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