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