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