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