dd_pending_allocs, bp); 199 } 200 201 mutex_exit(&ds->ds_lock); 202 dsl_dir_diduse_transfer_space(ds->ds_dir, delta, 203 compressed, uncompressed, used, 204 DD_USED_REFRSRV, DD_USED_HEAD, tx); 205 } 206 207 /* 208 * Called when the specified segment has been remapped, and is thus no 209 * longer referenced in the head dataset. The vdev must be indirect. 210 * 211 * If the segment is referenced by a snapshot, put it on the remap deadlist. 212 * Otherwise, add this segment to the obsolete spacemap. 213 */ 214 void 215 dsl_dataset_block_remapped(dsl_dataset_t *ds, uint64_t vdev, uint64_t offset, 216 uint64_t size, uint64_t birth, dmu_tx_t *tx) 217 { 218 spa_t *spa = ds->ds_dir->dd_pool->dp_spa; 219 220 ASSERT(dmu_tx_is_syncing(tx)); 221 ASSERT(birth <= tx->tx_txg); 222 ASSERT(!ds->ds_is_snapshot); 223 224 if (birth > dsl_dataset_phys(ds)->ds_prev_snap_txg) { 225 spa_vdev_indirect_mark_obsolete(spa, vdev, offset, size, tx); 226 } else { 227 blkptr_t fakebp; 228 dva_t *dva = &fakebp.blk_dva[0]; 229 230 ASSERT(ds != NULL); 231 232 mutex_enter(&ds->ds_remap_deadlist_lock); 233 if (!dsl_dataset_remap_deadlist_exists(ds)) { 234 dsl_dataset_create_remap_deadlist(ds, tx); 235 } 236 mutex_exit(&ds->ds_remap_deadlist_lock); 237 238 BP_ZERO(&fakebp); 239 fakebp.blk_birth = birth; 240 DVA_SET_VDEV(dva, vdev); 241 DVA_SET_OFFSET(dva, offset); 242 DVA_SET_ASIZE(dva, size); 243 dsl_deadlist_insert(&ds->ds_remap_deadlist, &fakebp, B_FALSE, 244 tx); 245 } 246 } 247 248 int 249 dsl_dataset_block_kill(dsl_dataset_t *ds, const blkptr_t *bp, dmu_tx_t *tx, 250 boolean_t async) 251 { 252 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 253 254 int used = bp_get_dsize_sync(spa, bp); 255 int compressed = BP_GET_PSIZE(bp); 256 int uncompressed = BP_GET_UCSIZE(bp); 257 258 if (BP_IS_HOLE(bp) || BP_IS_REDACTED(bp)) 259 return (0); 260 261 ASSERT(dmu_tx_is_syncing(tx)); 262 ASSERT(bp->blk_birth <= tx->tx_txg); 263 264 if (ds == NULL) { 265 dsl_free(tx->tx_pool, tx->tx_txg, bp); 266 dsl_pool_mos_diduse_space(tx->tx_pool, 267 -used, -compressed, -uncompressed); 268 return (used); 269 } 270 ASSERT3P(tx->tx_pool, ==, ds->ds_dir->dd_pool); 271 272 ASSERT(!ds->ds_is_snapshot); 273 dmu_buf_will_dirty(ds->ds_dbuf, tx); 274 275 /* 276 * Track block for livelist, but ignore embedded blocks because 277 * they do not need to be freed. 278 */ 279 if (dsl_deadlist_is_open(&ds->ds_dir->dd_livelist) && 280 bp->blk_birth > ds->ds_dir->dd_origin_txg && 281 !(BP_IS_EMBEDDED(bp))) { 282 ASSERT(dsl_dir_is_clone(ds->ds_dir)); 283 ASSERT(spa_feature_is_enabled(spa, 284 SPA_FEATURE_LIVELIST)); 285 bplist_append(&ds->ds_dir->dd_pending_frees, bp); 286 } 287 288 if (bp->blk_birth > dsl_dataset_phys(ds)->ds_prev_snap_txg) { 289 int64_t delta; 290 291 dprintf_bp(bp, "freeing ds=%llu", (u_longlong_t)ds->ds_object); 292 dsl_free(tx->tx_pool, tx->tx_txg, bp); 293 294 mutex_enter(&ds->ds_lock); 295 ASSERT(dsl_dataset_phys(ds)->ds_unique_bytes >= used || 296 !DS_UNIQUE_IS_ACCURATE(ds)); 297 delta = parent_delta(ds, -used); 298 dsl_dataset_phys(ds)->ds_unique_bytes -= used; 299 mutex_exit(&ds->ds_lock); 300 dsl_dir_diduse_transfer_space(ds->ds_dir, 301 delta, -compressed, -uncompressed, -used, 302 DD_USED_REFRSRV, DD_USED_HEAD, tx); 303 } else { 304 dprintf_bp(bp, "putting on dead list: %s", ""); 305 if (async) { 306 /* 307 * We are here as part of zio's write done callback, 308 * which means we're a zio interrupt thread. We can't 309 * call dsl_deadlist_insert() now because it may block 310 * waiting for I/O. Instead, put bp on the deferred 311 * queue and let dsl_pool_sync() finish the job. 312 */ 313 bplist_append(&ds->ds_pending_deadlist, bp); 314 } else { 315 dsl_deadlist_insert(&ds->ds_deadlist, bp, B_FALSE, tx); 316 } 317 ASSERT3U(ds->ds_prev->ds_object, ==, 318 dsl_dataset_phys(ds)->ds_prev_snap_obj); 319 ASSERT(dsl_dataset_phys(ds->ds_prev)->ds_num_children > 0); 320 /* if (bp->blk_birth > prev prev snap txg) prev unique += bs */ 321 if (dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj == 322 ds->ds_object && bp->blk_birth > 323 dsl_dataset_phys(ds->ds_prev)->ds_prev_snap_txg) { 324 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); 325 mutex_enter(&ds->ds_prev->ds_lock); 326 dsl_dataset_phys(ds->ds_prev)->ds_unique_bytes += used; 327 mutex_exit(&ds->ds_prev->ds_lock); 328 } 329 if (bp->blk_birth > ds->ds_dir->dd_origin_txg) { 330 dsl_dir_transfer_space(ds->ds_dir, used, 331 DD_USED_HEAD, DD_USED_SNAP, tx); 332 } 333 } 334 335 dsl_bookmark_block_killed(ds, bp, tx); 336 337 mutex_enter(&ds->ds_lock); 338 ASSERT3U(dsl_dataset_phys(ds)->ds_referenced_bytes, >=, used); 339 dsl_dataset_phys(ds)->ds_referenced_bytes -= used; 340 ASSERT3U(dsl_dataset_phys(ds)->ds_compressed_bytes, >=, compressed); 341 dsl_dataset_phys(ds)->ds_compressed_bytes -= compressed; 342 ASSERT3U(dsl_dataset_phys(ds)->ds_uncompressed_bytes, >=, uncompressed); 343 dsl_dataset_phys(ds)->ds_uncompressed_bytes -= uncompressed; 344 mutex_exit(&ds->ds_lock); 345 346 return (used); 347 } 348 349 struct feature_type_uint64_array_arg { 350 uint64_t length; 351 uint64_t *array; 352 }; 353 354 static void 355 unload_zfeature(dsl_dataset_t *ds, spa_feature_t f) 356 { 357 switch (spa_feature_table[f].fi_type) { 358 case ZFEATURE_TYPE_BOOLEAN: 359 break; 360 case ZFEATURE_TYPE_UINT64_ARRAY: 361 { 362 struct feature_type_uint64_array_arg *ftuaa = ds->ds_feature[f]; 363 kmem_free(ftuaa->array, ftuaa->length * sizeof (uint64_t)); 364 kmem_free(ftuaa, sizeof (*ftuaa)); 365 break; 366 } 367 default: 368 panic("Invalid zfeature type %d", spa_feature_table[f].fi_type); 369 } 370 } 371 372 static int 373 load_zfeature(objset_t *mos, dsl_dataset_t *ds, spa_feature_t f) 374 { 375 int err = 0; 376 switch (spa_feature_table[f].fi_type) { 377 case ZFEATURE_TYPE_BOOLEAN: 378 err = zap_contains(mos, ds->ds_object, 379 spa_feature_table[f].fi_guid); 380 if (err == 0) { 381 ds->ds_feature[f] = (void *)B_TRUE; 382 } else { 383 ASSERT3U(err, ==, ENOENT); 384 err = 0; 385 } 386 break; 387 case ZFEATURE_TYPE_UINT64_ARRAY: 388 { 389 uint64_t int_size, num_int; 390 uint64_t *data; 391 err = zap_length(mos, ds->ds_object, 392 spa_feature_table[f].fi_guid, &int_size, &num_int); 393 if (err != 0) { 394 ASSERT3U(err, ==, ENOENT); 395 err = 0; 396 break; 397 } 398 ASSERT3U(int_size, ==, sizeof (uint64_t)); 399 data = kmem_alloc(int_size * num_int, KM_SLEEP); 400 VERIFY0(zap_lookup(mos, ds->ds_object, 401 spa_feature_table[f].fi_guid, int_size, num_int, data)); 402 struct feature_type_uint64_array_arg *ftuaa = 403 kmem_alloc(sizeof (*ftuaa), KM_SLEEP); 404 ftuaa->length = num_int; 405 ftuaa->array = data; 406 ds->ds_feature[f] = ftuaa; 407 break; 408 } 409 default: 410 panic("Invalid zfeature type %d", spa_feature_table[f].fi_type); 411 } 412 return (err); 413 } 414 415 /* 416 * We have to release the fsid synchronously or we risk that a subsequent 417 * mount of the same dataset will fail to unique_insert the fsid. This 418 * failure would manifest itself as the fsid of this dataset changing 419 * between mounts which makes NFS clients quite unhappy. 420 */ 421 static void 422 dsl_dataset_evict_sync(void *dbu) 423 { 424 dsl_dataset_t *ds = dbu; 425 426 ASSERT(ds->ds_owner == NULL); 427 428 unique_remove(ds->ds_fsid_guid); 429 } 430 431 static void 432 dsl_dataset_evict_async(void *dbu) 433 { 434 dsl_dataset_t *ds = dbu; 435 436 ASSERT(ds->ds_owner == NULL); 437 438 ds->ds_dbuf = NULL; 439 440 if (ds->ds_objset != NULL) 441 dmu_objset_evict(ds->ds_objset); 442 443 if (ds->ds_prev) { 444 dsl_dataset_rele(ds->ds_prev, ds); 445 ds->ds_prev = NULL; 446 } 447 448 dsl_bookmark_fini_ds(ds); 449 450 bplist_destroy(&ds->ds_pending_deadlist); 451 if (dsl_deadlist_is_open(&ds->ds_deadlist)) 452 dsl_deadlist_close(&ds->ds_deadlist); 453 if (dsl_deadlist_is_open(&ds->ds_remap_deadlist)) 454 dsl_deadlist_close(&ds->ds_remap_deadlist); 455 if (ds->ds_dir) 456 dsl_dir_async_rele(ds->ds_dir, ds); 457 458 ASSERT(!list_link_active(&ds->ds_synced_link)); 459 460 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 461 if (dsl_dataset_feature_is_active(ds, f)) 462 unload_zfeature(ds, f); 463 } 464 465 list_destroy(&ds->ds_prop_cbs); 466 mutex_destroy(&ds->ds_lock); 467 mutex_destroy(&ds->ds_opening_lock); 468 mutex_destroy(&ds->ds_sendstream_lock); 469 mutex_destroy(&ds->ds_remap_deadlist_lock); 470 zfs_refcount_destroy(&ds->ds_longholds); 471 rrw_destroy(&ds->ds_bp_rwlock); 472 473 kmem_free(ds, sizeof (dsl_dataset_t)); 474 } 475 476 int 477 dsl_dataset_get_snapname(dsl_dataset_t *ds) 478 { 479 dsl_dataset_phys_t *headphys; 480 int err; 481 dmu_buf_t *headdbuf; 482 dsl_pool_t *dp = ds->ds_dir->dd_pool; 483 objset_t *mos = dp->dp_meta_objset; 484 485 if (ds->ds_snapname[0]) 486 return (0); 487 if (dsl_dataset_phys(ds)->ds_next_snap_obj == 0) 488 return (0); 489 490 err = dmu_bonus_hold(mos, dsl_dir_phys(ds->ds_dir)->dd_head_dataset_obj, 491 FTAG, &headdbuf); 492 if (err != 0) 493 return (err); 494 headphys = headdbuf->db_data; 495 err = zap_value_search(dp->dp_meta_objset, 496 headphys->ds_snapnames_zapobj, ds->ds_object, 0, ds->ds_snapname); 497 if (err != 0 && zfs_recover == B_TRUE) { 498 err = 0; 499 (void) snprintf(ds->ds_snapname, sizeof (ds->ds_snapname), 500 "SNAPOBJ=%llu-ERR=%d", 501 (unsigned long long)ds->ds_object, err); 502 } 503 dmu_buf_rele(headdbuf, FTAG); 504 return (err); 505 } 506 507 int 508 dsl_dataset_snap_lookup(dsl_dataset_t *ds, const char *name, uint64_t *value) 509 { 510 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 511 uint64_t snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj; 512 matchtype_t mt = 0; 513 int err; 514 515 if (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_CI_DATASET) 516 mt = MT_NORMALIZE; 517 518 err = zap_lookup_norm(mos, snapobj, name, 8, 1, 519 value, mt, NULL, 0, NULL); 520 if (err == ENOTSUP && (mt & MT_NORMALIZE)) 521 err = zap_lookup(mos, snapobj, name, 8, 1, value); 522 return (err); 523 } 524 525 int 526 dsl_dataset_snap_remove(dsl_dataset_t *ds, const char *name, dmu_tx_t *tx, 527 boolean_t adj_cnt) 528 { 529 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 530 uint64_t snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj; 531 matchtype_t mt = 0; 532 int err; 533 534 dsl_dir_snap_cmtime_update(ds->ds_dir, tx); 535 536 if (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_CI_DATASET) 537 mt = MT_NORMALIZE; 538 539 err = zap_remove_norm(mos, snapobj, name, mt, tx); 540 if (err == ENOTSUP && (mt & MT_NORMALIZE)) 541 err = zap_remove(mos, snapobj, name, tx); 542 543 if (err == 0 && adj_cnt) 544 dsl_fs_ss_count_adjust(ds->ds_dir, -1, 545 DD_FIELD_SNAPSHOT_COUNT, tx); 546 547 return (err); 548 } 549 550 boolean_t 551 dsl_dataset_try_add_ref(dsl_pool_t *dp, dsl_dataset_t *ds, const void *tag) 552 { 553 dmu_buf_t *dbuf = ds->ds_dbuf; 554 boolean_t result = B_FALSE; 555 556 if (dbuf != NULL && dmu_buf_try_add_ref(dbuf, dp->dp_meta_objset, 557 ds->ds_object, DMU_BONUS_BLKID, tag)) { 558 559 if (ds == dmu_buf_get_user(dbuf)) 560 result = B_TRUE; 561 else 562 dmu_buf_rele(dbuf, tag); 563 } 564 565 return (result); 566 } 567 568 int 569 dsl_dataset_hold_obj(dsl_pool_t *dp, uint64_t dsobj, const void *tag, 570 dsl_dataset_t **dsp) 571 { 572 objset_t *mos = dp->dp_meta_objset; 573 dmu_buf_t *dbuf; 574 dsl_dataset_t *ds; 575 int err; 576 dmu_object_info_t doi; 577 578 ASSERT(dsl_pool_config_held(dp)); 579 580 err = dmu_bonus_hold(mos, dsobj, tag, &dbuf); 581 if (err != 0) 582 return (err); 583 584 /* Make sure dsobj has the correct object type. */ 585 dmu_object_info_from_db(dbuf, &doi); 586 if (doi.doi_bonus_type != DMU_OT_DSL_DATASET) { 587 dmu_buf_rele(dbuf, tag); 588 return (SET_ERROR(EINVAL)); 589 } 590 591 ds = dmu_buf_get_user(dbuf); 592 if (ds == NULL) { 593 dsl_dataset_t *winner = NULL; 594 595 ds = kmem_zalloc(sizeof (dsl_dataset_t), KM_SLEEP); 596 ds->ds_dbuf = dbuf; 597 ds->ds_object = dsobj; 598 ds->ds_is_snapshot = dsl_dataset_phys(ds)->ds_num_children != 0; 599 list_link_init(&ds->ds_synced_link); 600 601 err = dsl_dir_hold_obj(dp, dsl_dataset_phys(ds)->ds_dir_obj, 602 NULL, ds, &ds->ds_dir); 603 if (err != 0) { 604 kmem_free(ds, sizeof (dsl_dataset_t)); 605 dmu_buf_rele(dbuf, tag); 606 return (err); 607 } 608 609 mutex_init(&ds->ds_lock, NULL, MUTEX_DEFAULT, NULL); 610 mutex_init(&ds->ds_opening_lock, NULL, MUTEX_DEFAULT, NULL); 611 mutex_init(&ds->ds_sendstream_lock, NULL, MUTEX_DEFAULT, NULL); 612 mutex_init(&ds->ds_remap_deadlist_lock, 613 NULL, MUTEX_DEFAULT, NULL); 614 rrw_init(&ds->ds_bp_rwlock, B_FALSE); 615 zfs_refcount_create(&ds->ds_longholds); 616 617 bplist_create(&ds->ds_pending_deadlist); 618 619 list_create(&ds->ds_sendstreams, sizeof (dmu_sendstatus_t), 620 offsetof(dmu_sendstatus_t, dss_link)); 621 622 list_create(&ds->ds_prop_cbs, sizeof (dsl_prop_cb_record_t), 623 offsetof(dsl_prop_cb_record_t, cbr_ds_node)); 624 625 if (doi.doi_type == DMU_OTN_ZAP_METADATA) { 626 spa_feature_t f; 627 628 for (f = 0; f < SPA_FEATURES; f++) { 629 if (!(spa_feature_table[f].fi_flags & 630 ZFEATURE_FLAG_PER_DATASET)) 631 continue; 632 err = load_zfeature(mos, ds, f); 633 } 634 } 635 636 if (!ds->ds_is_snapshot) { 637 ds->ds_snapname[0] = '\0'; 638 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) { 639 err = dsl_dataset_hold_obj(dp, 640 dsl_dataset_phys(ds)->ds_prev_snap_obj, 641 ds, &ds->ds_prev); 642 } 643 if (err != 0) 644 goto after_dsl_bookmark_fini; 645 err = dsl_bookmark_init_ds(ds); 646 } else { 647 if (zfs_flags & ZFS_DEBUG_SNAPNAMES) 648 err = dsl_dataset_get_snapname(ds); 649 if (err == 0 && 650 dsl_dataset_phys(ds)->ds_userrefs_obj != 0) { 651 err = zap_count( 652 ds->ds_dir->dd_pool->dp_meta_objset, 653 dsl_dataset_phys(ds)->ds_userrefs_obj, 654 &ds->ds_userrefs); 655 } 656 } 657 658 if (err == 0 && !ds->ds_is_snapshot) { 659 err = dsl_prop_get_int_ds(ds, 660 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 661 &ds->ds_reserved); 662 if (err == 0) { 663 err = dsl_prop_get_int_ds(ds, 664 zfs_prop_to_name(ZFS_PROP_REFQUOTA), 665 &ds->ds_quota); 666 } 667 } else { 668 ds->ds_reserved = ds->ds_quota = 0; 669 } 670 671 if (err == 0 && ds->ds_dir->dd_crypto_obj != 0 && 672 ds->ds_is_snapshot && 673 zap_contains(mos, dsobj, DS_FIELD_IVSET_GUID) != 0) { 674 dp->dp_spa->spa_errata = 675 ZPOOL_ERRATA_ZOL_8308_ENCRYPTION; 676 } 677 678 dsl_deadlist_open(&ds->ds_deadlist, 679 mos, dsl_dataset_phys(ds)->ds_deadlist_obj); 680 uint64_t remap_deadlist_obj = 681 dsl_dataset_get_remap_deadlist_object(ds); 682 if (remap_deadlist_obj != 0) { 683 dsl_deadlist_open(&ds->ds_remap_deadlist, mos, 684 remap_deadlist_obj); 685 } 686 687 dmu_buf_init_user(&ds->ds_dbu, dsl_dataset_evict_sync, 688 dsl_dataset_evict_async, &ds->ds_dbuf); 689 if (err == 0) 690 winner = dmu_buf_set_user_ie(dbuf, &ds->ds_dbu); 691 692 if (err != 0 || winner != NULL) { 693 dsl_deadlist_close(&ds->ds_deadlist); 694 if (dsl_deadlist_is_open(&ds->ds_remap_deadlist)) 695 dsl_deadlist_close(&ds->ds_remap_deadlist); 696 dsl_bookmark_fini_ds(ds); 697 after_dsl_bookmark_fini: 698 if (ds->ds_prev) 699 dsl_dataset_rele(ds->ds_prev, ds); 700 dsl_dir_rele(ds->ds_dir, ds); 701 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 702 if (dsl_dataset_feature_is_active(ds, f)) 703 unload_zfeature(ds, f); 704 } 705 706 list_destroy(&ds->ds_prop_cbs); 707 list_destroy(&ds->ds_sendstreams); 708 bplist_destroy(&ds->ds_pending_deadlist); 709 mutex_destroy(&ds->ds_lock); 710 mutex_destroy(&ds->ds_opening_lock); 711 mutex_destroy(&ds->ds_sendstream_lock); 712 mutex_destroy(&ds->ds_remap_deadlist_lock); 713 zfs_refcount_destroy(&ds->ds_longholds); 714 rrw_destroy(&ds->ds_bp_rwlock); 715 kmem_free(ds, sizeof (dsl_dataset_t)); 716 if (err != 0) { 717 dmu_buf_rele(dbuf, tag); 718 return (err); 719 } 720 ds = winner; 721 } else { 722 ds->ds_fsid_guid = 723 unique_insert(dsl_dataset_phys(ds)->ds_fsid_guid); 724 if (ds->ds_fsid_guid != 725 dsl_dataset_phys(ds)->ds_fsid_guid) { 726 zfs_dbgmsg("ds_fsid_guid changed from " 727 "%llx to %llx for pool %s dataset id %llu", 728 (long long) 729 dsl_dataset_phys(ds)->ds_fsid_guid, 730 (long long)ds->ds_fsid_guid, 731 spa_name(dp->dp_spa), 732 (u_longlong_t)dsobj); 733 } 734 } 735 } 736 737 ASSERT3P(ds->ds_dbuf, ==, dbuf); 738 ASSERT3P(dsl_dataset_phys(ds), ==, dbuf->db_data); 739 ASSERT(dsl_dataset_phys(ds)->ds_prev_snap_obj != 0 || 740 spa_version(dp->dp_spa) < SPA_VERSION_ORIGIN || 741 dp->dp_origin_snap == NULL || ds == dp->dp_origin_snap); 742 *dsp = ds; 743 744 return (0); 745 } 746 747 int 748 dsl_dataset_create_key_mapping(dsl_dataset_t *ds) 749 { 750 dsl_dir_t *dd = ds->ds_dir; 751 752 if (dd->dd_crypto_obj == 0) 753 return (0); 754 755 return (spa_keystore_create_mapping(dd->dd_pool->dp_spa, 756 ds, ds, &ds->ds_key_mapping)); 757 } 758 759 int 760 dsl_dataset_hold_obj_flags(dsl_pool_t *dp, uint64_t dsobj, 761 ds_hold_flags_t flags, const void *tag, dsl_dataset_t **dsp) 762 { 763 int err; 764 765 err = dsl_dataset_hold_obj(dp, dsobj, tag, dsp); 766 if (err != 0) 767 return (err); 768 769 ASSERT3P(*dsp, !=, NULL); 770 771 if (flags & DS_HOLD_FLAG_DECRYPT) { 772 err = dsl_dataset_create_key_mapping(*dsp); 773 if (err != 0) 774 dsl_dataset_rele(*dsp, tag); 775 } 776 777 return (err); 778 } 779 780 int 781 dsl_dataset_hold_flags(dsl_pool_t *dp, const char *name, ds_hold_flags_t flags, 782 const void *tag, dsl_dataset_t **dsp) 783 { 784 dsl_dir_t *dd; 785 const char *snapname; 786 uint64_t obj; 787 int err = 0; 788 dsl_dataset_t *ds; 789 790 err = dsl_dir_hold(dp, name, FTAG, &dd, &snapname); 791 if (err != 0) 792 return (err); 793 794 ASSERT(dsl_pool_config_held(dp)); 795 obj = dsl_dir_phys(dd)->dd_head_dataset_obj; 796 if (obj != 0) 797 err = dsl_dataset_hold_obj_flags(dp, obj, flags, tag, &ds); 798 else 799 err = SET_ERROR(ENOENT); 800 801 /* we may be looking for a snapshot */ 802 if (err == 0 && snapname != NULL) { 803 dsl_dataset_t *snap_ds; 804 805 if (*snapname++ != '@') { 806 dsl_dataset_rele_flags(ds, flags, tag); 807 dsl_dir_rele(dd, FTAG); 808 return (SET_ERROR(ENOENT)); 809 } 810 811 dprintf("looking for snapshot '%s'\n", snapname); 812 err = dsl_dataset_snap_lookup(ds, snapname, &obj); 813 if (err == 0) { 814 err = dsl_dataset_hold_obj_flags(dp, obj, flags, tag, 815 &snap_ds); 816 } 817 dsl_dataset_rele_flags(ds, flags, tag); 818 819 if (err == 0) { 820 mutex_enter(&snap_ds->ds_lock); 821 if (snap_ds->ds_snapname[0] == 0) 822 (void) strlcpy(snap_ds->ds_snapname, snapname, 823 sizeof (snap_ds->ds_snapname)); 824 mutex_exit(&snap_ds->ds_lock); 825 ds = snap_ds; 826 } 827 } 828 if (err == 0) 829 *dsp = ds; 830 dsl_dir_rele(dd, FTAG); 831 return (err); 832 } 833 834 int 835 dsl_dataset_hold(dsl_pool_t *dp, const char *name, const void *tag, 836 dsl_dataset_t **dsp) 837 { 838 return (dsl_dataset_hold_flags(dp, name, 0, tag, dsp)); 839 } 840 841 static int 842 dsl_dataset_own_obj_impl(dsl_pool_t *dp, uint64_t dsobj, ds_hold_flags_t flags, 843 const void *tag, boolean_t override, dsl_dataset_t **dsp) 844 { 845 int err = dsl_dataset_hold_obj_flags(dp, dsobj, flags, tag, dsp); 846 if (err != 0) 847 return (err); 848 if (!dsl_dataset_tryown(*dsp, tag, override)) { 849 dsl_dataset_rele_flags(*dsp, flags, tag); 850 *dsp = NULL; 851 return (SET_ERROR(EBUSY)); 852 } 853 return (0); 854 } 855 856 857 int 858 dsl_dataset_own_obj(dsl_pool_t *dp, uint64_t dsobj, ds_hold_flags_t flags, 859 const void *tag, dsl_dataset_t **dsp) 860 { 861 return (dsl_dataset_own_obj_impl(dp, dsobj, flags, tag, B_FALSE, dsp)); 862 } 863 864 int 865 dsl_dataset_own_obj_force(dsl_pool_t *dp, uint64_t dsobj, 866 ds_hold_flags_t flags, const void *tag, dsl_dataset_t **dsp) 867 { 868 return (dsl_dataset_own_obj_impl(dp, dsobj, flags, tag, B_TRUE, dsp)); 869 } 870 871 static int 872 dsl_dataset_own_impl(dsl_pool_t *dp, const char *name, ds_hold_flags_t flags, 873 const void *tag, boolean_t override, dsl_dataset_t **dsp) 874 { 875 int err = dsl_dataset_hold_flags(dp, name, flags, tag, dsp); 876 if (err != 0) 877 return (err); 878 if (!dsl_dataset_tryown(*dsp, tag, override)) { 879 dsl_dataset_rele_flags(*dsp, flags, tag); 880 return (SET_ERROR(EBUSY)); 881 } 882 return (0); 883 } 884 885 int 886 dsl_dataset_own_force(dsl_pool_t *dp, const char *name, ds_hold_flags_t flags, 887 const void *tag, dsl_dataset_t **dsp) 888 { 889 return (dsl_dataset_own_impl(dp, name, flags, tag, B_TRUE, dsp)); 890 } 891 892 int 893 dsl_dataset_own(dsl_pool_t *dp, const char *name, ds_hold_flags_t flags, 894 const void *tag, dsl_dataset_t **dsp) 895 { 896 return (dsl_dataset_own_impl(dp, name, flags, tag, B_FALSE, dsp)); 897 } 898 899 /* 900 * See the comment above dsl_pool_hold() for details. In summary, a long 901 * hold is used to prevent destruction of a dataset while the pool hold 902 * is dropped, allowing other concurrent operations (e.g. spa_sync()). 903 * 904 * The dataset and pool must be held when this function is called. After it 905 * is called, the pool hold may be released while the dataset is still held 906 * and accessed. 907 */ 908 void 909 dsl_dataset_long_hold(dsl_dataset_t *ds, const void *tag) 910 { 911 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool)); 912 (void) zfs_refcount_add(&ds->ds_longholds, tag); 913 } 914 915 void 916 dsl_dataset_long_rele(dsl_dataset_t *ds, const void *tag) 917 { 918 (void) zfs_refcount_remove(&ds->ds_longholds, tag); 919 } 920 921 /* Return B_TRUE if there are any long holds on this dataset. */ 922 boolean_t 923 dsl_dataset_long_held(dsl_dataset_t *ds) 924 { 925 return (!zfs_refcount_is_zero(&ds->ds_longholds)); 926 } 927 928 void 929 dsl_dataset_name(dsl_dataset_t *ds, char *name) 930 { 931 if (ds == NULL) { 932 (void) strlcpy(name, "mos", ZFS_MAX_DATASET_NAME_LEN); 933 } else { 934 dsl_dir_name(ds->ds_dir, name); 935 VERIFY0(dsl_dataset_get_snapname(ds)); 936 if (ds->ds_snapname[0]) { 937 VERIFY3U(strlcat(name, "@", ZFS_MAX_DATASET_NAME_LEN), 938 <, ZFS_MAX_DATASET_NAME_LEN); 939 /* 940 * We use a "recursive" mutex so that we 941 * can call dprintf_ds() with ds_lock held. 942 */ 943 if (!MUTEX_HELD(&ds->ds_lock)) { 944 mutex_enter(&ds->ds_lock); 945 VERIFY3U(strlcat(name, ds->ds_snapname, 946 ZFS_MAX_DATASET_NAME_LEN), <, 947 ZFS_MAX_DATASET_NAME_LEN); 948 mutex_exit(&ds->ds_lock); 949 } else { 950 VERIFY3U(strlcat(name, ds->ds_snapname, 951 ZFS_MAX_DATASET_NAME_LEN), <, 952 ZFS_MAX_DATASET_NAME_LEN); 953 } 954 } 955 } 956 } 957 958 int 959 dsl_dataset_namelen(dsl_dataset_t *ds) 960 { 961 VERIFY0(dsl_dataset_get_snapname(ds)); 962 mutex_enter(&ds->ds_lock); 963 int len = strlen(ds->ds_snapname); 964 mutex_exit(&ds->ds_lock); 965 /* add '@' if ds is a snap */ 966 if (len > 0) 967 len++; 968 len += dsl_dir_namelen(ds->ds_dir); 969 return (len); 970 } 971 972 void 973 dsl_dataset_rele(dsl_dataset_t *ds, const void *tag) 974 { 975 dmu_buf_rele(ds->ds_dbuf, tag); 976 } 977 978 void 979 dsl_dataset_remove_key_mapping(dsl_dataset_t *ds) 980 { 981 dsl_dir_t *dd = ds->ds_dir; 982 983 if (dd == NULL || dd->dd_crypto_obj == 0) 984 return; 985 986 (void) spa_keystore_remove_mapping(dd->dd_pool->dp_spa, 987 ds->ds_object, ds); 988 } 989 990 void 991 dsl_dataset_rele_flags(dsl_dataset_t *ds, ds_hold_flags_t flags, 992 const void *tag) 993 { 994 if (flags & DS_HOLD_FLAG_DECRYPT) 995 dsl_dataset_remove_key_mapping(ds); 996 997 dsl_dataset_rele(ds, tag); 998 } 999 1000 void 1001 dsl_dataset_disown(dsl_dataset_t *ds, ds_hold_flags_t flags, const void *tag) 1002 { 1003 ASSERT3P(ds->ds_owner, ==, tag); 1004 ASSERT(ds->ds_dbuf != NULL); 1005 1006 mutex_enter(&ds->ds_lock); 1007 ds->ds_owner = NULL; 1008 mutex_exit(&ds->ds_lock); 1009 dsl_dataset_long_rele(ds, tag); 1010 dsl_dataset_rele_flags(ds, flags, tag); 1011 } 1012 1013 boolean_t 1014 dsl_dataset_tryown(dsl_dataset_t *ds, const void *tag, boolean_t override) 1015 { 1016 boolean_t gotit = FALSE; 1017 1018 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool)); 1019 mutex_enter(&ds->ds_lock); 1020 if (ds->ds_owner == NULL && (override || !(DS_IS_INCONSISTENT(ds) || 1021 (dsl_dataset_feature_is_active(ds, 1022 SPA_FEATURE_REDACTED_DATASETS) && 1023 !zfs_allow_redacted_dataset_mount)))) { 1024 ds->ds_owner = tag; 1025 dsl_dataset_long_hold(ds, tag); 1026 gotit = TRUE; 1027 } 1028 mutex_exit(&ds->ds_lock); 1029 return (gotit); 1030 } 1031 1032 boolean_t 1033 dsl_dataset_has_owner(dsl_dataset_t *ds) 1034 { 1035 boolean_t rv; 1036 mutex_enter(&ds->ds_lock); 1037 rv = (ds->ds_owner != NULL); 1038 mutex_exit(&ds->ds_lock); 1039 return (rv); 1040 } 1041 1042 static boolean_t 1043 zfeature_active(spa_feature_t f, void *arg) 1044 { 1045 switch (spa_feature_table[f].fi_type) { 1046 case ZFEATURE_TYPE_BOOLEAN: { 1047 boolean_t val = (boolean_t)(uintptr_t)arg; 1048 ASSERT(val == B_FALSE || val == B_TRUE); 1049 return (val); 1050 } 1051 case ZFEATURE_TYPE_UINT64_ARRAY: 1052 /* 1053 * In this case, arg is a uint64_t array. The feature is active 1054 * if the array is non-null. 1055 */ 1056 return (arg != NULL); 1057 default: 1058 panic("Invalid zfeature type %d", spa_feature_table[f].fi_type); 1059 return (B_FALSE); 1060 } 1061 } 1062 1063 boolean_t 1064 dsl_dataset_feature_is_active(dsl_dataset_t *ds, spa_feature_t f) 1065 { 1066 return (zfeature_active(f, ds->ds_feature[f])); 1067 } 1068 1069 /* 1070 * The buffers passed out by this function are references to internal buffers; 1071 * they should not be freed by callers of this function, and they should not be 1072 * used after the dataset has been released. 1073 */ 1074 boolean_t 1075 dsl_dataset_get_uint64_array_feature(dsl_dataset_t *ds, spa_feature_t f, 1076 uint64_t *outlength, uint64_t **outp) 1077 { 1078 VERIFY(spa_feature_table[f].fi_type & ZFEATURE_TYPE_UINT64_ARRAY); 1079 if (!dsl_dataset_feature_is_active(ds, f)) { 1080 return (B_FALSE); 1081 } 1082 struct feature_type_uint64_array_arg *ftuaa = ds->ds_feature[f]; 1083 *outp = ftuaa->array; 1084 *outlength = ftuaa->length; 1085 return (B_TRUE); 1086 } 1087 1088 void 1089 dsl_dataset_activate_feature(uint64_t dsobj, spa_feature_t f, void *arg, 1090 dmu_tx_t *tx) 1091 { 1092 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 1093 objset_t *mos = dmu_tx_pool(tx)->dp_meta_objset; 1094 uint64_t zero = 0; 1095 1096 VERIFY(spa_feature_table[f].fi_flags & ZFEATURE_FLAG_PER_DATASET); 1097 1098 spa_feature_incr(spa, f, tx); 1099 dmu_object_zapify(mos, dsobj, DMU_OT_DSL_DATASET, tx); 1100 1101 switch (spa_feature_table[f].fi_type) { 1102 case ZFEATURE_TYPE_BOOLEAN: 1103 ASSERT3S((boolean_t)(uintptr_t)arg, ==, B_TRUE); 1104 VERIFY0(zap_add(mos, dsobj, spa_feature_table[f].fi_guid, 1105 sizeof (zero), 1, &zero, tx)); 1106 break; 1107 case ZFEATURE_TYPE_UINT64_ARRAY: 1108 { 1109 struct feature_type_uint64_array_arg *ftuaa = arg; 1110 VERIFY0(zap_add(mos, dsobj, spa_feature_table[f].fi_guid, 1111 sizeof (uint64_t), ftuaa->length, ftuaa->array, tx)); 1112 break; 1113 } 1114 default: 1115 panic("Invalid zfeature type %d", spa_feature_table[f].fi_type); 1116 } 1117 } 1118 1119 static void 1120 dsl_dataset_deactivate_feature_impl(dsl_dataset_t *ds, spa_feature_t f, 1121 dmu_tx_t *tx) 1122 { 1123 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 1124 objset_t *mos = dmu_tx_pool(tx)->dp_meta_objset; 1125 uint64_t dsobj = ds->ds_object; 1126 1127 VERIFY(spa_feature_table[f].fi_flags & ZFEATURE_FLAG_PER_DATASET); 1128 1129 VERIFY0(zap_remove(mos, dsobj, spa_feature_table[f].fi_guid, tx)); 1130 spa_feature_decr(spa, f, tx); 1131 ds->ds_feature[f] = NULL; 1132 } 1133 1134 void 1135 dsl_dataset_deactivate_feature(dsl_dataset_t *ds, spa_feature_t f, dmu_tx_t *tx) 1136 { 1137 unload_zfeature(ds, f); 1138 dsl_dataset_deactivate_feature_impl(ds, f, tx); 1139 } 1140 1141 uint64_t 1142 dsl_dataset_create_sync_dd(dsl_dir_t *dd, dsl_dataset_t *origin, 1143 dsl_crypto_params_t *dcp, uint64_t flags, dmu_tx_t *tx) 1144 { 1145 dsl_pool_t *dp = dd->dd_pool; 1146 dmu_buf_t *dbuf; 1147 dsl_dataset_phys_t *dsphys; 1148 uint64_t dsobj; 1149 objset_t *mos = dp->dp_meta_objset; 1150 1151 if (origin == NULL) 1152 origin = dp->dp_origin_snap; 1153 1154 ASSERT(origin == NULL || origin->ds_dir->dd_pool == dp); 1155 ASSERT(origin == NULL || dsl_dataset_phys(origin)->ds_num_children > 0); 1156 ASSERT(dmu_tx_is_syncing(tx)); 1157 ASSERT(dsl_dir_phys(dd)->dd_head_dataset_obj == 0); 1158 1159 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, 1160 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); 1161 VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); 1162 dmu_buf_will_dirty(dbuf, tx); 1163 dsphys = dbuf->db_data; 1164 memset(dsphys, 0, sizeof (dsl_dataset_phys_t)); 1165 dsphys->ds_dir_obj = dd->dd_object; 1166 dsphys->ds_flags = flags; 1167 dsphys->ds_fsid_guid = unique_create(); 1168 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, 1169 sizeof (dsphys->ds_guid)); 1170 dsphys->ds_snapnames_zapobj = 1171 zap_create_norm(mos, U8_TEXTPREP_TOUPPER, DMU_OT_DSL_DS_SNAP_MAP, 1172 DMU_OT_NONE, 0, tx); 1173 dsphys->ds_creation_time = gethrestime_sec(); 1174 dsphys->ds_creation_txg = tx->tx_txg == TXG_INITIAL ? 1 : tx->tx_txg; 1175 1176 if (origin == NULL) { 1177 dsphys->ds_deadlist_obj = dsl_deadlist_alloc(mos, tx); 1178 } else { 1179 dsl_dataset_t *ohds; /* head of the origin snapshot */ 1180 1181 dsphys->ds_prev_snap_obj = origin->ds_object; 1182 dsphys->ds_prev_snap_txg = 1183 dsl_dataset_phys(origin)->ds_creation_txg; 1184 dsphys->ds_referenced_bytes = 1185 dsl_dataset_phys(origin)->ds_referenced_bytes; 1186 dsphys->ds_compressed_bytes = 1187 dsl_dataset_phys(origin)->ds_compressed_bytes; 1188 dsphys->ds_uncompressed_bytes = 1189 dsl_dataset_phys(origin)->ds_uncompressed_bytes; 1190 rrw_enter(&origin->ds_bp_rwlock, RW_READER, FTAG); 1191 dsphys->ds_bp = dsl_dataset_phys(origin)->ds_bp; 1192 rrw_exit(&origin->ds_bp_rwlock, FTAG); 1193 1194 /* 1195 * Inherit flags that describe the dataset's contents 1196 * (INCONSISTENT) or properties (Case Insensitive). 1197 */ 1198 dsphys->ds_flags |= dsl_dataset_phys(origin)->ds_flags & 1199 (DS_FLAG_INCONSISTENT | DS_FLAG_CI_DATASET); 1200 1201 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 1202 if (zfeature_active(f, origin->ds_feature[f])) { 1203 dsl_dataset_activate_feature(dsobj, f, 1204 origin->ds_feature[f], tx); 1205 } 1206 } 1207 1208 dmu_buf_will_dirty(origin->ds_dbuf, tx); 1209 dsl_dataset_phys(origin)->ds_num_children++; 1210 1211 VERIFY0(dsl_dataset_hold_obj(dp, 1212 dsl_dir_phys(origin->ds_dir)->dd_head_dataset_obj, 1213 FTAG, &ohds)); 1214 dsphys->ds_deadlist_obj = dsl_deadlist_clone(&ohds->ds_deadlist, 1215 dsphys->ds_prev_snap_txg, dsphys->ds_prev_snap_obj, tx); 1216 dsl_dataset_rele(ohds, FTAG); 1217 1218 if (spa_version(dp->dp_spa) >= SPA_VERSION_NEXT_CLONES) { 1219 if (dsl_dataset_phys(origin)->ds_next_clones_obj == 0) { 1220 dsl_dataset_phys(origin)->ds_next_clones_obj = 1221 zap_create(mos, 1222 DMU_OT_NEXT_CLONES, DMU_OT_NONE, 0, tx); 1223 } 1224 VERIFY0(zap_add_int(mos, 1225 dsl_dataset_phys(origin)->ds_next_clones_obj, 1226 dsobj, tx)); 1227 } 1228 1229 dmu_buf_will_dirty(dd->dd_dbuf, tx); 1230 dsl_dir_phys(dd)->dd_origin_obj = origin->ds_object; 1231 if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 1232 if (dsl_dir_phys(origin->ds_dir)->dd_clones == 0) { 1233 dmu_buf_will_dirty(origin->ds_dir->dd_dbuf, tx); 1234 dsl_dir_phys(origin->ds_dir)->dd_clones = 1235 zap_create(mos, 1236 DMU_OT_DSL_CLONES, DMU_OT_NONE, 0, tx); 1237 } 1238 VERIFY0(zap_add_int(mos, 1239 dsl_dir_phys(origin->ds_dir)->dd_clones, 1240 dsobj, tx)); 1241 } 1242 } 1243 1244 /* handle encryption */ 1245 dsl_dataset_create_crypt_sync(dsobj, dd, origin, dcp, tx); 1246 1247 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE) 1248 dsphys->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 1249 1250 dmu_buf_rele(dbuf, FTAG); 1251 1252 dmu_buf_will_dirty(dd->dd_dbuf, tx); 1253 dsl_dir_phys(dd)->dd_head_dataset_obj = dsobj; 1254 1255 return (dsobj); 1256 } 1257 1258 static void 1259 dsl_dataset_zero_zil(dsl_dataset_t *ds, dmu_tx_t *tx) 1260 { 1261 objset_t *os; 1262 1263 VERIFY0(dmu_objset_from_ds(ds, &os)); 1264 if (memcmp(&os->os_zil_header, &zero_zil, sizeof (zero_zil)) != 0) { 1265 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1266 zio_t *zio; 1267 1268 memset(&os->os_zil_header, 0, sizeof (os->os_zil_header)); 1269 if (os->os_encrypted) 1270 os->os_next_write_raw[tx->tx_txg & TXG_MASK] = B_TRUE; 1271 1272 zio = zio_root(dp->dp_spa, NULL, NULL, ZIO_FLAG_MUSTSUCCEED); 1273 dsl_dataset_sync(ds, zio, tx); 1274 VERIFY0(zio_wait(zio)); 1275 1276 /* dsl_dataset_sync_done will drop this reference. */ 1277 dmu_buf_add_ref(ds->ds_dbuf, ds); 1278 dsl_dataset_sync_done(ds, tx); 1279 } 1280 } 1281 1282 uint64_t 1283 dsl_dataset_create_sync(dsl_dir_t *pdd, const char *lastname, 1284 dsl_dataset_t *origin, uint64_t flags, cred_t *cr, 1285 dsl_crypto_params_t *dcp, dmu_tx_t *tx) 1286 { 1287 dsl_pool_t *dp = pdd->dd_pool; 1288 uint64_t dsobj, ddobj; 1289 dsl_dir_t *dd; 1290 1291 ASSERT(dmu_tx_is_syncing(tx)); 1292 ASSERT(lastname[0] != '@'); 1293 /* 1294 * Filesystems will eventually have their origin set to dp_origin_snap, 1295 * but that's taken care of in dsl_dataset_create_sync_dd. When 1296 * creating a filesystem, this function is called with origin equal to 1297 * NULL. 1298 */ 1299 if (origin != NULL) 1300 ASSERT3P(origin, !=, dp->dp_origin_snap); 1301 1302 ddobj = dsl_dir_create_sync(dp, pdd, lastname, tx); 1303 VERIFY0(dsl_dir_hold_obj(dp, ddobj, lastname, FTAG, &dd)); 1304 1305 dsobj = dsl_dataset_create_sync_dd(dd, origin, dcp, 1306 flags & ~DS_CREATE_FLAG_NODIRTY, tx); 1307 1308 dsl_deleg_set_create_perms(dd, tx, cr); 1309 1310 /* 1311 * If we are creating a clone and the livelist feature is enabled, 1312 * add the entry DD_FIELD_LIVELIST to ZAP. 1313 */ 1314 if (origin != NULL && 1315 spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_LIVELIST)) { 1316 objset_t *mos = dd->dd_pool->dp_meta_objset; 1317 dsl_dir_zapify(dd, tx); 1318 uint64_t obj = dsl_deadlist_alloc(mos, tx); 1319 VERIFY0(zap_add(mos, dd->dd_object, DD_FIELD_LIVELIST, 1320 sizeof (uint64_t), 1, &obj, tx)); 1321 spa_feature_incr(dp->dp_spa, SPA_FEATURE_LIVELIST, tx); 1322 } 1323 1324 /* 1325 * Since we're creating a new node we know it's a leaf, so we can 1326 * initialize the counts if the limit feature is active. 1327 */ 1328 if (spa_feature_is_active(dp->dp_spa, SPA_FEATURE_FS_SS_LIMIT)) { 1329 uint64_t cnt = 0; 1330 objset_t *os = dd->dd_pool->dp_meta_objset; 1331 1332 dsl_dir_zapify(dd, tx); 1333 VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_FILESYSTEM_COUNT, 1334 sizeof (cnt), 1, &cnt, tx)); 1335 VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_SNAPSHOT_COUNT, 1336 sizeof (cnt), 1, &cnt, tx)); 1337 } 1338 1339 dsl_dir_rele(dd, FTAG); 1340 1341 /* 1342 * If we are creating a clone, make sure we zero out any stale 1343 * data from the origin snapshots zil header. 1344 */ 1345 if (origin != NULL && !(flags & DS_CREATE_FLAG_NODIRTY)) { 1346 dsl_dataset_t *ds; 1347 1348 VERIFY0(dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds)); 1349 dsl_dataset_zero_zil(ds, tx); 1350 dsl_dataset_rele(ds, FTAG); 1351 } 1352 1353 return (dsobj); 1354 } 1355 1356 /* 1357 * The unique space in the head dataset can be calculated by subtracting 1358 * the space used in the most recent snapshot, that is still being used 1359 * in this file system, from the space currently in use. To figure out 1360 * the space in the most recent snapshot still in use, we need to take 1361 * the total space used in the snapshot and subtract out the space that 1362 * has been freed up since the snapshot was taken. 1363 */ 1364 void 1365 dsl_dataset_recalc_head_uniq(dsl_dataset_t *ds) 1366 { 1367 uint64_t mrs_used; 1368 uint64_t dlused, dlcomp, dluncomp; 1369 1370 ASSERT(!ds->ds_is_snapshot); 1371 1372 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) 1373 mrs_used = dsl_dataset_phys(ds->ds_prev)->ds_referenced_bytes; 1374 else 1375 mrs_used = 0; 1376 1377 dsl_deadlist_space(&ds->ds_deadlist, &dlused, &dlcomp, &dluncomp); 1378 1379 ASSERT3U(dlused, <=, mrs_used); 1380 dsl_dataset_phys(ds)->ds_unique_bytes = 1381 dsl_dataset_phys(ds)->ds_referenced_bytes - (mrs_used - dlused); 1382 1383 if (spa_version(ds->ds_dir->dd_pool->dp_spa) >= 1384 SPA_VERSION_UNIQUE_ACCURATE) 1385 dsl_dataset_phys(ds)->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 1386 } 1387 1388 void 1389 dsl_dataset_remove_from_next_clones(dsl_dataset_t *ds, uint64_t obj, 1390 dmu_tx_t *tx) 1391 { 1392 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 1393 uint64_t count __maybe_unused; 1394 int err; 1395 1396 ASSERT(dsl_dataset_phys(ds)->ds_num_children >= 2); 1397 err = zap_remove_int(mos, dsl_dataset_phys(ds)->ds_next_clones_obj, 1398 obj, tx); 1399 /* 1400 * The err should not be ENOENT, but a bug in a previous version 1401 * of the code could cause upgrade_clones_cb() to not set 1402 * ds_next_snap_obj when it should, leading to a missing entry. 1403 * If we knew that the pool was created after 1404 * SPA_VERSION_NEXT_CLONES, we could assert that it isn't 1405 * ENOENT. However, at least we can check that we don't have 1406 * too many entries in the next_clones_obj even after failing to 1407 * remove this one. 1408 */ 1409 if (err != ENOENT) 1410 VERIFY0(err); 1411 ASSERT0(zap_count(mos, dsl_dataset_phys(ds)->ds_next_clones_obj, 1412 &count)); 1413 ASSERT3U(count, <=, dsl_dataset_phys(ds)->ds_num_children - 2); 1414 } 1415 1416 1417 blkptr_t * 1418 dsl_dataset_get_blkptr(dsl_dataset_t *ds) 1419 { 1420 return (&dsl_dataset_phys(ds)->ds_bp); 1421 } 1422 1423 spa_t * 1424 dsl_dataset_get_spa(dsl_dataset_t *ds) 1425 { 1426 return (ds->ds_dir->dd_pool->dp_spa); 1427 } 1428 1429 void 1430 dsl_dataset_dirty(dsl_dataset_t *ds, dmu_tx_t *tx) 1431 { 1432 dsl_pool_t *dp; 1433 1434 if (ds == NULL) /* this is the meta-objset */ 1435 return; 1436 1437 ASSERT(ds->ds_objset != NULL); 1438 1439 if (dsl_dataset_phys(ds)->ds_next_snap_obj != 0) 1440 panic("dirtying snapshot!"); 1441 1442 /* Must not dirty a dataset in the same txg where it got snapshotted. */ 1443 ASSERT3U(tx->tx_txg, >, dsl_dataset_phys(ds)->ds_prev_snap_txg); 1444 1445 dp = ds->ds_dir->dd_pool; 1446 if (txg_list_add(&dp->dp_dirty_datasets, ds, tx->tx_txg)) { 1447 objset_t *os = ds->ds_objset; 1448 1449 /* up the hold count until we can be written out */ 1450 dmu_buf_add_ref(ds->ds_dbuf, ds); 1451 1452 /* if this dataset is encrypted, grab a reference to the DCK */ 1453 if (ds->ds_dir->dd_crypto_obj != 0 && 1454 !os->os_raw_receive && 1455 !os->os_next_write_raw[tx->tx_txg & TXG_MASK]) { 1456 ASSERT3P(ds->ds_key_mapping, !=, NULL); 1457 key_mapping_add_ref(ds->ds_key_mapping, ds); 1458 } 1459 } 1460 } 1461 1462 static int 1463 dsl_dataset_snapshot_reserve_space(dsl_dataset_t *ds, dmu_tx_t *tx) 1464 { 1465 uint64_t asize; 1466 1467 if (!dmu_tx_is_syncing(tx)) 1468 return (0); 1469 1470 /* 1471 * If there's an fs-only reservation, any blocks that might become 1472 * owned by the snapshot dataset must be accommodated by space 1473 * outside of the reservation. 1474 */ 1475 ASSERT(ds->ds_reserved == 0 || DS_UNIQUE_IS_ACCURATE(ds)); 1476 asize = MIN(dsl_dataset_phys(ds)->ds_unique_bytes, ds->ds_reserved); 1477 if (asize > dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE)) 1478 return (SET_ERROR(ENOSPC)); 1479 1480 /* 1481 * Propagate any reserved space for this snapshot to other 1482 * snapshot checks in this sync group. 1483 */ 1484 if (asize > 0) 1485 dsl_dir_willuse_space(ds->ds_dir, asize, tx); 1486 1487 return (0); 1488 } 1489 1490 int 1491 dsl_dataset_snapshot_check_impl(dsl_dataset_t *ds, const char *snapname, 1492 dmu_tx_t *tx, boolean_t recv, uint64_t cnt, cred_t *cr, proc_t *proc) 1493 { 1494 int error; 1495 uint64_t value; 1496 1497 ds->ds_trysnap_txg = tx->tx_txg; 1498 1499 if (!dmu_tx_is_syncing(tx)) 1500 return (0); 1501 1502 /* 1503 * We don't allow multiple snapshots of the same txg. If there 1504 * is already one, try again. 1505 */ 1506 if (dsl_dataset_phys(ds)->ds_prev_snap_txg >= tx->tx_txg) 1507 return (SET_ERROR(EAGAIN)); 1508 1509 /* 1510 * Check for conflicting snapshot name. 1511 */ 1512 error = dsl_dataset_snap_lookup(ds, snapname, &value); 1513 if (error == 0) 1514 return (SET_ERROR(EEXIST)); 1515 if (error != ENOENT) 1516 return (error); 1517 1518 /* 1519 * We don't allow taking snapshots of inconsistent datasets, such as 1520 * those into which we are currently receiving. However, if we are 1521 * creating this snapshot as part of a receive, this check will be 1522 * executed atomically with respect to the completion of the receive 1523 * itself but prior to the clearing of DS_FLAG_INCONSISTENT; in this 1524 * case we ignore this, knowing it will be fixed up for us shortly in 1525 * dmu_recv_end_sync(). 1526 */ 1527 if (!recv && DS_IS_INCONSISTENT(ds)) 1528 return (SET_ERROR(EBUSY)); 1529 1530 /* 1531 * Skip the check for temporary snapshots or if we have already checked 1532 * the counts in dsl_dataset_snapshot_check. This means we really only 1533 * check the count here when we're receiving a stream. 1534 */ 1535 if (cnt != 0 && cr != NULL) { 1536 error = dsl_fs_ss_limit_check(ds->ds_dir, cnt, 1537 ZFS_PROP_SNAPSHOT_LIMIT, NULL, cr, proc); 1538 if (error != 0) 1539 return (error); 1540 } 1541 1542 error = dsl_dataset_snapshot_reserve_space(ds, tx); 1543 if (error != 0) 1544 return (error); 1545 1546 return (0); 1547 } 1548 1549 int 1550 dsl_dataset_snapshot_check(void *arg, dmu_tx_t *tx) 1551 { 1552 dsl_dataset_snapshot_arg_t *ddsa = arg; 1553 dsl_pool_t *dp = dmu_tx_pool(tx); 1554 nvpair_t *pair; 1555 int rv = 0; 1556 1557 /* 1558 * Pre-compute how many total new snapshots will be created for each 1559 * level in the tree and below. This is needed for validating the 1560 * snapshot limit when either taking a recursive snapshot or when 1561 * taking multiple snapshots. 1562 * 1563 * The problem is that the counts are not actually adjusted when 1564 * we are checking, only when we finally sync. For a single snapshot, 1565 * this is easy, the count will increase by 1 at each node up the tree, 1566 * but its more complicated for the recursive/multiple snapshot case. 1567 * 1568 * The dsl_fs_ss_limit_check function does recursively check the count 1569 * at each level up the tree but since it is validating each snapshot 1570 * independently we need to be sure that we are validating the complete 1571 * count for the entire set of snapshots. We do this by rolling up the 1572 * counts for each component of the name into an nvlist and then 1573 * checking each of those cases with the aggregated count. 1574 * 1575 * This approach properly handles not only the recursive snapshot 1576 * case (where we get all of those on the ddsa_snaps list) but also 1577 * the sibling case (e.g. snapshot a/b and a/c so that we will also 1578 * validate the limit on 'a' using a count of 2). 1579 * 1580 * We validate the snapshot names in the third loop and only report 1581 * name errors once. 1582 */ 1583 if (dmu_tx_is_syncing(tx)) { 1584 char *nm; 1585 nvlist_t *cnt_track = NULL; 1586 cnt_track = fnvlist_alloc(); 1587 1588 nm = kmem_alloc(MAXPATHLEN, KM_SLEEP); 1589 1590 /* Rollup aggregated counts into the cnt_track list */ 1591 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL); 1592 pair != NULL; 1593 pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) { 1594 char *pdelim; 1595 uint64_t val; 1596 1597 (void) strlcpy(nm, nvpair_name(pair), MAXPATHLEN); 1598 pdelim = strchr(nm, '@'); 1599 if (pdelim == NULL) 1600 continue; 1601 *pdelim = '\0'; 1602 1603 do { 1604 if (nvlist_lookup_uint64(cnt_track, nm, 1605 &val) == 0) { 1606 /* update existing entry */ 1607 fnvlist_add_uint64(cnt_track, nm, 1608 val + 1); 1609 } else { 1610 /* add to list */ 1611 fnvlist_add_uint64(cnt_track, nm, 1); 1612 } 1613 1614 pdelim = strrchr(nm, '/'); 1615 if (pdelim != NULL) 1616 *pdelim = '\0'; 1617 } while (pdelim != NULL); 1618 } 1619 1620 kmem_free(nm, MAXPATHLEN); 1621 1622 /* Check aggregated counts at each level */ 1623 for (pair = nvlist_next_nvpair(cnt_track, NULL); 1624 pair != NULL; pair = nvlist_next_nvpair(cnt_track, pair)) { 1625 int error = 0; 1626 char *name; 1627 uint64_t cnt = 0; 1628 dsl_dataset_t *ds; 1629 1630 name = nvpair_name(pair); 1631 cnt = fnvpair_value_uint64(pair); 1632 ASSERT(cnt > 0); 1633 1634 error = dsl_dataset_hold(dp, name, FTAG, &ds); 1635 if (error == 0) { 1636 error = dsl_fs_ss_limit_check(ds->ds_dir, cnt, 1637 ZFS_PROP_SNAPSHOT_LIMIT, NULL, 1638 ddsa->ddsa_cr, ddsa->ddsa_proc); 1639 dsl_dataset_rele(ds, FTAG); 1640 } 1641 1642 if (error != 0) { 1643 if (ddsa->ddsa_errors != NULL) 1644 fnvlist_add_int32(ddsa->ddsa_errors, 1645 name, error); 1646 rv = error; 1647 /* only report one error for this check */ 1648 break; 1649 } 1650 } 1651 nvlist_free(cnt_track); 1652 } 1653 1654 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL); 1655 pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) { 1656 int error = 0; 1657 dsl_dataset_t *ds; 1658 char *name, *atp = NULL; 1659 char dsname[ZFS_MAX_DATASET_NAME_LEN]; 1660 1661 name = nvpair_name(pair); 1662 if (strlen(name) >= ZFS_MAX_DATASET_NAME_LEN) 1663 error = SET_ERROR(ENAMETOOLONG); 1664 if (error == 0) { 1665 atp = strchr(name, '@'); 1666 if (atp == NULL) 1667 error = SET_ERROR(EINVAL); 1668 if (error == 0) 1669 (void) strlcpy(dsname, name, atp - name + 1); 1670 } 1671 if (error == 0) 1672 error = dsl_dataset_hold(dp, dsname, FTAG, &ds); 1673 if (error == 0) { 1674 /* passing 0/NULL skips dsl_fs_ss_limit_check */ 1675 error = dsl_dataset_snapshot_check_impl(ds, 1676 atp + 1, tx, B_FALSE, 0, NULL, NULL); 1677 dsl_dataset_rele(ds, FTAG); 1678 } 1679 1680 if (error != 0) { 1681 if (ddsa->ddsa_errors != NULL) { 1682 fnvlist_add_int32(ddsa->ddsa_errors, 1683 name, error); 1684 } 1685 rv = error; 1686 } 1687 } 1688 1689 return (rv); 1690 } 1691 1692 void 1693 dsl_dataset_snapshot_sync_impl(dsl_dataset_t *ds, const char *snapname, 1694 dmu_tx_t *tx) 1695 { 1696 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1697 dmu_buf_t *dbuf; 1698 dsl_dataset_phys_t *dsphys; 1699 uint64_t dsobj, crtxg; 1700 objset_t *mos = dp->dp_meta_objset; 1701 static zil_header_t zero_zil __maybe_unused; 1702 objset_t *os __maybe_unused; 1703 1704 ASSERT(RRW_WRITE_HELD(&dp->dp_config_rwlock)); 1705 1706 /* 1707 * If we are on an old pool, the zil must not be active, in which 1708 * case it will be zeroed. Usually zil_suspend() accomplishes this. 1709 */ 1710 ASSERT(spa_version(dmu_tx_pool(tx)->dp_spa) >= SPA_VERSION_FAST_SNAP || 1711 dmu_objset_from_ds(ds, &os) != 0 || 1712 memcmp(&os->os_phys->os_zil_header, &zero_zil, 1713 sizeof (zero_zil)) == 0); 1714 1715 /* Should not snapshot a dirty dataset. */ 1716 ASSERT(!txg_list_member(&ds->ds_dir->dd_pool->dp_dirty_datasets, 1717 ds, tx->tx_txg)); 1718 1719 dsl_fs_ss_count_adjust(ds->ds_dir, 1, DD_FIELD_SNAPSHOT_COUNT, tx); 1720 1721 /* 1722 * The origin's ds_creation_txg has to be < TXG_INITIAL 1723 */ 1724 if (strcmp(snapname, ORIGIN_DIR_NAME) == 0) 1725 crtxg = 1; 1726 else 1727 crtxg = tx->tx_txg; 1728 1729 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, 1730 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); 1731 VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); 1732 dmu_buf_will_dirty(dbuf, tx); 1733 dsphys = dbuf->db_data; 1734 memset(dsphys, 0, sizeof (dsl_dataset_phys_t)); 1735 dsphys->ds_dir_obj = ds->ds_dir->dd_object; 1736 dsphys->ds_fsid_guid = unique_create(); 1737 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, 1738 sizeof (dsphys->ds_guid)); 1739 dsphys->ds_prev_snap_obj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 1740 dsphys->ds_prev_snap_txg = dsl_dataset_phys(ds)->ds_prev_snap_txg; 1741 dsphys->ds_next_snap_obj = ds->ds_object; 1742 dsphys->ds_num_children = 1; 1743 dsphys->ds_creation_time = gethrestime_sec(); 1744 dsphys->ds_creation_txg = crtxg; 1745 dsphys->ds_deadlist_obj = dsl_dataset_phys(ds)->ds_deadlist_obj; 1746 dsphys->ds_referenced_bytes = dsl_dataset_phys(ds)->ds_referenced_bytes; 1747 dsphys->ds_compressed_bytes = dsl_dataset_phys(ds)->ds_compressed_bytes; 1748 dsphys->ds_uncompressed_bytes = 1749 dsl_dataset_phys(ds)->ds_uncompressed_bytes; 1750 dsphys->ds_flags = dsl_dataset_phys(ds)->ds_flags; 1751 rrw_enter(&ds->ds_bp_rwlock, RW_READER, FTAG); 1752 dsphys->ds_bp = dsl_dataset_phys(ds)->ds_bp; 1753 rrw_exit(&ds->ds_bp_rwlock, FTAG); 1754 dmu_buf_rele(dbuf, FTAG); 1755 1756 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 1757 if (zfeature_active(f, ds->ds_feature[f])) { 1758 dsl_dataset_activate_feature(dsobj, f, 1759 ds->ds_feature[f], tx); 1760 } 1761 } 1762 1763 /* 1764 * We are not allowed to dirty a filesystem when done receiving 1765 * a snapshot. In this case the flag SPA_FEATURE_LARGE_BLOCKS will 1766 * not be set and a subsequent encrypted raw send will fail. Hence 1767 * activate this feature if needed here. 1768 */ 1769 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 1770 if (zfeature_active(f, ds->ds_feature_activation[f]) && 1771 !(zfeature_active(f, ds->ds_feature[f]))) { 1772 dsl_dataset_activate_feature(dsobj, f, 1773 ds->ds_feature_activation[f], tx); 1774 ds->ds_feature[f] = ds->ds_feature_activation[f]; 1775 } 1776 } 1777 1778 ASSERT3U(ds->ds_prev != 0, ==, 1779 dsl_dataset_phys(ds)->ds_prev_snap_obj != 0); 1780 if (ds->ds_prev) { 1781 uint64_t next_clones_obj = 1782 dsl_dataset_phys(ds->ds_prev)->ds_next_clones_obj; 1783 ASSERT(dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj == 1784 ds->ds_object || 1785 dsl_dataset_phys(ds->ds_prev)->ds_num_children > 1); 1786 if (dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj == 1787 ds->ds_object) { 1788 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); 1789 ASSERT3U(dsl_dataset_phys(ds)->ds_prev_snap_txg, ==, 1790 dsl_dataset_phys(ds->ds_prev)->ds_creation_txg); 1791 dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj = dsobj; 1792 } else if (next_clones_obj != 0) { 1793 dsl_dataset_remove_from_next_clones(ds->ds_prev, 1794 dsphys->ds_next_snap_obj, tx); 1795 VERIFY0(zap_add_int(mos, 1796 next_clones_obj, dsobj, tx)); 1797 } 1798 } 1799 1800 /* 1801 * If we have a reference-reservation on this dataset, we will 1802 * need to increase the amount of refreservation being charged 1803 * since our unique space is going to zero. 1804 */ 1805 if (ds->ds_reserved) { 1806 int64_t delta; 1807 ASSERT(DS_UNIQUE_IS_ACCURATE(ds)); 1808 delta = MIN(dsl_dataset_phys(ds)->ds_unique_bytes, 1809 ds->ds_reserved); 1810 dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV, 1811 delta, 0, 0, tx); 1812 } 1813 1814 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1815 dsl_dataset_phys(ds)->ds_deadlist_obj = 1816 dsl_deadlist_clone(&ds->ds_deadlist, UINT64_MAX, 1817 dsl_dataset_phys(ds)->ds_prev_snap_obj, tx); 1818 dsl_deadlist_close(&ds->ds_deadlist); 1819 dsl_deadlist_open(&ds->ds_deadlist, mos, 1820 dsl_dataset_phys(ds)->ds_deadlist_obj); 1821 dsl_deadlist_add_key(&ds->ds_deadlist, 1822 dsl_dataset_phys(ds)->ds_prev_snap_txg, tx); 1823 dsl_bookmark_snapshotted(ds, tx); 1824 1825 if (dsl_dataset_remap_deadlist_exists(ds)) { 1826 uint64_t remap_deadlist_obj = 1827 dsl_dataset_get_remap_deadlist_object(ds); 1828 /* 1829 * Move the remap_deadlist to the snapshot. The head 1830 * will create a new remap deadlist on demand, from 1831 * dsl_dataset_block_remapped(). 1832 */ 1833 dsl_dataset_unset_remap_deadlist_object(ds, tx); 1834 dsl_deadlist_close(&ds->ds_remap_deadlist); 1835 1836 dmu_object_zapify(mos, dsobj, DMU_OT_DSL_DATASET, tx); 1837 VERIFY0(zap_add(mos, dsobj, DS_FIELD_REMAP_DEADLIST, 1838 sizeof (remap_deadlist_obj), 1, &remap_deadlist_obj, tx)); 1839 } 1840 1841 /* 1842 * Create a ivset guid for this snapshot if the dataset is 1843 * encrypted. This may be overridden by a raw receive. A 1844 * previous implementation of this code did not have this 1845 * field as part of the on-disk format for ZFS encryption 1846 * (see errata #4). As part of the remediation for this 1847 * issue, we ask the user to enable the bookmark_v2 feature 1848 * which is now a dependency of the encryption feature. We 1849 * use this as a heuristic to determine when the user has 1850 * elected to correct any datasets created with the old code. 1851 * As a result, we only do this step if the bookmark_v2 1852 * feature is enabled, which limits the number of states a 1853 * given pool / dataset can be in with regards to terms of 1854 * correcting the issue. 1855 */ 1856 if (ds->ds_dir->dd_crypto_obj != 0 && 1857 spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_BOOKMARK_V2)) { 1858 uint64_t ivset_guid = unique_create(); 1859 1860 dmu_object_zapify(mos, dsobj, DMU_OT_DSL_DATASET, tx); 1861 VERIFY0(zap_add(mos, dsobj, DS_FIELD_IVSET_GUID, 1862 sizeof (ivset_guid), 1, &ivset_guid, tx)); 1863 } 1864 1865 ASSERT3U(dsl_dataset_phys(ds)->ds_prev_snap_txg, <, tx->tx_txg); 1866 dsl_dataset_phys(ds)->ds_prev_snap_obj = dsobj; 1867 dsl_dataset_phys(ds)->ds_prev_snap_txg = crtxg; 1868 dsl_dataset_phys(ds)->ds_unique_bytes = 0; 1869 1870 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE) 1871 dsl_dataset_phys(ds)->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 1872 1873 VERIFY0(zap_add(mos, dsl_dataset_phys(ds)->ds_snapnames_zapobj, 1874 snapname, 8, 1, &dsobj, tx)); 1875 1876 if (ds->ds_prev) 1877 dsl_dataset_rele(ds->ds_prev, ds); 1878 VERIFY0(dsl_dataset_hold_obj(dp, 1879 dsl_dataset_phys(ds)->ds_prev_snap_obj, ds, &ds->ds_prev)); 1880 1881 dsl_scan_ds_snapshotted(ds, tx); 1882 1883 dsl_dir_snap_cmtime_update(ds->ds_dir, tx); 1884 1885 if (zfs_snapshot_history_enabled) 1886 spa_history_log_internal_ds(ds->ds_prev, "snapshot", tx, " "); 1887 } 1888 1889 void 1890 dsl_dataset_snapshot_sync(void *arg, dmu_tx_t *tx) 1891 { 1892 dsl_dataset_snapshot_arg_t *ddsa = arg; 1893 dsl_pool_t *dp = dmu_tx_pool(tx); 1894 nvpair_t *pair; 1895 1896 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL); 1897 pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) { 1898 dsl_dataset_t *ds; 1899 char *name, *atp; 1900 char dsname[ZFS_MAX_DATASET_NAME_LEN]; 1901 1902 name = nvpair_name(pair); 1903 atp = strchr(name, '@'); 1904 (void) strlcpy(dsname, name, atp - name + 1); 1905 VERIFY0(dsl_dataset_hold(dp, dsname, FTAG, &ds)); 1906 1907 dsl_dataset_snapshot_sync_impl(ds, atp + 1, tx); 1908 if (ddsa->ddsa_props != NULL) { 1909 dsl_props_set_sync_impl(ds->ds_prev, 1910 ZPROP_SRC_LOCAL, ddsa->ddsa_props, tx); 1911 } 1912 dsl_dataset_rele(ds, FTAG); 1913 } 1914 } 1915 1916 /* 1917 * The snapshots must all be in the same pool. 1918 * All-or-nothing: if there are any failures, nothing will be modified. 1919 */ 1920 int 1921 dsl_dataset_snapshot(nvlist_t *snaps, nvlist_t *props, nvlist_t *errors) 1922 { 1923 dsl_dataset_snapshot_arg_t ddsa; 1924 nvpair_t *pair; 1925 boolean_t needsuspend; 1926 int error; 1927 spa_t *spa; 1928 char *firstname; 1929 nvlist_t *suspended = NULL; 1930 1931 pair = nvlist_next_nvpair(snaps, NULL); 1932 if (pair == NULL) 1933 return (0); 1934 firstname = nvpair_name(pair); 1935 1936 error = spa_open(firstname, &spa, FTAG); 1937 if (error != 0) 1938 return (error); 1939 needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP); 1940 spa_close(spa, FTAG); 1941 1942 if (needsuspend) { 1943 suspended = fnvlist_alloc(); 1944 for (pair = nvlist_next_nvpair(snaps, NULL); pair != NULL; 1945 pair = nvlist_next_nvpair(snaps, pair)) { 1946 char fsname[ZFS_MAX_DATASET_NAME_LEN]; 1947 char *snapname = nvpair_name(pair); 1948 char *atp; 1949 void *cookie; 1950 1951 atp = strchr(snapname, '@'); 1952 if (atp == NULL) { 1953 error = SET_ERROR(EINVAL); 1954 break; 1955 } 1956 (void) strlcpy(fsname, snapname, atp - snapname + 1); 1957 1958 error = zil_suspend(fsname, &cookie); 1959 if (error != 0) 1960 break; 1961 fnvlist_add_uint64(suspended, fsname, 1962 (uintptr_t)cookie); 1963 } 1964 } 1965 1966 ddsa.ddsa_snaps = snaps; 1967 ddsa.ddsa_props = props; 1968 ddsa.ddsa_errors = errors; 1969 ddsa.ddsa_cr = CRED(); 1970 ddsa.ddsa_proc = curproc; 1971 1972 if (error == 0) { 1973 error = dsl_sync_task(firstname, dsl_dataset_snapshot_check, 1974 dsl_dataset_snapshot_sync, &ddsa, 1975 fnvlist_num_pairs(snaps) * 3, ZFS_SPACE_CHECK_NORMAL); 1976 } 1977 1978 if (suspended != NULL) { 1979 for (pair = nvlist_next_nvpair(suspended, NULL); pair != NULL; 1980 pair = nvlist_next_nvpair(suspended, pair)) { 1981 zil_resume((void *)(uintptr_t) 1982 fnvpair_value_uint64(pair)); 1983 } 1984 fnvlist_free(suspended); 1985 } 1986 1987 if (error == 0) { 1988 for (pair = nvlist_next_nvpair(snaps, NULL); pair != NULL; 1989 pair = nvlist_next_nvpair(snaps, pair)) { 1990 zvol_create_minor(nvpair_name(pair)); 1991 } 1992 } 1993 1994 return (error); 1995 } 1996 1997 typedef struct dsl_dataset_snapshot_tmp_arg { 1998 const char *ddsta_fsname; 1999 const char *ddsta_snapname; 2000 minor_t ddsta_cleanup_minor; 2001 const char *ddsta_htag; 2002 } dsl_dataset_snapshot_tmp_arg_t; 2003 2004 static int 2005 dsl_dataset_snapshot_tmp_check(void *arg, dmu_tx_t *tx) 2006 { 2007 dsl_dataset_snapshot_tmp_arg_t *ddsta = arg; 2008 dsl_pool_t *dp = dmu_tx_pool(tx); 2009 dsl_dataset_t *ds; 2010 int error; 2011 2012 error = dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds); 2013 if (error != 0) 2014 return (error); 2015 2016 /* NULL cred means no limit check for tmp snapshot */ 2017 error = dsl_dataset_snapshot_check_impl(ds, ddsta->ddsta_snapname, 2018 tx, B_FALSE, 0, NULL, NULL); 2019 if (error != 0) { 2020 dsl_dataset_rele(ds, FTAG); 2021 return (error); 2022 } 2023 2024 if (spa_version(dp->dp_spa) < SPA_VERSION_USERREFS) { 2025 dsl_dataset_rele(ds, FTAG); 2026 return (SET_ERROR(ENOTSUP)); 2027 } 2028 error = dsl_dataset_user_hold_check_one(NULL, ddsta->ddsta_htag, 2029 B_TRUE, tx); 2030 if (error != 0) { 2031 dsl_dataset_rele(ds, FTAG); 2032 return (error); 2033 } 2034 2035 dsl_dataset_rele(ds, FTAG); 2036 return (0); 2037 } 2038 2039 static void 2040 dsl_dataset_snapshot_tmp_sync(void *arg, dmu_tx_t *tx) 2041 { 2042 dsl_dataset_snapshot_tmp_arg_t *ddsta = arg; 2043 dsl_pool_t *dp = dmu_tx_pool(tx); 2044 dsl_dataset_t *ds = NULL; 2045 2046 VERIFY0(dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds)); 2047 2048 dsl_dataset_snapshot_sync_impl(ds, ddsta->ddsta_snapname, tx); 2049 dsl_dataset_user_hold_sync_one(ds->ds_prev, ddsta->ddsta_htag, 2050 ddsta->ddsta_cleanup_minor, gethrestime_sec(), tx); 2051 dsl_destroy_snapshot_sync_impl(ds->ds_prev, B_TRUE, tx); 2052 2053 dsl_dataset_rele(ds, FTAG); 2054 } 2055 2056 int 2057 dsl_dataset_snapshot_tmp(const char *fsname, const char *snapname, 2058 minor_t cleanup_minor, const char *htag) 2059 { 2060 dsl_dataset_snapshot_tmp_arg_t ddsta; 2061 int error; 2062 spa_t *spa; 2063 boolean_t needsuspend; 2064 void *cookie; 2065 2066 ddsta.ddsta_fsname = fsname; 2067 ddsta.ddsta_snapname = snapname; 2068 ddsta.ddsta_cleanup_minor = cleanup_minor; 2069 ddsta.ddsta_htag = htag; 2070 2071 error = spa_open(fsname, &spa, FTAG); 2072 if (error != 0) 2073 return (error); 2074 needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP); 2075 spa_close(spa, FTAG); 2076 2077 if (needsuspend) { 2078 error = zil_suspend(fsname, &cookie); 2079 if (error != 0) 2080 return (error); 2081 } 2082 2083 error = dsl_sync_task(fsname, dsl_dataset_snapshot_tmp_check, 2084 dsl_dataset_snapshot_tmp_sync, &ddsta, 3, ZFS_SPACE_CHECK_RESERVED); 2085 2086 if (needsuspend) 2087 zil_resume(cookie); 2088 return (error); 2089 } 2090 2091 void 2092 dsl_dataset_sync(dsl_dataset_t *ds, zio_t *zio, dmu_tx_t *tx) 2093 { 2094 ASSERT(dmu_tx_is_syncing(tx)); 2095 ASSERT(ds->ds_objset != NULL); 2096 ASSERT(dsl_dataset_phys(ds)->ds_next_snap_obj == 0); 2097 2098 /* 2099 * in case we had to change ds_fsid_guid when we opened it, 2100 * sync it out now. 2101 */ 2102 dmu_buf_will_dirty(ds->ds_dbuf, tx); 2103 dsl_dataset_phys(ds)->ds_fsid_guid = ds->ds_fsid_guid; 2104 2105 if (ds->ds_resume_bytes[tx->tx_txg & TXG_MASK] != 0) { 2106 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset, 2107 ds->ds_object, DS_FIELD_RESUME_OBJECT, 8, 1, 2108 &ds->ds_resume_object[tx->tx_txg & TXG_MASK], tx)); 2109 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset, 2110 ds->ds_object, DS_FIELD_RESUME_OFFSET, 8, 1, 2111 &ds->ds_resume_offset[tx->tx_txg & TXG_MASK], tx)); 2112 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset, 2113 ds->ds_object, DS_FIELD_RESUME_BYTES, 8, 1, 2114 &ds->ds_resume_bytes[tx->tx_txg & TXG_MASK], tx)); 2115 ds->ds_resume_object[tx->tx_txg & TXG_MASK] = 0; 2116 ds->ds_resume_offset[tx->tx_txg & TXG_MASK] = 0; 2117 ds->ds_resume_bytes[tx->tx_txg & TXG_MASK] = 0; 2118 } 2119 2120 dmu_objset_sync(ds->ds_objset, zio, tx); 2121 2122 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 2123 if (zfeature_active(f, ds->ds_feature_activation[f])) { 2124 if (zfeature_active(f, ds->ds_feature[f])) 2125 continue; 2126 dsl_dataset_activate_feature(ds->ds_object, f, 2127 ds->ds_feature_activation[f], tx); 2128 ds->ds_feature[f] = ds->ds_feature_activation[f]; 2129 } 2130 } 2131 } 2132 2133 /* 2134 * Check if the percentage of blocks shared between the clone and the 2135 * snapshot (as opposed to those that are clone only) is below a certain 2136 * threshold 2137 */ 2138 static boolean_t 2139 dsl_livelist_should_disable(dsl_dataset_t *ds) 2140 { 2141 uint64_t used, referenced; 2142 int percent_shared; 2143 2144 used = dsl_dir_get_usedds(ds->ds_dir); 2145 referenced = dsl_get_referenced(ds); 2146 if (referenced == 0) 2147 return (B_FALSE); 2148 percent_shared = (100 * (referenced - used)) / referenced; 2149 if (percent_shared <= zfs_livelist_min_percent_shared) 2150 return (B_TRUE); 2151 return (B_FALSE); 2152 } 2153 2154 /* 2155 * Check if it is possible to combine two livelist entries into one. 2156 * This is the case if the combined number of 'live' blkptrs (ALLOCs that 2157 * don't have a matching FREE) is under the maximum sublist size. 2158 * We check this by subtracting twice the total number of frees from the total 2159 * number of blkptrs. FREEs are counted twice because each FREE blkptr 2160 * will cancel out an ALLOC blkptr when the livelist is processed. 2161 */ 2162 static boolean_t 2163 dsl_livelist_should_condense(dsl_deadlist_entry_t *first, 2164 dsl_deadlist_entry_t *next) 2165 { 2166 uint64_t total_free = first->dle_bpobj.bpo_phys->bpo_num_freed + 2167 next->dle_bpobj.bpo_phys->bpo_num_freed; 2168 uint64_t total_entries = first->dle_bpobj.bpo_phys->bpo_num_blkptrs + 2169 next->dle_bpobj.bpo_phys->bpo_num_blkptrs; 2170 if ((total_entries - (2 * total_free)) < zfs_livelist_max_entries) 2171 return (B_TRUE); 2172 return (B_FALSE); 2173 } 2174 2175 typedef struct try_condense_arg { 2176 spa_t *spa; 2177 dsl_dataset_t *ds; 2178 } try_condense_arg_t; 2179 2180 /* 2181 * Iterate over the livelist entries, searching for a pair to condense. 2182 * A nonzero return value means stop, 0 means keep looking. 2183 */ 2184 static int 2185 dsl_livelist_try_condense(void *arg, dsl_deadlist_entry_t *first) 2186 { 2187 try_condense_arg_t *tca = arg; 2188 spa_t *spa = tca->spa; 2189 dsl_dataset_t *ds = tca->ds; 2190 dsl_deadlist_t *ll = &ds->ds_dir->dd_livelist; 2191 dsl_deadlist_entry_t *next; 2192 2193 /* The condense thread has not yet been created at import */ 2194 if (spa->spa_livelist_condense_zthr == NULL) 2195 return (1); 2196 2197 /* A condense is already in progress */ 2198 if (spa->spa_to_condense.ds != NULL) 2199 return (1); 2200 2201 next = AVL_NEXT(&ll->dl_tree, &first->dle_node); 2202 /* The livelist has only one entry - don't condense it */ 2203 if (next == NULL) 2204 return (1); 2205 2206 /* Next is the newest entry - don't condense it */ 2207 if (AVL_NEXT(&ll->dl_tree, &next->dle_node) == NULL) 2208 return (1); 2209 2210 /* This pair is not ready to condense but keep looking */ 2211 if (!dsl_livelist_should_condense(first, next)) 2212 return (0); 2213 2214 /* 2215 * Add a ref to prevent the dataset from being evicted while 2216 * the condense zthr or synctask are running. Ref will be 2217 * released at the end of the condense synctask 2218 */ 2219 dmu_buf_add_ref(ds->ds_dbuf, spa); 2220 2221 spa->spa_to_condense.ds = ds; 2222 spa->spa_to_condense.first = first; 2223 spa->spa_to_condense.next = next; 2224 spa->spa_to_condense.syncing = B_FALSE; 2225 spa->spa_to_condense.cancelled = B_FALSE; 2226 2227 zthr_wakeup(spa->spa_livelist_condense_zthr); 2228 return (1); 2229 } 2230 2231 static void 2232 dsl_flush_pending_livelist(dsl_dataset_t *ds, dmu_tx_t *tx) 2233 { 2234 dsl_dir_t *dd = ds->ds_dir; 2235 spa_t *spa = ds->ds_dir->dd_pool->dp_spa; 2236 dsl_deadlist_entry_t *last = dsl_deadlist_last(&dd->dd_livelist); 2237 2238 /* Check if we need to add a new sub-livelist */ 2239 if (last == NULL) { 2240 /* The livelist is empty */ 2241 dsl_deadlist_add_key(&dd->dd_livelist, 2242 tx->tx_txg - 1, tx); 2243 } else if (spa_sync_pass(spa) == 1) { 2244 /* 2245 * Check if the newest entry is full. If it is, make a new one. 2246 * We only do this once per sync because we could overfill a 2247 * sublist in one sync pass and don't want to add another entry 2248 * for a txg that is already represented. This ensures that 2249 * blkptrs born in the same txg are stored in the same sublist. 2250 */ 2251 bpobj_t bpobj = last->dle_bpobj; 2252 uint64_t all = bpobj.bpo_phys->bpo_num_blkptrs; 2253 uint64_t free = bpobj.bpo_phys->bpo_num_freed; 2254 uint64_t alloc = all - free; 2255 if (alloc > zfs_livelist_max_entries) { 2256 dsl_deadlist_add_key(&dd->dd_livelist, 2257 tx->tx_txg - 1, tx); 2258 } 2259 } 2260 2261 /* Insert each entry into the on-disk livelist */ 2262 bplist_iterate(&dd->dd_pending_allocs, 2263 dsl_deadlist_insert_alloc_cb, &dd->dd_livelist, tx); 2264 bplist_iterate(&dd->dd_pending_frees, 2265 dsl_deadlist_insert_free_cb, &dd->dd_livelist, tx); 2266 2267 /* Attempt to condense every pair of adjacent entries */ 2268 try_condense_arg_t arg = { 2269 .spa = spa, 2270 .ds = ds 2271 }; 2272 dsl_deadlist_iterate(&dd->dd_livelist, dsl_livelist_try_condense, 2273 &arg); 2274 } 2275 2276 void 2277 dsl_dataset_sync_done(dsl_dataset_t *ds, dmu_tx_t *tx) 2278 { 2279 objset_t *os = ds->ds_objset; 2280 2281 bplist_iterate(&ds->ds_pending_deadlist, 2282 dsl_deadlist_insert_alloc_cb, &ds->ds_deadlist, tx); 2283 2284 if (dsl_deadlist_is_open(&ds->ds_dir->dd_livelist)) { 2285 dsl_flush_pending_livelist(ds, tx); 2286 if (dsl_livelist_should_disable(ds)) { 2287 dsl_dir_remove_livelist(ds->ds_dir, tx, B_TRUE); 2288 } 2289 } 2290 2291 dsl_bookmark_sync_done(ds, tx); 2292 2293 multilist_destroy(&os->os_synced_dnodes); 2294 2295 if (os->os_encrypted) 2296 os->os_next_write_raw[tx->tx_txg & TXG_MASK] = B_FALSE; 2297 else 2298 ASSERT0(os->os_next_write_raw[tx->tx_txg & TXG_MASK]); 2299 2300 ASSERT(!dmu_objset_is_dirty(os, dmu_tx_get_txg(tx))); 2301 2302 dmu_buf_rele(ds->ds_dbuf, ds); 2303 } 2304 2305 int 2306 get_clones_stat_impl(dsl_dataset_t *ds, nvlist_t *val) 2307 { 2308 uint64_t count = 0; 2309 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 2310 zap_cursor_t zc; 2311 zap_attribute_t za; 2312 2313 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool)); 2314 2315 /* 2316 * There may be missing entries in ds_next_clones_obj 2317 * due to a bug in a previous version of the code. 2318 * Only trust it if it has the right number of entries. 2319 */ 2320 if (dsl_dataset_phys(ds)->ds_next_clones_obj != 0) { 2321 VERIFY0(zap_count(mos, dsl_dataset_phys(ds)->ds_next_clones_obj, 2322 &count)); 2323 } 2324 if (count != dsl_dataset_phys(ds)->ds_num_children - 1) { 2325 return (SET_ERROR(ENOENT)); 2326 } 2327 for (zap_cursor_init(&zc, mos, 2328 dsl_dataset_phys(ds)->ds_next_clones_obj); 2329 zap_cursor_retrieve(&zc, &za) == 0; 2330 zap_cursor_advance(&zc)) { 2331 dsl_dataset_t *clone; 2332 char buf[ZFS_MAX_DATASET_NAME_LEN]; 2333 VERIFY0(dsl_dataset_hold_obj(ds->ds_dir->dd_pool, 2334 za.za_first_integer, FTAG, &clone)); 2335 dsl_dir_name(clone->ds_dir, buf); 2336 fnvlist_add_boolean(val, buf); 2337 dsl_dataset_rele(clone, FTAG); 2338 } 2339 zap_cursor_fini(&zc); 2340 return (0); 2341 } 2342 2343 void 2344 get_clones_stat(dsl_dataset_t *ds, nvlist_t *nv) 2345 { 2346 nvlist_t *propval = fnvlist_alloc(); 2347 nvlist_t *val = fnvlist_alloc(); 2348 2349 if (get_clones_stat_impl(ds, val) == 0) { 2350 fnvlist_add_nvlist(propval, ZPROP_VALUE, val); 2351 fnvlist_add_nvlist(nv, zfs_prop_to_name(ZFS_PROP_CLONES), 2352 propval); 2353 } 2354 2355 nvlist_free(val); 2356 nvlist_free(propval); 2357 } 2358 2359 static char * 2360 get_receive_resume_token_impl(dsl_dataset_t *ds) 2361 { 2362 if (!dsl_dataset_has_resume_receive_state(ds)) 2363 return (NULL); 2364 2365 dsl_pool_t *dp = ds->ds_dir->dd_pool; 2366 char *str; 2367 void *packed; 2368 uint8_t *compressed; 2369 uint64_t val; 2370 nvlist_t *token_nv = fnvlist_alloc(); 2371 size_t packed_size, compressed_size; 2372 2373 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 2374 DS_FIELD_RESUME_FROMGUID, sizeof (val), 1, &val) == 0) { 2375 fnvlist_add_uint64(token_nv, "fromguid", val); 2376 } 2377 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 2378 DS_FIELD_RESUME_OBJECT, sizeof (val), 1, &val) == 0) { 2379 fnvlist_add_uint64(token_nv, "object", val); 2380 } 2381 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 2382 DS_FIELD_RESUME_OFFSET, sizeof (val), 1, &val) == 0) { 2383 fnvlist_add_uint64(token_nv, "offset", val); 2384 } 2385 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 2386 DS_FIELD_RESUME_BYTES, sizeof (val), 1, &val) == 0) { 2387 fnvlist_add_uint64(token_nv, "bytes", val); 2388 } 2389 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 2390 DS_FIELD_RESUME_TOGUID, sizeof (val), 1, &val) == 0) { 2391 fnvlist_add_uint64(token_nv, "toguid", val); 2392 } 2393 char buf[MAXNAMELEN]; 2394 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 2395 DS_FIELD_RESUME_TONAME, 1, sizeof (buf), buf) == 0) { 2396 fnvlist_add_string(token_nv, "toname", buf); 2397 } 2398 if (zap_contains(dp->dp_meta_objset, ds->ds_object, 2399 DS_FIELD_RESUME_LARGEBLOCK) == 0) { 2400 fnvlist_add_boolean(token_nv, "largeblockok"); 2401 } 2402 if (zap_contains(dp->dp_meta_objset, ds->ds_object, 2403 DS_FIELD_RESUME_EMBEDOK) == 0) { 2404 fnvlist_add_boolean(token_nv, "embedok"); 2405 } 2406 if (zap_contains(dp->dp_meta_objset, ds->ds_object, 2407 DS_FIELD_RESUME_COMPRESSOK) == 0) { 2408 fnvlist_add_boolean(token_nv, "compressok"); 2409 } 2410 if (zap_contains(dp->dp_meta_objset, ds->ds_object, 2411 DS_FIELD_RESUME_RAWOK) == 0) { 2412 fnvlist_add_boolean(token_nv, "rawok"); 2413 } 2414 if (dsl_dataset_feature_is_active(ds, 2415 SPA_FEATURE_REDACTED_DATASETS)) { 2416 uint64_t num_redact_snaps = 0; 2417 uint64_t *redact_snaps = NULL; 2418 VERIFY3B(dsl_dataset_get_uint64_array_feature(ds, 2419 SPA_FEATURE_REDACTED_DATASETS, &num_redact_snaps, 2420 &redact_snaps), ==, B_TRUE); 2421 fnvlist_add_uint64_array(token_nv, "redact_snaps", 2422 redact_snaps, num_redact_snaps); 2423 } 2424 if (zap_contains(dp->dp_meta_objset, ds->ds_object, 2425 DS_FIELD_RESUME_REDACT_BOOKMARK_SNAPS) == 0) { 2426 uint64_t num_redact_snaps = 0, int_size = 0; 2427 uint64_t *redact_snaps = NULL; 2428 VERIFY0(zap_length(dp->dp_meta_objset, ds->ds_object, 2429 DS_FIELD_RESUME_REDACT_BOOKMARK_SNAPS, &int_size, 2430 &num_redact_snaps)); 2431 ASSERT3U(int_size, ==, sizeof (uint64_t)); 2432 2433 redact_snaps = kmem_alloc(int_size * num_redact_snaps, 2434 KM_SLEEP); 2435 VERIFY0(zap_lookup(dp->dp_meta_objset, ds->ds_object, 2436 DS_FIELD_RESUME_REDACT_BOOKMARK_SNAPS, int_size, 2437 num_redact_snaps, redact_snaps)); 2438 fnvlist_add_uint64_array(token_nv, "book_redact_snaps", 2439 redact_snaps, num_redact_snaps); 2440 kmem_free(redact_snaps, int_size * num_redact_snaps); 2441 } 2442 packed = fnvlist_pack(token_nv, &packed_size); 2443 fnvlist_free(token_nv); 2444 compressed = kmem_alloc(packed_size, KM_SLEEP); 2445 2446 compressed_size = gzip_compress(packed, compressed, 2447 packed_size, packed_size, 6); 2448 2449 zio_cksum_t cksum; 2450 fletcher_4_native_varsize(compressed, compressed_size, &cksum); 2451 2452 size_t alloc_size = compressed_size * 2 + 1; 2453 str = kmem_alloc(alloc_size, KM_SLEEP); 2454 for (int i = 0; i < compressed_size; i++) { 2455 size_t offset = i * 2; 2456 (void) snprintf(str + offset, alloc_size - offset, 2457 "%02x", compressed[i]); 2458 } 2459 str[compressed_size * 2] = '\0'; 2460 char *propval = kmem_asprintf("%u-%llx-%llx-%s", 2461 ZFS_SEND_RESUME_TOKEN_VERSION, 2462 (longlong_t)cksum.zc_word[0], 2463 (longlong_t)packed_size, str); 2464 kmem_free(packed, packed_size); 2465 kmem_free(str, alloc_size); 2466 kmem_free(compressed, packed_size); 2467 return (propval); 2468 } 2469 2470 /* 2471 * Returns a string that represents the receive resume state token. It should 2472 * be freed with strfree(). NULL is returned if no resume state is present. 2473 */ 2474 char * 2475 get_receive_resume_token(dsl_dataset_t *ds) 2476 { 2477 /* 2478 * A failed "newfs" (e.g. full) resumable receive leaves 2479 * the stats set on this dataset. Check here for the prop. 2480 */ 2481 char *token = get_receive_resume_token_impl(ds); 2482 if (token != NULL) 2483 return (token); 2484 /* 2485 * A failed incremental resumable receive leaves the 2486 * stats set on our child named "%recv". Check the child 2487 * for the prop. 2488 */ 2489 /* 6 extra bytes for /%recv */ 2490 char name[ZFS_MAX_DATASET_NAME_LEN + 6]; 2491 dsl_dataset_t *recv_ds; 2492 dsl_dataset_name(ds, name); 2493 if (strlcat(name, "/", sizeof (name)) < sizeof (name) && 2494 strlcat(name, recv_clone_name, sizeof (name)) < sizeof (name) && 2495 dsl_dataset_hold(ds->ds_dir->dd_pool, name, FTAG, &recv_ds) == 0) { 2496 token = get_receive_resume_token_impl(recv_ds); 2497 dsl_dataset_rele(recv_ds, FTAG); 2498 } 2499 return (token); 2500 } 2501 2502 uint64_t 2503 dsl_get_refratio(dsl_dataset_t *ds) 2504 { 2505 uint64_t ratio = dsl_dataset_phys(ds)->ds_compressed_bytes == 0 ? 100 : 2506 (dsl_dataset_phys(ds)->ds_uncompressed_bytes * 100 / 2507 dsl_dataset_phys(ds)->ds_compressed_bytes); 2508 return (ratio); 2509 } 2510 2511 uint64_t 2512 dsl_get_logicalreferenced(dsl_dataset_t *ds) 2513 { 2514 return (dsl_dataset_phys(ds)->ds_uncompressed_bytes); 2515 } 2516 2517 uint64_t 2518 dsl_get_compressratio(dsl_dataset_t *ds) 2519 { 2520 if (ds->ds_is_snapshot) { 2521 return (dsl_get_refratio(ds)); 2522 } else { 2523 dsl_dir_t *dd = ds->ds_dir; 2524 mutex_enter(&dd->dd_lock); 2525 uint64_t val = dsl_dir_get_compressratio(dd); 2526 mutex_exit(&dd->dd_lock); 2527 return (val); 2528 } 2529 } 2530 2531 uint64_t 2532 dsl_get_used(dsl_dataset_t *ds) 2533 { 2534 if (ds->ds_is_snapshot) { 2535 return (dsl_dataset_phys(ds)->ds_unique_bytes); 2536 } else { 2537 dsl_dir_t *dd = ds->ds_dir; 2538 mutex_enter(&dd->dd_lock); 2539 uint64_t val = dsl_dir_get_used(dd); 2540 mutex_exit(&dd->dd_lock); 2541 return (val); 2542 } 2543 } 2544 2545 uint64_t 2546 dsl_get_creation(dsl_dataset_t *ds) 2547 { 2548 return (dsl_dataset_phys(ds)->ds_creation_time); 2549 } 2550 2551 uint64_t 2552 dsl_get_creationtxg(dsl_dataset_t *ds) 2553 { 2554 return (dsl_dataset_phys(ds)->ds_creation_txg); 2555 } 2556 2557 uint64_t 2558 dsl_get_refquota(dsl_dataset_t *ds) 2559 { 2560 return (ds->ds_quota); 2561 } 2562 2563 uint64_t 2564 dsl_get_refreservation(dsl_dataset_t *ds) 2565 { 2566 return (ds->ds_reserved); 2567 } 2568 2569 uint64_t 2570 dsl_get_guid(dsl_dataset_t *ds) 2571 { 2572 return (dsl_dataset_phys(ds)->ds_guid); 2573 } 2574 2575 uint64_t 2576 dsl_get_unique(dsl_dataset_t *ds) 2577 { 2578 return (dsl_dataset_phys(ds)->ds_unique_bytes); 2579 } 2580 2581 uint64_t 2582 dsl_get_objsetid(dsl_dataset_t *ds) 2583 { 2584 return (ds->ds_object); 2585 } 2586 2587 uint64_t 2588 dsl_get_userrefs(dsl_dataset_t *ds) 2589 { 2590 return (ds->ds_userrefs); 2591 } 2592 2593 uint64_t 2594 dsl_get_defer_destroy(dsl_dataset_t *ds) 2595 { 2596 return (DS_IS_DEFER_DESTROY(ds) ? 1 : 0); 2597 } 2598 2599 uint64_t 2600 dsl_get_referenced(dsl_dataset_t *ds) 2601 { 2602 return (dsl_dataset_phys(ds)->ds_referenced_bytes); 2603 } 2604 2605 uint64_t 2606 dsl_get_numclones(dsl_dataset_t *ds) 2607 { 2608 ASSERT(ds->ds_is_snapshot); 2609 return (dsl_dataset_phys(ds)->ds_num_children - 1); 2610 } 2611 2612 uint64_t 2613 dsl_get_inconsistent(dsl_dataset_t *ds) 2614 { 2615 return ((dsl_dataset_phys(ds)->ds_flags & DS_FLAG_INCONSISTENT) ? 2616 1 : 0); 2617 } 2618 2619 uint64_t 2620 dsl_get_redacted(dsl_dataset_t *ds) 2621 { 2622 return (dsl_dataset_feature_is_active(ds, 2623 SPA_FEATURE_REDACTED_DATASETS)); 2624 } 2625 2626 uint64_t 2627 dsl_get_available(dsl_dataset_t *ds) 2628 { 2629 uint64_t refdbytes = dsl_get_referenced(ds); 2630 uint64_t availbytes = dsl_dir_space_available(ds->ds_dir, 2631 NULL, 0, TRUE); 2632 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes) { 2633 availbytes += 2634 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes; 2635 } 2636 if (ds->ds_quota != 0) { 2637 /* 2638 * Adjust available bytes according to refquota 2639 */ 2640 if (refdbytes < ds->ds_quota) { 2641 availbytes = MIN(availbytes, 2642 ds->ds_quota - refdbytes); 2643 } else { 2644 availbytes = 0; 2645 } 2646 } 2647 return (availbytes); 2648 } 2649 2650 int 2651 dsl_get_written(dsl_dataset_t *ds, uint64_t *written) 2652 { 2653 dsl_pool_t *dp = ds->ds_dir->dd_pool; 2654 dsl_dataset_t *prev; 2655 int err = dsl_dataset_hold_obj(dp, 2656 dsl_dataset_phys(ds)->ds_prev_snap_obj, FTAG, &prev); 2657 if (err == 0) { 2658 uint64_t comp, uncomp; 2659 err = dsl_dataset_space_written(prev, ds, written, 2660 &comp, &uncomp); 2661 dsl_dataset_rele(prev, FTAG); 2662 } 2663 return (err); 2664 } 2665 2666 /* 2667 * 'snap' should be a buffer of size ZFS_MAX_DATASET_NAME_LEN. 2668 */ 2669 int 2670 dsl_get_prev_snap(dsl_dataset_t *ds, char *snap) 2671 { 2672 dsl_pool_t *dp = ds->ds_dir->dd_pool; 2673 if (ds->ds_prev != NULL && ds->ds_prev != dp->dp_origin_snap) { 2674 dsl_dataset_name(ds->ds_prev, snap); 2675 return (0); 2676 } else { 2677 return (SET_ERROR(ENOENT)); 2678 } 2679 } 2680 2681 void 2682 dsl_get_redact_snaps(dsl_dataset_t *ds, nvlist_t *propval) 2683 { 2684 uint64_t nsnaps; 2685 uint64_t *snaps; 2686 if (dsl_dataset_get_uint64_array_feature(ds, 2687 SPA_FEATURE_REDACTED_DATASETS, &nsnaps, &snaps)) { 2688 fnvlist_add_uint64_array(propval, ZPROP_VALUE, snaps, 2689 nsnaps); 2690 } 2691 } 2692 2693 /* 2694 * Returns the mountpoint property and source for the given dataset in the value 2695 * and source buffers. The value buffer must be at least as large as MAXPATHLEN 2696 * and the source buffer as least as large a ZFS_MAX_DATASET_NAME_LEN. 2697 * Returns 0 on success and an error on failure. 2698 */ 2699 int 2700 dsl_get_mountpoint(dsl_dataset_t *ds, const char *dsname, char *value, 2701 char *source) 2702 { 2703 int error; 2704 dsl_pool_t *dp = ds->ds_dir->dd_pool; 2705 2706 /* Retrieve the mountpoint value stored in the zap object */ 2707 error = dsl_prop_get_ds(ds, zfs_prop_to_name(ZFS_PROP_MOUNTPOINT), 1, 2708 ZAP_MAXVALUELEN, value, source); 2709 if (error != 0) { 2710 return (error); 2711 } 2712 2713 /* 2714 * Process the dsname and source to find the full mountpoint string. 2715 * Can be skipped for 'legacy' or 'none'. 2716 */ 2717 if (value[0] == '/') { 2718 char *buf = kmem_alloc(ZAP_MAXVALUELEN, KM_SLEEP); 2719 char *root = buf; 2720 const char *relpath; 2721 2722 /* 2723 * If we inherit the mountpoint, even from a dataset 2724 * with a received value, the source will be the path of 2725 * the dataset we inherit from. If source is 2726 * ZPROP_SOURCE_VAL_RECVD, the received value is not 2727 * inherited. 2728 */ 2729 if (strcmp(source, ZPROP_SOURCE_VAL_RECVD) == 0) { 2730 relpath = ""; 2731 } else { 2732 ASSERT0(strncmp(dsname, source, strlen(source))); 2733 relpath = dsname + strlen(source); 2734 if (relpath[0] == '/') 2735 relpath++; 2736 } 2737 2738 spa_altroot(dp->dp_spa, root, ZAP_MAXVALUELEN); 2739 2740 /* 2741 * Special case an alternate root of '/'. This will 2742 * avoid having multiple leading slashes in the 2743 * mountpoint path. 2744 */ 2745 if (strcmp(root, "/") == 0) 2746 root++; 2747 2748 /* 2749 * If the mountpoint is '/' then skip over this 2750 * if we are obtaining either an alternate root or 2751 * an inherited mountpoint. 2752 */ 2753 char *mnt = value; 2754 if (value[1] == '\0' && (root[0] != '\0' || 2755 relpath[0] != '\0')) 2756 mnt = value + 1; 2757 2758 mnt = kmem_strdup(mnt); 2759 2760 if (relpath[0] == '\0') { 2761 (void) snprintf(value, ZAP_MAXVALUELEN, "%s%s", 2762 root, mnt); 2763 } else { 2764 (void) snprintf(value, ZAP_MAXVALUELEN, "%s%s%s%s", 2765 root, mnt, relpath[0] == '@' ? "" : "/", 2766 relpath); 2767 } 2768 kmem_free(buf, ZAP_MAXVALUELEN); 2769 kmem_strfree(mnt); 2770 } 2771 2772 return (0); 2773 } 2774 2775 void 2776 dsl_dataset_stats(dsl_dataset_t *ds, nvlist_t *nv) 2777 { 2778 dsl_pool_t *dp __maybe_unused = ds->ds_dir->dd_pool; 2779 2780 ASSERT(dsl_pool_config_held(dp)); 2781 2782 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRATIO, 2783 dsl_get_refratio(ds)); 2784 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_LOGICALREFERENCED, 2785 dsl_get_logicalreferenced(ds)); 2786 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_COMPRESSRATIO, 2787 dsl_get_compressratio(ds)); 2788 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USED, 2789 dsl_get_used(ds)); 2790 2791 if (ds->ds_is_snapshot) { 2792 get_clones_stat(ds, nv); 2793 } else { 2794 char buf[ZFS_MAX_DATASET_NAME_LEN]; 2795 if (dsl_get_prev_snap(ds, buf) == 0) 2796 dsl_prop_nvlist_add_string(nv, ZFS_PROP_PREV_SNAP, 2797 buf); 2798 dsl_dir_stats(ds->ds_dir, nv); 2799 } 2800 2801 nvlist_t *propval = fnvlist_alloc(); 2802 dsl_get_redact_snaps(ds, propval); 2803 fnvlist_add_nvlist(nv, zfs_prop_to_name(ZFS_PROP_REDACT_SNAPS), 2804 propval); 2805 nvlist_free(propval); 2806 2807 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_AVAILABLE, 2808 dsl_get_available(ds)); 2809 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFERENCED, 2810 dsl_get_referenced(ds)); 2811 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATION, 2812 dsl_get_creation(ds)); 2813 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATETXG, 2814 dsl_get_creationtxg(ds)); 2815 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFQUOTA, 2816 dsl_get_refquota(ds)); 2817 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRESERVATION, 2818 dsl_get_refreservation(ds)); 2819 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_GUID, 2820 dsl_get_guid(ds)); 2821 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_UNIQUE, 2822 dsl_get_unique(ds)); 2823 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_OBJSETID, 2824 dsl_get_objsetid(ds)); 2825 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USERREFS, 2826 dsl_get_userrefs(ds)); 2827 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_DEFER_DESTROY, 2828 dsl_get_defer_destroy(ds)); 2829 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_SNAPSHOTS_CHANGED, 2830 dsl_dir_snap_cmtime(ds->ds_dir).tv_sec); 2831 dsl_dataset_crypt_stats(ds, nv); 2832 2833 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) { 2834 uint64_t written; 2835 if (dsl_get_written(ds, &written) == 0) { 2836 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_WRITTEN, 2837 written); 2838 } 2839 } 2840 2841 if (!dsl_dataset_is_snapshot(ds)) { 2842 char *token = get_receive_resume_token(ds); 2843 if (token != NULL) { 2844 dsl_prop_nvlist_add_string(nv, 2845 ZFS_PROP_RECEIVE_RESUME_TOKEN, token); 2846 kmem_strfree(token); 2847 } 2848 } 2849 } 2850 2851 void 2852 dsl_dataset_fast_stat(dsl_dataset_t *ds, dmu_objset_stats_t *stat) 2853 { 2854 dsl_pool_t *dp __maybe_unused = ds->ds_dir->dd_pool; 2855 ASSERT(dsl_pool_config_held(dp)); 2856 2857 stat->dds_creation_txg = dsl_get_creationtxg(ds); 2858 stat->dds_inconsistent = dsl_get_inconsistent(ds); 2859 stat->dds_guid = dsl_get_guid(ds); 2860 stat->dds_redacted = dsl_get_redacted(ds); 2861 stat->dds_origin[0] = '\0'; 2862 if (ds->ds_is_snapshot) { 2863 stat->dds_is_snapshot = B_TRUE; 2864 stat->dds_num_clones = dsl_get_numclones(ds); 2865 } else { 2866 stat->dds_is_snapshot = B_FALSE; 2867 stat->dds_num_clones = 0; 2868 2869 if (dsl_dir_is_clone(ds->ds_dir)) { 2870 dsl_dir_get_origin(ds->ds_dir, stat->dds_origin); 2871 } 2872 } 2873 } 2874 2875 uint64_t 2876 dsl_dataset_fsid_guid(dsl_dataset_t *ds) 2877 { 2878 return (ds->ds_fsid_guid); 2879 } 2880 2881 void 2882 dsl_dataset_space(dsl_dataset_t *ds, 2883 uint64_t *refdbytesp, uint64_t *availbytesp, 2884 uint64_t *usedobjsp, uint64_t *availobjsp) 2885 { 2886 *refdbytesp = dsl_dataset_phys(ds)->ds_referenced_bytes; 2887 *availbytesp = dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE); 2888 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes) 2889 *availbytesp += 2890 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes; 2891 if (ds->ds_quota != 0) { 2892 /* 2893 * Adjust available bytes according to refquota 2894 */ 2895 if (*refdbytesp < ds->ds_quota) 2896 *availbytesp = MIN(*availbytesp, 2897 ds->ds_quota - *refdbytesp); 2898 else 2899 *availbytesp = 0; 2900 } 2901 rrw_enter(&ds->ds_bp_rwlock, RW_READER, FTAG); 2902 *usedobjsp = BP_GET_FILL(&dsl_dataset_phys(ds)->ds_bp); 2903 rrw_exit(&ds->ds_bp_rwlock, FTAG); 2904 *availobjsp = DN_MAX_OBJECT - *usedobjsp; 2905 } 2906 2907 boolean_t 2908 dsl_dataset_modified_since_snap(dsl_dataset_t *ds, dsl_dataset_t *snap) 2909 { 2910 dsl_pool_t *dp __maybe_unused = ds->ds_dir->dd_pool; 2911 uint64_t birth; 2912 2913 ASSERT(dsl_pool_config_held(dp)); 2914 if (snap == NULL) 2915 return (B_FALSE); 2916 rrw_enter(&ds->ds_bp_rwlock, RW_READER, FTAG); 2917 birth = dsl_dataset_get_blkptr(ds)->blk_birth; 2918 rrw_exit(&ds->ds_bp_rwlock, FTAG); 2919 if (birth > dsl_dataset_phys(snap)->ds_creation_txg) { 2920 objset_t *os, *os_snap; 2921 /* 2922 * It may be that only the ZIL differs, because it was 2923 * reset in the head. Don't count that as being 2924 * modified. 2925 */ 2926 if (dmu_objset_from_ds(ds, &os) != 0) 2927 return (B_TRUE); 2928 if (dmu_objset_from_ds(snap, &os_snap) != 0) 2929 return (B_TRUE); 2930 return (memcmp(&os->os_phys->os_meta_dnode, 2931 &os_snap->os_phys->os_meta_dnode, 2932 sizeof (os->os_phys->os_meta_dnode)) != 0); 2933 } 2934 return (B_FALSE); 2935 } 2936 2937 static int 2938 dsl_dataset_rename_snapshot_check_impl(dsl_pool_t *dp, 2939 dsl_dataset_t *hds, void *arg) 2940 { 2941 (void) dp; 2942 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 2943 int error; 2944 uint64_t val; 2945 2946 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val); 2947 if (error != 0) { 2948 /* ignore nonexistent snapshots */ 2949 return (error == ENOENT ? 0 : error); 2950 } 2951 2952 /* new name should not exist */ 2953 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_newsnapname, &val); 2954 if (error == 0) 2955 error = SET_ERROR(EEXIST); 2956 else if (error == ENOENT) 2957 error = 0; 2958 2959 /* dataset name + 1 for the "@" + the new snapshot name must fit */ 2960 if (dsl_dir_namelen(hds->ds_dir) + 1 + 2961 strlen(ddrsa->ddrsa_newsnapname) >= ZFS_MAX_DATASET_NAME_LEN) 2962 error = SET_ERROR(ENAMETOOLONG); 2963 2964 return (error); 2965 } 2966 2967 int 2968 dsl_dataset_rename_snapshot_check(void *arg, dmu_tx_t *tx) 2969 { 2970 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 2971 dsl_pool_t *dp = dmu_tx_pool(tx); 2972 dsl_dataset_t *hds; 2973 int error; 2974 2975 error = dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds); 2976 if (error != 0) 2977 return (error); 2978 2979 if (ddrsa->ddrsa_recursive) { 2980 error = dmu_objset_find_dp(dp, hds->ds_dir->dd_object, 2981 dsl_dataset_rename_snapshot_check_impl, ddrsa, 2982 DS_FIND_CHILDREN); 2983 } else { 2984 error = dsl_dataset_rename_snapshot_check_impl(dp, hds, ddrsa); 2985 } 2986 dsl_dataset_rele(hds, FTAG); 2987 return (error); 2988 } 2989 2990 static int 2991 dsl_dataset_rename_snapshot_sync_impl(dsl_pool_t *dp, 2992 dsl_dataset_t *hds, void *arg) 2993 { 2994 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 2995 dsl_dataset_t *ds; 2996 uint64_t val; 2997 dmu_tx_t *tx = ddrsa->ddrsa_tx; 2998 int error; 2999 3000 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val); 3001 ASSERT(error == 0 || error == ENOENT); 3002 if (error == ENOENT) { 3003 /* ignore nonexistent snapshots */ 3004 return (0); 3005 } 3006 3007 VERIFY0(dsl_dataset_hold_obj(dp, val, FTAG, &ds)); 3008 3009 /* log before we change the name */ 3010 spa_history_log_internal_ds(ds, "rename", tx, 3011 "-> @%s", ddrsa->ddrsa_newsnapname); 3012 3013 VERIFY0(dsl_dataset_snap_remove(hds, ddrsa->ddrsa_oldsnapname, tx, 3014 B_FALSE)); 3015 mutex_enter(&ds->ds_lock); 3016 (void) strlcpy(ds->ds_snapname, ddrsa->ddrsa_newsnapname, 3017 sizeof (ds->ds_snapname)); 3018 mutex_exit(&ds->ds_lock); 3019 VERIFY0(zap_add(dp->dp_meta_objset, 3020 dsl_dataset_phys(hds)->ds_snapnames_zapobj, 3021 ds->ds_snapname, 8, 1, &ds->ds_object, tx)); 3022 zvol_rename_minors(dp->dp_spa, ddrsa->ddrsa_oldsnapname, 3023 ddrsa->ddrsa_newsnapname, B_TRUE); 3024 3025 dsl_dataset_rele(ds, FTAG); 3026 return (0); 3027 } 3028 3029 void 3030 dsl_dataset_rename_snapshot_sync(void *arg, dmu_tx_t *tx) 3031 { 3032 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 3033 dsl_pool_t *dp = dmu_tx_pool(tx); 3034 dsl_dataset_t *hds = NULL; 3035 3036 VERIFY0(dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds)); 3037 ddrsa->ddrsa_tx = tx; 3038 if (ddrsa->ddrsa_recursive) { 3039 VERIFY0(dmu_objset_find_dp(dp, hds->ds_dir->dd_object, 3040 dsl_dataset_rename_snapshot_sync_impl, ddrsa, 3041 DS_FIND_CHILDREN)); 3042 } else { 3043 VERIFY0(dsl_dataset_rename_snapshot_sync_impl(dp, hds, ddrsa)); 3044 } 3045 dsl_dataset_rele(hds, FTAG); 3046 } 3047 3048 int 3049 dsl_dataset_rename_snapshot(const char *fsname, 3050 const char *oldsnapname, const char *newsnapname, boolean_t recursive) 3051 { 3052 dsl_dataset_rename_snapshot_arg_t ddrsa; 3053 3054 ddrsa.ddrsa_fsname = fsname; 3055 ddrsa.ddrsa_oldsnapname = oldsnapname; 3056 ddrsa.ddrsa_newsnapname = newsnapname; 3057 ddrsa.ddrsa_recursive = recursive; 3058 3059 return (dsl_sync_task(fsname, dsl_dataset_rename_snapshot_check, 3060 dsl_dataset_rename_snapshot_sync, &ddrsa, 3061 1, ZFS_SPACE_CHECK_RESERVED)); 3062 } 3063 3064 /* 3065 * If we're doing an ownership handoff, we need to make sure that there is 3066 * only one long hold on the dataset. We're not allowed to change anything here 3067 * so we don't permanently release the long hold or regular hold here. We want 3068 * to do this only when syncing to avoid the dataset unexpectedly going away 3069 * when we release the long hold. 3070 */ 3071 static int 3072 dsl_dataset_handoff_check(dsl_dataset_t *ds, void *owner, dmu_tx_t *tx) 3073 { 3074 boolean_t held = B_FALSE; 3075 3076 if (!dmu_tx_is_syncing(tx)) 3077 return (0); 3078 3079 dsl_dir_t *dd = ds->ds_dir; 3080 mutex_enter(&dd->dd_activity_lock); 3081 uint64_t holds = zfs_refcount_count(&ds->ds_longholds) - 3082 (owner != NULL ? 1 : 0); 3083 /* 3084 * The value of dd_activity_waiters can chance as soon as we drop the 3085 * lock, but we're fine with that; new waiters coming in or old 3086 * waiters leaving doesn't cause problems, since we're going to cancel 3087 * waiters later anyway. The goal of this check is to verify that no 3088 * non-waiters have long-holds, and all new long-holds will be 3089 * prevented because we're holding the pool config as writer. 3090 */ 3091 if (holds != dd->dd_activity_waiters) 3092 held = B_TRUE; 3093 mutex_exit(&dd->dd_activity_lock); 3094 3095 if (held) 3096 return (SET_ERROR(EBUSY)); 3097 3098 return (0); 3099 } 3100 3101 int 3102 dsl_dataset_rollback_check(void *arg, dmu_tx_t *tx) 3103 { 3104 dsl_dataset_rollback_arg_t *ddra = arg; 3105 dsl_pool_t *dp = dmu_tx_pool(tx); 3106 dsl_dataset_t *ds; 3107 int64_t unused_refres_delta; 3108 int error; 3109 3110 error = dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds); 3111 if (error != 0) 3112 return (error); 3113 3114 /* must not be a snapshot */ 3115 if (ds->ds_is_snapshot) { 3116 dsl_dataset_rele(ds, FTAG); 3117 return (SET_ERROR(EINVAL)); 3118 } 3119 3120 /* must have a most recent snapshot */ 3121 if (dsl_dataset_phys(ds)->ds_prev_snap_txg < TXG_INITIAL) { 3122 dsl_dataset_rele(ds, FTAG); 3123 return (SET_ERROR(ESRCH)); 3124 } 3125 3126 /* 3127 * No rollback to a snapshot created in the current txg, because 3128 * the rollback may dirty the dataset and create blocks that are 3129 * not reachable from the rootbp while having a birth txg that 3130 * falls into the snapshot's range. 3131 */ 3132 if (dmu_tx_is_syncing(tx) && 3133 dsl_dataset_phys(ds)->ds_prev_snap_txg >= tx->tx_txg) { 3134 dsl_dataset_rele(ds, FTAG); 3135 return (SET_ERROR(EAGAIN)); 3136 } 3137 3138 /* 3139 * If the expected target snapshot is specified, then check that 3140 * the latest snapshot is it. 3141 */ 3142 if (ddra->ddra_tosnap != NULL) { 3143 dsl_dataset_t *snapds; 3144 3145 /* Check if the target snapshot exists at all. */ 3146 error = dsl_dataset_hold(dp, ddra->ddra_tosnap, FTAG, &snapds); 3147 if (error != 0) { 3148 /* 3149 * ESRCH is used to signal that the target snapshot does 3150 * not exist, while ENOENT is used to report that 3151 * the rolled back dataset does not exist. 3152 * ESRCH is also used to cover other cases where the 3153 * target snapshot is not related to the dataset being 3154 * rolled back such as being in a different pool. 3155 */ 3156 if (error == ENOENT || error == EXDEV) 3157 error = SET_ERROR(ESRCH); 3158 dsl_dataset_rele(ds, FTAG); 3159 return (error); 3160 } 3161 ASSERT(snapds->ds_is_snapshot); 3162 3163 /* Check if the snapshot is the latest snapshot indeed. */ 3164 if (snapds != ds->ds_prev) { 3165 /* 3166 * Distinguish between the case where the only problem 3167 * is intervening snapshots (EEXIST) vs the snapshot 3168 * not being a valid target for rollback (ESRCH). 3169 */ 3170 if (snapds->ds_dir == ds->ds_dir || 3171 (dsl_dir_is_clone(ds->ds_dir) && 3172 dsl_dir_phys(ds->ds_dir)->dd_origin_obj == 3173 snapds->ds_object)) { 3174 error = SET_ERROR(EEXIST); 3175 } else { 3176 error = SET_ERROR(ESRCH); 3177 } 3178 dsl_dataset_rele(snapds, FTAG); 3179 dsl_dataset_rele(ds, FTAG); 3180 return (error); 3181 } 3182 dsl_dataset_rele(snapds, FTAG); 3183 } 3184 3185 /* must not have any bookmarks after the most recent snapshot */ 3186 if (dsl_bookmark_latest_txg(ds) > 3187 dsl_dataset_phys(ds)->ds_prev_snap_txg) { 3188 dsl_dataset_rele(ds, FTAG); 3189 return (SET_ERROR(EEXIST)); 3190 } 3191 3192 error = dsl_dataset_handoff_check(ds, ddra->ddra_owner, tx); 3193 if (error != 0) { 3194 dsl_dataset_rele(ds, FTAG); 3195 return (error); 3196 } 3197 3198 /* 3199 * Check if the snap we are rolling back to uses more than 3200 * the refquota. 3201 */ 3202 if (ds->ds_quota != 0 && 3203 dsl_dataset_phys(ds->ds_prev)->ds_referenced_bytes > ds->ds_quota) { 3204 dsl_dataset_rele(ds, FTAG); 3205 return (SET_ERROR(EDQUOT)); 3206 } 3207 3208 /* 3209 * When we do the clone swap, we will temporarily use more space 3210 * due to the refreservation (the head will no longer have any 3211 * unique space, so the entire amount of the refreservation will need 3212 * to be free). We will immediately destroy the clone, freeing 3213 * this space, but the freeing happens over many txg's. 3214 */ 3215 unused_refres_delta = (int64_t)MIN(ds->ds_reserved, 3216 dsl_dataset_phys(ds)->ds_unique_bytes); 3217 3218 if (unused_refres_delta > 0 && 3219 unused_refres_delta > 3220 dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE)) { 3221 dsl_dataset_rele(ds, FTAG); 3222 return (SET_ERROR(ENOSPC)); 3223 } 3224 3225 dsl_dataset_rele(ds, FTAG); 3226 return (0); 3227 } 3228 3229 void 3230 dsl_dataset_rollback_sync(void *arg, dmu_tx_t *tx) 3231 { 3232 dsl_dataset_rollback_arg_t *ddra = arg; 3233 dsl_pool_t *dp = dmu_tx_pool(tx); 3234 dsl_dataset_t *ds, *clone; 3235 uint64_t cloneobj; 3236 char namebuf[ZFS_MAX_DATASET_NAME_LEN]; 3237 3238 VERIFY0(dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds)); 3239 3240 dsl_dataset_name(ds->ds_prev, namebuf); 3241 fnvlist_add_string(ddra->ddra_result, "target", namebuf); 3242 3243 cloneobj = dsl_dataset_create_sync(ds->ds_dir, "%rollback", 3244 ds->ds_prev, DS_CREATE_FLAG_NODIRTY, kcred, NULL, tx); 3245 3246 VERIFY0(dsl_dataset_hold_obj(dp, cloneobj, FTAG, &clone)); 3247 3248 dsl_dataset_clone_swap_sync_impl(clone, ds, tx); 3249 dsl_dataset_zero_zil(ds, tx); 3250 3251 dsl_destroy_head_sync_impl(clone, tx); 3252 3253 dsl_dataset_rele(clone, FTAG); 3254 dsl_dataset_rele(ds, FTAG); 3255 } 3256 3257 /* 3258 * Rolls back the given filesystem or volume to the most recent snapshot. 3259 * The name of the most recent snapshot will be returned under key "target" 3260 * in the result nvlist. 3261 * 3262 * If owner != NULL: 3263 * - The existing dataset MUST be owned by the specified owner at entry 3264 * - Upon return, dataset will still be held by the same owner, whether we 3265 * succeed or not. 3266 * 3267 * This mode is required any time the existing filesystem is mounted. See 3268 * notes above zfs_suspend_fs() for further details. 3269 */ 3270 int 3271 dsl_dataset_rollback(const char *fsname, const char *tosnap, void *owner, 3272 nvlist_t *result) 3273 { 3274 dsl_dataset_rollback_arg_t ddra; 3275 3276 ddra.ddra_fsname = fsname; 3277 ddra.ddra_tosnap = tosnap; 3278 ddra.ddra_owner = owner; 3279 ddra.ddra_result = result; 3280 3281 return (dsl_sync_task(fsname, dsl_dataset_rollback_check, 3282 dsl_dataset_rollback_sync, &ddra, 3283 1, ZFS_SPACE_CHECK_RESERVED)); 3284 } 3285 3286 struct promotenode { 3287 list_node_t link; 3288 dsl_dataset_t *ds; 3289 }; 3290 3291 static int snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep); 3292 static int promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp, 3293 const void *tag); 3294 static void promote_rele(dsl_dataset_promote_arg_t *ddpa, const void *tag); 3295 3296 int 3297 dsl_dataset_promote_check(void *arg, dmu_tx_t *tx) 3298 { 3299 dsl_dataset_promote_arg_t *ddpa = arg; 3300 dsl_pool_t *dp = dmu_tx_pool(tx); 3301 dsl_dataset_t *hds; 3302 struct promotenode *snap; 3303 int err; 3304 uint64_t unused; 3305 uint64_t ss_mv_cnt; 3306 size_t max_snap_len; 3307 boolean_t conflicting_snaps; 3308 3309 err = promote_hold(ddpa, dp, FTAG); 3310 if (err != 0) 3311 return (err); 3312 3313 hds = ddpa->ddpa_clone; 3314 max_snap_len = MAXNAMELEN - strlen(ddpa->ddpa_clonename) - 1; 3315 3316 if (dsl_dataset_phys(hds)->ds_flags & DS_FLAG_NOPROMOTE) { 3317 promote_rele(ddpa, FTAG); 3318 return (SET_ERROR(EXDEV)); 3319 } 3320 3321 snap = list_head(&ddpa->shared_snaps); 3322 if (snap == NULL) { 3323 err = SET_ERROR(ENOENT); 3324 goto out; 3325 } 3326 dsl_dataset_t *const origin_ds = snap->ds; 3327 3328 /* 3329 * Encrypted clones share a DSL Crypto Key with their origin's dsl dir. 3330 * When doing a promote we must make sure the encryption root for 3331 * both the target and the target's origin does not change to avoid 3332 * needing to rewrap encryption keys 3333 */ 3334 err = dsl_dataset_promote_crypt_check(hds->ds_dir, origin_ds->ds_dir); 3335 if (err != 0) 3336 goto out; 3337 3338 /* 3339 * Compute and check the amount of space to transfer. Since this is 3340 * so expensive, don't do the preliminary check. 3341 */ 3342 if (!dmu_tx_is_syncing(tx)) { 3343 promote_rele(ddpa, FTAG); 3344 return (0); 3345 } 3346 3347 /* compute origin's new unique space */ 3348 snap = list_tail(&ddpa->clone_snaps); 3349 ASSERT(snap != NULL); 3350 ASSERT3U(dsl_dataset_phys(snap->ds)->ds_prev_snap_obj, ==, 3351 origin_ds->ds_object); 3352 dsl_deadlist_space_range(&snap->ds->ds_deadlist, 3353 dsl_dataset_phys(origin_ds)->ds_prev_snap_txg, UINT64_MAX, 3354 &ddpa->unique, &unused, &unused); 3355 3356 /* 3357 * Walk the snapshots that we are moving 3358 * 3359 * Compute space to transfer. Consider the incremental changes 3360 * to used by each snapshot: 3361 * (my used) = (prev's used) + (blocks born) - (blocks killed) 3362 * So each snapshot gave birth to: 3363 * (blocks born) = (my used) - (prev's used) + (blocks killed) 3364 * So a sequence would look like: 3365 * (uN - u(N-1) + kN) + ... + (u1 - u0 + k1) + (u0 - 0 + k0) 3366 * Which simplifies to: 3367 * uN + kN + kN-1 + ... + k1 + k0 3368 * Note however, if we stop before we reach the ORIGIN we get: 3369 * uN + kN + kN-1 + ... + kM - uM-1 3370 */ 3371 conflicting_snaps = B_FALSE; 3372 ss_mv_cnt = 0; 3373 ddpa->used = dsl_dataset_phys(origin_ds)->ds_referenced_bytes; 3374 ddpa->comp = dsl_dataset_phys(origin_ds)->ds_compressed_bytes; 3375 ddpa->uncomp = dsl_dataset_phys(origin_ds)->ds_uncompressed_bytes; 3376 for (snap = list_head(&ddpa->shared_snaps); snap; 3377 snap = list_next(&ddpa->shared_snaps, snap)) { 3378 uint64_t val, dlused, dlcomp, dluncomp; 3379 dsl_dataset_t *ds = snap->ds; 3380 3381 ss_mv_cnt++; 3382 3383 /* 3384 * If there are long holds, we won't be able to evict 3385 * the objset. 3386 */ 3387 if (dsl_dataset_long_held(ds)) { 3388 err = SET_ERROR(EBUSY); 3389 goto out; 3390 } 3391 3392 /* Check that the snapshot name does not conflict */ 3393 VERIFY0(dsl_dataset_get_snapname(ds)); 3394 if (strlen(ds->ds_snapname) >= max_snap_len) { 3395 err = SET_ERROR(ENAMETOOLONG); 3396 goto out; 3397 } 3398 err = dsl_dataset_snap_lookup(hds, ds->ds_snapname, &val); 3399 if (err == 0) { 3400 fnvlist_add_boolean(ddpa->err_ds, 3401 snap->ds->ds_snapname); 3402 conflicting_snaps = B_TRUE; 3403 } else if (err != ENOENT) { 3404 goto out; 3405 } 3406 3407 /* The very first snapshot does not have a deadlist */ 3408 if (dsl_dataset_phys(ds)->ds_prev_snap_obj == 0) 3409 continue; 3410 3411 dsl_deadlist_space(&ds->ds_deadlist, 3412 &dlused, &dlcomp, &dluncomp); 3413 ddpa->used += dlused; 3414 ddpa->comp += dlcomp; 3415 ddpa->uncomp += dluncomp; 3416 } 3417 3418 /* 3419 * Check that bookmarks that are being transferred don't have 3420 * name conflicts. 3421 */ 3422 for (dsl_bookmark_node_t *dbn = avl_first(&origin_ds->ds_bookmarks); 3423 dbn != NULL && dbn->dbn_phys.zbm_creation_txg <= 3424 dsl_dataset_phys(origin_ds)->ds_creation_txg; 3425 dbn = AVL_NEXT(&origin_ds->ds_bookmarks, dbn)) { 3426 if (strlen(dbn->dbn_name) >= max_snap_len) { 3427 err = SET_ERROR(ENAMETOOLONG); 3428 goto out; 3429 } 3430 zfs_bookmark_phys_t bm; 3431 err = dsl_bookmark_lookup_impl(ddpa->ddpa_clone, 3432 dbn->dbn_name, &bm); 3433 3434 if (err == 0) { 3435 fnvlist_add_boolean(ddpa->err_ds, dbn->dbn_name); 3436 conflicting_snaps = B_TRUE; 3437 } else if (err == ESRCH) { 3438 err = 0; 3439 } 3440 if (err != 0) { 3441 goto out; 3442 } 3443 } 3444 3445 /* 3446 * In order to return the full list of conflicting snapshots, we check 3447 * whether there was a conflict after traversing all of them. 3448 */ 3449 if (conflicting_snaps) { 3450 err = SET_ERROR(EEXIST); 3451 goto out; 3452 } 3453 3454 /* 3455 * If we are a clone of a clone then we never reached ORIGIN, 3456 * so we need to subtract out the clone origin's used space. 3457 */ 3458 if (ddpa->origin_origin) { 3459 ddpa->used -= 3460 dsl_dataset_phys(ddpa->origin_origin)->ds_referenced_bytes; 3461 ddpa->comp -= 3462 dsl_dataset_phys(ddpa->origin_origin)->ds_compressed_bytes; 3463 ddpa->uncomp -= 3464 dsl_dataset_phys(ddpa->origin_origin)-> 3465 ds_uncompressed_bytes; 3466 } 3467 3468 /* Check that there is enough space and limit headroom here */ 3469 err = dsl_dir_transfer_possible(origin_ds->ds_dir, hds->ds_dir, 3470 0, ss_mv_cnt, ddpa->used, ddpa->cr, ddpa->proc); 3471 if (err != 0) 3472 goto out; 3473 3474 /* 3475 * Compute the amounts of space that will be used by snapshots 3476 * after the promotion (for both origin and clone). For each, 3477 * it is the amount of space that will be on all of their 3478 * deadlists (that was not born before their new origin). 3479 */ 3480 if (dsl_dir_phys(hds->ds_dir)->dd_flags & DD_FLAG_USED_BREAKDOWN) { 3481 uint64_t space; 3482 3483 /* 3484 * Note, typically this will not be a clone of a clone, 3485 * so dd_origin_txg will be < TXG_INITIAL, so 3486 * these snaplist_space() -> dsl_deadlist_space_range() 3487 * calls will be fast because they do not have to 3488 * iterate over all bps. 3489 */ 3490 snap = list_head(&ddpa->origin_snaps); 3491 if (snap == NULL) { 3492 err = SET_ERROR(ENOENT); 3493 goto out; 3494 } 3495 err = snaplist_space(&ddpa->shared_snaps, 3496 snap->ds->ds_dir->dd_origin_txg, &ddpa->cloneusedsnap); 3497 if (err != 0) 3498 goto out; 3499 3500 err = snaplist_space(&ddpa->clone_snaps, 3501 snap->ds->ds_dir->dd_origin_txg, &space); 3502 if (err != 0) 3503 goto out; 3504 ddpa->cloneusedsnap += space; 3505 } 3506 if (dsl_dir_phys(origin_ds->ds_dir)->dd_flags & 3507 DD_FLAG_USED_BREAKDOWN) { 3508 err = snaplist_space(&ddpa->origin_snaps, 3509 dsl_dataset_phys(origin_ds)->ds_creation_txg, 3510 &ddpa->originusedsnap); 3511 if (err != 0) 3512 goto out; 3513 } 3514 3515 out: 3516 promote_rele(ddpa, FTAG); 3517 return (err); 3518 } 3519 3520 void 3521 dsl_dataset_promote_sync(void *arg, dmu_tx_t *tx) 3522 { 3523 dsl_dataset_promote_arg_t *ddpa = arg; 3524 dsl_pool_t *dp = dmu_tx_pool(tx); 3525 dsl_dataset_t *hds; 3526 struct promotenode *snap; 3527 dsl_dataset_t *origin_ds; 3528 dsl_dataset_t *origin_head; 3529 dsl_dir_t *dd; 3530 dsl_dir_t *odd = NULL; 3531 uint64_t oldnext_obj; 3532 int64_t delta; 3533 3534 ASSERT(nvlist_empty(ddpa->err_ds)); 3535 3536 VERIFY0(promote_hold(ddpa, dp, FTAG)); 3537 hds = ddpa->ddpa_clone; 3538 3539 ASSERT0(dsl_dataset_phys(hds)->ds_flags & DS_FLAG_NOPROMOTE); 3540 3541 snap = list_head(&ddpa->shared_snaps); 3542 origin_ds = snap->ds; 3543 dd = hds->ds_dir; 3544 3545 snap = list_head(&ddpa->origin_snaps); 3546 origin_head = snap->ds; 3547 3548 /* 3549 * We need to explicitly open odd, since origin_ds's dd will be 3550 * changing. 3551 */ 3552 VERIFY0(dsl_dir_hold_obj(dp, origin_ds->ds_dir->dd_object, 3553 NULL, FTAG, &odd)); 3554 3555 dsl_dataset_promote_crypt_sync(hds->ds_dir, odd, tx); 3556 3557 /* change origin's next snap */ 3558 dmu_buf_will_dirty(origin_ds->ds_dbuf, tx); 3559 oldnext_obj = dsl_dataset_phys(origin_ds)->ds_next_snap_obj; 3560 snap = list_tail(&ddpa->clone_snaps); 3561 ASSERT3U(dsl_dataset_phys(snap->ds)->ds_prev_snap_obj, ==, 3562 origin_ds->ds_object); 3563 dsl_dataset_phys(origin_ds)->ds_next_snap_obj = snap->ds->ds_object; 3564 3565 /* change the origin's next clone */ 3566 if (dsl_dataset_phys(origin_ds)->ds_next_clones_obj) { 3567 dsl_dataset_remove_from_next_clones(origin_ds, 3568 snap->ds->ds_object, tx); 3569 VERIFY0(zap_add_int(dp->dp_meta_objset, 3570 dsl_dataset_phys(origin_ds)->ds_next_clones_obj, 3571 oldnext_obj, tx)); 3572 } 3573 3574 /* change origin */ 3575 dmu_buf_will_dirty(dd->dd_dbuf, tx); 3576 ASSERT3U(dsl_dir_phys(dd)->dd_origin_obj, ==, origin_ds->ds_object); 3577 dsl_dir_phys(dd)->dd_origin_obj = dsl_dir_phys(odd)->dd_origin_obj; 3578 dd->dd_origin_txg = origin_head->ds_dir->dd_origin_txg; 3579 dmu_buf_will_dirty(odd->dd_dbuf, tx); 3580 dsl_dir_phys(odd)->dd_origin_obj = origin_ds->ds_object; 3581 origin_head->ds_dir->dd_origin_txg = 3582 dsl_dataset_phys(origin_ds)->ds_creation_txg; 3583 3584 /* change dd_clone entries */ 3585 if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 3586 VERIFY0(zap_remove_int(dp->dp_meta_objset, 3587 dsl_dir_phys(odd)->dd_clones, hds->ds_object, tx)); 3588 VERIFY0(zap_add_int(dp->dp_meta_objset, 3589 dsl_dir_phys(ddpa->origin_origin->ds_dir)->dd_clones, 3590 hds->ds_object, tx)); 3591 3592 VERIFY0(zap_remove_int(dp->dp_meta_objset, 3593 dsl_dir_phys(ddpa->origin_origin->ds_dir)->dd_clones, 3594 origin_head->ds_object, tx)); 3595 if (dsl_dir_phys(dd)->dd_clones == 0) { 3596 dsl_dir_phys(dd)->dd_clones = 3597 zap_create(dp->dp_meta_objset, DMU_OT_DSL_CLONES, 3598 DMU_OT_NONE, 0, tx); 3599 } 3600 VERIFY0(zap_add_int(dp->dp_meta_objset, 3601 dsl_dir_phys(dd)->dd_clones, origin_head->ds_object, tx)); 3602 } 3603 3604 /* 3605 * Move bookmarks to this dir. 3606 */ 3607 dsl_bookmark_node_t *dbn_next; 3608 for (dsl_bookmark_node_t *dbn = avl_first(&origin_head->ds_bookmarks); 3609 dbn != NULL && dbn->dbn_phys.zbm_creation_txg <= 3610 dsl_dataset_phys(origin_ds)->ds_creation_txg; 3611 dbn = dbn_next) { 3612 dbn_next = AVL_NEXT(&origin_head->ds_bookmarks, dbn); 3613 3614 avl_remove(&origin_head->ds_bookmarks, dbn); 3615 VERIFY0(zap_remove(dp->dp_meta_objset, 3616 origin_head->ds_bookmarks_obj, dbn->dbn_name, tx)); 3617 3618 dsl_bookmark_node_add(hds, dbn, tx); 3619 } 3620 3621 dsl_bookmark_next_changed(hds, origin_ds, tx); 3622 3623 /* move snapshots to this dir */ 3624 for (snap = list_head(&ddpa->shared_snaps); snap; 3625 snap = list_next(&ddpa->shared_snaps, snap)) { 3626 dsl_dataset_t *ds = snap->ds; 3627 3628 /* 3629 * Property callbacks are registered to a particular 3630 * dsl_dir. Since ours is changing, evict the objset 3631 * so that they will be unregistered from the old dsl_dir. 3632 */ 3633 if (ds->ds_objset) { 3634 dmu_objset_evict(ds->ds_objset); 3635 ds->ds_objset = NULL; 3636 } 3637 3638 /* move snap name entry */ 3639 VERIFY0(dsl_dataset_get_snapname(ds)); 3640 VERIFY0(dsl_dataset_snap_remove(origin_head, 3641 ds->ds_snapname, tx, B_TRUE)); 3642 VERIFY0(zap_add(dp->dp_meta_objset, 3643 dsl_dataset_phys(hds)->ds_snapnames_zapobj, ds->ds_snapname, 3644 8, 1, &ds->ds_object, tx)); 3645 dsl_fs_ss_count_adjust(hds->ds_dir, 1, 3646 DD_FIELD_SNAPSHOT_COUNT, tx); 3647 3648 /* change containing dsl_dir */ 3649 dmu_buf_will_dirty(ds->ds_dbuf, tx); 3650 ASSERT3U(dsl_dataset_phys(ds)->ds_dir_obj, ==, odd->dd_object); 3651 dsl_dataset_phys(ds)->ds_dir_obj = dd->dd_object; 3652 ASSERT3P(ds->ds_dir, ==, odd); 3653 dsl_dir_rele(ds->ds_dir, ds); 3654 VERIFY0(dsl_dir_hold_obj(dp, dd->dd_object, 3655 NULL, ds, &ds->ds_dir)); 3656 3657 /* move any clone references */ 3658 if (dsl_dataset_phys(ds)->ds_next_clones_obj && 3659 spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 3660 zap_cursor_t zc; 3661 zap_attribute_t za; 3662 3663 for (zap_cursor_init(&zc, dp->dp_meta_objset, 3664 dsl_dataset_phys(ds)->ds_next_clones_obj); 3665 zap_cursor_retrieve(&zc, &za) == 0; 3666 zap_cursor_advance(&zc)) { 3667 dsl_dataset_t *cnds; 3668 uint64_t o; 3669 3670 if (za.za_first_integer == oldnext_obj) { 3671 /* 3672 * We've already moved the 3673 * origin's reference. 3674 */ 3675 continue; 3676 } 3677 3678 VERIFY0(dsl_dataset_hold_obj(dp, 3679 za.za_first_integer, FTAG, &cnds)); 3680 o = dsl_dir_phys(cnds->ds_dir)-> 3681 dd_head_dataset_obj; 3682 3683 VERIFY0(zap_remove_int(dp->dp_meta_objset, 3684 dsl_dir_phys(odd)->dd_clones, o, tx)); 3685 VERIFY0(zap_add_int(dp->dp_meta_objset, 3686 dsl_dir_phys(dd)->dd_clones, o, tx)); 3687 dsl_dataset_rele(cnds, FTAG); 3688 } 3689 zap_cursor_fini(&zc); 3690 } 3691 3692 ASSERT(!dsl_prop_hascb(ds)); 3693 } 3694 3695 /* 3696 * Change space accounting. 3697 * Note, pa->*usedsnap and dd_used_breakdown[SNAP] will either 3698 * both be valid, or both be 0 (resulting in delta == 0). This 3699 * is true for each of {clone,origin} independently. 3700 */ 3701 3702 delta = ddpa->cloneusedsnap - 3703 dsl_dir_phys(dd)->dd_used_breakdown[DD_USED_SNAP]; 3704 ASSERT3S(delta, >=, 0); 3705 ASSERT3U(ddpa->used, >=, delta); 3706 dsl_dir_diduse_space(dd, DD_USED_SNAP, delta, 0, 0, tx); 3707 dsl_dir_diduse_space(dd, DD_USED_HEAD, 3708 ddpa->used - delta, ddpa->comp, ddpa->uncomp, tx); 3709 3710 delta = ddpa->originusedsnap - 3711 dsl_dir_phys(odd)->dd_used_breakdown[DD_USED_SNAP]; 3712 ASSERT3S(delta, <=, 0); 3713 ASSERT3U(ddpa->used, >=, -delta); 3714 dsl_dir_diduse_space(odd, DD_USED_SNAP, delta, 0, 0, tx); 3715 dsl_dir_diduse_space(odd, DD_USED_HEAD, 3716 -ddpa->used - delta, -ddpa->comp, -ddpa->uncomp, tx); 3717 3718 dsl_dataset_phys(origin_ds)->ds_unique_bytes = ddpa->unique; 3719 3720 /* 3721 * Since livelists are specific to a clone's origin txg, they 3722 * are no longer accurate. Destroy the livelist from the clone being 3723 * promoted. If the origin dataset is a clone, destroy its livelist 3724 * as well. 3725 */ 3726 dsl_dir_remove_livelist(dd, tx, B_TRUE); 3727 dsl_dir_remove_livelist(odd, tx, B_TRUE); 3728 3729 /* log history record */ 3730 spa_history_log_internal_ds(hds, "promote", tx, " "); 3731 3732 dsl_dir_rele(odd, FTAG); 3733 promote_rele(ddpa, FTAG); 3734 3735 /* 3736 * Transfer common error blocks from old head to new head. 3737 */ 3738 if (spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_HEAD_ERRLOG)) { 3739 uint64_t old_head = origin_head->ds_object; 3740 uint64_t new_head = hds->ds_object; 3741 spa_swap_errlog(dp->dp_spa, new_head, old_head, tx); 3742 } 3743 } 3744 3745 /* 3746 * Make a list of dsl_dataset_t's for the snapshots between first_obj 3747 * (exclusive) and last_obj (inclusive). The list will be in reverse 3748 * order (last_obj will be the list_head()). If first_obj == 0, do all 3749 * snapshots back to this dataset's origin. 3750 */ 3751 static int 3752 snaplist_make(dsl_pool_t *dp, 3753 uint64_t first_obj, uint64_t last_obj, list_t *l, const void *tag) 3754 { 3755 uint64_t obj = last_obj; 3756 3757 list_create(l, sizeof (struct promotenode), 3758 offsetof(struct promotenode, link)); 3759 3760 while (obj != first_obj) { 3761 dsl_dataset_t *ds; 3762 struct promotenode *snap; 3763 int err; 3764 3765 err = dsl_dataset_hold_obj(dp, obj, tag, &ds); 3766 ASSERT(err != ENOENT); 3767 if (err != 0) 3768 return (err); 3769 3770 if (first_obj == 0) 3771 first_obj = dsl_dir_phys(ds->ds_dir)->dd_origin_obj; 3772 3773 snap = kmem_alloc(sizeof (*snap), KM_SLEEP); 3774 snap->ds = ds; 3775 list_insert_tail(l, snap); 3776 obj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 3777 } 3778 3779 return (0); 3780 } 3781 3782 static int 3783 snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep) 3784 { 3785 struct promotenode *snap; 3786 3787 *spacep = 0; 3788 for (snap = list_head(l); snap; snap = list_next(l, snap)) { 3789 uint64_t used, comp, uncomp; 3790 dsl_deadlist_space_range(&snap->ds->ds_deadlist, 3791 mintxg, UINT64_MAX, &used, &comp, &uncomp); 3792 *spacep += used; 3793 } 3794 return (0); 3795 } 3796 3797 static void 3798 snaplist_destroy(list_t *l, const void *tag) 3799 { 3800 struct promotenode *snap; 3801 3802 if (l == NULL || !list_link_active(&l->list_head)) 3803 return; 3804 3805 while ((snap = list_tail(l)) != NULL) { 3806 list_remove(l, snap); 3807 dsl_dataset_rele(snap->ds, tag); 3808 kmem_free(snap, sizeof (*snap)); 3809 } 3810 list_destroy(l); 3811 } 3812 3813 static int 3814 promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp, const void *tag) 3815 { 3816 int error; 3817 dsl_dir_t *dd; 3818 struct promotenode *snap; 3819 3820 error = dsl_dataset_hold(dp, ddpa->ddpa_clonename, tag, 3821 &ddpa->ddpa_clone); 3822 if (error != 0) 3823 return (error); 3824 dd = ddpa->ddpa_clone->ds_dir; 3825 3826 if (ddpa->ddpa_clone->ds_is_snapshot || 3827 !dsl_dir_is_clone(dd)) { 3828 dsl_dataset_rele(ddpa->ddpa_clone, tag); 3829 return (SET_ERROR(EINVAL)); 3830 } 3831 3832 error = snaplist_make(dp, 0, dsl_dir_phys(dd)->dd_origin_obj, 3833 &ddpa->shared_snaps, tag); 3834 if (error != 0) 3835 goto out; 3836 3837 error = snaplist_make(dp, 0, ddpa->ddpa_clone->ds_object, 3838 &ddpa->clone_snaps, tag); 3839 if (error != 0) 3840 goto out; 3841 3842 snap = list_head(&ddpa->shared_snaps); 3843 ASSERT3U(snap->ds->ds_object, ==, dsl_dir_phys(dd)->dd_origin_obj); 3844 error = snaplist_make(dp, dsl_dir_phys(dd)->dd_origin_obj, 3845 dsl_dir_phys(snap->ds->ds_dir)->dd_head_dataset_obj, 3846 &ddpa->origin_snaps, tag); 3847 if (error != 0) 3848 goto out; 3849 3850 if (dsl_dir_phys(snap->ds->ds_dir)->dd_origin_obj != 0) { 3851 error = dsl_dataset_hold_obj(dp, 3852 dsl_dir_phys(snap->ds->ds_dir)->dd_origin_obj, 3853 tag, &ddpa->origin_origin); 3854 if (error != 0) 3855 goto out; 3856 } 3857 out: 3858 if (error != 0) 3859 promote_rele(ddpa, tag); 3860 return (error); 3861 } 3862 3863 static void 3864 promote_rele(dsl_dataset_promote_arg_t *ddpa, const void *tag) 3865 { 3866 snaplist_destroy(&ddpa->shared_snaps, tag); 3867 snaplist_destroy(&ddpa->clone_snaps, tag); 3868 snaplist_destroy(&ddpa->origin_snaps, tag); 3869 if (ddpa->origin_origin != NULL) 3870 dsl_dataset_rele(ddpa->origin_origin, tag); 3871 dsl_dataset_rele(ddpa->ddpa_clone, tag); 3872 } 3873 3874 /* 3875 * Promote a clone. 3876 * 3877 * If it fails due to a conflicting snapshot name, "conflsnap" will be filled 3878 * in with the name. (It must be at least ZFS_MAX_DATASET_NAME_LEN bytes long.) 3879 */ 3880 int 3881 dsl_dataset_promote(const char *name, char *conflsnap) 3882 { 3883 dsl_dataset_promote_arg_t ddpa = { 0 }; 3884 uint64_t numsnaps; 3885 int error; 3886 nvpair_t *snap_pair; 3887 objset_t *os; 3888 3889 /* 3890 * We will modify space proportional to the number of 3891 * snapshots. Compute numsnaps. 3892 */ 3893 error = dmu_objset_hold(name, FTAG, &os); 3894 if (error != 0) 3895 return (error); 3896 error = zap_count(dmu_objset_pool(os)->dp_meta_objset, 3897 dsl_dataset_phys(dmu_objset_ds(os))->ds_snapnames_zapobj, 3898 &numsnaps); 3899 dmu_objset_rele(os, FTAG); 3900 if (error != 0) 3901 return (error); 3902 3903 ddpa.ddpa_clonename = name; 3904 ddpa.err_ds = fnvlist_alloc(); 3905 ddpa.cr = CRED(); 3906 ddpa.proc = curproc; 3907 3908 error = dsl_sync_task(name, dsl_dataset_promote_check, 3909 dsl_dataset_promote_sync, &ddpa, 3910 2 + numsnaps, ZFS_SPACE_CHECK_RESERVED); 3911 3912 /* 3913 * Return the first conflicting snapshot found. 3914 */ 3915 snap_pair = nvlist_next_nvpair(ddpa.err_ds, NULL); 3916 if (snap_pair != NULL && conflsnap != NULL) 3917 (void) strlcpy(conflsnap, nvpair_name(snap_pair), 3918 ZFS_MAX_DATASET_NAME_LEN); 3919 3920 fnvlist_free(ddpa.err_ds); 3921 return (error); 3922 } 3923 3924 int 3925 dsl_dataset_clone_swap_check_impl(dsl_dataset_t *clone, 3926 dsl_dataset_t *origin_head, boolean_t force, void *owner, dmu_tx_t *tx) 3927 { 3928 /* 3929 * "slack" factor for received datasets with refquota set on them. 3930 * See the bottom of this function for details on its use. 3931 */ 3932 uint64_t refquota_slack = (uint64_t)DMU_MAX_ACCESS * 3933 spa_asize_inflation; 3934 int64_t unused_refres_delta; 3935 3936 /* they should both be heads */ 3937 if (clone->ds_is_snapshot || 3938 origin_head->ds_is_snapshot) 3939 return (SET_ERROR(EINVAL)); 3940 3941 /* if we are not forcing, the branch point should be just before them */ 3942 if (!force && clone->ds_prev != origin_head->ds_prev) 3943 return (SET_ERROR(EINVAL)); 3944 3945 /* clone should be the clone (unless they are unrelated) */ 3946 if (clone->ds_prev != NULL && 3947 clone->ds_prev != clone->ds_dir->dd_pool->dp_origin_snap && 3948 origin_head->ds_dir != clone->ds_prev->ds_dir) 3949 return (SET_ERROR(EINVAL)); 3950 3951 /* the clone should be a child of the origin */ 3952 if (clone->ds_dir->dd_parent != origin_head->ds_dir) 3953 return (SET_ERROR(EINVAL)); 3954 3955 /* origin_head shouldn't be modified unless 'force' */ 3956 if (!force && 3957 dsl_dataset_modified_since_snap(origin_head, origin_head->ds_prev)) 3958 return (SET_ERROR(ETXTBSY)); 3959 3960 /* origin_head should have no long holds (e.g. is not mounted) */ 3961 if (dsl_dataset_handoff_check(origin_head, owner, tx)) 3962 return (SET_ERROR(EBUSY)); 3963 3964 /* check amount of any unconsumed refreservation */ 3965 unused_refres_delta = 3966 (int64_t)MIN(origin_head->ds_reserved, 3967 dsl_dataset_phys(origin_head)->ds_unique_bytes) - 3968 (int64_t)MIN(origin_head->ds_reserved, 3969 dsl_dataset_phys(clone)->ds_unique_bytes); 3970 3971 if (unused_refres_delta > 0 && 3972 unused_refres_delta > 3973 dsl_dir_space_available(origin_head->ds_dir, NULL, 0, TRUE)) 3974 return (SET_ERROR(ENOSPC)); 3975 3976 /* 3977 * The clone can't be too much over the head's refquota. 3978 * 3979 * To ensure that the entire refquota can be used, we allow one 3980 * transaction to exceed the refquota. Therefore, this check 3981 * needs to also allow for the space referenced to be more than the 3982 * refquota. The maximum amount of space that one transaction can use 3983 * on disk is DMU_MAX_ACCESS * spa_asize_inflation. Allowing this 3984 * overage ensures that we are able to receive a filesystem that 3985 * exceeds the refquota on the source system. 3986 * 3987 * So that overage is the refquota_slack we use below. 3988 */ 3989 if (origin_head->ds_quota != 0 && 3990 dsl_dataset_phys(clone)->ds_referenced_bytes > 3991 origin_head->ds_quota + refquota_slack) 3992 return (SET_ERROR(EDQUOT)); 3993 3994 return (0); 3995 } 3996 3997 static void 3998 dsl_dataset_swap_remap_deadlists(dsl_dataset_t *clone, 3999 dsl_dataset_t *origin, dmu_tx_t *tx) 4000 { 4001 uint64_t clone_remap_dl_obj, origin_remap_dl_obj; 4002 dsl_pool_t *dp = dmu_tx_pool(tx); 4003 4004 ASSERT(dsl_pool_sync_context(dp)); 4005 4006 clone_remap_dl_obj = dsl_dataset_get_remap_deadlist_object(clone); 4007 origin_remap_dl_obj = dsl_dataset_get_remap_deadlist_object(origin); 4008 4009 if (clone_remap_dl_obj != 0) { 4010 dsl_deadlist_close(&clone->ds_remap_deadlist); 4011 dsl_dataset_unset_remap_deadlist_object(clone, tx); 4012 } 4013 if (origin_remap_dl_obj != 0) { 4014 dsl_deadlist_close(&origin->ds_remap_deadlist); 4015 dsl_dataset_unset_remap_deadlist_object(origin, tx); 4016 } 4017 4018 if (clone_remap_dl_obj != 0) { 4019 dsl_dataset_set_remap_deadlist_object(origin, 4020 clone_remap_dl_obj, tx); 4021 dsl_deadlist_open(&origin->ds_remap_deadlist, 4022 dp->dp_meta_objset, clone_remap_dl_obj); 4023 } 4024 if (origin_remap_dl_obj != 0) { 4025 dsl_dataset_set_remap_deadlist_object(clone, 4026 origin_remap_dl_obj, tx); 4027 dsl_deadlist_open(&clone->ds_remap_deadlist, 4028 dp->dp_meta_objset, origin_remap_dl_obj); 4029 } 4030 } 4031 4032 void 4033 dsl_dataset_clone_swap_sync_impl(dsl_dataset_t *clone, 4034 dsl_dataset_t *origin_head, dmu_tx_t *tx) 4035 { 4036 dsl_pool_t *dp = dmu_tx_pool(tx); 4037 int64_t unused_refres_delta; 4038 4039 ASSERT(clone->ds_reserved == 0); 4040 /* 4041 * NOTE: On DEBUG kernels there could be a race between this and 4042 * the check function if spa_asize_inflation is adjusted... 4043 */ 4044 ASSERT(origin_head->ds_quota == 0 || 4045 dsl_dataset_phys(clone)->ds_unique_bytes <= origin_head->ds_quota + 4046 DMU_MAX_ACCESS * spa_asize_inflation); 4047 ASSERT3P(clone->ds_prev, ==, origin_head->ds_prev); 4048 4049 dsl_dir_cancel_waiters(origin_head->ds_dir); 4050 4051 /* 4052 * Swap per-dataset feature flags. 4053 */ 4054 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 4055 if (!(spa_feature_table[f].fi_flags & 4056 ZFEATURE_FLAG_PER_DATASET)) { 4057 ASSERT(!dsl_dataset_feature_is_active(clone, f)); 4058 ASSERT(!dsl_dataset_feature_is_active(origin_head, f)); 4059 continue; 4060 } 4061 4062 boolean_t clone_inuse = dsl_dataset_feature_is_active(clone, f); 4063 void *clone_feature = clone->ds_feature[f]; 4064 boolean_t origin_head_inuse = 4065 dsl_dataset_feature_is_active(origin_head, f); 4066 void *origin_head_feature = origin_head->ds_feature[f]; 4067 4068 if (clone_inuse) 4069 dsl_dataset_deactivate_feature_impl(clone, f, tx); 4070 if (origin_head_inuse) 4071 dsl_dataset_deactivate_feature_impl(origin_head, f, tx); 4072 4073 if (clone_inuse) { 4074 dsl_dataset_activate_feature(origin_head->ds_object, f, 4075 clone_feature, tx); 4076 origin_head->ds_feature[f] = clone_feature; 4077 } 4078 if (origin_head_inuse) { 4079 dsl_dataset_activate_feature(clone->ds_object, f, 4080 origin_head_feature, tx); 4081 clone->ds_feature[f] = origin_head_feature; 4082 } 4083 } 4084 4085 dmu_buf_will_dirty(clone->ds_dbuf, tx); 4086 dmu_buf_will_dirty(origin_head->ds_dbuf, tx); 4087 4088 if (clone->ds_objset != NULL) { 4089 dmu_objset_evict(clone->ds_objset); 4090 clone->ds_objset = NULL; 4091 } 4092 4093 if (origin_head->ds_objset != NULL) { 4094 dmu_objset_evict(origin_head->ds_objset); 4095 origin_head->ds_objset = NULL; 4096 } 4097 4098 unused_refres_delta = 4099 (int64_t)MIN(origin_head->ds_reserved, 4100 dsl_dataset_phys(origin_head)->ds_unique_bytes) - 4101 (int64_t)MIN(origin_head->ds_reserved, 4102 dsl_dataset_phys(clone)->ds_unique_bytes); 4103 4104 /* 4105 * Reset origin's unique bytes. 4106 */ 4107 { 4108 dsl_dataset_t *origin = clone->ds_prev; 4109 uint64_t comp, uncomp; 4110 4111 dmu_buf_will_dirty(origin->ds_dbuf, tx); 4112 dsl_deadlist_space_range(&clone->ds_deadlist, 4113 dsl_dataset_phys(origin)->ds_prev_snap_txg, UINT64_MAX, 4114 &dsl_dataset_phys(origin)->ds_unique_bytes, &comp, &uncomp); 4115 } 4116 4117 /* swap blkptrs */ 4118 { 4119 rrw_enter(&clone->ds_bp_rwlock, RW_WRITER, FTAG); 4120 rrw_enter(&origin_head->ds_bp_rwlock, RW_WRITER, FTAG); 4121 blkptr_t tmp; 4122 tmp = dsl_dataset_phys(origin_head)->ds_bp; 4123 dsl_dataset_phys(origin_head)->ds_bp = 4124 dsl_dataset_phys(clone)->ds_bp; 4125 dsl_dataset_phys(clone)->ds_bp = tmp; 4126 rrw_exit(&origin_head->ds_bp_rwlock, FTAG); 4127 rrw_exit(&clone->ds_bp_rwlock, FTAG); 4128 } 4129 4130 /* set dd_*_bytes */ 4131 { 4132 int64_t dused, dcomp, duncomp; 4133 uint64_t cdl_used, cdl_comp, cdl_uncomp; 4134 uint64_t odl_used, odl_comp, odl_uncomp; 4135 4136 ASSERT3U(dsl_dir_phys(clone->ds_dir)-> 4137 dd_used_breakdown[DD_USED_SNAP], ==, 0); 4138 4139 dsl_deadlist_space(&clone->ds_deadlist, 4140 &cdl_used, &cdl_comp, &cdl_uncomp); 4141 dsl_deadlist_space(&origin_head->ds_deadlist, 4142 &odl_used, &odl_comp, &odl_uncomp); 4143 4144 dused = dsl_dataset_phys(clone)->ds_referenced_bytes + 4145 cdl_used - 4146 (dsl_dataset_phys(origin_head)->ds_referenced_bytes + 4147 odl_used); 4148 dcomp = dsl_dataset_phys(clone)->ds_compressed_bytes + 4149 cdl_comp - 4150 (dsl_dataset_phys(origin_head)->ds_compressed_bytes + 4151 odl_comp); 4152 duncomp = dsl_dataset_phys(clone)->ds_uncompressed_bytes + 4153 cdl_uncomp - 4154 (dsl_dataset_phys(origin_head)->ds_uncompressed_bytes + 4155 odl_uncomp); 4156 4157 dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_HEAD, 4158 dused, dcomp, duncomp, tx); 4159 dsl_dir_diduse_space(clone->ds_dir, DD_USED_HEAD, 4160 -dused, -dcomp, -duncomp, tx); 4161 4162 /* 4163 * The difference in the space used by snapshots is the 4164 * difference in snapshot space due to the head's 4165 * deadlist (since that's the only thing that's 4166 * changing that affects the snapused). 4167 */ 4168 dsl_deadlist_space_range(&clone->ds_deadlist, 4169 origin_head->ds_dir->dd_origin_txg, UINT64_MAX, 4170 &cdl_used, &cdl_comp, &cdl_uncomp); 4171 dsl_deadlist_space_range(&origin_head->ds_deadlist, 4172 origin_head->ds_dir->dd_origin_txg, UINT64_MAX, 4173 &odl_used, &odl_comp, &odl_uncomp); 4174 dsl_dir_transfer_space(origin_head->ds_dir, cdl_used - odl_used, 4175 DD_USED_HEAD, DD_USED_SNAP, tx); 4176 } 4177 4178 /* swap ds_*_bytes */ 4179 SWITCH64(dsl_dataset_phys(origin_head)->ds_referenced_bytes, 4180 dsl_dataset_phys(clone)->ds_referenced_bytes); 4181 SWITCH64(dsl_dataset_phys(origin_head)->ds_compressed_bytes, 4182 dsl_dataset_phys(clone)->ds_compressed_bytes); 4183 SWITCH64(dsl_dataset_phys(origin_head)->ds_uncompressed_bytes, 4184 dsl_dataset_phys(clone)->ds_uncompressed_bytes); 4185 SWITCH64(dsl_dataset_phys(origin_head)->ds_unique_bytes, 4186 dsl_dataset_phys(clone)->ds_unique_bytes); 4187 4188 /* apply any parent delta for change in unconsumed refreservation */ 4189 dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_REFRSRV, 4190 unused_refres_delta, 0, 0, tx); 4191 4192 /* 4193 * Swap deadlists. 4194 */ 4195 dsl_deadlist_close(&clone->ds_deadlist); 4196 dsl_deadlist_close(&origin_head->ds_deadlist); 4197 SWITCH64(dsl_dataset_phys(origin_head)->ds_deadlist_obj, 4198 dsl_dataset_phys(clone)->ds_deadlist_obj); 4199 dsl_deadlist_open(&clone->ds_deadlist, dp->dp_meta_objset, 4200 dsl_dataset_phys(clone)->ds_deadlist_obj); 4201 dsl_deadlist_open(&origin_head->ds_deadlist, dp->dp_meta_objset, 4202 dsl_dataset_phys(origin_head)->ds_deadlist_obj); 4203 dsl_dataset_swap_remap_deadlists(clone, origin_head, tx); 4204 4205 /* 4206 * If there is a bookmark at the origin, its "next dataset" is 4207 * changing, so we need to reset its FBN. 4208 */ 4209 dsl_bookmark_next_changed(origin_head, origin_head->ds_prev, tx); 4210 4211 dsl_scan_ds_clone_swapped(origin_head, clone, tx); 4212 4213 /* 4214 * Destroy any livelists associated with the clone or the origin, 4215 * since after the swap the corresponding livelists are no longer 4216 * valid. 4217 */ 4218 dsl_dir_remove_livelist(clone->ds_dir, tx, B_TRUE); 4219 dsl_dir_remove_livelist(origin_head->ds_dir, tx, B_TRUE); 4220 4221 spa_history_log_internal_ds(clone, "clone swap", tx, 4222 "parent=%s", origin_head->ds_dir->dd_myname); 4223 } 4224 4225 /* 4226 * Given a pool name and a dataset object number in that pool, 4227 * return the name of that dataset. 4228 */ 4229 int 4230 dsl_dsobj_to_dsname(char *pname, uint64_t obj, char *buf) 4231 { 4232 dsl_pool_t *dp; 4233 dsl_dataset_t *ds; 4234 int error; 4235 4236 error = dsl_pool_hold(pname, FTAG, &dp); 4237 if (error != 0) 4238 return (error); 4239 4240 error = dsl_dataset_hold_obj(dp, obj, FTAG, &ds); 4241 if (error == 0) { 4242 dsl_dataset_name(ds, buf); 4243 dsl_dataset_rele(ds, FTAG); 4244 } 4245 dsl_pool_rele(dp, FTAG); 4246 4247 return (error); 4248 } 4249 4250 int 4251 dsl_dataset_check_quota(dsl_dataset_t *ds, boolean_t check_quota, 4252 uint64_t asize, uint64_t inflight, uint64_t *used, uint64_t *ref_rsrv) 4253 { 4254 int error = 0; 4255 4256 ASSERT3S(asize, >, 0); 4257 4258 /* 4259 * *ref_rsrv is the portion of asize that will come from any 4260 * unconsumed refreservation space. 4261 */ 4262 *ref_rsrv = 0; 4263 4264 mutex_enter(&ds->ds_lock); 4265 /* 4266 * Make a space adjustment for reserved bytes. 4267 */ 4268 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes) { 4269 ASSERT3U(*used, >=, 4270 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes); 4271 *used -= 4272 (ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes); 4273 *ref_rsrv = 4274 asize - MIN(asize, parent_delta(ds, asize + inflight)); 4275 } 4276 4277 if (!check_quota || ds->ds_quota == 0) { 4278 mutex_exit(&ds->ds_lock); 4279 return (0); 4280 } 4281 /* 4282 * If they are requesting more space, and our current estimate 4283 * is over quota, they get to try again unless the actual 4284 * on-disk is over quota and there are no pending changes (which 4285 * may free up space for us). 4286 */ 4287 if (dsl_dataset_phys(ds)->ds_referenced_bytes + inflight >= 4288 ds->ds_quota) { 4289 if (inflight > 0 || 4290 dsl_dataset_phys(ds)->ds_referenced_bytes < ds->ds_quota) 4291 error = SET_ERROR(ERESTART); 4292 else 4293 error = SET_ERROR(EDQUOT); 4294 } 4295 mutex_exit(&ds->ds_lock); 4296 4297 return (error); 4298 } 4299 4300 typedef struct dsl_dataset_set_qr_arg { 4301 const char *ddsqra_name; 4302 zprop_source_t ddsqra_source; 4303 uint64_t ddsqra_value; 4304 } dsl_dataset_set_qr_arg_t; 4305 4306 4307 static int 4308 dsl_dataset_set_refquota_check(void *arg, dmu_tx_t *tx) 4309 { 4310 dsl_dataset_set_qr_arg_t *ddsqra = arg; 4311 dsl_pool_t *dp = dmu_tx_pool(tx); 4312 dsl_dataset_t *ds; 4313 int error; 4314 uint64_t newval; 4315 4316 if (spa_version(dp->dp_spa) < SPA_VERSION_REFQUOTA) 4317 return (SET_ERROR(ENOTSUP)); 4318 4319 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds); 4320 if (error != 0) 4321 return (error); 4322 4323 if (ds->ds_is_snapshot) { 4324 dsl_dataset_rele(ds, FTAG); 4325 return (SET_ERROR(EINVAL)); 4326 } 4327 4328 error = dsl_prop_predict(ds->ds_dir, 4329 zfs_prop_to_name(ZFS_PROP_REFQUOTA), 4330 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval); 4331 if (error != 0) { 4332 dsl_dataset_rele(ds, FTAG); 4333 return (error); 4334 } 4335 4336 if (newval == 0) { 4337 dsl_dataset_rele(ds, FTAG); 4338 return (0); 4339 } 4340 4341 if (newval < dsl_dataset_phys(ds)->ds_referenced_bytes || 4342 newval < ds->ds_reserved) { 4343 dsl_dataset_rele(ds, FTAG); 4344 return (SET_ERROR(ENOSPC)); 4345 } 4346 4347 dsl_dataset_rele(ds, FTAG); 4348 return (0); 4349 } 4350 4351 static void 4352 dsl_dataset_set_refquota_sync(void *arg, dmu_tx_t *tx) 4353 { 4354 dsl_dataset_set_qr_arg_t *ddsqra = arg; 4355 dsl_pool_t *dp = dmu_tx_pool(tx); 4356 dsl_dataset_t *ds = NULL; 4357 uint64_t newval; 4358 4359 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds)); 4360 4361 dsl_prop_set_sync_impl(ds, 4362 zfs_prop_to_name(ZFS_PROP_REFQUOTA), 4363 ddsqra->ddsqra_source, sizeof (ddsqra->ddsqra_value), 1, 4364 &ddsqra->ddsqra_value, tx); 4365 4366 VERIFY0(dsl_prop_get_int_ds(ds, 4367 zfs_prop_to_name(ZFS_PROP_REFQUOTA), &newval)); 4368 4369 if (ds->ds_quota != newval) { 4370 dmu_buf_will_dirty(ds->ds_dbuf, tx); 4371 ds->ds_quota = newval; 4372 } 4373 dsl_dataset_rele(ds, FTAG); 4374 } 4375 4376 int 4377 dsl_dataset_set_refquota(const char *dsname, zprop_source_t source, 4378 uint64_t refquota) 4379 { 4380 dsl_dataset_set_qr_arg_t ddsqra; 4381 4382 ddsqra.ddsqra_name = dsname; 4383 ddsqra.ddsqra_source = source; 4384 ddsqra.ddsqra_value = refquota; 4385 4386 return (dsl_sync_task(dsname, dsl_dataset_set_refquota_check, 4387 dsl_dataset_set_refquota_sync, &ddsqra, 0, 4388 ZFS_SPACE_CHECK_EXTRA_RESERVED)); 4389 } 4390 4391 static int 4392 dsl_dataset_set_refreservation_check(void *arg, dmu_tx_t *tx) 4393 { 4394 dsl_dataset_set_qr_arg_t *ddsqra = arg; 4395 dsl_pool_t *dp = dmu_tx_pool(tx); 4396 dsl_dataset_t *ds; 4397 int error; 4398 uint64_t newval, unique; 4399 4400 if (spa_version(dp->dp_spa) < SPA_VERSION_REFRESERVATION) 4401 return (SET_ERROR(ENOTSUP)); 4402 4403 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds); 4404 if (error != 0) 4405 return (error); 4406 4407 if (ds->ds_is_snapshot) { 4408 dsl_dataset_rele(ds, FTAG); 4409 return (SET_ERROR(EINVAL)); 4410 } 4411 4412 error = dsl_prop_predict(ds->ds_dir, 4413 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 4414 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval); 4415 if (error != 0) { 4416 dsl_dataset_rele(ds, FTAG); 4417 return (error); 4418 } 4419 4420 /* 4421 * If we are doing the preliminary check in open context, the 4422 * space estimates may be inaccurate. 4423 */ 4424 if (!dmu_tx_is_syncing(tx)) { 4425 dsl_dataset_rele(ds, FTAG); 4426 return (0); 4427 } 4428 4429 mutex_enter(&ds->ds_lock); 4430 if (!DS_UNIQUE_IS_ACCURATE(ds)) 4431 dsl_dataset_recalc_head_uniq(ds); 4432 unique = dsl_dataset_phys(ds)->ds_unique_bytes; 4433 mutex_exit(&ds->ds_lock); 4434 4435 if (MAX(unique, newval) > MAX(unique, ds->ds_reserved)) { 4436 uint64_t delta = MAX(unique, newval) - 4437 MAX(unique, ds->ds_reserved); 4438 4439 if (delta > 4440 dsl_dir_space_available(ds->ds_dir, NULL, 0, B_TRUE) || 4441 (ds->ds_quota > 0 && newval > ds->ds_quota)) { 4442 dsl_dataset_rele(ds, FTAG); 4443 return (SET_ERROR(ENOSPC)); 4444 } 4445 } 4446 4447 dsl_dataset_rele(ds, FTAG); 4448 return (0); 4449 } 4450 4451 void 4452 dsl_dataset_set_refreservation_sync_impl(dsl_dataset_t *ds, 4453 zprop_source_t source, uint64_t value, dmu_tx_t *tx) 4454 { 4455 uint64_t newval; 4456 uint64_t unique; 4457 int64_t delta; 4458 4459 dsl_prop_set_sync_impl(ds, zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 4460 source, sizeof (value), 1, &value, tx); 4461 4462 VERIFY0(dsl_prop_get_int_ds(ds, 4463 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), &newval)); 4464 4465 dmu_buf_will_dirty(ds->ds_dbuf, tx); 4466 mutex_enter(&ds->ds_dir->dd_lock); 4467 mutex_enter(&ds->ds_lock); 4468 ASSERT(DS_UNIQUE_IS_ACCURATE(ds)); 4469 unique = dsl_dataset_phys(ds)->ds_unique_bytes; 4470 delta = MAX(0, (int64_t)(newval - unique)) - 4471 MAX(0, (int64_t)(ds->ds_reserved - unique)); 4472 ds->ds_reserved = newval; 4473 mutex_exit(&ds->ds_lock); 4474 4475 dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV, delta, 0, 0, tx); 4476 mutex_exit(&ds->ds_dir->dd_lock); 4477 } 4478 4479 static void 4480 dsl_dataset_set_refreservation_sync(void *arg, dmu_tx_t *tx) 4481 { 4482 dsl_dataset_set_qr_arg_t *ddsqra = arg; 4483 dsl_pool_t *dp = dmu_tx_pool(tx); 4484 dsl_dataset_t *ds = NULL; 4485 4486 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds)); 4487 dsl_dataset_set_refreservation_sync_impl(ds, 4488 ddsqra->ddsqra_source, ddsqra->ddsqra_value, tx); 4489 dsl_dataset_rele(ds, FTAG); 4490 } 4491 4492 int 4493 dsl_dataset_set_refreservation(const char *dsname, zprop_source_t source, 4494 uint64_t refreservation) 4495 { 4496 dsl_dataset_set_qr_arg_t ddsqra; 4497 4498 ddsqra.ddsqra_name = dsname; 4499 ddsqra.ddsqra_source = source; 4500 ddsqra.ddsqra_value = refreservation; 4501 4502 return (dsl_sync_task(dsname, dsl_dataset_set_refreservation_check, 4503 dsl_dataset_set_refreservation_sync, &ddsqra, 0, 4504 ZFS_SPACE_CHECK_EXTRA_RESERVED)); 4505 } 4506 4507 typedef struct dsl_dataset_set_compression_arg { 4508 const char *ddsca_name; 4509 zprop_source_t ddsca_source; 4510 uint64_t ddsca_value; 4511 } dsl_dataset_set_compression_arg_t; 4512 4513 static int 4514 dsl_dataset_set_compression_check(void *arg, dmu_tx_t *tx) 4515 { 4516 dsl_dataset_set_compression_arg_t *ddsca = arg; 4517 dsl_pool_t *dp = dmu_tx_pool(tx); 4518 4519 uint64_t compval = ZIO_COMPRESS_ALGO(ddsca->ddsca_value); 4520 spa_feature_t f = zio_compress_to_feature(compval); 4521 4522 if (f == SPA_FEATURE_NONE) 4523 return (SET_ERROR(EINVAL)); 4524 4525 if (!spa_feature_is_enabled(dp->dp_spa, f)) 4526 return (SET_ERROR(ENOTSUP)); 4527 4528 return (0); 4529 } 4530 4531 static void 4532 dsl_dataset_set_compression_sync(void *arg, dmu_tx_t *tx) 4533 { 4534 dsl_dataset_set_compression_arg_t *ddsca = arg; 4535 dsl_pool_t *dp = dmu_tx_pool(tx); 4536 dsl_dataset_t *ds = NULL; 4537 4538 uint64_t compval = ZIO_COMPRESS_ALGO(ddsca->ddsca_value); 4539 spa_feature_t f = zio_compress_to_feature(compval); 4540 ASSERT3S(f, !=, SPA_FEATURE_NONE); 4541 ASSERT3S(spa_feature_table[f].fi_type, ==, ZFEATURE_TYPE_BOOLEAN); 4542 4543 VERIFY0(dsl_dataset_hold(dp, ddsca->ddsca_name, FTAG, &ds)); 4544 if (zfeature_active(f, ds->ds_feature[f]) != B_TRUE) { 4545 ds->ds_feature_activation[f] = (void *)B_TRUE; 4546 dsl_dataset_activate_feature(ds->ds_object, f, 4547 ds->ds_feature_activation[f], tx); 4548 ds->ds_feature[f] = ds->ds_feature_activation[f]; 4549 } 4550 dsl_dataset_rele(ds, FTAG); 4551 } 4552 4553 int 4554 dsl_dataset_set_compression(const char *dsname, zprop_source_t source, 4555 uint64_t compression) 4556 { 4557 dsl_dataset_set_compression_arg_t ddsca; 4558 4559 /* 4560 * The sync task is only required for zstd in order to activate 4561 * the feature flag when the property is first set. 4562 */ 4563 if (ZIO_COMPRESS_ALGO(compression) != ZIO_COMPRESS_ZSTD) 4564 return (0); 4565 4566 ddsca.ddsca_name = dsname; 4567 ddsca.ddsca_source = source; 4568 ddsca.ddsca_value = compression; 4569 4570 return (dsl_sync_task(dsname, dsl_dataset_set_compression_check, 4571 dsl_dataset_set_compression_sync, &ddsca, 0, 4572 ZFS_SPACE_CHECK_EXTRA_RESERVED)); 4573 } 4574 4575 /* 4576 * Return (in *usedp) the amount of space referenced by "new" that was not 4577 * referenced at the time the bookmark corresponds to. "New" may be a 4578 * snapshot or a head. The bookmark must be before new, in 4579 * new's filesystem (or its origin) -- caller verifies this. 4580 * 4581 * The written space is calculated by considering two components: First, we 4582 * ignore any freed space, and calculate the written as new's used space 4583 * minus old's used space. Next, we add in the amount of space that was freed 4584 * between the two time points, thus reducing new's used space relative to 4585 * old's. Specifically, this is the space that was born before 4586 * zbm_creation_txg, and freed before new (ie. on new's deadlist or a 4587 * previous deadlist). 4588 * 4589 * space freed [---------------------] 4590 * snapshots ---O-------O--------O-------O------ 4591 * bookmark new 4592 * 4593 * Note, the bookmark's zbm_*_bytes_refd must be valid, but if the HAS_FBN 4594 * flag is not set, we will calculate the freed_before_next based on the 4595 * next snapshot's deadlist, rather than using zbm_*_freed_before_next_snap. 4596 */ 4597 static int 4598 dsl_dataset_space_written_impl(zfs_bookmark_phys_t *bmp, 4599 dsl_dataset_t *new, uint64_t *usedp, uint64_t *compp, uint64_t *uncompp) 4600 { 4601 int err = 0; 4602 dsl_pool_t *dp = new->ds_dir->dd_pool; 4603 4604 ASSERT(dsl_pool_config_held(dp)); 4605 if (dsl_dataset_is_snapshot(new)) { 4606 ASSERT3U(bmp->zbm_creation_txg, <, 4607 dsl_dataset_phys(new)->ds_creation_txg); 4608 } 4609 4610 *usedp = 0; 4611 *usedp += dsl_dataset_phys(new)->ds_referenced_bytes; 4612 *usedp -= bmp->zbm_referenced_bytes_refd; 4613 4614 *compp = 0; 4615 *compp += dsl_dataset_phys(new)->ds_compressed_bytes; 4616 *compp -= bmp->zbm_compressed_bytes_refd; 4617 4618 *uncompp = 0; 4619 *uncompp += dsl_dataset_phys(new)->ds_uncompressed_bytes; 4620 *uncompp -= bmp->zbm_uncompressed_bytes_refd; 4621 4622 dsl_dataset_t *snap = new; 4623 4624 while (dsl_dataset_phys(snap)->ds_prev_snap_txg > 4625 bmp->zbm_creation_txg) { 4626 uint64_t used, comp, uncomp; 4627 4628 dsl_deadlist_space_range(&snap->ds_deadlist, 4629 0, bmp->zbm_creation_txg, 4630 &used, &comp, &uncomp); 4631 *usedp += used; 4632 *compp += comp; 4633 *uncompp += uncomp; 4634 4635 uint64_t snapobj = dsl_dataset_phys(snap)->ds_prev_snap_obj; 4636 if (snap != new) 4637 dsl_dataset_rele(snap, FTAG); 4638 err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &snap); 4639 if (err != 0) 4640 break; 4641 } 4642 4643 /* 4644 * We might not have the FBN if we are calculating written from 4645 * a snapshot (because we didn't know the correct "next" snapshot 4646 * until now). 4647 */ 4648 if (bmp->zbm_flags & ZBM_FLAG_HAS_FBN) { 4649 *usedp += bmp->zbm_referenced_freed_before_next_snap; 4650 *compp += bmp->zbm_compressed_freed_before_next_snap; 4651 *uncompp += bmp->zbm_uncompressed_freed_before_next_snap; 4652 } else { 4653 ASSERT3U(dsl_dataset_phys(snap)->ds_prev_snap_txg, ==, 4654 bmp->zbm_creation_txg); 4655 uint64_t used, comp, uncomp; 4656 dsl_deadlist_space(&snap->ds_deadlist, &used, &comp, &uncomp); 4657 *usedp += used; 4658 *compp += comp; 4659 *uncompp += uncomp; 4660 } 4661 if (snap != new) 4662 dsl_dataset_rele(snap, FTAG); 4663 return (err); 4664 } 4665 4666 /* 4667 * Return (in *usedp) the amount of space written in new that was not 4668 * present at the time the bookmark corresponds to. New may be a 4669 * snapshot or the head. Old must be a bookmark before new, in 4670 * new's filesystem (or its origin) -- caller verifies this. 4671 */ 4672 int 4673 dsl_dataset_space_written_bookmark(zfs_bookmark_phys_t *bmp, 4674 dsl_dataset_t *new, uint64_t *usedp, uint64_t *compp, uint64_t *uncompp) 4675 { 4676 if (!(bmp->zbm_flags & ZBM_FLAG_HAS_FBN)) 4677 return (SET_ERROR(ENOTSUP)); 4678 return (dsl_dataset_space_written_impl(bmp, new, 4679 usedp, compp, uncompp)); 4680 } 4681 4682 /* 4683 * Return (in *usedp) the amount of space written in new that is not 4684 * present in oldsnap. New may be a snapshot or the head. Old must be 4685 * a snapshot before new, in new's filesystem (or its origin). If not then 4686 * fail and return EINVAL. 4687 */ 4688 int 4689 dsl_dataset_space_written(dsl_dataset_t *oldsnap, dsl_dataset_t *new, 4690 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp) 4691 { 4692 if (!dsl_dataset_is_before(new, oldsnap, 0)) 4693 return (SET_ERROR(EINVAL)); 4694 4695 zfs_bookmark_phys_t zbm = { 0 }; 4696 dsl_dataset_phys_t *dsp = dsl_dataset_phys(oldsnap); 4697 zbm.zbm_guid = dsp->ds_guid; 4698 zbm.zbm_creation_txg = dsp->ds_creation_txg; 4699 zbm.zbm_creation_time = dsp->ds_creation_time; 4700 zbm.zbm_referenced_bytes_refd = dsp->ds_referenced_bytes; 4701 zbm.zbm_compressed_bytes_refd = dsp->ds_compressed_bytes; 4702 zbm.zbm_uncompressed_bytes_refd = dsp->ds_uncompressed_bytes; 4703 4704 /* 4705 * If oldsnap is the origin (or origin's origin, ...) of new, 4706 * we can't easily calculate the effective FBN. Therefore, 4707 * we do not set ZBM_FLAG_HAS_FBN, so that the _impl will calculate 4708 * it relative to the correct "next": the next snapshot towards "new", 4709 * rather than the next snapshot in oldsnap's dsl_dir. 4710 */ 4711 return (dsl_dataset_space_written_impl(&zbm, new, 4712 usedp, compp, uncompp)); 4713 } 4714 4715 /* 4716 * Return (in *usedp) the amount of space that will be reclaimed if firstsnap, 4717 * lastsnap, and all snapshots in between are deleted. 4718 * 4719 * blocks that would be freed [---------------------------] 4720 * snapshots ---O-------O--------O-------O--------O 4721 * firstsnap lastsnap 4722 * 4723 * This is the set of blocks that were born after the snap before firstsnap, 4724 * (birth > firstsnap->prev_snap_txg) and died before the snap after the 4725 * last snap (ie, is on lastsnap->ds_next->ds_deadlist or an earlier deadlist). 4726 * We calculate this by iterating over the relevant deadlists (from the snap 4727 * after lastsnap, backward to the snap after firstsnap), summing up the 4728 * space on the deadlist that was born after the snap before firstsnap. 4729 */ 4730 int 4731 dsl_dataset_space_wouldfree(dsl_dataset_t *firstsnap, 4732 dsl_dataset_t *lastsnap, 4733 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp) 4734 { 4735 int err = 0; 4736 uint64_t snapobj; 4737 dsl_pool_t *dp = firstsnap->ds_dir->dd_pool; 4738 4739 ASSERT(firstsnap->ds_is_snapshot); 4740 ASSERT(lastsnap->ds_is_snapshot); 4741 4742 /* 4743 * Check that the snapshots are in the same dsl_dir, and firstsnap 4744 * is before lastsnap. 4745 */ 4746 if (firstsnap->ds_dir != lastsnap->ds_dir || 4747 dsl_dataset_phys(firstsnap)->ds_creation_txg > 4748 dsl_dataset_phys(lastsnap)->ds_creation_txg) 4749 return (SET_ERROR(EINVAL)); 4750 4751 *usedp = *compp = *uncompp = 0; 4752 4753 snapobj = dsl_dataset_phys(lastsnap)->ds_next_snap_obj; 4754 while (snapobj != firstsnap->ds_object) { 4755 dsl_dataset_t *ds; 4756 uint64_t used, comp, uncomp; 4757 4758 err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &ds); 4759 if (err != 0) 4760 break; 4761 4762 dsl_deadlist_space_range(&ds->ds_deadlist, 4763 dsl_dataset_phys(firstsnap)->ds_prev_snap_txg, UINT64_MAX, 4764 &used, &comp, &uncomp); 4765 *usedp += used; 4766 *compp += comp; 4767 *uncompp += uncomp; 4768 4769 snapobj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 4770 ASSERT3U(snapobj, !=, 0); 4771 dsl_dataset_rele(ds, FTAG); 4772 } 4773 return (err); 4774 } 4775 4776 /* 4777 * Return TRUE if 'earlier' is an earlier snapshot in 'later's timeline. 4778 * For example, they could both be snapshots of the same filesystem, and 4779 * 'earlier' is before 'later'. Or 'earlier' could be the origin of 4780 * 'later's filesystem. Or 'earlier' could be an older snapshot in the origin's 4781 * filesystem. Or 'earlier' could be the origin's origin. 4782 * 4783 * If non-zero, earlier_txg is used instead of earlier's ds_creation_txg. 4784 */ 4785 boolean_t 4786 dsl_dataset_is_before(dsl_dataset_t *later, dsl_dataset_t *earlier, 4787 uint64_t earlier_txg) 4788 { 4789 dsl_pool_t *dp = later->ds_dir->dd_pool; 4790 int error; 4791 boolean_t ret; 4792 4793 ASSERT(dsl_pool_config_held(dp)); 4794 ASSERT(earlier->ds_is_snapshot || earlier_txg != 0); 4795 4796 if (earlier_txg == 0) 4797 earlier_txg = dsl_dataset_phys(earlier)->ds_creation_txg; 4798 4799 if (later->ds_is_snapshot && 4800 earlier_txg >= dsl_dataset_phys(later)->ds_creation_txg) 4801 return (B_FALSE); 4802 4803 if (later->ds_dir == earlier->ds_dir) 4804 return (B_TRUE); 4805 4806 /* 4807 * We check dd_origin_obj explicitly here rather than using 4808 * dsl_dir_is_clone() so that we will return TRUE if "earlier" 4809 * is $ORIGIN@$ORIGIN. dsl_dataset_space_written() depends on 4810 * this behavior. 4811 */ 4812 if (dsl_dir_phys(later->ds_dir)->dd_origin_obj == 0) 4813 return (B_FALSE); 4814 4815 dsl_dataset_t *origin; 4816 error = dsl_dataset_hold_obj(dp, 4817 dsl_dir_phys(later->ds_dir)->dd_origin_obj, FTAG, &origin); 4818 if (error != 0) 4819 return (B_FALSE); 4820 if (dsl_dataset_phys(origin)->ds_creation_txg == earlier_txg && 4821 origin->ds_dir == earlier->ds_dir) { 4822 dsl_dataset_rele(origin, FTAG); 4823 return (B_TRUE); 4824 } 4825 ret = dsl_dataset_is_before(origin, earlier, earlier_txg); 4826 dsl_dataset_rele(origin, FTAG); 4827 return (ret); 4828 } 4829 4830 void 4831 dsl_dataset_zapify(dsl_dataset_t *ds, dmu_tx_t *tx) 4832 { 4833 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 4834 dmu_object_zapify(mos, ds->ds_object, DMU_OT_DSL_DATASET, tx); 4835 } 4836 4837 boolean_t 4838 dsl_dataset_is_zapified(dsl_dataset_t *ds) 4839 { 4840 dmu_object_info_t doi; 4841 4842 dmu_object_info_from_db(ds->ds_dbuf, &doi); 4843 return (doi.doi_type == DMU_OTN_ZAP_METADATA); 4844 } 4845 4846 boolean_t 4847 dsl_dataset_has_resume_receive_state(dsl_dataset_t *ds) 4848 { 4849 return (dsl_dataset_is_zapified(ds) && 4850 zap_contains(ds->ds_dir->dd_pool->dp_meta_objset, 4851 ds->ds_object, DS_FIELD_RESUME_TOGUID) == 0); 4852 } 4853 4854 uint64_t 4855 dsl_dataset_get_remap_deadlist_object(dsl_dataset_t *ds) 4856 { 4857 uint64_t remap_deadlist_obj; 4858 int err; 4859 4860 if (!dsl_dataset_is_zapified(ds)) 4861 return (0); 4862 4863 err = zap_lookup(ds->ds_dir->dd_pool->dp_meta_objset, ds->ds_object, 4864 DS_FIELD_REMAP_DEADLIST, sizeof (remap_deadlist_obj), 1, 4865 &remap_deadlist_obj); 4866 4867 if (err != 0) { 4868 VERIFY3S(err, ==, ENOENT); 4869 return (0); 4870 } 4871 4872 ASSERT(remap_deadlist_obj != 0); 4873 return (remap_deadlist_obj); 4874 } 4875 4876 boolean_t 4877 dsl_dataset_remap_deadlist_exists(dsl_dataset_t *ds) 4878 { 4879 EQUIV(dsl_deadlist_is_open(&ds->ds_remap_deadlist), 4880 dsl_dataset_get_remap_deadlist_object(ds) != 0); 4881 return (dsl_deadlist_is_open(&ds->ds_remap_deadlist)); 4882 } 4883 4884 static void 4885 dsl_dataset_set_remap_deadlist_object(dsl_dataset_t *ds, uint64_t obj, 4886 dmu_tx_t *tx) 4887 { 4888 ASSERT(obj != 0); 4889 dsl_dataset_zapify(ds, tx); 4890 VERIFY0(zap_add(ds->ds_dir->dd_pool->dp_meta_objset, ds->ds_object, 4891 DS_FIELD_REMAP_DEADLIST, sizeof (obj), 1, &obj, tx)); 4892 } 4893 4894 static void 4895 dsl_dataset_unset_remap_deadlist_object(dsl_dataset_t *ds, dmu_tx_t *tx) 4896 { 4897 VERIFY0(zap_remove(ds->ds_dir->dd_pool->dp_meta_objset, 4898 ds->ds_object, DS_FIELD_REMAP_DEADLIST, tx)); 4899 } 4900 4901 void 4902 dsl_dataset_destroy_remap_deadlist(dsl_dataset_t *ds, dmu_tx_t *tx) 4903 { 4904 uint64_t remap_deadlist_object; 4905 spa_t *spa = ds->ds_dir->dd_pool->dp_spa; 4906 4907 ASSERT(dmu_tx_is_syncing(tx)); 4908 ASSERT(dsl_dataset_remap_deadlist_exists(ds)); 4909 4910 remap_deadlist_object = ds->ds_remap_deadlist.dl_object; 4911 dsl_deadlist_close(&ds->ds_remap_deadlist); 4912 dsl_deadlist_free(spa_meta_objset(spa), remap_deadlist_object, tx); 4913 dsl_dataset_unset_remap_deadlist_object(ds, tx); 4914 spa_feature_decr(spa, SPA_FEATURE_OBSOLETE_COUNTS, tx); 4915 } 4916 4917 void 4918 dsl_dataset_create_remap_deadlist(dsl_dataset_t *ds, dmu_tx_t *tx) 4919 { 4920 uint64_t remap_deadlist_obj; 4921 spa_t *spa = ds->ds_dir->dd_pool->dp_spa; 4922 4923 ASSERT(dmu_tx_is_syncing(tx)); 4924 ASSERT(MUTEX_HELD(&ds->ds_remap_deadlist_lock)); 4925 /* 4926 * Currently we only create remap deadlists when there are indirect 4927 * vdevs with referenced mappings. 4928 */ 4929 ASSERT(spa_feature_is_active(spa, SPA_FEATURE_DEVICE_REMOVAL)); 4930 4931 remap_deadlist_obj = dsl_deadlist_clone( 4932 &ds->ds_deadlist, UINT64_MAX, 4933 dsl_dataset_phys(ds)->ds_prev_snap_obj, tx); 4934 dsl_dataset_set_remap_deadlist_object(ds, 4935 remap_deadlist_obj, tx); 4936 dsl_deadlist_open(&ds->ds_remap_deadlist, spa_meta_objset(spa), 4937 remap_deadlist_obj); 4938 spa_feature_incr(spa, SPA_FEATURE_OBSOLETE_COUNTS, tx); 4939 } 4940 4941 void 4942 dsl_dataset_activate_redaction(dsl_dataset_t *ds, uint64_t *redact_snaps, 4943 uint64_t num_redact_snaps, dmu_tx_t *tx) 4944 { 4945 uint64_t dsobj = ds->ds_object; 4946 struct feature_type_uint64_array_arg *ftuaa = 4947 kmem_zalloc(sizeof (*ftuaa), KM_SLEEP); 4948 ftuaa->length = (int64_t)num_redact_snaps; 4949 if (num_redact_snaps > 0) { 4950 ftuaa->array = kmem_alloc(num_redact_snaps * sizeof (uint64_t), 4951 KM_SLEEP); 4952 memcpy(ftuaa->array, redact_snaps, num_redact_snaps * 4953 sizeof (uint64_t)); 4954 } 4955 dsl_dataset_activate_feature(dsobj, SPA_FEATURE_REDACTED_DATASETS, 4956 ftuaa, tx); 4957 ds->ds_feature[SPA_FEATURE_REDACTED_DATASETS] = ftuaa; 4958 } 4959 4960 /* 4961 * Find and return (in *oldest_dsobj) the oldest snapshot of the dsobj 4962 * dataset whose birth time is >= min_txg. 4963 */ 4964 int 4965 dsl_dataset_oldest_snapshot(spa_t *spa, uint64_t head_ds, uint64_t min_txg, 4966 uint64_t *oldest_dsobj) 4967 { 4968 dsl_dataset_t *ds; 4969 dsl_pool_t *dp = spa->spa_dsl_pool; 4970 4971 int error = dsl_dataset_hold_obj(dp, head_ds, FTAG, &ds); 4972 if (error != 0) 4973 return (error); 4974 4975 uint64_t prev_obj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 4976 uint64_t prev_obj_txg = dsl_dataset_phys(ds)->ds_prev_snap_txg; 4977 4978 while (prev_obj != 0 && min_txg < prev_obj_txg) { 4979 dsl_dataset_rele(ds, FTAG); 4980 if ((error = dsl_dataset_hold_obj(dp, prev_obj, 4981 FTAG, &ds)) != 0) 4982 return (error); 4983 prev_obj_txg = dsl_dataset_phys(ds)->ds_prev_snap_txg; 4984 prev_obj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 4985 } 4986 *oldest_dsobj = ds->ds_object; 4987 dsl_dataset_rele(ds, FTAG); 4988 return (0); 4989 } 4990 4991 ZFS_MODULE_PARAM(zfs, zfs_, max_recordsize, UINT, ZMOD_RW, 4992 "Max allowed record size"); 4993 4994 ZFS_MODULE_PARAM(zfs, zfs_, allow_redacted_dataset_mount, INT, ZMOD_RW, 4995 "Allow mounting of redacted datasets"); 4996 4997 ZFS_MODULE_PARAM(zfs, zfs_, snapshot_history_enabled, INT, ZMOD_RW, 4998 "Include snapshot events in pool history/events"); 4999 5000 EXPORT_SYMBOL(dsl_dataset_hold); 5001 EXPORT_SYMBOL(dsl_dataset_hold_flags); 5002 EXPORT_SYMBOL(dsl_dataset_hold_obj); 5003 EXPORT_SYMBOL(dsl_dataset_hold_obj_flags); 5004 EXPORT_SYMBOL(dsl_dataset_own); 5005 EXPORT_SYMBOL(dsl_dataset_own_obj); 5006 EXPORT_SYMBOL(dsl_dataset_name); 5007 EXPORT_SYMBOL(dsl_dataset_rele); 5008 EXPORT_SYMBOL(dsl_dataset_rele_flags); 5009 EXPORT_SYMBOL(dsl_dataset_disown); 5010 EXPORT_SYMBOL(dsl_dataset_tryown); 5011 EXPORT_SYMBOL(dsl_dataset_create_sync); 5012 EXPORT_SYMBOL(dsl_dataset_create_sync_dd); 5013 EXPORT_SYMBOL(dsl_dataset_snapshot_check); 5014 EXPORT_SYMBOL(dsl_dataset_snapshot_sync); 5015 EXPORT_SYMBOL(dsl_dataset_promote); 5016 EXPORT_SYMBOL(dsl_dataset_user_hold); 5017 EXPORT_SYMBOL(dsl_dataset_user_release); 5018 EXPORT_SYMBOL(dsl_dataset_get_holds); 5019 EXPORT_SYMBOL(dsl_dataset_get_blkptr); 5020 EXPORT_SYMBOL(dsl_dataset_get_spa); 5021 EXPORT_SYMBOL(dsl_dataset_modified_since_snap); 5022 EXPORT_SYMBOL(dsl_dataset_space_written); 5023 EXPORT_SYMBOL(dsl_dataset_space_wouldfree); 5024 EXPORT_SYMBOL(dsl_dataset_sync); 5025 EXPORT_SYMBOL(dsl_dataset_block_born); 5026 EXPORT_SYMBOL(dsl_dataset_block_kill); 5027 EXPORT_SYMBOL(dsl_dataset_dirty); 5028 EXPORT_SYMBOL(dsl_dataset_stats); 5029 EXPORT_SYMBOL(dsl_dataset_fast_stat); 5030 EXPORT_SYMBOL(dsl_dataset_space); 5031 EXPORT_SYMBOL(dsl_dataset_fsid_guid); 5032 EXPORT_SYMBOL(dsl_dsobj_to_dsname); 5033 EXPORT_SYMBOL(dsl_dataset_check_quota); 5034 EXPORT_SYMBOL(dsl_dataset_clone_swap_check_impl); 5035 EXPORT_SYMBOL(dsl_dataset_clone_swap_sync_impl); 5036