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 do not allow the recordsize to be set larger than zfs_max_recordsize 77 * (default 1MB). Larger blocks can be created by changing this tunable, 78 * and pools with larger blocks can always be imported and used, regardless 79 * of this setting. 80 */ 81 int zfs_max_recordsize = 1 * 1024 * 1024; 82 int zfs_allow_redacted_dataset_mount = 0; 83 84 #define SWITCH64(x, y) \ 85 { \ 86 uint64_t __tmp = (x); \ 87 (x) = (y); \ 88 (y) = __tmp; \ 89 } 90 91 #define DS_REF_MAX (1ULL << 62) 92 93 extern inline dsl_dataset_phys_t *dsl_dataset_phys(dsl_dataset_t *ds); 94 95 static void dsl_dataset_set_remap_deadlist_object(dsl_dataset_t *ds, 96 uint64_t obj, dmu_tx_t *tx); 97 static void dsl_dataset_unset_remap_deadlist_object(dsl_dataset_t *ds, 98 dmu_tx_t *tx); 99 100 static void unload_zfeature(dsl_dataset_t *ds, spa_feature_t f); 101 102 extern int spa_asize_inflation; 103 104 static zil_header_t zero_zil; 105 106 /* 107 * Figure out how much of this delta should be propagated to the dsl_dir 108 * layer. If there's a refreservation, that space has already been 109 * partially accounted for in our ancestors. 110 */ 111 static int64_t 112 parent_delta(dsl_dataset_t *ds, int64_t delta) 113 { 114 dsl_dataset_phys_t *ds_phys; 115 uint64_t old_bytes, new_bytes; 116 117 if (ds->ds_reserved == 0) 118 return (delta); 119 120 ds_phys = dsl_dataset_phys(ds); 121 old_bytes = MAX(ds_phys->ds_unique_bytes, ds->ds_reserved); 122 new_bytes = MAX(ds_phys->ds_unique_bytes + delta, ds->ds_reserved); 123 124 ASSERT3U(ABS((int64_t)(new_bytes - old_bytes)), <=, ABS(delta)); 125 return (new_bytes - old_bytes); 126 } 127 128 void 129 dsl_dataset_block_born(dsl_dataset_t *ds, const blkptr_t *bp, dmu_tx_t *tx) 130 { 131 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 132 int used = bp_get_dsize_sync(spa, bp); 133 int compressed = BP_GET_PSIZE(bp); 134 int uncompressed = BP_GET_UCSIZE(bp); 135 int64_t delta; 136 spa_feature_t f; 137 138 dprintf_bp(bp, "ds=%p", ds); 139 140 ASSERT(dmu_tx_is_syncing(tx)); 141 /* It could have been compressed away to nothing */ 142 if (BP_IS_HOLE(bp) || BP_IS_REDACTED(bp)) 143 return; 144 ASSERT(BP_GET_TYPE(bp) != DMU_OT_NONE); 145 ASSERT(DMU_OT_IS_VALID(BP_GET_TYPE(bp))); 146 if (ds == NULL) { 147 dsl_pool_mos_diduse_space(tx->tx_pool, 148 used, compressed, uncompressed); 149 return; 150 } 151 152 ASSERT3U(bp->blk_birth, >, dsl_dataset_phys(ds)->ds_prev_snap_txg); 153 dmu_buf_will_dirty(ds->ds_dbuf, tx); 154 mutex_enter(&ds->ds_lock); 155 delta = parent_delta(ds, used); 156 dsl_dataset_phys(ds)->ds_referenced_bytes += used; 157 dsl_dataset_phys(ds)->ds_compressed_bytes += compressed; 158 dsl_dataset_phys(ds)->ds_uncompressed_bytes += uncompressed; 159 dsl_dataset_phys(ds)->ds_unique_bytes += used; 160 161 if (BP_GET_LSIZE(bp) > SPA_OLD_MAXBLOCKSIZE) { 162 ds->ds_feature_activation[SPA_FEATURE_LARGE_BLOCKS] = 163 (void *)B_TRUE; 164 } 165 166 167 f = zio_checksum_to_feature(BP_GET_CHECKSUM(bp)); 168 if (f != SPA_FEATURE_NONE) { 169 ASSERT3S(spa_feature_table[f].fi_type, ==, 170 ZFEATURE_TYPE_BOOLEAN); 171 ds->ds_feature_activation[f] = (void *)B_TRUE; 172 } 173 174 f = zio_compress_to_feature(BP_GET_COMPRESS(bp)); 175 if (f != SPA_FEATURE_NONE) { 176 ASSERT3S(spa_feature_table[f].fi_type, ==, 177 ZFEATURE_TYPE_BOOLEAN); 178 ds->ds_feature_activation[f] = (void *)B_TRUE; 179 } 180 181 /* 182 * Track block for livelist, but ignore embedded blocks because 183 * they do not need to be freed. 184 */ 185 if (dsl_deadlist_is_open(&ds->ds_dir->dd_livelist) && 186 bp->blk_birth > ds->ds_dir->dd_origin_txg && 187 !(BP_IS_EMBEDDED(bp))) { 188 ASSERT(dsl_dir_is_clone(ds->ds_dir)); 189 ASSERT(spa_feature_is_enabled(spa, 190 SPA_FEATURE_LIVELIST)); 191 bplist_append(&ds->ds_dir->dd_pending_allocs, bp); 192 } 193 194 mutex_exit(&ds->ds_lock); 195 dsl_dir_diduse_transfer_space(ds->ds_dir, delta, 196 compressed, uncompressed, used, 197 DD_USED_REFRSRV, DD_USED_HEAD, tx); 198 } 199 200 /* 201 * Called when the specified segment has been remapped, and is thus no 202 * longer referenced in the head dataset. The vdev must be indirect. 203 * 204 * If the segment is referenced by a snapshot, put it on the remap deadlist. 205 * Otherwise, add this segment to the obsolete spacemap. 206 */ 207 void 208 dsl_dataset_block_remapped(dsl_dataset_t *ds, uint64_t vdev, uint64_t offset, 209 uint64_t size, uint64_t birth, dmu_tx_t *tx) 210 { 211 spa_t *spa = ds->ds_dir->dd_pool->dp_spa; 212 213 ASSERT(dmu_tx_is_syncing(tx)); 214 ASSERT(birth <= tx->tx_txg); 215 ASSERT(!ds->ds_is_snapshot); 216 217 if (birth > dsl_dataset_phys(ds)->ds_prev_snap_txg) { 218 spa_vdev_indirect_mark_obsolete(spa, vdev, offset, size, tx); 219 } else { 220 blkptr_t fakebp; 221 dva_t *dva = &fakebp.blk_dva[0]; 222 223 ASSERT(ds != NULL); 224 225 mutex_enter(&ds->ds_remap_deadlist_lock); 226 if (!dsl_dataset_remap_deadlist_exists(ds)) { 227 dsl_dataset_create_remap_deadlist(ds, tx); 228 } 229 mutex_exit(&ds->ds_remap_deadlist_lock); 230 231 BP_ZERO(&fakebp); 232 fakebp.blk_birth = birth; 233 DVA_SET_VDEV(dva, vdev); 234 DVA_SET_OFFSET(dva, offset); 235 DVA_SET_ASIZE(dva, size); 236 dsl_deadlist_insert(&ds->ds_remap_deadlist, &fakebp, B_FALSE, 237 tx); 238 } 239 } 240 241 int 242 dsl_dataset_block_kill(dsl_dataset_t *ds, const blkptr_t *bp, dmu_tx_t *tx, 243 boolean_t async) 244 { 245 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 246 247 int used = bp_get_dsize_sync(spa, bp); 248 int compressed = BP_GET_PSIZE(bp); 249 int uncompressed = BP_GET_UCSIZE(bp); 250 251 if (BP_IS_HOLE(bp) || BP_IS_REDACTED(bp)) 252 return (0); 253 254 ASSERT(dmu_tx_is_syncing(tx)); 255 ASSERT(bp->blk_birth <= tx->tx_txg); 256 257 if (ds == NULL) { 258 dsl_free(tx->tx_pool, tx->tx_txg, bp); 259 dsl_pool_mos_diduse_space(tx->tx_pool, 260 -used, -compressed, -uncompressed); 261 return (used); 262 } 263 ASSERT3P(tx->tx_pool, ==, ds->ds_dir->dd_pool); 264 265 ASSERT(!ds->ds_is_snapshot); 266 dmu_buf_will_dirty(ds->ds_dbuf, tx); 267 268 /* 269 * Track block for livelist, but ignore embedded blocks because 270 * they do not need to be freed. 271 */ 272 if (dsl_deadlist_is_open(&ds->ds_dir->dd_livelist) && 273 bp->blk_birth > ds->ds_dir->dd_origin_txg && 274 !(BP_IS_EMBEDDED(bp))) { 275 ASSERT(dsl_dir_is_clone(ds->ds_dir)); 276 ASSERT(spa_feature_is_enabled(spa, 277 SPA_FEATURE_LIVELIST)); 278 bplist_append(&ds->ds_dir->dd_pending_frees, bp); 279 } 280 281 if (bp->blk_birth > dsl_dataset_phys(ds)->ds_prev_snap_txg) { 282 int64_t delta; 283 284 dprintf_bp(bp, "freeing ds=%llu", (u_longlong_t)ds->ds_object); 285 dsl_free(tx->tx_pool, tx->tx_txg, bp); 286 287 mutex_enter(&ds->ds_lock); 288 ASSERT(dsl_dataset_phys(ds)->ds_unique_bytes >= used || 289 !DS_UNIQUE_IS_ACCURATE(ds)); 290 delta = parent_delta(ds, -used); 291 dsl_dataset_phys(ds)->ds_unique_bytes -= used; 292 mutex_exit(&ds->ds_lock); 293 dsl_dir_diduse_transfer_space(ds->ds_dir, 294 delta, -compressed, -uncompressed, -used, 295 DD_USED_REFRSRV, DD_USED_HEAD, tx); 296 } else { 297 dprintf_bp(bp, "putting on dead list: %s", ""); 298 if (async) { 299 /* 300 * We are here as part of zio's write done callback, 301 * which means we're a zio interrupt thread. We can't 302 * call dsl_deadlist_insert() now because it may block 303 * waiting for I/O. Instead, put bp on the deferred 304 * queue and let dsl_pool_sync() finish the job. 305 */ 306 bplist_append(&ds->ds_pending_deadlist, bp); 307 } else { 308 dsl_deadlist_insert(&ds->ds_deadlist, bp, B_FALSE, tx); 309 } 310 ASSERT3U(ds->ds_prev->ds_object, ==, 311 dsl_dataset_phys(ds)->ds_prev_snap_obj); 312 ASSERT(dsl_dataset_phys(ds->ds_prev)->ds_num_children > 0); 313 /* if (bp->blk_birth > prev prev snap txg) prev unique += bs */ 314 if (dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj == 315 ds->ds_object && bp->blk_birth > 316 dsl_dataset_phys(ds->ds_prev)->ds_prev_snap_txg) { 317 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); 318 mutex_enter(&ds->ds_prev->ds_lock); 319 dsl_dataset_phys(ds->ds_prev)->ds_unique_bytes += used; 320 mutex_exit(&ds->ds_prev->ds_lock); 321 } 322 if (bp->blk_birth > ds->ds_dir->dd_origin_txg) { 323 dsl_dir_transfer_space(ds->ds_dir, used, 324 DD_USED_HEAD, DD_USED_SNAP, tx); 325 } 326 } 327 328 dsl_bookmark_block_killed(ds, bp, tx); 329 330 mutex_enter(&ds->ds_lock); 331 ASSERT3U(dsl_dataset_phys(ds)->ds_referenced_bytes, >=, used); 332 dsl_dataset_phys(ds)->ds_referenced_bytes -= used; 333 ASSERT3U(dsl_dataset_phys(ds)->ds_compressed_bytes, >=, compressed); 334 dsl_dataset_phys(ds)->ds_compressed_bytes -= compressed; 335 ASSERT3U(dsl_dataset_phys(ds)->ds_uncompressed_bytes, >=, uncompressed); 336 dsl_dataset_phys(ds)->ds_uncompressed_bytes -= uncompressed; 337 mutex_exit(&ds->ds_lock); 338 339 return (used); 340 } 341 342 struct feature_type_uint64_array_arg { 343 uint64_t length; 344 uint64_t *array; 345 }; 346 347 static void 348 unload_zfeature(dsl_dataset_t *ds, spa_feature_t f) 349 { 350 switch (spa_feature_table[f].fi_type) { 351 case ZFEATURE_TYPE_BOOLEAN: 352 break; 353 case ZFEATURE_TYPE_UINT64_ARRAY: 354 { 355 struct feature_type_uint64_array_arg *ftuaa = ds->ds_feature[f]; 356 kmem_free(ftuaa->array, ftuaa->length * sizeof (uint64_t)); 357 kmem_free(ftuaa, sizeof (*ftuaa)); 358 break; 359 } 360 default: 361 panic("Invalid zfeature type %d", spa_feature_table[f].fi_type); 362 } 363 } 364 365 static int 366 load_zfeature(objset_t *mos, dsl_dataset_t *ds, spa_feature_t f) 367 { 368 int err = 0; 369 switch (spa_feature_table[f].fi_type) { 370 case ZFEATURE_TYPE_BOOLEAN: 371 err = zap_contains(mos, ds->ds_object, 372 spa_feature_table[f].fi_guid); 373 if (err == 0) { 374 ds->ds_feature[f] = (void *)B_TRUE; 375 } else { 376 ASSERT3U(err, ==, ENOENT); 377 err = 0; 378 } 379 break; 380 case ZFEATURE_TYPE_UINT64_ARRAY: 381 { 382 uint64_t int_size, num_int; 383 uint64_t *data; 384 err = zap_length(mos, ds->ds_object, 385 spa_feature_table[f].fi_guid, &int_size, &num_int); 386 if (err != 0) { 387 ASSERT3U(err, ==, ENOENT); 388 err = 0; 389 break; 390 } 391 ASSERT3U(int_size, ==, sizeof (uint64_t)); 392 data = kmem_alloc(int_size * num_int, KM_SLEEP); 393 VERIFY0(zap_lookup(mos, ds->ds_object, 394 spa_feature_table[f].fi_guid, int_size, num_int, data)); 395 struct feature_type_uint64_array_arg *ftuaa = 396 kmem_alloc(sizeof (*ftuaa), KM_SLEEP); 397 ftuaa->length = num_int; 398 ftuaa->array = data; 399 ds->ds_feature[f] = ftuaa; 400 break; 401 } 402 default: 403 panic("Invalid zfeature type %d", spa_feature_table[f].fi_type); 404 } 405 return (err); 406 } 407 408 /* 409 * We have to release the fsid synchronously or we risk that a subsequent 410 * mount of the same dataset will fail to unique_insert the fsid. This 411 * failure would manifest itself as the fsid of this dataset changing 412 * between mounts which makes NFS clients quite unhappy. 413 */ 414 static void 415 dsl_dataset_evict_sync(void *dbu) 416 { 417 dsl_dataset_t *ds = dbu; 418 419 ASSERT(ds->ds_owner == NULL); 420 421 unique_remove(ds->ds_fsid_guid); 422 } 423 424 static void 425 dsl_dataset_evict_async(void *dbu) 426 { 427 dsl_dataset_t *ds = dbu; 428 429 ASSERT(ds->ds_owner == NULL); 430 431 ds->ds_dbuf = NULL; 432 433 if (ds->ds_objset != NULL) 434 dmu_objset_evict(ds->ds_objset); 435 436 if (ds->ds_prev) { 437 dsl_dataset_rele(ds->ds_prev, ds); 438 ds->ds_prev = NULL; 439 } 440 441 dsl_bookmark_fini_ds(ds); 442 443 bplist_destroy(&ds->ds_pending_deadlist); 444 if (dsl_deadlist_is_open(&ds->ds_deadlist)) 445 dsl_deadlist_close(&ds->ds_deadlist); 446 if (dsl_deadlist_is_open(&ds->ds_remap_deadlist)) 447 dsl_deadlist_close(&ds->ds_remap_deadlist); 448 if (ds->ds_dir) 449 dsl_dir_async_rele(ds->ds_dir, ds); 450 451 ASSERT(!list_link_active(&ds->ds_synced_link)); 452 453 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 454 if (dsl_dataset_feature_is_active(ds, f)) 455 unload_zfeature(ds, f); 456 } 457 458 list_destroy(&ds->ds_prop_cbs); 459 mutex_destroy(&ds->ds_lock); 460 mutex_destroy(&ds->ds_opening_lock); 461 mutex_destroy(&ds->ds_sendstream_lock); 462 mutex_destroy(&ds->ds_remap_deadlist_lock); 463 zfs_refcount_destroy(&ds->ds_longholds); 464 rrw_destroy(&ds->ds_bp_rwlock); 465 466 kmem_free(ds, sizeof (dsl_dataset_t)); 467 } 468 469 int 470 dsl_dataset_get_snapname(dsl_dataset_t *ds) 471 { 472 dsl_dataset_phys_t *headphys; 473 int err; 474 dmu_buf_t *headdbuf; 475 dsl_pool_t *dp = ds->ds_dir->dd_pool; 476 objset_t *mos = dp->dp_meta_objset; 477 478 if (ds->ds_snapname[0]) 479 return (0); 480 if (dsl_dataset_phys(ds)->ds_next_snap_obj == 0) 481 return (0); 482 483 err = dmu_bonus_hold(mos, dsl_dir_phys(ds->ds_dir)->dd_head_dataset_obj, 484 FTAG, &headdbuf); 485 if (err != 0) 486 return (err); 487 headphys = headdbuf->db_data; 488 err = zap_value_search(dp->dp_meta_objset, 489 headphys->ds_snapnames_zapobj, ds->ds_object, 0, ds->ds_snapname); 490 if (err != 0 && zfs_recover == B_TRUE) { 491 err = 0; 492 (void) snprintf(ds->ds_snapname, sizeof (ds->ds_snapname), 493 "SNAPOBJ=%llu-ERR=%d", 494 (unsigned long long)ds->ds_object, err); 495 } 496 dmu_buf_rele(headdbuf, FTAG); 497 return (err); 498 } 499 500 int 501 dsl_dataset_snap_lookup(dsl_dataset_t *ds, const char *name, uint64_t *value) 502 { 503 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 504 uint64_t snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj; 505 matchtype_t mt = 0; 506 int err; 507 508 if (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_CI_DATASET) 509 mt = MT_NORMALIZE; 510 511 err = zap_lookup_norm(mos, snapobj, name, 8, 1, 512 value, mt, NULL, 0, NULL); 513 if (err == ENOTSUP && (mt & MT_NORMALIZE)) 514 err = zap_lookup(mos, snapobj, name, 8, 1, value); 515 return (err); 516 } 517 518 int 519 dsl_dataset_snap_remove(dsl_dataset_t *ds, const char *name, dmu_tx_t *tx, 520 boolean_t adj_cnt) 521 { 522 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 523 uint64_t snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj; 524 matchtype_t mt = 0; 525 int err; 526 527 dsl_dir_snap_cmtime_update(ds->ds_dir); 528 529 if (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_CI_DATASET) 530 mt = MT_NORMALIZE; 531 532 err = zap_remove_norm(mos, snapobj, name, mt, tx); 533 if (err == ENOTSUP && (mt & MT_NORMALIZE)) 534 err = zap_remove(mos, snapobj, name, tx); 535 536 if (err == 0 && adj_cnt) 537 dsl_fs_ss_count_adjust(ds->ds_dir, -1, 538 DD_FIELD_SNAPSHOT_COUNT, tx); 539 540 return (err); 541 } 542 543 boolean_t 544 dsl_dataset_try_add_ref(dsl_pool_t *dp, dsl_dataset_t *ds, void *tag) 545 { 546 dmu_buf_t *dbuf = ds->ds_dbuf; 547 boolean_t result = B_FALSE; 548 549 if (dbuf != NULL && dmu_buf_try_add_ref(dbuf, dp->dp_meta_objset, 550 ds->ds_object, DMU_BONUS_BLKID, tag)) { 551 552 if (ds == dmu_buf_get_user(dbuf)) 553 result = B_TRUE; 554 else 555 dmu_buf_rele(dbuf, tag); 556 } 557 558 return (result); 559 } 560 561 int 562 dsl_dataset_hold_obj(dsl_pool_t *dp, uint64_t dsobj, void *tag, 563 dsl_dataset_t **dsp) 564 { 565 objset_t *mos = dp->dp_meta_objset; 566 dmu_buf_t *dbuf; 567 dsl_dataset_t *ds; 568 int err; 569 dmu_object_info_t doi; 570 571 ASSERT(dsl_pool_config_held(dp)); 572 573 err = dmu_bonus_hold(mos, dsobj, tag, &dbuf); 574 if (err != 0) 575 return (err); 576 577 /* Make sure dsobj has the correct object type. */ 578 dmu_object_info_from_db(dbuf, &doi); 579 if (doi.doi_bonus_type != DMU_OT_DSL_DATASET) { 580 dmu_buf_rele(dbuf, tag); 581 return (SET_ERROR(EINVAL)); 582 } 583 584 ds = dmu_buf_get_user(dbuf); 585 if (ds == NULL) { 586 dsl_dataset_t *winner = NULL; 587 588 ds = kmem_zalloc(sizeof (dsl_dataset_t), KM_SLEEP); 589 ds->ds_dbuf = dbuf; 590 ds->ds_object = dsobj; 591 ds->ds_is_snapshot = dsl_dataset_phys(ds)->ds_num_children != 0; 592 list_link_init(&ds->ds_synced_link); 593 594 err = dsl_dir_hold_obj(dp, dsl_dataset_phys(ds)->ds_dir_obj, 595 NULL, ds, &ds->ds_dir); 596 if (err != 0) { 597 kmem_free(ds, sizeof (dsl_dataset_t)); 598 dmu_buf_rele(dbuf, tag); 599 return (err); 600 } 601 602 mutex_init(&ds->ds_lock, NULL, MUTEX_DEFAULT, NULL); 603 mutex_init(&ds->ds_opening_lock, NULL, MUTEX_DEFAULT, NULL); 604 mutex_init(&ds->ds_sendstream_lock, NULL, MUTEX_DEFAULT, NULL); 605 mutex_init(&ds->ds_remap_deadlist_lock, 606 NULL, MUTEX_DEFAULT, NULL); 607 rrw_init(&ds->ds_bp_rwlock, B_FALSE); 608 zfs_refcount_create(&ds->ds_longholds); 609 610 bplist_create(&ds->ds_pending_deadlist); 611 612 list_create(&ds->ds_sendstreams, sizeof (dmu_sendstatus_t), 613 offsetof(dmu_sendstatus_t, dss_link)); 614 615 list_create(&ds->ds_prop_cbs, sizeof (dsl_prop_cb_record_t), 616 offsetof(dsl_prop_cb_record_t, cbr_ds_node)); 617 618 if (doi.doi_type == DMU_OTN_ZAP_METADATA) { 619 spa_feature_t f; 620 621 for (f = 0; f < SPA_FEATURES; f++) { 622 if (!(spa_feature_table[f].fi_flags & 623 ZFEATURE_FLAG_PER_DATASET)) 624 continue; 625 err = load_zfeature(mos, ds, f); 626 } 627 } 628 629 if (!ds->ds_is_snapshot) { 630 ds->ds_snapname[0] = '\0'; 631 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) { 632 err = dsl_dataset_hold_obj(dp, 633 dsl_dataset_phys(ds)->ds_prev_snap_obj, 634 ds, &ds->ds_prev); 635 } 636 err = dsl_bookmark_init_ds(ds); 637 } else { 638 if (zfs_flags & ZFS_DEBUG_SNAPNAMES) 639 err = dsl_dataset_get_snapname(ds); 640 if (err == 0 && 641 dsl_dataset_phys(ds)->ds_userrefs_obj != 0) { 642 err = zap_count( 643 ds->ds_dir->dd_pool->dp_meta_objset, 644 dsl_dataset_phys(ds)->ds_userrefs_obj, 645 &ds->ds_userrefs); 646 } 647 } 648 649 if (err == 0 && !ds->ds_is_snapshot) { 650 err = dsl_prop_get_int_ds(ds, 651 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 652 &ds->ds_reserved); 653 if (err == 0) { 654 err = dsl_prop_get_int_ds(ds, 655 zfs_prop_to_name(ZFS_PROP_REFQUOTA), 656 &ds->ds_quota); 657 } 658 } else { 659 ds->ds_reserved = ds->ds_quota = 0; 660 } 661 662 if (err == 0 && ds->ds_dir->dd_crypto_obj != 0 && 663 ds->ds_is_snapshot && 664 zap_contains(mos, dsobj, DS_FIELD_IVSET_GUID) != 0) { 665 dp->dp_spa->spa_errata = 666 ZPOOL_ERRATA_ZOL_8308_ENCRYPTION; 667 } 668 669 dsl_deadlist_open(&ds->ds_deadlist, 670 mos, dsl_dataset_phys(ds)->ds_deadlist_obj); 671 uint64_t remap_deadlist_obj = 672 dsl_dataset_get_remap_deadlist_object(ds); 673 if (remap_deadlist_obj != 0) { 674 dsl_deadlist_open(&ds->ds_remap_deadlist, mos, 675 remap_deadlist_obj); 676 } 677 678 dmu_buf_init_user(&ds->ds_dbu, dsl_dataset_evict_sync, 679 dsl_dataset_evict_async, &ds->ds_dbuf); 680 if (err == 0) 681 winner = dmu_buf_set_user_ie(dbuf, &ds->ds_dbu); 682 683 if (err != 0 || winner != NULL) { 684 bplist_destroy(&ds->ds_pending_deadlist); 685 dsl_deadlist_close(&ds->ds_deadlist); 686 if (dsl_deadlist_is_open(&ds->ds_remap_deadlist)) 687 dsl_deadlist_close(&ds->ds_remap_deadlist); 688 dsl_bookmark_fini_ds(ds); 689 if (ds->ds_prev) 690 dsl_dataset_rele(ds->ds_prev, ds); 691 dsl_dir_rele(ds->ds_dir, ds); 692 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 693 if (dsl_dataset_feature_is_active(ds, f)) 694 unload_zfeature(ds, f); 695 } 696 697 list_destroy(&ds->ds_prop_cbs); 698 list_destroy(&ds->ds_sendstreams); 699 mutex_destroy(&ds->ds_lock); 700 mutex_destroy(&ds->ds_opening_lock); 701 mutex_destroy(&ds->ds_sendstream_lock); 702 mutex_destroy(&ds->ds_remap_deadlist_lock); 703 zfs_refcount_destroy(&ds->ds_longholds); 704 rrw_destroy(&ds->ds_bp_rwlock); 705 kmem_free(ds, sizeof (dsl_dataset_t)); 706 if (err != 0) { 707 dmu_buf_rele(dbuf, tag); 708 return (err); 709 } 710 ds = winner; 711 } else { 712 ds->ds_fsid_guid = 713 unique_insert(dsl_dataset_phys(ds)->ds_fsid_guid); 714 if (ds->ds_fsid_guid != 715 dsl_dataset_phys(ds)->ds_fsid_guid) { 716 zfs_dbgmsg("ds_fsid_guid changed from " 717 "%llx to %llx for pool %s dataset id %llu", 718 (long long) 719 dsl_dataset_phys(ds)->ds_fsid_guid, 720 (long long)ds->ds_fsid_guid, 721 spa_name(dp->dp_spa), 722 (u_longlong_t)dsobj); 723 } 724 } 725 } 726 727 ASSERT3P(ds->ds_dbuf, ==, dbuf); 728 ASSERT3P(dsl_dataset_phys(ds), ==, dbuf->db_data); 729 ASSERT(dsl_dataset_phys(ds)->ds_prev_snap_obj != 0 || 730 spa_version(dp->dp_spa) < SPA_VERSION_ORIGIN || 731 dp->dp_origin_snap == NULL || ds == dp->dp_origin_snap); 732 *dsp = ds; 733 734 return (0); 735 } 736 737 int 738 dsl_dataset_create_key_mapping(dsl_dataset_t *ds) 739 { 740 dsl_dir_t *dd = ds->ds_dir; 741 742 if (dd->dd_crypto_obj == 0) 743 return (0); 744 745 return (spa_keystore_create_mapping(dd->dd_pool->dp_spa, 746 ds, ds, &ds->ds_key_mapping)); 747 } 748 749 int 750 dsl_dataset_hold_obj_flags(dsl_pool_t *dp, uint64_t dsobj, 751 ds_hold_flags_t flags, void *tag, dsl_dataset_t **dsp) 752 { 753 int err; 754 755 err = dsl_dataset_hold_obj(dp, dsobj, tag, dsp); 756 if (err != 0) 757 return (err); 758 759 ASSERT3P(*dsp, !=, NULL); 760 761 if (flags & DS_HOLD_FLAG_DECRYPT) { 762 err = dsl_dataset_create_key_mapping(*dsp); 763 if (err != 0) 764 dsl_dataset_rele(*dsp, tag); 765 } 766 767 return (err); 768 } 769 770 int 771 dsl_dataset_hold_flags(dsl_pool_t *dp, const char *name, ds_hold_flags_t flags, 772 void *tag, dsl_dataset_t **dsp) 773 { 774 dsl_dir_t *dd; 775 const char *snapname; 776 uint64_t obj; 777 int err = 0; 778 dsl_dataset_t *ds; 779 780 err = dsl_dir_hold(dp, name, FTAG, &dd, &snapname); 781 if (err != 0) 782 return (err); 783 784 ASSERT(dsl_pool_config_held(dp)); 785 obj = dsl_dir_phys(dd)->dd_head_dataset_obj; 786 if (obj != 0) 787 err = dsl_dataset_hold_obj_flags(dp, obj, flags, tag, &ds); 788 else 789 err = SET_ERROR(ENOENT); 790 791 /* we may be looking for a snapshot */ 792 if (err == 0 && snapname != NULL) { 793 dsl_dataset_t *snap_ds; 794 795 if (*snapname++ != '@') { 796 dsl_dataset_rele_flags(ds, flags, tag); 797 dsl_dir_rele(dd, FTAG); 798 return (SET_ERROR(ENOENT)); 799 } 800 801 dprintf("looking for snapshot '%s'\n", snapname); 802 err = dsl_dataset_snap_lookup(ds, snapname, &obj); 803 if (err == 0) { 804 err = dsl_dataset_hold_obj_flags(dp, obj, flags, tag, 805 &snap_ds); 806 } 807 dsl_dataset_rele_flags(ds, flags, tag); 808 809 if (err == 0) { 810 mutex_enter(&snap_ds->ds_lock); 811 if (snap_ds->ds_snapname[0] == 0) 812 (void) strlcpy(snap_ds->ds_snapname, snapname, 813 sizeof (snap_ds->ds_snapname)); 814 mutex_exit(&snap_ds->ds_lock); 815 ds = snap_ds; 816 } 817 } 818 if (err == 0) 819 *dsp = ds; 820 dsl_dir_rele(dd, FTAG); 821 return (err); 822 } 823 824 int 825 dsl_dataset_hold(dsl_pool_t *dp, const char *name, void *tag, 826 dsl_dataset_t **dsp) 827 { 828 return (dsl_dataset_hold_flags(dp, name, 0, tag, dsp)); 829 } 830 831 static int 832 dsl_dataset_own_obj_impl(dsl_pool_t *dp, uint64_t dsobj, ds_hold_flags_t flags, 833 void *tag, boolean_t override, dsl_dataset_t **dsp) 834 { 835 int err = dsl_dataset_hold_obj_flags(dp, dsobj, flags, tag, dsp); 836 if (err != 0) 837 return (err); 838 if (!dsl_dataset_tryown(*dsp, tag, override)) { 839 dsl_dataset_rele_flags(*dsp, flags, tag); 840 *dsp = NULL; 841 return (SET_ERROR(EBUSY)); 842 } 843 return (0); 844 } 845 846 847 int 848 dsl_dataset_own_obj(dsl_pool_t *dp, uint64_t dsobj, ds_hold_flags_t flags, 849 void *tag, dsl_dataset_t **dsp) 850 { 851 return (dsl_dataset_own_obj_impl(dp, dsobj, flags, tag, B_FALSE, dsp)); 852 } 853 854 int 855 dsl_dataset_own_obj_force(dsl_pool_t *dp, uint64_t dsobj, 856 ds_hold_flags_t flags, void *tag, dsl_dataset_t **dsp) 857 { 858 return (dsl_dataset_own_obj_impl(dp, dsobj, flags, tag, B_TRUE, dsp)); 859 } 860 861 static int 862 dsl_dataset_own_impl(dsl_pool_t *dp, const char *name, ds_hold_flags_t flags, 863 void *tag, boolean_t override, dsl_dataset_t **dsp) 864 { 865 int err = dsl_dataset_hold_flags(dp, name, flags, tag, dsp); 866 if (err != 0) 867 return (err); 868 if (!dsl_dataset_tryown(*dsp, tag, override)) { 869 dsl_dataset_rele_flags(*dsp, flags, tag); 870 return (SET_ERROR(EBUSY)); 871 } 872 return (0); 873 } 874 875 int 876 dsl_dataset_own_force(dsl_pool_t *dp, const char *name, ds_hold_flags_t flags, 877 void *tag, dsl_dataset_t **dsp) 878 { 879 return (dsl_dataset_own_impl(dp, name, flags, tag, B_TRUE, dsp)); 880 } 881 882 int 883 dsl_dataset_own(dsl_pool_t *dp, const char *name, ds_hold_flags_t flags, 884 void *tag, dsl_dataset_t **dsp) 885 { 886 return (dsl_dataset_own_impl(dp, name, flags, tag, B_FALSE, dsp)); 887 } 888 889 /* 890 * See the comment above dsl_pool_hold() for details. In summary, a long 891 * hold is used to prevent destruction of a dataset while the pool hold 892 * is dropped, allowing other concurrent operations (e.g. spa_sync()). 893 * 894 * The dataset and pool must be held when this function is called. After it 895 * is called, the pool hold may be released while the dataset is still held 896 * and accessed. 897 */ 898 void 899 dsl_dataset_long_hold(dsl_dataset_t *ds, void *tag) 900 { 901 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool)); 902 (void) zfs_refcount_add(&ds->ds_longholds, tag); 903 } 904 905 void 906 dsl_dataset_long_rele(dsl_dataset_t *ds, void *tag) 907 { 908 (void) zfs_refcount_remove(&ds->ds_longholds, tag); 909 } 910 911 /* Return B_TRUE if there are any long holds on this dataset. */ 912 boolean_t 913 dsl_dataset_long_held(dsl_dataset_t *ds) 914 { 915 return (!zfs_refcount_is_zero(&ds->ds_longholds)); 916 } 917 918 void 919 dsl_dataset_name(dsl_dataset_t *ds, char *name) 920 { 921 if (ds == NULL) { 922 (void) strlcpy(name, "mos", ZFS_MAX_DATASET_NAME_LEN); 923 } else { 924 dsl_dir_name(ds->ds_dir, name); 925 VERIFY0(dsl_dataset_get_snapname(ds)); 926 if (ds->ds_snapname[0]) { 927 VERIFY3U(strlcat(name, "@", ZFS_MAX_DATASET_NAME_LEN), 928 <, ZFS_MAX_DATASET_NAME_LEN); 929 /* 930 * We use a "recursive" mutex so that we 931 * can call dprintf_ds() with ds_lock held. 932 */ 933 if (!MUTEX_HELD(&ds->ds_lock)) { 934 mutex_enter(&ds->ds_lock); 935 VERIFY3U(strlcat(name, ds->ds_snapname, 936 ZFS_MAX_DATASET_NAME_LEN), <, 937 ZFS_MAX_DATASET_NAME_LEN); 938 mutex_exit(&ds->ds_lock); 939 } else { 940 VERIFY3U(strlcat(name, ds->ds_snapname, 941 ZFS_MAX_DATASET_NAME_LEN), <, 942 ZFS_MAX_DATASET_NAME_LEN); 943 } 944 } 945 } 946 } 947 948 int 949 dsl_dataset_namelen(dsl_dataset_t *ds) 950 { 951 VERIFY0(dsl_dataset_get_snapname(ds)); 952 mutex_enter(&ds->ds_lock); 953 int len = strlen(ds->ds_snapname); 954 mutex_exit(&ds->ds_lock); 955 /* add '@' if ds is a snap */ 956 if (len > 0) 957 len++; 958 len += dsl_dir_namelen(ds->ds_dir); 959 return (len); 960 } 961 962 void 963 dsl_dataset_rele(dsl_dataset_t *ds, void *tag) 964 { 965 dmu_buf_rele(ds->ds_dbuf, tag); 966 } 967 968 void 969 dsl_dataset_remove_key_mapping(dsl_dataset_t *ds) 970 { 971 dsl_dir_t *dd = ds->ds_dir; 972 973 if (dd == NULL || dd->dd_crypto_obj == 0) 974 return; 975 976 (void) spa_keystore_remove_mapping(dd->dd_pool->dp_spa, 977 ds->ds_object, ds); 978 } 979 980 void 981 dsl_dataset_rele_flags(dsl_dataset_t *ds, ds_hold_flags_t flags, void *tag) 982 { 983 if (flags & DS_HOLD_FLAG_DECRYPT) 984 dsl_dataset_remove_key_mapping(ds); 985 986 dsl_dataset_rele(ds, tag); 987 } 988 989 void 990 dsl_dataset_disown(dsl_dataset_t *ds, ds_hold_flags_t flags, void *tag) 991 { 992 ASSERT3P(ds->ds_owner, ==, tag); 993 ASSERT(ds->ds_dbuf != NULL); 994 995 mutex_enter(&ds->ds_lock); 996 ds->ds_owner = NULL; 997 mutex_exit(&ds->ds_lock); 998 dsl_dataset_long_rele(ds, tag); 999 dsl_dataset_rele_flags(ds, flags, tag); 1000 } 1001 1002 boolean_t 1003 dsl_dataset_tryown(dsl_dataset_t *ds, void *tag, boolean_t override) 1004 { 1005 boolean_t gotit = FALSE; 1006 1007 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool)); 1008 mutex_enter(&ds->ds_lock); 1009 if (ds->ds_owner == NULL && (override || !(DS_IS_INCONSISTENT(ds) || 1010 (dsl_dataset_feature_is_active(ds, 1011 SPA_FEATURE_REDACTED_DATASETS) && 1012 !zfs_allow_redacted_dataset_mount)))) { 1013 ds->ds_owner = tag; 1014 dsl_dataset_long_hold(ds, tag); 1015 gotit = TRUE; 1016 } 1017 mutex_exit(&ds->ds_lock); 1018 return (gotit); 1019 } 1020 1021 boolean_t 1022 dsl_dataset_has_owner(dsl_dataset_t *ds) 1023 { 1024 boolean_t rv; 1025 mutex_enter(&ds->ds_lock); 1026 rv = (ds->ds_owner != NULL); 1027 mutex_exit(&ds->ds_lock); 1028 return (rv); 1029 } 1030 1031 static boolean_t 1032 zfeature_active(spa_feature_t f, void *arg) 1033 { 1034 switch (spa_feature_table[f].fi_type) { 1035 case ZFEATURE_TYPE_BOOLEAN: { 1036 boolean_t val = (boolean_t)(uintptr_t)arg; 1037 ASSERT(val == B_FALSE || val == B_TRUE); 1038 return (val); 1039 } 1040 case ZFEATURE_TYPE_UINT64_ARRAY: 1041 /* 1042 * In this case, arg is a uint64_t array. The feature is active 1043 * if the array is non-null. 1044 */ 1045 return (arg != NULL); 1046 default: 1047 panic("Invalid zfeature type %d", spa_feature_table[f].fi_type); 1048 return (B_FALSE); 1049 } 1050 } 1051 1052 boolean_t 1053 dsl_dataset_feature_is_active(dsl_dataset_t *ds, spa_feature_t f) 1054 { 1055 return (zfeature_active(f, ds->ds_feature[f])); 1056 } 1057 1058 /* 1059 * The buffers passed out by this function are references to internal buffers; 1060 * they should not be freed by callers of this function, and they should not be 1061 * used after the dataset has been released. 1062 */ 1063 boolean_t 1064 dsl_dataset_get_uint64_array_feature(dsl_dataset_t *ds, spa_feature_t f, 1065 uint64_t *outlength, uint64_t **outp) 1066 { 1067 VERIFY(spa_feature_table[f].fi_type & ZFEATURE_TYPE_UINT64_ARRAY); 1068 if (!dsl_dataset_feature_is_active(ds, f)) { 1069 return (B_FALSE); 1070 } 1071 struct feature_type_uint64_array_arg *ftuaa = ds->ds_feature[f]; 1072 *outp = ftuaa->array; 1073 *outlength = ftuaa->length; 1074 return (B_TRUE); 1075 } 1076 1077 void 1078 dsl_dataset_activate_feature(uint64_t dsobj, spa_feature_t f, void *arg, 1079 dmu_tx_t *tx) 1080 { 1081 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 1082 objset_t *mos = dmu_tx_pool(tx)->dp_meta_objset; 1083 uint64_t zero = 0; 1084 1085 VERIFY(spa_feature_table[f].fi_flags & ZFEATURE_FLAG_PER_DATASET); 1086 1087 spa_feature_incr(spa, f, tx); 1088 dmu_object_zapify(mos, dsobj, DMU_OT_DSL_DATASET, tx); 1089 1090 switch (spa_feature_table[f].fi_type) { 1091 case ZFEATURE_TYPE_BOOLEAN: 1092 ASSERT3S((boolean_t)(uintptr_t)arg, ==, B_TRUE); 1093 VERIFY0(zap_add(mos, dsobj, spa_feature_table[f].fi_guid, 1094 sizeof (zero), 1, &zero, tx)); 1095 break; 1096 case ZFEATURE_TYPE_UINT64_ARRAY: 1097 { 1098 struct feature_type_uint64_array_arg *ftuaa = arg; 1099 VERIFY0(zap_add(mos, dsobj, spa_feature_table[f].fi_guid, 1100 sizeof (uint64_t), ftuaa->length, ftuaa->array, tx)); 1101 break; 1102 } 1103 default: 1104 panic("Invalid zfeature type %d", spa_feature_table[f].fi_type); 1105 } 1106 } 1107 1108 static void 1109 dsl_dataset_deactivate_feature_impl(dsl_dataset_t *ds, spa_feature_t f, 1110 dmu_tx_t *tx) 1111 { 1112 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 1113 objset_t *mos = dmu_tx_pool(tx)->dp_meta_objset; 1114 uint64_t dsobj = ds->ds_object; 1115 1116 VERIFY(spa_feature_table[f].fi_flags & ZFEATURE_FLAG_PER_DATASET); 1117 1118 VERIFY0(zap_remove(mos, dsobj, spa_feature_table[f].fi_guid, tx)); 1119 spa_feature_decr(spa, f, tx); 1120 ds->ds_feature[f] = NULL; 1121 } 1122 1123 void 1124 dsl_dataset_deactivate_feature(dsl_dataset_t *ds, spa_feature_t f, dmu_tx_t *tx) 1125 { 1126 unload_zfeature(ds, f); 1127 dsl_dataset_deactivate_feature_impl(ds, f, tx); 1128 } 1129 1130 uint64_t 1131 dsl_dataset_create_sync_dd(dsl_dir_t *dd, dsl_dataset_t *origin, 1132 dsl_crypto_params_t *dcp, uint64_t flags, dmu_tx_t *tx) 1133 { 1134 dsl_pool_t *dp = dd->dd_pool; 1135 dmu_buf_t *dbuf; 1136 dsl_dataset_phys_t *dsphys; 1137 uint64_t dsobj; 1138 objset_t *mos = dp->dp_meta_objset; 1139 1140 if (origin == NULL) 1141 origin = dp->dp_origin_snap; 1142 1143 ASSERT(origin == NULL || origin->ds_dir->dd_pool == dp); 1144 ASSERT(origin == NULL || dsl_dataset_phys(origin)->ds_num_children > 0); 1145 ASSERT(dmu_tx_is_syncing(tx)); 1146 ASSERT(dsl_dir_phys(dd)->dd_head_dataset_obj == 0); 1147 1148 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, 1149 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); 1150 VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); 1151 dmu_buf_will_dirty(dbuf, tx); 1152 dsphys = dbuf->db_data; 1153 bzero(dsphys, sizeof (dsl_dataset_phys_t)); 1154 dsphys->ds_dir_obj = dd->dd_object; 1155 dsphys->ds_flags = flags; 1156 dsphys->ds_fsid_guid = unique_create(); 1157 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, 1158 sizeof (dsphys->ds_guid)); 1159 dsphys->ds_snapnames_zapobj = 1160 zap_create_norm(mos, U8_TEXTPREP_TOUPPER, DMU_OT_DSL_DS_SNAP_MAP, 1161 DMU_OT_NONE, 0, tx); 1162 dsphys->ds_creation_time = gethrestime_sec(); 1163 dsphys->ds_creation_txg = tx->tx_txg == TXG_INITIAL ? 1 : tx->tx_txg; 1164 1165 if (origin == NULL) { 1166 dsphys->ds_deadlist_obj = dsl_deadlist_alloc(mos, tx); 1167 } else { 1168 dsl_dataset_t *ohds; /* head of the origin snapshot */ 1169 1170 dsphys->ds_prev_snap_obj = origin->ds_object; 1171 dsphys->ds_prev_snap_txg = 1172 dsl_dataset_phys(origin)->ds_creation_txg; 1173 dsphys->ds_referenced_bytes = 1174 dsl_dataset_phys(origin)->ds_referenced_bytes; 1175 dsphys->ds_compressed_bytes = 1176 dsl_dataset_phys(origin)->ds_compressed_bytes; 1177 dsphys->ds_uncompressed_bytes = 1178 dsl_dataset_phys(origin)->ds_uncompressed_bytes; 1179 rrw_enter(&origin->ds_bp_rwlock, RW_READER, FTAG); 1180 dsphys->ds_bp = dsl_dataset_phys(origin)->ds_bp; 1181 rrw_exit(&origin->ds_bp_rwlock, FTAG); 1182 1183 /* 1184 * Inherit flags that describe the dataset's contents 1185 * (INCONSISTENT) or properties (Case Insensitive). 1186 */ 1187 dsphys->ds_flags |= dsl_dataset_phys(origin)->ds_flags & 1188 (DS_FLAG_INCONSISTENT | DS_FLAG_CI_DATASET); 1189 1190 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 1191 if (zfeature_active(f, origin->ds_feature[f])) { 1192 dsl_dataset_activate_feature(dsobj, f, 1193 origin->ds_feature[f], tx); 1194 } 1195 } 1196 1197 dmu_buf_will_dirty(origin->ds_dbuf, tx); 1198 dsl_dataset_phys(origin)->ds_num_children++; 1199 1200 VERIFY0(dsl_dataset_hold_obj(dp, 1201 dsl_dir_phys(origin->ds_dir)->dd_head_dataset_obj, 1202 FTAG, &ohds)); 1203 dsphys->ds_deadlist_obj = dsl_deadlist_clone(&ohds->ds_deadlist, 1204 dsphys->ds_prev_snap_txg, dsphys->ds_prev_snap_obj, tx); 1205 dsl_dataset_rele(ohds, FTAG); 1206 1207 if (spa_version(dp->dp_spa) >= SPA_VERSION_NEXT_CLONES) { 1208 if (dsl_dataset_phys(origin)->ds_next_clones_obj == 0) { 1209 dsl_dataset_phys(origin)->ds_next_clones_obj = 1210 zap_create(mos, 1211 DMU_OT_NEXT_CLONES, DMU_OT_NONE, 0, tx); 1212 } 1213 VERIFY0(zap_add_int(mos, 1214 dsl_dataset_phys(origin)->ds_next_clones_obj, 1215 dsobj, tx)); 1216 } 1217 1218 dmu_buf_will_dirty(dd->dd_dbuf, tx); 1219 dsl_dir_phys(dd)->dd_origin_obj = origin->ds_object; 1220 if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 1221 if (dsl_dir_phys(origin->ds_dir)->dd_clones == 0) { 1222 dmu_buf_will_dirty(origin->ds_dir->dd_dbuf, tx); 1223 dsl_dir_phys(origin->ds_dir)->dd_clones = 1224 zap_create(mos, 1225 DMU_OT_DSL_CLONES, DMU_OT_NONE, 0, tx); 1226 } 1227 VERIFY0(zap_add_int(mos, 1228 dsl_dir_phys(origin->ds_dir)->dd_clones, 1229 dsobj, tx)); 1230 } 1231 } 1232 1233 /* handle encryption */ 1234 dsl_dataset_create_crypt_sync(dsobj, dd, origin, dcp, tx); 1235 1236 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE) 1237 dsphys->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 1238 1239 dmu_buf_rele(dbuf, FTAG); 1240 1241 dmu_buf_will_dirty(dd->dd_dbuf, tx); 1242 dsl_dir_phys(dd)->dd_head_dataset_obj = dsobj; 1243 1244 return (dsobj); 1245 } 1246 1247 static void 1248 dsl_dataset_zero_zil(dsl_dataset_t *ds, dmu_tx_t *tx) 1249 { 1250 objset_t *os; 1251 1252 VERIFY0(dmu_objset_from_ds(ds, &os)); 1253 if (bcmp(&os->os_zil_header, &zero_zil, sizeof (zero_zil)) != 0) { 1254 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1255 zio_t *zio; 1256 1257 bzero(&os->os_zil_header, sizeof (os->os_zil_header)); 1258 if (os->os_encrypted) 1259 os->os_next_write_raw[tx->tx_txg & TXG_MASK] = B_TRUE; 1260 1261 zio = zio_root(dp->dp_spa, NULL, NULL, ZIO_FLAG_MUSTSUCCEED); 1262 dsl_dataset_sync(ds, zio, tx); 1263 VERIFY0(zio_wait(zio)); 1264 1265 /* dsl_dataset_sync_done will drop this reference. */ 1266 dmu_buf_add_ref(ds->ds_dbuf, ds); 1267 dsl_dataset_sync_done(ds, tx); 1268 } 1269 } 1270 1271 uint64_t 1272 dsl_dataset_create_sync(dsl_dir_t *pdd, const char *lastname, 1273 dsl_dataset_t *origin, uint64_t flags, cred_t *cr, 1274 dsl_crypto_params_t *dcp, dmu_tx_t *tx) 1275 { 1276 dsl_pool_t *dp = pdd->dd_pool; 1277 uint64_t dsobj, ddobj; 1278 dsl_dir_t *dd; 1279 1280 ASSERT(dmu_tx_is_syncing(tx)); 1281 ASSERT(lastname[0] != '@'); 1282 /* 1283 * Filesystems will eventually have their origin set to dp_origin_snap, 1284 * but that's taken care of in dsl_dataset_create_sync_dd. When 1285 * creating a filesystem, this function is called with origin equal to 1286 * NULL. 1287 */ 1288 if (origin != NULL) 1289 ASSERT3P(origin, !=, dp->dp_origin_snap); 1290 1291 ddobj = dsl_dir_create_sync(dp, pdd, lastname, tx); 1292 VERIFY0(dsl_dir_hold_obj(dp, ddobj, lastname, FTAG, &dd)); 1293 1294 dsobj = dsl_dataset_create_sync_dd(dd, origin, dcp, 1295 flags & ~DS_CREATE_FLAG_NODIRTY, tx); 1296 1297 dsl_deleg_set_create_perms(dd, tx, cr); 1298 1299 /* 1300 * If we are creating a clone and the livelist feature is enabled, 1301 * add the entry DD_FIELD_LIVELIST to ZAP. 1302 */ 1303 if (origin != NULL && 1304 spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_LIVELIST)) { 1305 objset_t *mos = dd->dd_pool->dp_meta_objset; 1306 dsl_dir_zapify(dd, tx); 1307 uint64_t obj = dsl_deadlist_alloc(mos, tx); 1308 VERIFY0(zap_add(mos, dd->dd_object, DD_FIELD_LIVELIST, 1309 sizeof (uint64_t), 1, &obj, tx)); 1310 spa_feature_incr(dp->dp_spa, SPA_FEATURE_LIVELIST, tx); 1311 } 1312 1313 /* 1314 * Since we're creating a new node we know it's a leaf, so we can 1315 * initialize the counts if the limit feature is active. 1316 */ 1317 if (spa_feature_is_active(dp->dp_spa, SPA_FEATURE_FS_SS_LIMIT)) { 1318 uint64_t cnt = 0; 1319 objset_t *os = dd->dd_pool->dp_meta_objset; 1320 1321 dsl_dir_zapify(dd, tx); 1322 VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_FILESYSTEM_COUNT, 1323 sizeof (cnt), 1, &cnt, tx)); 1324 VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_SNAPSHOT_COUNT, 1325 sizeof (cnt), 1, &cnt, tx)); 1326 } 1327 1328 dsl_dir_rele(dd, FTAG); 1329 1330 /* 1331 * If we are creating a clone, make sure we zero out any stale 1332 * data from the origin snapshots zil header. 1333 */ 1334 if (origin != NULL && !(flags & DS_CREATE_FLAG_NODIRTY)) { 1335 dsl_dataset_t *ds; 1336 1337 VERIFY0(dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds)); 1338 dsl_dataset_zero_zil(ds, tx); 1339 dsl_dataset_rele(ds, FTAG); 1340 } 1341 1342 return (dsobj); 1343 } 1344 1345 /* 1346 * The unique space in the head dataset can be calculated by subtracting 1347 * the space used in the most recent snapshot, that is still being used 1348 * in this file system, from the space currently in use. To figure out 1349 * the space in the most recent snapshot still in use, we need to take 1350 * the total space used in the snapshot and subtract out the space that 1351 * has been freed up since the snapshot was taken. 1352 */ 1353 void 1354 dsl_dataset_recalc_head_uniq(dsl_dataset_t *ds) 1355 { 1356 uint64_t mrs_used; 1357 uint64_t dlused, dlcomp, dluncomp; 1358 1359 ASSERT(!ds->ds_is_snapshot); 1360 1361 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) 1362 mrs_used = dsl_dataset_phys(ds->ds_prev)->ds_referenced_bytes; 1363 else 1364 mrs_used = 0; 1365 1366 dsl_deadlist_space(&ds->ds_deadlist, &dlused, &dlcomp, &dluncomp); 1367 1368 ASSERT3U(dlused, <=, mrs_used); 1369 dsl_dataset_phys(ds)->ds_unique_bytes = 1370 dsl_dataset_phys(ds)->ds_referenced_bytes - (mrs_used - dlused); 1371 1372 if (spa_version(ds->ds_dir->dd_pool->dp_spa) >= 1373 SPA_VERSION_UNIQUE_ACCURATE) 1374 dsl_dataset_phys(ds)->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 1375 } 1376 1377 void 1378 dsl_dataset_remove_from_next_clones(dsl_dataset_t *ds, uint64_t obj, 1379 dmu_tx_t *tx) 1380 { 1381 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 1382 uint64_t count __maybe_unused; 1383 int err; 1384 1385 ASSERT(dsl_dataset_phys(ds)->ds_num_children >= 2); 1386 err = zap_remove_int(mos, dsl_dataset_phys(ds)->ds_next_clones_obj, 1387 obj, tx); 1388 /* 1389 * The err should not be ENOENT, but a bug in a previous version 1390 * of the code could cause upgrade_clones_cb() to not set 1391 * ds_next_snap_obj when it should, leading to a missing entry. 1392 * If we knew that the pool was created after 1393 * SPA_VERSION_NEXT_CLONES, we could assert that it isn't 1394 * ENOENT. However, at least we can check that we don't have 1395 * too many entries in the next_clones_obj even after failing to 1396 * remove this one. 1397 */ 1398 if (err != ENOENT) 1399 VERIFY0(err); 1400 ASSERT0(zap_count(mos, dsl_dataset_phys(ds)->ds_next_clones_obj, 1401 &count)); 1402 ASSERT3U(count, <=, dsl_dataset_phys(ds)->ds_num_children - 2); 1403 } 1404 1405 1406 blkptr_t * 1407 dsl_dataset_get_blkptr(dsl_dataset_t *ds) 1408 { 1409 return (&dsl_dataset_phys(ds)->ds_bp); 1410 } 1411 1412 spa_t * 1413 dsl_dataset_get_spa(dsl_dataset_t *ds) 1414 { 1415 return (ds->ds_dir->dd_pool->dp_spa); 1416 } 1417 1418 void 1419 dsl_dataset_dirty(dsl_dataset_t *ds, dmu_tx_t *tx) 1420 { 1421 dsl_pool_t *dp; 1422 1423 if (ds == NULL) /* this is the meta-objset */ 1424 return; 1425 1426 ASSERT(ds->ds_objset != NULL); 1427 1428 if (dsl_dataset_phys(ds)->ds_next_snap_obj != 0) 1429 panic("dirtying snapshot!"); 1430 1431 /* Must not dirty a dataset in the same txg where it got snapshotted. */ 1432 ASSERT3U(tx->tx_txg, >, dsl_dataset_phys(ds)->ds_prev_snap_txg); 1433 1434 dp = ds->ds_dir->dd_pool; 1435 if (txg_list_add(&dp->dp_dirty_datasets, ds, tx->tx_txg)) { 1436 objset_t *os = ds->ds_objset; 1437 1438 /* up the hold count until we can be written out */ 1439 dmu_buf_add_ref(ds->ds_dbuf, ds); 1440 1441 /* if this dataset is encrypted, grab a reference to the DCK */ 1442 if (ds->ds_dir->dd_crypto_obj != 0 && 1443 !os->os_raw_receive && 1444 !os->os_next_write_raw[tx->tx_txg & TXG_MASK]) { 1445 ASSERT3P(ds->ds_key_mapping, !=, NULL); 1446 key_mapping_add_ref(ds->ds_key_mapping, ds); 1447 } 1448 } 1449 } 1450 1451 static int 1452 dsl_dataset_snapshot_reserve_space(dsl_dataset_t *ds, dmu_tx_t *tx) 1453 { 1454 uint64_t asize; 1455 1456 if (!dmu_tx_is_syncing(tx)) 1457 return (0); 1458 1459 /* 1460 * If there's an fs-only reservation, any blocks that might become 1461 * owned by the snapshot dataset must be accommodated by space 1462 * outside of the reservation. 1463 */ 1464 ASSERT(ds->ds_reserved == 0 || DS_UNIQUE_IS_ACCURATE(ds)); 1465 asize = MIN(dsl_dataset_phys(ds)->ds_unique_bytes, ds->ds_reserved); 1466 if (asize > dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE)) 1467 return (SET_ERROR(ENOSPC)); 1468 1469 /* 1470 * Propagate any reserved space for this snapshot to other 1471 * snapshot checks in this sync group. 1472 */ 1473 if (asize > 0) 1474 dsl_dir_willuse_space(ds->ds_dir, asize, tx); 1475 1476 return (0); 1477 } 1478 1479 int 1480 dsl_dataset_snapshot_check_impl(dsl_dataset_t *ds, const char *snapname, 1481 dmu_tx_t *tx, boolean_t recv, uint64_t cnt, cred_t *cr, proc_t *proc) 1482 { 1483 int error; 1484 uint64_t value; 1485 1486 ds->ds_trysnap_txg = tx->tx_txg; 1487 1488 if (!dmu_tx_is_syncing(tx)) 1489 return (0); 1490 1491 /* 1492 * We don't allow multiple snapshots of the same txg. If there 1493 * is already one, try again. 1494 */ 1495 if (dsl_dataset_phys(ds)->ds_prev_snap_txg >= tx->tx_txg) 1496 return (SET_ERROR(EAGAIN)); 1497 1498 /* 1499 * Check for conflicting snapshot name. 1500 */ 1501 error = dsl_dataset_snap_lookup(ds, snapname, &value); 1502 if (error == 0) 1503 return (SET_ERROR(EEXIST)); 1504 if (error != ENOENT) 1505 return (error); 1506 1507 /* 1508 * We don't allow taking snapshots of inconsistent datasets, such as 1509 * those into which we are currently receiving. However, if we are 1510 * creating this snapshot as part of a receive, this check will be 1511 * executed atomically with respect to the completion of the receive 1512 * itself but prior to the clearing of DS_FLAG_INCONSISTENT; in this 1513 * case we ignore this, knowing it will be fixed up for us shortly in 1514 * dmu_recv_end_sync(). 1515 */ 1516 if (!recv && DS_IS_INCONSISTENT(ds)) 1517 return (SET_ERROR(EBUSY)); 1518 1519 /* 1520 * Skip the check for temporary snapshots or if we have already checked 1521 * the counts in dsl_dataset_snapshot_check. This means we really only 1522 * check the count here when we're receiving a stream. 1523 */ 1524 if (cnt != 0 && cr != NULL) { 1525 error = dsl_fs_ss_limit_check(ds->ds_dir, cnt, 1526 ZFS_PROP_SNAPSHOT_LIMIT, NULL, cr, proc); 1527 if (error != 0) 1528 return (error); 1529 } 1530 1531 error = dsl_dataset_snapshot_reserve_space(ds, tx); 1532 if (error != 0) 1533 return (error); 1534 1535 return (0); 1536 } 1537 1538 int 1539 dsl_dataset_snapshot_check(void *arg, dmu_tx_t *tx) 1540 { 1541 dsl_dataset_snapshot_arg_t *ddsa = arg; 1542 dsl_pool_t *dp = dmu_tx_pool(tx); 1543 nvpair_t *pair; 1544 int rv = 0; 1545 1546 /* 1547 * Pre-compute how many total new snapshots will be created for each 1548 * level in the tree and below. This is needed for validating the 1549 * snapshot limit when either taking a recursive snapshot or when 1550 * taking multiple snapshots. 1551 * 1552 * The problem is that the counts are not actually adjusted when 1553 * we are checking, only when we finally sync. For a single snapshot, 1554 * this is easy, the count will increase by 1 at each node up the tree, 1555 * but its more complicated for the recursive/multiple snapshot case. 1556 * 1557 * The dsl_fs_ss_limit_check function does recursively check the count 1558 * at each level up the tree but since it is validating each snapshot 1559 * independently we need to be sure that we are validating the complete 1560 * count for the entire set of snapshots. We do this by rolling up the 1561 * counts for each component of the name into an nvlist and then 1562 * checking each of those cases with the aggregated count. 1563 * 1564 * This approach properly handles not only the recursive snapshot 1565 * case (where we get all of those on the ddsa_snaps list) but also 1566 * the sibling case (e.g. snapshot a/b and a/c so that we will also 1567 * validate the limit on 'a' using a count of 2). 1568 * 1569 * We validate the snapshot names in the third loop and only report 1570 * name errors once. 1571 */ 1572 if (dmu_tx_is_syncing(tx)) { 1573 char *nm; 1574 nvlist_t *cnt_track = NULL; 1575 cnt_track = fnvlist_alloc(); 1576 1577 nm = kmem_alloc(MAXPATHLEN, KM_SLEEP); 1578 1579 /* Rollup aggregated counts into the cnt_track list */ 1580 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL); 1581 pair != NULL; 1582 pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) { 1583 char *pdelim; 1584 uint64_t val; 1585 1586 (void) strlcpy(nm, nvpair_name(pair), MAXPATHLEN); 1587 pdelim = strchr(nm, '@'); 1588 if (pdelim == NULL) 1589 continue; 1590 *pdelim = '\0'; 1591 1592 do { 1593 if (nvlist_lookup_uint64(cnt_track, nm, 1594 &val) == 0) { 1595 /* update existing entry */ 1596 fnvlist_add_uint64(cnt_track, nm, 1597 val + 1); 1598 } else { 1599 /* add to list */ 1600 fnvlist_add_uint64(cnt_track, nm, 1); 1601 } 1602 1603 pdelim = strrchr(nm, '/'); 1604 if (pdelim != NULL) 1605 *pdelim = '\0'; 1606 } while (pdelim != NULL); 1607 } 1608 1609 kmem_free(nm, MAXPATHLEN); 1610 1611 /* Check aggregated counts at each level */ 1612 for (pair = nvlist_next_nvpair(cnt_track, NULL); 1613 pair != NULL; pair = nvlist_next_nvpair(cnt_track, pair)) { 1614 int error = 0; 1615 char *name; 1616 uint64_t cnt = 0; 1617 dsl_dataset_t *ds; 1618 1619 name = nvpair_name(pair); 1620 cnt = fnvpair_value_uint64(pair); 1621 ASSERT(cnt > 0); 1622 1623 error = dsl_dataset_hold(dp, name, FTAG, &ds); 1624 if (error == 0) { 1625 error = dsl_fs_ss_limit_check(ds->ds_dir, cnt, 1626 ZFS_PROP_SNAPSHOT_LIMIT, NULL, 1627 ddsa->ddsa_cr, ddsa->ddsa_proc); 1628 dsl_dataset_rele(ds, FTAG); 1629 } 1630 1631 if (error != 0) { 1632 if (ddsa->ddsa_errors != NULL) 1633 fnvlist_add_int32(ddsa->ddsa_errors, 1634 name, error); 1635 rv = error; 1636 /* only report one error for this check */ 1637 break; 1638 } 1639 } 1640 nvlist_free(cnt_track); 1641 } 1642 1643 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL); 1644 pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) { 1645 int error = 0; 1646 dsl_dataset_t *ds; 1647 char *name, *atp = NULL; 1648 char dsname[ZFS_MAX_DATASET_NAME_LEN]; 1649 1650 name = nvpair_name(pair); 1651 if (strlen(name) >= ZFS_MAX_DATASET_NAME_LEN) 1652 error = SET_ERROR(ENAMETOOLONG); 1653 if (error == 0) { 1654 atp = strchr(name, '@'); 1655 if (atp == NULL) 1656 error = SET_ERROR(EINVAL); 1657 if (error == 0) 1658 (void) strlcpy(dsname, name, atp - name + 1); 1659 } 1660 if (error == 0) 1661 error = dsl_dataset_hold(dp, dsname, FTAG, &ds); 1662 if (error == 0) { 1663 /* passing 0/NULL skips dsl_fs_ss_limit_check */ 1664 error = dsl_dataset_snapshot_check_impl(ds, 1665 atp + 1, tx, B_FALSE, 0, NULL, NULL); 1666 dsl_dataset_rele(ds, FTAG); 1667 } 1668 1669 if (error != 0) { 1670 if (ddsa->ddsa_errors != NULL) { 1671 fnvlist_add_int32(ddsa->ddsa_errors, 1672 name, error); 1673 } 1674 rv = error; 1675 } 1676 } 1677 1678 return (rv); 1679 } 1680 1681 void 1682 dsl_dataset_snapshot_sync_impl(dsl_dataset_t *ds, const char *snapname, 1683 dmu_tx_t *tx) 1684 { 1685 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1686 dmu_buf_t *dbuf; 1687 dsl_dataset_phys_t *dsphys; 1688 uint64_t dsobj, crtxg; 1689 objset_t *mos = dp->dp_meta_objset; 1690 static zil_header_t zero_zil __maybe_unused; 1691 objset_t *os __maybe_unused; 1692 1693 ASSERT(RRW_WRITE_HELD(&dp->dp_config_rwlock)); 1694 1695 /* 1696 * If we are on an old pool, the zil must not be active, in which 1697 * case it will be zeroed. Usually zil_suspend() accomplishes this. 1698 */ 1699 ASSERT(spa_version(dmu_tx_pool(tx)->dp_spa) >= SPA_VERSION_FAST_SNAP || 1700 dmu_objset_from_ds(ds, &os) != 0 || 1701 bcmp(&os->os_phys->os_zil_header, &zero_zil, 1702 sizeof (zero_zil)) == 0); 1703 1704 /* Should not snapshot a dirty dataset. */ 1705 ASSERT(!txg_list_member(&ds->ds_dir->dd_pool->dp_dirty_datasets, 1706 ds, tx->tx_txg)); 1707 1708 dsl_fs_ss_count_adjust(ds->ds_dir, 1, DD_FIELD_SNAPSHOT_COUNT, tx); 1709 1710 /* 1711 * The origin's ds_creation_txg has to be < TXG_INITIAL 1712 */ 1713 if (strcmp(snapname, ORIGIN_DIR_NAME) == 0) 1714 crtxg = 1; 1715 else 1716 crtxg = tx->tx_txg; 1717 1718 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, 1719 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); 1720 VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); 1721 dmu_buf_will_dirty(dbuf, tx); 1722 dsphys = dbuf->db_data; 1723 bzero(dsphys, sizeof (dsl_dataset_phys_t)); 1724 dsphys->ds_dir_obj = ds->ds_dir->dd_object; 1725 dsphys->ds_fsid_guid = unique_create(); 1726 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, 1727 sizeof (dsphys->ds_guid)); 1728 dsphys->ds_prev_snap_obj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 1729 dsphys->ds_prev_snap_txg = dsl_dataset_phys(ds)->ds_prev_snap_txg; 1730 dsphys->ds_next_snap_obj = ds->ds_object; 1731 dsphys->ds_num_children = 1; 1732 dsphys->ds_creation_time = gethrestime_sec(); 1733 dsphys->ds_creation_txg = crtxg; 1734 dsphys->ds_deadlist_obj = dsl_dataset_phys(ds)->ds_deadlist_obj; 1735 dsphys->ds_referenced_bytes = dsl_dataset_phys(ds)->ds_referenced_bytes; 1736 dsphys->ds_compressed_bytes = dsl_dataset_phys(ds)->ds_compressed_bytes; 1737 dsphys->ds_uncompressed_bytes = 1738 dsl_dataset_phys(ds)->ds_uncompressed_bytes; 1739 dsphys->ds_flags = dsl_dataset_phys(ds)->ds_flags; 1740 rrw_enter(&ds->ds_bp_rwlock, RW_READER, FTAG); 1741 dsphys->ds_bp = dsl_dataset_phys(ds)->ds_bp; 1742 rrw_exit(&ds->ds_bp_rwlock, FTAG); 1743 dmu_buf_rele(dbuf, FTAG); 1744 1745 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 1746 if (zfeature_active(f, ds->ds_feature[f])) { 1747 dsl_dataset_activate_feature(dsobj, f, 1748 ds->ds_feature[f], tx); 1749 } 1750 } 1751 1752 ASSERT3U(ds->ds_prev != 0, ==, 1753 dsl_dataset_phys(ds)->ds_prev_snap_obj != 0); 1754 if (ds->ds_prev) { 1755 uint64_t next_clones_obj = 1756 dsl_dataset_phys(ds->ds_prev)->ds_next_clones_obj; 1757 ASSERT(dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj == 1758 ds->ds_object || 1759 dsl_dataset_phys(ds->ds_prev)->ds_num_children > 1); 1760 if (dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj == 1761 ds->ds_object) { 1762 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); 1763 ASSERT3U(dsl_dataset_phys(ds)->ds_prev_snap_txg, ==, 1764 dsl_dataset_phys(ds->ds_prev)->ds_creation_txg); 1765 dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj = dsobj; 1766 } else if (next_clones_obj != 0) { 1767 dsl_dataset_remove_from_next_clones(ds->ds_prev, 1768 dsphys->ds_next_snap_obj, tx); 1769 VERIFY0(zap_add_int(mos, 1770 next_clones_obj, dsobj, tx)); 1771 } 1772 } 1773 1774 /* 1775 * If we have a reference-reservation on this dataset, we will 1776 * need to increase the amount of refreservation being charged 1777 * since our unique space is going to zero. 1778 */ 1779 if (ds->ds_reserved) { 1780 int64_t delta; 1781 ASSERT(DS_UNIQUE_IS_ACCURATE(ds)); 1782 delta = MIN(dsl_dataset_phys(ds)->ds_unique_bytes, 1783 ds->ds_reserved); 1784 dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV, 1785 delta, 0, 0, tx); 1786 } 1787 1788 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1789 dsl_dataset_phys(ds)->ds_deadlist_obj = 1790 dsl_deadlist_clone(&ds->ds_deadlist, UINT64_MAX, 1791 dsl_dataset_phys(ds)->ds_prev_snap_obj, tx); 1792 dsl_deadlist_close(&ds->ds_deadlist); 1793 dsl_deadlist_open(&ds->ds_deadlist, mos, 1794 dsl_dataset_phys(ds)->ds_deadlist_obj); 1795 dsl_deadlist_add_key(&ds->ds_deadlist, 1796 dsl_dataset_phys(ds)->ds_prev_snap_txg, tx); 1797 dsl_bookmark_snapshotted(ds, tx); 1798 1799 if (dsl_dataset_remap_deadlist_exists(ds)) { 1800 uint64_t remap_deadlist_obj = 1801 dsl_dataset_get_remap_deadlist_object(ds); 1802 /* 1803 * Move the remap_deadlist to the snapshot. The head 1804 * will create a new remap deadlist on demand, from 1805 * dsl_dataset_block_remapped(). 1806 */ 1807 dsl_dataset_unset_remap_deadlist_object(ds, tx); 1808 dsl_deadlist_close(&ds->ds_remap_deadlist); 1809 1810 dmu_object_zapify(mos, dsobj, DMU_OT_DSL_DATASET, tx); 1811 VERIFY0(zap_add(mos, dsobj, DS_FIELD_REMAP_DEADLIST, 1812 sizeof (remap_deadlist_obj), 1, &remap_deadlist_obj, tx)); 1813 } 1814 1815 /* 1816 * Create a ivset guid for this snapshot if the dataset is 1817 * encrypted. This may be overridden by a raw receive. A 1818 * previous implementation of this code did not have this 1819 * field as part of the on-disk format for ZFS encryption 1820 * (see errata #4). As part of the remediation for this 1821 * issue, we ask the user to enable the bookmark_v2 feature 1822 * which is now a dependency of the encryption feature. We 1823 * use this as a heuristic to determine when the user has 1824 * elected to correct any datasets created with the old code. 1825 * As a result, we only do this step if the bookmark_v2 1826 * feature is enabled, which limits the number of states a 1827 * given pool / dataset can be in with regards to terms of 1828 * correcting the issue. 1829 */ 1830 if (ds->ds_dir->dd_crypto_obj != 0 && 1831 spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_BOOKMARK_V2)) { 1832 uint64_t ivset_guid = unique_create(); 1833 1834 dmu_object_zapify(mos, dsobj, DMU_OT_DSL_DATASET, tx); 1835 VERIFY0(zap_add(mos, dsobj, DS_FIELD_IVSET_GUID, 1836 sizeof (ivset_guid), 1, &ivset_guid, tx)); 1837 } 1838 1839 ASSERT3U(dsl_dataset_phys(ds)->ds_prev_snap_txg, <, tx->tx_txg); 1840 dsl_dataset_phys(ds)->ds_prev_snap_obj = dsobj; 1841 dsl_dataset_phys(ds)->ds_prev_snap_txg = crtxg; 1842 dsl_dataset_phys(ds)->ds_unique_bytes = 0; 1843 1844 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE) 1845 dsl_dataset_phys(ds)->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 1846 1847 VERIFY0(zap_add(mos, dsl_dataset_phys(ds)->ds_snapnames_zapobj, 1848 snapname, 8, 1, &dsobj, tx)); 1849 1850 if (ds->ds_prev) 1851 dsl_dataset_rele(ds->ds_prev, ds); 1852 VERIFY0(dsl_dataset_hold_obj(dp, 1853 dsl_dataset_phys(ds)->ds_prev_snap_obj, ds, &ds->ds_prev)); 1854 1855 dsl_scan_ds_snapshotted(ds, tx); 1856 1857 dsl_dir_snap_cmtime_update(ds->ds_dir); 1858 1859 spa_history_log_internal_ds(ds->ds_prev, "snapshot", tx, " "); 1860 } 1861 1862 void 1863 dsl_dataset_snapshot_sync(void *arg, dmu_tx_t *tx) 1864 { 1865 dsl_dataset_snapshot_arg_t *ddsa = arg; 1866 dsl_pool_t *dp = dmu_tx_pool(tx); 1867 nvpair_t *pair; 1868 1869 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL); 1870 pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) { 1871 dsl_dataset_t *ds; 1872 char *name, *atp; 1873 char dsname[ZFS_MAX_DATASET_NAME_LEN]; 1874 1875 name = nvpair_name(pair); 1876 atp = strchr(name, '@'); 1877 (void) strlcpy(dsname, name, atp - name + 1); 1878 VERIFY0(dsl_dataset_hold(dp, dsname, FTAG, &ds)); 1879 1880 dsl_dataset_snapshot_sync_impl(ds, atp + 1, tx); 1881 if (ddsa->ddsa_props != NULL) { 1882 dsl_props_set_sync_impl(ds->ds_prev, 1883 ZPROP_SRC_LOCAL, ddsa->ddsa_props, tx); 1884 } 1885 dsl_dataset_rele(ds, FTAG); 1886 } 1887 } 1888 1889 /* 1890 * The snapshots must all be in the same pool. 1891 * All-or-nothing: if there are any failures, nothing will be modified. 1892 */ 1893 int 1894 dsl_dataset_snapshot(nvlist_t *snaps, nvlist_t *props, nvlist_t *errors) 1895 { 1896 dsl_dataset_snapshot_arg_t ddsa; 1897 nvpair_t *pair; 1898 boolean_t needsuspend; 1899 int error; 1900 spa_t *spa; 1901 char *firstname; 1902 nvlist_t *suspended = NULL; 1903 1904 pair = nvlist_next_nvpair(snaps, NULL); 1905 if (pair == NULL) 1906 return (0); 1907 firstname = nvpair_name(pair); 1908 1909 error = spa_open(firstname, &spa, FTAG); 1910 if (error != 0) 1911 return (error); 1912 needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP); 1913 spa_close(spa, FTAG); 1914 1915 if (needsuspend) { 1916 suspended = fnvlist_alloc(); 1917 for (pair = nvlist_next_nvpair(snaps, NULL); pair != NULL; 1918 pair = nvlist_next_nvpair(snaps, pair)) { 1919 char fsname[ZFS_MAX_DATASET_NAME_LEN]; 1920 char *snapname = nvpair_name(pair); 1921 char *atp; 1922 void *cookie; 1923 1924 atp = strchr(snapname, '@'); 1925 if (atp == NULL) { 1926 error = SET_ERROR(EINVAL); 1927 break; 1928 } 1929 (void) strlcpy(fsname, snapname, atp - snapname + 1); 1930 1931 error = zil_suspend(fsname, &cookie); 1932 if (error != 0) 1933 break; 1934 fnvlist_add_uint64(suspended, fsname, 1935 (uintptr_t)cookie); 1936 } 1937 } 1938 1939 ddsa.ddsa_snaps = snaps; 1940 ddsa.ddsa_props = props; 1941 ddsa.ddsa_errors = errors; 1942 ddsa.ddsa_cr = CRED(); 1943 ddsa.ddsa_proc = curproc; 1944 1945 if (error == 0) { 1946 error = dsl_sync_task(firstname, dsl_dataset_snapshot_check, 1947 dsl_dataset_snapshot_sync, &ddsa, 1948 fnvlist_num_pairs(snaps) * 3, ZFS_SPACE_CHECK_NORMAL); 1949 } 1950 1951 if (suspended != NULL) { 1952 for (pair = nvlist_next_nvpair(suspended, NULL); pair != NULL; 1953 pair = nvlist_next_nvpair(suspended, pair)) { 1954 zil_resume((void *)(uintptr_t) 1955 fnvpair_value_uint64(pair)); 1956 } 1957 fnvlist_free(suspended); 1958 } 1959 1960 if (error == 0) { 1961 for (pair = nvlist_next_nvpair(snaps, NULL); pair != NULL; 1962 pair = nvlist_next_nvpair(snaps, pair)) { 1963 zvol_create_minor(nvpair_name(pair)); 1964 } 1965 } 1966 1967 return (error); 1968 } 1969 1970 typedef struct dsl_dataset_snapshot_tmp_arg { 1971 const char *ddsta_fsname; 1972 const char *ddsta_snapname; 1973 minor_t ddsta_cleanup_minor; 1974 const char *ddsta_htag; 1975 } dsl_dataset_snapshot_tmp_arg_t; 1976 1977 static int 1978 dsl_dataset_snapshot_tmp_check(void *arg, dmu_tx_t *tx) 1979 { 1980 dsl_dataset_snapshot_tmp_arg_t *ddsta = arg; 1981 dsl_pool_t *dp = dmu_tx_pool(tx); 1982 dsl_dataset_t *ds; 1983 int error; 1984 1985 error = dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds); 1986 if (error != 0) 1987 return (error); 1988 1989 /* NULL cred means no limit check for tmp snapshot */ 1990 error = dsl_dataset_snapshot_check_impl(ds, ddsta->ddsta_snapname, 1991 tx, B_FALSE, 0, NULL, NULL); 1992 if (error != 0) { 1993 dsl_dataset_rele(ds, FTAG); 1994 return (error); 1995 } 1996 1997 if (spa_version(dp->dp_spa) < SPA_VERSION_USERREFS) { 1998 dsl_dataset_rele(ds, FTAG); 1999 return (SET_ERROR(ENOTSUP)); 2000 } 2001 error = dsl_dataset_user_hold_check_one(NULL, ddsta->ddsta_htag, 2002 B_TRUE, tx); 2003 if (error != 0) { 2004 dsl_dataset_rele(ds, FTAG); 2005 return (error); 2006 } 2007 2008 dsl_dataset_rele(ds, FTAG); 2009 return (0); 2010 } 2011 2012 static void 2013 dsl_dataset_snapshot_tmp_sync(void *arg, dmu_tx_t *tx) 2014 { 2015 dsl_dataset_snapshot_tmp_arg_t *ddsta = arg; 2016 dsl_pool_t *dp = dmu_tx_pool(tx); 2017 dsl_dataset_t *ds = NULL; 2018 2019 VERIFY0(dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds)); 2020 2021 dsl_dataset_snapshot_sync_impl(ds, ddsta->ddsta_snapname, tx); 2022 dsl_dataset_user_hold_sync_one(ds->ds_prev, ddsta->ddsta_htag, 2023 ddsta->ddsta_cleanup_minor, gethrestime_sec(), tx); 2024 dsl_destroy_snapshot_sync_impl(ds->ds_prev, B_TRUE, tx); 2025 2026 dsl_dataset_rele(ds, FTAG); 2027 } 2028 2029 int 2030 dsl_dataset_snapshot_tmp(const char *fsname, const char *snapname, 2031 minor_t cleanup_minor, const char *htag) 2032 { 2033 dsl_dataset_snapshot_tmp_arg_t ddsta; 2034 int error; 2035 spa_t *spa; 2036 boolean_t needsuspend; 2037 void *cookie; 2038 2039 ddsta.ddsta_fsname = fsname; 2040 ddsta.ddsta_snapname = snapname; 2041 ddsta.ddsta_cleanup_minor = cleanup_minor; 2042 ddsta.ddsta_htag = htag; 2043 2044 error = spa_open(fsname, &spa, FTAG); 2045 if (error != 0) 2046 return (error); 2047 needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP); 2048 spa_close(spa, FTAG); 2049 2050 if (needsuspend) { 2051 error = zil_suspend(fsname, &cookie); 2052 if (error != 0) 2053 return (error); 2054 } 2055 2056 error = dsl_sync_task(fsname, dsl_dataset_snapshot_tmp_check, 2057 dsl_dataset_snapshot_tmp_sync, &ddsta, 3, ZFS_SPACE_CHECK_RESERVED); 2058 2059 if (needsuspend) 2060 zil_resume(cookie); 2061 return (error); 2062 } 2063 2064 void 2065 dsl_dataset_sync(dsl_dataset_t *ds, zio_t *zio, dmu_tx_t *tx) 2066 { 2067 ASSERT(dmu_tx_is_syncing(tx)); 2068 ASSERT(ds->ds_objset != NULL); 2069 ASSERT(dsl_dataset_phys(ds)->ds_next_snap_obj == 0); 2070 2071 /* 2072 * in case we had to change ds_fsid_guid when we opened it, 2073 * sync it out now. 2074 */ 2075 dmu_buf_will_dirty(ds->ds_dbuf, tx); 2076 dsl_dataset_phys(ds)->ds_fsid_guid = ds->ds_fsid_guid; 2077 2078 if (ds->ds_resume_bytes[tx->tx_txg & TXG_MASK] != 0) { 2079 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset, 2080 ds->ds_object, DS_FIELD_RESUME_OBJECT, 8, 1, 2081 &ds->ds_resume_object[tx->tx_txg & TXG_MASK], tx)); 2082 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset, 2083 ds->ds_object, DS_FIELD_RESUME_OFFSET, 8, 1, 2084 &ds->ds_resume_offset[tx->tx_txg & TXG_MASK], tx)); 2085 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset, 2086 ds->ds_object, DS_FIELD_RESUME_BYTES, 8, 1, 2087 &ds->ds_resume_bytes[tx->tx_txg & TXG_MASK], tx)); 2088 ds->ds_resume_object[tx->tx_txg & TXG_MASK] = 0; 2089 ds->ds_resume_offset[tx->tx_txg & TXG_MASK] = 0; 2090 ds->ds_resume_bytes[tx->tx_txg & TXG_MASK] = 0; 2091 } 2092 2093 dmu_objset_sync(ds->ds_objset, zio, tx); 2094 2095 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 2096 if (zfeature_active(f, ds->ds_feature_activation[f])) { 2097 if (zfeature_active(f, ds->ds_feature[f])) 2098 continue; 2099 dsl_dataset_activate_feature(ds->ds_object, f, 2100 ds->ds_feature_activation[f], tx); 2101 ds->ds_feature[f] = ds->ds_feature_activation[f]; 2102 } 2103 } 2104 } 2105 2106 /* 2107 * Check if the percentage of blocks shared between the clone and the 2108 * snapshot (as opposed to those that are clone only) is below a certain 2109 * threshold 2110 */ 2111 static boolean_t 2112 dsl_livelist_should_disable(dsl_dataset_t *ds) 2113 { 2114 uint64_t used, referenced; 2115 int percent_shared; 2116 2117 used = dsl_dir_get_usedds(ds->ds_dir); 2118 referenced = dsl_get_referenced(ds); 2119 ASSERT3U(referenced, >=, 0); 2120 ASSERT3U(used, >=, 0); 2121 if (referenced == 0) 2122 return (B_FALSE); 2123 percent_shared = (100 * (referenced - used)) / referenced; 2124 if (percent_shared <= zfs_livelist_min_percent_shared) 2125 return (B_TRUE); 2126 return (B_FALSE); 2127 } 2128 2129 /* 2130 * Check if it is possible to combine two livelist entries into one. 2131 * This is the case if the combined number of 'live' blkptrs (ALLOCs that 2132 * don't have a matching FREE) is under the maximum sublist size. 2133 * We check this by subtracting twice the total number of frees from the total 2134 * number of blkptrs. FREEs are counted twice because each FREE blkptr 2135 * will cancel out an ALLOC blkptr when the livelist is processed. 2136 */ 2137 static boolean_t 2138 dsl_livelist_should_condense(dsl_deadlist_entry_t *first, 2139 dsl_deadlist_entry_t *next) 2140 { 2141 uint64_t total_free = first->dle_bpobj.bpo_phys->bpo_num_freed + 2142 next->dle_bpobj.bpo_phys->bpo_num_freed; 2143 uint64_t total_entries = first->dle_bpobj.bpo_phys->bpo_num_blkptrs + 2144 next->dle_bpobj.bpo_phys->bpo_num_blkptrs; 2145 if ((total_entries - (2 * total_free)) < zfs_livelist_max_entries) 2146 return (B_TRUE); 2147 return (B_FALSE); 2148 } 2149 2150 typedef struct try_condense_arg { 2151 spa_t *spa; 2152 dsl_dataset_t *ds; 2153 } try_condense_arg_t; 2154 2155 /* 2156 * Iterate over the livelist entries, searching for a pair to condense. 2157 * A nonzero return value means stop, 0 means keep looking. 2158 */ 2159 static int 2160 dsl_livelist_try_condense(void *arg, dsl_deadlist_entry_t *first) 2161 { 2162 try_condense_arg_t *tca = arg; 2163 spa_t *spa = tca->spa; 2164 dsl_dataset_t *ds = tca->ds; 2165 dsl_deadlist_t *ll = &ds->ds_dir->dd_livelist; 2166 dsl_deadlist_entry_t *next; 2167 2168 /* The condense thread has not yet been created at import */ 2169 if (spa->spa_livelist_condense_zthr == NULL) 2170 return (1); 2171 2172 /* A condense is already in progress */ 2173 if (spa->spa_to_condense.ds != NULL) 2174 return (1); 2175 2176 next = AVL_NEXT(&ll->dl_tree, &first->dle_node); 2177 /* The livelist has only one entry - don't condense it */ 2178 if (next == NULL) 2179 return (1); 2180 2181 /* Next is the newest entry - don't condense it */ 2182 if (AVL_NEXT(&ll->dl_tree, &next->dle_node) == NULL) 2183 return (1); 2184 2185 /* This pair is not ready to condense but keep looking */ 2186 if (!dsl_livelist_should_condense(first, next)) 2187 return (0); 2188 2189 /* 2190 * Add a ref to prevent the dataset from being evicted while 2191 * the condense zthr or synctask are running. Ref will be 2192 * released at the end of the condense synctask 2193 */ 2194 dmu_buf_add_ref(ds->ds_dbuf, spa); 2195 2196 spa->spa_to_condense.ds = ds; 2197 spa->spa_to_condense.first = first; 2198 spa->spa_to_condense.next = next; 2199 spa->spa_to_condense.syncing = B_FALSE; 2200 spa->spa_to_condense.cancelled = B_FALSE; 2201 2202 zthr_wakeup(spa->spa_livelist_condense_zthr); 2203 return (1); 2204 } 2205 2206 static void 2207 dsl_flush_pending_livelist(dsl_dataset_t *ds, dmu_tx_t *tx) 2208 { 2209 dsl_dir_t *dd = ds->ds_dir; 2210 spa_t *spa = ds->ds_dir->dd_pool->dp_spa; 2211 dsl_deadlist_entry_t *last = dsl_deadlist_last(&dd->dd_livelist); 2212 2213 /* Check if we need to add a new sub-livelist */ 2214 if (last == NULL) { 2215 /* The livelist is empty */ 2216 dsl_deadlist_add_key(&dd->dd_livelist, 2217 tx->tx_txg - 1, tx); 2218 } else if (spa_sync_pass(spa) == 1) { 2219 /* 2220 * Check if the newest entry is full. If it is, make a new one. 2221 * We only do this once per sync because we could overfill a 2222 * sublist in one sync pass and don't want to add another entry 2223 * for a txg that is already represented. This ensures that 2224 * blkptrs born in the same txg are stored in the same sublist. 2225 */ 2226 bpobj_t bpobj = last->dle_bpobj; 2227 uint64_t all = bpobj.bpo_phys->bpo_num_blkptrs; 2228 uint64_t free = bpobj.bpo_phys->bpo_num_freed; 2229 uint64_t alloc = all - free; 2230 if (alloc > zfs_livelist_max_entries) { 2231 dsl_deadlist_add_key(&dd->dd_livelist, 2232 tx->tx_txg - 1, tx); 2233 } 2234 } 2235 2236 /* Insert each entry into the on-disk livelist */ 2237 bplist_iterate(&dd->dd_pending_allocs, 2238 dsl_deadlist_insert_alloc_cb, &dd->dd_livelist, tx); 2239 bplist_iterate(&dd->dd_pending_frees, 2240 dsl_deadlist_insert_free_cb, &dd->dd_livelist, tx); 2241 2242 /* Attempt to condense every pair of adjacent entries */ 2243 try_condense_arg_t arg = { 2244 .spa = spa, 2245 .ds = ds 2246 }; 2247 dsl_deadlist_iterate(&dd->dd_livelist, dsl_livelist_try_condense, 2248 &arg); 2249 } 2250 2251 void 2252 dsl_dataset_sync_done(dsl_dataset_t *ds, dmu_tx_t *tx) 2253 { 2254 objset_t *os = ds->ds_objset; 2255 2256 bplist_iterate(&ds->ds_pending_deadlist, 2257 dsl_deadlist_insert_alloc_cb, &ds->ds_deadlist, tx); 2258 2259 if (dsl_deadlist_is_open(&ds->ds_dir->dd_livelist)) { 2260 dsl_flush_pending_livelist(ds, tx); 2261 if (dsl_livelist_should_disable(ds)) { 2262 dsl_dir_remove_livelist(ds->ds_dir, tx, B_TRUE); 2263 } 2264 } 2265 2266 dsl_bookmark_sync_done(ds, tx); 2267 2268 multilist_destroy(&os->os_synced_dnodes); 2269 2270 if (os->os_encrypted) 2271 os->os_next_write_raw[tx->tx_txg & TXG_MASK] = B_FALSE; 2272 else 2273 ASSERT0(os->os_next_write_raw[tx->tx_txg & TXG_MASK]); 2274 2275 ASSERT(!dmu_objset_is_dirty(os, dmu_tx_get_txg(tx))); 2276 2277 dmu_buf_rele(ds->ds_dbuf, ds); 2278 } 2279 2280 int 2281 get_clones_stat_impl(dsl_dataset_t *ds, nvlist_t *val) 2282 { 2283 uint64_t count = 0; 2284 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 2285 zap_cursor_t zc; 2286 zap_attribute_t za; 2287 2288 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool)); 2289 2290 /* 2291 * There may be missing entries in ds_next_clones_obj 2292 * due to a bug in a previous version of the code. 2293 * Only trust it if it has the right number of entries. 2294 */ 2295 if (dsl_dataset_phys(ds)->ds_next_clones_obj != 0) { 2296 VERIFY0(zap_count(mos, dsl_dataset_phys(ds)->ds_next_clones_obj, 2297 &count)); 2298 } 2299 if (count != dsl_dataset_phys(ds)->ds_num_children - 1) { 2300 return (SET_ERROR(ENOENT)); 2301 } 2302 for (zap_cursor_init(&zc, mos, 2303 dsl_dataset_phys(ds)->ds_next_clones_obj); 2304 zap_cursor_retrieve(&zc, &za) == 0; 2305 zap_cursor_advance(&zc)) { 2306 dsl_dataset_t *clone; 2307 char buf[ZFS_MAX_DATASET_NAME_LEN]; 2308 VERIFY0(dsl_dataset_hold_obj(ds->ds_dir->dd_pool, 2309 za.za_first_integer, FTAG, &clone)); 2310 dsl_dir_name(clone->ds_dir, buf); 2311 fnvlist_add_boolean(val, buf); 2312 dsl_dataset_rele(clone, FTAG); 2313 } 2314 zap_cursor_fini(&zc); 2315 return (0); 2316 } 2317 2318 void 2319 get_clones_stat(dsl_dataset_t *ds, nvlist_t *nv) 2320 { 2321 nvlist_t *propval = fnvlist_alloc(); 2322 nvlist_t *val = fnvlist_alloc(); 2323 2324 if (get_clones_stat_impl(ds, val) == 0) { 2325 fnvlist_add_nvlist(propval, ZPROP_VALUE, val); 2326 fnvlist_add_nvlist(nv, zfs_prop_to_name(ZFS_PROP_CLONES), 2327 propval); 2328 } 2329 2330 nvlist_free(val); 2331 nvlist_free(propval); 2332 } 2333 2334 /* 2335 * Returns a string that represents the receive resume stats token. It should 2336 * be freed with strfree(). 2337 */ 2338 char * 2339 get_receive_resume_stats_impl(dsl_dataset_t *ds) 2340 { 2341 dsl_pool_t *dp = ds->ds_dir->dd_pool; 2342 2343 if (dsl_dataset_has_resume_receive_state(ds)) { 2344 char *str; 2345 void *packed; 2346 uint8_t *compressed; 2347 uint64_t val; 2348 nvlist_t *token_nv = fnvlist_alloc(); 2349 size_t packed_size, compressed_size; 2350 2351 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 2352 DS_FIELD_RESUME_FROMGUID, sizeof (val), 1, &val) == 0) { 2353 fnvlist_add_uint64(token_nv, "fromguid", val); 2354 } 2355 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 2356 DS_FIELD_RESUME_OBJECT, sizeof (val), 1, &val) == 0) { 2357 fnvlist_add_uint64(token_nv, "object", val); 2358 } 2359 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 2360 DS_FIELD_RESUME_OFFSET, sizeof (val), 1, &val) == 0) { 2361 fnvlist_add_uint64(token_nv, "offset", val); 2362 } 2363 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 2364 DS_FIELD_RESUME_BYTES, sizeof (val), 1, &val) == 0) { 2365 fnvlist_add_uint64(token_nv, "bytes", val); 2366 } 2367 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 2368 DS_FIELD_RESUME_TOGUID, sizeof (val), 1, &val) == 0) { 2369 fnvlist_add_uint64(token_nv, "toguid", val); 2370 } 2371 char buf[MAXNAMELEN]; 2372 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 2373 DS_FIELD_RESUME_TONAME, 1, sizeof (buf), buf) == 0) { 2374 fnvlist_add_string(token_nv, "toname", buf); 2375 } 2376 if (zap_contains(dp->dp_meta_objset, ds->ds_object, 2377 DS_FIELD_RESUME_LARGEBLOCK) == 0) { 2378 fnvlist_add_boolean(token_nv, "largeblockok"); 2379 } 2380 if (zap_contains(dp->dp_meta_objset, ds->ds_object, 2381 DS_FIELD_RESUME_EMBEDOK) == 0) { 2382 fnvlist_add_boolean(token_nv, "embedok"); 2383 } 2384 if (zap_contains(dp->dp_meta_objset, ds->ds_object, 2385 DS_FIELD_RESUME_COMPRESSOK) == 0) { 2386 fnvlist_add_boolean(token_nv, "compressok"); 2387 } 2388 if (zap_contains(dp->dp_meta_objset, ds->ds_object, 2389 DS_FIELD_RESUME_RAWOK) == 0) { 2390 fnvlist_add_boolean(token_nv, "rawok"); 2391 } 2392 if (dsl_dataset_feature_is_active(ds, 2393 SPA_FEATURE_REDACTED_DATASETS)) { 2394 uint64_t num_redact_snaps; 2395 uint64_t *redact_snaps; 2396 VERIFY(dsl_dataset_get_uint64_array_feature(ds, 2397 SPA_FEATURE_REDACTED_DATASETS, &num_redact_snaps, 2398 &redact_snaps)); 2399 fnvlist_add_uint64_array(token_nv, "redact_snaps", 2400 redact_snaps, num_redact_snaps); 2401 } 2402 if (zap_contains(dp->dp_meta_objset, ds->ds_object, 2403 DS_FIELD_RESUME_REDACT_BOOKMARK_SNAPS) == 0) { 2404 uint64_t num_redact_snaps, int_size; 2405 uint64_t *redact_snaps; 2406 VERIFY0(zap_length(dp->dp_meta_objset, ds->ds_object, 2407 DS_FIELD_RESUME_REDACT_BOOKMARK_SNAPS, &int_size, 2408 &num_redact_snaps)); 2409 ASSERT3U(int_size, ==, sizeof (uint64_t)); 2410 2411 redact_snaps = kmem_alloc(int_size * num_redact_snaps, 2412 KM_SLEEP); 2413 VERIFY0(zap_lookup(dp->dp_meta_objset, ds->ds_object, 2414 DS_FIELD_RESUME_REDACT_BOOKMARK_SNAPS, int_size, 2415 num_redact_snaps, redact_snaps)); 2416 fnvlist_add_uint64_array(token_nv, "book_redact_snaps", 2417 redact_snaps, num_redact_snaps); 2418 kmem_free(redact_snaps, int_size * num_redact_snaps); 2419 } 2420 packed = fnvlist_pack(token_nv, &packed_size); 2421 fnvlist_free(token_nv); 2422 compressed = kmem_alloc(packed_size, KM_SLEEP); 2423 2424 compressed_size = gzip_compress(packed, compressed, 2425 packed_size, packed_size, 6); 2426 2427 zio_cksum_t cksum; 2428 fletcher_4_native_varsize(compressed, compressed_size, &cksum); 2429 2430 size_t alloc_size = compressed_size * 2 + 1; 2431 str = kmem_alloc(alloc_size, KM_SLEEP); 2432 for (int i = 0; i < compressed_size; i++) { 2433 size_t offset = i * 2; 2434 (void) snprintf(str + offset, alloc_size - offset, 2435 "%02x", compressed[i]); 2436 } 2437 str[compressed_size * 2] = '\0'; 2438 char *propval = kmem_asprintf("%u-%llx-%llx-%s", 2439 ZFS_SEND_RESUME_TOKEN_VERSION, 2440 (longlong_t)cksum.zc_word[0], 2441 (longlong_t)packed_size, str); 2442 kmem_free(packed, packed_size); 2443 kmem_free(str, alloc_size); 2444 kmem_free(compressed, packed_size); 2445 return (propval); 2446 } 2447 return (kmem_strdup("")); 2448 } 2449 2450 /* 2451 * Returns a string that represents the receive resume stats token of the 2452 * dataset's child. It should be freed with strfree(). 2453 */ 2454 char * 2455 get_child_receive_stats(dsl_dataset_t *ds) 2456 { 2457 char recvname[ZFS_MAX_DATASET_NAME_LEN + 6]; 2458 dsl_dataset_t *recv_ds; 2459 dsl_dataset_name(ds, recvname); 2460 if (strlcat(recvname, "/", sizeof (recvname)) < 2461 sizeof (recvname) && 2462 strlcat(recvname, recv_clone_name, sizeof (recvname)) < 2463 sizeof (recvname) && 2464 dsl_dataset_hold(ds->ds_dir->dd_pool, recvname, FTAG, 2465 &recv_ds) == 0) { 2466 char *propval = get_receive_resume_stats_impl(recv_ds); 2467 dsl_dataset_rele(recv_ds, FTAG); 2468 return (propval); 2469 } 2470 return (kmem_strdup("")); 2471 } 2472 2473 static void 2474 get_receive_resume_stats(dsl_dataset_t *ds, nvlist_t *nv) 2475 { 2476 char *propval = get_receive_resume_stats_impl(ds); 2477 if (strcmp(propval, "") != 0) { 2478 dsl_prop_nvlist_add_string(nv, 2479 ZFS_PROP_RECEIVE_RESUME_TOKEN, propval); 2480 } else { 2481 char *childval = get_child_receive_stats(ds); 2482 if (strcmp(childval, "") != 0) { 2483 dsl_prop_nvlist_add_string(nv, 2484 ZFS_PROP_RECEIVE_RESUME_TOKEN, childval); 2485 } 2486 kmem_strfree(childval); 2487 } 2488 kmem_strfree(propval); 2489 } 2490 2491 uint64_t 2492 dsl_get_refratio(dsl_dataset_t *ds) 2493 { 2494 uint64_t ratio = dsl_dataset_phys(ds)->ds_compressed_bytes == 0 ? 100 : 2495 (dsl_dataset_phys(ds)->ds_uncompressed_bytes * 100 / 2496 dsl_dataset_phys(ds)->ds_compressed_bytes); 2497 return (ratio); 2498 } 2499 2500 uint64_t 2501 dsl_get_logicalreferenced(dsl_dataset_t *ds) 2502 { 2503 return (dsl_dataset_phys(ds)->ds_uncompressed_bytes); 2504 } 2505 2506 uint64_t 2507 dsl_get_compressratio(dsl_dataset_t *ds) 2508 { 2509 if (ds->ds_is_snapshot) { 2510 return (dsl_get_refratio(ds)); 2511 } else { 2512 dsl_dir_t *dd = ds->ds_dir; 2513 mutex_enter(&dd->dd_lock); 2514 uint64_t val = dsl_dir_get_compressratio(dd); 2515 mutex_exit(&dd->dd_lock); 2516 return (val); 2517 } 2518 } 2519 2520 uint64_t 2521 dsl_get_used(dsl_dataset_t *ds) 2522 { 2523 if (ds->ds_is_snapshot) { 2524 return (dsl_dataset_phys(ds)->ds_unique_bytes); 2525 } else { 2526 dsl_dir_t *dd = ds->ds_dir; 2527 mutex_enter(&dd->dd_lock); 2528 uint64_t val = dsl_dir_get_used(dd); 2529 mutex_exit(&dd->dd_lock); 2530 return (val); 2531 } 2532 } 2533 2534 uint64_t 2535 dsl_get_creation(dsl_dataset_t *ds) 2536 { 2537 return (dsl_dataset_phys(ds)->ds_creation_time); 2538 } 2539 2540 uint64_t 2541 dsl_get_creationtxg(dsl_dataset_t *ds) 2542 { 2543 return (dsl_dataset_phys(ds)->ds_creation_txg); 2544 } 2545 2546 uint64_t 2547 dsl_get_refquota(dsl_dataset_t *ds) 2548 { 2549 return (ds->ds_quota); 2550 } 2551 2552 uint64_t 2553 dsl_get_refreservation(dsl_dataset_t *ds) 2554 { 2555 return (ds->ds_reserved); 2556 } 2557 2558 uint64_t 2559 dsl_get_guid(dsl_dataset_t *ds) 2560 { 2561 return (dsl_dataset_phys(ds)->ds_guid); 2562 } 2563 2564 uint64_t 2565 dsl_get_unique(dsl_dataset_t *ds) 2566 { 2567 return (dsl_dataset_phys(ds)->ds_unique_bytes); 2568 } 2569 2570 uint64_t 2571 dsl_get_objsetid(dsl_dataset_t *ds) 2572 { 2573 return (ds->ds_object); 2574 } 2575 2576 uint64_t 2577 dsl_get_userrefs(dsl_dataset_t *ds) 2578 { 2579 return (ds->ds_userrefs); 2580 } 2581 2582 uint64_t 2583 dsl_get_defer_destroy(dsl_dataset_t *ds) 2584 { 2585 return (DS_IS_DEFER_DESTROY(ds) ? 1 : 0); 2586 } 2587 2588 uint64_t 2589 dsl_get_referenced(dsl_dataset_t *ds) 2590 { 2591 return (dsl_dataset_phys(ds)->ds_referenced_bytes); 2592 } 2593 2594 uint64_t 2595 dsl_get_numclones(dsl_dataset_t *ds) 2596 { 2597 ASSERT(ds->ds_is_snapshot); 2598 return (dsl_dataset_phys(ds)->ds_num_children - 1); 2599 } 2600 2601 uint64_t 2602 dsl_get_inconsistent(dsl_dataset_t *ds) 2603 { 2604 return ((dsl_dataset_phys(ds)->ds_flags & DS_FLAG_INCONSISTENT) ? 2605 1 : 0); 2606 } 2607 2608 uint64_t 2609 dsl_get_redacted(dsl_dataset_t *ds) 2610 { 2611 return (dsl_dataset_feature_is_active(ds, 2612 SPA_FEATURE_REDACTED_DATASETS)); 2613 } 2614 2615 uint64_t 2616 dsl_get_available(dsl_dataset_t *ds) 2617 { 2618 uint64_t refdbytes = dsl_get_referenced(ds); 2619 uint64_t availbytes = dsl_dir_space_available(ds->ds_dir, 2620 NULL, 0, TRUE); 2621 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes) { 2622 availbytes += 2623 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes; 2624 } 2625 if (ds->ds_quota != 0) { 2626 /* 2627 * Adjust available bytes according to refquota 2628 */ 2629 if (refdbytes < ds->ds_quota) { 2630 availbytes = MIN(availbytes, 2631 ds->ds_quota - refdbytes); 2632 } else { 2633 availbytes = 0; 2634 } 2635 } 2636 return (availbytes); 2637 } 2638 2639 int 2640 dsl_get_written(dsl_dataset_t *ds, uint64_t *written) 2641 { 2642 dsl_pool_t *dp = ds->ds_dir->dd_pool; 2643 dsl_dataset_t *prev; 2644 int err = dsl_dataset_hold_obj(dp, 2645 dsl_dataset_phys(ds)->ds_prev_snap_obj, FTAG, &prev); 2646 if (err == 0) { 2647 uint64_t comp, uncomp; 2648 err = dsl_dataset_space_written(prev, ds, written, 2649 &comp, &uncomp); 2650 dsl_dataset_rele(prev, FTAG); 2651 } 2652 return (err); 2653 } 2654 2655 /* 2656 * 'snap' should be a buffer of size ZFS_MAX_DATASET_NAME_LEN. 2657 */ 2658 int 2659 dsl_get_prev_snap(dsl_dataset_t *ds, char *snap) 2660 { 2661 dsl_pool_t *dp = ds->ds_dir->dd_pool; 2662 if (ds->ds_prev != NULL && ds->ds_prev != dp->dp_origin_snap) { 2663 dsl_dataset_name(ds->ds_prev, snap); 2664 return (0); 2665 } else { 2666 return (SET_ERROR(ENOENT)); 2667 } 2668 } 2669 2670 void 2671 dsl_get_redact_snaps(dsl_dataset_t *ds, nvlist_t *propval) 2672 { 2673 uint64_t nsnaps; 2674 uint64_t *snaps; 2675 if (dsl_dataset_get_uint64_array_feature(ds, 2676 SPA_FEATURE_REDACTED_DATASETS, &nsnaps, &snaps)) { 2677 fnvlist_add_uint64_array(propval, ZPROP_VALUE, snaps, 2678 nsnaps); 2679 } 2680 } 2681 2682 /* 2683 * Returns the mountpoint property and source for the given dataset in the value 2684 * and source buffers. The value buffer must be at least as large as MAXPATHLEN 2685 * and the source buffer as least as large a ZFS_MAX_DATASET_NAME_LEN. 2686 * Returns 0 on success and an error on failure. 2687 */ 2688 int 2689 dsl_get_mountpoint(dsl_dataset_t *ds, const char *dsname, char *value, 2690 char *source) 2691 { 2692 int error; 2693 dsl_pool_t *dp = ds->ds_dir->dd_pool; 2694 2695 /* Retrieve the mountpoint value stored in the zap object */ 2696 error = dsl_prop_get_ds(ds, zfs_prop_to_name(ZFS_PROP_MOUNTPOINT), 1, 2697 ZAP_MAXVALUELEN, value, source); 2698 if (error != 0) { 2699 return (error); 2700 } 2701 2702 /* 2703 * Process the dsname and source to find the full mountpoint string. 2704 * Can be skipped for 'legacy' or 'none'. 2705 */ 2706 if (value[0] == '/') { 2707 char *buf = kmem_alloc(ZAP_MAXVALUELEN, KM_SLEEP); 2708 char *root = buf; 2709 const char *relpath; 2710 2711 /* 2712 * If we inherit the mountpoint, even from a dataset 2713 * with a received value, the source will be the path of 2714 * the dataset we inherit from. If source is 2715 * ZPROP_SOURCE_VAL_RECVD, the received value is not 2716 * inherited. 2717 */ 2718 if (strcmp(source, ZPROP_SOURCE_VAL_RECVD) == 0) { 2719 relpath = ""; 2720 } else { 2721 ASSERT0(strncmp(dsname, source, strlen(source))); 2722 relpath = dsname + strlen(source); 2723 if (relpath[0] == '/') 2724 relpath++; 2725 } 2726 2727 spa_altroot(dp->dp_spa, root, ZAP_MAXVALUELEN); 2728 2729 /* 2730 * Special case an alternate root of '/'. This will 2731 * avoid having multiple leading slashes in the 2732 * mountpoint path. 2733 */ 2734 if (strcmp(root, "/") == 0) 2735 root++; 2736 2737 /* 2738 * If the mountpoint is '/' then skip over this 2739 * if we are obtaining either an alternate root or 2740 * an inherited mountpoint. 2741 */ 2742 char *mnt = value; 2743 if (value[1] == '\0' && (root[0] != '\0' || 2744 relpath[0] != '\0')) 2745 mnt = value + 1; 2746 2747 if (relpath[0] == '\0') { 2748 (void) snprintf(value, ZAP_MAXVALUELEN, "%s%s", 2749 root, mnt); 2750 } else { 2751 (void) snprintf(value, ZAP_MAXVALUELEN, "%s%s%s%s", 2752 root, mnt, relpath[0] == '@' ? "" : "/", 2753 relpath); 2754 } 2755 kmem_free(buf, ZAP_MAXVALUELEN); 2756 } 2757 2758 return (0); 2759 } 2760 2761 void 2762 dsl_dataset_stats(dsl_dataset_t *ds, nvlist_t *nv) 2763 { 2764 dsl_pool_t *dp = ds->ds_dir->dd_pool; 2765 2766 ASSERT(dsl_pool_config_held(dp)); 2767 2768 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRATIO, 2769 dsl_get_refratio(ds)); 2770 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_LOGICALREFERENCED, 2771 dsl_get_logicalreferenced(ds)); 2772 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_COMPRESSRATIO, 2773 dsl_get_compressratio(ds)); 2774 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USED, 2775 dsl_get_used(ds)); 2776 2777 if (ds->ds_is_snapshot) { 2778 get_clones_stat(ds, nv); 2779 } else { 2780 char buf[ZFS_MAX_DATASET_NAME_LEN]; 2781 if (dsl_get_prev_snap(ds, buf) == 0) 2782 dsl_prop_nvlist_add_string(nv, ZFS_PROP_PREV_SNAP, 2783 buf); 2784 dsl_dir_stats(ds->ds_dir, nv); 2785 } 2786 2787 nvlist_t *propval = fnvlist_alloc(); 2788 dsl_get_redact_snaps(ds, propval); 2789 fnvlist_add_nvlist(nv, zfs_prop_to_name(ZFS_PROP_REDACT_SNAPS), 2790 propval); 2791 nvlist_free(propval); 2792 2793 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_AVAILABLE, 2794 dsl_get_available(ds)); 2795 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFERENCED, 2796 dsl_get_referenced(ds)); 2797 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATION, 2798 dsl_get_creation(ds)); 2799 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATETXG, 2800 dsl_get_creationtxg(ds)); 2801 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFQUOTA, 2802 dsl_get_refquota(ds)); 2803 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRESERVATION, 2804 dsl_get_refreservation(ds)); 2805 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_GUID, 2806 dsl_get_guid(ds)); 2807 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_UNIQUE, 2808 dsl_get_unique(ds)); 2809 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_OBJSETID, 2810 dsl_get_objsetid(ds)); 2811 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USERREFS, 2812 dsl_get_userrefs(ds)); 2813 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_DEFER_DESTROY, 2814 dsl_get_defer_destroy(ds)); 2815 dsl_dataset_crypt_stats(ds, nv); 2816 2817 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) { 2818 uint64_t written; 2819 if (dsl_get_written(ds, &written) == 0) { 2820 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_WRITTEN, 2821 written); 2822 } 2823 } 2824 2825 if (!dsl_dataset_is_snapshot(ds)) { 2826 /* 2827 * A failed "newfs" (e.g. full) resumable receive leaves 2828 * the stats set on this dataset. Check here for the prop. 2829 */ 2830 get_receive_resume_stats(ds, nv); 2831 2832 /* 2833 * A failed incremental resumable receive leaves the 2834 * stats set on our child named "%recv". Check the child 2835 * for the prop. 2836 */ 2837 /* 6 extra bytes for /%recv */ 2838 char recvname[ZFS_MAX_DATASET_NAME_LEN + 6]; 2839 dsl_dataset_t *recv_ds; 2840 dsl_dataset_name(ds, recvname); 2841 if (strlcat(recvname, "/", sizeof (recvname)) < 2842 sizeof (recvname) && 2843 strlcat(recvname, recv_clone_name, sizeof (recvname)) < 2844 sizeof (recvname) && 2845 dsl_dataset_hold(dp, recvname, FTAG, &recv_ds) == 0) { 2846 get_receive_resume_stats(recv_ds, nv); 2847 dsl_dataset_rele(recv_ds, FTAG); 2848 } 2849 } 2850 } 2851 2852 void 2853 dsl_dataset_fast_stat(dsl_dataset_t *ds, dmu_objset_stats_t *stat) 2854 { 2855 dsl_pool_t *dp __maybe_unused = ds->ds_dir->dd_pool; 2856 ASSERT(dsl_pool_config_held(dp)); 2857 2858 stat->dds_creation_txg = dsl_get_creationtxg(ds); 2859 stat->dds_inconsistent = dsl_get_inconsistent(ds); 2860 stat->dds_guid = dsl_get_guid(ds); 2861 stat->dds_redacted = dsl_get_redacted(ds); 2862 stat->dds_origin[0] = '\0'; 2863 if (ds->ds_is_snapshot) { 2864 stat->dds_is_snapshot = B_TRUE; 2865 stat->dds_num_clones = dsl_get_numclones(ds); 2866 } else { 2867 stat->dds_is_snapshot = B_FALSE; 2868 stat->dds_num_clones = 0; 2869 2870 if (dsl_dir_is_clone(ds->ds_dir)) { 2871 dsl_dir_get_origin(ds->ds_dir, stat->dds_origin); 2872 } 2873 } 2874 } 2875 2876 uint64_t 2877 dsl_dataset_fsid_guid(dsl_dataset_t *ds) 2878 { 2879 return (ds->ds_fsid_guid); 2880 } 2881 2882 void 2883 dsl_dataset_space(dsl_dataset_t *ds, 2884 uint64_t *refdbytesp, uint64_t *availbytesp, 2885 uint64_t *usedobjsp, uint64_t *availobjsp) 2886 { 2887 *refdbytesp = dsl_dataset_phys(ds)->ds_referenced_bytes; 2888 *availbytesp = dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE); 2889 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes) 2890 *availbytesp += 2891 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes; 2892 if (ds->ds_quota != 0) { 2893 /* 2894 * Adjust available bytes according to refquota 2895 */ 2896 if (*refdbytesp < ds->ds_quota) 2897 *availbytesp = MIN(*availbytesp, 2898 ds->ds_quota - *refdbytesp); 2899 else 2900 *availbytesp = 0; 2901 } 2902 rrw_enter(&ds->ds_bp_rwlock, RW_READER, FTAG); 2903 *usedobjsp = BP_GET_FILL(&dsl_dataset_phys(ds)->ds_bp); 2904 rrw_exit(&ds->ds_bp_rwlock, FTAG); 2905 *availobjsp = DN_MAX_OBJECT - *usedobjsp; 2906 } 2907 2908 boolean_t 2909 dsl_dataset_modified_since_snap(dsl_dataset_t *ds, dsl_dataset_t *snap) 2910 { 2911 dsl_pool_t *dp __maybe_unused = ds->ds_dir->dd_pool; 2912 uint64_t birth; 2913 2914 ASSERT(dsl_pool_config_held(dp)); 2915 if (snap == NULL) 2916 return (B_FALSE); 2917 rrw_enter(&ds->ds_bp_rwlock, RW_READER, FTAG); 2918 birth = dsl_dataset_get_blkptr(ds)->blk_birth; 2919 rrw_exit(&ds->ds_bp_rwlock, FTAG); 2920 if (birth > dsl_dataset_phys(snap)->ds_creation_txg) { 2921 objset_t *os, *os_snap; 2922 /* 2923 * It may be that only the ZIL differs, because it was 2924 * reset in the head. Don't count that as being 2925 * modified. 2926 */ 2927 if (dmu_objset_from_ds(ds, &os) != 0) 2928 return (B_TRUE); 2929 if (dmu_objset_from_ds(snap, &os_snap) != 0) 2930 return (B_TRUE); 2931 return (bcmp(&os->os_phys->os_meta_dnode, 2932 &os_snap->os_phys->os_meta_dnode, 2933 sizeof (os->os_phys->os_meta_dnode)) != 0); 2934 } 2935 return (B_FALSE); 2936 } 2937 2938 typedef struct dsl_dataset_rename_snapshot_arg { 2939 const char *ddrsa_fsname; 2940 const char *ddrsa_oldsnapname; 2941 const char *ddrsa_newsnapname; 2942 boolean_t ddrsa_recursive; 2943 dmu_tx_t *ddrsa_tx; 2944 } dsl_dataset_rename_snapshot_arg_t; 2945 2946 /* ARGSUSED */ 2947 static int 2948 dsl_dataset_rename_snapshot_check_impl(dsl_pool_t *dp, 2949 dsl_dataset_t *hds, void *arg) 2950 { 2951 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 2952 int error; 2953 uint64_t val; 2954 2955 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val); 2956 if (error != 0) { 2957 /* ignore nonexistent snapshots */ 2958 return (error == ENOENT ? 0 : error); 2959 } 2960 2961 /* new name should not exist */ 2962 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_newsnapname, &val); 2963 if (error == 0) 2964 error = SET_ERROR(EEXIST); 2965 else if (error == ENOENT) 2966 error = 0; 2967 2968 /* dataset name + 1 for the "@" + the new snapshot name must fit */ 2969 if (dsl_dir_namelen(hds->ds_dir) + 1 + 2970 strlen(ddrsa->ddrsa_newsnapname) >= ZFS_MAX_DATASET_NAME_LEN) 2971 error = SET_ERROR(ENAMETOOLONG); 2972 2973 return (error); 2974 } 2975 2976 static int 2977 dsl_dataset_rename_snapshot_check(void *arg, dmu_tx_t *tx) 2978 { 2979 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 2980 dsl_pool_t *dp = dmu_tx_pool(tx); 2981 dsl_dataset_t *hds; 2982 int error; 2983 2984 error = dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds); 2985 if (error != 0) 2986 return (error); 2987 2988 if (ddrsa->ddrsa_recursive) { 2989 error = dmu_objset_find_dp(dp, hds->ds_dir->dd_object, 2990 dsl_dataset_rename_snapshot_check_impl, ddrsa, 2991 DS_FIND_CHILDREN); 2992 } else { 2993 error = dsl_dataset_rename_snapshot_check_impl(dp, hds, ddrsa); 2994 } 2995 dsl_dataset_rele(hds, FTAG); 2996 return (error); 2997 } 2998 2999 static int 3000 dsl_dataset_rename_snapshot_sync_impl(dsl_pool_t *dp, 3001 dsl_dataset_t *hds, void *arg) 3002 { 3003 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 3004 dsl_dataset_t *ds; 3005 uint64_t val; 3006 dmu_tx_t *tx = ddrsa->ddrsa_tx; 3007 int error; 3008 3009 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val); 3010 ASSERT(error == 0 || error == ENOENT); 3011 if (error == ENOENT) { 3012 /* ignore nonexistent snapshots */ 3013 return (0); 3014 } 3015 3016 VERIFY0(dsl_dataset_hold_obj(dp, val, FTAG, &ds)); 3017 3018 /* log before we change the name */ 3019 spa_history_log_internal_ds(ds, "rename", tx, 3020 "-> @%s", ddrsa->ddrsa_newsnapname); 3021 3022 VERIFY0(dsl_dataset_snap_remove(hds, ddrsa->ddrsa_oldsnapname, tx, 3023 B_FALSE)); 3024 mutex_enter(&ds->ds_lock); 3025 (void) strlcpy(ds->ds_snapname, ddrsa->ddrsa_newsnapname, 3026 sizeof (ds->ds_snapname)); 3027 mutex_exit(&ds->ds_lock); 3028 VERIFY0(zap_add(dp->dp_meta_objset, 3029 dsl_dataset_phys(hds)->ds_snapnames_zapobj, 3030 ds->ds_snapname, 8, 1, &ds->ds_object, tx)); 3031 zvol_rename_minors(dp->dp_spa, ddrsa->ddrsa_oldsnapname, 3032 ddrsa->ddrsa_newsnapname, B_TRUE); 3033 3034 dsl_dataset_rele(ds, FTAG); 3035 return (0); 3036 } 3037 3038 static void 3039 dsl_dataset_rename_snapshot_sync(void *arg, dmu_tx_t *tx) 3040 { 3041 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 3042 dsl_pool_t *dp = dmu_tx_pool(tx); 3043 dsl_dataset_t *hds = NULL; 3044 3045 VERIFY0(dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds)); 3046 ddrsa->ddrsa_tx = tx; 3047 if (ddrsa->ddrsa_recursive) { 3048 VERIFY0(dmu_objset_find_dp(dp, hds->ds_dir->dd_object, 3049 dsl_dataset_rename_snapshot_sync_impl, ddrsa, 3050 DS_FIND_CHILDREN)); 3051 } else { 3052 VERIFY0(dsl_dataset_rename_snapshot_sync_impl(dp, hds, ddrsa)); 3053 } 3054 dsl_dataset_rele(hds, FTAG); 3055 } 3056 3057 int 3058 dsl_dataset_rename_snapshot(const char *fsname, 3059 const char *oldsnapname, const char *newsnapname, boolean_t recursive) 3060 { 3061 dsl_dataset_rename_snapshot_arg_t ddrsa; 3062 3063 ddrsa.ddrsa_fsname = fsname; 3064 ddrsa.ddrsa_oldsnapname = oldsnapname; 3065 ddrsa.ddrsa_newsnapname = newsnapname; 3066 ddrsa.ddrsa_recursive = recursive; 3067 3068 return (dsl_sync_task(fsname, dsl_dataset_rename_snapshot_check, 3069 dsl_dataset_rename_snapshot_sync, &ddrsa, 3070 1, ZFS_SPACE_CHECK_RESERVED)); 3071 } 3072 3073 /* 3074 * If we're doing an ownership handoff, we need to make sure that there is 3075 * only one long hold on the dataset. We're not allowed to change anything here 3076 * so we don't permanently release the long hold or regular hold here. We want 3077 * to do this only when syncing to avoid the dataset unexpectedly going away 3078 * when we release the long hold. 3079 */ 3080 static int 3081 dsl_dataset_handoff_check(dsl_dataset_t *ds, void *owner, dmu_tx_t *tx) 3082 { 3083 boolean_t held = B_FALSE; 3084 3085 if (!dmu_tx_is_syncing(tx)) 3086 return (0); 3087 3088 dsl_dir_t *dd = ds->ds_dir; 3089 mutex_enter(&dd->dd_activity_lock); 3090 uint64_t holds = zfs_refcount_count(&ds->ds_longholds) - 3091 (owner != NULL ? 1 : 0); 3092 /* 3093 * The value of dd_activity_waiters can chance as soon as we drop the 3094 * lock, but we're fine with that; new waiters coming in or old 3095 * waiters leaving doesn't cause problems, since we're going to cancel 3096 * waiters later anyway. The goal of this check is to verify that no 3097 * non-waiters have long-holds, and all new long-holds will be 3098 * prevented because we're holding the pool config as writer. 3099 */ 3100 if (holds != dd->dd_activity_waiters) 3101 held = B_TRUE; 3102 mutex_exit(&dd->dd_activity_lock); 3103 3104 if (held) 3105 return (SET_ERROR(EBUSY)); 3106 3107 return (0); 3108 } 3109 3110 int 3111 dsl_dataset_rollback_check(void *arg, dmu_tx_t *tx) 3112 { 3113 dsl_dataset_rollback_arg_t *ddra = arg; 3114 dsl_pool_t *dp = dmu_tx_pool(tx); 3115 dsl_dataset_t *ds; 3116 int64_t unused_refres_delta; 3117 int error; 3118 3119 error = dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds); 3120 if (error != 0) 3121 return (error); 3122 3123 /* must not be a snapshot */ 3124 if (ds->ds_is_snapshot) { 3125 dsl_dataset_rele(ds, FTAG); 3126 return (SET_ERROR(EINVAL)); 3127 } 3128 3129 /* must have a most recent snapshot */ 3130 if (dsl_dataset_phys(ds)->ds_prev_snap_txg < TXG_INITIAL) { 3131 dsl_dataset_rele(ds, FTAG); 3132 return (SET_ERROR(ESRCH)); 3133 } 3134 3135 /* 3136 * No rollback to a snapshot created in the current txg, because 3137 * the rollback may dirty the dataset and create blocks that are 3138 * not reachable from the rootbp while having a birth txg that 3139 * falls into the snapshot's range. 3140 */ 3141 if (dmu_tx_is_syncing(tx) && 3142 dsl_dataset_phys(ds)->ds_prev_snap_txg >= tx->tx_txg) { 3143 dsl_dataset_rele(ds, FTAG); 3144 return (SET_ERROR(EAGAIN)); 3145 } 3146 3147 /* 3148 * If the expected target snapshot is specified, then check that 3149 * the latest snapshot is it. 3150 */ 3151 if (ddra->ddra_tosnap != NULL) { 3152 dsl_dataset_t *snapds; 3153 3154 /* Check if the target snapshot exists at all. */ 3155 error = dsl_dataset_hold(dp, ddra->ddra_tosnap, FTAG, &snapds); 3156 if (error != 0) { 3157 /* 3158 * ESRCH is used to signal that the target snapshot does 3159 * not exist, while ENOENT is used to report that 3160 * the rolled back dataset does not exist. 3161 * ESRCH is also used to cover other cases where the 3162 * target snapshot is not related to the dataset being 3163 * rolled back such as being in a different pool. 3164 */ 3165 if (error == ENOENT || error == EXDEV) 3166 error = SET_ERROR(ESRCH); 3167 dsl_dataset_rele(ds, FTAG); 3168 return (error); 3169 } 3170 ASSERT(snapds->ds_is_snapshot); 3171 3172 /* Check if the snapshot is the latest snapshot indeed. */ 3173 if (snapds != ds->ds_prev) { 3174 /* 3175 * Distinguish between the case where the only problem 3176 * is intervening snapshots (EEXIST) vs the snapshot 3177 * not being a valid target for rollback (ESRCH). 3178 */ 3179 if (snapds->ds_dir == ds->ds_dir || 3180 (dsl_dir_is_clone(ds->ds_dir) && 3181 dsl_dir_phys(ds->ds_dir)->dd_origin_obj == 3182 snapds->ds_object)) { 3183 error = SET_ERROR(EEXIST); 3184 } else { 3185 error = SET_ERROR(ESRCH); 3186 } 3187 dsl_dataset_rele(snapds, FTAG); 3188 dsl_dataset_rele(ds, FTAG); 3189 return (error); 3190 } 3191 dsl_dataset_rele(snapds, FTAG); 3192 } 3193 3194 /* must not have any bookmarks after the most recent snapshot */ 3195 if (dsl_bookmark_latest_txg(ds) > 3196 dsl_dataset_phys(ds)->ds_prev_snap_txg) { 3197 dsl_dataset_rele(ds, FTAG); 3198 return (SET_ERROR(EEXIST)); 3199 } 3200 3201 error = dsl_dataset_handoff_check(ds, ddra->ddra_owner, tx); 3202 if (error != 0) { 3203 dsl_dataset_rele(ds, FTAG); 3204 return (error); 3205 } 3206 3207 /* 3208 * Check if the snap we are rolling back to uses more than 3209 * the refquota. 3210 */ 3211 if (ds->ds_quota != 0 && 3212 dsl_dataset_phys(ds->ds_prev)->ds_referenced_bytes > ds->ds_quota) { 3213 dsl_dataset_rele(ds, FTAG); 3214 return (SET_ERROR(EDQUOT)); 3215 } 3216 3217 /* 3218 * When we do the clone swap, we will temporarily use more space 3219 * due to the refreservation (the head will no longer have any 3220 * unique space, so the entire amount of the refreservation will need 3221 * to be free). We will immediately destroy the clone, freeing 3222 * this space, but the freeing happens over many txg's. 3223 */ 3224 unused_refres_delta = (int64_t)MIN(ds->ds_reserved, 3225 dsl_dataset_phys(ds)->ds_unique_bytes); 3226 3227 if (unused_refres_delta > 0 && 3228 unused_refres_delta > 3229 dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE)) { 3230 dsl_dataset_rele(ds, FTAG); 3231 return (SET_ERROR(ENOSPC)); 3232 } 3233 3234 dsl_dataset_rele(ds, FTAG); 3235 return (0); 3236 } 3237 3238 void 3239 dsl_dataset_rollback_sync(void *arg, dmu_tx_t *tx) 3240 { 3241 dsl_dataset_rollback_arg_t *ddra = arg; 3242 dsl_pool_t *dp = dmu_tx_pool(tx); 3243 dsl_dataset_t *ds, *clone; 3244 uint64_t cloneobj; 3245 char namebuf[ZFS_MAX_DATASET_NAME_LEN]; 3246 3247 VERIFY0(dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds)); 3248 3249 dsl_dataset_name(ds->ds_prev, namebuf); 3250 fnvlist_add_string(ddra->ddra_result, "target", namebuf); 3251 3252 cloneobj = dsl_dataset_create_sync(ds->ds_dir, "%rollback", 3253 ds->ds_prev, DS_CREATE_FLAG_NODIRTY, kcred, NULL, tx); 3254 3255 VERIFY0(dsl_dataset_hold_obj(dp, cloneobj, FTAG, &clone)); 3256 3257 dsl_dataset_clone_swap_sync_impl(clone, ds, tx); 3258 dsl_dataset_zero_zil(ds, tx); 3259 3260 dsl_destroy_head_sync_impl(clone, tx); 3261 3262 dsl_dataset_rele(clone, FTAG); 3263 dsl_dataset_rele(ds, FTAG); 3264 } 3265 3266 /* 3267 * Rolls back the given filesystem or volume to the most recent snapshot. 3268 * The name of the most recent snapshot will be returned under key "target" 3269 * in the result nvlist. 3270 * 3271 * If owner != NULL: 3272 * - The existing dataset MUST be owned by the specified owner at entry 3273 * - Upon return, dataset will still be held by the same owner, whether we 3274 * succeed or not. 3275 * 3276 * This mode is required any time the existing filesystem is mounted. See 3277 * notes above zfs_suspend_fs() for further details. 3278 */ 3279 int 3280 dsl_dataset_rollback(const char *fsname, const char *tosnap, void *owner, 3281 nvlist_t *result) 3282 { 3283 dsl_dataset_rollback_arg_t ddra; 3284 3285 ddra.ddra_fsname = fsname; 3286 ddra.ddra_tosnap = tosnap; 3287 ddra.ddra_owner = owner; 3288 ddra.ddra_result = result; 3289 3290 return (dsl_sync_task(fsname, dsl_dataset_rollback_check, 3291 dsl_dataset_rollback_sync, &ddra, 3292 1, ZFS_SPACE_CHECK_RESERVED)); 3293 } 3294 3295 struct promotenode { 3296 list_node_t link; 3297 dsl_dataset_t *ds; 3298 }; 3299 3300 static int snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep); 3301 static int promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp, 3302 void *tag); 3303 static void promote_rele(dsl_dataset_promote_arg_t *ddpa, void *tag); 3304 3305 int 3306 dsl_dataset_promote_check(void *arg, dmu_tx_t *tx) 3307 { 3308 dsl_dataset_promote_arg_t *ddpa = arg; 3309 dsl_pool_t *dp = dmu_tx_pool(tx); 3310 dsl_dataset_t *hds; 3311 struct promotenode *snap; 3312 dsl_dataset_t *origin_ds, *origin_head; 3313 int err; 3314 uint64_t unused; 3315 uint64_t ss_mv_cnt; 3316 size_t max_snap_len; 3317 boolean_t conflicting_snaps; 3318 3319 err = promote_hold(ddpa, dp, FTAG); 3320 if (err != 0) 3321 return (err); 3322 3323 hds = ddpa->ddpa_clone; 3324 max_snap_len = MAXNAMELEN - strlen(ddpa->ddpa_clonename) - 1; 3325 3326 if (dsl_dataset_phys(hds)->ds_flags & DS_FLAG_NOPROMOTE) { 3327 promote_rele(ddpa, FTAG); 3328 return (SET_ERROR(EXDEV)); 3329 } 3330 3331 snap = list_head(&ddpa->shared_snaps); 3332 origin_head = snap->ds; 3333 if (snap == NULL) { 3334 err = SET_ERROR(ENOENT); 3335 goto out; 3336 } 3337 origin_ds = snap->ds; 3338 3339 /* 3340 * Encrypted clones share a DSL Crypto Key with their origin's dsl dir. 3341 * When doing a promote we must make sure the encryption root for 3342 * both the target and the target's origin does not change to avoid 3343 * needing to rewrap encryption keys 3344 */ 3345 err = dsl_dataset_promote_crypt_check(hds->ds_dir, origin_ds->ds_dir); 3346 if (err != 0) 3347 goto out; 3348 3349 /* 3350 * Compute and check the amount of space to transfer. Since this is 3351 * so expensive, don't do the preliminary check. 3352 */ 3353 if (!dmu_tx_is_syncing(tx)) { 3354 promote_rele(ddpa, FTAG); 3355 return (0); 3356 } 3357 3358 /* compute origin's new unique space */ 3359 snap = list_tail(&ddpa->clone_snaps); 3360 ASSERT(snap != NULL); 3361 ASSERT3U(dsl_dataset_phys(snap->ds)->ds_prev_snap_obj, ==, 3362 origin_ds->ds_object); 3363 dsl_deadlist_space_range(&snap->ds->ds_deadlist, 3364 dsl_dataset_phys(origin_ds)->ds_prev_snap_txg, UINT64_MAX, 3365 &ddpa->unique, &unused, &unused); 3366 3367 /* 3368 * Walk the snapshots that we are moving 3369 * 3370 * Compute space to transfer. Consider the incremental changes 3371 * to used by each snapshot: 3372 * (my used) = (prev's used) + (blocks born) - (blocks killed) 3373 * So each snapshot gave birth to: 3374 * (blocks born) = (my used) - (prev's used) + (blocks killed) 3375 * So a sequence would look like: 3376 * (uN - u(N-1) + kN) + ... + (u1 - u0 + k1) + (u0 - 0 + k0) 3377 * Which simplifies to: 3378 * uN + kN + kN-1 + ... + k1 + k0 3379 * Note however, if we stop before we reach the ORIGIN we get: 3380 * uN + kN + kN-1 + ... + kM - uM-1 3381 */ 3382 conflicting_snaps = B_FALSE; 3383 ss_mv_cnt = 0; 3384 ddpa->used = dsl_dataset_phys(origin_ds)->ds_referenced_bytes; 3385 ddpa->comp = dsl_dataset_phys(origin_ds)->ds_compressed_bytes; 3386 ddpa->uncomp = dsl_dataset_phys(origin_ds)->ds_uncompressed_bytes; 3387 for (snap = list_head(&ddpa->shared_snaps); snap; 3388 snap = list_next(&ddpa->shared_snaps, snap)) { 3389 uint64_t val, dlused, dlcomp, dluncomp; 3390 dsl_dataset_t *ds = snap->ds; 3391 3392 ss_mv_cnt++; 3393 3394 /* 3395 * If there are long holds, we won't be able to evict 3396 * the objset. 3397 */ 3398 if (dsl_dataset_long_held(ds)) { 3399 err = SET_ERROR(EBUSY); 3400 goto out; 3401 } 3402 3403 /* Check that the snapshot name does not conflict */ 3404 VERIFY0(dsl_dataset_get_snapname(ds)); 3405 if (strlen(ds->ds_snapname) >= max_snap_len) { 3406 err = SET_ERROR(ENAMETOOLONG); 3407 goto out; 3408 } 3409 err = dsl_dataset_snap_lookup(hds, ds->ds_snapname, &val); 3410 if (err == 0) { 3411 fnvlist_add_boolean(ddpa->err_ds, 3412 snap->ds->ds_snapname); 3413 conflicting_snaps = B_TRUE; 3414 } else if (err != ENOENT) { 3415 goto out; 3416 } 3417 3418 /* The very first snapshot does not have a deadlist */ 3419 if (dsl_dataset_phys(ds)->ds_prev_snap_obj == 0) 3420 continue; 3421 3422 dsl_deadlist_space(&ds->ds_deadlist, 3423 &dlused, &dlcomp, &dluncomp); 3424 ddpa->used += dlused; 3425 ddpa->comp += dlcomp; 3426 ddpa->uncomp += dluncomp; 3427 } 3428 3429 /* 3430 * Check that bookmarks that are being transferred don't have 3431 * name conflicts. 3432 */ 3433 for (dsl_bookmark_node_t *dbn = avl_first(&origin_head->ds_bookmarks); 3434 dbn != NULL && dbn->dbn_phys.zbm_creation_txg <= 3435 dsl_dataset_phys(origin_ds)->ds_creation_txg; 3436 dbn = AVL_NEXT(&origin_head->ds_bookmarks, dbn)) { 3437 if (strlen(dbn->dbn_name) >= max_snap_len) { 3438 err = SET_ERROR(ENAMETOOLONG); 3439 goto out; 3440 } 3441 zfs_bookmark_phys_t bm; 3442 err = dsl_bookmark_lookup_impl(ddpa->ddpa_clone, 3443 dbn->dbn_name, &bm); 3444 3445 if (err == 0) { 3446 fnvlist_add_boolean(ddpa->err_ds, dbn->dbn_name); 3447 conflicting_snaps = B_TRUE; 3448 } else if (err == ESRCH) { 3449 err = 0; 3450 } else if (err != 0) { 3451 goto out; 3452 } 3453 } 3454 3455 /* 3456 * In order to return the full list of conflicting snapshots, we check 3457 * whether there was a conflict after traversing all of them. 3458 */ 3459 if (conflicting_snaps) { 3460 err = SET_ERROR(EEXIST); 3461 goto out; 3462 } 3463 3464 /* 3465 * If we are a clone of a clone then we never reached ORIGIN, 3466 * so we need to subtract out the clone origin's used space. 3467 */ 3468 if (ddpa->origin_origin) { 3469 ddpa->used -= 3470 dsl_dataset_phys(ddpa->origin_origin)->ds_referenced_bytes; 3471 ddpa->comp -= 3472 dsl_dataset_phys(ddpa->origin_origin)->ds_compressed_bytes; 3473 ddpa->uncomp -= 3474 dsl_dataset_phys(ddpa->origin_origin)-> 3475 ds_uncompressed_bytes; 3476 } 3477 3478 /* Check that there is enough space and limit headroom here */ 3479 err = dsl_dir_transfer_possible(origin_ds->ds_dir, hds->ds_dir, 3480 0, ss_mv_cnt, ddpa->used, ddpa->cr, ddpa->proc); 3481 if (err != 0) 3482 goto out; 3483 3484 /* 3485 * Compute the amounts of space that will be used by snapshots 3486 * after the promotion (for both origin and clone). For each, 3487 * it is the amount of space that will be on all of their 3488 * deadlists (that was not born before their new origin). 3489 */ 3490 if (dsl_dir_phys(hds->ds_dir)->dd_flags & DD_FLAG_USED_BREAKDOWN) { 3491 uint64_t space; 3492 3493 /* 3494 * Note, typically this will not be a clone of a clone, 3495 * so dd_origin_txg will be < TXG_INITIAL, so 3496 * these snaplist_space() -> dsl_deadlist_space_range() 3497 * calls will be fast because they do not have to 3498 * iterate over all bps. 3499 */ 3500 snap = list_head(&ddpa->origin_snaps); 3501 if (snap == NULL) { 3502 err = SET_ERROR(ENOENT); 3503 goto out; 3504 } 3505 err = snaplist_space(&ddpa->shared_snaps, 3506 snap->ds->ds_dir->dd_origin_txg, &ddpa->cloneusedsnap); 3507 if (err != 0) 3508 goto out; 3509 3510 err = snaplist_space(&ddpa->clone_snaps, 3511 snap->ds->ds_dir->dd_origin_txg, &space); 3512 if (err != 0) 3513 goto out; 3514 ddpa->cloneusedsnap += space; 3515 } 3516 if (dsl_dir_phys(origin_ds->ds_dir)->dd_flags & 3517 DD_FLAG_USED_BREAKDOWN) { 3518 err = snaplist_space(&ddpa->origin_snaps, 3519 dsl_dataset_phys(origin_ds)->ds_creation_txg, 3520 &ddpa->originusedsnap); 3521 if (err != 0) 3522 goto out; 3523 } 3524 3525 out: 3526 promote_rele(ddpa, FTAG); 3527 return (err); 3528 } 3529 3530 void 3531 dsl_dataset_promote_sync(void *arg, dmu_tx_t *tx) 3532 { 3533 dsl_dataset_promote_arg_t *ddpa = arg; 3534 dsl_pool_t *dp = dmu_tx_pool(tx); 3535 dsl_dataset_t *hds; 3536 struct promotenode *snap; 3537 dsl_dataset_t *origin_ds; 3538 dsl_dataset_t *origin_head; 3539 dsl_dir_t *dd; 3540 dsl_dir_t *odd = NULL; 3541 uint64_t oldnext_obj; 3542 int64_t delta; 3543 3544 ASSERT(nvlist_empty(ddpa->err_ds)); 3545 3546 VERIFY0(promote_hold(ddpa, dp, FTAG)); 3547 hds = ddpa->ddpa_clone; 3548 3549 ASSERT0(dsl_dataset_phys(hds)->ds_flags & DS_FLAG_NOPROMOTE); 3550 3551 snap = list_head(&ddpa->shared_snaps); 3552 origin_ds = snap->ds; 3553 dd = hds->ds_dir; 3554 3555 snap = list_head(&ddpa->origin_snaps); 3556 origin_head = snap->ds; 3557 3558 /* 3559 * We need to explicitly open odd, since origin_ds's dd will be 3560 * changing. 3561 */ 3562 VERIFY0(dsl_dir_hold_obj(dp, origin_ds->ds_dir->dd_object, 3563 NULL, FTAG, &odd)); 3564 3565 dsl_dataset_promote_crypt_sync(hds->ds_dir, odd, tx); 3566 3567 /* change origin's next snap */ 3568 dmu_buf_will_dirty(origin_ds->ds_dbuf, tx); 3569 oldnext_obj = dsl_dataset_phys(origin_ds)->ds_next_snap_obj; 3570 snap = list_tail(&ddpa->clone_snaps); 3571 ASSERT3U(dsl_dataset_phys(snap->ds)->ds_prev_snap_obj, ==, 3572 origin_ds->ds_object); 3573 dsl_dataset_phys(origin_ds)->ds_next_snap_obj = snap->ds->ds_object; 3574 3575 /* change the origin's next clone */ 3576 if (dsl_dataset_phys(origin_ds)->ds_next_clones_obj) { 3577 dsl_dataset_remove_from_next_clones(origin_ds, 3578 snap->ds->ds_object, tx); 3579 VERIFY0(zap_add_int(dp->dp_meta_objset, 3580 dsl_dataset_phys(origin_ds)->ds_next_clones_obj, 3581 oldnext_obj, tx)); 3582 } 3583 3584 /* change origin */ 3585 dmu_buf_will_dirty(dd->dd_dbuf, tx); 3586 ASSERT3U(dsl_dir_phys(dd)->dd_origin_obj, ==, origin_ds->ds_object); 3587 dsl_dir_phys(dd)->dd_origin_obj = dsl_dir_phys(odd)->dd_origin_obj; 3588 dd->dd_origin_txg = origin_head->ds_dir->dd_origin_txg; 3589 dmu_buf_will_dirty(odd->dd_dbuf, tx); 3590 dsl_dir_phys(odd)->dd_origin_obj = origin_ds->ds_object; 3591 origin_head->ds_dir->dd_origin_txg = 3592 dsl_dataset_phys(origin_ds)->ds_creation_txg; 3593 3594 /* change dd_clone entries */ 3595 if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 3596 VERIFY0(zap_remove_int(dp->dp_meta_objset, 3597 dsl_dir_phys(odd)->dd_clones, hds->ds_object, tx)); 3598 VERIFY0(zap_add_int(dp->dp_meta_objset, 3599 dsl_dir_phys(ddpa->origin_origin->ds_dir)->dd_clones, 3600 hds->ds_object, tx)); 3601 3602 VERIFY0(zap_remove_int(dp->dp_meta_objset, 3603 dsl_dir_phys(ddpa->origin_origin->ds_dir)->dd_clones, 3604 origin_head->ds_object, tx)); 3605 if (dsl_dir_phys(dd)->dd_clones == 0) { 3606 dsl_dir_phys(dd)->dd_clones = 3607 zap_create(dp->dp_meta_objset, DMU_OT_DSL_CLONES, 3608 DMU_OT_NONE, 0, tx); 3609 } 3610 VERIFY0(zap_add_int(dp->dp_meta_objset, 3611 dsl_dir_phys(dd)->dd_clones, origin_head->ds_object, tx)); 3612 } 3613 3614 /* 3615 * Move bookmarks to this dir. 3616 */ 3617 dsl_bookmark_node_t *dbn_next; 3618 for (dsl_bookmark_node_t *dbn = avl_first(&origin_head->ds_bookmarks); 3619 dbn != NULL && dbn->dbn_phys.zbm_creation_txg <= 3620 dsl_dataset_phys(origin_ds)->ds_creation_txg; 3621 dbn = dbn_next) { 3622 dbn_next = AVL_NEXT(&origin_head->ds_bookmarks, dbn); 3623 3624 avl_remove(&origin_head->ds_bookmarks, dbn); 3625 VERIFY0(zap_remove(dp->dp_meta_objset, 3626 origin_head->ds_bookmarks_obj, dbn->dbn_name, tx)); 3627 3628 dsl_bookmark_node_add(hds, dbn, tx); 3629 } 3630 3631 dsl_bookmark_next_changed(hds, origin_ds, tx); 3632 3633 /* move snapshots to this dir */ 3634 for (snap = list_head(&ddpa->shared_snaps); snap; 3635 snap = list_next(&ddpa->shared_snaps, snap)) { 3636 dsl_dataset_t *ds = snap->ds; 3637 3638 /* 3639 * Property callbacks are registered to a particular 3640 * dsl_dir. Since ours is changing, evict the objset 3641 * so that they will be unregistered from the old dsl_dir. 3642 */ 3643 if (ds->ds_objset) { 3644 dmu_objset_evict(ds->ds_objset); 3645 ds->ds_objset = NULL; 3646 } 3647 3648 /* move snap name entry */ 3649 VERIFY0(dsl_dataset_get_snapname(ds)); 3650 VERIFY0(dsl_dataset_snap_remove(origin_head, 3651 ds->ds_snapname, tx, B_TRUE)); 3652 VERIFY0(zap_add(dp->dp_meta_objset, 3653 dsl_dataset_phys(hds)->ds_snapnames_zapobj, ds->ds_snapname, 3654 8, 1, &ds->ds_object, tx)); 3655 dsl_fs_ss_count_adjust(hds->ds_dir, 1, 3656 DD_FIELD_SNAPSHOT_COUNT, tx); 3657 3658 /* change containing dsl_dir */ 3659 dmu_buf_will_dirty(ds->ds_dbuf, tx); 3660 ASSERT3U(dsl_dataset_phys(ds)->ds_dir_obj, ==, odd->dd_object); 3661 dsl_dataset_phys(ds)->ds_dir_obj = dd->dd_object; 3662 ASSERT3P(ds->ds_dir, ==, odd); 3663 dsl_dir_rele(ds->ds_dir, ds); 3664 VERIFY0(dsl_dir_hold_obj(dp, dd->dd_object, 3665 NULL, ds, &ds->ds_dir)); 3666 3667 /* move any clone references */ 3668 if (dsl_dataset_phys(ds)->ds_next_clones_obj && 3669 spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 3670 zap_cursor_t zc; 3671 zap_attribute_t za; 3672 3673 for (zap_cursor_init(&zc, dp->dp_meta_objset, 3674 dsl_dataset_phys(ds)->ds_next_clones_obj); 3675 zap_cursor_retrieve(&zc, &za) == 0; 3676 zap_cursor_advance(&zc)) { 3677 dsl_dataset_t *cnds; 3678 uint64_t o; 3679 3680 if (za.za_first_integer == oldnext_obj) { 3681 /* 3682 * We've already moved the 3683 * origin's reference. 3684 */ 3685 continue; 3686 } 3687 3688 VERIFY0(dsl_dataset_hold_obj(dp, 3689 za.za_first_integer, FTAG, &cnds)); 3690 o = dsl_dir_phys(cnds->ds_dir)-> 3691 dd_head_dataset_obj; 3692 3693 VERIFY0(zap_remove_int(dp->dp_meta_objset, 3694 dsl_dir_phys(odd)->dd_clones, o, tx)); 3695 VERIFY0(zap_add_int(dp->dp_meta_objset, 3696 dsl_dir_phys(dd)->dd_clones, o, tx)); 3697 dsl_dataset_rele(cnds, FTAG); 3698 } 3699 zap_cursor_fini(&zc); 3700 } 3701 3702 ASSERT(!dsl_prop_hascb(ds)); 3703 } 3704 3705 /* 3706 * Change space accounting. 3707 * Note, pa->*usedsnap and dd_used_breakdown[SNAP] will either 3708 * both be valid, or both be 0 (resulting in delta == 0). This 3709 * is true for each of {clone,origin} independently. 3710 */ 3711 3712 delta = ddpa->cloneusedsnap - 3713 dsl_dir_phys(dd)->dd_used_breakdown[DD_USED_SNAP]; 3714 ASSERT3S(delta, >=, 0); 3715 ASSERT3U(ddpa->used, >=, delta); 3716 dsl_dir_diduse_space(dd, DD_USED_SNAP, delta, 0, 0, tx); 3717 dsl_dir_diduse_space(dd, DD_USED_HEAD, 3718 ddpa->used - delta, ddpa->comp, ddpa->uncomp, tx); 3719 3720 delta = ddpa->originusedsnap - 3721 dsl_dir_phys(odd)->dd_used_breakdown[DD_USED_SNAP]; 3722 ASSERT3S(delta, <=, 0); 3723 ASSERT3U(ddpa->used, >=, -delta); 3724 dsl_dir_diduse_space(odd, DD_USED_SNAP, delta, 0, 0, tx); 3725 dsl_dir_diduse_space(odd, DD_USED_HEAD, 3726 -ddpa->used - delta, -ddpa->comp, -ddpa->uncomp, tx); 3727 3728 dsl_dataset_phys(origin_ds)->ds_unique_bytes = ddpa->unique; 3729 3730 /* 3731 * Since livelists are specific to a clone's origin txg, they 3732 * are no longer accurate. Destroy the livelist from the clone being 3733 * promoted. If the origin dataset is a clone, destroy its livelist 3734 * as well. 3735 */ 3736 dsl_dir_remove_livelist(dd, tx, B_TRUE); 3737 dsl_dir_remove_livelist(odd, tx, B_TRUE); 3738 3739 /* log history record */ 3740 spa_history_log_internal_ds(hds, "promote", tx, " "); 3741 3742 dsl_dir_rele(odd, FTAG); 3743 promote_rele(ddpa, FTAG); 3744 } 3745 3746 /* 3747 * Make a list of dsl_dataset_t's for the snapshots between first_obj 3748 * (exclusive) and last_obj (inclusive). The list will be in reverse 3749 * order (last_obj will be the list_head()). If first_obj == 0, do all 3750 * snapshots back to this dataset's origin. 3751 */ 3752 static int 3753 snaplist_make(dsl_pool_t *dp, 3754 uint64_t first_obj, uint64_t last_obj, list_t *l, void *tag) 3755 { 3756 uint64_t obj = last_obj; 3757 3758 list_create(l, sizeof (struct promotenode), 3759 offsetof(struct promotenode, link)); 3760 3761 while (obj != first_obj) { 3762 dsl_dataset_t *ds; 3763 struct promotenode *snap; 3764 int err; 3765 3766 err = dsl_dataset_hold_obj(dp, obj, tag, &ds); 3767 ASSERT(err != ENOENT); 3768 if (err != 0) 3769 return (err); 3770 3771 if (first_obj == 0) 3772 first_obj = dsl_dir_phys(ds->ds_dir)->dd_origin_obj; 3773 3774 snap = kmem_alloc(sizeof (*snap), KM_SLEEP); 3775 snap->ds = ds; 3776 list_insert_tail(l, snap); 3777 obj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 3778 } 3779 3780 return (0); 3781 } 3782 3783 static int 3784 snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep) 3785 { 3786 struct promotenode *snap; 3787 3788 *spacep = 0; 3789 for (snap = list_head(l); snap; snap = list_next(l, snap)) { 3790 uint64_t used, comp, uncomp; 3791 dsl_deadlist_space_range(&snap->ds->ds_deadlist, 3792 mintxg, UINT64_MAX, &used, &comp, &uncomp); 3793 *spacep += used; 3794 } 3795 return (0); 3796 } 3797 3798 static void 3799 snaplist_destroy(list_t *l, void *tag) 3800 { 3801 struct promotenode *snap; 3802 3803 if (l == NULL || !list_link_active(&l->list_head)) 3804 return; 3805 3806 while ((snap = list_tail(l)) != NULL) { 3807 list_remove(l, snap); 3808 dsl_dataset_rele(snap->ds, tag); 3809 kmem_free(snap, sizeof (*snap)); 3810 } 3811 list_destroy(l); 3812 } 3813 3814 static int 3815 promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp, void *tag) 3816 { 3817 int error; 3818 dsl_dir_t *dd; 3819 struct promotenode *snap; 3820 3821 error = dsl_dataset_hold(dp, ddpa->ddpa_clonename, tag, 3822 &ddpa->ddpa_clone); 3823 if (error != 0) 3824 return (error); 3825 dd = ddpa->ddpa_clone->ds_dir; 3826 3827 if (ddpa->ddpa_clone->ds_is_snapshot || 3828 !dsl_dir_is_clone(dd)) { 3829 dsl_dataset_rele(ddpa->ddpa_clone, tag); 3830 return (SET_ERROR(EINVAL)); 3831 } 3832 3833 error = snaplist_make(dp, 0, dsl_dir_phys(dd)->dd_origin_obj, 3834 &ddpa->shared_snaps, tag); 3835 if (error != 0) 3836 goto out; 3837 3838 error = snaplist_make(dp, 0, ddpa->ddpa_clone->ds_object, 3839 &ddpa->clone_snaps, tag); 3840 if (error != 0) 3841 goto out; 3842 3843 snap = list_head(&ddpa->shared_snaps); 3844 ASSERT3U(snap->ds->ds_object, ==, dsl_dir_phys(dd)->dd_origin_obj); 3845 error = snaplist_make(dp, dsl_dir_phys(dd)->dd_origin_obj, 3846 dsl_dir_phys(snap->ds->ds_dir)->dd_head_dataset_obj, 3847 &ddpa->origin_snaps, tag); 3848 if (error != 0) 3849 goto out; 3850 3851 if (dsl_dir_phys(snap->ds->ds_dir)->dd_origin_obj != 0) { 3852 error = dsl_dataset_hold_obj(dp, 3853 dsl_dir_phys(snap->ds->ds_dir)->dd_origin_obj, 3854 tag, &ddpa->origin_origin); 3855 if (error != 0) 3856 goto out; 3857 } 3858 out: 3859 if (error != 0) 3860 promote_rele(ddpa, tag); 3861 return (error); 3862 } 3863 3864 static void 3865 promote_rele(dsl_dataset_promote_arg_t *ddpa, void *tag) 3866 { 3867 snaplist_destroy(&ddpa->shared_snaps, tag); 3868 snaplist_destroy(&ddpa->clone_snaps, tag); 3869 snaplist_destroy(&ddpa->origin_snaps, tag); 3870 if (ddpa->origin_origin != NULL) 3871 dsl_dataset_rele(ddpa->origin_origin, tag); 3872 dsl_dataset_rele(ddpa->ddpa_clone, tag); 3873 } 3874 3875 /* 3876 * Promote a clone. 3877 * 3878 * If it fails due to a conflicting snapshot name, "conflsnap" will be filled 3879 * in with the name. (It must be at least ZFS_MAX_DATASET_NAME_LEN bytes long.) 3880 */ 3881 int 3882 dsl_dataset_promote(const char *name, char *conflsnap) 3883 { 3884 dsl_dataset_promote_arg_t ddpa = { 0 }; 3885 uint64_t numsnaps; 3886 int error; 3887 nvpair_t *snap_pair; 3888 objset_t *os; 3889 3890 /* 3891 * We will modify space proportional to the number of 3892 * snapshots. Compute numsnaps. 3893 */ 3894 error = dmu_objset_hold(name, FTAG, &os); 3895 if (error != 0) 3896 return (error); 3897 error = zap_count(dmu_objset_pool(os)->dp_meta_objset, 3898 dsl_dataset_phys(dmu_objset_ds(os))->ds_snapnames_zapobj, 3899 &numsnaps); 3900 dmu_objset_rele(os, FTAG); 3901 if (error != 0) 3902 return (error); 3903 3904 ddpa.ddpa_clonename = name; 3905 ddpa.err_ds = fnvlist_alloc(); 3906 ddpa.cr = CRED(); 3907 ddpa.proc = curproc; 3908 3909 error = dsl_sync_task(name, dsl_dataset_promote_check, 3910 dsl_dataset_promote_sync, &ddpa, 3911 2 + numsnaps, ZFS_SPACE_CHECK_RESERVED); 3912 3913 /* 3914 * Return the first conflicting snapshot found. 3915 */ 3916 snap_pair = nvlist_next_nvpair(ddpa.err_ds, NULL); 3917 if (snap_pair != NULL && conflsnap != NULL) 3918 (void) strlcpy(conflsnap, nvpair_name(snap_pair), 3919 ZFS_MAX_DATASET_NAME_LEN); 3920 3921 fnvlist_free(ddpa.err_ds); 3922 return (error); 3923 } 3924 3925 int 3926 dsl_dataset_clone_swap_check_impl(dsl_dataset_t *clone, 3927 dsl_dataset_t *origin_head, boolean_t force, void *owner, dmu_tx_t *tx) 3928 { 3929 /* 3930 * "slack" factor for received datasets with refquota set on them. 3931 * See the bottom of this function for details on its use. 3932 */ 3933 uint64_t refquota_slack = (uint64_t)DMU_MAX_ACCESS * 3934 spa_asize_inflation; 3935 int64_t unused_refres_delta; 3936 3937 /* they should both be heads */ 3938 if (clone->ds_is_snapshot || 3939 origin_head->ds_is_snapshot) 3940 return (SET_ERROR(EINVAL)); 3941 3942 /* if we are not forcing, the branch point should be just before them */ 3943 if (!force && clone->ds_prev != origin_head->ds_prev) 3944 return (SET_ERROR(EINVAL)); 3945 3946 /* clone should be the clone (unless they are unrelated) */ 3947 if (clone->ds_prev != NULL && 3948 clone->ds_prev != clone->ds_dir->dd_pool->dp_origin_snap && 3949 origin_head->ds_dir != clone->ds_prev->ds_dir) 3950 return (SET_ERROR(EINVAL)); 3951 3952 /* the clone should be a child of the origin */ 3953 if (clone->ds_dir->dd_parent != origin_head->ds_dir) 3954 return (SET_ERROR(EINVAL)); 3955 3956 /* origin_head shouldn't be modified unless 'force' */ 3957 if (!force && 3958 dsl_dataset_modified_since_snap(origin_head, origin_head->ds_prev)) 3959 return (SET_ERROR(ETXTBSY)); 3960 3961 /* origin_head should have no long holds (e.g. is not mounted) */ 3962 if (dsl_dataset_handoff_check(origin_head, owner, tx)) 3963 return (SET_ERROR(EBUSY)); 3964 3965 /* check amount of any unconsumed refreservation */ 3966 unused_refres_delta = 3967 (int64_t)MIN(origin_head->ds_reserved, 3968 dsl_dataset_phys(origin_head)->ds_unique_bytes) - 3969 (int64_t)MIN(origin_head->ds_reserved, 3970 dsl_dataset_phys(clone)->ds_unique_bytes); 3971 3972 if (unused_refres_delta > 0 && 3973 unused_refres_delta > 3974 dsl_dir_space_available(origin_head->ds_dir, NULL, 0, TRUE)) 3975 return (SET_ERROR(ENOSPC)); 3976 3977 /* 3978 * The clone can't be too much over the head's refquota. 3979 * 3980 * To ensure that the entire refquota can be used, we allow one 3981 * transaction to exceed the refquota. Therefore, this check 3982 * needs to also allow for the space referenced to be more than the 3983 * refquota. The maximum amount of space that one transaction can use 3984 * on disk is DMU_MAX_ACCESS * spa_asize_inflation. Allowing this 3985 * overage ensures that we are able to receive a filesystem that 3986 * exceeds the refquota on the source system. 3987 * 3988 * So that overage is the refquota_slack we use below. 3989 */ 3990 if (origin_head->ds_quota != 0 && 3991 dsl_dataset_phys(clone)->ds_referenced_bytes > 3992 origin_head->ds_quota + refquota_slack) 3993 return (SET_ERROR(EDQUOT)); 3994 3995 return (0); 3996 } 3997 3998 static void 3999 dsl_dataset_swap_remap_deadlists(dsl_dataset_t *clone, 4000 dsl_dataset_t *origin, dmu_tx_t *tx) 4001 { 4002 uint64_t clone_remap_dl_obj, origin_remap_dl_obj; 4003 dsl_pool_t *dp = dmu_tx_pool(tx); 4004 4005 ASSERT(dsl_pool_sync_context(dp)); 4006 4007 clone_remap_dl_obj = dsl_dataset_get_remap_deadlist_object(clone); 4008 origin_remap_dl_obj = dsl_dataset_get_remap_deadlist_object(origin); 4009 4010 if (clone_remap_dl_obj != 0) { 4011 dsl_deadlist_close(&clone->ds_remap_deadlist); 4012 dsl_dataset_unset_remap_deadlist_object(clone, tx); 4013 } 4014 if (origin_remap_dl_obj != 0) { 4015 dsl_deadlist_close(&origin->ds_remap_deadlist); 4016 dsl_dataset_unset_remap_deadlist_object(origin, tx); 4017 } 4018 4019 if (clone_remap_dl_obj != 0) { 4020 dsl_dataset_set_remap_deadlist_object(origin, 4021 clone_remap_dl_obj, tx); 4022 dsl_deadlist_open(&origin->ds_remap_deadlist, 4023 dp->dp_meta_objset, clone_remap_dl_obj); 4024 } 4025 if (origin_remap_dl_obj != 0) { 4026 dsl_dataset_set_remap_deadlist_object(clone, 4027 origin_remap_dl_obj, tx); 4028 dsl_deadlist_open(&clone->ds_remap_deadlist, 4029 dp->dp_meta_objset, origin_remap_dl_obj); 4030 } 4031 } 4032 4033 void 4034 dsl_dataset_clone_swap_sync_impl(dsl_dataset_t *clone, 4035 dsl_dataset_t *origin_head, dmu_tx_t *tx) 4036 { 4037 dsl_pool_t *dp = dmu_tx_pool(tx); 4038 int64_t unused_refres_delta; 4039 4040 ASSERT(clone->ds_reserved == 0); 4041 /* 4042 * NOTE: On DEBUG kernels there could be a race between this and 4043 * the check function if spa_asize_inflation is adjusted... 4044 */ 4045 ASSERT(origin_head->ds_quota == 0 || 4046 dsl_dataset_phys(clone)->ds_unique_bytes <= origin_head->ds_quota + 4047 DMU_MAX_ACCESS * spa_asize_inflation); 4048 ASSERT3P(clone->ds_prev, ==, origin_head->ds_prev); 4049 4050 dsl_dir_cancel_waiters(origin_head->ds_dir); 4051 4052 /* 4053 * Swap per-dataset feature flags. 4054 */ 4055 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 4056 if (!(spa_feature_table[f].fi_flags & 4057 ZFEATURE_FLAG_PER_DATASET)) { 4058 ASSERT(!dsl_dataset_feature_is_active(clone, f)); 4059 ASSERT(!dsl_dataset_feature_is_active(origin_head, f)); 4060 continue; 4061 } 4062 4063 boolean_t clone_inuse = dsl_dataset_feature_is_active(clone, f); 4064 void *clone_feature = clone->ds_feature[f]; 4065 boolean_t origin_head_inuse = 4066 dsl_dataset_feature_is_active(origin_head, f); 4067 void *origin_head_feature = origin_head->ds_feature[f]; 4068 4069 if (clone_inuse) 4070 dsl_dataset_deactivate_feature_impl(clone, f, tx); 4071 if (origin_head_inuse) 4072 dsl_dataset_deactivate_feature_impl(origin_head, f, tx); 4073 4074 if (clone_inuse) { 4075 dsl_dataset_activate_feature(origin_head->ds_object, f, 4076 clone_feature, tx); 4077 origin_head->ds_feature[f] = clone_feature; 4078 } 4079 if (origin_head_inuse) { 4080 dsl_dataset_activate_feature(clone->ds_object, f, 4081 origin_head_feature, tx); 4082 clone->ds_feature[f] = origin_head_feature; 4083 } 4084 } 4085 4086 dmu_buf_will_dirty(clone->ds_dbuf, tx); 4087 dmu_buf_will_dirty(origin_head->ds_dbuf, tx); 4088 4089 if (clone->ds_objset != NULL) { 4090 dmu_objset_evict(clone->ds_objset); 4091 clone->ds_objset = NULL; 4092 } 4093 4094 if (origin_head->ds_objset != NULL) { 4095 dmu_objset_evict(origin_head->ds_objset); 4096 origin_head->ds_objset = NULL; 4097 } 4098 4099 unused_refres_delta = 4100 (int64_t)MIN(origin_head->ds_reserved, 4101 dsl_dataset_phys(origin_head)->ds_unique_bytes) - 4102 (int64_t)MIN(origin_head->ds_reserved, 4103 dsl_dataset_phys(clone)->ds_unique_bytes); 4104 4105 /* 4106 * Reset origin's unique bytes. 4107 */ 4108 { 4109 dsl_dataset_t *origin = clone->ds_prev; 4110 uint64_t comp, uncomp; 4111 4112 dmu_buf_will_dirty(origin->ds_dbuf, tx); 4113 dsl_deadlist_space_range(&clone->ds_deadlist, 4114 dsl_dataset_phys(origin)->ds_prev_snap_txg, UINT64_MAX, 4115 &dsl_dataset_phys(origin)->ds_unique_bytes, &comp, &uncomp); 4116 } 4117 4118 /* swap blkptrs */ 4119 { 4120 rrw_enter(&clone->ds_bp_rwlock, RW_WRITER, FTAG); 4121 rrw_enter(&origin_head->ds_bp_rwlock, RW_WRITER, FTAG); 4122 blkptr_t tmp; 4123 tmp = dsl_dataset_phys(origin_head)->ds_bp; 4124 dsl_dataset_phys(origin_head)->ds_bp = 4125 dsl_dataset_phys(clone)->ds_bp; 4126 dsl_dataset_phys(clone)->ds_bp = tmp; 4127 rrw_exit(&origin_head->ds_bp_rwlock, FTAG); 4128 rrw_exit(&clone->ds_bp_rwlock, FTAG); 4129 } 4130 4131 /* set dd_*_bytes */ 4132 { 4133 int64_t dused, dcomp, duncomp; 4134 uint64_t cdl_used, cdl_comp, cdl_uncomp; 4135 uint64_t odl_used, odl_comp, odl_uncomp; 4136 4137 ASSERT3U(dsl_dir_phys(clone->ds_dir)-> 4138 dd_used_breakdown[DD_USED_SNAP], ==, 0); 4139 4140 dsl_deadlist_space(&clone->ds_deadlist, 4141 &cdl_used, &cdl_comp, &cdl_uncomp); 4142 dsl_deadlist_space(&origin_head->ds_deadlist, 4143 &odl_used, &odl_comp, &odl_uncomp); 4144 4145 dused = dsl_dataset_phys(clone)->ds_referenced_bytes + 4146 cdl_used - 4147 (dsl_dataset_phys(origin_head)->ds_referenced_bytes + 4148 odl_used); 4149 dcomp = dsl_dataset_phys(clone)->ds_compressed_bytes + 4150 cdl_comp - 4151 (dsl_dataset_phys(origin_head)->ds_compressed_bytes + 4152 odl_comp); 4153 duncomp = dsl_dataset_phys(clone)->ds_uncompressed_bytes + 4154 cdl_uncomp - 4155 (dsl_dataset_phys(origin_head)->ds_uncompressed_bytes + 4156 odl_uncomp); 4157 4158 dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_HEAD, 4159 dused, dcomp, duncomp, tx); 4160 dsl_dir_diduse_space(clone->ds_dir, DD_USED_HEAD, 4161 -dused, -dcomp, -duncomp, tx); 4162 4163 /* 4164 * The difference in the space used by snapshots is the 4165 * difference in snapshot space due to the head's 4166 * deadlist (since that's the only thing that's 4167 * changing that affects the snapused). 4168 */ 4169 dsl_deadlist_space_range(&clone->ds_deadlist, 4170 origin_head->ds_dir->dd_origin_txg, UINT64_MAX, 4171 &cdl_used, &cdl_comp, &cdl_uncomp); 4172 dsl_deadlist_space_range(&origin_head->ds_deadlist, 4173 origin_head->ds_dir->dd_origin_txg, UINT64_MAX, 4174 &odl_used, &odl_comp, &odl_uncomp); 4175 dsl_dir_transfer_space(origin_head->ds_dir, cdl_used - odl_used, 4176 DD_USED_HEAD, DD_USED_SNAP, tx); 4177 } 4178 4179 /* swap ds_*_bytes */ 4180 SWITCH64(dsl_dataset_phys(origin_head)->ds_referenced_bytes, 4181 dsl_dataset_phys(clone)->ds_referenced_bytes); 4182 SWITCH64(dsl_dataset_phys(origin_head)->ds_compressed_bytes, 4183 dsl_dataset_phys(clone)->ds_compressed_bytes); 4184 SWITCH64(dsl_dataset_phys(origin_head)->ds_uncompressed_bytes, 4185 dsl_dataset_phys(clone)->ds_uncompressed_bytes); 4186 SWITCH64(dsl_dataset_phys(origin_head)->ds_unique_bytes, 4187 dsl_dataset_phys(clone)->ds_unique_bytes); 4188 4189 /* apply any parent delta for change in unconsumed refreservation */ 4190 dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_REFRSRV, 4191 unused_refres_delta, 0, 0, tx); 4192 4193 /* 4194 * Swap deadlists. 4195 */ 4196 dsl_deadlist_close(&clone->ds_deadlist); 4197 dsl_deadlist_close(&origin_head->ds_deadlist); 4198 SWITCH64(dsl_dataset_phys(origin_head)->ds_deadlist_obj, 4199 dsl_dataset_phys(clone)->ds_deadlist_obj); 4200 dsl_deadlist_open(&clone->ds_deadlist, dp->dp_meta_objset, 4201 dsl_dataset_phys(clone)->ds_deadlist_obj); 4202 dsl_deadlist_open(&origin_head->ds_deadlist, dp->dp_meta_objset, 4203 dsl_dataset_phys(origin_head)->ds_deadlist_obj); 4204 dsl_dataset_swap_remap_deadlists(clone, origin_head, tx); 4205 4206 /* 4207 * If there is a bookmark at the origin, its "next dataset" is 4208 * changing, so we need to reset its FBN. 4209 */ 4210 dsl_bookmark_next_changed(origin_head, origin_head->ds_prev, tx); 4211 4212 dsl_scan_ds_clone_swapped(origin_head, clone, tx); 4213 4214 /* 4215 * Destroy any livelists associated with the clone or the origin, 4216 * since after the swap the corresponding livelists are no longer 4217 * valid. 4218 */ 4219 dsl_dir_remove_livelist(clone->ds_dir, tx, B_TRUE); 4220 dsl_dir_remove_livelist(origin_head->ds_dir, tx, B_TRUE); 4221 4222 spa_history_log_internal_ds(clone, "clone swap", tx, 4223 "parent=%s", origin_head->ds_dir->dd_myname); 4224 } 4225 4226 /* 4227 * Given a pool name and a dataset object number in that pool, 4228 * return the name of that dataset. 4229 */ 4230 int 4231 dsl_dsobj_to_dsname(char *pname, uint64_t obj, char *buf) 4232 { 4233 dsl_pool_t *dp; 4234 dsl_dataset_t *ds; 4235 int error; 4236 4237 error = dsl_pool_hold(pname, FTAG, &dp); 4238 if (error != 0) 4239 return (error); 4240 4241 error = dsl_dataset_hold_obj(dp, obj, FTAG, &ds); 4242 if (error == 0) { 4243 dsl_dataset_name(ds, buf); 4244 dsl_dataset_rele(ds, FTAG); 4245 } 4246 dsl_pool_rele(dp, FTAG); 4247 4248 return (error); 4249 } 4250 4251 int 4252 dsl_dataset_check_quota(dsl_dataset_t *ds, boolean_t check_quota, 4253 uint64_t asize, uint64_t inflight, uint64_t *used, uint64_t *ref_rsrv) 4254 { 4255 int error = 0; 4256 4257 ASSERT3S(asize, >, 0); 4258 4259 /* 4260 * *ref_rsrv is the portion of asize that will come from any 4261 * unconsumed refreservation space. 4262 */ 4263 *ref_rsrv = 0; 4264 4265 mutex_enter(&ds->ds_lock); 4266 /* 4267 * Make a space adjustment for reserved bytes. 4268 */ 4269 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes) { 4270 ASSERT3U(*used, >=, 4271 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes); 4272 *used -= 4273 (ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes); 4274 *ref_rsrv = 4275 asize - MIN(asize, parent_delta(ds, asize + inflight)); 4276 } 4277 4278 if (!check_quota || ds->ds_quota == 0) { 4279 mutex_exit(&ds->ds_lock); 4280 return (0); 4281 } 4282 /* 4283 * If they are requesting more space, and our current estimate 4284 * is over quota, they get to try again unless the actual 4285 * on-disk is over quota and there are no pending changes (which 4286 * may free up space for us). 4287 */ 4288 if (dsl_dataset_phys(ds)->ds_referenced_bytes + inflight >= 4289 ds->ds_quota) { 4290 if (inflight > 0 || 4291 dsl_dataset_phys(ds)->ds_referenced_bytes < ds->ds_quota) 4292 error = SET_ERROR(ERESTART); 4293 else 4294 error = SET_ERROR(EDQUOT); 4295 } 4296 mutex_exit(&ds->ds_lock); 4297 4298 return (error); 4299 } 4300 4301 typedef struct dsl_dataset_set_qr_arg { 4302 const char *ddsqra_name; 4303 zprop_source_t ddsqra_source; 4304 uint64_t ddsqra_value; 4305 } dsl_dataset_set_qr_arg_t; 4306 4307 4308 /* ARGSUSED */ 4309 static int 4310 dsl_dataset_set_refquota_check(void *arg, dmu_tx_t *tx) 4311 { 4312 dsl_dataset_set_qr_arg_t *ddsqra = arg; 4313 dsl_pool_t *dp = dmu_tx_pool(tx); 4314 dsl_dataset_t *ds; 4315 int error; 4316 uint64_t newval; 4317 4318 if (spa_version(dp->dp_spa) < SPA_VERSION_REFQUOTA) 4319 return (SET_ERROR(ENOTSUP)); 4320 4321 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds); 4322 if (error != 0) 4323 return (error); 4324 4325 if (ds->ds_is_snapshot) { 4326 dsl_dataset_rele(ds, FTAG); 4327 return (SET_ERROR(EINVAL)); 4328 } 4329 4330 error = dsl_prop_predict(ds->ds_dir, 4331 zfs_prop_to_name(ZFS_PROP_REFQUOTA), 4332 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval); 4333 if (error != 0) { 4334 dsl_dataset_rele(ds, FTAG); 4335 return (error); 4336 } 4337 4338 if (newval == 0) { 4339 dsl_dataset_rele(ds, FTAG); 4340 return (0); 4341 } 4342 4343 if (newval < dsl_dataset_phys(ds)->ds_referenced_bytes || 4344 newval < ds->ds_reserved) { 4345 dsl_dataset_rele(ds, FTAG); 4346 return (SET_ERROR(ENOSPC)); 4347 } 4348 4349 dsl_dataset_rele(ds, FTAG); 4350 return (0); 4351 } 4352 4353 static void 4354 dsl_dataset_set_refquota_sync(void *arg, dmu_tx_t *tx) 4355 { 4356 dsl_dataset_set_qr_arg_t *ddsqra = arg; 4357 dsl_pool_t *dp = dmu_tx_pool(tx); 4358 dsl_dataset_t *ds = NULL; 4359 uint64_t newval; 4360 4361 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds)); 4362 4363 dsl_prop_set_sync_impl(ds, 4364 zfs_prop_to_name(ZFS_PROP_REFQUOTA), 4365 ddsqra->ddsqra_source, sizeof (ddsqra->ddsqra_value), 1, 4366 &ddsqra->ddsqra_value, tx); 4367 4368 VERIFY0(dsl_prop_get_int_ds(ds, 4369 zfs_prop_to_name(ZFS_PROP_REFQUOTA), &newval)); 4370 4371 if (ds->ds_quota != newval) { 4372 dmu_buf_will_dirty(ds->ds_dbuf, tx); 4373 ds->ds_quota = newval; 4374 } 4375 dsl_dataset_rele(ds, FTAG); 4376 } 4377 4378 int 4379 dsl_dataset_set_refquota(const char *dsname, zprop_source_t source, 4380 uint64_t refquota) 4381 { 4382 dsl_dataset_set_qr_arg_t ddsqra; 4383 4384 ddsqra.ddsqra_name = dsname; 4385 ddsqra.ddsqra_source = source; 4386 ddsqra.ddsqra_value = refquota; 4387 4388 return (dsl_sync_task(dsname, dsl_dataset_set_refquota_check, 4389 dsl_dataset_set_refquota_sync, &ddsqra, 0, 4390 ZFS_SPACE_CHECK_EXTRA_RESERVED)); 4391 } 4392 4393 static int 4394 dsl_dataset_set_refreservation_check(void *arg, dmu_tx_t *tx) 4395 { 4396 dsl_dataset_set_qr_arg_t *ddsqra = arg; 4397 dsl_pool_t *dp = dmu_tx_pool(tx); 4398 dsl_dataset_t *ds; 4399 int error; 4400 uint64_t newval, unique; 4401 4402 if (spa_version(dp->dp_spa) < SPA_VERSION_REFRESERVATION) 4403 return (SET_ERROR(ENOTSUP)); 4404 4405 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds); 4406 if (error != 0) 4407 return (error); 4408 4409 if (ds->ds_is_snapshot) { 4410 dsl_dataset_rele(ds, FTAG); 4411 return (SET_ERROR(EINVAL)); 4412 } 4413 4414 error = dsl_prop_predict(ds->ds_dir, 4415 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 4416 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval); 4417 if (error != 0) { 4418 dsl_dataset_rele(ds, FTAG); 4419 return (error); 4420 } 4421 4422 /* 4423 * If we are doing the preliminary check in open context, the 4424 * space estimates may be inaccurate. 4425 */ 4426 if (!dmu_tx_is_syncing(tx)) { 4427 dsl_dataset_rele(ds, FTAG); 4428 return (0); 4429 } 4430 4431 mutex_enter(&ds->ds_lock); 4432 if (!DS_UNIQUE_IS_ACCURATE(ds)) 4433 dsl_dataset_recalc_head_uniq(ds); 4434 unique = dsl_dataset_phys(ds)->ds_unique_bytes; 4435 mutex_exit(&ds->ds_lock); 4436 4437 if (MAX(unique, newval) > MAX(unique, ds->ds_reserved)) { 4438 uint64_t delta = MAX(unique, newval) - 4439 MAX(unique, ds->ds_reserved); 4440 4441 if (delta > 4442 dsl_dir_space_available(ds->ds_dir, NULL, 0, B_TRUE) || 4443 (ds->ds_quota > 0 && newval > ds->ds_quota)) { 4444 dsl_dataset_rele(ds, FTAG); 4445 return (SET_ERROR(ENOSPC)); 4446 } 4447 } 4448 4449 dsl_dataset_rele(ds, FTAG); 4450 return (0); 4451 } 4452 4453 void 4454 dsl_dataset_set_refreservation_sync_impl(dsl_dataset_t *ds, 4455 zprop_source_t source, uint64_t value, dmu_tx_t *tx) 4456 { 4457 uint64_t newval; 4458 uint64_t unique; 4459 int64_t delta; 4460 4461 dsl_prop_set_sync_impl(ds, zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 4462 source, sizeof (value), 1, &value, tx); 4463 4464 VERIFY0(dsl_prop_get_int_ds(ds, 4465 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), &newval)); 4466 4467 dmu_buf_will_dirty(ds->ds_dbuf, tx); 4468 mutex_enter(&ds->ds_dir->dd_lock); 4469 mutex_enter(&ds->ds_lock); 4470 ASSERT(DS_UNIQUE_IS_ACCURATE(ds)); 4471 unique = dsl_dataset_phys(ds)->ds_unique_bytes; 4472 delta = MAX(0, (int64_t)(newval - unique)) - 4473 MAX(0, (int64_t)(ds->ds_reserved - unique)); 4474 ds->ds_reserved = newval; 4475 mutex_exit(&ds->ds_lock); 4476 4477 dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV, delta, 0, 0, tx); 4478 mutex_exit(&ds->ds_dir->dd_lock); 4479 } 4480 4481 static void 4482 dsl_dataset_set_refreservation_sync(void *arg, dmu_tx_t *tx) 4483 { 4484 dsl_dataset_set_qr_arg_t *ddsqra = arg; 4485 dsl_pool_t *dp = dmu_tx_pool(tx); 4486 dsl_dataset_t *ds = NULL; 4487 4488 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds)); 4489 dsl_dataset_set_refreservation_sync_impl(ds, 4490 ddsqra->ddsqra_source, ddsqra->ddsqra_value, tx); 4491 dsl_dataset_rele(ds, FTAG); 4492 } 4493 4494 int 4495 dsl_dataset_set_refreservation(const char *dsname, zprop_source_t source, 4496 uint64_t refreservation) 4497 { 4498 dsl_dataset_set_qr_arg_t ddsqra; 4499 4500 ddsqra.ddsqra_name = dsname; 4501 ddsqra.ddsqra_source = source; 4502 ddsqra.ddsqra_value = refreservation; 4503 4504 return (dsl_sync_task(dsname, dsl_dataset_set_refreservation_check, 4505 dsl_dataset_set_refreservation_sync, &ddsqra, 0, 4506 ZFS_SPACE_CHECK_EXTRA_RESERVED)); 4507 } 4508 4509 typedef struct dsl_dataset_set_compression_arg { 4510 const char *ddsca_name; 4511 zprop_source_t ddsca_source; 4512 uint64_t ddsca_value; 4513 } dsl_dataset_set_compression_arg_t; 4514 4515 /* ARGSUSED */ 4516 static int 4517 dsl_dataset_set_compression_check(void *arg, dmu_tx_t *tx) 4518 { 4519 dsl_dataset_set_compression_arg_t *ddsca = arg; 4520 dsl_pool_t *dp = dmu_tx_pool(tx); 4521 4522 uint64_t compval = ZIO_COMPRESS_ALGO(ddsca->ddsca_value); 4523 spa_feature_t f = zio_compress_to_feature(compval); 4524 4525 if (f == SPA_FEATURE_NONE) 4526 return (SET_ERROR(EINVAL)); 4527 4528 if (!spa_feature_is_enabled(dp->dp_spa, f)) 4529 return (SET_ERROR(ENOTSUP)); 4530 4531 return (0); 4532 } 4533 4534 static void 4535 dsl_dataset_set_compression_sync(void *arg, dmu_tx_t *tx) 4536 { 4537 dsl_dataset_set_compression_arg_t *ddsca = arg; 4538 dsl_pool_t *dp = dmu_tx_pool(tx); 4539 dsl_dataset_t *ds = NULL; 4540 4541 uint64_t compval = ZIO_COMPRESS_ALGO(ddsca->ddsca_value); 4542 spa_feature_t f = zio_compress_to_feature(compval); 4543 ASSERT3S(spa_feature_table[f].fi_type, ==, ZFEATURE_TYPE_BOOLEAN); 4544 4545 VERIFY0(dsl_dataset_hold(dp, ddsca->ddsca_name, FTAG, &ds)); 4546 if (zfeature_active(f, ds->ds_feature[f]) != B_TRUE) { 4547 ds->ds_feature_activation[f] = (void *)B_TRUE; 4548 dsl_dataset_activate_feature(ds->ds_object, f, 4549 ds->ds_feature_activation[f], tx); 4550 ds->ds_feature[f] = ds->ds_feature_activation[f]; 4551 } 4552 dsl_dataset_rele(ds, FTAG); 4553 } 4554 4555 int 4556 dsl_dataset_set_compression(const char *dsname, zprop_source_t source, 4557 uint64_t compression) 4558 { 4559 dsl_dataset_set_compression_arg_t ddsca; 4560 4561 /* 4562 * The sync task is only required for zstd in order to activate 4563 * the feature flag when the property is first set. 4564 */ 4565 if (ZIO_COMPRESS_ALGO(compression) != ZIO_COMPRESS_ZSTD) 4566 return (0); 4567 4568 ddsca.ddsca_name = dsname; 4569 ddsca.ddsca_source = source; 4570 ddsca.ddsca_value = compression; 4571 4572 return (dsl_sync_task(dsname, dsl_dataset_set_compression_check, 4573 dsl_dataset_set_compression_sync, &ddsca, 0, 4574 ZFS_SPACE_CHECK_EXTRA_RESERVED)); 4575 } 4576 4577 /* 4578 * Return (in *usedp) the amount of space referenced by "new" that was not 4579 * referenced at the time the bookmark corresponds to. "New" may be a 4580 * snapshot or a head. The bookmark must be before new, in 4581 * new's filesystem (or its origin) -- caller verifies this. 4582 * 4583 * The written space is calculated by considering two components: First, we 4584 * ignore any freed space, and calculate the written as new's used space 4585 * minus old's used space. Next, we add in the amount of space that was freed 4586 * between the two time points, thus reducing new's used space relative to 4587 * old's. Specifically, this is the space that was born before 4588 * zbm_creation_txg, and freed before new (ie. on new's deadlist or a 4589 * previous deadlist). 4590 * 4591 * space freed [---------------------] 4592 * snapshots ---O-------O--------O-------O------ 4593 * bookmark new 4594 * 4595 * Note, the bookmark's zbm_*_bytes_refd must be valid, but if the HAS_FBN 4596 * flag is not set, we will calculate the freed_before_next based on the 4597 * next snapshot's deadlist, rather than using zbm_*_freed_before_next_snap. 4598 */ 4599 static int 4600 dsl_dataset_space_written_impl(zfs_bookmark_phys_t *bmp, 4601 dsl_dataset_t *new, uint64_t *usedp, uint64_t *compp, uint64_t *uncompp) 4602 { 4603 int err = 0; 4604 dsl_pool_t *dp = new->ds_dir->dd_pool; 4605 4606 ASSERT(dsl_pool_config_held(dp)); 4607 if (dsl_dataset_is_snapshot(new)) { 4608 ASSERT3U(bmp->zbm_creation_txg, <, 4609 dsl_dataset_phys(new)->ds_creation_txg); 4610 } 4611 4612 *usedp = 0; 4613 *usedp += dsl_dataset_phys(new)->ds_referenced_bytes; 4614 *usedp -= bmp->zbm_referenced_bytes_refd; 4615 4616 *compp = 0; 4617 *compp += dsl_dataset_phys(new)->ds_compressed_bytes; 4618 *compp -= bmp->zbm_compressed_bytes_refd; 4619 4620 *uncompp = 0; 4621 *uncompp += dsl_dataset_phys(new)->ds_uncompressed_bytes; 4622 *uncompp -= bmp->zbm_uncompressed_bytes_refd; 4623 4624 dsl_dataset_t *snap = new; 4625 4626 while (dsl_dataset_phys(snap)->ds_prev_snap_txg > 4627 bmp->zbm_creation_txg) { 4628 uint64_t used, comp, uncomp; 4629 4630 dsl_deadlist_space_range(&snap->ds_deadlist, 4631 0, bmp->zbm_creation_txg, 4632 &used, &comp, &uncomp); 4633 *usedp += used; 4634 *compp += comp; 4635 *uncompp += uncomp; 4636 4637 uint64_t snapobj = dsl_dataset_phys(snap)->ds_prev_snap_obj; 4638 if (snap != new) 4639 dsl_dataset_rele(snap, FTAG); 4640 err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &snap); 4641 if (err != 0) 4642 break; 4643 } 4644 4645 /* 4646 * We might not have the FBN if we are calculating written from 4647 * a snapshot (because we didn't know the correct "next" snapshot 4648 * until now). 4649 */ 4650 if (bmp->zbm_flags & ZBM_FLAG_HAS_FBN) { 4651 *usedp += bmp->zbm_referenced_freed_before_next_snap; 4652 *compp += bmp->zbm_compressed_freed_before_next_snap; 4653 *uncompp += bmp->zbm_uncompressed_freed_before_next_snap; 4654 } else { 4655 ASSERT3U(dsl_dataset_phys(snap)->ds_prev_snap_txg, ==, 4656 bmp->zbm_creation_txg); 4657 uint64_t used, comp, uncomp; 4658 dsl_deadlist_space(&snap->ds_deadlist, &used, &comp, &uncomp); 4659 *usedp += used; 4660 *compp += comp; 4661 *uncompp += uncomp; 4662 } 4663 if (snap != new) 4664 dsl_dataset_rele(snap, FTAG); 4665 return (err); 4666 } 4667 4668 /* 4669 * Return (in *usedp) the amount of space written in new that was not 4670 * present at the time the bookmark corresponds to. New may be a 4671 * snapshot or the head. Old must be a bookmark before new, in 4672 * new's filesystem (or its origin) -- caller verifies this. 4673 */ 4674 int 4675 dsl_dataset_space_written_bookmark(zfs_bookmark_phys_t *bmp, 4676 dsl_dataset_t *new, uint64_t *usedp, uint64_t *compp, uint64_t *uncompp) 4677 { 4678 if (!(bmp->zbm_flags & ZBM_FLAG_HAS_FBN)) 4679 return (SET_ERROR(ENOTSUP)); 4680 return (dsl_dataset_space_written_impl(bmp, new, 4681 usedp, compp, uncompp)); 4682 } 4683 4684 /* 4685 * Return (in *usedp) the amount of space written in new that is not 4686 * present in oldsnap. New may be a snapshot or the head. Old must be 4687 * a snapshot before new, in new's filesystem (or its origin). If not then 4688 * fail and return EINVAL. 4689 */ 4690 int 4691 dsl_dataset_space_written(dsl_dataset_t *oldsnap, dsl_dataset_t *new, 4692 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp) 4693 { 4694 if (!dsl_dataset_is_before(new, oldsnap, 0)) 4695 return (SET_ERROR(EINVAL)); 4696 4697 zfs_bookmark_phys_t zbm = { 0 }; 4698 dsl_dataset_phys_t *dsp = dsl_dataset_phys(oldsnap); 4699 zbm.zbm_guid = dsp->ds_guid; 4700 zbm.zbm_creation_txg = dsp->ds_creation_txg; 4701 zbm.zbm_creation_time = dsp->ds_creation_time; 4702 zbm.zbm_referenced_bytes_refd = dsp->ds_referenced_bytes; 4703 zbm.zbm_compressed_bytes_refd = dsp->ds_compressed_bytes; 4704 zbm.zbm_uncompressed_bytes_refd = dsp->ds_uncompressed_bytes; 4705 4706 /* 4707 * If oldsnap is the origin (or origin's origin, ...) of new, 4708 * we can't easily calculate the effective FBN. Therefore, 4709 * we do not set ZBM_FLAG_HAS_FBN, so that the _impl will calculate 4710 * it relative to the correct "next": the next snapshot towards "new", 4711 * rather than the next snapshot in oldsnap's dsl_dir. 4712 */ 4713 return (dsl_dataset_space_written_impl(&zbm, new, 4714 usedp, compp, uncompp)); 4715 } 4716 4717 /* 4718 * Return (in *usedp) the amount of space that will be reclaimed if firstsnap, 4719 * lastsnap, and all snapshots in between are deleted. 4720 * 4721 * blocks that would be freed [---------------------------] 4722 * snapshots ---O-------O--------O-------O--------O 4723 * firstsnap lastsnap 4724 * 4725 * This is the set of blocks that were born after the snap before firstsnap, 4726 * (birth > firstsnap->prev_snap_txg) and died before the snap after the 4727 * last snap (ie, is on lastsnap->ds_next->ds_deadlist or an earlier deadlist). 4728 * We calculate this by iterating over the relevant deadlists (from the snap 4729 * after lastsnap, backward to the snap after firstsnap), summing up the 4730 * space on the deadlist that was born after the snap before firstsnap. 4731 */ 4732 int 4733 dsl_dataset_space_wouldfree(dsl_dataset_t *firstsnap, 4734 dsl_dataset_t *lastsnap, 4735 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp) 4736 { 4737 int err = 0; 4738 uint64_t snapobj; 4739 dsl_pool_t *dp = firstsnap->ds_dir->dd_pool; 4740 4741 ASSERT(firstsnap->ds_is_snapshot); 4742 ASSERT(lastsnap->ds_is_snapshot); 4743 4744 /* 4745 * Check that the snapshots are in the same dsl_dir, and firstsnap 4746 * is before lastsnap. 4747 */ 4748 if (firstsnap->ds_dir != lastsnap->ds_dir || 4749 dsl_dataset_phys(firstsnap)->ds_creation_txg > 4750 dsl_dataset_phys(lastsnap)->ds_creation_txg) 4751 return (SET_ERROR(EINVAL)); 4752 4753 *usedp = *compp = *uncompp = 0; 4754 4755 snapobj = dsl_dataset_phys(lastsnap)->ds_next_snap_obj; 4756 while (snapobj != firstsnap->ds_object) { 4757 dsl_dataset_t *ds; 4758 uint64_t used, comp, uncomp; 4759 4760 err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &ds); 4761 if (err != 0) 4762 break; 4763 4764 dsl_deadlist_space_range(&ds->ds_deadlist, 4765 dsl_dataset_phys(firstsnap)->ds_prev_snap_txg, UINT64_MAX, 4766 &used, &comp, &uncomp); 4767 *usedp += used; 4768 *compp += comp; 4769 *uncompp += uncomp; 4770 4771 snapobj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 4772 ASSERT3U(snapobj, !=, 0); 4773 dsl_dataset_rele(ds, FTAG); 4774 } 4775 return (err); 4776 } 4777 4778 /* 4779 * Return TRUE if 'earlier' is an earlier snapshot in 'later's timeline. 4780 * For example, they could both be snapshots of the same filesystem, and 4781 * 'earlier' is before 'later'. Or 'earlier' could be the origin of 4782 * 'later's filesystem. Or 'earlier' could be an older snapshot in the origin's 4783 * filesystem. Or 'earlier' could be the origin's origin. 4784 * 4785 * If non-zero, earlier_txg is used instead of earlier's ds_creation_txg. 4786 */ 4787 boolean_t 4788 dsl_dataset_is_before(dsl_dataset_t *later, dsl_dataset_t *earlier, 4789 uint64_t earlier_txg) 4790 { 4791 dsl_pool_t *dp = later->ds_dir->dd_pool; 4792 int error; 4793 boolean_t ret; 4794 4795 ASSERT(dsl_pool_config_held(dp)); 4796 ASSERT(earlier->ds_is_snapshot || earlier_txg != 0); 4797 4798 if (earlier_txg == 0) 4799 earlier_txg = dsl_dataset_phys(earlier)->ds_creation_txg; 4800 4801 if (later->ds_is_snapshot && 4802 earlier_txg >= dsl_dataset_phys(later)->ds_creation_txg) 4803 return (B_FALSE); 4804 4805 if (later->ds_dir == earlier->ds_dir) 4806 return (B_TRUE); 4807 4808 /* 4809 * We check dd_origin_obj explicitly here rather than using 4810 * dsl_dir_is_clone() so that we will return TRUE if "earlier" 4811 * is $ORIGIN@$ORIGIN. dsl_dataset_space_written() depends on 4812 * this behavior. 4813 */ 4814 if (dsl_dir_phys(later->ds_dir)->dd_origin_obj == 0) 4815 return (B_FALSE); 4816 4817 dsl_dataset_t *origin; 4818 error = dsl_dataset_hold_obj(dp, 4819 dsl_dir_phys(later->ds_dir)->dd_origin_obj, FTAG, &origin); 4820 if (error != 0) 4821 return (B_FALSE); 4822 if (dsl_dataset_phys(origin)->ds_creation_txg == earlier_txg && 4823 origin->ds_dir == earlier->ds_dir) { 4824 dsl_dataset_rele(origin, FTAG); 4825 return (B_TRUE); 4826 } 4827 ret = dsl_dataset_is_before(origin, earlier, earlier_txg); 4828 dsl_dataset_rele(origin, FTAG); 4829 return (ret); 4830 } 4831 4832 void 4833 dsl_dataset_zapify(dsl_dataset_t *ds, dmu_tx_t *tx) 4834 { 4835 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 4836 dmu_object_zapify(mos, ds->ds_object, DMU_OT_DSL_DATASET, tx); 4837 } 4838 4839 boolean_t 4840 dsl_dataset_is_zapified(dsl_dataset_t *ds) 4841 { 4842 dmu_object_info_t doi; 4843 4844 dmu_object_info_from_db(ds->ds_dbuf, &doi); 4845 return (doi.doi_type == DMU_OTN_ZAP_METADATA); 4846 } 4847 4848 boolean_t 4849 dsl_dataset_has_resume_receive_state(dsl_dataset_t *ds) 4850 { 4851 return (dsl_dataset_is_zapified(ds) && 4852 zap_contains(ds->ds_dir->dd_pool->dp_meta_objset, 4853 ds->ds_object, DS_FIELD_RESUME_TOGUID) == 0); 4854 } 4855 4856 uint64_t 4857 dsl_dataset_get_remap_deadlist_object(dsl_dataset_t *ds) 4858 { 4859 uint64_t remap_deadlist_obj; 4860 int err; 4861 4862 if (!dsl_dataset_is_zapified(ds)) 4863 return (0); 4864 4865 err = zap_lookup(ds->ds_dir->dd_pool->dp_meta_objset, ds->ds_object, 4866 DS_FIELD_REMAP_DEADLIST, sizeof (remap_deadlist_obj), 1, 4867 &remap_deadlist_obj); 4868 4869 if (err != 0) { 4870 VERIFY3S(err, ==, ENOENT); 4871 return (0); 4872 } 4873 4874 ASSERT(remap_deadlist_obj != 0); 4875 return (remap_deadlist_obj); 4876 } 4877 4878 boolean_t 4879 dsl_dataset_remap_deadlist_exists(dsl_dataset_t *ds) 4880 { 4881 EQUIV(dsl_deadlist_is_open(&ds->ds_remap_deadlist), 4882 dsl_dataset_get_remap_deadlist_object(ds) != 0); 4883 return (dsl_deadlist_is_open(&ds->ds_remap_deadlist)); 4884 } 4885 4886 static void 4887 dsl_dataset_set_remap_deadlist_object(dsl_dataset_t *ds, uint64_t obj, 4888 dmu_tx_t *tx) 4889 { 4890 ASSERT(obj != 0); 4891 dsl_dataset_zapify(ds, tx); 4892 VERIFY0(zap_add(ds->ds_dir->dd_pool->dp_meta_objset, ds->ds_object, 4893 DS_FIELD_REMAP_DEADLIST, sizeof (obj), 1, &obj, tx)); 4894 } 4895 4896 static void 4897 dsl_dataset_unset_remap_deadlist_object(dsl_dataset_t *ds, dmu_tx_t *tx) 4898 { 4899 VERIFY0(zap_remove(ds->ds_dir->dd_pool->dp_meta_objset, 4900 ds->ds_object, DS_FIELD_REMAP_DEADLIST, tx)); 4901 } 4902 4903 void 4904 dsl_dataset_destroy_remap_deadlist(dsl_dataset_t *ds, dmu_tx_t *tx) 4905 { 4906 uint64_t remap_deadlist_object; 4907 spa_t *spa = ds->ds_dir->dd_pool->dp_spa; 4908 4909 ASSERT(dmu_tx_is_syncing(tx)); 4910 ASSERT(dsl_dataset_remap_deadlist_exists(ds)); 4911 4912 remap_deadlist_object = ds->ds_remap_deadlist.dl_object; 4913 dsl_deadlist_close(&ds->ds_remap_deadlist); 4914 dsl_deadlist_free(spa_meta_objset(spa), remap_deadlist_object, tx); 4915 dsl_dataset_unset_remap_deadlist_object(ds, tx); 4916 spa_feature_decr(spa, SPA_FEATURE_OBSOLETE_COUNTS, tx); 4917 } 4918 4919 void 4920 dsl_dataset_create_remap_deadlist(dsl_dataset_t *ds, dmu_tx_t *tx) 4921 { 4922 uint64_t remap_deadlist_obj; 4923 spa_t *spa = ds->ds_dir->dd_pool->dp_spa; 4924 4925 ASSERT(dmu_tx_is_syncing(tx)); 4926 ASSERT(MUTEX_HELD(&ds->ds_remap_deadlist_lock)); 4927 /* 4928 * Currently we only create remap deadlists when there are indirect 4929 * vdevs with referenced mappings. 4930 */ 4931 ASSERT(spa_feature_is_active(spa, SPA_FEATURE_DEVICE_REMOVAL)); 4932 4933 remap_deadlist_obj = dsl_deadlist_clone( 4934 &ds->ds_deadlist, UINT64_MAX, 4935 dsl_dataset_phys(ds)->ds_prev_snap_obj, tx); 4936 dsl_dataset_set_remap_deadlist_object(ds, 4937 remap_deadlist_obj, tx); 4938 dsl_deadlist_open(&ds->ds_remap_deadlist, spa_meta_objset(spa), 4939 remap_deadlist_obj); 4940 spa_feature_incr(spa, SPA_FEATURE_OBSOLETE_COUNTS, tx); 4941 } 4942 4943 void 4944 dsl_dataset_activate_redaction(dsl_dataset_t *ds, uint64_t *redact_snaps, 4945 uint64_t num_redact_snaps, dmu_tx_t *tx) 4946 { 4947 uint64_t dsobj = ds->ds_object; 4948 struct feature_type_uint64_array_arg *ftuaa = 4949 kmem_zalloc(sizeof (*ftuaa), KM_SLEEP); 4950 ftuaa->length = (int64_t)num_redact_snaps; 4951 if (num_redact_snaps > 0) { 4952 ftuaa->array = kmem_alloc(num_redact_snaps * sizeof (uint64_t), 4953 KM_SLEEP); 4954 bcopy(redact_snaps, ftuaa->array, num_redact_snaps * 4955 sizeof (uint64_t)); 4956 } 4957 dsl_dataset_activate_feature(dsobj, SPA_FEATURE_REDACTED_DATASETS, 4958 ftuaa, tx); 4959 ds->ds_feature[SPA_FEATURE_REDACTED_DATASETS] = ftuaa; 4960 } 4961 4962 /* BEGIN CSTYLED */ 4963 #if defined(_LP64) 4964 #define RECORDSIZE_PERM ZMOD_RW 4965 #else 4966 /* Limited to 1M on 32-bit platforms due to lack of virtual address space */ 4967 #define RECORDSIZE_PERM ZMOD_RD 4968 #endif 4969 ZFS_MODULE_PARAM(zfs, zfs_, max_recordsize, INT, RECORDSIZE_PERM, 4970 "Max allowed record size"); 4971 4972 ZFS_MODULE_PARAM(zfs, zfs_, allow_redacted_dataset_mount, INT, ZMOD_RW, 4973 "Allow mounting of redacted datasets"); 4974 /* END CSTYLED */ 4975 4976 EXPORT_SYMBOL(dsl_dataset_hold); 4977 EXPORT_SYMBOL(dsl_dataset_hold_flags); 4978 EXPORT_SYMBOL(dsl_dataset_hold_obj); 4979 EXPORT_SYMBOL(dsl_dataset_hold_obj_flags); 4980 EXPORT_SYMBOL(dsl_dataset_own); 4981 EXPORT_SYMBOL(dsl_dataset_own_obj); 4982 EXPORT_SYMBOL(dsl_dataset_name); 4983 EXPORT_SYMBOL(dsl_dataset_rele); 4984 EXPORT_SYMBOL(dsl_dataset_rele_flags); 4985 EXPORT_SYMBOL(dsl_dataset_disown); 4986 EXPORT_SYMBOL(dsl_dataset_tryown); 4987 EXPORT_SYMBOL(dsl_dataset_create_sync); 4988 EXPORT_SYMBOL(dsl_dataset_create_sync_dd); 4989 EXPORT_SYMBOL(dsl_dataset_snapshot_check); 4990 EXPORT_SYMBOL(dsl_dataset_snapshot_sync); 4991 EXPORT_SYMBOL(dsl_dataset_promote); 4992 EXPORT_SYMBOL(dsl_dataset_user_hold); 4993 EXPORT_SYMBOL(dsl_dataset_user_release); 4994 EXPORT_SYMBOL(dsl_dataset_get_holds); 4995 EXPORT_SYMBOL(dsl_dataset_get_blkptr); 4996 EXPORT_SYMBOL(dsl_dataset_get_spa); 4997 EXPORT_SYMBOL(dsl_dataset_modified_since_snap); 4998 EXPORT_SYMBOL(dsl_dataset_space_written); 4999 EXPORT_SYMBOL(dsl_dataset_space_wouldfree); 5000 EXPORT_SYMBOL(dsl_dataset_sync); 5001 EXPORT_SYMBOL(dsl_dataset_block_born); 5002 EXPORT_SYMBOL(dsl_dataset_block_kill); 5003 EXPORT_SYMBOL(dsl_dataset_dirty); 5004 EXPORT_SYMBOL(dsl_dataset_stats); 5005 EXPORT_SYMBOL(dsl_dataset_fast_stat); 5006 EXPORT_SYMBOL(dsl_dataset_space); 5007 EXPORT_SYMBOL(dsl_dataset_fsid_guid); 5008 EXPORT_SYMBOL(dsl_dsobj_to_dsname); 5009 EXPORT_SYMBOL(dsl_dataset_check_quota); 5010 EXPORT_SYMBOL(dsl_dataset_clone_swap_check_impl); 5011 EXPORT_SYMBOL(dsl_dataset_clone_swap_sync_impl); 5012